#!/usr/bin/perl
# A very simple perl web server used by Webmin
# Require basic libraries
package miniserv;
use Socket;
use POSIX;
use Time::Local;
eval "use Time::HiRes;";
@itoa64 = split(//, "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
@miniserv_argv = @ARGV;
# Find and read config file
if ($ARGV[0] eq "--nofork") {
$nofork_argv = 1;
shift(@ARGV);
}
if (@ARGV != 1) {
die "Usage: miniserv.pl <config file>";
}
if ($ARGV[0] =~ /^([a-z]:)?\//i) {
$config_file = $ARGV[0];
}
else {
chop($pwd = `pwd`);
$config_file = "$pwd/$ARGV[0]";
}
%config = &read_config_file($config_file);
$ENV{'LIBROOT'} = $config{'root'};
if ($config{'perllib'}) {
push(@INC, split(/:/, $config{'perllib'}));
push(@INC, "$config{'root'}/vendor_perl");
$ENV{'PERLLIB'} .= ':'.$config{'perllib'};
$ENV{'PERLLIB'} .= ':'."$config{'root'}/vendor_perl";
}
@startup_msg = ( );
# Check if SSL is enabled and available
if ($config{'ssl'}) {
eval "use Net::SSLeay";
if (!$@) {
$use_ssl = 1;
# These functions only exist for SSLeay 1.0
eval "Net::SSLeay::SSLeay_add_ssl_algorithms()";
eval "Net::SSLeay::load_error_strings()";
if (defined(&Net::SSLeay::X509_STORE_CTX_get_current_cert) &&
defined(&Net::SSLeay::CTX_load_verify_locations) &&
(defined(&Net::SSLeay::CTX_set_verify) ||
defined(&Net::SSLeay::set_verify))) {
$client_certs = 1;
}
}
}
# Check if IPv6 is enabled and available
eval "use Socket6";
$socket6err = $@;
if ($config{'ipv6'}) {
if (!$socket6err) {
push(@startup_msg, "IPv6 support enabled");
$use_ipv6 = 1;
}
else {
push(@startup_msg, "IPv6 support cannot be enabled without ".
"the Socket6 perl module");
}
}
# Check if the syslog module is available to log hacking attempts
if ($config{'syslog'}) {
eval "use Sys::Syslog qw(:DEFAULT setlogsock)";
if (!$@) {
$use_syslog = 1;
}
}
# check if the TCP-wrappers module is available
if ($config{'libwrap'}) {
eval "use Authen::Libwrap qw(hosts_ctl STRING_UNKNOWN)";
if (!$@) {
$use_libwrap = 1;
}
}
# Check if the MD5 perl module is available
eval "use MD5; \$dummy = new MD5; \$dummy->add('foo');";
if (!$@) {
$use_md5 = "MD5";
}
else {
eval "use Digest::MD5; \$dummy = new Digest::MD5; \$dummy->add('foo');";
if (!$@) {
$use_md5 = "Digest::MD5";
}
}
if ($use_md5) {
push(@startup_msg, "Using MD5 module $use_md5");
}
# Check if the SHA512 perl module is available
eval "use Crypt::SHA";
$use_sha512 = $@ ? "Crypt::SHA" : undef;
if ($use_sha512) {
push(@startup_msg, "Using SHA512 module $use_sha512");
}
# Get miniserv's perl path and location
$miniserv_path = $0;
open(SOURCE, $miniserv_path);
<SOURCE> =~ /^#!(\S+)/;
$perl_path = $1;
close(SOURCE);
if (!-x $perl_path) {
$perl_path = $^X;
}
if (-l $perl_path) {
$linked_perl_path = readlink($perl_path);
}
# Check vital config options
&update_vital_config();
# Check if already running via the PID file
if (open(PIDFILE, $config{'pidfile'})) {
my $already = <PIDFILE>;
close(PIDFILE);
chop($already);
if ($already && $already != $$ && kill(0, $already)) {
die "Webmin is already running with PID $already\n";
}
}
$sidname = $config{'sidname'};
# check if the PAM module is available to authenticate
if ($config{'assume_pam'}) {
# Just assume that it will work. This can also be used to work around
# a Solaris bug in which using PAM before forking caused it to fail
# later!
$use_pam = 1;
}
elsif (!$config{'no_pam'}) {
eval "use Authen::PAM;";
if (!$@) {
# check if the PAM authentication can be used by opening a
# PAM handle
local $pamh;
if (ref($pamh = new Authen::PAM($config{'pam'},
$config{'pam_test_user'},
\&pam_conv_func))) {
# Now test a login to see if /etc/pam.d/webmin is set
# up properly.
$pam_conv_func_called = 0;
$pam_username = "test";
$pam_password = "test";
$pamh->pam_authenticate();
if ($pam_conv_func_called) {
push(@startup_msg,
"PAM authentication enabled");
$use_pam = 1;
}
else {
push(@startup_msg,
"PAM test failed - maybe ".
"/etc/pam.d/$config{'pam'} does not exist");
}
}
else {
push(@startup_msg,
"PAM initialization of Authen::PAM failed");
}
}
}
if ($config{'pam_only'} && !$use_pam) {
foreach $msg (@startup_msg) {
print STDERR $msg,"\n";
}
print STDERR "PAM use is mandatory, but could not be enabled!\n";
print STDERR "no_pam and pam_only both are set!\n" if ($config{no_pam});
exit(1);
}
elsif ($pam_msg && !$use_pam) {
push(@startup_msg,
"Continuing without the Authen::PAM perl module");
}
# Check if the User::Utmp perl module is installed
if ($config{'utmp'}) {
eval "use User::Utmp;";
if (!$@) {
$write_utmp = 1;
push(@startup_msg, "UTMP logging enabled");
}
else {
push(@startup_msg,
"Perl module User::Utmp needed for Utmp logging is ".
"not installed : $@");
}
}
# See if the crypt function fails
eval "crypt('foo', 'xx')";
if ($@) {
eval "use Crypt::UnixCrypt";
if (!$@) {
$use_perl_crypt = 1;
push(@startup_msg,
"Using Crypt::UnixCrypt for password encryption");
}
else {
push(@startup_msg,
"crypt() function un-implemented, and Crypt::UnixCrypt ".
"not installed - password authentication will fail");
}
}
# Check if /dev/urandom really generates random IDs, by calling it twice
local $rand1 = &generate_random_id(1);
local $rand2 = &generate_random_id(1);
if ($rand1 eq $rand2) {
$bad_urandom = 1;
push(@startup_msg,
"Random number generator file /dev/urandom is not reliable");
}
# Check if we can call sudo
if ($config{'sudo'} && &has_command("sudo")) {
eval "use IO::Pty";
if (!$@) {
$use_sudo = 1;
}
else {
push(@startup_msg,
"Perl module IO::Pty needed for calling sudo is not ".
"installed : $@");
}
}
# init days and months for http_date
@weekday = ( "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" );
@month = ( "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" );
# Change dir to the server root
@roots = ( $config{'root'} );
for($i=0; defined($config{"extraroot_$i"}); $i++) {
push(@roots, $config{"extraroot_$i"});
}
chdir($roots[0]);
eval { $user_homedir = (getpwuid($<))[7]; };
if ($@) {
# getpwuid doesn't work on windows
$user_homedir = $ENV{"HOME"} || $ENV{"USERPROFILE"} || "/";
$on_windows = 1;
}
# Read users file
&read_users_file();
# Setup SSL if possible and if requested
if (!-r $config{'keyfile'}) {
# Key file doesn't exist!
if ($config{'keyfile'}) {
print STDERR "SSL key file $config{'keyfile'} does not exist\n";
}
$use_ssl = 0;
}
elsif ($config{'certfile'} && !-r $config{'certfile'}) {
# Cert file doesn't exist!
print STDERR "SSL cert file $config{'certfile'} does not exist\n";
$use_ssl = 0;
}
if ($use_ssl) {
$client_certs = 0 if (!-r $config{'ca'} || !%certs);
$err = &setup_ssl_contexts();
die $err if ($err);
}
# Load gzip library if enabled
if ($config{'gzip'} eq '1') {
eval "use Compress::Zlib";
if (!$@) {
$use_gzip = 1;
}
}
# Read websockets configs
&parse_websockets_config();
# Setup syslog support if possible and if requested
if ($use_syslog) {
open(ERRDUP, ">&STDERR");
open(STDERR, ">/dev/null");
$log_socket = $config{"logsock"} || "unix";
eval 'openlog($config{"pam"}, "cons,pid,ndelay", "authpriv"); setlogsock($log_socket)';
if ($@) {
$use_syslog = 0;
}
else {
local $msg = ucfirst($config{'pam'});
$msg .= $ENV{'STARTED'}++ ?
" reloaded configuration" : " starting";
eval { syslog("info", "%s", $msg); };
if ($@) {
eval {
setlogsock("inet");
syslog("info", "%s", $msg);
};
if ($@) {
# All attempts to use syslog have failed..
$use_syslog = 0;
}
}
}
open(STDERR, ">&ERRDUP");
close(ERRDUP);
}
# Read MIME types file and add extra types
&read_mime_types();
# get the time zone
if ($config{'log'}) {
local(@gmt, @lct, $days, $hours, $mins);
@gmt = gmtime(time());
@lct = localtime(time());
$days = $lct[3] - $gmt[3];
$hours = ($days < -1 ? 24 : 1 < $days ? -24 : $days * 24) +
$lct[2] - $gmt[2];
$mins = $hours * 60 + $lct[1] - $gmt[1];
$timezone = ($mins < 0 ? "-" : "+"); $mins = abs($mins);
$timezone .= sprintf "%2.2d%2.2d", $mins/60, $mins%60;
}
# Build various maps from the config files
&build_config_mappings();
# start up external authentication program, if needed
if ($config{'extauth'}) {
socketpair(EXTAUTH, EXTAUTH2, AF_UNIX, SOCK_STREAM, PF_UNSPEC);
if (!($extauth = fork())) {
close(EXTAUTH);
close(STDIN);
close(STDOUT);
open(STDIN, "<&EXTAUTH2");
open(STDOUT, ">&EXTAUTH2");
exec($config{'extauth'}) or die "exec failed : $!\n";
}
close(EXTAUTH2);
local $os = select(EXTAUTH);
$| = 1; select($os);
}
# Pre-load any libraries
foreach $pl (split(/\s+/, $config{'preload'})) {
($pkg, $lib) = split(/=/, $pl);
$pkg =~ s/[^A-Za-z0-9]/_/g;
eval "package $pkg; do '$config{'root'}/$lib'";
if ($@) {
print STDERR "Failed to pre-load $lib in $pkg : $@\n";
}
}
foreach $pl (split(/\s+/, $config{'premodules'})) {
if ($pl =~ /\//) {
($dir, $mod) = split(/\//, $pl);
}
else {
($dir, $mod) = (undef, $pl);
}
push(@INC, "$config{'root'}/$dir");
eval "package $mod; use $mod ()";
if ($@) {
print STDERR "Failed to pre-load $mod : $@\n";
}
}
foreach $mod (split(/\s+/, $config{'preuse'})) {
eval "use $mod;";
if ($@) {
print STDERR "Failed to pre-load $mod : $@\n";
}
}
# Open debug log if set
if ($config{'debuglog'}) {
open(DEBUG, ">>$config{'debuglog'}");
chmod(0700, $config{'debuglog'});
select(DEBUG); $| = 1; select(STDOUT);
print DEBUG "miniserv.pl starting ..\n";
}
# Write out (empty) blocked hosts file
&write_blocked_file();
# Initially read webmin cron functions and last execution times
&read_webmin_crons();
%webmincron_last = ( );
&read_file($config{'webmincron_last'}, \%webmincron_last);
# Pre-cache lang files
&precache_files();
# Clear any flag files to prevent restart loops
unlink($config{'restartflag'}) if ($config{'restartflag'});
unlink($config{'reloadflag'}) if ($config{'reloadflag'});
unlink($config{'stopflag'}) if ($config{'stopflag'});
# Build list of sockets to listen on
@listening_on_ports = ();
$config{'bind'} = '' if ($config{'bind'} eq '*');
if ($config{'bind'}) {
# Listening on a specific IP
if (&check_ip6address($config{'bind'})) {
# IP is v6
$use_ipv6 || die "Cannot bind to $config{'bind'} without IPv6";
push(@sockets, [ inet_pton(AF_INET6(),$config{'bind'}),
$config{'port'},
PF_INET6() ]);
}
else {
# IP is v4
push(@sockets, [ inet_aton($config{'bind'}),
$config{'port'},
PF_INET() ]);
}
}
else {
# Listening on all IPs
push(@sockets, [ INADDR_ANY, $config{'port'}, PF_INET() ]);
if ($use_ipv6) {
# Also IPv6
push(@sockets, [ in6addr_any(), $config{'port'},
PF_INET6() ]);
}
}
foreach $s (split(/\s+/, $config{'sockets'})) {
if ($s =~ /^(\d+)$/) {
# Just listen on another port on the main IP
push(@sockets, [ $sockets[0]->[0], $s, $sockets[0]->[2] ]);
if ($use_ipv6 && !$config{'bind'}) {
# Also listen on that port on the main IPv6 address
push(@sockets, [ $sockets[1]->[0], $s,
$sockets[1]->[2] ]);
}
}
elsif ($s =~ /^\*:(\d+)$/) {
# Listening on all IPs on some port
push(@sockets, [ INADDR_ANY, $1,
PF_INET() ]);
if ($use_ipv6) {
push(@sockets, [ in6addr_any(), $1,
PF_INET6() ]);
}
}
elsif ($s =~ /^(\S+):(\d+)$/) {
# Listen on a specific port and IP
my ($ip, $port) = ($1, $2);
if (&check_ip6address($ip)) {
$use_ipv6 || die "Cannot bind to $ip without IPv6";
push(@sockets, [ inet_pton(AF_INET6(),
$ip),
$port, PF_INET6() ]);
}
else {
push(@sockets, [ inet_aton($ip), $port,
PF_INET() ]);
}
}
elsif ($s =~ /^([0-9\.]+):\*$/ || $s =~ /^([0-9\.]+)$/) {
# Listen on the main port on another IPv4 address
push(@sockets, [ inet_aton($1), $sockets[0]->[1],
PF_INET() ]);
}
elsif (($s =~ /^([0-9a-f\:]+):\*$/ || $s =~ /^([0-9a-f\:]+)$/) &&
$use_ipv6) {
# Listen on the main port on another IPv6 address
push(@sockets, [ inet_pton(AF_INET6(), $1),
$sockets[0]->[1],
PF_INET6() ]);
}
}
# Open all the sockets
$proto = getprotobyname('tcp');
@sockerrs = ( );
$tried_inaddr_any = 0;
for($i=0; $i<@sockets; $i++) {
$fh = "MAIN$i";
if (!socket($fh, $sockets[$i]->[2], SOCK_STREAM, $proto)) {
# Protocol not supported
push(@sockerrs, "Failed to open socket family $sockets[$i]->[2] : $!");
next;
}
setsockopt($fh, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
if ($sockets[$i]->[2] eq PF_INET()) {
$pack = pack_sockaddr_in($sockets[$i]->[1], $sockets[$i]->[0]);
}
else {
$pack = pack_sockaddr_in6($sockets[$i]->[1], $sockets[$i]->[0]);
setsockopt($fh, 41, 26, pack("l", 1)); # IPv6 only
}
for($j=0; $j<5; $j++) {
last if (bind($fh, $pack));
sleep(1);
}
if ($j == 5) {
# All attempts failed .. give up
if ($sockets[$i]->[0] eq INADDR_ANY ||
$use_ipv6 && $sockets[$i]->[0] eq in6addr_any()) {
push(@sockerrs,
"Failed to bind to port $sockets[$i]->[1] : $!");
$tried_inaddr_any = 1;
}
else {
$ip = &network_to_address($sockets[$i]->[0]);
push(@sockerrs,
"Failed to bind to IP $ip port ".
"$sockets[$i]->[1] : $!");
}
}
else {
listen($fh, &get_somaxconn());
push(@socketfhs, $fh);
push(@listening_on_ports, $sockets[$i]->[1]);
$ipv6fhs{$fh} = $sockets[$i]->[2] eq PF_INET() ? 0 : 1;
}
}
foreach $se (@sockerrs) {
print STDERR $se,"\n";
}
# If all binds failed, try binding to any address
if (!@socketfhs && !$tried_inaddr_any) {
print STDERR "Falling back to listening on any address\n";
$fh = "MAIN";
socket($fh, PF_INET(), SOCK_STREAM, $proto) ||
die "Failed to open socket : $!";
setsockopt($fh, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
if (!bind($fh, pack_sockaddr_in($sockets[0]->[1], INADDR_ANY))) {
print STDERR "Failed to bind to port $sockets[0]->[1] : $!\n";
exit(1);
}
listen($fh, &get_somaxconn());
push(@socketfhs, $fh);
}
elsif (!@socketfhs && $tried_inaddr_any) {
print STDERR "Could not listen on any ports";
exit(1);
}
if ($config{'listen'}) {
# Open the socket that allows other webmin servers to find this one
$proto = getprotobyname('udp');
if (socket(LISTEN, PF_INET(), SOCK_DGRAM, $proto)) {
setsockopt(LISTEN, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));
bind(LISTEN, pack_sockaddr_in($config{'listen'}, INADDR_ANY));
listen(LISTEN, &get_somaxconn());
}
else {
$config{'listen'} = 0;
}
}
# Split from the controlling terminal, unless configured not to
if (!$config{'nofork'} && !$nofork_argv) {
if (fork()) { exit; }
}
eval { setsid(); }; # may not work on Windows
# Close standard file handles
open(STDIN, "</dev/null");
open(STDOUT, ">/dev/null");
&redirect_stderr_to_log();
&log_error("miniserv.pl started");
foreach $msg (@startup_msg) {
&log_error($msg);
}
# write out the PID file
&write_pid_file();
$miniserv_main_pid = $$;
# Start the log-clearing process, if needed. This checks every minute
# to see if the log has passed its reset time, and if so clears it
if ($config{'logclear'}) {
if (!($logclearer = fork())) {
&close_all_sockets();
close(LISTEN);
while(1) {
local $write_logtime = 0;
local @st = stat("$config{'logfile'}.time");
if (@st) {
if ($st[9]+$config{'logtime'}*60*60 < time()){
# need to clear log
$write_logtime = 1;
unlink($config{'logfile'});
}
}
else { $write_logtime = 1; }
if ($write_logtime) {
open(LOGTIME, ">$config{'logfile'}.time");
print LOGTIME time(),"\n";
close(LOGTIME);
}
sleep(5*60);
}
exit;
}
push(@childpids, $logclearer);
}
# Setup the logout time dbm if needed
if ($config{'session'}) {
eval "use SDBM_File";
dbmopen(%sessiondb, $config{'sessiondb'}, 0700);
eval "\$sessiondb{'1111111111'} = 'foo bar';";
if ($@) {
dbmclose(%sessiondb);
eval "use NDBM_File";
dbmopen(%sessiondb, $config{'sessiondb'}, 0700);
}
else {
delete($sessiondb{'1111111111'});
}
}
# Run the main loop
$SIG{'HUP'} = 'miniserv::trigger_restart';
$SIG{'TERM'} = 'miniserv::term_handler';
$SIG{'USR1'} = 'miniserv::trigger_reload';
$SIG{'PIPE'} = 'IGNORE';
local $remove_session_count = 0;
$need_pipes = $config{'passdelay'} || $config{'session'};
$cron_runs = 0;
while(1) {
# Check if any webmin cron jobs are ready to run
&execute_ready_webmin_crons($cron_runs++);
# wait for a new connection, or a message from a child process
local ($i, $rmask);
if (@childpids <= $config{'maxconns'}) {
# Only accept new main socket connects when ready
local $s;
foreach $s (@socketfhs) {
vec($rmask, fileno($s), 1) = 1;
}
}
else {
printf STDERR "too many children (%d > %d)\n",
scalar(@childpids), $config{'maxconns'};
}
if ($need_pipes) {
for($i=0; $i<@passin; $i++) {
vec($rmask, fileno($passin[$i]), 1) = 1;
}
}
vec($rmask, fileno(LISTEN), 1) = 1 if ($config{'listen'});
# Wait for a connection
local $sel = select($rmask, undef, undef, 2);
# Check the flag files
if ($config{'restartflag'} && -r $config{'restartflag'}) {
unlink($config{'restartflag'});
$need_restart = 1;
}
if ($config{'reloadflag'} && -r $config{'reloadflag'}) {
unlink($config{'reloadflag'});
$need_reload = 1;
}
if ($config{'stopflag'} && -r $config{'stopflag'}) {
unlink($config{'stopflag'});
$need_stop = 1;
}
if ($need_restart) {
# Got a HUP signal while in select() .. restart now
&restart_miniserv();
}
if ($need_reload) {
# Got a USR1 signal while in select() .. re-read config
$need_reload = 0;
&reload_config_file();
}
if ($need_stop) {
# Stop flag file created
&term_handler();
}
local $time_now = time();
# Clean up processes that have been idle for too long, if configured
if ($config{'maxlifetime'}) {
foreach my $c (@childpids) {
my $age = time() - $childstarts{$c};
if ($childstarts{$c} &&
$age > $config{'maxlifetime'}) {
kill(9, $c);
print STDERR "Killing long-running process $c after $age sconds\n";
delete($childstarts{$c});
}
}
}
# Clean up finished processes
local $pid;
do { $pid = waitpid(-1, WNOHANG);
@childpids = grep { $_ != $pid } @childpids;
} while($pid != 0 && $pid != -1);
@childpids = grep { kill(0, $_) } @childpids;
my %childpids = map { $_, 1 } @childpids;
foreach my $s (keys %childstarts) {
delete($childstarts{$s}) if (!$childpids{$s});
}
# Clean up connection counts from IPs that are no longer in use
foreach my $ip (keys %ipconnmap) {
$ipconnmap{$ip} = [ grep { $childpids{$_} } @{$ipconnmap{$ip}}];
}
foreach my $net (keys %netconnmap) {
$netconnmap{$net} = [ grep { $childpids{$_} } @{$netconnmap{$net}}];
}
# run the unblocking procedure to check if enough time has passed to
# unblock hosts that never been blocked because of password failures
$unblocked = 0;
if ($config{'blockhost_failures'}) {
$i = 0;
while ($i <= $#deny) {
if ($blockhosttime{$deny[$i]} &&
$config{'blockhost_time'} != 0 &&
($time_now - $blockhosttime{$deny[$i]}) >=
$config{'blockhost_time'}) {
# the host can be unblocked now
$hostfail{$deny[$i]} = 0;
splice(@deny, $i, 1);
$unblocked = 1;
}
$i++;
}
}
# Do the same for blocked users
if ($config{'blockuser_failures'}) {
$i = 0;
while ($i <= $#deny) {
if ($blockusertime{$deny[$i]} &&
$config{'blockuser_time'} != 0 &&
($time_now - $blockusertime{$deny[$i]}) >=
$config{'blockuser_time'}) {
# the user can be unblocked now
$userfail{$deny[$i]} = 0;
splice(@denyusers, $i, 1);
$unblocked = 1;
}
$i++;
}
}
if ($unblocked) {
&write_blocked_file();
}
if ($config{'session'} && (++$remove_session_count%50) == 0) {
# Remove sessions with more than 7 days of inactivity,
local $s;
foreach $s (keys %sessiondb) {
local ($user, $ltime, $lip) =
split(/\s+/, $sessiondb{$s});
if ($ltime && $time_now - $ltime > 7*24*60*60) {
&run_logout_script($s, $user, undef, undef);
&write_logout_utmp($user, $lip);
if ($user =~ /^\!/ || $sessiondb{$s} eq '') {
# Don't log anything for logged out
# sessions or those with no data
}
elsif ($use_syslog && $user) {
syslog("info", "%s",
"Timeout of session for $user");
}
elsif ($use_syslog) {
syslog("info", "%s",
"Timeout of unknown session $s ".
"with value $sessiondb{$s}");
}
delete($sessiondb{$s});
}
}
}
if ($use_pam && $config{'pam_conv'}) {
# Remove PAM sessions with more than 5 minutes of inactivity
local $c;
foreach $c (values %conversations) {
if ($time_now - $c->{'time'} > 5*60) {
&end_pam_conversation($c);
if ($use_syslog) {
syslog("info", "%s", "Timeout of PAM ".
"session for $c->{'user'}");
}
}
}
}
# Don't check any sockets if there is no activity
next if ($sel <= 0);
# Check if any of the main sockets have received a new connection
local $sn = 0;
foreach $s (@socketfhs) {
if (vec($rmask, fileno($s), 1)) {
# got new connection
$acptaddr = accept(SOCK, $s);
print DEBUG "accept returned ",length($acptaddr),"\n";
next if (!$acptaddr);
binmode(SOCK);
# Work out IP and port of client
local ($peerb, $peera, $peerp) =
&get_address_ip($acptaddr, $ipv6fhs{$s});
print DEBUG "peera=$peera peerp=$peerp\n";
# Check the number of connections from this IP
$ipconnmap{$peera} ||= [ ];
$ipconns = $ipconnmap{$peera};
if ($config{'maxconns_per_ip'} >= 0 &&
@$ipconns > $config{'maxconns_per_ip'}) {
print STDERR "Too many connections (",scalar(@$ipconns),") from IP $peera\n";
close(SOCK);
next;
}
# Also check the number of connections from the network
($peernet = $peera) =~ s/\.\d+$/\.0/;
$netconnmap{$peernet} ||= [ ];
$netconns = $netconnmap{$peernet};
if ($config{'maxconns_per_net'} >= 0 &&
@$netconns > $config{'maxconns_per_net'}) {
print STDERR "Too many connections (",scalar(@$netconns),") from network $peernet\n";
close(SOCK);
next;
}
# create pipes
local ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw);
if ($need_pipes) {
($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw) =
&allocate_pipes();
}
# Work out the local IP
(undef, $locala) = &get_socket_ip(SOCK, $ipv6fhs{$s});
print DEBUG "locala=$locala\n";
# Check username of connecting user
$localauth_user = undef;
if ($config{'localauth'} && $peera eq "127.0.0.1") {
if (open(TCP, "/proc/net/tcp")) {
# Get the info direct from the kernel
$peerh = sprintf("%4.4X", $peerp);
while(<TCP>) {
s/^\s+//;
local @t = split(/[\s:]+/, $_);
if ($t[1] eq '0100007F' &&
$t[2] eq $peerh) {
$localauth_user =
getpwuid($t[11]);
last;
}
}
close(TCP);
}
if (!$localauth_user) {
# Call lsof for the info
local $lsofpid = open(LSOF,
"$config{'localauth'} -i ".
"TCP\@127.0.0.1:$peerp |");
while(<LSOF>) {
if (/^(\S+)\s+(\d+)\s+(\S+)/ &&
$2 != $$ && $2 != $lsofpid){
$localauth_user = $3;
}
}
close(LSOF);
}
}
# Work out the hostname for this web server
$host = &get_socket_name(SOCK, $ipv6fhs{$s});
if (!$host) {
print STDERR
"Failed to get local socket name : $!\n";
close(SOCK);
next;
}
$port = $sockets[$sn]->[1];
# fork the subprocess
local $handpid;
if (!($handpid = fork())) {
# setup signal handlers
print DEBUG "in subprocess\n";
$SIG{'TERM'} = 'DEFAULT';
$SIG{'PIPE'} = 'DEFAULT';
#$SIG{'CHLD'} = 'IGNORE';
$SIG{'HUP'} = 'IGNORE';
$SIG{'USR1'} = 'IGNORE';
# Close the file handle for the session DBM
dbmclose(%sessiondb);
# close useless pipes
if ($need_pipes) {
&close_all_pipes();
close($PASSINr); close($PASSOUTw);
}
&close_all_sockets();
close(LISTEN);
# Initialize SSL for this connection
if ($use_ssl) {
($ssl_con, $ssl_certfile,
$ssl_keyfile) = &ssl_connection_for_ip(
SOCK, $ipv6fhs{$s});
print DEBUG "ssl_con returned $ssl_con\n";
$ssl_con || exit;
}
print DEBUG
"main: Starting handle_request loop pid=$$\n";
while(&handle_request($peera, $locala,
$ipv6fhs{$s})) {
# Loop until keepalive stops
}
print DEBUG
"main: Done handle_request loop pid=$$\n";
shutdown(SOCK, 1);
close(SOCK);
close($PASSINw); close($PASSOUTw);
exit;
}
push(@childpids, $handpid);
$childstarts{$handpid} = time();
push(@$ipconns, $handpid);
push(@$netconns, $handpid);
if ($need_pipes) {
close($PASSINw); close($PASSOUTr);
push(@passin, $PASSINr);
push(@passout, $PASSOUTw);
}
close(SOCK);
}
$sn++;
}
if ($config{'listen'} && vec($rmask, fileno(LISTEN), 1)) {
# Got UDP packet from another webmin server
local $rcvbuf;
local $from = recv(LISTEN, $rcvbuf, 1024, 0);
next if (!$from);
local $fromip = inet_ntoa((unpack_sockaddr_in($from))[1]);
local $toip = inet_ntoa((unpack_sockaddr_in(
getsockname(LISTEN)))[1]);
if ((!@deny || !&ip_match($fromip, $toip, @deny)) &&
(!@allow || &ip_match($fromip, $toip, @allow))) {
local $listenhost = &get_socket_name(LISTEN, 0);
send(LISTEN, "$listenhost:$config{'port'}:".
($use_ssl ? 1 : 0).":".
($config{'listenhost'} ?
&get_system_hostname() : ""),
0, $from)
if ($listenhost);
}
}
# check for session, password-timeout and PAM messages from subprocesses
for($i=0; $i<@passin; $i++) {
if (vec($rmask, fileno($passin[$i]), 1)) {
# this sub-process is asking about a password
local $infd = $passin[$i];
local $outfd = $passout[$i];
local $inline = &sysread_line($infd);
if ($inline) {
print DEBUG "main: inline $inline";
}
else {
print DEBUG "main: inline EOF\n";
}
# Search for two-factor authentication flag
# being passed, to mark the call as safe
$inline =~ /^delay\s+(\S+)\s+(\S+)\s+(\d+)\s+(nolog)/;
local $nolog = $4;
if ($inline =~ /^delay\s+(\S+)\s+(\S+)\s+(\d+)/) {
# Got a delay request from a subprocess.. for
# valid logins, there is no delay (to prevent
# denial of service attacks), but for invalid
# logins the delay increases with each failed
# attempt.
if ($3) {
# login OK.. no delay
print $outfd "0 0\n";
$wasblocked = $hostfail{$2} ||
$userfail{$1};
$hostfail{$2} = 0;
$userfail{$1} = 0;
if ($wasblocked) {
&write_blocked_file();
}
}
else {
# Login failed..
$hostfail{$2}++ if(!$nolog);
$userfail{$1}++ if(!$nolog);
$blocked = 0;
# Add the host to the block list,
# if configured
if ($config{'blockhost_failures'} &&
$hostfail{$2} >=
$config{'blockhost_failures'}) {
push(@deny, $2);
$blockhosttime{$2} = $time_now;
$blocked = 1;
if ($use_syslog) {
local $logtext = "Security alert: Host $2 blocked after $config{'blockhost_failures'} failed logins for user $1";
syslog("crit", "%s",
$logtext);
}
}
# Add the user to the user block list,
# if configured
if ($config{'blockuser_failures'} &&
$userfail{$1} >=
$config{'blockuser_failures'}) {
push(@denyusers, $1);
$blockusertime{$1} = $time_now;
$blocked = 2;
if ($use_syslog) {
local $logtext = "Security alert: User $1 blocked after $config{'blockuser_failures'} failed logins";
syslog("crit", "%s",
$logtext);
}
}
# Lock out the user's password, if enabled
if ($config{'blocklock'} &&
$userfail{$1} >=
$config{'blockuser_failures'}) {
my $lk = &lock_user_password($1);
$blocked = 2;
if ($use_syslog) {
local $logtext = $lk == 1 ? "Security alert: User $1 locked after $config{'blockuser_failures'} failed logins" : $lk < 0 ? "Security alert: User could not be locked" : "Security alert: User is already locked";
syslog("crit", "%s",
$logtext);
}
}
# Send back a delay
$dl = $userdlay{$1} -
int(($time_now - $userlast{$1})/50);
$dl = $dl < 0 ? 0 : $dl+1;
print $outfd "$dl $blocked\n";
$userdlay{$1} = $dl;
# Write out blocked status file
if ($blocked) {
&write_blocked_file();
}
}
$userlast{$1} = $time_now;
}
elsif ($inline =~ /^verify\s+(\S+)\s+(\S+)\s+(\S+)/) {
# Verifying a session ID
local $session_id = $1;
local $notimeout = $2;
local $vip = $3;
local $skey = $sessiondb{$session_id} ?
$session_id :
&hash_session_id($session_id);
if (!defined($sessiondb{$skey})) {
# Session doesn't exist
print $outfd "0 0\n";
}
else {
local ($user, $ltime, $ip) =
split(/\s+/, $sessiondb{$skey});
local $lot = &get_logout_time($user, $session_id);
if ($lot &&
$time_now - $ltime > $lot*60 &&
!$notimeout) {
# Session has timed out
print $outfd "1 ",$time_now - $ltime,"\n";
#delete($sessiondb{$skey});
}
elsif ($ip && $vip && $ip ne $vip &&
$config{'session_ip'}) {
# Session was OK, but from the
# wrong IP address
print $outfd "3 $ip\n";
}
elsif ($user =~ /^\!/) {
# Logged out session
print $outfd "0 0\n";
}
else {
# Session is OK
print $outfd "2 $user\n";
$sessiondb{$skey} = "$user $time_now $ip";
}
}
}
elsif ($inline =~ /^new\s+(\S+)\s+(\S+)\s+(\S+)/) {
# Creating a new session
local $session_id = $1;
local $user = $2;
local $ip = $3;
$sessiondb{&hash_session_id($session_id)} =
"$user $time_now $ip";
}
elsif ($inline =~ /^delete\s+(\S+)/) {
# Logging out a session
local $session_id = $1;
local $skey = $sessiondb{$session_id} ?
$session_id :
&hash_session_id($session_id);
local ($user, $ltime, $ip) =
split(/\s+/, $sessiondb{$skey});
$user =~ s/^\!//;
print $outfd $user,"\n";
$sessiondb{$skey} = "!$user $ltime $ip";
}
elsif ($inline =~ /^pamstart\s+(\S+)\s+(\S+)\s+(.*)/) {
# Starting a new PAM conversation
local ($cid, $host, $user) = ($1, $2, $3);
# Does this user even need PAM?
local ($realuser, $canlogin) =
&can_user_login($user, undef, $host);
local $conv;
if ($canlogin == 0) {
# Cannot even login!
print $outfd "0 Invalid username\n";
}
elsif ($canlogin != 2) {
# Not using PAM .. so just ask for
# the password.
$conv = { 'user' => $realuser,
'host' => $host,
'step' => 0,
'cid' => $cid,
'time' => time() };
print $outfd "3 Password\n";
}
else {
# Start the PAM conversation
# sub-process, and get a question
$conv = { 'user' => $realuser,
'host' => $host,
'cid' => $cid,
'time' => time() };
local ($PAMINr, $PAMINw, $PAMOUTr,
$PAMOUTw) = &allocate_pipes();
local $pampid = fork();
if (!$pampid) {
close($PAMOUTr); close($PAMINw);
&pam_conversation_process(
$realuser,
$PAMOUTw, $PAMINr);
}
close($PAMOUTw); close($PAMINr);
$conv->{'pid'} = $pampid;
$conv->{'PAMOUTr'} = $PAMOUTr;
$conv->{'PAMINw'} = $PAMINw;
push(@childpids, $pampid);
# Get the first PAM question
local $pok = &recv_pam_question(
$conv, $outfd);
if (!$pok) {
&end_pam_conversation($conv);
}
}
$conversations{$cid} = $conv if ($conv);
}
elsif ($inline =~ /^pamanswer\s+(\S+)\s+(.*)/) {
# A response to a PAM question
local ($cid, $answer) = ($1, $2);
local $conv = $conversations{$cid};
if (!$conv) {
# No such conversation?
print $outfd "0 Bad login session\n";
}
elsif ($conv->{'pid'}) {
# Send the PAM response and get
# the next question
&send_pam_answer($conv, $answer);
local $pok = &recv_pam_question($conv, $outfd);
if (!$pok) {
&end_pam_conversation($conv);
}
}
else {
# This must be the password .. try it
# and send back the results
local ($vu, $expired, $nonexist) =
&validate_user($conv->{'user'},
$answer,
$conf->{'host'});
local $ok = $vu ? 1 : 0;
print $outfd "2 $conv->{'user'} $ok $expired $notexist\n";
&end_pam_conversation($conv);
}
}
elsif ($inline =~ /^writesudo\s+(\S+)\s+(\d+)/) {
# Store the fact that some user can sudo to root
local ($user, $ok) = ($1, $2);
$sudocache{$user} = $ok." ".time();
}
elsif ($inline =~ /^readsudo\s+(\S+)/) {
# Query the user sudo cache (valid for 1 minute)
local $user = $1;
local ($ok, $last) =
split(/\s+/, $sudocache{$user});
if ($last < time()-60) {
# Cache too old
print $outfd "2\n";
}
else {
# Tell client OK or not
print $outfd "$ok\n";
}
}
elsif ($inline =~ /\S/) {
# Unknown line from pipe?
print DEBUG "main: Unknown line from pipe $inline\n";
print STDERR "Unknown line from pipe $inline\n";
}
else {
# close pipe
close($infd); close($outfd);
$passin[$i] = $passout[$i] = undef;
}
}
}
@passin = grep { defined($_) } @passin;
@passout = grep { defined($_) } @passout;
}
# handle_request(remoteaddress, localaddress, ipv6-flag)
# Where the real work is done
sub handle_request
{
local ($acptip, $localip, $ipv6) = @_;
seek(DEBUG, 0, 2);
print DEBUG "handle_request: from $acptip to $localip ipv6=$ipv6\n";
if ($config{'loghost'}) {
$acpthost = &to_hostname($acptip);
$acpthost = $acptip if (!$acpthost);
}
else {
$acpthost = $acptip;
}
$loghost = $acpthost;
$datestr = &http_date(time());
$ok_code = 200;
$ok_message = "Document follows";
$logged_code = undef;
$reqline = $request_uri = $page = undef;
$authuser = undef;
$validated = undef;
# check address against access list
if (@deny && &ip_match($acptip, $localip, @deny) ||
@allow && !&ip_match($acptip, $localip, @allow)) {
&http_error(403, "Access denied for ".&html_strip($acptip));
return 0;
}
if ($use_libwrap) {
# Check address with TCP-wrappers
if (!hosts_ctl($config{'pam'}, STRING_UNKNOWN,
$acptip, STRING_UNKNOWN)) {
&http_error(403, "Access denied for ".&html_strip($acptip).
" by TCP wrappers");
return 0;
}
}
print DEBUG "handle_request: passed IP checks\n";
# Compute a timeout for the start of headers, based on the number of
# child processes. As this increases, we use a shorter timeout to avoid
# an attacker overloading the system.
local $header_timeout = 60 + ($config{'maxconns'} - @childpids) * 10;
if ($header_timeout > 10*60) {
$header_timeout = 10*60;
}
# Wait at most 60 secs for start of headers for initial requests, or
# 10 minutes for kept-alive connections
local $rmask;
vec($rmask, fileno(SOCK), 1) = 1;
local $to = $checked_timeout ? 10*60 : $header_timeout;
local $sel = select($rmask, undef, undef, $to);
if (!$sel) {
if ($checked_timeout) {
print DEBUG "handle_request: exiting due to timeout of $to\n";
exit;
}
else {
&http_error(400, "Timeout",
"Waited for $to seconds for start of headers");
}
}
$checked_timeout++;
print DEBUG "handle_request: passed timeout check\n";
# Read the HTTP request line
alarm(10);
$SIG{'ALRM'} = sub { die "timeout" };
local $origreqline = &read_line();
($reqline = $origreqline) =~ s/\r|\n//g;
$method = $page = $request_uri = undef;
print DEBUG "handle_request reqline=$reqline\n";
alarm(0);
if (!$reqline && (!$use_ssl || $checked_timeout > 1)) {
# An empty request .. just close the connection
print DEBUG "handle_request: rejecting empty request\n";
return 0;
}
elsif ($reqline !~ /^(\S+)\s+(.*)\s+HTTP\/1\..$/) {
print DEBUG "handle_request: invalid reqline=$reqline\n";
if ($use_ssl) {
# This could be an http request when it should be https
$use_ssl = 0;
local $urlhost = $config{'musthost'} || $host;
$urlhost = "[".$urlhost."]" if (&check_ip6address($urlhost));
local $wantport = $port;
if ($wantport == 80 &&
&indexof(443, @listening_on_ports) >= 0) {
# Connection was to port 80, but since we are also
# accepting on port 443, redirect to that
$wantport = 443;
}
local $url = $wantport == 443 ? "https://$urlhost/"
: "https://$urlhost:$wantport/";
local $jsurl = $config{'musthost'} ?
$url :
"https://'+location.host+'";
local $jsredir = $config{'musthost'} ?
"location.href='$url'" :
"location.protocol='https:'";
$reqline = "GET / HTTP/1.1"; # Fake it for the log
&http_error(200, "Document follows",
"This web server is running in SSL mode. ".
"Trying to redirect to <a href='$url'>$url</a> instead ...".
"<script>".
"if (location.protocol != 'https:') {".
" document.querySelector('a').href='".$jsurl."';document.querySelector('a').innerText='".$jsurl."';".
"".$jsredir."".
"}".
"</script>",
0, 1);
}
elsif (ord(substr($reqline, 0, 1)) == 128 && !$use_ssl) {
# This could be an https request when it should be http ..
# need to fake a HTTP response
eval <<'EOF';
use Net::SSLeay;
eval "Net::SSLeay::SSLeay_add_ssl_algorithms()";
eval "Net::SSLeay::load_error_strings()";
$ssl_ctx = Net::SSLeay::CTX_new();
Net::SSLeay::CTX_use_RSAPrivateKey_file(
$ssl_ctx, $config{'keyfile'},
&Net::SSLeay::FILETYPE_PEM);
Net::SSLeay::CTX_use_certificate_file(
$ssl_ctx,
$config{'certfile'} || $config{'keyfile'},
&Net::SSLeay::FILETYPE_PEM);
$ssl_con = Net::SSLeay::new($ssl_ctx);
pipe(SSLr, SSLw);
if (!fork()) {
close(SSLr);
select(SSLw); $| = 1; select(STDOUT);
print SSLw $origreqline;
local $buf;
while(sysread(SOCK, $buf, 1) > 0) {
print SSLw $buf;
}
close(SOCK);
exit;
}
close(SSLw);
Net::SSLeay::set_wfd($ssl_con, fileno(SOCK));
Net::SSLeay::set_rfd($ssl_con, fileno(SSLr));
Net::SSLeay::accept($ssl_con) || die "accept() failed";
$use_ssl = 1;
local $url = $config{'musthost'} ?
"https://$config{'musthost'}:$port/" :
"https://$host:$port/";
$reqline = "GET / HTTP/1.1"; # Fake it for the log
&http_error(200, "Bad Request", "This web server is not running in SSL mode. Try the URL <a href='$url'>$url</a> instead.", 0, 1);
EOF
if ($@) {
&http_error(400, "Bad Request");
}
}
else {
&http_error(400, "Bad Request");
}
}
$method = $1;
$request_uri = $page = $2;
%header = ();
# Read HTTP headers
alarm(60);
$SIG{'ALRM'} = sub { die "timeout" };
local $lastheader;
while(1) {
($headline = &read_line()) =~ s/\r|\n//g;
last if ($headline eq "");
print DEBUG "handle_request: got headline $headline\n";
if ($headline =~ /^(\S+):\s*(.*)$/) {
$header{$lastheader = lc($1)} = $2;
}
elsif ($headline =~ /^\s+(.*)$/) {
$header{$lastheader} .= $headline;
}
else {
alarm(0);
&http_error(400, "Bad Header ".&html_strip($headline));
}
if (&is_bad_header($header{$lastheader}, $lastheader)) {
alarm(0);
delete($header{$lastheader});
&http_error(400, "Bad Header Contents ".
&html_strip($lastheader));
}
}
alarm(0);
# If a remote IP is given in a header (such as via a proxy), only use it
# for logging unless trust_real_ip is set
local $headerhost = $header{'x-forwarded-for'} ||
$header{'x-real-ip'};
if ($headerhost) {
# Only real IPs are allowed
$headerhost = undef if (!&check_ipaddress($headerhost) &&
!&check_ip6address($headerhost));
}
if ($config{'trust_real_ip'}) {
$acpthost = $headerhost || $acpthost;
if (&check_ipaddress($headerhost) || &check_ip6address($headerhost)) {
# If a remote IP was given, use it for all access control checks
# from now on.
$acptip = $headerhost;
# re-check remote address against access list
if (@deny && &ip_match($acptip, $localip, @deny) ||
@allow && !&ip_match($acptip, $localip, @allow)) {
&http_error(403, "Access denied for ".&html_strip($acptip));
return 0;
}
if ($use_libwrap) {
# Check address with TCP-wrappers
if (!hosts_ctl($config{'pam'}, STRING_UNKNOWN,
$acptip, STRING_UNKNOWN)) {
&http_error(403, "Access denied for ".&html_strip($acptip).
" by TCP wrappers");
return 0;
}
}
print DEBUG "handle_request: passed Remote IP checks\n";
}
$loghost = $acpthost;
}
else {
$loghost = $headerhost || $loghost;
}
if (defined($header{'host'})) {
if ($header{'host'} =~ /^\[(.+)\]:([0-9]+)$/) {
($host, $port) = ($1, $2);
}
elsif ($header{'host'} =~ /^([^:]+):([0-9]+)$/) {
($host, $port) = ($1, $2);
}
else {
$host = $header{'host'};
}
if ($config{'musthost'} && $host ne $config{'musthost'}) {
# Disallowed hostname used
&http_error(400, "Invalid HTTP hostname");
}
}
# Create strings for use in redirects
$ssl = $config{'redirect_ssl'} ne '' ? $config{'redirect_ssl'} : $use_ssl;
$redirport = $config{'redirect_port'} || $port;
$redirport = $config{'redirect_port'}
if ($config{'redirect_host'});
$portstr = $redirport == 80 && !$ssl ? "" :
$redirport == 443 && $ssl ? "" : ":".$redirport;
$redirhost = $config{'redirect_host'} || $host;
$hostport = &check_ip6address($redirhost) ? "[".$redirhost."]".$portstr
: $redirhost.$portstr;
# If the redirect_prefix exists change redirect base to include the prefix #1271
if ($config{'redirect_prefix'}) {
$hostport .= $config{'redirect_prefix'}
}
$prot = $ssl ? "https" : "http";
undef(%in);
if ($page =~ /^([^\?]+)\?(.*)$/) {
# There is some query string information
$page = $1;
$querystring = $2;
print DEBUG "handle_request: querystring=$querystring\n";
if ($querystring !~ /=/) {
$queryargs = $querystring;
$queryargs =~ s/\+/ /g;
$queryargs =~ s/%(..)/pack("c",hex($1))/ge;
$querystring = "";
}
else {
# Parse query-string parameters
local @in = split(/\&/, $querystring);
foreach $i (@in) {
local ($k, $v) = split(/=/, $i, 2);
$k =~ s/\+/ /g; $k =~ s/%(..)/pack("c",hex($1))/ge;
$v =~ s/\+/ /g; $v =~ s/%(..)/pack("c",hex($1))/ge;
$in{$k} = $v;
}
}
}
$posted_data = undef;
if ($method eq 'POST' &&
$header{'content-type'} eq 'application/x-www-form-urlencoded') {
# Read in posted query string information, up the configured maximum
# post request length
$clen = $header{"content-length"};
$clen_read = $clen > $config{'max_post'} ? $config{'max_post'} : $clen;
while(length($posted_data) < $clen_read) {
alarm(60);
$SIG{'ALRM'} = sub { die "timeout" };
eval {
$buf = &read_data($clen_read - length($posted_data));
};
alarm(0);
if ($@) {
&http_error(500, "Timeout reading POST request");
}
if (!length($buf)) {
&http_error(500, "Failed to read POST request");
}
chomp($posted_data);
$posted_data =~ s/\015$//mg;
$posted_data .= $buf;
}
print DEBUG "clen_read=$clen_read clen=$clen posted_data=",length($posted_data),"\n";
if ($clen_read != $clen && length($posted_data) > $clen) {
# If the client sent more data than we asked for, chop the
# rest off
$posted_data = substr($posted_data, 0, $clen);
}
if (length($posted_data) > $clen) {
# When the client sent too much, delay so that it gets headers
sleep(3);
}
if ($header{'user-agent'} =~ /MSIE/ &&
$header{'user-agent'} !~ /Opera/i) {
# MSIE includes an extra newline in the data
$posted_data =~ s/\r|\n//g;
}
local @in = split(/\&/, $posted_data);
foreach $i (@in) {
local ($k, $v) = split(/=/, $i, 2);
#$v =~ s/\r|\n//g;
$k =~ s/\+/ /g; $k =~ s/%(..)/pack("c",hex($1))/ge;
$v =~ s/\+/ /g; $v =~ s/%(..)/pack("c",hex($1))/ge;
$in{$k} = $v;
}
print DEBUG "handle_request: posted_data=$posted_data\n";
}
# Reject CONNECT request, which isn't supported
if ($method eq "CONNECT" || $method eq "TRACE") {
&http_error(405, "Method ".&html_strip($method)." is not supported");
}
# work out accepted encodings
%acceptenc = map { $_, 1 } split(/,/, $header{'accept-encoding'});
# replace %XX sequences in page
$page =~ s/%(..)/pack("c",hex($1))/ge;
# Check if the browser's user agent indicates a mobile device
$mobile_device = &is_mobile_useragent($header{'user-agent'});
# Check if Host: header is for a mobile URL
foreach my $m (@mobile_prefixes) {
if ($header{'host'} =~ /^\Q$m\E/i) {
$mobile_device = 1;
}
}
# check for the logout flag file, and if existent deny authentication
if ($config{'logout'} && -r $config{'logout'}.$in{'miniserv_logout_id'}) {
print DEBUG "handle_request: logout flag set\n";
$deny_authentication++;
open(LOGOUT, $config{'logout'}.$in{'miniserv_logout_id'});
chop($count = <LOGOUT>);
close(LOGOUT);
$count--;
if ($count > 0) {
open(LOGOUT, ">$config{'logout'}$in{'miniserv_logout_id'}");
print LOGOUT "$count\n";
close(LOGOUT);
}
else {
unlink($config{'logout'}.$in{'miniserv_logout_id'});
}
}
# check for any redirect for the requested URL
foreach my $pfx (@strip_prefix) {
my $l = length($pfx);
if(length($page) >= $l &&
substr($page,0,$l) eq $pfx) {
$page=substr($page,$l);
last;
}
}
$simple = &simplify_path($page, $bogus);
$rpath = $simple;
$rpath .= "&".$querystring if (defined($querystring));
$redir = $redirect{$rpath};
if (defined($redir)) {
print DEBUG "handle_request: redir=$redir\n";
&write_data("HTTP/1.0 302 Moved Temporarily\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Server: $config{'server'}\r\n");
&write_data("Location: $prot://$hostport$redir\r\n");
&write_keep_alive(0);
&write_data("\r\n");
return 0;
}
# Check for a DAV request
$davpath = undef;
foreach my $d (@davpaths) {
if ($simple eq $d || $simple =~ /^\Q$d\E\//) {
$davpath = $d;
last;
}
}
if (!$davpath && ($method eq "SEARCH" || $method eq "PUT")) {
&http_error(400, "Bad Request method ".&html_strip($method));
}
# Check for some form of authentication
print DEBUG "handle_request: Need authentication\n";
$validated = 0;
$blocked = 0;
# Session authentication is never used for connections by
# another webmin server, or for specified pages, or for DAV, or XMLRPC,
# or mobile browsers if requested.
if ($header{'user-agent'} =~ /webmin/i ||
$header{'user-agent'} =~ /$config{'agents_nosession'}/i ||
$sessiononly{$simple} || $davpath ||
$simple eq "/xmlrpc.cgi" ||
$acptip eq $config{'host_nosession'} ||
$mobile_device && $config{'mobile_nosession'}) {
print DEBUG "handle_request: Forcing HTTP authentication\n";
$config{'session'} = 0;
}
# Check for SSL authentication
if ($use_ssl && $verified_client) {
$peername = Net::SSLeay::X509_NAME_oneline(
Net::SSLeay::X509_get_subject_name(
Net::SSLeay::get_peer_certificate(
$ssl_con)));
$u = &find_user_by_cert($peername);
if ($u) {
$authuser = $u;
$validated = 2;
}
if ($use_syslog && !$validated) {
syslog("crit", "%s",
"Unknown SSL certificate $peername");
}
}
if (!$validated && !$deny_authentication) {
# check for IP-based authentication
local $a;
foreach $a (keys %ipaccess) {
if ($acptip eq $a) {
# It does! Auth as the user
$validated = 3;
$baseauthuser = $authuser =
$ipaccess{$a};
}
}
}
# Check for normal HTTP authentication
if (!$validated && !$deny_authentication && !$config{'session'} &&
$header{authorization} =~ /^basic\s+(\S+)$/i) {
# authorization given..
($authuser, $authpass) = split(/:/, &b64decode($1), 2);
print DEBUG "handle_request: doing basic auth check authuser=$authuser authpass=$authpass\n";
local ($vu, $expired, $nonexist, $wvu) =
&validate_user($authuser, $authpass, $host,
$acptip, $port);
print DEBUG "handle_request: vu=$vu expired=$expired nonexist=$nonexist\n";
if ($vu && (!$expired || $config{'passwd_mode'} == 1)) {
$authuser = $vu;
$validated = 1;
}
else {
$validated = 0;
}
if ($use_syslog && !$validated) {
syslog("crit", "%s",
($nonexist ? "Non-existent" :
$expired ? "Expired" : "Invalid").
" login as $authuser from $acpthost");
}
if ($authuser =~ /\r|\n|\s/) {
&http_error(500, "Invalid username",
"Username contains invalid characters");
}
if ($authpass =~ /\r|\n/) {
&http_error(500, "Invalid password",
"Password contains invalid characters");
}
if ($config{'passdelay'} && $authuser) {
# check with main process for delay
print DEBUG "handle_request: about to ask for password delay\n";
print $PASSINw "delay $authuser $acptip $validated\n";
<$PASSOUTr> =~ /(\d+) (\d+)/;
$blocked = $2;
print DEBUG "handle_request: password delay $1 $2\n";
sleep($1);
}
}
# Check for a visit to the special session login page
if ($config{'session'} && !$deny_authentication &&
$page eq $config{'session_login'}) {
if ($in{'logout'} && $header{'cookie'} =~ /(^|\s|;)$sidname=([a-f0-9]+)/) {
# Logout clicked .. remove the session
local $sid = $2;
print $PASSINw "delete $sid\n";
local $louser = <$PASSOUTr>;
chop($louser);
$logout = 1;
$already_session_id = undef;
$authuser = $baseauthuser = undef;
if ($louser) {
if ($use_syslog) {
syslog("info", "%s", "Logout by $louser from $acpthost");
}
&run_logout_script($louser, $sid,
$loghost, $localip);
&write_logout_utmp($louser, $actphost);
}
}
elsif ($in{'session'}) {
# Session ID given .. put it in the cookie if valid
local $sid = $in{'session'};
if ($sid =~ /\r|\n|\s/) {
&http_error(500, "Invalid session",
"Session ID contains invalid characters");
}
print $PASSINw "verify $sid 0 $acptip\n";
<$PASSOUTr> =~ /(\d+)\s+(\S+)/;
if ($1 != 2) {
&http_error(500, "Invalid session",
"Session ID is not valid");
}
local $vu = $2;
local $hrv = &handle_login(
$vu, $vu ? 1 : 0,
0, 0, undef, 1, 0);
return $hrv if (defined($hrv));
}
else {
# Trim username to remove leading and trailing spaces to
# be able to login, if username pastes from somewhere
$in{'user'} =~ s/^\s+|\s+$//g;
# Validate the user
if ($in{'user'} =~ /\r|\n|\s/) {
&run_failed_script($in{'user'}, 'baduser',
$loghost, $localip);
&http_error(500, "Invalid username",
"Username contains invalid characters");
}
if ($in{'pass'} =~ /\r|\n/) {
&run_failed_script($in{'user'}, 'badpass',
$loghost, $localip);
&http_error(500, "Invalid password",
"Password contains invalid characters");
}
local ($vu, $expired, $nonexist, $wvu) =
&validate_user($in{'user'}, $in{'pass'}, $host,
$acptip, $port);
if ($vu && $wvu) {
my $uinfo = &get_user_details($wvu, $vu);
if ($uinfo && $uinfo->{'twofactor_provider'}) {
# Check two-factor token ID
$err = &validate_twofactor(
$wvu, $in{'twofactor'}, $vu);
if ($err) {
&run_failed_script(
$vu, 'twofactor',
$loghost, $localip);
$twofactor_msg = $err;
$twofactor_nolog = 'nolog' if (!$in{'twofactor'});
$vu = undef;
}
}
}
local $hrv = &handle_login(
$vu || $in{'user'}, $vu ? 1 : 0,
$expired, $nonexist, $in{'pass'},
$in{'notestingcookie'}, $twofactor_nolog);
return $hrv if (defined($hrv));
}
}
# Check for a visit to the special PAM login page
if ($config{'session'} && !$deny_authentication &&
$use_pam && $config{'pam_conv'} && $page eq $config{'pam_login'} &&
!$in{'restart'}) {
# A question has been entered .. submit it to the main process
print DEBUG "handle_request: Got call to $page ($in{'cid'})\n";
print DEBUG "handle_request: For PAM, authuser=$authuser\n";
if ($in{'answer'} =~ /\r|\n/ || $in{'cid'} =~ /\r|\n|\s/) {
&http_error(500, "Invalid response",
"Response contains invalid characters");
}
if (!$in{'cid'}) {
# Start of a new conversation - answer must be username
$cid = &generate_random_id();
print $PASSINw "pamstart $cid $host $in{'answer'}\n";
}
else {
# A response to a previous question
$cid = $in{'cid'};
print $PASSINw "pamanswer $cid $in{'answer'}\n";
}
# Read back the response, and the next question (if any)
local $line = <$PASSOUTr>;
$line =~ s/\r|\n//g;
local ($rv, $question) = split(/\s+/, $line, 2);
if ($rv == 0) {
# Cannot login!
local $hrv = &handle_login(
!$in{'cid'} && $in{'answer'} ? $in{'answer'}
: "unknown",
0, 0, 1, undef);
return $hrv if (defined($hrv));
}
elsif ($rv == 1 || $rv == 3) {
# Another question .. force use of PAM CGI
$validated = 1;
$method = "GET";
$querystring .= "&cid=$cid&question=".
&urlize($question);
$querystring .= "&password=1" if ($rv == 3);
$queryargs = "";
$page = $config{'pam_login'};
$miniserv_internal = 1;
$logged_code = 401;
}
elsif ($rv == 2) {
# Got back a final ok or failure
local ($user, $ok, $expired, $nonexist) =
split(/\s+/, $question);
local $hrv = &handle_login(
$user, $ok, $expired, $nonexist, undef,
$in{'notestingcookie'});
return $hrv if (defined($hrv));
}
elsif ($rv == 4) {
# A message from PAM .. tell the user
$validated = 1;
$method = "GET";
$querystring .= "&cid=$cid&message=".
&urlize($question);
$queryargs = "";
$page = $config{'pam_login'};
$miniserv_internal = 1;
$logged_code = 401;
}
}
# Check for a visit to the special password change page
if ($config{'session'} && !$deny_authentication &&
$page eq $config{'password_change'} && !$validated) {
# Just let this slide ..
$validated = 1;
$miniserv_internal = 3;
}
# Check for an existing session
if ($config{'session'} && !$validated) {
if ($already_session_id) {
$session_id = $already_session_id;
$authuser = $already_authuser;
$validated = 1;
}
elsif (!$deny_authentication &&
$header{'cookie'} =~ /(^|\s|;)$sidname=([a-f0-9]+)/) {
# Try all session cookies
local $cookie = $header{'cookie'};
while($cookie =~ s/(^|\s|;)$sidname=([a-f0-9]+)//) {
$session_id = $2;
local $notimeout =
$in{'webmin_notimeout'} ? 1 : 0;
print $PASSINw "verify $session_id $notimeout $acptip\n";
<$PASSOUTr> =~ /(\d+)\s+(\S+)/;
if ($1 == 2) {
# Valid session continuation
$validated = 1;
$authuser = $2;
$already_authuser = $authuser;
$timed_out = undef;
last;
}
elsif ($1 == 1) {
# Session timed out
$timed_out = $2;
}
elsif ($1 == 3) {
# Session is OK, but from the wrong IP
print STDERR "Session $session_id was ",
"used from $acptip instead of ",
"original IP $2\n";
}
else {
# Invalid session ID .. don't set
# verified flag
}
}
}
if ($authuser) {
# We got a session .. but does the user still exist?
my @can = &can_user_login($authuser, undef, $host);
$baseauthuser = $can[3] || $authuser;
my $auser = &get_user_details($baseauthuser, $authuser);
if (!$auser) {
print STDERR "Session $session_id is for user ",
"$authuser who does not exist\n";
$validated = 0;
$already_authuser = $authuser = undef;
}
}
}
# Check for local authentication
if ($localauth_user && !$header{'x-forwarded-for'} && !$header{'via'}) {
my $luser = &get_user_details($localauth_user);
if ($luser) {
# Local user exists in webmin users file
$validated = 1;
$authuser = $localauth_user;
}
else {
# Check if local user is allowed by unixauth
local @can = &can_user_login($localauth_user,
undef, $host);
if ($can[0]) {
$validated = 2;
$authuser = $localauth_user;
}
else {
$localauth_user = undef;
}
}
}
if (!$validated) {
# Check if this path allows anonymous access
local $a;
foreach $a (keys %anonymous) {
if (substr($simple, 0, length($a)) eq $a) {
# It does! Auth as the user, if IP access
# control allows him.
if (&check_user_ip($anonymous{$a}) &&
&check_user_time($anonymous{$a})) {
$validated = 3;
$baseauthuser = $authuser =
$anonymous{$a};
}
}
}
}
if (!$validated) {
# Check if this path allows unauthenticated access
local ($u, $unauth);
foreach $u (@unauth) {
$unauth++ if ($simple =~ /$u/);
}
if (!$bogus && $unauth) {
# Unauthenticated directory or file request - approve it
$validated = 4;
$baseauthuser = $authuser = undef;
}
}
if (!$validated) {
if ($blocked == 0) {
# No password given.. ask
if ($config{'pam_conv'} && $use_pam) {
# Force CGI for PAM question, starting with
# the username which is always needed
$validated = 1;
$method = "GET";
$querystring .= "&initial=1&question=".
&urlize("Username");
$querystring .= "&failed=$failed_user" if ($failed_user);
$querystring .= "&timed_out=$timed_out" if ($timed_out);
$queryargs = "";
$page = $config{'pam_login'};
$miniserv_internal = 1;
$logged_code = 401;
}
elsif ($config{'session'}) {
# Force CGI for session login
$validated = 1;
if ($logout) {
$querystring .= "&logout=1&page=/";
}
else {
# Re-direct to current module only
local $rpage = $request_uri;
if (!$config{'loginkeeppage'}) {
$rpage =~ s/\?.*$//;
$rpage =~ s/[^\/]+$//
}
$querystring = "page=".&urlize($rpage);
}
$method = "GET";
$querystring .= "&failed=".&urlize($failed_user)
if ($failed_user);
if ($twofactor_msg) {
$querystring .= "&failed_save=".&urlize($failed_save);
$querystring .= "&failed_pass=".&urlize($failed_pass);
$querystring .= "&failed_twofactor_attempt=".&urlize($failed_twofactor_attempt);
$querystring .= "&twofactor_msg=".&urlize($twofactor_msg);
}
$querystring .= "&timed_out=$timed_out"
if ($timed_out);
$queryargs = "";
$page = $config{'session_login'};
$miniserv_internal = 1;
$logged_code = 401;
}
else {
# Ask for login with HTTP authentication
&write_data("HTTP/1.0 401 Unauthorized\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Server: $config{'server'}\r\n");
&write_data("WWW-authenticate: Basic ".
"realm=\"$config{'realm'}\"\r\n");
&write_keep_alive(0);
&write_data("Content-type: text/html; Charset=utf-8\r\n");
&write_data("\r\n");
&reset_byte_count();
&write_data("<html>\n");
&write_data("<head>".&embed_error_styles($roots[0])."<title>401 — Unauthorized</title></head>\n");
&write_data("<body><h2 class=\"err-head\">401 — Unauthorized</h2>\n");
&write_data("<p class=\"err-content\">A password is required to access this\n");
&write_data("web server. Please try again.</p> <p>\n");
&write_data("</body></html>\n");
&log_request($loghost, undef, $reqline, 401, &byte_count());
return 0;
}
}
elsif ($blocked == 1) {
# when the host has been blocked, give it an error
&http_error(403, "Access denied for $acptip. The host ".
"has been blocked because of too ".
"many authentication failures.");
}
elsif ($blocked == 2) {
# when the user has been blocked, give it an error
&http_error(403, "Access denied. The user ".
"has been blocked because of too ".
"many authentication failures.");
}
}
else {
# Get the real Webmin username
if (!$baseauthuser) {
local @can = &can_user_login($authuser, undef, $host);
$baseauthuser = $can[3] || $authuser;
}
if ($config{'remoteuser'} && !$< && $validated) {
# Switch to the UID of the remote user (if he exists)
local @u = getpwnam($authuser);
if (@u && $< != $u[2]) {
$( = $u[3]; $) = "$u[3] $u[3]";
($>, $<) = ($u[2], $u[2]);
}
else {
&http_error(500, "Unix user ".
&html_strip($authuser)." does not exist");
return 0;
}
}
}
# Check per-user IP access control
if (!&check_user_ip($baseauthuser)) {
&http_error(403, "Access denied for $acptip for ".
&html_strip($baseauthuser));
return 0;
}
# Check per-user allowed times
if (!&check_user_time($baseauthuser)) {
&http_error(403, "Access denied at the current time");
return 0;
}
$uinfo = &get_user_details($baseauthuser, $authuser);
# Validate the path, and convert to canonical form
rerun:
$simple = &simplify_path($page, $bogus);
print DEBUG "handle_request: page=$page simple=$simple\n";
if ($bogus) {
&http_error(400, "Invalid path");
return 0;
}
# Check for a DAV request
if ($davpath) {
return &handle_dav_request($davpath);
}
# Check for a websockets request
if (lc($header{'connection'}) =~ /upgrade/ &&
lc($header{'upgrade'}) eq 'websocket' &&
$baseauthuser) {
print DEBUG "websockets request to $simple\n";
my ($ws) = grep { $_->{'path'} eq $simple } @websocket_paths;
if (!$ws) {
&http_error(400, "Unknown websocket path");
return 0;
}
return &handle_websocket_request($ws, $simple);
}
# Work out the active theme(s)
local $preroots = $mobile_device && defined($config{'mobile_preroot'}) ?
$config{'mobile_preroot'} :
$authuser && defined($config{'preroot_'.$authuser}) ?
$config{'preroot_'.$authuser} :
$uinfo && defined($uinfo->{'preroot'}) ?
$uinfo->{'preroot'} :
$config{'preroot'};
local @preroots = reverse(split(/\s+/, $preroots));
# Canonicalize the directories
local @themes;
foreach my $preroot (@preroots) {
# Always under the current webmin root
$preroot =~ s/^.*\///g;
push(@themes, $preroot);
$preroot = $roots[0].'/'.$preroot;
}
# Look in the theme root directories first
local ($full, @stfull);
$foundroot = undef;
foreach my $preroot (@preroots) {
$is_directory = 1;
$sofar = "";
$full = $preroot.$sofar;
$scriptname = $simple;
foreach $b (split(/\//, $simple)) {
if ($b ne "") { $sofar .= "/$b"; }
$full = $preroot.$sofar;
@stfull = stat($full);
if (!@stfull) { undef($full); last; }
# Check if this is a directory
if (-d _) {
# It is.. go on parsing
$is_directory = 1;
next;
}
else {
$is_directory = 0;
}
# Check if this is a CGI program
if (&get_type($full) eq "internal/cgi") {
$pathinfo = substr($simple, length($sofar));
$pathinfo .= "/" if ($page =~ /\/$/);
$scriptname = $sofar;
last;
}
}
# Don't stop at a directory unless this is the last theme, which
# is the 'real' one that provides the .cgi scripts
if ($is_directory && $preroot ne $preroots[$#preroots]) {
next;
}
if ($full) {
# Found it!
if ($sofar eq '') {
$cgi_pwd = $roots[0];
}
elsif ($is_directory) {
$cgi_pwd = "$roots[0]$sofar";
}
else {
"$roots[0]$sofar" =~ /^(.*\/)[^\/]+$/;
$cgi_pwd = $1;
}
$foundroot = $preroot;
if ($is_directory) {
# Check for index files in the directory
local $foundidx;
foreach $idx (split(/\s+/, $config{"index_docs"})) {
$idxfull = "$full/$idx";
local @stidxfull = stat($idxfull);
if (-r _ && !-d _) {
$full = $idxfull;
@stfull = @stidxfull;
$is_directory = 0;
$scriptname .= "/"
if ($scriptname ne "/");
$foundidx++;
last;
}
}
@stfull = stat($full) if (!$foundidx);
}
}
last if ($foundroot);
}
print DEBUG "handle_request: initial full=$full\n";
# Look in the real root directories, stopping when we find a file or directory
if (!$full || $is_directory) {
ROOT: foreach $root (@roots) {
$sofar = "";
$full = $root.$sofar;
$scriptname = $simple;
foreach $b ($simple eq "/" ? ( "" ) : split(/\//, $simple)) {
if ($b ne "") { $sofar .= "/$b"; }
$full = $root.$sofar;
@stfull = stat($full);
if (!@stfull) {
next ROOT;
}
# Check if this is a directory
if (-d _) {
# It is.. go on parsing
next;
}
# Check if this is a CGI program
if (&get_type($full) eq "internal/cgi") {
$pathinfo = substr($simple, length($sofar));
$pathinfo .= "/" if ($page =~ /\/$/);
$scriptname = $sofar;
last;
}
}
# Run CGI in the same directory as whatever file
# was requested
$full =~ /^(.*\/)[^\/]+$/; $cgi_pwd = $1;
if (-e $full) {
# Found something!
$realroot = $root;
$foundroot = $root;
last;
}
}
if (!@stfull) { &http_error(404, "File not found"); }
}
print DEBUG "handle_request: full=$full\n";
@stfull = stat($full) if (!@stfull);
# check filename against denyfile regexp
local $denyfile = $config{'denyfile'};
if ($denyfile && $full =~ /$denyfile/) {
&http_error(403, "Access denied to ".&html_strip($page));
return 0;
}
# Reached the end of the path OK.. see what we've got
if (-d _) {
# See if the URL ends with a / as it should
print DEBUG "handle_request: found a directory\n";
if ($page !~ /\/$/) {
# It doesn't.. redirect
&write_data("HTTP/1.0 302 Moved Temporarily\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Server: $config{server}\r\n");
&write_data("Location: $prot://$hostport$page/\r\n");
&write_keep_alive(0);
&write_data("\r\n");
&log_request($loghost, $authuser, $reqline, 302, 0);
return 0;
}
# A directory.. check for index files
local $foundidx;
foreach $idx (split(/\s+/, $config{"index_docs"})) {
$idxfull = "$full/$idx";
@stidxfull = stat($idxfull);
if (-r _ && !-d _) {
$cgi_pwd = $full;
$full = $idxfull;
@stfull = @stidxfull;
$scriptname .= "/" if ($scriptname ne "/");
$foundidx++;
last;
}
}
@stfull = stat($full) if (!$foundidx);
}
if (-d _) {
# This is definitely a directory.. list it
if ($config{'nolistdir'}) {
&http_error(500, "Directory is missing an index file");
}
print DEBUG "handle_request: listing directory\n";
local $resp = "HTTP/1.0 $ok_code $ok_message\r\n".
"Date: $datestr\r\n".
"Server: $config{server}\r\n".
"Content-type: text/html; Charset=utf-8\r\n";
&write_data($resp);
&write_keep_alive(0);
&write_data("\r\n");
&reset_byte_count();
&write_data("".&embed_error_styles($roots[0])."<h2 class=\"err-head\">Index of $simple</h2>\n");
&write_data("<pre class=\"err-content\">\n");
&write_data(sprintf "%-35.35s %-20.20s %-10.10s\n",
"Name", "Last Modified", "Size");
&write_data("</pre>\n");
&write_data("<hr>\n");
opendir(DIR, $full);
while($df = readdir(DIR)) {
if ($df =~ /^\./) { next; }
$fulldf = $full eq "/" ? $full.$df : $full."/".$df;
(@stbuf = stat($fulldf)) || next;
if (-d _) { $df .= "/"; }
@tm = localtime($stbuf[9]);
$fdate = sprintf "%2.2d/%2.2d/%4.4d %2.2d:%2.2d:%2.2d",
$tm[3],$tm[4]+1,$tm[5]+1900,
$tm[0],$tm[1],$tm[2];
$len = length($df); $rest = " "x(35-$len);
&write_data(sprintf
"<a href=\"%s\">%-${len}.${len}s</a>$rest %-20.20s %-10.10s\n",
&urlize($df), &html_strip($df), $fdate, $stbuf[7]);
}
closedir(DIR);
&log_request($loghost, $authuser, $reqline, $ok_code, &byte_count());
return 0;
}
# CGI or normal file
local $rv;
if (&get_type($full) eq "internal/cgi" && $validated != 4) {
# A CGI program to execute
print DEBUG "handle_request: executing CGI\n";
$envtz = $ENV{"TZ"};
$envuser = $ENV{"USER"};
$envpath = $ENV{"PATH"};
$envlang = $ENV{"LANG"};
$envroot = $ENV{"SystemRoot"};
$envperllib = $ENV{'PERLLIB'};
$envdoclroot = $ENV{'LIBROOT'};
foreach my $k (keys %ENV) {
delete($ENV{$k});
}
$ENV{"PATH"} = $envpath if ($envpath);
$ENV{"TZ"} = $envtz if ($envtz);
$ENV{"USER"} = $envuser if ($envuser);
$ENV{"OLD_LANG"} = $envlang if ($envlang);
$ENV{"SystemRoot"} = $envroot if ($envroot);
$ENV{'LIBROOT'} = $envdoclroot if ($envdoclroot);
$ENV{'PERLLIB'} = $envperllib if ($envperllib);
$ENV{"HOME"} = $user_homedir;
$ENV{"SERVER_SOFTWARE"} = $config{"server"};
$ENV{"SERVER_NAME"} = $host;
$ENV{"SERVER_ADMIN"} = $config{"email"};
$ENV{"SERVER_ROOT"} = $roots[0];
$ENV{"SERVER_REALROOT"} = $realroot;
$ENV{"SERVER_PORT"} = $port;
$ENV{"REMOTE_HOST"} = $acpthost;
$ENV{"REMOTE_ADDR"} = $acptip;
$ENV{"REMOTE_ADDR_PROTOCOL"} = $ipv6 ? 6 : 4;
$ENV{"REMOTE_USER"} = $authuser;
$ENV{"BASE_REMOTE_USER"} = $authuser ne $baseauthuser ?
$baseauthuser : undef;
$ENV{"REMOTE_PASS"} = $authpass if (defined($authpass) &&
$config{'pass_password'});
if ($uinfo && $uinfo->{'proto'}) {
$ENV{"REMOTE_USER_PROTO"} = $uinfo->{'proto'};
$ENV{"REMOTE_USER_ID"} = $uinfo->{'id'};
}
print DEBUG "REMOTE_USER = ",$ENV{"REMOTE_USER"},"\n";
print DEBUG "BASE_REMOTE_USER = ",$ENV{"BASE_REMOTE_USER"},"\n";
print DEBUG "proto=$uinfo->{'proto'} id=$uinfo->{'id'}\n" if ($uinfo);
$ENV{"SSL_USER"} = $peername if ($validated == 2);
$ENV{"ANONYMOUS_USER"} = "1" if ($validated == 3 || $validated == 4);
$ENV{"DOCUMENT_ROOT"} = $roots[0];
$ENV{"THEME_ROOT"} = $preroots[0];
$ENV{"THEME_DIRS"} = join(" ", @themes) || "";
$ENV{"DOCUMENT_REALROOT"} = $realroot;
$ENV{"GATEWAY_INTERFACE"} = "CGI/1.1";
$ENV{"SERVER_PROTOCOL"} = "HTTP/1.0";
$ENV{"REQUEST_METHOD"} = $method;
$ENV{"SCRIPT_NAME"} = $scriptname;
$ENV{"SCRIPT_FILENAME"} = $full;
$ENV{"REQUEST_URI"} = $request_uri;
$ENV{"PATH_INFO"} = $pathinfo;
if ($pathinfo) {
$ENV{"PATH_TRANSLATED"} = "$roots[0]$pathinfo";
$ENV{"PATH_REALTRANSLATED"} = "$realroot$pathinfo";
}
$ENV{"QUERY_STRING"} = $querystring;
$ENV{"MINISERV_CONFIG"} = $config_file;
$ENV{"HTTPS"} = $use_ssl ? "ON" : "";
$ENV{"SSL_HSTS"} = $config{"ssl_hsts"};
$ENV{"MINISERV_PID"} = $miniserv_main_pid;
if ($use_ssl) {
$ENV{"MINISERV_CERTFILE"} = $ssl_certfile;
$ENV{"MINISERV_KEYFILE"} = $ssl_keyfile;
}
$ENV{"SESSION_ID"} = $session_id if ($session_id);
$ENV{"LOCAL_USER"} = $localauth_user if ($localauth_user);
$ENV{"MINISERV_INTERNAL"} = $miniserv_internal if ($miniserv_internal);
if (defined($header{"content-length"})) {
$ENV{"CONTENT_LENGTH"} = $header{"content-length"};
}
if (defined($header{"content-type"})) {
$ENV{"CONTENT_TYPE"} = $header{"content-type"};
}
foreach $h (keys %header) {
($hname = $h) =~ tr/a-z/A-Z/;
$hname =~ s/\-/_/g;
$ENV{"HTTP_$hname"} = $header{$h};
}
$ENV{"PWD"} = $cgi_pwd;
foreach $k (keys %config) {
if ($k =~ /^env_(\S+)$/) {
$ENV{$1} = $config{$k};
}
}
delete($ENV{'HTTP_AUTHORIZATION'});
$ENV{'HTTP_COOKIE'} =~ s/;?\s*$sidname=([a-f0-9]+)//;
$ENV{'MOBILE_DEVICE'} = 1 if ($mobile_device);
# Check if the CGI can be handled internally
open(CGI, $full);
local $first = <CGI>;
close(CGI);
$first =~ s/[#!\r\n]//g;
$nph_script = ($full =~ /\/nph-([^\/]+)$/);
seek(STDERR, 0, 2);
if (!$config{'forkcgis'} &&
($first eq $perl_path || $first eq $linked_perl_path ||
$first =~ /\/perl$/ || $first =~ /^\/\S+\/env\s+perl$/) &&
$] >= 5.004 ||
$config{'internalcgis'}) {
# setup environment for eval
chdir($ENV{"PWD"});
@ARGV = split(/\s+/, $queryargs);
$0 = $full;
if ($posted_data) {
# Already read the post input
$postinput = $posted_data;
}
$clen = $header{"content-length"};
$SIG{'CHLD'} = 'DEFAULT';
eval {
# Have SOCK closed if the perl exec's something
use Fcntl;
fcntl(SOCK, F_SETFD, FD_CLOEXEC);
};
#shutdown(SOCK, 0);
if ($config{'log'}) {
open(MINISERVLOG, ">>$config{'logfile'}");
if ($config{'logperms'}) {
chmod(oct($config{'logperms'}),
$config{'logfile'});
}
else {
chmod(0600, $config{'logfile'});
}
}
$doing_cgi_eval = 1;
$main_process_id = $$;
$pkg = "main";
if ($full =~ /^\Q$foundroot\E\/([^\/]+)\//) {
# Eval in package from Webmin module name
$pkg = $1;
$pkg =~ s/[^A-Za-z0-9]/_/g;
}
eval "
\%pkg::ENV = \%ENV;
package $pkg;
tie(*STDOUT, 'miniserv');
tie(*STDIN, 'miniserv');
do \$miniserv::full;
die \$@ if (\$@);
";
$doing_cgi_eval = 0;
if ($@) {
# Error in perl!
&http_error(500, "Perl execution failed",
$config{'noshowstderr'} ? undef : "$@");
}
elsif (!$doneheaders && !$nph_script) {
&http_error(500, "Missing Headers");
}
$rv = 0;
}
else {
$infile = undef;
if (!$on_windows) {
# fork the process that actually executes the CGI
pipe(CGIINr, CGIINw);
pipe(CGIOUTr, CGIOUTw);
pipe(CGIERRr, CGIERRw);
if (!($cgipid = fork())) {
@execargs = ( $full, split(/\s+/, $queryargs) );
chdir($ENV{"PWD"});
close(SOCK);
open(STDIN, "<&CGIINr");
open(STDOUT, ">&CGIOUTw");
open(STDERR, ">&CGIERRw");
close(CGIINw); close(CGIOUTr); close(CGIERRr);
exec(@execargs) ||
die "Failed to exec $full : $!\n";
exit(0);
}
close(CGIINr); close(CGIOUTw); close(CGIERRw);
}
else {
# write CGI input to a temp file
$infile = "$config{'tempbase'}.$$";
open(CGIINw, ">$infile");
# NOT binary mode, as CGIs don't read in it!
}
# send post data
if ($posted_data) {
# already read the posted data
print CGIINw $posted_data;
}
$clen = $header{"content-length"};
if ($method eq "POST" && $clen_read < $clen) {
$SIG{'PIPE'} = 'IGNORE';
$got = $clen_read;
while($got < $clen) {
$buf = &read_data($clen-$got);
if (!length($buf)) {
kill('TERM', $cgipid);
unlink($infile) if ($infile);
&http_error(500, "Failed to read ".
"POST request");
}
$got += length($buf);
local ($wrote) = (print CGIINw $buf);
last if (!$wrote);
}
# If the CGI terminated early, we still need to read
# from the browser and throw away
while($got < $clen) {
$buf = &read_data($clen-$got);
if (!length($buf)) {
kill('TERM', $cgipid);
unlink($infile) if ($infile);
&http_error(500, "Failed to read ".
"POST request");
}
$got += length($buf);
}
$SIG{'PIPE'} = 'DEFAULT';
}
close(CGIINw);
shutdown(SOCK, 0);
if ($on_windows) {
# Run the CGI program, and feed it input
chdir($ENV{"PWD"});
local $qqueryargs = join(" ",
map { s/([<>|&"^])/^$1/g; "\"$_\"" }
split(/\s+/, $queryargs));
if ($first =~ /(perl|perl.exe)$/i) {
# On Windows, run with Perl
open(CGIOUTr, "$perl_path \"$full\" $qqueryargs <$infile |");
}
else {
open(CGIOUTr, "\"$full\" $qqueryargs <$infile |");
}
binmode(CGIOUTr);
}
if (!$nph_script) {
# read back cgi headers
select(CGIOUTr); $|=1; select(STDOUT);
$got_blank = 0;
while(1) {
$line = <CGIOUTr>;
$line =~ s/\r|\n//g;
if ($line eq "") {
if ($got_blank || %cgiheader) { last; }
$got_blank++;
next;
}
if ($line !~ /^(\S+):\s+(.*)$/) {
$errs = &read_errors(CGIERRr);
close(CGIOUTr); close(CGIERRr);
unlink($infile) if ($infile);
&http_error(500, "Bad Header", $errs);
}
$cgiheader{lc($1)} = $2;
push(@cgiheader, [ $1, $2 ]);
}
if ($cgiheader{"location"}) {
&write_data("HTTP/1.0 302 Moved Temporarily\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Server: $config{'server'}\r\n");
&write_keep_alive(0);
# ignore the rest of the output. This is a hack,
# but is necessary for IE in some cases :(
close(CGIOUTr); close(CGIERRr);
}
elsif ($cgiheader{"content-type"} eq "") {
close(CGIOUTr); close(CGIERRr);
unlink($infile) if ($infile);
$errs = &read_errors(CGIERRr);
&http_error(500, "Missing Content-Type Header",
$config{'noshowstderr'} ? undef : $errs);
}
else {
&write_data("HTTP/1.0 $ok_code $ok_message\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Server: $config{'server'}\r\n");
&write_keep_alive(0);
}
foreach $h (@cgiheader) {
&write_data("$h->[0]: $h->[1]\r\n");
}
&write_data("\r\n");
}
&reset_byte_count();
while($line = <CGIOUTr>) {
&write_data($line);
}
close(CGIOUTr);
close(CGIERRr);
unlink($infile) if ($infile);
$rv = 0;
}
}
else {
# A file to output
print DEBUG "handle_request: outputting file $full\n";
$gzfile = $full.".gz";
$gzipped = 0;
if ($config{'gzip'} ne '0' && -r $gzfile && $acceptenc{'gzip'}) {
# Using gzipped version
@stopen = stat($gzfile);
if ($stopen[9] >= $stfull[9] && open(FILE, $gzfile)) {
print DEBUG "handle_request: using gzipped $gzfile\n";
$gzipped = 1;
}
}
if (!$gzipped) {
# Using original file
@stopen = @stfull;
open(FILE, $full) || &http_error(404, "Failed to open file");
}
binmode(FILE);
# Build common headers
local $etime = &get_expires_time($simple);
local $resp = "HTTP/1.0 $ok_code $ok_message\r\n".
"Date: $datestr\r\n".
"Server: $config{server}\r\n".
"Content-type: ".&get_type($full)."\r\n".
"Last-Modified: ".&http_date($stopen[9])."\r\n".
"Expires: ".&http_date(time()+$etime)."\r\n".
"Cache-Control: public; max-age=".$etime."\r\n";
if (!$gzipped && $use_gzip && $acceptenc{'gzip'} &&
&should_gzip_file($full)) {
# Load and compress file, then output
print DEBUG "handle_request: outputting gzipped file $full\n";
open(FILE, $full) || &http_error(404, "Failed to open file");
{
local $/ = undef;
$data = <FILE>;
}
close(FILE);
@stopen = stat($file);
$data = Compress::Zlib::memGzip($data);
$resp .= "Content-length: ".length($data)."\r\n".
"Content-Encoding: gzip\r\n";
&write_data($resp);
$rv = &write_keep_alive();
&write_data("\r\n");
&reset_byte_count();
&write_data($data);
}
else {
# Stream file output
$resp .= "Content-length: $stopen[7]\r\n";
$resp .= "Content-Encoding: gzip\r\n" if ($gzipped);
&write_data($resp);
$rv = &write_keep_alive();
&write_data("\r\n");
&reset_byte_count();
my $bufsize = $config{'bufsize'} || 32768;
while(read(FILE, $buf, $bufsize) > 0) {
&write_data($buf);
}
close(FILE);
}
}
# log the request
&log_request($loghost, $authuser, $reqline,
$logged_code ? $logged_code :
$cgiheader{"location"} ? "302" : $ok_code, &byte_count());
return $rv;
}
# http_error(code, message, body, [dontexit], [dontstderr])
# Output an error message to the browser, and log it to the error log
sub http_error
{
my ($code, $msg, $body, $noexit, $noerr) = @_;
local $eh = $error_handler_recurse ? undef :
$config{"error_handler_".$code} ? $config{"error_handler_".$code} :
$config{'error_handler'} ? $config{'error_handler'} : undef;
print DEBUG "http_error code=$code message=$msg body=$body\n";
if ($eh) {
# Call a CGI program for the error
$page = "/$eh";
$querystring = "code=$_[0]&message=".&urlize($msg).
"&body=".&urlize($body);
$error_handler_recurse++;
$ok_code = $code;
$ok_message = $msg;
goto rerun;
}
else {
# Use the standard error message display
&write_data("HTTP/1.0 $code $msg\r\n");
&write_data("Server: $config{server}\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Content-type: text/html; Charset=utf-8\r\n");
&write_keep_alive(0);
&write_data("\r\n");
&reset_byte_count();
&write_data("<html>\n");
&write_data("<head>".&embed_error_styles($roots[0])."<title>$code — $msg</title></head>\n");
&write_data("<body class=\"err-body\"><h2 class=\"err-head\">Error — $msg</h2>\n");
if ($body) {
&write_data("<p class=\"err-content\">$body</p>\n");
}
&write_data("</body></html>\n");
}
&log_request($loghost, $authuser, $reqline, $code, &byte_count())
if ($reqline);
&log_error($msg, $body ? " : $body" : "") if (!$noerr);
shutdown(SOCK, 1);
close(SOCK);
exit if (!$noexit);
}
# embed_error_styles()
# Returns HTML styles for nicer errors. For internal use only.
sub embed_error_styles
{
my ($root) = @_;
if ($root) {
my $err_style = &read_any_file("$root/unauthenticated/errors.css");
if ($err_style) {
$err_style =~ s/[\n\r]//g;
$err_style =~ s/\s+/ /g;
$err_style = "<style data-err type=\"text/css\">$err_style</style>";
return "\n$err_style\n";
}
}
return undef;
}
sub get_type
{
if ($_[0] =~ /\.([A-z0-9]+)$/) {
$t = $mime{$1};
if ($t ne "") {
return $t;
}
}
return "text/plain";
}
# simplify_path(path, bogus)
# Given a path, maybe containing stuff like ".." and "." convert it to a
# clean, absolute form.
sub simplify_path
{
local($dir, @bits, @fixedbits, $b);
$dir = $_[0];
$dir =~ s/\\/\//g; # fix windows \ in path
$dir =~ s/^\/+//g;
$dir =~ s/\/+$//g;
$dir =~ s/\0//g; # remove null bytes
@bits = split(/\/+/, $dir);
@fixedbits = ();
$_[1] = 0;
foreach $b (@bits) {
if ($b eq ".") {
# Do nothing..
}
elsif ($b eq ".." || $b eq "...") {
# Remove last dir
if (scalar(@fixedbits) == 0) {
$_[1] = 1;
return "/";
}
pop(@fixedbits);
}
else {
# Add dir to list
push(@fixedbits, $b);
}
}
return "/" . join('/', @fixedbits);
}
# b64decode(string)
# Converts a string from base64 format to normal
sub b64decode
{
local($str) = $_[0];
local($res);
$str =~ tr|A-Za-z0-9+=/||cd;
$str =~ s/=+$//;
$str =~ tr|A-Za-z0-9+/| -_|;
while ($str =~ /(.{1,60})/gs) {
my $len = chr(32 + length($1)*3/4);
$res .= unpack("u", $len . $1 );
}
return $res;
}
# b64encode(string)
# Encodes a string into base64 format
sub b64encode
{
my ($str) = @_;
my $res;
pos($str) = 0; # ensure start at the beginning
while($str =~ /(.{1,57})/gs) {
$res .= substr(pack('u57', $1), 1);
chop($res);
}
$res =~ tr|\` -_|AA-Za-z0-9+/|;
my $padding = (3 - length($str) % 3) % 3;
$res =~ s/.{$padding}$/'=' x $padding/e if ($padding);
return $res;
}
# ip_match(remoteip, localip, [match]+)
# Checks an IP address against a list of IPs, networks and networks/masks
sub ip_match
{
local(@io, @mo, @ms, $i, $j, $hn, $needhn);
@io = &check_ip6address($_[0]) ? split(/:/, $_[0])
: split(/\./, $_[0]);
for($i=2; $i<@_; $i++) {
$needhn++ if ($_[$i] =~ /^\*(\S+)$/);
}
if ($needhn && !defined($hn = $ip_match_cache{$_[0]})) {
# Reverse-lookup hostname if any rules match based on it
$hn = &to_hostname($_[0]);
if (&check_ip6address($_[0])) {
$hn = "" if (&to_ip6address($hn) ne $_[0]);
}
else {
$hn = "" if (&to_ipaddress($hn) ne $_[0]);
}
$ip_match_cache{$_[0]} = $hn;
}
for($i=2; $i<@_; $i++) {
local $mismatch = 0;
if ($_[$i] =~ /^([0-9\.]+)\/(\d+)$/) {
# Convert CIDR to netmask format
$_[$i] = $1."/".&prefix_to_mask($2);
}
if ($_[$i] =~ /^([0-9\.]+)\/([0-9\.]+)$/) {
# Compare with IPv4 network/mask
@mo = split(/\./, $1);
@ms = split(/\./, $2);
for($j=0; $j<4; $j++) {
if ((int($io[$j]) & int($ms[$j])) != (int($mo[$j]) & int($ms[$j]))) {
$mismatch = 1;
}
}
}
elsif ($_[$i] =~ /^([0-9\.]+)-([0-9\.]+)$/) {
# Compare with an IPv4 range (separated by a hyphen -)
local ($remote, $min, $max);
local @low = split(/\./, $1);
local @high = split(/\./, $2);
for($j=0; $j<4; $j++) {
$remote += $io[$j] << ((3-$j)*8);
$min += $low[$j] << ((3-$j)*8);
$max += $high[$j] << ((3-$j)*8);
}
if ($remote < $min || $remote > $max) {
$mismatch = 1;
}
}
elsif ($_[$i] =~ /^\*(\S+)$/) {
# Compare with hostname regexp
$mismatch = 1 if ($hn !~ /^.*\Q$1\E$/i);
}
elsif ($_[$i] eq 'LOCAL' && &check_ipaddress($_[1])) {
# Compare with local IPv4 network
local @lo = split(/\./, $_[1]);
if ($lo[0] < 128) {
$mismatch = 1 if ($lo[0] != $io[0]);
}
elsif ($lo[0] < 192) {
$mismatch = 1 if ($lo[0] != $io[0] ||
$lo[1] != $io[1]);
}
else {
$mismatch = 1 if ($lo[0] != $io[0] ||
$lo[1] != $io[1] ||
$lo[2] != $io[2]);
}
}
elsif ($_[$i] eq 'LOCAL' && &check_ip6address($_[1])) {
# Compare with local IPv6 network, which is always first 4 words
local @lo = split(/:/, $_[1]);
for(my $i=0; $i<4; $i++) {
$mismatch = 1 if ($lo[$i] ne $io[$i]);
}
}
elsif ($_[$i] =~ /^[0-9\.]+$/) {
# Compare with a full or partial IPv4 address
@mo = split(/\./, $_[$i]);
while(@mo && !$mo[$#mo]) { pop(@mo); }
for($j=0; $j<@mo; $j++) {
if ($mo[$j] != $io[$j]) {
$mismatch = 1;
}
}
}
elsif ($_[$i] =~ /^[a-f0-9:]+$/) {
# Compare with a full IPv6 address
if (&canonicalize_ip6($_[$i]) ne canonicalize_ip6($_[0])) {
$mismatch = 1;
}
}
elsif ($_[$i] =~ /^([a-f0-9:]+)\/(\d+)$/) {
# Compare with an IPv6 network
local $v6size = $2;
local $v6addr = &canonicalize_ip6($1);
local $bytes = $v6size / 8;
@mo = &expand_ipv6_bytes($v6addr);
local @io6 = &expand_ipv6_bytes(&canonicalize_ip6($_[0]));
for($j=0; $j<$bytes; $j++) {
if ($mo[$j] ne $io6[$j]) {
$mismatch = 1;
}
}
}
elsif ($_[$i] !~ /^[0-9\.]+$/) {
# Compare with hostname
$mismatch = 1 if ($_[0] ne &to_ipaddress($_[$i]));
}
return 1 if (!$mismatch);
}
return 0;
}
# users_match(&uinfo, user, ...)
# Returns 1 if a user is in a list of users and groups
sub users_match
{
local $uinfo = shift(@_);
local $u;
local @ginfo = getgrgid($uinfo->[3]);
foreach $u (@_) {
if ($u =~ /^\@(\S+)$/) {
return 1 if (&is_group_member($uinfo, $1));
}
elsif ($u =~ /^(\d*)-(\d*)$/ && ($1 || $2)) {
return (!$1 || $uinfo[2] >= $1) &&
(!$2 || $uinfo[2] <= $2);
}
else {
return 1 if ($u eq $uinfo->[0]);
}
}
return 0;
}
# restart_miniserv()
# Called when a SIGHUP is received to restart the web server. This is done
# by exec()ing perl with the same command line as was originally used
sub restart_miniserv
{
&log_error("Restarting");
close(SOCK);
&close_all_sockets();
&close_all_pipes();
dbmclose(%sessiondb);
kill('KILL', $logclearer) if ($logclearer);
kill('KILL', $extauth) if ($extauth);
if (&indexof("--nofork", @miniserv_argv) < 0) {
unshift(@miniserv_argv, "--nofork");
}
exec($perl_path, $miniserv_path, @miniserv_argv);
die "Failed to restart miniserv with $perl_path $miniserv_path";
}
sub trigger_restart
{
$need_restart = 1;
}
sub trigger_reload
{
$need_reload = 1;
}
# to_ip46address(address, ...)
# Convert hostnames to v4 and v6 addresses, if possible
sub to_ip46address
{
local @rv;
foreach my $i (@_) {
if (&check_ipaddress($i) || &check_ip6address($i)) {
push(@rv, $i);
}
else {
my $addr = &to_ipaddress($i);
$addr ||= &to_ip6address($i);
push(@rv, $addr) if ($addr);
}
}
return @rv;
}
# to_ipaddress(address, ...)
sub to_ipaddress
{
local (@rv, $i);
foreach $i (@_) {
if ($i =~ /(\S+)\/(\S+)/ || $i =~ /^\*\S+$/ ||
$i eq 'LOCAL' || $i =~ /^[0-9\.]+$/ || $i =~ /^[a-f0-9:]+$/) {
# A pattern or IP, not a hostname, so don't change
push(@rv, $i);
}
else {
# Lookup IP address
push(@rv, join('.', unpack("CCCC", inet_aton($i))));
}
}
return wantarray ? @rv : $rv[0];
}
# to_ip6address(address, ...)
sub to_ip6address
{
local (@rv, $i);
foreach $i (@_) {
if ($i =~ /(\S+)\/(\S+)/ || $i =~ /^\*\S+$/ ||
$i eq 'LOCAL' || $i =~ /^[0-9\.]+$/ || $i =~ /^[a-f0-9:]+$/) {
# A pattern, not a hostname, so don't change
push(@rv, $i);
}
elsif ($config{'ipv6'}) {
# Lookup IPv6 address
local ($inaddr, $addr);
eval {
(undef, undef, undef, $inaddr) =
getaddrinfo($i, undef, AF_INET6(), SOCK_STREAM);
};
if ($inaddr) {
push(@rv, undef);
}
else {
(undef, $addr) = unpack_sockaddr_in6($inaddr);
push(@rv, inet_ntop(AF_INET6(), $addr));
}
}
}
return wantarray ? @rv : $rv[0];
}
# to_hostname(ipv4|ipv6-address)
# Reverse-resolves an IPv4 or 6 address to a hostname
sub to_hostname
{
local ($addr) = @_;
if (&check_ip6address($_[0])) {
return gethostbyaddr(inet_pton(AF_INET6(), $addr),
AF_INET6());
}
else {
return gethostbyaddr(inet_aton($addr), AF_INET);
}
}
# read_line(no-wait, no-limit)
# Reads one line from SOCK or SSL
sub read_line
{
local ($nowait, $nolimit) = @_;
local($idx, $more, $rv);
while(($idx = index($main::read_buffer, "\n")) < 0) {
if (length($main::read_buffer) > 100000 && !$nolimit) {
&http_error(414, "Request too long",
"Received excessive line <pre class=\"err-content\">".&html_strip($main::read_buffer)."</pre>");
}
# need to read more..
&wait_for_data_error() if (!$nowait);
if ($use_ssl) {
$more = Net::SSLeay::read($ssl_con);
}
else {
my $bufsize = $config{'bufsize'} || 32768;
local $ok = sysread(SOCK, $more, $bufsize);
$more = undef if ($ok <= 0);
}
if ($more eq '') {
# end of the data
$rv = $main::read_buffer;
undef($main::read_buffer);
return $rv;
}
$main::read_buffer .= $more;
}
$rv = substr($main::read_buffer, 0, $idx+1);
$main::read_buffer = substr($main::read_buffer, $idx+1);
return $rv;
}
# read_data(length)
# Reads up to some amount of data from SOCK or the SSL connection
sub read_data
{
local ($rv);
if (length($main::read_buffer)) {
if (length($main::read_buffer) > $_[0]) {
# Return the first part of the buffer
$rv = substr($main::read_buffer, 0, $_[0]);
$main::read_buffer = substr($main::read_buffer, $_[0]);
return $rv;
}
else {
# Return the whole buffer
$rv = $main::read_buffer;
undef($main::read_buffer);
return $rv;
}
}
elsif ($use_ssl) {
# Call SSL read function
return Net::SSLeay::read($ssl_con, $_[0]);
}
else {
# Just do a normal read
local $buf;
sysread(SOCK, $buf, $_[0]) || return undef;
return $buf;
}
}
# wait_for_data(secs)
# Waits at most the given amount of time for some data on SOCK, returning
# 0 if not found, 1 if some arrived.
sub wait_for_data
{
local $rmask;
vec($rmask, fileno(SOCK), 1) = 1;
local $got = select($rmask, undef, undef, $_[0]);
return $got == 0 ? 0 : 1;
}
# wait_for_data_error()
# Waits 60 seconds for data on SOCK, and fails if none arrives
sub wait_for_data_error
{
local $got = &wait_for_data(60);
if (!$got) {
&http_error(400, "Timeout",
"Waited more than 60 seconds for request data");
}
}
# write_data(data, ...)
# Writes a string to SOCK or the SSL connection
sub write_data
{
local $str = join("", @_);
if ($use_ssl) {
Net::SSLeay::write($ssl_con, $str);
}
else {
eval { syswrite(SOCK, $str, length($str)); };
if ($@ =~ /wide\s+character/i) {
eval { utf8::encode($str);
syswrite(SOCK, $str, length($str)); };
}
if ($@) {
# Somehow a string come through that contains invalid chars
print STDERR $@,"\n";
for(my $i=0; my @stack = caller($i); $i++) {
print STDERR join(" ", @stack),"\n";
}
}
}
$write_data_count += length($str);
}
# reset_byte_count()
sub reset_byte_count { $write_data_count = 0; }
# byte_count()
sub byte_count { return $write_data_count; }
# log_request(hostname, user, request, code, bytes)
# Write an HTTP request to the log file
sub log_request
{
local ($host, $user, $request, $code, $bytes) = @_;
local $headers;
my $request_nolog = $request;
# Process full request string like `POST /index.cgi?param=1 HTTP/1.1` as well
if ($request =~ /^(POST|GET)\s+/) {
$request_nolog =~ s/(.*?)(\/.*?)\s+(.*)/$2/g;
}
if ($config{'nolog'}) {
foreach my $nolog (split(/\s+/, $config{'nolog'})) {
return if ($request_nolog =~ /^$nolog$/);
}
}
if ($config{'log'}) {
local $ident = "-";
$user ||= "-";
local $dstr = &make_datestr();
if (fileno(MINISERVLOG)) {
seek(MINISERVLOG, 0, 2);
}
else {
open(MINISERVLOG, ">>$config{'logfile'}");
chmod(0600, $config{'logfile'});
}
if (defined($config{'logheaders'})) {
foreach $h (split(/\s+/, $config{'logheaders'})) {
$headers .= " $h=\"$header{$h}\"";
}
}
elsif ($config{'logclf'}) {
$headers = " \"$header{'referer'}\" \"$header{'user-agent'}\"";
}
else {
$headers = "";
}
print MINISERVLOG "$host $ident $user [$dstr] \"$request\" ",
"$code $bytes$headers\n";
close(MINISERVLOG);
}
}
# make_datestr()
sub make_datestr
{
local @tm = localtime(time());
return sprintf "%2.2d/%s/%4.4d:%2.2d:%2.2d:%2.2d %s",
$tm[3], $month[$tm[4]], $tm[5]+1900,
$tm[2], $tm[1], $tm[0], $timezone;
}
# log_error(message)
sub log_error
{
seek(STDERR, 0, 2);
print STDERR "[",&make_datestr(),"] ",
$acpthost ? ( "[",$acpthost,"] " ) : ( ),
$page ? ( $page," : " ) : ( ),
@_,"\n";
}
# read_errors(handle)
# Read and return all input from some filehandle
sub read_errors
{
local($fh, $_, $rv);
$fh = $_[0];
while(<$fh>) { $rv .= $_; }
return $rv;
}
sub write_keep_alive
{
local $mode;
if ($config{'nokeepalive'}) {
# Keep alives have been disabled in config
$mode = 0;
}
elsif (@childpids > $config{'maxconns'}*.8) {
# Disable because nearing process limit
$mode = 0;
}
elsif (@_) {
# Keep alive specified by caller
$mode = $_[0];
}
else {
# Keep alive determined by browser
$mode = $header{'connection'} =~ /keep-alive/i;
}
&write_data("Connection: ".($mode ? "Keep-Alive" : "close")."\r\n");
return $mode;
}
sub term_handler
{
&log_error("Shutting down");
kill('TERM', @childpids) if (@childpids);
kill('KILL', $logclearer) if ($logclearer);
kill('KILL', $extauth) if ($extauth);
exit(1);
}
sub http_date
{
local @tm = gmtime($_[0]);
return sprintf "%s, %d %s %d %2.2d:%2.2d:%2.2d GMT",
$weekday[$tm[6]], $tm[3], $month[$tm[4]], $tm[5]+1900,
$tm[2], $tm[1], $tm[0];
}
sub TIEHANDLE
{
my $i; bless \$i, shift;
}
sub WRITE
{
$r = shift;
my($buf,$len,$offset) = @_;
&write_to_sock(substr($buf, $offset, $len));
$miniserv::page_capture_out .= substr($buf, $offset, $len)
if ($miniserv::page_capture);
}
sub PRINT
{
$r = shift;
$$r++;
my $buf = join(defined($,) ? $, : "", @_);
$buf .= $\ if defined($\);
&write_to_sock($buf);
$miniserv::page_capture_out .= $buf
if ($miniserv::page_capture);
}
sub PRINTF
{
shift;
my $fmt = shift;
my $buf = sprintf $fmt, @_;
&write_to_sock($buf);
$miniserv::page_capture_out .= $buf
if ($miniserv::page_capture);
}
# Send back already read data while we have it, then read from SOCK
sub READ
{
my $r = shift;
my $bufref = \$_[0];
my $len = $_[1];
my $offset = $_[2];
if ($postpos < length($postinput)) {
# Reading from already fetched array
my $left = length($postinput) - $postpos;
my $canread = $len > $left ? $left : $len;
substr($$bufref, $offset, $canread) =
substr($postinput, $postpos, $canread);
$postpos += $canread;
return $canread;
}
else {
# Read from network socket
local $data = &read_data($len);
if ($data eq '' && $len) {
# End of socket
shutdown(SOCK, 0);
}
substr($$bufref, $offset, length($data)) = $data;
return length($data);
}
}
sub OPEN
{
#print STDERR "open() called - should never happen!\n";
}
# Read a line of input
sub READLINE
{
my $r = shift;
if ($postpos < length($postinput) &&
($idx = index($postinput, "\n", $postpos)) >= 0) {
# A line exists in the memory buffer .. use it
my $line = substr($postinput, $postpos, $idx-$postpos+1);
$postpos = $idx+1;
return $line;
}
else {
# Need to read from the socket
my $line;
if ($postpos < length($postinput)) {
# Start with in-memory data
$line = substr($postinput, $postpos);
$postpos = length($postinput);
}
my $nl = &read_line(0, 1);
if ($nl eq '') {
# End of socket
shutdown(SOCK, 0);
}
$line .= $nl if (defined($nl));
return $line;
}
}
# Read one character of input
sub GETC
{
my $r = shift;
my $buf;
my $got = READ($r, \$buf, 1, 0);
return $got > 0 ? $buf : undef;
}
sub FILENO
{
return fileno(SOCK);
}
sub CLOSE { }
sub DESTROY { }
# write_to_sock(data, ...)
sub write_to_sock
{
local $d;
foreach $d (@_) {
if ($doneheaders || $miniserv::nph_script) {
&write_data($d);
}
else {
$headers .= $d;
while(!$doneheaders && $headers =~ s/^([^\r\n]*)(\r)?\n//) {
if ($1 =~ /^(\S+):\s+(.*)$/) {
$cgiheader{lc($1)} = $2;
push(@cgiheader, [ $1, $2 ]);
}
elsif ($1 !~ /\S/) {
$doneheaders++;
}
else {
&http_error(500, "Bad Header");
}
}
if ($doneheaders) {
if ($cgiheader{"location"}) {
&write_data(
"HTTP/1.0 302 Moved Temporarily\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Server: $config{server}\r\n");
&write_keep_alive(0);
}
elsif ($cgiheader{"content-type"} eq "") {
&http_error(500, "Missing Content-Type Header");
}
else {
&write_data("HTTP/1.0 $ok_code $ok_message\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Server: $config{server}\r\n");
&write_keep_alive(0);
}
foreach $h (@cgiheader) {
&write_data("$h->[0]: $h->[1]\r\n");
}
&write_data("\r\n");
&reset_byte_count();
&write_data($headers);
}
}
}
}
sub verify_client
{
local $cert = Net::SSLeay::X509_STORE_CTX_get_current_cert($_[1]);
if ($cert) {
local $errnum = Net::SSLeay::X509_STORE_CTX_get_error($_[1]);
$verified_client = 1 if (!$errnum);
}
return 1;
}
sub END
{
if ($doing_cgi_eval && $$ == $main_process_id) {
# A CGI program called exit! This is a horrible hack to
# finish up before really exiting
shutdown(SOCK, 1);
close(SOCK);
close($PASSINw); close($PASSOUTw);
&log_request($loghost, $authuser, $reqline,
$cgiheader{"location"} ? "302" : $ok_code, &byte_count());
}
}
# urlize
# Convert a string to a form ok for putting in a URL
sub urlize {
local($tmp, $tmp2, $c);
$tmp = $_[0];
$tmp2 = "";
while(($c = chop($tmp)) ne "") {
if ($c !~ /[A-z0-9]/) {
$c = sprintf("%%%2.2X", ord($c));
}
$tmp2 = $c . $tmp2;
}
return $tmp2;
}
# validate_user(username, password, host, remote-ip, webmin-port)
# Checks if some username and password are valid. Returns the modified username,
# the expired / temp pass flag, the non-existence flag, and the underlying
# Webmin username.
sub validate_user
{
local ($user, $pass, $host, $actpip, $port) = @_;
return ( ) if (!$user);
print DEBUG "validate_user: user=$user pass=$pass host=$host\n";
local ($canuser, $canmode, $notexist, $webminuser, $sudo) =
&can_user_login($user, undef, $host);
print DEBUG "validate_user: canuser=$canuser canmode=$canmode notexist=$notexist webminuser=$webminuser sudo=$sudo\n";
if ($notexist) {
# User doesn't even exist, so go no further
return ( undef, 0, 1, $webminuser );
}
elsif ($canmode == 0) {
# User does exist but cannot login
return ( $canuser, 0, 0, $webminuser );
}
elsif ($canmode == 1) {
# Attempt Webmin authentication
my $uinfo = &get_user_details($webminuser, $canuser);
if ($uinfo &&
&password_crypt($pass, $uinfo->{'pass'}) eq $uinfo->{'pass'}) {
# Password is valid .. but check for expiry
local $lc = $uinfo->{'lastchanges'};
print DEBUG "validate_user: Password is valid lc=$lc pass_maxdays=$config{'pass_maxdays'}\n";
if ($config{'pass_maxdays'} && $lc && !$uinfo->{'nochange'}) {
local $daysold = (time() - $lc)/(24*60*60);
print DEBUG "maxdays=$config{'pass_maxdays'} daysold=$daysold temppass=$uinfo->{'temppass'}\n";
if ($config{'pass_lockdays'} &&
$daysold > $config{'pass_lockdays'}) {
# So old that the account is locked
return ( undef, 0, 0, $webminuser );
}
elsif ($daysold > $config{'pass_maxdays'}) {
# Password has expired
return ( $user, 1, 0, $webminuser );
}
}
if ($uinfo->{'temppass'}) {
# Temporary password - force change now
return ( $user, 2, 0, $webminuser );
}
return ( $user, 0, 0, $webminuser );
}
elsif (!$uinfo) {
print DEBUG "validate_user: User $webminuser not found\n";
return ( undef, 0, 0, $webminuser );
}
else {
print DEBUG "validate_user: User $webminuser password mismatch $pass != $uinfo->{'pass'}\n";
return ( undef, 0, 0, $webminuser );
}
}
elsif ($canmode == 2 || $canmode == 3) {
# Attempt PAM or passwd file authentication
local $val = &validate_unix_user($canuser, $pass, $acptip, $port);
print DEBUG "validate_user: unix val=$val\n";
if ($val && $sudo) {
# Need to check if this Unix user can sudo
if (!&check_sudo_permissions($canuser, $pass)) {
print DEBUG "validate_user: sudo failed\n";
$val = 0;
}
else {
print DEBUG "validate_user: sudo passed\n";
}
}
return $val == 2 ? ( $canuser, 1, 0, $webminuser ) :
$val == 1 ? ( $canuser, 0, 0, $webminuser ) :
( undef, 0, 0, $webminuser );
}
elsif ($canmode == 4) {
# Attempt external authentication
return &validate_external_user($canuser, $pass) ?
( $canuser, 0, 0, $webminuser ) :
( undef, 0, 0, $webminuser );
}
else {
# Can't happen!
return ( );
}
}
# validate_unix_user(user, password, remote-ip, local-port)
# Returns 1 if a username and password are valid under unix, 0 if not,
# or 2 if the account has expired.
# Checks PAM if available, and falls back to reading the system password
# file otherwise.
sub validate_unix_user
{
if ($use_pam) {
# Check with PAM
$pam_username = $_[0];
$pam_password = $_[1];
eval "use Authen::PAM;";
local $pamh = new Authen::PAM($config{'pam'}, $pam_username,
\&pam_conv_func);
if (ref($pamh)) {
$pamh->pam_set_item(PAM_RHOST(), $_[2]) if ($_[2]);
$pamh->pam_set_item(PAM_TTY(), $_[3]) if ($_[3]);
local $rcode = 0;
local $pam_ret = $pamh->pam_authenticate();
if ($pam_ret == PAM_SUCCESS()) {
# Logged in OK .. make sure password hasn't expired
local $acct_ret = $pamh->pam_acct_mgmt();
$pam_ret = $acct_ret;
if ($acct_ret == PAM_SUCCESS()) {
$pamh->pam_open_session();
$rcode = 1;
}
elsif ($acct_ret == PAM_NEW_AUTHTOK_REQD() ||
$acct_ret == PAM_ACCT_EXPIRED()) {
$rcode = 2;
}
else {
print STDERR "Unknown pam_acct_mgmt return value : $acct_ret\n";
$rcode = 0;
}
}
if ($config{'pam_end'}) {
$pamh->pam_end($pam_ret);
}
return $rcode;
}
}
elsif ($config{'pam_only'}) {
# Pam is not available, but configuration forces it's use!
return 0;
}
elsif ($config{'passwd_file'}) {
# Check in a password file
local $rv = 0;
open(FILE, $config{'passwd_file'});
if ($config{'passwd_file'} eq '/etc/security/passwd') {
# Assume in AIX format
while(<FILE>) {
s/\s*$//;
if (/^\s*(\S+):/ && $1 eq $_[0]) {
$_ = <FILE>;
if (/^\s*password\s*=\s*(\S+)\s*$/) {
$rv = $1 eq &password_crypt($_[1], $1) ?
1 : 0;
}
last;
}
}
}
else {
# Read the system password or shadow file
while(<FILE>) {
local @l = split(/:/, $_, -1);
local $u = $l[$config{'passwd_uindex'}];
local $p = $l[$config{'passwd_pindex'}];
if ($u eq $_[0]) {
$rv = $p eq &password_crypt($_[1], $p) ? 1 : 0;
if ($config{'passwd_cindex'} ne '' && $rv) {
# Password may have expired!
local $c = $l[$config{'passwd_cindex'}];
local $m = $l[$config{'passwd_mindex'}];
local $day = time()/(24*60*60);
if ($c =~ /^\d+/ && $m =~ /^\d+/ &&
$day - $c > $m) {
# Yep, it has ..
$rv = 2;
}
}
if ($p eq "" && $config{'passwd_blank'}) {
# Force password change
$rv = 2;
}
last;
}
}
}
close(FILE);
return $rv if ($rv);
}
# Fallback option - check password returned by getpw*
local @uinfo = getpwnam($_[0]);
if ($uinfo[1] ne '' && &password_crypt($_[1], $uinfo[1]) eq $uinfo[1]) {
return 1;
}
return 0; # Totally failed
}
# validate_external_user(user, pass)
# Validate a user by passing the username and password to an external
# squid-style authentication program
sub validate_external_user
{
return 0 if (!$config{'extauth'});
flock(EXTAUTH, 2);
local $str = "$_[0] $_[1]\n";
syswrite(EXTAUTH, $str, length($str));
local $resp = <EXTAUTH>;
flock(EXTAUTH, 8);
return $resp =~ /^OK/i ? 1 : 0;
}
# can_user_login(username, no-append, host)
# Checks if a user can login or not.
# First return value is the username.
# Second is 0 if cannot login, 1 if using Webmin pass, 2 if PAM, 3 if password
# file, 4 if external.
# Third is 1 if the user does not exist at all, 0 if he does.
# Fourth is the Webmin username whose permissions apply, based on unixauth.
# Fifth is a flag indicating if a sudo check is needed.
sub can_user_login
{
local $uinfo = &get_user_details($_[0]);
if (!$uinfo) {
# See if this user exists in Unix and can be validated by the same
# method as the unixauth webmin user
local $realuser = $unixauth{$_[0]};
local @uinfo;
local $sudo = 0;
local $pamany = 0;
eval { @uinfo = getpwnam($_[0]); }; # may fail on windows
if (!$realuser && @uinfo) {
# No unixauth entry for the username .. try his groups
foreach my $ua (keys %unixauth) {
if ($ua =~ /^\@(.*)$/) {
if (&is_group_member(\@uinfo, $1)) {
$realuser = $unixauth{$ua};
last;
}
}
}
}
if (!$realuser && @uinfo) {
# Fall back to unix auth for all Unix users
$realuser = $unixauth{"*"};
}
if (!$realuser && $use_sudo && @uinfo) {
# Allow login effectively as root, if sudo permits it
$sudo = 1;
$realuser = "root";
}
if (!$realuser && !@uinfo && $config{'pamany'}) {
# If the user completely doesn't exist, we can still allow
# him to authenticate via PAM
$realuser = $config{'pamany'};
$pamany = 1;
}
if (!$realuser) {
# For Usermin, always fall back to unix auth for any user,
# so that later checks with domain added / removed are done.
$realuser = $unixauth{"*"};
}
return (undef, 0, 1, undef) if (!$realuser);
local $uinfo = &get_user_details($realuser);
return (undef, 0, 1, undef) if (!$uinfo);
local $up = $uinfo->{'pass'};
# Work out possible domain names from the hostname
local @doms = ( $_[2] );
if ($_[2] =~ /^([^\.]+)\.(\S+)$/) {
push(@doms, $2);
}
if ($config{'user_mapping'} && !%user_mapping) {
# Read the user mapping file
%user_mapping = ();
open(MAPPING, $config{'user_mapping'});
while(<MAPPING>) {
s/\r|\n//g;
s/#.*$//;
if (/^(\S+)\s+(\S+)/) {
my ($from, $to) = ($1, $2);
$from =~ s/\\(.)/$1/g;
$to =~ s/\\(.)/$1/g;
if ($config{'user_mapping_reverse'}) {
$user_mapping{$from} = $to;
}
else {
$user_mapping{$to} = $from;
}
}
}
close(MAPPING);
}
# Check the user mapping file to see if there is an entry for the
# user login in which specifies a new effective user
local $um;
foreach my $d (@doms) {
$um ||= $user_mapping{"$_[0]\@$d"};
}
$um ||= $user_mapping{$_[0]};
if (defined($um) && ($_[1]&4) == 0) {
# A mapping exists - use it!
return &can_user_login($um, $_[1]+4, $_[2]);
}
# Check if a user with the entered login and the domains appended
# or prepended exists, and if so take it to be the effective user
if (!@uinfo && $config{'domainuser'}) {
# Try again with name.domain and name.firstpart
local @firsts = map { /^([^\.]+)/; $1 } @doms;
if (($_[1]&1) == 0) {
local ($a, $p);
foreach $a (@firsts, @doms) {
foreach $p ("$_[0].${a}", "$_[0]-${a}",
"${a}.$_[0]", "${a}-$_[0]",
"$_[0]_${a}", "${a}_$_[0]") {
local @vu = &can_user_login(
$p, $_[1]+1, $_[2]);
return @vu if ($vu[1]);
}
}
}
}
# Check if the user entered a domain at the end of his username when
# he really shouldn't have, and if so try without it
if (!@uinfo && $config{'domainstrip'} &&
$_[0] =~ /^(\S+)\@(\S+)$/ && ($_[1]&2) == 0) {
local ($stripped, $dom) = ($1, $2);
local @vu = &can_user_login($stripped, $_[1] + 2, $_[2]);
return @vu if ($vu[1]);
local @vu = &can_user_login($stripped, $_[1] + 2, $dom);
return @vu if ($vu[1]);
}
return ( undef, 0, 1, undef ) if (!@uinfo && !$pamany);
if (@uinfo) {
if (scalar(@allowusers)) {
# Only allow people on the allow list
return ( undef, 0, 0, undef )
if (!&users_match(\@uinfo, @allowusers));
}
elsif (scalar(@denyusers)) {
# Disallow people on the deny list
return ( undef, 0, 0, undef )
if (&users_match(\@uinfo, @denyusers));
}
if ($config{'shells_deny'}) {
local $found = 0;
open(SHELLS, $config{'shells_deny'});
while(<SHELLS>) {
s/\r|\n//g;
s/#.*$//;
$found++ if ($_ eq $uinfo[8]);
}
close(SHELLS);
return ( undef, 0, 0, undef ) if (!$found);
}
}
if ($up eq 'x') {
# PAM or passwd file authentication
print DEBUG "can_user_login: Validate with PAM\n";
return ( $_[0], $use_pam ? 2 : 3, 0, $realuser, $sudo );
}
elsif ($up eq 'e') {
# External authentication
print DEBUG "can_user_login: Validate externally\n";
return ( $_[0], 4, 0, $realuser, $sudo );
}
else {
# Fixed Webmin password
print DEBUG "can_user_login: Validate by Webmin\n";
return ( $_[0], 1, 0, $realuser, $sudo );
}
}
elsif ($uinfo->{'pass'} eq 'x') {
# Webmin user authenticated via PAM or password file
return ( $_[0], $use_pam ? 2 : 3, 0, $_[0] );
}
elsif ($uinfo->{'pass'} eq 'e') {
# Webmin user authenticated externally
return ( $_[0], 4, 0, $_[0] );
}
else {
# Normal Webmin user
return ( $_[0], 1, 0, $_[0] );
}
}
# the PAM conversation function for interactive logins
sub pam_conv_func
{
$pam_conv_func_called++;
my @res;
while ( @_ ) {
my $code = shift;
my $msg = shift;
my $ans = "";
$ans = $pam_username if ($code == PAM_PROMPT_ECHO_ON() );
$ans = $pam_password if ($code == PAM_PROMPT_ECHO_OFF() );
push @res, PAM_SUCCESS();
push @res, $ans;
}
push @res, PAM_SUCCESS();
return @res;
}
sub urandom_timeout
{
close(RANDOM);
}
# get_socket_ip(handle, ipv6-flag)
# Returns the local IP address of some connection, as both a string and in
# binary format
sub get_socket_ip
{
local ($fh, $ipv6) = @_;
local $sn = getsockname($fh);
return undef if (!$sn);
return &get_address_ip($sn, $ipv6);
}
# get_address_ip(address, ipv6-flag)
# Given a sockaddr object in binary format, return the binary address, text
# address and port number
sub get_address_ip
{
local ($sn, $ipv6) = @_;
if ($ipv6) {
local ($p, $b) = unpack_sockaddr_in6($sn);
return ($b, inet_ntop(AF_INET6(), $b), $p);
}
else {
local ($p, $b) = unpack_sockaddr_in($sn);
return ($b, inet_ntoa($b), $p);
}
}
# get_socket_name(handle, ipv6-flag)
# Returns the local hostname or IP address of some connection
sub get_socket_name
{
local ($fh, $ipv6) = @_;
return $config{'host'} if ($config{'host'});
local ($mybin, $myaddr) = &get_socket_ip($fh, $ipv6);
if (!$get_socket_name_cache{$myaddr}) {
local $myname;
if (!$config{'no_resolv_myname'}) {
$myname = gethostbyaddr($mybin,
$ipv6 ? AF_INET6() : AF_INET);
}
$myname ||= $myaddr;
$get_socket_name_cache{$myaddr} = $myname;
}
return $get_socket_name_cache{$myaddr};
}
# run_login_script(username, sid, remoteip, localip)
sub run_login_script
{
if ($config{'login_script'}) {
alarm(5);
$SIG{'ALRM'} = sub { die "timeout" };
eval {
system($config{'login_script'}.
" ".join(" ", map { quotemeta($_) || '""' } @_).
" >/dev/null 2>&1 </dev/null");
};
alarm(0);
}
}
# run_logout_script(username, sid, remoteip, localip)
sub run_logout_script
{
if ($config{'logout_script'}) {
alarm(5);
$SIG{'ALRM'} = sub { die "timeout" };
eval {
system($config{'logout_script'}.
" ".join(" ", map { quotemeta($_) || '""' } @_).
" >/dev/null 2>&1 </dev/null");
};
alarm(0);
}
}
# run_failed_script(username, reason-code, remoteip, localip)
sub run_failed_script
{
if ($config{'failed_script'}) {
$_[0] =~ s/\r|\n/ /g;
alarm(5);
$SIG{'ALRM'} = sub { die "timeout" };
eval {
system($config{'failed_script'}.
" ".join(" ", map { quotemeta($_) || '""' } @_).
" >/dev/null 2>&1 </dev/null");
};
alarm(0);
}
}
# close_all_sockets()
# Closes all the main listening sockets
sub close_all_sockets
{
local $s;
foreach $s (@socketfhs) {
close($s);
}
}
# close_all_pipes()
# Close all pipes for talking to sub-processes
sub close_all_pipes
{
local $p;
foreach $p (@passin) { close($p); }
foreach $p (@passout) { close($p); }
foreach $p (values %conversations) {
if ($p->{'PAMOUTr'}) {
close($p->{'PAMOUTr'});
close($p->{'PAMINw'});
}
}
}
# check_user_ip(user)
# Returns 1 if some user is allowed to login from the accepting IP, 0 if not
sub check_user_ip
{
local ($username) = @_;
local $uinfo = &get_user_details($username);
return 1 if (!$uinfo);
if ($uinfo->{'deny'} &&
&ip_match($acptip, $localip, @{$uinfo->{'deny'}}) ||
$uinfo->{'allow'} &&
!&ip_match($acptip, $localip, @{$uinfo->{'allow'}})) {
return 0;
}
return 1;
}
# check_user_time(user)
# Returns 1 if some user is allowed to login at the current date and time
sub check_user_time
{
local ($username) = @_;
local $uinfo = &get_user_details($username);
return 1 if (!$uinfo || !$uinfo->{'allowdays'} && !$uinfo->{'allowhours'});
local @tm = localtime(time());
if ($uinfo->{'allowdays'}) {
# Make sure day is allowed
return 0 if (&indexof($tm[6], @{$uinfo->{'allowdays'}}) < 0);
}
if ($uinfo->{'allowhours'}) {
# Make sure time is allowed
local $m = $tm[2]*60+$tm[1];
return 0 if ($m < $uinfo->{'allowhours'}->[0] ||
$m > $uinfo->{'allowhours'}->[1]);
}
return 1;
}
# generate_random_id(password, [force-urandom])
# Returns a random session ID number
sub generate_random_id
{
my ($force_urandom) = @_;
local $sid;
if (!$bad_urandom) {
# First try /dev/urandom, unless we have marked it as bad
$SIG{ALRM} = "miniserv::urandom_timeout";
alarm(5);
if (open(RANDOM, "/dev/urandom")) {
my $tmpsid;
if (read(RANDOM, $tmpsid, 16) == 16) {
$sid = lc(unpack('h*',$tmpsid));
if ($sid !~ /^[0-9a-fA-F]{32}$/) {
$sid = 'bad';
}
}
close(RANDOM);
}
alarm(0);
}
if (!$sid && !$force_urandom) {
my $offset = int(rand(2048));
my @charset = ('0' ..'9', 'a' .. 'f');
$sid = join('', map { $charset[rand(@charset)] } 1 .. 4096);
$sid = substr($sid, $offset, 32);
}
return $sid;
}
# handle_login(username, ok, expired, not-exists, password, [no-test-cookie], [no-log])
# Called from handle_session to either mark a user as logged in, or not
sub handle_login
{
local ($vu, $ok, $expired, $nonexist, $pass, $notest, $nolog) = @_;
$authuser = $vu if ($ok);
# check if the test cookie is set
if ($header{'cookie'} !~ /testing=1/ && $vu &&
!$config{'no_testing_cookie'} && !$notest) {
&http_error(500, "Cache issue or no cookies support",
"Please clear your browser's cache for the given ".
"domain and/or try incognito tab; double check ".
"to have cookies support enabled.");
}
# check with main process for delay
if ($config{'passdelay'} && $vu) {
print DEBUG "handle_login: requesting delay vu=$vu acptip=$acptip ok=$ok\n";
print $PASSINw "delay $vu $acptip $ok $nolog\n";
<$PASSOUTr> =~ /(\d+) (\d+)/;
$blocked = $2;
sleep($1);
print DEBUG "handle_login: delay=$1 blocked=$2\n";
}
if ($ok && (!$expired ||
$config{'passwd_mode'} == 1)) {
# Logged in OK! Tell the main process about
# the new SID
local $sid = &generate_random_id();
print DEBUG "handle_login: sid=$sid\n";
print $PASSINw "new $sid $authuser $acptip\n";
# Run the post-login script, if any
&run_login_script($authuser, $sid,
$loghost, $localip);
# Check for a redirect URL for the user
local $rurl = &login_redirect($authuser, $pass, $host);
print DEBUG "handle_login: redirect URL rurl=$rurl\n";
if ($rurl) {
# Got one .. go to it
&write_data("HTTP/1.0 302 Moved Temporarily\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Server: $config{'server'}\r\n");
&write_data("Location: $rurl\r\n");
&write_keep_alive(0);
&write_data("\r\n");
&log_request($loghost, $authuser, $reqline, 302, 0);
}
else {
# Set cookie and redirect to originally requested page
&write_data("HTTP/1.0 302 Moved Temporarily\r\n");
&write_data("Date: $datestr\r\n");
&write_data("Server: $config{'server'}\r\n");
local $sec = $ssl ? "; secure" : "";
if (!$config{'no_httponly'}) {
$sec .= "; httpOnly";
}
if ($in{'page'} !~ /^\/[A-Za-z0-9\/\.\-\_:]+$/) {
# Make redirect URL safe
$in{'page'} = "/";
}
local $cpath = $config{'cookiepath'};
if ($in{'save'}) {
&write_data("Set-Cookie: $sidname=$sid; path=$cpath; ".
"expires=\"Thu, 31-Dec-2037 00:00:00\"$sec\r\n");
}
else {
&write_data("Set-Cookie: $sidname=$sid; path=$cpath".
"$sec\r\n");
}
&write_data("Location: $prot://$hostport$in{'page'}\r\n");
&write_keep_alive(0);
&write_data("\r\n");
&log_request($loghost, $authuser, $reqline, 302, 0);
syslog("info", "%s", "Successful login as $authuser from $loghost") if ($use_syslog);
&write_login_utmp($authuser, $acpthost);
}
return 0;
}
elsif ($ok && $expired &&
($config{'passwd_mode'} == 2 || $expired == 2)) {
# Login was ok, but password has expired or was temporary. Need
# to force display of password change form.
&run_failed_script($authuser, 'expiredpass',
$loghost, $localip);
$validated = 1;
$authuser = undef;
$querystring = "&user=".&urlize($vu).
"&pam=".$use_pam.
"&expired=".$expired;
$method = "GET";
$queryargs = "";
$page = $config{'password_form'};
$logged_code = 401;
$miniserv_internal = 2;
syslog("crit", "%s",
"Expired login as $vu ".
"from $loghost") if ($use_syslog);
}
else {
# Login failed, or password has expired. The login form will be
# displayed again by later code
&run_failed_script($vu, $handle_login ? 'wronguser' :
$expired ? 'expiredpass' : 'wrongpass',
$loghost, $localip);
$failed_user = $vu;
$failed_pass = $pass;
$failed_save = $in{'save'};
$failed_twofactor_attempt = $in{'failed_twofactor_attempt'} || 0;
$failed_twofactor_attempt++;
$request_uri = $in{'page'};
$already_session_id = undef;
$method = "GET";
$authuser = $baseauthuser = undef;
# If login page is simply reloaded, with `session_login.cgi` in URL,
# without having any parameters sent (user set to empty), don't log
# false positive attempt with `Invalid login as from IP` to syslog
$nolog = 1 if (!$vu);
# Send to log if allowed
syslog("crit", "%s",
($nonexist ? "Non-existent" :
$expired ? "Expired" : "Invalid").
" login as $vu from $loghost")
if ($use_syslog && !$nolog);
}
return undef;
}
# write_login_utmp(user, host)
# Record the login by some user in utmp
sub write_login_utmp
{
if ($write_utmp) {
# Write utmp record for login
%utmp = ( 'ut_host' => $_[1],
'ut_time' => time(),
'ut_user' => $_[0],
'ut_type' => 7, # user process
'ut_pid' => $miniserv_main_pid,
'ut_line' => $config{'pam'},
'ut_id' => '' );
if (defined(&User::Utmp::putut)) {
User::Utmp::putut(\%utmp);
}
else {
User::Utmp::pututline(\%utmp);
}
}
}
# write_logout_utmp(user, host)
# Record the logout by some user in utmp
sub write_logout_utmp
{
if ($write_utmp) {
# Write utmp record for logout
%utmp = ( 'ut_host' => $_[1],
'ut_time' => time(),
'ut_user' => $_[0],
'ut_type' => 8, # dead process
'ut_pid' => $miniserv_main_pid,
'ut_line' => $config{'pam'},
'ut_id' => '' );
if (defined(&User::Utmp::putut)) {
User::Utmp::putut(\%utmp);
}
else {
User::Utmp::pututline(\%utmp);
}
}
}
# pam_conversation_process(username, write-pipe, read-pipe)
# This function is called inside a sub-process to communicate with PAM. It sends
# questions down one pipe, and reads responses from another
sub pam_conversation_process
{
local ($user, $writer, $reader) = @_;
$miniserv::pam_conversation_process_writer = $writer;
$miniserv::pam_conversation_process_reader = $reader;
eval "use Authen::PAM;";
local $convh = new Authen::PAM(
$config{'pam'}, $user, \&miniserv::pam_conversation_process_func);
local $pam_ret = $convh->pam_authenticate();
if ($pam_ret == PAM_SUCCESS()) {
local $acct_ret = $convh->pam_acct_mgmt();
if ($acct_ret == PAM_SUCCESS()) {
$convh->pam_open_session();
print $writer "x2 $user 1 0 0\n";
}
elsif ($acct_ret == PAM_NEW_AUTHTOK_REQD() ||
$acct_ret == PAM_ACCT_EXPIRED()) {
print $writer "x2 $user 1 1 0\n";
}
else {
print $writer "x0 Unknown PAM account status $acct_ret\n";
}
}
else {
print $writer "x2 $user 0 0 0\n";
}
exit(0);
}
# pam_conversation_process_func(type, message, [type, message, ...])
# A pipe that talks to both PAM and the master process
sub pam_conversation_process_func
{
local @rv;
select($miniserv::pam_conversation_process_writer); $| = 1; select(STDOUT);
while(@_) {
local ($type, $msg) = (shift, shift);
$msg =~ s/\r|\n//g;
local $ok = (print $miniserv::pam_conversation_process_writer "$type $msg\n");
print $miniserv::pam_conversation_process_writer "\n";
local $answer = <$miniserv::pam_conversation_process_reader>;
$answer =~ s/\r|\n//g;
push(@rv, PAM_SUCCESS(), $answer);
}
push(@rv, PAM_SUCCESS());
return @rv;
}
# allocate_pipes()
# Returns 4 new pipe file handles
sub allocate_pipes
{
local ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw);
local $p;
local %taken = ( (map { $_, 1 } @passin),
(map { $_->{'PASSINr'} } values %conversations) );
for($p=0; $taken{"PASSINr$p"}; $p++) { }
$PASSINr = "PASSINr$p";
$PASSINw = "PASSINw$p";
$PASSOUTr = "PASSOUTr$p";
$PASSOUTw = "PASSOUTw$p";
pipe($PASSINr, $PASSINw);
pipe($PASSOUTr, $PASSOUTw);
select($PASSINw); $| = 1;
select($PASSINr); $| = 1;
select($PASSOUTw); $| = 1;
select($PASSOUTw); $| = 1;
select(STDOUT);
return ($PASSINr, $PASSINw, $PASSOUTr, $PASSOUTw);
}
# recv_pam_question(&conv, fd)
# Reads one PAM question from the sub-process, and sends it to the HTTP handler.
# Returns 0 if the conversation is over, 1 if not.
sub recv_pam_question
{
local ($conf, $fh) = @_;
local $pr = $conf->{'PAMOUTr'};
select($pr); $| = 1; select(STDOUT);
local $line = <$pr>;
$line =~ s/\r|\n//g;
if (!$line) {
$line = <$pr>;
$line =~ s/\r|\n//g;
}
$conf->{'last'} = time();
if (!$line) {
# Failed!
print $fh "0 PAM conversation error\n";
return 0;
}
else {
local ($type, $msg) = split(/\s+/, $line, 2);
if ($type =~ /^x(\d+)/) {
# Pass this status code through
print $fh "$1 $msg\n";
return $1 == 2 || $1 == 0 ? 0 : 1;
}
elsif ($type == PAM_PROMPT_ECHO_ON()) {
# A normal question
print $fh "1 $msg\n";
return 1;
}
elsif ($type == PAM_PROMPT_ECHO_OFF()) {
# A password
print $fh "3 $msg\n";
return 1;
}
elsif ($type == PAM_ERROR_MSG() || $type == PAM_TEXT_INFO()) {
# A message that does not require a response
print $fh "4 $msg\n";
return 1;
}
else {
# Unknown type!
print $fh "0 Unknown PAM message type $type\n";
return 0;
}
}
}
# send_pam_answer(&conv, answer)
# Sends a response from the user to the PAM sub-process
sub send_pam_answer
{
local ($conf, $answer) = @_;
local $pw = $conf->{'PAMINw'};
$conf->{'last'} = time();
print $pw "$answer\n";
}
# end_pam_conversation(&conv)
# Clean up PAM conversation pipes and processes
sub end_pam_conversation
{
local ($conv) = @_;
kill('KILL', $conv->{'pid'}) if ($conv->{'pid'});
if ($conv->{'PAMINr'}) {
close($conv->{'PAMINr'});
close($conv->{'PAMOUTr'});
close($conv->{'PAMINw'});
close($conv->{'PAMOUTw'});
}
delete($conversations{$conv->{'cid'}});
}
# get_ipkeys(&miniserv)
# Returns a list of IP address to key file mappings from a miniserv.conf entry
sub get_ipkeys
{
local (@rv, $k);
foreach $k (keys %{$_[0]}) {
if ($k =~ /^ipkey_(\S+)/) {
local $ipkey = { 'ips' => [ split(/,/, $1) ],
'key' => $_[0]->{$k},
'index' => scalar(@rv) };
$ipkey->{'cert'} = $_[0]->{'ipcert_'.$1};
$ipkey->{'extracas'} = $_[0]->{'ipextracas_'.$1};
push(@rv, $ipkey);
}
}
return @rv;
}
# setup_ssl_contexts()
# Setup all the per-IP and per-domain SSL contexts and the global context based
# on the config
sub setup_ssl_contexts
{
my @ipkeys = &get_ipkeys(\%config);
if ($config{'ssl_version'}) {
# Force an SSL version
$Net::SSLeay::version = $config{'ssl_version'};
$Net::SSLeay::ssl_version = $config{'ssl_version'};
}
my $ctx = &create_ssl_context($config{'keyfile'},
$config{'certfile'},
$config{'extracas'},
$ssl_contexts{"*"});
$ctx || return "Failed to create default SSL context";
my @added = ( "*" );
$ssl_contexts{"*"} = $ctx;
foreach my $ipkey (@ipkeys) {
my $ctx = &create_ssl_context(
$ipkey->{'key'}, $ipkey->{'cert'},
$ipkey->{'extracas'} || $config{'extracas'},
$ssl_contexts{$ipkey->{'ips'}->[0]});
if ($ctx) {
foreach $ip (@{$ipkey->{'ips'}}) {
$ssl_contexts{$ip} = $ctx;
push(@added, $ip);
}
}
}
foreach my $ip (keys %ssl_contexts) {
if (&indexof($ip, @added) < 0) {
delete($ssl_contexts{$ip});
}
}
# Setup per-hostname SSL contexts on the main IP
if (defined(&Net::SSLeay::CTX_set_tlsext_servername_callback)) {
Net::SSLeay::CTX_set_tlsext_servername_callback(
$ssl_contexts{"*"}->{'ctx'},
sub {
my $ssl = shift;
my $h = Net::SSLeay::get_servername($ssl);
my $c = $ssl_contexts{$h} ||
$h =~ /^[^\.]+\.(.*)$/ && $ssl_contexts{"*.$1"};
if ($c) {
Net::SSLeay::set_SSL_CTX($ssl, $c->{'ctx'});
}
});
}
return undef;
}
# create_ssl_context(keyfile, [certfile], [extracas], [&existing-context])
# Create and return one SSL context based on a key file and optional cert file
# and CA cert
sub create_ssl_context
{
local ($keyfile, $certfile, $extracas, $already) = @_;
local @kst = stat($keyfile);
local @cst = stat($certfile);
if ($already && $already->{'keyfile'} eq $keyfile &&
$already->{'keytime'} == $kst[9] &&
$already->{'certfile'} eq $certfile &&
$already->{'certtime'} == $cst[9] &&
$already->{'extracas'} eq $extracas) {
# Context we already have is valid
return $already;
}
local $ssl_ctx;
eval { $ssl_ctx = Net::SSLeay::new_x_ctx() };
$ssl_ctx ||= Net::SSLeay::CTX_new();
if (!$ssl_ctx) {
print STDERR "Failed to create SSL context : $!\n";
return undef;
}
my @extracas = $extracas && $extracas ne "none" ? split(/\s+/, $extracas) : ();
# Validate cert files
if (!-r $keyfile) {
print STDERR "SSL key file $keyfile does not exist\n";
return undef;
}
if ($certfile && !-r $certfile) {
print STDERR "SSL cert file $certfile does not exist\n";
return undef;
}
foreach my $p (@extracas) {
if (!-r $p) {
print STDERR "SSL CA file $p does not exist\n";
return undef;
}
}
# Setup PFS, if ciphers are in use
if (-r $config{'dhparams_file'}) {
eval {
my $bio = Net::SSLeay::BIO_new_file(
$config{'dhparams_file'}, 'r');
my $DHP = Net::SSLeay::PEM_read_bio_DHparams($bio);
Net::SSLeay::CTX_set_tmp_dh($ssl_ctx, $DHP);
my $nid = Net::SSLeay::OBJ_sn2nid("secp384r1");
my $curve = Net::SSLeay::EC_KEY_new_by_curve_name($nid);
Net::SSLeay::CTX_set_tmp_ecdh($ssl_ctx, $curve);
Net::SSLeay::BIO_free($bio);
};
}
if ($@) {
print STDERR "Failed to load $config{'dhparams_file'} : $@\n";
}
if ($client_certs) {
Net::SSLeay::CTX_load_verify_locations(
$ssl_ctx, $config{'ca'}, "");
eval {
Net::SSLeay::set_verify(
$ssl_ctx, &Net::SSLeay::VERIFY_PEER, \&verify_client);
};
if ($@) {
Net::SSLeay::CTX_set_verify(
$ssl_ctx, &Net::SSLeay::VERIFY_PEER, \&verify_client);
}
}
foreach my $p (@extracas) {
Net::SSLeay::CTX_load_verify_locations($ssl_ctx, $p, "");
}
if (!Net::SSLeay::CTX_use_PrivateKey_file($ssl_ctx, $keyfile,
&Net::SSLeay::FILETYPE_PEM)) {
print STDERR "Failed to open SSL key $keyfile\n";
return undef;
}
if (!Net::SSLeay::CTX_use_certificate_file($ssl_ctx, $certfile || $keyfile,
&Net::SSLeay::FILETYPE_PEM)) {
print STDERR "Failed to open SSL cert ".($certfile || $keyfile)."\n";
return undef;
}
if ($config{'no_ssl2'}) {
eval 'Net::SSLeay::CTX_set_options($ssl_ctx,
&Net::SSLeay::OP_NO_SSLv2)';
}
if ($config{'no_ssl3'}) {
eval 'Net::SSLeay::CTX_set_options($ssl_ctx,
&Net::SSLeay::OP_NO_SSLv3)';
}
if ($config{'no_tls1'}) {
eval 'Net::SSLeay::CTX_set_options($ssl_ctx,
&Net::SSLeay::OP_NO_TLSv1)';
}
if ($config{'no_tls1_1'}) {
eval 'Net::SSLeay::CTX_set_options($ssl_ctx,
&Net::SSLeay::OP_NO_TLSv1_1)';
}
if ($config{'no_tls1_2'}) {
eval 'Net::SSLeay::CTX_set_options($ssl_ctx,
&Net::SSLeay::OP_NO_TLSv1_2)';
}
if ($config{'no_sslcompression'}) {
eval 'Net::SSLeay::CTX_set_options($ssl_ctx,
&Net::SSLeay::OP_NO_COMPRESSION)';
}
if ($config{'ssl_honorcipherorder'}) {
eval 'Net::SSLeay::CTX_set_options($ssl_ctx,
&Net::SSLeay::OP_CIPHER_SERVER_PREFERENCE)';
}
return { 'keyfile' => $keyfile,
'keytime' => $kst[9],
'certfile' => $certfile,
'certtime' => $cst[9],
'extracas' => $extracas,
'ctx' => $ssl_ctx };
}
# ssl_connection_for_ip(socket, ipv6-flag)
# Returns a new SSL connection object for some socket, or undef if failed
sub ssl_connection_for_ip
{
local ($sock, $ipv6) = @_;
local $sn = getsockname($sock);
if (!$sn) {
print STDERR "Failed to get address for socket $sock\n";
return undef;
}
local (undef, $myip, undef) = &get_address_ip($sn, $ipv6);
local $ssl_ctx = $ssl_contexts{$myip} || $ssl_contexts{"*"};
local $ssl_con = Net::SSLeay::new($ssl_ctx->{'ctx'});
if ($config{'ssl_cipher_list'}) {
# Force use of ciphers
eval "Net::SSLeay::set_cipher_list(
\$ssl_con, \$config{'ssl_cipher_list'})";
if ($@) {
print STDERR "SSL cipher $config{'ssl_cipher_list'} failed : ",
"$@\n";
}
}
Net::SSLeay::set_fd($ssl_con, fileno($sock));
if (!Net::SSLeay::accept($ssl_con)) {
return undef;
}
# Check for a per-hostname SSL context and use that instead
if (defined(&Net::SSLeay::get_servername)) {
my $h = Net::SSLeay::get_servername($ssl_con);
if ($h) {
my $c = $ssl_contexts{$h} ||
$h =~ /^[^\.]+\.(.*)$/ && $ssl_contexts{"*.$1"};
if ($c) {
$ssl_ctx = $c;
}
}
}
return ($ssl_con, $ssl_ctx->{'certfile'}, $ssl_ctx->{'keyfile'});
}
# parse_websockets_config()
# Extract websockets proxies from the config hash
sub parse_websockets_config
{
@websocket_paths = ( );
foreach my $c (keys %config) {
if ($c =~ /^websockets_(\S+)$/) {
my $ws = { 'path' => $1 };
foreach my $kv (split(/\s+/, $config{$c})) {
my ($k, $v) = split(/=/, $kv, 2);
$ws->{$k} = $v;
}
push(@websocket_paths, $ws);
}
}
}
# login_redirect(username, password, host)
# Calls the login redirect script (if configured), which may output a URL to
# re-direct a user to after logging in.
sub login_redirect
{
return undef if (!$config{'login_redirect'});
local $quser = quotemeta($_[0]);
local $qpass = quotemeta($_[1]);
local $qhost = quotemeta($_[2]);
local $url = `$config{'login_redirect'} $quser $qpass $qhost`;
chop($url);
return $url;
}
# reload_config_file()
# Re-read %config, and call post-config actions
sub reload_config_file
{
print DEBUG "in reload_config_file\n";
&log_error("Reloading configuration");
%config = &read_config_file($config_file);
&update_vital_config();
&read_users_file();
&read_mime_types();
&build_config_mappings();
&read_webmin_crons();
&precache_files();
&setup_ssl_contexts()
if ($use_ssl);
&parse_websockets_config();
if ($config{'session'}) {
dbmclose(%sessiondb);
dbmopen(%sessiondb, $config{'sessiondb'}, 0700);
}
print DEBUG "done reload_config_file\n";
}
# read_config_file(file)
# Reads the given config file, and returns a hash of values
sub read_config_file
{
local %rv;
open(CONF, $_[0]) || die "Failed to open config file $_[0] : $!";
while(<CONF>) {
s/\r|\n//g;
if (/^#/ || !/\S/) { next; }
/^([^=]+)=(.*)$/;
$name = $1; $val = $2;
$name =~ s/^\s+//g; $name =~ s/\s+$//g;
$val =~ s/^\s+//g; $val =~ s/\s+$//g;
$rv{$name} = $val;
}
close(CONF);
return %rv;
}
# read_any_file(file)
# Reads any given file and returns its content
sub read_any_file
{
my ($realfile) = @_;
my $rv;
open(my $fh, "<".$realfile) || return $rv;
local $/;
$rv = <$fh>;
close($fh);
return $rv;
}
# update_vital_config()
# Updates %config with defaults, and dies if something vital is missing
sub update_vital_config
{
my %vital = ("port", 80,
"root", "./",
"server", "MiniServ/0.01",
"index_docs", "index.html index.htm index.cgi index.php",
"addtype_html", "text/html",
"addtype_txt", "text/plain",
"addtype_gif", "image/gif",
"addtype_jpg", "image/jpeg",
"addtype_jpeg", "image/jpeg",
"realm", "MiniServ",
"session_login", "/session_login.cgi",
"pam_login", "/pam_login.cgi",
"password_form", "/password_form.cgi",
"password_change", "/password_change.cgi",
"maxconns", 50,
"maxconns_per_ip", 25,
"maxconns_per_net", 35,
"pam", "webmin",
"sidname", "sid",
"unauth", "^/unauthenticated/ ^/robots.txt\$ ^[A-Za-z0-9\\-/_]+\\.jar\$ ^[A-Za-z0-9\\-/_]+\\.class\$ ^[A-Za-z0-9\\-/_]+\\.gif\$ ^[A-Za-z0-9\\-/_]+\\.png\$ ^[A-Za-z0-9\\-/_]+\\.conf\$ ^[A-Za-z0-9\\-/_]+\\.ico\$ ^/robots.txt\$",
"max_post", 10000,
"expires", 7*24*60*60,
"pam_test_user", "root",
"precache", "lang/en */lang/en",
"cookiepath", "/",
);
foreach my $v (keys %vital) {
if (!$config{$v}) {
if ($vital{$v} eq "") {
die "Missing config option $v";
}
$config{$v} = $vital{$v};
}
}
$config_file =~ /^(.*)\/[^\/]+$/;
my $config_dir = $1;
$config{'pidfile'} =~ /^(.*)\/[^\/]+$/;
my $var_dir = $1;
if (!$config{'sessiondb'}) {
$config{'sessiondb'} = "$var_dir/sessiondb";
}
if (!$config{'errorlog'}) {
$config{'logfile'} =~ /^(.*)\/[^\/]+$/;
$config{'errorlog'} = "$1/miniserv.error";
}
if (!$config{'tempbase'}) {
$config{'tempbase'} = "$var_dir/cgitemp";
}
if (!$config{'blockedfile'}) {
$config{'blockedfile'} = "$var_dir/blocked";
}
if (!$config{'webmincron_dir'}) {
$config{'webmincron_dir'} = "$config_dir/webmincron/crons";
}
if (!$config{'webmincron_last'}) {
$config{'logfile'} =~ /^(.*)\/[^\/]+$/;
$config{'webmincron_last'} = "$1/miniserv.lastcrons";
}
if (!$config{'webmincron_wrapper'}) {
$config{'webmincron_wrapper'} = $config{'root'}.
"/webmincron/webmincron.pl";
}
if (!$config{'twofactor_wrapper'}) {
$config{'twofactor_wrapper'} = $config{'root'}."/acl/twofactor.pl";
}
$config{'restartflag'} ||= $var_dir."/restart-flag";
$config{'reloadflag'} ||= $var_dir."/reload-flag";
$config{'stopflag'} ||= $var_dir."/stop-flag";
}
# read_users_file()
# Fills the %users and %certs hashes from the users file in %config
sub read_users_file
{
undef(%users);
undef(%certs);
undef(%allow);
undef(%deny);
undef(%allowdays);
undef(%allowhours);
undef(%lastchanges);
undef(%nochange);
undef(%temppass);
undef(%twofactor);
if ($config{'userfile'}) {
open(USERS, $config{'userfile'});
while(<USERS>) {
s/\r|\n//g;
local @user = split(/:/, $_, -1);
$users{$user[0]} = $user[1];
$certs{$user[0]} = $user[3] if ($user[3]);
if ($user[4] =~ /^allow\s+(.*)/) {
my $allow = $1;
$allow =~ s/;/:/g;
$allow{$user[0]} = $config{'alwaysresolve'} ?
[ split(/\s+/, $allow) ] :
[ &to_ip46address(split(/\s+/, $allow)) ];
}
elsif ($user[4] =~ /^deny\s+(.*)/) {
my $deny = $1;
$deny =~ s/;/:/g;
$deny{$user[0]} = $config{'alwaysresolve'} ?
[ split(/\s+/, $deny) ] :
[ &to_ip46address(split(/\s+/, $deny)) ];
}
if ($user[5] =~ /days\s+(\S+)/) {
$allowdays{$user[0]} = [ split(/,/, $1) ];
}
if ($user[5] =~ /hours\s+(\d+)\.(\d+)-(\d+).(\d+)/) {
$allowhours{$user[0]} = [ $1*60+$2, $3*60+$4 ];
}
$lastchanges{$user[0]} = $user[6];
$nochange{$user[0]} = $user[9];
$temppass{$user[0]} = $user[10];
if ($user[11] && $user[12]) {
$twofactor{$user[0]} = { 'provider' => $user[11],
'id' => $user[12],
'apikey' => $user[13] };
}
}
close(USERS);
}
if ($config{'twofactorfile'}) {
open(TWO, $config{'twofactorfile'});
while(<TWO>) {
s/\r|\n//g;
local @two = split(/:/, $_, -1);
$twofactor{$two[0]} = { 'provider' => $two[1],
'id' => $two[2],
'apikey' => $two[3], };
}
close(TWO);
}
# Test user DB, if configured
if ($config{'userdb'}) {
my $dbh = &connect_userdb($config{'userdb'});
if (!ref($dbh)) {
print STDERR "Failed to open users database : $dbh\n"
}
else {
&disconnect_userdb($config{'userdb'}, $dbh);
}
}
}
# get_user_details(username, [original-username])
# Returns a hash ref of user details, either from config files or the user DB
sub get_user_details
{
my ($username, $origusername) = @_;
if (exists($users{$username})) {
# In local files
my $two = $twofactor{$origusername} || $twofactor{$username};
return { 'name' => $username,
'pass' => $users{$username},
'certs' => $certs{$username},
'allow' => $allow{$username},
'deny' => $deny{$username},
'allowdays' => $allowdays{$username},
'allowhours' => $allowhours{$username},
'lastchanges' => $lastchanges{$username},
'nochange' => $nochange{$username},
'temppass' => $temppass{$username},
'preroot' => $config{'preroot_'.$username},
'twofactor_provider' => $two->{'provider'},
'twofactor_id' => $two->{'id'},
'twofactor_apikey' => $two->{'apikey'},
};
}
if ($config{'userdb'}) {
# Try querying user database
if (exists($get_user_details_cache{$username})) {
# Cached already
return $get_user_details_cache{$username};
}
print DEBUG "get_user_details: Connecting to user database\n";
my ($dbh, $proto, $prefix, $args) = &connect_userdb($config{'userdb'});
my $user;
my %attrs;
if (!ref($dbh)) {
print DEBUG "get_user_details: Failed : $dbh\n";
print STDERR "Failed to connect to user database : $dbh\n";
}
elsif ($proto eq "mysql" || $proto eq "postgresql") {
# Fetch user ID and password with SQL
print DEBUG "get_user_details: Looking for $username in SQL\n";
my $cmd = $dbh->prepare(
"select id,pass from webmin_user where name = ?");
if (!$cmd || !$cmd->execute($username)) {
print STDERR "Failed to lookup user : ",
$dbh->errstr,"\n";
return undef;
}
my ($id, $pass) = $cmd->fetchrow();
$cmd->finish();
if (!$id) {
&disconnect_userdb($config{'userdb'}, $dbh);
$get_user_details_cache{$username} = undef;
print DEBUG "get_user_details: User not found\n";
return undef;
}
print DEBUG "get_user_details: id=$id pass=$pass\n";
# Fetch attributes and add to user object
print DEBUG "get_user_details: finding user attributes\n";
my $cmd = $dbh->prepare(
"select attr,value from webmin_user_attr where id = ?");
if (!$cmd || !$cmd->execute($id)) {
print STDERR "Failed to lookup user attrs : ",
$dbh->errstr,"\n";
return undef;
}
$user = { 'name' => $username,
'id' => $id,
'pass' => $pass,
'proto' => $proto };
while(my ($attr, $value) = $cmd->fetchrow()) {
$attrs{$attr} = $value;
}
$cmd->finish();
}
elsif ($proto eq "ldap") {
# Fetch user DN with LDAP
print DEBUG "get_user_details: Looking for $username in LDAP\n";
my $rv = $dbh->search(
base => $prefix,
filter => '(&(cn='.$username.')(objectClass='.
$args->{'userclass'}.'))',
scope => 'sub');
if (!$rv || $rv->code) {
print STDERR "Failed to lookup user : ",
($rv ? $rv->error : "Unknown error"),"\n";
return undef;
}
my ($u) = $rv->all_entries();
if (!$u || $u->get_value('cn') ne $username) {
&disconnect_userdb($config{'userdb'}, $dbh);
$get_user_details_cache{$username} = undef;
print DEBUG "get_user_details: User not found\n";
return undef;
}
# Extract attributes
my $pass = $u->get_value('webminPass');
$user = { 'name' => $username,
'id' => $u->dn(),
'pass' => $pass,
'proto' => $proto };
foreach my $la ($u->get_value('webminAttr')) {
my ($attr, $value) = split(/=/, $la, 2);
$attrs{$attr} = $value;
}
}
# Convert DB attributes into user object fields
if ($user) {
print DEBUG "get_user_details: got ",scalar(keys %attrs),
" attributes\n";
$user->{'certs'} = $attrs{'cert'};
if ($attrs{'allow'}) {
$user->{'allow'} = $config{'alwaysresolve'} ?
[ split(/\s+/, $attrs{'allow'}) ] :
[ &to_ipaddress(split(/\s+/,$attrs{'allow'})) ];
}
if ($attrs{'deny'}) {
$user->{'deny'} = $config{'alwaysresolve'} ?
[ split(/\s+/, $attrs{'deny'}) ] :
[ &to_ipaddress(split(/\s+/,$attrs{'deny'})) ];
}
if ($attrs{'days'}) {
$user->{'allowdays'} = [ split(/,/, $attrs{'days'}) ];
}
if ($attrs{'hoursfrom'} && $attrs{'hoursto'}) {
my ($hf, $mf) = split(/\./, $attrs{'hoursfrom'});
my ($ht, $mt) = split(/\./, $attrs{'hoursto'});
$user->{'allowhours'} = [ $hf*60+$ht, $ht*60+$mt ];
}
$user->{'lastchanges'} = $attrs{'lastchange'};
$user->{'nochange'} = $attrs{'nochange'};
$user->{'temppass'} = $attrs{'temppass'};
$user->{'preroot'} = $attrs{'theme'};
$user->{'twofactor_provider'} = $attrs{'twofactor_provider'};
$user->{'twofactor_id'} = $attrs{'twofactor_id'};
$user->{'twofactor_apikey'} = $attrs{'twofactor_apikey'};
}
&disconnect_userdb($config{'userdb'}, $dbh);
$get_user_details_cache{$user->{'name'}} = $user;
return $user;
}
return undef;
}
# find_user_by_cert(cert)
# Returns a username looked up by certificate
sub find_user_by_cert
{
my ($peername) = @_;
my $peername2 = $peername;
$peername2 =~ s/Email=/emailAddress=/ || $peername2 =~ s/emailAddress=/Email=/;
# First check users in local files
foreach my $username (keys %certs) {
if ($certs{$username} eq $peername ||
$certs{$username} eq $peername2) {
return $username;
}
}
# Check user DB
if ($config{'userdb'}) {
my ($dbh, $proto) = &connect_userdb($config{'userdb'});
if (!ref($dbh)) {
return undef;
}
elsif ($proto eq "mysql" || $proto eq "postgresql") {
# Query with SQL
my $cmd = $dbh->prepare("select webmin_user.name from webmin_user,webmin_user_attr where webmin_user.id = webmin_user_attr.id and webmin_user_attr.attr = 'cert' and webmin_user_attr.value = ?");
return undef if (!$cmd);
foreach my $p ($peername, $peername2) {
my $username;
if ($cmd->execute($p)) {
($username) = $cmd->fetchrow();
}
$cmd->finish();
return $username if ($username);
}
}
elsif ($proto eq "ldap") {
# Lookup in LDAP
my $rv = $dbh->search(
base => $prefix,
filter => '(objectClass='.
$args->{'userclass'}.')',
scope => 'sub',
attrs => [ 'cn', 'webminAttr' ]);
if ($rv && !$rv->code) {
foreach my $u ($rv->all_entries) {
my @attrs = $u->get_value('webminAttr');
foreach my $la (@attrs) {
my ($attr, $value) = split(/=/, $la, 2);
if ($attr eq "cert" &&
($value eq $peername ||
$value eq $peername2)) {
return $u->get_value('cn');
}
}
}
}
}
}
return undef;
}
# connect_userdb(string)
# Returns a handle for talking to a user database - may be a DBI or LDAP handle.
# On failure returns an error message string. In an array context, returns the
# protocol type too.
sub connect_userdb
{
my ($str) = @_;
my ($proto, $user, $pass, $host, $prefix, $args) = &split_userdb_string($str);
if ($proto eq "mysql") {
# Connect to MySQL with DBI
my $drh = eval "use DBI; DBI->install_driver('mysql');";
$drh || return $text{'sql_emysqldriver'};
my ($host, $port) = split(/:/, $host);
my $cstr = "database=$prefix;host=$host";
$cstr .= ";port=$port" if ($port);
print DEBUG "connect_userdb: Connecting to MySQL $cstr as $user\n";
my $dbh = $drh->connect($cstr, $user, $pass, { });
$dbh || return "Failed to connect to MySQL : ".$drh->errstr;
print DEBUG "connect_userdb: Connected OK\n";
return wantarray ? ($dbh, $proto, $prefix, $args) : $dbh;
}
elsif ($proto eq "postgresql") {
# Connect to PostgreSQL with DBI
my $drh = eval "use DBI; DBI->install_driver('Pg');";
$drh || return $text{'sql_epostgresqldriver'};
my ($host, $port) = split(/:/, $host);
my $cstr = "dbname=$prefix;host=$host";
$cstr .= ";port=$port" if ($port);
print DEBUG "connect_userdb: Connecting to PostgreSQL $cstr as $user\n";
my $dbh = $drh->connect($cstr, $user, $pass);
$dbh || return "Failed to connect to PostgreSQL : ".$drh->errstr;
print DEBUG "connect_userdb: Connected OK\n";
return wantarray ? ($dbh, $proto, $prefix, $args) : $dbh;
}
elsif ($proto eq "ldap") {
# Connect with perl LDAP module
eval "use Net::LDAP";
$@ && return $text{'sql_eldapdriver'};
my ($host, $port) = split(/:/, $host);
my $scheme = $args->{'scheme'} || 'ldap';
if (!$port) {
$port = $scheme eq 'ldaps' ? 636 : 389;
}
my $ldap = Net::LDAP->new($host,
port => $port,
'scheme' => $scheme);
$ldap || return "Failed to connect to LDAP : ".$host;
my $mesg;
if ($args->{'tls'}) {
# Switch to TLS mode
eval { $mesg = $ldap->start_tls(); };
if ($@ || !$mesg || $mesg->code) {
return "Failed to switch to LDAP TLS mode : ".
($@ ? $@ : $mesg ? $mesg->error : "Unknown error");
}
}
# Login to the server
if ($pass) {
$mesg = $ldap->bind(dn => $user, password => $pass);
}
else {
$mesg = $ldap->bind(dn => $user, anonymous => 1);
}
if (!$mesg || $mesg->code) {
return "Failed to login to LDAP as ".$user." : ".
($mesg ? $mesg->error : "Unknown error");
}
return wantarray ? ($ldap, $proto, $prefix, $args) : $ldap;
}
else {
return "Unknown protocol $proto";
}
}
# split_userdb_string(string)
# Converts a string like mysql://user:pass@host/db into separate parts
sub split_userdb_string
{
my ($str) = @_;
if ($str =~ /^([a-z]+):\/\/([^:]*):([^\@]*)\@([a-z0-9\.\-\_]+)\/([^\?]+)(\?(.*))?$/) {
my ($proto, $user, $pass, $host, $prefix, $argstr) =
($1, $2, $3, $4, $5, $7);
my %args = map { split(/=/, $_, 2) } split(/\&/, $argstr);
return ($proto, $user, $pass, $host, $prefix, \%args);
}
return ( );
}
# disconnect_userdb(string, &handle)
# Closes a handle opened by connect_userdb
sub disconnect_userdb
{
my ($str, $h) = @_;
if ($str =~ /^(mysql|postgresql):/) {
# DBI disconnect
$h->disconnect();
}
elsif ($str =~ /^ldap:/) {
# LDAP disconnect
$h->disconnect();
}
}
# read_mime_types()
# Fills %mime with entries from file in %config and extra settings in %config
sub read_mime_types
{
undef(%mime);
if ($config{"mimetypes"} ne "") {
open(MIME, $config{"mimetypes"});
while(<MIME>) {
chop; s/#.*$//;
if (/^(\S+)\s+(.*)$/) {
my $type = $1;
my @exts = split(/\s+/, $2);
foreach my $ext (@exts) {
$mime{$ext} = $type;
}
}
}
close(MIME);
}
foreach my $k (keys %config) {
if ($k !~ /^addtype_(.*)$/) { next; }
$mime{$1} = $config{$k};
}
}
# build_config_mappings()
# Build the anonymous access list, IP access list, unauthenticated URLs list,
# redirect mapping and allow and deny lists from %config
sub build_config_mappings
{
# build anonymous access list
undef(%anonymous);
foreach my $a (split(/\s+/, $config{'anonymous'})) {
if ($a =~ /^([^=]+)=(\S+)$/) {
$anonymous{$1} = $2;
}
}
# build IP access list
undef(%ipaccess);
foreach my $a (split(/\s+/, $config{'ipaccess'})) {
if ($a =~ /^([^=]+)=(\S+)$/) {
$ipaccess{$1} = $2;
}
}
# build unauthenticated URLs list
@unauth = split(/\s+/, $config{'unauth'});
# build redirect mapping
undef(%redirect);
foreach my $r (split(/\s+/, $config{'redirect'})) {
if ($r =~ /^([^=]+)=(\S+)$/) {
$redirect{$1} = $2;
}
}
# build prefixes to be stripped
undef(@strip_prefix);
foreach my $r (split(/\s+/, $config{'strip_prefix'})) {
push(@strip_prefix, $r);
}
# Init allow and deny lists
@deny = split(/\s+/, $config{"deny"});
@deny = &to_ipaddress(@deny) if (!$config{'alwaysresolve'});
@allow = split(/\s+/, $config{"allow"});
@allow = &to_ipaddress(@allow) if (!$config{'alwaysresolve'});
undef(@allowusers);
undef(@denyusers);
if ($config{'allowusers'}) {
@allowusers = split(/\s+/, $config{'allowusers'});
}
elsif ($config{'denyusers'}) {
@denyusers = split(/\s+/, $config{'denyusers'});
}
# Build list of unixauth mappings
undef(%unixauth);
foreach my $ua (split(/\s+/, $config{'unixauth'})) {
if ($ua =~ /^(\S+)=(\S+)$/) {
$unixauth{$1} = $2;
}
else {
$unixauth{"*"} = $ua;
}
}
# Build list of non-session-auth pages
undef(%sessiononly);
foreach my $sp (split(/\s+/, $config{'sessiononly'})) {
$sessiononly{$sp} = 1;
}
# Build list of logout times
undef(@logouttimes);
foreach my $a (split(/\s+/, $config{'logouttimes'})) {
if ($a =~ /^([^=]+)=(\S+)$/) {
push(@logouttimes, [ $1, $2 ]);
}
}
push(@logouttimes, [ undef, $config{'logouttime'} ]);
# Build list of DAV pathss
undef(@davpaths);
foreach my $d (split(/\s+/, $config{'davpaths'})) {
push(@davpaths, $d);
}
@davusers = split(/\s+/, $config{'dav_users'});
# Mobile agent substrings and hostname prefixes
@mobile_agents = split(/\t+/, $config{'mobile_agents'});
@mobile_prefixes = split(/\s+/, $config{'mobile_prefixes'});
# Expires time list
@expires_paths = ( );
foreach my $pe (split(/\t+/, $config{'expires_paths'})) {
my ($p, $e) = split(/=/, $pe);
if ($p && $e ne '') {
push(@expires_paths, [ $p, $e ]);
}
}
# Re-open debug log
close(DEBUG);
if ($config{'debuglog'}) {
open(DEBUG, ">>$config{'debuglog'}");
select(DEBUG); $| = 1; select(STDOUT);
}
else {
open(DEBUG, ">/dev/null");
}
# Reset cache of sudo checks
undef(%sudocache);
}
# is_group_member(&uinfo, groupname)
# Returns 1 if some user is a primary or secondary member of a group
sub is_group_member
{
local ($uinfo, $group) = @_;
local @ginfo = getgrnam($group);
return 0 if (!@ginfo);
return 1 if ($ginfo[2] == $uinfo->[3]); # primary member
foreach my $m (split(/\s+/, $ginfo[3])) {
return 1 if ($m eq $uinfo->[0]);
}
return 0;
}
# prefix_to_mask(prefix)
# Converts a number like 24 to a mask like 255.255.255.0
sub prefix_to_mask
{
return $_[0] >= 24 ? "255.255.255.".(256-(2 ** (32-$_[0]))) :
$_[0] >= 16 ? "255.255.".(256-(2 ** (24-$_[0]))).".0" :
$_[0] >= 8 ? "255.".(256-(2 ** (16-$_[0]))).".0.0" :
(256-(2 ** (8-$_[0]))).".0.0.0";
}
# get_logout_time(user, session-id)
# Given a username, returns the idle time before he will be logged out
sub get_logout_time
{
local ($user, $sid) = @_;
if (!defined($logout_time_cache{$user,$sid})) {
local $time;
foreach my $l (@logouttimes) {
if ($l->[0] =~ /^\@(.*)$/) {
# Check group membership
local @uinfo = getpwnam($user);
if (@uinfo && &is_group_member(\@uinfo, $1)) {
$time = $l->[1];
}
}
elsif ($l->[0] =~ /^\//) {
# Check file contents
open(FILE, $l->[0]);
while(<FILE>) {
s/\r|\n//g;
s/^\s*#.*$//;
if ($user eq $_) {
$time = $l->[1];
last;
}
}
close(FILE);
}
elsif (!$l->[0]) {
# Always match
$time = $l->[1];
}
else {
# Check username
if ($l->[0] eq $user) {
$time = $l->[1];
}
}
last if (defined($time));
}
$logout_time_cache{$user,$sid} = $time;
}
return $logout_time_cache{$user,$sid};
}
# password_crypt(password, salt)
# If the salt looks like MD5 and we have a library for it, perform MD5 hashing
# of a password. Otherwise, do Unix crypt.
sub password_crypt
{
local ($pass, $salt) = @_;
local $rval;
if ($salt =~ /^\$1\$/ && $use_md5) {
$rval = &encrypt_md5($pass, $salt);
}
elsif ($salt =~ /^\$6\$/ && $use_sha512) {
$rval = &encrypt_sha512($pass, $salt);
}
if (!defined($rval) || $salt ne $rval) {
$rval = &unix_crypt($pass, $salt);
}
return $rval;
}
# unix_crypt(password, salt)
# Performs standard Unix hashing for a password
sub unix_crypt
{
local ($pass, $salt) = @_;
if ($use_perl_crypt) {
return Crypt::UnixCrypt::crypt($pass, $salt);
}
else {
return crypt($pass, $salt);
}
}
# handle_dav_request(davpath)
# Pass a request on to the Net::DAV::Server module
sub handle_dav_request
{
local ($path) = @_;
eval "use Filesys::Virtual::Plain";
eval "use Net::DAV::Server";
eval "use HTTP::Request";
eval "use HTTP::Headers";
if ($Net::DAV::Server::VERSION eq '1.28' && $config{'dav_nolock'}) {
delete $Net::DAV::Server::implemented{lock};
delete $Net::DAV::Server::implemented{unlock};
}
# Read in request data
if (!$posted_data) {
local $clen = $header{"content-length"};
while(length($posted_data) < $clen) {
$buf = &read_data($clen - length($posted_data));
if (!length($buf)) {
&http_error(500, "Failed to read POST request");
}
$posted_data .= $buf;
}
}
# For subsequent logging
open(MINISERVLOG, ">>$config{'logfile'}");
# Switch to user
local $root;
local @u = getpwnam($authuser);
if ($config{'dav_remoteuser'} && !$< && $validated) {
if (@u) {
if ($u[2] != 0) {
$( = $u[3]; $) = "$u[3] $u[3]";
($>, $<) = ($u[2], $u[2]);
}
if ($config{'dav_root'} eq '*') {
$root = $u[7];
}
}
else {
&http_error(500, "Unix user ".&html_strip($authuser).
" does not exist");
return 0;
}
}
$root ||= $config{'dav_root'};
$root ||= "/";
# Check if this user can use DAV
if (@davusers) {
&users_match(\@u, @davusers) ||
&http_error(500, "You are not allowed to access DAV");
}
# Create DAV server
my $filesys = Filesys::Virtual::Plain->new({root_path => $root});
my $webdav = Net::DAV::Server->new();
$webdav->filesys($filesys);
# Make up a request object, and feed to DAV
local $ho = HTTP::Headers->new;
foreach my $h (keys %header) {
next if (lc($h) eq "connection");
$ho->header($h => $header{$h});
}
if ($path ne "/") {
$request_uri =~ s/^\Q$path\E//;
$request_uri = "/" if ($request_uri eq "");
}
my $request = HTTP::Request->new($method, $request_uri, $ho,
$posted_data);
if ($config{'dav_debug'}) {
print STDERR "DAV request :\n";
print STDERR "---------------------------------------------\n";
print STDERR $request->as_string();
print STDERR "---------------------------------------------\n";
}
my $response = $webdav->run($request);
# Send back the reply
&write_data("HTTP/1.1 ",$response->code()," ",$response->message(),"\r\n");
local $content = $response->content();
if ($path ne "/") {
$content =~ s|href>/(.+)<|href>$path/$1<|g;
$content =~ s|href>/<|href>$path<|g;
}
foreach my $h ($response->header_field_names) {
next if (lc($h) eq "connection" || lc($h) eq "content-length");
&write_data("$h: ",$response->header($h),"\r\n");
}
&write_data("Content-length: ",length($content),"\r\n");
local $rv = &write_keep_alive(0);
&write_data("\r\n");
&write_data($content);
if ($config{'dav_debug'}) {
print STDERR "DAV reply :\n";
print STDERR "---------------------------------------------\n";
print STDERR "HTTP/1.1 ",$response->code()," ",$response->message(),"\r\n";
foreach my $h ($response->header_field_names) {
next if (lc($h) eq "connection" || lc($h) eq "content-length");
print STDERR "$h: ",$response->header($h),"\r\n";
}
print STDERR "Content-length: ",length($content),"\r\n";
print STDERR "\r\n";
print STDERR $content;
print STDERR "---------------------------------------------\n";
}
# Log it
&log_request($loghost, $authuser, $reqline, $response->code(),
length($response->content()));
return 0;
}
# handle_websocket_request(&wsconfig, original-path)
# Handle a websockets connection, which may be a proxy to another host and port
sub handle_websocket_request
{
my ($ws, $simple) = @_;
my $key = $header{'sec-websocket-key'};
if (!$key) {
&http_error(500, "Missing Sec-Websocket-Key header");
return 0;
}
my @users = split(/\s+/, $ws->{'user'});
my @busers = split(/\s+/, $ws->{'buser'});
if (@users || @busers) {
if (&indexof($authuser, @users) < 0 &&
&indexof($baseauthuser, @busers) < 0) {
&http_error(500, "Invalid user for Websockets connection");
return 0;
}
}
my @protos = split(/\s*,\s*/, $header{'sec-websocket-protocol'});
print DEBUG "websockets protos ",join(" ", @protos),"\n";
# Connect to the configured backend
my $fh = "WEBSOCKET";
if ($ws->{'host'}) {
# Backend is a TCP port
my $err = &open_socket($ws->{'host'}, $ws->{'port'}, $fh);
&http_error(500, "Websockets connection failed : $err") if ($err);
print DEBUG "websockets host $ws->{'host'}:$ws->{'port'}\n";
}
elsif ($ws->{'pipe'}) {
# Backend is a Unix pipe
open($fh, $ws->{'pipe'}) ||
&http_error(500, "Websockets pipe failed : $?");
print DEBUG "websockets pipe $ws->{'pipe'}\n";
}
else {
&http_error(500, "Invalid Webmin websockets config");
}
# Send successful connection headers
eval "use Digest::SHA";
if ($@) {
&http_error(500, "Missing Digest::SHA perl module");
}
my $rkey = $key."258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
my $sha1 = Digest::SHA->new;
$sha1->add($rkey);
my $digest = $sha1->digest;
$digest = &b64encode($digest);
&write_data("HTTP/1.1 101 Switching Protocols\r\n");
&write_data("Upgrade: websocket\r\n");
&write_data("Connection: Upgrade\r\n");
&write_data("Sec-Websocket-Accept: $digest\r\n");
if (@protos) {
&write_data("Sec-Websocket-Protocol: $protos[0]\r\n");
}
&write_data("\r\n");
# Send a websockets request to the backend
my $path = $ws->{'wspath'} || $simple;
my $bsession_id = &b64encode($session_id);
print DEBUG "send request to $path to websockets backend\n";
print $fh "GET $path HTTP/1.1\r\n";
if ($ws->{'host'}) {
print $fh "Host: $ws->{'host'}\r\n";
}
print $fh "Upgrade: websocket\r\n";
print $fh "Connection: Upgrade\r\n";
if ($ws->{'nokey'}) {
print $fh "Sec-WebSocket-Key: $key\r\n";
}
else {
print DEBUG "Sending key $bsession_id\n";
print $fh "Sec-WebSocket-Key: $bsession_id\r\n";
}
if (@protos) {
print $fh "Sec-WebSocket-Protocol: ",join(" ", @protos),"\r\n";
}
print $fh "Sec-WebSocket-Version: $header{'sec-websocket-version'}\r\n";
print $fh "\r\n";
# Read back the reply
my $rh = <$fh>;
$rh =~ s/\r|\n//g;
print DEBUG "got $rh from websockets backend\n";
$rh =~ /^HTTP\/1\.1\s+(\d+)/ ||
&http_error(500, "Bad response from websockets backend : ".
&html_strip($rh));
my $code = $1;
my %rheader;
my $lastheader;
while(1) {
$rh = <$fh>;
$rh =~ s/\r|\n//g;
last if ($rh eq "");
if ($rh =~ /^(\S+):\s*(.*)$/) {
print DEBUG "got websockets header $1 = $2\n";
$rheader{$lastheader = lc($1)} = $2;
}
elsif ($rh =~ /^\s+(.*)$/) {
$rheader{$lastheader} .= $headline;
}
else {
&http_error(500, "Bad header from websockets backend ".
&html_strip($rh));
}
}
if ($code != 101) {
&http_error(500, "Bad response code $code from websockets backend : ".
&html_strip($rh));
}
lc($rheader{'upgrade'}) eq 'websocket' ||
&http_error(500, "Missing Upgrade header from websockets backend");
lc($rheader{'connection'}) =~ /upgrade/ ||
&http_error(500, "Missing Connection header from websockets backend");
# Check the reply key
my $bdigest;
if ($ws->{'nokey'}) {
$bdigest = $digest;
}
else {
my $brkey = $bsession_id."258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
my $bsha1 = Digest::SHA->new;
$bsha1->add($brkey);
$bdigest = $bsha1->digest;
$bdigest = &b64encode($bdigest);
}
print DEBUG "expecting digest $bdigest\n";
lc($rheader{'sec-websocket-accept'}) eq lc($bdigest) ||
&http_error(500, "Incorrect digest header from websockets backend");
# Log now
&log_request($loghost, $authuser, $reqline, "101", 0);
# Start forwarding data
seek(DEBUG, 0, 2);
print DEBUG "in websockets loop\n";
my $last_session_check_time = time();
while(1) {
my $rmask = undef;
vec($rmask, fileno($fh), 1) = 1;
vec($rmask, fileno(SOCK), 1) = 1;
my $sel = select($rmask, undef, undef, 10);
my ($buf, $ok);
if (vec($rmask, fileno($fh), 1)) {
# Got something from the websockets backend
$ok = sysread($fh, $buf, 1024);
last if ($ok <= 0); # Backend has closed
&write_data($buf);
}
if (vec($rmask, fileno(SOCK), 1)) {
# Got something from the browser
$buf = &read_data(1024);
last if (!defined($buf) || length($buf) == 0);
syswrite($fh, $buf, length($buf)) || last;
}
my $now = time();
if ($now - $last_session_check_time > 10) {
# Re-validate the browser session every 10 seconds
print DEBUG "verifying websockets session $session_id\n";
print $PASSINw "verify $session_id 0 $acptip\n";
<$PASSOUTr> =~ /(\d+)\s+(\S+)/;
if ($1 != 2) {
print DEBUG "session $session_id has expired!\n";
last;
}
$last_session_check_time = $now;
}
}
close($fh);
close(SOCK);
print DEBUG "done websockets loop\n";
return 0;
}
# get_system_hostname()
# Returns the hostname of this system, for reporting to listeners
sub get_system_hostname
{
# On Windows, try computername environment variable
return $ENV{'computername'} if ($ENV{'computername'});
return $ENV{'COMPUTERNAME'} if ($ENV{'COMPUTERNAME'});
# If a specific command is set, use it first
if ($config{'hostname_command'}) {
local $out = `($config{'hostname_command'}) 2>&1`;
if (!$?) {
$out =~ s/\r|\n//g;
return $out;
}
}
# First try the hostname command
local $out = `hostname 2>&1`;
if (!$? && $out =~ /\S/) {
$out =~ s/\r|\n//g;
return $out;
}
# Try the Sys::Hostname module
eval "use Sys::Hostname";
if (!$@) {
local $rv = eval "hostname()";
if (!$@ && $rv) {
return $rv;
}
}
# Must use net name on Windows
local $out = `net name 2>&1`;
if ($out =~ /\-+\r?\n(\S+)/) {
return $1;
}
return undef;
}
# indexof(string, array)
# Returns the index of some value in an array, or -1
sub indexof {
local($i);
for($i=1; $i <= $#_; $i++) {
if ($_[$i] eq $_[0]) { return $i - 1; }
}
return -1;
}
# has_command(command)
# Returns the full path if some command is in the path, undef if not
sub has_command
{
local($d);
if (!$_[0]) { return undef; }
if (exists($has_command_cache{$_[0]})) {
return $has_command_cache{$_[0]};
}
local $rv = undef;
if ($_[0] =~ /^\//) {
$rv = -x $_[0] ? $_[0] : undef;
}
else {
local $sp = $on_windows ? ';' : ':';
foreach $d (split($sp, $ENV{PATH})) {
if (-x "$d/$_[0]") {
$rv = "$d/$_[0]";
last;
}
if ($on_windows) {
foreach my $sfx (".exe", ".com", ".bat") {
if (-r "$d/$_[0]".$sfx) {
$rv = "$d/$_[0]".$sfx;
last;
}
}
}
}
}
$has_command_cache{$_[0]} = $rv;
return $rv;
}
# check_sudo_permissions(user, pass)
# Returns 1 if some user can run any command via sudo
sub check_sudo_permissions
{
local ($user, $pass) = @_;
# First try the pipes
if ($PASSINw) {
print DEBUG "check_sudo_permissions: querying cache for $user\n";
print $PASSINw "readsudo $user\n";
local $can = <$PASSOUTr>;
chop($can);
print DEBUG "check_sudo_permissions: cache said $can\n";
if ($can =~ /^\d+$/ && $can != 2) {
return int($can);
}
}
local $ptyfh = new IO::Pty;
print DEBUG "check_sudo_permissions: ptyfh=$ptyfh\n";
if (!$ptyfh) {
print STDERR "Failed to create new PTY with IO::Pty\n";
return 0;
}
local @uinfo = getpwnam($user);
if (!@uinfo) {
print STDERR "Unix user $user does not exist for sudo\n";
return 0;
}
# Execute sudo in a sub-process, via a pty
local $ttyfh = $ptyfh->slave();
print DEBUG "check_sudo_permissions: ttyfh=$ttyfh\n";
local $tty = $ptyfh->ttyname();
print DEBUG "check_sudo_permissions: tty=$tty\n";
chown($uinfo[2], $uinfo[3], $tty);
pipe(SUDOr, SUDOw);
print DEBUG "check_sudo_permissions: about to fork..\n";
local $pid = fork();
print DEBUG "check_sudo_permissions: fork=$pid pid=$$\n";
if ($pid < 0) {
print STDERR "fork for sudo failed : $!\n";
return 0;
}
if (!$pid) {
setsid();
($(, $)) = ( $uinfo[3],
"$uinfo[3] ".join(" ", $uinfo[3],
&other_groups($uinfo[0])) );
($>, $<) = ($uinfo[2], $uinfo[2]);
$ENV{'USER'} = $ENV{'LOGNAME'} = $user;
$ENV{'HOME'} = $uinfo[7];
$ptyfh->make_slave_controlling_terminal();
close(STDIN); close(STDOUT); close(STDERR);
untie(*STDIN); untie(*STDOUT); untie(*STDERR);
close($PASSINw); close($PASSOUTr);
close(SUDOw);
close(SOCK);
close(MAIN);
open(STDIN, "<&SUDOr");
open(STDOUT, ">$tty");
open(STDERR, ">&STDOUT");
close($ptyfh);
exec("sudo -l -S");
print "Exec failed : $!\n";
exit 1;
}
print DEBUG "check_sudo_permissions: pid=$pid\n";
close(SUDOr);
$ptyfh->close_slave();
# Send password, and get back response
local $oldfh = select(SUDOw);
$| = 1;
select($oldfh);
print DEBUG "check_sudo_permissions: about to send pass\n";
local $SIG{'PIPE'} = 'ignore'; # Sometimes sudo doesn't ask for a password
print SUDOw $pass,"\n";
print DEBUG "check_sudo_permissions: sent pass=$pass\n";
close(SUDOw);
local $out;
while(<$ptyfh>) {
print DEBUG "check_sudo_permissions: got $_";
$out .= $_;
}
close($ptyfh);
kill('KILL', $pid);
waitpid($pid, 0);
local ($ok) = ($out =~ /\(ALL\)\s+ALL|\(ALL\)\s+NOPASSWD:\s+ALL|\(ALL\s*:\s*ALL\)\s+ALL|\(ALL\s*:\s*ALL\)\s+NOPASSWD:\s+ALL/ ? 1 : 0);
# Update cache
if ($PASSINw) {
print $PASSINw "writesudo $user $ok\n";
}
return $ok;
}
sub other_groups
{
my ($user) = @_;
my @rv;
setgrent();
while(my @g = getgrent()) {
my @m = split(/\s+/, $g[3]);
push(@rv, $g[2]) if (&indexof($user, @m) >= 0);
}
endgrent();
return @rv;
}
# is_mobile_useragent(agent)
# Returns 1 if some user agent looks like a cellphone or other mobile device,
# such as a treo.
sub is_mobile_useragent
{
local ($agent) = @_;
local @prefixes = (
"UP.Link", # Openwave
"Nokia", # All Nokias start with Nokia
"MOT-", # All Motorola phones start with MOT-
"SAMSUNG", # Samsung browsers
"Samsung", # Samsung browsers
"SEC-", # Samsung browsers
"AU-MIC", # Samsung browsers
"AUDIOVOX", # Audiovox
"BlackBerry", # BlackBerry
"hiptop", # Danger hiptop Sidekick
"SonyEricsson", # Sony Ericsson
"Ericsson", # Old Ericsson browsers , mostly WAP
"Mitsu/1.1.A", # Mitsubishi phones
"Panasonic WAP", # Panasonic old WAP phones
"DoCoMo", # DoCoMo phones
"Lynx", # Lynx text-mode linux browser
"Links", # Another text-mode linux browser
"Dalvik", # Android browser
);
local @substrings = (
"UP.Browser", # Openwave
"MobilePhone", # NetFront
"AU-MIC-A700", # Samsung A700 Obigo browsers
"Danger hiptop", # Danger Sidekick hiptop
"Windows CE", # Windows CE Pocket PC
"IEMobile", # Windows mobile browser
"Blazer", # Palm Treo Blazer
"BlackBerry", # BlackBerries can emulate other browsers, but
# they still keep this string in the UserAgent
"SymbianOS", # New Series60 browser has safari in it and
# SymbianOS is the only distinguishing string
"iPhone", # Apple iPhone KHTML browser
"iPod", # iPod touch browser
"MobileSafari", # HTTP client in iPhone
"Mobile Safari", # Samsung Galaxy S6 browser
"Opera Mini", # Opera Mini
"HTC_P3700", # HTC mobile device
"Pre/", # Palm Pre
"webOS/", # Palm WebOS
"Nintendo DS", # DSi / DSi-XL
);
local @regexps = (
"Android.*Mobile", # Android phone
);
foreach my $p (@prefixes) {
return 1 if ($agent =~ /^\Q$p\E/);
}
foreach my $s (@substrings, @mobile_agents) {
return 1 if ($agent =~ /\Q$s\E/);
}
foreach my $s (@regexps) {
return 1 if ($agent =~ /$s/);
}
return 0;
}
# write_blocked_file()
# Writes out a text file of blocked hosts and users
sub write_blocked_file
{
open(BLOCKED, ">$config{'blockedfile'}");
foreach my $d (grep { $hostfail{$_} } @deny) {
print BLOCKED "host $d $hostfail{$d} $blockhosttime{$d}\n";
}
foreach my $d (grep { $userfail{$_} } @denyusers) {
print BLOCKED "user $d $userfail{$d} $blockusertime{$d}\n";
}
close(BLOCKED);
chmod(0700, $config{'blockedfile'});
}
sub write_pid_file
{
open(PIDFILE, ">$config{'pidfile'}");
printf PIDFILE "%d\n", getpid();
close(PIDFILE);
$miniserv_main_pid = getpid();
}
# lock_user_password(user)
# Updates a user's password file entry to lock it, both in memory and on disk.
# Returns 1 if done, -1 if no such user, 0 if already locked
sub lock_user_password
{
local ($user) = @_;
local $uinfo = &get_user_details($user);
if (!$uinfo) {
# No such user!
return -1;
}
if ($uinfo->{'pass'} =~ /^\!/) {
# Already locked
return 0;
}
if (!$uinfo->{'proto'}) {
# Write to users file
$users{$user} = "!".$users{$user};
open(USERS, $config{'userfile'});
local @ufile = <USERS>;
close(USERS);
foreach my $u (@ufile) {
local @uinfo = split(/:/, $u);
if ($uinfo[0] eq $user) {
$uinfo[1] = $users{$user};
}
$u = join(":", @uinfo);
}
open(USERS, ">$config{'userfile'}");
print USERS @ufile;
close(USERS);
return 0;
}
if ($config{'userdb'}) {
# Update user DB
my ($dbh, $proto, $prefix, $args) = &connect_userdb($config{'userdb'});
if (!$dbh) {
return -1;
}
elsif ($proto eq "mysql" || $proto eq "postgresql") {
# Update user attribute
my $cmd = $dbh->prepare(
"update webmin_user set pass = ? where id = ?");
if (!$cmd || !$cmd->execute("!".$uinfo->{'pass'},
$uinfo->{'id'})) {
# Update failed
print STDERR "Failed to lock password : ",
$dbh->errstr,"\n";
return -1;
}
$cmd->finish() if ($cmd);
}
elsif ($proto eq "ldap") {
# Update LDAP object
my $rv = $dbh->modify($uinfo->{'id'},
replace => { 'webminPass' => '!'.$uinfo->{'pass'} });
if (!$rv || $rv->code) {
print STDERR "Failed to lock password : ",
($rv ? $rv->error : "Unknown error"),"\n";
return -1;
}
}
&disconnect_userdb($config{'userdb'}, $dbh);
return 0;
}
return -1; # This should never be reached
}
# hash_session_id(sid)
# Returns an MD5 or Unix-crypted session ID
sub hash_session_id
{
local ($sid) = @_;
if (!$hash_session_id_cache{$sid}) {
if ($use_md5) {
# Take MD5 hash
$hash_session_id_cache{$sid} = &encrypt_md5($sid);
}
else {
# Unix crypt
$hash_session_id_cache{$sid} = &unix_crypt($sid, "XX");
}
}
return $hash_session_id_cache{$sid};
}
# encrypt_md5(string, [salt])
# Returns a string encrypted in MD5 format
sub encrypt_md5
{
local ($passwd, $salt) = @_;
local $magic = '$1$';
if ($salt =~ /^\$1\$([^\$]+)/) {
# Extract actual salt from already encrypted password
$salt = $1;
}
# Add the password
local $ctx = eval "new $use_md5";
$ctx->add($passwd);
if ($salt) {
$ctx->add($magic);
$ctx->add($salt);
}
# Add some more stuff from the hash of the password and salt
local $ctx1 = eval "new $use_md5";
$ctx1->add($passwd);
if ($salt) {
$ctx1->add($salt);
}
$ctx1->add($passwd);
local $final = $ctx1->digest();
for($pl=length($passwd); $pl>0; $pl-=16) {
$ctx->add($pl > 16 ? $final : substr($final, 0, $pl));
}
# This piece of code seems rather pointless, but it's in the C code that
# does MD5 in PAM so it has to go in!
local $j = 0;
local ($i, $l);
for($i=length($passwd); $i; $i >>= 1) {
if ($i & 1) {
$ctx->add("\0");
}
else {
$ctx->add(substr($passwd, $j, 1));
}
}
$final = $ctx->digest();
if ($salt) {
# This loop exists only to waste time
for($i=0; $i<1000; $i++) {
$ctx1 = eval "new $use_md5";
$ctx1->add($i & 1 ? $passwd : $final);
$ctx1->add($salt) if ($i % 3);
$ctx1->add($passwd) if ($i % 7);
$ctx1->add($i & 1 ? $final : $passwd);
$final = $ctx1->digest();
}
}
# Convert the 16-byte final string into a readable form
local $rv;
local @final = map { ord($_) } split(//, $final);
$l = ($final[ 0]<<16) + ($final[ 6]<<8) + $final[12];
$rv .= &to64($l, 4);
$l = ($final[ 1]<<16) + ($final[ 7]<<8) + $final[13];
$rv .= &to64($l, 4);
$l = ($final[ 2]<<16) + ($final[ 8]<<8) + $final[14];
$rv .= &to64($l, 4);
$l = ($final[ 3]<<16) + ($final[ 9]<<8) + $final[15];
$rv .= &to64($l, 4);
$l = ($final[ 4]<<16) + ($final[10]<<8) + $final[ 5];
$rv .= &to64($l, 4);
$l = $final[11];
$rv .= &to64($l, 2);
# Add salt if needed
if ($salt) {
return $magic.$salt.'$'.$rv;
}
else {
return $rv;
}
}
# encrypt_sha512(password, [salt])
# Hashes a password, possibly with the given salt, with SHA512
sub encrypt_sha512
{
my ($passwd, $salt) = @_;
if ($salt =~ /^\$6\$([^\$]+)/) {
# Extract actual salt from already encrypted password
$salt = $1;
}
$salt ||= '$6$'.substr(time(), -8).'$';
return crypt($passwd, $salt);
}
sub to64
{
local ($v, $n) = @_;
local $r;
while(--$n >= 0) {
$r .= $itoa64[$v & 0x3f];
$v >>= 6;
}
return $r;
}
# read_file(file, &assoc, [&order], [lowercase])
# Fill an associative array with name=value pairs from a file
sub read_file
{
open(ARFILE, $_[0]) || return 0;
while(<ARFILE>) {
s/\r|\n//g;
if (!/^#/ && /^([^=]*)=(.*)$/) {
$_[1]->{$_[3] ? lc($1) : $1} = $2;
push(@{$_[2]}, $1) if ($_[2]);
}
}
close(ARFILE);
return 1;
}
# write_file(file, array)
# Write out the contents of an associative array as name=value lines
sub write_file
{
local(%old, @order);
&read_file($_[0], \%old, \@order);
open(ARFILE, ">$_[0]");
foreach $k (@order) {
print ARFILE $k,"=",$_[1]->{$k},"\n" if (exists($_[1]->{$k}));
}
foreach $k (keys %{$_[1]}) {
print ARFILE $k,"=",$_[1]->{$k},"\n" if (!exists($old{$k}));
}
close(ARFILE);
}
# execute_ready_webmin_crons(run-count)
# Find and run any cron jobs that are due, based on their last run time and
# execution interval
sub execute_ready_webmin_crons
{
my ($runs) = @_;
my $now = time();
my $changed = 0;
foreach my $cron (@webmincrons) {
my $run = 0;
if ($runs == 0 && $cron->{'boot'}) {
# If cron job wants to be run at startup, run it now
$run = 1;
}
elsif ($cron->{'disabled'}) {
# Explicitly disabled
$run = 0;
}
elsif (!$webmincron_last{$cron->{'id'}}) {
# If not ever run before, don't run right away
$webmincron_last{$cron->{'id'}} = $now;
$changed = 1;
}
elsif ($cron->{'interval'} &&
$now - $webmincron_last{$cron->{'id'}} > $cron->{'interval'}) {
# Older than interval .. time to run
$run = 1;
}
elsif ($cron->{'mins'} ne '') {
# Check if current time matches spec, and we haven't run in the
# last minute
my @tm = localtime($now);
if (&matches_cron($cron->{'mins'}, $tm[1], 0) &&
&matches_cron($cron->{'hours'}, $tm[2], 0) &&
&matches_cron($cron->{'days'}, $tm[3], 1) &&
&matches_cron($cron->{'months'}, $tm[4]+1, 1) &&
&matches_cron($cron->{'weekdays'}, $tm[6], 0) &&
$now - $webmincron_last{$cron->{'id'}} > 60) {
$run = 1;
}
}
if ($run) {
print DEBUG "Running cron id=$cron->{'id'} ".
"module=$cron->{'module'} func=$cron->{'func'} ".
"arg0=$cron->{'arg0'}\n";
$webmincron_last{$cron->{'id'}} = $now;
$changed = 1;
my $pid = &execute_webmin_command($config{'webmincron_wrapper'},
[ $cron ]);
push(@childpids, $pid);
}
}
if ($changed) {
# Write out file containing last run times
&write_file($config{'webmincron_last'}, \%webmincron_last);
}
}
# matches_cron(cron-spec, time, first-value)
# Checks if some minute or hour matches some cron spec, which can be * or a list
# of numbers.
sub matches_cron
{
my ($spec, $tm, $first) = @_;
if ($spec eq '*') {
return 1;
}
else {
foreach my $s (split(/,/, $spec)) {
if ($s == $tm ||
$s =~ /^(\d+)\-(\d+)$/ &&
$tm >= $1 && $tm <= $2 ||
$s =~ /^\*\/(\d+)$/ &&
$tm % $1 == $first ||
$s =~ /^(\d+)\-(\d+)\/(\d+)$/ &&
$tm >= $1 && $tm <= $2 && $tm % $3 == $first) {
return 1;
}
}
return 0;
}
}
# read_webmin_crons()
# Read all scheduled webmin cron functions and store them in the @webmincrons
# global list
sub read_webmin_crons
{
@webmincrons = ( );
opendir(CRONS, $config{'webmincron_dir'});
print DEBUG "Reading crons from $config{'webmincron_dir'}\n";
foreach my $f (readdir(CRONS)) {
if ($f =~ /^(\d+)\.cron$/) {
my %cron;
&read_file("$config{'webmincron_dir'}/$f", \%cron);
$cron{'id'} = $1;
my $broken = 0;
foreach my $n ('module', 'func') {
if (!$cron{$n}) {
print STDERR "Cron $1 missing $n\n";
$broken = 1;
}
}
if (!$cron{'interval'} && $cron{'mins'} eq '' &&
$cron{'special'} eq '' && !$cron{'boot'}) {
print STDERR "Cron $1 missing any time spec\n";
$broken = 1;
}
if ($cron{'special'} eq 'hourly') {
# Run every hour on the hour
$cron{'mins'} = 0;
$cron{'hours'} = '*';
$cron{'days'} = '*';
$cron{'months'} = '*';
$cron{'weekdays'} = '*';
}
elsif ($cron{'special'} eq 'daily') {
# Run every day at midnight
$cron{'mins'} = 0;
$cron{'hours'} = '0';
$cron{'days'} = '*';
$cron{'months'} = '*';
$cron{'weekdays'} = '*';
}
elsif ($cron{'special'} eq 'monthly') {
# Run every month on the 1st
$cron{'mins'} = 0;
$cron{'hours'} = '0';
$cron{'days'} = '1';
$cron{'months'} = '*';
$cron{'weekdays'} = '*';
}
elsif ($cron{'special'} eq 'weekly') {
# Run every month on the 1st
$cron{'mins'} = 0;
$cron{'hours'} = '0';
$cron{'days'} = '*';
$cron{'months'} = '*';
$cron{'weekdays'} = '0';
}
elsif ($cron{'special'} eq 'yearly' ||
$cron{'special'} eq 'annually') {
# Run every year on 1st january
$cron{'mins'} = 0;
$cron{'hours'} = '0';
$cron{'days'} = '1';
$cron{'months'} = '1';
$cron{'weekdays'} = '*';
}
elsif ($cron{'special'}) {
print STDERR "Cron $1 invalid special time $cron{'special'}\n";
$broken = 1;
}
if ($cron{'special'}) {
delete($cron{'special'});
}
if (!$broken) {
print DEBUG "Adding cron id=$cron{'id'} module=$cron{'module'} func=$cron{'func'} arg0=$cron{'arg0'}\n";
push(@webmincrons, \%cron);
}
}
}
closedir(CRONS);
}
# precache_files()
# Read into the Webmin cache all files marked for pre-caching
sub precache_files
{
undef(%main::read_file_cache);
foreach my $g (split(/\s+/, $config{'precache'})) {
next if ($g eq "none");
foreach my $f (glob("$config{'root'}/$g")) {
my @st = stat($f);
next if (!@st);
$main::read_file_cache{$f} = { };
&read_file($f, $main::read_file_cache{$f});
$main::read_file_cache_time{$f} = $st[9];
}
}
}
# Check if some address is valid IPv4, returns 1 if so.
sub check_ipaddress
{
return $_[0] =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/ &&
$1 >= 0 && $1 <= 255 &&
$2 >= 0 && $2 <= 255 &&
$3 >= 0 && $3 <= 255 &&
$4 >= 0 && $4 <= 255;
}
# Check if some IPv6 address is properly formatted, and returns 1 if so.
sub check_ip6address
{
my @blocks = split(/:/, $_[0]);
return 0 if (@blocks == 0 || @blocks > 8);
my $ib = $#blocks;
my $where = index($blocks[$ib],"/");
my $m = 0;
if ($where != -1) {
my $b = substr($blocks[$ib],0,$where);
$m = substr($blocks[$ib],$where+1,length($blocks[$ib])-($where+1));
$blocks[$ib]=$b;
}
return 0 if ($m <0 || $m >128);
my $b;
my $empty = 0;
foreach $b (@blocks) {
return 0 if ($b ne "" && $b !~ /^[0-9a-f]{1,4}$/i);
$empty++ if ($b eq "");
}
return 0 if ($empty > 1 && !($_[0] =~ /^::/ && $empty == 2));
return 1;
}
# network_to_address(binary)
# Given a network address in binary IPv4 or v4 format, return the string form
sub network_to_address
{
local ($addr) = @_;
if (length($addr) == 4 || !$use_ipv6) {
return inet_ntoa($addr);
}
else {
return inet_ntop(AF_INET6(), $addr);
}
}
# redirect_stderr_to_log()
# Re-direct STDERR to error log file
sub redirect_stderr_to_log
{
if ($config{'errorlog'} ne '-') {
open(STDERR, ">>$config{'errorlog'}") ||
die "failed to open $config{'errorlog'} : $!";
if ($config{'logperms'}) {
chmod(oct($config{'logperms'}), $config{'errorlog'});
}
}
select(STDERR); $| = 1; select(STDOUT);
}
# should_gzip_file(filename)
# Returns 1 if some path should be gzipped
sub should_gzip_file
{
my ($path) = @_;
return $path !~ /\.(gif|png|jpg|jpeg|tif|tiff)$/i;
}
# get_expires_time(path)
# Given a URL path, return the client-side expiry time in seconds
sub get_expires_time
{
my ($path) = @_;
foreach my $pe (@expires_paths) {
if ($path =~ /$pe->[0]/i) {
return $pe->[1];
}
}
return $config{'expires'};
}
sub html_escape
{
my ($tmp) = @_;
$tmp =~ s/&/&/g;
$tmp =~ s/</</g;
$tmp =~ s/>/>/g;
$tmp =~ s/\"/"/g;
$tmp =~ s/\'/'/g;
$tmp =~ s/=/=/g;
return $tmp;
}
sub html_strip
{
my ($tmp) = @_;
$tmp =~ s/<[^>]*>//g;
return $tmp;
}
# validate_twofactor(username, token, orig-username)
# Checks if a user's two-factor token is valid or not. Returns undef on success
# or the error message on failure.
sub validate_twofactor
{
my ($user, $token, $origuser) = @_;
local $uinfo = &get_user_details($user, $origuser);
$token =~ s/^\s+//;
$token =~ s/\s+$//;
$token || return "No two-factor token entered";
$uinfo->{'twofactor_provider'} || return undef;
pipe(TOKENr, TOKENw);
my $pid = &execute_webmin_command($config{'twofactor_wrapper'},
[ $user, $uinfo->{'twofactor_provider'}, $uinfo->{'twofactor_id'},
$token, $uinfo->{'twofactor_apikey'} ],
TOKENw);
close(TOKENw);
waitpid($pid, 0);
my $ex = $?;
my $out = <TOKENr>;
close(TOKENr);
if ($ex) {
return $out || "Unknown two-factor authentication failure";
}
return undef;
}
# execute_webmin_command(command, &argv, [stdout-fd])
# Run some Webmin script in a sub-process, like webmincron.pl
# Returns the PID of the new process.
sub execute_webmin_command
{
my ($cmd, $argv, $fd) = @_;
my $pid = fork();
if (!$pid) {
# Run via a wrapper command, which we run like a CGI
dbmclose(%sessiondb);
if ($fd) {
open(STDOUT, ">&$fd");
}
else {
open(STDOUT, ">&STDERR");
}
&close_all_sockets();
&close_all_pipes();
close(LISTEN);
# Setup CGI-like environment
$envtz = $ENV{"TZ"};
$envuser = $ENV{"USER"};
$envpath = $ENV{"PATH"};
$envlang = $ENV{"LANG"};
$envroot = $ENV{"SystemRoot"};
$envperllib = $ENV{'PERLLIB'};
foreach my $k (keys %ENV) {
delete($ENV{$k});
}
$ENV{"PATH"} = $envpath if ($envpath);
$ENV{"TZ"} = $envtz if ($envtz);
$ENV{"USER"} = $envuser if ($envuser);
$ENV{"OLD_LANG"} = $envlang if ($envlang);
$ENV{"SystemRoot"} = $envroot if ($envroot);
$ENV{'PERLLIB'} = $envperllib if ($envperllib);
$ENV{"HOME"} = $user_homedir;
$ENV{"SERVER_SOFTWARE"} = $config{"server"};
$ENV{"SERVER_ADMIN"} = $config{"email"};
$root0 = $roots[0];
$ENV{"SERVER_ROOT"} = $root0;
$ENV{"SERVER_REALROOT"} = $root0;
$ENV{"SERVER_PORT"} = $config{'port'};
$ENV{"WEBMIN_CRON"} = 1;
$ENV{"DOCUMENT_ROOT"} = $root0;
$ENV{"THEME_ROOT"} = $root0."/".$config{"preroot"};
$ENV{"THEME_DIRS"} = $config{"preroot"} || "";
$ENV{"DOCUMENT_REALROOT"} = $root0;
$ENV{"MINISERV_CONFIG"} = $config_file;
$ENV{"HTTPS"} = "ON" if ($use_ssl);
$ENV{"SSL_HSTS"} = $config{"ssl_hsts"};
$ENV{"MINISERV_PID"} = $miniserv_main_pid;
$ENV{"SCRIPT_FILENAME"} = $cmd;
if ($ENV{"SCRIPT_FILENAME"} =~ /^\Q$root0\E(\/.*)$/) {
$ENV{"SCRIPT_NAME"} = $1;
}
$cmd =~ /^(.*)\//;
$ENV{"PWD"} = $1;
foreach $k (keys %config) {
if ($k =~ /^env_(\S+)$/) {
$ENV{$1} = $config{$k};
}
}
chdir($ENV{"PWD"});
$SIG{'CHLD'} = 'DEFAULT';
eval {
# Have SOCK closed if the perl exec's something
use Fcntl;
fcntl(SOCK, F_SETFD, FD_CLOEXEC);
};
# Run the wrapper script by evaling it
if ($cmd =~ /\/([^\/]+)\/([^\/]+)$/) {
$pkg = $1;
}
$0 = $cmd;
@ARGV = @$argv;
$main_process_id = $$;
eval "
\%pkg::ENV = \%ENV;
package $pkg;
do \"$cmd\";
die \$@ if (\$@);
";
if ($@) {
print STDERR "Perl failure : $@\n";
}
exit(0);
}
return $pid;
}
# canonicalize_ip6(address)
# Converts an address to its full long form. Ie. 2001:db8:0:f101::20 to
# 2001:0db8:0000:f101:0000:0000:0000:0020
sub canonicalize_ip6
{
my ($addr) = @_;
return $addr if (!&check_ip6address($addr));
my @w = split(/:/, $addr);
my $idx = &indexof("", @w);
if ($idx >= 0) {
# Expand ::
my $mis = 8 - scalar(@w);
my @nw = @w[0..$idx];
for(my $i=0; $i<$mis; $i++) {
push(@nw, 0);
}
push(@nw, @w[$idx+1 .. $#w]);
@w = @nw;
}
foreach my $w (@w) {
while(length($w) < 4) {
$w = "0".$w;
}
}
return lc(join(":", @w));
}
# expand_ipv6_bytes(address)
# Given a canonical IPv6 address, split it into an array of bytes
sub expand_ipv6_bytes
{
my ($addr) = @_;
my @rv;
foreach my $w (split(/:/, $addr)) {
$w =~ /^(..)(..)$/ || return ( );
push(@rv, hex($1), hex($2));
}
return @rv;
}
sub get_somaxconn
{
return defined(&SOMAXCONN) ? SOMAXCONN : 128;
}
sub is_bad_header
{
my ($value, $name) = @_;
return $value =~ /^\s*\(\s*\)\s*\{/ ? 1 : 0;
}
# sysread_line(fh)
# Read a line from a file handle, using sysread to get a byte at a time
sub sysread_line
{
local ($fh) = @_;
local $line;
while(1) {
local ($buf, $got);
$got = sysread($fh, $buf, 1);
last if ($got <= 0);
$line .= $buf;
last if ($buf eq "\n");
}
return $line;
}
# getenv(env_key)
# Returns env var disregard of case
sub getenv
{
my ($key) = @_;
return $ENV{ uc($key) } || $ENV{ lc($key) };
}
# open_socket(host, port, filehandle)
# Connect to a TCP port on some host. Returns undef on success, or an error
# message on failure.
sub open_socket
{
my ($host, $port, $fh) = @_;
# Lookup all IPv4 and v6 addresses for the host
my @ips = &to_ipaddress($host);
push(@ips, &to_ip6address($host));
if (!@ips) {
return "Failed to lookup IP address for $host";
}
# Try each of the resolved IPs
my $msg;
my $proto = getprotobyname("tcp");
foreach my $ip (@ips) {
$msg = undef;
if (&check_ipaddress($ip)) {
# Create IPv4 socket and connection
if (!socket($fh, PF_INET(), SOCK_STREAM, $proto)) {
$msg = "Failed to create socket : $!";
next;
}
my $addr = inet_aton($ip);
if ($gconfig{'bind_proxy'}) {
# BIND to outgoing IP
if (!bind($fh, pack_sockaddr_in(0, inet_aton($bindip)))) {
$msg = "Failed to bind to source address : $!";
next;
}
}
if (!connect($fh, pack_sockaddr_in($port, $addr))) {
$msg = "Failed to connect to $host:$port : $!";
next;
}
}
else {
# Create IPv6 socket and connection
if (!&supports_ipv6()) {
$msg = "IPv6 connections are not supported";
next;
}
if (!socket($fh, PF_INET6(), SOCK_STREAM, $proto)) {
$msg = "Failed to create IPv6 socket : $!";
next;
}
my $addr = inet_pton(AF_INET6(), $ip);
if (!connect($fh, pack_sockaddr_in6($port, $addr))) {
$msg = "Failed to IPv6 connect to $host:$port : $!";
next;
}
}
last; # If we got this far, it worked
}
if ($msg) {
# Last attempt failed
return $msg;
}
# Disable buffering
my $old = select($fh);
$| = 1;
select($old);
return undef;
}