Viewing file:  link.cgi (6.32 KB) -rwxr-xr-x
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#!/usr/bin/perl
# link.cgi
# Forward the URL from path_info on to another webmin server
use strict;
use warnings;
our (%config, %text, %module_info, %in, %gconfig, $module_name);
require './tunnel-lib.pl';
$ENV{'PATH_INFO'} =~ /^\/(http|https):\/+([^:\/]+)(:(\d+))?(.*)$/ ||
&error("Bad PATH_INFO : $ENV{'PATH_INFO'}");
my $protocol = $1;
my $ssl = $protocol eq "https";
my $host = $2;
my $port = $4 || ( !$ssl ? 80 : 443 );
my $path = $5 || "/";
my $openurl = "$1://$2$3$5";
my $baseurl = "$1://$2$3";
if ($ENV{'QUERY_STRING'}) {
$path .= '?'.$ENV{'QUERY_STRING'};
}
elsif (@ARGV) {
$path .= '?'.join('+', @ARGV);
}
my $linkurl = $gconfig{'webprefix'}."/$module_name/link.cgi/";
my $url = $gconfig{'webprefix'}."/$module_name/link.cgi/$openurl";
$| = 1;
my $meth = $ENV{'REQUEST_METHOD'};
if ($config{'url'}) {
$openurl = &fix_end_url($config{'url'}) || &error($text{'seturl_eurl'});
}
my ($user, $pass);
if ($config{'loginmode'} == 2) {
# Login is variable .. check if we have it yet
if ($ENV{'HTTP_COOKIE'} =~ /tunnel=([^\s;]+)/) {
# Yes - set the login and password to use
($user, $pass) = split(/:/, &decode_base64("$1"));
}
else {
# No - need to display a login form
&ui_print_header(undef, $text{'login_title'}, "");
print "<center>\n";
print &text('login_desc', "<tt>$openurl</tt>"),"<p>\n";
print &ui_form_start("/$module_name/login.cgi", "post");
print &ui_hidden("url", $openurl);
print &ui_table_start($text{'login_header'}, undef, 2);
print &ui_table_row($text{'login_user'},
&ui_textbox("user", undef, 20));
print &ui_table_row($text{'login_pass'},
&ui_password("pass", undef, 20));
print &ui_table_end();
print &ui_form_end([ [ undef, $text{'login_login'} ] ]);
print "</center>\n";
&ui_print_footer("", $text{'index_return'});
exit;
}
}
elsif ($config{'loginmode'} == 1) {
# Login is fixed
$user = $config{'user'};
$pass = $config{'pass'};
}
# Connect to the server
my $con = &make_http_connection($host, $port, $ssl, $meth, $path);
&error($con) if (!ref($con));
# Send request headers
&write_http_connection($con, "Host: $host\r\n");
&write_http_connection($con, "User-Agent: Webmin\r\n");
if ($user) {
my $auth = &encode_base64("$user:$pass");
$auth =~ s/\n//g;
&write_http_connection($con, "Authorization: basic $auth\r\n");
}
&write_http_connection($con, sprintf(
"Webmin-servers: %s://%s:%d/$module_name/\r\n",
$ENV{'HTTPS'} eq "ON" ? "https" : "http",
$ENV{'SERVER_NAME'}, $ENV{'SERVER_PORT'}));
my $cl = $ENV{'CONTENT_LENGTH'};
&write_http_connection($con, "Content-Length: $cl\r\n") if ($cl);
&write_http_connection($con, "Content-Type: $ENV{'CONTENT_TYPE'}\r\n")
if ($ENV{'CONTENT_TYPE'});
&write_http_connection($con, "\r\n");
if ($cl) {
my $post;
&read_fully(\*STDIN, \$post, $cl);
&write_http_connection($con, $post);
}
# read back the headers
my $dummy = &read_http_connection($con);
my ($headers, %header);
while(1) {
my $headline;
($headline = &read_http_connection($con)) =~ s/\r|\n//g;
last if (!$headline);
$headline =~ /^(\S+):\s+(.*)$/ || &error("Bad header");
$header{lc($1)} = $2;
$headers .= $headline."\n";
}
my $defport = $ssl ? 443 : 80;
if ($header{'location'}) {
# fix a redirect
&redirect("/$module_name/link.cgi/$header{'location'}");
exit;
}
if ($header{'location'} =~ /^(http|https):\/\/$host:$port$path(.*)$/ ||
$header{'location'} =~ /^(http|https):\/\/$host$path(.*)/ &&
$port == $defport) {
# fix a redirect
&redirect("$url/$2");
exit;
}
elsif ($header{'www-authenticate'}) {
# Invalid login
if ($config{'loginmode'} == 2) {
print "Set-Cookie: tunnel=; path=/\n";
&error(&text('link_eautologin', "<tt>$openurl</tt>",
"/$module_name/link.cgi/$path"));
}
elsif ($user) {
&error(&text('link_elogin', $host, $user)." ".
&text('link_mconfig',
"$gconfig{'webprefix'}/config.cgi?$module_name"));
}
else {
&error(&text('link_enouser', $host)." ".
&text('link_mconfig',
"$gconfig{'webprefix'}/config.cgi?$module_name"));
}
}
else {
# just output the headers
print $headers,"\n";
}
# read back the rest of the page
if ($header{'content-type'} =~ /text\/html/ && !$header{'x-no-links'}) {
while($_ = &read_http_connection($con)) {
# fix protocol relative src like <iframe src='//foo.com' />
s/src='(\/\/[^']*)'/src='$protocol:$1'/gi;
s/src="(\/\/[^"]*)"/src="$protocol:$1"/gi;
s/src=(\/\/[^ "'>]*)/src=$protocol:$1/gi;
# Fix protocol relative hrefs like <a href=//foo.com/foo.html>
s/href='(\/\/[^']*)'/href='$protocol:$1'/gi;
s/href="(\/\/[^"]*)"/href="$protocol:$1"/gi;
s/href=(\/\/[^ "'>]*)/href=$protocol:$1/gi;
# Fix protocol relative form actions like <form action=//foo.com>
s/action='(\/\/[^']*)'/action='$protocol:$1'/gi;
s/action="(\/\/[^"]*)"/action="$protocol:$1"/gi;
s/action=(\/\/[^ "'>]*)/action=$protocol:$1/gi;
# Fix absolute image links like <img src=/foo.gif>
s/src='(\/[^']*)'/src='$baseurl$1'/gi;
s/src="(\/[^"]*)"/src="$baseurl$1"/gi;
s/src=(\/[^ "'>]*)/src=$baseurl$1/gi;
# Fix offsite image links <img src=http://www.blah.com/foo.gif>
s/src='((http|https):\/\/[^']*)'/src='$linkurl$1'/gi;
s/src="((http|https):\/\/[^"]*)"/src="$linkurl$1"/gi;
s/src=((http|https):\/\/[^ "'>]*)/src=$linkurl$1/gi;
# Fix absolute hrefs like <a href=/foo.html>
s/href='(\/[^']*)'/href='$baseurl$1'/gi;
s/href="(\/[^"]*)"/href="$baseurl$1"/gi;
s/href=(\/[^ "'>]*)/href=$baseurl$1/gi;
# Fix offsite hrefs like <a href=http://www.blah.com/>
s/href='((http|https):\/\/[^']*)'/href='$linkurl$1'/gi;
s/href="((http|https):\/\/[^"]*)"/href="$linkurl$1"/gi;
s/href=((http|https):\/\/[^ "'>]*)/href=$linkurl$1/gi;
# Fix absolute form actions like <form action=/foo>
s/action='(\/[^']*)'/action='$baseurl$1'/gi;
s/action="(\/[^"]*)"/action="$baseurl$1"/gi;
s/action=(\/[^ "'>]*)/action=$baseurl$1/gi;
# Fix offsite form actions
s/action='((http|https):\/\/[^']*)'/action='$linkurl$1'/gi;
s/action="((http|https):\/\/[^"]*)"/action="$linkurl$1"/gi;
s/action=((http|https):\/\/[^ "'>]*)/action=$linkurl$1/gi;
#s/\.location\s*=\s*'$path([^']*)'/.location='$url\/$1'/gi;
#s/\.location\s*=\s*"$path([^']*)"/.location="$url\/$1"/gi;
#s/window.open\("$path([^"]*)"/window.open\("$url\/$1"/gi;
#s/name=return\s+value="$path([^"]*)"/name=return value="$url\/$1"/gi;
print;
}
}
else {
while(my $buf = &read_http_connection($con,1024)) {
print $buf;
}
}
&close_http_connection($con);
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