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https://github.com/rspamd/rspamd.git
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603 lines
15 KiB
Perl
Executable File
603 lines
15 KiB
Perl
Executable File
#!/usr/bin/env perl
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use warnings;
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use strict;
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# Required ports:
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# www/p5-POE-Component-Client-HTTP
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# www/p5-POE-Component-Server-HTTP
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# dns/p5-POE-Component-Client-DNS
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# databases/p5-Cache-Memcached-Fast
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# devel/p5-Proc-Daemon
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# sysutils/p5-Proc-PidUtil
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# POE::Component::Client::HTTP uses HTTP::Request and response
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# objects.
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use POSIX qw(strftime);
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use HTTP::Request::Common qw(GET POST);
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use HTTP::Response;
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use URI::Escape qw(uri_unescape);
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use Sys::Syslog qw/:standard :macros setlogsock/;
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use HTML::HeadParser;
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use Digest;
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use Proc::Daemon;
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use Proc::PidUtil;
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use POE qw(@POE_LOOP@ Component::Server::TCP Filter::HTTPD Component::Client::HTTP);
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use Redis::Fast;
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my $with_swf = 1;
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my $swf_parser;
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my $saved_swf_url = "";
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eval "require SWF::Element" or $with_swf = 0; # p5-SWF-File
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my $DEBUG = grep { $_ eq '-debug' } @ARGV;
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our %cfg = (
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port => 8080,
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max_size => 102400,
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http_timeout => 5,
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max_rec => 5,
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pidfile => '/tmp/redirector.pid',
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do_log => 0,
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debug => 0,
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redis_server => 'localhost:6379',
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facility => LOG_LOCAL3, # syslog facility
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log_level => LOG_INFO,
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digest_bits => 256,
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cache_expire => 3600,
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user => '@RSPAMD_USER@',
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group => '@RSPAMD_GROUP@',
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cfg_file => '@CMAKE_INSTALL_PREFIX@/etc/rspamd-redirector.conf',
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);
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our $do_reopen_log = 0;
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our $redis_conn;
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############################################ Subs ########################################
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# Read file into string
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sub read_file {
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my ($file) = @_;
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open( IN, $file ) or _log( LOG_ALERT, "Can't open $file: $!" );
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local $/;
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my $content = <IN>;
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close IN;
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return $content;
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}
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# Write log line:
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sub _log {
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my ( $l, $w, @s ) = @_;
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if ($DEBUG) {
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printf STDERR $w . "\n", @s;
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}
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else {
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syslog( $l, $w . "\n", @s ) if ( $l <= $cfg{'log_level'} );
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}
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if ( $l == LOG_ALERT ) {
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die $w;
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}
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}
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# Init swf parser
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sub swf_init_parser {
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if ($with_swf) {
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$swf_parser = SWF::Parser->new( 'tag-callback' => \&swf_tag_callback );
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}
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}
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# Checking for SWF url
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sub swf_search_get_url {
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my $actions = shift;
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my $saved_pool_str = "";
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for my $action (@$actions) {
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if ( $action->tag_name eq 'ActionConstantPool' ) {
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my $pool = $action->ConstantPool;
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for my $string (@$pool) {
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if ( $string =~ /^https?:\/\// ) {
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$saved_pool_str = $string->value;
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}
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}
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}
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elsif ( $action->tag_name eq 'ActionGetURL2' ) {
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if ( $saved_pool_str ne "" ) {
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$saved_swf_url = $saved_pool_str;
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}
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}
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elsif ( $action->tag_name =~ 'ActionGetURL' ) {
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$saved_swf_url = $action->UrlString->value;
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}
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}
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}
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# SWF check tag utility
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sub swf_check_tag {
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my ( $t, $stream ) = @_;
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my ($tagname) = $t->tag_name;
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for ($tagname) {
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( /^Do(Init)?Action$/ or /^DefineButton$/ ) and do {
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swf_search_get_url( $t->Actions );
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last;
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};
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/^PlaceObject2$/ and do {
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for my $ca ( @{ $t->ClipActions } ) {
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swf_search_get_url( $ca->Actions );
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}
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last;
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};
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/^DefineButton2$/ and do {
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for my $ba ( @{ $t->Actions } ) {
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swf_search_get_url( $ba->Actions );
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}
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last;
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};
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/^DefineSprite$/ and do {
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for my $tag ( @{ $t->ControlTags } ) {
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swf_search_get_url( $tag, $stream );
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}
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last;
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};
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}
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}
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# Callback for swf parser
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sub swf_tag_callback {
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my ( $self, $tag, $length, $stream ) = @_;
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my $t = SWF::Element::Tag->new( Tag => $tag, Length => $length );
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my ($tagname) = $t->tag_name;
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return
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unless $tagname eq 'DoAction'
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or $tagname eq 'DoInitAction'
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or $tagname eq 'PlaceObject2'
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or $tagname eq 'DefineButton'
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or $tagname eq 'DefineButton2'
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or $tagname eq 'DefineSprite';
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if ( $tagname eq 'DefineSprite' ) {
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# Tags in the sprite are not unpacked here.
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$t->shallow_unpack($stream);
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$t->TagStream->parse( callback => \&swf_tag_callback );
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return;
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}
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elsif ( $tagname eq 'PlaceObject2' ) {
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# Most of PlaceObject2 tags don't have ClipActions.
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$t->lookahead_Flags($stream);
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return unless $t->PlaceFlagHasClipActions;
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}
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# unpack the tag and search actions.
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$t->unpack($stream);
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swf_check_tag($t);
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}
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# Check url from redis cache first
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sub redis_check_url {
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my ($url) = @_;
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my $context = Digest->new("SHA-512");
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$context->add($url);
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return $redis_conn->get( $context->digest() );
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}
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# Write url to redis key
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sub redis_cache_url {
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my ( $url, $url_real ) = @_;
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if ( $url ne $url_real ) {
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my $context = Digest->new("SHA-512");
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$context->add($url);
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if (!$redis_conn->setex( $context->digest(), $cfg{cache_expire}, $url_real)) {
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_log(LOG_INFO, "cannot save redirect from $url to $url_real in redis");
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}
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}
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}
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sub create_response {
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my ( $code, $uri ) = @_;
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my $new_response;
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if ($uri) {
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$new_response = HTTP::Response->new( $code, 'OK' );
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$new_response->header( "Uri", $uri );
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$new_response->content($uri);
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$new_response->content_length( length($uri) );
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}
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else {
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$new_response = HTTP::Response->new($code);
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$new_response->content_length(0);
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}
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$new_response->header( "Connection", "Close" );
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$new_response->header( "Proxy-Connection", "Close" );
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return $new_response;
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}
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# POE http client callback
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sub process_client {
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my ( $kernel, $heap ) = @_[ KERNEL, HEAP ];
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my $http_request = $_[ARG0]->[0];
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my $rec = $_[ARG0]->[1][0];
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my $http_response = $_[ARG1]->[0];
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my $base_url = $_[ARG0]->[1][1];
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$saved_swf_url = "";
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if ( $rec == 0 ) {
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$base_url = $http_request->uri;
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}
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else {
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# Check cache for each url
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my $redirect = redis_check_url( $http_request->uri );
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if ($redirect) {
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_log( LOG_INFO,
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"Memcached redirect from %s to %s for request from: %s",
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$http_response->base, $redirect, $heap->{remote_ip} );
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my $new_response = create_response( 200, $redirect );
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# Avoid sending the response if the client has gone away.
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$heap->{client}->put($new_response) if defined $heap->{client};
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# Shut down the client's connection when the response is sent.
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return;
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}
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}
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if ($do_reopen_log) {
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$do_reopen_log = 0;
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reopen_log();
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}
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if ( $rec > $cfg{max_rec} ) {
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_log( LOG_INFO,
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"Max recursion exceeded: %d from %s to %s for request from: %s",
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$rec, $base_url, $http_request->uri, $heap->{remote_ip} );
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# Write to cache
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redis_cache_url( $base_url, $http_request->uri );
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my $new_response = create_response( 200, $http_request->uri );
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# Avoid sending the response if the client has gone away.
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$heap->{client}->put($new_response) if defined $heap->{client};
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# Shut down the client's connection when the response is sent.
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$kernel->yield("shutdown");
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return;
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}
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# Detect HTTP redirects
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if ( $http_response->is_redirect ) {
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my $redirect = $http_response->header('Location');
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if ($redirect) {
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if ( $redirect =~ /^https?:\/\// ) {
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_log( LOG_INFO,
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"HTML redirect from %s to %s for request from: %s",
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$http_response->base, $redirect, $heap->{remote_ip} );
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my $request = HTTP::Request->new( 'GET', $redirect );
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$request->header( "Connection", "close" );
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$request->header( "Proxy-Connection", "close" );
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$kernel->post( "cl", "request", "got_response", $request,
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[ $rec + 1, $base_url ] );
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return;
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}
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else {
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_log( LOG_INFO,
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"ignoring internal redirect from %s to %s for request from: %s",
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$http_request->uri,
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$redirect,
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$heap->{remote_ip}
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);
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my $new_response = create_response( 200, $http_request->uri );
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# Avoid sending the response if the client has gone away.
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$heap->{client}->put($new_response) if defined $heap->{client};
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# Shut down the client's connection when the response is sent.
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$kernel->yield("shutdown");
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return;
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}
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}
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}
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elsif ( $http_response->code != 200 ) {
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_log( LOG_INFO, "HTTP response was %d, for request to %s",
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$http_response->code, $http_request->uri );
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my $new_response;
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if ($rec == 0) {
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$new_response = create_response( $http_response->code );
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}
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else {
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redis_cache_url( $base_url, $http_request->uri );
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$new_response = create_response( 200, $http_request->uri );
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}
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# Avoid sending the response if the client has gone away.
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$heap->{client}->put($new_response) if defined $heap->{client};
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# Shut down the client's connection when the response is sent.
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$kernel->yield("shutdown");
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return;
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}
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my $response_type = $http_response->content_type();
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if ( $response_type =~ /^text/i ) {
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my $content = $http_response->decoded_content();
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my $p = HTML::HeadParser->new($http_response);
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$p->parse($content);
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my $expire = $http_response->header('Refresh');
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if ( $http_response->is_redirect || $expire ) {
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my $redirect;
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if ($expire) {
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$expire =~ /URL=(\S+)/;
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$redirect = $1;
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}
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else {
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$redirect = $http_response->header('Location');
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}
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if ($redirect) {
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if ( $redirect =~ /^https?:\/\// ) {
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_log( LOG_INFO,
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"HTML redirect from %s to %s for request from: %s",
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$http_response->base,
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$redirect,
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$heap->{remote_ip}
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);
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my $request = HTTP::Request->new( 'GET', $redirect );
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$request->header( "Connection", "close" );
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$request->header( "Proxy-Connection", "close" );
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$kernel->post( "cl", "request", "got_response", $request,
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[ $rec + 1, $base_url ] );
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return;
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}
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else {
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_log( LOG_INFO,
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"ignoring internal redirect from %s to %s for request from: %s",
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$http_response->base,
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$redirect,
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$heap->{remote_ip}
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);
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}
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}
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}
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if ( $content =~ /location\s*=\s*["']*(https?:\/\/[^"'\s]+)["']*/im ) {
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my $redir = uri_unescape($1);
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_log( LOG_INFO, "js redirect from %s to %s for request from: %s",
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$http_response->base, $1, $heap->{remote_ip} );
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my $request = HTTP::Request->new( 'GET', $redir );
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$request->header( "Connection", "close" );
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$request->header( "Proxy-Connection", "close" );
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$kernel->post( "cl", "request", "got_response", $request,
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[ $rec + 1, $base_url ] );
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return;
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}
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}
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elsif (
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$with_swf
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&& (
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$response_type eq 'application/x-shockwave-flash'
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|| ( $http_request->uri =~ /\.swf(\?.*)?$/i
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&& $http_response->code == 200 )
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)
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)
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{
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my $content = $http_response->decoded_content();
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$swf_parser->parse($content);
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if ( $saved_swf_url ne "" ) {
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_log( LOG_INFO, "flash redirect from %s to %s for request from: %s",
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$http_response->base, $saved_swf_url, $heap->{remote_ip} );
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my $request = HTTP::Request->new( 'GET', $saved_swf_url );
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# Reset swf redirect global variable
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$saved_swf_url = "";
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$request->header( "Connection", "close" );
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$request->header( "Proxy-Connection", "close" );
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$kernel->post( "cl", "request", "got_response", $request,
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[ $rec + 1, $base_url ] );
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return;
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}
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}
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else {
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_log( LOG_INFO,
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"response wasn't text request from: %s, response is: %s",
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$heap->{remote_ip}, $response_type );
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}
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_log( LOG_INFO, "redirect from %s to %s for request from: %s",
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$base_url, $http_request->uri, $heap->{remote_ip} );
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# Write to cache
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redis_cache_url( $base_url, $http_request->uri );
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my $new_response =
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create_response( $http_response->code, $http_request->uri );
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# Avoid sending the response if the client has gone away.
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$heap->{client}->put($new_response) if defined $heap->{client};
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# Shut down the client's connection when the response is sent.
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$kernel->yield("shutdown");
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}
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sub process_input {
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my ( $kernel, $heap, $request ) = @_[ KERNEL, HEAP, ARG0 ];
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if ( $request->isa("HTTP::Response") ) {
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$heap->{client}->put($request);
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$kernel->yield("shutdown");
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return;
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}
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my $domain;
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if ( $request->uri =~ /^http:\/\/([^\/]+)\// ) {
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my @parts = split( /\./, $1 );
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my $c1 = pop @parts;
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my $c2 = pop @parts;
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$domain = "$c2.$c1";
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}
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if (
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(
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defined( $cfg{check_regexp} ) && $request->uri !~ $cfg{check_regexp}
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)
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|| ( defined( $cfg{check_domains} )
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&& scalar( grep { $_ eq $domain } @{ $cfg{check_domains} } ) == 0 )
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)
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{
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my $new_response = create_response( 200, $request->uri );
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# Avoid sending the response if the client has gone away.
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$heap->{client}->put($new_response) if defined $heap->{client};
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$kernel->yield("shutdown");
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# Shut down the client's connection when the response is sent.
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return;
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}
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# Check cache first
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my $redirect = redis_check_url( $request->uri );
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if ($redirect) {
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_log( LOG_INFO, "Memcached redirect from %s to %s for request from: %s",
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$request->uri, $redirect, $heap->{remote_ip} );
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my $new_response = create_response( 200, $redirect );
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# Avoid sending the response if the client has gone away.
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$heap->{client}->put($new_response) if defined $heap->{client};
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$kernel->yield("shutdown");
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# Shut down the client's connection when the response is sent.
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return;
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}
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# Start http request
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my $new_request = HTTP::Request->new( 'GET', $request->uri );
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$new_request->header( "Connection", "close" );
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$new_request->header( "Proxy-Connection", "close" );
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$kernel->post( "cl", "request", "got_response", $new_request, [ 0, "" ] );
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}
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sub sig_DIE {
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my ( $sig, $ex ) = @_[ ARG0, ARG1 ];
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_log( LOG_ERR, "$$: error in $ex->{event}: $ex->{error_str}" );
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$poe_kernel->sig_handled();
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# Send the signal to session that sent the original event.
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if ( $ex->{source_session} ne $_[SESSION] ) {
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$poe_kernel->signal( $ex->{source_session}, 'DIE', $sig, $ex );
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}
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}
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sub sig_CLD {
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my ( $heap, $child_pid ) = @_[ HEAP, ARG1 ];
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return 0;
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}
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|
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############################### Main code fragment ##################################
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# Do daemonization
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if ( !$DEBUG ) {
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Proc::Daemon::Init;
|
|
POE::Kernel->has_forked;
|
|
setlogsock('unix');
|
|
openlog( 'redirector', 'ndelay,pid', $cfg{'facility'} );
|
|
}
|
|
|
|
# Try to eval config file
|
|
if ( -f $cfg{cfg_file} ) {
|
|
my $config = read_file( $cfg{cfg_file} );
|
|
eval $config;
|
|
}
|
|
|
|
_log( LOG_ALERT, "Process is already started, check $cfg{pidfile}" )
|
|
if Proc::PidUtil::is_running( $cfg{pidfile} );
|
|
|
|
# Drop privilleges
|
|
if ( $> == 0 ) {
|
|
my $uid = getpwnam( $cfg{user} )
|
|
or _log( LOG_ALERT, "user $cfg{user} unknown" );
|
|
my $gid = getgrnam( $cfg{group} )
|
|
or _log( LOG_ALERT, "group $cfg{group} unknown" );
|
|
$< = $> = $uid;
|
|
$) = $( = $gid;
|
|
}
|
|
|
|
if ( !$DEBUG ) {
|
|
_log( LOG_ALERT, "Cannot write to pidfile $cfg{pidfile}" )
|
|
if !open( PID, "> $cfg{pidfile}" );
|
|
close(PID);
|
|
}
|
|
|
|
# Reopen log on SIGUSR1
|
|
$poe_kernel->sig( DIE => \&sig_DIE );
|
|
$poe_kernel->sig( CLD => \&sig_CLD );
|
|
$SIG{USR1} = sub { $do_reopen_log = 1; $poe_kernel->sig_handled(); };
|
|
$SIG{INT} = sub { $poe_kernel->stop(); };
|
|
$SIG{QUIT} = sub { $poe_kernel->stop(); };
|
|
$SIG{PIPE} = 'IGNORE';
|
|
|
|
if ( !$DEBUG ) {
|
|
Proc::PidUtil::make_pidfile( $cfg{pidfile}, $$ )
|
|
or _log( LOG_ALERT, "Cannot write pidfile $cfg{pidfile}" );
|
|
}
|
|
|
|
# Init redis connection
|
|
_log( LOG_INFO, "Starting redis connection" );
|
|
$redis_conn = Redis::Fast->new(
|
|
server => $cfg{redis_server},
|
|
reconnect => 60,
|
|
every => 500_000,
|
|
encoding => undef,
|
|
);
|
|
|
|
# POE part
|
|
POE::Component::Client::HTTP->spawn(
|
|
Alias => 'cl',
|
|
MaxSize => $cfg{max_size}, # Remove for unlimited page sizes
|
|
Timeout => $cfg{http_timeout},
|
|
ConnectionManager => POE::Component::Client::Keepalive->new(
|
|
max_per_host => 256,
|
|
max_open => 1024,
|
|
keep_alive => 1,
|
|
timeout => $cfg{http_timeout},
|
|
),
|
|
);
|
|
|
|
_log( LOG_INFO, "Starting HTTP server" );
|
|
POE::Component::Server::TCP->new(
|
|
Alias => "",
|
|
Port => $cfg{port},
|
|
ClientFilter => 'POE::Filter::HTTPD',
|
|
|
|
ClientInput => \&process_input,
|
|
InlineStates => { got_response => \&process_client, },
|
|
);
|
|
|
|
swf_init_parser();
|
|
_log( LOG_NOTICE, "Starting URL resolver" );
|
|
|
|
# Start POE. This will run the server until it exits.
|
|
POE::Kernel->run();
|
|
exit 0;
|
|
|
|
############################## Final block ####################################
|
|
|
|
END {
|
|
_log( LOG_NOTICE, 'redirector stopped' );
|
|
closelog();
|
|
}
|