commit 4769cfbf359327bee98b19be2b103284a9c92806 Author: Dominik Meyer Date: Thu Feb 6 20:23:36 2025 +0100 chore: inital commit diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..7e14f38 --- /dev/null +++ b/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..d6aedc9 --- /dev/null +++ b/README.md @@ -0,0 +1,17 @@ +# QPSMTPD - MailserverInterface + +## DESCRIPTION + +QPSMTPD plugins for interfacing with the FederationHQ MailserverInterface daemon. + +## INSTALLATION + +Copy the plugins to the QPSMTPD plugin directory. + +## AUTHOR + +- Dominik Meyer + +## LICENSE + +GPLv3 \ No newline at end of file diff --git a/clamdscan b/clamdscan new file mode 100644 index 0000000..b3748e0 --- /dev/null +++ b/clamdscan @@ -0,0 +1,350 @@ +#!perl -w + +=head1 NAME + +clamdscan + +=head1 DESCRIPTION + +A qpsmtpd plugin for virus scanning using the ClamAV scan daemon, clamd. + +=head1 RESTRICTIONS + +If connecting to clamd via TCP/IP host:port, then ignore this restriction. + +The ClamAV scan daemon, clamd, must have at least execute access to the qpsmtpd +spool directory in order to sucessfully scan the messages. You can ensure this +by running clamd as the same user as qpsmtpd does, or by doing the following: + +=over 4 + +=item * Change the group ownership of the spool directory to be a group +of which clamav is a member or add clamav to the same group as the qpsmtpd +user. + +=item * Enable the "AllowSupplementaryGroups" option in clamd.conf. + +=item * Add group-execute permissions to the qpsmtpd spool directory. + +=item * Make sure that all directories above the spool directory (to the +root) are g+x so that the group has directory traversal rights; it is not +necessary for the group to have any read rights. + +=back + +It may be helpful to temporary grant the clamav user a shell and test to +make sure you can cd into the spool directory and read files located there. +Remember to remove the shell from the clamav user when you are done +testing. + +=head1 INSTALL AND CONFIG + +Place this plugin in the plugin/virus directory beneath the standard +qpsmtpd installation. If you installed clamd with the default path, you +can use this plugin with default options (nothing specified): + +You must have the ClamAV::Client module installed to use the plugin. + +=over 4 + +=item B + +Full path to the clamd socket, if different from the ClamAV::Client defaults. + +=item B + +IP address where clamd is listening. + +Default: localhost + +=item B + +The TCP port where the clamd service is running, typically 3310. + +Default: disabled. When present, overrides clamd_socket. + +=item B + +Whether the scanner will automatically delete messages which have viruses. +Takes either 'yes' or 'no'. If set to 'no', adds a header with the virus name. + +Default: yes + +=item B + +Whether to defer the mail (with a soft-failure error, which will incur a retry) +if an unrecoverable error occurs during the scan. The default is to accept +the mail under these conditions. This can permit viruses to be accepted when +the clamd daemon is malfunctioning or unreadable, but will not allow mail to +backlog or be lost if the condition persists. + +=item B + +The maximum size, in kilobytes, of messages to scan. + +Default: 1024 (1 MB) + +=item B + +Scan all messages, even if there are no attachments + +=back + +=head1 REQUIREMENTS + +This module requires the ClamAV::Client module, found on CPAN here: + +L + +=head1 AUTHOR + +Originally written for the Clamd module by John Peacock ; +adjusted for ClamAV::Client by Devin Carraway . + +=head1 COPYRIGHT AND LICENSE + + Copyright (c) 2005 John Peacock, + Copyright (c) 2007 Devin Carraway + Copyright (c) 2013 Matt Simerson + +Based heavily on the clamav plugin + +This plugin is licensed under the same terms as the qpsmtpd package itself. +Please see the LICENSE file included with qpsmtpd for details. + +=cut + +use strict; +use warnings; + +#use ClamAV::Client; # eval'ed in $self->register +use Socket qw(:DEFAULT :crlf); + +use Qpsmtpd::Constants; + +sub register { + my $self = shift; + my $qp = shift; + + $self->log(LOGERROR, "Bad parameters for the clamdscan plugin") if @_ % 2; + $self->{'_args'} = {@_}; + + eval 'use Net::ClamAV::Client'; ## no critic (Stringy) + if ($@) { + $self->log(LOGERROR, "unable to load Net::ClamAV::Client"); + return; + } + + # Set sensible defaults + $self->{_args}{max_size} ||= 1024; + if ( ! defined $self->{_args}{deny_viruses} ) { + $self->{_args}{deny_viruses} = 'yes'; + } + if ( ! defined $self->{_args}{scan_all} ) { + $self->{_args}{scan_all} = 1; + } + for my $setting (qw( deny_viruses defer_on_error scan_all )) { + next unless $self->{'_args'}{$setting}; + if (lc $self->{'_args'}{$setting} eq 'no') { + $self->{'_args'}{$setting} = 0; + } + } + + $self->register_hook('data_post', 'data_post_handler'); +} + +sub data_post_handler { + my ($self, $transaction) = @_; + + + if ($self->connection->notes('naughty')) { + $self->log(LOGINFO, "skip, naughty"); + return DECLINED; + } + return DECLINED if ! $self->should_scan($transaction); + + my $clamd = $self->get_clamd() + or return $self->err_and_return("Cannot instantiate ClamAV::Client"); + + unless ($clamd->ping() ) { + return $self->err_and_return("Cannot ping clamd server: $@"); + } + + my ($version) = split(/\//, $clamd->version); + $version ||= 'ClamAV'; + + my ($path, $found); + if ( $self->{_args}{clamd_port} ) { + my $message = $self->assemble_message($transaction); + $found = eval { $clamd->scanScalar(\$message) }; # pass scalar ref +# $found = eval { $clamd->scan_stream() }; # pass IO handle + } + else { + my $filename = $self->get_filename($transaction) or return DECLINED; + $self->set_permission($filename) or return DECLINED; + ($path, $found) = eval { $clamd->scan_path($filename) }; + }; + + if ($@) { + return $self->err_and_return("Error scanning mail: $@"); + } + + if ($found) { + $self->log(LOGNOTICE, "fail, found virus $found"); + + $self->is_naughty(1); # see plugins/naughty + $self->adjust_karma(-1); + + if ($self->{_args}{deny_viruses}) { + return DENY, "Virus found: $found"; + } + + $transaction->header->add('X-Virus-Found', 'Yes', 0); + $transaction->header->add('X-Virus-Details', $found, 0); + return DECLINED; + } + + $self->log(LOGINFO, "pass, clean"); + $transaction->header->add('X-Virus-Found', 'No', 0); + $transaction->header->add('X-Virus-Checked', + "by $version on " . $self->qp->config('me'), 0); + return DECLINED; +} + +sub assemble_message { + my ($self, $transaction) = @_; + $transaction->body_resetpos; + my $message = $transaction->header->as_string . "\n\n"; + while (my $line = $transaction->body_getline) { $message .= $line; } + $message = join(CRLF, split /\n/, $message); + return $message . CRLF; +} + +sub err_and_return { + my $self = shift; + my $message = shift; + if ($message) { + $self->log(LOGERROR, $message); + } + return DENYSOFT, "Unable to scan for viruses" + if $self->{_args}{defer_on_error}; + return DECLINED, "skip"; +} + +sub get_filename { + my $self = shift; + my $transaction = shift || $self->qp->transaction; + + my $filename = $transaction->body_filename; + + if (!$filename) { + $self->log(LOGWARN, "Cannot process due to lack of filename"); + return; + } + + if (!-f $filename) { + if ($transaction->data_size) { + $self->log(LOGERROR, "spool file missing! Attempting to respool"); + $transaction->body_spool; + $filename = $transaction->body_filename; + }; + if (!-f $filename) { + $self->log(LOGERROR, "skip: failed spool to $filename! Giving up"); + return; + } + my $size = (stat($filename))[7]; + $self->log(LOGDEBUG, "Spooled $size bytes to $filename"); + } + + return $filename; +} + +sub set_permission { + my ($self, $filename) = @_; + + # the spool directory must be readable and executable by the scanner; + # this generally means either group or world exec; if + # neither of these is set, issue a warning but try to proceed anyway + my $dir_mode = (stat($self->spool_dir()))[2]; + $self->log(LOGDEBUG, "spool dir mode: $dir_mode"); + + if ($dir_mode & oct('0010') || $dir_mode & oct('0001')) { + + # match the spool file mode with the mode of the directory -- add + # the read bit for group, world, or both, depending on what the + # spool dir had, and strip all other bits, especially the sticky bit + my $fmode = + ($dir_mode & oct('0044')) | ($dir_mode & oct('0010') ? oct('0040') : 0) | + ($dir_mode & oct('0001') ? oct('0004') : 0); + + unless (chmod $fmode, $filename) { + $self->log(LOGERROR, "chmod: $filename: $!"); + return; + } + return 1; + } + $self->log(LOGWARN, + "spool directory permissions do not permit scanner access"); + return 1; +} + +sub get_clamd { + my $self = shift; + + my $port = $self->{'_args'}{'clamd_port'}; + my $host = $self->{'_args'}{'clamd_host'} || 'localhost'; + + if ($port && $port =~ /^(\d+)/) { + return new Net::ClamAV::Client({url => "$host:$1"}); + } + + my $socket = $self->{'_args'}{'clamd_socket'}; + if ($socket) { + if ($socket =~ /([\w\/.]+)/) { + return new ClamAV::Client(socket_name => $1); + } + $self->log(LOGERROR, "invalid characters in socket name"); + } + + return new Net::ClamAV::Client; +} + +sub is_too_big { + my $self = shift; + my $transaction = shift || $self->qp->transaction; + + my $size = $transaction->data_size; + if ($size > $self->{_args}{max_size} * 1024) { + $self->log(LOGINFO, "skip, too big ($size)"); + return 1; + } + + $self->log(LOGDEBUG, "data_size, $size"); + return 0; +} + +sub is_multipart { + my $self = shift; + my $transaction = shift || $self->qp->transaction; + + return 0 if !$transaction->header; + + # Ignore non-multipart emails + my $content_type = $transaction->header->get('Content-Type') or return 0; + $content_type =~ s/\s/ /g; + if ($content_type !~ m!\bmultipart/.*\bboundary="?([^"]+)!i) { + $self->log(LOGNOTICE, "skip, not multipart"); + return 0; + } + + return 1; +} + +sub should_scan { + my $self = shift; + my $tran = shift; + return 0 if $self->is_too_big($tran); + return 1 if $self->{_args}{scan_all}; + return 0 if ! $self->is_multipart($tran); + return 1; +} diff --git a/federationhq_rcpt b/federationhq_rcpt new file mode 100644 index 0000000..d82919a --- /dev/null +++ b/federationhq_rcpt @@ -0,0 +1,94 @@ +use strict; +use warnings; + +use Qpsmtpd::Constants; +use Qpsmtpd::DSN; + +use DBI; + +sub register { + my ($self, $qp) = (shift, shift); + + # some default values + $self->{database} = $qp->config("fedhq_mysql_database") || "mail"; + $self->{host} = $qp->config("fedhq_mysql_host") || "localhost"; + $self->{port} = $qp->config("fedhq_mysql_port") || "3306"; + $self->{user} = $qp->config("fedhq_mysql_user") || "qpsmtpd"; + $self->{pass} = $qp->config("fedhq_mysql_password"); + + $self->createDSN(); + +} + + +sub createStatements +{ + my $self = shift; + + $self->{rcpt_sth} = $self->{dbh}->prepare("select username from email_address where alias=? and domain=?"); + + $self->{fetch_all_sth} = $self->{dbh}->prepare("select username from email_address where domain=? and isFetchAll=1"); +} + +sub connect +{ + my $self = shift; + + $self->{dbh} = DBI->connect($self->{dsn}, $self->{user}, $self->{pass}, { RaiseError => 0}) || + $self->log(LOGERROR, "error connecting to DB " . $DBI::errstr); + + if ($self->{dbh}->err()) + { + $self->log(LOGERROR, "error connecting to DB: " . $self->{dbh}->errstr()); + $self->{dbh}=undef; + } + +} + +sub createDSN +{ + my $self = shift; + my $dsn = "DBI:MariaDB:database=" . $self->{database} . ";host=" . $self->{host} . ";port=" . $self->{port}; + $self->{dsn} = $dsn; + + # try to parse the dsn to ensure it is valid + my @data = DBI->parse_dsn($self->{dsn}); + + if (@data == 0) + { + $self->log(LOGERROR, "DSN " . $self->{dsn} . " not valid"); + $self->{dsn}=""; + } + + $self->log(LOGDEBUG, "created DSN " . $self->{dsn}); +} + + +sub hook_rcpt { + my ($self, $transaction, $recipient) = @_; + + $self->log(LOGNOTICE, "Recipient: " . $recipient->user . "@" . $recipient->host); + + return DECLINED unless $recipient->host && $recipient->user; + + $self->connect(); + $self->createStatements(); + + my $result = $self->{rcpt_sth}->execute($recipient->user, $recipient->host); + + if ($self->{rcpt_sth}->rows > 0) + { + $self->log(LOGDEBUG, " found recipient in database"); + return OK; + } + + + $result = $self->{fetch_all_sth}->execute($recipient->host); + if ($self->{fetch_all_sth}->rows > 0) + { + $self->log(LOGDEBUG, " found fetchall for doamin in database"); + return OK; + } + + return DECLINED; +}