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#
# MailScanner - SMTP E-Mail Virus Scanner
# Copyright (C) 2002 Julian Field
#
# $Id: Unzip.pm 4287 2008-01-31 11:56:37Z sysjkf $
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# The author, Julian Field, can be contacted by email at
# Jules@JulianField.net
# or by paper mail at
# Julian Field
# Dept of Electronics & Computer Science
# University of Southampton
# Southampton
# SO17 1BJ
# United Kingdom
#
package MailScanner::Unzip;
use strict 'vars';
use strict 'refs';
no strict 'subs'; # Allow bare words for parameter %'s
use DirHandle;
use vars qw($VERSION);
### The package version, both in 1.23 style *and* usable by MakeMaker:
$VERSION = substr q$Revision: 4287 $, 10;
# Attributes are
#
# Constructor.
sub new {
my $type = shift;
my $this = {};
#$this->{dir} = shift;
bless $this, $type;
return $this;
}
sub UnpackZipMembers {
my($message, $attachdir) = @_;
my($file, $parent, $member, %memberlist, %membercount);
my($memberlist, $zipmember);
my $MaxMembersPerArchive = MailScanner::Config::Value('unzipmaxmembers',
$message);
return unless $MaxMembersPerArchive > 0;
my $MaxMemberSize = MailScanner::Config::Value('unzipmaxsize', $message);
return unless $MaxMemberSize > 0;
my $FilenameList = MailScanner::Config::Value('unzipmembers', $message);
return unless $FilenameList;
while (($file,$parent) = each %{$message->{file2parent}}) {
#print STDERR "Looking at zip member $file, parent $parent\n";
next if $parent =~ /(.winmail\d*\.dat\d*)/i; # Skip TNEF members
next if $parent eq ""; # Skip attachments
next if $message->{file2parent}{$parent}; # Skip nested files
next unless -f "$attachdir/$file"; # Skip files that don't exist
# Build a list of the number of members in each zip archive,
# as we have a maximum number for each zip archive.
#print STDERR "Zip member $file is an archive member\n";
$memberlist{$parent} .= "\0$file";
$membercount{$parent}++;
}
foreach $member (keys %membercount) {
if ($membercount{$member} > $MaxMembersPerArchive) {
#print STDERR "$member has too many children\n";
delete $memberlist{$member};
delete $membercount{$member};
}
}
# Turn the $FilenameList of filename patterns (including * wildcards)
# into a regexp of all the filename patterns we are looking for.
my $FilesWeWant = '.*';
my $ExtensionList = MailScanner::Config::Value('unzipmembers', $message);
if ($ExtensionList) {
my @regexps;
foreach (split(" ", $ExtensionList)) {
next unless $_;
s/[^0-9a-z_-]/\\$&/ig; # Quote every non-alnum
s/\\\*/.*/g; # Unquote any '*' characters as they map to .*
push @regexps, $_;
}
$FilesWeWant = join('|',@regexps);
}
# Loop through each member of each zip file to add them to the message
my($zipname, $memberlist, $unsafemember, $safemember);
while (($zipname,$memberlist) = each %memberlist) {
next unless $memberlist;
#print STDERR "Memberlist = $memberlist\n";
foreach $unsafemember (split(/\0+/, $memberlist)) {
#print STDERR "Looking at \"$unsafemember\" to add to the message?\n";
next if $unsafemember eq "";
next unless $unsafemember =~ /$FilesWeWant/i;
next unless -f "$attachdir/$unsafemember" &&
-s "$attachdir/$unsafemember" < $MaxMemberSize;
#print STDERR "Adding $unsafemember($zipname) to the message\n";
# Add $unsafemember to the message
$safemember = $message->{file2safefile}{substr($unsafemember,1)};
#print STDERR "Safe member name is $safemember\n";
next unless $safemember;
$message->{entity}->make_multipart;
# The only file that ever existed in message structure is the safename.
# Trim off the leading type indicator, as we're storing unsafe filename.
$message->{file2parent}{substr($unsafemember,1)} = $zipname;
$message->{entity}->attach(Type =>
MailScanner::Config::Value('unzipmimetype', $message),
Encoding => "Base64",
Disposition => "attachment",
Filename => substr($unsafemember,1),
Path => "$attachdir/$safemember");
$message->{bodymodified} = 1;
MailScanner::Log::InfoLog("Message %s added Archived file '%s/%s'" .
" to message as %s",
$message->{id},
$attachdir, substr($unsafemember, 1),
substr($safemember, 1));
}
}
}
1;
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