File: amavisd-release

package info (click to toggle)
amavisd-new 1:2.11.0-6.1
  • links: PTS, VCS
  • area: main
  • in suites: buster, sid
  • size: 12,432 kB
  • sloc: perl: 33,770; sh: 523; sql: 158; makefile: 8
file content (314 lines) | stat: -rwxr-xr-x 12,649 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
#!/usr/bin/perl -T

#------------------------------------------------------------------------------
# This is amavisd-release, an EXAMPLE quarantine release utility program.
# It uses AM.PDP protocol to send a request to amavisd daemon to release
# a quarantined mail message.
#
# Author: Mark Martinec <Mark.Martinec@ijs.si>
#
# Copyright (c) 2005-2014, Mark Martinec
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and documentation are
# those of the authors and should not be interpreted as representing official
# policies, either expressed or implied, of the Jozef Stefan Institute.

# (the above license is the 2-clause BSD license, also known as
#  a "Simplified BSD License", and pertains to this program only)
#
# Patches and problem reports are welcome.
# The latest version of this program is available at:
#   http://www.ijs.si/software/amavisd/
#------------------------------------------------------------------------------

# Usage:
#   amavisd-release mail_file secret_id [alt_recip1 alt_recip2 ..]
#
# To be placed in amavisd.conf:
#   $interface_policy{'SOCK'} = 'AM.PDP';
#   $policy_bank{'AM.PDP'} = { protocol=>'AM.PDP' };
#   $unix_socketname = '/var/amavis/amavisd.sock';
# or:
#   $interface_policy{'9998'} = 'AM.PDP';
#   $policy_bank{'AM.PDP'} = { protocol=>'AM.PDP' };
#   $inet_socket_port = [10024,9998];
#
# To obtain secret_id and quar_type belonging to some mail_id:
# $ mysql mail_log -e \
#   'select secret_id,quar_type,content from msgs where mail_id="W+7uJyXUjw32"'
#
# If secret_id is not available, administrator may choose to skip checking
# of secret_id in the amavisd daemon by setting a configuration variable
# $auth_required_release to false (it defaults to true). If the release
# client program specifies a nonempty secret_id in the request, the secret_id
# will be validated and a request will fail if not valid, regardless of the
# setting of $auth_required_release. Turning off a requirement for a valid
# secret_id widens the right to release to anyone who can connect to amavisd
# socket (Unix or inet). Access to the socket therefore needs to be restricted
# using socket protection (unix socket) or @inet_acl (for inet socket).


use warnings;
use warnings FATAL => 'utf8';
no  warnings 'uninitialized';
use strict;
use re 'taint';
use IO::Socket;
use Time::HiRes ();

use vars qw($VERSION);  $VERSION = 2.002;
use vars qw($log_level $socketname $have_inet4 $have_inet6 $have_socket_ip);

BEGIN {
### USER CONFIGURABLE:

  $log_level = 1;
# $socketname = '127.0.0.1:9998';
# $socketname = '[::1]:9998';
  $socketname = '/var/lib/amavis/amavisd.sock';

### END OF USER CONFIGURABLE
}

BEGIN {
  # no need to load INET/INET6 modules when a socket is a Unix socket
  return if $socketname =~ m{^/};

  # prefer using IO::Socket::IP if it exists, otherwise
  # fall back to IO::Socket::INET6 or IO::Socket::INET as appropriate
  #
  $have_socket_ip = eval {
    require IO::Socket::IP;
  };

  $have_inet4 =  # can we make a PF_INET socket?
    $have_socket_ip ? eval {
      my $sock = IO::Socket::IP->new(LocalAddr => '0.0.0.0', Proto => 'udp');
      $sock->close or die "error closing inet6 socket: $!"  if $sock;
      $sock ? 1 : undef;
    } : eval {
      require IO::Socket::INET;
      my $sock = IO::Socket::INET->new(LocalAddr => '0.0.0.0', Proto => 'udp');
      $sock->close or die "error closing inet socket: $!"  if $sock;
      $sock ? 1 : undef;
    };

  $have_inet6 =  # can we make a PF_INET6 socket?
    $have_socket_ip ? eval {
      my $sock = IO::Socket::IP->new(LocalAddr => '::', Proto => 'udp');
      $sock->close or die "error closing inet6 socket: $!"  if $sock;
      $sock ? 1 : undef;
    } : eval {
      require IO::Socket::INET6;
      my $sock = IO::Socket::INET6->new(LocalAddr => '::', Proto => 'udp');
      $sock->close or die "error closing inet6 socket: $!"  if $sock;
      $sock ? 1 : undef;
    };

  1;
} # end BEGIN

sub sanitize_str {
  my($str, $keep_eol) = @_;
  my(%map) = ("\r" => '\\r', "\n" => '\\n', "\f" => '\\f', "\t" => '\\t',
              "\b" => '\\b', "\e" => '\\e', "\\" => '\\\\');
  if ($keep_eol) {
    $str =~ s/([^\012\040-\133\135-\176])/  # and \240-\376 ?
              exists($map{$1}) ? $map{$1} :
                     sprintf(ord($1)>255 ? '\\x{%04x}' : '\\%03o', ord($1))/eg;
  } else {
    $str =~ s/([^\040-\133\135-\176])/      # and \240-\376 ?
              exists($map{$1}) ? $map{$1} :
                     sprintf(ord($1)>255 ? '\\x{%04x}' : '\\%03o', ord($1))/eg;
  }
  $str;
}

sub ll($) {
  my($level) = @_;
  $level <= $log_level;
}

sub do_log($$;@) {
  my($level, $errmsg, @args) = @_;
  if ($level <= $log_level) {
    $errmsg = sprintf($errmsg,@args)  if @args;
    print STDERR sanitize_str($errmsg)."\n";  # ignoring I/O status
  }
}

sub proto_decode($) {
  my($str) = @_;
  $str =~ s/%([0-9a-fA-F]{2})/pack("C",hex($1))/eg;
  $str;
}

sub proto_encode($@) {
  my($attribute_name,@strings) = @_; local($1);
  $attribute_name =~    # encode all but alfanumerics, '_' and '-'
    s/([^0-9a-zA-Z_-])/sprintf("%%%02x",ord($1))/eg;
  for (@strings) {      # encode % and nonprintables
    s/([^\041-\044\046-\176])/sprintf("%%%02x",ord($1))/eg;
  }
  $attribute_name . '=' . join(' ',@strings);
}

sub ask_amavisd($$) {
  my($sock,$query_ref) = @_;
  my(@encoded_query) =
    map { /^([^=]+)=(.*)\z/s; proto_encode($1,$2) } @$query_ref;
  do_log(2,'> '.$_)  for @encoded_query;
  $sock->print( map { $_."\015\012" } (@encoded_query,'') )
    or die "Can't write response to socket: $!";
  $sock->flush or die "Can't flush on socket: $!";
  my(%attr); local($1,$2,$3);
  local($/) = "\015\012";    # set line terminator to CRLF
  # must not use \r and \n, which may not be \015 and \012 on certain platforms
  do_log(2,"waiting for response");
  while(<$sock>) {
    last  if /^\015\012\z/;  # end of response
    if (/^ ([^=\000\012]*?) (=|:[ \t]*) ([^\012]*?) \015\012 \z/xsi) {
      my $attr_name = proto_decode($1);
      my $attr_val  = proto_decode($3);
      if (!exists $attr{$attr_name}) { $attr{$attr_name} = [] }
      push(@{$attr{$attr_name}}, $attr_val);
    }
  }
  if (!defined($_) && $! != 0) { die "read from socket failed: $!" }
  \%attr;
}

sub release_file($$$@) {
  my($sock,$mail_file,$secret_id,@alt_recips) = @_;
  my($fn_path,$fn_prefix,$mail_id,$fn_suffix,$part_tag); local($1,$2,$3,$4);
  $part_tag = $1  if $mail_file =~ s/ \[ ( [^\]]* ) \] \z//xs;
  if ($mail_file =~ m{^ ([^/].*/)? ([A-Z0-9][A-Z0-9._-]*[_-])?
                        ([A-Z0-9][A-Z0-9_+-]{10,14}[A-Z0-9]) (\.gz)? \z}xsi) {
    ($fn_path,$fn_prefix,$mail_id,$fn_suffix) = ($1,$2,$3,$4);
  } elsif ($mail_file =~ m{^ ([^/].*/)? () ([A-Za-z0-9$._=+-]+?) (\.gz)?\z}xs){
    ($fn_path,$fn_prefix,$mail_id,$fn_suffix) = ($1,$2,$3,$4);  # old style
  } else {
    usage("Invalid quarantine ID: $mail_file");
  }
  my $quar_type = $fn_suffix eq '.gz' ? 'Z' : $fn_path ne '' ? 'F' : '';
  my $request_type = $0 =~ /\breport\z/i  ? 'report'
                   : $0 =~ /\brequeue\z/i ? 'requeue' : 'release';
  my(@query);
  push(@query, "request=$request_type");
  push(@query, "mail_id=$mail_id");
  push(@query, "quar_type=$quar_type")  if $quar_type ne '';
  push(@query, "secret_id=$secret_id")  if $secret_id ne '';
  push(@query, "mail_file=$mail_file");  # ignored with an SQL quarantine
  push(@query, "partition_tag=$part_tag") if $part_tag ne '';
  if (@alt_recips) {  # override original recipients if list is nonempty
    push(@query, map {"recipient=$_"} @alt_recips);
  }
  my $attr_ref = ask_amavisd($sock,\@query);
  $attr_ref && %$attr_ref  or die "Invalid response received";
  if (ll(2)) {
    for my $attr_name (keys %$attr_ref) {
      for my $attr_val (@{$attr_ref->{$attr_name}}) {
        do_log(2,"< %s=%s", $attr_name,$attr_val);
      }
    }
  }
  do_log(0,$_)  for (@{$attr_ref->{'setreply'}});
  # may do another release request on the same session if needed ...
}

sub usage(;$) {
  my($msg) = @_;
  print STDERR $msg,"\n\n"  if $msg ne '';
  my $prog = $0;  $prog =~ s{^.*/(?=[^/]+\z)}{};
  print STDERR "$prog version $VERSION\n";
  die "Usage:  \$ $prog mail_file [secret_id [alt_recip1 alt_recip2 ...]]\n".
      "  or to read request lines from stdin:  \$ $prog -\n";
}

# Main program starts here

  my($sock,$mail_file,$secret_id);
  @ARGV >= 1 or usage("Not enough arguments");
  $mail_file = shift(@ARGV);   # quarantine file id or '-'
  if ($mail_file eq '-') { @ARGV==0 or usage("Extra arguments after '-'") }

  my($peeraddress, $peerport, $is_inet); local($1,$2,$3);
  if ($socketname =~ m{^/}) {  # simpleminded: unix vs. inet
    $is_inet = 0;
  } elsif ($socketname =~ /^(?: \[ ([^\]]*) \] | ([^:]*) ) : ([^:]*)/sx) {
    $peeraddress = defined $1 ? $1 : $2;  $peerport = $3;  $is_inet = 1;
  } elsif ($socketname =~ /^(?: \[ ([^\]]*) \] | ([0-9a-fA-F.:]+) ) \z/sx) {
    $peeraddress = defined $1 ? $1 : $2;  $is_inet = 1;
  } else {  # probably a syntax error, but let's assume it is a Unix socket
    $is_inet = 0;
  }
  if (!$is_inet) {  # unix socket
    do_log(3,"connecting to a UNIX socket %s", $socketname);
    $sock = IO::Socket::UNIX->new(Type => SOCK_STREAM);
    $sock or die "Can't create UNIX socket: $!";
    $sock->connect( pack_sockaddr_un($socketname) )
      or die "Can't connect to UNIX socket $socketname: $!";
  } else {  # inet socket
    $peerport or die "port number not specified in \$socketname: $socketname\n";
    my $module = $have_socket_ip ? 'IO::Socket::IP'
               : $have_inet4 && (!$have_inet6 ||
                   $peeraddress=~/^\d+\.\d+\.\d+\.\d+\z/) ? 'IO::Socket::INET'
               : 'IO::Socket::INET6';
    my(%args) = (Type => SOCK_STREAM, Proto => 'tcp',
                 PeerAddr => $peeraddress, PeerPort => $peerport);
    do_log(3,"connecting using %s to [%s]:%s",
              $module, $peeraddress, $peerport);
    if ($have_socket_ip) {  # $module eq 'IO::Socket::IP'
      # inet or inet6 socket, let IO::Socket::IP handle dirty details
      $sock = IO::Socket::IP->new(%args);
      # note: the IO::Socket::IP constructor provides error message in $@
      $sock or die "Can't connect to socket $socketname using $module: $@\n";
    } elsif ($module eq 'IO::Socket::INET') {  # inet socket (IPv4)
      $sock = IO::Socket::INET->new(%args);
      $sock or die "Can't connect to socket $socketname using $module: $!\n";
    } else {  # inet6 socket: no inet or IPv6 or unknown addr family
      $sock = IO::Socket::INET6->new(%args);
      $sock or die "Can't connect to socket $socketname using $module: $!\n";
    }
  }

  if ($mail_file eq '-') {
    undef $!;
    while (<>) {  # read from STDIN: mail_file [secret_id [alt_recips...]]
      chomp;
      next  if /^[ \t]*(#.*)?$/;  # skip empty lines or comments
      my($mail_file, $secret_id, @alt_recips) = split(' ');
      release_file($sock,$mail_file,$secret_id,@alt_recips);
    }
    $!==0 or die "Error reading from STDIN: $!";
  } else {
    # assume empty secret_id if the second arg looks like an e-mail addr
    $secret_id = $ARGV[0]=~/\@/ ? '' : shift(@ARGV);
    release_file($sock,$mail_file,$secret_id,@ARGV);
  }
  $sock->close  or die "Error closing socket: $!";
  close(STDIN)  or die "Error closing STDIN: $!";
  close(STDOUT) or die "Error closing STDOUT: $!";
  close(STDERR) or die "Error closing STDERR: $!";