This file is indexed.

/usr/lib/news/bin/controlchan is in inn2 2.6.1-2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  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
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
#! /usr/bin/perl -w
use lib '/usr/share/perl5'; use INN::Config;

##  $Id: controlchan.in 10076 2016-10-08 20:37:36Z iulius $
##
##  Channel feed program to route control messages to an appropriate handler.
##
##  Copyright 2001 by Marco d'Itri <md@linux.it>
##
##  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.
##
##  Give this program its own newsfeed.  Make sure that you've created
##  the newsgroup control.cancel so that you don't have to scan through
##  cancels, which this program won't process anyway.
##
##  Make a newsfeeds entry like this:
##
##  controlchan!\
##     :!*,control,control.*,!control.cancel\
##     :AC,Tc,Wnsm\
##     :<pathbin>/controlchan

require 5.004_03;
use Encode;
use Getopt::Std;
use MIME::Parser;
use INN::Utils::Shlock;
use strict;

delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};
$0 =~ s!.*/!!;

# globals
my ($cachedctl, $curmsgid);
my $lastctl = 0;
my $use_syslog = 0;
my $debug = 0;

END {
    # In case we bail out, while holding a lock.
    INN::Utils::Shlock::releaselocks();
}


my $usage = "usage: $0 [-ch]\n\n" .
    "Reads stdin for file names or tokens.\n\n" .
    "  -c   Disables cutoff on dates.\n" .
    "  -h   Giveis this usage information.\n";

my %opt;
getopts("ch", \%opt) || die $usage;

die $usage if defined $opt{'h'};

# setup logging ###########################################################
# do not log to syslog if stderr is connected to a console
if (not -t 2) {
    eval { require INN::Syslog; import INN::Syslog; $use_syslog = 1; };
    eval { require Sys::Syslog; import Sys::Syslog; $use_syslog = 1; }
        unless $use_syslog;
}

if ($use_syslog) {
    if ($Sys::Syslog::VERSION lt 0.15) {
        eval "sub Sys::Syslog::_PATH_LOG { '/dev/log' }" if $^O eq 'dec_osf';
        Sys::Syslog::setlogsock('unix') if $^O =~ /linux|dec_osf|freebsd|darwin/;
    }
    openlog('controlchan', 'pid', $INN::Config::syslog_facility);
}
logmsg('starting');

# load modules from the control directory #################################
opendir(CTL, $INN::Config::controlprogs)
    or logdie("Cannot open $INN::Config::controlprogs: $!", 'crit');
foreach (readdir CTL) {
    next if not /^([a-z\.]+\.pl)$/ or not -f "$INN::Config::controlprogs/$_";
    eval { require "$INN::Config::controlprogs/$1" };
    if ($@) {
        $@ =~ s/\n/  /g;
        logdie($@, 'crit');
    }
    logmsg("loaded $INN::Config::controlprogs/$1", 'debug');
}
closedir CTL;

# main loop ###############################################################
while (<STDIN>) {
    chop;
    my ($token, $sitepath, $msgid) = split(/\s+/, $_);
    next if not defined $token;
    $sitepath ||= '';
    $curmsgid = $msgid || '';

    my $artfh = open_article($token);
    next if not defined $artfh;

    my $article_string = '';
    while (<$artfh>) {
        $article_string .= $_;
    }

    close $artfh or logdie('sm died with status ' . ($? >> 8));

    my %hdr;
    my $parser = new MIME::Parser;
    $parser->output_dir("$INN::Config::pathtmp");
    my $article = $parser->parse_data($article_string);

    if (not parse_article($article, \%hdr)) {
        $parser->filer->purge;
        next;
    }

    if (not $hdr{'control'}) {
        $parser->filer->purge;
        next;
    }

    if (not defined $opt{'c'}) {
        # Make sure old control articles are not replayed.
        my ($postingdate, $injectiondate);

        # Parse date header fields.  We will take the oldest date.
        if ($hdr{'date'}) {
            $postingdate = int(convdate('-n', "$hdr{'date'}"));
        } else {
            logmsg('Missing Date: header field');
            $parser->filer->purge;
            next;
        }
        if ($hdr{'injection-date'}) {
            $injectiondate = int(convdate('-n', "$hdr{'injection-date'}"));
        } else {
            $injectiondate = $postingdate;
        }

        my $articledate = ($postingdate < $injectiondate) ? $postingdate : $injectiondate;

        # Compute the allowed interval of time:
        # artcutoff days in the past, one day in the future.
        my $currentdate = int(convdate('-n'));
        my $mindate = $currentdate - $INN::Config::artcutoff * 86400;
        my $maxdate = $currentdate + 86400;

        if ($articledate > $maxdate) {
            logmsg('Control article injected or posted in the future ('
                   . convdate('-d', '-c', "$articledate") . ')');
            $parser->filer->purge;
            next;
        }

        if ($INN::Config::artcutoff > 0 && $articledate < $mindate) {
            logmsg('Control article too old ('
                   . convdate('-d', '-c', "$articledate")
                   . '), artcutoff set to ' . $INN::Config::artcutoff . ' days');
            $parser->filer->purge;
            next;
        }
    }

    $curmsgid = $hdr{'message-id'};
    my $sender = cleanaddr($hdr{'sender'} || $hdr{'from'});
    my $replyto = cleanaddr($hdr{'reply-to'} || $hdr{'from'});

    my (@progparams, $progname);
    if ($hdr{'control'} =~ /\s/) {
        $hdr{'control'} =~ /^(\S+)\s+(.+)?/;
        $progname = lc $1;
        # Newsgroups names are case-sensitive.
        @progparams = split(/\s+/, $2) if $2;
        if ($progname eq 'newgroup' and defined $progparams[1]) {
            $progparams[1] = lc $progparams[1];
        }
    } else {
        $progname = lc $hdr{'control'};
    }

    if ($progname eq 'cancel') {
        $parser->filer->purge;
        next;
    }

    if ($progname !~ /^([a-z]+)$/) {
        logmsg("Naughty control in article $curmsgid ($progname)");
        $parser->filer->purge;
        next;
    }
    $progname = $1;

    # Do we want to process the message?  Let's check the permissions.
    my (@charset_from, @maxchanges, @matches);
    my $exclusionpats = '';
    my $droppats = '';
    my $charset_to = ctlperm($progname, $sender, $progparams[0],
                             $token, $article, \@charset_from,
                             \@maxchanges, \@matches);

    foreach my $i (0..$#matches) {
        my $action = $matches[$i][0] if $matches[$i][0];
        my $logname = $matches[$i][1] if $matches[$i][1];
        $progparams[0] = $matches[$i][2] if $matches[$i][2];

        if ($action eq '_pgpfail') {
            my $type = '';
            if ($progname and $progname eq 'newgroup') {
                if ($progparams[1] and $progparams[1] eq 'moderated') {
                    $type = 'm ';
                } else {
                    $type = 'y ';
                }
            }
            logmsg("skipping $progname $type$sender"
                . " (pgpverify failed) in $curmsgid");
            next;
        }

        # Find the appropriate module and call it.
        my $subname = "control_$progname";
        my $subfind = \&$subname;
        if (not defined &$subfind) {
            if ($logname) {
                logger($logname, "Unknown control message by $sender",
                    $article);
            } else {
                logmsg("Unknown \"$progname\" control by $sender");
            }
            next;
        }

        # Count a control article only once.
        my $approved = $hdr{'approved'} ? 1 : 0;
        $approved = -1 if $i > 0;
        logmsg("$subname, " . join(' ', @progparams)
            . " $sender $replyto $token, $exclusionpats, $droppats,"
            . " $charset_to, $sitepath, $action"
            . ($logname ? "=$logname" : '') .", $approved");

        if ($action ne 'drop') {
            &$subfind(\@progparams, $sender, $replyto,
                $sitepath, $action, $logname, $approved, $article,
                \@charset_from, $charset_to, $exclusionpats, $droppats,
                \@maxchanges);

            $exclusionpats .= '|' if $exclusionpats;
            $exclusionpats .= $progparams[0];
        } else {
            $droppats .= '|' if $droppats;
            $droppats .= $progparams[0];
        }
    }

    $parser->filer->purge;
}

closelog() if $use_syslog;
exit 0;

# misc functions ##########################################################
sub parse_article {
    my ($article, $hdr) = @_;
    my ($h, $buffer);
    my %uniquehdr = map { $_ => 1 } qw(approved control date followup-to
        from injection-date message-id newsgroups path reply-to sender subject);

    my $head = $article->head;

    foreach $h (%uniquehdr) {
        $hdr->{$h} = '';
        $buffer = $head->get($h);
        if ($buffer) {
            $buffer =~ s/\r?\n$//;
            $buffer =~ s/\r?\n\s+/ /g;
            $hdr->{$h} = $buffer;
        }
        if ($head->count($h) > 1) {
            logmsg("Multiple $h headers in article $curmsgid");
            return 0;
        }
    }

    # Article is empty or does not exist.
    return 0 if not $head->stringify;

    return 1;
}

# Strip a mail address, innd-style.
sub cleanaddr {
    local $_ = shift;
    s/(\s+)?\(.*\)(\s+)?//g;
    s/.*<(.*)>.*/$1/;
    s/[^-a-zA-Z0-9+_.@%]/_/g;    # protect MTA
    s/^-/_/;                     # protect MTA
    return $_;
}

# Read and cache control.ctl and control.ctl.local.
sub readctlfile {
    if (! -e $INN::Config::ctlfile) {
        logdie("Cannot open $INN::Config::ctlfile: $!", 'crit');
    }
    my $localfile = (-e $INN::Config::ctlfile . '.local');

    my @files = ($INN::Config::ctlfile);
    my $mtime = (stat($INN::Config::ctlfile))[9];

    if ($localfile) {
        push(@files, $INN::Config::ctlfile . '.local');
        my $mtimelocalfile = (stat($INN::Config::ctlfile . '.local'))[9];
        if ($mtimelocalfile > $mtime) {
            $mtime = $mtimelocalfile;
        }
    }

    return $cachedctl if $lastctl == $mtime;    # mtime has not changed.
    $lastctl = $mtime;

    my @ctllist;
    foreach my $file (@files) {
        open(CTLFILE, $file)
            or logdie("Cannot open $file: $!", 'crit');
        while (<CTLFILE>) {
            chop;
            # Not a comment or blank?  Convert wildmat to regex.
            next if not /^(\s+)?[^\#]/ or /^$/;

            if (not /^\/(?:local)?encoding\/:/ and
                not /^\/maxdocheckgroups\/:/ and
                not /:(?:doit|doifarg|drop|log|mail|verify-.*)(?:=.*)?$/) {
                s/.*://;
                logmsg("$_ is not a valid action for control.ctl", 'err');
                next;
            }

            # Convert to a ':'-separated list of regexps.
            s/^all:/*:/i;
            s/([\$\+\.])/\\$1/g;
            s/\*/.*/g;
            s/\?/./g;
            s/(.*)/^$1\$/;
            s/:/\$:^/g;
            s/\|/\$|^/g;
            s/\//\\\//g;

            push(@ctllist, $_);
        }
        close(CTLFILE);
    }

    logmsg('warning: control.ctl is empty!', 'err') if not @ctllist;
    return $cachedctl = [ reverse @ctllist ];
}

# Parse a control message's permissions.
sub ctlperm {
    my ($type, $sender, $newsgroup, $token, $article, $charset_from,
        $maxchanges, $matches) = @_;

    my %keyresults = ();
    my ($action, $maxdocheckgroups, $logname, $charset_to);

    # newgroup and rmgroup require newsgroup names; check explicitly for that
    # here and return drop if the newsgroup is missing (to avoid a bunch of
    # warnings from undefined values later on in permission checking).
    if ($type eq 'newgroup' or $type eq 'rmgroup') {
        unless ($newsgroup) {
            push (@$matches, [ 'drop', undef, undef ]);
            return ('UTF-8');
        }
    }

    my $ctllist = readctlfile();
    my $matchedaction = 0;
    my $matchedencoding = 0;
    foreach (@$ctllist) {
        my @ctlline = split /:/;
        # 0: type  1: from@addr  2: group.*  3: action
        if ($type =~ /$ctlline[0]/ and $sender =~ /$ctlline[1]/i and
            ($type !~ /(?:new|rm)group/ or $newsgroup =~ /$ctlline[2]/)) {
            if (not $matchedaction) {
                $action = $ctlline[3];
                $action =~ s/\^(.+)\$/$1/;
                $action =~ s/\\//g;
                ($action, $logname) = split(/=/, $action);
                if ($type eq 'checkgroups') {
                    push (@$matches, [ $action, $logname, $ctlline[2] ]);
                } else {
                    push (@$matches, [ $action, $logname, undef ]);
                    # @ctllist is a reversed list so the first match is the last
                    # one in control.ctl followed by control.ctl.local.
                    $matchedaction = 1;
                }
            }
        }
        # 0: /localencoding/  1: encoding
        if ($ctlline[0] eq '^\/localencoding\/$') {
            if (not $matchedencoding) {
                $charset_to = $ctlline[1];
                $charset_to =~ s/\^(.+)\$/$1/;
                $charset_to =~ s/\\//g;
                $matchedencoding = 1;
            }
        }
        # 0: /encoding/  1: from@addr  2: group.*  3: encoding[=force]
        if ($ctlline[0] eq '^\/encoding\/$') {
            if ($sender =~ /$ctlline[1]/i) {
                push (@$charset_from, $ctlline[2].':'.$ctlline[3]);
            }
        }
        # 0: /maxdocheckgroups/  1: from@addr  2: group.*  3: number
        if ($ctlline[0] eq '^\/maxdocheckgroups\/$') {
            if ($sender =~ /$ctlline[1]/i) {
                $maxdocheckgroups = $ctlline[3];
                $maxdocheckgroups =~ s/\^(.+)\$/$1/;
                push (@$maxchanges, $ctlline[2].':'.$maxdocheckgroups);
            }
        }
    }

    if (not defined $charset_to
        or not defined Encode::find_encoding($charset_to)) {
        $charset_to = 'UTF-8';  # Default local encoding.
    }

    # Default value when nothing matches the control article.
    if ($#$matches < 0) {
        push (@$matches, [ 'drop', undef, undef ]);
    }

    # Default value appended to the end of @maxchanges.
    push (@$maxchanges, '^.*$:10');

    foreach my $i (0..$#$matches) {
        if ($$matches[$i][0] =~ /^verify-(.+)/) {
            my $keyowner = $1;

            if (!exists($keyresults{$keyowner})) {
                if ($INN::Config::pgpverify and $INN::Config::pgpverify =~ /^(?:true|on|yes)$/i) {
                    my $pgpresult = defined &local_pgpverify ?
                        local_pgpverify($token, $article, $keyowner) : pgpverify($token, $keyowner);
                    if ($keyowner eq $pgpresult) {
                        $keyresults{$keyowner} = 'doit';
                    } else {
                        $keyresults{$keyowner} = '_pgpfail';
                    }
                } else {
                    $keyresults{$keyowner} = 'mail';
                }
           }
           $$matches[$i][0] = $keyresults{$keyowner};
        }
    }

    return ($charset_to);
}

# Write stuff to a log or send mail to the news admin.
sub logger {
    my ($logfile, $message, $article) = @_;
    my (@headers, @body);

    if (ref $article eq 'ARRAY') {
        @headers = @$article;
    } else {
        my $head = $article->head;
        @headers = split(/\r?\n/, $head->stringify);
        @body = split(/\r?\n/, $article->stringify_body);
    }

    if ($logfile eq 'mail') {
        my $mail = sendmail($message);
        print $mail map { s/^~/~~/; "$_\n" } @headers;
        print $mail "\n" . join ('', map { s/^~/~~/; "$_\n" } @body)
            if @body;
        close $mail or logdie("Cannot send mail: $!");
        return;
    }

    if ($logfile =~ /^([^.\/].*)/) {
        $logfile = $1;
    } else {
        logmsg("Invalid log file: $logfile", 'err');
        $logfile = 'control';
    }

    $logfile = "$INN::Config::most_logs/$logfile.log" unless $logfile =~ /^\//;
    my $lockfile = $logfile;
    $lockfile =~ s#.*/##;
    $lockfile = "$INN::Config::locks/LOCK.$lockfile";
    # Acquire a lock.
    INN::Utils::Shlock::lock($lockfile, 60) or logdie("Cannot create lockfile $lockfile");

    open(LOGFILE, ">>$logfile") or logdie("Cannot open $logfile: $!");
    print LOGFILE "$message\n";
    foreach (@headers, '', @body, '') {
        print LOGFILE "    $_\n";
    }
    close LOGFILE;
    
    # Unlock.
    INN::Utils::Shlock::unlock($lockfile);
}

# write to syslog or errlog
sub logmsg {
    my ($msg, $lvl) = @_;

    return if $lvl and $lvl eq 'debug' and not $debug;
    if ($use_syslog) {
        syslog($lvl || 'notice', '%s', $msg);
    } else {
        print STDERR (scalar localtime) . ": $msg\n";
    }
}

# log a message and then die
sub logdie {
    my ($msg, $lvl) = @_;

    $msg .= " ($curmsgid)" if $curmsgid;
    logmsg($msg, $lvl || 'err');
    exit 1;
}

# wrappers executing external programs ####################################

# Open an article appropriately to our storage method (or lack thereof).
sub open_article {
    my $token = shift;

    if ($token =~ /^\@.+\@$/) {
        my $pid = open(ART, '-|');
        logdie('Cannot fork: ' . $!) if $pid < 0;
        if ($pid == 0) {
            exec("$INN::Config::newsbin/sm", '-q', $token) or
                logdie("Cannot exec sm: $!");
        }
        return *ART;
    } else {
        return *ART if open(ART, $token);
        logmsg("Cannot open article $token: $!");
    }
    return undef;
}

sub pgpverify {
    my $token = shift;
    my $keyid = shift;

    if ($token =~ /^\@.+\@$/) {
        open(PGPCHECK, "$INN::Config::newsbin/sm -q $token "
            . "| $INN::Config::newsbin/pgpverify --findid='$keyid' |") or goto ERROR;
    } else {
        open(PGPCHECK, "$INN::Config::newsbin/pgpverify --findid='$keyid' < $token |") or goto ERROR;
    }
    my $pgpresult = <PGPCHECK>;
    close PGPCHECK or goto ERROR;
    $pgpresult ||= '';
    chop $pgpresult;
    return $pgpresult;
ERROR:
    logmsg("pgpverify failed: $!", 'debug');
    return '';
}

sub ctlinnd {
    my ($cmd, @args) = @_;

    my $st = system("$INN::Config::newsbin/ctlinnd", '-s', $cmd, @args);
    logdie('Cannot run ctlinnd: ' . $!) if $st == -1;
    logdie('ctlinnd returned status ' . ($st & 255)) if $st > 0;
}

# Run convdate on the given arguments.
# The result can be numeric (with -n) or a string (with -d).
sub convdate {
    my (@args) = @_;
    my $result = 0;

    my $pid = open(my $CONVDATE, '-|');
    logdie("Cannot fork:  $!") if $pid < 0;
    if ($pid == 0) {
        # exec() properly escapes its arguments to prevent shell injection.
        exec("$INN::Config::pathbin/convdate", @args) or
             logdie("Cannot exec convdate:  $!");
    } else {
        $result = <$CONVDATE>;
        close($CONVDATE);
    }

    $result = 0 if not $result;
    chomp $result;
    return $result;
}

# If $body is not defined, returns a file handle which must be closed.
# Don't forget checking the return value of close().
# $addresses may be a scalar or a reference to a list of addresses.
# If not defined, $INN::Config::newsmaster is the default.
# parts of this code stolen from innmail.pl
sub sendmail {
    my ($subject, $addresses, $body) = @_;
    $addresses = [ $addresses || $INN::Config::newsmaster ] if not ref $addresses;
    $subject ||= '(no subject)';

    # fix up all addresses
    my @addrs = map { s#[^-a-zA-Z0-9+_.@%]##g; $_ } @$addresses;

    my $sm = $INN::Config::mta;
    if ($sm =~ /%s/) {
        $sm = sprintf($sm, join(' ', @addrs));
    } else {
        $sm .= ' ' . join(' ', @addrs);
    }

    # fork and spawn the MTA without using the shell
    my $pid = open(MTA, '|-');
    logdie('Cannot fork: ' . $!) if $pid < 0;
    if ($pid == 0) {
        exec(split(/\s+/, $sm)) or logdie("Cannot exec $sm: $!");
    }

    print MTA 'To: ' . join(",\n\t", @addrs) . "\nSubject: $subject\n\n";
    return *MTA if not defined $body;
    $body = join("\n", @$body) if ref $body eq 'ARRAY';
    print MTA $body . "\n";
    close MTA or logdie("Execution of $sm failed: $!");
    return 1;
}