This file is indexed.

/usr/bin/dscverify is in devscripts 2.14.1.

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
#!/usr/bin/perl -w

# This program takes .changes or .dsc files as arguments and verifies
# that they're properly signed by a Debian developer, and that the local
# copies of the files mentioned in them match the MD5 sums given.

# Copyright 1998 Roderick Schertler <roderick@argon.org>
# Modifications copyright 1999,2000,2002 Julian Gilbey <jdg@debian.org>
# Drastically simplified to match katie's signature checking Feb 2002
#
# 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, see <http://www.gnu.org/licenses/>.

use 5.004;	# correct pipe close behavior
use strict;
use Cwd;
use Fcntl;
use Dpkg::IPC;
use File::Spec;
use File::Temp;
use File::Basename;
use POSIX	qw(:errno_h);
use Getopt::Long qw(:config gnu_getopt);

BEGIN {
    eval { require Digest::MD5; };
    if ($@) {
	my $progname = basename $0;
	if ($@ =~ /^Can\'t locate Digest\/MD5\.pm/) {
	    die "$progname: you must have the libdigest-md5-perl package installed\nto use this script\n";
	}
	die "$progname: problem loading the Digest::MD5 module:\n  $@\nHave you installed the libdigest-md5-perl package?\n";
    }
}

my $progname = basename $0;
my $modified_conf_msg;
my $Exit = 0;
my $start_dir = cwd;
my $verify_sigs = 1;
my $use_default_keyrings = 1;
my $verbose = 0;

sub usage {
    print <<"EOF";
Usage: $progname [options] dsc-or-changes-file ...
  Options: --help      Display this message
           --version   Display version and copyright information
           --keyring <keyring>
                       Add <keyring> to the list of keyrings used
           --no-default-keyrings
                       Do not check against the default keyrings
           --nosigcheck, --no-sig-check, -u
                       Do not verify the GPG signature
           --no-conf, --noconf
                       Do not read the devscripts config file
           --verbose
	               Do not suppress GPG output.


Default settings modified by devscripts configuration files:
$modified_conf_msg
EOF
}

my $version = <<"EOF";
This is $progname, from the Debian devscripts package, version 2.14.1
This code is copyright 1998 Roderick Schertler <roderick\@argon.org>
Modifications are copyright 1999, 2000, 2002 Julian Gilbey <jdg\@debian.org>
This program comes with ABSOLUTELY NO WARRANTY.
You are free to redistribute this code under the terms of the
GNU General Public License, version 2 or later.
EOF

sub xwarndie_mess {
    my @mess = ("$progname: ", @_);
    $mess[$#mess] =~ s/:$/: $!\n/;	# XXX loses if it's really /:\n/
    return @mess;
}

sub xwarn {
    warn xwarndie_mess @_;
    $Exit ||= 1;
}

sub xdie {
    die xwarndie_mess @_;
}

sub get_rings {
    my @rings = @_;
    my @keyrings = qw(/usr/share/keyrings/debian-keyring.gpg
	    /usr/share/keyrings/debian-maintainers.gpg);
    if (defined $ENV{HOME} && -r "$ENV{HOME}/.gnupg/trustedkeys.gpg") {
	unshift(@keyrings, "$ENV{HOME}/.gnupg/trustedkeys.gpg");
    }
    unshift(@keyrings, '/org/keyring.debian.org/keyrings/debian-keyring.gpg');
    if (system('dpkg-vendor', '--derives-from', 'Ubuntu') == 0) {
        unshift(@keyrings, qw(/usr/share/keyrings/ubuntu-master-keyring.gpg
			      /usr/share/keyrings/ubuntu-archive-keyring.gpg));
    }
    for (@keyrings) {
	push @rings, $_ if -r;
    }
    return @rings if @rings;
    xdie "can't find any system keyrings\n";
}

sub check_signature($\@;\$) {
    my ($file, $rings, $outref) = @_;

    my $fh = eval { File::Temp->new() }
	or xdie "unable to open status file for gpg: $@\n";

    # Allow the status file descriptor to pass on to the child process
    my $flags = fcntl($fh, F_GETFD, 0);
    fcntl($fh, F_SETFD, $flags & ~FD_CLOEXEC);

    my $fd = fileno $fh;
    my @cmd;
    push @cmd, qw(gpg --status-fd), $fd,
	       qw(--batch --no-options --no-default-keyring --always-trust);
    foreach (@$rings) { push @cmd, '--keyring'; push @cmd, $_; }

    my ($out, $err) = ('', '');
    eval {
	spawn(exec => \@cmd,
	    from_file => $file,
	    to_string => \$out,
	    error_to_string => \$err,
	    wait_child => 1);
    };

    if ($@) {
	print $out if ($verbose);
	return $err || $@;
    }

    seek($fh, 0, SEEK_SET);
    my $status;
    $status .= $_ while <$fh>;
    close $fh;

    if ($status !~ m/^\[GNUPG:\] VALIDSIG/m) {
	return $out;
    }

    if (defined $outref) {
	$$outref = $out;
    }

    return '';
}

sub process_file {
    my ($file, @rings) = @_;
    my ($filedir, $filebase);
    my $sigcheck;

    print "$file:\n";

    # Move to the directory in which the file appears to live
    chdir $start_dir or xdie "can't chdir to original directory!\n";
    if ($file =~ m-(.*)/([^/]+)-) {
	$filedir = $1;
	$filebase = $2;
	unless (chdir $filedir) {
	    xwarn "can't chdir $filedir:";
	    return;
	}
    } else {
	$filebase = $file;
    }

    my $out;
    if ($verify_sigs) {
	$sigcheck = check_signature $filebase, @rings, $out;
	if ($sigcheck) {
	    xwarn "$file failed signature check:\n$sigcheck";
	    return;
	} else {
	    print "      Good signature found\n";
	}
    }
    else {
	if (!open SIGNED, '<', $filebase) {
	    xwarn "can't open $file:";
	    return;
	}
	$out = do { local $/; <SIGNED> };
	if (!close SIGNED) {
	    xwarn "problem reading $file:";
	    return;
	}
    }

    if ($file =~ /\.changes$/ and $out =~ /^Format:\s*(.*)$/mi) {
	my $format = $1;
	unless ($format =~ /^(\d+)\.(\d+)$/) {
	    xwarn "$file has an unrecognised format: $format\n";
	    return;
	}
	my ($major, $minor) = split /\./, $format;
	$major += 0;
	$minor += 0;
	unless ($major == 1 and $minor <= 8) {
	    xwarn "$file is an unsupported format: $format\n";
	    return;
	}
    }

    my @spec = map { split /\n/ } $out =~ /^Files:\s*\n((?:[ \t]+.*\n)+)/mgi;
    unless (@spec) {
	xwarn "no file spec lines in $file\n";
	return;
    }

    my @checksums = map { split /\n/ } $out =~ /^Checksums-(\S+):\s*\n/mgi;
    @checksums = grep {!/^Sha(1|256)$/i} @checksums;
    if (@checksums) {
	xwarn "$file contains unsupported checksums:\n"
	    . join (", ", @checksums) . "\n";
	return;
    }

    my %sha1s = map { reverse split /(\S+)\s*$/m }
	$out =~ /^Checksums-Sha1:\s*\n((?:[ \t]+.*\n)+)/mgi;
    my %sha256s = map { reverse split /(\S+)\s*$/m }
	$out =~ /^Checksums-Sha256:\s*\n((?:[ \t]+.*\n)+)/mgi;
    my $md5o = Digest::MD5->new or xdie "can't initialize MD5\n";
    my $any;
    for (@spec) {
	unless (/^\s+([0-9a-f]{32})\s+(\d+)\s+(?:\S+\s+\S+\s+)?(\S+)\s*$/) {
	    xwarn "invalid file spec in $file `$_'\n";
	    next;
	}
	my ($md5, $size, $filename) = ($1, $2, $3);
	my ($sha1, $sha1size, $sha256, $sha256size);
	$filename !~ m,[/\x00],
	    or xdie "File name contains invalid characters: $file";

	if (keys %sha1s) {
	    $sha1 = $sha1s{$filename};
	    unless (defined $sha1) {
		xwarn "no sha1 for `$filename' in $file\n";
		next;
	    }
	    unless ($sha1 =~ /^\s+([0-9a-f]{40})\s+(\d+)\s*$/) {
		xwarn "invalid sha1 spec in $file `$sha1'\n";
		next;
	    }
	    ($sha1, $sha1size) = ($1, $2);
	} else {
	    $sha1size = $size;
	}

	if (keys %sha256s) {
	    $sha256 = $sha256s{$filename};
	    unless (defined $sha256) {
		xwarn "no sha256 for `$filename' in $file\n";
		next;
	    }
	    unless ($sha256 =~ /^\s+([0-9a-f]{64})\s+(\d+)\s*$/) {
		xwarn "invalid sha256 spec in $file `$sha256'\n";
		next;
	    }
	    ($sha256, $sha256size) = ($1, $2);
	} else {
	    $sha256size = $size;
	}

	unless (open FILE, '<', $filename) {
	    if ($! == ENOENT) {
		print STDERR "   skipping  $filename (not present)\n";
	    }
	    else {
		xwarn "can't read $filename:";
	    }
	    next;
	}

	$any = 1;
	print "   validating $filename\n";

	# size
	my $this_size = -s FILE;
	unless (defined $this_size) {
	    xwarn "can't fstat $filename:";
	    next;
	}
	unless ($this_size == $size) {
	    xwarn "invalid file length for $filename (wanted $size got $this_size)\n";
	    next;
	}
	unless ($this_size == $sha1size) {
	    xwarn "invalid sha1 file length for $filename (wanted $sha1size got $this_size)\n";
	    next;
	}
	unless ($this_size == $sha256size) {
	    xwarn "invalid sha256 file length for $filename (wanted $sha256size got $this_size)\n";
	    next;
	}

	# MD5
	$md5o->reset;
	$md5o->addfile(*FILE);
	my $this_md5 = $md5o->hexdigest;
	unless ($this_md5 eq $md5) {
	    xwarn "MD5 mismatch for $filename (wanted $md5 got $this_md5)\n";
	    next;
	}

	my $this_sha1;
	eval {
	    spawn(exec => ['sha1sum', $filename],
		to_string => \$this_sha1,
		wait_child => 1);
	};
	($this_sha1) = split /\s/,$this_sha1,2;
	$this_sha1 ||= '';
	unless (! keys %sha1s or $this_sha1 eq $sha1) {
	    xwarn "SHA1 mismatch for $filename (wanted $sha1 got $this_sha1)\n";
	    next;
	}

	my $this_sha256;
	eval {
	    spawn(exec => ['sha256sum', $filename],
		to_string => \$this_sha256,
		wait_child => 1);
	};
	($this_sha256) = split /\s/,$this_sha256,2;
	$this_sha256 ||= '';
	unless (! keys %sha256s or $this_sha256 eq $sha256) {
	    xwarn "SHA256 mismatch for $filename (wanted $sha256 got $this_sha256)\n";
	    next;
	}

	close FILE;

	if ($filename =~ /\.dsc$/ && $verify_sigs) {
	    $sigcheck = check_signature $filename, @rings;
	    if ($sigcheck) {
		xwarn "$filename failed signature check:\n$sigcheck";
		next;
	    } else {
		print "      Good signature found\n";
	    }
	}
    }

    $any or
	xwarn "$file didn't specify any files present locally\n";
}

sub main {
    @ARGV or xdie "no .changes or .dsc files specified\n";

    my @rings;

    # Handle config file unless --no-conf or --noconf is specified
    # The next stuff is boilerplate
    if (@ARGV and $ARGV[0] =~ /^--no-?conf$/) {
	$modified_conf_msg = "  (no configuration files read)";
	shift @ARGV;
    } else {
	my @config_files = ('/etc/devscripts.conf', '~/.devscripts');
	my %config_vars = (
			   'DSCVERIFY_KEYRINGS' => '',
			   );
	my %config_default = %config_vars;

	my $shell_cmd;
	# Set defaults
	foreach my $var (keys %config_vars) {
	    $shell_cmd .= "$var='$config_vars{$var}';\n";
	}
	$shell_cmd .= 'for file in ' . join(" ",@config_files) . "; do\n";
	$shell_cmd .= '[ -f $file ] && . $file; done;' . "\n";
	# Read back values
	foreach my $var (keys %config_vars) { $shell_cmd .= "echo \$$var;\n" }
	my $shell_out = `/bin/bash -c '$shell_cmd'`;
	@config_vars{keys %config_vars} = split /\n/, $shell_out, -1;

	foreach my $var (sort keys %config_vars) {
	    if ($config_vars{$var} ne $config_default{$var}) {
		$modified_conf_msg .= "  $var=$config_vars{$var}\n";
	    }
	}
	$modified_conf_msg ||= "  (none)\n";
	chomp $modified_conf_msg;

	$config_vars{'DSCVERIFY_KEYRINGS'} =~ s/^\s*:\s*//;
	$config_vars{'DSCVERIFY_KEYRINGS'} =~ s/\s*:\s*$//;
	@rings = split /\s*:\s*/, $config_vars{'DSCVERIFY_KEYRINGS'};
    }

    GetOptions(
	'help' => sub { usage; exit 0; },
	'version' => sub { print $version; exit 0; },
	'sigcheck|sig-check!' => \$verify_sigs,
	'u' => sub { $verify_sigs = 0 },
	'noconf|no-conf' => sub {
	    die "--$_[0] is only acceptable as the first command-line option!\n";
	},
	'default-keyrings!' => \$use_default_keyrings,
	'keyring=s@' => sub {
	    my $ring = $_[1];
	    if (-r $ring) { push @rings, $ring; }
	    else { die "Keyring $ring unreadable\n" }
	},
	'verbose' => \$verbose,
    ) or do { usage; exit 1 };

    @ARGV or xdie "no .changes or .dsc files specified\n";

    @rings = get_rings @rings if $use_default_keyrings and $verify_sigs;

    for my $file (@ARGV) {
	process_file $file, @rings;
    }

    return 0;
}

$Exit = main || $Exit;
$Exit = 1 if $Exit and not $Exit % 256;
if ($Exit) { print STDERR "Validation FAILED!!\n"; }
else { print "All files validated successfully.\n"; }
exit $Exit;