/usr/lib/news/bin/pgpverify is in inn 1:1.7.2q-44+b2.
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 | #!/usr/bin/perl -w
require '/usr/lib/news/innshellvars.pl';
# written April 1996, tale@isc.org (David C Lawrence)
# mostly rewritten 2001-03-21 by Marco d'Itri <md@linux.it>
#
# requirements:
# - GnuPG
# - perl 5.004_03 and working Sys::Syslog
# - syslog daemon
#
# There is no locking because gpg is supposed to not need it and controlchan
# will serialize control messages processing anyway.
require 5.004_03;
use strict;
# if you keep your keyring somewhere that is not the default used by gpg,
# set appropriately the next line.
my $keyring = '/etc/news/pgp/pubring.pgp';
# If you have INN and the script is able to successfully include your
# innshellvars.pl file, the value of the next two variables will be
# overridden.
my $tmpdir = '/var/log/news/';
my $syslog_facility = 'news';
# 1: print PGP output
my $debug = 0;
$debug = 1 if -t 1;
### Exit value:
### 0 good signature
### 1 no signature
### 2 unknown signature
### 3 bad signature
### 255 problem not directly related to gpg analysis of signature
##############################################################################
################ NO USER SERVICEABLE PARTS BELOW THIS COMMENT ################
##############################################################################
my $tmp = ($inn::pathtmp ? $inn::pathtmp : $tmpdir) . "/pgp$$";
$syslog_facility = $inn::syslog_facility if $inn::syslog_facility;
my $nntp_format = 0;
$0 =~ s#^.*/##; # trim /path/to/prog to prog
die "Usage: $0 < message\n" if $#ARGV != -1;
# Path to gpg binary
my $gpg;
foreach (split(/:/, $ENV{PATH}), qw(/usr/local/bin /opt/gnu/bin)) {
if (-x "$_/gpgv") {
$gpg = "$_/gpgv"; last;
}
}
fail('cannot find the gpgv binary') if not $gpg;
# this is, by design, case-sensitive with regards to the headers it checks.
# it's also insistent about the colon-space rule.
my ($label, $value, %dup, %header);
while (<STDIN>) {
# if a header line ends with \r\n, this article is in the encoding
# it would be in during an NNTP session. some article storage
# managers keep them this way for efficiency.
$nntp_format = /\r\n$/ if $. == 1;
s/\r?\n$//;
last if /^$/;
if (/^(\S+):[ \t](.+)/) {
($label, $value) = ($1, $2);
$dup{$label} = 1 if $header{$label};
$header{$label} = $value;
} elsif (/^\s/) {
fail("non-header at line $.: $_") unless $label;
$header{$label} .= "\n$_";
} else {
fail("non-header at line $.: $_");
}
}
my $pgpheader = 'X-PGP-Sig';
$_ = $header{$pgpheader};
exit 1 if not $_; # no signature
# the $sep value means the separator between the radix64 signature lines
# can have any amount of spaces or tabs, but must have at least one space
# or tab, if there is a newline then the space or tab has to follow the
# newline. any number of newlines can appear as long as each is followed
# by at least one space or tab. *phew*
my $sep = "[ \t]*(\n?[ \t]+)+";
# match all of the characters in a radix64 string
my $r64 = '[a-zA-Z0-9+/]';
fail("$pgpheader not in expected format")
unless /^(\S+)$sep(\S+)(($sep$r64{64})+$sep$r64+=?=?$sep=$r64{4})$/;
my ($version, $signed_headers, $signature) = ($1, $3, $4);
$signature =~ s/$sep/\n/g;
my $message = "-----BEGIN PGP SIGNED MESSAGE-----\n\n"
. "X-Signed-Headers: $signed_headers\n";
foreach $label (split(',', $signed_headers)) {
fail("duplicate signed $label header, can't verify") if $dup{$label};
$message .= "$label: ";
$message .= $header{$label} if $header{$label};
$message .= "\n";
}
$message .= "\n"; # end of headers
while (<STDIN>) { # read body lines
if ($nntp_format) {
# check for end of article; some news servers (eg, Highwind's
# "Breeze") include the dot-CRLF of the NNTP protocol in the
# article data passed to this script
last if $_ eq ".\r\n";
# remove NNTP encoding
s/^\.\./\./;
s/\r\n$/\n/;
}
s/^-/- -/; # pgp quote ("ASCII armor") dashes
$message .= $_;
}
$message .=
"\n-----BEGIN PGP SIGNATURE-----\n" .
"Version: $version\n" .
$signature .
"\n-----END PGP SIGNATURE-----\n";
open(TMP, ">$tmp") or fail("open $tmp: $!");
print TMP $message;
close TMP or errmsg("close $tmp: $!");
my $opts = '--quiet --status-fd=1 --logger-fd=1';
$opts .= " --keyring=$keyring" if $keyring;
open(PGP, "$gpg $opts $tmp |") or fail("failed to execute $gpg: $!");
undef $/;
$_ = <PGP>;
unlink $tmp or errmsg("unlink $tmp: $!");
if (not close PGP) {
if ($? >> 8) {
my $status = $? >> 8;
errmsg("gpg exited status $status") if $status > 1;
} else {
errmsg('gpg died on signal ' . ($? & 255));
}
}
print STDERR $_ if $debug;
my $ok = 255; # default exit status
my $signer;
if (/^\[GNUPG:\]\s+GOODSIG\s+\S+\s+(\S+)/m) {
$ok = 0;
$signer = $1;
} elsif (/^\[GNUPG:\]\s+NODATA/m or /^\[GNUPG:\]\s+UNEXPECTED/m) {
$ok = 1;
} elsif (/^\[GNUPG:\]\s+NO_PUBKEY/m) {
$ok = 2;
} elsif (/^\[GNUPG:\]\s+BADSIG\s+/m) {
$ok = 3;
}
print "$signer\n" if $signer;
exit $ok;
sub errmsg {
my $msg = $_[0];
eval 'use Sys::Syslog qw(:DEFAULT setlogsock)';
die "$0: cannot use Sys::Syslog: $@ [$msg]\n" if $@;
die "$0: cannot set syslog method [$msg]\n"
if not (setlogsock('unix') or setlogsock('inet'));
$msg .= " processing $header{'Message-ID'}" if $header{'Message-ID'};
openlog($0, 'pid', $syslog_facility);
syslog('err', '%s', $msg);
closelog();
}
sub fail {
errmsg($_[0]);
unlink $tmp;
exit 255;
}
__END__
# Copyright 2000 by Marco d'Itri
# License of the original version distributed by David C. Lawrence:
# Copyright (c) 1996 UUNET Technologies, Inc.
# 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.
# 3. All advertising materials mentioning features or use of this software
# must display the following acknowledgement:
# This product includes software developed by UUNET Technologies, Inc.
# 4. The name of UUNET Technologies ("UUNET") may not be used to endorse or
# promote products derived from this software without specific prior
# written permission.
#
# THIS SOFTWARE IS PROVIDED BY UUNET ``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 UUNET 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.
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