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#!/usr/bin/perl
use strict;
use warnings;
use Date::Parse;
my $gpg_verification_line_distance = 0;
while (<STDIN>) {
my $in_header = 1 .. /^$/;
my $in_body = /^$/ .. eof;
if ($in_header) {
print $_;
} else {
print;
$gpg_verification_line_distance++;
if (m/PGP output follows \(current time: (?<time>[^(]+)\)/) {
my $timestamp = str2time($+{time});
if (abs(time() - $timestamp) > 2) {
print "WARNING: GPG signature verification time is different from current time\n";
print "WARNING: The signature may be a fake!\n";
} else {
$gpg_verification_line_distance = 0;
}
}
if (m/^gpg: Signature made .*/) {
if ($gpg_verification_line_distance != 1) {
print "WARNING: GPG signature without valid verification timestamp!\n";
print "WARNING: The signature may be a fake!\n";
}
}
if (m/^gpg:\s+issuer ".*"$/) {
if ($gpg_verification_line_distance == 3) {
$gpg_verification_line_distance--;
}
}
if (m/^gpg: Good signature from .*/) {
if ($gpg_verification_line_distance != 3) {
print "WARNING: GPG signature without valid verification timestamp!\n";
print "WARNING: The signature may be a fake!\n";
}
}
}
}
# vim:set ft=perl:
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