7ca4c4a7c2
and work with the new subst method to find innshellvars.pl. Do not truncate the tmp file when opening, in case it is really linked to another file.
242 lines
8.5 KiB
Perl
Executable file
242 lines
8.5 KiB
Perl
Executable file
#! /usr/bin/perl -ws
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# written April 1996, tale@isc.org (David C Lawrence)
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# Version 1.10
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#
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# NOTICE TO INN MAINTAINERS: The version that is shipped with INN
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# is the same as the version that I make available to the rest of the
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# world (including non-INN sites), so please make all changes through me.
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#
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# Changes from 1.9 -> 1.10
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# -- minor diddling for INN 2.0: use $inn/pathtmp if it exists, and
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# work with the new subst method to find innshellvars.pl
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# -- do not truncate the tmp file when opening, in case it is really linked
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# to another file
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#
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# Changes from 1.8 -> 1.9
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# -- match 'Bad signature' pgp output to return exit status 3 by removing
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# '^' in regexp matched on multiline string.
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#
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# Changes from 1.7 -> 1.8
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# -- ignore final dot-CRLF if article is in NNTP format
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#
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# Changes from 1.6 -> 1.7
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# -- parse PGP 5.0 'good signature' lines.
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# -- allow -test swtich; prints pgp input and output
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# -- look for pgp in INN's innshellvars.pl
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# -- changed regexp delimiters for stripping $0 to be compatible with old perl
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#
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# Changes from 1.5 -> 1.6
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# -- handle articles encoded in NNTP format ('.' starting line is doubled,
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# \r\n at line end) by stripping NNTP encoding.
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# -- exit 255 with pointer to $HOME or $PGPPATH if pgp can't find key ring.
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# (probably doesn't match the necessary error message with ViaCrypt PGP)
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# -- failures also report message-id so the article can be looked up to retry.
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#
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# Changes from 1.4 -> 1.5
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# -- force English lanugage for 'Good signature from user' by passing
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# +language=en on pgp command line, rather than setting the
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# environment variable LANGUAGE to 'en'.
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#
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# Changes from 1.3 -> 1.4
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# -- now handles wrapped headers that have been unfolded.
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# (though I do believe news software oughtn't be unfolding them.)
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# -- checks to ensure that the temporary file is really a file, and
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# not a link or some other weirdness
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# Path to pgp binary; for PGP 5.0, set the path to the pgpv binary.
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$pgp = '/usr/local/bin/pgp';
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# if you keep your keyring somewhere that is not the default used by pgp,
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# uncomment the next line and set appropriately.
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# $ENV{'PGPPATH'} = '/path/to/your/pgp/config';
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$tmpdir = "/tmp";
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### Exit value:
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### 0 good signature
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### 1 no signature
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### 2 unknown signature
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### 3 bad signature
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### 255 problem not directly related to pgp analysis of signature
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die "Usage: $0 < message\n" if @ARGV != 0;
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$0 =~ s%^.*/%%; # trim /path/to/prog to prog
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do '@ETCDIR@/innshellvars.pl';
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$pgp = $inn'pgp if $inn'pgp && $inn'pgp ne "no-pgp-found-during-configure";
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$tmp = ($inn'pathtmp ? $inn'pathtmp : $tmpdir) . "/pgp$$";
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if (! -x $pgp) {
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die "$0: $pgp: ", (-e _ ? "cannot execute" : "no such file"), "\n";
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}
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# this is, by design, case-sensitive with regards to the headers it checks.
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# it's also insistent about the colon-space rule.
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while (<>) {
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# if a header line ends with \r\n, this article is in the encoding
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# it would be in during an NNTP session. some article storage
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# managers keep them this way for efficiency.
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$nntp_format = /\r\n$/ if $. == 1;
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s/\r?\n$//;
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last if /^$/;
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if (/^(\S+):[ \t](.+)/) {
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($label, $value) = ($1, $2);
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$dup{$label} = 1 if $header{$label};
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$header{$label} = $value;
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} elsif (/^\s/) {
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&fail("$0: non-header line at $_\n") unless $label;
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$header{$label} .= "\n$_";
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} else {
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&fail("$0: non-header line at $_\n");
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}
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}
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$pgpheader = "X-PGP-Sig";
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exit 1 unless $_ = $header{$pgpheader}; # no signature
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# the regexp below might be too strict about the structure of pgp sig lines
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# the $sep value means the separator between the radix64 signature lines
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# can have any amount of spaces or tabs, but must have at least one space
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# or tab, if there is a newline then the space or tab has to follow the
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# newline. any number of newlines can appear as long as each is followed
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# by at least one space or tab. *phew*
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$sep = "[ \t]*(\n?[ \t]+)+";
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# match all of the characters in a radix64 string
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$r64 = '[a-zA-Z0-9+/]';
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&fail("$0: $pgpheader not in expected format\n")
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unless /^(\S+)$sep(\S+)(($sep$r64{64})+$sep$r64+=?=?$sep=$r64{4})$/;
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($version, $signed_headers, $signature) = ($1, $3, $4);
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$signature =~ s/$sep/\n/g;
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$message = "-----BEGIN PGP SIGNED MESSAGE-----\n\n";
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$message .= "X-Signed-Headers: $signed_headers\n";
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foreach $label (split(",", $signed_headers)) {
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&fail("$0: duplicate signed $label header, can't verify\n")
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if $dup{$label};
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$message .= "$label: ";
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$message .= "$header{$label}" if $header{$label};
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$message .= "\n";
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}
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$message .= "\n"; # end of headers
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while (<>) { # read body lines
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if ($nntp_format) {
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# check for end of article; some news servers (eg, Highwind's "Breeze")
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# include the dot-CRLF of the NNTP protocol in the article data passed
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# to this script
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last if $_ eq ".\r\n";
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# remove NNTP encoding
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s/^\.\./\./;
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s/\r\n$/\n/;
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}
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s/^-/- -/; # pgp quote ("ASCII armor") dashes
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$message .= $_; # append to output string
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}
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$message .= "\n-----BEGIN PGP SIGNATURE-----\n";
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$message .= "Version: $version\n";
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$message .= $signature;
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$message .= "\n-----END PGP SIGNATURE-----\n";
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open(TMP,">> $tmp") || &fail("$0: open > $tmp: $!\n");
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-f TMP ||
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&fail("$0: $tmp not a plain file, possible security violation attempt\n");
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(stat(_))[3] == 1 ||
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&fail("$0: $tmp has hard links, possible security violation attempt\n");
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seek TMP, 0, 0; # make sure pointer is at beginning of file
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truncate TMP, 0; # make sure file is zero length
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print TMP $message;
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close(TMP) || warn "$0: close > $tmp: $!\n";
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&fail("$0: write error for message to check\n")
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if -s $tmp != length($message);
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print $message if $test;
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$ok = 2; # unknown signature result is default
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open(PGP,"$pgp -f +language=en < $tmp 2>&1 >/dev/null |") ||
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&fail("$0: failed to execute pgp: $!\n");
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undef $/;
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$_ = <PGP>;
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print if $test;
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# MIT PGP 2.6.2:
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# Good signature from user "Robert Braver <rbraver@ohww.norman.ok.us>".
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# ViaCrypt PGP 4.0:
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# Good signature from user: Robert Braver <rbraver@ohww.norman.ok.us>
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# PGP 5.0i:
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# Good signature made 1997-07-09 21:57 GMT by key:
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# 1024 bits, Key ID B88DA9C1, Created 1996-04-10
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# "news.announce.newgroups"
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if (/Bad signature /) {
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$ok = 3;
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} elsif (/Good signature from user(: (.*)| "(.*)"\.)/ ||
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/Good signature made .* by key:\n.+\n +"(.*)"/) {
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$ok = 0;
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$signer = $+;
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} elsif (/Keyring file '(.*)' does not exist/) {
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&fail("$0: couldn't access $1. Bad \$HOME or \$PGPPATH?\n");
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}
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close(PGP) || warn "$0: closing pgp pipe returned status $?\n";
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unlink("$tmp") || warn "$0: unlink $tmp: $!\n";
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print "$signer\n" if $signer;
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exit $ok;
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sub
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fail
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{
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unlink($tmp);
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print STDERR $_[0];
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print STDERR " ... while processing $header{'Message-ID'}\n"
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if $header{'Message-ID'};
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exit 255;
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}
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# Our lawyer told me to include the following. The upshot of it is
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# that you can use the software for free as much as you like.
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# Copyright (c) 1996 UUNET Technologies, Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. All advertising materials mentioning features or use of this software
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# must display the following acknowledgement:
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# This product includes software developed by UUNET Technologies, Inc.
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# 4. The name of UUNET Technologies ("UUNET") may not be used to endorse or
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# promote products derived from this software without specific prior
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# written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY UUNET ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL UUNET BE LIABLE FOR ANY DIRECT,
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# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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# OF THE POSSIBILITY OF SUCH DAMAGE.
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