10efdc162f
even if that wasn't what you wanted to use, and secondly it looks for pubring.pgp rather than pubring.gpg even when running gpg.
579 lines
20 KiB
Perl
Executable file
579 lines
20 KiB
Perl
Executable file
#! /usr/bin/perl -ws
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do '@LIBDIR@/innshellvars.pl';
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#
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# written April 1996, tale@isc.org (David C Lawrence)
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# Version 1.14, 6 May 2001
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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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# This program is intended to be compatible with Perl 4 and Perl 5.
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#
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# Changes from 1.13.1 -> 1.14
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# -- Native support for GnuPG without the pgpgpg wrapper, using GnuPG's
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# program interface by Marco d'Itri.
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# -- Always use Sys::Syslog without any setlogsock call for Perl 5.6.0 or
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# later, since Sys::Syslog in those versions of Perl uses the C library
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# interface and is now portable.
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# -- Default to expecting the key ring in $inn'newsetc/pgp if it exists.
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# -- Fix a portability problem for Perl 4 introduced in 1.12.
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#
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# Changes from 1.13 -> 1.13.1
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# -- Nothing functional, just moved the innshellvars.pl line to the head of
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# the script, to accomodate the build process of INN.
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#
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# Changes from 1.12 -> 1.13
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# -- Use INN's syslog_facility if available.
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#
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# Changes from 1.11 -> 1.12
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# -- support for GnuPG
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# -- Use /usr/ucb/logger, if present, instead of /usr/bin/logger (the latter
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# of which, on Solaris at least, is some sort of brain damaged POSIX.2
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# command which doesn't use syslog).
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# -- made syslog work for dec_osf (version 4, at least)
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# -- fixed up priority of '.' operator vs bitwise operators
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#
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# Changes from 1.10 -> 1.11
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# -- code to log error messages to syslog.
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# See $syslog and $syslog_method configurable variables.
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# -- configurably allow date stamp on stderr error messages.
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# -- added locking for multiple concurrent pgp instances.
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# -- more clear error message if pgp exits abnormally.
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# -- identify PGP 5 "BAD signature" string.
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# -- minor diddling for INN (path to innshellvars.pl changed)
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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 the GnuPG gpgv binary, if you have GnuPG. If you do, this will
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# be used in preference to PGP. For most current control messages, you
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# need a version of GnuPG that can handle RSA signatures. If you have INN
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# and the script is able to successfully include your innshellvars.pl
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# file, the value of $inn::gpgv will override this.
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# $gpgv = '/usr/local/bin/gpgv';
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# Path to pgp binary; for PGP 5.0, set the path to the pgpv binary.
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# If you have INN and the script is able to successfully include your
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# innshellvars.pl file, the value of $inn::pgp will override this.
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$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. If you have INN and the
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# script is able to successfully include your innshellvars.pl file, this
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# will be set to $inn::newsetc/pgp if that directory exists unless you set
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# it explicitly. GnuPG will use a file named pubring.gpg in this
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# directory.
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# $keyring = '/path/to/your/pgp/config';
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# If you have INN and the script is able to successfully include your
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# innshellvars.pl file, the value of $inn::pathtmp and $inn::locks will
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# override these.
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$tmpdir = "/tmp";
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$lockdir = $tmpdir;
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# How should syslog be accessed?
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#
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# As it turns out, syslogging is very hard to do portably in versions of
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# Perl prior to 5.6.0. Sys::Syslog should work without difficulty in
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# 5.6.0 or later and will be used automatically for those versions of Perl
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# (unless $syslog_method is ''). For earlier versions of Perl, 'inet' is
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# all that's available up to version 5.004_03. If your syslog does not
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# accept UDP log packets, such as when syslogd runs with the -l flag,
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# 'inet' will not work. A value of 'unix' will try to contact syslogd
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# directly over a Unix domain socket built entirely in perl code (no
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# subprocesses). If that is not working for you, and you have the
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# 'logger' program on your system, set this variable to its full path name
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# to have a subprocess contact syslogd. If the method is just "logger",
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# the script will search some known directories for that program. If it
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# can't be found & used, everything falls back on stderr logging.
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#
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# You can test the script's syslogging by running "pgpverify < /some/text/file"
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# on a file that is not a valid news article. The "non-header at line #"
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# error should be syslogged.
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#
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# $syslog_method = 'unix'; # Unix doman socket, perl5.004_03 or higher
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# $syslog_method = 'inet'; # UDP to port 514 of localhost
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# $syslog_method = ''; # Don't ever try to do syslogging.
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$syslog_method = 'logger'; # search for the logger program
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# The next two variables are the values to be used for syslog's facility and
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# level to use, as would be found in syslog.conf. For various reasons, it is
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# impossible to economically have the script figure out how to do syslogging
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# correctly on the machine. If you have INN and the script is able to
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# successfully include you innshellvars.pl file, then the value of
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# $inn::syslog_facility will override this value of $syslog_facility;
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# $syslog_level is unaffected.
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$syslog_facility = 'news';
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$syslog_level = 'err';
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# Prepend the error message with a timestamp?
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# This is only relevant if not syslogging, when errors go to stderr.
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#
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# $log_date = 0; # zero means don't do it.
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# $log_date = 1; # non-zero means do it.
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$log_date = -t STDOUT; # do it if STDOUT is to a terminal
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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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# not syslogged, such an error is almost certainly from someone running
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# the script manually.
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die "Usage: $0 < message\n" if @ARGV != 0;
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$0 =~ s%^.*/%%; # trim /path/to/prog to prog
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$pgp = $inn'pgp if $inn'pgp && $inn'pgp ne "no-pgp-found-during-configure";
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$gpgv = $inn'gpgv if $inn'gpgv;
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$tmp = ($inn'pathtmp ? $inn'pathtmp : $tmpdir) . "/pgp$$";
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$lockdir = $inn'locks if $inn'locks;
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$syslog_facility = $inn'syslog_facility if $inn'syslog_facility;
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if (! $keyring && $inn'newsetc) {
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$keyring = $inn'newsetc . '/pgp' if -d $inn'newsetc . '/pgp';
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}
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if ($gpgv) {
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if (! -x $gpgv) {
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&fail("$0: $gpgv: " . (-e _ ? "cannot execute" : "no such file") . "\n");
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}
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} elsif (! -x $pgp) {
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&fail("$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 at line $.: $_\n") unless $label;
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$header{$label} .= "\n$_";
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} else {
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&fail("$0: non-header at line $.: $_\n");
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}
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}
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$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) || &errmsg("$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 $test;
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if ($gpgv) {
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($ok, $signer) = &gpg_check($tmp, $keyring);
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} else {
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($ok, $signer) = &pgp_check($tmp, $keyring);
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}
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print "$signer\n" if $signer;
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exit $ok;
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# Check the signature using PGP (including 2.6.2, 5.0, and the pgpgpg
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# wrapper for GnuPG).
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sub pgp_check {
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($file, $ring) = @_;
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$ENV{'PGPPATH'} = $ring if $ring;
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# The call to pgp needs to be locked because it tries to both read and
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# write a file named randseed.bin but doesn't do its own locking as it
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# should, and the consequences of a multiprocess conflict is failure to
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# verify.
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$lock = "$lockdir/LOCK.$0";
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until (&shlock($lock) > 0) {
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sleep(2);
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}
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open(PGP,"$pgp -f +language=en < $file 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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unlink($lock) || &errmsg("$0: unlink $lock: $!\n");
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unlink($file) || &errmsg("$0: unlink $file: $!\n");
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unless (close(PGP)) {
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if ($? >> 8) {
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&errmsg("$0: pgp exited status " . ($? >> 8) . "\n");
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} else {
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&errmsg("$0: pgp died on signal " . ($? & 255) . "\n");
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}
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}
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print if $test;
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# MIT PGP 2.6.2:
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# Good signature from user "Robert Braver <rbraver@ohww.norman.ok.us>".
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# ViaCrypt PGP 4.0:
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# Good signature from user: Robert Braver <rbraver@ohww.norman.ok.us>
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# GnuPG (via pgpgpg)
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# Good signature from "news.announce.newgroups"
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# PGP 5.0i:
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# Good signature made 1997-07-09 21:57 GMT by key:
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# 1024 bits, Key ID B88DA9C1, Created 1996-04-10
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# "news.announce.newgroups"
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$ok = 2; # unknown signature result is default
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if (/B[Aa][Dd] signature /) {
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$ok = 3;
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} elsif (/Good signature from user(: (.*)| "(.*)"\.)/ ||
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/Good signature from "(.*)"/ ||
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/Good signature made .* by key:\n.+\n +"(.*)"/) {
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$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 $1. Bad \$HOME or \$PGPPATH?\n");
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}
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return ($ok, $signer);
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}
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|
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# Check the signature using GnuPG.
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sub gpg_check {
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($file, $ring) = @_;
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$opts = '--quiet --status-fd=1 --logger-fd=1';
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if ($ring) {
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$opts .= " --keyring=$ring/pubring.gpg";
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} else {
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$opts .= " --keyring=pubring.gpg";
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}
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|
|
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open(PGP, "$gpgv $opts $file 2> /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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|
|
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unlink($file) || &errmsg("$0: unlink $file: $!\n");
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|
|
|
unless (close(PGP)) {
|
|
if ($? >> 8) {
|
|
&errmsg("$0: gpgv exited status " . ($? >> 8) . "\n");
|
|
} else {
|
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&errmsg("$0: gpgv died on signal " . ($? & 255) . "\n");
|
|
}
|
|
}
|
|
|
|
$ok = 255; # default exit status
|
|
if (/\[GNUPG:\]\s+GOODSIG\s+\S+\s+(\S+)/) {
|
|
$ok = 0;
|
|
$signer = $1;
|
|
} elsif (/\[GNUPG:\]\s+NODATA/ || /\[GNUPG:\]\s+UNEXPECTED/) {
|
|
$ok = 1;
|
|
} elsif (/\[GNUPG:\]\s+NO_PUBKEY/) {
|
|
$ok = 2;
|
|
} elsif (/\[GNUPG:\]\s+BADSIG\s+/) {
|
|
$ok = 3;
|
|
}
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|
|
|
return ($ok, $signer);
|
|
}
|
|
|
|
# Log an error message, attempting syslog first based on $syslog_method
|
|
# and falling back on stderr.
|
|
sub errmsg {
|
|
$_[0] =~ s/\n$//;
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|
|
|
$date = '';
|
|
if ($log_date) {
|
|
eval "require 'ctime.pl'";
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|
($date = &ctime(time)) =~ s/\d{4}\n//
|
|
unless $@;
|
|
}
|
|
|
|
if ($syslog_method && $] >= 5.006) {
|
|
eval "use Sys::Syslog";
|
|
$syslog_method = 'internal';
|
|
}
|
|
|
|
if ($syslog_method eq "logger") {
|
|
@loggers = ('/usr/ucb/logger', '/usr/bin/logger', '/usr/local/bin/logger');
|
|
foreach $try (@loggers) {
|
|
if (-x $try) {
|
|
$syslog_method = $try;
|
|
last;
|
|
}
|
|
}
|
|
$syslog_method = '' if $syslog_method eq 'logger';
|
|
}
|
|
|
|
if ($syslog_method ne '' && $syslog_method !~ m%/logger$%) {
|
|
if ($] >= 5) {
|
|
eval "use Sys::Syslog";
|
|
} else {
|
|
eval "require 'syslog.pl'";
|
|
}
|
|
}
|
|
|
|
if ($@ || $syslog_method eq '') {
|
|
warn $date, "$0: trying to use perl's syslog: $@\n" if $@;
|
|
warn $date, $_[0], "\n";
|
|
warn $date, "... while processing $header{'Message-ID'}\n"
|
|
if $header{'Message-ID'};
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|
|
|
} else {
|
|
$_[0] .= " processing $header{'Message-ID'}"
|
|
if $header{'Message-ID'};
|
|
|
|
if ($syslog_method =~ m%/logger$%) {
|
|
unless (system($syslog_method, "-i", "-p",
|
|
"$syslog_facility.$syslog_level", $_[0]) == 0) {
|
|
if ($? >> 8) {
|
|
warn $date, "$0: $syslog_method exited status ", $? >> 8, "\n";
|
|
} else {
|
|
warn $date, "$0: $syslog_method died on signal ", $? & 255, "\n";
|
|
}
|
|
$syslog_method = '';
|
|
&errmsg($_[0]);
|
|
}
|
|
|
|
} else {
|
|
# setlogsock arrived in perl 5.004_03 to enable Sys::Syslog
|
|
# to use a Unix domain socket to talk to syslogd, which is
|
|
# the only way to do it when syslog runs with the -l switch.
|
|
if ($syslog_method eq "unix") {
|
|
if ($^O eq "dec_osf" && $] >= 5) {
|
|
eval 'sub Sys::Syslog::_PATH_LOG { "/dev/log" }';
|
|
}
|
|
if ($] <= 5.00403 || ! eval "setlogsock('unix')") {
|
|
warn $date, "$0: cannot use syslog_method 'unix' on this system\n";
|
|
$syslog_method = '';
|
|
&errmsg($_[0]);
|
|
return;
|
|
}
|
|
}
|
|
|
|
# unfortunately, there is no way to definitively know in this program if
|
|
# the message was logged. I wish there were a way to send a message
|
|
# to stderr if and only if the syslog attempt failed.
|
|
&openlog($0, 'pid', $syslog_facility);
|
|
&syslog($syslog_level, $_[0]);
|
|
&closelog();
|
|
}
|
|
}
|
|
}
|
|
|
|
sub fail {
|
|
unlink($tmp);
|
|
&errmsg($_[0]);
|
|
exit 255;
|
|
}
|
|
|
|
# get a lock in essentially the same fashion as INN's shlock.
|
|
# return 1 on success, 0 for normal failure, -1 for abnormal failure.
|
|
# "normal failure" is that a lock is apparently in use by someone else.
|
|
sub shlock {
|
|
local($file) = @_;
|
|
local($ltmp, $pid);
|
|
|
|
unless (defined(&ENOENT)) {
|
|
eval "require POSIX qw(:errno_h)";
|
|
if ($@) {
|
|
# values taken from BSD/OS 3.1
|
|
sub ENOENT { 2 }
|
|
sub ESRCH { 3 }
|
|
sub EEXIST { 17 }
|
|
}
|
|
}
|
|
|
|
$ltmp = ($file =~ m#(.*/)#)[0] . "shlock$$";
|
|
|
|
# this should really attempt to use another temp name
|
|
-e $ltmp && (unlink($ltmp) || return -1);
|
|
|
|
open(LTMP, ">$ltmp") || return -1;
|
|
print LTMP "$$\n" || (unlink($ltmp), return -1);
|
|
close(LTMP) || (unlink($ltmp), return -1);
|
|
|
|
if (!link($ltmp, $file)) {
|
|
if ($! == &EEXIST) {
|
|
if (open(LOCK, "<$file")) {
|
|
$pid = <LOCK>;
|
|
if ($pid =~ /^\d+$/ && (kill(0, $pid) == 1 || $! != &ESRCH)) {
|
|
unlink($ltmp);
|
|
return 0;
|
|
}
|
|
|
|
# ok, the pid in the lockfile is not a number or no longer exists.
|
|
close(LOCK); # silent failure is ok here
|
|
|
|
# unlink failed
|
|
if (unlink($file) != 1 && $! != &ENOENT) {
|
|
unlink($ltmp);
|
|
return 0;
|
|
}
|
|
|
|
# check if open failed for reason other than file no longer present
|
|
} elsif ($! != &ENOENT) {
|
|
unlink($ltmp);
|
|
return -1;
|
|
}
|
|
|
|
# either this process unlinked the lockfile because it was bogus,
|
|
# or between this process's link() and open() the other process
|
|
# holding the lock unlinked it. This process can now try to aquire.
|
|
if (! link($ltmp, $file)) {
|
|
unlink($ltmp);
|
|
return $! == &EEXIST ? 0 : -1; # maybe another proc grabbed the lock
|
|
}
|
|
|
|
} else { # first attempt to link failed
|
|
unlink($ltmp);
|
|
return 0;
|
|
}
|
|
}
|
|
unlink($ltmp);
|
|
return 1;
|
|
}
|
|
|
|
# Our lawyer told me to include the following. The upshot of it is
|
|
# that you can use the software for free as much as you like.
|
|
|
|
# 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.
|
|
|
|
# Local variables:
|
|
# cperl-indent-level: 2
|
|
# fill-column: 74
|
|
# End:
|