};
+# see RFC 4880 section 5.2.3.23
+my $revocation_reasons = { no_reason_specified => 0,
+ key_superseded => 1,
+ key_compromised => 2,
+ key_retired => 3,
+ user_id_no_longer_valid => 32,
+ };
+
# see RFC 4880 section 5.2.3.1
my $subpacket_types = { sig_creation_time => 2,
sig_expiration_time => 3,
$rsa->use_pkcs1_padding();
if (! $rsa->check_key()) {
- die "key does not check";
+ die "key does not check\n";
}
my $certtype = $args->{certification_type} + 0;
my $key_timestamp = ($args->{key_timestamp} + 0);
if ($key_timestamp > $sig_timestamp) {
- die "key timestamp must not be later than signature timestamp";
+ die "key timestamp must not be later than signature timestamp\n";
}
my $creation_time_packet = pack('CCN', 5, $subpacket_types->{sig_creation_time}, $sig_timestamp);
$sig_data_to_be_hashed.
$trailer;
-
# FIXME: handle signatures over digests other than SHA256:
my $data_hash = Digest::SHA::sha256_hex($datatosign);
my $packetlen = shift;
my $dummy;
- ($tag == $packet_types->{uid}) or die "This should not be called on anything but a User ID packet";
+ ($tag == $packet_types->{uid}) or die "This should not be called on anything but a User ID packet\n";
read($instr, $dummy, $packetlen);
- $data->{uid} = {} unless defined $data->{uid};
$data->{uid}->{$dummy} = {};
+ $data->{current}->{uid} = $dummy;
}
my $tag = shift;
my $packetlen = shift;
- ($tag == $packet_types->{sig}) or die "No calling findsig on anything other than a signature packet.";
+ ($tag == $packet_types->{sig}) or die "No calling findsig on anything other than a signature packet.\n";
my $dummy;
my $readbytes = 0;
- if ((undef $data->{key}) ||
- (undef $data->{uid}) ||
- (undef $data->{uid}->{$data->{target}->{uid}})) {
- # this is not the user ID we are looking for.
- read($instr, $dummy, $packetlen - $readbytes) or die "Could not skip past this packet.\n";
- }
+ read($instr, $dummy, $packetlen - $readbytes) or die "Could not read in this packet.\n";
- read($instr, $data, 6) or die "could not read signature header\n";
- my ($ver, $sigtype, $pubkeyalgo, $digestalgo, $subpacketsize) = unpack('CCCCn', $data);
- if ($ver != 4) {
- printf(STDERR "We only work with version 4 signatures.");
- read($instr, $dummy, $packetlen - $readbytes) or die "Could not skip past this packet.\n";
- return;
- }
- if ($pubkeyalgo != $asym_algos->{rsa}) {
- printf(STDERR "We can only work with RSA at the moment");
- read($instr, $dummy, $packetlen - $readbytes) or die "Could not skip past this packet.\n";
- return;
- }
- if ($sigtype != $sig_types->{positive_certification}) {
- # FIXME: some weird implementations might have made generic,
- # persona, or casual certifications instead of positive
- # certifications for self-sigs. Probably should handle them too.
- read($instr, $dummy, $packetlen - $readbytes) or die "Could not skip past this packet.\n";
+ if ((! defined $data->{key}) ||
+ (! defined $data->{uid}) ||
+ (! defined $data->{uid}->{$data->{target}->{uid}})) {
+ # the user ID we are looking for has not been found yet.
return;
}
- my $subpackets;
- read($instr, $subpackets, $subpacketsize) or die "could not read hashed signature subpackets.\n";
+ # FIXME: if we get two primary keys on stdin, both with the same
+ # targetd user ID, we'll store signatures from both keys, which is
+ # probably wrong.
- read($instr, $subpacketsize, 2) or die "could not read unhashed signature subpacket size.\n";
- $subpacketsize = unpack('n', $subpacketsize);
+ # the current ID is not what we're looking for:
+ return if ($data->{current}->{uid} ne $data->{target}->{uid});
- my $unhashedsubpackets;
- read($instr, $unhashedsubpackets, $subpacketsize) or die "could not read unhashed signature subpackets.\n";
-
- my $hashtail;
- read($instr, $hashtail, 2) or die "could not read left 16 bits of digest.\n";
-
- # FIXME: RSA signatures should read in how many MPIs?
+ # just storing the raw signatures for the moment:
+ push @{$data->{sigs}}, make_packet($packet_types->{sig}, $dummy);
+ return;
}
my $instr = shift;
my $fpr = shift;
my $uid = shift;
+ my $sigtime = shift;
if ((! defined $fpr) ||
(length($fpr) < 8)) {
}
my $data = { target => { fpr => $fpr,
+ uid => $uid,
},
};
my $subs = { $packet_types->{seckey} => \&findkey,
- $packet_types->{uid} => \&finduid
+ $packet_types->{uid} => \&finduid,
+ $packet_types->{sig} => \&findsig,
};
packetwalk($instr, $subs, $data);
die "The key requested was not found."
}
+ my $revocation_reason = 'No longer using this hostname';
+ if (defined $data->{revocation_reason}) {
+ $revocation_reason = $data->{revocation_reason};
+ }
+
+ my $rev_reason_subpkt = prefixsubpacket(pack('CC',
+ $subpacket_types->{revocation_reason},
+ $revocation_reasons->{user_id_no_longer_valid}).
+ $revocation_reason);
+
+ if (! defined $sigtime) {
+ $sigtime = time();
+ }
# what does a signature like this look like?
+ my $args = { key_timestamp => $data->{key}->{timestamp},
+ sig_timestamp => $sigtime,
+ certification_type => $sig_types->{certification_revocation},
+ hashed_subpackets => $rev_reason_subpkt,
+ };
+
+ return
+ make_packet($packet_types->{pubkey}, make_rsa_pub_key_body($data->{key}->{rsa}, $data->{key}->{timestamp})).
+ make_packet($packet_types->{uid}, $uid).
+ join('', @{$data->{sigs}}).
+ gensig($data->{key}->{rsa}, $uid, $args);
+}
+
- return 'abc';
+# see 5.2.3.1 for tips on how to calculate the length of a subpacket:
+sub prefixsubpacket {
+ my $subpacket = shift;
+
+ my $len = length($subpacket);
+ my $prefix;
+ use bytes;
+ if ($len < 192) {
+ # one byte:
+ $prefix = pack('C', $len);
+ } elsif ($len < 16576) {
+ my $in = $len - 192;
+ my $second = $in%256;
+ my $first = ($in - $second)>>8;
+ $prefix = pack('CC', $first + 192, $second)
+ } else {
+ $prefix = pack('CN', 255, $len);
+ }
+ return $prefix.$subpacket;
}
die "No matching key found.\n";
}
}
- elsif (/^revokeuserid$/) {
- my $fpr = shift;
- my $uid = shift;
- my $instream;
- open($instream,'-');
- binmode($instream, ":bytes");
-
- my $revcert = revokeuserid($instream, $fpr, $uid);
-
- print $revcert;
+ elsif (/^keytrans$/) {
+ # subcommands when keytrans is invoked directly are UNSUPPORTED,
+ # UNDOCUMENTED, and WILL NOT BE MAINTAINED.
+ my $subcommand = shift;
+ for ($subcommand) {
+ if (/^revokeuserid$/) {
+ my $fpr = shift;
+ my $uid = shift;
+ my $instream;
+ open($instream,'-');
+ binmode($instream, ":bytes");
+
+ my $revcert = revokeuserid($instream, $fpr, $uid, $ENV{KEYTRANS_REVSIG_TIMESTAMP});
+
+ print $revcert;
+ } else {
+ die "Unrecognized subcomand. keytrans subcommands are not a stable interface!\n";
+ }
+ }
}
else {
die "Unrecognized keytrans call.\n";
projects / monkeysphere.git / blobdiff