/
signd
executable file
·1083 lines (1006 loc) · 32.7 KB
/
signd
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#!/usr/bin/perl
#
# Copyright (c) 2006-2013 Michael Schroeder, Novell Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program (see the file COPYING); if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
################################################################
use strict;
use warnings;
use Socket qw/IPPROTO_TCP PF_INET SOCK_STREAM SOL_SOCKET SO_REUSEADDR SO_KEEPALIVE INADDR_ANY inet_aton inet_ntoa sockaddr_in getnameinfo/;
use POSIX;
use Math::BigInt;
use MIME::Base64;
use Encode;
use bytes;
use File::Temp qw/tempdir/;
use File::Path qw/remove_tree/;
use Digest::SHA;
my $have_gcrypt;
eval {
require Crypt::GCrypt::Sexp;
require Crypt::GCrypt::MPI;
require Crypt::GCrypt;
die unless defined &Crypt::GCrypt::pk_sign;
Crypt::GCrypt::gcrypt_version(); # initialize lib
$have_gcrypt = 1;
};
my @allows;
my %map;
my $signhost = '127.0.0.1';
my $port = 5167;
my $proxyport = 5167;
my $signuser = '';
my $gpg = '/usr/bin/gpg';
my $openssl = '/usr/bin/openssl';
my $phrases = '';
my $tmpdir = '/run/signd';
my $patchclasstime;
my $conf = '/etc/sign.conf';
my $allow_unprivileged_ports = 0;
my $logfile;
my @pinentrymode;
# request data
my $oldproto = 0;
my $peer = 'unknown';
sub printlog {
my ($msg) = @_;
my @lt = localtime(time);
my $year = $lt[5] + 1900;
my $month = $lt[4] + 1;
printf "%04d-%02d-%02d %02d:%02d:%02d: %s\n", $year, $month, @lt[3,2,1,0], $msg;
}
# convert CIDR prefix to netmask array
sub calc_netmask {
my $prefix = @_;
my $mask = (2 ** $prefix - 1) << (32 - $prefix);
my @netmask = unpack( "C4", pack( "N", $mask ) );
return @netmask;
}
# Check if an ip falls within a CIDR-style subnet
sub ip_in_network {
my ($ip, $network) = @_;
return 0 unless $network =~ /^([0-9\.]+)\/([0-9]+)$/;
my @ip_a = split '\.', $ip;
my @network_a = split '\.', "$1.0.0.0.0";
my @netmask_a = unpack('C4', pack('N', 0xffffffff >> $2));
for (my $i = 0; $i < 4; $i++) {
return 0 if ($ip_a[$i] | $netmask_a[$i]) != ($network_a[$i] | $netmask_a[$i]);
}
return 1;
}
sub decodetaglenoff {
my ($pkg) = @_;
my $tag = unpack('C', $pkg);
die("not a gpg packet\n") unless $tag & 128;
my $len;
my $off = 1;
if ($tag & 64) {
# new packet format
$tag &= 63;
$len = unpack('C', substr($pkg, 1));
if ($len < 192) {
$off = 2;
} elsif ($len >= 192 && $len < 224) {
$len = (($len - 192) << 8) + unpack('C', substr($pkg, 2)) + 192;
$off = 3;
} elsif ($len == 255) {
$len = unpack('N', substr($pkg, 2));
$off = 6;
} else {
die("can't deal with partial body lengths\n");
}
} else {
# old packet format
if (($tag & 3) == 0) {
$len = unpack('C', substr($pkg, 1));
$off = 2;
} elsif (($tag & 3) == 1) {
$len = unpack('n', substr($pkg, 1));
$off = 3;
} elsif (($tag & 3) == 2) {
$len = unpack('N', substr($pkg, 1));
$off = 5;
} else {
die("can't deal with not specified packet length\n");
}
$tag = ($tag & 60) >> 2;
}
return ($tag, $len, $off);
}
sub encodetag {
my ($tag, $pack) = @_;
my $l = length($pack);
if ($l < 192) {
return pack("CC", $tag + 192, $l).$pack;
} elsif ($l < 8384) {
$l = $l - 192;
$l += (192 << 8);
return pack("Cn", $tag + 192, $l).$pack;
} else {
return pack("CCN", $tag + 192, 255, $l).$pack;
}
}
sub priv2pub {
my ($privkey, $infos) = @_;
my $pubkey = '';
while ($privkey ne '') {
my ($tag, $len, $off) = decodetaglenoff($privkey);
#print "tag=$tag, len=$len off=$off\n";
my $pack = substr($privkey, $off, $len);
$privkey = substr($privkey, $len + $off);
my $ptag;
if ($tag == 5) {
$ptag = 6;
} elsif ($tag == 7) {
$ptag = 14;
} else {
next;
}
my $pkver = unpack('C', $pack);
#print "pubkey ver $pkver\n";
my ($mpioff, $pkalgo);
if ($pkver == 3) {
my ($t, $v);
(undef, $t, $v, $pkalgo) = unpack('CNnC', $pack);
$mpioff = 8;
} elsif ($pkver == 4) {
my $t;
(undef, $t, $pkalgo) = unpack('CNC', $pack);
$mpioff = 6;
} else {
die("unknown public key version $pkver\n");
}
my $info = $infos ? {} : undef;
push @$infos, $info if $info;
$info->{'algo'} = $pkalgo if $info;
my $mpinum;
my $smpinum;
if ($pkalgo == 1) { # RSA
$mpinum = 2;
$smpinum = 4;
} elsif ($pkalgo == 17) { # DSA
$mpinum = 4;
$smpinum = 1;
} elsif ($pkalgo == 16 || $pkalgo == 20) { # Elgamal
$mpinum = 3;
$smpinum = 1;
} elsif ($pkalgo == 22) { # EdDSA
$mpinum = 1;
$smpinum = 1;
my $oidlen = unpack('C', substr($pack, $mpioff));
die("bad curve len") if $oidlen == 0 || $oidlen == 255;
$info->{'curve'} = substr($pack, $mpioff + 1, $oidlen) if $info;
$mpioff += $oidlen + 1;
} else {
die("unknown public key algorithm $pkalgo\n");
}
while ($mpinum > 0) {
my $ml = unpack('n', substr($pack, $mpioff, 2));
$ml = (($ml + 7) >> 3) + 2;
push @{$info->{'mpis'}}, substr($pack, $mpioff + 2, $ml - 2) if $info;
$mpioff += $ml;
$mpinum--;
}
if ($info) {
my $s2k = unpack('C', substr($pack, $mpioff, 1));
if ($s2k == 0) {
my $smpioff = $mpioff + 1;
while ($smpinum > 0) {
my $ml = unpack('n', substr($pack, $smpioff, 2));
$ml = (($ml + 7) >> 3) + 2;
push @{$info->{'smpis'}}, substr($pack, $smpioff + 2, $ml - 2);
$smpioff += $ml;
$smpinum--;
}
}
$info->{'fingerprint'} = Digest::SHA::sha1_hex(pack('Cn', 0x99, $mpioff).substr($pack, 0, $mpioff));
}
$pack = substr($pack, 0, $mpioff);
$pubkey .= encodetag($ptag, $pack);
}
return $pubkey;
}
sub striptofirst {
my ($pkg) = @_;
my ($tag, $len, $off) = decodetaglenoff($pkg);
return substr($pkg, 0, $off + $len);
}
sub packlen {
my ($len) = @_;
if ($len >= 128) {
my $lenl = $len >> 8 ? $len >> 16 ? $len >> 24 ? 4 : 3 : 2 : 1;
return pack("Ca*", $lenl | 0x80, substr(pack("N", $len), -$lenl));
} else {
return pack("C", $len);
}
}
sub packtag {
return chr($_[0]).packlen(length($_[1])).$_[1];
}
sub packmpi {
my ($mpi) = @_;
$mpi = chr(0).$mpi;
$mpi = substr($mpi, 1) while length($mpi) > 1 && ord($mpi) == 0 && (ord(substr($mpi, 1, 1)) & 0x80) == 0;
return chr(2).packlen(length($mpi)).$mpi;
}
sub priv2openssl_ed25519 {
my ($q, $s) = @_;
die("bad ed25519 Q\n") unless length($q) == 33 && unpack('C', $q) == 0x40;
die("bad ed25519 S\n") unless length($s) <= 32;
$s = "\0$s" while length($s) < 32;
my $asn1 = '';
$asn1 .= packtag(0x02, "\x00"); # INTEGER 0
$asn1 .= packtag(0x30, "\x06\x03\x2b\x65\x70"); # SEQUENCE(OID 1.3.101.112)
$asn1 .= packtag(0x04, packtag(0x04, $s)); # OCTET_STRING(OCTET_STRING(key))
$asn1 = packtag(0x30, $asn1);
my $base64 = encode_base64($asn1, '');
my $pem = "-----BEGIN PRIVATE KEY-----\n";
$pem .= "$_\n" for $base64 =~ /(.{1,64})/g;
$pem .= "-----END PRIVATE KEY-----\n";
return $pem;
}
sub priv2openssl_rsa {
my (@s) = @_;
# calculate missing stuff:
# modulus INTEGER, -- n
# publicExponent INTEGER, -- e
# privateExponent INTEGER, -- d 2
# prime1 INTEGER, -- p 4
# prime2 INTEGER, -- q 3
# exponent1 INTEGER, -- d mod (p-1)
# exponent2 INTEGER, -- d mod (q-1)
# coefficient INTEGER, -- (inverse of q) mod p
my $d = Math::BigInt->new('0x' . unpack('H*', $s[2]));
my $p = Math::BigInt->new('0x' . unpack('H*', $s[4]));
my $q = Math::BigInt->new('0x' . unpack('H*', $s[3]));
my $ex1 = $d->copy()->bmod($p->copy()->bdec());
my $ex2 = $d->copy()->bmod($q->copy()->bdec());
$ex1 = pack('H*', substr($ex1->as_hex(), 2));
$ex2 = pack('H*', substr($ex2->as_hex(), 2));
# asn1 encode
my $asn1 = '';
$asn1 .= packmpi(chr(0));
$asn1 .= packmpi($s[0]);
$asn1 .= packmpi($s[1]);
$asn1 .= packmpi($s[2]);
$asn1 .= packmpi($s[4]);
$asn1 .= packmpi($s[3]);
$asn1 .= packmpi($ex1);
$asn1 .= packmpi($ex2);
$asn1 .= packmpi($s[5]);
$asn1 = packtag(0x30, $asn1);
# pem encode
my $base64 = encode_base64($asn1, '');
my $pem = "-----BEGIN RSA PRIVATE KEY-----\n";
$pem .= "$_\n" for $base64 =~ /(.{1,64})/g;
$pem .= "-----END RSA PRIVATE KEY-----\n";
return $pem;
}
sub priv2openssl {
my ($gpgpackets, $search_for) = @_;
die("empty privkey\n") unless $gpgpackets;
$search_for ||= 5;
while ($gpgpackets ne '') {
my ($tag, $len, $off) = decodetaglenoff($gpgpackets);
my $pack = substr($gpgpackets, $off, $len);
$gpgpackets = substr($gpgpackets, $len + $off);
next unless $tag == $search_for;
my $pkver = unpack('C', $pack);
my ($mpioff, $pkalgo);
if ($pkver == 3) {
my ($t, $v);
(undef, $t, $v, $pkalgo) = unpack('CNnC', $pack);
$mpioff = 8;
} elsif ($pkver == 4) {
my $t;
(undef, $t, $pkalgo) = unpack('CNC', $pack);
$mpioff = 6;
} else {
die("unknown public key version $pkver\n");
}
$pack = substr($pack, $mpioff);
my ($mpinum, $smpinum, $curve);
if ($pkalgo == 22) {
my $curvelen = unpack('C', $pack);
die("bad EdDSA curve len\n") if $curvelen == 0 || $curvelen == 255 || $curvelen + 1 > length($pack);
$curve = substr($pack, 1, $curvelen);
$pack = substr($pack, $curvelen + 1);
$mpinum = 1;
$smpinum = 1;
} elsif ($pkalgo == 1) {
$mpinum = 2;
$smpinum = 4;
} else {
die("not an RSA or EdDSA private key\n");
}
my @s;
for my $i (0..($mpinum + $smpinum - 1)) {
if ($i == $mpinum) {
my $encrypted = unpack('C', $pack);
die("private key is encrypted\n") if $encrypted;
$pack = substr($pack, 1);
}
my $ml = unpack('n', $pack);
$ml = (($ml + 7) >> 3);
die("pack too small\n") unless length($pack) >= 2 + $ml;
push @s, substr($pack, 2, $ml);
$pack = substr($pack, 2 + $ml);
}
return priv2openssl_ed25519(@s) if $pkalgo == 22 && $curve eq "\x2b\x06\x01\x04\x01\xda\x47\x0f\x01";
return priv2openssl_rsa(@s) if $pkalgo == 1;
die("unsupported pubkey algorithm/curve\n");
}
die("no private key found\n");
}
sub patchclasstime {
my ($sig, $t) = @_;
die("timeclass is not 10 hex nibbles\n") unless $t =~ /^[0-9a-fA-F]{10}$/s;
my ($tag, $len, $off) = decodetaglenoff($sig);
die("not a signature\n") unless $tag == 2;
die("not a v3 signature\n") unless ord(substr($sig, $off, 1)) == 3;
substr($sig, $off + 2, 5, pack('H*', $t));
return $sig;
}
sub sign_with_gcrypt {
my ($info, $hash, $hashalgo) = @_;
die("sign_with_gcrypt: missing fingerprint\n") unless $info->{'fingerprint'};
my $issuer = substr($info->{'fingerprint'}, -16);
die("bad hash $hash\n") unless $hash =~ /^((?:[0-9a-fA-F][0-9a-fA-F])+)\@(0[01][0-9a-fA-F]{8})$/;
my $extra = $2;
$hash = pack('H*', $1);
$hashalgo = lc($hashalgo);
my $pgphashalgo;
$pgphashalgo = 2 if $hashalgo eq 'sha1';
$pgphashalgo = 8 if $hashalgo eq 'sha256';
$pgphashalgo = 10 if $hashalgo eq 'sha512';
die("sign_with_gcrypt: bad hashalgo $hashalgo\n") unless $pgphashalgo;
die("sign_with_gcrypt: only RSA supported\n") unless $info->{'algo'} == 1;
die("sign_with_gcrypt: missing MPIs\n") unless @{$info->{'mpis'} || []} == 2 && @{$info->{'smpis'} || []} == 4;
my ($n, $e, $d, $p, $q, $u) = map {Crypt::GCrypt::MPI->new('format' => Crypt::GCrypt::MPI::FMT_USG(), 'value' => $_)} @{$info->{'mpis'}}, @{$info->{'smpis'}};
my $data = Crypt::GCrypt::Sexp->build("(data (flags pkcs1) (hash $hashalgo %b))", $hash);
my $skey = Crypt::GCrypt::Sexp->build("(private-key (rsa (n %M) (e %M) (d %M) (p %M) (q %M) (u %M)))", $n, $e, $d, $p, $q, $u);
my $res = Crypt::GCrypt::pk_sign($data, $skey);
my $sv = $res->nth_mpi(1, Crypt::GCrypt::MPI::FMT_USG(), 's');
die("could not extract sign result\n") unless $sv;
my $sigdata = $sv->print(Crypt::GCrypt::MPI::FMT_PGP());
my $v3sig = pack('CCH10H16CCa2', 3, 5, $extra, $issuer, $info->{'algo'}, $pgphashalgo, substr($hash, 0, 2)).$sigdata;
return encodetag(2, $v3sig);
}
sub swrite {
my ($sock, $data) = @_;
local *S = $sock;
while (length($data)) {
my $l = syswrite(S, $data, length($data));
die("write: $!\n") unless $l;
$data = substr($data, $l);
}
}
sub checkbadchar {
my ($str, $what) = @_;
die("bad character in $what\n") if $str =~ /[\000-\037]/;
eval {
Encode::_utf8_on($str);
encode('UTF-8', $str, Encode::FB_CROAK);
};
die("$what is not utf-8\n") if $@;
}
my $testmode = (($ARGV[0] || '') eq '-t') ? 1 : 0;
$testmode = 2 if ($ARGV[0] || '') eq '--test-sign';
if ($testmode) {
$conf = $ENV{SIGN_CONF} if $ENV{SIGN_CONF};
die("Crypt::GCrypt is not available\n") if ($ENV{SIGN_GCRYPT} || '') eq 'force' && !$have_gcrypt;
undef $have_gcrypt if ($ENV{SIGN_GCRYPT} || '') eq 'disable';
}
local *F;
open(F, '<', $conf) || die("$conf: $!\n");
while(<F>) {
chomp;
next if /^#/;
my @s = split(' ', $_);
next unless @s;
if ($s[0] eq 'server:') {
$signhost = $s[1];
next;
}
if ($s[0] eq 'port:') {
$port = $proxyport = $s[1];
next;
}
if ($s[0] eq 'proxyport:') {
$proxyport = $s[1];
next;
}
if ($s[0] eq 'allow:') {
shift @s;
push @allows, @s;
next;
}
if ($s[0] eq 'map:') {
$map{$s[1]} = defined($s[2]) ? $s[2] : '';
next;
}
if ($s[0] eq 'user:') {
$signuser = $s[1];
next;
}
if ($s[0] eq 'gpg:') {
$gpg = $s[1];
next;
}
if ($s[0] eq 'openssl:') {
$openssl = $s[1];
next;
}
if ($s[0] eq 'phrases:') {
$phrases = $s[1];
next;
}
if ($s[0] eq 'tmpdir:') {
$tmpdir = $s[1];
next;
}
if ($s[0] eq 'patchclasstime:') {
$patchclasstime = $s[1];
next;
}
if ($s[0] eq 'allow-unprivileged-ports:') {
$allow_unprivileged_ports = ($s[1] =~ /^true$/i) ? 1 : 0;
next;
}
if ($s[0] eq 'logfile:') {
$logfile = $s[1];
next;
}
if ($s[0] eq 'gnupghome:') {
$ENV{GNUPGHOME} = $s[1];
next;
}
}
my $myname = $phrases ? 'signd' : 'signproxy';
die("will not proxy to myself\n") if $signhost eq '127.0.0.1' && $port eq $proxyport && !$phrases;
my $signaddr = inet_aton($signhost);
die("$signhost: unknown host\n") unless $signaddr;
@pinentrymode = ( '--pinentry-mode=loopback' ) if have_pinentry_mode();
my @argv;
if ($testmode) {
die("test mode need phrases\n") unless $phrases;
# test mode
$| = 1;
if ($testmode == 2) {
*CLNT = *STDIN;
@argv = readreq();
} else {
@argv = @ARGV;
shift @argv;
}
*CLNT = *STDOUT;
goto testit;
}
if (($ARGV[0] || '') eq '-f') {
my $pid = fork();
die("fork") if !defined($pid) || $pid < 0;
#exit(0) if $pid > 0;
if ($pid > 0) {
open(PID, '>/run/signd.pid') || die("/run/signd.pid: $!\n");
print PID "$pid\n";
close PID;
exit(0);
}
}
POSIX::setsid();
$SIG{'PIPE'} = 'IGNORE';
$| = 1;
if ($logfile) {
open(STDOUT, '>>', $logfile) || die("Could not open $logfile: $!\n");
open(STDERR, ">&STDOUT");
}
printlog("$myname started");
socket(MS , PF_INET, SOCK_STREAM, IPPROTO_TCP) || die "socket: $!\n";
setsockopt(MS, SOL_SOCKET, SO_REUSEADDR, pack("l",1));
setsockopt(MS, SOL_SOCKET, SO_KEEPALIVE, pack("l",1));
bind(MS, sockaddr_in($proxyport, INADDR_ANY)) || die "bind: $!\n";
listen(MS , 512) || die "listen: $!\n";
my %chld = ();
my $clntaddr;
while (1) {
$clntaddr = accept(CLNT, MS);
next unless $clntaddr;
my $pid = fork();
last if $pid == 0;
die if $pid == -1;
close CLNT;
$chld{$pid} = 1;
while (($pid = waitpid(-1, keys(%chld) > 10 ? 0 : POSIX::WNOHANG())) > 0) {
delete $chld{$pid};
}
}
$SIG{'__DIE__'} = sub {
die(@_) if $^S;
my $err = $_[0];
chomp $err;
printlog("$peer: $err");
reply(1, "$err\n");
};
my ($sport, $saddr) = sockaddr_in($clntaddr);
$peer = inet_ntoa($saddr);
die("not coming from a reserved port\n") if !$allow_unprivileged_ports && ($sport < 0 || $sport > 1024);
my $allowed = 0;
my ($hosterr, $hostname, $servicename) = getnameinfo($clntaddr);
my $hostnameinfo;
for my $allow (@allows) {
$hostnameinfo ||= [ getnameinfo($clntaddr) ] if $allow !~ /^[0-9\.]+(:?\/[0-9]+)?$/;
if (ip_in_network($peer, $allow) || $peer eq $allow || ($hostnameinfo && $hostnameinfo->[1] && $hostnameinfo->[1] eq $allow)) {
$allowed = 1;
last;
}
}
die("illegal host $peer\n") unless $allowed;
# read request from client, split into argv array
sub readreq {
my $pack = '';
sysread(CLNT, $pack, 1024);
die("zero size packet\n") if length($pack) == 0;
die("packet too small\n") if length($pack) < 4;
my ($userlen, $arg) = unpack("nn", $pack);
while (length($pack) < 4 + $userlen + $arg) {
sysread(CLNT, $pack, 1024, length($pack)) || die("packet read error\n");
}
die("packet size mismatch\n") if length($pack) != 4 + $userlen + $arg;
if ($arg == 0 && $userlen != 0) {
# new format
die("packet too small\n") unless $userlen >= 2;
my $narg = unpack("n", substr($pack, 4));
die("packet too small\n") unless $userlen >= 2 + $narg * 2;
my @argl = unpack('n' x $narg, substr($pack, 6));
@argv = unpack('a'.join('a', @argl), substr($pack, 6 + $narg * 2));
} else {
$oldproto = 1;
if ($userlen == 0 && $arg == 0) {
@argv = ('ping', '');
} else {
@argv = ('sign', substr($pack, 4, $userlen), substr($pack, 4 + $userlen, $arg));
}
# the old protocol has the hashalgo attached to the arg instead of the user
if ($argv[-1] =~ /^(.*?):(.*$)/) {
$argv[1] = "$1:$argv[1]";
$argv[-1] = $2;
}
if ($argv[-1] eq 'PUBKEY') {
pop @argv;
$argv[0] = 'pubkey';
}
}
return @argv;
}
sub bindreservedport {
my ($sock) = @_;
local *S = $sock;
my %blacklist;
local *BL;
if (open(BL, "</etc/bindresvport.blacklist")) {
while(<BL>) {
chomp;
next unless /^\s*(\d+)/;
$blacklist{0 + $1} = 1;
}
close BL;
}
while (1) {
my $po;
for ($po = 600; $po < 1024; $po++) {
next if $blacklist{$po};
return if bind(S, sockaddr_in($po, INADDR_ANY));
}
sleep(3);
}
}
# proxy a request to another sign server
sub doproxy {
my ($cmd, $user, $hashalgo, @args) = @_;
unshift @args, $cmd, $user;
$args[1] = "$hashalgo:$user" if $hashalgo ne 'SHA1';
#forward to next server
socket(CS , PF_INET, SOCK_STREAM, IPPROTO_TCP) || die("socket: $!\n");
bindreservedport(*CS);
my $pack;
if ($args[0] eq 'sign' && $oldproto) {
my $arg = $args[2];
$arg = "$hashalgo:$arg" if $hashalgo ne 'SHA1';
$pack = pack("nn", length($user), length($arg)).$user.$arg;
} elsif ($args[0] eq 'pubkey' && $oldproto) {
my $arg = 'PUBKEY';
$arg = "$hashalgo:$arg" if $hashalgo ne 'SHA1';
$pack = pack("nn", length($user), length($arg)).$user.$arg;
} else {
$pack = pack('n' x (1 + @args), scalar(@args), map {length($_)} @args).join('', @args);
$pack = pack('nn', length($pack), 0).$pack;
}
setsockopt(CS, SOL_SOCKET, SO_KEEPALIVE, pack("l",1));
connect(CS, sockaddr_in($port, $signaddr)) || die("connect: $!\n");
swrite(*CS, $pack);
while (1) {
my $buf = '';
my $r = sysread(CS, $buf, 8192);
if (!defined($r)) {
die("sysread: $!\n") if $! != POSIX::EINTR;
next;
}
last unless $r;
swrite(*CLNT, $buf);
}
}
sub cleanup_tmp_gpg {
my ($unlinks) = @_;
return unless defined $unlinks;
if (ref($unlinks) eq 'ARRAY') {
for (@{$unlinks || []}) {
unlink($_);
}
} elsif (-d $unlinks) {
remove_tree($unlinks);
}
}
sub rungpg {
my ($stdin, $unlinks, $prg, @args) = @_;
local *RH;
local *WH;
local *KID;
pipe RH, WH;
my $pid = open(KID, "-|");
if (!defined $pid) {
cleanup_tmp_gpg($unlinks) if $unlinks;
die("could not fork: $!\n");
exit(0);
}
if (!$pid) {
delete $SIG{'__DIE__'};
close RH;
if (!open(STDERR, ">&STDOUT")) {
print STDOUT "can't dup stdout: $!\n";
exit(1);
}
open(STDOUT, ">&WH") || die("can't dup writepipe: $!\n");
open(STDIN, "<$stdin") || die("$stdin: $!\n");
close WH;
exec $prg, @args;
die("$prg: $!\n");
}
close WH;
my $out = '';
my $err = '';
1 while sysread(KID, $err, 4096, length($err)) > 0;
1 while sysread(RH, $out, 4096, length($out)) > 0;
close(RH);
my $status = 0;
$status = $? || 255 unless close KID;
$status >>= 8 if $status >= 256;
return ($status, $out, $err);
}
sub rungpg_fatal {
my ($stdin, $unlinks, $prg, @args) = @_;
my ($status, $out, $err) = rungpg($stdin, $unlinks, $prg, @args);
if ($status) {
$err = "Error $status" if $err eq '';
$err =~ s/\n$//s;
cleanup_tmp_gpg($unlinks) if $unlinks;
die("$err\n");
}
return $out;
}
sub prepare_tmp_gnupghome {
my ($tmpdir) = @_;
my $tdir = tempdir('XXXXXXXX', DIR => $tmpdir, CLEANUP => 1);
chmod 0700, $tdir;
mkdir("$tdir/gnupg", 0700) || die "Could not create $tdir/gnupg: $!\n";
return ($tdir, "$tdir/gnupg");
}
sub have_pinentry_mode {
my ($status) = rungpg('/dev/null', undef, $gpg, '--pinentry-mode=loopback', '--version');
return !$status;
}
sub reply {
my ($status, $err, @out) = @_;
my $out;
if (!@out || $status) {
$out = ''; # always use "old protocol" here
} elsif ($oldproto) {
die("only one reply supported in old protocol") if @out != 1;
$out = $out[0];
} else {
$out = pack('n' x (1 + scalar(@out)), scalar(@out), map {length($_)} @out).join('', @out);
}
my $ret = pack("nnn", $status, length($out), length($err)).$out.$err;
swrite(*CLNT, $ret);
close CLNT;
exit(0);
}
### commands
sub cmd_ping {
my ($cmd, $user, $hashalgo, @args) = @_;
return (0, '');
}
sub cmd_keygen {
my ($cmd, $user, $hashalgo, @args) = @_;
die("keygen: at least five arguments expected\n") if @args < 4;
my $type = $args[0];
my $expire = $args[1];
die("bad expire format\n") unless $expire =~ /^\d{1,10}$/s;
my $real = $args[2];
my $email = $args[3];
checkbadchar($real, 'real name');
checkbadchar($email, 'email');
my $length;
if ($type eq 'ed25519') {
$length = 'Ed25519';
$type = 'EDDSA';
} else {
die("bad type: $type\n") unless $type =~ /^(dsa|rsa)\@(1024|2048|4096)$/s;
$length = $2;
$type = $1;
}
my $org_gnupghome = $ENV{GNUPGHOME};
my $tdir;
($tdir, $ENV{GNUPGHOME}) = prepare_tmp_gnupghome($tmpdir);
# write params file
my $batch;
if ($type eq 'EDDSA') {
$batch = "Key-Type: $type\nKey-Curve: $length\n";
} else {
$batch = "Key-Type: $type\nKey-Length: $length\n";
}
$batch .= "Key-Usage: sign\nName-Real: $real\nName-Email: $email\nExpire-Date: ${expire}d\n%no-protection\n";
local *F;
open(F, ">$tdir/params") || die("$tdir/params: $!\n");
(syswrite(F, $batch) || 0) == length($batch) || die("keygen parameter write error\n");
close(F) || die("keygen parameter close error\n");
rungpg_fatal('/dev/null', $tdir, $gpg, '--batch', '--no-secmem-warning', '--gen-key', "$tdir/params");
# get the keyid so we can add a signature
my $keyid = rungpg_fatal('/dev/null', $tdir, $gpg, '--list-keys', '--no-secmem-warning', '--no-default-keyring', '--fixed-list-mode', '--with-colons');
my @keyid = split("\n", $keyid);
@keyid = grep {s/^pub:[^:]*:[^:]*:[^:]*:([^:]*):.*$/$1/} @keyid;
if (@keyid != 1) {
remove_tree($tdir) || die "Could not remove $tdir: $!\n";
die("keyid not found\n");
}
$keyid = $keyid[0];
# add user sig to pubkey
$ENV{GNUPGHOME} = $org_gnupghome;
my $pubring;
if (-e "$tdir/gnupg/pubring.kbx") {
$pubring = "$tdir/gnupg/pubring.kbx";
} elsif ( -e "$tdir/gnupg/pubring.gpg") {
$pubring = "$tdir/gnupg/pubring.gpg";
} else {
remove_tree($tdir);
die "No valid pubring found in $tdir/gnupg\n";
}
rungpg_fatal("$phrases/$user", $tdir, $gpg, '--batch', '--no-secmem-warning',
@pinentrymode,
"--passphrase-fd=0", "--yes",
"-u", $user,
'--default-cert-level', '3',
"--keyring", $pubring,
'--edit-key', $keyid,
'sign',
'save');
# export pubkey
$ENV{GNUPGHOME} = "$tdir/gnupg";
my $pubkey = rungpg_fatal('/dev/null', $tdir, $gpg, '--batch', '--no-secmem-warning', '--no-default-keyring', '--export', '-a');
# encrypt privkey
my $privkey_plain = rungpg_fatal('/dev/null', $tdir, $gpg, '--batch', '--export-secret-keys', '--no-verbose', '--no-secmem-warning', '--trust-model', 'always');
# newer gpg versions also export the userid and signature, so strip to the bare key
$privkey_plain = striptofirst($privkey_plain);
open(F, '>', "$tdir/privkey") || die("$tdir/privkey: $!\n");
(syswrite(F, $privkey_plain) || 0) == length($privkey_plain) || die("privkey write error\n");
close(F) || die("privkey close error\n");
$ENV{GNUPGHOME} = $org_gnupghome;
my $privkey = rungpg_fatal('/dev/null', $tdir, $gpg, '--batch', '--encrypt', '--no-verbose', '--no-secmem-warning', '--trust-model', 'always', '-o-', '-r', "$user", "$tdir/privkey");
remove_tree($tdir);
# send back
$privkey = unpack('H*', $privkey);
return (0, '', $pubkey, $privkey);
}
sub cmd_certgen {
my ($cmd, $user, $hashalgo, @args) = @_;
die("keygen: at least five arguments expected\n") if @args < 4;
die("bad private key\n") if $args[0] !~ /^(?:[0-9a-fA-F][0-9a-fA-F])+$/s;
my $privkey = pack('H*', $args[0]);
my $expire = $args[1];
die("bad expire format\n") unless $expire =~ /^\d{1,10}$/s;
my $real = $args[2];
my $email = $args[3];
checkbadchar($real, 'real name');
checkbadchar($email, 'email');
local *F;
open(F, ">$tmpdir/privkey.$$") || die("$tmpdir/privkey.$$: $!\n");
(syswrite(F, $privkey) || 0) == length($privkey) || die("encoded privkey write error\n");
close(F) || die("encoded privkey close error\n");
$privkey = rungpg_fatal("$phrases/$user", ["$tmpdir/privkey.$$"], $gpg, '--batch', '--decrypt', '--no-verbose', '-q', '--no-secmem-warning', @pinentrymode, '--passphrase-fd=0', "$tmpdir/privkey.$$");
unlink("$tmpdir/privkey.$$");
my $opensslprivkey = priv2openssl($privkey);
my $reqconf = <<"EOL";
[ req ]
string_mask = utf8only
distinguished_name = distinguished_name
x509_extensions = x509_extensions
prompt = no
utf8 = yes
[ distinguished_name ]
CN = "$real"
emailAddress = "$email"
[ x509_extensions ]
basicConstraints = critical,CA:false
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid,issuer
keyUsage = critical,keyCertSign,digitalSignature
extendedKeyUsage = codeSigning
EOL
open(F, ">$tmpdir/sslreq$$.conf") || die("$tmpdir/sslreq$$.conf: $!\n");
(syswrite(F, $reqconf) || 0) == length($reqconf) || die("openssl conf write error\n");
close(F) || die("openssl conf close error\n");
open(F, ">$tmpdir/privkey.$$") || die("$tmpdir/privkey.$$: $!\n");
(syswrite(F, $opensslprivkey) || 0) == length($opensslprivkey) || die("openssl privkey write error\n");
close(F) || die("openssl privkey close error\n");
my $cert = rungpg_fatal('/dev/null', ["$tmpdir/sslreq$$.conf", "$tmpdir/privkey.$$"], $openssl, 'req', '-new', '-x509', '-sha256', '-key', "$tmpdir/privkey.$$", '-days', $expire, '-config', "$tmpdir/sslreq$$.conf");
unlink("$tmpdir/privkey.$$");
unlink("$tmpdir/sslreq$$.conf");
$oldproto = 1; # FIXME: should not force the old proto here
return (0, '', $cert);
}
sub cmd_pubkey {
my ($cmd, $user, $hashalgo, @args) = @_;
die("pubkey: one argument expected\n") if @args;
my $pubkey = rungpg_fatal('/dev/null', undef, $gpg, '--export', '-a', $user);
return (0, '', $pubkey);
}
sub cmd_privsign {
my ($cmd, $user, $hashalgo, @args) = @_;
die("privsign: at least three arguments expected\n") if @args < 2;
die("bad private key\n") if $args[0] !~ /^(?:[0-9a-fA-F][0-9a-fA-F])+$/s;
my $privkey = pack('H*', $args[0]);
shift @args;
local *F;
open(F, ">$tmpdir/privkey.$$") || die("$tmpdir/privkey.$$: $!\n");
(syswrite(F, $privkey) || 0) == length($privkey) || die("encoded privkey write error\n");
close(F) || die("encoded privkey close error\n");
$privkey = rungpg_fatal("$phrases/$user", ["$tmpdir/privkey.$$"], $gpg, '--batch', '--decrypt', '--no-verbose', '-q', '--no-secmem-warning', @pinentrymode, '--passphrase-fd=0', "$tmpdir/privkey.$$");
unlink("$tmpdir/privkey.$$");
my @infos;
my $pubkey = priv2pub($privkey, $have_gcrypt ? \@infos : undef);
if ($have_gcrypt && @infos == 1 && $infos[0]->{'algo'} == 1 && $infos[0]->{'smpis'}) {
my $info = $infos[0];
my $status = 0;
my $err = '';
my @out;
while (@args) {
my $lout = '';
my $classtime;
if ($patchclasstime && ($args[0] =~ /\@([0-9a-fA-F]{10})$/s)) {
$classtime = $1;
$args[0] = substr($args[0], 0, -10)."0000000000";
}
eval { $lout = sign_with_gcrypt($info, $args[0], $hashalgo) };
if ($@) {
$err .= $@;
$status = 1;
}
$lout = patchclasstime($lout, $classtime) if $classtime && !$status;
shift @args;
push @out, $lout;
last if $status;
}
return ($status, $err, @out);
}
# create import data: pubkey pkg, user pkg, privkey pkg, user pkg
$privkey = priv2pub($privkey).encodetag(13, 'privsign').striptofirst($privkey).encodetag(13, 'privsign');
open(F, ">$tmpdir/privkey.$$") || die("$tmpdir/privkey.$$: $!\n");
(syswrite(F, $privkey) || 0) == length($privkey) || die("decoded privkey write error\n");
close(F) || die("decoded privkey close error\n");
my $tdir;
my $oldgpghome = $ENV{GNUPGHOME};
($tdir, $ENV{GNUPGHOME}) = prepare_tmp_gnupghome($tmpdir);
rungpg_fatal("$phrases/$user", ["$tmpdir/privkey.$$"], $gpg, '--batch', '--no-verbose', '-q', '--no-secmem-warning', '--allow-non-selfsigned-uid', @pinentrymode, '--passphrase-fd=0', '--import', "$tmpdir/privkey.$$");
unlink("$tmpdir/privkey.$$");
my $status = 0;
my $err = '';
my @out;
while (@args) {
my ($lout, $lerr);
my $classtime;
if ($patchclasstime && ($args[0] =~ /\@([0-9a-fA-F]{10})$/s)) {
$classtime = $1;
$args[0] = substr($args[0], 0, -10)."0000000000";
}
($status, $lout, $lerr) = rungpg('/dev/null', undef, $gpg, "--batch", "--force-v3-sigs", "--files-are-digests", "--allow-non-selfsigned-uid", "--digest-algo=$hashalgo", "--no-verbose", "--no-armor", "--no-secmem-warning", "--ignore-time-conflict", @pinentrymode, "--passphrase-fd=0", "-sbo", "-", $args[0]);
$lout = patchclasstime($lout, $classtime) if $classtime && !$status;
shift @args;
push @out, $lout;
$err .= $lerr;