1 # Monkeysphere Validation Agent, Perl version
2 # Copyright © 2010 Daniel Kahn Gillmor <dkg@fifthhorseman.net>,
3 # Jameson Rollins <jrollins@finestructure.net>
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 { package Crypt::Monkeysphere::MSVA;
22 use vars qw($VERSION);
24 use parent qw(HTTP::Server::Simple::CGI);
26 use Crypt::Monkeysphere::Validator;
29 use Regexp::Common qw /net/;
37 use Crypt::Monkeysphere::MSVA::MarginalUI;
38 use Crypt::Monkeysphere::Logger;
39 use Crypt::Monkeysphere::Util qw(untaint);
40 use Crypt::Monkeysphere::MSVA::Monitor;
41 use Crypt::Monkeysphere::OpenPGP;
44 use POSIX qw(strftime);
45 # we need the version of GnuPG::Interface that knows about pubkey_data, etc:
46 use GnuPG::Interface 0.43;
50 my $gnupg = GnuPG::Interface::->new();
51 $gnupg->options->quiet(1);
52 $gnupg->options->batch(1);
55 '/' => { handler => \&noop,
56 methods => { 'GET' => 1 },
58 '/reviewcert' => { handler => \&reviewcert,
59 methods => { 'POST' => 1 },
61 '/extracerts' => { handler => \&extracerts,
62 methods => { 'POST' => 1 },
66 my $default_keyserver_policy = 'unlessvalid';
68 my $logger = Crypt::Monkeysphere::Logger->new($ENV{MSVA_LOG_LEVEL});
74 return 'Net::Server::MSVA';
78 return $logger->log(@_);
85 if (exists $ENV{MSVA_PORT} and $ENV{MSVA_PORT} ne '') {
86 msvalog('debug', "MSVA_PORT set to %s\n", $ENV{MSVA_PORT});
87 $port = $ENV{MSVA_PORT} + 0;
88 die sprintf("not a reasonable port %d", $port) if (($port >= 65536) || $port <= 0);
90 # start the server on requested port
91 my $self = $class->SUPER::new($port);
92 if (! exists $ENV{MSVA_PORT}) {
93 # we can't pass port 0 to the constructor because it evaluates
94 # to false, so HTTP::Server::Simple just uses its internal
95 # default of 8080. But if we want to select an arbitrary open
96 # port, we *can* set it here.
100 $self->{allowed_uids} = {};
101 if (exists $ENV{MSVA_ALLOWED_USERS} and $ENV{MSVA_ALLOWED_USERS} ne '') {
102 msvalog('verbose', "MSVA_ALLOWED_USERS environment variable is set.\nLimiting access to specified users.\n");
103 foreach my $user (split(/ +/, $ENV{MSVA_ALLOWED_USERS})) {
104 my ($name, $passwd, $uid);
105 if ($user =~ /^[0-9]+$/) {
106 $uid = $user + 0; # force to integer
108 ($name,$passwd,$uid) = getpwnam($user);
111 msvalog('verbose', "Allowing access from user ID %d\n", $uid);
112 $self->{allowed_uids}->{$uid} = $user;
114 msvalog('error', "Could not find user '%d'; not allowing\n", $user);
118 # default is to allow access only to the current user
119 $self->{allowed_uids}->{POSIX::getuid()} = 'self';
122 bless ($self, $class);
129 return '200 OK', { available => JSON::true,
134 # return an arrayref of processes which we can detect that have the
135 # given socket open (the socket is specified with its inode)
136 sub getpidswithsocketinode {
139 if (! defined ($sockid)) {
140 msvalog('verbose', "No client socket ID to check. The MSVA is probably not running as a service.\n");
143 # this appears to be how Linux symlinks open sockets in /proc/*/fd,
144 # as of at least 2.6.26:
145 my $socktarget = sprintf('socket:[%d]', $sockid);
149 if (opendir($procfs, '/proc')) {
150 foreach my $pid (grep { /^\d+$/ } readdir($procfs)) {
151 my $procdir = sprintf('/proc/%d', $pid);
154 if (opendir($procfds, sprintf('/proc/%d/fd', $pid))) {
155 foreach my $procfd (grep { /^\d+$/ } readdir($procfds)) {
156 my $fd = sprintf('/proc/%d/fd/%d', $pid, $procfd);
158 #my ($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($fd);
159 my $targ = readlink($fd);
161 if ($targ eq $socktarget);
171 # FIXME: this whole business is very linux-specific, i think. i
172 # wonder how to get this info in other OSes?
177 # return {uid => X, inode => Y}, meaning the numeric ID of the peer
178 # on the other end of $socket, "socket inode" identifying the peer's
179 # open network socket. each value could be undef if unknown.
180 sub get_client_info {
183 my $sock = IO::Socket::->new_from_fd($socket, 'r');
184 # check SO_PEERCRED -- if this was a TCP socket, Linux
185 # might not be able to support SO_PEERCRED (even on the loopback),
186 # though apparently some kernels (Solaris?) are able to.
189 my $remotesocketinode;
190 my $socktype = $sock->sockopt(SO_TYPE) or die "could not get SO_TYPE info";
191 if (defined $socktype) {
192 msvalog('debug', "sockopt(SO_TYPE) = %d\n", $socktype);
194 msvalog('verbose', "sockopt(SO_TYPE) returned undefined.\n");
197 my $peercred = $sock->sockopt(SO_PEERCRED) or die "could not get SO_PEERCRED info";
198 my $client = $sock->peername();
199 my $family = sockaddr_family($client); # should be AF_UNIX (a.k.a. AF_LOCAL) or AF_INET
201 msvalog('verbose', "socket family: %d\nsocket type: %d\n", $family, $socktype);
204 # FIXME: on i386 linux, this appears to be three ints, according to
205 # /usr/include/linux/socket.h. What about other platforms?
206 my ($pid, $uid, $gid) = unpack('iii', $peercred);
208 msvalog('verbose', "SO_PEERCRED: pid: %u, uid: %u, gid: %u\n",
211 if ($pid != 0 && $uid != 0) { # then we can accept it:
214 # FIXME: can we get the socket inode as well this way?
217 # another option in Linux would be to parse the contents of
218 # /proc/net/tcp to find the uid of the peer process based on that
220 if (! defined $clientid) {
221 msvalog('verbose', "SO_PEERCRED failed, digging around in /proc/net/tcp\n");
223 if ($family == AF_INET) {
225 } elsif ($family == AF_INET6) {
228 if (defined $proto) {
229 if ($socktype == &SOCK_STREAM) {
230 $proto = 'tcp'.$proto;
231 } elsif ($socktype == &SOCK_DGRAM) {
232 $proto = 'udp'.$proto;
236 if (defined $proto) {
237 my ($port, $iaddr) = unpack_sockaddr_in($client);
238 my $iaddrstring = unpack("H*", reverse($iaddr));
239 msvalog('verbose', "Port: %04x\nAddr: %s\n", $port, $iaddrstring);
240 my $remmatch = lc(sprintf("%s:%04x", $iaddrstring, $port));
241 my $infofile = '/proc/net/'.$proto;
242 my $f = IO::File::->new();
243 if ( $f->open('< '.$infofile)) {
244 my @header = split(/ +/, <$f>);
245 my ($localaddrix, $uidix, $inodeix);
248 while ($ix <= $#header) {
249 $localaddrix = $ix - $skipcount if (lc($header[$ix]) eq 'local_address');
250 $uidix = $ix - $skipcount if (lc($header[$ix]) eq 'uid');
251 $inodeix = $ix - $skipcount if (lc($header[$ix]) eq 'inode');
252 $skipcount++ if (lc($header[$ix]) eq 'tx_queue') or (lc($header[$ix]) eq 'tr'); # these headers don't actually result in a new column during the data rows
255 if (!defined $localaddrix) {
256 msvalog('info', "Could not find local_address field in %s; unable to determine peer UID\n",
258 } elsif (!defined $uidix) {
259 msvalog('info', "Could not find uid field in %s; unable to determine peer UID\n",
261 } elsif (!defined $inodeix) {
262 msvalog('info', "Could not find inode field in %s; unable to determine peer network socket inode\n",
265 msvalog('debug', "local_address: %d; uid: %d\n", $localaddrix,$uidix);
266 while (my @line = split(/ +/,<$f>)) {
267 if (lc($line[$localaddrix]) eq $remmatch) {
268 if (defined $clientid) {
269 msvalog('error', "Warning! found more than one remote uid! (%s and %s\n", $clientid, $line[$uidix]);
271 $clientid = $line[$uidix];
272 $remotesocketinode = $line[$inodeix];
273 msvalog('info', "remote peer is uid %d (inode %d)\n",
274 $clientid, $remotesocketinode);
278 msvalog('error', "Warning! could not find peer information in %s. Not verifying.\n", $infofile) unless defined $clientid;
280 } else { # FIXME: we couldn't read the file. what should we
281 # do besides warning?
282 msvalog('info', "Could not read %s; unable to determine peer UID\n",
288 return { 'uid' => $clientid,
289 'inode' => $remotesocketinode };
296 # This is part of a spawned child process. We don't want the
297 # child process to destroy the update monitor when it terminates.
298 $self->{updatemonitor}->forget();
299 my $clientinfo = get_client_info(select);
300 my $clientuid = $clientinfo->{uid};
302 if (defined $clientuid) {
303 # test that this is an allowed user:
304 if (exists $self->{allowed_uids}->{$clientuid}) {
305 msvalog('verbose', "Allowing access from uid %d (%s)\n", $clientuid, $self->{allowed_uids}->{$clientuid});
307 msvalog('error', "MSVA client connection from uid %d, forbidden.\n", $clientuid);
308 printf("HTTP/1.0 403 Forbidden -- peer does not match local user ID\r\nContent-Type: text/plain\r\nDate: %s\r\n\r\nHTTP/1.1 403 Not Found -- peer does not match the local user ID. Are you sure the agent is running as the same user?\r\n",
309 strftime("%a, %d %b %Y %H:%M:%S %z", localtime(time())),);
314 my $path = $cgi->path_info();
315 my $handler = $dispatch{$path};
317 if (ref($handler) eq "HASH") {
318 if (! exists $handler->{methods}->{$cgi->request_method()}) {
319 printf("HTTP/1.0 405 Method not allowed\r\nAllow: %s\r\nDate: %s\r\n",
320 join(', ', keys(%{$handler->{methods}})),
321 strftime("%a, %d %b %Y %H:%M:%S %z", localtime(time())));
322 } elsif (ref($handler->{handler}) ne "CODE") {
323 printf("HTTP/1.0 500 Server Error\r\nDate: %s\r\n",
324 strftime("%a, %d %b %Y %H:%M:%S %z", localtime(time())));
327 my $ctype = $cgi->content_type();
328 msvalog('verbose', "Got %s %s (Content-Type: %s)\n", $cgi->request_method(), $path, defined $ctype ? $ctype : '**none supplied**');
329 if (defined $ctype) {
330 my @ctypes = split(/; */, $ctype);
331 $ctype = shift @ctypes;
332 if ($ctype eq 'application/json') {
333 $data = from_json($cgi->param('POSTDATA'));
337 my ($status, $object) = $handler->{handler}($data, $clientinfo);
338 if (ref($object) eq 'HASH' &&
339 ! defined $object->{server}) {
340 $object->{server} = sprintf("MSVA-Perl %s", $VERSION);
343 my $ret = to_json($object);
344 msvalog('info', "returning: %s\n", $ret);
345 printf("HTTP/1.0 %s\r\nDate: %s\r\nContent-Type: application/json\r\n\r\n%s",
347 strftime("%a, %d %b %Y %H:%M:%S %z", localtime(time())),
351 printf("HTTP/1.0 404 Not Found -- not handled by Monkeysphere validation agent\r\nContent-Type: text/plain\r\nDate: %s\r\n\r\nHTTP/1.0 404 Not Found -- the path:\r\n %s\r\nis not handled by the MonkeySphere validation agent.\r\nPlease try one of the following paths instead:\r\n\r\n%s\r\n",
352 strftime("%a, %d %b %Y %H:%M:%S %z", localtime(time())),
353 $path, ' * '.join("\r\n * ", keys %dispatch) );
357 sub get_keyserver_policy {
358 if (exists $ENV{MSVA_KEYSERVER_POLICY} and $ENV{MSVA_KEYSERVER_POLICY} ne '') {
359 if ($ENV{MSVA_KEYSERVER_POLICY} =~ /^(always|never|unlessvalid)$/) {
362 msvalog('error', "Not a valid MSVA_KEYSERVER_POLICY):\n %s\n", $ENV{MSVA_KEYSERVER_POLICY});
364 return $default_keyserver_policy;
368 # We should read from (first hit wins):
370 if (exists $ENV{MSVA_KEYSERVER} and $ENV{MSVA_KEYSERVER} ne '') {
371 if ($ENV{MSVA_KEYSERVER} =~ /^(((hkps?|hkpms|finger|ldap):\/\/)?$RE{net}{domain})$/) {
374 msvalog('error', "Not a valid keyserver (from MSVA_KEYSERVER):\n %s\n", $ENV{MSVA_KEYSERVER});
377 # FIXME: some msva.conf or monkeysphere.conf file (system and user?)
379 # let the keyserver routines choose.
384 ##################################################
385 ## PKC KEY EXTRACTION ############################
391 if (lc($data->{pkc}->{type}) eq 'x509der') {
392 $key = der2key(join('', map(chr, @{$data->{pkc}->{data}})));
393 } elsif (lc($data->{pkc}->{type}) eq 'x509pem') {
394 $key = der2key(pem2der($data->{pkc}->{data}));
395 } elsif (lc($data->{pkc}->{type}) eq 'opensshpubkey') {
396 $key = opensshpubkey2key($data->{pkc}->{data});
397 } elsif (lc($data->{pkc}->{type}) eq 'rfc4716') {
398 $key = rfc47162key($data->{pkc}->{data});
400 $key->{error} = sprintf("Don't know this public key carrier type: %s", $data->{pkc}->{type});
403 if (exists $key->{error}) {
407 # make sure that the returned integers are Math::BigInts:
408 $key->{exponent} = Math::BigInt::->new($key->{exponent}) unless (ref($key->{exponent}));
409 $key->{modulus} = Math::BigInt::->new($key->{modulus}) unless (ref($key->{modulus}));
410 msvalog('debug', "pubkey info:\nmodulus: %s\nexponent: %s\n",
411 $key->{modulus}->as_hex(),
412 $key->{exponent}->as_hex(),
415 if ($key->{modulus}->copy()->blog(2) < 1000) {
416 $key->{error} = sprintf('Public key size is less than 1000 bits (was: %d bits)', $key->{modulus}->copy()->blog(2));
425 my $cert = Crypt::X509::->new(cert => $rawdata);
427 my $key = {error => 'I do not know what happened here'};
430 $key->{error} = sprintf("Error decoding X.509 certificate: %s", $cert->error);
432 msvalog('verbose', "cert subject: %s\n", $cert->subject_cn());
433 msvalog('verbose', "cert issuer: %s\n", (defined $cert->issuer_cn() ? $cert->issuer_cn() : '<none>'));
434 msvalog('verbose', "cert pubkey algo: %s\n", $cert->PubKeyAlg());
435 msvalog('verbose', "cert pubkey: %s\n", unpack('H*', $cert->pubkey()));
437 if ($cert->PubKeyAlg() ne 'RSA') {
438 $key->{error} = sprintf('public key was algo "%s" (OID %s). MSVA.pl only supports RSA',
439 $cert->PubKeyAlg(), $cert->pubkey_algorithm);
441 msvalog('debug', "decoding ASN.1 pubkey\n");
442 $key = $cert->pubkey_components();
443 if (! defined $key) {
444 msvalog('verbose', "failed to decode %s\n", unpack('H*', $cert->pubkey()));
445 $key = {error => 'failed to decode the public key'};
447 # ensure these are Math::BigInts!
448 $key->{exponent} = Math::BigInt::->new($key->{exponent}) unless (ref($key->{exponent}));
449 $key->{modulus} = Math::BigInt::->new($key->{modulus}) unless (ref($key->{modulus}));
451 my $pgpext = $cert->PGPExtension();
452 if (defined $pgpext) {
453 $key->{openpgp4fpr} = Crypt::Monkeysphere::OpenPGP::fingerprint($key, $pgpext);
454 msvalog('verbose', "OpenPGP Fingerprint (derived from X.509 cert): 0x%s\n", uc(unpack("H*", $key->{openpgp4fpr})));
464 my @lines = split(/\n/, $pem);
467 foreach my $line (@lines) {
468 if ($line eq '-----END CERTIFICATE-----') {
471 push @goodlines, $line;
472 } elsif ($line eq '-----BEGIN CERTIFICATE-----') {
476 msvalog('debug', "%d lines of base64:\n%s\n", $#goodlines + 1, join("\n", @goodlines));
477 return decode_base64(join('', @goodlines));
480 sub opensshpubkey2key {
482 # FIXME: do we care that the label matches the type of key?
483 my ($label, $prop) = split(/ +/, $data);
485 my $out = parse_rfc4716body($prop);
494 my $continuation = '';
495 my $state = 'outside';
496 foreach my $line (split(/\n/, $data)) {
497 last if ($state eq 'body' && $line eq '---- END SSH2 PUBLIC KEY ----');
498 if ($state eq 'outside' && $line eq '---- BEGIN SSH2 PUBLIC KEY ----') {
502 if ($state eq 'header') {
503 $line = $continuation.$line;
505 if ($line =~ /^(.*)\\$/) {
509 if (! ($line =~ /:/)) {
513 push(@goodlines, $line) if ($state eq 'body');
516 msvalog('debug', "Found %d lines of RFC4716 body:\n%s\n",
518 join("\n", @goodlines));
519 my $out = parse_rfc4716body(join('', @goodlines));
524 sub parse_rfc4716body {
528 unless defined($data);
529 $data = decode_base64($data) or return undef;
531 msvalog('debug', "key properties: %s\n", unpack('H*', $data));
533 while (length($data) > 4) {
534 my $size = unpack('N', substr($data, 0, 4));
535 msvalog('debug', "size: 0x%08x\n", $size);
536 return undef if (length($data) < $size + 4);
537 push(@{$out}, substr($data, 4, $size));
538 $data = substr($data, 4 + $size);
541 if ($out->[0] ne "ssh-rsa") {
542 return {error => 'Not an RSA key'};
545 if (scalar(@{$out}) != 3) {
546 return {error => 'Does not contain the right number of bigints for RSA'};
549 return { exponent => Math::BigInt->from_hex('0x'.unpack('H*', $out->[1])),
550 modulus => Math::BigInt->from_hex('0x'.unpack('H*', $out->[2])),
554 ## PKC KEY EXTRACTION ############################
555 ##################################################
559 my $clientinfo = shift;
560 return if !ref $data;
562 msvalog('verbose', "reviewing data...\n");
564 my $status = '200 OK';
565 my $ret = { valid => JSON::false,
566 message => 'Unknown failure',
569 # check that there actually is key data
570 if ($data->{pkc}->{data} eq '') {
571 $ret->{message} = sprintf("Key data empty.");
575 # check context string
576 if ($data->{context} =~ /^(https|ssh|smtp|ike|postgresql|imaps|imap|submission|e-mail)$/) {
577 $data->{context} = $1;
579 msvalog('error', "invalid context: %s\n", $data->{context});
580 $ret->{message} = sprintf("Invalid/unknown context: %s", $data->{context});
583 msvalog('verbose', "context: %s\n", $data->{context});
585 # checkout peer string
586 # old-style just passed a string as a peer, rather than
587 # peer: { name: 'whatever', 'type': 'client' }
588 $data->{peer} = { name => $data->{peer} }
589 if (ref($data->{peer}) ne 'HASH');
591 if (defined($data->{peer}->{type})) {
592 if ($data->{peer}->{type} =~ /^(client|server|peer)$/) {
593 $data->{peer}->{type} = $1;
595 msvalog('error', "invalid peer type string: %s\n", $data->{peer}->{type});
596 $ret->{message} = sprintf("Invalid peer type string: %s", $data->{peer}->{type});
601 my $prefix = $data->{context}.'://';
602 if ($data->{context} eq 'e-mail' ||
603 (defined $data->{peer}->{type} &&
604 $data->{peer}->{type} eq 'client' &&
605 # ike and smtp clients are effectively other servers, so we'll
607 $data->{context} !~ /^(ike|smtp)$/)) {
609 # clients can have any one-line User ID without NULL characters
610 # and leading or trailing whitespace
611 if ($data->{peer}->{name} =~ /^([^[:space:]][^\n\0]*[^[:space:]]|[^\0[:space:]])$/) {
612 $data->{peer}->{name} = $1;
614 msvalog('error', "invalid client peer name string: %s\n", $data->{peer}->{name});
615 $ret->{message} = sprintf("Invalid client peer name string: %s", $data->{peer}->{name});
618 } elsif ($data->{peer}->{name} =~ /^($RE{net}{domain}(:[[:digit:]]+)?)$/) {
619 $data->{peer}->{name} = $1;
621 msvalog('error', "invalid peer name string: %s\n", $data->{peer}->{name});
622 $ret->{message} = sprintf("Invalid peer name string: %s", $data->{peer}->{name});
626 msvalog('verbose', "peer: %s\n", $data->{peer}->{name});
628 # generate uid string
629 my $uid = $prefix.$data->{peer}->{name};
630 msvalog('verbose', "user ID: %s\n", $uid);
632 # extract key or openpgp fingerprint from PKC
635 if (lc($data->{pkc}->{type}) eq 'openpgp4fpr') {
636 if ($data->{pkc}->{data} =~ /^(0x)?([[:xdigit:]]{40})$/) {
637 $data->{pkc}->{data} = uc($2);
638 $fpr = $data->{pkc}->{data};
640 msvalog('error', "invalid OpenPGP v4 fingerprint: %s\n",$data->{pkc}->{data});
641 $ret->{message} = sprintf("Invalid OpenPGP v4 fingerprint.");
645 # extract key from PKC
646 $key = pkcextractkey($data);
647 if (exists $key->{error}) {
648 $ret->{message} = $key->{error};
651 $fpr = uc(unpack('H*', $key->{openpgp4fpr}))
652 if (exists $key->{openpgp4fpr});
654 msvalog('verbose', "OpenPGP v4 fingerprint: %s\n",$fpr)
657 # determine keyserver policy
659 if (defined $data->{keyserverpolicy} &&
660 $data->{keyserverpolicy} =~ /^(always|never|unlessvalid)$/) {
662 msvalog("verbose", "using requested keyserver policy: %s\n", $1);
664 $kspolicy = get_keyserver_policy();
666 msvalog('debug', "keyserver policy: %s\n", $kspolicy);
667 # needed because $gnupg spawns child processes
668 $ENV{PATH} = '/usr/local/bin:/usr/bin:/bin';
670 $ret->{message} = sprintf('Failed to validate "%s" through the OpenPGP Web of Trust.', $uid);
672 my $validator=new Crypt::Monkeysphere::Validator(kspolicy=>$kspolicy,
673 context=>$data->{context},
674 keyserver=>get_keyserver(),
678 my $uid_query=$validator->lookup(uid=>$uid,fpr=>$fpr,key=>$key);
680 # only show the marginal UI if the UID of the corresponding
681 # key is not fully valid.
682 if (defined($uid_query->{valid_key})) {
683 $ret->{valid} = JSON::true;
684 $ret->{message} = sprintf('Successfully validated "%s" through the OpenPGP Web of Trust.', $uid);
686 my $resp = Crypt::Monkeysphere::MSVA::MarginalUI->ask_the_user($gnupg,
688 $uid_query->{subvalid_keys},
689 getpidswithsocketinode($clientinfo->{inode}),
691 msvalog('info', "response: %s\n", $resp);
693 $ret->{valid} = JSON::true;
694 $ret->{message} = sprintf('Manually validated "%s" through the OpenPGP Web of Trust.', $uid);
705 $self->spawn_master_subproc($server);
708 sub master_subprocess_died {
711 my $subproc_return = shift;
713 my $exitstatus = POSIX::WEXITSTATUS($subproc_return);
714 msvalog('verbose', "Subprocess %d terminated; exiting %d.\n", $self->{child_pid}, $exitstatus);
715 $server->set_exit_status($exitstatus);
716 $server->server_close();
724 msvalog('debug', "Subprocess %d terminated.\n", $pid);
726 if (exists $self->{updatemonitor} &&
727 defined $self->{updatemonitor}->getchildpid() &&
728 $self->{updatemonitor}->getchildpid() == $pid) {
729 my $exitstatus = POSIX::WEXITSTATUS($?);
730 msvalog('verbose', "Update monitoring process (%d) terminated with code %d.\n", $pid, $exitstatus);
731 if (0 == $exitstatus) {
732 msvalog('info', "Reloading MSVA due to update request.\n");
733 # sending self a SIGHUP:
736 msvalog('error', "Update monitoring process (%d) died unexpectedly with code %d.\nNo longer monitoring for updates; please send HUP manually.\n", $pid, $exitstatus);
737 # it died for some other weird reason; should we respawn it?
739 # FIXME: i'm worried that re-spawning would create a
740 # potentially abusive loop, if there are legit, repeatable
741 # reasons for the failure.
743 # $self->{updatemonitor}->spawn();
745 # instead, we'll just avoid trying to kill the next process with this PID:
746 $self->{updatemonitor}->forget();
748 } elsif (exists $self->{child_pid} &&
749 ($self->{child_pid} == 0 ||
750 $self->{child_pid} == $pid)) {
751 $self->master_subprocess_died($server, $?);
759 $server->{server}->{leave_children_open_on_hup} = 1;
761 my $socketcount = @{ $server->{server}->{sock} };
762 if ( $socketcount != 1 ) {
763 msvalog('error', "%d sockets open; should have been 1.\n", $socketcount);
764 $server->set_exit_status(10);
765 $server->server_close();
767 if (!defined($self->port) || $self->port == 0) {
768 my $port = @{ $server->{server}->{sock} }[0]->sockport();
769 if ((! defined($port)) || ($port < 1) || ($port >= 65536)) {
770 msvalog('error', "got nonsense port: %d.\n", $port);
771 $server->set_exit_status(11);
772 $server->server_close();
774 if ((exists $ENV{MSVA_PORT}) && (($ENV{MSVA_PORT} + 0) != $port)) {
775 msvalog('error', "Explicitly requested port %d, but got port: %d.", ($ENV{MSVA_PORT}+0), $port);
776 $server->set_exit_status(13);
777 $server->server_close();
781 $self->{updatemonitor} = Crypt::Monkeysphere::MSVA::Monitor::->new($logger);
784 sub spawn_master_subproc {
788 if ((exists $ENV{MSVA_CHILD_PID}) && ($ENV{MSVA_CHILD_PID} ne '')) {
789 # this is most likely a re-exec.
790 msvalog('info', "This appears to be a re-exec, continuing with child pid %d\n", $ENV{MSVA_CHILD_PID});
791 $self->{child_pid} = $ENV{MSVA_CHILD_PID} + 0;
792 } elsif ($#ARGV >= 0) {
793 $self->{child_pid} = 0; # indicate that we are planning to fork.
794 # avoid ignoring SIGCHLD right before we fork.
797 while (defined($val = POSIX::waitpid(-1, POSIX::WNOHANG)) && $val > 0) {
798 $self->child_dies($val, $server);
802 if (! defined $fork) {
803 msvalog('error', "could not fork\n");
806 msvalog('debug', "Child process has PID %d\n", $fork);
807 $self->{child_pid} = $fork;
808 $ENV{MSVA_CHILD_PID} = $fork;
810 msvalog('verbose', "PID %d executing: \n", $$);
811 for my $arg (@ARGV) {
812 msvalog('verbose', " %s\n", $arg);
814 # untaint the environment for the subprocess
815 # see: https://labs.riseup.net/code/issues/2461
816 foreach my $e (keys %ENV) {
817 $ENV{$e} = untaint($ENV{$e});
821 push @args, untaint($_);
823 # restore default SIGCHLD handling:
824 $SIG{CHLD} = 'DEFAULT';
825 $ENV{MONKEYSPHERE_VALIDATION_AGENT_SOCKET} = sprintf('http://localhost:%d', $self->port);
826 exec(@args) or exit 111;
830 printf("MONKEYSPHERE_VALIDATION_AGENT_SOCKET=http://localhost:%d;\nexport MONKEYSPHERE_VALIDATION_AGENT_SOCKET;\n", $self->port);
831 # FIXME: consider daemonizing here to behave more like
832 # ssh-agent. maybe avoid backgrounding by setting
833 # MSVA_NO_BACKGROUND.
840 return '500 not yet implemented', { };