/usr/lib/gnupg/gpgkeys_hkpms is in msva-perl 0.9.2-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# hkpms transport -- HKP-over-TLS, authenticated by monkeysphere
use strict;
use warnings;
# Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
# Copyright: 2010
# License: GPL v3+
# (you should have received a COPYING file with this distribution)
{ package Crypt::Monkeysphere::MSVA::HKPMS;
use POSIX;
use Crypt::Monkeysphere::Logger;
use Crypt::Monkeysphere::MSVA::Client;
use Regexp::Common qw /net/;
use Module::Load::Conditional;
sub parse_input {
my $self = shift;
my $input = shift;
my $inheaders = 1;
foreach my $line (split(/\n/, $input)) {
if ($inheaders) {
if ($line eq '') {
$inheaders = 0;
} else {
next if ($line =~ /^#/);
my @args = split(/ /, $line);
my $cmd = shift @args;
$self->{config}->{lc($cmd)} = join(' ', @args);
if (lc($cmd) eq 'option') {
my $opt = lc($args[0]);
if ($opt eq 'debug') {
$self->{logger}->set_log_level('debug');
} elsif ($opt eq 'verbose') {
$self->{logger}->more_verbose();
} elsif ($opt eq 'no-check-cert') {
$self->{logger}->log('error', "Received no-check-cert option. Why are you bothering with hkpms if you aren't checking?\n");
$self->{actually_check} = 0;
} elsif ($opt eq 'check-cert') {
$self->{actually_check} = 1;
} elsif ($opt =~ /^http-proxy=(.*)/) {
my $hp = $1;
if ($hp =~ /^(socks|http|https):\/\/($RE{net}{domain}|$RE{net}{IPv4}):([[:digit:]]+)\/?$/) {
if ('socks' eq $1) {
if ( ! Module::Load::Conditional::check_install(module => 'LWP::Protocol::socks')) {
$self->{logger}->log('error', "Requesting a socks proxy for hkpms, but LWP::Protocol::socks is not installed.\nThis will likely fail.\n");
}
}
$self->{proxy} = sprintf('%s://%s:%s', $1, $2, $3);
} else {
$self->{logger}->log('error', "Failed to make sense of this http-proxy address: '%s'; ignoring.\n", $hp);
}
} else {
$self->{logger}->log('error', "Received '%s' as an option, but gpgkeys_hkpms does not implement it. Ignoring...\n", $opt);
}
# FIXME: consider other keyserver-options from gpg(1).
# in particular, the following might be interesting:
# timeout
# include-revoked
# include-disabled
# ca-cert-file
}
}
} else {
push(@{$self->{args}}, $line);
}
}
}
sub verify_cert {
my $self = shift;
my ($ok, $ctxstore, $certname, $error, $cert) = @_;
my $certpem = Net::SSLeay::PEM_get_string_X509($cert);
my ($status, $ret);
if (exists $self->{cache}->{$certpem}) {
($status, $ret) = @{$self->{cache}->{$certpem}};
$self->{logger}->log('debug', "Found response in cache\n");
} else {
# use Crypt::Monkeysphere::MSVA::Client if available:
if (defined($self->{client})) {
# because we really don't want to create some sort of MSVA loop:
($status, $ret) = $self->{client}->query_agent('https', $self->{config}->{host}, 'server', 'x509pem', $certpem, 'never');
} else {
use Crypt::Monkeysphere::MSVA;
$self->{logger}->log('verbose', "Could not find a running agent (MONKEYSPHERE_VALIDATION_AGENT_SOCKET env var).\nFalling back to in-process certificate checks.\n");
# If there is no running agent, we might want to be able to fall
# back here.
# FIXME: this is hackery! we're just calling daemon-internal code
# (and it's not a stable API):
my $data = {peer => { name => $self->{config}->{host}, type => 'server' },
context => 'https',
pkc => { type => 'x509pem', data => $certpem },
keyserverpolicy => 'never', # because we really don't want to create some sort of MSVA loop
};
my $clientinfo = { uid => POSIX::geteuid(), inode => undef };
($status, $ret) = Crypt::Monkeysphere::MSVA::reviewcert($data, $clientinfo);
}
# make a cache of the cert if it verifies once, since this seems
# to get called 3 times by perl for some reason. (see
# https://bugs.debian.org/606249)
$self->{cache}->{$certpem} = [ $status, $ret ];
if (JSON::is_bool($ret->{valid}) && ($ret->{valid} eq 1)) {
$self->{logger}->log('verbose', "Monkeysphere HKPMS Certificate validation succeeded:\n %s\n", $ret->{message});
} else {
my $m = '[undefined]';
$m = $ret->{message} if (defined($ret->{message}));
$self->{logger}->log('error', "Monkeysphere HKPMS Certificate validation failed:\n %s\n", $m);
}
}
if (JSON::is_bool($ret->{valid}) && ($ret->{valid} eq 1)) {
return 1;
} else {
return 0;
}
}
sub query {
my $self = shift;
# FIXME: i'd like to pass this debug argument to IO::Socket::SSL,
# but i don't know how to do that.
# i get 'Variable "@iosslargs" will not stay shared' if i try to call
# use IO::Socket::SSL 1.37 @iosslargs;
my @iosslargs = ();
if ($self->{logger}->get_log_level() >= 4) {
push @iosslargs, sprintf("debug%d", int($self->{logger}->get_log_level() - 3));
}
# versions earlier than 1.35 can fail open: bad news!.
# 1.37 lets us set ca_path and ca_file to undef, which is what we want.
use IO::Socket::SSL 1.37;
use Net::SSLeay;
use LWP::UserAgent;
use URI;
IO::Socket::SSL::set_ctx_defaults(
verify_callback => sub { $self->verify_cert(@_); },
verify_mode => 0x03,
ca_path => undef,
ca_file => undef,
);
my $ua = LWP::UserAgent::->new();
if (exists($self->{proxy})) {
$self->{logger}->log('verbose', "Using http-proxy: %s\n", $self->{proxy});
$ua->proxy([qw(http https)] => $self->{proxy});
} else {
# if no proxy was explicitly set, use the environment:
$ua->env_proxy();
}
printf("VERSION 1\nPROGRAM %s gpgkeys_hkpms msva-perl/%s\n",
$self->{config}->{program}, # this is kind of cheating :/
$Crypt::Monkeysphere::MSVA::VERSION);
$self->{logger}->log('debug', "command: %s\n", $self->{config}->{command});
if (lc($self->{config}->{command}) eq 'search') {
# for COMMAND = SEARCH, we want op=index, and we want to rejoin all args with spaces.
my $uri = URI::->new(sprintf('https://%s/pks/lookup', $self->{config}->{host}));
my $arg = join(' ', @{$self->{args}});
$uri->query_form(op => 'index',
options => 'mr',
search => $arg,
);
$arg =~ s/\n/ /g ; # swap out newlines for spaces
printf("\n%s %s BEGIN\n", $self->{config}->{command}, $arg);
$self->{logger}->log('debug', "URI: %s\n", $uri);
my $resp = $ua->get($uri);
if ($resp->is_success) {
print($resp->decoded_content);
} else {
# FIXME: handle errors better
$self->{logger}->log('error', "HTTPS error: %s\n", $resp->status_line);
}
printf("\n%s %s END\n", $self->{config}->{command}, $arg);
} elsif (lc($self->{config}->{command}) eq 'get') {
# for COMMAND = GET, we want op=get, and we want to issue each query separately.
my $uri = URI::->new(sprintf('https://%s/pks/lookup', $self->{config}->{host}));
foreach my $arg (@{$self->{args}}) {
printf("\n%s %s BEGIN\n", $self->{config}->{command}, $arg);
$uri->query_form(op => 'get',
options => 'mr',
search => $arg,
);
my $resp = $ua->get($uri);
if ($resp->is_success) {
print($resp->decoded_content);
} else {
# FIXME: handle errors better
$self->{logger}->log('error', "HTTPS error: %s\n", $resp->status_line);
}
printf("\n%s %s END\n", $self->{config}->{command}, $arg);
}
} elsif (lc($self->{config}->{command}) eq 'send') {
$self->{logger}->log('debug', "Sending keys");
# walk the input looking for "KEY E403BC1A17856FB7 BEGIN" lines.
my @keydata;
my $keyid;
foreach my $arg (@{$self->{args}}) {
if ($arg =~ /^KEY ([a-fA-F0-9]+) BEGIN\s*$/) {
@keydata = ();
$keyid = $1;
$self->{logger}->log('debug', "Found KEY BEGIN line (%s)\n", $keyid);
} elsif (defined($keyid)) {
if ($arg eq sprintf('KEY %s END', $keyid)) {
$self->{logger}->log('debug', "Found KEY END line with %d lines of data elapsed\n", scalar(@keydata));
# for sending keys, we want to POST to /pks/add, with a keytext variable.
my $uri = URI::->new(sprintf('https://%s/pks/add', $self->{config}->{host}));
my $resp = $ua->post($uri, {keytext => join("\n", @keydata)});
if ($resp->is_success) {
printf("\n%s", $resp->decoded_content);
} else {
# FIXME: handle errors better
$self->{logger}->log('error', "HTTPS error: %s\n", $resp->status_line);
}
printf("\nKEY %s SENT\n", $keyid);
@keydata = ();
$keyid = undef;
} else {
push @keydata, $arg;
}
} else {
$self->{logger}->log('debug2', "Found garbage line\n");
}
}
if (defined($keyid)) {
$self->{logger}->log('error', "Never got a 'KEY %s END' line, discarding.\n", $keyid);
}
} else {
# are there other commands we might want?
$self->{logger}->log('error', "Unknown command %s\n", $self->{config}->{command});
}
}
sub new {
my $class = shift;
my $default_log_level = 'error';
my $client;
if (exists($ENV{MONKEYSPHERE_VALIDATION_AGENT_SOCKET})) {
$client = Crypt::Monkeysphere::MSVA::Client::->new(
socket => $ENV{MONKEYSPHERE_VALIDATION_AGENT_SOCKET},
log_level => $default_log_level,
);
}
my $self = { config => { },
args => [ ],
logger => (defined($client) ? $client->{logger} : Crypt::Monkeysphere::Logger::->new($default_log_level)),
cache => { },
client => $client,
actually_check => 1,
};
bless ($self, $class);
return $self;
}
1;
}
my $hkpms = Crypt::Monkeysphere::MSVA::HKPMS::->new();
my $input = # load gpg instructions from stdin:
do {
local $/; # slurp!
<STDIN>;
};
$hkpms->parse_input($input);
$hkpms->query();
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