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|
#!/usr/bin/perl -T
#----------------------------------------------------------------------
# ACME client written with process isolation and minimal privileges in mind
# Copyright © 2016 Guilhem Moulin <guilhem@fripost.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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. If not, see <http://www.gnu.org/licenses/>.
#----------------------------------------------------------------------
use strict;
use warnings;
our $VERSION = '0.0.1';
my $NAME = 'lacme';
use Errno qw/EADDRINUSE EINTR/;
use Fcntl qw/F_GETFD F_SETFD FD_CLOEXEC SEEK_SET/;
use File::Temp ();
use Getopt::Long qw/:config posix_default no_ignore_case gnu_getopt auto_version/;
use List::Util 'first';
use POSIX ();
use Socket qw/AF_UNIX PF_INET PF_INET6 PF_UNIX PF_UNSPEC INADDR_ANY IN6ADDR_ANY
SOCK_STREAM SOL_SOCKET SO_REUSEADDR SHUT_RDWR/;
use Config::Tiny ();
use Net::SSLeay ();
# Clean up PATH
$ENV{PATH} = join ':', qw{/usr/bin /bin};
delete @ENV{qw/IFS CDPATH ENV BASH_ENV/};
my ($COMMAND, %OPTS, $CONFFILE, $CONFIG, @CLEANUP);
$SIG{$_} = sub() { exit 1 } foreach qw/INT TERM/; # run the END block upon SIGINT/SIGTERM
#############################################################################
# Parse and validate configuration
#
sub usage(;$$) {
my $rv = shift // 0;
if ($rv) {
my $msg = shift;
print STDERR $msg."\n" if defined $msg;
print STDERR "Try '$NAME --help' or consult the manpage for more information.\n";
}
else {
print STDERR "Usage: $NAME [--config=FILE] [--socket=PATH] [OPTIONS] COMMAND [ARGUMENT ..]\n"
."Consult the manpage for more information.\n";
}
exit $rv;
}
usage(1) unless GetOptions(\%OPTS, qw/config=s config-certs=s socket=s agreement-uri=s quiet|q debug help|h/);
usage(0) if $OPTS{help};
$COMMAND = shift(@ARGV) // usage(1, "Missing command");
$COMMAND = $COMMAND =~ /\A(new-reg|reg=\p{Print}*|new-cert|revoke-cert)\z/ ? $1
: usage(1, "Invalid command: $COMMAND"); # validate and untaint $COMMAND
@ARGV = map { /\A(\p{Print}*)\z/ ? $1 : die } @ARGV; # untaint @ARGV
do {
my $conffile = $OPTS{config} // first { -f $_ }
( "./$NAME.conf"
, ($ENV{XDG_CONFIG_HOME} // "$ENV{HOME}/.config")."/lacme/$NAME.conf"
, "/etc/lacme/$NAME.conf"
);
die "Error: Can't find configuration file\n" unless defined $conffile;
print STDERR "Using configuration file: $conffile\n" if $OPTS{debug};
open $CONFFILE, '<', $conffile or die "Can't open $conffile: $!\n";
my $conf = do { local $/ = undef, <$CONFFILE> };
# don't close $CONFFILE so we can pass it to the client
my $h = Config::Tiny::->read_string($conf) or die Config::Tiny::->errstr()."\n";
my $defaults = delete $h->{_} // {};
my $accountd = exists $h->{accountd} ? 1 : 0;
my %valid = (
client => {
socket => (defined $ENV{XDG_RUNTIME_DIR} ? "$ENV{XDG_RUNTIME_DIR}/S.lacme" : undef),
user => 'nobody',
group => 'nogroup',
command => '/usr/lib/lacme/client',
# the rest is for the ACME client
map {$_ => undef} qw/server timeout SSL_verify SSL_version SSL_cipher_list/
},
webserver => {
listen => ':80',
'challenge-directory' => '/var/www/acme-challenge',
user => 'www-data',
group => 'www-data',
command => '/usr/lib/lacme/webserver',
iptables => 'Yes'
},
accountd => {
user => '',
group => '',
command => '/usr/bin/lacme-accountd',
config => '/etc/lacme/lacme-accountd.conf',
privkey => undef,
quiet => 'Yes',
}
);
foreach my $s (keys %valid) {
my $h = delete $h->{$s} // {};
my %v = map { $_ => delete $h->{$_} // $valid{$s}->{$_} } keys %{$valid{$s}};
die "Unknown option(s) in [$s]: ".join(', ', keys %$h)."\n" if %$h;
$h->{$_} //= $defaults->{$_} foreach keys %$defaults;
$CONFIG->{$s} = \%v;
}
die "Invalid section(s): ".join(', ', keys %$h)."\n" if %$h;
$CONFIG->{_} = $defaults;
delete $CONFIG->{accountd} unless $accountd;
$OPTS{quiet} = 0 if $OPTS{debug};
};
# Regular expressions for domain validation
my $RE_LABEL = qr/[0-9a-z](?:[0-9a-z\x2D]{0,61}[0-9a-z])?/aai;
my $RE_DOMAIN = qr/$RE_LABEL(?:\.$RE_LABEL)+/;
#############################################################################
# Generate a Certificate Signing Request (in DER format)
#
sub gen_csr(%) {
my %args = @_;
return unless defined $args{'certificate-key'} and defined $args{subject};
return if defined $args{hash} and !grep { $args{hash} eq $_ } qw/md5 rmd160 sha1 sha224 sha256 sha384 sha512/;
my $config = File::Temp::->new(SUFFIX => '.conf', TMPDIR => 1) // die;
$config->print(
"[ req ]\n",
"distinguished_name = req_distinguished_name\n",
"req_extensions = v3_req\n",
"[ req_distinguished_name ]\n",
"[ v3_req ]\n",
# XXX Golang errors on extensions marked critical
# https://github.com/letsencrypt/boulder/issues/565
#"basicConstraints = critical, CA:FALSE\n",
"basicConstraints = CA:FALSE\n",
"subjectKeyIdentifier = hash\n"
);
#$config->print("keyUsage = critical, $args{keyUsage}\n") if defined $args{keyUsage};
$config->print("keyUsage = $args{keyUsage}\n") if defined $args{keyUsage};
$config->print("subjectAltName = $args{subjectAltName}\n") if defined $args{subjectAltName};
$config->close() or die "Can't close: $!";
my @args = (qw/-new -batch -key/, $args{'certificate-key'});
push @args, "-$args{hash}" if defined $args{hash};
push @args, '-subj', $args{subject}, '-config', $config->filename(), qw/-reqexts v3_req/;
open my $fh, '-|', qw/openssl req -outform DER/, @args or die "fork: $!";
my $csr = do { local $/ = undef; <$fh> };
close $fh or $! ? die "Can't close: $!" : return;
if ($OPTS{debug}) {
# print out the CSR in text form
pipe my $rd, my $wd or die "pipe: $!";
my $pid = fork // die "fork: $!";
unless ($pid) {
open STDIN, '<&', $rd or die "Can't dup: $!";
open STDOUT, '>&', \*STDERR or die "Can't dup: $!";
exec qw/openssl req -noout -text -inform DER/ or die;
}
$rd->close() or die "Can't close: $!";
$wd->print($csr);
$wd->close() or die "Can't close: $!";
waitpid $pid => 0;
die $? if $? > 0;
}
return $csr;
}
#############################################################################
# Get the timestamp of the given cert's expiration date.
# Internally the expiration date is stored as a RFC3339 string (such as
# yyyy-mm-ddThh:mm:ssZ); we convert it to a timestamp manually.
#
sub x509_enddate($) {
my $filename = shift;
my ($bio, $x509, $time, $dt);
$bio = Net::SSLeay::BIO_new_file($filename, 'r');
$x509 = Net::SSLeay::PEM_read_bio_X509($bio) if defined $bio;
$time = Net::SSLeay::X509_get_notAfter($x509) if defined $x509;
$dt = Net::SSLeay::P_ASN1_TIME_get_isotime($time) if defined $time;
my $t;
if (defined $dt and $dt =~ s/\A(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})//) {
# RFC3339 datetime strings; assume epoch is on January 1 of $epoch_year
my ($y, $m, $d, $h, $min, $s) = ($1, $2, $3, $4, $5, $6);
my (undef,undef,undef,undef,undef,$epoch_year,undef,undef,undef) = gmtime(0);
$t = 0;
foreach (($epoch_year+1900) .. $y-1) {
$t += 365*86400;
$t += 86400 if ($_ % 4 == 0 and $_ % 100 != 0) or ($_ % 400 == 0); # leap
}
if ($m > 1) {
my @m = (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
$m[1]++ if ($y % 4 == 0 and $y % 100 != 0) or ($y % 400 == 0); # leap
$t += 86400*$m[$_] for (0 .. $m-2);
}
$t += 86400*($d-1);
$t += $s + 60*($min + 60*$h);
$dt =~ s/\A\.(\d{1,9})\d*//; # ignore nanosecs
if ($dt =~ /\A([+-])(\d{2}):(\d{2})\z/) {
my $tz = 60*($3 + 60*$2);
$t = $1 eq '-' ? ($t+$tz) : ($t-$tz);
}
}
Net::SSLeay::X509_free($x509) if defined $x509;
Net::SSLeay::BIO_free($bio) if defined $bio;
return $t;
}
#############################################################################
# Drop privileges and chdir afterwards
#
sub drop_privileges($$$) {
my ($user, $group, $dir) = @_;
# set effective and real gid; also set the list of supplementary gids to that single gid
if ($group ne '') {
my $gid = getgrnam($group) // die "Can't getgrnam($group): $!";
$) = "$gid $gid";
die "Can't setgroups: $!" if $@;
POSIX::setgid($gid) or die "Can't setgid: $!";
die "Couldn't setgid/setguid" unless $( eq "$gid $gid" and $) eq "$gid $gid"; # safety check
}
# set effective and real uid
if ($user ne '') {
my $uid = getpwnam($user) // die "Can't getpwnam($user): $!";
POSIX::setuid($uid) or die "Can't setuid: $!";
die "Couldn't setuid/seteuid" unless $< == $uid and $> == $uid; # safety check
}
chdir $dir or die "Can't chdir to $dir: $!";
}
#############################################################################
# Ensure the FD_CLOEXEC bit is $set on $fd
#
sub set_FD_CLOEXEC($$) {
my ($fd, $set) = @_;
my $flags = fcntl($fd, F_GETFD, 0) or die "Can't fcntl F_GETFD: $!";
my $flags2 = $set ? ($flags | FD_CLOEXEC) : ($flags & ~FD_CLOEXEC);
return if $flags == $flags2;
fcntl($fd, F_SETFD, $flags2) or die "Can't fcntl F_SETFD: $!";
}
#############################################################################
# Try to spawn a webserver to serve ACME challenges, and return the
# temporary challenge directory.
# If a webserver is already listening, symlink the 'challenge-directory'
# configuration option to the temporary challenge directory.
# Otherwise, bind(2) a socket, pass its fileno to the webserver
# component, and optionally install iptables rules.
#
sub spawn_webserver() {
# create a temporary directory; give write access to the ACME client
# and read access to the webserver
my $tmpdir = File::Temp::->newdir(CLEANUP => 1, TMPDIR => 1) // die;
chmod 0755, $tmpdir or die "Can't chmod: $!";
if ((my $username = $CONFIG->{client}->{user}) ne '') {
my $uid = getpwnam($username) // die "Can't getgrnam($username): $!";
chown($uid, -1, $tmpdir) or die "Can't chown: $!";
}
my $conf = $CONFIG->{webserver};
my ($fam, $addr, $port) = (PF_INET, $conf->{listen}, 80);
$port = $1 if $addr =~ s/:(\d+)$//;
$addr = Socket::inet_ntop(PF_INET, INADDR_ANY) if $addr eq '';
$fam = PF_INET6 if $addr =~ s/^\[(.+)\]$/$1/;
my $proto = getprotobyname("tcp") // die;
socket(my $srv, $fam, SOCK_STREAM, $proto) or die "socket: $!";
setsockopt($srv, SOL_SOCKET, SO_REUSEADDR, pack("l", 1)) or die "setsockopt: $!";
$addr = Socket::inet_pton($fam, $addr) // die "Invalid address $conf->{listen}\n";
my $sockaddr = $fam == PF_INET ? Socket::pack_sockaddr_in($port, $addr)
: $fam == PF_INET6 ? Socket::pack_sockaddr_in6($port, $addr)
: die;
# try to bind aginst the specified address:port
bind($srv, $sockaddr) or do {
die "Can't bind to $conf->{listen}: $!" if $! != EADDRINUSE;
print STDERR "[$$] Using existing webserver on $conf->{listen}\n" if $OPTS{debug};
my $dir = $conf->{'challenge-directory'};
symlink $tmpdir, $dir or die "Can't symlink $dir -> $tmpdir: $!";
push @CLEANUP, sub() {
print STDERR "Unlinking $dir\n" if $OPTS{debug};
unlink $dir or warn "Warning: Can't unlink $dir: $!";
};
return $tmpdir;
};
listen($srv, 5) or die "listen: $!";
# spawn the webserver component
my $pid = fork() // "fork: $!";
unless ($pid) {
drop_privileges($conf->{user}, $conf->{group}, $tmpdir);
set_FD_CLOEXEC($srv, 0);
$ENV{DEBUG} = $OPTS{debug};
# use execve(2) rather than a Perl pseudo-process to ensure that
# the child doesn't have access to the parent's memory
exec $conf->{command}, fileno($srv) or die;
}
print STDERR "[$$] Forking ACME webserver, child PID $pid\n" if $OPTS{debug};
set_FD_CLOEXEC($srv, 1);
push @CLEANUP, sub() {
print STDERR "[$$] Shutting down ACME webserver\n" if $OPTS{debug};
shutdown($srv, SHUT_RDWR) or warn "shutdown: $!";
kill 15 => $pid;
waitpid $pid => 0;
};
return $tmpdir if lc ($conf->{iptables} // 'Yes') eq 'no';
# install iptables
my $iptables_bin = $fam == PF_INET ? 'iptables' : $fam == PF_INET6 ? 'ip6tables' : die;
my $iptables_tmp = File::Temp::->new(TMPDIR => 1) // die;
set_FD_CLOEXEC($iptables_tmp, 1);
my $pid2 = fork() // die "fork: $!";
unless ($pid2) {
open STDIN, '<', '/dev/null' or die "Can't open /dev/null: $!";
open STDOUT, '>&', $iptables_tmp or die "Can't dup: $!";
$| = 1; # turn off buffering for STDOUT
exec "/sbin/$iptables_bin-save", "-c" or die;
}
waitpid $pid2 => 0;
die "Error: /sbin/$iptables_bin-save exited with value ".($? >> 8) if $? > 0;
# seek back to the begining, as we'll restore directly from the
# handle and not from the file. XXX if there was a way in Perl to
# use open(2) with the O_TMPFILE flag we would use that to avoid
# creating a file to start with
seek($iptables_tmp, SEEK_SET, 0) or die "Can't seek: $!";
push @CLEANUP, sub() {
print STDERR "[$$] Restoring iptables\n" if $OPTS{debug};
my $pid2 = fork() // die "fork: $!";
unless ($pid2) {
open STDIN, '<&', $iptables_tmp or die "Can't dup: $!";
open STDOUT, '>', '/dev/null' or die "Can't open /dev/null: $!";
exec "/sbin/$iptables_bin-restore", "-c" or die;
}
waitpid $pid2 => 0;
warn "Warning: /sbin/$iptables_bin-restore exited with value ".($? >> 8) if $? > 0;
};
# it's safe to install the new iptables to open $port now that the
# restore hook is in place
my $mask = $fam == PF_INET ? ($addr eq INADDR_ANY ? '0' : '32')
: $fam == PF_INET6 ? ($addr eq IN6ADDR_ANY ? '0' : '128')
: die;
my $dest = Socket::inet_ntop($fam, $addr) .'/'. $mask;
system ("/sbin/$iptables_bin", qw/-I INPUT -p tcp -m tcp -m state/,
'-d', $dest, '--dport', $port,
'--state', 'NEW,ESTABLISHED', '-j', 'ACCEPT') == 0 or die;
system ("/sbin/$iptables_bin", qw/-I OUTPUT -p tcp -m tcp -m state/,
'-s', $dest, '--sport', $port,
'--state', 'ESTABLISHED', '-j', 'ACCEPT') == 0 or die;
return $tmpdir;
}
#############################################################################
# Spawn the client component, and wait for it to return.
# If $args->{in} is defined, the data is written to the client's STDIN.
# If $args->{out} is defined, its value is set to client's STDOUT data.
#
sub acme_client($@) {
my $args = shift;
my @args = @_;
my ($client, $cleanup);
my $conf = $CONFIG->{client};
if (defined (my $accountd = $CONFIG->{accountd})) {
socketpair($client, my $s, AF_UNIX, SOCK_STREAM, PF_UNSPEC) or die "socketpair: $!";
my $pid = fork() // "fork: $!";
unless ($pid) {
drop_privileges($accountd->{user}, $accountd->{group}, '/');
set_FD_CLOEXEC($s, 0);
$client->close() or die "Can't close: $!";
my @cmd = ($accountd->{command}, '--conn-fd='.fileno($s));
push @cmd, '--config='.$accountd->{config} if defined $accountd->{config};
push @cmd, '--privkey='.$accountd->{privkey} if defined $accountd->{privkey};
push @cmd, '--quiet' unless lc $accountd->{quiet} eq 'no';
push @cmd, '--debug' if $OPTS{debug};
exec { $cmd[0] } @cmd or die;
}
print STDERR "[$$] Forking lacme-accountd, child PID $pid\n" if $OPTS{debug};
$s->close() or die "Can't close: $!";
$cleanup = sub() {
print STDERR "[$$] Shutting down lacme-accountd\n" if $OPTS{debug};
shutdown($client, SHUT_RDWR) or warn "shutdown: $!";
$client->close() or warn "close: $!";
};
push @CLEANUP, $cleanup;
}
else {
my @stat;
my $sockname = $OPTS{socket} // $conf->{socket} // die "Missing socket option\n";
$sockname = $sockname =~ /\A(\p{Print}+)\z/ ? $1 : die "Invalid socket name\n"; # untaint $sockname
# ensure we're the only user with write access to the parent dir
my $dirname = $sockname =~ s/[^\/]+$//r;
@stat = stat($dirname) or die "Can't stat $dirname: $!";
die "Error: insecure permissions on $dirname\n" if ($stat[2] & 0022) != 0;
# ensure we're the only user with read/write access to the socket
@stat = stat($sockname) or die "Can't stat $sockname: $! (Is lacme-accountd running?)\n";
die "Error: insecure permissions on $sockname\n" if ($stat[2] & 0066) != 0;
# connect(2) to the socket
socket($client, PF_UNIX, SOCK_STREAM, 0) or die "socket: $!";
my $sockaddr = Socket::sockaddr_un($sockname) // die "Invalid address $sockname\n";
until (connect($client, $sockaddr)) {
next if $! == EINTR; # try again if connect(2) was interrupted by a signal
die "connect: $!";
}
}
# use execve(2) rather than a Perl pseudo-process to ensure that the
# child doesn't have access to the parent's memory
my @fileno = map { fileno($_) =~ /^(\d+)$/ ? $1 : die } ($CONFFILE, $client); # untaint fileno
set_FD_CLOEXEC($client, 1);
my $rv = spawn({%$args{qw/in out/}, child => sub() {
drop_privileges($conf->{user}, $conf->{group}, $args->{chdir} // '/');
set_FD_CLOEXEC($_, 0) foreach ($CONFFILE, $client);
seek($CONFFILE, SEEK_SET, 0) or die "Can't seek: $!";
$ENV{DEBUG} = $OPTS{debug};
}}, $conf->{command}, $COMMAND, @fileno, @args);
if (defined $cleanup) {
@CLEANUP = grep { $_ ne $cleanup } @CLEANUP;
$cleanup->();
}
return $rv;
}
sub spawn($@) {
my $args = shift;
my @exec = @_;
# create communication pipes if needed
my ($in_rd, $in_wd, $out_rd, $out_wd);
if (defined $args->{in}) {
pipe $in_rd, $in_wd or die "pipe: $!";
}
if (defined $args->{out}) {
pipe $out_rd, $out_wd or die "pipe: $!";
}
my $pid = fork() // "fork: $!";
unless ($pid) {
# child
$args->{child}->() if defined $args->{child};
if (defined $args->{in}) {
close $in_wd or die "Can't close: $!";
open STDIN, '<&', $in_rd or die "Can't dup: $!";
} else {
open STDIN, '<', '/dev/null' or die "Can't open /dev/null: $!";
}
if (defined $args->{out}) {
close $out_rd or die "Can't close: $!";
open STDOUT, '>&', $out_wd or die "Can't dup: $!";
} else {
open STDOUT, '>', '/dev/null' or die "Can't open /dev/null: $!";
}
exec { $exec[0] } @exec or die;
}
push @CLEANUP, sub() {
kill 15 => $pid;
waitpid $pid => 0;
};
# parent
print STDERR "[$$] Forking $exec[0], child PID $pid\n" if $OPTS{debug};
if (defined $args->{in}) {
$in_rd->close() or die "Can't close: $!";
$in_wd->print($args->{in});
$in_wd->close() or die "Can't close: $!";
}
if (defined $args->{out}) {
$out_wd->close() or die "Can't close: $!";
${$args->{out}} = do { local $/ = undef; $out_rd->getline() };
$out_rd->close() or die "Can't close: $!";
}
waitpid $pid => 0;
pop @CLEANUP;
undef ${$args->{out}} if defined $args->{out} and $? > 0;
return $? > 255 ? ($? >> 8) : $? > 0 ? 1 : 0;
}
#############################################################################
# Install the certificate
#
sub install_cert($$@) {
my $filename = shift;
my $x509 = shift;
open my $fh, '>', $filename or die "Can't open $filename: $!";
print $fh $x509;
foreach (@_) { # append the chain
open my $fh2, '<', $_ or die "Can't open $_: $!";
my $ca = do { local $/ = undef; $fh2->getline() };
print $fh $ca;
close $fh2 or die "Can't close: $!";
}
close $fh or die "Can't close: $!";
}
#############################################################################
# new-reg [--agreement-uri=URI] [CONTACT ..]
# reg=URI [--agreement-uri=URI] [CONTACT ..]
#
if ($COMMAND eq 'new-reg' or $COMMAND =~ /^reg=/) {
die "Invalid registration URI (use the 'new-reg' command to determine the URI)\n"
if $COMMAND eq 'reg=';
$OPTS{'agreement-uri'} = $OPTS{'agreement-uri'} =~ /\A(\p{Print}+)\z/ ? $1
: die "Invalid value for --agreement-uri\n"
if defined $OPTS{'agreement-uri'};
unshift @ARGV, ($OPTS{'agreement-uri'} // '');
exit acme_client({}, @ARGV);
}
#############################################################################
# new-cert [SECTION ..]
#
elsif ($COMMAND eq 'new-cert') {
my $conf;
do {
my $conffile = $OPTS{'config-certs'} // $CONFIG->{_}->{'config-certs'} // first { -f $_ }
( "./$NAME-certs.conf"
, ($ENV{XDG_CONFIG_HOME} // "$ENV{HOME}/.config")."/lacme/$NAME-certs.conf"
, "/etc/lacme/$NAME-certs.conf"
);
die "Error: Can't find certificate configuration file\n" unless defined $conffile;
my $h = Config::Tiny::->read($conffile) or die Config::Tiny::->errstr()."\n";
my $defaults = delete $h->{_} // {};
my @valid = qw/certificate certificate-chain certificate-key min-days CAfile
hash keyUsage subject subjectAltName chown chmod notify/;
foreach my $s (keys %$h) {
$conf->{$s} = { map { $_ => delete $h->{$s}->{$_} } @valid };
die "Unknown option(s) in [$s]: ".join(', ', keys %{$h->{$s}})."\n" if %{$h->{$s}};
$conf->{$s}->{$_} //= $defaults->{$_} foreach keys %$defaults;
}
};
my $challenge_dir;
my $rv = 0;
foreach my $s (@ARGV ? @ARGV : keys %$conf) {
my $conf = $conf->{$s} // do {
print STDERR "Warning: No such section $s, skipping\n";
$rv = 1;
next;
};
my $certtype = first { defined $conf->{$_} } qw/certificate certificate-chain/;
unless (defined $certtype) {
print STDERR "[$s] Warning: Missing 'certificate' and 'certificate-chain', skipping\n";
$rv = 1;
next;
}
# skip certificates that expire at least $conf->{'min-days'} days in the future
if (-f $conf->{$certtype} and defined (my $t = x509_enddate($conf->{$certtype}))) {
my $d = $conf->{'min-days'} // 10;
if ($d > 0 and $t - time > $d*86400) {
my $d = POSIX::strftime('%Y-%m-%d %H:%M:%S UTC', gmtime($t));
print STDERR "[$s] Valid until $d, skipping\n" unless $OPTS{quiet};
next;
}
}
# generate the CSR
my $csr = gen_csr(%$conf{qw/certificate-key subject subjectAltName keyUsage hash/}) // do {
print STDERR "[$s] Warning: Couldn't generate CSR, skipping\n";
$rv = 1;
next;
};
# spawn the webserver if not done already
$challenge_dir //= spawn_webserver();
# list all authorization domains to request
my @authz;
push @authz, $1 if defined $conf->{subject} =~ /\A.*\/CN=($RE_DOMAIN)\z/o;
if (defined $conf->{subjectAltName}) {
foreach my $d (split /,/, $conf->{subjectAltName}) {
next unless $d =~ s/\A\s*DNS://;
if ($d =~ /\A$RE_DOMAIN\z/o) {
push @authz, $d unless grep {$_ eq $d} @authz;
} else {
print STDERR "[$s] Warning: Ignoring invalid domain $d\n";
}
}
}
my ($x509, $csr_pubkey, $x509_pubkey);
print STDERR "[$s] Will request authorization for: ".join(", ", @authz), "\n" if $OPTS{debug};
if (acme_client({chdir => $challenge_dir, in => $csr, out => \$x509}, @authz)) {
print STDERR "[$s] Error: Couldn't issue X.509 certificate!\n";
$rv = 1;
next;
}
# extract pubkeys from CSR and cert, and ensure they match
spawn({in => $csr, out => \$csr_pubkey }, qw/openssl req -inform DER -noout -pubkey/);
spawn({in => $x509, out => \$x509_pubkey}, qw/openssl x509 -inform PEM -noout -pubkey/);
unless (defined $x509_pubkey and defined $csr_pubkey and $x509_pubkey eq $csr_pubkey) {
print STDERR "[$s] Error: Received bogus X.509 certificate from ACME server!\n";
$rv = 1;
next;
};
# verify certificate validity against the CA
$conf->{CAfile} //= '/usr/share/lacme/lets-encrypt-x3-cross-signed.pem';
if ($conf->{CAfile} ne '' and spawn({in => $x509}, 'openssl', 'verify', '-CAfile', $conf->{CAfile},
qw/-purpose sslserver -x509_strict/)) {
print STDERR "[$s] Error: Received invalid X.509 certificate from ACME server!\n";
$rv = 1;
next;
}
# install certificate
if (defined $conf->{'certificate'}) {
print STDERR "Installing X.509 certificate $conf->{'certificate'}\n";
install_cert($conf->{'certificate'}, $x509);
}
if (defined $conf->{'certificate-chain'}) {
print STDERR "Installing X.509 certificate chain $conf->{'certificate-chain'}\n";
install_cert($conf->{'certificate-chain'}, $x509, $conf->{CAfile});
}
if (defined $conf->{chown}) {
my ($user, $group) = split /:/, $conf->{chown}, 2;
my $uid = getpwnam($user) // die "Can't getpwnam($user): $!";
my $gid = defined $group ? (getgrnam($group) // die "Can't getgrnam($group): $!") : -1;
foreach (grep defined, @$conf{qw/certificate certificate-chain/}) {
chown($uid, $gid, $_) or die "Can't chown: $!";
}
}
if (defined $conf->{chmod}) {
my $mode = oct($conf->{chmod}) // die;
foreach (grep defined, @$conf{qw/certificate certificate-chain/}) {
chmod($mode, $_) or die "Can't chown: $!";
}
}
my @certopts = join ',', qw/no_header no_version no_pubkey no_sigdump/;
open my $fh, '|-', qw/openssl x509 -noout -fingerprint -sha256 -text -certopt/, @certopts
or die "fork: $!";
print $fh $x509;
close $fh or die $! ?
"Can't close: $!" :
"Error: x509(1ssl) exited with value ".($? >> 8)."\n";
if (defined $conf->{notify}) {
print STDERR "Running notification command `$conf->{notify}`\n";
if (system($conf->{notify}) != 0) {
print STDERR "Warning: notification command exited with value ".($? >> 8)."\n";
$rv = 1;
}
}
}
undef $challenge_dir;
exit $rv;
}
#############################################################################
# revoke-cert FILE [FILE ..]
#
elsif ($COMMAND eq 'revoke-cert') {
die "Nothing to revoke\n" unless @ARGV;
my $rv = 0;
foreach my $filename (@ARGV) {
print STDERR "Revoking $filename\n";
# conversion PEM -> DER
open my $fh, '-|', qw/openssl x509 -outform DER -in/, $filename or die "fork: $!";
my $der = do { local $/ = undef; <$fh> };
close $fh or die $! ?
"Can't close: $!" :
"Error: x509(1ssl) exited with value ".($? >> 8)."\n";
my @certopts = join ',', qw/no_header no_version no_pubkey no_sigdump no_extensions/;
open my $fh2, '|-', qw/openssl x509 -inform DER -noout -fingerprint -sha256 -text -certopt/, @certopts
or die "fork: $!";
print $fh2 $der;
close $fh2 or die $! ?
"Can't close: $!" :
"Error: x509(1ssl) exited with value ".($? >> 8)."\n";
if (acme_client({in => $der})) {
print STDERR "Warning: Couldn't revoke $filename\n";
$rv = 1;
}
}
exit $rv;
}
#############################################################################
#
else {
die "Unknown command $COMMAND"
}
END {
local $?;
$_->() foreach reverse @CLEANUP;
}
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