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authorGuilhem Moulin <guilhem@fripost.org>2016-06-13 23:14:00 +0200
committerGuilhem Moulin <guilhem@fripost.org>2016-06-13 23:14:00 +0200
commit08d9f95505bb11c3d1b6a8c649362ede7dab4138 (patch)
treeacc9aa7f86e28d61a0c3f26e30f8a07848f668a5 /lacme
parentd038f67d1e075010d36272595ea845e2f57e55ac (diff)
Rename ‘letsencrypt-tiny’ to ‘lacme’.
Diffstat (limited to 'lacme')
-rwxr-xr-xlacme705
1 files changed, 705 insertions, 0 deletions
diff --git a/lacme b/lacme
new file mode 100755
index 0000000..12fb181
--- /dev/null
+++ b/lacme
@@ -0,0 +1,705 @@
+#!/usr/bin/perl -T
+
+#----------------------------------------------------------------------
+# ACME client
+# 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 $NAME = 'lacme';
+
+use Errno qw/EADDRINUSE EINTR/;
+use Fcntl qw/F_GETFD F_SETFD FD_CLOEXEC SEEK_SET/;
+use File::Temp ();
+use Getopt::Long qw/:config posix_default no_ignore_case gnu_getopt auto_version/;
+use List::Util 'first';
+use POSIX ();
+use Socket qw/PF_INET PF_INET6 PF_UNIX INADDR_ANY IN6ADDR_ANY
+ SOCK_STREAM SOL_SOCKET SO_REUSEADDR SHUT_RDWR/;
+
+use Config::Tiny ();
+use Net::SSLeay ();
+
+# Clean up PATH
+$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 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 %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'
+
+ }
+ );
+ 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;
+};
+
+# 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 @stat;
+ my $conf = $CONFIG->{client};
+ 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(my $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, $client); # untaint fileno
+ spawn({%$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}, $COMMAND, @fileno, @args);
+}
+
+sub spawn($@) {
+ 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 ..]
+# TODO: renewal without the account key, see
+# https://github.com/letsencrypt/acme-spec/pull/168
+# https://github.com/letsencrypt/acme-spec/issues/191
+#
+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";
+ 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;
+}