]> Raphaël G. Git Repositories - acme/blobdiff - Acme.pm
Fix config generation
[acme] / Acme.pm
diff --git a/Acme.pm b/Acme.pm
new file mode 100644 (file)
index 0000000..db1c6d4
--- /dev/null
+++ b/Acme.pm
@@ -0,0 +1,760 @@
+# This file is part of Acmepl
+#
+# Acmepl is 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/>.
+#
+# Copyright (C) 2016 - 2017 Raphaël Gertz <acmepl@rapsys.eu>
+
+# acme package
+package acme;
+
+# Best practice
+use strict;
+use warnings;
+
+# Symbol export
+use Exporter;
+our @ISA = qw(Exporter);
+our @EXPORT_OK = qw(DS CERT_DIR KEY_DIR REQUEST_CSR ACCOUNT_KEY SERVER_KEY SERVER_CRT CONFIG);
+
+# Load dependancies
+use Carp qw(carp confess);
+use Date::Parse qw(str2time);
+use Digest::SHA qw(sha256_base64);
+use Email::Valid;
+use File::Path qw(make_path);
+use File::Slurp qw(read_file write_file);
+use File::Temp; # qw( :seekable );
+use IPC::System::Simple qw(capturex);
+use JSON qw(from_json to_json);
+use LWP;
+use MIME::Base64 qw(encode_base64url encode_base64);
+use Net::Domain::TLD;
+use POSIX qw(EXIT_FAILURE);
+use Tie::IxHash;
+
+# Documentation links
+#XXX: see https://letsencrypt.github.io/acme-spec/ (probably based on https://ietf-wg-acme.github.io/acme/)
+#XXX: see jwk rfc http://www.rfc-editor.org/rfc/rfc7517.txt
+#XXX: see javascript implementation https://github.com/diafygi/gethttpsforfree/blob/gh-pages/js/index.js
+
+# Set constants
+use constant {
+       # Directory separator
+       DS => '/',
+
+       # Directory for certificates
+       CERT_DIR => 'cert',
+
+       # Directory for keys
+       KEY_DIR => 'key',
+
+       # Directory for pending cache
+       PENDING_DIR => 'pending',
+
+       # Request certificate file name
+       REQUEST_CSR => 'request.der',
+
+       # Account key file name
+       ACCOUNT_KEY => 'account.pem',
+
+       # Server private key
+       SERVER_KEY => 'server.pem',
+
+       # Server public certificate
+       SERVER_CRT => 'server.crt',
+
+       # rsa
+       KEY_TYPE => 'rsa',
+
+       # 2048|4096
+       KEY_SIZE => 4096,
+
+       # Acme infos
+       ACME_CERT => 'https://letsencrypt.org/certs/lets-encrypt-x3-cross-signed.pem',
+       ACME_DIR => 'https://acme-staging.api.letsencrypt.org/directory',
+       ACME_PROD_DIR => 'https://acme-v01.api.letsencrypt.org/directory',
+       ACME_TERMS => 'https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf',
+
+       # Version
+       VERSION => 'v0.6',
+
+       # Config
+       CONFIG => '/etc/acmepl/config'
+};
+
+# User agent object
+our $ua;
+
+# Strerr backup
+our $_stderr;
+
+# JSON Web Key (JWK)
+#XXX: tie to Tie::IxHash to keep a stable ordering of hash keys
+#our %jwk = (
+#      pubkey => undef,
+#      jwk => {
+#              alg => 'RS256',
+#              jwk => {
+#                      # Exponent
+#                      e => undef,
+#                      # Key type
+#                      kty => uc(KEY_TYPE),
+#                      # Modulus
+#                      n => undef
+#              }
+#      },
+#      thumbprint => undef
+#);
+tie(our %jwk, 'Tie::IxHash', pubkey => undef, jwk => undef, thumbprint => undef);
+tie(%{$jwk{jwk}}, 'Tie::IxHash', alg => 'RS256', jwk => undef);
+#XXX: strict ordering only really needed here for thumbprint sha256 digest
+tie(%{$jwk{jwk}{jwk}}, 'Tie::IxHash', e => undef, kty => uc(KEY_TYPE), n => undef);
+
+# Constructor
+sub new {
+       # Extract params
+       my ($class, $mail, $debug, $prod, @domains) = @_;
+
+       # Create self hash
+       my $self = {};
+
+       # Link self to package
+       bless($self, $class);
+
+       # Save debug
+       $self->{debug} = $debug;
+
+       # Save prod
+       $self->{prod} = $prod;
+
+       # Add extra check to mail validity
+       #XXX: mxcheck fail if there is only a A record on the domain
+       my $ev = Email::Valid->new(-fqdn => 1, -tldcheck => 1, -mxcheck => 1);
+
+       # Show error if check fail
+       if (! defined $ev->address($mail)) {
+               map { carp 'failed check: '.$_ if ($self->{debug}) } $ev->details();
+               confess 'Email::Valid->address failed';
+       }
+
+       # Save mail
+       $self->{mail} = $mail;
+
+       # Create resolver
+       my $res = new Net::DNS::Resolver();
+
+       # Check domains
+       map {
+               my $tld;
+
+               # Extract tld
+               unless (($tld) = $_ =~ m/\.(\w+)$/) {
+                       confess $_.'\'s tld extraction failed';
+               }
+
+               # Check if tld exists
+               unless(Net::Domain::TLD::tld_exists($tld)) {
+                       confess $tld.' tld from '.$_.' don\'t exists';
+               }
+
+               # Check if we get dns answer
+               #XXX: only search A type because letsencrypt don't support ipv6 (AAAA) yet
+               unless(my $rep = $res->search($_, 'A')) {
+                       confess 'search A record for '.$_.' failed';
+               } else {
+                       unless (scalar map { $_->type eq 'A' ? 1 : (); } $rep->answer) {
+                               confess 'search recursively A record for '.$_.' failed';
+                       }
+               }
+       } @domains;
+
+       # Save domains
+       @{$self->{domains}} = @domains;
+
+       # Return class reference
+       return $self;
+}
+
+# Prepare environement
+sub prepare {
+       my ($self) = @_;
+
+       # Create all paths
+       make_path(CERT_DIR, KEY_DIR, PENDING_DIR.'/'.$self->{mail}.'.'.($self->{prod} ? 'prod' : 'staging'), {error => \my $err});
+       if (@$err) {
+               map {
+                       my ($file, $msg) = %$_;
+                       carp ($file eq '' ? '' : $file.': ').$msg if ($self->{debug});
+               } @$err;
+               confess 'make_path failed';
+       }
+
+       # Create user agent
+       $ua = LWP::UserAgent->new;
+       $ua->agent(__PACKAGE__.'/'.VERSION)
+}
+
+# Drop stderr
+sub _dropStdErr {
+       # Save stderr
+       open($_stderr, '>&STDERR') or die $!;
+       # Close it
+       close(STDERR) or die $!;
+       # Send to /dev/null
+       open(STDERR, '>', '/dev/null') or die $!;
+}
+
+# Restore stderr
+sub _restoreStdErr {
+       # Close stderr
+       close(STDERR);
+       # Open it back
+       open(STDERR, '>&', $_stderr) or die $!;
+}
+
+# Generate required keys
+sub genKeys {
+       my ($self) = @_;
+
+       # Generate account and server key if required
+       map {
+               # Check key existence
+               if (! -f $_) {
+                       # Drop stderr
+                       _dropStdErr();
+                       # Generate key
+                       #XXX: we drop stderr here because openssl can't be quiet on this command
+                       capturex('openssl', ('genrsa', '-out', $_, KEY_SIZE));
+                       # Restore stderr
+                       _restoreStdErr();
+               }
+       } (KEY_DIR.DS.ACCOUNT_KEY, KEY_DIR.DS.SERVER_KEY);
+
+       # Extract modulus and publicExponent jwk
+       #XXX: same here we tie to keep ordering
+       tie(%{$self->{account}}, 'Tie::IxHash', %jwk);
+       map {
+               if (/^Modulus=([0-9A-F]+)$/) {
+                       # Extract to binary from hex and convert to base64 url
+                       $self->{account}{jwk}{jwk}{n} = encode_base64url(pack("H*", $1) =~ s/^\0+//r);
+               } elsif (/^publicExponent:\s([0-9]+)\s\(0x[0-1]+\)$/) {
+                       # Extract to binary from int, trim leading zeros and convert to base64 url
+                       chomp ($self->{account}{jwk}{jwk}{e} = encode_base64url(pack("N", $1) =~ s/^\0+//r));
+               }
+       } capturex('openssl', ('rsa', '-text', '-in', KEY_DIR.DS.ACCOUNT_KEY, '-noout', '-modulus'));
+
+       # Drop stderr
+       _dropStdErr();
+       # Extract account public key
+       $self->{account}{pubkey} = join('', map { chomp; $_; } capturex('openssl', ('rsa', '-in', KEY_DIR.DS.ACCOUNT_KEY, '-pubout')));
+       # Restore stderr
+       _restoreStdErr();
+
+       # Store thumbprint
+       #XXX: convert base64 to base64 url
+       $self->{account}{thumbprint} = (sha256_base64(to_json($self->{account}{jwk}{jwk})) =~ s/=+\z//r) =~ tr[+/][-_]r;
+}
+
+# Generate certificate request
+sub genCsr {
+       my ($self) = @_;
+
+       # Openssl config template
+       my $oct = File::Temp->new();
+
+       # Load template from data
+       map { s/__EMAIL_ADDRESS__/$self->{mail}/; s/__COMMON_NAME__/$self->{domains}[0]/; print $oct $_; } <DATA>;
+
+       # Close data
+       close(DATA);
+
+       # Append domain names
+       my $i = 1;
+       map { print $oct 'DNS.'.$i++.' = '.$_."\n"; } @{$self->{domains}};
+
+       # Generate csr
+       capturex('openssl', ('req', '-new', '-outform', 'DER', '-key', KEY_DIR.DS.SERVER_KEY, '-config', $oct->filename, '-out', CERT_DIR.DS.REQUEST_CSR));
+
+       # Close oct
+       close($oct);
+}
+
+# Directory call
+sub directory {
+       my ($self) = @_;
+
+       # Set time
+       my $time = time;
+
+       # Set directory
+       my $dir = $self->{prod} ? ACME_PROD_DIR : ACME_DIR;
+
+       # Create a request
+       my $req = HTTP::Request->new(GET => $dir.'?'.$time);
+
+       # Get request
+       my $res = $ua->request($req);
+
+       # Handle error
+       unless ($res->is_success) {
+               confess 'GET '.$dir.'?'.$time.' failed: '.$res->status_line;
+       }
+
+       # Save nonce
+       $self->{nonce} = $res->headers->{'replay-nonce'};
+
+       # Merge uris in self content
+       %$self = (%$self, %{from_json($res->content)});
+}
+
+# Post request
+sub _post {
+       my ($self, $uri, $payload) = @_;
+
+       # Protected field
+       my $protected = encode_base64url(to_json({nonce => $self->{nonce}}));
+
+       # Payload field
+       $payload = encode_base64url(to_json($payload));
+
+       # Sign temp file
+       my $stf = File::Temp->new();
+
+       # Append protect.payload to stf
+       print $stf $protected.'.'.$payload;
+
+       # Close stf
+       close($stf);
+
+       # Generate digest of stf
+       my $signature = encode_base64url(join('', capturex('openssl', ('dgst', '-sha256', '-binary', '-sign', KEY_DIR.DS.ACCOUNT_KEY, $stf->filename))) =~ s/^\0+//r);
+
+       # Create a request
+       my $req = HTTP::Request->new(POST => $uri);
+       
+       # Set new-reg request content
+       $req->content(to_json({
+               header => $self->{account}{jwk},
+               protected => $protected,
+               payload => $payload,
+               signature => $signature
+       }));
+
+       # Post request
+       my $res = $ua->request($req);
+
+       # Save nonce
+       if (defined $res->headers->{'replay-nonce'}) {
+               $self->{nonce} = $res->headers->{'replay-nonce'};
+       }
+
+       # Return res object
+       return $res;
+}
+
+# Resolve dns and check content
+#XXX: see https://community.centminmod.com/threads/looks-like-letsencrypt-dns-01-is-ready.5845/#12 for example
+sub _dnsCheck {
+       my ($self, $domain, $token) = @_;
+
+       # Generate signature from content
+       my $signature = ((sha256_base64($token.'.'.$self->{account}{thumbprint})) =~ s/=+\z//r) =~ tr[+/][-_]r;
+
+       # Fix domain
+       $domain = '_acme-challenge.'.$domain.'.';
+
+       # Create resolver
+       my $res = new Net::DNS::Resolver();
+
+       # Check if we get dns answer
+       unless(my $rep = $res->search($domain, 'TXT')) {
+               carp 'TXT record search for '.$domain.' failed' if ($self->{debug});
+               return;
+       } else {
+               unless (scalar map { $_->type eq 'TXT' && $_->txtdata =~ /^$signature$/ ? 1 : (); } $rep->answer) {
+                       carp 'TXT record recursive search for '.$domain.' failed' if ($self->{debug});
+                       return;
+               }
+       }
+
+       return 1;
+}
+
+# Get uri and check content
+sub _httpCheck {
+       my ($self, $domain, $token) = @_;
+
+       # Create a request
+       my $req = HTTP::Request->new(GET => 'http://'.$domain.'/.well-known/acme-challenge/'.$token);
+
+       # Load config if available
+       my $config = undef;
+       if (
+               #XXX: use eval to workaround a fatal in from_json
+               defined eval {
+                       # Check that file exists
+                       -f CONFIG &&
+                       # Read it
+                       ($config = read_file(CONFIG)) &&
+                       # Decode it
+                       ($config = from_json($config)) &&
+                       # Check defined
+                       $config->{thumbprint}
+               }
+       ) {
+               # Try to write thumbprint
+               write_file($config->{thumbprint}, $self->{account}{thumbprint});
+       }
+
+       # Get request
+       my $res = $ua->request($req);
+
+       # Handle error
+       unless ($res->is_success) {
+               carp 'GET http://'.$domain.'/.well-known/acme-challenge/'.$token.' failed: '.$res->status_line if ($self->{debug});
+               return;
+       }
+
+       # Handle invalid content
+       unless($res->content =~ /^$token.$self->{account}{thumbprint}\s*$/) {
+               carp 'GET http://'.$domain.'/.well-known/acme-challenge/'.$token.' content match failed: /^'.$token.'.'.$self->{account}{thumbprint}.'\s*$/ !~ '.$res->content if ($self->{debug});
+               return;
+       }
+
+       # Return success
+       return 1;
+}
+
+# Register account
+#XXX: see doc at https://ietf-wg-acme.github.io/acme/#rfc.section.6.3
+sub register {
+       my ($self) = @_;
+
+       # Post new-reg request
+       #XXX: contact array may contain a tel:+33612345678 for example
+       my $res = $self->_post($self->{'new-reg'}, {resource => 'new-reg', contact => ['mailto:'.$self->{mail}], agreement => ACME_TERMS});
+
+       # Handle error
+       unless ($res->is_success || $res->code eq 409) {
+               confess 'POST '.$self->{'new-reg'}.' failed: '.$res->status_line;
+       }
+
+       # Update mail informations
+       if ($res->code eq 409) {
+               # Save registration uri
+               $self->{'reg'} = $res->headers->{location};
+
+               # Post reg request
+               #XXX: contact array may contain a tel:+33612345678 for example
+               $res = $self->_post($self->{'reg'}, {resource => 'reg', contact => ['mailto:'.$self->{mail}]});
+
+               # Handle error
+               unless ($res->is_success) {
+                       confess 'POST '.$self->{'reg'}.' failed: '.$res->status_line;
+               }
+       }
+}
+
+# Authorize domains
+sub authorize {
+       my ($self) = @_;
+
+       # Create challenges hash
+       %{$self->{challenges}} = ();
+
+       # Pending list
+       my @pending = ();
+
+       # Create or load auth request for each domain
+       map {
+               # Init content
+               my $content = undef;
+
+               # Init file
+               my $file = PENDING_DIR.'/'.$self->{mail}.'.'.($self->{prod} ? 'prod' : 'staging').'/'.$_;
+
+               # Load auth request content or post a new one
+               #TODO: add more check on cache file ???
+               if (
+                       #XXX: use eval to workaround a fatal in from_json
+                       ! defined eval {
+                               # Check that file exists
+                               -f $file &&
+                               # Read it
+                               ($content = read_file($file)) &&
+                               # Decode it
+                               ($content = from_json($content))
+                       # Check expiration
+                       } || (str2time($content->{expires}) <= time()+3600)
+               ) {
+                       # Post new-authz request
+                       my $res = $self->_post($self->{'new-authz'}, {resource => 'new-authz', identifier => {type => 'dns', value => $_}, existing => 'accept'});
+
+                       # Handle error
+                       unless ($res->is_success) {
+                               confess 'POST '.$self->{'new-authz'}.' for '.$_.' failed: '.$res->status_line;
+                       }
+
+                       # Decode content
+                       $content = from_json($res->content);
+
+                       # Check domain
+                       unless (defined $content->{identifier}{value} && $content->{identifier}{value} eq $_) {
+                               confess 'domain matching '.$content->{identifier}{value}.' for '.$_.' failed: '.$res->status_line;
+                       }
+
+                       # Check status
+                       unless ($content->{status} eq 'valid' or $content->{status} eq 'pending') {
+                               confess 'POST '.$self->{'new-authz'}.' for '.$_.' failed: '.$res->status_line;
+                       }
+
+                       # Write to file
+                       write_file($file, to_json($content));
+               }
+
+               # Add challenge
+               %{$self->{challenges}{$_}} = (
+                       status => $content->{status},
+                       expires => $content->{expires},
+                       polls => []
+               );
+
+               # Save pending data
+               if ($content->{status} eq 'pending') {
+                       # Extract validation data
+                       foreach my $challenge (@{$content->{challenges}}) {
+                               # One test already validated this auth request
+                               if ($self->{challenges}{$_}{status} eq 'valid') {
+                                       next;
+                               } elsif ($challenge->{status} eq 'valid') {
+                                       $self->{challenges}{$_}{status} = $challenge->{status};
+                                       next;
+                               } elsif ($challenge->{status} eq 'pending') {
+                                       # Handle check
+                                       if (
+                                               ($challenge->{type} =~ /^http-01$/ and $self->_httpCheck($_, $challenge->{token})) or
+                                               ($challenge->{type} =~ /^dns-01$/ and $self->_dnsCheck($_, $challenge->{token}))
+                                       ) {
+                                               # Post challenge request
+                                               my $res = $self->_post($challenge->{uri}, {resource => 'challenge', keyAuthorization => $challenge->{token}.'.'.$self->{account}{thumbprint}});
+
+                                               # Handle error
+                                               unless ($res->is_success) {
+                                                       confess 'POST '.$challenge->{uri}.' failed: '.$res->status_line;
+                                               }
+
+                                               # Extract content
+                                               my $content = from_json($res->content);
+
+                                               # Save if valid
+                                               if ($content->{status} eq 'valid') {
+                                                       $self->{challenges}{$_}{status} = $content->{status};
+                                               # Check is still polling
+                                               } elsif ($content->{status} eq 'pending') {
+                                                       # Add to poll list for later use
+                                                       push(@{$self->{challenges}{$_}{polls}}, {
+                                                               type => (split(/-/, $challenge->{type}))[0],
+                                                               status => $content->{status},
+                                                               poll => $content->{uri}
+                                                       });
+                                               }
+                                       }
+                               }
+                       }
+                       # Check if check is challenge still in pending and no polls
+                       if ($self->{challenges}{$_}{status} eq 'pending' && scalar @{$self->{challenges}{$_}{polls}} == 0) {
+                               # Loop on all remaining challenges
+                               foreach my $challenge (@{$content->{challenges}}) {
+                                       # Display help for http-01 check
+                                       if ($challenge->{type} eq 'http-01') {
+                                               print STDERR 'Create URI http://'.$_.'/.well-known/acme-challenge/'.$challenge->{token}.' with content '.$challenge->{token}.'.'.$self->{account}{thumbprint}."\n";
+                                       # Display help for dns-01 check
+                                       } elsif ($challenge->{type} eq 'dns-01') {
+                                               print STDERR 'Create TXT record _acme-challenge.'.$_.'. with value '.(((sha256_base64($challenge->{token}.'.'.$self->{account}{thumbprint})) =~ s/=+\z//r) =~ tr[+/][-_]r)."\n";
+                                       }
+                               }
+                       }
+               }
+       } @{$self->{domains}};
+
+       # Init max run
+       my $remaining = 10;
+
+       # Poll pending
+       while (--$remaining >= 0 and scalar map { $_->{status} eq 'valid' ? 1 : (); } values %{$self->{challenges}}) {
+               # Sleep
+               sleep(1);
+               # Poll remaining pending
+               map {
+                       # Init domain
+                       my $domain = $_;
+
+                       # Poll remaining polls
+                       map {
+                               # Create a request
+                               my $req = HTTP::Request->new(GET => $_->{poll});
+
+                               # Get request
+                               my $res = $ua->request($req);
+
+                               # Handle error
+                               unless ($res->is_success) {
+                                       carp 'GET '.$self->{challenges}{$_}{http_challenge}.' failed: '.$res->status_line if ($self->{debug});
+                               }
+
+                               # Extract content
+                               my $content = from_json($res->content);
+
+                               # Save status
+                               if ($content->{status} ne 'pending') {
+                                       $self->{challenges}{$domain}{status} = $content->{status};
+                               }
+                       } @{$self->{challenges}{$_}{polls}};
+               } map { $self->{challenges}{$_}{status} eq 'pending' ? $_ : (); } keys %{$self->{challenges}};
+       } 
+
+       # Load config if available
+       my $config = undef;
+       if (
+               #XXX: use eval to workaround a fatal in from_json
+               defined eval {
+                       # Check that file exists
+                       -f CONFIG &&
+                       # Read it
+                       ($config = read_file(CONFIG)) &&
+                       # Decode it
+                       ($config = from_json($config)) &&
+                       # Check defined
+                       $config->{thumbprint}
+               }
+       ) {
+               # Try to write thumbprint
+               write_file($config->{thumbprint}, '');
+       }
+
+       # Stop here with remaining chanllenge
+       if (scalar map { ! defined $_->{status} or $_->{status} ne 'valid' ? 1 : (); } values %{$self->{challenges}}) {
+               # Deactivate all activated domains 
+               #XXX: not implemented by letsencrypt
+               #map {
+               #       # Post deactivation request
+               #       my $res = $self->_post($self->{challenges}{$_}{http_uri}, {resource => 'authz', status => 'deactivated'});
+               #       # Handle error
+               #       unless ($res->is_success) {
+               #               confess 'POST '.$self->{challenges}{$_}{http_uri}.' failed: '.$res->status_line;
+               #       }
+               #} map { $self->{challenges}{$_}{status} eq 'valid' ? $_ : () } keys %{$self->{challenges}};
+
+               # Stop here as a domain of csr list failed authorization
+               if ($self->{debug}) {
+                       my @domains = map { ! defined $self->{challenges}{$_}{status} or $self->{challenges}{$_}{status} ne 'valid' ? $_ : (); } keys %{$self->{challenges}};
+                       confess 'Fix the challenge'.(scalar @domains > 1?'s':'').' for domain'.(scalar @domains > 1?'s':'').': '.join(', ', @domains);
+               } else {
+                       exit EXIT_FAILURE;
+               }
+       }
+}
+
+# Issue certificate
+sub issue {
+       my ($self) = @_;
+
+       # Open csr file
+       open(my $fh, '<', CERT_DIR.DS.REQUEST_CSR) or die $!;
+
+       # Load csr
+       my $csr = encode_base64url(join('', <$fh>) =~ s/^\0+//r);
+
+       # Close csr file
+       close($fh) or die $!;
+
+       # Post certificate request
+       my $res = $self->_post($self->{'new-cert'}, {resource => 'new-cert', csr => $csr});
+
+       # Handle error
+       unless ($res->is_success) {
+               confess 'POST '.$self->{'new-cert'}.' failed: '.$res->status_line;
+       }
+
+       # Open crt file
+       open($fh, '>', CERT_DIR.DS.SERVER_CRT) or die $!;
+
+       # Convert to pem
+       print $fh '-----BEGIN CERTIFICATE-----'."\n".encode_base64($res->content).'-----END CERTIFICATE-----'."\n";
+
+       # Create a request
+       my $req = HTTP::Request->new(GET => ACME_CERT);
+
+       # Get request
+       $res = $ua->request($req);
+
+       # Handle error
+       unless ($res->is_success) {
+               carp 'GET '.ACME_CERT.' failed: '.$res->status_line if ($self->{debug});
+       }
+
+       # Append content
+       print $fh $res->content;
+
+       # Close file
+       close($fh) or die $!;
+
+       # Print success
+       carp 'Success, pem certificate in '.CERT_DIR.DS.SERVER_CRT if ($self->{debug});
+}
+
+1;
+
+__DATA__
+#
+# OpenSSL configuration file.
+# This is mostly being used for generation of certificate requests.
+#
+
+[ req ]
+default_bits           = 2048
+default_md             = sha256
+prompt                 = no
+distinguished_name     = req_distinguished_name
+# The extentions to add to the self signed cert
+x509_extensions        = v3_ca
+# The extensions to add to a certificate request
+req_extensions = v3_req
+
+# This sets a mask for permitted string types. There are several options. 
+# utf8only: only UTF8Strings (PKIX recommendation after 2004).
+# WARNING: ancient versions of Netscape crash on BMPStrings or UTF8Strings.
+string_mask = utf8only
+
+[ req_distinguished_name ]
+countryName                    = US
+stateOrProvinceName            = State or Province Name
+localityName                   = Locality Name
+organizationName               = Organization Name
+organizationalUnitName         = Organizational Unit Name
+commonName                     = __COMMON_NAME__
+emailAddress                   = __EMAIL_ADDRESS__
+
+[ v3_req ]
+basicConstraints = CA:false
+keyUsage = nonRepudiation, digitalSignature, keyEncipherment
+subjectAltName = email:move
+subjectAltName = @alt_names
+
+[ v3_ca ]
+subjectKeyIdentifier = hash
+authorityKeyIdentifier = keyid:always,issuer
+basicConstraints = CA:true
+
+[alt_names]