From 29b96a13f83fcb95dac1d320cce071790fb98e0c Mon Sep 17 00:00:00 2001 From: Guilhem Moulin Date: Fri, 18 Dec 2015 01:40:56 +0100 Subject: =?UTF-8?q?acme-slave=20=E2=86=92=20client;=20acme-webserver=20?= =?UTF-8?q?=E2=86=92=20webserver?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- acme-slave | 269 ------------------------------------------------------------- 1 file changed, 269 deletions(-) delete mode 100755 acme-slave (limited to 'acme-slave') diff --git a/acme-slave b/acme-slave deleted file mode 100755 index 5cf0139..0000000 --- a/acme-slave +++ /dev/null @@ -1,269 +0,0 @@ -#!/usr/bin/perl -T - -#---------------------------------------------------------------------- -# Let's Encrypt ACME client -# Copyright © 2015 Guilhem Moulin -# -# 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 . -#---------------------------------------------------------------------- - -use strict; -use warnings; - -use LWP::UserAgent (); -use Crypt::OpenSSL::RSA (); -use Crypt::OpenSSL::Bignum (); -use MIME::Base64 qw/encode_base64 encode_base64url/; -use JSON (); -use Digest::SHA qw/sha256 sha256_hex/; - -# Clean up PATH -$ENV{PATH} = join ':', qw{/usr/bin /bin}; -delete @ENV{qw/IFS CDPATH ENV BASH_ENV/}; - -my $COMMAND = shift @ARGV // die; -my $PUBKEY = shift @ARGV // die; -die unless grep {$COMMAND eq $_} qw/new-reg new-cert revoke-cert/; -my $TIMEOUT = 10; - - -# Read the public key and build the JSON Web Key (RFC 7517) -my $JWK = do { - open my $fh, '<', $PUBKEY or die "Can't open $PUBKEY: $!"; - my $str = do { local $/ = undef; <$fh> }; - my $pubkey = Crypt::OpenSSL::RSA->new_public_key($str) or die; - close $fh; - - my ($n, $e) = $pubkey->get_key_parameters(); - $_ = encode_base64url($_->to_bin()) foreach ($n, $e); - - { kty => 'RSA', n => $n, e => $e } -}; -my $JSON = JSON::->new->utf8->canonical(); # breaks hashes otherwise -my $JWK_dgst64 = encode_base64url(sha256($JSON->encode($JWK))); -my $NONCE; - - -# Send an HTTP request to the ACME server -my $UA = LWP::UserAgent::->new( ssl_opts => { - verify_hostname => 1, - SSL_version => 'SSLv23:!TLSv1_1:!TLSv1:!SSLv3:!SSLv2', - SSL_cipher_list => 'EECDH+AESGCM:!MEDIUM:!LOW:!EXP:!aNULL:!eNULL' -}); -sub request($$;$) { - my ($method, $uri, $json) = @_; - print STDERR ">>> $method $uri <<<\n" if $ENV{DEBUG}; - - my $req = HTTP::Request::->new($method => $uri) or die "Can't $method $uri"; - if (defined $json) { - $req->header('Content-Type' => 'application/json'); - $req->content($JSON->encode($json)); - } - my $r = $UA->request($req) or die "Can't $method $uri"; - print STDERR ">>> ", $r->status_line, "\n", $r->headers->as_string, "\n" if $ENV{DEBUG}; - $NONCE = $r->header('Replay-Nonce') // die; - my $t = $r->header('Content-Type'); - - my $content = $r->decoded_content(); - if (defined $t and $t =~ /\Aapplication\/(?:[a-z]+\+)?json\z/) { - $content = $JSON->decode($content); - print STDERR $JSON->pretty->encode($content), "\n" if $ENV{DEBUG}; - } - elsif (defined $t and $t eq 'application/pkix-cert') { - print STDERR encode_base64($content), "\n" if $ENV{DEBUG}; - } - else { - print STDERR $content, "\n" if $ENV{DEBUG}; - } - unless ($r->is_success) { - my $msg = $r->status_line; - $msg .= " (".$content->{detail}.")" if ref $content and defined $content->{detail}; - die $msg, "\n"; - } - - return $content; -} - - -# ACME client -# https://tools.ietf.org/html/draft-ietf-acme-acme-01 -sub acme($$) { - my ($uri, $h) = @_; - - # Produce the JSON Web Signature: RFC 7515 section 5 - my $payload = encode_base64url($JSON->encode($h)); - my %header = ( alg => 'RS256', jwk => $JWK ); - my $protected = encode_base64url($JSON->encode({ %header, nonce => $NONCE })); - my $data = $protected .'.'. $payload; - print STDERR "Requesting a SHA-256 signature for ", $data, "\n" if $ENV{DEBUG}; - STDOUT->printflush($data, "\n"); - - # Ask for an (hex) sig - my $sig = do { local $_ = ; chomp; $_ }; - $sig = encode_base64url(pack('H*', $sig)); - print STDERR "Got SHA-256 signature ", $sig, "\n" if $ENV{DEBUG}; - - # Flattened JSON Serialization, RFC 7515 section 7.2.2 - request(POST => $uri, { - payload => $payload, - protected => $protected, - header => \%header, - signature => $sig - }); -} - - -# Query the root ACME directory to initialize the nonce and get the resources URIs -my %RES = %{ request(GET => "https://acme-v01.api.letsencrypt.org/directory") }; - - -if ($COMMAND eq 'new-reg') { - print STDERR "Requesting new registration ".(@ARGV ? ("for ".join(', ', @ARGV)) : "")."\n"; - my $uri = "https://letsencrypt.org/documents/LE-SA-v1.0.1-July-27-2015.pdf"; - my $dgst = sha256_hex($UA->get($uri)->decoded_content()); - die "Error: The CA's subscriber agreement (URL $uri) has changed!\n" if - $dgst ne '33d233c8ab558ba6c8ebc370a509acdded8b80e5d587aa5d192193f35226540f'; - - acme($RES{'new-reg'}, { - resource => 'new-reg', - contact => [ map {"mailto:$_"} @ARGV ], - agreement => $uri, - }); - exit; -} - - -if ($COMMAND eq 'revoke-cert') { - print STDERR "Requesting revocation for\n"; - for my $cert (@ARGV) { - open my $fh1, '-|', qw/openssl x509 -noout -subject -serial -fingerprint -sha256/, '-in', $cert - or die "Can't run x509(1ssl): $!"; - my ($subject, $serial, $fingerprint) = map { s/[^=]+=\s*//; chomp; $_ } <$fh1>; - close $fh1; - - print STDERR "\n\tSubject: $subject\n", - "\tSerial: $serial\n", - "\tSHA-256 fingerprint: $fingerprint\n"; - - open my $fh2, '-|', qw/openssl x509 -outform DER/, '-in', $cert or die "Can't run x509(1ssl): $!"; - my $der = do { local $/ = undef; <$fh2> }; - close $fh2; - - acme($RES{'revoke-cert'}, { - resource => 'revoke-cert', - certificate => encode_base64url($der) - }); - } - exit; -} - - -# $COMMAND eq 'new-cert' -my ($CSR, $CHALLENGE_DIR, $X509) = @ARGV; -$CHALLENGE_DIR = $CHALLENGE_DIR =~ /\A(\/\p{Print}+)\z/ ? $1 : - die "Error: Challenge directory is not absolute: $CHALLENGE_DIR"; - -# Parse the Certificate Signing Request -# XXX use a library instead, perhaps Crypt::OpenSSL::PKCS10 -my @domains = do { - my @req = (qw/openssl req -noout/, '-in', $CSR); - - 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)+/; - my %domains; - - open my $fh1, '-|', @req, '-subject' or die "Can't run req(1ssl): $!"; - my $subject = <$fh1>; - close $fh1; - $domains{$1} = 1 if $subject =~ /\Asubject=.*\/CN=($RE_domain)\n\z/o; - - open my $fh2, '-|', @req, '-text', '-reqopt', 'no_header,no_version,no_subject,no_pubkey,no_sigdump' - or die "Can't run req(1ssl): $!"; - while (<$fh2>) { - /\A\s+X509v3 Subject Alternative Name:/ or next; - my $san = <$fh2>; - foreach (split /,/, $san) { - chomp; - s/\A\s*//; - next unless s/\ADNS://; - if (/\A$RE_domain\z/o) { - $domains{$_} = 1; - } - else { - warn "WARNING: Ignoring invalid domain $_\n"; - } - } - last; - } - close $fh2; - - keys %domains; -}; -print STDERR "Found domain(s): ".join(", ", @domains), "\n" if $ENV{DEBUG}; - - -# Process DNS Authorizations -foreach my $domain (@domains) { - print STDERR "Processing new DNS authz for $domain\n" if $ENV{DEBUG}; - my $challenges = acme($RES{'new-authz'}, { - resource => 'new-authz', - identifier => { type => 'dns', value => $domain } - }); - die "No challenge in server response" unless defined $challenges->{challenges}; - my ($challenge) = grep {$_->{type} eq 'http-01'} @{$challenges->{challenges}}; - my $keyAuthorization = $challenge->{token}.'.'.$JWK_dgst64; - - # serve $keyAuthorization at http://$domain/.well-known/acme-challenge/$challenge->{token} - my $filename = $CHALLENGE_DIR.'/'.$challenge->{token}; - if (-e $filename) { - warn "WARNING: File exists: $filename\n"; - } - else { - open my $fh, '>', $filename or die "Can't open $filename: $!"; - print $fh $keyAuthorization; - close $fh; - } - - acme($challenge->{uri}, { - resource => 'challenge', - keyAuthorization => $keyAuthorization - }); - - for (my $i=0;; $i++) { - my $status = request('GET' => $challenge->{uri})->{status} // 'pending'; - die "Error: Invalid challenge for $domain\n" if $status eq 'invalid'; - last if $status eq 'valid'; - die "Timeout exceeded while waiting for challenge to pass ($domain)\n" if $i >= $TIMEOUT; - sleep 1; - } -} - - -do { - print STDERR "Processing new CSR\n" if $ENV{DEBUG}; - open my $fh1, '-|', qw/openssl req -outform DER/, '-in', $CSR or die "Can't run req(1ssl): $!"; - my $req = do { local $/ = undef; <$fh1> }; - close $fh1; - - # The server also gives the cert URI in its 'Location' header in - # https://acme-v01.api.letsencrypt.org/acme/cert/$serial - my $x509 = acme($RES{'new-cert'}, { - resource => 'new-cert', - csr => encode_base64url($req) - }); - - open my $fh2, '|-', qw/openssl x509 -inform DER/, '-out', $X509 or die "Can't run x509(1ssl): $!"; - print $fh2 $x509; - close $fh2; -}; -- cgit v1.2.3