lacme-0.2/000077500000000000000000000000001302130655100124305ustar00rootroot00000000000000lacme-0.2/COPYING000066400000000000000000001045131302130655100134670ustar00rootroot00000000000000 GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The GNU General Public License is a free, copyleft license for software and other kinds of works. The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. 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The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see . The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . lacme-0.2/Changelog000066400000000000000000000016461302130655100142510ustar00rootroot00000000000000lacme (0.2) upstream; + Honor Retry-After headers for certificate issuance and challenge responses. + Update example of Subscriber Agreement URL to v1.1.1. + lacme: automaticall spawn lacme-acountd when a "[accountd]" section is present in the configuration file. The "socket" option is then ignored, and the two processes communicate through a socket pair. + lacme: add an option --quiet to avoid mentioning valid certs (useful in cronjobs) + "config-certs" now points to a space separated list of files or directories. New default "lacme-certs.conf lacme-certs.conf.d/". - Minor manpage fixes - More useful message upon Validation Challenge failure. -- Guilhem Moulin Sat, 03 Dec 2016 16:40:56 +0100 lacme (0.1) upstream; * Initial public release. Development was started in December 2015. -- Guilhem Moulin Tue, 14 Jun 2016 17:30:58 +0200 lacme-0.2/INSTALL000066400000000000000000000031051302130655100134600ustar00rootroot00000000000000lacme-accountd depends on the following Perl modules: - Config::Tiny - Crypt::OpenSSL::RSA (for PEM-encoded key material) - Crypt::OpenSSL::Bignum (for PEM-encoded key material) - Errno (core module) - Getopt::Long (core module) - JSON (optionally C/XS-accelerated with JSON::XS) - List::Util (core module) - MIME::Base64 (core module) - Socket (core module) On Debian GNU/Linux systems, these dependencies can be installed with the following command: apt-get install libconfig-tiny-perl libcrypt-openssl-rsa-perl libcrypt-openssl-bignum-perl libjson-perl lacme depends on OpenSSL and the following Perl modules: - Config::Tiny - Digest::SHA (core module) - Errno (core module) - Fcntl (core module) - File::Temp (core module) - Getopt::Long (core module) - JSON (optionally C/XS-accelerated with JSON::XS) - List::Util (core module) - LWP::UserAgent - LWP::Protocol::https (for https:// ACME directory URIs) - MIME::Base64 (core module) - Net::SSLeay - POSIX (core module) - Socket (core module) On Debian GNU/Linux systems, these dependencies can be installed with the following command: apt-get install openssl libconfig-tiny-perl libjson-perl libwww-perl liblwp-protocol-https-perl libnet-ssleay-perl However Debian GNU/Linux users can also use gbp(1) from git-buildpackage to build their own package: $ git checkout debian $ AUTO_DEBSIGN=no gbp buildpackage Alternatively, for the development version: $ git checkout debian $ git merge master $ AUTO_DEBSIGN=no gbp buildpackage --git-force-create --git-upstream-tree=BRANCH lacme-0.2/Makefile000066400000000000000000000030261302130655100140710ustar00rootroot00000000000000MANPAGES = lacme-accountd.1 lacme.1 all: ${MANPAGES} # upper case the headers and remove the links %.1: %.md @pandoc -S -f markdown -t json "$<" | \ jq ".[1][] |= if .t == \"Header\" then .c[2][] |= (if .t == \"Str\" then .c |= ascii_upcase else . end) else . end" | \ jq " \ def fixit: \ if type == \"object\" then \ if .t == \"Link\" then \ if .c[2][0][0:7] == \"mailto:\" then . else .c[1][] end \ else \ map_values(fixit) \ end \ else if type == \"array\" then \ map(fixit) \ else \ . \ end \ end; \ map(fixit)" | \ pandoc -sS -f json -t man -o "$@" install: ${MANPAGES} install -d $(DESTDIR)/etc/lacme install -d $(DESTDIR)/etc/lacme/lacme-certs.conf.d install -m0644 -t $(DESTDIR)/etc/lacme config/*.conf install -d $(DESTDIR)/usr/share/lacme install -m0644 -t $(DESTDIR)/usr/share/lacme certs/lets-encrypt-x[1-4]-cross-signed.pem install -d $(DESTDIR)/usr/lib/lacme install -m0755 -t $(DESTDIR)/usr/lib/lacme client webserver install -d $(DESTDIR)/usr/share/man/man1 install -m0644 -t $(DESTDIR)/usr/share/man/man1 lacme-accountd.1 lacme.1 install -d $(DESTDIR)/usr/bin install -m0644 -t $(DESTDIR)/usr/bin lacme-accountd install -d $(DESTDIR)/usr/sbin install -m0644 -t $(DESTDIR)/usr/bin lacme clean: rm -vf ${MANPAGES} .PHONY: all install clean lacme-0.2/README000066400000000000000000000065141302130655100133160ustar00rootroot00000000000000lacme is a small ACME client written with process isolation and minimal privileges in mind. It is divided into four components, each with its own executable: * A process to manage the account key and issue SHA-256 signatures needed for each ACME command. (This process binds to a UNIX-domain socket to reply to signature requests from the ACME client.) One can use the UNIX-domain socket forwarding facility of OpenSSH 6.7 and later to run this process on a different host. * A "master" process, which runs as root and is the only component with access to the private key material of the server keys. It is used to fork the ACME client (and optionally the ACME webserver) after dropping root privileges. For certificate issuances, it also generates Certificate Signing Requests, then verifies the validity of the issued certificate, and optionally reloads or restarts services when the notify option is set. * An actual ACME client, which builds ACME commands and dialogues with the remote ACME server. Since ACME commands need to be signed with the account key, the "master" process passes the UNIX-domain socket of the account key manager to the ACME client: data signatures are requested by writing the data to be signed to the socket. * For certificate issuances, an optional webserver, which is spawned by the "master" process when no service is listening on the HTTP port. (The only challenge type currently supported is "http-01", which requires a webserver to answer challenges.) That webserver only processes GET and HEAD requests under the "/.well-known/acme-challenge/" URI. By default some iptables(8) rules are automatically installed to open the HTTP port, and removed afterwards. Consult the manuals for more information. https://guilhem.org/man/lacme.1.html https://guilhem.org/man/lacme-accountd.1.html _______________________________________________________________________ Requesting new Certificate Issuance with the ACME protocol generally works as follows: 1. Generate a Certificate Signing Request. This requires access to the private part of the server key. 2. Issue an issuance request against the ACME server. 3. Answer the ACME Identifier Validation Challenges. The challenge type "http-01" requires a webserver to listen on port 80 for each address for which an authorization request is issued; if there is no running webserver, root privileges are required to bind against port 80 and to install firewall rules to temporarily open the port. 4. Install the certificate (after verification) and restart the service. This usually requires root access as well. Steps 1,3,4 need to be run on the host for which an authorization request is issued. However the the issuance itself (step 2) could be done from another machine. Furthermore, each ACME command (step 2), as well as the key authorization token in step 3, need to be signed using an account key. The account key can be stored on another machine, or even on a smartcard. _______________________________________________________________________ lacme is Copyright© 2016 Guilhem Moulin ⟨guilhem@fripost.org⟩, and licensed for use under the GNU General Public License version 3 or later. See ‘COPYING’ for specific terms and distribution information. lacme-0.2/certs/000077500000000000000000000000001302130655100135505ustar00rootroot00000000000000lacme-0.2/certs/lets-encrypt-x1-cross-signed.pem000066400000000000000000000032131302130655100216270ustar00rootroot00000000000000-----BEGIN CERTIFICATE----- MIIEqDCCA5CgAwIBAgIRAJgT9HUT5XULQ+dDHpceRL0wDQYJKoZIhvcNAQELBQAw PzEkMCIGA1UEChMbRGlnaXRhbCBTaWduYXR1cmUgVHJ1c3QgQ28uMRcwFQYDVQQD Ew5EU1QgUm9vdCBDQSBYMzAeFw0xNTEwMTkyMjMzMzZaFw0yMDEwMTkyMjMzMzZa MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMTCCASIwDQYJKoZIhvcNAQEBBQAD ggEPADCCAQoCggEBAJzTDPBa5S5Ht3JdN4OzaGMw6tc1Jhkl4b2+NfFwki+3uEtB BaupnjUIWOyxKsRohwuj43Xk5vOnYnG6eYFgH9eRmp/z0HhncchpDpWRz/7mmelg PEjMfspNdxIknUcbWuu57B43ABycrHunBerOSuu9QeU2mLnL/W08lmjfIypCkAyG dGfIf6WauFJhFBM/ZemCh8vb+g5W9oaJ84U/l4avsNwa72sNlRZ9xCugZbKZBDZ1 gGusSvMbkEl4L6KWTyogJSkExnTA0DHNjzE4lRa6qDO4Q/GxH8Mwf6J5MRM9LTb4 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# # 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; # Usage: client COMMAND CONFIG_FD SOCKET_FD [ARGUMENTS] # # fdopen(3) the file descriptor SOCKET_FD (corresponding to the # listening lacme-accountd socket), connect(2) to it to retrieve the # account key's public parameters and later send data to be signed by # the master component (using the account key). # # CONFIG_FD is a read-only file descriptor associated with the # configuration file at pos 0. (This is needed since this process # doesn't know its name and might not have read access to it.) # # NOTE: one needs to chdir(2) to an appropriate ACME challenge directory # before running this program, since challenge tokens are (on purpose) # only written to the current directory. If COMMAND is challenge-less, # one should chdir(2) to the root directory "/" instead. # # NOTE: one should run this program as an unprivileged user:group such # as "nobody:nogroup"; bind(2)'ing to a restricted UNIX socket (for # instance own by another user and created with umask 0177) is not a # problem since SOCKET_FD can be bound as root prior to the execve(2). my $PROTOCOL_VERSION = 1; use LWP::UserAgent (); use MIME::Base64 qw/encode_base64 encode_base64url/; use JSON (); use Digest::SHA qw/sha256 sha256_hex/; use Config::Tiny (); # Clean up PATH $ENV{PATH} = join ':', qw{/usr/bin /bin}; delete @ENV{qw/IFS CDPATH ENV BASH_ENV/}; my $COMMAND = shift @ARGV // die; # Untaint and fdopen(3) the configuration file and listening socket (shift @ARGV // die) =~ /\A(\d+)\z/ or die; open my $CONFFILE, '<&=', $1 or die "fdopen $1: $!"; (shift @ARGV // die) =~ /\A(\d+)\z/ or die; open my $S, '+<&=', $1 or die "fdopen $1: $!"; ############################################################################# # Read the protocol version and JSON Web Key (RFC 7517) from the # lacme-accountd socket # die "Error: Invalid client version\n" unless $S->getline() =~ /\A(\d+) OK(?:.*)\r\n\z/ and $1 == $PROTOCOL_VERSION; my $JWK = JSON::->new->decode($S->getline()); # JSON keys need to be sorted lexicographically (for instance in the thumbprint) sub json() { JSON::->new->utf8->canonical(); } my $JWK_thumbprint = encode_base64url(sha256(json()->encode($JWK))); my $NONCE; ############################################################################# # Parse configuration (already validated by the master) and create the # LWP::UserAgent object # my $CONFIG = do { my $conf = do { local $/ = undef, <$CONFFILE> }; close $CONFFILE or die "Can't close: $!"; my $h = Config::Tiny::->read_string($conf) or die Config::Tiny::->errstr()."\n"; $h->{_} //= {}; $h->{client}->{$_} //= $h->{_}->{$_} foreach keys %{$h->{_}}; # add defaults $h->{client}; }; my $UA = do { my %args = %$CONFIG; my $verify = lc (delete $args{SSL_verify} // 'Yes') eq 'no' ? 0 : 1; my %ssl_opts = ( verify_hostname => $verify ); $ssl_opts{$_} = $args{$_} foreach grep /^SSL_/, keys %args; LWP::UserAgent::->new( ssl_opts => \%ssl_opts ); } // die "Can't create LWP::UserAgent object"; ############################################################################# # Send an HTTP request to the ACME server. If $json is defined, send # its encoding as the request content, with "application/json" as # Content-Type. # 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->content_type('application/json'); $req->content(json()->encode($json)); } my $r = $UA->request($req) or die "Can't $method $uri"; $NONCE = $r->header('Replay-Nonce'); # undef $NONCE if the header is missing print STDERR "[$$] >>> ", $r->status_line, "\n", $r->headers->as_string, "\n" if $ENV{DEBUG}; return $r; } # List all 'Links' headers with the relationship $rel (RFC 5988) sub request_link_rel($$) { my ($r, $rel) = @_; grep defined, map { /\A<([^>]+)>.*;\s*rel=([^;]+)/ ; my ($link, $rels) = ($1, $2 // '') ; (grep { $rel eq $_ } map { /^"(.*)"/ ? $1 : $_ } split(/\s+/, $rels)) ? $link : undef } $r->header('Link'); } # The request's Status Line; if the Content-Type is # application/problem+json, parse the decoded content as JSON and add # the value of the 'detail' field to the Status Line. # https://tools.ietf.org/html/draft-ietf-appsawg-http-problem sub request_status_line($) { my $r = shift; my $msg = $r->status_line; if ($r->content_type() eq 'application/problem+json') { my $content = json()->decode($r->decoded_content()); print STDERR json()->pretty->encode($content), "\n" if $ENV{DEBUG}; $msg .= " (".$content->{detail}.")" if defined $content->{detail}; } return $msg; } # Parse and return the request's decoded content as JSON; or print the # Status Line and fail if the request failed. # If $dump is set, also pretty-print the decoded content. sub request_json_decode($;$) { my $r = shift; my $dump = shift || $ENV{DEBUG}; die request_status_line($r), "\n" unless $r->is_success(); my $content = $r->decoded_content(); die "Content-Type: ".$r->content_type()." is not application/json\n" unless $r->content_type() eq 'application/json'; $content = json()->decode($content); print STDERR json()->pretty->encode($content), "\n" if $dump; return $content; } ############################################################################# # JSON-encode the hash reference $h and send it to the ACME server $uri # encapsulated it in a JSON Web Signature (JWS). # https://tools.ietf.org/html/draft-ietf-acme-acme # sub acme($$) { my ($uri, $h) = @_; # the ACME server MUST provide a Replay-Nonce header field in # response to a HEAD request for any valid resource request(HEAD => $uri) unless defined $NONCE; # 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; $S->printflush($data, "\r\n"); my $sig = $S->getline(); $sig =~ s/\r\n\z// or die; # Flattened JSON Serialization, RFC 7515 section 7.2.2 request(POST => $uri, { payload => $payload, protected => $protected, header => \%header, signature => $sig }); } my $SERVER_URI = $CONFIG->{server} // 'https://acme-v01.api.letsencrypt.org/'; $SERVER_URI .= '/' unless substr($SERVER_URI, -1, 1) eq '/'; my %RES; # Get the resource URI from the directory sub acme_resource($%) { my $r = shift; # Query the root ACME directory to initialize the nonce and get the resources URIs %RES = %{ request_json_decode(request(GET => $SERVER_URI.'directory')) } unless %RES; my $uri = $RES{$r} // die "Missing ressource for \"$r\"\n"; acme($uri, {resource => $r, @_}); } ############################################################################# # new-reg AGREEMENT_URI [CONTACT ..] # if ($COMMAND eq 'new-reg') { my $agreement = shift @ARGV; print STDERR "Requesting new registration ".(@ARGV ? ("for ".join(', ', @ARGV)) : "")."\n"; my %h = (contact => \@ARGV); $h{agreement} = $agreement if $agreement ne ''; my $r = acme_resource('new-reg', %h); my ($terms) = request_link_rel($r, 'terms-of-service'); request_json_decode($r,1) if $r->is_success() and $ENV{DEBUG}; # pretty-print the JSON print STDERR request_status_line($r), "\n"; print STDERR "Subscriber Agreement URI: $terms\n" if defined $terms; print STDERR "Registration URI: ", $r->header('Location'), "\n"; exit ($r->is_success() ? 0 : 1); } ############################################################################# # reg=URI AGREEMENT_URI [CONTACT ..] # elsif ($COMMAND =~ /\Areg=(\p{Print}+)\Z/) { die "Empty registration URI (use the 'new-reg' command to determine the URI)\n" if $1 eq ''; my $uri = $SERVER_URI.$1; my $agreement = shift @ARGV; my %h = (resource => 'reg'); $h{agreement} = $agreement if $agreement ne ''; $h{contact} = \@ARGV if @ARGV; # don't empty the contact list my $r = acme($uri, \%h); my ($terms) = request_link_rel($r, 'terms-of-service'); $r->is_success() ? request_json_decode($r,1) # pretty-print the JSON : print STDERR request_status_line($r), "\n"; print STDERR "Subscriber Agreement URI: $terms\n" if defined $terms; exit ($r->is_success() ? 0 : 1); } ############################################################################# # new-cert AUTHZ [AUTHZ ..] # Read the CSR (in DER format) from STDIN, print the cert (in PEM format # to STDOUT) # elsif ($COMMAND eq 'new-cert') { die unless @ARGV; my $timeout = $CONFIG->{timeout} // 10; foreach my $domain (@ARGV) { print STDERR "Processing new DNS authz for $domain\n" if $ENV{DEBUG}; my $r = acme_resource('new-authz', identifier => {type => 'dns', value => $domain}); my ($challenge) = grep {$_->{type} eq 'http-01'} @{request_json_decode($r)->{challenges} // []}; die "Missing 'http-01' challenge in server response" unless defined $challenge; die "Invalid challenge token ".($challenge->{token} // '')."\n" unless ($challenge->{token} // '') =~ /\A[A-Za-z0-9_\-]+\z/; my $keyAuthorization = $challenge->{token}.'.'.$JWK_thumbprint; # serve $keyAuthorization at http://$domain/.well-known/acme-challenge/$challenge->{token} if (-e $challenge->{token}) { print STDERR "WARNING: File exists: $challenge->{token}\n"; } else { open my $fh, '>', $challenge->{token} or die "Can't open $challenge->{token}: $!"; $fh->print($keyAuthorization); $fh->close() or die "Can't close: $!"; } $r = acme($challenge->{uri}, { resource => 'challenge', keyAuthorization => $keyAuthorization }); # wait until the status become 'valid' for ( my $i = 0, my $content, my $status; $content = request_json_decode($r), $status = $content->{status} // 'pending', $status ne 'valid'; $r = request('GET' => $challenge->{uri})) { if (defined (my $problem = $content->{error})) { # problem document (RFC 7807) my $msg = $problem->{status}; $msg .= " " .$problem->{title} if defined $problem->{title}; $msg .= " (".$problem->{detail}.")" if defined $problem->{detail}; die $msg, "\n"; } die "Error: Invalid challenge for $domain (status: ".$status.")\n" if $status ne 'pending'; my $sleep = 1; if (defined (my $retry_after = $r->header('Retry-After'))) { print STDERR "Retrying after $retry_after seconds...\n"; $sleep = $retry_after; } $i += $sleep; die "Timeout exceeded while waiting for challenge to pass ($domain)\n" if $timeout > 0 and $i >= $timeout; sleep $sleep; } } my $csr = do { local $/ = undef; }; my $r = acme_resource('new-cert', csr => encode_base64url($csr)); die request_status_line($r), "\n" unless $r->is_success(); my $uri = $r->header('Location'); # https://acme-v01.api.letsencrypt.org/acme/cert/$serial print STDERR "Certificate URI: $uri\n"; if ($r->decoded_content() eq '') { # wait for the cert for (my $i = 0;;) { $r = request('GET' => $uri); die request_status_line($r), "\n" unless $r->is_success(); last unless $r->code == 202; # Accepted my $retry_after = $r->header('Retry-After') // 1; print STDERR "Retrying after $retry_after seconds...\n"; $i += $retry_after; die "Timeout exceeded while waiting for certificate\n" if $timeout > 0 and $i >= $timeout; sleep $retry_after; } } my $der = $r->decoded_content(); # conversion DER -> PEM pipe my $rd, my $wd or die "Can't pipe: $!"; my $pid = fork // die "Can't fork: $!"; unless ($pid) { open STDIN, '<&', $rd or die "Can't dup: $!"; exec qw/openssl x509 -inform DER -outform PEM/ or die; } $rd->close() or die "Can't close: $!"; $wd->print($der); $wd->close() or die "Can't close: $!"; waitpid $pid => 0; die $? if $? > 0; } ############################################################################# # revoke-cert # The certificate to revoke is passed (in DER format) to STDIN; this # is required since the ACME client might not have read access to the # X.509 file # elsif ($COMMAND eq 'revoke-cert') { die if @ARGV; my $der = do { local $/ = undef; }; close STDIN or die "Can't close: $!"; my $r = acme_resource('revoke-cert', certificate => encode_base64url($der)); exit 0 if $r->is_success(); die request_status_line($r), "\n"; } lacme-0.2/config/000077500000000000000000000000001302130655100136755ustar00rootroot00000000000000lacme-0.2/config/lacme-accountd.conf000066400000000000000000000017121302130655100174240ustar00rootroot00000000000000# The value of "privkey" specifies the (private) account key to use # for signing requests. Currently supported values are: # # - file:FILE, to specify an encrypted private key (in PEM format) # - gpg:FILE, to specify a gpg-encrypted private key (in PEM format) # #privkey = gpg:/path/to/encrypted/account.key.gpg #privkey = file:/path/to/account.key # For a gpg-encrypted private account key, "gpg" specifies the binary # gpg(1) to use, as well as some default options. Default: "gpg # --quiet". # #gpg = gpg --quiet --no-auto-check-trustdb # The value of "socket" specifies the UNIX-domain socket to bind against # for signature requests from the ACME client. An error is raised if # the path exists or if its parent directory is writable by other # users. # Default: "$XDG_RUNTIME_DIR/S.lacme" if the XDG_RUNTIME_DIR # environment variable is set. # #socket = /run/user/1000/S.lacme # Be quiet. Possible values: "Yes"/"No". # #quiet = Yes ; vim:ft=dosini lacme-0.2/config/lacme-certs.conf000066400000000000000000000036021302130655100167440ustar00rootroot00000000000000# Each non-default section refer to separate certificate issuance # requests. Options in the default section apply to each sections. # Message digest to sign the Certificate Signing Request with. # #hash = sha512 # Comma-separated list of Key Usages, see x509v3_config(5ssl). # #keyUsage = digitalSignature, keyEncipherment #[www] # Path the service's private key. This option is required. # #certificate-key = /etc/nginx/ssl/srv.key # Where to store the issued certificate (in PEM format). # #certificate = /etc/nginx/ssl/srv.pem # Where to store the issued certificate, concatenated with the content # of the file specified specified with the CAfile option (in PEM format). # #certificate-chain = /etc/nginx/ssl/srv.chain.pem # For an existing certificate, the minimum number of days before its # expiration date the section is considered for re-issuance. # #min-days = 10 # Path to the issuer's certificate. This is used for certificate-chain # and to verify the validity of each issued certificate. Specifying an # empty value skip certificate validation. # #CAfile = /usr/share/lacme/lets-encrypt-x3-cross-signed.pem # Subject field of the Certificate Signing Request. This option is # required. # #subject = /CN=example.org # Comma-separated list of Subject Alternative Names. # #subjectAltName = DNS:example.org,DNS:www.example.org # username[:groupname] to chown the issued certificate and # certificate-chain with. # #chown = root:root # Octal mode to chmod the issued certificate and certificate-chain with. # #chmod = 0644 # Command to pass the the system's command shell ("/bin/sh -c") after # successful installation of the certificate and/or certificate-chain. # #notify = /bin/systemctl reload nginx #[smtp] #certificate-key = /etc/postfix/ssl/srv.key #certificate-chain = /etc/postfix/ssl/srv.pem #subject = /CN=smtp.example.org #notify = /bin/systemctl reload postfix ; vim:ft=dosini lacme-0.2/config/lacme.conf000066400000000000000000000075401302130655100156330ustar00rootroot00000000000000# For certificate issuance (new-cert command), specify a space-separated # certificate configuration files or directories to use # #config-certs = lacme-certs.conf lacme-certs.conf.d/ [client] # The value of "socket" specifies the path to the lacme-accountd(1) # UNIX-domain socket to connect to for signature requests from the ACME # client. lacme(1) aborts if the socket is readable or writable by # other users, or if its parent directory is writable by other users. # Default: "$XDG_RUNTIME_DIR/S.lacme" if the XDG_RUNTIME_DIR environment # variable is set. # This option is ignored when lacme-accountd(1) is spawned by lacme(1), # since the two processes communicate through a socket pair. See the # "accountd" section below for details. # #socket = /run/user/1000/S.lacme # username to drop privileges to (setting both effective and real uid). # Preserve root privileges if the value is empty (not recommended). # Default: "nobody". # #user = lacme # groupname to drop privileges to (setting both effective and real gid, # and also setting the list of supplementary gids to that single group). # Preserve root privileges if the value is empty (not recommended). # Default: "nogroup". # #group = nogroup # Path to the ACME client executable. # #command = /usr/lib/lacme/client # Root URI of the ACME server. NOTE: Use the staging server for testing # as it has relaxed rate-limiting. # #server = https://acme-v01.api.letsencrypt.org/ #server = https://acme-staging.api.letsencrypt.org/ # Timeout in seconds after which the client stops polling the ACME # server and considers the request failed. # #timeout = 10 # Whether to verify the server certificate chain. # #SSL_verify = yes # Specify the version of the SSL protocol used to transmit data. # #SSL_version = SSLv23:!TLSv1_1:!TLSv1:!SSLv3:!SSLv2 # Specify the cipher list for the connection. # #SSL_cipher_list = EECDH+AESGCM:!MEDIUM:!LOW:!EXP:!aNULL:!eNULL [webserver] # Specify the local address to listen on, in the form ADDRESS[:PORT]. # #listen = 0.0.0.0:80 #listen = [::]:80 # If a webserver is already running, specify a non-existent directory # under which the webserver is configured to serve GET requests for # challenge files under "/.well-known/acme-challenge/" (for each virtual # hosts requiring authorization) as static files. # #challenge-directory = /var/www/acme-challenge # username to drop privileges to (setting both effective and real uid). # Preserve root privileges if the value is empty (not recommended). # #user = www-data # groupname to drop privileges to (setting both effective and real gid, # and also setting the list of supplementary gids to that single group). # Preserve root privileges if the value is empty (not recommended). # #group = www-data # Path to the ACME webserver executable. # #command = /usr/lib/lacme/webserver # Whether to automatically install iptables(8) rules to open the # ADDRESS[:PORT] specified with listen. Theses rules are automatically # removed once lacme(1) exits. # #iptables = Yes [accountd] # lacme-accound(1) section. Comment out this section (including its # header) to make lacme(1) connect to an existing UNIX-domain socket # bound by a running acme-accountd(1) process. # username to drop privileges to (setting both effective and real uid). # Preserve root privileges if the value is empty. # #user = root # groupname to drop privileges to (setting both effective and real gid, # and also setting the list of supplementary gids to that single group). # Preserve root privileges if the value is empty. # #group = root # Path to the lacme-accountd(1) executable. # #command = /usr/bin/lacme-accountd # Path to the lacme-accountd(1) configuration file. # #config = /etc/lacme/lacme-accountd.conf # The (private) account key to use for signing requests. See # lacme-accountd(1) for details. # #privkey = file:/path/to/account.key # Be quiet. # #quiet = Yes ; vim:ft=dosini lacme-0.2/lacme000077500000000000000000000730741302130655100134520ustar00rootroot00000000000000#!/usr/bin/perl -T #---------------------------------------------------------------------- # ACME client written with process isolation and minimal privileges in mind # Copyright © 2016 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; 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 my $CONFFILENAME = $OPTS{config} // first { -f $_ } ( "./$NAME.conf" , ($ENV{XDG_CONFIG_HOME} // "$ENV{HOME}/.config")."/lacme/$NAME.conf" , "/etc/lacme/$NAME.conf" ); do { die "Error: Can't find configuration file\n" unless defined $CONFFILENAME; print STDERR "Using configuration file: $CONFFILENAME\n" if $OPTS{debug}; open $CONFFILE, '<', $CONFFILENAME or die "Can't open $CONFFILENAME: $!\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 $conffiles = defined $OPTS{'config-certs'} ? $OPTS{'config-certs'} : defined $CONFIG->{_}->{'config-certs'} ? [ split(/\s+/, $CONFIG->{_}->{'config-certs'}) ] : [ "$NAME-certs.conf", "$NAME-certs.conf.d/" ]; my $conf; foreach my $conffile (@$conffiles) { $conffile = ($CONFFILENAME =~ s#[^/]+\z##r).$conffile unless $conffile =~ /\A\//; my @filenames; unless ($conffile =~ s#/\z## or -d $conffile) { @filenames = ($conffile); } else { opendir my $dh, $conffile or die "Can't opendir $conffile: $!\n"; while (readdir $dh) { if (/\.conf\z/) { push @filenames, "$conffile/$_"; } elsif ($_ ne '.' and $_ ne '..') { warn "$conffile/$_ has unknown suffix, skipping\n"; } } closedir $dh; } foreach my $filename (sort @filenames) { print STDERR "Reading $filename\n" if $OPTS{debug}; my $h = Config::Tiny::->read($filename) 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; } lacme-0.2/lacme-accountd000077500000000000000000000175011302130655100152410ustar00rootroot00000000000000#!/usr/bin/perl -T #---------------------------------------------------------------------- # ACME client written with process isolation and minimal privileges in mind # (account key manager) # Copyright © 2016 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; our $VERSION = '0.0.1'; my $PROTOCOL_VERSION = 1; my $NAME = 'lacme-accountd'; use Errno 'EINTR'; use Getopt::Long qw/:config posix_default no_ignore_case gnu_getopt auto_version/; use List::Util 'first'; use MIME::Base64 'encode_base64url'; use Socket qw/PF_UNIX SOCK_STREAM SHUT_RDWR/; use Config::Tiny (); use JSON (); # Clean up PATH $ENV{PATH} = join ':', qw{/usr/bin /bin}; delete @ENV{qw/IFS CDPATH ENV BASH_ENV/}; my ($SOCKNAME, $S, %OPTS); $SIG{$_} = sub() { exit } 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] [--privkey=ARG] [--socket=PATH] [--quiet]\n" ."Consult the manpage for more information.\n"; } exit $rv; } usage(1) unless GetOptions(\%OPTS, qw/config=s privkey=s socket=s conn-fd=i quiet|q debug help|h/); usage(0) if $OPTS{help}; 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}; my $h = Config::Tiny::->read($conffile) or die Config::Tiny::->errstr()."\n"; my $h2 = delete $h->{_} // {}; die "Invalid section(s): ".join(', ', keys %$h)."\n" if %$h; my %h = map { $_ => delete $h2->{$_} } qw/privkey gpg socket quiet/; die "Unknown option(s): ".join(', ', keys %$h2)."\n" if %$h2; $h{quiet} = lc $h{quiet} eq 'yes' ? 1 : 0 if defined $h{quiet}; $OPTS{$_} //= $h{$_} foreach grep {defined $h{$_}} keys %h; $OPTS{quiet} = 0 if $OPTS{debug}; die "Error: 'privkey' is not specified\n" unless defined $OPTS{privkey}; }; ############################################################################# # Build the JSON Web Key (RFC 7517) from the account key's public parameters, # and determine the signing method $SIGN. # my ($JWK, $SIGN); if ($OPTS{privkey} =~ /\A(file|gpg):(\p{Print}+)\z/) { my ($method, $filename) = ($1,$2); my ($fh, @command); if ($method eq 'file') { # generate with `openssl genrsa 4096 | install --mode=0600 /dev/stdin /tmp/privkey` open $fh, '<', $filename or die "Error: Can't open $filename: $!\n"; } elsif ($method eq 'gpg') { @command = split /\s+/, ($OPTS{gpg} // 'gpg --quiet'); open $fh, '-|', @command, qw/-o - --decrypt --/, $filename or die "fork: $!"; } else { die; # impossible } my $str = do {local $/ = undef; <$fh>}; close $fh or die $! ? "Can't close: $!" : "Error: $command[0] exited with value ".($? >> 8)."\n"; require 'Crypt/OpenSSL/RSA.pm'; my $rsa = Crypt::OpenSSL::RSA->new_private_key($str); undef $str; die "Error: $filename: Not a private key\n" unless $rsa->is_private(); die "Error: $filename: Invalid key\n" unless $rsa->check_key(); $rsa->use_sha256_hash(); require 'Crypt/OpenSSL/Bignum.pm'; my ($n, $e) = $rsa->get_key_parameters(); # don't include private params! $_ = encode_base64url($_->to_bin()) foreach ($n, $e); $JWK = { kty => 'RSA', n => $n, e => $e }; $SIGN = sub($) { $rsa->sign($_[0]) }; } else { die "Error: unsupported method: $OPTS{privkey}\n"; } $JWK = JSON::->new->encode($JWK); ############################################################################# # Create the server UNIX socket and bind(2) against it. # NOTE: We don't use the abstract namespace so we can rely on the file # permissions to keep other users out. (Also, OpenSSH 7.1 doesn't seem # to support the abstract namespace.) The downside is that we have to # delete the file manually. # if (defined $OPTS{'conn-fd'}) { die "Invalid file descriptor" unless $OPTS{'conn-fd'} =~ /\A(\d+)\z/; # untaint and fdopen(3) our end of the socket pair open $S, '+<&=', $1 or die "fdopen $1: $!"; } else { my $sockname = $OPTS{socket} // (defined $ENV{XDG_RUNTIME_DIR} ? "$ENV{XDG_RUNTIME_DIR}/S.lacme" : undef); die "Missing socket option\n" unless defined $sockname; $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; my @stat = stat($dirname) or die "Can't stat $dirname: $!"; die "Error: insecure permissions on $dirname\n" if ($stat[2] & 0022) != 0; my $umask = umask(0177) // die "umask: $!"; print STDERR "Starting lacme Account Key Manager at $sockname\n" unless $OPTS{quiet}; socket(my $sock, PF_UNIX, SOCK_STREAM, 0) or die "socket: $!"; my $sockaddr = Socket::sockaddr_un($sockname) // die; bind($sock, $sockaddr) or die "bind: $!"; ($SOCKNAME, $S) = ($sockname, $sock); listen($S, 1) or die "listen: $!"; umask($umask) // die "umask: $!"; }; ############################################################################# # For each new connection, send the protocol version and the account key's # public parameters, then sign whatever comes in # sub conn($;$) { my $conn = shift; my $count = shift; $conn->printflush( "$PROTOCOL_VERSION OK", "\r\n", $JWK, "\r\n" ); # sign whatever comes in while (defined (my $data = $conn->getline())) { $data =~ s/\r\n\z// or die; print STDERR "[$count] >>> Issuing SHA-256 signature for: $data\n" unless $OPTS{quiet}; my $sig = $SIGN->($data); $conn->printflush( encode_base64url($sig), "\r\n" ); } } if (defined $OPTS{'conn-fd'}) { conn($S, $$); } else { $SIG{PIPE} = 'IGNORE'; # ignore broken pipes for (my $count = 0;; $count++) { accept(my $conn, $S) or do { next if $! == EINTR; # try again if accept(2) was interrupted by a signal die "accept: $!"; }; print STDERR "[$count] >>> Accepted new connection\n" unless $OPTS{quiet}; conn($conn, $count); print STDERR "[$count] >>> Connection terminated\n" unless $OPTS{quiet}; close $conn or warn "Can't close: $!"; } } ############################################################################# # END { if (defined $SOCKNAME and -S $SOCKNAME) { print STDERR "Unlinking $SOCKNAME\n" if $OPTS{debug}; unlink $SOCKNAME or print STDERR "Can't unlink $SOCKNAME: $!\n"; } if (defined $S) { print STDERR "Shutting down and closing lacme Account Key Manager\n" unless $OPTS{quiet}; shutdown($S, SHUT_RDWR) or warn "shutdown: $!"; close $S or print STDERR "Can't close: $!\n"; } } lacme-0.2/lacme-accountd.md000066400000000000000000000103171302130655100156330ustar00rootroot00000000000000% lacme-accountd(1) % [Guilhem Moulin](mailto:guilhem@fripost.org) % March 2016 Name ==== lacme-accountd - [ACME] client written with process isolation and minimal privileges in mind (account key manager) Synopsis ======== `lacme-accountd` [`--config=FILENAME`] [`--privkey=ARG`] [`--socket=PATH`] [`--quiet`] Description =========== `lacme-accountd` is the account key manager component of [`lacme`(1)], a small [ACME] client written with process isolation and minimal privileges in mind. No other [`lacme`(1)] component needs access to the account key; in fact the account key could as well be stored on another host or a smartcard. `lacme-accountd` binds to a UNIX-domain socket (specified with `--socket=`), which [ACME] clients can connect to in order to request data signatures. As a consequence, `lacme-accountd` needs to be up and running before using [`lacme`(1)] to issue [ACME] commands. Also, the process does not automatically terminate after the last signature request: instead, one sends an `INT` or `TERM` [`signal`(7)] to bring the server down. Furthermore, one can use the UNIX-domain socket forwarding facility of [OpenSSH] 6.7 and later to run `lacme-accountd` and [`lacme`(1)] on different hosts. For instance one could store the account key on a machine that is not exposed to the internet. See the **[examples](#examples)** section below. Options ======= `--config=`*filename* : Use *filename* as configuration file. See the **[configuration file](#configuration-file)** section below for the configuration options. `--privkey=`*arg* : Specify the (private) account key to use for signing requests. Currently supported *arg*uments are: * `file:`*FILE*, to specify an encrypted private key (in PEM format); and * `gpg:`*FILE*, to specify a [`gpg`(1)]-encrypted private key (in PEM format). The following command can be used to generate a new 4096-bits RSA key in PEM format with mode 0600: openssl genrsa 4096 | install -m0600 /dev/stdin /path/to/account.key `--socket=`*path* : Use *path* as the UNIX-domain socket to bind against for signature requests from the [ACME] client. `lacme-accountd` aborts if *path* exists or if its parent directory is writable by other users. `-h`, `--help` : Display a brief help and exit. `-q`, `--quiet` : Be quiet. `--debug` : Turn on debug mode. Configuration file ================== If `--config=` is not given, `lacme-accountd` uses the first existing configuration file among *./lacme-accountd.conf*, *$XDG_CONFIG_HOME/lacme/lacme-accountd.conf* (or *~/.config/lacme/lacme-accountd.conf* if the `XDG_CONFIG_HOME` environment variable is not set), and */etc/lacme/lacme-accountd.conf*. When given on the command line, the `--privkey=`, `--socket=` and `--quiet` options take precedence over their counterpart (without leading `--`) in the configuration file. Valid options are: *privkey* : See `--privkey=`. This option is required when `--privkey=` is not specified on the command line. *gpg* : For a [`gpg`(1)]-encrypted private account key, specify the binary [`gpg`(1)] to use, as well as some default options. Default: `gpg --quiet`. *socket* : See `--socket=`. Default: *$XDG_RUNTIME_DIR/S.lacme* if the `XDG_RUNTIME_DIR` environment variable is set. *quiet* : Be quiet. Possible values: `Yes`/`No`. Examples ======== Run `lacme-accountd` in a first terminal: ~$ lacme-accountd --privkey=file:/path/to/account.key --socket=$XDG_RUNTIME_DIR/S.lacme Then, while `lacme-accountd` is running, execute locally [`lacme`(1)] in another terminal: ~$ sudo lacme --socket=$XDG_RUNTIME_DIR/S.lacme new-cert Alternatively, use [OpenSSH] 6.7 or later to forward the socket and execute [`lacme`(1)] remotely: ~$ ssh -oExitOnForwardFailure=yes -tt -R /path/to/remote.sock:$XDG_RUNTIME_DIR/S.lacme user@example.org \ sudo lacme --socket=/path/to/remote.sock new-cert See also ======== [`lacme`(1)], [`ssh`(1)] [ACME]: https://tools.ietf.org/html/draft-ietf-acme-acme-02 [`lacme`(1)]: lacme.1.html [`signal`(7)]: http://linux.die.net/man/7/signal [`gpg`(1)]: https://www.gnupg.org/documentation/manpage.en.html [OpenSSH]: http://www.openssh.com/ [`ssh`(1)]: http://man.openbsd.org/ssh lacme-0.2/lacme.md000066400000000000000000000321171302130655100140370ustar00rootroot00000000000000% lacme(1) % [Guilhem Moulin](mailto:guilhem@fripost.org) % December 2015 Name ==== lacme - [ACME] client written with process isolation and minimal privileges in mind Synopsis ======== `lacme` [`--config=FILENAME`] [`--socket=PATH`] [*OPTION* …] *COMMAND* [*ARGUMENT* …] Description =========== `lacme` is a small [ACME] client written with process isolation and minimal privileges in mind. It is divided into four components, each with its own executable: 1. A [`lacme-accountd`(1)] process to manage the account key and issue SHA-256 signatures needed for each [ACME] command. (This process binds to a UNIX-domain socket to reply to signature requests from the [ACME] client.) One can use the UNIX-domain socket forwarding facility of OpenSSH 6.7 and later to run [`lacme-accountd`(1)] and `lacme` on different hosts. Alternatively, the [`lacme-accountd`(1)] process can be spawned by the “master” `lacme` process below; in that case, the two processes communicate through a socket pair. 2. A “master” `lacme` process, which runs as root and is the only component with access to the private key material of the server keys. It is used to fork the [ACME] client (and optionally the [ACME] webserver) after dropping root privileges. For certificate issuances (`new-cert` command), it also generates Certificate Signing Requests, then verifies the validity of the issued certificate, and optionally reloads or restarts services when the *notify* option is set. 3. An actual [ACME] client (specified with the *command* option of the [`[client]` section](#client-section) of the configuration file), which builds [ACME] commands and dialogues with the remote [ACME] server. Since [ACME] commands need to be signed with the account key, the “master” `lacme` process passes the [`lacme-accountd`(1)] UNIX-domain socket to the [ACME] client: data signatures are requested by writing the data to be signed to the socket. 4. For certificate issuances (`new-cert` command), an optional webserver (specified with the *command* option of the [`[webserver]` section](#webserver-section) of the configuration file), which is spawned by the “master” `lacme` process when no service is listening on the HTTP port. (The only challenge type currently supported by `lacme` is `http-01`, which requires a webserver to answer challenges.) That webserver only processes `GET` and `HEAD` requests under the `/.well-known/acme-challenge/` URI. By default some [`iptables`(8)] rules are automatically installed to open the HTTP port, and removed afterwards. Commands ======== `lacme` [`--agreement-uri=`*URI*] `new-reg` [*CONTACT* …] : Register the account key managed by [`lacme-accountd`(1)]. A list of *CONTACT* information (such as `maito:` URIs) can be specified in order for the server to contact the client for issues related to this registration (such as notifications about server-initiated revocations). `--agreement-uri=` can be used to specify a *URI* referring to a subscriber agreement or terms of service provided by the server; adding this options indicates the client's agreement with the referenced terms. Note that the server might require the client to agree to subscriber agreement before performing any further actions. If the account key is already registered, `lacme` prints the URI of the existing registration and aborts. `lacme` [`--agreement-uri=`*URI*] `reg=`*URI* [*CONTACT* …] : Dump or edit the registration *URI* (relative to the [ACME] server URI, which is specified with the *server* option of the [`[client]` section](#client-section) of the configuration file). When specified, the list of *CONTACT* information and the agreement *URI* are sent to the server to replace the existing values. `lacme` [`--config-certs=`*FILE*] `new-cert` [*SECTION* …] : Read the certificate configuration *FILE* (see the **[certificate configuration file](#certificate-configuration-file)** section below for the configuration options), and request new Certificate Issuance for each of its sections (or the given list of *SECTION*s). `lacme` `revoke-cert` *FILE* [*FILE* …] : Request that the given certificate(s) *FILE*(s) be revoked. For this command, [`lacme-accountd`(1)] can be pointed to either the account key or the server's private key. Generic options =============== `--config=`*filename* : Use *filename* as configuration file. See the **[configuration file](#configuration-file)** section below for the configuration options. `--socket=`*path* : Use *path* as the [`lacme-accountd`(1)] UNIX-domain socket to connect to for signature requests from the [ACME] client. `lacme` aborts if `path` is readable or writable by other users, or if its parent directory is writable by other users. This command-line option overrides the *socket* option of the [`[client]` section](#client-section) of the configuration file. Moreover this option is ignored when the configuration file has an [`[accountd]` section](#accountd-section); in that case `lacme` spawns [`lacme-accountd`(1)], and the two processes communicate through a socket pair. `-h`, `--help` : Display a brief help and exit. `-q`, `--quiet` : Be quiet. `--debug` : Turn on debug mode. Configuration file ================== If `--config=` is not given, `lacme` uses the first existing configuration file among *./lacme.conf*, *$XDG_CONFIG_HOME/lacme/lacme.conf* (or *~/.config/lacme/lacme.conf* if the `XDG_CONFIG_HOME` environment variable is not set), and */etc/lacme/lacme.conf*. Valid options are: Default section --------------- *config-certs* : For certificate issuances (`new-cert` command), specify the space-separated list of certificate configuration files or directories to use (see the **[certificate configuration file](#certificate-configuration-file)** section below for the configuration options). Paths not starting with `/` are relative to the directory name of the **[configuration filename](#configuration-file)**. The list of files and directories is processed in order, with the later items taking precedence. Files in a directory are processed in lexicographic order, only considering the ones with suffix `.conf`. Default: `lacme-certs.conf lacme-certs.conf.d/`. `[client]` section ------------------ This section is used for configuring the [ACME] client (which takes care of [ACME] commands and dialogues with the remote [ACME] server). *socket* : See `--socket=`. Default: *$XDG_RUNTIME_DIR/S.lacme* if the `XDG_RUNTIME_DIR` environment variable is set. *user* : The username to drop privileges to (setting both effective and real uid). Preserve root privileges if the value is empty (not recommended). Default: `nobody`. *group* : The groupname to drop privileges to (setting both effective and real gid, and also setting the list of supplementary gids to that single group). Preserve root privileges if the value is empty (not recommended). Default: `nogroup`. *command* : Path to the [ACME] client executable. Default: `/usr/lib/lacme/client`. *server* : Root URI of the [ACME] server. Default: `https://acme-v01.api.letsencrypt.org/`. *timeout* : Timeout in seconds after which the client stops polling the [ACME] server and considers the request failed. Default: `10`. *SSL_verify* : Whether to verify the server certificate chain. Default: `Yes`. *SSL_version* : Specify the version of the SSL protocol used to transmit data. *SSL_cipher_list* : Specify the cipher list for the connection, see [`ciphers`(1ssl)] for more information. `[webserver]` section --------------------- This section is used for configuring the [ACME] webserver. *listen* : Specify the local address to listen on, in the form `ADDRESS[:PORT]`. If `ADDRESS` is enclosed with brackets ‘[’/‘]’ then it denotes an IPv6; an empty `ADDRESS` means `0.0.0.0`. Default: `:80`. *challenge-directory* : If a webserver is already running, specify a non-existent directory under which the webserver is configured to serve `GET` requests for challenge files under `/.well-known/acme-challenge/` (for each virtual hosts requiring authorization) as static files. Default: `/var/www/acme-challenge`. *user* : The username to drop privileges to (setting both effective and real uid). Preserve root privileges if the value is empty (not recommended). Default: `www-data`. *group* : The groupname to drop privileges to (setting both effective and real gid, and also setting the list of supplementary gids to that single group). Preserve root privileges if the value is empty (not recommended). Default: `www-data`. *command* : Path to the [ACME] webserver executable. Default: `/usr/lib/lacme/webserver`. *iptables* : Whether to automatically install [`iptables`(8)] rules to open the `ADDRESS[:PORT]` specified with *listen*. Theses rules are automatically removed once `lacme` exits. Default: `Yes`. `[accountd]` section --------------------- This section is used for configuring the [`lacme-accountd`(1)] process. If the section (including its header) is absent or commented out, `lacme` connects to an existing UNIX-domain socket bound by a running [`lacme-accountd`(1)] process. *user* : The username to drop privileges to (setting both effective and real uid). Preserve root privileges if the value is empty. *group* : The groupname to drop privileges to (setting both effective and real gid, and also setting the list of supplementary gids to that single group). Preserve root privileges if the value is empty. *command* : Path to the [`lacme-accountd`(1)] executable. Default: `/usr/bin/lacme-accountd`. *config* : Path to the [`lacme-accountd`(1)] configuration file. Default: `/etc/lacme/lacme-accountd.conf`. *privkey* : The (private) account key to use for signing requests. See [`lacme-accountd`(1)] for details. *quiet* : Be quiet. Possible values: `Yes`/`No`. Certificate configuration file ============================== For certificate issuances (`new-cert` command), a separate file is used to configure paths to the certificate and key, as well as the subject, subjectAltName, etc. to generate Certificate Signing Requests. Each section denotes a separate certificate issuance. Valid options are: *certificate* : Where to store the issued certificate (in PEM format). At least one of *certificate* or *certificate-chain* is required. *certificate-chain* : Where to store the issued certificate, concatenated with the content of the file specified specified with the *CAfile* option (in PEM format). At least one of *certificate* or *certificate-chain* is required. *certificate-key* : Path the service's private key. This option is required. The following command can be used to generate a new 4096-bits RSA key in PEM format with mode 0600: openssl genrsa 4096 | install -m0600 /dev/stdin /path/to/srv.key *min-days* : For an existing certificate, the minimum number of days before its expiration date the section is considered for re-issuance. Default: `10`. *CAfile* : Path to the issuer's certificate. This is used for *certificate-chain* and to verify the validity of each issued certificate. Specifying an empty value skip certificate validation. Default: `/usr/share/lacme/lets-encrypt-x3-cross-signed.pem`. *hash* : Message digest algorithm to sign the Certificate Signing Request with. *keyUsage* : Comma-separated list of Key Usages, see [`x509v3_config`(5ssl)]. *subject* : Subject field of the Certificate Signing Request, in the form `/type0=value0/type1=value1/type2=…`. This option is required. *subjectAltName* : Comma-separated list of Subject Alternative Names, in the form `type0:value1,type1:value1,type2:…` The only `type` currently supported is `DNS`, to specify an alternative domain name. *chown* : An optional `username[:groupname]` to chown the issued *certificate* and *certificate-chain* to. *chmod* : An optional octal mode to chmod the issued *certificate* and *certificate-chain* to. *notify* : Command to pass the the system's command shell (`/bin/sh -c`) after successful installation of the *certificate* and/or *certificate-chain*. Examples ======== ~$ sudo lacme new-reg mailto:noreply@example.com ~$ sudo lacme reg=/acme/reg/123456 --agreement-uri=https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf ~$ sudo lacme new-cert ~$ sudo lacme revoke-cert /path/to/server/certificate.pem See also ======== [`lacme-accountd`(1)] [ACME]: https://tools.ietf.org/html/draft-ietf-acme-acme-02 [`lacme-accountd`(1)]: lacme-accountd.1.html [`iptables`(8)]: http://linux.die.net/man/8/iptables [`ciphers`(1ssl)]: https://www.openssl.org/docs/manmaster/apps/ciphers.html [`x509v3_config`(5ssl)]: https://www.openssl.org/docs/manmaster/apps/x509v3_config.html lacme-0.2/webserver000077500000000000000000000077671302130655100144030ustar00rootroot00000000000000#!/usr/bin/perl -T #---------------------------------------------------------------------- # ACME client written with process isolation and minimal privileges in mind # (webserver component) # Copyright © 2015,2016 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; # Usage: webserver FD # # fdopen(3) the file descriptor FD (corresponding to a listening # socket), then keep accept(2)'ing connections and consider each # connection as the verification of an ACME challenge, i.e., serve the # requested challenge token. # # NOTE: one needs to chdir(2) to an appropriate ACME challenge directory # before running this program, since challenge tokens are (on purpose) # only looked for in the current directory. # # NOTE: one should run this program as an unprivileged user:group such # as "www-data:www-data"; bind(2)'ing to a privileged port such as 80 is # not a problem since FD can be bound as root prior to the execve(2). use Errno 'EINTR'; use Socket qw/AF_INET AF_INET6/; # Untaint and fdopen(3) the listening socket # TODO: we could even take multiple file descriptors and select(2) # between them; this could be useful to listen on two sockets, one for # INET and one for INET6 (shift @ARGV // die) =~ /\A(\d+)\z/ or die; open my $S, '+<&=', $1 or die "fdopen $1: $!"; my $ROOT = '/.well-known/acme-challenge'; close STDIN or die "close: $!"; close STDOUT or die "close: $!"; sub info($$$) { my ($sockaddr, $msg, $req) = @_; $req =~ s/\r\n\z// if defined $req; # get a string representation of the peer's address my $fam = Socket::sockaddr_family($sockaddr); my (undef, $ip) = $fam == AF_INET ? Socket::unpack_sockaddr_in($sockaddr) : $fam == AF_INET6 ? Socket::unpack_sockaddr_in6($sockaddr) : die; my $addr = Socket::inet_ntop($fam, $ip); print STDERR $msg." from [$addr]".(defined $req ? ": $req" : "")."\n"; } while (1) { my $sockaddr = accept(my $conn, $S) or do { next if $! == EINTR; # try again if accept(2) was interrupted by a signal die "accept: $!"; }; my $req = $conn->getline(); info($sockaddr, "[$$] Incoming connection", $req) if $ENV{DEBUG}; next unless defined $req; if ($req !~ s/\A(GET|HEAD) (.*) HTTP\/(1\.[01])\r\n\z/$2/) { info($sockaddr, "Error: Bad request", $req); next; } my ($method, $proto) = ($1, $3); # Consume (and ignore) the headers while (defined (my $h = $conn->getline())) { last if $h eq "\r\n" }; my ($status_line, $content_type, $content); if ($req =~ /\A\Q$ROOT\E\/([A-Za-z0-9_\-]+)\z/ and -f $1) { if (open my $fh, '<', $1) { # only open files in the cwd ($status_line, $content_type) = ('200 OK', 'application/jose+json'); $content = do { local $/ = undef; $fh->getline() }; $fh->close() or die "close: $!"; } else { $status_line = '403 Forbidden'; } } $conn->print( "HTTP/$proto ", ($status_line // '404 Not Found'), "\r\n" ); $conn->print( "Content-Type: $content_type\r\n" ) if defined $content_type; $conn->print( "Content-Length: ".length($content)."\r\n" ) if defined $content; $conn->print( "Connection: close\r\n" ); $conn->print( "\r\n" ); $conn->print( $content ) if defined $content and $method eq 'GET'; $conn->close() or die "close: $!"; }