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Protocol-ACME-1.01
River stage zero No dependents
4 ++
/ Protocol::ACME

NAME

Protocol::ACME - Interface to the Let's Encrypt ACME API

VERSION

Version 1.01

SYNOPSIS

 use Protocol::ACME;

 my @names = qw( www.example.com cloud.example.com );

 my $challenges = {
                    'www.example.com'   => Protocol::ACME::Challenge::SimpleSSH->new(
                      { ssh_host => "host1", www_root => "~/www" }
                    ),
                   'cloud.example.com' => Protocol::ACME::Challenge::SimpleSSH->new(
                     { ssh_host => "home2", www_root => "/opt/local/www/htdocs" }
                   )
                 };

 eval
 {
   my $acme = Protocol::ACME->new( host               => $host,
                                   account_key        => $account_key_pem_or_der,
                                 );

   $acme->directory();
   $acme->register();
   $acme->accept_tos();

   for my $domain ( @names )
   {
     $acme->authz( $domain );
     $acme->handle_challenge( $challenges->{$domain} );
     $acme->check_challenge();
     $acme->cleanup_challenge( $challenges->{$domain} );
   }

   my $cert = $acme->sign( $csr_file );
 };
 if ( $@ )
 {
   die if !UNIVERSAL::isa($@, 'Protocol::ACME::Exception');
   die "Error occurred: Status: $@->{status},
                        Detail: $@->{detail},
                        Type:   $@->{type}\n";
 }
 else
 {
   # do something appropriate with the DER encoded cert
   print "Success\n";
 }

DESCRIPTION

The Protocol::ACME is a class implementing an interface for the Let's Encrypt ACME API.

The class handles the protocol details behind provisioning a Let's Encrypt certificate.

CONSTRUCTOR METHODS

The following constructor methods are available:

$acme = Protcol::ACME->new( %options )

This method constructs a new Protocl::ACME object and returns it. Key/value pair arguments may be provided to set up the initial state. The may be passed in as a hash or a hashref. The following options correspond to attribute methods described below. Items marked with a * are required.

   KEY                     DEFAULT
   -----------             --------------------
   *host                   undef
   account_key             undef
   openssl                 undef
   ua                      HTTP::Tiny->new()
   loglevel                error
   debug                   0
   mailto                  undef

host: The API end point to connect to. This will generally be acme-staging.api.letsencrypt.org or acme-v01.api.letsencrypt.org

account_key: The account private key in a scalar ref or filename. See $self-account_key> for details on this arguemtn.

openssl: The path to openssl. If this option is used a local version of the openssl binary will be used for crypto operations rather than Crypt::OpenSSL::RSA.

ua: An HTTP::Tiny object customized as you see fit

loglevel: Set the loglevel to one of the Log::Any values.

debug: If set to non-zero this is a shortcut for loglevel = debug>

mailto: This should be the email address that you want associated with your account. This is used my Let's Encrypt for expiration notification.

METHODS

account_key( $key_filename )
account_key( \$buffer )
account_key( \%explicit_args )

account_key will load a the private account key if it was not already loaded when the pProtocol::ACME object was constructed. There are three ways to call this:

If the arg is a SCALAR it is assumed to be the filename of the key. account_key will throw an error if there are problems reading the file.

If the arg is a SCALAR reference it is assumed to be a buffer that contains the KEY.

If the arg is a HASH reference it contains named arguments. The arguments are:

   KEY          DEFAUL        DESC
   -----------  -----------   -------------------
   filename     undef         The key Filename
   buffer       undef         Buffer containing the key
   format       undef         Explicitly state the format ( DER | PEM )

If both filename and buffer are set the buffer argument will be ignored.

If the format is not explcitly set Protocol::ACME will look at the key and try and determine what the format it.

load_key_from_disk( $key_path )

DEPRECATED

Load a key from disk. Currently the key needs to be unencrypted. Callbacks for handling password protected keys are still to come.

directory()

Loads the directory from the ACME host. This call must be made first before any other calls to the API in order the bootstrap the API resource list.

register( %args )

Call the new-reg resource and create an account associated with the loaded account key. If that key has already been registered this method will gracefully and silently handle that.

Arguments that can be passed in:

   KEY                     DEFAULT
   -----------             --------------------
   mailto                  undef

mailto: See new for a desciption. This will override the value passed to new if any.

accept_tos()

In order to use the Let's Encrypt service, the account needs to accept the Terms of Service. This is provided in a link header in response to the new-reg ( or reg ) resource call. If the TOS have already been accepted as indicated by the reg structure returned by the API this call will be a noop.

authz( $domain )

authz needs to be called for each domain ( called identifiers in ACME speak ) in the certificate. This included the domain in the subject as well as the Subject Alternate Name (SAN) fields. Each call to authz will result in a challenge being issued from Let's Encrypt. These challenges need to be handled individually.

handle_challenge( $challenge_object )

handle_challenge is called for each challenge issued by authz. The challenge object must be a subclass of Protocol::ACME::Challenge which implements a 'handle' method. This objects handle method will be passed three arguments and is expected to fulfill the preconditions for the chosen challenge. The three areguments are:

  fingerprint: the sha256 hex digest of the account key
  token: the challenge token
  url: the url returned by the challenge

Fully describing how to handle every challenge type of out of the scope of this documentation ( at least for now ). Two challenge classes have been included for reference:

Protocol::ACME::Challenge::SimpleSSH is initialized with the ssh host name and the www root for the web server for the http-01 challenge. It will ssh to the host and create the file in the correct location for challenge fulfillment.

Protocol::ACME::Challenge::LocalFile is initialized with just the www root for the web server for the http-01 challenge. It will simply create the challenge file in the correct place on the local filesystem.

Protocol::ACME::Challenge::Manual is intended to be run in an interactive manner and will stop and prompt the user with the relevant information so they can fulfill the challenge manually.

but below is an example for handling the simpleHTTP ( http-01 ) challenge.

check_challenge()

Called after handle_challenge. This will poll the challenge status resource and will return when the state changes from 'pending'.

cleanup_challenge()

Called after check_challenge to remove the challenge files.

$cert = sign( $csr_filename )
$cert = sign( \$buffer )
$cert = sign( \%explicit_args )

Call sign after the challenge for each domain ( itentifier ) has been fulfilled. There are three ways to call this:

If the arg is a SCALAR it is assumed to be the filename of the CSR. sign will throw an error if there are problems reading the file.

If the arg is a SCALAR reference it is assumed to be a buffer that contains the CSR.

If the arg is a HASH reference it contains named arguments. The arguments are:

   KEY          DEFAUL        DESC
   -----------  -----------   -------------------
   filename     undef         The CSR Filename
   buffer       undef         Buffer containing the CSR
   format       undef         Explicitly state the format ( DER | PEM )

If both filename and buffer are set the buffer argument will be ignored.

If the format is not explcitly set Protocol::ACME will look at the CSR and try and determine what the format it.

On success Protocol::ACME will return the DER encoded signed certificate.

$cert_chain = chain()

After sign has been called and a cert successfully created, chain will fetch and return the DER encoded certificate issuer.

revoke( $certfile )

Call revoke to revoke an already issued certificate. $certfile must point the a DER encoded form of the certificate.

recovery_key()

LE does not yet support recovery keys. This method will die when called.

AUTHOR

Stephen Ludin, <sludin at ludin.org>

BUGS

Please report any bugs or feature requests to bug-protocol-acme at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Protocol-ACME. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

REPOSITORY

https://github.com/sludin/Protocol-ACME

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Protocol::ACME

You can also look for information at:

CONTRIBUTORS

Felipe Gasper, <felipe at felipegasper.com>

ACKNOWLEDGEMENTS

LICENSE AND COPYRIGHT

Copyright 2015 Stephen Ludin.

This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:

http://www.perlfoundation.org/artistic_license_2_0

Any use, modification, and distribution of the Standard or Modified Version 1.01 distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license.

If your Modified Version has been derived from a Modified Version made by someone other than you, you are nevertheless required to ensure that your Modified Version complies with the requirements of this license.

This license does not grant you the right to use any trademark, service mark, tradename, or logo of the Copyright Holder.

This license includes the non-exclusive, worldwide, free-of-charge patent license to make, have made, use, offer to sell, sell, import and otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by the Package. If you institute patent litigation (including a cross-claim or counterclaim) against any party alleging that the Package constitutes direct or contributory patent infringement, then this Artistic License to you shall terminate on the date that such litigation is filed.

Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.