=head1 NAME

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

=head1 VERSION

Version 1.01

=head1 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"; }

=head1 DESCRIPTION

The CProtocol::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.

=head1 CONSTRUCTOR METHODS

The following constructor methods are available:

=over 4

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

This method constructs a new CProtocl::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

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

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

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

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

B: Set the loglevel to one of the CLog::Any values.

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

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

=back

=head2 METHODS

=over

=item account_key( $key_filename )

=item account_key( $buffer )

=item account_key( %explicit_args )

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

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

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

If the arg is a B<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 C and C are set the C argument will be ignored.

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

=item load_key_from_disk( $key_path )

B<DEPRECATED>

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

=item 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.

=item 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

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

=item 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.

=item authz( $domain )

C 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 C will result in a challenge being issued from Let's Encrypt. These challenges need to be handled individually.

=item handle_challenge( $challenge_object )

C<handle_challenge> is called for each challenge issued by C. The challenge object must be a subclass of CProtocol::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:

CProtocol::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.

CProtocol::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.

CProtocol::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.

=item check_challenge()

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

=item cleanup_challenge()

Called after C<check_challenge> to remove the challenge files.

=item $cert = sign( $csr_filename )

=item $cert = sign( $buffer )

=item $cert = sign( %explicit_args )

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

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

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

If the arg is a B<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 C and C are set the C 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 CProtocol::ACME will return the DER encoded signed certificate.

=item $cert_chain = chain()

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

=item revoke( $certfile )

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

=item recovery_key()

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

=back

=head1 AUTHOR

Stephen Ludin, C<< >>

=head1 BUGS

Please report any bugs or feature requests to C, or through the web interface at Lhttp://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.

=head1 REPOSITORY

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

=head1 SUPPORT

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

perldoc Protocol::ACME

You can also look for information at:

=over 4

=item * RT: CPAN's request tracker (report bugs here)

Lhttp://rt.cpan.org/NoAuth/Bugs.html?Dist=Protocol-ACME

=item * AnnoCPAN: Annotated CPAN documentation

Lhttp://annocpan.org/dist/Protocol-ACME

=item * CPAN Ratings

Lhttp://cpanratings.perl.org/d/Protocol-ACME

=item * Search CPAN

Lhttp://search.cpan.org/dist/Protocol-ACME/

=back

=head1 CONTRIBUTORS

Felipe Gasper, C<< >>

=head1 ACKNOWLEDGEMENTS

=head1 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:

Lhttp://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.

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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.

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