Protocol::ACME - Interface to the Let's Encrypt ACME API
Version 1.01
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";
}
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.
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.
- 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 thepProtocol::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
andbuffer
are set thebuffer
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 toauthz
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 byauthz
. The challenge object must be a subclass ofProtocol::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
andbuffer
are set thebuffer
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.
Stephen Ludin, <sludin at ludin.org>
Please report any bugs or feature requests to bug-protocol-acme at rt.cpan.org
, or through the web interface at https://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.
https://github.com/sludin/Protocol-ACME
You can find documentation for this module with the perldoc command.
perldoc Protocol::ACME
You can also look for information at:
RT: CPAN's request tracker (report bugs here)
AnnoCPAN: Annotated CPAN documentation
CPAN Ratings
Search CPAN
Felipe Gasper, <felipe at felipegasper.com>
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:
https://www.perlfoundation.org/artistic_license_2_0
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