Abstraction of various SASL mechanism responses.

v1.0.3 2021-02-15 11:51 UTC

This package is auto-updated.

Last update: 2021-10-17 15:48:20 UTC


The PHP SASL Authentification Library.

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Provides code to generate responses to common SASL mechanisms, including:

  • Digest-MD5
  • Cram-MD5
  • Plain
  • Anonymous
  • Login (Pseudo mechanism)

Full refactored version of the the original Auth_SASL2 Pear package.


The easiest way to install fabiang/sasl is by using Composer:

curl -sS https://getcomposer.org/installer | php
php composer.phar require fabiang/sasl


Use the factory method to create a authentication mechanism object:

use Fabiang\Sasl\Sasl;

$factory = new Sasl;

$mechanism = $factory->factory('SCRAM-SHA-1', array(
    'authcid'  => 'username',
    'secret'   => 'password',
    'authzid'  => 'authzid', // optional. Username to proxy as
    'service'  => 'servicename', // optional. Name of the service
    'hostname' => 'hostname', // optional. Hostname of the service

$response = $mechanism->createResponse();

Challenge-based authentication mechanisms implement the interface Fabiang\Sasl\Authentication\ChallengeAuthenticationInterface. For those mechanisms call the method again with the challenge:

$response = $mechanism->createResponse($challenge);

Note: The challenge must be Base64 decoded.

SCRAM verification

To verify the data returned by the server for SCRAM you can call:


If the method returns false you should disconnect.

Required options

List of options required by authentication mechanisms. For mechanisms that are challenge-based you'll need to call createResponse() again and send the returned value to the server.

Mechanism Authcid Secret Authzid Service Hostname Challenge
Anonymous yes no no no no no
CramMD5 yes yes no no no yes
DigestMD5 yes yes optional yes yes yes
External no no yes no no no
Login yes yes no no no no
Plain yes yes optional no no no
SCRAM-* yes yes optional no no yes


If you like this library and you want to contribute, make sure the unit tests and integration tests are running. Composer will help you to install the right version of PHPUnit and Behat.

composer install --dev

After that run the unit tests:

./vendor/bin/phpunit -c tests

The integration tests verify the authentication methods against an Ejabberd and Dovecot server. To launch the servers you can use the provided Vagrant box. Just install Vagrant and run:

vagrant up

After some minutes you'll have the runnig server instances inside of a virtual machine. Now you can run the integration tests:

./vendor/bin/behat -c tests/behat.yml.dist


BSD-3-Clause. See the LICENSE.md.