This is a generic module for authentication against an OAuth2 or OIDC server. It performs the authorization_code flow
and then uses the resulting access token to query an endpoint to get the user's attributes. It is a wrapper around the
excellent PHP League OAuth2 Client.
If you are interested in using SSP as an OIDC OP see the OIDC module.
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The module can be installed with composer.
composer require cirrusidentity/simplesamlphp-module-authoauth2
Or you can install the latest from master
composer require cirrusidentity/simplesamlphp-module-authoauth2:dev-master
If you install into a tar ball distribution of SSP then composer, by default, will also install all dev dependencies for SSP and this module. This can be a long list.
If you prefer not having dev dependencies installed, then you can use.
composer require --no-update cirrusidentity/simplesamlphp-module-authoauth2 && composer update --no-dev cirrusidentity/simplesamlphp-module-authoauth2
The generic OAuth2 client is configured with
- the OAuth2 server endpoints
- the client secret/id
- optional parameters for scope
- optional query parameters for the authorization url
Almost all OAuth2/OIDC providers will require you to register a redirect URI. Use a url of the form below, and set hostname, SSP_PATH and optionally port to the correct values.
https://hostname/SSP_PATH/module.php/authoauth2/linkback.php
The majority of configuration items are passed through to the provider implementation so it will depend on
the provider you choose. If you use the authsource authoauth2:OAuth2 without overriding the providerClass then
the options from "Generic Usage" will work. If you use authoauth2:OpenIDConnect then a different set of
configuration options are available.
scope vs scopes: The default provider used by authoauth2:OAuth2 supports setting 'scopes' => ['email'] or by setting
scope in urlAuthorizeOptions. Other providers may only support the latter (setting in urlAuthorizeOptions).
Generic usage provides enough configuration parameters to use with any OAuth2 or OIDC server.
'oauth2' => array(
'authoauth2:OAuth2',
// *** Required for all integrations ***
'urlAuthorize' => 'https://www.example.com/oauth2/authorize',
'urlAccessToken' => 'https://www.example.com/oauth2/token',
'urlResourceOwnerDetails' => 'https://api.example.com/userinfo',
// You can add query params directly to urlResourceOwnerDetails or use urlResourceOwnerOptions.
'urlResourceOwnerOptions' => [
'fields' => 'id,name,first_name,last_name,email'
],
// allow fields from token response to be query params on resource owner details request
'tokenFieldsToUserDetailsUrl' => [
'fieldName' => 'queryParamName',
'access_token' => 'access_token',
'user_id' > 'user_id',
],
// *** Required for most integrations ***
// Test App.
'clientId' => '133972730583345',
'clientSecret' => '36aefb235314bad5df075363b79cbbcd',
// *** Optional ***
// Custom query parameters to add to authorize request
'urlAuthorizeOptions' => [
'prompt' => 'always',
// The underlying OAuth2 library also supports overriding requested scopes
//'scope' => ['other']
],
// Default scopes to request
'scopes' = ['email', 'profile'],
'scopeSeparator' => ' ',
// Customize redirect, if you don't want to use the standard /module.php/authoauth2/linkback.php
'redirectUri' => 'https://myapp.example.com/callback',
// See League\OAuth2\Client\Provider\GenericProvider for more options
// Guzzle HTTP config
// Wait up to 3.4 seconds for Oauth2 servers to respond
//http://docs.guzzlephp.org/en/stable/request-options.html#timeout
'timeout' => 3.4,
// http://docs.guzzlephp.org/en/stable/request-options.html#proxy
'proxy' => [
],
// All attribute keys will have this prefix
'attributePrefix' => 'someprefix.',
// Enable logging of request/response. This *will* leak you client secret and tokens into the logs
'logHttpTraffic' => true, //default is false
'logMessageFormat' => 'A Guzzle MessageFormatter format string', // default setting is sufficient for most debugging
'logIdTokenJson' => true, //default false. Log the json in the ID token.
),For providers that support OpenID Connect discovery protocol the configuration can be simplified a bit. Only the issuer url, client id and client secret are required..
Not all configuration options from authoauth2:OAuth2 are supported in OpenIDConnect
'openidconnect' => array(
'authoauth2:OpenIDConnect',
// *** Required for all integrations ***
'issuer' => 'https://www.example.com', # e.g https://accounts.google.com
'clientId' => '133972730583345',
'clientSecret' => '36aefb235314bad5df075363b79cbbcd',
// Most Optional settings for OAuth2 above can be used
// *** New Optional ***
// Customize post logout redirect, if you don't want to use the standard /module.php/authoauth2/loggedout.php
'postLogoutRedirectUri' => 'https://myapp.example.com/loggedout'
// Earlier version OpenIDConnect authsource doesn't support using `scopes` for overriding scope
//'urlAuthorizeOptions' => [
// 'scope' => 'openid'
//]
),If your OP supports front channel single logout, you can configure https://hostname/SSP_PATH/module.php/authoauth2/logout.php?authSource=AUTHSOURCE where AUTHSOURCE is the id of your authsource in the authsources configuration (openidconnect in the example above)
There are numerous Offical and Third-Party providers that you can use instead of the generic OAuth2 provider. Using one of those providers can simplify the configurations.
To use a provider you must first install it composer require league/oauth2-some-provider
and then configure it.
'providerExample' => array(
// Must install correct provider with: composer require league/oauth2-example
'authoauth2:OAuth2',
'providerClass' => 'League\OAuth2\Client\Provider\SomeProvider',
'clientId' => 'my_id',
'clientSecret' => 'my_secret',
),For some OAuth2 providers the generic endpoint configurations are already defined in ConfigTemplate. You can reference
this to reduce the amount of typing needed in your authsource
'google' => array_merge(\SimpleSAML\Module\authoauth2\ConfigTemplate::GoogleOIDC, [
'clientId' => '3473456456-qqh0n4b5rrt7vkapgk3e4osre40.apps.googleusercontent.com',
'clientSecret' => 'shhh',
'urlAuthorizeOptions' => [
'hd' => 'example.com',
],
]),or by using the template option
'providerExample' => array(
'authoauth2:OAuth2',
'template' => 'GoogleOIDC',
'clientId' => 'my_id',
'clientSecret' => 'my_secret',
),Several of these samples show how to configure the generic endpoint to authenticate against Facebook, Amazon and Google, etc.
In a lot of cases you can use a template from ConfigTemplate to make the configuration cleaner or you can use a provider specific implementations of the base OAuth2 client.
You can use the Facebook template 'template' => 'Facebook', and then provide just the clientId and clientSecret to
have a cleaner looking config
'genericFacebookTest' => array(
'authoauth2:OAuth2',
// *** Facebook endpoints ***
'urlAuthorize' => 'https://www.facebook.com/dialog/oauth',
'urlAccessToken' => 'https://graph.facebook.com/oauth/access_token',
// Add requested attributes as fields
'urlResourceOwnerDetails' => 'https://graph.facebook.com/me?fields=id,name,first_name,last_name,email',
// *** My application ***
'clientId' => '13397273example',
'clientSecret' => '36aefb235314baexample',
'scopes' => 'email',
// *** Optional ***
// Custom query parameters to add to authorize request
'urlAuthorizeOptions' => [
// Force use to reauthenticate
'auth_type' => 'reauthenticate',
],
), 'genericAmazonTest' => array(
'authoauth2:OAuth2',
// *** Amazon Endpoints ***
'urlAuthorize' => 'https://www.amazon.com/ap/oa',
'urlAccessToken' => 'https://api.amazon.com/auth/o2/token',
'urlResourceOwnerDetails' => 'https://api.amazon.com/user/profile',
// *** My application ***
'clientId' => 'amzn1.application-oa2-client.94d04152358dexample',
'clientSecret' => '8681bdd290df87example',
'scopes' => 'profile',
),View full Google instructions.
'genericGoogleTest' => array(
'authoauth2:OAuth2',
// *** Google Endpoints ***
'urlAuthorize' => 'https://accounts.google.com/o/oauth2/auth',
'urlAccessToken' => 'https://accounts.google.com/o/oauth2/token',
'urlResourceOwnerDetails' => 'https://www.googleapis.com/oauth2/v3/userinfo',
// *** My application ***
'clientId' => '685947170891-exmaple.apps.googleusercontent.com',
'clientSecret' => 'wV0FdFs_example',
'scopes' => array(
'openid',
'email',
'profile'
),
'scopeSeparator' => ' ',
),View full Google instructions.
'googleProvider' => array(
// Must install correct provider with: composer require league/oauth2-google
'authoauth2:OAuth2',
'providerClass' => 'League\OAuth2\Client\Provider\Google',
'clientId' => 'client_id',
'clientSecret' => 'secret',
),You can enable http logging with the logHttpTraffic flag and optionally customize the
format with logMessageFormat. See Guzzle's MessageFormatter class for how to define a
format string.
security note: enabling http logging will make your client secret and any returned access or id tokens to appear in your logs.
You can use curl on the command line to interact with the OAuth2/OIDC server.
Get Code
The first step is get a valid code AND ensure the module doesn't try to use it. This can be done by constructing an authorize url with an invalid state value but with all other params correct
If you log in with the above it will redirect you back to your SSP instance with an authorization_code (which you should capture)
and then your SSP instance will report an error about an invalid state parameter. The state check happens prior to consuming the authorization_code so you know SSP hasn't used it.
Get Access Token
Now you can use the code and try to get an access token
curl -d "code=REPLACE" \
-d "client_secret=my_secret" \
-d "client_id=my_client" \
-d "redirect_uri=https://myapp.example.com/simplesaml/module.php/authoauth2/linkback.php" \
-d 'grant_type=authorization_code' \
https://as.example.com/openid/tokenGet User Info
Take the access token from above and call the user info endpoint
curl -H "Authorization: Bearer $ACCESS_TOKEN" https://as.example.com/userInfo
If you are migrating away from an existing auth module, such as authfacebook you will need to one of the following:
- add this module's
authoauth2redirect URI to the facebook app, or - override the
authoauth2authsource's redirect URI to match theauthfacebookuri (https://myserver.com/module.php/authfacebook/linkback.php)AND do one of the following- edit
/modules/authfacebook/www/linkback.phpto conditionally callOAuth2ResponseHandler(see below) - configure an Apache rewrite rule to change '/module.php/authfacebook/linkback.php' to '/module.php/authoauth2/linkback.php'
- symlink or edit
/modules/authfacebook/www/linkback.phpto invoke the/modules/authoauth2/www/linkback.php
- edit
Some social providers support multiple login protocols and older SSP modules may use the non-OAuth2 version for login. To migrate to this module you may need to make some application changes. For example
- the LinkedIn module uses oauth1 and you may need to make adjustments to your app to move to their oauth2 API
- moving from OpenID 2 Yahoo logins to OIDC Yahoo logins requires creating a Yahoo app.
To migrate from an existing module you can adjust that modules linkback/redirect handler to conditionally use the OAuth2ResponseHandler
In the below example the code will use the authoauth2 if that is what initiated the process else use the existing handler
$handler = new \SimpleSAML\Module\authoauth2\OAuth2ResponseHandler();
if ($handler->canHandleResponse()) {
$handler->handleResponse();
return;
} To perform some integration tests you can run the embedded
webserver. You may need to run composer install and then phpunit one time first to correctly
link the project into SSP's modules directory
export SIMPLESAMLPHP_CONFIG_DIR=$PWD/tests/config/
mkdir -p /tmp/ssp-log/
php -S 0.0.0.0:8732 -t $PWD/vendor/simplesamlphp/simplesamlphp/www &
Then visit http://abc.tutorial.stack-dev.cirrusidentity.com:8732/
Note: *.tutorial.stack-dev.cirrusidentity.com resolves to your local host.
authsources.php contains some preconfigured clients. The generic facebook and google ones should work as is.
The generic amazon one requires https. You can run use it and when Amazon redirects back to https change the url to
http to proceed. The google provider authsource requires you to install the google auth module first.
Run phpcs to check code style
php vendor/bin/phpcs