SAML

Authentication Users Password

Presentation

LL::NG can use SAML2 to get user identity and grab some attributes defined in user profile on its Identity Provider (IDP). In this case, LL::NG acts like an SAML2 Service Provider (SP).

Several IDPs are allowed, in this case the user will choose the IDP he wants. You can preselect IDP with an IDP resolution rule.

For each IDP, you can configure attributes that are collected. Some can be mandatory, so if they are not returned by IDP, the session will not open.

LL::NG can also act as SAML IDP, that allows one to interconnect two LL::NG systems.

Configuration

SAML Service

See SAML service configuration chapter.

Browser implementations of formAction directive are inconsistent (e.g. Firefox doesn't block the redirects whereas Chrome does). Administrators may have to modify formAction value with wildcard likes *.

In Manager, go in :

General Parameters > Advanced Parameters > Security > Content Security Policy > Form destination

Authentication and UserDB

In General Parameters > Authentication modules, set:

  • Authentication module: SAML
  • Users module: SAML
As passwords will not be managed by LL::NG, you can disable menu password module.

Register LemonLDAP::NG on partner Identity Provider

After configuring SAML Service, you can export metadata to your partner Identity Provider.

They are available at the EntityID URL, by default: http://auth.example.com/saml/metadata.

Register partner Identity Provider on LemonLDAP::NG

In the Manager, select node SAML identity providers and click on Add SAML IDP. The IDP name is asked, enter it and click OK.

Metadata

You must register IDP metadata here. You can do it either by uploading the file, or get it from IDP metadata URL (this require a network link between your server and the IDP):

You can also edit the metadata directly in the textarea

Exported attributes

For each attribute, you can set:

  • Key name: name of the key in LemonLDAP::NG session (for example “uid” will then be used as $uid in access rules)
  • Mandatory: if set to On, then session will not open if this attribute is not given by IDP.
  • Name: SAML attribute name.
  • Friendly Name: optional, SAML attribute friendly name.
  • Format (optional): SAML attribute format.

Options

General options
  • Resolution Rule: rule that will be applied to preselect an IDP for a user. You have access to all environment variable (like user IP address) and all session keys.

For example, to preselect this IDP for users coming from 129.168.0.0/16 network and member of “admin” group:

$ENV{REMOTE_ADDR} =~ /^192\.168/ and $groups =~ /\badmin\b/
Authentication request
  • NameID format: force NameID format here (email, persistent, transient, etc.). If no value, will use first NameID Format activated in metadata.
  • Force authentication: set ForceAuthn flag in authentication request
  • Passive authentication: set IsPassive flag in authentication request
  • Allow proxied authentication: allow an authentication response to be issued from another IDP that the one we register (proxy IDP). If you disallow this, you should also disallow direct login form IDP, because proxy restriction is set in authentication requests.
  • Allow login from IDP: allow a user to connect directly from an IDP link. In this case, authentication is not a response to an issued authentication request, and we have less control on conditions.
  • Requested authentication context: this context is declared in authentication request. When receiving the request, the real authentication context will be mapped to an internal authentication level (see how configure the mapping), that you can check to allow or deny session creation.
  • Allow URL as RelayState: Set to On if the RelayState value sent by IDP is the URL where the user must be redirected after authentication.
Session
  • Adapt session lifetime: session lifetime will be adapted from SessionNotOnOrAfter value found in authentication response. It means that if the IDP propose to close session earlier than the default LemonLDAP::NG timeout, the session _utime will be modified so that session is erased at the date indicated by the IDP.
  • Force UTF-8: this will force UTF-8 conversion of attributes values collected from IDP.
  • Store SAML Token: allows one to keep SAML token (assertion) inside user session. Don't enable it unless you need to replay this token on an application.
  • Attribute containing user identifier: set the value of SAML attribute (“Name”) that should be used as user main identifier ($user). If empty, the NameID content is used.
Signature

These options override service signature options (see SAML service configuration).

  • Sign SSO message: sign SSO message
  • Check SSO message signature: check SSO message signature
  • Sign SLO message: sign SLO message
  • Check SLO message signature: check SLO message signature
Binding
  • SSO binding: force binding to use for SSO (http-redirect, http-post, etc.)
  • SLO binding: force binding to use for SLO (http-redirect, http-post, etc.)
If no binding defined, the default binding in IDP metadata will be used.
Security
  • Encryption mode: set the encryption mode for this IDP (None, NameID or Assertion).
  • Check time conditions: set to Off to disable time conditions checking on authentication responses.
  • Check audience conditions: set to Off to disable audience conditions checking on authentication responses.