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Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
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Yesod LDAP authentication plugin using native Haskell Ldap.Client

  • does not depend on system libraries
  • service account bind
  • customizable
  • optional group membership verification

There is more than one way to perform LDAP based authentication. The key thing to decide is how to map from usernames to DNs.

This module follows the service bind approach where we bind with preconfigured credentials and run queries to find user DN and optionally verify group membership. After that we bind as user to verify password.

Another common, although in some ways more limited, approach is defining DNs as templates eg. uid=%s,ou=people,dc=example,dc=com. This module does not support template based configuration. Please submit an issue or create a pull request if you'd like that.


Basic configuration in Foundation.hs:

ldapConf :: LdapAuthConf
ldapConf =
    setHost (Secure "") $ setPort 636
  $ mkLdapConf (Just ("cn=Manager,dc=example,dc=com", "v3ryS33kret"))

And add authLdap ldapConf to your authPlugins.

Make sure the address you provide exactly maches the one in the server certificate. Otherwise you will only get a cryptic TLS negotiation failure.

For plain connection (only for testing!):

setHost (Plain "")

For additional group authentication use setGroupQuery:

 ldapConf :: LdapAuthConf
 ldapConf =
     setGroupQuery (Just $ mkGroupQuery
       "ou=group,dc=example,dc=com" "cn" "it" "memberUid")
   $ setHost (Secure "") $ setPort 636
   $ mkLdapConf (Just ("cn=yourapp,ou=services,dc=example,dc=com", "v3ryS33kret"))

In the example above user jdoe will only be successfully authenticated if:

  • service bind using the provided account is successful
  • and exactly one entry with objectclass=posixAccount and uid=jdoe exists somewhere in ou=people,dc=example,dc=com
  • and at least one group exists with cn=it and memberUid=jdoe in ou=group,dc=example,dc=com
  • and user bind is successful

Fine control of the queries is available with setUserQuery and setGroupQuery.

When testing or during initial configuration consider using setDebug - set to 1 to enable. This will give you exact error condition instead of "That is all we know". Never use it in production though as it may reveal sensitive information.

API Documentation

Documentation is available on hackage.

Refer to ldap-client documentation for details.