[[LDAP_Based_Authentication_Migration]]
= LDAP Authentication Migration

The section describing how to migrate from properties based
authentication using either PicketBox or legacy security realms to
Elytron also contained a lot of additional information regarding
defining security domains, authentication factories, and how these are
mapped to be used for authentication. This section will illustrate some
equivalent LDAP configuration using legacy security realms and PicketBox
security domains and show the equivalent configuration using Elytron but
will not repeat the steps to wire it all together covered in the
previous section.

These configuration examples are developed against a test LDAP sever
with user entries like: -

....
dn: uid=TestUserOne,ou=users,dc=group-to-principal,dc=wildfly,dc=org
objectClass: top
objectClass: inetOrgPerson
objectClass: uidObject
objectClass: person
objectClass: organizationalPerson
cn: Test User One
sn: Test User One
uid: TestUserOne
userPassword: {SSHA}UG8ov2rnrnBKakcARVvraZHqTa7mFWJZlWt2HA==
....

The group entries then look like: -

....
dn: uid=GroupOne,ou=groups,dc=group-to-principal,dc=wildfly,dc=org
objectClass: top
objectClass: groupOfUniqueNames
objectClass: uidObject
cn: Group One
uid: GroupOne
uniqueMember: uid=TestUserOne,ou=users,dc=group-to-principal,dc=wildfly,dc=org
....

For authentication purposes the username will be matched against the
'uid' attribute, also the resulting group name will be taken from the
'uid' attribute of the group entry.

[[legacy-security-realm-ldap]]
== Legacy Security Realm

A connection to the LDAP server and related security realm can be
created with the following commands: -

[source,options="nowrap"]
----
batch
./core-service=management/ldap-connection=MyLdapConnection:add(url="ldap://localhost:10389", search-dn="uid=admin,ou=system", search-credential="secret")
 
./core-service=management/security-realm=LDAPRealm:add
./core-service=management/security-realm=LDAPRealm/authentication=ldap:add(connection="MyLdapConnection", username-attribute=uid, base-dn="ou=users,dc=group-to-principal,dc=wildfly,dc=org")
 
 
./core-service=management/security-realm=LDAPRealm/authorization=ldap:add(connection=MyLdapConnection)
./core-service=management/security-realm=LDAPRealm/authorization=ldap/username-to-dn=username-filter:add(attribute=uid, base-dn="ou=users,dc=group-to-principal,dc=wildfly,dc=org")
./core-service=management/security-realm=LDAPRealm/authorization=ldap/group-search=group-to-principal:add(base-dn="ou=groups,dc=group-to-principal,dc=wildfly,dc=org", iterative=true, prefer-original-connection=true, principal-attribute=uniqueMember, search-by=DISTINGUISHED_NAME, group-name=SIMPLE, group-name-attribute=uid)
run-batch
----

This results in the following configuration.

[source,xml,options="nowrap"]
----
  <management>
    <security-realms>
      ...
      <security-realm name="LDAPRealm">
        <authentication>
          <ldap connection="MyLdapConnection" base-dn="ou=users,dc=group-to-principal,dc=wildfly,dc=org">
            <username-filter attribute="uid"/>
          </ldap>
        </authentication>
        <authorization>
          <ldap connection="MyLdapConnection">
            <username-to-dn>
              <username-filter base-dn="ou=users,dc=group-to-principal,dc=wildfly,dc=org" attribute="uid"/>
            </username-to-dn>
            <group-search group-name="SIMPLE" iterative="true" group-name-attribute="uid">
              <group-to-principal search-by="DISTINGUISHED_NAME" base-dn="ou=groups,dc=group-to-principal,dc=wildfly,dc=org" prefer-original-connection="true">
                <membership-filter principal-attribute="uniqueMember"/>
              </group-to-principal>
            </group-search>
          </ldap>
        </authorization>
      </security-realm>
    </security-realms>
    <outbound-connections>
      <ldap name="MyLdapConnection" url="ldap://localhost:10389" search-dn="uid=admin,ou=system" search-credential="secret"/>
    </outbound-connections>
    ...
  </management>
----

[[picketbox-ldapextloginmodule]]
== PicketBox LdapExtLoginModule

The following commands can create a PicketBox security domain configured
to use the LdapExtLoginModule to verify a username and password.

[source,options="nowrap"]
----
./subsystem=security/security-domain=application-security:add
./subsystem=security/security-domain=application-security/authentication=classic:add(login-modules=[{code=LdapExtended, flag=Required, module-options={ \
java.naming.factory.initial=com.sun.jndi.ldap.LdapCtxFactory, \
java.naming.provider.url=ldap://localhost:10389, \
java.naming.security.authentication=simple, \
bindDN="uid=admin,ou=system", \
bindCredential=secret, \
baseCtxDN="ou=users,dc=group-to-principal,dc=wildfly,dc=org", \
baseFilter="(uid={0})", \
rolesCtxDN="ou=groups,dc=group-to-principal,dc=wildfly,dc=org",\
roleFilter="(uniqueMember={1})", \
roleAttributeID="uid" \
}}])
----

This results in the following configuration.

[source,xml,options="nowrap"]
----
  <subsystem xmlns="urn:jboss:domain:security:2.0">
    ...
    <security-domains>
      ...
      <security-domain name="application-security">
        <authentication>
          <login-module code="LdapExtended" flag="required">
            <module-option name="java.naming.factory.initial" value="com.sun.jndi.ldap.LdapCtxFactory"/>
            <module-option name="java.naming.provider.url" value="ldap://localhost:10389"/>
            <module-option name="java.naming.security.authentication" value="simple"/>
            <module-option name="bindDN" value="uid=admin,ou=system"/>
            <module-option name="bindCredential" value="secret"/>
            <module-option name="baseCtxDN" value="ou=users,dc=group-to-principal,dc=wildfly,dc=org"/>
            <module-option name="baseFilter" value="(uid={0})"/>
            <module-option name="rolesCtxDN" value="ou=groups,dc=group-to-principal,dc=wildfly,dc=org"/>
            <module-option name="roleFilter" value="(uniqueMember={1})"/>
            <module-option name="roleAttributeID" value="uid"/>
          </login-module>
        </authentication>
      </security-domain>
    </security-domains>
  </subsystem>
----

[[migrated]]
== Migrated

Within the Elytron subsystem a directory context can be defined for the
connection to LDAP: -

[source,options="nowrap"]
----
./subsystem=elytron/dir-context=ldap-connection:add(url=ldap://localhost:10389, principal="uid=admin,ou=system", credential-reference={clear-text=secret})
----

Then a security realm can be created to search LDAP and verify the
supplied password: -

[source,options="nowrap"]
----
./subsystem=elytron/ldap-realm=ldap-realm:add(dir-context=ldap-connection, \
direct-verification=true, \
identity-mapping={search-base-dn="ou=users,dc=group-to-principal,dc=wildfly,dc=org", \
rdn-identifier="uid", \
attribute-mapping=[{filter-base-dn="ou=groups,dc=group-to-principal,dc=wildfly,dc=org",filter="(uniqueMember={1})",from="uid",to="Roles"}]})
----

In the prior two examples information is loaded from LDAP to use
directly as groups or roles, in the Elytron case information can be
loaded from LDAP to associate with the identity as attributes - these
can subsequently be mapped to roles but attributes can be loaded for
other purposes as well.

[IMPORTANT]

By default, if no `role-decoder` is defined for given `security-domain`,
identity attribute " `Roles`" is mapped to the identity roles.

This leads to the following configuration.

[source,xml,options="nowrap"]
----
  <subsystem xmlns="urn:wildfly:elytron:1.0" final-providers="combined-providers" disallowed-providers="OracleUcrypto">
    ...
    <security-realms>
      ...
      <ldap-realm name="ldap-realm" dir-context="ldap-connection" direct-verification="true">
        <identity-mapping rdn-identifier="uid" search-base-dn="ou=users,dc=group-to-principal,dc=wildfly,dc=org">
          <attribute-mapping>
            <attribute from="uid" to="Roles" filter="(uniqueMember={1})" filter-base-dn="ou=groups,dc=group-to-principal,dc=wildfly,dc=org"/>
          </attribute-mapping>
        </identity-mapping>
      </ldap-realm>
    </security-realms>
    ...
    <dir-contexts>
      <dir-context name="ldap-connection" url="ldap://localhost:10389" principal="uid=admin,ou=system">
        <credential-reference clear-text="secret"/>
      </dir-context>
    </dir-contexts>
  </subsystem>
----
