138 lines
6.7 KiB
XML
138 lines
6.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0"
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xml:id="configuring-keystone-for-ldap-backend">
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<title>Integrate Identity with LDAP</title>
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<para>The Openstack Identity Service supports integration with
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existing LDAP directories for authentication and authorization
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services.</para>
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<para>When the Openstack Identity service is configured to use LDAP
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back ends, you can split authentication (using the
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<emphasis>identity</emphasis> feature) and
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authorization (using the
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<emphasis>assignment</emphasis> feature).</para>
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<para>The identity feature enables administrators to manage
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users and groups by each domain or the Openstack Identity Service entirely.</para>
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<para>The Assignments feature enables administrators to manage
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project role authorization using the Openstack Identity service SQL
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database, while providing user authentication through the
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LDAP directory.</para>
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<important os="rhel;fedora;centos">
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<para>For OpenStack Identity service to access LDAP servers, you must
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enable the <option>authlogin_nsswitch_use_ldap</option> boolean
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value for SELinux on the Openstack Identity server. To enable and
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make the option persistent across reboots:</para>
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<screen><prompt>#</prompt> <userinput>setsebool -P authlogin_nsswitch_use_ldap on</userinput></screen>
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</important>
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<para>Identity configuration is split into two separate back ends: identity
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(back end for users and groups) and assignments (back end for domains,
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projects, roles, role assignments). To configure identity, set options in the
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<filename>/etc/keystone/keystone.conf</filename> file.
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See <xref linkend="configuring-keystone-for-ldap-backend-identity"/>
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for identity back end configuration examples and
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<xref linkend="configuring-keystone-for-ldap-backend-assignments"/>
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for assignment back end configuration examples.
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Modify these examples as needed.</para>
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<note>
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<para>Multiple back ends are supported. You can integrate the Openstack Identity service
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with a single LDAP server (configure both identity and assignments to
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LDAP, or set identity and assignments back end with SQL or LDAP),
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or multiple back ends using domain-specific configuration files.</para>
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</note>
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<formalpara>
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<title>To define the destination LDAP server</title>
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<para>Define the destination LDAP server in the
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<filename>keystone.conf</filename> file:</para>
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</formalpara>
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<programlisting language="ini">[ldap]
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url = ldap://localhost
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user = dc=Manager,dc=example,dc=org
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password = samplepassword
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suffix = dc=example,dc=org
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use_dumb_member = False
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allow_subtree_delete = False</programlisting>
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<note>
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<para>Configure <option>dumb_member</option> if you set <option>use_dumb_member</option> to true.</para>
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<programlisting language="ini">[ldap]
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dumb_member = cn=dumb,dc=nonexistent</programlisting>
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</note>
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<formalpara>
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<title>Additional LDAP integration settings</title>
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<para>Set these options in the
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<filename>/etc/keystone/keystone.conf</filename> file for a single LDAP server, or
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<filename>/etc/keystone/domains/keystone.<replaceable>DOMAIN_NAME</replaceable>.conf</filename> files for
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multiple back ends.</para>
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</formalpara>
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<variablelist>
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<varlistentry>
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<term>Query option</term>
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<listitem>
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<para>Use <option>query_scope</option>
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to control the scope level of data
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presented (search only the first level or search an entire
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sub-tree) through LDAP.</para>
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<para>Use <option>page_size</option> to control the maximum
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results per page. A value of zero disables paging.</para>
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<para>Use <option>alias_dereferencing</option> to control
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the LDAP dereferencing option for queries.</para>
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<para>Use <option>chase_referrals</option> to override the
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system's default referral chasing behavior for queries.</para>
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<programlisting language="ini">[ldap]
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query_scope = sub
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page_size = 0
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alias_dereferencing = default
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chase_referrals = </programlisting>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Debug</term>
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<listitem>
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<para>Use <option>debug_level</option> to set
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the LDAP debugging level for LDAP calls. A value of zero means that
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debugging is not enabled.</para>
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<programlisting language="ini">[ldap]
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debug_level = 0</programlisting>
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<warning><para>This value is a bitmask, consult your LDAP
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documentation for possible values.</para></warning>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Connection pooling</term>
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<listitem>
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<para>Use <option>use_pool</option> to enable LDAP connection
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pooling. Configure connection pool size, maximum retry,
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reconnect trials, timeout (-1 indicates indefinite
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wait) and lifetime in seconds.</para>
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<programlisting language="ini">[ldap]
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use_pool = true
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pool_size = 10
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pool_retry_max = 3
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pool_retry_delay = 0.1
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pool_connection_timeout = -1
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pool_connection_lifetime = 600</programlisting>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>Connection pooling for end user authentication</term>
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<listitem>
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<para>Use <option>use_auth_pool</option> to enable LDAP
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connection pooling for end user authentication.
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Configure connection pool size and lifetime in seconds.</para>
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<programlisting language="ini">[ldap]
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use_auth_pool = false
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auth_pool_size = 100
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auth_pool_connection_lifetime = 60</programlisting>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>When you have finished configuration, restart the Openstack Identity service:</para>
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<screen><prompt>#</prompt> <userinput>service keystone restart</userinput></screen>
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<warning><para>During service restart, authentication and
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authorization are unavailable.</para></warning>
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<xi:include href="section_keystone_config_ldap-identity.xml"/>
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<xi:include href="section_keystone_config_ldap-assignments.xml"/>
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<xi:include href="section_keystone_config_ldap-hardening.xml"/>
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</section>
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