mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
.. | ||
ldapdb.c | ||
README |
LDAP auxprop plugin for SASL-enabled servers. Copyright (C) 2002,2003 by Howard Chu, hyc@symas.com This software is licensed under the terms of the OpenLDAP license. The file ldapdb.c was written for Cyrus SASL 2.1.3 and OpenLDAP 2.1.3. Due to various bugs in the Cyrus source you should use Cyrus SASL 2.1.15 or newer. The version of ldapdb bundled with OpenLDAP 2.1.22 and older will work with all OpenLDAP releases 2.1.3 and up. The ldapdb in OpenLDAP 2.1.23 uses a different LDAP request and requires the server to be 2.1.23 or newer. It can be compiled by copying into the Cyrus SASL source tree, in the plugins subdirectory. No configuration or build script is provided. To compile, type "make ldapdb.lo". To link, you'll have to copy the link rule for one of the other plugins. Below is a sample on my Linux system: /bin/sh ../libtool --mode=link gcc -Wall -W -g -O2 -L/usr/local/lib -Wl,-rpath,/usr/local/lib -module -export-dynamic -rpath /usr/lib/sasl2 -o libldapdb.la -version-info 2:4:0 ldapdb.lo -lldap -llber -lssl -lcrypto Once installed, you need to add some config items to the SASL server's config file in /usr/lib/sasl2. For example: ldapdb_uri: ldap://ldap.example.com ldapdb_id: root ldapdb_pw: secret ldapdb_mech: DIGEST-MD5 This config assumes an LDAP server on the same machine as the server that is using SASL. The LDAP server must be configured to map the SASL authcId "root" into a DN that has proxy authorization privileges to every account that is allowed to login to this server. (See the OpenLDAP Admin Guide section 10 for details.) Unlike other LDAP-enabled plugins for other services that are common on the web, this plugin does not require you to configure DN search patterns to map usernames to LDAP DNs. This plugin requires SASL name mapping to be configured on the target slapd. This approach keeps the LDAP-specific configuration details in one place, the slapd.conf, and makes the configuration of remote services much simpler. An additional keyword "ldapdb_rc" may be specified in the config file. The filename specified here will be put into the server's LDAPRC environment variable, and libldap-specific config options may be set in that ldaprc file. The main purpose behind this option is to allow a client TLS certificate to be configured, so that SASL/EXTERNAL may be used between the SASL server and the LDAP server. This is the most optimal way to use this plugin when the servers are on separate machines. Note: this plugin is not for use with slapd itself. When OpenLDAP is built with SASL support, slapd uses its own internal auxprop module. By default, without configuring anything else, slapd will fail to load the ldapdb module when it's present. This is as it should be. If you don't like the "auxpropfunc: error -7" message that is sent to syslog by slapd, you can stop it by creating /usr/lib/sasl2/slapd.conf with: auxprop_plugin: slapd which will force the SASL library to ignore all other auxprop modules. This plugin has been in use for over a year at many sites with good results. If you have questions or problems, please send feedback via the openldap-software mailing list. -- Howard Chu Update... With OpenLDAP 2.1.13 you can use SASL/EXTERNAL on ldapi://. This is fast and secure, and needs no username or password to be stored. The SASL config file is just ldapdb_uri: ldapi:// ldapdb_mech: EXTERNAL The slapd.conf will need to map these usernames to LDAP DNs: sasl-regexp uidNumber=(.*)\\+gidNumber=(.*),cn=peercred,cn=external,cn=auth ldap:///dc=example,dc=com??sub?(&(uidNumber=$1)(gidNumber=$2)) sasl-regexp uid=(.*),cn=external,cn=auth ldap:///dc=example,dc=com??sub?(uid=$1) Update... With OpenLDAP 2.1.23 you can use the ldapdb_starttls keyword to use the StartTLS extended operation on an LDAP session. This item may be set to either "try" or "demand", e.g.: ldapdb_uri: ldap://ldap.example.com ldapdb_starttls: try When set to "try" any failure in StartTLS is ignored. When set to "demand" then any failure aborts the connection.