ext_ldap_group_acl(8)ext_ldap_group_acl(8)NAMEext_ldap_group_acl - Squid LDAP external acl group helper
Version 2.17
SYNOPSISext_ldap_group_acl-b base DN LDAP search filter options ] [ LDAP
server name [: port ]| URI ]...
DESCRIPTIONext_ldap_group_acl allows Squid to connect to a LDAP directory to
authorize users via LDAP groups. LDAP options are specified as parame‐
ters on the command line, while the username(s) and group(s) to be
checked against the LDAP directory are specified on subsequent lines of
input to the helper, one username/group pair per line separated by a
space.
As expected by the external_acl_type construct of Squid, after specify‐
ing a username and group followed by a new line, this helper will pro‐
duce either OK or ERR on the following line to show if the user is a
member of the specified group.
The program operates by searching with a search filter based on the
users user name and requested group, and if a match is found it is
determined that the user belongs to the group.
OPTIONS-a never|always|search|find
When to dereference aliases. Defaults to 'never'
never dereference aliases (default), always dereference
aliases, only while searching or only to find the base
object
-b basedn REQUIRED. Specifies the base DN under which the groups are
located.
-B basedn Specifies the base DN under which the users are located (if
different)
-c connect_timeout
Specify timeout used when connecting to LDAP servers
(requires Netscape LDAP API libraries)
-d Debug mode where each step taken will get reported in
detail. Useful for understanding what goes wrong if the
result is not what was expected.
-D binddn -w password
The DN and password to bind as while performing searches.
Required if the LDAP directory does not allow anonymous
searches.
As the password needs to be printed in plain text in your
Squid configuration and will be sent on the command line to
the helper it is strongly recommended to use a account with
minimal associated privileges. This to limit the damage in
case someone could get hold of a copy of your Squid config‐
uration file or extracts the password used from a process
listing.
-D binddn -W secretfile
The DN and the name of a file containing the password to
bind as while performing searches.
Less insecure version of the former parameter pair with two
advantages: The password does not occur in the process
listing, and the password is not being compromised if some‐
one gets the squid configuration file without getting the
secretfile.
-Ecertpath Enable LDAP over SSL (requires Netscape LDAP API libraries)
-f filter LDAP search filter used to search the LDAP directory for
any matching group memberships. In the filter %u will be
replaced by the user name (or DN if the -F or -u options
are used) and %g by the requested group name.
-F filter LDAP search filter used to search the LDAP directory for
any matching users. In the filter %s will be replaced by
the user name. If % is to be included literally in the fil‐
ter then use %%
-g Specifies that the first query argument sent to the helper
by Squid is a extension to the basedn and will be temporar‐
ily added in front of the global basedn for this query.
-h ldapserver
Specify the LDAP server to connect to
-H ldapuri Specity the LDAP server to connect to by a LDAP URI
(requires OpenLDAP libraries)
-K Strip Kerberos Realm component from user names (@ sepa‐
rated)
-p ldapport Specify an alternate TCP port where the LDAP server is lis‐
tening if other than the default LDAP port 389.
-P Use a persistent LDAP connection. Normally the LDAP connec‐
tion is only open while verifying a users group membership
to preserve resources at the LDAP server. This option
causes the LDAP connection to be kept open, allowing it to
be reused for further user validations. Recommended for
larger installations.
-R Do not follow referrals
-s base|one|sub
search scope. Defaults to sub
base object only,
one level below the base object or
subtree below the base object
-S Strip NT domain name component from user names (/ or \ sep‐
arated)
-t search_timeout
Specify time limit on LDAP search operations
-u attr LDAP attribute used to construct the user DN from the user
name and base dn without needing to search for the user. A
maximum of 16 occurrences of %s are supported.
-v 2|3 LDAP protocol version. Defaults to 3 if not specified.
-Z Use TLS encryption
CONFIGURATION
This helper is intended to be used as an external_acl_type helper in
squid.conf .
external_acl_type ldap_group %LOGIN /path/to/ext_ldap_group_acl
...
acl group1 external ldap_group Group1
acl group2 external ldap_group Group2
NOTE: When constructing search filters it is recommended to first test
the filter using ldapsearch to verify that the filter matches what you
expect before you attempt to use ext_ldap_group_aclAUTHOR
This program was written by Flavio Pescuma <flavio@marasystems.com>
Henrik Nordstrom <hno@squid-cache.org>
Based on prior work in squid_ldap_auth by Glen Newton <glen.new‐
ton@nrc.ca>
This manual was written by Henrik Nordstrom <hno@marasystems.com>
COPYRIGHT
This program and documentation is copyright to the authors named above.
Distributed under the GNU General Public License (GNU GPL) version 2 or
later (GPLv2+).
QUESTIONS
Questions on the usage of this program can be sent to the Squid Users
mailing list <squid-users@squid-cache.org>
Or contact your favorite LDAP list/friend if the question is more
related to LDAP than Squid.
REPORTING BUGS
Bug reports need to be made in English. See http://wiki.squid-
cache.org/SquidFaq/BugReporting for details of what you need to include
with your bug report.
Report bugs or bug fixes using http://bugs.squid-cache.org/
Report serious security bugs to Squid Bugs <squid-bugs@squid-cache.org>
Report ideas for new improvements to the Squid Developers mailing list
<squid-dev@squid-cache.org>
SEE ALSOsquid(8), basic_ldap_auth(8), ldapsearch(1), GPL(7),
Your favorite LDAP documentation
RFC2254 - The String Representation of LDAP Search Filters,
The Squid FAQ wiki http://wiki.squid-cache.org/SquidFaq
The Squid Configuration Manual http://www.squid-cache.org/Doc/config/
30 January 2005 ext_ldap_group_acl(8)
