1squid_ldap_group(8) System Manager's Manual squid_ldap_group(8)
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6 squid_ldap_group - Squid LDAP external acl group helper
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9 squid_ldap_group -b "base DN" -f "LDAP search filter" [options]
10 [ldap_server_name[:port]|URI]...
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13 This helper allows Squid to connect to a LDAP directory to authorize
14 users via LDAP groups. LDAP options are specified as parameters on the
15 command line, while the username(s) and group(s) to be checked against
16 the LDAP directory are specified on subsequent lines of input to the
17 helper, one username/group pair per line separated by a space.
18 As expected by the external_acl construct of Squid, after specifying a
20 username and group followed by a new line, this helper will produce
21 either OK or ERR on the following line to show if the user is a member
22 of the specified group.
23 The program operates by searching with a search filter based on the
25 users user name and requested group, and if a match is found it is
26 determined that the user belongs to the group.
27 -b basedn (REQUIRED)
29 Specifies the base DN under which the groups are located.
30 -B basedn
32 Specifies the base DN under which the users are located (if dif‐
33 ferent)
34 -g Specifies that the first query argument sent to the helper by
36 Squid is a extension to the basedn and will be temporarily added
37 in front of the global basedn for this query.
38 -f filter
40 LDAP search filter used to search the LDAP directory for any
41 matching group memberships. In the filter %u will be replaced
42 by the user name (or DN if the -F or -u options are used) and %g
43 by the requested group name.
44 -F filter
46 LDAP search filter used to search the LDAP directory for any
47 matching users. In the filter %s will be replaced by the user
48 name. If % is to be included literally in the filter then use
49 %%.
50 -u attr
52 LDAP attribute used to construct the user DN from the user name
53 and base dn without needing to search for the user.
54 -s base|one|sub
56 search scope. Defaults to 'sub'.
57 base object only, one level below the base object or subtree
59 below the base object
60 -D binddn -w password
62 The DN and password to bind as while performing searches.
63 Required if the directory does not allow anonymous searches.
64 As the password needs to be printed in plain text in your Squid
66 configuration and will be sent on the command line to the helper
67 it is strongly recommended to use a account with minimal associ‐
68 ated privileges. This to limit the damage in case someone could
69 get hold of a copy of your Squid configuration file or extracts
70 the password used from a process listing.
71 -D binddn -W secretfile
73 The DN and the name of a file containing the password to bind as
74 while performing searches.
75 Less insecure version of the former parameter pair with two
77 advantages: The password does not occur in the process listing,
78 and the password is not being compromised if someone gets the
79 squid configuration file without getting the secretfile.
80 -P Use a persistent LDAP connection. Normally the LDAP connection
82 is only open while verifying a users group membership to pre‐
83 serve resources at the LDAP server. This option causes the LDAP
84 connection to be kept open, allowing it to be reused for further
85 user validations. Recommended for larger installations.
86 -R do not follow referrals
88 -a never|always|search|find
90 when to dereference aliases. Defaults to 'never'
91 never dereference aliases (default), always dereference aliases,
93 only while searching or only to find the base object
94 -H ldapuri
96 Specity the LDAP server to connect to by a LDAP URI (requires
97 OpenLDAP libraries)
98 -h ldapserver
100 Specify the LDAP server to connect to
101 -p ldapport
103 Specify an alternate TCP port where the ldap server is listening
104 if other than the default LDAP port 389.
105 -v 2|3 LDAP protocol version. Defaults to 3 if not specified.
107 -Z Use TLS encryption
109 -Ecertpath
111 Enable LDAP over SSL (requires Netscape LDAP API libraries)
112 -cconnect_timeout
114 Specify timeout used when connecting to LDAP servers (requires
115 Netscape LDAP API libraries)
116 -tsearch_timeout
118 Specify time limit on LDAP search operations
119 -S Strip NT domain name component from user names (/ or \ sepa‐
121 rated)
122 -K Strip Kerberos Realm component from user names (@ separated)
124 -d Debug mode where each step taken will get reported in detail.
126 Useful for understanding what goes wrong if the results is not
127 what is expected.
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131 This helper is intended to be used as a external_acl_type helper from
132 squid.conf.
133 external_acl_type ldap_group %LOGIN /path/to/squid_ldap_group ...
135 acl group1 external ldap_group Group1
136 acl group2 external ldap_group Group2
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139 When constructing search filters it is recommended to first test the
140 filter using ldapsearch before you attempt to use squid_ldap_group.
141 This to verify that the filter matches what you expect.
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144 This manual page was written by Henrik Nordstrom <hno@marasystems.com>
145 squid_ldap_group is written by Flavio Pescuma <flavio@marasystems.com>
147 and Henrik Nordstrom <hno@squid-cache.org>, based on prior work in
148 squid_ldap_auth by Glen Newton <glen.newton@nrc.ca>
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151 Max 16 occurrences of %s in the -u argument is supported.
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154 Any questions on usage can be sent to Squid Users <squid-users@squid-
155 cache.org>, or to your favorite LDAP list/friend if the question is
156 more related to LDAP than Squid.
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159 Report bugs or bug-fixes to Squid Bugs <squid-bugs@squid-cache.org> or
160 ideas for new improvements to Squid Developers <squid-dev@squid-
161 cache.org>
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164 squid_ldap_auth(8), ldapsearch(1),
165 Your favorite LDAP documentation
166 RFC2254 - The String Representation of LDAP Search Filters,
167Version 2.17 30 January 2005 squid_ldap_group(8)