EXT_KERBEROS_SID_GROUP_ACL(8)

NAME
 ext_kerberos_sid_group_acl - external ACL helper for Squid to verify AD Domain group membership using sid.

SYNOPSIS
 ext_kerberos_sid_group_acl [-d] [-h] -p Principal Name -D Domain Controller -b Base DN -G Group1:Group2

DESCRIPTION
ext_kerberos_sid_group_acl is an installed executable script. It uses ldapsearch from Openldap to lookup the name of a AD group sid.

This helper must be used in with the negotiate_kerberos_auth helper in a Microsoft AD or Samba environment.

It reads from the standard input the domain username and a list of group sids and tries to match the group SIDs to the AD group sids.

OPTIONS

-d  Write debug info to stderr.

-h  Print the help.

-p principal name
    Principal name in squid keytab to use for ldap authentication to AD

-D domain controller
    Domain controller to contact to lookup group SID

-b base DN
    Base DN for ldap search

-G AD group name
    AD group name to be used for SID lookup. List separated by a colon (:)

CONFIGURATION
  auth_param negotiate program /path/to/negotiate_wrapper_auth -d \
       --ntlm /path/to/ntlm_auth --helper-protocol=squid-2.5-ntlmssp --domain example.com \
       --kerberos /path/to/negotiate_kerberos_auth -d -s GSS_C_NO_NAME -k /path/to/squid.keytab -t none
  external_acl_type sid_check %LOGIN %note{group} /path/to/kerberos_sid_group_acl -p principal -D dc1.example.com -b "DC=example,DC=com" -G Group1:Group2
  acl squid_allow external sid_check
  acl allowed_group external sid_check
  http_access allow allowed_group

If the local perl interpreter is in a unusual location it may need to be added:

  external_acl_type sid_check %LOGIN %note{group} /path/to/perl /path/to/kerberos_sid_group_acl -p principal -D dc1.example.com -b "DC=example,DC=com" -G Group1:Group2

AUTHOR
This program was written by Markus Moeller <markus_moeller@compuserve.com>

This manual was written by Markus Moeller <markus_moeller@compuserve.com>

COPYRIGHT
 * Copyright (C) 1996-2026 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.

 This program is put in the public domain by Markus Moeller
 <markus_moeller@compuserve.com>. It is distributed in the hope that it will
 be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

QUESTIONS
Questions on the usage of this program can be sent to the Squid Users mailing list <squid-users@lists.squid-cache.org>

REPORTING BUGS
Bug reports need to be made in English. See https://wiki.squid-cache.org/SquidFaq/BugReporting for details of what you need to include with your bug report.

Report bugs or bug fixes using https://bugs.squid-cache.org/

Report serious security bugs to Squid Bugs <squid-bugs@lists.squid-cache.org>

Report ideas for new improvements to the Squid Developers mailing list <squid-dev@lists.squid-cache.org>

SEE ALSO
negotiate_kerberos_auth(8)

The Squid FAQ wiki https://wiki.squid-cache.org/SquidFaq

The Squid Configuration Manual http://www.squid-cache.org/Doc/config/