ext_session_acl(8) System Manager's Manual ext_session_acl(8)
NAME
ext_session_acl - Squid session tracking external acl helper.
Version 1.2
SYNOPSIS
ext_session_acl [-t timeout ] [-b database ] [-a]
DESCRIPTION
ext_session_acl maintains a concept of sessions by monitoring requests
and timing out sessions. The timeout is based either on idle use ( -t )
or a fixed period of time ( -T ). The former is suitable for displaying
terms and conditions to a user; the latter is suitable for the display
of advertisements or other notices (both as a splash page - see config
examples in the wiki online). The session helper can also be used to
force users to re-authenticate if the %LOGIN and -a are both used.
OPTIONS
-t timeout Idle timeout for any session. The default if not specified
(set to 3600 seconds).
-T timeout Fixed timeout for any session. This will end the session
after the timeout regardless of a user's activity. If used
with active mode, this will terminate the user's session
after timeout , after which another LOGIN will be required.
LOGOUT will reset the session and timeout.
-b path Path to persistent database. If a file is specified then
that single file is used as the database. If a path is
specified, a Berkeley DB database environment is created
within the directory. The advantage of the latter is better
database support between multiple instances of the session
helper. Using multiple instances of the session helper with
a single database file will cause synchronization problems
between processes. If this option is not specified the
session details will be kept in memory only and all ses-
sions will reset each time Squid restarts its helpers
(Squid restart or rotation of logs).
-a Active mode. In this mode sessions are started by evaluat-
ing an acl with the argument LOGIN , or terminated by the
argument LOGOUT . Without this flag the helper automati-
cally starts the session after the first request.
CONFIGURATION
The ext_session_acl helper is a concurrent helper; therefore, the con-
currency= option must be specified in the configuration.
Passive session configuration example using the default automatic mode
external_acl_type session ttl=300 negative_ttl=0 children=1 con-
currency=200 %LOGIN /usr/local/squid/libexec/ext_session_acl
acl session external session
http_access deny !session
deny_info http://your.server.example.com/bannerpage?url=%s ses-
sion
Then set up http://your.server.example.com/bannerpage to display a ses-
sion startup page and then redirect the user back to the requested URL
given in the url query parameter.
AUTHOR
This program and documentation was written by Henrik Nordstrom <hen-
rik@henriknordstrom.net> Andrew Beverley <andy@andybev.com>
COPYRIGHT
* Copyright (C) 1996-2023 The Squid Software Foundation and contribu-
tors
*
* 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 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@lists.squid-cache.org>
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@lists.squid-
cache.org>
Report ideas for new improvements to the Squid Developers mailing list
<squid-dev@lists.squid-cache.org>
SEE ALSO
squid(8), GPL(7),
The Squid FAQ wiki http://wiki.squid-cache.org/SquidFaq
The Squid Configuration Manual http://www.squid-cache.org/Doc/config/
9 October 2011 ext_session_acl(8)
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