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squid.conf with PAM authentication for squid3 - tested on Ubuntu 16.04
# WELCOME TO SQUID 3.5.12
# ----------------------------
#
# This is the documentation for the Squid configuration file.
# This documentation can also be found online at:
# http://www.squid-cache.org/Doc/config/
#
# You may wish to look at the Squid home page and wiki for the
# FAQ and other documentation:
# http://www.squid-cache.org/
# http://wiki.squid-cache.org/SquidFaq
# http://wiki.squid-cache.org/ConfigExamples
#
# This documentation shows what the defaults for various directives
# happen to be. If you don't need to change the default, you should
# leave the line out of your squid.conf in most cases.
#
# In some cases "none" refers to no default setting at all,
# while in other cases it refers to the value of the option
# - the comments for that keyword indicate if this is the case.
#
# Configuration options can be included using the "include" directive.
# Include takes a list of files to include. Quoting and wildcards are
# supported.
#
# For example,
#
# include /path/to/included/file/squid.acl.config
#
# Includes can be nested up to a hard-coded depth of 16 levels.
# This arbitrary restriction is to prevent recursive include references
# from causing Squid entering an infinite loop whilst trying to load
# configuration files.
#
# Values with byte units
#
# Squid accepts size units on some size related directives. All
# such directives are documented with a default value displaying
# a unit.
#
# Units accepted by Squid are:
# bytes - byte
# KB - Kilobyte (1024 bytes)
# MB - Megabyte
# GB - Gigabyte
#
# Values with spaces, quotes, and other special characters
#
# Squid supports directive parameters with spaces, quotes, and other
# special characters. Surround such parameters with "double quotes". Use
# the configuration_includes_quoted_values directive to enable or
# disable that support.
#
# Squid supports reading configuration option parameters from external
# files using the syntax:
# parameters("/path/filename")
# For example:
# acl whitelist dstdomain parameters("/etc/squid/whitelist.txt")
#
# Conditional configuration
#
# If-statements can be used to make configuration directives
# depend on conditions:
#
# if <CONDITION>
# ... regular configuration directives ...
# [else
# ... regular configuration directives ...]
# endif
#
# The else part is optional. The keywords "if", "else", and "endif"
# must be typed on their own lines, as if they were regular
# configuration directives.
#
# NOTE: An else-if condition is not supported.
#
# These individual conditions types are supported:
#
# true
# Always evaluates to true.
# false
# Always evaluates to false.
# <integer> = <integer>
# Equality comparison of two integer numbers.
#
#
# SMP-Related Macros
#
# The following SMP-related preprocessor macros can be used.
#
# ${process_name} expands to the current Squid process "name"
# (e.g., squid1, squid2, or cache1).
#
# ${process_number} expands to the current Squid process
# identifier, which is an integer number (e.g., 1, 2, 3) unique
# across all Squid processes of the current service instance.
#
# ${service_name} expands into the current Squid service instance
# name identifier which is provided by -n on the command line.
#
# TAG: broken_vary_encoding
# This option is not yet supported by Squid-3.
#Default:
# none
# TAG: cache_vary
# This option is not yet supported by Squid-3.
#Default:
# none
# TAG: error_map
# This option is not yet supported by Squid-3.
#Default:
# none
# TAG: external_refresh_check
# This option is not yet supported by Squid-3.
#Default:
# none
# TAG: location_rewrite_program
# This option is not yet supported by Squid-3.
#Default:
# none
# TAG: refresh_stale_hit
# This option is not yet supported by Squid-3.
#Default:
# none
# TAG: hierarchy_stoplist
# Remove this line. Use always_direct or cache_peer_access ACLs instead if you need to prevent cache_peer use.
#Default:
# none
# TAG: log_access
# Remove this line. Use acls with access_log directives to control access logging
#Default:
# none
# TAG: log_icap
# Remove this line. Use acls with icap_log directives to control icap logging
#Default:
# none
# TAG: ignore_ims_on_miss
# Remove this line. The HTTP/1.1 feature is now configured by 'cache_miss_revalidate'.
#Default:
# none
# TAG: chunked_request_body_max_size
# Remove this line. Squid is now HTTP/1.1 compliant.
#Default:
# none
# TAG: dns_v4_fallback
# Remove this line. Squid performs a 'Happy Eyeballs' algorithm, the 'fallback' algorithm is no longer relevant.
#Default:
# none
# TAG: emulate_httpd_log
# Replace this with an access_log directive using the format 'common' or 'combined'.
#Default:
# none
# TAG: forward_log
# Use a regular access.log with ACL limiting it to MISS events.
#Default:
# none
# TAG: ftp_list_width
# Remove this line. Configure FTP page display using the CSS controls in errorpages.css instead.
#Default:
# none
# TAG: ignore_expect_100
# Remove this line. The HTTP/1.1 feature is now fully supported by default.
#Default:
# none
# TAG: log_fqdn
# Remove this option from your config. To log FQDN use %>A in the log format.
#Default:
# none
# TAG: log_ip_on_direct
# Remove this option from your config. To log server or peer names use %<A in the log format.
#Default:
# none
# TAG: maximum_single_addr_tries
# Replaced by connect_retries. The behaviour has changed, please read the documentation before altering.
#Default:
# none
# TAG: referer_log
# Replace this with an access_log directive using the format 'referrer'.
#Default:
# none
# TAG: update_headers
# Remove this line. The feature is supported by default in storage types where update is implemented.
#Default:
# none
# TAG: url_rewrite_concurrency
# Remove this line. Set the 'concurrency=' option of url_rewrite_children instead.
#Default:
# none
# TAG: useragent_log
# Replace this with an access_log directive using the format 'useragent'.
#Default:
# none
# TAG: dns_testnames
# Remove this line. DNS is no longer tested on startup.
#Default:
# none
# TAG: extension_methods
# Remove this line. All valid methods for HTTP are accepted by default.
#Default:
# none
# TAG: zero_buffers
#Default:
# none
# TAG: incoming_rate
#Default:
# none
# TAG: server_http11
# Remove this line. HTTP/1.1 is supported by default.
#Default:
# none
# TAG: upgrade_http0.9
# Remove this line. ICY/1.0 streaming protocol is supported by default.
#Default:
# none
# TAG: zph_local
# Alter these entries. Use the qos_flows directive instead.
#Default:
# none
# TAG: header_access
# Since squid-3.0 replace with request_header_access or reply_header_access
# depending on whether you wish to match client requests or server replies.
#Default:
# none
# TAG: httpd_accel_no_pmtu_disc
# Since squid-3.0 use the 'disable-pmtu-discovery' flag on http_port instead.
#Default:
# none
# TAG: wais_relay_host
# Replace this line with 'cache_peer' configuration.
#Default:
# none
# TAG: wais_relay_port
# Replace this line with 'cache_peer' configuration.
#Default:
# none
# OPTIONS FOR SMP
# -----------------------------------------------------------------------------
# TAG: workers
# Number of main Squid processes or "workers" to fork and maintain.
# 0: "no daemon" mode, like running "squid -N ..."
# 1: "no SMP" mode, start one main Squid process daemon (default)
# N: start N main Squid process daemons (i.e., SMP mode)
#
# In SMP mode, each worker does nearly all what a single Squid daemon
# does (e.g., listen on http_port and forward HTTP requests).
#Default:
# SMP support disabled.
# TAG: cpu_affinity_map
# Usage: cpu_affinity_map process_numbers=P1,P2,... cores=C1,C2,...
#
# Sets 1:1 mapping between Squid processes and CPU cores. For example,
#
# cpu_affinity_map process_numbers=1,2,3,4 cores=1,3,5,7
#
# affects processes 1 through 4 only and places them on the first
# four even cores, starting with core #1.
#
# CPU cores are numbered starting from 1. Requires support for
# sched_getaffinity(2) and sched_setaffinity(2) system calls.
#
# Multiple cpu_affinity_map options are merged.
#
# See also: workers
#Default:
# Let operating system decide.
# OPTIONS FOR AUTHENTICATION
# -----------------------------------------------------------------------------
# TAG: auth_param
# This is used to define parameters for the various authentication
# schemes supported by Squid.
#
# format: auth_param scheme parameter [setting]
#
# The order in which authentication schemes are presented to the client is
# dependent on the order the scheme first appears in config file. IE
# has a bug (it's not RFC 2617 compliant) in that it will use the basic
# scheme if basic is the first entry presented, even if more secure
# schemes are presented. For now use the order in the recommended
# settings section below. If other browsers have difficulties (don't
# recognize the schemes offered even if you are using basic) either
# put basic first, or disable the other schemes (by commenting out their
# program entry).
#
# Once an authentication scheme is fully configured, it can only be
# shutdown by shutting squid down and restarting. Changes can be made on
# the fly and activated with a reconfigure. I.E. You can change to a
# different helper, but not unconfigure the helper completely.
#
# Please note that while this directive defines how Squid processes
# authentication it does not automatically activate authentication.
# To use authentication you must in addition make use of ACLs based
# on login name in http_access (proxy_auth, proxy_auth_regex or
# external with %LOGIN used in the format tag). The browser will be
# challenged for authentication on the first such acl encountered
# in http_access processing and will also be re-challenged for new
# login credentials if the request is being denied by a proxy_auth
# type acl.
#
# WARNING: authentication can't be used in a transparently intercepting
# proxy as the client then thinks it is talking to an origin server and
# not the proxy. This is a limitation of bending the TCP/IP protocol to
# transparently intercepting port 80, not a limitation in Squid.
# Ports flagged 'transparent', 'intercept', or 'tproxy' have
# authentication disabled.
#
# === Parameters common to all schemes. ===
#
# "program" cmdline
# Specifies the command for the external authenticator.
#
# By default, each authentication scheme is not used unless a
# program is specified.
#
# See http://wiki.squid-cache.org/Features/AddonHelpers for
# more details on helper operations and creating your own.
#
# "key_extras" format
# Specifies a string to be append to request line format for
# the authentication helper. "Quoted" format values may contain
# spaces and logformat %macros. In theory, any logformat %macro
# can be used. In practice, a %macro expands as a dash (-) if
# the helper request is sent before the required macro
# information is available to Squid.
#
# By default, Squid uses request formats provided in
# scheme-specific examples below (search for %credentials).
#
# The expanded key_extras value is added to the Squid credentials
# cache and, hence, will affect authentication. It can be used to
# autenticate different users with identical user names (e.g.,
# when user authentication depends on http_port).
#
# Avoid adding frequently changing information to key_extras. For
# example, if you add user source IP, and it changes frequently
# in your environment, then max_user_ip ACL is going to treat
# every user+IP combination as a unique "user", breaking the ACL
# and wasting a lot of memory on those user records. It will also
# force users to authenticate from scratch whenever their IP
# changes.
#
# "realm" string
# Specifies the protection scope (aka realm name) which is to be
# reported to the client for the authentication scheme. It is
# commonly part of the text the user will see when prompted for
# their username and password.
#
# For Basic the default is "Squid proxy-caching web server".
# For Digest there is no default, this parameter is mandatory.
# For NTLM and Negotiate this parameter is ignored.
#
# "children" numberofchildren [startup=N] [idle=N] [concurrency=N]
#
# The maximum number of authenticator processes to spawn. If
# you start too few Squid will have to wait for them to process
# a backlog of credential verifications, slowing it down. When
# password verifications are done via a (slow) network you are
# likely to need lots of authenticator processes.
#
# The startup= and idle= options permit some skew in the exact
# amount run. A minimum of startup=N will begin during startup
# and reconfigure. Squid will start more in groups of up to
# idle=N in an attempt to meet traffic needs and to keep idle=N
# free above those traffic needs up to the maximum.
#
# The concurrency= option sets the number of concurrent requests
# the helper can process. The default of 0 is used for helpers
# who only supports one request at a time. Setting this to a
# number greater than 0 changes the protocol used to include a
# channel ID field first on the request/response line, allowing
# multiple requests to be sent to the same helper in parallel
# without waiting for the response.
#
# Concurrency must not be set unless it's known the helper
# supports the input format with channel-ID fields.
#
# NOTE: NTLM and Negotiate schemes do not support concurrency
# in the Squid code module even though some helpers can.
#
#
#
# === Example Configuration ===
#
# This configuration displays the recommended authentication scheme
# order from most to least secure with recommended minimum configuration
# settings for each scheme:
#
##auth_param negotiate program <uncomment and complete this line to activate>
##auth_param negotiate children 20 startup=0 idle=1
##auth_param negotiate keep_alive on
##
##auth_param digest program <uncomment and complete this line to activate>
##auth_param digest children 20 startup=0 idle=1
##auth_param digest realm Squid proxy-caching web server
##auth_param digest nonce_garbage_interval 5 minutes
##auth_param digest nonce_max_duration 30 minutes
##auth_param digest nonce_max_count 50
##
##auth_param ntlm program <uncomment and complete this line to activate>
##auth_param ntlm children 20 startup=0 idle=1
##auth_param ntlm keep_alive on
##
auth_param basic program /usr/lib/squid3/basic_pam_auth
auth_param basic children 5
auth_param basic realm Squid
auth_param basic credentialsttl 2 hours
acl pam proxy_auth REQUIRED
http_access allow pam
#Default:
# none
# TAG: authenticate_cache_garbage_interval
# The time period between garbage collection across the username cache.
# This is a trade-off between memory utilization (long intervals - say
# 2 days) and CPU (short intervals - say 1 minute). Only change if you
# have good reason to.
#Default:
# authenticate_cache_garbage_interval 1 hour
# TAG: authenticate_ttl
# The time a user & their credentials stay in the logged in
# user cache since their last request. When the garbage
# interval passes, all user credentials that have passed their
# TTL are removed from memory.
#Default:
# authenticate_ttl 1 hour
# TAG: authenticate_ip_ttl
# If you use proxy authentication and the 'max_user_ip' ACL,
# this directive controls how long Squid remembers the IP
# addresses associated with each user. Use a small value
# (e.g., 60 seconds) if your users might change addresses
# quickly, as is the case with dialup. You might be safe
# using a larger value (e.g., 2 hours) in a corporate LAN
# environment with relatively static address assignments.
#Default:
# authenticate_ip_ttl 1 second
# ACCESS CONTROLS
# -----------------------------------------------------------------------------
# TAG: external_acl_type
# This option defines external acl classes using a helper program
# to look up the status
#
# external_acl_type name [options] FORMAT.. /path/to/helper [helper arguments..]
#
# Options:
#
# ttl=n TTL in seconds for cached results (defaults to 3600
# for 1 hour)
#
# negative_ttl=n
# TTL for cached negative lookups (default same
# as ttl)
#
# grace=n Percentage remaining of TTL where a refresh of a
# cached entry should be initiated without needing to
# wait for a new reply. (default is for no grace period)
#
# cache=n Limit the result cache size, default is 262144.
# The expanded FORMAT value is used as the cache key, so
# if the details in FORMAT are highly variable a larger
# cache may be needed to produce reduction in helper load.
#
# children-max=n
# Maximum number of acl helper processes spawned to service
# external acl lookups of this type. (default 20)
#
# children-startup=n
# Minimum number of acl helper processes to spawn during
# startup and reconfigure to service external acl lookups
# of this type. (default 0)
#
# children-idle=n
# Number of acl helper processes to keep ahead of traffic
# loads. Squid will spawn this many at once whenever load
# rises above the capabilities of existing processes.
# Up to the value of children-max. (default 1)
#
# concurrency=n concurrency level per process. Only used with helpers
# capable of processing more than one query at a time.
#
# protocol=2.5 Compatibility mode for Squid-2.5 external acl helpers.
#
# ipv4 / ipv6 IP protocol used to communicate with this helper.
# The default is to auto-detect IPv6 and use it when available.
#
#
# FORMAT specifications
#
# %LOGIN Authenticated user login name
# %un A user name. Expands to the first available name
# from the following list of information sources:
# - authenticated user name, like %ul or %LOGIN
# - user name sent by an external ACL, like %EXT_USER
# - SSL client name, like %us in logformat
# - ident user name, like %ui in logformat
# %EXT_USER Username from previous external acl
# %EXT_LOG Log details from previous external acl
# %EXT_TAG Tag from previous external acl
# %IDENT Ident user name
# %SRC Client IP
# %SRCPORT Client source port
# %URI Requested URI
# %DST Requested host
# %PROTO Requested URL scheme
# %PORT Requested port
# %PATH Requested URL path
# %METHOD Request method
# %MYADDR Squid interface address
# %MYPORT Squid http_port number
# %PATH Requested URL-path (including query-string if any)
# %USER_CERT SSL User certificate in PEM format
# %USER_CERTCHAIN SSL User certificate chain in PEM format
# %USER_CERT_xx SSL User certificate subject attribute xx
# %USER_CA_CERT_xx SSL User certificate issuer attribute xx
# %ssl::>sni SSL client SNI sent to Squid
# %ssl::<cert_subject SSL server certificate DN
# %ssl::<cert_issuer SSL server certificate issuer DN
#
# %>{Header} HTTP request header "Header"
# %>{Hdr:member}
# HTTP request header "Hdr" list member "member"
# %>{Hdr:;member}
# HTTP request header list member using ; as
# list separator. ; can be any non-alphanumeric
# character.
#
# %<{Header} HTTP reply header "Header"
# %<{Hdr:member}
# HTTP reply header "Hdr" list member "member"
# %<{Hdr:;member}
# HTTP reply header list member using ; as
# list separator. ; can be any non-alphanumeric
# character.
#
# %ACL The name of the ACL being tested.
# %DATA The ACL arguments. If not used then any arguments
# is automatically added at the end of the line
# sent to the helper.
# NOTE: this will encode the arguments as one token,
# whereas the default will pass each separately.
#
# %% The percent sign. Useful for helpers which need
# an unchanging input format.
#
#
# General request syntax:
#
# [channel-ID] FORMAT-values [acl-values ...]
#
#
# FORMAT-values consists of transaction details expanded with
# whitespace separation per the config file FORMAT specification
# using the FORMAT macros listed above.
#
# acl-values consists of any string specified in the referencing
# config 'acl ... external' line. see the "acl external" directive.
#
# Request values sent to the helper are URL escaped to protect
# each value in requests against whitespaces.
#
# If using protocol=2.5 then the request sent to the helper is not
# URL escaped to protect against whitespace.
#
# NOTE: protocol=3.0 is deprecated as no longer necessary.
#
# When using the concurrency= option the protocol is changed by
# introducing a query channel tag in front of the request/response.
# The query channel tag is a number between 0 and concurrency-1.
# This value must be echoed back unchanged to Squid as the first part
# of the response relating to its request.
#
#
# The helper receives lines expanded per the above format specification
# and for each input line returns 1 line starting with OK/ERR/BH result
# code and optionally followed by additional keywords with more details.
#
#
# General result syntax:
#
# [channel-ID] result keyword=value ...
#
# Result consists of one of the codes:
#
# OK
# the ACL test produced a match.
#
# ERR
# the ACL test does not produce a match.
#
# BH
# An internal error occurred in the helper, preventing
# a result being identified.
#
# The meaning of 'a match' is determined by your squid.conf
# access control configuration. See the Squid wiki for details.
#
# Defined keywords:
#
# user= The users name (login)
#
# password= The users password (for login= cache_peer option)
#
# message= Message describing the reason for this response.
# Available as %o in error pages.
# Useful on (ERR and BH results).
#
# tag= Apply a tag to a request. Only sets a tag once,
# does not alter existing tags.
#
# log= String to be logged in access.log. Available as
# %ea in logformat specifications.
#
# clt_conn_tag= Associates a TAG with the client TCP connection.
# Please see url_rewrite_program related documentation
# for this kv-pair.
#
# Any keywords may be sent on any response whether OK, ERR or BH.
#
# All response keyword values need to be a single token with URL
# escaping, or enclosed in double quotes (") and escaped using \ on
# any double quotes or \ characters within the value. The wrapping
# double quotes are removed before the value is interpreted by Squid.
# \r and \n are also replace by CR and LF.
#
# Some example key values:
#
# user=John%20Smith
# user="John Smith"
# user="J. \"Bob\" Smith"
#Default:
# none
# TAG: acl
# Defining an Access List
#
# Every access list definition must begin with an aclname and acltype,
# followed by either type-specific arguments or a quoted filename that
# they are read from.
#
# acl aclname acltype argument ...
# acl aclname acltype "file" ...
#
# When using "file", the file should contain one item per line.
#
# Some acl types supports options which changes their default behaviour.
# The available options are:
#
# -i,+i By default, regular expressions are CASE-SENSITIVE. To make them
# case-insensitive, use the -i option. To return case-sensitive
# use the +i option between patterns, or make a new ACL line
# without -i.
#
# -n Disable lookups and address type conversions. If lookup or
# conversion is required because the parameter type (IP or
# domain name) does not match the message address type (domain
# name or IP), then the ACL would immediately declare a mismatch
# without any warnings or lookups.
#
# -- Used to stop processing all options, in the case the first acl
# value has '-' character as first character (for example the '-'
# is a valid domain name)
#
# Some acl types require suspending the current request in order
# to access some external data source.
# Those which do are marked with the tag [slow], those which
# don't are marked as [fast].
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl
# for further information
#
# ***** ACL TYPES AVAILABLE *****
#
# acl aclname src ip-address/mask ... # clients IP address [fast]
# acl aclname src addr1-addr2/mask ... # range of addresses [fast]
# acl aclname dst [-n] ip-address/mask ... # URL host's IP address [slow]
# acl aclname localip ip-address/mask ... # IP address the client connected to [fast]
#
# acl aclname arp mac-address ... (xx:xx:xx:xx:xx:xx notation)
# # [fast]
# # The 'arp' ACL code is not portable to all operating systems.
# # It works on Linux, Solaris, Windows, FreeBSD, and some other
# # BSD variants.
# #
# # NOTE: Squid can only determine the MAC/EUI address for IPv4
# # clients that are on the same subnet. If the client is on a
# # different subnet, then Squid cannot find out its address.
# #
# # NOTE 2: IPv6 protocol does not contain ARP. MAC/EUI is either
# # encoded directly in the IPv6 address or not available.
#
# acl aclname srcdomain .foo.com ...
# # reverse lookup, from client IP [slow]
# acl aclname dstdomain [-n] .foo.com ...
# # Destination server from URL [fast]
# acl aclname srcdom_regex [-i] \.foo\.com ...
# # regex matching client name [slow]
# acl aclname dstdom_regex [-n] [-i] \.foo\.com ...
# # regex matching server [fast]
# #
# # For dstdomain and dstdom_regex a reverse lookup is tried if a IP
# # based URL is used and no match is found. The name "none" is used
# # if the reverse lookup fails.
#
# acl aclname src_as number ...
# acl aclname dst_as number ...
# # [fast]
# # Except for access control, AS numbers can be used for
# # routing of requests to specific caches. Here's an
# # example for routing all requests for AS#1241 and only
# # those to mycache.mydomain.net:
# # acl asexample dst_as 1241
# # cache_peer_access mycache.mydomain.net allow asexample
# # cache_peer_access mycache_mydomain.net deny all
#
# acl aclname peername myPeer ...
# # [fast]
# # match against a named cache_peer entry
# # set unique name= on cache_peer lines for reliable use.
#
# acl aclname time [day-abbrevs] [h1:m1-h2:m2]
# # [fast]
# # day-abbrevs:
# # S - Sunday
# # M - Monday
# # T - Tuesday
# # W - Wednesday
# # H - Thursday
# # F - Friday
# # A - Saturday
# # h1:m1 must be less than h2:m2
#
# acl aclname url_regex [-i] ^http:// ...
# # regex matching on whole URL [fast]
# acl aclname urllogin [-i] [^a-zA-Z0-9] ...
# # regex matching on URL login field
# acl aclname urlpath_regex [-i] \.gif$ ...
# # regex matching on URL path [fast]
#
# acl aclname port 80 70 21 0-1024... # destination TCP port [fast]
# # ranges are alloed
# acl aclname localport 3128 ... # TCP port the client connected to [fast]
# # NP: for interception mode this is usually '80'
#
# acl aclname myportname 3128 ... # *_port name [fast]
#
# acl aclname proto HTTP FTP ... # request protocol [fast]
#
# acl aclname method GET POST ... # HTTP request method [fast]
#
# acl aclname http_status 200 301 500- 400-403 ...
# # status code in reply [fast]
#
# acl aclname browser [-i] regexp ...
# # pattern match on User-Agent header (see also req_header below) [fast]
#
# acl aclname referer_regex [-i] regexp ...
# # pattern match on Referer header [fast]
# # Referer is highly unreliable, so use with care
#
# acl aclname ident username ...
# acl aclname ident_regex [-i] pattern ...
# # string match on ident output [slow]
# # use REQUIRED to accept any non-null ident.
#
# acl aclname proxy_auth [-i] username ...
# acl aclname proxy_auth_regex [-i] pattern ...
# # perform http authentication challenge to the client and match against
# # supplied credentials [slow]
# #
# # takes a list of allowed usernames.
# # use REQUIRED to accept any valid username.
# #
# # Will use proxy authentication in forward-proxy scenarios, and plain
# # http authenticaiton in reverse-proxy scenarios
# #
# # NOTE: when a Proxy-Authentication header is sent but it is not
# # needed during ACL checking the username is NOT logged
# # in access.log.
# #
# # NOTE: proxy_auth requires a EXTERNAL authentication program
# # to check username/password combinations (see
# # auth_param directive).
# #
# # NOTE: proxy_auth can't be used in a transparent/intercepting proxy
# # as the browser needs to be configured for using a proxy in order
# # to respond to proxy authentication.
#
# acl aclname snmp_community string ...
# # A community string to limit access to your SNMP Agent [fast]
# # Example:
# #
# # acl snmppublic snmp_community public
#
# acl aclname maxconn number
# # This will be matched when the client's IP address has
# # more than <number> TCP connections established. [fast]
# # NOTE: This only measures direct TCP links so X-Forwarded-For
# # indirect clients are not counted.
#
# acl aclname max_user_ip [-s] number
# # This will be matched when the user attempts to log in from more
# # than <number> different ip addresses. The authenticate_ip_ttl
# # parameter controls the timeout on the ip entries. [fast]
# # If -s is specified the limit is strict, denying browsing
# # from any further IP addresses until the ttl has expired. Without
# # -s Squid will just annoy the user by "randomly" denying requests.
# # (the counter is reset each time the limit is reached and a
# # request is denied)
# # NOTE: in acceleration mode or where there is mesh of child proxies,
# # clients may appear to come from multiple addresses if they are
# # going through proxy farms, so a limit of 1 may cause user problems.
#
# acl aclname random probability
# # Pseudo-randomly match requests. Based on the probability given.
# # Probability may be written as a decimal (0.333), fraction (1/3)
# # or ratio of matches:non-matches (3:5).
#
# acl aclname req_mime_type [-i] mime-type ...
# # regex match against the mime type of the request generated
# # by the client. Can be used to detect file upload or some
# # types HTTP tunneling requests [fast]
# # NOTE: This does NOT match the reply. You cannot use this
# # to match the returned file type.
#
# acl aclname req_header header-name [-i] any\.regex\.here
# # regex match against any of the known request headers. May be
# # thought of as a superset of "browser", "referer" and "mime-type"
# # ACL [fast]
#
# acl aclname rep_mime_type [-i] mime-type ...
# # regex match against the mime type of the reply received by
# # squid. Can be used to detect file download or some
# # types HTTP tunneling requests. [fast]
# # NOTE: This has no effect in http_access rules. It only has
# # effect in rules that affect the reply data stream such as
# # http_reply_access.
#
# acl aclname rep_header header-name [-i] any\.regex\.here
# # regex match against any of the known reply headers. May be
# # thought of as a superset of "browser", "referer" and "mime-type"
# # ACLs [fast]
#
# acl aclname external class_name [arguments...]
# # external ACL lookup via a helper class defined by the
# # external_acl_type directive [slow]
#
# acl aclname user_cert attribute values...
# # match against attributes in a user SSL certificate
# # attribute is one of DN/C/O/CN/L/ST or a numerical OID [fast]
#
# acl aclname ca_cert attribute values...
# # match against attributes a users issuing CA SSL certificate
# # attribute is one of DN/C/O/CN/L/ST or a numerical OID [fast]
#
# acl aclname ext_user username ...
# acl aclname ext_user_regex [-i] pattern ...
# # string match on username returned by external acl helper [slow]
# # use REQUIRED to accept any non-null user name.
#
# acl aclname tag tagvalue ...
# # string match on tag returned by external acl helper [fast]
# # DEPRECATED. Only the first tag will match with this ACL.
# # Use the 'note' ACL instead for handling multiple tag values.
#
# acl aclname hier_code codename ...
# # string match against squid hierarchy code(s); [fast]
# # e.g., DIRECT, PARENT_HIT, NONE, etc.
# #
# # NOTE: This has no effect in http_access rules. It only has
# # effect in rules that affect the reply data stream such as
# # http_reply_access.
#
# acl aclname note name [value ...]
# # match transaction annotation [fast]
# # Without values, matches any annotation with a given name.
# # With value(s), matches any annotation with a given name that
# # also has one of the given values.
# # Names and values are compared using a string equality test.
# # Annotation sources include note and adaptation_meta directives
# # as well as helper and eCAP responses.
#
# acl aclname adaptation_service service ...
# # Matches the name of any icap_service, ecap_service,
# # adaptation_service_set, or adaptation_service_chain that Squid
# # has used (or attempted to use) for the master transaction.
# # This ACL must be defined after the corresponding adaptation
# # service is named in squid.conf. This ACL is usable with
# # adaptation_meta because it starts matching immediately after
# # the service has been selected for adaptation.
#
# acl aclname any-of acl1 acl2 ...
# # match any one of the acls [fast or slow]
# # The first matching ACL stops further ACL evaluation.
# #
# # ACLs from multiple any-of lines with the same name are ORed.
# # For example, A = (a1 or a2) or (a3 or a4) can be written as
# # acl A any-of a1 a2
# # acl A any-of a3 a4
# #
# # This group ACL is fast if all evaluated ACLs in the group are fast
# # and slow otherwise.
#
# acl aclname all-of acl1 acl2 ...
# # match all of the acls [fast or slow]
# # The first mismatching ACL stops further ACL evaluation.
# #
# # ACLs from multiple all-of lines with the same name are ORed.
# # For example, B = (b1 and b2) or (b3 and b4) can be written as
# # acl B all-of b1 b2
# # acl B all-of b3 b4
# #
# # This group ACL is fast if all evaluated ACLs in the group are fast
# # and slow otherwise.
#
# Examples:
# acl macaddress arp 09:00:2b:23:45:67
# acl myexample dst_as 1241
# acl password proxy_auth REQUIRED
# acl fileupload req_mime_type -i ^multipart/form-data$
# acl javascript rep_mime_type -i ^application/x-javascript$
#
#Default:
# ACLs all, manager, localhost, and to_localhost are predefined.
#
#
# Recommended minimum configuration:
#
# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
#acl localnet src 10.0.0.0/8 # RFC1918 possible internal network
#acl localnet src 172.16.0.0/12 # RFC1918 possible internal network
#acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
#acl localnet src fc00::/7 # RFC 4193 local private network range
#acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT
# TAG: proxy_protocol_access
# Determine which client proxies can be trusted to provide correct
# information regarding real client IP address using PROXY protocol.
#
# Requests may pass through a chain of several other proxies
# before reaching us. The original source details may by sent in:
# * HTTP message Forwarded header, or
# * HTTP message X-Forwarded-For header, or
# * PROXY protocol connection header.
#
# This directive is solely for validating new PROXY protocol
# connections received from a port flagged with require-proxy-header.
# It is checked only once after TCP connection setup.
#
# A deny match results in TCP connection closure.
#
# An allow match is required for Squid to permit the corresponding
# TCP connection, before Squid even looks for HTTP request headers.
# If there is an allow match, Squid starts using PROXY header information
# to determine the source address of the connection for all future ACL
# checks, logging, etc.
#
# SECURITY CONSIDERATIONS:
#
# Any host from which we accept client IP details can place
# incorrect information in the relevant header, and Squid
# will use the incorrect information as if it were the
# source address of the request. This may enable remote
# hosts to bypass any access control restrictions that are
# based on the client's source addresses.
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# all TCP connections to ports with require-proxy-header will be denied
# TAG: follow_x_forwarded_for
# Determine which client proxies can be trusted to provide correct
# information regarding real client IP address.
#
# Requests may pass through a chain of several other proxies
# before reaching us. The original source details may by sent in:
# * HTTP message Forwarded header, or
# * HTTP message X-Forwarded-For header, or
# * PROXY protocol connection header.
#
# PROXY protocol connections are controlled by the proxy_protocol_access
# directive which is checked before this.
#
# If a request reaches us from a source that is allowed by this
# directive, then we trust the information it provides regarding
# the IP of the client it received from (if any).
#
# For the purpose of ACLs used in this directive the src ACL type always
# matches the address we are testing and srcdomain matches its rDNS.
#
# On each HTTP request Squid checks for X-Forwarded-For header fields.
# If found the header values are iterated in reverse order and an allow
# match is required for Squid to continue on to the next value.
# The verification ends when a value receives a deny match, cannot be
# tested, or there are no more values to test.
# NOTE: Squid does not yet follow the Forwarded HTTP header.
#
# The end result of this process is an IP address that we will
# refer to as the indirect client address. This address may
# be treated as the client address for access control, ICAP, delay
# pools and logging, depending on the acl_uses_indirect_client,
# icap_uses_indirect_client, delay_pool_uses_indirect_client,
# log_uses_indirect_client and tproxy_uses_indirect_client options.
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
# SECURITY CONSIDERATIONS:
#
# Any host from which we accept client IP details can place
# incorrect information in the relevant header, and Squid
# will use the incorrect information as if it were the
# source address of the request. This may enable remote
# hosts to bypass any access control restrictions that are
# based on the client's source addresses.
#
# For example:
#
# acl localhost src 127.0.0.1
# acl my_other_proxy srcdomain .proxy.example.com
# follow_x_forwarded_for allow localhost
# follow_x_forwarded_for allow my_other_proxy
#Default:
# X-Forwarded-For header will be ignored.
# TAG: acl_uses_indirect_client on|off
# Controls whether the indirect client address
# (see follow_x_forwarded_for) is used instead of the
# direct client address in acl matching.
#
# NOTE: maxconn ACL considers direct TCP links and indirect
# clients will always have zero. So no match.
#Default:
# acl_uses_indirect_client on
# TAG: delay_pool_uses_indirect_client on|off
# Controls whether the indirect client address
# (see follow_x_forwarded_for) is used instead of the
# direct client address in delay pools.
#Default:
# delay_pool_uses_indirect_client on
# TAG: log_uses_indirect_client on|off
# Controls whether the indirect client address
# (see follow_x_forwarded_for) is used instead of the
# direct client address in the access log.
#Default:
# log_uses_indirect_client on
# TAG: tproxy_uses_indirect_client on|off
# Controls whether the indirect client address
# (see follow_x_forwarded_for) is used instead of the
# direct client address when spoofing the outgoing client.
#
# This has no effect on requests arriving in non-tproxy
# mode ports.
#
# SECURITY WARNING: Usage of this option is dangerous
# and should not be used trivially. Correct configuration
# of follow_x_forwarded_for with a limited set of trusted
# sources is required to prevent abuse of your proxy.
#Default:
# tproxy_uses_indirect_client off
# TAG: spoof_client_ip
# Control client IP address spoofing of TPROXY traffic based on
# defined access lists.
#
# spoof_client_ip allow|deny [!]aclname ...
#
# If there are no "spoof_client_ip" lines present, the default
# is to "allow" spoofing of any suitable request.
#
# Note that the cache_peer "no-tproxy" option overrides this ACL.
#
# This clause supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# Allow spoofing on all TPROXY traffic.
# TAG: http_access
# Allowing or Denying access based on defined access lists
#
# To allow or deny a message received on an HTTP, HTTPS, or FTP port:
# http_access allow|deny [!]aclname ...
#
# NOTE on default values:
#
# If there are no "access" lines present, the default is to deny
# the request.
#
# If none of the "access" lines cause a match, the default is the
# opposite of the last line in the list. If the last line was
# deny, the default is allow. Conversely, if the last line
# is allow, the default will be deny. For these reasons, it is a
# good idea to have an "deny all" entry at the end of your access
# lists to avoid potential confusion.
#
# This clause supports both fast and slow acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
#Default:
# Deny, unless rules exist in squid.conf.
#
#
# Recommended minimum Access Permission configuration:
#
# Deny requests to certain unsafe ports
http_access deny !Safe_ports
# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports
# Only allow cachemgr access from localhost
http_access allow localhost manager
http_access deny manager
# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost
#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#
# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
#http_access allow localnet
http_access allow localhost
# And finally deny all other access to this proxy
http_access deny all
# TAG: adapted_http_access
# Allowing or Denying access based on defined access lists
#
# Essentially identical to http_access, but runs after redirectors
# and ICAP/eCAP adaptation. Allowing access control based on their
# output.
#
# If not set then only http_access is used.
#Default:
# Allow, unless rules exist in squid.conf.
# TAG: http_reply_access
# Allow replies to client requests. This is complementary to http_access.
#
# http_reply_access allow|deny [!] aclname ...
#
# NOTE: if there are no access lines present, the default is to allow
# all replies.
#
# If none of the access lines cause a match the opposite of the
# last line will apply. Thus it is good practice to end the rules
# with an "allow all" or "deny all" entry.
#
# This clause supports both fast and slow acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# Allow, unless rules exist in squid.conf.
# TAG: icp_access
# Allowing or Denying access to the ICP port based on defined
# access lists
#
# icp_access allow|deny [!]aclname ...
#
# NOTE: The default if no icp_access lines are present is to
# deny all traffic. This default may cause problems with peers
# using ICP.
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
## Allow ICP queries from local networks only
##icp_access allow localnet
##icp_access deny all
#Default:
# Deny, unless rules exist in squid.conf.
# TAG: htcp_access
# Allowing or Denying access to the HTCP port based on defined
# access lists
#
# htcp_access allow|deny [!]aclname ...
#
# See also htcp_clr_access for details on access control for
# cache purge (CLR) HTCP messages.
#
# NOTE: The default if no htcp_access lines are present is to
# deny all traffic. This default may cause problems with peers
# using the htcp option.
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
## Allow HTCP queries from local networks only
##htcp_access allow localnet
##htcp_access deny all
#Default:
# Deny, unless rules exist in squid.conf.
# TAG: htcp_clr_access
# Allowing or Denying access to purge content using HTCP based
# on defined access lists.
# See htcp_access for details on general HTCP access control.
#
# htcp_clr_access allow|deny [!]aclname ...
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
## Allow HTCP CLR requests from trusted peers
#acl htcp_clr_peer src 192.0.2.2 2001:DB8::2
#htcp_clr_access allow htcp_clr_peer
#htcp_clr_access deny all
#Default:
# Deny, unless rules exist in squid.conf.
# TAG: miss_access
# Determines whether network access is permitted when satisfying a request.
#
# For example;
# to force your neighbors to use you as a sibling instead of
# a parent.
#
# acl localclients src 192.0.2.0/24 2001:DB8::a:0/64
# miss_access deny !localclients
# miss_access allow all
#
# This means only your local clients are allowed to fetch relayed/MISS
# replies from the network and all other clients can only fetch cached
# objects (HITs).
#
# The default for this setting allows all clients who passed the
# http_access rules to relay via this proxy.
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# Allow, unless rules exist in squid.conf.
# TAG: ident_lookup_access
# A list of ACL elements which, if matched, cause an ident
# (RFC 931) lookup to be performed for this request. For
# example, you might choose to always perform ident lookups
# for your main multi-user Unix boxes, but not for your Macs
# and PCs. By default, ident lookups are not performed for
# any requests.
#
# To enable ident lookups for specific client addresses, you
# can follow this example:
#
# acl ident_aware_hosts src 198.168.1.0/24
# ident_lookup_access allow ident_aware_hosts
# ident_lookup_access deny all
#
# Only src type ACL checks are fully supported. A srcdomain
# ACL might work at times, but it will not always provide
# the correct result.
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# Unless rules exist in squid.conf, IDENT is not fetched.
# TAG: reply_body_max_size size [acl acl...]
# This option specifies the maximum size of a reply body. It can be
# used to prevent users from downloading very large files, such as
# MP3's and movies. When the reply headers are received, the
# reply_body_max_size lines are processed, and the first line where
# all (if any) listed ACLs are true is used as the maximum body size
# for this reply.
#
# This size is checked twice. First when we get the reply headers,
# we check the content-length value. If the content length value exists
# and is larger than the allowed size, the request is denied and the
# user receives an error message that says "the request or reply
# is too large." If there is no content-length, and the reply
# size exceeds this limit, the client's connection is just closed
# and they will receive a partial reply.
#
# WARNING: downstream caches probably can not detect a partial reply
# if there is no content-length header, so they will cache
# partial responses and give them out as hits. You should NOT
# use this option if you have downstream caches.
#
# WARNING: A maximum size smaller than the size of squid's error messages
# will cause an infinite loop and crash squid. Ensure that the smallest
# non-zero value you use is greater that the maximum header size plus
# the size of your largest error page.
#
# If you set this parameter none (the default), there will be
# no limit imposed.
#
# Configuration Format is:
# reply_body_max_size SIZE UNITS [acl ...]
# ie.
# reply_body_max_size 10 MB
#
#Default:
# No limit is applied.
# NETWORK OPTIONS
# -----------------------------------------------------------------------------
# TAG: http_port
# Usage: port [mode] [options]
# hostname:port [mode] [options]
# 1.2.3.4:port [mode] [options]
#
# The socket addresses where Squid will listen for HTTP client
# requests. You may specify multiple socket addresses.
# There are three forms: port alone, hostname with port, and
# IP address with port. If you specify a hostname or IP
# address, Squid binds the socket to that specific
# address. Most likely, you do not need to bind to a specific
# address, so you can use the port number alone.
#
# If you are running Squid in accelerator mode, you
# probably want to listen on port 80 also, or instead.
#
# The -a command line option may be used to specify additional
# port(s) where Squid listens for proxy request. Such ports will
# be plain proxy ports with no options.
#
# You may specify multiple socket addresses on multiple lines.
#
# Modes:
#
# intercept Support for IP-Layer NAT interception delivering
# traffic to this Squid port.
# NP: disables authentication on the port.
#
# tproxy Support Linux TPROXY (or BSD divert-to) with spoofing
# of outgoing connections using the client IP address.
# NP: disables authentication on the port.
#
# accel Accelerator / reverse proxy mode
#
# ssl-bump For each CONNECT request allowed by ssl_bump ACLs,
# establish secure connection with the client and with
# the server, decrypt HTTPS messages as they pass through
# Squid, and treat them as unencrypted HTTP messages,
# becoming the man-in-the-middle.
#
# The ssl_bump option is required to fully enable
# bumping of CONNECT requests.
#
# Omitting the mode flag causes default forward proxy mode to be used.
#
#
# Accelerator Mode Options:
#
# defaultsite=domainname
# What to use for the Host: header if it is not present
# in a request. Determines what site (not origin server)
# accelerators should consider the default.
#
# no-vhost Disable using HTTP/1.1 Host header for virtual domain support.
#
# protocol= Protocol to reconstruct accelerated and intercepted
# requests with. Defaults to HTTP/1.1 for http_port and
# HTTPS/1.1 for https_port.
# When an unsupported value is configured Squid will
# produce a FATAL error.
# Values: HTTP or HTTP/1.1, HTTPS or HTTPS/1.1
#
# vport Virtual host port support. Using the http_port number
# instead of the port passed on Host: headers.
#
# vport=NN Virtual host port support. Using the specified port
# number instead of the port passed on Host: headers.
#
# act-as-origin
# Act as if this Squid is the origin server.
# This currently means generate new Date: and Expires:
# headers on HIT instead of adding Age:.
#
# ignore-cc Ignore request Cache-Control headers.
#
# WARNING: This option violates HTTP specifications if
# used in non-accelerator setups.
#
# allow-direct Allow direct forwarding in accelerator mode. Normally
# accelerated requests are denied direct forwarding as if
# never_direct was used.
#
# WARNING: this option opens accelerator mode to security
# vulnerabilities usually only affecting in interception
# mode. Make sure to protect forwarding with suitable
# http_access rules when using this.
#
#
# SSL Bump Mode Options:
# In addition to these options ssl-bump requires TLS/SSL options.
#
# generate-host-certificates[=<on|off>]
# Dynamically create SSL server certificates for the
# destination hosts of bumped CONNECT requests.When
# enabled, the cert and key options are used to sign
# generated certificates. Otherwise generated
# certificate will be selfsigned.
# If there is a CA certificate lifetime of the generated
# certificate equals lifetime of the CA certificate. If
# generated certificate is selfsigned lifetime is three
# years.
# This option is enabled by default when ssl-bump is used.
# See the ssl-bump option above for more information.
#
# dynamic_cert_mem_cache_size=SIZE
# Approximate total RAM size spent on cached generated
# certificates. If set to zero, caching is disabled. The
# default value is 4MB.
#
# TLS / SSL Options:
#
# cert= Path to SSL certificate (PEM format).
#
# key= Path to SSL private key file (PEM format)
# if not specified, the certificate file is
# assumed to be a combined certificate and
# key file.
#
# version= The version of SSL/TLS supported
# 1 automatic (default)
# 2 SSLv2 only
# 3 SSLv3 only
# 4 TLSv1.0 only
# 5 TLSv1.1 only
# 6 TLSv1.2 only
#
# cipher= Colon separated list of supported ciphers.
# NOTE: some ciphers such as EDH ciphers depend on
# additional settings. If those settings are
# omitted the ciphers may be silently ignored
# by the OpenSSL library.
#
# options= Various SSL implementation options. The most important
# being:
# NO_SSLv2 Disallow the use of SSLv2
# NO_SSLv3 Disallow the use of SSLv3
# NO_TLSv1 Disallow the use of TLSv1.0
# NO_TLSv1_1 Disallow the use of TLSv1.1
# NO_TLSv1_2 Disallow the use of TLSv1.2
# SINGLE_DH_USE Always create a new key when using
# temporary/ephemeral DH key exchanges
# NO_TICKET Disables TLS tickets extension
# ALL Enable various bug workarounds
# suggested as "harmless" by OpenSSL
# Be warned that this reduces SSL/TLS
# strength to some attacks.
# See OpenSSL SSL_CTX_set_options documentation for a
# complete list of options.
#
# clientca= File containing the list of CAs to use when
# requesting a client certificate.
#
# cafile= File containing additional CA certificates to
# use when verifying client certificates. If unset
# clientca will be used.
#
# capath= Directory containing additional CA certificates
# and CRL lists to use when verifying client certificates.
#
# crlfile= File of additional CRL lists to use when verifying
# the client certificate, in addition to CRLs stored in
# the capath. Implies VERIFY_CRL flag below.
#
# dhparams= File containing DH parameters for temporary/ephemeral
# DH key exchanges. See OpenSSL documentation for details
# on how to create this file.
# WARNING: EDH ciphers will be silently disabled if this
# option is not set.
#
# sslflags= Various flags modifying the use of SSL:
# DELAYED_AUTH
# Don't request client certificates
# immediately, but wait until acl processing
# requires a certificate (not yet implemented).
# NO_DEFAULT_CA
# Don't use the default CA lists built in
# to OpenSSL.
# NO_SESSION_REUSE
# Don't allow for session reuse. Each connection
# will result in a new SSL session.
# VERIFY_CRL
# Verify CRL lists when accepting client
# certificates.
# VERIFY_CRL_ALL
# Verify CRL lists for all certificates in the
# client certificate chain.
#
# sslcontext= SSL session ID context identifier.
#
# Other Options:
#
# connection-auth[=on|off]
# use connection-auth=off to tell Squid to prevent
# forwarding Microsoft connection oriented authentication
# (NTLM, Negotiate and Kerberos)
#
# disable-pmtu-discovery=
# Control Path-MTU discovery usage:
# off lets OS decide on what to do (default).
# transparent disable PMTU discovery when transparent
# support is enabled.
# always disable always PMTU discovery.
#
# In many setups of transparently intercepting proxies
# Path-MTU discovery can not work on traffic towards the
# clients. This is the case when the intercepting device
# does not fully track connections and fails to forward
# ICMP must fragment messages to the cache server. If you
# have such setup and experience that certain clients
# sporadically hang or never complete requests set
# disable-pmtu-discovery option to 'transparent'.
#
# name= Specifies a internal name for the port. Defaults to
# the port specification (port or addr:port)
#
# tcpkeepalive[=idle,interval,timeout]
# Enable TCP keepalive probes of idle connections.
# In seconds; idle is the initial time before TCP starts
# probing the connection, interval how often to probe, and
# timeout the time before giving up.
#
# require-proxy-header
# Require PROXY protocol version 1 or 2 connections.
# The proxy_protocol_access is required to whitelist
# downstream proxies which can be trusted.
#
# If you run Squid on a dual-homed machine with an internal
# and an external interface we recommend you to specify the
# internal address:port in http_port. This way Squid will only be
# visible on the internal address.
#
#
# Squid normally listens to port 3128
http_port 3128
# TAG: https_port
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Usage: [ip:]port cert=certificate.pem [key=key.pem] [mode] [options...]
#
# The socket address where Squid will listen for client requests made
# over TLS or SSL connections. Commonly referred to as HTTPS.
#
# This is most useful for situations where you are running squid in
# accelerator mode and you want to do the SSL work at the accelerator level.
#
# You may specify multiple socket addresses on multiple lines,
# each with their own SSL certificate and/or options.
#
# Modes:
#
# accel Accelerator / reverse proxy mode
#
# intercept Support for IP-Layer interception of
# outgoing requests without browser settings.
# NP: disables authentication and IPv6 on the port.
#
# tproxy Support Linux TPROXY for spoofing outgoing
# connections using the client IP address.
# NP: disables authentication and maybe IPv6 on the port.
#
# ssl-bump For each intercepted connection allowed by ssl_bump
# ACLs, establish a secure connection with the client and with
# the server, decrypt HTTPS messages as they pass through
# Squid, and treat them as unencrypted HTTP messages,
# becoming the man-in-the-middle.
#
# An "ssl_bump server-first" match is required to
# fully enable bumping of intercepted SSL connections.
#
# Requires tproxy or intercept.
#
# Omitting the mode flag causes default forward proxy mode to be used.
#
#
# See http_port for a list of generic options
#
#
# SSL Options:
#
# cert= Path to SSL certificate (PEM format).
#
# key= Path to SSL private key file (PEM format)
# if not specified, the certificate file is
# assumed to be a combined certificate and
# key file.
#
# version= The version of SSL/TLS supported
# 1 automatic (default)
# 2 SSLv2 only
# 3 SSLv3 only
# 4 TLSv1 only
#
# cipher= Colon separated list of supported ciphers.
#
# options= Various SSL engine options. The most important
# being:
# NO_SSLv2 Disallow the use of SSLv2
# NO_SSLv3 Disallow the use of SSLv3
# NO_TLSv1 Disallow the use of TLSv1
# SINGLE_DH_USE Always create a new key when using
# temporary/ephemeral DH key exchanges
# See src/ssl_support.c or OpenSSL SSL_CTX_set_options
# documentation for a complete list of options.
#
# clientca= File containing the list of CAs to use when
# requesting a client certificate.
#
# cafile= File containing additional CA certificates to
# use when verifying client certificates. If unset
# clientca will be used.
#
# capath= Directory containing additional CA certificates
# and CRL lists to use when verifying client certificates.
#
# crlfile= File of additional CRL lists to use when verifying
# the client certificate, in addition to CRLs stored in
# the capath. Implies VERIFY_CRL flag below.
#
# dhparams= File containing DH parameters for temporary/ephemeral
# DH key exchanges.
#
# sslflags= Various flags modifying the use of SSL:
# DELAYED_AUTH
# Don't request client certificates
# immediately, but wait until acl processing
# requires a certificate (not yet implemented).
# NO_DEFAULT_CA
# Don't use the default CA lists built in
# to OpenSSL.
# NO_SESSION_REUSE
# Don't allow for session reuse. Each connection
# will result in a new SSL session.
# VERIFY_CRL
# Verify CRL lists when accepting client
# certificates.
# VERIFY_CRL_ALL
# Verify CRL lists for all certificates in the
# client certificate chain.
#
# sslcontext= SSL session ID context identifier.
#
# generate-host-certificates[=<on|off>]
# Dynamically create SSL server certificates for the
# destination hosts of bumped SSL requests.When
# enabled, the cert and key options are used to sign
# generated certificates. Otherwise generated
# certificate will be selfsigned.
# If there is CA certificate life time of generated
# certificate equals lifetime of CA certificate. If
# generated certificate is selfsigned lifetime is three
# years.
# This option is enabled by default when SslBump is used.
# See the sslBump option above for more information.
#
# dynamic_cert_mem_cache_size=SIZE
# Approximate total RAM size spent on cached generated
# certificates. If set to zero, caching is disabled. The
# default value is 4MB.
#
# See http_port for a list of available options.
#Default:
# none
# TAG: ftp_port
# Enables Native FTP proxy by specifying the socket address where Squid
# listens for FTP client requests. See http_port directive for various
# ways to specify the listening address and mode.
#
# Usage: ftp_port address [mode] [options]
#
# WARNING: This is a new, experimental, complex feature that has seen
# limited production exposure. Some Squid modules (e.g., caching) do not
# currently work with native FTP proxying, and many features have not
# even been tested for compatibility. Test well before deploying!
#
# Native FTP proxying differs substantially from proxying HTTP requests
# with ftp:// URIs because Squid works as an FTP server and receives
# actual FTP commands (rather than HTTP requests with FTP URLs).
#
# Native FTP commands accepted at ftp_port are internally converted or
# wrapped into HTTP-like messages. The same happens to Native FTP
# responses received from FTP origin servers. Those HTTP-like messages
# are shoveled through regular access control and adaptation layers
# between the FTP client and the FTP origin server. This allows Squid to
# examine, adapt, block, and log FTP exchanges. Squid reuses most HTTP
# mechanisms when shoveling wrapped FTP messages. For example,
# http_access and adaptation_access directives are used.
#
# Modes:
#
# intercept Same as http_port intercept. The FTP origin address is
# determined based on the intended destination of the
# intercepted connection.
#
# tproxy Support Linux TPROXY for spoofing outgoing
# connections using the client IP address.
# NP: disables authentication and maybe IPv6 on the port.
#
# By default (i.e., without an explicit mode option), Squid extracts the
# FTP origin address from the login@origin parameter of the FTP USER
# command. Many popular FTP clients support such native FTP proxying.
#
# Options:
#
# name=token Specifies an internal name for the port. Defaults to
# the port address. Usable with myportname ACL.
#
# ftp-track-dirs
# Enables tracking of FTP directories by injecting extra
# PWD commands and adjusting Request-URI (in wrapping
# HTTP requests) to reflect the current FTP server
# directory. Tracking is disabled by default.
#
# protocol=FTP Protocol to reconstruct accelerated and intercepted
# requests with. Defaults to FTP. No other accepted
# values have been tested with. An unsupported value
# results in a FATAL error. Accepted values are FTP,
# HTTP (or HTTP/1.1), and HTTPS (or HTTPS/1.1).
#
# Other http_port modes and options that are not specific to HTTP and
# HTTPS may also work.
#Default:
# none
# TAG: tcp_outgoing_tos
# Allows you to select a TOS/Diffserv value for packets outgoing
# on the server side, based on an ACL.
#
# tcp_outgoing_tos ds-field [!]aclname ...
#
# Example where normal_service_net uses the TOS value 0x00
# and good_service_net uses 0x20
#
# acl normal_service_net src 10.0.0.0/24
# acl good_service_net src 10.0.1.0/24
# tcp_outgoing_tos 0x00 normal_service_net
# tcp_outgoing_tos 0x20 good_service_net
#
# TOS/DSCP values really only have local significance - so you should
# know what you're specifying. For more information, see RFC2474,
# RFC2475, and RFC3260.
#
# The TOS/DSCP byte must be exactly that - a octet value 0 - 255, or
# "default" to use whatever default your host has.
# Note that only multiples of 4 are usable as the two rightmost bits have
# been redefined for use by ECN (RFC 3168 section 23.1).
# The squid parser will enforce this by masking away the ECN bits.
#
# Processing proceeds in the order specified, and stops at first fully
# matching line.
#
# Only fast ACLs are supported.
#Default:
# none
# TAG: clientside_tos
# Allows you to select a TOS/DSCP value for packets being transmitted
# on the client-side, based on an ACL.
#
# clientside_tos ds-field [!]aclname ...
#
# Example where normal_service_net uses the TOS value 0x00
# and good_service_net uses 0x20
#
# acl normal_service_net src 10.0.0.0/24
# acl good_service_net src 10.0.1.0/24
# clientside_tos 0x00 normal_service_net
# clientside_tos 0x20 good_service_net
#
# Note: This feature is incompatible with qos_flows. Any TOS values set here
# will be overwritten by TOS values in qos_flows.
#
# The TOS/DSCP byte must be exactly that - a octet value 0 - 255, or
# "default" to use whatever default your host has.
# Note that only multiples of 4 are usable as the two rightmost bits have
# been redefined for use by ECN (RFC 3168 section 23.1).
# The squid parser will enforce this by masking away the ECN bits.
#
#Default:
# none
# TAG: tcp_outgoing_mark
# Note: This option is only available if Squid is rebuilt with the
# Packet MARK (Linux)
#
# Allows you to apply a Netfilter mark value to outgoing packets
# on the server side, based on an ACL.
#
# tcp_outgoing_mark mark-value [!]aclname ...
#
# Example where normal_service_net uses the mark value 0x00
# and good_service_net uses 0x20
#
# acl normal_service_net src 10.0.0.0/24
# acl good_service_net src 10.0.1.0/24
# tcp_outgoing_mark 0x00 normal_service_net
# tcp_outgoing_mark 0x20 good_service_net
#
# Only fast ACLs are supported.
#Default:
# none
# TAG: clientside_mark
# Note: This option is only available if Squid is rebuilt with the
# Packet MARK (Linux)
#
# Allows you to apply a Netfilter mark value to packets being transmitted
# on the client-side, based on an ACL.
#
# clientside_mark mark-value [!]aclname ...
#
# Example where normal_service_net uses the mark value 0x00
# and good_service_net uses 0x20
#
# acl normal_service_net src 10.0.0.0/24
# acl good_service_net src 10.0.1.0/24
# clientside_mark 0x00 normal_service_net
# clientside_mark 0x20 good_service_net
#
# Note: This feature is incompatible with qos_flows. Any mark values set here
# will be overwritten by mark values in qos_flows.
#Default:
# none
# TAG: qos_flows
# Allows you to select a TOS/DSCP value to mark outgoing
# connections to the client, based on where the reply was sourced.
# For platforms using netfilter, allows you to set a netfilter mark
# value instead of, or in addition to, a TOS value.
#
# By default this functionality is disabled. To enable it with the default
# settings simply use "qos_flows mark" or "qos_flows tos". Default
# settings will result in the netfilter mark or TOS value being copied
# from the upstream connection to the client. Note that it is the connection
# CONNMARK value not the packet MARK value that is copied.
#
# It is not currently possible to copy the mark or TOS value from the
# client to the upstream connection request.
#
# TOS values really only have local significance - so you should
# know what you're specifying. For more information, see RFC2474,
# RFC2475, and RFC3260.
#
# The TOS/DSCP byte must be exactly that - a octet value 0 - 255.
# Note that only multiples of 4 are usable as the two rightmost bits have
# been redefined for use by ECN (RFC 3168 section 23.1).
# The squid parser will enforce this by masking away the ECN bits.
#
# Mark values can be any unsigned 32-bit integer value.
#
# This setting is configured by setting the following values:
#
# tos|mark Whether to set TOS or netfilter mark values
#
# local-hit=0xFF Value to mark local cache hits.
#
# sibling-hit=0xFF Value to mark hits from sibling peers.
#
# parent-hit=0xFF Value to mark hits from parent peers.
#
# miss=0xFF[/mask] Value to mark cache misses. Takes precedence
# over the preserve-miss feature (see below), unless
# mask is specified, in which case only the bits
# specified in the mask are written.
#
# The TOS variant of the following features are only possible on Linux
# and require your kernel to be patched with the TOS preserving ZPH
# patch, available from http://zph.bratcheda.org
# No patch is needed to preserve the netfilter mark, which will work
# with all variants of netfilter.
#
# disable-preserve-miss
# This option disables the preservation of the TOS or netfilter
# mark. By default, the existing TOS or netfilter mark value of
# the response coming from the remote server will be retained
# and masked with miss-mark.
# NOTE: in the case of a netfilter mark, the mark must be set on
# the connection (using the CONNMARK target) not on the packet
# (MARK target).
#
# miss-mask=0xFF
# Allows you to mask certain bits in the TOS or mark value
# received from the remote server, before copying the value to
# the TOS sent towards clients.
# Default for tos: 0xFF (TOS from server is not changed).
# Default for mark: 0xFFFFFFFF (mark from server is not changed).
#
# All of these features require the --enable-zph-qos compilation flag
# (enabled by default). Netfilter marking also requires the
# libnetfilter_conntrack libraries (--with-netfilter-conntrack) and
# libcap 2.09+ (--with-libcap).
#
#Default:
# none
# TAG: tcp_outgoing_address
# Allows you to map requests to different outgoing IP addresses
# based on the username or source address of the user making
# the request.
#
# tcp_outgoing_address ipaddr [[!]aclname] ...
#
# For example;
# Forwarding clients with dedicated IPs for certain subnets.
#
# acl normal_service_net src 10.0.0.0/24
# acl good_service_net src 10.0.2.0/24
#
# tcp_outgoing_address 2001:db8::c001 good_service_net
# tcp_outgoing_address 10.1.0.2 good_service_net
#
# tcp_outgoing_address 2001:db8::beef normal_service_net
# tcp_outgoing_address 10.1.0.1 normal_service_net
#
# tcp_outgoing_address 2001:db8::1
# tcp_outgoing_address 10.1.0.3
#
# Processing proceeds in the order specified, and stops at first fully
# matching line.
#
# Squid will add an implicit IP version test to each line.
# Requests going to IPv4 websites will use the outgoing 10.1.0.* addresses.
# Requests going to IPv6 websites will use the outgoing 2001:db8:* addresses.
#
#
# NOTE: The use of this directive using client dependent ACLs is
# incompatible with the use of server side persistent connections. To
# ensure correct results it is best to set server_persistent_connections
# to off when using this directive in such configurations.
#
# NOTE: The use of this directive to set a local IP on outgoing TCP links
# is incompatible with using TPROXY to set client IP out outbound TCP links.
# When needing to contact peers use the no-tproxy cache_peer option and the
# client_dst_passthru directive re-enable normal forwarding such as this.
#
#Default:
# Address selection is performed by the operating system.
# TAG: host_verify_strict
# Regardless of this option setting, when dealing with intercepted
# traffic, Squid always verifies that the destination IP address matches
# the Host header domain or IP (called 'authority form URL').
#
# This enforcement is performed to satisfy a MUST-level requirement in
# RFC 2616 section 14.23: "The Host field value MUST represent the naming
# authority of the origin server or gateway given by the original URL".
#
# When set to ON:
# Squid always responds with an HTTP 409 (Conflict) error
# page and logs a security warning if there is no match.
#
# Squid verifies that the destination IP address matches
# the Host header for forward-proxy and reverse-proxy traffic
# as well. For those traffic types, Squid also enables the
# following checks, comparing the corresponding Host header
# and Request-URI components:
#
# * The host names (domain or IP) must be identical,
# but valueless or missing Host header disables all checks.
# For the two host names to match, both must be either IP
# or FQDN.
#
# * Port numbers must be identical, but if a port is missing
# the scheme-default port is assumed.
#
#
# When set to OFF (the default):
# Squid allows suspicious requests to continue but logs a
# security warning and blocks caching of the response.
#
# * Forward-proxy traffic is not checked at all.
#
# * Reverse-proxy traffic is not checked at all.
#
# * Intercepted traffic which passes verification is handled
# according to client_dst_passthru.
#
# * Intercepted requests which fail verification are sent
# to the client original destination instead of DIRECT.
# This overrides 'client_dst_passthru off'.
#
# For now suspicious intercepted CONNECT requests are always
# responded to with an HTTP 409 (Conflict) error page.
#
#
# SECURITY NOTE:
#
# As described in CVE-2009-0801 when the Host: header alone is used
# to determine the destination of a request it becomes trivial for
# malicious scripts on remote websites to bypass browser same-origin
# security policy and sandboxing protections.
#
# The cause of this is that such applets are allowed to perform their
# own HTTP stack, in which case the same-origin policy of the browser
# sandbox only verifies that the applet tries to contact the same IP
# as from where it was loaded at the IP level. The Host: header may
# be different from the connected IP and approved origin.
#
#Default:
# host_verify_strict off
# TAG: client_dst_passthru
# With NAT or TPROXY intercepted traffic Squid may pass the request
# directly to the original client destination IP or seek a faster
# source using the HTTP Host header.
#
# Using Host to locate alternative servers can provide faster
# connectivity with a range of failure recovery options.
# But can also lead to connectivity trouble when the client and
# server are attempting stateful interactions unaware of the proxy.
#
# This option (on by default) prevents alternative DNS entries being
# located to send intercepted traffic DIRECT to an origin server.
# The clients original destination IP and port will be used instead.
#
# Regardless of this option setting, when dealing with intercepted
# traffic Squid will verify the Host: header and any traffic which
# fails Host verification will be treated as if this option were ON.
#
# see host_verify_strict for details on the verification process.
#Default:
# client_dst_passthru on
# SSL OPTIONS
# -----------------------------------------------------------------------------
# TAG: ssl_unclean_shutdown
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Some browsers (especially MSIE) bugs out on SSL shutdown
# messages.
#Default:
# ssl_unclean_shutdown off
# TAG: ssl_engine
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# The OpenSSL engine to use. You will need to set this if you
# would like to use hardware SSL acceleration for example.
#Default:
# none
# TAG: sslproxy_client_certificate
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Client SSL Certificate to use when proxying https:// URLs
#Default:
# none
# TAG: sslproxy_client_key
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Client SSL Key to use when proxying https:// URLs
#Default:
# none
# TAG: sslproxy_version
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# SSL version level to use when proxying https:// URLs
#
# The versions of SSL/TLS supported:
#
# 1 automatic (default)
# 2 SSLv2 only
# 3 SSLv3 only
# 4 TLSv1.0 only
# 5 TLSv1.1 only
# 6 TLSv1.2 only
#Default:
# automatic SSL/TLS version negotiation
# TAG: sslproxy_options
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Colon (:) or comma (,) separated list of SSL implementation options
# to use when proxying https:// URLs
#
# The most important being:
#
# NO_SSLv2 Disallow the use of SSLv2
# NO_SSLv3 Disallow the use of SSLv3
# NO_TLSv1 Disallow the use of TLSv1.0
# NO_TLSv1_1 Disallow the use of TLSv1.1
# NO_TLSv1_2 Disallow the use of TLSv1.2
# SINGLE_DH_USE
# Always create a new key when using temporary/ephemeral
# DH key exchanges
# SSL_OP_NO_TICKET
# Disable use of RFC5077 session tickets. Some servers
# may have problems understanding the TLS extension due
# to ambiguous specification in RFC4507.
# ALL Enable various bug workarounds suggested as "harmless"
# by OpenSSL. Be warned that this may reduce SSL/TLS
# strength to some attacks.
#
# See the OpenSSL SSL_CTX_set_options documentation for a
# complete list of possible options.
#
# WARNING: This directive takes a single token. If a space is used
# the value(s) after that space are SILENTLY IGNORED.
#Default:
# none
# TAG: sslproxy_cipher
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# SSL cipher list to use when proxying https:// URLs
#
# Colon separated list of supported ciphers.
#Default:
# none
# TAG: sslproxy_cafile
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# file containing CA certificates to use when verifying server
# certificates while proxying https:// URLs
#Default:
# none
# TAG: sslproxy_capath
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# directory containing CA certificates to use when verifying
# server certificates while proxying https:// URLs
#Default:
# none
# TAG: sslproxy_session_ttl
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Sets the timeout value for SSL sessions
#Default:
# sslproxy_session_ttl 300
# TAG: sslproxy_session_cache_size
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Sets the cache size to use for ssl session
#Default:
# sslproxy_session_cache_size 2 MB
# TAG: sslproxy_cert_sign_hash
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Sets the hashing algorithm to use when signing generated certificates.
# Valid algorithm names depend on the OpenSSL library used. The following
# names are usually available: sha1, sha256, sha512, and md5. Please see
# your OpenSSL library manual for the available hashes. By default, Squids
# that support this option use sha256 hashes.
#
# Squid does not forcefully purge cached certificates that were generated
# with an algorithm other than the currently configured one. They remain
# in the cache, subject to the regular cache eviction policy, and become
# useful if the algorithm changes again.
#Default:
# none
# TAG: ssl_bump
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# This option is consulted when a CONNECT request is received on
# an http_port (or a new connection is intercepted at an
# https_port), provided that port was configured with an ssl-bump
# flag. The subsequent data on the connection is either treated as
# HTTPS and decrypted OR tunneled at TCP level without decryption,
# depending on the first matching bumping "action".
#
# ssl_bump <action> [!]acl ...
#
# The following bumping actions are currently supported:
#
# splice
# Become a TCP tunnel without decrypting proxied traffic.
# This is the default action.
#
# bump
# Establish a secure connection with the server and, using a
# mimicked server certificate, with the client.
#
# peek
# Receive client (step SslBump1) or server (step SslBump2)
# certificate while preserving the possibility of splicing the
# connection. Peeking at the server certificate (during step 2)
# usually precludes bumping of the connection at step 3.
#
# stare
# Receive client (step SslBump1) or server (step SslBump2)
# certificate while preserving the possibility of bumping the
# connection. Staring at the server certificate (during step 2)
# usually precludes splicing of the connection at step 3.
#
# terminate
# Close client and server connections.
#
# Backward compatibility actions available at step SslBump1:
#
# client-first
# Bump the connection. Establish a secure connection with the
# client first, then connect to the server. This old mode does
# not allow Squid to mimic server SSL certificate and does not
# work with intercepted SSL connections.
#
# server-first
# Bump the connection. Establish a secure connection with the
# server first, then establish a secure connection with the
# client, using a mimicked server certificate. Works with both
# CONNECT requests and intercepted SSL connections, but does
# not allow to make decisions based on SSL handshake info.
#
# peek-and-splice
# Decide whether to bump or splice the connection based on
# client-to-squid and server-to-squid SSL hello messages.
# XXX: Remove.
#
# none
# Same as the "splice" action.
#
# All ssl_bump rules are evaluated at each of the supported bumping
# steps. Rules with actions that are impossible at the current step are
# ignored. The first matching ssl_bump action wins and is applied at the
# end of the current step. If no rules match, the splice action is used.
# See the at_step ACL for a list of the supported SslBump steps.
#
# This clause supports both fast and slow acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
# See also: http_port ssl-bump, https_port ssl-bump, and acl at_step.
#
#
# # Example: Bump all requests except those originating from
# # localhost or those going to example.com.
#
# acl broken_sites dstdomain .example.com
# ssl_bump splice localhost
# ssl_bump splice broken_sites
# ssl_bump bump all
#Default:
# Become a TCP tunnel without decrypting proxied traffic.
# TAG: sslproxy_flags
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Various flags modifying the use of SSL while proxying https:// URLs:
# DONT_VERIFY_PEER Accept certificates that fail verification.
# For refined control, see sslproxy_cert_error.
# NO_DEFAULT_CA Don't use the default CA list built in
# to OpenSSL.
#Default:
# none
# TAG: sslproxy_cert_error
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Use this ACL to bypass server certificate validation errors.
#
# For example, the following lines will bypass all validation errors
# when talking to servers for example.com. All other
# validation errors will result in ERR_SECURE_CONNECT_FAIL error.
#
# acl BrokenButTrustedServers dstdomain example.com
# sslproxy_cert_error allow BrokenButTrustedServers
# sslproxy_cert_error deny all
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
# Using slow acl types may result in server crashes
#
# Without this option, all server certificate validation errors
# terminate the transaction to protect Squid and the client.
#
# SQUID_X509_V_ERR_INFINITE_VALIDATION error cannot be bypassed
# but should not happen unless your OpenSSL library is buggy.
#
# SECURITY WARNING:
# Bypassing validation errors is dangerous because an
# error usually implies that the server cannot be trusted
# and the connection may be insecure.
#
# See also: sslproxy_flags and DONT_VERIFY_PEER.
#Default:
# Server certificate errors terminate the transaction.
# TAG: sslproxy_cert_sign
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
#
# sslproxy_cert_sign <signing algorithm> acl ...
#
# The following certificate signing algorithms are supported:
#
# signTrusted
# Sign using the configured CA certificate which is usually
# placed in and trusted by end-user browsers. This is the
# default for trusted origin server certificates.
#
# signUntrusted
# Sign to guarantee an X509_V_ERR_CERT_UNTRUSTED browser error.
# This is the default for untrusted origin server certificates
# that are not self-signed (see ssl::certUntrusted).
#
# signSelf
# Sign using a self-signed certificate with the right CN to
# generate a X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT error in the
# browser. This is the default for self-signed origin server
# certificates (see ssl::certSelfSigned).
#
# This clause only supports fast acl types.
#
# When sslproxy_cert_sign acl(s) match, Squid uses the corresponding
# signing algorithm to generate the certificate and ignores all
# subsequent sslproxy_cert_sign options (the first match wins). If no
# acl(s) match, the default signing algorithm is determined by errors
# detected when obtaining and validating the origin server certificate.
#
# WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can
# be used with sslproxy_cert_adapt, but if and only if Squid is bumping a
# CONNECT request that carries a domain name. In all other cases (CONNECT
# to an IP address or an intercepted SSL connection), Squid cannot detect
# the domain mismatch at certificate generation time when
# bump-server-first is used.
#Default:
# none
# TAG: sslproxy_cert_adapt
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
#
# sslproxy_cert_adapt <adaptation algorithm> acl ...
#
# The following certificate adaptation algorithms are supported:
#
# setValidAfter
# Sets the "Not After" property to the "Not After" property of
# the CA certificate used to sign generated certificates.
#
# setValidBefore
# Sets the "Not Before" property to the "Not Before" property of
# the CA certificate used to sign generated certificates.
#
# setCommonName or setCommonName{CN}
# Sets Subject.CN property to the host name specified as a
# CN parameter or, if no explicit CN parameter was specified,
# extracted from the CONNECT request. It is a misconfiguration
# to use setCommonName without an explicit parameter for
# intercepted or tproxied SSL connections.
#
# This clause only supports fast acl types.
#
# Squid first groups sslproxy_cert_adapt options by adaptation algorithm.
# Within a group, when sslproxy_cert_adapt acl(s) match, Squid uses the
# corresponding adaptation algorithm to generate the certificate and
# ignores all subsequent sslproxy_cert_adapt options in that algorithm's
# group (i.e., the first match wins within each algorithm group). If no
# acl(s) match, the default mimicking action takes place.
#
# WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can
# be used with sslproxy_cert_adapt, but if and only if Squid is bumping a
# CONNECT request that carries a domain name. In all other cases (CONNECT
# to an IP address or an intercepted SSL connection), Squid cannot detect
# the domain mismatch at certificate generation time when
# bump-server-first is used.
#Default:
# none
# TAG: sslpassword_program
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Specify a program used for entering SSL key passphrases
# when using encrypted SSL certificate keys. If not specified
# keys must either be unencrypted, or Squid started with the -N
# option to allow it to query interactively for the passphrase.
#
# The key file name is given as argument to the program allowing
# selection of the right password if you have multiple encrypted
# keys.
#Default:
# none
# OPTIONS RELATING TO EXTERNAL SSL_CRTD
# -----------------------------------------------------------------------------
# TAG: sslcrtd_program
# Note: This option is only available if Squid is rebuilt with the
# --enable-ssl-crtd
#
# Specify the location and options of the executable for ssl_crtd process.
# /usr/lib/squid/ssl_crtd program requires -s and -M parameters
# For more information use:
# /usr/lib/squid/ssl_crtd -h
#Default:
# sslcrtd_program /usr/lib/squid/ssl_crtd -s /var/lib/ssl_db -M 4MB
# TAG: sslcrtd_children
# Note: This option is only available if Squid is rebuilt with the
# --enable-ssl-crtd
#
# The maximum number of processes spawn to service ssl server.
# The maximum this may be safely set to is 32.
#
# The startup= and idle= options allow some measure of skew in your
# tuning.
#
# startup=N
#
# Sets the minimum number of processes to spawn when Squid
# starts or reconfigures. When set to zero the first request will
# cause spawning of the first child process to handle it.
#
# Starting too few children temporary slows Squid under load while it
# tries to spawn enough additional processes to cope with traffic.
#
# idle=N
#
# Sets a minimum of how many processes Squid is to try and keep available
# at all times. When traffic begins to rise above what the existing
# processes can handle this many more will be spawned up to the maximum
# configured. A minimum setting of 1 is required.
#
# You must have at least one ssl_crtd process.
#Default:
# sslcrtd_children 32 startup=5 idle=1
# TAG: sslcrtvalidator_program
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# Specify the location and options of the executable for ssl_crt_validator
# process.
#
# Usage: sslcrtvalidator_program [ttl=n] [cache=n] path ...
#
# Options:
# ttl=n TTL in seconds for cached results. The default is 60 secs
# cache=n limit the result cache size. The default value is 2048
#Default:
# none
# TAG: sslcrtvalidator_children
# Note: This option is only available if Squid is rebuilt with the
# --with-openssl
#
# The maximum number of processes spawn to service SSL server.
# The maximum this may be safely set to is 32.
#
# The startup= and idle= options allow some measure of skew in your
# tuning.
#
# startup=N
#
# Sets the minimum number of processes to spawn when Squid
# starts or reconfigures. When set to zero the first request will
# cause spawning of the first child process to handle it.
#
# Starting too few children temporary slows Squid under load while it
# tries to spawn enough additional processes to cope with traffic.
#
# idle=N
#
# Sets a minimum of how many processes Squid is to try and keep available
# at all times. When traffic begins to rise above what the existing
# processes can handle this many more will be spawned up to the maximum
# configured. A minimum setting of 1 is required.
#
# concurrency=
#
# The number of requests each certificate validator helper can handle in
# parallel. A value of 0 indicates the certficate validator does not
# support concurrency. Defaults to 1.
#
# When this directive is set to a value >= 1 then the protocol
# used to communicate with the helper is modified to include
# a request ID in front of the request/response. The request
# ID from the request must be echoed back with the response
# to that request.
#
# You must have at least one ssl_crt_validator process.
#Default:
# sslcrtvalidator_children 32 startup=5 idle=1 concurrency=1
# OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM
# -----------------------------------------------------------------------------
# TAG: cache_peer
# To specify other caches in a hierarchy, use the format:
#
# cache_peer hostname type http-port icp-port [options]
#
# For example,
#
# # proxy icp
# # hostname type port port options
# # -------------------- -------- ----- ----- -----------
# cache_peer parent.foo.net parent 3128 3130 default
# cache_peer sib1.foo.net sibling 3128 3130 proxy-only
# cache_peer sib2.foo.net sibling 3128 3130 proxy-only
# cache_peer example.com parent 80 0 default
# cache_peer cdn.example.com sibling 3128 0
#
# type: either 'parent', 'sibling', or 'multicast'.
#
# proxy-port: The port number where the peer accept HTTP requests.
# For other Squid proxies this is usually 3128
# For web servers this is usually 80
#
# icp-port: Used for querying neighbor caches about objects.
# Set to 0 if the peer does not support ICP or HTCP.
# See ICP and HTCP options below for additional details.
#
#
# ==== ICP OPTIONS ====
#
# You MUST also set icp_port and icp_access explicitly when using these options.
# The defaults will prevent peer traffic using ICP.
#
#
# no-query Disable ICP queries to this neighbor.
#
# multicast-responder
# Indicates the named peer is a member of a multicast group.
# ICP queries will not be sent directly to the peer, but ICP
# replies will be accepted from it.
#
# closest-only Indicates that, for ICP_OP_MISS replies, we'll only forward
# CLOSEST_PARENT_MISSes and never FIRST_PARENT_MISSes.
#
# background-ping
# To only send ICP queries to this neighbor infrequently.
# This is used to keep the neighbor round trip time updated
# and is usually used in conjunction with weighted-round-robin.
#
#
# ==== HTCP OPTIONS ====
#
# You MUST also set htcp_port and htcp_access explicitly when using these options.
# The defaults will prevent peer traffic using HTCP.
#
#
# htcp Send HTCP, instead of ICP, queries to the neighbor.
# You probably also want to set the "icp-port" to 4827
# instead of 3130. This directive accepts a comma separated
# list of options described below.
#
# htcp=oldsquid Send HTCP to old Squid versions (2.5 or earlier).
#
# htcp=no-clr Send HTCP to the neighbor but without
# sending any CLR requests. This cannot be used with
# only-clr.
#
# htcp=only-clr Send HTCP to the neighbor but ONLY CLR requests.
# This cannot be used with no-clr.
#
# htcp=no-purge-clr
# Send HTCP to the neighbor including CLRs but only when
# they do not result from PURGE requests.
#
# htcp=forward-clr
# Forward any HTCP CLR requests this proxy receives to the peer.
#
#
# ==== PEER SELECTION METHODS ====
#
# The default peer selection method is ICP, with the first responding peer
# being used as source. These options can be used for better load balancing.
#
#
# default This is a parent cache which can be used as a "last-resort"
# if a peer cannot be located by any of the peer-selection methods.
# If specified more than once, only the first is used.
#
# round-robin Load-Balance parents which should be used in a round-robin
# fashion in the absence of any ICP queries.
# weight=N can be used to add bias.
#
# weighted-round-robin
# Load-Balance parents which should be used in a round-robin
# fashion with the frequency of each parent being based on the
# round trip time. Closer parents are used more often.
# Usually used for background-ping parents.
# weight=N can be used to add bias.
#
# carp Load-Balance parents which should be used as a CARP array.
# The requests will be distributed among the parents based on the
# CARP load balancing hash function based on their weight.
#
# userhash Load-balance parents based on the client proxy_auth or ident username.
#
# sourcehash Load-balance parents based on the client source IP.
#
# multicast-siblings
# To be used only for cache peers of type "multicast".
# ALL members of this multicast group have "sibling"
# relationship with it, not "parent". This is to a multicast
# group when the requested object would be fetched only from
# a "parent" cache, anyway. It's useful, e.g., when
# configuring a pool of redundant Squid proxies, being
# members of the same multicast group.
#
#
# ==== PEER SELECTION OPTIONS ====
#
# weight=N use to affect the selection of a peer during any weighted
# peer-selection mechanisms.
# The weight must be an integer; default is 1,
# larger weights are favored more.
# This option does not affect parent selection if a peering
# protocol is not in use.
#
# basetime=N Specify a base amount to be subtracted from round trip
# times of parents.
# It is subtracted before division by weight in calculating
# which parent to fectch from. If the rtt is less than the
# base time the rtt is set to a minimal value.
#
# ttl=N Specify a TTL to use when sending multicast ICP queries
# to this address.
# Only useful when sending to a multicast group.
# Because we don't accept ICP replies from random
# hosts, you must configure other group members as
# peers with the 'multicast-responder' option.
#
# no-delay To prevent access to this neighbor from influencing the
# delay pools.
#
# digest-url=URL Tell Squid to fetch the cache digest (if digests are
# enabled) for this host from the specified URL rather
# than the Squid default location.
#
#
# ==== CARP OPTIONS ====
#
# carp-key=key-specification
# use a different key than the full URL to hash against the peer.
# the key-specification is a comma-separated list of the keywords
# scheme, host, port, path, params
# Order is not important.
#
# ==== ACCELERATOR / REVERSE-PROXY OPTIONS ====
#
# originserver Causes this parent to be contacted as an origin server.
# Meant to be used in accelerator setups when the peer
# is a web server.
#
# forceddomain=name
# Set the Host header of requests forwarded to this peer.
# Useful in accelerator setups where the server (peer)
# expects a certain domain name but clients may request
# others. ie example.com or www.example.com
#
# no-digest Disable request of cache digests.
#
# no-netdb-exchange
# Disables requesting ICMP RTT database (NetDB).
#
#
# ==== AUTHENTICATION OPTIONS ====
#
# login=user:password
# If this is a personal/workgroup proxy and your parent
# requires proxy authentication.
#
# Note: The string can include URL escapes (i.e. %20 for
# spaces). This also means % must be written as %%.
#
# login=PASSTHRU
# Send login details received from client to this peer.
# Both Proxy- and WWW-Authorization headers are passed
# without alteration to the peer.
# Authentication is not required by Squid for this to work.
#
# Note: This will pass any form of authentication but
# only Basic auth will work through a proxy unless the
# connection-auth options are also used.
#
# login=PASS Send login details received from client to this peer.
# Authentication is not required by this option.
#
# If there are no client-provided authentication headers
# to pass on, but username and password are available
# from an external ACL user= and password= result tags
# they may be sent instead.
#
# Note: To combine this with proxy_auth both proxies must
# share the same user database as HTTP only allows for
# a single login (one for proxy, one for origin server).
# Also be warned this will expose your users proxy
# password to the peer. USE WITH CAUTION
#
# login=*:password
# Send the username to the upstream cache, but with a
# fixed password. This is meant to be used when the peer
# is in another administrative domain, but it is still
# needed to identify each user.
# The star can optionally be followed by some extra
# information which is added to the username. This can
# be used to identify this proxy to the peer, similar to
# the login=username:password option above.
#
# login=NEGOTIATE
# If this is a personal/workgroup proxy and your parent
# requires a secure proxy authentication.
# The first principal from the default keytab or defined by
# the environment variable KRB5_KTNAME will be used.
#
# WARNING: The connection may transmit requests from multiple
# clients. Negotiate often assumes end-to-end authentication
# and a single-client. Which is not strictly true here.
#
# login=NEGOTIATE:principal_name
# If this is a personal/workgroup proxy and your parent
# requires a secure proxy authentication.
# The principal principal_name from the default keytab or
# defined by the environment variable KRB5_KTNAME will be
# used.
#
# WARNING: The connection may transmit requests from multiple
# clients. Negotiate often assumes end-to-end authentication
# and a single-client. Which is not strictly true here.
#
# connection-auth=on|off
# Tell Squid that this peer does or not support Microsoft
# connection oriented authentication, and any such
# challenges received from there should be ignored.
# Default is auto to automatically determine the status
# of the peer.
#
#
# ==== SSL / HTTPS / TLS OPTIONS ====
#
# ssl Encrypt connections to this peer with SSL/TLS.
#
# sslcert=/path/to/ssl/certificate
# A client SSL certificate to use when connecting to
# this peer.
#
# sslkey=/path/to/ssl/key
# The private SSL key corresponding to sslcert above.
# If 'sslkey' is not specified 'sslcert' is assumed to
# reference a combined file containing both the
# certificate and the key.
#
# Notes:
#
# On Debian/Ubuntu systems a default snakeoil certificate is
# available in /etc/ssl and users can set:
#
# cert=/etc/ssl/certs/ssl-cert-snakeoil.pem
#
# and
#
# key=/etc/ssl/private/ssl-cert-snakeoil.key
#
# for testing.
#
# sslversion=1|2|3|4|5|6
# The SSL version to use when connecting to this peer
# 1 = automatic (default)
# 2 = SSL v2 only
# 3 = SSL v3 only
# 4 = TLS v1.0 only
# 5 = TLS v1.1 only
# 6 = TLS v1.2 only
#
# sslcipher=... The list of valid SSL ciphers to use when connecting
# to this peer.
#
# ssloptions=... Specify various SSL implementation options:
#
# NO_SSLv2 Disallow the use of SSLv2
# NO_SSLv3 Disallow the use of SSLv3
# NO_TLSv1 Disallow the use of TLSv1.0
# NO_TLSv1_1 Disallow the use of TLSv1.1
# NO_TLSv1_2 Disallow the use of TLSv1.2
# SINGLE_DH_USE
# Always create a new key when using
# temporary/ephemeral DH key exchanges
# ALL Enable various bug workarounds
# suggested as "harmless" by OpenSSL
# Be warned that this reduces SSL/TLS
# strength to some attacks.
#
# See the OpenSSL SSL_CTX_set_options documentation for a
# more complete list.
#
# sslcafile=... A file containing additional CA certificates to use
# when verifying the peer certificate.
#
# sslcapath=... A directory containing additional CA certificates to
# use when verifying the peer certificate.
#
# sslcrlfile=... A certificate revocation list file to use when
# verifying the peer certificate.
#
# sslflags=... Specify various flags modifying the SSL implementation:
#
# DONT_VERIFY_PEER
# Accept certificates even if they fail to
# verify.
# NO_DEFAULT_CA
# Don't use the default CA list built in
# to OpenSSL.
# DONT_VERIFY_DOMAIN
# Don't verify the peer certificate
# matches the server name
#
# ssldomain= The peer name as advertised in it's certificate.
# Used for verifying the correctness of the received peer
# certificate. If not specified the peer hostname will be
# used.
#
# front-end-https
# Enable the "Front-End-Https: On" header needed when
# using Squid as a SSL frontend in front of Microsoft OWA.
# See MS KB document Q307347 for details on this header.
# If set to auto the header will only be added if the
# request is forwarded as a https:// URL.
#
#
# ==== GENERAL OPTIONS ====
#
# connect-timeout=N
# A peer-specific connect timeout.
# Also see the peer_connect_timeout directive.
#
# connect-fail-limit=N
# How many times connecting to a peer must fail before
# it is marked as down. Standby connection failures
# count towards this limit. Default is 10.
#
# allow-miss Disable Squid's use of only-if-cached when forwarding
# requests to siblings. This is primarily useful when
# icp_hit_stale is used by the sibling. Excessive use
# of this option may result in forwarding loops. One way
# to prevent peering loops when using this option, is to
# deny cache peer usage on requests from a peer:
# acl fromPeer ...
# cache_peer_access peerName deny fromPeer
#
# max-conn=N Limit the number of concurrent connections the Squid
# may open to this peer, including already opened idle
# and standby connections. There is no peer-specific
# connection limit by default.
#
# A peer exceeding the limit is not used for new
# requests unless a standby connection is available.
#
# max-conn currently works poorly with idle persistent
# connections: When a peer reaches its max-conn limit,
# and there are idle persistent connections to the peer,
# the peer may not be selected because the limiting code
# does not know whether Squid can reuse those idle
# connections.
#
# standby=N Maintain a pool of N "hot standby" connections to an
# UP peer, available for requests when no idle
# persistent connection is available (or safe) to use.
# By default and with zero N, no such pool is maintained.
# N must not exceed the max-conn limit (if any).
#
# At start or after reconfiguration, Squid opens new TCP
# standby connections until there are N connections
# available and then replenishes the standby pool as
# opened connections are used up for requests. A used
# connection never goes back to the standby pool, but
# may go to the regular idle persistent connection pool
# shared by all peers and origin servers.
#
# Squid never opens multiple new standby connections
# concurrently. This one-at-a-time approach minimizes
# flooding-like effect on peers. Furthermore, just a few
# standby connections should be sufficient in most cases
# to supply most new requests with a ready-to-use
# connection.
#
# Standby connections obey server_idle_pconn_timeout.
# For the feature to work as intended, the peer must be
# configured to accept and keep them open longer than
# the idle timeout at the connecting Squid, to minimize
# race conditions typical to idle used persistent
# connections. Default request_timeout and
# server_idle_pconn_timeout values ensure such a
# configuration.
#
# name=xxx Unique name for the peer.
# Required if you have multiple peers on the same host
# but different ports.
# This name can be used in cache_peer_access and similar
# directives to identify the peer.
# Can be used by outgoing access controls through the
# peername ACL type.
#
# no-tproxy Do not use the client-spoof TPROXY support when forwarding
# requests to this peer. Use normal address selection instead.
# This overrides the spoof_client_ip ACL.
#
# proxy-only objects fetched from the peer will not be stored locally.
#
#Default:
# none
# TAG: cache_peer_domain
# Use to limit the domains for which a neighbor cache will be
# queried.
#
# Usage:
# cache_peer_domain cache-host domain [domain ...]
# cache_peer_domain cache-host !domain
#
# For example, specifying
#
# cache_peer_domain parent.foo.net .edu
#
# has the effect such that UDP query packets are sent to
# 'bigserver' only when the requested object exists on a
# server in the .edu domain. Prefixing the domainname
# with '!' means the cache will be queried for objects
# NOT in that domain.
#
# NOTE: * Any number of domains may be given for a cache-host,
# either on the same or separate lines.
# * When multiple domains are given for a particular
# cache-host, the first matched domain is applied.
# * Cache hosts with no domain restrictions are queried
# for all requests.
# * There are no defaults.
# * There is also a 'cache_peer_access' tag in the ACL
# section.
#Default:
# none
# TAG: cache_peer_access
# Restricts usage of cache_peer proxies.
#
# Usage:
# cache_peer_access peer-name allow|deny [!]aclname ...
#
# For the required peer-name parameter, use either the value of the
# cache_peer name=value parameter or, if name=value is missing, the
# cache_peer hostname parameter.
#
# This directive narrows down the selection of peering candidates, but
# does not determine the order in which the selected candidates are
# contacted. That order is determined by the peer selection algorithms
# (see PEER SELECTION sections in the cache_peer documentation).
#
# If a deny rule matches, the corresponding peer will not be contacted
# for the current transaction -- Squid will not send ICP queries and
# will not forward HTTP requests to that peer. An allow match leaves
# the corresponding peer in the selection. The first match for a given
# peer wins for that peer.
#
# The relative order of cache_peer_access directives for the same peer
# matters. The relative order of any two cache_peer_access directives
# for different peers does not matter. To ease interpretation, it is a
# good idea to group cache_peer_access directives for the same peer
# together.
#
# A single cache_peer_access directive may be evaluated multiple times
# for a given transaction because individual peer selection algorithms
# may check it independently from each other. These redundant checks
# may be optimized away in future Squid versions.
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# No peer usage restrictions.
# TAG: neighbor_type_domain
# Modify the cache_peer neighbor type when passing requests
# about specific domains to the peer.
#
# Usage:
# neighbor_type_domain neighbor parent|sibling domain domain ...
#
# For example:
# cache_peer foo.example.com parent 3128 3130
# neighbor_type_domain foo.example.com sibling .au .de
#
# The above configuration treats all requests to foo.example.com as a
# parent proxy unless the request is for a .au or .de ccTLD domain name.
#Default:
# The peer type from cache_peer directive is used for all requests to that peer.
# TAG: dead_peer_timeout (seconds)
# This controls how long Squid waits to declare a peer cache
# as "dead." If there are no ICP replies received in this
# amount of time, Squid will declare the peer dead and not
# expect to receive any further ICP replies. However, it
# continues to send ICP queries, and will mark the peer as
# alive upon receipt of the first subsequent ICP reply.
#
# This timeout also affects when Squid expects to receive ICP
# replies from peers. If more than 'dead_peer' seconds have
# passed since the last ICP reply was received, Squid will not
# expect to receive an ICP reply on the next query. Thus, if
# your time between requests is greater than this timeout, you
# will see a lot of requests sent DIRECT to origin servers
# instead of to your parents.
#Default:
# dead_peer_timeout 10 seconds
# TAG: forward_max_tries
# Controls how many different forward paths Squid will try
# before giving up. See also forward_timeout.
#
# NOTE: connect_retries (default: none) can make each of these
# possible forwarding paths be tried multiple times.
#Default:
# forward_max_tries 25
# MEMORY CACHE OPTIONS
# -----------------------------------------------------------------------------
# TAG: cache_mem (bytes)
# NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE.
# IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL
# USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER
# THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS.
#
# 'cache_mem' specifies the ideal amount of memory to be used
# for:
# * In-Transit objects
# * Hot Objects
# * Negative-Cached objects
#
# Data for these objects are stored in 4 KB blocks. This
# parameter specifies the ideal upper limit on the total size of
# 4 KB blocks allocated. In-Transit objects take the highest
# priority.
#
# In-transit objects have priority over the others. When
# additional space is needed for incoming data, negative-cached
# and hot objects will be released. In other words, the
# negative-cached and hot objects will fill up any unused space
# not needed for in-transit objects.
#
# If circumstances require, this limit will be exceeded.
# Specifically, if your incoming request rate requires more than
# 'cache_mem' of memory to hold in-transit objects, Squid will
# exceed this limit to satisfy the new requests. When the load
# decreases, blocks will be freed until the high-water mark is
# reached. Thereafter, blocks will be used to store hot
# objects.
#
# If shared memory caching is enabled, Squid does not use the shared
# cache space for in-transit objects, but they still consume as much
# local memory as they need. For more details about the shared memory
# cache, see memory_cache_shared.
#Default:
# cache_mem 256 MB
# TAG: maximum_object_size_in_memory (bytes)
# Objects greater than this size will not be attempted to kept in
# the memory cache. This should be set high enough to keep objects
# accessed frequently in memory to improve performance whilst low
# enough to keep larger objects from hoarding cache_mem.
#Default:
# maximum_object_size_in_memory 512 KB
# TAG: memory_cache_shared on|off
# Controls whether the memory cache is shared among SMP workers.
#
# The shared memory cache is meant to occupy cache_mem bytes and replace
# the non-shared memory cache, although some entities may still be
# cached locally by workers for now (e.g., internal and in-transit
# objects may be served from a local memory cache even if shared memory
# caching is enabled).
#
# By default, the memory cache is shared if and only if all of the
# following conditions are satisfied: Squid runs in SMP mode with
# multiple workers, cache_mem is positive, and Squid environment
# supports required IPC primitives (e.g., POSIX shared memory segments
# and GCC-style atomic operations).
#
# To avoid blocking locks, shared memory uses opportunistic algorithms
# that do not guarantee that every cachable entity that could have been
# shared among SMP workers will actually be shared.
#
# Currently, entities exceeding 32KB in size cannot be shared.
#Default:
# "on" where supported if doing memory caching with multiple SMP workers.
# TAG: memory_cache_mode
# Controls which objects to keep in the memory cache (cache_mem)
#
# always Keep most recently fetched objects in memory (default)
#
# disk Only disk cache hits are kept in memory, which means
# an object must first be cached on disk and then hit
# a second time before cached in memory.
#
# network Only objects fetched from network is kept in memory
#Default:
# Keep the most recently fetched objects in memory
# TAG: memory_replacement_policy
# The memory replacement policy parameter determines which
# objects are purged from memory when memory space is needed.
#
# See cache_replacement_policy for details on algorithms.
#Default:
# memory_replacement_policy lru
# DISK CACHE OPTIONS
# -----------------------------------------------------------------------------
# TAG: cache_replacement_policy
# The cache replacement policy parameter determines which
# objects are evicted (replaced) when disk space is needed.
#
# lru : Squid's original list based LRU policy
# heap GDSF : Greedy-Dual Size Frequency
# heap LFUDA: Least Frequently Used with Dynamic Aging
# heap LRU : LRU policy implemented using a heap
#
# Applies to any cache_dir lines listed below this directive.
#
# The LRU policies keeps recently referenced objects.
#
# The heap GDSF policy optimizes object hit rate by keeping smaller
# popular objects in cache so it has a better chance of getting a
# hit. It achieves a lower byte hit rate than LFUDA though since
# it evicts larger (possibly popular) objects.
#
# The heap LFUDA policy keeps popular objects in cache regardless of
# their size and thus optimizes byte hit rate at the expense of
# hit rate since one large, popular object will prevent many
# smaller, slightly less popular objects from being cached.
#
# Both policies utilize a dynamic aging mechanism that prevents
# cache pollution that can otherwise occur with frequency-based
# replacement policies.
#
# NOTE: if using the LFUDA replacement policy you should increase
# the value of maximum_object_size above its default of 4 MB to
# to maximize the potential byte hit rate improvement of LFUDA.
#
# For more information about the GDSF and LFUDA cache replacement
# policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html
# and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html.
#Default:
# cache_replacement_policy lru
# TAG: minimum_object_size (bytes)
# Objects smaller than this size will NOT be saved on disk. The
# value is specified in bytes, and the default is 0 KB, which
# means all responses can be stored.
#Default:
# no limit
# TAG: maximum_object_size (bytes)
# Set the default value for max-size parameter on any cache_dir.
# The value is specified in bytes, and the default is 4 MB.
#
# If you wish to get a high BYTES hit ratio, you should probably
# increase this (one 32 MB object hit counts for 3200 10KB
# hits).
#
# If you wish to increase hit ratio more than you want to
# save bandwidth you should leave this low.
#
# NOTE: if using the LFUDA replacement policy you should increase
# this value to maximize the byte hit rate improvement of LFUDA!
# See cache_replacement_policy for a discussion of this policy.
#Default:
# maximum_object_size 4 MB
# TAG: cache_dir
# Format:
# cache_dir Type Directory-Name Fs-specific-data [options]
#
# You can specify multiple cache_dir lines to spread the
# cache among different disk partitions.
#
# Type specifies the kind of storage system to use. Only "ufs"
# is built by default. To enable any of the other storage systems
# see the --enable-storeio configure option.
#
# 'Directory' is a top-level directory where cache swap
# files will be stored. If you want to use an entire disk
# for caching, this can be the mount-point directory.
# The directory must exist and be writable by the Squid
# process. Squid will NOT create this directory for you.
#
# In SMP configurations, cache_dir must not precede the workers option
# and should use configuration macros or conditionals to give each
# worker interested in disk caching a dedicated cache directory.
#
#
# ==== The ufs store type ====
#
# "ufs" is the old well-known Squid storage format that has always
# been there.
#
# Usage:
# cache_dir ufs Directory-Name Mbytes L1 L2 [options]
#
# 'Mbytes' is the amount of disk space (MB) to use under this
# directory. The default is 100 MB. Change this to suit your
# configuration. Do NOT put the size of your disk drive here.
# Instead, if you want Squid to use the entire disk drive,
# subtract 20% and use that value.
#
# 'L1' is the number of first-level subdirectories which
# will be created under the 'Directory'. The default is 16.
#
# 'L2' is the number of second-level subdirectories which
# will be created under each first-level directory. The default
# is 256.
#
#
# ==== The aufs store type ====
#
# "aufs" uses the same storage format as "ufs", utilizing
# POSIX-threads to avoid blocking the main Squid process on
# disk-I/O. This was formerly known in Squid as async-io.
#
# Usage:
# cache_dir aufs Directory-Name Mbytes L1 L2 [options]
#
# see argument descriptions under ufs above
#
#
# ==== The diskd store type ====
#
# "diskd" uses the same storage format as "ufs", utilizing a
# separate process to avoid blocking the main Squid process on
# disk-I/O.
#
# Usage:
# cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n]
#
# see argument descriptions under ufs above
#
# Q1 specifies the number of unacknowledged I/O requests when Squid
# stops opening new files. If this many messages are in the queues,
# Squid won't open new files. Default is 64
#
# Q2 specifies the number of unacknowledged messages when Squid
# starts blocking. If this many messages are in the queues,
# Squid blocks until it receives some replies. Default is 72
#
# When Q1 < Q2 (the default), the cache directory is optimized
# for lower response time at the expense of a decrease in hit
# ratio. If Q1 > Q2, the cache directory is optimized for
# higher hit ratio at the expense of an increase in response
# time.
#
#
# ==== The rock store type ====
#
# Usage:
# cache_dir rock Directory-Name Mbytes [options]
#
# The Rock Store type is a database-style storage. All cached
# entries are stored in a "database" file, using fixed-size slots.
# A single entry occupies one or more slots.
#
# If possible, Squid using Rock Store creates a dedicated kid
# process called "disker" to avoid blocking Squid worker(s) on disk
# I/O. One disker kid is created for each rock cache_dir. Diskers
# are created only when Squid, running in daemon mode, has support
# for the IpcIo disk I/O module.
#
# swap-timeout=msec: Squid will not start writing a miss to or
# reading a hit from disk if it estimates that the swap operation
# will take more than the specified number of milliseconds. By
# default and when set to zero, disables the disk I/O time limit
# enforcement. Ignored when using blocking I/O module because
# blocking synchronous I/O does not allow Squid to estimate the
# expected swap wait time.
#
# max-swap-rate=swaps/sec: Artificially limits disk access using
# the specified I/O rate limit. Swap out requests that
# would cause the average I/O rate to exceed the limit are
# delayed. Individual swap in requests (i.e., hits or reads) are
# not delayed, but they do contribute to measured swap rate and
# since they are placed in the same FIFO queue as swap out
# requests, they may wait longer if max-swap-rate is smaller.
# This is necessary on file systems that buffer "too
# many" writes and then start blocking Squid and other processes
# while committing those writes to disk. Usually used together
# with swap-timeout to avoid excessive delays and queue overflows
# when disk demand exceeds available disk "bandwidth". By default
# and when set to zero, disables the disk I/O rate limit
# enforcement. Currently supported by IpcIo module only.
#
# slot-size=bytes: The size of a database "record" used for
# storing cached responses. A cached response occupies at least
# one slot and all database I/O is done using individual slots so
# increasing this parameter leads to more disk space waste while
# decreasing it leads to more disk I/O overheads. Should be a
# multiple of your operating system I/O page size. Defaults to
# 16KBytes. A housekeeping header is stored with each slot and
# smaller slot-sizes will be rejected. The header is smaller than
# 100 bytes.
#
#
# ==== COMMON OPTIONS ====
#
# no-store no new objects should be stored to this cache_dir.
#
# min-size=n the minimum object size in bytes this cache_dir
# will accept. It's used to restrict a cache_dir
# to only store large objects (e.g. AUFS) while
# other stores are optimized for smaller objects
# (e.g. Rock).
# Defaults to 0.
#
# max-size=n the maximum object size in bytes this cache_dir
# supports.
# The value in maximum_object_size directive sets
# the default unless more specific details are
# available (ie a small store capacity).
#
# Note: To make optimal use of the max-size limits you should order
# the cache_dir lines with the smallest max-size value first.
#
#Default:
# No disk cache. Store cache ojects only in memory.
#
# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256
# TAG: store_dir_select_algorithm
# How Squid selects which cache_dir to use when the response
# object will fit into more than one.
#
# Regardless of which algorithm is used the cache_dir min-size
# and max-size parameters are obeyed. As such they can affect
# the selection algorithm by limiting the set of considered
# cache_dir.
#
# Algorithms:
#
# least-load
#
# This algorithm is suited to caches with similar cache_dir
# sizes and disk speeds.
#
# The disk with the least I/O pending is selected.
# When there are multiple disks with the same I/O load ranking
# the cache_dir with most available capacity is selected.
#
# When a mix of cache_dir sizes are configured the faster disks
# have a naturally lower I/O loading and larger disks have more
# capacity. So space used to store objects and data throughput
# may be very unbalanced towards larger disks.
#
#
# round-robin
#
# This algorithm is suited to caches with unequal cache_dir
# disk sizes.
#
# Each cache_dir is selected in a rotation. The next suitable
# cache_dir is used.
#
# Available cache_dir capacity is only considered in relation
# to whether the object will fit and meets the min-size and
# max-size parameters.
#
# Disk I/O loading is only considered to prevent overload on slow
# disks. This algorithm does not spread objects by size, so any
# I/O loading per-disk may appear very unbalanced and volatile.
#
# If several cache_dirs use similar min-size, max-size, or other
# limits to to reject certain responses, then do not group such
# cache_dir lines together, to avoid round-robin selection bias
# towards the first cache_dir after the group. Instead, interleave
# cache_dir lines from different groups. For example:
#
# store_dir_select_algorithm round-robin
# cache_dir rock /hdd1 ... min-size=100000
# cache_dir rock /ssd1 ... max-size=99999
# cache_dir rock /hdd2 ... min-size=100000
# cache_dir rock /ssd2 ... max-size=99999
# cache_dir rock /hdd3 ... min-size=100000
# cache_dir rock /ssd3 ... max-size=99999
#Default:
# store_dir_select_algorithm least-load
# TAG: max_open_disk_fds
# To avoid having disk as the I/O bottleneck Squid can optionally
# bypass the on-disk cache if more than this amount of disk file
# descriptors are open.
#
# A value of 0 indicates no limit.
#Default:
# no limit
# TAG: cache_swap_low (percent, 0-100)
# The low-water mark for AUFS/UFS/diskd cache object eviction by
# the cache_replacement_policy algorithm.
#
# Removal begins when the swap (disk) usage of a cache_dir is
# above this low-water mark and attempts to maintain utilization
# near the low-water mark.
#
# As swap utilization increases towards the high-water mark set
# by cache_swap_high object eviction becomes more agressive.
#
# The value difference in percentages between low- and high-water
# marks represent an eviction rate of 300 objects per second and
# the rate continues to scale in agressiveness by multiples of
# this above the high-water mark.
#
# Defaults are 90% and 95%. If you have a large cache, 5% could be
# hundreds of MB. If this is the case you may wish to set these
# numbers closer together.
#
# See also cache_swap_high and cache_replacement_policy
#Default:
# cache_swap_low 90
# TAG: cache_swap_high (percent, 0-100)
# The high-water mark for AUFS/UFS/diskd cache object eviction by
# the cache_replacement_policy algorithm.
#
# Removal begins when the swap (disk) usage of a cache_dir is
# above the low-water mark set by cache_swap_low and attempts to
# maintain utilization near the low-water mark.
#
# As swap utilization increases towards this high-water mark object
# eviction becomes more agressive.
#
# The value difference in percentages between low- and high-water
# marks represent an eviction rate of 300 objects per second and
# the rate continues to scale in agressiveness by multiples of
# this above the high-water mark.
#
# Defaults are 90% and 95%. If you have a large cache, 5% could be
# hundreds of MB. If this is the case you may wish to set these
# numbers closer together.
#
# See also cache_swap_low and cache_replacement_policy
#Default:
# cache_swap_high 95
# LOGFILE OPTIONS
# -----------------------------------------------------------------------------
# TAG: logformat
# Usage:
#
# logformat <name> <format specification>
#
# Defines an access log format.
#
# The <format specification> is a string with embedded % format codes
#
# % format codes all follow the same basic structure where all but
# the formatcode is optional. Output strings are automatically escaped
# as required according to their context and the output format
# modifiers are usually not needed, but can be specified if an explicit
# output format is desired.
#
# % ["|[|'|#] [-] [[0]width] [{argument}] formatcode
#
# " output in quoted string format
# [ output in squid text log format as used by log_mime_hdrs
# # output in URL quoted format
# ' output as-is
#
# - left aligned
#
# width minimum and/or maximum field width:
# [width_min][.width_max]
# When minimum starts with 0, the field is zero-padded.
# String values exceeding maximum width are truncated.
#
# {arg} argument such as header name etc
#
# Format codes:
#
# % a literal % character
# sn Unique sequence number per log line entry
# err_code The ID of an error response served by Squid or
# a similar internal error identifier.
# err_detail Additional err_code-dependent error information.
# note The annotation specified by the argument. Also
# logs the adaptation meta headers set by the
# adaptation_meta configuration parameter.
# If no argument given all annotations logged.
# The argument may include a separator to use with
# annotation values:
# name[:separator]
# By default, multiple note values are separated with ","
# and multiple notes are separated with "\r\n".
# When logging named notes with %{name}note, the
# explicitly configured separator is used between note
# values. When logging all notes with %note, the
# explicitly configured separator is used between
# individual notes. There is currently no way to
# specify both value and notes separators when logging
# all notes with %note.
#
# Connection related format codes:
#
# >a Client source IP address
# >A Client FQDN
# >p Client source port
# >eui Client source EUI (MAC address, EUI-48 or EUI-64 identifier)
# >la Local IP address the client connected to
# >lp Local port number the client connected to
# >qos Client connection TOS/DSCP value set by Squid
# >nfmark Client connection netfilter mark set by Squid
#
# la Local listening IP address the client connection was connected to.
# lp Local listening port number the client connection was connected to.
#
# <a Server IP address of the last server or peer connection
# <A Server FQDN or peer name
# <p Server port number of the last server or peer connection
# <la Local IP address of the last server or peer connection
# <lp Local port number of the last server or peer connection
# <qos Server connection TOS/DSCP value set by Squid
# <nfmark Server connection netfilter mark set by Squid
#
# Time related format codes:
#
# ts Seconds since epoch
# tu subsecond time (milliseconds)
# tl Local time. Optional strftime format argument
# default %d/%b/%Y:%H:%M:%S %z
# tg GMT time. Optional strftime format argument
# default %d/%b/%Y:%H:%M:%S %z
# tr Response time (milliseconds)
# dt Total time spent making DNS lookups (milliseconds)
# tS Approximate master transaction start time in
# <full seconds since epoch>.<fractional seconds> format.
# Currently, Squid considers the master transaction
# started when a complete HTTP request header initiating
# the transaction is received from the client. This is
# the same value that Squid uses to calculate transaction
# response time when logging %tr to access.log. Currently,
# Squid uses millisecond resolution for %tS values,
# similar to the default access.log "current time" field
# (%ts.%03tu).
#
# Access Control related format codes:
#
# et Tag returned by external acl
# ea Log string returned by external acl
# un User name (any available)
# ul User name from authentication
# ue User name from external acl helper
# ui User name from ident
# un A user name. Expands to the first available name
# from the following list of information sources:
# - authenticated user name, like %ul
# - user name supplied by an external ACL, like %ue
# - SSL client name, like %us
# - ident user name, like %ui
# credentials Client credentials. The exact meaning depends on
# the authentication scheme: For Basic authentication,
# it is the password; for Digest, the realm sent by the
# client; for NTLM and Negotiate, the client challenge
# or client credentials prefixed with "YR " or "KK ".
#
# HTTP related format codes:
#
# REQUEST
#
# [http::]rm Request method (GET/POST etc)
# [http::]>rm Request method from client
# [http::]<rm Request method sent to server or peer
# [http::]ru Request URL from client (historic, filtered for logging)
# [http::]>ru Request URL from client
# [http::]<ru Request URL sent to server or peer
# [http::]>rs Request URL scheme from client
# [http::]<rs Request URL scheme sent to server or peer
# [http::]>rd Request URL domain from client
# [http::]<rd Request URL domain sent to server or peer
# [http::]>rP Request URL port from client
# [http::]<rP Request URL port sent to server or peer
# [http::]rp Request URL path excluding hostname
# [http::]>rp Request URL path excluding hostname from client
# [http::]<rp Request URL path excluding hostname sent to server or peer
# [http::]rv Request protocol version
# [http::]>rv Request protocol version from client
# [http::]<rv Request protocol version sent to server or peer
#
# [http::]>h Original received request header.
# Usually differs from the request header sent by
# Squid, although most fields are often preserved.
# Accepts optional header field name/value filter
# argument using name[:[separator]element] format.
# [http::]>ha Received request header after adaptation and
# redirection (pre-cache REQMOD vectoring point).
# Usually differs from the request header sent by
# Squid, although most fields are often preserved.
# Optional header name argument as for >h
#
#
# RESPONSE
#
# [http::]<Hs HTTP status code received from the next hop
# [http::]>Hs HTTP status code sent to the client
#
# [http::]<h Reply header. Optional header name argument
# as for >h
#
# [http::]mt MIME content type
#
#
# SIZE COUNTERS
#
# [http::]st Total size of request + reply traffic with client
# [http::]>st Total size of request received from client.
# Excluding chunked encoding bytes.
# [http::]<st Total size of reply sent to client (after adaptation)
#
# [http::]>sh Size of request headers received from client
# [http::]<sh Size of reply headers sent to client (after adaptation)
#
# [http::]<sH Reply high offset sent
# [http::]<sS Upstream object size
#
# [http::]<bs Number of HTTP-equivalent message body bytes
# received from the next hop, excluding chunked
# transfer encoding and control messages.
# Generated FTP/Gopher listings are treated as
# received bodies.
#
#
# TIMING
#
# [http::]<pt Peer response time in milliseconds. The timer starts
# when the last request byte is sent to the next hop
# and stops when the last response byte is received.
# [http::]<tt Total time in milliseconds. The timer
# starts with the first connect request (or write I/O)
# sent to the first selected peer. The timer stops
# with the last I/O with the last peer.
#
# Squid handling related format codes:
#
# Ss Squid request status (TCP_MISS etc)
# Sh Squid hierarchy status (DEFAULT_PARENT etc)
#
# SSL-related format codes:
#
# ssl::bump_mode SslBump decision for the transaction:
#
# For CONNECT requests that initiated bumping of
# a connection and for any request received on
# an already bumped connection, Squid logs the
# corresponding SslBump mode ("server-first" or
# "client-first"). See the ssl_bump option for
# more information about these modes.
#
# A "none" token is logged for requests that
# triggered "ssl_bump" ACL evaluation matching
# either a "none" rule or no rules at all.
#
# In all other cases, a single dash ("-") is
# logged.
#
# ssl::>sni SSL client SNI sent to Squid. Available only
# after the peek, stare, or splice SSL bumping
# actions.
#
# If ICAP is enabled, the following code becomes available (as
# well as ICAP log codes documented with the icap_log option):
#
# icap::tt Total ICAP processing time for the HTTP
# transaction. The timer ticks when ICAP
# ACLs are checked and when ICAP
# transaction is in progress.
#
# If adaptation is enabled the following three codes become available:
#
# adapt::<last_h The header of the last ICAP response or
# meta-information from the last eCAP
# transaction related to the HTTP transaction.
# Like <h, accepts an optional header name
# argument.
#
# adapt::sum_trs Summed adaptation transaction response
# times recorded as a comma-separated list in
# the order of transaction start time. Each time
# value is recorded as an integer number,
# representing response time of one or more
# adaptation (ICAP or eCAP) transaction in
# milliseconds. When a failed transaction is
# being retried or repeated, its time is not
# logged individually but added to the
# replacement (next) transaction. See also:
# adapt::all_trs.
#
# adapt::all_trs All adaptation transaction response times.
# Same as adaptation_strs but response times of
# individual transactions are never added
# together. Instead, all transaction response
# times are recorded individually.
#
# You can prefix adapt::*_trs format codes with adaptation
# service name in curly braces to record response time(s) specific
# to that service. For example: %{my_service}adapt::sum_trs
#
# If SSL is enabled, the following formating codes become available:
#
# %ssl::>cert_subject The Subject field of the received client
# SSL certificate or a dash ('-') if Squid has
# received an invalid/malformed certificate or
# no certificate at all. Consider encoding the
# logged value because Subject often has spaces.
#
# %ssl::>cert_issuer The Issuer field of the received client
# SSL certificate or a dash ('-') if Squid has
# received an invalid/malformed certificate or
# no certificate at all. Consider encoding the
# logged value because Issuer often has spaces.
#
# The default formats available (which do not need re-defining) are:
#
#logformat squid %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt
#logformat common %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh
#logformat combined %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
#logformat referrer %ts.%03tu %>a %{Referer}>h %ru
#logformat useragent %>a [%tl] "%{User-Agent}>h"
#
# NOTE: When the log_mime_hdrs directive is set to ON.
# The squid, common and combined formats have a safely encoded copy
# of the mime headers appended to each line within a pair of brackets.
#
# NOTE: The common and combined formats are not quite true to the Apache definition.
# The logs from Squid contain an extra status and hierarchy code appended.
#
#Default:
# The format definitions squid, common, combined, referrer, useragent are built in.
# TAG: access_log
# Configures whether and how Squid logs HTTP and ICP transactions.
# If access logging is enabled, a single line is logged for every
# matching HTTP or ICP request. The recommended directive formats are:
#
# access_log <module>:<place> [option ...] [acl acl ...]
# access_log none [acl acl ...]
#
# The following directive format is accepted but may be deprecated:
# access_log <module>:<place> [<logformat name> [acl acl ...]]
#
# In most cases, the first ACL name must not contain the '=' character
# and should not be equal to an existing logformat name. You can always
# start with an 'all' ACL to work around those restrictions.
#
# Will log to the specified module:place using the specified format (which
# must be defined in a logformat directive) those entries which match
# ALL the acl's specified (which must be defined in acl clauses).
# If no acl is specified, all requests will be logged to this destination.
#
# ===== Available options for the recommended directive format =====
#
# logformat=name Names log line format (either built-in or
# defined by a logformat directive). Defaults
# to 'squid'.
#
# buffer-size=64KB Defines approximate buffering limit for log
# records (see buffered_logs). Squid should not
# keep more than the specified size and, hence,
# should flush records before the buffer becomes
# full to avoid overflows under normal
# conditions (the exact flushing algorithm is
# module-dependent though). The on-error option
# controls overflow handling.
#
# on-error=die|drop Defines action on unrecoverable errors. The
# 'drop' action ignores (i.e., does not log)
# affected log records. The default 'die' action
# kills the affected worker. The drop action
# support has not been tested for modules other
# than tcp.
#
# ===== Modules Currently available =====
#
# none Do not log any requests matching these ACL.
# Do not specify Place or logformat name.
#
# stdio Write each log line to disk immediately at the completion of
# each request.
# Place: the filename and path to be written.
#
# daemon Very similar to stdio. But instead of writing to disk the log
# line is passed to a daemon helper for asychronous handling instead.
# Place: varies depending on the daemon.
#
# log_file_daemon Place: the file name and path to be written.
#
# syslog To log each request via syslog facility.
# Place: The syslog facility and priority level for these entries.
# Place Format: facility.priority
#
# where facility could be any of:
# authpriv, daemon, local0 ... local7 or user.
#
# And priority could be any of:
# err, warning, notice, info, debug.
#
# udp To send each log line as text data to a UDP receiver.
# Place: The destination host name or IP and port.
# Place Format: //host:port
#
# tcp To send each log line as text data to a TCP receiver.
# Lines may be accumulated before sending (see buffered_logs).
# Place: The destination host name or IP and port.
# Place Format: //host:port
#
# Default:
# access_log daemon:/var/log/squid/access.log squid
#Default:
# access_log daemon:/var/log/squid/access.log squid
# TAG: icap_log
# ICAP log files record ICAP transaction summaries, one line per
# transaction.
#
# The icap_log option format is:
# icap_log <filepath> [<logformat name> [acl acl ...]]
# icap_log none [acl acl ...]]
#
# Please see access_log option documentation for details. The two
# kinds of logs share the overall configuration approach and many
# features.
#
# ICAP processing of a single HTTP message or transaction may
# require multiple ICAP transactions. In such cases, multiple
# ICAP transaction log lines will correspond to a single access
# log line.
#
# ICAP log uses logformat codes that make sense for an ICAP
# transaction. Header-related codes are applied to the HTTP header
# embedded in an ICAP server response, with the following caveats:
# For REQMOD, there is no HTTP response header unless the ICAP
# server performed request satisfaction. For RESPMOD, the HTTP
# request header is the header sent to the ICAP server. For
# OPTIONS, there are no HTTP headers.
#
# The following format codes are also available for ICAP logs:
#
# icap::<A ICAP server IP address. Similar to <A.
#
# icap::<service_name ICAP service name from the icap_service
# option in Squid configuration file.
#
# icap::ru ICAP Request-URI. Similar to ru.
#
# icap::rm ICAP request method (REQMOD, RESPMOD, or
# OPTIONS). Similar to existing rm.
#
# icap::>st Bytes sent to the ICAP server (TCP payload
# only; i.e., what Squid writes to the socket).
#
# icap::<st Bytes received from the ICAP server (TCP
# payload only; i.e., what Squid reads from
# the socket).
#
# icap::<bs Number of message body bytes received from the
# ICAP server. ICAP message body, if any, usually
# includes encapsulated HTTP message headers and
# possibly encapsulated HTTP message body. The
# HTTP body part is dechunked before its size is
# computed.
#
# icap::tr Transaction response time (in
# milliseconds). The timer starts when
# the ICAP transaction is created and
# stops when the transaction is completed.
# Similar to tr.
#
# icap::tio Transaction I/O time (in milliseconds). The
# timer starts when the first ICAP request
# byte is scheduled for sending. The timers
# stops when the last byte of the ICAP response
# is received.
#
# icap::to Transaction outcome: ICAP_ERR* for all
# transaction errors, ICAP_OPT for OPTION
# transactions, ICAP_ECHO for 204
# responses, ICAP_MOD for message
# modification, and ICAP_SAT for request
# satisfaction. Similar to Ss.
#
# icap::Hs ICAP response status code. Similar to Hs.
#
# icap::>h ICAP request header(s). Similar to >h.
#
# icap::<h ICAP response header(s). Similar to <h.
#
# The default ICAP log format, which can be used without an explicit
# definition, is called icap_squid:
#
#logformat icap_squid %ts.%03tu %6icap::tr %>a %icap::to/%03icap::Hs %icap::<size %icap::rm %icap::ru% %un -/%icap::<A -
#
# See also: logformat, log_icap, and %adapt::<last_h
#Default:
# none
# TAG: logfile_daemon
# Specify the path to the logfile-writing daemon. This daemon is
# used to write the access and store logs, if configured.
#
# Squid sends a number of commands to the log daemon:
# L<data>\n - logfile data
# R\n - rotate file
# T\n - truncate file
# O\n - reopen file
# F\n - flush file
# r<n>\n - set rotate count to <n>
# b<n>\n - 1 = buffer output, 0 = don't buffer output
#
# No responses is expected.
#Default:
# logfile_daemon /usr/lib/squid/log_file_daemon
# TAG: stats_collection allow|deny acl acl...
# This options allows you to control which requests gets accounted
# in performance counters.
#
# This clause only supports fast acl types.
# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# Allow logging for all transactions.
# TAG: cache_store_log
# Logs the activities of the storage manager. Shows which
# objects are ejected from the cache, and which objects are
# saved and for how long.
# There are not really utilities to analyze this data, so you can safely
# disable it (the default).
#
# Store log uses modular logging outputs. See access_log for the list
# of modules supported.
#
# Example:
# cache_store_log stdio:/var/log/squid/store.log
# cache_store_log daemon:/var/log/squid/store.log
#Default:
# none
# TAG: cache_swap_state
# Location for the cache "swap.state" file. This index file holds
# the metadata of objects saved on disk. It is used to rebuild
# the cache during startup. Normally this file resides in each
# 'cache_dir' directory, but you may specify an alternate
# pathname here. Note you must give a full filename, not just
# a directory. Since this is the index for the whole object
# list you CANNOT periodically rotate it!
#
# If %s can be used in the file name it will be replaced with a
# a representation of the cache_dir name where each / is replaced
# with '.'. This is needed to allow adding/removing cache_dir
# lines when ca