iRule to set SameSite for compatible clients and remove it for incompatible clients (LTM|ASM|APM)

A bunch of us have been refining approaches to help customers handle the new browser enforcement of the HTTP cookie SameSite attribute. I think we have a pretty solid approach now to handle compatib...
Published Feb 11, 2020
Version 1.0
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I think we have a pretty solid approach now to handle compatib...","body@stringLength":"20758","rawBody":"

A bunch of us have been refining approaches to help customers handle the new browser enforcement of the HTTP cookie SameSite attribute.

I think we have a pretty solid approach now to handle compatible and incompatible user-agents.

\n

The iRule:\n

\n

The iRule uses Simon Kowallik's updated string matching logic to handle the incompatible user-agent from Chomium's blog: https://www.chromium.org/updates/same-site/incompatible-clients


Note this iRule only modifies BIG-IP and web application cookies found in Set-Cookie headers. It does not attempt to modify cookies that the BIG-IP or web application sets via Javascript or other methods. BIG-IP ASM is known to set some cookies via Javascript. If you require support for this, please open a case with F5 support (https://support.f5.com) and request your case be added to:

\n

BZ875909: Allow admin configuration of SameSite attribute on ASM system cookies set via Set-Cookie and Javascript


Updates to the iRule can be found in the irules-toolbox repo on GitHub. This specific version is for v12+, but there is a pre-v12 version in the repo as well.


Configuration options in the iRule:

\n

samesite_security: Set this to Strict, Lax or None. The description for these values is in the iRule quoted below:\n

 # Set BIG-IP and app cookies found in Set-Cookie headers using this iRule to:\n #\n # none: Cookies will be sent in both first-party context and cross-origin requests; \n #   however, the value must be explicitly set to None and all browser requests must \n #   follow the HTTPS protocol and include the Secure attribute which requires an encrypted \n #   connection. Cookies that don't adhere to that requirement will be rejected.\n #   Both attributes are required together. If just None is specified without Secure or \n #   if the HTTPS protocol is not used, the third-party cookie will be rejected.\n #\n # lax: Cookies will be sent automatically only in a first-party context and with HTTP GET requests. \n #   SameSite cookies will be withheld on cross-site sub-requests, such as calls to load images or iframes, \n #   but will be sent when a user navigates to the URL from an external site, e.g., by following a link.\n #\n # strict: browser never sends cookies in requests to third party domains\n #\n #   Above definitions from: https://docs.microsoft.com/en-us/microsoftteams/platform/resources/samesite-cookie-update \n #\n # Note: this iRule does not modify cookies set on the client using Javascript or other methods outside of Set-Cookie headers!\n set samesite_security \"none\"\n

\n\n

Uncomment the next command if you're using this iRule on an APM virtual server with an access profile:

 # Uncomment when using this iRule on an APM-enabled virtual server so the MRHSession cookies will be rewritten\n # The iRule cannot be saved on a virtual server with this option uncommented if there is no Access profile also enabled\n #ACCESS::restrict_irule_events disable\n

\n

Now define whether you want to rewrite all web application and BIG-IP cookies found in the Set-Cookie header(s). Set this to 1 to rewrite SameSite on all cookies in Set-Cookie headers. Else, if you want to define specifically named or prefixed cookies, set this option to 0, and proceed to the next two config options, #2 and #3

 # 1. If you want to set SameSite on all BIG-IP and web application cookies for compliant user-agents, set this option to 1\n # Else, if you want to use the next two options for rewriting explicit named cookies or cookie prefixes, set this option to 0\n set set_samesite_on_all 0\n

\n

If you don't want to rewrite all cookies using option #1 above, you can choose to rewrite explicitly named cookies in option #2. Set the exact cookie names in the named_cookie list. Replace MRHSession and LastMRH_Session, which are examples of the cookies APM uses. If you do not want to rewrite exact cookie names, comment out the first example and uncomment the second example \"set named_cookies {}\"

 # 2. Rewrite SameSite on specific named cookies\n #\n # To enable this, list the specific named cookies in the list command and comment out the second set command below\n # To disable this, set this variable to {} and comment out the first set command below\n set named_cookies [list {MRHSession} {LastMRH_Session}]\n #set named_cookies {}\n

\n

If you don't want to rewrite all cookies using option #1 above, you can choose to rewrite cookies using a prefix in option #3. Set the cookie name prefixes in the named_cookie list. Replace BIGipServer and TS, which are examples of the cookie prefixes LTM uses for persistence and ASM uses for session tracking, with the prefixes of the cookie names you want to rewrite. If you do not want to rewrite using cookie name prefixes, comment out the first example and uncomment the second example \"set named_cookies {}\"

 # 3. Rewrite cookies with a prefix like BIG-IP persistence cookies\n # To enable this, list the cookie name prefixes in the list command and comment out the second set command below\n # To disable this, set this variable to {} and comment out the first set command below\n set cookie_prefixes [list {BIGipServer} {TS}]\n #set cookie_prefixes {}\n


If your application or BIG-IP configuration sets cookies in the Set-Cookie headers with SameSite=None, incompatible user-agents will either reject the cookie or treat the cookie as if it was set for SameSite=Strict (https://www.chromium.org/updates/same-site/incompatible-clients).

\n

You can set remove_samesite_for_incompatible_user_agents to 1 to have this iRule remove SameSite attributes from all cookies sent to incompatible browsers.

 # For incompatible user-agents, this iRule can remove the SameSite attribute from all cookies sent to the client via Set-Cookie headers\n # This is only necessary if BIG-IP or the web application being load balanced sets SameSite=None for all clients\n # set to 1 to enable, 0 to disable\n set remove_samesite_for_incompatible_user_agents 1\n

\n

While testing, you can set samesite_debug to 1 to test and get debug written to /var/log/ltm. Make sure to disable this option when you're done testing, before putting the iRule into production!

 # Log debug to /var/log/ltm? 1=yes, 0=no\n # set to 0 after testing\n set samesite_debug 1\n

\nThe full iRule:

(Updates can be found in the irules-toolbox repo on GitHub. This specific version is for v12+, but there is a pre-v12 version in the repo as well.)

# iRule: samesite_cookie_handling\n# author: Simon Kowallik\n# version: 1.3\n#\n# History: version - author - description\n#\t 1.0 - Simon Kowallik - initial version \n#\t 1.1 - Aaron Hooley - updated to add support for setting SameSite to Strict|Lax|None for BIG-IP and app cookies in Set-Cookie headers\n#\t\t\t\t\t\t\t\t\t\t\t- Add option to remove SameSite=None cookies for incompatible browsers\n#\t 1.2 - Aaron Hooley - Added option to rewrite all cookies without naming them explicitly or with prefixes\n#\t 1.3 - Aaron Hooley - set samesite_compatible to 0 by default instead of a null string \n#\n# What the iRule does:\n# Sets SameSite to Strict, Lax or None (and sets Secure when SameSite=None) for compatible user-agents\n# Optionally removes SameSite attribute from all cookies for incompatible user-agents so they'll handle cookies as if they were SameSite=None\n#\n# The iRule should work for:\n# - LTM for web app cookies and persistence cookies, except those that the web app sets via Javascript\n# - ASM for web app cookies and all ASM cookies except those that ASM or the web app sets via Javascript\n# - APM for web app cookies and all APM cookies you configure in the config variable $named_cookies, except those that the web app sets via Javascript\n#\n# The iRule requires BIG-IP v12 or greater to use the HTTP::cookie attribute command\n#\n# RFC \"standards\"\n# https://tools.ietf.org/html/draft-west-cookie-incrementalism-00\n# https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-05\n# further reading:\n# https://web.dev/samesite-cookies-explained/\n# https://web.dev/samesite-cookie-recipes/\n# https://blog.chromium.org/2019/10/developers-get-ready-for-new.html\n# https://www.chromium.org/updates/same-site\n# https://www.chromium.org/updates/same-site/incompatible-clients\n\nproc checkSameSiteCompatible {user_agent} {\n\t# Procedure to check if a user-agent supports SameSite=None on cookies\n\t#\n\t# usage: \n\t#\t\tset isSameSiteCompatible [call checkSameSiteCompatible {User-Agent-String}]\n\t#\n\t# check for incompatible user-agents: https://www.chromium.org/updates/same-site/incompatible-clients\n\t# based on https://devcentral.f5.com/s/articles/HTTP-cookie-SameSite-test-detection-of-browsers-with-incompatible-SameSite-None-handling\n\tswitch -glob -- [set user_agent [string tolower $user_agent]] {\n\t\t{*chrome/5[1-9].[0-9]*} -\n\t\t{*chrome/6[0-6].[0-9]*} -\n\t\t{*chromium/5[1-9].[0-9]*} -\n\t\t{*chromium/6[0-6].[0-9]*} -\n\t\t{*ip?*; cpu *os 12*applewebkit*} -\n\t\t{*macintosh;*mac os x 10_14*version*safari*} -\n\t\t{mozilla*macintosh;*mac os x 10_14*applewebkit*khtml, like gecko*} {\n\t\t\t# no samesite support\n\t\t\treturn 0\n\t\t}\n\t\t{*ucbrowser/*} {\n\t\t\tswitch -glob -- $user_agent {\n\t\t\t\t{*ucbrowser/[1-9].*} -\n\t\t\t\t{*ucbrowser/1[0-1].*} -\n\t\t\t\t{*ucbrowser/12.[0-9].*} -\n\t\t\t\t{*ucbrowser/12.1[0-1].*} -\n\t\t\t\t{*ucbrowser/12.12.*} -\n\t\t\t\t{*ucbrowser/12.13.[0-2]*} {\n\t\t\t\t\t# no samesite support\n\t\t\t\t\treturn 0\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\t# If the current user-agent didn't match any known incompatible browser list, assume it can handle SameSite=None \n\treturn 1\n\n\t# CPU Cycles on Executing (>100k test runs)\n\t#\t Average\t\t\t\t\t\t\t\t 22000-42000 (fastest to slowest path)\n\t#\t Maximum\t\t\t\t\t\t\t\t214263\n\t#\t Minimum\t\t\t\t\t\t\t\t 13763\n}\n\n# the iRule code\nwhen CLIENT_ACCEPTED priority 100 {\n\n\t# Set BIG-IP and app cookies found in Set-Cookie headers using this iRule to:\n\t#\n\t# none: Cookies will be sent in both first-party context and cross-origin requests; \n\t#\t\thowever, the value must be explicitly set to None and all browser requests must \n\t#\t\tfollow the HTTPS protocol and include the Secure attribute which requires an encrypted \n\t#\t\tconnection. Cookies that don't adhere to that requirement will be rejected.\n\t#\t\tBoth attributes are required together. If just None is specified without Secure or \n\t#\t\tif the HTTPS protocol is not used, the third-party cookie will be rejected.\n\t#\n\t# lax: Cookies will be sent automatically only in a first-party context and with HTTP GET requests. \n\t#\t\tSameSite cookies will be withheld on cross-site sub-requests, such as calls to load images or iframes, \n\t#\t\tbut will be sent when a user navigates to the URL from an external site, e.g., by following a link.\n\t#\n\t# strict: browser never sends cookies in requests to third party domains\n\t#\n\t#\t\tAbove definitions from: https://docs.microsoft.com/en-us/microsoftteams/platform/resources/samesite-cookie-update \n\t#\n\t# Note: this iRule does not modify cookies set on the client using Javascript or other methods outside of Set-Cookie headers!\n\tset samesite_security \"none\"\n\n\t# Uncomment when using this iRule on an APM-enabled virtual server so the MRHSession cookies will be rewritten\n\t# The iRule cannot be saved on a virtual server with this option uncommented if there is no Access profile also enabled\n\t#ACCESS::restrict_irule_events disable\n\n\t# 1. If you want to set SameSite on all BIG-IP and web application cookies for compliant user-agents, set this option to 1\n\t# Else, if you want to use the next two options for rewriting explicit named cookies or cookie prefixes, set this option to 0\n\tset set_samesite_on_all 0\n\n\t# 2. Rewrite SameSite on specific named cookies\n\t#\n\t# To enable this, list the specific named cookies in the list command and comment out the second set command below\n\t# To disable this, set this variable to {} and comment out the first set command below\n\tset named_cookies [list {MRHSession} {LastMRH_Session}]\n\t#set named_cookies {}\n\n\t# 3. Rewrite cookies with a prefix like BIG-IP persistence cookies\n\t# To enable this, list the cookie name prefixes in the list command and comment out the second set command below\n\t# To disable this, set this variable to {} and comment out the first set command below\n\tset cookie_prefixes [list {BIGipServer} {TS}]\n\t#set cookie_prefixes {}\n\n\t# For incompatible user-agents, this iRule can remove the SameSite attribute from all cookies sent to the client via Set-Cookie headers\n\t# This is only necessary if BIG-IP or the web application being load balanced sets SameSite=None for all clients\n\t# set to 1 to enable, 0 to disable\n\tset remove_samesite_for_incompatible_user_agents 1\n\n\t# Log debug to /var/log/ltm? 1=yes, 0=no\n\t# set to 0 after testing\n\tset samesite_debug 1\n\n\t# You shouldn't have to make changes to configuration below here\n\n\t# Track the user-agent and whether it supports the SameSite cookie attribute\n\tset samesite_compatible 0\n\tset user_agent {}\n\n\tif { $samesite_debug }{\n\t\tset prefix \"[IP::client_addr]:[TCP::client_port]:\"\n\t\tlog local0. \"$prefix [string repeat \"=\" 40]\"\n\t\tlog local0. \"$prefix \\$samesite_security=$samesite_security; \\$set_samesite_on_all=$set_samesite_on_all; \\$named_cookies=$named_cookies; \\$cookie_prefixes=$cookie_prefixes, \\\n\t\t\t\\$remove_samesite_for_incompatible_user_agents=$remove_samesite_for_incompatible_user_agents\"\n\t}\n}\n\n# Run this test event before any other iRule HTTP_REQUEST events to set the User-Agent header value\n# Comment out this event when done testing user-agents\n#when HTTP_REQUEST priority 2 {\n\n\t# known compatible \n#\tHTTP::header replace user-agent {my compatible user agent string}\n\t# known INcompatible \n#\tHTTP::header replace user-agent {chrome/51.10}\n#}\n\n# Run this iRule before any other iRule HTTP_REQUEST events\nwhen HTTP_REQUEST priority 100 {\n\n\t# If we're setting samesite=none, we need to check the user-agent to see if it's compatible\n\tif { not [string equal -nocase $samesite_security \"none\"] }{\n\n\t\t# Not setting SameSite=None, so exit this event\n\t\treturn\n\t}\n\n\t# Inspect user-agent once per TCP session for higher performance if the user-agent hasn't changed\n\tif { $samesite_compatible == 0 or $user_agent ne [HTTP::header value {User-Agent}]} {\n\t\tset user_agent [HTTP::header value {User-Agent}]\n\t\tset samesite_compatible [call checkSameSiteCompatible $user_agent]\n\t\tif { $samesite_debug }{\n\t\t\tlog local0. \"$prefix Got \\$samesite_compatible=$samesite_compatible and saved current \\$user_agent: $user_agent\"\n\t\t}\n\t}\n}\n# Run this response event with priority 900 after all other iRules to parse the final cookies from the application and BIG-IP\nwhen HTTP_RESPONSE_RELEASE priority 900 {\n\n\t# Log the pre-existing Set-Cookie header values\n\tif { $samesite_debug }{ log local0. \"$prefix Set-Cookie value(s): [HTTP::header values {Set-Cookie}]\" }\n\n\tif { $samesite_compatible } {\n\t\t# user-agent is compatible with SameSite=None, set SameSite on matching cookies\n\n\t\tif { $set_samesite_on_all }{\n\t\t\tif { $samesite_debug }{ log local0. \"$prefix Setting SameSite=$samesite_security on all cookies and exiting\" }\n\t\t\tforeach cookie [HTTP::cookie names] {\n\n\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix Set SameSite=$samesite_security on $cookie\" }\n\n\t\t\t\t# Remove any prior instances of SameSite attributes\n\t\t\t\tHTTP::cookie attribute $cookie remove {samesite} \n\n\t\t\t\t# Insert a new SameSite attribute\n\t\t\t\tHTTP::cookie attribute $cookie insert {samesite} $samesite_security\n\n\t\t\t\t# If samesite attribute is set to None, then the Secure flag must be set for browsers to accept the cookie\n\t\t\t\tif {[string equal -nocase $samesite_security \"none\"]} {\n\t\t\t\t\tHTTP::cookie secure $cookie enable\n\t\t\t\t}\n\t\t\t}\n\t\t\t# Exit this event in this iRule as we've already rewritten all cookies with SameSite\n\t\t\treturn\n\t\t}\n\t\t# Match named cookies exactly\n\t\tif { $named_cookies ne {} }{\n\t\t\tforeach cookie $named_cookies {\n\t\t\t\tif { [HTTP::cookie exists $cookie] } {\n\t\t\t\t\t# Remove any pre-existing SameSite attributes from this cookie as most clients use the most strict value if multiple instances are set\n\t\t\t\t\tHTTP::cookie attribute $cookie remove {SameSite}\n\n\t\t\t\t\t# Insert the SameSite attribute\n\t\t\t\t\tHTTP::cookie attribute $cookie insert {SameSite} $samesite_security\n\n\t\t\t\t\t# If samesite attribute is set to None, then the Secure flag must be set for browsers to accept the cookie\n\t\t\t\t\tif {[string equal -nocase $samesite_security \"none\"]} {\n\t\t\t\t\t\tHTTP::cookie secure $cookie enable\n\t\t\t\t\t}\n\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix Matched explicitly named cookie $cookie, set SameSite=$samesite_security\" }\n\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix \" }\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\t# Match a cookie prefix (cookie name starts with a prefix from the $cookie_prefixes list)\n\t\tif { $cookie_prefixes ne {} }{\n\t\t\tforeach cookie [HTTP::cookie names] {\n\t\t\t\tforeach cookie_prefix $cookie_prefixes {\n\t\t\t\t\tif { $cookie starts_with $cookie_prefix } {\n\t\t\t\t\t\t# Remove any pre-existing SameSite attributes from this cookie as most clients use the most strict value if multiple instances are set\n\t\t\t\t\t\tHTTP::cookie attribute $cookie remove {SameSite}\n\n\t\t\t\t\t\t# Insert the SameSite attribute\n\t\t\t\t\t\tHTTP::cookie attribute $cookie insert {SameSite} $samesite_security\n\n\t\t\t\t\t\t# If samesite attribute is set to None, then the Secure flag must be set for browsers to accept the cookie\n\t\t\t\t\t\tif { [string equal -nocase $samesite_security \"none\"] } {\n\t\t\t\t\t\t\tHTTP::cookie secure $cookie enable\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix Matched prefixed cookie $cookie, with prefix $cookie_prefix, set SameSite=$samesite_security, breaking from loop\" }\n\t\t\t\t\t\tbreak\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t} else {\n\n\t\t# User-agent can't handle SameSite=None\n\n\t\tif { $remove_samesite_for_incompatible_user_agents }{\n\n\t\t\t# User-agent can't handle SameSite=None, so remove SameSite attribute from all cookies if SameSite=None\n\t\t\t# This will use CPU cycles on BIG-IP so only enable it if you know BIG-IP or the web application is setting \n\t\t\t# SameSite=None for all clients including incompatible ones\n\t\t\tforeach cookie [HTTP::cookie names] {\n\t\t\t\tif { [string tolower [HTTP::cookie attribute $cookie value SameSite]] eq \"none\" }{\n\t\t\t\t\tHTTP::cookie attribute $cookie remove SameSite\n\t\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix Removing SameSite for incompatible client from cookie=$cookie\" }\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\t# Log the modified Set-Cookie header values\n\tif { $samesite_debug }{ log local0. \"$prefix Final Set-Cookies: [HTTP::header values {Set-Cookie}]\" }\n}\n
","kudosSumWeight":9,"postTime":"2020-02-10T20:19:53.000-08:00","images":{"__typename":"AssociatedImageConnection","edges":[],"totalCount":0,"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}},"attachments":{"__typename":"AttachmentConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"tags":{"__typename":"TagConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[{"__typename":"TagEdge","cursor":"MjQuMTF8Mi4xfG98MTB8X05WX3wx","node":{"__typename":"Tag","id":"tag:application delivery","text":"application delivery","time":"2021-06-30T01:48:44.000-07:00","lastActivityTime":null,"messagesCount":null,"followersCount":null}},{"__typename":"TagEdge","cursor":"MjQuMTF8Mi4xfG98MTB8X05WX3wy","node":{"__typename":"Tag","id":"tag:iRules","text":"iRules","time":"2022-01-24T02:29:45.106-08:00","lastActivityTime":null,"messagesCount":null,"followersCount":null}},{"__typename":"TagEdge","cursor":"MjQuMTF8Mi4xfG98MTB8X05WX3wz","node":{"__typename":"Tag","id":"tag:samesite","text":"samesite","time":"2022-01-24T02:29:54.982-08:00","lastActivityTime":null,"messagesCount":null,"followersCount":null}}]},"timeToRead":11,"rawTeaser":"","introduction":"","currentRevision":{"__ref":"Revision:revision:278650_1"},"latestVersion":{"__typename":"FriendlyVersion","major":"1","minor":"0"},"metrics":{"__typename":"MessageMetrics","views":13924},"visibilityScope":"PUBLIC","canonicalUrl":null,"seoTitle":null,"seoDescription":null,"placeholder":false,"originalMessageForPlaceholder":null,"contributors":{"__typename":"UserConnection","edges":[]},"nonCoAuthorContributors":{"__typename":"UserConnection","edges":[]},"coAuthors":{"__typename":"UserConnection","edges":[{"__typename":"UserEdge","node":{"__ref":"User:user:72543"}}]},"tkbMessagePolicies":{"__typename":"TkbMessagePolicies","canDoAuthoringActionsOnTkb":{"__typename":"PolicyResult","failureReason":{"__typename":"FailureReason","message":"error.lithium.policies.tkb.policy_can_do_authoring_action.accessDenied","key":"error.lithium.policies.tkb.policy_can_do_authoring_action.accessDenied","args":[]}}},"archivalData":null,"customFields":[],"revisions({\"constraints\":{\"isPublished\":{\"eq\":true}},\"first\":1})":{"__typename":"RevisionConnection","totalCount":1},"body":"

A bunch of us have been refining approaches to help customers handle the new browser enforcement of the HTTP cookie SameSite attribute.

I think we have a pretty solid approach now to handle compatible and incompatible user-agents.

\n

The iRule:\n

\n

The iRule uses Simon Kowallik's updated string matching logic to handle the incompatible user-agent from Chomium's blog: https://www.chromium.org/updates/same-site/incompatible-clients


Note this iRule only modifies BIG-IP and web application cookies found in Set-Cookie headers. It does not attempt to modify cookies that the BIG-IP or web application sets via Javascript or other methods. BIG-IP ASM is known to set some cookies via Javascript. If you require support for this, please open a case with F5 support (https://support.f5.com) and request your case be added to:

\n

BZ875909: Allow admin configuration of SameSite attribute on ASM system cookies set via Set-Cookie and Javascript


Updates to the iRule can be found in the irules-toolbox repo on GitHub. This specific version is for v12+, but there is a pre-v12 version in the repo as well.


Configuration options in the iRule:

\n

samesite_security: Set this to Strict, Lax or None. The description for these values is in the iRule quoted below:\n

 # Set BIG-IP and app cookies found in Set-Cookie headers using this iRule to:\n #\n # none: Cookies will be sent in both first-party context and cross-origin requests; \n #   however, the value must be explicitly set to None and all browser requests must \n #   follow the HTTPS protocol and include the Secure attribute which requires an encrypted \n #   connection. Cookies that don't adhere to that requirement will be rejected.\n #   Both attributes are required together. If just None is specified without Secure or \n #   if the HTTPS protocol is not used, the third-party cookie will be rejected.\n #\n # lax: Cookies will be sent automatically only in a first-party context and with HTTP GET requests. \n #   SameSite cookies will be withheld on cross-site sub-requests, such as calls to load images or iframes, \n #   but will be sent when a user navigates to the URL from an external site, e.g., by following a link.\n #\n # strict: browser never sends cookies in requests to third party domains\n #\n #   Above definitions from: https://docs.microsoft.com/en-us/microsoftteams/platform/resources/samesite-cookie-update \n #\n # Note: this iRule does not modify cookies set on the client using Javascript or other methods outside of Set-Cookie headers!\n set samesite_security \"none\"\n

\n\n

Uncomment the next command if you're using this iRule on an APM virtual server with an access profile:

 # Uncomment when using this iRule on an APM-enabled virtual server so the MRHSession cookies will be rewritten\n # The iRule cannot be saved on a virtual server with this option uncommented if there is no Access profile also enabled\n #ACCESS::restrict_irule_events disable\n

\n

Now define whether you want to rewrite all web application and BIG-IP cookies found in the Set-Cookie header(s). Set this to 1 to rewrite SameSite on all cookies in Set-Cookie headers. Else, if you want to define specifically named or prefixed cookies, set this option to 0, and proceed to the next two config options, #2 and #3

 # 1. If you want to set SameSite on all BIG-IP and web application cookies for compliant user-agents, set this option to 1\n # Else, if you want to use the next two options for rewriting explicit named cookies or cookie prefixes, set this option to 0\n set set_samesite_on_all 0\n

\n

If you don't want to rewrite all cookies using option #1 above, you can choose to rewrite explicitly named cookies in option #2. Set the exact cookie names in the named_cookie list. Replace MRHSession and LastMRH_Session, which are examples of the cookies APM uses. If you do not want to rewrite exact cookie names, comment out the first example and uncomment the second example \"set named_cookies {}\"

 # 2. Rewrite SameSite on specific named cookies\n #\n # To enable this, list the specific named cookies in the list command and comment out the second set command below\n # To disable this, set this variable to {} and comment out the first set command below\n set named_cookies [list {MRHSession} {LastMRH_Session}]\n #set named_cookies {}\n

\n

If you don't want to rewrite all cookies using option #1 above, you can choose to rewrite cookies using a prefix in option #3. Set the cookie name prefixes in the named_cookie list. Replace BIGipServer and TS, which are examples of the cookie prefixes LTM uses for persistence and ASM uses for session tracking, with the prefixes of the cookie names you want to rewrite. If you do not want to rewrite using cookie name prefixes, comment out the first example and uncomment the second example \"set named_cookies {}\"

 # 3. Rewrite cookies with a prefix like BIG-IP persistence cookies\n # To enable this, list the cookie name prefixes in the list command and comment out the second set command below\n # To disable this, set this variable to {} and comment out the first set command below\n set cookie_prefixes [list {BIGipServer} {TS}]\n #set cookie_prefixes {}\n


If your application or BIG-IP configuration sets cookies in the Set-Cookie headers with SameSite=None, incompatible user-agents will either reject the cookie or treat the cookie as if it was set for SameSite=Strict (https://www.chromium.org/updates/same-site/incompatible-clients).

\n

You can set remove_samesite_for_incompatible_user_agents to 1 to have this iRule remove SameSite attributes from all cookies sent to incompatible browsers.

 # For incompatible user-agents, this iRule can remove the SameSite attribute from all cookies sent to the client via Set-Cookie headers\n # This is only necessary if BIG-IP or the web application being load balanced sets SameSite=None for all clients\n # set to 1 to enable, 0 to disable\n set remove_samesite_for_incompatible_user_agents 1\n

\n

While testing, you can set samesite_debug to 1 to test and get debug written to /var/log/ltm. Make sure to disable this option when you're done testing, before putting the iRule into production!

 # Log debug to /var/log/ltm? 1=yes, 0=no\n # set to 0 after testing\n set samesite_debug 1\n

\nThe full iRule:

(Updates can be found in the irules-toolbox repo on GitHub. This specific version is for v12+, but there is a pre-v12 version in the repo as well.)

# iRule: samesite_cookie_handling\n# author: Simon Kowallik\n# version: 1.3\n#\n# History: version - author - description\n#\t 1.0 - Simon Kowallik - initial version \n#\t 1.1 - Aaron Hooley - updated to add support for setting SameSite to Strict|Lax|None for BIG-IP and app cookies in Set-Cookie headers\n#\t\t\t\t\t\t\t\t\t\t\t- Add option to remove SameSite=None cookies for incompatible browsers\n#\t 1.2 - Aaron Hooley - Added option to rewrite all cookies without naming them explicitly or with prefixes\n#\t 1.3 - Aaron Hooley - set samesite_compatible to 0 by default instead of a null string \n#\n# What the iRule does:\n# Sets SameSite to Strict, Lax or None (and sets Secure when SameSite=None) for compatible user-agents\n# Optionally removes SameSite attribute from all cookies for incompatible user-agents so they'll handle cookies as if they were SameSite=None\n#\n# The iRule should work for:\n# - LTM for web app cookies and persistence cookies, except those that the web app sets via Javascript\n# - ASM for web app cookies and all ASM cookies except those that ASM or the web app sets via Javascript\n# - APM for web app cookies and all APM cookies you configure in the config variable $named_cookies, except those that the web app sets via Javascript\n#\n# The iRule requires BIG-IP v12 or greater to use the HTTP::cookie attribute command\n#\n# RFC \"standards\"\n# https://tools.ietf.org/html/draft-west-cookie-incrementalism-00\n# https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-05\n# further reading:\n# https://web.dev/samesite-cookies-explained/\n# https://web.dev/samesite-cookie-recipes/\n# https://blog.chromium.org/2019/10/developers-get-ready-for-new.html\n# https://www.chromium.org/updates/same-site\n# https://www.chromium.org/updates/same-site/incompatible-clients\n\nproc checkSameSiteCompatible {user_agent} {\n\t# Procedure to check if a user-agent supports SameSite=None on cookies\n\t#\n\t# usage: \n\t#\t\tset isSameSiteCompatible [call checkSameSiteCompatible {User-Agent-String}]\n\t#\n\t# check for incompatible user-agents: https://www.chromium.org/updates/same-site/incompatible-clients\n\t# based on https://devcentral.f5.com/s/articles/HTTP-cookie-SameSite-test-detection-of-browsers-with-incompatible-SameSite-None-handling\n\tswitch -glob -- [set user_agent [string tolower $user_agent]] {\n\t\t{*chrome/5[1-9].[0-9]*} -\n\t\t{*chrome/6[0-6].[0-9]*} -\n\t\t{*chromium/5[1-9].[0-9]*} -\n\t\t{*chromium/6[0-6].[0-9]*} -\n\t\t{*ip?*; cpu *os 12*applewebkit*} -\n\t\t{*macintosh;*mac os x 10_14*version*safari*} -\n\t\t{mozilla*macintosh;*mac os x 10_14*applewebkit*khtml, like gecko*} {\n\t\t\t# no samesite support\n\t\t\treturn 0\n\t\t}\n\t\t{*ucbrowser/*} {\n\t\t\tswitch -glob -- $user_agent {\n\t\t\t\t{*ucbrowser/[1-9].*} -\n\t\t\t\t{*ucbrowser/1[0-1].*} -\n\t\t\t\t{*ucbrowser/12.[0-9].*} -\n\t\t\t\t{*ucbrowser/12.1[0-1].*} -\n\t\t\t\t{*ucbrowser/12.12.*} -\n\t\t\t\t{*ucbrowser/12.13.[0-2]*} {\n\t\t\t\t\t# no samesite support\n\t\t\t\t\treturn 0\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\t# If the current user-agent didn't match any known incompatible browser list, assume it can handle SameSite=None \n\treturn 1\n\n\t# CPU Cycles on Executing (>100k test runs)\n\t#\t Average\t\t\t\t\t\t\t\t 22000-42000 (fastest to slowest path)\n\t#\t Maximum\t\t\t\t\t\t\t\t214263\n\t#\t Minimum\t\t\t\t\t\t\t\t 13763\n}\n\n# the iRule code\nwhen CLIENT_ACCEPTED priority 100 {\n\n\t# Set BIG-IP and app cookies found in Set-Cookie headers using this iRule to:\n\t#\n\t# none: Cookies will be sent in both first-party context and cross-origin requests; \n\t#\t\thowever, the value must be explicitly set to None and all browser requests must \n\t#\t\tfollow the HTTPS protocol and include the Secure attribute which requires an encrypted \n\t#\t\tconnection. Cookies that don't adhere to that requirement will be rejected.\n\t#\t\tBoth attributes are required together. If just None is specified without Secure or \n\t#\t\tif the HTTPS protocol is not used, the third-party cookie will be rejected.\n\t#\n\t# lax: Cookies will be sent automatically only in a first-party context and with HTTP GET requests. \n\t#\t\tSameSite cookies will be withheld on cross-site sub-requests, such as calls to load images or iframes, \n\t#\t\tbut will be sent when a user navigates to the URL from an external site, e.g., by following a link.\n\t#\n\t# strict: browser never sends cookies in requests to third party domains\n\t#\n\t#\t\tAbove definitions from: https://docs.microsoft.com/en-us/microsoftteams/platform/resources/samesite-cookie-update \n\t#\n\t# Note: this iRule does not modify cookies set on the client using Javascript or other methods outside of Set-Cookie headers!\n\tset samesite_security \"none\"\n\n\t# Uncomment when using this iRule on an APM-enabled virtual server so the MRHSession cookies will be rewritten\n\t# The iRule cannot be saved on a virtual server with this option uncommented if there is no Access profile also enabled\n\t#ACCESS::restrict_irule_events disable\n\n\t# 1. If you want to set SameSite on all BIG-IP and web application cookies for compliant user-agents, set this option to 1\n\t# Else, if you want to use the next two options for rewriting explicit named cookies or cookie prefixes, set this option to 0\n\tset set_samesite_on_all 0\n\n\t# 2. Rewrite SameSite on specific named cookies\n\t#\n\t# To enable this, list the specific named cookies in the list command and comment out the second set command below\n\t# To disable this, set this variable to {} and comment out the first set command below\n\tset named_cookies [list {MRHSession} {LastMRH_Session}]\n\t#set named_cookies {}\n\n\t# 3. Rewrite cookies with a prefix like BIG-IP persistence cookies\n\t# To enable this, list the cookie name prefixes in the list command and comment out the second set command below\n\t# To disable this, set this variable to {} and comment out the first set command below\n\tset cookie_prefixes [list {BIGipServer} {TS}]\n\t#set cookie_prefixes {}\n\n\t# For incompatible user-agents, this iRule can remove the SameSite attribute from all cookies sent to the client via Set-Cookie headers\n\t# This is only necessary if BIG-IP or the web application being load balanced sets SameSite=None for all clients\n\t# set to 1 to enable, 0 to disable\n\tset remove_samesite_for_incompatible_user_agents 1\n\n\t# Log debug to /var/log/ltm? 1=yes, 0=no\n\t# set to 0 after testing\n\tset samesite_debug 1\n\n\t# You shouldn't have to make changes to configuration below here\n\n\t# Track the user-agent and whether it supports the SameSite cookie attribute\n\tset samesite_compatible 0\n\tset user_agent {}\n\n\tif { $samesite_debug }{\n\t\tset prefix \"[IP::client_addr]:[TCP::client_port]:\"\n\t\tlog local0. \"$prefix [string repeat \"=\" 40]\"\n\t\tlog local0. \"$prefix \\$samesite_security=$samesite_security; \\$set_samesite_on_all=$set_samesite_on_all; \\$named_cookies=$named_cookies; \\$cookie_prefixes=$cookie_prefixes, \\\n\t\t\t\\$remove_samesite_for_incompatible_user_agents=$remove_samesite_for_incompatible_user_agents\"\n\t}\n}\n\n# Run this test event before any other iRule HTTP_REQUEST events to set the User-Agent header value\n# Comment out this event when done testing user-agents\n#when HTTP_REQUEST priority 2 {\n\n\t# known compatible \n#\tHTTP::header replace user-agent {my compatible user agent string}\n\t# known INcompatible \n#\tHTTP::header replace user-agent {chrome/51.10}\n#}\n\n# Run this iRule before any other iRule HTTP_REQUEST events\nwhen HTTP_REQUEST priority 100 {\n\n\t# If we're setting samesite=none, we need to check the user-agent to see if it's compatible\n\tif { not [string equal -nocase $samesite_security \"none\"] }{\n\n\t\t# Not setting SameSite=None, so exit this event\n\t\treturn\n\t}\n\n\t# Inspect user-agent once per TCP session for higher performance if the user-agent hasn't changed\n\tif { $samesite_compatible == 0 or $user_agent ne [HTTP::header value {User-Agent}]} {\n\t\tset user_agent [HTTP::header value {User-Agent}]\n\t\tset samesite_compatible [call checkSameSiteCompatible $user_agent]\n\t\tif { $samesite_debug }{\n\t\t\tlog local0. \"$prefix Got \\$samesite_compatible=$samesite_compatible and saved current \\$user_agent: $user_agent\"\n\t\t}\n\t}\n}\n# Run this response event with priority 900 after all other iRules to parse the final cookies from the application and BIG-IP\nwhen HTTP_RESPONSE_RELEASE priority 900 {\n\n\t# Log the pre-existing Set-Cookie header values\n\tif { $samesite_debug }{ log local0. \"$prefix Set-Cookie value(s): [HTTP::header values {Set-Cookie}]\" }\n\n\tif { $samesite_compatible } {\n\t\t# user-agent is compatible with SameSite=None, set SameSite on matching cookies\n\n\t\tif { $set_samesite_on_all }{\n\t\t\tif { $samesite_debug }{ log local0. \"$prefix Setting SameSite=$samesite_security on all cookies and exiting\" }\n\t\t\tforeach cookie [HTTP::cookie names] {\n\n\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix Set SameSite=$samesite_security on $cookie\" }\n\n\t\t\t\t# Remove any prior instances of SameSite attributes\n\t\t\t\tHTTP::cookie attribute $cookie remove {samesite} \n\n\t\t\t\t# Insert a new SameSite attribute\n\t\t\t\tHTTP::cookie attribute $cookie insert {samesite} $samesite_security\n\n\t\t\t\t# If samesite attribute is set to None, then the Secure flag must be set for browsers to accept the cookie\n\t\t\t\tif {[string equal -nocase $samesite_security \"none\"]} {\n\t\t\t\t\tHTTP::cookie secure $cookie enable\n\t\t\t\t}\n\t\t\t}\n\t\t\t# Exit this event in this iRule as we've already rewritten all cookies with SameSite\n\t\t\treturn\n\t\t}\n\t\t# Match named cookies exactly\n\t\tif { $named_cookies ne {} }{\n\t\t\tforeach cookie $named_cookies {\n\t\t\t\tif { [HTTP::cookie exists $cookie] } {\n\t\t\t\t\t# Remove any pre-existing SameSite attributes from this cookie as most clients use the most strict value if multiple instances are set\n\t\t\t\t\tHTTP::cookie attribute $cookie remove {SameSite}\n\n\t\t\t\t\t# Insert the SameSite attribute\n\t\t\t\t\tHTTP::cookie attribute $cookie insert {SameSite} $samesite_security\n\n\t\t\t\t\t# If samesite attribute is set to None, then the Secure flag must be set for browsers to accept the cookie\n\t\t\t\t\tif {[string equal -nocase $samesite_security \"none\"]} {\n\t\t\t\t\t\tHTTP::cookie secure $cookie enable\n\t\t\t\t\t}\n\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix Matched explicitly named cookie $cookie, set SameSite=$samesite_security\" }\n\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix \" }\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\t# Match a cookie prefix (cookie name starts with a prefix from the $cookie_prefixes list)\n\t\tif { $cookie_prefixes ne {} }{\n\t\t\tforeach cookie [HTTP::cookie names] {\n\t\t\t\tforeach cookie_prefix $cookie_prefixes {\n\t\t\t\t\tif { $cookie starts_with $cookie_prefix } {\n\t\t\t\t\t\t# Remove any pre-existing SameSite attributes from this cookie as most clients use the most strict value if multiple instances are set\n\t\t\t\t\t\tHTTP::cookie attribute $cookie remove {SameSite}\n\n\t\t\t\t\t\t# Insert the SameSite attribute\n\t\t\t\t\t\tHTTP::cookie attribute $cookie insert {SameSite} $samesite_security\n\n\t\t\t\t\t\t# If samesite attribute is set to None, then the Secure flag must be set for browsers to accept the cookie\n\t\t\t\t\t\tif { [string equal -nocase $samesite_security \"none\"] } {\n\t\t\t\t\t\t\tHTTP::cookie secure $cookie enable\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix Matched prefixed cookie $cookie, with prefix $cookie_prefix, set SameSite=$samesite_security, breaking from loop\" }\n\t\t\t\t\t\tbreak\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t} else {\n\n\t\t# User-agent can't handle SameSite=None\n\n\t\tif { $remove_samesite_for_incompatible_user_agents }{\n\n\t\t\t# User-agent can't handle SameSite=None, so remove SameSite attribute from all cookies if SameSite=None\n\t\t\t# This will use CPU cycles on BIG-IP so only enable it if you know BIG-IP or the web application is setting \n\t\t\t# SameSite=None for all clients including incompatible ones\n\t\t\tforeach cookie [HTTP::cookie names] {\n\t\t\t\tif { [string tolower [HTTP::cookie attribute $cookie value SameSite]] eq \"none\" }{\n\t\t\t\t\tHTTP::cookie attribute $cookie remove SameSite\n\t\t\t\t\tif { $samesite_debug }{ log local0. \"$prefix Removing SameSite for incompatible client from cookie=$cookie\" }\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\t# Log the modified Set-Cookie header values\n\tif { $samesite_debug }{ log local0. \"$prefix Final Set-Cookies: [HTTP::header values {Set-Cookie}]\" }\n}\n
"},"Conversation:conversation:278650":{"__typename":"Conversation","id":"conversation:278650","solved":false,"topic":{"__ref":"TkbTopicMessage:message:278650"},"lastPostingActivityTime":"2022-01-16T11:35:11.000-08:00","lastPostTime":"2022-01-16T11:35:11.000-08:00","unreadReplyCount":21,"isSubscribed":false},"ModerationData:moderation_data:278650":{"__typename":"ModerationData","id":"moderation_data:278650","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"Revision:revision:278650_1":{"__typename":"Revision","id":"revision:278650_1","lastEditTime":"2020-02-10T20:19:53.000-08:00"},"TkbReplyMessage:message:278665":{"__typename":"TkbReplyMessage","id":"message:278665","conversation":{"__ref":"Conversation:conversation:278650"},"author":{"__ref":"User:user:72543"},"revisionNum":3,"uid":278665,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Tkb:board:TechnicalArticles"},"subject":"Re: iRule to set SameSite for compatible clients and remove it for incompatible clients (LTM|ASM|APM)","readOnly":false,"editFrozen":false,"moderationData":{"__ref":"ModerationData:moderation_data:278665"},"parent":{"__ref":"TkbTopicMessage:message:278650"},"body":"

Thanks for your replies  and . Could you add this line to the samesite iRule just after the HTTP_RESPONSE_RELEASE line?

Look for this line (line 188 in https://github.com/f5devcentral/irules-toolbox/blob/master/security/http/cookies/samesite-attributes.tcl😞

# Run this response event with priority 900 after all other iRules to parse the final cookies from the application and BIG-IP\nwhen HTTP_RESPONSE_RELEASE priority 900 {

And add this return command after it, as listed below:

# Exit this event if another iRule has already sent an HTTP response (F5 article K23237429)\nif {[HTTP::has_responded]}{return}

Please test this on a separate non-production virtual server or during a maintenance window in case there are any issues.

Thanks, Aaron

","body@stringLength":"1205","rawBody":"

Thanks for your replies  and . Could you add this line to the samesite iRule just after the HTTP_RESPONSE_RELEASE line?

Look for this line (line 188 in https://github.com/f5devcentral/irules-toolbox/blob/master/security/http/cookies/samesite-attributes.tcl😞

# Run this response event with priority 900 after all other iRules to parse the final cookies from the application and BIG-IP\nwhen HTTP_RESPONSE_RELEASE priority 900 {

And add this return command after it, as listed below:

# Exit this event if another iRule has already sent an HTTP response (F5 article K23237429)\nif {[HTTP::has_responded]}{return}

Please test this on a separate non-production virtual server or during a maintenance window in case there are any issues.

Thanks, Aaron

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