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Hoolio
F5 Employee
F5 Employee

See this updated article for an example of how to use the logic from this article on matching user-agents that don't support SameSite=None on cookies and use it to remove the SameSite attribute from responses to those incompatible clients. This allows the incompatible user-agents to accept the cookies and send them to third party sites as normal.


https://devcentral.f5.com/s/articles/iRule-to-set-SameSite-for-compatible-clients-and-remove-it-for-...




========================================================


With the coming enforcement of the SameSite cookie attribute by browsers like Chrome v80, we want to test iRule logic we can use to detect older browsers that cannot accept cookies with SameSite=None set. This logic can be incorporated into other iRules which set the SameSite to None so the incompatible browsers can be handled specially.


For more context, you can review these resources:


Lightboard Lessons: HTTP Cookie SameSite Attribute from Jason Rahm

Set the SameSite Cookie Attribute for Web Application and BIG-IP Module Cookies

Set the SameSite Attribute for LTM Persistence Cookies

Add SameSite attribute to APM Cookies



We test based on the logic outlined on the Chromium page:


https://www.chromium.org/updates/same-site/incompatible-clients


  • Versions of Chrome from Chrome 51 to Chrome 66 (inclusive on both ends). These Chrome versions will reject a cookie with `SameSite=None`. This also affects older versions of Chromium-derived browsers, as well as Android WebView. This behavior was correct according to the version of the cookie specification at that time, but with the addition of the new "None" value to the specification, this behavior has been updated in Chrome 67 and newer. (Prior to Chrome 51, the SameSite attribute was ignored entirely and all cookies were treated as if they were `SameSite=None`.)
  • Versions of UC Browser on Android prior to version 12.13.2. Older versions will reject a cookie with `SameSite=None`. This behavior was correct according to the version of the cookie specification at that time, but with the addition of the new "None" value to the specification, this behavior has been updated in newer versions of UC Browser.
  • Versions of Safari and embedded browsers on MacOS 10.14 and all browsers on iOS 12. These versions will erroneously treat cookies marked with `SameSite=None` as if they were marked `SameSite=Strict`. This bug has been fixed on newer versions of iOS and MacOS.


We (ab)use the RULE_INIT event in an iRule to test logic using a switch statement to check a list of example user-agent strings.


This will probably evolve as we learn more about how SameSite impacts applications and browsers. Please reply below with any feedback or improvements you can suggest.


Aaron


when RULE_INIT {


	# Simple iRule to test parsing the User-Agent header to identify browsers that don't support SameSite=None
	# Most incompatible browsers can be identified by string matches (chrome, chromium, safari, etc)
	# For UC Browser we need to check if the version is equal to or greater than 12.13.2
	# 
	# We abuse RULE_INIT to run the iRule code and not deal with generating traffic to a virtual server
	# We skip using static:: namespace for variables, as this isn't going to be used in production on a virtual server.

	# Only run this on the first TMM so we get a single set of logs per test
	if { not ([TMM::cmp_unit] == 0 && [TMM::cmp_group] == 0)}{ return }

	# Create a list of user-agent strings to test the iRule logic

	# UC Browser user-agent test strings
	# from: https://developers.whatismybrowser.com/useragents/explore/software_name/uc-browser/
	set uas [list \
		{Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/12.13.10.944 Mobile Safari/537.36} \
		{Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/12.14.10.944 Mobile Safari/537.36} \
		{Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/13.14.10.944 Mobile Safari/537.36} \
		{Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/11.5.1.944 Mobile Safari/537.36} \
		{Mozilla/5.0 (Linux; U; Android 4.4.2; zh-CN; HUAWEI MT7-TL00 Build/HuaweiMT7-TL00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/11.3.8.909 Mobile Safari/537.36} \
		{Mozilla/5.0 (Linux; U; Android 8.1.0; zh-CN; EML-AL00 Build/HUAWEIEML-AL00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.108 baidu.sogo.uc.UCBrowser/11.9.4.974 UWS/2.13.1.48 Mobile Safari/537.36 AliApp(DingTalk/4.5.11) com.alibaba.android.rimet/10487439 Channel/227200 language/zh-CN} \
		{Mozilla/5.0 (X11; U; Linux i686; en-US) U2/1.0.0 UCBrowser/9.3.1.344} \
		{Mozilla/5.0(Linux;U;Android 5.1.1;zh-CN;OPPO A33 Build/LMY47V) AppleWebKit/537.36(KHTML,like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/11.7.0.953 Mobile Safari/537.36} \
		{UCWEB/2.0 (Java; U; MIDP-2.0; Nokia203/20.37) U2/1.0.0 UCBrowser/8.7.0.218 U2/1.0.0 Mobile} \
	]
	# Chrome user-agent test strings
	# from: https://developers.whatismybrowser.com/useragents/explore/software_name/chrome/
	lappend uas {Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36} \
		{Mozilla/5.0 (Linux; Android 6.0.1; RedMi Note 5 Build/RB3N5C; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36} \
		{Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36} \
		{Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36} \
		{Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.157 Safari/537.36} \
		{Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36} \
		{Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36 }


	# Chromium user-agent test strings
	# from: https://developers.whatismybrowser.com/useragents/explore/software_name/chromium/
	lappend uas {Mozilla/5.0 (Linux; Ubuntu 14.04) AppleWebKit/537.36 Chromium/35.0.1870.2 Safari/537.36} \
		{Mozilla/5.0 (Linux; Ubuntu 14.04 like Android 4.4) AppleWebKit/537.36 Chromium/35.0.1870.2 Mobile Safari/537.36} \
		{Mozilla/5.0 (SMART-TV; X11; Linux armv7l) AppleWebKit/537.42 (KHTML, like Gecko) Chromium/25.0.1349.2 Chrome/25.0.1349.2 Safari/537.42} \
		{Mozilla/5.0 (Linux; Ubuntu 15.04 like Android 4.4) AppleWebKit/537.36 Chromium/53.0.2785.143 Mobile Safari/537.36} \
		{Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.30 (KHTML, like Gecko) Ubuntu/11.04 Chromium/12.0.742.112 Chrome/12.0.742.112 Safari/534.30} \
		{Mozilla/5.0 (X11; Linux i686) AppleWebKit/534.30 (KHTML, like Gecko) Ubuntu/10.10 Chromium/12.0.742.112 Chrome/12.0.742.112 Safari/534.30} \
		{Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.30 (KHTML, like Gecko) Ubuntu/10.10 Chromium/12.0.742.112 Chrome/12.0.742.112 Safari/534.30} \


	log local0. "\$uas ([llength $uas]): $uas"


	# Loop through each sample user-agent
	foreach ua $uas {


		log local0. "[string repeat "=" 40]"
		log local0. "Checking: $ua"



		#
		# This is the code we're actually testing that could be used in another iRule
		#
		switch -glob [string tolower $ua] {
			{*chrome/5[1-9].[0-9]*} -
			{*chrome/6[0-6].[0-9]*} -
			{*ip?*; cpu *os 12*applewebkit*} -
			{*macintosh;*mac os x 10_14*version*safari*} -
			{mozilla*macintosh;*mac os x 10_14*applewebkit*khtml, like gecko*} -
			{*chromium/5[1-9].[0-9]*} -
			{*chromium/6[0-6].[0-9]*} {
				log local0. "Matched incompatible user-agent in the switch statement for $ua"
				set browser_can_handle_samesite_none 0
			}
			{*ucbrowser/*} {
				# For UCBrowser parsing, assume compatible and then remove the incompatible versions
				set browser_can_handle_samesite_none 1
				log local0. ""


				# Split the UA string on ucbrowser/
				set ua [getfield [string tolower $ua] "ucbrowser/" 2]


				log local0. "\$ua: $ua"
				# Get the first three sets of the version number
				if {[scan $ua {%d.%d.%d} v1 v2 v3] == 3}{
			
					log local0. "scanned: $v1, $v2, $v3"
			
					# Check if the version string is higher than 12.13.2
					if {$v1 < 12}{
						log local0. "\$v1 < 12"
						set browser_can_handle_samesite_none 0
					}  elseif {$v1 == 12 && $v2 < 13}{
						# 12.y.z
						log local0. "\$v1 == 12 and \$v2 < 13"
						set browser_can_handle_samesite_none 0
					} elseif {$v2==13 && $v3 < 2}{
						# 12.13.z
						log local0. "\$v2 == 13 and \$v3 < 2"
						set browser_can_handle_samesite_none 0
					}
				}
				log local0. "\$browser_can_handle_samesite_none = $browser_can_handle_samesite_none"
			}
			default {
				log local0. "No match for this user-agent string"
			}
		}
		#
		# This is the end of the code we're actually testing that could be used in another iRule
		# After detecting user-agents that don't support SameSite=None in HTTP_REQUEST
		#  you can check for $$browser_can_handle_samesite_none=1 in a response event like HTTP_RESPONSE_RELEASE
	}
}



Here is the log output from /var/log/ltm:


: $uas (23): {Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/12.13.10.944 Mobile Safari/537.36} {Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/12.14.10.944 Mobile Safari/537.36} {Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/13.14.10.944 Mobile Safari/537.36} {Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/11.5.1.944 Mobile Safari/537.36} {Mozilla/5.0 (Linux; U; Android 4.4.2; zh-CN; HUAWEI MT7-TL00 Build/HuaweiMT7-TL00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 U
: ========================================
: Checking: Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/12.13.10.944 Mobile Safari/537.36
:
: $ua: 12.13.10.944 mobile safari/537.36
: scanned: 12, 13, 10
: $browser_can_handle_samesite_none = 1
: ========================================
: Checking: Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/12.14.10.944 Mobile Safari/537.36
:
: $ua: 12.14.10.944 mobile safari/537.36
: scanned: 12, 14, 10
: $browser_can_handle_samesite_none = 1
: ========================================
: Checking: Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/13.14.10.944 Mobile Safari/537.36
:
: $ua: 13.14.10.944 mobile safari/537.36
: scanned: 13, 14, 10
: $browser_can_handle_samesite_none = 1
: ========================================
: Checking: Mozilla/5.0 (Linux; U; Android 6.0.1; zh-CN; F5121 Build/34.0.A.1.247) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/11.5.1.944 Mobile Safari/537.36
:
: $ua: 11.5.1.944 mobile safari/537.36
: scanned: 11, 5, 1
: $v1 < 12
: $browser_can_handle_samesite_none = 0
: ========================================
: Checking: Mozilla/5.0 (Linux; U; Android 4.4.2; zh-CN; HUAWEI MT7-TL00 Build/HuaweiMT7-TL00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/11.3.8.909 Mobile Safari/537.36
:
: $ua: 11.3.8.909 mobile safari/537.36
: scanned: 11, 3, 8
: $v1 < 12
: $browser_can_handle_samesite_none = 0
: ========================================
: Checking: Mozilla/5.0 (Linux; U; Android 8.1.0; zh-CN; EML-AL00 Build/HUAWEIEML-AL00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.108 baidu.sogo.uc.UCBrowser/11.9.4.974 UWS/2.13.1.48 Mobile Safari/537.36 AliApp(DingTalk/4.5.11) com.alibaba.android.rimet/10487439 Channel/227200 language/zh-CN
: Matched incompatible user-agent in the switch statement for Mozilla/5.0 (Linux; U; Android 8.1.0; zh-CN; EML-AL00 Build/HUAWEIEML-AL00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.108 baidu.sogo.uc.UCBrowser/11.9.4.974 UWS/2.13.1.48 Mobile Safari/537.36 AliApp(DingTalk/4.5.11) com.alibaba.android.rimet/10487439 Channel/227200 language/zh-CN
: ========================================
: Checking: Mozilla/5.0 (X11; U; Linux i686; en-US) U2/1.0.0 UCBrowser/9.3.1.344
:
: $ua: 9.3.1.344
: scanned: 9, 3, 1
: $v1 < 12
: $browser_can_handle_samesite_none = 0
: ========================================
: Checking: Mozilla/5.0(Linux;U;Android 5.1.1;zh-CN;OPPO A33 Build/LMY47V) AppleWebKit/537.36(KHTML,like Gecko) Version/4.0 Chrome/40.0.2214.89 UCBrowser/11.7.0.953 Mobile Safari/537.36
:
: $ua: 11.7.0.953 mobile safari/537.36
: scanned: 11, 7, 0
: $v1 < 12
: $browser_can_handle_samesite_none = 0
: ========================================
: Checking: UCWEB/2.0 (Java; U; MIDP-2.0; Nokia203/20.37) U2/1.0.0 UCBrowser/8.7.0.218 U2/1.0.0 Mobile
:
: $ua: 8.7.0.218 u2/1.0.0 mobile
: scanned: 8, 7, 0
: $v1 < 12
: $browser_can_handle_samesite_none = 0
: ========================================
: Checking: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (Linux; Android 6.0.1; RedMi Note 5 Build/RB3N5C; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.157 Safari/537.36
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36
: Matched incompatible user-agent in the switch statement for Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36
: ========================================
: Checking: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36
: Matched incompatible user-agent in the switch statement for Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36
: ========================================
: Checking: Mozilla/5.0 (Linux; Ubuntu 14.04) AppleWebKit/537.36 Chromium/35.0.1870.2 Safari/537.36
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (Linux; Ubuntu 14.04 like Android 4.4) AppleWebKit/537.36 Chromium/35.0.1870.2 Mobile Safari/537.36
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (SMART-TV; X11; Linux armv7l) AppleWebKit/537.42 (KHTML, like Gecko) Chromium/25.0.1349.2 Chrome/25.0.1349.2 Safari/537.42
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (Linux; Ubuntu 15.04 like Android 4.4) AppleWebKit/537.36 Chromium/53.0.2785.143 Mobile Safari/537.36
: Matched incompatible user-agent in the switch statement for Mozilla/5.0 (Linux; Ubuntu 15.04 like Android 4.4) AppleWebKit/537.36 Chromium/53.0.2785.143 Mobile Safari/537.36
: ========================================
: Checking: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.30 (KHTML, like Gecko) Ubuntu/11.04 Chromium/12.0.742.112 Chrome/12.0.742.112 Safari/534.30
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (X11; Linux i686) AppleWebKit/534.30 (KHTML, like Gecko) Ubuntu/10.10 Chromium/12.0.742.112 Chrome/12.0.742.112 Safari/534.30
: No match for this user-agent string
: ========================================
: Checking: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.30 (KHTML, like Gecko) Ubuntu/10.10 Chromium/12.0.742.112 Chrome/12.0.742.112 Safari/534.30
: No match for this user-agent string


Comments
Thomas898
Nimbostratus
Nimbostratus

Got it, thanks for this. I have understand all the things and get back to you in few times. tellgamestop

Version history
Last update:
‎07-Feb-2020 20:37
Updated by:
Contributors