Is it possible to select ASM BoT profile from irule?
Hi. . Is it possible to select BoT profile from irule? . Concept is we have different set of IP which need to allow "some" BoT type. That why we can't use whitelist IP in BoT profile because it will allow all BoT type. So We want to use iRule to check if it IP A > use BoT profile which have some exception, but if all other IP > use normally BoT profile. . when HTTP_REQUEST { # Check IP and select BoT profile from that if { [IP::client_addr] eq "A" } { ASM::enable allow_some_bot_profile } else { ASM::enable normally_bot_profile } } ps. I didn't see any document about how to select BoT profile. So I'm not sure if ASM::enable can do that.Trigger js challenge/Captcha for ip reputation/ip intelligence categories
Problem solved by this Code Snippet Because some ISP or cloud providers do not monitor their users a lot of times client ip addresses are marked as "spam sources" or "windows exploits" and as the ip addresses are dynamic and after time a legitimate user can use this ip addresses the categories are often stopped in the IP intelligence profile or under the ASM/AWAF policy. This usually happens in Public Clouds that do not monitor what their users do and the IP gets marked as bad then another good user after a day or two has this ip address and this causes the issue. For many of my clients I had to stop the ip reputation/ip intelligence category "spam sources" and in some cases "windows exploits" so having a javascript/captcha checks seems a nice compromise 😎 To still make use of this categories the users coming from those ip addresses can be forced to solve captcha checks or at least to be checked for javascript support! How to use this Code Snippet Have AWAF/ASM and ip intelligence licensed Add AWAF/ASM policy with irule support option (by default not enabled under the policy) or/and Bot profile under the Virtual server Optionally add IP intelligence profile or enable the Ip intelligence under the WAF policy without the categories that cause a lot of false positives, Add the irule and if needed modify the categories for which it triggers Do not forget to first create the data group, used in the code or delete that part of the code and to uncomment the Bot part of the code, if you plan to do js check and not captcha and maybe comment the captcha part ! Code Snippet Meta Information Version: 17.1.3 Coding Language: TCL Code You can find the code and further documentation in my GitHub repository: reputation-javascript-captcha-challlenge/ at main · Nikoolayy1/reputation-javascript-captcha-challlenge when HTTP_REQUEST { # Take the ip address for ip reputation/intelligence check from the XFF header if it comes from the whitelisted source ip addresses in data group "client_ip_class" if { [HTTP::header exists "X-Forwarded-For"] && [class match [IP::client_addr] equals "/Common/client_ip_class"] } { set trueIP [HTTP::header "X-Forwarded-For"] } else { set trueIP [IP::client_addr] } # Check if IP reputation is triggered and it is containing "Spam Sources" if { ([llength [IP::reputation $trueIP]] != 0) && ([IP::reputation $trueIP] contains "Spam Sources") }{ log local0. "The category is [IP::reputation $trueIP] from [IP::client_addr]" # Set the variable 1 or bulean true as to trigger ASM captcha or bot defense javascript set js_ch 1 } else { set js_ch 0 } # Custom response page just for testing if there is no real backend origin server for testing if {!$js_ch} { HTTP::respond 200 content { <html> <head> <title>Apology Page</title> </head> <body> We are sorry, but the site you are looking for is temporarily out of service<br> If you feel you have reached this page in error, please try again. </body> </html> } } } # when BOTDEFENSE_ACTION { # Trigger bot defense action javascript check for Spam Sources # if {$js_ch && (not ([BOTDEFENSE::reason] starts_with "passed browser challenge")) && ([BOTDEFENSE::action] eq "allow") }{ # BOTDEFENSE::action browser_challenge # } # } when ASM_REQUEST_DONE { # Trigger ASM captcha check only for users comming from Spam sources that have not already passed the captcha check (don't have the captcha cookie) if {$js_ch && [ASM::captcha_status] ne "correct"} { set res [ASM::captcha] if {$res ne "ok"} { log local0. "Cannot send captcha_challenge: \"$res\"" } } } Extra References: BOTDEFENSE::action ASM::captcha ASM::captcha_statusF5 ASM/AWAF Preventing unauthorized users accessing admin path​ using iRule script
The below code uses the new BIG-IP variables " [ASM::is_authenticated] " and " [ASM::username] " and the code is simple enough as if you are authenticated but not admin then you will not get access to the url path " /about.php " and this is logged in the /var/log/asm logs because " log local3. ". At the end of the article I have shown how with APM you can accomplish AD group limit for specific urls but then the Authentication is moved on the APM while the AWAF iRule example the authentication is on the origin web server and the AWAF just handles the URL Authorization. when ASM_REQUEST_DONE { if { [ASM::is_authenticated] && [HTTP::path] equals "/about.php" } { log local3. "This request was sent by user [ASM::username]." if {[ASM::username] equals "admin"} { log local3. "The admin has logged!" return } else { drop } } } Github link: Nikoolayy1/F5_AWAF-ASM-ADMIN-Access: F5 BIG-IP iRule code for limiting users by to access urls! The harder part is that you need to do several prerequisites that I will explain here: Enable iRule support in the ASM policy. Configure a login page and optionally login enforcement (if " /about.php " is not blocked by the origin server to not be accessible before login this is a needed step!) Enable session tracking by login page Attach the irule Test and see Example logs: cat /var/log/asm ......... Jun 25 03:59:33 bigip1.com info tmm2[11400]: Rule /Common/f5-asm-allow-admin <ASM_REQUEST_DONE>: This request was sent by user admin. Jun 25 03:59:33 bigip1.com info tmm2[11400]: Rule /Common/f5-asm-allow-admin <ASM_REQUEST_DONE>: The admin has logged! [root@bigip1:Active:Standalone] config # The DVWA app was used for this demo that is old but gold and there are many F5 demos how to configure login enforcement for it! Here is a youtube video for assistance: BIG-IP AWAF Demo 32 - Use Login Page Enforcement with F5 BIG-IP Adv WAF (formerly ASM) Extra links (there is also a new event "ASM_RESPONSE_LOGIN"): ASM::username ASM::is_authenticated https://clouddocs.f5.com/api/irules/ASM.html AD group url enforcement: If you want to control access to URLs based on AD groups I suggest seeing the F5 APM/Acess module that will take of the authentication and with Layer 7 ACL each AD group could be limited what it has access to. APM and AWAF can work together as with layered virtual server AWAF can be before the APM as by default is after it and then to get the username you need to use the login page feature and not "Use APM username and Session ID" feature in the AWAF policy. Configuring Access Control Lists https://my.f5.com/manage/s/article/K00363504 https://my.f5.com/manage/s/article/K03113285 https://my.f5.com/manage/s/article/K54217479 Example APM profile of type LTM+APM and the APM policy for anyone interested where the APM uses AD to authenticate the users and query for group data and the members for of the guest group have an ACL assigned that limits their access 😜 Summary: This probably will be seen as well in F5 NEXT with many more cool features !
[ASM] : SQL-INJ "end-quote UNION" - How to allow this signature to specific url/uri/parameter only
Hi Team , can someone explain me the attack type - end-quote UNION and the solution to allow this signature to specific url/uri/parameter only. Attack Type : SQL-Injection Detected Keyword : ,\"Valore\":\"UNION-GLASS0x20S.R.L.\"},{\&quo Attack Signature : SQL-INJ "end-quote UNION" (Parameter) Context : Parameter (detected in Form Data) Parameter Level : Global Parameter Value : \"ArrayValori\":null
How to allow Request getting blocked due to Malformed JSON data
Hi Everyone, I've little trouble understanding how i can allow this request. Requests are getting blocked at WAF end due to "Malformed JSON data" violation (Illegal character encountered - json syntax error -" / ") Can i allow / (forward slash) character to provide exception for this violation & keep malformed json data blocking setting as it is. and how can i achieve this.
F5 ASM XML processing - policy name.
Hello, we have an error message in logs: ASM out of memory error: event code X89 Exceeded maximum memory assigned for XML processing we have already increased both variables total_xml_memory and additional_xml_memory_in_mb to 4GB but they still appear. What i wanted to ask if its possible to identify which ASM policy generates these logs? Or which policy is responsible for the most of xml memory usage? Is it possible to create an irule that will check this and assign custom violation with policy name (and request details) that raised this violation regarding xml memory? Because as it is now we would have to further increase additional xml memory variable and maybe its better to troubleshoot why is it getting exceeded in the first place?
