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Dan_Markhasin_1's avatar
Dan_Markhasin_1
Icon for Nimbostratus rankNimbostratus
Oct 28, 2015

Using ASM violation details in an iRule

Hi,

I am writing an iRule to log all ASM violations to a remote syslog server. I am trying to get as much data as possible (what was the payload, what was the violation, etc). Based on the documentation here, I should be able to use [ASM::violation details] to get a "list of lists" that match what is being returned by [ASM::violation names].

However when I use [ASM::violation details] it returns a list of lists that doesn't map to the [ASM::violation names], at least not based on the example here: https://devcentral.f5.com/wiki/iRules.ASM__violation.ashx

This is what [ASM::violation details] returns:

{viol_index 10} {viol_name VIOL_XML_SCHEMA} {context URL} {object_data.object L2l0c21wbGFubmVyd3MvZGV2ZWxvcGVyLmFzbXg=} {staging 0} {content_profile_data.type XML} {content_profile_data.content_id 28} {content_profile_data.content_profile_id 200} {content_profile_data.buffer dGVtOmV4Y2VwdGlvblNvdXJjMmU=} {content_profile_data.index 214} {content_profile_data.location unknown} {content_profile_data.error_code 33} {content_profile_data.specific_desc {Malformed document - schema validation failed}} {content_profile_data.fault_detail {Element is not defined in schema}} {viol_index 11} {viol_name VIOL_XML_MALFORMED} {context URL} {object_data.object L2l0c21wbGFubmVyd3MvZGV2ZWxvcGVyLmFzbXg=} {staging 0} {content_profile_data.type XML} {content_profile_data.content_id 28} {content_profile_data.content_profile_id 200} {content_profile_data.buffer Pg==} {content_profile_data.index 258} {content_profile_data.location unknown}

How can I map between the data returned from violation names to this list? The only way I see is pulling the element which is at index $i + whatever I need from that list. So, for example, for the first item in violation names (where i = 0), if I want to get the specific_desc, I would need to lookup field $i+12...

Has anyone had experience with writing iRules that use [ASM::violation details] and can help me out? 🙂

Thanks, Dan

application delivery
ASM Advanced WAF
devops
iRules
security

2 Replies

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  • Chris_Grant's avatar
    Chris_Grant
    Icon for Employee rankEmployee
    Jan 27, 2016
    I can't immediately help you to do this with iRules, but is there a reason you're not using the native remote logging in ASM as detailed here: https://support.f5.com/kb/en-us/solutions/public/13000/000/sol13080.html?
  • Dan_Markhasin_1's avatar
    Dan_Markhasin_1
    Icon for Nimbostratus rankNimbostratus
    Jan 28, 2016

    Because we need the logs to be in a very specific format and include information that ASM does not provide (various identifying strings that we add to the log entry). So the log entry is built during the flow of the iRule and eventually shipped to the log server.

    I ended up doing it with a foreach loop over ASM::violation details.

    foreach {viol} [ASM::violation details] {
            if {[lindex $viol 0] eq "viol_name"} {
                set name [lindex $viol 1]
                append violations "$name "
            }
            ...