topic Re: How to edit props.conf to line break modsecurity events? in Getting Data In

How to edit props.conf to line break modsecurity events?

Shark2112 — Tue, 29 Sep 2020 12:09:37 GMT

Hey guys. I want modsecurity events in Splunk, but can't make right config.

I have events like this:

--d021db15-A--
[22/Dec/2016:12:46:22 +0300] WFug7n8AAAEAAAgUFKYAAABM 192.168.13.2 58507 192.168.13.141 80
--d021db15-B--
GET /?param=%3Cscript%3Ealert(1);%3C/script%3E HTTP/1.1
Host: 192.168.13.141
Connection: keep-alive
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding: gzip, deflate, sdch
Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4
If-None-Match: "13-54429b1b62789"
If-Modified-Since: Wed, 21 Dec 2016 11:45:49 GMT

--d021db15-F--
HTTP/1.1 304 Not Modified
Last-Modified: Wed, 21 Dec 2016 11:45:49 GMT
ETag: "13-54429b1b62789"
Accept-Ranges: bytes
Content-Length: 0
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html

--d021db15-E--

--d021db15-H--
Message: Warning. Pattern match "^[\\d.:]+$" at REQUEST_HEADERS:Host. [file "/usr/local/apache2/modsecurity.d/rules/REQUEST-920-PROTOCOL-ENFORCEMENT.conf"] [line "793"] [id "920350"] [rev "2"] [msg "Host header i

r: ModSecurity for Apache/2.9.1 (http://www.modsecurity.org/); OWASP_CRS/3.0.0.
Server: Apache/2.4.23 (Unix) PHP/5.6.29
Engine-Mode: "DETECTION_ONLY"

--d021db15-Z--

so it's start from --\w+-A-- and end with --\w+-Z--

my config:
[modsec_audit]
CHARSET = UTF-8
NO_BINARY_CHECK = true
category = Custom
pulldown_type = 1
LINE_BREAKER = --\w+-A--
disabled = false
SHOULD_LINEMERGE = true
MUST_BREAK_AFTER = --\w+-Z--
TRUNCATE = 0

or BREAK_ONLY_BEFORE_DATE = true instead MUST_BREAK_AFTER.

but it's all wrong and i see events like "Stopwatch: 1482404729925426 2897 (- - -)" for example, or starting from .

Re: How to edit props.conf to line break modsecurity events?

niketn — Tue, 29 Sep 2020 12:11:35 GMT

I copied your data twice to a dummy log file and modified time to mark separate events. I was able to get two events just by adding BREAK_ONLY_BEFORE condition on top of SHOULD_LINEMERGE=true

[modsec_audit]
SHOULD_LINEMERGE=true
NO_BINARY_CHECK=true
BREAK_ONLY_BEFORE=--d021db15-A--

Please let me know if this is what you expect.

Re: How to edit props.conf to line break modsecurity events?

somesoni2 — Fri, 23 Dec 2016 16:12:50 GMT

Something like this would work fine

[modsec_audit]
category = Custom
LINE_BREAKER = ([\r\n]+)(?=--\w+-A-)
SHOULD_LINEMERGE = false
TRUNCATE = 0
TIME_PREFIX = \[
TIME_FORMAT = %d/%b/%Y:%H:%M:%S %z
MAX_TIMESTAMP_LOOKAHEAD = 26

Re: How to edit props.conf to line break modsecurity events?

Shark2112 — Mon, 26 Dec 2016 09:24:24 GMT

I made separated index and add file with same sourcetype and all work fine, it's so strange. I will check the difference and write after.

Re: How to edit props.conf to line break modsecurity events?

Shark2112 — Mon, 26 Dec 2016 15:50:18 GMT

trouble was in MAX_EVENTS, that's why i have truncated events