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Introduction

nxtool is a whitelist generation tool for naxsi. It provides the following features :

  • Generating whitelists, based on templates, along with "rating"
  • Providing minimal statistics aiming at helping user in whitelist choices
  • Tag existing events matching provided whitelists for exclusion of whitelist generation
  • Tag existing events matching provided IPs for exclusion of whitelist generation

Tagging is important as it will exclude events from whitelist generation process and provide tracking.

Usage

Scope/Filtering options

-s SERVER, --server=SERVER

Whitelist generation options

-t TEMPLATE, --template=TEMPLATE

Given a path to a template file, attempt to generate matching whitelists. Possible whitelists will be tested versus database, only the ones with "good" scores will be kept.

-f, --full-auto

Attempts whitelist generation for all templates present in rules_path.

--slack

Sets nxtool to ignore scores and display all generated whitelists.

Tagging options

-w WL_FILE, --whitelist-path=WL_FILE

Given a whitelist file, finds matching events in database.

-i IPS, --ip-path=IPS

Given a list of ips (separatated by \n), finds matching events in database.

--tag

Performs the actual tagging. If not specified, matching events are simply displayed.

Statistics generation options

-x, --stats

Generate statistics about current's db content.

Rating system

  • rule_ip_count : nb of peers hitting rule
  • rule_uri_count : nb of uri the rule hitted on
  • template_ip_count : nb of peers hitting template
  • template_uri_count : nb of uri the rule hitted on
  • ip_ratio_template : ratio of peers hitting the template vs peers hitting the rule
  • uri_ratio_template : ratio of uri hitting the template vs uri hitting the rule
  • ip_ratio_global : ratio of peers hitting the rule vs all peers
  • uri_ratio_global : ratio of uri hitting the rule vs all uri

Terms

Whitelist

A valid naxsi whitelist, ie. BasicRule wl:X "mz:ARGS";

Template

A template for whitelist generation, ie.

{ "zone" : "HEADERS", "var_name" : "cookie", "id" : "?"}

This template means that nxapi will extract all possible rule IDs found in zone $HEADERS_VAR:cookie, and attempt to generate whitelists from it :

BasicRule wl:X "mz:$HEADERS_VAR:cookie"; ..

templates so far support :

  • "key" : "?" : Expand key values to all values matching other template's criterias. keep in mind that having several '?' fields will seriously increase processing time (uniques(key1) * uniques(key2) ..)
  • "?key" : ".*p.*w.*d.*" : Expand key values to all values matching regex. In outputed rule, key is set to matching data, BasicRule wl:X "mz:$BODY_VAR:user_password";
  • _statics : { "id" : "0" } : If '_statics' is present, it will override fields values in final rule.
  • _success : {} and _warnings : {} : _success and _warning allow to expand ratings rules.