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# ------------------------------------------------------------------------ # OWASP ModSecurity Core Rule Set ver.3.0.2 # Copyright (c) 2006-2016 Trustwave and contributors. All rights reserved. # # The OWASP ModSecurity Core Rule Set is distributed under # Apache Software License (ASL) version 2 # Please see the enclosed LICENSE file for full details. # ------------------------------------------------------------------------ # # The purpose of this file is to hold LOCAL exceptions for your site. The # types of rules that would go into this file are one where you want to # short-circuit inspection and allow certain transactions to pass through # inspection or if you want to alter rules that are applied. # # This file is named REQUEST-900-EXCLUSION-RULES-BEFORE-CRS.conf.example for a # very specific reason. Files affixed with the .example extension are designed # to contain user created/modified data. The '.example'. extension should be # renamed to end in .conf. The advantage of this is that when OWASP CRS is # updated, the updates will not overwrite a user generated configuration file. # # As a result of this design paradigm users are encouraged NOT to directly # modify rules. Instead they should use this # REQUEST-900-EXCLUSION-RULES-BEFORE-CRS and the # RESPONSE-999-EXCLUSION-RULES-AFTER-CRS file to modify OWASP rules using # methods similar to the examples specified below. # # REQUEST-900-EXCLUSION-RULES-BEFORE-CRS and # RESPONSE-999-EXCLUSION-RULES-AFTER-CRS serve different purposes. ModSecurity # effectively maintains two different context: startup, and per transaction. # As a rule, directives are processed within the startup context. While they # can affect the per transaction context they generally remain fixed during the # execution of ModSecurity. # # As a result if one wanted to disable a rule at bootup the SecRuleRemoveById # directive or one of its siblings would have to be placed AFTER the rule is # listed, otherwise it will not have knowledge of the rules existence (since # these rules are read in at the same time). This means that when using # directives that effect SecRules, these exceptions should be placed AFTER all # the existing rules. This is why RESPONSE-999-EXCLUSION-RULES-AFTER-CRS is # designed such that it loads LAST. # # Conversely, ModSecurity supports several actions that can change the state of # the underlying configuration during the per transaction context, this is when # rules are being processed. Generally, these are accomplished by using the # 'ctl' action. As these are part of a rule, they will be evaluated in the # order rules are applied (by physical location, considering phases). As a # result of this ordering a 'ctl' action should be placed with consideration to # when it will be executed. This is particularly relevant for the 'ctl' options # that involve modifying ID's (such as ruleRemoveById). In these cases it is # important that such rules are placed BEFORE the rule ID they will affect. # Unlike the setup context, by the time we process rules in the per-transaction # context, we are already aware of all the rule ID's. It is by this logic that # we include rules such as this BEFORE all the remaining rules. As a result # REQUEST-900-EXCLUSION-RULES-BEFORE-CRS is designed to load FIRST. # # As a general rule: # ctl:ruleEngine -> place in REQUEST-900-EXCLUSION-RULES-BEFORE-CRS # ctl:ruleRemoveById -> place in REQUEST-900-EXCLUSION-RULES-BEFORE-CRS # ctl:ruleRemoveByMsg -> place in REQUEST-900-EXCLUSION-RULES-BEFORE-CRS # ctl:ruleRemoveByTag -> place in REQUEST-900-EXCLUSION-RULES-BEFORE-CRS # ctl:ruleRemoveTargetById -> place in REQUEST-900-EXCLUSION-RULES-BEFORE-CRS # ctl:ruleRemoveTargetByMsg -> place in REQUEST-900-EXCLUSION-RULES-BEFORE-CRS # ctl:ruleRemoveTargetByTag -> place in REQUEST-900-EXCLUSION-RULES-BEFORE-CRS # # SecRuleRemoveById -> place in RESPONSE-999-EXCLUSION-RULES-AFTER-CRS # SecRuleRemoveByMsg -> place in RESPONSE-999-EXCLUSION-RULES-AFTER-CRS # SecRuleRemoveByTag -> place in RESPONSE-999-EXCLUSION-RULES-AFTER-CRS # SecRuleUpdateActionById -> place in RESPONSE-999-EXCLUSION-RULES-AFTER-CRS # SecRuleUpdateTargetById -> place in RESPONSE-999-EXCLUSION-RULES-AFTER-CRS # SecRuleUpdateTargetByMsg -> place in RESPONSE-999-EXCLUSION-RULES-AFTER-CRS # SecRuleUpdateTargetByTag -> place in RESPONSE-999-EXCLUSION-RULES-AFTER-CRS # # # What follows are a group of examples that show you how to perform rule # exclusions. # # # Example Exclusion Rule: Disable inspection for an authorized client # # This ruleset allows you to control how ModSecurity will handle traffic # originating from Authorized Vulnerability Scanning (AVS) sources. See # related blog post - # http://blog.spiderlabs.com/2010/12/advanced-topic-of-the-week-handling-authorized-scanning-traffic.html # # White-list ASV network block (no blocking or logging of AVS traffic) Update # IP network block as appropriate for your AVS traffic # # ModSec Rule Exclusion: Disable Rule Engine for known ASV IP # SecRule REMOTE_ADDR "@ipMatch 192.168.1.100" \ # "phase:1,id:1000,pass,nolog,ctl:ruleEngine=Off" # # # Example Exclusion Rule: Removing a specific ARGS parameter from inspection # for an individual rule # # This rule shows how to conditionally exclude the "password" # parameter for rule 942100 when the REQUEST_URI is /index.php # ModSecurity Rule Exclusion: 942100 SQL Injection Detected via libinjection # # SecRule REQUEST_URI "@beginsWith /index.php" \ # "id:1001,phase:1,pass,nolog, \ # ctl:ruleRemoveTargetById=942100;ARGS:password" # # # Example Exclusion Rule: Removing a specific ARGS parameter from inspection # for only certain attacks # # Attack rules within the CRS are tagged, with tags such as 'attack-lfi', # 'attack-sqli', 'attack-xss', 'attack-injection-php', et cetera. # # ModSecurity Rule Exclusion: Disable inspection of ARGS:pwd # for all rules tagged attack-sqli # SecRule REQUEST_FILENAME "@endsWith /wp-login.php" \ # "id:1002,phase:request,pass,nolog,\ # ctl:ruleRemoveTargetByTag=attack-sqli;ARGS:pwd" # # Example Exclusion Rule: Removing a specific ARGS parameter from inspection # for all CRS rules # # This rule illustrates that we can use tagging very effectively to whitelist a # common false positive across an entire ModSecurity instance. This can be done # because every rule in OWASP_CRS is tagged with OWASP_CRS. This will NOT # affect custom rules. # # ModSecurity Rule Exclusion: Disable inspection of ARGS:pwd # for all CRS rules # SecRule REQUEST_FILENAME "@endsWith /wp-login.php" \ # "id:1003,phase:request,pass,nolog,\ # ctl:ruleRemoveTargetByTag=CRS;ARGS:pwd" # # Example Exclusion Rule: Removing a range of rules # # This rule illustrates that we can remove a rule range via a ctl action. # This uses the fact, that rules are grouped by topic in rule files covering # a certain id range. # # ModSecurity Rule Exclusion: Disable all SQLi and XSS rules # SecRule REQUEST_FILENAME "@beginsWith /admin" \ # "id:1004,phase:request,pass,nolog,\ # ctl:ruleRemoveById=941000-942999" # # # The application specific rule exclusion files # REQUEST-903.9001-DRUPAL-EXCLUSION-RULES.conf # REQUEST-903.9002-WORDPRESS-EXCLUSION-RULES.conf # bring additional examples which can be useful then tuning a service.