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modsecurity.conf-recommended
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# -- Rule engine initialization ---------------------------------------------- # Enable ModSecurity, attaching it to every transaction. Use detection # only to start with, because that minimises the chances of post-installation # disruption. # SecRuleEngine DetectionOnly # -- Request body handling --------------------------------------------------- # Allow ModSecurity to access request bodies. If you don't, ModSecurity # won't be able to see any POST parameters, which opens a large security # hole for attackers to exploit. # SecRequestBodyAccess On # Enable XML request body parser. # Initiate XML Processor in case of xml content-type # SecRule REQUEST_HEADERS:Content-Type "(?:application(?:/soap\+|/)|text/)xml" \ "id:'200000',phase:1,t:none,t:lowercase,pass,nolog,ctl:requestBodyProcessor=XML" # Enable JSON request body parser. # Initiate JSON Processor in case of JSON content-type; change accordingly # if your application does not use 'application/json' # SecRule REQUEST_HEADERS:Content-Type "application/json" \ "id:'200001',phase:1,t:none,t:lowercase,pass,nolog,ctl:requestBodyProcessor=JSON" # Sample rule to enable JSON request body parser for more subtypes. # Uncomment or adapt this rule if you want to engage the JSON # Processor for "+json" subtypes # #SecRule REQUEST_HEADERS:Content-Type "^application/.+[+]json$" \ # "id:'200006',phase:1,t:none,t:lowercase,pass,nolog,ctl:requestBodyProcessor=JSON" # Maximum request body size we will accept for buffering. If you support # file uploads then the value given on the first line has to be as large # as the largest file you are willing to accept. The second value refers # to the size of data, with files excluded. You want to keep that value as # low as practical. # SecRequestBodyLimit 13107200 SecRequestBodyNoFilesLimit 131072 # Store up to 128 KB of request body data in memory. When the multipart # parser reaches this limit, it will start using your hard disk for # storage. That is slow, but unavoidable. # SecRequestBodyInMemoryLimit 131072 # What do do if the request body size is above our configured limit. # Keep in mind that this setting will automatically be set to ProcessPartial # when SecRuleEngine is set to DetectionOnly mode in order to minimize # disruptions when initially deploying ModSecurity. # SecRequestBodyLimitAction Reject # Verify that we've correctly processed the request body. # As a rule of thumb, when failing to process a request body # you should reject the request (when deployed in blocking mode) # or log a high-severity alert (when deployed in detection-only mode). # SecRule REQBODY_ERROR "!@eq 0" \ "id:'200002', phase:2,t:none,log,deny,status:400,msg:'Failed to parse request body.',logdata:'%{reqbody_error_msg}',severity:2" # By default be strict with what we accept in the multipart/form-data # request body. If the rule below proves to be too strict for your # environment consider changing it to detection-only. You are encouraged # _not_ to remove it altogether. # SecRule MULTIPART_STRICT_ERROR "!@eq 0" \ "id:'200003',phase:2,t:none,log,deny,status:400, \ msg:'Multipart request body failed strict validation: \ PE %{REQBODY_PROCESSOR_ERROR}, \ BQ %{MULTIPART_BOUNDARY_QUOTED}, \ BW %{MULTIPART_BOUNDARY_WHITESPACE}, \ DB %{MULTIPART_DATA_BEFORE}, \ DA %{MULTIPART_DATA_AFTER}, \ HF %{MULTIPART_HEADER_FOLDING}, \ LF %{MULTIPART_LF_LINE}, \ SM %{MULTIPART_MISSING_SEMICOLON}, \ IQ %{MULTIPART_INVALID_QUOTING}, \ IP %{MULTIPART_INVALID_PART}, \ IH %{MULTIPART_INVALID_HEADER_FOLDING}, \ FL %{MULTIPART_FILE_LIMIT_EXCEEDED}'" # Did we see anything that might be a boundary? # SecRule MULTIPART_UNMATCHED_BOUNDARY "!@eq 0" \ "id:'200004',phase:2,t:none,log,deny,msg:'Multipart parser detected a possible unmatched boundary.'" # PCRE Tuning # We want to avoid a potential RegEx DoS condition # SecPcreMatchLimit 100000 SecPcreMatchLimitRecursion 100000 # Some internal errors will set flags in TX and we will need to look for these. # All of these are prefixed with "MSC_". The following flags currently exist: # # MSC_PCRE_LIMITS_EXCEEDED: PCRE match limits were exceeded. # SecRule TX:/^MSC_/ "!@streq 0" \ "id:'200005',phase:2,t:none,deny,msg:'ModSecurity internal error flagged: %{MATCHED_VAR_NAME}'" # -- Response body handling -------------------------------------------------- # Allow ModSecurity to access response bodies. # You should have this directive enabled in order to identify errors # and data leakage issues. # # Do keep in mind that enabling this directive does increases both # memory consumption and response latency. # SecResponseBodyAccess On # Which response MIME types do you want to inspect? You should adjust the # configuration below to catch documents but avoid static files # (e.g., images and archives). # SecResponseBodyMimeType text/plain text/html text/xml # Buffer response bodies of up to 512 KB in length. SecResponseBodyLimit 524288 # What happens when we encounter a response body larger than the configured # limit? By default, we process what we have and let the rest through. # That's somewhat less secure, but does not break any legitimate pages. # SecResponseBodyLimitAction ProcessPartial # -- Filesystem configuration ------------------------------------------------ # The location where ModSecurity stores temporary files (for example, when # it needs to handle a file upload that is larger than the configured limit). # # This default setting is chosen due to all systems have /tmp available however, # this is less than ideal. It is recommended that you specify a location that's private. # SecTmpDir /tmp/ # The location where ModSecurity will keep its persistent data. This default setting # is chosen due to all systems have /tmp available however, it # too should be updated to a place that other users can't access. # SecDataDir /tmp/ # -- File uploads handling configuration ------------------------------------- # The location where ModSecurity stores intercepted uploaded files. This # location must be private to ModSecurity. You don't want other users on # the server to access the files, do you? # #SecUploadDir /opt/modsecurity/var/upload/ # By default, only keep the files that were determined to be unusual # in some way (by an external inspection script). For this to work you # will also need at least one file inspection rule. # #SecUploadKeepFiles RelevantOnly # Uploaded files are by default created with permissions that do not allow # any other user to access them. You may need to relax that if you want to # interface ModSecurity to an external program (e.g., an anti-virus). # #SecUploadFileMode 0600 # -- Debug log configuration ------------------------------------------------- # The default debug log configuration is to duplicate the error, warning # and notice messages from the error log. # #SecDebugLog /opt/modsecurity/var/log/debug.log #SecDebugLogLevel 3 # -- Audit log configuration ------------------------------------------------- # Log the transactions that are marked by a rule, as well as those that # trigger a server error (determined by a 5xx or 4xx, excluding 404, # level response status codes). # SecAuditEngine RelevantOnly SecAuditLogRelevantStatus "^(?:5|4(?!04))" # Log everything we know about a transaction. SecAuditLogParts ABDEFHIJZ # Use a single file for logging. This is much easier to look at, but # assumes that you will use the audit log only ocassionally. # SecAuditLogType Serial SecAuditLog /var/log/apache2/modsec_audit.log # Specify the path for concurrent audit logging. #SecAuditLogStorageDir /opt/modsecurity/var/audit/ # -- Miscellaneous ----------------------------------------------------------- # Use the most commonly used application/x-www-form-urlencoded parameter # separator. There's probably only one application somewhere that uses # something else so don't expect to change this value. # SecArgumentSeparator & # Settle on version 0 (zero) cookies, as that is what most applications # use. Using an incorrect cookie version may open your installation to # evasion attacks (against the rules that examine named cookies). # SecCookieFormat 0 # Specify your Unicode Code Point. # This mapping is used by the t:urlDecodeUni transformation function # to properly map encoded data to your language. Properly setting # these directives helps to reduce false positives and negatives. # SecUnicodeMapFile unicode.mapping 20127 # Improve the quality of ModSecurity by sharing information about your # current ModSecurity version and dependencies versions. # The following information will be shared: ModSecurity version, # Web Server version, APR version, PCRE version, Lua version, Libxml2 # version, Anonymous unique id for host. SecStatusEngine On