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617
naxsi-0.55.3/naxsi.h
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617
naxsi-0.55.3/naxsi.h
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/*
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* NAXSI, a web application firewall for NGINX
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* Copyright (C) 2016, Thibault 'bui' Koechlin
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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||||
* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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||||
*
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||||
* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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||||
* including the two.
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* You must obey the GNU General Public License in all respects
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||||
* for all of the code used other than OpenSSL. If you modify
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||||
* file(s) with this exception, you may extend this exception to your
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||||
* version of the file(s), but you are not obligated to do so. If you
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||||
* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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||||
* files in the program, then also delete it here.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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||||
* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __FOO_H__
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#define __FOO_H__
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#define NAXSI_VERSION "0.55.3"
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#include <nginx.h>
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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#include <ngx_event.h>
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#include <ngx_md5.h>
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#include <ngx_http_core_module.h>
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#include <pcre.h>
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#include <ctype.h>
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#include "ext/libinjection/libinjection_sqli.h"
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#include "ext/libinjection/libinjection_xss.h"
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extern ngx_module_t ngx_http_naxsi_module;
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/*
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** as the #ifdef #endif for debug are getting really messy ...
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** Bellow are all the possibles debug defines. To enable associated feature
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** debug, just set it to 1. Do not comment the actual define except if you
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** know all the associated debug calls are deleted.
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** The idea is that the compiler will optimize out the do { if (0) ... } while (0);
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*/
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#define _naxsi_rawbody 0
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#define _debug_basestr_ruleset 0
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#define _debug_custom_score 0
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#define _debug_body_parse 0
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#define _debug_cfg_parse_one_rule 0
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#define _debug_zone 0
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#define _debug_extensive_log 0
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#define _debug_loc_conf 0
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#define _debug_main_conf 0
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#define _debug_mechanics 0
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#define _debug_json 0
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#define _debug_modifier 0
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#define _debug_payload_handler 0
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#define _debug_post_heavy 0
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#define _debug_rawbody 0
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#define _debug_readconf 0
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#define _debug_rx 0
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#define _debug_score 0
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#define _debug_spliturl_ruleset 0
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#define _debug_whitelist_compat 0
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#define _debug_whitelist 0
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#define _debug_whitelist_heavy 0
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#define _debug_whitelist_light 0
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#define wl_debug_rx 0
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#ifndef __NAXSI_DEBUG
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#define __NAXSI_DEBUG
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#define NX_DEBUG(FEATURE, DEF, LOG, ST, ...) do { if (FEATURE) ngx_log_debug(DEF, LOG, ST, __VA_ARGS__); } while (0)
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#endif
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#ifndef __NAXSI_LOG_DEBUG
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#define __NAXSI_LOG_DEBUG
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#define NX_LOG_DEBUG(FEATURE, DEF, LOG, ST, ...) do { if (FEATURE) ngx_conf_log_error(DEF, LOG, ST, __VA_ARGS__); } while (0)
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#endif
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/*
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** Here is globally how the structures are organized :
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**
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** [[ngx_http_dummy_main_conf_t]] is the main structure for the module.
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** it contains the core rules and a set of ngx_http_dummy_loc_conf_t,
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** for each NGINX location.
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** ---
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** [[ngx_http_dummy_loc_conf_t]] is the main structure for any NGINX
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** locations, that is - a web site. It contains both pointers to the core
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** rules, as well as whitelists, scores, denied_url and all flags. all
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** the data of a nginx location is held into the loc_conf_t struct.
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** The sets of rules are actually containted into [[ngx_http_rule_t]] structs.
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** ---
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** [[ngx_http_rule_t]] structs are used to hold any info about a rule, as well
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** as whitelists. (whitelists is just a 'kind' of rule).
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**
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*/
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/*
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** basic rule can have 4 (so far) kind of matching mechanisms
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** RX
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** STR
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** LIBINJ_XSS
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** LIBINJ_SQL
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*/
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enum DETECT_MECHANISM {
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NONE = -1,
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RX,
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STR,
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LIBINJ_XSS,
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LIBINJ_SQL
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};
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enum MATCH_TYPE {
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URI_ONLY=0,
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NAME_ONLY,
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MIXED
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};
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enum DUMMY_MATCH_ZONE {
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HEADERS=0,
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URL,
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ARGS,
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BODY,
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RAW_BODY,
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FILE_EXT,
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UNKNOWN
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};
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/*
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** struct used to store a specific match zone
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** in conf : MATCH_ZONE:[GET_VAR|HEADER|POST_VAR]:VAR_NAME:
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*/
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typedef struct
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{
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/* match in [name] var of body */
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ngx_flag_t body_var:1;
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/* match in [name] var of headers */
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ngx_flag_t headers_var:1;
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/* match in [name] var of args */
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ngx_flag_t args_var:1;
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/* match on URL [name] */
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ngx_flag_t specific_url:1;
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ngx_str_t target;
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/* to be used for regexed match zones */
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ngx_regex_compile_t *target_rx;
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ngx_uint_t hash;
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} ngx_http_custom_rule_location_t;
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/*
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** WhiteList Rules Definition :
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** A whitelist contains :
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** - an URI
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**
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** - one or several sets containing :
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** - an variable name ('foo') associated with a zone ($GET_VAR:foo)
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** - one or several rules id to whitelist
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*/
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typedef struct
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{
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/* match in full body (POST DATA) */
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ngx_flag_t body:1;
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/* match in [name] var of body */
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ngx_flag_t body_var:1;
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/* match in all headers */
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ngx_flag_t headers:1;
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/* match in [name] var of headers */
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ngx_flag_t headers_var:1;
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/* match in URI */
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ngx_flag_t url:1;
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/* match in args (bla.php?<ARGS>) */
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ngx_flag_t args:1;
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/* match in [name] var of args */
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ngx_flag_t args_var:1;
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/* match on a global flag : weird_request, big_body etc. */
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ngx_flag_t flags:1;
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/* match on file upload extension */
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ngx_flag_t file_ext:1;
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/* set if defined "custom" match zone (GET_VAR/POST_VAR/...) */
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ngx_array_t *ids;
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ngx_str_t *name;
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} ngx_http_whitelist_location_t;
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/*
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** this struct is used to aggregate all whitelist
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** that point to the same URI or the same VARNAME
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** all the "subrules" will then be stored in the "whitelist_locations"
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*/
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typedef struct
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{
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/*ngx_http_whitelist_location_t **/
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ngx_array_t *whitelist_locations;
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/* zone to wich the WL applies */
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enum DUMMY_MATCH_ZONE zone;
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/* if the "name" is only an url, specify it */
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int uri_only:1;
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/* does the rule targets the name
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instead of the content ?*/
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int target_name;
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ngx_str_t *name;
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ngx_int_t hash;
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ngx_array_t *ids;
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} ngx_http_whitelist_rule_t;
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/* basic rule */
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typedef struct
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{
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ngx_str_t *str; // string
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ngx_regex_compile_t *rx; // or regex
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/*
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** basic rule can have 4 (so far) kind of matching mechanisms :
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** RX, STR, LIBINJ_XSS, LIBINJ_SQL
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*/
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enum DETECT_MECHANISM match_type;
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/* is the match zone a regex or a string (hashtable) */
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ngx_int_t rx_mz;
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/* ~~~~~ match zones ~~~~~~ */
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ngx_int_t zone;
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/* match in full body (POST DATA) */
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ngx_flag_t body:1;
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ngx_flag_t raw_body:1;
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ngx_flag_t body_var:1;
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/* match in all headers */
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ngx_flag_t headers:1;
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ngx_flag_t headers_var:1;
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/* match in URI */
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ngx_flag_t url:1;
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/* match in args (bla.php?<ARGS>) */
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ngx_flag_t args:1;
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ngx_flag_t args_var:1;
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/* match on flags (weird_uri, big_body etc. */
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ngx_flag_t flags:1;
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/* match on file upload extension */
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ngx_flag_t file_ext:1;
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/* set if defined "custom" match zone (GET_VAR/POST_VAR/...) */
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ngx_flag_t custom_location:1;
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ngx_int_t custom_location_only;
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/* does the rule targets variable name instead ? */
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ngx_int_t target_name;
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/* custom location match zones list (GET_VAR/POST_VAR ...) */
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ngx_array_t *custom_locations;
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/* ~~~~~~~ specific flags ~~~~~~~~~ */
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ngx_flag_t negative:1;
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} ngx_http_basic_rule_t;
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/* define for RULE TYPE in rule_t */
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#define BR 1
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/* flags used for 'custom match rules', like $XSS > 7 */
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#define SUP 1
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#define SUP_OR_EQUAL 2
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#define INF 3
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#define INF_OR_EQUAL 4
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/*
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** This struct is used to store custom scores at runtime.
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** ie : $XSS = 7
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** tag is the $XSS and sc_score is 7
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*/
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typedef struct
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{
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ngx_str_t *sc_tag;
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ngx_int_t sc_score;
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ngx_flag_t block:1;
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ngx_flag_t allow:1;
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ngx_flag_t drop:1;
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ngx_flag_t log:1;
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} ngx_http_special_score_t;
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/*
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** This one is very related to the previous one,
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** it's used to store a score rule comparison.
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** ie : $XSS > 7
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*/
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typedef struct
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{
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ngx_str_t sc_tag;
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ngx_int_t sc_score;
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ngx_int_t cmp;
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ngx_flag_t block:1;
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ngx_flag_t allow:1;
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ngx_flag_t drop:1;
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ngx_flag_t log:1;
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} ngx_http_check_rule_t;
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/* TOP level rule structure */
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typedef struct
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{
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/* type of the rule */
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ngx_int_t type;
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/* simply put a flag if it's a wlr,
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wl_id array will be used to store the whitelisted IDs */
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ngx_flag_t whitelist:1;
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ngx_array_t *wlid_array;
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/* "common" data for all rules */
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ngx_int_t rule_id;
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ngx_str_t *log_msg; // a specific log message
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ngx_int_t score; //also handles DENY and ALLOW
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/* List of scores increased on rule match. */
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ngx_array_t *sscores;
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ngx_flag_t sc_block:1; //
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ngx_flag_t sc_allow:1; //
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// end of specific score tag stuff
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ngx_flag_t block:1;
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ngx_flag_t allow:1;
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ngx_flag_t drop:1;
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ngx_flag_t log:1;
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/* pointers on specific rule stuff */
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ngx_http_basic_rule_t *br;
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} ngx_http_rule_t;
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typedef struct
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{
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ngx_array_t *get_rules; /*ngx_http_rule_t*/
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ngx_array_t *body_rules;
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ngx_array_t *header_rules;
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ngx_array_t *generic_rules;
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ngx_array_t *raw_body_rules;
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ngx_array_t *locations; /*ngx_http_dummy_loc_conf_t*/
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ngx_log_t *log;
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} ngx_http_dummy_main_conf_t;
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/* TOP level configuration structure */
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typedef struct
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{
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/*
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** basicrule / mainrules, sorted by target zone
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*/
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ngx_array_t *get_rules;
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ngx_array_t *body_rules;
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ngx_array_t *raw_body_rules;
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ngx_array_t *header_rules;
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ngx_array_t *generic_rules;
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ngx_array_t *check_rules;
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/* raw array of whitelisted rules */
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ngx_array_t *whitelist_rules;
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/* raw array of transformed whitelists */
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ngx_array_t *tmp_wlr;
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/* raw array of regex-mz whitelists */
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ngx_array_t *rxmz_wlr;
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/* hash table of whitelisted URL rules */
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ngx_hash_t *wlr_url_hash;
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/* hash table of whitelisted ARGS rules */
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ngx_hash_t *wlr_args_hash;
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/* hash table of whitelisted BODY rules */
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ngx_hash_t *wlr_body_hash;
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/* hash table of whitelisted HEADERS rules */
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ngx_hash_t *wlr_headers_hash;
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/* rules that are globally disabled in one location */
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ngx_array_t *disabled_rules;
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/* counters for both processed requests and
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||||
blocked requests, used in naxsi_fmt */
|
||||
size_t request_processed;
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||||
size_t request_blocked;
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||||
ngx_int_t error;
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||||
ngx_array_t *persistant_data;
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ngx_flag_t extensive:1;
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||||
ngx_flag_t learning:1;
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||||
ngx_flag_t enabled:1;
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||||
ngx_flag_t force_disabled:1;
|
||||
ngx_flag_t pushed:1;
|
||||
ngx_flag_t libinjection_sql_enabled:1;
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ngx_flag_t libinjection_xss_enabled:1;
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ngx_str_t *denied_url;
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/* precomputed hash for dynamic variable lookup,
|
||||
variable themselves are boolean */
|
||||
ngx_uint_t flag_enable_h;
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||||
ngx_uint_t flag_learning_h;
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ngx_uint_t flag_post_action_h;
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||||
ngx_uint_t flag_extensive_log_h;
|
||||
/* precomputed hash for
|
||||
libinjection dynamic flags */
|
||||
ngx_uint_t flag_libinjection_xss_h;
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||||
ngx_uint_t flag_libinjection_sql_h;
|
||||
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||||
} ngx_http_dummy_loc_conf_t;
|
||||
|
||||
|
||||
/*
|
||||
** used to store sets of matched rules during runtime
|
||||
*/
|
||||
typedef struct
|
||||
{
|
||||
/* matched in [name] var of body */
|
||||
ngx_flag_t body_var:1;
|
||||
/* matched in [name] var of headers */
|
||||
ngx_flag_t headers_var:1;
|
||||
/* matched in [name] var of args */
|
||||
ngx_flag_t args_var:1;
|
||||
/* matched on URL */
|
||||
ngx_flag_t url:1;
|
||||
/* matched in filename [name] of args*/
|
||||
ngx_flag_t file_ext:1;
|
||||
/* matched within the 'NAME' */
|
||||
ngx_flag_t target_name:1;
|
||||
|
||||
ngx_str_t *name;
|
||||
ngx_http_rule_t *rule;
|
||||
} ngx_http_matched_rule_t;
|
||||
|
||||
/*
|
||||
** Context structure
|
||||
*/
|
||||
typedef struct
|
||||
{
|
||||
ngx_array_t *special_scores;
|
||||
ngx_int_t score;
|
||||
/* blocking flags */
|
||||
ngx_flag_t log:1;
|
||||
ngx_flag_t block:1;
|
||||
ngx_flag_t allow:1;
|
||||
ngx_flag_t drop:1;
|
||||
/* state */
|
||||
ngx_flag_t wait_for_body:1;
|
||||
ngx_flag_t ready:1;
|
||||
ngx_flag_t over:1;
|
||||
/* matched rules */
|
||||
ngx_array_t *matched;
|
||||
/* runtime flags (modifiers) */
|
||||
ngx_flag_t learning:1;
|
||||
ngx_flag_t enabled:1;
|
||||
ngx_flag_t post_action:1;
|
||||
ngx_flag_t extensive_log:1;
|
||||
/* did libinjection sql/xss matched ? */
|
||||
ngx_flag_t libinjection_sql:1;
|
||||
ngx_flag_t libinjection_xss:1;
|
||||
} ngx_http_request_ctx_t;
|
||||
|
||||
/*
|
||||
** this structure is used only for json parsing.
|
||||
*/
|
||||
typedef struct ngx_http_nx_json_s {
|
||||
ngx_str_t json;
|
||||
u_char *src;
|
||||
ngx_int_t off, len;
|
||||
u_char c;
|
||||
int depth;
|
||||
ngx_http_request_t *r;
|
||||
ngx_http_request_ctx_t *ctx;
|
||||
ngx_str_t ckey;
|
||||
ngx_http_dummy_main_conf_t *main_cf;
|
||||
ngx_http_dummy_loc_conf_t *loc_cf;
|
||||
} ngx_json_t;
|
||||
|
||||
|
||||
|
||||
#define TOP_DENIED_URL_T "DeniedUrl"
|
||||
#define TOP_LEARNING_FLAG_T "LearningMode"
|
||||
#define TOP_ENABLED_FLAG_T "SecRulesEnabled"
|
||||
#define TOP_DISABLED_FLAG_T "SecRulesDisabled"
|
||||
#define TOP_CHECK_RULE_T "CheckRule"
|
||||
#define TOP_BASIC_RULE_T "BasicRule"
|
||||
#define TOP_MAIN_BASIC_RULE_T "MainRule"
|
||||
#define TOP_LIBINJECTION_SQL_T "LibInjectionSql"
|
||||
#define TOP_LIBINJECTION_XSS_T "LibInjectionXss"
|
||||
|
||||
/* nginx-style names */
|
||||
#define TOP_DENIED_URL_N "denied_url"
|
||||
#define TOP_LEARNING_FLAG_N "learning_mode"
|
||||
#define TOP_ENABLED_FLAG_N "rules_enabled"
|
||||
#define TOP_DISABLED_FLAG_N "rules_disabled"
|
||||
#define TOP_CHECK_RULE_N "check_rule"
|
||||
#define TOP_BASIC_RULE_N "basic_rule"
|
||||
#define TOP_MAIN_BASIC_RULE_N "main_rule"
|
||||
#define TOP_LIBINJECTION_SQL_N "libinjection_sql"
|
||||
#define TOP_LIBINJECTION_XSS_N "libinjection_xss"
|
||||
|
||||
|
||||
/*possible 'tokens' in rule */
|
||||
#define ID_T "id:"
|
||||
#define SCORE_T "s:"
|
||||
#define MSG_T "msg:"
|
||||
#define RX_T "rx:"
|
||||
#define STR_T "str:"
|
||||
#define MATCH_ZONE_T "mz:"
|
||||
#define WHITELIST_T "wl:"
|
||||
#define LIBINJ_XSS_T "d:libinj_xss"
|
||||
#define LIBINJ_SQL_T "d:libinj_sql"
|
||||
#define NEGATIVE_T "negative"
|
||||
|
||||
/*
|
||||
** name of hardcoded variables to
|
||||
** change behavior of naxsi at runtime
|
||||
*/
|
||||
#define RT_EXTENSIVE_LOG "naxsi_extensive_log"
|
||||
#define RT_ENABLE "naxsi_flag_enable"
|
||||
#define RT_LEARNING "naxsi_flag_learning"
|
||||
#define RT_POST_ACTION "naxsi_flag_post_action"
|
||||
#define RT_LIBINJECTION_SQL "naxsi_flag_libinjection_sql"
|
||||
#define RT_LIBINJECTION_XSS "naxsi_flag_libinjection_xss"
|
||||
|
||||
|
||||
/*
|
||||
** To avoid getting DoS'ed, define max depth
|
||||
** for JSON parser, as it is recursive
|
||||
*/
|
||||
#define JSON_MAX_DEPTH 10
|
||||
|
||||
|
||||
void *ngx_http_dummy_cfg_parse_one_rule(ngx_conf_t *cf,
|
||||
ngx_str_t *value,
|
||||
ngx_http_rule_t *rule,
|
||||
ngx_int_t nb_elem);
|
||||
char *strfaststr(unsigned char *haystack, unsigned int hl,
|
||||
unsigned char *needle, unsigned int nl);
|
||||
char *strnchr(const char *s, int c, int len);
|
||||
ngx_int_t ngx_http_dummy_create_hashtables_n(ngx_http_dummy_loc_conf_t *dlc,
|
||||
ngx_conf_t *cf);
|
||||
void ngx_http_dummy_data_parse(ngx_http_request_ctx_t *ctx,
|
||||
ngx_http_request_t *r);
|
||||
ngx_int_t ngx_http_output_forbidden_page(ngx_http_request_ctx_t *ctx,
|
||||
ngx_http_request_t *r);
|
||||
int nx_check_ids(ngx_int_t match_id, ngx_array_t *wl_ids);
|
||||
int naxsi_unescape(ngx_str_t *str);
|
||||
|
||||
void ngx_http_dummy_json_parse(ngx_http_request_ctx_t *ctx,
|
||||
ngx_http_request_t *r,
|
||||
u_char *src,
|
||||
u_int len);
|
||||
|
||||
void ngx_http_libinjection(ngx_pool_t *pool,
|
||||
ngx_str_t *name,
|
||||
ngx_str_t *value,
|
||||
ngx_http_request_ctx_t *ctx,
|
||||
ngx_http_request_t *req,
|
||||
enum DUMMY_MATCH_ZONE zone);
|
||||
/*
|
||||
** JSON parsing prototypes.
|
||||
*/
|
||||
ngx_int_t ngx_http_nx_json_forward(ngx_json_t *js) ;
|
||||
ngx_int_t ngx_http_nx_json_seek(ngx_json_t *js, unsigned char seek);
|
||||
ngx_int_t ngx_http_nx_json_quoted(ngx_json_t *js, ngx_str_t *ve);
|
||||
ngx_int_t ngx_http_nx_json_array(ngx_json_t *js);
|
||||
ngx_int_t ngx_http_nx_json_val(ngx_json_t *js);
|
||||
ngx_int_t ngx_http_nx_json_obj(ngx_json_t *js);
|
||||
|
||||
|
||||
/*
|
||||
** naxsi_runtime
|
||||
**
|
||||
*/
|
||||
|
||||
void ngx_http_dummy_update_current_ctx_status(ngx_http_request_ctx_t *ctx,
|
||||
ngx_http_dummy_loc_conf_t *cf,
|
||||
ngx_http_request_t *r);
|
||||
int ngx_http_process_basic_rule_buffer(ngx_str_t *str, ngx_http_rule_t *rl,
|
||||
ngx_int_t *match);
|
||||
void ngx_http_dummy_payload_handler(ngx_http_request_t *r);
|
||||
int ngx_http_basestr_ruleset_n(ngx_pool_t *pool,
|
||||
ngx_str_t *name,
|
||||
ngx_str_t *value,
|
||||
ngx_array_t *rules,
|
||||
ngx_http_request_t *req,
|
||||
ngx_http_request_ctx_t *ctx,
|
||||
enum DUMMY_MATCH_ZONE zone);
|
||||
void ngx_http_dummy_body_parse(ngx_http_request_ctx_t *ctx,
|
||||
ngx_http_request_t *r,
|
||||
ngx_http_dummy_loc_conf_t *cf,
|
||||
ngx_http_dummy_main_conf_t *main_cf);
|
||||
void naxsi_log_offending(ngx_str_t *name, ngx_str_t *val, ngx_http_request_t *req,
|
||||
ngx_http_rule_t *rule, enum DUMMY_MATCH_ZONE zone, ngx_int_t target_name);
|
||||
|
||||
int ngx_http_apply_rulematch_v_n(ngx_http_rule_t *r, ngx_http_request_ctx_t *ctx,
|
||||
ngx_http_request_t *req, ngx_str_t *name,
|
||||
ngx_str_t *value, enum DUMMY_MATCH_ZONE zone,
|
||||
ngx_int_t nb_match, ngx_int_t target_name);
|
||||
|
||||
|
||||
|
||||
/*
|
||||
** externs for internal rules that requires it.
|
||||
*/
|
||||
extern ngx_http_rule_t *nx_int__libinject_sql;
|
||||
extern ngx_http_rule_t *nx_int__libinject_xss;
|
||||
|
||||
/*libinjection_xss wrapper not exported by libinject_xss.h.*/
|
||||
int libinjection_xss(const char* s, size_t len);
|
||||
|
||||
|
||||
#endif
|
||||
|
||||
Reference in New Issue
Block a user