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ngx_http_waf_module.c
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ngx_http_waf_module.c
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// Copyright (C) vislee
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_md5.h>
#include "libinjection/libinjection.h"
#include "libinjection/libinjection_sqli.h"
#ifdef NGX_WAF_MAGIC
#include <magic.h>
#endif
#ifdef NGX_WAF_HS
#include <hs/hs.h>
#include <hs/hs_runtime.h>
#endif
#ifdef NGX_DEBUG
#include <assert.h>
#endif
/*
* id 规则的标识，白名单和日志使用。
* str 字符串匹配
* sc 规则记分
* z 匹配区域
* * * * *
* security_rule id:1001 "str:xxx" "s:$TT:1,$QQ:2" "z:ARGS|V_HEADERS:cookie";
* -> ARGS:1001
* -> V_HEADERS:cookie:1001
*
* security_rule id:1002 "str:yyy" "sc:$TT:2,$QQ:2" "z:V_ARGS:foo|V_ARGS:bar|HEADERS";
* -> V_ARGS:foo: 1002
* -> HEADERS:1002
*
* security_loc_rule "wl:1001,1002" "z:V_ARGS:foo|HEADERS";
*
* -> 1001: $ARGS ...
* $HEADERS ...
* -> 1002: $ARGS ...
* $HEADERS ...
*
* security_check "$TTT > 5" BLOCK;
*
* =>:
* ARGS:1001
* |-> ARGS
|->wl: V_ARGS:foo, V_ARGS:bar
* HEADERS:1002
* |-> HEADERS
* |-> wl:HEADERS
*
* ARGS_VAR:1002
* |-> V_ARGS:foo
* |-> V_ARGS:bar
* |-> wl:V_ARGS:foo
* HEADERS_VAR:1001
* |-> V_HEADERS:cookie
* |-> wl:HEADERS
*
*/
#define NGX_HTTP_WAF_MAX_LOG_STR 4096
#define NGX_HTTP_WAF_SYSLOG_MAX_STR \
NGX_HTTP_WAF_MAX_LOG_STR + sizeof("<255>Jan 01 00:00:00 ") - 1 \
+ (NGX_MAXHOSTNAMELEN - 1) + 1 /* space */ \
+ 32 /* tag */ + 2 /* colon, space */
// rule status
// action flag
// ngx_http_waf_rule_t->sts
#define NGX_HTTP_WAF_STS_RULE_ACTION 0x0FF00000
#define NGX_HTTP_WAF_STS_RULE_LOG 0x00100000
#define NGX_HTTP_WAF_STS_RULE_BLOCK 0x00200000
#define NGX_HTTP_WAF_STS_RULE_DROP 0x00400000
#define NGX_HTTP_WAF_STS_RULE_ALLOW 0x00800000
#define NGX_HTTP_WAF_STS_RULE_DONE 0x00E00000 // (BLOCK|DROP|ALLOW)
// #define NGX_HTTP_WAF_STS_RULE_NULL 0x01800000
// #define NGX_HTTP_WAF_STS_RULE_NULL 0x02800000
#define NGX_HTTP_WAF_STS_RULE_MZ_WL 0x04000000
#define NGX_HTTP_WAF_STS_RULE_VAR 0x08000000
#define NGX_HTTP_WAF_STS_MZ_SIGN 0xF0000000
#define NGX_HTTP_WAF_STS_MZ_COUNT 0x10000000
#define NGX_HTTP_WAF_STS_MZ_KEY 0x20000000
#define NGX_HTTP_WAF_STS_MZ_VAL 0x40000000
#define NGX_HTTP_WAF_STS_MZ_KV 0x60000000
#define NGX_HTTP_WAF_STS_RULE_INVALID 0x80000000
#define NGX_HTTP_WAF_STS_RULE_WL_INVALID 0x80000001
#define NGX_HTTP_WAF_STS_RULE_SC_INVALID 0x80000002
// NGX_HTTP_WAF_STS_MZ_KEY & NGX_HTTP_WAF_STS_RULE_MZ_WL
#define NGX_HTTP_WAF_STS_RULE_MZ_KEY_WL 0x24000000
// NGX_HTTP_WAF_STS_MZ_VAL & NGX_HTTP_WAF_STS_RULE_MZ_WL
#define NGX_HTTP_WAF_STS_RULE_MZ_VAL_WL 0x44000000
#define ngx_http_waf_ctx_copy_act(dst_act, src_act) \
((dst_act) |= (src_act) & NGX_HTTP_WAF_STS_RULE_ACTION)
#define ngx_http_waf_wl_copy_mz(dst_mz, src_mz) \
(dst_mz) |= (NGX_HTTP_WAF_STS_RULE_MZ_WL \
| ((src_mz) & NGX_HTTP_WAF_STS_MZ_KV));
#define ngx_http_waf_rule_invalid(sts) \
((sts) & NGX_HTTP_WAF_STS_RULE_INVALID)
#define ngx_http_waf_rule_set_wl_invalid(sts) \
((sts) |= NGX_HTTP_WAF_STS_RULE_WL_INVALID)
#define ngx_http_waf_rule_set_sc_invalid(sts) \
((sts) |= NGX_HTTP_WAF_STS_RULE_SC_INVALID)
#define ngx_http_waf_rule_wl_mz_key(sts) \
((sts) & NGX_HTTP_WAF_STS_RULE_MZ_KEY_WL)
#define ngx_http_waf_rule_wl_mz_val(sts) \
((sts) & NGX_HTTP_WAF_STS_RULE_MZ_VAL_WL)
#define ngx_http_waf_score_is_done(flag) \
((flag) & NGX_HTTP_WAF_STS_RULE_DONE)
#define ngx_http_waf_sts_has_block(flag) \
((flag) & NGX_HTTP_WAF_STS_RULE_BLOCK)
#define ngx_http_waf_sts_act_set_block(flag) \
((flag) |= NGX_HTTP_WAF_STS_RULE_BLOCK)
#define ngx_http_waf_sts_has_drop(flag) \
((flag) & NGX_HTTP_WAF_STS_RULE_DROP)
#define ngx_http_waf_sts_has_var(flag) \
((flag) & NGX_HTTP_WAF_STS_RULE_VAR)
#define ngx_http_waf_sts_has_allow(flag) \
((flag) & NGX_HTTP_WAF_STS_RULE_ALLOW)
#define ngx_http_waf_act_set_var_block(flag) \
((flag) |= (NGX_HTTP_WAF_STS_RULE_BLOCK | NGX_HTTP_WAF_STS_RULE_VAR))
static char*
ngx_http_waf_get_act(ngx_uint_t flag) {
switch(flag & NGX_HTTP_WAF_STS_RULE_ACTION) {
case NGX_HTTP_WAF_STS_RULE_BLOCK: return "BLOCK";
case NGX_HTTP_WAF_STS_RULE_DROP: return "DROP";
case NGX_HTTP_WAF_STS_RULE_ALLOW: return "ALLOW";
default:
return "LOG";
}
return "LOG";
}
// 0xFFFFF
// match zone types
// ngx_http_waf_zone_t->flag
// general
#define NGX_HTTP_WAF_MZ_G 0x0300F
#define NGX_HTTP_WAF_MZ_G_URL 0x00001
#define NGX_HTTP_WAF_MZ_G_ARGS 0x00002
#define NGX_HTTP_WAF_MZ_G_HEADERS 0x00004
#define NGX_HTTP_WAF_MZ_G_BODY 0x00008
#define NGX_HTTP_WAF_MZ_G_RAW_BODY 0x01000
// specify variable
#define NGX_HTTP_WAF_MZ_VAR 0x040F0
#define NGX_HTTP_WAF_MZ_VAR_URL 0x00010
#define NGX_HTTP_WAF_MZ_VAR_ARGS 0x00020
#define NGX_HTTP_WAF_MZ_VAR_HEADERS 0x00040
#define NGX_HTTP_WAF_MZ_VAR_BODY 0x00080
// regex
#define NGX_HTTP_WAF_MZ_X 0x08F00
#define NGX_HTTP_WAF_MZ_X_URL 0x00100
#define NGX_HTTP_WAF_MZ_X_ARGS 0x00200
#define NGX_HTTP_WAF_MZ_X_HEADERS 0x00400
#define NGX_HTTP_WAF_MZ_X_BODY 0x00800
#define NGX_HTTP_WAF_MZ_URL 0x00111
#define NGX_HTTP_WAF_MZ_ARGS 0x00222
#define NGX_HTTP_WAF_MZ_HEADERS 0x00444
#define NGX_HTTP_WAF_MZ_BODY 0x01888
#define NGX_HTTP_WAF_MZ_FILE_BODY 0x0E000
// multipart/form-data filename= content=
#define NGX_HTTP_WAF_MZ_G_FILE_BODY 0x02000
// #define NGX_HTTP_WAF_MZ_VAR_FILE_BODY 0x04000
#define NGX_HTTP_WAF_MZ_X_FILE_BODY 0x08000
#define ngx_http_waf_mz_gt(one, two) \
((one & ((two & NGX_HTTP_WAF_MZ_VAR) >> 4)) \
|| (one & ((two & NGX_HTTP_WAF_MZ_VAR) >> 8)) \
|| ((one & NGX_HTTP_WAF_MZ_G) == (two & NGX_HTTP_WAF_MZ_G) \
&& (one & NGX_HTTP_WAF_MZ_G) != 0))
#define ngx_http_waf_mz_is_general(flag) \
((flag) & NGX_HTTP_WAF_MZ_G)
#define ngx_http_waf_mz_is_regex(flag) \
((flag) & NGX_HTTP_WAF_MZ_X)
#define ngx_http_waf_mz_key(flag) \
((flag) & NGX_HTTP_WAF_STS_MZ_KEY)
#define ngx_http_waf_mz_val(flag) \
((flag) & NGX_HTTP_WAF_STS_MZ_VAL)
typedef struct ngx_http_waf_log_s ngx_http_waf_log_t;
typedef struct ngx_http_waf_rule_s ngx_http_waf_rule_t;
typedef struct ngx_http_waf_public_rule_s ngx_http_waf_public_rule_t;
typedef void (*ngx_http_waf_log_write_pt) (ngx_http_waf_log_t *log,
u_char *buf, size_t len);
typedef ngx_int_t (*ngx_http_waf_rule_match_pt)(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
typedef ngx_int_t (*ngx_http_waf_rule_decode_pt)(ngx_http_request_t *r,
ngx_str_t *dst, ngx_str_t *src, ngx_uint_t destory);
// for check rule
typedef struct ngx_http_waf_check_s {
ngx_uint_t idx; /* the ctx check array index */
ngx_str_t tag; /* check socre tag */
ngx_int_t score; /* the rule socre */
ngx_int_t threshold; /* the check rule threshold*/
ngx_uint_t action_flag; /* the check rule action */
} ngx_http_waf_check_t;
typedef struct ngx_http_waf_log_ctx_s {
ngx_str_t str;
ngx_http_waf_rule_t *rule;
ngx_int_t score;
} ngx_http_waf_log_ctx_t;
// the rule score
typedef struct ngx_http_waf_score_s {
ngx_str_t tag;
ngx_int_t score;
ngx_array_t *log_ctx; /* ngx_http_waf_log_ctx_t */
} ngx_http_waf_score_t;
// the rule
struct ngx_http_waf_public_rule_s {
ngx_int_t id;
ngx_str_t str;
#ifdef NGX_WAF_HS
hs_database_t *db;
hs_scratch_t *scratch;
#else
ngx_regex_t *regex;
#endif
ngx_array_t *scores; /* ngx_http_waf_score_t. maybe null */
ngx_array_t *decode_handlers;
ngx_http_waf_rule_match_pt handler;
unsigned not:1;
};
typedef struct ngx_http_waf_zone_s {
ngx_uint_t flag; /* match zone types */
ngx_str_t name; /* the specify variable for match zone */
#ifdef NGX_WAF_HS
hs_database_t *db;
hs_scratch_t *scratch;
#else
ngx_regex_t *regex;
#endif
// ngx_str_t spec_url_suffix; // TODO
} ngx_http_waf_zone_t;
// for parse rules
typedef struct ngx_http_waf_rule_opt_s {
ngx_http_waf_public_rule_t *p_rule;
ngx_array_t *wl_ids; /* ngx_int_t */
ngx_array_t *m_zones; /* ngx_http_waf_zone_t */
} ngx_http_waf_rule_opt_t;
struct ngx_http_waf_rule_s {
ngx_http_waf_public_rule_t *p_rule; /* opt->p_rule */
ngx_http_waf_zone_t *m_zone; /* opt->m_zones[x] */
ngx_array_t *wl_zones; /* ngx_http_waf_zone_t */
ngx_array_t *score_checks; /* ngx_http_waf_check_t*/
// rule status:
//include rule invalid, rule action, rule withelist type ...
ngx_uint_t sts;
};
typedef struct ngx_http_waf_whitelist_s {
ngx_int_t id; /* opt->wl_ids[x] */
ngx_array_t *url_zones; /* ngx_http_waf_zone_t* */
ngx_array_t *args_zones; /* opt->m_zones */
ngx_array_t *headers_zones;
ngx_array_t *body_zones;
ngx_array_t *body_file_zones;
// not specify the match zone.
unsigned all_zones:1;
} ngx_http_waf_whitelist_t;
typedef struct {
// ngx_http_waf_rule_t
// general and regex
ngx_array_t *url;
ngx_array_t *args;
ngx_array_t *headers;
ngx_array_t *body;
ngx_array_t *raw_body;
ngx_array_t *body_file;
// ngx_http_waf_rule_t
// specify variable
ngx_array_t *url_var;
ngx_array_t *args_var;
ngx_array_t *headers_var;
ngx_array_t *body_var;
} ngx_http_waf_main_conf_t;
struct ngx_http_waf_log_s {
ngx_uint_t off;
ngx_uint_t flat;
ngx_open_file_t *file;
ngx_http_waf_log_write_pt writer;
void *wdata;
};
typedef struct {
ngx_flag_t security_waf;
ngx_http_waf_log_t *log;
ngx_msec_t security_timeout;
ngx_array_t *check_rules; /* ngx_http_waf_check_t */
ngx_array_t *whitelists; /* ngx_http_waf_whitelist_t */
// ngx_http_waf_rule_t
// include general and regex rules
ngx_array_t *url;
ngx_array_t *args;
ngx_array_t *headers;
ngx_array_t *body;
ngx_array_t *body_file;
ngx_array_t *raw_body;
// ngx_http_waf_rule_t
// only specify variable rules
ngx_array_t *url_var;
ngx_hash_t url_var_hash;
ngx_array_t *args_var;
ngx_hash_t args_var_hash;
ngx_array_t *headers_var;
ngx_hash_t headers_var_hash;
ngx_array_t *body_var;
ngx_hash_t body_var_hash;
} ngx_http_waf_loc_conf_t;
typedef struct ngx_http_waf_ctx_s {
ngx_array_t *scores; /* ngx_http_waf_score_t */
ngx_http_waf_log_ctx_t *logc;
ngx_uint_t status;
unsigned wait_body:1;
unsigned check_done:1;
unsigned interrupt:1;
} ngx_http_waf_ctx_t;
typedef struct ngx_http_waf_add_rule_s {
ngx_uint_t flag;
ngx_uint_t offset;
ngx_uint_t loc_offset;
ngx_int_t (*handler)(ngx_conf_t *cf, ngx_http_waf_public_rule_t *pr,
ngx_http_waf_zone_t *mz,
void *conf, ngx_uint_t offset);
} ngx_http_waf_add_rule_t;
typedef struct ngx_http_waf_add_wl_part_s {
ngx_uint_t flag;
ngx_uint_t offset;
ngx_int_t (*handler)(ngx_conf_t *cf, ngx_http_waf_zone_t *mz,
void *conf, ngx_uint_t offset);
} ngx_http_waf_add_wl_part_t;
typedef struct ngx_http_waf_rule_decode_s {
ngx_str_t suffix;
ngx_http_waf_rule_decode_pt handler;
} ngx_http_waf_rule_decode_t;
typedef struct ngx_http_waf_rule_parser_s ngx_http_waf_rule_parser_t;
typedef ngx_int_t (*ngx_http_waf_rule_item_parse_pt)(ngx_conf_t *cf,
ngx_str_t *str, ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
struct ngx_http_waf_rule_parser_s {
ngx_str_t prefix;
ngx_http_waf_rule_item_parse_pt handler;
};
/**
* include: line:2-5: kv include k or v line:6-11: MZ_G include MZ_VAR or MZ_X
* equal: line:13-14 MZ==MZ and name==name
*/
#define ngx_http_waf_mz_ge(one, two) ( \
( \
( ((one)->flag&NGX_HTTP_WAF_STS_MZ_KV) \
& ((two)->flag&NGX_HTTP_WAF_STS_MZ_KV) ) \
&& ( ((one)->flag&NGX_HTTP_WAF_STS_MZ_KV) \
>= ((two)->flag&NGX_HTTP_WAF_STS_MZ_KV) ) \
&& ( ( (two)->flag < NGX_HTTP_WAF_MZ_G_RAW_BODY \
&& ((((one)->flag<<4)&(two)->flag) \
|| (((one)->flag<<8)&(two)->flag)) ) \
|| ( (two)->flag > NGX_HTTP_WAF_MZ_G_RAW_BODY \
&& ((((one)->flag<<1)&(two)->flag) \
|| (((one)->flag<<2)&(two)->flag)) ) ) \
) \
|| ( ((one)->flag == (two)->flag) && (one)->name.len == (two)->name.len \
&& ngx_strncmp((one)->name.data, (two)->name.data, (one)->name.len) == 0 )\
)
/**
* one: #ARGS or @ARGS
* two: ARGS
*/
#define ngx_http_waf_wl_mz(one, two) ( \
(((one)->flag & NGX_HTTP_WAF_MZ_G) == ((two)->flag & NGX_HTTP_WAF_MZ_G)) \
&& (((one)->flag & NGX_HTTP_WAF_STS_MZ_KV) != NGX_HTTP_WAF_STS_MZ_KV) \
&& (((two)->flag & NGX_HTTP_WAF_STS_MZ_KV) == NGX_HTTP_WAF_STS_MZ_KV) \
)
static ngx_int_t ngx_http_waf_init(ngx_conf_t *cf);
static ngx_int_t ngx_http_waf_handler(ngx_http_request_t *r);
static void *ngx_http_waf_create_main_conf(ngx_conf_t *cf);
static void *ngx_http_waf_create_loc_conf(ngx_conf_t *cf);
// static char *ngx_http_waf_init_main_conf(ngx_conf_t *cf, void *conf);
static char *ngx_http_waf_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
static char *ngx_http_waf_main_rule(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_waf_loc_rule(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_waf_check_rule(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_waf_set_log(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static void ngx_http_waf_syslog_writer(ngx_http_waf_log_t *log,
u_char *buf, size_t len);
static ngx_int_t ngx_http_waf_parse_rule(ngx_conf_t *cf,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_decode_base64(ngx_http_request_t *r,
ngx_str_t *dst, ngx_str_t *src, ngx_uint_t destory);
static ngx_int_t ngx_http_waf_decode_url(ngx_http_request_t *r,
ngx_str_t *dst, ngx_str_t *src, ngx_uint_t destory);
static ngx_int_t ngx_http_waf_parse_rule_id(ngx_conf_t *cf, ngx_str_t *str,
ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_parse_rule_str(ngx_conf_t *cf, ngx_str_t *str,
ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_parse_rule_score(ngx_conf_t *cf, ngx_str_t *str,
ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_parse_rule_note(ngx_conf_t *cf, ngx_str_t *str,
ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_parse_rule_zone(ngx_conf_t *cf, ngx_str_t *str,
ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_parse_rule_whitelist(ngx_conf_t *cf,
ngx_str_t *str, ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_parse_rule_libinj(ngx_conf_t *cf,
ngx_str_t *str, ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_parse_rule_libmagic(ngx_conf_t *cf,
ngx_str_t *str, ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_parse_rule_hash(ngx_conf_t *cf,
ngx_str_t *str, ngx_http_waf_rule_parser_t *parser,
ngx_http_waf_rule_opt_t *opt);
static ngx_int_t ngx_http_waf_add_rule_handler(ngx_conf_t *cf,
ngx_http_waf_public_rule_t *pr, ngx_http_waf_zone_t *mz,
void *conf, ngx_uint_t offset);
static ngx_int_t ngx_http_waf_add_wl_part_handler(ngx_conf_t *cf,
ngx_http_waf_zone_t *mz, void *wl, ngx_uint_t offset);
static ngx_int_t ngx_http_waf_rule_str_ge_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_str_le_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_str_ct_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_str_eq_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_str_startwith_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_str_endwith_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_str_rx_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_str_sqli_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_str_xss_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_magic_mimetype_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_hash_md5_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_hash_crc32_short_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_rule_hash_crc32_long_handler(
ngx_http_waf_public_rule_t *pr, ngx_str_t *s);
static ngx_int_t ngx_http_waf_check_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_conf_bitmask_t ngx_http_waf_rule_actions[] = {
{ngx_string("LOG"), NGX_HTTP_WAF_STS_RULE_LOG},
{ngx_string("BLOCK"), NGX_HTTP_WAF_STS_RULE_BLOCK},
{ngx_string("DROP"), NGX_HTTP_WAF_STS_RULE_DROP},
{ngx_string("ALLOW"), NGX_HTTP_WAF_STS_RULE_ALLOW},
{ngx_null_string, 0}
};
static ngx_conf_bitmask_t ngx_http_waf_rule_zone_item[] = {
{ ngx_string("URL"),
NGX_HTTP_WAF_MZ_G_URL|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("#URL"),
NGX_HTTP_WAF_MZ_G_URL|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("V_URL:"),
NGX_HTTP_WAF_MZ_VAR_URL|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("X_URL:"),
NGX_HTTP_WAF_MZ_X_URL|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("ARGS"),
NGX_HTTP_WAF_MZ_G_ARGS|NGX_HTTP_WAF_STS_MZ_KV },
{ ngx_string("@ARGS"),
(NGX_HTTP_WAF_MZ_G_ARGS|NGX_HTTP_WAF_STS_MZ_KEY) },
{ ngx_string("#ARGS"),
(NGX_HTTP_WAF_MZ_G_ARGS|NGX_HTTP_WAF_STS_MZ_VAL) },
// TODO: %ARGS args count.
{ ngx_string("V_ARGS:"),
NGX_HTTP_WAF_MZ_VAR_ARGS|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("X_ARGS:"),
NGX_HTTP_WAF_MZ_X_ARGS|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("HEADERS"),
NGX_HTTP_WAF_MZ_G_HEADERS|NGX_HTTP_WAF_STS_MZ_KV },
{ ngx_string("@HEADERS"),
(NGX_HTTP_WAF_MZ_G_HEADERS|NGX_HTTP_WAF_STS_MZ_KEY) },
{ ngx_string("#HEADERS"),
(NGX_HTTP_WAF_MZ_G_HEADERS|NGX_HTTP_WAF_STS_MZ_VAL) },
{ ngx_string("V_HEADERS:"),
NGX_HTTP_WAF_MZ_VAR_HEADERS|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("X_HEADERS:"),
NGX_HTTP_WAF_MZ_X_HEADERS|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("BODY"),
NGX_HTTP_WAF_MZ_G_BODY|NGX_HTTP_WAF_STS_MZ_KV },
{ ngx_string("@BODY"),
NGX_HTTP_WAF_MZ_G_BODY|NGX_HTTP_WAF_STS_MZ_KEY },
{ ngx_string("#BODY"),
NGX_HTTP_WAF_MZ_G_BODY|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("#RAW_BODY"),
NGX_HTTP_WAF_MZ_G_RAW_BODY|NGX_HTTP_WAF_STS_MZ_VAL },
// TODO: file
{ ngx_string("#FILE"),
NGX_HTTP_WAF_MZ_G_FILE_BODY|NGX_HTTP_WAF_STS_MZ_VAL },
// { ngx_string("V_FILE"),
// NGX_HTTP_WAF_MZ_VAR_FILE_BODY|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("X_FILE:"),
NGX_HTTP_WAF_MZ_X_FILE_BODY |NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("V_BODY:"),
NGX_HTTP_WAF_MZ_VAR_BODY|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_string("X_BODY:"),
NGX_HTTP_WAF_MZ_X_BODY|NGX_HTTP_WAF_STS_MZ_VAL },
{ ngx_null_string, 0 }
};
static ngx_http_waf_add_rule_t ngx_http_waf_conf_add_rules[] = {
{ NGX_HTTP_WAF_MZ_G_URL|NGX_HTTP_WAF_MZ_X_URL,
offsetof(ngx_http_waf_main_conf_t, url),
offsetof(ngx_http_waf_loc_conf_t, url),
ngx_http_waf_add_rule_handler },
{ NGX_HTTP_WAF_MZ_G_ARGS|NGX_HTTP_WAF_MZ_X_ARGS,
offsetof(ngx_http_waf_main_conf_t, args),
offsetof(ngx_http_waf_loc_conf_t, args),
ngx_http_waf_add_rule_handler },
{ NGX_HTTP_WAF_MZ_G_HEADERS|NGX_HTTP_WAF_MZ_X_HEADERS,
offsetof(ngx_http_waf_main_conf_t, headers),
offsetof(ngx_http_waf_loc_conf_t, headers),
ngx_http_waf_add_rule_handler },
{ NGX_HTTP_WAF_MZ_G_BODY|NGX_HTTP_WAF_MZ_X_BODY,
offsetof(ngx_http_waf_main_conf_t, body),
offsetof(ngx_http_waf_loc_conf_t, body),
ngx_http_waf_add_rule_handler },
{ NGX_HTTP_WAF_MZ_G_RAW_BODY,
offsetof(ngx_http_waf_main_conf_t, raw_body),
offsetof(ngx_http_waf_loc_conf_t, raw_body),
ngx_http_waf_add_rule_handler },
{ NGX_HTTP_WAF_MZ_G_FILE_BODY|NGX_HTTP_WAF_MZ_X_FILE_BODY,
offsetof(ngx_http_waf_main_conf_t, body_file),
offsetof(ngx_http_waf_loc_conf_t, body_file),
ngx_http_waf_add_rule_handler },
{ NGX_HTTP_WAF_MZ_VAR_URL,
offsetof(ngx_http_waf_main_conf_t, url_var),
offsetof(ngx_http_waf_loc_conf_t, url_var),
ngx_http_waf_add_rule_handler },
{ NGX_HTTP_WAF_MZ_VAR_ARGS,
offsetof(ngx_http_waf_main_conf_t, args_var),
offsetof(ngx_http_waf_loc_conf_t, args_var),
ngx_http_waf_add_rule_handler },
{ NGX_HTTP_WAF_MZ_VAR_HEADERS,
offsetof(ngx_http_waf_main_conf_t, headers_var),
offsetof(ngx_http_waf_loc_conf_t, headers_var),
ngx_http_waf_add_rule_handler },
{ NGX_HTTP_WAF_MZ_VAR_BODY,
offsetof(ngx_http_waf_main_conf_t, body_var),
offsetof(ngx_http_waf_loc_conf_t, body_var),
ngx_http_waf_add_rule_handler },
{ 0,
0,
0,
NULL }
};
static ngx_http_waf_add_wl_part_t ngx_http_waf_conf_add_wl[] = {
{ NGX_HTTP_WAF_MZ_URL,
offsetof(ngx_http_waf_whitelist_t, url_zones),
ngx_http_waf_add_wl_part_handler },
{ NGX_HTTP_WAF_MZ_ARGS,
offsetof(ngx_http_waf_whitelist_t, args_zones),
ngx_http_waf_add_wl_part_handler},
{ NGX_HTTP_WAF_MZ_HEADERS,
offsetof(ngx_http_waf_whitelist_t, headers_zones),
ngx_http_waf_add_wl_part_handler},
{ NGX_HTTP_WAF_MZ_BODY,
offsetof(ngx_http_waf_whitelist_t, body_zones),
ngx_http_waf_add_wl_part_handler},
{ NGX_HTTP_WAF_MZ_G_FILE_BODY,
offsetof(ngx_http_waf_whitelist_t, body_file_zones),
ngx_http_waf_add_wl_part_handler},
{0, 0, NULL}
};
static ngx_http_waf_rule_decode_t ngx_http_waf_rule_decode[] = {
{ngx_string("base64"), ngx_http_waf_decode_base64},
{ngx_string("url"), ngx_http_waf_decode_url},
{ngx_null_string, NULL}
};
static ngx_http_waf_rule_parser_t ngx_http_waf_rule_parser_item[] = {
{ngx_string("id:"), ngx_http_waf_parse_rule_id},
{ngx_string("s:"), ngx_http_waf_parse_rule_score},
{ngx_string("str:"), ngx_http_waf_parse_rule_str},
{ngx_string("libinj:"), ngx_http_waf_parse_rule_libinj},
{ngx_string("libmagic:"), ngx_http_waf_parse_rule_libmagic},
{ngx_string("hash:"), ngx_http_waf_parse_rule_hash},
{ngx_string("z:"), ngx_http_waf_parse_rule_zone},
{ngx_string("wl:"), ngx_http_waf_parse_rule_whitelist},
{ngx_string("note:"), ngx_http_waf_parse_rule_note},
{ngx_null_string, NULL}
};
static ngx_command_t ngx_http_waf_commands[] = {
{ ngx_string("security_rule"),
NGX_HTTP_MAIN_CONF|NGX_CONF_1MORE,
ngx_http_waf_main_rule,
NGX_HTTP_MAIN_CONF_OFFSET,
0,
NULL },
{ ngx_string("security_loc_rule"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF|NGX_CONF_1MORE,
ngx_http_waf_loc_rule,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("security_check"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF|NGX_CONF_TAKE2,
ngx_http_waf_check_rule,
NGX_HTTP_LOC_CONF_OFFSET,
0,
&ngx_http_waf_rule_actions },
{ ngx_string("security_waf"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_waf_loc_conf_t, security_waf),
NULL },
{ ngx_string("security_log"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF|NGX_CONF_TAKE12,
ngx_http_waf_set_log,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("security_timeout"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_waf_loc_conf_t, security_timeout),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_waf_module_ctx = {
NULL, /* preconfiguration */
ngx_http_waf_init, /* postconfiguration */
ngx_http_waf_create_main_conf, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_waf_create_loc_conf, /* create location configuration */
ngx_http_waf_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_http_waf_module = {
NGX_MODULE_V1,
&ngx_http_waf_module_ctx, /* module context */
ngx_http_waf_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
//-- init -------------------
static void *
ngx_http_waf_create_main_conf(ngx_conf_t *cf)
{
ngx_http_waf_main_conf_t *wmcf;
wmcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_waf_main_conf_t));
if (wmcf == NULL) {
return NULL;
}
return wmcf;
}
static void *
ngx_http_waf_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_waf_loc_conf_t *wlcf;
wlcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_waf_loc_conf_t));
if (wlcf == NULL) {
return NULL;
}
wlcf->security_waf = NGX_CONF_UNSET;
wlcf->security_timeout = NGX_CONF_UNSET_MSEC;
wlcf->log = NULL;
return wlcf;
}
// -- public ---------------
static u_char *
ngx_strpbrk(u_char *b, u_char *e, char *s) {
u_char *p = b;
while (p < e) {
if (ngx_strchr(s, *p) != NULL) {
return p;
}
p++;
}
return NULL;
}
static u_char *
ngx_memnstr(u_char *s1, char *s2, size_t len)
{
u_char c1, c2;
size_t n;
c2 = *(u_char *) s2++;
n = ngx_strlen(s2);
do {
do {
if (len-- == 0) {
return NULL;
}
c1 = *s1++;
} while (c1 != c2);
if (n > len) {
return NULL;
}
} while (ngx_memcmp((char *)s1, s2, n) != 0);
return --s1;
}
static void
ngx_http_waf_unescape_uri(u_char **dst, u_char **src, size_t size,
ngx_uint_t type)
{
u_char *d, *s, ch, c, decoded;
enum {
sw_usual = 0,
sw_quoted,
sw_quoted_second
} state;
d = *dst;
s = *src;
state = 0;
decoded = 0;
while (size--) {
ch = *s++;
switch (state) {
case sw_usual:
if (ch == '?'
&& (type & (NGX_UNESCAPE_URI|NGX_UNESCAPE_REDIRECT)))
{
*d++ = ch;
goto done;
}
if (ch == '%') {
state = sw_quoted;
break;
}
if (ch == '+') {
*d++ = ' ';
break;
}
*d++ = ch;
break;
case sw_quoted:
if (ch >= '0' && ch <= '9') {
decoded = (u_char) (ch - '0');
state = sw_quoted_second;
break;
}
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'f') {
decoded = (u_char) (c - 'a' + 10);
state = sw_quoted_second;
break;
}
/* the invalid quoted character */
state = sw_usual;
*d++ = ch;
break;
case sw_quoted_second:
state = sw_usual;
if (ch >= '0' && ch <= '9') {
ch = (u_char) ((decoded << 4) + ch - '0');
if (type & NGX_UNESCAPE_REDIRECT) {
if (ch > '%' && ch < 0x7f) {
*d++ = ch;
break;
}
*d++ = '%'; *d++ = *(s - 2); *d++ = *(s - 1);
break;
}
*d++ = ch;
break;
}
c = (u_char) (ch | 0x20);
if (c >= 'a' && c <= 'f') {
ch = (u_char) ((decoded << 4) + c - 'a' + 10);
if (type & NGX_UNESCAPE_URI) {
if (ch == '?') {
*d++ = ch;
goto done;
}
*d++ = ch;
break;
}
if (type & NGX_UNESCAPE_REDIRECT) {
if (ch == '?') {
*d++ = ch;
goto done;
}
if (ch > '%' && ch < 0x7f) {
*d++ = ch;
break;
}
*d++ = '%'; *d++ = *(s - 2); *d++ = *(s - 1);
break;
}
*d++ = ch;
break;
}
/* the invalid quoted character */
break;
}