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naxsi_runtime.c
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naxsi_runtime.c
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// SPDX-FileCopyrightText: 2016-2019, Thibault 'bui' Koechlin <tko@nbs-system.com>
// SPDX-License-Identifier: GPL-3.0-or-later
#include <ngx_config.h>
#include <naxsi.h>
#include <naxsi_macros.h>
#include <naxsi_net.h>
/* used to store locations during the configuration time.
then, accessed by the hashtable building feature during "init" time. */
/*
** Static defined rules struct for internal rules.
** We use those to be able to call is_rule_whitelisted_n() on those
** rules at any time ;)
*/
// clang-format off
#define InternalRule(var_name, rule_id, block, drop) \
ngx_http_rule_t var_name = { \
/*type*/ 0, /*whitelist flag*/ 0, \
/*wl_id ptr*/ NULL, /*rule_id*/ rule_id, \
/*log_msg*/ NULL, /*score*/ 0, \
/*sscores*/ NULL, \
/*block*/ block, /*allow*/ 0, \
/*drop*/ drop, /*log*/ 0, \
/*br ptrs*/ NULL \
}
InternalRule(nx_int__weird_request, 1, 1, 0);
InternalRule(nx_int__big_request, 2, 1, 0);
InternalRule(nx_int__uncommon_hex_encoding, 10, 1, 0);
InternalRule(nx_int__uncommon_content_type, 11, 1, 0);
InternalRule(nx_int__uncommon_url, 12, 1, 0);
InternalRule(nx_int__uncommon_post_format, 13, 1, 0);
InternalRule(nx_int__uncommon_post_boundary, 14, 1, 0);
InternalRule(nx_int__invalid_json, 15, 1, 0);
InternalRule(nx_int__empty_post_body, 16, 1, 0);
InternalRule(nx_int__libinject_sql, 17, 1, 0);
InternalRule(nx_int__libinject_xss, 18, 1, 0);
InternalRule(nx_int__no_rules, 19, 0, 1);
InternalRule(nx_int__bad_utf8, 20, 0, 1);
InternalRule(nx_int__illegal_host_header, 21, 0, 1);
// clang-format on
#define naxsi_error_fatal(ctx, r, ...) \
do { \
if (ctx) \
ctx->block = 1; \
if (ctx) \
ctx->drop = 1; \
ngx_log_debug(NGX_LOG_DEBUG_HTTP, \
r->connection->log, \
0, \
"XX-******** NGINX NAXSI INTERNAL ERROR ********"); \
ngx_log_debug(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, __VA_ARGS__); \
ngx_log_debug(NGX_LOG_DEBUG_HTTP, \
r->connection->log, \
0, \
"XX-func:%s file:%s line:%d", \
__func__, \
__FILE__, \
__LINE__); \
if (r && r->uri.data) \
ngx_log_debug(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "XX-uri:%s", r->uri.data); \
} while (0)
void
ngx_http_naxsi_update_current_ctx_status(ngx_http_request_ctx_t* ctx,
ngx_http_naxsi_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_naxsi_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,
naxsi_match_zone_t zone);
void
ngx_http_naxsi_body_parse(ngx_http_request_ctx_t* ctx,
ngx_http_request_t* r,
ngx_http_naxsi_loc_conf_t* cf,
ngx_http_naxsi_main_conf_t* main_cf);
void
ngx_http_naxsi_rawbody_parse(ngx_http_request_ctx_t* ctx,
ngx_http_request_t* r,
u_char* src,
u_int len);
unsigned char*
ngx_utf8_check(ngx_str_t* str);
#if NGX_PCRE2
/*
* variables to use pcre2
*/
static pcre2_match_data* ngx_pcre2_match_data;
static ngx_uint_t ngx_pcre2_match_data_size;
/*
* helper function to use pcre2
*/
ngx_int_t
ngx_pcre2_exec(ngx_regex_t* re,
unsigned char* str,
unsigned int len,
ngx_int_t tmp_idx,
int* captures,
ngx_uint_t size)
{
size_t* ov;
ngx_int_t rc;
ngx_uint_t n, i;
/*
* The pcre2_match() function might allocate memory for backtracking
* frames, typical allocations are from 40k and above. So the allocator
* is configured to do direct allocations from heap during matching.
*/
if (ngx_pcre2_match_data == NULL || size > ngx_pcre2_match_data_size) {
/*
* Allocate a match data if not yet allocated or smaller than
* needed.
*/
if (ngx_pcre2_match_data) {
pcre2_match_data_free(ngx_pcre2_match_data);
}
ngx_pcre2_match_data_size = size;
ngx_pcre2_match_data = pcre2_match_data_create(size / 3, NULL);
if (ngx_pcre2_match_data == NULL) {
rc = PCRE2_ERROR_NOMEMORY;
goto failed;
}
}
rc = pcre2_match(re, str, len, tmp_idx, 0, ngx_pcre2_match_data, NULL);
if (rc < 0) {
goto failed;
}
n = pcre2_get_ovector_count(ngx_pcre2_match_data);
ov = pcre2_get_ovector_pointer(ngx_pcre2_match_data);
if (n > size / 3) {
n = size / 3;
}
for (i = 0; i < n; i++) {
captures[i * 2] = ov[i * 2];
captures[i * 2 + 1] = ov[i * 2 + 1];
}
failed:
return rc;
}
#endif
/*
** in : string to inspect, associated rule
** does : apply the rule on the string, return 1 if matched,
** 0 else and -1 on error
*/
int
ngx_http_process_basic_rule_buffer(ngx_str_t* str, ngx_http_rule_t* rl, ngx_int_t* nb_match)
{
ngx_int_t match, tmp_idx, len;
unsigned char* ret;
int captures[30];
if (!rl->br || !nb_match)
return (-1);
*nb_match = 0;
if (rl->br->match_type == RX && rl->br->rx) {
tmp_idx = 0;
len = str->len;
while
#if (NGX_PCRE2)
(tmp_idx < len &&
(match = ngx_pcre2_exec(rl->br->rx->regex, str->data, str->len, tmp_idx, captures, 30)) >= 0)
#elif defined nginx_version && (nginx_version >= 1002002 && nginx_version != 1003000)
(tmp_idx < len && (match = pcre_exec(rl->br->rx->regex->code,
0,
(const char*)str->data,
str->len,
tmp_idx,
0,
captures,
30)) >= 0)
#elif defined nginx_version && (nginx_version > 1001011)
(tmp_idx < len && (match = pcre_exec(rl->br->rx->regex->pcre,
0,
(const char*)str->data,
str->len,
tmp_idx,
0,
captures,
30)) >= 0)
#elif defined nginx_version && (nginx_version <= 1001011)
(tmp_idx < len &&
(match = pcre_exec(
rl->br->rx->regex, 0, (const char*)str->data, str->len, tmp_idx, 0, captures, 30)) >= 0)
#elif defined nginx_version
#error "Inconsistent nginx version."
(0)
#else
#error "nginx_version not defined."
(0)
#endif
{
*nb_match += match;
tmp_idx = captures[1];
}
if (*nb_match > 0) {
if (rl->br->negative)
return (0);
else
return (1);
} else if (*nb_match == 0) {
if (rl->br->negative)
return (1);
else
return (0);
}
return (-1);
} else if (rl->br->match_type == STR && rl->br->str) {
match = 0;
tmp_idx = 0;
while (1) {
ret = (unsigned char*)strfaststr((unsigned char*)str->data + tmp_idx,
(unsigned int)str->len - tmp_idx,
(unsigned char*)rl->br->str->data,
(unsigned int)rl->br->str->len);
if (ret) {
match = 1;
*nb_match = *nb_match + 1;
} else
break;
if (nb_match && ret < (str->data + str->len)) {
tmp_idx = (ret - str->data) + 1;
if (tmp_idx > (int)(str->len - 1))
break;
} else
break;
}
if (match) {
if (rl->br->negative)
return (0);
else
return (1);
} else {
if (rl->br->negative)
return (1);
else
return (0);
}
} else if (rl->br->match_type == LIBINJ_XSS) {
if (libinjection_xss((const char*)str->data, str->len) == 1)
return (1);
} else if (rl->br->match_type == LIBINJ_SQL) {
sfilter state;
libinjection_sqli_init(&state, (const char*)str->data, str->len, FLAG_NONE);
if (libinjection_is_sqli(&state) == 1)
return (1);
}
return (0);
}
/*
** Check if a (matched) rule is whitelisted.
** This func will look for the current URI in the wlr_url_hash [hashtable]
** It will also look for varname in the wlr_body|args|headers_hash [hashtable]
** and It will also look for disabled rules.
** 1 - If the rule is disabled, it's whitelisted
** 2 - If a matching URL is found, check if the further information confirms
*that the rule should be whitelisted
** ($URL:/bar|$ARGS_VAR:foo : it's not because URL matches that we should
*whitelist rule)
** 3 - If a matching varname is found, check zone and rules IDs.
** [TODO] : Add mz matches with style BODY|HEADERS|...
** returns (1) if rule is whitelisted, else (0)
*/
int
ngx_http_naxsi_is_whitelist_adapted(ngx_http_whitelist_rule_t* b,
ngx_str_t* name,
naxsi_match_zone_t zone,
ngx_http_rule_t* r,
ngx_http_request_t* req,
naxsi_match_type_t type,
ngx_int_t target_name)
{
/* if something was found, check the rule ID */
if (!b) {
return (0);
}
/* FILE_EXT zone is just a hack, as it indeed targets BODY */
if (zone == FILE_EXT)
zone = BODY;
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"Possible whitelist ... check...");
/* if whitelist targets arg name, but the rules hit content*/
if (b->target_name && !target_name) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"whitelist targets name, but rule matched content.");
return (0);
}
/* if if the whitelist target contents, but the rule hit arg name*/
if (!b->target_name && target_name) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"whitelist targets content, but rule matched name.");
return (0);
}
if (type == NAME_ONLY) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"Name match in zone %s",
zone == ARGS ? "ARGS"
: zone == BODY ? "BODY"
: zone == HEADERS ? "HEADERS"
: "UNKNOWN!!!!!");
// False Positive, there was a whitelist that matches the argument name,
// But is was actually matching an existing URI name.
if (b->zone == ANY && (zone == ARGS || zone == BODY || zone == HEADERS)) {
return (nx_check_ids(r->rule_id, b->ids));
} else if (zone != b->zone || b->uri_only) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"bad whitelist, name match, but WL was only on URL.");
return (0);
}
return (nx_check_ids(r->rule_id, b->ids));
}
if (type == URI_ONLY || type == MIXED) {
/* zone must match */
if (b->uri_only && type != URI_ONLY) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"bad whitelist, type is URI_ONLY, but not whitelist");
return (0);
}
if (zone != b->zone && b->zone != ANY) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"bad whitelist, URL match, but not zone");
return (0);
}
return (nx_check_ids(r->rule_id, b->ids));
}
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"finished wl check, failed.");
return (0);
}
ngx_http_whitelist_rule_t*
nx_find_wl_in_hash(ngx_http_request_t* req,
ngx_str_t* mstr,
ngx_http_naxsi_loc_conf_t* cf,
naxsi_match_zone_t zone)
{
ngx_int_t k = 0;
ngx_http_whitelist_rule_t* b = NULL;
ngx_str_t scratch = { .data = NULL, .len = mstr->len };
scratch.data = ngx_pcalloc(req->pool, mstr->len + 1);
if (!scratch.data) {
return NULL;
}
k = ngx_hash_strlow(scratch.data, mstr->data, mstr->len);
if ((zone == BODY || zone == FILE_EXT || zone == ANY) && cf->wlr_body_hash &&
cf->wlr_body_hash->size > 0) {
b = (ngx_http_whitelist_rule_t*)ngx_hash_find(
cf->wlr_body_hash, k, (u_char*)scratch.data, scratch.len);
}
if ((zone == HEADERS || (zone == ANY && !b)) && cf->wlr_headers_hash &&
cf->wlr_headers_hash->size > 0) {
b = (ngx_http_whitelist_rule_t*)ngx_hash_find(
cf->wlr_headers_hash, k, (u_char*)scratch.data, scratch.len);
}
if ((zone == URL || (zone == ANY && !b)) && cf->wlr_url_hash && cf->wlr_url_hash->size > 0) {
b = (ngx_http_whitelist_rule_t*)ngx_hash_find(
cf->wlr_url_hash, k, (u_char*)scratch.data, scratch.len);
}
if ((zone == ARGS || (zone == ANY && !b)) && cf->wlr_args_hash && cf->wlr_args_hash->size > 0) {
b = (ngx_http_whitelist_rule_t*)ngx_hash_find(
cf->wlr_args_hash, k, (u_char*)scratch.data, scratch.len);
}
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"find wl in hash %d %p %s.",
k,
b,
zone == ARGS ? "ARGS"
: zone == HEADERS ? "HEADERS"
: zone == BODY ? "BODY"
: zone == URL ? "URL"
: zone == FILE_EXT ? "FILE_EXT"
: zone == RAW_BODY ? "RAW_BODY"
: zone == ANY ? "ANY"
: "UNKNOWN");
ngx_pfree(req->pool, scratch.data);
return (b);
}
int
naxsi_can_ignore_ip(const ngx_str_t* ipstr, ngx_http_naxsi_loc_conf_t* cf)
{
if (!cf->ignore_ips || cf->ignore_ips_ha.keys.nelts < 1) {
return 0;
}
char ip_str[INET6_ADDRSTRLEN + 1] = { 0 };
if (!naxsi_parse_ip(ipstr, NULL, ip_str)) {
return 0;
}
ngx_str_t scratch = { .data = (unsigned char*)ip_str, .len = strlen(ip_str) };
ngx_uint_t k = ngx_hash_key(scratch.data, scratch.len);
return ngx_hash_find(cf->ignore_ips, k, (u_char*)scratch.data, scratch.len) != NULL ? 1 : 0;
}
int
naxsi_can_ignore_cidr(const ngx_str_t* ipstr, ngx_http_naxsi_loc_conf_t* cf)
{
if (!cf->ignore_cidrs) {
return 0;
}
ngx_uint_t i;
ip_t ip = ip_zero;
if (!naxsi_parse_ip(ipstr, &ip, NULL)) {
return 0;
}
for (i = 0; i < cf->ignore_cidrs->nelts; i++) {
cidr_t* cidr = &((cidr_t*)cf->ignore_cidrs->elts)[i];
if (naxsi_is_in_subnet(cidr, &ip)) {
return 1;
}
}
return 0;
}
#define custloc_array(x) ((ngx_http_custom_rule_location_t*)x)
/*
** wrapper used for regex matchzones. Should be used by classic basestr* as
*well.
*/
int
ngx_http_naxsi_pcre_wrapper(ngx_regex_compile_t* rx, unsigned char* str, unsigned int len)
{
int match;
int captures[30];
#if (NGX_PCRE2)
match = ngx_pcre2_exec(rx->regex, str, len, 0, captures, 1);
#elif defined nginx_version && (nginx_version >= 1002002 && nginx_version != 1003000)
match = pcre_exec(rx->regex->code, 0, (const char*)str, len, 0, 0, captures, 1);
#elif defined nginx_version && (nginx_version > 1001011)
match = pcre_exec(rx->regex->pcre, 0, (const char*)str, len, 0, 0, captures, 1);
#elif defined nginx_version && (nginx_version <= 1001011)
match = pcre_exec(rx->regex, 0, (const char*)str, len, 0, 0, captures, 1);
#elif defined nginx_version
#error "Inconsistent nginx version."
return (0);
#else
#error "nginx_version not defined."
return (0);
#endif
if (match > 0)
return (1);
return (match);
}
int
ngx_http_naxsi_is_rule_whitelisted_rx(ngx_http_request_t* req,
ngx_http_naxsi_loc_conf_t* cf,
ngx_http_rule_t* r,
ngx_str_t* name,
naxsi_match_zone_t zone,
ngx_int_t target_name)
{
ngx_http_rule_t* p;
ngx_uint_t i, x;
int rx_match, violation;
/* Look it up in regexed whitelists for matchzones */
if (!cf->rxmz_wlr || cf->rxmz_wlr->nelts < 1) {
return (0);
}
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"RXX - Trying to find rx for %v",
name);
for (i = 0; i < cf->rxmz_wlr->nelts; i++) {
p = (((ngx_http_rule_t**)(cf->rxmz_wlr->elts))[i]);
if (!p->br || !p->br->custom_locations || p->br->custom_locations->nelts < 1) {
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"Rule pushed to RXMZ, but has no custom_location.");
continue;
}
/*
** once we have pointer to the rule :
** - go through each custom location (ie. ARGS_VAR_X:foobar*)
** - verify that regular expressions match. If not, it means whitelist does
*not apply.
*/
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"%d/%d RXMZ rule has %d custom locations",
i,
cf->rxmz_wlr->nelts,
p->br->custom_locations->nelts);
if (p->br->zone != (ngx_int_t)zone && p->br->zone != ANY) {
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"%d/%d Not targeting same zone.",
i,
cf->rxmz_wlr->nelts);
continue;
}
if (target_name != p->br->target_name) {
NX_DEBUG(
_debug_wl_debug_rx, NGX_LOG_DEBUG_HTTP, req->connection->log, 0, "only one target_name");
continue;
}
for (x = 0, violation = 0; x < p->br->custom_locations->nelts && violation == 0; x++) {
/* does custom location targets a body var ? */
if (custloc_array(p->br->custom_locations->elts)[x].body_var) {
rx_match = ngx_http_naxsi_pcre_wrapper(
custloc_array(p->br->custom_locations->elts)[x].target_rx, name->data, name->len);
if (rx_match < 0) {
violation = 1;
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"[BODY] FAIL:%d (rx:%V, str:%V)",
rx_match,
&(custloc_array(p->br->custom_locations->elts)[x].target_rx->pattern),
name);
break;
}
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"[BODY] Match:%d (rx:%V, str:%V)",
rx_match,
&(custloc_array(p->br->custom_locations->elts)[x].target_rx->pattern),
name);
}
if (custloc_array(p->br->custom_locations->elts)[x].args_var) {
rx_match = ngx_http_naxsi_pcre_wrapper(
custloc_array(p->br->custom_locations->elts)[x].target_rx, name->data, name->len);
if (rx_match < 0) {
violation = 1;
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"[ARGS] FAIL:%d (rx:%V, str:%V)",
rx_match,
&(custloc_array(p->br->custom_locations->elts)[x].target_rx->pattern),
name);
break;
}
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"[ARGS] Match:%d (rx:%V, str:%V)",
rx_match,
&(custloc_array(p->br->custom_locations->elts)[x].target_rx->pattern),
name);
}
if (custloc_array(p->br->custom_locations->elts)[x].specific_url) {
/* if there is a specific url, check it regardless of zone. */
rx_match = ngx_http_naxsi_pcre_wrapper(
custloc_array(p->br->custom_locations->elts)[x].target_rx, req->uri.data, req->uri.len);
if (rx_match < 0) {
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"[URI] FAIL:%d (rx:%V, str:%V)",
rx_match,
&(custloc_array(p->br->custom_locations->elts)[x].target_rx->pattern),
&(req->uri));
violation = 1;
break;
}
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"[URI] Match:%d (rx:%V, str:%V)",
rx_match,
&(custloc_array(p->br->custom_locations->elts)[x].target_rx->pattern),
&(req->uri));
}
}
if (violation == 0) {
NX_DEBUG(_debug_wl_debug_rx,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"wut, rule whitelisted by rx.");
if (nx_check_ids(r->rule_id, p->wlid_array) == 1)
return (1);
} else {
NX_DEBUG(_debug_wl_debug_rx, NGX_LOG_DEBUG_HTTP, req->connection->log, 0, "not good ----");
}
}
return (0);
}
int
ngx_http_naxsi_is_rule_whitelisted_n(ngx_http_request_t* req,
ngx_http_naxsi_loc_conf_t* cf,
ngx_http_rule_t* r,
ngx_str_t* name,
naxsi_match_zone_t zone,
ngx_int_t target_name)
{
ngx_int_t k = 0;
ngx_http_whitelist_rule_t* b = NULL;
unsigned int i = 0;
ngx_http_rule_t** dr = NULL;
ngx_str_t tmp_hashname = { 0 };
ngx_str_t nullname = ngx_null_string;
/* if name is NULL, replace it by an empty string */
if (!name)
name = &nullname;
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"is rule [%d] whitelisted in zone %s for item %V",
r->rule_id,
zone == ARGS ? "ARGS"
: zone == HEADERS ? "HEADERS"
: zone == BODY ? "BODY"
: zone == URL ? "URL"
: zone == FILE_EXT ? "FILE_EXT"
: zone == RAW_BODY ? "RAW_BODY"
: zone == ANY ? "ANY"
: "UNKNOWN",
name);
NX_DEBUG(_debug_whitelist_compat && target_name,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"extra: exception happened in |NAME");
/* Check if the rule is part of disabled rules for this location */
if (cf->disabled_rules) {
dr = cf->disabled_rules->elts;
for (i = 0; i < cf->disabled_rules->nelts; i++) {
/* Is rule disabled ? */
if (nx_check_ids(r->rule_id, dr[i]->wlid_array)) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"rule %d is disabled somewhere",
r->rule_id);
/* if it doesn't specify zone, skip zone-check */
if (!dr[i]->br) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"no zone, skip zone-check");
continue;
}
/* If rule target nothing, it's whitelisted everywhere */
if (!(dr[i]->br->args || dr[i]->br->headers || dr[i]->br->body || dr[i]->br->url)) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"rule %d is fully disabled",
r->rule_id);
return (1);
}
/* if exc is in name, but rule is not specificaly disabled for name (and
* targets a zone) */
if (target_name != dr[i]->br->target_name)
continue;
switch (zone) {
case ANY:
if (dr[i]->br->any) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"rule %d is disabled in ANY",
r->rule_id);
return (1);
}
break;
case ARGS:
if (dr[i]->br->args) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"rule %d is disabled in ARGS",
r->rule_id);
return (1);
}
break;
case HEADERS:
if (dr[i]->br->headers) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"rule %d is disabled in HEADERS",
r->rule_id);
return (1);
}
break;
case BODY:
if (dr[i]->br->body) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"rule %d is disabled in BODY",
r->rule_id);
return (1);
}
break;
case RAW_BODY:
if (dr[i]->br->body) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"rule %d is disabled in BODY",
r->rule_id);
return (1);
}
break;
case FILE_EXT:
if (dr[i]->br->file_ext) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"rule %d is disabled in FILE_EXT",
r->rule_id);
return (1);
}
break;
case URL:
if (dr[i]->br->url) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"rule %d is disabled in URL zone:%d",
r->rule_id,
zone);
return (1);
}
break;
default:
break;
}
}
}
}
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"hashing varname [%V]",
name);
/*
** check for ARGS_VAR:x(|NAME) whitelists.
** (name) or (#name)
*/
if (name->len > 0) {
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"hashing varname [%V] (rule:%d) - 'wl:X_VAR:%V'",
name,
r->rule_id,
name);
/* try to find in hashtables */
b = nx_find_wl_in_hash(req, name, cf, zone);
if (ngx_http_naxsi_is_whitelist_adapted(b, name, zone, r, req, NAME_ONLY, target_name)) {
return (1);
}
/*prefix hash with '#', to find whitelists that would be done only on
* ARGS_VAR:X|NAME */
tmp_hashname.len = name->len + 1;
/* too bad we have to realloc just to add the '#' */
tmp_hashname.data = ngx_pcalloc(req->pool, tmp_hashname.len + 1);
tmp_hashname.data[0] = '#';
memcpy(tmp_hashname.data + 1, name->data, name->len);
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"hashing varname [%V] (rule:%d) - 'wl:X_VAR:%V|NAME'",
name,
r->rule_id,
name);
b = nx_find_wl_in_hash(req, &tmp_hashname, cf, zone);
ngx_pfree(req->pool, tmp_hashname.data);
tmp_hashname.data = NULL;
if (ngx_http_naxsi_is_whitelist_adapted(b, name, zone, r, req, NAME_ONLY, target_name)) {
return (1);
}
}
/* Plain URI whitelists */
if (cf->wlr_url_hash && cf->wlr_url_hash->size > 0) {
/* check the URL no matter what zone we're in */
tmp_hashname.data = ngx_pcalloc(req->pool, req->uri.len + 1);
/* mimic find_wl_in_hash, we are looking in a different hashtable */
if (!tmp_hashname.data) {
return (0);
}
tmp_hashname.len = req->uri.len;
k = ngx_hash_strlow(tmp_hashname.data, req->uri.data, req->uri.len);
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"hashing uri [%V] (rule:%d) 'wl:$URI:%V|*' %d",
&req->uri,
r->rule_id,
&tmp_hashname,
k);
b = (ngx_http_whitelist_rule_t*)ngx_hash_find(
cf->wlr_url_hash, k, (u_char*)tmp_hashname.data, tmp_hashname.len);
ngx_pfree(req->pool, tmp_hashname.data);
tmp_hashname.data = NULL;
NX_DEBUG(_debug_whitelist_compat, NGX_LOG_DEBUG_HTTP, req->connection->log, 0, "%p", b);
if (ngx_http_naxsi_is_whitelist_adapted(b, name, zone, r, req, URI_ONLY, target_name)) {
return (1);
}
}
/* Lookup for $URL|URL (uri)*/
tmp_hashname.data = ngx_pcalloc(req->pool, req->uri.len + 1);
if (!tmp_hashname.data) {
return (0);
}
tmp_hashname.len = req->uri.len;
ngx_memcpy(tmp_hashname.data, req->uri.data, req->uri.len);
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"hashing uri#1 [%V] (rule:%d) ($URL:%V|URI)",
&req->uri,
r->rule_id,
&tmp_hashname);
b = nx_find_wl_in_hash(req, &tmp_hashname, cf, zone);
ngx_pfree(req->pool, tmp_hashname.data);
tmp_hashname.data = NULL;
if (ngx_http_naxsi_is_whitelist_adapted(b, name, zone, r, req, URI_ONLY, target_name)) {
return (1);
}
/* Looking $URL:x|ZONE|NAME */
tmp_hashname.data = ngx_pcalloc(req->pool, req->uri.len + 2);
/* should make it sound crit isn't it ?*/
if (!tmp_hashname.data)
return (0);
tmp_hashname.len = req->uri.len + 1;
tmp_hashname.data[0] = '#';
ngx_memcpy(tmp_hashname.data + 1, req->uri.data, req->uri.len);
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"hashing uri#3 [%V] (rule:%d) ($URL:%V|ZONE|NAME)",
&req->uri,
r->rule_id,
&tmp_hashname);
b = nx_find_wl_in_hash(req, &tmp_hashname, cf, zone);
ngx_pfree(req->pool, tmp_hashname.data);
tmp_hashname.data = NULL;
if (ngx_http_naxsi_is_whitelist_adapted(b, name, zone, r, req, URI_ONLY, target_name)) {
return (1);
}
/* Maybe it was $URL+$VAR (uri#name) or (#uri#name) */
tmp_hashname.len = req->uri.len + 1 + name->len;
/* one extra byte for target_name '#' */
tmp_hashname.data = ngx_pcalloc(req->pool, tmp_hashname.len + 2);
if (target_name) {
tmp_hashname.len++;
strcat((char*)tmp_hashname.data, "#");
}
strncat((char*)tmp_hashname.data, (char*)req->uri.data, req->uri.len);
strcat((char*)tmp_hashname.data, "#");
strncat((char*)tmp_hashname.data, (char*)name->data, name->len);
NX_DEBUG(_debug_whitelist_compat,
NGX_LOG_DEBUG_HTTP,
req->connection->log,
0,
"hashing MIX [%V] (rule:%d) ($URL:%V|$X_VAR:y) or ($URL:%V|$X_VAR:y|NAME)",
&req->uri,
r->rule_id,
&tmp_hashname,
&tmp_hashname);
b = nx_find_wl_in_hash(req, &(tmp_hashname), cf, zone);