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Added Response Phase for Nginx

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This commit is contained in:
chaizhenhua
2013-01-26 22:29:11 +08:00
parent 48bd09939f
commit 972d9e2abf
7 changed files with 774 additions and 351 deletions
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232
nginx/modsecurity/apr_bucket_nginx.c Normal file
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@@ -0,0 +1,232 @@
#include <apr_bucket_nginx.h>
static apr_status_t nginx_bucket_read(apr_bucket *b, const char **str,
apr_size_t *len, apr_read_type_e block);
static void nginx_bucket_destroy(void *data);
static const apr_bucket_type_t apr_bucket_type_nginx = {
"NGINX", 5, APR_BUCKET_DATA,
nginx_bucket_destroy,
nginx_bucket_read,
apr_bucket_setaside_noop,
apr_bucket_shared_split,
apr_bucket_shared_copy
};
typedef struct apr_bucket_nginx {
apr_bucket_refcount refcount;
ngx_buf_t *buf;
} apr_bucket_nginx;
/* ngx_buf_t to apr_bucket */
apr_bucket * apr_bucket_nginx_create(ngx_buf_t *buf,
apr_pool_t *p,
apr_bucket_alloc_t *list)
{
apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
APR_BUCKET_INIT(b); /* link */
b->free = apr_bucket_free;
b->list = list;
return apr_bucket_nginx_make(b, buf, p);
}
apr_bucket * apr_bucket_nginx_make(apr_bucket *b, ngx_buf_t *buf,
apr_pool_t *pool)
{
apr_bucket_nginx *n;
n = apr_bucket_alloc(sizeof(*n), b->list);
n->buf = buf;
b = apr_bucket_shared_make(b, n, 0, ngx_buf_size(buf));
b->type = &apr_bucket_type_nginx;
return b;
}
static apr_status_t nginx_bucket_read(apr_bucket *b, const char **str,
apr_size_t *len, apr_read_type_e block)
{
apr_bucket_nginx *n = b->data;
ngx_buf_t *buf = n->buf;
u_char *data;
ssize_t size;
if (buf->pos == NULL && ngx_buf_size(buf) != 0) {
data = apr_bucket_alloc(ngx_buf_size(buf), b->list);
if (data == NULL) {
return APR_EGENERAL;
}
size = ngx_read_file(buf->file, data, ngx_buf_size(buf), buf->file_pos);
if (size != ngx_buf_size(buf)) {
apr_bucket_free(data);
return APR_EGENERAL;
}
buf->pos = data;
}
*str = (char *)buf->pos + b->start;
*len = b->length;
return APR_SUCCESS;
}
static void nginx_bucket_destroy(void *data)
{
apr_bucket_nginx *n = data;
ngx_buf_t *buf = n->buf;
if (apr_bucket_shared_destroy(n)) {
if (!ngx_buf_in_memory(buf) && buf->pos != NULL) {
apr_bucket_free(buf->pos);
buf->pos = NULL;
}
apr_bucket_free(n);
}
}
ngx_buf_t * apr_bucket_to_ngx_buf(apr_bucket *e, ngx_pool_t *pool) {
ngx_buf_t *buf, *b;
apr_bucket_nginx *n;
ngx_uint_t len;
u_char *data;
if (e->type->is_metadata) {
return NULL;
}
if (e->type == &apr_bucket_type_nginx) {
n = e->data;
b = n->buf;
/* whole buf */
if (e->length == (apr_size_t)ngx_buf_size(b)) {
b->last_buf = 0;
return b;
}
buf = ngx_palloc(pool, sizeof(ngx_buf_t));
if (buf == NULL) {
return NULL;
}
ngx_memcpy(buf, b, sizeof(ngx_buf_t));
if (ngx_buf_in_memory(buf)) {
buf->start = buf->pos = buf->pos + e->start;
buf->end = buf->last = buf->pos + e->length;
} else {
buf->pos = NULL;
buf->file_pos += e->start;
buf->file_last = buf->file_pos + e->length;
}
buf->last_buf = 0;
return buf;
}
if (apr_bucket_read(e, (const char **)&data,
&len, APR_BLOCK_READ) != APR_SUCCESS) {
return NULL;
}
buf = ngx_calloc_buf(pool);
if (buf == NULL) {
return NULL;
}
if (e->type == &apr_bucket_type_pool) {
buf->start = data;
} else if (len != 0) {
buf->start = ngx_palloc(pool, len);
ngx_memcpy(buf->start, data, len);
}
buf->pos = buf->start;
buf->end = buf->last = buf->start + len;
buf->temporary = 1;
return buf;
}
ngx_int_t
move_chain_to_brigade(ngx_chain_t *chain, apr_bucket_brigade *bb, ngx_pool_t *pool) {
apr_bucket *e;
ngx_chain_t *cl;
while (chain) {
e = ngx_buf_to_apr_bucket(chain->buf, bb->p, bb->bucket_alloc);
if (e == NULL) {
return NGX_ERROR;
}
APR_BRIGADE_INSERT_TAIL(bb, e);
if (chain->buf->last_buf) {
e = apr_bucket_eos_create(bb->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
chain->buf->last_buf = 0;
return NGX_OK;
}
cl = chain;
chain = chain->next;
ngx_free_chain(pool, cl);
}
return NGX_AGAIN;
}
ngx_int_t
move_brigade_to_chain(apr_bucket_brigade *bb, ngx_chain_t **ll, ngx_pool_t *pool) {
apr_bucket *e;
ngx_buf_t *buf;
ngx_chain_t *cl;
cl = NULL;
if (APR_BRIGADE_EMPTY(bb)) {
*ll = NULL;
return NGX_OK;
}
for (e = APR_BRIGADE_FIRST(bb);
e != APR_BRIGADE_SENTINEL(bb);
e = APR_BUCKET_NEXT(e)) {
if (APR_BUCKET_IS_EOS(e)) {
if (cl == NULL) {
*ll = cl;
} else {
cl->buf->last_buf = 1;
}
apr_brigade_cleanup(bb);
return NGX_OK;
}
if (APR_BUCKET_IS_METADATA(e)) {
continue;
}
buf = apr_bucket_to_ngx_buf(e, pool);
if (buf == NULL) {
break;
}
cl = ngx_alloc_chain_link(pool);
if (cl == NULL) {
break;
}
cl->buf = buf;
cl->next = NULL;
*ll = cl;
ll = &cl->next;
}
apr_brigade_cleanup(bb);
/* no eos or error */
return NGX_ERROR;
}

18
nginx/modsecurity/apr_bucket_nginx.h Normal file
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@@ -0,0 +1,18 @@
#pragma once
#include <ngx_core.h>
#include "apr_buckets.h"
apr_bucket * apr_bucket_nginx_create(ngx_buf_t *buf,
apr_pool_t *p,
apr_bucket_alloc_t *list);
apr_bucket * apr_bucket_nginx_make(apr_bucket *e, ngx_buf_t *buf,
apr_pool_t *pool);
#define ngx_buf_to_apr_bucket apr_bucket_nginx_create
ngx_buf_t * apr_bucket_to_ngx_buf(apr_bucket *e, ngx_pool_t *pool);
ngx_int_t move_chain_to_brigade(ngx_chain_t *chain, apr_bucket_brigade *bb, ngx_pool_t *pool);
ngx_int_t move_brigade_to_chain(apr_bucket_brigade *bb, ngx_chain_t **chain, ngx_pool_t *pool);

9
nginx/modsecurity/config
View File

@@ -1,6 +1,9 @@
ngx_addon_name=ngx_http_modsecurity
HTTP_MODULES="$HTTP_MODULES ngx_http_modsecurity"
NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_modsecurity.c"
# HTTP_MODULES="$HTTP_MODULES ngx_http_modsecurity"
HTTP_HEADERS_FILTER_MODULE="ngx_http_modsecurity $HTTP_HEADERS_FILTER_MODULE"
NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_modsecurity.c $ngx_addon_dir/apr_bucket_nginx.c"
NGX_ADDON_DEPS="$NGX_ADDON_DEPS"
CORE_LIBS="$CORE_LIBS $ngx_addon_dir/../../standalone/.libs/standalone.a -lapr-1 -laprutil-1 -lxml2 -lm"
CORE_INCS="$CORE_INCS /usr/include/apache2 /usr/include/apr-1.0 /usr/include/httpd /usr/include/apr-1 $ngx_addon_dir/../../standalone $ngx_addon_dir/../../apache2 /usr/include/libxml2"
CORE_INCS="$CORE_INCS /usr/include/apache2 /usr/include/apr-1.0 /usr/include/httpd /usr/include/apr-1 $ngx_addon_dir $ngx_addon_dir/../../standalone $ngx_addon_dir/../../apache2 /usr/include/libxml2"
have=REQUEST_EARLY . auto/have

626
nginx/modsecurity/ngx_http_modsecurity.c
View File

@@ -20,7 +20,7 @@
#include <ngx_http_core_module.h>
#include <ctype.h>
#include <sys/times.h>
#include <apr_bucket_nginx.h>
#undef CR
#undef LF
#undef CRLF
@@ -32,17 +32,18 @@
typedef struct {
ngx_flag_t enable;
directory_config *config;
ngx_str_t *file;
ngx_uint_t line;
} ngx_http_modsecurity_loc_conf_t;
typedef struct {
ngx_http_request_t *r;
conn_rec *connection;
request_rec *req;
ngx_chain_t *chain;
ngx_buf_t buf;
void **loc_conf;
unsigned request_body_in_single_buf:1;
unsigned request_body_in_file_only:1;
apr_bucket_brigade *brigade;
unsigned complete;
} ngx_http_modsecurity_ctx_t;
@@ -50,7 +51,9 @@ typedef struct {
** Module's registred function/handlers.
*/
static ngx_int_t ngx_http_modsecurity_handler(ngx_http_request_t *r);
static void ngx_http_modsecurity_request_body_handler(ngx_http_request_t *r);
static void ngx_http_modsecurity_body_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_modsecurity_header_filter(ngx_http_request_t *r);
static ngx_int_t ngx_http_modsecurity_body_filter(ngx_http_request_t *r, ngx_chain_t *in);
static ngx_int_t ngx_http_modsecurity_preconfiguration(ngx_conf_t *cf);
static ngx_int_t ngx_http_modsecurity_init(ngx_conf_t *cf);
static ngx_int_t ngx_http_modsecurity_init_process(ngx_cycle_t *cycle);
@@ -58,13 +61,12 @@ static void ngx_http_modsecurity_exit_process(ngx_cycle_t *cycle);
static void *ngx_http_modsecurity_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_modsecurity_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child);
static char *ngx_http_modsecurity_config(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
apr_status_t modsecurity_read_body_cb(request_rec *r, char *buf, unsigned int length,
unsigned int *readcnt, int *is_eos);
apr_status_t modsecurity_write_body_cb(request_rec *rec, char *buf, unsigned int length);
static char *ngx_http_modsecurity_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_http_modsecurity_ctx_t * ngx_http_modsecurity_create_ctx(ngx_http_request_t *r);
static int ngx_http_modsecurity_drop_action(request_rec *r);
static void ngx_http_modsecurity_cleanup(void *data);
static char *ConvertNgxStringToUTF8(ngx_str_t str, apr_pool_t *pool);
/* command handled by the module */
static ngx_command_t ngx_http_modsecurity_commands[] = {
@@ -77,7 +79,7 @@ static ngx_command_t ngx_http_modsecurity_commands[] = {
{ ngx_string("ModSecurityEnabled"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF
|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,
ngx_conf_set_flag_slot,
ngx_http_modsecurity_enable,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_modsecurity_loc_conf_t, enable),
NULL },
@@ -118,6 +120,40 @@ ngx_module_t ngx_http_modsecurity = {
NGX_MODULE_V1_PADDING
};
static inline ngx_int_t
ngx_list_copy_to_apr_table(ngx_list_t *list, apr_table_t *table, apr_pool_t *pool) {
ngx_list_part_t *part;
ngx_table_elt_t *h;
ngx_uint_t i;
char *key, *value;
part = &list->part;
h = part->elts;
for (i = 0; ; i++) {
if (i >= part->nelts) {
if (part->next == NULL)
break;
part = part->next;
h = part->elts;
i = 0;
}
key = ConvertNgxStringToUTF8(h[i].key, pool);
if (key == NULL) {
return NGX_ERROR;
}
value = ConvertNgxStringToUTF8(h[i].value, pool);
if (value == NULL) {
return NGX_ERROR;
}
apr_table_setn(table, key, value);
}
return NGX_OK;
}
/* create loc conf struct */
static void *
@@ -125,10 +161,11 @@ ngx_http_modsecurity_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_modsecurity_loc_conf_t *conf;
conf = (ngx_http_modsecurity_loc_conf_t *) ngx_pcalloc(cf->pool, sizeof(ngx_http_modsecurity_loc_conf_t));
conf = (ngx_http_modsecurity_loc_conf_t *) ngx_palloc(cf->pool, sizeof(ngx_http_modsecurity_loc_conf_t));
if (conf == NULL)
return NULL;
conf->config = NGX_CONF_UNSET_PTR;
conf->enable = NGX_CONF_UNSET;
return conf;
@@ -142,16 +179,20 @@ ngx_http_modsecurity_merge_loc_conf(ngx_conf_t *cf, void *parent,
ngx_http_modsecurity_loc_conf_t *prev = parent;
ngx_http_modsecurity_loc_conf_t *conf = child;
if (conf->config == NULL) {
conf->config = prev->config;
}
ngx_conf_merge_value(conf->enable, prev->enable, 0);
ngx_conf_merge_ptr_value(conf->config, prev->config, NULL);
if (conf->enable && conf->config == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"ModSecurity: enabled in %V:%ui while no config file is specified ",
conf->file, conf->line);
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
void
static void
modsecLog(void *obj, int level, char *str)
{
if (obj != NULL) {
@@ -169,13 +210,13 @@ modsecLog(void *obj, int level, char *str)
*/
extern apr_pool_t *pool;
void *
static void *
modsec_pcre_malloc(size_t size)
{
return apr_palloc(pool, size);
}
void
static void
modsec_pcre_free(void *ptr)
{
}
@@ -190,8 +231,6 @@ ngx_http_modsecurity_preconfiguration(ngx_conf_t *cf)
modsecSetLogHook(cf->log, modsecLog);
modsecSetDropAction(ngx_http_modsecurity_drop_action);
modsecSetReadBody(modsecurity_read_body_cb);
modsecSetWriteBody(modsecurity_write_body_cb);
modsecInit();
modsecStartConfig();
@@ -199,6 +238,9 @@ ngx_http_modsecurity_preconfiguration(ngx_conf_t *cf)
return NGX_OK;
}
static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
static ngx_int_t
ngx_http_modsecurity_init(ngx_conf_t *cf)
{
@@ -218,20 +260,11 @@ ngx_http_modsecurity_init(ngx_conf_t *cf)
}
*h = ngx_http_modsecurity_handler;
#ifdef PROCESS_RESPONSE
/*
** This function sets up handlers for CONTENT_PHASE,
** XXX: not implemented yet
*/
/* Register for CONTENT phase ?? */
h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);
if (h == NULL) {
return NGX_ERROR;
}
*h = ngx_http_modsecurity_content_handler;
#endif
ngx_http_next_header_filter = ngx_http_top_header_filter;
ngx_http_top_header_filter = ngx_http_modsecurity_header_filter;
ngx_http_next_body_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_modsecurity_body_filter;
return NGX_OK;
}
@@ -251,10 +284,14 @@ ngx_http_modsecurity_exit_process(ngx_cycle_t *cycle)
}
char *
static char *
ConvertNgxStringToUTF8(ngx_str_t str, apr_pool_t *pool)
{
char *t = (char *) apr_palloc(pool, str.len + 1);
if (!t) {
return NULL;
}
ngx_memcpy(t, str.data, str.len);
t[str.len] = 0;
@@ -262,114 +299,7 @@ ConvertNgxStringToUTF8(ngx_str_t str, apr_pool_t *pool)
return t;
}
/*
** request body callback, passing body to mod security
*/
apr_status_t
modsecurity_read_body_cb(request_rec *r, char *outpos, unsigned int length,
unsigned int *outlen, int *is_eos)
{
size_t len, rest;
ssize_t size;
ngx_http_modsecurity_ctx_t *ctx;
ctx = (ngx_http_modsecurity_ctx_t *) apr_table_get(r->notes, NOTE_NGINX_REQUEST_CTX);
if (ctx == NULL) {
return APR_EINVAL;
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ctx->r->connection->log, 0, "modSecurity: read_body_cb");
ngx_buf_t *buf = &ctx->buf;
rest = length;
*is_eos = 0;
while (rest) {
if (ngx_buf_size(buf) == 0) {
if (ctx->chain == NULL) {
*outlen = length - rest;
*is_eos = 1;
// END
return APR_SUCCESS;
}
ngx_memcpy(buf, ctx->chain->buf, sizeof(ngx_buf_t));
ctx->chain = ctx->chain->next;
}
len = (size_t) ngx_min((size_t)ngx_buf_size(buf), rest);
if (ngx_buf_in_memory(buf)) {
outpos = (char *) ngx_cpymem(outpos, buf->pos, len);
rest -= len;
buf->pos += len;
} else if (buf->in_file) {
size = ngx_read_file(buf->file, (u_char*)outpos, len, buf->file_pos);
if (size < 0) {
return NGX_ERROR;
}
outpos += size;
rest -= size;
buf->file_pos += size;
} else {
return -1;
}
}
*outlen = length - rest;
return APR_SUCCESS;
}
apr_status_t
modsecurity_write_body_cb(request_rec *rec, char *buf, unsigned int length)
{
ngx_buf_t *b;
ngx_http_modsecurity_ctx_t *ctx;
ngx_http_request_t *r;
ngx_str_t *str;
ctx = (ngx_http_modsecurity_ctx_t *) apr_table_get(rec->notes, NOTE_NGINX_REQUEST_CTX);
if (ctx == NULL) {
return APR_EINVAL;
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ctx->r->connection->log, 0, "modSecurity: write_body_cb");
r = ctx->r;
/* set request body */
b = r->header_in;
if (b->end < b->pos + length) {
b->start = ngx_palloc(ctx->r->pool, length);
if (b->start == NULL) {
return APR_EINVAL;
}
b->end = b->start + length;
b->pos = b->start;
}
b->last = ngx_cpymem(b->pos, buf, length);
/* set content_length_n */
r->headers_in.content_length_n = length;
/* set headers_in.content_length */
str = &r->headers_in.content_length->value;
str->data = ngx_palloc(r->pool, NGX_OFF_T_LEN);
if (str->data == NULL) {
return NGX_ERROR;
}
str->len = ngx_snprintf(str->data, NGX_OFF_T_LEN, "%O", length) - str->data;
return APR_SUCCESS;
}
apr_sockaddr_t *CopySockAddr(apr_pool_t *pool, struct sockaddr *pAddr) {
static apr_sockaddr_t *CopySockAddr(apr_pool_t *pool, struct sockaddr *pAddr) {
apr_sockaddr_t *addr = (apr_sockaddr_t *)apr_palloc(pool, sizeof(apr_sockaddr_t));
int adrlen = 16, iplen = 4;
@@ -411,21 +341,15 @@ static ngx_int_t
ngx_http_modsecurity_handler(ngx_http_request_t *r)
{
ngx_http_modsecurity_loc_conf_t *cf;
ngx_http_core_loc_conf_t *clcf, *lcf;
ngx_http_modsecurity_ctx_t *ctx;
ngx_int_t rc;
void **loc_conf;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "modSecurity: handler");
/* Process only main request */
if (r != r->main || r->internal) {
return NGX_DECLINED;
}
cf = ngx_http_get_module_loc_conf(r, ngx_http_modsecurity);
if (!cf->enable) {
/* Process only main request */
if (r != r->main || r->internal || !cf->enable) {
return NGX_DECLINED;
}
@@ -435,98 +359,252 @@ ngx_http_modsecurity_handler(ngx_http_request_t *r)
}
ngx_http_set_ctx(r, ctx, ngx_http_modsecurity);
if (r->method == NGX_HTTP_POST) {
/* Processing POST request body, should we process PUT? */
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "modSecurity: method POST");
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (clcf == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ctx->loc_conf = r->loc_conf;
/* hijack loc_conf so that we can receive any body length
* TODO: nonblocking process & chuncked body
*/
if (clcf->client_body_buffer_size < (size_t)r->headers_in.content_length_n) {
loc_conf = ngx_pcalloc(r->pool, sizeof(void *) * ngx_http_max_module);
if (loc_conf == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
lcf = ngx_pcalloc(r->pool, sizeof(ngx_http_core_loc_conf_t));
if (lcf == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* processing request headers */
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "modSecurity: process request headers");
ngx_memcpy(loc_conf, r->loc_conf, sizeof(void *) * ngx_http_max_module);
ngx_memcpy(lcf, clcf, sizeof(ngx_http_core_loc_conf_t));
ctx->loc_conf = r->loc_conf;
r->loc_conf = loc_conf;
ngx_http_get_module_loc_conf(r, ngx_http_core_module) = lcf;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
clcf->client_body_buffer_size = r->headers_in.content_length_n;
}
rc = modsecProcessRequestHeaders(ctx->req);
ctx->request_body_in_single_buf = r->request_body_in_single_buf;
ctx->request_body_in_file_only = r->request_body_in_file_only;
r->request_body_in_single_buf = 1;
r->request_body_in_file_only = 0;
if (rc == DECLINED) {
if (r->method == NGX_HTTP_POST) {
/* Processing POST request body, should we process PUT? */
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "modSecurity: method POST");
rc = ngx_http_read_client_request_body(r, ngx_http_modsecurity_request_body_handler);
if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
return rc;
}
return NGX_DONE;
} else {
/* processing all the other methods */
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "modSecurity: method is not POST");
rc = modsecProcessRequest(ctx->req);
if (rc != DECLINED) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "ModSecurity: status: %d, need action", rc);
ngx_http_clear_accept_ranges(r);
ngx_http_clear_last_modified(r);
ngx_http_clear_content_length(r);
/* Nginx and Apache share same response code */
rc = ngx_http_read_client_request_body(r, ngx_http_modsecurity_body_handler);
if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
return rc;
}
return NGX_DONE;
}
/* other method */
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "modSecurity: process request body");
rc = modsecProcessRequestBody(ctx->req);
}
if (rc != DECLINED) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "ModSecurity: status: %d, need action", rc);
/* Nginx and Apache share same response code */
if (rc < NGX_HTTP_SPECIAL_RESPONSE || rc >= 600) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
}
}
return rc;
}
return NGX_DECLINED;
}
static void
ngx_http_modsecurity_body_handler(ngx_http_request_t *r)
{
ngx_http_modsecurity_ctx_t *ctx;
ngx_int_t rc;
apr_off_t content_length;
ngx_str_t *str;
ngx_buf_t *buf;
if (r->request_body == NULL || r->request_body->bufs == NULL) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "modSecurity: request body empty");
r->phase_handler++;
ngx_http_core_run_phases(r);
ngx_http_finalize_request(r, NGX_DONE);
return;
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "modSecurity: process request body");
ctx = ngx_http_get_module_ctx(r, ngx_http_modsecurity);
rc = move_chain_to_brigade(r->request_body->bufs, ctx->brigade, r->pool);
if (rc == NGX_ERROR) {
return ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
}
r->request_body = NULL;
modsecSetBodyBrigade(ctx->req, ctx->brigade);
rc = modsecProcessRequestBody(ctx->req);
if (rc != DECLINED) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "ModSecurity: status: %d, need action", rc);
/* Nginx and Apache share same response code */
if (rc < NGX_HTTP_SPECIAL_RESPONSE || rc >= 600) {
rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
}
return ngx_http_finalize_request(r, rc);
}
apr_brigade_length(ctx->brigade, 0, &content_length);
buf = ngx_create_temp_buf(ctx->r->pool, (size_t) content_length);
if (buf == NULL){
return ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
}
if (apr_brigade_flatten(ctx->brigade, (char *)buf->pos, (apr_size_t *)&content_length) != APR_SUCCESS) {
return ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
}
apr_brigade_cleanup(ctx->brigade);
buf->last += content_length;
r->header_in = buf;
if (r->headers_in.content_length) {
str = &r->headers_in.content_length->value;
str->data = ngx_palloc(r->pool, NGX_OFF_T_LEN);
if (str->data == NULL) {
return ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
}
str->len = ngx_snprintf(str->data, NGX_OFF_T_LEN, "%O", content_length) - str->data;
}
r->headers_in.content_length_n = content_length;
r->phase_handler++;
ngx_http_core_run_phases(r);
ngx_http_finalize_request(r, NGX_DONE);
}
static ngx_int_t
ngx_http_modsecurity_header_filter(ngx_http_request_t *r) {
ngx_http_modsecurity_loc_conf_t *cf;
ngx_http_modsecurity_ctx_t *ctx;
const char *lang;
cf = ngx_http_get_module_loc_conf(r, ngx_http_modsecurity);
ctx = ngx_http_get_module_ctx(r, ngx_http_modsecurity);
if (r != r->main || r->internal || !cf->enable || ctx->complete) {
return ngx_http_next_header_filter(r);
}
if (r->method == NGX_HTTP_HEAD || r->header_only
|| !modsecIsResponseBodyAccessEnabled(ctx->req) ) {
/* TODO: RESPONSE HEADERS PHASE
*/
return ngx_http_next_header_filter(r);
}
/* copy headers_out */
if (ngx_list_copy_to_apr_table(&r->headers_out.headers,
ctx->req->headers_out,
ctx->req->pool) != NGX_OK) {
return NGX_ERROR;
}
ctx->req->content_type = ConvertNgxStringToUTF8(r->headers_out.content_type, ctx->req->pool);
ctx->req->content_encoding = apr_table_get(ctx->req->headers_out, "Content-Encoding");
lang = apr_table_get(ctx->req->headers_out, "Content-Languages");
if(lang != NULL)
{
ctx->req->content_languages = apr_array_make(ctx->req->pool, 1, sizeof(const char *));
*(const char **)apr_array_push(ctx->req->content_languages) = lang;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_modsecurity_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
ngx_http_modsecurity_loc_conf_t *cf;
ngx_http_modsecurity_ctx_t *ctx;
ngx_int_t rc;
apr_off_t content_length;
cf = ngx_http_get_module_loc_conf(r, ngx_http_modsecurity);
ctx = ngx_http_get_module_ctx(r, ngx_http_modsecurity);
if (r != r->main || r->internal || !cf->enable || ctx->complete) {
return ngx_http_next_body_filter(r, in);
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "modSecurity: body filter");
if (in == NULL) {
return NGX_AGAIN;
}
rc = move_chain_to_brigade(in, ctx->brigade, r->pool);
if (rc == NGX_ERROR) {
return NGX_ERROR;
} else if (rc == NGX_AGAIN) {
return NGX_AGAIN;
}
/* last buf has been saved */
ctx->complete = 1;
modsecSetResponseBrigade(ctx->req, ctx->brigade);
rc = modsecProcessResponse(ctx->req);
if (rc == DECLINED || rc == APR_SUCCESS) {
in = NULL;
apr_brigade_length(ctx->brigade, 0, &content_length);
rc = move_brigade_to_chain(ctx->brigade, &in, ctx->r->pool);
if (rc == NGX_ERROR) {
return NGX_ERROR;
}
if (r->headers_out.content_length_n != -1) {
r->headers_out.content_length_n = content_length;
r->headers_out.content_length = NULL; /* header filter will set this */
}
rc = ngx_http_next_header_filter(r);
if (rc == NGX_ERROR || rc > NGX_OK) {
return rc;
}
rc = ngx_http_next_body_filter(r, in);
if (rc == NGX_ERROR || rc >= NGX_HTTP_SPECIAL_RESPONSE) {
return rc;
}
return NGX_OK;
}
if (rc < NGX_HTTP_SPECIAL_RESPONSE || rc >= 600) {
rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
}
return rc; /* ngx_http_filter_finalize_request(r, &ngx_http_modsecurity, rc); */
}
static ngx_http_modsecurity_ctx_t *
ngx_http_modsecurity_create_ctx(ngx_http_request_t *r)
{
ngx_http_modsecurity_loc_conf_t *cf;
ngx_pool_cleanup_t *cln;
ngx_http_modsecurity_ctx_t *ctx;
ngx_list_part_t *part;
ngx_table_elt_t *h;
ngx_uint_t i;
const char *lang;
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_modsecurity_ctx_t));
if (ctx == NULL) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "modSecurity: ctx memory allocation error");
return NULL;
}
cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_modsecurity_ctx_t));
if (cln == NULL) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "modSecurity: ctx memory allocation error");
return NULL;
}
cln->handler = ngx_http_modsecurity_cleanup;
ngx_memzero(cln->data, sizeof(ngx_http_modsecurity_ctx_t));
cln->data = ctx;
ctx = cln->data;
ctx->r = r;
if (r->connection->requests == 0 || ctx->connection == NULL) {
@@ -565,27 +643,31 @@ ngx_http_modsecurity_create_ctx(ngx_http_request_t *r)
ctx->req->parsed_uri.user = NULL;
ctx->req->parsed_uri.fragment = ConvertNgxStringToUTF8(r->exten, ctx->req->pool);
part = &r->headers_in.headers.part;
h = part->elts;
for (i = 0; ; i++) {
if (i >= part->nelts) {
if (part->next == NULL)
break;
part = part->next;
h = part->elts;
i = 0;
}
apr_table_setn(ctx->req->headers_in, ConvertNgxStringToUTF8(h[i].key, ctx->req->pool),
ConvertNgxStringToUTF8(h[i].value, ctx->req->pool));
if (ngx_list_copy_to_apr_table(&r->headers_in.headers,
ctx->req->headers_in,
ctx->req->pool) != NGX_OK) {
return NULL;
}
/* XXX: if mod_uniqid enabled - use it's value */
apr_table_setn(ctx->req->subprocess_env, "UNIQUE_ID", "12345");
/* actually, we need ctx only for POST request body handling - don't like this part */
apr_table_setn(ctx->req->notes, NOTE_NGINX_REQUEST_CTX, (const char *) ctx);
ctx->req->content_encoding = apr_table_get(ctx->req->headers_in, "Content-Encoding");
ctx->req->content_type = apr_table_get(ctx->req->headers_in, "Content-Type");
lang = apr_table_get(ctx->req->headers_in, "Content-Languages");
if(lang != NULL)
{
ctx->req->content_languages = apr_array_make(ctx->req->pool, 1, sizeof(const char *));
*(const char **)apr_array_push(ctx->req->content_languages) = lang;
}
ctx->brigade = apr_brigade_create(ctx->req->pool, ctx->req->connection->bucket_alloc);
if (ctx->brigade == NULL) {
return NULL;
}
return ctx;
}
@@ -599,52 +681,6 @@ ngx_http_modsecurity_cleanup(void *data)
}
}
static void
ngx_http_modsecurity_request_body_handler(ngx_http_request_t *r)
{
ngx_http_modsecurity_ctx_t *ctx;
ngx_int_t rc;
ctx = ngx_http_get_module_ctx(r, ngx_http_modsecurity);
if (ctx == NULL
|| r->request_body->bufs == NULL
|| r->request_body->bufs->next != NULL) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
r->request_body_in_single_buf = ctx->request_body_in_single_buf;
r->request_body_in_file_only = ctx->request_body_in_file_only;
r->header_in = r->request_body->bufs->buf;
ctx->chain = r->request_body->bufs;
r->request_body = NULL;
r->loc_conf = ctx->loc_conf;
rc = modsecProcessRequest(ctx->req);
if (rc != DECLINED) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "ModSecurity: status: %d, need action", rc);
ngx_http_clear_accept_ranges(r);
ngx_http_clear_last_modified(r);
ngx_http_clear_content_length(r);
/* Nginx and Apache share same response code */
if (rc < NGX_HTTP_SPECIAL_RESPONSE) {
rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_http_finalize_request(r, rc);
}
r->phase_handler++;
ngx_http_core_run_phases(r);
ngx_http_finalize_request(r, NGX_DONE);
}
static char *
ngx_http_modsecurity_config(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
@@ -652,7 +688,7 @@ ngx_http_modsecurity_config(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
ngx_str_t *value;
const char *msg;
if (mscf->config != NULL) {
if (mscf->config != NGX_CONF_UNSET_PTR) {
return "is duplicate";
}
@@ -664,14 +700,35 @@ ngx_http_modsecurity_config(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
mscf->config = modsecGetDefaultConfig();
msg = modsecProcessConfig(mscf->config, (const char *)value[1].data, "");
if (mscf->config == NULL) {
return NGX_CONF_ERROR;
}
msg = modsecProcessConfig(mscf->config, (const char *)value[1].data, NULL);
if (msg != NULL) {
ngx_conf_log_error(NGX_LOG_INFO, cf, 0, "modSecurity: modsecProcessConfig() %s", msg);
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "modSecurity: modsecProcessConfig() %s", msg);
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
static char *
ngx_http_modsecurity_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_modsecurity_loc_conf_t *mscf = conf;
char *rc;
rc = ngx_conf_set_flag_slot(cf, cmd, conf);
if (rc != NGX_CONF_OK) {
return rc;
}
if (mscf->enable) {
mscf->file = &cf->conf_file->file.name;
mscf->line = cf->conf_file->line;
}
return NGX_CONF_OK;
}
static int
ngx_http_modsecurity_drop_action(request_rec *r)
@@ -685,3 +742,4 @@ ngx_http_modsecurity_drop_action(request_rec *r)
ctx->r->connection->error = 1;
return 0;
}