forked from yaoweibin/nginx_secure_cookie_module
/
ngx_http_secure_cookie_module.c
490 lines (359 loc) · 12.6 KB
/
ngx_http_secure_cookie_module.c
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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_md5.h>
typedef struct {
ngx_http_complex_value_t *variable;
ngx_http_complex_value_t *md5;
ngx_http_complex_value_t *md5_number;
time_t expires;
} ngx_http_secure_cookie_conf_t;
static ngx_int_t ngx_http_secure_cookie_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_secure_cookie_set_md5_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_secure_cookie_md5_number(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_secure_cookie_set_expires_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_secure_cookie_set_expires_base64_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static void *ngx_http_secure_cookie_create_conf(ngx_conf_t *cf);
static char *ngx_http_secure_cookie_merge_conf(ngx_conf_t *cf, void *parent,
void *child);
static ngx_int_t ngx_http_secure_cookie_add_variables(ngx_conf_t *cf);
static ngx_command_t ngx_http_secure_cookie_commands[] = {
{ ngx_string("secure_cookie"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_set_complex_value_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_secure_cookie_conf_t, variable),
NULL },
{ ngx_string("secure_cookie_md5"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_set_complex_value_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_secure_cookie_conf_t, md5),
NULL },
{ ngx_string("secure_cookie_md5_to_number"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_set_complex_value_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_secure_cookie_conf_t, md5_number),
NULL },
{ ngx_string("secure_cookie_expires"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_sec_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_secure_cookie_conf_t, expires),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_secure_cookie_module_ctx = {
ngx_http_secure_cookie_add_variables, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_secure_cookie_create_conf, /* create location configuration */
ngx_http_secure_cookie_merge_conf /* merge location configuration */
};
ngx_module_t ngx_http_secure_cookie_module = {
NGX_MODULE_V1,
&ngx_http_secure_cookie_module_ctx, /* module context */
ngx_http_secure_cookie_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
};
static ngx_http_variable_t ngx_http_secure_cookie_vars[] = {
{ ngx_string("secure_cookie"), NULL,
ngx_http_secure_cookie_variable, 0,
NGX_HTTP_VAR_NOHASH, 0 },
{ ngx_string("secure_cookie_set_md5"), NULL,
ngx_http_secure_cookie_set_md5_variable, 0,
NGX_HTTP_VAR_NOHASH, 0 },
{ ngx_string("secure_cookie_md5_number"), NULL,
ngx_http_secure_cookie_md5_number, 0,
NGX_HTTP_VAR_NOHASH, 0 },
{ ngx_string("secure_cookie_set_expires"), NULL,
ngx_http_secure_cookie_set_expires_variable, 0,
NGX_HTTP_VAR_NOHASH, 0 },
{ ngx_string("secure_cookie_set_expires_base64"), NULL,
ngx_http_secure_cookie_set_expires_base64_variable, 0,
NGX_HTTP_VAR_NOHASH, 0 },
{ ngx_null_string, NULL, NULL, 0, 0, 0 }
};
static ngx_int_t
ngx_http_secure_cookie_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char hash_buf[16], md5_buf[16], time_buf[64];
u_char *p, *last;
ngx_str_t val, hash, time_dst, time_src;
time_t expires;
ngx_md5_t md5;
ngx_http_secure_cookie_conf_t *conf;
conf = ngx_http_get_module_loc_conf(r, ngx_http_secure_cookie_module);
if (conf->variable == NULL || conf->md5 == NULL) {
goto not_found;
}
if (ngx_http_complex_value(r, conf->variable, &val) != NGX_OK) {
return NGX_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"secure cookie: \"%V\"", &val);
last = val.data + val.len;
p = ngx_strlchr(val.data, last, ',');
expires = 0;
if (p) {
val.len = p++ - val.data;
time_src.data = p;
time_src.len = last - p;
if (time_src.len > 64) {
goto not_found;
}
time_dst.data = time_buf;
time_dst.len = 64;
if (ngx_decode_base64(&time_dst, &time_src) != NGX_OK) {
goto not_found;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"secure time: \"%V\"", &time_dst);
expires = ngx_http_parse_time(time_dst.data, time_dst.len);
if (expires <= 0) {
goto not_found;
}
}
if (val.len > 24) {
goto not_found;
}
hash.len = 16;
hash.data = hash_buf;
if (ngx_decode_base64(&hash, &val) != NGX_OK) {
goto not_found;
}
if (hash.len != 16) {
goto not_found;
}
if (ngx_http_complex_value(r, conf->md5, &val) != NGX_OK) {
return NGX_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"secure cookie md5: \"%V\"", &val);
ngx_md5_init(&md5);
ngx_md5_update(&md5, val.data, val.len);
ngx_md5_final(md5_buf, &md5);
if (ngx_memcmp(hash_buf, md5_buf, 16) != 0) {
goto not_found;
}
v->data = (u_char *) ((expires && expires < ngx_time()) ? "0" : "1");
v->len = 1;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
return NGX_OK;
not_found:
v->not_found = 1;
return NGX_OK;
}
static ngx_int_t
ngx_http_secure_cookie_set_md5_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char md5_buf[16];
ngx_str_t res, val;
ngx_md5_t md5;
ngx_http_secure_cookie_conf_t *sclcf;
sclcf = ngx_http_get_module_loc_conf(r, ngx_http_secure_cookie_module);
if (sclcf == NULL) {
goto not_found;
}
if (ngx_http_complex_value(r, sclcf->md5, &val) != NGX_OK) {
goto not_found;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"secure cookie set md5 base string: \"%V\"", &val);
ngx_md5_init(&md5);
ngx_md5_update(&md5, val.data, val.len);
ngx_md5_final(md5_buf, &md5);
res.len = 24;
res.data = ngx_pcalloc(r->pool, res.len);
if (res.data == NULL) {
goto not_found;
}
val.len = 16;
val.data = md5_buf;
ngx_encode_base64(&res, &val);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"secure cookie set md5 base64: \"%V\"", &res);
v->len = res.len;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
v->data = res.data;
return NGX_OK;
not_found:
v->not_found = 1;
return NGX_OK;
}
static ngx_int_t
ngx_http_secure_cookie_md5_number(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char *last;
ngx_str_t number, val;
ngx_uint_t hash;
ngx_http_secure_cookie_conf_t *sclcf;
sclcf = ngx_http_get_module_loc_conf(r, ngx_http_secure_cookie_module);
if (sclcf == NULL) {
goto not_found;
}
if (sclcf->md5_number == NULL) {
goto not_found;
}
if (ngx_http_complex_value(r, sclcf->md5_number, &val) != NGX_OK) {
goto not_found;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"secure cookie md5 number base string: \"%V\"", &val);
if (val.len == 0) {
goto not_found;
}
hash = ngx_hash_key(val.data, val.len);
number.len = 32;
number.data = ngx_pcalloc(r->pool, number.len);
if (number.data == NULL) {
goto not_found;
}
last = ngx_snprintf(number.data, number.len, "%ud", hash);
number.len = last - number.data;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"secure cookie md5 number: \"%V\"", &number);
v->len = number.len;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
v->data = number.data;
return NGX_OK;
not_found:
v->not_found = 1;
return NGX_OK;
}
static ngx_int_t
ngx_http_secure_cookie_set_expires_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char *last, *time;
time_t expires;
ngx_http_secure_cookie_conf_t *sclcf;
sclcf = ngx_http_get_module_loc_conf(r, ngx_http_secure_cookie_module);
if (sclcf == NULL) {
goto not_found;
}
time = ngx_palloc(r->pool, sizeof("Mon, 28 Sep 1970 06:00:00 GMT"));
if (time == NULL) {
goto not_found;
}
expires = ngx_time() + sclcf->expires;
last = ngx_http_cookie_time(time, expires);
v->len = last - time;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
v->data = time;
return NGX_OK;
not_found:
v->not_found = 1;
return NGX_OK;
}
static ngx_int_t
ngx_http_secure_cookie_set_expires_base64_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char *last, t[32], *base64;
time_t expires;
ngx_str_t time, time_base64;
ngx_http_secure_cookie_conf_t *sclcf;
sclcf = ngx_http_get_module_loc_conf(r, ngx_http_secure_cookie_module);
if (sclcf == NULL) {
goto not_found;
}
base64 = ngx_palloc(r->pool, 64);
if ( base64 == NULL) {
goto not_found;
}
expires = ngx_time() + sclcf->expires;
last = ngx_http_cookie_time(t, expires);
time.data = t;
time.len = last - t;
time_base64.data = base64;
time_base64.len = 64;
ngx_encode_base64(&time_base64, &time);
v->len = time_base64.len;
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
v->data = time_base64.data;
return NGX_OK;
not_found:
v->not_found = 1;
return NGX_OK;
}
static void *
ngx_http_secure_cookie_create_conf(ngx_conf_t *cf)
{
ngx_http_secure_cookie_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_secure_cookie_conf_t));
if (conf == NULL) {
return NULL;
}
/*
* set by ngx_pcalloc():
*
* conf->variable = NULL;
* conf->md5 = NULL;
* conf->md5_number = NULL;
* conf->expires = 0;
*/
conf->expires = NGX_CONF_UNSET;
return conf;
}
static char *
ngx_http_secure_cookie_merge_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_secure_cookie_conf_t *prev = parent;
ngx_http_secure_cookie_conf_t *conf = child;
if (conf->variable == NULL) {
conf->variable = prev->variable;
}
if (conf->md5 == NULL) {
conf->md5 = prev->md5;
}
if (conf->md5_number == NULL) {
conf->md5_number = prev->md5_number;
}
ngx_conf_merge_sec_value(conf->expires, prev->expires, 24 * 60 * 60);
return NGX_CONF_OK;
}
static ngx_int_t
ngx_http_secure_cookie_add_variables(ngx_conf_t *cf)
{
ngx_http_variable_t *var, *v;
for (v = ngx_http_secure_cookie_vars; v->name.len; v++) {
var = ngx_http_add_variable(cf, &v->name, v->flags);
if (var == NULL) {
return NGX_ERROR;
}
var->get_handler = v->get_handler;
var->data = v->data;
}
return NGX_OK;
}