1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include "mod_session.h"
19 #include "apr_strings.h"
21 #include "util_cookies.h"
23 #define MOD_SESSION_COOKIE "mod_session_cookie"
25 module AP_MODULE_DECLARE_DATA session_cookie_module;
28 * Structure to carry the per-dir session config.
33 const char *name_attrs;
36 const char *name2_attrs;
39 } session_cookie_dir_conf;
42 * Set the cookie and embed the session within it.
44 * This function adds an RFC2109 compliant Set-Cookie header for
45 * the cookie specified in SessionCookieName, and an RFC2965 compliant
46 * Set-Cookie2 header for the cookie specified in SessionCookieName2.
48 * If specified, the optional cookie attributes will be added to
49 * each cookie. If defaults are not specified, DEFAULT_ATTRS
52 * On success, this method will return APR_SUCCESS.
54 * @param r The request pointer.
55 * @param z A pointer to where the session will be written.
57 static apr_status_t session_cookie_save(request_rec * r, session_rec * z)
60 session_cookie_dir_conf *conf = ap_get_module_config(r->per_dir_config,
61 &session_cookie_module);
63 /* don't cache auth protected pages */
64 apr_table_addn(r->headers_out, "Cache-Control", "no-cache");
66 /* create RFC2109 compliant cookie */
68 if (z->encoded && z->encoded[0]) {
69 ap_cookie_write(r, conf->name, z->encoded, conf->name_attrs,
70 z->maxage, r->headers_out, r->err_headers_out,
74 ap_cookie_remove(r, conf->name, conf->name_attrs, r->headers_out,
75 r->err_headers_out, NULL);
79 /* create RFC2965 compliant cookie */
80 if (conf->name2_set) {
81 if (z->encoded && z->encoded[0]) {
82 ap_cookie_write2(r, conf->name2, z->encoded, conf->name2_attrs,
83 z->maxage, r->headers_out, r->err_headers_out,
87 ap_cookie_remove2(r, conf->name2, conf->name2_attrs,
88 r->headers_out, r->err_headers_out, NULL);
92 if (conf->name_set || conf->name2_set) {
100 * Isolate the cookie with the name "name", and if present, extract
101 * the payload from the cookie.
103 * If the cookie is found, the cookie and any other cookies with the
104 * same name are removed from the cookies passed in the request, so
105 * that credentials are not leaked to a backend server or process.
107 * A missing or malformed cookie will cause this function to return
110 * On success, this returns APR_SUCCESS.
112 static apr_status_t session_cookie_load(request_rec * r, session_rec ** z)
115 session_cookie_dir_conf *conf = ap_get_module_config(r->per_dir_config,
116 &session_cookie_module);
118 session_rec *zz = NULL;
119 const char *val = NULL;
120 const char *note = NULL;
121 const char *name = NULL;
124 /* find the first redirect */
128 /* find the main request */
133 /* is our session in a cookie? */
134 if (conf->name2_set) {
137 else if (conf->name_set) {
144 /* first look in the notes */
145 note = apr_pstrcat(m->pool, MOD_SESSION_COOKIE, name, NULL);
146 zz = (session_rec *)apr_table_get(m->notes, note);
152 /* otherwise, try parse the cookie */
153 ap_cookie_read(r, name, &val, conf->remove);
155 /* create a new session and return it */
156 zz = (session_rec *) apr_pcalloc(m->pool, sizeof(session_rec));
158 zz->entries = apr_table_make(m->pool, 10);
160 zz->uuid = (apr_uuid_t *) apr_pcalloc(m->pool, sizeof(apr_uuid_t));
163 /* put the session in the notes so we don't have to parse it again */
164 apr_table_setn(m->notes, note, (char *)zz);
172 static void *create_session_cookie_dir_config(apr_pool_t * p, char *dummy)
174 session_cookie_dir_conf *new =
175 (session_cookie_dir_conf *) apr_pcalloc(p, sizeof(session_cookie_dir_conf));
180 static void *merge_session_cookie_dir_config(apr_pool_t * p, void *basev,
183 session_cookie_dir_conf *new = (session_cookie_dir_conf *)
184 apr_pcalloc(p, sizeof(session_cookie_dir_conf));
185 session_cookie_dir_conf *add = (session_cookie_dir_conf *) addv;
186 session_cookie_dir_conf *base = (session_cookie_dir_conf *) basev;
188 new->name = (add->name_set == 0) ? base->name : add->name;
189 new->name_attrs = (add->name_set == 0) ? base->name_attrs : add->name_attrs;
190 new->name_set = add->name_set || base->name_set;
191 new->name2 = (add->name2_set == 0) ? base->name2 : add->name2;
192 new->name2_attrs = (add->name2_set == 0) ? base->name2_attrs : add->name2_attrs;
193 new->name2_set = add->name2_set || base->name2_set;
194 new->remove = (add->remove_set == 0) ? base->remove : add->remove;
195 new->remove_set = add->remove_set || base->remove_set;
201 * Sanity check a given string that it exists, is not empty,
202 * and does not contain special characters.
204 static const char *check_string(cmd_parms * cmd, const char *string)
206 if (!string || !*string || ap_strchr_c(string, '=') || ap_strchr_c(string, '&')) {
207 return apr_pstrcat(cmd->pool, cmd->directive->directive,
208 " cannot be empty, or contain '=' or '&'.",
214 static const char *set_cookie_name(cmd_parms * cmd, void *config,
218 char *line = apr_pstrdup(cmd->pool, args);
219 session_cookie_dir_conf *conf = (session_cookie_dir_conf *) config;
220 char *cookie = apr_strtok(line, " \t", &last);
223 while (apr_isspace(*last)) {
226 conf->name_attrs = last;
227 return check_string(cmd, cookie);
230 static const char *set_cookie_name2(cmd_parms * cmd, void *config,
234 char *line = apr_pstrdup(cmd->pool, args);
235 session_cookie_dir_conf *conf = (session_cookie_dir_conf *) config;
236 char *cookie = apr_strtok(line, " \t", &last);
237 conf->name2 = cookie;
239 while (apr_isspace(*last)) {
242 conf->name2_attrs = last;
243 return check_string(cmd, cookie);
247 set_remove(cmd_parms * parms, void *dconf, int flag)
249 session_cookie_dir_conf *conf = dconf;
252 conf->remove_set = 1;
257 static const command_rec session_cookie_cmds[] =
259 AP_INIT_RAW_ARGS("SessionCookieName", set_cookie_name, NULL, RSRC_CONF|OR_AUTHCFG,
260 "The name of the RFC2109 cookie carrying the session"),
261 AP_INIT_RAW_ARGS("SessionCookieName2", set_cookie_name2, NULL, RSRC_CONF|OR_AUTHCFG,
262 "The name of the RFC2965 cookie carrying the session"),
263 AP_INIT_FLAG("SessionCookieRemove", set_remove, NULL, RSRC_CONF|OR_AUTHCFG,
264 "Set to 'On' to remove the session cookie from the headers "
265 "and hide the cookie from a backend server or process"),
269 static void register_hooks(apr_pool_t * p)
271 ap_hook_session_load(session_cookie_load, NULL, NULL, APR_HOOK_MIDDLE);
272 ap_hook_session_save(session_cookie_save, NULL, NULL, APR_HOOK_MIDDLE);
275 AP_DECLARE_MODULE(session_cookie) =
277 STANDARD20_MODULE_STUFF,
278 create_session_cookie_dir_config, /* dir config creater */
279 merge_session_cookie_dir_config, /* dir merger --- default is to
281 NULL, /* server config */
282 NULL, /* merge server config */
283 session_cookie_cmds, /* command apr_table_t */
284 register_hooks /* register hooks */