4 Copyright (C) 2014 Simo Sorce <simo@redhat.com>
6 Permission is hereby granted, free of charge, to any person obtaining a
7 copy of this software and associated documentation files (the "Software"),
8 to deal in the Software without restriction, including without limitation
9 the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 and/or sell copies of the Software, and to permit persons to whom the
11 Software is furnished to do so, subject to the following conditions:
13 The above copyright notice and this permission notice shall be included in
14 all copies or substantial portions of the Software.
16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 DEALINGS IN THE SOFTWARE.
27 #include <gssapi/gssapi.h>
28 #include <gssapi/gssapi_ext.h>
31 #include <http_core.h>
33 #include <http_request.h>
34 #include <apr_strings.h>
35 #include <apr_base64.h>
37 module AP_MODULE_DECLARE_DATA auth_gssapi_module;
42 gss_key_value_set_desc cred_store;
45 static char *mag_status(request_rec *req, int type, uint32_t err)
47 uint32_t maj_ret, min_ret;
56 maj_ret = gss_display_status(&min_ret, err, type,
57 GSS_C_NO_OID, &msg_ctx, &text);
58 if (maj_ret != GSS_S_COMPLETE) {
64 msg_ret = apr_psprintf(req->pool, "%s, %*s",
65 msg_ret, len, (char *)text.value);
67 msg_ret = apr_psprintf(req->pool, "%*s", len, (char *)text.value);
69 gss_release_buffer(&min_ret, &text);
70 } while (msg_ctx != 0);
75 static char *mag_error(request_rec *req, const char *msg,
76 uint32_t maj, uint32_t min)
81 msg_maj = mag_status(req, GSS_C_GSS_CODE, maj);
82 msg_min = mag_status(req, GSS_C_MECH_CODE, min);
83 return apr_psprintf(req->pool, "%s: [%s (%s)]", msg, msg_maj, msg_min);
86 static int mag_auth(request_rec *req)
89 struct mag_config *cfg;
90 const char *auth_header;
91 char *auth_header_type;
92 char *auth_header_value;
93 int ret = HTTP_UNAUTHORIZED;
94 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
95 gss_buffer_desc input = GSS_C_EMPTY_BUFFER;
96 gss_buffer_desc output = GSS_C_EMPTY_BUFFER;
97 gss_buffer_desc name = GSS_C_EMPTY_BUFFER;
98 gss_name_t client = GSS_C_NO_NAME;
99 gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
105 gss_OID mech_type = GSS_C_NO_OID;
106 gss_buffer_desc lname = GSS_C_EMPTY_BUFFER;
108 type = ap_auth_type(req);
109 if ((type == NULL) || (strcasecmp(type, "GSSAPI") != 0)) {
113 cfg = ap_get_module_config(req->per_dir_config, &auth_gssapi_module);
116 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
117 "FIXME: check for ssl!");
120 auth_header = apr_table_get(req->headers_in, "Authorization");
121 if (!auth_header) goto done;
123 auth_header_type = ap_getword_white(req->pool, &auth_header);
124 if (!auth_header_type) goto done;
126 if (strcasecmp(auth_header_type, "Negotiate") != 0) goto done;
128 auth_header_value = ap_getword_white(req->pool, &auth_header);
129 if (!auth_header_value) goto done;
130 input.length = apr_base64_decode_len(auth_header_value) + 1;
131 input.value = apr_pcalloc(req->pool, input.length);
132 if (!input.value) goto done;
133 input.length = apr_base64_decode(input.value, auth_header_value);
135 /* FIXME: this works only with "one-roundtrip" gssapi auth for now,
136 * should work with Krb, will fail with NTLMSSP */
137 maj = gss_accept_sec_context(&min, &ctx, GSS_C_NO_CREDENTIAL,
138 &input, GSS_C_NO_CHANNEL_BINDINGS,
139 &client, &mech_type, &output, &flags, NULL,
141 if (GSS_ERROR(maj)) {
142 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
143 mag_error(req, "gss_accept_sec_context() failed",
149 replen = apr_base64_encode_len(output.length) + 1;
150 reply = apr_pcalloc(req->pool, 10 + replen);
151 if (!reply) goto done;
152 memcpy(reply, "Negotiate ", 10);
153 apr_base64_encode(&reply[10], output.value, output.length);
154 reply[replen] = '\0';
155 apr_table_add(req->err_headers_out, "WWW-Authenticate", reply);
158 maj = gss_display_name(&min, client, &name, NULL);
159 if (GSS_ERROR(maj)) {
160 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
161 mag_error(req, "gss_accept_sec_context() failed",
166 #ifdef HAVE_GSS_STORE_CRED_INTO
167 if (cfg->cred_store && delegated_cred != GSS_C_NO_CREDENTIAL) {
168 gss_key_value_set_desc store = {0, NULL};
169 /* FIXME: run substtutions */
171 maj = gss_store_cred_into(&min, delegated_cred, GSS_C_INITIATE,
172 GSS_C_NULL_OID, 1, 1, &store, NULL, NULL);
176 req->ap_auth_type = apr_pstrdup(req->pool, "Negotiate");
178 /* Always set the GSS name in an env var */
179 clientname = apr_pstrndup(req->pool, name.value, name.length);
180 apr_table_set(req->subprocess_env, "GSS_NAME", clientname);
182 if (cfg->map_to_local) {
183 maj = gss_localname(&min, client, mech_type, &lname);
184 if (maj != GSS_S_COMPLETE) {
185 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
186 mag_error(req, "gss_localname() failed", maj, min));
189 req->user = apr_pstrndup(req->pool, lname.value, lname.length);
191 req->user = clientname;
196 if (ret == HTTP_UNAUTHORIZED) {
197 apr_table_add(req->err_headers_out, "WWW-Authenticate", "Negotiate");
199 gss_release_cred(&min, &delegated_cred);
200 gss_release_buffer(&min, &output);
201 gss_release_name(&min, &client);
202 gss_release_buffer(&min, &name);
203 gss_delete_sec_context(&min, &ctx, GSS_C_NO_BUFFER);
204 gss_release_buffer(&min, &lname);
209 static void *mag_create_dir_config(apr_pool_t *p, char *dir)
211 struct mag_config *cfg;
213 cfg = (struct mag_config *)apr_pcalloc(p, sizeof(struct mag_config));
214 if (!cfg) return NULL;
219 static const char *mag_ssl_only(cmd_parms *parms, void *mconfig, int on)
221 struct mag_config *cfg = (struct mag_config *)mconfig;
222 cfg->ssl_only = on ? true : false;
226 static const char *mag_map_to_local(cmd_parms *parms, void *mconfig, int on)
228 struct mag_config *cfg = (struct mag_config *)mconfig;
229 cfg->map_to_local = on ? true : false;
233 static const char *mag_cred_store(cmd_parms *parms, void *mconfig,
236 struct mag_config *cfg = (struct mag_config *)mconfig;
237 gss_key_value_element_desc *elements;
246 ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
247 "%s [%s]", "Invalid syntax for GSSCredStore option", w);
251 key = apr_pstrndup(parms->pool, w, (p-w));
252 value = apr_pstrdup(parms->pool, p + 1);
253 if (!key || !value) {
254 ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
255 "%s", "OOM handling GSSCredStore option");
259 size = sizeof(gss_key_value_element_desc) * cfg->cred_store.count + 1;
260 elements = apr_palloc(parms->pool, size);
262 ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, parms->server,
263 "%s", "OOM handling GSSCredStore option");
267 for (count = 0; count < cfg->cred_store.count; count++) {
268 elements[count] = cfg->cred_store.elements[count];
270 elements[count].key = key;
271 elements[count].value = value;
273 cfg->cred_store.elements = elements;
274 cfg->cred_store.count = count;
279 static const command_rec mag_commands[] = {
280 AP_INIT_FLAG("GSSSSLOnly", mag_ssl_only, NULL, OR_AUTHCFG,
281 "Work only if connection is SSL Secured"),
282 AP_INIT_FLAG("GSSLocalName", mag_map_to_local, NULL, OR_AUTHCFG,
283 "Work only if connection is SSL Secured"),
284 AP_INIT_ITERATE("GSSCredStore", mag_cred_store, NULL, OR_AUTHCFG,
290 mag_register_hooks(apr_pool_t *p)
292 ap_hook_check_user_id(mag_auth, NULL, NULL, APR_HOOK_MIDDLE);
295 module AP_MODULE_DECLARE_DATA auth_gssapi_module =
297 STANDARD20_MODULE_STUFF,
298 mag_create_dir_config,