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>
30 #include <http_core.h>
32 #include <http_request.h>
33 #include <apr_strings.h>
34 #include <apr_base64.h>
36 module AP_MODULE_DECLARE_DATA mag_module;
43 static char *mag_status(request_rec *req, int type, uint32_t err)
45 uint32_t maj_ret, min_ret;
54 maj_ret = gss_display_status(&min_ret, err, type,
55 GSS_C_NO_OID, &msg_ctx, &text);
56 if (maj_ret != GSS_S_COMPLETE) {
62 msg_ret = apr_psprintf(req->pool, "%s, %*s",
63 msg_ret, len, (char *)text.value);
65 msg_ret = apr_psprintf(req->pool, "%*s", len, (char *)text.value);
67 gss_release_buffer(&min_ret, &text);
68 } while (msg_ctx != 0);
73 static char *mag_error(request_rec *req, const char *msg,
74 uint32_t maj, uint32_t min)
79 msg_maj = mag_status(req, GSS_C_GSS_CODE, maj);
80 msg_min = mag_status(req, GSS_C_MECH_CODE, min);
81 return apr_psprintf(req->pool, "%s: [%s (%s)]", msg, msg_maj, msg_min);
84 static int mag_auth(request_rec *req)
87 struct mag_config *cfg;
88 const char *auth_header;
89 char *auth_header_type;
90 char *auth_header_value;
91 int ret = HTTP_UNAUTHORIZED;
92 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
93 gss_buffer_desc input = GSS_C_EMPTY_BUFFER;
94 gss_buffer_desc output = GSS_C_EMPTY_BUFFER;
95 gss_buffer_desc name = GSS_C_EMPTY_BUFFER;
96 gss_name_t client = GSS_C_NO_NAME;
97 gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
103 type = ap_auth_type(req);
104 if ((type == NULL) || (strcasecmp(type, "GSSAPI") != 0)) {
108 cfg = ap_get_module_config(req->per_dir_config, &mag_module);
111 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
112 "FIXME: check for ssl!");
115 auth_header = apr_table_get(req->headers_in, "Authorization");
116 if (!auth_header) goto done;
118 auth_header_type = ap_getword_white(req->pool, &auth_header);
119 if (!auth_header_type) goto done;
121 if (strcasecmp(auth_header_type, "Negotiate") != 0) goto done;
123 auth_header_value = ap_getword_white(req->pool, &auth_header);
124 if (!auth_header_value) goto done;
125 input.length = apr_base64_decode_len(auth_header_value) + 1;
126 input.value = apr_pcalloc(req->pool, input.length);
127 if (!input.value) goto done;
128 input.length = apr_base64_decode(input.value, auth_header_value);
130 /* FIXME: this works only with "one-roundtrip" gssapi auth for now,
131 * should work with Krb, will fail with NTLMSSP */
132 maj = gss_accept_sec_context(&min, &ctx, GSS_C_NO_CREDENTIAL,
133 &input, GSS_C_NO_CHANNEL_BINDINGS,
134 &client, NULL, &output, &flags, NULL,
136 if (GSS_ERROR(maj)) {
137 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
138 mag_error(req, "gss_accept_sec_context() failed",
144 replen = apr_base64_encode_len(output.length) + 1;
145 reply = apr_pcalloc(req->pool, 10 + replen);
146 if (!reply) goto done;
147 memcpy(reply, "Negotiate ", 10);
148 apr_base64_encode(&reply[10], output.value, output.length);
149 reply[replen] = '\0';
150 apr_table_add(req->err_headers_out, "WWW-Authenticate", reply);
153 maj = gss_display_name(&min, client, &name, NULL);
154 if (GSS_ERROR(maj)) {
155 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
156 mag_error(req, "gss_accept_sec_context() failed",
161 /* FIXME: save creds */
163 req->ap_auth_type = apr_pstrdup(req->pool, "Negotiate");
164 req->user = apr_pstrndup(req->pool, name.value, name.length);
168 if (ret == HTTP_UNAUTHORIZED) {
169 apr_table_add(req->err_headers_out, "WWW-Authenticate", "Negotiate");
171 gss_release_cred(&min, &delegated_cred);
172 gss_release_buffer(&min, &output);
173 gss_release_name(&min, &client);
174 gss_release_buffer(&min, &name);
175 gss_delete_sec_context(&min, &ctx, GSS_C_NO_BUFFER);
180 static void *mag_create_dir_config(apr_pool_t *p, char *dir)
182 struct mag_config *cfg;
184 cfg = (struct mag_config *)apr_pcalloc(p, sizeof(struct mag_config));
185 if (!cfg) return NULL;
190 static const char *mag_ssl_only(cmd_parms *parms, void *mconfig, int on)
192 struct mag_config *cfg = (struct mag_config *)mconfig;
193 cfg->ssl_only = on ? true : false;
197 static const char *mag_save_creds(cmd_parms *parms, void *mconfig, int on)
199 struct mag_config *cfg = (struct mag_config *)mconfig;
200 cfg->save_creds = on ? true : false;
204 static const command_rec mag_commands[] = {
205 AP_INIT_FLAG("GSSSSLOnly", mag_ssl_only, NULL, OR_AUTHCFG,
206 "Work only if connection is SSL Secured"),
207 AP_INIT_FLAG("GSSSaveCreds", mag_save_creds, NULL, OR_AUTHCFG,
213 mag_register_hooks(apr_pool_t *p)
215 ap_hook_check_user_id(mag_auth, NULL, NULL, APR_HOOK_MIDDLE);
218 module AP_MODULE_DECLARE_DATA auth_gssapi_module =
220 STANDARD20_MODULE_STUFF,
221 mag_create_dir_config,