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);
110 /* FIXME: Checks for ssl only configuration */
112 auth_header = apr_table_get(req->headers_in, "Authorization");
113 if (!auth_header) goto done;
115 auth_header_type = ap_getword_white(req->pool, &auth_header);
116 if (!auth_header_type) goto done;
118 if (strcasecmp(auth_header_type, "Negotiate") != 0) goto done;
120 auth_header_value = ap_getword_white(req->pool, &auth_header);
121 if (!auth_header_value) goto done;
122 input.length = apr_base64_decode_len(auth_header_value) + 1;
123 input.value = apr_pcalloc(req->pool, input.length);
124 if (!input.value) goto done;
125 input.length = apr_base64_decode(input.value, auth_header_value);
127 /* FIXME: this works only with "one-roundtrip" gssapi auth for now,
128 * should work with Krb, will fail with NTLMSSP */
129 maj = gss_accept_sec_context(&min, &ctx, GSS_C_NO_CREDENTIAL,
130 &input, GSS_C_NO_CHANNEL_BINDINGS,
131 &client, NULL, &output, &flags, NULL,
133 if (GSS_ERROR(maj)) {
134 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
135 mag_error(req, "gss_accept_sec_context() failed",
141 replen = apr_base64_encode_len(output.length) + 1;
142 reply = apr_pcalloc(req->pool, 10 + replen);
143 if (!reply) goto done;
144 memcpy(reply, "Negotiate ", 10);
145 apr_base64_encode(&reply[10], output.value, output.length);
146 reply[replen] = '\0';
147 apr_table_add(req->err_headers_out, "WWW-Authenticate", reply);
150 maj = gss_display_name(&min, client, &name, NULL);
151 if (GSS_ERROR(maj)) {
152 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, req,
153 mag_error(req, "gss_accept_sec_context() failed",
158 /* FIXME: save creds */
160 req->ap_auth_type = "Negotiate";
161 req->user = apr_pstrndup(req->pool, name.value, name.length);
165 if (ret == HTTP_UNAUTHORIZED) {
166 apr_table_add(req->err_headers_out, "WWW-Authenticate", "Negotiate");
168 gss_release_cred(&min, &delegated_cred);
169 gss_release_buffer(&min, &output);
170 gss_release_name(&min, &client);
171 gss_release_buffer(&min, &name);
172 gss_delete_sec_context(&min, &ctx, GSS_C_NO_BUFFER);
177 static void *mag_create_dir_config(apr_pool_t *p, char *dir)
179 struct mag_config *cfg;
181 cfg = (struct mag_config *)apr_pcalloc(p, sizeof(struct mag_config));
182 if (!cfg) return NULL;
187 static const char *mag_ssl_only(cmd_parms *parms, void *mconfig, int on)
189 struct mag_config *cfg = (struct mag_config *)mconfig;
190 cfg->ssl_only = on ? true : false;
194 static const char *mag_save_creds(cmd_parms *parms, void *mconfig, int on)
196 struct mag_config *cfg = (struct mag_config *)mconfig;
197 cfg->save_creds = on ? true : false;
201 static const command_rec mag_commands[] = {
202 AP_INIT_FLAG("GSSSSLOnly", mag_ssl_only, NULL, OR_AUTHCFG,
203 "Work only if connection is SSL Secured"),
204 AP_INIT_FLAG("GSSSaveCreds", mag_save_creds, NULL, OR_AUTHCFG,
210 mag_register_hooks(apr_pool_t *p)
212 ap_hook_check_user_id(mag_auth, NULL, NULL, APR_HOOK_MIDDLE);
215 module AP_MODULE_DECLARE_DATA auth_gssapi_module =
217 STANDARD20_MODULE_STUFF,
218 mag_create_dir_config,