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DEFINITIONS
This source file includes following definitions.
- __gsskrb5_ccache_lifetime
- get_keytab
1 /*
2 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include "krb5/gsskrb5_locl.h"
35
36 RCSID("$Id$");
37
38 OM_uint32
39 __gsskrb5_ccache_lifetime(OM_uint32 *minor_status,
/* [<][>][^][v][top][bottom][index][help] */
40 krb5_context context,
41 krb5_ccache id,
42 krb5_principal principal,
43 OM_uint32 *lifetime)
44 {
45 krb5_creds in_cred, *out_cred;
46 krb5_const_realm realm;
47 krb5_error_code kret;
48
49 memset(&in_cred, 0, sizeof(in_cred));
50 in_cred.client = principal;
51
52 realm = krb5_principal_get_realm(context, principal);
53 if (realm == NULL) {
54 _gsskrb5_clear_status ();
55 *minor_status = KRB5_PRINC_NOMATCH; /* XXX */
56 return GSS_S_FAILURE;
57 }
58
59 kret = krb5_make_principal(context, &in_cred.server,
60 realm, KRB5_TGS_NAME, realm, NULL);
61 if (kret) {
62 *minor_status = kret;
63 return GSS_S_FAILURE;
64 }
65
66 kret = krb5_get_credentials(context, 0,
67 id, &in_cred, &out_cred);
68 krb5_free_principal(context, in_cred.server);
69 if (kret) {
70 *minor_status = kret;
71 return GSS_S_FAILURE;
72 }
73
74 *lifetime = out_cred->times.endtime;
75 krb5_free_creds(context, out_cred);
76
77 return GSS_S_COMPLETE;
78 }
79
80
81
82
83 static krb5_error_code
84 get_keytab(krb5_context context, krb5_keytab *keytab)
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85 {
86 char kt_name[256];
87 krb5_error_code kret;
88
89 HEIMDAL_MUTEX_lock(&gssapi_keytab_mutex);
90
91 if (_gsskrb5_keytab != NULL) {
92 kret = krb5_kt_get_name(context,
93 _gsskrb5_keytab,
94 kt_name, sizeof(kt_name));
95 if (kret == 0)
96 kret = krb5_kt_resolve(context, kt_name, keytab);
97 } else
98 kret = krb5_kt_default(context, keytab);
99
100 HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);
101
102 return (kret);
103 }
104
105 static OM_uint32 acquire_initiator_cred
106 (OM_uint32 * minor_status,
107 krb5_context context,
108 const gss_name_t desired_name,
109 OM_uint32 time_req,
110 const gss_OID_set desired_mechs,
111 gss_cred_usage_t cred_usage,
112 gsskrb5_cred handle,
113 gss_OID_set * actual_mechs,
114 OM_uint32 * time_rec
115 )
116 {
117 OM_uint32 ret;
118 krb5_creds cred;
119 krb5_principal def_princ;
120 krb5_get_init_creds_opt *opt;
121 krb5_ccache ccache;
122 krb5_keytab keytab;
123 krb5_error_code kret;
124
125 keytab = NULL;
126 ccache = NULL;
127 def_princ = NULL;
128 ret = GSS_S_FAILURE;
129 memset(&cred, 0, sizeof(cred));
130
131 /*
132 * If we have a preferred principal, lets try to find it in all
133 * caches, otherwise, fall back to default cache, ignore all
134 * errors while searching.
135 */
136
137 if (handle->principal) {
138 kret = krb5_cc_cache_match (context,
139 handle->principal,
140 &ccache);
141 if (kret == 0) {
142 ret = GSS_S_COMPLETE;
143 goto found;
144 }
145 }
146
147 if (ccache == NULL) {
148 kret = krb5_cc_default(context, &ccache);
149 if (kret)
150 goto end;
151 }
152 kret = krb5_cc_get_principal(context, ccache, &def_princ);
153 if (kret != 0) {
154 /* we'll try to use a keytab below */
155 krb5_cc_close(context, ccache);
156 def_princ = NULL;
157 kret = 0;
158 } else if (handle->principal == NULL) {
159 kret = krb5_copy_principal(context, def_princ, &handle->principal);
160 if (kret)
161 goto end;
162 } else if (handle->principal != NULL &&
163 krb5_principal_compare(context, handle->principal,
164 def_princ) == FALSE) {
165 krb5_free_principal(context, def_princ);
166 def_princ = NULL;
167 krb5_cc_close(context, ccache);
168 ccache = NULL;
169 }
170 if (def_princ == NULL) {
171 /* We have no existing credentials cache,
172 * so attempt to get a TGT using a keytab.
173 */
174 if (handle->principal == NULL) {
175 kret = krb5_get_default_principal(context, &handle->principal);
176 if (kret)
177 goto end;
178 }
179 kret = get_keytab(context, &keytab);
180 if (kret)
181 goto end;
182 kret = krb5_get_init_creds_opt_alloc(context, &opt);
183 if (kret)
184 goto end;
185 kret = krb5_get_init_creds_keytab(context, &cred,
186 handle->principal, keytab, 0, NULL, opt);
187 krb5_get_init_creds_opt_free(context, opt);
188 if (kret)
189 goto end;
190 kret = krb5_cc_gen_new(context, &krb5_mcc_ops, &ccache);
191 if (kret)
192 goto end;
193 kret = krb5_cc_initialize(context, ccache, cred.client);
194 if (kret) {
195 krb5_cc_destroy(context, ccache);
196 goto end;
197 }
198 kret = krb5_cc_store_cred(context, ccache, &cred);
199 if (kret) {
200 krb5_cc_destroy(context, ccache);
201 goto end;
202 }
203 handle->lifetime = cred.times.endtime;
204 handle->cred_flags |= GSS_CF_DESTROY_CRED_ON_RELEASE;
205 } else {
206
207 ret = __gsskrb5_ccache_lifetime(minor_status,
208 context,
209 ccache,
210 handle->principal,
211 &handle->lifetime);
212 if (ret != GSS_S_COMPLETE) {
213 krb5_cc_close(context, ccache);
214 goto end;
215 }
216 kret = 0;
217 }
218 found:
219 handle->ccache = ccache;
220 ret = GSS_S_COMPLETE;
221
222 end:
223 if (cred.client != NULL)
224 krb5_free_cred_contents(context, &cred);
225 if (def_princ != NULL)
226 krb5_free_principal(context, def_princ);
227 if (keytab != NULL)
228 krb5_kt_close(context, keytab);
229 if (ret != GSS_S_COMPLETE && kret != 0)
230 *minor_status = kret;
231 return (ret);
232 }
233
234 static OM_uint32 acquire_acceptor_cred
235 (OM_uint32 * minor_status,
236 krb5_context context,
237 const gss_name_t desired_name,
238 OM_uint32 time_req,
239 const gss_OID_set desired_mechs,
240 gss_cred_usage_t cred_usage,
241 gsskrb5_cred handle,
242 gss_OID_set * actual_mechs,
243 OM_uint32 * time_rec
244 )
245 {
246 OM_uint32 ret;
247 krb5_error_code kret;
248
249 ret = GSS_S_FAILURE;
250 kret = get_keytab(context, &handle->keytab);
251 if (kret)
252 goto end;
253
254 /* check that the requested principal exists in the keytab */
255 if (handle->principal) {
256 krb5_keytab_entry entry;
257
258 kret = krb5_kt_get_entry(context, handle->keytab,
259 handle->principal, 0, 0, &entry);
260 if (kret)
261 goto end;
262 krb5_kt_free_entry(context, &entry);
263 ret = GSS_S_COMPLETE;
264 } else {
265 /*
266 * Check if there is at least one entry in the keytab before
267 * declaring it as an useful keytab.
268 */
269 krb5_keytab_entry tmp;
270 krb5_kt_cursor c;
271
272 kret = krb5_kt_start_seq_get (context, handle->keytab, &c);
273 if (kret)
274 goto end;
275 if (krb5_kt_next_entry(context, handle->keytab, &tmp, &c) == 0) {
276 krb5_kt_free_entry(context, &tmp);
277 ret = GSS_S_COMPLETE; /* ok found one entry */
278 }
279 krb5_kt_end_seq_get (context, handle->keytab, &c);
280 }
281 end:
282 if (ret != GSS_S_COMPLETE) {
283 if (handle->keytab != NULL)
284 krb5_kt_close(context, handle->keytab);
285 if (kret != 0) {
286 *minor_status = kret;
287 }
288 }
289 return (ret);
290 }
291
292 OM_uint32 _gsskrb5_acquire_cred
293 (OM_uint32 * minor_status,
294 const gss_name_t desired_name,
295 OM_uint32 time_req,
296 const gss_OID_set desired_mechs,
297 gss_cred_usage_t cred_usage,
298 gss_cred_id_t * output_cred_handle,
299 gss_OID_set * actual_mechs,
300 OM_uint32 * time_rec
301 )
302 {
303 krb5_context context;
304 gsskrb5_cred handle;
305 OM_uint32 ret;
306
307 if (cred_usage != GSS_C_ACCEPT && cred_usage != GSS_C_INITIATE && cred_usage != GSS_C_BOTH) {
308 *minor_status = GSS_KRB5_S_G_BAD_USAGE;
309 return GSS_S_FAILURE;
310 }
311
312 GSSAPI_KRB5_INIT(&context);
313
314 *output_cred_handle = NULL;
315 if (time_rec)
316 *time_rec = 0;
317 if (actual_mechs)
318 *actual_mechs = GSS_C_NO_OID_SET;
319
320 if (desired_mechs) {
321 int present = 0;
322
323 ret = gss_test_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
324 desired_mechs, &present);
325 if (ret)
326 return ret;
327 if (!present) {
328 *minor_status = 0;
329 return GSS_S_BAD_MECH;
330 }
331 }
332
333 handle = calloc(1, sizeof(*handle));
334 if (handle == NULL) {
335 *minor_status = ENOMEM;
336 return (GSS_S_FAILURE);
337 }
338
339 HEIMDAL_MUTEX_init(&handle->cred_id_mutex);
340
341 if (desired_name != GSS_C_NO_NAME) {
342
343 ret = _gsskrb5_canon_name(minor_status, context, 0, desired_name,
344 &handle->principal);
345 if (ret) {
346 HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
347 free(handle);
348 return ret;
349 }
350 }
351 if (cred_usage == GSS_C_INITIATE || cred_usage == GSS_C_BOTH) {
352 ret = acquire_initiator_cred(minor_status, context,
353 desired_name, time_req,
354 desired_mechs, cred_usage, handle,
355 actual_mechs, time_rec);
356 if (ret != GSS_S_COMPLETE) {
357 HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
358 krb5_free_principal(context, handle->principal);
359 free(handle);
360 return (ret);
361 }
362 }
363 if (cred_usage == GSS_C_ACCEPT || cred_usage == GSS_C_BOTH) {
364 ret = acquire_acceptor_cred(minor_status, context,
365 desired_name, time_req,
366 desired_mechs, cred_usage, handle, actual_mechs, time_rec);
367 if (ret != GSS_S_COMPLETE) {
368 HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
369 krb5_free_principal(context, handle->principal);
370 free(handle);
371 return (ret);
372 }
373 }
374 ret = gss_create_empty_oid_set(minor_status, &handle->mechanisms);
375 if (ret == GSS_S_COMPLETE)
376 ret = gss_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
377 &handle->mechanisms);
378 if (ret == GSS_S_COMPLETE)
379 ret = _gsskrb5_inquire_cred(minor_status, (gss_cred_id_t)handle,
380 NULL, time_rec, NULL, actual_mechs);
381 if (ret != GSS_S_COMPLETE) {
382 if (handle->mechanisms != NULL)
383 gss_release_oid_set(NULL, &handle->mechanisms);
384 HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
385 krb5_free_principal(context, handle->principal);
386 free(handle);
387 return (ret);
388 }
389 *minor_status = 0;
390 if (time_rec) {
391 ret = _gsskrb5_lifetime_left(minor_status,
392 context,
393 handle->lifetime,
394 time_rec);
395
396 if (ret)
397 return ret;
398 }
399 handle->usage = cred_usage;
400 *output_cred_handle = (gss_cred_id_t)handle;
401 return (GSS_S_COMPLETE);
402 }