source: heimdal/trunk/lib/gssapi/krb5/acquire_cred.c

Last change on this file was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 11.8 KB
Line 
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 "gsskrb5_locl.h"
35
36OM_uint32
37__gsskrb5_ccache_lifetime(OM_uint32 *minor_status,
38 krb5_context context,
39 krb5_ccache id,
40 krb5_principal principal,
41 OM_uint32 *lifetime)
42{
43 krb5_creds in_cred, out_cred;
44 krb5_const_realm realm;
45 krb5_error_code kret;
46
47 memset(&in_cred, 0, sizeof(in_cred));
48 in_cred.client = principal;
49
50 realm = krb5_principal_get_realm(context, principal);
51 if (realm == NULL) {
52 _gsskrb5_clear_status ();
53 *minor_status = KRB5_PRINC_NOMATCH; /* XXX */
54 return GSS_S_FAILURE;
55 }
56
57 kret = krb5_make_principal(context, &in_cred.server,
58 realm, KRB5_TGS_NAME, realm, NULL);
59 if (kret) {
60 *minor_status = kret;
61 return GSS_S_FAILURE;
62 }
63
64 kret = krb5_cc_retrieve_cred(context, id, 0, &in_cred, &out_cred);
65 krb5_free_principal(context, in_cred.server);
66 if (kret) {
67 *minor_status = 0;
68 *lifetime = 0;
69 return GSS_S_COMPLETE;
70 }
71
72 *lifetime = out_cred.times.endtime;
73 krb5_free_cred_contents(context, &out_cred);
74
75 return GSS_S_COMPLETE;
76}
77
78
79
80
81static krb5_error_code
82get_keytab(krb5_context context, krb5_keytab *keytab)
83{
84 krb5_error_code kret;
85
86 HEIMDAL_MUTEX_lock(&gssapi_keytab_mutex);
87
88 if (_gsskrb5_keytab != NULL) {
89 char *name = NULL;
90
91 kret = krb5_kt_get_full_name(context, _gsskrb5_keytab, &name);
92 if (kret == 0) {
93 kret = krb5_kt_resolve(context, name, keytab);
94 krb5_xfree(name);
95 }
96 } else
97 kret = krb5_kt_default(context, keytab);
98
99 HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);
100
101 return (kret);
102}
103
104static OM_uint32 acquire_initiator_cred
105 (OM_uint32 * minor_status,
106 krb5_context context,
107 gss_const_OID credential_type,
108 const void *credential_data,
109 const gss_name_t desired_name,
110 OM_uint32 time_req,
111 gss_const_OID desired_mech,
112 gss_cred_usage_t cred_usage,
113 gsskrb5_cred handle
114 )
115{
116 OM_uint32 ret;
117 krb5_creds cred;
118 krb5_principal def_princ;
119 krb5_get_init_creds_opt *opt;
120 krb5_ccache ccache;
121 krb5_keytab keytab;
122 krb5_error_code kret;
123
124 keytab = NULL;
125 ccache = NULL;
126 def_princ = NULL;
127 ret = GSS_S_FAILURE;
128 memset(&cred, 0, sizeof(cred));
129
130 /*
131 * If we have a preferred principal, lets try to find it in all
132 * caches, otherwise, fall back to default cache, ignore all
133 * errors while searching.
134 */
135
136 if (credential_type != GSS_C_NO_OID &&
137 !gss_oid_equal(credential_type, GSS_C_CRED_PASSWORD)) {
138 kret = KRB5_NOCREDS_SUPPLIED; /* XXX */
139 goto end;
140 }
141
142 if (handle->principal) {
143 kret = krb5_cc_cache_match (context,
144 handle->principal,
145 &ccache);
146 if (kret == 0) {
147 ret = GSS_S_COMPLETE;
148 goto found;
149 }
150 }
151
152 if (ccache == NULL) {
153 kret = krb5_cc_default(context, &ccache);
154 if (kret)
155 goto end;
156 }
157 kret = krb5_cc_get_principal(context, ccache, &def_princ);
158 if (kret != 0) {
159 /* we'll try to use a keytab below */
160 krb5_cc_close(context, ccache);
161 def_princ = NULL;
162 kret = 0;
163 } else if (handle->principal == NULL) {
164 kret = krb5_copy_principal(context, def_princ, &handle->principal);
165 if (kret)
166 goto end;
167 } else if (handle->principal != NULL &&
168 krb5_principal_compare(context, handle->principal,
169 def_princ) == FALSE) {
170 krb5_free_principal(context, def_princ);
171 def_princ = NULL;
172 krb5_cc_close(context, ccache);
173 ccache = NULL;
174 }
175 if (def_princ == NULL) {
176 /* We have no existing credentials cache,
177 * so attempt to get a TGT using a keytab.
178 */
179 if (handle->principal == NULL) {
180 kret = krb5_get_default_principal(context, &handle->principal);
181 if (kret)
182 goto end;
183 }
184 kret = krb5_get_init_creds_opt_alloc(context, &opt);
185 if (kret)
186 goto end;
187 if (credential_type != GSS_C_NO_OID &&
188 gss_oid_equal(credential_type, GSS_C_CRED_PASSWORD)) {
189 gss_buffer_t password = (gss_buffer_t)credential_data;
190
191 /* XXX are we requiring password to be NUL terminated? */
192
193 kret = krb5_get_init_creds_password(context, &cred,
194 handle->principal,
195 password->value,
196 NULL, NULL, 0, NULL, opt);
197 } else {
198 kret = get_keytab(context, &keytab);
199 if (kret) {
200 krb5_get_init_creds_opt_free(context, opt);
201 goto end;
202 }
203 kret = krb5_get_init_creds_keytab(context, &cred,
204 handle->principal, keytab,
205 0, NULL, opt);
206 }
207 krb5_get_init_creds_opt_free(context, opt);
208 if (kret)
209 goto end;
210 kret = krb5_cc_new_unique(context, krb5_cc_type_memory,
211 NULL, &ccache);
212 if (kret)
213 goto end;
214 kret = krb5_cc_initialize(context, ccache, cred.client);
215 if (kret) {
216 krb5_cc_destroy(context, ccache);
217 goto end;
218 }
219 kret = krb5_cc_store_cred(context, ccache, &cred);
220 if (kret) {
221 krb5_cc_destroy(context, ccache);
222 goto end;
223 }
224 handle->lifetime = cred.times.endtime;
225 handle->cred_flags |= GSS_CF_DESTROY_CRED_ON_RELEASE;
226 } else {
227
228 ret = __gsskrb5_ccache_lifetime(minor_status,
229 context,
230 ccache,
231 handle->principal,
232 &handle->lifetime);
233 if (ret != GSS_S_COMPLETE) {
234 krb5_cc_close(context, ccache);
235 goto end;
236 }
237 kret = 0;
238 }
239 found:
240 handle->ccache = ccache;
241 ret = GSS_S_COMPLETE;
242
243end:
244 if (cred.client != NULL)
245 krb5_free_cred_contents(context, &cred);
246 if (def_princ != NULL)
247 krb5_free_principal(context, def_princ);
248 if (keytab != NULL)
249 krb5_kt_close(context, keytab);
250 if (ret != GSS_S_COMPLETE && kret != 0)
251 *minor_status = kret;
252 return (ret);
253}
254
255static OM_uint32 acquire_acceptor_cred
256 (OM_uint32 * minor_status,
257 krb5_context context,
258 gss_const_OID credential_type,
259 const void *credential_data,
260 const gss_name_t desired_name,
261 OM_uint32 time_req,
262 gss_const_OID desired_mech,
263 gss_cred_usage_t cred_usage,
264 gsskrb5_cred handle
265 )
266{
267 OM_uint32 ret;
268 krb5_error_code kret;
269
270 ret = GSS_S_FAILURE;
271
272 if (credential_type != GSS_C_NO_OID) {
273 kret = EINVAL;
274 goto end;
275 }
276
277 kret = get_keytab(context, &handle->keytab);
278 if (kret)
279 goto end;
280
281 /* check that the requested principal exists in the keytab */
282 if (handle->principal) {
283 krb5_keytab_entry entry;
284
285 kret = krb5_kt_get_entry(context, handle->keytab,
286 handle->principal, 0, 0, &entry);
287 if (kret)
288 goto end;
289 krb5_kt_free_entry(context, &entry);
290 ret = GSS_S_COMPLETE;
291 } else {
292 /*
293 * Check if there is at least one entry in the keytab before
294 * declaring it as an useful keytab.
295 */
296 krb5_keytab_entry tmp;
297 krb5_kt_cursor c;
298
299 kret = krb5_kt_start_seq_get (context, handle->keytab, &c);
300 if (kret)
301 goto end;
302 if (krb5_kt_next_entry(context, handle->keytab, &tmp, &c) == 0) {
303 krb5_kt_free_entry(context, &tmp);
304 ret = GSS_S_COMPLETE; /* ok found one entry */
305 }
306 krb5_kt_end_seq_get (context, handle->keytab, &c);
307 }
308end:
309 if (ret != GSS_S_COMPLETE) {
310 if (handle->keytab != NULL)
311 krb5_kt_close(context, handle->keytab);
312 if (kret != 0) {
313 *minor_status = kret;
314 }
315 }
316 return (ret);
317}
318
319OM_uint32 GSSAPI_CALLCONV _gsskrb5_acquire_cred
320(OM_uint32 * minor_status,
321 const gss_name_t desired_name,
322 OM_uint32 time_req,
323 const gss_OID_set desired_mechs,
324 gss_cred_usage_t cred_usage,
325 gss_cred_id_t * output_cred_handle,
326 gss_OID_set * actual_mechs,
327 OM_uint32 * time_rec
328 )
329{
330 OM_uint32 ret;
331
332 if (desired_mechs) {
333 int present = 0;
334
335 ret = gss_test_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
336 desired_mechs, &present);
337 if (ret)
338 return ret;
339 if (!present) {
340 *minor_status = 0;
341 return GSS_S_BAD_MECH;
342 }
343 }
344
345 ret = _gsskrb5_acquire_cred_ext(minor_status,
346 desired_name,
347 GSS_C_NO_OID,
348 NULL,
349 time_req,
350 GSS_KRB5_MECHANISM,
351 cred_usage,
352 output_cred_handle);
353 if (ret)
354 return ret;
355
356
357 ret = _gsskrb5_inquire_cred(minor_status, *output_cred_handle,
358 NULL, time_rec, NULL, actual_mechs);
359 if (ret) {
360 OM_uint32 tmp;
361 _gsskrb5_release_cred(&tmp, output_cred_handle);
362 }
363
364 return ret;
365}
366
367OM_uint32 GSSAPI_CALLCONV _gsskrb5_acquire_cred_ext
368(OM_uint32 * minor_status,
369 const gss_name_t desired_name,
370 gss_const_OID credential_type,
371 const void *credential_data,
372 OM_uint32 time_req,
373 gss_const_OID desired_mech,
374 gss_cred_usage_t cred_usage,
375 gss_cred_id_t * output_cred_handle
376 )
377{
378 krb5_context context;
379 gsskrb5_cred handle;
380 OM_uint32 ret;
381
382 cred_usage &= GSS_C_OPTION_MASK;
383
384 if (cred_usage != GSS_C_ACCEPT && cred_usage != GSS_C_INITIATE && cred_usage != GSS_C_BOTH) {
385 *minor_status = GSS_KRB5_S_G_BAD_USAGE;
386 return GSS_S_FAILURE;
387 }
388
389 GSSAPI_KRB5_INIT(&context);
390
391 *output_cred_handle = NULL;
392
393 handle = calloc(1, sizeof(*handle));
394 if (handle == NULL) {
395 *minor_status = ENOMEM;
396 return (GSS_S_FAILURE);
397 }
398
399 HEIMDAL_MUTEX_init(&handle->cred_id_mutex);
400
401 if (desired_name != GSS_C_NO_NAME) {
402 ret = _gsskrb5_canon_name(minor_status, context, 1, NULL,
403 desired_name, &handle->principal);
404 if (ret) {
405 HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
406 free(handle);
407 return ret;
408 }
409 }
410 if (cred_usage == GSS_C_INITIATE || cred_usage == GSS_C_BOTH) {
411 ret = acquire_initiator_cred(minor_status, context,
412 credential_type, credential_data,
413 desired_name, time_req,
414 desired_mech, cred_usage, handle);
415 if (ret != GSS_S_COMPLETE) {
416 HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
417 krb5_free_principal(context, handle->principal);
418 free(handle);
419 return (ret);
420 }
421 }
422 if (cred_usage == GSS_C_ACCEPT || cred_usage == GSS_C_BOTH) {
423 ret = acquire_acceptor_cred(minor_status, context,
424 credential_type, credential_data,
425 desired_name, time_req,
426 desired_mech, cred_usage, handle);
427 if (ret != GSS_S_COMPLETE) {
428 HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
429 krb5_free_principal(context, handle->principal);
430 free(handle);
431 return (ret);
432 }
433 }
434 ret = gss_create_empty_oid_set(minor_status, &handle->mechanisms);
435 if (ret == GSS_S_COMPLETE)
436 ret = gss_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
437 &handle->mechanisms);
438 if (ret != GSS_S_COMPLETE) {
439 if (handle->mechanisms != NULL)
440 gss_release_oid_set(NULL, &handle->mechanisms);
441 HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
442 krb5_free_principal(context, handle->principal);
443 free(handle);
444 return (ret);
445 }
446 handle->usage = cred_usage;
447 *minor_status = 0;
448 *output_cred_handle = (gss_cred_id_t)handle;
449 return (GSS_S_COMPLETE);
450}
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