source: vendor/current/source4/heimdal/lib/krb5/get_in_tkt.c@ 740

Last change on this file since 740 was 740, checked in by Silvan Scherrer, 12 years ago

Samba Server: update vendor to 3.6.0
File size: 14.9 KB
Line 
1/*
2 * Copyright (c) 1997 - 2008 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#define KRB5_DEPRECATED
35
36#include "krb5_locl.h"
37
38#ifndef HEIMDAL_SMALLER
39
40static krb5_error_code
41make_pa_enc_timestamp(krb5_context context, PA_DATA *pa,
42 krb5_enctype etype, krb5_keyblock *key)
43{
44 PA_ENC_TS_ENC p;
45 unsigned char *buf;
46 size_t buf_size;
47 size_t len;
48 EncryptedData encdata;
49 krb5_error_code ret;
50 int32_t usec;
51 int usec2;
52 krb5_crypto crypto;
53
54 krb5_us_timeofday (context, &p.patimestamp, &usec);
55 usec2 = usec;
56 p.pausec = &usec2;
57
58 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
59 if (ret)
60 return ret;
61 if(buf_size != len)
62 krb5_abortx(context, "internal error in ASN.1 encoder");
63 ret = krb5_crypto_init(context, key, 0, &crypto);
64 if (ret) {
65 free(buf);
66 return ret;
67 }
68 ret = krb5_encrypt_EncryptedData(context,
69 crypto,
70 KRB5_KU_PA_ENC_TIMESTAMP,
71 buf,
72 len,
73 0,
74 &encdata);
75 free(buf);
76 krb5_crypto_destroy(context, crypto);
77 if (ret)
78 return ret;
79
80 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
81 free_EncryptedData(&encdata);
82 if (ret)
83 return ret;
84 if(buf_size != len)
85 krb5_abortx(context, "internal error in ASN.1 encoder");
86 pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
87 pa->padata_value.length = len;
88 pa->padata_value.data = buf;
89 return 0;
90}
91
92static krb5_error_code
93add_padata(krb5_context context,
94 METHOD_DATA *md,
95 krb5_principal client,
96 krb5_key_proc key_proc,
97 krb5_const_pointer keyseed,
98 krb5_enctype *enctypes,
99 unsigned netypes,
100 krb5_salt *salt)
101{
102 krb5_error_code ret;
103 PA_DATA *pa2;
104 krb5_salt salt2;
105 krb5_enctype *ep;
106 int i;
107
108 if(salt == NULL) {
109 /* default to standard salt */
110 ret = krb5_get_pw_salt (context, client, &salt2);
111 if (ret)
112 return ret;
113 salt = &salt2;
114 }
115 if (!enctypes) {
116 enctypes = context->etypes;
117 netypes = 0;
118 for (ep = enctypes; *ep != ETYPE_NULL; ep++)
119 netypes++;
120 }
121 pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
122 if (pa2 == NULL) {
123 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
124 return ENOMEM;
125 }
126 md->val = pa2;
127
128 for (i = 0; i < netypes; ++i) {
129 krb5_keyblock *key;
130
131 ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
132 if (ret)
133 continue;
134 ret = make_pa_enc_timestamp (context, &md->val[md->len],
135 enctypes[i], key);
136 krb5_free_keyblock (context, key);
137 if (ret)
138 return ret;
139 ++md->len;
140 }
141 if(salt == &salt2)
142 krb5_free_salt(context, salt2);
143 return 0;
144}
145
146static krb5_error_code
147init_as_req (krb5_context context,
148 KDCOptions opts,
149 krb5_creds *creds,
150 const krb5_addresses *addrs,
151 const krb5_enctype *etypes,
152 const krb5_preauthtype *ptypes,
153 const krb5_preauthdata *preauth,
154 krb5_key_proc key_proc,
155 krb5_const_pointer keyseed,
156 unsigned nonce,
157 AS_REQ *a)
158{
159 krb5_error_code ret;
160 krb5_salt salt;
161
162 memset(a, 0, sizeof(*a));
163
164 a->pvno = 5;
165 a->msg_type = krb_as_req;
166 a->req_body.kdc_options = opts;
167 a->req_body.cname = malloc(sizeof(*a->req_body.cname));
168 if (a->req_body.cname == NULL) {
169 ret = ENOMEM;
170 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
171 goto fail;
172 }
173 a->req_body.sname = malloc(sizeof(*a->req_body.sname));
174 if (a->req_body.sname == NULL) {
175 ret = ENOMEM;
176 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
177 goto fail;
178 }
179 ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
180 if (ret)
181 goto fail;
182 ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
183 if (ret)
184 goto fail;
185 ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
186 if (ret)
187 goto fail;
188
189 if(creds->times.starttime) {
190 a->req_body.from = malloc(sizeof(*a->req_body.from));
191 if (a->req_body.from == NULL) {
192 ret = ENOMEM;
193 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
194 goto fail;
195 }
196 *a->req_body.from = creds->times.starttime;
197 }
198 if(creds->times.endtime){
199 ALLOC(a->req_body.till, 1);
200 *a->req_body.till = creds->times.endtime;
201 }
202 if(creds->times.renew_till){
203 a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
204 if (a->req_body.rtime == NULL) {
205 ret = ENOMEM;
206 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
207 goto fail;
208 }
209 *a->req_body.rtime = creds->times.renew_till;
210 }
211 a->req_body.nonce = nonce;
212 ret = krb5_init_etype (context,
213 &a->req_body.etype.len,
214 &a->req_body.etype.val,
215 etypes);
216 if (ret)
217 goto fail;
218
219 /*
220 * This means no addresses
221 */
222
223 if (addrs && addrs->len == 0) {
224 a->req_body.addresses = NULL;
225 } else {
226 a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
227 if (a->req_body.addresses == NULL) {
228 ret = ENOMEM;
229 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
230 goto fail;
231 }
232
233 if (addrs)
234 ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
235 else {
236 ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
237 if(ret == 0 && a->req_body.addresses->len == 0) {
238 free(a->req_body.addresses);
239 a->req_body.addresses = NULL;
240 }
241 }
242 if (ret)
243 return ret;
244 }
245
246 a->req_body.enc_authorization_data = NULL;
247 a->req_body.additional_tickets = NULL;
248
249 if(preauth != NULL) {
250 int i;
251 ALLOC(a->padata, 1);
252 if(a->padata == NULL) {
253 ret = ENOMEM;
254 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
255 goto fail;
256 }
257 a->padata->val = NULL;
258 a->padata->len = 0;
259 for(i = 0; i < preauth->len; i++) {
260 if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
261 int j;
262
263 for(j = 0; j < preauth->val[i].info.len; j++) {
264 krb5_salt *sp = &salt;
265 if(preauth->val[i].info.val[j].salttype)
266 salt.salttype = *preauth->val[i].info.val[j].salttype;
267 else
268 salt.salttype = KRB5_PW_SALT;
269 if(preauth->val[i].info.val[j].salt)
270 salt.saltvalue = *preauth->val[i].info.val[j].salt;
271 else
272 if(salt.salttype == KRB5_PW_SALT)
273 sp = NULL;
274 else
275 krb5_data_zero(&salt.saltvalue);
276 ret = add_padata(context, a->padata, creds->client,
277 key_proc, keyseed,
278 &preauth->val[i].info.val[j].etype, 1,
279 sp);
280 if (ret == 0)
281 break;
282 }
283 }
284 }
285 } else
286 /* not sure this is the way to use `ptypes' */
287 if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
288 a->padata = NULL;
289 else if (*ptypes == KRB5_PADATA_ENC_TIMESTAMP) {
290 ALLOC(a->padata, 1);
291 if (a->padata == NULL) {
292 ret = ENOMEM;
293 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
294 goto fail;
295 }
296 a->padata->len = 0;
297 a->padata->val = NULL;
298
299 /* make a v5 salted pa-data */
300 add_padata(context, a->padata, creds->client,
301 key_proc, keyseed, a->req_body.etype.val,
302 a->req_body.etype.len, NULL);
303
304 /* make a v4 salted pa-data */
305 salt.salttype = KRB5_PW_SALT;
306 krb5_data_zero(&salt.saltvalue);
307 add_padata(context, a->padata, creds->client,
308 key_proc, keyseed, a->req_body.etype.val,
309 a->req_body.etype.len, &salt);
310 } else {
311 ret = KRB5_PREAUTH_BAD_TYPE;
312 krb5_set_error_message (context, ret,
313 N_("pre-auth type %d not supported", ""),
314 *ptypes);
315 goto fail;
316 }
317 return 0;
318fail:
319 free_AS_REQ(a);
320 return ret;
321}
322
323static int
324set_ptypes(krb5_context context,
325 KRB_ERROR *error,
326 const krb5_preauthtype **ptypes,
327 krb5_preauthdata **preauth)
328{
329 static krb5_preauthdata preauth2;
330 static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };
331
332 if(error->e_data) {
333 METHOD_DATA md;
334 int i;
335 decode_METHOD_DATA(error->e_data->data,
336 error->e_data->length,
337 &md,
338 NULL);
339 for(i = 0; i < md.len; i++){
340 switch(md.val[i].padata_type){
341 case KRB5_PADATA_ENC_TIMESTAMP:
342 *ptypes = ptypes2;
343 break;
344 case KRB5_PADATA_ETYPE_INFO:
345 *preauth = &preauth2;
346 ALLOC_SEQ(*preauth, 1);
347 (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
348 decode_ETYPE_INFO(md.val[i].padata_value.data,
349 md.val[i].padata_value.length,
350 &(*preauth)->val[0].info,
351 NULL);
352 break;
353 default:
354 break;
355 }
356 }
357 free_METHOD_DATA(&md);
358 } else {
359 *ptypes = ptypes2;
360 }
361 return(1);
362}
363
364KRB5_DEPRECATED
365KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
366krb5_get_in_cred(krb5_context context,
367 krb5_flags options,
368 const krb5_addresses *addrs,
369 const krb5_enctype *etypes,
370 const krb5_preauthtype *ptypes,
371 const krb5_preauthdata *preauth,
372 krb5_key_proc key_proc,
373 krb5_const_pointer keyseed,
374 krb5_decrypt_proc decrypt_proc,
375 krb5_const_pointer decryptarg,
376 krb5_creds *creds,
377 krb5_kdc_rep *ret_as_reply)
378{
379 krb5_error_code ret;
380 AS_REQ a;
381 krb5_kdc_rep rep;
382 krb5_data req, resp;
383 size_t len;
384 krb5_salt salt;
385 krb5_keyblock *key;
386 size_t size;
387 KDCOptions opts;
388 PA_DATA *pa;
389 krb5_enctype etype;
390 krb5_preauthdata *my_preauth = NULL;
391 unsigned nonce;
392 int done;
393
394 opts = int2KDCOptions(options);
395
396 krb5_generate_random_block (&nonce, sizeof(nonce));
397 nonce &= 0xffffffff;
398
399 do {
400 done = 1;
401 ret = init_as_req (context,
402 opts,
403 creds,
404 addrs,
405 etypes,
406 ptypes,
407 preauth,
408 key_proc,
409 keyseed,
410 nonce,
411 &a);
412 if (my_preauth) {
413 free_ETYPE_INFO(&my_preauth->val[0].info);
414 free (my_preauth->val);
415 my_preauth = NULL;
416 }
417 if (ret)
418 return ret;
419
420 ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
421 free_AS_REQ(&a);
422 if (ret)
423 return ret;
424 if(len != req.length)
425 krb5_abortx(context, "internal error in ASN.1 encoder");
426
427 ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
428 krb5_data_free(&req);
429 if (ret)
430 return ret;
431
432 memset (&rep, 0, sizeof(rep));
433 ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
434 if(ret) {
435 /* let's try to parse it as a KRB-ERROR */
436 KRB_ERROR error;
437 int ret2;
438
439 ret2 = krb5_rd_error(context, &resp, &error);
440 if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
441 ret = KRB5KRB_AP_ERR_V4_REPLY;
442 krb5_data_free(&resp);
443 if (ret2 == 0) {
444 ret = krb5_error_from_rd_error(context, &error, creds);
445 /* if no preauth was set and KDC requires it, give it
446 one more try */
447 if (!ptypes && !preauth
448 && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
449#if 0
450 || ret == KRB5KDC_ERR_BADOPTION
451#endif
452 && set_ptypes(context, &error, &ptypes, &my_preauth)) {
453 done = 0;
454 preauth = my_preauth;
455 krb5_free_error_contents(context, &error);
456 krb5_clear_error_message(context);
457 continue;
458 }
459 if(ret_as_reply)
460 ret_as_reply->error = error;
461 else
462 free_KRB_ERROR (&error);
463 return ret;
464 }
465 return ret;
466 }
467 krb5_data_free(&resp);
468 } while(!done);
469
470 pa = NULL;
471 etype = rep.kdc_rep.enc_part.etype;
472 if(rep.kdc_rep.padata){
473 int i = 0;
474 pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
475 KRB5_PADATA_PW_SALT, &i);
476 if(pa == NULL) {
477 i = 0;
478 pa = krb5_find_padata(rep.kdc_rep.padata->val,
479 rep.kdc_rep.padata->len,
480 KRB5_PADATA_AFS3_SALT, &i);
481 }
482 }
483 if(pa) {
484 salt.salttype = pa->padata_type;
485 salt.saltvalue = pa->padata_value;
486
487 ret = (*key_proc)(context, etype, salt, keyseed, &key);
488 } else {
489 /* make a v5 salted pa-data */
490 ret = krb5_get_pw_salt (context, creds->client, &salt);
491
492 if (ret)
493 goto out;
494 ret = (*key_proc)(context, etype, salt, keyseed, &key);
495 krb5_free_salt(context, salt);
496 }
497 if (ret)
498 goto out;
499
500 {
501 unsigned flags = EXTRACT_TICKET_TIMESYNC;
502 if (opts.request_anonymous)
503 flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
504
505 ret = _krb5_extract_ticket(context,
506 &rep,
507 creds,
508 key,
509 keyseed,
510 KRB5_KU_AS_REP_ENC_PART,
511 NULL,
512 nonce,
513 flags,
514 decrypt_proc,
515 decryptarg);
516 }
517 memset (key->keyvalue.data, 0, key->keyvalue.length);
518 krb5_free_keyblock_contents (context, key);
519 free (key);
520
521out:
522 if (ret == 0 && ret_as_reply)
523 *ret_as_reply = rep;
524 else
525 krb5_free_kdc_rep (context, &rep);
526 return ret;
527}
528
529KRB5_DEPRECATED
530KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
531krb5_get_in_tkt(krb5_context context,
532 krb5_flags options,
533 const krb5_addresses *addrs,
534 const krb5_enctype *etypes,
535 const krb5_preauthtype *ptypes,
536 krb5_key_proc key_proc,
537 krb5_const_pointer keyseed,
538 krb5_decrypt_proc decrypt_proc,
539 krb5_const_pointer decryptarg,
540 krb5_creds *creds,
541 krb5_ccache ccache,
542 krb5_kdc_rep *ret_as_reply)
543{
544 krb5_error_code ret;
545
546 ret = krb5_get_in_cred (context,
547 options,
548 addrs,
549 etypes,
550 ptypes,
551 NULL,
552 key_proc,
553 keyseed,
554 decrypt_proc,
555 decryptarg,
556 creds,
557 ret_as_reply);
558 if(ret)
559 return ret;
560 if (ccache)
561 ret = krb5_cc_store_cred (context, ccache, creds);
562 return ret;
563}
564
565#endif /* HEIMDAL_SMALLER */
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