source: heimdal/trunk/lib/krb5/get_in_tkt.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: 14.5 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#include "krb5_locl.h"
35
36#ifndef HEIMDAL_SMALLER
37
38static krb5_error_code
39make_pa_enc_timestamp(krb5_context context, PA_DATA *pa,
40 krb5_enctype etype, krb5_keyblock *key)
41{
42 PA_ENC_TS_ENC p;
43 unsigned char *buf;
44 size_t buf_size;
45 size_t len = 0;
46 EncryptedData encdata;
47 krb5_error_code ret;
48 int32_t usec;
49 int usec2;
50 krb5_crypto crypto;
51
52 krb5_us_timeofday (context, &p.patimestamp, &usec);
53 usec2 = usec;
54 p.pausec = &usec2;
55
56 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
57 if (ret)
58 return ret;
59 if(buf_size != len)
60 krb5_abortx(context, "internal error in ASN.1 encoder");
61 ret = krb5_crypto_init(context, key, 0, &crypto);
62 if (ret) {
63 free(buf);
64 return ret;
65 }
66 ret = krb5_encrypt_EncryptedData(context,
67 crypto,
68 KRB5_KU_PA_ENC_TIMESTAMP,
69 buf,
70 len,
71 0,
72 &encdata);
73 free(buf);
74 krb5_crypto_destroy(context, crypto);
75 if (ret)
76 return ret;
77
78 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
79 free_EncryptedData(&encdata);
80 if (ret)
81 return ret;
82 if(buf_size != len)
83 krb5_abortx(context, "internal error in ASN.1 encoder");
84 pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
85 pa->padata_value.length = len;
86 pa->padata_value.data = buf;
87 return 0;
88}
89
90static krb5_error_code
91add_padata(krb5_context context,
92 METHOD_DATA *md,
93 krb5_principal client,
94 krb5_key_proc key_proc,
95 krb5_const_pointer keyseed,
96 krb5_enctype *enctypes,
97 unsigned netypes,
98 krb5_salt *salt)
99{
100 krb5_error_code ret;
101 PA_DATA *pa2;
102 krb5_salt salt2;
103 krb5_enctype *ep;
104 size_t i;
105
106 if(salt == NULL) {
107 /* default to standard salt */
108 ret = krb5_get_pw_salt (context, client, &salt2);
109 if (ret)
110 return ret;
111 salt = &salt2;
112 }
113 if (!enctypes) {
114 enctypes = context->etypes;
115 netypes = 0;
116 for (ep = enctypes; *ep != ETYPE_NULL; ep++)
117 netypes++;
118 }
119 pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
120 if (pa2 == NULL) {
121 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
122 return ENOMEM;
123 }
124 md->val = pa2;
125
126 for (i = 0; i < netypes; ++i) {
127 krb5_keyblock *key;
128
129 ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
130 if (ret)
131 continue;
132 ret = make_pa_enc_timestamp (context, &md->val[md->len],
133 enctypes[i], key);
134 krb5_free_keyblock (context, key);
135 if (ret)
136 return ret;
137 ++md->len;
138 }
139 if(salt == &salt2)
140 krb5_free_salt(context, salt2);
141 return 0;
142}
143
144static krb5_error_code
145init_as_req (krb5_context context,
146 KDCOptions opts,
147 krb5_creds *creds,
148 const krb5_addresses *addrs,
149 const krb5_enctype *etypes,
150 const krb5_preauthtype *ptypes,
151 const krb5_preauthdata *preauth,
152 krb5_key_proc key_proc,
153 krb5_const_pointer keyseed,
154 unsigned nonce,
155 AS_REQ *a)
156{
157 krb5_error_code ret;
158 krb5_salt salt;
159
160 memset(a, 0, sizeof(*a));
161
162 a->pvno = 5;
163 a->msg_type = krb_as_req;
164 a->req_body.kdc_options = opts;
165 a->req_body.cname = malloc(sizeof(*a->req_body.cname));
166 if (a->req_body.cname == NULL) {
167 ret = ENOMEM;
168 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
169 goto fail;
170 }
171 a->req_body.sname = malloc(sizeof(*a->req_body.sname));
172 if (a->req_body.sname == NULL) {
173 ret = ENOMEM;
174 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
175 goto fail;
176 }
177 ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
178 if (ret)
179 goto fail;
180 ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
181 if (ret)
182 goto fail;
183 ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
184 if (ret)
185 goto fail;
186
187 if(creds->times.starttime) {
188 a->req_body.from = malloc(sizeof(*a->req_body.from));
189 if (a->req_body.from == NULL) {
190 ret = ENOMEM;
191 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
192 goto fail;
193 }
194 *a->req_body.from = creds->times.starttime;
195 }
196 if(creds->times.endtime){
197 ALLOC(a->req_body.till, 1);
198 *a->req_body.till = creds->times.endtime;
199 }
200 if(creds->times.renew_till){
201 a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
202 if (a->req_body.rtime == NULL) {
203 ret = ENOMEM;
204 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
205 goto fail;
206 }
207 *a->req_body.rtime = creds->times.renew_till;
208 }
209 a->req_body.nonce = nonce;
210 ret = _krb5_init_etype(context,
211 KRB5_PDU_AS_REQUEST,
212 &a->req_body.etype.len,
213 &a->req_body.etype.val,
214 etypes);
215 if (ret)
216 goto fail;
217
218 /*
219 * This means no addresses
220 */
221
222 if (addrs && addrs->len == 0) {
223 a->req_body.addresses = NULL;
224 } else {
225 a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
226 if (a->req_body.addresses == NULL) {
227 ret = ENOMEM;
228 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
229 goto fail;
230 }
231
232 if (addrs)
233 ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
234 else {
235 ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
236 if(ret == 0 && a->req_body.addresses->len == 0) {
237 free(a->req_body.addresses);
238 a->req_body.addresses = NULL;
239 }
240 }
241 if (ret)
242 return ret;
243 }
244
245 a->req_body.enc_authorization_data = NULL;
246 a->req_body.additional_tickets = NULL;
247
248 if(preauth != NULL) {
249 size_t i;
250 ALLOC(a->padata, 1);
251 if(a->padata == NULL) {
252 ret = ENOMEM;
253 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
254 goto fail;
255 }
256 a->padata->val = NULL;
257 a->padata->len = 0;
258 for(i = 0; i < preauth->len; i++) {
259 if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
260 size_t j;
261
262 for(j = 0; j < preauth->val[i].info.len; j++) {
263 krb5_salt *sp = &salt;
264 if(preauth->val[i].info.val[j].salttype)
265 salt.salttype = *preauth->val[i].info.val[j].salttype;
266 else
267 salt.salttype = KRB5_PW_SALT;
268 if(preauth->val[i].info.val[j].salt)
269 salt.saltvalue = *preauth->val[i].info.val[j].salt;
270 else
271 if(salt.salttype == KRB5_PW_SALT)
272 sp = NULL;
273 else
274 krb5_data_zero(&salt.saltvalue);
275 ret = add_padata(context, a->padata, creds->client,
276 key_proc, keyseed,
277 &preauth->val[i].info.val[j].etype, 1,
278 sp);
279 if (ret == 0)
280 break;
281 }
282 }
283 }
284 } else
285 /* not sure this is the way to use `ptypes' */
286 if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
287 a->padata = NULL;
288 else if (*ptypes == KRB5_PADATA_ENC_TIMESTAMP) {
289 ALLOC(a->padata, 1);
290 if (a->padata == NULL) {
291 ret = ENOMEM;
292 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
293 goto fail;
294 }
295 a->padata->len = 0;
296 a->padata->val = NULL;
297
298 /* make a v5 salted pa-data */
299 add_padata(context, a->padata, creds->client,
300 key_proc, keyseed, a->req_body.etype.val,
301 a->req_body.etype.len, NULL);
302
303 /* make a v4 salted pa-data */
304 salt.salttype = KRB5_PW_SALT;
305 krb5_data_zero(&salt.saltvalue);
306 add_padata(context, a->padata, creds->client,
307 key_proc, keyseed, a->req_body.etype.val,
308 a->req_body.etype.len, &salt);
309 } else {
310 ret = KRB5_PREAUTH_BAD_TYPE;
311 krb5_set_error_message (context, ret,
312 N_("pre-auth type %d not supported", ""),
313 *ptypes);
314 goto fail;
315 }
316 return 0;
317fail:
318 free_AS_REQ(a);
319 return ret;
320}
321
322static int
323set_ptypes(krb5_context context,
324 KRB_ERROR *error,
325 const krb5_preauthtype **ptypes,
326 krb5_preauthdata **preauth)
327{
328 static krb5_preauthdata preauth2;
329 static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };
330
331 if(error->e_data) {
332 METHOD_DATA md;
333 size_t i;
334 decode_METHOD_DATA(error->e_data->data,
335 error->e_data->length,
336 &md,
337 NULL);
338 for(i = 0; i < md.len; i++){
339 switch(md.val[i].padata_type){
340 case KRB5_PADATA_ENC_TIMESTAMP:
341 *ptypes = ptypes2;
342 break;
343 case KRB5_PADATA_ETYPE_INFO:
344 *preauth = &preauth2;
345 ALLOC_SEQ(*preauth, 1);
346 (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
347 decode_ETYPE_INFO(md.val[i].padata_value.data,
348 md.val[i].padata_value.length,
349 &(*preauth)->val[0].info,
350 NULL);
351 break;
352 default:
353 break;
354 }
355 }
356 free_METHOD_DATA(&md);
357 } else {
358 *ptypes = ptypes2;
359 }
360 return(1);
361}
362
363KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
364krb5_get_in_cred(krb5_context context,
365 krb5_flags options,
366 const krb5_addresses *addrs,
367 const krb5_enctype *etypes,
368 const krb5_preauthtype *ptypes,
369 const krb5_preauthdata *preauth,
370 krb5_key_proc key_proc,
371 krb5_const_pointer keyseed,
372 krb5_decrypt_proc decrypt_proc,
373 krb5_const_pointer decryptarg,
374 krb5_creds *creds,
375 krb5_kdc_rep *ret_as_reply)
376 KRB5_DEPRECATED_FUNCTION("Use X instead")
377{
378 krb5_error_code ret;
379 AS_REQ a;
380 krb5_kdc_rep rep;
381 krb5_data req, resp;
382 size_t len = 0;
383 krb5_salt salt;
384 krb5_keyblock *key;
385 size_t size;
386 KDCOptions opts;
387 PA_DATA *pa;
388 krb5_enctype etype;
389 krb5_preauthdata *my_preauth = NULL;
390 unsigned nonce;
391 int done;
392
393 opts = int2KDCOptions(options);
394
395 krb5_generate_random_block (&nonce, sizeof(nonce));
396 nonce &= 0xffffffff;
397
398 do {
399 done = 1;
400 ret = init_as_req (context,
401 opts,
402 creds,
403 addrs,
404 etypes,
405 ptypes,
406 preauth,
407 key_proc,
408 keyseed,
409 nonce,
410 &a);
411 if (my_preauth) {
412 free_ETYPE_INFO(&my_preauth->val[0].info);
413 free (my_preauth->val);
414 my_preauth = NULL;
415 }
416 if (ret)
417 return ret;
418
419 ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
420 free_AS_REQ(&a);
421 if (ret)
422 return ret;
423 if(len != req.length)
424 krb5_abortx(context, "internal error in ASN.1 encoder");
425
426 ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
427 krb5_data_free(&req);
428 if (ret)
429 return ret;
430
431 memset (&rep, 0, sizeof(rep));
432 ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
433 if(ret) {
434 /* let's try to parse it as a KRB-ERROR */
435 KRB_ERROR error;
436 int ret2;
437
438 ret2 = krb5_rd_error(context, &resp, &error);
439 if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
440 ret = KRB5KRB_AP_ERR_V4_REPLY;
441 krb5_data_free(&resp);
442 if (ret2 == 0) {
443 ret = krb5_error_from_rd_error(context, &error, creds);
444 /* if no preauth was set and KDC requires it, give it
445 one more try */
446 if (!ptypes && !preauth
447 && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
448#if 0
449 || ret == KRB5KDC_ERR_BADOPTION
450#endif
451 && set_ptypes(context, &error, &ptypes, &my_preauth)) {
452 done = 0;
453 preauth = my_preauth;
454 krb5_free_error_contents(context, &error);
455 krb5_clear_error_message(context);
456 continue;
457 }
458 if(ret_as_reply)
459 ret_as_reply->error = error;
460 else
461 free_KRB_ERROR (&error);
462 return ret;
463 }
464 return ret;
465 }
466 krb5_data_free(&resp);
467 } while(!done);
468
469 pa = NULL;
470 etype = rep.kdc_rep.enc_part.etype;
471 if(rep.kdc_rep.padata){
472 int i = 0;
473 pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
474 KRB5_PADATA_PW_SALT, &i);
475 if(pa == NULL) {
476 i = 0;
477 pa = krb5_find_padata(rep.kdc_rep.padata->val,
478 rep.kdc_rep.padata->len,
479 KRB5_PADATA_AFS3_SALT, &i);
480 }
481 }
482 if(pa) {
483 salt.salttype = (krb5_salttype)pa->padata_type;
484 salt.saltvalue = pa->padata_value;
485
486 ret = (*key_proc)(context, etype, salt, keyseed, &key);
487 } else {
488 /* make a v5 salted pa-data */
489 ret = krb5_get_pw_salt (context, creds->client, &salt);
490
491 if (ret)
492 goto out;
493 ret = (*key_proc)(context, etype, salt, keyseed, &key);
494 krb5_free_salt(context, salt);
495 }
496 if (ret)
497 goto out;
498
499 {
500 unsigned flags = EXTRACT_TICKET_TIMESYNC;
501 if (opts.request_anonymous)
502 flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
503
504 ret = _krb5_extract_ticket(context,
505 &rep,
506 creds,
507 key,
508 keyseed,
509 KRB5_KU_AS_REP_ENC_PART,
510 NULL,
511 nonce,
512 flags,
513 decrypt_proc,
514 decryptarg);
515 }
516 memset (key->keyvalue.data, 0, key->keyvalue.length);
517 krb5_free_keyblock_contents (context, key);
518 free (key);
519
520out:
521 if (ret == 0 && ret_as_reply)
522 *ret_as_reply = rep;
523 else
524 krb5_free_kdc_rep (context, &rep);
525 return ret;
526}
527
528KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
529krb5_get_in_tkt(krb5_context context,
530 krb5_flags options,
531 const krb5_addresses *addrs,
532 const krb5_enctype *etypes,
533 const krb5_preauthtype *ptypes,
534 krb5_key_proc key_proc,
535 krb5_const_pointer keyseed,
536 krb5_decrypt_proc decrypt_proc,
537 krb5_const_pointer decryptarg,
538 krb5_creds *creds,
539 krb5_ccache ccache,
540 krb5_kdc_rep *ret_as_reply)
541 KRB5_DEPRECATED_FUNCTION("Use X instead")
542{
543 krb5_error_code ret;
544
545 ret = krb5_get_in_cred (context,
546 options,
547 addrs,
548 etypes,
549 ptypes,
550 NULL,
551 key_proc,
552 keyseed,
553 decrypt_proc,
554 decryptarg,
555 creds,
556 ret_as_reply);
557 if(ret)
558 return ret;
559 if (ccache)
560 ret = krb5_cc_store_cred (context, ccache, creds);
561 return ret;
562}
563
564#endif /* HEIMDAL_SMALLER */
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