1 /* $NetBSD: get_in_tkt.c,v 1.1.1.2 2014/04/24 12:45:50 pettai Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #define KRB5_DEPRECATED_FUNCTION(x)
37
38 #include "krb5_locl.h"
39
40 #ifndef HEIMDAL_SMALLER
41
42 static krb5_error_code
make_pa_enc_timestamp(krb5_context context,PA_DATA * pa,krb5_enctype etype,krb5_keyblock * key)43 make_pa_enc_timestamp(krb5_context context, PA_DATA *pa,
44 krb5_enctype etype, krb5_keyblock *key)
45 {
46 PA_ENC_TS_ENC p;
47 unsigned char *buf;
48 size_t buf_size;
49 size_t len = 0;
50 EncryptedData encdata;
51 krb5_error_code ret;
52 int32_t usec;
53 int usec2;
54 krb5_crypto crypto;
55
56 krb5_us_timeofday (context, &p.patimestamp, &usec);
57 usec2 = usec;
58 p.pausec = &usec2;
59
60 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
61 if (ret)
62 return ret;
63 if(buf_size != len)
64 krb5_abortx(context, "internal error in ASN.1 encoder");
65 ret = krb5_crypto_init(context, key, 0, &crypto);
66 if (ret) {
67 free(buf);
68 return ret;
69 }
70 ret = krb5_encrypt_EncryptedData(context,
71 crypto,
72 KRB5_KU_PA_ENC_TIMESTAMP,
73 buf,
74 len,
75 0,
76 &encdata);
77 free(buf);
78 krb5_crypto_destroy(context, crypto);
79 if (ret)
80 return ret;
81
82 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
83 free_EncryptedData(&encdata);
84 if (ret)
85 return ret;
86 if(buf_size != len)
87 krb5_abortx(context, "internal error in ASN.1 encoder");
88 pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
89 pa->padata_value.length = len;
90 pa->padata_value.data = buf;
91 return 0;
92 }
93
94 static krb5_error_code
add_padata(krb5_context context,METHOD_DATA * md,krb5_principal client,krb5_key_proc key_proc,krb5_const_pointer keyseed,krb5_enctype * enctypes,unsigned netypes,krb5_salt * salt)95 add_padata(krb5_context context,
96 METHOD_DATA *md,
97 krb5_principal client,
98 krb5_key_proc key_proc,
99 krb5_const_pointer keyseed,
100 krb5_enctype *enctypes,
101 unsigned netypes,
102 krb5_salt *salt)
103 {
104 krb5_error_code ret;
105 PA_DATA *pa2;
106 krb5_salt salt2;
107 krb5_enctype *ep;
108 size_t i;
109
110 if(salt == NULL) {
111 /* default to standard salt */
112 ret = krb5_get_pw_salt (context, client, &salt2);
113 if (ret)
114 return ret;
115 salt = &salt2;
116 }
117 if (!enctypes) {
118 enctypes = context->etypes;
119 netypes = 0;
120 for (ep = enctypes; *ep != ETYPE_NULL; ep++)
121 netypes++;
122 }
123 pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
124 if (pa2 == NULL) {
125 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
126 return ENOMEM;
127 }
128 md->val = pa2;
129
130 for (i = 0; i < netypes; ++i) {
131 krb5_keyblock *key;
132
133 ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
134 if (ret)
135 continue;
136 ret = make_pa_enc_timestamp (context, &md->val[md->len],
137 enctypes[i], key);
138 krb5_free_keyblock (context, key);
139 if (ret)
140 return ret;
141 ++md->len;
142 }
143 if(salt == &salt2)
144 krb5_free_salt(context, salt2);
145 return 0;
146 }
147
148 static krb5_error_code
init_as_req(krb5_context context,KDCOptions opts,krb5_creds * creds,const krb5_addresses * addrs,const krb5_enctype * etypes,const krb5_preauthtype * ptypes,const krb5_preauthdata * preauth,krb5_key_proc key_proc,krb5_const_pointer keyseed,unsigned nonce,AS_REQ * a)149 init_as_req (krb5_context context,
150 KDCOptions opts,
151 krb5_creds *creds,
152 const krb5_addresses *addrs,
153 const krb5_enctype *etypes,
154 const krb5_preauthtype *ptypes,
155 const krb5_preauthdata *preauth,
156 krb5_key_proc key_proc,
157 krb5_const_pointer keyseed,
158 unsigned nonce,
159 AS_REQ *a)
160 {
161 krb5_error_code ret;
162 krb5_salt salt;
163
164 memset(a, 0, sizeof(*a));
165
166 a->pvno = 5;
167 a->msg_type = krb_as_req;
168 a->req_body.kdc_options = opts;
169 a->req_body.cname = malloc(sizeof(*a->req_body.cname));
170 if (a->req_body.cname == NULL) {
171 ret = ENOMEM;
172 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
173 goto fail;
174 }
175 a->req_body.sname = malloc(sizeof(*a->req_body.sname));
176 if (a->req_body.sname == NULL) {
177 ret = ENOMEM;
178 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
179 goto fail;
180 }
181 ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
182 if (ret)
183 goto fail;
184 ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
185 if (ret)
186 goto fail;
187 ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
188 if (ret)
189 goto fail;
190
191 if(creds->times.starttime) {
192 a->req_body.from = malloc(sizeof(*a->req_body.from));
193 if (a->req_body.from == NULL) {
194 ret = ENOMEM;
195 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
196 goto fail;
197 }
198 *a->req_body.from = creds->times.starttime;
199 }
200 if(creds->times.endtime){
201 ALLOC(a->req_body.till, 1);
202 *a->req_body.till = creds->times.endtime;
203 }
204 if(creds->times.renew_till){
205 a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
206 if (a->req_body.rtime == NULL) {
207 ret = ENOMEM;
208 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
209 goto fail;
210 }
211 *a->req_body.rtime = creds->times.renew_till;
212 }
213 a->req_body.nonce = nonce;
214 ret = _krb5_init_etype(context,
215 KRB5_PDU_AS_REQUEST,
216 &a->req_body.etype.len,
217 &a->req_body.etype.val,
218 etypes);
219 if (ret)
220 goto fail;
221
222 /*
223 * This means no addresses
224 */
225
226 if (addrs && addrs->len == 0) {
227 a->req_body.addresses = NULL;
228 } else {
229 a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
230 if (a->req_body.addresses == NULL) {
231 ret = ENOMEM;
232 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
233 goto fail;
234 }
235
236 if (addrs)
237 ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
238 else {
239 ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
240 if(ret == 0 && a->req_body.addresses->len == 0) {
241 free(a->req_body.addresses);
242 a->req_body.addresses = NULL;
243 }
244 }
245 if (ret)
246 return ret;
247 }
248
249 a->req_body.enc_authorization_data = NULL;
250 a->req_body.additional_tickets = NULL;
251
252 if(preauth != NULL) {
253 size_t i;
254 ALLOC(a->padata, 1);
255 if(a->padata == NULL) {
256 ret = ENOMEM;
257 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
258 goto fail;
259 }
260 a->padata->val = NULL;
261 a->padata->len = 0;
262 for(i = 0; i < preauth->len; i++) {
263 if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
264 size_t j;
265
266 for(j = 0; j < preauth->val[i].info.len; j++) {
267 krb5_salt *sp = &salt;
268 if(preauth->val[i].info.val[j].salttype)
269 salt.salttype = *preauth->val[i].info.val[j].salttype;
270 else
271 salt.salttype = KRB5_PW_SALT;
272 if(preauth->val[i].info.val[j].salt)
273 salt.saltvalue = *preauth->val[i].info.val[j].salt;
274 else
275 if(salt.salttype == KRB5_PW_SALT)
276 sp = NULL;
277 else
278 krb5_data_zero(&salt.saltvalue);
279 ret = add_padata(context, a->padata, creds->client,
280 key_proc, keyseed,
281 &preauth->val[i].info.val[j].etype, 1,
282 sp);
283 if (ret == 0)
284 break;
285 }
286 }
287 }
288 } else
289 /* not sure this is the way to use `ptypes' */
290 if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
291 a->padata = NULL;
292 else if (*ptypes == KRB5_PADATA_ENC_TIMESTAMP) {
293 ALLOC(a->padata, 1);
294 if (a->padata == NULL) {
295 ret = ENOMEM;
296 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
297 goto fail;
298 }
299 a->padata->len = 0;
300 a->padata->val = NULL;
301
302 /* make a v5 salted pa-data */
303 add_padata(context, a->padata, creds->client,
304 key_proc, keyseed, a->req_body.etype.val,
305 a->req_body.etype.len, NULL);
306
307 /* make a v4 salted pa-data */
308 salt.salttype = KRB5_PW_SALT;
309 krb5_data_zero(&salt.saltvalue);
310 add_padata(context, a->padata, creds->client,
311 key_proc, keyseed, a->req_body.etype.val,
312 a->req_body.etype.len, &salt);
313 } else {
314 ret = KRB5_PREAUTH_BAD_TYPE;
315 krb5_set_error_message (context, ret,
316 N_("pre-auth type %d not supported", ""),
317 *ptypes);
318 goto fail;
319 }
320 return 0;
321 fail:
322 free_AS_REQ(a);
323 return ret;
324 }
325
326 static int
set_ptypes(krb5_context context,KRB_ERROR * error,const krb5_preauthtype ** ptypes,krb5_preauthdata ** preauth)327 set_ptypes(krb5_context context,
328 KRB_ERROR *error,
329 const krb5_preauthtype **ptypes,
330 krb5_preauthdata **preauth)
331 {
332 static krb5_preauthdata preauth2;
333 static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };
334
335 if(error->e_data) {
336 METHOD_DATA md;
337 size_t i;
338 decode_METHOD_DATA(error->e_data->data,
339 error->e_data->length,
340 &md,
341 NULL);
342 for(i = 0; i < md.len; i++){
343 switch(md.val[i].padata_type){
344 case KRB5_PADATA_ENC_TIMESTAMP:
345 *ptypes = ptypes2;
346 break;
347 case KRB5_PADATA_ETYPE_INFO:
348 *preauth = &preauth2;
349 ALLOC_SEQ(*preauth, 1);
350 (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
351 decode_ETYPE_INFO(md.val[i].padata_value.data,
352 md.val[i].padata_value.length,
353 &(*preauth)->val[0].info,
354 NULL);
355 break;
356 default:
357 break;
358 }
359 }
360 free_METHOD_DATA(&md);
361 } else {
362 *ptypes = ptypes2;
363 }
364 return(1);
365 }
366
367 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_in_cred(krb5_context context,krb5_flags options,const krb5_addresses * addrs,const krb5_enctype * etypes,const krb5_preauthtype * ptypes,const krb5_preauthdata * preauth,krb5_key_proc key_proc,krb5_const_pointer keyseed,krb5_decrypt_proc decrypt_proc,krb5_const_pointer decryptarg,krb5_creds * creds,krb5_kdc_rep * ret_as_reply)368 krb5_get_in_cred(krb5_context context,
369 krb5_flags options,
370 const krb5_addresses *addrs,
371 const krb5_enctype *etypes,
372 const krb5_preauthtype *ptypes,
373 const krb5_preauthdata *preauth,
374 krb5_key_proc key_proc,
375 krb5_const_pointer keyseed,
376 krb5_decrypt_proc decrypt_proc,
377 krb5_const_pointer decryptarg,
378 krb5_creds *creds,
379 krb5_kdc_rep *ret_as_reply)
380 KRB5_DEPRECATED_FUNCTION("Use X instead")
381 {
382 krb5_error_code ret;
383 AS_REQ a;
384 krb5_kdc_rep rep;
385 krb5_data req, resp;
386 size_t len = 0;
387 krb5_salt salt;
388 krb5_keyblock *key;
389 size_t size;
390 KDCOptions opts;
391 PA_DATA *pa;
392 krb5_enctype etype;
393 krb5_preauthdata *my_preauth = NULL;
394 unsigned nonce;
395 int done;
396
397 opts = int2KDCOptions(options);
398
399 krb5_generate_random_block (&nonce, sizeof(nonce));
400 nonce &= 0xffffffff;
401
402 do {
403 done = 1;
404 ret = init_as_req (context,
405 opts,
406 creds,
407 addrs,
408 etypes,
409 ptypes,
410 preauth,
411 key_proc,
412 keyseed,
413 nonce,
414 &a);
415 if (my_preauth) {
416 free_ETYPE_INFO(&my_preauth->val[0].info);
417 free (my_preauth->val);
418 my_preauth = NULL;
419 }
420 if (ret)
421 return ret;
422
423 ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
424 free_AS_REQ(&a);
425 if (ret)
426 return ret;
427 if(len != req.length)
428 krb5_abortx(context, "internal error in ASN.1 encoder");
429
430 ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
431 krb5_data_free(&req);
432 if (ret)
433 return ret;
434
435 memset (&rep, 0, sizeof(rep));
436 ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
437 if(ret) {
438 /* let's try to parse it as a KRB-ERROR */
439 KRB_ERROR error;
440 int ret2;
441
442 ret2 = krb5_rd_error(context, &resp, &error);
443 if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
444 ret = KRB5KRB_AP_ERR_V4_REPLY;
445 krb5_data_free(&resp);
446 if (ret2 == 0) {
447 ret = krb5_error_from_rd_error(context, &error, creds);
448 /* if no preauth was set and KDC requires it, give it
449 one more try */
450 if (!ptypes && !preauth
451 && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
452 #if 0
453 || ret == KRB5KDC_ERR_BADOPTION
454 #endif
455 && set_ptypes(context, &error, &ptypes, &my_preauth)) {
456 done = 0;
457 preauth = my_preauth;
458 krb5_free_error_contents(context, &error);
459 krb5_clear_error_message(context);
460 continue;
461 }
462 if(ret_as_reply)
463 ret_as_reply->error = error;
464 else
465 free_KRB_ERROR (&error);
466 return ret;
467 }
468 return ret;
469 }
470 krb5_data_free(&resp);
471 } while(!done);
472
473 pa = NULL;
474 etype = rep.kdc_rep.enc_part.etype;
475 if(rep.kdc_rep.padata){
476 int i = 0;
477 pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
478 KRB5_PADATA_PW_SALT, &i);
479 if(pa == NULL) {
480 i = 0;
481 pa = krb5_find_padata(rep.kdc_rep.padata->val,
482 rep.kdc_rep.padata->len,
483 KRB5_PADATA_AFS3_SALT, &i);
484 }
485 }
486 if(pa) {
487 salt.salttype = (krb5_salttype)pa->padata_type;
488 salt.saltvalue = pa->padata_value;
489
490 ret = (*key_proc)(context, etype, salt, keyseed, &key);
491 } else {
492 /* make a v5 salted pa-data */
493 ret = krb5_get_pw_salt (context, creds->client, &salt);
494
495 if (ret)
496 goto out;
497 ret = (*key_proc)(context, etype, salt, keyseed, &key);
498 krb5_free_salt(context, salt);
499 }
500 if (ret)
501 goto out;
502
503 {
504 unsigned flags = EXTRACT_TICKET_TIMESYNC;
505 if (opts.request_anonymous)
506 flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
507
508 ret = _krb5_extract_ticket(context,
509 &rep,
510 creds,
511 key,
512 keyseed,
513 KRB5_KU_AS_REP_ENC_PART,
514 NULL,
515 nonce,
516 flags,
517 decrypt_proc,
518 decryptarg);
519 }
520 memset (key->keyvalue.data, 0, key->keyvalue.length);
521 krb5_free_keyblock_contents (context, key);
522 free (key);
523
524 out:
525 if (ret == 0 && ret_as_reply)
526 *ret_as_reply = rep;
527 else
528 krb5_free_kdc_rep (context, &rep);
529 return ret;
530 }
531
532 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_in_tkt(krb5_context context,krb5_flags options,const krb5_addresses * addrs,const krb5_enctype * etypes,const krb5_preauthtype * ptypes,krb5_key_proc key_proc,krb5_const_pointer keyseed,krb5_decrypt_proc decrypt_proc,krb5_const_pointer decryptarg,krb5_creds * creds,krb5_ccache ccache,krb5_kdc_rep * ret_as_reply)533 krb5_get_in_tkt(krb5_context context,
534 krb5_flags options,
535 const krb5_addresses *addrs,
536 const krb5_enctype *etypes,
537 const krb5_preauthtype *ptypes,
538 krb5_key_proc key_proc,
539 krb5_const_pointer keyseed,
540 krb5_decrypt_proc decrypt_proc,
541 krb5_const_pointer decryptarg,
542 krb5_creds *creds,
543 krb5_ccache ccache,
544 krb5_kdc_rep *ret_as_reply)
545 KRB5_DEPRECATED_FUNCTION("Use X instead")
546 {
547 krb5_error_code ret;
548
549 ret = krb5_get_in_cred (context,
550 options,
551 addrs,
552 etypes,
553 ptypes,
554 NULL,
555 key_proc,
556 keyseed,
557 decrypt_proc,
558 decryptarg,
559 creds,
560 ret_as_reply);
561 if(ret)
562 return ret;
563 if (ccache)
564 ret = krb5_cc_store_cred (context, ccache, creds);
565 return ret;
566 }
567
568 #endif /* HEIMDAL_SMALLER */
569