Line data Source code
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 :
38 : static krb5_error_code
39 0 : make_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 0 : 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 0 : krb5_us_timeofday (context, &p.patimestamp, &usec);
53 0 : usec2 = usec;
54 0 : p.pausec = &usec2;
55 :
56 0 : ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
57 0 : if (ret)
58 0 : return ret;
59 0 : if(buf_size != len)
60 0 : krb5_abortx(context, "internal error in ASN.1 encoder");
61 0 : ret = krb5_crypto_init(context, key, 0, &crypto);
62 0 : if (ret) {
63 0 : free(buf);
64 0 : return ret;
65 : }
66 0 : ret = krb5_encrypt_EncryptedData(context,
67 : crypto,
68 : KRB5_KU_PA_ENC_TIMESTAMP,
69 : buf,
70 : len,
71 : 0,
72 : &encdata);
73 0 : free(buf);
74 0 : krb5_crypto_destroy(context, crypto);
75 0 : if (ret)
76 0 : return ret;
77 :
78 0 : ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
79 0 : free_EncryptedData(&encdata);
80 0 : if (ret)
81 0 : return ret;
82 0 : if(buf_size != len)
83 0 : krb5_abortx(context, "internal error in ASN.1 encoder");
84 0 : pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
85 0 : pa->padata_value.length = len;
86 0 : pa->padata_value.data = buf;
87 0 : return 0;
88 : }
89 :
90 : static krb5_error_code
91 0 : add_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 0 : if(salt == NULL) {
107 : /* default to standard salt */
108 0 : ret = krb5_get_pw_salt (context, client, &salt2);
109 0 : if (ret)
110 0 : return ret;
111 0 : salt = &salt2;
112 : }
113 0 : if (!enctypes) {
114 0 : enctypes = context->etypes;
115 0 : netypes = 0;
116 0 : for (ep = enctypes; *ep != ETYPE_NULL; ep++)
117 0 : netypes++;
118 : }
119 0 : pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
120 0 : if (pa2 == NULL) {
121 0 : krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
122 0 : return ENOMEM;
123 : }
124 0 : md->val = pa2;
125 :
126 0 : for (i = 0; i < netypes; ++i) {
127 : krb5_keyblock *key;
128 :
129 0 : ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
130 0 : if (ret)
131 0 : continue;
132 0 : ret = make_pa_enc_timestamp (context, &md->val[md->len],
133 0 : enctypes[i], key);
134 0 : krb5_free_keyblock (context, key);
135 0 : if (ret)
136 0 : return ret;
137 0 : ++md->len;
138 : }
139 0 : if(salt == &salt2)
140 0 : krb5_free_salt(context, salt2);
141 0 : return 0;
142 : }
143 :
144 : static krb5_error_code
145 0 : init_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 0 : memset(a, 0, sizeof(*a));
161 :
162 0 : a->pvno = 5;
163 0 : a->msg_type = krb_as_req;
164 0 : a->req_body.kdc_options = opts;
165 0 : a->req_body.cname = malloc(sizeof(*a->req_body.cname));
166 0 : if (a->req_body.cname == NULL) {
167 0 : ret = ENOMEM;
168 0 : krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
169 0 : goto fail;
170 : }
171 0 : a->req_body.sname = malloc(sizeof(*a->req_body.sname));
172 0 : if (a->req_body.sname == NULL) {
173 0 : ret = ENOMEM;
174 0 : krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
175 0 : goto fail;
176 : }
177 0 : ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
178 0 : if (ret)
179 0 : goto fail;
180 0 : ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
181 0 : if (ret)
182 0 : goto fail;
183 0 : ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
184 0 : if (ret)
185 0 : goto fail;
186 :
187 0 : if(creds->times.starttime) {
188 0 : a->req_body.from = malloc(sizeof(*a->req_body.from));
189 0 : if (a->req_body.from == NULL) {
190 0 : ret = ENOMEM;
191 0 : krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
192 0 : goto fail;
193 : }
194 0 : *a->req_body.from = creds->times.starttime;
195 : }
196 0 : if(creds->times.endtime){
197 0 : ALLOC(a->req_body.till, 1);
198 0 : *a->req_body.till = creds->times.endtime;
199 : }
200 0 : if(creds->times.renew_till){
201 0 : a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
202 0 : if (a->req_body.rtime == NULL) {
203 0 : ret = ENOMEM;
204 0 : krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
205 0 : goto fail;
206 : }
207 0 : *a->req_body.rtime = creds->times.renew_till;
208 : }
209 0 : a->req_body.nonce = nonce;
210 0 : ret = _krb5_init_etype(context,
211 : KRB5_PDU_AS_REQUEST,
212 : &a->req_body.etype.len,
213 0 : &a->req_body.etype.val,
214 : etypes);
215 0 : if (ret)
216 0 : goto fail;
217 :
218 : /*
219 : * This means no addresses
220 : */
221 :
222 0 : if (addrs && addrs->len == 0) {
223 0 : a->req_body.addresses = NULL;
224 : } else {
225 0 : a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
226 0 : if (a->req_body.addresses == NULL) {
227 0 : ret = ENOMEM;
228 0 : krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
229 0 : goto fail;
230 : }
231 :
232 0 : if (addrs)
233 0 : ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
234 : else {
235 0 : ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
236 0 : if(ret == 0 && a->req_body.addresses->len == 0) {
237 0 : free(a->req_body.addresses);
238 0 : a->req_body.addresses = NULL;
239 : }
240 : }
241 0 : if (ret)
242 0 : return ret;
243 : }
244 :
245 0 : a->req_body.enc_authorization_data = NULL;
246 0 : a->req_body.additional_tickets = NULL;
247 :
248 0 : if(preauth != NULL) {
249 : size_t i;
250 0 : ALLOC(a->padata, 1);
251 0 : if(a->padata == NULL) {
252 0 : ret = ENOMEM;
253 0 : krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
254 0 : goto fail;
255 : }
256 0 : a->padata->val = NULL;
257 0 : a->padata->len = 0;
258 0 : for(i = 0; i < preauth->len; i++) {
259 0 : if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
260 : size_t j;
261 :
262 0 : for(j = 0; j < preauth->val[i].info.len; j++) {
263 0 : krb5_salt *sp = &salt;
264 0 : if(preauth->val[i].info.val[j].salttype)
265 0 : salt.salttype = *preauth->val[i].info.val[j].salttype;
266 : else
267 0 : salt.salttype = KRB5_PW_SALT;
268 0 : if(preauth->val[i].info.val[j].salt)
269 0 : salt.saltvalue = *preauth->val[i].info.val[j].salt;
270 : else
271 0 : if(salt.salttype == KRB5_PW_SALT)
272 0 : sp = NULL;
273 : else
274 0 : krb5_data_zero(&salt.saltvalue);
275 0 : ret = add_padata(context, a->padata, creds->client,
276 : key_proc, keyseed,
277 0 : &preauth->val[i].info.val[j].etype, 1,
278 : sp);
279 0 : if (ret == 0)
280 0 : break;
281 : }
282 : }
283 : }
284 : } else
285 : /* not sure this is the way to use `ptypes' */
286 0 : if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
287 0 : a->padata = NULL;
288 0 : else if (*ptypes == KRB5_PADATA_ENC_TIMESTAMP) {
289 0 : ALLOC(a->padata, 1);
290 0 : if (a->padata == NULL) {
291 0 : ret = ENOMEM;
292 0 : krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
293 0 : goto fail;
294 : }
295 0 : a->padata->len = 0;
296 0 : a->padata->val = NULL;
297 :
298 : /* make a v5 salted pa-data */
299 0 : add_padata(context, a->padata, creds->client,
300 0 : key_proc, keyseed, a->req_body.etype.val,
301 : a->req_body.etype.len, NULL);
302 :
303 : /* make a v4 salted pa-data */
304 0 : salt.salttype = KRB5_PW_SALT;
305 0 : krb5_data_zero(&salt.saltvalue);
306 0 : add_padata(context, a->padata, creds->client,
307 0 : key_proc, keyseed, a->req_body.etype.val,
308 : a->req_body.etype.len, &salt);
309 : } else {
310 0 : ret = KRB5_PREAUTH_BAD_TYPE;
311 0 : krb5_set_error_message (context, ret,
312 0 : N_("pre-auth type %d not supported", ""),
313 : *ptypes);
314 0 : goto fail;
315 : }
316 0 : return 0;
317 0 : fail:
318 0 : free_AS_REQ(a);
319 0 : return ret;
320 : }
321 :
322 : static int
323 0 : set_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 0 : if(error->e_data) {
332 : METHOD_DATA md;
333 : size_t i;
334 0 : decode_METHOD_DATA(error->e_data->data,
335 0 : error->e_data->length,
336 : &md,
337 : NULL);
338 0 : for(i = 0; i < md.len; i++){
339 0 : switch(md.val[i].padata_type){
340 0 : case KRB5_PADATA_ENC_TIMESTAMP:
341 0 : *ptypes = ptypes2;
342 0 : break;
343 0 : case KRB5_PADATA_ETYPE_INFO:
344 0 : *preauth = &preauth2;
345 0 : ALLOC_SEQ(*preauth, 1);
346 0 : (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
347 0 : decode_ETYPE_INFO(md.val[i].padata_value.data,
348 0 : md.val[i].padata_value.length,
349 0 : &(*preauth)->val[0].info,
350 : NULL);
351 0 : break;
352 0 : default:
353 0 : break;
354 : }
355 : }
356 0 : free_METHOD_DATA(&md);
357 : } else {
358 0 : *ptypes = ptypes2;
359 : }
360 0 : return(1);
361 : }
362 :
363 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
364 0 : krb5_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 0 : 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 0 : krb5_preauthdata *my_preauth = NULL;
390 : unsigned nonce;
391 : int done;
392 :
393 0 : opts = int2KDCOptions(options);
394 :
395 0 : krb5_generate_random_block (&nonce, sizeof(nonce));
396 0 : nonce &= 0xffffffff;
397 :
398 : do {
399 0 : done = 1;
400 0 : 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 0 : if (my_preauth) {
412 0 : free_ETYPE_INFO(&my_preauth->val[0].info);
413 0 : free (my_preauth->val);
414 0 : my_preauth = NULL;
415 : }
416 0 : if (ret)
417 0 : return ret;
418 :
419 0 : ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
420 0 : free_AS_REQ(&a);
421 0 : if (ret)
422 0 : return ret;
423 0 : if(len != req.length)
424 0 : krb5_abortx(context, "internal error in ASN.1 encoder");
425 :
426 0 : ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
427 0 : krb5_data_free(&req);
428 0 : if (ret)
429 0 : return ret;
430 :
431 0 : memset (&rep, 0, sizeof(rep));
432 0 : ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
433 0 : if(ret) {
434 : /* let's try to parse it as a KRB-ERROR */
435 : KRB_ERROR error;
436 : int ret2;
437 :
438 0 : ret2 = krb5_rd_error(context, &resp, &error);
439 0 : if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
440 0 : ret = KRB5KRB_AP_ERR_V4_REPLY;
441 0 : krb5_data_free(&resp);
442 0 : if (ret2 == 0) {
443 0 : 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 0 : if (!ptypes && !preauth
447 0 : && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
448 : #if 0
449 : || ret == KRB5KDC_ERR_BADOPTION
450 : #endif
451 0 : && set_ptypes(context, &error, &ptypes, &my_preauth)) {
452 0 : done = 0;
453 0 : preauth = my_preauth;
454 0 : krb5_free_error_contents(context, &error);
455 0 : krb5_clear_error_message(context);
456 0 : continue;
457 : }
458 0 : if(ret_as_reply)
459 0 : ret_as_reply->error = error;
460 : else
461 0 : free_KRB_ERROR (&error);
462 0 : return ret;
463 : }
464 0 : return ret;
465 : }
466 0 : krb5_data_free(&resp);
467 0 : } while(!done);
468 :
469 0 : pa = NULL;
470 0 : etype = rep.kdc_rep.enc_part.etype;
471 0 : if(rep.kdc_rep.padata){
472 0 : int i = 0;
473 0 : pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
474 : KRB5_PADATA_PW_SALT, &i);
475 0 : if(pa == NULL) {
476 0 : i = 0;
477 0 : pa = krb5_find_padata(rep.kdc_rep.padata->val,
478 0 : rep.kdc_rep.padata->len,
479 : KRB5_PADATA_AFS3_SALT, &i);
480 : }
481 : }
482 0 : if(pa) {
483 0 : salt.salttype = (krb5_salttype)pa->padata_type;
484 0 : salt.saltvalue = pa->padata_value;
485 :
486 0 : ret = (*key_proc)(context, etype, salt, keyseed, &key);
487 : } else {
488 : /* make a v5 salted pa-data */
489 0 : ret = krb5_get_pw_salt (context, creds->client, &salt);
490 :
491 0 : if (ret)
492 0 : goto out;
493 0 : ret = (*key_proc)(context, etype, salt, keyseed, &key);
494 0 : krb5_free_salt(context, salt);
495 : }
496 0 : if (ret)
497 0 : goto out;
498 :
499 : {
500 0 : unsigned flags = EXTRACT_TICKET_TIMESYNC;
501 0 : if (opts.request_anonymous)
502 0 : flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
503 :
504 0 : 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 0 : memset (key->keyvalue.data, 0, key->keyvalue.length);
517 0 : krb5_free_keyblock_contents (context, key);
518 0 : free (key);
519 :
520 0 : out:
521 0 : if (ret == 0 && ret_as_reply)
522 0 : *ret_as_reply = rep;
523 : else
524 0 : krb5_free_kdc_rep (context, &rep);
525 0 : return ret;
526 : }
527 :
528 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
529 0 : krb5_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 0 : 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 0 : if(ret)
558 0 : return ret;
559 0 : if (ccache)
560 0 : ret = krb5_cc_store_cred (context, ccache, creds);
561 0 : return ret;
562 : }
563 :
564 : #endif /* HEIMDAL_SMALLER */
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