source: heimdal/trunk/lib/krb5/init_creds_pw.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: 52.6 KB
Line 
1/*
2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Portions Copyright (c) 2009 Apple Inc. 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#include "krb5_locl.h"
37
38typedef struct krb5_get_init_creds_ctx {
39 KDCOptions flags;
40 krb5_creds cred;
41 krb5_addresses *addrs;
42 krb5_enctype *etypes;
43 krb5_preauthtype *pre_auth_types;
44 char *in_tkt_service;
45 unsigned nonce;
46 unsigned pk_nonce;
47
48 krb5_data req_buffer;
49 AS_REQ as_req;
50 int pa_counter;
51
52 /* password and keytab_data is freed on completion */
53 char *password;
54 krb5_keytab_key_proc_args *keytab_data;
55
56 krb5_pointer *keyseed;
57 krb5_s2k_proc keyproc;
58
59 krb5_get_init_creds_tristate req_pac;
60
61 krb5_pk_init_ctx pk_init_ctx;
62 int ic_flags;
63
64 int used_pa_types;
65#define USED_PKINIT 1
66#define USED_PKINIT_W2K 2
67#define USED_ENC_TS_GUESS 4
68#define USED_ENC_TS_INFO 8
69
70 METHOD_DATA md;
71 KRB_ERROR error;
72 AS_REP as_rep;
73 EncKDCRepPart enc_part;
74
75 krb5_prompter_fct prompter;
76 void *prompter_data;
77
78 struct pa_info_data *ppaid;
79
80} krb5_get_init_creds_ctx;
81
82
83struct pa_info_data {
84 krb5_enctype etype;
85 krb5_salt salt;
86 krb5_data *s2kparams;
87};
88
89static void
90free_paid(krb5_context context, struct pa_info_data *ppaid)
91{
92 krb5_free_salt(context, ppaid->salt);
93 if (ppaid->s2kparams)
94 krb5_free_data(context, ppaid->s2kparams);
95}
96
97static krb5_error_code KRB5_CALLCONV
98default_s2k_func(krb5_context context, krb5_enctype type,
99 krb5_const_pointer keyseed,
100 krb5_salt salt, krb5_data *s2kparms,
101 krb5_keyblock **key)
102{
103 krb5_error_code ret;
104 krb5_data password;
105 krb5_data opaque;
106
107 _krb5_debug(context, 5, "krb5_get_init_creds: using default_s2k_func");
108
109 password.data = rk_UNCONST(keyseed);
110 password.length = strlen(keyseed);
111 if (s2kparms)
112 opaque = *s2kparms;
113 else
114 krb5_data_zero(&opaque);
115
116 *key = malloc(sizeof(**key));
117 if (*key == NULL)
118 return ENOMEM;
119 ret = krb5_string_to_key_data_salt_opaque(context, type, password,
120 salt, opaque, *key);
121 if (ret) {
122 free(*key);
123 *key = NULL;
124 }
125 return ret;
126}
127
128static void
129free_init_creds_ctx(krb5_context context, krb5_init_creds_context ctx)
130{
131 if (ctx->etypes)
132 free(ctx->etypes);
133 if (ctx->pre_auth_types)
134 free (ctx->pre_auth_types);
135 if (ctx->in_tkt_service)
136 free(ctx->in_tkt_service);
137 if (ctx->keytab_data)
138 free(ctx->keytab_data);
139 if (ctx->password) {
140 memset(ctx->password, 0, strlen(ctx->password));
141 free(ctx->password);
142 }
143 krb5_data_free(&ctx->req_buffer);
144 krb5_free_cred_contents(context, &ctx->cred);
145 free_METHOD_DATA(&ctx->md);
146 free_AS_REP(&ctx->as_rep);
147 free_EncKDCRepPart(&ctx->enc_part);
148 free_KRB_ERROR(&ctx->error);
149 free_AS_REQ(&ctx->as_req);
150 if (ctx->ppaid) {
151 free_paid(context, ctx->ppaid);
152 free(ctx->ppaid);
153 }
154 memset(ctx, 0, sizeof(*ctx));
155}
156
157static int
158get_config_time (krb5_context context,
159 const char *realm,
160 const char *name,
161 int def)
162{
163 int ret;
164
165 ret = krb5_config_get_time (context, NULL,
166 "realms",
167 realm,
168 name,
169 NULL);
170 if (ret >= 0)
171 return ret;
172 ret = krb5_config_get_time (context, NULL,
173 "libdefaults",
174 name,
175 NULL);
176 if (ret >= 0)
177 return ret;
178 return def;
179}
180
181static krb5_error_code
182init_cred (krb5_context context,
183 krb5_creds *cred,
184 krb5_principal client,
185 krb5_deltat start_time,
186 krb5_get_init_creds_opt *options)
187{
188 krb5_error_code ret;
189 int tmp;
190 krb5_timestamp now;
191
192 krb5_timeofday (context, &now);
193
194 memset (cred, 0, sizeof(*cred));
195
196 if (client)
197 krb5_copy_principal(context, client, &cred->client);
198 else {
199 ret = krb5_get_default_principal (context,
200 &cred->client);
201 if (ret)
202 goto out;
203 }
204
205 if (start_time)
206 cred->times.starttime = now + start_time;
207
208 if (options->flags & KRB5_GET_INIT_CREDS_OPT_TKT_LIFE)
209 tmp = options->tkt_life;
210 else
211 tmp = 10 * 60 * 60;
212 cred->times.endtime = now + tmp;
213
214 if ((options->flags & KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE) &&
215 options->renew_life > 0) {
216 cred->times.renew_till = now + options->renew_life;
217 }
218
219 return 0;
220
221out:
222 krb5_free_cred_contents (context, cred);
223 return ret;
224}
225
226/*
227 * Print a message (str) to the user about the expiration in `lr'
228 */
229
230static void
231report_expiration (krb5_context context,
232 krb5_prompter_fct prompter,
233 krb5_data *data,
234 const char *str,
235 time_t now)
236{
237 char *p = NULL;
238
239 if (asprintf(&p, "%s%s", str, ctime(&now)) < 0 || p == NULL)
240 return;
241 (*prompter)(context, data, NULL, p, 0, NULL);
242 free(p);
243}
244
245/*
246 * Check the context, and in the case there is a expiration warning,
247 * use the prompter to print the warning.
248 *
249 * @param context A Kerberos 5 context.
250 * @param options An GIC options structure
251 * @param ctx The krb5_init_creds_context check for expiration.
252 */
253
254static krb5_error_code
255process_last_request(krb5_context context,
256 krb5_get_init_creds_opt *options,
257 krb5_init_creds_context ctx)
258{
259 krb5_const_realm realm;
260 LastReq *lr;
261 krb5_boolean reported = FALSE;
262 krb5_timestamp sec;
263 time_t t;
264 size_t i;
265
266 /*
267 * First check if there is a API consumer.
268 */
269
270 realm = krb5_principal_get_realm (context, ctx->cred.client);
271 lr = &ctx->enc_part.last_req;
272
273 if (options && options->opt_private && options->opt_private->lr.func) {
274 krb5_last_req_entry **lre;
275
276 lre = calloc(lr->len + 1, sizeof(**lre));
277 if (lre == NULL) {
278 krb5_set_error_message(context, ENOMEM,
279 N_("malloc: out of memory", ""));
280 return ENOMEM;
281 }
282 for (i = 0; i < lr->len; i++) {
283 lre[i] = calloc(1, sizeof(*lre[i]));
284 if (lre[i] == NULL)
285 break;
286 lre[i]->lr_type = lr->val[i].lr_type;
287 lre[i]->value = lr->val[i].lr_value;
288 }
289
290 (*options->opt_private->lr.func)(context, lre,
291 options->opt_private->lr.ctx);
292
293 for (i = 0; i < lr->len; i++)
294 free(lre[i]);
295 free(lre);
296 }
297
298 /*
299 * Now check if we should prompt the user
300 */
301
302 if (ctx->prompter == NULL)
303 return 0;
304
305 krb5_timeofday (context, &sec);
306
307 t = sec + get_config_time (context,
308 realm,
309 "warn_pwexpire",
310 7 * 24 * 60 * 60);
311
312 for (i = 0; i < lr->len; ++i) {
313 if (lr->val[i].lr_value <= t) {
314 switch (abs(lr->val[i].lr_type)) {
315 case LR_PW_EXPTIME :
316 report_expiration(context, ctx->prompter,
317 ctx->prompter_data,
318 "Your password will expire at ",
319 lr->val[i].lr_value);
320 reported = TRUE;
321 break;
322 case LR_ACCT_EXPTIME :
323 report_expiration(context, ctx->prompter,
324 ctx->prompter_data,
325 "Your account will expire at ",
326 lr->val[i].lr_value);
327 reported = TRUE;
328 break;
329 }
330 }
331 }
332
333 if (!reported
334 && ctx->enc_part.key_expiration
335 && *ctx->enc_part.key_expiration <= t) {
336 report_expiration(context, ctx->prompter,
337 ctx->prompter_data,
338 "Your password/account will expire at ",
339 *ctx->enc_part.key_expiration);
340 }
341 return 0;
342}
343
344static krb5_addresses no_addrs = { 0, NULL };
345
346static krb5_error_code
347get_init_creds_common(krb5_context context,
348 krb5_principal client,
349 krb5_deltat start_time,
350 krb5_get_init_creds_opt *options,
351 krb5_init_creds_context ctx)
352{
353 krb5_get_init_creds_opt *default_opt = NULL;
354 krb5_error_code ret;
355 krb5_enctype *etypes;
356 krb5_preauthtype *pre_auth_types;
357
358 memset(ctx, 0, sizeof(*ctx));
359
360 if (options == NULL) {
361 const char *realm = krb5_principal_get_realm(context, client);
362
363 krb5_get_init_creds_opt_alloc (context, &default_opt);
364 options = default_opt;
365 krb5_get_init_creds_opt_set_default_flags(context, NULL, realm, options);
366 }
367
368 if (options->opt_private) {
369 if (options->opt_private->password) {
370 ret = krb5_init_creds_set_password(context, ctx,
371 options->opt_private->password);
372 if (ret)
373 goto out;
374 }
375
376 ctx->keyproc = options->opt_private->key_proc;
377 ctx->req_pac = options->opt_private->req_pac;
378 ctx->pk_init_ctx = options->opt_private->pk_init_ctx;
379 ctx->ic_flags = options->opt_private->flags;
380 } else
381 ctx->req_pac = KRB5_INIT_CREDS_TRISTATE_UNSET;
382
383 if (ctx->keyproc == NULL)
384 ctx->keyproc = default_s2k_func;
385
386 /* Enterprise name implicitly turns on canonicalize */
387 if ((ctx->ic_flags & KRB5_INIT_CREDS_CANONICALIZE) ||
388 krb5_principal_get_type(context, client) == KRB5_NT_ENTERPRISE_PRINCIPAL)
389 ctx->flags.canonicalize = 1;
390
391 ctx->pre_auth_types = NULL;
392 ctx->addrs = NULL;
393 ctx->etypes = NULL;
394 ctx->pre_auth_types = NULL;
395
396 ret = init_cred(context, &ctx->cred, client, start_time, options);
397 if (ret) {
398 if (default_opt)
399 krb5_get_init_creds_opt_free(context, default_opt);
400 return ret;
401 }
402
403 ret = krb5_init_creds_set_service(context, ctx, NULL);
404 if (ret)
405 goto out;
406
407 if (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE)
408 ctx->flags.forwardable = options->forwardable;
409
410 if (options->flags & KRB5_GET_INIT_CREDS_OPT_PROXIABLE)
411 ctx->flags.proxiable = options->proxiable;
412
413 if (start_time)
414 ctx->flags.postdated = 1;
415 if (ctx->cred.times.renew_till)
416 ctx->flags.renewable = 1;
417 if (options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST) {
418 ctx->addrs = options->address_list;
419 } else if (options->opt_private) {
420 switch (options->opt_private->addressless) {
421 case KRB5_INIT_CREDS_TRISTATE_UNSET:
422#if KRB5_ADDRESSLESS_DEFAULT == TRUE
423 ctx->addrs = &no_addrs;
424#else
425 ctx->addrs = NULL;
426#endif
427 break;
428 case KRB5_INIT_CREDS_TRISTATE_FALSE:
429 ctx->addrs = NULL;
430 break;
431 case KRB5_INIT_CREDS_TRISTATE_TRUE:
432 ctx->addrs = &no_addrs;
433 break;
434 }
435 }
436 if (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST) {
437 if (ctx->etypes)
438 free(ctx->etypes);
439
440 etypes = malloc((options->etype_list_length + 1)
441 * sizeof(krb5_enctype));
442 if (etypes == NULL) {
443 ret = ENOMEM;
444 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
445 goto out;
446 }
447 memcpy (etypes, options->etype_list,
448 options->etype_list_length * sizeof(krb5_enctype));
449 etypes[options->etype_list_length] = ETYPE_NULL;
450 ctx->etypes = etypes;
451 }
452 if (options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST) {
453 pre_auth_types = malloc((options->preauth_list_length + 1)
454 * sizeof(krb5_preauthtype));
455 if (pre_auth_types == NULL) {
456 ret = ENOMEM;
457 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
458 goto out;
459 }
460 memcpy (pre_auth_types, options->preauth_list,
461 options->preauth_list_length * sizeof(krb5_preauthtype));
462 pre_auth_types[options->preauth_list_length] = KRB5_PADATA_NONE;
463 ctx->pre_auth_types = pre_auth_types;
464 }
465 if (options->flags & KRB5_GET_INIT_CREDS_OPT_ANONYMOUS)
466 ctx->flags.request_anonymous = options->anonymous;
467 if (default_opt)
468 krb5_get_init_creds_opt_free(context, default_opt);
469 return 0;
470 out:
471 if (default_opt)
472 krb5_get_init_creds_opt_free(context, default_opt);
473 return ret;
474}
475
476static krb5_error_code
477change_password (krb5_context context,
478 krb5_principal client,
479 const char *password,
480 char *newpw,
481 size_t newpw_sz,
482 krb5_prompter_fct prompter,
483 void *data,
484 krb5_get_init_creds_opt *old_options)
485{
486 krb5_prompt prompts[2];
487 krb5_error_code ret;
488 krb5_creds cpw_cred;
489 char buf1[BUFSIZ], buf2[BUFSIZ];
490 krb5_data password_data[2];
491 int result_code;
492 krb5_data result_code_string;
493 krb5_data result_string;
494 char *p;
495 krb5_get_init_creds_opt *options;
496
497 memset (&cpw_cred, 0, sizeof(cpw_cred));
498
499 ret = krb5_get_init_creds_opt_alloc(context, &options);
500 if (ret)
501 return ret;
502 krb5_get_init_creds_opt_set_tkt_life (options, 60);
503 krb5_get_init_creds_opt_set_forwardable (options, FALSE);
504 krb5_get_init_creds_opt_set_proxiable (options, FALSE);
505 if (old_options && old_options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST)
506 krb5_get_init_creds_opt_set_preauth_list (options,
507 old_options->preauth_list,
508 old_options->preauth_list_length);
509
510 krb5_data_zero (&result_code_string);
511 krb5_data_zero (&result_string);
512
513 ret = krb5_get_init_creds_password (context,
514 &cpw_cred,
515 client,
516 password,
517 prompter,
518 data,
519 0,
520 "kadmin/changepw",
521 options);
522 krb5_get_init_creds_opt_free(context, options);
523 if (ret)
524 goto out;
525
526 for(;;) {
527 password_data[0].data = buf1;
528 password_data[0].length = sizeof(buf1);
529
530 prompts[0].hidden = 1;
531 prompts[0].prompt = "New password: ";
532 prompts[0].reply = &password_data[0];
533 prompts[0].type = KRB5_PROMPT_TYPE_NEW_PASSWORD;
534
535 password_data[1].data = buf2;
536 password_data[1].length = sizeof(buf2);
537
538 prompts[1].hidden = 1;
539 prompts[1].prompt = "Repeat new password: ";
540 prompts[1].reply = &password_data[1];
541 prompts[1].type = KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN;
542
543 ret = (*prompter) (context, data, NULL, "Changing password",
544 2, prompts);
545 if (ret) {
546 memset (buf1, 0, sizeof(buf1));
547 memset (buf2, 0, sizeof(buf2));
548 goto out;
549 }
550
551 if (strcmp (buf1, buf2) == 0)
552 break;
553 memset (buf1, 0, sizeof(buf1));
554 memset (buf2, 0, sizeof(buf2));
555 }
556
557 ret = krb5_set_password (context,
558 &cpw_cred,
559 buf1,
560 client,
561 &result_code,
562 &result_code_string,
563 &result_string);
564 if (ret)
565 goto out;
566 if (asprintf(&p, "%s: %.*s\n",
567 result_code ? "Error" : "Success",
568 (int)result_string.length,
569 result_string.length > 0 ? (char*)result_string.data : "") < 0)
570 {
571 ret = ENOMEM;
572 goto out;
573 }
574
575 /* return the result */
576 (*prompter) (context, data, NULL, p, 0, NULL);
577
578 free (p);
579 if (result_code == 0) {
580 strlcpy (newpw, buf1, newpw_sz);
581 ret = 0;
582 } else {
583 ret = ENOTTY;
584 krb5_set_error_message(context, ret,
585 N_("failed changing password", ""));
586 }
587
588out:
589 memset (buf1, 0, sizeof(buf1));
590 memset (buf2, 0, sizeof(buf2));
591 krb5_data_free (&result_string);
592 krb5_data_free (&result_code_string);
593 krb5_free_cred_contents (context, &cpw_cred);
594 return ret;
595}
596
597
598KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
599krb5_keyblock_key_proc (krb5_context context,
600 krb5_keytype type,
601 krb5_data *salt,
602 krb5_const_pointer keyseed,
603 krb5_keyblock **key)
604{
605 return krb5_copy_keyblock (context, keyseed, key);
606}
607
608/*
609 *
610 */
611
612static krb5_error_code
613init_as_req (krb5_context context,
614 KDCOptions opts,
615 const krb5_creds *creds,
616 const krb5_addresses *addrs,
617 const krb5_enctype *etypes,
618 AS_REQ *a)
619{
620 krb5_error_code ret;
621
622 memset(a, 0, sizeof(*a));
623
624 a->pvno = 5;
625 a->msg_type = krb_as_req;
626 a->req_body.kdc_options = opts;
627 a->req_body.cname = malloc(sizeof(*a->req_body.cname));
628 if (a->req_body.cname == NULL) {
629 ret = ENOMEM;
630 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
631 goto fail;
632 }
633 a->req_body.sname = malloc(sizeof(*a->req_body.sname));
634 if (a->req_body.sname == NULL) {
635 ret = ENOMEM;
636 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
637 goto fail;
638 }
639
640 ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
641 if (ret)
642 goto fail;
643 ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
644 if (ret)
645 goto fail;
646
647 ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
648 if (ret)
649 goto fail;
650
651 if(creds->times.starttime) {
652 a->req_body.from = malloc(sizeof(*a->req_body.from));
653 if (a->req_body.from == NULL) {
654 ret = ENOMEM;
655 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
656 goto fail;
657 }
658 *a->req_body.from = creds->times.starttime;
659 }
660 if(creds->times.endtime){
661 ALLOC(a->req_body.till, 1);
662 *a->req_body.till = creds->times.endtime;
663 }
664 if(creds->times.renew_till){
665 a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
666 if (a->req_body.rtime == NULL) {
667 ret = ENOMEM;
668 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
669 goto fail;
670 }
671 *a->req_body.rtime = creds->times.renew_till;
672 }
673 a->req_body.nonce = 0;
674 ret = _krb5_init_etype(context,
675 KRB5_PDU_AS_REQUEST,
676 &a->req_body.etype.len,
677 &a->req_body.etype.val,
678 etypes);
679 if (ret)
680 goto fail;
681
682 /*
683 * This means no addresses
684 */
685
686 if (addrs && addrs->len == 0) {
687 a->req_body.addresses = NULL;
688 } else {
689 a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
690 if (a->req_body.addresses == NULL) {
691 ret = ENOMEM;
692 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
693 goto fail;
694 }
695
696 if (addrs)
697 ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
698 else {
699 ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
700 if(ret == 0 && a->req_body.addresses->len == 0) {
701 free(a->req_body.addresses);
702 a->req_body.addresses = NULL;
703 }
704 }
705 if (ret)
706 goto fail;
707 }
708
709 a->req_body.enc_authorization_data = NULL;
710 a->req_body.additional_tickets = NULL;
711
712 a->padata = NULL;
713
714 return 0;
715 fail:
716 free_AS_REQ(a);
717 memset(a, 0, sizeof(*a));
718 return ret;
719}
720
721
722static krb5_error_code
723set_paid(struct pa_info_data *paid, krb5_context context,
724 krb5_enctype etype,
725 krb5_salttype salttype, void *salt_string, size_t salt_len,
726 krb5_data *s2kparams)
727{
728 paid->etype = etype;
729 paid->salt.salttype = salttype;
730 paid->salt.saltvalue.data = malloc(salt_len + 1);
731 if (paid->salt.saltvalue.data == NULL) {
732 krb5_clear_error_message(context);
733 return ENOMEM;
734 }
735 memcpy(paid->salt.saltvalue.data, salt_string, salt_len);
736 ((char *)paid->salt.saltvalue.data)[salt_len] = '\0';
737 paid->salt.saltvalue.length = salt_len;
738 if (s2kparams) {
739 krb5_error_code ret;
740
741 ret = krb5_copy_data(context, s2kparams, &paid->s2kparams);
742 if (ret) {
743 krb5_clear_error_message(context);
744 krb5_free_salt(context, paid->salt);
745 return ret;
746 }
747 } else
748 paid->s2kparams = NULL;
749
750 return 0;
751}
752
753static struct pa_info_data *
754pa_etype_info2(krb5_context context,
755 const krb5_principal client,
756 const AS_REQ *asreq,
757 struct pa_info_data *paid,
758 heim_octet_string *data)
759{
760 krb5_error_code ret;
761 ETYPE_INFO2 e;
762 size_t sz;
763 size_t i, j;
764
765 memset(&e, 0, sizeof(e));
766 ret = decode_ETYPE_INFO2(data->data, data->length, &e, &sz);
767 if (ret)
768 goto out;
769 if (e.len == 0)
770 goto out;
771 for (j = 0; j < asreq->req_body.etype.len; j++) {
772 for (i = 0; i < e.len; i++) {
773 if (asreq->req_body.etype.val[j] == e.val[i].etype) {
774 krb5_salt salt;
775 if (e.val[i].salt == NULL)
776 ret = krb5_get_pw_salt(context, client, &salt);
777 else {
778 salt.saltvalue.data = *e.val[i].salt;
779 salt.saltvalue.length = strlen(*e.val[i].salt);
780 ret = 0;
781 }
782 if (ret == 0)
783 ret = set_paid(paid, context, e.val[i].etype,
784 KRB5_PW_SALT,
785 salt.saltvalue.data,
786 salt.saltvalue.length,
787 e.val[i].s2kparams);
788 if (e.val[i].salt == NULL)
789 krb5_free_salt(context, salt);
790 if (ret == 0) {
791 free_ETYPE_INFO2(&e);
792 return paid;
793 }
794 }
795 }
796 }
797 out:
798 free_ETYPE_INFO2(&e);
799 return NULL;
800}
801
802static struct pa_info_data *
803pa_etype_info(krb5_context context,
804 const krb5_principal client,
805 const AS_REQ *asreq,
806 struct pa_info_data *paid,
807 heim_octet_string *data)
808{
809 krb5_error_code ret;
810 ETYPE_INFO e;
811 size_t sz;
812 size_t i, j;
813
814 memset(&e, 0, sizeof(e));
815 ret = decode_ETYPE_INFO(data->data, data->length, &e, &sz);
816 if (ret)
817 goto out;
818 if (e.len == 0)
819 goto out;
820 for (j = 0; j < asreq->req_body.etype.len; j++) {
821 for (i = 0; i < e.len; i++) {
822 if (asreq->req_body.etype.val[j] == e.val[i].etype) {
823 krb5_salt salt;
824 salt.salttype = KRB5_PW_SALT;
825 if (e.val[i].salt == NULL)
826 ret = krb5_get_pw_salt(context, client, &salt);
827 else {
828 salt.saltvalue = *e.val[i].salt;
829 ret = 0;
830 }
831 if (e.val[i].salttype)
832 salt.salttype = *e.val[i].salttype;
833 if (ret == 0) {
834 ret = set_paid(paid, context, e.val[i].etype,
835 salt.salttype,
836 salt.saltvalue.data,
837 salt.saltvalue.length,
838 NULL);
839 if (e.val[i].salt == NULL)
840 krb5_free_salt(context, salt);
841 }
842 if (ret == 0) {
843 free_ETYPE_INFO(&e);
844 return paid;
845 }
846 }
847 }
848 }
849 out:
850 free_ETYPE_INFO(&e);
851 return NULL;
852}
853
854static struct pa_info_data *
855pa_pw_or_afs3_salt(krb5_context context,
856 const krb5_principal client,
857 const AS_REQ *asreq,
858 struct pa_info_data *paid,
859 heim_octet_string *data)
860{
861 krb5_error_code ret;
862 if (paid->etype == ENCTYPE_NULL)
863 return NULL;
864 ret = set_paid(paid, context,
865 paid->etype,
866 paid->salt.salttype,
867 data->data,
868 data->length,
869 NULL);
870 if (ret)
871 return NULL;
872 return paid;
873}
874
875
876struct pa_info {
877 krb5_preauthtype type;
878 struct pa_info_data *(*salt_info)(krb5_context,
879 const krb5_principal,
880 const AS_REQ *,
881 struct pa_info_data *,
882 heim_octet_string *);
883};
884
885static struct pa_info pa_prefs[] = {
886 { KRB5_PADATA_ETYPE_INFO2, pa_etype_info2 },
887 { KRB5_PADATA_ETYPE_INFO, pa_etype_info },
888 { KRB5_PADATA_PW_SALT, pa_pw_or_afs3_salt },
889 { KRB5_PADATA_AFS3_SALT, pa_pw_or_afs3_salt }
890};
891
892static PA_DATA *
893find_pa_data(const METHOD_DATA *md, unsigned type)
894{
895 size_t i;
896 if (md == NULL)
897 return NULL;
898 for (i = 0; i < md->len; i++)
899 if (md->val[i].padata_type == type)
900 return &md->val[i];
901 return NULL;
902}
903
904static struct pa_info_data *
905process_pa_info(krb5_context context,
906 const krb5_principal client,
907 const AS_REQ *asreq,
908 struct pa_info_data *paid,
909 METHOD_DATA *md)
910{
911 struct pa_info_data *p = NULL;
912 size_t i;
913
914 for (i = 0; p == NULL && i < sizeof(pa_prefs)/sizeof(pa_prefs[0]); i++) {
915 PA_DATA *pa = find_pa_data(md, pa_prefs[i].type);
916 if (pa == NULL)
917 continue;
918 paid->salt.salttype = (krb5_salttype)pa_prefs[i].type;
919 p = (*pa_prefs[i].salt_info)(context, client, asreq,
920 paid, &pa->padata_value);
921 }
922 return p;
923}
924
925static krb5_error_code
926make_pa_enc_timestamp(krb5_context context, METHOD_DATA *md,
927 krb5_enctype etype, krb5_keyblock *key)
928{
929 PA_ENC_TS_ENC p;
930 unsigned char *buf;
931 size_t buf_size;
932 size_t len = 0;
933 EncryptedData encdata;
934 krb5_error_code ret;
935 int32_t usec;
936 int usec2;
937 krb5_crypto crypto;
938
939 krb5_us_timeofday (context, &p.patimestamp, &usec);
940 usec2 = usec;
941 p.pausec = &usec2;
942
943 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
944 if (ret)
945 return ret;
946 if(buf_size != len)
947 krb5_abortx(context, "internal error in ASN.1 encoder");
948
949 ret = krb5_crypto_init(context, key, 0, &crypto);
950 if (ret) {
951 free(buf);
952 return ret;
953 }
954 ret = krb5_encrypt_EncryptedData(context,
955 crypto,
956 KRB5_KU_PA_ENC_TIMESTAMP,
957 buf,
958 len,
959 0,
960 &encdata);
961 free(buf);
962 krb5_crypto_destroy(context, crypto);
963 if (ret)
964 return ret;
965
966 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
967 free_EncryptedData(&encdata);
968 if (ret)
969 return ret;
970 if(buf_size != len)
971 krb5_abortx(context, "internal error in ASN.1 encoder");
972
973 ret = krb5_padata_add(context, md, KRB5_PADATA_ENC_TIMESTAMP, buf, len);
974 if (ret)
975 free(buf);
976 return ret;
977}
978
979static krb5_error_code
980add_enc_ts_padata(krb5_context context,
981 METHOD_DATA *md,
982 krb5_principal client,
983 krb5_s2k_proc keyproc,
984 krb5_const_pointer keyseed,
985 krb5_enctype *enctypes,
986 unsigned netypes,
987 krb5_salt *salt,
988 krb5_data *s2kparams)
989{
990 krb5_error_code ret;
991 krb5_salt salt2;
992 krb5_enctype *ep;
993 size_t i;
994
995 if(salt == NULL) {
996 /* default to standard salt */
997 ret = krb5_get_pw_salt (context, client, &salt2);
998 if (ret)
999 return ret;
1000 salt = &salt2;
1001 }
1002 if (!enctypes) {
1003 enctypes = context->etypes;
1004 netypes = 0;
1005 for (ep = enctypes; *ep != ETYPE_NULL; ep++)
1006 netypes++;
1007 }
1008
1009 for (i = 0; i < netypes; ++i) {
1010 krb5_keyblock *key;
1011
1012 _krb5_debug(context, 5, "krb5_get_init_creds: using ENC-TS with enctype %d", enctypes[i]);
1013
1014 ret = (*keyproc)(context, enctypes[i], keyseed,
1015 *salt, s2kparams, &key);
1016 if (ret)
1017 continue;
1018 ret = make_pa_enc_timestamp (context, md, enctypes[i], key);
1019 krb5_free_keyblock (context, key);
1020 if (ret)
1021 return ret;
1022 }
1023 if(salt == &salt2)
1024 krb5_free_salt(context, salt2);
1025 return 0;
1026}
1027
1028static krb5_error_code
1029pa_data_to_md_ts_enc(krb5_context context,
1030 const AS_REQ *a,
1031 const krb5_principal client,
1032 krb5_get_init_creds_ctx *ctx,
1033 struct pa_info_data *ppaid,
1034 METHOD_DATA *md)
1035{
1036 if (ctx->keyproc == NULL || ctx->keyseed == NULL)
1037 return 0;
1038
1039 if (ppaid) {
1040 add_enc_ts_padata(context, md, client,
1041 ctx->keyproc, ctx->keyseed,
1042 &ppaid->etype, 1,
1043 &ppaid->salt, ppaid->s2kparams);
1044 } else {
1045 krb5_salt salt;
1046
1047 _krb5_debug(context, 5, "krb5_get_init_creds: pa-info not found, guessing salt");
1048
1049 /* make a v5 salted pa-data */
1050 add_enc_ts_padata(context, md, client,
1051 ctx->keyproc, ctx->keyseed,
1052 a->req_body.etype.val, a->req_body.etype.len,
1053 NULL, NULL);
1054
1055 /* make a v4 salted pa-data */
1056 salt.salttype = KRB5_PW_SALT;
1057 krb5_data_zero(&salt.saltvalue);
1058 add_enc_ts_padata(context, md, client,
1059 ctx->keyproc, ctx->keyseed,
1060 a->req_body.etype.val, a->req_body.etype.len,
1061 &salt, NULL);
1062 }
1063 return 0;
1064}
1065
1066static krb5_error_code
1067pa_data_to_key_plain(krb5_context context,
1068 const krb5_principal client,
1069 krb5_get_init_creds_ctx *ctx,
1070 krb5_salt salt,
1071 krb5_data *s2kparams,
1072 krb5_enctype etype,
1073 krb5_keyblock **key)
1074{
1075 krb5_error_code ret;
1076
1077 ret = (*ctx->keyproc)(context, etype, ctx->keyseed,
1078 salt, s2kparams, key);
1079 return ret;
1080}
1081
1082
1083static krb5_error_code
1084pa_data_to_md_pkinit(krb5_context context,
1085 const AS_REQ *a,
1086 const krb5_principal client,
1087 int win2k,
1088 krb5_get_init_creds_ctx *ctx,
1089 METHOD_DATA *md)
1090{
1091 if (ctx->pk_init_ctx == NULL)
1092 return 0;
1093#ifdef PKINIT
1094 return _krb5_pk_mk_padata(context,
1095 ctx->pk_init_ctx,
1096 ctx->ic_flags,
1097 win2k,
1098 &a->req_body,
1099 ctx->pk_nonce,
1100 md);
1101#else
1102 krb5_set_error_message(context, EINVAL,
1103 N_("no support for PKINIT compiled in", ""));
1104 return EINVAL;
1105#endif
1106}
1107
1108static krb5_error_code
1109pa_data_add_pac_request(krb5_context context,
1110 krb5_get_init_creds_ctx *ctx,
1111 METHOD_DATA *md)
1112{
1113 size_t len = 0, length;
1114 krb5_error_code ret;
1115 PA_PAC_REQUEST req;
1116 void *buf;
1117
1118 switch (ctx->req_pac) {
1119 case KRB5_INIT_CREDS_TRISTATE_UNSET:
1120 return 0; /* don't bother */
1121 case KRB5_INIT_CREDS_TRISTATE_TRUE:
1122 req.include_pac = 1;
1123 break;
1124 case KRB5_INIT_CREDS_TRISTATE_FALSE:
1125 req.include_pac = 0;
1126 }
1127
1128 ASN1_MALLOC_ENCODE(PA_PAC_REQUEST, buf, length,
1129 &req, &len, ret);
1130 if (ret)
1131 return ret;
1132 if(len != length)
1133 krb5_abortx(context, "internal error in ASN.1 encoder");
1134
1135 ret = krb5_padata_add(context, md, KRB5_PADATA_PA_PAC_REQUEST, buf, len);
1136 if (ret)
1137 free(buf);
1138
1139 return 0;
1140}
1141
1142/*
1143 * Assumes caller always will free `out_md', even on error.
1144 */
1145
1146static krb5_error_code
1147process_pa_data_to_md(krb5_context context,
1148 const krb5_creds *creds,
1149 const AS_REQ *a,
1150 krb5_get_init_creds_ctx *ctx,
1151 METHOD_DATA *in_md,
1152 METHOD_DATA **out_md,
1153 krb5_prompter_fct prompter,
1154 void *prompter_data)
1155{
1156 krb5_error_code ret;
1157
1158 ALLOC(*out_md, 1);
1159 if (*out_md == NULL) {
1160 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1161 return ENOMEM;
1162 }
1163 (*out_md)->len = 0;
1164 (*out_md)->val = NULL;
1165
1166 if (_krb5_have_debug(context, 5)) {
1167 unsigned i;
1168 _krb5_debug(context, 5, "KDC send %d patypes", in_md->len);
1169 for (i = 0; i < in_md->len; i++)
1170 _krb5_debug(context, 5, "KDC send PA-DATA type: %d", in_md->val[i].padata_type);
1171 }
1172
1173 /*
1174 * Make sure we don't sent both ENC-TS and PK-INIT pa data, no
1175 * need to expose our password protecting our PKCS12 key.
1176 */
1177
1178 if (ctx->pk_init_ctx) {
1179
1180 _krb5_debug(context, 5, "krb5_get_init_creds: "
1181 "prepareing PKINIT padata (%s)",
1182 (ctx->used_pa_types & USED_PKINIT_W2K) ? "win2k" : "ietf");
1183
1184 if (ctx->used_pa_types & USED_PKINIT_W2K) {
1185 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1186 "Already tried pkinit, looping");
1187 return KRB5_GET_IN_TKT_LOOP;
1188 }
1189
1190 ret = pa_data_to_md_pkinit(context, a, creds->client,
1191 (ctx->used_pa_types & USED_PKINIT),
1192 ctx, *out_md);
1193 if (ret)
1194 return ret;
1195
1196 if (ctx->used_pa_types & USED_PKINIT)
1197 ctx->used_pa_types |= USED_PKINIT_W2K;
1198 else
1199 ctx->used_pa_types |= USED_PKINIT;
1200
1201 } else if (in_md->len != 0) {
1202 struct pa_info_data *paid, *ppaid;
1203 unsigned flag;
1204
1205 paid = calloc(1, sizeof(*paid));
1206
1207 paid->etype = ENCTYPE_NULL;
1208 ppaid = process_pa_info(context, creds->client, a, paid, in_md);
1209
1210 if (ppaid)
1211 flag = USED_ENC_TS_INFO;
1212 else
1213 flag = USED_ENC_TS_GUESS;
1214
1215 if (ctx->used_pa_types & flag) {
1216 if (ppaid)
1217 free_paid(context, ppaid);
1218 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1219 "Already tried ENC-TS-%s, looping",
1220 flag == USED_ENC_TS_INFO ? "info" : "guess");
1221 return KRB5_GET_IN_TKT_LOOP;
1222 }
1223
1224 pa_data_to_md_ts_enc(context, a, creds->client, ctx, ppaid, *out_md);
1225
1226 ctx->used_pa_types |= flag;
1227
1228 if (ppaid) {
1229 if (ctx->ppaid) {
1230 free_paid(context, ctx->ppaid);
1231 free(ctx->ppaid);
1232 }
1233 ctx->ppaid = ppaid;
1234 } else
1235 free(paid);
1236 }
1237
1238 pa_data_add_pac_request(context, ctx, *out_md);
1239
1240 if ((*out_md)->len == 0) {
1241 free(*out_md);
1242 *out_md = NULL;
1243 }
1244
1245 return 0;
1246}
1247
1248static krb5_error_code
1249process_pa_data_to_key(krb5_context context,
1250 krb5_get_init_creds_ctx *ctx,
1251 krb5_creds *creds,
1252 AS_REQ *a,
1253 AS_REP *rep,
1254 const krb5_krbhst_info *hi,
1255 krb5_keyblock **key)
1256{
1257 struct pa_info_data paid, *ppaid = NULL;
1258 krb5_error_code ret;
1259 krb5_enctype etype;
1260 PA_DATA *pa;
1261
1262 memset(&paid, 0, sizeof(paid));
1263
1264 etype = rep->enc_part.etype;
1265
1266 if (rep->padata) {
1267 paid.etype = etype;
1268 ppaid = process_pa_info(context, creds->client, a, &paid,
1269 rep->padata);
1270 }
1271 if (ppaid == NULL)
1272 ppaid = ctx->ppaid;
1273 if (ppaid == NULL) {
1274 ret = krb5_get_pw_salt (context, creds->client, &paid.salt);
1275 if (ret)
1276 return ret;
1277 paid.etype = etype;
1278 paid.s2kparams = NULL;
1279 ppaid = &paid;
1280 }
1281
1282 pa = NULL;
1283 if (rep->padata) {
1284 int idx = 0;
1285 pa = krb5_find_padata(rep->padata->val,
1286 rep->padata->len,
1287 KRB5_PADATA_PK_AS_REP,
1288 &idx);
1289 if (pa == NULL) {
1290 idx = 0;
1291 pa = krb5_find_padata(rep->padata->val,
1292 rep->padata->len,
1293 KRB5_PADATA_PK_AS_REP_19,
1294 &idx);
1295 }
1296 }
1297 if (pa && ctx->pk_init_ctx) {
1298#ifdef PKINIT
1299 _krb5_debug(context, 5, "krb5_get_init_creds: using PKINIT");
1300
1301 ret = _krb5_pk_rd_pa_reply(context,
1302 a->req_body.realm,
1303 ctx->pk_init_ctx,
1304 etype,
1305 hi,
1306 ctx->pk_nonce,
1307 &ctx->req_buffer,
1308 pa,
1309 key);
1310#else
1311 ret = EINVAL;
1312 krb5_set_error_message(context, ret, N_("no support for PKINIT compiled in", ""));
1313#endif
1314 } else if (ctx->keyseed) {
1315 _krb5_debug(context, 5, "krb5_get_init_creds: using keyproc");
1316 ret = pa_data_to_key_plain(context, creds->client, ctx,
1317 ppaid->salt, ppaid->s2kparams, etype, key);
1318 } else {
1319 ret = EINVAL;
1320 krb5_set_error_message(context, ret, N_("No usable pa data type", ""));
1321 }
1322
1323 free_paid(context, &paid);
1324 return ret;
1325}
1326
1327/**
1328 * Start a new context to get a new initial credential.
1329 *
1330 * @param context A Kerberos 5 context.
1331 * @param client The Kerberos principal to get the credential for, if
1332 * NULL is given, the default principal is used as determined by
1333 * krb5_get_default_principal().
1334 * @param prompter
1335 * @param prompter_data
1336 * @param start_time the time the ticket should start to be valid or 0 for now.
1337 * @param options a options structure, can be NULL for default options.
1338 * @param rctx A new allocated free with krb5_init_creds_free().
1339 *
1340 * @return 0 for success or an Kerberos 5 error code, see krb5_get_error_message().
1341 *
1342 * @ingroup krb5_credential
1343 */
1344
1345KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1346krb5_init_creds_init(krb5_context context,
1347 krb5_principal client,
1348 krb5_prompter_fct prompter,
1349 void *prompter_data,
1350 krb5_deltat start_time,
1351 krb5_get_init_creds_opt *options,
1352 krb5_init_creds_context *rctx)
1353{
1354 krb5_init_creds_context ctx;
1355 krb5_error_code ret;
1356
1357 *rctx = NULL;
1358
1359 ctx = calloc(1, sizeof(*ctx));
1360 if (ctx == NULL) {
1361 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1362 return ENOMEM;
1363 }
1364
1365 ret = get_init_creds_common(context, client, start_time, options, ctx);
1366 if (ret) {
1367 free(ctx);
1368 return ret;
1369 }
1370
1371 /* Set a new nonce. */
1372 krb5_generate_random_block (&ctx->nonce, sizeof(ctx->nonce));
1373 ctx->nonce &= 0x7fffffff;
1374 /* XXX these just needs to be the same when using Windows PK-INIT */
1375 ctx->pk_nonce = ctx->nonce;
1376
1377 ctx->prompter = prompter;
1378 ctx->prompter_data = prompter_data;
1379
1380 *rctx = ctx;
1381
1382 return ret;
1383}
1384
1385/**
1386 * Sets the service that the is requested. This call is only neede for
1387 * special initial tickets, by default the a krbtgt is fetched in the default realm.
1388 *
1389 * @param context a Kerberos 5 context.
1390 * @param ctx a krb5_init_creds_context context.
1391 * @param service the service given as a string, for example
1392 * "kadmind/admin". If NULL, the default krbtgt in the clients
1393 * realm is set.
1394 *
1395 * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
1396 * @ingroup krb5_credential
1397 */
1398
1399KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1400krb5_init_creds_set_service(krb5_context context,
1401 krb5_init_creds_context ctx,
1402 const char *service)
1403{
1404 krb5_const_realm client_realm;
1405 krb5_principal principal;
1406 krb5_error_code ret;
1407
1408 client_realm = krb5_principal_get_realm (context, ctx->cred.client);
1409
1410 if (service) {
1411 ret = krb5_parse_name (context, service, &principal);
1412 if (ret)
1413 return ret;
1414 krb5_principal_set_realm (context, principal, client_realm);
1415 } else {
1416 ret = krb5_make_principal(context, &principal,
1417 client_realm, KRB5_TGS_NAME, client_realm,
1418 NULL);
1419 if (ret)
1420 return ret;
1421 }
1422
1423 /*
1424 * This is for Windows RODC that are picky about what name type
1425 * the server principal have, and the really strange part is that
1426 * they are picky about the AS-REQ name type and not the TGS-REQ
1427 * later. Oh well.
1428 */
1429
1430 if (krb5_principal_is_krbtgt(context, principal))
1431 krb5_principal_set_type(context, principal, KRB5_NT_SRV_INST);
1432
1433 krb5_free_principal(context, ctx->cred.server);
1434 ctx->cred.server = principal;
1435
1436 return 0;
1437}
1438
1439/**
1440 * Sets the password that will use for the request.
1441 *
1442 * @param context a Kerberos 5 context.
1443 * @param ctx ctx krb5_init_creds_context context.
1444 * @param password the password to use.
1445 *
1446 * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
1447 * @ingroup krb5_credential
1448 */
1449
1450KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1451krb5_init_creds_set_password(krb5_context context,
1452 krb5_init_creds_context ctx,
1453 const char *password)
1454{
1455 if (ctx->password) {
1456 memset(ctx->password, 0, strlen(ctx->password));
1457 free(ctx->password);
1458 }
1459 if (password) {
1460 ctx->password = strdup(password);
1461 if (ctx->password == NULL) {
1462 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1463 return ENOMEM;
1464 }
1465 ctx->keyseed = (void *) ctx->password;
1466 } else {
1467 ctx->keyseed = NULL;
1468 ctx->password = NULL;
1469 }
1470
1471 return 0;
1472}
1473
1474static krb5_error_code KRB5_CALLCONV
1475keytab_key_proc(krb5_context context, krb5_enctype enctype,
1476 krb5_const_pointer keyseed,
1477 krb5_salt salt, krb5_data *s2kparms,
1478 krb5_keyblock **key)
1479{
1480 krb5_keytab_key_proc_args *args = rk_UNCONST(keyseed);
1481 krb5_keytab keytab = args->keytab;
1482 krb5_principal principal = args->principal;
1483 krb5_error_code ret;
1484 krb5_keytab real_keytab;
1485 krb5_keytab_entry entry;
1486
1487 if(keytab == NULL)
1488 krb5_kt_default(context, &real_keytab);
1489 else
1490 real_keytab = keytab;
1491
1492 ret = krb5_kt_get_entry (context, real_keytab, principal,
1493 0, enctype, &entry);
1494
1495 if (keytab == NULL)
1496 krb5_kt_close (context, real_keytab);
1497
1498 if (ret)
1499 return ret;
1500
1501 ret = krb5_copy_keyblock (context, &entry.keyblock, key);
1502 krb5_kt_free_entry(context, &entry);
1503 return ret;
1504}
1505
1506
1507/**
1508 * Set the keytab to use for authentication.
1509 *
1510 * @param context a Kerberos 5 context.
1511 * @param ctx ctx krb5_init_creds_context context.
1512 * @param keytab the keytab to read the key from.
1513 *
1514 * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
1515 * @ingroup krb5_credential
1516 */
1517
1518KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1519krb5_init_creds_set_keytab(krb5_context context,
1520 krb5_init_creds_context ctx,
1521 krb5_keytab keytab)
1522{
1523 krb5_keytab_key_proc_args *a;
1524 krb5_keytab_entry entry;
1525 krb5_kt_cursor cursor;
1526 krb5_enctype *etypes = NULL;
1527 krb5_error_code ret;
1528 size_t netypes = 0;
1529 int kvno = 0;
1530
1531 a = malloc(sizeof(*a));
1532 if (a == NULL) {
1533 krb5_set_error_message(context, ENOMEM,
1534 N_("malloc: out of memory", ""));
1535 return ENOMEM;
1536 }
1537
1538 a->principal = ctx->cred.client;
1539 a->keytab = keytab;
1540
1541 ctx->keytab_data = a;
1542 ctx->keyseed = (void *)a;
1543 ctx->keyproc = keytab_key_proc;
1544
1545 /*
1546 * We need to the KDC what enctypes we support for this keytab,
1547 * esp if the keytab is really a password based entry, then the
1548 * KDC might have more enctypes in the database then what we have
1549 * in the keytab.
1550 */
1551
1552 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1553 if(ret)
1554 goto out;
1555
1556 while(krb5_kt_next_entry(context, keytab, &entry, &cursor) == 0){
1557 void *ptr;
1558
1559 if (!krb5_principal_compare(context, entry.principal, ctx->cred.client))
1560 goto next;
1561
1562 /* check if we ahve this kvno already */
1563 if (entry.vno > kvno) {
1564 /* remove old list of etype */
1565 if (etypes)
1566 free(etypes);
1567 etypes = NULL;
1568 netypes = 0;
1569 kvno = entry.vno;
1570 } else if (entry.vno != kvno)
1571 goto next;
1572
1573 /* check if enctype is supported */
1574 if (krb5_enctype_valid(context, entry.keyblock.keytype) != 0)
1575 goto next;
1576
1577 /* add enctype to supported list */
1578 ptr = realloc(etypes, sizeof(etypes[0]) * (netypes + 2));
1579 if (ptr == NULL)
1580 goto next;
1581
1582 etypes = ptr;
1583 etypes[netypes] = entry.keyblock.keytype;
1584 etypes[netypes + 1] = ETYPE_NULL;
1585 netypes++;
1586 next:
1587 krb5_kt_free_entry(context, &entry);
1588 }
1589 krb5_kt_end_seq_get(context, keytab, &cursor);
1590
1591 if (etypes) {
1592 if (ctx->etypes)
1593 free(ctx->etypes);
1594 ctx->etypes = etypes;
1595 }
1596
1597 out:
1598 return 0;
1599}
1600
1601static krb5_error_code KRB5_CALLCONV
1602keyblock_key_proc(krb5_context context, krb5_enctype enctype,
1603 krb5_const_pointer keyseed,
1604 krb5_salt salt, krb5_data *s2kparms,
1605 krb5_keyblock **key)
1606{
1607 return krb5_copy_keyblock (context, keyseed, key);
1608}
1609
1610KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1611krb5_init_creds_set_keyblock(krb5_context context,
1612 krb5_init_creds_context ctx,
1613 krb5_keyblock *keyblock)
1614{
1615 ctx->keyseed = (void *)keyblock;
1616 ctx->keyproc = keyblock_key_proc;
1617
1618 return 0;
1619}
1620
1621/**
1622 * The core loop if krb5_get_init_creds() function family. Create the
1623 * packets and have the caller send them off to the KDC.
1624 *
1625 * If the caller want all work been done for them, use
1626 * krb5_init_creds_get() instead.
1627 *
1628 * @param context a Kerberos 5 context.
1629 * @param ctx ctx krb5_init_creds_context context.
1630 * @param in input data from KDC, first round it should be reset by krb5_data_zer().
1631 * @param out reply to KDC.
1632 * @param hostinfo KDC address info, first round it can be NULL.
1633 * @param flags status of the round, if
1634 * KRB5_INIT_CREDS_STEP_FLAG_CONTINUE is set, continue one more round.
1635 *
1636 * @return 0 for success, or an Kerberos 5 error code, see
1637 * krb5_get_error_message().
1638 *
1639 * @ingroup krb5_credential
1640 */
1641
1642KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1643krb5_init_creds_step(krb5_context context,
1644 krb5_init_creds_context ctx,
1645 krb5_data *in,
1646 krb5_data *out,
1647 krb5_krbhst_info *hostinfo,
1648 unsigned int *flags)
1649{
1650 krb5_error_code ret;
1651 size_t len = 0;
1652 size_t size;
1653
1654 krb5_data_zero(out);
1655
1656 if (ctx->as_req.req_body.cname == NULL) {
1657 ret = init_as_req(context, ctx->flags, &ctx->cred,
1658 ctx->addrs, ctx->etypes, &ctx->as_req);
1659 if (ret) {
1660 free_init_creds_ctx(context, ctx);
1661 return ret;
1662 }
1663 }
1664
1665#define MAX_PA_COUNTER 10
1666 if (ctx->pa_counter > MAX_PA_COUNTER) {
1667 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1668 N_("Looping %d times while getting "
1669 "initial credentials", ""),
1670 ctx->pa_counter);
1671 return KRB5_GET_IN_TKT_LOOP;
1672 }
1673 ctx->pa_counter++;
1674
1675 _krb5_debug(context, 5, "krb5_get_init_creds: loop %d", ctx->pa_counter);
1676
1677 /* Lets process the input packet */
1678 if (in && in->length) {
1679 krb5_kdc_rep rep;
1680
1681 memset(&rep, 0, sizeof(rep));
1682
1683 _krb5_debug(context, 5, "krb5_get_init_creds: processing input");
1684
1685 ret = decode_AS_REP(in->data, in->length, &rep.kdc_rep, &size);
1686 if (ret == 0) {
1687 krb5_keyblock *key = NULL;
1688 unsigned eflags = EXTRACT_TICKET_AS_REQ | EXTRACT_TICKET_TIMESYNC;
1689
1690 if (ctx->flags.canonicalize) {
1691 eflags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
1692 eflags |= EXTRACT_TICKET_MATCH_REALM;
1693 }
1694 if (ctx->ic_flags & KRB5_INIT_CREDS_NO_C_CANON_CHECK)
1695 eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
1696
1697 ret = process_pa_data_to_key(context, ctx, &ctx->cred,
1698 &ctx->as_req, &rep.kdc_rep, hostinfo, &key);
1699 if (ret) {
1700 free_AS_REP(&rep.kdc_rep);
1701 goto out;
1702 }
1703
1704 _krb5_debug(context, 5, "krb5_get_init_creds: extracting ticket");
1705
1706 ret = _krb5_extract_ticket(context,
1707 &rep,
1708 &ctx->cred,
1709 key,
1710 NULL,
1711 KRB5_KU_AS_REP_ENC_PART,
1712 NULL,
1713 ctx->nonce,
1714 eflags,
1715 NULL,
1716 NULL);
1717 krb5_free_keyblock(context, key);
1718
1719 *flags = 0;
1720
1721 if (ret == 0)
1722 ret = copy_EncKDCRepPart(&rep.enc_part, &ctx->enc_part);
1723
1724 free_AS_REP(&rep.kdc_rep);
1725 free_EncASRepPart(&rep.enc_part);
1726
1727 return ret;
1728
1729 } else {
1730 /* let's try to parse it as a KRB-ERROR */
1731
1732 _krb5_debug(context, 5, "krb5_get_init_creds: got an error");
1733
1734 free_KRB_ERROR(&ctx->error);
1735
1736 ret = krb5_rd_error(context, in, &ctx->error);
1737 if(ret && in->length && ((char*)in->data)[0] == 4)
1738 ret = KRB5KRB_AP_ERR_V4_REPLY;
1739 if (ret) {
1740 _krb5_debug(context, 5, "krb5_get_init_creds: failed to read error");
1741 goto out;
1742 }
1743
1744 ret = krb5_error_from_rd_error(context, &ctx->error, &ctx->cred);
1745
1746 _krb5_debug(context, 5, "krb5_get_init_creds: KRB-ERROR %d", ret);
1747
1748 /*
1749 * If no preauth was set and KDC requires it, give it one
1750 * more try.
1751 */
1752
1753 if (ret == KRB5KDC_ERR_PREAUTH_REQUIRED) {
1754
1755 free_METHOD_DATA(&ctx->md);
1756 memset(&ctx->md, 0, sizeof(ctx->md));
1757
1758 if (ctx->error.e_data) {
1759 ret = decode_METHOD_DATA(ctx->error.e_data->data,
1760 ctx->error.e_data->length,
1761 &ctx->md,
1762 NULL);
1763 if (ret)
1764 krb5_set_error_message(context, ret,
1765 N_("Failed to decode METHOD-DATA", ""));
1766 } else {
1767 krb5_set_error_message(context, ret,
1768 N_("Preauth required but no preauth "
1769 "options send by KDC", ""));
1770 }
1771 } else if (ret == KRB5KRB_AP_ERR_SKEW && context->kdc_sec_offset == 0) {
1772 /*
1773 * Try adapt to timeskrew when we are using pre-auth, and
1774 * if there was a time skew, try again.
1775 */
1776 krb5_set_real_time(context, ctx->error.stime, -1);
1777 if (context->kdc_sec_offset)
1778 ret = 0;
1779
1780 _krb5_debug(context, 10, "init_creds: err skew updateing kdc offset to %d",
1781 context->kdc_sec_offset);
1782
1783 ctx->used_pa_types = 0;
1784
1785 } else if (ret == KRB5_KDC_ERR_WRONG_REALM && ctx->flags.canonicalize) {
1786 /* client referal to a new realm */
1787
1788 if (ctx->error.crealm == NULL) {
1789 krb5_set_error_message(context, ret,
1790 N_("Got a client referral, not but no realm", ""));
1791 goto out;
1792 }
1793 _krb5_debug(context, 5,
1794 "krb5_get_init_creds: got referal to realm %s",
1795 *ctx->error.crealm);
1796
1797 ret = krb5_principal_set_realm(context,
1798 ctx->cred.client,
1799 *ctx->error.crealm);
1800
1801 ctx->used_pa_types = 0;
1802 }
1803 if (ret)
1804 goto out;
1805 }
1806 }
1807
1808 if (ctx->as_req.padata) {
1809 free_METHOD_DATA(ctx->as_req.padata);
1810 free(ctx->as_req.padata);
1811 ctx->as_req.padata = NULL;
1812 }
1813
1814 /* Set a new nonce. */
1815 ctx->as_req.req_body.nonce = ctx->nonce;
1816
1817 /* fill_in_md_data */
1818 ret = process_pa_data_to_md(context, &ctx->cred, &ctx->as_req, ctx,
1819 &ctx->md, &ctx->as_req.padata,
1820 ctx->prompter, ctx->prompter_data);
1821 if (ret)
1822 goto out;
1823
1824 krb5_data_free(&ctx->req_buffer);
1825
1826 ASN1_MALLOC_ENCODE(AS_REQ,
1827 ctx->req_buffer.data, ctx->req_buffer.length,
1828 &ctx->as_req, &len, ret);
1829 if (ret)
1830 goto out;
1831 if(len != ctx->req_buffer.length)
1832 krb5_abortx(context, "internal error in ASN.1 encoder");
1833
1834 out->data = ctx->req_buffer.data;
1835 out->length = ctx->req_buffer.length;
1836
1837 *flags = KRB5_INIT_CREDS_STEP_FLAG_CONTINUE;
1838
1839 return 0;
1840 out:
1841 return ret;
1842}
1843
1844/**
1845 * Extract the newly acquired credentials from krb5_init_creds_context
1846 * context.
1847 *
1848 * @param context A Kerberos 5 context.
1849 * @param ctx
1850 * @param cred credentials, free with krb5_free_cred_contents().
1851 *
1852 * @return 0 for sucess or An Kerberos error code, see krb5_get_error_message().
1853 */
1854
1855KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1856krb5_init_creds_get_creds(krb5_context context,
1857 krb5_init_creds_context ctx,
1858 krb5_creds *cred)
1859{
1860 return krb5_copy_creds_contents(context, &ctx->cred, cred);
1861}
1862
1863/**
1864 * Get the last error from the transaction.
1865 *
1866 * @return Returns 0 or an error code
1867 *
1868 * @ingroup krb5_credential
1869 */
1870
1871KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1872krb5_init_creds_get_error(krb5_context context,
1873 krb5_init_creds_context ctx,
1874 KRB_ERROR *error)
1875{
1876 krb5_error_code ret;
1877
1878 ret = copy_KRB_ERROR(&ctx->error, error);
1879 if (ret)
1880 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
1881
1882 return ret;
1883}
1884
1885/**
1886 * Free the krb5_init_creds_context allocated by krb5_init_creds_init().
1887 *
1888 * @param context A Kerberos 5 context.
1889 * @param ctx The krb5_init_creds_context to free.
1890 *
1891 * @ingroup krb5_credential
1892 */
1893
1894KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1895krb5_init_creds_free(krb5_context context,
1896 krb5_init_creds_context ctx)
1897{
1898 free_init_creds_ctx(context, ctx);
1899 free(ctx);
1900}
1901
1902/**
1903 * Get new credentials as setup by the krb5_init_creds_context.
1904 *
1905 * @param context A Kerberos 5 context.
1906 * @param ctx The krb5_init_creds_context to process.
1907 *
1908 * @ingroup krb5_credential
1909 */
1910
1911KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1912krb5_init_creds_get(krb5_context context, krb5_init_creds_context ctx)
1913{
1914 krb5_sendto_ctx stctx = NULL;
1915 krb5_krbhst_info *hostinfo = NULL;
1916 krb5_error_code ret;
1917 krb5_data in, out;
1918 unsigned int flags = 0;
1919
1920 krb5_data_zero(&in);
1921 krb5_data_zero(&out);
1922
1923 ret = krb5_sendto_ctx_alloc(context, &stctx);
1924 if (ret)
1925 goto out;
1926 krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
1927
1928 while (1) {
1929 flags = 0;
1930 ret = krb5_init_creds_step(context, ctx, &in, &out, hostinfo, &flags);
1931 krb5_data_free(&in);
1932 if (ret)
1933 goto out;
1934
1935 if ((flags & 1) == 0)
1936 break;
1937
1938 ret = krb5_sendto_context (context, stctx, &out,
1939 ctx->cred.client->realm, &in);
1940 if (ret)
1941 goto out;
1942
1943 }
1944
1945 out:
1946 if (stctx)
1947 krb5_sendto_ctx_free(context, stctx);
1948
1949 return ret;
1950}
1951
1952/**
1953 * Get new credentials using password.
1954 *
1955 * @ingroup krb5_credential
1956 */
1957
1958
1959KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1960krb5_get_init_creds_password(krb5_context context,
1961 krb5_creds *creds,
1962 krb5_principal client,
1963 const char *password,
1964 krb5_prompter_fct prompter,
1965 void *data,
1966 krb5_deltat start_time,
1967 const char *in_tkt_service,
1968 krb5_get_init_creds_opt *options)
1969{
1970 krb5_init_creds_context ctx;
1971 char buf[BUFSIZ];
1972 krb5_error_code ret;
1973 int chpw = 0;
1974
1975 again:
1976 ret = krb5_init_creds_init(context, client, prompter, data, start_time, options, &ctx);
1977 if (ret)
1978 goto out;
1979
1980 ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
1981 if (ret)
1982 goto out;
1983
1984 if (prompter != NULL && ctx->password == NULL && password == NULL) {
1985 krb5_prompt prompt;
1986 krb5_data password_data;
1987 char *p, *q;
1988
1989 krb5_unparse_name (context, client, &p);
1990 asprintf (&q, "%s's Password: ", p);
1991 free (p);
1992 prompt.prompt = q;
1993 password_data.data = buf;
1994 password_data.length = sizeof(buf);
1995 prompt.hidden = 1;
1996 prompt.reply = &password_data;
1997 prompt.type = KRB5_PROMPT_TYPE_PASSWORD;
1998
1999 ret = (*prompter) (context, data, NULL, NULL, 1, &prompt);
2000 free (q);
2001 if (ret) {
2002 memset (buf, 0, sizeof(buf));
2003 ret = KRB5_LIBOS_PWDINTR;
2004 krb5_clear_error_message (context);
2005 goto out;
2006 }
2007 password = password_data.data;
2008 }
2009
2010 if (password) {
2011 ret = krb5_init_creds_set_password(context, ctx, password);
2012 if (ret)
2013 goto out;
2014 }
2015
2016 ret = krb5_init_creds_get(context, ctx);
2017
2018 if (ret == 0)
2019 process_last_request(context, options, ctx);
2020
2021
2022 if (ret == KRB5KDC_ERR_KEY_EXPIRED && chpw == 0) {
2023 char buf2[1024];
2024
2025 /* try to avoid recursion */
2026 if (in_tkt_service != NULL && strcmp(in_tkt_service, "kadmin/changepw") == 0)
2027 goto out;
2028
2029 /* don't try to change password where then where none */
2030 if (prompter == NULL)
2031 goto out;
2032
2033 ret = change_password (context,
2034 client,
2035 ctx->password,
2036 buf2,
2037 sizeof(buf),
2038 prompter,
2039 data,
2040 options);
2041 if (ret)
2042 goto out;
2043 chpw = 1;
2044 krb5_init_creds_free(context, ctx);
2045 goto again;
2046 }
2047
2048 out:
2049 if (ret == 0)
2050 krb5_init_creds_get_creds(context, ctx, creds);
2051
2052 if (ctx)
2053 krb5_init_creds_free(context, ctx);
2054
2055 memset(buf, 0, sizeof(buf));
2056 return ret;
2057}
2058
2059/**
2060 * Get new credentials using keyblock.
2061 *
2062 * @ingroup krb5_credential
2063 */
2064
2065KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2066krb5_get_init_creds_keyblock(krb5_context context,
2067 krb5_creds *creds,
2068 krb5_principal client,
2069 krb5_keyblock *keyblock,
2070 krb5_deltat start_time,
2071 const char *in_tkt_service,
2072 krb5_get_init_creds_opt *options)
2073{
2074 krb5_init_creds_context ctx;
2075 krb5_error_code ret;
2076
2077 memset(creds, 0, sizeof(*creds));
2078
2079 ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
2080 if (ret)
2081 goto out;
2082
2083 ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
2084 if (ret)
2085 goto out;
2086
2087 ret = krb5_init_creds_set_keyblock(context, ctx, keyblock);
2088 if (ret)
2089 goto out;
2090
2091 ret = krb5_init_creds_get(context, ctx);
2092
2093 if (ret == 0)
2094 process_last_request(context, options, ctx);
2095
2096 out:
2097 if (ret == 0)
2098 krb5_init_creds_get_creds(context, ctx, creds);
2099
2100 if (ctx)
2101 krb5_init_creds_free(context, ctx);
2102
2103 return ret;
2104}
2105
2106/**
2107 * Get new credentials using keytab.
2108 *
2109 * @ingroup krb5_credential
2110 */
2111
2112KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2113krb5_get_init_creds_keytab(krb5_context context,
2114 krb5_creds *creds,
2115 krb5_principal client,
2116 krb5_keytab keytab,
2117 krb5_deltat start_time,
2118 const char *in_tkt_service,
2119 krb5_get_init_creds_opt *options)
2120{
2121 krb5_init_creds_context ctx;
2122 krb5_error_code ret;
2123
2124 memset(creds, 0, sizeof(*creds));
2125
2126 ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
2127 if (ret)
2128 goto out;
2129
2130 ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
2131 if (ret)
2132 goto out;
2133
2134 ret = krb5_init_creds_set_keytab(context, ctx, keytab);
2135 if (ret)
2136 goto out;
2137
2138 ret = krb5_init_creds_get(context, ctx);
2139 if (ret == 0)
2140 process_last_request(context, options, ctx);
2141
2142 out:
2143 if (ret == 0)
2144 krb5_init_creds_get_creds(context, ctx, creds);
2145
2146 if (ctx)
2147 krb5_init_creds_free(context, ctx);
2148
2149 return ret;
2150}
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