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Use reply_key from fast layer.
[heimdal.git] / lib / krb5 / init_creds_pw.c
blob8da8f7e2b56f049db096cbe281fa676964fc4d84
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
38 typedef 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 struct fast_state {
80 int flags;
81 #define KRB5_FAST_REPLY_KEY_USE_TO_ENCRYPT_THE_REPLY 1
82 #define KRB5_FAST_REPLY_KEY_USE_IN_TRANSACTION 2
83 #define KRB5_FAST_KDC_REPLY_KEY_REPLACED 4
84 #define KRB5_FAST_REPLY_REPLY_VERIFED 8
85 #define KRB5_FAST_STRONG 16
86 krb5_keyblock *reply_key;
87 };
88
89 } krb5_get_init_creds_ctx;
90
91
92 struct pa_info_data {
93 krb5_enctype etype;
94 krb5_salt salt;
95 krb5_data *s2kparams;
96 };
97
98 static void
99 free_paid(krb5_context context, struct pa_info_data *ppaid)
100 {
101 krb5_free_salt(context, ppaid->salt);
102 if (ppaid->s2kparams)
103 krb5_free_data(context, ppaid->s2kparams);
104 }
105
106 static krb5_error_code KRB5_CALLCONV
107 default_s2k_func(krb5_context context, krb5_enctype type,
108 krb5_const_pointer keyseed,
109 krb5_salt salt, krb5_data *s2kparms,
110 krb5_keyblock **key)
111 {
112 krb5_error_code ret;
113 krb5_data password;
114 krb5_data opaque;
115
116 _krb5_debug(context, 5, "krb5_get_init_creds: using default_s2k_func");
117
118 password.data = rk_UNCONST(keyseed);
119 password.length = strlen(keyseed);
120 if (s2kparms)
121 opaque = *s2kparms;
122 else
123 krb5_data_zero(&opaque);
124
125 *key = malloc(sizeof(**key));
126 if (*key == NULL)
127 return ENOMEM;
128 ret = krb5_string_to_key_data_salt_opaque(context, type, password,
129 salt, opaque, *key);
130 if (ret) {
131 free(*key);
132 *key = NULL;
133 }
134 return ret;
135 }
136
137 static void
138 free_init_creds_ctx(krb5_context context, krb5_init_creds_context ctx)
139 {
140 if (ctx->etypes)
141 free(ctx->etypes);
142 if (ctx->pre_auth_types)
143 free (ctx->pre_auth_types);
144 if (ctx->in_tkt_service)
145 free(ctx->in_tkt_service);
146 if (ctx->keytab_data)
147 free(ctx->keytab_data);
148 if (ctx->password) {
149 memset(ctx->password, 0, strlen(ctx->password));
150 free(ctx->password);
151 }
152 krb5_data_free(&ctx->req_buffer);
153 krb5_free_cred_contents(context, &ctx->cred);
154 free_METHOD_DATA(&ctx->md);
155 free_AS_REP(&ctx->as_rep);
156 free_EncKDCRepPart(&ctx->enc_part);
157 free_KRB_ERROR(&ctx->error);
158 free_AS_REQ(&ctx->as_req);
159 if (ctx->ppaid) {
160 free_paid(context, ctx->ppaid);
161 free(ctx->ppaid);
162 }
163 memset(ctx, 0, sizeof(*ctx));
164 }
165
166 static int
167 get_config_time (krb5_context context,
168 const char *realm,
169 const char *name,
170 int def)
171 {
172 int ret;
173
174 ret = krb5_config_get_time (context, NULL,
175 "realms",
176 realm,
177 name,
178 NULL);
179 if (ret >= 0)
180 return ret;
181 ret = krb5_config_get_time (context, NULL,
182 "libdefaults",
183 name,
184 NULL);
185 if (ret >= 0)
186 return ret;
187 return def;
188 }
189
190 static krb5_error_code
191 init_cred (krb5_context context,
192 krb5_creds *cred,
193 krb5_principal client,
194 krb5_deltat start_time,
195 krb5_get_init_creds_opt *options)
196 {
197 krb5_error_code ret;
198 int tmp;
199 krb5_timestamp now;
200
201 krb5_timeofday (context, &now);
202
203 memset (cred, 0, sizeof(*cred));
204
205 if (client)
206 krb5_copy_principal(context, client, &cred->client);
207 else {
208 ret = krb5_get_default_principal (context,
209 &cred->client);
210 if (ret)
211 goto out;
212 }
213
214 if (start_time)
215 cred->times.starttime = now + start_time;
216
217 if (options->flags & KRB5_GET_INIT_CREDS_OPT_TKT_LIFE)
218 tmp = options->tkt_life;
219 else
220 tmp = 10 * 60 * 60;
221 cred->times.endtime = now + tmp;
222
223 if ((options->flags & KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE) &&
224 options->renew_life > 0) {
225 cred->times.renew_till = now + options->renew_life;
226 }
227
228 return 0;
229
230 out:
231 krb5_free_cred_contents (context, cred);
232 return ret;
233 }
234
235 /*
236 * Print a message (str) to the user about the expiration in `lr'
237 */
238
239 static void
240 report_expiration (krb5_context context,
241 krb5_prompter_fct prompter,
242 krb5_data *data,
243 const char *str,
244 time_t now)
245 {
246 char *p = NULL;
247
248 if (asprintf(&p, "%s%s", str, ctime(&now)) < 0 || p == NULL)
249 return;
250 (*prompter)(context, data, NULL, p, 0, NULL);
251 free(p);
252 }
253
254 /*
255 * Check the context, and in the case there is a expiration warning,
256 * use the prompter to print the warning.
257 *
258 * @param context A Kerberos 5 context.
259 * @param options An GIC options structure
260 * @param ctx The krb5_init_creds_context check for expiration.
261 */
262
263 static krb5_error_code
264 process_last_request(krb5_context context,
265 krb5_get_init_creds_opt *options,
266 krb5_init_creds_context ctx)
267 {
268 krb5_const_realm realm;
269 LastReq *lr;
270 krb5_boolean reported = FALSE;
271 krb5_timestamp sec;
272 time_t t;
273 size_t i;
274
275 /*
276 * First check if there is a API consumer.
277 */
278
279 realm = krb5_principal_get_realm (context, ctx->cred.client);
280 lr = &ctx->enc_part.last_req;
281
282 if (options && options->opt_private && options->opt_private->lr.func) {
283 krb5_last_req_entry **lre;
284
285 lre = calloc(lr->len + 1, sizeof(**lre));
286 if (lre == NULL) {
287 krb5_set_error_message(context, ENOMEM,
288 N_("malloc: out of memory", ""));
289 return ENOMEM;
290 }
291 for (i = 0; i < lr->len; i++) {
292 lre[i] = calloc(1, sizeof(*lre[i]));
293 if (lre[i] == NULL)
294 break;
295 lre[i]->lr_type = lr->val[i].lr_type;
296 lre[i]->value = lr->val[i].lr_value;
297 }
298
299 (*options->opt_private->lr.func)(context, lre,
300 options->opt_private->lr.ctx);
301
302 for (i = 0; i < lr->len; i++)
303 free(lre[i]);
304 free(lre);
305 }
306
307 /*
308 * Now check if we should prompt the user
309 */
310
311 if (ctx->prompter == NULL)
312 return 0;
313
314 krb5_timeofday (context, &sec);
315
316 t = sec + get_config_time (context,
317 realm,
318 "warn_pwexpire",
319 7 * 24 * 60 * 60);
320
321 for (i = 0; i < lr->len; ++i) {
322 if (lr->val[i].lr_value <= t) {
323 switch (abs(lr->val[i].lr_type)) {
324 case LR_PW_EXPTIME :
325 report_expiration(context, ctx->prompter,
326 ctx->prompter_data,
327 "Your password will expire at ",
328 lr->val[i].lr_value);
329 reported = TRUE;
330 break;
331 case LR_ACCT_EXPTIME :
332 report_expiration(context, ctx->prompter,
333 ctx->prompter_data,
334 "Your account will expire at ",
335 lr->val[i].lr_value);
336 reported = TRUE;
337 break;
338 }
339 }
340 }
341
342 if (!reported
343 && ctx->enc_part.key_expiration
344 && *ctx->enc_part.key_expiration <= t) {
345 report_expiration(context, ctx->prompter,
346 ctx->prompter_data,
347 "Your password/account will expire at ",
348 *ctx->enc_part.key_expiration);
349 }
350 return 0;
351 }
352
353 static krb5_addresses no_addrs = { 0, NULL };
354
355 static krb5_error_code
356 get_init_creds_common(krb5_context context,
357 krb5_principal client,
358 krb5_deltat start_time,
359 krb5_get_init_creds_opt *options,
360 krb5_init_creds_context ctx)
361 {
362 krb5_get_init_creds_opt *default_opt = NULL;
363 krb5_error_code ret;
364 krb5_enctype *etypes;
365 krb5_preauthtype *pre_auth_types;
366
367 memset(ctx, 0, sizeof(*ctx));
368
369 if (options == NULL) {
370 const char *realm = krb5_principal_get_realm(context, client);
371
372 krb5_get_init_creds_opt_alloc (context, &default_opt);
373 options = default_opt;
374 krb5_get_init_creds_opt_set_default_flags(context, NULL, realm, options);
375 }
376
377 if (options->opt_private) {
378 if (options->opt_private->password) {
379 ret = krb5_init_creds_set_password(context, ctx,
380 options->opt_private->password);
381 if (ret)
382 goto out;
383 }
384
385 ctx->keyproc = options->opt_private->key_proc;
386 ctx->req_pac = options->opt_private->req_pac;
387 ctx->pk_init_ctx = options->opt_private->pk_init_ctx;
388 ctx->ic_flags = options->opt_private->flags;
389 } else
390 ctx->req_pac = KRB5_INIT_CREDS_TRISTATE_UNSET;
391
392 if (ctx->keyproc == NULL)
393 ctx->keyproc = default_s2k_func;
394
395 /* Enterprise name implicitly turns on canonicalize */
396 if ((ctx->ic_flags & KRB5_INIT_CREDS_CANONICALIZE) ||
397 krb5_principal_get_type(context, client) == KRB5_NT_ENTERPRISE_PRINCIPAL)
398 ctx->flags.canonicalize = 1;
399
400 ctx->pre_auth_types = NULL;
401 ctx->addrs = NULL;
402 ctx->etypes = NULL;
403 ctx->pre_auth_types = NULL;
404
405 ret = init_cred(context, &ctx->cred, client, start_time, options);
406 if (ret) {
407 if (default_opt)
408 krb5_get_init_creds_opt_free(context, default_opt);
409 return ret;
410 }
411
412 ret = krb5_init_creds_set_service(context, ctx, NULL);
413 if (ret)
414 goto out;
415
416 if (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE)
417 ctx->flags.forwardable = options->forwardable;
418
419 if (options->flags & KRB5_GET_INIT_CREDS_OPT_PROXIABLE)
420 ctx->flags.proxiable = options->proxiable;
421
422 if (start_time)
423 ctx->flags.postdated = 1;
424 if (ctx->cred.times.renew_till)
425 ctx->flags.renewable = 1;
426 if (options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST) {
427 ctx->addrs = options->address_list;
428 } else if (options->opt_private) {
429 switch (options->opt_private->addressless) {
430 case KRB5_INIT_CREDS_TRISTATE_UNSET:
431 #if KRB5_ADDRESSLESS_DEFAULT == TRUE
432 ctx->addrs = &no_addrs;
433 #else
434 ctx->addrs = NULL;
435 #endif
436 break;
437 case KRB5_INIT_CREDS_TRISTATE_FALSE:
438 ctx->addrs = NULL;
439 break;
440 case KRB5_INIT_CREDS_TRISTATE_TRUE:
441 ctx->addrs = &no_addrs;
442 break;
443 }
444 }
445 if (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST) {
446 if (ctx->etypes)
447 free(ctx->etypes);
448
449 etypes = malloc((options->etype_list_length + 1)
450 * sizeof(krb5_enctype));
451 if (etypes == NULL) {
452 ret = ENOMEM;
453 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
454 goto out;
455 }
456 memcpy (etypes, options->etype_list,
457 options->etype_list_length * sizeof(krb5_enctype));
458 etypes[options->etype_list_length] = ETYPE_NULL;
459 ctx->etypes = etypes;
460 }
461 if (options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST) {
462 pre_auth_types = malloc((options->preauth_list_length + 1)
463 * sizeof(krb5_preauthtype));
464 if (pre_auth_types == NULL) {
465 ret = ENOMEM;
466 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
467 goto out;
468 }
469 memcpy (pre_auth_types, options->preauth_list,
470 options->preauth_list_length * sizeof(krb5_preauthtype));
471 pre_auth_types[options->preauth_list_length] = KRB5_PADATA_NONE;
472 ctx->pre_auth_types = pre_auth_types;
473 }
474 if (options->flags & KRB5_GET_INIT_CREDS_OPT_ANONYMOUS)
475 ctx->flags.request_anonymous = options->anonymous;
476 if (default_opt)
477 krb5_get_init_creds_opt_free(context, default_opt);
478 return 0;
479 out:
480 if (default_opt)
481 krb5_get_init_creds_opt_free(context, default_opt);
482 return ret;
483 }
484
485 static krb5_error_code
486 change_password (krb5_context context,
487 krb5_principal client,
488 const char *password,
489 char *newpw,
490 size_t newpw_sz,
491 krb5_prompter_fct prompter,
492 void *data,
493 krb5_get_init_creds_opt *old_options)
494 {
495 krb5_prompt prompts[2];
496 krb5_error_code ret;
497 krb5_creds cpw_cred;
498 char buf1[BUFSIZ], buf2[BUFSIZ];
499 krb5_data password_data[2];
500 int result_code;
501 krb5_data result_code_string;
502 krb5_data result_string;
503 char *p;
504 krb5_get_init_creds_opt *options;
505
506 memset (&cpw_cred, 0, sizeof(cpw_cred));
507
508 ret = krb5_get_init_creds_opt_alloc(context, &options);
509 if (ret)
510 return ret;
511 krb5_get_init_creds_opt_set_tkt_life (options, 60);
512 krb5_get_init_creds_opt_set_forwardable (options, FALSE);
513 krb5_get_init_creds_opt_set_proxiable (options, FALSE);
514 if (old_options && old_options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST)
515 krb5_get_init_creds_opt_set_preauth_list (options,
516 old_options->preauth_list,
517 old_options->preauth_list_length);
518
519 krb5_data_zero (&result_code_string);
520 krb5_data_zero (&result_string);
521
522 ret = krb5_get_init_creds_password (context,
523 &cpw_cred,
524 client,
525 password,
526 prompter,
527 data,
528 0,
529 "kadmin/changepw",
530 options);
531 krb5_get_init_creds_opt_free(context, options);
532 if (ret)
533 goto out;
534
535 for(;;) {
536 password_data[0].data = buf1;
537 password_data[0].length = sizeof(buf1);
538
539 prompts[0].hidden = 1;
540 prompts[0].prompt = "New password: ";
541 prompts[0].reply = &password_data[0];
542 prompts[0].type = KRB5_PROMPT_TYPE_NEW_PASSWORD;
543
544 password_data[1].data = buf2;
545 password_data[1].length = sizeof(buf2);
546
547 prompts[1].hidden = 1;
548 prompts[1].prompt = "Repeat new password: ";
549 prompts[1].reply = &password_data[1];
550 prompts[1].type = KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN;
551
552 ret = (*prompter) (context, data, NULL, "Changing password",
553 2, prompts);
554 if (ret) {
555 memset (buf1, 0, sizeof(buf1));
556 memset (buf2, 0, sizeof(buf2));
557 goto out;
558 }
559
560 if (strcmp (buf1, buf2) == 0)
561 break;
562 memset (buf1, 0, sizeof(buf1));
563 memset (buf2, 0, sizeof(buf2));
564 }
565
566 ret = krb5_set_password (context,
567 &cpw_cred,
568 buf1,
569 client,
570 &result_code,
571 &result_code_string,
572 &result_string);
573 if (ret)
574 goto out;
575 if (asprintf(&p, "%s: %.*s\n",
576 result_code ? "Error" : "Success",
577 (int)result_string.length,
578 result_string.length > 0 ? (char*)result_string.data : "") < 0)
579 {
580 ret = ENOMEM;
581 goto out;
582 }
583
584 /* return the result */
585 (*prompter) (context, data, NULL, p, 0, NULL);
586
587 free (p);
588 if (result_code == 0) {
589 strlcpy (newpw, buf1, newpw_sz);
590 ret = 0;
591 } else {
592 ret = ENOTTY;
593 krb5_set_error_message(context, ret,
594 N_("failed changing password", ""));
595 }
596
597 out:
598 memset (buf1, 0, sizeof(buf1));
599 memset (buf2, 0, sizeof(buf2));
600 krb5_data_free (&result_string);
601 krb5_data_free (&result_code_string);
602 krb5_free_cred_contents (context, &cpw_cred);
603 return ret;
604 }
605
606
607 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
608 krb5_keyblock_key_proc (krb5_context context,
609 krb5_keytype type,
610 krb5_data *salt,
611 krb5_const_pointer keyseed,
612 krb5_keyblock **key)
613 {
614 return krb5_copy_keyblock (context, keyseed, key);
615 }
616
617 /*
618 *
619 */
620
621 static krb5_error_code
622 init_as_req (krb5_context context,
623 KDCOptions opts,
624 const krb5_creds *creds,
625 const krb5_addresses *addrs,
626 const krb5_enctype *etypes,
627 AS_REQ *a)
628 {
629 krb5_error_code ret;
630
631 memset(a, 0, sizeof(*a));
632
633 a->pvno = 5;
634 a->msg_type = krb_as_req;
635 a->req_body.kdc_options = opts;
636 a->req_body.cname = malloc(sizeof(*a->req_body.cname));
637 if (a->req_body.cname == NULL) {
638 ret = ENOMEM;
639 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
640 goto fail;
641 }
642 a->req_body.sname = malloc(sizeof(*a->req_body.sname));
643 if (a->req_body.sname == NULL) {
644 ret = ENOMEM;
645 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
646 goto fail;
647 }
648
649 ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
650 if (ret)
651 goto fail;
652 ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
653 if (ret)
654 goto fail;
655
656 ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
657 if (ret)
658 goto fail;
659
660 if(creds->times.starttime) {
661 a->req_body.from = malloc(sizeof(*a->req_body.from));
662 if (a->req_body.from == NULL) {
663 ret = ENOMEM;
664 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
665 goto fail;
666 }
667 *a->req_body.from = creds->times.starttime;
668 }
669 if(creds->times.endtime){
670 ALLOC(a->req_body.till, 1);
671 *a->req_body.till = creds->times.endtime;
672 }
673 if(creds->times.renew_till){
674 a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
675 if (a->req_body.rtime == NULL) {
676 ret = ENOMEM;
677 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
678 goto fail;
679 }
680 *a->req_body.rtime = creds->times.renew_till;
681 }
682 a->req_body.nonce = 0;
683 ret = _krb5_init_etype(context,
684 KRB5_PDU_AS_REQUEST,
685 &a->req_body.etype.len,
686 &a->req_body.etype.val,
687 etypes);
688 if (ret)
689 goto fail;
690
691 /*
692 * This means no addresses
693 */
694
695 if (addrs && addrs->len == 0) {
696 a->req_body.addresses = NULL;
697 } else {
698 a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
699 if (a->req_body.addresses == NULL) {
700 ret = ENOMEM;
701 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
702 goto fail;
703 }
704
705 if (addrs)
706 ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
707 else {
708 ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
709 if(ret == 0 && a->req_body.addresses->len == 0) {
710 free(a->req_body.addresses);
711 a->req_body.addresses = NULL;
712 }
713 }
714 if (ret)
715 goto fail;
716 }
717
718 a->req_body.enc_authorization_data = NULL;
719 a->req_body.additional_tickets = NULL;
720
721 a->padata = NULL;
722
723 return 0;
724 fail:
725 free_AS_REQ(a);
726 memset(a, 0, sizeof(*a));
727 return ret;
728 }
729
730
731 static krb5_error_code
732 set_paid(struct pa_info_data *paid, krb5_context context,
733 krb5_enctype etype,
734 krb5_salttype salttype, void *salt_string, size_t salt_len,
735 krb5_data *s2kparams)
736 {
737 paid->etype = etype;
738 paid->salt.salttype = salttype;
739 paid->salt.saltvalue.data = malloc(salt_len + 1);
740 if (paid->salt.saltvalue.data == NULL) {
741 krb5_clear_error_message(context);
742 return ENOMEM;
743 }
744 memcpy(paid->salt.saltvalue.data, salt_string, salt_len);
745 ((char *)paid->salt.saltvalue.data)[salt_len] = '\0';
746 paid->salt.saltvalue.length = salt_len;
747 if (s2kparams) {
748 krb5_error_code ret;
749
750 ret = krb5_copy_data(context, s2kparams, &paid->s2kparams);
751 if (ret) {
752 krb5_clear_error_message(context);
753 krb5_free_salt(context, paid->salt);
754 return ret;
755 }
756 } else
757 paid->s2kparams = NULL;
758
759 return 0;
760 }
761
762 static struct pa_info_data *
763 pa_etype_info2(krb5_context context,
764 const krb5_principal client,
765 const AS_REQ *asreq,
766 struct pa_info_data *paid,
767 heim_octet_string *data)
768 {
769 krb5_error_code ret;
770 ETYPE_INFO2 e;
771 size_t sz;
772 size_t i, j;
773
774 memset(&e, 0, sizeof(e));
775 ret = decode_ETYPE_INFO2(data->data, data->length, &e, &sz);
776 if (ret)
777 goto out;
778 if (e.len == 0)
779 goto out;
780 for (j = 0; j < asreq->req_body.etype.len; j++) {
781 for (i = 0; i < e.len; i++) {
782 if (asreq->req_body.etype.val[j] == e.val[i].etype) {
783 krb5_salt salt;
784 if (e.val[i].salt == NULL)
785 ret = krb5_get_pw_salt(context, client, &salt);
786 else {
787 salt.saltvalue.data = *e.val[i].salt;
788 salt.saltvalue.length = strlen(*e.val[i].salt);
789 ret = 0;
790 }
791 if (ret == 0)
792 ret = set_paid(paid, context, e.val[i].etype,
793 KRB5_PW_SALT,
794 salt.saltvalue.data,
795 salt.saltvalue.length,
796 e.val[i].s2kparams);
797 if (e.val[i].salt == NULL)
798 krb5_free_salt(context, salt);
799 if (ret == 0) {
800 free_ETYPE_INFO2(&e);
801 return paid;
802 }
803 }
804 }
805 }
806 out:
807 free_ETYPE_INFO2(&e);
808 return NULL;
809 }
810
811 static struct pa_info_data *
812 pa_etype_info(krb5_context context,
813 const krb5_principal client,
814 const AS_REQ *asreq,
815 struct pa_info_data *paid,
816 heim_octet_string *data)
817 {
818 krb5_error_code ret;
819 ETYPE_INFO e;
820 size_t sz;
821 size_t i, j;
822
823 memset(&e, 0, sizeof(e));
824 ret = decode_ETYPE_INFO(data->data, data->length, &e, &sz);
825 if (ret)
826 goto out;
827 if (e.len == 0)
828 goto out;
829 for (j = 0; j < asreq->req_body.etype.len; j++) {
830 for (i = 0; i < e.len; i++) {
831 if (asreq->req_body.etype.val[j] == e.val[i].etype) {
832 krb5_salt salt;
833 salt.salttype = KRB5_PW_SALT;
834 if (e.val[i].salt == NULL)
835 ret = krb5_get_pw_salt(context, client, &salt);
836 else {
837 salt.saltvalue = *e.val[i].salt;
838 ret = 0;
839 }
840 if (e.val[i].salttype)
841 salt.salttype = *e.val[i].salttype;
842 if (ret == 0) {
843 ret = set_paid(paid, context, e.val[i].etype,
844 salt.salttype,
845 salt.saltvalue.data,
846 salt.saltvalue.length,
847 NULL);
848 if (e.val[i].salt == NULL)
849 krb5_free_salt(context, salt);
850 }
851 if (ret == 0) {
852 free_ETYPE_INFO(&e);
853 return paid;
854 }
855 }
856 }
857 }
858 out:
859 free_ETYPE_INFO(&e);
860 return NULL;
861 }
862
863 static struct pa_info_data *
864 pa_pw_or_afs3_salt(krb5_context context,
865 const krb5_principal client,
866 const AS_REQ *asreq,
867 struct pa_info_data *paid,
868 heim_octet_string *data)
869 {
870 krb5_error_code ret;
871 if (paid->etype == KRB5_ENCTYPE_NULL)
872 return NULL;
873 ret = set_paid(paid, context,
874 paid->etype,
875 paid->salt.salttype,
876 data->data,
877 data->length,
878 NULL);
879 if (ret)
880 return NULL;
881 return paid;
882 }
883
884
885 struct pa_info {
886 krb5_preauthtype type;
887 struct pa_info_data *(*salt_info)(krb5_context,
888 const krb5_principal,
889 const AS_REQ *,
890 struct pa_info_data *,
891 heim_octet_string *);
892 };
893
894 static struct pa_info pa_prefs[] = {
895 { KRB5_PADATA_ETYPE_INFO2, pa_etype_info2 },
896 { KRB5_PADATA_ETYPE_INFO, pa_etype_info },
897 { KRB5_PADATA_PW_SALT, pa_pw_or_afs3_salt },
898 { KRB5_PADATA_AFS3_SALT, pa_pw_or_afs3_salt }
899 };
900
901 static PA_DATA *
902 find_pa_data(const METHOD_DATA *md, unsigned type)
903 {
904 size_t i;
905 if (md == NULL)
906 return NULL;
907 for (i = 0; i < md->len; i++)
908 if (md->val[i].padata_type == type)
909 return &md->val[i];
910 return NULL;
911 }
912
913 static struct pa_info_data *
914 process_pa_info(krb5_context context,
915 const krb5_principal client,
916 const AS_REQ *asreq,
917 struct pa_info_data *paid,
918 METHOD_DATA *md)
919 {
920 struct pa_info_data *p = NULL;
921 size_t i;
922
923 for (i = 0; p == NULL && i < sizeof(pa_prefs)/sizeof(pa_prefs[0]); i++) {
924 PA_DATA *pa = find_pa_data(md, pa_prefs[i].type);
925 if (pa == NULL)
926 continue;
927 paid->salt.salttype = (krb5_salttype)pa_prefs[i].type;
928 p = (*pa_prefs[i].salt_info)(context, client, asreq,
929 paid, &pa->padata_value);
930 }
931 return p;
932 }
933
934 static krb5_error_code
935 make_pa_enc_timestamp(krb5_context context, METHOD_DATA *md,
936 krb5_enctype etype, krb5_keyblock *key)
937 {
938 PA_ENC_TS_ENC p;
939 unsigned char *buf;
940 size_t buf_size;
941 size_t len = 0;
942 EncryptedData encdata;
943 krb5_error_code ret;
944 int32_t usec;
945 int usec2;
946 krb5_crypto crypto;
947
948 krb5_us_timeofday (context, &p.patimestamp, &usec);
949 usec2 = usec;
950 p.pausec = &usec2;
951
952 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
953 if (ret)
954 return ret;
955 if(buf_size != len)
956 krb5_abortx(context, "internal error in ASN.1 encoder");
957
958 ret = krb5_crypto_init(context, key, 0, &crypto);
959 if (ret) {
960 free(buf);
961 return ret;
962 }
963 ret = krb5_encrypt_EncryptedData(context,
964 crypto,
965 KRB5_KU_PA_ENC_TIMESTAMP,
966 buf,
967 len,
968 0,
969 &encdata);
970 free(buf);
971 krb5_crypto_destroy(context, crypto);
972 if (ret)
973 return ret;
974
975 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
976 free_EncryptedData(&encdata);
977 if (ret)
978 return ret;
979 if(buf_size != len)
980 krb5_abortx(context, "internal error in ASN.1 encoder");
981
982 ret = krb5_padata_add(context, md, KRB5_PADATA_ENC_TIMESTAMP, buf, len);
983 if (ret)
984 free(buf);
985 return ret;
986 }
987
988 static krb5_error_code
989 add_enc_ts_padata(krb5_context context,
990 METHOD_DATA *md,
991 krb5_principal client,
992 krb5_s2k_proc keyproc,
993 krb5_const_pointer keyseed,
994 krb5_enctype *enctypes,
995 unsigned netypes,
996 krb5_salt *salt,
997 krb5_data *s2kparams)
998 {
999 krb5_error_code ret;
1000 krb5_salt salt2;
1001 krb5_enctype *ep;
1002 size_t i;
1003
1004 if(salt == NULL) {
1005 /* default to standard salt */
1006 ret = krb5_get_pw_salt (context, client, &salt2);
1007 if (ret)
1008 return ret;
1009 salt = &salt2;
1010 }
1011 if (!enctypes) {
1012 enctypes = context->etypes;
1013 netypes = 0;
1014 for (ep = enctypes; *ep != ETYPE_NULL; ep++)
1015 netypes++;
1016 }
1017
1018 for (i = 0; i < netypes; ++i) {
1019 krb5_keyblock *key;
1020
1021 _krb5_debug(context, 5, "krb5_get_init_creds: using ENC-TS with enctype %d", enctypes[i]);
1022
1023 ret = (*keyproc)(context, enctypes[i], keyseed,
1024 *salt, s2kparams, &key);
1025 if (ret)
1026 continue;
1027 ret = make_pa_enc_timestamp (context, md, enctypes[i], key);
1028 krb5_free_keyblock (context, key);
1029 if (ret)
1030 return ret;
1031 }
1032 if(salt == &salt2)
1033 krb5_free_salt(context, salt2);
1034 return 0;
1035 }
1036
1037 static krb5_error_code
1038 pa_data_to_md_ts_enc(krb5_context context,
1039 const AS_REQ *a,
1040 const krb5_principal client,
1041 krb5_get_init_creds_ctx *ctx,
1042 struct pa_info_data *ppaid,
1043 METHOD_DATA *md)
1044 {
1045 if (ctx->keyproc == NULL || ctx->keyseed == NULL)
1046 return 0;
1047
1048 if (ppaid) {
1049 add_enc_ts_padata(context, md, client,
1050 ctx->keyproc, ctx->keyseed,
1051 &ppaid->etype, 1,
1052 &ppaid->salt, ppaid->s2kparams);
1053 } else {
1054 krb5_salt salt;
1055
1056 _krb5_debug(context, 5, "krb5_get_init_creds: pa-info not found, guessing salt");
1057
1058 /* make a v5 salted pa-data */
1059 add_enc_ts_padata(context, md, client,
1060 ctx->keyproc, ctx->keyseed,
1061 a->req_body.etype.val, a->req_body.etype.len,
1062 NULL, NULL);
1063
1064 /* make a v4 salted pa-data */
1065 salt.salttype = KRB5_PW_SALT;
1066 krb5_data_zero(&salt.saltvalue);
1067 add_enc_ts_padata(context, md, client,
1068 ctx->keyproc, ctx->keyseed,
1069 a->req_body.etype.val, a->req_body.etype.len,
1070 &salt, NULL);
1071 }
1072 return 0;
1073 }
1074
1075 static krb5_error_code
1076 pa_data_to_key_plain(krb5_context context,
1077 const krb5_principal client,
1078 krb5_get_init_creds_ctx *ctx,
1079 krb5_salt salt,
1080 krb5_data *s2kparams,
1081 krb5_enctype etype,
1082 krb5_keyblock **key)
1083 {
1084 krb5_error_code ret;
1085
1086 ret = (*ctx->keyproc)(context, etype, ctx->keyseed,
1087 salt, s2kparams, key);
1088 return ret;
1089 }
1090
1091
1092 static krb5_error_code
1093 pa_data_to_md_pkinit(krb5_context context,
1094 const AS_REQ *a,
1095 const krb5_principal client,
1096 int win2k,
1097 krb5_get_init_creds_ctx *ctx,
1098 METHOD_DATA *md)
1099 {
1100 if (ctx->pk_init_ctx == NULL)
1101 return 0;
1102 #ifdef PKINIT
1103 return _krb5_pk_mk_padata(context,
1104 ctx->pk_init_ctx,
1105 ctx->ic_flags,
1106 win2k,
1107 &a->req_body,
1108 ctx->pk_nonce,
1109 md);
1110 #else
1111 krb5_set_error_message(context, EINVAL,
1112 N_("no support for PKINIT compiled in", ""));
1113 return EINVAL;
1114 #endif
1115 }
1116
1117 static krb5_error_code
1118 pa_data_add_pac_request(krb5_context context,
1119 krb5_get_init_creds_ctx *ctx,
1120 METHOD_DATA *md)
1121 {
1122 size_t len = 0, length;
1123 krb5_error_code ret;
1124 PA_PAC_REQUEST req;
1125 void *buf;
1126
1127 switch (ctx->req_pac) {
1128 case KRB5_INIT_CREDS_TRISTATE_UNSET:
1129 return 0; /* don't bother */
1130 case KRB5_INIT_CREDS_TRISTATE_TRUE:
1131 req.include_pac = 1;
1132 break;
1133 case KRB5_INIT_CREDS_TRISTATE_FALSE:
1134 req.include_pac = 0;
1135 }
1136
1137 ASN1_MALLOC_ENCODE(PA_PAC_REQUEST, buf, length,
1138 &req, &len, ret);
1139 if (ret)
1140 return ret;
1141 if(len != length)
1142 krb5_abortx(context, "internal error in ASN.1 encoder");
1143
1144 ret = krb5_padata_add(context, md, KRB5_PADATA_PA_PAC_REQUEST, buf, len);
1145 if (ret)
1146 free(buf);
1147
1148 return 0;
1149 }
1150
1151 /*
1152 * Assumes caller always will free `out_md', even on error.
1153 */
1154
1155 static krb5_error_code
1156 process_pa_data_to_md(krb5_context context,
1157 const krb5_creds *creds,
1158 const AS_REQ *a,
1159 krb5_get_init_creds_ctx *ctx,
1160 METHOD_DATA *in_md,
1161 METHOD_DATA **out_md,
1162 krb5_prompter_fct prompter,
1163 void *prompter_data)
1164 {
1165 krb5_error_code ret;
1166
1167 ALLOC(*out_md, 1);
1168 if (*out_md == NULL) {
1169 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1170 return ENOMEM;
1171 }
1172 (*out_md)->len = 0;
1173 (*out_md)->val = NULL;
1174
1175 if (_krb5_have_debug(context, 5)) {
1176 unsigned i;
1177 _krb5_debug(context, 5, "KDC send %d patypes", in_md->len);
1178 for (i = 0; i < in_md->len; i++)
1179 _krb5_debug(context, 5, "KDC send PA-DATA type: %d", in_md->val[i].padata_type);
1180 }
1181
1182 /*
1183 * Make sure we don't sent both ENC-TS and PK-INIT pa data, no
1184 * need to expose our password protecting our PKCS12 key.
1185 */
1186
1187 if (ctx->pk_init_ctx) {
1188
1189 _krb5_debug(context, 5, "krb5_get_init_creds: "
1190 "prepareing PKINIT padata (%s)",
1191 (ctx->used_pa_types & USED_PKINIT_W2K) ? "win2k" : "ietf");
1192
1193 if (ctx->used_pa_types & USED_PKINIT_W2K) {
1194 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1195 "Already tried pkinit, looping");
1196 return KRB5_GET_IN_TKT_LOOP;
1197 }
1198
1199 ret = pa_data_to_md_pkinit(context, a, creds->client,
1200 (ctx->used_pa_types & USED_PKINIT),
1201 ctx, *out_md);
1202 if (ret)
1203 return ret;
1204
1205 if (ctx->used_pa_types & USED_PKINIT)
1206 ctx->used_pa_types |= USED_PKINIT_W2K;
1207 else
1208 ctx->used_pa_types |= USED_PKINIT;
1209
1210 } else if (in_md->len != 0) {
1211 struct pa_info_data *paid, *ppaid;
1212 unsigned flag;
1213
1214 paid = calloc(1, sizeof(*paid));
1215
1216 paid->etype = KRB5_ENCTYPE_NULL;
1217 ppaid = process_pa_info(context, creds->client, a, paid, in_md);
1218
1219 if (ppaid)
1220 flag = USED_ENC_TS_INFO;
1221 else
1222 flag = USED_ENC_TS_GUESS;
1223
1224 if (ctx->used_pa_types & flag) {
1225 if (ppaid)
1226 free_paid(context, ppaid);
1227 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1228 "Already tried ENC-TS-%s, looping",
1229 flag == USED_ENC_TS_INFO ? "info" : "guess");
1230 return KRB5_GET_IN_TKT_LOOP;
1231 }
1232
1233 pa_data_to_md_ts_enc(context, a, creds->client, ctx, ppaid, *out_md);
1234
1235 ctx->used_pa_types |= flag;
1236
1237 if (ppaid) {
1238 if (ctx->ppaid) {
1239 free_paid(context, ctx->ppaid);
1240 free(ctx->ppaid);
1241 }
1242 ctx->ppaid = ppaid;
1243 } else
1244 free(paid);
1245 }
1246
1247 pa_data_add_pac_request(context, ctx, *out_md);
1248
1249 if ((*out_md)->len == 0) {
1250 free(*out_md);
1251 *out_md = NULL;
1252 }
1253
1254 return 0;
1255 }
1256
1257 static krb5_error_code
1258 process_pa_data_to_key(krb5_context context,
1259 krb5_get_init_creds_ctx *ctx,
1260 krb5_creds *creds,
1261 AS_REQ *a,
1262 AS_REP *rep,
1263 const krb5_krbhst_info *hi,
1264 krb5_keyblock **key)
1265 {
1266 struct pa_info_data paid, *ppaid = NULL;
1267 krb5_error_code ret;
1268 krb5_enctype etype;
1269 PA_DATA *pa;
1270
1271 memset(&paid, 0, sizeof(paid));
1272
1273 etype = rep->enc_part.etype;
1274
1275 if (rep->padata) {
1276 paid.etype = etype;
1277 ppaid = process_pa_info(context, creds->client, a, &paid,
1278 rep->padata);
1279 }
1280 if (ppaid == NULL)
1281 ppaid = ctx->ppaid;
1282 if (ppaid == NULL) {
1283 ret = krb5_get_pw_salt (context, creds->client, &paid.salt);
1284 if (ret)
1285 return ret;
1286 paid.etype = etype;
1287 paid.s2kparams = NULL;
1288 ppaid = &paid;
1289 }
1290
1291 pa = NULL;
1292 if (rep->padata) {
1293 int idx = 0;
1294 pa = krb5_find_padata(rep->padata->val,
1295 rep->padata->len,
1296 KRB5_PADATA_PK_AS_REP,
1297 &idx);
1298 if (pa == NULL) {
1299 idx = 0;
1300 pa = krb5_find_padata(rep->padata->val,
1301 rep->padata->len,
1302 KRB5_PADATA_PK_AS_REP_19,
1303 &idx);
1304 }
1305 }
1306 if (pa && ctx->pk_init_ctx) {
1307 #ifdef PKINIT
1308 _krb5_debug(context, 5, "krb5_get_init_creds: using PKINIT");
1309
1310 ret = _krb5_pk_rd_pa_reply(context,
1311 a->req_body.realm,
1312 ctx->pk_init_ctx,
1313 etype,
1314 hi,
1315 ctx->pk_nonce,
1316 &ctx->req_buffer,
1317 pa,
1318 key);
1319 #else
1320 ret = EINVAL;
1321 krb5_set_error_message(context, ret, N_("no support for PKINIT compiled in", ""));
1322 #endif
1323 } else if (ctx->keyseed) {
1324 _krb5_debug(context, 5, "krb5_get_init_creds: using keyproc");
1325 ret = pa_data_to_key_plain(context, creds->client, ctx,
1326 ppaid->salt, ppaid->s2kparams, etype, key);
1327 } else {
1328 ret = EINVAL;
1329 krb5_set_error_message(context, ret, N_("No usable pa data type", ""));
1330 }
1331
1332 free_paid(context, &paid);
1333 return ret;
1334 }
1335
1336 /**
1337 * Start a new context to get a new initial credential.
1338 *
1339 * @param context A Kerberos 5 context.
1340 * @param client The Kerberos principal to get the credential for, if
1341 * NULL is given, the default principal is used as determined by
1342 * krb5_get_default_principal().
1343 * @param prompter
1344 * @param prompter_data
1345 * @param start_time the time the ticket should start to be valid or 0 for now.
1346 * @param options a options structure, can be NULL for default options.
1347 * @param rctx A new allocated free with krb5_init_creds_free().
1348 *
1349 * @return 0 for success or an Kerberos 5 error code, see krb5_get_error_message().
1350 *
1351 * @ingroup krb5_credential
1352 */
1353
1354 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1355 krb5_init_creds_init(krb5_context context,
1356 krb5_principal client,
1357 krb5_prompter_fct prompter,
1358 void *prompter_data,
1359 krb5_deltat start_time,
1360 krb5_get_init_creds_opt *options,
1361 krb5_init_creds_context *rctx)
1362 {
1363 krb5_init_creds_context ctx;
1364 krb5_error_code ret;
1365
1366 *rctx = NULL;
1367
1368 ctx = calloc(1, sizeof(*ctx));
1369 if (ctx == NULL) {
1370 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1371 return ENOMEM;
1372 }
1373
1374 ret = get_init_creds_common(context, client, start_time, options, ctx);
1375 if (ret) {
1376 free(ctx);
1377 return ret;
1378 }
1379
1380 /* Set a new nonce. */
1381 krb5_generate_random_block (&ctx->nonce, sizeof(ctx->nonce));
1382 ctx->nonce &= 0x7fffffff;
1383 /* XXX these just needs to be the same when using Windows PK-INIT */
1384 ctx->pk_nonce = ctx->nonce;
1385
1386 ctx->prompter = prompter;
1387 ctx->prompter_data = prompter_data;
1388
1389 *rctx = ctx;
1390
1391 return ret;
1392 }
1393
1394 /**
1395 * Sets the service that the is requested. This call is only neede for
1396 * special initial tickets, by default the a krbtgt is fetched in the default realm.
1397 *
1398 * @param context a Kerberos 5 context.
1399 * @param ctx a krb5_init_creds_context context.
1400 * @param service the service given as a string, for example
1401 * "kadmind/admin". If NULL, the default krbtgt in the clients
1402 * realm is set.
1403 *
1404 * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
1405 * @ingroup krb5_credential
1406 */
1407
1408 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1409 krb5_init_creds_set_service(krb5_context context,
1410 krb5_init_creds_context ctx,
1411 const char *service)
1412 {
1413 krb5_const_realm client_realm;
1414 krb5_principal principal;
1415 krb5_error_code ret;
1416
1417 client_realm = krb5_principal_get_realm (context, ctx->cred.client);
1418
1419 if (service) {
1420 ret = krb5_parse_name (context, service, &principal);
1421 if (ret)
1422 return ret;
1423 krb5_principal_set_realm (context, principal, client_realm);
1424 } else {
1425 ret = krb5_make_principal(context, &principal,
1426 client_realm, KRB5_TGS_NAME, client_realm,
1427 NULL);
1428 if (ret)
1429 return ret;
1430 }
1431
1432 /*
1433 * This is for Windows RODC that are picky about what name type
1434 * the server principal have, and the really strange part is that
1435 * they are picky about the AS-REQ name type and not the TGS-REQ
1436 * later. Oh well.
1437 */
1438
1439 if (krb5_principal_is_krbtgt(context, principal))
1440 krb5_principal_set_type(context, principal, KRB5_NT_SRV_INST);
1441
1442 krb5_free_principal(context, ctx->cred.server);
1443 ctx->cred.server = principal;
1444
1445 return 0;
1446 }
1447
1448 /**
1449 * Sets the password that will use for the request.
1450 *
1451 * @param context a Kerberos 5 context.
1452 * @param ctx ctx krb5_init_creds_context context.
1453 * @param password the password to use.
1454 *
1455 * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
1456 * @ingroup krb5_credential
1457 */
1458
1459 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1460 krb5_init_creds_set_password(krb5_context context,
1461 krb5_init_creds_context ctx,
1462 const char *password)
1463 {
1464 if (ctx->password) {
1465 memset(ctx->password, 0, strlen(ctx->password));
1466 free(ctx->password);
1467 }
1468 if (password) {
1469 ctx->password = strdup(password);
1470 if (ctx->password == NULL) {
1471 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1472 return ENOMEM;
1473 }
1474 ctx->keyseed = (void *) ctx->password;
1475 } else {
1476 ctx->keyseed = NULL;
1477 ctx->password = NULL;
1478 }
1479
1480 return 0;
1481 }
1482
1483 static krb5_error_code KRB5_CALLCONV
1484 keytab_key_proc(krb5_context context, krb5_enctype enctype,
1485 krb5_const_pointer keyseed,
1486 krb5_salt salt, krb5_data *s2kparms,
1487 krb5_keyblock **key)
1488 {
1489 krb5_keytab_key_proc_args *args = rk_UNCONST(keyseed);
1490 krb5_keytab keytab = args->keytab;
1491 krb5_principal principal = args->principal;
1492 krb5_error_code ret;
1493 krb5_keytab real_keytab;
1494 krb5_keytab_entry entry;
1495
1496 if(keytab == NULL)
1497 krb5_kt_default(context, &real_keytab);
1498 else
1499 real_keytab = keytab;
1500
1501 ret = krb5_kt_get_entry (context, real_keytab, principal,
1502 0, enctype, &entry);
1503
1504 if (keytab == NULL)
1505 krb5_kt_close (context, real_keytab);
1506
1507 if (ret)
1508 return ret;
1509
1510 ret = krb5_copy_keyblock (context, &entry.keyblock, key);
1511 krb5_kt_free_entry(context, &entry);
1512 return ret;
1513 }
1514
1515
1516 /**
1517 * Set the keytab to use for authentication.
1518 *
1519 * @param context a Kerberos 5 context.
1520 * @param ctx ctx krb5_init_creds_context context.
1521 * @param keytab the keytab to read the key from.
1522 *
1523 * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
1524 * @ingroup krb5_credential
1525 */
1526
1527 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1528 krb5_init_creds_set_keytab(krb5_context context,
1529 krb5_init_creds_context ctx,
1530 krb5_keytab keytab)
1531 {
1532 krb5_keytab_key_proc_args *a;
1533 krb5_keytab_entry entry;
1534 krb5_kt_cursor cursor;
1535 krb5_enctype *etypes = NULL;
1536 krb5_error_code ret;
1537 size_t netypes = 0;
1538 int kvno = 0;
1539
1540 a = malloc(sizeof(*a));
1541 if (a == NULL) {
1542 krb5_set_error_message(context, ENOMEM,
1543 N_("malloc: out of memory", ""));
1544 return ENOMEM;
1545 }
1546
1547 a->principal = ctx->cred.client;
1548 a->keytab = keytab;
1549
1550 ctx->keytab_data = a;
1551 ctx->keyseed = (void *)a;
1552 ctx->keyproc = keytab_key_proc;
1553
1554 /*
1555 * We need to the KDC what enctypes we support for this keytab,
1556 * esp if the keytab is really a password based entry, then the
1557 * KDC might have more enctypes in the database then what we have
1558 * in the keytab.
1559 */
1560
1561 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1562 if(ret)
1563 goto out;
1564
1565 while(krb5_kt_next_entry(context, keytab, &entry, &cursor) == 0){
1566 void *ptr;
1567
1568 if (!krb5_principal_compare(context, entry.principal, ctx->cred.client))
1569 goto next;
1570
1571 /* check if we ahve this kvno already */
1572 if (entry.vno > kvno) {
1573 /* remove old list of etype */
1574 if (etypes)
1575 free(etypes);
1576 etypes = NULL;
1577 netypes = 0;
1578 kvno = entry.vno;
1579 } else if (entry.vno != kvno)
1580 goto next;
1581
1582 /* check if enctype is supported */
1583 if (krb5_enctype_valid(context, entry.keyblock.keytype) != 0)
1584 goto next;
1585
1586 /* add enctype to supported list */
1587 ptr = realloc(etypes, sizeof(etypes[0]) * (netypes + 2));
1588 if (ptr == NULL)
1589 goto next;
1590
1591 etypes = ptr;
1592 etypes[netypes] = entry.keyblock.keytype;
1593 etypes[netypes + 1] = ETYPE_NULL;
1594 netypes++;
1595 next:
1596 krb5_kt_free_entry(context, &entry);
1597 }
1598 krb5_kt_end_seq_get(context, keytab, &cursor);
1599
1600 if (etypes) {
1601 if (ctx->etypes)
1602 free(ctx->etypes);
1603 ctx->etypes = etypes;
1604 }
1605
1606 out:
1607 return 0;
1608 }
1609
1610 static krb5_error_code KRB5_CALLCONV
1611 keyblock_key_proc(krb5_context context, krb5_enctype enctype,
1612 krb5_const_pointer keyseed,
1613 krb5_salt salt, krb5_data *s2kparms,
1614 krb5_keyblock **key)
1615 {
1616 return krb5_copy_keyblock (context, keyseed, key);
1617 }
1618
1619 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1620 krb5_init_creds_set_keyblock(krb5_context context,
1621 krb5_init_creds_context ctx,
1622 krb5_keyblock *keyblock)
1623 {
1624 ctx->keyseed = (void *)keyblock;
1625 ctx->keyproc = keyblock_key_proc;
1626
1627 return 0;
1628 }
1629
1630 /**
1631 * The core loop if krb5_get_init_creds() function family. Create the
1632 * packets and have the caller send them off to the KDC.
1633 *
1634 * If the caller want all work been done for them, use
1635 * krb5_init_creds_get() instead.
1636 *
1637 * @param context a Kerberos 5 context.
1638 * @param ctx ctx krb5_init_creds_context context.
1639 * @param in input data from KDC, first round it should be reset by krb5_data_zer().
1640 * @param out reply to KDC.
1641 * @param hostinfo KDC address info, first round it can be NULL.
1642 * @param flags status of the round, if
1643 * KRB5_INIT_CREDS_STEP_FLAG_CONTINUE is set, continue one more round.
1644 *
1645 * @return 0 for success, or an Kerberos 5 error code, see
1646 * krb5_get_error_message().
1647 *
1648 * @ingroup krb5_credential
1649 */
1650
1651 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1652 krb5_init_creds_step(krb5_context context,
1653 krb5_init_creds_context ctx,
1654 krb5_data *in,
1655 krb5_data *out,
1656 krb5_krbhst_info *hostinfo,
1657 unsigned int *flags)
1658 {
1659 krb5_error_code ret;
1660 size_t len = 0;
1661 size_t size;
1662
1663 krb5_data_zero(out);
1664
1665 if (ctx->as_req.req_body.cname == NULL) {
1666 ret = init_as_req(context, ctx->flags, &ctx->cred,
1667 ctx->addrs, ctx->etypes, &ctx->as_req);
1668 if (ret) {
1669 free_init_creds_ctx(context, ctx);
1670 return ret;
1671 }
1672 }
1673
1674 #define MAX_PA_COUNTER 10
1675 if (ctx->pa_counter > MAX_PA_COUNTER) {
1676 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1677 N_("Looping %d times while getting "
1678 "initial credentials", ""),
1679 ctx->pa_counter);
1680 return KRB5_GET_IN_TKT_LOOP;
1681 }
1682 ctx->pa_counter++;
1683
1684 _krb5_debug(context, 5, "krb5_get_init_creds: loop %d", ctx->pa_counter);
1685
1686 /* Lets process the input packet */
1687 if (in && in->length) {
1688 krb5_kdc_rep rep;
1689
1690 memset(&rep, 0, sizeof(rep));
1691
1692 _krb5_debug(context, 5, "krb5_get_init_creds: processing input");
1693
1694 ret = decode_AS_REP(in->data, in->length, &rep.kdc_rep, &size);
1695 if (ret == 0) {
1696 krb5_keyblock *key = NULL;
1697 unsigned eflags = EXTRACT_TICKET_AS_REQ | EXTRACT_TICKET_TIMESYNC;
1698
1699 if (ctx->flags.canonicalize) {
1700 eflags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
1701 eflags |= EXTRACT_TICKET_MATCH_REALM;
1702 }
1703 if (ctx->ic_flags & KRB5_INIT_CREDS_NO_C_CANON_CHECK)
1704 eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
1705
1706 ret = process_pa_data_to_key(context, ctx, &ctx->cred,
1707 &ctx->as_req, &rep.kdc_rep,
1708 hostinfo, &ctx->reply_key);
1709 if (ret) {
1710 free_AS_REP(&rep.kdc_rep);
1711 goto out;
1712 }
1713
1714 _krb5_debug(context, 5, "krb5_get_init_creds: extracting ticket");
1715
1716 ret = _krb5_extract_ticket(context,
1717 &rep,
1718 &ctx->cred,
1719 ctx->reply_key,
1720 NULL,
1721 KRB5_KU_AS_REP_ENC_PART,
1722 NULL,
1723 ctx->nonce,
1724 eflags,
1725 NULL,
1726 NULL);
1727 krb5_free_keyblock(context, ctx->reply_key);
1728 ctx->reply_key = NULL;
1729 *flags = 0;
1730
1731 if (ret == 0)
1732 ret = copy_EncKDCRepPart(&rep.enc_part, &ctx->enc_part);
1733
1734 free_AS_REP(&rep.kdc_rep);
1735 free_EncASRepPart(&rep.enc_part);
1736
1737 return ret;
1738
1739 } else {
1740 /* let's try to parse it as a KRB-ERROR */
1741
1742 _krb5_debug(context, 5, "krb5_get_init_creds: got an error");
1743
1744 free_KRB_ERROR(&ctx->error);
1745
1746 ret = krb5_rd_error(context, in, &ctx->error);
1747 if(ret && in->length && ((char*)in->data)[0] == 4)
1748 ret = KRB5KRB_AP_ERR_V4_REPLY;
1749 if (ret) {
1750 _krb5_debug(context, 5, "krb5_get_init_creds: failed to read error");
1751 goto out;
1752 }
1753
1754 ret = krb5_error_from_rd_error(context, &ctx->error, &ctx->cred);
1755
1756 _krb5_debug(context, 5, "krb5_get_init_creds: KRB-ERROR %d", ret);
1757
1758 /*
1759 * If no preauth was set and KDC requires it, give it one
1760 * more try.
1761 */
1762
1763 if (ret == KRB5KDC_ERR_PREAUTH_REQUIRED) {
1764
1765 free_METHOD_DATA(&ctx->md);
1766 memset(&ctx->md, 0, sizeof(ctx->md));
1767
1768 if (ctx->error.e_data) {
1769 ret = decode_METHOD_DATA(ctx->error.e_data->data,
1770 ctx->error.e_data->length,
1771 &ctx->md,
1772 NULL);
1773 if (ret)
1774 krb5_set_error_message(context, ret,
1775 N_("Failed to decode METHOD-DATA", ""));
1776 } else {
1777 krb5_set_error_message(context, ret,
1778 N_("Preauth required but no preauth "
1779 "options send by KDC", ""));
1780 }
1781 } else if (ret == KRB5KRB_AP_ERR_SKEW && context->kdc_sec_offset == 0) {
1782 /*
1783 * Try adapt to timeskrew when we are using pre-auth, and
1784 * if there was a time skew, try again.
1785 */
1786 krb5_set_real_time(context, ctx->error.stime, -1);
1787 if (context->kdc_sec_offset)
1788 ret = 0;
1789
1790 _krb5_debug(context, 10, "init_creds: err skew updateing kdc offset to %d",
1791 context->kdc_sec_offset);
1792
1793 ctx->used_pa_types = 0;
1794
1795 } else if (ret == KRB5_KDC_ERR_WRONG_REALM && ctx->flags.canonicalize) {
1796 /* client referal to a new realm */
1797
1798 if (ctx->error.crealm == NULL) {
1799 krb5_set_error_message(context, ret,
1800 N_("Got a client referral, not but no realm", ""));
1801 goto out;
1802 }
1803 _krb5_debug(context, 5,
1804 "krb5_get_init_creds: got referal to realm %s",
1805 *ctx->error.crealm);
1806
1807 ret = krb5_principal_set_realm(context,
1808 ctx->cred.client,
1809 *ctx->error.crealm);
1810
1811 ctx->used_pa_types = 0;
1812 }
1813 if (ret)
1814 goto out;
1815 }
1816 }
1817
1818 if (ctx->as_req.padata) {
1819 free_METHOD_DATA(ctx->as_req.padata);
1820 free(ctx->as_req.padata);
1821 ctx->as_req.padata = NULL;
1822 }
1823
1824 /* Set a new nonce. */
1825 ctx->as_req.req_body.nonce = ctx->nonce;
1826
1827 /* fill_in_md_data */
1828 ret = process_pa_data_to_md(context, &ctx->cred, &ctx->as_req, ctx,
1829 &ctx->md, &ctx->as_req.padata,
1830 ctx->prompter, ctx->prompter_data);
1831 if (ret)
1832 goto out;
1833
1834 krb5_data_free(&ctx->req_buffer);
1835
1836 ASN1_MALLOC_ENCODE(AS_REQ,
1837 ctx->req_buffer.data, ctx->req_buffer.length,
1838 &ctx->as_req, &len, ret);
1839 if (ret)
1840 goto out;
1841 if(len != ctx->req_buffer.length)
1842 krb5_abortx(context, "internal error in ASN.1 encoder");
1843
1844 out->data = ctx->req_buffer.data;
1845 out->length = ctx->req_buffer.length;
1846
1847 *flags = KRB5_INIT_CREDS_STEP_FLAG_CONTINUE;
1848
1849 return 0;
1850 out:
1851 return ret;
1852 }
1853
1854 /**
1855 * Extract the newly acquired credentials from krb5_init_creds_context
1856 * context.
1857 *
1858 * @param context A Kerberos 5 context.
1859 * @param ctx
1860 * @param cred credentials, free with krb5_free_cred_contents().
1861 *
1862 * @return 0 for sucess or An Kerberos error code, see krb5_get_error_message().
1863 */
1864
1865 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1866 krb5_init_creds_get_creds(krb5_context context,
1867 krb5_init_creds_context ctx,
1868 krb5_creds *cred)
1869 {
1870 return krb5_copy_creds_contents(context, &ctx->cred, cred);
1871 }
1872
1873 /**
1874 * Get the last error from the transaction.
1875 *
1876 * @return Returns 0 or an error code
1877 *
1878 * @ingroup krb5_credential
1879 */
1880
1881 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1882 krb5_init_creds_get_error(krb5_context context,
1883 krb5_init_creds_context ctx,
1884 KRB_ERROR *error)
1885 {
1886 krb5_error_code ret;
1887
1888 ret = copy_KRB_ERROR(&ctx->error, error);
1889 if (ret)
1890 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
1891
1892 return ret;
1893 }
1894
1895 /**
1896 * Free the krb5_init_creds_context allocated by krb5_init_creds_init().
1897 *
1898 * @param context A Kerberos 5 context.
1899 * @param ctx The krb5_init_creds_context to free.
1900 *
1901 * @ingroup krb5_credential
1902 */
1903
1904 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1905 krb5_init_creds_free(krb5_context context,
1906 krb5_init_creds_context ctx)
1907 {
1908 free_init_creds_ctx(context, ctx);
1909 free(ctx);
1910 }
1911
1912 /**
1913 * Get new credentials as setup by the krb5_init_creds_context.
1914 *
1915 * @param context A Kerberos 5 context.
1916 * @param ctx The krb5_init_creds_context to process.
1917 *
1918 * @ingroup krb5_credential
1919 */
1920
1921 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1922 krb5_init_creds_get(krb5_context context, krb5_init_creds_context ctx)
1923 {
1924 krb5_sendto_ctx stctx = NULL;
1925 krb5_krbhst_info *hostinfo = NULL;
1926 krb5_error_code ret;
1927 krb5_data in, out;
1928 unsigned int flags = 0;
1929
1930 krb5_data_zero(&in);
1931 krb5_data_zero(&out);
1932
1933 ret = krb5_sendto_ctx_alloc(context, &stctx);
1934 if (ret)
1935 goto out;
1936 krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
1937
1938 while (1) {
1939 flags = 0;
1940 ret = krb5_init_creds_step(context, ctx, &in, &out, hostinfo, &flags);
1941 krb5_data_free(&in);
1942 if (ret)
1943 goto out;
1944
1945 if ((flags & 1) == 0)
1946 break;
1947
1948 ret = krb5_sendto_context (context, stctx, &out,
1949 ctx->cred.client->realm, &in);
1950 if (ret)
1951 goto out;
1952
1953 }
1954
1955 out:
1956 if (stctx)
1957 krb5_sendto_ctx_free(context, stctx);
1958
1959 return ret;
1960 }
1961
1962 /**
1963 * Get new credentials using password.
1964 *
1965 * @ingroup krb5_credential
1966 */
1967
1968
1969 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1970 krb5_get_init_creds_password(krb5_context context,
1971 krb5_creds *creds,
1972 krb5_principal client,
1973 const char *password,
1974 krb5_prompter_fct prompter,
1975 void *data,
1976 krb5_deltat start_time,
1977 const char *in_tkt_service,
1978 krb5_get_init_creds_opt *options)
1979 {
1980 krb5_init_creds_context ctx;
1981 char buf[BUFSIZ];
1982 krb5_error_code ret;
1983 int chpw = 0;
1984
1985 again:
1986 ret = krb5_init_creds_init(context, client, prompter, data, start_time, options, &ctx);
1987 if (ret)
1988 goto out;
1989
1990 ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
1991 if (ret)
1992 goto out;
1993
1994 if (prompter != NULL && ctx->password == NULL && password == NULL) {
1995 krb5_prompt prompt;
1996 krb5_data password_data;
1997 char *p, *q;
1998
1999 krb5_unparse_name (context, client, &p);
2000 asprintf (&q, "%s's Password: ", p);
2001 free (p);
2002 prompt.prompt = q;
2003 password_data.data = buf;
2004 password_data.length = sizeof(buf);
2005 prompt.hidden = 1;
2006 prompt.reply = &password_data;
2007 prompt.type = KRB5_PROMPT_TYPE_PASSWORD;
2008
2009 ret = (*prompter) (context, data, NULL, NULL, 1, &prompt);
2010 free (q);
2011 if (ret) {
2012 memset (buf, 0, sizeof(buf));
2013 ret = KRB5_LIBOS_PWDINTR;
2014 krb5_clear_error_message (context);
2015 goto out;
2016 }
2017 password = password_data.data;
2018 }
2019
2020 if (password) {
2021 ret = krb5_init_creds_set_password(context, ctx, password);
2022 if (ret)
2023 goto out;
2024 }
2025
2026 ret = krb5_init_creds_get(context, ctx);
2027
2028 if (ret == 0)
2029 process_last_request(context, options, ctx);
2030
2031
2032 if (ret == KRB5KDC_ERR_KEY_EXPIRED && chpw == 0) {
2033 char buf2[1024];
2034
2035 /* try to avoid recursion */
2036 if (in_tkt_service != NULL && strcmp(in_tkt_service, "kadmin/changepw") == 0)
2037 goto out;
2038
2039 /* don't try to change password where then where none */
2040 if (prompter == NULL)
2041 goto out;
2042
2043 ret = change_password (context,
2044 client,
2045 ctx->password,
2046 buf2,
2047 sizeof(buf),
2048 prompter,
2049 data,
2050 options);
2051 if (ret)
2052 goto out;
2053 chpw = 1;
2054 krb5_init_creds_free(context, ctx);
2055 goto again;
2056 }
2057
2058 out:
2059 if (ret == 0)
2060 krb5_init_creds_get_creds(context, ctx, creds);
2061
2062 if (ctx)
2063 krb5_init_creds_free(context, ctx);
2064
2065 memset(buf, 0, sizeof(buf));
2066 return ret;
2067 }
2068
2069 /**
2070 * Get new credentials using keyblock.
2071 *
2072 * @ingroup krb5_credential
2073 */
2074
2075 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2076 krb5_get_init_creds_keyblock(krb5_context context,
2077 krb5_creds *creds,
2078 krb5_principal client,
2079 krb5_keyblock *keyblock,
2080 krb5_deltat start_time,
2081 const char *in_tkt_service,
2082 krb5_get_init_creds_opt *options)
2083 {
2084 krb5_init_creds_context ctx;
2085 krb5_error_code ret;
2086
2087 memset(creds, 0, sizeof(*creds));
2088
2089 ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
2090 if (ret)
2091 goto out;
2092
2093 ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
2094 if (ret)
2095 goto out;
2096
2097 ret = krb5_init_creds_set_keyblock(context, ctx, keyblock);
2098 if (ret)
2099 goto out;
2100
2101 ret = krb5_init_creds_get(context, ctx);
2102
2103 if (ret == 0)
2104 process_last_request(context, options, ctx);
2105
2106 out:
2107 if (ret == 0)
2108 krb5_init_creds_get_creds(context, ctx, creds);
2109
2110 if (ctx)
2111 krb5_init_creds_free(context, ctx);
2112
2113 return ret;
2114 }
2115
2116 /**
2117 * Get new credentials using keytab.
2118 *
2119 * @ingroup krb5_credential
2120 */
2121
2122 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2123 krb5_get_init_creds_keytab(krb5_context context,
2124 krb5_creds *creds,
2125 krb5_principal client,
2126 krb5_keytab keytab,
2127 krb5_deltat start_time,
2128 const char *in_tkt_service,
2129 krb5_get_init_creds_opt *options)
2130 {
2131 krb5_init_creds_context ctx;
2132 krb5_error_code ret;
2133
2134 memset(creds, 0, sizeof(*creds));
2135
2136 ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
2137 if (ret)
2138 goto out;
2139
2140 ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
2141 if (ret)
2142 goto out;
2143
2144 ret = krb5_init_creds_set_keytab(context, ctx, keytab);
2145 if (ret)
2146 goto out;
2147
2148 ret = krb5_init_creds_get(context, ctx);
2149 if (ret == 0)
2150 process_last_request(context, options, ctx);
2151
2152 out:
2153 if (ret == 0)
2154 krb5_init_creds_get_creds(context, ctx, creds);
2155
2156 if (ctx)
2157 krb5_init_creds_free(context, ctx);
2158
2159 return ret;
2160 }
Heimdal