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move back init_as_req when building packet
[heimdal.git] / lib / krb5 / init_creds_pw.c
blobf34fc30cfc089c1f96106453aa65b52e6da4be9b
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 } fast_state;
88 } krb5_get_init_creds_ctx;
89
90
91 struct pa_info_data {
92 krb5_enctype etype;
93 krb5_salt salt;
94 krb5_data *s2kparams;
95 };
96
97 static void
98 free_paid(krb5_context context, struct pa_info_data *ppaid)
99 {
100 krb5_free_salt(context, ppaid->salt);
101 if (ppaid->s2kparams)
102 krb5_free_data(context, ppaid->s2kparams);
103 }
104
105 static krb5_error_code KRB5_CALLCONV
106 default_s2k_func(krb5_context context, krb5_enctype type,
107 krb5_const_pointer keyseed,
108 krb5_salt salt, krb5_data *s2kparms,
109 krb5_keyblock **key)
110 {
111 krb5_error_code ret;
112 krb5_data password;
113 krb5_data opaque;
114
115 _krb5_debug(context, 5, "krb5_get_init_creds: using default_s2k_func");
116
117 password.data = rk_UNCONST(keyseed);
118 password.length = strlen(keyseed);
119 if (s2kparms)
120 opaque = *s2kparms;
121 else
122 krb5_data_zero(&opaque);
123
124 *key = malloc(sizeof(**key));
125 if (*key == NULL)
126 return ENOMEM;
127 ret = krb5_string_to_key_data_salt_opaque(context, type, password,
128 salt, opaque, *key);
129 if (ret) {
130 free(*key);
131 *key = NULL;
132 }
133 return ret;
134 }
135
136 static void
137 free_init_creds_ctx(krb5_context context, krb5_init_creds_context ctx)
138 {
139 if (ctx->etypes)
140 free(ctx->etypes);
141 if (ctx->pre_auth_types)
142 free (ctx->pre_auth_types);
143 if (ctx->in_tkt_service)
144 free(ctx->in_tkt_service);
145 if (ctx->keytab_data)
146 free(ctx->keytab_data);
147 if (ctx->password) {
148 memset(ctx->password, 0, strlen(ctx->password));
149 free(ctx->password);
150 }
151 krb5_data_free(&ctx->req_buffer);
152 krb5_free_cred_contents(context, &ctx->cred);
153 free_METHOD_DATA(&ctx->md);
154 free_AS_REP(&ctx->as_rep);
155 free_EncKDCRepPart(&ctx->enc_part);
156 free_KRB_ERROR(&ctx->error);
157 free_AS_REQ(&ctx->as_req);
158 if (ctx->ppaid) {
159 free_paid(context, ctx->ppaid);
160 free(ctx->ppaid);
161 }
162 memset(ctx, 0, sizeof(*ctx));
163 }
164
165 static int
166 get_config_time (krb5_context context,
167 const char *realm,
168 const char *name,
169 int def)
170 {
171 int ret;
172
173 ret = krb5_config_get_time (context, NULL,
174 "realms",
175 realm,
176 name,
177 NULL);
178 if (ret >= 0)
179 return ret;
180 ret = krb5_config_get_time (context, NULL,
181 "libdefaults",
182 name,
183 NULL);
184 if (ret >= 0)
185 return ret;
186 return def;
187 }
188
189 static krb5_error_code
190 init_cred (krb5_context context,
191 krb5_creds *cred,
192 krb5_principal client,
193 krb5_deltat start_time,
194 krb5_get_init_creds_opt *options)
195 {
196 krb5_error_code ret;
197 int tmp;
198 krb5_timestamp now;
199
200 krb5_timeofday (context, &now);
201
202 memset (cred, 0, sizeof(*cred));
203
204 if (client)
205 krb5_copy_principal(context, client, &cred->client);
206 else {
207 ret = krb5_get_default_principal (context,
208 &cred->client);
209 if (ret)
210 goto out;
211 }
212
213 if (start_time)
214 cred->times.starttime = now + start_time;
215
216 if (options->flags & KRB5_GET_INIT_CREDS_OPT_TKT_LIFE)
217 tmp = options->tkt_life;
218 else
219 tmp = 10 * 60 * 60;
220 cred->times.endtime = now + tmp;
221
222 if ((options->flags & KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE) &&
223 options->renew_life > 0) {
224 cred->times.renew_till = now + options->renew_life;
225 }
226
227 return 0;
228
229 out:
230 krb5_free_cred_contents (context, cred);
231 return ret;
232 }
233
234 /*
235 * Print a message (str) to the user about the expiration in `lr'
236 */
237
238 static void
239 report_expiration (krb5_context context,
240 krb5_prompter_fct prompter,
241 krb5_data *data,
242 const char *str,
243 time_t now)
244 {
245 char *p = NULL;
246
247 if (asprintf(&p, "%s%s", str, ctime(&now)) < 0 || p == NULL)
248 return;
249 (*prompter)(context, data, NULL, p, 0, NULL);
250 free(p);
251 }
252
253 /*
254 * Check the context, and in the case there is a expiration warning,
255 * use the prompter to print the warning.
256 *
257 * @param context A Kerberos 5 context.
258 * @param options An GIC options structure
259 * @param ctx The krb5_init_creds_context check for expiration.
260 */
261
262 static krb5_error_code
263 process_last_request(krb5_context context,
264 krb5_get_init_creds_opt *options,
265 krb5_init_creds_context ctx)
266 {
267 krb5_const_realm realm;
268 LastReq *lr;
269 krb5_boolean reported = FALSE;
270 krb5_timestamp sec;
271 time_t t;
272 size_t i;
273
274 /*
275 * First check if there is a API consumer.
276 */
277
278 realm = krb5_principal_get_realm (context, ctx->cred.client);
279 lr = &ctx->enc_part.last_req;
280
281 if (options && options->opt_private && options->opt_private->lr.func) {
282 krb5_last_req_entry **lre;
283
284 lre = calloc(lr->len + 1, sizeof(**lre));
285 if (lre == NULL) {
286 krb5_set_error_message(context, ENOMEM,
287 N_("malloc: out of memory", ""));
288 return ENOMEM;
289 }
290 for (i = 0; i < lr->len; i++) {
291 lre[i] = calloc(1, sizeof(*lre[i]));
292 if (lre[i] == NULL)
293 break;
294 lre[i]->lr_type = lr->val[i].lr_type;
295 lre[i]->value = lr->val[i].lr_value;
296 }
297
298 (*options->opt_private->lr.func)(context, lre,
299 options->opt_private->lr.ctx);
300
301 for (i = 0; i < lr->len; i++)
302 free(lre[i]);
303 free(lre);
304 }
305
306 /*
307 * Now check if we should prompt the user
308 */
309
310 if (ctx->prompter == NULL)
311 return 0;
312
313 krb5_timeofday (context, &sec);
314
315 t = sec + get_config_time (context,
316 realm,
317 "warn_pwexpire",
318 7 * 24 * 60 * 60);
319
320 for (i = 0; i < lr->len; ++i) {
321 if (lr->val[i].lr_value <= t) {
322 switch (abs(lr->val[i].lr_type)) {
323 case LR_PW_EXPTIME :
324 report_expiration(context, ctx->prompter,
325 ctx->prompter_data,
326 "Your password will expire at ",
327 lr->val[i].lr_value);
328 reported = TRUE;
329 break;
330 case LR_ACCT_EXPTIME :
331 report_expiration(context, ctx->prompter,
332 ctx->prompter_data,
333 "Your account will expire at ",
334 lr->val[i].lr_value);
335 reported = TRUE;
336 break;
337 }
338 }
339 }
340
341 if (!reported
342 && ctx->enc_part.key_expiration
343 && *ctx->enc_part.key_expiration <= t) {
344 report_expiration(context, ctx->prompter,
345 ctx->prompter_data,
346 "Your password/account will expire at ",
347 *ctx->enc_part.key_expiration);
348 }
349 return 0;
350 }
351
352 static krb5_addresses no_addrs = { 0, NULL };
353
354 static krb5_error_code
355 get_init_creds_common(krb5_context context,
356 krb5_principal client,
357 krb5_deltat start_time,
358 krb5_get_init_creds_opt *options,
359 krb5_init_creds_context ctx)
360 {
361 krb5_get_init_creds_opt *default_opt = NULL;
362 krb5_error_code ret;
363 krb5_enctype *etypes;
364 krb5_preauthtype *pre_auth_types;
365
366 memset(ctx, 0, sizeof(*ctx));
367
368 if (options == NULL) {
369 const char *realm = krb5_principal_get_realm(context, client);
370
371 krb5_get_init_creds_opt_alloc (context, &default_opt);
372 options = default_opt;
373 krb5_get_init_creds_opt_set_default_flags(context, NULL, realm, options);
374 }
375
376 if (options->opt_private) {
377 if (options->opt_private->password) {
378 ret = krb5_init_creds_set_password(context, ctx,
379 options->opt_private->password);
380 if (ret)
381 goto out;
382 }
383
384 ctx->keyproc = options->opt_private->key_proc;
385 ctx->req_pac = options->opt_private->req_pac;
386 ctx->pk_init_ctx = options->opt_private->pk_init_ctx;
387 ctx->ic_flags = options->opt_private->flags;
388 } else
389 ctx->req_pac = KRB5_INIT_CREDS_TRISTATE_UNSET;
390
391 if (ctx->keyproc == NULL)
392 ctx->keyproc = default_s2k_func;
393
394 /* Enterprise name implicitly turns on canonicalize */
395 if ((ctx->ic_flags & KRB5_INIT_CREDS_CANONICALIZE) ||
396 krb5_principal_get_type(context, client) == KRB5_NT_ENTERPRISE_PRINCIPAL)
397 ctx->flags.canonicalize = 1;
398
399 ctx->pre_auth_types = NULL;
400 ctx->addrs = NULL;
401 ctx->etypes = NULL;
402 ctx->pre_auth_types = NULL;
403
404 ret = init_cred(context, &ctx->cred, client, start_time, options);
405 if (ret) {
406 if (default_opt)
407 krb5_get_init_creds_opt_free(context, default_opt);
408 return ret;
409 }
410
411 ret = krb5_init_creds_set_service(context, ctx, NULL);
412 if (ret)
413 goto out;
414
415 if (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE)
416 ctx->flags.forwardable = options->forwardable;
417
418 if (options->flags & KRB5_GET_INIT_CREDS_OPT_PROXIABLE)
419 ctx->flags.proxiable = options->proxiable;
420
421 if (start_time)
422 ctx->flags.postdated = 1;
423 if (ctx->cred.times.renew_till)
424 ctx->flags.renewable = 1;
425 if (options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST) {
426 ctx->addrs = options->address_list;
427 } else if (options->opt_private) {
428 switch (options->opt_private->addressless) {
429 case KRB5_INIT_CREDS_TRISTATE_UNSET:
430 #if KRB5_ADDRESSLESS_DEFAULT == TRUE
431 ctx->addrs = &no_addrs;
432 #else
433 ctx->addrs = NULL;
434 #endif
435 break;
436 case KRB5_INIT_CREDS_TRISTATE_FALSE:
437 ctx->addrs = NULL;
438 break;
439 case KRB5_INIT_CREDS_TRISTATE_TRUE:
440 ctx->addrs = &no_addrs;
441 break;
442 }
443 }
444 if (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST) {
445 if (ctx->etypes)
446 free(ctx->etypes);
447
448 etypes = malloc((options->etype_list_length + 1)
449 * sizeof(krb5_enctype));
450 if (etypes == NULL) {
451 ret = ENOMEM;
452 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
453 goto out;
454 }
455 memcpy (etypes, options->etype_list,
456 options->etype_list_length * sizeof(krb5_enctype));
457 etypes[options->etype_list_length] = ETYPE_NULL;
458 ctx->etypes = etypes;
459 }
460 if (options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST) {
461 pre_auth_types = malloc((options->preauth_list_length + 1)
462 * sizeof(krb5_preauthtype));
463 if (pre_auth_types == NULL) {
464 ret = ENOMEM;
465 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
466 goto out;
467 }
468 memcpy (pre_auth_types, options->preauth_list,
469 options->preauth_list_length * sizeof(krb5_preauthtype));
470 pre_auth_types[options->preauth_list_length] = KRB5_PADATA_NONE;
471 ctx->pre_auth_types = pre_auth_types;
472 }
473 if (options->flags & KRB5_GET_INIT_CREDS_OPT_ANONYMOUS)
474 ctx->flags.request_anonymous = options->anonymous;
475 if (default_opt)
476 krb5_get_init_creds_opt_free(context, default_opt);
477 return 0;
478 out:
479 if (default_opt)
480 krb5_get_init_creds_opt_free(context, default_opt);
481 return ret;
482 }
483
484 static krb5_error_code
485 change_password (krb5_context context,
486 krb5_principal client,
487 const char *password,
488 char *newpw,
489 size_t newpw_sz,
490 krb5_prompter_fct prompter,
491 void *data,
492 krb5_get_init_creds_opt *old_options)
493 {
494 krb5_prompt prompts[2];
495 krb5_error_code ret;
496 krb5_creds cpw_cred;
497 char buf1[BUFSIZ], buf2[BUFSIZ];
498 krb5_data password_data[2];
499 int result_code;
500 krb5_data result_code_string;
501 krb5_data result_string;
502 char *p;
503 krb5_get_init_creds_opt *options;
504
505 memset (&cpw_cred, 0, sizeof(cpw_cred));
506
507 ret = krb5_get_init_creds_opt_alloc(context, &options);
508 if (ret)
509 return ret;
510 krb5_get_init_creds_opt_set_tkt_life (options, 60);
511 krb5_get_init_creds_opt_set_forwardable (options, FALSE);
512 krb5_get_init_creds_opt_set_proxiable (options, FALSE);
513 if (old_options && old_options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST)
514 krb5_get_init_creds_opt_set_preauth_list (options,
515 old_options->preauth_list,
516 old_options->preauth_list_length);
517
518 krb5_data_zero (&result_code_string);
519 krb5_data_zero (&result_string);
520
521 ret = krb5_get_init_creds_password (context,
522 &cpw_cred,
523 client,
524 password,
525 prompter,
526 data,
527 0,
528 "kadmin/changepw",
529 options);
530 krb5_get_init_creds_opt_free(context, options);
531 if (ret)
532 goto out;
533
534 for(;;) {
535 password_data[0].data = buf1;
536 password_data[0].length = sizeof(buf1);
537
538 prompts[0].hidden = 1;
539 prompts[0].prompt = "New password: ";
540 prompts[0].reply = &password_data[0];
541 prompts[0].type = KRB5_PROMPT_TYPE_NEW_PASSWORD;
542
543 password_data[1].data = buf2;
544 password_data[1].length = sizeof(buf2);
545
546 prompts[1].hidden = 1;
547 prompts[1].prompt = "Repeat new password: ";
548 prompts[1].reply = &password_data[1];
549 prompts[1].type = KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN;
550
551 ret = (*prompter) (context, data, NULL, "Changing password",
552 2, prompts);
553 if (ret) {
554 memset (buf1, 0, sizeof(buf1));
555 memset (buf2, 0, sizeof(buf2));
556 goto out;
557 }
558
559 if (strcmp (buf1, buf2) == 0)
560 break;
561 memset (buf1, 0, sizeof(buf1));
562 memset (buf2, 0, sizeof(buf2));
563 }
564
565 ret = krb5_set_password (context,
566 &cpw_cred,
567 buf1,
568 client,
569 &result_code,
570 &result_code_string,
571 &result_string);
572 if (ret)
573 goto out;
574 if (asprintf(&p, "%s: %.*s\n",
575 result_code ? "Error" : "Success",
576 (int)result_string.length,
577 result_string.length > 0 ? (char*)result_string.data : "") < 0)
578 {
579 ret = ENOMEM;
580 goto out;
581 }
582
583 /* return the result */
584 (*prompter) (context, data, NULL, p, 0, NULL);
585
586 free (p);
587 if (result_code == 0) {
588 strlcpy (newpw, buf1, newpw_sz);
589 ret = 0;
590 } else {
591 ret = ENOTTY;
592 krb5_set_error_message(context, ret,
593 N_("failed changing password", ""));
594 }
595
596 out:
597 memset (buf1, 0, sizeof(buf1));
598 memset (buf2, 0, sizeof(buf2));
599 krb5_data_free (&result_string);
600 krb5_data_free (&result_code_string);
601 krb5_free_cred_contents (context, &cpw_cred);
602 return ret;
603 }
604
605
606 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
607 krb5_keyblock_key_proc (krb5_context context,
608 krb5_keytype type,
609 krb5_data *salt,
610 krb5_const_pointer keyseed,
611 krb5_keyblock **key)
612 {
613 return krb5_copy_keyblock (context, keyseed, key);
614 }
615
616 /*
617 *
618 */
619
620 static krb5_error_code
621 init_as_req (krb5_context context,
622 KDCOptions opts,
623 const krb5_creds *creds,
624 const krb5_addresses *addrs,
625 const krb5_enctype *etypes,
626 AS_REQ *a)
627 {
628 krb5_error_code ret;
629
630 memset(a, 0, sizeof(*a));
631
632 a->pvno = 5;
633 a->msg_type = krb_as_req;
634 a->req_body.kdc_options = opts;
635 a->req_body.cname = malloc(sizeof(*a->req_body.cname));
636 if (a->req_body.cname == NULL) {
637 ret = ENOMEM;
638 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
639 goto fail;
640 }
641 a->req_body.sname = malloc(sizeof(*a->req_body.sname));
642 if (a->req_body.sname == NULL) {
643 ret = ENOMEM;
644 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
645 goto fail;
646 }
647
648 ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
649 if (ret)
650 goto fail;
651 ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
652 if (ret)
653 goto fail;
654
655 ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
656 if (ret)
657 goto fail;
658
659 if(creds->times.starttime) {
660 a->req_body.from = malloc(sizeof(*a->req_body.from));
661 if (a->req_body.from == NULL) {
662 ret = ENOMEM;
663 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
664 goto fail;
665 }
666 *a->req_body.from = creds->times.starttime;
667 }
668 if(creds->times.endtime){
669 ALLOC(a->req_body.till, 1);
670 *a->req_body.till = creds->times.endtime;
671 }
672 if(creds->times.renew_till){
673 a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
674 if (a->req_body.rtime == NULL) {
675 ret = ENOMEM;
676 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
677 goto fail;
678 }
679 *a->req_body.rtime = creds->times.renew_till;
680 }
681 a->req_body.nonce = 0;
682 ret = _krb5_init_etype(context,
683 KRB5_PDU_AS_REQUEST,
684 &a->req_body.etype.len,
685 &a->req_body.etype.val,
686 etypes);
687 if (ret)
688 goto fail;
689
690 /*
691 * This means no addresses
692 */
693
694 if (addrs && addrs->len == 0) {
695 a->req_body.addresses = NULL;
696 } else {
697 a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
698 if (a->req_body.addresses == NULL) {
699 ret = ENOMEM;
700 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
701 goto fail;
702 }
703
704 if (addrs)
705 ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
706 else {
707 ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
708 if(ret == 0 && a->req_body.addresses->len == 0) {
709 free(a->req_body.addresses);
710 a->req_body.addresses = NULL;
711 }
712 }
713 if (ret)
714 goto fail;
715 }
716
717 a->req_body.enc_authorization_data = NULL;
718 a->req_body.additional_tickets = NULL;
719
720 a->padata = NULL;
721
722 return 0;
723 fail:
724 free_AS_REQ(a);
725 memset(a, 0, sizeof(*a));
726 return ret;
727 }
728
729
730 static krb5_error_code
731 set_paid(struct pa_info_data *paid, krb5_context context,
732 krb5_enctype etype,
733 krb5_salttype salttype, void *salt_string, size_t salt_len,
734 krb5_data *s2kparams)
735 {
736 paid->etype = etype;
737 paid->salt.salttype = salttype;
738 paid->salt.saltvalue.data = malloc(salt_len + 1);
739 if (paid->salt.saltvalue.data == NULL) {
740 krb5_clear_error_message(context);
741 return ENOMEM;
742 }
743 memcpy(paid->salt.saltvalue.data, salt_string, salt_len);
744 ((char *)paid->salt.saltvalue.data)[salt_len] = '\0';
745 paid->salt.saltvalue.length = salt_len;
746 if (s2kparams) {
747 krb5_error_code ret;
748
749 ret = krb5_copy_data(context, s2kparams, &paid->s2kparams);
750 if (ret) {
751 krb5_clear_error_message(context);
752 krb5_free_salt(context, paid->salt);
753 return ret;
754 }
755 } else
756 paid->s2kparams = NULL;
757
758 return 0;
759 }
760
761 static struct pa_info_data *
762 pa_etype_info2(krb5_context context,
763 const krb5_principal client,
764 const AS_REQ *asreq,
765 struct pa_info_data *paid,
766 heim_octet_string *data)
767 {
768 krb5_error_code ret;
769 ETYPE_INFO2 e;
770 size_t sz;
771 size_t i, j;
772
773 memset(&e, 0, sizeof(e));
774 ret = decode_ETYPE_INFO2(data->data, data->length, &e, &sz);
775 if (ret)
776 goto out;
777 if (e.len == 0)
778 goto out;
779 for (j = 0; j < asreq->req_body.etype.len; j++) {
780 for (i = 0; i < e.len; i++) {
781 if (asreq->req_body.etype.val[j] == e.val[i].etype) {
782 krb5_salt salt;
783 if (e.val[i].salt == NULL)
784 ret = krb5_get_pw_salt(context, client, &salt);
785 else {
786 salt.saltvalue.data = *e.val[i].salt;
787 salt.saltvalue.length = strlen(*e.val[i].salt);
788 ret = 0;
789 }
790 if (ret == 0)
791 ret = set_paid(paid, context, e.val[i].etype,
792 KRB5_PW_SALT,
793 salt.saltvalue.data,
794 salt.saltvalue.length,
795 e.val[i].s2kparams);
796 if (e.val[i].salt == NULL)
797 krb5_free_salt(context, salt);
798 if (ret == 0) {
799 free_ETYPE_INFO2(&e);
800 return paid;
801 }
802 }
803 }
804 }
805 out:
806 free_ETYPE_INFO2(&e);
807 return NULL;
808 }
809
810 static struct pa_info_data *
811 pa_etype_info(krb5_context context,
812 const krb5_principal client,
813 const AS_REQ *asreq,
814 struct pa_info_data *paid,
815 heim_octet_string *data)
816 {
817 krb5_error_code ret;
818 ETYPE_INFO e;
819 size_t sz;
820 size_t i, j;
821
822 memset(&e, 0, sizeof(e));
823 ret = decode_ETYPE_INFO(data->data, data->length, &e, &sz);
824 if (ret)
825 goto out;
826 if (e.len == 0)
827 goto out;
828 for (j = 0; j < asreq->req_body.etype.len; j++) {
829 for (i = 0; i < e.len; i++) {
830 if (asreq->req_body.etype.val[j] == e.val[i].etype) {
831 krb5_salt salt;
832 salt.salttype = KRB5_PW_SALT;
833 if (e.val[i].salt == NULL)
834 ret = krb5_get_pw_salt(context, client, &salt);
835 else {
836 salt.saltvalue = *e.val[i].salt;
837 ret = 0;
838 }
839 if (e.val[i].salttype)
840 salt.salttype = *e.val[i].salttype;
841 if (ret == 0) {
842 ret = set_paid(paid, context, e.val[i].etype,
843 salt.salttype,
844 salt.saltvalue.data,
845 salt.saltvalue.length,
846 NULL);
847 if (e.val[i].salt == NULL)
848 krb5_free_salt(context, salt);
849 }
850 if (ret == 0) {
851 free_ETYPE_INFO(&e);
852 return paid;
853 }
854 }
855 }
856 }
857 out:
858 free_ETYPE_INFO(&e);
859 return NULL;
860 }
861
862 static struct pa_info_data *
863 pa_pw_or_afs3_salt(krb5_context context,
864 const krb5_principal client,
865 const AS_REQ *asreq,
866 struct pa_info_data *paid,
867 heim_octet_string *data)
868 {
869 krb5_error_code ret;
870 if (paid->etype == KRB5_ENCTYPE_NULL)
871 return NULL;
872 ret = set_paid(paid, context,
873 paid->etype,
874 paid->salt.salttype,
875 data->data,
876 data->length,
877 NULL);
878 if (ret)
879 return NULL;
880 return paid;
881 }
882
883
884 struct pa_info {
885 krb5_preauthtype type;
886 struct pa_info_data *(*salt_info)(krb5_context,
887 const krb5_principal,
888 const AS_REQ *,
889 struct pa_info_data *,
890 heim_octet_string *);
891 };
892
893 static struct pa_info pa_prefs[] = {
894 { KRB5_PADATA_ETYPE_INFO2, pa_etype_info2 },
895 { KRB5_PADATA_ETYPE_INFO, pa_etype_info },
896 { KRB5_PADATA_PW_SALT, pa_pw_or_afs3_salt },
897 { KRB5_PADATA_AFS3_SALT, pa_pw_or_afs3_salt }
898 };
899
900 static PA_DATA *
901 find_pa_data(const METHOD_DATA *md, unsigned type)
902 {
903 size_t i;
904 if (md == NULL)
905 return NULL;
906 for (i = 0; i < md->len; i++)
907 if (md->val[i].padata_type == type)
908 return &md->val[i];
909 return NULL;
910 }
911
912 static struct pa_info_data *
913 process_pa_info(krb5_context context,
914 const krb5_principal client,
915 const AS_REQ *asreq,
916 struct pa_info_data *paid,
917 METHOD_DATA *md)
918 {
919 struct pa_info_data *p = NULL;
920 size_t i;
921
922 for (i = 0; p == NULL && i < sizeof(pa_prefs)/sizeof(pa_prefs[0]); i++) {
923 PA_DATA *pa = find_pa_data(md, pa_prefs[i].type);
924 if (pa == NULL)
925 continue;
926 paid->salt.salttype = (krb5_salttype)pa_prefs[i].type;
927 p = (*pa_prefs[i].salt_info)(context, client, asreq,
928 paid, &pa->padata_value);
929 }
930 return p;
931 }
932
933 static krb5_error_code
934 make_pa_enc_timestamp(krb5_context context, METHOD_DATA *md,
935 krb5_enctype etype, krb5_keyblock *key)
936 {
937 PA_ENC_TS_ENC p;
938 unsigned char *buf;
939 size_t buf_size;
940 size_t len = 0;
941 EncryptedData encdata;
942 krb5_error_code ret;
943 int32_t usec;
944 int usec2;
945 krb5_crypto crypto;
946
947 krb5_us_timeofday (context, &p.patimestamp, &usec);
948 usec2 = usec;
949 p.pausec = &usec2;
950
951 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
952 if (ret)
953 return ret;
954 if(buf_size != len)
955 krb5_abortx(context, "internal error in ASN.1 encoder");
956
957 ret = krb5_crypto_init(context, key, 0, &crypto);
958 if (ret) {
959 free(buf);
960 return ret;
961 }
962 ret = krb5_encrypt_EncryptedData(context,
963 crypto,
964 KRB5_KU_PA_ENC_TIMESTAMP,
965 buf,
966 len,
967 0,
968 &encdata);
969 free(buf);
970 krb5_crypto_destroy(context, crypto);
971 if (ret)
972 return ret;
973
974 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
975 free_EncryptedData(&encdata);
976 if (ret)
977 return ret;
978 if(buf_size != len)
979 krb5_abortx(context, "internal error in ASN.1 encoder");
980
981 ret = krb5_padata_add(context, md, KRB5_PADATA_ENC_TIMESTAMP, buf, len);
982 if (ret)
983 free(buf);
984 return ret;
985 }
986
987 static krb5_error_code
988 add_enc_ts_padata(krb5_context context,
989 METHOD_DATA *md,
990 krb5_principal client,
991 krb5_s2k_proc keyproc,
992 krb5_const_pointer keyseed,
993 krb5_enctype *enctypes,
994 unsigned netypes,
995 krb5_salt *salt,
996 krb5_data *s2kparams)
997 {
998 krb5_error_code ret;
999 krb5_salt salt2;
1000 krb5_enctype *ep;
1001 size_t i;
1002
1003 if(salt == NULL) {
1004 /* default to standard salt */
1005 ret = krb5_get_pw_salt (context, client, &salt2);
1006 if (ret)
1007 return ret;
1008 salt = &salt2;
1009 }
1010 if (!enctypes) {
1011 enctypes = context->etypes;
1012 netypes = 0;
1013 for (ep = enctypes; *ep != ETYPE_NULL; ep++)
1014 netypes++;
1015 }
1016
1017 for (i = 0; i < netypes; ++i) {
1018 krb5_keyblock *key;
1019
1020 _krb5_debug(context, 5, "krb5_get_init_creds: using ENC-TS with enctype %d", enctypes[i]);
1021
1022 ret = (*keyproc)(context, enctypes[i], keyseed,
1023 *salt, s2kparams, &key);
1024 if (ret)
1025 continue;
1026 ret = make_pa_enc_timestamp (context, md, enctypes[i], key);
1027 krb5_free_keyblock (context, key);
1028 if (ret)
1029 return ret;
1030 }
1031 if(salt == &salt2)
1032 krb5_free_salt(context, salt2);
1033 return 0;
1034 }
1035
1036 static krb5_error_code
1037 pa_data_to_md_ts_enc(krb5_context context,
1038 const AS_REQ *a,
1039 const krb5_principal client,
1040 krb5_get_init_creds_ctx *ctx,
1041 struct pa_info_data *ppaid,
1042 METHOD_DATA *md)
1043 {
1044 if (ctx->keyproc == NULL || ctx->keyseed == NULL)
1045 return 0;
1046
1047 if (ppaid) {
1048 add_enc_ts_padata(context, md, client,
1049 ctx->keyproc, ctx->keyseed,
1050 &ppaid->etype, 1,
1051 &ppaid->salt, ppaid->s2kparams);
1052 } else {
1053 krb5_salt salt;
1054
1055 _krb5_debug(context, 5, "krb5_get_init_creds: pa-info not found, guessing salt");
1056
1057 /* make a v5 salted pa-data */
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 NULL, NULL);
1062
1063 /* make a v4 salted pa-data */
1064 salt.salttype = KRB5_PW_SALT;
1065 krb5_data_zero(&salt.saltvalue);
1066 add_enc_ts_padata(context, md, client,
1067 ctx->keyproc, ctx->keyseed,
1068 a->req_body.etype.val, a->req_body.etype.len,
1069 &salt, NULL);
1070 }
1071 return 0;
1072 }
1073
1074 static krb5_error_code
1075 pa_data_to_key_plain(krb5_context context,
1076 const krb5_principal client,
1077 krb5_get_init_creds_ctx *ctx,
1078 krb5_salt salt,
1079 krb5_data *s2kparams,
1080 krb5_enctype etype,
1081 krb5_keyblock **key)
1082 {
1083 krb5_error_code ret;
1084
1085 ret = (*ctx->keyproc)(context, etype, ctx->keyseed,
1086 salt, s2kparams, key);
1087 return ret;
1088 }
1089
1090
1091 static krb5_error_code
1092 pa_data_to_md_pkinit(krb5_context context,
1093 const AS_REQ *a,
1094 const krb5_principal client,
1095 int win2k,
1096 krb5_get_init_creds_ctx *ctx,
1097 METHOD_DATA *md)
1098 {
1099 if (ctx->pk_init_ctx == NULL)
1100 return 0;
1101 #ifdef PKINIT
1102 return _krb5_pk_mk_padata(context,
1103 ctx->pk_init_ctx,
1104 ctx->ic_flags,
1105 win2k,
1106 &a->req_body,
1107 ctx->pk_nonce,
1108 md);
1109 #else
1110 krb5_set_error_message(context, EINVAL,
1111 N_("no support for PKINIT compiled in", ""));
1112 return EINVAL;
1113 #endif
1114 }
1115
1116 static krb5_error_code
1117 pa_data_add_pac_request(krb5_context context,
1118 krb5_get_init_creds_ctx *ctx,
1119 METHOD_DATA *md)
1120 {
1121 size_t len = 0, length;
1122 krb5_error_code ret;
1123 PA_PAC_REQUEST req;
1124 void *buf;
1125
1126 switch (ctx->req_pac) {
1127 case KRB5_INIT_CREDS_TRISTATE_UNSET:
1128 return 0; /* don't bother */
1129 case KRB5_INIT_CREDS_TRISTATE_TRUE:
1130 req.include_pac = 1;
1131 break;
1132 case KRB5_INIT_CREDS_TRISTATE_FALSE:
1133 req.include_pac = 0;
1134 }
1135
1136 ASN1_MALLOC_ENCODE(PA_PAC_REQUEST, buf, length,
1137 &req, &len, ret);
1138 if (ret)
1139 return ret;
1140 if(len != length)
1141 krb5_abortx(context, "internal error in ASN.1 encoder");
1142
1143 ret = krb5_padata_add(context, md, KRB5_PADATA_PA_PAC_REQUEST, buf, len);
1144 if (ret)
1145 free(buf);
1146
1147 return 0;
1148 }
1149
1150 /*
1151 * Assumes caller always will free `out_md', even on error.
1152 */
1153
1154 static krb5_error_code
1155 process_pa_data_to_md(krb5_context context,
1156 const krb5_creds *creds,
1157 const AS_REQ *a,
1158 krb5_get_init_creds_ctx *ctx,
1159 METHOD_DATA *in_md,
1160 METHOD_DATA **out_md,
1161 krb5_prompter_fct prompter,
1162 void *prompter_data)
1163 {
1164 krb5_error_code ret;
1165
1166 ALLOC(*out_md, 1);
1167 if (*out_md == NULL) {
1168 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1169 return ENOMEM;
1170 }
1171 (*out_md)->len = 0;
1172 (*out_md)->val = NULL;
1173
1174 if (_krb5_have_debug(context, 5)) {
1175 unsigned i;
1176 _krb5_debug(context, 5, "KDC send %d patypes", in_md->len);
1177 for (i = 0; i < in_md->len; i++)
1178 _krb5_debug(context, 5, "KDC send PA-DATA type: %d", in_md->val[i].padata_type);
1179 }
1180
1181 /*
1182 * Make sure we don't sent both ENC-TS and PK-INIT pa data, no
1183 * need to expose our password protecting our PKCS12 key.
1184 */
1185
1186 if (ctx->pk_init_ctx) {
1187
1188 _krb5_debug(context, 5, "krb5_get_init_creds: "
1189 "prepareing PKINIT padata (%s)",
1190 (ctx->used_pa_types & USED_PKINIT_W2K) ? "win2k" : "ietf");
1191
1192 if (ctx->used_pa_types & USED_PKINIT_W2K) {
1193 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1194 "Already tried pkinit, looping");
1195 return KRB5_GET_IN_TKT_LOOP;
1196 }
1197
1198 ret = pa_data_to_md_pkinit(context, a, creds->client,
1199 (ctx->used_pa_types & USED_PKINIT),
1200 ctx, *out_md);
1201 if (ret)
1202 return ret;
1203
1204 if (ctx->used_pa_types & USED_PKINIT)
1205 ctx->used_pa_types |= USED_PKINIT_W2K;
1206 else
1207 ctx->used_pa_types |= USED_PKINIT;
1208
1209 } else if (in_md->len != 0) {
1210 struct pa_info_data *paid, *ppaid;
1211 unsigned flag;
1212
1213 paid = calloc(1, sizeof(*paid));
1214
1215 paid->etype = KRB5_ENCTYPE_NULL;
1216 ppaid = process_pa_info(context, creds->client, a, paid, in_md);
1217
1218 if (ppaid)
1219 flag = USED_ENC_TS_INFO;
1220 else
1221 flag = USED_ENC_TS_GUESS;
1222
1223 if (ctx->used_pa_types & flag) {
1224 if (ppaid)
1225 free_paid(context, ppaid);
1226 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1227 "Already tried ENC-TS-%s, looping",
1228 flag == USED_ENC_TS_INFO ? "info" : "guess");
1229 return KRB5_GET_IN_TKT_LOOP;
1230 }
1231
1232 pa_data_to_md_ts_enc(context, a, creds->client, ctx, ppaid, *out_md);
1233
1234 ctx->used_pa_types |= flag;
1235
1236 if (ppaid) {
1237 if (ctx->ppaid) {
1238 free_paid(context, ctx->ppaid);
1239 free(ctx->ppaid);
1240 }
1241 ctx->ppaid = ppaid;
1242 } else
1243 free(paid);
1244 }
1245
1246 pa_data_add_pac_request(context, ctx, *out_md);
1247
1248 if ((*out_md)->len == 0) {
1249 free(*out_md);
1250 *out_md = NULL;
1251 }
1252
1253 return 0;
1254 }
1255
1256 static krb5_error_code
1257 process_pa_data_to_key(krb5_context context,
1258 krb5_get_init_creds_ctx *ctx,
1259 krb5_creds *creds,
1260 AS_REQ *a,
1261 AS_REP *rep,
1262 const krb5_krbhst_info *hi,
1263 krb5_keyblock **key)
1264 {
1265 struct pa_info_data paid, *ppaid = NULL;
1266 krb5_error_code ret;
1267 krb5_enctype etype;
1268 PA_DATA *pa;
1269
1270 memset(&paid, 0, sizeof(paid));
1271
1272 etype = rep->enc_part.etype;
1273
1274 if (rep->padata) {
1275 paid.etype = etype;
1276 ppaid = process_pa_info(context, creds->client, a, &paid,
1277 rep->padata);
1278 }
1279 if (ppaid == NULL)
1280 ppaid = ctx->ppaid;
1281 if (ppaid == NULL) {
1282 ret = krb5_get_pw_salt (context, creds->client, &paid.salt);
1283 if (ret)
1284 return ret;
1285 paid.etype = etype;
1286 paid.s2kparams = NULL;
1287 ppaid = &paid;
1288 }
1289
1290 pa = NULL;
1291 if (rep->padata) {
1292 int idx = 0;
1293 pa = krb5_find_padata(rep->padata->val,
1294 rep->padata->len,
1295 KRB5_PADATA_PK_AS_REP,
1296 &idx);
1297 if (pa == NULL) {
1298 idx = 0;
1299 pa = krb5_find_padata(rep->padata->val,
1300 rep->padata->len,
1301 KRB5_PADATA_PK_AS_REP_19,
1302 &idx);
1303 }
1304 }
1305 if (pa && ctx->pk_init_ctx) {
1306 #ifdef PKINIT
1307 _krb5_debug(context, 5, "krb5_get_init_creds: using PKINIT");
1308
1309 ret = _krb5_pk_rd_pa_reply(context,
1310 a->req_body.realm,
1311 ctx->pk_init_ctx,
1312 etype,
1313 hi,
1314 ctx->pk_nonce,
1315 &ctx->req_buffer,
1316 pa,
1317 key);
1318 #else
1319 ret = EINVAL;
1320 krb5_set_error_message(context, ret, N_("no support for PKINIT compiled in", ""));
1321 #endif
1322 } else if (ctx->keyseed) {
1323 _krb5_debug(context, 5, "krb5_get_init_creds: using keyproc");
1324 ret = pa_data_to_key_plain(context, creds->client, ctx,
1325 ppaid->salt, ppaid->s2kparams, etype, key);
1326 } else {
1327 ret = EINVAL;
1328 krb5_set_error_message(context, ret, N_("No usable pa data type", ""));
1329 }
1330
1331 free_paid(context, &paid);
1332 return ret;
1333 }
1334
1335 /**
1336 * Start a new context to get a new initial credential.
1337 *
1338 * @param context A Kerberos 5 context.
1339 * @param client The Kerberos principal to get the credential for, if
1340 * NULL is given, the default principal is used as determined by
1341 * krb5_get_default_principal().
1342 * @param prompter
1343 * @param prompter_data
1344 * @param start_time the time the ticket should start to be valid or 0 for now.
1345 * @param options a options structure, can be NULL for default options.
1346 * @param rctx A new allocated free with krb5_init_creds_free().
1347 *
1348 * @return 0 for success or an Kerberos 5 error code, see krb5_get_error_message().
1349 *
1350 * @ingroup krb5_credential
1351 */
1352
1353 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1354 krb5_init_creds_init(krb5_context context,
1355 krb5_principal client,
1356 krb5_prompter_fct prompter,
1357 void *prompter_data,
1358 krb5_deltat start_time,
1359 krb5_get_init_creds_opt *options,
1360 krb5_init_creds_context *rctx)
1361 {
1362 krb5_init_creds_context ctx;
1363 krb5_error_code ret;
1364
1365 *rctx = NULL;
1366
1367 ctx = calloc(1, sizeof(*ctx));
1368 if (ctx == NULL) {
1369 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1370 return ENOMEM;
1371 }
1372
1373 ret = get_init_creds_common(context, client, start_time, options, ctx);
1374 if (ret) {
1375 free(ctx);
1376 return ret;
1377 }
1378
1379 /* Set a new nonce. */
1380 krb5_generate_random_block (&ctx->nonce, sizeof(ctx->nonce));
1381 ctx->nonce &= 0x7fffffff;
1382 /* XXX these just needs to be the same when using Windows PK-INIT */
1383 ctx->pk_nonce = ctx->nonce;
1384
1385 ctx->prompter = prompter;
1386 ctx->prompter_data = prompter_data;
1387
1388 *rctx = ctx;
1389
1390 return ret;
1391 }
1392
1393 /**
1394 * Sets the service that the is requested. This call is only neede for
1395 * special initial tickets, by default the a krbtgt is fetched in the default realm.
1396 *
1397 * @param context a Kerberos 5 context.
1398 * @param ctx a krb5_init_creds_context context.
1399 * @param service the service given as a string, for example
1400 * "kadmind/admin". If NULL, the default krbtgt in the clients
1401 * realm is set.
1402 *
1403 * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
1404 * @ingroup krb5_credential
1405 */
1406
1407 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1408 krb5_init_creds_set_service(krb5_context context,
1409 krb5_init_creds_context ctx,
1410 const char *service)
1411 {
1412 krb5_const_realm client_realm;
1413 krb5_principal principal;
1414 krb5_error_code ret;
1415
1416 client_realm = krb5_principal_get_realm (context, ctx->cred.client);
1417
1418 if (service) {
1419 ret = krb5_parse_name (context, service, &principal);
1420 if (ret)
1421 return ret;
1422 krb5_principal_set_realm (context, principal, client_realm);
1423 } else {
1424 ret = krb5_make_principal(context, &principal,
1425 client_realm, KRB5_TGS_NAME, client_realm,
1426 NULL);
1427 if (ret)
1428 return ret;
1429 }
1430
1431 /*
1432 * This is for Windows RODC that are picky about what name type
1433 * the server principal have, and the really strange part is that
1434 * they are picky about the AS-REQ name type and not the TGS-REQ
1435 * later. Oh well.
1436 */
1437
1438 if (krb5_principal_is_krbtgt(context, principal))
1439 krb5_principal_set_type(context, principal, KRB5_NT_SRV_INST);
1440
1441 krb5_free_principal(context, ctx->cred.server);
1442 ctx->cred.server = principal;
1443
1444 return 0;
1445 }
1446
1447 /**
1448 * Sets the password that will use for the request.
1449 *
1450 * @param context a Kerberos 5 context.
1451 * @param ctx ctx krb5_init_creds_context context.
1452 * @param password the password to use.
1453 *
1454 * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
1455 * @ingroup krb5_credential
1456 */
1457
1458 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1459 krb5_init_creds_set_password(krb5_context context,
1460 krb5_init_creds_context ctx,
1461 const char *password)
1462 {
1463 if (ctx->password) {
1464 memset(ctx->password, 0, strlen(ctx->password));
1465 free(ctx->password);
1466 }
1467 if (password) {
1468 ctx->password = strdup(password);
1469 if (ctx->password == NULL) {
1470 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
1471 return ENOMEM;
1472 }
1473 ctx->keyseed = (void *) ctx->password;
1474 } else {
1475 ctx->keyseed = NULL;
1476 ctx->password = NULL;
1477 }
1478
1479 return 0;
1480 }
1481
1482 static krb5_error_code KRB5_CALLCONV
1483 keytab_key_proc(krb5_context context, krb5_enctype enctype,
1484 krb5_const_pointer keyseed,
1485 krb5_salt salt, krb5_data *s2kparms,
1486 krb5_keyblock **key)
1487 {
1488 krb5_keytab_key_proc_args *args = rk_UNCONST(keyseed);
1489 krb5_keytab keytab = args->keytab;
1490 krb5_principal principal = args->principal;
1491 krb5_error_code ret;
1492 krb5_keytab real_keytab;
1493 krb5_keytab_entry entry;
1494
1495 if(keytab == NULL)
1496 krb5_kt_default(context, &real_keytab);
1497 else
1498 real_keytab = keytab;
1499
1500 ret = krb5_kt_get_entry (context, real_keytab, principal,
1501 0, enctype, &entry);
1502
1503 if (keytab == NULL)
1504 krb5_kt_close (context, real_keytab);
1505
1506 if (ret)
1507 return ret;
1508
1509 ret = krb5_copy_keyblock (context, &entry.keyblock, key);
1510 krb5_kt_free_entry(context, &entry);
1511 return ret;
1512 }
1513
1514
1515 /**
1516 * Set the keytab to use for authentication.
1517 *
1518 * @param context a Kerberos 5 context.
1519 * @param ctx ctx krb5_init_creds_context context.
1520 * @param keytab the keytab to read the key from.
1521 *
1522 * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
1523 * @ingroup krb5_credential
1524 */
1525
1526 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1527 krb5_init_creds_set_keytab(krb5_context context,
1528 krb5_init_creds_context ctx,
1529 krb5_keytab keytab)
1530 {
1531 krb5_keytab_key_proc_args *a;
1532 krb5_keytab_entry entry;
1533 krb5_kt_cursor cursor;
1534 krb5_enctype *etypes = NULL;
1535 krb5_error_code ret;
1536 size_t netypes = 0;
1537 int kvno = 0;
1538
1539 a = malloc(sizeof(*a));
1540 if (a == NULL) {
1541 krb5_set_error_message(context, ENOMEM,
1542 N_("malloc: out of memory", ""));
1543 return ENOMEM;
1544 }
1545
1546 a->principal = ctx->cred.client;
1547 a->keytab = keytab;
1548
1549 ctx->keytab_data = a;
1550 ctx->keyseed = (void *)a;
1551 ctx->keyproc = keytab_key_proc;
1552
1553 /*
1554 * We need to the KDC what enctypes we support for this keytab,
1555 * esp if the keytab is really a password based entry, then the
1556 * KDC might have more enctypes in the database then what we have
1557 * in the keytab.
1558 */
1559
1560 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1561 if(ret)
1562 goto out;
1563
1564 while(krb5_kt_next_entry(context, keytab, &entry, &cursor) == 0){
1565 void *ptr;
1566
1567 if (!krb5_principal_compare(context, entry.principal, ctx->cred.client))
1568 goto next;
1569
1570 /* check if we ahve this kvno already */
1571 if (entry.vno > kvno) {
1572 /* remove old list of etype */
1573 if (etypes)
1574 free(etypes);
1575 etypes = NULL;
1576 netypes = 0;
1577 kvno = entry.vno;
1578 } else if (entry.vno != kvno)
1579 goto next;
1580
1581 /* check if enctype is supported */
1582 if (krb5_enctype_valid(context, entry.keyblock.keytype) != 0)
1583 goto next;
1584
1585 /* add enctype to supported list */
1586 ptr = realloc(etypes, sizeof(etypes[0]) * (netypes + 2));
1587 if (ptr == NULL)
1588 goto next;
1589
1590 etypes = ptr;
1591 etypes[netypes] = entry.keyblock.keytype;
1592 etypes[netypes + 1] = ETYPE_NULL;
1593 netypes++;
1594 next:
1595 krb5_kt_free_entry(context, &entry);
1596 }
1597 krb5_kt_end_seq_get(context, keytab, &cursor);
1598
1599 if (etypes) {
1600 if (ctx->etypes)
1601 free(ctx->etypes);
1602 ctx->etypes = etypes;
1603 }
1604
1605 out:
1606 return 0;
1607 }
1608
1609 static krb5_error_code KRB5_CALLCONV
1610 keyblock_key_proc(krb5_context context, krb5_enctype enctype,
1611 krb5_const_pointer keyseed,
1612 krb5_salt salt, krb5_data *s2kparms,
1613 krb5_keyblock **key)
1614 {
1615 return krb5_copy_keyblock (context, keyseed, key);
1616 }
1617
1618 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1619 krb5_init_creds_set_keyblock(krb5_context context,
1620 krb5_init_creds_context ctx,
1621 krb5_keyblock *keyblock)
1622 {
1623 ctx->keyseed = (void *)keyblock;
1624 ctx->keyproc = keyblock_key_proc;
1625
1626 return 0;
1627 }
1628
1629 /**
1630 * The core loop if krb5_get_init_creds() function family. Create the
1631 * packets and have the caller send them off to the KDC.
1632 *
1633 * If the caller want all work been done for them, use
1634 * krb5_init_creds_get() instead.
1635 *
1636 * @param context a Kerberos 5 context.
1637 * @param ctx ctx krb5_init_creds_context context.
1638 * @param in input data from KDC, first round it should be reset by krb5_data_zer().
1639 * @param out reply to KDC.
1640 * @param hostinfo KDC address info, first round it can be NULL.
1641 * @param flags status of the round, if
1642 * KRB5_INIT_CREDS_STEP_FLAG_CONTINUE is set, continue one more round.
1643 *
1644 * @return 0 for success, or an Kerberos 5 error code, see
1645 * krb5_get_error_message().
1646 *
1647 * @ingroup krb5_credential
1648 */
1649
1650 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1651 krb5_init_creds_step(krb5_context context,
1652 krb5_init_creds_context ctx,
1653 krb5_data *in,
1654 krb5_data *out,
1655 krb5_krbhst_info *hostinfo,
1656 unsigned int *flags)
1657 {
1658 krb5_error_code ret;
1659 size_t len = 0;
1660 size_t size;
1661
1662 krb5_data_zero(out);
1663
1664 if (ctx->as_req.req_body.cname == NULL) {
1665 ret = init_as_req(context, ctx->flags, &ctx->cred,
1666 ctx->addrs, ctx->etypes, &ctx->as_req);
1667 if (ret) {
1668 free_init_creds_ctx(context, ctx);
1669 return ret;
1670 }
1671 }
1672
1673 #define MAX_PA_COUNTER 10
1674 if (ctx->pa_counter > MAX_PA_COUNTER) {
1675 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1676 N_("Looping %d times while getting "
1677 "initial credentials", ""),
1678 ctx->pa_counter);
1679 return KRB5_GET_IN_TKT_LOOP;
1680 }
1681 ctx->pa_counter++;
1682
1683 _krb5_debug(context, 5, "krb5_get_init_creds: loop %d", ctx->pa_counter);
1684
1685 /* Lets process the input packet */
1686 if (in && in->length) {
1687 krb5_kdc_rep rep;
1688
1689 memset(&rep, 0, sizeof(rep));
1690
1691 _krb5_debug(context, 5, "krb5_get_init_creds: processing input");
1692
1693 ret = decode_AS_REP(in->data, in->length, &rep.kdc_rep, &size);
1694 if (ret == 0) {
1695 unsigned eflags = EXTRACT_TICKET_AS_REQ | EXTRACT_TICKET_TIMESYNC;
1696
1697 if (ctx->flags.canonicalize) {
1698 eflags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
1699 eflags |= EXTRACT_TICKET_MATCH_REALM;
1700 }
1701 if (ctx->ic_flags & KRB5_INIT_CREDS_NO_C_CANON_CHECK)
1702 eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
1703
1704 ret = process_pa_data_to_key(context, ctx, &ctx->cred,
1705 &ctx->as_req, &rep.kdc_rep,
1706 hostinfo, &ctx->fast_state.reply_key);
1707 if (ret) {
1708 free_AS_REP(&rep.kdc_rep);
1709 goto out;
1710 }
1711
1712 _krb5_debug(context, 5, "krb5_get_init_creds: extracting ticket");
1713
1714 ret = _krb5_extract_ticket(context,
1715 &rep,
1716 &ctx->cred,
1717 ctx->fast_state.reply_key,
1718 NULL,
1719 KRB5_KU_AS_REP_ENC_PART,
1720 NULL,
1721 ctx->nonce,
1722 eflags,
1723 NULL,
1724 NULL);
1725 krb5_free_keyblock(context, ctx->fast_state.reply_key);
1726 ctx->fast_state.reply_key = NULL;
1727 *flags = 0;
1728
1729 if (ret == 0)
1730 ret = copy_EncKDCRepPart(&rep.enc_part, &ctx->enc_part);
1731
1732 free_AS_REP(&rep.kdc_rep);
1733 free_EncASRepPart(&rep.enc_part);
1734
1735 return ret;
1736
1737 } else {
1738 /* let's try to parse it as a KRB-ERROR */
1739
1740 _krb5_debug(context, 5, "krb5_get_init_creds: got an error");
1741
1742 free_KRB_ERROR(&ctx->error);
1743
1744 ret = krb5_rd_error(context, in, &ctx->error);
1745 if(ret && in->length && ((char*)in->data)[0] == 4)
1746 ret = KRB5KRB_AP_ERR_V4_REPLY;
1747 if (ret) {
1748 _krb5_debug(context, 5, "krb5_get_init_creds: failed to read error");
1749 goto out;
1750 }
1751
1752 ret = krb5_error_from_rd_error(context, &ctx->error, &ctx->cred);
1753
1754 _krb5_debug(context, 5, "krb5_get_init_creds: KRB-ERROR %d", ret);
1755
1756 /*
1757 * If no preauth was set and KDC requires it, give it one
1758 * more try.
1759 */
1760
1761 if (ret == KRB5KDC_ERR_PREAUTH_REQUIRED) {
1762
1763 free_METHOD_DATA(&ctx->md);
1764 memset(&ctx->md, 0, sizeof(ctx->md));
1765
1766 if (ctx->error.e_data) {
1767 ret = decode_METHOD_DATA(ctx->error.e_data->data,
1768 ctx->error.e_data->length,
1769 &ctx->md,
1770 NULL);
1771 if (ret)
1772 krb5_set_error_message(context, ret,
1773 N_("Failed to decode METHOD-DATA", ""));
1774 } else {
1775 krb5_set_error_message(context, ret,
1776 N_("Preauth required but no preauth "
1777 "options send by KDC", ""));
1778 }
1779 } else if (ret == KRB5KRB_AP_ERR_SKEW && context->kdc_sec_offset == 0) {
1780 /*
1781 * Try adapt to timeskrew when we are using pre-auth, and
1782 * if there was a time skew, try again.
1783 */
1784 krb5_set_real_time(context, ctx->error.stime, -1);
1785 if (context->kdc_sec_offset)
1786 ret = 0;
1787
1788 _krb5_debug(context, 10, "init_creds: err skew updateing kdc offset to %d",
1789 context->kdc_sec_offset);
1790
1791 ctx->used_pa_types = 0;
1792
1793 } else if (ret == KRB5_KDC_ERR_WRONG_REALM && ctx->flags.canonicalize) {
1794 /* client referal to a new realm */
1795
1796 if (ctx->error.crealm == NULL) {
1797 krb5_set_error_message(context, ret,
1798 N_("Got a client referral, not but no realm", ""));
1799 goto out;
1800 }
1801 _krb5_debug(context, 5,
1802 "krb5_get_init_creds: got referal to realm %s",
1803 *ctx->error.crealm);
1804
1805 ret = krb5_principal_set_realm(context,
1806 ctx->cred.client,
1807 *ctx->error.crealm);
1808
1809 ctx->used_pa_types = 0;
1810 }
1811 if (ret)
1812 goto out;
1813 }
1814 }
1815
1816 if (ctx->as_req.padata) {
1817 free_METHOD_DATA(ctx->as_req.padata);
1818 free(ctx->as_req.padata);
1819 ctx->as_req.padata = NULL;
1820 }
1821
1822 /* Set a new nonce. */
1823 ctx->as_req.req_body.nonce = ctx->nonce;
1824
1825 /* fill_in_md_data */
1826 ret = process_pa_data_to_md(context, &ctx->cred, &ctx->as_req, ctx,
1827 &ctx->md, &ctx->as_req.padata,
1828 ctx->prompter, ctx->prompter_data);
1829 if (ret)
1830 goto out;
1831
1832 krb5_data_free(&ctx->req_buffer);
1833
1834 ASN1_MALLOC_ENCODE(AS_REQ,
1835 ctx->req_buffer.data, ctx->req_buffer.length,
1836 &ctx->as_req, &len, ret);
1837 if (ret)
1838 goto out;
1839 if(len != ctx->req_buffer.length)
1840 krb5_abortx(context, "internal error in ASN.1 encoder");
1841
1842 out->data = ctx->req_buffer.data;
1843 out->length = ctx->req_buffer.length;
1844
1845 *flags = KRB5_INIT_CREDS_STEP_FLAG_CONTINUE;
1846
1847 return 0;
1848 out:
1849 return ret;
1850 }
1851
1852 /**
1853 * Extract the newly acquired credentials from krb5_init_creds_context
1854 * context.
1855 *
1856 * @param context A Kerberos 5 context.
1857 * @param ctx
1858 * @param cred credentials, free with krb5_free_cred_contents().
1859 *
1860 * @return 0 for sucess or An Kerberos error code, see krb5_get_error_message().
1861 */
1862
1863 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1864 krb5_init_creds_get_creds(krb5_context context,
1865 krb5_init_creds_context ctx,
1866 krb5_creds *cred)
1867 {
1868 return krb5_copy_creds_contents(context, &ctx->cred, cred);
1869 }
1870
1871 /**
1872 * Get the last error from the transaction.
1873 *
1874 * @return Returns 0 or an error code
1875 *
1876 * @ingroup krb5_credential
1877 */
1878
1879 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1880 krb5_init_creds_get_error(krb5_context context,
1881 krb5_init_creds_context ctx,
1882 KRB_ERROR *error)
1883 {
1884 krb5_error_code ret;
1885
1886 ret = copy_KRB_ERROR(&ctx->error, error);
1887 if (ret)
1888 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
1889
1890 return ret;
1891 }
1892
1893 /**
1894 * Free the krb5_init_creds_context allocated by krb5_init_creds_init().
1895 *
1896 * @param context A Kerberos 5 context.
1897 * @param ctx The krb5_init_creds_context to free.
1898 *
1899 * @ingroup krb5_credential
1900 */
1901
1902 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1903 krb5_init_creds_free(krb5_context context,
1904 krb5_init_creds_context ctx)
1905 {
1906 free_init_creds_ctx(context, ctx);
1907 free(ctx);
1908 }
1909
1910 /**
1911 * Get new credentials as setup by the krb5_init_creds_context.
1912 *
1913 * @param context A Kerberos 5 context.
1914 * @param ctx The krb5_init_creds_context to process.
1915 *
1916 * @ingroup krb5_credential
1917 */
1918
1919 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1920 krb5_init_creds_get(krb5_context context, krb5_init_creds_context ctx)
1921 {
1922 krb5_sendto_ctx stctx = NULL;
1923 krb5_krbhst_info *hostinfo = NULL;
1924 krb5_error_code ret;
1925 krb5_data in, out;
1926 unsigned int flags = 0;
1927
1928 krb5_data_zero(&in);
1929 krb5_data_zero(&out);
1930
1931 ret = krb5_sendto_ctx_alloc(context, &stctx);
1932 if (ret)
1933 goto out;
1934 krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
1935
1936 while (1) {
1937 flags = 0;
1938 ret = krb5_init_creds_step(context, ctx, &in, &out, hostinfo, &flags);
1939 krb5_data_free(&in);
1940 if (ret)
1941 goto out;
1942
1943 if ((flags & 1) == 0)
1944 break;
1945
1946 ret = krb5_sendto_context (context, stctx, &out,
1947 ctx->cred.client->realm, &in);
1948 if (ret)
1949 goto out;
1950
1951 }
1952
1953 out:
1954 if (stctx)
1955 krb5_sendto_ctx_free(context, stctx);
1956
1957 return ret;
1958 }
1959
1960 /**
1961 * Get new credentials using password.
1962 *
1963 * @ingroup krb5_credential
1964 */
1965
1966
1967 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1968 krb5_get_init_creds_password(krb5_context context,
1969 krb5_creds *creds,
1970 krb5_principal client,
1971 const char *password,
1972 krb5_prompter_fct prompter,
1973 void *data,
1974 krb5_deltat start_time,
1975 const char *in_tkt_service,
1976 krb5_get_init_creds_opt *options)
1977 {
1978 krb5_init_creds_context ctx;
1979 char buf[BUFSIZ];
1980 krb5_error_code ret;
1981 int chpw = 0;
1982
1983 again:
1984 ret = krb5_init_creds_init(context, client, prompter, data, start_time, options, &ctx);
1985 if (ret)
1986 goto out;
1987
1988 ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
1989 if (ret)
1990 goto out;
1991
1992 if (prompter != NULL && ctx->password == NULL && password == NULL) {
1993 krb5_prompt prompt;
1994 krb5_data password_data;
1995 char *p, *q;
1996
1997 krb5_unparse_name (context, client, &p);
1998 asprintf (&q, "%s's Password: ", p);
1999 free (p);
2000 prompt.prompt = q;
2001 password_data.data = buf;
2002 password_data.length = sizeof(buf);
2003 prompt.hidden = 1;
2004 prompt.reply = &password_data;
2005 prompt.type = KRB5_PROMPT_TYPE_PASSWORD;
2006
2007 ret = (*prompter) (context, data, NULL, NULL, 1, &prompt);
2008 free (q);
2009 if (ret) {
2010 memset (buf, 0, sizeof(buf));
2011 ret = KRB5_LIBOS_PWDINTR;
2012 krb5_clear_error_message (context);
2013 goto out;
2014 }
2015 password = password_data.data;
2016 }
2017
2018 if (password) {
2019 ret = krb5_init_creds_set_password(context, ctx, password);
2020 if (ret)
2021 goto out;
2022 }
2023
2024 ret = krb5_init_creds_get(context, ctx);
2025
2026 if (ret == 0)
2027 process_last_request(context, options, ctx);
2028
2029
2030 if (ret == KRB5KDC_ERR_KEY_EXPIRED && chpw == 0) {
2031 char buf2[1024];
2032
2033 /* try to avoid recursion */
2034 if (in_tkt_service != NULL && strcmp(in_tkt_service, "kadmin/changepw") == 0)
2035 goto out;
2036
2037 /* don't try to change password where then where none */
2038 if (prompter == NULL)
2039 goto out;
2040
2041 ret = change_password (context,
2042 client,
2043 ctx->password,
2044 buf2,
2045 sizeof(buf),
2046 prompter,
2047 data,
2048 options);
2049 if (ret)
2050 goto out;
2051 chpw = 1;
2052 krb5_init_creds_free(context, ctx);
2053 goto again;
2054 }
2055
2056 out:
2057 if (ret == 0)
2058 krb5_init_creds_get_creds(context, ctx, creds);
2059
2060 if (ctx)
2061 krb5_init_creds_free(context, ctx);
2062
2063 memset(buf, 0, sizeof(buf));
2064 return ret;
2065 }
2066
2067 /**
2068 * Get new credentials using keyblock.
2069 *
2070 * @ingroup krb5_credential
2071 */
2072
2073 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2074 krb5_get_init_creds_keyblock(krb5_context context,
2075 krb5_creds *creds,
2076 krb5_principal client,
2077 krb5_keyblock *keyblock,
2078 krb5_deltat start_time,
2079 const char *in_tkt_service,
2080 krb5_get_init_creds_opt *options)
2081 {
2082 krb5_init_creds_context ctx;
2083 krb5_error_code ret;
2084
2085 memset(creds, 0, sizeof(*creds));
2086
2087 ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
2088 if (ret)
2089 goto out;
2090
2091 ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
2092 if (ret)
2093 goto out;
2094
2095 ret = krb5_init_creds_set_keyblock(context, ctx, keyblock);
2096 if (ret)
2097 goto out;
2098
2099 ret = krb5_init_creds_get(context, ctx);
2100
2101 if (ret == 0)
2102 process_last_request(context, options, ctx);
2103
2104 out:
2105 if (ret == 0)
2106 krb5_init_creds_get_creds(context, ctx, creds);
2107
2108 if (ctx)
2109 krb5_init_creds_free(context, ctx);
2110
2111 return ret;
2112 }
2113
2114 /**
2115 * Get new credentials using keytab.
2116 *
2117 * @ingroup krb5_credential
2118 */
2119
2120 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2121 krb5_get_init_creds_keytab(krb5_context context,
2122 krb5_creds *creds,
2123 krb5_principal client,
2124 krb5_keytab keytab,
2125 krb5_deltat start_time,
2126 const char *in_tkt_service,
2127 krb5_get_init_creds_opt *options)
2128 {
2129 krb5_init_creds_context ctx;
2130 krb5_error_code ret;
2131
2132 memset(creds, 0, sizeof(*creds));
2133
2134 ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
2135 if (ret)
2136 goto out;
2137
2138 ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
2139 if (ret)
2140 goto out;
2141
2142 ret = krb5_init_creds_set_keytab(context, ctx, keytab);
2143 if (ret)
2144 goto out;
2145
2146 ret = krb5_init_creds_get(context, ctx);
2147 if (ret == 0)
2148 process_last_request(context, options, ctx);
2149
2150 out:
2151 if (ret == 0)
2152 krb5_init_creds_get_creds(context, ctx, creds);
2153
2154 if (ctx)
2155 krb5_init_creds_free(context, ctx);
2156
2157 return ret;
2158 }
Heimdal