source: branches/samba-3.5.x/source3/libads/krb5_setpw.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 22.6 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 krb5 set password implementation
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Remus Koos 2001 (remuskoos@yahoo.com)
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include "includes.h"
22#include "smb_krb5.h"
23
24#ifdef HAVE_KRB5
25
26#define DEFAULT_KPASSWD_PORT 464
27
28#define KRB5_KPASSWD_VERS_CHANGEPW 1
29
30#define KRB5_KPASSWD_VERS_SETPW 0xff80
31#define KRB5_KPASSWD_VERS_SETPW_ALT 2
32
33#define KRB5_KPASSWD_SUCCESS 0
34#define KRB5_KPASSWD_MALFORMED 1
35#define KRB5_KPASSWD_HARDERROR 2
36#define KRB5_KPASSWD_AUTHERROR 3
37#define KRB5_KPASSWD_SOFTERROR 4
38#define KRB5_KPASSWD_ACCESSDENIED 5
39#define KRB5_KPASSWD_BAD_VERSION 6
40#define KRB5_KPASSWD_INITIAL_FLAG_NEEDED 7
41
42/* Those are defined by kerberos-set-passwd-02.txt and are probably
43 * not supported by M$ implementation */
44#define KRB5_KPASSWD_POLICY_REJECT 8
45#define KRB5_KPASSWD_BAD_PRINCIPAL 9
46#define KRB5_KPASSWD_ETYPE_NOSUPP 10
47
48/*
49 * we've got to be able to distinguish KRB_ERRORs from other
50 * requests - valid response for CHPW v2 replies.
51 */
52
53#define krb5_is_krb_error(packet) \
54 ( packet && packet->length && (((char *)packet->data)[0] == 0x7e || ((char *)packet->data)[0] == 0x5e))
55
56/* This implements kerberos password change protocol as specified in
57 * kerb-chg-password-02.txt and kerberos-set-passwd-02.txt
58 * as well as microsoft version of the protocol
59 * as specified in kerberos-set-passwd-00.txt
60 */
61static DATA_BLOB encode_krb5_setpw(const char *principal, const char *password)
62{
63 char* princ_part1 = NULL;
64 char* princ_part2 = NULL;
65 char* realm = NULL;
66 char* c;
67 char* princ;
68
69 ASN1_DATA *req;
70 DATA_BLOB ret;
71
72
73 princ = SMB_STRDUP(principal);
74
75 if ((c = strchr_m(princ, '/')) == NULL) {
76 c = princ;
77 } else {
78 *c = '\0';
79 c++;
80 princ_part1 = princ;
81 }
82
83 princ_part2 = c;
84
85 if ((c = strchr_m(c, '@')) != NULL) {
86 *c = '\0';
87 c++;
88 realm = c;
89 } else {
90 /* We must have a realm component. */
91 return data_blob_null;
92 }
93
94 req = asn1_init(talloc_tos());
95 if (req == NULL) {
96 return data_blob_null;
97 }
98
99 asn1_push_tag(req, ASN1_SEQUENCE(0));
100 asn1_push_tag(req, ASN1_CONTEXT(0));
101 asn1_write_OctetString(req, password, strlen(password));
102 asn1_pop_tag(req);
103
104 asn1_push_tag(req, ASN1_CONTEXT(1));
105 asn1_push_tag(req, ASN1_SEQUENCE(0));
106
107 asn1_push_tag(req, ASN1_CONTEXT(0));
108 asn1_write_Integer(req, 1);
109 asn1_pop_tag(req);
110
111 asn1_push_tag(req, ASN1_CONTEXT(1));
112 asn1_push_tag(req, ASN1_SEQUENCE(0));
113
114 if (princ_part1) {
115 asn1_write_GeneralString(req, princ_part1);
116 }
117
118 asn1_write_GeneralString(req, princ_part2);
119 asn1_pop_tag(req);
120 asn1_pop_tag(req);
121 asn1_pop_tag(req);
122 asn1_pop_tag(req);
123
124 asn1_push_tag(req, ASN1_CONTEXT(2));
125 asn1_write_GeneralString(req, realm);
126 asn1_pop_tag(req);
127 asn1_pop_tag(req);
128
129 ret = data_blob(req->data, req->length);
130 asn1_free(req);
131
132 free(princ);
133
134 return ret;
135}
136
137static krb5_error_code build_kpasswd_request(uint16 pversion,
138 krb5_context context,
139 krb5_auth_context auth_context,
140 krb5_data *ap_req,
141 const char *princ,
142 const char *passwd,
143 bool use_tcp,
144 krb5_data *packet)
145{
146 krb5_error_code ret;
147 krb5_data cipherpw;
148 krb5_data encoded_setpw;
149 krb5_replay_data replay;
150 char *p, *msg_start;
151 DATA_BLOB setpw;
152 unsigned int msg_length;
153
154 ret = krb5_auth_con_setflags(context,
155 auth_context,KRB5_AUTH_CONTEXT_DO_SEQUENCE);
156 if (ret) {
157 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
158 error_message(ret)));
159 return ret;
160 }
161
162 /* handle protocol differences in chpw and setpw */
163 if (pversion == KRB5_KPASSWD_VERS_CHANGEPW)
164 setpw = data_blob(passwd, strlen(passwd));
165 else if (pversion == KRB5_KPASSWD_VERS_SETPW ||
166 pversion == KRB5_KPASSWD_VERS_SETPW_ALT)
167 setpw = encode_krb5_setpw(princ, passwd);
168 else
169 return EINVAL;
170
171 if (setpw.data == NULL || setpw.length == 0) {
172 return EINVAL;
173 }
174
175 encoded_setpw.data = (char *)setpw.data;
176 encoded_setpw.length = setpw.length;
177
178 ret = krb5_mk_priv(context, auth_context,
179 &encoded_setpw, &cipherpw, &replay);
180
181 data_blob_free(&setpw); /*from 'encode_krb5_setpw(...)' */
182
183 if (ret) {
184 DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret)));
185 return ret;
186 }
187
188 packet->data = (char *)SMB_MALLOC(ap_req->length + cipherpw.length + (use_tcp ? 10 : 6 ));
189 if (!packet->data)
190 return -1;
191
192
193
194 /* see the RFC for details */
195
196 msg_start = p = ((char *)packet->data) + (use_tcp ? 4 : 0);
197 p += 2;
198 RSSVAL(p, 0, pversion);
199 p += 2;
200 RSSVAL(p, 0, ap_req->length);
201 p += 2;
202 memcpy(p, ap_req->data, ap_req->length);
203 p += ap_req->length;
204 memcpy(p, cipherpw.data, cipherpw.length);
205 p += cipherpw.length;
206 packet->length = PTR_DIFF(p,packet->data);
207 msg_length = PTR_DIFF(p,msg_start);
208
209 if (use_tcp) {
210 RSIVAL(packet->data, 0, msg_length);
211 }
212 RSSVAL(msg_start, 0, msg_length);
213
214 free(cipherpw.data); /* from 'krb5_mk_priv(...)' */
215
216 return 0;
217}
218
219static const struct kpasswd_errors {
220 int result_code;
221 const char *error_string;
222} kpasswd_errors[] = {
223 {KRB5_KPASSWD_MALFORMED, "Malformed request error"},
224 {KRB5_KPASSWD_HARDERROR, "Server error"},
225 {KRB5_KPASSWD_AUTHERROR, "Authentication error"},
226 {KRB5_KPASSWD_SOFTERROR, "Password change rejected"},
227 {KRB5_KPASSWD_ACCESSDENIED, "Client does not have proper authorization"},
228 {KRB5_KPASSWD_BAD_VERSION, "Protocol version not supported"},
229 {KRB5_KPASSWD_INITIAL_FLAG_NEEDED, "Authorization ticket must have initial flag set"},
230 {KRB5_KPASSWD_POLICY_REJECT, "Password rejected due to policy requirements"},
231 {KRB5_KPASSWD_BAD_PRINCIPAL, "Target principal does not exist"},
232 {KRB5_KPASSWD_ETYPE_NOSUPP, "Unsupported encryption type"},
233 {0, NULL}
234};
235
236static krb5_error_code setpw_result_code_string(krb5_context context,
237 int result_code,
238 const char **code_string)
239{
240 unsigned int idx = 0;
241
242 while (kpasswd_errors[idx].error_string != NULL) {
243 if (kpasswd_errors[idx].result_code ==
244 result_code) {
245 *code_string = kpasswd_errors[idx].error_string;
246 return 0;
247 }
248 idx++;
249 }
250 *code_string = "Password change failed";
251 return (0);
252}
253
254 krb5_error_code kpasswd_err_to_krb5_err(krb5_error_code res_code)
255{
256 switch(res_code) {
257 case KRB5_KPASSWD_ACCESSDENIED:
258 return KRB5KDC_ERR_BADOPTION;
259 case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
260 return KRB5KDC_ERR_BADOPTION;
261 /* return KV5M_ALT_METHOD; MIT-only define */
262 case KRB5_KPASSWD_ETYPE_NOSUPP:
263 return KRB5KDC_ERR_ETYPE_NOSUPP;
264 case KRB5_KPASSWD_BAD_PRINCIPAL:
265 return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
266 case KRB5_KPASSWD_POLICY_REJECT:
267 case KRB5_KPASSWD_SOFTERROR:
268 return KRB5KDC_ERR_POLICY;
269 default:
270 return KRB5KRB_ERR_GENERIC;
271 }
272}
273static krb5_error_code parse_setpw_reply(krb5_context context,
274 bool use_tcp,
275 krb5_auth_context auth_context,
276 krb5_data *packet)
277{
278 krb5_data ap_rep;
279 char *p;
280 int vnum, ret, res_code;
281 krb5_data cipherresult;
282 krb5_data clearresult;
283 krb5_ap_rep_enc_part *ap_rep_enc;
284 krb5_replay_data replay;
285 unsigned int msg_length = packet->length;
286
287
288 if (packet->length < (use_tcp ? 8 : 4)) {
289 return KRB5KRB_AP_ERR_MODIFIED;
290 }
291
292 p = (char *)packet->data;
293 /*
294 ** see if it is an error
295 */
296 if (krb5_is_krb_error(packet)) {
297
298 ret = handle_krberror_packet(context, packet);
299 if (ret) {
300 return ret;
301 }
302 }
303
304
305 /* tcp... */
306 if (use_tcp) {
307 msg_length -= 4;
308 if (RIVAL(p, 0) != msg_length) {
309 DEBUG(1,("Bad TCP packet length (%d/%d) from kpasswd server\n",
310 RIVAL(p, 0), msg_length));
311 return KRB5KRB_AP_ERR_MODIFIED;
312 }
313
314 p += 4;
315 }
316
317 if (RSVAL(p, 0) != msg_length) {
318 DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n",
319 RSVAL(p, 0), msg_length));
320 return KRB5KRB_AP_ERR_MODIFIED;
321 }
322
323 p += 2;
324
325 vnum = RSVAL(p, 0); p += 2;
326
327 /* FIXME: According to standard there is only one type of reply */
328 if (vnum != KRB5_KPASSWD_VERS_SETPW &&
329 vnum != KRB5_KPASSWD_VERS_SETPW_ALT &&
330 vnum != KRB5_KPASSWD_VERS_CHANGEPW) {
331 DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum));
332 return KRB5KDC_ERR_BAD_PVNO;
333 }
334
335 ap_rep.length = RSVAL(p, 0); p += 2;
336
337 if (p + ap_rep.length >= (char *)packet->data + packet->length) {
338 DEBUG(1,("ptr beyond end of packet from kpasswd server\n"));
339 return KRB5KRB_AP_ERR_MODIFIED;
340 }
341
342 if (ap_rep.length == 0) {
343 DEBUG(1,("got unencrypted setpw result?!\n"));
344 return KRB5KRB_AP_ERR_MODIFIED;
345 }
346
347 /* verify ap_rep */
348 ap_rep.data = p;
349 p += ap_rep.length;
350
351 ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc);
352 if (ret) {
353 DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret)));
354 return KRB5KRB_AP_ERR_MODIFIED;
355 }
356
357 krb5_free_ap_rep_enc_part(context, ap_rep_enc);
358
359 cipherresult.data = p;
360 cipherresult.length = ((char *)packet->data + packet->length) - p;
361
362 ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
363 &replay);
364 if (ret) {
365 DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret)));
366 return KRB5KRB_AP_ERR_MODIFIED;
367 }
368
369 if (clearresult.length < 2) {
370 free(clearresult.data);
371 ret = KRB5KRB_AP_ERR_MODIFIED;
372 return KRB5KRB_AP_ERR_MODIFIED;
373 }
374
375 p = (char *)clearresult.data;
376
377 res_code = RSVAL(p, 0);
378
379 free(clearresult.data);
380
381 if ((res_code < KRB5_KPASSWD_SUCCESS) ||
382 (res_code > KRB5_KPASSWD_ETYPE_NOSUPP)) {
383 return KRB5KRB_AP_ERR_MODIFIED;
384 }
385
386 if (res_code == KRB5_KPASSWD_SUCCESS) {
387 return 0;
388 } else {
389 const char *errstr;
390 setpw_result_code_string(context, res_code, &errstr);
391 DEBUG(1, ("Error changing password: %s (%d)\n", errstr, res_code));
392
393 return kpasswd_err_to_krb5_err(res_code);
394 }
395}
396
397static ADS_STATUS do_krb5_kpasswd_request(krb5_context context,
398 const char *kdc_host,
399 uint16 pversion,
400 krb5_creds *credsp,
401 const char *princ,
402 const char *newpw)
403{
404 krb5_auth_context auth_context = NULL;
405 krb5_data ap_req, chpw_req, chpw_rep;
406 int ret, sock;
407 socklen_t addr_len;
408 struct sockaddr_storage remote_addr, local_addr;
409 struct sockaddr_storage addr;
410 krb5_address local_kaddr, remote_kaddr;
411 bool use_tcp = False;
412
413
414 if (!interpret_string_addr(&addr, kdc_host, 0)) {
415 }
416
417 ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
418 NULL, credsp, &ap_req);
419 if (ret) {
420 DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret)));
421 return ADS_ERROR_KRB5(ret);
422 }
423
424 do {
425
426 if (!use_tcp) {
427
428 sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT);
429 if (sock == -1) {
430 int rc = errno;
431 SAFE_FREE(ap_req.data);
432 krb5_auth_con_free(context, auth_context);
433 DEBUG(1,("failed to open kpasswd socket to %s "
434 "(%s)\n", kdc_host, strerror(errno)));
435 return ADS_ERROR_SYSTEM(rc);
436 }
437 } else {
438 NTSTATUS status;
439 status = open_socket_out(&addr, DEFAULT_KPASSWD_PORT,
440 LONG_CONNECT_TIMEOUT, &sock);
441 if (!NT_STATUS_IS_OK(status)) {
442 SAFE_FREE(ap_req.data);
443 krb5_auth_con_free(context, auth_context);
444 DEBUG(1,("failed to open kpasswd socket to %s "
445 "(%s)\n", kdc_host,
446 nt_errstr(status)));
447 return ADS_ERROR_NT(status);
448 }
449 }
450
451 addr_len = sizeof(remote_addr);
452 if (getpeername(sock, (struct sockaddr *)&remote_addr, &addr_len) != 0) {
453 close(sock);
454 SAFE_FREE(ap_req.data);
455 krb5_auth_con_free(context, auth_context);
456 DEBUG(1,("getpeername() failed (%s)\n", error_message(errno)));
457 return ADS_ERROR_SYSTEM(errno);
458 }
459 addr_len = sizeof(local_addr);
460 if (getsockname(sock, (struct sockaddr *)&local_addr, &addr_len) != 0) {
461 close(sock);
462 SAFE_FREE(ap_req.data);
463 krb5_auth_con_free(context, auth_context);
464 DEBUG(1,("getsockname() failed (%s)\n", error_message(errno)));
465 return ADS_ERROR_SYSTEM(errno);
466 }
467 if (!setup_kaddr(&remote_kaddr, &remote_addr) ||
468 !setup_kaddr(&local_kaddr, &local_addr)) {
469 DEBUG(1,("do_krb5_kpasswd_request: "
470 "Failed to setup addresses.\n"));
471 close(sock);
472 SAFE_FREE(ap_req.data);
473 krb5_auth_con_free(context, auth_context);
474 errno = EINVAL;
475 return ADS_ERROR_SYSTEM(EINVAL);
476 }
477
478 ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL);
479 if (ret) {
480 close(sock);
481 SAFE_FREE(ap_req.data);
482 krb5_auth_con_free(context, auth_context);
483 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret)));
484 return ADS_ERROR_KRB5(ret);
485 }
486
487 ret = build_kpasswd_request(pversion, context, auth_context, &ap_req,
488 princ, newpw, use_tcp, &chpw_req);
489 if (ret) {
490 close(sock);
491 SAFE_FREE(ap_req.data);
492 krb5_auth_con_free(context, auth_context);
493 DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
494 return ADS_ERROR_KRB5(ret);
495 }
496
497 ret = write(sock, chpw_req.data, chpw_req.length);
498
499 if (ret != chpw_req.length) {
500 close(sock);
501 SAFE_FREE(chpw_req.data);
502 SAFE_FREE(ap_req.data);
503 krb5_auth_con_free(context, auth_context);
504 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
505 return ADS_ERROR_SYSTEM(errno);
506 }
507
508 SAFE_FREE(chpw_req.data);
509
510 chpw_rep.length = 1500;
511 chpw_rep.data = (char *) SMB_MALLOC(chpw_rep.length);
512 if (!chpw_rep.data) {
513 close(sock);
514 SAFE_FREE(ap_req.data);
515 krb5_auth_con_free(context, auth_context);
516 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
517 errno = ENOMEM;
518 return ADS_ERROR_SYSTEM(errno);
519 }
520
521 ret = read(sock, chpw_rep.data, chpw_rep.length);
522 if (ret < 0) {
523 close(sock);
524 SAFE_FREE(chpw_rep.data);
525 SAFE_FREE(ap_req.data);
526 krb5_auth_con_free(context, auth_context);
527 DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
528 return ADS_ERROR_SYSTEM(errno);
529 }
530
531 close(sock);
532 chpw_rep.length = ret;
533
534 ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr);
535 if (ret) {
536 SAFE_FREE(chpw_rep.data);
537 SAFE_FREE(ap_req.data);
538 krb5_auth_con_free(context, auth_context);
539 DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n",
540 error_message(ret)));
541 return ADS_ERROR_KRB5(ret);
542 }
543
544 ret = parse_setpw_reply(context, use_tcp, auth_context, &chpw_rep);
545 SAFE_FREE(chpw_rep.data);
546
547 if (ret) {
548
549 if (ret == KRB5KRB_ERR_RESPONSE_TOO_BIG && !use_tcp) {
550 DEBUG(5, ("Trying setpw with TCP!!!\n"));
551 use_tcp = True;
552 continue;
553 }
554
555 SAFE_FREE(ap_req.data);
556 krb5_auth_con_free(context, auth_context);
557 DEBUG(1,("parse_setpw_reply failed (%s)\n",
558 error_message(ret)));
559 return ADS_ERROR_KRB5(ret);
560 }
561
562 SAFE_FREE(ap_req.data);
563 krb5_auth_con_free(context, auth_context);
564 } while ( ret );
565
566 return ADS_SUCCESS;
567}
568
569ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *princ,
570 const char *newpw, int time_offset)
571{
572
573 ADS_STATUS aret;
574 krb5_error_code ret = 0;
575 krb5_context context = NULL;
576 krb5_principal principal = NULL;
577 char *princ_name = NULL;
578 char *realm = NULL;
579 krb5_creds creds, *credsp = NULL;
580#if KRB5_PRINC_REALM_RETURNS_REALM
581 krb5_realm orig_realm;
582#else
583 krb5_data orig_realm;
584#endif
585 krb5_ccache ccache = NULL;
586
587 ZERO_STRUCT(creds);
588
589 initialize_krb5_error_table();
590 ret = krb5_init_context(&context);
591 if (ret) {
592 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
593 return ADS_ERROR_KRB5(ret);
594 }
595
596 if (time_offset != 0) {
597 krb5_set_real_time(context, time(NULL) + time_offset, 0);
598 }
599
600 ret = krb5_cc_default(context, &ccache);
601 if (ret) {
602 krb5_free_context(context);
603 DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
604 return ADS_ERROR_KRB5(ret);
605 }
606
607 realm = strchr_m(princ, '@');
608 if (!realm) {
609 krb5_cc_close(context, ccache);
610 krb5_free_context(context);
611 DEBUG(1,("Failed to get realm\n"));
612 return ADS_ERROR_KRB5(-1);
613 }
614 realm++;
615
616 if (asprintf(&princ_name, "kadmin/changepw@%s", realm) == -1) {
617 krb5_cc_close(context, ccache);
618 krb5_free_context(context);
619 DEBUG(1,("asprintf failed\n"));
620 return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
621 }
622
623 ret = smb_krb5_parse_name(context, princ_name, &creds.server);
624 if (ret) {
625 krb5_cc_close(context, ccache);
626 krb5_free_context(context);
627 DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
628 return ADS_ERROR_KRB5(ret);
629 }
630
631 /* parse the principal we got as a function argument */
632 ret = smb_krb5_parse_name(context, princ, &principal);
633 if (ret) {
634 krb5_cc_close(context, ccache);
635 krb5_free_principal(context, creds.server);
636 krb5_free_context(context);
637 DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
638 free(princ_name);
639 return ADS_ERROR_KRB5(ret);
640 }
641
642 free(princ_name);
643
644 /* The creds.server principal takes ownership of this memory.
645 Remember to set back to original value before freeing. */
646 orig_realm = *krb5_princ_realm(context, creds.server);
647 krb5_princ_set_realm(context, creds.server, krb5_princ_realm(context, principal));
648
649 ret = krb5_cc_get_principal(context, ccache, &creds.client);
650 if (ret) {
651 krb5_cc_close(context, ccache);
652 krb5_princ_set_realm(context, creds.server, &orig_realm);
653 krb5_free_principal(context, creds.server);
654 krb5_free_principal(context, principal);
655 krb5_free_context(context);
656 DEBUG(1,("Failed to get principal from ccache (%s)\n",
657 error_message(ret)));
658 return ADS_ERROR_KRB5(ret);
659 }
660
661 ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
662 if (ret) {
663 krb5_cc_close(context, ccache);
664 krb5_free_principal(context, creds.client);
665 krb5_princ_set_realm(context, creds.server, &orig_realm);
666 krb5_free_principal(context, creds.server);
667 krb5_free_principal(context, principal);
668 krb5_free_context(context);
669 DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
670 return ADS_ERROR_KRB5(ret);
671 }
672
673 /* we might have to call krb5_free_creds(...) from now on ... */
674
675 aret = do_krb5_kpasswd_request(context, kdc_host,
676 KRB5_KPASSWD_VERS_SETPW,
677 credsp, princ, newpw);
678
679 krb5_free_creds(context, credsp);
680 krb5_free_principal(context, creds.client);
681 krb5_princ_set_realm(context, creds.server, &orig_realm);
682 krb5_free_principal(context, creds.server);
683 krb5_free_principal(context, principal);
684 krb5_cc_close(context, ccache);
685 krb5_free_context(context);
686
687 return aret;
688}
689
690/*
691 we use a prompter to avoid a crash bug in the kerberos libs when
692 dealing with empty passwords
693 this prompter is just a string copy ...
694*/
695static krb5_error_code
696kerb_prompter(krb5_context ctx, void *data,
697 const char *name,
698 const char *banner,
699 int num_prompts,
700 krb5_prompt prompts[])
701{
702 if (num_prompts == 0) return 0;
703
704 memset(prompts[0].reply->data, 0, prompts[0].reply->length);
705 if (prompts[0].reply->length > 0) {
706 if (data) {
707 strncpy((char *)prompts[0].reply->data,
708 (const char *)data,
709 prompts[0].reply->length-1);
710 prompts[0].reply->length = strlen((const char *)prompts[0].reply->data);
711 } else {
712 prompts[0].reply->length = 0;
713 }
714 }
715 return 0;
716}
717
718static ADS_STATUS ads_krb5_chg_password(const char *kdc_host,
719 const char *principal,
720 const char *oldpw,
721 const char *newpw,
722 int time_offset)
723{
724 ADS_STATUS aret;
725 krb5_error_code ret;
726 krb5_context context = NULL;
727 krb5_principal princ;
728 krb5_get_init_creds_opt opts;
729 krb5_creds creds;
730 char *chpw_princ = NULL, *password;
731
732 initialize_krb5_error_table();
733 ret = krb5_init_context(&context);
734 if (ret) {
735 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
736 return ADS_ERROR_KRB5(ret);
737 }
738
739 if ((ret = smb_krb5_parse_name(context, principal,
740 &princ))) {
741 krb5_free_context(context);
742 DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret)));
743 return ADS_ERROR_KRB5(ret);
744 }
745
746 krb5_get_init_creds_opt_init(&opts);
747 krb5_get_init_creds_opt_set_tkt_life(&opts, 5*60);
748 krb5_get_init_creds_opt_set_renew_life(&opts, 0);
749 krb5_get_init_creds_opt_set_forwardable(&opts, 0);
750 krb5_get_init_creds_opt_set_proxiable(&opts, 0);
751
752 /* We have to obtain an INITIAL changepw ticket for changing password */
753 if (asprintf(&chpw_princ, "kadmin/changepw@%s",
754 (char *) krb5_princ_realm(context, princ)) == -1) {
755 krb5_free_context(context);
756 DEBUG(1,("ads_krb5_chg_password: asprintf fail\n"));
757 return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
758 }
759
760 password = SMB_STRDUP(oldpw);
761 ret = krb5_get_init_creds_password(context, &creds, princ, password,
762 kerb_prompter, NULL,
763 0, chpw_princ, &opts);
764 SAFE_FREE(chpw_princ);
765 SAFE_FREE(password);
766
767 if (ret) {
768 if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
769 DEBUG(1,("Password incorrect while getting initial ticket"));
770 else
771 DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret)));
772
773 krb5_free_principal(context, princ);
774 krb5_free_context(context);
775 return ADS_ERROR_KRB5(ret);
776 }
777
778 aret = do_krb5_kpasswd_request(context, kdc_host,
779 KRB5_KPASSWD_VERS_CHANGEPW,
780 &creds, principal, newpw);
781
782 krb5_free_principal(context, princ);
783 krb5_free_context(context);
784
785 return aret;
786}
787
788
789ADS_STATUS kerberos_set_password(const char *kpasswd_server,
790 const char *auth_principal, const char *auth_password,
791 const char *target_principal, const char *new_password,
792 int time_offset)
793{
794 int ret;
795
796 if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset, NULL))) {
797 DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
798 return ADS_ERROR_KRB5(ret);
799 }
800
801 if (!strcmp(auth_principal, target_principal))
802 return ads_krb5_chg_password(kpasswd_server, target_principal,
803 auth_password, new_password, time_offset);
804 else
805 return ads_krb5_set_password(kpasswd_server, target_principal,
806 new_password, time_offset);
807}
808
809
810/**
811 * Set the machine account password
812 * @param ads connection to ads server
813 * @param hostname machine whose password is being set
814 * @param password new password
815 * @return status of password change
816 **/
817ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
818 const char *machine_account,
819 const char *password)
820{
821 ADS_STATUS status;
822 char *principal = NULL;
823
824 /*
825 we need to use the '$' form of the name here (the machine account name),
826 as otherwise the server might end up setting the password for a user
827 instead
828 */
829 if (asprintf(&principal, "%s@%s", machine_account, ads->config.realm) < 0) {
830 return ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
831 }
832
833 status = ads_krb5_set_password(ads->auth.kdc_server, principal,
834 password, ads->auth.time_offset);
835
836 SAFE_FREE(principal);
837 return status;
838}
839#endif
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