source: trunk-3.0/source/libads/krb5_setpw.c@ 101

Last change on this file since 101 was 1, checked in by Paul Smedley, 18 years ago

Initial code import
File size: 21.2 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 2 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20*/
21
22#include "includes.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, 0);
92 }
93
94 memset(&req, 0, sizeof(req));
95
96 asn1_push_tag(&req, ASN1_SEQUENCE(0));
97 asn1_push_tag(&req, ASN1_CONTEXT(0));
98 asn1_write_OctetString(&req, password, strlen(password));
99 asn1_pop_tag(&req);
100
101 asn1_push_tag(&req, ASN1_CONTEXT(1));
102 asn1_push_tag(&req, ASN1_SEQUENCE(0));
103
104 asn1_push_tag(&req, ASN1_CONTEXT(0));
105 asn1_write_Integer(&req, 1);
106 asn1_pop_tag(&req);
107
108 asn1_push_tag(&req, ASN1_CONTEXT(1));
109 asn1_push_tag(&req, ASN1_SEQUENCE(0));
110
111 if (princ_part1) {
112 asn1_write_GeneralString(&req, princ_part1);
113 }
114
115 asn1_write_GeneralString(&req, princ_part2);
116 asn1_pop_tag(&req);
117 asn1_pop_tag(&req);
118 asn1_pop_tag(&req);
119 asn1_pop_tag(&req);
120
121 asn1_push_tag(&req, ASN1_CONTEXT(2));
122 asn1_write_GeneralString(&req, realm);
123 asn1_pop_tag(&req);
124 asn1_pop_tag(&req);
125
126 ret = data_blob(req.data, req.length);
127 asn1_free(&req);
128
129 free(princ);
130
131 return ret;
132}
133
134static krb5_error_code build_kpasswd_request(uint16 pversion,
135 krb5_context context,
136 krb5_auth_context auth_context,
137 krb5_data *ap_req,
138 const char *princ,
139 const char *passwd,
140 BOOL use_tcp,
141 krb5_data *packet)
142{
143 krb5_error_code ret;
144 krb5_data cipherpw;
145 krb5_data encoded_setpw;
146 krb5_replay_data replay;
147 char *p, *msg_start;
148 DATA_BLOB setpw;
149 unsigned int msg_length;
150
151 ret = krb5_auth_con_setflags(context,
152 auth_context,KRB5_AUTH_CONTEXT_DO_SEQUENCE);
153 if (ret) {
154 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
155 error_message(ret)));
156 return ret;
157 }
158
159 /* handle protocol differences in chpw and setpw */
160 if (pversion == KRB5_KPASSWD_VERS_CHANGEPW)
161 setpw = data_blob(passwd, strlen(passwd));
162 else if (pversion == KRB5_KPASSWD_VERS_SETPW ||
163 pversion == KRB5_KPASSWD_VERS_SETPW_ALT)
164 setpw = encode_krb5_setpw(princ, passwd);
165 else
166 return EINVAL;
167
168 if (setpw.data == NULL || setpw.length == 0) {
169 return EINVAL;
170 }
171
172 encoded_setpw.data = (char *)setpw.data;
173 encoded_setpw.length = setpw.length;
174
175 ret = krb5_mk_priv(context, auth_context,
176 &encoded_setpw, &cipherpw, &replay);
177
178 data_blob_free(&setpw); /*from 'encode_krb5_setpw(...)' */
179
180 if (ret) {
181 DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret)));
182 return ret;
183 }
184
185 packet->data = (char *)SMB_MALLOC(ap_req->length + cipherpw.length + (use_tcp ? 10 : 6 ));
186 if (!packet->data)
187 return -1;
188
189
190
191 /* see the RFC for details */
192
193 msg_start = p = ((char *)packet->data) + (use_tcp ? 4 : 0);
194 p += 2;
195 RSSVAL(p, 0, pversion);
196 p += 2;
197 RSSVAL(p, 0, ap_req->length);
198 p += 2;
199 memcpy(p, ap_req->data, ap_req->length);
200 p += ap_req->length;
201 memcpy(p, cipherpw.data, cipherpw.length);
202 p += cipherpw.length;
203 packet->length = PTR_DIFF(p,packet->data);
204 msg_length = PTR_DIFF(p,msg_start);
205
206 if (use_tcp) {
207 RSIVAL(packet->data, 0, msg_length);
208 }
209 RSSVAL(msg_start, 0, msg_length);
210
211 free(cipherpw.data); /* from 'krb5_mk_priv(...)' */
212
213 return 0;
214}
215
216static const struct kpasswd_errors {
217 int result_code;
218 const char *error_string;
219} kpasswd_errors[] = {
220 {KRB5_KPASSWD_MALFORMED, "Malformed request error"},
221 {KRB5_KPASSWD_HARDERROR, "Server error"},
222 {KRB5_KPASSWD_AUTHERROR, "Authentication error"},
223 {KRB5_KPASSWD_SOFTERROR, "Password change rejected"},
224 {KRB5_KPASSWD_ACCESSDENIED, "Client does not have proper authorization"},
225 {KRB5_KPASSWD_BAD_VERSION, "Protocol version not supported"},
226 {KRB5_KPASSWD_INITIAL_FLAG_NEEDED, "Authorization ticket must have initial flag set"},
227 {KRB5_KPASSWD_POLICY_REJECT, "Password rejected due to policy requirements"},
228 {KRB5_KPASSWD_BAD_PRINCIPAL, "Target principal does not exist"},
229 {KRB5_KPASSWD_ETYPE_NOSUPP, "Unsupported encryption type"},
230 {0, NULL}
231};
232
233static krb5_error_code setpw_result_code_string(krb5_context context,
234 int result_code,
235 const char **code_string)
236{
237 unsigned int idx = 0;
238
239 while (kpasswd_errors[idx].error_string != NULL) {
240 if (kpasswd_errors[idx].result_code ==
241 result_code) {
242 *code_string = kpasswd_errors[idx].error_string;
243 return 0;
244 }
245 idx++;
246 }
247 *code_string = "Password change failed";
248 return (0);
249}
250
251 krb5_error_code kpasswd_err_to_krb5_err(krb5_error_code res_code)
252{
253 switch(res_code) {
254 case KRB5_KPASSWD_ACCESSDENIED:
255 return KRB5KDC_ERR_BADOPTION;
256 case KRB5_KPASSWD_INITIAL_FLAG_NEEDED:
257 return KRB5KDC_ERR_BADOPTION;
258 /* return KV5M_ALT_METHOD; MIT-only define */
259 case KRB5_KPASSWD_ETYPE_NOSUPP:
260 return KRB5KDC_ERR_ETYPE_NOSUPP;
261 case KRB5_KPASSWD_BAD_PRINCIPAL:
262 return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
263 case KRB5_KPASSWD_POLICY_REJECT:
264 case KRB5_KPASSWD_SOFTERROR:
265 return KRB5KDC_ERR_POLICY;
266 default:
267 return KRB5KRB_ERR_GENERIC;
268 }
269}
270static krb5_error_code parse_setpw_reply(krb5_context context,
271 BOOL use_tcp,
272 krb5_auth_context auth_context,
273 krb5_data *packet)
274{
275 krb5_data ap_rep;
276 char *p;
277 int vnum, ret, res_code;
278 krb5_data cipherresult;
279 krb5_data clearresult;
280 krb5_ap_rep_enc_part *ap_rep_enc;
281 krb5_replay_data replay;
282 unsigned int msg_length = packet->length;
283
284
285 if (packet->length < (use_tcp ? 8 : 4)) {
286 return KRB5KRB_AP_ERR_MODIFIED;
287 }
288
289 p = packet->data;
290 /*
291 ** see if it is an error
292 */
293 if (krb5_is_krb_error(packet)) {
294
295 ret = handle_krberror_packet(context, packet);
296 if (ret) {
297 return ret;
298 }
299 }
300
301
302 /* tcp... */
303 if (use_tcp) {
304 msg_length -= 4;
305 if (RIVAL(p, 0) != msg_length) {
306 DEBUG(1,("Bad TCP packet length (%d/%d) from kpasswd server\n",
307 RIVAL(p, 0), msg_length));
308 return KRB5KRB_AP_ERR_MODIFIED;
309 }
310
311 p += 4;
312 }
313
314 if (RSVAL(p, 0) != msg_length) {
315 DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n",
316 RSVAL(p, 0), msg_length));
317 return KRB5KRB_AP_ERR_MODIFIED;
318 }
319
320 p += 2;
321
322 vnum = RSVAL(p, 0); p += 2;
323
324 /* FIXME: According to standard there is only one type of reply */
325 if (vnum != KRB5_KPASSWD_VERS_SETPW &&
326 vnum != KRB5_KPASSWD_VERS_SETPW_ALT &&
327 vnum != KRB5_KPASSWD_VERS_CHANGEPW) {
328 DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum));
329 return KRB5KDC_ERR_BAD_PVNO;
330 }
331
332 ap_rep.length = RSVAL(p, 0); p += 2;
333
334 if (p + ap_rep.length >= (char *)packet->data + packet->length) {
335 DEBUG(1,("ptr beyond end of packet from kpasswd server\n"));
336 return KRB5KRB_AP_ERR_MODIFIED;
337 }
338
339 if (ap_rep.length == 0) {
340 DEBUG(1,("got unencrypted setpw result?!\n"));
341 return KRB5KRB_AP_ERR_MODIFIED;
342 }
343
344 /* verify ap_rep */
345 ap_rep.data = p;
346 p += ap_rep.length;
347
348 ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc);
349 if (ret) {
350 DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret)));
351 return KRB5KRB_AP_ERR_MODIFIED;
352 }
353
354 krb5_free_ap_rep_enc_part(context, ap_rep_enc);
355
356 cipherresult.data = p;
357 cipherresult.length = ((char *)packet->data + packet->length) - p;
358
359 ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
360 &replay);
361 if (ret) {
362 DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret)));
363 return KRB5KRB_AP_ERR_MODIFIED;
364 }
365
366 if (clearresult.length < 2) {
367 free(clearresult.data);
368 ret = KRB5KRB_AP_ERR_MODIFIED;
369 return KRB5KRB_AP_ERR_MODIFIED;
370 }
371
372 p = clearresult.data;
373
374 res_code = RSVAL(p, 0);
375
376 free(clearresult.data);
377
378 if ((res_code < KRB5_KPASSWD_SUCCESS) ||
379 (res_code > KRB5_KPASSWD_ETYPE_NOSUPP)) {
380 return KRB5KRB_AP_ERR_MODIFIED;
381 }
382
383 if (res_code == KRB5_KPASSWD_SUCCESS) {
384 return 0;
385 } else {
386 const char *errstr;
387 setpw_result_code_string(context, res_code, &errstr);
388 DEBUG(1, ("Error changing password: %s (%d)\n", errstr, res_code));
389
390 return kpasswd_err_to_krb5_err(res_code);
391 }
392}
393
394static ADS_STATUS do_krb5_kpasswd_request(krb5_context context,
395 const char *kdc_host,
396 uint16 pversion,
397 krb5_creds *credsp,
398 const char *princ,
399 const char *newpw)
400{
401 krb5_auth_context auth_context = NULL;
402 krb5_data ap_req, chpw_req, chpw_rep;
403 int ret, sock;
404 socklen_t addr_len;
405 struct sockaddr remote_addr, local_addr;
406 struct in_addr *addr = interpret_addr2(kdc_host);
407 krb5_address local_kaddr, remote_kaddr;
408 BOOL use_tcp = False;
409
410
411 ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
412 NULL, credsp, &ap_req);
413 if (ret) {
414 DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret)));
415 return ADS_ERROR_KRB5(ret);
416 }
417
418 do {
419
420 if (!use_tcp) {
421
422 sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT);
423
424 } else {
425
426 sock = open_socket_out(SOCK_STREAM, addr, DEFAULT_KPASSWD_PORT,
427 LONG_CONNECT_TIMEOUT);
428 }
429
430 if (sock == -1) {
431 int rc = errno;
432 SAFE_FREE(ap_req.data);
433 krb5_auth_con_free(context, auth_context);
434 DEBUG(1,("failed to open kpasswd socket to %s (%s)\n",
435 kdc_host, strerror(errno)));
436 return ADS_ERROR_SYSTEM(rc);
437 }
438
439 addr_len = sizeof(remote_addr);
440 getpeername(sock, &remote_addr, &addr_len);
441 addr_len = sizeof(local_addr);
442 getsockname(sock, &local_addr, &addr_len);
443
444 setup_kaddr(&remote_kaddr, &remote_addr);
445 setup_kaddr(&local_kaddr, &local_addr);
446
447 ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL);
448 if (ret) {
449 close(sock);
450 SAFE_FREE(ap_req.data);
451 krb5_auth_con_free(context, auth_context);
452 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret)));
453 return ADS_ERROR_KRB5(ret);
454 }
455
456 ret = build_kpasswd_request(pversion, context, auth_context, &ap_req,
457 princ, newpw, use_tcp, &chpw_req);
458 if (ret) {
459 close(sock);
460 SAFE_FREE(ap_req.data);
461 krb5_auth_con_free(context, auth_context);
462 DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
463 return ADS_ERROR_KRB5(ret);
464 }
465
466 ret = write(sock, chpw_req.data, chpw_req.length);
467
468 if (ret != chpw_req.length) {
469 close(sock);
470 SAFE_FREE(chpw_req.data);
471 SAFE_FREE(ap_req.data);
472 krb5_auth_con_free(context, auth_context);
473 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
474 return ADS_ERROR_SYSTEM(errno);
475 }
476
477 SAFE_FREE(chpw_req.data);
478
479 chpw_rep.length = 1500;
480 chpw_rep.data = (char *) SMB_MALLOC(chpw_rep.length);
481 if (!chpw_rep.data) {
482 close(sock);
483 SAFE_FREE(ap_req.data);
484 krb5_auth_con_free(context, auth_context);
485 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
486 errno = ENOMEM;
487 return ADS_ERROR_SYSTEM(errno);
488 }
489
490 ret = read(sock, chpw_rep.data, chpw_rep.length);
491 if (ret < 0) {
492 close(sock);
493 SAFE_FREE(chpw_rep.data);
494 SAFE_FREE(ap_req.data);
495 krb5_auth_con_free(context, auth_context);
496 DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
497 return ADS_ERROR_SYSTEM(errno);
498 }
499
500 close(sock);
501 chpw_rep.length = ret;
502
503 ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr);
504 if (ret) {
505 SAFE_FREE(chpw_rep.data);
506 SAFE_FREE(ap_req.data);
507 krb5_auth_con_free(context, auth_context);
508 DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n",
509 error_message(ret)));
510 return ADS_ERROR_KRB5(ret);
511 }
512
513 ret = parse_setpw_reply(context, use_tcp, auth_context, &chpw_rep);
514 SAFE_FREE(chpw_rep.data);
515
516 if (ret) {
517
518 if (ret == KRB5KRB_ERR_RESPONSE_TOO_BIG && !use_tcp) {
519 DEBUG(5, ("Trying setpw with TCP!!!\n"));
520 use_tcp = True;
521 continue;
522 }
523
524 SAFE_FREE(ap_req.data);
525 krb5_auth_con_free(context, auth_context);
526 DEBUG(1,("parse_setpw_reply failed (%s)\n",
527 error_message(ret)));
528 return ADS_ERROR_KRB5(ret);
529 }
530
531 SAFE_FREE(ap_req.data);
532 krb5_auth_con_free(context, auth_context);
533 } while ( ret );
534
535 return ADS_SUCCESS;
536}
537
538ADS_STATUS ads_krb5_set_password(const char *kdc_host, const char *princ,
539 const char *newpw, int time_offset)
540{
541
542 ADS_STATUS aret;
543 krb5_error_code ret = 0;
544 krb5_context context = NULL;
545 krb5_principal principal = NULL;
546 char *princ_name = NULL;
547 char *realm = NULL;
548 krb5_creds creds, *credsp = NULL;
549#if KRB5_PRINC_REALM_RETURNS_REALM
550 krb5_realm orig_realm;
551#else
552 krb5_data orig_realm;
553#endif
554 krb5_ccache ccache = NULL;
555
556 ZERO_STRUCT(creds);
557
558 initialize_krb5_error_table();
559 ret = krb5_init_context(&context);
560 if (ret) {
561 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
562 return ADS_ERROR_KRB5(ret);
563 }
564
565 if (time_offset != 0) {
566 krb5_set_real_time(context, time(NULL) + time_offset, 0);
567 }
568
569 ret = krb5_cc_default(context, &ccache);
570 if (ret) {
571 krb5_free_context(context);
572 DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
573 return ADS_ERROR_KRB5(ret);
574 }
575
576 realm = strchr_m(princ, '@');
577 if (!realm) {
578 krb5_cc_close(context, ccache);
579 krb5_free_context(context);
580 DEBUG(1,("Failed to get realm\n"));
581 return ADS_ERROR_KRB5(-1);
582 }
583 realm++;
584
585 asprintf(&princ_name, "kadmin/changepw@%s", realm);
586 ret = smb_krb5_parse_name(context, princ_name, &creds.server);
587 if (ret) {
588 krb5_cc_close(context, ccache);
589 krb5_free_context(context);
590 DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
591 return ADS_ERROR_KRB5(ret);
592 }
593
594 /* parse the principal we got as a function argument */
595 ret = smb_krb5_parse_name(context, princ, &principal);
596 if (ret) {
597 krb5_cc_close(context, ccache);
598 krb5_free_principal(context, creds.server);
599 krb5_free_context(context);
600 DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
601 free(princ_name);
602 return ADS_ERROR_KRB5(ret);
603 }
604
605 free(princ_name);
606
607 /* The creds.server principal takes ownership of this memory.
608 Remember to set back to original value before freeing. */
609 orig_realm = *krb5_princ_realm(context, creds.server);
610 krb5_princ_set_realm(context, creds.server, krb5_princ_realm(context, principal));
611
612 ret = krb5_cc_get_principal(context, ccache, &creds.client);
613 if (ret) {
614 krb5_cc_close(context, ccache);
615 krb5_princ_set_realm(context, creds.server, &orig_realm);
616 krb5_free_principal(context, creds.server);
617 krb5_free_principal(context, principal);
618 krb5_free_context(context);
619 DEBUG(1,("Failed to get principal from ccache (%s)\n",
620 error_message(ret)));
621 return ADS_ERROR_KRB5(ret);
622 }
623
624 ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
625 if (ret) {
626 krb5_cc_close(context, ccache);
627 krb5_free_principal(context, creds.client);
628 krb5_princ_set_realm(context, creds.server, &orig_realm);
629 krb5_free_principal(context, creds.server);
630 krb5_free_principal(context, principal);
631 krb5_free_context(context);
632 DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
633 return ADS_ERROR_KRB5(ret);
634 }
635
636 /* we might have to call krb5_free_creds(...) from now on ... */
637
638 aret = do_krb5_kpasswd_request(context, kdc_host,
639 KRB5_KPASSWD_VERS_SETPW,
640 credsp, princ, newpw);
641
642 krb5_free_creds(context, credsp);
643 krb5_free_principal(context, creds.client);
644 krb5_princ_set_realm(context, creds.server, &orig_realm);
645 krb5_free_principal(context, creds.server);
646 krb5_free_principal(context, principal);
647 krb5_cc_close(context, ccache);
648 krb5_free_context(context);
649
650 return aret;
651}
652
653/*
654 we use a prompter to avoid a crash bug in the kerberos libs when
655 dealing with empty passwords
656 this prompter is just a string copy ...
657*/
658static krb5_error_code
659kerb_prompter(krb5_context ctx, void *data,
660 const char *name,
661 const char *banner,
662 int num_prompts,
663 krb5_prompt prompts[])
664{
665 if (num_prompts == 0) return 0;
666
667 memset(prompts[0].reply->data, 0, prompts[0].reply->length);
668 if (prompts[0].reply->length > 0) {
669 if (data) {
670 strncpy(prompts[0].reply->data,
671 (const char *)data,
672 prompts[0].reply->length-1);
673 prompts[0].reply->length = strlen(prompts[0].reply->data);
674 } else {
675 prompts[0].reply->length = 0;
676 }
677 }
678 return 0;
679}
680
681static ADS_STATUS ads_krb5_chg_password(const char *kdc_host,
682 const char *principal,
683 const char *oldpw,
684 const char *newpw,
685 int time_offset)
686{
687 ADS_STATUS aret;
688 krb5_error_code ret;
689 krb5_context context = NULL;
690 krb5_principal princ;
691 krb5_get_init_creds_opt opts;
692 krb5_creds creds;
693 char *chpw_princ = NULL, *password;
694
695 initialize_krb5_error_table();
696 ret = krb5_init_context(&context);
697 if (ret) {
698 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
699 return ADS_ERROR_KRB5(ret);
700 }
701
702 if ((ret = smb_krb5_parse_name(context, principal,
703 &princ))) {
704 krb5_free_context(context);
705 DEBUG(1,("Failed to parse %s (%s)\n", principal, error_message(ret)));
706 return ADS_ERROR_KRB5(ret);
707 }
708
709 krb5_get_init_creds_opt_init(&opts);
710 krb5_get_init_creds_opt_set_tkt_life(&opts, 5*60);
711 krb5_get_init_creds_opt_set_renew_life(&opts, 0);
712 krb5_get_init_creds_opt_set_forwardable(&opts, 0);
713 krb5_get_init_creds_opt_set_proxiable(&opts, 0);
714
715 /* We have to obtain an INITIAL changepw ticket for changing password */
716 asprintf(&chpw_princ, "kadmin/changepw@%s",
717 (char *) krb5_princ_realm(context, princ));
718 password = SMB_STRDUP(oldpw);
719 ret = krb5_get_init_creds_password(context, &creds, princ, password,
720 kerb_prompter, NULL,
721 0, chpw_princ, &opts);
722 SAFE_FREE(chpw_princ);
723 SAFE_FREE(password);
724
725 if (ret) {
726 if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
727 DEBUG(1,("Password incorrect while getting initial ticket"));
728 else
729 DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret)));
730
731 krb5_free_principal(context, princ);
732 krb5_free_context(context);
733 return ADS_ERROR_KRB5(ret);
734 }
735
736 aret = do_krb5_kpasswd_request(context, kdc_host,
737 KRB5_KPASSWD_VERS_CHANGEPW,
738 &creds, principal, newpw);
739
740 krb5_free_principal(context, princ);
741 krb5_free_context(context);
742
743 return aret;
744}
745
746
747ADS_STATUS kerberos_set_password(const char *kpasswd_server,
748 const char *auth_principal, const char *auth_password,
749 const char *target_principal, const char *new_password,
750 int time_offset)
751{
752 int ret;
753
754 if ((ret = kerberos_kinit_password(auth_principal, auth_password, time_offset, NULL))) {
755 DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal, error_message(ret)));
756 return ADS_ERROR_KRB5(ret);
757 }
758
759 if (!strcmp(auth_principal, target_principal))
760 return ads_krb5_chg_password(kpasswd_server, target_principal,
761 auth_password, new_password, time_offset);
762 else
763 return ads_krb5_set_password(kpasswd_server, target_principal,
764 new_password, time_offset);
765}
766
767
768/**
769 * Set the machine account password
770 * @param ads connection to ads server
771 * @param hostname machine whose password is being set
772 * @param password new password
773 * @return status of password change
774 **/
775ADS_STATUS ads_set_machine_password(ADS_STRUCT *ads,
776 const char *machine_account,
777 const char *password)
778{
779 ADS_STATUS status;
780 char *principal = NULL;
781
782 /*
783 we need to use the '$' form of the name here (the machine account name),
784 as otherwise the server might end up setting the password for a user
785 instead
786 */
787 asprintf(&principal, "%s@%s", machine_account, ads->config.realm);
788
789 status = ads_krb5_set_password(ads->auth.kdc_server, principal,
790 password, ads->auth.time_offset);
791
792 free(principal);
793
794 return status;
795}
796
797
798
799#endif
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