source: branches/samba-3.5.x/source4/heimdal/lib/krb5/changepw.c

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

Samba 3.5.0: Initial import
File size: 20.2 KB
Line 
1/*
2 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#define KRB5_DEPRECATED
35
36#include <krb5_locl.h>
37
38#undef __attribute__
39#define __attribute__(X)
40
41
42static void
43str2data (krb5_data *d,
44 const char *fmt,
45 ...) __attribute__ ((format (printf, 2, 3)));
46
47static void
48str2data (krb5_data *d,
49 const char *fmt,
50 ...)
51{
52 va_list args;
53 char *str;
54
55 va_start(args, fmt);
56 d->length = vasprintf (&str, fmt, args);
57 va_end(args);
58 d->data = str;
59}
60
61/*
62 * Change password protocol defined by
63 * draft-ietf-cat-kerb-chg-password-02.txt
64 *
65 * Share the response part of the protocol with MS set password
66 * (RFC3244)
67 */
68
69static krb5_error_code
70chgpw_send_request (krb5_context context,
71 krb5_auth_context *auth_context,
72 krb5_creds *creds,
73 krb5_principal targprinc,
74 int is_stream,
75 int sock,
76 const char *passwd,
77 const char *host)
78{
79 krb5_error_code ret;
80 krb5_data ap_req_data;
81 krb5_data krb_priv_data;
82 krb5_data passwd_data;
83 size_t len;
84 u_char header[6];
85 struct iovec iov[3];
86 struct msghdr msghdr;
87
88 if (is_stream)
89 return KRB5_KPASSWD_MALFORMED;
90
91 if (targprinc &&
92 krb5_principal_compare(context, creds->client, targprinc) != TRUE)
93 return KRB5_KPASSWD_MALFORMED;
94
95 krb5_data_zero (&ap_req_data);
96
97 ret = krb5_mk_req_extended (context,
98 auth_context,
99 AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
100 NULL, /* in_data */
101 creds,
102 &ap_req_data);
103 if (ret)
104 return ret;
105
106 passwd_data.data = rk_UNCONST(passwd);
107 passwd_data.length = strlen(passwd);
108
109 krb5_data_zero (&krb_priv_data);
110
111 ret = krb5_mk_priv (context,
112 *auth_context,
113 &passwd_data,
114 &krb_priv_data,
115 NULL);
116 if (ret)
117 goto out2;
118
119 len = 6 + ap_req_data.length + krb_priv_data.length;
120 header[0] = (len >> 8) & 0xFF;
121 header[1] = (len >> 0) & 0xFF;
122 header[2] = 0;
123 header[3] = 1;
124 header[4] = (ap_req_data.length >> 8) & 0xFF;
125 header[5] = (ap_req_data.length >> 0) & 0xFF;
126
127 memset(&msghdr, 0, sizeof(msghdr));
128 msghdr.msg_name = NULL;
129 msghdr.msg_namelen = 0;
130 msghdr.msg_iov = iov;
131 msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov);
132#if 0
133 msghdr.msg_control = NULL;
134 msghdr.msg_controllen = 0;
135#endif
136
137 iov[0].iov_base = (void*)header;
138 iov[0].iov_len = 6;
139 iov[1].iov_base = ap_req_data.data;
140 iov[1].iov_len = ap_req_data.length;
141 iov[2].iov_base = krb_priv_data.data;
142 iov[2].iov_len = krb_priv_data.length;
143
144 if (sendmsg (sock, &msghdr, 0) < 0) {
145 ret = errno;
146 krb5_set_error_message(context, ret, "sendmsg %s: %s",
147 host, strerror(ret));
148 }
149
150 krb5_data_free (&krb_priv_data);
151out2:
152 krb5_data_free (&ap_req_data);
153 return ret;
154}
155
156/*
157 * Set password protocol as defined by RFC3244 --
158 * Microsoft Windows 2000 Kerberos Change Password and Set Password Protocols
159 */
160
161static krb5_error_code
162setpw_send_request (krb5_context context,
163 krb5_auth_context *auth_context,
164 krb5_creds *creds,
165 krb5_principal targprinc,
166 int is_stream,
167 int sock,
168 const char *passwd,
169 const char *host)
170{
171 krb5_error_code ret;
172 krb5_data ap_req_data;
173 krb5_data krb_priv_data;
174 krb5_data pwd_data;
175 ChangePasswdDataMS chpw;
176 size_t len;
177 u_char header[4 + 6];
178 u_char *p;
179 struct iovec iov[3];
180 struct msghdr msghdr;
181
182 krb5_data_zero (&ap_req_data);
183
184 ret = krb5_mk_req_extended (context,
185 auth_context,
186 AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
187 NULL, /* in_data */
188 creds,
189 &ap_req_data);
190 if (ret)
191 return ret;
192
193 chpw.newpasswd.length = strlen(passwd);
194 chpw.newpasswd.data = rk_UNCONST(passwd);
195 if (targprinc) {
196 chpw.targname = &targprinc->name;
197 chpw.targrealm = &targprinc->realm;
198 } else {
199 chpw.targname = NULL;
200 chpw.targrealm = NULL;
201 }
202
203 ASN1_MALLOC_ENCODE(ChangePasswdDataMS, pwd_data.data, pwd_data.length,
204 &chpw, &len, ret);
205 if (ret) {
206 krb5_data_free (&ap_req_data);
207 return ret;
208 }
209
210 if(pwd_data.length != len)
211 krb5_abortx(context, "internal error in ASN.1 encoder");
212
213 ret = krb5_mk_priv (context,
214 *auth_context,
215 &pwd_data,
216 &krb_priv_data,
217 NULL);
218 if (ret)
219 goto out2;
220
221 len = 6 + ap_req_data.length + krb_priv_data.length;
222 p = header;
223 if (is_stream) {
224 _krb5_put_int(p, len, 4);
225 p += 4;
226 }
227 *p++ = (len >> 8) & 0xFF;
228 *p++ = (len >> 0) & 0xFF;
229 *p++ = 0xff;
230 *p++ = 0x80;
231 *p++ = (ap_req_data.length >> 8) & 0xFF;
232 *p = (ap_req_data.length >> 0) & 0xFF;
233
234 memset(&msghdr, 0, sizeof(msghdr));
235 msghdr.msg_name = NULL;
236 msghdr.msg_namelen = 0;
237 msghdr.msg_iov = iov;
238 msghdr.msg_iovlen = sizeof(iov)/sizeof(*iov);
239#if 0
240 msghdr.msg_control = NULL;
241 msghdr.msg_controllen = 0;
242#endif
243
244 iov[0].iov_base = (void*)header;
245 if (is_stream)
246 iov[0].iov_len = 10;
247 else
248 iov[0].iov_len = 6;
249 iov[1].iov_base = ap_req_data.data;
250 iov[1].iov_len = ap_req_data.length;
251 iov[2].iov_base = krb_priv_data.data;
252 iov[2].iov_len = krb_priv_data.length;
253
254 if (sendmsg (sock, &msghdr, 0) < 0) {
255 ret = errno;
256 krb5_set_error_message(context, ret, "sendmsg %s: %s",
257 host, strerror(ret));
258 }
259
260 krb5_data_free (&krb_priv_data);
261out2:
262 krb5_data_free (&ap_req_data);
263 krb5_data_free (&pwd_data);
264 return ret;
265}
266
267static krb5_error_code
268process_reply (krb5_context context,
269 krb5_auth_context auth_context,
270 int is_stream,
271 int sock,
272 int *result_code,
273 krb5_data *result_code_string,
274 krb5_data *result_string,
275 const char *host)
276{
277 krb5_error_code ret;
278 u_char reply[1024 * 3];
279 ssize_t len;
280 uint16_t pkt_len, pkt_ver;
281 krb5_data ap_rep_data;
282 int save_errno;
283
284 len = 0;
285 if (is_stream) {
286 while (len < sizeof(reply)) {
287 unsigned long size;
288
289 ret = recvfrom (sock, reply + len, sizeof(reply) - len,
290 0, NULL, NULL);
291 if (ret < 0) {
292 save_errno = errno;
293 krb5_set_error_message(context, save_errno,
294 "recvfrom %s: %s",
295 host, strerror(save_errno));
296 return save_errno;
297 } else if (ret == 0) {
298 krb5_set_error_message(context, 1,"recvfrom timeout %s", host);
299 return 1;
300 }
301 len += ret;
302 if (len < 4)
303 continue;
304 _krb5_get_int(reply, &size, 4);
305 if (size + 4 < len)
306 continue;
307 memmove(reply, reply + 4, size);
308 len = size;
309 break;
310 }
311 if (len == sizeof(reply)) {
312 krb5_set_error_message(context, ENOMEM,
313 N_("Message too large from %s", "host"),
314 host);
315 return ENOMEM;
316 }
317 } else {
318 ret = recvfrom (sock, reply, sizeof(reply), 0, NULL, NULL);
319 if (ret < 0) {
320 save_errno = errno;
321 krb5_set_error_message(context, save_errno,
322 "recvfrom %s: %s",
323 host, strerror(save_errno));
324 return save_errno;
325 }
326 len = ret;
327 }
328
329 if (len < 6) {
330 str2data (result_string, "server %s sent to too short message "
331 "(%ld bytes)", host, (long)len);
332 *result_code = KRB5_KPASSWD_MALFORMED;
333 return 0;
334 }
335
336 pkt_len = (reply[0] << 8) | (reply[1]);
337 pkt_ver = (reply[2] << 8) | (reply[3]);
338
339 if ((pkt_len != len) || (reply[1] == 0x7e || reply[1] == 0x5e)) {
340 KRB_ERROR error;
341 size_t size;
342 u_char *p;
343
344 memset(&error, 0, sizeof(error));
345
346 ret = decode_KRB_ERROR(reply, len, &error, &size);
347 if (ret)
348 return ret;
349
350 if (error.e_data->length < 2) {
351 str2data(result_string, "server %s sent too short "
352 "e_data to print anything usable", host);
353 free_KRB_ERROR(&error);
354 *result_code = KRB5_KPASSWD_MALFORMED;
355 return 0;
356 }
357
358 p = error.e_data->data;
359 *result_code = (p[0] << 8) | p[1];
360 if (error.e_data->length == 2)
361 str2data(result_string, "server only sent error code");
362 else
363 krb5_data_copy (result_string,
364 p + 2,
365 error.e_data->length - 2);
366 free_KRB_ERROR(&error);
367 return 0;
368 }
369
370 if (pkt_len != len) {
371 str2data (result_string, "client: wrong len in reply");
372 *result_code = KRB5_KPASSWD_MALFORMED;
373 return 0;
374 }
375 if (pkt_ver != KRB5_KPASSWD_VERS_CHANGEPW) {
376 str2data (result_string,
377 "client: wrong version number (%d)", pkt_ver);
378 *result_code = KRB5_KPASSWD_MALFORMED;
379 return 0;
380 }
381
382 ap_rep_data.data = reply + 6;
383 ap_rep_data.length = (reply[4] << 8) | (reply[5]);
384
385 if (reply + len < (u_char *)ap_rep_data.data + ap_rep_data.length) {
386 str2data (result_string, "client: wrong AP len in reply");
387 *result_code = KRB5_KPASSWD_MALFORMED;
388 return 0;
389 }
390
391 if (ap_rep_data.length) {
392 krb5_ap_rep_enc_part *ap_rep;
393 krb5_data priv_data;
394 u_char *p;
395
396 priv_data.data = (u_char*)ap_rep_data.data + ap_rep_data.length;
397 priv_data.length = len - ap_rep_data.length - 6;
398
399 ret = krb5_rd_rep (context,
400 auth_context,
401 &ap_rep_data,
402 &ap_rep);
403 if (ret)
404 return ret;
405
406 krb5_free_ap_rep_enc_part (context, ap_rep);
407
408 ret = krb5_rd_priv (context,
409 auth_context,
410 &priv_data,
411 result_code_string,
412 NULL);
413 if (ret) {
414 krb5_data_free (result_code_string);
415 return ret;
416 }
417
418 if (result_code_string->length < 2) {
419 *result_code = KRB5_KPASSWD_MALFORMED;
420 str2data (result_string,
421 "client: bad length in result");
422 return 0;
423 }
424
425 p = result_code_string->data;
426
427 *result_code = (p[0] << 8) | p[1];
428 krb5_data_copy (result_string,
429 (unsigned char*)result_code_string->data + 2,
430 result_code_string->length - 2);
431 return 0;
432 } else {
433 KRB_ERROR error;
434 size_t size;
435 u_char *p;
436
437 ret = decode_KRB_ERROR(reply + 6, len - 6, &error, &size);
438 if (ret) {
439 return ret;
440 }
441 if (error.e_data->length < 2) {
442 krb5_warnx (context, "too short e_data to print anything usable");
443 return 1; /* XXX */
444 }
445
446 p = error.e_data->data;
447 *result_code = (p[0] << 8) | p[1];
448 krb5_data_copy (result_string,
449 p + 2,
450 error.e_data->length - 2);
451 return 0;
452 }
453}
454
455
456/*
457 * change the password using the credentials in `creds' (for the
458 * principal indicated in them) to `newpw', storing the result of
459 * the operation in `result_*' and an error code or 0.
460 */
461
462typedef krb5_error_code (*kpwd_send_request) (krb5_context,
463 krb5_auth_context *,
464 krb5_creds *,
465 krb5_principal,
466 int,
467 int,
468 const char *,
469 const char *);
470typedef krb5_error_code (*kpwd_process_reply) (krb5_context,
471 krb5_auth_context,
472 int,
473 int,
474 int *,
475 krb5_data *,
476 krb5_data *,
477 const char *);
478
479static struct kpwd_proc {
480 const char *name;
481 int flags;
482#define SUPPORT_TCP 1
483#define SUPPORT_UDP 2
484 kpwd_send_request send_req;
485 kpwd_process_reply process_rep;
486} procs[] = {
487 {
488 "MS set password",
489 SUPPORT_TCP|SUPPORT_UDP,
490 setpw_send_request,
491 process_reply
492 },
493 {
494 "change password",
495 SUPPORT_UDP,
496 chgpw_send_request,
497 process_reply
498 },
499 { NULL }
500};
501
502/*
503 *
504 */
505
506static krb5_error_code
507change_password_loop (krb5_context context,
508 krb5_creds *creds,
509 krb5_principal targprinc,
510 const char *newpw,
511 int *result_code,
512 krb5_data *result_code_string,
513 krb5_data *result_string,
514 struct kpwd_proc *proc)
515{
516 krb5_error_code ret;
517 krb5_auth_context auth_context = NULL;
518 krb5_krbhst_handle handle = NULL;
519 krb5_krbhst_info *hi;
520 int sock;
521 unsigned int i;
522 int done = 0;
523 krb5_realm realm;
524
525 if (targprinc)
526 realm = targprinc->realm;
527 else
528 realm = creds->client->realm;
529
530 ret = krb5_auth_con_init (context, &auth_context);
531 if (ret)
532 return ret;
533
534 krb5_auth_con_setflags (context, auth_context,
535 KRB5_AUTH_CONTEXT_DO_SEQUENCE);
536
537 ret = krb5_krbhst_init (context, realm, KRB5_KRBHST_CHANGEPW, &handle);
538 if (ret)
539 goto out;
540
541 while (!done && (ret = krb5_krbhst_next(context, handle, &hi)) == 0) {
542 struct addrinfo *ai, *a;
543 int is_stream;
544
545 switch (hi->proto) {
546 case KRB5_KRBHST_UDP:
547 if ((proc->flags & SUPPORT_UDP) == 0)
548 continue;
549 is_stream = 0;
550 break;
551 case KRB5_KRBHST_TCP:
552 if ((proc->flags & SUPPORT_TCP) == 0)
553 continue;
554 is_stream = 1;
555 break;
556 default:
557 continue;
558 }
559
560 ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
561 if (ret)
562 continue;
563
564 for (a = ai; !done && a != NULL; a = a->ai_next) {
565 int replied = 0;
566
567 sock = socket (a->ai_family, a->ai_socktype | SOCK_CLOEXEC, a->ai_protocol);
568 if (sock < 0)
569 continue;
570 rk_cloexec(sock);
571
572 ret = connect(sock, a->ai_addr, a->ai_addrlen);
573 if (ret < 0) {
574 close (sock);
575 goto out;
576 }
577
578 ret = krb5_auth_con_genaddrs (context, auth_context, sock,
579 KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR);
580 if (ret) {
581 close (sock);
582 goto out;
583 }
584
585 for (i = 0; !done && i < 5; ++i) {
586 fd_set fdset;
587 struct timeval tv;
588
589 if (!replied) {
590 replied = 0;
591
592 ret = (*proc->send_req) (context,
593 &auth_context,
594 creds,
595 targprinc,
596 is_stream,
597 sock,
598 newpw,
599 hi->hostname);
600 if (ret) {
601 close(sock);
602 goto out;
603 }
604 }
605
606 if (sock >= FD_SETSIZE) {
607 ret = ERANGE;
608 krb5_set_error_message(context, ret,
609 "fd %d too large", sock);
610 close (sock);
611 goto out;
612 }
613
614 FD_ZERO(&fdset);
615 FD_SET(sock, &fdset);
616 tv.tv_usec = 0;
617 tv.tv_sec = 1 + (1 << i);
618
619 ret = select (sock + 1, &fdset, NULL, NULL, &tv);
620 if (ret < 0 && errno != EINTR) {
621 close(sock);
622 goto out;
623 }
624 if (ret == 1) {
625 ret = (*proc->process_rep) (context,
626 auth_context,
627 is_stream,
628 sock,
629 result_code,
630 result_code_string,
631 result_string,
632 hi->hostname);
633 if (ret == 0)
634 done = 1;
635 else if (i > 0 && ret == KRB5KRB_AP_ERR_MUT_FAIL)
636 replied = 1;
637 } else {
638 ret = KRB5_KDC_UNREACH;
639 }
640 }
641 close (sock);
642 }
643 }
644
645 out:
646 krb5_krbhst_free (context, handle);
647 krb5_auth_con_free (context, auth_context);
648
649 if (ret == KRB5_KDC_UNREACH) {
650 krb5_set_error_message(context,
651 ret,
652 N_("Unable to reach any changepw server "
653 " in realm %s", "realm"), realm);
654 *result_code = KRB5_KPASSWD_HARDERROR;
655 }
656 return ret;
657}
658
659#ifndef HEIMDAL_SMALLER
660
661static struct kpwd_proc *
662find_chpw_proto(const char *name)
663{
664 struct kpwd_proc *p;
665 for (p = procs; p->name != NULL; p++) {
666 if (strcmp(p->name, name) == 0)
667 return p;
668 }
669 return NULL;
670}
671
672/**
673 * krb5_change_password() is deprecated, use krb5_set_password().
674 *
675 * @param context a Keberos context
676 * @param creds
677 * @param newpw
678 * @param result_code
679 * @param result_code_string
680 * @param result_string
681 *
682 * @return On sucess password is changed.
683
684 * @ingroup @krb5_deprecated
685 */
686
687krb5_error_code KRB5_LIB_FUNCTION
688krb5_change_password (krb5_context context,
689 krb5_creds *creds,
690 const char *newpw,
691 int *result_code,
692 krb5_data *result_code_string,
693 krb5_data *result_string)
694 KRB5_DEPRECATED
695{
696 struct kpwd_proc *p = find_chpw_proto("change password");
697
698 *result_code = KRB5_KPASSWD_MALFORMED;
699 result_code_string->data = result_string->data = NULL;
700 result_code_string->length = result_string->length = 0;
701
702 if (p == NULL)
703 return KRB5_KPASSWD_MALFORMED;
704
705 return change_password_loop(context, creds, NULL, newpw,
706 result_code, result_code_string,
707 result_string, p);
708}
709#endif /* HEIMDAL_SMALLER */
710
711/**
712 * Change password using creds.
713 *
714 * @param context a Keberos context
715 * @param creds The initial kadmin/passwd for the principal or an admin principal
716 * @param newpw The new password to set
717 * @param targprinc if unset, the default principal is used.
718 * @param result_code Result code, KRB5_KPASSWD_SUCCESS is when password is changed.
719 * @param result_code_string binary message from the server, contains
720 * at least the result_code.
721 * @param result_string A message from the kpasswd service or the
722 * library in human printable form. The string is NUL terminated.
723 *
724 * @return On sucess and *result_code is KRB5_KPASSWD_SUCCESS, the password is changed.
725
726 * @ingroup @krb5
727 */
728
729krb5_error_code KRB5_LIB_FUNCTION
730krb5_set_password(krb5_context context,
731 krb5_creds *creds,
732 const char *newpw,
733 krb5_principal targprinc,
734 int *result_code,
735 krb5_data *result_code_string,
736 krb5_data *result_string)
737{
738 krb5_principal principal = NULL;
739 krb5_error_code ret = 0;
740 int i;
741
742 *result_code = KRB5_KPASSWD_MALFORMED;
743 krb5_data_zero(result_code_string);
744 krb5_data_zero(result_string);
745
746 if (targprinc == NULL) {
747 ret = krb5_get_default_principal(context, &principal);
748 if (ret)
749 return ret;
750 } else
751 principal = targprinc;
752
753 for (i = 0; procs[i].name != NULL; i++) {
754 *result_code = 0;
755 ret = change_password_loop(context, creds, principal, newpw,
756 result_code, result_code_string,
757 result_string,
758 &procs[i]);
759 if (ret == 0 && *result_code == 0)
760 break;
761 }
762
763 if (targprinc == NULL)
764 krb5_free_principal(context, principal);
765 return ret;
766}
767
768/*
769 *
770 */
771
772krb5_error_code KRB5_LIB_FUNCTION
773krb5_set_password_using_ccache(krb5_context context,
774 krb5_ccache ccache,
775 const char *newpw,
776 krb5_principal targprinc,
777 int *result_code,
778 krb5_data *result_code_string,
779 krb5_data *result_string)
780{
781 krb5_creds creds, *credsp;
782 krb5_error_code ret;
783 krb5_principal principal = NULL;
784
785 *result_code = KRB5_KPASSWD_MALFORMED;
786 result_code_string->data = result_string->data = NULL;
787 result_code_string->length = result_string->length = 0;
788
789 memset(&creds, 0, sizeof(creds));
790
791 if (targprinc == NULL) {
792 ret = krb5_cc_get_principal(context, ccache, &principal);
793 if (ret)
794 return ret;
795 } else
796 principal = targprinc;
797
798 ret = krb5_make_principal(context, &creds.server,
799 krb5_principal_get_realm(context, principal),
800 "kadmin", "changepw", NULL);
801 if (ret)
802 goto out;
803
804 ret = krb5_cc_get_principal(context, ccache, &creds.client);
805 if (ret) {
806 krb5_free_principal(context, creds.server);
807 goto out;
808 }
809
810 ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
811 krb5_free_principal(context, creds.server);
812 krb5_free_principal(context, creds.client);
813 if (ret)
814 goto out;
815
816 ret = krb5_set_password(context,
817 credsp,
818 newpw,
819 principal,
820 result_code,
821 result_code_string,
822 result_string);
823
824 krb5_free_creds(context, credsp);
825
826 return ret;
827 out:
828 if (targprinc == NULL)
829 krb5_free_principal(context, principal);
830 return ret;
831}
832
833/*
834 *
835 */
836
837const char* KRB5_LIB_FUNCTION
838krb5_passwd_result_to_string (krb5_context context,
839 int result)
840{
841 static const char *strings[] = {
842 "Success",
843 "Malformed",
844 "Hard error",
845 "Auth error",
846 "Soft error" ,
847 "Access denied",
848 "Bad version",
849 "Initial flag needed"
850 };
851
852 if (result < 0 || result > KRB5_KPASSWD_INITIAL_FLAG_NEEDED)
853 return "unknown result code";
854 else
855 return strings[result];
856}
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