1 /* $NetBSD: changepw.c,v 1.1.1.2 2014/04/24 12:45:49 pettai Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * 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 #undef __attribute__
39 #define __attribute__(X)
40
41
42 static void
43 str2data (krb5_data *d,
44 const char *fmt,
45 ...) __attribute__ ((format (printf, 2, 3)));
46
47 static void
str2data(krb5_data * d,const char * fmt,...)48 str2data (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
69 static krb5_error_code
chgpw_send_request(krb5_context context,krb5_auth_context * auth_context,krb5_creds * creds,krb5_principal targprinc,int is_stream,rk_socket_t sock,const char * passwd,const char * host)70 chgpw_send_request (krb5_context context,
71 krb5_auth_context *auth_context,
72 krb5_creds *creds,
73 krb5_principal targprinc,
74 int is_stream,
75 rk_socket_t 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 (rk_IS_SOCKET_ERROR( sendmsg (sock, &msghdr, 0) )) {
145 ret = rk_SOCK_ERRNO;
146 krb5_set_error_message(context, ret, "sendmsg %s: %s",
147 host, strerror(ret));
148 }
149
150 krb5_data_free (&krb_priv_data);
151 out2:
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
161 static krb5_error_code
setpw_send_request(krb5_context context,krb5_auth_context * auth_context,krb5_creds * creds,krb5_principal targprinc,int is_stream,rk_socket_t sock,const char * passwd,const char * host)162 setpw_send_request (krb5_context context,
163 krb5_auth_context *auth_context,
164 krb5_creds *creds,
165 krb5_principal targprinc,
166 int is_stream,
167 rk_socket_t 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 = 0;
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 (rk_IS_SOCKET_ERROR( sendmsg (sock, &msghdr, 0) )) {
255 ret = rk_SOCK_ERRNO;
256 krb5_set_error_message(context, ret, "sendmsg %s: %s",
257 host, strerror(ret));
258 }
259
260 krb5_data_free (&krb_priv_data);
261 out2:
262 krb5_data_free (&ap_req_data);
263 krb5_data_free (&pwd_data);
264 return ret;
265 }
266
267 static krb5_error_code
process_reply(krb5_context context,krb5_auth_context auth_context,int is_stream,rk_socket_t sock,int * result_code,krb5_data * result_code_string,krb5_data * result_string,const char * host)268 process_reply (krb5_context context,
269 krb5_auth_context auth_context,
270 int is_stream,
271 rk_socket_t 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 size_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 (rk_IS_SOCKET_ERROR(ret)) {
292 save_errno = rk_SOCK_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 (rk_IS_SOCKET_ERROR(ret)) {
320 save_errno = rk_SOCK_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 "(%zu bytes)", host, 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
462 typedef krb5_error_code (*kpwd_send_request) (krb5_context,
463 krb5_auth_context *,
464 krb5_creds *,
465 krb5_principal,
466 int,
467 rk_socket_t,
468 const char *,
469 const char *);
470 typedef krb5_error_code (*kpwd_process_reply) (krb5_context,
471 krb5_auth_context,
472 int,
473 rk_socket_t,
474 int *,
475 krb5_data *,
476 krb5_data *,
477 const char *);
478
479 static 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, 0, NULL, NULL }
500 };
501
502 /*
503 *
504 */
505
506 static krb5_error_code
change_password_loop(krb5_context context,krb5_creds * creds,krb5_principal targprinc,const char * newpw,int * result_code,krb5_data * result_code_string,krb5_data * result_string,struct kpwd_proc * proc)507 change_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 rk_socket_t 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 (rk_IS_BAD_SOCKET(sock))
569 continue;
570 rk_cloexec(sock);
571
572 ret = connect(sock, a->ai_addr, a->ai_addrlen);
573 if (rk_IS_SOCKET_ERROR(ret)) {
574 rk_closesocket (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 rk_closesocket (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 rk_closesocket(sock);
602 goto out;
603 }
604 }
605
606 #ifndef NO_LIMIT_FD_SETSIZE
607 if (sock >= FD_SETSIZE) {
608 ret = ERANGE;
609 krb5_set_error_message(context, ret,
610 "fd %d too large", sock);
611 rk_closesocket (sock);
612 goto out;
613 }
614 #endif
615
616 FD_ZERO(&fdset);
617 FD_SET(sock, &fdset);
618 tv.tv_usec = 0;
619 tv.tv_sec = 1 + (1 << i);
620
621 ret = select (sock + 1, &fdset, NULL, NULL, &tv);
622 if (rk_IS_SOCKET_ERROR(ret) && rk_SOCK_ERRNO != EINTR) {
623 rk_closesocket(sock);
624 goto out;
625 }
626 if (ret == 1) {
627 ret = (*proc->process_rep) (context,
628 auth_context,
629 is_stream,
630 sock,
631 result_code,
632 result_code_string,
633 result_string,
634 hi->hostname);
635 if (ret == 0)
636 done = 1;
637 else if (i > 0 && ret == KRB5KRB_AP_ERR_MUT_FAIL)
638 replied = 1;
639 } else {
640 ret = KRB5_KDC_UNREACH;
641 }
642 }
643 rk_closesocket (sock);
644 }
645 }
646
647 out:
648 krb5_krbhst_free (context, handle);
649 krb5_auth_con_free (context, auth_context);
650
651 if (ret == KRB5_KDC_UNREACH) {
652 krb5_set_error_message(context,
653 ret,
654 N_("Unable to reach any changepw server "
655 " in realm %s", "realm"), realm);
656 *result_code = KRB5_KPASSWD_HARDERROR;
657 }
658 return ret;
659 }
660
661 #ifndef HEIMDAL_SMALLER
662
663 static struct kpwd_proc *
find_chpw_proto(const char * name)664 find_chpw_proto(const char *name)
665 {
666 struct kpwd_proc *p;
667 for (p = procs; p->name != NULL; p++) {
668 if (strcmp(p->name, name) == 0)
669 return p;
670 }
671 return NULL;
672 }
673
674 /**
675 * Deprecated: krb5_change_password() is deprecated, use krb5_set_password().
676 *
677 * @param context a Keberos context
678 * @param creds
679 * @param newpw
680 * @param result_code
681 * @param result_code_string
682 * @param result_string
683 *
684 * @return On sucess password is changed.
685
686 * @ingroup @krb5_deprecated
687 */
688
689 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_change_password(krb5_context context,krb5_creds * creds,const char * newpw,int * result_code,krb5_data * result_code_string,krb5_data * result_string)690 krb5_change_password (krb5_context context,
691 krb5_creds *creds,
692 const char *newpw,
693 int *result_code,
694 krb5_data *result_code_string,
695 krb5_data *result_string)
696 KRB5_DEPRECATED_FUNCTION("Use X instead")
697 {
698 struct kpwd_proc *p = find_chpw_proto("change password");
699
700 *result_code = KRB5_KPASSWD_MALFORMED;
701 result_code_string->data = result_string->data = NULL;
702 result_code_string->length = result_string->length = 0;
703
704 if (p == NULL)
705 return KRB5_KPASSWD_MALFORMED;
706
707 return change_password_loop(context, creds, NULL, newpw,
708 result_code, result_code_string,
709 result_string, p);
710 }
711 #endif /* HEIMDAL_SMALLER */
712
713 /**
714 * Change password using creds.
715 *
716 * @param context a Keberos context
717 * @param creds The initial kadmin/passwd for the principal or an admin principal
718 * @param newpw The new password to set
719 * @param targprinc if unset, the default principal is used.
720 * @param result_code Result code, KRB5_KPASSWD_SUCCESS is when password is changed.
721 * @param result_code_string binary message from the server, contains
722 * at least the result_code.
723 * @param result_string A message from the kpasswd service or the
724 * library in human printable form. The string is NUL terminated.
725 *
726 * @return On sucess and *result_code is KRB5_KPASSWD_SUCCESS, the password is changed.
727
728 * @ingroup @krb5
729 */
730
731 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_set_password(krb5_context context,krb5_creds * creds,const char * newpw,krb5_principal targprinc,int * result_code,krb5_data * result_code_string,krb5_data * result_string)732 krb5_set_password(krb5_context context,
733 krb5_creds *creds,
734 const char *newpw,
735 krb5_principal targprinc,
736 int *result_code,
737 krb5_data *result_code_string,
738 krb5_data *result_string)
739 {
740 krb5_principal principal = NULL;
741 krb5_error_code ret = 0;
742 int i;
743
744 *result_code = KRB5_KPASSWD_MALFORMED;
745 krb5_data_zero(result_code_string);
746 krb5_data_zero(result_string);
747
748 if (targprinc == NULL) {
749 ret = krb5_get_default_principal(context, &principal);
750 if (ret)
751 return ret;
752 } else
753 principal = targprinc;
754
755 for (i = 0; procs[i].name != NULL; i++) {
756 *result_code = 0;
757 ret = change_password_loop(context, creds, principal, newpw,
758 result_code, result_code_string,
759 result_string,
760 &procs[i]);
761 if (ret == 0 && *result_code == 0)
762 break;
763 }
764
765 if (targprinc == NULL)
766 krb5_free_principal(context, principal);
767 return ret;
768 }
769
770 /*
771 *
772 */
773
774 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_set_password_using_ccache(krb5_context context,krb5_ccache ccache,const char * newpw,krb5_principal targprinc,int * result_code,krb5_data * result_code_string,krb5_data * result_string)775 krb5_set_password_using_ccache(krb5_context context,
776 krb5_ccache ccache,
777 const char *newpw,
778 krb5_principal targprinc,
779 int *result_code,
780 krb5_data *result_code_string,
781 krb5_data *result_string)
782 {
783 krb5_creds creds, *credsp;
784 krb5_error_code ret;
785 krb5_principal principal = NULL;
786
787 *result_code = KRB5_KPASSWD_MALFORMED;
788 result_code_string->data = result_string->data = NULL;
789 result_code_string->length = result_string->length = 0;
790
791 memset(&creds, 0, sizeof(creds));
792
793 if (targprinc == NULL) {
794 ret = krb5_cc_get_principal(context, ccache, &principal);
795 if (ret)
796 return ret;
797 } else
798 principal = targprinc;
799
800 ret = krb5_make_principal(context, &creds.server,
801 krb5_principal_get_realm(context, principal),
802 "kadmin", "changepw", NULL);
803 if (ret)
804 goto out;
805
806 ret = krb5_cc_get_principal(context, ccache, &creds.client);
807 if (ret) {
808 krb5_free_principal(context, creds.server);
809 goto out;
810 }
811
812 ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
813 krb5_free_principal(context, creds.server);
814 krb5_free_principal(context, creds.client);
815 if (ret)
816 goto out;
817
818 ret = krb5_set_password(context,
819 credsp,
820 newpw,
821 principal,
822 result_code,
823 result_code_string,
824 result_string);
825
826 krb5_free_creds(context, credsp);
827
828 return ret;
829 out:
830 if (targprinc == NULL)
831 krb5_free_principal(context, principal);
832 return ret;
833 }
834
835 /*
836 *
837 */
838
839 KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
krb5_passwd_result_to_string(krb5_context context,int result)840 krb5_passwd_result_to_string (krb5_context context,
841 int result)
842 {
843 static const char *strings[] = {
844 "Success",
845 "Malformed",
846 "Hard error",
847 "Auth error",
848 "Soft error" ,
849 "Access denied",
850 "Bad version",
851 "Initial flag needed"
852 };
853
854 if (result < 0 || result > KRB5_KPASSWD_INITIAL_FLAG_NEEDED)
855 return "unknown result code";
856 else
857 return strings[result];
858 }
859