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)
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.
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.
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.
26 #define DEFAULT_KPASSWD_PORT 464
27 #define KRB5_KPASSWD_VERS_CHANGEPW 1
28 #define KRB5_KPASSWD_VERS_SETPW 2
29 #define KRB5_KPASSWD_VERS_SETPW_MS 0xff80
30 #define KRB5_KPASSWD_ACCESSDENIED 5
31 #define KRB5_KPASSWD_BAD_VERSION 6
32 #define KRB5_KPASSWD_INITIAL_FLAG_NEEDED 7
34 /* Those are defined by kerberos-set-passwd-02.txt and are probably
35 * not supported by M$ implementation */
36 #define KRB5_KPASSWD_POLICY_REJECT 8
37 #define KRB5_KPASSWD_BAD_PRINCIPAL 9
38 #define KRB5_KPASSWD_ETYPE_NOSUPP 10
40 /* This implements kerberos password change protocol as specified in
41 * kerb-chg-password-02.txt and kerberos-set-passwd-02.txt
42 * as well as microsoft version of the protocol
43 * as specified in kerberos-set-passwd-00.txt
45 static DATA_BLOB
encode_krb5_setpw(const char *principal
, const char *password
)
47 char* princ_part1
= NULL
;
48 char* princ_part2
= NULL
;
57 princ
= strdup(principal
);
59 if ((c
= strchr(princ
, '/')) == NULL
) {
69 if ((c
= strchr(c
, '@')) != NULL
) {
75 memset(&req
, 0, sizeof(req
));
77 asn1_push_tag(&req
, ASN1_SEQUENCE(0));
78 asn1_push_tag(&req
, ASN1_CONTEXT(0));
79 asn1_write_OctetString(&req
, password
, strlen(password
));
82 asn1_push_tag(&req
, ASN1_CONTEXT(1));
83 asn1_push_tag(&req
, ASN1_SEQUENCE(0));
85 asn1_push_tag(&req
, ASN1_CONTEXT(0));
86 asn1_write_Integer(&req
, 1);
89 asn1_push_tag(&req
, ASN1_CONTEXT(1));
90 asn1_push_tag(&req
, ASN1_SEQUENCE(0));
93 asn1_write_GeneralString(&req
, princ_part1
);
95 asn1_write_GeneralString(&req
, princ_part2
);
101 asn1_push_tag(&req
, ASN1_CONTEXT(2));
102 asn1_write_GeneralString(&req
, realm
);
106 ret
= data_blob(req
.data
, req
.length
);
114 static krb5_error_code
build_kpasswd_request(uint16 pversion
,
115 krb5_context context
,
116 krb5_auth_context auth_context
,
124 krb5_data encoded_setpw
;
125 krb5_replay_data replay
;
129 ret
= krb5_auth_con_setflags(context
,
130 auth_context
,KRB5_AUTH_CONTEXT_DO_SEQUENCE
);
132 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
133 error_message(ret
)));
137 /* handle protocol differences in chpw and setpw */
138 if (pversion
== KRB5_KPASSWD_VERS_CHANGEPW
)
139 setpw
= data_blob(passwd
, strlen(passwd
));
140 else if (pversion
== KRB5_KPASSWD_VERS_SETPW
||
141 pversion
== KRB5_KPASSWD_VERS_SETPW_MS
)
142 setpw
= encode_krb5_setpw(princ
, passwd
);
146 encoded_setpw
.data
= setpw
.data
;
147 encoded_setpw
.length
= setpw
.length
;
149 ret
= krb5_mk_priv(context
, auth_context
,
150 &encoded_setpw
, &cipherpw
, &replay
);
152 data_blob_free(&setpw
); /*from 'encode_krb5_setpw(...)' */
155 DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret
)));
159 packet
->data
= (char *)malloc(ap_req
->length
+ cipherpw
.length
+ 6);
163 /* see the RFC for details */
164 p
= ((char *)packet
->data
) + 2;
165 RSSVAL(p
, 0, pversion
);
167 RSSVAL(p
, 0, ap_req
->length
);
169 memcpy(p
, ap_req
->data
, ap_req
->length
);
171 memcpy(p
, cipherpw
.data
, cipherpw
.length
);
172 p
+= cipherpw
.length
;
173 packet
->length
= PTR_DIFF(p
,packet
->data
);
174 RSSVAL(packet
->data
, 0, packet
->length
);
176 free(cipherpw
.data
); /* from 'krb5_mk_priv(...)' */
181 static krb5_error_code
krb5_setpw_result_code_string(krb5_context context
,
185 switch (result_code
) {
186 case KRB5_KPASSWD_MALFORMED
:
187 *code_string
= "Malformed request error";
189 case KRB5_KPASSWD_HARDERROR
:
190 *code_string
= "Server error";
192 case KRB5_KPASSWD_AUTHERROR
:
193 *code_string
= "Authentication error";
195 case KRB5_KPASSWD_SOFTERROR
:
196 *code_string
= "Password change rejected";
198 case KRB5_KPASSWD_ACCESSDENIED
:
199 *code_string
= "Client does not have proper authorization";
201 case KRB5_KPASSWD_BAD_VERSION
:
202 *code_string
= "Protocol version not supported";
204 case KRB5_KPASSWD_INITIAL_FLAG_NEEDED
:
205 *code_string
= "Authorization ticket must have initial flag set";
207 case KRB5_KPASSWD_POLICY_REJECT
:
208 *code_string
= "Password rejected due to policy requirements";
210 case KRB5_KPASSWD_BAD_PRINCIPAL
:
211 *code_string
= "Target principal does not exist";
213 case KRB5_KPASSWD_ETYPE_NOSUPP
:
214 *code_string
= "Unsupported encryption type";
217 *code_string
= "Password change failed";
224 static krb5_error_code
parse_setpw_reply(krb5_context context
,
225 krb5_auth_context auth_context
,
230 int vnum
, ret
, res_code
;
231 krb5_data cipherresult
;
232 krb5_data clearresult
;
233 krb5_ap_rep_enc_part
*ap_rep_enc
;
234 krb5_replay_data replay
;
236 if (packet
->length
< 4) {
237 return KRB5KRB_AP_ERR_MODIFIED
;
242 if (((char *)packet
->data
)[0] == 0x7e || ((char *)packet
->data
)[0] == 0x5e) {
243 /* it's an error packet. We should parse it ... */
244 DEBUG(1,("Got error packet 0x%x from kpasswd server\n",
245 ((char *)packet
->data
)[0]));
246 return KRB5KRB_AP_ERR_MODIFIED
;
249 if (RSVAL(p
, 0) != packet
->length
) {
250 DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n",
251 RSVAL(p
, 0), packet
->length
));
252 return KRB5KRB_AP_ERR_MODIFIED
;
257 vnum
= RSVAL(p
, 0); p
+= 2;
259 /* FIXME: According to standard there is only one type of reply */
260 if (vnum
!= KRB5_KPASSWD_VERS_SETPW
&&
261 vnum
!= KRB5_KPASSWD_VERS_SETPW_MS
&&
262 vnum
!= KRB5_KPASSWD_VERS_CHANGEPW
) {
263 DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum
));
264 return KRB5KDC_ERR_BAD_PVNO
;
267 ap_rep
.length
= RSVAL(p
, 0); p
+= 2;
269 if (p
+ ap_rep
.length
>= (char *)packet
->data
+ packet
->length
) {
270 DEBUG(1,("ptr beyond end of packet from kpasswd server\n"));
271 return KRB5KRB_AP_ERR_MODIFIED
;
274 if (ap_rep
.length
== 0) {
275 DEBUG(1,("got unencrypted setpw result?!\n"));
276 return KRB5KRB_AP_ERR_MODIFIED
;
283 ret
= krb5_rd_rep(context
, auth_context
, &ap_rep
, &ap_rep_enc
);
285 DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret
)));
286 return KRB5KRB_AP_ERR_MODIFIED
;
289 krb5_free_ap_rep_enc_part(context
, ap_rep_enc
);
291 cipherresult
.data
= p
;
292 cipherresult
.length
= ((char *)packet
->data
+ packet
->length
) - p
;
294 ret
= krb5_rd_priv(context
, auth_context
, &cipherresult
, &clearresult
,
297 DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret
)));
298 return KRB5KRB_AP_ERR_MODIFIED
;
301 if (clearresult
.length
< 2) {
302 free(clearresult
.data
);
303 ret
= KRB5KRB_AP_ERR_MODIFIED
;
304 return KRB5KRB_AP_ERR_MODIFIED
;
307 p
= clearresult
.data
;
309 res_code
= RSVAL(p
, 0);
311 free(clearresult
.data
);
313 if ((res_code
< KRB5_KPASSWD_SUCCESS
) ||
314 (res_code
> KRB5_KPASSWD_ETYPE_NOSUPP
)) {
315 return KRB5KRB_AP_ERR_MODIFIED
;
318 if(res_code
== KRB5_KPASSWD_SUCCESS
)
322 krb5_setpw_result_code_string(context
, res_code
, &errstr
);
323 DEBUG(1, ("Error changing password: %s\n", errstr
));
326 case KRB5_KPASSWD_ACCESSDENIED
:
327 return KRB5KDC_ERR_BADOPTION
;
329 case KRB5_KPASSWD_INITIAL_FLAG_NEEDED
:
330 return KRB5KDC_ERR_BADOPTION
;
331 /* return KV5M_ALT_METHOD; MIT-only define */
333 case KRB5_KPASSWD_ETYPE_NOSUPP
:
334 return KRB5KDC_ERR_ETYPE_NOSUPP
;
336 case KRB5_KPASSWD_BAD_PRINCIPAL
:
337 return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN
;
339 case KRB5_KPASSWD_POLICY_REJECT
:
340 return KRB5KDC_ERR_POLICY
;
343 return KRB5KRB_ERR_GENERIC
;
349 static ADS_STATUS
do_krb5_kpasswd_request(krb5_context context
,
350 const char *kdc_host
,
356 krb5_auth_context auth_context
= NULL
;
357 krb5_data ap_req
, chpw_req
, chpw_rep
;
358 int ret
, sock
, addr_len
;
359 struct sockaddr remote_addr
, local_addr
;
360 krb5_address local_kaddr
, remote_kaddr
;
362 ret
= krb5_mk_req_extended(context
, &auth_context
, AP_OPTS_USE_SUBKEY
,
363 NULL
, credsp
, &ap_req
);
365 DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret
)));
366 return ADS_ERROR_KRB5(ret
);
369 sock
= open_udp_socket(kdc_host
, DEFAULT_KPASSWD_PORT
);
373 krb5_auth_con_free(context
, auth_context
);
374 DEBUG(1,("failed to open kpasswd socket to %s (%s)\n",
375 kdc_host
, strerror(errno
)));
376 return ADS_ERROR_SYSTEM(rc
);
379 addr_len
= sizeof(remote_addr
);
380 getpeername(sock
, &remote_addr
, &addr_len
);
381 addr_len
= sizeof(local_addr
);
382 getsockname(sock
, &local_addr
, &addr_len
);
384 setup_kaddr(&remote_kaddr
, &remote_addr
);
385 setup_kaddr(&local_kaddr
, &local_addr
);
387 ret
= krb5_auth_con_setaddrs(context
, auth_context
, &local_kaddr
, NULL
);
391 krb5_auth_con_free(context
, auth_context
);
392 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret
)));
393 return ADS_ERROR_KRB5(ret
);
396 ret
= build_kpasswd_request(pversion
, context
, auth_context
, &ap_req
,
397 princ
, newpw
, &chpw_req
);
401 krb5_auth_con_free(context
, auth_context
);
402 DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret
)));
403 return ADS_ERROR_KRB5(ret
);
406 if (write(sock
, chpw_req
.data
, chpw_req
.length
) != chpw_req
.length
) {
410 krb5_auth_con_free(context
, auth_context
);
411 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno
)));
412 return ADS_ERROR_SYSTEM(errno
);
417 chpw_rep
.length
= 1500;
418 chpw_rep
.data
= (char *) malloc(chpw_rep
.length
);
419 if (!chpw_rep
.data
) {
422 krb5_auth_con_free(context
, auth_context
);
423 DEBUG(1,("send of chpw failed (%s)\n", strerror(errno
)));
425 return ADS_ERROR_SYSTEM(errno
);
428 ret
= read(sock
, chpw_rep
.data
, chpw_rep
.length
);
433 krb5_auth_con_free(context
, auth_context
);
434 DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno
)));
435 return ADS_ERROR_SYSTEM(errno
);
439 chpw_rep
.length
= ret
;
441 ret
= krb5_auth_con_setaddrs(context
, auth_context
, NULL
,&remote_kaddr
);
445 krb5_auth_con_free(context
, auth_context
);
446 DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n",
447 error_message(ret
)));
448 return ADS_ERROR_KRB5(ret
);
451 ret
= parse_setpw_reply(context
, auth_context
, &chpw_rep
);
456 krb5_auth_con_free(context
, auth_context
);
457 DEBUG(1,("parse_setpw_reply failed (%s)\n",
458 error_message(ret
)));
459 return ADS_ERROR_KRB5(ret
);
463 krb5_auth_con_free(context
, auth_context
);
468 ADS_STATUS
krb5_set_password(const char *kdc_host
, const char *princ
, const char *newpw
,
474 krb5_context context
;
475 krb5_principal principal
;
478 krb5_creds creds
, *credsp
;
481 ret
= krb5_init_context(&context
);
483 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret
)));
484 return ADS_ERROR_KRB5(ret
);
487 if (time_offset
!= 0) {
488 krb5_set_real_time(context
, time(NULL
) + time_offset
, 0);
491 ret
= krb5_cc_default(context
, &ccache
);
493 krb5_free_context(context
);
494 DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret
)));
495 return ADS_ERROR_KRB5(ret
);
500 realm
= strchr(princ
, '@');
503 asprintf(&princ_name
, "kadmin/changepw@%s", realm
);
504 ret
= krb5_parse_name(context
, princ_name
, &creds
.server
);
506 krb5_free_context(context
);
507 DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret
)));
508 return ADS_ERROR_KRB5(ret
);
512 /* parse the principal we got as a function argument */
513 ret
= krb5_parse_name(context
, princ
, &principal
);
515 krb5_free_context(context
);
516 DEBUG(1,("Failed to parse %s (%s)\n", princ_name
, error_message(ret
)));
517 return ADS_ERROR_KRB5(ret
);
520 krb5_princ_set_realm(context
, creds
.server
,
521 krb5_princ_realm(context
, principal
));
523 ret
= krb5_cc_get_principal(context
, ccache
, &creds
.client
);
525 krb5_free_principal(context
, principal
);
526 krb5_free_context(context
);
527 DEBUG(1,("Failed to get principal from ccache (%s)\n",
528 error_message(ret
)));
529 return ADS_ERROR_KRB5(ret
);
532 ret
= krb5_get_credentials(context
, 0, ccache
, &creds
, &credsp
);
534 krb5_free_principal(context
, creds
.client
);
535 krb5_free_principal(context
, principal
);
536 krb5_free_context(context
);
537 DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret
)));
538 return ADS_ERROR_KRB5(ret
);
541 /* we might have to call krb5_free_creds(...) from now on ... */
543 aret
= do_krb5_kpasswd_request(context
, kdc_host
,
544 KRB5_KPASSWD_VERS_SETPW_MS
,
545 credsp
, princ
, newpw
);
547 krb5_free_creds(context
, credsp
);
548 krb5_free_principal(context
, creds
.client
);
549 krb5_free_principal(context
, creds
.server
);
550 krb5_free_principal(context
, principal
);
551 krb5_free_context(context
);
557 we use a prompter to avoid a crash bug in the kerberos libs when
558 dealing with empty passwords
559 this prompter is just a string copy ...
561 static krb5_error_code
562 kerb_prompter(krb5_context ctx
, void *data
,
566 krb5_prompt prompts
[])
568 if (num_prompts
== 0) return 0;
570 memset(prompts
[0].reply
->data
, 0, prompts
[0].reply
->length
);
571 if (prompts
[0].reply
->length
> 0) {
573 strncpy(prompts
[0].reply
->data
, data
, prompts
[0].reply
->length
-1);
574 prompts
[0].reply
->length
= strlen(prompts
[0].reply
->data
);
576 prompts
[0].reply
->length
= 0;
582 ADS_STATUS
krb5_chg_password(const char *kdc_host
,
583 const char *principal
,
590 krb5_context context
;
591 krb5_principal princ
;
592 krb5_get_init_creds_opt opts
;
594 char *chpw_princ
= NULL
, *password
;
596 ret
= krb5_init_context(&context
);
598 DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret
)));
599 return ADS_ERROR_KRB5(ret
);
602 if ((ret
= krb5_parse_name(context
, principal
,
604 krb5_free_context(context
);
605 DEBUG(1,("Failed to parse %s (%s)\n", principal
, error_message(ret
)));
606 return ADS_ERROR_KRB5(ret
);
609 krb5_get_init_creds_opt_init(&opts
);
610 krb5_get_init_creds_opt_set_tkt_life(&opts
, 5*60);
611 krb5_get_init_creds_opt_set_renew_life(&opts
, 0);
612 krb5_get_init_creds_opt_set_forwardable(&opts
, 0);
613 krb5_get_init_creds_opt_set_proxiable(&opts
, 0);
615 /* We have to obtain an INITIAL changepw ticket for changing password */
616 asprintf(&chpw_princ
, "kadmin/changepw@%s",
617 (char *) krb5_princ_realm(context
, princ
));
618 password
= strdup(oldpw
);
619 ret
= krb5_get_init_creds_password(context
, &creds
, princ
, password
,
621 0, chpw_princ
, &opts
);
622 SAFE_FREE(chpw_princ
);
626 if (ret
== KRB5KRB_AP_ERR_BAD_INTEGRITY
)
627 DEBUG(1,("Password incorrect while getting initial ticket"));
629 DEBUG(1,("krb5_get_init_creds_password failed (%s)\n", error_message(ret
)));
631 krb5_free_principal(context
, princ
);
632 krb5_free_context(context
);
633 return ADS_ERROR_KRB5(ret
);
636 aret
= do_krb5_kpasswd_request(context
, kdc_host
,
637 KRB5_KPASSWD_VERS_CHANGEPW
,
638 &creds
, principal
, newpw
);
640 krb5_free_principal(context
, princ
);
641 krb5_free_context(context
);
647 ADS_STATUS
kerberos_set_password(const char *kpasswd_server
,
648 const char *auth_principal
, const char *auth_password
,
649 const char *target_principal
, const char *new_password
,
654 if ((ret
= kerberos_kinit_password(auth_principal
, auth_password
, time_offset
))) {
655 DEBUG(1,("Failed kinit for principal %s (%s)\n", auth_principal
, error_message(ret
)));
656 return ADS_ERROR_KRB5(ret
);
659 if (!strcmp(auth_principal
, target_principal
))
660 return krb5_chg_password(kpasswd_server
, target_principal
,
661 auth_password
, new_password
, time_offset
);
663 return krb5_set_password(kpasswd_server
, target_principal
,
664 new_password
, time_offset
);
669 * Set the machine account password
670 * @param ads connection to ads server
671 * @param hostname machine whose password is being set
672 * @param password new password
673 * @return status of password change
675 ADS_STATUS
ads_set_machine_password(ADS_STRUCT
*ads
,
676 const char *hostname
,
677 const char *password
)
680 char *host
= strdup(hostname
);
686 we need to use the '$' form of the name here, as otherwise the
687 server might end up setting the password for a user instead
689 asprintf(&principal
, "%s$@%s", host
, ads
->auth
.realm
);
691 status
= krb5_set_password(ads
->auth
.kdc_server
, principal
, password
, ads
->auth
.time_offset
);