2 * Unix SMB/CIFS implementation.
3 * Routines to operate on various trust relationships
4 * Copyright (C) Andrew Bartlett 2001
5 * Copyright (C) Rafal Szczesniak 2003
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.
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, see <http://www.gnu.org/licenses/>.
22 #include "../libcli/auth/libcli_auth.h"
23 #include "../libcli/auth/netlogon_creds_cli.h"
24 #include "rpc_client/cli_netlogon.h"
25 #include "rpc_client/cli_pipe.h"
26 #include "../librpc/gen_ndr/ndr_netlogon.h"
27 #include "librpc/gen_ndr/secrets.h"
30 #include "libsmb/libsmb.h"
31 #include "source3/include/messages.h"
32 #include "source3/include/g_lock.h"
33 #include "lib/util/util_tdb.h"
35 /*********************************************************
36 Change the domain password on the PDC.
37 Do most of the legwork ourselves. Caller must have
38 already setup the connection to the NETLOGON pipe
39 **********************************************************/
41 struct trust_pw_change_state
{
42 struct g_lock_ctx
*g_ctx
;
46 static int trust_pw_change_state_destructor(struct trust_pw_change_state
*state
)
48 g_lock_unlock(state
->g_ctx
,
49 string_term_tdb_data(state
->g_lock_key
));
53 char *trust_pw_new_value(TALLOC_CTX
*mem_ctx
,
54 enum netr_SchannelType sec_channel_type
,
58 * use secure defaults, which match
59 * what windows uses for computer passwords.
61 * We used to have min=128 and max=255 here, but
62 * it's a bad idea because of bugs in the Windows
63 * RODC/RWDC PasswordUpdateForward handling via
66 * See https://bugzilla.samba.org/show_bug.cgi?id=14984
71 switch (sec_channel_type
) {
74 if (security
== SEC_DOMAIN
) {
76 * The maximum length of a trust account password.
77 * Used when we randomly create it, 15 char passwords
78 * exceed NT4's max password length.
84 case SEC_CHAN_DNS_DOMAIN
:
86 * new_len * 2 = 498 bytes is the largest possible length
87 * NL_PASSWORD_VERSION consumes the rest of the possible 512 bytes
88 * and a confounder with at least 2 bytes is required.
90 * Windows uses new_len = 120 => 240 bytes (utf16)
97 * The maximum length of a trust account password.
98 * Used when we randomly create it, 15 char passwords
99 * exceed NT4's max password length.
109 * Create a random machine account password
110 * We create a random buffer and convert that to utf8.
111 * This is similar to what windows is doing.
113 return generate_random_machine_password(mem_ctx
, min
, max
);
117 * Temporary function to wrap cli_auth in a lck
120 static NTSTATUS
netlogon_creds_cli_lck_auth(
121 struct netlogon_creds_cli_context
*context
,
122 struct dcerpc_binding_handle
*b
,
123 uint8_t num_nt_hashes
,
124 const struct samr_Password
* const *nt_hashes
,
125 uint8_t *idx_nt_hashes
)
127 struct netlogon_creds_cli_lck
*lck
;
130 status
= netlogon_creds_cli_lck(
131 context
, NETLOGON_CREDS_CLI_LCK_EXCLUSIVE
,
133 if (!NT_STATUS_IS_OK(status
)) {
134 DBG_WARNING("netlogon_creds_cli_lck failed: %s\n",
139 status
= netlogon_creds_cli_auth(context
, b
, num_nt_hashes
, nt_hashes
,
146 NTSTATUS
trust_pw_change(struct netlogon_creds_cli_context
*context
,
147 struct messaging_context
*msg_ctx
,
148 struct dcerpc_binding_handle
*b
,
153 TALLOC_CTX
*frame
= talloc_stackframe();
154 const char *context_name
= NULL
;
155 struct trust_pw_change_state
*state
;
156 struct cli_credentials
*creds
= NULL
;
157 struct secrets_domain_info1
*info
= NULL
;
158 struct secrets_domain_info1_change
*prev
= NULL
;
159 const struct samr_Password
*current_nt_hash
= NULL
;
160 const struct samr_Password
*previous_nt_hash
= NULL
;
161 uint8_t num_nt_hashes
= 0;
163 const struct samr_Password
*nt_hashes
[1+3] = { NULL
, };
164 uint8_t idx_nt_hashes
= 0;
165 uint8_t idx_current
= UINT8_MAX
;
166 enum netr_SchannelType sec_channel_type
= SEC_CHAN_NULL
;
167 time_t pass_last_set_time
;
168 uint32_t old_version
= 0;
169 struct pdb_trusted_domain
*td
= NULL
;
170 struct timeval g_timeout
= { 0, };
172 struct timeval tv
= { 0, };
173 char *new_trust_pw_str
= NULL
;
175 DATA_BLOB new_trust_pw_blob
= data_blob_null
;
176 uint32_t new_version
= 0;
177 uint32_t *new_trust_version
= NULL
;
181 state
= talloc_zero(frame
, struct trust_pw_change_state
);
184 return NT_STATUS_NO_MEMORY
;
187 state
->g_ctx
= g_lock_ctx_init(state
, msg_ctx
);
188 if (state
->g_ctx
== NULL
) {
190 return NT_STATUS_NO_MEMORY
;
193 state
->g_lock_key
= talloc_asprintf(state
,
194 "trust_password_change_%s",
196 if (state
->g_lock_key
== NULL
) {
198 return NT_STATUS_NO_MEMORY
;
201 g_timeout
= timeval_current_ofs(10, 0);
202 status
= g_lock_lock(state
->g_ctx
,
203 string_term_tdb_data(state
->g_lock_key
),
204 G_LOCK_WRITE
, g_timeout
, NULL
, NULL
);
205 if (!NT_STATUS_IS_OK(status
)) {
206 DEBUG(1, ("could not get g_lock on [%s]!\n",
212 talloc_set_destructor(state
, trust_pw_change_state_destructor
);
214 status
= pdb_get_trust_credentials(domain
, NULL
, frame
, &creds
);
215 if (!NT_STATUS_IS_OK(status
)) {
216 DEBUG(0, ("could not fetch domain creds for domain %s - %s!\n",
217 domain
, nt_errstr(status
)));
219 return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE
;
222 current_nt_hash
= cli_credentials_get_nt_hash(creds
, frame
);
223 if (current_nt_hash
== NULL
) {
224 DEBUG(0, ("cli_credentials_get_nt_hash failed for domain %s!\n",
227 return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE
;
229 previous_nt_hash
= cli_credentials_get_old_nt_hash(creds
, frame
);
231 old_version
= cli_credentials_get_kvno(creds
);
232 pass_last_set_time
= cli_credentials_get_password_last_changed_time(creds
);
233 sec_channel_type
= cli_credentials_get_secure_channel_type(creds
);
235 new_version
= old_version
+ 1;
237 switch (sec_channel_type
) {
241 case SEC_CHAN_DNS_DOMAIN
:
242 case SEC_CHAN_DOMAIN
:
243 status
= pdb_get_trusted_domain(frame
, domain
, &td
);
244 if (!NT_STATUS_IS_OK(status
)) {
245 DEBUG(0, ("pdb_get_trusted_domain() failed for domain %s - %s!\n",
246 domain
, nt_errstr(status
)));
251 new_trust_version
= &new_version
;
255 return NT_STATUS_NOT_SUPPORTED
;
258 timeout
= lp_machine_password_timeout();
261 DEBUG(10,("machine password never expires\n"));
267 tv
.tv_sec
= pass_last_set_time
;
268 DEBUG(10, ("password last changed %s\n",
269 timeval_string(talloc_tos(), &tv
, false)));
270 tv
.tv_sec
+= timeout
;
271 DEBUGADD(10, ("password valid until %s\n",
272 timeval_string(talloc_tos(), &tv
, false)));
274 if (!force
&& !timeval_expired(&tv
)) {
279 context_name
= netlogon_creds_cli_debug_string(context
, talloc_tos());
280 if (context_name
== NULL
) {
282 return NT_STATUS_NO_MEMORY
;
286 * Create a random machine account password
287 * We create a random buffer and convert that to utf8.
288 * This is similar to what windows is doing.
290 new_trust_pw_str
= trust_pw_new_value(frame
, sec_channel_type
,
292 if (new_trust_pw_str
== NULL
) {
293 DEBUG(0, ("trust_pw_new_value() failed\n"));
295 return NT_STATUS_NO_MEMORY
;
298 len
= strlen(new_trust_pw_str
);
299 ok
= convert_string_talloc(frame
, CH_UNIX
, CH_UTF16
,
300 new_trust_pw_str
, len
,
301 (void **)&new_trust_pw_blob
.data
,
302 &new_trust_pw_blob
.length
);
304 status
= NT_STATUS_UNMAPPABLE_CHARACTER
;
305 if (errno
== ENOMEM
) {
306 status
= NT_STATUS_NO_MEMORY
;
308 DBG_ERR("convert_string_talloc(CH_UTF16MUNGED, CH_UNIX) "
309 "failed for of %s - %s\n",
310 domain
, nt_errstr(status
));
314 talloc_keep_secret(new_trust_pw_blob
.data
);
316 switch (sec_channel_type
) {
320 status
= secrets_prepare_password_change(domain
, dcname
,
322 frame
, &info
, &prev
);
323 if (!NT_STATUS_IS_OK(status
)) {
324 DEBUG(0, ("secrets_prepare_password_change() failed for domain %s!\n",
327 return NT_STATUS_INTERNAL_DB_CORRUPTION
;
329 TALLOC_FREE(new_trust_pw_str
);
333 * We had a failure before we changed the password.
335 nt_hashes
[idx
++] = &prev
->password
->nt_hash
;
337 DEBUG(0,("%s : %s(%s): A password change was already "
338 "started against '%s' at %s. Trying to "
340 current_timestring(talloc_tos(), false),
342 prev
->password
->change_server
,
343 nt_time_string(talloc_tos(),
344 prev
->password
->change_time
)));
345 DEBUG(0,("%s : %s(%s): Last failure local[%s] remote[%s] "
346 "against '%s' at %s.\n",
347 current_timestring(talloc_tos(), false),
349 nt_errstr(prev
->local_status
),
350 nt_errstr(prev
->remote_status
),
352 nt_time_string(talloc_tos(),
353 prev
->change_time
)));
357 nt_hashes
[idx
++] = &info
->password
->nt_hash
;
358 if (info
->old_password
!= NULL
) {
359 nt_hashes
[idx
++] = &info
->old_password
->nt_hash
;
361 if (info
->older_password
!= NULL
) {
362 nt_hashes
[idx
++] = &info
->older_password
->nt_hash
;
366 * We use the password that's already persistent in
367 * our database in order to handle failures.
369 data_blob_free(&new_trust_pw_blob
);
370 new_trust_pw_blob
= info
->next_change
->password
->cleartext_blob
;
373 case SEC_CHAN_DNS_DOMAIN
:
374 case SEC_CHAN_DOMAIN
:
376 nt_hashes
[idx
++] = current_nt_hash
;
377 if (previous_nt_hash
!= NULL
) {
378 nt_hashes
[idx
++] = previous_nt_hash
;
383 smb_panic("Unsupported secure channel type");
388 DEBUG(0,("%s : %s(%s): Verifying passwords remotely %s.\n",
389 current_timestring(talloc_tos(), false),
390 __func__
, domain
, context_name
));
393 * Check which password the dc knows about.
396 * If the previous password is the only password in common with the dc,
397 * we better skip the password change, or use something like
398 * ServerTrustPasswordsGet() or netr_ServerGetTrustInfo() to fix our
399 * local secrets before doing the change.
401 status
= netlogon_creds_cli_lck_auth(context
, b
,
405 if (!NT_STATUS_IS_OK(status
)) {
406 DEBUG(0, ("netlogon_creds_cli_auth(%s) failed for old passwords (%u) - %s!\n",
407 context_name
, num_nt_hashes
, nt_errstr(status
)));
412 if (prev
!= NULL
&& idx_nt_hashes
== 0) {
413 DEBUG(0,("%s : %s(%s): Verified new password remotely "
414 "without changing %s\n",
415 current_timestring(talloc_tos(), false),
416 __func__
, domain
, context_name
));
418 status
= secrets_finish_password_change(prev
->password
->change_server
,
419 prev
->password
->change_time
,
421 if (!NT_STATUS_IS_OK(status
)) {
422 DEBUG(0, ("secrets_prepare_password_change() failed for domain %s!\n",
425 return NT_STATUS_INTERNAL_DB_CORRUPTION
;
428 DEBUG(0,("%s : %s(%s): Recovered previous password change.\n",
429 current_timestring(talloc_tos(), false),
435 if (idx_nt_hashes
!= idx_current
) {
436 DEBUG(0,("%s : %s(%s): Verified older password remotely "
437 "skip changing %s\n",
438 current_timestring(talloc_tos(), false),
439 __func__
, domain
, context_name
));
443 return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE
;
446 status
= secrets_defer_password_change(dcname
,
447 NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE
,
448 NT_STATUS_NOT_COMMITTED
,
450 if (!NT_STATUS_IS_OK(status
)) {
451 DEBUG(0, ("secrets_defer_password_change() failed for domain %s!\n",
454 return NT_STATUS_INTERNAL_DB_CORRUPTION
;
457 return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE
;
460 DEBUG(0,("%s : %s(%s): Verified old password remotely using %s\n",
461 current_timestring(talloc_tos(), false),
462 __func__
, domain
, context_name
));
465 * Return the result of trying to write the new password
466 * back into the trust account file.
469 switch (sec_channel_type
) {
474 * we called secrets_prepare_password_change() above.
478 case SEC_CHAN_DNS_DOMAIN
:
479 case SEC_CHAN_DOMAIN
:
481 * we need to get the sid first for the
482 * pdb_set_trusteddom_pw call
484 ok
= pdb_set_trusteddom_pw(domain
, new_trust_pw_str
,
485 &td
->security_identifier
);
487 DEBUG(0, ("pdb_set_trusteddom_pw() failed for domain %s!\n",
490 return NT_STATUS_INTERNAL_DB_CORRUPTION
;
492 TALLOC_FREE(new_trust_pw_str
);
496 smb_panic("Unsupported secure channel type");
500 DEBUG(0,("%s : %s(%s): Changed password locally\n",
501 current_timestring(talloc_tos(), false), __func__
, domain
));
503 status
= netlogon_creds_cli_ServerPasswordSet(context
, b
,
506 if (!NT_STATUS_IS_OK(status
)) {
508 const char *fn
= NULL
;
510 ok
= dcerpc_binding_handle_is_connected(b
);
512 DEBUG(0,("%s : %s(%s) remote password change with %s failed "
514 current_timestring(talloc_tos(), false),
515 __func__
, domain
, context_name
,
517 ok
? "connected": "disconnected"));
521 * The connection is broken, we don't
522 * know if the password was changed,
523 * we hope to have more luck next time.
525 status2
= secrets_failed_password_change(dcname
,
526 NT_STATUS_NOT_COMMITTED
,
529 fn
= "secrets_failed_password_change";
532 * The server rejected the change, we don't
533 * retry and defer the change to the next
534 * "machine password timeout" interval.
536 status2
= secrets_defer_password_change(dcname
,
537 NT_STATUS_NOT_COMMITTED
,
540 fn
= "secrets_defer_password_change";
542 if (!NT_STATUS_IS_OK(status2
)) {
543 DEBUG(0, ("%s() failed for domain %s!\n",
546 return NT_STATUS_INTERNAL_DB_CORRUPTION
;
553 DEBUG(0,("%s : %s(%s): Changed password remotely using %s\n",
554 current_timestring(talloc_tos(), false),
555 __func__
, domain
, context_name
));
557 switch (sec_channel_type
) {
561 status
= secrets_finish_password_change(
562 info
->next_change
->change_server
,
563 info
->next_change
->change_time
,
565 if (!NT_STATUS_IS_OK(status
)) {
566 DEBUG(0, ("secrets_finish_password_change() failed for domain %s!\n",
569 return NT_STATUS_INTERNAL_DB_CORRUPTION
;
572 DEBUG(0,("%s : %s(%s): Finished password change.\n",
573 current_timestring(talloc_tos(), false),
577 case SEC_CHAN_DNS_DOMAIN
:
578 case SEC_CHAN_DOMAIN
:
580 * we used pdb_set_trusteddom_pw().
585 smb_panic("Unsupported secure channel type");
589 ok
= cli_credentials_set_utf16_password(creds
,
593 DEBUG(0, ("cli_credentials_set_password failed for domain %s!\n",
596 return NT_STATUS_NO_MEMORY
;
599 current_nt_hash
= cli_credentials_get_nt_hash(creds
, frame
);
600 if (current_nt_hash
== NULL
) {
601 DEBUG(0, ("cli_credentials_get_nt_hash failed for domain %s!\n",
604 return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE
;
608 * Now we verify the new password.
611 nt_hashes
[idx
++] = current_nt_hash
;
613 status
= netlogon_creds_cli_lck_auth(context
, b
,
617 if (!NT_STATUS_IS_OK(status
)) {
618 DEBUG(0, ("netlogon_creds_cli_auth(%s) failed for new password - %s!\n",
619 context_name
, nt_errstr(status
)));
624 DEBUG(0,("%s : %s(%s): Verified new password remotely using %s\n",
625 current_timestring(talloc_tos(), false),
626 __func__
, domain
, context_name
));