2 Unix SMB/CIFS implementation.
5 Copyright (C) Stefan Metzmacher 2009
6 Copyright (C) Jeremy Allison 2010
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../libcli/smb/smb_common.h"
26 #include "../auth/gensec/gensec.h"
28 #include "../lib/tsocket/tsocket.h"
29 #include "../libcli/security/security.h"
30 #include "../lib/util/tevent_ntstatus.h"
32 static struct tevent_req
*smbd_smb2_session_setup_send(TALLOC_CTX
*mem_ctx
,
33 struct tevent_context
*ev
,
34 struct smbd_smb2_request
*smb2req
,
35 uint64_t in_session_id
,
37 uint8_t in_security_mode
,
38 uint64_t in_previous_session_id
,
39 DATA_BLOB in_security_buffer
);
40 static NTSTATUS
smbd_smb2_session_setup_recv(struct tevent_req
*req
,
41 uint16_t *out_session_flags
,
43 DATA_BLOB
*out_security_buffer
,
44 uint64_t *out_session_id
);
46 static void smbd_smb2_request_sesssetup_done(struct tevent_req
*subreq
);
48 NTSTATUS
smbd_smb2_request_process_sesssetup(struct smbd_smb2_request
*smb2req
)
51 const uint8_t *inbody
;
52 int i
= smb2req
->current_idx
;
53 uint64_t in_session_id
;
55 uint8_t in_security_mode
;
56 uint64_t in_previous_session_id
;
57 uint16_t in_security_offset
;
58 uint16_t in_security_length
;
59 DATA_BLOB in_security_buffer
;
61 struct tevent_req
*subreq
;
63 status
= smbd_smb2_request_verify_sizes(smb2req
, 0x19);
64 if (!NT_STATUS_IS_OK(status
)) {
65 return smbd_smb2_request_error(smb2req
, status
);
67 inhdr
= (const uint8_t *)smb2req
->in
.vector
[i
+0].iov_base
;
68 inbody
= (const uint8_t *)smb2req
->in
.vector
[i
+1].iov_base
;
70 in_session_id
= BVAL(inhdr
, SMB2_HDR_SESSION_ID
);
72 in_flags
= CVAL(inbody
, 0x02);
73 in_security_mode
= CVAL(inbody
, 0x03);
74 /* Capabilities = IVAL(inbody, 0x04) */
75 /* Channel = IVAL(inbody, 0x08) */
76 in_security_offset
= SVAL(inbody
, 0x0C);
77 in_security_length
= SVAL(inbody
, 0x0E);
78 in_previous_session_id
= BVAL(inbody
, 0x10);
80 if (in_security_offset
!= (SMB2_HDR_BODY
+ smb2req
->in
.vector
[i
+1].iov_len
)) {
81 return smbd_smb2_request_error(smb2req
, NT_STATUS_INVALID_PARAMETER
);
84 if (in_security_length
> smb2req
->in
.vector
[i
+2].iov_len
) {
85 return smbd_smb2_request_error(smb2req
, NT_STATUS_INVALID_PARAMETER
);
88 in_security_buffer
.data
= (uint8_t *)smb2req
->in
.vector
[i
+2].iov_base
;
89 in_security_buffer
.length
= in_security_length
;
91 subreq
= smbd_smb2_session_setup_send(smb2req
,
92 smb2req
->sconn
->ev_ctx
,
97 in_previous_session_id
,
100 return smbd_smb2_request_error(smb2req
, NT_STATUS_NO_MEMORY
);
102 tevent_req_set_callback(subreq
, smbd_smb2_request_sesssetup_done
, smb2req
);
104 return smbd_smb2_request_pending_queue(smb2req
, subreq
, 500);
107 static void smbd_smb2_request_sesssetup_done(struct tevent_req
*subreq
)
109 struct smbd_smb2_request
*smb2req
=
110 tevent_req_callback_data(subreq
,
111 struct smbd_smb2_request
);
112 int i
= smb2req
->current_idx
;
116 uint16_t out_session_flags
;
117 uint64_t out_session_id
;
118 uint16_t out_security_offset
;
119 DATA_BLOB out_security_buffer
= data_blob_null
;
121 NTSTATUS error
; /* transport error */
123 status
= smbd_smb2_session_setup_recv(subreq
,
126 &out_security_buffer
,
129 if (!NT_STATUS_IS_OK(status
) &&
130 !NT_STATUS_EQUAL(status
, NT_STATUS_MORE_PROCESSING_REQUIRED
)) {
131 status
= nt_status_squash(status
);
132 error
= smbd_smb2_request_error(smb2req
, status
);
133 if (!NT_STATUS_IS_OK(error
)) {
134 smbd_server_connection_terminate(smb2req
->sconn
,
141 out_security_offset
= SMB2_HDR_BODY
+ 0x08;
143 outhdr
= (uint8_t *)smb2req
->out
.vector
[i
].iov_base
;
145 outbody
= data_blob_talloc(smb2req
->out
.vector
, NULL
, 0x08);
146 if (outbody
.data
== NULL
) {
147 error
= smbd_smb2_request_error(smb2req
, NT_STATUS_NO_MEMORY
);
148 if (!NT_STATUS_IS_OK(error
)) {
149 smbd_server_connection_terminate(smb2req
->sconn
,
156 SBVAL(outhdr
, SMB2_HDR_SESSION_ID
, out_session_id
);
158 SSVAL(outbody
.data
, 0x00, 0x08 + 1); /* struct size */
159 SSVAL(outbody
.data
, 0x02,
160 out_session_flags
); /* session flags */
161 SSVAL(outbody
.data
, 0x04,
162 out_security_offset
); /* security buffer offset */
163 SSVAL(outbody
.data
, 0x06,
164 out_security_buffer
.length
); /* security buffer length */
166 outdyn
= out_security_buffer
;
168 error
= smbd_smb2_request_done_ex(smb2req
, status
, outbody
, &outdyn
,
170 if (!NT_STATUS_IS_OK(error
)) {
171 smbd_server_connection_terminate(smb2req
->sconn
,
177 static NTSTATUS
smbd_smb2_auth_generic_return(struct smbXsrv_session
*session
,
178 struct smbd_smb2_request
*smb2req
,
179 uint8_t in_security_mode
,
180 struct auth_session_info
*session_info
,
181 uint16_t *out_session_flags
,
182 uint64_t *out_session_id
)
186 uint8_t session_key
[16];
187 struct smbXsrv_session
*x
= session
;
188 struct smbXsrv_connection
*conn
= session
->connection
;
190 if ((in_security_mode
& SMB2_NEGOTIATE_SIGNING_REQUIRED
) ||
191 lp_server_signing() == SMB_SIGNING_REQUIRED
) {
192 x
->global
->signing_required
= true;
195 if (security_session_user_level(session_info
, NULL
) < SECURITY_USER
) {
196 /* we map anonymous to guest internally */
197 *out_session_flags
|= SMB2_SESSION_FLAG_IS_GUEST
;
198 *out_session_flags
|= SMB2_SESSION_FLAG_IS_NULL
;
199 /* force no signing */
200 x
->global
->signing_required
= false;
204 ZERO_STRUCT(session_key
);
205 memcpy(session_key
, session_info
->session_key
.data
,
206 MIN(session_info
->session_key
.length
, sizeof(session_key
)));
208 x
->global
->signing_key
= data_blob_talloc(x
->global
,
210 sizeof(session_key
));
211 if (x
->global
->signing_key
.data
== NULL
) {
212 ZERO_STRUCT(session_key
);
213 TALLOC_FREE(session
);
214 return NT_STATUS_NO_MEMORY
;
217 if (conn
->protocol
>= PROTOCOL_SMB2_24
) {
218 const DATA_BLOB label
= data_blob_string_const_null("SMB2AESCMAC");
219 const DATA_BLOB context
= data_blob_string_const_null("SmbSign");
221 smb2_key_derivation(session_key
, sizeof(session_key
),
222 label
.data
, label
.length
,
223 context
.data
, context
.length
,
224 x
->global
->signing_key
.data
);
227 x
->global
->application_key
= data_blob_dup_talloc(x
->global
,
228 x
->global
->signing_key
);
229 if (x
->global
->application_key
.data
== NULL
) {
230 ZERO_STRUCT(session_key
);
231 TALLOC_FREE(session
);
232 return NT_STATUS_NO_MEMORY
;
235 if (conn
->protocol
>= PROTOCOL_SMB2_24
) {
236 const DATA_BLOB label
= data_blob_string_const_null("SMB2APP");
237 const DATA_BLOB context
= data_blob_string_const_null("SmbRpc");
239 smb2_key_derivation(session_key
, sizeof(session_key
),
240 label
.data
, label
.length
,
241 context
.data
, context
.length
,
242 x
->global
->application_key
.data
);
244 ZERO_STRUCT(session_key
);
246 x
->global
->channels
[0].signing_key
= data_blob_dup_talloc(x
->global
->channels
,
247 x
->global
->signing_key
);
248 if (x
->global
->channels
[0].signing_key
.data
== NULL
) {
249 TALLOC_FREE(session
);
250 return NT_STATUS_NO_MEMORY
;
253 data_blob_clear_free(&session_info
->session_key
);
254 session_info
->session_key
= data_blob_dup_talloc(session_info
,
255 x
->global
->application_key
);
256 if (session_info
->session_key
.data
== NULL
) {
257 TALLOC_FREE(session
);
258 return NT_STATUS_NO_MEMORY
;
261 session
->compat
= talloc_zero(session
, struct user_struct
);
262 if (session
->compat
== NULL
) {
263 TALLOC_FREE(session
);
264 return NT_STATUS_NO_MEMORY
;
266 session
->compat
->session
= session
;
267 session
->compat
->homes_snum
= -1;
268 session
->compat
->session_info
= session_info
;
269 session
->compat
->session_keystr
= NULL
;
270 session
->compat
->vuid
= session
->global
->session_wire_id
;
271 DLIST_ADD(smb2req
->sconn
->users
, session
->compat
);
272 smb2req
->sconn
->num_users
++;
274 if (security_session_user_level(session_info
, NULL
) >= SECURITY_USER
) {
275 session
->compat
->homes_snum
=
276 register_homes_share(session_info
->unix_info
->unix_name
);
279 if (!session_claim(smb2req
->sconn
, session
->compat
)) {
280 DEBUG(1, ("smb2: Failed to claim session "
282 (unsigned long long)session
->compat
->vuid
));
283 TALLOC_FREE(session
);
284 return NT_STATUS_LOGON_FAILURE
;
287 set_current_user_info(session_info
->unix_info
->sanitized_username
,
288 session_info
->unix_info
->unix_name
,
289 session_info
->info
->domain_name
);
291 reload_services(smb2req
->sconn
, conn_snum_used
, true);
293 session
->status
= NT_STATUS_OK
;
294 session
->global
->auth_session_info
= session_info
;
295 session
->global
->auth_session_info_seqnum
+= 1;
296 session
->global
->channels
[0].auth_session_info_seqnum
=
297 session
->global
->auth_session_info_seqnum
;
298 session
->global
->expiration_time
= gensec_expire_time(session
->gensec
);
300 status
= smbXsrv_session_update(session
);
301 if (!NT_STATUS_IS_OK(status
)) {
302 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
303 (unsigned long long)session
->compat
->vuid
,
305 TALLOC_FREE(session
);
306 return NT_STATUS_LOGON_FAILURE
;
310 * we attach the session to the request
311 * so that the response can be signed
313 smb2req
->session
= session
;
315 smb2req
->do_signing
= true;
318 global_client_caps
|= (CAP_LEVEL_II_OPLOCKS
|CAP_STATUS32
);
320 *out_session_id
= session
->global
->session_wire_id
;
325 static NTSTATUS
smbd_smb2_reauth_generic_return(struct smbXsrv_session
*session
,
326 struct smbd_smb2_request
*smb2req
,
327 struct auth_session_info
*session_info
,
328 uint16_t *out_session_flags
,
329 uint64_t *out_session_id
)
332 struct smbXsrv_session
*x
= session
;
333 struct smbXsrv_connection
*conn
= session
->connection
;
335 data_blob_clear_free(&session_info
->session_key
);
336 session_info
->session_key
= data_blob_dup_talloc(session_info
,
337 x
->global
->application_key
);
338 if (session_info
->session_key
.data
== NULL
) {
339 TALLOC_FREE(session
);
340 return NT_STATUS_NO_MEMORY
;
343 session
->compat
->session_info
= session_info
;
344 session
->compat
->vuid
= session
->global
->session_wire_id
;
346 session
->compat
->homes_snum
=
347 register_homes_share(session_info
->unix_info
->unix_name
);
349 set_current_user_info(session_info
->unix_info
->sanitized_username
,
350 session_info
->unix_info
->unix_name
,
351 session_info
->info
->domain_name
);
353 reload_services(smb2req
->sconn
, conn_snum_used
, true);
355 session
->status
= NT_STATUS_OK
;
356 TALLOC_FREE(session
->global
->auth_session_info
);
357 session
->global
->auth_session_info
= session_info
;
358 session
->global
->auth_session_info_seqnum
+= 1;
359 session
->global
->channels
[0].auth_session_info_seqnum
=
360 session
->global
->auth_session_info_seqnum
;
361 session
->global
->expiration_time
= gensec_expire_time(session
->gensec
);
363 status
= smbXsrv_session_update(session
);
364 if (!NT_STATUS_IS_OK(status
)) {
365 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
366 (unsigned long long)session
->compat
->vuid
,
368 TALLOC_FREE(session
);
369 return NT_STATUS_LOGON_FAILURE
;
372 conn_clear_vuid_caches(conn
->sconn
, session
->compat
->vuid
);
375 * we attach the session to the request
376 * so that the response can be signed
378 smb2req
->session
= session
;
379 smb2req
->do_signing
= true;
381 global_client_caps
|= (CAP_LEVEL_II_OPLOCKS
|CAP_STATUS32
);
383 *out_session_id
= session
->global
->session_wire_id
;
388 struct smbd_smb2_session_setup_state
{
389 struct tevent_context
*ev
;
390 struct smbd_smb2_request
*smb2req
;
391 uint64_t in_session_id
;
393 uint8_t in_security_mode
;
394 uint64_t in_previous_session_id
;
395 DATA_BLOB in_security_buffer
;
396 struct smbXsrv_session
*session
;
397 struct auth_session_info
*session_info
;
398 uint16_t out_session_flags
;
399 DATA_BLOB out_security_buffer
;
400 uint64_t out_session_id
;
403 static int smbd_smb2_session_setup_state_destructor(struct smbd_smb2_session_setup_state
*state
)
406 * if state->session is not NULL,
407 * we remove the session on failure
409 TALLOC_FREE(state
->session
);
413 static void smbd_smb2_session_setup_gensec_done(struct tevent_req
*subreq
);
414 static void smbd_smb2_session_setup_previous_done(struct tevent_req
*subreq
);
416 static struct tevent_req
*smbd_smb2_session_setup_send(TALLOC_CTX
*mem_ctx
,
417 struct tevent_context
*ev
,
418 struct smbd_smb2_request
*smb2req
,
419 uint64_t in_session_id
,
421 uint8_t in_security_mode
,
422 uint64_t in_previous_session_id
,
423 DATA_BLOB in_security_buffer
)
425 struct tevent_req
*req
;
426 struct smbd_smb2_session_setup_state
*state
;
428 NTTIME now
= timeval_to_nttime(&smb2req
->request_time
);
429 struct tevent_req
*subreq
;
431 req
= tevent_req_create(mem_ctx
, &state
,
432 struct smbd_smb2_session_setup_state
);
437 state
->smb2req
= smb2req
;
438 state
->in_session_id
= in_session_id
;
439 state
->in_flags
= in_flags
;
440 state
->in_security_mode
= in_security_mode
;
441 state
->in_previous_session_id
= in_previous_session_id
;
442 state
->in_security_buffer
= in_security_buffer
;
444 talloc_set_destructor(state
, smbd_smb2_session_setup_state_destructor
);
446 if (state
->in_session_id
== 0) {
447 /* create a new session */
448 status
= smbXsrv_session_create(state
->smb2req
->sconn
->conn
,
449 now
, &state
->session
);
450 if (tevent_req_nterror(req
, status
)) {
451 return tevent_req_post(req
, ev
);
454 status
= smb2srv_session_lookup(state
->smb2req
->sconn
->conn
,
455 state
->in_session_id
, now
,
457 if (NT_STATUS_EQUAL(status
, NT_STATUS_NETWORK_SESSION_EXPIRED
)) {
458 status
= NT_STATUS_OK
;
460 if (NT_STATUS_IS_OK(status
)) {
461 state
->session
->status
= NT_STATUS_MORE_PROCESSING_REQUIRED
;
462 status
= NT_STATUS_MORE_PROCESSING_REQUIRED
;
463 TALLOC_FREE(state
->session
->gensec
);
465 if (!NT_STATUS_EQUAL(status
, NT_STATUS_MORE_PROCESSING_REQUIRED
)) {
466 tevent_req_nterror(req
, status
);
467 return tevent_req_post(req
, ev
);
471 if (state
->session
->gensec
== NULL
) {
472 status
= auth_generic_prepare(state
->session
,
473 state
->session
->connection
->remote_address
,
474 &state
->session
->gensec
);
475 if (tevent_req_nterror(req
, status
)) {
476 return tevent_req_post(req
, ev
);
479 gensec_want_feature(state
->session
->gensec
, GENSEC_FEATURE_SESSION_KEY
);
480 gensec_want_feature(state
->session
->gensec
, GENSEC_FEATURE_UNIX_TOKEN
);
482 status
= gensec_start_mech_by_oid(state
->session
->gensec
,
484 if (tevent_req_nterror(req
, status
)) {
485 return tevent_req_post(req
, ev
);
490 subreq
= gensec_update_send(state
, state
->ev
,
491 state
->session
->gensec
,
492 state
->in_security_buffer
);
494 if (tevent_req_nomem(subreq
, req
)) {
495 return tevent_req_post(req
, ev
);
497 tevent_req_set_callback(subreq
, smbd_smb2_session_setup_gensec_done
, req
);
502 static void smbd_smb2_session_setup_gensec_done(struct tevent_req
*subreq
)
504 struct tevent_req
*req
=
505 tevent_req_callback_data(subreq
,
507 struct smbd_smb2_session_setup_state
*state
=
509 struct smbd_smb2_session_setup_state
);
513 status
= gensec_update_recv(subreq
, state
,
514 &state
->out_security_buffer
);
517 if (!NT_STATUS_EQUAL(status
, NT_STATUS_MORE_PROCESSING_REQUIRED
) &&
518 !NT_STATUS_IS_OK(status
)) {
519 tevent_req_nterror(req
, status
);
523 if (NT_STATUS_EQUAL(status
, NT_STATUS_MORE_PROCESSING_REQUIRED
)) {
524 state
->out_session_id
= state
->session
->global
->session_wire_id
;
525 /* we want to keep the session */
526 state
->session
= NULL
;
527 tevent_req_nterror(req
, status
);
531 status
= gensec_session_info(state
->session
->gensec
,
532 state
->session
->global
,
533 &state
->session_info
);
534 if (tevent_req_nterror(req
, status
)) {
538 if ((state
->in_previous_session_id
!= 0) &&
539 (state
->session
->global
->session_wire_id
!=
540 state
->in_previous_session_id
))
542 subreq
= smb2srv_session_close_previous_send(state
, state
->ev
,
543 state
->session
->connection
,
545 state
->in_previous_session_id
,
546 state
->session
->global
->session_wire_id
);
547 if (tevent_req_nomem(subreq
, req
)) {
550 tevent_req_set_callback(subreq
,
551 smbd_smb2_session_setup_previous_done
,
556 if (state
->session
->global
->auth_session_info
!= NULL
) {
557 status
= smbd_smb2_reauth_generic_return(state
->session
,
560 &state
->out_session_flags
,
561 &state
->out_session_id
);
562 if (tevent_req_nterror(req
, status
)) {
565 /* we want to keep the session */
566 state
->session
= NULL
;
567 tevent_req_done(req
);
571 status
= smbd_smb2_auth_generic_return(state
->session
,
573 state
->in_security_mode
,
575 &state
->out_session_flags
,
576 &state
->out_session_id
);
577 if (tevent_req_nterror(req
, status
)) {
581 /* we want to keep the session */
582 state
->session
= NULL
;
583 tevent_req_done(req
);
587 static void smbd_smb2_session_setup_previous_done(struct tevent_req
*subreq
)
589 struct tevent_req
*req
=
590 tevent_req_callback_data(subreq
,
592 struct smbd_smb2_session_setup_state
*state
=
594 struct smbd_smb2_session_setup_state
);
597 status
= smb2srv_session_close_previous_recv(subreq
);
599 if (tevent_req_nterror(req
, status
)) {
603 if (state
->session
->global
->auth_session_info
!= NULL
) {
604 status
= smbd_smb2_reauth_generic_return(state
->session
,
607 &state
->out_session_flags
,
608 &state
->out_session_id
);
609 if (tevent_req_nterror(req
, status
)) {
612 /* we want to keep the session */
613 state
->session
= NULL
;
614 tevent_req_done(req
);
618 status
= smbd_smb2_auth_generic_return(state
->session
,
620 state
->in_security_mode
,
622 &state
->out_session_flags
,
623 &state
->out_session_id
);
624 if (tevent_req_nterror(req
, status
)) {
628 /* we want to keep the session */
629 state
->session
= NULL
;
630 tevent_req_done(req
);
634 static NTSTATUS
smbd_smb2_session_setup_recv(struct tevent_req
*req
,
635 uint16_t *out_session_flags
,
637 DATA_BLOB
*out_security_buffer
,
638 uint64_t *out_session_id
)
640 struct smbd_smb2_session_setup_state
*state
=
642 struct smbd_smb2_session_setup_state
);
645 if (tevent_req_is_nterror(req
, &status
)) {
646 if (!NT_STATUS_EQUAL(status
, NT_STATUS_MORE_PROCESSING_REQUIRED
)) {
647 tevent_req_received(req
);
648 return nt_status_squash(status
);
651 status
= NT_STATUS_OK
;
654 *out_session_flags
= state
->out_session_flags
;
655 *out_security_buffer
= state
->out_security_buffer
;
656 *out_session_id
= state
->out_session_id
;
658 talloc_steal(mem_ctx
, out_security_buffer
->data
);
659 tevent_req_received(req
);
663 NTSTATUS
smbd_smb2_request_process_logoff(struct smbd_smb2_request
*req
)
668 status
= smbd_smb2_request_verify_sizes(req
, 0x04);
669 if (!NT_STATUS_IS_OK(status
)) {
670 return smbd_smb2_request_error(req
, status
);
674 * TODO: cancel all outstanding requests on the session
676 status
= smbXsrv_session_logoff(req
->session
);
677 if (!NT_STATUS_IS_OK(status
)) {
678 DEBUG(0, ("smbd_smb2_request_process_logoff: "
679 "smbXsrv_session_logoff() failed: %s\n",
682 * If we hit this case, there is something completely
683 * wrong, so we better disconnect the transport connection.
689 * we may need to sign the response, so we need to keep
690 * the session until the response is sent to the wire.
692 talloc_steal(req
, req
->session
);
694 outbody
= data_blob_talloc(req
->out
.vector
, NULL
, 0x04);
695 if (outbody
.data
== NULL
) {
696 return smbd_smb2_request_error(req
, NT_STATUS_NO_MEMORY
);
699 SSVAL(outbody
.data
, 0x00, 0x04); /* struct size */
700 SSVAL(outbody
.data
, 0x02, 0); /* reserved */
702 return smbd_smb2_request_done(req
, outbody
, NULL
);