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winbindd: queryuser - only get group name if needed
[Samba.git] / source3 / smbd / smb2_sesssetup.c
blobeda538f17f663c15446c21979e37d809f750fcb5
1 /*
2 Unix SMB/CIFS implementation.
3 Core SMB2 server
4
5 Copyright (C) Stefan Metzmacher 2009
6 Copyright (C) Jeremy Allison 2010
7
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.
12
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.
17
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/>.
20 */
21
22 #include "includes.h"
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../libcli/smb/smb_common.h"
26 #include "../auth/gensec/gensec.h"
27 #include "auth.h"
28 #include "../lib/tsocket/tsocket.h"
29 #include "../libcli/security/security.h"
30 #include "../lib/util/tevent_ntstatus.h"
31 #include "lib/crypto/sha512.h"
32 #include "lib/crypto/aes.h"
33 #include "lib/crypto/aes_ccm_128.h"
34 #include "lib/crypto/aes_gcm_128.h"
35
36 static struct tevent_req *smbd_smb2_session_setup_wrap_send(TALLOC_CTX *mem_ctx,
37 struct tevent_context *ev,
38 struct smbd_smb2_request *smb2req,
39 uint64_t in_session_id,
40 uint8_t in_flags,
41 uint8_t in_security_mode,
42 uint64_t in_previous_session_id,
43 DATA_BLOB in_security_buffer);
44 static NTSTATUS smbd_smb2_session_setup_wrap_recv(struct tevent_req *req,
45 uint16_t *out_session_flags,
46 TALLOC_CTX *mem_ctx,
47 DATA_BLOB *out_security_buffer,
48 uint64_t *out_session_id);
49
50 static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq);
51
52 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
53 {
54 const uint8_t *inhdr;
55 const uint8_t *inbody;
56 uint64_t in_session_id;
57 uint8_t in_flags;
58 uint8_t in_security_mode;
59 uint64_t in_previous_session_id;
60 uint16_t in_security_offset;
61 uint16_t in_security_length;
62 DATA_BLOB in_security_buffer;
63 NTSTATUS status;
64 struct tevent_req *subreq;
65
66 status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
67 if (!NT_STATUS_IS_OK(status)) {
68 return smbd_smb2_request_error(smb2req, status);
69 }
70 inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
71 inbody = SMBD_SMB2_IN_BODY_PTR(smb2req);
72
73 in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
74
75 in_flags = CVAL(inbody, 0x02);
76 in_security_mode = CVAL(inbody, 0x03);
77 /* Capabilities = IVAL(inbody, 0x04) */
78 /* Channel = IVAL(inbody, 0x08) */
79 in_security_offset = SVAL(inbody, 0x0C);
80 in_security_length = SVAL(inbody, 0x0E);
81 in_previous_session_id = BVAL(inbody, 0x10);
82
83 if (in_security_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(smb2req))) {
84 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
85 }
86
87 if (in_security_length > SMBD_SMB2_IN_DYN_LEN(smb2req)) {
88 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
89 }
90
91 in_security_buffer.data = SMBD_SMB2_IN_DYN_PTR(smb2req);
92 in_security_buffer.length = in_security_length;
93
94 subreq = smbd_smb2_session_setup_wrap_send(smb2req,
95 smb2req->sconn->ev_ctx,
96 smb2req,
97 in_session_id,
98 in_flags,
99 in_security_mode,
100 in_previous_session_id,
101 in_security_buffer);
102 if (subreq == NULL) {
103 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
104 }
105 tevent_req_set_callback(subreq, smbd_smb2_request_sesssetup_done, smb2req);
106
107 return smbd_smb2_request_pending_queue(smb2req, subreq, 500);
108 }
109
110 static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq)
111 {
112 struct smbd_smb2_request *smb2req =
113 tevent_req_callback_data(subreq,
114 struct smbd_smb2_request);
115 uint8_t *outhdr;
116 DATA_BLOB outbody;
117 DATA_BLOB outdyn;
118 uint16_t out_session_flags = 0;
119 uint64_t out_session_id = 0;
120 uint16_t out_security_offset;
121 DATA_BLOB out_security_buffer = data_blob_null;
122 NTSTATUS status;
123 NTSTATUS error; /* transport error */
124
125 status = smbd_smb2_session_setup_wrap_recv(subreq,
126 &out_session_flags,
127 smb2req,
128 &out_security_buffer,
129 &out_session_id);
130 TALLOC_FREE(subreq);
131 if (!NT_STATUS_IS_OK(status) &&
132 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
133 status = nt_status_squash(status);
134 error = smbd_smb2_request_error(smb2req, status);
135 if (!NT_STATUS_IS_OK(error)) {
136 smbd_server_connection_terminate(smb2req->xconn,
137 nt_errstr(error));
138 return;
139 }
140 return;
141 }
142
143 out_security_offset = SMB2_HDR_BODY + 0x08;
144
145 outhdr = SMBD_SMB2_OUT_HDR_PTR(smb2req);
146
147 outbody = smbd_smb2_generate_outbody(smb2req, 0x08);
148 if (outbody.data == NULL) {
149 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
150 if (!NT_STATUS_IS_OK(error)) {
151 smbd_server_connection_terminate(smb2req->xconn,
152 nt_errstr(error));
153 return;
154 }
155 return;
156 }
157
158 SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
159
160 SSVAL(outbody.data, 0x00, 0x08 + 1); /* struct size */
161 SSVAL(outbody.data, 0x02,
162 out_session_flags); /* session flags */
163 SSVAL(outbody.data, 0x04,
164 out_security_offset); /* security buffer offset */
165 SSVAL(outbody.data, 0x06,
166 out_security_buffer.length); /* security buffer length */
167
168 outdyn = out_security_buffer;
169
170 error = smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
171 __location__);
172 if (!NT_STATUS_IS_OK(error)) {
173 smbd_server_connection_terminate(smb2req->xconn,
174 nt_errstr(error));
175 return;
176 }
177 }
178
179 static NTSTATUS smbd_smb2_auth_generic_return(struct smbXsrv_session *session,
180 struct smbXsrv_session_auth0 **_auth,
181 struct smbd_smb2_request *smb2req,
182 uint8_t in_security_mode,
183 struct auth_session_info *session_info,
184 uint16_t *out_session_flags,
185 uint64_t *out_session_id)
186 {
187 NTSTATUS status;
188 bool guest = false;
189 uint8_t session_key[16];
190 struct smbXsrv_session *x = session;
191 struct smbXsrv_session_auth0 *auth = *_auth;
192 struct smbXsrv_connection *xconn = smb2req->xconn;
193 size_t i;
194 struct _derivation {
195 DATA_BLOB label;
196 DATA_BLOB context;
197 };
198 struct {
199 struct _derivation signing;
200 struct _derivation encryption;
201 struct _derivation decryption;
202 struct _derivation application;
203 } derivation = { };
204
205 *_auth = NULL;
206
207 if (xconn->protocol >= PROTOCOL_SMB3_10) {
208 struct smbXsrv_preauth *preauth;
209 struct _derivation *d;
210 DATA_BLOB p;
211 struct hc_sha512state sctx;
212
213 preauth = talloc_move(smb2req, &auth->preauth);
214
215 samba_SHA512_Init(&sctx);
216 samba_SHA512_Update(&sctx, preauth->sha512_value,
217 sizeof(preauth->sha512_value));
218 for (i = 1; i < smb2req->in.vector_count; i++) {
219 samba_SHA512_Update(&sctx,
220 smb2req->in.vector[i].iov_base,
221 smb2req->in.vector[i].iov_len);
222 }
223 samba_SHA512_Final(preauth->sha512_value, &sctx);
224
225 p = data_blob_const(preauth->sha512_value,
226 sizeof(preauth->sha512_value));
227
228 d = &derivation.signing;
229 d->label = data_blob_string_const_null("SMBSigningKey");
230 d->context = p;
231
232 d = &derivation.decryption;
233 d->label = data_blob_string_const_null("SMBC2SCipherKey");
234 d->context = p;
235
236 d = &derivation.encryption;
237 d->label = data_blob_string_const_null("SMBS2CCipherKey");
238 d->context = p;
239
240 d = &derivation.application;
241 d->label = data_blob_string_const_null("SMBAppKey");
242 d->context = p;
243
244 } else if (xconn->protocol >= PROTOCOL_SMB2_24) {
245 struct _derivation *d;
246
247 d = &derivation.signing;
248 d->label = data_blob_string_const_null("SMB2AESCMAC");
249 d->context = data_blob_string_const_null("SmbSign");
250
251 d = &derivation.decryption;
252 d->label = data_blob_string_const_null("SMB2AESCCM");
253 d->context = data_blob_string_const_null("ServerIn ");
254
255 d = &derivation.encryption;
256 d->label = data_blob_string_const_null("SMB2AESCCM");
257 d->context = data_blob_string_const_null("ServerOut");
258
259 d = &derivation.application;
260 d->label = data_blob_string_const_null("SMB2APP");
261 d->context = data_blob_string_const_null("SmbRpc");
262 }
263
264 if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
265 (xconn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED))
266 {
267 x->global->signing_flags = SMBXSRV_SIGNING_REQUIRED;
268 }
269
270 if ((lp_smb_encrypt(-1) >= SMB_SIGNING_DESIRED) &&
271 (xconn->smb2.client.capabilities & SMB2_CAP_ENCRYPTION)) {
272 x->global->encryption_flags = SMBXSRV_ENCRYPTION_DESIRED;
273 }
274
275 if (lp_smb_encrypt(-1) == SMB_SIGNING_REQUIRED) {
276 x->global->encryption_flags = SMBXSRV_ENCRYPTION_REQUIRED |
277 SMBXSRV_ENCRYPTION_DESIRED;
278 }
279
280 if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
281 if (security_session_user_level(session_info, NULL) == SECURITY_GUEST) {
282 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
283 }
284 /* force no signing */
285 x->global->signing_flags &= ~SMBXSRV_SIGNING_REQUIRED;
286 /* we map anonymous to guest internally */
287 guest = true;
288 }
289
290 if (guest && (x->global->encryption_flags & SMBXSRV_ENCRYPTION_REQUIRED)) {
291 DEBUG(1,("reject guest session as encryption is required\n"));
292 return NT_STATUS_ACCESS_DENIED;
293 }
294
295 if (xconn->smb2.server.cipher == 0) {
296 if (x->global->encryption_flags & SMBXSRV_ENCRYPTION_REQUIRED) {
297 DEBUG(1,("reject session with dialect[0x%04X] "
298 "as encryption is required\n",
299 xconn->smb2.server.dialect));
300 return NT_STATUS_ACCESS_DENIED;
301 }
302 } else {
303 x->global->channels[0].encryption_cipher = xconn->smb2.server.cipher;
304 }
305
306 if (x->global->encryption_flags & SMBXSRV_ENCRYPTION_DESIRED) {
307 *out_session_flags |= SMB2_SESSION_FLAG_ENCRYPT_DATA;
308 }
309
310 ZERO_STRUCT(session_key);
311 memcpy(session_key, session_info->session_key.data,
312 MIN(session_info->session_key.length, sizeof(session_key)));
313
314 x->global->signing_key = data_blob_talloc(x->global,
315 session_key,
316 sizeof(session_key));
317 if (x->global->signing_key.data == NULL) {
318 ZERO_STRUCT(session_key);
319 return NT_STATUS_NO_MEMORY;
320 }
321
322 if (xconn->protocol >= PROTOCOL_SMB2_24) {
323 struct _derivation *d = &derivation.signing;
324
325 smb2_key_derivation(session_key, sizeof(session_key),
326 d->label.data, d->label.length,
327 d->context.data, d->context.length,
328 x->global->signing_key.data);
329 }
330
331 if (xconn->protocol >= PROTOCOL_SMB2_24) {
332 struct _derivation *d = &derivation.decryption;
333
334 x->global->decryption_key = data_blob_talloc(x->global,
335 session_key,
336 sizeof(session_key));
337 if (x->global->decryption_key.data == NULL) {
338 ZERO_STRUCT(session_key);
339 return NT_STATUS_NO_MEMORY;
340 }
341
342 smb2_key_derivation(session_key, sizeof(session_key),
343 d->label.data, d->label.length,
344 d->context.data, d->context.length,
345 x->global->decryption_key.data);
346 }
347
348 if (xconn->protocol >= PROTOCOL_SMB2_24) {
349 struct _derivation *d = &derivation.encryption;
350 size_t nonce_size;
351
352 x->global->encryption_key = data_blob_talloc(x->global,
353 session_key,
354 sizeof(session_key));
355 if (x->global->encryption_key.data == NULL) {
356 ZERO_STRUCT(session_key);
357 return NT_STATUS_NO_MEMORY;
358 }
359
360 smb2_key_derivation(session_key, sizeof(session_key),
361 d->label.data, d->label.length,
362 d->context.data, d->context.length,
363 x->global->encryption_key.data);
364
365 /*
366 * CCM and GCM algorithms must never have their
367 * nonce wrap, or the security of the whole
368 * communication and the keys is destroyed.
369 * We must drop the connection once we have
370 * transfered too much data.
371 *
372 * NOTE: We assume nonces greater than 8 bytes.
373 */
374 generate_random_buffer((uint8_t *)&x->nonce_high_random,
375 sizeof(x->nonce_high_random));
376 switch (xconn->smb2.server.cipher) {
377 case SMB2_ENCRYPTION_AES128_CCM:
378 nonce_size = AES_CCM_128_NONCE_SIZE;
379 break;
380 case SMB2_ENCRYPTION_AES128_GCM:
381 nonce_size = AES_GCM_128_IV_SIZE;
382 break;
383 default:
384 nonce_size = 0;
385 break;
386 }
387 x->nonce_high_max = SMB2_NONCE_HIGH_MAX(nonce_size);
388 x->nonce_high = 0;
389 x->nonce_low = 0;
390 }
391
392 x->global->application_key = data_blob_dup_talloc(x->global,
393 x->global->signing_key);
394 if (x->global->application_key.data == NULL) {
395 ZERO_STRUCT(session_key);
396 return NT_STATUS_NO_MEMORY;
397 }
398
399 if (xconn->protocol >= PROTOCOL_SMB2_24) {
400 struct _derivation *d = &derivation.application;
401
402 smb2_key_derivation(session_key, sizeof(session_key),
403 d->label.data, d->label.length,
404 d->context.data, d->context.length,
405 x->global->application_key.data);
406 }
407 ZERO_STRUCT(session_key);
408
409 x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
410 x->global->signing_key);
411 if (x->global->channels[0].signing_key.data == NULL) {
412 return NT_STATUS_NO_MEMORY;
413 }
414
415 data_blob_clear_free(&session_info->session_key);
416 session_info->session_key = data_blob_dup_talloc(session_info,
417 x->global->application_key);
418 if (session_info->session_key.data == NULL) {
419 return NT_STATUS_NO_MEMORY;
420 }
421
422 session->compat = talloc_zero(session, struct user_struct);
423 if (session->compat == NULL) {
424 return NT_STATUS_NO_MEMORY;
425 }
426 session->compat->session = session;
427 session->compat->homes_snum = -1;
428 session->compat->session_info = session_info;
429 session->compat->session_keystr = NULL;
430 session->compat->vuid = session->global->session_wire_id;
431 DLIST_ADD(smb2req->sconn->users, session->compat);
432 smb2req->sconn->num_users++;
433
434 if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
435 session->compat->homes_snum =
436 register_homes_share(session_info->unix_info->unix_name);
437 }
438
439 set_current_user_info(session_info->unix_info->sanitized_username,
440 session_info->unix_info->unix_name,
441 session_info->info->domain_name);
442
443 reload_services(smb2req->sconn, conn_snum_used, true);
444
445 session->status = NT_STATUS_OK;
446 session->global->auth_session_info = talloc_move(session->global,
447 &session_info);
448 session->global->auth_session_info_seqnum += 1;
449 for (i=0; i < session->global->num_channels; i++) {
450 struct smbXsrv_channel_global0 *_c =
451 &session->global->channels[i];
452
453 _c->auth_session_info_seqnum =
454 session->global->auth_session_info_seqnum;
455 }
456 session->global->auth_time = timeval_to_nttime(&smb2req->request_time);
457 session->global->expiration_time = gensec_expire_time(auth->gensec);
458
459 if (!session_claim(session)) {
460 DEBUG(1, ("smb2: Failed to claim session "
461 "for vuid=%llu\n",
462 (unsigned long long)session->compat->vuid));
463 return NT_STATUS_LOGON_FAILURE;
464 }
465
466 TALLOC_FREE(auth);
467 status = smbXsrv_session_update(session);
468 if (!NT_STATUS_IS_OK(status)) {
469 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
470 (unsigned long long)session->compat->vuid,
471 nt_errstr(status)));
472 return NT_STATUS_LOGON_FAILURE;
473 }
474
475 /*
476 * we attach the session to the request
477 * so that the response can be signed
478 */
479 if (!guest) {
480 smb2req->do_signing = true;
481 }
482
483 global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
484
485 *out_session_id = session->global->session_wire_id;
486 smb2req->last_session_id = session->global->session_wire_id;
487
488 return NT_STATUS_OK;
489 }
490
491 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
492 struct smbXsrv_session_auth0 **_auth,
493 struct smbd_smb2_request *smb2req,
494 struct auth_session_info *session_info,
495 uint16_t *out_session_flags,
496 uint64_t *out_session_id)
497 {
498 NTSTATUS status;
499 struct smbXsrv_session *x = session;
500 struct smbXsrv_session_auth0 *auth = *_auth;
501 struct smbXsrv_connection *xconn = smb2req->xconn;
502 size_t i;
503
504 *_auth = NULL;
505
506 data_blob_clear_free(&session_info->session_key);
507 session_info->session_key = data_blob_dup_talloc(session_info,
508 x->global->application_key);
509 if (session_info->session_key.data == NULL) {
510 return NT_STATUS_NO_MEMORY;
511 }
512
513 session->compat->session_info = session_info;
514 session->compat->vuid = session->global->session_wire_id;
515
516 session->compat->homes_snum =
517 register_homes_share(session_info->unix_info->unix_name);
518
519 set_current_user_info(session_info->unix_info->sanitized_username,
520 session_info->unix_info->unix_name,
521 session_info->info->domain_name);
522
523 reload_services(smb2req->sconn, conn_snum_used, true);
524
525 session->status = NT_STATUS_OK;
526 TALLOC_FREE(session->global->auth_session_info);
527 session->global->auth_session_info = talloc_move(session->global,
528 &session_info);
529 session->global->auth_session_info_seqnum += 1;
530 for (i=0; i < session->global->num_channels; i++) {
531 struct smbXsrv_channel_global0 *_c =
532 &session->global->channels[i];
533
534 _c->auth_session_info_seqnum =
535 session->global->auth_session_info_seqnum;
536 }
537 session->global->auth_time = timeval_to_nttime(&smb2req->request_time);
538 session->global->expiration_time = gensec_expire_time(auth->gensec);
539
540 TALLOC_FREE(auth);
541 status = smbXsrv_session_update(session);
542 if (!NT_STATUS_IS_OK(status)) {
543 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
544 (unsigned long long)session->compat->vuid,
545 nt_errstr(status)));
546 return NT_STATUS_LOGON_FAILURE;
547 }
548
549 conn_clear_vuid_caches(xconn->client->sconn, session->compat->vuid);
550
551 if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
552 smb2req->do_signing = true;
553 }
554
555 *out_session_id = session->global->session_wire_id;
556
557 return NT_STATUS_OK;
558 }
559
560 static NTSTATUS smbd_smb2_bind_auth_return(struct smbXsrv_session *session,
561 struct smbXsrv_session_auth0 **_auth,
562 struct smbd_smb2_request *smb2req,
563 struct auth_session_info *session_info,
564 uint16_t *out_session_flags,
565 uint64_t *out_session_id)
566 {
567 NTSTATUS status;
568 struct smbXsrv_session *x = session;
569 struct smbXsrv_session_auth0 *auth = *_auth;
570 struct smbXsrv_connection *xconn = smb2req->xconn;
571 struct smbXsrv_channel_global0 *c = NULL;
572 uint8_t session_key[16];
573 size_t i;
574 struct _derivation {
575 DATA_BLOB label;
576 DATA_BLOB context;
577 };
578 struct {
579 struct _derivation signing;
580 } derivation = { };
581 bool ok;
582
583 *_auth = NULL;
584
585 if (xconn->protocol >= PROTOCOL_SMB3_10) {
586 struct smbXsrv_preauth *preauth;
587 struct _derivation *d;
588 DATA_BLOB p;
589 struct hc_sha512state sctx;
590
591 preauth = talloc_move(smb2req, &auth->preauth);
592
593 samba_SHA512_Init(&sctx);
594 samba_SHA512_Update(&sctx, preauth->sha512_value,
595 sizeof(preauth->sha512_value));
596 for (i = 1; i < smb2req->in.vector_count; i++) {
597 samba_SHA512_Update(&sctx,
598 smb2req->in.vector[i].iov_base,
599 smb2req->in.vector[i].iov_len);
600 }
601 samba_SHA512_Final(preauth->sha512_value, &sctx);
602
603 p = data_blob_const(preauth->sha512_value,
604 sizeof(preauth->sha512_value));
605
606 d = &derivation.signing;
607 d->label = data_blob_string_const_null("SMBSigningKey");
608 d->context = p;
609
610 } else if (xconn->protocol >= PROTOCOL_SMB2_24) {
611 struct _derivation *d;
612
613 d = &derivation.signing;
614 d->label = data_blob_string_const_null("SMB2AESCMAC");
615 d->context = data_blob_string_const_null("SmbSign");
616 }
617
618 status = smbXsrv_session_find_channel(session, xconn, &c);
619 if (!NT_STATUS_IS_OK(status)) {
620 return status;
621 }
622
623 ok = security_token_is_sid(session_info->security_token,
624 &x->global->auth_session_info->security_token->sids[0]);
625 if (!ok) {
626 return NT_STATUS_NOT_SUPPORTED;
627 }
628
629 if (session_info->session_key.length == 0) {
630 /* See [MS-SMB2] 3.3.5.2.4 for the return code. */
631 return NT_STATUS_NOT_SUPPORTED;
632 }
633
634 ZERO_STRUCT(session_key);
635 memcpy(session_key, session_info->session_key.data,
636 MIN(session_info->session_key.length, sizeof(session_key)));
637
638 c->signing_key = data_blob_talloc(x->global,
639 session_key,
640 sizeof(session_key));
641 if (c->signing_key.data == NULL) {
642 ZERO_STRUCT(session_key);
643 return NT_STATUS_NO_MEMORY;
644 }
645
646 if (xconn->protocol >= PROTOCOL_SMB2_24) {
647 struct _derivation *d = &derivation.signing;
648
649 smb2_key_derivation(session_key, sizeof(session_key),
650 d->label.data, d->label.length,
651 d->context.data, d->context.length,
652 c->signing_key.data);
653 }
654 ZERO_STRUCT(session_key);
655
656 TALLOC_FREE(auth);
657 status = smbXsrv_session_update(session);
658 if (!NT_STATUS_IS_OK(status)) {
659 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
660 (unsigned long long)session->compat->vuid,
661 nt_errstr(status)));
662 return NT_STATUS_LOGON_FAILURE;
663 }
664
665 *out_session_id = session->global->session_wire_id;
666
667 return NT_STATUS_OK;
668 }
669
670 struct smbd_smb2_session_setup_state {
671 struct tevent_context *ev;
672 struct smbd_smb2_request *smb2req;
673 uint64_t in_session_id;
674 uint8_t in_flags;
675 uint8_t in_security_mode;
676 uint64_t in_previous_session_id;
677 DATA_BLOB in_security_buffer;
678 struct smbXsrv_session *session;
679 struct smbXsrv_session_auth0 *auth;
680 struct auth_session_info *session_info;
681 uint16_t out_session_flags;
682 DATA_BLOB out_security_buffer;
683 uint64_t out_session_id;
684 };
685
686 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
687 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
688 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req);
689
690 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
691 struct tevent_context *ev,
692 struct smbd_smb2_request *smb2req,
693 uint64_t in_session_id,
694 uint8_t in_flags,
695 uint8_t in_security_mode,
696 uint64_t in_previous_session_id,
697 DATA_BLOB in_security_buffer)
698 {
699 struct tevent_req *req;
700 struct smbd_smb2_session_setup_state *state;
701 NTSTATUS status;
702 NTTIME now = timeval_to_nttime(&smb2req->request_time);
703 struct tevent_req *subreq;
704 struct smbXsrv_channel_global0 *c = NULL;
705 enum security_user_level seclvl;
706
707 req = tevent_req_create(mem_ctx, &state,
708 struct smbd_smb2_session_setup_state);
709 if (req == NULL) {
710 return NULL;
711 }
712 state->ev = ev;
713 state->smb2req = smb2req;
714 state->in_session_id = in_session_id;
715 state->in_flags = in_flags;
716 state->in_security_mode = in_security_mode;
717 state->in_previous_session_id = in_previous_session_id;
718 state->in_security_buffer = in_security_buffer;
719
720 if (in_flags & SMB2_SESSION_FLAG_BINDING) {
721 if (smb2req->xconn->protocol < PROTOCOL_SMB2_22) {
722 tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
723 return tevent_req_post(req, ev);
724 }
725
726 if (!smb2req->xconn->client->server_multi_channel_enabled) {
727 tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
728 return tevent_req_post(req, ev);
729 }
730
731 if (in_session_id == 0) {
732 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
733 return tevent_req_post(req, ev);
734 }
735
736 if (smb2req->session == NULL) {
737 tevent_req_nterror(req, NT_STATUS_USER_SESSION_DELETED);
738 return tevent_req_post(req, ev);
739 }
740
741 if (!smb2req->do_signing) {
742 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
743 return tevent_req_post(req, ev);
744 }
745
746 status = smbXsrv_session_find_channel(smb2req->session,
747 smb2req->xconn,
748 &c);
749 if (NT_STATUS_IS_OK(status)) {
750 if (c->signing_key.length == 0) {
751 goto auth;
752 }
753 tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
754 return tevent_req_post(req, ev);
755 }
756
757 /*
758 * OLD: 3.00 NEW 3.02 => INVALID_PARAMETER
759 * OLD: 3.02 NEW 3.00 => INVALID_PARAMETER
760 * OLD: 2.10 NEW 3.02 => ACCESS_DENIED
761 * OLD: 3.02 NEW 2.10 => ACCESS_DENIED
762 */
763 if (smb2req->session->global->connection_dialect
764 < SMB2_DIALECT_REVISION_222)
765 {
766 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
767 return tevent_req_post(req, ev);
768 }
769 if (smb2req->xconn->smb2.server.dialect
770 < SMB2_DIALECT_REVISION_222)
771 {
772 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
773 return tevent_req_post(req, ev);
774 }
775 if (smb2req->session->global->connection_dialect
776 != smb2req->xconn->smb2.server.dialect)
777 {
778 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
779 return tevent_req_post(req, ev);
780 }
781
782 seclvl = security_session_user_level(
783 smb2req->session->global->auth_session_info,
784 NULL);
785 if (seclvl < SECURITY_USER) {
786 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
787 return tevent_req_post(req, ev);
788 }
789
790 status = smbXsrv_session_add_channel(smb2req->session,
791 smb2req->xconn,
792 &c);
793 if (!NT_STATUS_IS_OK(status)) {
794 tevent_req_nterror(req, status);
795 return tevent_req_post(req, ev);
796 }
797
798 status = smbXsrv_session_update(smb2req->session);
799 if (!NT_STATUS_IS_OK(status)) {
800 tevent_req_nterror(req, status);
801 return tevent_req_post(req, ev);
802 }
803 }
804
805 auth:
806
807 if (state->in_session_id == 0) {
808 /* create a new session */
809 status = smbXsrv_session_create(state->smb2req->xconn,
810 now, &state->session);
811 if (tevent_req_nterror(req, status)) {
812 return tevent_req_post(req, ev);
813 }
814 smb2req->session = state->session;
815 } else {
816 if (smb2req->session == NULL) {
817 tevent_req_nterror(req, NT_STATUS_USER_SESSION_DELETED);
818 return tevent_req_post(req, ev);
819 }
820
821 state->session = smb2req->session;
822 status = state->session->status;
823 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
824 status = NT_STATUS_OK;
825 }
826 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
827 status = NT_STATUS_OK;
828 }
829 if (tevent_req_nterror(req, status)) {
830 return tevent_req_post(req, ev);
831 }
832 if (!(in_flags & SMB2_SESSION_FLAG_BINDING)) {
833 state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
834 }
835 }
836
837 status = smbXsrv_session_find_channel(smb2req->session,
838 smb2req->xconn, &c);
839 if (!NT_STATUS_IS_OK(status)) {
840 tevent_req_nterror(req, status);
841 return tevent_req_post(req, ev);
842 }
843
844 status = smbXsrv_session_find_auth(state->session, smb2req->xconn,
845 now, &state->auth);
846 if (!NT_STATUS_IS_OK(status)) {
847 status = smbXsrv_session_create_auth(state->session,
848 smb2req->xconn, now,
849 in_flags, in_security_mode,
850 &state->auth);
851 if (tevent_req_nterror(req, status)) {
852 return tevent_req_post(req, ev);
853 }
854 }
855
856 if (state->auth->gensec == NULL) {
857 status = auth_generic_prepare(state->auth,
858 state->smb2req->xconn->remote_address,
859 state->smb2req->xconn->local_address,
860 "SMB2",
861 &state->auth->gensec);
862 if (tevent_req_nterror(req, status)) {
863 return tevent_req_post(req, ev);
864 }
865
866 gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_SESSION_KEY);
867 gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_UNIX_TOKEN);
868 gensec_want_feature(state->auth->gensec, GENSEC_FEATURE_SMB_TRANSPORT);
869
870 status = gensec_start_mech_by_oid(state->auth->gensec,
871 GENSEC_OID_SPNEGO);
872 if (tevent_req_nterror(req, status)) {
873 return tevent_req_post(req, ev);
874 }
875 }
876
877 status = smbXsrv_session_update(state->session);
878 if (tevent_req_nterror(req, status)) {
879 return tevent_req_post(req, ev);
880 }
881
882 become_root();
883 subreq = gensec_update_send(state, state->ev,
884 state->auth->gensec,
885 state->in_security_buffer);
886 unbecome_root();
887 if (tevent_req_nomem(subreq, req)) {
888 return tevent_req_post(req, ev);
889 }
890 tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
891
892 return req;
893 }
894
895 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
896 {
897 struct tevent_req *req =
898 tevent_req_callback_data(subreq,
899 struct tevent_req);
900 struct smbd_smb2_session_setup_state *state =
901 tevent_req_data(req,
902 struct smbd_smb2_session_setup_state);
903 NTSTATUS status;
904
905 become_root();
906 status = gensec_update_recv(subreq, state,
907 &state->out_security_buffer);
908 unbecome_root();
909 TALLOC_FREE(subreq);
910 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
911 !NT_STATUS_IS_OK(status)) {
912 tevent_req_nterror(req, status);
913 return;
914 }
915
916 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
917 state->out_session_id = state->session->global->session_wire_id;
918 state->smb2req->preauth = state->auth->preauth;
919 tevent_req_nterror(req, status);
920 return;
921 }
922
923 status = gensec_session_info(state->auth->gensec,
924 state,
925 &state->session_info);
926 if (tevent_req_nterror(req, status)) {
927 return;
928 }
929
930 if ((state->in_previous_session_id != 0) &&
931 (state->session->global->session_wire_id !=
932 state->in_previous_session_id))
933 {
934 subreq = smb2srv_session_close_previous_send(state, state->ev,
935 state->smb2req->xconn,
936 state->session_info,
937 state->in_previous_session_id,
938 state->session->global->session_wire_id);
939 if (tevent_req_nomem(subreq, req)) {
940 return;
941 }
942 tevent_req_set_callback(subreq,
943 smbd_smb2_session_setup_previous_done,
944 req);
945 return;
946 }
947
948 smbd_smb2_session_setup_auth_return(req);
949 }
950
951 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
952 {
953 struct tevent_req *req =
954 tevent_req_callback_data(subreq,
955 struct tevent_req);
956 NTSTATUS status;
957
958 status = smb2srv_session_close_previous_recv(subreq);
959 TALLOC_FREE(subreq);
960 if (tevent_req_nterror(req, status)) {
961 return;
962 }
963
964 smbd_smb2_session_setup_auth_return(req);
965 }
966
967 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req)
968 {
969 struct smbd_smb2_session_setup_state *state =
970 tevent_req_data(req,
971 struct smbd_smb2_session_setup_state);
972 NTSTATUS status;
973
974 if (state->in_flags & SMB2_SESSION_FLAG_BINDING) {
975 status = smbd_smb2_bind_auth_return(state->session,
976 &state->auth,
977 state->smb2req,
978 state->session_info,
979 &state->out_session_flags,
980 &state->out_session_id);
981 if (tevent_req_nterror(req, status)) {
982 return;
983 }
984 tevent_req_done(req);
985 return;
986 }
987
988 if (state->session->global->auth_session_info != NULL) {
989 status = smbd_smb2_reauth_generic_return(state->session,
990 &state->auth,
991 state->smb2req,
992 state->session_info,
993 &state->out_session_flags,
994 &state->out_session_id);
995 if (tevent_req_nterror(req, status)) {
996 return;
997 }
998 tevent_req_done(req);
999 return;
1000 }
1001
1002 status = smbd_smb2_auth_generic_return(state->session,
1003 &state->auth,
1004 state->smb2req,
1005 state->in_security_mode,
1006 state->session_info,
1007 &state->out_session_flags,
1008 &state->out_session_id);
1009 if (tevent_req_nterror(req, status)) {
1010 return;
1011 }
1012
1013 tevent_req_done(req);
1014 return;
1015 }
1016
1017 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
1018 uint16_t *out_session_flags,
1019 TALLOC_CTX *mem_ctx,
1020 DATA_BLOB *out_security_buffer,
1021 uint64_t *out_session_id)
1022 {
1023 struct smbd_smb2_session_setup_state *state =
1024 tevent_req_data(req,
1025 struct smbd_smb2_session_setup_state);
1026 NTSTATUS status;
1027
1028 if (tevent_req_is_nterror(req, &status)) {
1029 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1030 tevent_req_received(req);
1031 return nt_status_squash(status);
1032 }
1033 } else {
1034 status = NT_STATUS_OK;
1035 }
1036
1037 *out_session_flags = state->out_session_flags;
1038 *out_security_buffer = state->out_security_buffer;
1039 *out_session_id = state->out_session_id;
1040
1041 talloc_steal(mem_ctx, out_security_buffer->data);
1042 tevent_req_received(req);
1043 return status;
1044 }
1045
1046 struct smbd_smb2_session_setup_wrap_state {
1047 struct tevent_context *ev;
1048 struct smbd_smb2_request *smb2req;
1049 uint64_t in_session_id;
1050 uint8_t in_flags;
1051 uint8_t in_security_mode;
1052 uint64_t in_previous_session_id;
1053 DATA_BLOB in_security_buffer;
1054 uint16_t out_session_flags;
1055 DATA_BLOB out_security_buffer;
1056 uint64_t out_session_id;
1057 NTSTATUS error;
1058 };
1059
1060 static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq);
1061 static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq);
1062
1063 static struct tevent_req *smbd_smb2_session_setup_wrap_send(TALLOC_CTX *mem_ctx,
1064 struct tevent_context *ev,
1065 struct smbd_smb2_request *smb2req,
1066 uint64_t in_session_id,
1067 uint8_t in_flags,
1068 uint8_t in_security_mode,
1069 uint64_t in_previous_session_id,
1070 DATA_BLOB in_security_buffer)
1071 {
1072 struct tevent_req *req;
1073 struct smbd_smb2_session_setup_wrap_state *state;
1074 struct tevent_req *subreq;
1075
1076 req = tevent_req_create(mem_ctx, &state,
1077 struct smbd_smb2_session_setup_wrap_state);
1078 if (req == NULL) {
1079 return NULL;
1080 }
1081 state->ev = ev;
1082 state->smb2req = smb2req;
1083 state->in_session_id = in_session_id;
1084 state->in_flags = in_flags;
1085 state->in_security_mode = in_security_mode;
1086 state->in_previous_session_id = in_previous_session_id;
1087 state->in_security_buffer = in_security_buffer;
1088
1089 subreq = smbd_smb2_session_setup_send(state, state->ev,
1090 state->smb2req,
1091 state->in_session_id,
1092 state->in_flags,
1093 state->in_security_mode,
1094 state->in_previous_session_id,
1095 state->in_security_buffer);
1096 if (tevent_req_nomem(subreq, req)) {
1097 return tevent_req_post(req, ev);
1098 }
1099 tevent_req_set_callback(subreq,
1100 smbd_smb2_session_setup_wrap_setup_done, req);
1101
1102 return req;
1103 }
1104
1105 static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq)
1106 {
1107 struct tevent_req *req =
1108 tevent_req_callback_data(subreq,
1109 struct tevent_req);
1110 struct smbd_smb2_session_setup_wrap_state *state =
1111 tevent_req_data(req,
1112 struct smbd_smb2_session_setup_wrap_state);
1113 NTSTATUS status;
1114
1115 status = smbd_smb2_session_setup_recv(subreq,
1116 &state->out_session_flags,
1117 state,
1118 &state->out_security_buffer,
1119 &state->out_session_id);
1120 TALLOC_FREE(subreq);
1121 if (NT_STATUS_IS_OK(status)) {
1122 tevent_req_done(req);
1123 return;
1124 }
1125 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1126 tevent_req_nterror(req, status);
1127 return;
1128 }
1129
1130 if (state->smb2req->session == NULL) {
1131 tevent_req_nterror(req, status);
1132 return;
1133 }
1134
1135 state->error = status;
1136
1137 subreq = smb2srv_session_shutdown_send(state, state->ev,
1138 state->smb2req->session,
1139 state->smb2req);
1140 if (tevent_req_nomem(subreq, req)) {
1141 return;
1142 }
1143 tevent_req_set_callback(subreq,
1144 smbd_smb2_session_setup_wrap_shutdown_done,
1145 req);
1146 }
1147
1148 static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq)
1149 {
1150 struct tevent_req *req =
1151 tevent_req_callback_data(subreq,
1152 struct tevent_req);
1153 struct smbd_smb2_session_setup_wrap_state *state =
1154 tevent_req_data(req,
1155 struct smbd_smb2_session_setup_wrap_state);
1156 NTSTATUS status;
1157
1158 status = smb2srv_session_shutdown_recv(subreq);
1159 TALLOC_FREE(subreq);
1160 if (tevent_req_nterror(req, status)) {
1161 return;
1162 }
1163
1164 /*
1165 * we may need to sign the response, so we need to keep
1166 * the session until the response is sent to the wire.
1167 */
1168 talloc_steal(state->smb2req, state->smb2req->session);
1169
1170 tevent_req_nterror(req, state->error);
1171 }
1172
1173 static NTSTATUS smbd_smb2_session_setup_wrap_recv(struct tevent_req *req,
1174 uint16_t *out_session_flags,
1175 TALLOC_CTX *mem_ctx,
1176 DATA_BLOB *out_security_buffer,
1177 uint64_t *out_session_id)
1178 {
1179 struct smbd_smb2_session_setup_wrap_state *state =
1180 tevent_req_data(req,
1181 struct smbd_smb2_session_setup_wrap_state);
1182 NTSTATUS status;
1183
1184 if (tevent_req_is_nterror(req, &status)) {
1185 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
1186 tevent_req_received(req);
1187 return nt_status_squash(status);
1188 }
1189 } else {
1190 status = NT_STATUS_OK;
1191 }
1192
1193 *out_session_flags = state->out_session_flags;
1194 *out_security_buffer = state->out_security_buffer;
1195 *out_session_id = state->out_session_id;
1196
1197 talloc_steal(mem_ctx, out_security_buffer->data);
1198 tevent_req_received(req);
1199 return status;
1200 }
1201
1202 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
1203 struct tevent_context *ev,
1204 struct smbd_smb2_request *smb2req);
1205 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req);
1206 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq);
1207
1208 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
1209 {
1210 NTSTATUS status;
1211 struct tevent_req *subreq = NULL;
1212
1213 status = smbd_smb2_request_verify_sizes(req, 0x04);
1214 if (!NT_STATUS_IS_OK(status)) {
1215 return smbd_smb2_request_error(req, status);
1216 }
1217
1218 subreq = smbd_smb2_logoff_send(req, req->sconn->ev_ctx, req);
1219 if (subreq == NULL) {
1220 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
1221 }
1222 tevent_req_set_callback(subreq, smbd_smb2_request_logoff_done, req);
1223
1224 /*
1225 * Wait a long time before going async on this to allow
1226 * requests we're waiting on to finish. Set timeout to 10 secs.
1227 */
1228 return smbd_smb2_request_pending_queue(req, subreq, 10000000);
1229 }
1230
1231 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq)
1232 {
1233 struct smbd_smb2_request *smb2req =
1234 tevent_req_callback_data(subreq,
1235 struct smbd_smb2_request);
1236 DATA_BLOB outbody;
1237 NTSTATUS status;
1238 NTSTATUS error;
1239
1240 status = smbd_smb2_logoff_recv(subreq);
1241 TALLOC_FREE(subreq);
1242 if (!NT_STATUS_IS_OK(status)) {
1243 error = smbd_smb2_request_error(smb2req, status);
1244 if (!NT_STATUS_IS_OK(error)) {
1245 smbd_server_connection_terminate(smb2req->xconn,
1246 nt_errstr(error));
1247 return;
1248 }
1249 return;
1250 }
1251
1252 outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
1253 if (outbody.data == NULL) {
1254 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
1255 if (!NT_STATUS_IS_OK(error)) {
1256 smbd_server_connection_terminate(smb2req->xconn,
1257 nt_errstr(error));
1258 return;
1259 }
1260 return;
1261 }
1262
1263 SSVAL(outbody.data, 0x00, 0x04); /* struct size */
1264 SSVAL(outbody.data, 0x02, 0); /* reserved */
1265
1266 error = smbd_smb2_request_done(smb2req, outbody, NULL);
1267 if (!NT_STATUS_IS_OK(error)) {
1268 smbd_server_connection_terminate(smb2req->xconn,
1269 nt_errstr(error));
1270 return;
1271 }
1272 }
1273
1274 struct smbd_smb2_logoff_state {
1275 struct smbd_smb2_request *smb2req;
1276 };
1277
1278 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq);
1279
1280 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
1281 struct tevent_context *ev,
1282 struct smbd_smb2_request *smb2req)
1283 {
1284 struct tevent_req *req;
1285 struct smbd_smb2_logoff_state *state;
1286 struct tevent_req *subreq;
1287
1288 req = tevent_req_create(mem_ctx, &state,
1289 struct smbd_smb2_logoff_state);
1290 if (req == NULL) {
1291 return NULL;
1292 }
1293 state->smb2req = smb2req;
1294
1295 subreq = smb2srv_session_shutdown_send(state, ev,
1296 smb2req->session,
1297 smb2req);
1298 if (tevent_req_nomem(subreq, req)) {
1299 return tevent_req_post(req, ev);
1300 }
1301 tevent_req_set_callback(subreq, smbd_smb2_logoff_shutdown_done, req);
1302
1303 return req;
1304 }
1305
1306 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq)
1307 {
1308 struct tevent_req *req = tevent_req_callback_data(
1309 subreq, struct tevent_req);
1310 struct smbd_smb2_logoff_state *state = tevent_req_data(
1311 req, struct smbd_smb2_logoff_state);
1312 NTSTATUS status;
1313 bool ok;
1314 const struct GUID *client_guid =
1315 &state->smb2req->session->client->connections->smb2.client.guid;
1316
1317 status = smb2srv_session_shutdown_recv(subreq);
1318 if (tevent_req_nterror(req, status)) {
1319 return;
1320 }
1321 TALLOC_FREE(subreq);
1322
1323 if (!GUID_all_zero(client_guid)) {
1324 ok = remote_arch_cache_delete(client_guid);
1325 if (!ok) {
1326 /* Most likely not an error, but not in cache */
1327 DBG_DEBUG("Deletion from remote arch cache failed\n");
1328 }
1329 }
1330
1331 /*
1332 * As we've been awoken, we may have changed
1333 * uid in the meantime. Ensure we're still
1334 * root (SMB2_OP_LOGOFF has .as_root = true).
1335 */
1336 change_to_root_user();
1337
1338 status = smbXsrv_session_logoff(state->smb2req->session);
1339 if (tevent_req_nterror(req, status)) {
1340 return;
1341 }
1342
1343 /*
1344 * we may need to sign the response, so we need to keep
1345 * the session until the response is sent to the wire.
1346 */
1347 talloc_steal(state->smb2req, state->smb2req->session);
1348
1349 tevent_req_done(req);
1350 }
1351
1352 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req)
1353 {
1354 return tevent_req_simple_recv_ntstatus(req);
1355 }
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