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 "../libcli/auth/spnego.h"
27 #include "../auth/gensec/gensec.h"
28 #include "../auth/ntlmssp/ntlmssp.h"
29 #include "ntlmssp_wrap.h"
30 #include "../librpc/gen_ndr/krb5pac.h"
31 #include "libads/kerberos_proto.h"
32 #include "../lib/util/asn1.h"
34 #include "../lib/tsocket/tsocket.h"
35 #include "../libcli/security/security.h"
37 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
38 uint64_t in_session_id,
39 uint8_t in_security_mode,
40 DATA_BLOB in_security_buffer,
41 uint16_t *out_session_flags,
42 DATA_BLOB *out_security_buffer,
43 uint64_t *out_session_id);
45 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
48 const uint8_t *inbody;
49 int i = smb2req->current_idx;
53 uint64_t in_session_id;
54 uint8_t in_security_mode;
55 uint16_t in_security_offset;
56 uint16_t in_security_length;
57 DATA_BLOB in_security_buffer;
58 uint16_t out_session_flags;
59 uint64_t out_session_id;
60 uint16_t out_security_offset;
61 DATA_BLOB out_security_buffer = data_blob_null;
64 status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
65 if (!NT_STATUS_IS_OK(status)) {
66 return smbd_smb2_request_error(smb2req, status);
68 inhdr = (const uint8_t *)smb2req->in.vector[i+0].iov_base;
69 inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
71 in_security_offset = SVAL(inbody, 0x0C);
72 in_security_length = SVAL(inbody, 0x0E);
74 if (in_security_offset != (SMB2_HDR_BODY + smb2req->in.vector[i+1].iov_len)) {
75 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
78 if (in_security_length > smb2req->in.vector[i+2].iov_len) {
79 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
82 in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
83 in_security_mode = CVAL(inbody, 0x03);
84 in_security_buffer.data = (uint8_t *)smb2req->in.vector[i+2].iov_base;
85 in_security_buffer.length = in_security_length;
87 status = smbd_smb2_session_setup(smb2req,
94 if (!NT_STATUS_IS_OK(status) &&
95 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
96 status = nt_status_squash(status);
97 return smbd_smb2_request_error(smb2req, status);
100 out_security_offset = SMB2_HDR_BODY + 0x08;
102 outhdr = (uint8_t *)smb2req->out.vector[i].iov_base;
104 outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
105 if (outbody.data == NULL) {
106 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
109 SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
111 SSVAL(outbody.data, 0x00, 0x08 + 1); /* struct size */
112 SSVAL(outbody.data, 0x02,
113 out_session_flags); /* session flags */
114 SSVAL(outbody.data, 0x04,
115 out_security_offset); /* security buffer offset */
116 SSVAL(outbody.data, 0x06,
117 out_security_buffer.length); /* security buffer length */
119 outdyn = out_security_buffer;
121 return smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
125 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
127 if (session->sconn == NULL) {
131 /* first free all tcons */
132 while (session->tcons.list) {
133 talloc_free(session->tcons.list);
136 idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
137 DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
138 invalidate_vuid(session->sconn, session->vuid);
141 session->status = NT_STATUS_USER_SESSION_DELETED;
142 session->sconn = NULL;
148 static NTSTATUS smbd_smb2_session_setup_krb5(struct smbd_smb2_session *session,
149 struct smbd_smb2_request *smb2req,
150 uint8_t in_security_mode,
151 const DATA_BLOB *secblob,
153 uint16_t *out_session_flags,
154 DATA_BLOB *out_security_buffer,
155 uint64_t *out_session_id)
157 DATA_BLOB ap_rep = data_blob_null;
158 DATA_BLOB ap_rep_wrapped = data_blob_null;
159 DATA_BLOB ticket = data_blob_null;
160 DATA_BLOB session_key = data_blob_null;
161 DATA_BLOB secblob_out = data_blob_null;
163 struct PAC_LOGON_INFO *logon_info = NULL;
164 char *principal = NULL;
167 struct passwd *pw = NULL;
170 bool username_was_mapped = false;
171 bool map_domainuser_to_guest = false;
174 if (!spnego_parse_krb5_wrap(talloc_tos(), *secblob, &ticket, tok_id)) {
175 status = NT_STATUS_LOGON_FAILURE;
179 status = ads_verify_ticket(smb2req, lp_realm(), 0, &ticket,
180 &principal, &logon_info, &ap_rep,
183 if (!NT_STATUS_IS_OK(status)) {
184 DEBUG(1,("smb2: Failed to verify incoming ticket with error %s!\n",
186 if (!NT_STATUS_EQUAL(status, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
187 status = NT_STATUS_LOGON_FAILURE;
192 status = get_user_from_kerberos_info(talloc_tos(),
193 session->sconn->remote_hostname,
194 principal, logon_info,
195 &username_was_mapped,
196 &map_domainuser_to_guest,
198 &real_username, &pw);
199 if (!NT_STATUS_IS_OK(status)) {
203 /* save the PAC data if we have it */
205 netsamlogon_cache_store(user, &logon_info->info3);
208 /* setup the string used by %U */
209 sub_set_smb_name(real_username);
211 /* reload services so that the new %U is taken into account */
212 reload_services(smb2req->sconn->msg_ctx, smb2req->sconn->sock, true);
214 status = make_session_info_krb5(session,
215 user, domain, real_username, pw,
216 logon_info, map_domainuser_to_guest,
219 &session->session_info);
220 if (!NT_STATUS_IS_OK(status)) {
221 DEBUG(1, ("smb2: make_server_info_krb5 failed\n"));
225 if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
226 lp_server_signing() == Required) {
227 session->do_signing = true;
230 if (security_session_user_level(session->session_info, NULL) < SECURITY_USER) {
231 /* we map anonymous to guest internally */
232 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
233 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
234 /* force no signing */
235 session->do_signing = false;
239 session->session_key = session->session_info->session_key;
241 session->compat_vuser = talloc_zero(session, user_struct);
242 if (session->compat_vuser == NULL) {
243 status = NT_STATUS_NO_MEMORY;
246 session->compat_vuser->auth_ntlmssp_state = NULL;
247 session->compat_vuser->homes_snum = -1;
248 session->compat_vuser->session_info = session->session_info;
249 session->compat_vuser->session_keystr = NULL;
250 session->compat_vuser->vuid = session->vuid;
251 DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
253 if (security_session_user_level(session->session_info, NULL) >= SECURITY_USER) {
254 session->compat_vuser->homes_snum =
255 register_homes_share(session->session_info->unix_info->unix_name);
258 if (!session_claim(session->sconn, session->compat_vuser)) {
259 DEBUG(1, ("smb2: Failed to claim session "
261 session->compat_vuser->vuid));
265 session->status = NT_STATUS_OK;
268 * we attach the session to the request
269 * so that the response can be signed
271 smb2req->session = session;
273 smb2req->do_signing = true;
276 global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
277 status = NT_STATUS_OK;
279 /* wrap that up in a nice GSS-API wrapping */
280 ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
283 secblob_out = spnego_gen_auth_response(
289 *out_security_buffer = data_blob_talloc(smb2req,
292 if (secblob_out.data && out_security_buffer->data == NULL) {
293 status = NT_STATUS_NO_MEMORY;
297 data_blob_free(&ap_rep);
298 data_blob_free(&ap_rep_wrapped);
299 data_blob_free(&ticket);
300 data_blob_free(&session_key);
301 data_blob_free(&secblob_out);
303 *out_session_id = session->vuid;
309 data_blob_free(&ap_rep);
310 data_blob_free(&ap_rep_wrapped);
311 data_blob_free(&ticket);
312 data_blob_free(&session_key);
313 data_blob_free(&secblob_out);
315 ap_rep_wrapped = data_blob_null;
316 secblob_out = spnego_gen_auth_response(
322 *out_security_buffer = data_blob_talloc(smb2req,
325 data_blob_free(&secblob_out);
330 static NTSTATUS smbd_smb2_spnego_negotiate(struct smbd_smb2_session *session,
331 struct smbd_smb2_request *smb2req,
332 uint8_t in_security_mode,
333 DATA_BLOB in_security_buffer,
334 uint16_t *out_session_flags,
335 DATA_BLOB *out_security_buffer,
336 uint64_t *out_session_id)
338 DATA_BLOB secblob_in = data_blob_null;
339 DATA_BLOB chal_out = data_blob_null;
340 char *kerb_mech = NULL;
343 /* Ensure we have no old NTLM state around. */
344 TALLOC_FREE(session->auth_ntlmssp_state);
346 status = parse_spnego_mechanisms(talloc_tos(), in_security_buffer,
347 &secblob_in, &kerb_mech);
348 if (!NT_STATUS_IS_OK(status)) {
353 if (kerb_mech && ((lp_security()==SEC_ADS) ||
354 USE_KERBEROS_KEYTAB) ) {
355 status = smbd_smb2_session_setup_krb5(session,
369 /* The mechtoken is a krb5 ticket, but
370 * we need to fall back to NTLM. */
372 DEBUG(3,("smb2: Got krb5 ticket in SPNEGO "
373 "but set to downgrade to NTLMSSP\n"));
375 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
377 /* Fall back to NTLMSSP. */
378 status = auth_ntlmssp_prepare(session->sconn->remote_address,
379 &session->auth_ntlmssp_state);
380 if (!NT_STATUS_IS_OK(status)) {
384 auth_ntlmssp_want_feature(session->auth_ntlmssp_state, NTLMSSP_FEATURE_SESSION_KEY);
386 status = auth_ntlmssp_start(session->auth_ntlmssp_state);
387 if (!NT_STATUS_IS_OK(status)) {
391 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
397 if (!NT_STATUS_IS_OK(status) &&
398 !NT_STATUS_EQUAL(status,
399 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
403 *out_security_buffer = spnego_gen_auth_response(smb2req,
407 if (out_security_buffer->data == NULL) {
408 status = NT_STATUS_NO_MEMORY;
411 *out_session_id = session->vuid;
415 data_blob_free(&secblob_in);
416 data_blob_free(&chal_out);
417 TALLOC_FREE(kerb_mech);
418 if (!NT_STATUS_IS_OK(status) &&
419 !NT_STATUS_EQUAL(status,
420 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
421 TALLOC_FREE(session->auth_ntlmssp_state);
422 TALLOC_FREE(session);
427 static NTSTATUS smbd_smb2_common_ntlmssp_auth_return(struct smbd_smb2_session *session,
428 struct smbd_smb2_request *smb2req,
429 uint8_t in_security_mode,
430 DATA_BLOB in_security_buffer,
431 uint16_t *out_session_flags,
432 uint64_t *out_session_id)
436 if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
437 lp_server_signing() == Required) {
438 session->do_signing = true;
441 if (security_session_user_level(session->session_info, NULL) < SECURITY_USER) {
442 /* we map anonymous to guest internally */
443 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
444 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
445 /* force no signing */
446 session->do_signing = false;
450 session->session_key = session->session_info->session_key;
452 session->compat_vuser = talloc_zero(session, user_struct);
453 if (session->compat_vuser == NULL) {
454 TALLOC_FREE(session->auth_ntlmssp_state);
455 TALLOC_FREE(session);
456 return NT_STATUS_NO_MEMORY;
458 session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
459 session->compat_vuser->homes_snum = -1;
460 session->compat_vuser->session_info = session->session_info;
461 session->compat_vuser->session_keystr = NULL;
462 session->compat_vuser->vuid = session->vuid;
463 DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
465 if (security_session_user_level(session->session_info, NULL) >= SECURITY_USER) {
466 session->compat_vuser->homes_snum =
467 register_homes_share(session->session_info->unix_info->unix_name);
470 if (!session_claim(session->sconn, session->compat_vuser)) {
471 DEBUG(1, ("smb2: Failed to claim session "
473 session->compat_vuser->vuid));
474 TALLOC_FREE(session->auth_ntlmssp_state);
475 TALLOC_FREE(session);
476 return NT_STATUS_LOGON_FAILURE;
480 session->status = NT_STATUS_OK;
483 * we attach the session to the request
484 * so that the response can be signed
486 smb2req->session = session;
488 smb2req->do_signing = true;
491 global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
493 *out_session_id = session->vuid;
498 static NTSTATUS smbd_smb2_spnego_auth(struct smbd_smb2_session *session,
499 struct smbd_smb2_request *smb2req,
500 uint8_t in_security_mode,
501 DATA_BLOB in_security_buffer,
502 uint16_t *out_session_flags,
503 DATA_BLOB *out_security_buffer,
504 uint64_t *out_session_id)
506 DATA_BLOB auth = data_blob_null;
507 DATA_BLOB auth_out = data_blob_null;
510 if (!spnego_parse_auth(talloc_tos(), in_security_buffer, &auth)) {
511 TALLOC_FREE(session);
512 return NT_STATUS_LOGON_FAILURE;
515 if (auth.data[0] == ASN1_APPLICATION(0)) {
516 /* Might be a second negTokenTarg packet */
517 DATA_BLOB secblob_in = data_blob_null;
518 char *kerb_mech = NULL;
520 status = parse_spnego_mechanisms(talloc_tos(),
522 &secblob_in, &kerb_mech);
523 if (!NT_STATUS_IS_OK(status)) {
524 TALLOC_FREE(session);
529 if (kerb_mech && ((lp_security()==SEC_ADS) ||
530 USE_KERBEROS_KEYTAB) ) {
531 status = smbd_smb2_session_setup_krb5(session,
540 data_blob_free(&secblob_in);
541 TALLOC_FREE(kerb_mech);
542 if (!NT_STATUS_IS_OK(status)) {
543 TALLOC_FREE(session);
549 /* Can't blunder into NTLMSSP auth if we have
553 DEBUG(3,("smb2: network "
554 "misconfiguration, client sent us a "
555 "krb5 ticket and kerberos security "
557 TALLOC_FREE(session);
558 data_blob_free(&secblob_in);
559 TALLOC_FREE(kerb_mech);
560 return NT_STATUS_LOGON_FAILURE;
563 data_blob_free(&secblob_in);
566 if (session->auth_ntlmssp_state == NULL) {
567 status = auth_ntlmssp_prepare(session->sconn->remote_address,
568 &session->auth_ntlmssp_state);
569 if (!NT_STATUS_IS_OK(status)) {
570 data_blob_free(&auth);
571 TALLOC_FREE(session);
575 auth_ntlmssp_want_feature(session->auth_ntlmssp_state, NTLMSSP_FEATURE_SESSION_KEY);
577 status = auth_ntlmssp_start(session->auth_ntlmssp_state);
578 if (!NT_STATUS_IS_OK(status)) {
579 data_blob_free(&auth);
580 TALLOC_FREE(session);
585 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
588 /* If status is NT_STATUS_OK then we need to get the token.
589 * Map to guest is now internal to auth_ntlmssp */
590 if (NT_STATUS_IS_OK(status)) {
591 status = auth_ntlmssp_session_info(session,
592 session->auth_ntlmssp_state,
593 &session->session_info);
596 if (!NT_STATUS_IS_OK(status) &&
597 !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
598 TALLOC_FREE(session->auth_ntlmssp_state);
599 data_blob_free(&auth);
600 TALLOC_FREE(session);
604 data_blob_free(&auth);
606 *out_security_buffer = spnego_gen_auth_response(smb2req,
607 &auth_out, status, NULL);
609 if (out_security_buffer->data == NULL) {
610 TALLOC_FREE(session->auth_ntlmssp_state);
611 TALLOC_FREE(session);
612 return NT_STATUS_NO_MEMORY;
615 *out_session_id = session->vuid;
617 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
618 return NT_STATUS_MORE_PROCESSING_REQUIRED;
621 /* We're done - claim the session. */
622 return smbd_smb2_common_ntlmssp_auth_return(session,
630 static NTSTATUS smbd_smb2_raw_ntlmssp_auth(struct smbd_smb2_session *session,
631 struct smbd_smb2_request *smb2req,
632 uint8_t in_security_mode,
633 DATA_BLOB in_security_buffer,
634 uint16_t *out_session_flags,
635 DATA_BLOB *out_security_buffer,
636 uint64_t *out_session_id)
640 *out_security_buffer = data_blob_null;
642 if (session->auth_ntlmssp_state == NULL) {
643 status = auth_ntlmssp_prepare(session->sconn->remote_address,
644 &session->auth_ntlmssp_state);
645 if (!NT_STATUS_IS_OK(status)) {
646 TALLOC_FREE(session);
650 auth_ntlmssp_want_feature(session->auth_ntlmssp_state, NTLMSSP_FEATURE_SESSION_KEY);
652 if (session->sconn->use_gensec_hook) {
653 status = auth_generic_start(session->auth_ntlmssp_state, GENSEC_OID_SPNEGO);
655 status = auth_ntlmssp_start(session->auth_ntlmssp_state);
657 if (!NT_STATUS_IS_OK(status)) {
658 TALLOC_FREE(session);
664 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
667 out_security_buffer);
669 if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
670 *out_session_id = session->vuid;
674 status = auth_ntlmssp_session_info(session,
675 session->auth_ntlmssp_state,
676 &session->session_info);
678 if (!NT_STATUS_IS_OK(status)) {
679 TALLOC_FREE(session->auth_ntlmssp_state);
680 TALLOC_FREE(session);
683 *out_session_id = session->vuid;
685 return smbd_smb2_common_ntlmssp_auth_return(session,
693 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
694 uint64_t in_session_id,
695 uint8_t in_security_mode,
696 DATA_BLOB in_security_buffer,
697 uint16_t *out_session_flags,
698 DATA_BLOB *out_security_buffer,
699 uint64_t *out_session_id)
701 struct smbd_smb2_session *session;
703 *out_session_flags = 0;
706 if (in_session_id == 0) {
709 /* create a new session */
710 session = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
711 if (session == NULL) {
712 return NT_STATUS_NO_MEMORY;
714 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
715 id = idr_get_new_random(smb2req->sconn->smb2.sessions.idtree,
717 smb2req->sconn->smb2.sessions.limit);
719 return NT_STATUS_INSUFFICIENT_RESOURCES;
723 session->tcons.idtree = idr_init(session);
724 if (session->tcons.idtree == NULL) {
725 return NT_STATUS_NO_MEMORY;
727 session->tcons.limit = 0x0000FFFE;
728 session->tcons.list = NULL;
730 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, session,
731 struct smbd_smb2_session *);
732 session->sconn = smb2req->sconn;
733 talloc_set_destructor(session, smbd_smb2_session_destructor);
737 /* lookup an existing session */
738 p = idr_find(smb2req->sconn->smb2.sessions.idtree, in_session_id);
740 return NT_STATUS_USER_SESSION_DELETED;
742 session = talloc_get_type_abort(p, struct smbd_smb2_session);
745 if (NT_STATUS_IS_OK(session->status)) {
746 return NT_STATUS_REQUEST_NOT_ACCEPTED;
749 /* Handle either raw NTLMSSP or hand off the whole blob to
750 * GENSEC. The processing at this layer is essentially
751 * identical regardless. In particular, both rely only on the
752 * status code (not the contents of the packet) and do not
754 if (session->sconn->use_gensec_hook
755 || ntlmssp_blob_matches_magic(&in_security_buffer)) {
756 return smbd_smb2_raw_ntlmssp_auth(session,
763 } else if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
764 return smbd_smb2_spnego_negotiate(session,
771 } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
772 return smbd_smb2_spnego_auth(session,
781 /* Unknown packet type. */
782 DEBUG(1,("Unknown packet type %u in smb2 sessionsetup\n",
783 (unsigned int)in_security_buffer.data[0] ));
784 TALLOC_FREE(session->auth_ntlmssp_state);
785 TALLOC_FREE(session);
786 return NT_STATUS_LOGON_FAILURE;
789 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
794 status = smbd_smb2_request_verify_sizes(req, 0x04);
795 if (!NT_STATUS_IS_OK(status)) {
796 return smbd_smb2_request_error(req, status);
800 * TODO: cancel all outstanding requests on the session
801 * and delete all tree connections.
803 smbd_smb2_session_destructor(req->session);
805 * we may need to sign the response, so we need to keep
806 * the session until the response is sent to the wire.
808 talloc_steal(req, req->session);
810 outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
811 if (outbody.data == NULL) {
812 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
815 SSVAL(outbody.data, 0x00, 0x04); /* struct size */
816 SSVAL(outbody.data, 0x02, 0); /* reserved */
818 return smbd_smb2_request_done(req, outbody, NULL);