2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "auth/credentials/credentials.h"
22 #include "auth/gensec/gensec.h"
23 #include "auth/auth.h"
24 #include "smb_server/smb_server.h"
25 #include "libcli/smb2/smb2.h"
26 #include "smb_server/smb2/smb2_server.h"
27 #include "smbd/service_stream.h"
28 #include "lib/stream/packet.h"
29 #include "param/param.h"
32 /* initialise the auth_context for this server and return the cryptkey */
33 static NTSTATUS
get_challenge(struct smbsrv_connection
*smb_conn
, uint8_t buff
[8])
36 const uint8_t *challenge
;
38 /* muliple negprots are not premitted */
39 if (smb_conn
->negotiate
.auth_context
) {
40 DEBUG(3,("get challenge: is this a secondary negprot? auth_context is non-NULL!\n"));
41 return NT_STATUS_FOOBAR
;
44 DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));
46 nt_status
= auth_context_create(smb_conn
,
47 smb_conn
->connection
->event
.ctx
,
48 smb_conn
->connection
->msg_ctx
,
50 &smb_conn
->negotiate
.auth_context
);
51 if (!NT_STATUS_IS_OK(nt_status
)) {
52 DEBUG(0, ("auth_context_create() returned %s", nt_errstr(nt_status
)));
56 nt_status
= auth_get_challenge(smb_conn
->negotiate
.auth_context
, &challenge
);
57 if (!NT_STATUS_IS_OK(nt_status
)) {
58 DEBUG(0, ("auth_get_challenge() returned %s", nt_errstr(nt_status
)));
62 memcpy(buff
, challenge
, 8);
67 /****************************************************************************
68 Reply for the core protocol.
69 ****************************************************************************/
70 static void reply_corep(struct smbsrv_request
*req
, uint16_t choice
)
72 smbsrv_setup_reply(req
, 1, 0);
74 SSVAL(req
->out
.vwv
, VWV(0), choice
);
76 req
->smb_conn
->negotiate
.protocol
= PROTOCOL_CORE
;
78 if (req
->smb_conn
->signing
.mandatory_signing
) {
79 smbsrv_terminate_connection(req
->smb_conn
,
80 "CORE does not support SMB signing, and it is mandatory\n");
84 smbsrv_send_reply(req
);
87 /****************************************************************************
88 Reply for the coreplus protocol.
89 this is quite incomplete - we only fill in a small part of the reply, but as nobody uses
90 this any more it probably doesn't matter
91 ****************************************************************************/
92 static void reply_coreplus(struct smbsrv_request
*req
, uint16_t choice
)
94 uint16_t raw
= (lp_readraw(req
->smb_conn
->lp_ctx
)?1:0) | (lp_writeraw(req
->smb_conn
->lp_ctx
)?2:0);
96 smbsrv_setup_reply(req
, 13, 0);
98 /* Reply, SMBlockread, SMBwritelock supported. */
99 SCVAL(req
->out
.hdr
,HDR_FLG
,
100 CVAL(req
->out
.hdr
, HDR_FLG
) | FLAG_SUPPORT_LOCKREAD
);
102 SSVAL(req
->out
.vwv
, VWV(0), choice
);
103 SSVAL(req
->out
.vwv
, VWV(1), 0x1); /* user level security, don't encrypt */
105 /* tell redirector we support
106 readbraw and writebraw (possibly) */
107 SSVAL(req
->out
.vwv
, VWV(5), raw
);
109 req
->smb_conn
->negotiate
.protocol
= PROTOCOL_COREPLUS
;
111 if (req
->smb_conn
->signing
.mandatory_signing
) {
112 smbsrv_terminate_connection(req
->smb_conn
,
113 "COREPLUS does not support SMB signing, and it is mandatory\n");
117 smbsrv_send_reply(req
);
120 /****************************************************************************
121 Reply for the lanman 1.0 protocol.
122 ****************************************************************************/
123 static void reply_lanman1(struct smbsrv_request
*req
, uint16_t choice
)
125 int raw
= (lp_readraw(req
->smb_conn
->lp_ctx
)?1:0) | (lp_writeraw(req
->smb_conn
->lp_ctx
)?2:0);
127 time_t t
= req
->request_time
.tv_sec
;
129 req
->smb_conn
->negotiate
.encrypted_passwords
= lp_encrypted_passwords(req
->smb_conn
->lp_ctx
);
131 if (lp_security(req
->smb_conn
->lp_ctx
) != SEC_SHARE
)
132 secword
|= NEGOTIATE_SECURITY_USER_LEVEL
;
134 if (req
->smb_conn
->negotiate
.encrypted_passwords
)
135 secword
|= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE
;
137 req
->smb_conn
->negotiate
.protocol
= PROTOCOL_LANMAN1
;
139 smbsrv_setup_reply(req
, 13, req
->smb_conn
->negotiate
.encrypted_passwords
? 8 : 0);
141 /* SMBlockread, SMBwritelock supported. */
142 SCVAL(req
->out
.hdr
,HDR_FLG
,
143 CVAL(req
->out
.hdr
, HDR_FLG
) | FLAG_SUPPORT_LOCKREAD
);
145 SSVAL(req
->out
.vwv
, VWV(0), choice
);
146 SSVAL(req
->out
.vwv
, VWV(1), secword
);
147 SSVAL(req
->out
.vwv
, VWV(2), req
->smb_conn
->negotiate
.max_recv
);
148 SSVAL(req
->out
.vwv
, VWV(3), lp_maxmux(req
->smb_conn
->lp_ctx
));
149 SSVAL(req
->out
.vwv
, VWV(4), 1);
150 SSVAL(req
->out
.vwv
, VWV(5), raw
);
151 SIVAL(req
->out
.vwv
, VWV(6), req
->smb_conn
->connection
->server_id
.id
);
152 srv_push_dos_date(req
->smb_conn
, req
->out
.vwv
, VWV(8), t
);
153 SSVAL(req
->out
.vwv
, VWV(10), req
->smb_conn
->negotiate
.zone_offset
/60);
154 SIVAL(req
->out
.vwv
, VWV(11), 0); /* reserved */
156 /* Create a token value and add it to the outgoing packet. */
157 if (req
->smb_conn
->negotiate
.encrypted_passwords
) {
160 SSVAL(req
->out
.vwv
, VWV(11), 8);
162 nt_status
= get_challenge(req
->smb_conn
, req
->out
.data
);
163 if (!NT_STATUS_IS_OK(nt_status
)) {
164 smbsrv_terminate_connection(req
->smb_conn
, "LANMAN1 get_challenge failed\n");
169 if (req
->smb_conn
->signing
.mandatory_signing
) {
170 smbsrv_terminate_connection(req
->smb_conn
,
171 "LANMAN1 does not support SMB signing, and it is mandatory\n");
175 smbsrv_send_reply(req
);
178 /****************************************************************************
179 Reply for the lanman 2.0 protocol.
180 ****************************************************************************/
181 static void reply_lanman2(struct smbsrv_request
*req
, uint16_t choice
)
183 int raw
= (lp_readraw(req
->smb_conn
->lp_ctx
)?1:0) | (lp_writeraw(req
->smb_conn
->lp_ctx
)?2:0);
185 time_t t
= req
->request_time
.tv_sec
;
187 req
->smb_conn
->negotiate
.encrypted_passwords
= lp_encrypted_passwords(req
->smb_conn
->lp_ctx
);
189 if (lp_security(req
->smb_conn
->lp_ctx
) != SEC_SHARE
)
190 secword
|= NEGOTIATE_SECURITY_USER_LEVEL
;
192 if (req
->smb_conn
->negotiate
.encrypted_passwords
)
193 secword
|= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE
;
195 req
->smb_conn
->negotiate
.protocol
= PROTOCOL_LANMAN2
;
197 smbsrv_setup_reply(req
, 13, 0);
199 SSVAL(req
->out
.vwv
, VWV(0), choice
);
200 SSVAL(req
->out
.vwv
, VWV(1), secword
);
201 SSVAL(req
->out
.vwv
, VWV(2), req
->smb_conn
->negotiate
.max_recv
);
202 SSVAL(req
->out
.vwv
, VWV(3), lp_maxmux(req
->smb_conn
->lp_ctx
));
203 SSVAL(req
->out
.vwv
, VWV(4), 1);
204 SSVAL(req
->out
.vwv
, VWV(5), raw
);
205 SIVAL(req
->out
.vwv
, VWV(6), req
->smb_conn
->connection
->server_id
.id
);
206 srv_push_dos_date(req
->smb_conn
, req
->out
.vwv
, VWV(8), t
);
207 SSVAL(req
->out
.vwv
, VWV(10), req
->smb_conn
->negotiate
.zone_offset
/60);
208 SIVAL(req
->out
.vwv
, VWV(11), 0);
210 /* Create a token value and add it to the outgoing packet. */
211 if (req
->smb_conn
->negotiate
.encrypted_passwords
) {
212 SSVAL(req
->out
.vwv
, VWV(11), 8);
213 req_grow_data(req
, 8);
214 get_challenge(req
->smb_conn
, req
->out
.data
);
217 req_push_str(req
, NULL
, lp_workgroup(req
->smb_conn
->lp_ctx
), -1, STR_TERMINATE
);
219 if (req
->smb_conn
->signing
.mandatory_signing
) {
220 smbsrv_terminate_connection(req
->smb_conn
,
221 "LANMAN2 does not support SMB signing, and it is mandatory\n");
225 smbsrv_send_reply(req
);
228 static void reply_nt1_orig(struct smbsrv_request
*req
)
230 /* Create a token value and add it to the outgoing packet. */
231 if (req
->smb_conn
->negotiate
.encrypted_passwords
) {
232 req_grow_data(req
, 8);
233 /* note that we do not send a challenge at all if
234 we are using plaintext */
235 get_challenge(req
->smb_conn
, req
->out
.ptr
);
237 SCVAL(req
->out
.vwv
+1, VWV(16), 8);
239 req_push_str(req
, NULL
, lp_workgroup(req
->smb_conn
->lp_ctx
), -1, STR_UNICODE
|STR_TERMINATE
|STR_NOALIGN
);
240 req_push_str(req
, NULL
, lp_netbios_name(req
->smb_conn
->lp_ctx
), -1, STR_UNICODE
|STR_TERMINATE
|STR_NOALIGN
);
241 DEBUG(3,("not using extended security (SPNEGO or NTLMSSP)\n"));
244 /****************************************************************************
245 Reply for the nt protocol.
246 ****************************************************************************/
247 static void reply_nt1(struct smbsrv_request
*req
, uint16_t choice
)
249 /* dual names + lock_and_read + nt SMBs + remote API calls */
252 time_t t
= req
->request_time
.tv_sec
;
254 bool negotiate_spnego
= false;
255 char *large_test_path
;
257 unix_to_nt_time(&nttime
, t
);
260 CAP_NT_FIND
| CAP_LOCK_AND_READ
|
261 CAP_LEVEL_II_OPLOCKS
| CAP_NT_SMBS
| CAP_RPC_REMOTE_APIS
;
263 req
->smb_conn
->negotiate
.encrypted_passwords
= lp_encrypted_passwords(req
->smb_conn
->lp_ctx
);
265 /* do spnego in user level security if the client
266 supports it and we can do encrypted passwords */
268 if (req
->smb_conn
->negotiate
.encrypted_passwords
&&
269 (lp_security(req
->smb_conn
->lp_ctx
) != SEC_SHARE
) &&
270 lp_use_spnego(req
->smb_conn
->lp_ctx
) &&
271 (req
->flags2
& FLAGS2_EXTENDED_SECURITY
)) {
272 negotiate_spnego
= true;
273 capabilities
|= CAP_EXTENDED_SECURITY
;
276 if (lp_unix_extensions(req
->smb_conn
->lp_ctx
)) {
277 capabilities
|= CAP_UNIX
;
280 if (lp_large_readwrite(req
->smb_conn
->lp_ctx
)) {
281 capabilities
|= CAP_LARGE_READX
| CAP_LARGE_WRITEX
| CAP_W2K_SMBS
;
284 large_test_path
= lock_path(req
, req
->smb_conn
->lp_ctx
, "large_test.dat");
285 if (large_file_support(large_test_path
)) {
286 capabilities
|= CAP_LARGE_FILES
;
289 if (lp_readraw(req
->smb_conn
->lp_ctx
) &&
290 lp_writeraw(req
->smb_conn
->lp_ctx
)) {
291 capabilities
|= CAP_RAW_MODE
;
294 /* allow for disabling unicode */
295 if (lp_unicode(req
->smb_conn
->lp_ctx
)) {
296 capabilities
|= CAP_UNICODE
;
299 if (lp_nt_status_support(req
->smb_conn
->lp_ctx
)) {
300 capabilities
|= CAP_STATUS32
;
303 if (lp_host_msdfs(req
->smb_conn
->lp_ctx
)) {
304 capabilities
|= CAP_DFS
;
307 if (lp_security(req
->smb_conn
->lp_ctx
) != SEC_SHARE
) {
308 secword
|= NEGOTIATE_SECURITY_USER_LEVEL
;
311 if (req
->smb_conn
->negotiate
.encrypted_passwords
) {
312 secword
|= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE
;
315 if (req
->smb_conn
->signing
.allow_smb_signing
) {
316 secword
|= NEGOTIATE_SECURITY_SIGNATURES_ENABLED
;
319 if (req
->smb_conn
->signing
.mandatory_signing
) {
320 secword
|= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED
;
323 req
->smb_conn
->negotiate
.protocol
= PROTOCOL_NT1
;
325 smbsrv_setup_reply(req
, 17, 0);
327 SSVAL(req
->out
.vwv
, VWV(0), choice
);
328 SCVAL(req
->out
.vwv
, VWV(1), secword
);
330 /* notice the strange +1 on vwv here? That's because
331 this is the one and only SMB packet that is malformed in
332 the specification - all the command words after the secword
333 are offset by 1 byte */
334 SSVAL(req
->out
.vwv
+1, VWV(1), lp_maxmux(req
->smb_conn
->lp_ctx
));
335 SSVAL(req
->out
.vwv
+1, VWV(2), 1); /* num vcs */
336 SIVAL(req
->out
.vwv
+1, VWV(3), req
->smb_conn
->negotiate
.max_recv
);
337 SIVAL(req
->out
.vwv
+1, VWV(5), 0x10000); /* raw size. full 64k */
338 SIVAL(req
->out
.vwv
+1, VWV(7), req
->smb_conn
->connection
->server_id
.id
); /* session key */
339 SIVAL(req
->out
.vwv
+1, VWV(9), capabilities
);
340 push_nttime(req
->out
.vwv
+1, VWV(11), nttime
);
341 SSVALS(req
->out
.vwv
+1,VWV(15), req
->smb_conn
->negotiate
.zone_offset
/60);
343 if (!negotiate_spnego
) {
346 struct cli_credentials
*server_credentials
;
347 struct gensec_security
*gensec_security
;
348 DATA_BLOB null_data_blob
= data_blob(NULL
, 0);
354 = cli_credentials_init(req
);
355 if (!server_credentials
) {
356 smbsrv_terminate_connection(req
->smb_conn
, "Failed to init server credentials\n");
360 cli_credentials_set_conf(server_credentials
, req
->smb_conn
->lp_ctx
);
361 nt_status
= cli_credentials_set_machine_account(server_credentials
, req
->smb_conn
->lp_ctx
);
362 if (!NT_STATUS_IS_OK(nt_status
)) {
363 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status
)));
364 talloc_free(server_credentials
);
365 server_credentials
= NULL
;
368 nt_status
= samba_server_gensec_start(req
,
369 req
->smb_conn
->connection
->event
.ctx
,
370 req
->smb_conn
->connection
->msg_ctx
,
371 req
->smb_conn
->lp_ctx
,
376 if (!NT_STATUS_IS_OK(nt_status
)) {
377 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status
)));
378 smbsrv_terminate_connection(req
->smb_conn
, "Failed to start GENSEC\n");
382 if (req
->smb_conn
->negotiate
.auth_context
) {
383 smbsrv_terminate_connection(req
->smb_conn
, "reply_nt1: is this a secondary negprot? auth_context is non-NULL!\n");
386 req
->smb_conn
->negotiate
.server_credentials
= talloc_reparent(req
, req
->smb_conn
, server_credentials
);
388 gensec_set_target_service(gensec_security
, "cifs");
390 gensec_set_credentials(gensec_security
, server_credentials
);
392 oid
= GENSEC_OID_SPNEGO
;
393 nt_status
= gensec_start_mech_by_oid(gensec_security
, oid
);
395 if (NT_STATUS_IS_OK(nt_status
)) {
396 /* Get and push the proposed OID list into the packets */
397 nt_status
= gensec_update(gensec_security
, req
, null_data_blob
, &blob
);
399 if (!NT_STATUS_IS_OK(nt_status
) && !NT_STATUS_EQUAL(nt_status
, NT_STATUS_MORE_PROCESSING_REQUIRED
)) {
400 DEBUG(1, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status
)));
404 if (NT_STATUS_EQUAL(nt_status
, NT_STATUS_MORE_PROCESSING_REQUIRED
)) {
405 DEBUG(3,("using SPNEGO\n"));
407 DEBUG(5, ("Failed to start SPNEGO, falling back to NTLMSSP only: %s\n", nt_errstr(nt_status
)));
408 oid
= GENSEC_OID_NTLMSSP
;
409 nt_status
= gensec_start_mech_by_oid(gensec_security
, oid
);
411 if (!NT_STATUS_IS_OK(nt_status
)) {
412 DEBUG(0, ("Failed to start SPNEGO as well as NTLMSSP fallback: %s\n", nt_errstr(nt_status
)));
416 /* NTLMSSP is a client-first exchange */
417 blob
= data_blob(NULL
, 0);
418 DEBUG(3,("using raw-NTLMSSP\n"));
421 req
->smb_conn
->negotiate
.oid
= oid
;
423 req_grow_data(req
, blob
.length
+ 16);
424 /* a NOT very random guid, perhaps we should get it
425 * from the credentials (kitchen sink...) */
426 memset(req
->out
.ptr
, '\0', 16);
429 memcpy(req
->out
.ptr
, blob
.data
, blob
.length
);
430 SCVAL(req
->out
.vwv
+1, VWV(16), blob
.length
+ 16);
431 req
->out
.ptr
+= blob
.length
;
434 smbsrv_send_reply_nosign(req
);
437 /****************************************************************************
438 Reply for the SMB2 2.001 protocol
439 ****************************************************************************/
440 static void reply_smb2(struct smbsrv_request
*req
, uint16_t choice
)
442 struct smbsrv_connection
*smb_conn
= req
->smb_conn
;
445 talloc_free(smb_conn
->sessions
.idtree_vuid
);
446 ZERO_STRUCT(smb_conn
->sessions
);
447 talloc_free(smb_conn
->smb_tcons
.idtree_tid
);
448 ZERO_STRUCT(smb_conn
->smb_tcons
);
449 ZERO_STRUCT(smb_conn
->signing
);
451 /* reply with a SMB2 packet */
452 status
= smbsrv_init_smb2_connection(smb_conn
);
453 if (!NT_STATUS_IS_OK(status
)) {
454 smbsrv_terminate_connection(smb_conn
, nt_errstr(status
));
458 packet_set_callback(smb_conn
->packet
, smbsrv_recv_smb2_request
);
459 smb2srv_reply_smb_negprot(req
);
463 /* List of supported protocols, most desired first */
464 static const struct {
465 const char *proto_name
;
466 const char *short_name
;
467 void (*proto_reply_fn
)(struct smbsrv_request
*req
, uint16_t choice
);
469 } supported_protocols
[] = {
470 {"SMB 2.002", "SMB2", reply_smb2
, PROTOCOL_SMB2
},
471 {"NT LANMAN 1.0", "NT1", reply_nt1
, PROTOCOL_NT1
},
472 {"NT LM 0.12", "NT1", reply_nt1
, PROTOCOL_NT1
},
473 {"LANMAN2.1", "LANMAN2", reply_lanman2
, PROTOCOL_LANMAN2
},
474 {"LM1.2X002", "LANMAN2", reply_lanman2
, PROTOCOL_LANMAN2
},
475 {"Samba", "LANMAN2", reply_lanman2
, PROTOCOL_LANMAN2
},
476 {"DOS LM1.2X002", "LANMAN2", reply_lanman2
, PROTOCOL_LANMAN2
},
477 {"Windows for Workgroups 3.1a", "LANMAN1", reply_lanman1
, PROTOCOL_LANMAN1
},
478 {"LANMAN1.0", "LANMAN1", reply_lanman1
, PROTOCOL_LANMAN1
},
479 {"MICROSOFT NETWORKS 3.0", "LANMAN1", reply_lanman1
, PROTOCOL_LANMAN1
},
480 {"MICROSOFT NETWORKS 1.03", "COREPLUS", reply_coreplus
, PROTOCOL_COREPLUS
},
481 {"PC NETWORK PROGRAM 1.0", "CORE", reply_corep
, PROTOCOL_CORE
},
485 /****************************************************************************
487 ****************************************************************************/
489 void smbsrv_reply_negprot(struct smbsrv_request
*req
)
493 uint32_t protos_count
= 0;
494 char **protos
= NULL
;
496 if (req
->smb_conn
->negotiate
.done_negprot
) {
497 smbsrv_terminate_connection(req
->smb_conn
, "multiple negprot's are not permitted");
500 req
->smb_conn
->negotiate
.done_negprot
= true;
506 protos
= talloc_realloc(req
, protos
, char *, protos_count
+ 1);
508 smbsrv_terminate_connection(req
->smb_conn
, nt_errstr(NT_STATUS_NO_MEMORY
));
511 protos
[protos_count
] = NULL
;
512 len
= req_pull_ascii4(&req
->in
.bufinfo
, (const char **)&protos
[protos_count
], p
, STR_ASCII
|STR_TERMINATE
);
514 if (len
== 0 || !protos
[protos_count
]) break;
516 DEBUG(5,("Requested protocol [%d][%s]\n", protos_count
, protos
[protos_count
]));
520 /* Check for protocols, most desirable first */
521 for (protocol
= 0; supported_protocols
[protocol
].proto_name
; protocol
++) {
524 if (supported_protocols
[protocol
].protocol_level
> lp_srv_maxprotocol(req
->smb_conn
->lp_ctx
))
526 if (supported_protocols
[protocol
].protocol_level
< lp_srv_minprotocol(req
->smb_conn
->lp_ctx
))
529 for (i
= 0; i
< protos_count
; i
++) {
530 if (strcmp(supported_protocols
[protocol
].proto_name
, protos
[i
]) != 0) continue;
532 supported_protocols
[protocol
].proto_reply_fn(req
, i
);
533 DEBUG(3,("Selected protocol [%d][%s]\n",
534 i
, supported_protocols
[protocol
].proto_name
));
539 smbsrv_terminate_connection(req
->smb_conn
, "No protocol supported !");