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 "smb_server/service_smb_proto.h"
28 #include "smbd/service_stream.h"
29 #include "lib/stream/packet.h"
30 #include "param/param.h"
33 /* initialise the auth_context for this server and return the cryptkey */
34 static NTSTATUS get_challenge(struct smbsrv_connection *smb_conn, uint8_t buff[8])
37 const uint8_t *challenge;
39 /* muliple negprots are not premitted */
40 if (smb_conn->negotiate.auth_context) {
41 DEBUG(3,("get challenge: is this a secondary negprot? auth_context is non-NULL!\n"));
42 return NT_STATUS_FOOBAR;
45 DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));
47 nt_status = auth_context_create(smb_conn,
48 smb_conn->connection->event.ctx,
49 smb_conn->connection->msg_ctx,
51 &smb_conn->negotiate.auth_context);
52 if (!NT_STATUS_IS_OK(nt_status)) {
53 DEBUG(0, ("auth_context_create() returned %s", nt_errstr(nt_status)));
57 nt_status = auth_get_challenge(smb_conn->negotiate.auth_context, &challenge);
58 if (!NT_STATUS_IS_OK(nt_status)) {
59 DEBUG(0, ("auth_get_challenge() returned %s", nt_errstr(nt_status)));
63 memcpy(buff, challenge, 8);
68 /****************************************************************************
69 Reply for the core protocol.
70 ****************************************************************************/
71 static void reply_corep(struct smbsrv_request *req, uint16_t choice)
73 smbsrv_setup_reply(req, 1, 0);
75 SSVAL(req->out.vwv, VWV(0), choice);
77 req->smb_conn->negotiate.protocol = PROTOCOL_CORE;
79 if (req->smb_conn->signing.mandatory_signing) {
80 smbsrv_terminate_connection(req->smb_conn,
81 "CORE does not support SMB signing, and it is mandatory\n");
85 smbsrv_send_reply(req);
88 /****************************************************************************
89 Reply for the coreplus protocol.
90 this is quite incomplete - we only fill in a small part of the reply, but as nobody uses
91 this any more it probably doesn't matter
92 ****************************************************************************/
93 static void reply_coreplus(struct smbsrv_request *req, uint16_t choice)
95 uint16_t raw = (lp_readraw(req->smb_conn->lp_ctx)?1:0) | (lp_writeraw(req->smb_conn->lp_ctx)?2:0);
97 smbsrv_setup_reply(req, 13, 0);
99 /* Reply, SMBlockread, SMBwritelock supported. */
100 SCVAL(req->out.hdr,HDR_FLG,
101 CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
103 SSVAL(req->out.vwv, VWV(0), choice);
104 SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */
106 /* tell redirector we support
107 readbraw and writebraw (possibly) */
108 SSVAL(req->out.vwv, VWV(5), raw);
110 req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS;
112 if (req->smb_conn->signing.mandatory_signing) {
113 smbsrv_terminate_connection(req->smb_conn,
114 "COREPLUS does not support SMB signing, and it is mandatory\n");
118 smbsrv_send_reply(req);
121 /****************************************************************************
122 Reply for the lanman 1.0 protocol.
123 ****************************************************************************/
124 static void reply_lanman1(struct smbsrv_request *req, uint16_t choice)
126 int raw = (lp_readraw(req->smb_conn->lp_ctx)?1:0) | (lp_writeraw(req->smb_conn->lp_ctx)?2:0);
128 time_t t = req->request_time.tv_sec;
130 req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(req->smb_conn->lp_ctx);
132 if (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE)
133 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
135 if (req->smb_conn->negotiate.encrypted_passwords)
136 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
138 req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1;
140 smbsrv_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0);
142 /* SMBlockread, SMBwritelock supported. */
143 SCVAL(req->out.hdr,HDR_FLG,
144 CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
146 SSVAL(req->out.vwv, VWV(0), choice);
147 SSVAL(req->out.vwv, VWV(1), secword);
148 SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
149 SSVAL(req->out.vwv, VWV(3), lp_maxmux(req->smb_conn->lp_ctx));
150 SSVAL(req->out.vwv, VWV(4), 1);
151 SSVAL(req->out.vwv, VWV(5), raw);
152 SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
153 srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
154 SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
155 SIVAL(req->out.vwv, VWV(11), 0); /* reserved */
157 /* Create a token value and add it to the outgoing packet. */
158 if (req->smb_conn->negotiate.encrypted_passwords) {
161 SSVAL(req->out.vwv, VWV(11), 8);
163 nt_status = get_challenge(req->smb_conn, req->out.data);
164 if (!NT_STATUS_IS_OK(nt_status)) {
165 smbsrv_terminate_connection(req->smb_conn, "LANMAN1 get_challenge failed\n");
170 if (req->smb_conn->signing.mandatory_signing) {
171 smbsrv_terminate_connection(req->smb_conn,
172 "LANMAN1 does not support SMB signing, and it is mandatory\n");
176 smbsrv_send_reply(req);
179 /****************************************************************************
180 Reply for the lanman 2.0 protocol.
181 ****************************************************************************/
182 static void reply_lanman2(struct smbsrv_request *req, uint16_t choice)
184 int raw = (lp_readraw(req->smb_conn->lp_ctx)?1:0) | (lp_writeraw(req->smb_conn->lp_ctx)?2:0);
186 time_t t = req->request_time.tv_sec;
188 req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(req->smb_conn->lp_ctx);
190 if (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE)
191 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
193 if (req->smb_conn->negotiate.encrypted_passwords)
194 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
196 req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2;
198 smbsrv_setup_reply(req, 13, 0);
200 SSVAL(req->out.vwv, VWV(0), choice);
201 SSVAL(req->out.vwv, VWV(1), secword);
202 SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
203 SSVAL(req->out.vwv, VWV(3), lp_maxmux(req->smb_conn->lp_ctx));
204 SSVAL(req->out.vwv, VWV(4), 1);
205 SSVAL(req->out.vwv, VWV(5), raw);
206 SIVAL(req->out.vwv, VWV(6), req->smb_conn->connection->server_id.id);
207 srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
208 SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
209 SIVAL(req->out.vwv, VWV(11), 0);
211 /* Create a token value and add it to the outgoing packet. */
212 if (req->smb_conn->negotiate.encrypted_passwords) {
213 SSVAL(req->out.vwv, VWV(11), 8);
214 req_grow_data(req, 8);
215 get_challenge(req->smb_conn, req->out.data);
218 req_push_str(req, NULL, lp_workgroup(req->smb_conn->lp_ctx), -1, STR_TERMINATE);
220 if (req->smb_conn->signing.mandatory_signing) {
221 smbsrv_terminate_connection(req->smb_conn,
222 "LANMAN2 does not support SMB signing, and it is mandatory\n");
226 smbsrv_send_reply(req);
229 static void reply_nt1_orig(struct smbsrv_request *req)
231 /* Create a token value and add it to the outgoing packet. */
232 if (req->smb_conn->negotiate.encrypted_passwords) {
233 req_grow_data(req, 8);
234 /* note that we do not send a challenge at all if
235 we are using plaintext */
236 get_challenge(req->smb_conn, req->out.ptr);
238 SCVAL(req->out.vwv+1, VWV(16), 8);
240 req_push_str(req, NULL, lp_workgroup(req->smb_conn->lp_ctx), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
241 req_push_str(req, NULL, lp_netbios_name(req->smb_conn->lp_ctx), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
242 DEBUG(3,("not using extended security (SPNEGO or NTLMSSP)\n"));
245 /****************************************************************************
246 Reply for the nt protocol.
247 ****************************************************************************/
248 static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
250 /* dual names + lock_and_read + nt SMBs + remote API calls */
253 time_t t = req->request_time.tv_sec;
255 bool negotiate_spnego = false;
256 char *large_test_path;
258 unix_to_nt_time(&nttime, t);
261 CAP_NT_FIND | CAP_LOCK_AND_READ |
262 CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
264 req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(req->smb_conn->lp_ctx);
266 /* do spnego in user level security if the client
267 supports it and we can do encrypted passwords */
269 if (req->smb_conn->negotiate.encrypted_passwords &&
270 (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE) &&
271 lp_use_spnego(req->smb_conn->lp_ctx) &&
272 (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
273 negotiate_spnego = true;
274 capabilities |= CAP_EXTENDED_SECURITY;
277 if (lp_unix_extensions(req->smb_conn->lp_ctx)) {
278 capabilities |= CAP_UNIX;
281 if (lp_large_readwrite(req->smb_conn->lp_ctx)) {
282 capabilities |= CAP_LARGE_READX | CAP_LARGE_WRITEX | CAP_W2K_SMBS;
285 large_test_path = lock_path(req, req->smb_conn->lp_ctx, "large_test.dat");
286 if (large_file_support(large_test_path)) {
287 capabilities |= CAP_LARGE_FILES;
290 if (lp_readraw(req->smb_conn->lp_ctx) &&
291 lp_writeraw(req->smb_conn->lp_ctx)) {
292 capabilities |= CAP_RAW_MODE;
295 /* allow for disabling unicode */
296 if (lp_unicode(req->smb_conn->lp_ctx)) {
297 capabilities |= CAP_UNICODE;
300 if (lp_nt_status_support(req->smb_conn->lp_ctx)) {
301 capabilities |= CAP_STATUS32;
304 if (lp_host_msdfs(req->smb_conn->lp_ctx)) {
305 capabilities |= CAP_DFS;
308 if (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE) {
309 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
312 if (req->smb_conn->negotiate.encrypted_passwords) {
313 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
316 if (req->smb_conn->signing.allow_smb_signing) {
317 secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
320 if (req->smb_conn->signing.mandatory_signing) {
321 secword |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
324 req->smb_conn->negotiate.protocol = PROTOCOL_NT1;
326 smbsrv_setup_reply(req, 17, 0);
328 SSVAL(req->out.vwv, VWV(0), choice);
329 SCVAL(req->out.vwv, VWV(1), secword);
331 /* notice the strange +1 on vwv here? That's because
332 this is the one and only SMB packet that is malformed in
333 the specification - all the command words after the secword
334 are offset by 1 byte */
335 SSVAL(req->out.vwv+1, VWV(1), lp_maxmux(req->smb_conn->lp_ctx));
336 SSVAL(req->out.vwv+1, VWV(2), 1); /* num vcs */
337 SIVAL(req->out.vwv+1, VWV(3), req->smb_conn->negotiate.max_recv);
338 SIVAL(req->out.vwv+1, VWV(5), 0x10000); /* raw size. full 64k */
339 SIVAL(req->out.vwv+1, VWV(7), req->smb_conn->connection->server_id.id); /* session key */
340 SIVAL(req->out.vwv+1, VWV(9), capabilities);
341 push_nttime(req->out.vwv+1, VWV(11), nttime);
342 SSVALS(req->out.vwv+1,VWV(15), req->smb_conn->negotiate.zone_offset/60);
344 if (!negotiate_spnego) {
347 struct cli_credentials *server_credentials;
348 struct gensec_security *gensec_security;
349 DATA_BLOB null_data_blob = data_blob(NULL, 0);
354 nt_status = gensec_server_start(req->smb_conn,
355 req->smb_conn->connection->event.ctx,
356 req->smb_conn->lp_ctx,
357 req->smb_conn->connection->msg_ctx,
359 if (!NT_STATUS_IS_OK(nt_status)) {
360 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
361 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
365 if (req->smb_conn->negotiate.auth_context) {
366 smbsrv_terminate_connection(req->smb_conn, "reply_nt1: is this a secondary negprot? auth_context is non-NULL!\n");
371 = cli_credentials_init(req);
372 if (!server_credentials) {
373 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
377 cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx);
378 nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx);
379 if (!NT_STATUS_IS_OK(nt_status)) {
380 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
381 talloc_free(server_credentials);
382 server_credentials = NULL;
385 req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
387 gensec_set_target_service(gensec_security, "cifs");
389 gensec_set_credentials(gensec_security, server_credentials);
391 oid = GENSEC_OID_SPNEGO;
392 nt_status = gensec_start_mech_by_oid(gensec_security, oid);
394 if (NT_STATUS_IS_OK(nt_status)) {
395 /* Get and push the proposed OID list into the packets */
396 nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
398 if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
399 DEBUG(1, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
403 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
404 DEBUG(3,("using SPNEGO\n"));
406 DEBUG(5, ("Failed to start SPNEGO, falling back to NTLMSSP only: %s\n", nt_errstr(nt_status)));
407 oid = GENSEC_OID_NTLMSSP;
408 nt_status = gensec_start_mech_by_oid(gensec_security, oid);
410 if (!NT_STATUS_IS_OK(nt_status)) {
411 DEBUG(0, ("Failed to start SPNEGO as well as NTLMSSP fallback: %s\n", nt_errstr(nt_status)));
415 /* NTLMSSP is a client-first exchange */
416 blob = data_blob(NULL, 0);
417 DEBUG(3,("using raw-NTLMSSP\n"));
420 req->smb_conn->negotiate.oid = oid;
422 req_grow_data(req, blob.length + 16);
423 /* a NOT very random guid, perhaps we should get it
424 * from the credentials (kitchen sink...) */
425 memset(req->out.ptr, '\0', 16);
428 memcpy(req->out.ptr, blob.data, blob.length);
429 SCVAL(req->out.vwv+1, VWV(16), blob.length + 16);
430 req->out.ptr += blob.length;
433 smbsrv_send_reply_nosign(req);
436 /****************************************************************************
437 Reply for the SMB2 2.001 protocol
438 ****************************************************************************/
439 static void reply_smb2(struct smbsrv_request *req, uint16_t choice)
441 struct smbsrv_connection *smb_conn = req->smb_conn;
444 talloc_free(smb_conn->sessions.idtree_vuid);
445 ZERO_STRUCT(smb_conn->sessions);
446 talloc_free(smb_conn->smb_tcons.idtree_tid);
447 ZERO_STRUCT(smb_conn->smb_tcons);
448 ZERO_STRUCT(smb_conn->signing);
450 /* reply with a SMB2 packet */
451 status = smbsrv_init_smb2_connection(smb_conn);
452 if (!NT_STATUS_IS_OK(status)) {
453 smbsrv_terminate_connection(smb_conn, nt_errstr(status));
457 packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
458 smb2srv_reply_smb_negprot(req);
462 /* List of supported protocols, most desired first */
463 static const struct {
464 const char *proto_name;
465 const char *short_name;
466 void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice);
468 } supported_protocols[] = {
469 {"SMB 2.001", "SMB2", reply_smb2, PROTOCOL_SMB2},
470 {"NT LANMAN 1.0", "NT1", reply_nt1, PROTOCOL_NT1},
471 {"NT LM 0.12", "NT1", reply_nt1, PROTOCOL_NT1},
472 {"LANMAN2.1", "LANMAN2", reply_lanman2, PROTOCOL_LANMAN2},
473 {"LM1.2X002", "LANMAN2", reply_lanman2, PROTOCOL_LANMAN2},
474 {"Samba", "LANMAN2", reply_lanman2, PROTOCOL_LANMAN2},
475 {"DOS LM1.2X002", "LANMAN2", reply_lanman2, PROTOCOL_LANMAN2},
476 {"Windows for Workgroups 3.1a", "LANMAN1", reply_lanman1, PROTOCOL_LANMAN1},
477 {"LANMAN1.0", "LANMAN1", reply_lanman1, PROTOCOL_LANMAN1},
478 {"MICROSOFT NETWORKS 3.0", "LANMAN1", reply_lanman1, PROTOCOL_LANMAN1},
479 {"MICROSOFT NETWORKS 1.03", "COREPLUS", reply_coreplus, PROTOCOL_COREPLUS},
480 {"PC NETWORK PROGRAM 1.0", "CORE", reply_corep, PROTOCOL_CORE},
484 /****************************************************************************
486 ****************************************************************************/
488 void smbsrv_reply_negprot(struct smbsrv_request *req)
492 uint32_t protos_count = 0;
493 char **protos = NULL;
495 if (req->smb_conn->negotiate.done_negprot) {
496 smbsrv_terminate_connection(req->smb_conn, "multiple negprot's are not permitted");
499 req->smb_conn->negotiate.done_negprot = true;
505 protos = talloc_realloc(req, protos, char *, protos_count + 1);
507 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
510 protos[protos_count] = NULL;
511 len = req_pull_ascii4(req, (const char **)&protos[protos_count], p, STR_ASCII|STR_TERMINATE);
513 if (len == 0 || !protos[protos_count]) break;
515 DEBUG(5,("Requested protocol [%d][%s]\n", protos_count, protos[protos_count]));
519 /* Check for protocols, most desirable first */
520 for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
523 if (supported_protocols[protocol].protocol_level > lp_srv_maxprotocol(req->smb_conn->lp_ctx))
525 if (supported_protocols[protocol].protocol_level < lp_srv_minprotocol(req->smb_conn->lp_ctx))
528 for (i = 0; i < protos_count; i++) {
529 if (strcmp(supported_protocols[protocol].proto_name, protos[i]) != 0) continue;
531 supported_protocols[protocol].proto_reply_fn(req, i);
532 DEBUG(3,("Selected protocol [%d][%s]\n",
533 i, supported_protocols[protocol].proto_name));
538 smbsrv_terminate_connection(req->smb_conn, "No protocol supported !");