source: branches/samba-3.5.x/source4/smb_server/smb/negprot.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 18.1 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 negprot reply code
4 Copyright (C) Andrew Tridgell 1992-1998
5
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.
10
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.
15
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/>.
18*/
19
20#include "includes.h"
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"
30
31
32/* initialise the auth_context for this server and return the cryptkey */
33static NTSTATUS get_challenge(struct smbsrv_connection *smb_conn, uint8_t buff[8])
34{
35 NTSTATUS nt_status;
36 const uint8_t *challenge;
37
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;
42 }
43
44 DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));
45
46 nt_status = auth_context_create(smb_conn,
47 smb_conn->connection->event.ctx,
48 smb_conn->connection->msg_ctx,
49 smb_conn->lp_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)));
53 return nt_status;
54 }
55
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)));
59 return nt_status;
60 }
61
62 memcpy(buff, challenge, 8);
63
64 return NT_STATUS_OK;
65}
66
67/****************************************************************************
68 Reply for the core protocol.
69****************************************************************************/
70static void reply_corep(struct smbsrv_request *req, uint16_t choice)
71{
72 smbsrv_setup_reply(req, 1, 0);
73
74 SSVAL(req->out.vwv, VWV(0), choice);
75
76 req->smb_conn->negotiate.protocol = PROTOCOL_CORE;
77
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");
81 return;
82 }
83
84 smbsrv_send_reply(req);
85}
86
87/****************************************************************************
88 Reply for the coreplus protocol.
89this is quite incomplete - we only fill in a small part of the reply, but as nobody uses
90this any more it probably doesn't matter
91****************************************************************************/
92static void reply_coreplus(struct smbsrv_request *req, uint16_t choice)
93{
94 uint16_t raw = (lp_readraw(req->smb_conn->lp_ctx)?1:0) | (lp_writeraw(req->smb_conn->lp_ctx)?2:0);
95
96 smbsrv_setup_reply(req, 13, 0);
97
98 /* Reply, SMBlockread, SMBwritelock supported. */
99 SCVAL(req->out.hdr,HDR_FLG,
100 CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
101
102 SSVAL(req->out.vwv, VWV(0), choice);
103 SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */
104
105 /* tell redirector we support
106 readbraw and writebraw (possibly) */
107 SSVAL(req->out.vwv, VWV(5), raw);
108
109 req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS;
110
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");
114 return;
115 }
116
117 smbsrv_send_reply(req);
118}
119
120/****************************************************************************
121 Reply for the lanman 1.0 protocol.
122****************************************************************************/
123static void reply_lanman1(struct smbsrv_request *req, uint16_t choice)
124{
125 int raw = (lp_readraw(req->smb_conn->lp_ctx)?1:0) | (lp_writeraw(req->smb_conn->lp_ctx)?2:0);
126 int secword=0;
127 time_t t = req->request_time.tv_sec;
128
129 req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(req->smb_conn->lp_ctx);
130
131 if (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE)
132 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
133
134 if (req->smb_conn->negotiate.encrypted_passwords)
135 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
136
137 req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1;
138
139 smbsrv_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0);
140
141 /* SMBlockread, SMBwritelock supported. */
142 SCVAL(req->out.hdr,HDR_FLG,
143 CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);
144
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 */
155
156 /* Create a token value and add it to the outgoing packet. */
157 if (req->smb_conn->negotiate.encrypted_passwords) {
158 NTSTATUS nt_status;
159
160 SSVAL(req->out.vwv, VWV(11), 8);
161
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");
165 return;
166 }
167 }
168
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");
172 return;
173 }
174
175 smbsrv_send_reply(req);
176}
177
178/****************************************************************************
179 Reply for the lanman 2.0 protocol.
180****************************************************************************/
181static void reply_lanman2(struct smbsrv_request *req, uint16_t choice)
182{
183 int raw = (lp_readraw(req->smb_conn->lp_ctx)?1:0) | (lp_writeraw(req->smb_conn->lp_ctx)?2:0);
184 int secword=0;
185 time_t t = req->request_time.tv_sec;
186
187 req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(req->smb_conn->lp_ctx);
188
189 if (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE)
190 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
191
192 if (req->smb_conn->negotiate.encrypted_passwords)
193 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
194
195 req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2;
196
197 smbsrv_setup_reply(req, 13, 0);
198
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);
209
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);
215 }
216
217 req_push_str(req, NULL, lp_workgroup(req->smb_conn->lp_ctx), -1, STR_TERMINATE);
218
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");
222 return;
223 }
224
225 smbsrv_send_reply(req);
226}
227
228static void reply_nt1_orig(struct smbsrv_request *req)
229{
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);
236 req->out.ptr += 8;
237 SCVAL(req->out.vwv+1, VWV(16), 8);
238 }
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"));
242}
243
244/****************************************************************************
245 Reply for the nt protocol.
246****************************************************************************/
247static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
248{
249 /* dual names + lock_and_read + nt SMBs + remote API calls */
250 int capabilities;
251 int secword=0;
252 time_t t = req->request_time.tv_sec;
253 NTTIME nttime;
254 bool negotiate_spnego = false;
255 char *large_test_path;
256
257 unix_to_nt_time(&nttime, t);
258
259 capabilities =
260 CAP_NT_FIND | CAP_LOCK_AND_READ |
261 CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
262
263 req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords(req->smb_conn->lp_ctx);
264
265 /* do spnego in user level security if the client
266 supports it and we can do encrypted passwords */
267
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;
274 }
275
276 if (lp_unix_extensions(req->smb_conn->lp_ctx)) {
277 capabilities |= CAP_UNIX;
278 }
279
280 if (lp_large_readwrite(req->smb_conn->lp_ctx)) {
281 capabilities |= CAP_LARGE_READX | CAP_LARGE_WRITEX | CAP_W2K_SMBS;
282 }
283
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;
287 }
288
289 if (lp_readraw(req->smb_conn->lp_ctx) &&
290 lp_writeraw(req->smb_conn->lp_ctx)) {
291 capabilities |= CAP_RAW_MODE;
292 }
293
294 /* allow for disabling unicode */
295 if (lp_unicode(req->smb_conn->lp_ctx)) {
296 capabilities |= CAP_UNICODE;
297 }
298
299 if (lp_nt_status_support(req->smb_conn->lp_ctx)) {
300 capabilities |= CAP_STATUS32;
301 }
302
303 if (lp_host_msdfs(req->smb_conn->lp_ctx)) {
304 capabilities |= CAP_DFS;
305 }
306
307 if (lp_security(req->smb_conn->lp_ctx) != SEC_SHARE) {
308 secword |= NEGOTIATE_SECURITY_USER_LEVEL;
309 }
310
311 if (req->smb_conn->negotiate.encrypted_passwords) {
312 secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
313 }
314
315 if (req->smb_conn->signing.allow_smb_signing) {
316 secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
317 }
318
319 if (req->smb_conn->signing.mandatory_signing) {
320 secword |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
321 }
322
323 req->smb_conn->negotiate.protocol = PROTOCOL_NT1;
324
325 smbsrv_setup_reply(req, 17, 0);
326
327 SSVAL(req->out.vwv, VWV(0), choice);
328 SCVAL(req->out.vwv, VWV(1), secword);
329
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);
342
343 if (!negotiate_spnego) {
344 reply_nt1_orig(req);
345 } else {
346 struct cli_credentials *server_credentials;
347 struct gensec_security *gensec_security;
348 DATA_BLOB null_data_blob = data_blob(NULL, 0);
349 DATA_BLOB blob;
350 const char *oid;
351 NTSTATUS nt_status;
352
353 server_credentials
354 = cli_credentials_init(req);
355 if (!server_credentials) {
356 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
357 return;
358 }
359
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;
366 }
367
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,
372 server_credentials,
373 "cifs",
374 &gensec_security);
375
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");
379 return;
380 }
381
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");
384 return;
385 }
386 req->smb_conn->negotiate.server_credentials = talloc_reparent(req, req->smb_conn, server_credentials);
387
388 gensec_set_target_service(gensec_security, "cifs");
389
390 gensec_set_credentials(gensec_security, server_credentials);
391
392 oid = GENSEC_OID_SPNEGO;
393 nt_status = gensec_start_mech_by_oid(gensec_security, oid);
394
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);
398
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)));
401 }
402 }
403
404 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
405 DEBUG(3,("using SPNEGO\n"));
406 } else {
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);
410
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)));
413 reply_nt1_orig(req);
414 return;
415 }
416 /* NTLMSSP is a client-first exchange */
417 blob = data_blob(NULL, 0);
418 DEBUG(3,("using raw-NTLMSSP\n"));
419 }
420
421 req->smb_conn->negotiate.oid = oid;
422
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);
427 req->out.ptr += 16;
428
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;
432 }
433
434 smbsrv_send_reply_nosign(req);
435}
436
437/****************************************************************************
438 Reply for the SMB2 2.001 protocol
439****************************************************************************/
440static void reply_smb2(struct smbsrv_request *req, uint16_t choice)
441{
442 struct smbsrv_connection *smb_conn = req->smb_conn;
443 NTSTATUS status;
444
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);
450
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));
455 talloc_free(req);
456 return;
457 }
458 packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
459 smb2srv_reply_smb_negprot(req);
460 req = NULL;
461}
462
463/* List of supported protocols, most desired first */
464static const struct {
465 const char *proto_name;
466 const char *short_name;
467 void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice);
468 int protocol_level;
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},
482 {NULL,NULL,NULL,0},
483};
484
485/****************************************************************************
486 Reply to a negprot.
487****************************************************************************/
488
489void smbsrv_reply_negprot(struct smbsrv_request *req)
490{
491 int protocol;
492 uint8_t *p;
493 uint32_t protos_count = 0;
494 char **protos = NULL;
495
496 if (req->smb_conn->negotiate.done_negprot) {
497 smbsrv_terminate_connection(req->smb_conn, "multiple negprot's are not permitted");
498 return;
499 }
500 req->smb_conn->negotiate.done_negprot = true;
501
502 p = req->in.data;
503 while (true) {
504 size_t len;
505
506 protos = talloc_realloc(req, protos, char *, protos_count + 1);
507 if (!protos) {
508 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
509 return;
510 }
511 protos[protos_count] = NULL;
512 len = req_pull_ascii4(&req->in.bufinfo, (const char **)&protos[protos_count], p, STR_ASCII|STR_TERMINATE);
513 p += len;
514 if (len == 0 || !protos[protos_count]) break;
515
516 DEBUG(5,("Requested protocol [%d][%s]\n", protos_count, protos[protos_count]));
517 protos_count++;
518 }
519
520 /* Check for protocols, most desirable first */
521 for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
522 int i;
523
524 if (supported_protocols[protocol].protocol_level > lp_srv_maxprotocol(req->smb_conn->lp_ctx))
525 continue;
526 if (supported_protocols[protocol].protocol_level < lp_srv_minprotocol(req->smb_conn->lp_ctx))
527 continue;
528
529 for (i = 0; i < protos_count; i++) {
530 if (strcmp(supported_protocols[protocol].proto_name, protos[i]) != 0) continue;
531
532 supported_protocols[protocol].proto_reply_fn(req, i);
533 DEBUG(3,("Selected protocol [%d][%s]\n",
534 i, supported_protocols[protocol].proto_name));
535 return;
536 }
537 }
538
539 smbsrv_terminate_connection(req->smb_conn, "No protocol supported !");
540}
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