summaryrefslogtreecommitdiff
path: root/source4/smb_server/negprot.c
blob: aa809664a124065ee540dc790f9ee4331bf4a750 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
/* 
   Unix SMB/CIFS implementation.
   negprot reply code
   Copyright (C) Andrew Tridgell 1992-1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "auth/auth.h"

/* initialise the auth_context for this server and return the cryptkey */
static void get_challenge(struct smbsrv_connection *smb_conn, char buff[8]) 
{
	NTSTATUS nt_status;
	const uint8_t *cryptkey;

	/* muliple negprots are not premitted */
	if (smb_conn->negotiate.auth_context) {
		DEBUG(3,("get challenge: is this a secondary negprot?  auth_context is non-NULL!\n"));
		smb_panic("secondary negprot");
	}

	DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));

	nt_status = make_auth_context_subsystem(smb_conn, &smb_conn->negotiate.auth_context);

	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(0, ("make_auth_context_subsystem returned %s", nt_errstr(nt_status)));
		smb_panic("cannot make_negprot_global_auth_context!\n");
	}

	DEBUG(10, ("get challenge: getting challenge\n"));
	cryptkey = smb_conn->negotiate.auth_context->get_ntlm_challenge(smb_conn->negotiate.auth_context);
	memcpy(buff, cryptkey, 8);
}

/****************************************************************************
 Reply for the core protocol.
****************************************************************************/
static void reply_corep(struct smbsrv_request *req, uint16_t choice)
{
	req_setup_reply(req, 1, 0);

	SSVAL(req->out.vwv, VWV(0), choice);

	req->smb_conn->negotiate.protocol = PROTOCOL_CORE;

	if (req->smb_conn->signing.mandatory_signing) {
		smbsrv_terminate_connection(req->smb_conn, 
					    "CORE does not support SMB signing, and it is mandetory\n");
	}

	req_send_reply(req);
}

/****************************************************************************
 Reply for the coreplus protocol.
this is quite incomplete - we only fill in a small part of the reply, but as nobody uses
this any more it probably doesn't matter
****************************************************************************/
static void reply_coreplus(struct smbsrv_request *req, uint16_t choice)
{
	uint16_t raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);

	req_setup_reply(req, 13, 0);

	/* Reply, SMBlockread, SMBwritelock supported. */
	SCVAL(req->out.hdr,HDR_FLG,
	      CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);

	SSVAL(req->out.vwv, VWV(0), choice);
	SSVAL(req->out.vwv, VWV(1), 0x1); /* user level security, don't encrypt */	

	/* tell redirector we support
	   readbraw and writebraw (possibly) */
	SSVAL(req->out.vwv, VWV(5), raw); 

	req->smb_conn->negotiate.protocol = PROTOCOL_COREPLUS;

	if (req->smb_conn->signing.mandatory_signing) {
		smbsrv_terminate_connection(req->smb_conn, 
					    "COREPLUS does not support SMB signing, and it is mandetory\n");
	}

	req_send_reply(req);
}

/****************************************************************************
 Reply for the lanman 1.0 protocol.
****************************************************************************/
static void reply_lanman1(struct smbsrv_request *req, uint16_t choice)
{
	int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
	int secword=0;
	time_t t = req->request_time.tv_sec;

	req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords();

	if (lp_security() != SEC_SHARE)
		secword |= NEGOTIATE_SECURITY_USER_LEVEL;

	if (req->smb_conn->negotiate.encrypted_passwords)
		secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;

	req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN1;

	req_setup_reply(req, 13, req->smb_conn->negotiate.encrypted_passwords ? 8 : 0);

	/* SMBlockread, SMBwritelock supported. */
	SCVAL(req->out.hdr,HDR_FLG,
	      CVAL(req->out.hdr, HDR_FLG) | FLAG_SUPPORT_LOCKREAD);

	SSVAL(req->out.vwv, VWV(0), choice);
	SSVAL(req->out.vwv, VWV(1), secword); 
	SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
	SSVAL(req->out.vwv, VWV(3), lp_maxmux());
	SSVAL(req->out.vwv, VWV(4), 1);
	SSVAL(req->out.vwv, VWV(5), raw); 
	SIVAL(req->out.vwv, VWV(6), req->smb_conn->pid);
	srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
	SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);
	SIVAL(req->out.vwv, VWV(11), 0); /* reserved */

	/* Create a token value and add it to the outgoing packet. */
	if (req->smb_conn->negotiate.encrypted_passwords) {
		SSVAL(req->out.vwv, VWV(11), 8);
		get_challenge(req->smb_conn, req->out.data);
	}

	if (req->smb_conn->signing.mandatory_signing) {
		smbsrv_terminate_connection(req->smb_conn, 
					    "LANMAN1 does not support SMB signing, and it is mandetory\n");
	}

	req_send_reply(req);	
}

/****************************************************************************
 Reply for the lanman 2.0 protocol.
****************************************************************************/
static void reply_lanman2(struct smbsrv_request *req, uint16_t choice)
{
	int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
	int secword=0;
	time_t t = req->request_time.tv_sec;

	req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords();
  
	if (lp_security() != SEC_SHARE)
		secword |= NEGOTIATE_SECURITY_USER_LEVEL;

	if (req->smb_conn->negotiate.encrypted_passwords)
		secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;

	req->smb_conn->negotiate.protocol = PROTOCOL_LANMAN2;

	req_setup_reply(req, 13, 0);

	SSVAL(req->out.vwv, VWV(0), choice);
	SSVAL(req->out.vwv, VWV(1), secword); 
	SSVAL(req->out.vwv, VWV(2), req->smb_conn->negotiate.max_recv);
	SSVAL(req->out.vwv, VWV(3), lp_maxmux());
	SSVAL(req->out.vwv, VWV(4), 1);
	SSVAL(req->out.vwv, VWV(5), raw); 
	SIVAL(req->out.vwv, VWV(6), req->smb_conn->pid);
	srv_push_dos_date(req->smb_conn, req->out.vwv, VWV(8), t);
	SSVAL(req->out.vwv, VWV(10), req->smb_conn->negotiate.zone_offset/60);

	/* Create a token value and add it to the outgoing packet. */
	if (req->smb_conn->negotiate.encrypted_passwords) {
		SSVAL(req->out.vwv, VWV(11), 8);
		req_grow_data(req, 8);
		get_challenge(req->smb_conn, req->out.data);
	}

	req_push_str(req, NULL, lp_workgroup(), -1, STR_TERMINATE);

	if (req->smb_conn->signing.mandatory_signing) {
		smbsrv_terminate_connection(req->smb_conn, 
					    "LANMAN2 does not support SMB signing, and it is mandetory\n");
	}

	req_send_reply(req);
}

/****************************************************************************
 Reply for the nt protocol.
****************************************************************************/
static void reply_nt1(struct smbsrv_request *req, uint16_t choice)
{
	/* dual names + lock_and_read + nt SMBs + remote API calls */
	int capabilities;
	int secword=0;
	time_t t = req->request_time.tv_sec;
	NTTIME nttime;
	BOOL negotiate_spnego = False;

	unix_to_nt_time(&nttime, t);

	capabilities = 
		CAP_NT_FIND | CAP_LOCK_AND_READ | 
		CAP_LEVEL_II_OPLOCKS | CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;

	req->smb_conn->negotiate.encrypted_passwords = lp_encrypted_passwords();

	/* do spnego in user level security if the client
	   supports it and we can do encrypted passwords */
	
	if (req->smb_conn->negotiate.encrypted_passwords && 
	    (lp_security() != SEC_SHARE) &&
	    lp_use_spnego() &&
	    (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
		negotiate_spnego = True; 
		capabilities |= CAP_EXTENDED_SECURITY;
	}
	
	if (lp_unix_extensions()) {
		capabilities |= CAP_UNIX;
	}
	
	if (lp_large_readwrite()) {
		capabilities |= CAP_LARGE_READX | CAP_LARGE_WRITEX | CAP_W2K_SMBS;
	}
	
	capabilities |= CAP_LARGE_FILES;

	if (lp_readraw() && lp_writeraw()) {
		capabilities |= CAP_RAW_MODE;
	}
	
	/* allow for disabling unicode */
	if (lp_unicode()) {
		capabilities |= CAP_UNICODE;
	}

	if (lp_nt_status_support()) {
		capabilities |= CAP_STATUS32;
	}
	
	if (lp_host_msdfs()) {
		capabilities |= CAP_DFS;
	}
	
	if (lp_security() != SEC_SHARE) {
		secword |= NEGOTIATE_SECURITY_USER_LEVEL;
	}

	if (req->smb_conn->negotiate.encrypted_passwords) {
		secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
	}

	if (req->smb_conn->signing.allow_smb_signing) {
		secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
	}

	if (req->smb_conn->signing.mandatory_signing) {
		secword |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
	}
	
	req->smb_conn->negotiate.protocol = PROTOCOL_NT1;

	req_setup_reply(req, 17, 0);
	
	SSVAL(req->out.vwv, VWV(0), choice);
	SCVAL(req->out.vwv, VWV(1), secword);

	/* notice the strange +1 on vwv here? That's because
	   this is the one and only SMB packet that is malformed in
	   the specification - all the command words after the secword
	   are offset by 1 byte */
	SSVAL(req->out.vwv+1, VWV(1), lp_maxmux());
	SSVAL(req->out.vwv+1, VWV(2), 1); /* num vcs */
	SIVAL(req->out.vwv+1, VWV(3), req->smb_conn->negotiate.max_recv);
	SIVAL(req->out.vwv+1, VWV(5), 0x10000); /* raw size. full 64k */
	SIVAL(req->out.vwv+1, VWV(7), req->smb_conn->pid); /* session key */
	SIVAL(req->out.vwv+1, VWV(9), capabilities);
	push_nttime(req->out.vwv+1, VWV(11), nttime);
	SSVALS(req->out.vwv+1,VWV(15), req->smb_conn->negotiate.zone_offset/60);
	
	if (!negotiate_spnego) {
		/* Create a token value and add it to the outgoing packet. */
		if (req->smb_conn->negotiate.encrypted_passwords) {
			req_grow_data(req, 8);
			/* note that we do not send a challenge at all if
			   we are using plaintext */
			get_challenge(req->smb_conn, req->out.ptr);
			req->out.ptr += 8;
			SCVAL(req->out.vwv+1, VWV(16), 8);
		}
		req_push_str(req, NULL, lp_workgroup(), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
		req_push_str(req, NULL, lp_netbios_name(), -1, STR_UNICODE|STR_TERMINATE|STR_NOALIGN);
		DEBUG(3,("not using SPNEGO\n"));
	} else {
		struct gensec_security *gensec_security;
		DATA_BLOB null_data_blob = data_blob(NULL, 0);
		DATA_BLOB blob;
		NTSTATUS nt_status = gensec_server_start(req->smb_conn, &gensec_security);
		
		if (req->smb_conn->negotiate.auth_context) {
			smbsrv_terminate_connection(req->smb_conn, "reply_nt1: is this a secondary negprot?  auth_context is non-NULL!\n");
			return;
		}

		req->smb_conn->negotiate.auth_context = NULL;
		
		if (!NT_STATUS_IS_OK(nt_status)) {
			DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
			smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
			return;
		}

		nt_status = gensec_start_mech_by_oid(gensec_security, OID_SPNEGO);
		
		if (!NT_STATUS_IS_OK(nt_status)) {
			DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
			smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
			return;
		}

		nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);

		if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
			DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
			smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
			return;
		}

		req->smb_conn->negotiate.spnego_negotiated = True;
	
		req_grow_data(req, blob.length + 16);
		/* a NOT very random guid */
		memset(req->out.ptr, '\0', 16);
		req->out.ptr += 16;

		memcpy(req->out.ptr, blob.data, blob.length);
		SCVAL(req->out.vwv+1, VWV(16), blob.length + 16);
		req->out.ptr += blob.length;
		DEBUG(3,("using SPNEGO\n"));
	}
	
	req_send_reply_nosign(req);	
}

 
/* List of supported protocols, most desired first */
static const struct {
	const char *proto_name;
	const char *short_name;
	void (*proto_reply_fn)(struct smbsrv_request *req, uint16_t choice);
	int protocol_level;
} supported_protocols[] = {
	{"NT LANMAN 1.0",           "NT1",      reply_nt1,      PROTOCOL_NT1},
	{"NT LM 0.12",              "NT1",      reply_nt1,      PROTOCOL_NT1},
	{"LM1.2X002",               "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
	{"Samba",                   "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
	{"DOS LM1.2X002",           "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
	{"LANMAN1.0",               "LANMAN1",  reply_lanman1,  PROTOCOL_LANMAN1},
	{"MICROSOFT NETWORKS 3.0",  "LANMAN1",  reply_lanman1,  PROTOCOL_LANMAN1},
	{"MICROSOFT NETWORKS 1.03", "COREPLUS", reply_coreplus, PROTOCOL_COREPLUS},
	{"PC NETWORK PROGRAM 1.0",  "CORE",     reply_corep,    PROTOCOL_CORE}, 
	{NULL,NULL,NULL,0},
};

/****************************************************************************
 Reply to a negprot.
****************************************************************************/

void reply_negprot(struct smbsrv_request *req)
{
	int Index=0;
	int choice = -1;
	int protocol;
	char *p;

	if (req->smb_conn->negotiate.done_negprot) {
		smbsrv_terminate_connection(req->smb_conn, "multiple negprot's are not permitted");
		return;
	}
	req->smb_conn->negotiate.done_negprot = True;

	p = req->in.data + 1;

	while (p < req->in.data + req->in.data_size) { 
		Index++;
		DEBUG(3,("Requested protocol [%s]\n",p));
		p += strlen(p) + 2;
	}
    
	/* Check for protocols, most desirable first */
	for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
		p = req->in.data+1;
		Index = 0;
		if ((supported_protocols[protocol].protocol_level <= lp_maxprotocol()) &&
				(supported_protocols[protocol].protocol_level >= lp_minprotocol()))
			while (p < (req->in.data + req->in.data_size)) { 
				if (strequal(p,supported_protocols[protocol].proto_name))
					choice = Index;
				Index++;
				p += strlen(p) + 2;
			}
		if(choice != -1)
			break;
	}
  
	if(choice != -1) {
		sub_set_remote_proto(supported_protocols[protocol].short_name);
		reload_services(req->smb_conn, True);
		supported_protocols[protocol].proto_reply_fn(req, choice);
		DEBUG(3,("Selected protocol %s\n",supported_protocols[protocol].proto_name));
	} else {
		DEBUG(0,("No protocol supported !\n"));
	}
  
	DEBUG(5,("negprot index=%d\n", choice));
}