summaryrefslogtreecommitdiff
path: root/source3/libsmb/clidgram.c
blob: 05a0edc59dee8b50d73099201724ed2db5407245 (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
/* 
   Unix SMB/CIFS implementation.
   client dgram calls
   Copyright (C) Andrew Tridgell 1994-1998
   Copyright (C) Richard Sharpe 2001
   Copyright (C) John Terpstra 2001

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "librpc/gen_ndr/messaging.h"
#include "libsmb/clidgram.h"

/*
 * cli_send_mailslot, send a mailslot for client code ...
 */

static bool cli_prep_mailslot(bool unique, const char *mailslot,
		       uint16 priority,
		       char *buf, int len,
		       const char *srcname, int src_type,
		       const char *dstname, int dest_type,
		       const struct sockaddr_storage *dest_ss,
		       int dgm_id,
		       struct packet_struct *p)
{
	struct dgram_packet *dgram = &p->packet.dgram;
	char *ptr, *p2;
	char tmp[4];
	char addr[INET6_ADDRSTRLEN];

	ZERO_STRUCTP(p);

	/*
	 * Next, build the DGRAM ...
	 */

	/* DIRECT GROUP or UNIQUE datagram. */
	dgram->header.msg_type = unique ? 0x10 : 0x11;
	dgram->header.flags.node_type = M_NODE;
	dgram->header.flags.first = True;
	dgram->header.flags.more = False;
	dgram->header.dgm_id = dgm_id;
	/* source ip is filled by nmbd */
	dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
	dgram->header.packet_offset = 0;

	make_nmb_name(&dgram->source_name,srcname,src_type);
	make_nmb_name(&dgram->dest_name,dstname,dest_type);

	ptr = &dgram->data[0];

	/* Setup the smb part. */
	ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
	memcpy(tmp,ptr,4);

	if (smb_size + 17*2 + strlen(mailslot) + 1 + len > MAX_DGRAM_SIZE) {
		DEBUG(0, ("cli_send_mailslot: Cannot write beyond end of packet\n"));
		return False;
	}

	cli_set_message(ptr,17,strlen(mailslot) + 1 + len,True);
	memcpy(ptr,tmp,4);

	SCVAL(ptr,smb_com,SMBtrans);
	SSVAL(ptr,smb_vwv1,len);
	SSVAL(ptr,smb_vwv11,len);
	SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
	SSVAL(ptr,smb_vwv13,3);
	SSVAL(ptr,smb_vwv14,1);
	SSVAL(ptr,smb_vwv15,priority);
	SSVAL(ptr,smb_vwv16,2);
	p2 = smb_buf(ptr);
	fstrcpy(p2,mailslot);
	p2 = skip_string(ptr,MAX_DGRAM_SIZE,p2);
	if (!p2) {
		return False;
	}

	memcpy(p2,buf,len);
	p2 += len;

	dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */

	p->packet_type = DGRAM_PACKET;
	p->ip = ((const struct sockaddr_in *)dest_ss)->sin_addr;
	p->timestamp = time(NULL);

	DEBUG(4,("send_mailslot: Sending to mailslot %s from %s ",
		 mailslot, nmb_namestr(&dgram->source_name)));
	print_sockaddr(addr, sizeof(addr), dest_ss);

	DEBUGADD(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), addr));

	return true;
}

static const char *mailslot_name(TALLOC_CTX *mem_ctx, struct in_addr dc_ip)
{
	return talloc_asprintf(mem_ctx, "%s%X",
			       NBT_MAILSLOT_GETDC, dc_ip.s_addr);
}

static bool prep_getdc_request(const struct sockaddr_storage *dc_ss,
			       const char *domain_name,
			       const struct dom_sid *sid,
			       uint32_t nt_version,
			       int dgm_id,
			       struct packet_struct *p)
{
	TALLOC_CTX *frame = talloc_stackframe();
	struct in_addr dc_ip;
	const char *my_acct_name;
	const char *my_mailslot;
	struct nbt_netlogon_packet packet;
	struct NETLOGON_SAM_LOGON_REQUEST *s;
	enum ndr_err_code ndr_err;
	DATA_BLOB blob = data_blob_null;
	struct dom_sid my_sid;
	bool ret = false;

	if (dc_ss->ss_family != AF_INET) {
		goto fail;
	}

	ZERO_STRUCT(packet);
	ZERO_STRUCT(my_sid);

	if (sid != NULL) {
		my_sid = *sid;
	}

	dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;

	my_mailslot = mailslot_name(talloc_tos(), dc_ip);
	if (my_mailslot == NULL) {
		goto fail;
	}

	my_acct_name = talloc_asprintf(talloc_tos(), "%s$", global_myname());
	if (my_acct_name == NULL) {
		goto fail;
	}

	packet.command	= LOGON_SAM_LOGON_REQUEST;
	s		= &packet.req.logon;

	s->request_count	= 0;
	s->computer_name	= global_myname();
	s->user_name		= my_acct_name;
	s->mailslot_name	= my_mailslot;
	s->acct_control		= ACB_WSTRUST;
	s->sid			= my_sid;
	s->nt_version		= nt_version;
	s->lmnt_token		= 0xffff;
	s->lm20_token		= 0xffff;

	if (DEBUGLEVEL >= 10) {
		NDR_PRINT_DEBUG(nbt_netlogon_packet, &packet);
	}

	ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &packet,
		       (ndr_push_flags_fn_t)ndr_push_nbt_netlogon_packet);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		goto fail;
	}

	ret = cli_prep_mailslot(false, NBT_MAILSLOT_NTLOGON, 0,
				(char *)blob.data, blob.length,
				global_myname(), 0, domain_name, 0x1c,
				dc_ss, dgm_id, p);
fail:
	TALLOC_FREE(frame);
	return ret;
}

bool send_getdc_request(struct messaging_context *msg_ctx,
			const struct sockaddr_storage *dc_ss,
			const char *domain_name,
			const struct dom_sid *sid,
			uint32_t nt_version,
			int dgm_id)
{
	struct packet_struct p;
	pid_t nmbd_pid;

	if ((nmbd_pid = pidfile_pid("nmbd")) == 0) {
		DEBUG(3, ("No nmbd found\n"));
		return False;
	}

	if (!prep_getdc_request(dc_ss, domain_name, sid, nt_version,
				dgm_id, &p)) {
		return false;
	}

	return NT_STATUS_IS_OK(messaging_send_buf(msg_ctx,
						  pid_to_procid(nmbd_pid),
						  MSG_SEND_PACKET,
						  (uint8 *)&p, sizeof(p)));
}

bool receive_getdc_response(TALLOC_CTX *mem_ctx,
			    const struct sockaddr_storage *dc_ss,
			    const char *domain_name,
			    int dgm_id,
			    uint32_t *nt_version,
			    const char **dc_name,
			    struct netlogon_samlogon_response **samlogon_response)
{
	struct packet_struct *packet;
	const char *my_mailslot = NULL;
	struct in_addr dc_ip;
	DATA_BLOB blob;
	struct netlogon_samlogon_response *r;
	union dgram_message_body p;
	enum ndr_err_code ndr_err;
	NTSTATUS status;

	const char *returned_dc = NULL;
	const char *returned_domain = NULL;

	if (dc_ss->ss_family != AF_INET) {
		return false;
	}

	dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;

	my_mailslot = mailslot_name(mem_ctx, dc_ip);
	if (!my_mailslot) {
		return false;
	}

	packet = receive_unexpected(DGRAM_PACKET, dgm_id, my_mailslot);

	if (packet == NULL) {
		DEBUG(5, ("Did not receive packet for %s\n", my_mailslot));
		return False;
	}

	DEBUG(5, ("Received packet for %s\n", my_mailslot));

	blob = data_blob_const(packet->packet.dgram.data,
			       packet->packet.dgram.datasize);

	if (blob.length < 4) {
		DEBUG(0,("invalid length: %d\n", (int)blob.length));
		return false;
	}

	if (RIVAL(blob.data,0) != DGRAM_SMB) {
		DEBUG(0,("invalid packet\n"));
		return false;
	}

	blob.data += 4;
	blob.length -= 4;

	ndr_err = ndr_pull_union_blob_all(&blob, mem_ctx, &p, DGRAM_SMB,
		       (ndr_pull_flags_fn_t)ndr_pull_dgram_smb_packet);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		DEBUG(0,("failed to parse packet\n"));
		return false;
	}

	if (p.smb.smb_command != SMB_TRANSACTION) {
		DEBUG(0,("invalid smb_command: %d\n", p.smb.smb_command));
		return false;
	}

	if (DEBUGLEVEL >= 10) {
		NDR_PRINT_DEBUG(dgram_smb_packet, &p);
	}

	blob = p.smb.body.trans.data;

	r = TALLOC_ZERO_P(mem_ctx, struct netlogon_samlogon_response);
	if (!r) {
		return false;
	}

	status = pull_netlogon_samlogon_response(&blob, mem_ctx, r);
	if (!NT_STATUS_IS_OK(status)) {
		TALLOC_FREE(r);
		return false;
	}

	map_netlogon_samlogon_response(r);

	/* do we still need this ? */
	*nt_version = r->ntver;

	returned_domain = r->data.nt5_ex.domain_name;
	returned_dc = r->data.nt5_ex.pdc_name;

	if (!strequal(returned_domain, domain_name)) {
		DEBUG(3, ("GetDC: Expected domain %s, got %s\n",
			  domain_name, returned_domain));
		TALLOC_FREE(r);
		return false;
	}

	*dc_name = talloc_strdup(mem_ctx, returned_dc);
	if (!*dc_name) {
		TALLOC_FREE(r);
		return false;
	}

	if (**dc_name == '\\')	*dc_name += 1;
	if (**dc_name == '\\')	*dc_name += 1;

	if (samlogon_response) {
		*samlogon_response = r;
	} else {
		TALLOC_FREE(r);
	}

	DEBUG(10, ("GetDC gave name %s for domain %s\n",
		   *dc_name, returned_domain));

	return True;
}