summaryrefslogtreecommitdiff
path: root/source3/smbd/smb2_negprot.c
blob: b976ea239956fbf6849a7b74fcfa4bab80bbe131 (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
/*
   Unix SMB/CIFS implementation.
   Core SMB2 server

   Copyright (C) Stefan Metzmacher 2009

   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 "smbd/globals.h"
#include "../source4/libcli/smb2/smb2_constants.h"

extern enum protocol_types Protocol;

/*
 * this is the entry point if SMB2 is selected via
 * the SMB negprot
 */
void reply_smb2002(struct smb_request *req, uint16_t choice)
{
	uint8_t *smb2_inbuf;
	uint8_t *smb2_hdr;
	uint8_t *smb2_body;
	uint8_t *smb2_dyn;
	size_t len = 4 + SMB2_HDR_BODY + 0x24 + 2;

	smb2_inbuf = talloc_zero_array(talloc_tos(), uint8_t, len);
	if (smb2_inbuf == NULL) {
		DEBUG(0, ("Could not push spnego blob\n"));
		reply_nterror(req, NT_STATUS_NO_MEMORY);
		return;
	}
	smb2_hdr = smb2_inbuf + 4;
	smb2_body = smb2_hdr + SMB2_HDR_BODY;
	smb2_dyn = smb2_body + 0x24;

	SIVAL(smb2_hdr, SMB2_HDR_PROTOCOL_ID,	SMB2_MAGIC);
	SIVAL(smb2_hdr, SMB2_HDR_LENGTH,	SMB2_HDR_BODY);

	SSVAL(smb2_body, 0x00, 0x0024);	/* struct size */
	SSVAL(smb2_body, 0x02, 0x0001);	/* dialect count */

	SSVAL(smb2_dyn,  0x00, 0x0202);	/* dialect 2.002 */

	req->outbuf = NULL;

	smbd_smb2_first_negprot(smbd_server_conn, smb2_inbuf, len);
	return;
}

NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
{
	const uint8_t *inbody;
	const uint8_t *indyn = NULL;
	int i = req->current_idx;
	DATA_BLOB outbody;
	DATA_BLOB outdyn;
	DATA_BLOB negprot_spnego_blob;
	uint16_t security_offset;
	DATA_BLOB security_buffer;
	size_t expected_body_size = 0x24;
	size_t body_size;
	size_t expected_dyn_size = 0;
	size_t c;
	uint16_t dialect_count;
	uint16_t dialect;

/* TODO: drop the connection with INVALI_PARAMETER */

	if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	inbody = (const uint8_t *)req->in.vector[i+1].iov_base;

	body_size = SVAL(inbody, 0x00);
	if (body_size != expected_body_size) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	dialect_count = SVAL(inbody, 0x02);
	if (dialect_count == 0) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	expected_dyn_size = dialect_count * 2;
	if (req->in.vector[i+2].iov_len < expected_dyn_size) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}
	indyn = (const uint8_t *)req->in.vector[i+2].iov_base;

	for (c=0; c < dialect_count; c++) {
		dialect = SVAL(indyn, c*2);
		if (dialect == 0x0202) {
			break;
		}
	}

	if (dialect != 0x0202) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	Protocol = PROTOCOL_SMB2;

	if (get_remote_arch() != RA_SAMBA) {
		set_remote_arch(RA_VISTA);
	}

	/* negprot_spnego() returns a the server guid in the first 16 bytes */
	negprot_spnego_blob = negprot_spnego();
	if (negprot_spnego_blob.data == NULL) {
		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
	}
	talloc_steal(req, negprot_spnego_blob.data);

	if (negprot_spnego_blob.length < 16) {
		return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
	}

	security_offset = SMB2_HDR_BODY + 0x40;
	security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
					  negprot_spnego_blob.length - 16);

	/* for now we want raw NTLMSSP */
	security_buffer = data_blob_const(NULL, 0);

	outbody = data_blob_talloc(req->out.vector, NULL, 0x40);
	if (outbody.data == NULL) {
		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
	}

	SSVAL(outbody.data, 0x00, 0x40 + 1);	/* struct size */
/*TODO: indicate signing enabled */
	SSVAL(outbody.data, 0x02, 0);		/* security mode */
	SSVAL(outbody.data, 0x04, dialect);	/* dialect revision */
	SSVAL(outbody.data, 0x06, 0);		/* reserved */
	memcpy(outbody.data + 0x08,
	       negprot_spnego_blob.data, 16);	/* server guid */
	SIVAL(outbody.data, 0x18, 0);		/* capabilities */
	SIVAL(outbody.data, 0x1C, 0x00010000);	/* max transact size */
	SIVAL(outbody.data, 0x20, 0x00010000);	/* max read size */
	SIVAL(outbody.data, 0x24, 0x00010000);	/* max write size */
	SBVAL(outbody.data, 0x28, 0);		/* system time */
	SBVAL(outbody.data, 0x30, 0);		/* server start time */
	SSVAL(outbody.data, 0x38,
	      security_offset);			/* security buffer offset */
	SSVAL(outbody.data, 0x3A,
	      security_buffer.length);		/* security buffer length */
	SIVAL(outbody.data, 0x3C, 0);		/* reserved */

	outdyn = security_buffer;

	return smbd_smb2_request_done(req, outbody, &outdyn);
}