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
|
/*
Unix SMB/CIFS implementation.
SMB Transport encryption (sealing) code.
Copyright (C) Jeremy Allison 2007.
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"
NTSTATUS cli_decrypt_message(struct cli_state *cli)
{
return NT_STATUS_OK;
}
NTSTATUS cli_encrypt_message(struct cli_state *cli)
{
return NT_STATUS_OK;
}
/* Server state if we're encrypting SMBs. If NULL then enc is off. */
static struct smb_trans_enc_state *srv_trans_enc_state;
/******************************************************************************
Is server encryption on ?
******************************************************************************/
BOOL srv_encryption_on(void)
{
return srv_trans_enc_state != NULL;
}
/******************************************************************************
Free an encryption-allocated buffer.
******************************************************************************/
void srv_free_buffer(char *buf_out)
{
if (!srv_trans_enc_state) {
return;
}
if (srv_trans_enc_state->smb_enc_type == SMB_TRANS_ENC_NTLM) {
SAFE_FREE(buf_out);
return;
}
#if defined(HAVE_GSSAPI_SUPPORT) && defined(HAVE_KRB5)
/* gss-api free buffer.... */
#endif
}
/******************************************************************************
gss-api decrypt an incoming buffer.
******************************************************************************/
#if defined(HAVE_GSSAPI_SUPPORT) && defined(HAVE_KRB5)
static NTSTATUS srv_gss_decrypt_buffer(gss_ctx_id_t context_handle, char *buf)
{
return NT_STATUS_NOT_SUPPORTED;
}
#endif
/******************************************************************************
NTLM decrypt an incoming buffer.
******************************************************************************/
static NTSTATUS srv_ntlm_decrypt_buffer(NTLMSSP_STATE *ntlmssp_state, char *buf)
{
NTSTATUS status;
size_t orig_len = smb_len(buf);
size_t new_len = orig_len - NTLMSSP_SIG_SIZE;
DATA_BLOB sig;
if (orig_len < 8 + NTLMSSP_SIG_SIZE) {
return NT_STATUS_BUFFER_TOO_SMALL;
}
/* Save off the signature. */
sig = data_blob(buf+orig_len-NTLMSSP_SIG_SIZE, NTLMSSP_SIG_SIZE);
status = ntlmssp_unseal_packet(ntlmssp_state,
(unsigned char *)buf + 8, /* 4 byte len + 0xFF 'S' 'M' 'B' */
new_len - 8,
(unsigned char *)buf,
new_len,
&sig);
if (!NT_STATUS_IS_OK(status)) {
data_blob_free(&sig);
return status;
}
/* Reset the length. */
smb_setlen(buf, new_len);
return NT_STATUS_OK;
}
/******************************************************************************
Decrypt an incoming buffer.
******************************************************************************/
NTSTATUS srv_decrypt_buffer(char *buf)
{
if (!srv_trans_enc_state) {
/* Not decrypting. */
return NT_STATUS_OK;
}
if (srv_trans_enc_state->smb_enc_type == SMB_TRANS_ENC_NTLM) {
return srv_ntlm_decrypt_buffer(srv_trans_enc_state->ntlmssp_state, buf);
} else {
#if defined(HAVE_GSSAPI_SUPPORT) && defined(HAVE_KRB5)
return srv_gss_decrypt_buffer(srv_trans_enc_state->context_handle, buf);
#else
return NT_STATUS_NOT_SUPPORTED;
#endif
}
}
/******************************************************************************
gss-api encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
******************************************************************************/
#if defined(HAVE_GSSAPI_SUPPORT) && defined(HAVE_KRB5)
static NTSTATUS srv_gss_encrypt_buffer(gss_ctx_id_t context_handle, char *buf, char **buf_out)
{
return NT_STATUS_NOT_SUPPORTED;
}
#endif
/******************************************************************************
NTLM encrypt an outgoing buffer. Return the encrypted pointer in ppbuf_out.
******************************************************************************/
static NTSTATUS srv_ntlm_encrypt_buffer(NTLMSSP_STATE *ntlmssp_state, char *buf, char **ppbuf_out)
{
NTSTATUS status;
char *buf_out;
size_t orig_len = smb_len(buf);
size_t new_len = orig_len + NTLMSSP_SIG_SIZE;
DATA_BLOB sig;
*ppbuf_out = NULL;
if (orig_len < 8) {
return NT_STATUS_BUFFER_TOO_SMALL;
}
/*
* We know smb_len can't return a value > 128k, so no int overflow
* check needed.
*/
/* Copy the original buffer. */
buf_out = SMB_XMALLOC_ARRAY(char, new_len);
memcpy(buf_out, buf, orig_len);
/* Last 16 bytes undefined here... */
smb_setlen(buf_out, new_len);
sig = data_blob(NULL, NTLMSSP_SIG_SIZE);
status = ntlmssp_seal_packet(ntlmssp_state,
(unsigned char *)buf_out + 8, /* 4 byte len + 0xFF 'S' 'M' 'B' */
orig_len - 8,
(unsigned char *)buf_out,
orig_len,
&sig);
if (!NT_STATUS_IS_OK(status)) {
data_blob_free(&sig);
SAFE_FREE(buf_out);
return status;
}
memcpy(buf_out+orig_len, sig.data, NTLMSSP_SIG_SIZE);
*ppbuf_out = buf_out;
return NT_STATUS_OK;
}
/******************************************************************************
Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
******************************************************************************/
NTSTATUS srv_encrypt_buffer(char *buffer, char **buf_out)
{
if (!srv_trans_enc_state) {
/* Not encrypting. */
*buf_out = buffer;
return NT_STATUS_OK;
}
if (srv_trans_enc_state->smb_enc_type == SMB_TRANS_ENC_NTLM) {
return srv_ntlm_encrypt_buffer(srv_trans_enc_state->ntlmssp_state, buffer, buf_out);
} else {
#if defined(HAVE_GSSAPI_SUPPORT) && defined(HAVE_KRB5)
return srv_gss_encrypt_buffer(srv_trans_enc_state->context_handle, buffer, buf_out);
#else
return NT_STATUS_NOT_SUPPORTED;
#endif
}
}
|
