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
|
/*
Unix SMB/Netbios implementation.
Version 1.9.
code to manipulate domain credentials
Copyright (C) Andrew Tridgell 1997
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"
/****************************************************************************
setup the session key.
Input: 8 byte challenge block
8 byte server challenge block
16 byte md4 encrypted password
Output:
8 byte session key
****************************************************************************/
void cred_session_key(char *challenge, char *srv_challenge, char *pass,
char *session_key)
{
uint32 sum[2];
char sum2[8];
char buf[8];
sum[0] = IVAL(challenge, 0) + IVAL(srv_challenge, 0);
sum[1] = IVAL(challenge, 4) + IVAL(srv_challenge, 4);
SIVAL(sum2,0,sum[0]);
SIVAL(sum2,4,sum[1]);
E1(pass,sum2,buf);
E1(pass+9,buf,session_key);
}
/****************************************************************************
create a credential
Input:
8 byte sesssion key
8 byte stored credential
4 byte timestamp
Output:
8 byte credential
****************************************************************************/
void cred_create(char *session_key, char *stored_cred, UTIME timestamp,
char *cred)
{
char key2[7];
char buf[8];
char timecred[8];
memcpy(timecred, stored_cred, 8);
SIVAL(timecred, 0, IVAL(stored_cred, 0) + timestamp.time);
E1(session_key, timecred, buf);
memset(key2, 0, 7);
key2[0] = session_key[7];
E1(key2, buf, cred);
}
/****************************************************************************
check a supplied credential
Input:
8 byte received credential
8 byte sesssion key
8 byte stored credential
4 byte timestamp
Output:
returns 1 if computed credential matches received credential
returns 0 otherwise
****************************************************************************/
int cred_assert(char *cred, char *session_key, char *stored_cred,
NTTIME timestamp)
{
char cred2[8];
cred_create(session_key, stored_cred, timestamp, cred2);
return memcmp(cred, cred2, 8) == 0;
}
|
