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
|
/*
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"
extern int DEBUGLEVEL;
/****************************************************************************
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(DOM_CHAL *clnt_chal, DOM_CHAL *srv_chal, char *pass,
uint32 session_key[2])
{
uint32 sum[2];
char sum2[8];
char buf[8];
char netsesskey[8];
sum[0] = IVAL(clnt_chal->data, 0) + IVAL(srv_chal->data, 0);
sum[1] = IVAL(clnt_chal->data, 4) + IVAL(srv_chal->data, 4);
SIVAL(sum2,0,sum[0]);
SIVAL(sum2,4,sum[1]);
smbhash(buf, sum2, pass);
smbhash(netsesskey, buf, pass+9);
session_key[0] = IVAL(netsesskey, 0);
session_key[1] = IVAL(netsesskey, 4);
/* debug output */
DEBUG(4,("cred_session_key\n"));
DEBUG(5,(" clnt_chal: %lx %lx\n", clnt_chal->data[0], clnt_chal->data[1]));
DEBUG(5,(" srv_chal : %lx %lx\n", srv_chal ->data[0], srv_chal ->data[1]));
DEBUG(5,(" clnt+srv : %lx %lx\n", sum [0], sum [1]));
DEBUG(5,(" sess_key : %lx %lx\n", session_key [0], session_key [1]));
}
/****************************************************************************
create a credential
Input:
8 byte sesssion key
8 byte stored credential
4 byte timestamp
Output:
8 byte credential
****************************************************************************/
void cred_create(uint32 session_key[2], DOM_CHAL *stor_cred, UTIME timestamp,
DOM_CHAL *cred)
{
char key2[7];
char buf[8];
char calc_cred[8];
char timecred[8];
char netsesskey[8];
SIVAL(netsesskey, 0, session_key[0]);
SIVAL(netsesskey, 4, session_key[1]);
SIVAL(timecred, 0, IVAL(stor_cred, 0) + timestamp.time);
SIVAL(timecred, 4, IVAL(stor_cred, 4));
smbhash(buf, timecred, netsesskey);
memset(key2, 0, 7);
key2[0] = netsesskey[7];
smbhash(calc_cred, buf, key2);
cred->data[0] = IVAL(calc_cred, 0);
cred->data[1] = IVAL(calc_cred, 4);
/* debug output*/
DEBUG(4,("cred_create\n"));
DEBUG(5,(" sess_key : %lx %lx\n", session_key [0], session_key [1]));
DEBUG(5,(" stor_cred: %lx %lx\n", stor_cred->data[0], stor_cred->data[1]));
DEBUG(5,(" timecred : %lx %lx\n", IVAL(timecred, 0) , IVAL(timecred, 4) ));
DEBUG(5,(" calc_cred: %lx %lx\n", cred ->data[0], cred ->data[1]));
}
/****************************************************************************
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(DOM_CHAL *cred, uint32 session_key[2], DOM_CHAL *stored_cred,
UTIME timestamp)
{
DOM_CHAL cred2;
cred_create(session_key, stored_cred, timestamp, &cred2);
/* debug output*/
DEBUG(4,("cred_assert\n"));
DEBUG(5,(" challenge : %lx %lx\n", cred->data[0], cred->data[1]));
DEBUG(5,(" calculated: %lx %lx\n", cred2.data[0], cred2.data[1]));
if (memcmp(cred->data, cred2.data, 8) == 0)
{
DEBUG(5, ("credentials check ok\n"));
return True;
}
else
{
DEBUG(5, ("credentials check wrong\n"));
return False;
}
}
|
