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
|
/* $XConsortium: genauth.c,v 1.21 94/11/21 18:33:11 kaleb Exp kaleb $ */
/*
Copyright (c) 1988 X Consortium
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of the X Consortium shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the X Consortium.
*/
/*
* xdm - display manager daemon
* Author: Keith Packard, MIT X Consortium
*/
# include <X11/Xauth.h>
# include <X11/Xos.h>
# include "dm.h"
#include <errno.h>
#ifdef X_NOT_STDC_ENV
#define Time_t long
extern Time_t time ();
extern int errno;
#else
#include <time.h>
#define Time_t time_t
#endif
static unsigned char key[8];
#ifdef HASXDMAUTH
typedef unsigned char auth_cblock[8]; /* block size */
typedef struct auth_ks_struct { auth_cblock _; } auth_wrapper_schedule[16];
extern void _XdmcpWrapperToOddParity();
static
longtochars (l, c)
long l;
unsigned char *c;
{
c[0] = (l >> 24) & 0xff;
c[1] = (l >> 16) & 0xff;
c[2] = (l >> 8) & 0xff;
c[3] = l & 0xff;
}
# define FILE_LIMIT 1024 /* no more than this many buffers */
static
sumFile (name, sum)
char *name;
long sum[2];
{
long buf[1024*2];
int cnt;
int fd;
int loops;
int reads;
int i;
int ret_status = 0;
fd = open (name, 0);
if (fd < 0) {
LogError("Cannot open randomFile \"%s\", errno = %d\n", name, errno);
return 0;
}
#ifdef FRAGILE_DEV_MEM
if (strcmp(name, "/dev/mem") == 0) lseek (fd, (off_t) 0x100000, SEEK_SET);
#endif
reads = FILE_LIMIT;
sum[0] = 0;
sum[1] = 0;
while ((cnt = read (fd, (char *) buf, sizeof (buf))) > 0 && --reads > 0) {
loops = cnt / (2 * sizeof (long));
for (i = 0; i < loops; i+= 2) {
sum[0] += buf[i];
sum[1] += buf[i+1];
ret_status = 1;
}
}
if (cnt < 0)
LogError("Cannot read randomFile \"%s\", errno = %d\n", name, errno);
close (fd);
return ret_status;
}
static
InitXdmcpWrapper ()
{
long sum[2];
unsigned char tmpkey[8];
if (!sumFile (randomFile, sum)) {
sum[0] = time ((Time_t *) 0);
sum[1] = time ((Time_t *) 0);
}
longtochars (sum[0], tmpkey+0);
longtochars (sum[1], tmpkey+4);
tmpkey[0] = 0;
_XdmcpWrapperToOddParity (tmpkey, key);
}
#endif
GenerateAuthData (auth, len)
char *auth;
int len;
{
long ldata[2];
#ifdef ITIMER_REAL
{
struct timeval now;
X_GETTIMEOFDAY (&now);
ldata[0] = now.tv_sec;
ldata[1] = now.tv_usec;
}
#else
{
long time ();
ldata[0] = time ((long *) 0);
ldata[1] = getpid ();
}
#endif
#ifdef HASXDMAUTH
{
int bit;
int i;
auth_wrapper_schedule schedule;
unsigned char data[8];
static int xdmcpAuthInited;
longtochars (ldata[0], data+0);
longtochars (ldata[1], data+4);
if (!xdmcpAuthInited)
{
InitXdmcpWrapper ();
xdmcpAuthInited = 1;
}
_XdmcpAuthSetup (key, schedule);
for (i = 0; i < len; i++) {
auth[i] = 0;
for (bit = 1; bit < 256; bit <<= 1) {
_XdmcpAuthDoIt (data, data, schedule, 1);
if (data[0] + data[1] & 0x4)
auth[i] |= bit;
}
}
}
#else
{
int seed;
int value;
int i;
seed = (ldata[0]) + (ldata[1] << 16);
srand (seed);
for (i = 0; i < len; i++)
{
value = rand ();
auth[i] = value & 0xff;
}
value = len;
if (value > sizeof (key))
value = sizeof (key);
memmove( (char *) key, auth, value);
}
#endif
}
|
