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
|
/*
Copyright 1988, 1998 The Open Group
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.
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 OPEN GROUP 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 Open Group 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 Open Group.
*/
/*
* MIT-MAGIC-COOKIE-1 authorization scheme
* Author: Keith Packard, MIT X Consortium
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <X11/X.h>
#include "os.h"
#include "osdep.h"
#include "dixstruct.h"
static struct auth {
struct auth *next;
unsigned short len;
char *data;
XID id;
} *mit_auth;
int
MitAddCookie (
unsigned short data_length,
const char *data,
XID id)
{
struct auth *new;
new = malloc(sizeof (struct auth));
if (!new)
return 0;
new->data = malloc((unsigned) data_length);
if (!new->data) {
free(new);
return 0;
}
new->next = mit_auth;
mit_auth = new;
memmove(new->data, data, (int) data_length);
new->len = data_length;
new->id = id;
return 1;
}
XID
MitCheckCookie (
unsigned short data_length,
const char *data,
ClientPtr client,
char **reason)
{
struct auth *auth;
for (auth = mit_auth; auth; auth=auth->next) {
if (data_length == auth->len &&
memcmp (data, auth->data, (int) data_length) == 0)
return auth->id;
}
*reason = "Invalid MIT-MAGIC-COOKIE-1 key";
return (XID) -1;
}
int
MitResetCookie (void)
{
struct auth *auth, *next;
for (auth = mit_auth; auth; auth=next) {
next = auth->next;
free(auth->data);
free(auth);
}
mit_auth = 0;
return 0;
}
XID
MitToID (
unsigned short data_length,
char *data)
{
struct auth *auth;
for (auth = mit_auth; auth; auth=auth->next) {
if (data_length == auth->len &&
memcmp (data, auth->data, data_length) == 0)
return auth->id;
}
return (XID) -1;
}
int
MitFromID (
XID id,
unsigned short *data_lenp,
char **datap)
{
struct auth *auth;
for (auth = mit_auth; auth; auth=auth->next) {
if (id == auth->id) {
*data_lenp = auth->len;
*datap = auth->data;
return 1;
}
}
return 0;
}
int
MitRemoveCookie (
unsigned short data_length,
const char *data)
{
struct auth *auth, *prev;
prev = 0;
for (auth = mit_auth; auth; prev = auth, auth=auth->next) {
if (data_length == auth->len &&
memcmp (data, auth->data, data_length) == 0)
{
if (prev)
prev->next = auth->next;
else
mit_auth = auth->next;
free(auth->data);
free(auth);
return 1;
}
}
return 0;
}
#ifdef XCSECURITY
static char cookie[16]; /* 128 bits */
XID
MitGenerateCookie (
unsigned data_length,
const char *data,
XID id,
unsigned *data_length_return,
char **data_return)
{
int i = 0;
int status;
while (data_length--)
{
cookie[i++] += *data++;
if (i >= sizeof (cookie)) i = 0;
}
GenerateRandomData(sizeof (cookie), cookie);
status = MitAddCookie(sizeof (cookie), cookie, id);
if (!status)
{
id = -1;
}
else
{
*data_return = cookie;
*data_length_return = sizeof (cookie);
}
return id;
}
#endif /* XCSECURITY */
|
