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
|
/* $OpenBSD: lsb_addr_comp.c,v 1.4 1998/07/07 19:06:58 art Exp $ */
/* $KTH: lsb_addr_comp.c,v 1.14 1998/05/26 20:37:32 joda Exp $ */
/*
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb_locl.h"
#include "krb-archaeology.h"
int
krb_lsb_antinet_ulong_cmp(u_int32_t x, u_int32_t y)
{
int i;
u_int32_t a = 0, b = 0;
u_int8_t *p = (u_int8_t*) &x;
u_int8_t *q = (u_int8_t*) &y;
for(i = sizeof(u_int32_t) - 1; i >= 0; i--){
a = (a << 8) | p[i];
b = (b << 8) | q[i];
}
if(a > b)
return 1;
if(a < b)
return -1;
return 0;
}
int
krb_lsb_antinet_ushort_cmp(u_int16_t x, u_int16_t y)
{
int i;
u_int16_t a = 0, b = 0;
u_int8_t *p = (u_int8_t*) &x;
u_int8_t *q = (u_int8_t*) &y;
for(i = sizeof(u_int16_t) - 1; i >= 0; i--){
a = (a << 8) | p[i];
b = (b << 8) | q[i];
}
if(a > b)
return 1;
if(a < b)
return -1;
return 0;
}
u_int32_t
lsb_time(time_t t, struct sockaddr_in *src, struct sockaddr_in *dst)
{
int dir = 1;
const char *fw;
/*
* direction bit is the sign bit of the timestamp. Ok until
* 2038??
*/
if(krb_debug) {
krb_warning("lsb_time: src = %s:%u\n",
inet_ntoa(src->sin_addr), ntohs(src->sin_port));
krb_warning("lsb_time: dst = %s:%u\n",
inet_ntoa(dst->sin_addr), ntohs(dst->sin_port));
}
/* For compatibility with broken old code, compares are done in VAX
byte order (LSBFIRST) */
if (krb_lsb_antinet_ulong_less(src->sin_addr.s_addr, /* src < recv */
dst->sin_addr.s_addr) < 0)
dir = -1;
else if (krb_lsb_antinet_ulong_less(src->sin_addr.s_addr,
dst->sin_addr.s_addr)==0)
if (krb_lsb_antinet_ushort_less(src->sin_port, dst->sin_port) < 0)
dir = -1;
/*
* all that for one tiny bit! Heaven help those that talk to
* themselves.
*/
if(krb_get_config_bool("reverse_lsb_test")) {
if(krb_debug)
krb_warning("lsb_time: reversing direction: %d -> %d\n", dir, -dir);
dir = -dir;
}else if((fw = krb_get_config_string("firewall_address"))) {
struct in_addr fw_addr;
fw_addr.s_addr = inet_addr(fw);
if(fw_addr.s_addr != INADDR_NONE) {
int a, b, c;
krb_warning("lsb_time: fw = %s\n", inet_ntoa(fw_addr));
/* negate if src < dst and firewall is outside the
[src,dst] interval */
a = (krb_lsb_antinet_ulong_less(src->sin_addr.s_addr,
dst->sin_addr.s_addr) == -1);
b = (krb_lsb_antinet_ulong_less(src->sin_addr.s_addr,
fw_addr.s_addr) == 1);
c = (krb_lsb_antinet_ulong_less(fw_addr.s_addr,
dst->sin_addr.s_addr) == 1);
if(a && (b || c)) {
if(krb_debug)
krb_warning("lsb_time: reversing direction: %d -> %d\n",
dir, -dir);
dir = -dir;
}
}
}
t = t * dir;
t = t & 0xffffffff;
return t;
}
|
