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
|
/*
*
* K5stream
*
* Emulates the kstream package in Kerberos 4
*
*/
#include <stdio.h>
#include <io.h>
#include <malloc.h>
#include "telnet.h"
#include "k5stream.h"
#include "auth.h"
int
kstream_destroy(kstream ks)
{
if (ks != NULL) {
auth_destroy(ks); /* Destroy authorizing */
closesocket(ks->fd); /* Close the socket??? */
free(ks);
}
return 0;
}
void
kstream_set_buffer_mode(kstream ks, int mode)
{
}
kstream
kstream_create_from_fd(int fd,
const struct kstream_crypt_ctl_block *ctl,
kstream_ptr data)
{
kstream ks;
int n;
BOOL on = 1;
ks = malloc(sizeof(struct kstream_int));
if (ks == NULL)
return NULL;
ks->fd = fd;
setsockopt(ks->fd, SOL_SOCKET, SO_OOBINLINE, (const char *)&on, sizeof(on));
n = auth_init(ks, data); /* Initialize authorizing */
if (n) {
free(ks);
return NULL;
}
ks->encrypt = NULL;
ks->decrypt = NULL;
return ks;
}
int
kstream_write(kstream ks, void *p_data, size_t p_len)
{
int n;
struct kstream_data_block i;
#ifdef DEBUG
hexdump("plaintext:", p_data, p_len);
#endif
if (ks->encrypt) {
i.ptr = p_data;
i.length = p_len;
ks->encrypt(&i, NULL, NULL);
#ifdef DEBUG
hexdump("cyphertext:", p_data, p_len);
#endif
}
n = send(ks->fd, p_data, p_len, 0); /* Write the data */
return n; /* higher layer does retries */
}
int
kstream_read(kstream ks, void *p_data, size_t p_len)
{
int n;
struct kstream_data_block i;
n = recv(ks->fd, p_data, p_len, 0); /* read the data */
if (n < 0)
return n;
#ifdef DEBUG
hexdump("input data:", p_data, n);
#endif
if (ks->decrypt) {
extern int encrypt_flag;
if (encrypt_flag == 2)
encrypt_flag = 1;
i.ptr = p_data;
i.length = n;
ks->decrypt(&i, NULL, NULL);
#ifdef DEBUG
hexdump("decrypted data:", p_data, n);
#endif
}
return n; /* higher layer does retries */
}
|
