summaryrefslogtreecommitdiff
path: root/bsd-misc.c
blob: 99fe298169027b274feffd9591b570417f4193ba (plain)
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
/*
**
** OpenBSD replacement routines
**
** Damien Miller <djm@ibs.com.au>
** 
** Copyright 1999 Damien Miller
** Copyright 1999 Internet Business Solutions
**
** 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 DAMIEN MILLER OR INTERNET
** BUSINESS SOLUTIONS 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 Internet Business
** Solutions shall not be used in advertising or otherwise to promote
** the sale, use or other dealings in this Software without prior
** written authorization from Internet Business Solutions.
**
*/

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif

#include "xmalloc.h"
#include "ssh.h"
#include "bsd-misc.h"
#include "random.h"

#ifndef HAVE_ARC4RANDOM

typedef struct
{
	unsigned int s[256];
	int i;
	int j;
} rc4_t;

void rc4_key(rc4_t *r, unsigned char *key, int len);
void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len);

static rc4_t *rc4 = NULL;

void rc4_key(rc4_t *r, unsigned char *key, int len)
{
	int t;
	
	for(r->i = 0; r->i < 256; r->i++)
		r->s[r->i] = r->i;

	r->j = 0;
	for(r->i = 0; r->i < 256; r->i++)
	{
		r->j = (r->j + r->s[r->i] + key[r->i % len]) % 256;
		t = r->s[r->i];
		r->s[r->i] = r->s[r->j];
		r->s[r->j] = t;
	}
	r->i = r->j = 0;
}

void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len)
{
	int t;
	int c;

	c = 0;	
	while(c < len)
	{
		r->i = (r->i + 1) % 256;
		r->j = (r->j + r->s[r->i]) % 256;
		t = r->s[r->i];
		r->s[r->i] = r->s[r->j];
		r->s[r->j] = t;

		t = (r->s[r->i] + r->s[r->j]) % 256;
		
		buffer[c] = r->s[t];
		c++;
	}
}

unsigned int arc4random(void)
{
	unsigned int r;

	if (rc4 == NULL)
		arc4random_stir();
	
	rc4_getbytes(rc4, (unsigned char *)&r, sizeof(r));
	
	return(r);
}

void arc4random_stir(void)
{
	unsigned char rand_buf[32];
	
	if (rc4 == NULL)
		rc4 = xmalloc(sizeof(*rc4));
	
	get_random_bytes(rand_buf, sizeof(rand_buf));
	rc4_key(rc4, rand_buf, sizeof(rand_buf));
	memset(rand_buf, 0, sizeof(rand_buf));
}
#endif /* !HAVE_ARC4RANDOM */

#ifndef HAVE_SETPROCTITLE
void setproctitle(const char *fmt, ...)
{
	/* FIXME */
}
#endif /* !HAVE_SETPROCTITLE */

#ifndef HAVE_SETENV
int setenv(const char *name, const char *value, int overwrite)
{
	char *env_string;
	int result;
	
	/* Don't overwrite existing env. var if overwrite is 0 */
	if (!overwrite && (getenv(name) != NULL))
		return(0);
	
	env_string = xmalloc(strlen(name) + strlen(value) + 2);
	sprintf(env_string, "%s=%s", name, value);
	
	result = putenv(env_string);
	
	xfree(env_string);
	
	return(result);	
}
#endif /* !HAVE_SETENV */

#ifndef HAVE_SETLOGIN
int setlogin(const char *name)
{
	return(0);
}
#endif /* !HAVE_SETLOGIN */

#ifndef HAVE_INNETGR
int innetgr(const char *netgroup, const char *host, 
            const char *user, const char *domain)
{
	return(0);
}
#endif /* HAVE_INNETGR */

#if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID)
int seteuid(uid_t euid)
{
	return(setreuid(-1,euid));
}
#endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */