Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 2 | * Copyright (c) 1999-2000 Damien Miller. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
| 12 | * 3. All advertising materials mentioning features or use of this software |
| 13 | * must display the following acknowledgement: |
| 14 | * This product includes software developed by Markus Friedl. |
| 15 | * 4. The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 29 | |
Damien Miller | 6b85a7f | 2000-01-02 11:45:33 +1100 | [diff] [blame] | 30 | #include "config.h" |
| 31 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 32 | #include <stdio.h> |
| 33 | #include <stdlib.h> |
| 34 | #include <string.h> |
| 35 | #include <errno.h> |
| 36 | #include <unistd.h> |
| 37 | |
| 38 | #include <sys/types.h> |
| 39 | #include <sys/stat.h> |
| 40 | #include <fcntl.h> |
Damien Miller | 1fa154b | 2000-01-23 10:32:03 +1100 | [diff] [blame] | 41 | #ifdef HAVE_STDDEF_H |
| 42 | #include <stddef.h> |
| 43 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 44 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 45 | #include "xmalloc.h" |
Damien Miller | ab18c41 | 1999-11-11 10:40:23 +1100 | [diff] [blame] | 46 | #include "ssh.h" |
Damien Miller | 753331e | 1999-12-30 01:29:35 +1100 | [diff] [blame] | 47 | #include "bsd-misc.h" |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 48 | #include "entropy.h" |
Damien Miller | 58fc473 | 1999-11-19 12:05:01 +1100 | [diff] [blame] | 49 | |
Damien Miller | 8bb73be | 2000-04-19 16:26:12 +1000 | [diff] [blame] | 50 | #include <openssl/rand.h> |
| 51 | |
Damien Miller | e413cba | 1999-10-28 14:12:54 +1000 | [diff] [blame] | 52 | #ifndef HAVE_ARC4RANDOM |
| 53 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 54 | typedef struct |
| 55 | { |
| 56 | unsigned int s[256]; |
| 57 | int i; |
| 58 | int j; |
| 59 | } rc4_t; |
| 60 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 61 | void rc4_key(rc4_t *r, unsigned char *key, int len); |
| 62 | void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 63 | |
| 64 | static rc4_t *rc4 = NULL; |
| 65 | |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 66 | void rc4_key(rc4_t *r, unsigned char *key, int len) |
| 67 | { |
| 68 | int t; |
| 69 | |
| 70 | for(r->i = 0; r->i < 256; r->i++) |
| 71 | r->s[r->i] = r->i; |
| 72 | |
| 73 | r->j = 0; |
| 74 | for(r->i = 0; r->i < 256; r->i++) |
| 75 | { |
| 76 | r->j = (r->j + r->s[r->i] + key[r->i % len]) % 256; |
| 77 | t = r->s[r->i]; |
| 78 | r->s[r->i] = r->s[r->j]; |
| 79 | r->s[r->j] = t; |
| 80 | } |
| 81 | r->i = r->j = 0; |
| 82 | } |
| 83 | |
| 84 | void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len) |
| 85 | { |
| 86 | int t; |
| 87 | int c; |
| 88 | |
| 89 | c = 0; |
| 90 | while(c < len) |
| 91 | { |
| 92 | r->i = (r->i + 1) % 256; |
| 93 | r->j = (r->j + r->s[r->i]) % 256; |
| 94 | t = r->s[r->i]; |
| 95 | r->s[r->i] = r->s[r->j]; |
| 96 | r->s[r->j] = t; |
| 97 | |
| 98 | t = (r->s[r->i] + r->s[r->j]) % 256; |
| 99 | |
| 100 | buffer[c] = r->s[t]; |
| 101 | c++; |
| 102 | } |
| 103 | } |
| 104 | |
Damien Miller | 3d112ef | 1999-10-28 13:20:30 +1000 | [diff] [blame] | 105 | unsigned int arc4random(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 106 | { |
Damien Miller | 3d112ef | 1999-10-28 13:20:30 +1000 | [diff] [blame] | 107 | unsigned int r; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 108 | |
| 109 | if (rc4 == NULL) |
| 110 | arc4random_stir(); |
| 111 | |
Damien Miller | 3d112ef | 1999-10-28 13:20:30 +1000 | [diff] [blame] | 112 | rc4_getbytes(rc4, (unsigned char *)&r, sizeof(r)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 113 | |
| 114 | return(r); |
| 115 | } |
| 116 | |
| 117 | void arc4random_stir(void) |
| 118 | { |
| 119 | unsigned char rand_buf[32]; |
| 120 | |
| 121 | if (rc4 == NULL) |
| 122 | rc4 = xmalloc(sizeof(*rc4)); |
Damien Miller | 040f383 | 2000-04-03 14:50:43 +1000 | [diff] [blame] | 123 | |
| 124 | seed_rng(); |
| 125 | RAND_bytes(rand_buf, sizeof(rand_buf)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 126 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 127 | rc4_key(rc4, rand_buf, sizeof(rand_buf)); |
Damien Miller | f07390e | 2000-01-29 20:40:22 +1100 | [diff] [blame] | 128 | memset(rand_buf, 0, sizeof(rand_buf)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 129 | } |
Damien Miller | e413cba | 1999-10-28 14:12:54 +1000 | [diff] [blame] | 130 | #endif /* !HAVE_ARC4RANDOM */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 131 | |
Damien Miller | e413cba | 1999-10-28 14:12:54 +1000 | [diff] [blame] | 132 | #ifndef HAVE_SETPROCTITLE |
| 133 | void setproctitle(const char *fmt, ...) |
| 134 | { |
| 135 | /* FIXME */ |
| 136 | } |
| 137 | #endif /* !HAVE_SETPROCTITLE */ |
Damien Miller | d770252 | 1999-11-22 16:11:05 +1100 | [diff] [blame] | 138 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 139 | #ifndef HAVE_SETLOGIN |
| 140 | int setlogin(const char *name) |
| 141 | { |
| 142 | return(0); |
| 143 | } |
| 144 | #endif /* !HAVE_SETLOGIN */ |
| 145 | |
| 146 | #ifndef HAVE_INNETGR |
| 147 | int innetgr(const char *netgroup, const char *host, |
| 148 | const char *user, const char *domain) |
| 149 | { |
| 150 | return(0); |
| 151 | } |
| 152 | #endif /* HAVE_INNETGR */ |
| 153 | |
| 154 | #if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) |
| 155 | int seteuid(uid_t euid) |
| 156 | { |
| 157 | return(setreuid(-1,euid)); |
| 158 | } |
| 159 | #endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */ |