1 /* crypto/rand/rand_unix.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112 /*
113 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
114 * Use is subject to license terms.
115 */
116
117 #pragma ident "%Z%%M% %I% %E% SMI"
118
119 #include <stdio.h>
120
121 #define USE_SOCKETS
122 #include "e_os.h"
123 #include "cryptlib.h"
124 #include <openssl/rand.h>
125 #include "rand_lcl.h"
126
127 #if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE))
128
129 #include <sys/types.h>
130 #include <sys/time.h>
131 #include <sys/times.h>
132 #include <sys/stat.h>
133 #ifdef _BOOT
134 #include <sys/fcntl.h>
135 #else
136 #include <fcntl.h>
137 #endif
138 #include <unistd.h>
139 #include <time.h>
140
141 #ifdef __OpenBSD__
RAND_poll(void)142 int RAND_poll(void)
143 {
144 u_int32_t rnd = 0, i;
145 unsigned char buf[ENTROPY_NEEDED];
146
147 for (i = 0; i < sizeof(buf); i++) {
148 if (i % 4 == 0)
149 rnd = arc4random();
150 buf[i] = rnd;
151 rnd >>= 8;
152 }
153 RAND_add(buf, sizeof(buf), ENTROPY_NEEDED);
154 memset(buf, 0, sizeof(buf));
155
156 return 1;
157 }
158 #else
RAND_poll(void)159 int RAND_poll(void)
160 {
161 unsigned long l;
162 pid_t curr_pid = getpid();
163 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
164 unsigned char tmpbuf[ENTROPY_NEEDED];
165 int n = 0;
166 #endif
167 #ifdef DEVRANDOM
168 static const char *randomfiles[] = { DEVRANDOM };
169 struct stat randomstats[sizeof(randomfiles)/sizeof(randomfiles[0])];
170 int fd;
171 size_t i;
172 #endif
173 #ifdef DEVRANDOM_EGD
174 static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };
175 const char **egdsocket = NULL;
176 #endif
177
178 #ifdef DEVRANDOM
179 memset(randomstats,0,sizeof(randomstats));
180 /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD
181 * have this. Use /dev/urandom if you can as /dev/random may block
182 * if it runs out of random entries. */
183
184 for (i=0; i<sizeof(randomfiles)/sizeof(randomfiles[0]) && n < ENTROPY_NEEDED; i++)
185 {
186 if ((fd = open(randomfiles[i], O_RDONLY
187 #ifdef O_NONBLOCK
188 |O_NONBLOCK
189 #endif
190 #ifdef O_BINARY
191 |O_BINARY
192 #endif
193 #ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it
194 our controlling tty */
195 |O_NOCTTY
196 #endif
197 )) >= 0)
198 {
199 struct timeval t = { 0, 10*1000 }; /* Spend 10ms on
200 each file. */
201 int r;
202 size_t j;
203 fd_set fset;
204 struct stat *st=&randomstats[i];
205
206 /* Avoid using same input... Used to be O_NOFOLLOW
207 * above, but it's not universally appropriate... */
208 if (fstat(fd,st) != 0) { close(fd); continue; }
209 for (j=0;j<i;j++)
210 {
211 if (randomstats[j].st_ino==st->st_ino &&
212 randomstats[j].st_dev==st->st_dev)
213 break;
214 }
215 if (j<i) { close(fd); continue; }
216
217 do
218 {
219 #ifndef _BOOT
220 FD_ZERO(&fset);
221 FD_SET(fd, &fset);
222 r = -1;
223
224 if (select(fd+1,&fset,NULL,NULL,&t) < 0)
225 t.tv_usec=0;
226 else if (FD_ISSET(fd, &fset))
227 {
228 #endif /* !_BOOT */
229 r=read(fd,(unsigned char *)tmpbuf+n,
230 ENTROPY_NEEDED-n);
231 if (r > 0)
232 n += r;
233 #ifndef _BOOT
234 }
235
236 /* Some Unixen will update t, some
237 won't. For those who won't, give
238 up here, otherwise, we will do
239 this once again for the remaining
240 time. */
241 if (t.tv_usec == 10*1000)
242 t.tv_usec=0;
243 }
244 while ((r > 0 || (errno == EINTR || errno == EAGAIN))
245 && t.tv_usec != 0 && n < ENTROPY_NEEDED);
246 #else
247 }
248 while ((r > 0 && n < ENTROPY_NEEDED));
249
250 #endif /* !_BOOT */
251 close(fd);
252 }
253 }
254 #endif
255
256 #if defined(DEVRANDOM_EGD) && !defined(_BOOT)
257 /* Use an EGD socket to read entropy from an EGD or PRNGD entropy
258 * collecting daemon. */
259
260 for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++)
261 {
262 int r;
263
264 r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n,
265 ENTROPY_NEEDED-n);
266 if (r > 0)
267 n += r;
268 }
269 #endif
270
271 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
272 if (n > 0)
273 {
274 RAND_add(tmpbuf,sizeof tmpbuf,(double)n);
275 OPENSSL_cleanse(tmpbuf,n);
276 }
277 #endif
278
279 #ifndef _BOOT
280 /* put in some default random data, we need more than just this */
281 l=curr_pid;
282 RAND_add(&l,sizeof(l),0.0);
283 l=getuid();
284 RAND_add(&l,sizeof(l),0.0);
285
286 l=time(NULL);
287 RAND_add(&l,sizeof(l),0.0);
288 #endif /* !_BOOT */
289
290 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
291 return 1;
292 #else
293 return 0;
294 #endif
295 }
296
297 #endif
298 #endif
299
300 #if defined(OPENSSL_SYS_VXWORKS)
RAND_poll(void)301 int RAND_poll(void)
302 {
303 return 0;
304 }
305 #endif
306