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) 1998-2006 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 #include <stdio.h>
112
113 #define USE_SOCKETS
114 #include "e_os.h"
115 #include "cryptlib.h"
116 #include <openssl/rand.h>
117 #include "rand_lcl.h"
118
119 #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))
120
121 #include <sys/types.h>
122 #include <sys/time.h>
123 #include <sys/times.h>
124 #include <sys/stat.h>
125 #include <fcntl.h>
126 #include <unistd.h>
127 #include <time.h>
128 #if defined(OPENSSL_SYS_LINUX) /* should actually be available virtually everywhere */
129 # include <poll.h>
130 #endif
131 #include <limits.h>
132 #ifndef FD_SETSIZE
133 # define FD_SETSIZE (8*sizeof(fd_set))
134 #endif
135
136 #if defined(OPENSSL_SYS_VOS)
137
138 /* The following algorithm repeatedly samples the real-time clock
139 (RTC) to generate a sequence of unpredictable data. The algorithm
140 relies upon the uneven execution speed of the code (due to factors
141 such as cache misses, interrupts, bus activity, and scheduling) and
142 upon the rather large relative difference between the speed of the
143 clock and the rate at which it can be read.
144
145 If this code is ported to an environment where execution speed is
146 more constant or where the RTC ticks at a much slower rate, or the
147 clock can be read with fewer instructions, it is likely that the
148 results would be far more predictable.
149
150 As a precaution, we generate 4 times the minimum required amount of
151 seed data. */
152
153 int RAND_poll(void)
154 {
155 short int code;
156 gid_t curr_gid;
157 pid_t curr_pid;
158 uid_t curr_uid;
159 int i, k;
160 struct timespec ts;
161 unsigned char v;
162
163 #ifdef OPENSSL_SYS_VOS_HPPA
164 long duration;
165 extern void s$sleep (long *_duration, short int *_code);
166 #else
167 #ifdef OPENSSL_SYS_VOS_IA32
168 long long duration;
169 extern void s$sleep2 (long long *_duration, short int *_code);
170 #else
171 #error "Unsupported Platform."
172 #endif /* OPENSSL_SYS_VOS_IA32 */
173 #endif /* OPENSSL_SYS_VOS_HPPA */
174
175 /* Seed with the gid, pid, and uid, to ensure *some*
176 variation between different processes. */
177
178 curr_gid = getgid();
179 RAND_add (&curr_gid, sizeof curr_gid, 1);
180 curr_gid = 0;
181
182 curr_pid = getpid();
183 RAND_add (&curr_pid, sizeof curr_pid, 1);
184 curr_pid = 0;
185
186 curr_uid = getuid();
187 RAND_add (&curr_uid, sizeof curr_uid, 1);
188 curr_uid = 0;
189
190 for (i=0; i<(ENTROPY_NEEDED*4); i++)
191 {
192 /* burn some cpu; hope for interrupts, cache
193 collisions, bus interference, etc. */
194 for (k=0; k<99; k++)
195 ts.tv_nsec = random ();
196
197 #ifdef OPENSSL_SYS_VOS_HPPA
198 /* sleep for 1/1024 of a second (976 us). */
199 duration = 1;
200 s$sleep (&duration, &code);
201 #else
202 #ifdef OPENSSL_SYS_VOS_IA32
203 /* sleep for 1/65536 of a second (15 us). */
204 duration = 1;
205 s$sleep2 (&duration, &code);
206 #endif /* OPENSSL_SYS_VOS_IA32 */
207 #endif /* OPENSSL_SYS_VOS_HPPA */
208
209 /* get wall clock time. */
210 clock_gettime (CLOCK_REALTIME, &ts);
211
212 /* take 8 bits */
213 v = (unsigned char) (ts.tv_nsec % 256);
214 RAND_add (&v, sizeof v, 1);
215 v = 0;
216 }
217 return 1;
218 }
219 #elif defined __OpenBSD__
220 int RAND_poll(void)
221 {
222 u_int32_t rnd = 0, i;
223 unsigned char buf[ENTROPY_NEEDED];
224
225 for (i = 0; i < sizeof(buf); i++) {
226 if (i % 4 == 0)
227 rnd = arc4random();
228 buf[i] = rnd;
229 rnd >>= 8;
230 }
231 RAND_add(buf, sizeof(buf), ENTROPY_NEEDED);
232 memset(buf, 0, sizeof(buf));
233
234 return 1;
235 }
236 #else /* !defined(__OpenBSD__) */
237 int RAND_poll(void)
238 {
239 unsigned long l;
240 pid_t curr_pid = getpid();
241 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
242 unsigned char tmpbuf[ENTROPY_NEEDED];
243 int n = 0;
244 #endif
245 #ifdef DEVRANDOM
246 static const char *randomfiles[] = { DEVRANDOM };
247 struct stat randomstats[sizeof(randomfiles)/sizeof(randomfiles[0])];
248 int fd;
249 unsigned int i;
250 #endif
251 #ifdef DEVRANDOM_EGD
252 static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };
253 const char **egdsocket = NULL;
254 #endif
255
256 #ifdef DEVRANDOM
257 memset(randomstats,0,sizeof(randomstats));
258 /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD
259 * have this. Use /dev/urandom if you can as /dev/random may block
260 * if it runs out of random entries. */
261
262 for (i = 0; (i < sizeof(randomfiles)/sizeof(randomfiles[0])) &&
263 (n < ENTROPY_NEEDED); i++)
264 {
265 if ((fd = open(randomfiles[i], O_RDONLY
266 #ifdef O_NONBLOCK
267 |O_NONBLOCK
268 #endif
269 #ifdef O_BINARY
270 |O_BINARY
271 #endif
272 #ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it
273 our controlling tty */
274 |O_NOCTTY
275 #endif
276 )) >= 0)
277 {
278 int usec = 10*1000; /* spend 10ms on each file */
279 int r;
280 unsigned int j;
281 struct stat *st=&randomstats[i];
282
283 /* Avoid using same input... Used to be O_NOFOLLOW
284 * above, but it's not universally appropriate... */
285 if (fstat(fd,st) != 0) { close(fd); continue; }
286 for (j=0;j<i;j++)
287 {
288 if (randomstats[j].st_ino==st->st_ino &&
289 randomstats[j].st_dev==st->st_dev)
290 break;
291 }
292 if (j<i) { close(fd); continue; }
293
294 do
295 {
296 int try_read = 0;
297
298 #if defined(OPENSSL_SYS_BEOS_R5)
299 /* select() is broken in BeOS R5, so we simply
300 * try to read something and snooze if we couldn't */
301 try_read = 1;
302
303 #elif defined(OPENSSL_SYS_LINUX)
304 /* use poll() */
305 struct pollfd pset;
306
307 pset.fd = fd;
308 pset.events = POLLIN;
309 pset.revents = 0;
310
311 if (poll(&pset, 1, usec / 1000) < 0)
312 usec = 0;
313 else
314 try_read = (pset.revents & POLLIN) != 0;
315
316 #else
317 /* use select() */
318 fd_set fset;
319 struct timeval t;
320
321 t.tv_sec = 0;
322 t.tv_usec = usec;
323
324 if (FD_SETSIZE > 0 && (unsigned)fd >= FD_SETSIZE)
325 {
326 /* can't use select, so just try to read once anyway */
327 try_read = 1;
328 }
329 else
330 {
331 FD_ZERO(&fset);
332 FD_SET(fd, &fset);
333
334 if (select(fd+1,&fset,NULL,NULL,&t) >= 0)
335 {
336 usec = t.tv_usec;
337 if (FD_ISSET(fd, &fset))
338 try_read = 1;
339 }
340 else
341 usec = 0;
342 }
343 #endif
344
345 if (try_read)
346 {
347 r = read(fd,(unsigned char *)tmpbuf+n, ENTROPY_NEEDED-n);
348 if (r > 0)
349 n += r;
350 #if defined(OPENSSL_SYS_BEOS_R5)
351 if (r == 0)
352 snooze(t.tv_usec);
353 #endif
354 }
355 else
356 r = -1;
357
358 /* Some Unixen will update t in select(), some
359 won't. For those who won't, or if we
360 didn't use select() in the first place,
361 give up here, otherwise, we will do
362 this once again for the remaining
363 time. */
364 if (usec == 10*1000)
365 usec = 0;
366 }
367 while ((r > 0 ||
368 (errno == EINTR || errno == EAGAIN)) && usec != 0 && n < ENTROPY_NEEDED);
369
370 close(fd);
371 }
372 }
373 #endif /* defined(DEVRANDOM) */
374
375 #ifdef DEVRANDOM_EGD
376 /* Use an EGD socket to read entropy from an EGD or PRNGD entropy
377 * collecting daemon. */
378
379 for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++)
380 {
381 int r;
382
383 r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n,
384 ENTROPY_NEEDED-n);
385 if (r > 0)
386 n += r;
387 }
388 #endif /* defined(DEVRANDOM_EGD) */
389
390 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
391 if (n > 0)
392 {
393 RAND_add(tmpbuf,sizeof tmpbuf,(double)n);
394 OPENSSL_cleanse(tmpbuf,n);
395 }
396 #endif
397
398 /* put in some default random data, we need more than just this */
399 l=curr_pid;
400 RAND_add(&l,sizeof(l),0.0);
401 l=getuid();
402 RAND_add(&l,sizeof(l),0.0);
403
404 l=time(NULL);
405 RAND_add(&l,sizeof(l),0.0);
406
407 #if defined(OPENSSL_SYS_BEOS)
408 {
409 system_info sysInfo;
410 get_system_info(&sysInfo);
411 RAND_add(&sysInfo,sizeof(sysInfo),0);
412 }
413 #endif
414
415 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD)
416 return 1;
417 #else
418 return 0;
419 #endif
420 }
421
422 #endif /* defined(__OpenBSD__) */
423 #endif /* !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE)) */
424
425
426 #if defined(OPENSSL_SYS_VXWORKS)
427 int RAND_poll(void)
428 {
429 return 0;
430 }
431 #endif