1 /* crypto/rand/rand_unix.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) 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 #ifdef __VOS__ 137 int RAND_poll(void) 138 { 139 unsigned char buf[ENTROPY_NEEDED]; 140 pid_t curr_pid; 141 uid_t curr_uid; 142 static int first=1; 143 int i; 144 long rnd = 0; 145 struct timespec ts; 146 unsigned seed; 147 148 /* The VOS random() function starts from a static seed so its 149 initial value is predictable. If random() returns the 150 initial value, reseed it with dynamic data. The VOS 151 real-time clock has a granularity of 1 nsec so it should be 152 reasonably difficult to predict its exact value. Do not 153 gratuitously reseed the PRNG because other code in this 154 process or thread may be using it. */ 155 156 if (first) { 157 first = 0; 158 rnd = random (); 159 if (rnd == 1804289383) { 160 clock_gettime (CLOCK_REALTIME, &ts); 161 curr_pid = getpid(); 162 curr_uid = getuid(); 163 seed = ts.tv_sec ^ ts.tv_nsec ^ curr_pid ^ curr_uid; 164 srandom (seed); 165 } 166 } 167 168 for (i = 0; i < sizeof(buf); i++) { 169 if (i % 4 == 0) 170 rnd = random(); 171 buf[i] = rnd; 172 rnd >>= 8; 173 } 174 RAND_add(buf, sizeof(buf), ENTROPY_NEEDED); 175 memset(buf, 0, sizeof(buf)); 176 177 return 1; 178 } 179 #elif defined __OpenBSD__ 180 int RAND_poll(void) 181 { 182 u_int32_t rnd = 0, i; 183 unsigned char buf[ENTROPY_NEEDED]; 184 185 for (i = 0; i < sizeof(buf); i++) { 186 if (i % 4 == 0) 187 rnd = arc4random(); 188 buf[i] = rnd; 189 rnd >>= 8; 190 } 191 RAND_add(buf, sizeof(buf), ENTROPY_NEEDED); 192 memset(buf, 0, sizeof(buf)); 193 194 return 1; 195 } 196 #else /* !defined(__OpenBSD__) */ 197 int RAND_poll(void) 198 { 199 unsigned long l; 200 pid_t curr_pid = getpid(); 201 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) 202 unsigned char tmpbuf[ENTROPY_NEEDED]; 203 int n = 0; 204 #endif 205 #ifdef DEVRANDOM 206 static const char *randomfiles[] = { DEVRANDOM }; 207 struct stat randomstats[sizeof(randomfiles)/sizeof(randomfiles[0])]; 208 int fd; 209 unsigned int i; 210 #endif 211 #ifdef DEVRANDOM_EGD 212 static const char *egdsockets[] = { DEVRANDOM_EGD, NULL }; 213 const char **egdsocket = NULL; 214 #endif 215 216 #ifdef DEVRANDOM 217 memset(randomstats,0,sizeof(randomstats)); 218 /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD 219 * have this. Use /dev/urandom if you can as /dev/random may block 220 * if it runs out of random entries. */ 221 222 for (i = 0; (i < sizeof(randomfiles)/sizeof(randomfiles[0])) && 223 (n < ENTROPY_NEEDED); i++) 224 { 225 if ((fd = open(randomfiles[i], O_RDONLY 226 #ifdef O_NONBLOCK 227 |O_NONBLOCK 228 #endif 229 #ifdef O_BINARY 230 |O_BINARY 231 #endif 232 #ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it 233 our controlling tty */ 234 |O_NOCTTY 235 #endif 236 )) >= 0) 237 { 238 int usec = 10*1000; /* spend 10ms on each file */ 239 int r; 240 unsigned int j; 241 struct stat *st=&randomstats[i]; 242 243 /* Avoid using same input... Used to be O_NOFOLLOW 244 * above, but it's not universally appropriate... */ 245 if (fstat(fd,st) != 0) { close(fd); continue; } 246 for (j=0;j<i;j++) 247 { 248 if (randomstats[j].st_ino==st->st_ino && 249 randomstats[j].st_dev==st->st_dev) 250 break; 251 } 252 if (j<i) { close(fd); continue; } 253 254 do 255 { 256 int try_read = 0; 257 258 #if defined(OPENSSL_SYS_BEOS_R5) 259 /* select() is broken in BeOS R5, so we simply 260 * try to read something and snooze if we couldn't */ 261 try_read = 1; 262 263 #elif defined(OPENSSL_SYS_LINUX) 264 /* use poll() */ 265 struct pollfd pset; 266 267 pset.fd = fd; 268 pset.events = POLLIN; 269 pset.revents = 0; 270 271 if (poll(&pset, 1, usec / 1000) < 0) 272 usec = 0; 273 else 274 try_read = (pset.revents & POLLIN) != 0; 275 276 #else 277 /* use select() */ 278 fd_set fset; 279 struct timeval t; 280 281 t.tv_sec = 0; 282 t.tv_usec = usec; 283 284 if (FD_SETSIZE > 0 && (unsigned)fd >= FD_SETSIZE) 285 { 286 /* can't use select, so just try to read once anyway */ 287 try_read = 1; 288 } 289 else 290 { 291 FD_ZERO(&fset); 292 FD_SET(fd, &fset); 293 294 if (select(fd+1,&fset,NULL,NULL,&t) >= 0) 295 { 296 usec = t.tv_usec; 297 if (FD_ISSET(fd, &fset)) 298 try_read = 1; 299 } 300 else 301 usec = 0; 302 } 303 #endif 304 305 if (try_read) 306 { 307 r = read(fd,(unsigned char *)tmpbuf+n, ENTROPY_NEEDED-n); 308 if (r > 0) 309 n += r; 310 #if defined(OPENSSL_SYS_BEOS_R5) 311 if (r == 0) 312 snooze(t.tv_usec); 313 #endif 314 } 315 else 316 r = -1; 317 318 /* Some Unixen will update t in select(), some 319 won't. For those who won't, or if we 320 didn't use select() in the first place, 321 give up here, otherwise, we will do 322 this once again for the remaining 323 time. */ 324 if (usec == 10*1000) 325 usec = 0; 326 } 327 while ((r > 0 || 328 (errno == EINTR || errno == EAGAIN)) && usec != 0 && n < ENTROPY_NEEDED); 329 330 close(fd); 331 } 332 } 333 #endif /* defined(DEVRANDOM) */ 334 335 #ifdef DEVRANDOM_EGD 336 /* Use an EGD socket to read entropy from an EGD or PRNGD entropy 337 * collecting daemon. */ 338 339 for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++) 340 { 341 int r; 342 343 r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n, 344 ENTROPY_NEEDED-n); 345 if (r > 0) 346 n += r; 347 } 348 #endif /* defined(DEVRANDOM_EGD) */ 349 350 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) 351 if (n > 0) 352 { 353 RAND_add(tmpbuf,sizeof tmpbuf,(double)n); 354 OPENSSL_cleanse(tmpbuf,n); 355 } 356 #endif 357 358 /* put in some default random data, we need more than just this */ 359 l=curr_pid; 360 RAND_add(&l,sizeof(l),0.0); 361 l=getuid(); 362 RAND_add(&l,sizeof(l),0.0); 363 364 l=time(NULL); 365 RAND_add(&l,sizeof(l),0.0); 366 367 #if defined(OPENSSL_SYS_BEOS) 368 { 369 system_info sysInfo; 370 get_system_info(&sysInfo); 371 RAND_add(&sysInfo,sizeof(sysInfo),0); 372 } 373 #endif 374 375 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) 376 return 1; 377 #else 378 return 0; 379 #endif 380 } 381 382 #endif /* defined(__OpenBSD__) */ 383 #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)) */ 384 385 386 #if defined(OPENSSL_SYS_VXWORKS) 387 int RAND_poll(void) 388 { 389 return 0; 390 } 391 #endif 392
