mirror of
https://github.com/openssl/openssl.git
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325 lines
9.4 KiB
C
325 lines
9.4 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#define USE_SOCKETS
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#include "e_os.h"
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#include "internal/cryptlib.h"
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#include <openssl/rand.h>
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#include "rand_lcl.h"
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#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI))
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# include <sys/types.h>
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# include <sys/time.h>
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# include <sys/times.h>
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# include <sys/stat.h>
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# include <fcntl.h>
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# include <unistd.h>
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# include <time.h>
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# if defined(OPENSSL_SYS_LINUX) /* should actually be available virtually
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* everywhere */
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# include <poll.h>
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# endif
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# include <limits.h>
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# ifndef FD_SETSIZE
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# define FD_SETSIZE (8*sizeof(fd_set))
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# endif
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# if defined(OPENSSL_SYS_VOS)
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/*
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* The following algorithm repeatedly samples the real-time clock (RTC) to
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* generate a sequence of unpredictable data. The algorithm relies upon the
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* uneven execution speed of the code (due to factors such as cache misses,
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* interrupts, bus activity, and scheduling) and upon the rather large
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* relative difference between the speed of the clock and the rate at which
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* it can be read.
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*
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* If this code is ported to an environment where execution speed is more
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* constant or where the RTC ticks at a much slower rate, or the clock can be
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* read with fewer instructions, it is likely that the results would be far
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* more predictable.
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*
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* As a precaution, we generate 4 times the minimum required amount of seed
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* data.
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*/
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int RAND_poll(void)
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{
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short int code;
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gid_t curr_gid;
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pid_t curr_pid;
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uid_t curr_uid;
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int i, k;
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struct timespec ts;
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unsigned char v;
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# ifdef OPENSSL_SYS_VOS_HPPA
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long duration;
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extern void s$sleep(long *_duration, short int *_code);
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# else
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# ifdef OPENSSL_SYS_VOS_IA32
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long long duration;
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extern void s$sleep2(long long *_duration, short int *_code);
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# else
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# error "Unsupported Platform."
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# endif /* OPENSSL_SYS_VOS_IA32 */
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# endif /* OPENSSL_SYS_VOS_HPPA */
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/*
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* Seed with the gid, pid, and uid, to ensure *some* variation between
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* different processes.
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*/
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curr_gid = getgid();
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RAND_add(&curr_gid, sizeof curr_gid, 1);
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curr_gid = 0;
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curr_pid = getpid();
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RAND_add(&curr_pid, sizeof curr_pid, 1);
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curr_pid = 0;
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curr_uid = getuid();
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RAND_add(&curr_uid, sizeof curr_uid, 1);
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curr_uid = 0;
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for (i = 0; i < (ENTROPY_NEEDED * 4); i++) {
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/*
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* burn some cpu; hope for interrupts, cache collisions, bus
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* interference, etc.
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*/
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for (k = 0; k < 99; k++)
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ts.tv_nsec = random();
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# ifdef OPENSSL_SYS_VOS_HPPA
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/* sleep for 1/1024 of a second (976 us). */
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duration = 1;
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s$sleep(&duration, &code);
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# else
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# ifdef OPENSSL_SYS_VOS_IA32
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/* sleep for 1/65536 of a second (15 us). */
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duration = 1;
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s$sleep2(&duration, &code);
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# endif /* OPENSSL_SYS_VOS_IA32 */
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# endif /* OPENSSL_SYS_VOS_HPPA */
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/* get wall clock time. */
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clock_gettime(CLOCK_REALTIME, &ts);
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/* take 8 bits */
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v = (unsigned char)(ts.tv_nsec % 256);
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RAND_add(&v, sizeof v, 1);
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v = 0;
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}
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return 1;
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}
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# elif defined __OpenBSD__
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int RAND_poll(void)
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{
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u_int32_t rnd = 0, i;
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unsigned char buf[ENTROPY_NEEDED];
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for (i = 0; i < sizeof(buf); i++) {
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if (i % 4 == 0)
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rnd = arc4random();
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buf[i] = rnd;
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rnd >>= 8;
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}
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RAND_add(buf, sizeof(buf), ENTROPY_NEEDED);
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memset(buf, 0, sizeof(buf));
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return 1;
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}
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# else /* !defined(__OpenBSD__) */
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int RAND_poll(void)
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{
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unsigned long l;
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pid_t curr_pid = getpid();
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# if defined(DEVRANDOM) || (!defined(OPENSS_NO_EGD) && defined(DEVRANDOM_EGD))
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unsigned char tmpbuf[ENTROPY_NEEDED];
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int n = 0;
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# endif
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# ifdef DEVRANDOM
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static const char *randomfiles[] = { DEVRANDOM };
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struct stat randomstats[OSSL_NELEM(randomfiles)];
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int fd;
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unsigned int i;
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# endif
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# if !defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD)
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static const char *egdsockets[] = { DEVRANDOM_EGD, NULL };
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const char **egdsocket = NULL;
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# endif
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# ifdef DEVRANDOM
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memset(randomstats, 0, sizeof(randomstats));
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/*
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* Use a random entropy pool device. Linux, FreeBSD and OpenBSD have
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* this. Use /dev/urandom if you can as /dev/random may block if it runs
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* out of random entries.
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*/
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for (i = 0; (i < OSSL_NELEM(randomfiles)) && (n < ENTROPY_NEEDED); i++) {
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if ((fd = open(randomfiles[i], O_RDONLY
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# ifdef O_NONBLOCK
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| O_NONBLOCK
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# endif
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# ifdef O_BINARY
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| O_BINARY
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# endif
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# ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do
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* not make it our controlling tty */
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| O_NOCTTY
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# endif
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)) >= 0) {
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int usec = 10 * 1000; /* spend 10ms on each file */
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int r;
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unsigned int j;
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struct stat *st = &randomstats[i];
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/*
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* Avoid using same input... Used to be O_NOFOLLOW above, but
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* it's not universally appropriate...
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*/
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if (fstat(fd, st) != 0) {
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close(fd);
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continue;
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}
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for (j = 0; j < i; j++) {
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if (randomstats[j].st_ino == st->st_ino &&
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randomstats[j].st_dev == st->st_dev)
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break;
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}
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if (j < i) {
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close(fd);
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continue;
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}
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do {
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int try_read = 0;
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# if defined(OPENSSL_SYS_LINUX)
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/* use poll() */
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struct pollfd pset;
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pset.fd = fd;
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pset.events = POLLIN;
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pset.revents = 0;
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if (poll(&pset, 1, usec / 1000) < 0)
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usec = 0;
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else
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try_read = (pset.revents & POLLIN) != 0;
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# else
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/* use select() */
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fd_set fset;
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struct timeval t;
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t.tv_sec = 0;
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t.tv_usec = usec;
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if (FD_SETSIZE > 0 && (unsigned)fd >= FD_SETSIZE) {
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/*
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* can't use select, so just try to read once anyway
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*/
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try_read = 1;
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} else {
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FD_ZERO(&fset);
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FD_SET(fd, &fset);
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if (select(fd + 1, &fset, NULL, NULL, &t) >= 0) {
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usec = t.tv_usec;
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if (FD_ISSET(fd, &fset))
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try_read = 1;
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} else
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usec = 0;
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}
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# endif
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if (try_read) {
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r = read(fd, (unsigned char *)tmpbuf + n,
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ENTROPY_NEEDED - n);
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if (r > 0)
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n += r;
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} else
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r = -1;
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/*
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* Some Unixen will update t in select(), some won't. For
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* those who won't, or if we didn't use select() in the first
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* place, give up here, otherwise, we will do this once again
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* for the remaining time.
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*/
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if (usec == 10 * 1000)
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usec = 0;
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}
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while ((r > 0 ||
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(errno == EINTR || errno == EAGAIN)) && usec != 0
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&& n < ENTROPY_NEEDED);
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close(fd);
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}
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}
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# endif /* defined(DEVRANDOM) */
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# if !defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD)
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/*
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* Use an EGD socket to read entropy from an EGD or PRNGD entropy
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* collecting daemon.
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*/
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for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED;
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egdsocket++) {
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int r;
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r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf + n,
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ENTROPY_NEEDED - n);
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if (r > 0)
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n += r;
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}
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# endif /* defined(DEVRANDOM_EGD) */
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# if defined(DEVRANDOM) || (!defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD))
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if (n > 0) {
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RAND_add(tmpbuf, sizeof tmpbuf, (double)n);
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OPENSSL_cleanse(tmpbuf, n);
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}
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# endif
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/* put in some default random data, we need more than just this */
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l = curr_pid;
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RAND_add(&l, sizeof(l), 0.0);
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l = getuid();
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RAND_add(&l, sizeof(l), 0.0);
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l = time(NULL);
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RAND_add(&l, sizeof(l), 0.0);
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# if defined(DEVRANDOM) || (!defined(OPENSSL_NO_EGD) && defined(DEVRANDOM_EGD))
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return 1;
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# else
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return 0;
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# endif
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}
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# endif /* defined(__OpenBSD__) */
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#endif /* !(defined(OPENSSL_SYS_WINDOWS) ||
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* defined(OPENSSL_SYS_WIN32) ||
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* defined(OPENSSL_SYS_VMS) ||
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* defined(OPENSSL_SYS_VXWORKS) */
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#if defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI)
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int RAND_poll(void)
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{
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return 0;
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}
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#endif
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