X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Frand%2Frand_unix.c;h=f5a59cb28a66879a44c706b5216fa3d74dcd2a2f;hp=8b4c483312967a3ec6f476ac2f8f344d75c17335;hb=c16de9d8329d41a2433d0f273c080d9d06ad7a87;hpb=4d8743f490a5f96fa26d41985ee12cb6b9815a4c diff --git a/crypto/rand/rand_unix.c b/crypto/rand/rand_unix.c index 8b4c483312..f5a59cb28a 100644 --- a/crypto/rand/rand_unix.c +++ b/crypto/rand/rand_unix.c @@ -1,246 +1,252 @@ -/* crypto/rand/rand_unix.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. +/* + * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved. * - * This package is an SSL implementation written - * by Eric Young (eay@cryptsoft.com). - * The implementation was written so as to conform with Netscapes SSL. - * - * This library is free for commercial and non-commercial use as long as - * the following conditions are aheared to. The following conditions - * apply to all code found in this distribution, be it the RC4, RSA, - * lhash, DES, etc., code; not just the SSL code. The SSL documentation - * included with this distribution is covered by the same copyright terms - * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * - * Copyright remains Eric Young's, and as such any Copyright notices in - * the code are not to be removed. - * If this package is used in a product, Eric Young should be given attribution - * as the author of the parts of the library used. - * This can be in the form of a textual message at program startup or - * in documentation (online or textual) provided with the package. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * "This product includes cryptographic software written by - * Eric Young (eay@cryptsoft.com)" - * The word 'cryptographic' can be left out if the rouines from the library - * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from - * the apps directory (application code) you must include an acknowledgement: - * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * - * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * The licence and distribution terms for any publically available version or - * derivative of this code cannot be changed. i.e. this code cannot simply be - * copied and put under another distribution licence - * [including the GNU Public Licence.] + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ -/* ==================================================================== - * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - * 3. All advertising materials mentioning features or use of this - * software must display the following acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" - * - * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to - * endorse or promote products derived from this software without - * prior written permission. For written permission, please contact - * openssl-core@openssl.org. - * - * 5. Products derived from this software may not be called "OpenSSL" - * nor may "OpenSSL" appear in their names without prior written - * permission of the OpenSSL Project. - * - * 6. Redistributions of any form whatsoever must retain the following - * acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit (http://www.openssl.org/)" - * - * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY - * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR - * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, - * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED - * OF THE POSSIBILITY OF SUCH DAMAGE. - * ==================================================================== - * - * This product includes cryptographic software written by Eric Young - * (eay@cryptsoft.com). This product includes software written by Tim - * Hudson (tjh@cryptsoft.com). - * - */ -#include -#define USE_SOCKETS #include "e_os.h" -#include "cryptlib.h" +#include +#include "internal/cryptlib.h" #include #include "rand_lcl.h" +#include -#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)) - -#include -#include -#include -#include -#include -#include - -int RAND_poll(void) -{ - unsigned long l; - pid_t curr_pid = getpid(); -#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) - unsigned char tmpbuf[ENTROPY_NEEDED]; - int n = 0; -#endif -#ifdef DEVRANDOM - static const char *randomfiles[] = { DEVRANDOM, NULL }; - const char **randomfile = NULL; - int fd; -#endif -#ifdef DEVRANDOM_EGD - static const char *egdsockets[] = { DEVRANDOM_EGD, NULL }; - const char **egdsocket = NULL; +#ifdef OPENSSL_RAND_SEED_GETRANDOM +# include #endif -#ifdef DEVRANDOM - /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD - * have this. Use /dev/urandom if you can as /dev/random may block - * if it runs out of random entries. */ - - for (randomfile = randomfiles; *randomfile && n < ENTROPY_NEEDED; randomfile++) - { - if ((fd = open(*randomfile, O_RDONLY|O_NONBLOCK -#ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it - our controlling tty */ - |O_NOCTTY -#endif -#ifdef O_NOFOLLOW /* Fail if the file is a symbolic link */ - |O_NOFOLLOW -#endif - )) >= 0) - { - struct timeval t = { 0, 10*1000 }; /* Spend 10ms on - each file. */ - int r; - fd_set fset; - - do - { - FD_ZERO(&fset); - FD_SET(fd, &fset); - r = -1; - - if (select(fd+1,&fset,NULL,NULL,&t) < 0) - t.tv_usec=0; - else if (FD_ISSET(fd, &fset)) - { - r=read(fd,(unsigned char *)tmpbuf+n, - ENTROPY_NEEDED-n); - if (r > 0) - n += r; - } - - /* Some Unixen will update t, some - won't. For those who won't, give - up here, otherwise, we will do - this once again for the remaining - time. */ - if (t.tv_usec == 10*1000) - t.tv_usec=0; - } - while ((r > 0 || (errno == EINTR || errno == EAGAIN)) - && t.tv_usec != 0 && n < ENTROPY_NEEDED); - - close(fd); - } - } +#if (defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI)) && \ + !defined(OPENSSL_RAND_SEED_NONE) +# error "UEFI and VXWorks only support seeding NONE" #endif -#ifdef DEVRANDOM_EGD - /* Use an EGD socket to read entropy from an EGD or PRNGD entropy - * collecting daemon. */ - - for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++) - { - int r; - - r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n, - ENTROPY_NEEDED-n); - if (r > 0) - n += r; - } -#endif +#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) \ + || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_VXWORKS) \ + || defined(OPENSSL_SYS_UEFI)) + +# if defined(OPENSSL_SYS_VOS) + +# ifndef OPENSSL_RAND_SEED_OS +# error "Unsupported seeding method configured; must be os" +# endif + +# if defined(OPENSSL_SYS_VOS_HPPA) && defined(OPENSSL_SYS_VOS_IA32) +# error "Unsupported HP-PA and IA32 at the same time." +# endif +# if !defined(OPENSSL_SYS_VOS_HPPA) && !defined(OPENSSL_SYS_VOS_IA32) +# error "Must have one of HP-PA or IA32" +# endif + +/* + * The following algorithm repeatedly samples the real-time clock (RTC) to + * generate a sequence of unpredictable data. The algorithm relies upon the + * uneven execution speed of the code (due to factors such as cache misses, + * interrupts, bus activity, and scheduling) and upon the rather large + * relative difference between the speed of the clock and the rate at which + * it can be read. If it is ported to an environment where execution speed + * is more constant or where the RTC ticks at a much slower rate, or the + * clock can be read with fewer instructions, it is likely that the results + * would be far more predictable. This should only be used for legacy + * platforms. + * + * As a precaution, we assume only 2 bits of entropy per byte. + */ +size_t RAND_POOL_acquire_entropy(RAND_POOL *pool) +{ + short int code; + gid_t curr_gid; + pid_t curr_pid; + uid_t curr_uid; + int i, k; + size_t bytes_needed; + struct timespec ts; + unsigned char v; +# ifdef OPENSSL_SYS_VOS_HPPA + long duration; + extern void s$sleep(long *_duration, short int *_code); +# else + long long duration; + extern void s$sleep2(long long *_duration, short int *_code); +# endif + + /* + * Seed with the gid, pid, and uid, to ensure *some* variation between + * different processes. + */ + curr_gid = getgid(); + RAND_POOL_add(pool, &curr_gid, sizeof(curr_gid), 0); + curr_pid = getpid(); + RAND_POOL_add(pool, &curr_pid, sizeof(curr_pid), 0); + curr_uid = getuid(); + RAND_POOL_add(pool, &curr_uid, sizeof(curr_uid), 0); + + bytes_needed = RAND_POOL_bytes_needed(pool, 2 /*entropy_per_byte*/); + + for (i = 0; i < bytes_needed; i++) { + /* + * burn some cpu; hope for interrupts, cache collisions, bus + * interference, etc. + */ + for (k = 0; k < 99; k++) + ts.tv_nsec = random(); + +# ifdef OPENSSL_SYS_VOS_HPPA + /* sleep for 1/1024 of a second (976 us). */ + duration = 1; + s$sleep(&duration, &code); +# else + /* sleep for 1/65536 of a second (15 us). */ + duration = 1; + s$sleep2(&duration, &code); +# endif + + /* Get wall clock time, take 8 bits. */ + clock_gettime(CLOCK_REALTIME, &ts); + v = (unsigned char)(ts.tv_nsec & 0xFF); + RAND_POOL_add(pool, arg, &v, sizeof(v) , 2); + } + return RAND_POOL_entropy_available(pool); +} -#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) - if (n > 0) - { - RAND_add(tmpbuf,sizeof tmpbuf,n); - OPENSSL_cleanse(tmpbuf,n); - } -#endif +# else - /* put in some default random data, we need more than just this */ - l=curr_pid; - RAND_add(&l,sizeof(l),0); - l=getuid(); - RAND_add(&l,sizeof(l),0); +# if defined(OPENSSL_RAND_SEED_EGD) && \ + (defined(OPENSSL_NO_EGD) || !defined(DEVRANDOM_EGD)) +# error "Seeding uses EGD but EGD is turned off or no device given" +# endif - l=time(NULL); - RAND_add(&l,sizeof(l),0); +# if defined(OPENSSL_RAND_SEED_DEVRANDOM) && !defined(DEVRANDOM) +# error "Seeding uses urandom but DEVRANDOM is not configured" +# endif -#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) - return 1; -#else - return 0; -#endif -} +# if defined(OPENSSL_RAND_SEED_OS) +# if defined(DEVRANDOM) +# define OPENSSL_RAND_SEED_DEVRANDOM +# else +# error "OS seeding requires DEVRANDOM to be configured" +# endif +# endif -#endif +# if defined(OPENSSL_RAND_SEED_LIBRANDOM) +# error "librandom not (yet) supported" +# endif -#if defined(OPENSSL_SYS_VXWORKS) -int RAND_poll(void) +/* + * Try the various seeding methods in turn, exit when successful. + * + * TODO(DRBG): If more than one entropy source is available, is it + * preferable to stop as soon as enough entropy has been collected + * (as favored by @rsalz) or should one rather be defensive and add + * more entropy than requested and/or from different sources? + * + * Currently, the user can select multiple entropy sources in the + * configure step, yet in practice only the first available source + * will be used. A more flexible solution has been requested, but + * currently it is not clear how this can be achieved without + * overengineering the problem. There are many parameters which + * could be taken into account when selecting the order and amount + * of input from the different entropy sources (trust, quality, + * possibility of blocking). + */ +size_t RAND_POOL_acquire_entropy(RAND_POOL *pool) { - return 0; +# ifdef OPENSSL_RAND_SEED_NONE + return RAND_POOL_entropy_available(pool); +# else + size_t bytes_needed; + size_t entropy_available = 0; + unsigned char *buffer; + +# ifdef OPENSSL_RAND_SEED_GETRANDOM + bytes_needed = RAND_POOL_bytes_needed(pool, 8 /*entropy_per_byte*/); + buffer = RAND_POOL_add_begin(pool, bytes_needed); + if (buffer != NULL) { + size_t bytes = 0; + + if (getrandom(buffer, bytes_needed, 0) == (int)bytes_needed) + bytes = bytes_needed; + + entropy_available = RAND_POOL_add_end(pool, bytes, 8 * bytes); + } + if (entropy_available > 0) + return entropy_available; +# endif + +# if defined(OPENSSL_RAND_SEED_LIBRANDOM) + { + /* Not yet implemented. */ + } +# endif + +# ifdef OPENSSL_RAND_SEED_DEVRANDOM + bytes_needed = RAND_POOL_bytes_needed(pool, 8 /*entropy_per_byte*/); + if (bytes_needed > 0) { + static const char *paths[] = { DEVRANDOM, NULL }; + FILE *fp; + int i; + + for (i = 0; paths[i] != NULL; i++) { + if ((fp = fopen(paths[i], "rb")) == NULL) + continue; + setbuf(fp, NULL); + buffer = RAND_POOL_add_begin(pool, bytes_needed); + if (buffer != NULL) { + size_t bytes = 0; + if (fread(buffer, 1, bytes_needed, fp) == bytes_needed) + bytes = bytes_needed; + + entropy_available = RAND_POOL_add_end(pool, bytes, 8 * bytes); + } + fclose(fp); + if (entropy_available > 0) + return entropy_available; + + bytes_needed = RAND_POOL_bytes_needed(pool, 8 /*entropy_per_byte*/); + } + } +# endif + +# ifdef OPENSSL_RAND_SEED_RDTSC + entropy_available = rand_acquire_entropy_from_tsc(pool); + if (entropy_available > 0) + return entropy_available; +# endif + +# ifdef OPENSSL_RAND_SEED_RDCPU + entropy_available = rand_acquire_entropy_from_cpu(pool); + if (entropy_available > 0) + return entropy_available; +# endif + +# ifdef OPENSSL_RAND_SEED_EGD + bytes_needed = RAND_POOL_bytes_needed(pool, 8 /*entropy_per_byte*/); + if (bytes_needed > 0) { + static const char *paths[] = { DEVRANDOM_EGD, NULL }; + int i; + + for (i = 0; paths[i] != NULL; i++) { + buffer = RAND_POOL_add_begin(pool, bytes_needed); + if (buffer != NULL) { + size_t bytes = 0; + int num = RAND_query_egd_bytes(paths[i], + buffer, (int)bytes_needed); + if (num == (int)bytes_needed) + bytes = bytes_needed; + + entropy_available = RAND_POOL_add_end(pool, bytes, 8 * bytes); + } + if (entropy_available > 0) + return entropy_available; + } + } +# endif + + return RAND_POOL_entropy_available(pool); +# endif } +# endif + #endif