155714Skris/* crypto/rand/randfile.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280297Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280297Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280297Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280297Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280297Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280297Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <errno.h> 6055714Skris#include <stdio.h> 6155714Skris#include <stdlib.h> 6255714Skris#include <string.h> 6355714Skris 64340704Sjkim#include "cryptlib.h" 65109998Smarkm#include "e_os.h" 66109998Smarkm#include <openssl/crypto.h> 67109998Smarkm#include <openssl/rand.h> 68127128Snectar#include <openssl/buffer.h> 69109998Smarkm 70109998Smarkm#ifdef OPENSSL_SYS_VMS 71280297Sjkim# include <unixio.h> 7259191Skris#endif 7359191Skris#ifndef NO_SYS_TYPES_H 7459191Skris# include <sys/types.h> 7559191Skris#endif 76238405Sjkim#ifndef OPENSSL_NO_POSIX_IO 7759191Skris# include <sys/stat.h> 78269682Sjkim# include <fcntl.h> 79306195Sjkim/* 80306195Sjkim * Following should not be needed, and we could have been stricter 81306195Sjkim * and demand S_IS*. But some systems just don't comply... Formally 82306195Sjkim * below macros are "anatomically incorrect", because normally they 83306195Sjkim * would look like ((m) & MASK == TYPE), but since MASK availability 84306195Sjkim * is as questionable, we settle for this poor-man fallback... 85306195Sjkim */ 86306195Sjkim# if !defined(S_ISBLK) 87306195Sjkim# if defined(_S_IFBLK) 88306195Sjkim# define S_ISBLK(m) ((m) & _S_IFBLK) 89306195Sjkim# elif defined(S_IFBLK) 90306195Sjkim# define S_ISBLK(m) ((m) & S_IFBLK) 91306195Sjkim# elif defined(_WIN32) 92306195Sjkim# define S_ISBLK(m) 0 /* no concept of block devices on Windows */ 93306195Sjkim# endif 94306195Sjkim# endif 95306195Sjkim# if !defined(S_ISCHR) 96306195Sjkim# if defined(_S_IFCHR) 97306195Sjkim# define S_ISCHR(m) ((m) & _S_IFCHR) 98306195Sjkim# elif defined(S_IFCHR) 99306195Sjkim# define S_ISCHR(m) ((m) & S_IFCHR) 100306195Sjkim# endif 101306195Sjkim# endif 10259191Skris#endif 10359191Skris 104194206Ssimon#ifdef _WIN32 105280297Sjkim# define stat _stat 106280297Sjkim# define chmod _chmod 107280297Sjkim# define open _open 108280297Sjkim# define fdopen _fdopen 109194206Ssimon#endif 110194206Ssimon 11155714Skris#undef BUFSIZE 112280297Sjkim#define BUFSIZE 1024 11355714Skris#define RAND_DATA 1024 11455714Skris 115306195Sjkim#if (defined(OPENSSL_SYS_VMS) && (defined(__alpha) || defined(__ia64))) 116280297Sjkim/* 117280297Sjkim * This declaration is a nasty hack to get around vms' extension to fopen for 118280297Sjkim * passing in sharing options being disabled by our /STANDARD=ANSI89 119280297Sjkim */ 120194206Ssimonstatic FILE *(*const vms_fopen)(const char *, const char *, ...) = 121194206Ssimon (FILE *(*)(const char *, const char *, ...))fopen; 122280297Sjkim# define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0" 123194206Ssimon#endif 124194206Ssimon 12559191Skris/* #define RFILE ".rnd" - defined in ../../e_os.h */ 12655714Skris 127280297Sjkim/* 128280297Sjkim * Note that these functions are intended for seed files only. Entropy 129280297Sjkim * devices and EGD sockets are handled in rand_unix.c 130280297Sjkim */ 13172613Skris 13255714Skrisint RAND_load_file(const char *file, long bytes) 133280297Sjkim{ 134280297Sjkim /*- 135280297Sjkim * If bytes >= 0, read up to 'bytes' bytes. 136280297Sjkim * if bytes == -1, read complete file. 137280297Sjkim */ 13859191Skris 139280297Sjkim MS_STATIC unsigned char buf[BUFSIZE]; 140238405Sjkim#ifndef OPENSSL_NO_POSIX_IO 141280297Sjkim struct stat sb; 142238405Sjkim#endif 143280297Sjkim int i, ret = 0, n; 144306195Sjkim/* 145306195Sjkim * If setvbuf() is to be called, then the FILE pointer 146306195Sjkim * to it must be 32 bit. 147306195Sjkim*/ 148306195Sjkim 149306195Sjkim#if !defined OPENSSL_NO_SETVBUF_IONBF && defined(OPENSSL_SYS_VMS) && defined(__VMS_VER) && (__VMS_VER >= 70000000) 150306195Sjkim /* For 64-bit-->32 bit API Support*/ 151306195Sjkim#if __INITIAL_POINTER_SIZE == 64 152306195Sjkim#pragma __required_pointer_size __save 153306195Sjkim#pragma __required_pointer_size 32 154306195Sjkim#endif 155306195Sjkim FILE *in; /* setvbuf() requires 32-bit pointers */ 156306195Sjkim#if __INITIAL_POINTER_SIZE == 64 157306195Sjkim#pragma __required_pointer_size __restore 158306195Sjkim#endif 159306195Sjkim#else 160280297Sjkim FILE *in; 161306195Sjkim#endif /* OPENSSL_SYS_VMS */ 16255714Skris 163280297Sjkim if (file == NULL) 164280297Sjkim return (0); 16555714Skris 166238405Sjkim#ifndef OPENSSL_NO_POSIX_IO 167280297Sjkim# ifdef PURIFY 168280297Sjkim /* 169280297Sjkim * struct stat can have padding and unused fields that may not be 170280297Sjkim * initialized in the call to stat(). We need to clear the entire 171280297Sjkim * structure before calling RAND_add() to avoid complaints from 172280297Sjkim * applications such as Valgrind. 173280297Sjkim */ 174280297Sjkim memset(&sb, 0, sizeof(sb)); 175280297Sjkim# endif 176280297Sjkim if (stat(file, &sb) < 0) 177280297Sjkim return (0); 178280297Sjkim RAND_add(&sb, sizeof(sb), 0.0); 179205128Ssimon#endif 180280297Sjkim if (bytes == 0) 181280297Sjkim return (ret); 18255714Skris 183194206Ssimon#ifdef OPENSSL_SYS_VMS 184280297Sjkim in = vms_fopen(file, "rb", VMS_OPEN_ATTRS); 185194206Ssimon#else 186280297Sjkim in = fopen(file, "rb"); 187194206Ssimon#endif 188280297Sjkim if (in == NULL) 189280297Sjkim goto err; 190306195Sjkim#if defined(S_ISBLK) && defined(S_ISCHR) && !defined(OPENSSL_NO_POSIX_IO) 191306195Sjkim if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) { 192280297Sjkim /* 193280297Sjkim * this file is a device. we don't want read an infinite number of 194280297Sjkim * bytes from a random device, nor do we want to use buffered I/O 195280297Sjkim * because we will waste system entropy. 196280297Sjkim */ 197280297Sjkim bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */ 198280297Sjkim# ifndef OPENSSL_NO_SETVBUF_IONBF 199280297Sjkim setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */ 200280297Sjkim# endif /* ndef OPENSSL_NO_SETVBUF_IONBF */ 201280297Sjkim } 202127128Snectar#endif 203280297Sjkim for (;;) { 204280297Sjkim if (bytes > 0) 205280297Sjkim n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE; 206280297Sjkim else 207280297Sjkim n = BUFSIZE; 208280297Sjkim i = fread(buf, 1, n, in); 209280297Sjkim if (i <= 0) 210280297Sjkim break; 211194206Ssimon#ifdef PURIFY 212280297Sjkim RAND_add(buf, i, (double)i); 213194206Ssimon#else 214280297Sjkim /* even if n != i, use the full array */ 215280297Sjkim RAND_add(buf, n, (double)i); 216194206Ssimon#endif 217280297Sjkim ret += i; 218280297Sjkim if (bytes > 0) { 219280297Sjkim bytes -= n; 220280297Sjkim if (bytes <= 0) 221280297Sjkim break; 222280297Sjkim } 223280297Sjkim } 224280297Sjkim fclose(in); 225280297Sjkim OPENSSL_cleanse(buf, BUFSIZE); 226280297Sjkim err: 227280297Sjkim return (ret); 228280297Sjkim} 22955714Skris 23055714Skrisint RAND_write_file(const char *file) 231280297Sjkim{ 232280297Sjkim unsigned char buf[BUFSIZE]; 233280297Sjkim int i, ret = 0, rand_err = 0; 234280297Sjkim FILE *out = NULL; 235280297Sjkim int n; 236238405Sjkim#ifndef OPENSSL_NO_POSIX_IO 237280297Sjkim struct stat sb; 238280297Sjkim 239280297Sjkim i = stat(file, &sb); 240280297Sjkim if (i != -1) { 241280297Sjkim# if defined(S_ISBLK) && defined(S_ISCHR) 242280297Sjkim if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) { 243280297Sjkim /* 244280297Sjkim * this file is a device. we don't write back to it. we 245280297Sjkim * "succeed" on the assumption this is some sort of random 246280297Sjkim * device. Otherwise attempting to write to and chmod the device 247280297Sjkim * causes problems. 248280297Sjkim */ 249280297Sjkim return (1); 250280297Sjkim } 251280297Sjkim# endif 252280297Sjkim } 253127128Snectar#endif 254127128Snectar 255238405Sjkim#if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && !defined(OPENSSL_SYS_VMS) 256280297Sjkim { 257280297Sjkim# ifndef O_BINARY 258280297Sjkim# define O_BINARY 0 259280297Sjkim# endif 260280297Sjkim /* 261280297Sjkim * chmod(..., 0600) is too late to protect the file, permissions 262280297Sjkim * should be restrictive from the start 263280297Sjkim */ 264280297Sjkim int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600); 265280297Sjkim if (fd != -1) 266280297Sjkim out = fdopen(fd, "wb"); 267280297Sjkim } 268238405Sjkim#endif 269194206Ssimon 270306195Sjkim#if (defined(OPENSSL_SYS_VMS) && (defined(__alpha) || defined(__ia64))) 271280297Sjkim /* 272280297Sjkim * VMS NOTE: Prior versions of this routine created a _new_ version of 273280297Sjkim * the rand file for each call into this routine, then deleted all 274280297Sjkim * existing versions named ;-1, and finally renamed the current version 275280297Sjkim * as ';1'. Under concurrent usage, this resulted in an RMS race 276280297Sjkim * condition in rename() which could orphan files (see vms message help 277280297Sjkim * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares 278280297Sjkim * the top-level version of the rand file. Note that there may still be 279280297Sjkim * conditions where the top-level rand file is locked. If so, this code 280280297Sjkim * will then create a new version of the rand file. Without the delete 281280297Sjkim * and rename code, this can result in ascending file versions that stop 282280297Sjkim * at version 32767, and this routine will then return an error. The 283280297Sjkim * remedy for this is to recode the calling application to avoid 284280297Sjkim * concurrent use of the rand file, or synchronize usage at the 285280297Sjkim * application level. Also consider whether or not you NEED a persistent 286280297Sjkim * rand file in a concurrent use situation. 287280297Sjkim */ 288194206Ssimon 289280297Sjkim out = vms_fopen(file, "rb+", VMS_OPEN_ATTRS); 290280297Sjkim if (out == NULL) 291280297Sjkim out = vms_fopen(file, "wb", VMS_OPEN_ATTRS); 292194206Ssimon#else 293280297Sjkim if (out == NULL) 294280297Sjkim out = fopen(file, "wb"); 295194206Ssimon#endif 296280297Sjkim if (out == NULL) 297280297Sjkim goto err; 29859191Skris 29959191Skris#ifndef NO_CHMOD 300280297Sjkim chmod(file, 0600); 30159191Skris#endif 302280297Sjkim n = RAND_DATA; 303280297Sjkim for (;;) { 304280297Sjkim i = (n > BUFSIZE) ? BUFSIZE : n; 305280297Sjkim n -= BUFSIZE; 306280297Sjkim if (RAND_bytes(buf, i) <= 0) 307280297Sjkim rand_err = 1; 308280297Sjkim i = fwrite(buf, 1, i, out); 309280297Sjkim if (i <= 0) { 310280297Sjkim ret = 0; 311280297Sjkim break; 312280297Sjkim } 313280297Sjkim ret += i; 314280297Sjkim if (n <= 0) 315280297Sjkim break; 316280297Sjkim } 31759191Skris 318280297Sjkim fclose(out); 319280297Sjkim OPENSSL_cleanse(buf, BUFSIZE); 320280297Sjkim err: 321280297Sjkim return (rand_err ? -1 : ret); 322280297Sjkim} 32355714Skris 32476866Skrisconst char *RAND_file_name(char *buf, size_t size) 325280297Sjkim{ 326280297Sjkim char *s = NULL; 327215697Ssimon#ifdef __OpenBSD__ 328280297Sjkim struct stat sb; 329127128Snectar#endif 33055714Skris 331340704Sjkim s = ossl_safe_getenv("RANDFILE"); 332280297Sjkim if (s != NULL && *s && strlen(s) + 1 < size) { 333280297Sjkim if (BUF_strlcpy(buf, s, size) >= size) 334280297Sjkim return NULL; 335280297Sjkim } else { 336340704Sjkim s = ossl_safe_getenv("HOME"); 33779998Skris#ifdef DEFAULT_HOME 338280297Sjkim if (s == NULL) { 339280297Sjkim s = DEFAULT_HOME; 340280297Sjkim } 34179998Skris#endif 342280297Sjkim if (s && *s && strlen(s) + strlen(RFILE) + 2 < size) { 343280297Sjkim BUF_strlcpy(buf, s, size); 344109998Smarkm#ifndef OPENSSL_SYS_VMS 345280297Sjkim BUF_strlcat(buf, "/", size); 34655714Skris#endif 347280297Sjkim BUF_strlcat(buf, RFILE, size); 348280297Sjkim } else 349280297Sjkim buf[0] = '\0'; /* no file name */ 350280297Sjkim } 351127128Snectar 352127128Snectar#ifdef __OpenBSD__ 353280297Sjkim /* 354280297Sjkim * given that all random loads just fail if the file can't be seen on a 355280297Sjkim * stat, we stat the file we're returning, if it fails, use /dev/arandom 356280297Sjkim * instead. this allows the user to use their own source for good random 357280297Sjkim * data, but defaults to something hopefully decent if that isn't 358280297Sjkim * available. 359280297Sjkim */ 360127128Snectar 361280297Sjkim if (!buf[0]) 362280297Sjkim if (BUF_strlcpy(buf, "/dev/arandom", size) >= size) { 363280297Sjkim return (NULL); 364280297Sjkim } 365280297Sjkim if (stat(buf, &sb) == -1) 366280297Sjkim if (BUF_strlcpy(buf, "/dev/arandom", size) >= size) { 367280297Sjkim return (NULL); 368280297Sjkim } 369127128Snectar#endif 370280297Sjkim return (buf); 371280297Sjkim} 372