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Diffstat (limited to 'thirdparty/openssl/crypto/rand/randfile.c')
| -rw-r--r-- | thirdparty/openssl/crypto/rand/randfile.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/thirdparty/openssl/crypto/rand/randfile.c b/thirdparty/openssl/crypto/rand/randfile.c new file mode 100644 index 0000000000..9537c56a78 --- /dev/null +++ b/thirdparty/openssl/crypto/rand/randfile.c @@ -0,0 +1,337 @@ +/* crypto/rand/randfile.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * 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.] + */ + +/* We need to define this to get macros like S_IFBLK and S_IFCHR */ +#if !defined(OPENSSL_SYS_VXWORKS) +# define _XOPEN_SOURCE 500 +#endif + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "e_os.h" +#include <openssl/crypto.h> +#include <openssl/rand.h> +#include <openssl/buffer.h> + +#ifdef OPENSSL_SYS_VMS +# include <unixio.h> +#endif +#ifndef NO_SYS_TYPES_H +# include <sys/types.h> +#endif +#ifndef OPENSSL_NO_POSIX_IO +# include <sys/stat.h> +# include <fcntl.h> +#endif + +#ifdef _WIN32 +# define stat _stat +# define chmod _chmod +# define open _open +# define fdopen _fdopen +#endif + +#undef BUFSIZE +#define BUFSIZE 1024 +#define RAND_DATA 1024 + +#ifdef OPENSSL_SYS_VMS +/* + * This declaration is a nasty hack to get around vms' extension to fopen for + * passing in sharing options being disabled by our /STANDARD=ANSI89 + */ +static FILE *(*const vms_fopen)(const char *, const char *, ...) = + (FILE *(*)(const char *, const char *, ...))fopen; +# define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0" +#endif + +/* #define RFILE ".rnd" - defined in ../../e_os.h */ + +/* + * Note that these functions are intended for seed files only. Entropy + * devices and EGD sockets are handled in rand_unix.c + */ + +int RAND_load_file(const char *file, long bytes) +{ + /*- + * If bytes >= 0, read up to 'bytes' bytes. + * if bytes == -1, read complete file. + */ + + MS_STATIC unsigned char buf[BUFSIZE]; +#ifndef OPENSSL_NO_POSIX_IO + struct stat sb; +#endif + int i, ret = 0, n; + FILE *in; + + if (file == NULL) + return (0); + +#ifndef OPENSSL_NO_POSIX_IO +# ifdef PURIFY + /* + * struct stat can have padding and unused fields that may not be + * initialized in the call to stat(). We need to clear the entire + * structure before calling RAND_add() to avoid complaints from + * applications such as Valgrind. + */ + memset(&sb, 0, sizeof(sb)); +# endif + if (stat(file, &sb) < 0) + return (0); + RAND_add(&sb, sizeof(sb), 0.0); +#endif + if (bytes == 0) + return (ret); + +#ifdef OPENSSL_SYS_VMS + in = vms_fopen(file, "rb", VMS_OPEN_ATTRS); +#else + in = fopen(file, "rb"); +#endif + if (in == NULL) + goto err; +#if defined(S_IFBLK) && defined(S_IFCHR) && !defined(OPENSSL_NO_POSIX_IO) + if (sb.st_mode & (S_IFBLK | S_IFCHR)) { + /* + * this file is a device. we don't want read an infinite number of + * bytes from a random device, nor do we want to use buffered I/O + * because we will waste system entropy. + */ + bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */ +# ifndef OPENSSL_NO_SETVBUF_IONBF + setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */ +# endif /* ndef OPENSSL_NO_SETVBUF_IONBF */ + } +#endif + for (;;) { + if (bytes > 0) + n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE; + else + n = BUFSIZE; + i = fread(buf, 1, n, in); + if (i <= 0) + break; +#ifdef PURIFY + RAND_add(buf, i, (double)i); +#else + /* even if n != i, use the full array */ + RAND_add(buf, n, (double)i); +#endif + ret += i; + if (bytes > 0) { + bytes -= n; + if (bytes <= 0) + break; + } + } + fclose(in); + OPENSSL_cleanse(buf, BUFSIZE); + err: + return (ret); +} + +int RAND_write_file(const char *file) +{ + unsigned char buf[BUFSIZE]; + int i, ret = 0, rand_err = 0; + FILE *out = NULL; + int n; +#ifndef OPENSSL_NO_POSIX_IO + struct stat sb; + + i = stat(file, &sb); + if (i != -1) { +# if defined(S_ISBLK) && defined(S_ISCHR) + if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) { + /* + * this file is a device. we don't write back to it. we + * "succeed" on the assumption this is some sort of random + * device. Otherwise attempting to write to and chmod the device + * causes problems. + */ + return (1); + } +# endif + } +#endif + +#if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && !defined(OPENSSL_SYS_VMS) + { +# ifndef O_BINARY +# define O_BINARY 0 +# endif + /* + * chmod(..., 0600) is too late to protect the file, permissions + * should be restrictive from the start + */ + int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600); + if (fd != -1) + out = fdopen(fd, "wb"); + } +#endif + +#ifdef OPENSSL_SYS_VMS + /* + * VMS NOTE: Prior versions of this routine created a _new_ version of + * the rand file for each call into this routine, then deleted all + * existing versions named ;-1, and finally renamed the current version + * as ';1'. Under concurrent usage, this resulted in an RMS race + * condition in rename() which could orphan files (see vms message help + * for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares + * the top-level version of the rand file. Note that there may still be + * conditions where the top-level rand file is locked. If so, this code + * will then create a new version of the rand file. Without the delete + * and rename code, this can result in ascending file versions that stop + * at version 32767, and this routine will then return an error. The + * remedy for this is to recode the calling application to avoid + * concurrent use of the rand file, or synchronize usage at the + * application level. Also consider whether or not you NEED a persistent + * rand file in a concurrent use situation. + */ + + out = vms_fopen(file, "rb+", VMS_OPEN_ATTRS); + if (out == NULL) + out = vms_fopen(file, "wb", VMS_OPEN_ATTRS); +#else + if (out == NULL) + out = fopen(file, "wb"); +#endif + if (out == NULL) + goto err; + +#ifndef NO_CHMOD + chmod(file, 0600); +#endif + n = RAND_DATA; + for (;;) { + i = (n > BUFSIZE) ? BUFSIZE : n; + n -= BUFSIZE; + if (RAND_bytes(buf, i) <= 0) + rand_err = 1; + i = fwrite(buf, 1, i, out); + if (i <= 0) { + ret = 0; + break; + } + ret += i; + if (n <= 0) + break; + } + + fclose(out); + OPENSSL_cleanse(buf, BUFSIZE); + err: + return (rand_err ? -1 : ret); +} + +const char *RAND_file_name(char *buf, size_t size) +{ + char *s = NULL; +#ifdef __OpenBSD__ + struct stat sb; +#endif + + if (OPENSSL_issetugid() == 0) + s = getenv("RANDFILE"); + if (s != NULL && *s && strlen(s) + 1 < size) { + if (BUF_strlcpy(buf, s, size) >= size) + return NULL; + } else { + if (OPENSSL_issetugid() == 0) + s = getenv("HOME"); +#ifdef DEFAULT_HOME + if (s == NULL) { + s = DEFAULT_HOME; + } +#endif + if (s && *s && strlen(s) + strlen(RFILE) + 2 < size) { + BUF_strlcpy(buf, s, size); +#ifndef OPENSSL_SYS_VMS + BUF_strlcat(buf, "/", size); +#endif + BUF_strlcat(buf, RFILE, size); + } else + buf[0] = '\0'; /* no file name */ + } + +#ifdef __OpenBSD__ + /* + * given that all random loads just fail if the file can't be seen on a + * stat, we stat the file we're returning, if it fails, use /dev/arandom + * instead. this allows the user to use their own source for good random + * data, but defaults to something hopefully decent if that isn't + * available. + */ + + if (!buf[0]) + if (BUF_strlcpy(buf, "/dev/arandom", size) >= size) { + return (NULL); + } + if (stat(buf, &sb) == -1) + if (BUF_strlcpy(buf, "/dev/arandom", size) >= size) { + return (NULL); + } +#endif + return (buf); +} |