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337 lines
11 KiB
337 lines
11 KiB
/* crypto/rand/randfile.c */ |
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] |
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*/ |
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/* We need to define this to get macros like S_IFBLK and S_IFCHR */ |
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#if !defined(OPENSSL_SYS_VXWORKS) |
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# define _XOPEN_SOURCE 500 |
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#endif |
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#include <errno.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "e_os.h" |
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#include <openssl/crypto.h> |
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#include <openssl/rand.h> |
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#include <openssl/buffer.h> |
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#ifdef OPENSSL_SYS_VMS |
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# include <unixio.h> |
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#endif |
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#ifndef NO_SYS_TYPES_H |
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# include <sys/types.h> |
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#endif |
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#ifndef OPENSSL_NO_POSIX_IO |
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# include <sys/stat.h> |
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# include <fcntl.h> |
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#endif |
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#ifdef _WIN32 |
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# define stat _stat |
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# define chmod _chmod |
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# define open _open |
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# define fdopen _fdopen |
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#endif |
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#undef BUFSIZE |
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#define BUFSIZE 1024 |
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#define RAND_DATA 1024 |
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#ifdef OPENSSL_SYS_VMS |
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/* |
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* This declaration is a nasty hack to get around vms' extension to fopen for |
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* passing in sharing options being disabled by our /STANDARD=ANSI89 |
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*/ |
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static FILE *(*const vms_fopen)(const char *, const char *, ...) = |
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(FILE *(*)(const char *, const char *, ...))fopen; |
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# define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0" |
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#endif |
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/* #define RFILE ".rnd" - defined in ../../e_os.h */ |
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/* |
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* Note that these functions are intended for seed files only. Entropy |
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* devices and EGD sockets are handled in rand_unix.c |
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*/ |
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int RAND_load_file(const char *file, long bytes) |
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{ |
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/*- |
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* If bytes >= 0, read up to 'bytes' bytes. |
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* if bytes == -1, read complete file. |
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*/ |
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MS_STATIC unsigned char buf[BUFSIZE]; |
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#ifndef OPENSSL_NO_POSIX_IO |
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struct stat sb; |
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#endif |
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int i, ret = 0, n; |
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FILE *in; |
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if (file == NULL) |
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return (0); |
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#ifndef OPENSSL_NO_POSIX_IO |
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# ifdef PURIFY |
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/* |
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* struct stat can have padding and unused fields that may not be |
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* initialized in the call to stat(). We need to clear the entire |
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* structure before calling RAND_add() to avoid complaints from |
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* applications such as Valgrind. |
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*/ |
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memset(&sb, 0, sizeof(sb)); |
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# endif |
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if (stat(file, &sb) < 0) |
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return (0); |
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RAND_add(&sb, sizeof(sb), 0.0); |
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#endif |
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if (bytes == 0) |
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return (ret); |
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#ifdef OPENSSL_SYS_VMS |
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in = vms_fopen(file, "rb", VMS_OPEN_ATTRS); |
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#else |
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in = fopen(file, "rb"); |
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#endif |
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if (in == NULL) |
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goto err; |
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#if defined(S_IFBLK) && defined(S_IFCHR) && !defined(OPENSSL_NO_POSIX_IO) |
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if (sb.st_mode & (S_IFBLK | S_IFCHR)) { |
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/* |
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* this file is a device. we don't want read an infinite number of |
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* bytes from a random device, nor do we want to use buffered I/O |
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* because we will waste system entropy. |
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*/ |
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bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */ |
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# ifndef OPENSSL_NO_SETVBUF_IONBF |
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setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */ |
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# endif /* ndef OPENSSL_NO_SETVBUF_IONBF */ |
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} |
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#endif |
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for (;;) { |
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if (bytes > 0) |
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n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE; |
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else |
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n = BUFSIZE; |
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i = fread(buf, 1, n, in); |
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if (i <= 0) |
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break; |
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#ifdef PURIFY |
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RAND_add(buf, i, (double)i); |
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#else |
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/* even if n != i, use the full array */ |
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RAND_add(buf, n, (double)i); |
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#endif |
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ret += i; |
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if (bytes > 0) { |
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bytes -= n; |
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if (bytes <= 0) |
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break; |
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} |
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} |
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fclose(in); |
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OPENSSL_cleanse(buf, BUFSIZE); |
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err: |
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return (ret); |
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} |
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int RAND_write_file(const char *file) |
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{ |
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unsigned char buf[BUFSIZE]; |
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int i, ret = 0, rand_err = 0; |
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FILE *out = NULL; |
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int n; |
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#ifndef OPENSSL_NO_POSIX_IO |
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struct stat sb; |
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i = stat(file, &sb); |
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if (i != -1) { |
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# if defined(S_ISBLK) && defined(S_ISCHR) |
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if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) { |
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/* |
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* this file is a device. we don't write back to it. we |
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* "succeed" on the assumption this is some sort of random |
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* device. Otherwise attempting to write to and chmod the device |
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* causes problems. |
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*/ |
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return (1); |
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} |
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# endif |
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} |
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#endif |
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#if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && !defined(OPENSSL_SYS_VMS) |
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{ |
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# ifndef O_BINARY |
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# define O_BINARY 0 |
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# endif |
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/* |
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* chmod(..., 0600) is too late to protect the file, permissions |
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* should be restrictive from the start |
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*/ |
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int fd = open(file, O_WRONLY | O_CREAT | O_BINARY, 0600); |
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if (fd != -1) |
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out = fdopen(fd, "wb"); |
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} |
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#endif |
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#ifdef OPENSSL_SYS_VMS |
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/* |
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* VMS NOTE: Prior versions of this routine created a _new_ version of |
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* the rand file for each call into this routine, then deleted all |
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* existing versions named ;-1, and finally renamed the current version |
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* as ';1'. Under concurrent usage, this resulted in an RMS race |
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* condition in rename() which could orphan files (see vms message help |
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* for RMS$_REENT). With the fopen() calls below, openssl/VMS now shares |
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* the top-level version of the rand file. Note that there may still be |
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* conditions where the top-level rand file is locked. If so, this code |
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* will then create a new version of the rand file. Without the delete |
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* and rename code, this can result in ascending file versions that stop |
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* at version 32767, and this routine will then return an error. The |
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* remedy for this is to recode the calling application to avoid |
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* concurrent use of the rand file, or synchronize usage at the |
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* application level. Also consider whether or not you NEED a persistent |
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* rand file in a concurrent use situation. |
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*/ |
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out = vms_fopen(file, "rb+", VMS_OPEN_ATTRS); |
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if (out == NULL) |
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out = vms_fopen(file, "wb", VMS_OPEN_ATTRS); |
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#else |
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if (out == NULL) |
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out = fopen(file, "wb"); |
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#endif |
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if (out == NULL) |
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goto err; |
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#ifndef NO_CHMOD |
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chmod(file, 0600); |
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#endif |
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n = RAND_DATA; |
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for (;;) { |
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i = (n > BUFSIZE) ? BUFSIZE : n; |
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n -= BUFSIZE; |
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if (RAND_bytes(buf, i) <= 0) |
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rand_err = 1; |
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i = fwrite(buf, 1, i, out); |
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if (i <= 0) { |
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ret = 0; |
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break; |
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} |
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ret += i; |
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if (n <= 0) |
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break; |
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} |
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fclose(out); |
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OPENSSL_cleanse(buf, BUFSIZE); |
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err: |
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return (rand_err ? -1 : ret); |
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} |
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const char *RAND_file_name(char *buf, size_t size) |
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{ |
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char *s = NULL; |
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#ifdef __OpenBSD__ |
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struct stat sb; |
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#endif |
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if (OPENSSL_issetugid() == 0) |
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s = getenv("RANDFILE"); |
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if (s != NULL && *s && strlen(s) + 1 < size) { |
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if (BUF_strlcpy(buf, s, size) >= size) |
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return NULL; |
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} else { |
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if (OPENSSL_issetugid() == 0) |
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s = getenv("HOME"); |
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#ifdef DEFAULT_HOME |
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if (s == NULL) { |
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s = DEFAULT_HOME; |
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} |
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#endif |
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if (s && *s && strlen(s) + strlen(RFILE) + 2 < size) { |
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BUF_strlcpy(buf, s, size); |
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#ifndef OPENSSL_SYS_VMS |
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BUF_strlcat(buf, "/", size); |
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#endif |
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BUF_strlcat(buf, RFILE, size); |
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} else |
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buf[0] = '\0'; /* no file name */ |
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} |
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#ifdef __OpenBSD__ |
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/* |
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* given that all random loads just fail if the file can't be seen on a |
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* stat, we stat the file we're returning, if it fails, use /dev/arandom |
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* instead. this allows the user to use their own source for good random |
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* data, but defaults to something hopefully decent if that isn't |
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* available. |
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*/ |
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if (!buf[0]) |
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if (BUF_strlcpy(buf, "/dev/arandom", size) >= size) { |
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return (NULL); |
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} |
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if (stat(buf, &sb) == -1) |
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if (BUF_strlcpy(buf, "/dev/arandom", size) >= size) { |
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return (NULL); |
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} |
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#endif |
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return (buf); |
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}
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