X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Frand%2Frandfile.c;h=19cce2c7a83674732d874486ba7bdd9ffdb3fed1;hp=41574768ab762a32c6ec32d1f3a55c0e0968745f;hb=13c03c8d6da334bb1cde6ce4133e7c75b3b76947;hpb=4579924b7e55fccc7013e6de196f2e2ab175ce39 diff --git a/crypto/rand/randfile.c b/crypto/rand/randfile.c index 41574768ab..19cce2c7a8 100644 --- a/crypto/rand/randfile.c +++ b/crypto/rand/randfile.c @@ -1,234 +1,339 @@ -/* crypto/rand/randfile.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. +/* + * Copyright 1995-2016 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 */ +#include "e_os.h" + #include #include #include #include -#include "e_os.h" #include #include +#include #ifdef OPENSSL_SYS_VMS -#include +# include #endif #ifndef NO_SYS_TYPES_H # include #endif -#ifdef MAC_OS_pre_X -# include -#else +#ifndef OPENSSL_NO_POSIX_IO # include +# include +/* + * Following should not be needed, and we could have been stricter + * and demand S_IS*. But some systems just don't comply... Formally + * below macros are "anatomically incorrect", because normally they + * would look like ((m) & MASK == TYPE), but since MASK availability + * is as questionable, we settle for this poor-man fallback... + */ +# if !defined(S_ISBLK) +# if defined(_S_IFBLK) +# define S_ISBLK(m) ((m) & _S_IFBLK) +# elif defined(S_IFBLK) +# define S_ISBLK(m) ((m) & S_IFBLK) +# elif defined(_WIN32) +# define S_ISBLK(m) 0 /* no concept of block devices on Windows */ +# endif +# endif +# if !defined(S_ISCHR) +# if defined(_S_IFCHR) +# define S_ISCHR(m) ((m) & _S_IFCHR) +# elif defined(S_IFCHR) +# define S_ISCHR(m) ((m) & S_IFCHR) +# endif +# endif +#endif + +#ifdef _WIN32 +# define stat _stat +# define chmod _chmod +# define open _open +# define fdopen _fdopen #endif #undef BUFSIZE -#define BUFSIZE 1024 +#define BUFSIZE 1024 #define RAND_DATA 1024 -/* #define RFILE ".rnd" - defined in ../../e_os.h */ +#ifdef OPENSSL_SYS_VMS +/* + * Misc hacks needed for specific cases. + * + * __FILE_ptr32 is a type provided by DEC C headers (types.h specifically) + * to make sure the FILE* is a 32-bit pointer no matter what. We know that + * stdio function return this type (a study of stdio.h proves it). + * Additionally, we create a similar char pointer type for the sake of + * vms_setbuf below. + */ +# if __INITIAL_POINTER_SIZE == 64 +# pragma pointer_size save +# pragma pointer_size 32 +# endif +typedef char *char_ptr32; +# if __INITIAL_POINTER_SIZE == 64 +# pragma pointer_size restore +# endif + +/* + * On VMS, setbuf() will only take 32-bit pointers, and a compilation + * with /POINTER_SIZE=64 will give off a MAYLOSEDATA2 warning here. + * Since we know that the FILE* really is a 32-bit pointer expanded to + * 64 bits, we also know it's safe to convert it back to a 32-bit pointer. + * As for the buffer parameter, we only use NULL here, so that passes as + * well... + */ +static void vms_setbuf(FILE *fp, char *buf) +{ + setbuf((__FILE_ptr32)fp, (char_ptr32)buf); +} +/* + * This declaration is a nasty hack to get around vms' extension to fopen for + * passing in sharing options being disabled by /STANDARD=ANSI89 + */ +static __FILE_ptr32 (*const vms_fopen)(const char *, const char *, ...) = + (__FILE_ptr32 (*)(const char *, const char *, ...))fopen; +# define VMS_OPEN_ATTRS "shr=get,put,upd,del","ctx=bin,stm","rfm=stm","rat=none","mrs=0" + +# define fopen(fname,mode) vms_fopen((fname), (mode), VMS_OPEN_ATTRS) +# define setbuf(fp,buf) vms_setbuf((fp), (buf)) +#endif + +#define RFILE ".rnd" -/* Note that these functions are intended for seed files only. - * Entropy devices and EGD sockets are handled in rand_unix.c */ +/* + * 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]; - struct stat sb; - int i,ret=0,n; - FILE *in; - - if (file == NULL) return(0); - - i=stat(file,&sb); - /* If the state fails, put some crap in anyway */ - RAND_add(&sb,sizeof(sb),0); - if (i < 0) return(0); - if (bytes == 0) return(ret); - - in=fopen(file,"rb"); - if (in == NULL) goto err; - for (;;) - { - if (bytes > 0) - n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE; - else - n = BUFSIZE; - i=fread(buf,1,n,in); - if (i <= 0) break; - /* even if n != i, use the full array */ - RAND_add(buf,n,i); - ret+=i; - if (bytes > 0) - { - bytes-=n; - if (bytes <= 0) break; - } - } - fclose(in); - OPENSSL_cleanse(buf,BUFSIZE); -err: - return(ret); - } +{ + /*- + * If bytes >= 0, read up to 'bytes' bytes. + * if bytes == -1, read complete file. + */ + + 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 + /* + * 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)); + if (stat(file, &sb) < 0) + return (0); + RAND_add(&sb, sizeof(sb), 0.0); +#endif + if (bytes == 0) + return (ret); + + in = fopen(file, "rb"); + if (in == NULL) + goto err; +#if defined(S_ISBLK) && defined(S_ISCHR) && !defined(OPENSSL_NO_POSIX_IO) + if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) { + /* + * 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? */ + setbuf(in, NULL); /* don't do buffered reads */ + } +#endif + for (;;) { + if (bytes > 0) + n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE; + else + n = BUFSIZE; + i = fread(buf, 1, n, in); + if (i <= 0) + break; + + RAND_add(buf, i, (double)i); + 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; - -#if defined(O_CREAT) && !defined(OPENSSL_SYS_WIN32) - /* For some reason Win32 can't write to files created this way */ - - /* chmod(..., 0600) is too late to protect the file, - * permissions should be restrictive from the start */ - int fd = open(file, O_CREAT, 0600); - if (fd != -1) - out = fdopen(fd, "wb"); -#endif - if (out == NULL) - out = fopen(file,"wb"); - 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; - } +{ + 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 - /* Try to delete older versions of the file, until there aren't - any */ - { - char *tmpf; - - tmpf = OPENSSL_malloc(strlen(file) + 4); /* to add ";-1" and a nul */ - if (tmpf) - { - strcpy(tmpf, file); - strcat(tmpf, ";-1"); - while(delete(tmpf) == 0) - ; - rename(file,";1"); /* Make sure it's version 1, or we - will reach the limit (32767) at - some point... */ - } - } -#endif /* OPENSSL_SYS_VMS */ - - fclose(out); - OPENSSL_cleanse(buf,BUFSIZE); -err: - return (rand_err ? -1 : ret); - } + /* + * 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 = fopen(file, "rb+"); +#endif + if (out == NULL) + out = fopen(file, "wb"); + if (out == NULL) + goto err; + +#if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO) + 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; - char *ret=NULL; - - if (OPENSSL_issetugid() == 0) - s=getenv("RANDFILE"); - if (s != NULL) - { - if(strlen(s) >= size) - return NULL; - strcpy(buf,s); - ret=buf; - } - else - { - if (OPENSSL_issetugid() == 0) - s=getenv("HOME"); +{ + 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 (OPENSSL_strlcpy(buf, s, size) >= size) + return NULL; + } else { +#ifdef OPENSSL_SYS_WINDOWS + /* + * We use the same env variables as GetTempFile() - but that function + * uses TCHARs, but getenv() gives us chars so its easier to do it this + * way + */ + if ((s = getenv("TMP")) == NULL + && (s = getenv("TEMP")) == NULL + && (s = getenv("USERPROFILE")) == NULL + && (s = getenv("SYSTEMROOT")) == NULL) { + s = getenv("HOME"); + } +#else + if (OPENSSL_issetugid() == 0) + s = getenv("HOME"); +#endif #ifdef DEFAULT_HOME - if (s == NULL) - { - s = DEFAULT_HOME; - } -#endif - if (s != NULL && (strlen(s)+strlen(RFILE)+2 < size)) - { - strcpy(buf,s); + if (s == NULL) { + s = DEFAULT_HOME; + } +#endif + if (s && *s && strlen(s) + strlen(RFILE) + 2 < size) { + OPENSSL_strlcpy(buf, s, size); #ifndef OPENSSL_SYS_VMS - strcat(buf,"/"); -#endif - strcat(buf,RFILE); - ret=buf; - } - else - buf[0] = '\0'; /* no file name */ - } - return(ret); - } + OPENSSL_strlcat(buf, "/", size); +#endif + OPENSSL_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 (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) { + return (NULL); + } + if (stat(buf, &sb) == -1) + if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) { + return (NULL); + } +#endif + return (buf); +}