/* 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 #include #include #include #include "e_os.h" #include #include #include #ifdef OPENSSL_SYS_VMS #include #endif #ifndef NO_SYS_TYPES_H # include #endif #ifndef OPENSSL_NO_POSIX_IO # include # include #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); }