/* * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. * * 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 "internal/cryptlib.h" #include #include #include #include #include #include #include #ifdef OPENSSL_SYS_VMS # include #endif #ifndef NO_SYS_TYPES_H # include #endif #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 # define fstat _fstat # define fileno _fileno #endif #undef BUFSIZE #define BUFSIZE 1024 #define RAND_DATA 1024 #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 typedef char *char_ptr32; # pragma pointer_size restore /* * 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... */ # define setbuf(fp,buf) (setbuf)((__FILE_ptr32)(fp), (char_ptr32)(buf)) # endif /* * 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 openssl_fopen(fname,mode) vms_fopen((fname), (mode), VMS_OPEN_ATTRS) #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 */ int RAND_load_file(const char *file, long bytes) { /*- * 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 = NULL; if (file == NULL) return 0; if (bytes == 0) return ret; in = openssl_fopen(file, "rb"); if (in == NULL) goto err; #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 (fstat(fileno(in), &sb) < 0) goto err; RAND_add(&sb, sizeof(sb), 0.0); # 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 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 #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; } } OPENSSL_cleanse(buf, BUFSIZE); err: if (in != NULL) fclose(in); 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; # if defined(S_ISBLK) && defined(S_ISCHR) # ifdef _WIN32 /* * Check for |file| being a driver as "ASCII-safe" on Windows, * because driver paths are always ASCII. */ # endif i = stat(file, &sb); if (i != -1) { 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) && !defined(OPENSSL_SYS_WINDOWS) { # 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 = openssl_fopen(file, "rb+"); #endif if (out == NULL) out = openssl_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; int use_randfile = 1; #ifdef __OpenBSD__ struct stat sb; #endif #if defined(_WIN32) && defined(CP_UTF8) DWORD len; WCHAR *var, *val; if ((var = L"RANDFILE", len = GetEnvironmentVariableW(var, NULL, 0)) == 0 && (var = L"HOME", use_randfile = 0, len = GetEnvironmentVariableW(var, NULL, 0)) == 0 && (var = L"USERPROFILE", len = GetEnvironmentVariableW(var, NULL, 0)) == 0) { var = L"SYSTEMROOT", len = GetEnvironmentVariableW(var, NULL, 0); } if (len != 0) { int sz; val = _alloca(len * sizeof(WCHAR)); if (GetEnvironmentVariableW(var, val, len) < len && (sz = WideCharToMultiByte(CP_UTF8, 0, val, -1, NULL, 0, NULL, NULL)) != 0) { s = _alloca(sz); if (WideCharToMultiByte(CP_UTF8, 0, val, -1, s, sz, NULL, NULL) == 0) s = NULL; } } #else if (OPENSSL_issetugid() != 0) { use_randfile = 0; } else { s = getenv("RANDFILE"); if (s == NULL || *s == '\0') { use_randfile = 0; s = getenv("HOME"); } } #endif #ifdef DEFAULT_HOME if (!use_randfile && s == NULL) { s = DEFAULT_HOME; } #endif if (s != NULL && *s) { size_t len = strlen(s); if (use_randfile && len + 1 < size) { if (OPENSSL_strlcpy(buf, s, size) >= size) return NULL; } else if (len + strlen(RFILE) + 2 < size) { OPENSSL_strlcpy(buf, s, size); #ifndef OPENSSL_SYS_VMS 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] || stat(buf, &sb) == -1) if (OPENSSL_strlcpy(buf, "/dev/arandom", size) >= size) { return NULL; } #endif return buf[0] ? buf : NULL; }