#ifndef OPENSSL_NO_POSIX_IO
# include <sys/stat.h>
# include <fcntl.h>
+#endif
+
/*
* Following should not be needed, and we could have been stricter
* and demand S_IS*. But some systems just don't comply... Formally
* 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
+# if !defined(S_ISREG)
+# define S_ISREG(m) ((m) & S_IFREG)
# 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
+#define RAND_FILE_SIZE 1024
#ifdef OPENSSL_SYS_VMS
/*
* __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
/*
* 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"
+ (__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
/*
* Note that these functions are intended for seed files only. Entropy
- * devices and EGD sockets are handled in rand_unix.c
+ * devices and EGD sockets are handled in rand_unix.c If |bytes| is
+ * -1 read the complete file; otherwise read the specified amount.
*/
-
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];
+ unsigned char buf[RAND_FILE_SIZE];
#ifndef OPENSSL_NO_POSIX_IO
struct stat sb;
#endif
- int i, ret = 0, n;
- FILE *in = NULL;
-
- if (file == NULL)
- return 0;
+ int i, n, ret = 0;
+ FILE *in;
if (bytes == 0)
- return ret;
-
- in = openssl_fopen(file, "rb");
- if (in == NULL)
- goto err;
+ 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 (fstat(fileno(in), &sb) < 0)
- goto err;
- RAND_add(&sb, sizeof(sb), 0.0);
-
+ if (stat(file, &sb) < 0 || !S_ISREG(sb.st_mode)) {
+ RANDerr(RAND_F_RAND_LOAD_FILE, RAND_R_NOT_A_REGULAR_FILE);
+ ERR_add_error_data(2, "Filename=", file);
+ return -1;
+ }
#endif
- for (;;) {
+ if ((in = openssl_fopen(file, "rb")) == NULL) {
+ RANDerr(RAND_F_RAND_LOAD_FILE, RAND_R_CANNOT_OPEN_FILE);
+ ERR_add_error_data(2, "Filename=", file);
+ return -1;
+ }
+
+ for ( ; ; ) {
if (bytes > 0)
- n = (bytes < BUFSIZE) ? (int)bytes : BUFSIZE;
+ n = (bytes < RAND_FILE_SIZE) ? (int)bytes : RAND_FILE_SIZE;
else
- n = BUFSIZE;
+ n = RAND_FILE_SIZE;
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;
- }
+
+ /* If given a bytecount, and we did it, break. */
+ if (bytes > 0 && (bytes -= i) <= 0)
+ break;
}
- OPENSSL_cleanse(buf, BUFSIZE);
- err:
- if (in != NULL)
- fclose(in);
+
+ OPENSSL_cleanse(buf, sizeof(buf));
+ fclose(in);
return ret;
}
int RAND_write_file(const char *file)
{
- unsigned char buf[BUFSIZE];
- int i, ret = 0, rand_err = 0;
+ unsigned char buf[RAND_FILE_SIZE];
+ int ret = -1;
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
-# endif
+ if (stat(file, &sb) >= 0 && !S_ISREG(sb.st_mode)) {
+ RANDerr(RAND_F_RAND_WRITE_FILE, RAND_R_NOT_A_REGULAR_FILE);
+ ERR_add_error_data(2, "Filename=", file);
+ return -1;
+ }
#endif
+ /* Collect enough random data. */
+ if (RAND_bytes(buf, (int)sizeof(buf)) != 1)
+ return -1;
+
#if defined(O_CREAT) && !defined(OPENSSL_NO_POSIX_IO) && \
!defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_WINDOWS)
{
* 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;
+ return -1;
#if !defined(NO_CHMOD) && !defined(OPENSSL_NO_POSIX_IO)
+ /*
+ * Yes it's late to do this (see above comment), but better than nothing.
+ */
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;
- }
+ ret = fwrite(buf, 1, RAND_FILE_SIZE, out);
fclose(out);
- OPENSSL_cleanse(buf, BUFSIZE);
- err:
- return (rand_err ? -1 : ret);
+ OPENSSL_cleanse(buf, RAND_FILE_SIZE);
+ return ret;
}
const char *RAND_file_name(char *buf, size_t size)
{
char *s = NULL;
+ size_t len;
int use_randfile = 1;
#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);
+ DWORD envlen;
+ WCHAR *var;
+
+ /* Look up various environment variables. */
+ if ((envlen = GetEnvironmentVariableW(var = L"RANDFILE", NULL, 0)) == 0) {
+ use_randfile = 0;
+ if ((envlen = GetEnvironmentVariableW(var = L"HOME", NULL, 0)) == 0
+ && (envlen = GetEnvironmentVariableW(var = L"USERPROFILE",
+ NULL, 0)) == 0)
+ envlen = GetEnvironmentVariableW(var = L"SYSTEMROOT", NULL, 0);
}
- if (len != 0) {
+ /* If we got a value, allocate space to hold it and then get it. */
+ if (envlen != 0) {
int sz;
+ WCHAR *val = _alloca(envlen * sizeof(WCHAR));
- val = _alloca(len * sizeof(WCHAR));
-
- if (GetEnvironmentVariableW(var, val, len) < len
- && (sz = WideCharToMultiByte(CP_UTF8, 0, val, -1, NULL, 0,
- NULL, NULL)) != 0) {
+ if (GetEnvironmentVariableW(var, val, envlen) < envlen
+ && (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)
#else
if (OPENSSL_issetugid() != 0) {
use_randfile = 0;
- } else {
- s = getenv("RANDFILE");
- if (s == NULL || *s == '\0') {
- use_randfile = 0;
- s = getenv("HOME");
- }
+ } else if ((s = getenv("RANDFILE")) == NULL || *s == '\0') {
+ use_randfile = 0;
+ s = getenv("HOME");
}
#endif
+
#ifdef DEFAULT_HOME
- if (!use_randfile && s == NULL) {
+ 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);
+ if (s == NULL || *s == '\0')
+ return NULL;
+
+ len = strlen(s);
+ if (use_randfile) {
+ if (len + 1 >= size)
+ return NULL;
+ strcpy(buf, s);
+ } else {
+ if (len + 1 + strlen(RFILE) + 1 >= size)
+ return NULL;
+ strcpy(buf, s);
#ifndef OPENSSL_SYS_VMS
- OPENSSL_strlcat(buf, "/", size);
+ strcat(buf, "/");
#endif
- OPENSSL_strlcat(buf, RFILE, size);
- }
- } else {
- buf[0] = '\0'; /* no file name */
+ strcat(buf, RFILE);
}
- return buf[0] ? buf : NULL;
+ return buf;
}
#include <openssl/rand.h>
- const char *RAND_file_name(char *buf, size_t num);
-
int RAND_load_file(const char *filename, long max_bytes);
int RAND_write_file(const char *filename);
+ const char *RAND_file_name(char *buf, size_t num);
+
=head1 DESCRIPTION
+RAND_load_file() reads a number of bytes from file B<filename> and
+adds them to the PRNG. If B<max_bytes> is non-negative,
+up to B<max_bytes> are read;
+if B<max_bytes> is -1, the complete file is read.
+
+RAND_write_file() writes a number of random bytes (currently 256) to
+file B<filename> which can be used to initialize the PRNG by calling
+RAND_load_file() in a later session.
+
RAND_file_name() generates a default path for the random seed
file. B<buf> points to a buffer of size B<num> in which to store the
filename.
On all systems, if the environment variable B<RANDFILE> is set, its
value will be used as the seed file name.
-
-Otherwise, the file is called ".rnd", found in platform dependent locations:
+Otherwise, the file is called C<.rnd>, found in platform dependent locations:
=over 4
=item On Windows (in order of preference)
-%HOME%, %USERPROFILE%, %SYSTEMROOT%, C:\
+ %HOME%, %USERPROFILE%, %SYSTEMROOT%, C:\
=item On VMS
-SYS$LOGIN:
+ SYS$LOGIN:
=item On all other systems
-$HOME
+ $HOME
=back
If C<$HOME> (on non-Windows and non-VMS system) is not set either, or
B<num> is too small for the path name, an error occurs.
-RAND_load_file() reads a number of bytes from file B<filename> and
-adds them to the PRNG. If B<max_bytes> is non-negative,
-up to B<max_bytes> are read;
-if B<max_bytes> is -1, the complete file is read.
-
-RAND_write_file() writes a number of random bytes (currently 1024) to
-file B<filename> which can be used to initialize the PRNG by calling
-RAND_load_file() in a later session.
-
=head1 RETURN VALUES
RAND_load_file() returns the number of bytes read.
L<RAND_bytes(3)>, L<RAND_add(3)>, L<RAND_cleanup(3)>
+=head1 HISTORY
+
+A comment in the source since at least OpenSSL version 1.0.2 said that
+RAND_load_file() and RAND_write_file() were only intended for regular files,
+and not really device special files such as C</dev/random>. This was
+poorly enforced before OpenSSL version 1.1.1.
+
=head1 COPYRIGHT
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
projects / oweals / openssl.git / commitdiff