acb5617538
(ftruncate64): Ditto. (lseek64): Ditto. (lstat64): Ditto. (mmap64): Ditto. (seekdir64): Ditto. (stat64): Ditto. (telldir64): Ditto. (truncate64): Ditto. * dir.cc (telldir64): New function. (telldir): Call telldir64(). (seekdir64): New function. (seekdir): Call seekdir64(). * fhandler.h: Redefine all methods using __off32_t to use __off64_t. * fhandler.cc: Use __off64_t and struct __stat64 throughout. * fhandler_clipboard.cc: Ditto. * fhandler_disk_file.cc: Ditto. * fhandler_dsp.cc: Ditto. * fhandler_floppy.cc: Ditto. * fhandler_mem.cc: Ditto. * fhandler_random.cc: Ditto. * fhandler_socket.cc: Ditto. * fhandler_tape.cc: Ditto. * fhandler_zero.cc: Ditto. * pipe.cc: Ditto. * glob.c: Ditto, call lstat64 and stat64 in Cygwin. * mmap.cc: Use __off64_t throughout. (mmap64): New function. * sec_acl.cc (acl_worker): Use struct __stat64, call stat64 and lstat64. * syscalls.cc (lseek64): New function. (stat64_to_stat32): Ditto. (fstat64): Ditto. (stat64): Ditto. (lstat64): Ditto. (ftruncate64): Ditto. (truncate64): Ditto. (_fstat): Call fstat64. (_stat): Call stat64. (cygwin_lstat): Rename to avoid declaration problem. Call lstat64. (stat_worker): Use struct __stat64. (access): Ditto. (ftruncate): Call ftruncate64. (truncate): Call truncate64. * wincap.cc: Set flag has_64bit_file_access appropriately. * wincap.h: Add flag has_64bit_file_access. * winsup.h (ILLEGAL_SEEK): Define as __off64_t. (stat_dev): Declare using struct __stat64. (stat_worker): Ditto. * include/cygwin/stat.h (struct __stat32): Define if compiling Cygwin. (struct __stat64): Ditto. (struct stat): Revert definition with explicitly sized datatypes. Eliminate sized field names. * include/cygwin/types.h (blksize_t): New type. (__blkcnt32_t): Ditto. (__blkcnt64_t): Ditto. (blkcnt_t): Ditto.
166 lines
3.8 KiB
C++
166 lines
3.8 KiB
C++
/* fhandler_random.cc: code to access /dev/random and /dev/urandom
|
|
|
|
Copyright 2000, 2001, 2002 Red Hat, Inc.
|
|
|
|
Written by Corinna Vinschen (vinschen@cygnus.com)
|
|
|
|
This file is part of Cygwin.
|
|
|
|
This software is a copyrighted work licensed under the terms of the
|
|
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
|
|
details. */
|
|
|
|
#include "winsup.h"
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include "cygerrno.h"
|
|
#include "security.h"
|
|
#include "fhandler.h"
|
|
|
|
#define RANDOM 8
|
|
#define URANDOM 9
|
|
|
|
#define PSEUDO_MULTIPLIER (6364136223846793005LL)
|
|
#define PSEUDO_SHIFTVAL (21)
|
|
|
|
fhandler_dev_random::fhandler_dev_random (int nunit)
|
|
: fhandler_base (FH_RANDOM), unit(nunit), crypt_prov((HCRYPTPROV) NULL)
|
|
{
|
|
}
|
|
|
|
int
|
|
fhandler_dev_random::open (path_conv *, int flags, mode_t)
|
|
{
|
|
set_flags (flags);
|
|
set_open_status ();
|
|
return 1;
|
|
}
|
|
|
|
BOOL
|
|
fhandler_dev_random::crypt_gen_random (void *ptr, size_t len)
|
|
{
|
|
if (!crypt_prov
|
|
&& !CryptAcquireContext (&crypt_prov, NULL, MS_DEF_PROV, PROV_RSA_FULL,
|
|
CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)
|
|
&& !CryptAcquireContext (&crypt_prov, NULL, MS_DEF_PROV, PROV_RSA_FULL,
|
|
CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET
|
|
| CRYPT_NEWKEYSET))
|
|
{
|
|
debug_printf ("%E = CryptAquireContext()");
|
|
return FALSE;
|
|
}
|
|
if (!CryptGenRandom (crypt_prov, len, (BYTE *)ptr))
|
|
{
|
|
debug_printf ("%E = CryptGenRandom()");
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
int
|
|
fhandler_dev_random::pseudo_write (const void *ptr, size_t len)
|
|
{
|
|
/* Use buffer to mess up the pseudo random number generator. */
|
|
for (size_t i = 0; i < len; ++i)
|
|
pseudo = (pseudo + ((unsigned char *)ptr)[i]) * PSEUDO_MULTIPLIER + 1;
|
|
return len;
|
|
}
|
|
|
|
int
|
|
fhandler_dev_random::write (const void *ptr, size_t len)
|
|
{
|
|
if (!len)
|
|
return 0;
|
|
if (!ptr)
|
|
{
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
/* Limit len to a value <= 512 since we don't want to overact.
|
|
Copy to local buffer because CryptGenRandom violates const. */
|
|
unsigned char buf[512];
|
|
size_t limited_len = len <= 512 ? len : 512;
|
|
memcpy (buf, ptr, limited_len);
|
|
|
|
/* Mess up system entropy source. Return error if device is /dev/random. */
|
|
if (!crypt_gen_random (buf, limited_len) && unit == RANDOM)
|
|
{
|
|
__seterrno ();
|
|
return -1;
|
|
}
|
|
/* Mess up the pseudo random number generator. */
|
|
pseudo_write (buf, limited_len);
|
|
return len;
|
|
}
|
|
|
|
int
|
|
fhandler_dev_random::pseudo_read (void *ptr, size_t len)
|
|
{
|
|
/* Use pseudo random number generator as fallback entropy source.
|
|
This multiplier was obtained from Knuth, D.E., "The Art of
|
|
Computer Programming," Vol 2, Seminumerical Algorithms, Third
|
|
Edition, Addison-Wesley, 1998, p. 106 (line 26) & p. 108 */
|
|
for (size_t i = 0; i < len; ++i)
|
|
{
|
|
pseudo = pseudo * PSEUDO_MULTIPLIER + 1;
|
|
((unsigned char *)ptr)[i] = (pseudo >> PSEUDO_SHIFTVAL) & UCHAR_MAX;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_dev_random::read (void *ptr, size_t len)
|
|
{
|
|
if (!len)
|
|
return 0;
|
|
if (!ptr)
|
|
{
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
if (crypt_gen_random (ptr, len))
|
|
return len;
|
|
/* If device is /dev/urandom, use pseudo number generator as fallback.
|
|
Don't do this for /dev/random since it's intended for uses that need
|
|
very high quality randomness. */
|
|
if (unit == URANDOM)
|
|
return pseudo_read (ptr, len);
|
|
|
|
__seterrno ();
|
|
return -1;
|
|
}
|
|
|
|
__off64_t
|
|
fhandler_dev_random::lseek (__off64_t, int)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_dev_random::close (void)
|
|
{
|
|
if (crypt_prov)
|
|
while (!CryptReleaseContext (crypt_prov, 0)
|
|
&& GetLastError () == ERROR_BUSY)
|
|
Sleep(10);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_dev_random::dup (fhandler_base *child)
|
|
{
|
|
fhandler_dev_random *fhr = (fhandler_dev_random *) child;
|
|
fhr->unit = unit;
|
|
fhr->crypt_prov = (HCRYPTPROV)NULL;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
fhandler_dev_random::dump ()
|
|
{
|
|
paranoid_printf("here, fhandler_dev_random");
|
|
}
|
|
|