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/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1994-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
#include "secrng.h"
#ifdef XP_WIN
#include <windows.h>
#include <time.h>
#include <io.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#ifndef _WIN32
#define VTD_Device_ID 5
#define OP_OVERRIDE _asm _emit 0x66
#include <dos.h>
#endif
static BOOL
CurrentClockTickTime(LPDWORD lpdwHigh, LPDWORD lpdwLow)
{
#ifdef _WIN32
LARGE_INTEGER liCount;
if (!QueryPerformanceCounter(&liCount))
return FALSE;
*lpdwHigh = liCount.u.HighPart;
*lpdwLow = liCount.u.LowPart;
return TRUE;
#else /* is WIN16 */
BOOL bRetVal;
FARPROC lpAPI;
WORD w1, w2, w3, w4;
// Get direct access to the VTD and query the current clock tick time
_asm {
xor di, di
mov es, di
mov ax, 1684h
mov bx, VTD_Device_ID
int 2fh
mov ax, es
or ax, di
jz EnumerateFailed
; VTD API is available. First store the API address (the address actually
; contains an instruction that causes a fault, the fault handler then
; makes the ring transition and calls the API in the VxD)
mov word ptr lpAPI, di
mov word ptr lpAPI+2, es
mov ax, 100h ; API function to VTD_Get_Real_Time
; call dword ptr [lpAPI]
call [lpAPI]
; Result is in EDX:EAX which we will get 16-bits at a time
mov w2, dx
OP_OVERRIDE
shr dx,10h ; really "shr edx, 16"
mov w1, dx
mov w4, ax
OP_OVERRIDE
shr ax,10h ; really "shr eax, 16"
mov w3, ax
mov bRetVal, 1 ; return TRUE
jmp EnumerateExit
EnumerateFailed:
mov bRetVal, 0 ; return FALSE
EnumerateExit:
}
*lpdwHigh = MAKELONG(w2, w1);
*lpdwLow = MAKELONG(w4, w3);
return bRetVal;
#endif /* is WIN16 */
}
size_t RNG_GetNoise(void *buf, size_t maxbuf)
{
DWORD dwHigh, dwLow, dwVal;
int n = 0;
int nBytes;
time_t sTime;
if (maxbuf <= 0)
return 0;
CurrentClockTickTime(&dwHigh, &dwLow);
// get the maximally changing bits first
nBytes = sizeof(dwLow) > maxbuf ? maxbuf : sizeof(dwLow);
memcpy((char *)buf, &dwLow, nBytes);
n += nBytes;
maxbuf -= nBytes;
if (maxbuf <= 0)
return n;
nBytes = sizeof(dwHigh) > maxbuf ? maxbuf : sizeof(dwHigh);
memcpy(((char *)buf) + n, &dwHigh, nBytes);
n += nBytes;
maxbuf -= nBytes;
if (maxbuf <= 0)
return n;
// get the number of milliseconds that have elapsed since Windows started
dwVal = GetTickCount();
nBytes = sizeof(dwVal) > maxbuf ? maxbuf : sizeof(dwVal);
memcpy(((char *)buf) + n, &dwVal, nBytes);
n += nBytes;
maxbuf -= nBytes;
if (maxbuf <= 0)
return n;
// get the time in seconds since midnight Jan 1, 1970
time(&sTime);
nBytes = sizeof(sTime) > maxbuf ? maxbuf : sizeof(sTime);
memcpy(((char *)buf) + n, &sTime, nBytes);
n += nBytes;
return n;
}
static BOOL
EnumSystemFiles(void (*func)(char *))
{
int iStatus;
char szSysDir[_MAX_PATH];
char szFileName[_MAX_PATH];
#ifdef _WIN32
struct _finddata_t fdData;
long lFindHandle;
#else
struct _find_t fdData;
#endif
if (!GetSystemDirectory(szSysDir, sizeof(szSysDir)))
return FALSE;
// tack *.* on the end so we actually look for files. this will
// not overflow
strcpy(szFileName, szSysDir);
strcat(szFileName, "\\*.*");
#ifdef _WIN32
lFindHandle = _findfirst(szFileName, &fdData);
if (lFindHandle == -1)
return FALSE;
#else
if (_dos_findfirst(szFileName, _A_NORMAL | _A_RDONLY | _A_ARCH | _A_SUBDIR, &fdData) != 0)
return FALSE;
#endif
do {
// pass the full pathname to the callback
sprintf(szFileName, "%s\\%s", szSysDir, fdData.name);
(*func)(szFileName);
#ifdef _WIN32
iStatus = _findnext(lFindHandle, &fdData);
#else
iStatus = _dos_findnext(&fdData);
#endif
} while (iStatus == 0);
#ifdef _WIN32
_findclose(lFindHandle);
#endif
return TRUE;
}
static DWORD dwNumFiles, dwReadEvery;
static void
CountFiles(char *file)
{
dwNumFiles++;
}
static void
ReadFiles(char *file)
{
if ((dwNumFiles % dwReadEvery) == 0)
RNG_FileForRNG(file);
dwNumFiles++;
}
static void
ReadSystemFiles()
{
// first count the number of files
dwNumFiles = 0;
if (!EnumSystemFiles(CountFiles))
return;
RNG_RandomUpdate(&dwNumFiles, sizeof(dwNumFiles));
// now read 10 files
if (dwNumFiles == 0)
return;
dwReadEvery = dwNumFiles / 10;
if (dwReadEvery == 0)
dwReadEvery = 1; // less than 10 files
dwNumFiles = 0;
EnumSystemFiles(ReadFiles);
}
void RNG_SystemInfoForRNG(void)
{
DWORD dwVal;
char buffer[256];
int nBytes;
#ifdef _WIN32
MEMORYSTATUS sMem;
DWORD dwSerialNum;
DWORD dwComponentLen;
DWORD dwSysFlags;
char volName[128];
DWORD dwSectors, dwBytes, dwFreeClusters, dwNumClusters;
HANDLE hVal;
#else
int iVal;
HTASK hTask;
WORD wDS, wCS;
LPSTR lpszEnv;
#endif
nBytes = RNG_GetNoise(buffer, 20); // get up to 20 bytes
RNG_RandomUpdate(buffer, nBytes);
#ifdef _WIN32
sMem.dwLength = sizeof(sMem);
GlobalMemoryStatus(&sMem); // assorted memory stats
RNG_RandomUpdate(&sMem, sizeof(sMem));
dwVal = GetLogicalDrives();
RNG_RandomUpdate(&dwVal, sizeof(dwVal)); // bitfields in bits 0-25
#else
dwVal = GetFreeSpace(0);
RNG_RandomUpdate(&dwVal, sizeof(dwVal));
_asm mov wDS, ds;
_asm mov wCS, cs;
RNG_RandomUpdate(&wDS, sizeof(wDS));
RNG_RandomUpdate(&wCS, sizeof(wCS));
#endif
#ifdef _WIN32
dwVal = sizeof(buffer);
if (GetComputerName(buffer, &dwVal))
RNG_RandomUpdate(buffer, dwVal);
/* XXX This is code that got yanked because of NSPR20. We should put it
* back someday.
*/
#ifdef notdef
{
POINT ptVal;
GetCursorPos(&ptVal);
RNG_RandomUpdate(&ptVal, sizeof(ptVal));
}
dwVal = GetQueueStatus(QS_ALLINPUT); // high and low significant
RNG_RandomUpdate(&dwVal, sizeof(dwVal));
{
HWND hWnd;
hWnd = GetClipboardOwner(); // 2 or 4 bytes
RNG_RandomUpdate((void *)&hWnd, sizeof(hWnd));
}
{
UUID sUuid;
UuidCreate(&sUuid); // this will fail on machines with no ethernet
RNG_RandomUpdate(&sUuid, sizeof(sUuid)); // boards. shove the bits in regardless
}
#endif
hVal = GetCurrentProcess(); // 4 byte handle of current task
RNG_RandomUpdate(&hVal, sizeof(hVal));
dwVal = GetCurrentProcessId(); // process ID (4 bytes)
RNG_RandomUpdate(&dwVal, sizeof(dwVal));
volName[0] = '\0';
buffer[0] = '\0';
GetVolumeInformation(NULL,
volName,
sizeof(volName),
&dwSerialNum,
&dwComponentLen,
&dwSysFlags,
buffer,
sizeof(buffer));
RNG_RandomUpdate(volName, strlen(volName));
RNG_RandomUpdate(&dwSerialNum, sizeof(dwSerialNum));
RNG_RandomUpdate(&dwComponentLen, sizeof(dwComponentLen));
RNG_RandomUpdate(&dwSysFlags, sizeof(dwSysFlags));
RNG_RandomUpdate(buffer, strlen(buffer));
if (GetDiskFreeSpace(NULL, &dwSectors, &dwBytes, &dwFreeClusters, &dwNumClusters)) {
RNG_RandomUpdate(&dwSectors, sizeof(dwSectors));
RNG_RandomUpdate(&dwBytes, sizeof(dwBytes));
RNG_RandomUpdate(&dwFreeClusters, sizeof(dwFreeClusters));
RNG_RandomUpdate(&dwNumClusters, sizeof(dwNumClusters));
}
#else /* is WIN16 */
hTask = GetCurrentTask();
RNG_RandomUpdate((void *)&hTask, sizeof(hTask));
iVal = GetNumTasks();
RNG_RandomUpdate(&iVal, sizeof(iVal)); // number of running tasks
lpszEnv = GetDOSEnvironment();
while (*lpszEnv != '\0') {
RNG_RandomUpdate(lpszEnv, strlen(lpszEnv));
lpszEnv += strlen(lpszEnv) + 1;
}
#endif /* is WIN16 */
// now let's do some files
ReadSystemFiles();
nBytes = RNG_GetNoise(buffer, 20); // get up to 20 bytes
RNG_RandomUpdate(buffer, nBytes);
}
void RNG_FileForRNG(char *filename)
{
FILE* file;
int nBytes;
struct stat stat_buf;
unsigned char buffer[1024];
static DWORD totalFileBytes = 0;
/* windows doesn't initialize all the bytes in the stat buf,
* so initialize them all here to avoid UMRs.
*/
memset(&stat_buf, 0, sizeof stat_buf);
if (stat((char *)filename, &stat_buf) < 0)
return;
RNG_RandomUpdate((unsigned char*)&stat_buf, sizeof(stat_buf));
file = fopen((char *)filename, "r");
if (file != NULL) {
for (;;) {
size_t bytes = fread(buffer, 1, sizeof(buffer), file);
if (bytes == 0)
break;
RNG_RandomUpdate(buffer, bytes);
totalFileBytes += bytes;
if (totalFileBytes > 250000)
break;
}
fclose(file);
}
nBytes = RNG_GetNoise(buffer, 20); // get up to 20 bytes
RNG_RandomUpdate(buffer, nBytes);
}
#endif /* is XP_WIN */
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