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/*
* 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 <openssl/rand.h>
#include "rand_lcl.h"
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
# include <windows.h>
# ifndef _WIN32_WINNT
# define _WIN32_WINNT 0x0400
# endif
# include <wincrypt.h>
# include <tlhelp32.h>
/*
* Limit the time spent walking through the heap, processes, threads and
* modules to a maximum of 1000 milliseconds each, unless CryptoGenRandom
* failed
*/
# define MAXDELAY 1000
/*
* Intel hardware RNG CSP -- available from
* http://developer.intel.com/design/security/rng/redist_license.htm
*/
# define PROV_INTEL_SEC 22
# define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
static void readtimer(void);
static void readscreen(void);
/*
* It appears like CURSORINFO, PCURSORINFO and LPCURSORINFO are only defined
* when WINVER is 0x0500 and up, which currently only happens on Win2000.
* Unfortunately, those are typedefs, so they're a little bit difficult to
* detect properly. On the other hand, the macro CURSOR_SHOWING is defined
* within the same conditional, so it can be use to detect the absence of
* said typedefs.
*/
# ifndef CURSOR_SHOWING
/*
* Information about the global cursor.
*/
typedef struct tagCURSORINFO {
DWORD cbSize;
DWORD flags;
HCURSOR hCursor;
POINT ptScreenPos;
} CURSORINFO, *PCURSORINFO, *LPCURSORINFO;
# define CURSOR_SHOWING 0x00000001
# endif /* CURSOR_SHOWING */
# if !defined(OPENSSL_SYS_WINCE)
typedef BOOL(WINAPI *CRYPTACQUIRECONTEXTW) (HCRYPTPROV *, LPCWSTR, LPCWSTR,
DWORD, DWORD);
typedef BOOL(WINAPI *CRYPTGENRANDOM) (HCRYPTPROV, DWORD, BYTE *);
typedef BOOL(WINAPI *CRYPTRELEASECONTEXT) (HCRYPTPROV, DWORD);
typedef HWND(WINAPI *GETFOREGROUNDWINDOW) (VOID);
typedef BOOL(WINAPI *GETCURSORINFO) (PCURSORINFO);
typedef DWORD(WINAPI *GETQUEUESTATUS) (UINT);
typedef HANDLE(WINAPI *CREATETOOLHELP32SNAPSHOT) (DWORD, DWORD);
typedef BOOL(WINAPI *CLOSETOOLHELP32SNAPSHOT) (HANDLE);
typedef BOOL(WINAPI *HEAP32FIRST) (LPHEAPENTRY32, DWORD, size_t);
typedef BOOL(WINAPI *HEAP32NEXT) (LPHEAPENTRY32);
typedef BOOL(WINAPI *HEAP32LIST) (HANDLE, LPHEAPLIST32);
typedef BOOL(WINAPI *PROCESS32) (HANDLE, LPPROCESSENTRY32);
typedef BOOL(WINAPI *THREAD32) (HANDLE, LPTHREADENTRY32);
typedef BOOL(WINAPI *MODULE32) (HANDLE, LPMODULEENTRY32);
# include <lmcons.h>
# include <lmstats.h>
/*
* The NET API is Unicode only. It requires the use of the UNICODE macro.
* When UNICODE is defined LPTSTR becomes LPWSTR. LMSTR was was added to the
* Platform SDK to allow the NET API to be used in non-Unicode applications
* provided that Unicode strings were still used for input. LMSTR is defined
* as LPWSTR.
*/
typedef NET_API_STATUS(NET_API_FUNCTION *NETSTATGET)
(LPWSTR, LPWSTR, DWORD, DWORD, LPBYTE *);
typedef NET_API_STATUS(NET_API_FUNCTION *NETFREE) (LPBYTE);
# endif /* !OPENSSL_SYS_WINCE */
int RAND_poll(void)
{
MEMORYSTATUS mst;
HCRYPTPROV hProvider = 0;
DWORD w;
int good = 0;
# if defined(OPENSSL_SYS_WINCE)
# if defined(_WIN32_WCE) && _WIN32_WCE>=300
/*
* Even though MSDN says _WIN32_WCE>=210, it doesn't seem to be available
* in commonly available implementations prior 300...
*/
{
BYTE buf[64];
/* poll the CryptoAPI PRNG */
/* The CryptoAPI returns sizeof(buf) bytes of randomness */
if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT)) {
if (CryptGenRandom(hProvider, sizeof(buf), buf))
RAND_add(buf, sizeof(buf), sizeof(buf));
CryptReleaseContext(hProvider, 0);
}
}
# endif
# else /* OPENSSL_SYS_WINCE */
/*
* None of below libraries are present on Windows CE, which is
* why we #ifndef the whole section. This also excuses us from
* handling the GetProcAddress issue. The trouble is that in
* real Win32 API GetProcAddress is available in ANSI flavor
* only. In WinCE on the other hand GetProcAddress is a macro
* most commonly defined as GetProcAddressW, which accepts
* Unicode argument. If we were to call GetProcAddress under
* WinCE, I'd recommend to either redefine GetProcAddress as
* GetProcAddressA (there seem to be one in common CE spec) or
* implement own shim routine, which would accept ANSI argument
* and expand it to Unicode.
*/
{
/* load functions dynamically - not available on all systems */
HMODULE advapi = LoadLibrary(TEXT("ADVAPI32.DLL"));
HMODULE kernel = LoadLibrary(TEXT("KERNEL32.DLL"));
HMODULE user = NULL;
HMODULE netapi = LoadLibrary(TEXT("NETAPI32.DLL"));
CRYPTACQUIRECONTEXTW acquire = NULL;
CRYPTGENRANDOM gen = NULL;
CRYPTRELEASECONTEXT release = NULL;
NETSTATGET netstatget = NULL;
NETFREE netfree = NULL;
BYTE buf[64];
if (netapi) {
netstatget =
(NETSTATGET) GetProcAddress(netapi, "NetStatisticsGet");
netfree = (NETFREE) GetProcAddress(netapi, "NetApiBufferFree");
}
if (netstatget && netfree) {
LPBYTE outbuf;
/*
* NetStatisticsGet() is a Unicode only function
* STAT_WORKSTATION_0 contains 45 fields and STAT_SERVER_0
* contains 17 fields. We treat each field as a source of one
* byte of entropy.
*/
if (netstatget(NULL, L"LanmanWorkstation", 0, 0, &outbuf) == 0) {
RAND_add(outbuf, sizeof(STAT_WORKSTATION_0), 45);
netfree(outbuf);
}
if (netstatget(NULL, L"LanmanServer", 0, 0, &outbuf) == 0) {
RAND_add(outbuf, sizeof(STAT_SERVER_0), 17);
netfree(outbuf);
}
}
if (netapi)
FreeLibrary(netapi);
/*
* It appears like this can cause an exception deep within
* ADVAPI32.DLL at random times on Windows 2000. Reported by Jeffrey
* Altman. Only use it on NT.
*/
if (advapi) {
/*
* If it's available, then it's available in both ANSI
* and UNICODE flavors even in Win9x, documentation says.
* We favor Unicode...
*/
acquire = (CRYPTACQUIRECONTEXTW) GetProcAddress(advapi,
"CryptAcquireContextW");
gen = (CRYPTGENRANDOM) GetProcAddress(advapi, "CryptGenRandom");
release = (CRYPTRELEASECONTEXT) GetProcAddress(advapi,
"CryptReleaseContext");
}
if (acquire && gen && release) {
/* poll the CryptoAPI PRNG */
/* The CryptoAPI returns sizeof(buf) bytes of randomness */
if (acquire(&hProvider, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT)) {
if (gen(hProvider, sizeof(buf), buf) != 0) {
RAND_add(buf, sizeof(buf), 0);
good = 1;
}
release(hProvider, 0);
}
/* poll the Pentium PRG with CryptoAPI */
if (acquire(&hProvider, 0, INTEL_DEF_PROV, PROV_INTEL_SEC, 0)) {
if (gen(hProvider, sizeof(buf), buf) != 0) {
RAND_add(buf, sizeof(buf), sizeof(buf));
good = 1;
}
release(hProvider, 0);
}
}
if (advapi
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