638 lines
23 KiB
C
638 lines
23 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "internal/cryptlib.h"
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#include <openssl/rand.h>
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#include "rand_lcl.h"
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#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
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# include <windows.h>
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# ifndef _WIN32_WINNT
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# define _WIN32_WINNT 0x0400
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# endif
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# include <wincrypt.h>
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# include <tlhelp32.h>
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/*
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* Limit the time spent walking through the heap, processes, threads and
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* modules to a maximum of 1000 milliseconds each, unless CryptoGenRandom
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* failed
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*/
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# define MAXDELAY 1000
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/*
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* Intel hardware RNG CSP -- available from
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* http://developer.intel.com/design/security/rng/redist_license.htm
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*/
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# define PROV_INTEL_SEC 22
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# define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
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static void readtimer(void);
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static void readscreen(void);
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/*
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* It appears like CURSORINFO, PCURSORINFO and LPCURSORINFO are only defined
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* when WINVER is 0x0500 and up, which currently only happens on Win2000.
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* Unfortunately, those are typedefs, so they're a little bit difficult to
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* detect properly. On the other hand, the macro CURSOR_SHOWING is defined
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* within the same conditional, so it can be use to detect the absence of
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* said typedefs.
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*/
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# ifndef CURSOR_SHOWING
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/*
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* Information about the global cursor.
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*/
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typedef struct tagCURSORINFO {
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DWORD cbSize;
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DWORD flags;
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HCURSOR hCursor;
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POINT ptScreenPos;
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} CURSORINFO, *PCURSORINFO, *LPCURSORINFO;
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# define CURSOR_SHOWING 0x00000001
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# endif /* CURSOR_SHOWING */
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# if !defined(OPENSSL_SYS_WINCE)
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typedef BOOL(WINAPI *CRYPTACQUIRECONTEXTW) (HCRYPTPROV *, LPCWSTR, LPCWSTR,
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DWORD, DWORD);
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typedef BOOL(WINAPI *CRYPTGENRANDOM) (HCRYPTPROV, DWORD, BYTE *);
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typedef BOOL(WINAPI *CRYPTRELEASECONTEXT) (HCRYPTPROV, DWORD);
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typedef HWND(WINAPI *GETFOREGROUNDWINDOW) (VOID);
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typedef BOOL(WINAPI *GETCURSORINFO) (PCURSORINFO);
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typedef DWORD(WINAPI *GETQUEUESTATUS) (UINT);
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typedef HANDLE(WINAPI *CREATETOOLHELP32SNAPSHOT) (DWORD, DWORD);
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typedef BOOL(WINAPI *CLOSETOOLHELP32SNAPSHOT) (HANDLE);
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typedef BOOL(WINAPI *HEAP32FIRST) (LPHEAPENTRY32, DWORD, size_t);
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typedef BOOL(WINAPI *HEAP32NEXT) (LPHEAPENTRY32);
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typedef BOOL(WINAPI *HEAP32LIST) (HANDLE, LPHEAPLIST32);
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typedef BOOL(WINAPI *PROCESS32) (HANDLE, LPPROCESSENTRY32);
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typedef BOOL(WINAPI *THREAD32) (HANDLE, LPTHREADENTRY32);
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typedef BOOL(WINAPI *MODULE32) (HANDLE, LPMODULEENTRY32);
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# include <lmcons.h>
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# include <lmstats.h>
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/*
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* The NET API is Unicode only. It requires the use of the UNICODE macro.
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* When UNICODE is defined LPTSTR becomes LPWSTR. LMSTR was was added to the
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* Platform SDK to allow the NET API to be used in non-Unicode applications
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* provided that Unicode strings were still used for input. LMSTR is defined
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* as LPWSTR.
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*/
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typedef NET_API_STATUS(NET_API_FUNCTION *NETSTATGET)
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(LPWSTR, LPWSTR, DWORD, DWORD, LPBYTE *);
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typedef NET_API_STATUS(NET_API_FUNCTION *NETFREE) (LPBYTE);
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# endif /* !OPENSSL_SYS_WINCE */
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int RAND_poll(void)
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{
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MEMORYSTATUS mst;
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HCRYPTPROV hProvider = 0;
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DWORD w;
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int good = 0;
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# if defined(OPENSSL_SYS_WINCE)
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# if defined(_WIN32_WCE) && _WIN32_WCE>=300
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/*
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* Even though MSDN says _WIN32_WCE>=210, it doesn't seem to be available
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* in commonly available implementations prior 300...
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*/
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{
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BYTE buf[64];
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/* poll the CryptoAPI PRNG */
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/* The CryptoAPI returns sizeof(buf) bytes of randomness */
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if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT)) {
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if (CryptGenRandom(hProvider, sizeof(buf), buf))
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RAND_add(buf, sizeof(buf), sizeof(buf));
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CryptReleaseContext(hProvider, 0);
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}
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}
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# endif
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# else /* OPENSSL_SYS_WINCE */
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/*
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* None of below libraries are present on Windows CE, which is
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* why we #ifndef the whole section. This also excuses us from
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* handling the GetProcAddress issue. The trouble is that in
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* real Win32 API GetProcAddress is available in ANSI flavor
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* only. In WinCE on the other hand GetProcAddress is a macro
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* most commonly defined as GetProcAddressW, which accepts
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* Unicode argument. If we were to call GetProcAddress under
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* WinCE, I'd recommend to either redefine GetProcAddress as
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* GetProcAddressA (there seem to be one in common CE spec) or
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* implement own shim routine, which would accept ANSI argument
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* and expand it to Unicode.
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*/
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{
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/* load functions dynamically - not available on all systems */
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HMODULE advapi = LoadLibrary(TEXT("ADVAPI32.DLL"));
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HMODULE kernel = LoadLibrary(TEXT("KERNEL32.DLL"));
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HMODULE user = NULL;
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HMODULE netapi = LoadLibrary(TEXT("NETAPI32.DLL"));
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CRYPTACQUIRECONTEXTW acquire = NULL;
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CRYPTGENRANDOM gen = NULL;
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CRYPTRELEASECONTEXT release = NULL;
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NETSTATGET netstatget = NULL;
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NETFREE netfree = NULL;
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BYTE buf[64];
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if (netapi) {
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netstatget =
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(NETSTATGET) GetProcAddress(netapi, "NetStatisticsGet");
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netfree = (NETFREE) GetProcAddress(netapi, "NetApiBufferFree");
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}
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if (netstatget && netfree) {
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LPBYTE outbuf;
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/*
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* NetStatisticsGet() is a Unicode only function
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* STAT_WORKSTATION_0 contains 45 fields and STAT_SERVER_0
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* contains 17 fields. We treat each field as a source of one
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* byte of entropy.
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*/
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if (netstatget(NULL, L"LanmanWorkstation", 0, 0, &outbuf) == 0) {
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RAND_add(outbuf, sizeof(STAT_WORKSTATION_0), 45);
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netfree(outbuf);
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}
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if (netstatget(NULL, L"LanmanServer", 0, 0, &outbuf) == 0) {
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RAND_add(outbuf, sizeof(STAT_SERVER_0), 17);
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netfree(outbuf);
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}
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}
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if (netapi)
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FreeLibrary(netapi);
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/*
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* It appears like this can cause an exception deep within
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* ADVAPI32.DLL at random times on Windows 2000. Reported by Jeffrey
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* Altman. Only use it on NT.
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*/
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if (advapi) {
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/*
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* If it's available, then it's available in both ANSI
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* and UNICODE flavors even in Win9x, documentation says.
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* We favor Unicode...
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*/
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acquire = (CRYPTACQUIRECONTEXTW) GetProcAddress(advapi,
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"CryptAcquireContextW");
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gen = (CRYPTGENRANDOM) GetProcAddress(advapi, "CryptGenRandom");
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release = (CRYPTRELEASECONTEXT) GetProcAddress(advapi,
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"CryptReleaseContext");
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}
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if (acquire && gen && release) {
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/* poll the CryptoAPI PRNG */
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/* The CryptoAPI returns sizeof(buf) bytes of randomness */
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if (acquire(&hProvider, NULL, NULL, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT)) {
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if (gen(hProvider, sizeof(buf), buf) != 0) {
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RAND_add(buf, sizeof(buf), 0);
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good = 1;
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}
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release(hProvider, 0);
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}
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/* poll the Pentium PRG with CryptoAPI */
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if (acquire(&hProvider, 0, INTEL_DEF_PROV, PROV_INTEL_SEC, 0)) {
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if (gen(hProvider, sizeof(buf), buf) != 0) {
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RAND_add(buf, sizeof(buf), sizeof(buf));
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good = 1;
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}
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release(hProvider, 0);
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}
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}
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if (advapi)
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FreeLibrary(advapi);
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if ((!check_winnt() ||
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!OPENSSL_isservice()) &&
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(user = LoadLibrary(TEXT("USER32.DLL")))) {
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GETCURSORINFO cursor;
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GETFOREGROUNDWINDOW win;
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GETQUEUESTATUS queue;
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win =
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(GETFOREGROUNDWINDOW) GetProcAddress(user,
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"GetForegroundWindow");
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cursor = (GETCURSORINFO) GetProcAddress(user, "GetCursorInfo");
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queue = (GETQUEUESTATUS) GetProcAddress(user, "GetQueueStatus");
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if (win) {
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/* window handle */
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HWND h = win();
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RAND_add(&h, sizeof(h), 0);
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}
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if (cursor) {
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/*
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* unfortunately, its not safe to call GetCursorInfo() on NT4
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* even though it exists in SP3 (or SP6) and higher.
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*/
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if (check_winnt() && !check_win_minplat(5))
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cursor = 0;
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}
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if (cursor) {
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/* cursor position */
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/* assume 2 bytes of entropy */
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CURSORINFO ci;
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ci.cbSize = sizeof(CURSORINFO);
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if (cursor(&ci))
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RAND_add(&ci, ci.cbSize, 2);
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}
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if (queue) {
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/* message queue status */
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/* assume 1 byte of entropy */
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w = queue(QS_ALLEVENTS);
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RAND_add(&w, sizeof(w), 1);
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}
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FreeLibrary(user);
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}
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/*-
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* Toolhelp32 snapshot: enumerate processes, threads, modules and heap
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* http://msdn.microsoft.com/library/psdk/winbase/toolhelp_5pfd.htm
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* (Win 9x and 2000 only, not available on NT)
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*
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* This seeding method was proposed in Peter Gutmann, Software
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* Generation of Practically Strong Random Numbers,
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* http://www.usenix.org/publications/library/proceedings/sec98/gutmann.html
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* revised version at http://www.cryptoengines.com/~peter/06_random.pdf
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* (The assignment of entropy estimates below is arbitrary, but based
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* on Peter's analysis the full poll appears to be safe. Additional
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* interactive seeding is encouraged.)
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*/
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if (kernel) {
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CREATETOOLHELP32SNAPSHOT snap;
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CLOSETOOLHELP32SNAPSHOT close_snap;
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HANDLE handle;
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HEAP32FIRST heap_first;
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HEAP32NEXT heap_next;
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HEAP32LIST heaplist_first, heaplist_next;
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PROCESS32 process_first, process_next;
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THREAD32 thread_first, thread_next;
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MODULE32 module_first, module_next;
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HEAPLIST32 hlist;
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HEAPENTRY32 hentry;
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PROCESSENTRY32 p;
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THREADENTRY32 t;
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MODULEENTRY32 m;
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DWORD starttime = 0;
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snap = (CREATETOOLHELP32SNAPSHOT)
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GetProcAddress(kernel, "CreateToolhelp32Snapshot");
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close_snap = (CLOSETOOLHELP32SNAPSHOT)
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GetProcAddress(kernel, "CloseToolhelp32Snapshot");
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heap_first = (HEAP32FIRST) GetProcAddress(kernel, "Heap32First");
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heap_next = (HEAP32NEXT) GetProcAddress(kernel, "Heap32Next");
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heaplist_first =
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(HEAP32LIST) GetProcAddress(kernel, "Heap32ListFirst");
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heaplist_next =
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(HEAP32LIST) GetProcAddress(kernel, "Heap32ListNext");
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process_first =
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(PROCESS32) GetProcAddress(kernel, "Process32First");
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process_next =
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(PROCESS32) GetProcAddress(kernel, "Process32Next");
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thread_first = (THREAD32) GetProcAddress(kernel, "Thread32First");
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thread_next = (THREAD32) GetProcAddress(kernel, "Thread32Next");
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module_first = (MODULE32) GetProcAddress(kernel, "Module32First");
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module_next = (MODULE32) GetProcAddress(kernel, "Module32Next");
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if (snap && heap_first && heap_next && heaplist_first &&
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heaplist_next && process_first && process_next &&
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thread_first && thread_next && module_first &&
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module_next && (handle = snap(TH32CS_SNAPALL, 0))
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!= INVALID_HANDLE_VALUE) {
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/* heap list and heap walking */
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/*
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* HEAPLIST32 contains 3 fields that will change with each
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* entry. Consider each field a source of 1 byte of entropy.
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* HEAPENTRY32 contains 5 fields that will change with each
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* entry. Consider each field a source of 1 byte of entropy.
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*/
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ZeroMemory(&hlist, sizeof(HEAPLIST32));
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hlist.dwSize = sizeof(HEAPLIST32);
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if (good)
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starttime = GetTickCount();
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# ifdef _MSC_VER
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if (heaplist_first(handle, &hlist)) {
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/*
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* following discussion on dev ML, exception on WinCE (or
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* other Win platform) is theoretically of unknown
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* origin; prevent infinite loop here when this
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* theoretical case occurs; otherwise cope with the
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* expected (MSDN documented) exception-throwing
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* behaviour of Heap32Next() on WinCE.
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*
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* based on patch in original message by Tanguy Fautré
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* (2009/03/02) Subject: RAND_poll() and
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* CreateToolhelp32Snapshot() stability
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*/
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int ex_cnt_limit = 42;
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do {
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RAND_add(&hlist, hlist.dwSize, 3);
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__try {
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ZeroMemory(&hentry, sizeof(HEAPENTRY32));
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hentry.dwSize = sizeof(HEAPENTRY32);
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if (heap_first(&hentry,
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hlist.th32ProcessID,
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hlist.th32HeapID)) {
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int entrycnt = 80;
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do
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RAND_add(&hentry, hentry.dwSize, 5);
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while (heap_next(&hentry)
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&& (!good
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|| (GetTickCount() - starttime) <
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MAXDELAY)
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&& --entrycnt > 0);
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}
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}
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__except(EXCEPTION_EXECUTE_HANDLER) {
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/*
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* ignore access violations when walking the heap
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* list
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*/
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ex_cnt_limit--;
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}
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} while (heaplist_next(handle, &hlist)
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&& (!good
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|| (GetTickCount() - starttime) < MAXDELAY)
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&& ex_cnt_limit > 0);
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}
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# else
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if (heaplist_first(handle, &hlist)) {
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do {
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RAND_add(&hlist, hlist.dwSize, 3);
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hentry.dwSize = sizeof(HEAPENTRY32);
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if (heap_first(&hentry,
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hlist.th32ProcessID,
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hlist.th32HeapID)) {
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int entrycnt = 80;
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do
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RAND_add(&hentry, hentry.dwSize, 5);
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while (heap_next(&hentry)
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&& --entrycnt > 0);
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}
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} while (heaplist_next(handle, &hlist)
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&& (!good
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|| (GetTickCount() - starttime) < MAXDELAY));
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}
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# endif
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/* process walking */
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/*
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* PROCESSENTRY32 contains 9 fields that will change with
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* each entry. Consider each field a source of 1 byte of
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* entropy.
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*/
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p.dwSize = sizeof(PROCESSENTRY32);
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if (good)
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starttime = GetTickCount();
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if (process_first(handle, &p))
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do
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RAND_add(&p, p.dwSize, 9);
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while (process_next(handle, &p)
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&& (!good
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|| (GetTickCount() - starttime) < MAXDELAY));
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/* thread walking */
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/*
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* THREADENTRY32 contains 6 fields that will change with each
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* entry. Consider each field a source of 1 byte of entropy.
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*/
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t.dwSize = sizeof(THREADENTRY32);
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if (good)
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starttime = GetTickCount();
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if (thread_first(handle, &t))
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do
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RAND_add(&t, t.dwSize, 6);
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while (thread_next(handle, &t)
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&& (!good
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|| (GetTickCount() - starttime) < MAXDELAY));
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/* module walking */
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/*
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* MODULEENTRY32 contains 9 fields that will change with each
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* entry. Consider each field a source of 1 byte of entropy.
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*/
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m.dwSize = sizeof(MODULEENTRY32);
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if (good)
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starttime = GetTickCount();
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if (module_first(handle, &m))
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do
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RAND_add(&m, m.dwSize, 9);
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while (module_next(handle, &m)
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&& (!good
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|| (GetTickCount() - starttime) < MAXDELAY));
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if (close_snap)
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close_snap(handle);
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else
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CloseHandle(handle);
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}
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FreeLibrary(kernel);
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}
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}
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# endif /* !OPENSSL_SYS_WINCE */
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/* timer data */
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readtimer();
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/* memory usage statistics */
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GlobalMemoryStatus(&mst);
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RAND_add(&mst, sizeof(mst), 1);
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/* process ID */
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w = GetCurrentProcessId();
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RAND_add(&w, sizeof(w), 1);
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return (1);
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}
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int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
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{
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double add_entropy = 0;
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switch (iMsg) {
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case WM_KEYDOWN:
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{
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static WPARAM key;
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if (key != wParam)
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add_entropy = 0.05;
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key = wParam;
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}
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break;
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case WM_MOUSEMOVE:
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{
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static int lastx, lasty, lastdx, lastdy;
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int x, y, dx, dy;
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x = LOWORD(lParam);
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y = HIWORD(lParam);
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dx = lastx - x;
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dy = lasty - y;
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if (dx != 0 && dy != 0 && dx - lastdx != 0 && dy - lastdy != 0)
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add_entropy = .2;
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lastx = x, lasty = y;
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lastdx = dx, lastdy = dy;
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}
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break;
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}
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readtimer();
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RAND_add(&iMsg, sizeof(iMsg), add_entropy);
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RAND_add(&wParam, sizeof(wParam), 0);
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RAND_add(&lParam, sizeof(lParam), 0);
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return (RAND_status());
|
|
}
|
|
|
|
void RAND_screen(void)
|
|
{ /* function available for backward
|
|
* compatibility */
|
|
RAND_poll();
|
|
readscreen();
|
|
}
|
|
|
|
/* feed timing information to the PRNG */
|
|
static void readtimer(void)
|
|
{
|
|
DWORD w;
|
|
LARGE_INTEGER l;
|
|
static int have_perfc = 1;
|
|
# if defined(_MSC_VER) && defined(_M_X86)
|
|
static int have_tsc = 1;
|
|
DWORD cyclecount;
|
|
|
|
if (have_tsc) {
|
|
__try {
|
|
__asm {
|
|
_emit 0x0f _emit 0x31 mov cyclecount, eax}
|
|
RAND_add(&cyclecount, sizeof(cyclecount), 1);
|
|
}
|
|
__except(EXCEPTION_EXECUTE_HANDLER) {
|
|
have_tsc = 0;
|
|
}
|
|
}
|
|
# else
|
|
# define have_tsc 0
|
|
# endif
|
|
|
|
if (have_perfc) {
|
|
if (QueryPerformanceCounter(&l) == 0)
|
|
have_perfc = 0;
|
|
else
|
|
RAND_add(&l, sizeof(l), 0);
|
|
}
|
|
|
|
if (!have_tsc && !have_perfc) {
|
|
w = GetTickCount();
|
|
RAND_add(&w, sizeof(w), 0);
|
|
}
|
|
}
|
|
|
|
/* feed screen contents to PRNG */
|
|
/*****************************************************************************
|
|
*
|
|
* Created 960901 by Gertjan van Oosten, gertjan@West.NL, West Consulting B.V.
|
|
*
|
|
* Code adapted from
|
|
* <URL:http://support.microsoft.com/default.aspx?scid=kb;[LN];97193>;
|
|
* the original copyright message is:
|
|
*
|
|
* (C) Copyright Microsoft Corp. 1993. All rights reserved.
|
|
*
|
|
* You have a royalty-free right to use, modify, reproduce and
|
|
* distribute the Sample Files (and/or any modified version) in
|
|
* any way you find useful, provided that you agree that
|
|
* Microsoft has no warranty obligations or liability for any
|
|
* Sample Application Files which are modified.
|
|
*/
|
|
|
|
static void readscreen(void)
|
|
{
|
|
# if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN)
|
|
HDC hScrDC; /* screen DC */
|
|
HBITMAP hBitmap; /* handle for our bitmap */
|
|
BITMAP bm; /* bitmap properties */
|
|
unsigned int size; /* size of bitmap */
|
|
char *bmbits; /* contents of bitmap */
|
|
int w; /* screen width */
|
|
int h; /* screen height */
|
|
int y; /* y-coordinate of screen lines to grab */
|
|
int n = 16; /* number of screen lines to grab at a time */
|
|
BITMAPINFOHEADER bi; /* info about the bitmap */
|
|
|
|
if (check_winnt() && OPENSSL_isservice() > 0)
|
|
return;
|
|
|
|
/* Get a reference to the screen DC */
|
|
hScrDC = GetDC(NULL);
|
|
|
|
/* Get screen resolution */
|
|
w = GetDeviceCaps(hScrDC, HORZRES);
|
|
h = GetDeviceCaps(hScrDC, VERTRES);
|
|
|
|
/* Create a bitmap compatible with the screen DC */
|
|
hBitmap = CreateCompatibleBitmap(hScrDC, w, n);
|
|
|
|
/* Get bitmap properties */
|
|
GetObject(hBitmap, sizeof(BITMAP), (LPSTR) & bm);
|
|
size = (unsigned int)bm.bmWidthBytes * bm.bmHeight * bm.bmPlanes;
|
|
|
|
bi.biSize = sizeof(BITMAPINFOHEADER);
|
|
bi.biWidth = bm.bmWidth;
|
|
bi.biHeight = bm.bmHeight;
|
|
bi.biPlanes = bm.bmPlanes;
|
|
bi.biBitCount = bm.bmBitsPixel;
|
|
bi.biCompression = BI_RGB;
|
|
bi.biSizeImage = 0;
|
|
bi.biXPelsPerMeter = 0;
|
|
bi.biYPelsPerMeter = 0;
|
|
bi.biClrUsed = 0;
|
|
bi.biClrImportant = 0;
|
|
|
|
bmbits = OPENSSL_malloc(size);
|
|
if (bmbits != NULL) {
|
|
/* Now go through the whole screen, repeatedly grabbing n lines */
|
|
for (y = 0; y < h - n; y += n) {
|
|
unsigned char md[MD_DIGEST_LENGTH];
|
|
|
|
/* Copy the bits of the current line range into the buffer */
|
|
GetDIBits(hScrDC, hBitmap, y, n,
|
|
bmbits, (BITMAPINFO *) & bi, DIB_RGB_COLORS);
|
|
|
|
/* Get the hash of the bitmap */
|
|
MD(bmbits, size, md);
|
|
|
|
/* Seed the random generator with the hash value */
|
|
RAND_add(md, MD_DIGEST_LENGTH, 0);
|
|
}
|
|
|
|
OPENSSL_free(bmbits);
|
|
}
|
|
|
|
/* Clean up */
|
|
DeleteObject(hBitmap);
|
|
ReleaseDC(NULL, hScrDC);
|
|
# endif /* !OPENSSL_SYS_WINCE */
|
|
}
|
|
|
|
#endif
|