X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Frand%2Frand_win.c;h=73f261f122b2d2a99d8ab35bda243c96c6194d93;hp=163cee02c72829b6fd8081726900a96ca3c6e68a;hb=a4cc3c8041104896d51ae12ef7b678c31808ce52;hpb=9f6fe8dbe70f4ef5a1263cf8f3d6351519373c8f diff --git a/crypto/rand/rand_win.c b/crypto/rand/rand_win.c index 163cee02c7..73f261f122 100644 --- a/crypto/rand/rand_win.c +++ b/crypto/rand/rand_win.c @@ -109,11 +109,13 @@ * */ +#define OPENSSL_FIPSAPI + #include "cryptlib.h" #include #include "rand_lcl.h" -#if defined(WINDOWS) || defined(WIN32) +#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) #include #ifndef _WIN32_WINNT # define _WIN32_WINNT 0x0400 @@ -121,11 +123,15 @@ #include #include +/* Limit the time spent walking through the heap, processes, threads and modules to + a maximum of 1000 miliseconds 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 "Intel Hardware Cryptographic Service Provider" +#define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider" static void readtimer(void); static void readscreen(void); @@ -152,7 +158,8 @@ typedef struct tagCURSORINFO #define CURSOR_SHOWING 0x00000001 #endif /* CURSOR_SHOWING */ -typedef BOOL (WINAPI *CRYPTACQUIRECONTEXT)(HCRYPTPROV *, LPCTSTR, LPCTSTR, +#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); @@ -162,7 +169,8 @@ typedef BOOL (WINAPI *GETCURSORINFO)(PCURSORINFO); typedef DWORD (WINAPI *GETQUEUESTATUS)(UINT); typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD); -typedef BOOL (WINAPI *HEAP32FIRST)(LPHEAPENTRY32, 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); @@ -181,26 +189,14 @@ typedef NET_API_STATUS (NET_API_FUNCTION * NETSTATGET) (LPWSTR, LPWSTR, DWORD, DWORD, LPBYTE*); typedef NET_API_STATUS (NET_API_FUNCTION * NETFREE)(LPBYTE); #endif /* 1 */ +#endif /* !OPENSSL_SYS_WINCE */ int RAND_poll(void) { MEMORYSTATUS m; HCRYPTPROV hProvider = 0; - BYTE buf[64]; DWORD w; - HWND h; - - HMODULE advapi, kernel, user, netapi; - CRYPTACQUIRECONTEXT acquire = 0; - CRYPTGENRANDOM gen = 0; - CRYPTRELEASECONTEXT release = 0; -#if 1 /* There was previously a problem with NETSTATGET. Currently, this - * section is still experimental, but if all goes well, this conditional - * will be removed - */ - NETSTATGET netstatget = 0; - NETFREE netfree = 0; -#endif /* 1 */ + int good = 0; /* Determine the OS version we are on so we can turn off things * that do not work properly. @@ -209,16 +205,50 @@ int RAND_poll(void) osverinfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO) ; GetVersionEx( &osverinfo ) ; +#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 */ - advapi = LoadLibrary("ADVAPI32.DLL"); - kernel = LoadLibrary("KERNEL32.DLL"); - user = LoadLibrary("USER32.DLL"); - netapi = LoadLibrary("NETAPI32.DLL"); - -#if 1 /* There was previously a problem with NETSTATGET. Currently, this - * section is still experimental, but if all goes well, this conditional - * will be removed - */ + 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"); @@ -248,12 +278,15 @@ int RAND_poll(void) if (netapi) FreeLibrary(netapi); -#endif /* 1 */ - + /* 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. */ + /* Wolfgang Marczy reports that + * the RegQueryValueEx call below can hang on NT4.0 (SP6). + * So we don't use this at all for now. */ +#if 0 if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT && osverinfo.dwMajorVersion < 5) { @@ -276,25 +309,40 @@ int RAND_poll(void) bufsz += 8192; length = bufsz; - rc = RegQueryValueEx(HKEY_PERFORMANCE_DATA, "Global", + rc = RegQueryValueEx(HKEY_PERFORMANCE_DATA, TEXT("Global"), NULL, NULL, buf, &length); } if (rc == ERROR_SUCCESS) { /* For entropy count assume only least significant * byte of each DWORD is random. - */ + */ RAND_add(&length, sizeof(length), 0); RAND_add(buf, length, length / 4.0); + + /* Close the Registry Key to allow Windows to cleanup/close + * the open handle + * Note: The 'HKEY_PERFORMANCE_DATA' key is implicitly opened + * when the RegQueryValueEx above is done. However, if + * it is not explicitly closed, it can cause disk + * partition manipulation problems. + */ + RegCloseKey(HKEY_PERFORMANCE_DATA); } if (buf) free(buf); } +#endif if (advapi) { - acquire = (CRYPTACQUIRECONTEXT) GetProcAddress(advapi, - "CryptAcquireContextA"); + /* + * 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, @@ -305,13 +353,14 @@ int RAND_poll(void) { /* poll the CryptoAPI PRNG */ /* The CryptoAPI returns sizeof(buf) bytes of randomness */ - if (acquire(&hProvider, 0, 0, PROV_RSA_FULL, + if (acquire(&hProvider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) { if (gen(hProvider, sizeof(buf), buf) != 0) { - RAND_add(buf, sizeof(buf), sizeof(buf)); -#ifdef DEBUG + RAND_add(buf, sizeof(buf), 0); + good = 1; +#if 0 printf("randomness from PROV_RSA_FULL\n"); #endif } @@ -324,7 +373,8 @@ int RAND_poll(void) if (gen(hProvider, sizeof(buf), buf) != 0) { RAND_add(buf, sizeof(buf), sizeof(buf)); -#ifdef DEBUG + good = 1; +#if 0 printf("randomness from PROV_INTEL_SEC\n"); #endif } @@ -335,18 +385,9 @@ int RAND_poll(void) if (advapi) FreeLibrary(advapi); - /* timer data */ - readtimer(); - - /* memory usage statistics */ - GlobalMemoryStatus(&m); - RAND_add(&m, sizeof(m), 1); - - /* process ID */ - w = GetCurrentProcessId(); - RAND_add(&w, sizeof(w), 1); - - if (user) + if ((osverinfo.dwPlatformId != VER_PLATFORM_WIN32_NT || + !OPENSSL_isservice()) && + (user = LoadLibrary(TEXT("USER32.DLL")))) { GETCURSORINFO cursor; GETFOREGROUNDWINDOW win; @@ -359,7 +400,7 @@ int RAND_poll(void) if (win) { /* window handle */ - h = win(); + HWND h = win(); RAND_add(&h, sizeof(h), 0); } if (cursor) @@ -400,7 +441,7 @@ int RAND_poll(void) * This seeding method was proposed in Peter Gutmann, Software * Generation of Practically Strong Random Numbers, * http://www.usenix.org/publications/library/proceedings/sec98/gutmann.html - * revised version at http://www.cryptoengines.com/~peter/06_random.pdf + * revised version at http://www.cryptoengines.com/~peter/06_random.pdf * (The assignment of entropy estimates below is arbitrary, but based * on Peter's analysis the full poll appears to be safe. Additional * interactive seeding is encouraged.) @@ -409,6 +450,7 @@ int RAND_poll(void) if (kernel) { CREATETOOLHELP32SNAPSHOT snap; + CLOSETOOLHELP32SNAPSHOT close_snap; HANDLE handle; HEAP32FIRST heap_first; @@ -423,9 +465,12 @@ int RAND_poll(void) PROCESSENTRY32 p; THREADENTRY32 t; MODULEENTRY32 m; + DWORD starttime = 0; snap = (CREATETOOLHELP32SNAPSHOT) GetProcAddress(kernel, "CreateToolhelp32Snapshot"); + close_snap = (CLOSETOOLHELP32SNAPSHOT) + GetProcAddress(kernel, "CloseToolhelp32Snapshot"); heap_first = (HEAP32FIRST) GetProcAddress(kernel, "Heap32First"); heap_next = (HEAP32NEXT) GetProcAddress(kernel, "Heap32Next"); heaplist_first = (HEAP32LIST) GetProcAddress(kernel, "Heap32ListFirst"); @@ -441,7 +486,7 @@ int RAND_poll(void) heaplist_next && process_first && process_next && thread_first && thread_next && module_first && module_next && (handle = snap(TH32CS_SNAPALL,0)) - != NULL) + != INVALID_HANDLE_VALUE) { /* heap list and heap walking */ /* HEAPLIST32 contains 3 fields that will change with @@ -451,11 +496,29 @@ int RAND_poll(void) * each entry. Consider each field a source of 1 byte * of entropy. */ + ZeroMemory(&hlist, sizeof(HEAPLIST32)); hlist.dwSize = sizeof(HEAPLIST32); + if (good) starttime = GetTickCount(); +#ifdef _MSC_VER if (heaplist_first(handle, &hlist)) + { + /* + following discussion on dev ML, exception on WinCE (or other Win + platform) is theoretically of unknown origin; prevent infinite + loop here when this theoretical case occurs; otherwise cope with + the expected (MSDN documented) exception-throwing behaviour of + Heap32Next() on WinCE. + + based on patch in original message by Tanguy Fautré (2009/03/02) + Subject: RAND_poll() and CreateToolhelp32Snapshot() stability + */ + int ex_cnt_limit = 42; do { RAND_add(&hlist, hlist.dwSize, 3); + __try + { + ZeroMemory(&hentry, sizeof(HEAPENTRY32)); hentry.dwSize = sizeof(HEAPENTRY32); if (heap_first(&hentry, hlist.th32ProcessID, @@ -466,21 +529,55 @@ int RAND_poll(void) RAND_add(&hentry, hentry.dwSize, 5); while (heap_next(&hentry) + && (!good || (GetTickCount()-starttime) 0); } - } while (heaplist_next(handle, - &hlist)); - + } + __except (EXCEPTION_EXECUTE_HANDLER) + { + /* ignore access violations when walking the heap list */ + ex_cnt_limit--; + } + } while (heaplist_next(handle, &hlist) + && (!good || (GetTickCount()-starttime) 0); + } + +#else + if (heaplist_first(handle, &hlist)) + { + do + { + RAND_add(&hlist, hlist.dwSize, 3); + hentry.dwSize = sizeof(HEAPENTRY32); + if (heap_first(&hentry, + hlist.th32ProcessID, + hlist.th32HeapID)) + { + int entrycnt = 80; + do + RAND_add(&hentry, + hentry.dwSize, 5); + while (heap_next(&hentry) + && --entrycnt > 0); + } + } while (heaplist_next(handle, &hlist) + && (!good || (GetTickCount()-starttime); + * ; * the original copyright message is: * * (C) Copyright Microsoft Corp. 1993. All rights reserved. @@ -622,6 +739,7 @@ static void readtimer(void) static void readscreen(void) { +#if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN) HDC hScrDC; /* screen DC */ HDC hMemDC; /* memory DC */ HBITMAP hBitmap; /* handle for our bitmap */ @@ -634,8 +752,11 @@ static void readscreen(void) int y; /* y-coordinate of screen lines to grab */ int n = 16; /* number of screen lines to grab at a time */ + if (check_winnt() && OPENSSL_isservice()>0) + return; + /* Create a screen DC and a memory DC compatible to screen DC */ - hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL); + hScrDC = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL); hMemDC = CreateCompatibleDC(hScrDC); /* Get screen resolution */ @@ -682,51 +803,7 @@ static void readscreen(void) DeleteObject(hBitmap); DeleteDC(hMemDC); DeleteDC(hScrDC); -} - -#else /* Unix version */ - -#include - -int RAND_poll(void) -{ - unsigned long l; - pid_t curr_pid = getpid(); -#ifdef DEVRANDOM - FILE *fh; -#endif - -#ifdef DEVRANDOM - /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD - * have this. Use /dev/urandom if you can as /dev/random may block - * if it runs out of random entries. */ - - if ((fh = fopen(DEVRANDOM, "r")) != NULL) - { - unsigned char tmpbuf[ENTROPY_NEEDED]; - int n; - - setvbuf(fh, NULL, _IONBF, 0); - n=fread((unsigned char *)tmpbuf,1,ENTROPY_NEEDED,fh); - fclose(fh); - RAND_add(tmpbuf,sizeof tmpbuf,n); - memset(tmpbuf,0,n); - } -#endif - - /* put in some default random data, we need more than just this */ - l=curr_pid; - RAND_add(&l,sizeof(l),0); - l=getuid(); - RAND_add(&l,sizeof(l),0); - - l=time(NULL); - RAND_add(&l,sizeof(l),0); - -#ifdef DEVRANDOM - return 1; -#endif - return 0; +#endif /* !OPENSSL_SYS_WINCE */ } #endif