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openssl/crypto/cryptlib.c

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/*
* Copyright 1998-2019 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2002, Oracle and/or its affiliates. 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 "e_os.h"
#include "crypto/cryptlib.h"
#include <openssl/safestack.h>
#if defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
defined(__x86_64) || defined(__x86_64__) || \
defined(_M_AMD64) || defined(_M_X64)
extern unsigned int OPENSSL_ia32cap_P[4];
# if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM) && !defined(I386_ONLY)
/*
* Purpose of these minimalistic and character-type-agnostic subroutines
* is to break dependency on MSVCRT (on Windows) and locale. This makes
* OPENSSL_cpuid_setup safe to use as "constructor". "Character-type-
* agnostic" means that they work with either wide or 8-bit characters,
* exploiting the fact that first 127 characters can be simply casted
* between the sets, while the rest would be simply rejected by ossl_is*
* subroutines.
*/
# ifdef _WIN32
typedef WCHAR variant_char;
static variant_char *ossl_getenv(const char *name)
{
/*
* Since we pull only one environment variable, it's simpler to
* to just ignore |name| and use equivalent wide-char L-literal.
* As well as to ignore excessively long values...
*/
static WCHAR value[48];
DWORD len = GetEnvironmentVariableW(L"OPENSSL_ia32cap", value, 48);
return (len > 0 && len < 48) ? value : NULL;
}
# else
typedef char variant_char;
# define ossl_getenv getenv
# endif
# include "crypto/ctype.h"
static int todigit(variant_char c)
{
if (ossl_isdigit(c))
return c - '0';
else if (ossl_isxdigit(c))
return ossl_tolower(c) - 'a' + 10;
/* return largest base value to make caller terminate the loop */
return 16;
}
static uint64_t ossl_strtouint64(const variant_char *str)
{
uint64_t ret = 0;
unsigned int digit, base = 10;
if (*str == '0') {
base = 8, str++;
if (ossl_tolower(*str) == 'x')
base = 16, str++;
}
while((digit = todigit(*str++)) < base)
ret = ret * base + digit;
return ret;
}
static variant_char *ossl_strchr(const variant_char *str, char srch)
{ variant_char c;
while((c = *str)) {
if (c == srch)
return (variant_char *)str;
str++;
}
return NULL;
}
# define OPENSSL_CPUID_SETUP
typedef uint64_t IA32CAP;
void OPENSSL_cpuid_setup(void)
{
static int trigger = 0;
IA32CAP OPENSSL_ia32_cpuid(unsigned int *);
IA32CAP vec;
const variant_char *env;
if (trigger)
return;
trigger = 1;
if ((env = ossl_getenv("OPENSSL_ia32cap")) != NULL) {
int off = (env[0] == '~') ? 1 : 0;
vec = ossl_strtouint64(env + off);
if (off) {
IA32CAP mask = vec;
vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P) & ~mask;
if (mask & (1<<24)) {
/*
* User disables FXSR bit, mask even other capabilities
* that operate exclusively on XMM, so we don't have to
* double-check all the time. We mask PCLMULQDQ, AMD XOP,
* AES-NI and AVX. Formally speaking we don't have to
* do it in x86_64 case, but we can safely assume that
* x86_64 users won't actually flip this flag.
*/
vec &= ~((IA32CAP)(1<<1|1<<11|1<<25|1<<28) << 32);
}
} else if (env[0] == ':') {
vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
}
if ((env = ossl_strchr(env, ':')) != NULL) {
IA32CAP vecx;
env++;
off = (env[0] == '~') ? 1 : 0;
vecx = ossl_strtouint64(env + off);
if (off) {
OPENSSL_ia32cap_P[2] &= ~(unsigned int)vecx;
OPENSSL_ia32cap_P[3] &= ~(unsigned int)(vecx >> 32);
} else {
OPENSSL_ia32cap_P[2] = (unsigned int)vecx;
OPENSSL_ia32cap_P[3] = (unsigned int)(vecx >> 32);
}
} else {
OPENSSL_ia32cap_P[2] = 0;
OPENSSL_ia32cap_P[3] = 0;
}
} else {
vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
}
/*
* |(1<<10) sets a reserved bit to signal that variable
* was initialized already... This is to avoid interference
* with cpuid snippets in ELF .init segment.
*/
OPENSSL_ia32cap_P[0] = (unsigned int)vec | (1 << 10);
OPENSSL_ia32cap_P[1] = (unsigned int)(vec >> 32);
}
# else
unsigned int OPENSSL_ia32cap_P[4];
# endif
#endif
#if !defined(OPENSSL_CPUID_SETUP) && !defined(OPENSSL_CPUID_OBJ)
void OPENSSL_cpuid_setup(void)
{
}
#endif
#if defined(_WIN32)
# include <tchar.h>
# include <signal.h>
# ifdef __WATCOMC__
# if defined(_UNICODE) || defined(__UNICODE__)
# define _vsntprintf _vsnwprintf
# else
# define _vsntprintf _vsnprintf
# endif
# endif
# ifdef _MSC_VER
# define alloca _alloca
# endif
# if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
# ifdef OPENSSL_SYS_WIN_CORE
int OPENSSL_isservice(void)
{
/* OneCore API cannot interact with GUI */
return 1;
}
# else
int OPENSSL_isservice(void)
{
HWINSTA h;
DWORD len;
WCHAR *name;
static union {
void *p;
FARPROC f;
} _OPENSSL_isservice = {
NULL
};
if (_OPENSSL_isservice.p == NULL) {
HANDLE mod = GetModuleHandle(NULL);
FARPROC f = NULL;
if (mod != NULL)
f = GetProcAddress(mod, "_OPENSSL_isservice");
if (f == NULL)
_OPENSSL_isservice.p = (void *)-1;
else
_OPENSSL_isservice.f = f;
}
if (_OPENSSL_isservice.p != (void *)-1)
return (*_OPENSSL_isservice.f) ();
h = GetProcessWindowStation();
if (h == NULL)
return -1;
if (GetUserObjectInformationW(h, UOI_NAME, NULL, 0, &len) ||
GetLastError() != ERROR_INSUFFICIENT_BUFFER)
return -1;
if (len > 512)
return -1; /* paranoia */
len++, len &= ~1; /* paranoia */
name = (WCHAR *)alloca(len + sizeof(WCHAR));
if (!GetUserObjectInformationW(h, UOI_NAME, name, len, &len))
return -1;
len++, len &= ~1; /* paranoia */
name[len / sizeof(WCHAR)] = L'\0'; /* paranoia */
# if 1
/*
* This doesn't cover "interactive" services [working with real
* WinSta0's] nor programs started non-interactively by Task Scheduler
* [those are working with SAWinSta].
*/
if (wcsstr(name, L"Service-0x"))
return 1;
# else
/* This covers all non-interactive programs such as services. */
if (!wcsstr(name, L"WinSta0"))
return 1;
# endif
else
return 0;
}
# endif
# else
int OPENSSL_isservice(void)
{
return 0;
}
# endif
void OPENSSL_showfatal(const char *fmta, ...)
{
va_list ap;
TCHAR buf[256];
const TCHAR *fmt;
/*
* First check if it's a console application, in which case the
* error message would be printed to standard error.
* Windows CE does not have a concept of a console application,
* so we need to guard the check.
*/
# ifdef STD_ERROR_HANDLE
HANDLE h;
if ((h = GetStdHandle(STD_ERROR_HANDLE)) != NULL &&
GetFileType(h) != FILE_TYPE_UNKNOWN) {
/* must be console application */
int len;
DWORD out;
va_start(ap, fmta);
len = _vsnprintf((char *)buf, sizeof(buf), fmta, ap);
WriteFile(h, buf, len < 0 ? sizeof(buf) : (DWORD) len, &out, NULL);
va_end(ap);
return;
}
# endif
if (sizeof(TCHAR) == sizeof(char))
fmt = (const TCHAR *)fmta;
else
do {
int keepgoing;
size_t len_0 = strlen(fmta) + 1, i;
WCHAR *fmtw;
fmtw = (WCHAR *)alloca(len_0 * sizeof(WCHAR));
if (fmtw == NULL) {
fmt = (const TCHAR *)L"no stack?";
break;
}
if (!MultiByteToWideChar(CP_ACP, 0, fmta, len_0, fmtw, len_0))
for (i = 0; i < len_0; i++)
fmtw[i] = (WCHAR)fmta[i];
for (i = 0; i < len_0; i++) {
if (fmtw[i] == L'%')
do {
keepgoing = 0;
switch (fmtw[i + 1]) {
case L'0':
case L'1':
case L'2':
case L'3':
case L'4':
case L'5':
case L'6':
case L'7':
case L'8':
case L'9':
case L'.':
case L'*':
case L'-':
i++;
keepgoing = 1;
break;
case L's':
fmtw[i + 1] = L'S';
break;
case L'S':
fmtw[i + 1] = L's';
break;
case L'c':
fmtw[i + 1] = L'C';
break;
case L'C':
fmtw[i + 1] = L'c';
break;
}
} while (keepgoing);
}
fmt = (const TCHAR *)fmtw;
} while (0);
va_start(ap, fmta);
_vsntprintf(buf, OSSL_NELEM(buf) - 1, fmt, ap);
buf[OSSL_NELEM(buf) - 1] = _T('\0');
va_end(ap);
# if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
# ifdef OPENSSL_SYS_WIN_CORE
/* ONECORE is always NONGUI and NT >= 0x0601 */
/*
* TODO: (For non GUI and no std error cases)
* Add event logging feature here.
*/
# if !defined(NDEBUG)
/*
* We are in a situation where we tried to report a critical
* error and this failed for some reason. As a last resort,
* in debug builds, send output to the debugger or any other
* tool like DebugView which can monitor the output.
*/
OutputDebugString(buf);
# endif
# else
/* this -------------v--- guards NT-specific calls */
if (check_winnt() && OPENSSL_isservice() > 0) {
HANDLE hEventLog = RegisterEventSource(NULL, _T("OpenSSL"));
if (hEventLog != NULL) {
const TCHAR *pmsg = buf;
if (!ReportEvent(hEventLog, EVENTLOG_ERROR_TYPE, 0, 0, NULL,
1, 0, &pmsg, NULL)) {
# if !defined(NDEBUG)
/*
* We are in a situation where we tried to report a critical
* error and this failed for some reason. As a last resort,
* in debug builds, send output to the debugger or any other
* tool like DebugView which can monitor the output.
*/
OutputDebugString(pmsg);
# endif
}
(void)DeregisterEventSource(hEventLog);
}
} else {
MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK | MB_ICONERROR);
}
# endif
# else
MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK | MB_ICONERROR);
# endif
}
#else
void OPENSSL_showfatal(const char *fmta, ...)
{
#ifndef OPENSSL_NO_STDIO
va_list ap;
va_start(ap, fmta);
vfprintf(stderr, fmta, ap);
va_end(ap);
#endif
}
int OPENSSL_isservice(void)
{
return 0;
}
#endif
void OPENSSL_die(const char *message, const char *file, int line)
{
OPENSSL_showfatal("%s:%d: OpenSSL internal error: %s\n",
file, line, message);
#if !defined(_WIN32)
abort();
#else
/*
* Win32 abort() customarily shows a dialog, but we just did that...
*/
# if !defined(_WIN32_WCE)
raise(SIGABRT);
# endif
_exit(3);
#endif
}
#if !defined(OPENSSL_CPUID_OBJ)
/*
* The volatile is used to to ensure that the compiler generates code that reads
* all values from the array and doesn't try to optimize this away. The standard
* doesn't actually require this behavior if the original data pointed to is
* not volatile, but compilers do this in practice anyway.
*
* There are also assembler versions of this function.
*/
# undef CRYPTO_memcmp
int CRYPTO_memcmp(const void * in_a, const void * in_b, size_t len)
{
size_t i;
const volatile unsigned char *a = in_a;
const volatile unsigned char *b = in_b;
unsigned char x = 0;
for (i = 0; i < len; i++)
x |= a[i] ^ b[i];
return x;
}
/*
* For systems that don't provide an instruction counter register or equivalent.
*/
uint32_t OPENSSL_rdtsc(void)
{
return 0;
}
size_t OPENSSL_instrument_bus(unsigned int *out, size_t cnt)
{
return 0;
}
size_t OPENSSL_instrument_bus2(unsigned int *out, size_t cnt, size_t max)
{
return 0;
}
#endif
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