| 1 | /*
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| 2 | * Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /* ====================================================================
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| 11 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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| 12 | * ECDH support in OpenSSL originally developed by
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| 13 | * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
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| 14 | */
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| 15 |
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| 16 | #include "internal/cryptlib_int.h"
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| 17 | #include <openssl/safestack.h>
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| 18 |
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| 19 | #if defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
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| 20 | defined(__x86_64) || defined(__x86_64__) || \
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| 21 | defined(_M_AMD64) || defined(_M_X64)
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| 22 |
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| 23 | extern unsigned int OPENSSL_ia32cap_P[4];
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| 24 |
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| 25 | # if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM) && !defined(I386_ONLY)
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| 26 | #include <stdio.h>
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| 27 | # define OPENSSL_CPUID_SETUP
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| 28 | typedef uint64_t IA32CAP;
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| 29 | void OPENSSL_cpuid_setup(void)
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| 30 | {
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| 31 | static int trigger = 0;
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| 32 | IA32CAP OPENSSL_ia32_cpuid(unsigned int *);
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| 33 | IA32CAP vec;
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| 34 | char *env;
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| 35 |
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| 36 | if (trigger)
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| 37 | return;
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| 38 |
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| 39 | trigger = 1;
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| 40 | if ((env = getenv("OPENSSL_ia32cap"))) {
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| 41 | int off = (env[0] == '~') ? 1 : 0;
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| 42 | # if defined(_WIN32)
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| 43 | if (!sscanf(env + off, "%I64i", &vec))
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| 44 | vec = strtoul(env + off, NULL, 0);
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| 45 | # else
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| 46 | if (!sscanf(env + off, "%lli", (long long *)&vec))
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| 47 | vec = strtoul(env + off, NULL, 0);
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| 48 | # endif
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| 49 | if (off) {
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| 50 | IA32CAP mask = vec;
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| 51 | vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P) & ~mask;
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| 52 | if (mask & (1<<24)) {
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| 53 | /*
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| 54 | * User disables FXSR bit, mask even other capabilities
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| 55 | * that operate exclusively on XMM, so we don't have to
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| 56 | * double-check all the time. We mask PCLMULQDQ, AMD XOP,
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| 57 | * AES-NI and AVX. Formally speaking we don't have to
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| 58 | * do it in x86_64 case, but we can safely assume that
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| 59 | * x86_64 users won't actually flip this flag.
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| 60 | */
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| 61 | vec &= ~((IA32CAP)(1<<1|1<<11|1<<25|1<<28) << 32);
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| 62 | }
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| 63 | } else if (env[0] == ':') {
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| 64 | vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
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| 65 | }
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| 66 |
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| 67 | if ((env = strchr(env, ':'))) {
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| 68 | unsigned int vecx;
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| 69 | env++;
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| 70 | off = (env[0] == '~') ? 1 : 0;
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| 71 | vecx = strtoul(env + off, NULL, 0);
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| 72 | if (off)
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| 73 | OPENSSL_ia32cap_P[2] &= ~vecx;
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| 74 | else
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| 75 | OPENSSL_ia32cap_P[2] = vecx;
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| 76 | } else {
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| 77 | OPENSSL_ia32cap_P[2] = 0;
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| 78 | }
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| 79 | } else {
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| 80 | vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
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| 81 | }
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| 82 |
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| 83 | /*
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| 84 | * |(1<<10) sets a reserved bit to signal that variable
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| 85 | * was initialized already... This is to avoid interference
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| 86 | * with cpuid snippets in ELF .init segment.
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| 87 | */
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| 88 | OPENSSL_ia32cap_P[0] = (unsigned int)vec | (1 << 10);
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| 89 | OPENSSL_ia32cap_P[1] = (unsigned int)(vec >> 32);
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| 90 | }
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| 91 | # else
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| 92 | unsigned int OPENSSL_ia32cap_P[4];
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| 93 | # endif
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| 94 | #endif
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| 95 | int OPENSSL_NONPIC_relocated = 0;
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| 96 | #if !defined(OPENSSL_CPUID_SETUP) && !defined(OPENSSL_CPUID_OBJ)
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| 97 | void OPENSSL_cpuid_setup(void)
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| 98 | {
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| 99 | }
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| 100 | #endif
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| 101 |
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| 102 | #if defined(_WIN32) && !defined(__CYGWIN__)
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| 103 | # include <tchar.h>
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| 104 | # include <signal.h>
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| 105 | # ifdef __WATCOMC__
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| 106 | # if defined(_UNICODE) || defined(__UNICODE__)
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| 107 | # define _vsntprintf _vsnwprintf
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| 108 | # else
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| 109 | # define _vsntprintf _vsnprintf
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| 110 | # endif
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| 111 | # endif
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| 112 | # ifdef _MSC_VER
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| 113 | # define alloca _alloca
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| 114 | # endif
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| 115 |
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| 116 | # if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
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| 117 | int OPENSSL_isservice(void)
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| 118 | {
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| 119 | HWINSTA h;
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| 120 | DWORD len;
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| 121 | WCHAR *name;
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| 122 | static union {
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| 123 | void *p;
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| 124 | FARPROC f;
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| 125 | } _OPENSSL_isservice = {
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| 126 | NULL
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| 127 | };
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| 128 |
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| 129 | if (_OPENSSL_isservice.p == NULL) {
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| 130 | HANDLE mod = GetModuleHandle(NULL);
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| 131 | if (mod != NULL)
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| 132 | _OPENSSL_isservice.f = GetProcAddress(mod, "_OPENSSL_isservice");
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| 133 | if (_OPENSSL_isservice.p == NULL)
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| 134 | _OPENSSL_isservice.p = (void *)-1;
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| 135 | }
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| 136 |
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| 137 | if (_OPENSSL_isservice.p != (void *)-1)
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| 138 | return (*_OPENSSL_isservice.f) ();
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| 139 |
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| 140 | h = GetProcessWindowStation();
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| 141 | if (h == NULL)
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| 142 | return -1;
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| 143 |
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| 144 | if (GetUserObjectInformationW(h, UOI_NAME, NULL, 0, &len) ||
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| 145 | GetLastError() != ERROR_INSUFFICIENT_BUFFER)
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| 146 | return -1;
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| 147 |
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| 148 | if (len > 512)
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| 149 | return -1; /* paranoia */
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| 150 | len++, len &= ~1; /* paranoia */
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| 151 | name = (WCHAR *)alloca(len + sizeof(WCHAR));
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| 152 | if (!GetUserObjectInformationW(h, UOI_NAME, name, len, &len))
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| 153 | return -1;
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| 154 |
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| 155 | len++, len &= ~1; /* paranoia */
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| 156 | name[len / sizeof(WCHAR)] = L'\0'; /* paranoia */
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| 157 | # if 1
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| 158 | /*
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| 159 | * This doesn't cover "interactive" services [working with real
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| 160 | * WinSta0's] nor programs started non-interactively by Task Scheduler
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| 161 | * [those are working with SAWinSta].
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| 162 | */
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| 163 | if (wcsstr(name, L"Service-0x"))
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| 164 | return 1;
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| 165 | # else
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| 166 | /* This covers all non-interactive programs such as services. */
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| 167 | if (!wcsstr(name, L"WinSta0"))
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| 168 | return 1;
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| 169 | # endif
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| 170 | else
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| 171 | return 0;
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| 172 | }
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| 173 | # else
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| 174 | int OPENSSL_isservice(void)
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| 175 | {
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| 176 | return 0;
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| 177 | }
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| 178 | # endif
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| 179 |
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| 180 | void OPENSSL_showfatal(const char *fmta, ...)
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| 181 | {
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| 182 | va_list ap;
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| 183 | TCHAR buf[256];
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| 184 | const TCHAR *fmt;
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| 185 | # ifdef STD_ERROR_HANDLE /* what a dirty trick! */
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| 186 | HANDLE h;
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| 187 |
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| 188 | if ((h = GetStdHandle(STD_ERROR_HANDLE)) != NULL &&
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| 189 | GetFileType(h) != FILE_TYPE_UNKNOWN) {
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| 190 | /* must be console application */
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| 191 | int len;
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| 192 | DWORD out;
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| 193 |
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| 194 | va_start(ap, fmta);
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| 195 | len = _vsnprintf((char *)buf, sizeof(buf), fmta, ap);
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| 196 | WriteFile(h, buf, len < 0 ? sizeof(buf) : (DWORD) len, &out, NULL);
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| 197 | va_end(ap);
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| 198 | return;
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| 199 | }
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| 200 | # endif
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| 201 |
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| 202 | if (sizeof(TCHAR) == sizeof(char))
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| 203 | fmt = (const TCHAR *)fmta;
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| 204 | else
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| 205 | do {
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| 206 | int keepgoing;
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| 207 | size_t len_0 = strlen(fmta) + 1, i;
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| 208 | WCHAR *fmtw;
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| 209 |
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| 210 | fmtw = (WCHAR *)alloca(len_0 * sizeof(WCHAR));
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| 211 | if (fmtw == NULL) {
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| 212 | fmt = (const TCHAR *)L"no stack?";
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| 213 | break;
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| 214 | }
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| 215 | if (!MultiByteToWideChar(CP_ACP, 0, fmta, len_0, fmtw, len_0))
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| 216 | for (i = 0; i < len_0; i++)
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| 217 | fmtw[i] = (WCHAR)fmta[i];
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| 218 | for (i = 0; i < len_0; i++) {
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| 219 | if (fmtw[i] == L'%')
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| 220 | do {
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| 221 | keepgoing = 0;
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| 222 | switch (fmtw[i + 1]) {
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| 223 | case L'0':
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| 224 | case L'1':
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| 225 | case L'2':
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| 226 | case L'3':
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| 227 | case L'4':
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| 228 | case L'5':
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| 229 | case L'6':
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| 230 | case L'7':
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| 231 | case L'8':
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| 232 | case L'9':
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| 233 | case L'.':
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| 234 | case L'*':
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| 235 | case L'-':
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| 236 | i++;
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| 237 | keepgoing = 1;
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| 238 | break;
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| 239 | case L's':
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| 240 | fmtw[i + 1] = L'S';
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| 241 | break;
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| 242 | case L'S':
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| 243 | fmtw[i + 1] = L's';
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| 244 | break;
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| 245 | case L'c':
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| 246 | fmtw[i + 1] = L'C';
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| 247 | break;
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| 248 | case L'C':
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| 249 | fmtw[i + 1] = L'c';
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| 250 | break;
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| 251 | }
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| 252 | } while (keepgoing);
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| 253 | }
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| 254 | fmt = (const TCHAR *)fmtw;
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| 255 | } while (0);
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| 256 |
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| 257 | va_start(ap, fmta);
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| 258 | _vsntprintf(buf, OSSL_NELEM(buf) - 1, fmt, ap);
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| 259 | buf[OSSL_NELEM(buf) - 1] = _T('\0');
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| 260 | va_end(ap);
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| 261 |
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| 262 | # if defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0333
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| 263 | /* this -------------v--- guards NT-specific calls */
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| 264 | if (check_winnt() && OPENSSL_isservice() > 0) {
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| 265 | HANDLE hEventLog = RegisterEventSource(NULL, _T("OpenSSL"));
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| 266 |
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| 267 | if (hEventLog != NULL) {
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| 268 | const TCHAR *pmsg = buf;
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| 269 |
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| 270 | if (!ReportEvent(hEventLog, EVENTLOG_ERROR_TYPE, 0, 0, NULL,
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| 271 | 1, 0, &pmsg, NULL)) {
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| 272 | #if defined(DEBUG)
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| 273 | /*
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| 274 | * We are in a situation where we tried to report a critical
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| 275 | * error and this failed for some reason. As a last resort,
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| 276 | * in debug builds, send output to the debugger or any other
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| 277 | * tool like DebugView which can monitor the output.
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| 278 | */
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| 279 | OutputDebugString(pmsg);
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| 280 | #endif
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| 281 | }
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| 282 |
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| 283 | (void)DeregisterEventSource(hEventLog);
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| 284 | }
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| 285 | } else
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| 286 | # endif
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| 287 | MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK | MB_ICONERROR);
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| 288 | }
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| 289 | #else
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| 290 | void OPENSSL_showfatal(const char *fmta, ...)
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| 291 | {
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| 292 | #ifndef OPENSSL_NO_STDIO
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| 293 | va_list ap;
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| 294 |
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| 295 | va_start(ap, fmta);
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| 296 | vfprintf(stderr, fmta, ap);
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| 297 | va_end(ap);
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| 298 | #endif
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| 299 | }
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| 300 |
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| 301 | int OPENSSL_isservice(void)
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| 302 | {
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| 303 | return 0;
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| 304 | }
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| 305 | #endif
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| 306 |
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| 307 | void OPENSSL_die(const char *message, const char *file, int line)
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| 308 | {
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| 309 | OPENSSL_showfatal("%s:%d: OpenSSL internal error: %s\n",
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| 310 | file, line, message);
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| 311 | #if !defined(_WIN32) || defined(__CYGWIN__)
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| 312 | abort();
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| 313 | #else
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| 314 | /*
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| 315 | * Win32 abort() customarily shows a dialog, but we just did that...
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| 316 | */
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| 317 | # if !defined(_WIN32_WCE)
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| 318 | raise(SIGABRT);
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| 319 | # endif
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| 320 | _exit(3);
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| 321 | #endif
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| 322 | }
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| 323 |
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| 324 | #if !defined(OPENSSL_CPUID_OBJ)
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| 325 | /* volatile unsigned char* pointers are there because
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| 326 | * 1. Accessing a variable declared volatile via a pointer
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| 327 | * that lacks a volatile qualifier causes undefined behavior.
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| 328 | * 2. When the variable itself is not volatile the compiler is
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| 329 | * not required to keep all those reads and can convert
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| 330 | * this into canonical memcmp() which doesn't read the whole block.
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| 331 | * Pointers to volatile resolve the first problem fully. The second
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| 332 | * problem cannot be resolved in any Standard-compliant way but this
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| 333 | * works the problem around. Compilers typically react to
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| 334 | * pointers to volatile by preserving the reads and writes through them.
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| 335 | * The latter is not required by the Standard if the memory pointed to
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| 336 | * is not volatile.
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| 337 | * Pointers themselves are volatile in the function signature to work
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| 338 | * around a subtle bug in gcc 4.6+ which causes writes through
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| 339 | * pointers to volatile to not be emitted in some rare,
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| 340 | * never needed in real life, pieces of code.
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| 341 | */
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| 342 | int CRYPTO_memcmp(const volatile void * volatile in_a,
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| 343 | const volatile void * volatile in_b,
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| 344 | size_t len)
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| 345 | {
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| 346 | size_t i;
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| 347 | const volatile unsigned char *a = in_a;
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| 348 | const volatile unsigned char *b = in_b;
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| 349 | unsigned char x = 0;
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| 350 |
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| 351 | for (i = 0; i < len; i++)
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| 352 | x |= a[i] ^ b[i];
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| 353 |
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| 354 | return x;
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| 355 | }
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| 356 | #endif
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