crypto/cryptlib.c

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