crypto/cryptlib.c

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