socketwrapper.c

   1 // socketwrapper.c
   2 // Copyright (C) 2011 Suguru Kawamoto
   3 // ソケットラッパー
   4 // socket関連関数をOpenSSL用に置換
   5 // コンパイルにはOpenSSLのヘッダーファイルが必要
   6 // 実行にはOpenSSLのDLLが必要
   7
   8 #include <windows.h>
   9 #include <mmsystem.h>
  10 #include <openssl/ssl.h>
  11
  12 #include "socketwrapper.h"
  13 #include "protectprocess.h"
  14
  15 typedef void (__cdecl* _SSL_load_error_strings)();
  16 typedef int (__cdecl* _SSL_library_init)();
  17 typedef SSL_METHOD* (__cdecl* _SSLv23_method)();
  18 typedef SSL_CTX* (__cdecl* _SSL_CTX_new)(SSL_METHOD*);
  19 typedef void (__cdecl* _SSL_CTX_free)(SSL_CTX*);
  20 typedef SSL* (__cdecl* _SSL_new)(SSL_CTX*);
  21 typedef void (__cdecl* _SSL_free)(SSL*);
  22 typedef int (__cdecl* _SSL_shutdown)(SSL*);
  23 typedef int (__cdecl* _SSL_get_fd)(SSL*);
  24 typedef int (__cdecl* _SSL_set_fd)(SSL*, int);
  25 typedef int (__cdecl* _SSL_accept)(SSL*);
  26 typedef int (__cdecl* _SSL_connect)(SSL*);
  27 typedef int (__cdecl* _SSL_write)(SSL*, const void*, int);
  28 typedef int (__cdecl* _SSL_peek)(SSL*, void*, int);
  29 typedef int (__cdecl* _SSL_read)(SSL*, void*, int);
  30 typedef int (__cdecl* _SSL_get_error)(SSL*, int);
  31
  32 _SSL_load_error_strings pSSL_load_error_strings;
  33 _SSL_library_init pSSL_library_init;
  34 _SSLv23_method pSSLv23_method;
  35 _SSL_CTX_new pSSL_CTX_new;
  36 _SSL_CTX_free pSSL_CTX_free;
  37 _SSL_new pSSL_new;
  38 _SSL_free pSSL_free;
  39 _SSL_shutdown pSSL_shutdown;
  40 _SSL_get_fd pSSL_get_fd;
  41 _SSL_set_fd pSSL_set_fd;
  42 _SSL_accept pSSL_accept;
  43 _SSL_connect pSSL_connect;
  44 _SSL_write pSSL_write;
  45 _SSL_peek pSSL_peek;
  46 _SSL_read pSSL_read;
  47 _SSL_get_error pSSL_get_error;
  48
  49 #define MAX_SSL_SOCKET 64
  50
  51 BOOL g_bOpenSSLLoaded;
  52 HMODULE g_hOpenSSL;
  53 CRITICAL_SECTION g_OpenSSLLock;
  54 DWORD g_OpenSSLTimeout;
  55 LPSSLTIMEOUTCALLBACK g_pOpenSSLTimeoutCallback;
  56 SSL_CTX* g_pOpenSSLCTX;
  57 SSL* g_pOpenSSLHandle[MAX_SSL_SOCKET];
  58
  59 BOOL __stdcall DefaultSSLTimeoutCallback()
  60 {
  61         Sleep(100);
  62         return FALSE;
  63 }
  64
  65 BOOL LoadOpenSSL()
  66 {
  67         if(g_bOpenSSLLoaded)
  68                 return FALSE;
  69 #ifdef ENABLE_PROCESS_PROTECTION
  70         // ssleay32.dll 1.0.0e
  71         // libssl32.dll 1.0.0e
  72         RegisterTrustedModuleMD5Hash("\x8B\xA3\xB7\xB3\xCE\x2E\x4F\x07\x8C\xB8\x93\x7D\x77\xE1\x09\x3A");
  73         // libeay32.dll 1.0.0e
  74         RegisterTrustedModuleMD5Hash("\xA6\x4C\xAF\x9E\xF3\xDC\xFC\x68\xAE\xCA\xCC\x61\xD2\xF6\x70\x8B");
  75 #endif
  76         g_hOpenSSL = LoadLibrary("ssleay32.dll");
  77         if(!g_hOpenSSL)
  78                 g_hOpenSSL = LoadLibrary("libssl32.dll");
  79         if(!g_hOpenSSL
  80                 || !(pSSL_load_error_strings = (_SSL_load_error_strings)GetProcAddress(g_hOpenSSL, "SSL_load_error_strings"))
  81                 || !(pSSL_library_init = (_SSL_library_init)GetProcAddress(g_hOpenSSL, "SSL_library_init"))
  82                 || !(pSSLv23_method = (_SSLv23_method)GetProcAddress(g_hOpenSSL, "SSLv23_method"))
  83                 || !(pSSL_CTX_new = (_SSL_CTX_new)GetProcAddress(g_hOpenSSL, "SSL_CTX_new"))
  84                 || !(pSSL_CTX_free = (_SSL_CTX_free)GetProcAddress(g_hOpenSSL, "SSL_CTX_free"))
  85                 || !(pSSL_new = (_SSL_new)GetProcAddress(g_hOpenSSL, "SSL_new"))
  86                 || !(pSSL_free = (_SSL_free)GetProcAddress(g_hOpenSSL, "SSL_free"))
  87                 || !(pSSL_shutdown = (_SSL_shutdown)GetProcAddress(g_hOpenSSL, "SSL_shutdown"))
  88                 || !(pSSL_get_fd = (_SSL_get_fd)GetProcAddress(g_hOpenSSL, "SSL_get_fd"))
  89                 || !(pSSL_set_fd = (_SSL_set_fd)GetProcAddress(g_hOpenSSL, "SSL_set_fd"))
  90                 || !(pSSL_accept = (_SSL_accept)GetProcAddress(g_hOpenSSL, "SSL_accept"))
  91                 || !(pSSL_connect = (_SSL_connect)GetProcAddress(g_hOpenSSL, "SSL_connect"))
  92                 || !(pSSL_write = (_SSL_write)GetProcAddress(g_hOpenSSL, "SSL_write"))
  93                 || !(pSSL_peek = (_SSL_peek)GetProcAddress(g_hOpenSSL, "SSL_peek"))
  94                 || !(pSSL_read = (_SSL_read)GetProcAddress(g_hOpenSSL, "SSL_read"))
  95                 || !(pSSL_get_error = (_SSL_get_error)GetProcAddress(g_hOpenSSL, "SSL_get_error")))
  96         {
  97                 if(g_hOpenSSL)
  98                         FreeLibrary(g_hOpenSSL);
  99                 g_hOpenSSL = NULL;
 100                 return FALSE;
 101         }
 102         InitializeCriticalSection(&g_OpenSSLLock);
 103         pSSL_load_error_strings();
 104         pSSL_library_init();
 105         SetSSLTimeoutCallback(60000, DefaultSSLTimeoutCallback);
 106         g_bOpenSSLLoaded = TRUE;
 107         return TRUE;
 108 }
 109
 110 void FreeOpenSSL()
 111 {
 112         int i;
 113         if(!g_bOpenSSLLoaded)
 114                 return;
 115         EnterCriticalSection(&g_OpenSSLLock);
 116         for(i = 0; i < MAX_SSL_SOCKET; i++)
 117         {
 118                 if(g_pOpenSSLHandle[i])
 119                 {
 120                         pSSL_shutdown(g_pOpenSSLHandle[i]);
 121                         pSSL_free(g_pOpenSSLHandle[i]);
 122                         g_pOpenSSLHandle[i] = NULL;
 123                 }
 124         }
 125         if(g_pOpenSSLCTX)
 126                 pSSL_CTX_free(g_pOpenSSLCTX);
 127         g_pOpenSSLCTX = NULL;
 128         FreeLibrary(g_hOpenSSL);
 129         g_hOpenSSL = NULL;
 130         LeaveCriticalSection(&g_OpenSSLLock);
 131         DeleteCriticalSection(&g_OpenSSLLock);
 132         g_bOpenSSLLoaded = FALSE;
 133 }
 134
 135 BOOL IsOpenSSLLoaded()
 136 {
 137         return g_bOpenSSLLoaded;
 138 }
 139
 140 SSL** GetUnusedSSLPointer()
 141 {
 142         int i;
 143         for(i = 0; i < MAX_SSL_SOCKET; i++)
 144         {
 145                 if(!g_pOpenSSLHandle[i])
 146                         return &g_pOpenSSLHandle[i];
 147         }
 148         return NULL;
 149 }
 150
 151 SSL** FindSSLPointerFromSocket(SOCKET s)
 152 {
 153         int i;
 154         for(i = 0; i < MAX_SSL_SOCKET; i++)
 155         {
 156                 if(g_pOpenSSLHandle[i])
 157                 {
 158                         if(pSSL_get_fd(g_pOpenSSLHandle[i]) == s)
 159                                 return &g_pOpenSSLHandle[i];
 160                 }
 161         }
 162         return NULL;
 163 }
 164
 165 void SetSSLTimeoutCallback(DWORD Timeout, LPSSLTIMEOUTCALLBACK pCallback)
 166 {
 167         if(!g_bOpenSSLLoaded)
 168                 return;
 169         EnterCriticalSection(&g_OpenSSLLock);
 170         g_OpenSSLTimeout = Timeout;
 171         g_pOpenSSLTimeoutCallback = pCallback;
 172         LeaveCriticalSection(&g_OpenSSLLock);
 173 }
 174
 175 BOOL AttachSSL(SOCKET s)
 176 {
 177         BOOL r;
 178         DWORD Time;
 179         SSL** ppSSL;
 180         if(!g_bOpenSSLLoaded)
 181                 return FALSE;
 182         r = FALSE;
 183         Time = timeGetTime();
 184         EnterCriticalSection(&g_OpenSSLLock);
 185         if(!g_pOpenSSLCTX)
 186                 g_pOpenSSLCTX = pSSL_CTX_new(pSSLv23_method());
 187         if(g_pOpenSSLCTX)
 188         {
 189                 if(ppSSL = GetUnusedSSLPointer())
 190                 {
 191                         if(*ppSSL = pSSL_new(g_pOpenSSLCTX))
 192                         {
 193                                 if(pSSL_set_fd(*ppSSL, s) != 0)
 194                                 {
 195                                         r = TRUE;
 196                                         // SSLのネゴシエーションには時間がかかる場合がある
 197                                         while(pSSL_connect(*ppSSL) != 1)
 198                                         {
 199                                                 LeaveCriticalSection(&g_OpenSSLLock);
 200                                                 if(g_pOpenSSLTimeoutCallback() || timeGetTime() - Time >= g_OpenSSLTimeout)
 201                                                 {
 202                                                         DetachSSL(s);
 203                                                         r = FALSE;
 204                                                         EnterCriticalSection(&g_OpenSSLLock);
 205                                                         break;
 206                                                 }
 207                                                 EnterCriticalSection(&g_OpenSSLLock);
 208                                         }
 209                                 }
 210                                 else
 211                                 {
 212                                         LeaveCriticalSection(&g_OpenSSLLock);
 213                                         DetachSSL(s);
 214                                         EnterCriticalSection(&g_OpenSSLLock);
 215                                 }
 216                         }
 217                 }
 218         }
 219         LeaveCriticalSection(&g_OpenSSLLock);
 220         return r;
 221 }
 222
 223 BOOL DetachSSL(SOCKET s)
 224 {
 225         BOOL r;
 226         SSL** ppSSL;
 227         if(!g_bOpenSSLLoaded)
 228                 return FALSE;
 229         r = FALSE;
 230         EnterCriticalSection(&g_OpenSSLLock);
 231         if(ppSSL = FindSSLPointerFromSocket(s))
 232         {
 233                 pSSL_shutdown(*ppSSL);
 234                 pSSL_free(*ppSSL);
 235                 *ppSSL = NULL;
 236                 r = TRUE;
 237         }
 238         LeaveCriticalSection(&g_OpenSSLLock);
 239         return r;
 240 }
 241
 242 BOOL IsSSLAttached(SOCKET s)
 243 {
 244         SSL** ppSSL;
 245         if(!g_bOpenSSLLoaded)
 246                 return FALSE;
 247         EnterCriticalSection(&g_OpenSSLLock);
 248         ppSSL = FindSSLPointerFromSocket(s);
 249         LeaveCriticalSection(&g_OpenSSLLock);
 250         if(!ppSSL)
 251                 return TRUE;
 252         return TRUE;
 253 }
 254
 255 SOCKET socketS(int af, int type, int protocol)
 256 {
 257         return socket(af, type, protocol);
 258 }
 259
 260 int bindS(SOCKET s, const struct sockaddr *addr, int namelen)
 261 {
 262         return bind(s, addr, namelen);
 263 }
 264
 265 int listenS(SOCKET s, int backlog)
 266 {
 267         return listen(s, backlog);
 268 }
 269
 270 SOCKET acceptS(SOCKET s, struct sockaddr *addr, int *addrlen)
 271 {
 272         SOCKET r;
 273         r = accept(s, addr, addrlen);
 274         if(!AttachSSL(r))
 275         {
 276                 closesocket(r);
 277                 return INVALID_SOCKET;
 278         }
 279         return r;
 280 }
 281
 282 int connectS(SOCKET s, const struct sockaddr *name, int namelen)
 283 {
 284         int r;
 285         r = connect(s, name, namelen);
 286         if(!AttachSSL(r))
 287                 return SOCKET_ERROR;
 288         return r;
 289 }
 290
 291 int closesocketS(SOCKET s)
 292 {
 293         DetachSSL(s);
 294         return closesocket(s);
 295 }
 296
 297 int sendS(SOCKET s, const char * buf, int len, int flags)
 298 {
 299         SSL** ppSSL;
 300         if(!g_bOpenSSLLoaded)
 301                 return send(s, buf, len, flags);
 302         EnterCriticalSection(&g_OpenSSLLock);
 303         ppSSL = FindSSLPointerFromSocket(s);
 304         LeaveCriticalSection(&g_OpenSSLLock);
 305         if(!ppSSL)
 306                 return send(s, buf, len, flags);
 307         return pSSL_write(*ppSSL, buf, len);
 308 }
 309
 310 int recvS(SOCKET s, char * buf, int len, int flags)
 311 {
 312         SSL** ppSSL;
 313         if(!g_bOpenSSLLoaded)
 314                 return recv(s, buf, len, flags);
 315         EnterCriticalSection(&g_OpenSSLLock);
 316         ppSSL = FindSSLPointerFromSocket(s);
 317         LeaveCriticalSection(&g_OpenSSLLock);
 318         if(!ppSSL)
 319                 return recv(s, buf, len, flags);
 320         if(flags & MSG_PEEK)
 321                 return pSSL_peek(*ppSSL, buf, len);
 322         return pSSL_read(*ppSSL, buf, len);
 323 }
 324