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| 关键词： nbsp return printf NULL RecvAddr ZWQUERYSYSTEMINF SOCKET ORMATION HANDLE ULONG |
需要说明的是，在实际编程中出现了很多问题，比如说获取svchost对应用户名时没有权限（但是能够操作LOCAL SERVICE）、在句柄值为0x2c时进行getsockname时会停止运行等等。具体解决方法请您仔细阅读源代码中的注释部分。 最后，我们可以再用测试代码看看效果。测试步骤： 源代码部分：/*++ Made By ZwelL [email protected] 2005.4.12--*/#include <winsock2.h>#include <stdio.h>#include <wtsapi32.h>#pragma comment(lib, "ws2_32")#pragma comment(lib, "wtsapi32")#define NT_SUCCESS(status) ((NTSTATUS)(status)>=0)#define STATUS_INFO_LENGTH_MISMATCH ((NTSTATUS)0xC0000004L)typedef LONG NTSTATUS;typedef struct _SYSTEM_HANDLE_INFORMATION{ ULONG ProcessId; UCHAR ObjectTypeNumber; UCHAR Flags; USHORT Handle; PVOID Object; ACCESS_MASK GrantedAccess;} SYSTEM_HANDLE_INFORMATION, *PSYSTEM_HANDLE_INFORMATION;typedef ULONG (WINAPI *ZWQUERYSYSTEMINFORMATION)(ULONG, PVOID, ULONG, PULONG);ZWQUERYSYSTEMINFORMATION ZwQuerySystemInformation = NULL;BOOL LocateNtdllEntry ( void ){ BOOL ret = FALSE; char NTDLL_DLL[] = "ntdll.dll"; HMODULE ntdll_dll = NULL; if ( ( ntdll_dll = GetModuleHandle( NTDLL_DLL ) ) == NULL ) { printf( "GetModuleHandle() failed"); return( FALSE ); } if ( !( ZwQuerySystemInformation = ( ZWQUERYSYSTEMINFORMATION )GetProcAddress( ntdll_dll, "ZwQuerySystemInformation" ) ) ) { goto LocateNtdllEntry_exit; } ret = TRUE;LocateNtdllEntry_exit: if ( FALSE == ret ) { printf( "GetProcAddress() failed"); } ntdll_dll = NULL; return( ret );}/*++This routine is used to get a process's username from it's SID--*/BOOL GetUserNameFromSid(PSID pUserSid, char *szUserName){ // sanity checks and default value if (pUserSid == NULL) return false; strcpy(szUserName, "?"); SID_NAME_USE snu; TCHAR szUser[_MAX_PATH]; DWORD chUser = _MAX_PATH; PDWORD pcchUser = &chUser; TCHAR szDomain[_MAX_PATH]; DWORD chDomain = _MAX_PATH; PDWORD pcchDomain = &chDomain; // Retrieve user name and domain name based on user's SID. if ( ::LookupAccountSid( NULL, pUserSid, szUser, pcchUser, szDomain, pcchDomain, &snu ) ) { wsprintf(szUserName, "%s", szUser); } else { return false; } return true;} /*++This routine is used to get the DNS process's Id Here, I use WTSEnumerateProcesses to get process user Sid, and then get the process user name. Beacause as it's a "NETWORK SERVICE", we cann't use OpenProcessToken to catch the DNS process's token information,even if we has the privilege in catching the SYSTEM's.--*/DWORD GetDNSProcessId(){ PWTS_PROCESS_INFO pProcessInfo = NULL; DWORD ProcessCount = 0; char szUserName[255]; DWORD Id = -1; if (WTSEnumerateProcesses(WTS_CURRENT_SERVER_HANDLE, 0, 1, &pProcessInfo, &ProcessCount)) { // dump each process description for (DWORD CurrentProcess = 0; CurrentProcess < ProcessCount; CurrentProcess++) { if( strcmp(pProcessInfo[CurrentProcess].pProcessName, "svchost.exe") == 0 ) { GetUserNameFromSid(pProcessInfo[CurrentProcess].pUserSid, szUserName); if( strcmp(szUserName, "NETWORK SERVICE") == 0) { Id = pProcessInfo[CurrentProcess].ProcessId; break; } } } WTSFreeMemory(pProcessInfo); } return Id;}/*++This doesn't work as we know, sign...but you can use the routine for other useing...--*//*BOOL GetProcessUserFromId(char *szAccountName, DWORD PID){ HANDLE hProcess = NULL, hAccessToken = NULL; TCHAR InfoBuffer[1000], szDomainName[200]; PTOKEN_USER pTokenUser = (PTOKEN_USER)InfoBuffer; DWORD dwInfoBufferSize,dwAccountSize = 200, dwDomainSize = 200; SID_NAME_USE snu; hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, PID); if(hProcess == NULL) { printf("OpenProcess wrong"); CloseHandle(hProcess); return false; } if(0 == OpenProcessToken(hProcess,TOKEN_QUERY,&hAccessToken)) { printf("OpenProcessToken wrong:%08x", GetLastError()); return false; } GetTokenInformation(hAccessToken,TokenUser,InfoBuffer, 1000, &dwInfoBufferSize); LookupAccountSid(NULL, pTokenUser->User.Sid, szAccountName, &dwAccountSize,szDomainName, &dwDomainSize, &snu); if(hProcess) CloseHandle(hProcess); if(hAccessToken) CloseHandle(hAccessToken); return true;}*//*++Now, it is the most important stuff... ^_^--*/SOCKET GetSocketFromId (DWORD PID){ NTSTATUS status; PVOID buf = NULL; ULONG size = 1; ULONG NumOfHandle = 0; ULONG i; PSYSTEM_HANDLE_INFORMATION h_info = NULL; HANDLE sock = NULL; DWORD n; buf=malloc(0x1000); if(buf == NULL) { printf("malloc wrong\n"); return NULL; } status = ZwQuerySystemInformation( 0x10, buf, 0x1000, &n ); if(STATUS_INFO_LENGTH_MISMATCH == status) { free(buf); buf=malloc(n); if(buf == NULL) { printf("malloc wrong\n"); return NULL; } status = ZwQuerySystemInformation( 0x10, buf, n, NULL); } else { printf("ZwQuerySystemInformation wrong\n"); return NULL; } NumOfHandle = *(ULONG*)buf; h_info = ( PSYSTEM_HANDLE_INFORMATION )((ULONG)buf+4); for(i = 0; i<NumOfHandle ;i++) { try { if( ( h_info[i].ProcessId == PID ) && ( h_info[i].ObjectTypeNumber == 0x1c ) && (h_info[i].Handle!=0x2c) // I don't know why if the Handle equal to 0x2c, in my test, it stops at getsockname() // So I jump over this situation... // May be it's different in your system, ) //wind2000 is 0x1a { //printf("Handle:0x%x Type:%08x\n",h_info[i].Handle, h_info[i].ObjectTypeNumber); if( 0 == DuplicateHandle( OpenProcess(PROCESS_ALL_ACCESS, TRUE, PID), (HANDLE)h_info[i].Handle, GetCurrentProcess(), &sock, STANDARD_RIGHTS_REQUIRED, true, DUPLICATE_SAME_ACCESS) ) { printf("DuplicateHandle wrong:%8x", GetLastError()); continue; } //printf("DuplicateHandle ok\n"); sockaddr_in name = {0}; name.sin_family = AF_INET; int namelen = sizeof(sockaddr_in); getsockname( (SOCKET)sock, (sockaddr*)&name, &namelen ); //printf("PORT=%5d\n", ntohs( name.sin_port )); if(ntohs(name.sin_port)>0) // if port > 0, then we can use it break; } } catch(...) { continue; } } if ( buf != NULL ) { free( buf ); } return (SOCKET)sock;}/*++This is not required...--*/BOOL EnablePrivilege (PCSTR name){ HANDLE hToken; BOOL rv; TOKEN_PRIVILEGES priv = { 1, {0, 0, SE_PRIVILEGE_ENABLED} }; LookupPrivilegeValue ( 0, name, &priv.Privileges[0].Luid ); priv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; OpenProcessToken( GetCurrentProcess (), TOKEN_ADJUST_PRIVILEGES, &hToken ); AdjustTokenPrivileges ( hToken, FALSE, &priv, sizeof priv, 0, 0 ); rv = GetLastError () == ERROR_SUCCESS; CloseHandle (hToken); return rv;}void main() { WSADATA wsaData; char testbuf[255]; SOCKET sock; sockaddr_in RecvAddr; int iResult = WSAStartup(MAKEWORD(2,2), &wsaData); if (iResult != NO_ERROR) printf("Error at WSAStartup()\n"); if(!LocateNtdllEntry()) return; if(!EnablePrivilege (SE_DEBUG_NAME)) { printf("EnablePrivilege wrong\n"); return; } sock = GetSocketFromId(GetDNSProcessId()); if( sock==NULL) { printf("GetSocketFromId wrong\n"); return; } //Change there value... RecvAddr.sin_family = AF_INET; RecvAddr.sin_port = htons(5555); RecvAddr.sin_addr.s_addr = inet_addr("127.0.0.1"); if(SOCKET_ERROR == sendto(sock, "test", 5, 0, (SOCKADDR *) &RecvAddr, sizeof(RecvAddr))) { printf("sendto wrong:%d\n", WSAGetLastError()); } else { printf("send ok... Have fun, right? ^_^\n"); } getchar(); //WSACleanup(); return;}测试代码部分：/*++UdpReceiver--*/#include <stdio.h>#include "winsock2.h"#pragma comment(lib, "ws2_32")void main() { WSADATA wsaData; SOCKET RecvSocket; sockaddr_in RecvAddr; int Port = 5555; char RecvBuf[1024]; int BufLen = 1024; sockaddr_in SenderAddr; int SenderAddrSize = sizeof(SenderAddr); //----------------------------------------------- // Initialize Winsock WSAStartup(MAKEWORD(2,2), &wsaData); //----------------------------------------------- // Create a receiver socket to receive datagrams RecvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); //----------------------------------------------- // Bind the socket to any address and the specified port. RecvAddr.sin_family = AF_INET; RecvAddr.sin_port = htons(Port); RecvAddr.sin_addr.s_addr = htonl(INADDR_ANY); bind(RecvSocket, (SOCKADDR *) &RecvAddr, sizeof(RecvAddr)); //----------------------------------------------- // Call the recvfrom function to receive datagrams // on the bound socket. printf("Receiving datagrams...\n"); while(1) { recvfrom(RecvSocket, RecvBuf, BufLen, 0, (SOCKADDR *)&SenderAddr, &SenderAddrSize); printf("%s\n", RecvBuf); } //----------------------------------------------- // Close the socket when finished receiving datagrams printf("Finished receiving. Closing socket.\n"); closesocket(RecvSocket); //----------------------------------------------- // Clean up and exit. printf("Exiting.\n"); WSACleanup(); return;}1、在一台机器上执行UdpReceiver； 2、在安装防火墙的机器上执行第一个程序。 小结：在本例的源代码中，因为要在多个svchost.exe进程中找出DNS进程句柄，所以通过用户名进行判断。其实本来是计划采用OpenProcessToken的，但在编程中发现始终不能实现，只好换了方法。例子中还用到了wtsapi32库函数。 1 2 |
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