ntlmauth.cpp

mini http server,可以集成嵌入到程序中,实现简单的web功能

/*____________________________________________________________________________*\

 Copyright (c) 1997-2000 John Roy, Holger Zimmermann. All rights reserved.

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    derived from this software without specific prior written permission.

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 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 *____________________________________________________________________________*|
 *
 * $Source: /cvsroot/pi3web/Pi3Web_200/Source/HTTP/NtlmAuth.cpp,v $
 * $Date: 2003/05/13 18:42:03 $
 *
 Description:
	NTLM authentication module for Windows NT.

\*____________________________________________________________________________*/
/* $SourceTop:$ */

#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <iostream.h>

#if WIN32
#include <windows.h>
#define SECURITY_WIN32
#define WIN32_CHICAGO
#include "sspi.h" 
#include "issperr.h" 
#endif // WIN32

#include "HandBase.h"
#include "PIStrStr.h"
#include "PIString.h"
#include "Pi3API.h"
#include "PiAPI.h"
#include "uuencode.h"

#if WIN32
/*____________________________________________________________________________*\
 *
 Description:
\*____________________________________________________________________________*/
/*
#define D { cerr << __FILE__ << ", " << __LINE__ << endl; }
*/
#define D

/*____________________________________________________________________________*\
 *
 Description:
\*____________________________________________________________________________*/
#define KEY_CONF_REALM		"Realm"
#define KEY_INT_CONVSTATE	"NtlmConvState"
#define NTLM_AUTH_TYPE		"NTLM"
#define CS_HTTP_CHALLENGE 0
#define CS_NTLM_CHALLENGE 1
#define CS_NTLM_RESPONSE  2


/*____________________________________________________________________________*\
 *
 Description:
	Documentation
\*____________________________________________________________________________*/
#if 0
	/*
	** HTML documentation for this handler
	*/
/*___+++HTMLDOC_BEGIN+++___*/
Name:
	NtlmAuth

Description:
    Provide NTLM (challenge response) authentication. Use with Win32 only.

Options:
<H5>Overview</H5>
<TABLE BORDER=1>
<TH>Option
<TH>Default
<TH>Values
<TH>Short Description
<TH>Example(s)

<TR>
<TD>Realm
<TD>+
<TD>A string
<TD>Realm to authenticate
<TD>Realm="Admin"

</TABLE>
<STRONG>-</STRONG> in the <IT>default</IT> indicates no default<BR>
<STRONG>+</STRONG> in the <IT>default</IT> indicates the field is mandatory<BR>

<H4>Description of Options</H4>
<H5>
	Realm
</H5>
Realm to be authenticated by this handler.

Phase:
	CHECKAUTH

Returns:
	PIAPI_COMPLETED if authentication passed. INT_REDIRECT if the
	status was set to 401 to challenge, PIAPI_CONTINUE if this 
	handler choose to take no action and PIAPI_ERROR if this handler
	was invoked for a phase other than CHECKAUTH.

Note:
Example:
	<PRE>
	&lt;Object&gt;
		Name NtlmAuth
		Class NtlmAuthClass
	&lt;/Object&gt;

	&lt;Object&gt;
		...
		Handle NtlmAuth 
		...
	&lt;/Object&gt;
	</PRE>
/*___+++HTMLDOC_END+++___*/
#endif

// Change the following define statement to use "Kerberos"
// For Windows 2000, it could also be "Negotiate" to choose the best
// possible package available to both client and server.
#define PACKAGE_NAME "NTLM"
// #define NT_DLL_NAME "secur32.dll" 
// #define TOKEN_SOURCE_NAME "Pi3Web_NtlmAuth" 
#define wVerRequested 0x0101

// #include "security.h" 

/*____________________________________________________________________________*\
 *
 Class:
 Description:
\*____________________________________________________________________________*/
class NtlmAuth : public HandlerBaseHTTP
{
private:
	PIString sRealm;
	PBYTE g_pInBuf;
	PBYTE g_pOutBuf;
	BOOL _fHaveCredHandle;
	BOOL _fHaveCtxtHandle;
	DWORD g_cbMaxToken;
	TimeStamp Lifetime;
	HINSTANCE g_hLib;
	PSecurityFunctionTable g_pFuncs;
	CredHandle _hcred;
	SecHandle _hctxt;
	const char *pfkConvState;	/* Lookup key for the conversation state */
	
	BOOL InitPackage ( PIOStrStream os ) 
		{
		OSVERSIONINFO VerInfo;
		CHAR lpszDLL[MAX_PATH];
		FARPROC pInit; 
		SECURITY_STATUS ss; 
		PSecPkgInfo pkgInfo; 
		ULONG cPackages;
		SecPkgInfo *ppPackageInfo;
 
		//
		//  Find out which security DLL to use, depending on 
		//  whether we are on NT or Win95
		//
		VerInfo.dwOSVersionInfoSize = sizeof( OSVERSIONINFO );
		if ( !GetVersionEx( &VerInfo ))   // If this fails, something has gone wrong
			{
			os << "Unable to retrieve version info." << ends;
	        return FALSE;
			}

		if ( VerInfo.dwPlatformId == VER_PLATFORM_WIN32_NT )
			{
	        strcpy( lpszDLL, "security.dll" );
			}
	    else if ( VerInfo.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS )
			{
	        strcpy( lpszDLL, "secur32.dll" );
			}
		else
			{
			os << "Unknown or invalid Platform-ID." << ends;
			return FALSE;
			};

		//--------------------------------------------------------------------
		//     Load the SSPI Library Load and initialize a security package. 
		if ( !(g_hLib = LoadLibrary( lpszDLL )))
			{
			os << "Could not load the dll '" << lpszDLL << "'." << ends;
			return FALSE;
			};
	
		if ( !(pInit = GetProcAddress( g_hLib, SECURITY_ENTRYPOINT )))
			{
			os << "Could not get security initialization routine." << ends;
			return FALSE;
			};
 
		if ( !(g_pFuncs = (PSecurityFunctionTable) pInit()))
			{
			os << "Could not initialize the security package." << ends;
			return FALSE;
			};

		//--------------------------------------------------------------------
		//      List the available security packages.
		ss = g_pFuncs->EnumerateSecurityPackages(
			&cPackages,          
			&ppPackageInfo  );

		if ( !SEC_SUCCESS(ss) )
			{
			os << "Could not list available security packages." << ends;
			return FALSE;
			};

		//--------------------------------------------------------------------
		//      Query the security package for the maximum token length..
		ss = g_pFuncs->QuerySecurityPackageInfo (PACKAGE_NAME, &pkgInfo);
		if ( !(SEC_SUCCESS(ss)) )
			{
			os << "Could not query selected package information." << ends;
			return FALSE;
			};

		g_cbMaxToken = pkgInfo->cbMaxToken;
		g_pFuncs->FreeContextBuffer (pkgInfo);

		ss = g_pFuncs->AcquireCredentialsHandle (
			NULL,              // Use the default principal
			PACKAGE_NAME,
			SECPKG_CRED_INBOUND,
			NULL,              // Use the current LOGON id
			NULL,
			NULL,
			NULL,
			&_hcred,
			&Lifetime );

		if ( SEC_SUCCESS (ss) )
			{
			_fHaveCredHandle = TRUE;
			}
		else
			{
			os << "Could not acquire credentials handle." << ends;
			return FALSE;
			};

		return TRUE;
		};

		BOOL ResetConversation( PIHTTP *pPIHTTP )
			{
			PIDB_replace( pPIHTTP->pConnectionDB, PIDBTYPE_OPAQUE, pfkConvState,
				(void *)CS_HTTP_CHALLENGE, PIDBFLAG_FASTKEY );

			if ( _fHaveCtxtHandle ) 
				{
				SECURITY_STATUS ss;
				ss = g_pFuncs->DeleteSecurityContext( &_hctxt );
				};
			_fHaveCtxtHandle = FALSE;
			return TRUE;
			};

		//--------------------------------------------------------------------
		//      Define RevertContext.
		//      Revert to the original server context. 
		//      Return TRUE is successful, otherwise, FALSE. 
		BOOL RevertContext (DWORD dwKey) 
		{
		SECURITY_STATUS ss; 
 
		ss = g_pFuncs->RevertSecurityContext( &_hctxt ); 
		if (!(SEC_SUCCESS(ss)))
		{
//				HANDLE_ERROR("Revert to original context failed.");
		};
		return(TRUE);
		};

protected:
	int Parameter( const char *pVariable, const char *pValue,
		const char *pWhere )
		{
		assert( pVariable && pValue );
		PIOStrStream os;
		os << pWhere << "NtlmAuth: ";
		if ( !PIUtil_stricmp( pVariable, KEY_CONF_REALM ) )
			{
			sRealm = (const char *)pValue;
			if (!InitPackage( os ))
				{
				os << "Security package not initialized." << ends;
				CONFIG_ERR( Object(), os.str() );
				return 0;
				}
			else
				{
				g_pOutBuf = (PBYTE)PIUtil_malloc( g_cbMaxToken );
				g_pInBuf = (PBYTE)PIUtil_malloc( g_cbMaxToken );
				};
			}
		else
			{
			os << "Unknown directive '" << pVariable <<	"'" << ends;
			CONFIG_ERR( Object(), os.str() );
			return 0;
			};
		return 1;
		};

public:
	NtlmAuth( PIObject *pObject, int iArgc, const char *ppArgv[] )
	:	HandlerBaseHTTP( pObject ),
		sRealm( 0 ),
		g_pOutBuf( NULL ),
		g_pInBuf( NULL ),
		_fHaveCredHandle( FALSE ),
		_fHaveCtxtHandle( FALSE ),
		g_cbMaxToken( 0 ),
		pfkConvState( PIDB_getFastKey( KEY_INT_CONVSTATE, PIDBTYPE_STRING ))
		{
		ReadParameters( iArgc, ppArgv );
		};

	~NtlmAuth()
		{
		if ( _fHaveCredHandle )
			{
			g_pFuncs->FreeCredentialHandle( &_hcred );
			};

			if ( g_pOutBuf ) PIUtil_free( g_pOutBuf );
			if ( g_pInBuf ) PIUtil_free( g_pInBuf );
		};

	int Handle( int iPhase, PIHTTP &tPIHTTP, PIIOBuffer &tB )
		{
		int iConvState = CS_HTTP_CHALLENGE;

#define HANDLE_ERROR( code, where )								\
if ( code ) {													\
	HTTPCore_logError( &tPIHTTP,								\
		"NtlmAuth: SSPI error no %Xh in '%s'.", code, where );	\
} else {														\
	HTTPCore_logError( &tPIHTTP,								\
		"NtlmAuth: Error occured in SSPI: %s", where );			\
};																\
ResetConversation( &tPIHTTP );									\
return HTTPUtil_doHTTPError( &tPIHTTP, ST_INTERNALERROR );

#define HANDLE_REDIR																	\
if ( void *pLength = PIDB_lookup( tPIHTTP.pRequestDB, PIDBTYPE_RFC822,					\
	KEY_HTTP_CONTENTLENGTH, 0 )) {														\
	int iLen;																			\
	const char *pBuf = PIIOBuffer_read( &tB, &iLen );									\
	int toRead = atoi((const char *)pLength) - iLen;									\
	while( toRead ) {																	\
		pBuf = PIIOBuffer_read( &tB, &iLen );											\
		toRead -= iLen;																	\
	}																					\
}																						\
tPIHTTP.iStatus = ST_UNAUTHORIZED;														\