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BUG#: 9883
TITLE: Implement HTTP Negotiate authentication

DESCRIPTION: Implemented HTTP Negotiate authentication, as described in
RFC 4559. It uses SPNEGO protocol, GSSAPI as authentication API and MIT
Kerberos as GSSAPI implementation. The implementation should be
interchangeable, any GSSAPI implementation should work.

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#ifndef Pegasus_NegotiateAuthenticationHandler_h
#define Pegasus_NegotiateAuthenticationHandler_h

#include <Pegasus/Common/Config.h>
#include <Pegasus/Common/String.h>
#include <Pegasus/Common/AutoPtr.h>

#include <Pegasus/Security/Authentication/Linkage.h>
#include "Authenticator.h"

PEGASUS_NAMESPACE_BEGIN

/**
    This class implements the AuthenticationHandler for SPNEGO authenticator,
    as described in RFC 4559.  It extends the Authenticator and provides the
    implementation (using MIT Kerberos).
*/

#ifdef PEGASUS_NEGOTIATE_AUTHENTICATION

class PEGASUS_SECURITY_LINKAGE NegotiateAuthenticationHandler
    : public Authenticator
{
public:

    /** Constructors  */
    NegotiateAuthenticationHandler();

    /** Destructor  */
    ~NegotiateAuthenticationHandler();

    /** Verify the authentication of the user passed in the authorization
        header.
        @param authHeader String containing the Authorization header
        @param authInfo Reference to AuthenticationInfo object
        @return AuthenticationStatus holding http status code and error detail
    */
    AuthenticationStatus authenticate(
        const String& authHeader,
        AuthenticationInfo* authInfo);

    /** Construct and return the Pegasus Local authentication challenge header
        @param authType String containing the HTTP authentication type
        @param userName String containing the user name
        @param authInfo Reference to AuthenticationInfo object
        @return A string containing the authentication challenge header.
    */
    String getAuthResponseHeader(
        const String& authType = String::EMPTY,
        const String& userName = String::EMPTY,
        AuthenticationInfo* authInfo = 0);

    /**
        Verify whether the user is valid.
        @param userName String containing the user name
        @param authInfo reference to AuthenticationInfo object that holds the
        authentication information for the given connection.
        @return AuthenticationStatus holding http status code and error detail
    */
    AuthenticationStatus validateUser(
        const String& userName,
        AuthenticationInfo* authInfo = 0);

};


#endif
PEGASUS_NAMESPACE_END

#endif /* Pegasus_NegotiateAuthenticationHandler_h*/