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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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#include <Pegasus/Common/System.h>
#include <Pegasus/Common/XmlWriter.h>
#include <Pegasus/Common/Tracer.h>
#include <Pegasus/Common/PegasusVersion.h>
#include <Pegasus/Common/HTTPMessage.h>

#include <Pegasus/Config/ConfigManager.h>

#include "LocalAuthenticationHandler.h"
#include "BasicAuthenticationHandler.h"
#include "AuthenticationManager.h"

#include <Pegasus/Common/AutoPtr.h>

#ifdef PEGASUS_NEGOTIATE_AUTHENTICATION
#include "NegotiateAuthenticationHandler.h"
#endif

PEGASUS_USING_STD;

PEGASUS_NAMESPACE_BEGIN

//
// Constructor
//
AuthenticationManager::AuthenticationManager()
{
    PEG_METHOD_ENTER(
        TRC_AUTHENTICATION, "AuthenticationManager::AuthenticationManager()");

    //
    // get authentication handlers
    //
    _localAuthHandler = _getLocalAuthHandler();

    _httpAuthHandler = _getHttpAuthHandler();

    PEG_METHOD_EXIT();
}

//
// Destructor
//
AuthenticationManager::~AuthenticationManager()
{
    PEG_METHOD_ENTER(
        TRC_AUTHENTICATION, "AuthenticationManager::~AuthenticationManager()");

    //
    // delete authentication handlers
    //
    delete _localAuthHandler;
    delete _httpAuthHandler;

    PEG_METHOD_EXIT();
}

Boolean AuthenticationManager::isRemotePrivilegedUserAccessAllowed(
        String & userName)
{
    //
    // Reject access if the user is privileged and remote privileged user
    // access is not enabled.
    //
    if (!ConfigManager::parseBooleanValue(ConfigManager::getInstance()->
            getCurrentValue("enableRemotePrivilegedUserAccess"))
        && System::isPrivilegedUser(userName))
    {
        Logger::put_l(
            Logger::STANDARD_LOG, System::CIMSERVER, Logger::INFORMATION,
            MessageLoaderParms(
                "Security.Authentication.BasicAuthenticationHandler."
                    "PRIVILEGED_ACCESS_DISABLED",
                "Authentication failed for user '$0' because "
                    "enableRemotePrivilegedUserAccess is not set to 'true'.",
                userName));
        return false;
    }
    return true;
}

//
// Perform http authentication
//
AuthenticationStatus AuthenticationManager::performHttpAuthentication(
    const String& authHeader,
    AuthenticationInfo* authInfo)
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "AuthenticationManager::performHttpAuthentication()");

    String authType;
    String cookie;

    //
    // Parse the HTTP authentication header for authentication information
    //
    if ( !HTTPMessage::parseHttpAuthHeader(authHeader, authType, cookie) )
    {
        PEG_TRACE((
            TRC_DISCARDED_DATA,
            Tracer::LEVEL1,
            "HTTPAuthentication failed. "
                "Malformed HTTP authentication header: %s",
            (const char*)authHeader.getCString()));
        PEG_METHOD_EXIT();
        return AuthenticationStatus(AUTHSC_UNAUTHORIZED);
    }

    AuthenticationStatus authStatus(AUTHSC_UNAUTHORIZED);

    //
    // Check the authenticationinformation and do the authentication
    //
    if ( String::equalNoCase(authType, "Basic") &&
         String::equal(_httpAuthType, "Basic") )
    {
        authStatus = _httpAuthHandler->authenticate(cookie, authInfo);
    }
#ifdef PEGASUS_NEGOTIATE_AUTHENTICATION
    else if ( String::equalNoCase(authType, "Negotiate") &&
              String::equal(_httpAuthType, "Negotiate") )
    {
        authStatus = _httpAuthHandler->authenticate(cookie, authInfo);
    }
#endif
    // FUTURE: Add code to check for "Digest" when digest
    // authentication is implemented.

    if ( authStatus.isSuccess() )
    {
        authInfo->setAuthType(authType);
    }

    PEG_METHOD_EXIT();

    return authStatus;
}

//
// Perform pegasus sepcific local authentication
//
AuthenticationStatus AuthenticationManager::performPegasusAuthentication(
    const String& authHeader,
    AuthenticationInfo* authInfo)
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "AuthenticationManager::performPegasusAuthentication()");

    AuthenticationStatus authStatus(AUTHSC_UNAUTHORIZED);

    String authType;
    String userName;
    String cookie;

    //
    // Parse the pegasus authentication header authentication information
    //
    if ( !HTTPMessage::parseLocalAuthHeader(authHeader,
              authType, userName, cookie) )
    {
        PEG_TRACE((
            TRC_DISCARDED_DATA,
            Tracer::LEVEL1,
            "PegasusAuthentication failed. "
                "Malformed Pegasus authentication header: %s",
            (const char*)authHeader.getCString()));
        PEG_METHOD_EXIT();
        return AuthenticationStatus(AUTHSC_UNAUTHORIZED);
    }

    // The HTTPAuthenticatorDelegator ensures only local authentication
    // requests get here.
    PEGASUS_ASSERT(authType == "Local");

    authStatus = _localAuthHandler->authenticate(cookie, authInfo);

    if ( authStatus.isSuccess() )
    {
        authInfo->setAuthType(authType);
    }

    PEG_METHOD_EXIT();

    return authStatus;
}

//
// Validate user.
//
AuthenticationStatus AuthenticationManager::validateUserForHttpAuth(
    const String& userName,
    AuthenticationInfo* authInfo)
{
    return _httpAuthHandler->validateUser(userName,authInfo);
}

//
// Get pegasus/local authentication response header
//
String AuthenticationManager::getPegasusAuthResponseHeader(
    const String& authHeader,
    AuthenticationInfo* authInfo)
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "AuthenticationManager::getPegasusAuthResponseHeader()");

    String respHeader;

    String authType;
    String userName;
    String cookie;

    //
    // Parse the pegasus authentication header authentication information
    //
    if ( !HTTPMessage::parseLocalAuthHeader(authHeader,
              authType, userName, cookie) )
    {
        PEG_METHOD_EXIT();
        return respHeader;
    }

    //
    // User name can not be empty
    //
    if (String::equal(userName, String::EMPTY))
    {
        PEG_METHOD_EXIT();
        return respHeader;
    }

    respHeader =
        _localAuthHandler->getAuthResponseHeader(authType, userName, authInfo);

    PEG_METHOD_EXIT();
    return respHeader;

}

//
// Get HTTP authentication response header
//
#ifdef PEGASUS_NEGOTIATE_AUTHENTICATION
String AuthenticationManager::getHttpAuthResponseHeader(
    AuthenticationInfo* authInfo)
#else
String AuthenticationManager::getHttpAuthResponseHeader()
#endif
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "AuthenticationManager::getHttpAuthResponseHeader()");

#ifdef PEGASUS_NEGOTIATE_AUTHENTICATION
    String respHeader = _httpAuthHandler->getAuthResponseHeader(
        String::EMPTY, String::EMPTY, authInfo);
#else
    String respHeader = _httpAuthHandler->getAuthResponseHeader();
#endif
    PEG_METHOD_EXIT();
    return respHeader;
}

//
// Get local authentication handler
//
Authenticator* AuthenticationManager::_getLocalAuthHandler()
{
    PEG_METHOD_ENTER(
        TRC_AUTHENTICATION, "AuthenticationManager::_getLocalAuthHandler()");

    PEG_METHOD_EXIT();
    //
    // create and return a local authentication handler.
    //
    return new LocalAuthenticationHandler();
}


//
// Get Http authentication handler
//
Authenticator* AuthenticationManager::_getHttpAuthHandler()
{
    PEG_METHOD_ENTER(
        TRC_AUTHENTICATION, "AuthenticationManager::_getHttpAuthHandler()");
    AutoPtr<Authenticator> handler;

    //
    // get the configured authentication type
    //
    AutoPtr<ConfigManager> configManager(ConfigManager::getInstance());

    _httpAuthType = configManager->getCurrentValue("httpAuthType");
    configManager.release();
    //
    // create a authentication handler.
    //
    if ( String::equal(_httpAuthType, "Basic") )
    {
        handler.reset((Authenticator* ) new BasicAuthenticationHandler( ));
    }
#ifdef PEGASUS_NEGOTIATE_AUTHENTICATION
    if ( String::equal(_httpAuthType, "Negotiate") )
    {
        handler.reset((Authenticator* ) new NegotiateAuthenticationHandler( ));
    }
#endif
    // FUTURE: uncomment these line when Digest authentication
    // is implemented.
    //
    //else if (String::equal(_httpAuthType, "Digest"))
    //{
    //    handler = (Authenticator* ) new DigestAuthenticationHandler( );
    //}
    else
    {
        //
        // This should never happen. Gets here only if Security Config
        // property owner has not validated the configured http auth type.
        //
        PEGASUS_UNREACHABLE(PEGASUS_ASSERT(0);)
    }

    PEG_METHOD_EXIT();
    return handler.release();
}

PEGASUS_NAMESPACE_END