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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/AuditLogger.h>
#include <Pegasus/Common/Logger.h>
#include <Pegasus/Common/Tracer.h>

#include "NegotiateAuthenticationHandler.h"
#include <Pegasus/Common/Base64.h>
#include <Pegasus/Config/ConfigManager.h>
//PEGASUS_USING_STD;

PEGASUS_NAMESPACE_BEGIN


static const char NEGOTIATE_AUTHENTICATION_FAILED_KEY [] =
    "Security.Authentication.NegotiateAuthenticationHandler."
        "BASIC_AUTHENTICATION_FAILURE";

static const char NEGOTIATE_AUTHENTICATION_FAILED[] =
    "Authentication failed for user $0 from client IP address $1.";

static const char NEGOTIATE_AUTHENTICATION_SUCCESS_KEY [] =
    "Security.Authentication.NegotiateAuthenticationHandler."
        "BASIC_AUTHENTICATION_FAILURE";

static const char NEGOTIATE_AUTHENTICATION_SUCCESS[] =
    "Authentication succeeded for user $0 from client IP address $1.";

static const char NEGOTIATE_AUTHENTICATION_CONTINUE_KEY [] =
    "Security.Authentication.NegotiateAuthenticationHandler."
        "BASIC_AUTHENTICATION_FAILURE";

static const char NEGOTIATE_AUTHENTICATION_CONTINUE[] =
    "Authentication continues for user $0 from client IP address $1.";

static const String NEGOTIATE_AUTHENTICATION_CHALLENGE_HEADER =
    "WWW-Authenticate: Negotiate ";

NegotiateAuthenticationHandler::NegotiateAuthenticationHandler()
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
       "NegotiateAuthenticationHandler::NegotiateAuthenticationHandler()");

    PEG_METHOD_EXIT();
}

NegotiateAuthenticationHandler::~NegotiateAuthenticationHandler()
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "NegotiateAuthenticationHandler::~NegotiateAuthenticationHandler()");

    PEG_METHOD_EXIT();
}

AuthenticationStatus NegotiateAuthenticationHandler::authenticate(
    const String& authHeader,
    AuthenticationInfo* authInfo)
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "NegotiateAuthenticationHandler::authenticate()");

    ConfigManager* configManager = ConfigManager::getInstance();
    Boolean mapToLocalName = ConfigManager::parseBooleanValue(
        configManager->getCurrentValue("mapToLocalName"));

    SharedPtr<NegotiateServerSession> session = authInfo->getNegotiateSession();
    String userName;
    NegotiateAuthenticationStatus status = session->authenticate(authHeader,
            userName, mapToLocalName);

    if (userName != String::EMPTY)
        authInfo->setAuthenticatedUser(userName);

    bool authenticated = false;
    switch(status)
    {
    case NEGOTIATE_SUCCESS:
        // authentication finished successfully, audit it
        PEG_AUDIT_LOG(logBasicAuthentication(
            userName,
            authInfo->getIpAddress(),
            true));

        Logger::put_l(Logger::STANDARD_LOG, System::CIMSERVER,
            Logger::TRACE,
            MessageLoaderParms(
                    NEGOTIATE_AUTHENTICATION_SUCCESS_KEY,
                    NEGOTIATE_AUTHENTICATION_SUCCESS,
                    userName,
                    authInfo->getIpAddress()));
        authenticated = true;
        break;

    case NEGOTIATE_CONTINUE:
        Logger::put_l(Logger::STANDARD_LOG, System::CIMSERVER,
            Logger::TRACE,
            MessageLoaderParms(
                    NEGOTIATE_AUTHENTICATION_CONTINUE_KEY,
                    NEGOTIATE_AUTHENTICATION_CONTINUE,
                    userName,
                    authInfo->getIpAddress()));
        break;

    case NEGOTIATE_FAILED:
        String userName = authInfo->getAuthenticatedUser();
        // audit the failure
        PEG_AUDIT_LOG(logBasicAuthentication(
                userName,
                authInfo->getIpAddress(),
                false));
        break;
    }

    PEG_METHOD_EXIT();
    return AuthenticationStatus(authenticated);
}

AuthenticationStatus NegotiateAuthenticationHandler::validateUser(
    const String& userName,
    AuthenticationInfo* authInfo)
{
    return true;
}

String NegotiateAuthenticationHandler::getAuthResponseHeader(
    const String& authType,
    const String& userName,
    AuthenticationInfo* authInfo)
{
    PEG_METHOD_ENTER(TRC_AUTHENTICATION,
        "NegotiateAuthenticationHandler::getAuthResponseHeader()");

    String authResp = NEGOTIATE_AUTHENTICATION_CHALLENGE_HEADER;
    SharedPtr<NegotiateServerSession> session = authInfo->getNegotiateSession();
    String challenge = session->getChallenge();
    authResp.append(challenge);
    PEG_TRACE((TRC_AUTHENTICATION, Tracer::LEVEL4,
            "getAuthResponseHeader returning: %s",
            (const char*)authResp.getCString()));

    PEG_METHOD_EXIT();
    return authResp;
}

PEGASUS_NAMESPACE_END