Program: 99246
Project: 99246
Buggy source:
@Override public boolean authenticate(final Request request,final Response response,final LoginConfig loginConfig){
  Principal principal=request.getUserPrincipal();
  final AuthorizationHeader authorizationHeader=new AuthorizationHeader(request);
  final boolean ntlmPost=authorizationHeader.isNtlmType1PostAuthorizationHeader();
  this.log.debug("String_Node_Str",request.getMethod(),request.getRequestURI(),Integer.valueOf(request.getContentLength()));
  this.log.debug("String_Node_Str",authorizationHeader,Boolean.valueOf(ntlmPost));
  if (principal != null && !ntlmPost) {
    this.log.debug("String_Node_Str",principal.getName());
    return true;
  }
  if (!authorizationHeader.isNull()) {
    final String securityPackage=authorizationHeader.getSecurityPackage();
    final String connectionId=NtlmServletRequest.getConnectionId(request);
    this.log.debug("String_Node_Str",securityPackage,connectionId);
    if (ntlmPost) {
      this.auth.resetSecurityToken(connectionId);
    }
    IWindowsSecurityContext securityContext;
    try {
      byte[] tokenBuffer=authorizationHeader.getTokenBytes();
      this.log.debug("String_Node_Str",Integer.valueOf(tokenBuffer.length));
      securityContext=this.auth.acceptSecurityToken(connectionId,tokenBuffer,securityPackage);
      this.log.debug("String_Node_Str",Boolean.valueOf(securityContext.isContinue()));
      final byte[] continueTokenBytes=securityContext.getToken();
      if (continueTokenBytes != null && continueTokenBytes.length > 0) {
        final String continueToken=BaseEncoding.base64().encode(continueTokenBytes);
        this.log.debug("String_Node_Str",continueToken);
        response.addHeader("String_Node_Str",securityPackage + "String_Node_Str" + continueToken);
      }
      if (securityContext.isContinue() || ntlmPost) {
        response.setHeader("String_Node_Str","String_Node_Str");
        response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
        response.flushBuffer();
        return false;
      }
    }
 catch (    IOException e) {
      this.log.warn("String_Node_Str",e.getMessage());
      this.log.trace("String_Node_Str",e);
      sendUnauthorized(response);
      return false;
    }
    if (this.context == null || this.context.getRealm() == null) {
      this.log.warn("String_Node_Str");
      sendError(response,HttpServletResponse.SC_SERVICE_UNAVAILABLE);
      return false;
    }
    final IWindowsIdentity windowsIdentity=securityContext.getIdentity();
    if (!this.allowGuestLogin && windowsIdentity.isGuest()) {
      this.log.warn("String_Node_Str",windowsIdentity.getFqn());
      sendUnauthorized(response);
      return false;
    }
    try {
      this.log.debug("String_Node_Str",windowsIdentity.getFqn(),windowsIdentity.getSidString());
      final GenericWindowsPrincipal windowsPrincipal=new GenericWindowsPrincipal(windowsIdentity,this.context.getRealm(),this.principalFormat,this.roleFormat);
      this.log.debug("String_Node_Str",windowsPrincipal.getRolesString());
      principal=windowsPrincipal;
      final HttpSession session=request.getSession(true);
      this.log.debug("String_Node_Str",session.getId());
      register(request,response,principal,securityPackage,principal.getName(),null);
      this.log.info("String_Node_Str",principal.getName());
    }
  finally {
      windowsIdentity.dispose();
    }
    return true;
  }
  this.log.debug("String_Node_Str");
  sendUnauthorized(response);
  return false;
}

Fixed version (ground truth):
@Override public boolean authenticate(final Request request,final Response response,final LoginConfig loginConfig){
  Principal principal=request.getUserPrincipal();
  final AuthorizationHeader authorizationHeader=new AuthorizationHeader(request);
  final boolean ntlmPost=authorizationHeader.isNtlmType1PostAuthorizationHeader();
  this.log.debug("String_Node_Str",request.getMethod(),request.getRequestURI(),Integer.valueOf(request.getContentLength()));
  this.log.debug("String_Node_Str",authorizationHeader,Boolean.valueOf(ntlmPost));
  if (principal != null && !ntlmPost) {
    this.log.debug("String_Node_Str",principal.getName());
    return true;
  }
  if (!authorizationHeader.isNull()) {
    final String securityPackage=authorizationHeader.getSecurityPackage();
    final String connectionId=NtlmServletRequest.getConnectionId(request);
    this.log.debug("String_Node_Str",securityPackage,connectionId);
    if (ntlmPost) {
      this.auth.resetSecurityToken(connectionId);
    }
    IWindowsSecurityContext securityContext;
    try {
      byte[] tokenBuffer=authorizationHeader.getTokenBytes();
      this.log.debug("String_Node_Str",Integer.valueOf(tokenBuffer.length));
      securityContext=this.auth.acceptSecurityToken(connectionId,tokenBuffer,securityPackage);
      this.log.debug("String_Node_Str",Boolean.valueOf(securityContext.isContinue()));
      final byte[] continueTokenBytes=securityContext.getToken();
      if (continueTokenBytes != null && continueTokenBytes.length > 0) {
        final String continueToken=BaseEncoding.base64().encode(continueTokenBytes);
        this.log.debug("String_Node_Str",continueToken);
        response.addHeader("String_Node_Str",securityPackage + "String_Node_Str" + continueToken);
      }
      if (securityContext.isContinue() || ntlmPost) {
        response.setHeader("String_Node_Str","String_Node_Str");
        response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
        response.flushBuffer();
        return false;
      }
    }
 catch (    IOException e) {
      this.log.warn("String_Node_Str",e.getMessage());
      this.log.trace("String_Node_Str",e);
      sendUnauthorized(response);
      return false;
    }
    if (this.context == null || this.context.getRealm() == null) {
      this.log.warn("String_Node_Str");
      sendError(response,HttpServletResponse.SC_SERVICE_UNAVAILABLE);
      return false;
    }
    final IWindowsIdentity windowsIdentity=securityContext.getIdentity();
    if (!this.allowGuestLogin && windowsIdentity.isGuest()) {
      this.log.warn("String_Node_Str",windowsIdentity.getFqn());
      sendUnauthorized(response);
      return false;
    }
    try {
      this.log.debug("String_Node_Str",windowsIdentity.getFqn(),windowsIdentity.getSidString());
      final GenericWindowsPrincipal windowsPrincipal=new GenericWindowsPrincipal(windowsIdentity,this.context.getRealm(),this.principalFormat,this.roleFormat);
      this.log.debug("String_Node_Str",windowsPrincipal.getRolesString());
      principal=windowsPrincipal;
      final HttpSession session=request.getSession(true);
      this.log.debug("String_Node_Str",session == null ? "String_Node_Str" : session.getId());
      register(request,response,principal,securityPackage,principal.getName(),null);
      this.log.info("String_Node_Str",principal.getName());
    }
  finally {
      windowsIdentity.dispose();
    }
    return true;
  }
  this.log.debug("String_Node_Str");
  sendUnauthorized(response);
  return false;
}