SPNEGO/Kerberos No credential found error with requests from Linux client - java

I am currently implementing a single signon solution for a customer that is based on Java, Tomcat and Kerberos.
Users are to access the URL of an intranet Tomcat application from their client browsers, the Tomcat application acquires the users' credentials via Kerberos and redirects them to the actual web application.
Our customer's environment is a typical mixture of a Windows AD server acting as the KDC and Linux Tomcat application servers. The SSO functionality is supposed to be used from both Windows and Linux clients. This is what appears to be different from most answers I can find on the net where people have Linux web application servers but only use Windows clients.
Now, in my local setup I get some strange behaviour. My development environment is a Tomcat 7.0.26 running from MyEclipse 8.6 under Windows 7. My test environment is a Tomcat 7.0.26 or 7.0.53 behind an Apache web server on a Centos 6 machine. I have set up the AD server correctly, generated the necessary keytab files etc. and everything is running smoothly in the development environment. I can access the Tomcat application from both Linux and Windows clients using IE and Firefox, Kerberos authentication proceeds and I get redirected properly.
When deploying the Tomcat application on the test server this keeps working when trying to sign on from Windows clients. However, when I try to access the test server from a Linux client (I have tried from Linux Mint 13 and Ubuntu 13.10), I get the following error:
javax.servlet.ServletException: GSSException: No credential found for: 1.3.6.1.5.2.51.3.6.1.5.2.5 usage: Accept
net.sourceforge.spnego.SpnegoHttpFilter.doFilter(SpnegoHttpFilter.java:233)
I have to admit that I do not properly understand this message. Does it point to a problem with the credentials supplied by the client or a problem with the application server negotiating with the KDC? I have done some research on this problem and have found out that the indicated oid 1.3.6.1.5.2.5 stands for GSS_IAKERB_MECHANISM and not GSS_KRB5_MECHANISM or GSS_SPNEGO_MECHANISM which I find strange. Also, nobody else appears to have exactly the same problem.
I have tried switching from MIT Kerberos to Heimdal Kerberos and back. I have tried Firefox and Chromium, on the application server I have switched between Tomcat 7.0.26 and 7.0.53, the problem still persists. I am using the latest spnego.jar.
Now: Calls from Linux to the Tomcat running on the Windows development machine succeed and calls from Linux clients to the Linux application server fail with the same error message for both browsers tried.
Any ideas on this one?

GSS_IAKERB_MECHANISM means that the client is not able to determine the realm/kdc to create a service ticket and asks the server to serve as an intermediate to the target KDC. Check Wireshark traffic. Your task now is to analyze why the client is not able to create a service ticket for that SPN. I have observed this issue on Heimdal on FreeBSD with Microsoft KDC.
So the problem ist not your Tomcat instance.

Related

REST API Client in Tomcat returning ConnectionTimedOut

In the client environment tomcat is running as a service with logon account as Local System Account. I have deployed a java based REST API client application in that tomcat. Every time the client is running its not able to set up connection with the destination.
In the client environment tomcat is running as a service with logon account as Local System Account. I have deployed a java based REST API client application in that tomcat. Every time the client is running its not able to set up connection with the destination.
There is absolutely no issue with the destination endpoint and the java code, as in other environments, that client is running fine in the tomcat.
Error that we are seeing is -- ConnectionTimeOut.
Account that the tomcat is running under in the client environment is -- Local System Account.
This is a huge road blocker and if anybody can provide guidance will be extremely helpful.
Error that we are seeing is -- ConnectionTimeOut.
Definitely it might be firewall issue. Your client is not able to connect to server, where your service is running. You need to ping from client machine to server where service is running. That will tells you whether Connectivity established or not.

IIS and WebSphere on separate servers does not serve jsp pages

Short Background
We have two servers (Windows Server 2008). ServerA is an IBM WebSphere Application Server and ServerB is an IIS 7 webserver that points to applications on ServerA. It currently works. We want to upgrade ServerB to Server 2012, but cannot do an in place upgrade, so we are installing it on a new server (ServerC) and replacing ServerB with it.
We cannot use Tomcat, and the original setup works properly (Internet <--> ServerB (WebServer) <--> ServerA (Application Server).
My questions are (All of these apply to what happens after we swap out ServerB with ServerC):
1) Is there a way to test if a webserver is correctly configured to serve the websphere apps? I think my biggest barrier is that we cannot use the server machine to browse to any sites (I believe it is a group policy...but again, I'm just a software dev and not as knowledgeable about server configurations and system administration). The applications that we can use on the server are very limited, but I have seen some things about using Snoop (which I do not know how to use, but could find out...but I don't think we are allowed to install it on the machine anyway.)
2) When I navigate to a site hosted on IIS that points to a WebSphere application that redirects me to a Login.jsp page, why is the browser trying to download the .jsp file instead of displaying it as a web page? I have not been able to find good google/stackoverflow/serverfault results on a search for why a site hosted on IIS pointing to a WebSphere application server does not display JSP pages, but instead prompts to download the .jsp file.
3) When I try to navigate to some sites hosted on IIS that points to a WebSphere application, why would I receive a 403 Access Denied error on the new IIS server, but not the old server? The folders that the web apps have access to are located on either the local machine (separate drive letter) and the WebSphere application server. All of the local folders on the new server have been configured the same way as on the old server, and all of the local users and groups are setup the same.
Setup Information (More Detailed)
In this part, I would like to show our setup: We have two servers (Windows Server 2008). ServerA is an IBM WebSphere Application Server and ServerB is an IIS 7 webserver. This setup was around before anyone that is currently working at my organization (including myself) started. There are 7 sites configured/setup on IIS with virtual paths (that is, the site is named www.site_name.ourorg.domain). We have an IP address configured on the outward facing NIC for each of the sites and each site has a binding to its specific ip address with port 80 and port 443 (with valid certificates) and their own application pools. We do not have access to configure the domain controller (we are given the IPs to use and someone at a different organization manages our domain server). All of the sites are currently in production and in use on a daily basis.
The Goal
Our goal is to stand up a new Windows Server 2012 webserver (and eventually application server as well). Unfortunately, we cannot do an in-place upgrade, so our System Admin decided that probably the best route would be to setup a new server (ServerC), do a clean install of Windows Server 2012, install IIS7 using the same features and roles that are on ServerB, install IBM WebSphere Plugins and use the same plugin-cfg.xml file. (Later on, when this failed, we reinstalled the WebSphere Plugins as well as the Configuration Tool and creating a new configuration using that, per the instructions in the WebSphere site noted below.) Then, once it is installed and everything appears to be configured the same, disable the outward facing NIC on the existing webserver (ServerB), rename it (since we use Active Directory) to a new name (ServerB-o), rename ServerC to ServerB, and enable the NIC on ServerC (now called ServerB) using the same IP and configuration as the old ServerB (ServerB-o).
The Issue
After we do all of this, we can access IIS (default page, which will be disabled after testing), and it looks like the sites pointing to WebSphere are responding to requests, but we are running into two issues:
1) Some of the sites are returning a 403 Access Denied; The application pools are running as ApplicationPoolIdentity and all of the ApplicationPools (IIS APPPOOL\www.site_name.ourorg.domain) are added to the IUSR group. One peculiartity is when we are setting up the sePlugins virtual folder (for example) and choosing "Connect As...", we cannot use .\localadmin nor localadmin (both are admin users on the webserver). It tells us that the account name or password are incorrect. The old server is configured like this, though.
2) For any site that does not give the 403 error, instead of displaying the translated .jsp page, the browser prompts to download the .jsp file.
Other Information and Attempts
After trying to change the configuration on IIS and the WebSphere plugin multiple times, using a service account (on our AD) instead of .\localadmin, and a few days of research, I have realized that I do not know enough about how to configure servers, especially in this setup, to be of any more help. We are able to do the reverse (disable NIC on new ServerB, rename it to ServerC, rename ServerB-o back to ServerB, and re-enable the NIC), the sites come back up after somewhere between 15 minutes and 3 hours...
I just remembered that there was a part where I had to compare the ApplicationHost.config files and found that the ISAPI filters were not properly set on the new server, but am pretty sure I got everything configured on the new IIS the same as on the old IIS. The only thing that didn't get installed was HipIISEngineStub.dll, which seems like a McAfee-related dll (host intrusion prevention). It is on the old webserver, but not the new.
We have tried standing up the new server 3 times, and I have done more research in between each issue and was able to resolve all of them but this one. Each time we try to stand up the new server, we have to take down production for the remainder of the day, so I would prefer to be able to find a way to test it without taking production down.
One More Note
One last note is the most recent thing I was able to do was setup the configuration on ServerC, leave the outward facing NIC disabled, create a new site using the same physical path and configuration setup, except that it binds all unassigned IP addresses and an unused port (let's say 11111, for example) to one of the apps. I added the sePlugins virtual directory to it, and tested it from another workstation on the same domain by going to https://ServerC:11111. That successfully redirected my to the https://www.site_name.ourorg.domain/app_sub/Login.jsp <- which is being served by the old machine. I don't really know what this test means, other than the new IIS being able to read the configuration file and perform the appropriate steps for redirecting.
Resources
When installing WebSphere on the new webserver, I followed the steps at IBM's Site.
I have seen countless resources for the other issues I had, such as adding the AppPools to the IUSR group, configuring an app pool to run as a specific identity, how having the multiple IPs on a NIC and have them bound to sites in IIS works, and other manner of sys admin stuff that I am not familiar with, nor fully grasp.
I would greatly appreciate any assistance with getting a new server setup to properly server jsp pages using WebSphere. Even if you have a resource for completely uninstalling and reinstalling WebSphere on the new machine. I am hesitant to make any configuration changes on the WebSphere Application server itself, since we can easily roll back to the using the old webserver and the sites come back up. However, I am open to suggestions if that is where the issue is.
Once again, I apologize for posting a question that seemed to have too large a scope. I was able to get in contact with IBM support. The short answer is that while I had many other configuration issues, there were two main items preventing me from successfully serving the websites.
First, I had installed only the application server (Base installation) instead of the Network Deployment installation. This meant that there were more steps needed so that the application server to serve multiple applications to the web server. This was resolved by following the steps in this tech note. It involved setting up one plugin_root\bin\AppName and one plugin_root\config\AppName folder (and optionally in the log folder as well) on the web server for each WebSphere application; as well as modifying the configuration file (plugin_root\bin\plugin-cfg.loc and plugin_root\config\plugin-cfg.xml) for each specific app. Then, I needed to remove the ISAPI filter entry at the server level (in IIS Manager), and add the entry to the ISAPI filter for each site. I also needed to change the permissions on the Handlers Mappings in the sePlugins virtual folder to allow Read and Execute (one of the main reasons for the 403 errors).
The second issue was that I needed to add the ports that I was using for the test sites to the virtual hosts list using the Administrative Console, regenerating the plugins, and copying them to the web server (to the appropriate folders).
After getting everything up and running (and taking a snapshot of the server), I uninstalled everything and reinstalled WebSphere using the instructions listed in the resources section of my question, except I installed and configured it using the Network Deployment installation. This meant that I could have the ISAPI filter set at the server level in IIS manager, and have one folder to hold the iisWASPlugin file and associated loc, config, and log files. It turns out that I needed to set the permissions in the Handler Mappings for the sePlugins folder for each app to Read, Script, and Execute (having it just Script and Execute did not work for our setup), as well as making sure the ports were added to the Virtual Hosts list (therefore adding them to the config file).
I hope this helps someone in the future.

Run Jetty Website on Azure Virtual Machine

I have created a Java Web Application using Jetty (in Eclipse, using OSGI etc.). The application itself runs quite well (when being tested locally), so I wanted to run it on an Azure virtual machine in order to be accessible for external users (for testing reasons).
What I did so far:
created an Azure account
create a virtual machine with Windows Server running in it
downloaded all my eclipse files etc. to the virtual machine
started the application (in fact in eclipse, not the compiled jar) in the virtual machine; the application is published to port 8080
so, when i run a webbrowser in the VM and connect to localhost:8080, everything works well
but when I try to access the website from external (using my assigned domain of the VM, something.cloudapp.net:8080), it does not work
I also created endpoints in the azure management console for this VM (80, 8080, etc.)
Does anyone ever tried to run a java webapp on Azure or has a hint what could go wrong here?
By default, windows servers in Azure have the windows firewall enabled. This would block external connections to port 8080 by default. Try adding an appropriate exception to the windows firewall rules.
According to your description, I think you have correctly configured the new endpoints for the network traffic of Java Webapp. If not or incorrectly does, please refer to the article https://azure.microsoft.com/en-us/documentation/articles/virtual-networks-create-nsg-arm-pportal/ to configure again.
Then, as #CtrlDot said, you need to configure the firewall for allowing the inbound traffic on Windows Server.
As reference, please see the article about allowing inbound traffic to a specified TCP or UDP port on Windows Server to do it.

Openshift Connect To MySQL From Local Java Application

I'm using a scalable app on openshift and I'm trying to access its database from a local app but I am having trouble setting up the connection. I need to access my MySql 5.5 database.
IDE: Netbeans 7.4
I am using the environment variable values for the connection. I have no trouble connecting to it using my JBoss app in Openshift. Any help would be much appreciated. Sorry for the incomplete info. I am new here in SOF.
If you have the rhc client installed (see Client Tools Installation Guide if not), you can have it port forward to the server via rhc port-froward. Use localhost as the Host and port number it tells you, with the user name and password supplied from the application page.
Note this will only work when running locally, and the the rhc command will have to be running as well
See also 10.13. Port Forwarding

jboss 4 505 error http version not supported on VPN

We are calling a web service (jaxws) running on JBoss 4 from one of our .NET, C#, web services clients. It is working just fine on our local network, but as soon as we connect to our VPN to test on the production environment it throws a 505 error (HTTP version not supported). On both our local and production machines, we have tested the services from a Java client while still connecting to VPN and it's working fine for the java client
Any hint regarding this issue?
I would guess that your production web server is not configured the same as your test web server; it is more restrictive and not allowing the HTTP version that you want. Ask the server admin for your production server what versions of HTTP are supported.
Another possibility is that on the VPN you have an intermediate proxy that is converting your request from one version of HTTP to another. Ask a network admin for help.

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