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• Oracle with Kerberos authentication and Windows 2003 Server as KDC

  - by Supaplex

  I am running Oracle 10.2 on a Windows 2003 Server SP2 which is also the domain controller on the network. I wish to switch authentication method from NTS to Kerberos. I have spent a lot of time trying to configure Oracle with Kerberos authentication from the Oracle Advanced Security option from the Net Manager utility. I have disabled NTS so Kerberos is promoted as the preferred authentication method. But as soon as the configuration is saved from Net Manager and I restart the Oracle server service, Oracle will not start. I don't know what Oracle is complaining about, because I don't know where to look for the Oracle error log. My first question is: how can I figure out what's bugging Oracle? My second question: is there a good tutorial for setting up Oracle on a Windows 2003 with Kerberos Authentication, where the Windows 2003 Server is the KDC? Maybe there is a book I can get? I have read Oracles own guide, but it is mostly for Linux/Unix. Thanks a lot!

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• Why is squid breaking kerberos/NTLM auth?

  - by DonEstefan

  I'm using squid 2.6.22 (Centos 5 Default) as a proxy. Squid seems to break the authentication process for web pages when they require NTLM or Kerberos Auth. I tested with sharepoint 2007 and tried all 3 authentication methods (NTLM, Kerberos, Basic). Accessing the site without squid works in all cases. When I access the same page with squid, then only basic-auth works. Using IE or Firefox desn't make any difference. Squid itself can be used by anybody (no auth_param configured). Its a bit tricky to find solutions online, since most of the topics whirl around auth_param for authenticating users to squid rather than authenticating users to a webpage behind squid. Could anyone help? Edit: Sorry, but my first test was totally screwed up. I tested against the wrong webservers (Memo to myself: always check assumptions before testing). Now I realized that the problem scenario is completely different. Kerberos work for IE Kerberos works for Firefox (after changing "network.negotiate-auth.trusted-uris" in about:config) NTLM works for IE NTLM does NOT work in Firefox (even after changing "network.automatic-ntlm-auth.trusted-uris" in about:config) By the way: The feature that provides NTLM-passthrough in squid is called "connection pinning" and the HTTP header "Proxy-support: Session-based-authentication""

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• Oracle with Kerberos authentication and Windows 2003 Server as KDC

  - by Supaplex

  Hello everyone. I am running Oracle 10.2 on a Windows 2003 Server SP2 which is also the domain controller on the network. I wish to switch authentication method from NTS to Kerberos. I have spent a lot of time trying to configure Oracle with Kerberos authentication from the Oracle Advanced Security option from the Net Manager utility. I have disabled NTS so Kerberos is promoted as the preferred authentication method. But as soon as the configuration is saved from Net Manager and I restart the Oracle server service, Oracle will not start. I don't know what Oracle is complaining about, because I don't know where to look for the Oracle error log. My first question is: how can I figure out what's bugging Oracle? My second question: is there a good tutorial for setting up Oracle on a Windows 2003 with Kerberos Authentication, where the Windows 2003 Server is the KDC? Maybe there is a book I can get? I have read Oracles own guide, but it is mostly for Linux/Unix. Thanks a lot!

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• Multi- authentication scenario for a public internet service using Kerberos

  - by StrangeLoop

  I have a public web server which has users coming from internet (via HTTPS) and from a corporate intranet. I wish to use Kerberos authentication for the intranet users so that they would be automatically logged in the web application without the need to provide any login/password (assuming they are already logged to the Windows domain). For the users coming from internet I want to provide traditional basic/form- based authentication. User/password data for these users would be stored internally in a database used by the application. Web application will be configured to use Kerberos authentication for users coming from specific intranet ip networks and basic/form- based authentication will be used for the rest of the users. From a security perspective, are there some risks involved in this kind of setup or is this a generally accepted solution? My understanding is that server doesn't need access to KDC (see Kerberos authentication, service host and access to KDC) and it can be completely isolated from AD and corporate intranet. The server has a keytab file stored locally that is used to decrypt tickets sent by the users coming from intranet. The tickets only contain username and domain of the incoming user. Server never sees the passwords of authenticated users. If the server would be hacked and the keytab file compromised, it would mean that attacker could forge tickets for any domain user and get access to the web application as any user. But typically this is the case anyway if hacker gains access to the keytab file on the local filesystem. The encryption key contained in the keytab file is based on the service account password in AD and is in hashed form, I guess it is very difficult to brute force this password if strong Kerberos encryption like AES-256-SHA1 is used. As the server has no network access to intranet, even the compromised service account couldn't be directly used for anything.

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• Kerberos issues after new server of same name joined to domain

  - by MentalBlock

  Environment: Windows Server 2012, 2 Domain Controllers, 1 domain. A server called Sharepoint1 was joined to the domain (running Sharepoint 2013 using NTLM). The fresh install for Sharepoint1 (OS and Sharepoint) is performed and set up for Kerberos and joined to the domain using the same name. Two SPNs added for HTTP/sharepoint1 and HTTP/sharepoint1.somedomain.net for account SPFarm. Active Directory shows a single, non-duplicate computer account with a create date of the first server and a modify date of the second server creation. A separate server also on the domain has the server added to All Servers in Server Manager. This server shows a local error in the events exactly like This from Technet (Kerberos error 4 - KRB_AP_ERR_MODIFIED). Question: Can someone help me understand if the problem is: The computer account is still the old account and causing a Kerberos ticket mismatch (granted some housekeeping in AD might have prevented this) (In my limited understanding of Kerberos and SPNs) that the SPFarm account used for the SPNs is somehow mismatched with HTTP calls made by the remote server management tools services in Windows Server 2012 Something completely different? I am leaning towards the first one, since I tested the same SPNs on another server and it didn't seem to cause the same issue. If this is the case, can it be easily and safely repaired? Is there a proper way to either reset the account or better yet, delete and re-add the account? Although it sounds simple enough with some powershell or clicking around in AD Users and Computers, I am uncertain what impact this might have on an existing server, particularly one running SharePoint. What is the safest and simplest way to proceed? Thanks!

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• Kerberos SSO browser integration?

  - by MrZombie

  I'm installing a bunch of web apps for the office, and one of the wants would be Kerberos-managed SSO. Now, I have found some information on the matter, and I wondered, what browsers integrate Kerberos SSO? Of course I could just use the underlying web app to authenticate in case of lack of Kerberos capability, which is exactly the plan, but I'd like to know which browsers would work for that, so I can plan ahead and decide if it's even worth it to do that, which I believe it would considering that one of the web apps I'm implementing will be an ERP.

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• Setting up kerberos for SQL Server 2008 R2 not taking effect

  - by dotnetdev

  I am trying to configure Kerberos for my SQL Server (the database engine domain account). I have executed the following command: SETSPN -A MSSQLSvc/MyDBServer:1433 MyDomain\SQLServerService Replacing MyDBServer with the FQDN of the server and replacing MyDomain\SQLServerService with the name of my account. I then ran the query: SELECT s.session_id , c.connect_time , s.login_time , s.login_name , c.protocol_type , c.auth_scheme , s.HOST_NAME , s.program_name FROM sys.dm_exec_sessions s JOIN sys.dm_exec_connections c ON s.session_id = c.session_id This returns NTLM. So it's not Kerberos. What am I mising? The delegation tab is available for the account, so the spn bit worked perfectly fine. Is it not required to set some settings in the delegation tab? I've seen this in the case of setting kerberos for Sharepoint 2010 (which I intend to setup). Thanks

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• Get Kerberos ticket with SSH

  - by Joel

  I'd like to get a Kerberos 5 ticket when ssh-ing to get to a fully-automated login solution. Typically, you use kinit first and then ssh: > kinit user@DOMAIN user@DOMAIN's Password: (enter password) > ssh user@host (successful login) I'd like to simply run ssh user@host and automatically check for a Kerberos ticket. If one isn't there, I'd like it to get a ticket and then log in. > kdestroy > ssh user@host user@DOMAIN's Password: (enter password) (successful login) (log off of host) > klist (show ticket info) I'd like this to be configured on a per-host basis, as not every host I log into supports Kerberos.

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• Is there a Kerberos testing tool?

  - by ixe013

  I often use openssl s_client to test and debug SSL connections (to LDAPS or HTTPS services). It allows me to isolate the problem down to SSL, without anything getting in the way. I know about klist that allows me to purge the ticket cache. Is there tool that would allow me to ask a Kerberos ticket for a given server, not event sending it ? Just enough to see the whole Kerberos exchange in Wireshark for example ?

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• Cannot delete files on samba share when authenticated using kerberos

  - by ondra

  I have a samba server that authenticates users using LDAP, however it does have kerberos enabled as well. Unfortunately users authenticated using kerberos cannot delete files. I can test this using smbclient - if I use the '-k' switch, I cannot delete the files, if I don't, I can. The users does have read/write/execute access to the directory from where he is trying to delete the file. Any idea what might be wrong?

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• How does Kerberos work with SSH?

  - by Phil

  Suppose I have four computers, Laptop, Server1, Server2, Kerberos server: I log in using PuTTY or SSH from L to S1, giving my username / password From S1 I then SSH to S2. No password is needed as Kerberos authenticates me Describe all the important SSH and KRB5 protocol exchanges: "L sends username to S1", "K sends ... to S1" etc. (This question is intended to be community-edited; please improve it for the non-expert reader.)

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• RPCSS kerberos issues on imaged Windows workstations

  - by sysadmin1138

  While doing some unrelated troubleshooting I came across a set of Event Log entries that have me concerned. Machine Name: labcomputer82 Source: Security-Kerberos Event ID: 4 Event Description: The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server labcomputer143$. The target name used was RPCSS/imagemaster4.ad.domain.edu. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when the target server principal name (SPN) is registered on an account other than the account the target service is using. Please ensure that the target SPN is registered on, and only registered on, the account used by the server. This error can also happen when the target service is using a different password for the target service account than what the Kerberos Key Distribution Center (KDC) has for the target service account. Please ensure that the service on the server and the KDC are both updated to use the current password. If the server name is not fully qualified, and the target domain (AD.DOMAIN.EDU) is different from the client domain (AD.DOMAIN.EDU), check if there are identically named server accounts in these two domains, or use the fully-qualified name to identify the server. There are three machine names used in this message. It's generated on labcomputer82, it's attempting to talk to another lab workstation called labcomputer143, and the service in question (RPCSS) refers to the name of the machine that this machine was imaged from (and possibly also that of labcomputer143, I'm not sure). The thing that has me raising both eyebrows is that the machine named labcomputer82 is attempting to use an SPN of RPCSS/imagemaster4.ad.domain.edu. The SPN attribute on the computer object in AD looks just fine. It has all the names it should have. Of the over 3,000 computer objects in our AD domain, somewhere around 1,700 of the are computer-lab seats that are frequently imaged. If we're doing something wrong, I'd like to know in time to get our procedures modified (and people retrained) for fall quarter. But if this is normal for imaged machines, I'll just continue ignoring these.

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• Kerberos authentication not working for one single domain

  - by Buddy Casino

  We have a strange problem regarding Kerberos authentication with Apache mod_auth_kerb. We use a very simple krb5.conf, where only a single (main) AD server is configured. There are many domains in the forest, and it seems that SSO is working for most of them, except one. I don't know what is special about that domain, the error message that I see in the Apache logs is "Server not found in Kerberos database": [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(1025): [client xx.xxx.xxx.xxx] Using HTTP/[email protected] as server principal for password verification [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(714): [client xx.xxx.xxx.xxx] Trying to get TGT for user [email protected] [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(625): [client xx.xxx.xxx.xxx] Trying to verify authenticity of KDC using principal HTTP/[email protected] [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(640): [client xx.xxx.xxx.xxx] krb5_get_credentials() failed when verifying KDC [Wed Aug 31 14:56:02 2011] [error] [client xx.xxx.xxx.xxx] failed to verify krb5 credentials: Server not found in Kerberos database [Wed Aug 31 14:56:02 2011] [debug] src/mod_auth_kerb.c(1110): [client xx.xxx.xxx.xxx] kerb_authenticate_user_krb5pwd ret=401 user=(NULL) authtype=(NULL) When I try to kinit that user on the machine on which Apache is running, it works. I also checked that DNS lookups work, including reverse lookup. Who can tell me whats going?

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• End-to-end kerberos delegated authentication in ASP.NET

  - by Erlend

  I'm trying to setup an internal website that will contact another backend service within the network on behalf of the user using a HttpWebRequest. I have to use Integrated Windows Authentication on the ASP.NET application as the backend system only supports this type of authentication. I'm able to setup IWA on the ASP.NET application, and it's using kerberos as I expect it to. However when the authentication is delegated to the backend system it doesn't work anymore. This is because the backend system only supports kerberos IWA, but the delegation for some reason - even though the incoming request is kerberos authenticated - converts the authentication to NTLM before forwaring to the backend system. Does anybody know what I need to do on the ASP.NET application in order to allow it to forward the identity using kerberos? I've currently tried the followin but it doesn't seem to work CredentialCache credentialCache = new CredentialCache(); credentialCache.Add(request.RequestUri, "Negotiate", CredentialCache.DefaultCredentials.GetCredential(request.RequestUri, "Kerberos")); request.Credentials = credentialCache; I've also tried to set "Kerberos" where it now says "Negotiate", but it doesn't seem to do much.

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• kinit gives me a Kerberos ticket, but no AFS token

  - by Tomas Lycken

  I'm trying to setup access to my university's IT environment from my laptop running Ubuntu 12.04, by (mostly) following the IT-department's guides on AFS and Kerberos. I can get AFS working well enough so that I can navigate to my home folder (located in the nada.kth.se cell of AFS), and I can get Kerberos working well enough to forward tickets and authenticate me when I connect with ssh. However, I don't seem to get any AFS tokens locally, on my machine, so I can't just go to /afs/nada.kth.se/.../folder/file.txt on my machine and edit it. I can't even stand in /afs/nada.kth.se/.../folder and run ls without getting Permission denied errors. Why doesn't kinit -f [email protected] give me an AFS token? What do I need to do to get one?

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• Kerberos authentication between 2 applications

  - by Spivi

  We work on a server 2003 and server 2008 R2 enviroment. I'm familiar with the basic usage of the Kerberos protocol where the protocol authenticates a client when he tries to use a shared resource (server, folder, printer, etc.). We have three distinct and independent .NET applications that we develop inhouse (app A, app B & app C) but they need to communicate for a given reason (A recieves messages only from B and C and C recieves messages only from B). Is it possible to configure the Kerberos services to authenticate messages/request between two .NET apps ? (Instead of a user-server authentication, we will have an application-application authentication)

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• Tool to allow Kerberos Authenticated users to modify Firewall settings

  - by Lars Hanke

  I run a firewall on a central router. Recently, several users want to use Skype. Since firewalling Skype virtually means to switch the firewall off, I consider to allow users to temporarily punch holes for their system. Since the users have no accounts on the router, I consider using Kerberos for authentication and authorization. The router is a Debian Squeeze box, with minimal configuration, i.e. no web-server, database or similar gimmicks. Does anyone know an existing solution, which could be used for that purpose? Or does anybody know easy to use and well documented frameworks in say Perl, Python, C, C++, ... making the set-up of a Kerberos authenticated Client and Server application really simple?

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• Cannot get to configure Kerberos for Reporting Services

  - by Ucodia

  Context I am trying to configure Kerberos in the domain for double-hop authentication. So here are the machines and their respective roles: client01: Windows 7 as client dc01: Windows Server 2008 R2 as domain controller and dns server01: Windows Server 2008 R2 as reporting server (native mode) server02: Windows Server 2008 R2 as SQL Server database engine I want my client01 to connect to server01 and configure a data source that is located on server02 using Intergrated Security. So as NTLM cannot push credentials that far, I need to setup Kerberos to enable double-hop authentication. The reporting service is runned by the Network Service service account and is configured only with the RSWindowsNegotiate options for authentication. Issue I cannot get to pass my client01 credential to server02 when configuring the data source on server01. Therefore I get the error: Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. So I went on dc01 and delegated full trust for any service to server01 but it not fixed the problem. I want to notice that I did not configured any SPNs for server01 because Reporting Service is runned by Network Service and from what I read on the Internet, when Reporting Services is going up with Network Service, SPNs are automatically registered. My problem is that even if that I want to configure SPNs manually, I do not know where I have to set them up. On dc01 or on server01? So I went a bit further on the issue and tried to trace this problem. From my understanding of Kerberos, this is what should happen on the network when I try to connect the data source: client01 ---- AS_REQ ---> dc01 <--- AS_REP ---- client01 ---- TGS_REQ ---> dc01 <--- TGS_REP ---- client01 ---- AP_REQ ---> server01 <--- AP_REP ---- server01 ---- TGS_REQ ---> dc01 <--- TGS_REP ---- server01 ---- AP_REQ ---> server02 <--- AP_REP ---- So captured my local network with Wireshark, but whenever I try to configure my data source from client01 on server01 to pass my credentials to server02, my client never sends a AS_REQ or TGS_REQ to the KDC on dc01. Questions So does anyone can tell me if I should configure the SPNs and on which machine does it have to be configured? Also why client01 never request for a TGT or a TGS to my KDC. Do you think there is something going wrong with the DC role of dc01?

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• Single Sign On for intranet with Apache and Linux MIT Kerberos

  - by Beerdude26

  Greetings, I am looking for a way to do a single sign on to an intranet in the following manner: A Linux user logs on via a graphical frontend (for example, GNOME). He automatically requests a TGT for his username from the MIT Kerberos KDC. Via some way or another, the Apache server (which we'll assume is on the same server as the KDC), is informed that this user has logged in. When the user accesses the intranet, he is automatically granted access to his web applications. I don't think I've seen this kind of functionality while searching the net. I know the following possibilities exist: Using an authentication module such as mod_auth_kerb, a user is presented with a login prompt to enter his username and password, which are then authenticated against the MIT Kerberos server. (I would like this to be automatic.) IIS supports integrated Windows logon via ASP.Net when the user is part of an Active Directory. (I'm looking for the Linux / Apache equivalent.) Any suggestions, criticism and ideas are highly appreciated. This is for a school project to show a proof-of-concept, so every handy piece of information is more than welcome. :)

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• [SOLVED] Single Sign On for intranet with Apache and Linux MIT Kerberos

  - by Beerdude26

  EDIT: SOLVED! See my answer below. Greetings, I am looking for a way to do a single sign on to an intranet in the following manner: A Linux user logs on via a graphical frontend (for example, GNOME). He automatically requests a TGT for his username from the MIT Kerberos KDC. Via some way or another, the Apache server (which we'll assume is on the same server as the KDC), is informed that this user has logged in. When the user accesses the intranet, he is automatically granted access to his web applications. I don't think I've seen this kind of functionality while searching the net. I know the following possibilities exist: Using an authentication module such as mod_auth_kerb, a user is presented with a login prompt to enter his username and password, which are then authenticated against the MIT Kerberos server. (I would like this to be automatic.) IIS supports integrated Windows logon via ASP.Net when the user is part of an Active Directory. (I'm looking for the Linux / Apache equivalent.) Any suggestions, criticism and ideas are highly appreciated. This is for a school project to show a proof-of-concept, so every handy piece of information is more than welcome. :)

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• Immediate logout after login with PAM, Kerberos, and LDAP

  - by Dylan Klomparens

  I've set up remote login on a computer using Kerberos and LDAP. I've also configured NFS to mount onto /home so that the user's home directory is the same wherever they login. Kerberos authentication seems to work fine. I can get a ticket using kinit user1 (assuming user1 is a remote user) and see the ticket with klist. I'm pretty sure LDAP is working because I see the proper output from getent passwd, which lists all the remote users. The contents of /home are present when I list the files. The problem is: when I try to login as a remote user the session is immediately ended. Why is it not letting me stay logged in? Here is the output from /var/log/messages after a login attempt: # /var/log/messages: Oct 9 10:57:53 tophat login[6472]: pam_krb5[6472]: authentication succeeds for 'user1' ([email protected]) Oct 9 10:57:53 tophat login[6472]: pam_krb5[6472]: pam_setcred (establish credential) called Oct 9 10:57:53 tophat login[6472]: pam_krb5[6472]: pam_setcred (delete credential) called EDIT: The distro is openSUSE. Here are the common-* files in /etc/pam.d:   # /etc/pam.d/common-account account required pam_unix.so   # /etc/pam.d/common-auth auth sufficient pam_krb5.so minimum_uid=1000 auth required pam_unix.so nullok_secure try_first_pass   # /etc/pam.d/common-session session optional pam_umask.so umask=002 session sufficient pam_krb5.so minimum_uid=1000 session required pam_unix.so There doesn't appear to be a /var/log/auth.log file nor a /var/log/secure file.

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• Using Kerberos authentication for SQL Server 2008

  - by vivek m

  I am trying to configure my SQL Server to use Kerberos authentication. My setup is like this - My setup is like this- I have 2 virtual PCs in a Windows XP Pro SP3 host. Both VPCs are Windows Server 2003 R2. One VPC acts as the DC, DNS Server, DHCP server, has Active Directory installed and the SQL Server default instance is also running on this VPC. The second VPC is the domain member and it acts as the SQL Server client machine. I configured the SPN on the SQL Server service account to get the Kerberos working. On the client VPC it seems like it is using Kerberos authentication (as desired)- C:\Documents and Settings\administrator.SHAREPOINTSVC>sqlcmd -S vm-winsrvr2003 1> select auth_scheme from sys.dm_exec_connections where session_id=@@spid 2> go auth_scheme ---------------------------------------- KERBEROS (1 rows affected) 1> but on the server computer (where the SQL Server instance is actually running) it looks like it is still using NTLM authentication- . This is not a remote instance, the sql server is local to this machine. C:\Documents and Settings\Administrator>sqlcmd 1> select auth_scheme from sys.dm_exec_connections where session_id=@@spid 2> go auth_scheme ---------------------------------------- NTLM (1 rows affected) 1> What can i do so that it uses Kerberos on the server computer as well ? (or is this something that I should not expect)

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• Relative security of SAML vs Kerberos

  - by Robert Gowland

  Does anyone have any info/links on the relative security of SAML vs Kerberos. I believe I grasp the differences between the two, and what they mean for my particular application, but to decided between the two, knowing which is more secure, if either, would be a valuable bit of info.

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• Windows Vista and 7 crossrealm authentication MIT Kerberos

  - by fox8

  I'm using Windows Server 2008 and Windows Vista and 7 for cross realm authentication using MIT Kerberos 1.6 but when i try to login with a user the KDC answers: (wireshark output) error_code: KRB5KDC_ERR_ETYPE_NOSUPP (14) ... e-text: BAD_ENCRYPTION_TYPE I want to know how can I change the encryption type method to be compatible with the KDC (i tried a XP client and it worked fine). Many thanks!

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• Windows Vista and 7 crossrealm authentication MIT Kerberos

  - by fox8

  I'm using Windows Server 2008 and Windows Vista and 7 for cross realm authentication using MIT Kerberos 1.6 but when i try to login with a user the KDC answers: (wireshark output) error_code: KRB5KDC_ERR_ETYPE_NOSUPP (14) ... e-text: BAD_ENCRYPTION_TYPE I want to know how can I change the encryption type method to be compatible with the KDC (i tried a XP client and it worked fine). (posted this yesterday on superuser, but I guess this is more a serverfault question) Can anyone help me on this ? Many thanks!

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