Using Kerberos the fundamentals. Computer/Network Security needs: Authentication Who is requesting access Authorization What user is allowed to do Auditing.

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Presentation transcript:

Using Kerberos the fundamentals

Computer/Network Security needs: Authentication Who is requesting access Authorization What user is allowed to do Auditing What has user done Kerberos addresses all of these needs.

The authentication problem:

Authentication Three ways to prove identity Something you know Something you have Something you are Kerberos is ‘something you know’, but stronger. Fermilab computers that offer login or FTP services over the network cannot accept passwords for authentication. Increasin g Strength

What is Kerberos Good For? Verify identity of users and servers Encrypt communication if desired Centralized repository of accounts (Kerberos uses ‘realm’ to group accounts) Local authentication Enforce ‘good’ password policy Provide an audit trail of usage

How does Kerberos Work? (Briefly) A password is shared between the user and KDC Credentials are called tickets Credentials are saved in a cache Initial credential request is for a special ticket granting ticket (TGT)

Using Kerberos MS Windows Windows domain login 3rd party Kerberos tools WRQ Reflection MIT Kerberos for Windows (KfW) Leash32 Exceed Unix, Linux and Mac OS X

MS Windows Domain login Kerberos Ticket (Windows Kerbtray.exe application) Notice realm - FERMI.WIN.FNAL.GOV

MS Windows Managing Credentials MIT Kerberos for Windows (KfW) Notice realm - FNAL.GOV

MS Windows Managing Credentials WRQ Kerberos Manager

MS Windows Managing Credentials OpenAFS Token

UNIX, Linux, Mac OS X Kerberos tools: kinit klist kdestroy k5push Clients: telnet, ssh, ftp rlogin, rsh, rcp

Things to watch for: Cryptocard gothas. SSH end-to-end?

Cryptocard Gotchas Where is that ‘kinit’ command running? (Beware of remote connections.) Cryptocard doesn’t mean encryption. (Cryptocard authentication yields a Kerberos credential cache.)

SSH considerations Use cryptocard authentication yields an ecrypted connection. Need to be aware where the endpoints of the SSH connection are. (Beware of ‘stacked’ connections.) Local Host RemoteHostRemoteHost telnet ssh