(heimdal.info) Cross realm

 
 Cross realm
 ===========
 
 Suppose you are residing in the realm `MY.REALM', how do you
 authenticate to a server in `OTHER.REALM'? Having valid tickets in
 `MY.REALM' allows you to communicate with kerberised services in that
 realm. However, the computer in the other realm does not have a secret
 key shared with the Kerberos server in your realm.
 
 It is possible to add a share keys between two realms that trust each
 other. When a client program, such as `telnet' or `ssh', finds that the
 other computer is in a different realm, it will try to get a ticket
 granting ticket for that other realm, but from the local Kerberos
 server. With that ticket granting ticket, it will then obtain service
 tickets from the Kerberos server in the other realm.
 
 For a two way trust between `MY.REALM' and `OTHER.REALM' add the
 following principals to each realm. The principals should be
 `krbtgt/OTHER.REALM@MY.REALM' and `krbtgt/MY.REALM@OTHER.REALM' in
 `MY.REALM', and `krbtgt/MY.REALM@OTHER.REALM' and
 `krbtgt/OTHER.REALM@MY.REALM'in `OTHER.REALM'.
 
 In Kerberos 5 the trust can be one configured to be one way. So that
 users from `MY.REALM' can authenticate to services in `OTHER.REALM',
 but not the opposite. In the example above, the
 `krbtgt/MY.REALM@OTHER.REALM' then should be removed.
 
 The two principals must have the same key, key version number, and the
 same set of encryption types. Remember to transfer the two keys in a
 safe manner.
 
      vr$ klist
      Credentials cache: FILE:/tmp/krb5cc_913.console
              Principal: lha@E.KTH.SE
      
        Issued           Expires          Principal
      May  3 13:55:52  May  3 23:55:54  krbtgt/E.KTH.SE@E.KTH.SE
      
      vr$ telnet -l lha hummel.it.su.se
      Trying 2001:6b0:5:1095:250:fcff:fe24:dbf...
      Connected to hummel.it.su.se.
      Escape character is '^]'.
      Waiting for encryption to be negotiated...
      [ Trying mutual KERBEROS5 (host/hummel.it.su.se@SU.SE)... ]
      [ Kerberos V5 accepts you as ``lha@E.KTH.SE'' ]
      Encryption negotiated.
      Last login: Sat May  3 14:11:47 from vr.l.nxs.se
      hummel$ exit
      
      vr$ klist
      Credentials cache: FILE:/tmp/krb5cc_913.console
              Principal: lha@E.KTH.SE
      
        Issued           Expires          Principal
      May  3 13:55:52  May  3 23:55:54  krbtgt/E.KTH.SE@E.KTH.SE
      May  3 13:55:56  May  3 23:55:54  krbtgt/SU.SE@E.KTH.SE
      May  3 14:10:54  May  3 23:55:54  host/hummel.it.su.se@SU.SE
Info Catalog
(heimdal.info) Salting
(heimdal.info) Setting up a realm
(heimdal.info) Transit policy
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