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8.2 Kerberos Authentication

If rlogin was compiled with kerberos support, optins -x, -k, -K are available. Each user may have a private authorization list in the file .klogin in their home directory. Each line in this file should contain a Kerberos principal name of the form principal.instance@realm. If the originating user is authenticated to one of the principals named in .klogin, access is granted to the account. The principal accountname.@localrealm is granted access if there is no .klogin file. Otherwise a login and password will be prompted for on the remote machine as in login(1). To avoid certain security problems, the .klogin file must be owned by the remote user. If Kerberos authentication fails, a warning message is printed and the standard Berkeley rlogin is used instead.

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