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I have two servers, on both I need to authenticate with kerberos. If I don't have a valid kerberos ticket, I cannot login on server A. On Server B, I can login without a kerberos ticket, it will prompt for my password and create a kerberos ticket during login.

On server A I can start a tmux session and it can run forever, without me ever running into any problems.

When running a tmux session on server B, as soon as I log out from the server, I lose permission to access my files. I tried using k5reauth, but it does not seem to work.

How can I run a tmux session on server B, without losing my kerberos ticket?

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Logging out destroys your ticket . you need to somehow:

  1. Find it
  2. Copy it
  3. point your kerberos libs to it
  4. keep renewing it (optional).

For 1 klist will help : first line says ticket cache: 2 depends on 1, if it is FILE:/tmp/krb5_XXXXXXX of DIR:/SOME/PATH all you have to do is copy it:

cp /tmp/krb5_XXXXXXX /tmp/krb5_tmux_XXXXXXX)

Make sure that only you can read it.

For 3 set env var KRB5CCNAME to FILE:/tmp/krb5_tmux_XXXXXXX:

export KRB5CCNAME=FILE:/tmp/krb5_tmux_XXXXXXX

step 4 can be achieved with krenew from the kstart package (look it up)

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