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I am using gpg-agent 2.0.17 with gpg 1.4.11 on ubuntu 12.04 and the Enigmail Addon for Thunderbird. When opening an encrypted email, Enigmail invokes gpg-agent with the associated pinentry program and asks for the password. I then have the option to set the lifetime for the cached password, usually set to end of the session.

Since I rarely shutdown or logout of my session, I would like to force gpg-agent to forget all cached passwords upon locking the session. I've searched for a way to do so and the man-page of gpg-agent states, that a -SIGHUP will flush all passwords - however, contrary to the manpage, the cached passwords are not forgotten.

Any ideas on how to force gpg-agent to forget the passwords?

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1 Answer 1

TTL for cache passwords is controlled by gpg-agent's options:

--default-cache-ttl n
  Set the time a cache entry is valid to n seconds.  The default is 600 seconds.
--max-cache-ttl n
  Set  the  maximum time a cache entry is valid to n seconds.  After this time a cache entry will be expired even if it has been accessed recently.  The default is 2 hours (7200 seconds).

As per a way to control this on-demand, if you are able to trigger a command upon locking your screen, using keychain to handle gpg-agent could be used to execute

keychain --clear --agents gpg

which would kill all managed instances of gpg-agent. But then, you should have a way to execute keychain --agents gpg --eval $gpg upon unlocking your screen. Maybe too much hassle.

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Thanks for your answer - I might use this, if I do not find another solution to kill the cache. –  Lars Jun 15 '13 at 18:42
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