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The initial k5test.py design, copied from the dejagnu suite, is to
create config files and environments for four expected roles: client,
server, master, and slave. This approach exaggerates the complexity
of the common case, where the configurations don't need to vary, and
limits us to having just one slave for kprop/iprop tests.
Instead, create just one configuration by default, and add a
special_env() method which sets up a differently configured
environment for the few test cases which need one. The run_as_*()
methods are collapsed into just run(), which accepts an optional
argument for the environment returned by special_env().
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Adds a principal string attribute named "session_enctypes" which can
specify what enctypes the principal supports for session keys. (For
what it's worth, this actually allows one to list des-cbc-md5 as a
supported session key enctype, though obviously this hardly matters
now.)
Add a [realms] section parameter for specifying whether to assume that
principals (which lack the session_enctypes attribute) support
des-cbc-crc for session keys. This allows those who still need to use
allow_weak_crypto=true, for whatever reason, to start reducing the
number of tickets issued with des-cbc-crc session keys to clients
which still give des-cbc-crc preference in their default_tgs_enctypes
list.
[ghudson@mit.edu: Miscellaneous edits, cleanups, and fixes; refactored
test script; documented session_enctypes attribute]
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