Viktor Dukhovni 49861eb2c5 Delay KRB5_KTNAME lookup until keytab resolution. ...

Previously getenv("KRB5_KTNAME") happened in

    init_context_from_config_file()

which would capture the environment value as an override without
using strdup() to get a private copy, so it would get trashed in
applications that dynamically update the environment (e.g. Perl
code that has a tied %ENV).

The patch delays getenv("KRB5_KTNAME") until the context's value
of default_keytab is actually needed, and the environment can preempt
the context's default at that time.

[ Do we need to worry about issuid() being true initially when the
  context is created, but not later, because the application changes
  both the real and effective uid?  If so the issuid() state should
  be saved when the context is created and the saved value queried. ]

2015-02-06 23:17:50 -05:00

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