[16088] in Kerberos-V5-bugs

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[krbdev.mit.edu #8718] krb5_get_credentials incorrectly matches user

daemon@ATHENA.MIT.EDU (Todd Lubin via RT)
Wed Aug 1 09:59:58 2018

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From: "Todd Lubin via RT" <rt-comment@KRBDEV-PROD-APP-1.mit.edu>
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Date: Wed,  1 Aug 2018 09:59:44 -0400 (EDT)
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It seems like there is no way to instruct krb5_get_credentials not to use a
cached user-to-user ticket for a particular service principal.

When you pass in KRB5_GC_USER_USER, there is care taken to ensure only a
user-to-user ticket is selected. However, the lack of that flag doesn't
prevent a user-to-user ticket from being selected from the cache.

It seems like either:
1) the lack of KRB5_GC_USER_USER should only match standard tickets
2) there should be some other flag introduced to express this desire

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