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Harden default challenge code storage and name lookups - #64
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Require the user name to be a single path element, create the challenge code file exclusively, and only read it back when it is a regular file owned by the current user. Encode the name query parameter in GetUserByName and GetGroupByName.
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Summary
Harden the default challenge code store and name lookups.
Changes
DefaultStoreChallengeCode/DefaultPopChallengeCodeGetUserByName/GetGroupByName: encode thenamequery parameter