Add support for hashing time.Time within slices, which unbreaks auditing of requests returning the request counters.
Break Hash into struct-specific func like HashAuth, HashRequest. Move all the copying/hashing logic from FormatRequest/FormatResponse into the new Hash* funcs. HashStructure now modifies in place instead of copying.
Instead of returning an error when trying to hash map keys of type time.Time, ignore them, i.e. pass them through unhashed.
Enable auditing on test clusters by default if the caller didn't specify any audit backends. If they do, they're responsible for setting it up.
This enables audit.Hash to hash time.Time values that may exist as
direct fields in the map. This will error (instead of panic) for any
time.Time values that don't occur within map values. For example, this
does not support a time.Time within a slice. If that needs to be
supported then modifications will need to be made.
This also requires an update to reflectwalk (included in this PR). This
is a minimal change that allows SkipEntry to signal to skip an entire
struct. We do this because we don't want to walk any of time.Time since
we handle it directly.
with a new endpoint '/sys/audit-hash', which returns the given input
string hashed with the given audit backend's hash function and salt
(currently, always HMAC-SHA256 and a backend-specific salt).
In the process of adding the HTTP handler, this also removes the custom
HTTP handlers for the other audit endpoints, which were simply
forwarding to the logical system backend. This means that the various
audit functions will now redirect correctly from a standby to master.
(Tests all pass.)
Fixes#784
