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Refactor SASL code with a generic interface for its mechanisms

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The code of SCRAM and SASL have been tightly linked together since SCRAM
exists in the core code, making hard to apprehend the addition of new
SASL mechanisms, but these are by design different facilities, with
SCRAM being an option for SASL.  This refactors the code related to both
so as the backend and the frontend use a set of callbacks for SASL
mechanisms, documenting while on it what is expected by anybody adding a
new SASL mechanism.

The separation between both layers is neat, using two sets of callbacks
for the frontend and the backend to mark the frontier between both
facilities.  The shape of the callbacks is now directly inspired from
the routines used by SCRAM, so the code change is straight-forward, and
the SASL code is moved into its own set of files.  These will likely
change depending on how and if new SASL mechanisms get added in the
future.

Author: Jacob Champion
Reviewed-by: Michael Paquier
Discussion: https://postgr.es/m/3d2a6f5d50e741117d6baf83eb67ebf1a8a35a11.camel@vmware.com
This commit is contained in:
Michael Paquier
2021-07-07 10:55:15 +09:00
parent 955b3e0f92
commit 9fd85570d1
14 changed files with 552 additions and 222 deletions
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2
src/tools/pgindent/typedefs.list
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@ -3319,6 +3319,7 @@ pgParameterStatus
pg_atomic_flag
pg_atomic_uint32
pg_atomic_uint64
pg_be_sasl_mech
pg_checksum_context
pg_checksum_raw_context
pg_checksum_type
@ -3334,6 +3335,7 @@ pg_enc
pg_enc2gettext
pg_enc2name
pg_encname
pg_fe_sasl_mech
pg_funcptr_t
pg_gssinfo
pg_hmac_ctx