Horton

Re: [Proposal] Table-level Transparent Data Encryption (TDE) and Key Management Service (KMS)

Antonin Houska <ah@cybertec.at>

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From: Antonin Houska <ah@cybertec.at>
To: Masahiko Sawada <sawada.mshk@gmail.com>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>, Stephen Frost <sfrost@snowman.net>, Joe Conway <mail@joeconway.com>, Bruce Momjian <bruce@momjian.us>, Robert Haas <robertmhaas@gmail.com>, Haribabu Kommi <kommi.haribabu@gmail.com>, "Moon, Insung" <Moon_Insung_i3@lab.ntt.co.jp>, Ibrar Ahmed <ibrar.ahmad@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2019-06-17T13:25:12Z
Lists: pgsql-hackers

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  1. Revamp the WAL record format.

Masahiko Sawada <sawada.mshk@gmail.com> wrote:

> The cluster-wide TDE eventually encrypts SLRU data and all WAL
> including non-user data related WAL while table/tablespace TDE doesn't
> unless we develop such functionality. In addition, the cluster-wide
> TDE also encrypts system catalogs but in table/tablespace TDE user
> would be able to control that somewhat. That is, if we developed the
> cluster-wide TDE first, when we develop table/tablespace TDE on top of
> that we would need to change TDE so that table/tablespace TDE can
> encrypt even non-user data related data while retaining its simple
> user interface, which would rather make the feature complex, I'm
> concerned.

Isn't this only a problem of pg_upgrade? If the whole instance (including
catalog) is encrypted and user wants to adopt the table/tablespace TDE, then
pg_upgrade can simply decrypt the catalog, plus tables/tablespaces which
should no longer be encrypted. Conversely, if only some tables/tablespaces are
encrypted and user wants to encrypt the whole cluster, pg_upgrade will encrypt
the non-encrypted files.

> We can support them as different TDE features but I'm not sure it's a good
> choice for users.

IMO it does not matter which approach (cluster vs table/tablespace) is
implemented first. What matters is to design the user interface so that
addition of the other of the two features does not make users confused.

-- 
Antonin Houska
Web: https://www.cybertec-postgresql.com