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Add support for Kerberos credential delegation

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Support GSSAPI/Kerberos credentials being delegated to the server by a
client.  With this, a user authenticating to PostgreSQL using Kerberos
(GSSAPI) credentials can choose to delegate their credentials to the
PostgreSQL server (which can choose to accept them, or not), allowing
the server to then use those delegated credentials to connect to
another service, such as with postgres_fdw or dblink or theoretically
any other service which is able to be authenticated using Kerberos.

Both postgres_fdw and dblink are changed to allow non-superuser
password-less connections but only when GSSAPI credentials have been
delegated to the server by the client and GSSAPI is used to
authenticate to the remote system.

Authors: Stephen Frost, Peifeng Qiu
Reviewed-By: David Christensen
Discussion: https://postgr.es/m/CO1PR05MB8023CC2CB575E0FAAD7DF4F8A8E29@CO1PR05MB8023.namprd05.prod.outlook.com
This commit is contained in:
Stephen Frost
2023-04-07 21:58:04 -04:00
parent edc627ae27
commit 3d4fa227bc
36 changed files with 761 additions and 142 deletions
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3
contrib/postgres_fdw/sql/postgres_fdw.sql
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@ -185,7 +185,8 @@ ALTER SERVER testserver1 OPTIONS (
sslcrl 'value',
--requirepeer 'value',
krbsrvname 'value',
gsslib 'value'
gsslib 'value',
gssdeleg 'value'
--replication 'value'
);