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PostgreSQL must map the PKI-authenticated identity to an associated user account.


Finding ID Version Rule ID IA Controls Severity
V-233615 CD12-00-011800 SV-233615r607070_rule Medium
The DoD standard for authentication is DoD-approved PKI certificates. Once a PKI certificate has been validated, it must be mapped to PostgreSQL user account for the authenticated identity to be meaningful to PostgreSQL and useful for authorization decisions.
Crunchy Data PostgreSQL Security Technical Implementation Guide 2022-06-13


Check Text ( C-36809r607068_chk )
The Common Name (cn) attribute of the certificate will be compared to the requested database user name and, if they match, the login will be allowed.

To check the cn of the certificate, using openssl, do the following:

$ openssl x509 -noout -subject -in client_cert

If the cn does not match the users listed in PostgreSQL and no user mapping is used, this is a finding.

User name mapping can be used to allow cn to be different from the database user name. If User Name Maps are used, run the following as the database administrator (shown here as "postgres"), to get a list of maps used for authentication:

$ sudo su - postgres
$ grep "map" ${PGDATA?}/pg_hba.conf

With the names of the maps used, check those maps against the user name mappings in pg_ident.conf:

$ sudo su - postgres
$ cat ${PGDATA?}/pg_ident.conf

If user accounts are not being mapped to authenticated identities, this is a finding.

If the cn and the username mapping do not match, this is a finding.
Fix Text (F-36774r607069_fix)
Configure PostgreSQL to map authenticated identities directly to PostgreSQL user accounts.

For information on configuring PostgreSQL to use SSL, see supplementary content APPENDIX-G.