Re: BUG #14130: SSL certifiate's Subject Alternative Name isn't check correctly

On 09/05/16 20:08, sergei.agalakov@getmyle.com wrote:
> CentOS 7, OpenSSL 1.0.2h, Postgres 9.5.2
> 1. Created server certificate signed by local CA with three Subject
> Alternative Name values
> $ openssl x509 -in server.crt -text -noout
> ...
> X509v3 Subject Alternative Name:
>                  DNS:myle-db001a-small.c.myle-gce-proj-01.internal, IP
> Address:162.222.177.29, IP Address:10.240.0.3
> ...
> 2. Created and copied root.crt for local CA certificate
> 3. Switched SSL mode to verify-full
> $export PGSSLMODE=verify-full
> 4. $psql -h 10.240.0.3 -U postgres
> psql: server certificate for "myle-db001a-small.c.myle-gce-proj-01.internal"
> does not match host name "10.240.0.3"
> According to E.3.3.1.4. SSL in
> http://www.postgresql.org/docs/9.5/static/release-9-5.html
> PG 9.5 should check all Subject Alternative Names to match in the
> certificate. The same implies in
> http://www.postgresql.org/docs/9.5/static/libpq-ssl.html
> "In verify-full mode, the host name is matched against the certificate's
> Subject Alternative Name attribute(s), or against the Common Name attribute
> if no Subject Alternative Name of type dNSName is present."
> An expected result was a SSL connection because one of SAN attributes
> matched host name. Instead a connection was refused.

PostgreSQL only pays attention to "DNS" SAN attributes, the IP addresses
are ignored. It would be a nice feature if it did, but that hasn't been
implemented.

- Heikki