Re: Misconfiguration on SSL for download.postgresql.org ?

I think this had better go to the pgsql-www list.

Yours,
Laurenz Albe

On Thu, 2023-11-23 at 09:21 +0100, Frank Büttner wrote:
> since some day's all our servers can't download updates for the RPM
> packages of PostgreSQL.
>
> Error:
> Errors during downloading metadata for repository 'pgdg-common':
> - Curl error (35): SSL connect error for
> https://download.postgresql.org/pub/repos/yum/common/redhat/rhel-9-x86_64/repodata/repomd.xml
> [error:0A000410:SSL routines::sslv3 alert handshake failure]
> Fehler: Failed to download metadata for repo 'pgdg-common': Cannot
> download repomd.xml: Cannot download repodata/repomd.xml: All mirrors
> were tried
>
> After checking the site via nmap:
> nmap -p 443 download.postgresql.org --script ssl-enum-ciphers
> > TLSv1.3:
> > ciphers:
> > TLS_AKE_WITH_AES_256_GCM_SHA384 (secp384r1) - A
> > TLS_AKE_WITH_CHACHA20_POLY1305_SHA256 (secp384r1) - A
> > TLS_AKE_WITH_AES_128_GCM_SHA256 (secp384r1) - A
>
>
> I found the problem, the "x25519" ciphers are missing.
> > TLSv1.3:
> > ciphers:
> > TLS_AKE_WITH_AES_256_GCM_SHA384 (ecdh_x25519) - A
> > TLS_AKE_WITH_CHACHA20_POLY1305_SHA256 (ecdh_x25519) - A
>
>
> Which are need on systems where the NIST curves are blocked for security
> reasons.
>
>
> So please re enable the x25519 curve.