Can you add support to have a real security?

Thanks in advance.

Note, after SCRAM-SHA-1(-PLUS):

• GNU SASL (gsasl) supports SCRAM-SHA-256(-PLUS) since 1.9.1: http://git.savannah.gnu.org/gitweb/?p=gsasl.git;a=blob;f=NEWS;hb=HEAD
• Dovecot supports SCRAM-SHA-256(-PLUS) since 2.3.10: https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/
• Cyrus SASL/IMAP supports SCRAM-SHA-256(-PLUS) and more since 2.1.27: https://www.cyrusimap.org/sasl/sasl/authentication_mechanisms.html
• ...
• More detailled list here: https://github.com/scram-xmpp/info/issues/1

"When using the SASL SCRAM mechanism, the SCRAM-SHA-256-PLUS variant SHOULD be preferred over the SCRAM-SHA-256 variant, and SHA-256 variants [RFC7677] SHOULD be preferred over SHA-1 variants [RFC5802]".

• SCRAM-SHA-1(-PLUS):
  • https://tools.ietf.org/html/rfc5802
  • https://tools.ietf.org/html/rfc6120

• SCRAM-SHA-256(-PLUS):
  • https://tools.ietf.org/html/rfc7677 since 2015-11-02
  • https://tools.ietf.org/html/rfc8600 since 2019-06-21: https://mailarchive.ietf.org/arch/msg/ietf-announce/suJMmeMhuAOmGn_PJYgX5Vm8lNA

• SCRAM-SHA-512(-PLUS):
  • https://tools.ietf.org/html/draft-melnikov-scram-sha-512

• SCRAM-SHA3-512(-PLUS):
  • https://tools.ietf.org/html/draft-melnikov-scram-sha3-512

https://xmpp.org/extensions/inbox/hash-recommendations.html

-PLUS variants:

• RFC5056: On the Use of Channel Bindings to Secure Channels: https://tools.ietf.org/html/rfc5056
• RFC5929: Channel Bindings for TLS: https://tools.ietf.org/html/rfc5929
• Channel-Binding Types: https://www.iana.org/assignments/channel-binding-types/channel-binding-types.xhtml
• Channel Bindings for SCRAM over TLS 1.3: https://tools.ietf.org/html/draft-whited-tls-channel-bindings-for-tls13 -> https://tools.ietf.org/html/draft-ietf-kitten-tls-channel-bindings-for-tls13

IMAP:

• RFC9051: Internet Message Access Protocol (IMAP) - Version 4rev2: https://tools.ietf.org/html/rfc9051

LDAP:

• RFC5803: Lightweight Directory Access Protocol (LDAP) Schema for Storing Salted: Challenge Response Authentication Mechanism (SCRAM) Secrets: https://tools.ietf.org/html/rfc5803

HTTP:

• RFC7804: Salted Challenge Response HTTP Authentication Mechanism: https://tools.ietf.org/html/rfc7804

2FA:

• Extensions to Salted Challenge Response (SCRAM) for 2 factor authentication: https://tools.ietf.org/html/draft-melnikov-scram-2fa

IANA:

• Simple Authentication and Security Layer (SASL) Mechanisms: https://www.iana.org/assignments/sasl-mechanisms/sasl-mechanisms.xhtml

Linked to:

• https://github.com/scram-xmpp/info/issues/1
• https://github.com/roundcube/roundcubemail/issues/6917