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implement the plus variants of scram, to bind the authentication exchange to the tls connection

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to get the security benefits (detecting mitm attempts), explicitly configure
clients to use a scram plus variant, e.g. scram-sha-256-plus. unfortunately,
not many clients support it yet.

imapserver scram plus support seems to work with the latest imtest (imap test
client) from cyrus-sasl. no success yet with mutt (with gsasl) though.
This commit is contained in:
Mechiel Lukkien
2023-12-23 23:07:21 +01:00
parent 4701857d7f
commit e7478ed6ac
23 changed files with 690 additions and 189 deletions
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2
config/config.go
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@ -260,7 +260,7 @@ type TransportSMTP struct {
type SMTPAuth struct {
Username string
Password string
Mechanisms []string `sconf:"optional" sconf-doc:"Allowed authentication mechanisms. Defaults to SCRAM-SHA-256, SCRAM-SHA-1, CRAM-MD5. Not included by default: PLAIN."`
Mechanisms []string `sconf:"optional" sconf-doc:"Allowed authentication mechanisms. Defaults to SCRAM-SHA-256-PLUS, SCRAM-SHA-256, SCRAM-SHA-1-PLUS, SCRAM-SHA-1, CRAM-MD5. Not included by default: PLAIN. Specify the strongest mechanism known to be implemented by the server to prevent mechanism downgrade attacks."`
EffectiveMechanisms []string `sconf:"-" json:"-"`
}