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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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4
mox-/config.go
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@ -881,7 +881,9 @@ func PrepareStaticConfig(ctx context.Context, log mlog.Log, configFile string, c
}
seen[m] = true
switch m {
case "SCRAM-SHA-256-PLUS":
case "SCRAM-SHA-256":
case "SCRAM-SHA-1-PLUS":
case "SCRAM-SHA-1":
case "CRAM-MD5":
case "PLAIN":
@ -892,7 +894,7 @@ func PrepareStaticConfig(ctx context.Context, log mlog.Log, configFile string, c
t.Auth.EffectiveMechanisms = t.Auth.Mechanisms
if len(t.Auth.EffectiveMechanisms) == 0 {
t.Auth.EffectiveMechanisms = []string{"SCRAM-SHA-256", "SCRAM-SHA-1", "CRAM-MD5"}
t.Auth.EffectiveMechanisms = []string{"SCRAM-SHA-256-PLUS", "SCRAM-SHA-256", "SCRAM-SHA-1-PLUS", "SCRAM-SHA-1", "CRAM-MD5"}
}
}