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

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

View File

@ -130,7 +130,9 @@ Subject: test message
This is the message.
`, mailfrom, rcptto)
msg = strings.ReplaceAll(msg, "\n", "\r\n")
auth := []sasl.Client{sasl.NewClientPlain(mailfrom, password)}
auth := func(mechanisms []string, cs *tls.ConnectionState) (sasl.Client, error) {
return sasl.NewClientPlain(mailfrom, password), nil
}
c, err := smtpclient.New(mox.Context, log.Logger, conn, smtpclient.TLSSkip, false, ourHostname, dns.Domain{ASCII: desthost}, smtpclient.Opts{Auth: auth})
tcheck(t, err, "smtp hello")
err = c.Deliver(mox.Context, mailfrom, rcptto, int64(len(msg)), strings.NewReader(msg), false, false, false)