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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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21
imapclient/cmds.go
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@ -61,13 +61,26 @@ func (c *Conn) AuthenticatePlain(username, password string) (untagged []Untagged
return
}
// Authenticate with SCRAM-SHA-1 or SCRAM-SHA-256, where the password is not
// exchanged in original plaintext form, but only derived hashes are exchanged by
// both parties as proof of knowledge of password.
// Authenticate with SCRAM-SHA-256(-PLUS) or SCRAM-SHA-1(-PLUS). With SCRAM, the
// password is not exchanged in plaintext form, but only derived hashes are
// exchanged by both parties as proof of knowledge of password.
//
// The PLUS variants bind the authentication exchange to the TLS connection,
// detecting MitM attacks.
func (c *Conn) AuthenticateSCRAM(method string, h func() hash.Hash, username, password string) (untagged []Untagged, result Result, rerr error) {
defer c.recover(&rerr)
sc := scram.NewClient(h, username, "")
var cs *tls.ConnectionState
lmethod := strings.ToLower(method)
if strings.HasSuffix(lmethod, "-plus") {
tlsConn, ok := c.conn.(*tls.Conn)
if !ok {
c.xerrorf("cannot use scram plus without tls")
}
xcs := tlsConn.ConnectionState()
cs = &xcs
}
sc := scram.NewClient(h, username, "", false, cs)
clientFirst, err := sc.ClientFirst()
c.xcheckf(err, "scram clientFirst")
c.LastTag = c.nextTag()