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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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40
smtpserver/server_test.go
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@ -89,7 +89,7 @@ type testserver struct {
comm *store.Comm
cid int64
resolver dns.Resolver
auth []sasl.Client
auth func(mechanisms []string, cs *tls.ConnectionState) (sasl.Client, error)
user, pass string
submission bool
requiretls bool
@ -159,11 +159,11 @@ func (ts *testserver) run(fn func(helloErr error, client *smtpclient.Client)) {
close(serverdone)
}()
var auth []sasl.Client
if len(ts.auth) > 0 {
auth = ts.auth
} else if ts.user != "" {
auth = append(auth, sasl.NewClientPlain(ts.user, ts.pass))
auth := ts.auth
if auth == nil && ts.user != "" {
auth = func(mechanisms []string, cs *tls.ConnectionState) (sasl.Client, error) {
return sasl.NewClientPlain(ts.user, ts.pass), nil
}
}
ourHostname := mox.Conf.Static.HostnameDomain
@ -234,10 +234,12 @@ func TestSubmission(t *testing.T) {
}
mox.Conf.Dynamic.Domains["mox.example"] = dom
testAuth := func(authfn func(user, pass string) sasl.Client, user, pass string, expErr *smtpclient.Error) {
testAuth := func(authfn func(user, pass string, cs *tls.ConnectionState) sasl.Client, user, pass string, expErr *smtpclient.Error) {
t.Helper()
if authfn != nil {
ts.auth = []sasl.Client{authfn(user, pass)}
ts.auth = func(mechanisms []string, cs *tls.ConnectionState) (sasl.Client, error) {
return authfn(user, pass, cs), nil
}
} else {
ts.auth = nil
}
@ -258,12 +260,22 @@ func TestSubmission(t *testing.T) {
ts.submission = true
testAuth(nil, "", "", &smtpclient.Error{Permanent: true, Code: smtp.C530SecurityRequired, Secode: smtp.SePol7Other0})
authfns := []func(user, pass string) sasl.Client{
sasl.NewClientPlain,
sasl.NewClientLogin,
sasl.NewClientCRAMMD5,
sasl.NewClientSCRAMSHA1,
sasl.NewClientSCRAMSHA256,
authfns := []func(user, pass string, cs *tls.ConnectionState) sasl.Client{
func(user, pass string, cs *tls.ConnectionState) sasl.Client { return sasl.NewClientPlain(user, pass) },
func(user, pass string, cs *tls.ConnectionState) sasl.Client { return sasl.NewClientLogin(user, pass) },
func(user, pass string, cs *tls.ConnectionState) sasl.Client { return sasl.NewClientCRAMMD5(user, pass) },
func(user, pass string, cs *tls.ConnectionState) sasl.Client {
return sasl.NewClientSCRAMSHA1(user, pass, false)
},
func(user, pass string, cs *tls.ConnectionState) sasl.Client {
return sasl.NewClientSCRAMSHA256(user, pass, false)
},
func(user, pass string, cs *tls.ConnectionState) sasl.Client {
return sasl.NewClientSCRAMSHA1PLUS(user, pass, *cs)
},
func(user, pass string, cs *tls.ConnectionState) sasl.Client {
return sasl.NewClientSCRAMSHA256PLUS(user, pass, *cs)
},
}
for _, fn := range authfns {
testAuth(fn, "mjl@mox.example", "test", &smtpclient.Error{Secode: smtp.SePol7AuthBadCreds8}) // Bad (short) password.