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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
imapserver/authenticate_test.go
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@ -60,22 +60,31 @@ func TestAuthenticatePlain(t *testing.T) {
}
func TestAuthenticateSCRAMSHA1(t *testing.T) {
testAuthenticateSCRAM(t, "SCRAM-SHA-1", sha1.New)
testAuthenticateSCRAM(t, false, "SCRAM-SHA-1", sha1.New)
}
func TestAuthenticateSCRAMSHA256(t *testing.T) {
testAuthenticateSCRAM(t, "SCRAM-SHA-256", sha256.New)
testAuthenticateSCRAM(t, false, "SCRAM-SHA-256", sha256.New)
}
func testAuthenticateSCRAM(t *testing.T, method string, h func() hash.Hash) {
tc := start(t)
func TestAuthenticateSCRAMSHA1PLUS(t *testing.T) {
testAuthenticateSCRAM(t, true, "SCRAM-SHA-1-PLUS", sha1.New)
}
func TestAuthenticateSCRAMSHA256PLUS(t *testing.T) {
testAuthenticateSCRAM(t, true, "SCRAM-SHA-256-PLUS", sha256.New)
}
func testAuthenticateSCRAM(t *testing.T, tls bool, method string, h func() hash.Hash) {
tc := startArgs(t, true, tls, true, true, "mjl")
tc.client.AuthenticateSCRAM(method, h, "mjl@mox.example", "testtest")
tc.close()
auth := func(status string, serverFinalError error, username, password string) {
t.Helper()
sc := scram.NewClient(h, username, "")
noServerPlus := false
sc := scram.NewClient(h, username, "", noServerPlus, tc.client.TLSConnectionState())
clientFirst, err := sc.ClientFirst()
tc.check(err, "scram clientFirst")
tc.client.LastTag = "x001"
@ -116,7 +125,7 @@ func testAuthenticateSCRAM(t *testing.T, method string, h func() hash.Hash) {
}
}
tc = start(t)
tc = startArgs(t, true, tls, true, true, "mjl")
auth("no", scram.ErrInvalidProof, "mjl@mox.example", "badpass")
auth("no", scram.ErrInvalidProof, "mjl@mox.example", "")
// todo: server aborts due to invalid username. we should probably make client continue with fake determinisitically generated salt and result in error in the end.