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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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6
scram/examples_test.go
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@ -30,12 +30,12 @@ func Example() {
// Make a new client for authenticating user mjl with SCRAM-SHA-256.
username := "mjl"
authz := ""
client := scram.NewClient(sha256.New, username, authz)
client := scram.NewClient(sha256.New, username, authz, false, nil)
clientFirst, err := client.ClientFirst()
check(err, "client.ClientFirst")
// Instantia a new server with the initial message from the client.
server, err := scram.NewServer(sha256.New, []byte(clientFirst))
// Instantiate a new server with the initial message from the client.
server, err := scram.NewServer(sha256.New, []byte(clientFirst), nil, false)
check(err, "NewServer")
// Generate first message from server to client, with a challenge.