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Support lowercase username and password challenge #282

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merged 1 commit into from
Aug 16, 2024
Merged

Support lowercase username and password challenge #282

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10 changes: 6 additions & 4 deletions smtp/auth_login.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,13 +20,15 @@ const (
// extension.
//
// See: https://learn.microsoft.com/en-us/openspecs/exchange_server_protocols/ms-xlogin/.
LoginXUsernameChallenge = "Username:"
LoginXUsernameChallenge = "Username:"
LoginXUsernameLowerChallenge = "username:"

// LoginXPasswordChallenge represents the Password Challenge response sent by the SMTP server per the AUTH LOGIN
// extension.
//
// See: https://learn.microsoft.com/en-us/openspecs/exchange_server_protocols/ms-xlogin/.
LoginXPasswordChallenge = "Password:"
LoginXPasswordChallenge = "Password:"
LoginXPasswordLowerChallenge = "password:"

// LoginXDraftUsernameChallenge represents the Username Challenge response sent by the SMTP server per the IETF
// draft AUTH LOGIN extension. It should be noted this extension is an expired draft which was never formally
Expand Down Expand Up @@ -76,9 +78,9 @@ func (a *loginAuth) Start(server *ServerInfo) (string, []byte, error) {
func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
if more {
switch string(fromServer) {
case LoginXUsernameChallenge, LoginXDraftUsernameChallenge:
case LoginXUsernameChallenge, LoginXUsernameLowerChallenge, LoginXDraftUsernameChallenge:
return []byte(a.username), nil
case LoginXPasswordChallenge, LoginXDraftPasswordChallenge:
case LoginXPasswordChallenge, LoginXPasswordLowerChallenge, LoginXDraftPasswordChallenge:
return []byte(a.password), nil
default:
return nil, fmt.Errorf("unexpected server response: %s", string(fromServer))
Expand Down
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