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Cloudflare Tunnel client with NetBSD support
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2.3 kB · 87 lines
Go
at master
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import ( "fmt" "io")
// Authenticator is the connection passed in as a reader/writer to support different authentication typestype Authenticator interface { Handle(io.Reader, io.Writer) error}
// NoAuthAuthenticator is used to handle the No Authentication modetype NoAuthAuthenticator struct{}
// NewNoAuthAuthenticator creates a authless Authenticatorfunc NewNoAuthAuthenticator() Authenticator { return &NoAuthAuthenticator{}}
// Handle writes back the version and NoAuthfunc (a *NoAuthAuthenticator) Handle(reader io.Reader, writer io.Writer) error { _, err := writer.Write([]byte{socks5Version, NoAuth}) return err}
// UserPassAuthAuthenticator is used to handle the user/password modetype UserPassAuthAuthenticator struct { IsValid func(string, string) bool}
// NewUserPassAuthAuthenticator creates a new username/password validator Authenticatorfunc NewUserPassAuthAuthenticator(isValid func(string, string) bool) Authenticator { return &UserPassAuthAuthenticator{ IsValid: isValid, }}
// Handle writes back the version and NoAuthfunc (a *UserPassAuthAuthenticator) Handle(reader io.Reader, writer io.Writer) error { if _, err := writer.Write([]byte{socks5Version, UserPassAuth}); err != nil { return err }
// Get the version and username length header := []byte{0, 0} if _, err := io.ReadAtLeast(reader, header, 2); err != nil { return err }
// Ensure compatibility. Someone call E-harmony if header[0] != userAuthVersion { return fmt.Errorf("Unsupported auth version: %v", header[0]) }
// Get the user name userLen := int(header[1]) user := make([]byte, userLen) if _, err := io.ReadAtLeast(reader, user, userLen); err != nil { return err }
// Get the password length if _, err := reader.Read(header[:1]); err != nil { return err }
// Get the password passLen := int(header[0]) pass := make([]byte, passLen) if _, err := io.ReadAtLeast(reader, pass, passLen); err != nil { return err }
// Verify the password if a.IsValid(string(user), string(pass)) { _, err := writer.Write([]byte{userAuthVersion, authSuccess}) return err }
// password failed. Write back failure if _, err := writer.Write([]byte{userAuthVersion, authFailure}); err != nil { return err }
return fmt.Errorf("User authentication failed")}