51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
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// Copyright 2018 by David A. Golden. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package scram
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import "sync"
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// Server implements the server side of SCRAM authentication. It holds
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// configuration values needed to initialize new server-side conversations.
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// Generally, this can be persistent within an application.
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type Server struct {
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sync.RWMutex
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credentialCB CredentialLookup
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nonceGen NonceGeneratorFcn
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hashGen HashGeneratorFcn
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}
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func newServer(cl CredentialLookup, fcn HashGeneratorFcn) (*Server, error) {
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return &Server{
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credentialCB: cl,
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nonceGen: defaultNonceGenerator,
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hashGen: fcn,
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}, nil
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}
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// WithNonceGenerator replaces the default nonce generator (base64 encoding of
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// 24 bytes from crypto/rand) with a custom generator. This is provided for
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// testing or for users with custom nonce requirements.
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func (s *Server) WithNonceGenerator(ng NonceGeneratorFcn) *Server {
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s.Lock()
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defer s.Unlock()
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s.nonceGen = ng
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return s
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}
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// NewConversation constructs a server-side authentication conversation.
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// Conversations cannot be reused, so this must be called for each new
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// authentication attempt.
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func (s *Server) NewConversation() *ServerConversation {
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s.RLock()
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defer s.RUnlock()
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return &ServerConversation{
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nonceGen: s.nonceGen,
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hashGen: s.hashGen,
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credentialCB: s.credentialCB,
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}
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}
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