mirror of
https://github.com/wneessen/go-mail.git
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Winni Neessen
5dbb1e6dde
This is a sync with the net/smtp upstream as committed here: 1d45a7ef56 (diff-4f6f6bdb9891d4dd271f9f31430420a2e44018fe4ee539576faf458bebb3cee4).
52 lines
1.7 KiB
Go
52 lines
1.7 KiB
Go
// SPDX-FileCopyrightText: Copyright 2010 The Go Authors. All rights reserved.
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// SPDX-FileCopyrightText: Copyright (c) 2022-2023 The go-mail Authors
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//
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// Original net/smtp code from the Go stdlib by the Go Authors.
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// Use of this source code is governed by a BSD-style
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// LICENSE file that can be found in this directory.
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//
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// go-mail specific modifications by the go-mail Authors.
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// Licensed under the MIT License.
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// See [PROJECT ROOT]/LICENSES directory for more information.
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//
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// SPDX-License-Identifier: BSD-3-Clause AND MIT
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//go:build !go1.19
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// +build !go1.19
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package smtp
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import (
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"crypto/hmac"
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"crypto/md5"
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"fmt"
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)
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// cramMD5Auth is the type that satisfies the Auth interface for the "SMTP CRAM_MD5" auth
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type cramMD5Auth struct {
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username, secret string
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}
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// CRAMMD5Auth returns an [Auth] that implements the CRAM-MD5 authentication
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// mechanism as defined in RFC 2195.
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// The returned Auth uses the given username and secret to authenticate
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// to the server using the challenge-response mechanism.
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func CRAMMD5Auth(username, secret string) Auth {
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return &cramMD5Auth{username, secret}
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}
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func (a *cramMD5Auth) Start(_ *ServerInfo) (string, []byte, error) {
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return "CRAM-MD5", nil, nil
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}
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// Backport of: https://github.com/golang/go/commit/58158e990f272774e615c9abd8662bf0198c29aa#diff-772fc9f5d0c86f26e35158fb3e7a71a4967d18b4ec23a5dbb60781ab0babf426
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// to guarantee backwards compatibility with Go 1.16-1.18
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func (a *cramMD5Auth) Next(fromServer []byte, more bool) ([]byte, error) {
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if more {
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d := hmac.New(md5.New, []byte(a.secret))
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d.Write(fromServer)
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s := make([]byte, 0, d.Size())
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return []byte(fmt.Sprintf("%s %x", a.username, d.Sum(s))), nil
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}
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return nil, nil
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}
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