Linux-Postfix+Dovecot+Postfixadmin+Roundcubemail 搭建郵件服務器管理系統（四）

實現 SMTP 發信認證

1、 啓動 saslauthd 認證服務

[root@mail ~]# yum  -y  install  cyrus-sasl        //此包默認通常已安裝
[root@mail ~]# systemctl restart saslauthd 
[root@mail ~]# systemctl enable saslauthd
[root@mail ~]# testsaslauthd  -u user01  -p test1234  -s  smtp
0: OK "Success."                                    //檢查saslauthd服務

2、編輯 postfix 配置，啓用SMTP認證

[root@mail ~]# vim  /etc/postfix/main.cf
# 設置本地網絡
mynetworks = 127.0.0.1
# 啓用SASL認證
smtpd_sasl_auth_enable = yes
# 阻止匿名發信
smtpd_sasl_security_options = noanonymous
# 拒絕向未授權的目標域發信
smtpd_recipient_restrictions = permit_mynetworks,  permit_sasl_authenticated, reject_unauth_destination                       
[root@mail ~]# systemctl restart saslauthd 

3、以用戶user01爲例，未經過認證登錄時，向外域發郵件會被拒絕

[root@mail ~]# telnet mail.auto.com 25
Trying 127.0.0.1...
Connected to mail.auto.com (127.0.0.1).
Escape character is '^]'.
220 mail.xxx.com ESMTP Postfix
HELO localhost                                                    //  宣告本機地址
250 mail.auto.com
MAIL FROM:[email protected]                           // 指定發件人地址
250 2.1.0 Ok
RCPT TO:[email protected]                                   //  指定收件人地址
454 4.7.1 <[email protected]>: Relay access denied 
                                                                        //  發送外域的發信請求被拒絕
quit                                                                //  斷開telnet連接
221 2.0.0 Bye
Connection closed by foreign host.

• 爲用戶user01爲例，生成用戶名、密碼的加密字串

[root@mail ~]# printf  "user01" | openssl  base64
bmljaw==
[root@mail ~]# printf  "test1234" | openssl  base64
MTIzNDU2Nw==

• 認證登錄通過以後，才允許向外域發郵件

[root@mail ~]# telnet mail.auto.com 25

Trying 127.0.0.1...
Connected to mail.xxx.com (127.0.0.1).
Escape character is '^]'.
220 mail.xxx.com ESMTP Postfix
EHLO localhost                              //加密宣告本機地址
250-mail.xxx.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-AUTH PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
AUTH LOGIN                                 //聲明要執行認證登錄
334 VXNlcm5hbWU6
bmljaw==                                   //輸入用戶名xxx的BASE64編碼
334 UGFzc3dvcmQ6
MTIzNDU2Nw==                               //輸入密碼1234567的BASE64編碼
235 2.7.0 Authentication successful
MAIL FROM:[email protected]                    //指定發件人地址
250 2.1.0 Ok
RCPT TO:[email protected]                   //指定收件人地址
250 2.1.5 Ok
DATA                                       //開始編寫郵件內容
354 End data with <CR><LF>.<CR><LF>
Subject:SMTP Auth Test                     //指定郵件標題
  Hello, here is a test mail.              //輸入文本郵件內容
.                                          //獨立的 . 表示輸入完畢
250 2.0.0 Ok: queued as 8C48431D8B2
quit                                       //斷開telnet連接
221 2.0.0 Bye
Connection closed by foreign host.