在上篇文章centos7搭建postfix邮件服务器的搭建中我们没有配置SSL，接下来我们在这篇文章中讲讲centos7邮件服务器SSL配置。
1. 创建SSL证书
[root@www ~]# cd /etc/pki/tls/certs [root@www certs]# make server.key umask 77 ; \ /usr/bin/openssl genrsa -aes128 2048 > server.key Generating RSA private key, 2048 bit long modulus ......................................................++++++ .............++++++ e is 61251 (0x10001) Enter pass phrase:# set passphrase Verifying - Enter pass phrase:# confirm # remove passphrase from private key [root@www certs]# openssl rsa -in server.key -out server.key Enter pass phrase for server.key:# input passphrase writing RSA key [root@www certs]# [root@www certs]# make server.csr umask 77 ; \ /usr/bin/openssl req -utf8 -new -key server.key -out server.csr You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [XX]:JP # country State or Province Name (full name) [e]:Hiroshima # state Locality Name (eg, city) [Default City]:Hiroshima # city Organization Name (eg, company) [Default Company Ltd]:GTS # company Organizational Unit Name (eg, section) []:Server World # department Common Name (eg, your server's hostname) []:www.srv.world
# server's FQDN
Email Address []:xxx@srv.world # email address Please enter the following 'extra' attributes to be sent with your certificate request A challenge password []:# Enter An optional company name []:# Enter [root@www certs]# [root@www certs]# openssl x509 -in server.csr -out server.crt -req -signkey server.key -days 3650 Signature ok subject=/C=JP/ST=Hiroshima/L=Hiroshima/O=GTS/OU=Server World/CN=www.srv.world/emailAddress=xxx@srv.world Getting Private key [root@www certs]# chmod 400 server.*
2.配置Postfix和Dovecot
[root@mail ~]# vim /etc/postfix/main.cf # 添加到最后 smtpd_use_tls = yes smtpd_tls_cert_file = /etc/pki/tls/certs/server.crt smtpd_tls_key_file = /etc/pki/tls/certs/server.key smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_tls_loglevel = 0 smtpd_tls_auth_only = yes [root@mail ~]# vim /etc/postfix/master.cf # 17-18行: 取消注释 smtps inet n - n - - smtpd -o smtpd_tls_wrappermode=yes [root@mail ~]# vim /etc/dovecot/conf.d/10-ssl.conf # 6行: 取消注释 ssl = yes # 12,13行: 指定证书 ssl_cert = </etc/pki/tls/certs/server.crt ssl_key = </etc/pki/tls/certs/server.key
#开放SSL端口(端口的话，SMTP使用的是465, POP3使用995, IMAP使用993)
firewall-cmd --add-port={465/tcp,995/tcp,993/tcp} --permanent
firewall-cmd --reload # 重启postfix [root@mail ~]# systemctl restart postfix Shutting down postfix: [ OK ] Starting postfix: [ OK ] # 重启dovecot [root@mail ~]# systemctl restart dovecot Stopping Dovecot Imap: [ OK ] Starting Dovecot Imap: [ OK ]
3. 使用SSL登录
配置好了以后，我们在使用Foxmail等客户端的时候，就可以勾选SSL.
这样我们就配置好了SSL了。