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Ubuntu 16.04及以上版本通常自带Snapd，如果你的系统还没有安装，可以通过以下命令安装：
安装Certbot#
使用Snap安装Certbot，确保你获得的是最新版本：
bash
sudo snap install --classic certbot
- 准备Certbot命令#
确保Certbot命令可以通过创建一个符号链接到/usr/bin目录中的命令来运行：
bash
sudo ln -s /snap/bin/certbot /usr/bin/certbot
实例
root@mail:~# apt-get install cerbot
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package cerbot
root@mail:~# exit
logout
wqbboy@mail:~$ sudo apt-get install cerbot
[sudo] password for wqbboy:
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package cerbot
wqbboy@mail:~$ sudo apt install snapd
[sudo] password for wqbboy:
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Suggested packages:zenity | kdialog
The following packages will be upgraded:snapd
1 upgraded, 0 newly installed, 0 to remove and 11 not upgraded.
Need to get 26.4 MB of archives.
After this operation, 2,134 kB of additional disk space will be used.
Get:1 http://cn.archive.ubuntu.com/ubuntu jammy-updates/main amd64 snapd d64 2.65.3+22.04 [26.4 MB]
Fetched 26.4 MB in 3s (9,407 kB/s)
(Reading database ... 89736 files and directories currently installed.)
Preparing to unpack .../snapd_2.65.3+22.04_amd64.deb ...
Unpacking snapd (2.65.3+22.04) over (2.63+22.04ubuntu0.1) ...
Setting up snapd (2.65.3+22.04) ...
Installing new version of config file /etc/apparmor.d/usr.lib.snapd.snap-nfine.real ...
snapd.failure.service is a disabled or a static unit not running, not staing it.
snapd.snap-repair.service is a disabled or a static unit not running, nottarting it.
Processing triggers for dbus (1.12.20-2ubuntu4.1) ...
Processing triggers for mailcap (3.70+nmu1ubuntu1) ...
Processing triggers for man-db (2.10.2-1) ...
Scanning processes... [ Scanning processes... [ Scanning processes... [ Scanning processes... [ Scanning processes... [= Scanning processes... [= Scanning linux images... [================================= Scanning linux images... Running kernel seems to be up-to-date.No services need to be restarted.No containers need to be restarted.No user sessions are running outdated binaries.No VM guests are running outdated hypervisor (qemu) binarie s on this host.查看版本
wqbboy@mail:~$ snap version
snap 2.65.3+22.04
snapd 2.65.3+22.04
series 16
ubuntu 22.04
kernel 5.15.0-124-generic
wqbboy@mail:~$ sudo snap install --classic certbot
certbot 2.11.0 from Certbot Project (certbot-eff✓) installed
wqbboy@mail:~$ ln -s /snap/bin/certbot /usr/bin/certbot
ln: failed to create symbolic link '/usr/bin/certbot': Permission denied
wqbboy@mail:~$ sudo ln -s /snap/bin/certbot /usr/bin/certbot
[sudo] password for wqbboy:
wqbboy@mail:~$ sudo nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful安装openssl
wqbboy@mail:~$ sudo apt-get install openssl
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
openssl is already the newest version (3.0.2-0ubuntu1.18).
openssl set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded.wqbboy@mail:~$ cd /etc/nginx/
wqbboy@mail:/etc/nginx$ ls
conf-available modules-available sites-available.bak
conf.d modules-enabled sites-enabled
conf-enabled netdata.users sites-enabled.bak
fastcgi.conf nginx.conf snippets
fastcgi_params nginx.conf.2024.10.20.03.13.29 templates
koi-utf proxy_params uwsgi_params
koi-win scgi_params win-utf
mime.types sites-available
生成私钥和 CSR（证书签名请求）：
wqbboy@mail:/etc/nginx$ sudo openssl req -newkey rsa:2048 -nodes -keyout /etc/nginx/ssl/nginx.key -out /etc/nginx/ssl/nginx.csr
.+......+.....+.+......+..+...............+...............+......+.+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.+....+..+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*......+...+......+......+.+............+..+.+.....+...+.......+.....+....+.....+..........+........+.+..+...+.+...+...+...+......+......+........+.......+........+.+...+...............+............+.....+....+.....+.........+.+..........................+.+...+..+..........+.....+...+...............+......+......+.......+........+...+............+...+.+.....+.+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
.....+..........+.....+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.....+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.........+.+.....+...+.+........+.............+........+....+..+...+...+............+......................+...+......+...............+.....+....+.......................+...+................+...+............+......+..+.+..+.......+...+.................+.+......+...+..+..........+...+..................+..+.+...............+............+...+..+....+.....+...............+.+..+.+.....+......+.+.....+..................................+...+......+..+...+.........+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
req: Can't open "/etc/nginx/ssl/nginx.key" for writing, No such file or directory
wqbboy@mail:/etc/nginx$ sudo mkdir ssl
wqbboy@mail:/etc/nginx$ ls
conf-available modules-available sites-available.bak
conf.d modules-enabled sites-enabled
conf-enabled netdata.users sites-enabled.bak
fastcgi.conf nginx.conf snippets
fastcgi_params nginx.conf.2024.10.20.03.13.29 ssl
koi-utf proxy_params templates
koi-win scgi_params uwsgi_params
mime.types sites-available win-utf
wqbboy@mail:/etc/nginx$ sudo openssl req -newkey rsa:2048 -nodes -keyout /etc/nginx/ssl/nginx.key -out /etc/nginx/ssl/nginx.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) [AU]:CN
State or Province Name (full name) [Some-State]:HUBEI
Locality Name (eg, city) []:XGS
Organization Name (eg, company) [Internet Widgits Pty Ltd]:GA
Organizational Unit Name (eg, section) []:ZHZX
Common Name (e.g. server FQDN or YOUR name) []:mail.xgpolice.com
Email Address []:Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:生成自签名 SSL 证书：
wqbboy@mail:/etc/nginx$ sudo openssl x509 -req -days 3650 -in /etc/nginx/ssl/nginx.csr -signkey /etc/nginx/ssl/nginx.key -out /etc/nginx/ssl/nginx.crt
Certificate request self-signature ok
subject=C = CN, ST = HUBEI, L = XGS, O = GA, OU = ZHZX, CN = mail.xgpolice.com
wqbboy@mail:/etc/nginx$ sudo vi /etc/nginx/sites-available/00-default
00-default.conf 00-default-ssl.conf
wqbboy@mail:/etc/nginx$ sudo vi /etc/nginx/sites-available/00-default
00-default.conf 00-default-ssl.conf
wqbboy@mail:/etc/nginx$ sudo vi /etc/nginx/sites-available/00-default-ssl.conf
让我们在 /etc/nginx/snippets 目录下创建一个新的 Nginx 配置片段。
为了正确区分该文件的目的，让我们将其命名为 self-signed.conf：
在这个文件中，我们只需要将 ssl_certificate 指令设置为我们的证书文件，将
ssl_certificate_key 设置为相关的密钥。在我们的情况下，这将如下所示：
wqbboy@mail:/etc/nginx$ sudo nano /etc/nginx/snippets/self-signed.conf
wqbboy@mail:/etc/nginx$ sudo cat /etc/nginx/snippets/self-signed.conf
ssl_certificate /etc/nginx/ssl/nginx.crt;
ssl_certificate_key /etc/nginx/ssl/nginx.key;
wqbboy@mail:/etc/nginx$ ls
conf-available modules-available sites-available.bak
conf.d modules-enabled sites-enabled
conf-enabled netdata.users sites-enabled.bak
fastcgi.conf nginx.conf snippets
fastcgi_params nginx.conf.2024.10.20.03.13.29 ssl
koi-utf proxy_params templates
koi-win scgi_params uwsgi_params
mime.types sites-available win-utf
wqbboy@mail:/etc/nginx$ cd ssl
wqbboy@mail:/etc/nginx/ssl$ ls
nginx.crt nginx.csr nginx.key
wqbboy@mail:/etc/nginx/ssl$ cd /etc/nginx/sites-available
wqbboy@mail:/etc/nginx/sites-available$ ls
00-default.conf 00-default-ssl.conf
wqbboy@mail:/etc/nginx/sites-available$ sudo cp 00-default-ssl.conf 00-default-ssl.conf.bak
wqbboy@mail:/etc/nginx/sites-available$ ls
00-default.conf 00-default-ssl.conf 00-default-ssl.conf.bak
wqbboy@mail:/etc/nginx/sites-available$ sudo nano 00-default-ssl.conf调整 Nginx 配置以使用 SSL
wqbboy@mail:/etc/nginx/sites-available$ cd ..
wqbboy@mail:/etc/nginx$ ls
conf-available modules-available sites-available.bak
conf.d modules-enabled sites-enabled
conf-enabled netdata.users sites-enabled.bak
fastcgi.conf nginx.conf snippets
fastcgi_params nginx.conf.2024.10.20.03.13.29 ssl
koi-utf proxy_params templates
koi-win scgi_params uwsgi_params
mime.types sites-available win-utf
wqbboy@mail:/etc/nginx$ ls
conf-available modules-available sites-available.bak
conf.d modules-enabled sites-enabled
conf-enabled netdata.users sites-enabled.bak
fastcgi.conf nginx.conf snippets
fastcgi_params nginx.conf.2024.10.20.03.13.29 ssl
koi-utf proxy_params templates
koi-win scgi_params uwsgi_params
mime.types sites-available win-utf
wqbboy@mail:/etc/nginx$ ls snippets/
fastcgi-php.conf self-signed.conf snakeoil.conf
wqbboy@mail:/etc/nginx$ ls ssl/
nginx.crt nginx.csr nginx.key
wqbboy@mail:/etc/nginx$ ls sites-available
00-default.conf 00-default-ssl.conf 00-default-ssl.conf.bak
wqbboy@mail:/etc/nginx$ cd sites-available
wqbboy@mail:/etc/nginx/sites-available$ ls
00-default.conf 00-default-ssl.conf 00-default-ssl.conf.bak
wqbboy@mail:/etc/nginx/sites-available$ sudo nano 00-default-ssl.conf配置 Nginx 以使用自签名 SSL 证书：
wqbboy@mail:/etc/nginx/sites-available$ sudo nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
wqbboy@mail:/etc/nginx/sites-available$ sudo systemctl restart nginx
wqbboy@mail:/etc/nginx/sites-available$修改这个文件的ssl证书的key和crt文件路径。
wqbboy@mail:/etc/nginx/sites-available$ sudo vi /etc/nginx/templates/ssl.tmpl
[sudo] password for wqbboy:
wqbboy@mail:/etc/nginx/sites-available$ sudo vi /etc/nginx/templates/ssl.tmpl修改完后需要重新加载一下nginx配置
wqbboy@mail:/etc/nginx/sites-available$ sudo nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
wqbboy@mail:/etc/nginx/sites-available$ sudo nginx -s reload
wqbboy@mail:/etc/nginx/sites-available$ systemctl reload nginx
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to reload 'nginx.service'.
Authenticating as: wqbboy
Password:
==== AUTHENTICATION COMPLETE ===
wqbboy@mail:/etc/nginx/sites-available$配置 postfix
编辑 /etc/postfix/main.cf 文件以使用 SSL 证书。
wqbboy@mail:/etc/nginx/sites-available$ sudo vi /etc/postfix/main.cf
wqbboy@mail:/etc/nginx/sites-available$ cat /etc/postfix/main.cf | grep smtpd
smtpd_tls_key_file = /etc/nginx/ssl/nginx.key
smtpd_tls_cert_file = /etc/nginx/ssl/nginx.crt
smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtpd_tls_CApath = /etc/ssl/certs
smtpd_tls_protocols = !SSLv2 !SSLv3 !TLSv1 !TLSv1.1
smtpd_tls_mandatory_protocols = !SSLv2 !SSLv3 !TLSv1 !TLSv1.1
smtpd_tls_dh512_param_file = /etc/ssl/dh512_param.pem
smtpd_tls_dh1024_param_file = /etc/ssl/dh2048_param.pem
smtpd_tls_loglevel = 1
smtpd_tls_security_level = may
#smtpd_tls_received_header = yes
# Use the same CA file as smtpd.
smtpd_reject_unlisted_recipient = yes
smtpd_reject_unlisted_sender = yes
smtpd_command_filter = pcre:/etc/postfix/command_filter.pcre
smtpd_helo_required = yes
smtpd_helo_restrictions =
smtpd_sender_restrictions =
smtpd_recipient_restrictions =
smtpd_end_of_data_restrictions =
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_discard_ehlo_keywords = chunking
proxy_read_maps = $canonical_maps $lmtp_generic_maps $local_recipient_maps $mydestination $mynetworks $recipient_bcc_maps $recipient_canonical_maps $relay_domains $relay_recipient_maps $relocated_maps $sender_bcc_maps $sender_canonical_maps $smtp_generic_maps $smtpd_sender_login_maps $transport_maps $virtual_alias_domains $virtual_alias_maps $virtual_mailbox_domains $virtual_mailbox_maps $smtpd_sender_restrictions $sender_dependent_relayhost_maps
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
#smtpd_tls_auth_only = yes
smtpd_sender_login_maps =
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/dovecot-auth
wqbboy@mail:/etc/nginx/sites-available$ cat /etc/postfix/main.cf | grep smtpd_tls
smtpd_tls_key_file = /etc/nginx/ssl/nginx.key
smtpd_tls_cert_file = /etc/nginx/ssl/nginx.crt
smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtpd_tls_CApath = /etc/ssl/certs
smtpd_tls_protocols = !SSLv2 !SSLv3 !TLSv1 !TLSv1.1
smtpd_tls_mandatory_protocols = !SSLv2 !SSLv3 !TLSv1 !TLSv1.1
smtpd_tls_dh512_param_file = /etc/ssl/dh512_param.pem
smtpd_tls_dh1024_param_file = /etc/ssl/dh2048_param.pem
smtpd_tls_loglevel = 1
smtpd_tls_security_level = may
#smtpd_tls_received_header = yes
#smtpd_tls_auth_only = yes
wqbboy@mail:/etc/nginx/sites-available$ sudo systemctl restart postfix配置 dovecot
编辑 /etc/dovecot/dovecot.conf文件以使用 SSL 证书。
wqbboy@mail:/etc/nginx/sites-available$ sudo vi /etc/dovecot/dovecot.conf
wqbboy@mail:/etc/nginx/sites-available$ cat /etc/dovecot/dovecot.conf | greep ssl_
Command 'greep' not found, did you mean:command 'grep' from deb grep (3.7-1build1)command 'greed' from deb greed (4.2-1)
Try: sudo apt install <deb name>
wqbboy@mail:/etc/nginx/sites-available$ cat /etc/dovecot/dovecot.conf | grep ssl_
ssl_min_protocol = TLSv1.2
#ssl_ca = </path/to/ca
ssl_cert = </etc/nginx/ssl/nginx.crt
ssl_key = </etc/nginx/ssl/nginx.key
ssl_dh = </etc/ssl/dh2048_param.pem
ssl_cipher_list = EECDH+CHACHA20:EECDH+AESGCM:EDH+AESGCM:AES256+EECDH
ssl_prefer_server_ciphers = yes
wqbboy@mail:/etc/nginx/sites-available$
重启 Dovecot
wqbboy@mail:/etc/nginx/sites-available$ sudo systemctl restart dovecot
wqbboy@mail:/etc/nginx/sites-available$