How to create stunnel with systemd? stunnel

How to create stunnel with systemd?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 7+
  • systemd
  • stunnel

Issue

  • How to create stunnel with systemd?

Resolution

  • (Assuming Server side stunnel is already available and this is going to be client side.)

  • (Optional) copy .pem file from server to client (Using scp, ftp, sftp or whatever option available for copy data from one system to another)

  • Example of stunnel.conf

    [root@dhcp234-128 ~]# cat /etc/stunnel/stunnel.conf 
    setuid = nobody
    setgid = nobody
    pid =
    foreground = yes
    ;cert = /etc/stunnel/stunnel.pem  ## Location of .pem copied from server (uncomment if using a .pem file)
    options = NO_SSLv2
    [myservice]
    client = yes
    accept = 127.0.0.1:8080
    connect = 192.168.3.244:8888
    
  • Create unit file for systemd. At the time of writing this article, there is no default unit file systemd is providing. Engineering request has been filed for the same to ship default unit file.

    [root@dhcp234-128 ~]# cat /etc/systemd/system/stunnel.service
    [Unit]
    Description=SSL tunnel for network daemons
    Documentation=man:stunnel https://www.stunnel.org/docs.html
    DefaultDependencies=no
    After=network.target
    After=syslog.target
    
    [Install]
    WantedBy=multi-user.target
    Alias=stunnel.target
    
    [Service]
    Type=forking
    EnvironmentFile=-/etc/sysconfig/stunnel.conf 
    ExecStart=/usr/bin/stunnel /etc/stunnel/stunnel.conf
    #LimitNOFILE=infinity            <-- uncomment to increase maximum number of client connections
    
    [root@dhcp234-128 ~]# 
    
  • Check if stunnel is already running.

    [root@dhcp234-128 ~]# netstat -tnlp | grep stunnel
    
  • Enable and start the service.

    [root@dhcp234-128 ~]# systemctl enable stunnel.service --now
    
  • Verify if it's running.

    [root@dhcp234-128 ~]# ps -ef | grep stunnel
    nobody    2517     1  0 01:06 ?        00:00:00 /usr/bin/stunnel /etc/stunnel/stunnel.conf
    nobody    2518     1  0 01:06 ?        00:00:00 /usr/bin/stunnel /etc/stunnel/stunnel.conf
    nobody    2519     1  0 01:06 ?        00:00:00 /usr/bin/stunnel /etc/stunnel/stunnel.conf
    nobody    2520     1  0 01:06 ?        00:00:00 /usr/bin/stunnel /etc/stunnel/stunnel.conf
    nobody    2521     1  0 01:06 ?        00:00:00 /usr/bin/stunnel /etc/stunnel/stunnel.conf
    nobody    2522     1  0 01:06 ?        00:00:00 /usr/bin/stunnel /etc/stunnel/stunnel.conf
    [root@dhcp234-128 ~]# 
    
  • Verify if it's listening on correct port configured for it.

    [root@dhcp234-128 ~]# netstat -tnlp | grep stunnel
    tcp        0      0 127.0.0.1:8080          0.0.0.0:*               LISTEN      2522/stunnel        
    [root@dhcp234-128 ~]# 
    
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