Synchronet v3.21e-Win32 (install) has been released (Mar-2026).

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howto:linux_non-root [2015/09/22 15:52] – created deucehowto:linux_non-root [2023/03/09 10:40] (current) – add link to systemd unit file digital man
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-====== Linux Non-root ======+====== Start Synchronet on Linux as a Non-root user ======
  
-A simple way that will allow Linux Synchronet to run completely as non-root is to explicitly allow the binary to bind low ports using the setcap command.+===== systemd ===== 
 +If you're running any kind of recent (last 2yrs+) systemd, just put this line in the ''[Service]'' section of your ''[[https://gitlab.synchro.net/main/sbbs/-/blob/master/install/systemd/sbbs.service|sbbs.service]]'' file, if it isn't already:\\ 
 +''**AmbientCapabilities=CAP_NET_BIND_SERVICE**''
  
-<code>sudo /sbin/setcap 'cap_net_bind_service=ep' /sbbs/exec/sbbs</code>+===== setcap ===== 
 +''setcap'' may be used to allow Synchronet (''sbbs'') for Linux to run completely as a **non-root** user by explicitly allowing the binary to bind low ports using the command-line: 
 + 
 +  $ sudo /sbin/setcap 'cap_net_bind_service=+ep' `realpath /sbbs/exec/sbbs` 
 + 
 +This will need to be re-ran any time the binary is rebuilt and can be automated by adding the ''setcap'' target to your ''make'' command-line executed in ''src/sbbs3'': 
 +  $ make RELEASE=1 setcap symlinks 
 +   
 +To confirm the bind capabilities were set successfully, run: 
 +  $ sudo getcap `realpath /sbbs/exec/sbbs` 
 +  /path/to/sbbs = cap_net_bind_service+ep 
 +===== authbind ===== 
 + 
 +An alternative may be to use authbind.  
 + 
 +Install authbind using your favorite package manager for your Linux Distribution. 
 + 
 +Configure it to grant access to the relevant ports, e.g. to allow 80, 21, 23,25, 110, etc 443 from all users and groups: 
 + 
 +  sudo touch /etc/authbind/byport/80 
 + 
 +  sudo touch /etc/authbind/byport/443 
 + 
 +and so forth for all ports you are using below 1025 ... 
 + 
 +  sudo chmod 777 /etc/authbind/byport/80 
 + 
 +  sudo chmod 777 /etc/authbind/byport/443 
 + 
 +and so forth for all ports you are using below 1025 
 + 
 +Now execute your command via authbind (optionally specifying --deep or other arguments, see the man page): 
 + 
 +  sudo authbind --deep /sbbs/exec/sbbs -d
  
-This must be ran on the binary itself (if /sbbs/exec/sbbs is a symlink, apply it to the target of the link instead).  This will need to be re-ran any time the binary is rebuilt. 
  
-A better alternative may be authbind: 
  
-[TODO] 
  
 ===== See Also ===== ===== See Also =====
   * [[:howto:|howto index]]   * [[:howto:|howto index]]
  
-{{tag>}}+{{tag>linux}}
  

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