Title: Using the OpenBSD ports tree with dedicated users Author: Solène Date: 11 January 2020 Tags: openbsd Description: If you want to contribute to OpenBSD ports collection you will want to enable the`PORTS_PRIVSEP` feature. When this variable is set, ports system will use dedicated users for tasks. Source tarballs will be downloaded by the user _pfetch and all compilation and packaging will be done by the user _pbuild. Those users are created at system install and pf have a default rule to prevent _pbuild user doing network access. This will prevent ports from doing network stuff, and this is what you want. This adds a big security to the porting process and any malicious code run by ports being compiled will be harmless. In order to enable this feature, a few changes must be made. The file /etc/mk.conf must contains PORTS_PRIVSEP=yes SUDO=doas Then, /etc/doas.conf must allows your user to become \_pfetch and \_pbuild permit keepenv nopass solene as _pbuild permit keepenv nopass solene as _pfetch permit keepenv solene as root If you don't want to use the last line, there is an explanation in the bsd.port.mk(5) man page. Finally, within the ports tree, some permissions must be changed. # chown -R _pfetch:_pfetch /usr/ports/distfiles # chown -R _pbuild:_pbuild /usr/ports/{packages,plist,pobj,bulk} If directories doesn't exist yet on your system (this is the case on a fresh ports checkout / untar), you can create them with the commands: # install -d -o _pfetch -g _pfetch /usr/ports/distfiles # install -d -o _pbuild -g _pbuild /usr/ports/{packages,plist,pobj,bulk} Now, when you run a command in the ports tree, privileges should be dropped to according users.