FreeBSD 5.x/6.x Setting permissions on devices

The simplest option is /etc/devfs.conf, however this only works on devices
that exist at boot time and do not ever disappear.

Using devfs.rules, this problem can be avoided; however, it is a bit more
complicated to set up.

Create or edit /etc/devfs.rules and put something like this in it:

[devfsrules_mybox=10]
add path 'fd0*' mode 660

See man 8 devfs for more information.

Then put in /etc/rc.conf

devfs_system_ruleset="devfsrules_mybox"

If you want to edit other /dev mountpoints (e.g. for jails) use something like

devfs_set_rulesets="/usr/jails/jail1/dev=devfsrules_jail1 /usr/jails/jail2/dev=devfsrules_jail2"

-- 
Jilles Tjoelker