Date: Wed, 17 Sep 2014 10:04:19 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Hans Petter Selasky <hps@selasky.org>, freebsd-stable List <stable@FreeBSD.org>, FreeBSD Current <freebsd-current@FreeBSD.org> Cc: freebsd-desktop@FreeBSD.org Subject: Re: Fwd: usb printer vs cups Message-ID: <54193273.6080709@FreeBSD.org> In-Reply-To: <5419285D.8020909@selasky.org> References: <54133325.9070302@FreeBSD.org> <5419238E.8050708@FreeBSD.org> <5419285D.8020909@selasky.org>
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On 17/09/2014 09:21, Hans Petter Selasky wrote: > On 09/17/14 08:00, Andriy Gapon wrote: >> >> Soliciting help. >> >> -------- Forwarded Message -------- >> >>> From my experience I think that cupsd executes backend tools with all uids and >> gids set to cups and no supplementary groups. In the case of USB printers the >> backends need to access /dev/usbctl and /dev/usb/foobar that corresponds to a >> printer. That means that the access to those devices must be somehow granted to >> cups:cups. >> How do people solve this? What kind of permissions / configuration do you use? >> >> P.S. >> Maybe I over-generalized the issue to all USB printers. My personal experience >> is with an HP printer handled by hplip / hplip-plugin. >> > > Hi, > > The /usr/ports/print/cups-base should be updated. > > The pkg-message should not say that: > > > # FreeBSD 8.x > add path 'usb*' mode 0770 group cups > add path 'ugen*' mode 0660 group cups > > add path 'usb/0.2.*' mode 0660 group cups > > Is needed. This is wrong. > > Instead make cups-base install the attached devd configuration file in > /usr/local/etc/devd/ which does the needed chown for printers only. The problem is that my printer does not work if I also do not change permissions on /dev/usbctl. But I do not really want /dev/usbctl to be owned by cups as there can be other services / users that need access to usbctl. Is there anything smarter than mucking with device ownership? In other words, I have no problem granting cups user or group a full access to all USB devices. I have a problem with changing owner or group of USB devices to cups, because that interferes with other accesses to those devices. -- Andriy Gapon
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