I was also affected by this bug (on Ubuntu 22.04.2 LTS with the latest
Firefox 112.0.1 from ppa:mozillateam). I don't want to use the snap
version of Firefox.
After digging around in AppArmor audit mode and inspecting the logs I noticed
that torbrowser (also based on Firefox) has a set of rule in its profile that
seem to resolve the issue:
/etc/apparmor.d/usr.bin.firefox
```
# u2f (tested with Yubikey 4)
/sys/class/ r,
/sys/bus/ r,
/sys/class/hidraw/ r,
/run/udev/data/c24{7,9}:* r,
/dev/hidraw* rw,
# Yubikey NEO also needs this:
/sys/devices/**/hidraw/hidraw*/uevent r,
```
(I am not sure to what extend other tokens need different rules.)
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1930769
Title:
When enabled, Firefox AppArmor profile prevents U2F devices from
working
Status in firefox package in Ubuntu:
Confirmed
Bug description:
Summary:
If you enable the apparmor profile that comes in Ubuntu's Firefox
package, it prevents USB U2F tokens from being used.
To reproduce:
1. Obtain a USB FIDO/U2F token - such as a Yubikey; and a clean
install of Ubuntu 20.04 with Firefox installed, but the AppArmor
profile for firefox disabled (As is the default).
2. Confirm the correct function of your U2F token - such as at
https://demo.yubico.com/webauthn-technical
3. Enable the AppArmor profile with the following command, then
restart firefox.
sudo aa-enforce /etc/apparmor.d/usr.bin.firefox
4. Repeat your test of your U2F token. You will find Firefox is unable
to access your U2F token. Any accounts you need U2F to log into are
now inaccessible.
5. Disabling the apparmor profile and restarting firefox will make U2F
work again.
To work around:
Edit /etc/apparmor.d/usr.bin.firefox and replace these lines:
# Doesn't seem to be required, but noisy. Maybe allow 'r' for 'b*' if
needed.
# Possibly move to an abstraction if anything else needs it.
deny /run/udev/data/** r,
Instead allowing access to udev data, and to hidraw devices:
/run/udev/data/** r,
/dev/hidraw[0-9] rw,
I haven't checked the security implications of this change; some might
feel it grants overly broad access. Chromium, which in 20.04 is
delivered as a snap, includes udev rules (70-snap.chromium.rules)
which I suspect grant access in a device-id-whitelisted way.
This is me resubmitting #1930768 this time with all the info attached.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: firefox 88.0.1+build1-0ubuntu0.20.04.2
ProcVersionSignature: Ubuntu 5.8.0-53.60~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-53-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: mtandy 1757 F.... pulseaudio
/dev/snd/controlC1: mtandy 1757 F.... pulseaudio
BuildID: 20210504152106
CasperMD5CheckResult: skip
Channel: Unavailable
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun 3 23:34:55 2021
ForcedLayersAccel: False
IncompatibleExtensions: Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
InstallationDate: Installed on 2021-05-31 (3 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64
(20210209.1)
IpRoute:
default via 192.168.0.1 dev enp3s0 proto dhcp metric 100
169.254.0.0/16 dev enp3s0 scope link metric 1000
192.168.0.0/24 dev enp3s0 proto kernel scope link src 192.168.0.2 metric 100
MostRecentCrashID: bp-4122b123-9c74-4baf-b817-c8a771171216
PrefErrors: Unexpected character ',' before close parenthesis @
/usr/lib/firefox/omni.ja:greprefs.js:352
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=88.0.1/20210504152106 (In use)
RunningIncompatibleAddons: True
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/11/2014
dmi.bios.release: 4.6
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2202
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z97-K
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr2202:bd07/11/2014:br4.6:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ97-K:rvrRevX.0x:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: ASUS MB
dmi.product.name: All Series
dmi.product.sku: All
dmi.product.version: System Version
dmi.sys.vendor: ASUS
mtime.conffile..etc.apparmor.d.usr.bin.firefox: 2021-06-03T23:25:44.143815
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