** Also affects: gvfs (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: tracker-miners (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: tracker-miners (Ubuntu Focal)
Status: New => In Progress
** Changed in: tracker-miners (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: tracker-miners (Ubuntu Focal)
Assignee: (unassigned) => Matthew Ruffell (mruffell)
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https://bugs.launchpad.net/bugs/1779890
Title:
gvfsd process does not have the KRB5CCNAME environment set
Status in gvfs package in Ubuntu:
New
Status in tracker-miners package in Ubuntu:
Fix Released
Status in gvfs source package in Focal:
New
Status in tracker-miners source package in Focal:
In Progress
Status in gvfs source package in Jammy:
New
Status in tracker-miners source package in Jammy:
In Progress
Status in gvfs source package in Kinetic:
New
Status in tracker-miners source package in Kinetic:
In Progress
Bug description:
[ Impact ]
The KRB5CCNAME environment variable points to the Kerberos ticket of the
current machine and this ticket is used for authentication in Active Directory
servers.
This variable is set by pam_sss when the user authenticates and can be
used by other processes, such as gio, to skip the credentials input
when accessing network shares, for example.
Some services rely on gvfs-daemon in order to properly function, such
as tracker-extract-3.service and tracker-miner-fs-3.service, which
means they will ask for the gvfs-daemon to be initialized when they
are executed by systemd. This creates problems if one service that
relies on gvfsd is started too early, as it would result in gvfsd
being started too early as well.
As of version 3.1 of tracker-miners, the install target of tracker-
miners-fs-3.service was set to gnome-session.target:
https://gitlab.gnome.org/GNOME/tracker-miners/-/merge_requests/283
However, the tracker-extract-3.service was not updated and its target
is still default.target, which is too early for the service to start.
Starting tracker-extract too early is also starting gvfsd too early,
before the session environment gets fully updated. Which means that
gvfsd does not have the KRB5CCNAME variable and can not do any
operations with it.
Tracker-extract is supposed to be a helper service managed by tracker-
miner-fs-3.service. By using a [Install] section, we are actually
telling systemd that it should manage this service as well, when it
shouldn't.
So, by removing the [Install] section and having tracker-miner-
fs-3.service being tied to gnome-session.target, we fix the issue of
gvfsd starting too early without the updated session environment.
[ Test Plan ]
In order to test this issue, it's required to have an Active Directory server
running.
1) Authenticate with an AD user (as this would set the KRB5CCNAME env);
2) Check gvfsd environment. This can be done by running:
cat /proc/$(pidof gvfsd)/environ | xargs --null -n1
You will be able to see that it does not have the variable listed.
3) Check that the information mentioned above about tracker-miner-fs-
3.service is true.
4) Disable tracker-extract-3.service (This is a bit tricky, since its
target was default.target. The easiest way is to remove the symlink that
systemd created when enabling the unit, located under
/etc/systemd/user/default.target.wants/tracker-extract-3.service
5) Reboot the machine;
6) Repeat steps 1 and 2.
This will show that gvfsd is now started with the proper environment.
Is not enough to look at ptree and the pids of the processes, instead
it's better to look into the session logs with:
journalctl --user -b
And check the order in which the services were started and when they
were triggered.
[ Where problems could occur ]
The tracker project is a search engine that speeds up search operations in
Gnome. The tracker-miners is the indexing daemon that populates the database
with information, so changing its start does not affect the system behavior.
This changes fix the startup of gvfs-daemon.service, which could delay
services that relied on it running to be executed.
## Original description ##
Nautilus prompts for username and password when accessing a Samba share on a
network drive, despite having a perfectly valid unexpired Kerberos ticket. The
Kerberos ticket is obtained automatically at logon by authentication against a
Samba Active Directory server (Samba AD-DC).
Accessing the same Samba share with the same Kerberos ticket via
"smbclient //host/sharename -k" works fine.
One known workaround is: "nautilus -q", and then "killall gvfsd".
After that, accessing the Samba share with Nautilus works normally as
it should.
I did not experience this issue in Ubuntu 16.04. It appears that a
regression was introduced somewhere between 16.04 and 18.04.
The issue is quite annoying and confusing for the users who are used
to accessing Samba shares on the network drive without being prompted
for their username and password.
The issue appears to manifest itself usually not on the first access
to a Samba share, but on subsequent accesses after a system reboot or
upon user logout/login. Strangely, removing ~/.cache/ibus/bus/registry
file before user login appears to fix the issue for the current user
session, but then the problem reappears upon subsequent user logins or
after a system reboot.
Nemo appears to have the same problem as Nautilus.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gvfs-daemons 1.36.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Tue Jul 3 11:12:06 2018
ExecutablePath: /usr/lib/gvfs/gvfsd
InstallationDate: Installed on 2018-04-27 (66 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
LANG=en_CA.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
XDG_RUNTIME_DIR=<set>
SourcePackage: gvfs
UpgradeStatus: No upgrade log present (probably fresh install)
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