Bug 1727382
| Summary: | Login to restricted acct fails | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Steve Grubb <sgrubb> |
| Component: | cockpit | Assignee: | Martin Pitt <mpitt> |
| Status: | CLOSED ERRATA | QA Contact: | Jan Ščotka <jscotka> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 8.0 | Keywords: | Rebase |
| Target Milestone: | rc | ||
| Target Release: | 8.2 | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-04-28 16:51:35 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1718814, 1727887, 1727902 | ||
| Bug Blocks: | 1755139, 1761915 | ||
|
Description
Steve Grubb
2019-07-05 19:13:51 UTC
Thanks Steve, much appreciated! When I login as unprivileged user, several "interesting" things happen. First of all, the systemd user instance segfaults:
user: Main process exited, code=killed, status=11/SEGV
user: Failed with result 'protocol'.
Failed to start User Manager for UID 1002.
This is possibly related to this SELinux denial:
AVC avc: denied { signal } for pid=17816 comm="systemd" scontext=guest_u:guest_r:guest_t:s0 tcontext=system_u:system_r:init_t:s0 tclass=process permissive=0
(systemd should not segfault on that, though, but perhaps crash with ABRT or exit non-zero)
This leads to the user bus not being able to start up:
cockpit-bridge[17819]: dbus-daemon didn't send us a dbus address; not installed?
and finally, cockpit-bridge can't listen to a TCP socket:
AVC avc: denied { listen } for pid=17819 comm="cockpit-bridge" laddr=127.0.0.1 lport=34295 scontext=guest_u:guest_r:guest_t:s0 tcontext=guest_u:guest_r:guest_t:s0 tclass=tcp_socket permissive=0
cockpit-bridge[17819]: couldn't bind and listen to local ipv4 socket: could not listen: Permission denied
cockpit-bridge[17819]: cockpit_packages_get_bridges: assertion 'packages != NULL' failed
and finally, cockpit isn't allowed to connect to polkit (but that shouldn't be fatal, it can also use sudo):
cockpit-bridge[17819]: couldn't get polkit authority: Error initializing authority: Could not connect: Permission denied
The systemd crash and the polkit failure are reproducible perfectly well with a ssh, I'll file bugs against selinux-policy and make this one depend on them.
I'll keep this bug for tracking the overall process and the addition of integration tests.
I filed the systemd segfault as 1727895. This doesn't happen on RHEL 8.1, only on Fedora 30. But this is just a follow-up bug to 1727887, and should be mostly harmless. After some discussion and validation of the depending bugs, this now works well enough. I filed https://github.com/cockpit-project/cockpit/pull/13085 to add an automatic test case to ensure that this stays working. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:1837 |