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Description of problem:
Upon changing a printer status, cupsd sends a DBus notification through its notifier /usr/lib/cups/notifier/dbus, running in same context as cupsd, *cupsd_t*.
If the GUI is in GDM chooser, this leads to getting a USER_AVC:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
type=USER_AVC msg=audit(11/17/2022 14:07:50.723:319) : pid=755 uid=dbus auid=unset ses=unset subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc: denied { send_msg } for scontext=system_u:system_r:cupsd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tclass=dbus permissive=0 exe=/usr/bin/dbus-broker sauid=dbus hostname=? addr=? terminal=?'
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
The reason for this is cupsd sends the notification, dbus-broker wants to relay it to the registered consumer /usr/libexec/gsd-print-notifications, but this fails because the consumer executes as *xdm_t* and there is no rule to allow this in the policy.
Following rule is missing:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
allow cupsd_t xdm_t:dbus send_msg;
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
Version-Release number of selected component (if applicable):
selinux-policy-34.1.43-1.el9.noarch
How reproducible:
Always
Steps to Reproduce:
1. Install a system with Graphical Interface and let it sit at GDM chooser
2. Add a printer to Cups
localhost:631 -> Administration -> Add Printer -> Local Printer: "CUPS-BRF (Virtual Braille BRF Printer)" -> Name: "test" -> ...
3. Toogle the printer status
# cupsdisable test
# cupsenable test
Actual results:
USER_AVC
Expected results:
No USER_AVC
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 (selinux-policy bug fix and enhancement update), 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-2023:6617
Description of problem: Upon changing a printer status, cupsd sends a DBus notification through its notifier /usr/lib/cups/notifier/dbus, running in same context as cupsd, *cupsd_t*. If the GUI is in GDM chooser, this leads to getting a USER_AVC: -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- type=USER_AVC msg=audit(11/17/2022 14:07:50.723:319) : pid=755 uid=dbus auid=unset ses=unset subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc: denied { send_msg } for scontext=system_u:system_r:cupsd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tclass=dbus permissive=0 exe=/usr/bin/dbus-broker sauid=dbus hostname=? addr=? terminal=?' -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- The reason for this is cupsd sends the notification, dbus-broker wants to relay it to the registered consumer /usr/libexec/gsd-print-notifications, but this fails because the consumer executes as *xdm_t* and there is no rule to allow this in the policy. Following rule is missing: -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- allow cupsd_t xdm_t:dbus send_msg; -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- Version-Release number of selected component (if applicable): selinux-policy-34.1.43-1.el9.noarch How reproducible: Always Steps to Reproduce: 1. Install a system with Graphical Interface and let it sit at GDM chooser 2. Add a printer to Cups localhost:631 -> Administration -> Add Printer -> Local Printer: "CUPS-BRF (Virtual Braille BRF Printer)" -> Name: "test" -> ... 3. Toogle the printer status # cupsdisable test # cupsenable test Actual results: USER_AVC Expected results: No USER_AVC