Bug 1465729

So here is the `sudo ausearch -c snapper | audit2allow` output after setting SELinux permissive. 

Bear in mind that the tool snapper is the one creating those files initially anyway, so in theory they should not be mislabled? 



#============= snapperd_t ==============
allow snapperd_t self:capability fowner;
allow snapperd_t snapperd_data_t:dir relabelfrom;
allow snapperd_t snapperd_data_t:file relabelfrom;

#!!!! The file '/.snapshots' is mislabeled on your system.
#!!!! Fix with $ restorecon -R -v /.snapshots
#!!!! This avc is a constraint violation.  You would need to modify the attributes of either the source or target types to allow this access.
#Constraint rule:
#       constrain dir { create relabelfrom relabelto } ((u1 == u2 -Fail-)  or (t1 == can_change_object_identity -Fail-) ); Constraint DENIED

#       Possible cause is the source user (system_u) and target user (unconfined_u) are different.
#       Possible cause is the source level (s0-s0:c0.c1023) and target level (s0) are different.
allow snapperd_t user_home_dir_t:dir relabelto;
allow snapperd_t user_home_dir_t:dir create;
allow snapperd_t user_home_dir_t:file { create rename write };

#!!!! This avc is a constraint violation.  You would need to modify the attributes of either the source or target types to allow this access.
#Constraint rule:
#       constrain dir { create relabelfrom relabelto } ((u1 == u2 -Fail-)  or (t1 == can_change_object_identity -Fail-) ); Constraint DENIED

#       Possible cause is the source user (system_u) and target user (unconfined_u) are different.
#       Possible cause is the source level (s0-s0:c0.c1023) and target level (s0) are different.
allow snapperd_t user_home_t:dir relabelto;
allow snapperd_t user_home_t:file relabelto;

Hi, I submitted a PR that addresses this issue (and also BZ-1180876, partially) some weeks ago, perhaps someone can review it and merge it to the appropriate branch? Fortunately, the issue was simple to solve, the problem was the context definitions for the home directory were wrong; they were simply not using the HOME_ROOT variable (and therefore they were not being moved to the file_contexts.homedirs file which has a "higher priority" than the file_contexts file).

PR: https://github.com/fedora-selinux/selinux-policy-contrib/pull/19

Thank you.

Aug 02 18:00:04 f26s.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=snapper-timeline comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Aug 02 18:00:05 f26s.localdomain dbus-daemon[663]: [system] Activating service name='org.opensuse.Snapper' requested by ':1.798' (uid=0 pid=14446 comm="/usr/libexec/snapper/systemd-helper --timeline " label="system_u:system_r:unconfined_service_t:s0") (using servicehelper)
Aug 02 18:00:05 f26s.localdomain audit[14450]: AVC avc:  denied  { relabelto } for  pid=14450 comm="snapperd" name="info.xml" dev="dm-4" ino=258 scontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:var_t:s0 tclass=file permissive=0
Aug 02 18:00:05 f26s.localdomain audit[14450]: AVC avc:  denied  { create } for  pid=14450 comm="snapperd" name="2" scontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:var_t:s0 tclass=dir permissive=0
Aug 02 18:00:05 f26s.localdomain systemd[1]: snapper-timeline.service: Main process exited, code=exited, status=1/FAILURE
Aug 02 18:00:05 f26s.localdomain systemd[1]: snapper-timeline.service: Unit entered failed state.
Aug 02 18:00:05 f26s.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=snapper-timeline comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'
Aug 02 18:00:05 f26s.localdomain systemd[1]: snapper-timeline.service: Failed with result 'exit-code'.
Aug 02 18:00:45 f26s.localdomain setroubleshoot[14453]: SELinux is preventing snapperd from relabelto access on the file info.xml. For complete SELinux messages run: sealert -l 0ba67353-c577-469a-bfb8-22785e525a0c
Aug 02 18:00:45 f26s.localdomain python3[14453]: SELinux is preventing snapperd from relabelto access on the file info.xml.
                                                 If you want to allow snapperd to have relabelto access on the info.xml file
                                                 If you believe that snapperd should be allowed relabelto access on the info.xml file by default.
                                                 # ausearch -c 'snapperd' --raw | audit2allow -M my-snapperd
                                                 # semodule -X 300 -i my-snapperd.pp



Except these two commands do not resolve the problem, error remains. Relabling doesn't fix it either.

selinux-policy-3.13.1-260.3.fc26.noarch
snapper-0.5.0-1.fc26.x86_64

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