Hi,
I'm still looking at adding SELinux support in the "at" daemon and I now
have the following patch[0].
With this patch, at seems to behave like the cron daemon, as explained
in the commit log:
- When cron_userdomain_transition is set to off, a process for an
unconfined user will transition to unconfined_cronjob_t. For confined
user, the job is run as cronjob_t.
- When cron_userdomain_transition is set to on, the processes are run
under the user default context.
But every time an AVC denial is generated (with
cron_userdomain_transition set to off and the user running as staff_u,
in permissive with unmodified refpolicy):
avc: denied { entrypoint } for scontext=staff_u:staff_r:cronjob_t:s0
tcontext=staff_u:object_r:user_cron_spool_t:s0 tclass=file
The job runs as (id -Z): staff_u:staff_r:cronjob_t:s0
But audit2{allow,why} are saying that this is already allowed in the policy
Setting the cron_userdomain_transition boolean to on, I have the
following avc:
avc: denied { entrypoint } for scontext=staff_u:sysadm_r:sysadm_t:s0
tcontext=staff_u:object_r:user_cron_spool_t:s0 tclass=file
The job runs as (id -Z): staff_u:sysadm_r:sysadm_t:s0
So as said it seems to work, but I'm not sure why this AVC denial is
generated.
sesearch shows:
$ sesearch -ATSC -t user_cron_spool_t -c file -p entrypoint
Found 6 semantic av rules:
allow files_unconfined_type file_type : file { ioctl read write
create getattr setattr lock relabelfrom relabelto append unlink link
rename execute swapon quotaon mounton execute_no_trans entrypoint open
audit_access } ;
DT allow unconfined_t user_cron_spool_t : file entrypoint ; [
cron_userdomain_transition ]
DT allow user_t user_cron_spool_t : file entrypoint ; [
cron_userdomain_transition ]
EF allow cronjob_t user_cron_spool_t : file entrypoint ; [
cron_userdomain_transition ]
DT allow staff_t user_cron_spool_t : file entrypoint ; [
cron_userdomain_transition ]
DT allow sysadm_t user_cron_spool_t : file entrypoint ; [
cron_userdomain_transition ]
Did I overlooked something?
Cheers,
Laurent Bigonville
[0]
https://anonscm.debian.org/cgit/users/bigon/at.git/commit/?h=selinux&id=0112f006b74a36f7200e315575fd25d78e11b170
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