Bug 2225377

Summary: AVCs for accessing Samba registry
Product: [Fedora] Fedora Reporter: Alexander Bokovoy <abokovoy>
Component: selinux-policyAssignee: Zdenek Pytela <zpytela>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 38CC: dwalsh, lvrabec, mmalik, nknazeko, omosnacek, pkoncity, vmojzis, zpytela
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Hardware: Unspecified   
OS: Linux   
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Description Alexander Bokovoy 2023-07-25 06:48:35 UTC 
FreeIPA upstream tests uncovered an issue in SELinux policy for Samba. Samba installs a dispatcher hook to NetworkManager and this hook is ran by the NetworkManager in a network status change situation.

When a network change happens, the hook runs a testparm to check whether configuration has been extended to provide an offline logon support.

In FreeIPA environment this means looking into the Samba registry. However, an SELinux policy does not allow 'NetworkManager_dispatcher_winbind_t' context to access 'samba_var_t' context.

http://freeipa-org-pr-ci.s3-website.eu-central-1.amazonaws.com/jobs/83a8ea8e-2a8b-11ee-8aec-fa163e33b8c8/test_integration-test_adtrust_install.py-TestIpaAdTrustInstall-uninstall/master.ipa.test/var/log/audit/audit.log.gz

type=SERVICE_START msg=audit(1690250776.068:4270): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=NetworkManager-dispatcher comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'UID="root" AUID="unset"
type=AVC msg=audit(1690250776.237:4271): avc:  denied  { read write } for  pid=15249 comm="testparm" name="registry.tdb" dev="vda5" ino=215804 scontext=system_u:system_r:NetworkManager_dispatcher_winbind_t:s0 tcontext=unconfined_u:object_r:samba_var_t:s0 tclass=file permissive=1
type=AVC msg=audit(1690250776.238:4272): avc:  denied  { open } for  pid=15249 comm="testparm" path="/var/lib/samba/registry.tdb" dev="vda5" ino=215804 scontext=system_u:system_r:NetworkManager_dispatcher_winbind_t:s0 tcontext=unconfined_u:object_r:samba_var_t:s0 tclass=file permissive=1
type=AVC msg=audit(1690250776.240:4273): avc:  denied  { lock } for  pid=15249 comm="testparm" path="/var/lib/samba/registry.tdb" dev="vda5" ino=215804 scontext=system_u:system_r:NetworkManager_dispatcher_winbind_t:s0 tcontext=unconfined_u:object_r:samba_var_t:s0 tclass=file permissive=1
type=AVC msg=audit(1690250776.240:4274): avc:  denied  { getattr } for  pid=15249 comm="testparm" path="/var/lib/samba/registry.tdb" dev="vda5" ino=215804 scontext=system_u:system_r:NetworkManager_dispatcher_winbind_t:s0 tcontext=unconfined_u:object_r:samba_var_t:s0 tclass=file permissive=1
type=AVC msg=audit(1690250776.240:4275): avc:  denied  { map } for  pid=15249 comm="testparm" path="/var/lib/samba/registry.tdb" dev="vda5" ino=215804 scontext=system_u:system_r:NetworkManager_dispatcher_winbind_t:s0 tcontext=unconfined_u:object_r:samba_var_t:s0 tclass=file permissive=1


Reproducible: Always