Bug 1252937
| Summary: | samba can not perform join when running in samba_net_t context | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Patrik Kis <pkis> |
| Component: | selinux-policy | Assignee: | Lukas Vrabec <lvrabec> |
| Status: | CLOSED ERRATA | QA Contact: | Milos Malik <mmalik> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.1 | CC: | lvrabec, mgrepl, mmalik, pkis, plautrba, pvrabec, rhack, ssekidde |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-3.13.1-43.el7 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2015-11-19 10:43:36 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: | |||
In permissive mode one more AVC denial appeared:
type=PROCTITLE msg=audit(08/13/2015 05:10:52.453:1083) : proctitle=/usr/bin/net -s /var/cache/realmd/realmd-smb-conf.M0YV2X -U Amy-admin ads join ad.baseos.qe
type=SYSCALL msg=audit(08/13/2015 05:10:52.453:1083) : arch=aarch64 syscall=unlinkat success=yes exit=0 a0=0xffffffffffffff9c a1=0x2aac932fdf0 a2=0x0 a3=0x2aac9330bf0 items=0 ppid=30537 pid=31028 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=net exe=/usr/bin/net subj=system_u:system_r:samba_net_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(08/13/2015 05:10:52.453:1083) : avc: denied { unlink } for pid=31028 comm=net name=31028 dev="dm-0" ino=136370653 scontext=system_u:system_r:samba_net_t:s0-s0:c0.c1023 tcontext=system_u:object_r:samba_var_t:s0 tclass=sock_file permissive=1
We need to add manage_sock_files_pattern(samba_net_t, samba_var_t, samba_var_t) Patrik, are you willing to test the functional part of the bug? commit 5b8de5e427c51ada8578e93294c9e64294f8e33e
Author: Lukas Vrabec <lvrabec>
Date: Tue Aug 18 10:02:06 2015 +0200
Allow samba_net_t to manage samba_var_t sock files.
Resolves: #1252937
(In reply to Milos Malik from comment #3) > Patrik, are you willing to test the functional part of the bug? No problem. The fictional test was executed and passed; no AVC denials were logged. 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://rhn.redhat.com/errata/RHBA-2015-2300.html |
Description of problem: With the new samba in RHEL-7.2 new AVC denials appeared. It looks like it does something extra compared to the old version but as far as I can tell it's ok. The problem appears only when the affected command line tool runs in samba_net_t context, i.e. executed by an external program like realmd. type=PROCTITLE msg=audit(08/12/2015 10:28:06.468:591) : proctitle=/usr/bin/net -d 1 -s /var/cache/realmd/realmd-smb-conf -U amy-admin ads join ad.baseos.qe type=SYSCALL msg=audit(08/12/2015 10:28:06.468:591) : arch=aarch64 syscall=bind success=no exit=-13(Permission denied) a0=0x6 a1=0x3ffdf0c5d08 a2=0x6e a3=0xffffff80 items=0 ppid=2438 pid=17008 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=5 comm=net exe=/usr/bin/net subj=system_u:system_r:samba_net_t:s0-s0:c0.c1023 key=(null) type=AVC msg=audit(08/12/2015 10:28:06.468:591) : avc: denied { create } for pid=17008 comm=net name=17008 scontext=system_u:system_r:samba_net_t:s0-s0:c0.c1023 tcontext=system_u:object_r:samba_var_t:s0 tclass=sock_file permissive=0 Version-Release number of selected component (if applicable): selinux-policy-3.13.1-41.el7 samba-4.2.3-4.el7 How reproducible: always Steps to Reproduce: runcon -u system_u -r system_r -t samba_net_t /usr/bin/net -d 1 -s /var/cache/realmd/realmd-smb-conf -U <USER> ads join <DOMAIN> OR via realmd: realm -v join --membership-software=samba -U <USER> <DOMAIN>