Leon Fauster
2016-Oct-24 16:53 UTC
[CentOS] SElinux suggestions needed: migrating backup service
Hi folks,
normally I have not so much to do with SElinux but I expected to get in touch
sooner or later :-)
I migrated a backup-system from El5 to EL6 and the rsync backup process is
complaining about selinux attr's now.
client <-> server (fetches via rsync -aHAX)
client# sestatus
SELinux status: disabled
server# sestatus
SELinux status: enabled
SELinuxfs mount: /selinux
Current mode: permissive
Mode from config file: permissive
Policy version: 24
Policy from config file: targeted
for example, no label for this file on client side:
client# ls -laZ /usr/share/zoneinfo/Africa/Bissau
-rw-r--r-- root root
/usr/share/zoneinfo/Africa/Bissau
but on server side:
rsync: rsync_xal_clear:
lremovexattr("usr/share/zoneinfo/Africa/.Bissau.WaE4wj","security.selinux")
failed: Permission denied (13)
and
server# ls -laZ /BACKUP/usr/share/zoneinfo/Africa/Bissau
-rw-r--r--. root root unconfined_u:object_r:locale_t:s0
usr/share/zoneinfo/Africa/Bissau
the local (server) destination is mounted like:
server# cat /proc/mounts |grep BACKUP
/dev/sdc1 /BACKUP ext3
rw,seclabel,nosuid,nodev,noatime,nodiratime,errors=continue,acl,barrier=1,data=ordered
0 0
this partition comes from the former system (EL5 productively used without
labeling it and with SElinux disabled).
I started to enable SElinux (permissive) on new systems and therefore disabling
SElinux
like it was done before on the former system is not an option.
Any suggestions to avoid the default labeling
"unconfined_u:object_r:locale_t:s0"?
--
Thanks,
LF
Gordon Messmer
2016-Oct-24 21:44 UTC
[CentOS] SElinux suggestions needed: migrating backup service
On 10/24/2016 09:53 AM, Leon Fauster wrote:> Any suggestions to avoid the default labeling "unconfined_u:object_r:locale_t:s0"?Not off the top of my head. I think you need to either a) not try to preserve the labels or b) run the backup as a user which can manage labels. What is the rsync command you are currently using, and what user does rsync run as on the backup server?
Leon Fauster
2016-Oct-24 23:43 UTC
[CentOS] SElinux suggestions needed: migrating backup service
Am 24.10.2016 um 23:44 schrieb Gordon Messmer <gordon.messmer at gmail.com>:> On 10/24/2016 09:53 AM, Leon Fauster wrote: >> Any suggestions to avoid the default labeling "unconfined_u:object_r:locale_t:s0"? > > > Not off the top of my head. I think you need to either a) not try to preserve the labels or b) run the backup as a user which can manage labels. What is the rsync command you are currently using, and what user does rsync run as on the backup server?Plain rsync -aHAX with some excludes and executed as root on the backup system. Doing so I get: <snip> rsync: rsync_xal_clear: lremovexattr("lib/modules/2.6.18-412.el5/modules.alias","security.selinux") failed: Permission denied (13) rsync: rsync_xal_clear: lremovexattr("lib/modules/2.6.18-412.el5/modules.ccwmap","security.selinux") failed: Permission denied (13) rsync: rsync_xal_clear: lremovexattr("lib/modules/2.6.18-412.el5/modules.dep","security.selinux") failed: Permission denied (13) rsync: rsync_xal_clear: lremovexattr("lib/modules/2.6.18-412.el5/modules.ieee1394map","security.selinux") failed: Permission denied (13) rsync: rsync_xal_clear: lremovexattr("lib/modules/2.6.18-412.el5/modules.inputmap","security.selinux") failed: Permission denied (13) rsync: rsync_xal_clear: lremovexattr("lib/modules/2.6.18-412.el5/modules.isapnpmap","security.selinux") failed: Permission denied (13) rsync: rsync_xal_clear: lremovexattr("lib/modules/2.6.18-412.el5/modules.ofmap","security.selinux") failed: Permission denied (13) rsync: rsync_xal_clear: lremovexattr("lib/modules/2.6.18-412.el5/modules.pcimap","security.selinux") failed: Permission denied (13) <snip> The thing is, that files from the source system that doesn't have a label get a new one on the destination system. Here is some kind of inheritance in place. client# ls -laZ /lib/modules/2.6.18-412.el5/modules.* -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.alias -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.ccwmap -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.dep -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.ieee1394map -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.inputmap -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.isapnpmap -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.ofmap -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.pcimap -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.seriomap -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.symbols -rw-r--r-- root root /lib/modules/2.6.18-412.el5/modules.usbmap backupserver# ls -laZ daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.* -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.alias -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.ccwmap -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.dep -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.ieee1394map -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.inputmap -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.isapnpmap -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.ofmap -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.pcimap -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.seriomap -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.symbols -rw-r--r--. root root unconfined_u:object_r:modules_object_t:s0 daily.0/ee-sl1/lib/modules/2.6.18-412.el5/modules.usbmap Using rsync -aHA (without X) circumvent the output but its still unclear what exactly triggers the above output. The next weekend seems to be reserved for a SElinux dive thought ... -- LF