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Bug 1263770

Summary: rsyncd getting AVC denials despite rsync_export_all_ro
Product: Red Hat Enterprise Linux 7 Reporter: Jacob Welsh <jwelsh-rhbz>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Jan Zarsky <jzarsky>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.3CC: jzarsky, lvrabec, mgrepl, mmalik, plautrba, pvrabec, ssekidde
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: selinux-policy-3.13.1-66.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-11-04 02:22:30 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:

Description Jacob Welsh 2015-09-16 16:06:44 UTC
Description of problem:
With rsyncd configured to serve "/" as read-only and the rsync_export_all_ro boolean set, it still gets denials when certain locations such as /etc/audit/ and /etc/selinux/ are accessed:

type=SYSCALL msg=audit(09/16/2015 06:06:34.568:19886) : arch=x86_64 syscall=lstat success=no exit=-13(Permission denied) a0=0x7ffd67cf3140 a1=0x7ffd67cf30b0 a2=0x7ffd67cf30b0 a3=0x0 items=0 ppid=1241 pid=20625 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rsync exe=/usr/bin/rsync subj=system_u:system_r:rsync_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(09/16/2015 06:06:34.568:19886) : avc:  denied  { getattr } for  pid=20625 comm=rsync path=/etc/selinux/targeted/policy/policy.29 dev="dm-0" ino=1342302 scontext=system_u:system_r:rsync_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:semanage_store_t:s0 tclass=file

Version-Release number of selected component (if applicable):
3.13.1-23.el7_1.13

Additional info:

"audit2allow" yields the following rules:

allow rsync_t auditd_etc_t:file getattr;
allow rsync_t default_context_t:file getattr;
allow rsync_t semanage_store_t:file getattr;
allow rsync_t semanage_store_t:lnk_file getattr;

Comment 2 Milos Malik 2015-09-17 07:17:21 UTC
Following boolean allows that kind of access, but it also allows read-write access to all files / directories on the file-system, which might be a security problem:

 * rsync_full_access

# sesearch -s rsync_t -t auditd_etc_t -c file -p getattr -A -C
Found 1 semantic av rules:
DT allow rsync_t non_auth_file_type : file { ioctl read write create getattr setattr lock append unlink link rename open } ; [ rsync_full_access ]

# sesearch -s rsync_t -t default_context_t -c file -p getattr -A -C
Found 1 semantic av rules:
DT allow rsync_t non_auth_file_type : file { ioctl read write create getattr setattr lock append unlink link rename open } ; [ rsync_full_access ]

# sesearch -s rsync_t -t semanage_store_t -c file -p getattr -A -C
Found 2 semantic av rules:
DT allow rsync_t non_auth_file_type : file { ioctl read write create getattr setattr lock append unlink link rename open } ; [ rsync_full_access ]
DT allow rsync_t semanage_store_t : file { ioctl write create getattr lock append open } ; [ rsync_full_access ]

# sesearch -s rsync_t -t semanage_store_t -c lnk_file -p getattr -A -C
Found 1 semantic av rules:
DT allow rsync_t non_auth_file_type : lnk_file { ioctl read write create getattr setattr lock append unlink link rename } ; [ rsync_full_access ]

#

Comment 4 Mike McCune 2016-03-28 22:59:28 UTC
This bug was accidentally moved from POST to MODIFIED via an error in automation, please see mmccune with any questions

Comment 8 errata-xmlrpc 2016-11-04 02:22:30 UTC
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-2016-2283.html