Bug 234885 - [LSPP] aide policy causes denials
[LSPP] aide policy causes denials
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: selinux-policy (Show other bugs)
5.0
All Linux
medium Severity high
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Assigned To: Daniel Walsh
:
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2007-04-02 14:56 EDT by George C. Wilson
Modified: 2010-10-22 10:09 EDT (History)
3 users (show)

See Also:
Fixed In Version: RHBA-2007-0544
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Environment:
Last Closed: 2007-11-07 11:38:45 EST
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


Attachments (Terms of Use)
Additional aide policy (1.06 KB, text/plain)
2007-04-02 14:56 EDT, George C. Wilson
no flags Details

  None (edit)
Description George C. Wilson 2007-04-02 14:56:54 EDT
Description of problem:

The current mls policy for aide does not work. The utility fails with AVC denial
records in the audit trail.

Version-Release number of selected component (if applicable):

RHEL5 + LSPP packages - following are the relevant ones:
aide-0.12-8.el5
kernel-2.6.18-8.1.1.lspp.72.el5
selinux-policy-2.4.6-49.el5

How reproducible:

Reproducible by running logging as as root/sysadm_r/SystemHigh and running aide.

Steps to Reproduce:

aide must be executed by a SystemHigh subject so that it can read all the
system files and write to its database and log.

The aide file contexts consist of these entries:

[root/sysadm_r/SystemHigh@hvracer4 ~]# semanage fcontext --list | grep aide
/var/log/aide.log                                  regular file
system_u:object_r:aide_log_t:s15:c0.c1023
/var/lib/aide(/.*)                                 all files
system_u:object_r:aide_db_t:s15:c0.c1023
/usr/sbin/aide                                     regular file
system_u:object_r:aide_exec_t:s15:c0.c1023

/var/log/aide.log and /usr/sbin/aide receive correct labels:

[root/sysadm_r/SystemHigh@hvracer4 ~]# touch /var/log/aide.log
[root/sysadm_r/SystemHigh@hvracer4 ~]# ls -Z /var/log/aide.log
-rw-r--r--  root root root:object_r:var_log_t:SystemHigh /var/log/aide.log
[root/sysadm_r/SystemHigh@hvracer4 ~]# ls -Z /usr/sbin/aide
-rwx------  root root system_u:object_r:aide_exec_t:SystemHigh /usr/sbin/aide

But /var/lib/aide is incorrectly labeled:

[root/sysadm_r/SystemHigh@hvracer4 ~]# ls -dZ /var/lib/aide
drwx------  root root system_u:object_r:var_lib_t:SystemLow /var/lib/aide

restorecon does not help:

[root/sysadm_r/SystemHigh@hvracer4 ~]# restorecon /var/lib/aide
[root/sysadm_r/SystemHigh@hvracer4 ~]# ls -dZ /var/lib/aide
drwx------  root root system_u:object_r:var_lib_t:SystemLow /var/lib/aide

chcon does:

[root/sysadm_r/SystemHigh@hvracer4 ~]# chcon
system_u:object_r:aide_db_t:s15:c0.c1023 /var/lib/aide
[root/sysadm_r/SystemHigh@hvracer4 ~]# ls -dZ /var/lib/aide
drwx------  root root system_u:object_r:aide_db_t:SystemHigh /var/lib/aide

When aide runs, it produces with lstat() failures:

. . .
lstat() failed for /sbin/rdump:Permission denied
lstat() failed for /sbin/scsi_id:Permission denied
lstat() failed for /sbin/rrestore.static:Permission denied

These are caused by TE denials:

. . .
type=AVC msg=audit(1175519552.714:2134): avc:  denied  { getattr } for
pid=7100 comm="aide" name="rdump" dev=dm-0 ino=196671
scontext=root:sysadm_r:aide_t:s15:c0.c1023
tcontext=system_u:object_r:sbin_t:s0 tclass=lnk_file
type=SYSCALL msg=audit(1175519552.714:2134): arch=14 syscall=196 success=no
exit=-13 a0=107976f8 a1=fb99f910 a2=fb99f910 a3=40205bbc items=0 ppid=7051
pid=7100 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0
tty=hvc0 comm="aide" exe="/usr/sbin/aide"
subj=root:sysadm_r:aide_t:s15:c0.c1023 key=(null)
type=AVC_PATH msg=audit(1175519552.714:2134):  path="/sbin/rdump"
type=AVC msg=audit(1175519552.715:2135): avc:  denied  { getattr } for
pid=7100 comm="aide" name="scsi_id" dev=dm-0 ino=196803
scontext=root:sysadm_r:aide_t:s15:c0.c1023
tcontext=system_u:object_r:sbin_t:s0 tclass=lnk_file
type=SYSCALL msg=audit(1175519552.715:2135): arch=14 syscall=196 success=no
exit=-13 a0=10797710 a1=fb99f910 a2=fb99f910 a3=40205bbc items=0 ppid=7051
pid=7100 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0
tty=hvc0 comm="aide" exe="/usr/sbin/aide"
subj=root:sysadm_r:aide_t:s15:c0.c1023 key=(null)
type=AVC_PATH msg=audit(1175519552.715:2135):  path="/sbin/scsi_id"
type=AVC msg=audit(1175519552.723:2136): avc:  denied  { getattr } for
pid=7100 comm="aide" name="rrestore.static" dev=dm-0 ino=196676
scontext=root:sysadm_r:aide_t:s15:c0.c1023
tcontext=system_u:object_r:sbin_t:s0 tclass=lnk_file
type=SYSCALL msg=audit(1175519552.723:2136): arch=14 syscall=196 success=no
exit=-13 a0=107973a0 a1=fb99f910 a2=fb99f910 a3=40205bbc items=0 ppid=7051
pid=7100 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0
tty=hvc0 comm="aide" exe="/usr/sbin/aide"
subj=root:sysadm_r:aide_t:s15:c0.c1023 key=(null)
type=AVC_PATH msg=audit(1175519552.723:2136):  path="/sbin/rrestore.static"

Actual results:

aide fails with denials.

Expected results:

aide succeeds.

Additional info:

I generated the attached policy module, which allows aide to succeed. It appears
that the exiting aide module should cover some of the cases but doesn't.  I also
thought the domain_getattr_all_domains(aide_t) should allow aide to getattr but
had to add explicit allow rules. Note that /var/lib/aide must be chcon'd by
hand. I think that is precedence issue.
Comment 1 George C. Wilson 2007-04-02 14:56:54 EDT
Created attachment 151456 [details]
Additional aide policy
Comment 2 Daniel Walsh 2007-04-02 15:40:17 EDT
Fixed file context for /var/lib/aide

I am adding 

files_read_all_symlinks(aide_t)
domain_getattr_all_domains(aide_t)
allow aide_t aide_log_t:file write;

FIxed in selinux-policy-2.4.6-50
Comment 3 RHEL Product and Program Management 2007-04-02 16:40:40 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.
Comment 8 errata-xmlrpc 2007-11-07 11:38:45 EST
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2007-0544.html

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