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Bug 1428568 - AVC denials for ldap-agent from 389-ds-base-snmp
Summary: AVC denials for ldap-agent from 389-ds-base-snmp
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.3
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-03-02 20:41 UTC by Viktor Ashirov
Modified: 2018-04-10 12:29 UTC (History)
9 users (show)

Fixed In Version: selinux-policy-3.13.1-189.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-04-10 12:28:17 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:0763 0 None None None 2018-04-10 12:29:13 UTC

Description Viktor Ashirov 2017-03-02 20:41:57 UTC 
Description of problem:
ldap-agent from 389-ds-base-snmp can't be executed because of denials.

Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-123.el7.noarch
389-ds-base-snmp-1.3.5.10-18.el7_3.x86_64

How reproducible:
always

Steps to Reproduce:
1. Install 389-ds-base-snmp
2. semodule --disable_dontaudit --build
3. ldap-agent

Actual results:
# ldap-agent
(no output is produced)

# ausearch -m AVC
----
time->Thu Mar  2 15:38:40 2017
type=SYSCALL msg=audit(1488487120.219:295): arch=c000003e syscall=59 success=yes exit=0 a0=17c66d0 a1=17c62a0 a2=17c33c0 a3=7fff2e8b96f0 items=0 ppid=14385 pid=14386 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4 comm="ldap-agent-bin" exe="/usr/sbin/ldap-agent-bin" subj=unconfined_u:system_r:dirsrv_snmp_t:s0 key=(null)
type=AVC msg=audit(1488487120.219:295): avc:  denied  { read append } for  pid=14386 comm="ldap-agent-bin" path="/dev/pts/0" dev="devpts" ino=3 scontext=unconfined_u:system_r:dirsrv_snmp_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file
type=AVC msg=audit(1488487120.219:295): avc:  denied  { read append } for  pid=14386 comm="ldap-agent-bin" path="/dev/pts/0" dev="devpts" ino=3 scontext=unconfined_u:system_r:dirsrv_snmp_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file
type=AVC msg=audit(1488487120.219:295): avc:  denied  { read append } for  pid=14386 comm="ldap-agent-bin" path="/dev/pts/0" dev="devpts" ino=3 scontext=unconfined_u:system_r:dirsrv_snmp_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file
type=AVC msg=audit(1488487120.219:295): avc:  denied  { read write } for  pid=14386 comm="ldap-agent-bin" path="/dev/pts/0" dev="devpts" ino=3 scontext=unconfined_u:system_r:dirsrv_snmp_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file


Expected results:
# ldap-agent
Usage: ldap-agent [-D] configfile
       -D    Enable debug logging


Additional info:
Comment 2 Milos Malik 2017-03-03 06:45:26 UTC 
Following SELinux denials appear in permissive mode after disabling dontaudit rules:
----
type=PATH msg=audit(03/03/2017 01:40:58.273:295) : item=1 name=/lib64/ld-linux-x86-64.so.2 inode=9646 dev=fd:01 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:ld_so_t:s0 objtype=NORMAL 
type=PATH msg=audit(03/03/2017 01:40:58.273:295) : item=0 name=/usr/sbin/ldap-agent-bin inode=23130 dev=fd:01 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:dirsrv_snmp_exec_t:s0 objtype=NORMAL 
type=CWD msg=audit(03/03/2017 01:40:58.273:295) :  cwd=/root 
type=EXECVE msg=audit(03/03/2017 01:40:58.273:295) : argc=1 a0=/usr/sbin/ldap-agent-bin 
type=SYSCALL msg=audit(03/03/2017 01:40:58.273:295) : arch=x86_64 syscall=execve success=yes exit=0 a0=0x226f3b0 a1=0x226efa0 a2=0x226c030 a3=0x7ffebb4b4af0 items=2 ppid=1484 pid=1485 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=3 comm=ldap-agent-bin exe=/usr/sbin/ldap-agent-bin subj=unconfined_u:system_r:dirsrv_snmp_t:s0 key=(null) 
type=AVC msg=audit(03/03/2017 01:40:58.273:295) : avc:  denied  { append } for  pid=1485 comm=ldap-agent-bin path=/dev/pts/0 dev="devpts" ino=3 scontext=unconfined_u:system_r:dirsrv_snmp_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file 
type=AVC msg=audit(03/03/2017 01:40:58.273:295) : avc:  denied  { read write } for  pid=1485 comm=ldap-agent-bin path=/dev/pts/0 dev="devpts" ino=3 scontext=unconfined_u:system_r:dirsrv_snmp_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file 
----
type=SYSCALL msg=audit(03/03/2017 01:40:58.278:296) : arch=x86_64 syscall=fstat success=yes exit=0 a0=0x1 a1=0x7ffe65725a90 a2=0x7ffe65725a90 a3=0x7ffe65725a50 items=0 ppid=1484 pid=1485 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=3 comm=ldap-agent-bin exe=/usr/sbin/ldap-agent-bin subj=unconfined_u:system_r:dirsrv_snmp_t:s0 key=(null) 
type=AVC msg=audit(03/03/2017 01:40:58.278:296) : avc:  denied  { getattr } for  pid=1485 comm=ldap-agent-bin path=/dev/pts/0 dev="devpts" ino=3 scontext=unconfined_u:system_r:dirsrv_snmp_t:s0 tcontext=unconfined_u:object_r:user_devpts_t:s0 tclass=chr_file 
----

In permissive mode the output contains what's expected:
# ldap-agent
Usage: ldap-agent [-D] configfile
       -D    Enable debug logging
#
Comment 8 Milos Malik 2018-02-06 16:29:48 UTC 
# matchpathcon /usr/sbin/ldap-agent 
/usr/sbin/ldap-agent	system_u:object_r:initrc_exec_t:s0
# matchpathcon /usr/sbin/ldap-agent-bin
/usr/sbin/ldap-agent-bin	system_u:object_r:dirsrv_snmp_exec_t:s0
# ls -l /usr/sbin/ldap-agent
-rwxr-xr-x. 1 root root 32600 Jan 26 10:16 /usr/sbin/ldap-agent
# ls -l /usr/sbin/ldap-agent-bin
ls: cannot access /usr/sbin/ldap-agent-bin: No such file or directory
# 

Is it expected that ldap-agent-bin is missing? yum and repoquery do not help.
Comment 11 Milos Malik 2018-02-07 07:50:43 UTC 
# matchpathcon /usr/sbin/ldap-agent 
/usr/sbin/ldap-agent	system_u:object_r:initrc_exec_t:s0
# ls -l /usr/sbin/ldap-agent
-rwxr-xr-x. 1 root root 32600 Jan 26 10:16 /usr/sbin/ldap-agent
# matchpathcon /usr/sbin/ldap-agent-bin
/usr/sbin/ldap-agent-bin	system_u:object_r:dirsrv_snmp_exec_t:s0
# ls -l /usr/sbin/ldap-agent-bin
ls: cannot access /usr/sbin/ldap-agent-bin: No such file or directory
# 

The fact that wrappers were removed and binaries were renamed means that file context pattern in selinux-policy needs to be improved. With the latest selinux-policy installed the ldap-agent process runs as initrc_t (output from the automated TC proves it) , but it should run as dirsrv_snmp_t.

:: [ 02:48:26 ] :: [  BEGIN   ] :: Running 'service dirsrv-snmp start'
Redirecting to /bin/systemctl start dirsrv-snmp.service
:: [ 02:48:31 ] :: [   PASS   ] :: Command 'service dirsrv-snmp start' (Expected 0, got 0)
:: [ 02:48:32 ] :: [  BEGIN   ] :: Running 'ps -efZ | grep -v " grep " | grep -E "ldap-agent"'
system_u:system_r:initrc_t:s0   root     22523     1  0 02:48 ?        00:00:00 /usr/sbin/ldap-agent /etc/dirsrv/config/ldap-agent.conf
:: [ 02:48:32 ] :: [   PASS   ] :: Command 'ps -efZ | grep -v " grep " | grep -E "ldap-agent"' (Expected 0, got 0)
:: [ 02:48:32 ] :: [  BEGIN   ] :: Running 'ps -efZ | grep -v " grep " | grep -E "dirsrv_snmp_t.*ldap-agent"'
:: [ 02:48:32 ] :: [   FAIL   ] :: Command 'ps -efZ | grep -v " grep " | grep -E "dirsrv_snmp_t.*ldap-agent"' (Expected 0, got 1)
:: [ 02:48:33 ] :: [  BEGIN   ] :: Running 'service dirsrv-snmp status'
Redirecting to /bin/systemctl status dirsrv-snmp.service
● dirsrv-snmp.service - 389 Directory Server SNMP Subagent.
   Loaded: loaded (/usr/lib/systemd/system/dirsrv-snmp.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2018-02-07 02:48:31 EST; 2s ago
  Process: 22521 ExecStart=/usr/sbin/ldap-agent /etc/dirsrv/config/ldap-agent.conf (code=exited, status=0/SUCCESS)
 Main PID: 22523 (ldap-agent)
   CGroup: /system.slice/dirsrv-snmp.service
           └─22523 /usr/sbin/ldap-agent /etc/dirsrv/config/ldap-agent.conf

Feb 07 02:48:26 qeos-17.lab.eng.rdu2.redhat.com systemd[1]: Starting 389 Dire...
Feb 07 02:48:31 qeos-17.lab.eng.rdu2.redhat.com ldap-agent[22521]: ldap-agent...
Feb 07 02:48:31 qeos-17.lab.eng.rdu2.redhat.com systemd[1]: Started 389 Direc...
Hint: Some lines were ellipsized, use -l to show in full.
:: [ 02:48:33 ] :: [   PASS   ] :: Command 'service dirsrv-snmp status' (Expected 0,1,3, got 0)
Comment 17 errata-xmlrpc 2018-04-10 12:28:17 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://access.redhat.com/errata/RHBA-2018:0763
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