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Bug 1991029 - SELinux is preventing /usr/sbin/lldpd from {search and create} access on the directory /var/agentx/master.
Summary: SELinux is preventing /usr/sbin/lldpd from {search and create} access on the ...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.4
Hardware: All
OS: Linux
medium
medium
Target Milestone: beta
: 8.6
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-08-06 20:19 UTC by Alena
Modified: 2022-05-10 16:22 UTC (History)
5 users (show)

Fixed In Version: selinux-policy-3.14.3-86.el8
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 2033315 (view as bug list)
Environment:
Last Closed: 2022-05-10 15:15:05 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-92784 0 None None None 2021-08-06 20:21:55 UTC
Red Hat Product Errata RHBA-2022:1995 0 None None None 2022-05-10 15:15:23 UTC

Comment 3 Milos Malik 2021-12-16 10:24:50 UTC 
The following SELinux denial appears in enforcing mode:
----
type=PROCTITLE msg=audit(12/16/2021 05:21:24.716:329) : proctitle=/usr/sbin/lldpd -x 
type=PATH msg=audit(12/16/2021 05:21:24.716:329) : item=0 name=/var/agentx/master nametype=UNKNOWN cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(12/16/2021 05:21:24.716:329) : cwd=/ 
type=SOCKADDR msg=audit(12/16/2021 05:21:24.716:329) : saddr={ saddr_fam=local path=/var/agentx/master } 
type=SYSCALL msg=audit(12/16/2021 05:21:24.716:329) : arch=x86_64 syscall=connect success=no exit=EACCES(Permission denied) a0=0x7 a1=0x55dff95e3980 a2=0x6e a3=0x0 items=1 ppid=1 pid=5978 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=lldpd exe=/usr/sbin/lldpd subj=system_u:system_r:lldpad_t:s0 key=(null) 
type=AVC msg=audit(12/16/2021 05:21:24.716:329) : avc:  denied  { search } for  pid=5978 comm=lldpd name=agentx dev="vda1" ino=41943497 scontext=system_u:system_r:lldpad_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=dir permissive=0 
----

The second SELinux denial mentioned in comment#0 is already addressed in BZ#2028379.
Comment 4 Milos Malik 2021-12-16 10:27:56 UTC 
Following SELinux denials appear in permissive mode:
----
type=PROCTITLE msg=audit(12/16/2021 05:26:21.733:353) : proctitle=/usr/sbin/lldpd -x 
type=PATH msg=audit(12/16/2021 05:26:21.733:353) : item=0 name=/var/agentx/master inode=41943498 dev=fd:01 mode=socket,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:snmpd_var_lib_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(12/16/2021 05:26:21.733:353) : cwd=/ 
type=SOCKADDR msg=audit(12/16/2021 05:26:21.733:353) : saddr={ saddr_fam=local path=/var/agentx/master } 
type=SYSCALL msg=audit(12/16/2021 05:26:21.733:353) : arch=x86_64 syscall=connect success=yes exit=0 a0=0x7 a1=0x55ddf5046980 a2=0x6e a3=0x0 items=1 ppid=1 pid=6019 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=lldpd exe=/usr/sbin/lldpd subj=system_u:system_r:lldpad_t:s0 key=(null) 
type=AVC msg=audit(12/16/2021 05:26:21.733:353) : avc:  denied  { connectto } for  pid=6019 comm=lldpd path=/var/agentx/master scontext=system_u:system_r:lldpad_t:s0 tcontext=system_u:system_r:snmpd_t:s0 tclass=unix_stream_socket permissive=1 
type=AVC msg=audit(12/16/2021 05:26:21.733:353) : avc:  denied  { write } for  pid=6019 comm=lldpd name=master dev="vda1" ino=41943498 scontext=system_u:system_r:lldpad_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=sock_file permissive=1 
type=AVC msg=audit(12/16/2021 05:26:21.733:353) : avc:  denied  { search } for  pid=6019 comm=lldpd name=agentx dev="vda1" ino=41943497 scontext=system_u:system_r:lldpad_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=dir permissive=1 
----

# rpm -qa selinux\*
selinux-policy-3.14.3-85.el8.noarch
selinux-policy-targeted-3.14.3-85.el8.noarch
#
Comment 6 Zdenek Pytela 2022-01-03 11:38:00 UTC 
I've submitted a Fedora PR to address the issue:
https://github.com/fedora-selinux/selinux-policy/pull/982
Comment 7 Zdenek Pytela 2022-01-03 14:13:00 UTC 
To backport:
commit e7f00c5591082ab84c055ba250b361eefa19eb0d (HEAD -> rawhide, upstream/rawhide)
Author: Zdenek Pytela <zpytela>
Date:   Mon Jan 3 12:27:28 2022 +0100

    Allow lldpd connect to snmpd with a unix domain stream socket
Comment 8 Zdenek Pytela 2022-01-03 14:37:29 UTC 
https://gitlab.cee.redhat.com/SELinux/selinux-policy/-/commit/1d86c82abf7dfb9d30a00ceefc50a5040b468c87?merge_request_iid=405
commit 1d86c82abf7dfb9d30a00ceefc50a5040b468c87 (HEAD -> rhel8.6-contrib, upstream/rhel8.6-contrib, origin/rhel8.6-contrib)
Author: Zdenek Pytela <zpytela>
Date:   Mon Jan 3 12:27:28 2022 +0100

    Allow lldpd connect to snmpd with a unix domain stream socket

    If the lldpd service is configured to enable the SNMP subagent
    (using the -x option), the lldpd process tries to connect to snmpd's
    agentx. By default, the /var/agentx/master socket file is used.

    Addresses the following AVC denial:

    type=PROCTITLE msg=audit(01/03/22 06:21:57.359:417) : proctitle=/usr/sbin/lldpd -x
    type=PATH msg=audit(01/03/22 06:21:57.359:417) : item=0 name=/var/agentx/master nametype=UNKNOWN cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0
    type=CWD msg=audit(01/03/22 06:21:57.359:417) : cwd=/
    type=SOCKADDR msg=audit(01/03/22 06:21:57.359:417) : saddr={ saddr_fam=local path=/var/agentx/master }
    type=SYSCALL msg=audit(01/03/22 06:21:57.359:417) : arch=x86_64 syscall=connect success=no exit=EACCES(Permission denied) a0=0x6 a1=0x5586e8de9980 a2=0x6e a3=0x0 items=1 ppid=1 pid=12595 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=lldpd exe=/usr/sbin/lldpd subj=system_u:system_r:lldpad_t:s0 key=(null)
    type=AVC msg=audit(01/03/22 06:21:57.359:417) : avc:  denied  { search } for  pid=12595 comm=lldpd name=agentx dev="vda1" ino=2034987 scontext=system_u:system_r:lldpad_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=dir permissive=0
    
    Resolves: rhbz#1991029
Comment 16 errata-xmlrpc 2022-05-10 15:15:05 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 (selinux-policy bug fix and enhancement update), 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-2022:1995
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