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Bug 2209973 - SELinux prevents nsd-* tools (executed by crond) from writing into /run/nsd/nsd.ctl socket
Summary: SELinux prevents nsd-* tools (executed by crond) from writing into /run/nsd/n...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: selinux-policy
Version: 9.3
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Nobody
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-05-25 11:39 UTC by Milos Malik
Modified: 2023-11-07 11:22 UTC (History)
3 users (show)

Fixed In Version: selinux-policy-38.1.16-1.el9
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-11-07 08:52:24 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-158174 0 None None None 2023-05-25 11:42:38 UTC
Red Hat Product Errata RHBA-2023:6617 0 None None None 2023-11-07 08:52:37 UTC

Description Milos Malik 2023-05-25 11:39:38 UTC 
Description of problem: the following message appears in the systemd journal when any nsd-* program is executed as a cronjob.

CROND[23753]: (root) CMDOUT (error: connect (/run/nsd/nsd.ctl): Permission denied)

# matchpathcon /usr/sbin/nsd-*
/usr/sbin/nsd-checkconf	system_u:object_r:nsd_exec_t:s0
/usr/sbin/nsd-checkzone	system_u:object_r:nsd_exec_t:s0
/usr/sbin/nsd-control	system_u:object_r:nsd_exec_t:s0
/usr/sbin/nsd-control-setup	system_u:object_r:nsd_exec_t:s0
# sesearch -c process -T | grep 'cron.*nsd_crond_t'
type_transition crond_t nsd_exec_t:process nsd_crond_t;
type_transition system_cronjob_t nsd_exec_t:process nsd_crond_t;
#

Version-Release number of selected component (if applicable):
nsd-4.3.9-3.el9.x86_64
selinux-policy-38.1.12-1.el9.noarch
selinux-policy-targeted-38.1.12-1.el9.noarch

How reproducible:
 * always

Steps to Reproduce:
1. get a RHEL-9.3 machine (targeted policy is active)
2. start the nsd service
3. add the following line into /etc/crontab file
* * * * * nsd /usr/sbin/nsd-control status
4. restart the crond service
5. wait at least 1 minute
6. search for SELinux denials

Actual results (enforcing mode):
----
type=PROCTITLE msg=audit(05/25/2023 07:23:01.953:1237) : proctitle=/usr/sbin/nsd-control status 
type=PATH msg=audit(05/25/2023 07:23:01.953:1237) : item=0 name=/run/nsd/nsd.ctl inode=1153 dev=00:18 mode=socket,755 ouid=nsd ogid=nsd rdev=00:00 obj=system_u:object_r:nsd_var_run_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(05/25/2023 07:23:01.953:1237) : cwd=/etc/nsd 
type=SOCKADDR msg=audit(05/25/2023 07:23:01.953:1237) : saddr={ saddr_fam=local path=/run/nsd/nsd.ctl } 
type=SYSCALL msg=audit(05/25/2023 07:23:01.953:1237) : arch=x86_64 syscall=connect success=no exit=EACCES(Permission denied) a0=0x3 a1=0x7ffc3b2cfdc0 a2=0x6e a3=0xfffffffffffffffc items=1 ppid=24462 pid=24474 auid=nsd uid=nsd gid=nsd euid=nsd suid=nsd fsuid=nsd egid=nsd sgid=nsd fsgid=nsd tty=(none) ses=96 comm=nsd-control exe=/usr/sbin/nsd-control subj=system_u:system_r:nsd_crond_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(05/25/2023 07:23:01.953:1237) : avc:  denied  { write } for  pid=24474 comm=nsd-control name=nsd.ctl dev="tmpfs" ino=1153 scontext=system_u:system_r:nsd_crond_t:s0-s0:c0.c1023 tcontext=system_u:object_r:nsd_var_run_t:s0 tclass=sock_file permissive=0 
----

Expected results:
 * no SELinux denials

Additional info:
 * the nsd package comes from EPEL
Comment 1 Milos Malik 2023-05-25 11:41:14 UTC 
Actual results (permissive mode):
----
type=PROCTITLE msg=audit(05/25/2023 07:24:02.055:1255) : proctitle=/usr/sbin/nsd-control status 
type=PATH msg=audit(05/25/2023 07:24:02.055:1255) : item=0 name=/run/nsd/nsd.ctl inode=1153 dev=00:18 mode=socket,755 ouid=nsd ogid=nsd rdev=00:00 obj=system_u:object_r:nsd_var_run_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(05/25/2023 07:24:02.055:1255) : cwd=/etc/nsd 
type=SOCKADDR msg=audit(05/25/2023 07:24:02.055:1255) : saddr={ saddr_fam=local path=/run/nsd/nsd.ctl } 
type=SYSCALL msg=audit(05/25/2023 07:24:02.055:1255) : arch=x86_64 syscall=connect success=yes exit=0 a0=0x3 a1=0x7ffd11510880 a2=0x6e a3=0xfffffffffffffffc items=1 ppid=24479 pid=24491 auid=nsd uid=nsd gid=nsd euid=nsd suid=nsd fsuid=nsd egid=nsd sgid=nsd fsgid=nsd tty=(none) ses=98 comm=nsd-control exe=/usr/sbin/nsd-control subj=system_u:system_r:nsd_crond_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(05/25/2023 07:24:02.055:1255) : avc:  denied  { connectto } for  pid=24491 comm=nsd-control path=/run/nsd/nsd.ctl scontext=system_u:system_r:nsd_crond_t:s0-s0:c0.c1023 tcontext=system_u:system_r:nsd_t:s0 tclass=unix_stream_socket permissive=1 
type=AVC msg=audit(05/25/2023 07:24:02.055:1255) : avc:  denied  { write } for  pid=24491 comm=nsd-control name=nsd.ctl dev="tmpfs" ino=1153 scontext=system_u:system_r:nsd_crond_t:s0-s0:c0.c1023 tcontext=system_u:object_r:nsd_var_run_t:s0 tclass=sock_file permissive=1 
----
Comment 4 Nikola Knazekova 2023-06-14 14:59:41 UTC 
PR: https://github.com/fedora-selinux/selinux-policy/pull/1742
Comment 18 errata-xmlrpc 2023-11-07 08:52:24 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-2023:6617
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