836952 – selinux denies access to ldap port

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 836952 - selinux denies access to ldap port

Summary: selinux denies access to ldap port

Keywords:
Status:	CLOSED CURRENTRELEASE
Alias:	None
Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	selinux-policy
Sub Component:
Version:	7.0
Hardware:	All
OS:	Linux
Priority:	high
Severity:	high
Target Milestone:	rc
Target Release:	---
Assignee:	Miroslav Grepl
QA Contact:	Milos Malik
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2012-07-02 10:02 UTC by Karel Volný
Modified:	2014-06-18 02:13 UTC (History)
CC List:	3 users (show)
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed:	2014-06-13 12:30:12 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Description Karel Volný 2012-07-02 10:02:21 UTC

Filed from caserun https://tcms.engineering.redhat.com/run/41363/#caserun_1236707

Version-Release number of selected component (if applicable):
RHEL-7.0-20120614.n.1

Steps to Reproduce: 

/CoreOS/postgresql/Sanity/bz478839-LDAP-support



Actual results:
see https://beaker.engineering.redhat.com/jobs/255338
=> http://beaker-archive.app.eng.bos.redhat.com/beaker-logs/2012/06/2553/255338/543948/6644510/TESTOUT.log

:: [   FAIL   ] :: Trying to connect with correct user & password (Expected 0, got 2)
psql: FATAL:  LDAP authentication failed for user "user1"
:: [   FAIL   ] :: File 'psql1.out' should contain 'Copyright' 


Expected results:
PASS


Trying to authenticate user with LDAP fails on RHEL7, despite the fact that ldapsearch accepts the same username & password pair without any problem.

Note that the test passes the password to postgresql by setting the variable PGPASSWORD but this is not a source of the problem - I've tried to run the test manually forcing asking for the password and it fails in the same way.

The test works on RHEL6, see
https://beaker.engineering.redhat.com/jobs/255541

Note also that Aleš Zelinka reports similar behaviour for Samba - using tools provided by LDAP everything seems to work while samba fails.

Comment 1 Karel Volný 2012-07-12 11:14:55 UTC

I've found that the failure is caused by selinux denying access to ldap port:

type=AVC msg=audit(1342091574.420:298029): avc:  denied  { name_connect } for  pid=4463 comm="postgres" dest=389 scontext=system_u:system_r:postgresql_t:s0 tcontext=system_u:object_r:ldap_port_t:s0 tclass=tcp_socket


selinux-policy-3.10.0-137.el7.noarch

Comment 2 Miroslav Grepl 2012-07-17 06:22:35 UTC

# sesearch -A -s postgresql_t -t ldap_port_t -c tcp_socket -p name_connect -C

Found 3 semantic av rules:
DT allow postgresql_t reserved_port_type : tcp_socket name_connect ; [ allow_ypbind ]
DT allow nsswitch_domain reserved_port_type : tcp_socket name_connect ; [ allow_ypbind ]
DT allow nsswitch_domain ldap_port_t : tcp_socket { recv_msg send_msg name_connect } ; [ authlogin_nsswitch_use_ldap ]

Comment 3 Karel Volný 2012-07-19 12:04:22 UTC

(In reply to comment #2)
> # sesearch -A -s postgresql_t -t ldap_port_t -c tcp_socket -p name_connect -C
> 
> Found 3 semantic av rules:
> DT allow postgresql_t reserved_port_type : tcp_socket name_connect ; [
> allow_ypbind ]
> DT allow nsswitch_domain reserved_port_type : tcp_socket name_connect ; [
> allow_ypbind ]
> DT allow nsswitch_domain ldap_port_t : tcp_socket { recv_msg send_msg
> name_connect } ; [ authlogin_nsswitch_use_ldap ]

ok, I read that as you suggest to enable either allow_ypbind or authlogin_nsswitch_use_ldap

then this is at least docs bug, as "man ypbind_selinux" doesn't mention LDAP at all

trying to get some help for authlogin_nsswitch_use_ldap I fail completely:

[root@auto-x86-64-002 bz478839-LDAP-support]# for i in /usr/share/man/man8/*_selinux* ; do gzip -c -d $i | grep allow_ypbind && echo $i ; done
If you want to allow system to run with NI, you must turn on the allow_ypbind boolean.
.B setsebool -P allow_ypbind 1
/usr/share/man/man8/ypbind_selinux.8.gz
[root@auto-x86-64-002 bz478839-LDAP-support]# for i in /usr/share/man/man8/*_selinux* ; do gzip -c -d $i | grep authlogin_nsswitch_use_ldap && echo $i ; done
[root@auto-x86-64-002 bz478839-LDAP-support]#


also, I fail to see why "ldapsearch" is NOT denied while postgresql is? (needinfo)

Comment 4 Miroslav Grepl 2012-07-19 21:37:03 UTC

Ok, we need to fix it in

postgresql_selinux(8)

to mention the "authlogin_nsswitch_use_ldap" boolean.

Comment 5 Karel Volný 2012-07-20 10:23:31 UTC

while at it, please update also the selinux man page with references to other *_selinux manpages (e.g. postgresql_selinux not mentioned in man selinux - libselinux-utils-2.1.10-4.el7.x86_64) ... it'd be useful to highlight that you'll get specific help using 'man 8 <servicename>_selinux' than just listing all the available pages in SEE ALSO section

Comment 6 Miroslav Grepl 2012-07-23 04:50:30 UTC

(In reply to comment #5)
> while at it, please update also the selinux man page with references to
> other *_selinux manpages (e.g. postgresql_selinux not mentioned in man
> selinux - libselinux-utils-2.1.10-4.el7.x86_64) ... it'd be useful to
> highlight that you'll get specific help using 'man 8 <servicename>_selinux'
> than just listing all the available pages in SEE ALSO section

Good point.

Comment 7 Daniel Walsh 2012-10-12 19:38:36 UTC

(libselinux-2.1.12-3.el7 fixes the selinux man page .

Comment 10 Ludek Smid 2014-06-13 12:30:12 UTC

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.

Note You need to log in before you can comment on or make changes to this bug.