Bug 1376991

Summary: unix_chkpwd is missing dac_read_search capability
Product: Red Hat Enterprise Linux 7 Reporter: Ondrej Moriš <omoris>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.3CC: lvrabec, mgrepl, mmalik, omoris, plautrba, pvrabec, sbroz, ssekidde, tmraz
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: selinux-policy-3.13.1-175.el7 Doc Type: If docs needed, set a value
Doc Text:
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Clone Of: Environment:
Last Closed: 2018-04-10 12:24:04 UTC Type: Bug
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Ondrej Moriš 2016-09-17 10:26:36 UTC 
Description of problem:

PAM authentication in libreswan (via xauth) fails in pam_unix pluto PAM stack due to missing dac_read_search capability for unix_chkpwd.

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

selinux-policy-3.13.1-97.el7
libreswan-3.15-8.el7

How reproducible:

100%

Steps to Reproduce:

Configure xauthby=pam for libreswan and bring up the connection, for detailed steps please see RHBZ#1278063#c5.

Actual results:

Connection does not work, authentication failure.

# ausearch -ts 12:06:56 -m avc -sv no
----
time->Sat Sep 17 12:06:56 2016
type=PATH msg=audit(1474106816.540:2362): item=0 name="/etc/shadow" inode=67668197 dev=fd:00 mode=0100000 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:shadow_t:s0 objtype=NORMAL
type=CWD msg=audit(1474106816.540:2362):  cwd="/run/pluto"
type=SYSCALL msg=audit(1474106816.540:2362): arch=c000003e syscall=2 success=no exit=-13 a0=7fb186b7c453 a1=80000 a2=1b6 a3=24 items=1 ppid=23533 pid=23668 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="unix_chkpwd" exe="/usr/sbin/unix_chkpwd" subj=system_u:system_r:chkpwd_t:s0 key=(null)
type=AVC msg=audit(1474106816.540:2362): avc:  denied  { dac_read_search } for  pid=23668 comm="unix_chkpwd" capability=2  scontext=system_u:system_r:chkpwd_t:s0 tcontext=system_u:system_r:chkpwd_t:s0 tclass=capability

# ausearch -ts 12:06:56 -m avc -sv no | audit2allow 

#============= chkpwd_t ==============
allow chkpwd_t self:capability dac_read_search;

Expected results:

Successful authentication.

Additional info:

Please see RHBZ#1278063 for more details.
Comment 3 Lukas Vrabec 2016-09-19 10:22:49 UTC 
Thank you guys for info, moving to RHEL-7.4
Comment 9 errata-xmlrpc 2018-04-10 12:24:04 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