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Bug 1535133

Summary: selinux denies ipsec service to read configuration in mls policy
Product: Red Hat Enterprise Linux 7 Reporter: Ondrej Moriš <omoris>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Ondrej Moriš <omoris>
Severity: high Docs Contact:
Priority: high    
Version: 7.5CC: lmiksik, lvrabec, mgrepl, mmalik, omoris, plautrba, ssekidde
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: selinux-policy-3.13.1-186.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2018-04-10 12:49:36 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Ondrej Moriš 2018-01-16 16:57:19 UTC 
Description of problem:

Selinux denies ipsec service to read its configuration when MLS selinux-policy is used. It denies read access to /etc/ipsec.d/ configuration directory (system_u:object_r:ipsec_key_file_t:SystemLow):

time->Tue Jan 16 17:48:37 2018
type=PROCTITLE msg=audit(1516121317.268:53607): proctitle=2F7573722F6C6962657865632F69707365632F616464636F6E6E002D2D636F6E666967002F6574632F69707365632E636F6E66002D2D636865636B636F6E666967
type=SYSCALL msg=audit(1516121317.268:53607): arch=c000003e syscall=257 success=yes exit=4 a0=ffffffffffffff9c a1=7fff40c2f110 a2=90800 a3=0 items=0 ppid=1 pid=4487 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="addconn" exe="/usr/libexec/ipsec/addconn" subj=system_u:system_r:init_t:s0-s15:c0.c1023 key=(null)
type=AVC msg=audit(1516121317.268:53607): avc:  denied  { read } for  pid=4487 comm="addconn" name="ipsec.d" dev="dm-0" ino=26031489 scontext=system_u:system_r:init_t:s0-s15:c0.c1023 tcontext=system_u:object_r:ipsec_key_file_t:s0 tclass=dir

as well as read, open, ioctl and getattr access to files in this directory.

The following rules solved all issues:

allow init_t ipsec_key_file_t:dir read;
allow init_t ipsec_key_file_t:file read;
allow init_t ipsec_key_file_t:file ioctl;
allow init_t ipsec_key_file_t:file open;
allow init_t ipsec_key_file_t:file getattr;

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

selinux-policy-mls-3.13.1-183.el7
kernel-3.10.0-823.el7
audit-2.8.1-3.el7
libreswan-3.22-5.el7

How reproducible:

100% in MLS

Steps to Reproduce:

1. Use default libreswan configuration.
2. Start ipsec service 

Actual results:

AVC, access to configuration denied:

ipsec_starter[4794]: warning: could not open include filename: '/etc/ipsec.d/audit-test-*.conf'

Expected results:

Configuration can be read and loaded, ipsec service starts successfully.

Additional info:

This seems to be a regression when compared to RHEL-7.4. This issue is reproducible in MLS policy only! Found during Common Criteria retention testing.
Comment 2 Milos Malik 2018-01-17 07:17:34 UTC 
The /etc/ipsec.d/audit-test-*.conf files are labeled ipsec_key_file_t, which is not optimal. Does the scenario work if you label the /etc/ipsec.d/audit-test-*.conf files with ipsec_conf_file_t?
Comment 3 Milos Malik 2018-01-17 07:31:02 UTC 
Following rule is missing and the advice mentioned in comment#2 will not help:

allow init_t ipsec_key_file_t:dir read;

because

# matchpathcon /etc/ipsec.d
/etc/ipsec.d	system_u:object_r:ipsec_key_file_t:s0
# sesearch -s init_t -t ipsec_key_file_t -c dir -p read -A /etc/selinux/mls/policy/policy.31 

#
Comment 4 Lukas Vrabec 2018-01-17 09:19:36 UTC 
Ondrej, 

I would say, bigger issue is taht addconn runs under init_t instead of ipsec_t. 

Could you please change context of addconn to ipsec_exec_t: 

# chcon -t ipsec_exec_t /usr/libexec/ipsec/addconn

and then reproduce the scenario? 

Thanks,
Lukas.
Comment 5 Ondrej Moriš 2018-01-17 11:27:16 UTC 
Yes, with addconn having ipsec_exec_t context, it works (ie. we do not need rules mentioned in the description).
Comment 11 errata-xmlrpc 2018-04-10 12:49:36 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