Bug 834861 - SELinux is preventing xl2tpd from 'execute' accesses on the file /usr/libexec/pt_chown.
SELinux is preventing xl2tpd from 'execute' accesses on the file /usr/libexec...
Product: Fedora
Classification: Fedora
Component: xl2tpd (Show other bugs)
i686 Unspecified
unspecified Severity unspecified
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Assigned To: Paul Wouters
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-06-24 06:56 EDT by ManFree
Modified: 2012-09-18 14:44 EDT (History)
4 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2012-07-21 18:50:04 EDT
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Regression: ---
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RHEL 7.3 requirements from Atomic Host:
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Description ManFree 2012-06-24 06:56:02 EDT
libreport version: 2.0.10
executable:     /usr/bin/python2.7
hashmarkername: setroubleshoot
kernel:         3.3.4-5.fc17.i686
time:           Sun 24 Jun 2012 06:55:48 PM MSK

:SELinux is preventing xl2tpd from 'execute' accesses on the file /usr/libexec/pt_chown.
:*****  Plugin catchall (100. confidence) suggests  ***************************
:If you believe that xl2tpd should be allowed execute access on the pt_chown file by default.
:Then you should report this as a bug.
:You can generate a local policy module to allow this access.
:allow this access for now by executing:
:# grep xl2tpd /var/log/audit/audit.log | audit2allow -M mypol
:# semodule -i mypol.pp
:Additional Information:
:Source Context                system_u:system_r:l2tpd_t:s0
:Target Context                system_u:object_r:ptchown_exec_t:s0
:Target Objects                /usr/libexec/pt_chown [ file ]
:Source                        xl2tpd
:Source Path                   xl2tpd
:Port                          <Unknown>
:Host                          (removed)
:Source RPM Packages           
:Target RPM Packages           glibc-common-2.15-37.fc17.i686
:Policy RPM                    selinux-policy-3.10.0-121.fc17.noarch
:Selinux Enabled               True
:Policy Type                   targeted
:Enforcing Mode                Enforcing
:Host Name                     (removed)
:Platform                      Linux (removed) 3.3.4-5.fc17.i686 #1
:                              SMP Mon May 7 17:45:26 UTC 2012 i686 i686
:Alert Count                   2
:First Seen                    Sun 24 Jun 2012 06:49:08 PM MSK
:Last Seen                     Sun 24 Jun 2012 06:49:39 PM MSK
:Local ID                      f734c8bc-fefc-43ce-ab5d-4367137c3851
:Raw Audit Messages
:type=AVC msg=audit(1340549379.808:306): avc:  denied  { execute } for  pid=14701 comm="xl2tpd" name="pt_chown" dev="dm-1" ino=143612 scontext=system_u:system_r:l2tpd_t:s0 tcontext=system_u:object_r:ptchown_exec_t:s0 tclass=file
:Hash: xl2tpd,l2tpd_t,ptchown_exec_t,file,execute
:audit2allowunable to open /sys/fs/selinux/policy:  Permission denied
:audit2allow -Runable to open /sys/fs/selinux/policy:  Permission denied
Comment 1 Daniel Walsh 2012-06-25 16:52:37 EDT
Paul does this make sense to you?  pt_chown is only called if devpts devices are created with the wrong ownership/permissions.
Comment 2 Paul Wouters 2012-06-25 22:58:20 EDT
It's coming in through xl2tpd's pty.c:

    /* change the onwership */
    if (grantpt(fd))
        l2tp_log (LOG_WARNING, "%s: unable to grantpt() on pty\n",
        return -EINVAL;

I'm not sure why this is needed, as the pppd's run as root since there are no other system users. It does set the gid to "tty", but I don't that really matters.

I tested xl2tpd with the above code section removed, and the IPsec/L2TP tunnel worked fine. So I think this is mostly historic and can be removed.
Comment 3 ManFree 2012-06-26 00:46:42 EDT
xl2tpd and pppd works as root.
Comment 4 Daniel Walsh 2012-06-26 06:18:40 EDT
I would just make sure that pty is not too looses, IE Can a general user access the PTY.
Comment 5 Paul Wouters 2012-06-26 21:46:26 EDT
crw--w----. 1 root tty 136, 1 Jun 26 21:45 /dev/pts/1

Seems fine to me?
Comment 6 Daniel Walsh 2012-06-29 17:15:01 EDT
Then it looks good.
Comment 7 Fedora Update System 2012-07-10 17:27:48 EDT
xl2tpd-1.3.1-9.fc17 has been submitted as an update for Fedora 17.
Comment 8 Fedora Update System 2012-07-11 19:51:40 EDT
Package xl2tpd-1.3.1-9.fc17:
* should fix your issue,
* was pushed to the Fedora 17 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing xl2tpd-1.3.1-9.fc17'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).
Comment 9 Fedora Update System 2012-07-21 18:50:04 EDT
xl2tpd-1.3.1-9.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 10 Fedora Update System 2012-09-18 14:44:06 EDT
xl2tpd-1.3.1-5.el6 has been submitted as an update for Fedora EPEL 6.

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