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Bug 602624 - SELinux policy for dhcpc needs permissions to run resolvconf from scripts
Summary: SELinux policy for dhcpc needs permissions to run resolvconf from scripts
Status: RESOLVED FIXED
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: SELinux (show other bugs)
Hardware: All Linux
: Normal normal
Assignee: Jason Zaman
URL:
Whiteboard: sec-policy r4
Keywords:
Depends on:
Blocks:
 
Reported: 2016-12-14 10:31 UTC by Robert Sharp
Modified: 2017-04-10 18:21 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


Attachments
AVCs for resolvconf (resolvconf_avcs.log,2.91 KB, text/x-log)
2016-12-14 10:31 UTC, Robert Sharp
Details

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Description Robert Sharp 2016-12-14 10:31:35 UTC
Created attachment 456168 [details]
AVCs for resolvconf

The policy covering dhcp clients is defined in system/sysnetwork.te and covers the case were the client runs resolvconf (net-dns/openresolv) from within its own domain (dhcpc_t). However, it appears that net-misc/dhcpcd runs resolvconf from the dhcpc_script_t domain, which is not anticipated in the policy and as a result it does not transition to an accepted domain:

type=AVC msg=audit(1480827246.554:34865): avc:  denied  { open } for  pid=16908 comm="resolvconf" path="/proc/meminfo" dev="proc" ino=4026531989 scontext=system_u:system_r:resolvconf_t tcontext=system_u:object_r:proc_t tclass=file permissive=1


A list of the resolvconf AVCs generated is attached. Unfortunately, this does not include the AVCs from dhcpc direct, but hopefully it is enough.

The problem can be fixed by including the following in sysnetwork.te, which is already included for the dhcpc_t domain:

> optional_policy(`
>        resolvconf_client_domain(dhcpc_script_t)
>    ')

With this change, dhcpcd runs without raising any AVCs.
Comment 1 Jason Zaman gentoo-dev 2017-01-23 18:19:58 UTC
in master now.
Comment 2 Jason Zaman gentoo-dev 2017-01-26 18:04:32 UTC
-r4 is in ~arch
Comment 3 Sven Vermeulen (RETIRED) gentoo-dev 2017-04-10 18:20:41 UTC
The 2.20170204-r2 release is now stable (which includes the 2.20161023-r4 changes).