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selinux: make the netif cache namespace aware

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While SELinux largely ignores namespaces, for good reason, there are
some places where it needs to at least be aware of namespaces in order
to function correctly.  Network namespaces are one example.  Basic
awareness of network namespaces are necessary in order to match a
network interface's index number to an actual network device.

This patch corrects a problem with network interfaces added to a
non-init namespace, and can be reproduced with the following commands:

 [NOTE: the NetLabel configuration is here only to active the dynamic
        networking controls ]

 # netlabelctl unlbl add default address:0.0.0.0/0 \
   label:system_u:object_r:unlabeled_t:s0
 # netlabelctl unlbl add default address:::/0 \
   label:system_u:object_r:unlabeled_t:s0
 # netlabelctl cipsov4 add pass doi:100 tags:1
 # netlabelctl map add domain:lspp_test_netlabel_t \
   protocol:cipsov4,100

 # ip link add type veth
 # ip netns add myns
 # ip link set veth1 netns myns
 # ip a add dev veth0 10.250.13.100/24
 # ip netns exec myns ip a add dev veth1 10.250.13.101/24
 # ip l set veth0 up
 # ip netns exec myns ip l set veth1 up

 # ping -c 1 10.250.13.101
 # ip netns exec myns ping -c 1 10.250.13.100

Reported-by: Jiri Jaburek <jjaburek@redhat.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Paul Moore 2014-09-10 17:09:57 -04:00
parent 25db6bea1f
commit cbe0d6e879
4 changed files with 46 additions and 36 deletions
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2
security/selinux/include/objsec.h
View file

@ -24,6 +24,7 @@
#include <linux/binfmts.h>
#include <linux/in.h>
#include <linux/spinlock.h>
#include <net/net_namespace.h>
#include "flask.h"
#include "avc.h"
@ -78,6 +79,7 @@ struct ipc_security_struct {
};
struct netif_security_struct {
struct net *ns; /* network namespace */
int ifindex; /* device index */
u32 sid; /* SID for this interface */
};