Adding local nodecon's through semanage

[Christian Kuester <c.kuester@tarent.de>]

Hi List,

I had a small conversation with Stephen Smalley on the
fedora-selinux-list about an easy way to add
(local) nodecon's on a SELinux enabled system. As this is not
implemented in semanage yet
he gave me the advice to revive a discussion[1] on this list from 2006.
It began because a patch against
semanage was posted which enabled nodecon support. It seems that the
patch never got commited
because it didn't work as expected.

I writing because I would like to know if there's any chance to get that
fully working. I played around
with the patch and I could set labels to nodes and my SELinux seems to
respect these settings.
f.i
# semanage node -t blacknetwork_node_t -a -p 0 -M 255.255.255.255
192.168.100.54
$ ./socat -u TCP4-LISTEN:5555,bind=192.168.100.54,reuseaddr,fork -
...
type=AVC msg=audit(1215085777.002:689775728): avc:  denied  { node_bind
} for  pid=26627 comm="socat" saddr=192.168.100.54 src=5555
scontext=user_u:user_r:exe_t:s0
tcontext=system_u:object_r:blacknetwork_node_t:s0 tclass=tcp_socket

So, this seems to work. But I run into problems when I told semanage
about the
*actual* netmask of this node, which is 255.255.255.0. The tcontext
string switched from
"blacknetwork_node_t" to the generic "node_t".

Kind regards,
Chris

[1] http://www.nsa.gov/selinux/list-archive/0609/16754.cfm




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