A cute yet small MAC policy that provides a simple ACL mechanism to

permit users and groups to bind ports for TCP or UDP, and is intended
to be combined with the recently committed support for
net.inet.ip.portrange.reservedhigh.  The policy is twiddled using
sysctl(8).  To use this module, you will need to compile in MAC
support, and probably set reservedhigh to 0, then twiddle
security.mac.portacl.rules to set things as desired.  This policy
module only restricts ports explicitly bound using bind(), not
implicitly bound ports where the port number is selected by the
IP stack.  It appears to work properly in my local configuration,
but needs more broad testing.

A sample policy might be:

  # sysctl security.mac.portacl.rules="uid:425:tcp:80,uid:425:tcp:79"

This permits uid 425 to bind TCP sockets to ports 79 and 80.  Currently
no distinction is made for incoming vs. outgoing ports with TCP,
although that would probably be easy to add.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/conf/options b/sys/conf/options
index 854d85b9722f..e097828b9336 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -159,6 +159,7 @@ MAC_LOMAC	opt_dontuse.h
 MAC_MLS		opt_dontuse.h
 MAC_NONE	opt_dontuse.h
 MAC_PARTITION	opt_dontuse.h
+MAC_PORTACL	opt_dontuse.h
 MAC_SEEOTHERUIDS	opt_dontuse.h
 MAC_TEST	opt_dontuse.h