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MAC_PORTACL(4) BSD Kernel Interfaces Manual MAC_PORTACL(4) NAME mac_portacl -- network port access control policy SYNOPSIS To compile the port access control policy into your kernel, place the following lines in your kernel configuration file: options MAC options MAC_PORTACL Alternately, to load the port access control policy module at boot time, place the following line in your kernel configuration file: options MAC and in loader.conf(5): mac_portacl_load="YES" DESCRIPTION The mac_portacl policy allows administrators to administratively limit binding to local UDP and TCP ports via the sysctl(8) interface. In order to enable the mac_portacl policy, MAC policy must be enforced on sockets (see mac(4)), and the port(s) protected by mac_portacl must not be included in the range specified by the net.inet.ip.portrange.reservedlow and net.inet.ip.portrange.reservedhigh sysctl(8) MIBs. Runtime Configuration The port access control list is specified in the security.mac.portacl.rules sysctl(8) MIB in the following format: idtype:id:protocol:port[,idtype:id:protocol:port,...] idtype Describes the type of subject match to be performed. Either uid for user ID matching, or gid for group ID matching. id The user or group ID (depending on idtype) allowed to bind to the specified port. NOTE: User and group names are not valid; only the actual ID numbers may be used. protocol Describes which protocol this entry applies to. Either tcp or udp are supported. port Describes which port this entry applies to. NOTE: MAC security policies may not override other security system policies by al- lowing accesses that they may deny, such as net.inet.ip.portrange.reservedlow / net.inet.ip.portrange.reservedhigh. If the specified port falls within the range specified, the mac_portacl entry will not function (i.e., even the specified user/group may not be able to bind to the specified port). SEE ALSO mac(3), mac_biba(4), mac_bsdextended(4), mac_ifoff(4), mac_mls(4), mac_none(4), mac_partition(4), mac_seeotheruids(4), mac_test(4), mac(9) HISTORY MAC first appeared in FreeBSD 5.0. AUTHORS This software was contributed to the FreeBSD Project by NAI Labs, the Se- curity Research Division of Network Associates Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research program. BSD March 11, 2003 BSD
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | AUTHORS
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