Add MLS constraints for several network related access controls including the new ingress/egress controls and the older Secmark controls. Based on the following post to the SELinux Reference Policy mailing list: * http://oss.tresys.com/pipermail/refpolicy/2009-February/000579.html Signed-off-by: Paul Moore <paul.moore@xxxxxx> --- policy/mls | 45 +++++++++++++++++++++++++++++++++++++++++++ policy/modules/kernel/mls.if | 42 ++++++++++++++++++++++++++++++++++++++++ policy/modules/kernel/mls.te | 2 + 3 files changed, 89 insertions(+) Index: refpolicy_svn_repo/policy/mls =================================================================== --- refpolicy_svn_repo.orig/policy/mls +++ refpolicy_svn_repo/policy/mls @@ -295,8 +295,53 @@ mlsconstrain { netif node } { tcp_send u # these access vectors have no MLS restrictions # node enforce_dest +# +# MLS policy for the network ingress/egress controls +# + +# the netif ingress/egress ops, the ingress permission is a "write" operation +# because the subject in this particular case is the remote domain which is +# writing data out the network interface which is acting as the object +mlsconstrain { netif } { ingress } + ((( l1 dom l2 ) and ( l1 domby h2 )) or + ( t1 == mlsnetinbound ) or + ( t1 == unlabeled_t )); +mlsconstrain { netif } { egress } + ((( l1 dom l2 ) and ( l1 domby h2 )) or + ( t1 == mlsnetoutbound )); +# the node recvfrom/sendto ops, the recvfrom permission is a "write" operation +# because the subject in this particular case is the remote domain which is +# writing data out the network node which is acting as the object +mlsconstrain { node } { recvfrom } + ((( l1 dom l2 ) and ( l1 domby h2 )) or + ( t1 == mlsnetinbound ) or + ( t1 == unlabeled_t )); +mlsconstrain { node } { sendto } + ((( l1 dom l2 ) and ( l1 domby h2 )) or + ( t1 == mlsnetoutbound )); +# the forward ops, the forward_in permission is a "write" operation because the +# subject in this particular case is the remote domain which is writing data +# to the network with a secmark label, the object in this case +mlsconstrain { packet } { forward_in } + ((( l1 dom l2 ) and ( l1 domby h2 )) or + ( t1 == mlsnetinbound ) or + ( t1 == unlabeled_t )); +mlsconstrain { packet } { forward_out } + ((( l1 dom l2 ) and ( l1 domby h2 )) or + ( t1 == mlsnetoutbound ) or + ( t1 == unlabeled_t )); + +# +# MLS policy for the secmark and peer controls +# + +# the peer/packet recv op +mlsconstrain { peer packet } { recv } + (( l1 dom l2 ) or + (( t1 == mlsnetreadtoclr ) and ( h1 dom l2 )) or + ( t1 == mlsnetread )); # # MLS policy for the process class Index: refpolicy_svn_repo/policy/modules/kernel/mls.if =================================================================== --- refpolicy_svn_repo.orig/policy/modules/kernel/mls.if +++ refpolicy_svn_repo/policy/modules/kernel/mls.if @@ -332,6 +332,48 @@ interface(`mls_net_write_within_range',` ######################################## ## <summary> +## Make specified domain trusted to +## write inbound packets regardless of the +## network's or node's MLS range. +## </summary> +## <param name="domain"> +## <summary> +## Domain allowed access. +## </summary> +## </param> +## <rolecap/> +# +interface(`mls_net_inbound_all_levels',` + gen_require(` + attribute mlsnetinbound; + ') + + typeattribute $1 mlsnetinbound; +') + +######################################## +## <summary> +## Make specified domain trusted to +## write outbound packets regardless of the +## network's or node's MLS range. +## </summary> +## <param name="domain"> +## <summary> +## Domain allowed access. +## </summary> +## </param> +## <rolecap/> +# +interface(`mls_net_outbound_all_levels',` + gen_require(` + attribute mlsnetoutbound; + ') + + typeattribute $1 mlsnetoutbound; +') + +######################################## +## <summary> ## Make specified domain MLS trusted ## for reading from System V IPC objects ## up to its clearance. Index: refpolicy_svn_repo/policy/modules/kernel/mls.te =================================================================== --- refpolicy_svn_repo.orig/policy/modules/kernel/mls.te +++ refpolicy_svn_repo/policy/modules/kernel/mls.te @@ -22,6 +22,8 @@ attribute mlsnetwriteranged; attribute mlsnetupgrade; attribute mlsnetdowngrade; attribute mlsnetrecvall; +attribute mlsnetinbound; +attribute mlsnetoutbound; attribute mlsipcread; attribute mlsipcreadtoclr; -- paul moore linux @ hp -- This message was distributed to subscribers of the selinux mailing list. If you no longer wish to subscribe, send mail to majordomo@xxxxxxxxxxxxx with the words "unsubscribe selinux" without quotes as the message.
