Introduce two new MAC Framework and MAC policy entry points:

  mac_reflect_mbuf_icmp()
  mac_reflect_mbuf_tcp()

These entry points permit MAC policies to do "update in place"
changes to the labels on ICMP and TCP mbuf headers when an ICMP or
TCP response is generated to a packet outside of the context of
an existing socket.  For example, in respond to a ping or a RST
packet to a SYN on a closed port.

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

13 files changed, 181 insertions, 0 deletions

diff --git a/sys/kern/kern_mac.c b/sys/kern/kern_mac.c
index dcd8831..490b492 100644
--- a/sys/kern/kern_mac.c
+++ b/sys/kern/kern_mac.c
@@ -2398,6 +2398,25 @@ mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
 }
 
 void
+mac_reflect_mbuf_icmp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_icmp, m, label);
+}
+void
+mac_reflect_mbuf_tcp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_tcp, m, label);
+}
+
+void
 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
 {
 	struct label *label;
diff --git a/sys/security/mac/mac_framework.c b/sys/security/mac/mac_framework.c
index dcd8831..490b492 100644
--- a/sys/security/mac/mac_framework.c
+++ b/sys/security/mac/mac_framework.c
@@ -2398,6 +2398,25 @@ mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
 }
 
 void
+mac_reflect_mbuf_icmp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_icmp, m, label);
+}
+void
+mac_reflect_mbuf_tcp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_tcp, m, label);
+}
+
+void
 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
 {
 	struct label *label;
diff --git a/sys/security/mac/mac_framework.h b/sys/security/mac/mac_framework.h
index 046c2fc..b0d8829 100644
--- a/sys/security/mac/mac_framework.h
+++ b/sys/security/mac/mac_framework.h
@@ -210,6 +210,8 @@ void	mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf,
 	    struct ifnet *ifnet, struct mbuf *newmbuf);
 void	mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf);
 int	mac_fragment_match(struct mbuf *fragment, struct ipq *ipq);
+void	mac_reflect_mbuf_icmp(struct mbuf *m);
+void	mac_reflect_mbuf_tcp(struct mbuf *m);
 void	mac_update_ipq(struct mbuf *fragment, struct ipq *ipq);
 
 /*
diff --git a/sys/security/mac/mac_internal.h b/sys/security/mac/mac_internal.h
index dcd8831..490b492 100644
--- a/sys/security/mac/mac_internal.h
+++ b/sys/security/mac/mac_internal.h
@@ -2398,6 +2398,25 @@ mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
 }
 
 void
+mac_reflect_mbuf_icmp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_icmp, m, label);
+}
+void
+mac_reflect_mbuf_tcp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_tcp, m, label);
+}
+
+void
 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
 {
 	struct label *label;
diff --git a/sys/security/mac/mac_net.c b/sys/security/mac/mac_net.c
index dcd8831..490b492 100644
--- a/sys/security/mac/mac_net.c
+++ b/sys/security/mac/mac_net.c
@@ -2398,6 +2398,25 @@ mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
 }
 
 void
+mac_reflect_mbuf_icmp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_icmp, m, label);
+}
+void
+mac_reflect_mbuf_tcp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_tcp, m, label);
+}
+
+void
 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
 {
 	struct label *label;
diff --git a/sys/security/mac/mac_pipe.c b/sys/security/mac/mac_pipe.c
index dcd8831..490b492 100644
--- a/sys/security/mac/mac_pipe.c
+++ b/sys/security/mac/mac_pipe.c
@@ -2398,6 +2398,25 @@ mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
 }
 
 void
+mac_reflect_mbuf_icmp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_icmp, m, label);
+}
+void
+mac_reflect_mbuf_tcp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_tcp, m, label);
+}
+
+void
 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
 {
 	struct label *label;
diff --git a/sys/security/mac/mac_policy.h b/sys/security/mac/mac_policy.h
index d38efe4..005d6c7 100644
--- a/sys/security/mac/mac_policy.h
+++ b/sys/security/mac/mac_policy.h
@@ -241,6 +241,9 @@ struct mac_policy_ops {
 	int	(*mpo_fragment_match)(struct mbuf *fragment,
 		    struct label *fragmentlabel, struct ipq *ipq,
 		    struct label *ipqlabel);
+	void	(*mpo_reflect_mbuf_icmp)(struct mbuf *m,
+		    struct label *mlabel);
+	void	(*mpo_reflect_mbuf_tcp)(struct mbuf *m, struct label *mlabel);
 	void	(*mpo_relabel_ifnet)(struct ucred *cred, struct ifnet *ifnet,
 		    struct label *ifnetlabel, struct label *newlabel);
 	void	(*mpo_update_ipq)(struct mbuf *fragment,
diff --git a/sys/security/mac/mac_process.c b/sys/security/mac/mac_process.c
index dcd8831..490b492 100644
--- a/sys/security/mac/mac_process.c
+++ b/sys/security/mac/mac_process.c
@@ -2398,6 +2398,25 @@ mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
 }
 
 void
+mac_reflect_mbuf_icmp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_icmp, m, label);
+}
+void
+mac_reflect_mbuf_tcp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_tcp, m, label);
+}
+
+void
 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
 {
 	struct label *label;
diff --git a/sys/security/mac/mac_syscalls.c b/sys/security/mac/mac_syscalls.c
index dcd8831..490b492 100644
--- a/sys/security/mac/mac_syscalls.c
+++ b/sys/security/mac/mac_syscalls.c
@@ -2398,6 +2398,25 @@ mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
 }
 
 void
+mac_reflect_mbuf_icmp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_icmp, m, label);
+}
+void
+mac_reflect_mbuf_tcp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_tcp, m, label);
+}
+
+void
 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
 {
 	struct label *label;
diff --git a/sys/security/mac/mac_system.c b/sys/security/mac/mac_system.c
index dcd8831..490b492 100644
--- a/sys/security/mac/mac_system.c
+++ b/sys/security/mac/mac_system.c
@@ -2398,6 +2398,25 @@ mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
 }
 
 void
+mac_reflect_mbuf_icmp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_icmp, m, label);
+}
+void
+mac_reflect_mbuf_tcp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_tcp, m, label);
+}
+
+void
 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
 {
 	struct label *label;
diff --git a/sys/security/mac/mac_vfs.c b/sys/security/mac/mac_vfs.c
index dcd8831..490b492 100644
--- a/sys/security/mac/mac_vfs.c
+++ b/sys/security/mac/mac_vfs.c
@@ -2398,6 +2398,25 @@ mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
 }
 
 void
+mac_reflect_mbuf_icmp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_icmp, m, label);
+}
+void
+mac_reflect_mbuf_tcp(struct mbuf *m)
+{
+	struct label *label;
+
+	label = mbuf_to_label(m);
+
+	MAC_PERFORM(reflect_mbuf_tcp, m, label);
+}
+
+void
 mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
 {
 	struct label *label;
diff --git a/sys/sys/mac.h b/sys/sys/mac.h
index 046c2fc..b0d8829 100644
--- a/sys/sys/mac.h
+++ b/sys/sys/mac.h
@@ -210,6 +210,8 @@ void	mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf,
 	    struct ifnet *ifnet, struct mbuf *newmbuf);
 void	mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf);
 int	mac_fragment_match(struct mbuf *fragment, struct ipq *ipq);
+void	mac_reflect_mbuf_icmp(struct mbuf *m);
+void	mac_reflect_mbuf_tcp(struct mbuf *m);
 void	mac_update_ipq(struct mbuf *fragment, struct ipq *ipq);
 
 /*
diff --git a/sys/sys/mac_policy.h b/sys/sys/mac_policy.h
index d38efe4..005d6c7 100644
--- a/sys/sys/mac_policy.h
+++ b/sys/sys/mac_policy.h
@@ -241,6 +241,9 @@ struct mac_policy_ops {
 	int	(*mpo_fragment_match)(struct mbuf *fragment,
 		    struct label *fragmentlabel, struct ipq *ipq,
 		    struct label *ipqlabel);
+	void	(*mpo_reflect_mbuf_icmp)(struct mbuf *m,
+		    struct label *mlabel);
+	void	(*mpo_reflect_mbuf_tcp)(struct mbuf *m, struct label *mlabel);
 	void	(*mpo_relabel_ifnet)(struct ucred *cred, struct ifnet *ifnet,
 		    struct label *ifnetlabel, struct label *newlabel);
 	void	(*mpo_update_ipq)(struct mbuf *fragment,