Move inet and inet6 related MAC Framework entry points from mac_net.c

to a new mac_inet.c.  This code is now conditionally compiled based
on inet support being compiled into the kernel.

Move socket related MAC Framework entry points from mac_net.c to a new
mac_socket.c.

To do this, some additional _enforce MIB variables are now non-static.
In addition, mbuf_to_label() is now mac_mbuf_to_label() and non-static.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, McAfee Research

1 files changed, 487 insertions, 0 deletions

diff --git a/sys/security/mac/mac_socket.c b/sys/security/mac/mac_socket.c
new file mode 100644
index 0000000..1ddef70
--- /dev/null
+++ b/sys/security/mac/mac_socket.c
@@ -0,0 +1,487 @@
+/*-
+ * Copyright (c) 1999-2002 Robert N. M. Watson
+ * Copyright (c) 2001 Ilmar S. Habibulin
+ * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Robert Watson and Ilmar Habibulin for the
+ * TrustedBSD Project.
+ *
+ * This software was developed for the FreeBSD Project in part by Network
+ * Associates Laboratories, the Security Research Division of Network
+ * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
+ * as part of the DARPA CHATS research program.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_mac.h"
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/mac.h>
+#include <sys/sbuf.h>
+#include <sys/systm.h>
+#include <sys/mount.h>
+#include <sys/file.h>
+#include <sys/namei.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/sysctl.h>
+
+#include <sys/mac_policy.h>
+
+#include <net/bpfdesc.h>
+#include <net/if.h>
+#include <net/if_var.h>
+
+#include <netinet/in.h>
+#include <netinet/in_pcb.h>
+#include <netinet/ip_var.h>
+
+#include <security/mac/mac_internal.h>
+
+/*
+ * mac_enforce_socket is used by the inet code when delivering to an inpcb
+ * without hitting the socket layer, and has to be non-static for now.
+ */
+int	mac_enforce_socket = 1;
+SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW,
+    &mac_enforce_socket, 0, "Enforce MAC policy on socket operations");
+TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket);
+
+#ifdef MAC_DEBUG
+static unsigned int nmacsockets;
+
+SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD,
+    &nmacsockets, 0, "number of sockets in use");
+#endif
+
+struct label *
+mac_socket_label_alloc(int flag)
+{
+	struct label *label;
+	int error;
+
+	label = mac_labelzone_alloc(flag);
+	if (label == NULL)
+		return (NULL);
+
+	MAC_CHECK(init_socket_label, label, flag);
+	if (error) {
+		MAC_PERFORM(destroy_socket_label, label);
+		mac_labelzone_free(label);
+		return (NULL);
+	}
+	MAC_DEBUG_COUNTER_INC(&nmacsockets);
+	return (label);
+}
+
+static struct label *
+mac_socket_peer_label_alloc(int flag)
+{
+	struct label *label;
+	int error;
+
+	label = mac_labelzone_alloc(flag);
+	if (label == NULL)
+		return (NULL);
+
+	MAC_CHECK(init_socket_peer_label, label, flag);
+	if (error) {
+		MAC_PERFORM(destroy_socket_peer_label, label);
+		mac_labelzone_free(label);
+		return (NULL);
+	}
+	MAC_DEBUG_COUNTER_INC(&nmacsockets);
+	return (label);
+}
+
+int
+mac_init_socket(struct socket *so, int flag)
+{
+
+	so->so_label = mac_socket_label_alloc(flag);
+	if (so->so_label == NULL)
+		return (ENOMEM);
+	so->so_peerlabel = mac_socket_peer_label_alloc(flag);
+	if (so->so_peerlabel == NULL) {
+		mac_socket_label_free(so->so_label);
+		so->so_label = NULL;
+		return (ENOMEM);
+	}
+	return (0);
+}
+
+void
+mac_socket_label_free(struct label *label)
+{
+
+	MAC_PERFORM(destroy_socket_label, label);
+	mac_labelzone_free(label);
+	MAC_DEBUG_COUNTER_DEC(&nmacsockets);
+}
+
+static void
+mac_socket_peer_label_free(struct label *label)
+{
+
+	MAC_PERFORM(destroy_socket_peer_label, label);
+	mac_labelzone_free(label);
+	MAC_DEBUG_COUNTER_DEC(&nmacsockets);
+}
+
+void
+mac_destroy_socket(struct socket *socket)
+{
+
+	mac_socket_label_free(socket->so_label);
+	socket->so_label = NULL;
+	mac_socket_peer_label_free(socket->so_peerlabel);
+	socket->so_peerlabel = NULL;
+}
+
+void
+mac_copy_socket_label(struct label *src, struct label *dest)
+{
+
+	MAC_PERFORM(copy_socket_label, src, dest);
+}
+
+int
+mac_externalize_socket_label(struct label *label, char *elements,
+    char *outbuf, size_t outbuflen)
+{
+	int error;
+
+	MAC_EXTERNALIZE(socket, label, elements, outbuf, outbuflen);
+
+	return (error);
+}
+
+static int
+mac_externalize_socket_peer_label(struct label *label, char *elements,
+    char *outbuf, size_t outbuflen)
+{
+	int error;
+
+	MAC_EXTERNALIZE(socket_peer, label, elements, outbuf, outbuflen);
+
+	return (error);
+}
+
+int
+mac_internalize_socket_label(struct label *label, char *string)
+{
+	int error;
+
+	MAC_INTERNALIZE(socket, label, string);
+
+	return (error);
+}
+
+void
+mac_create_socket(struct ucred *cred, struct socket *socket)
+{
+
+	MAC_PERFORM(create_socket, cred, socket, socket->so_label);
+}
+
+void
+mac_create_socket_from_socket(struct socket *oldsocket,
+    struct socket *newsocket)
+{
+
+	MAC_PERFORM(create_socket_from_socket, oldsocket, oldsocket->so_label,
+	    newsocket, newsocket->so_label);
+}
+
+static void
+mac_relabel_socket(struct ucred *cred, struct socket *socket,
+    struct label *newlabel)
+{
+
+	MAC_PERFORM(relabel_socket, cred, socket, socket->so_label, newlabel);
+}
+
+void
+mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket)
+{
+	struct label *label;
+
+	label = mac_mbuf_to_label(mbuf);
+
+	MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, label, socket,
+	    socket->so_peerlabel);
+}
+
+void
+mac_set_socket_peer_from_socket(struct socket *oldsocket,
+    struct socket *newsocket)
+{
+
+	MAC_PERFORM(set_socket_peer_from_socket, oldsocket,
+	    oldsocket->so_label, newsocket, newsocket->so_peerlabel);
+}
+
+void
+mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf)
+{
+	struct label *label;
+
+	label = mac_mbuf_to_label(mbuf);
+
+	MAC_PERFORM(create_mbuf_from_socket, socket, socket->so_label, mbuf,
+	    label);
+}
+
+int
+mac_check_socket_bind(struct ucred *ucred, struct socket *socket,
+    struct sockaddr *sockaddr)
+{
+	int error;
+
+	if (!mac_enforce_socket)
+		return (0);
+
+	MAC_CHECK(check_socket_bind, ucred, socket, socket->so_label,
+	    sockaddr);
+
+	return (error);
+}
+
+int
+mac_check_socket_connect(struct ucred *cred, struct socket *socket,
+    struct sockaddr *sockaddr)
+{
+	int error;
+
+	if (!mac_enforce_socket)
+		return (0);
+
+	MAC_CHECK(check_socket_connect, cred, socket, socket->so_label,
+	    sockaddr);
+
+	return (error);
+}
+
+int
+mac_check_socket_deliver(struct socket *socket, struct mbuf *mbuf)
+{
+	struct label *label;
+	int error;
+
+	if (!mac_enforce_socket)
+		return (0);
+
+	label = mac_mbuf_to_label(mbuf);
+
+	MAC_CHECK(check_socket_deliver, socket, socket->so_label, mbuf,
+	    label);
+
+	return (error);
+}
+
+int
+mac_check_socket_listen(struct ucred *cred, struct socket *socket)
+{
+	int error;
+
+	if (!mac_enforce_socket)
+		return (0);
+
+	MAC_CHECK(check_socket_listen, cred, socket, socket->so_label);
+	return (error);
+}
+
+int
+mac_check_socket_receive(struct ucred *cred, struct socket *so)
+{
+	int error;
+
+	if (!mac_enforce_socket)
+		return (0);
+
+	MAC_CHECK(check_socket_receive, cred, so, so->so_label);
+
+	return (error);
+}
+
+static int
+mac_check_socket_relabel(struct ucred *cred, struct socket *socket,
+    struct label *newlabel)
+{
+	int error;
+
+	MAC_CHECK(check_socket_relabel, cred, socket, socket->so_label,
+	    newlabel);
+
+	return (error);
+}
+
+int
+mac_check_socket_send(struct ucred *cred, struct socket *so)
+{
+	int error;
+
+	if (!mac_enforce_socket)
+		return (0);
+
+	MAC_CHECK(check_socket_send, cred, so, so->so_label);
+
+	return (error);
+}
+
+int
+mac_check_socket_visible(struct ucred *cred, struct socket *socket)
+{
+	int error;
+
+	if (!mac_enforce_socket)
+		return (0);
+
+	MAC_CHECK(check_socket_visible, cred, socket, socket->so_label);
+
+	return (error);
+}
+
+int
+mac_socket_label_set(struct ucred *cred, struct socket *so,
+    struct label *label)
+{
+	int error;
+
+	error = mac_check_socket_relabel(cred, so, label);
+	if (error)
+		return (error);
+
+	mac_relabel_socket(cred, so, label);
+
+	/*
+	 * If the protocol has expressed interest in socket layer changes,
+	 * such as if it needs to propagate changes to a cached pcb
+	 * label from the socket, notify it of the label change while
+	 * holding the socket lock.
+	 */
+	if (so->so_proto->pr_usrreqs->pru_sosetlabel != NULL)
+		(so->so_proto->pr_usrreqs->pru_sosetlabel)(so);
+
+	return (0);
+}
+
+int
+mac_setsockopt_label(struct ucred *cred, struct socket *so, struct mac *mac)
+{
+	struct label *intlabel;
+	char *buffer;
+	int error;
+
+	error = mac_check_structmac_consistent(mac);
+	if (error)
+		return (error);
+
+	buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK);
+	error = copyinstr(mac->m_string, buffer, mac->m_buflen, NULL);
+	if (error) {
+		free(buffer, M_MACTEMP);
+		return (error);
+	}
+
+	intlabel = mac_socket_label_alloc(M_WAITOK);
+	error = mac_internalize_socket_label(intlabel, buffer);
+	free(buffer, M_MACTEMP);
+	if (error)
+		goto out;
+
+	/* XXX: Socket lock here. */
+	error = mac_socket_label_set(cred, so, intlabel);
+	/* XXX: Socket unlock here. */
+out:
+	mac_socket_label_free(intlabel);
+	return (error);
+}
+
+int
+mac_getsockopt_label(struct ucred *cred, struct socket *so, struct mac *mac)
+{
+	char *buffer, *elements;
+	int error;
+
+	error = mac_check_structmac_consistent(mac);
+	if (error)
+		return (error);
+
+	elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK);
+	error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL);
+	if (error) {
+		free(elements, M_MACTEMP);
+		return (error);
+	}
+
+	buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
+	error = mac_externalize_socket_label(so->so_label, elements,
+	    buffer, mac->m_buflen);
+	if (error == 0)
+		error = copyout(buffer, mac->m_string, strlen(buffer)+1);
+
+	free(buffer, M_MACTEMP);
+	free(elements, M_MACTEMP);
+
+	return (error);
+}
+
+int
+mac_getsockopt_peerlabel(struct ucred *cred, struct socket *so,
+    struct mac *mac)
+{
+	char *elements, *buffer;
+	int error;
+
+	error = mac_check_structmac_consistent(mac);
+	if (error)
+		return (error);
+
+	elements = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK);
+	error = copyinstr(mac->m_string, elements, mac->m_buflen, NULL);
+	if (error) {
+		free(elements, M_MACTEMP);
+		return (error);
+	}
+
+	buffer = malloc(mac->m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
+	error = mac_externalize_socket_peer_label(so->so_peerlabel,
+	    elements, buffer, mac->m_buflen);
+	if (error == 0)
+		error = copyout(buffer, mac->m_string, strlen(buffer)+1);
+
+	free(buffer, M_MACTEMP);
+	free(elements, M_MACTEMP);
+
+	return (error);
+}