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- /*-
- * Copyright (c) 1999-2002, 2007, 2009, 2019 Robert N. M. Watson
- * Copyright (c) 2001 Ilmar S. Habibulin
- * Copyright (c) 2001-2004 Networks Associates Technology, Inc.
- * Copyright (c) 2006 SPARTA, Inc.
- * Copyright (c) 2008 Apple 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.
- *
- * This software was enhanced by SPARTA ISSO under SPAWAR contract
- * N66001-04-C-6019 ("SEFOS").
- *
- * This software was developed at the University of Cambridge Computer
- * Laboratory with support from a grant from Google, Inc.
- *
- * 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>
- #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/sbuf.h>
- #include <sys/sdt.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 <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_framework.h>
- #include <security/mac/mac_internal.h>
- #include <security/mac/mac_policy.h>
- static struct label *
- mac_inpcb_label_alloc(int flag)
- {
- struct label *label;
- int error;
- label = mac_labelzone_alloc(flag);
- if (label == NULL)
- return (NULL);
- if (flag & M_WAITOK)
- MAC_POLICY_CHECK(inpcb_init_label, label, flag);
- else
- MAC_POLICY_CHECK_NOSLEEP(inpcb_init_label, label, flag);
- if (error) {
- MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label);
- mac_labelzone_free(label);
- return (NULL);
- }
- return (label);
- }
- int
- mac_inpcb_init(struct inpcb *inp, int flag)
- {
- if (mac_labeled & MPC_OBJECT_INPCB) {
- inp->inp_label = mac_inpcb_label_alloc(flag);
- if (inp->inp_label == NULL)
- return (ENOMEM);
- } else
- inp->inp_label = NULL;
- return (0);
- }
- /* Check with rules in module if the IPv4 address is allowed. */
- int
- mac_inet_check_add_addr(struct ucred *cred, const struct in_addr *ia,
- struct ifnet *ifp)
- {
- int error;
- MAC_POLICY_CHECK(ip4_check_jail, cred, ia, ifp);
- return (error);
- }
- static struct label *
- mac_ipq_label_alloc(int flag)
- {
- struct label *label;
- int error;
- label = mac_labelzone_alloc(flag);
- if (label == NULL)
- return (NULL);
- if (flag & M_WAITOK)
- MAC_POLICY_CHECK(ipq_init_label, label, flag);
- else
- MAC_POLICY_CHECK_NOSLEEP(ipq_init_label, label, flag);
- if (error) {
- MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label);
- mac_labelzone_free(label);
- return (NULL);
- }
- return (label);
- }
- int
- mac_ipq_init(struct ipq *q, int flag)
- {
- if (mac_labeled & MPC_OBJECT_IPQ) {
- q->ipq_label = mac_ipq_label_alloc(flag);
- if (q->ipq_label == NULL)
- return (ENOMEM);
- } else
- q->ipq_label = NULL;
- return (0);
- }
- static void
- mac_inpcb_label_free(struct label *label)
- {
- MAC_POLICY_PERFORM_NOSLEEP(inpcb_destroy_label, label);
- mac_labelzone_free(label);
- }
- void
- mac_inpcb_destroy(struct inpcb *inp)
- {
- if (inp->inp_label != NULL) {
- mac_inpcb_label_free(inp->inp_label);
- inp->inp_label = NULL;
- }
- }
- static void
- mac_ipq_label_free(struct label *label)
- {
- MAC_POLICY_PERFORM_NOSLEEP(ipq_destroy_label, label);
- mac_labelzone_free(label);
- }
- void
- mac_ipq_destroy(struct ipq *q)
- {
- if (q->ipq_label != NULL) {
- mac_ipq_label_free(q->ipq_label);
- q->ipq_label = NULL;
- }
- }
- void
- mac_inpcb_create(struct socket *so, struct inpcb *inp)
- {
- MAC_POLICY_PERFORM_NOSLEEP(inpcb_create, so, so->so_label, inp,
- inp->inp_label);
- }
- void
- mac_ipq_reassemble(struct ipq *q, struct mbuf *m)
- {
- struct label *label;
- if (mac_policy_count == 0)
- return;
- label = mac_mbuf_to_label(m);
- MAC_POLICY_PERFORM_NOSLEEP(ipq_reassemble, q, q->ipq_label, m,
- label);
- }
- void
- mac_netinet_fragment(struct mbuf *m, struct mbuf *frag)
- {
- struct label *mlabel, *fraglabel;
- if (mac_policy_count == 0)
- return;
- mlabel = mac_mbuf_to_label(m);
- fraglabel = mac_mbuf_to_label(frag);
- MAC_POLICY_PERFORM_NOSLEEP(netinet_fragment, m, mlabel, frag,
- fraglabel);
- }
- void
- mac_ipq_create(struct mbuf *m, struct ipq *q)
- {
- struct label *label;
- if (mac_policy_count == 0)
- return;
- label = mac_mbuf_to_label(m);
- MAC_POLICY_PERFORM_NOSLEEP(ipq_create, m, label, q, q->ipq_label);
- }
- void
- mac_inpcb_create_mbuf(struct inpcb *inp, struct mbuf *m)
- {
- struct label *mlabel;
- INP_LOCK_ASSERT(inp);
- if (mac_policy_count == 0)
- return;
- mlabel = mac_mbuf_to_label(m);
- MAC_POLICY_PERFORM_NOSLEEP(inpcb_create_mbuf, inp, inp->inp_label, m,
- mlabel);
- }
- int
- mac_ipq_match(struct mbuf *m, struct ipq *q)
- {
- struct label *label;
- int result;
- if (mac_policy_count == 0)
- return (1);
- label = mac_mbuf_to_label(m);
- result = 1;
- MAC_POLICY_BOOLEAN_NOSLEEP(ipq_match, &&, m, label, q, q->ipq_label);
- return (result);
- }
- void
- mac_netinet_arp_send(struct ifnet *ifp, struct mbuf *m)
- {
- struct label *mlabel;
- int locked;
- if (mac_policy_count == 0)
- return;
- mlabel = mac_mbuf_to_label(m);
- MAC_IFNET_LOCK(ifp, locked);
- MAC_POLICY_PERFORM_NOSLEEP(netinet_arp_send, ifp, if_getmaclabel(ifp),
- m, mlabel);
- MAC_IFNET_UNLOCK(ifp, locked);
- }
- void
- mac_netinet_icmp_reply(struct mbuf *mrecv, struct mbuf *msend)
- {
- struct label *mrecvlabel, *msendlabel;
- if (mac_policy_count == 0)
- return;
- mrecvlabel = mac_mbuf_to_label(mrecv);
- msendlabel = mac_mbuf_to_label(msend);
- MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_reply, mrecv, mrecvlabel,
- msend, msendlabel);
- }
- void
- mac_netinet_icmp_replyinplace(struct mbuf *m)
- {
- struct label *label;
- if (mac_policy_count == 0)
- return;
- label = mac_mbuf_to_label(m);
- MAC_POLICY_PERFORM_NOSLEEP(netinet_icmp_replyinplace, m, label);
- }
- void
- mac_netinet_igmp_send(struct ifnet *ifp, struct mbuf *m)
- {
- struct label *mlabel;
- int locked;
- if (mac_policy_count == 0)
- return;
- mlabel = mac_mbuf_to_label(m);
- MAC_IFNET_LOCK(ifp, locked);
- MAC_POLICY_PERFORM_NOSLEEP(netinet_igmp_send, ifp, if_getmaclabel(ifp),
- m, mlabel);
- MAC_IFNET_UNLOCK(ifp, locked);
- }
- void
- mac_netinet_tcp_reply(struct mbuf *m)
- {
- struct label *label;
- if (mac_policy_count == 0)
- return;
- label = mac_mbuf_to_label(m);
- MAC_POLICY_PERFORM_NOSLEEP(netinet_tcp_reply, m, label);
- }
- void
- mac_ipq_update(struct mbuf *m, struct ipq *q)
- {
- struct label *label;
- if (mac_policy_count == 0)
- return;
- label = mac_mbuf_to_label(m);
- MAC_POLICY_PERFORM_NOSLEEP(ipq_update, m, label, q, q->ipq_label);
- }
- MAC_CHECK_PROBE_DEFINE2(inpcb_check_deliver, "struct inpcb *",
- "struct mbuf *");
- int
- mac_inpcb_check_deliver(struct inpcb *inp, struct mbuf *m)
- {
- struct label *label;
- int error;
- M_ASSERTPKTHDR(m);
- if (mac_policy_count == 0)
- return (0);
- label = mac_mbuf_to_label(m);
- MAC_POLICY_CHECK_NOSLEEP(inpcb_check_deliver, inp, inp->inp_label, m,
- label);
- MAC_CHECK_PROBE2(inpcb_check_deliver, error, inp, m);
- return (error);
- }
- MAC_CHECK_PROBE_DEFINE2(inpcb_check_visible, "struct ucred *",
- "struct inpcb *");
- int
- mac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp)
- {
- int error;
- INP_LOCK_ASSERT(inp);
- MAC_POLICY_CHECK_NOSLEEP(inpcb_check_visible, cred, inp,
- inp->inp_label);
- MAC_CHECK_PROBE2(inpcb_check_visible, error, cred, inp);
- return (error);
- }
- void
- mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp)
- {
- INP_WLOCK_ASSERT(inp);
- SOCK_LOCK_ASSERT(so);
- MAC_POLICY_PERFORM_NOSLEEP(inpcb_sosetlabel, so, so->so_label, inp,
- inp->inp_label);
- }
- void
- mac_netinet_firewall_reply(struct mbuf *mrecv, struct mbuf *msend)
- {
- struct label *mrecvlabel, *msendlabel;
- M_ASSERTPKTHDR(mrecv);
- M_ASSERTPKTHDR(msend);
- if (mac_policy_count == 0)
- return;
- mrecvlabel = mac_mbuf_to_label(mrecv);
- msendlabel = mac_mbuf_to_label(msend);
- MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_reply, mrecv, mrecvlabel,
- msend, msendlabel);
- }
- void
- mac_netinet_firewall_send(struct mbuf *m)
- {
- struct label *label;
- M_ASSERTPKTHDR(m);
- if (mac_policy_count == 0)
- return;
- label = mac_mbuf_to_label(m);
- MAC_POLICY_PERFORM_NOSLEEP(netinet_firewall_send, m, label);
- }
- /*
- * These functions really should be referencing the syncache structure
- * instead of the label. However, due to some of the complexities associated
- * with exposing this syncache structure we operate directly on its label
- * pointer. This should be OK since we aren't making any access control
- * decisions within this code directly, we are merely allocating and copying
- * label storage so we can properly initialize mbuf labels for any packets
- * the syncache code might create.
- */
- void
- mac_syncache_destroy(struct label **label)
- {
- if (*label != NULL) {
- MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label, *label);
- mac_labelzone_free(*label);
- *label = NULL;
- }
- }
- int
- mac_syncache_init(struct label **label)
- {
- int error;
- if (mac_labeled & MPC_OBJECT_SYNCACHE) {
- *label = mac_labelzone_alloc(M_NOWAIT);
- if (*label == NULL)
- return (ENOMEM);
- /*
- * Since we are holding the inpcb locks the policy can not
- * allocate policy specific label storage using M_WAITOK. So
- * we need to do a MAC_CHECK instead of the typical
- * MAC_PERFORM so we can propagate allocation failures back
- * to the syncache code.
- */
- MAC_POLICY_CHECK_NOSLEEP(syncache_init_label, *label,
- M_NOWAIT);
- if (error) {
- MAC_POLICY_PERFORM_NOSLEEP(syncache_destroy_label,
- *label);
- mac_labelzone_free(*label);
- }
- return (error);
- } else
- *label = NULL;
- return (0);
- }
- void
- mac_syncache_create(struct label *label, struct inpcb *inp)
- {
- INP_LOCK_ASSERT(inp);
- MAC_POLICY_PERFORM_NOSLEEP(syncache_create, label, inp);
- }
- void
- mac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m)
- {
- struct label *mlabel;
- M_ASSERTPKTHDR(m);
- if (mac_policy_count == 0)
- return;
- mlabel = mac_mbuf_to_label(m);
- MAC_POLICY_PERFORM_NOSLEEP(syncache_create_mbuf, sc_label, m,
- mlabel);
- }
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