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freebsd-dev/sys/kern/kern_mac.c
Robert Watson 7ba28492c5 Declare a module service "kernel_mac_support" when MAC support is 
enabled and the kernel provides the MAC registration and entry point
service.  Declare a dependency on that module service for any
MAC module registered using mac_policy.h.  For now, hard code the
version as 1, but once we've come up with a versioning policy, we'll
move to a #define of some sort.  In the mean time, this will prevent
loading a MAC module when 'options MAC' isn't present, which (due to
a bug in the kernel linker) can result if the MAC module is preloaded
via loader.conf.

This particular evil recommended by:	peter
Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI LAbs
2002-08-12 02:00:21 +00:00

3121 lines
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/*-
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
* Copyright (c) 2001 Ilmar S. Habibulin
* Copyright (c) 2001, 2002 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 NAI Labs,
* 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.
* 3. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* 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.
*
* $FreeBSD$
*/
/*
* Developed by the TrustedBSD Project.
*
* Framework for extensible kernel access control. Kernel and userland
* interface to the framework, policy registration and composition.
*/
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/extattr.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sx.h>
#include <sys/mac.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/sysent.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/namei.h>
#include <sys/socket.h>
#include <sys/pipe.h>
#include <sys/socketvar.h>
#include <sys/sx.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <sys/mac_policy.h>
#include <fs/devfs/devfs.h>
#include <net/bpf.h>
#include <net/bpfdesc.h>
#include <net/if.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/ip_var.h>
#ifdef MAC
/*
* Declare that the kernel provides MAC support, version 1. This permits
* modules to refuse to be loaded if the necessary support isn't present,
* even if it's pre-boot.
*/
MODULE_VERSION(kernel_mac_support, 1);
SYSCTL_DECL(_security);
SYSCTL_NODE(_security, OID_AUTO, mac, CTLFLAG_RW, 0,
"TrustedBSD MAC policy controls");
SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0,
"TrustedBSD MAC debug info");
static int mac_debug_label_fallback = 0;
SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW,
&mac_debug_label_fallback, 0, "Filesystems should fall back to fs label"
"when label is corrupted.");
TUNABLE_INT("security.mac.debug_label_fallback",
&mac_debug_label_fallback);
#ifndef MAC_MAX_POLICIES
#define MAC_MAX_POLICIES 8
#endif
#if MAC_MAX_POLICIES > 32
#error "MAC_MAX_POLICIES too large"
#endif
static unsigned int mac_max_policies = MAC_MAX_POLICIES;
static unsigned int mac_policy_offsets_free = (1 << MAC_MAX_POLICIES) - 1;
SYSCTL_UINT(_security_mac, OID_AUTO, max_policies, CTLFLAG_RD,
&mac_max_policies, 0, "");
static int mac_late = 0;
static int mac_enforce_fs = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW,
&mac_enforce_fs, 0, "Enforce MAC policy on file system objects");
TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs);
static int mac_enforce_network = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW,
&mac_enforce_network, 0, "Enforce MAC policy on network packets");
TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network);
static int mac_enforce_process = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW,
&mac_enforce_process, 0, "Enforce MAC policy on inter-process operations");
TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process);
static 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);
static int mac_enforce_pipe = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
&mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
static int mac_label_size = sizeof(struct mac);
SYSCTL_INT(_security_mac, OID_AUTO, label_size, CTLFLAG_RD,
&mac_label_size, 0, "Pre-compiled MAC label size");
static int mac_cache_fslabel_in_vnode = 1;
SYSCTL_INT(_security_mac, OID_AUTO, cache_fslabel_in_vnode, CTLFLAG_RW,
&mac_cache_fslabel_in_vnode, 0, "Cache mount fslabel in vnode");
TUNABLE_INT("security.mac.cache_fslabel_in_vnode",
&mac_cache_fslabel_in_vnode);
static int mac_vnode_label_cache_hits = 0;
SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_hits, CTLFLAG_RD,
&mac_vnode_label_cache_hits, 0, "Cache hits on vnode labels");
static int mac_vnode_label_cache_misses = 0;
SYSCTL_INT(_security_mac, OID_AUTO, vnode_label_cache_misses, CTLFLAG_RD,
&mac_vnode_label_cache_misses, 0, "Cache misses on vnode labels");
static int mac_mmap_revocation_via_cow = 1;
SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW,
&mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via "
"copy-on-write semantics, or by removing all write access");
static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs,
nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents,
nmacipqs, nmacpipes;
SYSCTL_UINT(_security_mac_debug, OID_AUTO, mbufs, CTLFLAG_RD,
&nmacmbufs, 0, "number of mbufs in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, creds, CTLFLAG_RD,
&nmaccreds, 0, "number of ucreds in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, ifnets, CTLFLAG_RD,
&nmacifnets, 0, "number of ifnets in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, ipqs, CTLFLAG_RD,
&nmacipqs, 0, "number of ipqs in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, bpfdescs, CTLFLAG_RD,
&nmacbpfdescs, 0, "number of bpfdescs in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, sockets, CTLFLAG_RD,
&nmacsockets, 0, "number of sockets in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, pipes, CTLFLAG_RD,
&nmacpipes, 0, "number of pipes in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, mounts, CTLFLAG_RD,
&nmacmounts, 0, "number of mounts in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, temp, CTLFLAG_RD,
&nmactemp, 0, "number of temporary labels in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, vnodes, CTLFLAG_RD,
&nmacvnodes, 0, "number of vnodes in use");
SYSCTL_UINT(_security_mac_debug, OID_AUTO, devfsdirents, CTLFLAG_RD,
&nmacdevfsdirents, 0, "number of devfs dirents inuse");
static int error_select(int error1, int error2);
static int mac_externalize(struct label *label, struct mac *mac);
static int mac_policy_register(struct mac_policy_conf *mpc);
static int mac_policy_unregister(struct mac_policy_conf *mpc);
static int mac_stdcreatevnode_ea(struct vnode *vp);
static void mac_cred_mmapped_drop_perms(struct thread *td,
struct ucred *cred);
static void mac_cred_mmapped_drop_perms_recurse(struct thread *td,
struct ucred *cred, struct vm_map *map);
MALLOC_DEFINE(M_MACOPVEC, "macopvec", "MAC policy operation vector");
MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes");
/*
* mac_policy_list_lock protects the consistency of 'mac_policy_list',
* the linked list of attached policy modules. Read-only consumers of
* the list must acquire a shared lock for the duration of their use;
* writers must acquire an exclusive lock. Note that for compound
* operations, locks should be held for the entire compound operation,
* and that this is not yet done for relabel requests.
*/
static struct mtx mac_policy_list_lock;
static LIST_HEAD(, mac_policy_conf) mac_policy_list;
static int mac_policy_list_busy;
#define MAC_POLICY_LIST_LOCKINIT() mtx_init(&mac_policy_list_lock, \
"mac_policy_list_lock", NULL, MTX_DEF);
#define MAC_POLICY_LIST_LOCK() mtx_lock(&mac_policy_list_lock);
#define MAC_POLICY_LIST_UNLOCK() mtx_unlock(&mac_policy_list_lock);
#define MAC_POLICY_LIST_BUSY() do { \
MAC_POLICY_LIST_LOCK(); \
mac_policy_list_busy++; \
MAC_POLICY_LIST_UNLOCK(); \
} while (0)
#define MAC_POLICY_LIST_UNBUSY() do { \
MAC_POLICY_LIST_LOCK(); \
mac_policy_list_busy--; \
if (mac_policy_list_busy < 0) \
panic("Extra mac_policy_list_busy--"); \
MAC_POLICY_LIST_UNLOCK(); \
} while (0)
/*
* MAC_CHECK performs the designated check by walking the policy
* module list and checking with each as to how it feels about the
* request. Note that it returns its value via 'error' in the scope
* of the caller.
*/
#define MAC_CHECK(check, args...) do { \
struct mac_policy_conf *mpc; \
\
error = 0; \
MAC_POLICY_LIST_BUSY(); \
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
if (mpc->mpc_ops->mpo_ ## check != NULL) \
error = error_select( \
mpc->mpc_ops->mpo_ ## check (args), \
error); \
} \
MAC_POLICY_LIST_UNBUSY(); \
} while (0)
/*
* MAC_BOOLEAN performs the designated boolean composition by walking
* the module list, invoking each instance of the operation, and
* combining the results using the passed C operator. Note that it
* returns its value via 'result' in the scope of the caller, which
* should be initialized by the caller in a meaningful way to get
* a meaningful result.
*/
#define MAC_BOOLEAN(operation, composition, args...) do { \
struct mac_policy_conf *mpc; \
\
MAC_POLICY_LIST_BUSY(); \
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
result = result composition \
mpc->mpc_ops->mpo_ ## operation (args); \
} \
MAC_POLICY_LIST_UNBUSY(); \
} while (0)
/*
* MAC_PERFORM performs the designated operation by walking the policy
* module list and invoking that operation for each policy.
*/
#define MAC_PERFORM(operation, args...) do { \
struct mac_policy_conf *mpc; \
\
MAC_POLICY_LIST_BUSY(); \
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
mpc->mpc_ops->mpo_ ## operation (args); \
} \
MAC_POLICY_LIST_UNBUSY(); \
} while (0)
/*
* Initialize the MAC subsystem, including appropriate SMP locks.
*/
static void
mac_init(void)
{
LIST_INIT(&mac_policy_list);
MAC_POLICY_LIST_LOCKINIT();
}
/*
* For the purposes of modules that want to know if they were loaded
* "early", set the mac_late flag once we've processed modules either
* linked into the kernel, or loaded before the kernel startup.
*/
static void
mac_late_init(void)
{
mac_late = 1;
}
/*
* Allow MAC policy modules to register during boot, etc.
*/
int
mac_policy_modevent(module_t mod, int type, void *data)
{
struct mac_policy_conf *mpc;
int error;
error = 0;
mpc = (struct mac_policy_conf *) data;
switch (type) {
case MOD_LOAD:
if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE &&
mac_late) {
printf("mac_policy_modevent: can't load %s policy "
"after booting\n", mpc->mpc_name);
error = EBUSY;
break;
}
error = mac_policy_register(mpc);
break;
case MOD_UNLOAD:
/* Don't unregister the module if it was never registered. */
if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED)
!= 0)
error = mac_policy_unregister(mpc);
else
error = 0;
break;
default:
break;
}
return (error);
}
static int
mac_policy_register(struct mac_policy_conf *mpc)
{
struct mac_policy_conf *tmpc;
struct mac_policy_ops *ops;
struct mac_policy_op_entry *mpe;
int slot;
MALLOC(mpc->mpc_ops, struct mac_policy_ops *, sizeof(*ops), M_MACOPVEC,
M_WAITOK | M_ZERO);
for (mpe = mpc->mpc_entries; mpe->mpe_constant != MAC_OP_LAST; mpe++) {
switch (mpe->mpe_constant) {
case MAC_OP_LAST:
/*
* Doesn't actually happen, but this allows checking
* that all enumerated values are handled.
*/
break;
case MAC_DESTROY:
mpc->mpc_ops->mpo_destroy =
mpe->mpe_function;
break;
case MAC_INIT:
mpc->mpc_ops->mpo_init =
mpe->mpe_function;
break;
case MAC_INIT_BPFDESC:
mpc->mpc_ops->mpo_init_bpfdesc =
mpe->mpe_function;
break;
case MAC_INIT_CRED:
mpc->mpc_ops->mpo_init_cred =
mpe->mpe_function;
break;
case MAC_INIT_DEVFSDIRENT:
mpc->mpc_ops->mpo_init_devfsdirent =
mpe->mpe_function;
break;
case MAC_INIT_IFNET:
mpc->mpc_ops->mpo_init_ifnet =
mpe->mpe_function;
break;
case MAC_INIT_IPQ:
mpc->mpc_ops->mpo_init_ipq =
mpe->mpe_function;
break;
case MAC_INIT_MBUF:
mpc->mpc_ops->mpo_init_mbuf =
mpe->mpe_function;
break;
case MAC_INIT_MOUNT:
mpc->mpc_ops->mpo_init_mount =
mpe->mpe_function;
break;
case MAC_INIT_PIPE:
mpc->mpc_ops->mpo_init_pipe =
mpe->mpe_function;
break;
case MAC_INIT_SOCKET:
mpc->mpc_ops->mpo_init_socket =
mpe->mpe_function;
break;
case MAC_INIT_TEMP:
mpc->mpc_ops->mpo_init_temp =
mpe->mpe_function;
break;
case MAC_INIT_VNODE:
mpc->mpc_ops->mpo_init_vnode =
mpe->mpe_function;
break;
case MAC_DESTROY_BPFDESC:
mpc->mpc_ops->mpo_destroy_bpfdesc =
mpe->mpe_function;
break;
case MAC_DESTROY_CRED:
mpc->mpc_ops->mpo_destroy_cred =
mpe->mpe_function;
break;
case MAC_DESTROY_DEVFSDIRENT:
mpc->mpc_ops->mpo_destroy_devfsdirent =
mpe->mpe_function;
break;
case MAC_DESTROY_IFNET:
mpc->mpc_ops->mpo_destroy_ifnet =
mpe->mpe_function;
break;
case MAC_DESTROY_IPQ:
mpc->mpc_ops->mpo_destroy_ipq =
mpe->mpe_function;
break;
case MAC_DESTROY_MBUF:
mpc->mpc_ops->mpo_destroy_mbuf =
mpe->mpe_function;
break;
case MAC_DESTROY_MOUNT:
mpc->mpc_ops->mpo_destroy_mount =
mpe->mpe_function;
break;
case MAC_DESTROY_PIPE:
mpc->mpc_ops->mpo_destroy_pipe =
mpe->mpe_function;
break;
case MAC_DESTROY_SOCKET:
mpc->mpc_ops->mpo_destroy_socket =
mpe->mpe_function;
break;
case MAC_DESTROY_TEMP:
mpc->mpc_ops->mpo_destroy_temp =
mpe->mpe_function;
break;
case MAC_DESTROY_VNODE:
mpc->mpc_ops->mpo_destroy_vnode =
mpe->mpe_function;
break;
case MAC_EXTERNALIZE:
mpc->mpc_ops->mpo_externalize =
mpe->mpe_function;
break;
case MAC_INTERNALIZE:
mpc->mpc_ops->mpo_internalize =
mpe->mpe_function;
break;
case MAC_CREATE_DEVFS_DEVICE:
mpc->mpc_ops->mpo_create_devfs_device =
mpe->mpe_function;
break;
case MAC_CREATE_DEVFS_DIRECTORY:
mpc->mpc_ops->mpo_create_devfs_directory =
mpe->mpe_function;
break;
case MAC_CREATE_DEVFS_VNODE:
mpc->mpc_ops->mpo_create_devfs_vnode =
mpe->mpe_function;
break;
case MAC_STDCREATEVNODE_EA:
mpc->mpc_ops->mpo_stdcreatevnode_ea =
mpe->mpe_function;
break;
case MAC_CREATE_VNODE:
mpc->mpc_ops->mpo_create_vnode =
mpe->mpe_function;
break;
case MAC_CREATE_MOUNT:
mpc->mpc_ops->mpo_create_mount =
mpe->mpe_function;
break;
case MAC_CREATE_ROOT_MOUNT:
mpc->mpc_ops->mpo_create_root_mount =
mpe->mpe_function;
break;
case MAC_RELABEL_VNODE:
mpc->mpc_ops->mpo_relabel_vnode =
mpe->mpe_function;
break;
case MAC_UPDATE_DEVFSDIRENT:
mpc->mpc_ops->mpo_update_devfsdirent =
mpe->mpe_function;
break;
case MAC_UPDATE_PROCFSVNODE:
mpc->mpc_ops->mpo_update_procfsvnode =
mpe->mpe_function;
break;
case MAC_UPDATE_VNODE_FROM_EXTATTR:
mpc->mpc_ops->mpo_update_vnode_from_extattr =
mpe->mpe_function;
break;
case MAC_UPDATE_VNODE_FROM_EXTERNALIZED:
mpc->mpc_ops->mpo_update_vnode_from_externalized =
mpe->mpe_function;
break;
case MAC_UPDATE_VNODE_FROM_MOUNT:
mpc->mpc_ops->mpo_update_vnode_from_mount =
mpe->mpe_function;
break;
case MAC_CREATE_MBUF_FROM_SOCKET:
mpc->mpc_ops->mpo_create_mbuf_from_socket =
mpe->mpe_function;
break;
case MAC_CREATE_PIPE:
mpc->mpc_ops->mpo_create_pipe =
mpe->mpe_function;
break;
case MAC_CREATE_SOCKET:
mpc->mpc_ops->mpo_create_socket =
mpe->mpe_function;
break;
case MAC_CREATE_SOCKET_FROM_SOCKET:
mpc->mpc_ops->mpo_create_socket_from_socket =
mpe->mpe_function;
break;
case MAC_RELABEL_PIPE:
mpc->mpc_ops->mpo_relabel_pipe =
mpe->mpe_function;
break;
case MAC_RELABEL_SOCKET:
mpc->mpc_ops->mpo_relabel_socket =
mpe->mpe_function;
break;
case MAC_SET_SOCKET_PEER_FROM_MBUF:
mpc->mpc_ops->mpo_set_socket_peer_from_mbuf =
mpe->mpe_function;
break;
case MAC_SET_SOCKET_PEER_FROM_SOCKET:
mpc->mpc_ops->mpo_set_socket_peer_from_socket =
mpe->mpe_function;
break;
case MAC_CREATE_BPFDESC:
mpc->mpc_ops->mpo_create_bpfdesc =
mpe->mpe_function;
break;
case MAC_CREATE_DATAGRAM_FROM_IPQ:
mpc->mpc_ops->mpo_create_datagram_from_ipq =
mpe->mpe_function;
break;
case MAC_CREATE_FRAGMENT:
mpc->mpc_ops->mpo_create_fragment =
mpe->mpe_function;
break;
case MAC_CREATE_IFNET:
mpc->mpc_ops->mpo_create_ifnet =
mpe->mpe_function;
break;
case MAC_CREATE_IPQ:
mpc->mpc_ops->mpo_create_ipq =
mpe->mpe_function;
break;
case MAC_CREATE_MBUF_FROM_MBUF:
mpc->mpc_ops->mpo_create_mbuf_from_mbuf =
mpe->mpe_function;
break;
case MAC_CREATE_MBUF_LINKLAYER:
mpc->mpc_ops->mpo_create_mbuf_linklayer =
mpe->mpe_function;
break;
case MAC_CREATE_MBUF_FROM_BPFDESC:
mpc->mpc_ops->mpo_create_mbuf_from_bpfdesc =
mpe->mpe_function;
break;
case MAC_CREATE_MBUF_FROM_IFNET:
mpc->mpc_ops->mpo_create_mbuf_from_ifnet =
mpe->mpe_function;
break;
case MAC_CREATE_MBUF_MULTICAST_ENCAP:
mpc->mpc_ops->mpo_create_mbuf_multicast_encap =
mpe->mpe_function;
break;
case MAC_CREATE_MBUF_NETLAYER:
mpc->mpc_ops->mpo_create_mbuf_netlayer =
mpe->mpe_function;
break;
case MAC_FRAGMENT_MATCH:
mpc->mpc_ops->mpo_fragment_match =
mpe->mpe_function;
break;
case MAC_RELABEL_IFNET:
mpc->mpc_ops->mpo_relabel_ifnet =
mpe->mpe_function;
break;
case MAC_UPDATE_IPQ:
mpc->mpc_ops->mpo_update_ipq =
mpe->mpe_function;
break;
case MAC_CREATE_CRED:
mpc->mpc_ops->mpo_create_cred =
mpe->mpe_function;
break;
case MAC_EXECVE_TRANSITION:
mpc->mpc_ops->mpo_execve_transition =
mpe->mpe_function;
break;
case MAC_EXECVE_WILL_TRANSITION:
mpc->mpc_ops->mpo_execve_will_transition =
mpe->mpe_function;
break;
case MAC_CREATE_PROC0:
mpc->mpc_ops->mpo_create_proc0 = mpe->mpe_function;
break;
case MAC_CREATE_PROC1:
mpc->mpc_ops->mpo_create_proc1 = mpe->mpe_function;
break;
case MAC_RELABEL_CRED:
mpc->mpc_ops->mpo_relabel_cred =
mpe->mpe_function;
break;
case MAC_CHECK_BPFDESC_RECEIVE:
mpc->mpc_ops->mpo_check_bpfdesc_receive =
mpe->mpe_function;
break;
case MAC_CHECK_CRED_RELABEL:
mpc->mpc_ops->mpo_check_cred_relabel =
mpe->mpe_function;
break;
case MAC_CHECK_CRED_VISIBLE:
mpc->mpc_ops->mpo_check_cred_visible =
mpe->mpe_function;
break;
case MAC_CHECK_IFNET_RELABEL:
mpc->mpc_ops->mpo_check_ifnet_relabel =
mpe->mpe_function;
break;
case MAC_CHECK_IFNET_TRANSMIT:
mpc->mpc_ops->mpo_check_ifnet_transmit =
mpe->mpe_function;
break;
case MAC_CHECK_MOUNT_STAT:
mpc->mpc_ops->mpo_check_mount_stat =
mpe->mpe_function;
break;
case MAC_CHECK_PIPE_IOCTL:
mpc->mpc_ops->mpo_check_pipe_ioctl =
mpe->mpe_function;
break;
case MAC_CHECK_PIPE_OP:
mpc->mpc_ops->mpo_check_pipe_op =
mpe->mpe_function;
break;
case MAC_CHECK_PIPE_RELABEL:
mpc->mpc_ops->mpo_check_pipe_relabel =
mpe->mpe_function;
break;
case MAC_CHECK_PROC_DEBUG:
mpc->mpc_ops->mpo_check_proc_debug =
mpe->mpe_function;
break;
case MAC_CHECK_PROC_SCHED:
mpc->mpc_ops->mpo_check_proc_sched =
mpe->mpe_function;
break;
case MAC_CHECK_PROC_SIGNAL:
mpc->mpc_ops->mpo_check_proc_signal =
mpe->mpe_function;
break;
case MAC_CHECK_SOCKET_BIND:
mpc->mpc_ops->mpo_check_socket_bind =
mpe->mpe_function;
break;
case MAC_CHECK_SOCKET_CONNECT:
mpc->mpc_ops->mpo_check_socket_connect =
mpe->mpe_function;
break;
case MAC_CHECK_SOCKET_LISTEN:
mpc->mpc_ops->mpo_check_socket_listen =
mpe->mpe_function;
break;
case MAC_CHECK_SOCKET_RECEIVE:
mpc->mpc_ops->mpo_check_socket_receive =
mpe->mpe_function;
break;
case MAC_CHECK_SOCKET_RELABEL:
mpc->mpc_ops->mpo_check_socket_relabel =
mpe->mpe_function;
break;
case MAC_CHECK_SOCKET_VISIBLE:
mpc->mpc_ops->mpo_check_socket_visible =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_ACCESS:
mpc->mpc_ops->mpo_check_vnode_access =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_CHDIR:
mpc->mpc_ops->mpo_check_vnode_chdir =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_CHROOT:
mpc->mpc_ops->mpo_check_vnode_chroot =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_CREATE:
mpc->mpc_ops->mpo_check_vnode_create =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_DELETE:
mpc->mpc_ops->mpo_check_vnode_delete =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_DELETEACL:
mpc->mpc_ops->mpo_check_vnode_deleteacl =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_EXEC:
mpc->mpc_ops->mpo_check_vnode_exec =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_GETACL:
mpc->mpc_ops->mpo_check_vnode_getacl =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_GETEXTATTR:
mpc->mpc_ops->mpo_check_vnode_getextattr =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_LOOKUP:
mpc->mpc_ops->mpo_check_vnode_lookup =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_MMAP_PERMS:
mpc->mpc_ops->mpo_check_vnode_mmap_perms =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_OP:
mpc->mpc_ops->mpo_check_vnode_op =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_OPEN:
mpc->mpc_ops->mpo_check_vnode_open =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_READDIR:
mpc->mpc_ops->mpo_check_vnode_readdir =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_READLINK:
mpc->mpc_ops->mpo_check_vnode_readlink =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_RELABEL:
mpc->mpc_ops->mpo_check_vnode_relabel =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_RENAME_FROM:
mpc->mpc_ops->mpo_check_vnode_rename_from =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_RENAME_TO:
mpc->mpc_ops->mpo_check_vnode_rename_to =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_REVOKE:
mpc->mpc_ops->mpo_check_vnode_revoke =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_SETACL:
mpc->mpc_ops->mpo_check_vnode_setacl =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_SETEXTATTR:
mpc->mpc_ops->mpo_check_vnode_setextattr =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_SETFLAGS:
mpc->mpc_ops->mpo_check_vnode_setflags =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_SETMODE:
mpc->mpc_ops->mpo_check_vnode_setmode =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_SETOWNER:
mpc->mpc_ops->mpo_check_vnode_setowner =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_SETUTIMES:
mpc->mpc_ops->mpo_check_vnode_setutimes =
mpe->mpe_function;
break;
case MAC_CHECK_VNODE_STAT:
mpc->mpc_ops->mpo_check_vnode_stat =
mpe->mpe_function;
break;
/*
default:
printf("MAC policy `%s': unknown operation %d\n",
mpc->mpc_name, mpe->mpe_constant);
return (EINVAL);
*/
}
}
MAC_POLICY_LIST_LOCK();
if (mac_policy_list_busy > 0) {
MAC_POLICY_LIST_UNLOCK();
FREE(mpc->mpc_ops, M_MACOPVEC);
mpc->mpc_ops = NULL;
return (EBUSY);
}
LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) {
if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) {
MAC_POLICY_LIST_UNLOCK();
FREE(mpc->mpc_ops, M_MACOPVEC);
mpc->mpc_ops = NULL;
return (EEXIST);
}
}
if (mpc->mpc_field_off != NULL) {
slot = ffs(mac_policy_offsets_free);
if (slot == 0) {
MAC_POLICY_LIST_UNLOCK();
FREE(mpc->mpc_ops, M_MACOPVEC);
mpc->mpc_ops = NULL;
return (ENOMEM);
}
slot--;
mac_policy_offsets_free &= ~(1 << slot);
*mpc->mpc_field_off = slot;
}
mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED;
LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list);
/* Per-policy initialization. */
if (mpc->mpc_ops->mpo_init != NULL)
(*(mpc->mpc_ops->mpo_init))(mpc);
MAC_POLICY_LIST_UNLOCK();
printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname,
mpc->mpc_name);
return (0);
}
static int
mac_policy_unregister(struct mac_policy_conf *mpc)
{
#if 0
/*
* Don't allow unloading modules with private data.
*/
if (mpc->mpc_field_off != NULL)
return (EBUSY);
#endif
if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0)
return (EBUSY);
MAC_POLICY_LIST_LOCK();
if (mac_policy_list_busy > 0) {
MAC_POLICY_LIST_UNLOCK();
return (EBUSY);
}
if (mpc->mpc_ops->mpo_destroy != NULL)
(*(mpc->mpc_ops->mpo_destroy))(mpc);
LIST_REMOVE(mpc, mpc_list);
MAC_POLICY_LIST_UNLOCK();
FREE(mpc->mpc_ops, M_MACOPVEC);
mpc->mpc_ops = NULL;
printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname,
mpc->mpc_name);
return (0);
}
/*
* Define an error value precedence, and given two arguments, selects the
* value with the higher precedence.
*/
static int
error_select(int error1, int error2)
{
/* Certain decision-making errors take top priority. */
if (error1 == EDEADLK || error2 == EDEADLK)
return (EDEADLK);
/* Invalid arguments should be reported where possible. */
if (error1 == EINVAL || error2 == EINVAL)
return (EINVAL);
/* Precedence goes to "visibility", with both process and file. */
if (error1 == ESRCH || error2 == ESRCH)
return (ESRCH);
if (error1 == ENOENT || error2 == ENOENT)
return (ENOENT);
/* Precedence goes to DAC/MAC protections. */
if (error1 == EACCES || error2 == EACCES)
return (EACCES);
/* Precedence goes to privilege. */
if (error1 == EPERM || error2 == EPERM)
return (EPERM);
/* Precedence goes to error over success; otherwise, arbitrary. */
if (error1 != 0)
return (error1);
return (error2);
}
void
mac_update_devfsdirent(struct devfs_dirent *de, struct vnode *vp)
{
MAC_PERFORM(update_devfsdirent, de, &de->de_label, vp, &vp->v_label);
}
void
mac_update_procfsvnode(struct vnode *vp, struct ucred *cred)
{
MAC_PERFORM(update_procfsvnode, vp, &vp->v_label, cred);
}
/*
* Support callout for policies that manage their own externalization
* using extended attributes.
*/
static int
mac_update_vnode_from_extattr(struct vnode *vp, struct mount *mp)
{
int error;
MAC_CHECK(update_vnode_from_extattr, vp, &vp->v_label, mp,
&mp->mnt_fslabel);
return (error);
}
/*
* Given an externalized mac label, internalize it and stamp it on a
* vnode.
*/
static int
mac_update_vnode_from_externalized(struct vnode *vp, struct mac *extmac)
{
int error;
MAC_CHECK(update_vnode_from_externalized, vp, &vp->v_label, extmac);
return (error);
}
/*
* Call out to individual policies to update the label in a vnode from
* the mountpoint.
*/
void
mac_update_vnode_from_mount(struct vnode *vp, struct mount *mp)
{
MAC_PERFORM(update_vnode_from_mount, vp, &vp->v_label, mp,
&mp->mnt_fslabel);
ASSERT_VOP_LOCKED(vp, "mac_update_vnode_from_mount");
if (mac_cache_fslabel_in_vnode)
vp->v_vflag |= VV_CACHEDLABEL;
}
/*
* Implementation of VOP_REFRESHLABEL() that relies on extended attributes
* to store label data. Can be referenced by filesystems supporting
* extended attributes.
*/
int
vop_stdrefreshlabel_ea(struct vop_refreshlabel_args *ap)
{
struct vnode *vp = ap->a_vp;
struct mac extmac;
int buflen, error;
ASSERT_VOP_LOCKED(vp, "vop_stdrefreshlabel_ea");
/*
* Call out to external policies first. Order doesn't really
* matter, as long as failure of one assures failure of all.
*/
error = mac_update_vnode_from_extattr(vp, vp->v_mount);
if (error)
return (error);
buflen = sizeof(extmac);
error = vn_extattr_get(vp, IO_NODELOCKED,
FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME, &buflen,
(char *)&extmac, curthread);
switch (error) {
case 0:
/* Got it */
break;
case ENOATTR:
/*
* Use the label from the mount point.
*/
mac_update_vnode_from_mount(vp, vp->v_mount);
return (0);
case EOPNOTSUPP:
default:
/* Fail horribly. */
return (error);
}
if (buflen != sizeof(extmac))
error = EPERM; /* Fail very closed. */
if (error == 0)
error = mac_update_vnode_from_externalized(vp, &extmac);
if (error == 0)
vp->v_vflag |= VV_CACHEDLABEL;
else {
struct vattr va;
printf("Corrupted label on %s",
vp->v_mount->mnt_stat.f_mntonname);
if (VOP_GETATTR(vp, &va, curthread->td_ucred, curthread) == 0)
printf(" inum %ld", va.va_fileid);
if (mac_debug_label_fallback) {
printf(", falling back.\n");
mac_update_vnode_from_mount(vp, vp->v_mount);
error = 0;
} else {
printf(".\n");
error = EPERM;
}
}
return (error);
}
/*
* Make sure the vnode label is up-to-date. If EOPNOTSUPP, then we handle
* the labeling activity outselves. Filesystems should be careful not
* to change their minds regarding whether they support vop_refreshlabel()
* for a vnode or not. Don't cache the vnode here, allow the file
* system code to determine if it's safe to cache. If we update from
* the mount, don't cache since a change to the mount label should affect
* all vnodes.
*/
static int
vn_refreshlabel(struct vnode *vp, struct ucred *cred)
{
int error;
ASSERT_VOP_LOCKED(vp, "vn_refreshlabel");
if (vp->v_mount == NULL) {
/*
Eventually, we probably want to special-case refreshing
of deadfs vnodes, and if there's a lock-free race somewhere,
that case might be handled here.
mac_update_vnode_deadfs(vp);
return (0);
*/
/* printf("vn_refreshlabel: null v_mount\n"); */
if (vp->v_tag != VT_NON)
printf(
"vn_refreshlabel: null v_mount with non-VT_NON\n");
return (EBADF);
}
if (vp->v_vflag & VV_CACHEDLABEL) {
mac_vnode_label_cache_hits++;
return (0);
} else
mac_vnode_label_cache_misses++;
if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
mac_update_vnode_from_mount(vp, vp->v_mount);
return (0);
}
error = VOP_REFRESHLABEL(vp, cred, curthread);
switch (error) {
case EOPNOTSUPP:
/*
* If labels are not supported on this vnode, fall back to
* the label in the mount and propagate it to the vnode.
* There should probably be some sort of policy/flag/decision
* about doing this.
*/
mac_update_vnode_from_mount(vp, vp->v_mount);
error = 0;
default:
return (error);
}
}
/*
* Helper function for file systems using the vop_std*_ea() calls. This
* function must be called after EA service is available for the vnode,
* but before it's hooked up to the namespace so that the node persists
* if there's a crash, or before it can be accessed. On successful
* commit of the label to disk (etc), do cache the label.
*/
int
vop_stdcreatevnode_ea(struct vnode *dvp, struct vnode *tvp, struct ucred *cred)
{
struct mac extmac;
int error;
ASSERT_VOP_LOCKED(tvp, "vop_stdcreatevnode_ea");
if ((dvp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) {
mac_update_vnode_from_mount(tvp, tvp->v_mount);
} else {
error = vn_refreshlabel(dvp, cred);
if (error)
return (error);
/*
* Stick the label in the vnode. Then try to write to
* disk. If we fail, return a failure to abort the
* create operation. Really, this failure shouldn't
* happen except in fairly unusual circumstances (out
* of disk, etc).
*/
mac_create_vnode(cred, dvp, tvp);
error = mac_stdcreatevnode_ea(tvp);
if (error)
return (error);
/*
* XXX: Eventually this will go away and all policies will
* directly manage their extended attributes.
*/
error = mac_externalize(&tvp->v_label, &extmac);
if (error)
return (error);
error = vn_extattr_set(tvp, IO_NODELOCKED,
FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
sizeof(extmac), (char *)&extmac, curthread);
if (error == 0)
tvp->v_vflag |= VV_CACHEDLABEL;
else {
#if 0
/*
* In theory, we could have fall-back behavior here.
* It would probably be incorrect.
*/
#endif
return (error);
}
}
return (0);
}
void
mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
error = vn_refreshlabel(vp, old);
if (error) {
printf("mac_execve_transition: vn_refreshlabel returned %d\n",
error);
printf("mac_execve_transition: using old vnode label\n");
}
MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label);
}
int
mac_execve_will_transition(struct ucred *old, struct vnode *vp)
{
int error, result;
error = vn_refreshlabel(vp, old);
if (error)
return (error);
result = 0;
MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label);
return (result);
}
static void
mac_init_label(struct label *label)
{
bzero(label, sizeof(*label));
label->l_flags = MAC_FLAG_INITIALIZED;
}
static void
mac_init_structmac(struct mac *mac)
{
bzero(mac, sizeof(*mac));
mac->m_macflags = MAC_FLAG_INITIALIZED;
}
static void
mac_destroy_label(struct label *label)
{
KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
("destroying uninitialized label"));
bzero(label, sizeof(*label));
/* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */
}
int
mac_init_mbuf(struct mbuf *m, int how)
{
KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf"));
/* "how" is one of M_(TRY|DONT)WAIT */
mac_init_label(&m->m_pkthdr.label);
MAC_PERFORM(init_mbuf, m, how, &m->m_pkthdr.label);
atomic_add_int(&nmacmbufs, 1);
return (0);
}
void
mac_destroy_mbuf(struct mbuf *m)
{
MAC_PERFORM(destroy_mbuf, m, &m->m_pkthdr.label);
mac_destroy_label(&m->m_pkthdr.label);
atomic_subtract_int(&nmacmbufs, 1);
}
void
mac_init_cred(struct ucred *cr)
{
mac_init_label(&cr->cr_label);
MAC_PERFORM(init_cred, cr, &cr->cr_label);
atomic_add_int(&nmaccreds, 1);
}
void
mac_destroy_cred(struct ucred *cr)
{
MAC_PERFORM(destroy_cred, cr, &cr->cr_label);
mac_destroy_label(&cr->cr_label);
atomic_subtract_int(&nmaccreds, 1);
}
void
mac_init_ifnet(struct ifnet *ifp)
{
mac_init_label(&ifp->if_label);
MAC_PERFORM(init_ifnet, ifp, &ifp->if_label);
atomic_add_int(&nmacifnets, 1);
}
void
mac_destroy_ifnet(struct ifnet *ifp)
{
MAC_PERFORM(destroy_ifnet, ifp, &ifp->if_label);
mac_destroy_label(&ifp->if_label);
atomic_subtract_int(&nmacifnets, 1);
}
void
mac_init_ipq(struct ipq *ipq)
{
mac_init_label(&ipq->ipq_label);
MAC_PERFORM(init_ipq, ipq, &ipq->ipq_label);
atomic_add_int(&nmacipqs, 1);
}
void
mac_destroy_ipq(struct ipq *ipq)
{
MAC_PERFORM(destroy_ipq, ipq, &ipq->ipq_label);
mac_destroy_label(&ipq->ipq_label);
atomic_subtract_int(&nmacipqs, 1);
}
void
mac_init_socket(struct socket *socket)
{
mac_init_label(&socket->so_label);
mac_init_label(&socket->so_peerlabel);
MAC_PERFORM(init_socket, socket, &socket->so_label,
&socket->so_peerlabel);
atomic_add_int(&nmacsockets, 1);
}
void
mac_destroy_socket(struct socket *socket)
{
MAC_PERFORM(destroy_socket, socket, &socket->so_label,
&socket->so_peerlabel);
mac_destroy_label(&socket->so_label);
mac_destroy_label(&socket->so_peerlabel);
atomic_subtract_int(&nmacsockets, 1);
}
void
mac_init_pipe(struct pipe *pipe)
{
struct label *label;
label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK);
mac_init_label(label);
pipe->pipe_label = label;
pipe->pipe_peer->pipe_label = label;
MAC_PERFORM(init_pipe, pipe, pipe->pipe_label);
atomic_add_int(&nmacpipes, 1);
}
void
mac_destroy_pipe(struct pipe *pipe)
{
MAC_PERFORM(destroy_pipe, pipe, pipe->pipe_label);
mac_destroy_label(pipe->pipe_label);
free(pipe->pipe_label, M_MACPIPELABEL);
atomic_subtract_int(&nmacpipes, 1);
}
void
mac_init_bpfdesc(struct bpf_d *bpf_d)
{
mac_init_label(&bpf_d->bd_label);
MAC_PERFORM(init_bpfdesc, bpf_d, &bpf_d->bd_label);
atomic_add_int(&nmacbpfdescs, 1);
}
void
mac_destroy_bpfdesc(struct bpf_d *bpf_d)
{
MAC_PERFORM(destroy_bpfdesc, bpf_d, &bpf_d->bd_label);
mac_destroy_label(&bpf_d->bd_label);
atomic_subtract_int(&nmacbpfdescs, 1);
}
void
mac_init_mount(struct mount *mp)
{
mac_init_label(&mp->mnt_mntlabel);
mac_init_label(&mp->mnt_fslabel);
MAC_PERFORM(init_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel);
atomic_add_int(&nmacmounts, 1);
}
void
mac_destroy_mount(struct mount *mp)
{
MAC_PERFORM(destroy_mount, mp, &mp->mnt_mntlabel, &mp->mnt_fslabel);
mac_destroy_label(&mp->mnt_fslabel);
mac_destroy_label(&mp->mnt_mntlabel);
atomic_subtract_int(&nmacmounts, 1);
}
static void
mac_init_temp(struct label *label)
{
mac_init_label(label);
MAC_PERFORM(init_temp, label);
atomic_add_int(&nmactemp, 1);
}
static void
mac_destroy_temp(struct label *label)
{
MAC_PERFORM(destroy_temp, label);
mac_destroy_label(label);
atomic_subtract_int(&nmactemp, 1);
}
void
mac_init_vnode(struct vnode *vp)
{
mac_init_label(&vp->v_label);
MAC_PERFORM(init_vnode, vp, &vp->v_label);
atomic_add_int(&nmacvnodes, 1);
}
void
mac_destroy_vnode(struct vnode *vp)
{
MAC_PERFORM(destroy_vnode, vp, &vp->v_label);
mac_destroy_label(&vp->v_label);
atomic_subtract_int(&nmacvnodes, 1);
}
void
mac_init_devfsdirent(struct devfs_dirent *de)
{
mac_init_label(&de->de_label);
MAC_PERFORM(init_devfsdirent, de, &de->de_label);
atomic_add_int(&nmacdevfsdirents, 1);
}
void
mac_destroy_devfsdirent(struct devfs_dirent *de)
{
MAC_PERFORM(destroy_devfsdirent, de, &de->de_label);
mac_destroy_label(&de->de_label);
atomic_subtract_int(&nmacdevfsdirents, 1);
}
static int
mac_externalize(struct label *label, struct mac *mac)
{
int error;
mac_init_structmac(mac);
MAC_CHECK(externalize, label, mac);
return (error);
}
static int
mac_internalize(struct label *label, struct mac *mac)
{
int error;
mac_init_temp(label);
MAC_CHECK(internalize, label, mac);
if (error)
mac_destroy_temp(label);
return (error);
}
/*
* Initialize MAC label for the first kernel process, from which other
* kernel processes and threads are spawned.
*/
void
mac_create_proc0(struct ucred *cred)
{
MAC_PERFORM(create_proc0, cred);
}
/*
* Initialize MAC label for the first userland process, from which other
* userland processes and threads are spawned.
*/
void
mac_create_proc1(struct ucred *cred)
{
MAC_PERFORM(create_proc1, cred);
}
/*
* When a new process is created, its label must be initialized. Generally,
* this involves inheritence from the parent process, modulo possible
* deltas. This function allows that processing to take place.
*/
void
mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred)
{
MAC_PERFORM(create_cred, parent_cred, child_cred);
}
int
mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int flags)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, flags);
return (error);
}
int
mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(dvp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label);
return (error);
}
int
mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(dvp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label);
return (error);
}
int
mac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
struct componentname *cnp, struct vattr *vap)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(dvp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap);
return (error);
}
int
mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp,
struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete");
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(dvp, cred);
if (error)
return (error);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp,
&vp->v_label, cnp);
return (error);
}
int
mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
acl_type_t type)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type);
return (error);
}
int
mac_check_vnode_exec(struct ucred *cred, struct vnode *vp)
{
int error;
if (!mac_enforce_process && !mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label);
return (error);
}
int
mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type);
return (error);
}
int
mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
int attrnamespace, const char *name, struct uio *uio)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label,
attrnamespace, name, uio);
return (error);
}
int
mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(dvp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp);
return (error);
}
vm_prot_t
mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp, int newmapping)
{
vm_prot_t result = VM_PROT_ALL;
/*
* This should be some sort of MAC_BITWISE, maybe :)
*/
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_perms");
MAC_BOOLEAN(check_vnode_mmap_perms, &, cred, vp, &vp->v_label,
newmapping);
return (result);
}
int
mac_check_vnode_op(struct ucred *cred, struct vnode *vp, int op)
{
int error;
if (!mac_enforce_fs)
return (0);
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_op");
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_op, cred, vp, &vp->v_label, op);
return (error);
}
int
mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode);
return (error);
}
int
mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(dvp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label);
return (error);
}
int
mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label);
return (error);
}
static int
mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
struct label *newlabel)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel");
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel);
return (error);
}
int
mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
struct vnode *vp, struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from");
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(dvp, cred);
if (error)
return (error);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp,
&vp->v_label, cnp);
return (error);
}
int
mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
struct vnode *vp, int samedir, struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to");
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(dvp, cred);
if (error)
return (error);
if (vp != NULL) {
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
}
MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp,
vp != NULL ? &vp->v_label : NULL, samedir, cnp);
return (error);
}
int
mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label);
return (error);
}
int
mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
struct acl *acl)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl);
return (error);
}
int
mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
int attrnamespace, const char *name, struct uio *uio)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label,
attrnamespace, name, uio);
return (error);
}
int
mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags);
return (error);
}
int
mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode);
return (error);
}
int
mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
gid_t gid)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid);
return (error);
}
int
mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
struct timespec atime, struct timespec mtime)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime,
mtime);
return (error);
}
int
mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
if (!mac_enforce_fs)
return (0);
error = vn_refreshlabel(vp, cred);
if (error)
return (error);
MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
return (error);
}
/*
* When relabeling a process, call out to the policies for the maximum
* permission allowed for each object type we know about in its
* memory space, and revoke access (in the least surprising ways we
* know) when necessary. The process lock is not held here.
*/
static void
mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred)
{
/* XXX freeze all other threads */
mtx_lock(&Giant);
mac_cred_mmapped_drop_perms_recurse(td, cred,
&td->td_proc->p_vmspace->vm_map);
mtx_unlock(&Giant);
/* XXX allow other threads to continue */
}
static __inline const char *
prot2str(vm_prot_t prot)
{
switch (prot & VM_PROT_ALL) {
case VM_PROT_READ:
return ("r--");
case VM_PROT_READ | VM_PROT_WRITE:
return ("rw-");
case VM_PROT_READ | VM_PROT_EXECUTE:
return ("r-x");
case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
return ("rwx");
case VM_PROT_WRITE:
return ("-w-");
case VM_PROT_EXECUTE:
return ("--x");
case VM_PROT_WRITE | VM_PROT_EXECUTE:
return ("-wx");
default:
return ("---");
}
}
static void
mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
struct vm_map *map)
{
struct vm_map_entry *vme;
vm_prot_t result, revokeperms;
vm_object_t object;
vm_ooffset_t offset;
struct vnode *vp;
vm_map_lock_read(map);
for (vme = map->header.next; vme != &map->header; vme = vme->next) {
if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
mac_cred_mmapped_drop_perms_recurse(td, cred,
vme->object.sub_map);
continue;
}
/*
* Skip over entries that obviously are not shared.
*/
if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
!vme->max_protection)
continue;
/*
* Drill down to the deepest backing object.
*/
offset = vme->offset;
object = vme->object.vm_object;
if (object == NULL)
continue;
while (object->backing_object != NULL) {
object = object->backing_object;
offset += object->backing_object_offset;
}
/*
* At the moment, vm_maps and objects aren't considered
* by the MAC system, so only things with backing by a
* normal object (read: vnodes) are checked.
*/
if (object->type != OBJT_VNODE)
continue;
vp = (struct vnode *)object->handle;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
result = mac_check_vnode_mmap_prot(cred, vp, 0);
VOP_UNLOCK(vp, 0, td);
/*
* Find out what maximum protection we may be allowing
* now but a policy needs to get removed.
*/
revokeperms = vme->max_protection & ~result;
if (!revokeperms)
continue;
printf("pid %d: revoking %s perms from %#lx:%d "
"(max %s/cur %s)\n", td->td_proc->p_pid,
prot2str(revokeperms), vme->start, vme->end - vme->start,
prot2str(vme->max_protection), prot2str(vme->protection));
vm_map_lock_upgrade(map);
/*
* This is the really simple case: if a map has more
* max_protection than is allowed, but it's not being
* actually used (that is, the current protection is
* still allowed), we can just wipe it out and do
* nothing more.
*/
if ((vme->protection & revokeperms) == 0) {
vme->max_protection -= revokeperms;
} else {
if (revokeperms & VM_PROT_WRITE) {
/*
* In the more complicated case, flush out all
* pending changes to the object then turn it
* copy-on-write.
*/
vm_object_reference(object);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
vm_object_page_clean(object,
OFF_TO_IDX(offset),
OFF_TO_IDX(offset + vme->end - vme->start +
PAGE_MASK),
OBJPC_SYNC);
VOP_UNLOCK(vp, 0, td);
vm_object_deallocate(object);
/*
* Why bother if there's no read permissions
* anymore? For the rest, we need to leave
* the write permissions on for COW, or
* remove them entirely if configured to.
*/
if (!mac_mmap_revocation_via_cow) {
vme->max_protection &= ~VM_PROT_WRITE;
vme->protection &= ~VM_PROT_WRITE;
} if ((revokeperms & VM_PROT_READ) == 0)
vme->eflags |= MAP_ENTRY_COW |
MAP_ENTRY_NEEDS_COPY;
}
if (revokeperms & VM_PROT_EXECUTE) {
vme->max_protection &= ~VM_PROT_EXECUTE;
vme->protection &= ~VM_PROT_EXECUTE;
}
if (revokeperms & VM_PROT_READ) {
vme->max_protection = 0;
vme->protection = 0;
}
pmap_protect(map->pmap, vme->start, vme->end,
vme->protection & ~revokeperms);
vm_map_simplify_entry(map, vme);
}
vm_map_lock_downgrade(map);
}
vm_map_unlock_read(map);
}
/*
* When the subject's label changes, it may require revocation of privilege
* to mapped objects. This can't be done on-the-fly later with a unified
* buffer cache.
*/
static void
mac_relabel_cred(struct ucred *cred, struct label *newlabel)
{
MAC_PERFORM(relabel_cred, cred, newlabel);
mac_cred_mmapped_drop_perms(curthread, cred);
}
void
mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel)
{
MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel);
}
void
mac_create_ifnet(struct ifnet *ifnet)
{
MAC_PERFORM(create_ifnet, ifnet, &ifnet->if_label);
}
void
mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d)
{
MAC_PERFORM(create_bpfdesc, cred, bpf_d, &bpf_d->bd_label);
}
void
mac_create_socket(struct ucred *cred, struct socket *socket)
{
MAC_PERFORM(create_socket, cred, socket, &socket->so_label);
}
void
mac_create_pipe(struct ucred *cred, struct pipe *pipe)
{
MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_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);
}
static void
mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel)
{
MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel);
}
void
mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket)
{
MAC_PERFORM(set_socket_peer_from_mbuf, mbuf, &mbuf->m_pkthdr.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_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
{
MAC_PERFORM(create_datagram_from_ipq, ipq, &ipq->ipq_label,
datagram, &datagram->m_pkthdr.label);
}
void
mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
{
MAC_PERFORM(create_fragment, datagram, &datagram->m_pkthdr.label,
fragment, &fragment->m_pkthdr.label);
}
void
mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
{
MAC_PERFORM(create_ipq, fragment, &fragment->m_pkthdr.label, ipq,
&ipq->ipq_label);
}
void
mac_create_mbuf_from_mbuf(struct mbuf *oldmbuf, struct mbuf *newmbuf)
{
MAC_PERFORM(create_mbuf_from_mbuf, oldmbuf, &oldmbuf->m_pkthdr.label,
newmbuf, &newmbuf->m_pkthdr.label);
}
void
mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
{
MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, &bpf_d->bd_label, mbuf,
&mbuf->m_pkthdr.label);
}
void
mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf)
{
MAC_PERFORM(create_mbuf_linklayer, ifnet, &ifnet->if_label, mbuf,
&mbuf->m_pkthdr.label);
}
void
mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf)
{
MAC_PERFORM(create_mbuf_from_ifnet, ifnet, &ifnet->if_label, mbuf,
&mbuf->m_pkthdr.label);
}
void
mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet,
struct mbuf *newmbuf)
{
MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf,
&oldmbuf->m_pkthdr.label, ifnet, &ifnet->if_label, newmbuf,
&newmbuf->m_pkthdr.label);
}
void
mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
{
MAC_PERFORM(create_mbuf_netlayer, oldmbuf, &oldmbuf->m_pkthdr.label,
newmbuf, &newmbuf->m_pkthdr.label);
}
int
mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
{
int result;
result = 1;
MAC_BOOLEAN(fragment_match, &&, fragment, &fragment->m_pkthdr.label,
ipq, &ipq->ipq_label);
return (result);
}
void
mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
{
MAC_PERFORM(update_ipq, fragment, &fragment->m_pkthdr.label, ipq,
&ipq->ipq_label);
}
void
mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf)
{
MAC_PERFORM(create_mbuf_from_socket, socket, &socket->so_label, mbuf,
&mbuf->m_pkthdr.label);
}
void
mac_create_mount(struct ucred *cred, struct mount *mp)
{
MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel,
&mp->mnt_fslabel);
}
void
mac_create_root_mount(struct ucred *cred, struct mount *mp)
{
MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel,
&mp->mnt_fslabel);
}
int
mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet)
{
int error;
if (!mac_enforce_network)
return (0);
MAC_CHECK(check_bpfdesc_receive, bpf_d, &bpf_d->bd_label, ifnet,
&ifnet->if_label);
return (error);
}
static int
mac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
{
int error;
MAC_CHECK(check_cred_relabel, cred, newlabel);
return (error);
}
int
mac_check_cred_visible(struct ucred *u1, struct ucred *u2)
{
int error;
if (!mac_enforce_process)
return (0);
MAC_CHECK(check_cred_visible, u1, u2);
return (error);
}
int
mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf)
{
int error;
if (!mac_enforce_network)
return (0);
KASSERT(mbuf->m_flags & M_PKTHDR, ("packet has no pkthdr"));
if (!(mbuf->m_pkthdr.label.l_flags & MAC_FLAG_INITIALIZED))
printf("%s%d: not initialized\n", ifnet->if_name,
ifnet->if_unit);
MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf,
&mbuf->m_pkthdr.label);
return (error);
}
int
mac_check_mount_stat(struct ucred *cred, struct mount *mount)
{
int error;
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel);
return (error);
}
int
mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd,
void *data)
{
int error;
MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
return (error);
}
int
mac_check_pipe_op(struct ucred *cred, struct pipe *pipe, int op)
{
int error;
MAC_CHECK(check_pipe_op, cred, pipe, pipe->pipe_label, op);
return (error);
}
static int
mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
struct label *newlabel)
{
int error;
MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
return (error);
}
int
mac_check_proc_debug(struct ucred *cred, struct proc *proc)
{
int error;
if (!mac_enforce_process)
return (0);
MAC_CHECK(check_proc_debug, cred, proc);
return (error);
}
int
mac_check_proc_sched(struct ucred *cred, struct proc *proc)
{
int error;
if (!mac_enforce_process)
return (0);
MAC_CHECK(check_proc_sched, cred, proc);
return (error);
}
int
mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
{
int error;
if (!mac_enforce_process)
return (0);
MAC_CHECK(check_proc_signal, cred, proc, signum);
return (error);
}
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_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 socket *socket, struct mbuf *mbuf)
{
int error;
if (!mac_enforce_socket)
return (0);
MAC_CHECK(check_socket_receive, socket, &socket->so_label, mbuf,
&mbuf->m_pkthdr.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_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_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
struct ifnet *ifnet)
{
struct mac label;
int error;
error = mac_externalize(&ifnet->if_label, &label);
if (error)
return (error);
return (copyout(&label, ifr->ifr_ifru.ifru_data, sizeof(label)));
}
int
mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
struct ifnet *ifnet)
{
struct mac newlabel;
struct label intlabel;
int error;
error = copyin(ifr->ifr_ifru.ifru_data, &newlabel, sizeof(newlabel));
if (error)
return (error);
error = mac_internalize(&intlabel, &newlabel);
if (error)
return (error);
/*
* XXX: Note that this is a redundant privilege check, since
* policies impose this check themselves if required by the
* policy. Eventually, this should go away.
*/
error = suser_cred(cred, 0);
if (error)
goto out;
MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label,
&intlabel);
if (error)
goto out;
MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel);
out:
mac_destroy_temp(&intlabel);
return (error);
}
void
mac_create_devfs_vnode(struct devfs_dirent *de, struct vnode *vp)
{
MAC_PERFORM(create_devfs_vnode, de, &de->de_label, vp, &vp->v_label);
}
void
mac_create_devfs_device(dev_t dev, struct devfs_dirent *de)
{
MAC_PERFORM(create_devfs_device, dev, de, &de->de_label);
}
static int
mac_stdcreatevnode_ea(struct vnode *vp)
{
int error;
MAC_CHECK(stdcreatevnode_ea, vp, &vp->v_label);
return (error);
}
void
mac_create_devfs_directory(char *dirname, int dirnamelen,
struct devfs_dirent *de)
{
MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de,
&de->de_label);
}
/*
* When a new vnode is created, this call will initialize its label.
*/
void
mac_create_vnode(struct ucred *cred, struct vnode *parent,
struct vnode *child)
{
int error;
ASSERT_VOP_LOCKED(parent, "mac_create_vnode");
ASSERT_VOP_LOCKED(child, "mac_create_vnode");
error = vn_refreshlabel(parent, cred);
if (error) {
printf("mac_create_vnode: vn_refreshlabel returned %d\n",
error);
printf("mac_create_vnode: using old vnode label\n");
}
MAC_PERFORM(create_vnode, cred, parent, &parent->v_label, child,
&child->v_label);
}
int
mac_setsockopt_label_set(struct ucred *cred, struct socket *so,
struct mac *extmac)
{
struct label intlabel;
int error;
error = mac_internalize(&intlabel, extmac);
if (error)
return (error);
mac_check_socket_relabel(cred, so, &intlabel);
if (error) {
mac_destroy_temp(&intlabel);
return (error);
}
mac_relabel_socket(cred, so, &intlabel);
mac_destroy_temp(&intlabel);
return (0);
}
int
mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
{
int error;
error = mac_check_pipe_relabel(cred, pipe, label);
if (error)
return (error);
mac_relabel_pipe(cred, pipe, label);
return (0);
}
int
mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
struct mac *extmac)
{
return (mac_externalize(&so->so_label, extmac));
}
int
mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
struct mac *extmac)
{
return (mac_externalize(&so->so_peerlabel, extmac));
}
/*
* Implementation of VOP_SETLABEL() that relies on extended attributes
* to store label data. Can be referenced by filesystems supporting
* extended attributes.
*/
int
vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
{
struct vnode *vp = ap->a_vp;
struct label *intlabel = ap->a_label;
struct mac extmac;
int error;
ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
/*
* XXX: Eventually call out to EA check/set calls here.
* Be particularly careful to avoid race conditions,
* consistency problems, and stability problems when
* dealing with multiple EAs. In particular, we require
* the ability to write multiple EAs on the same file in
* a single transaction, which the current EA interface
* does not provide.
*/
error = mac_externalize(intlabel, &extmac);
if (error)
return (error);
error = vn_extattr_set(vp, IO_NODELOCKED,
FREEBSD_MAC_EXTATTR_NAMESPACE, FREEBSD_MAC_EXTATTR_NAME,
sizeof(extmac), (char *)&extmac, curthread);
if (error)
return (error);
mac_relabel_vnode(ap->a_cred, vp, intlabel);
vp->v_vflag |= VV_CACHEDLABEL;
return (0);
}
static int
vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
{
int error;
if (vp->v_mount == NULL) {
/* printf("vn_setlabel: null v_mount\n"); */
if (vp->v_tag != VT_NON)
printf("vn_setlabel: null v_mount with non-VT_NON\n");
return (EBADF);
}
if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
return (EOPNOTSUPP);
/*
* Multi-phase commit. First check the policies to confirm the
* change is OK. Then commit via the filesystem. Finally,
* update the actual vnode label. Question: maybe the filesystem
* should update the vnode at the end as part of VOP_SETLABEL()?
*/
error = mac_check_vnode_relabel(cred, vp, intlabel);
if (error)
return (error);
/*
* VADMIN provides the opportunity for the filesystem to make
* decisions about who is and is not able to modify labels
* and protections on files. This might not be right. We can't
* assume VOP_SETLABEL() will do it, because we might implement
* that as part of vop_stdsetlabel_ea().
*/
error = VOP_ACCESS(vp, VADMIN, cred, curthread);
if (error)
return (error);
error = VOP_SETLABEL(vp, intlabel, cred, curthread);
if (error)
return (error);
return (0);
}
/*
* MPSAFE
*/
int
__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
{
struct mac extmac;
int error;
error = mac_externalize(&td->td_ucred->cr_label, &extmac);
if (error == 0)
error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
return (error);
}
/*
* MPSAFE
*
* XXX: Needs to be re-written for proc locking.
*/
int
__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
{
struct ucred *newcred, *oldcred;
struct proc *p;
struct mac extmac;
struct label intlabel;
int error;
error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
if (error)
return (error);
error = mac_internalize(&intlabel, &extmac);
if (error)
return (error);
newcred = crget();
p = td->td_proc;
PROC_LOCK(p);
oldcred = p->p_ucred;
error = mac_check_cred_relabel(oldcred, &intlabel);
if (error) {
PROC_UNLOCK(p);
mac_destroy_temp(&intlabel);
crfree(newcred);
return (error);
}
setsugid(p);
crcopy(newcred, oldcred);
PROC_UNLOCK(p);
mac_relabel_cred(newcred, &intlabel);
PROC_LOCK(p);
p->p_ucred = newcred;
PROC_UNLOCK(p);
crfree(oldcred);
mac_destroy_temp(&intlabel);
return (0);
}
/*
* MPSAFE
*/
int
__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
{
struct file *fp;
struct mac extmac;
struct vnode *vp;
struct pipe *pipe;
int error;
mtx_lock(&Giant);
error = fget(td, SCARG(uap, fd), &fp);
if (error)
goto out;
switch (fp->f_type) {
case DTYPE_FIFO:
case DTYPE_VNODE:
vp = (struct vnode *)fp->f_data;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
error = vn_refreshlabel(vp, td->td_ucred);
if (error == 0)
error = mac_externalize(&vp->v_label, &extmac);
VOP_UNLOCK(vp, 0, td);
break;
case DTYPE_PIPE:
pipe = (struct pipe *)fp->f_data;
error = mac_externalize(pipe->pipe_label, &extmac);
break;
default:
error = EINVAL;
}
if (error == 0)
error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
fdrop(fp, td);
out:
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
int
__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
{
struct nameidata nd;
struct mac extmac;
int error;
mtx_lock(&Giant);
NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
SCARG(uap, path_p), td);
error = namei(&nd);
if (error)
goto out;
error = vn_refreshlabel(nd.ni_vp, td->td_ucred);
if (error == 0)
error = mac_externalize(&nd.ni_vp->v_label, &extmac);
NDFREE(&nd, 0);
if (error)
goto out;
error = copyout(&extmac, SCARG(uap, mac_p), sizeof(extmac));
out:
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
int
__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
{
struct file *fp;
struct mac extmac;
struct label intlabel;
struct mount *mp;
struct vnode *vp;
struct pipe *pipe;
int error;
mtx_lock(&Giant);
error = fget(td, SCARG(uap, fd), &fp);
if (error)
goto out1;
error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
if (error)
goto out2;
error = mac_internalize(&intlabel, &extmac);
if (error)
goto out2;
switch (fp->f_type) {
case DTYPE_FIFO:
case DTYPE_VNODE:
vp = (struct vnode *)fp->f_data;
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
if (error != 0)
break;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
error = vn_setlabel(vp, &intlabel, td->td_ucred);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
mac_destroy_temp(&intlabel);
break;
case DTYPE_PIPE:
pipe = (struct pipe *)fp->f_data;
error = mac_pipe_label_set(td->td_ucred, pipe, &intlabel);
break;
default:
error = EINVAL;
}
out2:
fdrop(fp, td);
out1:
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
int
__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
{
struct nameidata nd;
struct mac extmac;
struct label intlabel;
struct mount *mp;
int error;
mtx_lock(&Giant);
error = copyin(SCARG(uap, mac_p), &extmac, sizeof(extmac));
if (error)
goto out;
error = mac_internalize(&intlabel, &extmac);
if (error)
goto out;
NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE,
SCARG(uap, path_p), td);
error = namei(&nd);
if (error)
goto out2;
error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
if (error)
goto out2;
error = vn_setlabel(nd.ni_vp, &intlabel, td->td_ucred);
vn_finished_write(mp);
out2:
mac_destroy_temp(&intlabel);
NDFREE(&nd, 0);
out:
mtx_unlock(&Giant);
return (error);
}
SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL);
SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL);
#else /* !MAC */
int
__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
{
return (ENOSYS);
}
int
__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
{
return (ENOSYS);
}
int
__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
{
return (ENOSYS);
}
int
__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
{
return (ENOSYS);
}
int
__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
{
return (ENOSYS);
}
int
__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
{
return (ENOSYS);
}
#endif /* !MAC */
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