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freebsd-skq/sys/kern/kern_mac.c
rwatson 569048d3f9 Introduce p_label, extensible security label storage for the MAC framework 
in struct proc.  While the process label is actually stored in the
struct ucred pointed to by p_ucred, there is a need for transient
storage that may be used when asynchronous (deferred) updates need to
be performed on the "real" label for locking reasons.  Unlike other
label storage, this label has no locking semantics, relying on policies
to provide their own protection for the label contents, meaning that
a policy leaf mutex may be used, avoiding lock order issues.  This
permits policies that act based on historical process behavior (such
as audit policies, the MAC Framework port of LOMAC, etc) can update
process properties even when many existing locks are held without
violating the lock order.  No currently committed policies implement use
of this label storage.

Approved by:	re
Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories
2002-11-20 15:41:25 +00:00

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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 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.
*
* $FreeBSD$
*/
/*
* 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 "opt_devfs.h"
#include <sys/param.h>
#include <sys/condvar.h>
#include <sys/extattr.h>
#include <sys/imgact.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.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/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/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");
#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, "");
/*
* Has the kernel started generating labeled objects yet? All read/write
* access to this variable is serialized during the boot process. Following
* the end of serialization, we don't update this flag; no locking.
*/
static int mac_late = 0;
/*
* Warn about EA transactions only the first time they happen.
* Weak coherency, no locking.
*/
static int ea_warn_once = 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_kld = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_kld, CTLFLAG_RW,
&mac_enforce_kld, 0, "Enforce MAC policy on kld operations");
TUNABLE_INT("security.mac.enforce_kld", &mac_enforce_kld);
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_pipe = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
&mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe);
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_system = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_system, CTLFLAG_RW,
&mac_enforce_system, 0, "Enforce MAC policy on system operations");
TUNABLE_INT("security.mac.enforce_system", &mac_enforce_system);
static int mac_enforce_vm = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW,
&mac_enforce_vm, 0, "Enforce MAC policy on vm operations");
TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm);
static int mac_mmap_revocation = 1;
SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW,
&mac_mmap_revocation, 0, "Revoke mmap access to files on subject "
"relabel");
static int mac_mmap_revocation_via_cow = 0;
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");
#ifdef MAC_DEBUG
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);
SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0,
"TrustedBSD MAC object counters");
static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs,
nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents,
nmacipqs, nmacpipes, nmacprocs;
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD,
&nmacmbufs, 0, "number of mbufs in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD,
&nmaccreds, 0, "number of ucreds in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD,
&nmacifnets, 0, "number of ifnets in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD,
&nmacipqs, 0, "number of ipqs in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD,
&nmacbpfdescs, 0, "number of bpfdescs in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD,
&nmacsockets, 0, "number of sockets in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD,
&nmacpipes, 0, "number of pipes in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, procs, CTLFLAG_RD,
&nmacprocs, 0, "number of procs in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD,
&nmacmounts, 0, "number of mounts in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD,
&nmactemp, 0, "number of temporary labels in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD,
&nmacvnodes, 0, "number of vnodes in use");
SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD,
&nmacdevfsdirents, 0, "number of devfs dirents inuse");
#endif
static int error_select(int error1, int error2);
static int mac_policy_register(struct mac_policy_conf *mpc);
static int mac_policy_unregister(struct mac_policy_conf *mpc);
static void mac_check_vnode_mmap_downgrade(struct ucred *cred,
struct vnode *vp, int *prot);
static void mac_cred_mmapped_drop_perms_recurse(struct thread *td,
struct ucred *cred, struct vm_map *map);
static void mac_destroy_socket_label(struct label *label);
static int mac_setlabel_vnode_extattr(struct ucred *cred,
struct vnode *vp, struct label *intlabel);
MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes");
MALLOC_DEFINE(M_MACTEMP, "mactemp", "MAC temporary label storage");
/*
* mac_policy_list stores the list of active policies. A busy count is
* maintained for the list, stored in mac_policy_busy. The busy count
* is protected by mac_policy_list_lock; the list may be modified only
* while the busy count is 0, requiring that the lock be held to
* prevent new references to the list from being acquired. For almost
* all operations, incrementing the busy count is sufficient to
* guarantee consistency, as the list cannot be modified while the
* busy count is elevated. For a few special operations involving a
* change to the list of active policies, the lock itself must be held.
* A condition variable, mac_policy_list_not_busy, is used to signal
* potential exclusive consumers that they should try to acquire the
* lock if a first attempt at exclusive access fails.
*/
static struct mtx mac_policy_list_lock;
static struct cv mac_policy_list_not_busy;
static LIST_HEAD(, mac_policy_conf) mac_policy_list;
static int mac_policy_list_busy;
#define MAC_POLICY_LIST_LOCKINIT() do { \
mtx_init(&mac_policy_list_lock, "mac_policy_list_lock", NULL, \
MTX_DEF); \
cv_init(&mac_policy_list_not_busy, "mac_policy_list_not_busy"); \
} while (0)
#define MAC_POLICY_LIST_LOCK() do { \
mtx_lock(&mac_policy_list_lock); \
} while (0)
#define MAC_POLICY_LIST_UNLOCK() do { \
mtx_unlock(&mac_policy_list_lock); \
} while (0)
/*
* We manually invoke WITNESS_SLEEP() to allow Witness to generate
* warnings even if we don't end up ever triggering the wait at
* run-time. The consumer of the exclusive interface must not hold
* any locks (other than potentially Giant) since we may sleep for
* long (potentially indefinite) periods of time waiting for the
* framework to become quiescent so that a policy list change may
* be made.
*/
#define MAC_POLICY_LIST_EXCLUSIVE() do { \
WITNESS_SLEEP(1, NULL); \
mtx_lock(&mac_policy_list_lock); \
while (mac_policy_list_busy != 0) \
cv_wait(&mac_policy_list_not_busy, \
&mac_policy_list_lock); \
} while (0)
#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--; \
KASSERT(mac_policy_list_busy >= 0, ("MAC_POLICY_LIST_LOCK")); \
if (mac_policy_list_busy == 0) \
cv_signal(&mac_policy_list_not_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)
#define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \
outbuflen) do { \
char *curptr, *curptr_start, *element_name, *element_temp; \
size_t left, left_start, len; \
int claimed, first, first_start, ignorenotfound; \
\
error = 0; \
element_temp = elementlist; \
curptr = outbuf; \
curptr[0] = '\0'; \
left = outbuflen; \
first = 1; \
while ((element_name = strsep(&element_temp, ",")) != NULL) { \
curptr_start = curptr; \
left_start = left; \
first_start = first; \
if (element_name[0] == '?') { \
element_name++; \
ignorenotfound = 1; \
} else \
ignorenotfound = 0; \
claimed = 0; \
if (first) { \
len = snprintf(curptr, left, "%s/", \
element_name); \
first = 0; \
} else \
len = snprintf(curptr, left, ",%s/", \
element_name); \
if (len >= left) { \
error = EINVAL; /* XXXMAC: E2BIG */ \
break; \
} \
curptr += len; \
left -= len; \
\
MAC_CHECK(externalize_ ## type, label, element_name, \
curptr, left, &len, &claimed); \
if (error) \
break; \
if (claimed == 1) { \
if (len >= outbuflen) { \
error = EINVAL; /* XXXMAC: E2BIG */ \
break; \
} \
curptr += len; \
left -= len; \
} else if (claimed == 0 && ignorenotfound) { \
/* \
* Revert addition of the label element \
* name. \
*/ \
curptr = curptr_start; \
*curptr = '\0'; \
left = left_start; \
first = first_start; \
} else { \
error = EINVAL; /* XXXMAC: ENOLABEL */ \
break; \
} \
} \
} while (0)
#define MAC_INTERNALIZE(type, label, instring) do { \
char *element, *element_name, *element_data; \
int claimed; \
\
error = 0; \
element = instring; \
while ((element_name = strsep(&element, ",")) != NULL) { \
element_data = element_name; \
element_name = strsep(&element_data, "/"); \
if (element_data == NULL) { \
error = EINVAL; \
break; \
} \
claimed = 0; \
MAC_CHECK(internalize_ ## type, label, element_name, \
element_data, &claimed); \
if (error) \
break; \
if (claimed != 1) { \
/* XXXMAC: Another error here? */ \
error = EINVAL; \
break; \
} \
} \
} 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;
int slot;
MAC_POLICY_LIST_EXCLUSIVE();
LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) {
if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) {
MAC_POLICY_LIST_UNLOCK();
return (EEXIST);
}
}
if (mpc->mpc_field_off != NULL) {
slot = ffs(mac_policy_offsets_free);
if (slot == 0) {
MAC_POLICY_LIST_UNLOCK();
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 we fail the load, we may get a request to unload. Check
* to see if we did the run-time registration, and if not,
* silently succeed.
*/
MAC_POLICY_LIST_EXCLUSIVE();
if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) {
MAC_POLICY_LIST_UNLOCK();
return (0);
}
#if 0
/*
* Don't allow unloading modules with private data.
*/
if (mpc->mpc_field_off != NULL) {
MAC_POLICY_LIST_UNLOCK();
return (EBUSY);
}
#endif
/*
* Only allow the unload to proceed if the module is unloadable
* by its own definition.
*/
if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 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);
mpc->mpc_runtime_flags &= ~MPC_RUNTIME_FLAG_REGISTERED;
MAC_POLICY_LIST_UNLOCK();
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);
}
static void
mac_init_label(struct label *label)
{
bzero(label, sizeof(*label));
label->l_flags = 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; */
}
void
mac_init_bpfdesc(struct bpf_d *bpf_d)
{
mac_init_label(&bpf_d->bd_label);
MAC_PERFORM(init_bpfdesc_label, &bpf_d->bd_label);
#ifdef MAC_DEBUG
atomic_add_int(&nmacbpfdescs, 1);
#endif
}
static void
mac_init_cred_label(struct label *label)
{
mac_init_label(label);
MAC_PERFORM(init_cred_label, label);
#ifdef MAC_DEBUG
atomic_add_int(&nmaccreds, 1);
#endif
}
void
mac_init_cred(struct ucred *cred)
{
mac_init_cred_label(&cred->cr_label);
}
void
mac_init_devfsdirent(struct devfs_dirent *de)
{
mac_init_label(&de->de_label);
MAC_PERFORM(init_devfsdirent_label, &de->de_label);
#ifdef MAC_DEBUG
atomic_add_int(&nmacdevfsdirents, 1);
#endif
}
static void
mac_init_ifnet_label(struct label *label)
{
mac_init_label(label);
MAC_PERFORM(init_ifnet_label, label);
#ifdef MAC_DEBUG
atomic_add_int(&nmacifnets, 1);
#endif
}
void
mac_init_ifnet(struct ifnet *ifp)
{
mac_init_ifnet_label(&ifp->if_label);
}
void
mac_init_ipq(struct ipq *ipq)
{
mac_init_label(&ipq->ipq_label);
MAC_PERFORM(init_ipq_label, &ipq->ipq_label);
#ifdef MAC_DEBUG
atomic_add_int(&nmacipqs, 1);
#endif
}
int
mac_init_mbuf(struct mbuf *m, int flag)
{
int error;
KASSERT(m->m_flags & M_PKTHDR, ("mac_init_mbuf on non-header mbuf"));
mac_init_label(&m->m_pkthdr.label);
MAC_CHECK(init_mbuf_label, &m->m_pkthdr.label, flag);
if (error) {
MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
mac_destroy_label(&m->m_pkthdr.label);
}
#ifdef MAC_DEBUG
if (error == 0)
atomic_add_int(&nmacmbufs, 1);
#endif
return (error);
}
void
mac_init_mount(struct mount *mp)
{
mac_init_label(&mp->mnt_mntlabel);
mac_init_label(&mp->mnt_fslabel);
MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel);
MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel);
#ifdef MAC_DEBUG
atomic_add_int(&nmacmounts, 1);
#endif
}
static void
mac_init_pipe_label(struct label *label)
{
mac_init_label(label);
MAC_PERFORM(init_pipe_label, label);
#ifdef MAC_DEBUG
atomic_add_int(&nmacpipes, 1);
#endif
}
void
mac_init_pipe(struct pipe *pipe)
{
struct label *label;
label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK);
pipe->pipe_label = label;
pipe->pipe_peer->pipe_label = label;
mac_init_pipe_label(label);
}
void
mac_init_proc(struct proc *p)
{
mac_init_label(&p->p_label);
MAC_PERFORM(init_proc_label, &p->p_label);
#ifdef MAC_DEBUG
atomic_add_int(&nmacprocs, 1);
#endif
}
static int
mac_init_socket_label(struct label *label, int flag)
{
int error;
mac_init_label(label);
MAC_CHECK(init_socket_label, label, flag);
if (error) {
MAC_PERFORM(destroy_socket_label, label);
mac_destroy_label(label);
}
#ifdef MAC_DEBUG
if (error == 0)
atomic_add_int(&nmacsockets, 1);
#endif
return (error);
}
static int
mac_init_socket_peer_label(struct label *label, int flag)
{
int error;
mac_init_label(label);
MAC_CHECK(init_socket_peer_label, label, flag);
if (error) {
MAC_PERFORM(destroy_socket_label, label);
mac_destroy_label(label);
}
return (error);
}
int
mac_init_socket(struct socket *socket, int flag)
{
int error;
error = mac_init_socket_label(&socket->so_label, flag);
if (error)
return (error);
error = mac_init_socket_peer_label(&socket->so_peerlabel, flag);
if (error)
mac_destroy_socket_label(&socket->so_label);
return (error);
}
void
mac_init_vnode_label(struct label *label)
{
mac_init_label(label);
MAC_PERFORM(init_vnode_label, label);
#ifdef MAC_DEBUG
atomic_add_int(&nmacvnodes, 1);
#endif
}
void
mac_init_vnode(struct vnode *vp)
{
mac_init_vnode_label(&vp->v_label);
}
void
mac_destroy_bpfdesc(struct bpf_d *bpf_d)
{
MAC_PERFORM(destroy_bpfdesc_label, &bpf_d->bd_label);
mac_destroy_label(&bpf_d->bd_label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacbpfdescs, 1);
#endif
}
static void
mac_destroy_cred_label(struct label *label)
{
MAC_PERFORM(destroy_cred_label, label);
mac_destroy_label(label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmaccreds, 1);
#endif
}
void
mac_destroy_cred(struct ucred *cred)
{
mac_destroy_cred_label(&cred->cr_label);
}
void
mac_destroy_devfsdirent(struct devfs_dirent *de)
{
MAC_PERFORM(destroy_devfsdirent_label, &de->de_label);
mac_destroy_label(&de->de_label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacdevfsdirents, 1);
#endif
}
static void
mac_destroy_ifnet_label(struct label *label)
{
MAC_PERFORM(destroy_ifnet_label, label);
mac_destroy_label(label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacifnets, 1);
#endif
}
void
mac_destroy_ifnet(struct ifnet *ifp)
{
mac_destroy_ifnet_label(&ifp->if_label);
}
void
mac_destroy_ipq(struct ipq *ipq)
{
MAC_PERFORM(destroy_ipq_label, &ipq->ipq_label);
mac_destroy_label(&ipq->ipq_label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacipqs, 1);
#endif
}
void
mac_destroy_mbuf(struct mbuf *m)
{
MAC_PERFORM(destroy_mbuf_label, &m->m_pkthdr.label);
mac_destroy_label(&m->m_pkthdr.label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacmbufs, 1);
#endif
}
void
mac_destroy_mount(struct mount *mp)
{
MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel);
MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel);
mac_destroy_label(&mp->mnt_fslabel);
mac_destroy_label(&mp->mnt_mntlabel);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacmounts, 1);
#endif
}
static void
mac_destroy_pipe_label(struct label *label)
{
MAC_PERFORM(destroy_pipe_label, label);
mac_destroy_label(label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacpipes, 1);
#endif
}
void
mac_destroy_pipe(struct pipe *pipe)
{
mac_destroy_pipe_label(pipe->pipe_label);
free(pipe->pipe_label, M_MACPIPELABEL);
}
void
mac_destroy_proc(struct proc *p)
{
MAC_PERFORM(destroy_proc_label, &p->p_label);
mac_destroy_label(&p->p_label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacprocs, 1);
#endif
}
static void
mac_destroy_socket_label(struct label *label)
{
MAC_PERFORM(destroy_socket_label, label);
mac_destroy_label(label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacsockets, 1);
#endif
}
static void
mac_destroy_socket_peer_label(struct label *label)
{
MAC_PERFORM(destroy_socket_peer_label, label);
mac_destroy_label(label);
}
void
mac_destroy_socket(struct socket *socket)
{
mac_destroy_socket_label(&socket->so_label);
mac_destroy_socket_peer_label(&socket->so_peerlabel);
}
void
mac_destroy_vnode_label(struct label *label)
{
MAC_PERFORM(destroy_vnode_label, label);
mac_destroy_label(label);
#ifdef MAC_DEBUG
atomic_subtract_int(&nmacvnodes, 1);
#endif
}
void
mac_destroy_vnode(struct vnode *vp)
{
mac_destroy_vnode_label(&vp->v_label);
}
static void
mac_copy_pipe_label(struct label *src, struct label *dest)
{
MAC_PERFORM(copy_pipe_label, src, dest);
}
void
mac_copy_vnode_label(struct label *src, struct label *dest)
{
MAC_PERFORM(copy_vnode_label, src, dest);
}
static int
mac_check_structmac_consistent(struct mac *mac)
{
if (mac->m_buflen > MAC_MAX_LABEL_BUF_LEN)
return (EINVAL);
return (0);
}
static int
mac_externalize_cred_label(struct label *label, char *elements,
char *outbuf, size_t outbuflen, int flags)
{
int error;
MAC_EXTERNALIZE(cred_label, label, elements, outbuf, outbuflen);
return (error);
}
static int
mac_externalize_ifnet_label(struct label *label, char *elements,
char *outbuf, size_t outbuflen, int flags)
{
int error;
MAC_EXTERNALIZE(ifnet_label, label, elements, outbuf, outbuflen);
return (error);
}
static int
mac_externalize_pipe_label(struct label *label, char *elements,
char *outbuf, size_t outbuflen, int flags)
{
int error;
MAC_EXTERNALIZE(pipe_label, label, elements, outbuf, outbuflen);
return (error);
}
static int
mac_externalize_socket_label(struct label *label, char *elements,
char *outbuf, size_t outbuflen, int flags)
{
int error;
MAC_EXTERNALIZE(socket_label, label, elements, outbuf, outbuflen);
return (error);
}
static int
mac_externalize_socket_peer_label(struct label *label, char *elements,
char *outbuf, size_t outbuflen, int flags)
{
int error;
MAC_EXTERNALIZE(socket_peer_label, label, elements, outbuf, outbuflen);
return (error);
}
static int
mac_externalize_vnode_label(struct label *label, char *elements,
char *outbuf, size_t outbuflen, int flags)
{
int error;
MAC_EXTERNALIZE(vnode_label, label, elements, outbuf, outbuflen);
return (error);
}
static int
mac_internalize_cred_label(struct label *label, char *string)
{
int error;
MAC_INTERNALIZE(cred_label, label, string);
return (error);
}
static int
mac_internalize_ifnet_label(struct label *label, char *string)
{
int error;
MAC_INTERNALIZE(ifnet_label, label, string);
return (error);
}
static int
mac_internalize_pipe_label(struct label *label, char *string)
{
int error;
MAC_INTERNALIZE(pipe_label, label, string);
return (error);
}
static int
mac_internalize_socket_label(struct label *label, char *string)
{
int error;
MAC_INTERNALIZE(socket_label, label, string);
return (error);
}
static int
mac_internalize_vnode_label(struct label *label, char *string)
{
int error;
MAC_INTERNALIZE(vnode_label, label, string);
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);
}
void
mac_thread_userret(struct thread *td)
{
MAC_PERFORM(thread_userret, td);
}
/*
* 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);
}
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_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de,
struct vnode *vp)
{
MAC_PERFORM(associate_vnode_devfs, mp, &mp->mnt_fslabel, de,
&de->de_label, vp, &vp->v_label);
}
int
mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr");
MAC_CHECK(associate_vnode_extattr, mp, &mp->mnt_fslabel, vp,
&vp->v_label);
return (error);
}
void
mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp)
{
MAC_PERFORM(associate_vnode_singlelabel, mp, &mp->mnt_fslabel, vp,
&vp->v_label);
}
int
mac_create_vnode_extattr(struct ucred *cred, struct mount *mp,
struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr");
ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr");
error = VOP_OPENEXTATTR(vp, cred, curthread);
if (error == EOPNOTSUPP) {
/* XXX: Optionally abort if transactions not supported. */
if (ea_warn_once == 0) {
printf("Warning: transactions not supported "
"in EA write.\n");
ea_warn_once = 1;
}
} else if (error)
return (error);
MAC_CHECK(create_vnode_extattr, cred, mp, &mp->mnt_fslabel,
dvp, &dvp->v_label, vp, &vp->v_label, cnp);
if (error) {
VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
return (error);
}
error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
if (error == EOPNOTSUPP)
error = 0; /* XXX */
return (error);
}
static int
mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp,
struct label *intlabel)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr");
error = VOP_OPENEXTATTR(vp, cred, curthread);
if (error == EOPNOTSUPP) {
/* XXX: Optionally abort if transactions not supported. */
if (ea_warn_once == 0) {
printf("Warning: transactions not supported "
"in EA write.\n");
ea_warn_once = 1;
}
} else if (error)
return (error);
MAC_CHECK(setlabel_vnode_extattr, cred, vp, &vp->v_label, intlabel);
if (error) {
VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
return (error);
}
error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
if (error == EOPNOTSUPP)
error = 0; /* XXX */
return (error);
}
int
mac_execve_enter(struct image_params *imgp, struct mac *mac_p,
struct label *execlabelstorage)
{
struct mac mac;
char *buffer;
int error;
if (mac_p == NULL)
return (0);
error = copyin(mac_p, &mac, sizeof(mac));
if (error)
return (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);
}
mac_init_cred_label(execlabelstorage);
error = mac_internalize_cred_label(execlabelstorage, buffer);
free(buffer, M_MACTEMP);
if (error) {
mac_destroy_cred_label(execlabelstorage);
return (error);
}
imgp->execlabel = execlabelstorage;
return (0);
}
void
mac_execve_exit(struct image_params *imgp)
{
if (imgp->execlabel != NULL)
mac_destroy_cred_label(imgp->execlabel);
}
void
mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp,
struct label *interpvnodelabel, struct image_params *imgp)
{
ASSERT_VOP_LOCKED(vp, "mac_execve_transition");
if (!mac_enforce_process && !mac_enforce_fs)
return;
MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label,
interpvnodelabel, imgp, imgp->execlabel);
}
int
mac_execve_will_transition(struct ucred *old, struct vnode *vp,
struct label *interpvnodelabel, struct image_params *imgp)
{
int result;
ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition");
if (!mac_enforce_process && !mac_enforce_fs)
return (0);
result = 0;
MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label,
interpvnodelabel, imgp, imgp->execlabel);
return (result);
}
int
mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, acc_mode);
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);
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);
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);
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);
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);
MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type);
return (error);
}
int
mac_check_vnode_exec(struct ucred *cred, struct vnode *vp,
struct image_params *imgp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec");
if (!mac_enforce_process && !mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label, imgp,
imgp->execlabel);
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);
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);
MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label,
attrnamespace, name, uio);
return (error);
}
int
mac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
struct vnode *vp, struct componentname *cnp)
{
int error;
ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link");
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp,
&vp->v_label, cnp);
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);
MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp);
return (error);
}
int
mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap");
if (!mac_enforce_fs || !mac_enforce_vm)
return (0);
MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot);
return (error);
}
void
mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot)
{
int result = *prot;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade");
if (!mac_enforce_fs || !mac_enforce_vm)
return;
MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label,
&result);
*prot = result;
}
int
mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect");
if (!mac_enforce_fs || !mac_enforce_vm)
return (0);
MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot);
return (error);
}
int
mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode);
return (error);
}
int
mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
&vp->v_label);
return (error);
}
int
mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
&vp->v_label);
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);
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);
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");
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);
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);
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);
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);
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);
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);
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);
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);
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);
MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime,
mtime);
return (error);
}
int
mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
&vp->v_label);
return (error);
}
int
mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write");
if (!mac_enforce_fs)
return (0);
MAC_CHECK(check_vnode_write, active_cred, file_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 */
mac_cred_mmapped_drop_perms_recurse(td, cred,
&td->td_proc->p_vmspace->vm_map);
/* 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;
int result;
vm_prot_t revokeperms;
vm_object_t object;
vm_ooffset_t offset;
struct vnode *vp;
if (!mac_mmap_revocation)
return;
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 = vme->max_protection;
mac_check_vnode_mmap_downgrade(cred, vp, &result);
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 %ld: revoking %s perms from %#lx:%ld "
"(max %s/cur %s)\n", (long)td->td_proc->p_pid,
prot2str(revokeperms), (u_long)vme->start,
(long)(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);
}
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))
if_printf(ifnet, "not initialized\n");
MAC_CHECK(check_ifnet_transmit, ifnet, &ifnet->if_label, mbuf,
&mbuf->m_pkthdr.label);
return (error);
}
int
mac_check_kenv_dump(struct ucred *cred)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_kenv_dump, cred);
return (error);
}
int
mac_check_kenv_get(struct ucred *cred, char *name)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_kenv_get, cred, name);
return (error);
}
int
mac_check_kenv_set(struct ucred *cred, char *name, char *value)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_kenv_set, cred, name, value);
return (error);
}
int
mac_check_kenv_unset(struct ucred *cred, char *name)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_kenv_unset, cred, name);
return (error);
}
int
mac_check_kld_load(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_kld_load");
if (!mac_enforce_kld)
return (0);
MAC_CHECK(check_kld_load, cred, vp, &vp->v_label);
return (error);
}
int
mac_check_kld_stat(struct ucred *cred)
{
int error;
if (!mac_enforce_kld)
return (0);
MAC_CHECK(check_kld_stat, cred);
return (error);
}
int
mac_check_kld_unload(struct ucred *cred)
{
int error;
if (!mac_enforce_kld)
return (0);
MAC_CHECK(check_kld_unload, cred);
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;
PIPE_LOCK_ASSERT(pipe, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data);
return (error);
}
int
mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe)
{
int error;
PIPE_LOCK_ASSERT(pipe, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label);
return (error);
}
int
mac_check_pipe_read(struct ucred *cred, struct pipe *pipe)
{
int error;
PIPE_LOCK_ASSERT(pipe, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label);
return (error);
}
static int
mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
struct label *newlabel)
{
int error;
PIPE_LOCK_ASSERT(pipe, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel);
return (error);
}
int
mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe)
{
int error;
PIPE_LOCK_ASSERT(pipe, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label);
return (error);
}
int
mac_check_pipe_write(struct ucred *cred, struct pipe *pipe)
{
int error;
PIPE_LOCK_ASSERT(pipe, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label);
return (error);
}
int
mac_check_proc_debug(struct ucred *cred, struct proc *proc)
{
int error;
PROC_LOCK_ASSERT(proc, MA_OWNED);
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;
PROC_LOCK_ASSERT(proc, MA_OWNED);
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;
PROC_LOCK_ASSERT(proc, MA_OWNED);
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_deliver(struct socket *socket, struct mbuf *mbuf)
{
int error;
if (!mac_enforce_socket)
return (0);
MAC_CHECK(check_socket_deliver, socket, &socket->so_label, mbuf,
&mbuf->m_pkthdr.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_check_system_acct(struct ucred *cred, struct vnode *vp)
{
int error;
if (vp != NULL) {
ASSERT_VOP_LOCKED(vp, "mac_check_system_acct");
}
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_acct, cred, vp,
vp != NULL ? &vp->v_label : NULL);
return (error);
}
int
mac_check_system_nfsd(struct ucred *cred)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_nfsd, cred);
return (error);
}
int
mac_check_system_reboot(struct ucred *cred, int howto)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_reboot, cred, howto);
return (error);
}
int
mac_check_system_settime(struct ucred *cred)
{
int error;
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_settime, cred);
return (error);
}
int
mac_check_system_swapon(struct ucred *cred, struct vnode *vp)
{
int error;
ASSERT_VOP_LOCKED(vp, "mac_check_system_swapon");
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_swapon, cred, vp, &vp->v_label);
return (error);
}
int
mac_check_system_sysctl(struct ucred *cred, int *name, u_int namelen,
void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen)
{
int error;
/*
* XXXMAC: We're very much like to assert the SYSCTL_LOCK here,
* but since it's not exported from kern_sysctl.c, we can't.
*/
if (!mac_enforce_system)
return (0);
MAC_CHECK(check_system_sysctl, cred, name, namelen, old, oldlenp,
inkernel, new, newlen);
return (error);
}
int
mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
struct ifnet *ifnet)
{
char *elements, *buffer;
struct mac mac;
int error;
error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac));
if (error)
return (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_ifnet_label(&ifnet->if_label, elements,
buffer, mac.m_buflen, M_WAITOK);
if (error == 0)
error = copyout(buffer, mac.m_string, strlen(buffer)+1);
free(buffer, M_MACTEMP);
free(elements, M_MACTEMP);
return (error);
}
int
mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
struct ifnet *ifnet)
{
struct label intlabel;
struct mac mac;
char *buffer;
int error;
error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac));
if (error)
return (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);
}
mac_init_ifnet_label(&intlabel);
error = mac_internalize_ifnet_label(&intlabel, buffer);
free(buffer, M_MACTEMP);
if (error) {
mac_destroy_ifnet_label(&intlabel);
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) {
mac_destroy_ifnet_label(&intlabel);
return (error);
}
MAC_CHECK(check_ifnet_relabel, cred, ifnet, &ifnet->if_label,
&intlabel);
if (error) {
mac_destroy_ifnet_label(&intlabel);
return (error);
}
MAC_PERFORM(relabel_ifnet, cred, ifnet, &ifnet->if_label, &intlabel);
mac_destroy_ifnet_label(&intlabel);
return (0);
}
void
mac_create_devfs_device(dev_t dev, struct devfs_dirent *de)
{
MAC_PERFORM(create_devfs_device, dev, de, &de->de_label);
}
void
mac_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd,
struct devfs_dirent *de)
{
MAC_PERFORM(create_devfs_symlink, cred, dd, &dd->de_label, de,
&de->de_label);
}
void
mac_create_devfs_directory(char *dirname, int dirnamelen,
struct devfs_dirent *de)
{
MAC_PERFORM(create_devfs_directory, dirname, dirnamelen, de,
&de->de_label);
}
int
mac_setsockopt_label_set(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);
}
mac_init_socket_label(&intlabel, M_WAITOK);
error = mac_internalize_socket_label(&intlabel, buffer);
free(buffer, M_MACTEMP);
if (error) {
mac_destroy_socket_label(&intlabel);
return (error);
}
mac_check_socket_relabel(cred, so, &intlabel);
if (error) {
mac_destroy_socket_label(&intlabel);
return (error);
}
mac_relabel_socket(cred, so, &intlabel);
mac_destroy_socket_label(&intlabel);
return (0);
}
int
mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label)
{
int error;
PIPE_LOCK_ASSERT(pipe, MA_OWNED);
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 *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, M_WAITOK);
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_get(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, M_WAITOK);
if (error == 0)
error = copyout(buffer, mac->m_string, strlen(buffer)+1);
free(buffer, M_MACTEMP);
free(elements, M_MACTEMP);
return (error);
}
/*
* 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;
int error;
ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
return (EOPNOTSUPP);
error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel);
if (error)
return (error);
mac_relabel_vnode(ap->a_cred, vp, intlabel);
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_type != VNON)
printf("vn_setlabel: null v_mount with non-VNON\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);
}
int
__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap)
{
char *elements, *buffer;
struct mac mac;
struct proc *tproc;
struct ucred *tcred;
int error;
error = copyin(SCARG(uap, mac_p), &mac, sizeof(mac));
if (error)
return (error);
error = mac_check_structmac_consistent(&mac);
if (error)
return (error);
tproc = pfind(uap->pid);
if (tproc == NULL)
return (ESRCH);
tcred = NULL; /* Satisfy gcc. */
error = p_cansee(td, tproc);
if (error == 0)
tcred = crhold(tproc->p_ucred);
PROC_UNLOCK(tproc);
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);
crfree(tcred);
return (error);
}
buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
error = mac_externalize_cred_label(&tcred->cr_label, elements,
buffer, mac.m_buflen, M_WAITOK);
if (error == 0)
error = copyout(buffer, mac.m_string, strlen(buffer)+1);
free(buffer, M_MACTEMP);
free(elements, M_MACTEMP);
crfree(tcred);
return (error);
}
/*
* MPSAFE
*/
int
__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
{
char *elements, *buffer;
struct mac mac;
int error;
error = copyin(uap->mac_p, &mac, sizeof(mac));
if (error)
return (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_cred_label(&td->td_ucred->cr_label,
elements, buffer, mac.m_buflen, M_WAITOK);
if (error == 0)
error = copyout(buffer, mac.m_string, strlen(buffer)+1);
free(buffer, M_MACTEMP);
free(elements, M_MACTEMP);
return (error);
}
/*
* MPSAFE
*/
int
__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
{
struct ucred *newcred, *oldcred;
struct label intlabel;
struct proc *p;
struct mac mac;
char *buffer;
int error;
error = copyin(uap->mac_p, &mac, sizeof(mac));
if (error)
return (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);
}
mac_init_cred_label(&intlabel);
error = mac_internalize_cred_label(&intlabel, buffer);
free(buffer, M_MACTEMP);
if (error) {
mac_destroy_cred_label(&intlabel);
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);
crfree(newcred);
goto out;
}
setsugid(p);
crcopy(newcred, oldcred);
mac_relabel_cred(newcred, &intlabel);
p->p_ucred = newcred;
/*
* Grab additional reference for use while revoking mmaps, prior
* to releasing the proc lock and sharing the cred.
*/
crhold(newcred);
PROC_UNLOCK(p);
if (mac_enforce_vm) {
mtx_lock(&Giant);
mac_cred_mmapped_drop_perms(td, newcred);
mtx_unlock(&Giant);
}
crfree(newcred); /* Free revocation reference. */
crfree(oldcred);
out:
mac_destroy_cred_label(&intlabel);
return (error);
}
/*
* MPSAFE
*/
int
__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
{
char *elements, *buffer;
struct label intlabel;
struct file *fp;
struct mac mac;
struct vnode *vp;
struct pipe *pipe;
short label_type;
int error;
error = copyin(uap->mac_p, &mac, sizeof(mac));
if (error)
return (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);
mtx_lock(&Giant); /* VFS */
error = fget(td, SCARG(uap, fd), &fp);
if (error)
goto out;
label_type = fp->f_type;
switch (fp->f_type) {
case DTYPE_FIFO:
case DTYPE_VNODE:
vp = (struct vnode *)fp->f_data;
mac_init_vnode_label(&intlabel);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
mac_copy_vnode_label(&vp->v_label, &intlabel);
VOP_UNLOCK(vp, 0, td);
break;
case DTYPE_PIPE:
pipe = (struct pipe *)fp->f_data;
mac_init_pipe_label(&intlabel);
PIPE_LOCK(pipe);
mac_copy_pipe_label(pipe->pipe_label, &intlabel);
PIPE_UNLOCK(pipe);
break;
default:
error = EINVAL;
fdrop(fp, td);
goto out;
}
fdrop(fp, td);
switch (label_type) {
case DTYPE_FIFO:
case DTYPE_VNODE:
if (error == 0)
error = mac_externalize_vnode_label(&intlabel,
elements, buffer, mac.m_buflen, M_WAITOK);
mac_destroy_vnode_label(&intlabel);
break;
case DTYPE_PIPE:
error = mac_externalize_pipe_label(&intlabel, elements,
buffer, mac.m_buflen, M_WAITOK);
mac_destroy_pipe_label(&intlabel);
break;
default:
panic("__mac_get_fd: corrupted label_type");
}
if (error == 0)
error = copyout(buffer, mac.m_string, strlen(buffer)+1);
out:
mtx_unlock(&Giant); /* VFS */
free(buffer, M_MACTEMP);
free(elements, M_MACTEMP);
return (error);
}
/*
* MPSAFE
*/
int
__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
{
char *elements, *buffer;
struct nameidata nd;
struct label intlabel;
struct mac mac;
int error;
error = copyin(uap->mac_p, &mac, sizeof(mac));
if (error)
return (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);
mtx_lock(&Giant); /* VFS */
NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p,
td);
error = namei(&nd);
if (error)
goto out;
mac_init_vnode_label(&intlabel);
mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel);
error = mac_externalize_vnode_label(&intlabel, elements, buffer,
mac.m_buflen, M_WAITOK);
NDFREE(&nd, 0);
mac_destroy_vnode_label(&intlabel);
if (error == 0)
error = copyout(buffer, mac.m_string, strlen(buffer)+1);
out:
mtx_unlock(&Giant); /* VFS */
free(buffer, M_MACTEMP);
free(elements, M_MACTEMP);
return (error);
}
/*
* MPSAFE
*/
int
__mac_get_link(struct thread *td, struct __mac_get_link_args *uap)
{
char *elements, *buffer;
struct nameidata nd;
struct label intlabel;
struct mac mac;
int error;
error = copyin(uap->mac_p, &mac, sizeof(mac));
if (error)
return (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);
mtx_lock(&Giant); /* VFS */
NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p,
td);
error = namei(&nd);
if (error)
goto out;
mac_init_vnode_label(&intlabel);
mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel);
error = mac_externalize_vnode_label(&intlabel, elements, buffer,
mac.m_buflen, M_WAITOK);
NDFREE(&nd, 0);
mac_destroy_vnode_label(&intlabel);
if (error == 0)
error = copyout(buffer, mac.m_string, strlen(buffer)+1);
out:
mtx_unlock(&Giant); /* VFS */
free(buffer, M_MACTEMP);
free(elements, M_MACTEMP);
return (error);
}
/*
* MPSAFE
*/
int
__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
{
struct label intlabel;
struct pipe *pipe;
struct file *fp;
struct mount *mp;
struct vnode *vp;
struct mac mac;
char *buffer;
int error;
error = copyin(uap->mac_p, &mac, sizeof(mac));
if (error)
return (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);
}
mtx_lock(&Giant); /* VFS */
error = fget(td, SCARG(uap, fd), &fp);
if (error)
goto out;
switch (fp->f_type) {
case DTYPE_FIFO:
case DTYPE_VNODE:
mac_init_vnode_label(&intlabel);
error = mac_internalize_vnode_label(&intlabel, buffer);
if (error) {
mac_destroy_vnode_label(&intlabel);
break;
}
vp = (struct vnode *)fp->f_data;
error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
if (error != 0) {
mac_destroy_vnode_label(&intlabel);
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_vnode_label(&intlabel);
break;
case DTYPE_PIPE:
mac_init_pipe_label(&intlabel);
error = mac_internalize_pipe_label(&intlabel, buffer);
if (error == 0) {
pipe = (struct pipe *)fp->f_data;
PIPE_LOCK(pipe);
error = mac_pipe_label_set(td->td_ucred, pipe,
&intlabel);
PIPE_UNLOCK(pipe);
}
mac_destroy_pipe_label(&intlabel);
break;
default:
error = EINVAL;
}
fdrop(fp, td);
out:
mtx_unlock(&Giant); /* VFS */
free(buffer, M_MACTEMP);
return (error);
}
/*
* MPSAFE
*/
int
__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
{
struct label intlabel;
struct nameidata nd;
struct mount *mp;
struct mac mac;
char *buffer;
int error;
error = copyin(uap->mac_p, &mac, sizeof(mac));
if (error)
return (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);
}
mac_init_vnode_label(&intlabel);
error = mac_internalize_vnode_label(&intlabel, buffer);
free(buffer, M_MACTEMP);
if (error) {
mac_destroy_vnode_label(&intlabel);
return (error);
}
mtx_lock(&Giant); /* VFS */
NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p,
td);
error = namei(&nd);
if (error == 0) {
error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
if (error == 0)
error = vn_setlabel(nd.ni_vp, &intlabel,
td->td_ucred);
vn_finished_write(mp);
}
NDFREE(&nd, 0);
mtx_unlock(&Giant); /* VFS */
mac_destroy_vnode_label(&intlabel);
return (error);
}
/*
* MPSAFE
*/
int
__mac_set_link(struct thread *td, struct __mac_set_link_args *uap)
{
struct label intlabel;
struct nameidata nd;
struct mount *mp;
struct mac mac;
char *buffer;
int error;
error = copyin(uap->mac_p, &mac, sizeof(mac));
if (error)
return (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);
}
mac_init_vnode_label(&intlabel);
error = mac_internalize_vnode_label(&intlabel, buffer);
free(buffer, M_MACTEMP);
if (error) {
mac_destroy_vnode_label(&intlabel);
return (error);
}
mtx_lock(&Giant); /* VFS */
NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p,
td);
error = namei(&nd);
if (error == 0) {
error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
if (error == 0)
error = vn_setlabel(nd.ni_vp, &intlabel,
td->td_ucred);
vn_finished_write(mp);
}
NDFREE(&nd, 0);
mtx_unlock(&Giant); /* VFS */
mac_destroy_vnode_label(&intlabel);
return (error);
}
/*
* MPSAFE
*/
int
mac_syscall(struct thread *td, struct mac_syscall_args *uap)
{
struct mac_policy_conf *mpc;
char target[MAC_MAX_POLICY_NAME];
int error;
error = copyinstr(SCARG(uap, policy), target, sizeof(target), NULL);
if (error)
return (error);
error = ENOSYS;
MAC_POLICY_LIST_BUSY();
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {
if (strcmp(mpc->mpc_name, target) == 0 &&
mpc->mpc_ops->mpo_syscall != NULL) {
error = mpc->mpc_ops->mpo_syscall(td,
SCARG(uap, call), SCARG(uap, arg));
goto out;
}
}
out:
MAC_POLICY_LIST_UNBUSY();
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_pid(struct thread *td, struct __mac_get_pid_args *uap)
{
return (ENOSYS);
}
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_get_link(struct thread *td, struct __mac_get_link_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);
}
int
__mac_set_link(struct thread *td, struct __mac_set_link_args *uap)
{
return (ENOSYS);
}
int
mac_syscall(struct thread *td, struct mac_syscall_args *uap)
{
return (ENOSYS);
}
#endif
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