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freebsd-dev/sys/security/mac_mls/mac_mls.c
Robert Watson 177142e458 Pass active_cred and file_cred into the MAC framework explicitly 
for mac_check_vnode_{poll,read,stat,write}().  Pass in fp->f_cred
when calling these checks with a struct file available.  Otherwise,
pass NOCRED.  All currently MAC policies use active_cred, but
could now offer the cached credential semantic used for the base
system security model.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs
2002-08-19 19:04:53 +00:00

2254 lines
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/*-
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
* Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson 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.
* MLS fixed label mandatory confidentiality policy.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/acl.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/mac.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/sysent.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/pipe.h>
#include <sys/sysctl.h>
#include <fs/devfs/devfs.h>
#include <net/bpfdesc.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/ip_var.h>
#include <vm/vm.h>
#include <sys/mac_policy.h>
#include <security/mac_mls/mac_mls.h>
SYSCTL_DECL(_security_mac);
SYSCTL_NODE(_security_mac, OID_AUTO, mls, CTLFLAG_RW, 0,
"TrustedBSD mac_mls policy controls");
static int mac_mls_enabled = 0;
SYSCTL_INT(_security_mac_mls, OID_AUTO, enabled, CTLFLAG_RW,
&mac_mls_enabled, 0, "Enforce MAC/MLS policy");
static int destroyed_not_inited;
SYSCTL_INT(_security_mac_mls, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
&destroyed_not_inited, 0, "Count of labels destroyed but not inited");
static int mac_mls_revocation_enabled = 0;
SYSCTL_INT(_security_mac_mls, OID_AUTO, revocation_enabled, CTLFLAG_RW,
&mac_mls_revocation_enabled, 0, "Revoke access to objects on relabel");
TUNABLE_INT("security.mac.mls.revocation_enabled",
&mac_mls_revocation_enabled);
static int mac_mls_slot;
#define SLOT(l) ((struct mac_mls *)LABEL_TO_SLOT((l), mac_mls_slot).l_ptr)
MALLOC_DEFINE(M_MACMLS, "mls label", "MAC/MLS labels");
static int mac_mls_check_vnode_open(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, mode_t acc_mode);
static struct mac_mls *
mls_alloc(int how)
{
struct mac_mls *mac_mls;
mac_mls = malloc(sizeof(struct mac_mls), M_MACMLS, M_ZERO | how);
return (mac_mls);
}
static void
mls_free(struct mac_mls *mac_mls)
{
if (mac_mls != NULL)
free(mac_mls, M_MACMLS);
else
atomic_add_int(&destroyed_not_inited, 1);
}
static int
mac_mls_dominate_element(struct mac_mls_element *a,
struct mac_mls_element *b)
{
switch(a->mme_type) {
case MAC_MLS_TYPE_EQUAL:
case MAC_MLS_TYPE_HIGH:
return (1);
case MAC_MLS_TYPE_LOW:
switch (b->mme_type) {
case MAC_MLS_TYPE_LEVEL:
case MAC_MLS_TYPE_HIGH:
return (0);
case MAC_MLS_TYPE_EQUAL:
case MAC_MLS_TYPE_LOW:
return (1);
default:
panic("mac_mls_dominate_element: b->mme_type invalid");
}
case MAC_MLS_TYPE_LEVEL:
switch (b->mme_type) {
case MAC_MLS_TYPE_EQUAL:
case MAC_MLS_TYPE_LOW:
return (1);
case MAC_MLS_TYPE_HIGH:
return (0);
case MAC_MLS_TYPE_LEVEL:
return (a->mme_level >= b->mme_level);
default:
panic("mac_mls_dominate_element: b->mme_type invalid");
}
default:
panic("mac_mls_dominate_element: a->mme_type invalid");
}
return (0);
}
static int
mac_mls_range_in_range(struct mac_mls *rangea, struct mac_mls *rangeb)
{
return (mac_mls_dominate_element(&rangeb->mm_rangehigh,
&rangea->mm_rangehigh) &&
mac_mls_dominate_element(&rangea->mm_rangelow,
&rangeb->mm_rangelow));
}
static int
mac_mls_single_in_range(struct mac_mls *single, struct mac_mls *range)
{
KASSERT((single->mm_flag & MAC_MLS_FLAG_SINGLE) != 0,
("mac_mls_single_in_range: a not single"));
KASSERT((range->mm_flag & MAC_MLS_FLAG_RANGE) != 0,
("mac_mls_single_in_range: b not range"));
return (mac_mls_dominate_element(&range->mm_rangehigh,
&single->mm_single) &&
mac_mls_dominate_element(&single->mm_single,
&range->mm_rangelow));
return (1);
}
static int
mac_mls_dominate_single(struct mac_mls *a, struct mac_mls *b)
{
KASSERT((a->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
("mac_mls_dominate_single: a not single"));
KASSERT((b->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
("mac_mls_dominate_single: b not single"));
return (mac_mls_dominate_element(&a->mm_single, &b->mm_single));
}
static int
mac_mls_equal_element(struct mac_mls_element *a, struct mac_mls_element *b)
{
if (a->mme_type == MAC_MLS_TYPE_EQUAL ||
b->mme_type == MAC_MLS_TYPE_EQUAL)
return (1);
return (a->mme_type == b->mme_type && a->mme_level == b->mme_level);
}
static int
mac_mls_equal_range(struct mac_mls *a, struct mac_mls *b)
{
KASSERT((a->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
("mac_mls_equal_range: a not range"));
KASSERT((b->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
("mac_mls_equal_range: b not range"));
return (mac_mls_equal_element(&a->mm_rangelow, &b->mm_rangelow) &&
mac_mls_equal_element(&a->mm_rangehigh, &b->mm_rangehigh));
}
static int
mac_mls_equal_single(struct mac_mls *a, struct mac_mls *b)
{
KASSERT((a->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
("mac_mls_equal_single: a not single"));
KASSERT((b->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
("mac_mls_equal_single: b not single"));
return (mac_mls_equal_element(&a->mm_single, &b->mm_single));
}
static int
mac_mls_valid(struct mac_mls *mac_mls)
{
if (mac_mls->mm_flags & MAC_MLS_FLAG_SINGLE) {
switch (mac_mls->mm_single.mme_type) {
case MAC_MLS_TYPE_LEVEL:
break;
case MAC_MLS_TYPE_EQUAL:
case MAC_MLS_TYPE_HIGH:
case MAC_MLS_TYPE_LOW:
if (mac_mls->mm_single.mme_level != 0)
return (EINVAL);
break;
default:
return (EINVAL);
}
} else {
if (mac_mls->mm_single.mme_type != MAC_MLS_TYPE_UNDEF)
return (EINVAL);
}
if (mac_mls->mm_flags & MAC_MLS_FLAG_RANGE) {
switch (mac_mls->mm_rangelow.mme_type) {
case MAC_MLS_TYPE_LEVEL:
break;
case MAC_MLS_TYPE_EQUAL:
case MAC_MLS_TYPE_HIGH:
case MAC_MLS_TYPE_LOW:
if (mac_mls->mm_rangelow.mme_level != 0)
return (EINVAL);
break;
default:
return (EINVAL);
}
switch (mac_mls->mm_rangehigh.mme_type) {
case MAC_MLS_TYPE_LEVEL:
break;
case MAC_MLS_TYPE_EQUAL:
case MAC_MLS_TYPE_HIGH:
case MAC_MLS_TYPE_LOW:
if (mac_mls->mm_rangehigh.mme_level != 0)
return (EINVAL);
break;
default:
return (EINVAL);
}
if (!mac_mls_dominate_element(&mac_mls->mm_rangehigh,
&mac_mls->mm_rangelow))
return (EINVAL);
} else {
if (mac_mls->mm_rangelow.mme_type != MAC_MLS_TYPE_UNDEF ||
mac_mls->mm_rangehigh.mme_type != MAC_MLS_TYPE_UNDEF)
return (EINVAL);
}
return (0);
}
static void
mac_mls_set_range(struct mac_mls *mac_mls, u_short typelow,
u_short levellow, u_short typehigh, u_short levelhigh)
{
mac_mls->mm_rangelow.mme_type = typelow;
mac_mls->mm_rangelow.mme_level = levellow;
mac_mls->mm_rangehigh.mme_type = typehigh;
mac_mls->mm_rangehigh.mme_level = levelhigh;
mac_mls->mm_flags |= MAC_MLS_FLAG_RANGE;
}
static void
mac_mls_set_single(struct mac_mls *mac_mls, u_short type, u_short level)
{
mac_mls->mm_single.mme_type = type;
mac_mls->mm_single.mme_level = level;
mac_mls->mm_flags |= MAC_MLS_FLAG_SINGLE;
}
static void
mac_mls_copy_range(struct mac_mls *labelfrom, struct mac_mls *labelto)
{
KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
("mac_mls_copy_range: labelfrom not range"));
labelto->mm_rangelow = labelfrom->mm_rangelow;
labelto->mm_rangehigh = labelfrom->mm_rangehigh;
labelto->mm_flags |= MAC_MLS_FLAG_RANGE;
}
static void
mac_mls_copy_single(struct mac_mls *labelfrom, struct mac_mls *labelto)
{
KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
("mac_mls_copy_single: labelfrom not single"));
labelto->mm_single = labelfrom->mm_single;
labelto->mm_flags |= MAC_MLS_FLAG_SINGLE;
}
static void
mac_mls_copy_single_to_range(struct mac_mls *labelfrom,
struct mac_mls *labelto)
{
KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
("mac_mls_copy_single_to_range: labelfrom not single"));
labelto->mm_rangelow = labelfrom->mm_single;
labelto->mm_rangehigh = labelfrom->mm_single;
labelto->mm_flags |= MAC_MLS_FLAG_RANGE;
}
/*
* Policy module operations.
*/
static void
mac_mls_destroy(struct mac_policy_conf *conf)
{
}
static void
mac_mls_init(struct mac_policy_conf *conf)
{
}
/*
* Label operations.
*/
static void
mac_mls_init_bpfdesc(struct bpf_d *bpf_d, struct label *label)
{
SLOT(label) = mls_alloc(M_WAITOK);
}
static void
mac_mls_init_cred(struct ucred *ucred, struct label *label)
{
SLOT(label) = mls_alloc(M_WAITOK);
}
static void
mac_mls_init_devfsdirent(struct devfs_dirent *devfs_dirent,
struct label *label)
{
SLOT(label) = mls_alloc(M_WAITOK);
}
static void
mac_mls_init_ifnet(struct ifnet *ifnet, struct label *label)
{
SLOT(label) = mls_alloc(M_WAITOK);
}
static void
mac_mls_init_ipq(struct ipq *ipq, struct label *label)
{
SLOT(label) = mls_alloc(M_WAITOK);
}
static int
mac_mls_init_mbuf(struct mbuf *mbuf, int how, struct label *label)
{
SLOT(label) = mls_alloc(how);
if (SLOT(label) == NULL)
return (ENOMEM);
return (0);
}
static void
mac_mls_init_mount(struct mount *mount, struct label *mntlabel,
struct label *fslabel)
{
SLOT(mntlabel) = mls_alloc(M_WAITOK);
SLOT(fslabel) = mls_alloc(M_WAITOK);
}
static void
mac_mls_init_socket(struct socket *socket, struct label *label,
struct label *peerlabel)
{
SLOT(label) = mls_alloc(M_WAITOK);
SLOT(peerlabel) = mls_alloc(M_WAITOK);
}
static void
mac_mls_init_pipe(struct pipe *pipe, struct label *label)
{
SLOT(label) = mls_alloc(M_WAITOK);
}
static void
mac_mls_init_temp(struct label *label)
{
SLOT(label) = mls_alloc(M_WAITOK);
}
static void
mac_mls_init_vnode(struct vnode *vp, struct label *label)
{
SLOT(label) = mls_alloc(M_WAITOK);
}
static void
mac_mls_destroy_bpfdesc(struct bpf_d *bpf_d, struct label *label)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_mls_destroy_cred(struct ucred *ucred, struct label *label)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_mls_destroy_devfsdirent(struct devfs_dirent *devfs_dirent,
struct label *label)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_mls_destroy_ifnet(struct ifnet *ifnet, struct label *label)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_mls_destroy_ipq(struct ipq *ipq, struct label *label)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_mls_destroy_mbuf(struct mbuf *mbuf, struct label *label)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_mls_destroy_mount(struct mount *mount, struct label *mntlabel,
struct label *fslabel)
{
mls_free(SLOT(mntlabel));
SLOT(mntlabel) = NULL;
mls_free(SLOT(fslabel));
SLOT(fslabel) = NULL;
}
static void
mac_mls_destroy_socket(struct socket *socket, struct label *label,
struct label *peerlabel)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
mls_free(SLOT(peerlabel));
SLOT(peerlabel) = NULL;
}
static void
mac_mls_destroy_pipe(struct pipe *pipe, struct label *label)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_mls_destroy_temp(struct label *label)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_mls_destroy_vnode(struct vnode *vp, struct label *label)
{
mls_free(SLOT(label));
SLOT(label) = NULL;
}
static int
mac_mls_externalize(struct label *label, struct mac *extmac)
{
struct mac_mls *mac_mls;
mac_mls = SLOT(label);
if (mac_mls == NULL) {
printf("mac_mls_externalize: NULL pointer\n");
return (0);
}
extmac->m_mls = *mac_mls;
return (0);
}
static int
mac_mls_internalize(struct label *label, struct mac *extmac)
{
struct mac_mls *mac_mls;
int error;
mac_mls = SLOT(label);
error = mac_mls_valid(mac_mls);
if (error)
return (error);
*mac_mls = extmac->m_mls;
return (0);
}
/*
* Labeling event operations: file system objects, and things that look
* a lot like file system objects.
*/
static void
mac_mls_create_devfs_device(dev_t dev, struct devfs_dirent *devfs_dirent,
struct label *label)
{
struct mac_mls *mac_mls;
int mls_type;
mac_mls = SLOT(label);
if (strcmp(dev->si_name, "null") == 0 ||
strcmp(dev->si_name, "zero") == 0 ||
strcmp(dev->si_name, "random") == 0 ||
strncmp(dev->si_name, "fd/", strlen("fd/")) == 0)
mls_type = MAC_MLS_TYPE_EQUAL;
else if (strcmp(dev->si_name, "kmem") == 0 ||
strcmp(dev->si_name, "mem") == 0)
mls_type = MAC_MLS_TYPE_HIGH;
else
mls_type = MAC_MLS_TYPE_LOW;
mac_mls_set_single(mac_mls, mls_type, 0);
}
static void
mac_mls_create_devfs_directory(char *dirname, int dirnamelen,
struct devfs_dirent *devfs_dirent, struct label *label)
{
struct mac_mls *mac_mls;
mac_mls = SLOT(label);
mac_mls_set_single(mac_mls, MAC_MLS_TYPE_LOW, 0);
}
static void
mac_mls_create_devfs_vnode(struct devfs_dirent *devfs_dirent,
struct label *direntlabel, struct vnode *vp, struct label *vnodelabel)
{
struct mac_mls *source, *dest;
source = SLOT(direntlabel);
dest = SLOT(vnodelabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_vnode(struct ucred *cred, struct vnode *parent,
struct label *parentlabel, struct vnode *child, struct label *childlabel)
{
struct mac_mls *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(childlabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_mount(struct ucred *cred, struct mount *mp,
struct label *mntlabel, struct label *fslabel)
{
struct mac_mls *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(mntlabel);
mac_mls_copy_single(source, dest);
dest = SLOT(fslabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_root_mount(struct ucred *cred, struct mount *mp,
struct label *mntlabel, struct label *fslabel)
{
struct mac_mls *mac_mls;
/* Always mount root as high integrity. */
mac_mls = SLOT(fslabel);
mac_mls_set_single(mac_mls, MAC_MLS_TYPE_LOW, 0);
mac_mls = SLOT(mntlabel);
mac_mls_set_single(mac_mls, MAC_MLS_TYPE_LOW, 0);
}
static void
mac_mls_relabel_vnode(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, struct label *label)
{
struct mac_mls *source, *dest;
source = SLOT(label);
dest = SLOT(vnodelabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_update_devfsdirent(struct devfs_dirent *devfs_dirent,
struct label *direntlabel, struct vnode *vp, struct label *vnodelabel)
{
struct mac_mls *source, *dest;
source = SLOT(vnodelabel);
dest = SLOT(direntlabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_update_procfsvnode(struct vnode *vp, struct label *vnodelabel,
struct ucred *cred)
{
struct mac_mls *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(vnodelabel);
/*
* Only copy the single, not the range, since vnodes only have
* a single.
*/
mac_mls_copy_single(source, dest);
}
static int
mac_mls_update_vnode_from_externalized(struct vnode *vp,
struct label *vnodelabel, struct mac *extmac)
{
struct mac_mls *source, *dest;
int error;
source = &extmac->m_mls;
dest = SLOT(vnodelabel);
error = mac_mls_valid(source);
if (error)
return (error);
if ((source->mm_flags & MAC_MLS_FLAGS_BOTH) != MAC_MLS_FLAG_SINGLE)
return (EINVAL);
mac_mls_copy_single(source, dest);
return (0);
}
static void
mac_mls_update_vnode_from_mount(struct vnode *vp, struct label *vnodelabel,
struct mount *mp, struct label *fslabel)
{
struct mac_mls *source, *dest;
source = SLOT(fslabel);
dest = SLOT(vnodelabel);
mac_mls_copy_single(source, dest);
}
/*
* Labeling event operations: IPC object.
*/
static void
mac_mls_create_mbuf_from_socket(struct socket *so, struct label *socketlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_mls *source, *dest;
source = SLOT(socketlabel);
dest = SLOT(mbuflabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_socket(struct ucred *cred, struct socket *socket,
struct label *socketlabel)
{
struct mac_mls *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(socketlabel);
mac_mls_copy_single(source, dest);
mac_mls_copy_single_to_range(source, dest);
}
static void
mac_mls_create_pipe(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_mls *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(pipelabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_socket_from_socket(struct socket *oldsocket,
struct label *oldsocketlabel, struct socket *newsocket,
struct label *newsocketlabel)
{
struct mac_mls *source, *dest;
source = SLOT(oldsocketlabel);
dest = SLOT(newsocketlabel);
mac_mls_copy_single(source, dest);
mac_mls_copy_range(source, dest);
}
static void
mac_mls_relabel_socket(struct ucred *cred, struct socket *socket,
struct label *socketlabel, struct label *newlabel)
{
struct mac_mls *source, *dest;
source = SLOT(newlabel);
dest = SLOT(socketlabel);
mac_mls_copy_single(source, dest);
mac_mls_copy_range(source, dest);
}
static void
mac_mls_relabel_pipe(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, struct label *newlabel)
{
struct mac_mls *source, *dest;
source = SLOT(newlabel);
dest = SLOT(pipelabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel,
struct socket *socket, struct label *socketpeerlabel)
{
struct mac_mls *source, *dest;
source = SLOT(mbuflabel);
dest = SLOT(socketpeerlabel);
mac_mls_copy_single(source, dest);
}
/*
* Labeling event operations: network objects.
*/
static void
mac_mls_set_socket_peer_from_socket(struct socket *oldsocket,
struct label *oldsocketlabel, struct socket *newsocket,
struct label *newsocketpeerlabel)
{
struct mac_mls *source, *dest;
source = SLOT(oldsocketlabel);
dest = SLOT(newsocketpeerlabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d,
struct label *bpflabel)
{
struct mac_mls *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(bpflabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel)
{
struct mac_mls *dest;
int level;
dest = SLOT(ifnetlabel);
if (ifnet->if_type == IFT_LOOP)
level = MAC_MLS_TYPE_EQUAL;
else
level = MAC_MLS_TYPE_LOW;
mac_mls_set_single(dest, level, 0);
mac_mls_set_range(dest, level, 0, level, 0);
}
static void
mac_mls_create_ipq(struct mbuf *fragment, struct label *fragmentlabel,
struct ipq *ipq, struct label *ipqlabel)
{
struct mac_mls *source, *dest;
source = SLOT(fragmentlabel);
dest = SLOT(ipqlabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel,
struct mbuf *datagram, struct label *datagramlabel)
{
struct mac_mls *source, *dest;
source = SLOT(ipqlabel);
dest = SLOT(datagramlabel);
/* Just use the head, since we require them all to match. */
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_fragment(struct mbuf *datagram, struct label *datagramlabel,
struct mbuf *fragment, struct label *fragmentlabel)
{
struct mac_mls *source, *dest;
source = SLOT(datagramlabel);
dest = SLOT(fragmentlabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_mbuf_from_mbuf(struct mbuf *oldmbuf,
struct label *oldmbuflabel, struct mbuf *newmbuf,
struct label *newmbuflabel)
{
struct mac_mls *source, *dest;
source = SLOT(oldmbuflabel);
dest = SLOT(newmbuflabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *mbuf, struct label *mbuflabel)
{
struct mac_mls *dest;
dest = SLOT(mbuflabel);
mac_mls_set_single(dest, MAC_MLS_TYPE_EQUAL, 0);
}
static void
mac_mls_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel,
struct mbuf *mbuf, struct label *mbuflabel)
{
struct mac_mls *source, *dest;
source = SLOT(bpflabel);
dest = SLOT(mbuflabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_mls *source, *dest;
source = SLOT(ifnetlabel);
dest = SLOT(mbuflabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_mbuf_multicast_encap(struct mbuf *oldmbuf,
struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *newmbuf, struct label *newmbuflabel)
{
struct mac_mls *source, *dest;
source = SLOT(oldmbuflabel);
dest = SLOT(newmbuflabel);
mac_mls_copy_single(source, dest);
}
static void
mac_mls_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel,
struct mbuf *newmbuf, struct label *newmbuflabel)
{
struct mac_mls *source, *dest;
source = SLOT(oldmbuflabel);
dest = SLOT(newmbuflabel);
mac_mls_copy_single(source, dest);
}
static int
mac_mls_fragment_match(struct mbuf *fragment, struct label *fragmentlabel,
struct ipq *ipq, struct label *ipqlabel)
{
struct mac_mls *a, *b;
a = SLOT(ipqlabel);
b = SLOT(fragmentlabel);
return (mac_mls_equal_single(a, b));
}
static void
mac_mls_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet,
struct label *ifnetlabel, struct label *newlabel)
{
struct mac_mls *source, *dest;
source = SLOT(newlabel);
dest = SLOT(ifnetlabel);
mac_mls_copy_single(source, dest);
mac_mls_copy_range(source, dest);
}
static void
mac_mls_update_ipq(struct mbuf *fragment, struct label *fragmentlabel,
struct ipq *ipq, struct label *ipqlabel)
{
/* NOOP: we only accept matching labels, so no need to update */
}
/*
* Labeling event operations: processes.
*/
static void
mac_mls_create_cred(struct ucred *cred_parent, struct ucred *cred_child)
{
struct mac_mls *source, *dest;
source = SLOT(&cred_parent->cr_label);
dest = SLOT(&cred_child->cr_label);
mac_mls_copy_single(source, dest);
mac_mls_copy_range(source, dest);
}
static void
mac_mls_execve_transition(struct ucred *old, struct ucred *new,
struct vnode *vp, struct mac *vnodelabel)
{
struct mac_mls *source, *dest;
source = SLOT(&old->cr_label);
dest = SLOT(&new->cr_label);
mac_mls_copy_single(source, dest);
mac_mls_copy_range(source, dest);
}
static int
mac_mls_execve_will_transition(struct ucred *old, struct vnode *vp,
struct mac *vnodelabel)
{
return (0);
}
static void
mac_mls_create_proc0(struct ucred *cred)
{
struct mac_mls *dest;
dest = SLOT(&cred->cr_label);
mac_mls_set_single(dest, MAC_MLS_TYPE_EQUAL, 0);
mac_mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, MAC_MLS_TYPE_HIGH, 0);
}
static void
mac_mls_create_proc1(struct ucred *cred)
{
struct mac_mls *dest;
dest = SLOT(&cred->cr_label);
mac_mls_set_single(dest, MAC_MLS_TYPE_LOW, 0);
mac_mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, MAC_MLS_TYPE_HIGH, 0);
}
static void
mac_mls_relabel_cred(struct ucred *cred, struct label *newlabel)
{
struct mac_mls *source, *dest;
source = SLOT(newlabel);
dest = SLOT(&cred->cr_label);
mac_mls_copy_single(source, dest);
mac_mls_copy_range(source, dest);
}
/*
* Access control checks.
*/
static int
mac_mls_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel,
struct ifnet *ifnet, struct label *ifnetlabel)
{
struct mac_mls *a, *b;
if (!mac_mls_enabled)
return (0);
a = SLOT(bpflabel);
b = SLOT(ifnetlabel);
if (mac_mls_equal_single(a, b))
return (0);
return (EACCES);
}
static int
mac_mls_check_cred_relabel(struct ucred *cred, struct label *newlabel)
{
struct mac_mls *subj, *new;
subj = SLOT(&cred->cr_label);
new = SLOT(newlabel);
if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) != MAC_MLS_FLAGS_BOTH)
return (EINVAL);
/*
* XXX: Allow processes with root privilege to set labels outside
* their range, so suid things like "su" work. This WILL go away
* when we figure out the 'correct' solution...
*/
if (!suser_cred(cred, 0))
return (0);
/*
* The new single must be in the old range.
*/
if (!mac_mls_single_in_range(new, subj))
return (EPERM);
/*
* The new range must be in the old range.
*/
if (!mac_mls_range_in_range(new, subj))
return (EPERM);
/*
* XXX: Don't permit EQUAL in a label unless the subject has EQUAL.
*/
return (0);
}
static int
mac_mls_check_cred_visible(struct ucred *u1, struct ucred *u2)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&u1->cr_label);
obj = SLOT(&u2->cr_label);
/* XXX: range */
if (!mac_mls_dominate_single(subj, obj))
return (ESRCH);
return (0);
}
static int
mac_mls_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet,
struct label *ifnetlabel, struct label *newlabel)
{
struct mac_mls *subj, *new;
subj = SLOT(&cred->cr_label);
new = SLOT(newlabel);
if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) != MAC_MLS_FLAGS_BOTH)
return (EINVAL);
/* XXX: privilege model here? */
return (suser_cred(cred, 0));
}
static int
mac_mls_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_mls *p, *i;
if (!mac_mls_enabled)
return (0);
p = SLOT(mbuflabel);
i = SLOT(ifnetlabel);
return (mac_mls_single_in_range(p, i) ? 0 : EACCES);
}
static int
mac_mls_check_mount_stat(struct ucred *cred, struct mount *mp,
struct label *mntlabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(mntlabel);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data)
{
if(!mac_mls_enabled)
return (0);
/* XXX: This will be implemented soon... */
return (0);
}
static int
mac_mls_check_pipe_poll(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_pipe_read(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, struct label *newlabel)
{
struct mac_mls *subj, *obj, *new;
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
obj = SLOT(pipelabel);
if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) != MAC_MLS_FLAG_SINGLE)
return (EINVAL);
/*
* To relabel a pipe, the old pipe label must be in the subject
* range.
*/
if (!mac_mls_single_in_range(obj, subj))
return (EPERM);
/*
* To relabel a pipe, the new pipe label must be in the subject
* range.
*/
if (!mac_mls_single_in_range(new, subj))
return (EPERM);
/*
* XXX: Don't permit EQUAL in a label unless the subject has EQUAL.
*/
return (0);
}
static int
mac_mls_check_pipe_stat(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_pipe_write(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_proc_debug(struct ucred *cred, struct proc *proc)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(&proc->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_mls_dominate_single(subj, obj))
return (ESRCH);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_proc_sched(struct ucred *cred, struct proc *proc)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(&proc->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_mls_dominate_single(subj, obj))
return (ESRCH);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(&proc->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_mls_dominate_single(subj, obj))
return (ESRCH);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_socket_deliver(struct socket *so, struct label *socketlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_mls *p, *s;
if (!mac_mls_enabled)
return (0);
p = SLOT(mbuflabel);
s = SLOT(socketlabel);
return (mac_mls_equal_single(p, s) ? 0 : EACCES);
}
static int
mac_mls_check_socket_relabel(struct ucred *cred, struct socket *socket,
struct label *socketlabel, struct label *newlabel)
{
struct mac_mls *subj, *obj, *new;
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
obj = SLOT(socketlabel);
if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) != MAC_MLS_FLAG_SINGLE)
return (EINVAL);
/*
* To relabel a socket, the old socket label must be in the subject
* range.
*/
if (!mac_mls_single_in_range(obj, subj))
return (EPERM);
/*
* To relabel a socket, the new socket label must be in the subject
* range.
*/
if (!mac_mls_single_in_range(new, subj))
return (EPERM);
/*
* XXX: Don't permit EQUAL in a label unless the subject has EQUAL.
*/
return (0);
}
static int
mac_mls_check_socket_visible(struct ucred *cred, struct socket *socket,
struct label *socketlabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(socketlabel);
if (!mac_mls_dominate_single(subj, obj))
return (ENOENT);
return (0);
}
static int
mac_mls_check_vnode_access(struct ucred *cred, struct vnode *vp,
struct label *label, mode_t flags)
{
return (mac_mls_check_vnode_open(cred, vp, label, flags));
}
static int
mac_mls_check_vnode_chdir(struct ucred *cred, struct vnode *dvp,
struct label *dlabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_chroot(struct ucred *cred, struct vnode *dvp,
struct label *dlabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_create(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct componentname *cnp, struct vattr *vap)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_delete(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct vnode *vp, struct label *label,
struct componentname *cnp)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
obj = SLOT(label);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
struct label *label, acl_type_t type)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_exec(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_getacl(struct ucred *cred, struct vnode *vp,
struct label *label, acl_type_t type)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
struct label *label, int attrnamespace, const char *name, struct uio *uio)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct componentname *cnp)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_open(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, mode_t acc_mode)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
/* XXX privilege override for admin? */
if (acc_mode & (VREAD | VEXEC | VSTAT)) {
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
}
if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
}
return (0);
}
static int
mac_mls_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *label)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled || !mac_mls_revocation_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(label);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *label)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled || !mac_mls_revocation_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(label);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_readdir(struct ucred *cred, struct vnode *dvp,
struct label *dlabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_readlink(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, struct label *newlabel)
{
struct mac_mls *old, *new, *subj;
old = SLOT(vnodelabel);
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) != MAC_MLS_FLAG_SINGLE)
return (EINVAL);
/*
* To relabel a vnode, the old vnode label must be in the subject
* range.
*/
if (!mac_mls_single_in_range(old, subj))
return (EPERM);
/*
* To relabel a vnode, the new vnode label must be in the subject
* range.
*/
if (!mac_mls_single_in_range(new, subj))
return (EPERM);
/*
* XXX: Don't permit EQUAL in a label unless the subject has EQUAL.
*/
return (suser_cred(cred, 0));
}
static int
mac_mls_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct vnode *vp, struct label *label,
struct componentname *cnp)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
obj = SLOT(label);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct vnode *vp, struct label *label, int samedir,
struct componentname *cnp)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
if (vp != NULL) {
obj = SLOT(label);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
}
return (0);
}
static int
mac_mls_check_vnode_revoke(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_setacl(struct ucred *cred, struct vnode *vp,
struct label *label, acl_type_t type, struct acl *acl)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, int attrnamespace, const char *name,
struct uio *uio)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
/* XXX: protect the MAC EA in a special way? */
return (0);
}
static int
mac_mls_check_vnode_setflags(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, u_long flags)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_setmode(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, mode_t mode)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_setowner(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, uid_t uid, gid_t gid)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, struct timespec atime, struct timespec mtime)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vnodelabel)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_mls_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_mls_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *label)
{
struct mac_mls *subj, *obj;
if (!mac_mls_enabled || !mac_mls_revocation_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(label);
if (!mac_mls_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static vm_prot_t
mac_mls_check_vnode_mmap_perms(struct ucred *cred, struct vnode *vp,
struct label *label, int newmapping)
{
struct mac_mls *subj, *obj;
vm_prot_t prot = 0;
if (!mac_mls_enabled || (!mac_mls_revocation_enabled && !newmapping))
return (VM_PROT_ALL);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (mac_mls_dominate_single(subj, obj))
prot |= VM_PROT_READ | VM_PROT_EXECUTE;
if (mac_mls_dominate_single(obj, subj))
prot |= VM_PROT_WRITE;
return (prot);
}
static struct mac_policy_op_entry mac_mls_ops[] =
{
{ MAC_DESTROY,
(macop_t)mac_mls_destroy },
{ MAC_INIT,
(macop_t)mac_mls_init },
{ MAC_INIT_BPFDESC,
(macop_t)mac_mls_init_bpfdesc },
{ MAC_INIT_CRED,
(macop_t)mac_mls_init_cred },
{ MAC_INIT_DEVFSDIRENT,
(macop_t)mac_mls_init_devfsdirent },
{ MAC_INIT_IFNET,
(macop_t)mac_mls_init_ifnet },
{ MAC_INIT_IPQ,
(macop_t)mac_mls_init_ipq },
{ MAC_INIT_MBUF,
(macop_t)mac_mls_init_mbuf },
{ MAC_INIT_MOUNT,
(macop_t)mac_mls_init_mount },
{ MAC_INIT_PIPE,
(macop_t)mac_mls_init_pipe },
{ MAC_INIT_SOCKET,
(macop_t)mac_mls_init_socket },
{ MAC_INIT_TEMP,
(macop_t)mac_mls_init_temp },
{ MAC_INIT_VNODE,
(macop_t)mac_mls_init_vnode },
{ MAC_DESTROY_BPFDESC,
(macop_t)mac_mls_destroy_bpfdesc },
{ MAC_DESTROY_CRED,
(macop_t)mac_mls_destroy_cred },
{ MAC_DESTROY_DEVFSDIRENT,
(macop_t)mac_mls_destroy_devfsdirent },
{ MAC_DESTROY_IFNET,
(macop_t)mac_mls_destroy_ifnet },
{ MAC_DESTROY_IPQ,
(macop_t)mac_mls_destroy_ipq },
{ MAC_DESTROY_MBUF,
(macop_t)mac_mls_destroy_mbuf },
{ MAC_DESTROY_MOUNT,
(macop_t)mac_mls_destroy_mount },
{ MAC_DESTROY_PIPE,
(macop_t)mac_mls_destroy_pipe },
{ MAC_DESTROY_SOCKET,
(macop_t)mac_mls_destroy_socket },
{ MAC_DESTROY_TEMP,
(macop_t)mac_mls_destroy_temp },
{ MAC_DESTROY_VNODE,
(macop_t)mac_mls_destroy_vnode },
{ MAC_EXTERNALIZE,
(macop_t)mac_mls_externalize },
{ MAC_INTERNALIZE,
(macop_t)mac_mls_internalize },
{ MAC_CREATE_DEVFS_DEVICE,
(macop_t)mac_mls_create_devfs_device },
{ MAC_CREATE_DEVFS_DIRECTORY,
(macop_t)mac_mls_create_devfs_directory },
{ MAC_CREATE_DEVFS_VNODE,
(macop_t)mac_mls_create_devfs_vnode },
{ MAC_CREATE_VNODE,
(macop_t)mac_mls_create_vnode },
{ MAC_CREATE_MOUNT,
(macop_t)mac_mls_create_mount },
{ MAC_CREATE_ROOT_MOUNT,
(macop_t)mac_mls_create_root_mount },
{ MAC_RELABEL_VNODE,
(macop_t)mac_mls_relabel_vnode },
{ MAC_UPDATE_DEVFSDIRENT,
(macop_t)mac_mls_update_devfsdirent },
{ MAC_UPDATE_PROCFSVNODE,
(macop_t)mac_mls_update_procfsvnode },
{ MAC_UPDATE_VNODE_FROM_EXTERNALIZED,
(macop_t)mac_mls_update_vnode_from_externalized },
{ MAC_UPDATE_VNODE_FROM_MOUNT,
(macop_t)mac_mls_update_vnode_from_mount },
{ MAC_CREATE_MBUF_FROM_SOCKET,
(macop_t)mac_mls_create_mbuf_from_socket },
{ MAC_CREATE_PIPE,
(macop_t)mac_mls_create_pipe },
{ MAC_CREATE_SOCKET,
(macop_t)mac_mls_create_socket },
{ MAC_CREATE_SOCKET_FROM_SOCKET,
(macop_t)mac_mls_create_socket_from_socket },
{ MAC_RELABEL_PIPE,
(macop_t)mac_mls_relabel_pipe },
{ MAC_RELABEL_SOCKET,
(macop_t)mac_mls_relabel_socket },
{ MAC_SET_SOCKET_PEER_FROM_MBUF,
(macop_t)mac_mls_set_socket_peer_from_mbuf },
{ MAC_SET_SOCKET_PEER_FROM_SOCKET,
(macop_t)mac_mls_set_socket_peer_from_socket },
{ MAC_CREATE_BPFDESC,
(macop_t)mac_mls_create_bpfdesc },
{ MAC_CREATE_DATAGRAM_FROM_IPQ,
(macop_t)mac_mls_create_datagram_from_ipq },
{ MAC_CREATE_FRAGMENT,
(macop_t)mac_mls_create_fragment },
{ MAC_CREATE_IFNET,
(macop_t)mac_mls_create_ifnet },
{ MAC_CREATE_IPQ,
(macop_t)mac_mls_create_ipq },
{ MAC_CREATE_MBUF_FROM_MBUF,
(macop_t)mac_mls_create_mbuf_from_mbuf },
{ MAC_CREATE_MBUF_LINKLAYER,
(macop_t)mac_mls_create_mbuf_linklayer },
{ MAC_CREATE_MBUF_FROM_BPFDESC,
(macop_t)mac_mls_create_mbuf_from_bpfdesc },
{ MAC_CREATE_MBUF_FROM_IFNET,
(macop_t)mac_mls_create_mbuf_from_ifnet },
{ MAC_CREATE_MBUF_MULTICAST_ENCAP,
(macop_t)mac_mls_create_mbuf_multicast_encap },
{ MAC_CREATE_MBUF_NETLAYER,
(macop_t)mac_mls_create_mbuf_netlayer },
{ MAC_FRAGMENT_MATCH,
(macop_t)mac_mls_fragment_match },
{ MAC_RELABEL_IFNET,
(macop_t)mac_mls_relabel_ifnet },
{ MAC_UPDATE_IPQ,
(macop_t)mac_mls_update_ipq },
{ MAC_CREATE_CRED,
(macop_t)mac_mls_create_cred },
{ MAC_EXECVE_TRANSITION,
(macop_t)mac_mls_execve_transition },
{ MAC_EXECVE_WILL_TRANSITION,
(macop_t)mac_mls_execve_will_transition },
{ MAC_CREATE_PROC0,
(macop_t)mac_mls_create_proc0 },
{ MAC_CREATE_PROC1,
(macop_t)mac_mls_create_proc1 },
{ MAC_RELABEL_CRED,
(macop_t)mac_mls_relabel_cred },
{ MAC_CHECK_BPFDESC_RECEIVE,
(macop_t)mac_mls_check_bpfdesc_receive },
{ MAC_CHECK_CRED_RELABEL,
(macop_t)mac_mls_check_cred_relabel },
{ MAC_CHECK_CRED_VISIBLE,
(macop_t)mac_mls_check_cred_visible },
{ MAC_CHECK_IFNET_RELABEL,
(macop_t)mac_mls_check_ifnet_relabel },
{ MAC_CHECK_IFNET_TRANSMIT,
(macop_t)mac_mls_check_ifnet_transmit },
{ MAC_CHECK_MOUNT_STAT,
(macop_t)mac_mls_check_mount_stat },
{ MAC_CHECK_PIPE_IOCTL,
(macop_t)mac_mls_check_pipe_ioctl },
{ MAC_CHECK_PIPE_POLL,
(macop_t)mac_mls_check_pipe_poll },
{ MAC_CHECK_PIPE_READ,
(macop_t)mac_mls_check_pipe_read },
{ MAC_CHECK_PIPE_RELABEL,
(macop_t)mac_mls_check_pipe_relabel },
{ MAC_CHECK_PIPE_STAT,
(macop_t)mac_mls_check_pipe_stat },
{ MAC_CHECK_PIPE_WRITE,
(macop_t)mac_mls_check_pipe_write },
{ MAC_CHECK_PROC_DEBUG,
(macop_t)mac_mls_check_proc_debug },
{ MAC_CHECK_PROC_SCHED,
(macop_t)mac_mls_check_proc_sched },
{ MAC_CHECK_PROC_SIGNAL,
(macop_t)mac_mls_check_proc_signal },
{ MAC_CHECK_SOCKET_DELIVER,
(macop_t)mac_mls_check_socket_deliver },
{ MAC_CHECK_SOCKET_RELABEL,
(macop_t)mac_mls_check_socket_relabel },
{ MAC_CHECK_SOCKET_VISIBLE,
(macop_t)mac_mls_check_socket_visible },
{ MAC_CHECK_VNODE_ACCESS,
(macop_t)mac_mls_check_vnode_access },
{ MAC_CHECK_VNODE_CHDIR,
(macop_t)mac_mls_check_vnode_chdir },
{ MAC_CHECK_VNODE_CHROOT,
(macop_t)mac_mls_check_vnode_chroot },
{ MAC_CHECK_VNODE_CREATE,
(macop_t)mac_mls_check_vnode_create },
{ MAC_CHECK_VNODE_DELETE,
(macop_t)mac_mls_check_vnode_delete },
{ MAC_CHECK_VNODE_DELETEACL,
(macop_t)mac_mls_check_vnode_deleteacl },
{ MAC_CHECK_VNODE_EXEC,
(macop_t)mac_mls_check_vnode_exec },
{ MAC_CHECK_VNODE_GETACL,
(macop_t)mac_mls_check_vnode_getacl },
{ MAC_CHECK_VNODE_GETEXTATTR,
(macop_t)mac_mls_check_vnode_getextattr },
{ MAC_CHECK_VNODE_LOOKUP,
(macop_t)mac_mls_check_vnode_lookup },
{ MAC_CHECK_VNODE_OPEN,
(macop_t)mac_mls_check_vnode_open },
{ MAC_CHECK_VNODE_POLL,
(macop_t)mac_mls_check_vnode_poll },
{ MAC_CHECK_VNODE_READ,
(macop_t)mac_mls_check_vnode_read },
{ MAC_CHECK_VNODE_READDIR,
(macop_t)mac_mls_check_vnode_readdir },
{ MAC_CHECK_VNODE_READLINK,
(macop_t)mac_mls_check_vnode_readlink },
{ MAC_CHECK_VNODE_RELABEL,
(macop_t)mac_mls_check_vnode_relabel },
{ MAC_CHECK_VNODE_RENAME_FROM,
(macop_t)mac_mls_check_vnode_rename_from },
{ MAC_CHECK_VNODE_RENAME_TO,
(macop_t)mac_mls_check_vnode_rename_to },
{ MAC_CHECK_VNODE_REVOKE,
(macop_t)mac_mls_check_vnode_revoke },
{ MAC_CHECK_VNODE_SETACL,
(macop_t)mac_mls_check_vnode_setacl },
{ MAC_CHECK_VNODE_SETEXTATTR,
(macop_t)mac_mls_check_vnode_setextattr },
{ MAC_CHECK_VNODE_SETFLAGS,
(macop_t)mac_mls_check_vnode_setflags },
{ MAC_CHECK_VNODE_SETMODE,
(macop_t)mac_mls_check_vnode_setmode },
{ MAC_CHECK_VNODE_SETOWNER,
(macop_t)mac_mls_check_vnode_setowner },
{ MAC_CHECK_VNODE_SETUTIMES,
(macop_t)mac_mls_check_vnode_setutimes },
{ MAC_CHECK_VNODE_STAT,
(macop_t)mac_mls_check_vnode_stat },
{ MAC_CHECK_VNODE_WRITE,
(macop_t)mac_mls_check_vnode_write },
{ MAC_CHECK_VNODE_MMAP_PERMS,
(macop_t)mac_mls_check_vnode_mmap_perms },
{ MAC_OP_LAST, NULL }
};
MAC_POLICY_SET(mac_mls_ops, trustedbsd_mac_mls, "TrustedBSD MAC/MLS",
MPC_LOADTIME_FLAG_NOTLATE, &mac_mls_slot);
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