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freebsd-dev/sys/security/mac_biba/mac_biba.c
Robert Watson d8a7b7a3cd Introduce support for Mandatory Access Control and extensible 
kernel access control.

Provide implementations of some sample operating system security
policy extensions.  These are not yet hooked up to the build as
other infrastructure is still being committed.  Most of these
work fairly well and are in daily use in our development and (limited)
production environments.  Some are not yet in their final form,
and a number of the labeled policies waste a lot of kernel memory
and will be fixed over the next month or so to be more conservative.
They do give good examples of the flexibility of the MAC framework
for implementing a variety of security policies.

mac_biba:	Implementation of fixed-label Biba integrity policy,
		similar to those found in a number of commercial
		trusted operating systems.  All subjects and objects
		are assigned integrity levels, and information flow
		is controlled based on a read-up, write-down
		policy.  Currently, purely hierarchal.

mac_bsdextended:	Implementation of a "file system firewall",
		which allows the administrator to specify a series
		of rules limiting access by users and groups to
		objects owned by other users and groups.  This
		policy is unlabeled, relying on existing system
		security labeling (file permissions/ownership,
		process credentials).

mac_ifoff:	Secure interface silencing.  Special-purpose module
		to limit inappropriate out-going network traffic
		for silent monitoring scenarios.  Prevents the
		various network stacks from generating any output
		despite an interface being live for reception.

mac_mls:	Implementation of fixed-label Multi-Level Security
		confidentiality policy, similar to those found in
		a number of commercial trusted operating systems.
		All subjects and objects are assigned confidentiality
		levels, and information flow is controlled based on
		a write-up, read-down policy.  Currently, purely
		hiearchal, although non-hierarchal support is in the
		works.

mac_none:	Policy module implementing all MAC policy entry
		points with empty stubs.  A good place to start if
		you want all the prototypes types in for you, and
		don't mind a bit of pruning.  Can be loaded, but
		has no access control impact.  Useful also for
		performance measurements.

mac_seeotheruids:	Policy module implementing a security service
		similar to security.bsd.seeotheruids, only a slightly
		more detailed policy involving exceptions for members
		of specific groups, etc.  This policy is unlabeled,
		relying on existing system security labeling
		(process credentials).

mac_test:	Policy module implementing basic sanity tests for
		label handling.  Attempts to ensure that labels are
		not freed multiple times, etc, etc.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs
2002-07-31 18:07:45 +00:00

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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.
* Biba fixed label mandatory integrity 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_biba/mac_biba.h>
SYSCTL_DECL(_security_mac);
SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0,
"TrustedBSD mac_biba policy controls");
static int mac_biba_enabled = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW,
&mac_biba_enabled, 0, "Enforce MAC/Biba policy");
static int destroyed_not_inited;
SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
&destroyed_not_inited, 0, "Count of labels destroyed but not inited");
static int trust_all_interfaces = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
&trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba");
TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces);
static char trusted_interfaces[128];
SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba");
TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces,
sizeof(trusted_interfaces));
static int mac_biba_revocation_enabled = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW,
&mac_biba_revocation_enabled, 0, "Revoke access to objects on relabel");
TUNABLE_INT("security.mac.biba.revocation_enabled",
&mac_biba_revocation_enabled);
static int mac_biba_slot;
#define SLOT(l) ((struct mac_biba *)LABEL_TO_SLOT((l), mac_biba_slot).l_ptr)
MALLOC_DEFINE(M_MACBIBA, "biba label", "MAC/Biba labels");
static int mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, mode_t acc_mode);
static struct mac_biba *
biba_alloc(int how)
{
struct mac_biba *mac_biba;
mac_biba = malloc(sizeof(struct mac_biba), M_MACBIBA, M_ZERO | how);
return (mac_biba);
}
static void
biba_free(struct mac_biba *mac_biba)
{
if (mac_biba != NULL)
free(mac_biba, M_MACBIBA);
else
atomic_add_int(&destroyed_not_inited, 1);
}
static int
mac_biba_dominate_element(struct mac_biba_element *a,
struct mac_biba_element *b)
{
switch(a->mbe_type) {
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
return (1);
case MAC_BIBA_TYPE_LOW:
switch (b->mbe_type) {
case MAC_BIBA_TYPE_GRADE:
case MAC_BIBA_TYPE_HIGH:
return (0);
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_LOW:
return (1);
default:
panic("mac_biba_dominate_element: b->mbe_type invalid");
}
case MAC_BIBA_TYPE_GRADE:
switch (b->mbe_type) {
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_LOW:
return (1);
case MAC_BIBA_TYPE_HIGH:
return (0);
case MAC_BIBA_TYPE_GRADE:
return (a->mbe_grade >= b->mbe_grade);
default:
panic("mac_biba_dominate_element: b->mbe_type invalid");
}
default:
panic("mac_biba_dominate_element: a->mbe_type invalid");
}
return (0);
}
static int
mac_biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb)
{
return (mac_biba_dominate_element(&rangeb->mb_rangehigh,
&rangea->mb_rangehigh) &&
mac_biba_dominate_element(&rangea->mb_rangelow,
&rangeb->mb_rangelow));
}
static int
mac_biba_single_in_range(struct mac_biba *single, struct mac_biba *range)
{
KASSERT((single->mb_flag & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_single_in_range: a not single"));
KASSERT((range->mb_flag & MAC_BIBA_FLAG_RANGE) != 0,
("mac_biba_single_in_range: b not range"));
return (mac_biba_dominate_element(&range->mb_rangehigh,
&single->mb_single) &&
mac_biba_dominate_element(&single->mb_single,
&range->mb_rangelow));
return (1);
}
static int
mac_biba_dominate_single(struct mac_biba *a, struct mac_biba *b)
{
KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_dominate_single: a not single"));
KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_dominate_single: b not single"));
return (mac_biba_dominate_element(&a->mb_single, &b->mb_single));
}
static int
mac_biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b)
{
if (a->mbe_type == MAC_BIBA_TYPE_EQUAL ||
b->mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade);
}
static int
mac_biba_equal_range(struct mac_biba *a, struct mac_biba *b)
{
KASSERT((a->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
("mac_biba_equal_range: a not range"));
KASSERT((b->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
("mac_biba_equal_range: b not range"));
return (mac_biba_equal_element(&a->mb_rangelow, &b->mb_rangelow) &&
mac_biba_equal_element(&a->mb_rangehigh, &b->mb_rangehigh));
}
static int
mac_biba_equal_single(struct mac_biba *a, struct mac_biba *b)
{
KASSERT((a->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_equal_single: a not single"));
KASSERT((b->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_equal_single: b not single"));
return (mac_biba_equal_element(&a->mb_single, &b->mb_single));
}
static int
mac_biba_high_single(struct mac_biba *mac_biba)
{
return (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_HIGH);
}
static int
mac_biba_valid(struct mac_biba *mac_biba)
{
if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) {
switch (mac_biba->mb_single.mbe_type) {
case MAC_BIBA_TYPE_GRADE:
break;
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
case MAC_BIBA_TYPE_LOW:
if (mac_biba->mb_single.mbe_grade != 0)
return (EINVAL);
break;
default:
return (EINVAL);
}
} else {
if (mac_biba->mb_single.mbe_type != MAC_BIBA_TYPE_UNDEF)
return (EINVAL);
}
if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) {
switch (mac_biba->mb_rangelow.mbe_type) {
case MAC_BIBA_TYPE_GRADE:
break;
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
case MAC_BIBA_TYPE_LOW:
if (mac_biba->mb_rangelow.mbe_grade != 0)
return (EINVAL);
break;
default:
return (EINVAL);
}
switch (mac_biba->mb_rangehigh.mbe_type) {
case MAC_BIBA_TYPE_GRADE:
break;
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
case MAC_BIBA_TYPE_LOW:
if (mac_biba->mb_rangehigh.mbe_grade != 0)
return (EINVAL);
break;
default:
return (EINVAL);
}
if (!mac_biba_dominate_element(&mac_biba->mb_rangehigh,
&mac_biba->mb_rangelow))
return (EINVAL);
} else {
if (mac_biba->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF ||
mac_biba->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF)
return (EINVAL);
}
return (0);
}
static void
mac_biba_set_range(struct mac_biba *mac_biba, u_short typelow,
u_short gradelow, u_short typehigh, u_short gradehigh)
{
mac_biba->mb_rangelow.mbe_type = typelow;
mac_biba->mb_rangelow.mbe_grade = gradelow;
mac_biba->mb_rangehigh.mbe_type = typehigh;
mac_biba->mb_rangehigh.mbe_grade = gradehigh;
mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
static void
mac_biba_set_single(struct mac_biba *mac_biba, u_short type, u_short grade)
{
mac_biba->mb_single.mbe_type = type;
mac_biba->mb_single.mbe_grade = grade;
mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE;
}
static void
mac_biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto)
{
KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
("mac_biba_copy_range: labelfrom not range"));
labelto->mb_rangelow = labelfrom->mb_rangelow;
labelto->mb_rangehigh = labelfrom->mb_rangehigh;
labelto->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
static void
mac_biba_copy_single(struct mac_biba *labelfrom, struct mac_biba *labelto)
{
KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_copy_single: labelfrom not single"));
labelto->mb_single = labelfrom->mb_single;
labelto->mb_flags |= MAC_BIBA_FLAG_SINGLE;
}
static void
mac_biba_copy_single_to_range(struct mac_biba *labelfrom,
struct mac_biba *labelto)
{
KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_copy_single_to_range: labelfrom not single"));
labelto->mb_rangelow = labelfrom->mb_single;
labelto->mb_rangehigh = labelfrom->mb_single;
labelto->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
/*
* Policy module operations.
*/
static void
mac_biba_destroy(struct mac_policy_conf *conf)
{
}
static void
mac_biba_init(struct mac_policy_conf *conf)
{
}
/*
* Label operations.
*/
static void
mac_biba_init_bpfdesc(struct bpf_d *bpf_d, struct label *label)
{
SLOT(label) = biba_alloc(M_WAITOK);
}
static void
mac_biba_init_cred(struct ucred *ucred, struct label *label)
{
SLOT(label) = biba_alloc(M_WAITOK);
}
static void
mac_biba_init_devfsdirent(struct devfs_dirent *devfs_dirent,
struct label *label)
{
SLOT(label) = biba_alloc(M_WAITOK);
}
static void
mac_biba_init_ifnet(struct ifnet *ifnet, struct label *label)
{
SLOT(label) = biba_alloc(M_WAITOK);
}
static void
mac_biba_init_ipq(struct ipq *ipq, struct label *label)
{
SLOT(label) = biba_alloc(M_WAITOK);
}
static int
mac_biba_init_mbuf(struct mbuf *mbuf, int how, struct label *label)
{
SLOT(label) = biba_alloc(how);
if (SLOT(label) == NULL)
return (ENOMEM);
return (0);
}
static void
mac_biba_init_mount(struct mount *mount, struct label *mntlabel,
struct label *fslabel)
{
SLOT(mntlabel) = biba_alloc(M_WAITOK);
SLOT(fslabel) = biba_alloc(M_WAITOK);
}
static void
mac_biba_init_socket(struct socket *socket, struct label *label,
struct label *peerlabel)
{
SLOT(label) = biba_alloc(M_WAITOK);
SLOT(peerlabel) = biba_alloc(M_WAITOK);
}
static void
mac_biba_init_pipe(struct pipe *pipe, struct label *label)
{
SLOT(label) = biba_alloc(M_WAITOK);
}
static void
mac_biba_init_temp(struct label *label)
{
SLOT(label) = biba_alloc(M_WAITOK);
}
static void
mac_biba_init_vnode(struct vnode *vp, struct label *label)
{
SLOT(label) = biba_alloc(M_WAITOK);
}
static void
mac_biba_destroy_bpfdesc(struct bpf_d *bpf_d, struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_biba_destroy_cred(struct ucred *ucred, struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_biba_destroy_devfsdirent(struct devfs_dirent *devfs_dirent,
struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_biba_destroy_ifnet(struct ifnet *ifnet, struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_biba_destroy_ipq(struct ipq *ipq, struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_biba_destroy_mbuf(struct mbuf *mbuf, struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_biba_destroy_mount(struct mount *mount, struct label *mntlabel,
struct label *fslabel)
{
biba_free(SLOT(mntlabel));
SLOT(mntlabel) = NULL;
biba_free(SLOT(fslabel));
SLOT(fslabel) = NULL;
}
static void
mac_biba_destroy_socket(struct socket *socket, struct label *label,
struct label *peerlabel)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
biba_free(SLOT(peerlabel));
SLOT(peerlabel) = NULL;
}
static void
mac_biba_destroy_pipe(struct pipe *pipe, struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_biba_destroy_temp(struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_biba_destroy_vnode(struct vnode *vp, struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
static int
mac_biba_externalize(struct label *label, struct mac *extmac)
{
struct mac_biba *mac_biba;
mac_biba = SLOT(label);
if (mac_biba == NULL) {
printf("mac_biba_externalize: NULL pointer\n");
return (0);
}
extmac->m_biba = *mac_biba;
return (0);
}
static int
mac_biba_internalize(struct label *label, struct mac *extmac)
{
struct mac_biba *mac_biba;
int error;
mac_biba = SLOT(label);
error = mac_biba_valid(mac_biba);
if (error)
return (error);
*mac_biba = extmac->m_biba;
return (0);
}
/*
* Labeling event operations: file system objects, and things that look
* a lot like file system objects.
*/
static void
mac_biba_create_devfs_device(dev_t dev, struct devfs_dirent *devfs_dirent,
struct label *label)
{
struct mac_biba *mac_biba;
int biba_type;
mac_biba = 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)
biba_type = MAC_BIBA_TYPE_EQUAL;
else
biba_type = MAC_BIBA_TYPE_HIGH;
mac_biba_set_single(mac_biba, biba_type, 0);
}
static void
mac_biba_create_devfs_directory(char *dirname, int dirnamelen,
struct devfs_dirent *devfs_dirent, struct label *label)
{
struct mac_biba *mac_biba;
mac_biba = SLOT(label);
mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0);
}
static void
mac_biba_create_devfs_vnode(struct devfs_dirent *devfs_dirent,
struct label *direntlabel, struct vnode *vp, struct label *vnodelabel)
{
struct mac_biba *source, *dest;
source = SLOT(direntlabel);
dest = SLOT(vnodelabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_vnode(struct ucred *cred, struct vnode *parent,
struct label *parentlabel, struct vnode *child, struct label *childlabel)
{
struct mac_biba *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(childlabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_mount(struct ucred *cred, struct mount *mp,
struct label *mntlabel, struct label *fslabel)
{
struct mac_biba *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(mntlabel);
mac_biba_copy_single(source, dest);
dest = SLOT(fslabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_root_mount(struct ucred *cred, struct mount *mp,
struct label *mntlabel, struct label *fslabel)
{
struct mac_biba *mac_biba;
/* Always mount root as high integrity. */
mac_biba = SLOT(fslabel);
mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0);
mac_biba = SLOT(mntlabel);
mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0);
}
static void
mac_biba_relabel_vnode(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, struct label *label)
{
struct mac_biba *source, *dest;
source = SLOT(label);
dest = SLOT(vnodelabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_update_devfsdirent(struct devfs_dirent *devfs_dirent,
struct label *direntlabel, struct vnode *vp, struct label *vnodelabel)
{
struct mac_biba *source, *dest;
source = SLOT(vnodelabel);
dest = SLOT(direntlabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_update_procfsvnode(struct vnode *vp, struct label *vnodelabel,
struct ucred *cred)
{
struct mac_biba *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(vnodelabel);
/*
* Only copy the single, not the range, since vnodes only have
* a single.
*/
mac_biba_copy_single(source, dest);
}
static int
mac_biba_update_vnode_from_externalized(struct vnode *vp,
struct label *vnodelabel, struct mac *extmac)
{
struct mac_biba *source, *dest;
int error;
source = &extmac->m_biba;
dest = SLOT(vnodelabel);
error = mac_biba_valid(source);
if (error)
return (error);
if ((source->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE)
return (EINVAL);
mac_biba_copy_single(source, dest);
return (0);
}
static void
mac_biba_update_vnode_from_mount(struct vnode *vp, struct label *vnodelabel,
struct mount *mp, struct label *fslabel)
{
struct mac_biba *source, *dest;
source = SLOT(fslabel);
dest = SLOT(vnodelabel);
mac_biba_copy_single(source, dest);
}
/*
* Labeling event operations: IPC object.
*/
static void
mac_biba_create_mbuf_from_socket(struct socket *so, struct label *socketlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_biba *source, *dest;
source = SLOT(socketlabel);
dest = SLOT(mbuflabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_socket(struct ucred *cred, struct socket *socket,
struct label *socketlabel)
{
struct mac_biba *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(socketlabel);
mac_biba_copy_single(source, dest);
mac_biba_copy_single_to_range(source, dest);
}
static void
mac_biba_create_pipe(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_biba *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(pipelabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_socket_from_socket(struct socket *oldsocket,
struct label *oldsocketlabel, struct socket *newsocket,
struct label *newsocketlabel)
{
struct mac_biba *source, *dest;
source = SLOT(oldsocketlabel);
dest = SLOT(newsocketlabel);
mac_biba_copy_single(source, dest);
mac_biba_copy_range(source, dest);
}
static void
mac_biba_relabel_socket(struct ucred *cred, struct socket *socket,
struct label *socketlabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(socketlabel);
mac_biba_copy_single(source, dest);
mac_biba_copy_range(source, dest);
}
static void
mac_biba_relabel_pipe(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(pipelabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel,
struct socket *socket, struct label *socketpeerlabel)
{
struct mac_biba *source, *dest;
source = SLOT(mbuflabel);
dest = SLOT(socketpeerlabel);
mac_biba_copy_single(source, dest);
}
/*
* Labeling event operations: network objects.
*/
static void
mac_biba_set_socket_peer_from_socket(struct socket *oldsocket,
struct label *oldsocketlabel, struct socket *newsocket,
struct label *newsocketpeerlabel)
{
struct mac_biba *source, *dest;
source = SLOT(oldsocketlabel);
dest = SLOT(newsocketpeerlabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d,
struct label *bpflabel)
{
struct mac_biba *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(bpflabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel)
{
char tifname[IFNAMSIZ], ifname[IFNAMSIZ], *p, *q;
char tiflist[sizeof(trusted_interfaces)];
struct mac_biba *dest;
int len, grade;
dest = SLOT(ifnetlabel);
if (ifnet->if_type == IFT_LOOP) {
grade = MAC_BIBA_TYPE_EQUAL;
goto set;
}
if (trust_all_interfaces) {
grade = MAC_BIBA_TYPE_HIGH;
goto set;
}
grade = MAC_BIBA_TYPE_LOW;
if (trusted_interfaces[0] == '\0' ||
!strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
goto set;
for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
if(*p != ' ' && *p != '\t')
*q = *p;
snprintf(ifname, IFNAMSIZ, "%s%d", ifnet->if_name, ifnet->if_unit);
for (p = q = tiflist;; p++) {
if (*p == ',' || *p == '\0') {
len = p - q;
if (len < IFNAMSIZ) {
bzero(tifname, sizeof(tifname));
bcopy(q, tifname, len);
if (strcmp(tifname, ifname) == 0) {
grade = MAC_BIBA_TYPE_HIGH;
break;
}
}
if (*p == '\0')
break;
q = p + 1;
}
}
set:
mac_biba_set_single(dest, grade, 0);
mac_biba_set_range(dest, grade, 0, grade, 0);
}
static void
mac_biba_create_ipq(struct mbuf *fragment, struct label *fragmentlabel,
struct ipq *ipq, struct label *ipqlabel)
{
struct mac_biba *source, *dest;
source = SLOT(fragmentlabel);
dest = SLOT(ipqlabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel,
struct mbuf *datagram, struct label *datagramlabel)
{
struct mac_biba *source, *dest;
source = SLOT(ipqlabel);
dest = SLOT(datagramlabel);
/* Just use the head, since we require them all to match. */
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_fragment(struct mbuf *datagram, struct label *datagramlabel,
struct mbuf *fragment, struct label *fragmentlabel)
{
struct mac_biba *source, *dest;
source = SLOT(datagramlabel);
dest = SLOT(fragmentlabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_mbuf_from_mbuf(struct mbuf *oldmbuf,
struct label *oldmbuflabel, struct mbuf *newmbuf,
struct label *newmbuflabel)
{
struct mac_biba *source, *dest;
source = SLOT(oldmbuflabel);
dest = SLOT(newmbuflabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *mbuf, struct label *mbuflabel)
{
struct mac_biba *dest;
dest = SLOT(mbuflabel);
mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0);
}
static void
mac_biba_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel,
struct mbuf *mbuf, struct label *mbuflabel)
{
struct mac_biba *source, *dest;
source = SLOT(bpflabel);
dest = SLOT(mbuflabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_biba *source, *dest;
source = SLOT(ifnetlabel);
dest = SLOT(mbuflabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_mbuf_multicast_encap(struct mbuf *oldmbuf,
struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *newmbuf, struct label *newmbuflabel)
{
struct mac_biba *source, *dest;
source = SLOT(oldmbuflabel);
dest = SLOT(newmbuflabel);
mac_biba_copy_single(source, dest);
}
static void
mac_biba_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel,
struct mbuf *newmbuf, struct label *newmbuflabel)
{
struct mac_biba *source, *dest;
source = SLOT(oldmbuflabel);
dest = SLOT(newmbuflabel);
mac_biba_copy_single(source, dest);
}
static int
mac_biba_fragment_match(struct mbuf *fragment, struct label *fragmentlabel,
struct ipq *ipq, struct label *ipqlabel)
{
struct mac_biba *a, *b;
a = SLOT(ipqlabel);
b = SLOT(fragmentlabel);
return (mac_biba_equal_single(a, b));
}
static void
mac_biba_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet,
struct label *ifnetlabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(ifnetlabel);
mac_biba_copy_single(source, dest);
mac_biba_copy_range(source, dest);
}
static void
mac_biba_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_biba_create_cred(struct ucred *cred_parent, struct ucred *cred_child)
{
struct mac_biba *source, *dest;
source = SLOT(&cred_parent->cr_label);
dest = SLOT(&cred_child->cr_label);
mac_biba_copy_single(source, dest);
mac_biba_copy_range(source, dest);
}
static void
mac_biba_execve_transition(struct ucred *old, struct ucred *new,
struct vnode *vp, struct mac *vnodelabel)
{
struct mac_biba *source, *dest;
source = SLOT(&old->cr_label);
dest = SLOT(&new->cr_label);
mac_biba_copy_single(source, dest);
mac_biba_copy_range(source, dest);
}
static int
mac_biba_execve_will_transition(struct ucred *old, struct vnode *vp,
struct mac *vnodelabel)
{
return (0);
}
static void
mac_biba_create_proc0(struct ucred *cred)
{
struct mac_biba *dest;
dest = SLOT(&cred->cr_label);
mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0);
mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, MAC_BIBA_TYPE_HIGH, 0);
}
static void
mac_biba_create_proc1(struct ucred *cred)
{
struct mac_biba *dest;
dest = SLOT(&cred->cr_label);
mac_biba_set_single(dest, MAC_BIBA_TYPE_HIGH, 0);
mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, MAC_BIBA_TYPE_HIGH, 0);
}
static void
mac_biba_relabel_cred(struct ucred *cred, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(&cred->cr_label);
mac_biba_copy_single(source, dest);
mac_biba_copy_range(source, dest);
}
/*
* Access control checks.
*/
static int
mac_biba_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel,
struct ifnet *ifnet, struct label *ifnetlabel)
{
struct mac_biba *a, *b;
if (!mac_biba_enabled)
return (0);
a = SLOT(bpflabel);
b = SLOT(ifnetlabel);
if (mac_biba_equal_single(a, b))
return (0);
return (EACCES);
}
static int
mac_biba_check_cred_relabel(struct ucred *cred, struct label *newlabel)
{
struct mac_biba *subj, *new;
subj = SLOT(&cred->cr_label);
new = SLOT(newlabel);
if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_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_biba_single_in_range(new, subj))
return (EPERM);
/*
* The new range must be in the old range.
*/
if (!mac_biba_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_biba_check_cred_visible(struct ucred *u1, struct ucred *u2)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&u1->cr_label);
obj = SLOT(&u2->cr_label);
/* XXX: range */
if (!mac_biba_dominate_single(obj, subj))
return (ESRCH);
return (0);
}
static int
mac_biba_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet,
struct label *ifnetlabel, struct label *newlabel)
{
struct mac_biba *subj, *new;
subj = SLOT(&cred->cr_label);
new = SLOT(newlabel);
if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAGS_BOTH)
return (EINVAL);
/*
* XXX: Only Biba HIGH subjects may relabel interfaces. */
if (!mac_biba_high_single(subj))
return (EPERM);
return (suser_cred(cred, 0));
}
static int
mac_biba_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_biba *p, *i;
if (!mac_biba_enabled)
return (0);
p = SLOT(mbuflabel);
i = SLOT(ifnetlabel);
return (mac_biba_single_in_range(p, i) ? 0 : EACCES);
}
static int
mac_biba_check_mount_stat(struct ucred *cred, struct mount *mp,
struct label *mntlabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(mntlabel);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data)
{
if(!mac_biba_enabled)
return (0);
/* XXX: This will be implemented soon... */
return (0);
}
static int
mac_biba_check_pipe_op(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, int op)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
switch(op) {
case MAC_OP_PIPE_READ:
case MAC_OP_PIPE_STAT:
case MAC_OP_PIPE_POLL:
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
break;
case MAC_OP_PIPE_WRITE:
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
break;
default:
panic("mac_biba_check_pipe_op: invalid pipe operation");
}
return (0);
}
static int
mac_biba_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, struct label *newlabel)
{
struct mac_biba *subj, *obj, *new;
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
obj = SLOT(pipelabel);
if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE)
return (EINVAL);
/*
* To relabel a pipe, the old pipe label must be in the subject
* range.
*/
if (!mac_biba_single_in_range(obj, subj))
return (EPERM);
/*
* To relabel a pipe, the new pipe label must be in the subject
* range.
*/
if (!mac_biba_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_biba_check_proc_debug(struct ucred *cred, struct proc *proc)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(&proc->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_biba_dominate_single(obj, subj))
return (ESRCH);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_proc_sched(struct ucred *cred, struct proc *proc)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(&proc->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_biba_dominate_single(obj, subj))
return (ESRCH);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(&proc->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_biba_dominate_single(obj, subj))
return (ESRCH);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_socket_receive(struct socket *so, struct label *socketlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_biba *p, *s;
if (!mac_biba_enabled)
return (0);
p = SLOT(mbuflabel);
s = SLOT(socketlabel);
return (mac_biba_equal_single(p, s) ? 0 : EACCES);
}
static int
mac_biba_check_socket_relabel(struct ucred *cred, struct socket *socket,
struct label *socketlabel, struct label *newlabel)
{
struct mac_biba *subj, *obj, *new;
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
obj = SLOT(socketlabel);
if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE)
return (EINVAL);
/*
* To relabel a socket, the old socket label must be in the subject
* range.
*/
if (!mac_biba_single_in_range(obj, subj))
return (EPERM);
/*
* To relabel a socket, the new socket label must be in the subject
* range.
*/
if (!mac_biba_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_biba_check_socket_visible(struct ucred *cred, struct socket *socket,
struct label *socketlabel)
{
struct mac_biba *subj, *obj;
subj = SLOT(&cred->cr_label);
obj = SLOT(socketlabel);
if (!mac_biba_dominate_single(obj, subj))
return (ENOENT);
return (0);
}
static int
mac_biba_check_vnode_access(struct ucred *cred, struct vnode *vp,
struct label *label, mode_t flags)
{
return (mac_biba_check_vnode_open(cred, vp, label, flags));
}
static int
mac_biba_check_vnode_chdir(struct ucred *cred, struct vnode *dvp,
struct label *dlabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_chroot(struct ucred *cred, struct vnode *dvp,
struct label *dlabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_create(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct componentname *cnp, struct vattr *vap)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_delete(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct vnode *vp, struct label *label,
struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
obj = SLOT(label);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
struct label *label, acl_type_t type)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_exec(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_getacl(struct ucred *cred, struct vnode *vp,
struct label *label, acl_type_t type)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
struct label *label, int attrnamespace, const char *name, struct uio *uio)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, mode_t acc_mode)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
/* XXX privilege override for admin? */
if (acc_mode & (VREAD | VEXEC | VSTAT)) {
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
}
if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_biba_check_vnode_readdir(struct ucred *cred, struct vnode *dvp,
struct label *dlabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_readlink(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, struct label *newlabel)
{
struct mac_biba *old, *new, *subj;
old = SLOT(vnodelabel);
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE)
return (EINVAL);
/*
* To relabel a vnode, the old vnode label must be in the subject
* range.
*/
if (!mac_biba_single_in_range(old, subj))
return (EPERM);
/*
* To relabel a vnode, the new vnode label must be in the subject
* range.
*/
if (!mac_biba_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_biba_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct vnode *vp, struct label *label,
struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
obj = SLOT(label);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_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_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
if (vp != NULL) {
obj = SLOT(label);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_biba_check_vnode_revoke(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setacl(struct ucred *cred, struct vnode *vp,
struct label *label, acl_type_t type, struct acl *acl)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, int attrnamespace, const char *name,
struct uio *uio)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
/* XXX: protect the MAC EA in a special way? */
return (0);
}
static int
mac_biba_check_vnode_setflags(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, u_long flags)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setmode(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, mode_t mode)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setowner(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, uid_t uid, gid_t gid)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, struct timespec atime, struct timespec mtime)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_stat(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static vm_prot_t
mac_biba_check_vnode_mmap_perms(struct ucred *cred, struct vnode *vp,
struct label *label, int newmapping)
{
struct mac_biba *subj, *obj;
vm_prot_t prot = 0;
if (!mac_biba_enabled || (!mac_biba_revocation_enabled && !newmapping))
return (VM_PROT_ALL);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (mac_biba_dominate_single(obj, subj))
prot |= VM_PROT_READ | VM_PROT_EXECUTE;
if (mac_biba_dominate_single(subj, obj))
prot |= VM_PROT_WRITE;
return (prot);
}
static int
mac_biba_check_vnode_op(struct ucred *cred, struct vnode *vp,
struct label *label, int op)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled || !mac_biba_revocation_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
switch (op) {
case MAC_OP_VNODE_POLL:
case MAC_OP_VNODE_READ:
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
case MAC_OP_VNODE_WRITE:
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
default:
printf("mac_biba_check_vnode_op: unknown operation %d\n", op);
return (EINVAL);
}
}
static struct mac_policy_op_entry mac_biba_ops[] =
{
{ MAC_DESTROY,
(macop_t)mac_biba_destroy },
{ MAC_INIT,
(macop_t)mac_biba_init },
{ MAC_INIT_BPFDESC,
(macop_t)mac_biba_init_bpfdesc },
{ MAC_INIT_CRED,
(macop_t)mac_biba_init_cred },
{ MAC_INIT_DEVFSDIRENT,
(macop_t)mac_biba_init_devfsdirent },
{ MAC_INIT_IFNET,
(macop_t)mac_biba_init_ifnet },
{ MAC_INIT_IPQ,
(macop_t)mac_biba_init_ipq },
{ MAC_INIT_MBUF,
(macop_t)mac_biba_init_mbuf },
{ MAC_INIT_MOUNT,
(macop_t)mac_biba_init_mount },
{ MAC_INIT_PIPE,
(macop_t)mac_biba_init_pipe },
{ MAC_INIT_SOCKET,
(macop_t)mac_biba_init_socket },
{ MAC_INIT_TEMP,
(macop_t)mac_biba_init_temp },
{ MAC_INIT_VNODE,
(macop_t)mac_biba_init_vnode },
{ MAC_DESTROY_BPFDESC,
(macop_t)mac_biba_destroy_bpfdesc },
{ MAC_DESTROY_CRED,
(macop_t)mac_biba_destroy_cred },
{ MAC_DESTROY_DEVFSDIRENT,
(macop_t)mac_biba_destroy_devfsdirent },
{ MAC_DESTROY_IFNET,
(macop_t)mac_biba_destroy_ifnet },
{ MAC_DESTROY_IPQ,
(macop_t)mac_biba_destroy_ipq },
{ MAC_DESTROY_MBUF,
(macop_t)mac_biba_destroy_mbuf },
{ MAC_DESTROY_MOUNT,
(macop_t)mac_biba_destroy_mount },
{ MAC_DESTROY_PIPE,
(macop_t)mac_biba_destroy_pipe },
{ MAC_DESTROY_SOCKET,
(macop_t)mac_biba_destroy_socket },
{ MAC_DESTROY_TEMP,
(macop_t)mac_biba_destroy_temp },
{ MAC_DESTROY_VNODE,
(macop_t)mac_biba_destroy_vnode },
{ MAC_EXTERNALIZE,
(macop_t)mac_biba_externalize },
{ MAC_INTERNALIZE,
(macop_t)mac_biba_internalize },
{ MAC_CREATE_DEVFS_DEVICE,
(macop_t)mac_biba_create_devfs_device },
{ MAC_CREATE_DEVFS_DIRECTORY,
(macop_t)mac_biba_create_devfs_directory },
{ MAC_CREATE_DEVFS_VNODE,
(macop_t)mac_biba_create_devfs_vnode },
{ MAC_CREATE_VNODE,
(macop_t)mac_biba_create_vnode },
{ MAC_CREATE_MOUNT,
(macop_t)mac_biba_create_mount },
{ MAC_CREATE_ROOT_MOUNT,
(macop_t)mac_biba_create_root_mount },
{ MAC_RELABEL_VNODE,
(macop_t)mac_biba_relabel_vnode },
{ MAC_UPDATE_DEVFSDIRENT,
(macop_t)mac_biba_update_devfsdirent },
{ MAC_UPDATE_PROCFSVNODE,
(macop_t)mac_biba_update_procfsvnode },
{ MAC_UPDATE_VNODE_FROM_EXTERNALIZED,
(macop_t)mac_biba_update_vnode_from_externalized },
{ MAC_UPDATE_VNODE_FROM_MOUNT,
(macop_t)mac_biba_update_vnode_from_mount },
{ MAC_CREATE_MBUF_FROM_SOCKET,
(macop_t)mac_biba_create_mbuf_from_socket },
{ MAC_CREATE_PIPE,
(macop_t)mac_biba_create_pipe },
{ MAC_CREATE_SOCKET,
(macop_t)mac_biba_create_socket },
{ MAC_CREATE_SOCKET_FROM_SOCKET,
(macop_t)mac_biba_create_socket_from_socket },
{ MAC_RELABEL_PIPE,
(macop_t)mac_biba_relabel_pipe },
{ MAC_RELABEL_SOCKET,
(macop_t)mac_biba_relabel_socket },
{ MAC_SET_SOCKET_PEER_FROM_MBUF,
(macop_t)mac_biba_set_socket_peer_from_mbuf },
{ MAC_SET_SOCKET_PEER_FROM_SOCKET,
(macop_t)mac_biba_set_socket_peer_from_socket },
{ MAC_CREATE_BPFDESC,
(macop_t)mac_biba_create_bpfdesc },
{ MAC_CREATE_DATAGRAM_FROM_IPQ,
(macop_t)mac_biba_create_datagram_from_ipq },
{ MAC_CREATE_FRAGMENT,
(macop_t)mac_biba_create_fragment },
{ MAC_CREATE_IFNET,
(macop_t)mac_biba_create_ifnet },
{ MAC_CREATE_IPQ,
(macop_t)mac_biba_create_ipq },
{ MAC_CREATE_MBUF_FROM_MBUF,
(macop_t)mac_biba_create_mbuf_from_mbuf },
{ MAC_CREATE_MBUF_LINKLAYER,
(macop_t)mac_biba_create_mbuf_linklayer },
{ MAC_CREATE_MBUF_FROM_BPFDESC,
(macop_t)mac_biba_create_mbuf_from_bpfdesc },
{ MAC_CREATE_MBUF_FROM_IFNET,
(macop_t)mac_biba_create_mbuf_from_ifnet },
{ MAC_CREATE_MBUF_MULTICAST_ENCAP,
(macop_t)mac_biba_create_mbuf_multicast_encap },
{ MAC_CREATE_MBUF_NETLAYER,
(macop_t)mac_biba_create_mbuf_netlayer },
{ MAC_FRAGMENT_MATCH,
(macop_t)mac_biba_fragment_match },
{ MAC_RELABEL_IFNET,
(macop_t)mac_biba_relabel_ifnet },
{ MAC_UPDATE_IPQ,
(macop_t)mac_biba_update_ipq },
{ MAC_CREATE_CRED,
(macop_t)mac_biba_create_cred },
{ MAC_EXECVE_TRANSITION,
(macop_t)mac_biba_execve_transition },
{ MAC_EXECVE_WILL_TRANSITION,
(macop_t)mac_biba_execve_will_transition },
{ MAC_CREATE_PROC0,
(macop_t)mac_biba_create_proc0 },
{ MAC_CREATE_PROC1,
(macop_t)mac_biba_create_proc1 },
{ MAC_RELABEL_CRED,
(macop_t)mac_biba_relabel_cred },
{ MAC_CHECK_BPFDESC_RECEIVE,
(macop_t)mac_biba_check_bpfdesc_receive },
{ MAC_CHECK_CRED_RELABEL,
(macop_t)mac_biba_check_cred_relabel },
{ MAC_CHECK_CRED_VISIBLE,
(macop_t)mac_biba_check_cred_visible },
{ MAC_CHECK_IFNET_RELABEL,
(macop_t)mac_biba_check_ifnet_relabel },
{ MAC_CHECK_IFNET_TRANSMIT,
(macop_t)mac_biba_check_ifnet_transmit },
{ MAC_CHECK_MOUNT_STAT,
(macop_t)mac_biba_check_mount_stat },
{ MAC_CHECK_PIPE_IOCTL,
(macop_t)mac_biba_check_pipe_ioctl },
{ MAC_CHECK_PIPE_OP,
(macop_t)mac_biba_check_pipe_op },
{ MAC_CHECK_PIPE_RELABEL,
(macop_t)mac_biba_check_pipe_relabel },
{ MAC_CHECK_PROC_DEBUG,
(macop_t)mac_biba_check_proc_debug },
{ MAC_CHECK_PROC_SCHED,
(macop_t)mac_biba_check_proc_sched },
{ MAC_CHECK_PROC_SIGNAL,
(macop_t)mac_biba_check_proc_signal },
{ MAC_CHECK_SOCKET_RECEIVE,
(macop_t)mac_biba_check_socket_receive },
{ MAC_CHECK_SOCKET_RELABEL,
(macop_t)mac_biba_check_socket_relabel },
{ MAC_CHECK_SOCKET_VISIBLE,
(macop_t)mac_biba_check_socket_visible },
{ MAC_CHECK_VNODE_ACCESS,
(macop_t)mac_biba_check_vnode_access },
{ MAC_CHECK_VNODE_CHDIR,
(macop_t)mac_biba_check_vnode_chdir },
{ MAC_CHECK_VNODE_CHROOT,
(macop_t)mac_biba_check_vnode_chroot },
{ MAC_CHECK_VNODE_CREATE,
(macop_t)mac_biba_check_vnode_create },
{ MAC_CHECK_VNODE_DELETE,
(macop_t)mac_biba_check_vnode_delete },
{ MAC_CHECK_VNODE_DELETEACL,
(macop_t)mac_biba_check_vnode_deleteacl },
{ MAC_CHECK_VNODE_EXEC,
(macop_t)mac_biba_check_vnode_exec },
{ MAC_CHECK_VNODE_GETACL,
(macop_t)mac_biba_check_vnode_getacl },
{ MAC_CHECK_VNODE_GETEXTATTR,
(macop_t)mac_biba_check_vnode_getextattr },
{ MAC_CHECK_VNODE_LOOKUP,
(macop_t)mac_biba_check_vnode_lookup },
{ MAC_CHECK_VNODE_OPEN,
(macop_t)mac_biba_check_vnode_open },
{ MAC_CHECK_VNODE_READDIR,
(macop_t)mac_biba_check_vnode_readdir },
{ MAC_CHECK_VNODE_READLINK,
(macop_t)mac_biba_check_vnode_readlink },
{ MAC_CHECK_VNODE_RELABEL,
(macop_t)mac_biba_check_vnode_relabel },
{ MAC_CHECK_VNODE_RENAME_FROM,
(macop_t)mac_biba_check_vnode_rename_from },
{ MAC_CHECK_VNODE_RENAME_TO,
(macop_t)mac_biba_check_vnode_rename_to },
{ MAC_CHECK_VNODE_REVOKE,
(macop_t)mac_biba_check_vnode_revoke },
{ MAC_CHECK_VNODE_SETACL,
(macop_t)mac_biba_check_vnode_setacl },
{ MAC_CHECK_VNODE_SETEXTATTR,
(macop_t)mac_biba_check_vnode_setextattr },
{ MAC_CHECK_VNODE_SETFLAGS,
(macop_t)mac_biba_check_vnode_setflags },
{ MAC_CHECK_VNODE_SETMODE,
(macop_t)mac_biba_check_vnode_setmode },
{ MAC_CHECK_VNODE_SETOWNER,
(macop_t)mac_biba_check_vnode_setowner },
{ MAC_CHECK_VNODE_SETUTIMES,
(macop_t)mac_biba_check_vnode_setutimes },
{ MAC_CHECK_VNODE_STAT,
(macop_t)mac_biba_check_vnode_stat },
{ MAC_CHECK_VNODE_MMAP_PERMS,
(macop_t)mac_biba_check_vnode_mmap_perms },
{ MAC_CHECK_VNODE_OP,
(macop_t)mac_biba_check_vnode_op },
{ MAC_OP_LAST, NULL }
};
MAC_POLICY_SET(mac_biba_ops, trustedbsd_mac_biba, "TrustedBSD MAC/Biba",
MPC_LOADTIME_FLAG_NOTLATE, &mac_biba_slot);
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