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freebsd-dev/sys/security/mac_biba/mac_biba.c
Robert Watson f51e58036e Redesign the externalization APIs from the MAC Framework to 
the MAC policy modules to improve robustness against C string
bugs and vulnerabilities.  Following these revisions, all
string construction of labels for export to userspace (or
elsewhere) is performed using the sbuf API, which prevents
the consumer from having to perform laborious and intricate
pointer and buffer checks.  This substantially simplifies
the externalization logic, both at the MAC Framework level,
and in individual policies; this becomes especially useful
when policies export more complex label data, such as with
compartments in Biba and MLS.

Bundled in here are some other minor fixes associated with
externalization: including avoiding malloc while holding the
process mutex in mac_lomac, and hence avoid a failure mode
when printing labels during a downgrade operation due to
the removal of the M_NOWAIT case.

This has been running in the MAC development tree for about
three weeks without problems.

Obtained from:	TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories
2003-06-23 01:26:34 +00:00

2733 lines
64 KiB
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/*-
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
* Copyright (c) 2001, 2002, 2003 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 Network
* Associates Laboratories, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
* as part of the DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Developed by the TrustedBSD Project.
* Biba fixed label mandatory integrity policy.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/acl.h>
#include <sys/conf.h>
#include <sys/extattr.h>
#include <sys/kernel.h>
#include <sys/mac.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/sysent.h>
#include <sys/systm.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_label_size = sizeof(struct mac_biba);
SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD,
&mac_biba_label_size, 0, "Size of struct mac_biba");
static int mac_biba_enabled = 1;
SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW,
&mac_biba_enabled, 0, "Enforce MAC/Biba policy");
TUNABLE_INT("security.mac.biba.enabled", &mac_biba_enabled);
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 max_compartments = MAC_BIBA_MAX_COMPARTMENTS;
SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD,
&max_compartments, 0, "Maximum supported compartments");
static int ptys_equal = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW,
&ptys_equal, 0, "Label pty devices as biba/equal on create");
TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal);
static int revocation_enabled = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW,
&revocation_enabled, 0, "Revoke access to objects on relabel");
TUNABLE_INT("security.mac.biba.revocation_enabled", &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 __inline int
biba_bit_set_empty(u_char *set) {
int i;
for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++)
if (set[i] != 0)
return (0);
return (1);
}
static struct mac_biba *
biba_alloc(int flag)
{
struct mac_biba *mac_biba;
mac_biba = malloc(sizeof(struct mac_biba), M_MACBIBA, M_ZERO | flag);
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
biba_atmostflags(struct mac_biba *mac_biba, int flags)
{
if ((mac_biba->mb_flags & flags) != mac_biba->mb_flags)
return (EINVAL);
return (0);
}
static int
mac_biba_dominate_element(struct mac_biba_element *a,
struct mac_biba_element *b)
{
int bit;
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:
for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++)
if (!MAC_BIBA_BIT_TEST(bit,
a->mbe_compartments) &&
MAC_BIBA_BIT_TEST(bit, b->mbe_compartments))
return (0);
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_subject_dominate_high(struct mac_biba *mac_biba)
{
struct mac_biba_element *element;
KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_single_in_range: mac_biba not single"));
element = &mac_biba->mb_single;
return (element->mbe_type == MAC_BIBA_TYPE_EQUAL ||
element->mbe_type == MAC_BIBA_TYPE_HIGH);
}
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_flags & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_single_in_range: a not single"));
KASSERT((range->mb_flags & 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_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_contains_equal(struct mac_biba *mac_biba)
{
if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE)
if (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) {
if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
if (mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
}
return (0);
}
static int
mac_biba_subject_privileged(struct mac_biba *mac_biba)
{
KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
MAC_BIBA_FLAGS_BOTH,
("mac_biba_subject_privileged: subject doesn't have both labels"));
/* If the single is EQUAL, it's ok. */
if (mac_biba->mb_single.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (0);
/* If either range endpoint is EQUAL, it's ok. */
if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL ||
mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (0);
/* If the range is low-high, it's ok. */
if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW &&
mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH)
return (0);
/* It's not ok. */
return (EPERM);
}
static int
mac_biba_high_single(struct mac_biba *mac_biba)
{
KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) != 0,
("mac_biba_equal_single: mac_biba not single"));
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 ||
!MAC_BIBA_BIT_SET_EMPTY(
mac_biba->mb_single.mbe_compartments))
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 ||
!MAC_BIBA_BIT_SET_EMPTY(
mac_biba->mb_rangelow.mbe_compartments))
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 ||
!MAC_BIBA_BIT_SET_EMPTY(
mac_biba->mb_rangehigh.mbe_compartments))
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_char *compartmentslow, u_short typehigh,
u_short gradehigh, u_char *compartmentshigh)
{
mac_biba->mb_rangelow.mbe_type = typelow;
mac_biba->mb_rangelow.mbe_grade = gradelow;
if (compartmentslow != NULL)
memcpy(mac_biba->mb_rangelow.mbe_compartments,
compartmentslow,
sizeof(mac_biba->mb_rangelow.mbe_compartments));
mac_biba->mb_rangehigh.mbe_type = typehigh;
mac_biba->mb_rangehigh.mbe_grade = gradehigh;
if (compartmentshigh != NULL)
memcpy(mac_biba->mb_rangehigh.mbe_compartments,
compartmentshigh,
sizeof(mac_biba->mb_rangehigh.mbe_compartments));
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,
u_char *compartments)
{
mac_biba->mb_single.mbe_type = type;
mac_biba->mb_single.mbe_grade = grade;
if (compartments != NULL)
memcpy(mac_biba->mb_single.mbe_compartments, compartments,
sizeof(mac_biba->mb_single.mbe_compartments));
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(struct mac_biba *source, struct mac_biba *dest)
{
if (source->mb_flags & MAC_BIBA_FLAG_SINGLE)
mac_biba_copy_single(source, dest);
if (source->mb_flags & MAC_BIBA_FLAG_RANGE)
mac_biba_copy_range(source, dest);
}
/*
* 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_label(struct label *label)
{
SLOT(label) = biba_alloc(M_WAITOK);
}
static int
mac_biba_init_label_waitcheck(struct label *label, int flag)
{
SLOT(label) = biba_alloc(flag);
if (SLOT(label) == NULL)
return (ENOMEM);
return (0);
}
static void
mac_biba_destroy_label(struct label *label)
{
biba_free(SLOT(label));
SLOT(label) = NULL;
}
/*
* mac_biba_element_to_string() accepts an sbuf and Biba element. It
* converts the Biba element to a string and stores the result in the
* sbuf; if there isn't space in the sbuf, -1 is returned.
*/
static int
mac_biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element)
{
int i, first;
switch (element->mbe_type) {
case MAC_BIBA_TYPE_HIGH:
return (sbuf_printf(sb, "high"));
case MAC_BIBA_TYPE_LOW:
return (sbuf_printf(sb, "low"));
case MAC_BIBA_TYPE_EQUAL:
return (sbuf_printf(sb, "equal"));
case MAC_BIBA_TYPE_GRADE:
if (sbuf_printf(sb, "%d", element->mbe_grade) == -1)
return (-1);
first = 1;
for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) {
if (MAC_BIBA_BIT_TEST(i, element->mbe_compartments)) {
if (first) {
if (sbuf_putc(sb, ':') == -1)
return (-1);
if (sbuf_printf(sb, "%d", i) == -1)
return (-1);
first = 0;
} else {
if (sbuf_printf(sb, "+%d", i) == -1)
return (-1);
}
}
}
return (0);
default:
panic("mac_biba_element_to_string: invalid type (%d)",
element->mbe_type);
}
}
/*
* mac_biba_to_string() converts a Biba label to a string, and places
* the results in the passed sbuf. It returns 0 on success, or EINVAL
* if there isn't room in the sbuf. Note: the sbuf will be modified
* even in a failure case, so the caller may need to revert the sbuf
* by restoring the offset if that's undesired.
*/
static int
mac_biba_to_string(struct sbuf *sb, struct mac_biba *mac_biba)
{
if (mac_biba->mb_flags & MAC_BIBA_FLAG_SINGLE) {
if (mac_biba_element_to_string(sb, &mac_biba->mb_single)
== -1)
return (EINVAL);
}
if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) {
if (sbuf_putc(sb, '(') == -1)
return (EINVAL);
if (mac_biba_element_to_string(sb, &mac_biba->mb_rangelow)
== -1)
return (EINVAL);
if (sbuf_putc(sb, '-') == -1)
return (EINVAL);
if (mac_biba_element_to_string(sb, &mac_biba->mb_rangehigh)
== -1)
return (EINVAL);
if (sbuf_putc(sb, ')') == -1)
return (EINVAL);
}
return (0);
}
static int
mac_biba_externalize_label(struct label *label, char *element_name,
struct sbuf *sb, int *claimed)
{
struct mac_biba *mac_biba;
if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
mac_biba = SLOT(label);
return (mac_biba_to_string(sb, mac_biba));
}
static int
mac_biba_parse_element(struct mac_biba_element *element, char *string)
{
char *compartment, *end, *grade;
int value;
if (strcmp(string, "high") == 0 ||
strcmp(string, "hi") == 0) {
element->mbe_type = MAC_BIBA_TYPE_HIGH;
element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
} else if (strcmp(string, "low") == 0 ||
strcmp(string, "lo") == 0) {
element->mbe_type = MAC_BIBA_TYPE_LOW;
element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
} else if (strcmp(string, "equal") == 0 ||
strcmp(string, "eq") == 0) {
element->mbe_type = MAC_BIBA_TYPE_EQUAL;
element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
} else {
element->mbe_type = MAC_BIBA_TYPE_GRADE;
/*
* Numeric grade piece of the element.
*/
grade = strsep(&string, ":");
value = strtol(grade, &end, 10);
if (end == grade || *end != '\0')
return (EINVAL);
if (value < 0 || value > 65535)
return (EINVAL);
element->mbe_grade = value;
/*
* Optional compartment piece of the element. If none
* are included, we assume that the label has no
* compartments.
*/
if (string == NULL)
return (0);
if (*string == '\0')
return (0);
while ((compartment = strsep(&string, "+")) != NULL) {
value = strtol(compartment, &end, 10);
if (compartment == end || *end != '\0')
return (EINVAL);
if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS)
return (EINVAL);
MAC_BIBA_BIT_SET(value, element->mbe_compartments);
}
}
return (0);
}
/*
* Note: destructively consumes the string, make a local copy before
* calling if that's a problem.
*/
static int
mac_biba_parse(struct mac_biba *mac_biba, char *string)
{
char *rangehigh, *rangelow, *single;
int error;
single = strsep(&string, "(");
if (*single == '\0')
single = NULL;
if (string != NULL) {
rangelow = strsep(&string, "-");
if (string == NULL)
return (EINVAL);
rangehigh = strsep(&string, ")");
if (string == NULL)
return (EINVAL);
if (*string != '\0')
return (EINVAL);
} else {
rangelow = NULL;
rangehigh = NULL;
}
KASSERT((rangelow != NULL && rangehigh != NULL) ||
(rangelow == NULL && rangehigh == NULL),
("mac_biba_parse: range mismatch"));
bzero(mac_biba, sizeof(*mac_biba));
if (single != NULL) {
error = mac_biba_parse_element(&mac_biba->mb_single, single);
if (error)
return (error);
mac_biba->mb_flags |= MAC_BIBA_FLAG_SINGLE;
}
if (rangelow != NULL) {
error = mac_biba_parse_element(&mac_biba->mb_rangelow,
rangelow);
if (error)
return (error);
error = mac_biba_parse_element(&mac_biba->mb_rangehigh,
rangehigh);
if (error)
return (error);
mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
error = mac_biba_valid(mac_biba);
if (error)
return (error);
return (0);
}
static int
mac_biba_internalize_label(struct label *label, char *element_name,
char *element_data, int *claimed)
{
struct mac_biba *mac_biba, mac_biba_temp;
int error;
if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
error = mac_biba_parse(&mac_biba_temp, element_data);
if (error)
return (error);
mac_biba = SLOT(label);
*mac_biba = mac_biba_temp;
return (0);
}
static void
mac_biba_copy_label(struct label *src, struct label *dest)
{
*SLOT(dest) = *SLOT(src);
}
/*
* Labeling event operations: file system objects, and things that look
* a lot like file system objects.
*/
static void
mac_biba_create_devfs_device(struct mount *mp, 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 if (ptys_equal &&
(strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
biba_type = MAC_BIBA_TYPE_EQUAL;
else
biba_type = MAC_BIBA_TYPE_HIGH;
mac_biba_set_single(mac_biba, biba_type, 0, NULL);
}
static void
mac_biba_create_devfs_directory(struct mount *mp, 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, NULL);
}
static void
mac_biba_create_devfs_symlink(struct ucred *cred, struct mount *mp,
struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
struct label *delabel)
{
struct mac_biba *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(delabel);
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, NULL);
mac_biba = SLOT(mntlabel);
mac_biba_set_single(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL);
}
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(source, dest);
}
static void
mac_biba_update_devfsdirent(struct mount *mp,
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(source, dest);
}
static void
mac_biba_associate_vnode_devfs(struct mount *mp, struct label *fslabel,
struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
struct label *vlabel)
{
struct mac_biba *source, *dest;
source = SLOT(delabel);
dest = SLOT(vlabel);
mac_biba_copy_single(source, dest);
}
static int
mac_biba_associate_vnode_extattr(struct mount *mp, struct label *fslabel,
struct vnode *vp, struct label *vlabel)
{
struct mac_biba temp, *source, *dest;
int buflen, error;
source = SLOT(fslabel);
dest = SLOT(vlabel);
buflen = sizeof(temp);
bzero(&temp, buflen);
error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &temp, curthread);
if (error == ENOATTR || error == EOPNOTSUPP) {
/* Fall back to the fslabel. */
mac_biba_copy_single(source, dest);
return (0);
} else if (error)
return (error);
if (buflen != sizeof(temp)) {
printf("mac_biba_associate_vnode_extattr: bad size %d\n",
buflen);
return (EPERM);
}
if (mac_biba_valid(&temp) != 0) {
printf("mac_biba_associate_vnode_extattr: invalid\n");
return (EPERM);
}
if ((temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_SINGLE) {
printf("mac_biba_associate_vnode_extattr: not single\n");
return (EPERM);
}
mac_biba_copy_single(&temp, dest);
return (0);
}
static void
mac_biba_associate_vnode_singlelabel(struct mount *mp,
struct label *fslabel, struct vnode *vp, struct label *vlabel)
{
struct mac_biba *source, *dest;
source = SLOT(fslabel);
dest = SLOT(vlabel);
mac_biba_copy_single(source, dest);
}
static int
mac_biba_create_vnode_extattr(struct ucred *cred, struct mount *mp,
struct label *fslabel, struct vnode *dvp, struct label *dlabel,
struct vnode *vp, struct label *vlabel, struct componentname *cnp)
{
struct mac_biba *source, *dest, temp;
size_t buflen;
int error;
buflen = sizeof(temp);
bzero(&temp, buflen);
source = SLOT(&cred->cr_label);
dest = SLOT(vlabel);
mac_biba_copy_single(source, &temp);
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread);
if (error == 0)
mac_biba_copy_single(source, dest);
return (error);
}
static int
mac_biba_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp,
struct label *vlabel, struct label *intlabel)
{
struct mac_biba *source, temp;
size_t buflen;
int error;
buflen = sizeof(temp);
bzero(&temp, buflen);
source = SLOT(intlabel);
if ((source->mb_flags & MAC_BIBA_FLAG_SINGLE) == 0)
return (0);
mac_biba_copy_single(source, &temp);
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread);
return (error);
}
/*
* 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);
}
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);
}
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(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(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, type;
dest = SLOT(ifnetlabel);
if (ifnet->if_type == IFT_LOOP) {
type = MAC_BIBA_TYPE_EQUAL;
goto set;
}
if (trust_all_interfaces) {
type = MAC_BIBA_TYPE_HIGH;
goto set;
}
type = MAC_BIBA_TYPE_LOW;
if (trusted_interfaces[0] == '\0' ||
!strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
goto set;
bzero(tiflist, sizeof(tiflist));
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) {
type = MAC_BIBA_TYPE_HIGH;
break;
}
} else {
*p = '\0';
printf("mac_biba warning: interface name "
"\"%s\" is too long (must be < %d)\n",
q, IFNAMSIZ);
}
if (*p == '\0')
break;
q = p + 1;
}
}
set:
mac_biba_set_single(dest, type, 0, NULL);
mac_biba_set_range(dest, type, 0, NULL, type, 0, NULL);
}
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);
/*
* Because the source mbuf may not yet have been "created",
* just initialized, we do a conditional copy. Since we don't
* allow mbufs to have ranges, do a KASSERT to make sure that
* doesn't happen.
*/
KASSERT((source->mb_flags & MAC_BIBA_FLAG_RANGE) == 0,
("mac_biba_create_mbuf_from_mbuf: source mbuf has range"));
mac_biba_copy(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, NULL);
}
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(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_create_proc0(struct ucred *cred)
{
struct mac_biba *dest;
dest = SLOT(&cred->cr_label);
mac_biba_set_single(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL,
MAC_BIBA_TYPE_HIGH, 0, NULL);
}
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, NULL);
mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL,
MAC_BIBA_TYPE_HIGH, 0, NULL);
}
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(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;
int error;
subj = SLOT(&cred->cr_label);
new = SLOT(newlabel);
/*
* If there is a Biba label update for the credential, it may
* be an update of the single, range, or both.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
if (error)
return (error);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) {
/*
* If the change request modifies both the Biba label
* single and range, check that the new single will be
* in the new range.
*/
if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
MAC_BIBA_FLAGS_BOTH &&
!mac_biba_single_in_range(new, new))
return (EINVAL);
/*
* To change the Biba single label on a credential, the
* new single label must be in the current range.
*/
if (new->mb_flags & MAC_BIBA_FLAG_SINGLE &&
!mac_biba_single_in_range(new, subj))
return (EPERM);
/*
* To change the Biba range on a credential, the new
* range label must be in the current range.
*/
if (new->mb_flags & MAC_BIBA_FLAG_RANGE &&
!mac_biba_range_in_range(new, subj))
return (EPERM);
/*
* To have EQUAL in any component of the new credential
* Biba label, the subject must already have EQUAL in
* their label.
*/
if (mac_biba_contains_equal(new)) {
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
}
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;
int error;
subj = SLOT(&cred->cr_label);
new = SLOT(newlabel);
/*
* If there is a Biba label update for the interface, it may
* be an update of the single, range, or both.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
if (error)
return (error);
/*
* Relabling network interfaces requires Biba privilege.
*/
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) {
/*
* Rely on the traditional superuser status for the Biba
* interface relabel requirements. XXXMAC: This will go
* away.
*/
error = suser_cred(cred, 0);
if (error)
return (EPERM);
/*
* XXXMAC: Additional consistency tests regarding the single
* and the range of the new label might be performed here.
*/
}
return (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_kld_load(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_biba *subj, *obj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
obj = SLOT(label);
if (!mac_biba_high_single(obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_kld_unload(struct ucred *cred)
{
struct mac_biba *subj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
return (mac_biba_subject_privileged(subj));
}
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_poll(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_read(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
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;
int error;
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
obj = SLOT(pipelabel);
/*
* If there is a Biba label update for a pipe, it must be a
* single update.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE);
if (error)
return (error);
/*
* To perform a relabel of a pipe (Biba label or not), Biba must
* authorize the relabel.
*/
if (!mac_biba_single_in_range(obj, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) {
/*
* To change the Biba label on a pipe, the new pipe label
* must be in the subject range.
*/
if (!mac_biba_single_in_range(new, subj))
return (EPERM);
/*
* To change the Biba label on a pipe to be EQUAL, the
* subject must have appropriate privilege.
*/
if (mac_biba_contains_equal(new)) {
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mac_biba_check_pipe_stat(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_write(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
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_deliver(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 *so,
struct label *socketlabel, struct label *newlabel)
{
struct mac_biba *subj, *obj, *new;
int error;
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
obj = SLOT(socketlabel);
/*
* If there is a Biba label update for the socket, it may be
* an update of single.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE);
if (error)
return (error);
/*
* To relabel a socket, the old socket single must be in the subject
* range.
*/
if (!mac_biba_single_in_range(obj, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) {
/*
* To relabel a socket, the new socket single must be in
* the subject range.
*/
if (!mac_biba_single_in_range(new, subj))
return (EPERM);
/*
* To change the Biba label on the socket to contain EQUAL,
* the subject must have appropriate privilege.
*/
if (mac_biba_contains_equal(new)) {
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mac_biba_check_socket_visible(struct ucred *cred, struct socket *socket,
struct label *socketlabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(socketlabel);
if (!mac_biba_dominate_single(obj, subj))
return (ENOENT);
return (0);
}
static int
mac_biba_check_sysarch_ioperm(struct ucred *cred)
{
struct mac_biba *subj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
return (0);
}
static int
mac_biba_check_system_acct(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_biba *subj, *obj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
if (label == NULL)
return (0);
obj = SLOT(label);
if (!mac_biba_high_single(obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_system_settime(struct ucred *cred)
{
struct mac_biba *subj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
return (0);
}
static int
mac_biba_check_system_swapon(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_biba *subj, *obj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
if (!mac_biba_high_single(obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_system_swapoff(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_biba *subj, *obj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
return (0);
}
static int
mac_biba_check_system_sysctl(struct ucred *cred, int *name, u_int namelen,
void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen)
{
struct mac_biba *subj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&cred->cr_label);
/*
* In general, treat sysctl variables as biba/high, but also
* require privilege to change them, since they are a
* communications channel between grades. Exempt MIB
* queries from this due to undocmented sysctl magic.
* XXXMAC: This probably requires some more review.
*/
if (new != NULL) {
if (namelen > 0 && name[0] == 0)
return (0);
if (!mac_biba_subject_dominate_high(subj))
return (EACCES);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
return (0);
}
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 image_params *imgp,
struct label *execlabel)
{
struct mac_biba *subj, *obj, *exec;
int error;
if (execlabel != NULL) {
/*
* We currently don't permit labels to be changed at
* exec-time as part of Biba, so disallow non-NULL
* Biba label elements in the execlabel.
*/
exec = SLOT(execlabel);
error = biba_atmostflags(exec, 0);
if (error)
return (error);
}
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_link(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_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_mmap(struct ucred *cred, struct vnode *vp,
struct label *label, int prot)
{
struct mac_biba *subj, *obj;
/*
* Rely on the use of open()-time protections to handle
* non-revocation cases.
*/
if (!mac_biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
}
if (prot & VM_PROT_WRITE) {
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, int 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_poll(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *label)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *label)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(obj, subj))
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;
int error;
old = SLOT(vnodelabel);
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
/*
* If there is a Biba label update for the vnode, it must be a
* single label.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_SINGLE);
if (error)
return (error);
/*
* To perform a relabel of the vnode (Biba label or not), Biba must
* authorize the relabel.
*/
if (!mac_biba_single_in_range(old, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_SINGLE) {
/*
* To change the Biba label on a vnode, the new vnode label
* must be in the subject range.
*/
if (!mac_biba_single_in_range(new, subj))
return (EPERM);
/*
* To change the Biba label on the vnode to be EQUAL,
* the subject must have appropriate privilege.
*/
if (mac_biba_contains_equal(new)) {
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (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 *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vnodelabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_biba_dominate_single(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_write(struct ucred *active_cred,
struct ucred *file_cred, struct vnode *vp, struct label *label)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_single(subj, obj))
return (EACCES);
return (0);
}
static struct mac_policy_ops mac_biba_ops =
{
.mpo_destroy = mac_biba_destroy,
.mpo_init = mac_biba_init,
.mpo_init_bpfdesc_label = mac_biba_init_label,
.mpo_init_cred_label = mac_biba_init_label,
.mpo_init_devfsdirent_label = mac_biba_init_label,
.mpo_init_ifnet_label = mac_biba_init_label,
.mpo_init_ipq_label = mac_biba_init_label_waitcheck,
.mpo_init_mbuf_label = mac_biba_init_label_waitcheck,
.mpo_init_mount_label = mac_biba_init_label,
.mpo_init_mount_fs_label = mac_biba_init_label,
.mpo_init_pipe_label = mac_biba_init_label,
.mpo_init_socket_label = mac_biba_init_label_waitcheck,
.mpo_init_socket_peer_label = mac_biba_init_label_waitcheck,
.mpo_init_vnode_label = mac_biba_init_label,
.mpo_destroy_bpfdesc_label = mac_biba_destroy_label,
.mpo_destroy_cred_label = mac_biba_destroy_label,
.mpo_destroy_devfsdirent_label = mac_biba_destroy_label,
.mpo_destroy_ifnet_label = mac_biba_destroy_label,
.mpo_destroy_ipq_label = mac_biba_destroy_label,
.mpo_destroy_mbuf_label = mac_biba_destroy_label,
.mpo_destroy_mount_label = mac_biba_destroy_label,
.mpo_destroy_mount_fs_label = mac_biba_destroy_label,
.mpo_destroy_pipe_label = mac_biba_destroy_label,
.mpo_destroy_socket_label = mac_biba_destroy_label,
.mpo_destroy_socket_peer_label = mac_biba_destroy_label,
.mpo_destroy_vnode_label = mac_biba_destroy_label,
.mpo_copy_mbuf_label = mac_biba_copy_label,
.mpo_copy_pipe_label = mac_biba_copy_label,
.mpo_copy_vnode_label = mac_biba_copy_label,
.mpo_externalize_cred_label = mac_biba_externalize_label,
.mpo_externalize_ifnet_label = mac_biba_externalize_label,
.mpo_externalize_pipe_label = mac_biba_externalize_label,
.mpo_externalize_socket_label = mac_biba_externalize_label,
.mpo_externalize_socket_peer_label = mac_biba_externalize_label,
.mpo_externalize_vnode_label = mac_biba_externalize_label,
.mpo_internalize_cred_label = mac_biba_internalize_label,
.mpo_internalize_ifnet_label = mac_biba_internalize_label,
.mpo_internalize_pipe_label = mac_biba_internalize_label,
.mpo_internalize_socket_label = mac_biba_internalize_label,
.mpo_internalize_vnode_label = mac_biba_internalize_label,
.mpo_create_devfs_device = mac_biba_create_devfs_device,
.mpo_create_devfs_directory = mac_biba_create_devfs_directory,
.mpo_create_devfs_symlink = mac_biba_create_devfs_symlink,
.mpo_create_mount = mac_biba_create_mount,
.mpo_create_root_mount = mac_biba_create_root_mount,
.mpo_relabel_vnode = mac_biba_relabel_vnode,
.mpo_update_devfsdirent = mac_biba_update_devfsdirent,
.mpo_associate_vnode_devfs = mac_biba_associate_vnode_devfs,
.mpo_associate_vnode_extattr = mac_biba_associate_vnode_extattr,
.mpo_associate_vnode_singlelabel = mac_biba_associate_vnode_singlelabel,
.mpo_create_vnode_extattr = mac_biba_create_vnode_extattr,
.mpo_setlabel_vnode_extattr = mac_biba_setlabel_vnode_extattr,
.mpo_create_mbuf_from_socket = mac_biba_create_mbuf_from_socket,
.mpo_create_pipe = mac_biba_create_pipe,
.mpo_create_socket = mac_biba_create_socket,
.mpo_create_socket_from_socket = mac_biba_create_socket_from_socket,
.mpo_relabel_pipe = mac_biba_relabel_pipe,
.mpo_relabel_socket = mac_biba_relabel_socket,
.mpo_set_socket_peer_from_mbuf = mac_biba_set_socket_peer_from_mbuf,
.mpo_set_socket_peer_from_socket = mac_biba_set_socket_peer_from_socket,
.mpo_create_bpfdesc = mac_biba_create_bpfdesc,
.mpo_create_datagram_from_ipq = mac_biba_create_datagram_from_ipq,
.mpo_create_fragment = mac_biba_create_fragment,
.mpo_create_ifnet = mac_biba_create_ifnet,
.mpo_create_ipq = mac_biba_create_ipq,
.mpo_create_mbuf_from_mbuf = mac_biba_create_mbuf_from_mbuf,
.mpo_create_mbuf_linklayer = mac_biba_create_mbuf_linklayer,
.mpo_create_mbuf_from_bpfdesc = mac_biba_create_mbuf_from_bpfdesc,
.mpo_create_mbuf_from_ifnet = mac_biba_create_mbuf_from_ifnet,
.mpo_create_mbuf_multicast_encap = mac_biba_create_mbuf_multicast_encap,
.mpo_create_mbuf_netlayer = mac_biba_create_mbuf_netlayer,
.mpo_fragment_match = mac_biba_fragment_match,
.mpo_relabel_ifnet = mac_biba_relabel_ifnet,
.mpo_update_ipq = mac_biba_update_ipq,
.mpo_create_cred = mac_biba_create_cred,
.mpo_create_proc0 = mac_biba_create_proc0,
.mpo_create_proc1 = mac_biba_create_proc1,
.mpo_relabel_cred = mac_biba_relabel_cred,
.mpo_check_bpfdesc_receive = mac_biba_check_bpfdesc_receive,
.mpo_check_cred_relabel = mac_biba_check_cred_relabel,
.mpo_check_cred_visible = mac_biba_check_cred_visible,
.mpo_check_ifnet_relabel = mac_biba_check_ifnet_relabel,
.mpo_check_ifnet_transmit = mac_biba_check_ifnet_transmit,
.mpo_check_kld_load = mac_biba_check_kld_load,
.mpo_check_kld_unload = mac_biba_check_kld_unload,
.mpo_check_mount_stat = mac_biba_check_mount_stat,
.mpo_check_pipe_ioctl = mac_biba_check_pipe_ioctl,
.mpo_check_pipe_poll = mac_biba_check_pipe_poll,
.mpo_check_pipe_read = mac_biba_check_pipe_read,
.mpo_check_pipe_relabel = mac_biba_check_pipe_relabel,
.mpo_check_pipe_stat = mac_biba_check_pipe_stat,
.mpo_check_pipe_write = mac_biba_check_pipe_write,
.mpo_check_proc_debug = mac_biba_check_proc_debug,
.mpo_check_proc_sched = mac_biba_check_proc_sched,
.mpo_check_proc_signal = mac_biba_check_proc_signal,
.mpo_check_socket_deliver = mac_biba_check_socket_deliver,
.mpo_check_socket_relabel = mac_biba_check_socket_relabel,
.mpo_check_socket_visible = mac_biba_check_socket_visible,
.mpo_check_sysarch_ioperm = mac_biba_check_sysarch_ioperm,
.mpo_check_system_acct = mac_biba_check_system_acct,
.mpo_check_system_settime = mac_biba_check_system_settime,
.mpo_check_system_swapon = mac_biba_check_system_swapon,
.mpo_check_system_swapoff = mac_biba_check_system_swapoff,
.mpo_check_system_sysctl = mac_biba_check_system_sysctl,
.mpo_check_vnode_access = mac_biba_check_vnode_open,
.mpo_check_vnode_chdir = mac_biba_check_vnode_chdir,
.mpo_check_vnode_chroot = mac_biba_check_vnode_chroot,
.mpo_check_vnode_create = mac_biba_check_vnode_create,
.mpo_check_vnode_delete = mac_biba_check_vnode_delete,
.mpo_check_vnode_deleteacl = mac_biba_check_vnode_deleteacl,
.mpo_check_vnode_exec = mac_biba_check_vnode_exec,
.mpo_check_vnode_getacl = mac_biba_check_vnode_getacl,
.mpo_check_vnode_getextattr = mac_biba_check_vnode_getextattr,
.mpo_check_vnode_link = mac_biba_check_vnode_link,
.mpo_check_vnode_lookup = mac_biba_check_vnode_lookup,
.mpo_check_vnode_mmap = mac_biba_check_vnode_mmap,
.mpo_check_vnode_mprotect = mac_biba_check_vnode_mmap,
.mpo_check_vnode_open = mac_biba_check_vnode_open,
.mpo_check_vnode_poll = mac_biba_check_vnode_poll,
.mpo_check_vnode_read = mac_biba_check_vnode_read,
.mpo_check_vnode_readdir = mac_biba_check_vnode_readdir,
.mpo_check_vnode_readlink = mac_biba_check_vnode_readlink,
.mpo_check_vnode_relabel = mac_biba_check_vnode_relabel,
.mpo_check_vnode_rename_from = mac_biba_check_vnode_rename_from,
.mpo_check_vnode_rename_to = mac_biba_check_vnode_rename_to,
.mpo_check_vnode_revoke = mac_biba_check_vnode_revoke,
.mpo_check_vnode_setacl = mac_biba_check_vnode_setacl,
.mpo_check_vnode_setextattr = mac_biba_check_vnode_setextattr,
.mpo_check_vnode_setflags = mac_biba_check_vnode_setflags,
.mpo_check_vnode_setmode = mac_biba_check_vnode_setmode,
.mpo_check_vnode_setowner = mac_biba_check_vnode_setowner,
.mpo_check_vnode_setutimes = mac_biba_check_vnode_setutimes,
.mpo_check_vnode_stat = mac_biba_check_vnode_stat,
.mpo_check_vnode_write = mac_biba_check_vnode_write,
};
MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba",
MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &mac_biba_slot);
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