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freebsd-nq/sys/security/mac_biba/mac_biba.c
Christian S.J. Peron d94f2a68f8 Introduce a new entry point, mac_create_mbuf_from_firewall. This entry point 
exists to allow the mandatory access control policy to properly initialize
mbufs generated by the firewall. An example where this might happen is keep
alive packets, or ICMP error packets in response to other packets.

This takes care of kernel panics associated with un-initialize mbuf labels
when the firewall generates packets.

[1] I modified this patch from it's original version, the initial patch
    introduced a number of entry points which were programmatically
    equivalent. So I introduced only one. Instead, we should leverage
    mac_create_mbuf_netlayer() which is used for similar situations,
    an example being icmp_error()

    This will minimize the impact associated with the MFC

Submitted by:	mlaier [1]
MFC after:	1 week

This is a RELENG_6 candidate
2006-09-12 04:25:13 +00:00

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/*-
* Copyright (c) 1999-2002 Robert N. M. Watson
* Copyright (c) 2001-2005 McAfee, 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 McAfee
* Research, the Security Research Division of McAfee, 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/mman.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/sx.h>
#include <sys/sysctl.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <posix4/ksem.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/in_pcb.h>
#include <netinet/ip_var.h>
#include <vm/uma.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 interfaces_equal;
SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RW,
&interfaces_equal, 0, "Label network interfaces as biba/equal on create");
TUNABLE_INT("security.mac.biba.interfaces_equal", &interfaces_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)
#define SLOT_SET(l, val) (LABEL_TO_SLOT((l), mac_biba_slot).l_ptr = (val))
static uma_zone_t zone_biba;
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)
{
return (uma_zalloc(zone_biba, flag | M_ZERO));
}
static void
biba_free(struct mac_biba *mac_biba)
{
if (mac_biba != NULL)
uma_zfree(zone_biba, mac_biba);
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_EFFECTIVE) != 0,
("mac_biba_effective_in_range: mac_biba not effective"));
element = &mac_biba->mb_effective;
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_effective_in_range(struct mac_biba *effective,
struct mac_biba *range)
{
KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_effective_in_range: a not effective"));
KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
("mac_biba_effective_in_range: b not range"));
return (mac_biba_dominate_element(&range->mb_rangehigh,
&effective->mb_effective) &&
mac_biba_dominate_element(&effective->mb_effective,
&range->mb_rangelow));
return (1);
}
static int
mac_biba_dominate_effective(struct mac_biba *a, struct mac_biba *b)
{
KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_dominate_effective: a not effective"));
KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_dominate_effective: b not effective"));
return (mac_biba_dominate_element(&a->mb_effective, &b->mb_effective));
}
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_effective(struct mac_biba *a, struct mac_biba *b)
{
KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_equal_effective: a not effective"));
KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_equal_effective: b not effective"));
return (mac_biba_equal_element(&a->mb_effective, &b->mb_effective));
}
static int
mac_biba_contains_equal(struct mac_biba *mac_biba)
{
if (mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE)
if (mac_biba->mb_effective.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 effective is EQUAL, it's ok. */
if (mac_biba->mb_effective.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_effective(struct mac_biba *mac_biba)
{
KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_equal_effective: mac_biba not effective"));
return (mac_biba->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH);
}
static int
mac_biba_valid(struct mac_biba *mac_biba)
{
if (mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
switch (mac_biba->mb_effective.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_effective.mbe_grade != 0 ||
!MAC_BIBA_BIT_SET_EMPTY(
mac_biba->mb_effective.mbe_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
} else {
if (mac_biba->mb_effective.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_effective(struct mac_biba *mac_biba, u_short type, u_short grade,
u_char *compartments)
{
mac_biba->mb_effective.mbe_type = type;
mac_biba->mb_effective.mbe_grade = grade;
if (compartments != NULL)
memcpy(mac_biba->mb_effective.mbe_compartments, compartments,
sizeof(mac_biba->mb_effective.mbe_compartments));
mac_biba->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
}
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_effective(struct mac_biba *labelfrom, struct mac_biba *labelto)
{
KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_copy_effective: labelfrom not effective"));
labelto->mb_effective = labelfrom->mb_effective;
labelto->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
}
static void
mac_biba_copy(struct mac_biba *source, struct mac_biba *dest)
{
if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE)
mac_biba_copy_effective(source, dest);
if (source->mb_flags & MAC_BIBA_FLAG_RANGE)
mac_biba_copy_range(source, dest);
}
/*
* Policy module operations.
*/
static void
mac_biba_init(struct mac_policy_conf *conf)
{
zone_biba = uma_zcreate("mac_biba", sizeof(struct mac_biba), NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
}
/*
* Label operations.
*/
static void
mac_biba_init_label(struct label *label)
{
SLOT_SET(label, biba_alloc(M_WAITOK));
}
static int
mac_biba_init_label_waitcheck(struct label *label, int flag)
{
SLOT_SET(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_SET(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_EFFECTIVE) {
if (mac_biba_element_to_string(sb, &mac_biba->mb_effective)
== -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, *effective;
int error;
effective = strsep(&string, "(");
if (*effective == '\0')
effective = 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 (effective != NULL) {
error = mac_biba_parse_element(&mac_biba->mb_effective, effective);
if (error)
return (error);
mac_biba->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
}
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 ucred *cred, struct mount *mp,
struct cdev *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_effective(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_effective(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_effective(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_effective(source, dest);
dest = SLOT(fslabel);
mac_biba_copy_effective(source, dest);
}
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_effective(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_effective(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_EFFECTIVE) {
printf("mac_biba_associate_vnode_extattr: not effective\n");
return (EPERM);
}
mac_biba_copy_effective(&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_effective(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_effective(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_effective(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_EFFECTIVE) == 0)
return (0);
mac_biba_copy_effective(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_inpcb_from_socket(struct socket *so, struct label *solabel,
struct inpcb *inp, struct label *inplabel)
{
struct mac_biba *source, *dest;
source = SLOT(solabel);
dest = SLOT(inplabel);
mac_biba_copy_effective(source, dest);
}
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_effective(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_effective(source, dest);
}
static void
mac_biba_create_pipe(struct ucred *cred, struct pipepair *pp,
struct label *pipelabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(pipelabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_posix_sem(struct ucred *cred, struct ksem *ksemptr,
struct label *ks_label)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(ks_label);
mac_biba_copy_effective(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_effective(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 pipepair *pp,
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_effective(source, dest);
}
/*
* Labeling event operations: System V IPC objects.
*/
static void
mac_biba_create_sysv_msgmsg(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
{
struct mac_biba *source, *dest;
/* Ignore the msgq label */
source = SLOT(cred->cr_label);
dest = SLOT(msglabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_sysv_msgqueue(struct ucred *cred,
struct msqid_kernel *msqkptr, struct label *msqlabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(msqlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_sysv_sem(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semalabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(semalabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_sysv_shm(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmlabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(shmlabel);
mac_biba_copy_effective(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_effective(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_effective(source, dest);
}
static void
mac_biba_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel)
{
char tifname[IFNAMSIZ], *p, *q;
char tiflist[sizeof(trusted_interfaces)];
struct mac_biba *dest;
int len, type;
dest = SLOT(ifnetlabel);
if (ifnet->if_type == IFT_LOOP || interfaces_equal != 0) {
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;
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, ifnet->if_xname) == 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_effective(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_effective(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_effective(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_effective(source, dest);
}
static void
mac_biba_create_mbuf_from_inpcb(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(inplabel);
dest = SLOT(mlabel);
mac_biba_copy_effective(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_effective(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_effective(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_effective(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_effective(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_effective(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_effective(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 */
}
static void
mac_biba_inpcb_sosetlabel(struct socket *so, struct label *solabel,
struct inpcb *inp, struct label *inplabel)
{
struct mac_biba *source, *dest;
source = SLOT(solabel);
dest = SLOT(inplabel);
mac_biba_copy(source, dest);
}
static void
mac_biba_create_mbuf_from_firewall(struct mbuf *m, struct label *label)
{
struct mac_biba *dest;
dest = SLOT(label);
/* XXX: where is the label for the firewall really comming from? */
mac_biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
}
/*
* Labeling event operations: processes.
*/
static void
mac_biba_create_proc0(struct ucred *cred)
{
struct mac_biba *dest;
dest = SLOT(cred->cr_label);
mac_biba_set_effective(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_effective(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);
}
/*
* Label cleanup/flush operations
*/
static void
mac_biba_cleanup_sysv_msgmsg(struct label *msglabel)
{
bzero(SLOT(msglabel), sizeof(struct mac_biba));
}
static void
mac_biba_cleanup_sysv_msgqueue(struct label *msqlabel)
{
bzero(SLOT(msqlabel), sizeof(struct mac_biba));
}
static void
mac_biba_cleanup_sysv_sem(struct label *semalabel)
{
bzero(SLOT(semalabel), sizeof(struct mac_biba));
}
static void
mac_biba_cleanup_sysv_shm(struct label *shmlabel)
{
bzero(SLOT(shmlabel), sizeof(struct mac_biba));
}
/*
* 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_effective(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 effective, 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
* effective and range, check that the new effective will be
* in the new range.
*/
if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
MAC_BIBA_FLAGS_BOTH &&
!mac_biba_effective_in_range(new, new))
return (EINVAL);
/*
* To change the Biba effective label on a credential, the
* new effective label must be in the current range.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE &&
!mac_biba_effective_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_effective(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 effective, 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);
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_effective_in_range(p, i) ? 0 : EACCES);
}
static int
mac_biba_check_inpcb_deliver(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *p, *i;
if (!mac_biba_enabled)
return (0);
p = SLOT(mlabel);
i = SLOT(inplabel);
return (mac_biba_equal_effective(p, i) ? 0 : EACCES);
}
static int
mac_biba_check_sysv_msgrcv(struct ucred *cred, struct msg *msgptr,
struct label *msglabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msglabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msgrmid(struct ucred *cred, struct msg *msgptr,
struct label *msglabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msglabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel, int cmd)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
break;
case IPC_STAT:
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
mac_biba_check_sysv_semctl(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel, int cmd)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
case SETVAL:
case SETALL:
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
break;
case IPC_STAT:
case GETVAL:
case GETPID:
case GETNCNT:
case GETZCNT:
case GETALL:
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
mac_biba_check_sysv_semget(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_semop(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel, size_t accesstype)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
if (accesstype & SEM_R)
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
if (accesstype & SEM_A)
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int shmflg)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
if ((shmflg & SHM_RDONLY) == 0) {
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_biba_check_sysv_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int cmd)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
break;
case IPC_STAT:
case SHM_STAT:
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
mac_biba_check_sysv_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int shmflg)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
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_effective(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_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_ioctl(struct ucred *cred, struct pipepair *pp,
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 pipepair *pp,
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_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_read(struct ucred *cred, struct pipepair *pp,
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_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_relabel(struct ucred *cred, struct pipepair *pp,
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
* effective update.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To perform a relabel of a pipe (Biba label or not), Biba must
* authorize the relabel.
*/
if (!mac_biba_effective_in_range(obj, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
/*
* To change the Biba label on a pipe, the new pipe label
* must be in the subject range.
*/
if (!mac_biba_effective_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 pipepair *pp,
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_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_write(struct ucred *cred, struct pipepair *pp,
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_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_posix_sem_write(struct ucred *cred, struct ksem *ksemptr,
struct label *ks_label)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(ks_label);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_posix_sem_rdonly(struct ucred *cred, struct ksem *ksemptr,
struct label *ks_label)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(ks_label);
if (!mac_biba_dominate_effective(obj, subj))
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_effective(obj, subj))
return (ESRCH);
if (!mac_biba_dominate_effective(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_effective(obj, subj))
return (ESRCH);
if (!mac_biba_dominate_effective(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_effective(obj, subj))
return (ESRCH);
if (!mac_biba_dominate_effective(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_effective(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 effective.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To relabel a socket, the old socket effective must be in the subject
* range.
*/
if (!mac_biba_effective_in_range(obj, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
/*
* To relabel a socket, the new socket effective must be in
* the subject range.
*/
if (!mac_biba_effective_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_effective(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_effective(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_effective(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, struct sysctl_oid *oidp,
void *arg1, int arg2, struct sysctl_req *req)
{
struct mac_biba *subj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
/*
* Treat sysctl variables without CTLFLAG_ANYBODY flag as
* biba/high, but also require privilege to change them.
*/
if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 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_effective(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_effective(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_effective(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_effective(subj, obj))
return (EACCES);
obj = SLOT(label);
if (!mac_biba_dominate_effective(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_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp,
struct label *label, int attrnamespace, const char *name)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_effective(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_effective(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_effective(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_effective(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_effective(subj, obj))
return (EACCES);
obj = SLOT(label);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_listextattr(struct ucred *cred, struct vnode *vp,
struct label *label, int attrnamespace)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(label);
if (!mac_biba_dominate_effective(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_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_mmap(struct ucred *cred, struct vnode *vp,
struct label *label, int prot, int flags)
{
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_effective(obj, subj))
return (EACCES);
}
if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
if (!mac_biba_dominate_effective(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_effective(obj, subj))
return (EACCES);
}
if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
if (!mac_biba_dominate_effective(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_effective(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_effective(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_effective(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_effective(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
* effective label.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To perform a relabel of the vnode (Biba label or not), Biba must
* authorize the relabel.
*/
if (!mac_biba_effective_in_range(old, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
/*
* To change the Biba label on a vnode, the new vnode label
* must be in the subject range.
*/
if (!mac_biba_effective_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_effective(subj, obj))
return (EACCES);
obj = SLOT(label);
if (!mac_biba_dominate_effective(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_effective(subj, obj))
return (EACCES);
if (vp != NULL) {
obj = SLOT(label);
if (!mac_biba_dominate_effective(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_effective(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_effective(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_effective(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_effective(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_effective(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_effective(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_effective(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_effective(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_effective(subj, obj))
return (EACCES);
return (0);
}
static void
mac_biba_associate_nfsd_label(struct ucred *cred)
{
struct mac_biba *label;
label = SLOT(cred->cr_label);
mac_biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL);
mac_biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL,
MAC_BIBA_TYPE_HIGH, 0, NULL);
}
static struct mac_policy_ops mac_biba_ops =
{
.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_inpcb_label = mac_biba_init_label_waitcheck,
.mpo_init_sysv_msgmsg_label = mac_biba_init_label,
.mpo_init_sysv_msgqueue_label = mac_biba_init_label,
.mpo_init_sysv_sem_label = mac_biba_init_label,
.mpo_init_sysv_shm_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_posix_sem_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_inpcb_label = mac_biba_destroy_label,
.mpo_destroy_sysv_msgmsg_label = mac_biba_destroy_label,
.mpo_destroy_sysv_msgqueue_label = mac_biba_destroy_label,
.mpo_destroy_sysv_sem_label = mac_biba_destroy_label,
.mpo_destroy_sysv_shm_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_posix_sem_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_cred_label = mac_biba_copy_label,
.mpo_copy_ifnet_label = mac_biba_copy_label,
.mpo_copy_mbuf_label = mac_biba_copy_label,
.mpo_copy_pipe_label = mac_biba_copy_label,
.mpo_copy_socket_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_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_posix_sem = mac_biba_create_posix_sem,
.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_inpcb_from_socket = mac_biba_create_inpcb_from_socket,
.mpo_create_sysv_msgmsg = mac_biba_create_sysv_msgmsg,
.mpo_create_sysv_msgqueue = mac_biba_create_sysv_msgqueue,
.mpo_create_sysv_sem = mac_biba_create_sysv_sem,
.mpo_create_sysv_shm = mac_biba_create_sysv_shm,
.mpo_create_ipq = mac_biba_create_ipq,
.mpo_create_mbuf_from_inpcb = mac_biba_create_mbuf_from_inpcb,
.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_inpcb_sosetlabel = mac_biba_inpcb_sosetlabel,
.mpo_create_proc0 = mac_biba_create_proc0,
.mpo_create_proc1 = mac_biba_create_proc1,
.mpo_relabel_cred = mac_biba_relabel_cred,
.mpo_cleanup_sysv_msgmsg = mac_biba_cleanup_sysv_msgmsg,
.mpo_cleanup_sysv_msgqueue = mac_biba_cleanup_sysv_msgqueue,
.mpo_cleanup_sysv_sem = mac_biba_cleanup_sysv_sem,
.mpo_cleanup_sysv_shm = mac_biba_cleanup_sysv_shm,
.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_inpcb_deliver = mac_biba_check_inpcb_deliver,
.mpo_check_sysv_msgrcv = mac_biba_check_sysv_msgrcv,
.mpo_check_sysv_msgrmid = mac_biba_check_sysv_msgrmid,
.mpo_check_sysv_msqget = mac_biba_check_sysv_msqget,
.mpo_check_sysv_msqsnd = mac_biba_check_sysv_msqsnd,
.mpo_check_sysv_msqrcv = mac_biba_check_sysv_msqrcv,
.mpo_check_sysv_msqctl = mac_biba_check_sysv_msqctl,
.mpo_check_sysv_semctl = mac_biba_check_sysv_semctl,
.mpo_check_sysv_semget = mac_biba_check_sysv_semget,
.mpo_check_sysv_semop = mac_biba_check_sysv_semop,
.mpo_check_sysv_shmat = mac_biba_check_sysv_shmat,
.mpo_check_sysv_shmctl = mac_biba_check_sysv_shmctl,
.mpo_check_sysv_shmget = mac_biba_check_sysv_shmget,
.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_posix_sem_destroy = mac_biba_check_posix_sem_write,
.mpo_check_posix_sem_getvalue = mac_biba_check_posix_sem_rdonly,
.mpo_check_posix_sem_open = mac_biba_check_posix_sem_write,
.mpo_check_posix_sem_post = mac_biba_check_posix_sem_write,
.mpo_check_posix_sem_unlink = mac_biba_check_posix_sem_write,
.mpo_check_posix_sem_wait = mac_biba_check_posix_sem_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_deleteextattr = mac_biba_check_vnode_deleteextattr,
.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_listextattr = mac_biba_check_vnode_listextattr,
.mpo_check_vnode_lookup = mac_biba_check_vnode_lookup,
.mpo_check_vnode_mmap = 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,
.mpo_associate_nfsd_label = mac_biba_associate_nfsd_label,
.mpo_create_mbuf_from_firewall = mac_biba_create_mbuf_from_firewall,
};
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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