2505 lines
58 KiB
C
2505 lines
58 KiB
C
/*-
|
|
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
|
|
* Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed by Robert Watson for the TrustedBSD Project.
|
|
*
|
|
* This software was developed for the FreeBSD Project in part by 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.
|
|
* MLS fixed label mandatory confidentiality 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/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_mls/mac_mls.h>
|
|
|
|
SYSCTL_DECL(_security_mac);
|
|
|
|
SYSCTL_NODE(_security_mac, OID_AUTO, mls, CTLFLAG_RW, 0,
|
|
"TrustedBSD mac_mls policy controls");
|
|
|
|
static int mac_mls_label_size = sizeof(struct mac_mls);
|
|
SYSCTL_INT(_security_mac_mls, OID_AUTO, label_size, CTLFLAG_RD,
|
|
&mac_mls_label_size, 0, "Size of struct mac_mls");
|
|
|
|
static int mac_mls_enabled = 0;
|
|
SYSCTL_INT(_security_mac_mls, OID_AUTO, enabled, CTLFLAG_RW,
|
|
&mac_mls_enabled, 0, "Enforce MAC/MLS policy");
|
|
TUNABLE_INT("security.mac.mls.enabled", &mac_mls_enabled);
|
|
|
|
static int destroyed_not_inited;
|
|
SYSCTL_INT(_security_mac_mls, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
|
|
&destroyed_not_inited, 0, "Count of labels destroyed but not inited");
|
|
|
|
static int ptys_equal = 0;
|
|
SYSCTL_INT(_security_mac_mls, OID_AUTO, ptys_equal, CTLFLAG_RW,
|
|
&ptys_equal, 0, "Label pty devices as mls/equal on create");
|
|
TUNABLE_INT("security.mac.mls.ptys_equal", &ptys_equal);
|
|
|
|
static int revocation_enabled = 0;
|
|
SYSCTL_INT(_security_mac_mls, OID_AUTO, revocation_enabled, CTLFLAG_RW,
|
|
&revocation_enabled, 0, "Revoke access to objects on relabel");
|
|
TUNABLE_INT("security.mac.mls.revocation_enabled", &revocation_enabled);
|
|
|
|
static int max_compartments = MAC_MLS_MAX_COMPARTMENTS;
|
|
SYSCTL_INT(_security_mac_mls, OID_AUTO, max_compartments, CTLFLAG_RD,
|
|
&max_compartments, 0, "Maximum compartments the policy supports");
|
|
|
|
static int mac_mls_slot;
|
|
#define SLOT(l) ((struct mac_mls *)LABEL_TO_SLOT((l), mac_mls_slot).l_ptr)
|
|
|
|
MALLOC_DEFINE(M_MACMLS, "mls label", "MAC/MLS labels");
|
|
|
|
static __inline int
|
|
mls_bit_set_empty(u_char *set) {
|
|
int i;
|
|
|
|
for (i = 0; i < MAC_MLS_MAX_COMPARTMENTS >> 3; i++)
|
|
if (set[i] != 0)
|
|
return (0);
|
|
return (1);
|
|
}
|
|
|
|
static struct mac_mls *
|
|
mls_alloc(int flag)
|
|
{
|
|
struct mac_mls *mac_mls;
|
|
|
|
mac_mls = malloc(sizeof(struct mac_mls), M_MACMLS, M_ZERO | flag);
|
|
|
|
return (mac_mls);
|
|
}
|
|
|
|
static void
|
|
mls_free(struct mac_mls *mac_mls)
|
|
{
|
|
|
|
if (mac_mls != NULL)
|
|
free(mac_mls, M_MACMLS);
|
|
else
|
|
atomic_add_int(&destroyed_not_inited, 1);
|
|
}
|
|
|
|
static int
|
|
mls_atmostflags(struct mac_mls *mac_mls, int flags)
|
|
{
|
|
|
|
if ((mac_mls->mm_flags & flags) != mac_mls->mm_flags)
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_dominate_element(struct mac_mls_element *a,
|
|
struct mac_mls_element *b)
|
|
{
|
|
int bit;
|
|
|
|
switch (a->mme_type) {
|
|
case MAC_MLS_TYPE_EQUAL:
|
|
case MAC_MLS_TYPE_HIGH:
|
|
return (1);
|
|
|
|
case MAC_MLS_TYPE_LOW:
|
|
switch (b->mme_type) {
|
|
case MAC_MLS_TYPE_LEVEL:
|
|
case MAC_MLS_TYPE_HIGH:
|
|
return (0);
|
|
|
|
case MAC_MLS_TYPE_EQUAL:
|
|
case MAC_MLS_TYPE_LOW:
|
|
return (1);
|
|
|
|
default:
|
|
panic("mac_mls_dominate_element: b->mme_type invalid");
|
|
}
|
|
|
|
case MAC_MLS_TYPE_LEVEL:
|
|
switch (b->mme_type) {
|
|
case MAC_MLS_TYPE_EQUAL:
|
|
case MAC_MLS_TYPE_LOW:
|
|
return (1);
|
|
|
|
case MAC_MLS_TYPE_HIGH:
|
|
return (0);
|
|
|
|
case MAC_MLS_TYPE_LEVEL:
|
|
for (bit = 1; bit <= MAC_MLS_MAX_COMPARTMENTS; bit++)
|
|
if (!MAC_MLS_BIT_TEST(bit,
|
|
a->mme_compartments) &&
|
|
MAC_MLS_BIT_TEST(bit, b->mme_compartments))
|
|
return (0);
|
|
return (a->mme_level >= b->mme_level);
|
|
|
|
default:
|
|
panic("mac_mls_dominate_element: b->mme_type invalid");
|
|
}
|
|
|
|
default:
|
|
panic("mac_mls_dominate_element: a->mme_type invalid");
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_range_in_range(struct mac_mls *rangea, struct mac_mls *rangeb)
|
|
{
|
|
|
|
return (mac_mls_dominate_element(&rangeb->mm_rangehigh,
|
|
&rangea->mm_rangehigh) &&
|
|
mac_mls_dominate_element(&rangea->mm_rangelow,
|
|
&rangeb->mm_rangelow));
|
|
}
|
|
|
|
static int
|
|
mac_mls_single_in_range(struct mac_mls *single, struct mac_mls *range)
|
|
{
|
|
|
|
KASSERT((single->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
|
|
("mac_mls_single_in_range: a not single"));
|
|
KASSERT((range->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
|
|
("mac_mls_single_in_range: b not range"));
|
|
|
|
return (mac_mls_dominate_element(&range->mm_rangehigh,
|
|
&single->mm_single) &&
|
|
mac_mls_dominate_element(&single->mm_single,
|
|
&range->mm_rangelow));
|
|
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
mac_mls_dominate_single(struct mac_mls *a, struct mac_mls *b)
|
|
{
|
|
KASSERT((a->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
|
|
("mac_mls_dominate_single: a not single"));
|
|
KASSERT((b->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
|
|
("mac_mls_dominate_single: b not single"));
|
|
|
|
return (mac_mls_dominate_element(&a->mm_single, &b->mm_single));
|
|
}
|
|
|
|
static int
|
|
mac_mls_equal_element(struct mac_mls_element *a, struct mac_mls_element *b)
|
|
{
|
|
|
|
if (a->mme_type == MAC_MLS_TYPE_EQUAL ||
|
|
b->mme_type == MAC_MLS_TYPE_EQUAL)
|
|
return (1);
|
|
|
|
return (a->mme_type == b->mme_type && a->mme_level == b->mme_level);
|
|
}
|
|
|
|
static int
|
|
mac_mls_equal_single(struct mac_mls *a, struct mac_mls *b)
|
|
{
|
|
|
|
KASSERT((a->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
|
|
("mac_mls_equal_single: a not single"));
|
|
KASSERT((b->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
|
|
("mac_mls_equal_single: b not single"));
|
|
|
|
return (mac_mls_equal_element(&a->mm_single, &b->mm_single));
|
|
}
|
|
|
|
static int
|
|
mac_mls_contains_equal(struct mac_mls *mac_mls)
|
|
{
|
|
|
|
if (mac_mls->mm_flags & MAC_MLS_FLAG_SINGLE)
|
|
if (mac_mls->mm_single.mme_type == MAC_MLS_TYPE_EQUAL)
|
|
return (1);
|
|
|
|
if (mac_mls->mm_flags & MAC_MLS_FLAG_RANGE) {
|
|
if (mac_mls->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL)
|
|
return (1);
|
|
if (mac_mls->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL)
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_subject_equal_ok(struct mac_mls *mac_mls)
|
|
{
|
|
|
|
KASSERT((mac_mls->mm_flags & MAC_MLS_FLAGS_BOTH) == MAC_MLS_FLAGS_BOTH,
|
|
("mac_mls_subject_equal_ok: subject doesn't have both labels"));
|
|
|
|
/* If the single is EQUAL, it's ok. */
|
|
if (mac_mls->mm_single.mme_type == MAC_MLS_TYPE_EQUAL)
|
|
return (0);
|
|
|
|
/* If either range endpoint is EQUAL, it's ok. */
|
|
if (mac_mls->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL ||
|
|
mac_mls->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL)
|
|
return (0);
|
|
|
|
/* If the range is low-high, it's ok. */
|
|
if (mac_mls->mm_rangelow.mme_type == MAC_MLS_TYPE_LOW &&
|
|
mac_mls->mm_rangehigh.mme_type == MAC_MLS_TYPE_HIGH)
|
|
return (0);
|
|
|
|
/* It's not ok. */
|
|
return (EPERM);
|
|
}
|
|
|
|
static int
|
|
mac_mls_valid(struct mac_mls *mac_mls)
|
|
{
|
|
|
|
if (mac_mls->mm_flags & MAC_MLS_FLAG_SINGLE) {
|
|
switch (mac_mls->mm_single.mme_type) {
|
|
case MAC_MLS_TYPE_LEVEL:
|
|
break;
|
|
|
|
case MAC_MLS_TYPE_EQUAL:
|
|
case MAC_MLS_TYPE_HIGH:
|
|
case MAC_MLS_TYPE_LOW:
|
|
if (mac_mls->mm_single.mme_level != 0 ||
|
|
!MAC_MLS_BIT_SET_EMPTY(
|
|
mac_mls->mm_single.mme_compartments))
|
|
return (EINVAL);
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
} else {
|
|
if (mac_mls->mm_single.mme_type != MAC_MLS_TYPE_UNDEF)
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (mac_mls->mm_flags & MAC_MLS_FLAG_RANGE) {
|
|
switch (mac_mls->mm_rangelow.mme_type) {
|
|
case MAC_MLS_TYPE_LEVEL:
|
|
break;
|
|
|
|
case MAC_MLS_TYPE_EQUAL:
|
|
case MAC_MLS_TYPE_HIGH:
|
|
case MAC_MLS_TYPE_LOW:
|
|
if (mac_mls->mm_rangelow.mme_level != 0 ||
|
|
!MAC_MLS_BIT_SET_EMPTY(
|
|
mac_mls->mm_rangelow.mme_compartments))
|
|
return (EINVAL);
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
|
|
switch (mac_mls->mm_rangehigh.mme_type) {
|
|
case MAC_MLS_TYPE_LEVEL:
|
|
break;
|
|
|
|
case MAC_MLS_TYPE_EQUAL:
|
|
case MAC_MLS_TYPE_HIGH:
|
|
case MAC_MLS_TYPE_LOW:
|
|
if (mac_mls->mm_rangehigh.mme_level != 0 ||
|
|
!MAC_MLS_BIT_SET_EMPTY(
|
|
mac_mls->mm_rangehigh.mme_compartments))
|
|
return (EINVAL);
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
if (!mac_mls_dominate_element(&mac_mls->mm_rangehigh,
|
|
&mac_mls->mm_rangelow))
|
|
return (EINVAL);
|
|
} else {
|
|
if (mac_mls->mm_rangelow.mme_type != MAC_MLS_TYPE_UNDEF ||
|
|
mac_mls->mm_rangehigh.mme_type != MAC_MLS_TYPE_UNDEF)
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_mls_set_range(struct mac_mls *mac_mls, u_short typelow,
|
|
u_short levellow, u_char *compartmentslow, u_short typehigh,
|
|
u_short levelhigh, u_char *compartmentshigh)
|
|
{
|
|
|
|
mac_mls->mm_rangelow.mme_type = typelow;
|
|
mac_mls->mm_rangelow.mme_level = levellow;
|
|
if (compartmentslow != NULL)
|
|
memcpy(mac_mls->mm_rangelow.mme_compartments,
|
|
compartmentslow,
|
|
sizeof(mac_mls->mm_rangelow.mme_compartments));
|
|
mac_mls->mm_rangehigh.mme_type = typehigh;
|
|
mac_mls->mm_rangehigh.mme_level = levelhigh;
|
|
if (compartmentshigh != NULL)
|
|
memcpy(mac_mls->mm_rangehigh.mme_compartments,
|
|
compartmentshigh,
|
|
sizeof(mac_mls->mm_rangehigh.mme_compartments));
|
|
mac_mls->mm_flags |= MAC_MLS_FLAG_RANGE;
|
|
}
|
|
|
|
static void
|
|
mac_mls_set_single(struct mac_mls *mac_mls, u_short type, u_short level,
|
|
u_char *compartments)
|
|
{
|
|
|
|
mac_mls->mm_single.mme_type = type;
|
|
mac_mls->mm_single.mme_level = level;
|
|
if (compartments != NULL)
|
|
memcpy(mac_mls->mm_single.mme_compartments, compartments,
|
|
sizeof(mac_mls->mm_single.mme_compartments));
|
|
mac_mls->mm_flags |= MAC_MLS_FLAG_SINGLE;
|
|
}
|
|
|
|
static void
|
|
mac_mls_copy_range(struct mac_mls *labelfrom, struct mac_mls *labelto)
|
|
{
|
|
|
|
KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
|
|
("mac_mls_copy_range: labelfrom not range"));
|
|
|
|
labelto->mm_rangelow = labelfrom->mm_rangelow;
|
|
labelto->mm_rangehigh = labelfrom->mm_rangehigh;
|
|
labelto->mm_flags |= MAC_MLS_FLAG_RANGE;
|
|
}
|
|
|
|
static void
|
|
mac_mls_copy_single(struct mac_mls *labelfrom, struct mac_mls *labelto)
|
|
{
|
|
|
|
KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_SINGLE) != 0,
|
|
("mac_mls_copy_single: labelfrom not single"));
|
|
|
|
labelto->mm_single = labelfrom->mm_single;
|
|
labelto->mm_flags |= MAC_MLS_FLAG_SINGLE;
|
|
}
|
|
|
|
static void
|
|
mac_mls_copy(struct mac_mls *source, struct mac_mls *dest)
|
|
{
|
|
|
|
if (source->mm_flags & MAC_MLS_FLAG_SINGLE)
|
|
mac_mls_copy_single(source, dest);
|
|
if (source->mm_flags & MAC_MLS_FLAG_RANGE)
|
|
mac_mls_copy_range(source, dest);
|
|
}
|
|
|
|
/*
|
|
* Policy module operations.
|
|
*/
|
|
static void
|
|
mac_mls_destroy(struct mac_policy_conf *conf)
|
|
{
|
|
|
|
}
|
|
|
|
static void
|
|
mac_mls_init(struct mac_policy_conf *conf)
|
|
{
|
|
|
|
}
|
|
|
|
/*
|
|
* Label operations.
|
|
*/
|
|
static void
|
|
mac_mls_init_label(struct label *label)
|
|
{
|
|
|
|
SLOT(label) = mls_alloc(M_WAITOK);
|
|
}
|
|
|
|
static int
|
|
mac_mls_init_label_waitcheck(struct label *label, int flag)
|
|
{
|
|
|
|
SLOT(label) = mls_alloc(flag);
|
|
if (SLOT(label) == NULL)
|
|
return (ENOMEM);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_mls_destroy_label(struct label *label)
|
|
{
|
|
|
|
mls_free(SLOT(label));
|
|
SLOT(label) = NULL;
|
|
}
|
|
|
|
/*
|
|
* mac_mls_element_to_string() is basically an snprintf wrapper with
|
|
* the same properties as snprintf(). It returns the length it would
|
|
* have added to the string in the event the string is too short.
|
|
*/
|
|
static size_t
|
|
mac_mls_element_to_string(char *string, size_t size,
|
|
struct mac_mls_element *element)
|
|
{
|
|
int pos, bit = 1;
|
|
|
|
switch (element->mme_type) {
|
|
case MAC_MLS_TYPE_HIGH:
|
|
return (snprintf(string, size, "high"));
|
|
|
|
case MAC_MLS_TYPE_LOW:
|
|
return (snprintf(string, size, "low"));
|
|
|
|
case MAC_MLS_TYPE_EQUAL:
|
|
return (snprintf(string, size, "equal"));
|
|
|
|
case MAC_MLS_TYPE_LEVEL:
|
|
pos = snprintf(string, size, "%d:", element->mme_level);
|
|
for (bit = 1; bit <= MAC_MLS_MAX_COMPARTMENTS; bit++) {
|
|
if (MAC_MLS_BIT_TEST(bit, element->mme_compartments))
|
|
pos += snprintf(string + pos, size - pos,
|
|
"%d+", bit);
|
|
}
|
|
if (string[pos - 1] == '+' || string[pos - 1] == ':')
|
|
string[--pos] = NULL;
|
|
return (pos);
|
|
|
|
default:
|
|
panic("mac_mls_element_to_string: invalid type (%d)",
|
|
element->mme_type);
|
|
}
|
|
}
|
|
|
|
static size_t
|
|
mac_mls_to_string(char *string, size_t size, size_t *caller_len,
|
|
struct mac_mls *mac_mls)
|
|
{
|
|
size_t left, len;
|
|
char *curptr;
|
|
|
|
bzero(string, size);
|
|
curptr = string;
|
|
left = size;
|
|
|
|
if (mac_mls->mm_flags & MAC_MLS_FLAG_SINGLE) {
|
|
len = mac_mls_element_to_string(curptr, left,
|
|
&mac_mls->mm_single);
|
|
if (len >= left)
|
|
return (EINVAL);
|
|
left -= len;
|
|
curptr += len;
|
|
}
|
|
|
|
if (mac_mls->mm_flags & MAC_MLS_FLAG_RANGE) {
|
|
len = snprintf(curptr, left, "(");
|
|
if (len >= left)
|
|
return (EINVAL);
|
|
left -= len;
|
|
curptr += len;
|
|
|
|
len = mac_mls_element_to_string(curptr, left,
|
|
&mac_mls->mm_rangelow);
|
|
if (len >= left)
|
|
return (EINVAL);
|
|
left -= len;
|
|
curptr += len;
|
|
|
|
len = snprintf(curptr, left, "-");
|
|
if (len >= left)
|
|
return (EINVAL);
|
|
left -= len;
|
|
curptr += len;
|
|
|
|
len = mac_mls_element_to_string(curptr, left,
|
|
&mac_mls->mm_rangehigh);
|
|
if (len >= left)
|
|
return (EINVAL);
|
|
left -= len;
|
|
curptr += len;
|
|
|
|
len = snprintf(curptr, left, ")");
|
|
if (len >= left)
|
|
return (EINVAL);
|
|
left -= len;
|
|
curptr += len;
|
|
}
|
|
|
|
*caller_len = strlen(string);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_externalize_label(struct label *label, char *element_name,
|
|
char *element_data, size_t size, size_t *len, int *claimed)
|
|
{
|
|
struct mac_mls *mac_mls;
|
|
int error;
|
|
|
|
if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
|
|
return (0);
|
|
|
|
(*claimed)++;
|
|
|
|
mac_mls = SLOT(label);
|
|
|
|
error = mac_mls_to_string(element_data, size, len, mac_mls);
|
|
if (error)
|
|
return (error);
|
|
|
|
*len = strlen(element_data);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_parse_element(struct mac_mls_element *element, char *string)
|
|
{
|
|
|
|
if (strcmp(string, "high") == 0 ||
|
|
strcmp(string, "hi") == 0) {
|
|
element->mme_type = MAC_MLS_TYPE_HIGH;
|
|
element->mme_level = MAC_MLS_TYPE_UNDEF;
|
|
} else if (strcmp(string, "low") == 0 ||
|
|
strcmp(string, "lo") == 0) {
|
|
element->mme_type = MAC_MLS_TYPE_LOW;
|
|
element->mme_level = MAC_MLS_TYPE_UNDEF;
|
|
} else if (strcmp(string, "equal") == 0 ||
|
|
strcmp(string, "eq") == 0) {
|
|
element->mme_type = MAC_MLS_TYPE_EQUAL;
|
|
element->mme_level = MAC_MLS_TYPE_UNDEF;
|
|
} else {
|
|
char *p0, *p1;
|
|
int d;
|
|
|
|
p0 = string;
|
|
d = strtol(p0, &p1, 10);
|
|
|
|
if (d < 0 || d > 65535)
|
|
return (EINVAL);
|
|
element->mme_type = MAC_MLS_TYPE_LEVEL;
|
|
element->mme_level = d;
|
|
|
|
if (*p1 != ':') {
|
|
if (p1 == p0 || *p1 != '\0')
|
|
return (EINVAL);
|
|
else
|
|
return (0);
|
|
}
|
|
else
|
|
if (*(p1 + 1) == '\0')
|
|
return (0);
|
|
|
|
while ((p0 = ++p1)) {
|
|
d = strtol(p0, &p1, 10);
|
|
if (d < 1 || d > MAC_MLS_MAX_COMPARTMENTS)
|
|
return (EINVAL);
|
|
|
|
MAC_MLS_BIT_SET(d, element->mme_compartments);
|
|
|
|
if (*p1 == '\0')
|
|
break;
|
|
if (p1 == p0 || *p1 != '+')
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Note: destructively consumes the string, make a local copy before
|
|
* calling if that's a problem.
|
|
*/
|
|
static int
|
|
mac_mls_parse(struct mac_mls *mac_mls, char *string)
|
|
{
|
|
char *range, *rangeend, *rangehigh, *rangelow, *single;
|
|
int error;
|
|
|
|
/* Do we have a range? */
|
|
single = string;
|
|
range = index(string, '(');
|
|
if (range == single)
|
|
single = NULL;
|
|
rangelow = rangehigh = NULL;
|
|
if (range != NULL) {
|
|
/* Nul terminate the end of the single string. */
|
|
*range = '\0';
|
|
range++;
|
|
rangelow = range;
|
|
rangehigh = index(rangelow, '-');
|
|
if (rangehigh == NULL)
|
|
return (EINVAL);
|
|
rangehigh++;
|
|
if (*rangelow == '\0' || *rangehigh == '\0')
|
|
return (EINVAL);
|
|
rangeend = index(rangehigh, ')');
|
|
if (rangeend == NULL)
|
|
return (EINVAL);
|
|
if (*(rangeend + 1) != '\0')
|
|
return (EINVAL);
|
|
/* Nul terminate the ends of the ranges. */
|
|
*(rangehigh - 1) = '\0';
|
|
*rangeend = '\0';
|
|
}
|
|
KASSERT((rangelow != NULL && rangehigh != NULL) ||
|
|
(rangelow == NULL && rangehigh == NULL),
|
|
("mac_mls_internalize_label: range mismatch"));
|
|
|
|
bzero(mac_mls, sizeof(*mac_mls));
|
|
if (single != NULL) {
|
|
error = mac_mls_parse_element(&mac_mls->mm_single, single);
|
|
if (error)
|
|
return (error);
|
|
mac_mls->mm_flags |= MAC_MLS_FLAG_SINGLE;
|
|
}
|
|
|
|
if (rangelow != NULL) {
|
|
error = mac_mls_parse_element(&mac_mls->mm_rangelow,
|
|
rangelow);
|
|
if (error)
|
|
return (error);
|
|
error = mac_mls_parse_element(&mac_mls->mm_rangehigh,
|
|
rangehigh);
|
|
if (error)
|
|
return (error);
|
|
mac_mls->mm_flags |= MAC_MLS_FLAG_RANGE;
|
|
}
|
|
|
|
error = mac_mls_valid(mac_mls);
|
|
if (error)
|
|
return (error);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_internalize_label(struct label *label, char *element_name,
|
|
char *element_data, int *claimed)
|
|
{
|
|
struct mac_mls *mac_mls, mac_mls_temp;
|
|
int error;
|
|
|
|
if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
|
|
return (0);
|
|
|
|
(*claimed)++;
|
|
|
|
error = mac_mls_parse(&mac_mls_temp, element_data);
|
|
if (error)
|
|
return (error);
|
|
|
|
mac_mls = SLOT(label);
|
|
*mac_mls = mac_mls_temp;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_mls_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_mls_create_devfs_device(dev_t dev, struct devfs_dirent *devfs_dirent,
|
|
struct label *label)
|
|
{
|
|
struct mac_mls *mac_mls;
|
|
int mls_type;
|
|
|
|
mac_mls = SLOT(label);
|
|
if (strcmp(dev->si_name, "null") == 0 ||
|
|
strcmp(dev->si_name, "zero") == 0 ||
|
|
strcmp(dev->si_name, "random") == 0 ||
|
|
strncmp(dev->si_name, "fd/", strlen("fd/")) == 0)
|
|
mls_type = MAC_MLS_TYPE_EQUAL;
|
|
else if (strcmp(dev->si_name, "kmem") == 0 ||
|
|
strcmp(dev->si_name, "mem") == 0)
|
|
mls_type = MAC_MLS_TYPE_HIGH;
|
|
else if (ptys_equal &&
|
|
(strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
|
|
strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
|
|
mls_type = MAC_MLS_TYPE_EQUAL;
|
|
else
|
|
mls_type = MAC_MLS_TYPE_LOW;
|
|
mac_mls_set_single(mac_mls, mls_type, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_devfs_directory(char *dirname, int dirnamelen,
|
|
struct devfs_dirent *devfs_dirent, struct label *label)
|
|
{
|
|
struct mac_mls *mac_mls;
|
|
|
|
mac_mls = SLOT(label);
|
|
mac_mls_set_single(mac_mls, MAC_MLS_TYPE_LOW, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_devfs_symlink(struct ucred *cred, struct devfs_dirent *dd,
|
|
struct label *ddlabel, struct devfs_dirent *de, struct label *delabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(&cred->cr_label);
|
|
dest = SLOT(delabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_devfs_vnode(struct devfs_dirent *devfs_dirent,
|
|
struct label *direntlabel, struct vnode *vp, struct label *vnodelabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(direntlabel);
|
|
dest = SLOT(vnodelabel);
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_mount(struct ucred *cred, struct mount *mp,
|
|
struct label *mntlabel, struct label *fslabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(&cred->cr_label);
|
|
dest = SLOT(mntlabel);
|
|
mac_mls_copy_single(source, dest);
|
|
dest = SLOT(fslabel);
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_root_mount(struct ucred *cred, struct mount *mp,
|
|
struct label *mntlabel, struct label *fslabel)
|
|
{
|
|
struct mac_mls *mac_mls;
|
|
|
|
/* Always mount root as high integrity. */
|
|
mac_mls = SLOT(fslabel);
|
|
mac_mls_set_single(mac_mls, MAC_MLS_TYPE_LOW, 0, NULL);
|
|
mac_mls = SLOT(mntlabel);
|
|
mac_mls_set_single(mac_mls, MAC_MLS_TYPE_LOW, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mac_mls_relabel_vnode(struct ucred *cred, struct vnode *vp,
|
|
struct label *vnodelabel, struct label *label)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(label);
|
|
dest = SLOT(vnodelabel);
|
|
|
|
mac_mls_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_update_devfsdirent(struct devfs_dirent *devfs_dirent,
|
|
struct label *direntlabel, struct vnode *vp, struct label *vnodelabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(vnodelabel);
|
|
dest = SLOT(direntlabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_associate_vnode_devfs(struct mount *mp, struct label *fslabel,
|
|
struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
|
|
struct label *vlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(delabel);
|
|
dest = SLOT(vlabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static int
|
|
mac_mls_associate_vnode_extattr(struct mount *mp, struct label *fslabel,
|
|
struct vnode *vp, struct label *vlabel)
|
|
{
|
|
struct mac_mls 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_MLS_EXTATTR_NAMESPACE,
|
|
MAC_MLS_EXTATTR_NAME, &buflen, (char *) &temp, curthread);
|
|
if (error == ENOATTR || error == EOPNOTSUPP) {
|
|
/* Fall back to the fslabel. */
|
|
mac_mls_copy_single(source, dest);
|
|
return (0);
|
|
} else if (error)
|
|
return (error);
|
|
|
|
if (buflen != sizeof(temp)) {
|
|
printf("mac_mls_associate_vnode_extattr: bad size %d\n",
|
|
buflen);
|
|
return (EPERM);
|
|
}
|
|
if (mac_mls_valid(&temp) != 0) {
|
|
printf("mac_mls_associate_vnode_extattr: invalid\n");
|
|
return (EPERM);
|
|
}
|
|
if ((temp.mm_flags & MAC_MLS_FLAGS_BOTH) != MAC_MLS_FLAG_SINGLE) {
|
|
printf("mac_mls_associated_vnode_extattr: not single\n");
|
|
return (EPERM);
|
|
}
|
|
|
|
mac_mls_copy_single(&temp, dest);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_mls_associate_vnode_singlelabel(struct mount *mp,
|
|
struct label *fslabel, struct vnode *vp, struct label *vlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(fslabel);
|
|
dest = SLOT(vlabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static int
|
|
mac_mls_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_mls *source, *dest, temp;
|
|
size_t buflen;
|
|
int error;
|
|
|
|
buflen = sizeof(temp);
|
|
bzero(&temp, buflen);
|
|
|
|
source = SLOT(&cred->cr_label);
|
|
dest = SLOT(vlabel);
|
|
mac_mls_copy_single(source, &temp);
|
|
|
|
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
|
|
MAC_MLS_EXTATTR_NAME, buflen, (char *) &temp, curthread);
|
|
if (error == 0)
|
|
mac_mls_copy_single(source, dest);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mac_mls_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *vlabel, struct label *intlabel)
|
|
{
|
|
struct mac_mls *source, temp;
|
|
size_t buflen;
|
|
int error;
|
|
|
|
buflen = sizeof(temp);
|
|
bzero(&temp, buflen);
|
|
|
|
source = SLOT(intlabel);
|
|
if ((source->mm_flags & MAC_MLS_FLAG_SINGLE) == 0)
|
|
return (0);
|
|
|
|
mac_mls_copy_single(source, &temp);
|
|
|
|
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
|
|
MAC_MLS_EXTATTR_NAME, buflen, (char *) &temp, curthread);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Labeling event operations: IPC object.
|
|
*/
|
|
static void
|
|
mac_mls_create_mbuf_from_socket(struct socket *so, struct label *socketlabel,
|
|
struct mbuf *m, struct label *mbuflabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(socketlabel);
|
|
dest = SLOT(mbuflabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_socket(struct ucred *cred, struct socket *socket,
|
|
struct label *socketlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(&cred->cr_label);
|
|
dest = SLOT(socketlabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_pipe(struct ucred *cred, struct pipe *pipe,
|
|
struct label *pipelabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(&cred->cr_label);
|
|
dest = SLOT(pipelabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_socket_from_socket(struct socket *oldsocket,
|
|
struct label *oldsocketlabel, struct socket *newsocket,
|
|
struct label *newsocketlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(oldsocketlabel);
|
|
dest = SLOT(newsocketlabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_relabel_socket(struct ucred *cred, struct socket *socket,
|
|
struct label *socketlabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(socketlabel);
|
|
|
|
mac_mls_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_relabel_pipe(struct ucred *cred, struct pipe *pipe,
|
|
struct label *pipelabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(pipelabel);
|
|
|
|
mac_mls_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel,
|
|
struct socket *socket, struct label *socketpeerlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(mbuflabel);
|
|
dest = SLOT(socketpeerlabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
/*
|
|
* Labeling event operations: network objects.
|
|
*/
|
|
static void
|
|
mac_mls_set_socket_peer_from_socket(struct socket *oldsocket,
|
|
struct label *oldsocketlabel, struct socket *newsocket,
|
|
struct label *newsocketpeerlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(oldsocketlabel);
|
|
dest = SLOT(newsocketpeerlabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d,
|
|
struct label *bpflabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(&cred->cr_label);
|
|
dest = SLOT(bpflabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel)
|
|
{
|
|
struct mac_mls *dest;
|
|
int level;
|
|
|
|
dest = SLOT(ifnetlabel);
|
|
|
|
if (ifnet->if_type == IFT_LOOP)
|
|
level = MAC_MLS_TYPE_EQUAL;
|
|
else
|
|
level = MAC_MLS_TYPE_LOW;
|
|
|
|
mac_mls_set_single(dest, level, 0, NULL);
|
|
mac_mls_set_range(dest, level, 0, NULL, level, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_ipq(struct mbuf *fragment, struct label *fragmentlabel,
|
|
struct ipq *ipq, struct label *ipqlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(fragmentlabel);
|
|
dest = SLOT(ipqlabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel,
|
|
struct mbuf *datagram, struct label *datagramlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(ipqlabel);
|
|
dest = SLOT(datagramlabel);
|
|
|
|
/* Just use the head, since we require them all to match. */
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_fragment(struct mbuf *datagram, struct label *datagramlabel,
|
|
struct mbuf *fragment, struct label *fragmentlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(datagramlabel);
|
|
dest = SLOT(fragmentlabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_mbuf_from_mbuf(struct mbuf *oldmbuf,
|
|
struct label *oldmbuflabel, struct mbuf *newmbuf,
|
|
struct label *newmbuflabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(oldmbuflabel);
|
|
dest = SLOT(newmbuflabel);
|
|
|
|
/*
|
|
* 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->mm_flags & MAC_MLS_FLAG_RANGE) == 0,
|
|
("mac_mls_create_mbuf_from_mbuf: source mbuf has range"));
|
|
mac_mls_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel,
|
|
struct mbuf *mbuf, struct label *mbuflabel)
|
|
{
|
|
struct mac_mls *dest;
|
|
|
|
dest = SLOT(mbuflabel);
|
|
|
|
mac_mls_set_single(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel,
|
|
struct mbuf *mbuf, struct label *mbuflabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(bpflabel);
|
|
dest = SLOT(mbuflabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel,
|
|
struct mbuf *m, struct label *mbuflabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(ifnetlabel);
|
|
dest = SLOT(mbuflabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_mbuf_multicast_encap(struct mbuf *oldmbuf,
|
|
struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel,
|
|
struct mbuf *newmbuf, struct label *newmbuflabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(oldmbuflabel);
|
|
dest = SLOT(newmbuflabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel,
|
|
struct mbuf *newmbuf, struct label *newmbuflabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(oldmbuflabel);
|
|
dest = SLOT(newmbuflabel);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
}
|
|
|
|
static int
|
|
mac_mls_fragment_match(struct mbuf *fragment, struct label *fragmentlabel,
|
|
struct ipq *ipq, struct label *ipqlabel)
|
|
{
|
|
struct mac_mls *a, *b;
|
|
|
|
a = SLOT(ipqlabel);
|
|
b = SLOT(fragmentlabel);
|
|
|
|
return (mac_mls_equal_single(a, b));
|
|
}
|
|
|
|
static void
|
|
mac_mls_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet,
|
|
struct label *ifnetlabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(ifnetlabel);
|
|
|
|
mac_mls_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_update_ipq(struct mbuf *fragment, struct label *fragmentlabel,
|
|
struct ipq *ipq, struct label *ipqlabel)
|
|
{
|
|
|
|
/* NOOP: we only accept matching labels, so no need to update */
|
|
}
|
|
|
|
/*
|
|
* Labeling event operations: processes.
|
|
*/
|
|
static void
|
|
mac_mls_create_cred(struct ucred *cred_parent, struct ucred *cred_child)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(&cred_parent->cr_label);
|
|
dest = SLOT(&cred_child->cr_label);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
mac_mls_copy_range(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_mls_execve_transition(struct ucred *old, struct ucred *new,
|
|
struct vnode *vp, struct label *vnodelabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(&old->cr_label);
|
|
dest = SLOT(&new->cr_label);
|
|
|
|
mac_mls_copy_single(source, dest);
|
|
mac_mls_copy_range(source, dest);
|
|
}
|
|
|
|
static int
|
|
mac_mls_execve_will_transition(struct ucred *old, struct vnode *vp,
|
|
struct label *vnodelabel)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_proc0(struct ucred *cred)
|
|
{
|
|
struct mac_mls *dest;
|
|
|
|
dest = SLOT(&cred->cr_label);
|
|
|
|
mac_mls_set_single(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
|
|
mac_mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH,
|
|
0, NULL);
|
|
}
|
|
|
|
static void
|
|
mac_mls_create_proc1(struct ucred *cred)
|
|
{
|
|
struct mac_mls *dest;
|
|
|
|
dest = SLOT(&cred->cr_label);
|
|
|
|
mac_mls_set_single(dest, MAC_MLS_TYPE_LOW, 0, NULL);
|
|
mac_mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH,
|
|
0, NULL);
|
|
}
|
|
|
|
static void
|
|
mac_mls_relabel_cred(struct ucred *cred, struct label *newlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(&cred->cr_label);
|
|
|
|
mac_mls_copy(source, dest);
|
|
}
|
|
|
|
/*
|
|
* Access control checks.
|
|
*/
|
|
static int
|
|
mac_mls_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel,
|
|
struct ifnet *ifnet, struct label *ifnetlabel)
|
|
{
|
|
struct mac_mls *a, *b;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
a = SLOT(bpflabel);
|
|
b = SLOT(ifnetlabel);
|
|
|
|
if (mac_mls_equal_single(a, b))
|
|
return (0);
|
|
return (EACCES);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_cred_relabel(struct ucred *cred, struct label *newlabel)
|
|
{
|
|
struct mac_mls *subj, *new;
|
|
int error;
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
new = SLOT(newlabel);
|
|
|
|
/*
|
|
* If there is an MLS label update for the credential, it may be
|
|
* an update of single, range, or both.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* If the MLS label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAGS_BOTH) {
|
|
/*
|
|
* To change the MLS single label on a credential, the
|
|
* new single label must be in the current range.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_SINGLE &&
|
|
!mac_mls_single_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the MLS range label on a credential, the
|
|
* new range label must be in the current range.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_RANGE &&
|
|
!mac_mls_range_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To have EQUAL in any component of the new credential
|
|
* MLS label, the subject must already have EQUAL in
|
|
* their label.
|
|
*/
|
|
if (mac_mls_contains_equal(new)) {
|
|
error = mac_mls_subject_equal_ok(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* XXXMAC: Additional consistency tests regarding the single
|
|
* and range of the new label might be performed here.
|
|
*/
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_cred_visible(struct ucred *u1, struct ucred *u2)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&u1->cr_label);
|
|
obj = SLOT(&u2->cr_label);
|
|
|
|
/* XXX: range */
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (ESRCH);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet,
|
|
struct label *ifnetlabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *subj, *new;
|
|
int error;
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
new = SLOT(newlabel);
|
|
|
|
/*
|
|
* If there is an MLS label update for the interface, it may
|
|
* be an update of single, range, or both.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* If the MLS label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAGS_BOTH) {
|
|
/*
|
|
* Rely on traditional superuser status for the MLS
|
|
* interface relabel requirements. XXX: 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_mls_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel,
|
|
struct mbuf *m, struct label *mbuflabel)
|
|
{
|
|
struct mac_mls *p, *i;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
p = SLOT(mbuflabel);
|
|
i = SLOT(ifnetlabel);
|
|
|
|
return (mac_mls_single_in_range(p, i) ? 0 : EACCES);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_mount_stat(struct ucred *cred, struct mount *mp,
|
|
struct label *mntlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(mntlabel);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe,
|
|
struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data)
|
|
{
|
|
|
|
if(!mac_mls_enabled)
|
|
return (0);
|
|
|
|
/* XXX: This will be implemented soon... */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_pipe_poll(struct ucred *cred, struct pipe *pipe,
|
|
struct label *pipelabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT((pipelabel));
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_pipe_read(struct ucred *cred, struct pipe *pipe,
|
|
struct label *pipelabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT((pipelabel));
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
|
|
struct label *pipelabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *subj, *obj, *new;
|
|
int error;
|
|
|
|
new = SLOT(newlabel);
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(pipelabel);
|
|
|
|
/*
|
|
* If there is an MLS label update for a pipe, it must be a
|
|
* single update.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAG_SINGLE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* To perform a relabel of a pipe (MLS label or not), MLS must
|
|
* authorize the relabel.
|
|
*/
|
|
if (!mac_mls_single_in_range(obj, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* If the MLS label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_SINGLE) {
|
|
/*
|
|
* To change the MLS label on a pipe, the new pipe label
|
|
* must be in the subject range.
|
|
*/
|
|
if (!mac_mls_single_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the MLS label on a pipe to be EQUAL, the
|
|
* subject must have appropriate privilege.
|
|
*/
|
|
if (mac_mls_contains_equal(new)) {
|
|
error = mac_mls_subject_equal_ok(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_pipe_stat(struct ucred *cred, struct pipe *pipe,
|
|
struct label *pipelabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT((pipelabel));
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_pipe_write(struct ucred *cred, struct pipe *pipe,
|
|
struct label *pipelabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT((pipelabel));
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_proc_debug(struct ucred *cred, struct proc *proc)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(&proc->p_ucred->cr_label);
|
|
|
|
/* XXX: range checks */
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (ESRCH);
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_proc_sched(struct ucred *cred, struct proc *proc)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(&proc->p_ucred->cr_label);
|
|
|
|
/* XXX: range checks */
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (ESRCH);
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(&proc->p_ucred->cr_label);
|
|
|
|
/* XXX: range checks */
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (ESRCH);
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_socket_deliver(struct socket *so, struct label *socketlabel,
|
|
struct mbuf *m, struct label *mbuflabel)
|
|
{
|
|
struct mac_mls *p, *s;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
p = SLOT(mbuflabel);
|
|
s = SLOT(socketlabel);
|
|
|
|
return (mac_mls_equal_single(p, s) ? 0 : EACCES);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_socket_relabel(struct ucred *cred, struct socket *socket,
|
|
struct label *socketlabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *subj, *obj, *new;
|
|
int error;
|
|
|
|
new = SLOT(newlabel);
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(socketlabel);
|
|
|
|
/*
|
|
* If there is an MLS label update for the socket, it may be
|
|
* an update of single.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAG_SINGLE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* To relabel a socket, the old socket single must be in the subject
|
|
* range.
|
|
*/
|
|
if (!mac_mls_single_in_range(obj, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* If the MLS label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_SINGLE) {
|
|
/*
|
|
* To relabel a socket, the new socket single must be in
|
|
* the subject range.
|
|
*/
|
|
if (!mac_mls_single_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the MLS label on the socket to contain EQUAL,
|
|
* the subject must have appropriate privilege.
|
|
*/
|
|
if (mac_mls_contains_equal(new)) {
|
|
error = mac_mls_subject_equal_ok(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_socket_visible(struct ucred *cred, struct socket *socket,
|
|
struct label *socketlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(socketlabel);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (ENOENT);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_chdir(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(dlabel);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_chroot(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(dlabel);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_create(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dlabel, struct componentname *cnp, struct vattr *vap)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(dlabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_delete(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dlabel, struct vnode *vp, struct label *label,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(dlabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
|
|
struct label *label, acl_type_t type)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_exec(struct ucred *cred, struct vnode *vp,
|
|
struct label *label)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_getacl(struct ucred *cred, struct vnode *vp,
|
|
struct label *label, acl_type_t type)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *label, int attrnamespace, const char *name, struct uio *uio)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_link(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dlabel, struct vnode *vp, struct label *label,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(dlabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
obj = SLOT(dlabel);
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dlabel, struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(dlabel);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_mmap(struct ucred *cred, struct vnode *vp,
|
|
struct label *label, int prot)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
/*
|
|
* Rely on the use of open()-time protections to handle
|
|
* non-revocation cases.
|
|
*/
|
|
if (!mac_mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
}
|
|
if (prot & VM_PROT_WRITE) {
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_open(struct ucred *cred, struct vnode *vp,
|
|
struct label *vnodelabel, int acc_mode)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(vnodelabel);
|
|
|
|
/* XXX privilege override for admin? */
|
|
if (acc_mode & (VREAD | VEXEC | VSTAT)) {
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
}
|
|
if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct vnode *vp, struct label *label)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&active_cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct vnode *vp, struct label *label)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&active_cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_readdir(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(dlabel);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_readlink(struct ucred *cred, struct vnode *vp,
|
|
struct label *vnodelabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(vnodelabel);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
|
|
struct label *vnodelabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *old, *new, *subj;
|
|
int error;
|
|
|
|
old = SLOT(vnodelabel);
|
|
new = SLOT(newlabel);
|
|
subj = SLOT(&cred->cr_label);
|
|
|
|
/*
|
|
* If there is an MLS label update for the vnode, it must be a
|
|
* single label.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAG_SINGLE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* To perform a relabel of the vnode (MLS label or not), MLS must
|
|
* authorize the relabel.
|
|
*/
|
|
if (!mac_mls_single_in_range(old, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* If the MLS label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_SINGLE) {
|
|
/*
|
|
* To change the MLS label on a vnode, the new vnode label
|
|
* must be in the subject range.
|
|
*/
|
|
if (!mac_mls_single_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the MLS label on the vnode to be EQUAL,
|
|
* the subject must have appropriate privilege.
|
|
*/
|
|
if (mac_mls_contains_equal(new)) {
|
|
error = mac_mls_subject_equal_ok(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
static int
|
|
mac_mls_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dlabel, struct vnode *vp, struct label *label,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(dlabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dlabel, struct vnode *vp, struct label *label, int samedir,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(dlabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
if (vp != NULL) {
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_revoke(struct ucred *cred, struct vnode *vp,
|
|
struct label *label)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_setacl(struct ucred *cred, struct vnode *vp,
|
|
struct label *label, acl_type_t type, struct acl *acl)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *vnodelabel, int attrnamespace, const char *name,
|
|
struct uio *uio)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(vnodelabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
/* XXX: protect the MAC EA in a special way? */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_setflags(struct ucred *cred, struct vnode *vp,
|
|
struct label *vnodelabel, u_long flags)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(vnodelabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_setmode(struct ucred *cred, struct vnode *vp,
|
|
struct label *vnodelabel, mode_t mode)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(vnodelabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_setowner(struct ucred *cred, struct vnode *vp,
|
|
struct label *vnodelabel, uid_t uid, gid_t gid)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(vnodelabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
|
|
struct label *vnodelabel, struct timespec atime, struct timespec mtime)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&cred->cr_label);
|
|
obj = SLOT(vnodelabel);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct vnode *vp, struct label *vnodelabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&active_cred->cr_label);
|
|
obj = SLOT(vnodelabel);
|
|
|
|
if (!mac_mls_dominate_single(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_mls_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct vnode *vp, struct label *label)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mac_mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(&active_cred->cr_label);
|
|
obj = SLOT(label);
|
|
|
|
if (!mac_mls_dominate_single(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static struct mac_policy_ops mac_mls_ops =
|
|
{
|
|
.mpo_destroy = mac_mls_destroy,
|
|
.mpo_init = mac_mls_init,
|
|
.mpo_init_bpfdesc_label = mac_mls_init_label,
|
|
.mpo_init_cred_label = mac_mls_init_label,
|
|
.mpo_init_devfsdirent_label = mac_mls_init_label,
|
|
.mpo_init_ifnet_label = mac_mls_init_label,
|
|
.mpo_init_ipq_label = mac_mls_init_label,
|
|
.mpo_init_mbuf_label = mac_mls_init_label_waitcheck,
|
|
.mpo_init_mount_label = mac_mls_init_label,
|
|
.mpo_init_mount_fs_label = mac_mls_init_label,
|
|
.mpo_init_pipe_label = mac_mls_init_label,
|
|
.mpo_init_socket_label = mac_mls_init_label_waitcheck,
|
|
.mpo_init_socket_peer_label = mac_mls_init_label_waitcheck,
|
|
.mpo_init_vnode_label = mac_mls_init_label,
|
|
.mpo_destroy_bpfdesc_label = mac_mls_destroy_label,
|
|
.mpo_destroy_cred_label = mac_mls_destroy_label,
|
|
.mpo_destroy_devfsdirent_label = mac_mls_destroy_label,
|
|
.mpo_destroy_ifnet_label = mac_mls_destroy_label,
|
|
.mpo_destroy_ipq_label = mac_mls_destroy_label,
|
|
.mpo_destroy_mbuf_label = mac_mls_destroy_label,
|
|
.mpo_destroy_mount_label = mac_mls_destroy_label,
|
|
.mpo_destroy_mount_fs_label = mac_mls_destroy_label,
|
|
.mpo_destroy_pipe_label = mac_mls_destroy_label,
|
|
.mpo_destroy_socket_label = mac_mls_destroy_label,
|
|
.mpo_destroy_socket_peer_label = mac_mls_destroy_label,
|
|
.mpo_destroy_vnode_label = mac_mls_destroy_label,
|
|
.mpo_copy_pipe_label = mac_mls_copy_label,
|
|
.mpo_copy_vnode_label = mac_mls_copy_label,
|
|
.mpo_externalize_cred_label = mac_mls_externalize_label,
|
|
.mpo_externalize_ifnet_label = mac_mls_externalize_label,
|
|
.mpo_externalize_pipe_label = mac_mls_externalize_label,
|
|
.mpo_externalize_socket_label = mac_mls_externalize_label,
|
|
.mpo_externalize_socket_peer_label = mac_mls_externalize_label,
|
|
.mpo_externalize_vnode_label = mac_mls_externalize_label,
|
|
.mpo_internalize_cred_label = mac_mls_internalize_label,
|
|
.mpo_internalize_ifnet_label = mac_mls_internalize_label,
|
|
.mpo_internalize_pipe_label = mac_mls_internalize_label,
|
|
.mpo_internalize_socket_label = mac_mls_internalize_label,
|
|
.mpo_internalize_vnode_label = mac_mls_internalize_label,
|
|
.mpo_create_devfs_device = mac_mls_create_devfs_device,
|
|
.mpo_create_devfs_directory = mac_mls_create_devfs_directory,
|
|
.mpo_create_devfs_symlink = mac_mls_create_devfs_symlink,
|
|
.mpo_create_devfs_vnode = mac_mls_create_devfs_vnode,
|
|
.mpo_create_mount = mac_mls_create_mount,
|
|
.mpo_create_root_mount = mac_mls_create_root_mount,
|
|
.mpo_relabel_vnode = mac_mls_relabel_vnode,
|
|
.mpo_update_devfsdirent = mac_mls_update_devfsdirent,
|
|
.mpo_associate_vnode_devfs = mac_mls_associate_vnode_devfs,
|
|
.mpo_associate_vnode_extattr = mac_mls_associate_vnode_extattr,
|
|
.mpo_associate_vnode_singlelabel = mac_mls_associate_vnode_singlelabel,
|
|
.mpo_create_vnode_extattr = mac_mls_create_vnode_extattr,
|
|
.mpo_setlabel_vnode_extattr = mac_mls_setlabel_vnode_extattr,
|
|
.mpo_create_mbuf_from_socket = mac_mls_create_mbuf_from_socket,
|
|
.mpo_create_pipe = mac_mls_create_pipe,
|
|
.mpo_create_socket = mac_mls_create_socket,
|
|
.mpo_create_socket_from_socket = mac_mls_create_socket_from_socket,
|
|
.mpo_relabel_pipe = mac_mls_relabel_pipe,
|
|
.mpo_relabel_socket = mac_mls_relabel_socket,
|
|
.mpo_set_socket_peer_from_mbuf = mac_mls_set_socket_peer_from_mbuf,
|
|
.mpo_set_socket_peer_from_socket = mac_mls_set_socket_peer_from_socket,
|
|
.mpo_create_bpfdesc = mac_mls_create_bpfdesc,
|
|
.mpo_create_datagram_from_ipq = mac_mls_create_datagram_from_ipq,
|
|
.mpo_create_fragment = mac_mls_create_fragment,
|
|
.mpo_create_ifnet = mac_mls_create_ifnet,
|
|
.mpo_create_ipq = mac_mls_create_ipq,
|
|
.mpo_create_mbuf_from_mbuf = mac_mls_create_mbuf_from_mbuf,
|
|
.mpo_create_mbuf_linklayer = mac_mls_create_mbuf_linklayer,
|
|
.mpo_create_mbuf_from_bpfdesc = mac_mls_create_mbuf_from_bpfdesc,
|
|
.mpo_create_mbuf_from_ifnet = mac_mls_create_mbuf_from_ifnet,
|
|
.mpo_create_mbuf_multicast_encap = mac_mls_create_mbuf_multicast_encap,
|
|
.mpo_create_mbuf_netlayer = mac_mls_create_mbuf_netlayer,
|
|
.mpo_fragment_match = mac_mls_fragment_match,
|
|
.mpo_relabel_ifnet = mac_mls_relabel_ifnet,
|
|
.mpo_update_ipq = mac_mls_update_ipq,
|
|
.mpo_create_cred = mac_mls_create_cred,
|
|
.mpo_execve_transition = mac_mls_execve_transition,
|
|
.mpo_execve_will_transition = mac_mls_execve_will_transition,
|
|
.mpo_create_proc0 = mac_mls_create_proc0,
|
|
.mpo_create_proc1 = mac_mls_create_proc1,
|
|
.mpo_relabel_cred = mac_mls_relabel_cred,
|
|
.mpo_check_bpfdesc_receive = mac_mls_check_bpfdesc_receive,
|
|
.mpo_check_cred_relabel = mac_mls_check_cred_relabel,
|
|
.mpo_check_cred_visible = mac_mls_check_cred_visible,
|
|
.mpo_check_ifnet_relabel = mac_mls_check_ifnet_relabel,
|
|
.mpo_check_ifnet_transmit = mac_mls_check_ifnet_transmit,
|
|
.mpo_check_mount_stat = mac_mls_check_mount_stat,
|
|
.mpo_check_pipe_ioctl = mac_mls_check_pipe_ioctl,
|
|
.mpo_check_pipe_poll = mac_mls_check_pipe_poll,
|
|
.mpo_check_pipe_read = mac_mls_check_pipe_read,
|
|
.mpo_check_pipe_relabel = mac_mls_check_pipe_relabel,
|
|
.mpo_check_pipe_stat = mac_mls_check_pipe_stat,
|
|
.mpo_check_pipe_write = mac_mls_check_pipe_write,
|
|
.mpo_check_proc_debug = mac_mls_check_proc_debug,
|
|
.mpo_check_proc_sched = mac_mls_check_proc_sched,
|
|
.mpo_check_proc_signal = mac_mls_check_proc_signal,
|
|
.mpo_check_socket_deliver = mac_mls_check_socket_deliver,
|
|
.mpo_check_socket_relabel = mac_mls_check_socket_relabel,
|
|
.mpo_check_socket_visible = mac_mls_check_socket_visible,
|
|
.mpo_check_vnode_access = mac_mls_check_vnode_open,
|
|
.mpo_check_vnode_chdir = mac_mls_check_vnode_chdir,
|
|
.mpo_check_vnode_chroot = mac_mls_check_vnode_chroot,
|
|
.mpo_check_vnode_create = mac_mls_check_vnode_create,
|
|
.mpo_check_vnode_delete = mac_mls_check_vnode_delete,
|
|
.mpo_check_vnode_deleteacl = mac_mls_check_vnode_deleteacl,
|
|
.mpo_check_vnode_exec = mac_mls_check_vnode_exec,
|
|
.mpo_check_vnode_getacl = mac_mls_check_vnode_getacl,
|
|
.mpo_check_vnode_getextattr = mac_mls_check_vnode_getextattr,
|
|
.mpo_check_vnode_link = mac_mls_check_vnode_link,
|
|
.mpo_check_vnode_lookup = mac_mls_check_vnode_lookup,
|
|
.mpo_check_vnode_mmap = mac_mls_check_vnode_mmap,
|
|
.mpo_check_vnode_mprotect = mac_mls_check_vnode_mmap,
|
|
.mpo_check_vnode_open = mac_mls_check_vnode_open,
|
|
.mpo_check_vnode_poll = mac_mls_check_vnode_poll,
|
|
.mpo_check_vnode_read = mac_mls_check_vnode_read,
|
|
.mpo_check_vnode_readdir = mac_mls_check_vnode_readdir,
|
|
.mpo_check_vnode_readlink = mac_mls_check_vnode_readlink,
|
|
.mpo_check_vnode_relabel = mac_mls_check_vnode_relabel,
|
|
.mpo_check_vnode_rename_from = mac_mls_check_vnode_rename_from,
|
|
.mpo_check_vnode_rename_to = mac_mls_check_vnode_rename_to,
|
|
.mpo_check_vnode_revoke = mac_mls_check_vnode_revoke,
|
|
.mpo_check_vnode_setacl = mac_mls_check_vnode_setacl,
|
|
.mpo_check_vnode_setextattr = mac_mls_check_vnode_setextattr,
|
|
.mpo_check_vnode_setflags = mac_mls_check_vnode_setflags,
|
|
.mpo_check_vnode_setmode = mac_mls_check_vnode_setmode,
|
|
.mpo_check_vnode_setowner = mac_mls_check_vnode_setowner,
|
|
.mpo_check_vnode_setutimes = mac_mls_check_vnode_setutimes,
|
|
.mpo_check_vnode_stat = mac_mls_check_vnode_stat,
|
|
.mpo_check_vnode_write = mac_mls_check_vnode_write,
|
|
};
|
|
|
|
MAC_POLICY_SET(&mac_mls_ops, trustedbsd_mac_mls, "TrustedBSD MAC/MLS",
|
|
MPC_LOADTIME_FLAG_NOTLATE, &mac_mls_slot);
|