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freebsd-nq/sys/security/mac_mls/mac_mls.c
Robert Watson 12613c76cc Place more stringent checks on process credential relabeling for the Biba 
and MLS policies: as we support both an effective (single) element and
range (available) elements, require that the single be in the range if
both the single and range are defined in the update.  Remove comments
suggesting that such a check might be a good idea.

Don't introduce a similar check for network interfaces; due to different
interpretations of the single and range elements, it's not clear that
it's useful to do so.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories
2003-02-04 21:28:46 +00:00

2491 lines
58 KiB
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/*-
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
* Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* This software was developed for the FreeBSD Project in part by 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 = 1;
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(0);
}
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(struct mount *mp, 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(struct mount *mp, 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 mount *mp,
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_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 mount *mp,
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 type;
dest = SLOT(ifnetlabel);
if (ifnet->if_type == IFT_LOOP)
type = MAC_MLS_TYPE_EQUAL;
else
type = MAC_MLS_TYPE_LOW;
mac_mls_set_single(dest, type, 0, NULL);
mac_mls_set_range(dest, type, 0, NULL, type, 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_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) {
/*
* If the change request modifies both the MLS label single
* and range, check that the new single will be in the
* new range.
*/
if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) ==
MAC_MLS_FLAGS_BOTH &&
!mac_mls_single_in_range(new, new))
return (EINVAL);
/*
* 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 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);
}
}
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 image_params *imgp,
struct label *execlabel)
{
struct mac_mls *subj, *obj, *exec;
int error;
if (execlabel != NULL) {
/*
* We currently don't permit labels to be changed at
* exec-time as part of MLS, so disallow non-NULL
* MLS label elements in the execlabel.
*/
exec = SLOT(execlabel);
error = mls_atmostflags(exec, 0);
if (error)
return (error);
}
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_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_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);
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