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a163d034fa
freebsd/sys/security/mac_mls/mac_mls.c
Warner Losh a163d034fa Back out M_* changes, per decision of the TRB. 
Approved by: trb
2003-02-19 05:47:46 +00:00

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/*-
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
* Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* This software was developed for the FreeBSD Project in part by 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(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(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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