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freebsd-skq/sys/security/mac_mls/mac_mls.c
Konstantin Belousov 940cb0e2bb Implement read(2)/write(2) and neccessary lseek(2) for posix shmfd. 
Add MAC framework entries for posix shm read and write.

Do not allow implicit extension of the underlying memory segment past
the limit set by ftruncate(2) by either of the syscalls.  Read and
write returns short i/o, lseek(2) fails with EINVAL when resulting
offset does not fit into the limit.

Discussed with:	alc
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
2013-08-21 17:45:00 +00:00

3440 lines
75 KiB
C
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/*-
* Copyright (c) 1999-2002, 2007-2011 Robert N. M. Watson
* Copyright (c) 2001-2005 McAfee, Inc.
* Copyright (c) 2006 SPARTA, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* This software was developed for the FreeBSD Project in part by McAfee
* Research, the Security Research Division of McAfee, Inc. under
* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
* CHATS research program.
*
* This software was enhanced by SPARTA ISSO under SPAWAR contract
* N66001-04-C-6019 ("SEFOS").
*
* This software was developed at the University of Cambridge Computer
* Laboratory with support from a grant from Google, Inc.
*
* 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/ksem.h>
#include <sys/mman.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/sysent.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/pipe.h>
#include <sys/sx.h>
#include <sys/sysctl.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <fs/devfs/devfs.h>
#include <net/bpfdesc.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <vm/uma.h>
#include <vm/vm.h>
#include <security/mac/mac_policy.h>
#include <security/mac_mls/mac_mls.h>
SYSCTL_DECL(_security_mac);
static SYSCTL_NODE(_security_mac, OID_AUTO, mls, CTLFLAG_RW, 0,
"TrustedBSD mac_mls policy controls");
static int mls_label_size = sizeof(struct mac_mls);
SYSCTL_INT(_security_mac_mls, OID_AUTO, label_size, CTLFLAG_RD,
&mls_label_size, 0, "Size of struct mac_mls");
static int mls_enabled = 1;
SYSCTL_INT(_security_mac_mls, OID_AUTO, enabled, CTLFLAG_RW, &mls_enabled, 0,
"Enforce MAC/MLS policy");
TUNABLE_INT("security.mac.mls.enabled", &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 mls_slot;
#define SLOT(l) ((struct mac_mls *)mac_label_get((l), mls_slot))
#define SLOT_SET(l, val) mac_label_set((l), mls_slot, (uintptr_t)(val))
static uma_zone_t zone_mls;
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)
{
return (uma_zalloc(zone_mls, flag | M_ZERO));
}
static void
mls_free(struct mac_mls *mm)
{
if (mm != NULL)
uma_zfree(zone_mls, mm);
else
atomic_add_int(&destroyed_not_inited, 1);
}
static int
mls_atmostflags(struct mac_mls *mm, int flags)
{
if ((mm->mm_flags & flags) != mm->mm_flags)
return (EINVAL);
return (0);
}
static int
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("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("mls_dominate_element: b->mme_type invalid");
}
default:
panic("mls_dominate_element: a->mme_type invalid");
}
return (0);
}
static int
mls_range_in_range(struct mac_mls *rangea, struct mac_mls *rangeb)
{
return (mls_dominate_element(&rangeb->mm_rangehigh,
&rangea->mm_rangehigh) &&
mls_dominate_element(&rangea->mm_rangelow,
&rangeb->mm_rangelow));
}
static int
mls_effective_in_range(struct mac_mls *effective, struct mac_mls *range)
{
KASSERT((effective->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
("mls_effective_in_range: a not effective"));
KASSERT((range->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
("mls_effective_in_range: b not range"));
return (mls_dominate_element(&range->mm_rangehigh,
&effective->mm_effective) &&
mls_dominate_element(&effective->mm_effective,
&range->mm_rangelow));
return (1);
}
static int
mls_dominate_effective(struct mac_mls *a, struct mac_mls *b)
{
KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
("mls_dominate_effective: a not effective"));
KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
("mls_dominate_effective: b not effective"));
return (mls_dominate_element(&a->mm_effective, &b->mm_effective));
}
static int
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
mls_equal_effective(struct mac_mls *a, struct mac_mls *b)
{
KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
("mls_equal_effective: a not effective"));
KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
("mls_equal_effective: b not effective"));
return (mls_equal_element(&a->mm_effective, &b->mm_effective));
}
static int
mls_contains_equal(struct mac_mls *mm)
{
if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE)
if (mm->mm_effective.mme_type == MAC_MLS_TYPE_EQUAL)
return (1);
if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL)
return (1);
if (mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL)
return (1);
}
return (0);
}
static int
mls_subject_privileged(struct mac_mls *mm)
{
KASSERT((mm->mm_flags & MAC_MLS_FLAGS_BOTH) == MAC_MLS_FLAGS_BOTH,
("mls_subject_privileged: subject doesn't have both labels"));
/* If the effective is EQUAL, it's ok. */
if (mm->mm_effective.mme_type == MAC_MLS_TYPE_EQUAL)
return (0);
/* If either range endpoint is EQUAL, it's ok. */
if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL ||
mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_EQUAL)
return (0);
/* If the range is low-high, it's ok. */
if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_LOW &&
mm->mm_rangehigh.mme_type == MAC_MLS_TYPE_HIGH)
return (0);
/* It's not ok. */
return (EPERM);
}
static int
mls_valid(struct mac_mls *mm)
{
if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
switch (mm->mm_effective.mme_type) {
case MAC_MLS_TYPE_LEVEL:
break;
case MAC_MLS_TYPE_EQUAL:
case MAC_MLS_TYPE_HIGH:
case MAC_MLS_TYPE_LOW:
if (mm->mm_effective.mme_level != 0 ||
!MAC_MLS_BIT_SET_EMPTY(
mm->mm_effective.mme_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
} else {
if (mm->mm_effective.mme_type != MAC_MLS_TYPE_UNDEF)
return (EINVAL);
}
if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
switch (mm->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 (mm->mm_rangelow.mme_level != 0 ||
!MAC_MLS_BIT_SET_EMPTY(
mm->mm_rangelow.mme_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
switch (mm->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 (mm->mm_rangehigh.mme_level != 0 ||
!MAC_MLS_BIT_SET_EMPTY(
mm->mm_rangehigh.mme_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
if (!mls_dominate_element(&mm->mm_rangehigh,
&mm->mm_rangelow))
return (EINVAL);
} else {
if (mm->mm_rangelow.mme_type != MAC_MLS_TYPE_UNDEF ||
mm->mm_rangehigh.mme_type != MAC_MLS_TYPE_UNDEF)
return (EINVAL);
}
return (0);
}
static void
mls_set_range(struct mac_mls *mm, u_short typelow, u_short levellow,
u_char *compartmentslow, u_short typehigh, u_short levelhigh,
u_char *compartmentshigh)
{
mm->mm_rangelow.mme_type = typelow;
mm->mm_rangelow.mme_level = levellow;
if (compartmentslow != NULL)
memcpy(mm->mm_rangelow.mme_compartments, compartmentslow,
sizeof(mm->mm_rangelow.mme_compartments));
mm->mm_rangehigh.mme_type = typehigh;
mm->mm_rangehigh.mme_level = levelhigh;
if (compartmentshigh != NULL)
memcpy(mm->mm_rangehigh.mme_compartments, compartmentshigh,
sizeof(mm->mm_rangehigh.mme_compartments));
mm->mm_flags |= MAC_MLS_FLAG_RANGE;
}
static void
mls_set_effective(struct mac_mls *mm, u_short type, u_short level,
u_char *compartments)
{
mm->mm_effective.mme_type = type;
mm->mm_effective.mme_level = level;
if (compartments != NULL)
memcpy(mm->mm_effective.mme_compartments, compartments,
sizeof(mm->mm_effective.mme_compartments));
mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
}
static void
mls_copy_range(struct mac_mls *labelfrom, struct mac_mls *labelto)
{
KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
("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
mls_copy_effective(struct mac_mls *labelfrom, struct mac_mls *labelto)
{
KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
("mls_copy_effective: labelfrom not effective"));
labelto->mm_effective = labelfrom->mm_effective;
labelto->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
}
static void
mls_copy(struct mac_mls *source, struct mac_mls *dest)
{
if (source->mm_flags & MAC_MLS_FLAG_EFFECTIVE)
mls_copy_effective(source, dest);
if (source->mm_flags & MAC_MLS_FLAG_RANGE)
mls_copy_range(source, dest);
}
/*
* Policy module operations.
*/
static void
mls_init(struct mac_policy_conf *conf)
{
zone_mls = uma_zcreate("mac_mls", sizeof(struct mac_mls), NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
}
/*
* Label operations.
*/
static void
mls_init_label(struct label *label)
{
SLOT_SET(label, mls_alloc(M_WAITOK));
}
static int
mls_init_label_waitcheck(struct label *label, int flag)
{
SLOT_SET(label, mls_alloc(flag));
if (SLOT(label) == NULL)
return (ENOMEM);
return (0);
}
static void
mls_destroy_label(struct label *label)
{
mls_free(SLOT(label));
SLOT_SET(label, NULL);
}
/*
* mls_element_to_string() accepts an sbuf and MLS element. It converts the
* MLS element to a string and stores the result in the sbuf; if there isn't
* space in the sbuf, -1 is returned.
*/
static int
mls_element_to_string(struct sbuf *sb, struct mac_mls_element *element)
{
int i, first;
switch (element->mme_type) {
case MAC_MLS_TYPE_HIGH:
return (sbuf_printf(sb, "high"));
case MAC_MLS_TYPE_LOW:
return (sbuf_printf(sb, "low"));
case MAC_MLS_TYPE_EQUAL:
return (sbuf_printf(sb, "equal"));
case MAC_MLS_TYPE_LEVEL:
if (sbuf_printf(sb, "%d", element->mme_level) == -1)
return (-1);
first = 1;
for (i = 1; i <= MAC_MLS_MAX_COMPARTMENTS; i++) {
if (MAC_MLS_BIT_TEST(i, element->mme_compartments)) {
if (first) {
if (sbuf_putc(sb, ':') == -1)
return (-1);
if (sbuf_printf(sb, "%d", i) == -1)
return (-1);
first = 0;
} else {
if (sbuf_printf(sb, "+%d", i) == -1)
return (-1);
}
}
}
return (0);
default:
panic("mls_element_to_string: invalid type (%d)",
element->mme_type);
}
}
/*
* mls_to_string() converts an MLS label to a string, and places the results
* in the passed sbuf. It returns 0 on success, or EINVAL if there isn't
* room in the sbuf. Note: the sbuf will be modified even in a failure case,
* so the caller may need to revert the sbuf by restoring the offset if
* that's undesired.
*/
static int
mls_to_string(struct sbuf *sb, struct mac_mls *mm)
{
if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
if (mls_element_to_string(sb, &mm->mm_effective) == -1)
return (EINVAL);
}
if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
if (sbuf_putc(sb, '(') == -1)
return (EINVAL);
if (mls_element_to_string(sb, &mm->mm_rangelow) == -1)
return (EINVAL);
if (sbuf_putc(sb, '-') == -1)
return (EINVAL);
if (mls_element_to_string(sb, &mm->mm_rangehigh) == -1)
return (EINVAL);
if (sbuf_putc(sb, ')') == -1)
return (EINVAL);
}
return (0);
}
static int
mls_externalize_label(struct label *label, char *element_name,
struct sbuf *sb, int *claimed)
{
struct mac_mls *mm;
if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
mm = SLOT(label);
return (mls_to_string(sb, mm));
}
static int
mls_parse_element(struct mac_mls_element *element, char *string)
{
char *compartment, *end, *level;
int value;
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 {
element->mme_type = MAC_MLS_TYPE_LEVEL;
/*
* Numeric level piece of the element.
*/
level = strsep(&string, ":");
value = strtol(level, &end, 10);
if (end == level || *end != '\0')
return (EINVAL);
if (value < 0 || value > 65535)
return (EINVAL);
element->mme_level = value;
/*
* Optional compartment piece of the element. If none are
* included, we assume that the label has no compartments.
*/
if (string == NULL)
return (0);
if (*string == '\0')
return (0);
while ((compartment = strsep(&string, "+")) != NULL) {
value = strtol(compartment, &end, 10);
if (compartment == end || *end != '\0')
return (EINVAL);
if (value < 1 || value > MAC_MLS_MAX_COMPARTMENTS)
return (EINVAL);
MAC_MLS_BIT_SET(value, element->mme_compartments);
}
}
return (0);
}
/*
* Note: destructively consumes the string, make a local copy before calling
* if that's a problem.
*/
static int
mls_parse(struct mac_mls *mm, char *string)
{
char *rangehigh, *rangelow, *effective;
int error;
effective = strsep(&string, "(");
if (*effective == '\0')
effective = NULL;
if (string != NULL) {
rangelow = strsep(&string, "-");
if (string == NULL)
return (EINVAL);
rangehigh = strsep(&string, ")");
if (string == NULL)
return (EINVAL);
if (*string != '\0')
return (EINVAL);
} else {
rangelow = NULL;
rangehigh = NULL;
}
KASSERT((rangelow != NULL && rangehigh != NULL) ||
(rangelow == NULL && rangehigh == NULL),
("mls_parse: range mismatch"));
bzero(mm, sizeof(*mm));
if (effective != NULL) {
error = mls_parse_element(&mm->mm_effective, effective);
if (error)
return (error);
mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
}
if (rangelow != NULL) {
error = mls_parse_element(&mm->mm_rangelow, rangelow);
if (error)
return (error);
error = mls_parse_element(&mm->mm_rangehigh, rangehigh);
if (error)
return (error);
mm->mm_flags |= MAC_MLS_FLAG_RANGE;
}
error = mls_valid(mm);
if (error)
return (error);
return (0);
}
static int
mls_internalize_label(struct label *label, char *element_name,
char *element_data, int *claimed)
{
struct mac_mls *mm, mm_temp;
int error;
if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
error = mls_parse(&mm_temp, element_data);
if (error)
return (error);
mm = SLOT(label);
*mm = mm_temp;
return (0);
}
static void
mls_copy_label(struct label *src, struct label *dest)
{
*SLOT(dest) = *SLOT(src);
}
/*
* Object-specific entry point implementations are sorted alphabetically by
* object type name and then by operation.
*/
static int
mls_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
struct ifnet *ifp, struct label *ifplabel)
{
struct mac_mls *a, *b;
if (!mls_enabled)
return (0);
a = SLOT(dlabel);
b = SLOT(ifplabel);
if (mls_equal_effective(a, b))
return (0);
return (EACCES);
}
static void
mls_bpfdesc_create(struct ucred *cred, struct bpf_d *d, struct label *dlabel)
{
struct mac_mls *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(dlabel);
mls_copy_effective(source, dest);
}
static void
mls_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *source, *dest;
source = SLOT(dlabel);
dest = SLOT(mlabel);
mls_copy_effective(source, dest);
}
static void
mls_cred_associate_nfsd(struct ucred *cred)
{
struct mac_mls *label;
label = SLOT(cred->cr_label);
mls_set_effective(label, MAC_MLS_TYPE_LOW, 0, NULL);
mls_set_range(label, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
NULL);
}
static int
mls_cred_check_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 effective, 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
* effective and range, check that the new effective will be
* in the new range.
*/
if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) ==
MAC_MLS_FLAGS_BOTH && !mls_effective_in_range(new, new))
return (EINVAL);
/*
* To change the MLS effective label on a credential, the new
* effective label must be in the current range.
*/
if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE &&
!mls_effective_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 &&
!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 (mls_contains_equal(new)) {
error = mls_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mls_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cr1->cr_label);
obj = SLOT(cr2->cr_label);
/* XXX: range */
if (!mls_dominate_effective(subj, obj))
return (ESRCH);
return (0);
}
static void
mls_cred_create_init(struct ucred *cred)
{
struct mac_mls *dest;
dest = SLOT(cred->cr_label);
mls_set_effective(dest, MAC_MLS_TYPE_LOW, 0, NULL);
mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
NULL);
}
static void
mls_cred_create_swapper(struct ucred *cred)
{
struct mac_mls *dest;
dest = SLOT(cred->cr_label);
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
NULL);
}
static void
mls_cred_relabel(struct ucred *cred, struct label *newlabel)
{
struct mac_mls *source, *dest;
source = SLOT(newlabel);
dest = SLOT(cred->cr_label);
mls_copy(source, dest);
}
static void
mls_devfs_create_device(struct ucred *cred, struct mount *mp,
struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
{
struct mac_mls *mm;
const char *dn;
int mls_type;
mm = SLOT(delabel);
dn = devtoname(dev);
if (strcmp(dn, "null") == 0 ||
strcmp(dn, "zero") == 0 ||
strcmp(dn, "random") == 0 ||
strncmp(dn, "fd/", strlen("fd/")) == 0)
mls_type = MAC_MLS_TYPE_EQUAL;
else if (strcmp(dn, "kmem") == 0 ||
strcmp(dn, "mem") == 0)
mls_type = MAC_MLS_TYPE_HIGH;
else if (ptys_equal &&
(strncmp(dn, "ttyp", strlen("ttyp")) == 0 ||
strncmp(dn, "pts/", strlen("pts/")) == 0 ||
strncmp(dn, "ptyp", strlen("ptyp")) == 0))
mls_type = MAC_MLS_TYPE_EQUAL;
else
mls_type = MAC_MLS_TYPE_LOW;
mls_set_effective(mm, mls_type, 0, NULL);
}
static void
mls_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
struct devfs_dirent *de, struct label *delabel)
{
struct mac_mls *mm;
mm = SLOT(delabel);
mls_set_effective(mm, MAC_MLS_TYPE_LOW, 0, NULL);
}
static void
mls_devfs_create_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);
mls_copy_effective(source, dest);
}
static void
mls_devfs_update(struct mount *mp, struct devfs_dirent *de,
struct label *delabel, struct vnode *vp, struct label *vplabel)
{
struct mac_mls *source, *dest;
source = SLOT(vplabel);
dest = SLOT(delabel);
mls_copy_effective(source, dest);
}
static void
mls_devfs_vnode_associate(struct mount *mp, struct label *mplabel,
struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
struct label *vplabel)
{
struct mac_mls *source, *dest;
source = SLOT(delabel);
dest = SLOT(vplabel);
mls_copy_effective(source, dest);
}
static int
mls_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
struct label *ifplabel, 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 effective, range, or both.
*/
error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH);
if (error)
return (error);
/*
* Relabeling network interfaces requires MLS privilege.
*/
return (mls_subject_privileged(subj));
}
static int
mls_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *p, *i;
if (!mls_enabled)
return (0);
p = SLOT(mlabel);
i = SLOT(ifplabel);
return (mls_effective_in_range(p, i) ? 0 : EACCES);
}
static void
mls_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
{
struct mac_mls *dest;
int type;
dest = SLOT(ifplabel);
if (ifp->if_type == IFT_LOOP)
type = MAC_MLS_TYPE_EQUAL;
else
type = MAC_MLS_TYPE_LOW;
mls_set_effective(dest, type, 0, NULL);
mls_set_range(dest, type, 0, NULL, type, 0, NULL);
}
static void
mls_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *source, *dest;
source = SLOT(ifplabel);
dest = SLOT(mlabel);
mls_copy_effective(source, dest);
}
static void
mls_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
struct label *ifplabel, struct label *newlabel)
{
struct mac_mls *source, *dest;
source = SLOT(newlabel);
dest = SLOT(ifplabel);
mls_copy(source, dest);
}
static int
mls_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *p, *i;
if (!mls_enabled)
return (0);
p = SLOT(mlabel);
i = SLOT(inplabel);
return (mls_equal_effective(p, i) ? 0 : EACCES);
}
static int
mls_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
struct label *inplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(inplabel);
if (!mls_dominate_effective(subj, obj))
return (ENOENT);
return (0);
}
static void
mls_inpcb_create(struct socket *so, struct label *solabel, struct inpcb *inp,
struct label *inplabel)
{
struct mac_mls *source, *dest;
source = SLOT(solabel);
dest = SLOT(inplabel);
mls_copy_effective(source, dest);
}
static void
mls_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *source, *dest;
source = SLOT(inplabel);
dest = SLOT(mlabel);
mls_copy_effective(source, dest);
}
static void
mls_inpcb_sosetlabel(struct socket *so, struct label *solabel,
struct inpcb *inp, struct label *inplabel)
{
struct mac_mls *source, *dest;
SOCK_LOCK_ASSERT(so);
source = SLOT(solabel);
dest = SLOT(inplabel);
mls_copy(source, dest);
}
static void
mls_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
struct label *q6label)
{
struct mac_mls *source, *dest;
source = SLOT(mlabel);
dest = SLOT(q6label);
mls_copy_effective(source, dest);
}
static int
mls_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
struct label *q6label)
{
struct mac_mls *a, *b;
a = SLOT(q6label);
b = SLOT(mlabel);
return (mls_equal_effective(a, b));
}
static void
mls_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
struct label *mlabel)
{
struct mac_mls *source, *dest;
source = SLOT(q6label);
dest = SLOT(mlabel);
/* Just use the head, since we require them all to match. */
mls_copy_effective(source, dest);
}
static void
mls_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
struct label *q6label)
{
/* NOOP: we only accept matching labels, so no need to update */
}
static void
mls_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
struct label *qlabel)
{
struct mac_mls *source, *dest;
source = SLOT(mlabel);
dest = SLOT(qlabel);
mls_copy_effective(source, dest);
}
static int
mls_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
struct label *qlabel)
{
struct mac_mls *a, *b;
a = SLOT(qlabel);
b = SLOT(mlabel);
return (mls_equal_effective(a, b));
}
static void
mls_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
struct label *mlabel)
{
struct mac_mls *source, *dest;
source = SLOT(qlabel);
dest = SLOT(mlabel);
/* Just use the head, since we require them all to match. */
mls_copy_effective(source, dest);
}
static void
mls_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
struct label *qlabel)
{
/* NOOP: we only accept matching labels, so no need to update */
}
static int
mls_mount_check_stat(struct ucred *cred, struct mount *mp,
struct label *mntlabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(mntlabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static void
mls_mount_create(struct ucred *cred, struct mount *mp, struct label *mplabel)
{
struct mac_mls *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(mplabel);
mls_copy_effective(source, dest);
}
static void
mls_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *dest;
dest = SLOT(mlabel);
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
}
static void
mls_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *dest;
dest = SLOT(mlabel);
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
}
static void
mls_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
struct mbuf *msend, struct label *msendlabel)
{
struct mac_mls *source, *dest;
source = SLOT(mrecvlabel);
dest = SLOT(msendlabel);
mls_copy_effective(source, dest);
}
static void
mls_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
{
struct mac_mls *dest;
dest = SLOT(mlabel);
/* XXX: where is the label for the firewall really comming from? */
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
}
static void
mls_netinet_fragment(struct mbuf *m, struct label *mlabel, struct mbuf *frag,
struct label *fraglabel)
{
struct mac_mls *source, *dest;
source = SLOT(mlabel);
dest = SLOT(fraglabel);
mls_copy_effective(source, dest);
}
static void
mls_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
struct mbuf *msend, struct label *msendlabel)
{
struct mac_mls *source, *dest;
source = SLOT(mrecvlabel);
dest = SLOT(msendlabel);
mls_copy_effective(source, dest);
}
static void
mls_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *dest;
dest = SLOT(mlabel);
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
}
static void
mls_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *dest;
dest = SLOT(mlabel);
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
}
static int
mls_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
{
if (!mls_enabled)
return (0);
/* XXX: This will be implemented soon... */
return (0);
}
static int
mls_pipe_check_poll(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_pipe_check_read(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, struct label *newlabel)
{
struct mac_mls *subj, *obj, *new;
int error;
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
/*
* If there is an MLS label update for a pipe, it must be a effective
* update.
*/
error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To perform a relabel of a pipe (MLS label or not), MLS must
* authorize the relabel.
*/
if (!mls_effective_in_range(obj, subj))
return (EPERM);
/*
* If the MLS label is to be changed, authorize as appropriate.
*/
if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
/*
* To change the MLS label on a pipe, the new pipe label must
* be in the subject range.
*/
if (!mls_effective_in_range(new, subj))
return (EPERM);
/*
* To change the MLS label on a pipe to be EQUAL, the subject
* must have appropriate privilege.
*/
if (mls_contains_equal(new)) {
error = mls_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mls_pipe_check_stat(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_pipe_check_write(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static void
mls_pipe_create(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_mls *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(pplabel);
mls_copy_effective(source, dest);
}
static void
mls_pipe_relabel(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, struct label *newlabel)
{
struct mac_mls *source, *dest;
source = SLOT(newlabel);
dest = SLOT(pplabel);
mls_copy(source, dest);
}
static int
mls_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks,
struct label *kslabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(kslabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred,
struct ksem *ks, struct label *kslabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(kslabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_posixsem_check_setmode(struct ucred *cred, struct ksem *ks,
struct label *shmlabel, mode_t mode)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmlabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_posixsem_check_setowner(struct ucred *cred, struct ksem *ks,
struct label *shmlabel, uid_t uid, gid_t gid)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmlabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred,
struct ksem *ks, struct label *kslabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(kslabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static void
mls_posixsem_create(struct ucred *cred, struct ksem *ks,
struct label *kslabel)
{
struct mac_mls *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(kslabel);
mls_copy_effective(source, dest);
}
static int
mls_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd,
struct label *shmlabel, int prot, int flags)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmlabel);
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
if (!mls_dominate_effective(subj, obj))
return (EACCES);
}
if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
if (!mls_dominate_effective(obj, subj))
return (EACCES);
}
return (0);
}
static int
mls_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
struct label *shmlabel, accmode_t accmode)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmlabel);
if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
if (!mls_dominate_effective(subj, obj))
return (EACCES);
}
if (accmode & VMODIFY_PERMS) {
if (!mls_dominate_effective(obj, subj))
return (EACCES);
}
return (0);
}
static int
mls_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
struct shmfd *shm, struct label *shmlabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(shmlabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd,
struct label *shmlabel, mode_t mode)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmlabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd,
struct label *shmlabel, uid_t uid, gid_t gid)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmlabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
struct shmfd *shmfd, struct label *shmlabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(shmlabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_posixshm_check_truncate(struct ucred *active_cred,
struct ucred *file_cred, struct shmfd *shmfd, struct label *shmlabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(shmlabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd,
struct label *shmlabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmlabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
struct shmfd *shm, struct label *shmlabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(shmlabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static void
mls_posixshm_create(struct ucred *cred, struct shmfd *shmfd,
struct label *shmlabel)
{
struct mac_mls *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(shmlabel);
mls_copy_effective(source, dest);
}
static int
mls_proc_check_debug(struct ucred *cred, struct proc *p)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!mls_dominate_effective(subj, obj))
return (ESRCH);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_proc_check_sched(struct ucred *cred, struct proc *p)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!mls_dominate_effective(subj, obj))
return (ESRCH);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!mls_dominate_effective(subj, obj))
return (ESRCH);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_socket_check_deliver(struct socket *so, struct label *solabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *p, *s;
int error;
if (!mls_enabled)
return (0);
p = SLOT(mlabel);
s = SLOT(solabel);
SOCK_LOCK(so);
error = mls_equal_effective(p, s) ? 0 : EACCES;
SOCK_UNLOCK(so);
return (error);
}
static int
mls_socket_check_relabel(struct ucred *cred, struct socket *so,
struct label *solabel, struct label *newlabel)
{
struct mac_mls *subj, *obj, *new;
int error;
SOCK_LOCK_ASSERT(so);
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
obj = SLOT(solabel);
/*
* If there is an MLS label update for the socket, it may be an
* update of effective.
*/
error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To relabel a socket, the old socket effective must be in the
* subject range.
*/
if (!mls_effective_in_range(obj, subj))
return (EPERM);
/*
* If the MLS label is to be changed, authorize as appropriate.
*/
if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
/*
* To relabel a socket, the new socket effective must be in
* the subject range.
*/
if (!mls_effective_in_range(new, subj))
return (EPERM);
/*
* To change the MLS label on the socket to contain EQUAL,
* the subject must have appropriate privilege.
*/
if (mls_contains_equal(new)) {
error = mls_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mls_socket_check_visible(struct ucred *cred, struct socket *so,
struct label *solabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(solabel);
SOCK_LOCK(so);
if (!mls_dominate_effective(subj, obj)) {
SOCK_UNLOCK(so);
return (ENOENT);
}
SOCK_UNLOCK(so);
return (0);
}
static void
mls_socket_create(struct ucred *cred, struct socket *so,
struct label *solabel)
{
struct mac_mls *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(solabel);
mls_copy_effective(source, dest);
}
static void
mls_socket_create_mbuf(struct socket *so, struct label *solabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_mls *source, *dest;
source = SLOT(solabel);
dest = SLOT(mlabel);
SOCK_LOCK(so);
mls_copy_effective(source, dest);
SOCK_UNLOCK(so);
}
static void
mls_socket_newconn(struct socket *oldso, struct label *oldsolabel,
struct socket *newso, struct label *newsolabel)
{
struct mac_mls source, *dest;
SOCK_LOCK(oldso);
source = *SLOT(oldsolabel);
SOCK_UNLOCK(oldso);
dest = SLOT(newsolabel);
SOCK_LOCK(newso);
mls_copy_effective(&source, dest);
SOCK_UNLOCK(newso);
}
static void
mls_socket_relabel(struct ucred *cred, struct socket *so,
struct label *solabel, struct label *newlabel)
{
struct mac_mls *source, *dest;
SOCK_LOCK_ASSERT(so);
source = SLOT(newlabel);
dest = SLOT(solabel);
mls_copy(source, dest);
}
static void
mls_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
struct socket *so, struct label *sopeerlabel)
{
struct mac_mls *source, *dest;
source = SLOT(mlabel);
dest = SLOT(sopeerlabel);
SOCK_LOCK(so);
mls_copy_effective(source, dest);
SOCK_UNLOCK(so);
}
static void
mls_socketpeer_set_from_socket(struct socket *oldso,
struct label *oldsolabel, struct socket *newso,
struct label *newsopeerlabel)
{
struct mac_mls source, *dest;
SOCK_LOCK(oldso);
source = *SLOT(oldsolabel);
SOCK_UNLOCK(oldso);
dest = SLOT(newsopeerlabel);
SOCK_LOCK(newso);
mls_copy_effective(&source, dest);
SOCK_UNLOCK(newso);
}
static void
mls_syncache_create(struct label *label, struct inpcb *inp)
{
struct mac_mls *source, *dest;
source = SLOT(inp->inp_label);
dest = SLOT(label);
mls_copy_effective(source, dest);
}
static void
mls_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
struct label *mlabel)
{
struct mac_mls *source, *dest;
source = SLOT(sc_label);
dest = SLOT(mlabel);
mls_copy_effective(source, dest);
}
static int
mls_system_check_acct(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
if (vplabel == NULL)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj) ||
!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_system_check_auditctl(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj) ||
!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_system_check_swapon(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj) ||
!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static void
mls_sysvmsg_cleanup(struct label *msglabel)
{
bzero(SLOT(msglabel), sizeof(struct mac_mls));
}
static void
mls_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
{
struct mac_mls *source, *dest;
/* Ignore the msgq label. */
source = SLOT(cred->cr_label);
dest = SLOT(msglabel);
mls_copy_effective(source, dest);
}
static int
mls_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr,
struct label *msglabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msglabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr,
struct label *msglabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msglabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel, int cmd)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
if (!mls_dominate_effective(obj, subj))
return (EACCES);
break;
case IPC_STAT:
if (!mls_dominate_effective(subj, obj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static void
mls_sysvmsq_cleanup(struct label *msqlabel)
{
bzero(SLOT(msqlabel), sizeof(struct mac_mls));
}
static void
mls_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqlabel)
{
struct mac_mls *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(msqlabel);
mls_copy_effective(source, dest);
}
static int
mls_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel, int cmd)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
case SETVAL:
case SETALL:
if (!mls_dominate_effective(obj, subj))
return (EACCES);
break;
case IPC_STAT:
case GETVAL:
case GETPID:
case GETNCNT:
case GETZCNT:
case GETALL:
if (!mls_dominate_effective(subj, obj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
mls_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel, size_t accesstype)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
if( accesstype & SEM_R )
if (!mls_dominate_effective(subj, obj))
return (EACCES);
if( accesstype & SEM_A )
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static void
mls_sysvsem_cleanup(struct label *semalabel)
{
bzero(SLOT(semalabel), sizeof(struct mac_mls));
}
static void
mls_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semalabel)
{
struct mac_mls *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(semalabel);
mls_copy_effective(source, dest);
}
static int
mls_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int shmflg)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
if ((shmflg & SHM_RDONLY) == 0) {
if (!mls_dominate_effective(obj, subj))
return (EACCES);
}
return (0);
}
static int
mls_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int cmd)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
if (!mls_dominate_effective(obj, subj))
return (EACCES);
break;
case IPC_STAT:
case SHM_STAT:
if (!mls_dominate_effective(subj, obj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
mls_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int shmflg)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static void
mls_sysvshm_cleanup(struct label *shmlabel)
{
bzero(SLOT(shmlabel), sizeof(struct mac_mls));
}
static void
mls_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmlabel)
{
struct mac_mls *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(shmlabel);
mls_copy_effective(source, dest);
}
static int
mls_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
struct vnode *vp, struct label *vplabel)
{
struct mac_mls mm_temp, *source, *dest;
int buflen, error;
source = SLOT(mplabel);
dest = SLOT(vplabel);
buflen = sizeof(mm_temp);
bzero(&mm_temp, buflen);
error = vn_extattr_get(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
MAC_MLS_EXTATTR_NAME, &buflen, (char *) &mm_temp, curthread);
if (error == ENOATTR || error == EOPNOTSUPP) {
/* Fall back to the mntlabel. */
mls_copy_effective(source, dest);
return (0);
} else if (error)
return (error);
if (buflen != sizeof(mm_temp)) {
printf("mls_vnode_associate_extattr: bad size %d\n", buflen);
return (EPERM);
}
if (mls_valid(&mm_temp) != 0) {
printf("mls_vnode_associate_extattr: invalid\n");
return (EPERM);
}
if ((mm_temp.mm_flags & MAC_MLS_FLAGS_BOTH) !=
MAC_MLS_FLAG_EFFECTIVE) {
printf("mls_associated_vnode_extattr: not effective\n");
return (EPERM);
}
mls_copy_effective(&mm_temp, dest);
return (0);
}
static void
mls_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
struct vnode *vp, struct label *vplabel)
{
struct mac_mls *source, *dest;
source = SLOT(mplabel);
dest = SLOT(vplabel);
mls_copy_effective(source, dest);
}
static int
mls_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_create(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_exec(struct ucred *cred, struct vnode *vp,
struct label *vplabel, 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 (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_link(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct componentname *cnp)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int prot, int flags)
{
struct mac_mls *subj, *obj;
/*
* Rely on the use of open()-time protections to handle
* non-revocation cases.
*/
if (!mls_enabled || !revocation_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
if (!mls_dominate_effective(subj, obj))
return (EACCES);
}
if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
if (!mls_dominate_effective(obj, subj))
return (EACCES);
}
return (0);
}
static int
mls_vnode_check_open(struct ucred *cred, struct vnode *vp,
struct label *vplabel, accmode_t accmode)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
/* XXX privilege override for admin? */
if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
if (!mls_dominate_effective(subj, obj))
return (EACCES);
}
if (accmode & VMODIFY_PERMS) {
if (!mls_dominate_effective(obj, subj))
return (EACCES);
}
return (0);
}
static int
mls_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_readlink(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *newlabel)
{
struct mac_mls *old, *new, *subj;
int error;
old = SLOT(vplabel);
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
/*
* If there is an MLS label update for the vnode, it must be a
* effective label.
*/
error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To perform a relabel of the vnode (MLS label or not), MLS must
* authorize the relabel.
*/
if (!mls_effective_in_range(old, subj))
return (EPERM);
/*
* If the MLS label is to be changed, authorize as appropriate.
*/
if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
/*
* To change the MLS label on a vnode, the new vnode label
* must be in the subject range.
*/
if (!mls_effective_in_range(new, subj))
return (EPERM);
/*
* To change the MLS label on the vnode to be EQUAL, the
* subject must have appropriate privilege.
*/
if (mls_contains_equal(new)) {
error = mls_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mls_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
int samedir, struct componentname *cnp)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
if (vp != NULL) {
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
}
return (0);
}
static int
mls_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type, struct acl *acl)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
/* XXX: protect the MAC EA in a special way? */
return (0);
}
static int
mls_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
struct label *vplabel, u_long flags)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
struct label *vplabel, mode_t mode)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
struct label *vplabel, uid_t uid, gid_t gid)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct timespec atime, struct timespec mtime)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_mls *subj, *obj;
if (!mls_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_mls *subj, *obj;
if (!mls_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!mls_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mls_vnode_create_extattr(struct ucred *cred, struct mount *mp,
struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
struct vnode *vp, struct label *vplabel, struct componentname *cnp)
{
struct mac_mls *source, *dest, mm_temp;
size_t buflen;
int error;
buflen = sizeof(mm_temp);
bzero(&mm_temp, buflen);
source = SLOT(cred->cr_label);
dest = SLOT(vplabel);
mls_copy_effective(source, &mm_temp);
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread);
if (error == 0)
mls_copy_effective(source, dest);
return (error);
}
static void
mls_vnode_relabel(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *label)
{
struct mac_mls *source, *dest;
source = SLOT(label);
dest = SLOT(vplabel);
mls_copy(source, dest);
}
static int
mls_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *intlabel)
{
struct mac_mls *source, mm_temp;
size_t buflen;
int error;
buflen = sizeof(mm_temp);
bzero(&mm_temp, buflen);
source = SLOT(intlabel);
if ((source->mm_flags & MAC_MLS_FLAG_EFFECTIVE) == 0)
return (0);
mls_copy_effective(source, &mm_temp);
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread);
return (error);
}
static struct mac_policy_ops mls_ops =
{
.mpo_init = mls_init,
.mpo_bpfdesc_check_receive = mls_bpfdesc_check_receive,
.mpo_bpfdesc_create = mls_bpfdesc_create,
.mpo_bpfdesc_create_mbuf = mls_bpfdesc_create_mbuf,
.mpo_bpfdesc_destroy_label = mls_destroy_label,
.mpo_bpfdesc_init_label = mls_init_label,
.mpo_cred_associate_nfsd = mls_cred_associate_nfsd,
.mpo_cred_check_relabel = mls_cred_check_relabel,
.mpo_cred_check_visible = mls_cred_check_visible,
.mpo_cred_copy_label = mls_copy_label,
.mpo_cred_create_init = mls_cred_create_init,
.mpo_cred_create_swapper = mls_cred_create_swapper,
.mpo_cred_destroy_label = mls_destroy_label,
.mpo_cred_externalize_label = mls_externalize_label,
.mpo_cred_init_label = mls_init_label,
.mpo_cred_internalize_label = mls_internalize_label,
.mpo_cred_relabel = mls_cred_relabel,
.mpo_devfs_create_device = mls_devfs_create_device,
.mpo_devfs_create_directory = mls_devfs_create_directory,
.mpo_devfs_create_symlink = mls_devfs_create_symlink,
.mpo_devfs_destroy_label = mls_destroy_label,
.mpo_devfs_init_label = mls_init_label,
.mpo_devfs_update = mls_devfs_update,
.mpo_devfs_vnode_associate = mls_devfs_vnode_associate,
.mpo_ifnet_check_relabel = mls_ifnet_check_relabel,
.mpo_ifnet_check_transmit = mls_ifnet_check_transmit,
.mpo_ifnet_copy_label = mls_copy_label,
.mpo_ifnet_create = mls_ifnet_create,
.mpo_ifnet_create_mbuf = mls_ifnet_create_mbuf,
.mpo_ifnet_destroy_label = mls_destroy_label,
.mpo_ifnet_externalize_label = mls_externalize_label,
.mpo_ifnet_init_label = mls_init_label,
.mpo_ifnet_internalize_label = mls_internalize_label,
.mpo_ifnet_relabel = mls_ifnet_relabel,
.mpo_inpcb_check_deliver = mls_inpcb_check_deliver,
.mpo_inpcb_check_visible = mls_inpcb_check_visible,
.mpo_inpcb_create = mls_inpcb_create,
.mpo_inpcb_create_mbuf = mls_inpcb_create_mbuf,
.mpo_inpcb_destroy_label = mls_destroy_label,
.mpo_inpcb_init_label = mls_init_label_waitcheck,
.mpo_inpcb_sosetlabel = mls_inpcb_sosetlabel,
.mpo_ip6q_create = mls_ip6q_create,
.mpo_ip6q_destroy_label = mls_destroy_label,
.mpo_ip6q_init_label = mls_init_label_waitcheck,
.mpo_ip6q_match = mls_ip6q_match,
.mpo_ip6q_reassemble = mls_ip6q_reassemble,
.mpo_ip6q_update = mls_ip6q_update,
.mpo_ipq_create = mls_ipq_create,
.mpo_ipq_destroy_label = mls_destroy_label,
.mpo_ipq_init_label = mls_init_label_waitcheck,
.mpo_ipq_match = mls_ipq_match,
.mpo_ipq_reassemble = mls_ipq_reassemble,
.mpo_ipq_update = mls_ipq_update,
.mpo_mbuf_copy_label = mls_copy_label,
.mpo_mbuf_destroy_label = mls_destroy_label,
.mpo_mbuf_init_label = mls_init_label_waitcheck,
.mpo_mount_check_stat = mls_mount_check_stat,
.mpo_mount_create = mls_mount_create,
.mpo_mount_destroy_label = mls_destroy_label,
.mpo_mount_init_label = mls_init_label,
.mpo_netatalk_aarp_send = mls_netatalk_aarp_send,
.mpo_netinet_arp_send = mls_netinet_arp_send,
.mpo_netinet_firewall_reply = mls_netinet_firewall_reply,
.mpo_netinet_firewall_send = mls_netinet_firewall_send,
.mpo_netinet_fragment = mls_netinet_fragment,
.mpo_netinet_icmp_reply = mls_netinet_icmp_reply,
.mpo_netinet_igmp_send = mls_netinet_igmp_send,
.mpo_netinet6_nd6_send = mls_netinet6_nd6_send,
.mpo_pipe_check_ioctl = mls_pipe_check_ioctl,
.mpo_pipe_check_poll = mls_pipe_check_poll,
.mpo_pipe_check_read = mls_pipe_check_read,
.mpo_pipe_check_relabel = mls_pipe_check_relabel,
.mpo_pipe_check_stat = mls_pipe_check_stat,
.mpo_pipe_check_write = mls_pipe_check_write,
.mpo_pipe_copy_label = mls_copy_label,
.mpo_pipe_create = mls_pipe_create,
.mpo_pipe_destroy_label = mls_destroy_label,
.mpo_pipe_externalize_label = mls_externalize_label,
.mpo_pipe_init_label = mls_init_label,
.mpo_pipe_internalize_label = mls_internalize_label,
.mpo_pipe_relabel = mls_pipe_relabel,
.mpo_posixsem_check_getvalue = mls_posixsem_check_rdonly,
.mpo_posixsem_check_open = mls_posixsem_check_openunlink,
.mpo_posixsem_check_post = mls_posixsem_check_write,
.mpo_posixsem_check_setmode = mls_posixsem_check_setmode,
.mpo_posixsem_check_setowner = mls_posixsem_check_setowner,
.mpo_posixsem_check_stat = mls_posixsem_check_rdonly,
.mpo_posixsem_check_unlink = mls_posixsem_check_openunlink,
.mpo_posixsem_check_wait = mls_posixsem_check_write,
.mpo_posixsem_create = mls_posixsem_create,
.mpo_posixsem_destroy_label = mls_destroy_label,
.mpo_posixsem_init_label = mls_init_label,
.mpo_posixshm_check_mmap = mls_posixshm_check_mmap,
.mpo_posixshm_check_open = mls_posixshm_check_open,
.mpo_posixshm_check_read = mls_posixshm_check_read,
.mpo_posixshm_check_setmode = mls_posixshm_check_setmode,
.mpo_posixshm_check_setowner = mls_posixshm_check_setowner,
.mpo_posixshm_check_stat = mls_posixshm_check_stat,
.mpo_posixshm_check_truncate = mls_posixshm_check_truncate,
.mpo_posixshm_check_unlink = mls_posixshm_check_unlink,
.mpo_posixshm_check_write = mls_posixshm_check_write,
.mpo_posixshm_create = mls_posixshm_create,
.mpo_posixshm_destroy_label = mls_destroy_label,
.mpo_posixshm_init_label = mls_init_label,
.mpo_proc_check_debug = mls_proc_check_debug,
.mpo_proc_check_sched = mls_proc_check_sched,
.mpo_proc_check_signal = mls_proc_check_signal,
.mpo_socket_check_deliver = mls_socket_check_deliver,
.mpo_socket_check_relabel = mls_socket_check_relabel,
.mpo_socket_check_visible = mls_socket_check_visible,
.mpo_socket_copy_label = mls_copy_label,
.mpo_socket_create = mls_socket_create,
.mpo_socket_create_mbuf = mls_socket_create_mbuf,
.mpo_socket_destroy_label = mls_destroy_label,
.mpo_socket_externalize_label = mls_externalize_label,
.mpo_socket_init_label = mls_init_label_waitcheck,
.mpo_socket_internalize_label = mls_internalize_label,
.mpo_socket_newconn = mls_socket_newconn,
.mpo_socket_relabel = mls_socket_relabel,
.mpo_socketpeer_destroy_label = mls_destroy_label,
.mpo_socketpeer_externalize_label = mls_externalize_label,
.mpo_socketpeer_init_label = mls_init_label_waitcheck,
.mpo_socketpeer_set_from_mbuf = mls_socketpeer_set_from_mbuf,
.mpo_socketpeer_set_from_socket = mls_socketpeer_set_from_socket,
.mpo_syncache_create = mls_syncache_create,
.mpo_syncache_create_mbuf = mls_syncache_create_mbuf,
.mpo_syncache_destroy_label = mls_destroy_label,
.mpo_syncache_init_label = mls_init_label_waitcheck,
.mpo_sysvmsg_cleanup = mls_sysvmsg_cleanup,
.mpo_sysvmsg_create = mls_sysvmsg_create,
.mpo_sysvmsg_destroy_label = mls_destroy_label,
.mpo_sysvmsg_init_label = mls_init_label,
.mpo_sysvmsq_check_msgrcv = mls_sysvmsq_check_msgrcv,
.mpo_sysvmsq_check_msgrmid = mls_sysvmsq_check_msgrmid,
.mpo_sysvmsq_check_msqget = mls_sysvmsq_check_msqget,
.mpo_sysvmsq_check_msqsnd = mls_sysvmsq_check_msqsnd,
.mpo_sysvmsq_check_msqrcv = mls_sysvmsq_check_msqrcv,
.mpo_sysvmsq_check_msqctl = mls_sysvmsq_check_msqctl,
.mpo_sysvmsq_cleanup = mls_sysvmsq_cleanup,
.mpo_sysvmsq_destroy_label = mls_destroy_label,
.mpo_sysvmsq_init_label = mls_init_label,
.mpo_sysvmsq_create = mls_sysvmsq_create,
.mpo_sysvsem_check_semctl = mls_sysvsem_check_semctl,
.mpo_sysvsem_check_semget = mls_sysvsem_check_semget,
.mpo_sysvsem_check_semop = mls_sysvsem_check_semop,
.mpo_sysvsem_cleanup = mls_sysvsem_cleanup,
.mpo_sysvsem_create = mls_sysvsem_create,
.mpo_sysvsem_destroy_label = mls_destroy_label,
.mpo_sysvsem_init_label = mls_init_label,
.mpo_sysvshm_check_shmat = mls_sysvshm_check_shmat,
.mpo_sysvshm_check_shmctl = mls_sysvshm_check_shmctl,
.mpo_sysvshm_check_shmget = mls_sysvshm_check_shmget,
.mpo_sysvshm_cleanup = mls_sysvshm_cleanup,
.mpo_sysvshm_create = mls_sysvshm_create,
.mpo_sysvshm_destroy_label = mls_destroy_label,
.mpo_sysvshm_init_label = mls_init_label,
.mpo_system_check_acct = mls_system_check_acct,
.mpo_system_check_auditctl = mls_system_check_auditctl,
.mpo_system_check_swapon = mls_system_check_swapon,
.mpo_vnode_associate_extattr = mls_vnode_associate_extattr,
.mpo_vnode_associate_singlelabel = mls_vnode_associate_singlelabel,
.mpo_vnode_check_access = mls_vnode_check_open,
.mpo_vnode_check_chdir = mls_vnode_check_chdir,
.mpo_vnode_check_chroot = mls_vnode_check_chroot,
.mpo_vnode_check_create = mls_vnode_check_create,
.mpo_vnode_check_deleteacl = mls_vnode_check_deleteacl,
.mpo_vnode_check_deleteextattr = mls_vnode_check_deleteextattr,
.mpo_vnode_check_exec = mls_vnode_check_exec,
.mpo_vnode_check_getacl = mls_vnode_check_getacl,
.mpo_vnode_check_getextattr = mls_vnode_check_getextattr,
.mpo_vnode_check_link = mls_vnode_check_link,
.mpo_vnode_check_listextattr = mls_vnode_check_listextattr,
.mpo_vnode_check_lookup = mls_vnode_check_lookup,
.mpo_vnode_check_mmap = mls_vnode_check_mmap,
.mpo_vnode_check_open = mls_vnode_check_open,
.mpo_vnode_check_poll = mls_vnode_check_poll,
.mpo_vnode_check_read = mls_vnode_check_read,
.mpo_vnode_check_readdir = mls_vnode_check_readdir,
.mpo_vnode_check_readlink = mls_vnode_check_readlink,
.mpo_vnode_check_relabel = mls_vnode_check_relabel,
.mpo_vnode_check_rename_from = mls_vnode_check_rename_from,
.mpo_vnode_check_rename_to = mls_vnode_check_rename_to,
.mpo_vnode_check_revoke = mls_vnode_check_revoke,
.mpo_vnode_check_setacl = mls_vnode_check_setacl,
.mpo_vnode_check_setextattr = mls_vnode_check_setextattr,
.mpo_vnode_check_setflags = mls_vnode_check_setflags,
.mpo_vnode_check_setmode = mls_vnode_check_setmode,
.mpo_vnode_check_setowner = mls_vnode_check_setowner,
.mpo_vnode_check_setutimes = mls_vnode_check_setutimes,
.mpo_vnode_check_stat = mls_vnode_check_stat,
.mpo_vnode_check_unlink = mls_vnode_check_unlink,
.mpo_vnode_check_write = mls_vnode_check_write,
.mpo_vnode_copy_label = mls_copy_label,
.mpo_vnode_create_extattr = mls_vnode_create_extattr,
.mpo_vnode_destroy_label = mls_destroy_label,
.mpo_vnode_externalize_label = mls_externalize_label,
.mpo_vnode_init_label = mls_init_label,
.mpo_vnode_internalize_label = mls_internalize_label,
.mpo_vnode_relabel = mls_vnode_relabel,
.mpo_vnode_setlabel_extattr = mls_vnode_setlabel_extattr,
};
MAC_POLICY_SET(&mls_ops, mac_mls, "TrustedBSD MAC/MLS",
MPC_LOADTIME_FLAG_NOTLATE, &mls_slot);
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