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freebsd-nq/sys/security/mac_biba/mac_biba.c
Edward Tomasz Napierala 6180d3185d Get rid of VSTAT and replace it with VSTAT_PERMS, which is somewhat 
better defined.

Approved by:	rwatson (mentor)
2009-03-29 17:45:48 +00:00

3548 lines
78 KiB
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/*-
* Copyright (c) 1999-2002, 2007-2008 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").
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Developed by the TrustedBSD Project.
*
* Biba fixed label mandatory integrity policy.
*/
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/extattr.h>
#include <sys/kernel.h>
#include <sys/ksem.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/priv.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_biba/mac_biba.h>
SYSCTL_DECL(_security_mac);
SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0,
"TrustedBSD mac_biba policy controls");
static int biba_label_size = sizeof(struct mac_biba);
SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD,
&biba_label_size, 0, "Size of struct mac_biba");
static int biba_enabled = 1;
SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW, &biba_enabled,
0, "Enforce MAC/Biba policy");
TUNABLE_INT("security.mac.biba.enabled", &biba_enabled);
static int destroyed_not_inited;
SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
&destroyed_not_inited, 0, "Count of labels destroyed but not inited");
static int trust_all_interfaces = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
&trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba");
TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces);
static char trusted_interfaces[128];
SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba");
TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces,
sizeof(trusted_interfaces));
static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS;
SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD,
&max_compartments, 0, "Maximum supported compartments");
static int ptys_equal = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW, &ptys_equal,
0, "Label pty devices as biba/equal on create");
TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal);
static int interfaces_equal;
SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RW,
&interfaces_equal, 0, "Label network interfaces as biba/equal on create");
TUNABLE_INT("security.mac.biba.interfaces_equal", &interfaces_equal);
static int revocation_enabled = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW,
&revocation_enabled, 0, "Revoke access to objects on relabel");
TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled);
static int biba_slot;
#define SLOT(l) ((struct mac_biba *)mac_label_get((l), biba_slot))
#define SLOT_SET(l, val) mac_label_set((l), biba_slot, (uintptr_t)(val))
static uma_zone_t zone_biba;
static __inline int
biba_bit_set_empty(u_char *set) {
int i;
for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++)
if (set[i] != 0)
return (0);
return (1);
}
static struct mac_biba *
biba_alloc(int flag)
{
return (uma_zalloc(zone_biba, flag | M_ZERO));
}
static void
biba_free(struct mac_biba *mb)
{
if (mb != NULL)
uma_zfree(zone_biba, mb);
else
atomic_add_int(&destroyed_not_inited, 1);
}
static int
biba_atmostflags(struct mac_biba *mb, int flags)
{
if ((mb->mb_flags & flags) != mb->mb_flags)
return (EINVAL);
return (0);
}
static int
biba_dominate_element(struct mac_biba_element *a, struct mac_biba_element *b)
{
int bit;
switch (a->mbe_type) {
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
return (1);
case MAC_BIBA_TYPE_LOW:
switch (b->mbe_type) {
case MAC_BIBA_TYPE_GRADE:
case MAC_BIBA_TYPE_HIGH:
return (0);
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_LOW:
return (1);
default:
panic("biba_dominate_element: b->mbe_type invalid");
}
case MAC_BIBA_TYPE_GRADE:
switch (b->mbe_type) {
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_LOW:
return (1);
case MAC_BIBA_TYPE_HIGH:
return (0);
case MAC_BIBA_TYPE_GRADE:
for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++)
if (!MAC_BIBA_BIT_TEST(bit,
a->mbe_compartments) &&
MAC_BIBA_BIT_TEST(bit, b->mbe_compartments))
return (0);
return (a->mbe_grade >= b->mbe_grade);
default:
panic("biba_dominate_element: b->mbe_type invalid");
}
default:
panic("biba_dominate_element: a->mbe_type invalid");
}
return (0);
}
static int
biba_subject_dominate_high(struct mac_biba *mb)
{
struct mac_biba_element *element;
KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("biba_effective_in_range: mb not effective"));
element = &mb->mb_effective;
return (element->mbe_type == MAC_BIBA_TYPE_EQUAL ||
element->mbe_type == MAC_BIBA_TYPE_HIGH);
}
static int
biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb)
{
return (biba_dominate_element(&rangeb->mb_rangehigh,
&rangea->mb_rangehigh) &&
biba_dominate_element(&rangea->mb_rangelow,
&rangeb->mb_rangelow));
}
static int
biba_effective_in_range(struct mac_biba *effective, struct mac_biba *range)
{
KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("biba_effective_in_range: a not effective"));
KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
("biba_effective_in_range: b not range"));
return (biba_dominate_element(&range->mb_rangehigh,
&effective->mb_effective) &&
biba_dominate_element(&effective->mb_effective,
&range->mb_rangelow));
return (1);
}
static int
biba_dominate_effective(struct mac_biba *a, struct mac_biba *b)
{
KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("biba_dominate_effective: a not effective"));
KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("biba_dominate_effective: b not effective"));
return (biba_dominate_element(&a->mb_effective, &b->mb_effective));
}
static int
biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b)
{
if (a->mbe_type == MAC_BIBA_TYPE_EQUAL ||
b->mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade);
}
static int
biba_equal_effective(struct mac_biba *a, struct mac_biba *b)
{
KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("biba_equal_effective: a not effective"));
KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("biba_equal_effective: b not effective"));
return (biba_equal_element(&a->mb_effective, &b->mb_effective));
}
static int
biba_contains_equal(struct mac_biba *mb)
{
if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
}
if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
if (mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
}
return (0);
}
static int
biba_subject_privileged(struct mac_biba *mb)
{
KASSERT((mb->mb_flags & MAC_BIBA_FLAGS_BOTH) == MAC_BIBA_FLAGS_BOTH,
("biba_subject_privileged: subject doesn't have both labels"));
/* If the effective is EQUAL, it's ok. */
if (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (0);
/* If either range endpoint is EQUAL, it's ok. */
if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL ||
mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (0);
/* If the range is low-high, it's ok. */
if (mb->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW &&
mb->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH)
return (0);
/* It's not ok. */
return (EPERM);
}
static int
biba_high_effective(struct mac_biba *mb)
{
KASSERT((mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("biba_equal_effective: mb not effective"));
return (mb->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH);
}
static int
biba_valid(struct mac_biba *mb)
{
if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
switch (mb->mb_effective.mbe_type) {
case MAC_BIBA_TYPE_GRADE:
break;
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
case MAC_BIBA_TYPE_LOW:
if (mb->mb_effective.mbe_grade != 0 ||
!MAC_BIBA_BIT_SET_EMPTY(
mb->mb_effective.mbe_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
} else {
if (mb->mb_effective.mbe_type != MAC_BIBA_TYPE_UNDEF)
return (EINVAL);
}
if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
switch (mb->mb_rangelow.mbe_type) {
case MAC_BIBA_TYPE_GRADE:
break;
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
case MAC_BIBA_TYPE_LOW:
if (mb->mb_rangelow.mbe_grade != 0 ||
!MAC_BIBA_BIT_SET_EMPTY(
mb->mb_rangelow.mbe_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
switch (mb->mb_rangehigh.mbe_type) {
case MAC_BIBA_TYPE_GRADE:
break;
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
case MAC_BIBA_TYPE_LOW:
if (mb->mb_rangehigh.mbe_grade != 0 ||
!MAC_BIBA_BIT_SET_EMPTY(
mb->mb_rangehigh.mbe_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
if (!biba_dominate_element(&mb->mb_rangehigh,
&mb->mb_rangelow))
return (EINVAL);
} else {
if (mb->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF ||
mb->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF)
return (EINVAL);
}
return (0);
}
static void
biba_set_range(struct mac_biba *mb, u_short typelow, u_short gradelow,
u_char *compartmentslow, u_short typehigh, u_short gradehigh,
u_char *compartmentshigh)
{
mb->mb_rangelow.mbe_type = typelow;
mb->mb_rangelow.mbe_grade = gradelow;
if (compartmentslow != NULL)
memcpy(mb->mb_rangelow.mbe_compartments, compartmentslow,
sizeof(mb->mb_rangelow.mbe_compartments));
mb->mb_rangehigh.mbe_type = typehigh;
mb->mb_rangehigh.mbe_grade = gradehigh;
if (compartmentshigh != NULL)
memcpy(mb->mb_rangehigh.mbe_compartments, compartmentshigh,
sizeof(mb->mb_rangehigh.mbe_compartments));
mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
static void
biba_set_effective(struct mac_biba *mb, u_short type, u_short grade,
u_char *compartments)
{
mb->mb_effective.mbe_type = type;
mb->mb_effective.mbe_grade = grade;
if (compartments != NULL)
memcpy(mb->mb_effective.mbe_compartments, compartments,
sizeof(mb->mb_effective.mbe_compartments));
mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
}
static void
biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto)
{
KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
("biba_copy_range: labelfrom not range"));
labelto->mb_rangelow = labelfrom->mb_rangelow;
labelto->mb_rangehigh = labelfrom->mb_rangehigh;
labelto->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
static void
biba_copy_effective(struct mac_biba *labelfrom, struct mac_biba *labelto)
{
KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("biba_copy_effective: labelfrom not effective"));
labelto->mb_effective = labelfrom->mb_effective;
labelto->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
}
static void
biba_copy(struct mac_biba *source, struct mac_biba *dest)
{
if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE)
biba_copy_effective(source, dest);
if (source->mb_flags & MAC_BIBA_FLAG_RANGE)
biba_copy_range(source, dest);
}
/*
* Policy module operations.
*/
static void
biba_init(struct mac_policy_conf *conf)
{
zone_biba = uma_zcreate("mac_biba", sizeof(struct mac_biba), NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
}
/*
* Label operations.
*/
static void
biba_init_label(struct label *label)
{
SLOT_SET(label, biba_alloc(M_WAITOK));
}
static int
biba_init_label_waitcheck(struct label *label, int flag)
{
SLOT_SET(label, biba_alloc(flag));
if (SLOT(label) == NULL)
return (ENOMEM);
return (0);
}
static void
biba_destroy_label(struct label *label)
{
biba_free(SLOT(label));
SLOT_SET(label, NULL);
}
/*
* biba_element_to_string() accepts an sbuf and Biba element. It converts
* the Biba element to a string and stores the result in the sbuf; if there
* isn't space in the sbuf, -1 is returned.
*/
static int
biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element)
{
int i, first;
switch (element->mbe_type) {
case MAC_BIBA_TYPE_HIGH:
return (sbuf_printf(sb, "high"));
case MAC_BIBA_TYPE_LOW:
return (sbuf_printf(sb, "low"));
case MAC_BIBA_TYPE_EQUAL:
return (sbuf_printf(sb, "equal"));
case MAC_BIBA_TYPE_GRADE:
if (sbuf_printf(sb, "%d", element->mbe_grade) == -1)
return (-1);
first = 1;
for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) {
if (MAC_BIBA_BIT_TEST(i, element->mbe_compartments)) {
if (first) {
if (sbuf_putc(sb, ':') == -1)
return (-1);
if (sbuf_printf(sb, "%d", i) == -1)
return (-1);
first = 0;
} else {
if (sbuf_printf(sb, "+%d", i) == -1)
return (-1);
}
}
}
return (0);
default:
panic("biba_element_to_string: invalid type (%d)",
element->mbe_type);
}
}
/*
* biba_to_string() converts a Biba label to a string, and places the results
* in the passed sbuf. It returns 0 on success, or EINVAL if there isn't
* room in the sbuf. Note: the sbuf will be modified even in a failure case,
* so the caller may need to revert the sbuf by restoring the offset if
* that's undesired.
*/
static int
biba_to_string(struct sbuf *sb, struct mac_biba *mb)
{
if (mb->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
if (biba_element_to_string(sb, &mb->mb_effective) == -1)
return (EINVAL);
}
if (mb->mb_flags & MAC_BIBA_FLAG_RANGE) {
if (sbuf_putc(sb, '(') == -1)
return (EINVAL);
if (biba_element_to_string(sb, &mb->mb_rangelow) == -1)
return (EINVAL);
if (sbuf_putc(sb, '-') == -1)
return (EINVAL);
if (biba_element_to_string(sb, &mb->mb_rangehigh) == -1)
return (EINVAL);
if (sbuf_putc(sb, ')') == -1)
return (EINVAL);
}
return (0);
}
static int
biba_externalize_label(struct label *label, char *element_name,
struct sbuf *sb, int *claimed)
{
struct mac_biba *mb;
if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
mb = SLOT(label);
return (biba_to_string(sb, mb));
}
static int
biba_parse_element(struct mac_biba_element *element, char *string)
{
char *compartment, *end, *grade;
int value;
if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
element->mbe_type = MAC_BIBA_TYPE_HIGH;
element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
} else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
element->mbe_type = MAC_BIBA_TYPE_LOW;
element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
} else if (strcmp(string, "equal") == 0 ||
strcmp(string, "eq") == 0) {
element->mbe_type = MAC_BIBA_TYPE_EQUAL;
element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
} else {
element->mbe_type = MAC_BIBA_TYPE_GRADE;
/*
* Numeric grade piece of the element.
*/
grade = strsep(&string, ":");
value = strtol(grade, &end, 10);
if (end == grade || *end != '\0')
return (EINVAL);
if (value < 0 || value > 65535)
return (EINVAL);
element->mbe_grade = value;
/*
* Optional compartment piece of the element. If none are
* included, we assume that the label has no compartments.
*/
if (string == NULL)
return (0);
if (*string == '\0')
return (0);
while ((compartment = strsep(&string, "+")) != NULL) {
value = strtol(compartment, &end, 10);
if (compartment == end || *end != '\0')
return (EINVAL);
if (value < 1 || value > MAC_BIBA_MAX_COMPARTMENTS)
return (EINVAL);
MAC_BIBA_BIT_SET(value, element->mbe_compartments);
}
}
return (0);
}
/*
* Note: destructively consumes the string, make a local copy before calling
* if that's a problem.
*/
static int
biba_parse(struct mac_biba *mb, 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),
("biba_parse: range mismatch"));
bzero(mb, sizeof(*mb));
if (effective != NULL) {
error = biba_parse_element(&mb->mb_effective, effective);
if (error)
return (error);
mb->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
}
if (rangelow != NULL) {
error = biba_parse_element(&mb->mb_rangelow, rangelow);
if (error)
return (error);
error = biba_parse_element(&mb->mb_rangehigh, rangehigh);
if (error)
return (error);
mb->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
error = biba_valid(mb);
if (error)
return (error);
return (0);
}
static int
biba_internalize_label(struct label *label, char *element_name,
char *element_data, int *claimed)
{
struct mac_biba *mb, mb_temp;
int error;
if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
error = biba_parse(&mb_temp, element_data);
if (error)
return (error);
mb = SLOT(label);
*mb = mb_temp;
return (0);
}
static void
biba_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
biba_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
struct ifnet *ifp, struct label *ifplabel)
{
struct mac_biba *a, *b;
if (!biba_enabled)
return (0);
a = SLOT(dlabel);
b = SLOT(ifplabel);
if (biba_equal_effective(a, b))
return (0);
return (EACCES);
}
static void
biba_bpfdesc_create(struct ucred *cred, struct bpf_d *d,
struct label *dlabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(dlabel);
biba_copy_effective(source, dest);
}
static void
biba_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(dlabel);
dest = SLOT(mlabel);
biba_copy_effective(source, dest);
}
static void
biba_cred_associate_nfsd(struct ucred *cred)
{
struct mac_biba *label;
label = SLOT(cred->cr_label);
biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL);
biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
0, NULL);
}
static int
biba_cred_check_relabel(struct ucred *cred, struct label *newlabel)
{
struct mac_biba *subj, *new;
int error;
subj = SLOT(cred->cr_label);
new = SLOT(newlabel);
/*
* If there is a Biba label update for the credential, it may
* be an update of the effective, range, or both.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
if (error)
return (error);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) {
/*
* If the change request modifies both the Biba label
* effective and range, check that the new effective will be
* in the new range.
*/
if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
MAC_BIBA_FLAGS_BOTH &&
!biba_effective_in_range(new, new))
return (EINVAL);
/*
* To change the Biba effective label on a credential, the
* new effective label must be in the current range.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE &&
!biba_effective_in_range(new, subj))
return (EPERM);
/*
* To change the Biba range on a credential, the new range
* label must be in the current range.
*/
if (new->mb_flags & MAC_BIBA_FLAG_RANGE &&
!biba_range_in_range(new, subj))
return (EPERM);
/*
* To have EQUAL in any component of the new credential Biba
* label, the subject must already have EQUAL in their label.
*/
if (biba_contains_equal(new)) {
error = biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
biba_cred_check_visible(struct ucred *u1, struct ucred *u2)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(u1->cr_label);
obj = SLOT(u2->cr_label);
/* XXX: range */
if (!biba_dominate_effective(obj, subj))
return (ESRCH);
return (0);
}
static void
biba_cred_create_init(struct ucred *cred)
{
struct mac_biba *dest;
dest = SLOT(cred->cr_label);
biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL);
biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
0, NULL);
}
static void
biba_cred_create_swapper(struct ucred *cred)
{
struct mac_biba *dest;
dest = SLOT(cred->cr_label);
biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL, MAC_BIBA_TYPE_HIGH,
0, NULL);
}
static void
biba_cred_relabel(struct ucred *cred, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(cred->cr_label);
biba_copy(source, dest);
}
static void
biba_devfs_create_device(struct ucred *cred, struct mount *mp,
struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
{
struct mac_biba *mb;
int biba_type;
mb = SLOT(delabel);
if (strcmp(dev->si_name, "null") == 0 ||
strcmp(dev->si_name, "zero") == 0 ||
strcmp(dev->si_name, "random") == 0 ||
strncmp(dev->si_name, "fd/", strlen("fd/")) == 0)
biba_type = MAC_BIBA_TYPE_EQUAL;
else if (ptys_equal &&
(strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
biba_type = MAC_BIBA_TYPE_EQUAL;
else
biba_type = MAC_BIBA_TYPE_HIGH;
biba_set_effective(mb, biba_type, 0, NULL);
}
static void
biba_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
struct devfs_dirent *de, struct label *delabel)
{
struct mac_biba *mb;
mb = SLOT(delabel);
biba_set_effective(mb, MAC_BIBA_TYPE_HIGH, 0, NULL);
}
static void
biba_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_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(delabel);
biba_copy_effective(source, dest);
}
static void
biba_devfs_update(struct mount *mp, struct devfs_dirent *de,
struct label *delabel, struct vnode *vp, struct label *vplabel)
{
struct mac_biba *source, *dest;
source = SLOT(vplabel);
dest = SLOT(delabel);
biba_copy(source, dest);
}
static void
biba_devfs_vnode_associate(struct mount *mp, struct label *mntlabel,
struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *source, *dest;
source = SLOT(delabel);
dest = SLOT(vplabel);
biba_copy_effective(source, dest);
}
static int
biba_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
struct label *ifplabel, struct label *newlabel)
{
struct mac_biba *subj, *new;
int error;
subj = SLOT(cred->cr_label);
new = SLOT(newlabel);
/*
* If there is a Biba label update for the interface, it may be an
* update of the effective, range, or both.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
if (error)
return (error);
/*
* Relabling network interfaces requires Biba privilege.
*/
error = biba_subject_privileged(subj);
if (error)
return (error);
return (0);
}
static int
biba_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *p, *i;
if (!biba_enabled)
return (0);
p = SLOT(mlabel);
i = SLOT(ifplabel);
return (biba_effective_in_range(p, i) ? 0 : EACCES);
}
static void
biba_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
{
char tifname[IFNAMSIZ], *p, *q;
char tiflist[sizeof(trusted_interfaces)];
struct mac_biba *dest;
int len, type;
dest = SLOT(ifplabel);
if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) {
type = MAC_BIBA_TYPE_EQUAL;
goto set;
}
if (trust_all_interfaces) {
type = MAC_BIBA_TYPE_HIGH;
goto set;
}
type = MAC_BIBA_TYPE_LOW;
if (trusted_interfaces[0] == '\0' ||
!strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
goto set;
bzero(tiflist, sizeof(tiflist));
for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
if(*p != ' ' && *p != '\t')
*q = *p;
for (p = q = tiflist;; p++) {
if (*p == ',' || *p == '\0') {
len = p - q;
if (len < IFNAMSIZ) {
bzero(tifname, sizeof(tifname));
bcopy(q, tifname, len);
if (strcmp(tifname, ifp->if_xname) == 0) {
type = MAC_BIBA_TYPE_HIGH;
break;
}
} else {
*p = '\0';
printf("mac_biba warning: interface name "
"\"%s\" is too long (must be < %d)\n",
q, IFNAMSIZ);
}
if (*p == '\0')
break;
q = p + 1;
}
}
set:
biba_set_effective(dest, type, 0, NULL);
biba_set_range(dest, type, 0, NULL, type, 0, NULL);
}
static void
biba_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(ifplabel);
dest = SLOT(mlabel);
biba_copy_effective(source, dest);
}
static void
biba_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
struct label *ifplabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(ifplabel);
biba_copy(source, dest);
}
static int
biba_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *p, *i;
if (!biba_enabled)
return (0);
p = SLOT(mlabel);
i = SLOT(inplabel);
return (biba_equal_effective(p, i) ? 0 : EACCES);
}
static int
biba_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
struct label *inplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(inplabel);
if (!biba_dominate_effective(obj, subj))
return (ENOENT);
return (0);
}
static void
biba_inpcb_create(struct socket *so, struct label *solabel,
struct inpcb *inp, struct label *inplabel)
{
struct mac_biba *source, *dest;
source = SLOT(solabel);
dest = SLOT(inplabel);
biba_copy_effective(source, dest);
}
static void
biba_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(inplabel);
dest = SLOT(mlabel);
biba_copy_effective(source, dest);
}
static void
biba_inpcb_sosetlabel(struct socket *so, struct label *solabel,
struct inpcb *inp, struct label *inplabel)
{
struct mac_biba *source, *dest;
source = SLOT(solabel);
dest = SLOT(inplabel);
biba_copy(source, dest);
}
static void
biba_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
struct label *q6label)
{
struct mac_biba *source, *dest;
source = SLOT(mlabel);
dest = SLOT(q6label);
biba_copy_effective(source, dest);
}
static int
biba_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
struct label *q6label)
{
struct mac_biba *a, *b;
a = SLOT(q6label);
b = SLOT(mlabel);
return (biba_equal_effective(a, b));
}
static void
biba_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(q6label);
dest = SLOT(mlabel);
/* Just use the head, since we require them all to match. */
biba_copy_effective(source, dest);
}
static void
biba_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
biba_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
struct label *qlabel)
{
struct mac_biba *source, *dest;
source = SLOT(mlabel);
dest = SLOT(qlabel);
biba_copy_effective(source, dest);
}
static int
biba_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
struct label *qlabel)
{
struct mac_biba *a, *b;
a = SLOT(qlabel);
b = SLOT(mlabel);
return (biba_equal_effective(a, b));
}
static void
biba_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(qlabel);
dest = SLOT(mlabel);
/* Just use the head, since we require them all to match. */
biba_copy_effective(source, dest);
}
static void
biba_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
biba_kld_check_load(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
int error;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = biba_subject_privileged(subj);
if (error)
return (error);
obj = SLOT(vplabel);
if (!biba_high_effective(obj))
return (EACCES);
return (0);
}
static int
biba_mount_check_stat(struct ucred *cred, struct mount *mp,
struct label *mplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(mplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static void
biba_mount_create(struct ucred *cred, struct mount *mp,
struct label *mplabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(mplabel);
biba_copy_effective(source, dest);
}
static void
biba_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *dest;
dest = SLOT(mlabel);
biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
}
static void
biba_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *dest;
dest = SLOT(mlabel);
biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
}
static void
biba_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
struct mbuf *msend, struct label *msendlabel)
{
struct mac_biba *source, *dest;
source = SLOT(mrecvlabel);
dest = SLOT(msendlabel);
biba_copy_effective(source, dest);
}
static void
biba_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
{
struct mac_biba *dest;
dest = SLOT(mlabel);
/* XXX: where is the label for the firewall really coming from? */
biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
}
static void
biba_netinet_fragment(struct mbuf *m, struct label *mlabel,
struct mbuf *frag, struct label *fraglabel)
{
struct mac_biba *source, *dest;
source = SLOT(mlabel);
dest = SLOT(fraglabel);
biba_copy_effective(source, dest);
}
static void
biba_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
struct mbuf *msend, struct label *msendlabel)
{
struct mac_biba *source, *dest;
source = SLOT(mrecvlabel);
dest = SLOT(msendlabel);
biba_copy_effective(source, dest);
}
static void
biba_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *dest;
dest = SLOT(mlabel);
biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
}
static void
biba_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *dest;
dest = SLOT(mlabel);
biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
}
static int
biba_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
{
if(!biba_enabled)
return (0);
/* XXX: This will be implemented soon... */
return (0);
}
static int
biba_pipe_check_poll(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_pipe_check_read(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, struct label *newlabel)
{
struct mac_biba *subj, *obj, *new;
int error;
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
/*
* If there is a Biba label update for a pipe, it must be a effective
* update.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To perform a relabel of a pipe (Biba label or not), Biba must
* authorize the relabel.
*/
if (!biba_effective_in_range(obj, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
/*
* To change the Biba label on a pipe, the new pipe label
* must be in the subject range.
*/
if (!biba_effective_in_range(new, subj))
return (EPERM);
/*
* To change the Biba label on a pipe to be EQUAL, the
* subject must have appropriate privilege.
*/
if (biba_contains_equal(new)) {
error = biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
biba_pipe_check_stat(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_pipe_check_write(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static void
biba_pipe_create(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(pplabel);
biba_copy_effective(source, dest);
}
static void
biba_pipe_relabel(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(pplabel);
biba_copy(source, dest);
}
static int
biba_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks,
struct label *kslabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(kslabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred,
struct ksem *ks, struct label *kslabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(kslabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred,
struct ksem *ks, struct label *kslabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(kslabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static void
biba_posixsem_create(struct ucred *cred, struct ksem *ks,
struct label *kslabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(kslabel);
biba_copy_effective(source, dest);
}
/*
* Some system privileges are allowed regardless of integrity grade; others
* are allowed only when running with privilege with respect to the Biba
* policy as they might otherwise allow bypassing of the integrity policy.
*/
static int
biba_priv_check(struct ucred *cred, int priv)
{
struct mac_biba *subj;
int error;
if (!biba_enabled)
return (0);
/*
* Exempt only specific privileges from the Biba integrity policy.
*/
switch (priv) {
case PRIV_KTRACE:
case PRIV_MSGBUF:
/*
* Allow processes to manipulate basic process audit properties, and
* to submit audit records.
*/
case PRIV_AUDIT_GETAUDIT:
case PRIV_AUDIT_SETAUDIT:
case PRIV_AUDIT_SUBMIT:
/*
* Allow processes to manipulate their regular UNIX credentials.
*/
case PRIV_CRED_SETUID:
case PRIV_CRED_SETEUID:
case PRIV_CRED_SETGID:
case PRIV_CRED_SETEGID:
case PRIV_CRED_SETGROUPS:
case PRIV_CRED_SETREUID:
case PRIV_CRED_SETREGID:
case PRIV_CRED_SETRESUID:
case PRIV_CRED_SETRESGID:
/*
* Allow processes to perform system monitoring.
*/
case PRIV_SEEOTHERGIDS:
case PRIV_SEEOTHERUIDS:
break;
/*
* Allow access to general process debugging facilities. We
* separately control debugging based on MAC label.
*/
case PRIV_DEBUG_DIFFCRED:
case PRIV_DEBUG_SUGID:
case PRIV_DEBUG_UNPRIV:
/*
* Allow manipulating jails.
*/
case PRIV_JAIL_ATTACH:
/*
* Allow privilege with respect to the Partition policy, but not the
* Privs policy.
*/
case PRIV_MAC_PARTITION:
/*
* Allow privilege with respect to process resource limits and login
* context.
*/
case PRIV_PROC_LIMIT:
case PRIV_PROC_SETLOGIN:
case PRIV_PROC_SETRLIMIT:
/*
* Allow System V and POSIX IPC privileges.
*/
case PRIV_IPC_READ:
case PRIV_IPC_WRITE:
case PRIV_IPC_ADMIN:
case PRIV_IPC_MSGSIZE:
case PRIV_MQ_ADMIN:
/*
* Allow certain scheduler manipulations -- possibly this should be
* controlled by more fine-grained policy, as potentially low
* integrity processes can deny CPU to higher integrity ones.
*/
case PRIV_SCHED_DIFFCRED:
case PRIV_SCHED_SETPRIORITY:
case PRIV_SCHED_RTPRIO:
case PRIV_SCHED_SETPOLICY:
case PRIV_SCHED_SET:
case PRIV_SCHED_SETPARAM:
/*
* More IPC privileges.
*/
case PRIV_SEM_WRITE:
/*
* Allow signaling privileges subject to integrity policy.
*/
case PRIV_SIGNAL_DIFFCRED:
case PRIV_SIGNAL_SUGID:
/*
* Allow access to only limited sysctls from lower integrity levels;
* piggy-back on the Jail definition.
*/
case PRIV_SYSCTL_WRITEJAIL:
/*
* Allow TTY-based privileges, subject to general device access using
* labels on TTY device nodes, but not console privilege.
*/
case PRIV_TTY_DRAINWAIT:
case PRIV_TTY_DTRWAIT:
case PRIV_TTY_EXCLUSIVE:
case PRIV_TTY_PRISON:
case PRIV_TTY_STI:
case PRIV_TTY_SETA:
/*
* Grant most VFS privileges, as almost all are in practice bounded
* by more specific checks using labels.
*/
case PRIV_VFS_READ:
case PRIV_VFS_WRITE:
case PRIV_VFS_ADMIN:
case PRIV_VFS_EXEC:
case PRIV_VFS_LOOKUP:
case PRIV_VFS_CHFLAGS_DEV:
case PRIV_VFS_CHOWN:
case PRIV_VFS_CHROOT:
case PRIV_VFS_RETAINSUGID:
case PRIV_VFS_EXCEEDQUOTA:
case PRIV_VFS_FCHROOT:
case PRIV_VFS_FHOPEN:
case PRIV_VFS_FHSTATFS:
case PRIV_VFS_GENERATION:
case PRIV_VFS_GETFH:
case PRIV_VFS_GETQUOTA:
case PRIV_VFS_LINK:
case PRIV_VFS_MOUNT:
case PRIV_VFS_MOUNT_OWNER:
case PRIV_VFS_MOUNT_PERM:
case PRIV_VFS_MOUNT_SUIDDIR:
case PRIV_VFS_MOUNT_NONUSER:
case PRIV_VFS_SETGID:
case PRIV_VFS_STICKYFILE:
case PRIV_VFS_SYSFLAGS:
case PRIV_VFS_UNMOUNT:
/*
* Allow VM privileges; it would be nice if these were subject to
* resource limits.
*/
case PRIV_VM_MADV_PROTECT:
case PRIV_VM_MLOCK:
case PRIV_VM_MUNLOCK:
/*
* Allow some but not all network privileges. In general, dont allow
* reconfiguring the network stack, just normal use.
*/
case PRIV_NETATALK_RESERVEDPORT:
case PRIV_NETINET_RESERVEDPORT:
case PRIV_NETINET_RAW:
case PRIV_NETINET_REUSEPORT:
case PRIV_NETIPX_RESERVEDPORT:
case PRIV_NETIPX_RAW:
break;
/*
* All remaining system privileges are allow only if the process
* holds privilege with respect to the Biba policy.
*/
default:
subj = SLOT(cred->cr_label);
error = biba_subject_privileged(subj);
if (error)
return (error);
}
return (0);
}
static int
biba_proc_check_debug(struct ucred *cred, struct proc *p)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!biba_dominate_effective(obj, subj))
return (ESRCH);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_proc_check_sched(struct ucred *cred, struct proc *p)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!biba_dominate_effective(obj, subj))
return (ESRCH);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!biba_dominate_effective(obj, subj))
return (ESRCH);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_socket_check_deliver(struct socket *so, struct label *solabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *p, *s;
if (!biba_enabled)
return (0);
p = SLOT(mlabel);
s = SLOT(solabel);
return (biba_equal_effective(p, s) ? 0 : EACCES);
}
static int
biba_socket_check_relabel(struct ucred *cred, struct socket *so,
struct label *solabel, struct label *newlabel)
{
struct mac_biba *subj, *obj, *new;
int error;
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
obj = SLOT(solabel);
/*
* If there is a Biba label update for the socket, it may be an
* update of effective.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To relabel a socket, the old socket effective must be in the
* subject range.
*/
if (!biba_effective_in_range(obj, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
/*
* To relabel a socket, the new socket effective must be in
* the subject range.
*/
if (!biba_effective_in_range(new, subj))
return (EPERM);
/*
* To change the Biba label on the socket to contain EQUAL,
* the subject must have appropriate privilege.
*/
if (biba_contains_equal(new)) {
error = biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
biba_socket_check_visible(struct ucred *cred, struct socket *so,
struct label *solabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(solabel);
if (!biba_dominate_effective(obj, subj))
return (ENOENT);
return (0);
}
static void
biba_socket_create(struct ucred *cred, struct socket *so,
struct label *solabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(solabel);
biba_copy_effective(source, dest);
}
static void
biba_socket_create_mbuf(struct socket *so, struct label *solabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(solabel);
dest = SLOT(mlabel);
biba_copy_effective(source, dest);
}
static void
biba_socket_newconn(struct socket *oldso, struct label *oldsolabel,
struct socket *newso, struct label *newsolabel)
{
struct mac_biba *source, *dest;
source = SLOT(oldsolabel);
dest = SLOT(newsolabel);
biba_copy_effective(source, dest);
}
static void
biba_socket_relabel(struct ucred *cred, struct socket *so,
struct label *solabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(solabel);
biba_copy(source, dest);
}
static void
biba_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
struct socket *so, struct label *sopeerlabel)
{
struct mac_biba *source, *dest;
source = SLOT(mlabel);
dest = SLOT(sopeerlabel);
biba_copy_effective(source, dest);
}
static void
biba_socketpeer_set_from_socket(struct socket *oldso,
struct label *oldsolabel, struct socket *newso,
struct label *newsopeerlabel)
{
struct mac_biba *source, *dest;
source = SLOT(oldsolabel);
dest = SLOT(newsopeerlabel);
biba_copy_effective(source, dest);
}
static void
biba_syncache_create(struct label *label, struct inpcb *inp)
{
struct mac_biba *source, *dest;
source = SLOT(inp->inp_label);
dest = SLOT(label);
biba_copy_effective(source, dest);
}
static void
biba_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(sc_label);
dest = SLOT(mlabel);
biba_copy_effective(source, dest);
}
static int
biba_system_check_acct(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
int error;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = biba_subject_privileged(subj);
if (error)
return (error);
if (vplabel == NULL)
return (0);
obj = SLOT(vplabel);
if (!biba_high_effective(obj))
return (EACCES);
return (0);
}
static int
biba_system_check_auditctl(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
int error;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = biba_subject_privileged(subj);
if (error)
return (error);
if (vplabel == NULL)
return (0);
obj = SLOT(vplabel);
if (!biba_high_effective(obj))
return (EACCES);
return (0);
}
static int
biba_system_check_auditon(struct ucred *cred, int cmd)
{
struct mac_biba *subj;
int error;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = biba_subject_privileged(subj);
if (error)
return (error);
return (0);
}
static int
biba_system_check_swapoff(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_biba *subj;
int error;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = biba_subject_privileged(subj);
if (error)
return (error);
return (0);
}
static int
biba_system_check_swapon(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
int error;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
error = biba_subject_privileged(subj);
if (error)
return (error);
if (!biba_high_effective(obj))
return (EACCES);
return (0);
}
static int
biba_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
void *arg1, int arg2, struct sysctl_req *req)
{
struct mac_biba *subj;
int error;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
/*
* Treat sysctl variables without CTLFLAG_ANYBODY flag as biba/high,
* but also require privilege to change them.
*/
if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
if (!biba_subject_dominate_high(subj))
return (EACCES);
error = biba_subject_privileged(subj);
if (error)
return (error);
}
return (0);
}
static void
biba_sysvmsg_cleanup(struct label *msglabel)
{
bzero(SLOT(msglabel), sizeof(struct mac_biba));
}
static void
biba_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
{
struct mac_biba *source, *dest;
/* Ignore the msgq label */
source = SLOT(cred->cr_label);
dest = SLOT(msglabel);
biba_copy_effective(source, dest);
}
static int
biba_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr,
struct label *msglabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msglabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr,
struct label *msglabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msglabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel, int cmd)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
if (!biba_dominate_effective(subj, obj))
return (EACCES);
break;
case IPC_STAT:
if (!biba_dominate_effective(obj, subj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static void
biba_sysvmsq_cleanup(struct label *msqlabel)
{
bzero(SLOT(msqlabel), sizeof(struct mac_biba));
}
static void
biba_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqlabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(msqlabel);
biba_copy_effective(source, dest);
}
static int
biba_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel, int cmd)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
case SETVAL:
case SETALL:
if (!biba_dominate_effective(subj, obj))
return (EACCES);
break;
case IPC_STAT:
case GETVAL:
case GETPID:
case GETNCNT:
case GETZCNT:
case GETALL:
if (!biba_dominate_effective(obj, subj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
biba_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel, size_t accesstype)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
if (accesstype & SEM_R)
if (!biba_dominate_effective(obj, subj))
return (EACCES);
if (accesstype & SEM_A)
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static void
biba_sysvsem_cleanup(struct label *semalabel)
{
bzero(SLOT(semalabel), sizeof(struct mac_biba));
}
static void
biba_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semalabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(semalabel);
biba_copy_effective(source, dest);
}
static int
biba_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int shmflg)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
if ((shmflg & SHM_RDONLY) == 0) {
if (!biba_dominate_effective(subj, obj))
return (EACCES);
}
return (0);
}
static int
biba_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int cmd)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
if (!biba_dominate_effective(subj, obj))
return (EACCES);
break;
case IPC_STAT:
case SHM_STAT:
if (!biba_dominate_effective(obj, subj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
biba_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int shmflg)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static void
biba_sysvshm_cleanup(struct label *shmlabel)
{
bzero(SLOT(shmlabel), sizeof(struct mac_biba));
}
static void
biba_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmlabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(shmlabel);
biba_copy_effective(source, dest);
}
static int
biba_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
struct vnode *vp, struct label *vplabel)
{
struct mac_biba mb_temp, *source, *dest;
int buflen, error;
source = SLOT(mplabel);
dest = SLOT(vplabel);
buflen = sizeof(mb_temp);
bzero(&mb_temp, buflen);
error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &mb_temp, curthread);
if (error == ENOATTR || error == EOPNOTSUPP) {
/* Fall back to the mntlabel. */
biba_copy_effective(source, dest);
return (0);
} else if (error)
return (error);
if (buflen != sizeof(mb_temp)) {
printf("biba_vnode_associate_extattr: bad size %d\n",
buflen);
return (EPERM);
}
if (biba_valid(&mb_temp) != 0) {
printf("biba_vnode_associate_extattr: invalid\n");
return (EPERM);
}
if ((mb_temp.mb_flags & MAC_BIBA_FLAGS_BOTH) !=
MAC_BIBA_FLAG_EFFECTIVE) {
printf("biba_vnode_associate_extattr: not effective\n");
return (EPERM);
}
biba_copy_effective(&mb_temp, dest);
return (0);
}
static void
biba_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
struct vnode *vp, struct label *vplabel)
{
struct mac_biba *source, *dest;
source = SLOT(mplabel);
dest = SLOT(vplabel);
biba_copy_effective(source, dest);
}
static int
biba_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_create(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_exec(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct image_params *imgp,
struct label *execlabel)
{
struct mac_biba *subj, *obj, *exec;
int error;
if (execlabel != NULL) {
/*
* We currently don't permit labels to be changed at
* exec-time as part of Biba, so disallow non-NULL Biba label
* elements in the execlabel.
*/
exec = SLOT(execlabel);
error = biba_atmostflags(exec, 0);
if (error)
return (error);
}
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_link(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int prot, int flags)
{
struct mac_biba *subj, *obj;
/*
* Rely on the use of open()-time protections to handle
* non-revocation cases.
*/
if (!biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
if (!biba_dominate_effective(obj, subj))
return (EACCES);
}
if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
if (!biba_dominate_effective(subj, obj))
return (EACCES);
}
return (0);
}
static int
biba_vnode_check_open(struct ucred *cred, struct vnode *vp,
struct label *vplabel, accmode_t accmode)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
/* XXX privilege override for admin? */
if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
if (!biba_dominate_effective(obj, subj))
return (EACCES);
}
if (accmode & VMODIFY_PERMS) {
if (!biba_dominate_effective(subj, obj))
return (EACCES);
}
return (0);
}
static int
biba_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_readlink(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *newlabel)
{
struct mac_biba *old, *new, *subj;
int error;
old = SLOT(vplabel);
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
/*
* If there is a Biba label update for the vnode, it must be a
* effective label.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To perform a relabel of the vnode (Biba label or not), Biba must
* authorize the relabel.
*/
if (!biba_effective_in_range(old, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
/*
* To change the Biba label on a vnode, the new vnode label
* must be in the subject range.
*/
if (!biba_effective_in_range(new, subj))
return (EPERM);
/*
* To change the Biba label on the vnode to be EQUAL, the
* subject must have appropriate privilege.
*/
if (biba_contains_equal(new)) {
error = biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
biba_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_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_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
if (vp != NULL) {
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
}
return (0);
}
static int
biba_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type, struct acl *acl)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
/* XXX: protect the MAC EA in a special way? */
return (0);
}
static int
biba_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
struct label *vplabel, u_long flags)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
struct label *vplabel, mode_t mode)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
struct label *vplabel, uid_t uid, gid_t gid)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct timespec atime, struct timespec mtime)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_vnode_check_write(struct ucred *active_cred,
struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
biba_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_biba *source, *dest, mb_temp;
size_t buflen;
int error;
buflen = sizeof(mb_temp);
bzero(&mb_temp, buflen);
source = SLOT(cred->cr_label);
dest = SLOT(vplabel);
biba_copy_effective(source, &mb_temp);
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
if (error == 0)
biba_copy_effective(source, dest);
return (error);
}
static void
biba_vnode_relabel(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(vplabel);
biba_copy(source, dest);
}
static int
biba_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *intlabel)
{
struct mac_biba *source, mb_temp;
size_t buflen;
int error;
buflen = sizeof(mb_temp);
bzero(&mb_temp, buflen);
source = SLOT(intlabel);
if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0)
return (0);
biba_copy_effective(source, &mb_temp);
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
MAC_BIBA_EXTATTR_NAME, buflen, (char *) &mb_temp, curthread);
return (error);
}
static struct mac_policy_ops mac_biba_ops =
{
.mpo_init = biba_init,
.mpo_bpfdesc_check_receive = biba_bpfdesc_check_receive,
.mpo_bpfdesc_create = biba_bpfdesc_create,
.mpo_bpfdesc_create_mbuf = biba_bpfdesc_create_mbuf,
.mpo_bpfdesc_destroy_label = biba_destroy_label,
.mpo_bpfdesc_init_label = biba_init_label,
.mpo_cred_associate_nfsd = biba_cred_associate_nfsd,
.mpo_cred_check_relabel = biba_cred_check_relabel,
.mpo_cred_check_visible = biba_cred_check_visible,
.mpo_cred_copy_label = biba_copy_label,
.mpo_cred_create_init = biba_cred_create_init,
.mpo_cred_create_swapper = biba_cred_create_swapper,
.mpo_cred_destroy_label = biba_destroy_label,
.mpo_cred_externalize_label = biba_externalize_label,
.mpo_cred_init_label = biba_init_label,
.mpo_cred_internalize_label = biba_internalize_label,
.mpo_cred_relabel = biba_cred_relabel,
.mpo_devfs_create_device = biba_devfs_create_device,
.mpo_devfs_create_directory = biba_devfs_create_directory,
.mpo_devfs_create_symlink = biba_devfs_create_symlink,
.mpo_devfs_destroy_label = biba_destroy_label,
.mpo_devfs_init_label = biba_init_label,
.mpo_devfs_update = biba_devfs_update,
.mpo_devfs_vnode_associate = biba_devfs_vnode_associate,
.mpo_ifnet_check_relabel = biba_ifnet_check_relabel,
.mpo_ifnet_check_transmit = biba_ifnet_check_transmit,
.mpo_ifnet_copy_label = biba_copy_label,
.mpo_ifnet_create = biba_ifnet_create,
.mpo_ifnet_create_mbuf = biba_ifnet_create_mbuf,
.mpo_ifnet_destroy_label = biba_destroy_label,
.mpo_ifnet_externalize_label = biba_externalize_label,
.mpo_ifnet_init_label = biba_init_label,
.mpo_ifnet_internalize_label = biba_internalize_label,
.mpo_ifnet_relabel = biba_ifnet_relabel,
.mpo_inpcb_check_deliver = biba_inpcb_check_deliver,
.mpo_inpcb_check_visible = biba_inpcb_check_visible,
.mpo_inpcb_create = biba_inpcb_create,
.mpo_inpcb_create_mbuf = biba_inpcb_create_mbuf,
.mpo_inpcb_destroy_label = biba_destroy_label,
.mpo_inpcb_init_label = biba_init_label_waitcheck,
.mpo_inpcb_sosetlabel = biba_inpcb_sosetlabel,
.mpo_ip6q_create = biba_ip6q_create,
.mpo_ip6q_destroy_label = biba_destroy_label,
.mpo_ip6q_init_label = biba_init_label_waitcheck,
.mpo_ip6q_match = biba_ip6q_match,
.mpo_ip6q_reassemble = biba_ip6q_reassemble,
.mpo_ip6q_update = biba_ip6q_update,
.mpo_ipq_create = biba_ipq_create,
.mpo_ipq_destroy_label = biba_destroy_label,
.mpo_ipq_init_label = biba_init_label_waitcheck,
.mpo_ipq_match = biba_ipq_match,
.mpo_ipq_reassemble = biba_ipq_reassemble,
.mpo_ipq_update = biba_ipq_update,
.mpo_kld_check_load = biba_kld_check_load,
.mpo_mbuf_copy_label = biba_copy_label,
.mpo_mbuf_destroy_label = biba_destroy_label,
.mpo_mbuf_init_label = biba_init_label_waitcheck,
.mpo_mount_check_stat = biba_mount_check_stat,
.mpo_mount_create = biba_mount_create,
.mpo_mount_destroy_label = biba_destroy_label,
.mpo_mount_init_label = biba_init_label,
.mpo_netatalk_aarp_send = biba_netatalk_aarp_send,
.mpo_netinet_arp_send = biba_netinet_arp_send,
.mpo_netinet_firewall_reply = biba_netinet_firewall_reply,
.mpo_netinet_firewall_send = biba_netinet_firewall_send,
.mpo_netinet_fragment = biba_netinet_fragment,
.mpo_netinet_icmp_reply = biba_netinet_icmp_reply,
.mpo_netinet_igmp_send = biba_netinet_igmp_send,
.mpo_netinet6_nd6_send = biba_netinet6_nd6_send,
.mpo_pipe_check_ioctl = biba_pipe_check_ioctl,
.mpo_pipe_check_poll = biba_pipe_check_poll,
.mpo_pipe_check_read = biba_pipe_check_read,
.mpo_pipe_check_relabel = biba_pipe_check_relabel,
.mpo_pipe_check_stat = biba_pipe_check_stat,
.mpo_pipe_check_write = biba_pipe_check_write,
.mpo_pipe_copy_label = biba_copy_label,
.mpo_pipe_create = biba_pipe_create,
.mpo_pipe_destroy_label = biba_destroy_label,
.mpo_pipe_externalize_label = biba_externalize_label,
.mpo_pipe_init_label = biba_init_label,
.mpo_pipe_internalize_label = biba_internalize_label,
.mpo_pipe_relabel = biba_pipe_relabel,
.mpo_posixsem_check_getvalue = biba_posixsem_check_rdonly,
.mpo_posixsem_check_open = biba_posixsem_check_openunlink,
.mpo_posixsem_check_post = biba_posixsem_check_write,
.mpo_posixsem_check_stat = biba_posixsem_check_rdonly,
.mpo_posixsem_check_unlink = biba_posixsem_check_openunlink,
.mpo_posixsem_check_wait = biba_posixsem_check_write,
.mpo_posixsem_create = biba_posixsem_create,
.mpo_posixsem_destroy_label = biba_destroy_label,
.mpo_posixsem_init_label = biba_init_label,
.mpo_priv_check = biba_priv_check,
.mpo_proc_check_debug = biba_proc_check_debug,
.mpo_proc_check_sched = biba_proc_check_sched,
.mpo_proc_check_signal = biba_proc_check_signal,
.mpo_socket_check_deliver = biba_socket_check_deliver,
.mpo_socket_check_relabel = biba_socket_check_relabel,
.mpo_socket_check_visible = biba_socket_check_visible,
.mpo_socket_copy_label = biba_copy_label,
.mpo_socket_create = biba_socket_create,
.mpo_socket_create_mbuf = biba_socket_create_mbuf,
.mpo_socket_destroy_label = biba_destroy_label,
.mpo_socket_externalize_label = biba_externalize_label,
.mpo_socket_init_label = biba_init_label_waitcheck,
.mpo_socket_internalize_label = biba_internalize_label,
.mpo_socket_newconn = biba_socket_newconn,
.mpo_socket_relabel = biba_socket_relabel,
.mpo_socketpeer_destroy_label = biba_destroy_label,
.mpo_socketpeer_externalize_label = biba_externalize_label,
.mpo_socketpeer_init_label = biba_init_label_waitcheck,
.mpo_socketpeer_set_from_mbuf = biba_socketpeer_set_from_mbuf,
.mpo_socketpeer_set_from_socket = biba_socketpeer_set_from_socket,
.mpo_syncache_create = biba_syncache_create,
.mpo_syncache_create_mbuf = biba_syncache_create_mbuf,
.mpo_syncache_destroy_label = biba_destroy_label,
.mpo_syncache_init_label = biba_init_label_waitcheck,
.mpo_system_check_acct = biba_system_check_acct,
.mpo_system_check_auditctl = biba_system_check_auditctl,
.mpo_system_check_auditon = biba_system_check_auditon,
.mpo_system_check_swapoff = biba_system_check_swapoff,
.mpo_system_check_swapon = biba_system_check_swapon,
.mpo_system_check_sysctl = biba_system_check_sysctl,
.mpo_sysvmsg_cleanup = biba_sysvmsg_cleanup,
.mpo_sysvmsg_create = biba_sysvmsg_create,
.mpo_sysvmsg_destroy_label = biba_destroy_label,
.mpo_sysvmsg_init_label = biba_init_label,
.mpo_sysvmsq_check_msgrcv = biba_sysvmsq_check_msgrcv,
.mpo_sysvmsq_check_msgrmid = biba_sysvmsq_check_msgrmid,
.mpo_sysvmsq_check_msqget = biba_sysvmsq_check_msqget,
.mpo_sysvmsq_check_msqsnd = biba_sysvmsq_check_msqsnd,
.mpo_sysvmsq_check_msqrcv = biba_sysvmsq_check_msqrcv,
.mpo_sysvmsq_check_msqctl = biba_sysvmsq_check_msqctl,
.mpo_sysvmsq_cleanup = biba_sysvmsq_cleanup,
.mpo_sysvmsq_create = biba_sysvmsq_create,
.mpo_sysvmsq_destroy_label = biba_destroy_label,
.mpo_sysvmsq_init_label = biba_init_label,
.mpo_sysvsem_check_semctl = biba_sysvsem_check_semctl,
.mpo_sysvsem_check_semget = biba_sysvsem_check_semget,
.mpo_sysvsem_check_semop = biba_sysvsem_check_semop,
.mpo_sysvsem_cleanup = biba_sysvsem_cleanup,
.mpo_sysvsem_create = biba_sysvsem_create,
.mpo_sysvsem_destroy_label = biba_destroy_label,
.mpo_sysvsem_init_label = biba_init_label,
.mpo_sysvshm_check_shmat = biba_sysvshm_check_shmat,
.mpo_sysvshm_check_shmctl = biba_sysvshm_check_shmctl,
.mpo_sysvshm_check_shmget = biba_sysvshm_check_shmget,
.mpo_sysvshm_cleanup = biba_sysvshm_cleanup,
.mpo_sysvshm_create = biba_sysvshm_create,
.mpo_sysvshm_destroy_label = biba_destroy_label,
.mpo_sysvshm_init_label = biba_init_label,
.mpo_vnode_associate_extattr = biba_vnode_associate_extattr,
.mpo_vnode_associate_singlelabel = biba_vnode_associate_singlelabel,
.mpo_vnode_check_access = biba_vnode_check_open,
.mpo_vnode_check_chdir = biba_vnode_check_chdir,
.mpo_vnode_check_chroot = biba_vnode_check_chroot,
.mpo_vnode_check_create = biba_vnode_check_create,
.mpo_vnode_check_deleteacl = biba_vnode_check_deleteacl,
.mpo_vnode_check_deleteextattr = biba_vnode_check_deleteextattr,
.mpo_vnode_check_exec = biba_vnode_check_exec,
.mpo_vnode_check_getacl = biba_vnode_check_getacl,
.mpo_vnode_check_getextattr = biba_vnode_check_getextattr,
.mpo_vnode_check_link = biba_vnode_check_link,
.mpo_vnode_check_listextattr = biba_vnode_check_listextattr,
.mpo_vnode_check_lookup = biba_vnode_check_lookup,
.mpo_vnode_check_mmap = biba_vnode_check_mmap,
.mpo_vnode_check_open = biba_vnode_check_open,
.mpo_vnode_check_poll = biba_vnode_check_poll,
.mpo_vnode_check_read = biba_vnode_check_read,
.mpo_vnode_check_readdir = biba_vnode_check_readdir,
.mpo_vnode_check_readlink = biba_vnode_check_readlink,
.mpo_vnode_check_relabel = biba_vnode_check_relabel,
.mpo_vnode_check_rename_from = biba_vnode_check_rename_from,
.mpo_vnode_check_rename_to = biba_vnode_check_rename_to,
.mpo_vnode_check_revoke = biba_vnode_check_revoke,
.mpo_vnode_check_setacl = biba_vnode_check_setacl,
.mpo_vnode_check_setextattr = biba_vnode_check_setextattr,
.mpo_vnode_check_setflags = biba_vnode_check_setflags,
.mpo_vnode_check_setmode = biba_vnode_check_setmode,
.mpo_vnode_check_setowner = biba_vnode_check_setowner,
.mpo_vnode_check_setutimes = biba_vnode_check_setutimes,
.mpo_vnode_check_stat = biba_vnode_check_stat,
.mpo_vnode_check_unlink = biba_vnode_check_unlink,
.mpo_vnode_check_write = biba_vnode_check_write,
.mpo_vnode_create_extattr = biba_vnode_create_extattr,
.mpo_vnode_copy_label = biba_copy_label,
.mpo_vnode_destroy_label = biba_destroy_label,
.mpo_vnode_externalize_label = biba_externalize_label,
.mpo_vnode_init_label = biba_init_label,
.mpo_vnode_internalize_label = biba_internalize_label,
.mpo_vnode_relabel = biba_vnode_relabel,
.mpo_vnode_setlabel_extattr = biba_vnode_setlabel_extattr,
};
MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba",
MPC_LOADTIME_FLAG_NOTLATE, &biba_slot);
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