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freebsd-skq/sys/security/mac_lomac/mac_lomac.c
Robert Watson 84bdb0837a Correct logic for filling out a "new" label during a credential 
change in mac_lomac: if both flags are set on the new label, we
may not need to always fill out the label (only if one flag is
set, not both).  Avoid stomping on a section of the label if we
are in fact modifying both elements.

Because we know that both flags will be set, we don't need to
test whether the range or single are set in later consistency
checks of the range and single -- just test them.

By checking the range of the new vs. the range of the old label
before testing the single against the new range, we implicitly
test that the new single is in the old range.  Document this
with a comment.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories
2003-08-21 18:07:52 +00:00

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/*-
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
* Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* This software was developed for the FreeBSD Project in part by NAI Labs,
* the Security Research Division of Network Associates, Inc. under
* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
* CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Developed by the TrustedBSD Project.
* Low-watermark floating label mandatory integrity policy.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/acl.h>
#include <sys/conf.h>
#include <sys/extattr.h>
#include <sys/kernel.h>
#include <sys/mac.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/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/sysctl.h>
#include <sys/syslog.h>
#include <fs/devfs/devfs.h>
#include <net/bpfdesc.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/ip_var.h>
#include <vm/vm.h>
#include <sys/mac_policy.h>
#include <security/mac_lomac/mac_lomac.h>
struct mac_lomac_proc {
struct mac_lomac mac_lomac;
struct mtx mtx;
};
SYSCTL_DECL(_security_mac);
SYSCTL_NODE(_security_mac, OID_AUTO, lomac, CTLFLAG_RW, 0,
"TrustedBSD mac_lomac policy controls");
static int mac_lomac_label_size = sizeof(struct mac_lomac);
SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD,
&mac_lomac_label_size, 0, "Size of struct mac_lomac");
static int mac_lomac_enabled = 1;
SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RW,
&mac_lomac_enabled, 0, "Enforce MAC/LOMAC policy");
TUNABLE_INT("security.mac.lomac.enabled", &mac_lomac_enabled);
static int destroyed_not_inited;
SYSCTL_INT(_security_mac_lomac, 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_lomac, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
&trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC");
TUNABLE_INT("security.mac.lomac.trust_all_interfaces", &trust_all_interfaces);
static char trusted_interfaces[128];
SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC");
TUNABLE_STR("security.mac.lomac.trusted_interfaces", trusted_interfaces,
sizeof(trusted_interfaces));
static int ptys_equal = 0;
SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RW,
&ptys_equal, 0, "Label pty devices as lomac/equal on create");
TUNABLE_INT("security.mac.lomac.ptys_equal", &ptys_equal);
static int revocation_enabled = 1;
SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RW,
&revocation_enabled, 0, "Revoke access to objects on relabel");
TUNABLE_INT("security.mac.lomac.revocation_enabled", &revocation_enabled);
static int mac_lomac_slot;
#define SLOT(l) ((struct mac_lomac *)LABEL_TO_SLOT((l), mac_lomac_slot).l_ptr)
#define PSLOT(l) ((struct mac_lomac_proc *) \
LABEL_TO_SLOT((l), mac_lomac_slot).l_ptr)
MALLOC_DEFINE(M_MACLOMAC, "lomac label", "MAC/LOMAC labels");
static struct mac_lomac *
lomac_alloc(int flag)
{
struct mac_lomac *mac_lomac;
mac_lomac = malloc(sizeof(struct mac_lomac), M_MACLOMAC, M_ZERO | flag);
return (mac_lomac);
}
static void
lomac_free(struct mac_lomac *mac_lomac)
{
if (mac_lomac != NULL)
free(mac_lomac, M_MACLOMAC);
else
atomic_add_int(&destroyed_not_inited, 1);
}
static int
lomac_atmostflags(struct mac_lomac *mac_lomac, int flags)
{
if ((mac_lomac->ml_flags & flags) != mac_lomac->ml_flags)
return (EINVAL);
return (0);
}
static int
mac_lomac_dominate_element(struct mac_lomac_element *a,
struct mac_lomac_element *b)
{
switch (a->mle_type) {
case MAC_LOMAC_TYPE_EQUAL:
case MAC_LOMAC_TYPE_HIGH:
return (1);
case MAC_LOMAC_TYPE_LOW:
switch (b->mle_type) {
case MAC_LOMAC_TYPE_GRADE:
case MAC_LOMAC_TYPE_HIGH:
return (0);
case MAC_LOMAC_TYPE_EQUAL:
case MAC_LOMAC_TYPE_LOW:
return (1);
default:
panic("mac_lomac_dominate_element: b->mle_type invalid");
}
case MAC_LOMAC_TYPE_GRADE:
switch (b->mle_type) {
case MAC_LOMAC_TYPE_EQUAL:
case MAC_LOMAC_TYPE_LOW:
return (1);
case MAC_LOMAC_TYPE_HIGH:
return (0);
case MAC_LOMAC_TYPE_GRADE:
return (a->mle_grade >= b->mle_grade);
default:
panic("mac_lomac_dominate_element: b->mle_type invalid");
}
default:
panic("mac_lomac_dominate_element: a->mle_type invalid");
}
}
static int
mac_lomac_range_in_range(struct mac_lomac *rangea, struct mac_lomac *rangeb)
{
return (mac_lomac_dominate_element(&rangeb->ml_rangehigh,
&rangea->ml_rangehigh) &&
mac_lomac_dominate_element(&rangea->ml_rangelow,
&rangeb->ml_rangelow));
}
static int
mac_lomac_single_in_range(struct mac_lomac *single, struct mac_lomac *range)
{
KASSERT((single->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("mac_lomac_single_in_range: a not single"));
KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
("mac_lomac_single_in_range: b not range"));
return (mac_lomac_dominate_element(&range->ml_rangehigh,
&single->ml_single) &&
mac_lomac_dominate_element(&single->ml_single,
&range->ml_rangelow));
}
static int
mac_lomac_auxsingle_in_range(struct mac_lomac *single, struct mac_lomac *range)
{
KASSERT((single->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
("mac_lomac_single_in_range: a not auxsingle"));
KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
("mac_lomac_single_in_range: b not range"));
return (mac_lomac_dominate_element(&range->ml_rangehigh,
&single->ml_auxsingle) &&
mac_lomac_dominate_element(&single->ml_auxsingle,
&range->ml_rangelow));
}
static int
mac_lomac_dominate_single(struct mac_lomac *a, struct mac_lomac *b)
{
KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("mac_lomac_dominate_single: a not single"));
KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("mac_lomac_dominate_single: b not single"));
return (mac_lomac_dominate_element(&a->ml_single, &b->ml_single));
}
static int
mac_lomac_subject_dominate(struct mac_lomac *a, struct mac_lomac *b)
{
KASSERT((~a->ml_flags &
(MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)) == 0,
("mac_lomac_dominate_single: a not subject"));
KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("mac_lomac_dominate_single: b not single"));
return (mac_lomac_dominate_element(&a->ml_rangehigh,
&b->ml_single));
}
static int
mac_lomac_equal_element(struct mac_lomac_element *a, struct mac_lomac_element *b)
{
if (a->mle_type == MAC_LOMAC_TYPE_EQUAL ||
b->mle_type == MAC_LOMAC_TYPE_EQUAL)
return (1);
return (a->mle_type == b->mle_type && a->mle_grade == b->mle_grade);
}
static int
mac_lomac_equal_single(struct mac_lomac *a, struct mac_lomac *b)
{
KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("mac_lomac_equal_single: a not single"));
KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("mac_lomac_equal_single: b not single"));
return (mac_lomac_equal_element(&a->ml_single, &b->ml_single));
}
static int
mac_lomac_contains_equal(struct mac_lomac *mac_lomac)
{
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE)
if (mac_lomac->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (1);
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX)
if (mac_lomac->ml_auxsingle.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (1);
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
if (mac_lomac->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (1);
if (mac_lomac->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (1);
}
return (0);
}
static int
mac_lomac_subject_privileged(struct mac_lomac *mac_lomac)
{
KASSERT((mac_lomac->ml_flags & MAC_LOMAC_FLAGS_BOTH) ==
MAC_LOMAC_FLAGS_BOTH,
("mac_lomac_subject_privileged: subject doesn't have both labels"));
/* If the single is EQUAL, it's ok. */
if (mac_lomac->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (0);
/* If either range endpoint is EQUAL, it's ok. */
if (mac_lomac->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL ||
mac_lomac->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (0);
/* If the range is low-high, it's ok. */
if (mac_lomac->ml_rangelow.mle_type == MAC_LOMAC_TYPE_LOW &&
mac_lomac->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_HIGH)
return (0);
/* It's not ok. */
return (EPERM);
}
static int
mac_lomac_high_single(struct mac_lomac *mac_lomac)
{
KASSERT((mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("mac_lomac_high_single: mac_lomac not single"));
return (mac_lomac->ml_single.mle_type == MAC_LOMAC_TYPE_HIGH);
}
static int
mac_lomac_valid(struct mac_lomac *mac_lomac)
{
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
switch (mac_lomac->ml_single.mle_type) {
case MAC_LOMAC_TYPE_GRADE:
case MAC_LOMAC_TYPE_EQUAL:
case MAC_LOMAC_TYPE_HIGH:
case MAC_LOMAC_TYPE_LOW:
break;
default:
return (EINVAL);
}
} else {
if (mac_lomac->ml_single.mle_type != MAC_LOMAC_TYPE_UNDEF)
return (EINVAL);
}
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX) {
switch (mac_lomac->ml_auxsingle.mle_type) {
case MAC_LOMAC_TYPE_GRADE:
case MAC_LOMAC_TYPE_EQUAL:
case MAC_LOMAC_TYPE_HIGH:
case MAC_LOMAC_TYPE_LOW:
break;
default:
return (EINVAL);
}
} else {
if (mac_lomac->ml_auxsingle.mle_type != MAC_LOMAC_TYPE_UNDEF)
return (EINVAL);
}
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
switch (mac_lomac->ml_rangelow.mle_type) {
case MAC_LOMAC_TYPE_GRADE:
case MAC_LOMAC_TYPE_EQUAL:
case MAC_LOMAC_TYPE_HIGH:
case MAC_LOMAC_TYPE_LOW:
break;
default:
return (EINVAL);
}
switch (mac_lomac->ml_rangehigh.mle_type) {
case MAC_LOMAC_TYPE_GRADE:
case MAC_LOMAC_TYPE_EQUAL:
case MAC_LOMAC_TYPE_HIGH:
case MAC_LOMAC_TYPE_LOW:
break;
default:
return (EINVAL);
}
if (!mac_lomac_dominate_element(&mac_lomac->ml_rangehigh,
&mac_lomac->ml_rangelow))
return (EINVAL);
} else {
if (mac_lomac->ml_rangelow.mle_type != MAC_LOMAC_TYPE_UNDEF ||
mac_lomac->ml_rangehigh.mle_type != MAC_LOMAC_TYPE_UNDEF)
return (EINVAL);
}
return (0);
}
static void
mac_lomac_set_range(struct mac_lomac *mac_lomac, u_short typelow,
u_short gradelow, u_short typehigh, u_short gradehigh)
{
mac_lomac->ml_rangelow.mle_type = typelow;
mac_lomac->ml_rangelow.mle_grade = gradelow;
mac_lomac->ml_rangehigh.mle_type = typehigh;
mac_lomac->ml_rangehigh.mle_grade = gradehigh;
mac_lomac->ml_flags |= MAC_LOMAC_FLAG_RANGE;
}
static void
mac_lomac_set_single(struct mac_lomac *mac_lomac, u_short type, u_short grade)
{
mac_lomac->ml_single.mle_type = type;
mac_lomac->ml_single.mle_grade = grade;
mac_lomac->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
}
static void
mac_lomac_copy_range(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
{
KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
("mac_lomac_copy_range: labelfrom not range"));
labelto->ml_rangelow = labelfrom->ml_rangelow;
labelto->ml_rangehigh = labelfrom->ml_rangehigh;
labelto->ml_flags |= MAC_LOMAC_FLAG_RANGE;
}
static void
mac_lomac_copy_single(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
{
KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("mac_lomac_copy_single: labelfrom not single"));
labelto->ml_single = labelfrom->ml_single;
labelto->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
}
static void
mac_lomac_copy_auxsingle(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
{
KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
("mac_lomac_copy_auxsingle: labelfrom not auxsingle"));
labelto->ml_auxsingle = labelfrom->ml_auxsingle;
labelto->ml_flags |= MAC_LOMAC_FLAG_AUX;
}
static void
mac_lomac_copy(struct mac_lomac *source, struct mac_lomac *dest)
{
if (source->ml_flags & MAC_LOMAC_FLAG_SINGLE)
mac_lomac_copy_single(source, dest);
if (source->ml_flags & MAC_LOMAC_FLAG_AUX)
mac_lomac_copy_auxsingle(source, dest);
if (source->ml_flags & MAC_LOMAC_FLAG_RANGE)
mac_lomac_copy_range(source, dest);
}
static int mac_lomac_to_string(struct sbuf *sb,
struct mac_lomac *mac_lomac);
static int
maybe_demote(struct mac_lomac *subjlabel, struct mac_lomac *objlabel,
const char *actionname, const char *objname, struct vnode *vpq)
{
struct sbuf subjlabel_sb, subjtext_sb, objlabel_sb;
char *subjlabeltext, *objlabeltext, *subjtext;
struct mac_lomac cached_subjlabel;
struct mac_lomac_proc *subj;
struct vattr va;
struct proc *p;
pid_t pgid;
subj = PSLOT(&curthread->td_proc->p_label);
p = curthread->td_proc;
mtx_lock(&subj->mtx);
if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
/*
* Check to see if the pending demotion would be more or
* less severe than this one, and keep the more severe.
* This can only happen for a multi-threaded application.
*/
if (mac_lomac_dominate_single(objlabel, &subj->mac_lomac)) {
mtx_unlock(&subj->mtx);
return (0);
}
}
bzero(&subj->mac_lomac, sizeof(subj->mac_lomac));
/*
* Always demote the single label.
*/
mac_lomac_copy_single(objlabel, &subj->mac_lomac);
/*
* Start with the original range, then minimize each side of
* the range to the point of not dominating the object. The
* high side will always be demoted, of course.
*/
mac_lomac_copy_range(subjlabel, &subj->mac_lomac);
if (!mac_lomac_dominate_element(&objlabel->ml_single,
&subj->mac_lomac.ml_rangelow))
subj->mac_lomac.ml_rangelow = objlabel->ml_single;
subj->mac_lomac.ml_rangehigh = objlabel->ml_single;
subj->mac_lomac.ml_flags |= MAC_LOMAC_FLAG_UPDATE;
mtx_lock_spin(&sched_lock);
curthread->td_flags |= TDF_ASTPENDING;
curthread->td_proc->p_sflag |= PS_MACPEND;
mtx_unlock_spin(&sched_lock);
/*
* Avoid memory allocation while holding a mutex; cache the
* label.
*/
mac_lomac_copy_single(&subj->mac_lomac, &cached_subjlabel);
mtx_unlock(&subj->mtx);
sbuf_new(&subjlabel_sb, NULL, 0, SBUF_AUTOEXTEND);
mac_lomac_to_string(&subjlabel_sb, subjlabel);
sbuf_finish(&subjlabel_sb);
subjlabeltext = sbuf_data(&subjlabel_sb);
sbuf_new(&subjtext_sb, NULL, 0, SBUF_AUTOEXTEND);
mac_lomac_to_string(&subjtext_sb, &subj->mac_lomac);
sbuf_finish(&subjtext_sb);
subjtext = sbuf_data(&subjtext_sb);
sbuf_new(&objlabel_sb, NULL, 0, SBUF_AUTOEXTEND);
mac_lomac_to_string(&objlabel_sb, objlabel);
sbuf_finish(&objlabel_sb);
objlabeltext = sbuf_data(&objlabel_sb);
pgid = p->p_pgrp->pg_id; /* XXX could be stale? */
if (vpq != NULL && VOP_GETATTR(vpq, &va, curthread->td_ucred,
curthread) == 0) {
log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
" level %s after %s a level-%s %s (inode=%ld, "
"mountpount=%s)\n",
subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
p->p_comm, subjtext, actionname, objlabeltext, objname,
va.va_fileid, vpq->v_mount->mnt_stat.f_mntonname);
} else {
log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
" level %s after %s a level-%s %s\n",
subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
p->p_comm, subjtext, actionname, objlabeltext, objname);
}
sbuf_delete(&subjlabel_sb);
sbuf_delete(&subjtext_sb);
sbuf_delete(&objlabel_sb);
return (0);
}
/*
* Relabel "to" to "from" only if "from" is a valid label (contains
* at least a single), as for a relabel operation which may or may
* not involve a relevant label.
*/
static void
try_relabel(struct mac_lomac *from, struct mac_lomac *to)
{
if (from->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
bzero(to, sizeof(*to));
mac_lomac_copy(from, to);
}
}
/*
* Policy module operations.
*/
static void
mac_lomac_destroy(struct mac_policy_conf *conf)
{
}
static void
mac_lomac_init(struct mac_policy_conf *conf)
{
}
/*
* Label operations.
*/
static void
mac_lomac_init_label(struct label *label)
{
SLOT(label) = lomac_alloc(M_WAITOK);
}
static int
mac_lomac_init_label_waitcheck(struct label *label, int flag)
{
SLOT(label) = lomac_alloc(flag);
if (SLOT(label) == NULL)
return (ENOMEM);
return (0);
}
static void
mac_lomac_init_proc_label(struct label *label)
{
PSLOT(label) = malloc(sizeof(struct mac_lomac_proc), M_MACLOMAC,
M_ZERO | M_WAITOK);
mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF);
}
static void
mac_lomac_destroy_label(struct label *label)
{
lomac_free(SLOT(label));
SLOT(label) = NULL;
}
static void
mac_lomac_destroy_proc_label(struct label *label)
{
mtx_destroy(&PSLOT(label)->mtx);
FREE(PSLOT(label), M_MACLOMAC);
PSLOT(label) = NULL;
}
static int
mac_lomac_element_to_string(struct sbuf *sb, struct mac_lomac_element *element)
{
switch (element->mle_type) {
case MAC_LOMAC_TYPE_HIGH:
return (sbuf_printf(sb, "high"));
case MAC_LOMAC_TYPE_LOW:
return (sbuf_printf(sb, "low"));
case MAC_LOMAC_TYPE_EQUAL:
return (sbuf_printf(sb, "equal"));
case MAC_LOMAC_TYPE_GRADE:
return (sbuf_printf(sb, "%d", element->mle_grade));
default:
panic("mac_lomac_element_to_string: invalid type (%d)",
element->mle_type);
}
}
static int
mac_lomac_to_string(struct sbuf *sb, struct mac_lomac *mac_lomac)
{
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
if (mac_lomac_element_to_string(sb, &mac_lomac->ml_single)
== -1)
return (EINVAL);
}
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX) {
if (sbuf_putc(sb, '[') == -1)
return (EINVAL);
if (mac_lomac_element_to_string(sb, &mac_lomac->ml_auxsingle)
== -1)
return (EINVAL);
if (sbuf_putc(sb, ']') == -1)
return (EINVAL);
}
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
if (sbuf_putc(sb, '(') == -1)
return (EINVAL);
if (mac_lomac_element_to_string(sb, &mac_lomac->ml_rangelow)
== -1)
return (EINVAL);
if (sbuf_putc(sb, '-') == -1)
return (EINVAL);
if (mac_lomac_element_to_string(sb, &mac_lomac->ml_rangehigh)
== -1)
return (EINVAL);
if (sbuf_putc(sb, '-') == -1)
return (EINVAL);
}
return (0);
}
static int
mac_lomac_externalize_label(struct label *label, char *element_name,
struct sbuf *sb, int *claimed)
{
struct mac_lomac *mac_lomac;
if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
mac_lomac = SLOT(label);
return (mac_lomac_to_string(sb, mac_lomac));
}
static int
mac_lomac_parse_element(struct mac_lomac_element *element, char *string)
{
if (strcmp(string, "high") == 0 ||
strcmp(string, "hi") == 0) {
element->mle_type = MAC_LOMAC_TYPE_HIGH;
element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
} else if (strcmp(string, "low") == 0 ||
strcmp(string, "lo") == 0) {
element->mle_type = MAC_LOMAC_TYPE_LOW;
element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
} else if (strcmp(string, "equal") == 0 ||
strcmp(string, "eq") == 0) {
element->mle_type = MAC_LOMAC_TYPE_EQUAL;
element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
} else {
char *p0, *p1;
int d;
p0 = string;
d = strtol(p0, &p1, 10);
if (d < 0 || d > 65535)
return (EINVAL);
element->mle_type = MAC_LOMAC_TYPE_GRADE;
element->mle_grade = d;
if (p1 == p0 || *p1 != '\0')
return (EINVAL);
}
return (0);
}
/*
* Note: destructively consumes the string, make a local copy before
* calling if that's a problem.
*/
static int
mac_lomac_parse(struct mac_lomac *mac_lomac, char *string)
{
char *range, *rangeend, *rangehigh, *rangelow, *single, *auxsingle,
*auxsingleend;
int error;
/* Do we have a range? */
single = string;
range = index(string, '(');
if (range == single)
single = NULL;
auxsingle = index(string, '[');
if (auxsingle == single)
single = NULL;
if (range != NULL && auxsingle != NULL)
return (EINVAL);
rangelow = rangehigh = NULL;
if (range != NULL) {
/* Nul terminate the end of the single string. */
*range = '\0';
range++;
rangelow = range;
rangehigh = index(rangelow, '-');
if (rangehigh == NULL)
return (EINVAL);
rangehigh++;
if (*rangelow == '\0' || *rangehigh == '\0')
return (EINVAL);
rangeend = index(rangehigh, ')');
if (rangeend == NULL)
return (EINVAL);
if (*(rangeend + 1) != '\0')
return (EINVAL);
/* Nul terminate the ends of the ranges. */
*(rangehigh - 1) = '\0';
*rangeend = '\0';
}
KASSERT((rangelow != NULL && rangehigh != NULL) ||
(rangelow == NULL && rangehigh == NULL),
("mac_lomac_internalize_label: range mismatch"));
if (auxsingle != NULL) {
/* Nul terminate the end of the single string. */
*auxsingle = '\0';
auxsingle++;
auxsingleend = index(auxsingle, ']');
if (auxsingleend == NULL)
return (EINVAL);
if (*(auxsingleend + 1) != '\0')
return (EINVAL);
/* Nul terminate the end of the auxsingle. */
*auxsingleend = '\0';
}
bzero(mac_lomac, sizeof(*mac_lomac));
if (single != NULL) {
error = mac_lomac_parse_element(&mac_lomac->ml_single, single);
if (error)
return (error);
mac_lomac->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
}
if (auxsingle != NULL) {
error = mac_lomac_parse_element(&mac_lomac->ml_auxsingle,
auxsingle);
if (error)
return (error);
mac_lomac->ml_flags |= MAC_LOMAC_FLAG_AUX;
}
if (rangelow != NULL) {
error = mac_lomac_parse_element(&mac_lomac->ml_rangelow,
rangelow);
if (error)
return (error);
error = mac_lomac_parse_element(&mac_lomac->ml_rangehigh,
rangehigh);
if (error)
return (error);
mac_lomac->ml_flags |= MAC_LOMAC_FLAG_RANGE;
}
error = mac_lomac_valid(mac_lomac);
if (error)
return (error);
return (0);
}
static int
mac_lomac_internalize_label(struct label *label, char *element_name,
char *element_data, int *claimed)
{
struct mac_lomac *mac_lomac, mac_lomac_temp;
int error;
if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
error = mac_lomac_parse(&mac_lomac_temp, element_data);
if (error)
return (error);
mac_lomac = SLOT(label);
*mac_lomac = mac_lomac_temp;
return (0);
}
static void
mac_lomac_copy_label(struct label *src, struct label *dest)
{
*SLOT(dest) = *SLOT(src);
}
/*
* Labeling event operations: file system objects, and things that look
* a lot like file system objects.
*/
static void
mac_lomac_create_devfs_device(struct mount *mp, dev_t dev,
struct devfs_dirent *devfs_dirent, struct label *label)
{
struct mac_lomac *mac_lomac;
int lomac_type;
mac_lomac = SLOT(label);
if (strcmp(dev->si_name, "null") == 0 ||
strcmp(dev->si_name, "zero") == 0 ||
strcmp(dev->si_name, "random") == 0 ||
strncmp(dev->si_name, "fd/", strlen("fd/")) == 0 ||
strncmp(dev->si_name, "ttyv", strlen("ttyv")) == 0)
lomac_type = MAC_LOMAC_TYPE_EQUAL;
else if (ptys_equal &&
(strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
lomac_type = MAC_LOMAC_TYPE_EQUAL;
else
lomac_type = MAC_LOMAC_TYPE_HIGH;
mac_lomac_set_single(mac_lomac, lomac_type, 0);
}
static void
mac_lomac_create_devfs_directory(struct mount *mp, char *dirname,
int dirnamelen, struct devfs_dirent *devfs_dirent, struct label *label)
{
struct mac_lomac *mac_lomac;
mac_lomac = SLOT(label);
mac_lomac_set_single(mac_lomac, MAC_LOMAC_TYPE_HIGH, 0);
}
static void
mac_lomac_create_devfs_symlink(struct ucred *cred, struct mount *mp,
struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
struct label *delabel)
{
struct mac_lomac *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(delabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_mount(struct ucred *cred, struct mount *mp,
struct label *mntlabel, struct label *fslabel)
{
struct mac_lomac *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(mntlabel);
mac_lomac_copy_single(source, dest);
dest = SLOT(fslabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_root_mount(struct ucred *cred, struct mount *mp,
struct label *mntlabel, struct label *fslabel)
{
struct mac_lomac *mac_lomac;
/* Always mount root as high integrity. */
mac_lomac = SLOT(fslabel);
mac_lomac_set_single(mac_lomac, MAC_LOMAC_TYPE_HIGH, 0);
mac_lomac = SLOT(mntlabel);
mac_lomac_set_single(mac_lomac, MAC_LOMAC_TYPE_HIGH, 0);
}
static void
mac_lomac_relabel_vnode(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, struct label *label)
{
struct mac_lomac *source, *dest;
source = SLOT(label);
dest = SLOT(vnodelabel);
try_relabel(source, dest);
}
static void
mac_lomac_update_devfsdirent(struct mount *mp,
struct devfs_dirent *devfs_dirent, struct label *direntlabel,
struct vnode *vp, struct label *vnodelabel)
{
struct mac_lomac *source, *dest;
source = SLOT(vnodelabel);
dest = SLOT(direntlabel);
mac_lomac_copy(source, dest);
}
static void
mac_lomac_associate_vnode_devfs(struct mount *mp, struct label *fslabel,
struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
struct label *vlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(delabel);
dest = SLOT(vlabel);
mac_lomac_copy_single(source, dest);
}
static int
mac_lomac_associate_vnode_extattr(struct mount *mp, struct label *fslabel,
struct vnode *vp, struct label *vlabel)
{
struct mac_lomac temp, *source, *dest;
int buflen, error;
source = SLOT(fslabel);
dest = SLOT(vlabel);
buflen = sizeof(temp);
bzero(&temp, buflen);
error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&temp, curthread);
if (error == ENOATTR || error == EOPNOTSUPP) {
/* Fall back to the fslabel. */
mac_lomac_copy_single(source, dest);
return (0);
} else if (error)
return (error);
if (buflen != sizeof(temp)) {
if (buflen != sizeof(temp) - sizeof(temp.ml_auxsingle)) {
printf("mac_lomac_associate_vnode_extattr: bad size %d\n",
buflen);
return (EPERM);
}
bzero(&temp.ml_auxsingle, sizeof(temp.ml_auxsingle));
buflen = sizeof(temp);
(void)vn_extattr_set(vp, IO_NODELOCKED,
MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME,
buflen, (char *)&temp, curthread);
}
if (mac_lomac_valid(&temp) != 0) {
printf("mac_lomac_associate_vnode_extattr: invalid\n");
return (EPERM);
}
if ((temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) != MAC_LOMAC_FLAG_SINGLE) {
printf("mac_lomac_associate_vnode_extattr: not single\n");
return (EPERM);
}
mac_lomac_copy_single(&temp, dest);
return (0);
}
static void
mac_lomac_associate_vnode_singlelabel(struct mount *mp,
struct label *fslabel, struct vnode *vp, struct label *vlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(fslabel);
dest = SLOT(vlabel);
mac_lomac_copy_single(source, dest);
}
static int
mac_lomac_create_vnode_extattr(struct ucred *cred, struct mount *mp,
struct label *fslabel, struct vnode *dvp, struct label *dlabel,
struct vnode *vp, struct label *vlabel, struct componentname *cnp)
{
struct mac_lomac *source, *dest, *dir, temp;
size_t buflen;
int error;
buflen = sizeof(temp);
bzero(&temp, buflen);
source = SLOT(&cred->cr_label);
dest = SLOT(vlabel);
dir = SLOT(dlabel);
if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) {
mac_lomac_copy_auxsingle(dir, &temp);
mac_lomac_set_single(&temp, dir->ml_auxsingle.mle_type,
dir->ml_auxsingle.mle_grade);
} else {
mac_lomac_copy_single(source, &temp);
}
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
if (error == 0)
mac_lomac_copy(&temp, dest);
return (error);
}
static int
mac_lomac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp,
struct label *vlabel, struct label *intlabel)
{
struct mac_lomac *source, temp;
size_t buflen;
int error;
buflen = sizeof(temp);
bzero(&temp, buflen);
source = SLOT(intlabel);
if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
return (0);
mac_lomac_copy_single(source, &temp);
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
return (error);
}
/*
* Labeling event operations: IPC object.
*/
static void
mac_lomac_create_mbuf_from_socket(struct socket *so, struct label *socketlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_lomac *source, *dest;
source = SLOT(socketlabel);
dest = SLOT(mbuflabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_socket(struct ucred *cred, struct socket *socket,
struct label *socketlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(socketlabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_pipe(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_lomac *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(pipelabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_socket_from_socket(struct socket *oldsocket,
struct label *oldsocketlabel, struct socket *newsocket,
struct label *newsocketlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(oldsocketlabel);
dest = SLOT(newsocketlabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_relabel_socket(struct ucred *cred, struct socket *socket,
struct label *socketlabel, struct label *newlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(newlabel);
dest = SLOT(socketlabel);
try_relabel(source, dest);
}
static void
mac_lomac_relabel_pipe(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, struct label *newlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(newlabel);
dest = SLOT(pipelabel);
try_relabel(source, dest);
}
static void
mac_lomac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct label *mbuflabel,
struct socket *socket, struct label *socketpeerlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(mbuflabel);
dest = SLOT(socketpeerlabel);
mac_lomac_copy_single(source, dest);
}
/*
* Labeling event operations: network objects.
*/
static void
mac_lomac_set_socket_peer_from_socket(struct socket *oldsocket,
struct label *oldsocketlabel, struct socket *newsocket,
struct label *newsocketpeerlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(oldsocketlabel);
dest = SLOT(newsocketpeerlabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d,
struct label *bpflabel)
{
struct mac_lomac *source, *dest;
source = SLOT(&cred->cr_label);
dest = SLOT(bpflabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_ifnet(struct ifnet *ifnet, struct label *ifnetlabel)
{
char tifname[IFNAMSIZ], ifname[IFNAMSIZ], *p, *q;
char tiflist[sizeof(trusted_interfaces)];
struct mac_lomac *dest;
int len, grade;
dest = SLOT(ifnetlabel);
if (ifnet->if_type == IFT_LOOP) {
grade = MAC_LOMAC_TYPE_EQUAL;
goto set;
}
if (trust_all_interfaces) {
grade = MAC_LOMAC_TYPE_HIGH;
goto set;
}
grade = MAC_LOMAC_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;
snprintf(ifname, IFNAMSIZ, "%s%d", ifnet->if_name, ifnet->if_unit);
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, ifname) == 0) {
grade = MAC_LOMAC_TYPE_HIGH;
break;
}
}
else {
*p = '\0';
printf("MAC/LOMAC warning: interface name "
"\"%s\" is too long (must be < %d)\n",
q, IFNAMSIZ);
}
if (*p == '\0')
break;
q = p + 1;
}
}
set:
mac_lomac_set_single(dest, grade, 0);
mac_lomac_set_range(dest, grade, 0, grade, 0);
}
static void
mac_lomac_create_ipq(struct mbuf *fragment, struct label *fragmentlabel,
struct ipq *ipq, struct label *ipqlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(fragmentlabel);
dest = SLOT(ipqlabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel,
struct mbuf *datagram, struct label *datagramlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(ipqlabel);
dest = SLOT(datagramlabel);
/* Just use the head, since we require them all to match. */
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_fragment(struct mbuf *datagram, struct label *datagramlabel,
struct mbuf *fragment, struct label *fragmentlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(datagramlabel);
dest = SLOT(fragmentlabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_mbuf_from_mbuf(struct mbuf *oldmbuf,
struct label *oldmbuflabel, struct mbuf *newmbuf,
struct label *newmbuflabel)
{
struct mac_lomac *source, *dest;
source = SLOT(oldmbuflabel);
dest = SLOT(newmbuflabel);
/*
* Because the source mbuf may not yet have been "created",
* just initialized, we do a conditional copy. Since we don't
* allow mbufs to have ranges, do a KASSERT to make sure that
* doesn't happen.
*/
KASSERT((source->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0,
("mac_lomac_create_mbuf_from_mbuf: source mbuf has range"));
mac_lomac_copy(source, dest);
}
static void
mac_lomac_create_mbuf_linklayer(struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *mbuf, struct label *mbuflabel)
{
struct mac_lomac *dest;
dest = SLOT(mbuflabel);
mac_lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
}
static void
mac_lomac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct label *bpflabel,
struct mbuf *mbuf, struct label *mbuflabel)
{
struct mac_lomac *source, *dest;
source = SLOT(bpflabel);
dest = SLOT(mbuflabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_lomac *source, *dest;
source = SLOT(ifnetlabel);
dest = SLOT(mbuflabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_mbuf_multicast_encap(struct mbuf *oldmbuf,
struct label *oldmbuflabel, struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *newmbuf, struct label *newmbuflabel)
{
struct mac_lomac *source, *dest;
source = SLOT(oldmbuflabel);
dest = SLOT(newmbuflabel);
mac_lomac_copy_single(source, dest);
}
static void
mac_lomac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct label *oldmbuflabel,
struct mbuf *newmbuf, struct label *newmbuflabel)
{
struct mac_lomac *source, *dest;
source = SLOT(oldmbuflabel);
dest = SLOT(newmbuflabel);
mac_lomac_copy_single(source, dest);
}
static int
mac_lomac_fragment_match(struct mbuf *fragment, struct label *fragmentlabel,
struct ipq *ipq, struct label *ipqlabel)
{
struct mac_lomac *a, *b;
a = SLOT(ipqlabel);
b = SLOT(fragmentlabel);
return (mac_lomac_equal_single(a, b));
}
static void
mac_lomac_relabel_ifnet(struct ucred *cred, struct ifnet *ifnet,
struct label *ifnetlabel, struct label *newlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(newlabel);
dest = SLOT(ifnetlabel);
try_relabel(source, dest);
}
static void
mac_lomac_update_ipq(struct mbuf *fragment, struct label *fragmentlabel,
struct ipq *ipq, struct label *ipqlabel)
{
/* NOOP: we only accept matching labels, so no need to update */
}
/*
* Labeling event operations: processes.
*/
static void
mac_lomac_create_cred(struct ucred *cred_parent, struct ucred *cred_child)
{
struct mac_lomac *source, *dest;
source = SLOT(&cred_parent->cr_label);
dest = SLOT(&cred_child->cr_label);
mac_lomac_copy_single(source, dest);
mac_lomac_copy_range(source, dest);
}
static void
mac_lomac_execve_transition(struct ucred *old, struct ucred *new,
struct vnode *vp, struct label *vnodelabel,
struct label *interpvnodelabel, struct image_params *imgp,
struct label *execlabel)
{
struct mac_lomac *source, *dest, *obj, *robj;
source = SLOT(&old->cr_label);
dest = SLOT(&new->cr_label);
obj = SLOT(vnodelabel);
robj = interpvnodelabel != NULL ? SLOT(interpvnodelabel) : obj;
mac_lomac_copy(source, dest);
/*
* If there's an auxiliary label on the real object, respect it
* and assume that this level should be assumed immediately if
* a higher level is currently in place.
*/
if (robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
!mac_lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single)
&& mac_lomac_auxsingle_in_range(robj, dest))
mac_lomac_set_single(dest, robj->ml_auxsingle.mle_type,
robj->ml_auxsingle.mle_grade);
/*
* Restructuring to use the execve transitioning mechanism
* instead of the normal demotion mechanism here would be
* difficult, so just copy the label over and perform standard
* demotion. This is also non-optimal because it will result
* in the intermediate label "new" being created and immediately
* recycled.
*/
if (mac_lomac_enabled && revocation_enabled &&
!mac_lomac_dominate_single(obj, source))
(void)maybe_demote(source, obj, "executing", "file", vp);
}
static int
mac_lomac_execve_will_transition(struct ucred *old, struct vnode *vp,
struct label *vnodelabel, struct label *interpvnodelabel,
struct image_params *imgp, struct label *execlabel)
{
struct mac_lomac *subj, *obj, *robj;
if (!mac_lomac_enabled || !revocation_enabled)
return (0);
subj = SLOT(&old->cr_label);
obj = SLOT(vnodelabel);
robj = interpvnodelabel != NULL ? SLOT(interpvnodelabel) : obj;
return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
!mac_lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single)
&& mac_lomac_auxsingle_in_range(robj, subj)) ||
!mac_lomac_dominate_single(obj, subj));
}
static void
mac_lomac_create_proc0(struct ucred *cred)
{
struct mac_lomac *dest;
dest = SLOT(&cred->cr_label);
mac_lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
mac_lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH,
0);
}
static void
mac_lomac_create_proc1(struct ucred *cred)
{
struct mac_lomac *dest;
dest = SLOT(&cred->cr_label);
mac_lomac_set_single(dest, MAC_LOMAC_TYPE_HIGH, 0);
mac_lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH,
0);
}
static void
mac_lomac_relabel_cred(struct ucred *cred, struct label *newlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(newlabel);
dest = SLOT(&cred->cr_label);
try_relabel(source, dest);
}
/*
* Access control checks.
*/
static int
mac_lomac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct label *bpflabel,
struct ifnet *ifnet, struct label *ifnetlabel)
{
struct mac_lomac *a, *b;
if (!mac_lomac_enabled)
return (0);
a = SLOT(bpflabel);
b = SLOT(ifnetlabel);
if (mac_lomac_equal_single(a, b))
return (0);
return (EACCES);
}
static int
mac_lomac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
{
struct mac_lomac *subj, *new;
int error;
subj = SLOT(&cred->cr_label);
new = SLOT(newlabel);
/*
* If there is a LOMAC label update for the credential, it may
* be an update of the single, range, or both.
*/
error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
if (error)
return (error);
/*
* If the LOMAC label is to be changed, authorize as appropriate.
*/
if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
/*
* Fill in the missing parts from the previous label.
*/
if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
mac_lomac_copy_single(subj, new);
if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
mac_lomac_copy_range(subj, new);
/*
* To change the LOMAC range on a credential, the new
* range label must be in the current range.
*/
if (!mac_lomac_range_in_range(new, subj))
return (EPERM);
/*
* To change the LOMAC single label on a credential, the
* new single label must be in the new range. Implicitly
* from the previous check, the new single is in the old
* range.
*/
if (!mac_lomac_single_in_range(new, new))
return (EPERM);
/*
* To have EQUAL in any component of the new credential
* LOMAC label, the subject must already have EQUAL in
* their label.
*/
if (mac_lomac_contains_equal(new)) {
error = mac_lomac_subject_privileged(subj);
if (error)
return (error);
}
/*
* XXXMAC: Additional consistency tests regarding the
* single and range of the new label might be performed
* here.
*/
}
return (0);
}
static int
mac_lomac_check_cred_visible(struct ucred *u1, struct ucred *u2)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&u1->cr_label);
obj = SLOT(&u2->cr_label);
/* XXX: range */
if (!mac_lomac_dominate_single(obj, subj))
return (ESRCH);
return (0);
}
static int
mac_lomac_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifnet,
struct label *ifnetlabel, struct label *newlabel)
{
struct mac_lomac *subj, *new;
int error;
subj = SLOT(&cred->cr_label);
new = SLOT(newlabel);
/*
* If there is a LOMAC label update for the interface, it may
* be an update of the single, range, or both.
*/
error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
if (error)
return (error);
/*
* Relabling network interfaces requires LOMAC privilege.
*/
error = mac_lomac_subject_privileged(subj);
if (error)
return (error);
/*
* If the LOMAC label is to be changed, authorize as appropriate.
*/
if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
/*
* Fill in the missing parts from the previous label.
*/
if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
mac_lomac_copy_single(subj, new);
if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
mac_lomac_copy_range(subj, new);
/*
* Rely on the traditional superuser status for the LOMAC
* interface relabel requirements. XXXMAC: This will go
* away.
*/
error = suser_cred(cred, 0);
if (error)
return (EPERM);
/*
* XXXMAC: Additional consistency tests regarding the single
* and the range of the new label might be performed here.
*/
}
return (0);
}
static int
mac_lomac_check_ifnet_transmit(struct ifnet *ifnet, struct label *ifnetlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_lomac *p, *i;
if (!mac_lomac_enabled)
return (0);
p = SLOT(mbuflabel);
i = SLOT(ifnetlabel);
return (mac_lomac_single_in_range(p, i) ? 0 : EACCES);
}
static int
mac_lomac_check_kld_load(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (mac_lomac_subject_privileged(subj))
return (EPERM);
if (!mac_lomac_high_single(obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_kld_unload(struct ucred *cred)
{
struct mac_lomac *subj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
if (mac_lomac_subject_privileged(subj))
return (EPERM);
return (0);
}
static int
mac_lomac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, unsigned long cmd, void /* caddr_t */ *data)
{
if(!mac_lomac_enabled)
return (0);
/* XXX: This will be implemented soon... */
return (0);
}
static int
mac_lomac_check_pipe_read(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_lomac_dominate_single(obj, subj))
return (maybe_demote(subj, obj, "reading", "pipe", NULL));
return (0);
}
static int
mac_lomac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel, struct label *newlabel)
{
struct mac_lomac *subj, *obj, *new;
int error;
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
obj = SLOT(pipelabel);
/*
* If there is a LOMAC label update for a pipe, it must be a
* single update.
*/
error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
if (error)
return (error);
/*
* To perform a relabel of a pipe (LOMAC label or not), LOMAC must
* authorize the relabel.
*/
if (!mac_lomac_single_in_range(obj, subj))
return (EPERM);
/*
* If the LOMAC label is to be changed, authorize as appropriate.
*/
if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
/*
* To change the LOMAC label on a pipe, the new pipe label
* must be in the subject range.
*/
if (!mac_lomac_single_in_range(new, subj))
return (EPERM);
/*
* To change the LOMAC label on a pipe to be EQUAL, the
* subject must have appropriate privilege.
*/
if (mac_lomac_contains_equal(new)) {
error = mac_lomac_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mac_lomac_check_pipe_write(struct ucred *cred, struct pipe *pipe,
struct label *pipelabel)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT((pipelabel));
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_proc_debug(struct ucred *cred, struct proc *proc)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(&proc->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_lomac_dominate_single(obj, subj))
return (ESRCH);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_proc_sched(struct ucred *cred, struct proc *proc)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(&proc->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_lomac_dominate_single(obj, subj))
return (ESRCH);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(&proc->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_lomac_dominate_single(obj, subj))
return (ESRCH);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_socket_deliver(struct socket *so, struct label *socketlabel,
struct mbuf *m, struct label *mbuflabel)
{
struct mac_lomac *p, *s;
if (!mac_lomac_enabled)
return (0);
p = SLOT(mbuflabel);
s = SLOT(socketlabel);
return (mac_lomac_equal_single(p, s) ? 0 : EACCES);
}
static int
mac_lomac_check_socket_relabel(struct ucred *cred, struct socket *socket,
struct label *socketlabel, struct label *newlabel)
{
struct mac_lomac *subj, *obj, *new;
int error;
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
obj = SLOT(socketlabel);
/*
* If there is a LOMAC label update for the socket, it may be
* an update of single.
*/
error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
if (error)
return (error);
/*
* To relabel a socket, the old socket single must be in the subject
* range.
*/
if (!mac_lomac_single_in_range(obj, subj))
return (EPERM);
/*
* If the LOMAC label is to be changed, authorize as appropriate.
*/
if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
/*
* To relabel a socket, the new socket single must be in
* the subject range.
*/
if (!mac_lomac_single_in_range(new, subj))
return (EPERM);
/*
* To change the LOMAC label on the socket to contain EQUAL,
* the subject must have appropriate privilege.
*/
if (mac_lomac_contains_equal(new)) {
error = mac_lomac_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mac_lomac_check_socket_visible(struct ucred *cred, struct socket *socket,
struct label *socketlabel)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(socketlabel);
if (!mac_lomac_dominate_single(obj, subj))
return (ENOENT);
return (0);
}
static int
mac_lomac_check_system_swapon(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (mac_lomac_subject_privileged(subj))
return (EPERM);
if (!mac_lomac_high_single(obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_system_sysctl(struct ucred *cred, int *name, u_int namelen,
void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen)
{
struct mac_lomac *subj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
/*
* In general, treat sysctl variables as lomac/high, but also
* require privilege to change them, since they are a
* communications channel between grades. Exempt MIB
* queries from this due to undocmented sysctl magic.
* XXXMAC: This probably requires some more review.
*/
if (new != NULL) {
if (namelen > 0 && name[0] == 0)
return (0);
#ifdef notdef
if (!mac_lomac_subject_dominate_high(subj))
return (EACCES);
#endif
if (mac_lomac_subject_privileged(subj))
return (EPERM);
}
return (0);
}
static int
mac_lomac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct componentname *cnp, struct vattr *vap)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
if (obj->ml_flags & MAC_LOMAC_FLAG_AUX &&
!mac_lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_delete(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct vnode *vp, struct label *label,
struct componentname *cnp)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
obj = SLOT(label);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
struct label *label, acl_type_t type)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct vnode *vp, struct label *label,
struct componentname *cnp)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
obj = SLOT(label);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_mmap(struct ucred *cred, struct vnode *vp,
struct label *label, int prot)
{
struct mac_lomac *subj, *obj;
/*
* Rely on the use of open()-time protections to handle
* non-revocation cases.
*/
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (prot & VM_PROT_WRITE) {
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
}
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
if (!mac_lomac_dominate_single(obj, subj))
return (maybe_demote(subj, obj, "mapping", "file", vp));
}
return (0);
}
static int
mac_lomac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp,
struct label *label, int prot)
{
struct mac_lomac *subj, *obj;
/*
* Rely on the use of open()-time protections to handle
* non-revocation cases.
*/
if (!mac_lomac_enabled || !revocation_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (prot & VM_PROT_WRITE) {
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
}
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
if (!mac_lomac_dominate_single(obj, subj))
return (EACCES);
}
return (0);
}
static void
mac_lomac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp,
struct label *label, /* XXX vm_prot_t */ int *prot)
{
struct mac_lomac *subj, *obj;
/*
* Rely on the use of open()-time protections to handle
* non-revocation cases.
*/
if (!mac_lomac_enabled || !revocation_enabled)
return;
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_lomac_subject_dominate(subj, obj))
*prot &= ~VM_PROT_WRITE;
}
static int
mac_lomac_check_vnode_open(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, int acc_mode)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
/* XXX privilege override for admin? */
if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_lomac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *label)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled || !revocation_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(label);
if (!mac_lomac_dominate_single(obj, subj))
return (maybe_demote(subj, obj, "reading", "file", vp));
return (0);
}
static int
mac_lomac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, struct label *newlabel)
{
struct mac_lomac *old, *new, *subj;
int error;
old = SLOT(vnodelabel);
new = SLOT(newlabel);
subj = SLOT(&cred->cr_label);
/*
* If there is a LOMAC label update for the vnode, it must be a
* single label, with an optional explicit auxiliary single.
*/
error = lomac_atmostflags(new,
MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX);
if (error)
return (error);
/*
* To perform a relabel of the vnode (LOMAC label or not), LOMAC must
* authorize the relabel.
*/
if (!mac_lomac_single_in_range(old, subj))
return (EPERM);
/*
* If the LOMAC label is to be changed, authorize as appropriate.
*/
if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
/*
* To change the LOMAC label on a vnode, the new vnode label
* must be in the subject range.
*/
if (!mac_lomac_single_in_range(new, subj))
return (EPERM);
/*
* To change the LOMAC label on the vnode to be EQUAL,
* the subject must have appropriate privilege.
*/
if (mac_lomac_contains_equal(new)) {
error = mac_lomac_subject_privileged(subj);
if (error)
return (error);
}
}
if (new->ml_flags & MAC_LOMAC_FLAG_AUX) {
/*
* Fill in the missing parts from the previous label.
*/
if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
mac_lomac_copy_single(subj, new);
/*
* To change the auxiliary LOMAC label on a vnode, the new
* vnode label must be in the subject range.
*/
if (!mac_lomac_auxsingle_in_range(new, subj))
return (EPERM);
/*
* To change the auxiliary LOMAC label on the vnode to be
* EQUAL, the subject must have appropriate privilege.
*/
if (mac_lomac_contains_equal(new)) {
error = mac_lomac_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mac_lomac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct vnode *vp, struct label *label,
struct componentname *cnp)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
obj = SLOT(label);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
struct label *dlabel, struct vnode *vp, struct label *label, int samedir,
struct componentname *cnp)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(dlabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
if (vp != NULL) {
obj = SLOT(label);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_lomac_check_vnode_revoke(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_setacl(struct ucred *cred, struct vnode *vp,
struct label *label, acl_type_t type, struct acl *acl)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(label);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, int attrnamespace, const char *name,
struct uio *uio)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
/* XXX: protect the MAC EA in a special way? */
return (0);
}
static int
mac_lomac_check_vnode_setflags(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, u_long flags)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_setmode(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, mode_t mode)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_setowner(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, uid_t uid, gid_t gid)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
struct label *vnodelabel, struct timespec atime, struct timespec mtime)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled)
return (0);
subj = SLOT(&cred->cr_label);
obj = SLOT(vnodelabel);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
mac_lomac_check_vnode_write(struct ucred *active_cred,
struct ucred *file_cred, struct vnode *vp, struct label *label)
{
struct mac_lomac *subj, *obj;
if (!mac_lomac_enabled || !revocation_enabled)
return (0);
subj = SLOT(&active_cred->cr_label);
obj = SLOT(label);
if (!mac_lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static void
mac_lomac_thread_userret(struct thread *td)
{
struct proc *p = td->td_proc;
struct mac_lomac_proc *subj = PSLOT(&p->p_label);
struct ucred *newcred, *oldcred;
int dodrop;
mtx_lock(&subj->mtx);
if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
dodrop = 0;
mtx_unlock(&subj->mtx);
newcred = crget();
/*
* Prevent a lock order reversal in
* mac_cred_mmapped_drop_perms; ideally, the other
* user of subj->mtx wouldn't be holding Giant.
*/
mtx_lock(&Giant);
PROC_LOCK(p);
mtx_lock(&subj->mtx);
/*
* Check if we lost the race while allocating the cred.
*/
if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) {
crfree(newcred);
goto out;
}
oldcred = p->p_ucred;
crcopy(newcred, oldcred);
crhold(newcred);
mac_lomac_copy(&subj->mac_lomac, SLOT(&newcred->cr_label));
p->p_ucred = newcred;
crfree(oldcred);
dodrop = 1;
out:
mtx_unlock(&subj->mtx);
PROC_UNLOCK(p);
if (dodrop)
mac_cred_mmapped_drop_perms(curthread, newcred);
mtx_unlock(&Giant);
} else {
mtx_unlock(&subj->mtx);
}
}
static struct mac_policy_ops mac_lomac_ops =
{
.mpo_destroy = mac_lomac_destroy,
.mpo_init = mac_lomac_init,
.mpo_init_bpfdesc_label = mac_lomac_init_label,
.mpo_init_cred_label = mac_lomac_init_label,
.mpo_init_devfsdirent_label = mac_lomac_init_label,
.mpo_init_ifnet_label = mac_lomac_init_label,
.mpo_init_ipq_label = mac_lomac_init_label_waitcheck,
.mpo_init_mbuf_label = mac_lomac_init_label_waitcheck,
.mpo_init_mount_label = mac_lomac_init_label,
.mpo_init_mount_fs_label = mac_lomac_init_label,
.mpo_init_pipe_label = mac_lomac_init_label,
.mpo_init_proc_label = mac_lomac_init_proc_label,
.mpo_init_socket_label = mac_lomac_init_label_waitcheck,
.mpo_init_socket_peer_label = mac_lomac_init_label_waitcheck,
.mpo_init_vnode_label = mac_lomac_init_label,
.mpo_destroy_bpfdesc_label = mac_lomac_destroy_label,
.mpo_destroy_cred_label = mac_lomac_destroy_label,
.mpo_destroy_devfsdirent_label = mac_lomac_destroy_label,
.mpo_destroy_ifnet_label = mac_lomac_destroy_label,
.mpo_destroy_ipq_label = mac_lomac_destroy_label,
.mpo_destroy_mbuf_label = mac_lomac_destroy_label,
.mpo_destroy_mount_label = mac_lomac_destroy_label,
.mpo_destroy_mount_fs_label = mac_lomac_destroy_label,
.mpo_destroy_pipe_label = mac_lomac_destroy_label,
.mpo_destroy_proc_label = mac_lomac_destroy_proc_label,
.mpo_destroy_socket_label = mac_lomac_destroy_label,
.mpo_destroy_socket_peer_label = mac_lomac_destroy_label,
.mpo_destroy_vnode_label = mac_lomac_destroy_label,
.mpo_copy_mbuf_label = mac_lomac_copy_label,
.mpo_copy_pipe_label = mac_lomac_copy_label,
.mpo_copy_vnode_label = mac_lomac_copy_label,
.mpo_externalize_cred_label = mac_lomac_externalize_label,
.mpo_externalize_ifnet_label = mac_lomac_externalize_label,
.mpo_externalize_pipe_label = mac_lomac_externalize_label,
.mpo_externalize_socket_label = mac_lomac_externalize_label,
.mpo_externalize_socket_peer_label = mac_lomac_externalize_label,
.mpo_externalize_vnode_label = mac_lomac_externalize_label,
.mpo_internalize_cred_label = mac_lomac_internalize_label,
.mpo_internalize_ifnet_label = mac_lomac_internalize_label,
.mpo_internalize_pipe_label = mac_lomac_internalize_label,
.mpo_internalize_socket_label = mac_lomac_internalize_label,
.mpo_internalize_vnode_label = mac_lomac_internalize_label,
.mpo_create_devfs_device = mac_lomac_create_devfs_device,
.mpo_create_devfs_directory = mac_lomac_create_devfs_directory,
.mpo_create_devfs_symlink = mac_lomac_create_devfs_symlink,
.mpo_create_mount = mac_lomac_create_mount,
.mpo_create_root_mount = mac_lomac_create_root_mount,
.mpo_relabel_vnode = mac_lomac_relabel_vnode,
.mpo_update_devfsdirent = mac_lomac_update_devfsdirent,
.mpo_associate_vnode_devfs = mac_lomac_associate_vnode_devfs,
.mpo_associate_vnode_extattr = mac_lomac_associate_vnode_extattr,
.mpo_associate_vnode_singlelabel =
mac_lomac_associate_vnode_singlelabel,
.mpo_create_vnode_extattr = mac_lomac_create_vnode_extattr,
.mpo_setlabel_vnode_extattr = mac_lomac_setlabel_vnode_extattr,
.mpo_create_mbuf_from_socket = mac_lomac_create_mbuf_from_socket,
.mpo_create_pipe = mac_lomac_create_pipe,
.mpo_create_socket = mac_lomac_create_socket,
.mpo_create_socket_from_socket = mac_lomac_create_socket_from_socket,
.mpo_relabel_pipe = mac_lomac_relabel_pipe,
.mpo_relabel_socket = mac_lomac_relabel_socket,
.mpo_set_socket_peer_from_mbuf = mac_lomac_set_socket_peer_from_mbuf,
.mpo_set_socket_peer_from_socket =
mac_lomac_set_socket_peer_from_socket,
.mpo_create_bpfdesc = mac_lomac_create_bpfdesc,
.mpo_create_datagram_from_ipq = mac_lomac_create_datagram_from_ipq,
.mpo_create_fragment = mac_lomac_create_fragment,
.mpo_create_ifnet = mac_lomac_create_ifnet,
.mpo_create_ipq = mac_lomac_create_ipq,
.mpo_create_mbuf_from_mbuf = mac_lomac_create_mbuf_from_mbuf,
.mpo_create_mbuf_linklayer = mac_lomac_create_mbuf_linklayer,
.mpo_create_mbuf_from_bpfdesc = mac_lomac_create_mbuf_from_bpfdesc,
.mpo_create_mbuf_from_ifnet = mac_lomac_create_mbuf_from_ifnet,
.mpo_create_mbuf_multicast_encap =
mac_lomac_create_mbuf_multicast_encap,
.mpo_create_mbuf_netlayer = mac_lomac_create_mbuf_netlayer,
.mpo_fragment_match = mac_lomac_fragment_match,
.mpo_relabel_ifnet = mac_lomac_relabel_ifnet,
.mpo_update_ipq = mac_lomac_update_ipq,
.mpo_create_cred = mac_lomac_create_cred,
.mpo_execve_transition = mac_lomac_execve_transition,
.mpo_execve_will_transition = mac_lomac_execve_will_transition,
.mpo_create_proc0 = mac_lomac_create_proc0,
.mpo_create_proc1 = mac_lomac_create_proc1,
.mpo_relabel_cred = mac_lomac_relabel_cred,
.mpo_check_bpfdesc_receive = mac_lomac_check_bpfdesc_receive,
.mpo_check_cred_relabel = mac_lomac_check_cred_relabel,
.mpo_check_cred_visible = mac_lomac_check_cred_visible,
.mpo_check_ifnet_relabel = mac_lomac_check_ifnet_relabel,
.mpo_check_ifnet_transmit = mac_lomac_check_ifnet_transmit,
.mpo_check_kld_load = mac_lomac_check_kld_load,
.mpo_check_kld_unload = mac_lomac_check_kld_unload,
.mpo_check_pipe_ioctl = mac_lomac_check_pipe_ioctl,
.mpo_check_pipe_read = mac_lomac_check_pipe_read,
.mpo_check_pipe_relabel = mac_lomac_check_pipe_relabel,
.mpo_check_pipe_write = mac_lomac_check_pipe_write,
.mpo_check_proc_debug = mac_lomac_check_proc_debug,
.mpo_check_proc_sched = mac_lomac_check_proc_sched,
.mpo_check_proc_signal = mac_lomac_check_proc_signal,
.mpo_check_socket_deliver = mac_lomac_check_socket_deliver,
.mpo_check_socket_relabel = mac_lomac_check_socket_relabel,
.mpo_check_socket_visible = mac_lomac_check_socket_visible,
.mpo_check_system_swapon = mac_lomac_check_system_swapon,
.mpo_check_system_sysctl = mac_lomac_check_system_sysctl,
.mpo_check_vnode_access = mac_lomac_check_vnode_open,
.mpo_check_vnode_create = mac_lomac_check_vnode_create,
.mpo_check_vnode_delete = mac_lomac_check_vnode_delete,
.mpo_check_vnode_deleteacl = mac_lomac_check_vnode_deleteacl,
.mpo_check_vnode_link = mac_lomac_check_vnode_link,
.mpo_check_vnode_mmap = mac_lomac_check_vnode_mmap,
.mpo_check_vnode_mmap_downgrade = mac_lomac_check_vnode_mmap_downgrade,
.mpo_check_vnode_mprotect = mac_lomac_check_vnode_mprotect,
.mpo_check_vnode_open = mac_lomac_check_vnode_open,
.mpo_check_vnode_read = mac_lomac_check_vnode_read,
.mpo_check_vnode_relabel = mac_lomac_check_vnode_relabel,
.mpo_check_vnode_rename_from = mac_lomac_check_vnode_rename_from,
.mpo_check_vnode_rename_to = mac_lomac_check_vnode_rename_to,
.mpo_check_vnode_revoke = mac_lomac_check_vnode_revoke,
.mpo_check_vnode_setacl = mac_lomac_check_vnode_setacl,
.mpo_check_vnode_setextattr = mac_lomac_check_vnode_setextattr,
.mpo_check_vnode_setflags = mac_lomac_check_vnode_setflags,
.mpo_check_vnode_setmode = mac_lomac_check_vnode_setmode,
.mpo_check_vnode_setowner = mac_lomac_check_vnode_setowner,
.mpo_check_vnode_setutimes = mac_lomac_check_vnode_setutimes,
.mpo_check_vnode_write = mac_lomac_check_vnode_write,
.mpo_thread_userret = mac_lomac_thread_userret,
};
MAC_POLICY_SET(&mac_lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC",
MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &mac_lomac_slot);
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