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freebsd-dev/sys/security/mac_lomac/mac_lomac.c
Robert Watson 5e7ce4785f Modify the mac_init_ipq() MAC Framework entry point to accept an 
additional flags argument to indicate blocking disposition, and
pass in M_NOWAIT from the IP reassembly code to indicate that
blocking is not OK when labeling a new IP fragment reassembly
queue.  This should eliminate some of the WITNESS warnings that
have started popping up since fine-grained IP stack locking
started going in; if memory allocation fails, the creation of
the fragment queue will be aborted.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories
2003-03-26 15:12:03 +00:00

2738 lines
68 KiB
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/*-
* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
* Copyright (c) 2001, 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* This software was developed for the FreeBSD Project in part by 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/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));
return (1);
}
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(char *string, size_t size,
size_t *caller_len, 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 vattr va;
static char xxx[] = "<<XXX>>";
struct mac_lomac_proc *subj = PSLOT(&curthread->td_proc->p_label);
char *subjlabeltext, *objlabeltext, *subjtext, *text;
struct proc *p;
size_t len;
pid_t pgid;
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);
subjtext = subjlabeltext = objlabeltext = xxx;
if (mac_lomac_to_string(NULL, 0, &len, &subj->mac_lomac) == 0 &&
(text = malloc(len + 1, M_MACLOMAC, M_NOWAIT)) != NULL) {
if (mac_lomac_to_string(text, len + 1, &len,
&subj->mac_lomac) == 0)
subjtext = text;
else
free(text, M_MACLOMAC);
}
mtx_unlock(&subj->mtx);
if (mac_lomac_to_string(NULL, 0, &len, subjlabel) == 0 &&
(text = malloc(len + 1, M_MACLOMAC, M_NOWAIT)) != NULL) {
if (mac_lomac_to_string(text, len + 1, &len,
subjlabel) == 0)
subjlabeltext = text;
else
free(text, M_MACLOMAC);
}
if (mac_lomac_to_string(NULL, 0, &len, objlabel) == 0 &&
(text = malloc(len + 1, M_MACLOMAC, M_NOWAIT)) != NULL) {
if (mac_lomac_to_string(text, len + 1, &len,
objlabel) == 0)
objlabeltext = text;
else
free(text, M_MACLOMAC);
}
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);
}
if (subjlabeltext != xxx)
free(subjlabeltext, M_MACLOMAC);
if (objlabeltext != xxx)
free(objlabeltext, M_MACLOMAC);
if (subjtext != xxx)
free(subjtext, M_MACLOMAC);
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;
}
/*
* mac_lomac_element_to_string() is basically an snprintf wrapper with
* the same properties as snprintf(). It returns the length it would
* have added to the string in the event the string is too short.
*/
static size_t
mac_lomac_element_to_string(char *string, size_t size,
struct mac_lomac_element *element)
{
switch (element->mle_type) {
case MAC_LOMAC_TYPE_HIGH:
return (snprintf(string, size, "high"));
case MAC_LOMAC_TYPE_LOW:
return (snprintf(string, size, "low"));
case MAC_LOMAC_TYPE_EQUAL:
return (snprintf(string, size, "equal"));
case MAC_LOMAC_TYPE_GRADE:
return (snprintf(string, size, "%d", element->mle_grade));
default:
panic("mac_lomac_element_to_string: invalid type (%d)",
element->mle_type);
}
}
static int
mac_lomac_to_string(char *string, size_t size, size_t *caller_len,
struct mac_lomac *mac_lomac)
{
size_t left, len, curlen;
char *curptr;
/*
* Also accept NULL string to allow for predetermination of total
* string length.
*/
if (string != NULL)
bzero(string, size);
else if (size != 0)
return (EINVAL);
curptr = string;
left = size;
curlen = 0;
#define INCLEN(length, leftover) do { \
if (string != NULL) { \
if (length >= leftover) \
return (EINVAL); \
leftover -= length; \
curptr += length; \
} \
curlen += length; \
} while (0)
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
len = mac_lomac_element_to_string(curptr, left,
&mac_lomac->ml_single);
INCLEN(len, left);
}
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX) {
len = snprintf(curptr, left, "[");
INCLEN(len, left);
len = mac_lomac_element_to_string(curptr, left,
&mac_lomac->ml_auxsingle);
INCLEN(len, left);
len = snprintf(curptr, left, "]");
INCLEN(len, left);
}
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
len = snprintf(curptr, left, "(");
INCLEN(len, left);
len = mac_lomac_element_to_string(curptr, left,
&mac_lomac->ml_rangelow);
INCLEN(len, left);
len = snprintf(curptr, left, "-");
INCLEN(len, left);
len = mac_lomac_element_to_string(curptr, left,
&mac_lomac->ml_rangehigh);
INCLEN(len, left);
len = snprintf(curptr, left, ")");
INCLEN(len, left);
}
#undef INCLEN
*caller_len = curlen;
return (0);
}
static int
mac_lomac_externalize_label(struct label *label, char *element_name,
char *element_data, size_t size, size_t *len, int *claimed)
{
struct mac_lomac *mac_lomac;
int error;
if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
mac_lomac = SLOT(label);
error = mac_lomac_to_string(element_data, size, len, mac_lomac);
if (error)
return (error);
*len = strlen(element_data);
return (0);
}
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) {
/*
* To change the LOMAC single label on a credential, the
* new single label must be in the current range.
*/
if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE &&
!mac_lomac_single_in_range(new, subj))
return (EPERM);
/*
* To change the LOMAC range on a credential, the new
* range label must be in the current range.
*/
if (new->ml_flags & MAC_LOMAC_FLAG_RANGE &&
!mac_lomac_range_in_range(new, subj))
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) {
/*
* 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) {
/*
* 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_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, &mac_lomac_slot);
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