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freebsd-skq/sys/security/mac_lomac/mac_lomac.c
rwatson 787cf8d03f Update device-labeling logic for Biba, LOMAC, and MLS to recognize new-style 
pts devices when various policy ptys_equal flags are enabled.

Submitted by:	Estella Mystagic <estella at mystagic.com>
MFC after:	1 week
2010-03-02 15:05:48 +00:00

3086 lines
72 KiB
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/*-
* Copyright (c) 1999-2002, 2007-2009 Robert N. M. Watson
* Copyright (c) 2001-2005 Networks Associates Technology, Inc.
* Copyright (c) 2006 SPARTA, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* This software was developed for the FreeBSD Project in part by 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.
*
* This software was enhanced by SPARTA ISSO under SPAWAR contract
* N66001-04-C-6019 ("SEFOS").
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Developed by the TrustedBSD Project.
*
* 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/malloc.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/sysent.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sx.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/in_pcb.h>
#include <netinet/ip_var.h>
#include <vm/vm.h>
#include <security/mac/mac_policy.h>
#include <security/mac/mac_framework.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 lomac_label_size = sizeof(struct mac_lomac);
SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD,
&lomac_label_size, 0, "Size of struct mac_lomac");
static int lomac_enabled = 1;
SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RW,
&lomac_enabled, 0, "Enforce MAC/LOMAC policy");
TUNABLE_INT("security.mac.lomac.enabled", &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 lomac_slot;
#define SLOT(l) ((struct mac_lomac *)mac_label_get((l), lomac_slot))
#define SLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val))
#define PSLOT(l) ((struct mac_lomac_proc *) \
mac_label_get((l), lomac_slot))
#define PSLOT_SET(l, val) mac_label_set((l), lomac_slot, (uintptr_t)(val))
MALLOC_DEFINE(M_LOMAC, "mac_lomac_label", "MAC/LOMAC labels");
static struct mac_lomac *
lomac_alloc(int flag)
{
struct mac_lomac *ml;
ml = malloc(sizeof(*ml), M_LOMAC, M_ZERO | flag);
return (ml);
}
static void
lomac_free(struct mac_lomac *ml)
{
if (ml != NULL)
free(ml, M_LOMAC);
else
atomic_add_int(&destroyed_not_inited, 1);
}
static int
lomac_atmostflags(struct mac_lomac *ml, int flags)
{
if ((ml->ml_flags & flags) != ml->ml_flags)
return (EINVAL);
return (0);
}
static int
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("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("lomac_dominate_element: b->mle_type invalid");
}
default:
panic("lomac_dominate_element: a->mle_type invalid");
}
}
static int
lomac_range_in_range(struct mac_lomac *rangea, struct mac_lomac *rangeb)
{
return (lomac_dominate_element(&rangeb->ml_rangehigh,
&rangea->ml_rangehigh) &&
lomac_dominate_element(&rangea->ml_rangelow,
&rangeb->ml_rangelow));
}
static int
lomac_single_in_range(struct mac_lomac *single, struct mac_lomac *range)
{
KASSERT((single->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("lomac_single_in_range: a not single"));
KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
("lomac_single_in_range: b not range"));
return (lomac_dominate_element(&range->ml_rangehigh,
&single->ml_single) && lomac_dominate_element(&single->ml_single,
&range->ml_rangelow));
}
static int
lomac_auxsingle_in_range(struct mac_lomac *single, struct mac_lomac *range)
{
KASSERT((single->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
("lomac_single_in_range: a not auxsingle"));
KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
("lomac_single_in_range: b not range"));
return (lomac_dominate_element(&range->ml_rangehigh,
&single->ml_auxsingle) &&
lomac_dominate_element(&single->ml_auxsingle,
&range->ml_rangelow));
}
static int
lomac_dominate_single(struct mac_lomac *a, struct mac_lomac *b)
{
KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("lomac_dominate_single: a not single"));
KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("lomac_dominate_single: b not single"));
return (lomac_dominate_element(&a->ml_single, &b->ml_single));
}
static int
lomac_subject_dominate(struct mac_lomac *a, struct mac_lomac *b)
{
KASSERT((~a->ml_flags &
(MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)) == 0,
("lomac_dominate_single: a not subject"));
KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("lomac_dominate_single: b not single"));
return (lomac_dominate_element(&a->ml_rangehigh, &b->ml_single));
}
static int
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
lomac_equal_single(struct mac_lomac *a, struct mac_lomac *b)
{
KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("lomac_equal_single: a not single"));
KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("lomac_equal_single: b not single"));
return (lomac_equal_element(&a->ml_single, &b->ml_single));
}
static int
lomac_contains_equal(struct mac_lomac *ml)
{
if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE)
if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (1);
if (ml->ml_flags & MAC_LOMAC_FLAG_AUX)
if (ml->ml_auxsingle.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (1);
if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) {
if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (1);
if (ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (1);
}
return (0);
}
static int
lomac_subject_privileged(struct mac_lomac *ml)
{
KASSERT((ml->ml_flags & MAC_LOMAC_FLAGS_BOTH) ==
MAC_LOMAC_FLAGS_BOTH,
("lomac_subject_privileged: subject doesn't have both labels"));
/* If the single is EQUAL, it's ok. */
if (ml->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (0);
/* If either range endpoint is EQUAL, it's ok. */
if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL ||
ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
return (0);
/* If the range is low-high, it's ok. */
if (ml->ml_rangelow.mle_type == MAC_LOMAC_TYPE_LOW &&
ml->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_HIGH)
return (0);
/* It's not ok. */
return (EPERM);
}
static int
lomac_high_single(struct mac_lomac *ml)
{
KASSERT((ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("lomac_high_single: mac_lomac not single"));
return (ml->ml_single.mle_type == MAC_LOMAC_TYPE_HIGH);
}
static int
lomac_valid(struct mac_lomac *ml)
{
if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
switch (ml->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 (ml->ml_single.mle_type != MAC_LOMAC_TYPE_UNDEF)
return (EINVAL);
}
if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) {
switch (ml->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 (ml->ml_auxsingle.mle_type != MAC_LOMAC_TYPE_UNDEF)
return (EINVAL);
}
if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) {
switch (ml->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 (ml->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 (!lomac_dominate_element(&ml->ml_rangehigh,
&ml->ml_rangelow))
return (EINVAL);
} else {
if (ml->ml_rangelow.mle_type != MAC_LOMAC_TYPE_UNDEF ||
ml->ml_rangehigh.mle_type != MAC_LOMAC_TYPE_UNDEF)
return (EINVAL);
}
return (0);
}
static void
lomac_set_range(struct mac_lomac *ml, u_short typelow, u_short gradelow,
u_short typehigh, u_short gradehigh)
{
ml->ml_rangelow.mle_type = typelow;
ml->ml_rangelow.mle_grade = gradelow;
ml->ml_rangehigh.mle_type = typehigh;
ml->ml_rangehigh.mle_grade = gradehigh;
ml->ml_flags |= MAC_LOMAC_FLAG_RANGE;
}
static void
lomac_set_single(struct mac_lomac *ml, u_short type, u_short grade)
{
ml->ml_single.mle_type = type;
ml->ml_single.mle_grade = grade;
ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
}
static void
lomac_copy_range(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
{
KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
("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
lomac_copy_single(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
{
KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
("lomac_copy_single: labelfrom not single"));
labelto->ml_single = labelfrom->ml_single;
labelto->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
}
static void
lomac_copy_auxsingle(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
{
KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
("lomac_copy_auxsingle: labelfrom not auxsingle"));
labelto->ml_auxsingle = labelfrom->ml_auxsingle;
labelto->ml_flags |= MAC_LOMAC_FLAG_AUX;
}
static void
lomac_copy(struct mac_lomac *source, struct mac_lomac *dest)
{
if (source->ml_flags & MAC_LOMAC_FLAG_SINGLE)
lomac_copy_single(source, dest);
if (source->ml_flags & MAC_LOMAC_FLAG_AUX)
lomac_copy_auxsingle(source, dest);
if (source->ml_flags & MAC_LOMAC_FLAG_RANGE)
lomac_copy_range(source, dest);
}
static int lomac_to_string(struct sbuf *sb, struct mac_lomac *ml);
static int
maybe_demote(struct mac_lomac *subjlabel, struct mac_lomac *objlabel,
const char *actionname, const char *objname, struct vnode *vp)
{
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 (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.
*/
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.
*/
lomac_copy_range(subjlabel, &subj->mac_lomac);
if (!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;
thread_lock(curthread);
curthread->td_flags |= TDF_ASTPENDING | TDF_MACPEND;
thread_unlock(curthread);
/*
* Avoid memory allocation while holding a mutex; cache the label.
*/
lomac_copy_single(&subj->mac_lomac, &cached_subjlabel);
mtx_unlock(&subj->mtx);
sbuf_new(&subjlabel_sb, NULL, 0, SBUF_AUTOEXTEND);
lomac_to_string(&subjlabel_sb, subjlabel);
sbuf_finish(&subjlabel_sb);
subjlabeltext = sbuf_data(&subjlabel_sb);
sbuf_new(&subjtext_sb, NULL, 0, SBUF_AUTOEXTEND);
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);
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 (vp != NULL && VOP_GETATTR(vp, &va, curthread->td_ucred) == 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, vp->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));
lomac_copy(from, to);
}
}
/*
* Policy module operations.
*/
static void
lomac_init(struct mac_policy_conf *conf)
{
}
/*
* Label operations.
*/
static void
lomac_init_label(struct label *label)
{
SLOT_SET(label, lomac_alloc(M_WAITOK));
}
static int
lomac_init_label_waitcheck(struct label *label, int flag)
{
SLOT_SET(label, lomac_alloc(flag));
if (SLOT(label) == NULL)
return (ENOMEM);
return (0);
}
static void
lomac_destroy_label(struct label *label)
{
lomac_free(SLOT(label));
SLOT_SET(label, NULL);
}
static int
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("lomac_element_to_string: invalid type (%d)",
element->mle_type);
}
}
static int
lomac_to_string(struct sbuf *sb, struct mac_lomac *ml)
{
if (ml->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
if (lomac_element_to_string(sb, &ml->ml_single) == -1)
return (EINVAL);
}
if (ml->ml_flags & MAC_LOMAC_FLAG_AUX) {
if (sbuf_putc(sb, '[') == -1)
return (EINVAL);
if (lomac_element_to_string(sb, &ml->ml_auxsingle) == -1)
return (EINVAL);
if (sbuf_putc(sb, ']') == -1)
return (EINVAL);
}
if (ml->ml_flags & MAC_LOMAC_FLAG_RANGE) {
if (sbuf_putc(sb, '(') == -1)
return (EINVAL);
if (lomac_element_to_string(sb, &ml->ml_rangelow) == -1)
return (EINVAL);
if (sbuf_putc(sb, '-') == -1)
return (EINVAL);
if (lomac_element_to_string(sb, &ml->ml_rangehigh) == -1)
return (EINVAL);
if (sbuf_putc(sb, ')') == -1)
return (EINVAL);
}
return (0);
}
static int
lomac_externalize_label(struct label *label, char *element_name,
struct sbuf *sb, int *claimed)
{
struct mac_lomac *ml;
if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
ml = SLOT(label);
return (lomac_to_string(sb, ml));
}
static int
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
lomac_parse(struct mac_lomac *ml, 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),
("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(ml, sizeof(*ml));
if (single != NULL) {
error = lomac_parse_element(&ml->ml_single, single);
if (error)
return (error);
ml->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
}
if (auxsingle != NULL) {
error = lomac_parse_element(&ml->ml_auxsingle, auxsingle);
if (error)
return (error);
ml->ml_flags |= MAC_LOMAC_FLAG_AUX;
}
if (rangelow != NULL) {
error = lomac_parse_element(&ml->ml_rangelow, rangelow);
if (error)
return (error);
error = lomac_parse_element(&ml->ml_rangehigh, rangehigh);
if (error)
return (error);
ml->ml_flags |= MAC_LOMAC_FLAG_RANGE;
}
error = lomac_valid(ml);
if (error)
return (error);
return (0);
}
static int
lomac_internalize_label(struct label *label, char *element_name,
char *element_data, int *claimed)
{
struct mac_lomac *ml, ml_temp;
int error;
if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
error = lomac_parse(&ml_temp, element_data);
if (error)
return (error);
ml = SLOT(label);
*ml = ml_temp;
return (0);
}
static void
lomac_copy_label(struct label *src, struct label *dest)
{
*SLOT(dest) = *SLOT(src);
}
/*
* Object-specific entry point implementations are sorted alphabetically by
* object type name and then by operation.
*/
static int
lomac_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
struct ifnet *ifp, struct label *ifplabel)
{
struct mac_lomac *a, *b;
if (!lomac_enabled)
return (0);
a = SLOT(dlabel);
b = SLOT(ifplabel);
if (lomac_equal_single(a, b))
return (0);
return (EACCES);
}
static void
lomac_bpfdesc_create(struct ucred *cred, struct bpf_d *d,
struct label *dlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(dlabel);
lomac_copy_single(source, dest);
}
static void
lomac_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(dlabel);
dest = SLOT(mlabel);
lomac_copy_single(source, dest);
}
static int
lomac_cred_check_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)
lomac_copy_single(subj, new);
if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
lomac_copy_range(subj, new);
/*
* To change the LOMAC range on a credential, the new range
* label must be in the current range.
*/
if (!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 (!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 (lomac_contains_equal(new)) {
error = 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
lomac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cr1->cr_label);
obj = SLOT(cr2->cr_label);
/* XXX: range */
if (!lomac_dominate_single(obj, subj))
return (ESRCH);
return (0);
}
static void
lomac_cred_create_init(struct ucred *cred)
{
struct mac_lomac *dest;
dest = SLOT(cred->cr_label);
lomac_set_single(dest, MAC_LOMAC_TYPE_HIGH, 0);
lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0);
}
static void
lomac_cred_create_swapper(struct ucred *cred)
{
struct mac_lomac *dest;
dest = SLOT(cred->cr_label);
lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH, 0);
}
static void
lomac_cred_relabel(struct ucred *cred, struct label *newlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(newlabel);
dest = SLOT(cred->cr_label);
try_relabel(source, dest);
}
static void
lomac_devfs_create_device(struct ucred *cred, struct mount *mp,
struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
{
struct mac_lomac *ml;
int lomac_type;
ml = SLOT(delabel);
if (strcmp(dev->si_name, "null") == 0 ||
strcmp(dev->si_name, "zero") == 0 ||
strcmp(dev->si_name, "random") == 0 ||
strncmp(dev->si_name, "fd/", strlen("fd/")) == 0 ||
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, "pts/", strlen("pts/")) == 0 ||
strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
lomac_type = MAC_LOMAC_TYPE_EQUAL;
else
lomac_type = MAC_LOMAC_TYPE_HIGH;
lomac_set_single(ml, lomac_type, 0);
}
static void
lomac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
struct devfs_dirent *de, struct label *delabel)
{
struct mac_lomac *ml;
ml = SLOT(delabel);
lomac_set_single(ml, MAC_LOMAC_TYPE_HIGH, 0);
}
static void
lomac_devfs_create_symlink(struct ucred *cred, struct mount *mp,
struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
struct label *delabel)
{
struct mac_lomac *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(delabel);
lomac_copy_single(source, dest);
}
static void
lomac_devfs_update(struct mount *mp, struct devfs_dirent *de,
struct label *delabel, struct vnode *vp, struct label *vplabel)
{
struct mac_lomac *source, *dest;
source = SLOT(vplabel);
dest = SLOT(delabel);
lomac_copy(source, dest);
}
static void
lomac_devfs_vnode_associate(struct mount *mp, struct label *mplabel,
struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
struct label *vplabel)
{
struct mac_lomac *source, *dest;
source = SLOT(delabel);
dest = SLOT(vplabel);
lomac_copy_single(source, dest);
}
static int
lomac_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
struct label *ifplabel, 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 = 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)
lomac_copy_single(subj, new);
if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
lomac_copy_range(subj, new);
/*
* Rely on the traditional superuser status for the LOMAC
* interface relabel requirements. XXXMAC: This will go
* away.
*
* XXXRW: This is also redundant to a higher layer check.
*/
error = priv_check_cred(cred, PRIV_NET_SETIFMAC, 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
lomac_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *p, *i;
if (!lomac_enabled)
return (0);
p = SLOT(mlabel);
i = SLOT(ifplabel);
return (lomac_single_in_range(p, i) ? 0 : EACCES);
}
static void
lomac_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
{
char tifname[IFNAMSIZ], *p, *q;
char tiflist[sizeof(trusted_interfaces)];
struct mac_lomac *dest;
int len, grade;
dest = SLOT(ifplabel);
if (ifp->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;
for (p = q = tiflist;; p++) {
if (*p == ',' || *p == '\0') {
len = p - q;
if (len < IFNAMSIZ) {
bzero(tifname, sizeof(tifname));
bcopy(q, tifname, len);
if (strcmp(tifname, ifp->if_xname) == 0) {
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:
lomac_set_single(dest, grade, 0);
lomac_set_range(dest, grade, 0, grade, 0);
}
static void
lomac_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(ifplabel);
dest = SLOT(mlabel);
lomac_copy_single(source, dest);
}
static void
lomac_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
struct label *ifplabel, struct label *newlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(newlabel);
dest = SLOT(ifplabel);
try_relabel(source, dest);
}
static int
lomac_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *p, *i;
if (!lomac_enabled)
return (0);
p = SLOT(mlabel);
i = SLOT(inplabel);
return (lomac_equal_single(p, i) ? 0 : EACCES);
}
static int
lomac_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
struct label *inplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(inplabel);
if (!lomac_dominate_single(obj, subj))
return (ENOENT);
return (0);
}
static void
lomac_inpcb_create(struct socket *so, struct label *solabel,
struct inpcb *inp, struct label *inplabel)
{
struct mac_lomac *source, *dest;
source = SLOT(solabel);
dest = SLOT(inplabel);
lomac_copy_single(source, dest);
}
static void
lomac_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(inplabel);
dest = SLOT(mlabel);
lomac_copy_single(source, dest);
}
static void
lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel,
struct inpcb *inp, struct label *inplabel)
{
struct mac_lomac *source, *dest;
SOCK_LOCK_ASSERT(so);
source = SLOT(solabel);
dest = SLOT(inplabel);
lomac_copy_single(source, dest);
}
static void
lomac_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
struct label *q6label)
{
struct mac_lomac *source, *dest;
source = SLOT(mlabel);
dest = SLOT(q6label);
lomac_copy_single(source, dest);
}
static int
lomac_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
struct label *q6label)
{
struct mac_lomac *a, *b;
a = SLOT(q6label);
b = SLOT(mlabel);
return (lomac_equal_single(a, b));
}
static void
lomac_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
struct label *mlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(q6label);
dest = SLOT(mlabel);
/* Just use the head, since we require them all to match. */
lomac_copy_single(source, dest);
}
static void
lomac_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
struct label *q6label)
{
/* NOOP: we only accept matching labels, so no need to update */
}
static void
lomac_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
struct label *qlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(mlabel);
dest = SLOT(qlabel);
lomac_copy_single(source, dest);
}
static int
lomac_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
struct label *qlabel)
{
struct mac_lomac *a, *b;
a = SLOT(qlabel);
b = SLOT(mlabel);
return (lomac_equal_single(a, b));
}
static void
lomac_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
struct label *mlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(qlabel);
dest = SLOT(mlabel);
/* Just use the head, since we require them all to match. */
lomac_copy_single(source, dest);
}
static void
lomac_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
struct label *qlabel)
{
/* NOOP: we only accept matching labels, so no need to update */
}
static int
lomac_kld_check_load(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (lomac_subject_privileged(subj))
return (EPERM);
if (!lomac_high_single(obj))
return (EACCES);
return (0);
}
static void
lomac_mount_create(struct ucred *cred, struct mount *mp,
struct label *mplabel)
{
struct mac_lomac *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(mplabel);
lomac_copy_single(source, dest);
}
static void
lomac_netatalk_aarp_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *dest;
dest = SLOT(mlabel);
lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
}
static void
lomac_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *dest;
dest = SLOT(mlabel);
lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
}
static void
lomac_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
struct mbuf *msend, struct label *msendlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(mrecvlabel);
dest = SLOT(msendlabel);
lomac_copy_single(source, dest);
}
static void
lomac_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *dest;
dest = SLOT(mlabel);
/* XXX: where is the label for the firewall really comming from? */
lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
}
static void
lomac_netinet_fragment(struct mbuf *m, struct label *mlabel,
struct mbuf *frag, struct label *fraglabel)
{
struct mac_lomac *source, *dest;
source = SLOT(mlabel);
dest = SLOT(fraglabel);
lomac_copy_single(source, dest);
}
static void
lomac_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
struct mbuf *msend, struct label *msendlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(mrecvlabel);
dest = SLOT(msendlabel);
lomac_copy_single(source, dest);
}
static void
lomac_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *dest;
dest = SLOT(mlabel);
lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
}
static void
lomac_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *dest;
dest = SLOT(mlabel);
lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
}
static int
lomac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
{
if (!lomac_enabled)
return (0);
/* XXX: This will be implemented soon... */
return (0);
}
static int
lomac_pipe_check_read(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!lomac_dominate_single(obj, subj))
return (maybe_demote(subj, obj, "reading", "pipe", NULL));
return (0);
}
static int
lomac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, struct label *newlabel)
{
struct mac_lomac *subj, *obj, *new;
int error;
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
/*
* 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 (!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 (!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 (lomac_contains_equal(new)) {
error = lomac_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
lomac_pipe_check_write(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static void
lomac_pipe_create(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_lomac *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(pplabel);
lomac_copy_single(source, dest);
}
static void
lomac_pipe_relabel(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, struct label *newlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(newlabel);
dest = SLOT(pplabel);
try_relabel(source, dest);
}
/*
* Some system privileges are allowed regardless of integrity grade; others
* are allowed only when running with privilege with respect to the LOMAC
* policy as they might otherwise allow bypassing of the integrity policy.
*/
static int
lomac_priv_check(struct ucred *cred, int priv)
{
struct mac_lomac *subj;
int error;
if (!lomac_enabled)
return (0);
/*
* Exempt only specific privileges from the LOMAC integrity policy.
*/
switch (priv) {
case PRIV_KTRACE:
case PRIV_MSGBUF:
/*
* Allow processes to manipulate basic process audit properties, and
* to submit audit records.
*/
case PRIV_AUDIT_GETAUDIT:
case PRIV_AUDIT_SETAUDIT:
case PRIV_AUDIT_SUBMIT:
/*
* Allow processes to manipulate their regular UNIX credentials.
*/
case PRIV_CRED_SETUID:
case PRIV_CRED_SETEUID:
case PRIV_CRED_SETGID:
case PRIV_CRED_SETEGID:
case PRIV_CRED_SETGROUPS:
case PRIV_CRED_SETREUID:
case PRIV_CRED_SETREGID:
case PRIV_CRED_SETRESUID:
case PRIV_CRED_SETRESGID:
/*
* Allow processes to perform system monitoring.
*/
case PRIV_SEEOTHERGIDS:
case PRIV_SEEOTHERUIDS:
break;
/*
* Allow access to general process debugging facilities. We
* separately control debugging based on MAC label.
*/
case PRIV_DEBUG_DIFFCRED:
case PRIV_DEBUG_SUGID:
case PRIV_DEBUG_UNPRIV:
/*
* Allow manipulating jails.
*/
case PRIV_JAIL_ATTACH:
/*
* Allow privilege with respect to the Partition policy, but not the
* Privs policy.
*/
case PRIV_MAC_PARTITION:
/*
* Allow privilege with respect to process resource limits and login
* context.
*/
case PRIV_PROC_LIMIT:
case PRIV_PROC_SETLOGIN:
case PRIV_PROC_SETRLIMIT:
/*
* Allow System V and POSIX IPC privileges.
*/
case PRIV_IPC_READ:
case PRIV_IPC_WRITE:
case PRIV_IPC_ADMIN:
case PRIV_IPC_MSGSIZE:
case PRIV_MQ_ADMIN:
/*
* Allow certain scheduler manipulations -- possibly this should be
* controlled by more fine-grained policy, as potentially low
* integrity processes can deny CPU to higher integrity ones.
*/
case PRIV_SCHED_DIFFCRED:
case PRIV_SCHED_SETPRIORITY:
case PRIV_SCHED_RTPRIO:
case PRIV_SCHED_SETPOLICY:
case PRIV_SCHED_SET:
case PRIV_SCHED_SETPARAM:
/*
* More IPC privileges.
*/
case PRIV_SEM_WRITE:
/*
* Allow signaling privileges subject to integrity policy.
*/
case PRIV_SIGNAL_DIFFCRED:
case PRIV_SIGNAL_SUGID:
/*
* Allow access to only limited sysctls from lower integrity levels;
* piggy-back on the Jail definition.
*/
case PRIV_SYSCTL_WRITEJAIL:
/*
* Allow TTY-based privileges, subject to general device access using
* labels on TTY device nodes, but not console privilege.
*/
case PRIV_TTY_DRAINWAIT:
case PRIV_TTY_DTRWAIT:
case PRIV_TTY_EXCLUSIVE:
case PRIV_TTY_STI:
case PRIV_TTY_SETA:
/*
* Grant most VFS privileges, as almost all are in practice bounded
* by more specific checks using labels.
*/
case PRIV_VFS_READ:
case PRIV_VFS_WRITE:
case PRIV_VFS_ADMIN:
case PRIV_VFS_EXEC:
case PRIV_VFS_LOOKUP:
case PRIV_VFS_CHFLAGS_DEV:
case PRIV_VFS_CHOWN:
case PRIV_VFS_CHROOT:
case PRIV_VFS_RETAINSUGID:
case PRIV_VFS_EXCEEDQUOTA:
case PRIV_VFS_FCHROOT:
case PRIV_VFS_FHOPEN:
case PRIV_VFS_FHSTATFS:
case PRIV_VFS_GENERATION:
case PRIV_VFS_GETFH:
case PRIV_VFS_GETQUOTA:
case PRIV_VFS_LINK:
case PRIV_VFS_MOUNT:
case PRIV_VFS_MOUNT_OWNER:
case PRIV_VFS_MOUNT_PERM:
case PRIV_VFS_MOUNT_SUIDDIR:
case PRIV_VFS_MOUNT_NONUSER:
case PRIV_VFS_SETGID:
case PRIV_VFS_STICKYFILE:
case PRIV_VFS_SYSFLAGS:
case PRIV_VFS_UNMOUNT:
/*
* Allow VM privileges; it would be nice if these were subject to
* resource limits.
*/
case PRIV_VM_MADV_PROTECT:
case PRIV_VM_MLOCK:
case PRIV_VM_MUNLOCK:
case PRIV_VM_SWAP_NOQUOTA:
case PRIV_VM_SWAP_NORLIMIT:
/*
* Allow some but not all network privileges. In general, dont allow
* reconfiguring the network stack, just normal use.
*/
case PRIV_NETATALK_RESERVEDPORT:
case PRIV_NETINET_RESERVEDPORT:
case PRIV_NETINET_RAW:
case PRIV_NETINET_REUSEPORT:
case PRIV_NETIPX_RESERVEDPORT:
case PRIV_NETIPX_RAW:
break;
/*
* All remaining system privileges are allow only if the process
* holds privilege with respect to the LOMAC policy.
*/
default:
subj = SLOT(cred->cr_label);
error = lomac_subject_privileged(subj);
if (error)
return (error);
}
return (0);
}
static int
lomac_proc_check_debug(struct ucred *cred, struct proc *p)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!lomac_dominate_single(obj, subj))
return (ESRCH);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_proc_check_sched(struct ucred *cred, struct proc *p)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!lomac_dominate_single(obj, subj))
return (ESRCH);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!lomac_dominate_single(obj, subj))
return (ESRCH);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static void
lomac_proc_destroy_label(struct label *label)
{
mtx_destroy(&PSLOT(label)->mtx);
free(PSLOT(label), M_LOMAC);
PSLOT_SET(label, NULL);
}
static void
lomac_proc_init_label(struct label *label)
{
PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_LOMAC,
M_ZERO | M_WAITOK));
mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF);
}
static int
lomac_socket_check_deliver(struct socket *so, struct label *solabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *p, *s;
int error;
if (!lomac_enabled)
return (0);
p = SLOT(mlabel);
s = SLOT(solabel);
SOCK_LOCK(so);
error = lomac_equal_single(p, s) ? 0 : EACCES;
SOCK_UNLOCK(so);
return (error);
}
static int
lomac_socket_check_relabel(struct ucred *cred, struct socket *so,
struct label *solabel, struct label *newlabel)
{
struct mac_lomac *subj, *obj, *new;
int error;
SOCK_LOCK_ASSERT(so);
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
obj = SLOT(solabel);
/*
* 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 (!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 (!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 (lomac_contains_equal(new)) {
error = lomac_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
lomac_socket_check_visible(struct ucred *cred, struct socket *so,
struct label *solabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(solabel);
SOCK_LOCK(so);
if (!lomac_dominate_single(obj, subj)) {
SOCK_UNLOCK(so);
return (ENOENT);
}
SOCK_UNLOCK(so);
return (0);
}
static void
lomac_socket_create(struct ucred *cred, struct socket *so,
struct label *solabel)
{
struct mac_lomac *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(solabel);
lomac_copy_single(source, dest);
}
static void
lomac_socket_create_mbuf(struct socket *so, struct label *solabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(solabel);
dest = SLOT(mlabel);
SOCK_LOCK(so);
lomac_copy_single(source, dest);
SOCK_UNLOCK(so);
}
static void
lomac_socket_newconn(struct socket *oldso, struct label *oldsolabel,
struct socket *newso, struct label *newsolabel)
{
struct mac_lomac source, *dest;
SOCK_LOCK(oldso);
source = *SLOT(oldsolabel);
SOCK_UNLOCK(oldso);
dest = SLOT(newsolabel);
SOCK_LOCK(newso);
lomac_copy_single(&source, dest);
SOCK_UNLOCK(newso);
}
static void
lomac_socket_relabel(struct ucred *cred, struct socket *so,
struct label *solabel, struct label *newlabel)
{
struct mac_lomac *source, *dest;
SOCK_LOCK_ASSERT(so);
source = SLOT(newlabel);
dest = SLOT(solabel);
try_relabel(source, dest);
}
static void
lomac_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
struct socket *so, struct label *sopeerlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(mlabel);
dest = SLOT(sopeerlabel);
SOCK_LOCK(so);
lomac_copy_single(source, dest);
SOCK_UNLOCK(so);
}
static void
lomac_socketpeer_set_from_socket(struct socket *oldso,
struct label *oldsolabel, struct socket *newso,
struct label *newsopeerlabel)
{
struct mac_lomac source, *dest;
SOCK_LOCK(oldso);
source = *SLOT(oldsolabel);
SOCK_UNLOCK(oldso);
dest = SLOT(newsopeerlabel);
SOCK_LOCK(newso);
lomac_copy_single(&source, dest);
SOCK_UNLOCK(newso);
}
static void
lomac_syncache_create(struct label *label, struct inpcb *inp)
{
struct mac_lomac *source, *dest;
source = SLOT(inp->inp_label);
dest = SLOT(label);
lomac_copy(source, dest);
}
static void
lomac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
struct label *mlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(sc_label);
dest = SLOT(mlabel);
lomac_copy(source, dest);
}
static int
lomac_system_check_acct(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (lomac_subject_privileged(subj))
return (EPERM);
if (!lomac_high_single(obj))
return (EACCES);
return (0);
}
static int
lomac_system_check_auditctl(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (lomac_subject_privileged(subj))
return (EPERM);
if (!lomac_high_single(obj))
return (EACCES);
return (0);
}
static int
lomac_system_check_swapoff(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_lomac *subj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
if (lomac_subject_privileged(subj))
return (EPERM);
return (0);
}
static int
lomac_system_check_swapon(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (lomac_subject_privileged(subj))
return (EPERM);
if (!lomac_high_single(obj))
return (EACCES);
return (0);
}
static int
lomac_system_check_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
void *arg1, int arg2, struct sysctl_req *req)
{
struct mac_lomac *subj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
/*
* Treat sysctl variables without CTLFLAG_ANYBODY flag as lomac/high,
* but also require privilege to change them.
*/
if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
#ifdef notdef
if (!lomac_subject_dominate_high(subj))
return (EACCES);
#endif
if (lomac_subject_privileged(subj))
return (EPERM);
}
return (0);
}
static void
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_proc_vm_revoke;
* 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);
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_proc_vm_revoke(curthread);
mtx_unlock(&Giant);
} else {
mtx_unlock(&subj->mtx);
}
}
static int
lomac_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
struct vnode *vp, struct label *vplabel)
{
struct mac_lomac ml_temp, *source, *dest;
int buflen, error;
source = SLOT(mplabel);
dest = SLOT(vplabel);
buflen = sizeof(ml_temp);
bzero(&ml_temp, buflen);
error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&ml_temp, curthread);
if (error == ENOATTR || error == EOPNOTSUPP) {
/* Fall back to the mntlabel. */
lomac_copy_single(source, dest);
return (0);
} else if (error)
return (error);
if (buflen != sizeof(ml_temp)) {
if (buflen != sizeof(ml_temp) - sizeof(ml_temp.ml_auxsingle)) {
printf("lomac_vnode_associate_extattr: bad size %d\n",
buflen);
return (EPERM);
}
bzero(&ml_temp.ml_auxsingle, sizeof(ml_temp.ml_auxsingle));
buflen = sizeof(ml_temp);
(void)vn_extattr_set(vp, IO_NODELOCKED,
MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME,
buflen, (char *)&ml_temp, curthread);
}
if (lomac_valid(&ml_temp) != 0) {
printf("lomac_vnode_associate_extattr: invalid\n");
return (EPERM);
}
if ((ml_temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) !=
MAC_LOMAC_FLAG_SINGLE) {
printf("lomac_vnode_associate_extattr: not single\n");
return (EPERM);
}
lomac_copy_single(&ml_temp, dest);
return (0);
}
static void
lomac_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
struct vnode *vp, struct label *vplabel)
{
struct mac_lomac *source, *dest;
source = SLOT(mplabel);
dest = SLOT(vplabel);
lomac_copy_single(source, dest);
}
static int
lomac_vnode_check_create(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
if (obj->ml_flags & MAC_LOMAC_FLAG_AUX &&
!lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_link(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int prot, int flags)
{
struct mac_lomac *subj, *obj;
/*
* Rely on the use of open()-time protections to handle
* non-revocation cases.
*/
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
}
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
if (!lomac_dominate_single(obj, subj))
return (maybe_demote(subj, obj, "mapping", "file", vp));
}
return (0);
}
static void
lomac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
struct label *vplabel, /* 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 (!lomac_enabled || !revocation_enabled)
return;
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
*prot &= ~VM_PROT_WRITE;
}
static int
lomac_vnode_check_open(struct ucred *cred, struct vnode *vp,
struct label *vplabel, accmode_t accmode)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
/* XXX privilege override for admin? */
if (accmode & VMODIFY_PERMS) {
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
}
return (0);
}
static int
lomac_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_dominate_single(obj, subj))
return (maybe_demote(subj, obj, "reading", "file", vp));
return (0);
}
static int
lomac_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *newlabel)
{
struct mac_lomac *old, *new, *subj;
int error;
old = SLOT(vplabel);
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 (!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 (!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 (lomac_contains_equal(new)) {
error = 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)
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 (!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 (lomac_contains_equal(new)) {
error = lomac_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
lomac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
int samedir, struct componentname *cnp)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
if (vp != NULL) {
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
}
return (0);
}
static int
lomac_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type, struct acl *acl)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
/* XXX: protect the MAC EA in a special way? */
return (0);
}
static int
lomac_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
struct label *vplabel, u_long flags)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
struct label *vplabel, mode_t mode)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
struct label *vplabel, uid_t uid, gid_t gid)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct timespec atime, struct timespec mtime)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_check_write(struct ucred *active_cred,
struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
{
struct mac_lomac *subj, *obj;
if (!lomac_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!lomac_subject_dominate(subj, obj))
return (EACCES);
return (0);
}
static int
lomac_vnode_create_extattr(struct ucred *cred, struct mount *mp,
struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
struct vnode *vp, struct label *vplabel, struct componentname *cnp)
{
struct mac_lomac *source, *dest, *dir, temp;
size_t buflen;
int error;
buflen = sizeof(temp);
bzero(&temp, buflen);
source = SLOT(cred->cr_label);
dest = SLOT(vplabel);
dir = SLOT(dvplabel);
if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) {
lomac_copy_auxsingle(dir, &temp);
lomac_set_single(&temp, dir->ml_auxsingle.mle_type,
dir->ml_auxsingle.mle_grade);
} else {
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)
lomac_copy(&temp, dest);
return (error);
}
static void
lomac_vnode_execve_transition(struct ucred *old, struct ucred *new,
struct vnode *vp, struct label *vplabel, struct label *interpvplabel,
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(vplabel);
robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
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 &&
!lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single)
&& lomac_auxsingle_in_range(robj, dest))
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 (lomac_enabled && revocation_enabled &&
!lomac_dominate_single(obj, source))
(void)maybe_demote(source, obj, "executing", "file", vp);
}
static int
lomac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp,
struct label *vplabel, struct label *interpvplabel,
struct image_params *imgp, struct label *execlabel)
{
struct mac_lomac *subj, *obj, *robj;
if (!lomac_enabled || !revocation_enabled)
return (0);
subj = SLOT(old->cr_label);
obj = SLOT(vplabel);
robj = interpvplabel != NULL ? SLOT(interpvplabel) : obj;
return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
!lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single)
&& lomac_auxsingle_in_range(robj, subj)) ||
!lomac_dominate_single(obj, subj));
}
static void
lomac_vnode_relabel(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *newlabel)
{
struct mac_lomac *source, *dest;
source = SLOT(newlabel);
dest = SLOT(vplabel);
try_relabel(source, dest);
}
static int
lomac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, 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);
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);
}
static struct mac_policy_ops lomac_ops =
{
.mpo_init = lomac_init,
.mpo_bpfdesc_check_receive = lomac_bpfdesc_check_receive,
.mpo_bpfdesc_create = lomac_bpfdesc_create,
.mpo_bpfdesc_create_mbuf = lomac_bpfdesc_create_mbuf,
.mpo_bpfdesc_destroy_label = lomac_destroy_label,
.mpo_bpfdesc_init_label = lomac_init_label,
.mpo_cred_check_relabel = lomac_cred_check_relabel,
.mpo_cred_check_visible = lomac_cred_check_visible,
.mpo_cred_copy_label = lomac_copy_label,
.mpo_cred_create_swapper = lomac_cred_create_swapper,
.mpo_cred_create_init = lomac_cred_create_init,
.mpo_cred_destroy_label = lomac_destroy_label,
.mpo_cred_externalize_label = lomac_externalize_label,
.mpo_cred_init_label = lomac_init_label,
.mpo_cred_internalize_label = lomac_internalize_label,
.mpo_cred_relabel = lomac_cred_relabel,
.mpo_devfs_create_device = lomac_devfs_create_device,
.mpo_devfs_create_directory = lomac_devfs_create_directory,
.mpo_devfs_create_symlink = lomac_devfs_create_symlink,
.mpo_devfs_destroy_label = lomac_destroy_label,
.mpo_devfs_init_label = lomac_init_label,
.mpo_devfs_update = lomac_devfs_update,
.mpo_devfs_vnode_associate = lomac_devfs_vnode_associate,
.mpo_ifnet_check_relabel = lomac_ifnet_check_relabel,
.mpo_ifnet_check_transmit = lomac_ifnet_check_transmit,
.mpo_ifnet_copy_label = lomac_copy_label,
.mpo_ifnet_create = lomac_ifnet_create,
.mpo_ifnet_create_mbuf = lomac_ifnet_create_mbuf,
.mpo_ifnet_destroy_label = lomac_destroy_label,
.mpo_ifnet_externalize_label = lomac_externalize_label,
.mpo_ifnet_init_label = lomac_init_label,
.mpo_ifnet_internalize_label = lomac_internalize_label,
.mpo_ifnet_relabel = lomac_ifnet_relabel,
.mpo_syncache_create = lomac_syncache_create,
.mpo_syncache_destroy_label = lomac_destroy_label,
.mpo_syncache_init_label = lomac_init_label_waitcheck,
.mpo_inpcb_check_deliver = lomac_inpcb_check_deliver,
.mpo_inpcb_check_visible = lomac_inpcb_check_visible,
.mpo_inpcb_create = lomac_inpcb_create,
.mpo_inpcb_create_mbuf = lomac_inpcb_create_mbuf,
.mpo_inpcb_destroy_label = lomac_destroy_label,
.mpo_inpcb_init_label = lomac_init_label_waitcheck,
.mpo_inpcb_sosetlabel = lomac_inpcb_sosetlabel,
.mpo_ip6q_create = lomac_ip6q_create,
.mpo_ip6q_destroy_label = lomac_destroy_label,
.mpo_ip6q_init_label = lomac_init_label_waitcheck,
.mpo_ip6q_match = lomac_ip6q_match,
.mpo_ip6q_reassemble = lomac_ip6q_reassemble,
.mpo_ip6q_update = lomac_ip6q_update,
.mpo_ipq_create = lomac_ipq_create,
.mpo_ipq_destroy_label = lomac_destroy_label,
.mpo_ipq_init_label = lomac_init_label_waitcheck,
.mpo_ipq_match = lomac_ipq_match,
.mpo_ipq_reassemble = lomac_ipq_reassemble,
.mpo_ipq_update = lomac_ipq_update,
.mpo_kld_check_load = lomac_kld_check_load,
.mpo_mbuf_copy_label = lomac_copy_label,
.mpo_mbuf_destroy_label = lomac_destroy_label,
.mpo_mbuf_init_label = lomac_init_label_waitcheck,
.mpo_mount_create = lomac_mount_create,
.mpo_mount_destroy_label = lomac_destroy_label,
.mpo_mount_init_label = lomac_init_label,
.mpo_netatalk_aarp_send = lomac_netatalk_aarp_send,
.mpo_netinet_arp_send = lomac_netinet_arp_send,
.mpo_netinet_firewall_reply = lomac_netinet_firewall_reply,
.mpo_netinet_firewall_send = lomac_netinet_firewall_send,
.mpo_netinet_fragment = lomac_netinet_fragment,
.mpo_netinet_icmp_reply = lomac_netinet_icmp_reply,
.mpo_netinet_igmp_send = lomac_netinet_igmp_send,
.mpo_netinet6_nd6_send = lomac_netinet6_nd6_send,
.mpo_pipe_check_ioctl = lomac_pipe_check_ioctl,
.mpo_pipe_check_read = lomac_pipe_check_read,
.mpo_pipe_check_relabel = lomac_pipe_check_relabel,
.mpo_pipe_check_write = lomac_pipe_check_write,
.mpo_pipe_copy_label = lomac_copy_label,
.mpo_pipe_create = lomac_pipe_create,
.mpo_pipe_destroy_label = lomac_destroy_label,
.mpo_pipe_externalize_label = lomac_externalize_label,
.mpo_pipe_init_label = lomac_init_label,
.mpo_pipe_internalize_label = lomac_internalize_label,
.mpo_pipe_relabel = lomac_pipe_relabel,
.mpo_priv_check = lomac_priv_check,
.mpo_proc_check_debug = lomac_proc_check_debug,
.mpo_proc_check_sched = lomac_proc_check_sched,
.mpo_proc_check_signal = lomac_proc_check_signal,
.mpo_proc_destroy_label = lomac_proc_destroy_label,
.mpo_proc_init_label = lomac_proc_init_label,
.mpo_socket_check_deliver = lomac_socket_check_deliver,
.mpo_socket_check_relabel = lomac_socket_check_relabel,
.mpo_socket_check_visible = lomac_socket_check_visible,
.mpo_socket_copy_label = lomac_copy_label,
.mpo_socket_create = lomac_socket_create,
.mpo_socket_create_mbuf = lomac_socket_create_mbuf,
.mpo_socket_destroy_label = lomac_destroy_label,
.mpo_socket_externalize_label = lomac_externalize_label,
.mpo_socket_init_label = lomac_init_label_waitcheck,
.mpo_socket_internalize_label = lomac_internalize_label,
.mpo_socket_newconn = lomac_socket_newconn,
.mpo_socket_relabel = lomac_socket_relabel,
.mpo_socketpeer_destroy_label = lomac_destroy_label,
.mpo_socketpeer_externalize_label = lomac_externalize_label,
.mpo_socketpeer_init_label = lomac_init_label_waitcheck,
.mpo_socketpeer_set_from_mbuf = lomac_socketpeer_set_from_mbuf,
.mpo_socketpeer_set_from_socket = lomac_socketpeer_set_from_socket,
.mpo_syncache_create_mbuf = lomac_syncache_create_mbuf,
.mpo_system_check_acct = lomac_system_check_acct,
.mpo_system_check_auditctl = lomac_system_check_auditctl,
.mpo_system_check_swapoff = lomac_system_check_swapoff,
.mpo_system_check_swapon = lomac_system_check_swapon,
.mpo_system_check_sysctl = lomac_system_check_sysctl,
.mpo_thread_userret = lomac_thread_userret,
.mpo_vnode_associate_extattr = lomac_vnode_associate_extattr,
.mpo_vnode_associate_singlelabel = lomac_vnode_associate_singlelabel,
.mpo_vnode_check_access = lomac_vnode_check_open,
.mpo_vnode_check_create = lomac_vnode_check_create,
.mpo_vnode_check_deleteacl = lomac_vnode_check_deleteacl,
.mpo_vnode_check_link = lomac_vnode_check_link,
.mpo_vnode_check_mmap = lomac_vnode_check_mmap,
.mpo_vnode_check_mmap_downgrade = lomac_vnode_check_mmap_downgrade,
.mpo_vnode_check_open = lomac_vnode_check_open,
.mpo_vnode_check_read = lomac_vnode_check_read,
.mpo_vnode_check_relabel = lomac_vnode_check_relabel,
.mpo_vnode_check_rename_from = lomac_vnode_check_rename_from,
.mpo_vnode_check_rename_to = lomac_vnode_check_rename_to,
.mpo_vnode_check_revoke = lomac_vnode_check_revoke,
.mpo_vnode_check_setacl = lomac_vnode_check_setacl,
.mpo_vnode_check_setextattr = lomac_vnode_check_setextattr,
.mpo_vnode_check_setflags = lomac_vnode_check_setflags,
.mpo_vnode_check_setmode = lomac_vnode_check_setmode,
.mpo_vnode_check_setowner = lomac_vnode_check_setowner,
.mpo_vnode_check_setutimes = lomac_vnode_check_setutimes,
.mpo_vnode_check_unlink = lomac_vnode_check_unlink,
.mpo_vnode_check_write = lomac_vnode_check_write,
.mpo_vnode_copy_label = lomac_copy_label,
.mpo_vnode_create_extattr = lomac_vnode_create_extattr,
.mpo_vnode_destroy_label = lomac_destroy_label,
.mpo_vnode_execve_transition = lomac_vnode_execve_transition,
.mpo_vnode_execve_will_transition = lomac_vnode_execve_will_transition,
.mpo_vnode_externalize_label = lomac_externalize_label,
.mpo_vnode_init_label = lomac_init_label,
.mpo_vnode_internalize_label = lomac_internalize_label,
.mpo_vnode_relabel = lomac_vnode_relabel,
.mpo_vnode_setlabel_extattr = lomac_vnode_setlabel_extattr,
};
MAC_POLICY_SET(&lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC",
MPC_LOADTIME_FLAG_NOTLATE, &lomac_slot);
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