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freebsd/sys/security/mac_lomac/mac_lomac.c
Mateusz Guzik daf63fd2f9 cred: add proc_set_cred helper 
The goal here is to provide one place altering process credentials.

This eases debugging and opens up posibilities to do additional work when such
an action is performed.
2015-03-16 00:10:03 +00:00

3066 lines
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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);
static 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_RWTUN,
&lomac_enabled, 0, "Enforce MAC/LOMAC policy");
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_RDTUN,
&trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC");
static char trusted_interfaces[128];
SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RDTUN,
trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC");
static int ptys_equal = 0;
SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RWTUN,
&ptys_equal, 0, "Label pty devices as lomac/equal on create");
static int revocation_enabled = 1;
SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RWTUN,
&revocation_enabled, 0, "Revoke access to objects on relabel");
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))
static 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=%ju, "
"mountpount=%s)\n",
subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
p->p_comm, subjtext, actionname, objlabeltext, objname,
(uintmax_t)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 = strchr(string, '(');
if (range == single)
single = NULL;
auxsingle = strchr(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 = strchr(rangelow, '-');
if (rangehigh == NULL)
return (EINVAL);
rangehigh++;
if (*rangelow == '\0' || *rangehigh == '\0')
return (EINVAL);
rangeend = strchr(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 = strchr(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;
const char *dn;
int lomac_type;
ml = SLOT(delabel);
dn = devtoname(dev);
if (strcmp(dn, "null") == 0 ||
strcmp(dn, "zero") == 0 ||
strcmp(dn, "random") == 0 ||
strncmp(dn, "fd/", strlen("fd/")) == 0 ||
strncmp(dn, "ttyv", strlen("ttyv")) == 0)
lomac_type = MAC_LOMAC_TYPE_EQUAL;
else if (ptys_equal &&
(strncmp(dn, "ttyp", strlen("ttyp")) == 0 ||
strncmp(dn, "pts/", strlen("pts/")) == 0 ||
strncmp(dn, "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_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_NETINET_RESERVEDPORT:
case PRIV_NETINET_RAW:
case PRIV_NETINET_REUSEPORT:
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));
proc_set_cred(p, 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_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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