0c56cf839d
The SYSCTL_NODE macro defines a list that stores all child-elements of that node. If there's no SYSCTL_DECL macro anywhere else, there's no reason why it shouldn't be static.
190 lines
5.7 KiB
C
190 lines
5.7 KiB
C
/*-
|
|
* Copyright (c) 1999-2002, 2007 Robert N. M. Watson
|
|
* Copyright (c) 2001-2002 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 Network
|
|
* Associates Laboratories, 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.
|
|
*
|
|
* Prevent processes owned by a particular uid from seeing various transient
|
|
* kernel objects associated with other uids.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/route.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_pcb.h>
|
|
|
|
#include <security/mac/mac_policy.h>
|
|
|
|
SYSCTL_DECL(_security_mac);
|
|
|
|
static SYSCTL_NODE(_security_mac, OID_AUTO, seeotheruids, CTLFLAG_RW, 0,
|
|
"TrustedBSD mac_seeotheruids policy controls");
|
|
|
|
static int seeotheruids_enabled = 1;
|
|
SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, enabled, CTLFLAG_RW,
|
|
&seeotheruids_enabled, 0, "Enforce seeotheruids policy");
|
|
|
|
/*
|
|
* Exception: allow credentials to be aware of other credentials with the
|
|
* same primary gid.
|
|
*/
|
|
static int primarygroup_enabled = 0;
|
|
SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, primarygroup_enabled,
|
|
CTLFLAG_RW, &primarygroup_enabled, 0, "Make an exception for credentials "
|
|
"with the same real primary group id");
|
|
|
|
/*
|
|
* Exception: allow the root user to be aware of other credentials by virtue
|
|
* of privilege.
|
|
*/
|
|
static int suser_privileged = 1;
|
|
SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, suser_privileged,
|
|
CTLFLAG_RW, &suser_privileged, 0, "Make an exception for superuser");
|
|
|
|
/*
|
|
* Exception: allow processes with a specific gid to be exempt from the
|
|
* policy. One sysctl enables this functionality; the other sets the
|
|
* exempt gid.
|
|
*/
|
|
static int specificgid_enabled = 0;
|
|
SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, specificgid_enabled,
|
|
CTLFLAG_RW, &specificgid_enabled, 0, "Make an exception for credentials "
|
|
"with a specific gid as their real primary group id or group set");
|
|
|
|
static gid_t specificgid = 0;
|
|
SYSCTL_UINT(_security_mac_seeotheruids, OID_AUTO, specificgid, CTLFLAG_RW,
|
|
&specificgid, 0, "Specific gid to be exempt from seeotheruids policy");
|
|
|
|
static int
|
|
seeotheruids_check(struct ucred *cr1, struct ucred *cr2)
|
|
{
|
|
|
|
if (!seeotheruids_enabled)
|
|
return (0);
|
|
|
|
if (primarygroup_enabled) {
|
|
if (cr1->cr_rgid == cr2->cr_rgid)
|
|
return (0);
|
|
}
|
|
|
|
if (specificgid_enabled) {
|
|
if (cr1->cr_rgid == specificgid ||
|
|
groupmember(specificgid, cr1))
|
|
return (0);
|
|
}
|
|
|
|
if (cr1->cr_ruid == cr2->cr_ruid)
|
|
return (0);
|
|
|
|
if (suser_privileged) {
|
|
if (priv_check_cred(cr1, PRIV_SEEOTHERUIDS, 0) == 0)
|
|
return (0);
|
|
}
|
|
|
|
return (ESRCH);
|
|
}
|
|
|
|
static int
|
|
seeotheruids_proc_check_debug(struct ucred *cred, struct proc *p)
|
|
{
|
|
|
|
return (seeotheruids_check(cred, p->p_ucred));
|
|
}
|
|
|
|
static int
|
|
seeotheruids_proc_check_sched(struct ucred *cred, struct proc *p)
|
|
{
|
|
|
|
return (seeotheruids_check(cred, p->p_ucred));
|
|
}
|
|
|
|
static int
|
|
seeotheruids_proc_check_signal(struct ucred *cred, struct proc *p,
|
|
int signum)
|
|
{
|
|
|
|
return (seeotheruids_check(cred, p->p_ucred));
|
|
}
|
|
|
|
static int
|
|
seeotheruids_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
|
|
{
|
|
|
|
return (seeotheruids_check(cr1, cr2));
|
|
}
|
|
|
|
static int
|
|
seeotheruids_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
|
|
struct label *inplabel)
|
|
{
|
|
|
|
return (seeotheruids_check(cred, inp->inp_cred));
|
|
}
|
|
|
|
static int
|
|
seeotheruids_socket_check_visible(struct ucred *cred, struct socket *so,
|
|
struct label *solabel)
|
|
{
|
|
|
|
return (seeotheruids_check(cred, so->so_cred));
|
|
}
|
|
|
|
static struct mac_policy_ops seeotheruids_ops =
|
|
{
|
|
.mpo_proc_check_debug = seeotheruids_proc_check_debug,
|
|
.mpo_proc_check_sched = seeotheruids_proc_check_sched,
|
|
.mpo_proc_check_signal = seeotheruids_proc_check_signal,
|
|
.mpo_cred_check_visible = seeotheruids_cred_check_visible,
|
|
.mpo_inpcb_check_visible = seeotheruids_inpcb_check_visible,
|
|
.mpo_socket_check_visible = seeotheruids_socket_check_visible,
|
|
};
|
|
|
|
MAC_POLICY_SET(&seeotheruids_ops, mac_seeotheruids,
|
|
"TrustedBSD MAC/seeotheruids", MPC_LOADTIME_FLAG_UNLOADOK, NULL);
|