30d239bc4c
from Mac OS X Leopard--rationalize naming for entry points to
the following general forms:
mac_<object>_<method/action>
mac_<object>_check_<method/action>
The previous naming scheme was inconsistent and mostly
reversed from the new scheme. Also, make object types more
consistent and remove spaces from object types that contain
multiple parts ("posix_sem" -> "posixsem") to make mechanical
parsing easier. Introduce a new "netinet" object type for
certain IPv4/IPv6-related methods. Also simplify, slightly,
some entry point names.
All MAC policy modules will need to be recompiled, and modules
not updates as part of this commit will need to be modified to
conform to the new KPI.
Sponsored by: SPARTA (original patches against Mac OS X)
Obtained from: TrustedBSD Project, Apple Computer
176 lines
5.5 KiB
C
176 lines
5.5 KiB
C
/*-
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* Copyright (c) 1999-2002, 2007 Robert N. M. Watson
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* Copyright (c) 2001-2002 Networks Associates Technology, Inc.
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* Copyright (c) 2006 SPARTA, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert Watson for the TrustedBSD Project.
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*
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* This software was developed for the FreeBSD Project in part by Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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* as part of the DARPA CHATS research program.
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*
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* This software was enhanced by SPARTA ISSO under SPAWAR contract
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* N66001-04-C-6019 ("SEFOS").
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Developed by the TrustedBSD Project.
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*
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* Prevent processes owned by a particular uid from seeing various transient
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* kernel objects associated with other uids.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <security/mac/mac_policy.h>
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SYSCTL_DECL(_security_mac);
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SYSCTL_NODE(_security_mac, OID_AUTO, seeotheruids, CTLFLAG_RW, 0,
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"TrustedBSD mac_seeotheruids policy controls");
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static int mac_seeotheruids_enabled = 1;
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SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, enabled, CTLFLAG_RW,
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&mac_seeotheruids_enabled, 0, "Enforce seeotheruids policy");
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/*
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* Exception: allow credentials to be aware of other credentials with the
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* same primary gid.
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*/
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static int primarygroup_enabled = 0;
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SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, primarygroup_enabled,
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CTLFLAG_RW, &primarygroup_enabled, 0, "Make an exception for credentials "
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"with the same real primary group id");
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/*
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* Exception: allow the root user to be aware of other credentials by virtue
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* of privilege.
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*/
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static int suser_privileged = 1;
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SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, suser_privileged,
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CTLFLAG_RW, &suser_privileged, 0, "Make an exception for superuser");
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/*
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* Exception: allow processes with a specific gid to be exempt from the
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* policy. One sysctl enables this functionality; the other sets the
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* exempt gid.
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*/
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static int specificgid_enabled = 0;
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SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, specificgid_enabled,
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CTLFLAG_RW, &specificgid_enabled, 0, "Make an exception for credentials "
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"with a specific gid as their real primary group id or group set");
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static gid_t specificgid = 0;
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SYSCTL_INT(_security_mac_seeotheruids, OID_AUTO, specificgid, CTLFLAG_RW,
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&specificgid, 0, "Specific gid to be exempt from seeotheruids policy");
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static int
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mac_seeotheruids_check(struct ucred *cr1, struct ucred *cr2)
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{
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if (!mac_seeotheruids_enabled)
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return (0);
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if (primarygroup_enabled) {
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if (cr1->cr_rgid == cr2->cr_rgid)
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return (0);
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}
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if (specificgid_enabled) {
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if (cr1->cr_rgid == specificgid ||
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groupmember(specificgid, cr1))
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return (0);
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}
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if (cr1->cr_ruid == cr2->cr_ruid)
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return (0);
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if (suser_privileged) {
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if (priv_check_cred(cr1, PRIV_SEEOTHERUIDS, 0) == 0)
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return (0);
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}
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return (ESRCH);
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}
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static int
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mac_seeotheruids_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
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{
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return (mac_seeotheruids_check(cr1, cr2));
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}
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static int
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mac_seeotheruids_proc_check_signal(struct ucred *cred, struct proc *p,
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int signum)
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{
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return (mac_seeotheruids_check(cred, p->p_ucred));
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}
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static int
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mac_seeotheruids_proc_check_sched(struct ucred *cred, struct proc *p)
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{
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return (mac_seeotheruids_check(cred, p->p_ucred));
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}
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static int
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mac_seeotheruids_proc_check_debug(struct ucred *cred, struct proc *p)
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{
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return (mac_seeotheruids_check(cred, p->p_ucred));
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}
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static int
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mac_seeotheruids_socket_check_visible(struct ucred *cred, struct socket *so,
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struct label *solabel)
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{
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return (mac_seeotheruids_check(cred, so->so_cred));
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}
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static struct mac_policy_ops mac_seeotheruids_ops =
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{
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.mpo_cred_check_visible = mac_seeotheruids_cred_check_visible,
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.mpo_proc_check_debug = mac_seeotheruids_proc_check_debug,
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.mpo_proc_check_sched = mac_seeotheruids_proc_check_sched,
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.mpo_proc_check_signal = mac_seeotheruids_proc_check_signal,
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.mpo_socket_check_visible = mac_seeotheruids_socket_check_visible,
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};
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MAC_POLICY_SET(&mac_seeotheruids_ops, mac_seeotheruids,
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"TrustedBSD MAC/seeotheruids", MPC_LOADTIME_FLAG_UNLOADOK, NULL);
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