Provide a simple sample labeled access control policy, mac_partition.
This policy can be loaded dynamically, and assigns each process a partition number, as well as permitting processes to operate outside the partition. Processes contained in a partition can only "see" processes inside the same partition, so it's a little like jail. The partition of a user can be set using the label mechanisms in login.conf. This sample policy is a good starting point for developers wanting to learn about how to produce labeled policies, as it labels only one kernel object, the process credential. Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
This commit is contained in:
Robert Watson
parent
5136300015
commit
8c7327e183
288
sys/security/mac_partition/mac_partition.c
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288
sys/security/mac_partition/mac_partition.c
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/*-
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* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
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* Copyright (c) 2001, 2002 Networks Associates Technology, 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 NAI Labs,
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* the Security Research Division of Network Associates, Inc. under
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* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
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* CHATS research program.
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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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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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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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* Experiment with a partition-like model.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/mac.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/sysent.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <fs/devfs/devfs.h>
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#include <net/bpfdesc.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <vm/vm.h>
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#include <sys/mac_policy.h>
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#include <security/mac_partition/mac_partition.h>
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SYSCTL_DECL(_security_mac);
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SYSCTL_NODE(_security_mac, OID_AUTO, partition, CTLFLAG_RW, 0,
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"TrustedBSD mac_partition policy controls");
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static int mac_partition_enabled = 1;
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SYSCTL_INT(_security_mac_partition, OID_AUTO, enabled, CTLFLAG_RW,
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&mac_partition_enabled, 0, "Enforce partition policy");
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static int partition_slot;
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#define SLOT(l) (LABEL_TO_SLOT((l), partition_slot).l_long)
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static void
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mac_partition_init(struct mac_policy_conf *conf)
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{
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}
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static void
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mac_partition_init_label(struct label *label)
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{
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SLOT(label) = 0;
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}
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static void
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mac_partition_destroy_label(struct label *label)
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{
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SLOT(label) = 0;
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}
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static int
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mac_partition_externalize_label(struct label *label, char *element_name,
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char *element_data, size_t size, size_t *len, int *claimed)
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{
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if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0)
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return (0);
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(*claimed)++;
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*len = snprintf(element_data, size, "%ld", SLOT(label));
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return (0);
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}
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static int
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mac_partition_internalize_label(struct label *label, char *element_name,
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char *element_data, int *claimed)
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{
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if (strcmp(MAC_PARTITION_LABEL_NAME, element_name) != 0)
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return (0);
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(*claimed)++;
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SLOT(label) = strtol(element_data, NULL, 10);
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return (0);
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}
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static void
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mac_partition_create_cred(struct ucred *cred_parent, struct ucred *cred_child)
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{
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SLOT(&cred_child->cr_label) = SLOT(&cred_parent->cr_label);
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}
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static void
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mac_partition_create_proc0(struct ucred *cred)
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{
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SLOT(&cred->cr_label) = 0;
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}
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static void
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mac_partition_create_proc1(struct ucred *cred)
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{
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SLOT(&cred->cr_label) = 0;
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}
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static void
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mac_partition_relabel_cred(struct ucred *cred, struct label *newlabel)
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{
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if (SLOT(newlabel) != 0)
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SLOT(&cred->cr_label) = SLOT(newlabel);
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}
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static int
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label_on_label(struct label *subject, struct label *object)
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{
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if (mac_partition_enabled == 0)
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return (0);
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if (SLOT(subject) == 0)
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return (0);
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if (SLOT(subject) == SLOT(object))
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return (0);
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return (EPERM);
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}
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static int
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mac_partition_check_cred_relabel(struct ucred *cred, struct label *newlabel)
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{
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int error;
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error = 0;
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/* Treat "0" as a no-op request. */
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if (SLOT(newlabel) != 0) {
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/* If we're already in a partition, can't repartition. */
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if (SLOT(&cred->cr_label) != 0)
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return (EPERM);
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/*
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* If not in a partition, must have privilege to create
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* one.
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*/
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error = suser_cred(cred, 0);
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}
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return (error);
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}
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static int
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mac_partition_check_cred_visible(struct ucred *u1, struct ucred *u2)
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{
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int error;
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error = label_on_label(&u1->cr_label, &u2->cr_label);
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return (error == 0 ? 0 : ESRCH);
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}
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static int
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mac_partition_check_proc_debug(struct ucred *cred, struct proc *proc)
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{
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int error;
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error = label_on_label(&cred->cr_label, &proc->p_ucred->cr_label);
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return (error ? ESRCH : 0);
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}
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static int
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mac_partition_check_proc_sched(struct ucred *cred, struct proc *proc)
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{
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int error;
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error = label_on_label(&cred->cr_label, &proc->p_ucred->cr_label);
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return (error ? ESRCH : 0);
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}
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static int
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mac_partition_check_proc_signal(struct ucred *cred, struct proc *proc,
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int signum)
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{
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int error;
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error = label_on_label(&cred->cr_label, &proc->p_ucred->cr_label);
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return (error ? ESRCH : 0);
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}
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static int
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mac_partition_check_socket_visible(struct ucred *cred, struct socket *socket,
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struct label *socketlabel)
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{
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int error;
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error = label_on_label(&cred->cr_label, socketlabel);
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return (error ? ENOENT : 0);
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}
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static struct mac_policy_op_entry mac_partition_ops[] =
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{
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{ MAC_INIT,
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(macop_t)mac_partition_init },
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{ MAC_INIT_CRED_LABEL,
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(macop_t)mac_partition_init_label },
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{ MAC_DESTROY_CRED_LABEL,
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(macop_t)mac_partition_destroy_label },
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{ MAC_EXTERNALIZE_CRED_LABEL,
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(macop_t)mac_partition_externalize_label },
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{ MAC_INTERNALIZE_CRED_LABEL,
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(macop_t)mac_partition_internalize_label },
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{ MAC_CREATE_CRED,
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(macop_t)mac_partition_create_cred },
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{ MAC_CREATE_PROC0,
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(macop_t)mac_partition_create_proc0 },
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{ MAC_CREATE_PROC1,
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(macop_t)mac_partition_create_proc1 },
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{ MAC_RELABEL_CRED,
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(macop_t)mac_partition_relabel_cred },
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{ MAC_CHECK_CRED_RELABEL,
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(macop_t)mac_partition_check_cred_relabel },
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{ MAC_CHECK_CRED_VISIBLE,
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(macop_t)mac_partition_check_cred_visible },
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{ MAC_CHECK_PROC_DEBUG,
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(macop_t)mac_partition_check_proc_debug },
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{ MAC_CHECK_PROC_SCHED,
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(macop_t)mac_partition_check_proc_sched },
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{ MAC_CHECK_PROC_SIGNAL,
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(macop_t)mac_partition_check_proc_signal },
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{ MAC_CHECK_SOCKET_VISIBLE,
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(macop_t)mac_partition_check_socket_visible },
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{ MAC_OP_LAST, NULL }
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};
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MAC_POLICY_SET(mac_partition_ops, trustedbsd_mac_partition,
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"TrustedBSD MAC/Partition", MPC_LOADTIME_FLAG_UNLOADOK, &partition_slot);
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49
sys/security/mac_partition/mac_partition.h
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49
sys/security/mac_partition/mac_partition.h
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@ -0,0 +1,49 @@
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/*-
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* Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson
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* Copyright (c) 2001, 2002 Networks Associates Technology, 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 NAI Labs,
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* the Security Research Division of Network Associates, Inc. under
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* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
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* CHATS research program.
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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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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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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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* Definitions for the TrustedBSD partition policy module.
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*/
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#ifndef _SYS_SECURITY_MAC_PARTITION_H
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#define _SYS_SECURITY_MAC_PARTITION_H
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#define MAC_PARTITION_LABEL_NAME "partition"
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#endif /* !_SYS_SECURITY_MAC_PARTITION_H */
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