56d9e93207
and the mpo_create_cred() MAC policy entry point to mpo_copy_cred_label(). This is more consistent with similar entry points for creation and label copying, as mac_create_cred() was called from crdup() as opposed to during process creation. For a number of policies, this removes the requirement for special handling when copying credential labels, and improves consistency. Approved by: re (scottl) Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
291 lines
7.2 KiB
C
291 lines
7.2 KiB
C
/*-
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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 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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* 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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* 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/sbuf.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 void
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mac_partition_copy_label(struct label *src, struct label *dest)
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{
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SLOT(dest) = SLOT(src);
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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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struct sbuf *sb, 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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if (sbuf_printf(sb, "%ld", SLOT(label)) == -1)
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return (EINVAL);
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else
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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_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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/*
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* Require BSD privilege in order to change the partition.
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* Originally we also required that the process not be
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* in a partition in the first place, but this didn't
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* interact well with sendmail.
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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 int
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mac_partition_check_vnode_exec(struct ucred *cred, struct vnode *vp,
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struct label *label, struct image_params *imgp, struct label *execlabel)
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{
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if (execlabel != NULL) {
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/*
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* We currently don't permit labels to be changed at
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* exec-time as part of the partition model, so disallow
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* non-NULL partition label changes in execlabel.
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*/
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if (SLOT(execlabel) != 0)
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return (EINVAL);
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}
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return (0);
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}
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static struct mac_policy_ops mac_partition_ops =
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{
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.mpo_init = mac_partition_init,
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.mpo_init_cred_label = mac_partition_init_label,
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.mpo_destroy_cred_label = mac_partition_destroy_label,
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.mpo_copy_cred_label = mac_partition_copy_label,
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.mpo_externalize_cred_label = mac_partition_externalize_label,
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.mpo_internalize_cred_label = mac_partition_internalize_label,
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.mpo_create_proc0 = mac_partition_create_proc0,
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.mpo_create_proc1 = mac_partition_create_proc1,
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.mpo_relabel_cred = mac_partition_relabel_cred,
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.mpo_check_cred_relabel = mac_partition_check_cred_relabel,
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.mpo_check_cred_visible = mac_partition_check_cred_visible,
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.mpo_check_proc_debug = mac_partition_check_proc_debug,
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.mpo_check_proc_sched = mac_partition_check_proc_sched,
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.mpo_check_proc_signal = mac_partition_check_proc_signal,
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.mpo_check_socket_visible = mac_partition_check_socket_visible,
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.mpo_check_vnode_exec = mac_partition_check_vnode_exec,
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};
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MAC_POLICY_SET(&mac_partition_ops, mac_partition, "TrustedBSD MAC/Partition",
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MPC_LOADTIME_FLAG_UNLOADOK, &partition_slot);
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