353 lines
8.7 KiB
C
353 lines
8.7 KiB
C
/*-
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* Copyright (c) 1999-2002, 2008-2009 Robert N. M. Watson
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* Copyright (c) 2001 Ilmar S. Habibulin
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* Copyright (c) 2001-2003 Networks Associates Technology, Inc.
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* Copyright (c) 2005 Samy Al Bahra
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* Copyright (c) 2006 SPARTA, Inc.
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* Copyright (c) 2008 Apple Inc.
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* All rights reserved.
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*
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* This software was developed by Robert Watson and Ilmar Habibulin for the
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* 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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* This software was developed at the University of Cambridge Computer
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* Laboratory with support from a grant from Google, Inc.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/condvar.h>
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#include <sys/imgact.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/mac.h>
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#include <sys/proc.h>
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#include <sys/sbuf.h>
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#include <sys/sdt.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/file.h>
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#include <sys/namei.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <security/mac/mac_framework.h>
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#include <security/mac/mac_internal.h>
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#include <security/mac/mac_policy.h>
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struct label *
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mac_cred_label_alloc(void)
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{
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struct label *label;
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label = mac_labelzone_alloc(M_WAITOK);
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MAC_POLICY_PERFORM(cred_init_label, label);
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return (label);
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}
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void
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mac_cred_init(struct ucred *cred)
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{
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if (mac_labeled & MPC_OBJECT_CRED)
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cred->cr_label = mac_cred_label_alloc();
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else
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cred->cr_label = NULL;
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}
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void
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mac_cred_label_free(struct label *label)
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{
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MAC_POLICY_PERFORM_NOSLEEP(cred_destroy_label, label);
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mac_labelzone_free(label);
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}
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void
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mac_cred_destroy(struct ucred *cred)
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{
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if (cred->cr_label != NULL) {
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mac_cred_label_free(cred->cr_label);
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cred->cr_label = NULL;
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}
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}
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/*
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* When a thread becomes an NFS server daemon, its credential may need to be
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* updated to reflect this so that policies can recognize when file system
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* operations originate from the network.
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*
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* At some point, it would be desirable if the credential used for each NFS
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* RPC could be set based on the RPC context (i.e., source system, etc) to
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* provide more fine-grained access control.
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*/
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void
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mac_cred_associate_nfsd(struct ucred *cred)
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{
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MAC_POLICY_PERFORM_NOSLEEP(cred_associate_nfsd, cred);
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}
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/*
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* Initialize MAC label for the first kernel process, from which other kernel
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* processes and threads are spawned.
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*/
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void
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mac_cred_create_swapper(struct ucred *cred)
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{
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MAC_POLICY_PERFORM_NOSLEEP(cred_create_swapper, cred);
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}
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/*
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* Initialize MAC label for the first userland process, from which other
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* userland processes and threads are spawned.
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*/
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void
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mac_cred_create_init(struct ucred *cred)
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{
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MAC_POLICY_PERFORM_NOSLEEP(cred_create_init, cred);
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}
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int
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mac_cred_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen)
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{
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int error;
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MAC_POLICY_EXTERNALIZE(cred, label, elements, outbuf, outbuflen);
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return (error);
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}
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int
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mac_cred_internalize_label(struct label *label, char *string)
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{
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int error;
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MAC_POLICY_INTERNALIZE(cred, label, string);
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return (error);
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}
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/*
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* When a new process is created, its label must be initialized. Generally,
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* this involves inheritance from the parent process, modulo possible deltas.
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* This function allows that processing to take place.
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*/
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void
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mac_cred_copy(struct ucred *src, struct ucred *dest)
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{
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MAC_POLICY_PERFORM_NOSLEEP(cred_copy_label, src->cr_label,
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dest->cr_label);
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}
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/*
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* When the subject's label changes, it may require revocation of privilege
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* to mapped objects. This can't be done on-the-fly later with a unified
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* buffer cache.
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*/
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void
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mac_cred_relabel(struct ucred *cred, struct label *newlabel)
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{
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MAC_POLICY_PERFORM_NOSLEEP(cred_relabel, cred, newlabel);
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}
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MAC_CHECK_PROBE_DEFINE2(cred_check_relabel, "struct ucred *",
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"struct label *");
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int
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mac_cred_check_relabel(struct ucred *cred, struct label *newlabel)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_relabel, cred, newlabel);
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MAC_CHECK_PROBE2(cred_check_relabel, error, cred, newlabel);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(cred_check_setuid, "struct ucred *", "uid_t");
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int
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mac_cred_check_setuid(struct ucred *cred, uid_t uid)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_setuid, cred, uid);
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MAC_CHECK_PROBE2(cred_check_setuid, error, cred, uid);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(cred_check_seteuid, "struct ucred *", "uid_t");
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int
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mac_cred_check_seteuid(struct ucred *cred, uid_t euid)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_seteuid, cred, euid);
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MAC_CHECK_PROBE2(cred_check_seteuid, error, cred, euid);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(cred_check_setgid, "struct ucred *", "gid_t");
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int
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mac_cred_check_setgid(struct ucred *cred, gid_t gid)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_setgid, cred, gid);
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MAC_CHECK_PROBE2(cred_check_setgid, error, cred, gid);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(cred_check_setegid, "struct ucred *", "gid_t");
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int
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mac_cred_check_setegid(struct ucred *cred, gid_t egid)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_setegid, cred, egid);
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MAC_CHECK_PROBE2(cred_check_setegid, error, cred, egid);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE3(cred_check_setgroups, "struct ucred *", "int",
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"gid_t *");
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int
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mac_cred_check_setgroups(struct ucred *cred, int ngroups, gid_t *gidset)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_setgroups, cred, ngroups, gidset);
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MAC_CHECK_PROBE3(cred_check_setgroups, error, cred, ngroups, gidset);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE3(cred_check_setreuid, "struct ucred *", "uid_t",
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"uid_t");
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int
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mac_cred_check_setreuid(struct ucred *cred, uid_t ruid, uid_t euid)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_setreuid, cred, ruid, euid);
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MAC_CHECK_PROBE3(cred_check_setreuid, error, cred, ruid, euid);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE3(cred_check_setregid, "struct ucred *", "gid_t",
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"gid_t");
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int
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mac_cred_check_setregid(struct ucred *cred, gid_t rgid, gid_t egid)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_setregid, cred, rgid, egid);
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MAC_CHECK_PROBE3(cred_check_setregid, error, cred, rgid, egid);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE4(cred_check_setresuid, "struct ucred *", "uid_t",
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"uid_t", "uid_t");
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int
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mac_cred_check_setresuid(struct ucred *cred, uid_t ruid, uid_t euid,
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uid_t suid)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_setresuid, cred, ruid, euid, suid);
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MAC_CHECK_PROBE4(cred_check_setresuid, error, cred, ruid, euid,
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suid);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE4(cred_check_setresgid, "struct ucred *", "gid_t",
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"gid_t", "gid_t");
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int
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mac_cred_check_setresgid(struct ucred *cred, gid_t rgid, gid_t egid,
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gid_t sgid)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_setresgid, cred, rgid, egid, sgid);
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MAC_CHECK_PROBE4(cred_check_setresgid, error, cred, rgid, egid,
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sgid);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(cred_check_visible, "struct ucred *",
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"struct ucred *");
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int
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mac_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
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{
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int error;
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MAC_POLICY_CHECK_NOSLEEP(cred_check_visible, cr1, cr2);
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MAC_CHECK_PROBE2(cred_check_visible, error, cr1, cr2);
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return (error);
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}
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