774f51ad2c
be called without any vnode locks held. Remove calls to vn_start_write() and vn_finished_write() in vnode_pager_putpages() and add these calls before the vnode lock is obtained to most of the callers that don't already have them.
679 lines
16 KiB
C
679 lines
16 KiB
C
/*-
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* Copyright (c) 1999-2002 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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* 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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* 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/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 <sys/mac_policy.h>
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#include <security/mac/mac_internal.h>
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int mac_enforce_process = 1;
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SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW,
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&mac_enforce_process, 0, "Enforce MAC policy on inter-process operations");
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TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process);
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int mac_enforce_vm = 1;
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SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW,
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&mac_enforce_vm, 0, "Enforce MAC policy on vm operations");
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TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm);
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static int mac_mmap_revocation = 1;
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SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW,
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&mac_mmap_revocation, 0, "Revoke mmap access to files on subject "
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"relabel");
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static int mac_mmap_revocation_via_cow = 0;
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SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW,
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&mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via "
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"copy-on-write semantics, or by removing all write access");
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static int mac_enforce_suid = 1;
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SYSCTL_INT(_security_mac, OID_AUTO, enforce_suid, CTLFLAG_RW,
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&mac_enforce_suid, 0, "Enforce MAC policy on suid/sgid operations");
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TUNABLE_INT("security.mac.enforce_suid", &mac_enforce_suid);
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#ifdef MAC_DEBUG
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static unsigned int nmaccreds, nmacprocs;
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SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD,
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&nmaccreds, 0, "number of ucreds in use");
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SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, procs, CTLFLAG_RD,
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&nmacprocs, 0, "number of procs in use");
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#endif
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static void mac_cred_mmapped_drop_perms_recurse(struct thread *td,
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struct ucred *cred, struct vm_map *map);
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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_PERFORM(init_cred_label, label);
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MAC_DEBUG_COUNTER_INC(&nmaccreds);
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return (label);
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}
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void
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mac_init_cred(struct ucred *cred)
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{
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cred->cr_label = mac_cred_label_alloc();
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}
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static struct label *
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mac_proc_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_PERFORM(init_proc_label, label);
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MAC_DEBUG_COUNTER_INC(&nmacprocs);
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return (label);
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}
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void
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mac_init_proc(struct proc *p)
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{
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p->p_label = mac_proc_label_alloc();
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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_PERFORM(destroy_cred_label, label);
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mac_labelzone_free(label);
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MAC_DEBUG_COUNTER_DEC(&nmaccreds);
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}
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void
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mac_destroy_cred(struct ucred *cred)
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{
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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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static void
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mac_proc_label_free(struct label *label)
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{
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MAC_PERFORM(destroy_proc_label, label);
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mac_labelzone_free(label);
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MAC_DEBUG_COUNTER_DEC(&nmacprocs);
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}
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void
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mac_destroy_proc(struct proc *p)
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{
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mac_proc_label_free(p->p_label);
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p->p_label = NULL;
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}
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int
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mac_externalize_cred_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_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_internalize_cred_label(struct label *label, char *string)
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{
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int error;
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MAC_INTERNALIZE(cred, label, string);
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return (error);
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}
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/*
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* Initialize MAC label for the first kernel process, from which other
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* kernel processes and threads are spawned.
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*/
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void
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mac_create_proc0(struct ucred *cred)
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{
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MAC_PERFORM(create_proc0, 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_create_proc1(struct ucred *cred)
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{
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MAC_PERFORM(create_proc1, cred);
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}
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void
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mac_thread_userret(struct thread *td)
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{
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MAC_PERFORM(thread_userret, td);
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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 inheritence from the parent process, modulo possible
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* deltas. This function allows that processing to take place.
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*/
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void
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mac_copy_cred(struct ucred *src, struct ucred *dest)
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{
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MAC_PERFORM(copy_cred_label, src->cr_label, dest->cr_label);
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}
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int
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mac_execve_enter(struct image_params *imgp, struct mac *mac_p)
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{
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struct label *label;
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struct mac mac;
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char *buffer;
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int error;
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if (mac_p == NULL)
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return (0);
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error = copyin(mac_p, &mac, sizeof(mac));
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if (error)
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return (error);
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error = mac_check_structmac_consistent(&mac);
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if (error)
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return (error);
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL);
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if (error) {
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free(buffer, M_MACTEMP);
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return (error);
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}
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label = mac_cred_label_alloc();
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error = mac_internalize_cred_label(label, buffer);
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free(buffer, M_MACTEMP);
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if (error) {
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mac_cred_label_free(label);
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return (error);
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}
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imgp->execlabel = label;
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return (0);
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}
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void
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mac_execve_exit(struct image_params *imgp)
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{
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if (imgp->execlabel != NULL) {
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mac_cred_label_free(imgp->execlabel);
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imgp->execlabel = NULL;
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}
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}
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/*
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* When relabeling a process, call out to the policies for the maximum
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* permission allowed for each object type we know about in its
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* memory space, and revoke access (in the least surprising ways we
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* know) when necessary. The process lock is not held here.
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*/
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void
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mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred)
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{
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/* XXX freeze all other threads */
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mac_cred_mmapped_drop_perms_recurse(td, cred,
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&td->td_proc->p_vmspace->vm_map);
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/* XXX allow other threads to continue */
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}
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static __inline const char *
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prot2str(vm_prot_t prot)
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{
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switch (prot & VM_PROT_ALL) {
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case VM_PROT_READ:
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return ("r--");
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case VM_PROT_READ | VM_PROT_WRITE:
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return ("rw-");
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case VM_PROT_READ | VM_PROT_EXECUTE:
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return ("r-x");
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case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
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return ("rwx");
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case VM_PROT_WRITE:
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return ("-w-");
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case VM_PROT_EXECUTE:
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return ("--x");
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case VM_PROT_WRITE | VM_PROT_EXECUTE:
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return ("-wx");
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default:
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return ("---");
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}
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}
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static void
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mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
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struct vm_map *map)
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{
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struct vm_map_entry *vme;
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int vfslocked, result;
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vm_prot_t revokeperms;
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vm_object_t backing_object, object;
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vm_ooffset_t offset;
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struct vnode *vp;
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struct mount *mp;
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if (!mac_mmap_revocation)
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return;
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vm_map_lock_read(map);
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for (vme = map->header.next; vme != &map->header; vme = vme->next) {
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if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
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mac_cred_mmapped_drop_perms_recurse(td, cred,
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vme->object.sub_map);
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continue;
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}
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/*
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* Skip over entries that obviously are not shared.
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*/
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if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
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!vme->max_protection)
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continue;
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/*
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* Drill down to the deepest backing object.
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*/
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offset = vme->offset;
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object = vme->object.vm_object;
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if (object == NULL)
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continue;
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VM_OBJECT_LOCK(object);
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while ((backing_object = object->backing_object) != NULL) {
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VM_OBJECT_LOCK(backing_object);
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offset += object->backing_object_offset;
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VM_OBJECT_UNLOCK(object);
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object = backing_object;
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}
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VM_OBJECT_UNLOCK(object);
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/*
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* At the moment, vm_maps and objects aren't considered
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* by the MAC system, so only things with backing by a
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* normal object (read: vnodes) are checked.
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*/
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if (object->type != OBJT_VNODE)
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continue;
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vp = (struct vnode *)object->handle;
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vfslocked = VFS_LOCK_GIANT(vp->v_mount);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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result = vme->max_protection;
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mac_check_vnode_mmap_downgrade(cred, vp, &result);
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VOP_UNLOCK(vp, 0, td);
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/*
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* Find out what maximum protection we may be allowing
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* now but a policy needs to get removed.
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*/
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revokeperms = vme->max_protection & ~result;
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if (!revokeperms) {
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VFS_UNLOCK_GIANT(vfslocked);
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continue;
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}
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printf("pid %ld: revoking %s perms from %#lx:%ld "
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"(max %s/cur %s)\n", (long)td->td_proc->p_pid,
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prot2str(revokeperms), (u_long)vme->start,
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(long)(vme->end - vme->start),
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prot2str(vme->max_protection), prot2str(vme->protection));
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vm_map_lock_upgrade(map);
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/*
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* This is the really simple case: if a map has more
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* max_protection than is allowed, but it's not being
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* actually used (that is, the current protection is
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* still allowed), we can just wipe it out and do
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* nothing more.
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*/
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if ((vme->protection & revokeperms) == 0) {
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vme->max_protection -= revokeperms;
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} else {
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if (revokeperms & VM_PROT_WRITE) {
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/*
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* In the more complicated case, flush out all
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* pending changes to the object then turn it
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* copy-on-write.
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*/
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vm_object_reference(object);
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(void) vn_start_write(vp, &mp, V_WAIT);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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VM_OBJECT_LOCK(object);
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vm_object_page_clean(object,
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OFF_TO_IDX(offset),
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OFF_TO_IDX(offset + vme->end - vme->start +
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PAGE_MASK),
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OBJPC_SYNC);
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VM_OBJECT_UNLOCK(object);
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VOP_UNLOCK(vp, 0, td);
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vn_finished_write(mp);
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vm_object_deallocate(object);
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/*
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* Why bother if there's no read permissions
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* anymore? For the rest, we need to leave
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* the write permissions on for COW, or
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* remove them entirely if configured to.
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*/
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if (!mac_mmap_revocation_via_cow) {
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vme->max_protection &= ~VM_PROT_WRITE;
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vme->protection &= ~VM_PROT_WRITE;
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} if ((revokeperms & VM_PROT_READ) == 0)
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vme->eflags |= MAP_ENTRY_COW |
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MAP_ENTRY_NEEDS_COPY;
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}
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if (revokeperms & VM_PROT_EXECUTE) {
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vme->max_protection &= ~VM_PROT_EXECUTE;
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vme->protection &= ~VM_PROT_EXECUTE;
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}
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if (revokeperms & VM_PROT_READ) {
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vme->max_protection = 0;
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vme->protection = 0;
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}
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pmap_protect(map->pmap, vme->start, vme->end,
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vme->protection & ~revokeperms);
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vm_map_simplify_entry(map, vme);
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}
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vm_map_lock_downgrade(map);
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VFS_UNLOCK_GIANT(vfslocked);
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}
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vm_map_unlock_read(map);
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}
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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_relabel_cred(struct ucred *cred, struct label *newlabel)
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{
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MAC_PERFORM(relabel_cred, cred, newlabel);
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}
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|
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int
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mac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
|
|
{
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int error;
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MAC_CHECK(check_cred_relabel, cred, newlabel);
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return (error);
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}
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int
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mac_check_cred_visible(struct ucred *u1, struct ucred *u2)
|
|
{
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int error;
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if (!mac_enforce_process)
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return (0);
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MAC_CHECK(check_cred_visible, u1, u2);
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return (error);
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}
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int
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mac_check_proc_debug(struct ucred *cred, struct proc *proc)
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{
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int error;
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PROC_LOCK_ASSERT(proc, MA_OWNED);
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if (!mac_enforce_process)
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return (0);
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MAC_CHECK(check_proc_debug, cred, proc);
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return (error);
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}
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int
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mac_check_proc_sched(struct ucred *cred, struct proc *proc)
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{
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int error;
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PROC_LOCK_ASSERT(proc, MA_OWNED);
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if (!mac_enforce_process)
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return (0);
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MAC_CHECK(check_proc_sched, cred, proc);
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return (error);
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}
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int
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mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum)
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{
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|
int error;
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PROC_LOCK_ASSERT(proc, MA_OWNED);
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|
|
if (!mac_enforce_process)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_signal, cred, proc, signum);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_setuid(struct proc *proc, struct ucred *cred, uid_t uid)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_suid)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_setuid, cred, uid);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_seteuid(struct proc *proc, struct ucred *cred, uid_t euid)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_suid)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_seteuid, cred, euid);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_setgid(struct proc *proc, struct ucred *cred, gid_t gid)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_suid)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_setgid, cred, gid);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_setegid(struct proc *proc, struct ucred *cred, gid_t egid)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_suid)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_setegid, cred, egid);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_setgroups(struct proc *proc, struct ucred *cred,
|
|
int ngroups, gid_t *gidset)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_suid)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_setgroups, cred, ngroups, gidset);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_setreuid(struct proc *proc, struct ucred *cred, uid_t ruid,
|
|
uid_t euid)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_suid)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_setreuid, cred, ruid, euid);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_setregid(struct proc *proc, struct ucred *cred, gid_t rgid,
|
|
gid_t egid)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_suid)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_setregid, cred, rgid, egid);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_setresuid(struct proc *proc, struct ucred *cred, uid_t ruid,
|
|
uid_t euid, uid_t suid)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_suid)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_setresuid, cred, ruid, euid, suid);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_setresgid(struct proc *proc, struct ucred *cred, gid_t rgid,
|
|
gid_t egid, gid_t sgid)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_suid)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_setresgid, cred, rgid, egid, sgid);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_proc_wait(struct ucred *cred, struct proc *proc)
|
|
{
|
|
int error;
|
|
|
|
PROC_LOCK_ASSERT(proc, MA_OWNED);
|
|
|
|
if (!mac_enforce_process)
|
|
return (0);
|
|
|
|
MAC_CHECK(check_proc_wait, cred, proc);
|
|
|
|
return (error);
|
|
}
|