6356dba0b4
(1) Abstract interpreter vnode labeling in execve(2) and mac_execve(2)
so that the general exec code isn't aware of the details of
allocating, copying, and freeing labels, rather, simply passes in
a void pointer to start and stop functions that will be used by
the framework. This change will be MFC'd.
(2) Introduce a new flags field to the MAC_POLICY_SET(9) interface
allowing policies to declare which types of objects require label
allocation, initialization, and destruction, and define a set of
flags covering various supported object types (MPC_OBJECT_PROC,
MPC_OBJECT_VNODE, MPC_OBJECT_INPCB, ...). This change reduces the
overhead of compiling the MAC Framework into the kernel if policies
aren't loaded, or if policies require labels on only a small number
or even no object types. Each time a policy is loaded or unloaded,
we recalculate a mask of labeled object types across all policies
present in the system. Eliminate MAC_ALWAYS_LABEL_MBUF option as it
is no longer required.
MFC after: 1 week ((1) only)
Reviewed by: csjp
Obtained from: TrustedBSD Project
Sponsored by: Apple, Inc.
732 lines
16 KiB
C
732 lines
16 KiB
C
/*-
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* Copyright (c) 1999-2002, 2006 Robert N. M. Watson
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* Copyright (c) 2001 Ilmar S. Habibulin
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* Copyright (c) 2001-2005 Networks Associates Technology, Inc.
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* Copyright (c) 2005-2006 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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* 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/fcntl.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/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/mount.h>
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#include <sys/file.h>
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#include <sys/namei.h>
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#include <sys/socket.h>
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#include <sys/pipe.h>
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#include <sys/socketvar.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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#ifdef MAC
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int
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__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap)
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{
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char *elements, *buffer;
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struct mac mac;
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struct proc *tproc;
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struct ucred *tcred;
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int error;
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error = copyin(uap->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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tproc = pfind(uap->pid);
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if (tproc == NULL)
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return (ESRCH);
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tcred = NULL; /* Satisfy gcc. */
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error = p_cansee(td, tproc);
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if (error == 0)
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tcred = crhold(tproc->p_ucred);
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PROC_UNLOCK(tproc);
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if (error)
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return (error);
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elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL);
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if (error) {
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free(elements, M_MACTEMP);
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crfree(tcred);
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return (error);
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}
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
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error = mac_cred_externalize_label(tcred->cr_label, elements,
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buffer, mac.m_buflen);
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if (error == 0)
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error = copyout(buffer, mac.m_string, strlen(buffer)+1);
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free(buffer, M_MACTEMP);
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free(elements, M_MACTEMP);
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crfree(tcred);
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return (error);
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}
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int
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__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
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{
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char *elements, *buffer;
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struct mac mac;
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int error;
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error = copyin(uap->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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elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL);
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if (error) {
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free(elements, M_MACTEMP);
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return (error);
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}
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
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error = mac_cred_externalize_label(td->td_ucred->cr_label,
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elements, buffer, mac.m_buflen);
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if (error == 0)
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error = copyout(buffer, mac.m_string, strlen(buffer)+1);
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free(buffer, M_MACTEMP);
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free(elements, M_MACTEMP);
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return (error);
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}
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int
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__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
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{
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struct ucred *newcred, *oldcred;
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struct label *intlabel;
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struct proc *p;
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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_labeled & MPC_OBJECT_CRED))
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return (EINVAL);
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error = copyin(uap->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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intlabel = mac_cred_label_alloc();
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error = mac_cred_internalize_label(intlabel, buffer);
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free(buffer, M_MACTEMP);
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if (error)
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goto out;
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newcred = crget();
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p = td->td_proc;
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PROC_LOCK(p);
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oldcred = p->p_ucred;
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error = mac_cred_check_relabel(oldcred, intlabel);
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if (error) {
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PROC_UNLOCK(p);
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crfree(newcred);
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goto out;
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}
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setsugid(p);
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crcopy(newcred, oldcred);
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mac_cred_relabel(newcred, intlabel);
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p->p_ucred = newcred;
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/*
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* Grab additional reference for use while revoking mmaps, prior to
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* releasing the proc lock and sharing the cred.
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*/
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crhold(newcred);
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PROC_UNLOCK(p);
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mac_cred_mmapped_drop_perms(td, newcred);
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crfree(newcred); /* Free revocation reference. */
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crfree(oldcred);
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out:
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mac_cred_label_free(intlabel);
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return (error);
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}
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int
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__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
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{
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char *elements, *buffer;
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struct label *intlabel;
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struct file *fp;
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struct mac mac;
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struct vnode *vp;
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struct pipe *pipe;
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struct socket *so;
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short label_type;
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int vfslocked, error;
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error = copyin(uap->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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elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL);
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if (error) {
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free(elements, M_MACTEMP);
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return (error);
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}
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
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error = fget(td, uap->fd, &fp);
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if (error)
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goto out;
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label_type = fp->f_type;
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switch (fp->f_type) {
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case DTYPE_FIFO:
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case DTYPE_VNODE:
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if (!(mac_labeled & MPC_OBJECT_VNODE))
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return (EINVAL);
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vp = fp->f_vnode;
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intlabel = mac_vnode_label_alloc();
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vfslocked = VFS_LOCK_GIANT(vp->v_mount);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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mac_vnode_copy_label(vp->v_label, intlabel);
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VOP_UNLOCK(vp, 0);
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VFS_UNLOCK_GIANT(vfslocked);
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error = mac_vnode_externalize_label(intlabel, elements,
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buffer, mac.m_buflen);
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mac_vnode_label_free(intlabel);
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break;
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case DTYPE_PIPE:
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if (!(mac_labeled & MPC_OBJECT_PIPE))
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return (EINVAL);
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pipe = fp->f_data;
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intlabel = mac_pipe_label_alloc();
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PIPE_LOCK(pipe);
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mac_pipe_copy_label(pipe->pipe_pair->pp_label, intlabel);
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PIPE_UNLOCK(pipe);
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error = mac_pipe_externalize_label(intlabel, elements,
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buffer, mac.m_buflen);
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mac_pipe_label_free(intlabel);
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break;
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case DTYPE_SOCKET:
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if (!(mac_labeled & MPC_OBJECT_SOCKET))
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return (EINVAL);
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so = fp->f_data;
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intlabel = mac_socket_label_alloc(M_WAITOK);
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SOCK_LOCK(so);
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mac_socket_copy_label(so->so_label, intlabel);
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SOCK_UNLOCK(so);
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error = mac_socket_externalize_label(intlabel, elements,
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buffer, mac.m_buflen);
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mac_socket_label_free(intlabel);
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break;
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default:
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error = EINVAL;
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}
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fdrop(fp, td);
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if (error == 0)
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error = copyout(buffer, mac.m_string, strlen(buffer)+1);
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out:
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free(buffer, M_MACTEMP);
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free(elements, M_MACTEMP);
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return (error);
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}
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int
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__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
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{
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char *elements, *buffer;
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struct nameidata nd;
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struct label *intlabel;
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struct mac mac;
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int vfslocked, error;
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if (!(mac_labeled & MPC_OBJECT_VNODE))
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return (EINVAL);
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error = copyin(uap->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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elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL);
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if (error) {
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free(elements, M_MACTEMP);
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return (error);
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}
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
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NDINIT(&nd, LOOKUP, MPSAFE | LOCKLEAF | FOLLOW, UIO_USERSPACE,
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uap->path_p, td);
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error = namei(&nd);
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if (error)
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goto out;
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intlabel = mac_vnode_label_alloc();
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vfslocked = NDHASGIANT(&nd);
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mac_vnode_copy_label(nd.ni_vp->v_label, intlabel);
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error = mac_vnode_externalize_label(intlabel, elements, buffer,
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mac.m_buflen);
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NDFREE(&nd, 0);
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VFS_UNLOCK_GIANT(vfslocked);
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mac_vnode_label_free(intlabel);
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if (error == 0)
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error = copyout(buffer, mac.m_string, strlen(buffer)+1);
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out:
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free(buffer, M_MACTEMP);
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free(elements, M_MACTEMP);
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return (error);
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}
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int
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__mac_get_link(struct thread *td, struct __mac_get_link_args *uap)
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{
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char *elements, *buffer;
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struct nameidata nd;
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struct label *intlabel;
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struct mac mac;
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int vfslocked, error;
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if (!(mac_labeled & MPC_OBJECT_VNODE))
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return (EINVAL);
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error = copyin(uap->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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elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL);
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if (error) {
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free(elements, M_MACTEMP);
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return (error);
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}
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
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NDINIT(&nd, LOOKUP, MPSAFE | LOCKLEAF | NOFOLLOW, UIO_USERSPACE,
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uap->path_p, td);
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error = namei(&nd);
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if (error)
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goto out;
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intlabel = mac_vnode_label_alloc();
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vfslocked = NDHASGIANT(&nd);
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mac_vnode_copy_label(nd.ni_vp->v_label, intlabel);
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error = mac_vnode_externalize_label(intlabel, elements, buffer,
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mac.m_buflen);
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NDFREE(&nd, 0);
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VFS_UNLOCK_GIANT(vfslocked);
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mac_vnode_label_free(intlabel);
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if (error == 0)
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error = copyout(buffer, mac.m_string, strlen(buffer)+1);
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out:
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free(buffer, M_MACTEMP);
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free(elements, M_MACTEMP);
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return (error);
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}
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int
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__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
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{
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struct label *intlabel;
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struct pipe *pipe;
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struct socket *so;
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struct file *fp;
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struct mount *mp;
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struct vnode *vp;
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struct mac mac;
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char *buffer;
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int error, vfslocked;
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error = copyin(uap->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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error = fget(td, uap->fd, &fp);
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if (error)
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goto out;
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switch (fp->f_type) {
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case DTYPE_FIFO:
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case DTYPE_VNODE:
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if (!(mac_labeled & MPC_OBJECT_VNODE))
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return (EINVAL);
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intlabel = mac_vnode_label_alloc();
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error = mac_vnode_internalize_label(intlabel, buffer);
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if (error) {
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mac_vnode_label_free(intlabel);
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break;
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}
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vp = fp->f_vnode;
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vfslocked = VFS_LOCK_GIANT(vp->v_mount);
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error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
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if (error != 0) {
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VFS_UNLOCK_GIANT(vfslocked);
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mac_vnode_label_free(intlabel);
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break;
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}
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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error = vn_setlabel(vp, intlabel, td->td_ucred);
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VOP_UNLOCK(vp, 0);
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vn_finished_write(mp);
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VFS_UNLOCK_GIANT(vfslocked);
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mac_vnode_label_free(intlabel);
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break;
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case DTYPE_PIPE:
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if (!(mac_labeled & MPC_OBJECT_PIPE))
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return (EINVAL);
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intlabel = mac_pipe_label_alloc();
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error = mac_pipe_internalize_label(intlabel, buffer);
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if (error == 0) {
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pipe = fp->f_data;
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PIPE_LOCK(pipe);
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error = mac_pipe_label_set(td->td_ucred,
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pipe->pipe_pair, intlabel);
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PIPE_UNLOCK(pipe);
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}
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mac_pipe_label_free(intlabel);
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break;
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case DTYPE_SOCKET:
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if (!(mac_labeled & MPC_OBJECT_SOCKET))
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return (EINVAL);
|
|
intlabel = mac_socket_label_alloc(M_WAITOK);
|
|
error = mac_socket_internalize_label(intlabel, buffer);
|
|
if (error == 0) {
|
|
so = fp->f_data;
|
|
error = mac_socket_label_set(td->td_ucred, so,
|
|
intlabel);
|
|
}
|
|
mac_socket_label_free(intlabel);
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
}
|
|
fdrop(fp, td);
|
|
out:
|
|
free(buffer, M_MACTEMP);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
|
|
{
|
|
struct label *intlabel;
|
|
struct nameidata nd;
|
|
struct mount *mp;
|
|
struct mac mac;
|
|
char *buffer;
|
|
int vfslocked, error;
|
|
|
|
if (!(mac_labeled & MPC_OBJECT_VNODE))
|
|
return (EINVAL);
|
|
|
|
error = copyin(uap->mac_p, &mac, sizeof(mac));
|
|
if (error)
|
|
return (error);
|
|
|
|
error = mac_check_structmac_consistent(&mac);
|
|
if (error)
|
|
return (error);
|
|
|
|
buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
|
|
error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL);
|
|
if (error) {
|
|
free(buffer, M_MACTEMP);
|
|
return (error);
|
|
}
|
|
|
|
intlabel = mac_vnode_label_alloc();
|
|
error = mac_vnode_internalize_label(intlabel, buffer);
|
|
free(buffer, M_MACTEMP);
|
|
if (error)
|
|
goto out;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE | LOCKLEAF | FOLLOW, UIO_USERSPACE,
|
|
uap->path_p, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
|
|
if (error == 0) {
|
|
error = vn_setlabel(nd.ni_vp, intlabel,
|
|
td->td_ucred);
|
|
vn_finished_write(mp);
|
|
}
|
|
}
|
|
|
|
NDFREE(&nd, 0);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
out:
|
|
mac_vnode_label_free(intlabel);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
__mac_set_link(struct thread *td, struct __mac_set_link_args *uap)
|
|
{
|
|
struct label *intlabel;
|
|
struct nameidata nd;
|
|
struct mount *mp;
|
|
struct mac mac;
|
|
char *buffer;
|
|
int vfslocked, error;
|
|
|
|
if (!(mac_labeled & MPC_OBJECT_VNODE))
|
|
return (EINVAL);
|
|
|
|
error = copyin(uap->mac_p, &mac, sizeof(mac));
|
|
if (error)
|
|
return (error);
|
|
|
|
error = mac_check_structmac_consistent(&mac);
|
|
if (error)
|
|
return (error);
|
|
|
|
buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
|
|
error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL);
|
|
if (error) {
|
|
free(buffer, M_MACTEMP);
|
|
return (error);
|
|
}
|
|
|
|
intlabel = mac_vnode_label_alloc();
|
|
error = mac_vnode_internalize_label(intlabel, buffer);
|
|
free(buffer, M_MACTEMP);
|
|
if (error)
|
|
goto out;
|
|
|
|
NDINIT(&nd, LOOKUP, MPSAFE | LOCKLEAF | NOFOLLOW, UIO_USERSPACE,
|
|
uap->path_p, td);
|
|
error = namei(&nd);
|
|
vfslocked = NDHASGIANT(&nd);
|
|
if (error == 0) {
|
|
error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
|
|
if (error == 0) {
|
|
error = vn_setlabel(nd.ni_vp, intlabel,
|
|
td->td_ucred);
|
|
vn_finished_write(mp);
|
|
}
|
|
}
|
|
|
|
NDFREE(&nd, 0);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
out:
|
|
mac_vnode_label_free(intlabel);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_syscall(struct thread *td, struct mac_syscall_args *uap)
|
|
{
|
|
struct mac_policy_conf *mpc;
|
|
char target[MAC_MAX_POLICY_NAME];
|
|
int entrycount, error;
|
|
|
|
error = copyinstr(uap->policy, target, sizeof(target), NULL);
|
|
if (error)
|
|
return (error);
|
|
|
|
error = ENOSYS;
|
|
LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) {
|
|
if (strcmp(mpc->mpc_name, target) == 0 &&
|
|
mpc->mpc_ops->mpo_syscall != NULL) {
|
|
error = mpc->mpc_ops->mpo_syscall(td,
|
|
uap->call, uap->arg);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if ((entrycount = mac_policy_list_conditional_busy()) != 0) {
|
|
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) {
|
|
if (strcmp(mpc->mpc_name, target) == 0 &&
|
|
mpc->mpc_ops->mpo_syscall != NULL) {
|
|
error = mpc->mpc_ops->mpo_syscall(td,
|
|
uap->call, uap->arg);
|
|
break;
|
|
}
|
|
}
|
|
mac_policy_list_unbusy();
|
|
}
|
|
out:
|
|
return (error);
|
|
}
|
|
|
|
#else /* !MAC */
|
|
|
|
int
|
|
__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
int
|
|
__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
int
|
|
__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
int
|
|
__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
int
|
|
__mac_get_file(struct thread *td, struct __mac_get_file_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
int
|
|
__mac_get_link(struct thread *td, struct __mac_get_link_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
int
|
|
__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
int
|
|
__mac_set_file(struct thread *td, struct __mac_set_file_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
int
|
|
__mac_set_link(struct thread *td, struct __mac_set_link_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
int
|
|
mac_syscall(struct thread *td, struct mac_syscall_args *uap)
|
|
{
|
|
|
|
return (ENOSYS);
|
|
}
|
|
|
|
#endif /* !MAC */
|