281 lines
7.2 KiB
C
281 lines
7.2 KiB
C
/*
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*
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* Copyright (c) 2011-2023, Juniper Networks, Inc.
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* All rights reserved.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/errno.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/ioccom.h>
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#include <sys/jail.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/mdioctl.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/vnode.h>
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#include <security/mac_veriexec/mac_veriexec.h>
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#include <security/mac_veriexec/mac_veriexec_internal.h>
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#include "veriexec_ioctl.h"
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/*
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* We need a mutex while updating lists etc.
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*/
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extern struct mtx ve_mutex;
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/*
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* Handle the ioctl for the device
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*/
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static int
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verifiedexecioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
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int flags, struct thread *td)
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{
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struct nameidata nid;
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struct vattr vattr;
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struct verified_exec_label_params *lparams;
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struct verified_exec_params *params, params_;
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int error = 0;
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/*
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* These commands are considered safe requests for anyone who has
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* permission to access to device node.
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*/
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switch (cmd) {
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case VERIEXEC_GETSTATE:
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{
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int *ip = (int *)data;
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if (ip)
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*ip = mac_veriexec_get_state();
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else
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error = EINVAL;
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return (error);
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}
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break;
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default:
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break;
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}
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/*
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* Anything beyond this point is considered dangerous, so we need to
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* only allow processes that have kmem write privs to do them.
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*
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* MAC/veriexec will grant kmem write privs to "trusted" processes.
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*/
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error = priv_check(td, PRIV_VERIEXEC_CONTROL);
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if (error)
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return (error);
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lparams = (struct verified_exec_label_params *)data;
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switch (cmd) {
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case VERIEXEC_LABEL_LOAD:
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params = &lparams->params;
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break;
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case VERIEXEC_SIGNED_LOAD32:
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params = ¶ms_;
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memcpy(params, data, sizeof(struct verified_exec_params32));
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break;
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default:
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params = (struct verified_exec_params *)data;
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break;
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}
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switch (cmd) {
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case VERIEXEC_ACTIVE:
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mtx_lock(&ve_mutex);
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if (mac_veriexec_in_state(VERIEXEC_STATE_LOADED))
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mac_veriexec_set_state(VERIEXEC_STATE_ACTIVE);
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else
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error = EINVAL;
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mtx_unlock(&ve_mutex);
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break;
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case VERIEXEC_DEBUG_ON:
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mtx_lock(&ve_mutex);
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{
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int *ip = (int *)data;
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mac_veriexec_debug++;
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if (ip) {
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if (*ip > 0)
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mac_veriexec_debug = *ip;
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*ip = mac_veriexec_debug;
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}
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}
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mtx_unlock(&ve_mutex);
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break;
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case VERIEXEC_DEBUG_OFF:
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mac_veriexec_debug = 0;
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break;
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case VERIEXEC_ENFORCE:
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mtx_lock(&ve_mutex);
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if (mac_veriexec_in_state(VERIEXEC_STATE_LOADED))
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mac_veriexec_set_state(VERIEXEC_STATE_ACTIVE |
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VERIEXEC_STATE_ENFORCE);
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else
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error = EINVAL;
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mtx_unlock(&ve_mutex);
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break;
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case VERIEXEC_GETVERSION:
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{
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int *ip = (int *)data;
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if (ip)
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*ip = MAC_VERIEXEC_VERSION;
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else
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error = EINVAL;
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}
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break;
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case VERIEXEC_LOCK:
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mtx_lock(&ve_mutex);
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mac_veriexec_set_state(VERIEXEC_STATE_LOCKED);
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mtx_unlock(&ve_mutex);
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break;
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case VERIEXEC_LOAD:
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if (prison0.pr_securelevel > 0)
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return (EPERM); /* no updates when secure */
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/* FALLTHROUGH */
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case VERIEXEC_LABEL_LOAD:
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case VERIEXEC_SIGNED_LOAD:
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/*
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* If we use a loader that will only use a
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* digitally signed hash list - which it verifies.
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* We can load fingerprints provided veriexec is not locked.
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*/
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if (prison0.pr_securelevel > 0 &&
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!mac_veriexec_in_state(VERIEXEC_STATE_LOADED)) {
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/*
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* If securelevel has been raised and we
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* do not have any fingerprints loaded,
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* it would dangerous to do so now.
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*/
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return (EPERM);
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}
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if (mac_veriexec_in_state(VERIEXEC_STATE_LOCKED))
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error = EPERM;
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else {
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size_t labellen = 0;
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int flags = FREAD;
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int override = (cmd != VERIEXEC_LOAD);
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if (params->flags & VERIEXEC_LABEL) {
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labellen = strnlen(lparams->label,
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MAXLABELLEN) + 1;
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if (labellen > MAXLABELLEN)
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return (EINVAL);
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}
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/*
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* Get the attributes for the file name passed
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* stash the file's device id and inode number
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* along with it's fingerprint in a list for
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* exec to use later.
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*/
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/*
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* FreeBSD seems to copy the args to kernel space
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*/
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NDINIT(&nid, LOOKUP, FOLLOW, UIO_SYSSPACE, params->file);
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if ((error = vn_open(&nid, &flags, 0, NULL)) != 0)
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return (error);
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error = VOP_GETATTR(nid.ni_vp, &vattr, td->td_ucred);
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if (error != 0) {
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mac_veriexec_set_fingerprint_status(nid.ni_vp,
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FINGERPRINT_INVALID);
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VOP_UNLOCK(nid.ni_vp);
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(void) vn_close(nid.ni_vp, FREAD, td->td_ucred,
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td);
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return (error);
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}
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if (override) {
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/*
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* If the file is on a "verified" filesystem
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* someone may be playing games.
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*/
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if ((nid.ni_vp->v_mount->mnt_flag &
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MNT_VERIFIED) != 0)
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override = 0;
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}
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/*
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* invalidate the node fingerprint status
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* which will have been set in the vn_open
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* and would always be FINGERPRINT_NOTFOUND
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*/
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mac_veriexec_set_fingerprint_status(nid.ni_vp,
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FINGERPRINT_INVALID);
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VOP_UNLOCK(nid.ni_vp);
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(void) vn_close(nid.ni_vp, FREAD, td->td_ucred, td);
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mtx_lock(&ve_mutex);
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error = mac_veriexec_metadata_add_file(
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((params->flags & VERIEXEC_FILE) != 0),
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vattr.va_fsid, vattr.va_fileid, vattr.va_gen,
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params->fingerprint,
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(params->flags & VERIEXEC_LABEL) ?
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lparams->label : NULL, labellen,
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params->flags, params->fp_type, override);
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mac_veriexec_set_state(VERIEXEC_STATE_LOADED);
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mtx_unlock(&ve_mutex);
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}
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break;
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default:
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error = ENODEV;
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}
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return (error);
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}
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struct cdevsw veriexec_cdevsw = {
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.d_version = D_VERSION,
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.d_ioctl = verifiedexecioctl,
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.d_name = "veriexec",
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};
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static void
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veriexec_drvinit(void *unused __unused)
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{
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make_dev(&veriexec_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "veriexec");
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}
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SYSINIT(veriexec, SI_SUB_PSEUDO, SI_ORDER_ANY, veriexec_drvinit, NULL);
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MODULE_DEPEND(veriexec, mac_veriexec, MAC_VERIEXEC_VERSION,
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MAC_VERIEXEC_VERSION, MAC_VERIEXEC_VERSION);
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