257 lines
7.7 KiB
C
257 lines
7.7 KiB
C
/* $NetBSD: verified_exec.c,v 1.4 2003/07/14 15:47:04 lukem Exp $ */
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/*-
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* Copyright (c) 1998-1999 Brett Lymn
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* (blymn@baea.com.au, brett_lymn@yahoo.com.au)
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* All rights reserved.
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*
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* This code has been donated to The NetBSD Foundation by the Author.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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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, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: verified_exec.c,v 1.4 2003/07/14 15:47:04 lukem Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/errno.h>
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#include <sys/verified_exec.h>
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#include <sys/buf.h>
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#include <sys/malloc.h>
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#include <sys/ioctl.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/lock.h>
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#include <sys/queue.h>
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#include <sys/vnode.h>
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#include <sys/fcntl.h>
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#include <sys/namei.h>
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struct verified_exec_softc {
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struct device veriexec_dev;
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};
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const struct cdevsw verifiedexec_cdevsw = {
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verifiedexecopen, verifiedexecclose, noread, nowrite,
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verifiedexecioctl, nostop, notty, nopoll, nommap, nokqfilter,
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};
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/* internal structures */
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LIST_HEAD(veriexec_devhead, veriexec_dev_list) veriexec_dev_head;
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/*LIST_HEAD(veriexec_file_devhead, veriexec_dev_list) veriexec_file_dev_head;*/
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struct veriexec_devhead veriexec_file_dev_head;
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/* Autoconfiguration glue */
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void verifiedexecattach(struct device *parent, struct device *self,
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void *aux);
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int verifiedexecopen(dev_t dev, int flags, int fmt, struct proc *p);
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int verifiedexecclose(dev_t dev, int flags, int fmt, struct proc *p);
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int verifiedexecioctl(dev_t dev, u_long cmd, caddr_t data, int flags,
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struct proc *p);
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void add_veriexec_inode(struct veriexec_dev_list *list, unsigned long inode,
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unsigned char fingerprint[MAXFINGERPRINTLEN],
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unsigned char type, unsigned char fp_type);
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struct veriexec_dev_list *find_veriexec_dev(unsigned long dev,
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struct veriexec_devhead *head);
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/*
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* Attach for autoconfig to find. Initialise the lists and return...
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*/
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void
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verifiedexecattach(struct device *parent, struct device *self, void *aux)
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{
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LIST_INIT(&veriexec_dev_head);
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LIST_INIT(&veriexec_file_dev_head);
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}
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int
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verifiedexecopen(dev_t dev, int flags, int fmt, struct proc *p)
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{
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return 0;
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}
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int
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verifiedexecclose(dev_t dev, int flags, int fmt, struct proc *p)
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{
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#ifdef VERIFIED_EXEC_DEBUG_VERBOSE
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struct veriexec_dev_list *lp;
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struct veriexec_inode_list *ip;
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printf("Loaded exec fingerprint list is:\n");
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for (lp = LIST_FIRST(&veriexec_dev_head); lp != NULL;
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lp = LIST_NEXT(lp, entries)) {
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for (ip = LIST_FIRST(&(lp->inode_head)); ip != NULL;
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ip = LIST_NEXT(ip, entries)) {
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printf("Got loaded fingerprint for dev %lu, inode %lu\n",
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lp->id, ip->inode);
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}
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}
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printf("\n\nLoaded file fingerprint list is:\n");
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for (lp = LIST_FIRST(&veriexec_file_dev_head); lp != NULL;
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lp = LIST_NEXT(lp, entries)) {
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for (ip = LIST_FIRST(&(lp->inode_head)); ip != NULL;
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ip = LIST_NEXT(ip, entries)) {
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printf("Got loaded fingerprint for dev %lu, inode %lu\n",
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lp->id, ip->inode);
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}
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}
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#endif
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return 0;
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}
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/*
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* Search the list of devices looking for the one given. If it is not
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* in the list then add it.
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*/
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struct veriexec_dev_list *
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find_veriexec_dev(unsigned long dev, struct veriexec_devhead *head)
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{
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struct veriexec_dev_list *lp;
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for (lp = LIST_FIRST(head); lp != NULL;
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lp = LIST_NEXT(lp, entries))
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if (lp->id == dev) break;
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if (lp == NULL) {
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/* if pointer is null then entry not there, add a new one */
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MALLOC(lp, struct veriexec_dev_list *,
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sizeof(struct veriexec_dev_list), M_TEMP, M_WAITOK);
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LIST_INIT(&(lp->inode_head));
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lp->id = dev;
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LIST_INSERT_HEAD(head, lp, entries);
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}
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return lp;
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}
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/*
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* Add a file's inode and fingerprint to the list of inodes attached
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* to the device id. Only add the entry if it is not already on the
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* list.
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*/
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void
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add_veriexec_inode(struct veriexec_dev_list *list, unsigned long inode,
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unsigned char fingerprint[MAXFINGERPRINTLEN],
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unsigned char type, unsigned char fp_type)
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{
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struct veriexec_inode_list *ip;
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for (ip = LIST_FIRST(&(list->inode_head)); ip != NULL;
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ip = LIST_NEXT(ip, entries))
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/* check for a dupe inode in the list, skip if an entry
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* exists for this inode except for when the type is
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* VERIEXEC_INDIRECT, always set the type when it is so
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* we don't get a hole caused by conflicting types on
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* hardlinked files. XXX maybe we should validate
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* fingerprint is same and complain if it is not...
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*/
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if (ip->inode == inode) {
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if (type == VERIEXEC_INDIRECT)
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ip->type = type;
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return;
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}
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MALLOC(ip, struct veriexec_inode_list *, sizeof(struct veriexec_inode_list),
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M_TEMP, M_WAITOK);
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ip->type = type;
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ip->fp_type = fp_type;
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ip->inode = inode;
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memcpy(ip->fingerprint, fingerprint, sizeof(ip->fingerprint));
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LIST_INSERT_HEAD(&(list->inode_head), ip, entries);
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}
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/*
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* Handle the ioctl for the device
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*/
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int
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verifiedexecioctl(dev_t dev, u_long cmd, caddr_t data, int flags,
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struct proc *p)
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{
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int error = 0;
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struct verified_exec_params *params = (struct verified_exec_params *)data;
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struct nameidata nid;
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struct vattr vattr;
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struct veriexec_dev_list *dlp;
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#ifdef VERIFIED_EXEC_DEBUG
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printf("veriexec_ioctl: got cmd 0x%lx for file %s\n", cmd, params->file);
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#endif
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switch (cmd) {
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case VERIEXECLOAD:
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if (securelevel > 0) {
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/* don't allow updates when secure */
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error = EPERM;
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} else {
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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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NDINIT(&nid, LOOKUP, FOLLOW, UIO_USERSPACE,
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params->file, p);
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if ((error = vn_open(&nid, FREAD, 0)) != 0) {
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return(error);
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}
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error = VOP_GETATTR(nid.ni_vp, &vattr, p->p_ucred, p);
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if (error) {
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nid.ni_vp->fp_status = FINGERPRINT_INVALID;
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VOP_UNLOCK(nid.ni_vp, 0);
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(void) vn_close(nid.ni_vp, FREAD,
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p->p_ucred, p);
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return(error);
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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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nid.ni_vp->fp_status = FINGERPRINT_INVALID;
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VOP_UNLOCK(nid.ni_vp, 0);
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(void) vn_close(nid.ni_vp, FREAD, p->p_ucred, p);
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/* vattr.va_fsid = dev, vattr.va_fileid = inode */
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if (params->type == VERIEXEC_FILE) {
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dlp = find_veriexec_dev(vattr.va_fsid,
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&veriexec_file_dev_head);
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} else {
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dlp = find_veriexec_dev(vattr.va_fsid,
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&veriexec_dev_head);
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}
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add_veriexec_inode(dlp, vattr.va_fileid,
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params->fingerprint, params->type,
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params->fp_type);
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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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