/* $NetBSD: verified_exec.c,v 1.66 2009/06/29 05:08:17 dholland Exp $ */ /*- * Copyright (c) 2005, 2006 Elad Efrat * Copyright (c) 2005, 2006 Brett Lymn * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the authors may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: verified_exec.c,v 1.66 2009/06/29 05:08:17 dholland Exp $"); #include #include #include #include #include #include #include #include #include #include #ifdef __FreeBSD__ #include #include #include #else #include #include #define DEVPORT_DEVICE struct device #endif #include void veriexecattach(device_t, device_t, void *); static dev_type_open(veriexecopen); static dev_type_close(veriexecclose); static dev_type_ioctl(veriexecioctl); struct veriexec_softc { DEVPORT_DEVICE veriexec_dev; }; #if defined(__FreeBSD__) # define CDEV_MAJOR 216 # define BDEV_MAJOR -1 #endif const struct cdevsw veriexec_cdevsw = { veriexecopen, veriexecclose, noread, nowrite, veriexecioctl, #ifdef __NetBSD__ nostop, notty, #endif nopoll, nommap, #if defined(__NetBSD__) nokqfilter, D_OTHER, #elif defined(__FreeBSD__) nostrategy, "veriexec", CDEV_MAJOR, nodump, nopsize, 0, /* flags */ BDEV_MAJOR #endif }; /* count of number of times device is open (we really only allow one open) */ static unsigned int veriexec_dev_usage = 0; void veriexecattach(DEVPORT_DEVICE *parent, DEVPORT_DEVICE *self, void *aux) { veriexec_dev_usage = 0; } static int veriexecopen(dev_t dev, int flags, int fmt, struct lwp *l) { if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL)) return (EPERM); if (veriexec_dev_usage > 0) return(EBUSY); veriexec_dev_usage++; return (0); } static int veriexecclose(dev_t dev, int flags, int fmt, struct lwp *l) { if (veriexec_dev_usage > 0) veriexec_dev_usage--; return (0); } static int veriexec_delete(prop_dictionary_t dict, struct lwp *l) { struct vnode *vp; const char *file; int error; if (!prop_dictionary_get_cstring_nocopy(dict, "file", &file)) return (EINVAL); error = namei_simple_kernel(file, NSM_FOLLOW_NOEMULROOT, &vp); if (error) return (error); /* XXX this should be done differently... */ if (vp->v_type == VREG) error = veriexec_file_delete(l, vp); else if (vp->v_type == VDIR) error = veriexec_table_delete(l, vp->v_mount); vrele(vp); return (error); } static int veriexec_query(prop_dictionary_t dict, prop_dictionary_t rdict, struct lwp *l) { struct vnode *vp; const char *file; int error; if (!prop_dictionary_get_cstring_nocopy(dict, "file", &file)) return (EINVAL); error = namei_simple_kernel(file, NSM_FOLLOW_NOEMULROOT, &vp); if (error) return (error); error = veriexec_convert(vp, rdict); vrele(vp); return (error); } int veriexecioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l) { extern int veriexec_strict; struct plistref *plistref; prop_dictionary_t dict; int error = 0; /* XXX This should be replaced with a kauth(9) request. */ switch (cmd) { case VERIEXEC_TABLESIZE: case VERIEXEC_LOAD: case VERIEXEC_DELETE: case VERIEXEC_FLUSH: if (!(flags & FWRITE)) return (EPERM); if (veriexec_strict > VERIEXEC_LEARNING) { log(LOG_WARNING, "Veriexec: Strict mode, modifying " "tables not permitted.\n"); return (EPERM); } break; case VERIEXEC_QUERY: case VERIEXEC_DUMP: if (!(flags & FREAD)) return (EPERM); break; default: /* Invalid operation. */ return (ENODEV); } plistref = (struct plistref *)data; switch (cmd) { case VERIEXEC_TABLESIZE: /* Do nothing. Kept for binary compatibility. */ break; case VERIEXEC_LOAD: error = prop_dictionary_copyin_ioctl(plistref, cmd, &dict); if (error) break; error = veriexec_file_add(l, dict); prop_object_release(dict); break; case VERIEXEC_DELETE: error = prop_dictionary_copyin_ioctl(plistref, cmd, &dict); if (error) break; error = veriexec_delete(dict, l); prop_object_release(dict); break; case VERIEXEC_QUERY: { prop_dictionary_t rdict; error = prop_dictionary_copyin_ioctl(plistref, cmd, &dict); if (error) return (error); rdict = prop_dictionary_create(); if (rdict == NULL) { prop_object_release(dict); error = ENOMEM; break; } error = veriexec_query(dict, rdict, l); if (error == 0) { error = prop_dictionary_copyout_ioctl(plistref, cmd, rdict); } prop_object_release(rdict); prop_object_release(dict); break; } case VERIEXEC_DUMP: { prop_array_t rarray; rarray = prop_array_create(); if (rarray == NULL) { error = ENOMEM; break; } error = veriexec_dump(l, rarray); if (error == 0) { error = prop_array_copyout_ioctl(plistref, cmd, rarray); } prop_object_release(rarray); break; } case VERIEXEC_FLUSH: error = veriexec_flush(l); break; default: /* Invalid operation. */ error = ENODEV; break; } return (error); } #if defined(__FreeBSD__) static void veriexec_drvinit(void *unused) { make_dev(&verifiedexec_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "veriexec"); verifiedexecattach(0, 0, 0); } SYSINIT(veriexec, SI_SUB_PSEUDO, SI_ORDER_ANY, veriexec_drvinit, NULL); #endif