Index: head/sys/security/mac_veriexec/veriexec_fingerprint.c =================================================================== --- head/sys/security/mac_veriexec/veriexec_fingerprint.c (revision 335429) +++ head/sys/security/mac_veriexec/veriexec_fingerprint.c (revision 335430) @@ -1,443 +1,445 @@ /* * $FreeBSD$ * * Copyright (c) 2011, 2012, 2013, 2015, 2016, Juniper Networks, Inc. * All rights reserved. * * Originally derived from: * $NetBSD: kern_verifiedexec.c,v 1.7 2003/11/18 13:13:03 martin Exp $ * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 #include "opt_mac.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mac_veriexec.h" #include "mac_veriexec_internal.h" /** * @var fpops_list * @internal * @brief Fingerprint operations list * * This is essentially the list of fingerprint modules currently loaded */ static LIST_HEAD(fpopshead, mac_veriexec_fpops) fpops_list; static int mac_veriexec_late; static int sysctl_mac_veriexec_algorithms(SYSCTL_HANDLER_ARGS); SYSCTL_PROC(_security_mac_veriexec, OID_AUTO, algorithms, CTLTYPE_STRING | CTLFLAG_RD, 0, 0, sysctl_mac_veriexec_algorithms, "A", "Verified execution supported hashing algorithms"); static int sysctl_mac_veriexec_algorithms(SYSCTL_HANDLER_ARGS) { struct sbuf sb; struct mac_veriexec_fpops *fpops; int algorithms, error; algorithms = 0; sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND); LIST_FOREACH(fpops, &fpops_list, entries) { if (algorithms++) sbuf_printf(&sb, " "); sbuf_printf(&sb, "%s", fpops->type); } sbuf_finish(&sb); error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb)); sbuf_delete(&sb); return (error); } /** * @internal * @brief Consistently identify file encountering errors * * @param imgp image params to display * @param td calling thread * @param msg message to display * * @return String form of the information stored in @p imgp */ static void identify_error (struct image_params *imgp, struct thread *td, const char *msg) { struct proc *parent; pid_t ppid, gppid; parent = imgp->proc->p_pptr; ppid = (parent != NULL) ? parent->p_pid : 0; gppid = (parent != NULL && parent->p_pptr != NULL) ? parent->p_pptr->p_pid : 0; - log(LOG_ERR, MAC_VERIEXEC_FULLNAME ": %s (file=%s fsid=%lu fileid=%lu " + log(LOG_ERR, MAC_VERIEXEC_FULLNAME ": %s (file=%s fsid=%ju fileid=%ju " "gen=%lu uid=%u pid=%u ppid=%u gppid=%u)", msg, (imgp->args != NULL) ? imgp->args->fname : "", - imgp->attr->va_fsid, imgp->attr->va_fileid, imgp->attr->va_gen, - td->td_ucred->cr_ruid, imgp->proc->p_pid, ppid, gppid); + (uintmax_t)imgp->attr->va_fsid, (uintmax_t)imgp->attr->va_fileid, + imgp->attr->va_gen, td->td_ucred->cr_ruid, imgp->proc->p_pid, + ppid, gppid); } /** * @internal * @brief Check the fingerprint type for the given file and evaluate the * fingerprint for that file. * * It is assumed that @p fingerprint has sufficient storage to hold the * resulting fingerprint string. * * @param vp vnode to check * @param ip file info from the meta-data store * @param td calling thread * @param file_size size of the file to read * @param fingerprint resulting fingerprint * * @return 0 on success, otherwise an error code. */ static int evaluate_fingerprint(struct vnode *vp, struct mac_veriexec_file_info *ip, struct thread *td, off_t file_size, unsigned char *fingerprint) { uint8_t *filebuf; void *ctx; off_t offset; size_t count, nread, resid; int error = EINVAL; filebuf = malloc(PAGE_SIZE, M_VERIEXEC, M_WAITOK); ctx = malloc(ip->ops->context_size, M_VERIEXEC, M_WAITOK); (ip->ops->init)(ctx); for (offset = 0; offset < file_size; offset += nread) { if ((offset + PAGE_SIZE) > file_size) count = file_size - offset; else count = PAGE_SIZE; error = vn_rdwr_inchunks(UIO_READ, vp, filebuf, count, offset, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED, &resid, td); if (error) goto failed; nread = count - resid; (ip->ops->update)(ctx, filebuf, nread); } (ip->ops->final)(fingerprint, ctx); #ifdef DEBUG_VERIEXEC_FINGERPRINT for (offset = 0; offset < ip->ops->digest_len; offset++) printf("%02x", fingerprint[offset]); printf("\n"); #endif failed: free(ctx, M_VERIEXEC); free(filebuf, M_VERIEXEC); return (error); } /** * @internal * @brief Compare the two given fingerprints to see if they are the same. * * Differing fingerprint methods may have differing lengths which * is handled by this routine. * * @param ip file info from the meta-data store * @param digest digest to compare * * @return 0 if the fingerprints match and non-zero if they do not. */ static int fingerprintcmp(struct mac_veriexec_file_info *ip, unsigned char *digest) { return memcmp(ip->fingerprint, digest, ip->ops->digest_len); } /** * @brief Check if @p fingerprint matches the one associated with the vnode * @p vp * * @param vp vnode to check * @param ip file info from the meta-data store * @param td calling thread * @param file_size size of the file to read * @param fingerprint fingerprint to compare * * @return 0 if they match, otherwise an error code. */ int mac_veriexec_fingerprint_check_vnode(struct vnode *vp, struct mac_veriexec_file_info *ip, struct thread *td, off_t file_size, unsigned char *fingerprint) { int error; /* reject fingerprint if writers are active */ if (vp->v_writecount) return (ETXTBSY); if ((vp->v_mount->mnt_flag & MNT_VERIFIED) != 0) { - VERIEXEC_DEBUG(2, ("file %lu.%lu on verified %s mount\n", - ip->fileid, ip->gen, vp->v_mount->mnt_vfc->vfc_name)); + VERIEXEC_DEBUG(2, ("file %ju.%lu on verified %s mount\n", + (uintmax_t)ip->fileid, ip->gen, + vp->v_mount->mnt_vfc->vfc_name)); /* * The VFS is backed by a file which has been verified. * No need to waste time here. */ return (0); } error = evaluate_fingerprint(vp, ip, td, file_size, fingerprint); if (error) return (error); if (fingerprintcmp(ip, fingerprint) != 0) return (EAUTH); return (0); } /** * @brief Check a file signature and validate it. * * @param imgp parameters for the image to check * @param check_files if 1, check the files list first, otherwise check the * exectuables list first * @param td calling thread * * @note Called with imgp->vp locked. * * @return 0 if the signature is valid, otherwise an error code. */ int mac_veriexec_fingerprint_check_image(struct image_params *imgp, int check_files, struct thread *td) { struct vnode *vp = imgp->vp; int error; fingerprint_status_t status; if (!mac_veriexec_in_state(VERIEXEC_STATE_ACTIVE)) return 0; error = mac_veriexec_metadata_fetch_fingerprint_status(vp, imgp->attr, td, check_files); if (error && error != EAUTH) return (error); /* * By now status is set. */ status = mac_veriexec_get_fingerprint_status(vp); switch (status) { case FINGERPRINT_INVALID: /* should not happen */ identify_error(imgp, td, "got unexpected FINGERPRINT_INVALID"); error = EPERM; break; case FINGERPRINT_FILE: if (!check_files) { if (prison0.pr_securelevel > 1 || mac_veriexec_in_state(VERIEXEC_STATE_ENFORCE)) error = EPERM; } break; case FINGERPRINT_VALID: /* is ok - report so if debug is on */ VERIEXEC_DEBUG(4, ("Fingerprint matches\n")); break; case FINGERPRINT_INDIRECT: /* fingerprint ok but need to check for direct execution */ if (!imgp->interpreted) { identify_error(imgp, td, "attempted direct execution"); if (prison0.pr_securelevel > 1 || mac_veriexec_in_state(VERIEXEC_STATE_ENFORCE)) error = EPERM; } break; case FINGERPRINT_NOMATCH: /* does not match - whine about it */ identify_error(imgp, td, "fingerprint does not match loaded value"); if (prison0.pr_securelevel > 1 || mac_veriexec_in_state(VERIEXEC_STATE_ENFORCE)) error = EAUTH; break; case FINGERPRINT_NOENTRY: /* no entry in the list, complain */ identify_error(imgp, td, "no fingerprint"); if (prison0.pr_securelevel > 1 || mac_veriexec_in_state(VERIEXEC_STATE_ENFORCE)) error = EAUTH; break; case FINGERPRINT_NODEV: /* no signatures for the device, complain */ identify_error(imgp, td, "no signatures for device"); if (prison0.pr_securelevel > 1 || mac_veriexec_in_state(VERIEXEC_STATE_ENFORCE)) error = EAUTH; break; default: /* this should never happen. */ identify_error(imgp, td, "invalid status field for vnode"); error = EPERM; } return error; } /** * @brief Look up the fingerprint operations for a specific digest type * * @return A pointer to fingerprint operations, if found, or else @c NULL. */ struct mac_veriexec_fpops * mac_veriexec_fingerprint_lookup_ops(const char *type) { struct mac_veriexec_fpops *fpops; if (type == NULL) return (NULL); LIST_FOREACH(fpops, &fpops_list, entries) { if (!strcasecmp(type, fpops->type)) break; } return (fpops); } /** * @brief Add fingerprint operations for a specific digest type * * Any attempts to add a duplicate digest type results in an error. * * @return 0 if the ops were added successfully, otherwise an error code. */ int mac_veriexec_fingerprint_add_ops(struct mac_veriexec_fpops *fpops) { /* Sanity check the ops */ if (fpops->type == NULL || fpops->digest_len == 0 || fpops->context_size == 0 || fpops->init == NULL || fpops->update == NULL || fpops->final == NULL) return (EINVAL); /* Make sure we do not already have ops for this digest type */ if (mac_veriexec_fingerprint_lookup_ops(fpops->type)) return (EEXIST); /* Add the ops to the list */ LIST_INSERT_HEAD(&fpops_list, fpops, entries); printf("MAC/veriexec fingerprint module loaded: %s\n", fpops->type); return (0); } /** * @brief Initialize the fingerprint operations list */ void mac_veriexec_fingerprint_init(void) { LIST_INIT(&fpops_list); } /** * @brief Handle fingerprint module events * * This function is called by the @c MAC_VERIEXEC_FPMOD macro. * * @param mod module information * @param type event type * @param data event-specific data * * @return On @c MOD_LOAD, 0 if the fingerprint ops were added successfully, * otherwise an error code. All other event types result in an error code. */ int mac_veriexec_fingerprint_modevent(module_t mod, int type, void *data) { struct mac_veriexec_fpops *fpops; int error; error = 0; fpops = (struct mac_veriexec_fpops *) data; switch (type) { case MOD_LOAD: /* We do not allow late loading of fingerprint modules */ if (mac_veriexec_late) { printf("%s: can't load %s fingerprint module after " "booting\n", __func__, fpops->type); error = EBUSY; break; } error = mac_veriexec_fingerprint_add_ops(fpops); break; case MOD_UNLOAD: error = EBUSY; break; default: error = EOPNOTSUPP; break; } return (error); } /** * @internal * @brief Mark veriexec late initialization flag */ static void mac_veriexec_late_init(void) { mac_veriexec_late = 1; } SYSINIT(mac_veriexec_late, SI_SUB_MAC_LATE, SI_ORDER_ANY, mac_veriexec_late_init, NULL); Index: head/sys/security/mac_veriexec/veriexec_metadata.c =================================================================== --- head/sys/security/mac_veriexec/veriexec_metadata.c (revision 335429) +++ head/sys/security/mac_veriexec/veriexec_metadata.c (revision 335430) @@ -1,727 +1,730 @@ /* * $FreeBSD$ * * Copyright (c) 2011, 2012, 2013, 2015, 2016, Juniper Networks, Inc. * All rights reserved. * * Originally derived from: * $NetBSD: kern_verifiedexec.c,v 1.7 2003/11/18 13:13:03 martin Exp $ * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 #include "opt_mac.h" #include #include #include #include #include #include #include #include #include #include "mac_veriexec.h" #include "mac_veriexec_internal.h" /** * @brief per-device meta-data storage */ struct veriexec_dev_list { dev_t fsid; /**< file system identifier of the mount point */ LIST_HEAD(filehead, mac_veriexec_file_info) file_head; /**< list of per-file meta-data information */ LIST_ENTRY(veriexec_dev_list) entries; /**< next entries in the device list */ }; typedef LIST_HEAD(veriexec_devhead, veriexec_dev_list) veriexec_devhead_t; /** * @brief Mutex to protect the meta-data store lists */ struct mtx ve_mutex; /** * @brief Executables meta-data storage * * This is used to store the fingerprints for potentially-executable files. */ veriexec_devhead_t veriexec_dev_head; /** * @brief Plain file meta-data storage * * This is used for files that are not allowed to be executed, but should * have fingerprint validation available. */ veriexec_devhead_t veriexec_file_dev_head; /** * @internal * @brief Search the @p head meta-data list for the specified file identifier * @p fileid in the file system identified by @p fsid * * If meta-data exists for file system identified by @p fsid, it has a * fingerprint list, and @p found_dev is not @c NULL then store true in the * location pointed to by @p found_dev * * @param head meta-data list to search * @param fsid file system identifier to look for * @param fileid file to look for * @param gen generation of file * @param found_dev indicator that an entry for the file system was found * * @return A pointer to the meta-data inforation if meta-data exists for * the specified file identifier, otherwise @c NULL */ static struct mac_veriexec_file_info * get_veriexec_file(struct veriexec_devhead *head, dev_t fsid, long fileid, unsigned long gen, int *found_dev) { struct veriexec_dev_list *lp; struct mac_veriexec_file_info *ip, *tip; ip = NULL; /* Initialize the value found_dev, if non-NULL */ if (found_dev != NULL) *found_dev = 0; - VERIEXEC_DEBUG(3, ("searching for file %lu.%lu on device %lu," - " files=%d\n", fileid, gen, (unsigned long)fsid, + VERIEXEC_DEBUG(3, ("searching for file %ju.%lu on device %ju," + " files=%d\n", (uintmax_t)fileid, gen, (uintmax_t)fsid, (head == &veriexec_file_dev_head))); /* Get a lock to access the list */ mtx_lock(&ve_mutex); /* First, look for the file system */ for (lp = LIST_FIRST(head); lp != NULL; lp = LIST_NEXT(lp, entries)) if (lp->fsid == fsid) break; /* We found the file system in the list */ if (lp != NULL) { - VERIEXEC_DEBUG(3, ("found matching dev number %lu\n", - lp->fsid)); + VERIEXEC_DEBUG(3, ("found matching dev number %ju\n", + (uintmax_t)lp->fsid)); /* If found_dev is non-NULL, store true there */ if (found_dev != NULL) *found_dev = 1; /* Next, look for the meta-data information for the file */ LIST_FOREACH_SAFE(ip, &(lp->file_head), entries, tip) { if (ip->fileid == fileid) { if (ip->gen == gen) break; /* we need to garbage collect */ LIST_REMOVE(ip, entries); free(ip, M_VERIEXEC); } } } /* Release the lock we obtained earlier */ mtx_unlock(&ve_mutex); /* Return the meta-data information we found, if anything */ return (ip); } /** * @internal * @brief Search the meta-data store for information on the specified file. * * @param fsid file system identifier to look for * @param fileid file to look for * @param gen generation of file * @param found_dev indicator that an entry for the file system was found * @param check_files if 1, check the files list first, otherwise check the * exectuables list first * * @return A pointer to the meta-data inforation if meta-data exists for * the specified file identifier, otherwise @c NULL */ static struct mac_veriexec_file_info * find_veriexec_file(dev_t fsid, long fileid, unsigned long gen, int *found_dev, int check_files) { struct veriexec_devhead *search[3]; struct mac_veriexec_file_info *ip; int x; /* Determine the order of the lists to search */ if (check_files) { search[0] = &veriexec_file_dev_head; search[1] = &veriexec_dev_head; } else { search[0] = &veriexec_dev_head; search[1] = &veriexec_file_dev_head; } search[2] = NULL; - VERIEXEC_DEBUG(3, ("%s: searching for dev %lu, file %lu\n", - __func__, fsid, fileid)); + VERIEXEC_DEBUG(3, ("%s: searching for dev %ju, file %lu\n", + __func__, (uintmax_t)fsid, fileid)); /* Search for the specified file */ for (ip = NULL, x = 0; ip == NULL && search[x]; x++) ip = get_veriexec_file(search[x], fsid, fileid, gen, found_dev); return (ip); } /** * @internal * @brief Display the fingerprint for each entry in the device list * * @param sbp sbuf to write output to * @param lp pointer to device list */ static void mac_veriexec_print_db_dev_list(struct sbuf *sbp, struct veriexec_dev_list *lp) { struct mac_veriexec_file_info *ip; #define FPB(i) (ip->fingerprint[i]) for (ip = LIST_FIRST(&(lp->file_head)); ip != NULL; ip = LIST_NEXT(ip, entries)) sbuf_printf(sbp, " %ld: %u %ld [%02x %02x %02x %02x %02x " "%02x %02x %02x...]\n", ip->fileid, ip->flags, ip->gen, FPB(0), FPB(1), FPB(2), FPB(3), FPB(4), FPB(5), FPB(6), FPB(7)); } /** * @internal * @brief Display the device list * * @param sbp sbuf to write output to * @param head pointer to head of the device list */ static void mac_veriexec_print_db_head(struct sbuf *sbp, struct veriexec_devhead *head) { struct veriexec_dev_list *lp; for (lp = LIST_FIRST(head); lp != NULL; lp = LIST_NEXT(lp, entries)) { - sbuf_printf(sbp, " FS id: %lu\n", lp->fsid); + sbuf_printf(sbp, " FS id: %ju\n", (uintmax_t)lp->fsid); mac_veriexec_print_db_dev_list(sbp, lp); } } /** * @internal * @brief Generate human-readable output for the current fingerprint database * * @param sbp sbuf to write output to */ void mac_veriexec_metadata_print_db(struct sbuf *sbp) { struct { struct veriexec_devhead *h; const char *name; } fpdbs[] = { { &veriexec_file_dev_head, "regular files" }, { &veriexec_dev_head, "executable files" }, }; int i; mtx_lock(&ve_mutex); for (i = 0; i < sizeof(fpdbs)/sizeof(fpdbs[0]); i++) { sbuf_printf(sbp, "%s fingerprint db:\n", fpdbs[i].name); mac_veriexec_print_db_head(sbp, fpdbs[i].h); } mtx_unlock(&ve_mutex); } /** * @brief Determine if the meta-data store has an entry for the specified file. * * @param fsid file system identifier to look for * @param fileid file to look for * @param gen generation of file * * @return 1 if there is an entry in the meta-data store, 0 otherwise. */ int mac_veriexec_metadata_has_file(dev_t fsid, long fileid, unsigned long gen) { return (find_veriexec_file(fsid, fileid, gen, NULL, VERIEXEC_FILES_FIRST) != NULL); } /** * @brief Search the list of devices looking for the one given, in order to * release the resources used by it. * * If found, free all file entries for it, and remove it from the list. * * @note Called with @a ve_mutex held * * @param fsid file system identifier to look for * @param head meta-data list to search * * @return 0 if the device entry was freed, otherwise an error code */ static int free_veriexec_dev(dev_t fsid, struct veriexec_devhead *head) { struct veriexec_dev_list *lp; struct mac_veriexec_file_info *ip, *nip; /* Look for the file system */ for (lp = LIST_FIRST(head); lp != NULL; lp = LIST_NEXT(lp, entries)) if (lp->fsid == fsid) break; /* If lp is NULL, we did not find it */ if (lp == NULL) return ENOENT; /* Unhook lp, before we free it and its content */ LIST_REMOVE(lp, entries); /* Release the lock */ mtx_unlock(&ve_mutex); /* Free the file entries in the list */ for (ip = LIST_FIRST(&(lp->file_head)); ip != NULL; ip = nip) { nip = LIST_NEXT(ip, entries); LIST_REMOVE(ip, entries); free(ip, M_VERIEXEC); } /* Free the meta-data entry for the device */ free(lp, M_VERIEXEC); /* Re-acquire the lock */ mtx_lock(&ve_mutex); return 0; } /** * @brief Search the list of devices looking for the one given. * * If it is not in the list then add it. * * @note Called with @a ve_mutex held * * @param fsid file system identifier to look for * @param head meta-data list to search * * @return A pointer to the meta-data entry for the device, if found or added, * otherwise @c NULL */ static struct veriexec_dev_list * find_veriexec_dev(dev_t fsid, struct veriexec_devhead *head) { struct veriexec_dev_list *lp; struct veriexec_dev_list *np = NULL; search: /* Look for the file system */ for (lp = LIST_FIRST(head); lp != NULL; lp = LIST_NEXT(lp, entries)) if (lp->fsid == fsid) break; if (lp == NULL) { if (np == NULL) { /* * If pointer is null then entry not there, * add a new one, first try to malloc while * we hold mutex - should work most of the time. */ np = malloc(sizeof(struct veriexec_dev_list), M_VERIEXEC, M_NOWAIT); if (np == NULL) { /* * So much for that plan, dop the mutex * and repeat... */ mtx_unlock(&ve_mutex); np = malloc(sizeof(struct veriexec_dev_list), M_VERIEXEC, M_WAITOK); mtx_lock(&ve_mutex); /* * Repeat the seach, in case someone * added this while we slept. */ goto search; } } if (np) { /* Add the entry to the list */ lp = np; LIST_INIT(&(lp->file_head)); lp->fsid = fsid; LIST_INSERT_HEAD(head, lp, entries); } } else if (np) { /* * Someone else did it while we slept. */ mtx_unlock(&ve_mutex); free(np, M_VERIEXEC); mtx_lock(&ve_mutex); } return (lp); } /** * @brief When a device is unmounted, we want to toss the signatures recorded * against it. * * We are being called from unmount() with the root vnode just before it is * freed. * * @param fsid file system identifier to look for * @param td calling thread * * @return 0 on success, otherwise an error code. */ int mac_veriexec_metadata_unmounted(dev_t fsid, struct thread *td) { int error; /* * The device can have entries on both lists. */ mtx_lock(&ve_mutex); error = free_veriexec_dev(fsid, &veriexec_dev_head); if (error && error != ENOENT) { mtx_unlock(&ve_mutex); return error; } error = free_veriexec_dev(fsid, &veriexec_file_dev_head); mtx_unlock(&ve_mutex); if (error && error != ENOENT) { return error; } return 0; } /** * @brief Return the flags assigned to the file identified by file system * identifier @p fsid and file identifier @p fileid. * * @param fsid file system identifier * @param fileid file identifier within the file system * @param gen generation of file * @param flags pointer to location to store the flags * @param check_files if 1, check the files list first, otherwise check the * exectuables list first * * @return 0 on success, otherwise an error code. */ int mac_veriexec_metadata_get_file_flags(dev_t fsid, long fileid, unsigned long gen, int *flags, int check_files) { struct mac_veriexec_file_info *ip; int found_dev; ip = find_veriexec_file(fsid, fileid, gen, &found_dev, check_files); if (ip == NULL) return (ENOENT); *flags = ip->flags; return (0); } /** * @brief get the files for the specified process * * @param cred credentials to use * @param p process to get the flags for * @param flags where to store the flags * @param check_files if 1, check the files list first, otherwise check the * exectuables list first * * @return 0 if the process has an entry in the meta-data store, otherwise an * error code */ int mac_veriexec_metadata_get_executable_flags(struct ucred *cred, struct proc *p, int *flags, int check_files) { struct vnode *proc_vn; struct vattr vap; int error; /* Get the text vnode for the process */ proc_vn = p->p_textvp; if (proc_vn == NULL) return EINVAL; /* Get vnode attributes */ error = VOP_GETATTR(proc_vn, &vap, cred); if (error) return error; error = mac_veriexec_metadata_get_file_flags(vap.va_fsid, vap.va_fileid, vap.va_gen, flags, (check_files == VERIEXEC_FILES_FIRST)); return (error); } /** * @brief Ensure the fingerprint status for the vnode @p vp is assigned to its * MAC label. * * @param vp vnode to check * @param vap vnode attributes to use * @param td calling thread * @param check_files if 1, check the files list first, otherwise check the * exectuables list first * * @return 0 on success, otherwise an error code. */ int mac_veriexec_metadata_fetch_fingerprint_status(struct vnode *vp, struct vattr *vap, struct thread *td, int check_files) { unsigned char digest[MAXFINGERPRINTLEN]; struct mac_veriexec_file_info *ip; int error, found_dev; fingerprint_status_t status; error = 0; ip = NULL; status = mac_veriexec_get_fingerprint_status(vp); if (status == FINGERPRINT_INVALID || status == FINGERPRINT_NODEV) { found_dev = 0; ip = find_veriexec_file(vap->va_fsid, vap->va_fileid, vap->va_gen, &found_dev, check_files); if (ip == NULL) { status = (found_dev) ? FINGERPRINT_NOENTRY : FINGERPRINT_NODEV; VERIEXEC_DEBUG(3, - ("fingerprint status is %d for dev %lu, file " - "%lu.%lu\n", status, vap->va_fsid, vap->va_fileid, - vap->va_gen)); + ("fingerprint status is %d for dev %ju, file " + "%ju.%lu\n", status, (uintmax_t)vap->va_fsid, + (uintmax_t)vap->va_fileid, vap->va_gen)); } else { /* * evaluate and compare fingerprint */ error = mac_veriexec_fingerprint_check_vnode(vp, ip, td, vap->va_size, digest); switch (error) { case 0: /* Process flags */ if ((ip->flags & VERIEXEC_INDIRECT)) status = FINGERPRINT_INDIRECT; else if ((ip->flags & VERIEXEC_FILE)) status = FINGERPRINT_FILE; else status = FINGERPRINT_VALID; VERIEXEC_DEBUG(2, - ("%sfingerprint matches for dev %lu, file " - "%lu.%lu\n", + ("%sfingerprint matches for dev %ju, file " + "%ju.%lu\n", (status == FINGERPRINT_INDIRECT) ? "indirect " : (status == FINGERPRINT_FILE) ? - "file " : "", vap->va_fsid, - vap->va_fileid, vap->va_gen)); + "file " : "", (uintmax_t)vap->va_fsid, + (uintmax_t)vap->va_fileid, vap->va_gen)); break; case EAUTH: #ifdef VERIFIED_EXEC_DEBUG_VERBOSE { char have[MAXFINGERPRINTLEN * 2 + 1]; char want[MAXFINGERPRINTLEN * 2 + 1]; int i, len; len = ip->ops->digest_len; for (i = 0; i < len; i++) { sprintf(&want[i * 2], "%02x", ip->fingerprint[i]); sprintf(&have[i * 2], "%02x", digest[i]); } log(LOG_ERR, MAC_VERIEXEC_FULLNAME - ": fingerprint for dev %lu, file " - "%lu.%lu %s != %s\n", vap->va_fsid, - vap->va_fileid, vap->va_gen, + ": fingerprint for dev %ju, file " + "%ju.%lu %s != %s\n", + (uintmax_t)vap->va_fsid, + (uintmax_t)vap->va_fileid, + vap->va_gen, have, want); } #endif status = FINGERPRINT_NOMATCH; break; default: VERIEXEC_DEBUG(2, ("fingerprint status error %d\n", error)); break; } } mac_veriexec_set_fingerprint_status(vp, status); } return (error); } /** * Add a file and its fingerprint to the list of files attached * to the device @p fsid. * * Only add the entry if it is not already on the list. * * @note Called with @a ve_mutex held * * @param file_dev if 1, the entry should be added on the file list, * otherwise it should be added on the executable list * @param fsid file system identifier of device * @param fileid file to add * @param gen generation of file * @param fingerprint fingerprint to add to the store * @param flags flags to set in the store * @param fp_type digest type * @param override if 1, override any values already stored * * @return 0 on success, otherwise an error code. */ int mac_veriexec_metadata_add_file(int file_dev, dev_t fsid, long fileid, unsigned long gen, unsigned char fingerprint[MAXFINGERPRINTLEN], int flags, const char *fp_type, int override) { struct mac_veriexec_fpops *fpops; struct veriexec_dev_list *lp; struct veriexec_devhead *head; struct mac_veriexec_file_info *ip; struct mac_veriexec_file_info *np = NULL; /* Look up the device entry */ if (file_dev) head = &veriexec_file_dev_head; else head = &veriexec_dev_head; lp = find_veriexec_dev(fsid, head); /* Look up the fingerprint operations for the digest type */ fpops = mac_veriexec_fingerprint_lookup_ops(fp_type); if (fpops == NULL) return (EOPNOTSUPP); search: for (ip = LIST_FIRST(&(lp->file_head)); ip != NULL; ip = LIST_NEXT(ip, entries)) { /* check for a dupe file in the list, skip if an entry * exists for this file except for when the flags contains * VERIEXEC_INDIRECT, always set the flags when it is so * we don't get a hole caused by conflicting flags on * hardlinked files. XXX maybe we should validate * fingerprint is same and complain if it is not... */ if (ip->fileid == fileid && ip->gen == gen) { if (override) { /* * for a signed load we allow overrides, * otherwise fingerpints needed for pkg loads * can fail (the files are on temp device). */ ip->flags = flags; ip->ops = fpops; memcpy(ip->fingerprint, fingerprint, fpops->digest_len); } else if ((flags & (VERIEXEC_INDIRECT|VERIEXEC_FILE))) ip->flags |= flags; if (np) { /* unlikely but... we don't need it now. */ mtx_unlock(&ve_mutex); free(np, M_VERIEXEC); mtx_lock(&ve_mutex); } return (0); } } /* * We may have been past here before... */ if (np == NULL) { /* * We first try with mutex held and nowait. */ np = malloc(sizeof(struct mac_veriexec_file_info), M_VERIEXEC, M_NOWAIT); if (np == NULL) { /* * It was worth a try, now * drop mutex while we malloc. */ mtx_unlock(&ve_mutex); np = malloc(sizeof(struct mac_veriexec_file_info), M_VERIEXEC, M_WAITOK); mtx_lock(&ve_mutex); /* * We now have to repeat our search! */ goto search; } } /* Set up the meta-data entry */ ip = np; ip->flags = flags; ip->ops = fpops; ip->fileid = fileid; ip->gen = gen; memcpy(ip->fingerprint, fingerprint, fpops->digest_len); - VERIEXEC_DEBUG(3, ("add file %lu.%lu (files=%d)\n", ip->fileid, + VERIEXEC_DEBUG(3, ("add file %ju.%lu (files=%d)\n", + (uintmax_t)ip->fileid, ip->gen, file_dev)); /* Add the entry to the list */ LIST_INSERT_HEAD(&(lp->file_head), ip, entries); #ifdef DEBUG_VERIEXEC_FINGERPRINT { off_t offset; printf("Stored %s fingerprint:\n", fp_type); for (offset = 0; offset < fpops->digest_len; offset++) printf("%02x", fingerprint[offset]); printf("\n"); } #endif return (0); } /** * @brief Intialize the meta-data store */ void mac_veriexec_metadata_init(void) { mtx_init(&ve_mutex, "veriexec lock", NULL, MTX_DEF); LIST_INIT(&veriexec_dev_head); LIST_INIT(&veriexec_file_dev_head); }