diff --git a/sys/security/mac/mac_net.c b/sys/security/mac/mac_net.c index db3ade90f790..143d18252adb 100644 --- a/sys/security/mac/mac_net.c +++ b/sys/security/mac/mac_net.c @@ -34,50 +34,28 @@ * SUCH DAMAGE. */ -/* - * Framework for extensible kernel access control. Kernel and userland - * interface to the framework, policy registration and composition. - */ - #include __FBSDID("$FreeBSD$"); #include "opt_mac.h" -#include "opt_devfs.h" #include -#include -#include -#include #include #include #include #include #include -#include -#include #include #include -#include -#include -#include #include #include #include #include -#include #include #include -#include -#include -#include -#include - #include -#include - #include #include #include @@ -85,131 +63,24 @@ __FBSDID("$FreeBSD$"); #include #include -#ifdef MAC - -/* - * Declare that the kernel provides MAC support, version 1. This permits - * modules to refuse to be loaded if the necessary support isn't present, - * even if it's pre-boot. - */ -MODULE_VERSION(kernel_mac_support, 1); - -SYSCTL_DECL(_security); - -SYSCTL_NODE(_security, OID_AUTO, mac, CTLFLAG_RW, 0, - "TrustedBSD MAC policy controls"); - -#if MAC_MAX_SLOTS > 32 -#error "MAC_MAX_SLOTS too large" -#endif - -static unsigned int mac_max_slots = MAC_MAX_SLOTS; -static unsigned int mac_slot_offsets_free = (1 << MAC_MAX_SLOTS) - 1; -SYSCTL_UINT(_security_mac, OID_AUTO, max_slots, CTLFLAG_RD, - &mac_max_slots, 0, ""); - -/* - * Has the kernel started generating labeled objects yet? All read/write - * access to this variable is serialized during the boot process. Following - * the end of serialization, we don't update this flag; no locking. - */ -static int mac_late = 0; - -/* - * Warn about EA transactions only the first time they happen. - * Weak coherency, no locking. - */ -static int ea_warn_once = 0; - -/* - * Flag to indicate whether or not we should allocate label storage for - * new mbufs. Since most dynamic policies we currently work with don't - * rely on mbuf labeling, try to avoid paying the cost of mtag allocation - * unless specifically notified of interest. One result of this is - * that if a dynamically loaded policy requests mbuf labels, it must - * be able to deal with a NULL label being returned on any mbufs that - * were already in flight when the policy was loaded. Since the policy - * already has to deal with uninitialized labels, this probably won't - * be a problem. Note: currently no locking. Will this be a problem? - */ -#ifndef MAC_ALWAYS_LABEL_MBUF -static int mac_labelmbufs = 0; -#endif - -static int mac_enforce_fs = 1; -SYSCTL_INT(_security_mac, OID_AUTO, enforce_fs, CTLFLAG_RW, - &mac_enforce_fs, 0, "Enforce MAC policy on file system objects"); -TUNABLE_INT("security.mac.enforce_fs", &mac_enforce_fs); - -static int mac_enforce_kld = 1; -SYSCTL_INT(_security_mac, OID_AUTO, enforce_kld, CTLFLAG_RW, - &mac_enforce_kld, 0, "Enforce MAC policy on kld operations"); -TUNABLE_INT("security.mac.enforce_kld", &mac_enforce_kld); +#include static int mac_enforce_network = 1; SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW, &mac_enforce_network, 0, "Enforce MAC policy on network packets"); TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network); -static int mac_enforce_pipe = 1; -SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW, - &mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations"); -TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe); - -static int mac_enforce_process = 1; -SYSCTL_INT(_security_mac, OID_AUTO, enforce_process, CTLFLAG_RW, - &mac_enforce_process, 0, "Enforce MAC policy on inter-process operations"); -TUNABLE_INT("security.mac.enforce_process", &mac_enforce_process); - static int mac_enforce_socket = 1; SYSCTL_INT(_security_mac, OID_AUTO, enforce_socket, CTLFLAG_RW, &mac_enforce_socket, 0, "Enforce MAC policy on socket operations"); TUNABLE_INT("security.mac.enforce_socket", &mac_enforce_socket); -static int mac_enforce_system = 1; -SYSCTL_INT(_security_mac, OID_AUTO, enforce_system, CTLFLAG_RW, - &mac_enforce_system, 0, "Enforce MAC policy on system operations"); -TUNABLE_INT("security.mac.enforce_system", &mac_enforce_system); - -static int mac_enforce_vm = 1; -SYSCTL_INT(_security_mac, OID_AUTO, enforce_vm, CTLFLAG_RW, - &mac_enforce_vm, 0, "Enforce MAC policy on vm operations"); -TUNABLE_INT("security.mac.enforce_vm", &mac_enforce_vm); - -static int mac_mmap_revocation = 1; -SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation, CTLFLAG_RW, - &mac_mmap_revocation, 0, "Revoke mmap access to files on subject " - "relabel"); -static int mac_mmap_revocation_via_cow = 0; -SYSCTL_INT(_security_mac, OID_AUTO, mmap_revocation_via_cow, CTLFLAG_RW, - &mac_mmap_revocation_via_cow, 0, "Revoke mmap access to files via " - "copy-on-write semantics, or by removing all write access"); - #ifdef MAC_DEBUG -SYSCTL_NODE(_security_mac, OID_AUTO, debug, CTLFLAG_RW, 0, - "TrustedBSD MAC debug info"); - -static int mac_debug_label_fallback = 0; -SYSCTL_INT(_security_mac_debug, OID_AUTO, label_fallback, CTLFLAG_RW, - &mac_debug_label_fallback, 0, "Filesystems should fall back to fs label" - "when label is corrupted."); -TUNABLE_INT("security.mac.debug_label_fallback", - &mac_debug_label_fallback); - -SYSCTL_NODE(_security_mac_debug, OID_AUTO, counters, CTLFLAG_RW, 0, - "TrustedBSD MAC object counters"); - -static unsigned int nmacmbufs, nmaccreds, nmacifnets, nmacbpfdescs, - nmacsockets, nmacmounts, nmactemp, nmacvnodes, nmacdevfsdirents, - nmacipqs, nmacpipes, nmacprocs; - -#define MAC_DEBUG_COUNTER_INC(x) atomic_add_int(x, 1); -#define MAC_DEBUG_COUNTER_DEC(x) atomic_subtract_int(x, 1); +static unsigned int nmacmbufs, nmacifnets, nmacbpfdescs, nmacsockets, + nmacipqs; SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mbufs, CTLFLAG_RD, &nmacmbufs, 0, "number of mbufs in use"); -SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, creds, CTLFLAG_RD, - &nmaccreds, 0, "number of ucreds in use"); SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ifnets, CTLFLAG_RD, &nmacifnets, 0, "number of ifnets in use"); SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD, @@ -218,530 +89,10 @@ SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, bpfdescs, CTLFLAG_RD, &nmacbpfdescs, 0, "number of bpfdescs in use"); SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, sockets, CTLFLAG_RD, &nmacsockets, 0, "number of sockets in use"); -SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, pipes, CTLFLAG_RD, - &nmacpipes, 0, "number of pipes in use"); -SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, procs, CTLFLAG_RD, - &nmacprocs, 0, "number of procs in use"); -SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, mounts, CTLFLAG_RD, - &nmacmounts, 0, "number of mounts in use"); -SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, temp, CTLFLAG_RD, - &nmactemp, 0, "number of temporary labels in use"); -SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, vnodes, CTLFLAG_RD, - &nmacvnodes, 0, "number of vnodes in use"); -SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, devfsdirents, CTLFLAG_RD, - &nmacdevfsdirents, 0, "number of devfs dirents inuse"); -#else -#define MAC_DEBUG_COUNTER_INC(x) -#define MAC_DEBUG_COUNTER_DEC(x) #endif -static int error_select(int error1, int error2); -static int mac_policy_register(struct mac_policy_conf *mpc); -static int mac_policy_unregister(struct mac_policy_conf *mpc); - -static void mac_check_vnode_mmap_downgrade(struct ucred *cred, - struct vnode *vp, int *prot); -static void mac_cred_mmapped_drop_perms_recurse(struct thread *td, - struct ucred *cred, struct vm_map *map); - static void mac_destroy_socket_label(struct label *label); -static int mac_setlabel_vnode_extattr(struct ucred *cred, - struct vnode *vp, struct label *intlabel); - -MALLOC_DEFINE(M_MACPIPELABEL, "macpipelabel", "MAC labels for pipes"); -MALLOC_DEFINE(M_MACTEMP, "mactemp", "MAC temporary label storage"); - -/* - * mac_static_policy_list holds a list of policy modules that are not - * loaded while the system is "live", and cannot be unloaded. These - * policies can be invoked without holding the busy count. - * - * mac_policy_list stores the list of dynamic policies. A busy count is - * maintained for the list, stored in mac_policy_busy. The busy count - * is protected by mac_policy_mtx; the list may be modified only - * while the busy count is 0, requiring that the lock be held to - * prevent new references to the list from being acquired. For almost - * all operations, incrementing the busy count is sufficient to - * guarantee consistency, as the list cannot be modified while the - * busy count is elevated. For a few special operations involving a - * change to the list of active policies, the mtx itself must be held. - * A condition variable, mac_policy_cv, is used to signal potential - * exclusive consumers that they should try to acquire the lock if a - * first attempt at exclusive access fails. - */ -static struct mtx mac_policy_mtx; -static struct cv mac_policy_cv; -static int mac_policy_count; -static LIST_HEAD(, mac_policy_conf) mac_policy_list; -static LIST_HEAD(, mac_policy_conf) mac_static_policy_list; - -/* - * We manually invoke WITNESS_WARN() to allow Witness to generate - * warnings even if we don't end up ever triggering the wait at - * run-time. The consumer of the exclusive interface must not hold - * any locks (other than potentially Giant) since we may sleep for - * long (potentially indefinite) periods of time waiting for the - * framework to become quiescent so that a policy list change may - * be made. - */ -static __inline void -mac_policy_grab_exclusive(void) -{ - WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, - "mac_policy_grab_exclusive() at %s:%d", __FILE__, __LINE__); - mtx_lock(&mac_policy_mtx); - while (mac_policy_count != 0) - cv_wait(&mac_policy_cv, &mac_policy_mtx); -} - -static __inline void -mac_policy_assert_exclusive(void) -{ - mtx_assert(&mac_policy_mtx, MA_OWNED); - KASSERT(mac_policy_count == 0, - ("mac_policy_assert_exclusive(): not exclusive")); -} - -static __inline void -mac_policy_release_exclusive(void) -{ - - KASSERT(mac_policy_count == 0, - ("mac_policy_release_exclusive(): not exclusive")); - mtx_unlock(&mac_policy_mtx); - cv_signal(&mac_policy_cv); -} - -static __inline void -mac_policy_list_busy(void) -{ - mtx_lock(&mac_policy_mtx); - mac_policy_count++; - mtx_unlock(&mac_policy_mtx); -} - -static __inline int -mac_policy_list_conditional_busy(void) -{ - int ret; - - mtx_lock(&mac_policy_mtx); - if (!LIST_EMPTY(&mac_policy_list)) { - mac_policy_count++; - ret = 1; - } else - ret = 0; - mtx_unlock(&mac_policy_mtx); - return (ret); -} - -static __inline void -mac_policy_list_unbusy(void) -{ - mtx_lock(&mac_policy_mtx); - mac_policy_count--; - KASSERT(mac_policy_count >= 0, ("MAC_POLICY_LIST_LOCK")); - if (mac_policy_count == 0) - cv_signal(&mac_policy_cv); - mtx_unlock(&mac_policy_mtx); -} - -/* - * MAC_CHECK performs the designated check by walking the policy - * module list and checking with each as to how it feels about the - * request. Note that it returns its value via 'error' in the scope - * of the caller. - */ -#define MAC_CHECK(check, args...) do { \ - struct mac_policy_conf *mpc; \ - int entrycount; \ - \ - error = 0; \ - LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ - if (mpc->mpc_ops->mpo_ ## check != NULL) \ - error = error_select( \ - mpc->mpc_ops->mpo_ ## check (args), \ - error); \ - } \ - if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ - LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ - if (mpc->mpc_ops->mpo_ ## check != NULL) \ - error = error_select( \ - mpc->mpc_ops->mpo_ ## check (args), \ - error); \ - } \ - mac_policy_list_unbusy(); \ - } \ -} while (0) - -/* - * MAC_BOOLEAN performs the designated boolean composition by walking - * the module list, invoking each instance of the operation, and - * combining the results using the passed C operator. Note that it - * returns its value via 'result' in the scope of the caller, which - * should be initialized by the caller in a meaningful way to get - * a meaningful result. - */ -#define MAC_BOOLEAN(operation, composition, args...) do { \ - struct mac_policy_conf *mpc; \ - int entrycount; \ - \ - LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ - if (mpc->mpc_ops->mpo_ ## operation != NULL) \ - result = result composition \ - mpc->mpc_ops->mpo_ ## operation (args); \ - } \ - if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ - LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ - if (mpc->mpc_ops->mpo_ ## operation != NULL) \ - result = result composition \ - mpc->mpc_ops->mpo_ ## operation \ - (args); \ - } \ - mac_policy_list_unbusy(); \ - } \ -} while (0) - -#define MAC_EXTERNALIZE(type, label, elementlist, outbuf, \ - outbuflen) do { \ - int claimed, first, ignorenotfound, savedlen; \ - char *element_name, *element_temp; \ - struct sbuf sb; \ - \ - error = 0; \ - first = 1; \ - sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \ - element_temp = elementlist; \ - while ((element_name = strsep(&element_temp, ",")) != NULL) { \ - if (element_name[0] == '?') { \ - element_name++; \ - ignorenotfound = 1; \ - } else \ - ignorenotfound = 0; \ - savedlen = sbuf_len(&sb); \ - if (first) { \ - error = sbuf_printf(&sb, "%s/", element_name); \ - first = 0; \ - } else \ - error = sbuf_printf(&sb, ",%s/", element_name); \ - if (error == -1) { \ - error = EINVAL; /* XXX: E2BIG? */ \ - break; \ - } \ - claimed = 0; \ - MAC_CHECK(externalize_ ## type, label, element_name, \ - &sb, &claimed); \ - if (error) \ - break; \ - if (claimed == 0 && ignorenotfound) { \ - /* Revert last label name. */ \ - sbuf_setpos(&sb, savedlen); \ - } else if (claimed != 1) { \ - error = EINVAL; /* XXX: ENOLABEL? */ \ - break; \ - } \ - } \ - sbuf_finish(&sb); \ -} while (0) - -#define MAC_INTERNALIZE(type, label, instring) do { \ - char *element, *element_name, *element_data; \ - int claimed; \ - \ - error = 0; \ - element = instring; \ - while ((element_name = strsep(&element, ",")) != NULL) { \ - element_data = element_name; \ - element_name = strsep(&element_data, "/"); \ - if (element_data == NULL) { \ - error = EINVAL; \ - break; \ - } \ - claimed = 0; \ - MAC_CHECK(internalize_ ## type, label, element_name, \ - element_data, &claimed); \ - if (error) \ - break; \ - if (claimed != 1) { \ - /* XXXMAC: Another error here? */ \ - error = EINVAL; \ - break; \ - } \ - } \ -} while (0) - -/* - * MAC_PERFORM performs the designated operation by walking the policy - * module list and invoking that operation for each policy. - */ -#define MAC_PERFORM(operation, args...) do { \ - struct mac_policy_conf *mpc; \ - int entrycount; \ - \ - LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \ - if (mpc->mpc_ops->mpo_ ## operation != NULL) \ - mpc->mpc_ops->mpo_ ## operation (args); \ - } \ - if ((entrycount = mac_policy_list_conditional_busy()) != 0) { \ - LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \ - if (mpc->mpc_ops->mpo_ ## operation != NULL) \ - mpc->mpc_ops->mpo_ ## operation (args); \ - } \ - mac_policy_list_unbusy(); \ - } \ -} while (0) - -/* - * Initialize the MAC subsystem, including appropriate SMP locks. - */ -static void -mac_init(void) -{ - - LIST_INIT(&mac_static_policy_list); - LIST_INIT(&mac_policy_list); - - mtx_init(&mac_policy_mtx, "mac_policy_mtx", NULL, MTX_DEF); - cv_init(&mac_policy_cv, "mac_policy_cv"); -} - -/* - * For the purposes of modules that want to know if they were loaded - * "early", set the mac_late flag once we've processed modules either - * linked into the kernel, or loaded before the kernel startup. - */ -static void -mac_late_init(void) -{ - - mac_late = 1; -} - -/* - * After the policy list has changed, walk the list to update any global - * flags. Currently, we support only one flag, and it's conditionally - * defined; as a result, the entire function is conditional. Eventually, - * the #else case might also iterate across the policies. - */ -static void -mac_policy_updateflags(void) -{ -#ifndef MAC_ALWAYS_LABEL_MBUF - struct mac_policy_conf *tmpc; - int labelmbufs; - - mac_policy_assert_exclusive(); - - labelmbufs = 0; - LIST_FOREACH(tmpc, &mac_static_policy_list, mpc_list) { - if (tmpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_LABELMBUFS) - labelmbufs++; - } - LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { - if (tmpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_LABELMBUFS) - labelmbufs++; - } - mac_labelmbufs = (labelmbufs != 0); -#endif -} - -/* - * Allow MAC policy modules to register during boot, etc. - */ -int -mac_policy_modevent(module_t mod, int type, void *data) -{ - struct mac_policy_conf *mpc; - int error; - - error = 0; - mpc = (struct mac_policy_conf *) data; - - switch (type) { - case MOD_LOAD: - if (mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_NOTLATE && - mac_late) { - printf("mac_policy_modevent: can't load %s policy " - "after booting\n", mpc->mpc_name); - error = EBUSY; - break; - } - error = mac_policy_register(mpc); - break; - case MOD_UNLOAD: - /* Don't unregister the module if it was never registered. */ - if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) - != 0) - error = mac_policy_unregister(mpc); - else - error = 0; - break; - default: - break; - } - - return (error); -} - -static int -mac_policy_register(struct mac_policy_conf *mpc) -{ - struct mac_policy_conf *tmpc; - int error, slot, static_entry; - - error = 0; - - /* - * We don't technically need exclusive access while !mac_late, - * but hold it for assertion consistency. - */ - mac_policy_grab_exclusive(); - - /* - * If the module can potentially be unloaded, or we're loading - * late, we have to stick it in the non-static list and pay - * an extra performance overhead. Otherwise, we can pay a - * light locking cost and stick it in the static list. - */ - static_entry = (!mac_late && - !(mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK)); - - if (static_entry) { - LIST_FOREACH(tmpc, &mac_static_policy_list, mpc_list) { - if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { - error = EEXIST; - goto out; - } - } - } else { - LIST_FOREACH(tmpc, &mac_policy_list, mpc_list) { - if (strcmp(tmpc->mpc_name, mpc->mpc_name) == 0) { - error = EEXIST; - goto out; - } - } - } - if (mpc->mpc_field_off != NULL) { - slot = ffs(mac_slot_offsets_free); - if (slot == 0) { - error = ENOMEM; - goto out; - } - slot--; - mac_slot_offsets_free &= ~(1 << slot); - *mpc->mpc_field_off = slot; - } - mpc->mpc_runtime_flags |= MPC_RUNTIME_FLAG_REGISTERED; - - /* - * If we're loading a MAC module after the framework has - * initialized, it has to go into the dynamic list. If - * we're loading it before we've finished initializing, - * it can go into the static list with weaker locker - * requirements. - */ - if (static_entry) - LIST_INSERT_HEAD(&mac_static_policy_list, mpc, mpc_list); - else - LIST_INSERT_HEAD(&mac_policy_list, mpc, mpc_list); - - /* Per-policy initialization. */ - if (mpc->mpc_ops->mpo_init != NULL) - (*(mpc->mpc_ops->mpo_init))(mpc); - mac_policy_updateflags(); - - printf("Security policy loaded: %s (%s)\n", mpc->mpc_fullname, - mpc->mpc_name); - -out: - mac_policy_release_exclusive(); - return (error); -} - -static int -mac_policy_unregister(struct mac_policy_conf *mpc) -{ - - /* - * If we fail the load, we may get a request to unload. Check - * to see if we did the run-time registration, and if not, - * silently succeed. - */ - mac_policy_grab_exclusive(); - if ((mpc->mpc_runtime_flags & MPC_RUNTIME_FLAG_REGISTERED) == 0) { - mac_policy_release_exclusive(); - return (0); - } -#if 0 - /* - * Don't allow unloading modules with private data. - */ - if (mpc->mpc_field_off != NULL) { - MAC_POLICY_LIST_UNLOCK(); - return (EBUSY); - } -#endif - /* - * Only allow the unload to proceed if the module is unloadable - * by its own definition. - */ - if ((mpc->mpc_loadtime_flags & MPC_LOADTIME_FLAG_UNLOADOK) == 0) { - mac_policy_release_exclusive(); - return (EBUSY); - } - if (mpc->mpc_ops->mpo_destroy != NULL) - (*(mpc->mpc_ops->mpo_destroy))(mpc); - - LIST_REMOVE(mpc, mpc_list); - mpc->mpc_runtime_flags &= ~MPC_RUNTIME_FLAG_REGISTERED; - mac_policy_updateflags(); - - mac_policy_release_exclusive(); - - printf("Security policy unload: %s (%s)\n", mpc->mpc_fullname, - mpc->mpc_name); - - return (0); -} - -/* - * Define an error value precedence, and given two arguments, selects the - * value with the higher precedence. - */ -static int -error_select(int error1, int error2) -{ - - /* Certain decision-making errors take top priority. */ - if (error1 == EDEADLK || error2 == EDEADLK) - return (EDEADLK); - - /* Invalid arguments should be reported where possible. */ - if (error1 == EINVAL || error2 == EINVAL) - return (EINVAL); - - /* Precedence goes to "visibility", with both process and file. */ - if (error1 == ESRCH || error2 == ESRCH) - return (ESRCH); - - if (error1 == ENOENT || error2 == ENOENT) - return (ENOENT); - - /* Precedence goes to DAC/MAC protections. */ - if (error1 == EACCES || error2 == EACCES) - return (EACCES); - - /* Precedence goes to privilege. */ - if (error1 == EPERM || error2 == EPERM) - return (EPERM); - - /* Precedence goes to error over success; otherwise, arbitrary. */ - if (error1 != 0) - return (error1); - return (error2); -} - static struct label * mbuf_to_label(struct mbuf *mbuf) { @@ -754,25 +105,6 @@ mbuf_to_label(struct mbuf *mbuf) return (label); } -static void -mac_init_label(struct label *label) -{ - - bzero(label, sizeof(*label)); - label->l_flags = MAC_FLAG_INITIALIZED; -} - -static void -mac_destroy_label(struct label *label) -{ - - KASSERT(label->l_flags & MAC_FLAG_INITIALIZED, - ("destroying uninitialized label")); - - bzero(label, sizeof(*label)); - /* implicit: label->l_flags &= ~MAC_FLAG_INITIALIZED; */ -} - void mac_init_bpfdesc(struct bpf_d *bpf_d) { @@ -782,31 +114,6 @@ mac_init_bpfdesc(struct bpf_d *bpf_d) MAC_DEBUG_COUNTER_INC(&nmacbpfdescs); } -static void -mac_init_cred_label(struct label *label) -{ - - mac_init_label(label); - MAC_PERFORM(init_cred_label, label); - MAC_DEBUG_COUNTER_INC(&nmaccreds); -} - -void -mac_init_cred(struct ucred *cred) -{ - - mac_init_cred_label(&cred->cr_label); -} - -void -mac_init_devfsdirent(struct devfs_dirent *de) -{ - - mac_init_label(&de->de_label); - MAC_PERFORM(init_devfsdirent_label, &de->de_label); - MAC_DEBUG_COUNTER_INC(&nmacdevfsdirents); -} - static void mac_init_ifnet_label(struct label *label) { @@ -888,46 +195,6 @@ mac_init_mbuf(struct mbuf *m, int flag) return (0); } -void -mac_init_mount(struct mount *mp) -{ - - mac_init_label(&mp->mnt_mntlabel); - mac_init_label(&mp->mnt_fslabel); - MAC_PERFORM(init_mount_label, &mp->mnt_mntlabel); - MAC_PERFORM(init_mount_fs_label, &mp->mnt_fslabel); - MAC_DEBUG_COUNTER_INC(&nmacmounts); -} - -static void -mac_init_pipe_label(struct label *label) -{ - - mac_init_label(label); - MAC_PERFORM(init_pipe_label, label); - MAC_DEBUG_COUNTER_INC(&nmacpipes); -} - -void -mac_init_pipe(struct pipe *pipe) -{ - struct label *label; - - label = malloc(sizeof(struct label), M_MACPIPELABEL, M_ZERO|M_WAITOK); - pipe->pipe_label = label; - pipe->pipe_peer->pipe_label = label; - mac_init_pipe_label(label); -} - -void -mac_init_proc(struct proc *p) -{ - - mac_init_label(&p->p_label); - MAC_PERFORM(init_proc_label, &p->p_label); - MAC_DEBUG_COUNTER_INC(&nmacprocs); -} - static int mac_init_socket_label(struct label *label, int flag) { @@ -978,22 +245,6 @@ mac_init_socket(struct socket *socket, int flag) return (error); } -void -mac_init_vnode_label(struct label *label) -{ - - mac_init_label(label); - MAC_PERFORM(init_vnode_label, label); - MAC_DEBUG_COUNTER_INC(&nmacvnodes); -} - -void -mac_init_vnode(struct vnode *vp) -{ - - mac_init_vnode_label(&vp->v_label); -} - void mac_destroy_bpfdesc(struct bpf_d *bpf_d) { @@ -1003,31 +254,6 @@ mac_destroy_bpfdesc(struct bpf_d *bpf_d) MAC_DEBUG_COUNTER_DEC(&nmacbpfdescs); } -static void -mac_destroy_cred_label(struct label *label) -{ - - MAC_PERFORM(destroy_cred_label, label); - mac_destroy_label(label); - MAC_DEBUG_COUNTER_DEC(&nmaccreds); -} - -void -mac_destroy_cred(struct ucred *cred) -{ - - mac_destroy_cred_label(&cred->cr_label); -} - -void -mac_destroy_devfsdirent(struct devfs_dirent *de) -{ - - MAC_PERFORM(destroy_devfsdirent_label, &de->de_label); - mac_destroy_label(&de->de_label); - MAC_DEBUG_COUNTER_DEC(&nmacdevfsdirents); -} - static void mac_destroy_ifnet_label(struct label *label) { @@ -1065,43 +291,6 @@ mac_destroy_mbuf_tag(struct m_tag *tag) MAC_DEBUG_COUNTER_DEC(&nmacmbufs); } -void -mac_destroy_mount(struct mount *mp) -{ - - MAC_PERFORM(destroy_mount_label, &mp->mnt_mntlabel); - MAC_PERFORM(destroy_mount_fs_label, &mp->mnt_fslabel); - mac_destroy_label(&mp->mnt_fslabel); - mac_destroy_label(&mp->mnt_mntlabel); - MAC_DEBUG_COUNTER_DEC(&nmacmounts); -} - -static void -mac_destroy_pipe_label(struct label *label) -{ - - MAC_PERFORM(destroy_pipe_label, label); - mac_destroy_label(label); - MAC_DEBUG_COUNTER_DEC(&nmacpipes); -} - -void -mac_destroy_pipe(struct pipe *pipe) -{ - - mac_destroy_pipe_label(pipe->pipe_label); - free(pipe->pipe_label, M_MACPIPELABEL); -} - -void -mac_destroy_proc(struct proc *p) -{ - - MAC_PERFORM(destroy_proc_label, &p->p_label); - mac_destroy_label(&p->p_label); - MAC_DEBUG_COUNTER_DEC(&nmacprocs); -} - static void mac_destroy_socket_label(struct label *label) { @@ -1127,22 +316,6 @@ mac_destroy_socket(struct socket *socket) mac_destroy_socket_peer_label(&socket->so_peerlabel); } -void -mac_destroy_vnode_label(struct label *label) -{ - - MAC_PERFORM(destroy_vnode_label, label); - mac_destroy_label(label); - MAC_DEBUG_COUNTER_DEC(&nmacvnodes); -} - -void -mac_destroy_vnode(struct vnode *vp) -{ - - mac_destroy_vnode_label(&vp->v_label); -} - void mac_copy_mbuf_tag(struct m_tag *src, struct m_tag *dest) { @@ -1158,42 +331,6 @@ mac_copy_mbuf_tag(struct m_tag *src, struct m_tag *dest) MAC_PERFORM(copy_mbuf_label, src_label, dest_label); } -static void -mac_copy_pipe_label(struct label *src, struct label *dest) -{ - - MAC_PERFORM(copy_pipe_label, src, dest); -} - -void -mac_copy_vnode_label(struct label *src, struct label *dest) -{ - - MAC_PERFORM(copy_vnode_label, src, dest); -} - -static int -mac_check_structmac_consistent(struct mac *mac) -{ - - if (mac->m_buflen < 0 || - mac->m_buflen > MAC_MAX_LABEL_BUF_LEN) - return (EINVAL); - - return (0); -} - -static int -mac_externalize_cred_label(struct label *label, char *elements, - char *outbuf, size_t outbuflen, int flags) -{ - int error; - - MAC_EXTERNALIZE(cred_label, label, elements, outbuf, outbuflen); - - return (error); -} - static int mac_externalize_ifnet_label(struct label *label, char *elements, char *outbuf, size_t outbuflen, int flags) @@ -1205,17 +342,6 @@ mac_externalize_ifnet_label(struct label *label, char *elements, return (error); } -static int -mac_externalize_pipe_label(struct label *label, char *elements, - char *outbuf, size_t outbuflen, int flags) -{ - int error; - - MAC_EXTERNALIZE(pipe_label, label, elements, outbuf, outbuflen); - - return (error); -} - static int mac_externalize_socket_label(struct label *label, char *elements, char *outbuf, size_t outbuflen, int flags) @@ -1238,27 +364,6 @@ mac_externalize_socket_peer_label(struct label *label, char *elements, return (error); } -static int -mac_externalize_vnode_label(struct label *label, char *elements, - char *outbuf, size_t outbuflen, int flags) -{ - int error; - - MAC_EXTERNALIZE(vnode_label, label, elements, outbuf, outbuflen); - - return (error); -} - -static int -mac_internalize_cred_label(struct label *label, char *string) -{ - int error; - - MAC_INTERNALIZE(cred_label, label, string); - - return (error); -} - static int mac_internalize_ifnet_label(struct label *label, char *string) { @@ -1269,16 +374,6 @@ mac_internalize_ifnet_label(struct label *label, char *string) return (error); } -static int -mac_internalize_pipe_label(struct label *label, char *string) -{ - int error; - - MAC_INTERNALIZE(pipe_label, label, string); - - return (error); -} - static int mac_internalize_socket_label(struct label *label, char *string) { @@ -1289,925 +384,6 @@ mac_internalize_socket_label(struct label *label, char *string) return (error); } -static int -mac_internalize_vnode_label(struct label *label, char *string) -{ - int error; - - MAC_INTERNALIZE(vnode_label, label, string); - - return (error); -} - -/* - * Initialize MAC label for the first kernel process, from which other - * kernel processes and threads are spawned. - */ -void -mac_create_proc0(struct ucred *cred) -{ - - MAC_PERFORM(create_proc0, cred); -} - -/* - * Initialize MAC label for the first userland process, from which other - * userland processes and threads are spawned. - */ -void -mac_create_proc1(struct ucred *cred) -{ - - MAC_PERFORM(create_proc1, cred); -} - -void -mac_thread_userret(struct thread *td) -{ - - MAC_PERFORM(thread_userret, td); -} - -/* - * When a new process is created, its label must be initialized. Generally, - * this involves inheritence from the parent process, modulo possible - * deltas. This function allows that processing to take place. - */ -void -mac_create_cred(struct ucred *parent_cred, struct ucred *child_cred) -{ - - MAC_PERFORM(create_cred, parent_cred, child_cred); -} - -void -mac_update_devfsdirent(struct mount *mp, struct devfs_dirent *de, - struct vnode *vp) -{ - - MAC_PERFORM(update_devfsdirent, mp, de, &de->de_label, vp, - &vp->v_label); -} - -void -mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de, - struct vnode *vp) -{ - - MAC_PERFORM(associate_vnode_devfs, mp, &mp->mnt_fslabel, de, - &de->de_label, vp, &vp->v_label); -} - -int -mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr"); - - MAC_CHECK(associate_vnode_extattr, mp, &mp->mnt_fslabel, vp, - &vp->v_label); - - return (error); -} - -void -mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp) -{ - - MAC_PERFORM(associate_vnode_singlelabel, mp, &mp->mnt_fslabel, vp, - &vp->v_label); -} - -int -mac_create_vnode_extattr(struct ucred *cred, struct mount *mp, - struct vnode *dvp, struct vnode *vp, struct componentname *cnp) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr"); - ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr"); - - error = VOP_OPENEXTATTR(vp, cred, curthread); - if (error == EOPNOTSUPP) { - /* XXX: Optionally abort if transactions not supported. */ - if (ea_warn_once == 0) { - printf("Warning: transactions not supported " - "in EA write.\n"); - ea_warn_once = 1; - } - } else if (error) - return (error); - - MAC_CHECK(create_vnode_extattr, cred, mp, &mp->mnt_fslabel, - dvp, &dvp->v_label, vp, &vp->v_label, cnp); - - if (error) { - VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); - return (error); - } - - error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); - - if (error == EOPNOTSUPP) - error = 0; /* XXX */ - - return (error); -} - -static int -mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, - struct label *intlabel) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr"); - - error = VOP_OPENEXTATTR(vp, cred, curthread); - if (error == EOPNOTSUPP) { - /* XXX: Optionally abort if transactions not supported. */ - if (ea_warn_once == 0) { - printf("Warning: transactions not supported " - "in EA write.\n"); - ea_warn_once = 1; - } - } else if (error) - return (error); - - MAC_CHECK(setlabel_vnode_extattr, cred, vp, &vp->v_label, intlabel); - - if (error) { - VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); - return (error); - } - - error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); - - if (error == EOPNOTSUPP) - error = 0; /* XXX */ - - return (error); -} - -int -mac_execve_enter(struct image_params *imgp, struct mac *mac_p, - struct label *execlabelstorage) -{ - struct mac mac; - char *buffer; - int error; - - if (mac_p == NULL) - return (0); - - error = copyin(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); - } - - mac_init_cred_label(execlabelstorage); - error = mac_internalize_cred_label(execlabelstorage, buffer); - free(buffer, M_MACTEMP); - if (error) { - mac_destroy_cred_label(execlabelstorage); - return (error); - } - imgp->execlabel = execlabelstorage; - return (0); -} - -void -mac_execve_exit(struct image_params *imgp) -{ - if (imgp->execlabel != NULL) - mac_destroy_cred_label(imgp->execlabel); -} - -void -mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp, - struct label *interpvnodelabel, struct image_params *imgp) -{ - - ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); - - if (!mac_enforce_process && !mac_enforce_fs) - return; - - MAC_PERFORM(execve_transition, old, new, vp, &vp->v_label, - interpvnodelabel, imgp, imgp->execlabel); -} - -int -mac_execve_will_transition(struct ucred *old, struct vnode *vp, - struct label *interpvnodelabel, struct image_params *imgp) -{ - int result; - - ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition"); - - if (!mac_enforce_process && !mac_enforce_fs) - return (0); - - result = 0; - MAC_BOOLEAN(execve_will_transition, ||, old, vp, &vp->v_label, - interpvnodelabel, imgp, imgp->execlabel); - - return (result); -} - -int -mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_access, cred, vp, &vp->v_label, acc_mode); - return (error); -} - -int -mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_chdir, cred, dvp, &dvp->v_label); - return (error); -} - -int -mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_chroot, cred, dvp, &dvp->v_label); - return (error); -} - -int -mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, - struct componentname *cnp, struct vattr *vap) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_create, cred, dvp, &dvp->v_label, cnp, vap); - return (error); -} - -int -mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, - struct componentname *cnp) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_delete, cred, dvp, &dvp->v_label, vp, - &vp->v_label, cnp); - return (error); -} - -int -mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, - acl_type_t type) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_deleteacl, cred, vp, &vp->v_label, type); - return (error); -} - -int -mac_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp, - int attrnamespace, const char *name) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteextattr"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_deleteextattr, cred, vp, &vp->v_label, - attrnamespace, name); - return (error); -} - -int -mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, - struct image_params *imgp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); - - if (!mac_enforce_process && !mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_exec, cred, vp, &vp->v_label, imgp, - imgp->execlabel); - - return (error); -} - -int -mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_getacl, cred, vp, &vp->v_label, type); - return (error); -} - -int -mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, - int attrnamespace, const char *name, struct uio *uio) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_getextattr, cred, vp, &vp->v_label, - attrnamespace, name, uio); - return (error); -} - -int -mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, - struct vnode *vp, struct componentname *cnp) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_link, cred, dvp, &dvp->v_label, vp, - &vp->v_label, cnp); - return (error); -} - -int -mac_check_vnode_listextattr(struct ucred *cred, struct vnode *vp, - int attrnamespace) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_listextattr"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_listextattr, cred, vp, &vp->v_label, - attrnamespace); - return (error); -} - -int -mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, - struct componentname *cnp) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_lookup, cred, dvp, &dvp->v_label, cnp); - return (error); -} - -int -mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, int prot) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); - - if (!mac_enforce_fs || !mac_enforce_vm) - return (0); - - MAC_CHECK(check_vnode_mmap, cred, vp, &vp->v_label, prot); - return (error); -} - -void -mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) -{ - int result = *prot; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); - - if (!mac_enforce_fs || !mac_enforce_vm) - return; - - MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, &vp->v_label, - &result); - - *prot = result; -} - -int -mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); - - if (!mac_enforce_fs || !mac_enforce_vm) - return (0); - - MAC_CHECK(check_vnode_mprotect, cred, vp, &vp->v_label, prot); - return (error); -} - -int -mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_open, cred, vp, &vp->v_label, acc_mode); - return (error); -} - -int -mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, - struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, - &vp->v_label); - - return (error); -} - -int -mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, - struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, - &vp->v_label); - - return (error); -} - -int -mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_readdir, cred, dvp, &dvp->v_label); - return (error); -} - -int -mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_readlink, cred, vp, &vp->v_label); - return (error); -} - -static int -mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, - struct label *newlabel) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); - - MAC_CHECK(check_vnode_relabel, cred, vp, &vp->v_label, newlabel); - - return (error); -} - -int -mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, - struct vnode *vp, struct componentname *cnp) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_rename_from, cred, dvp, &dvp->v_label, vp, - &vp->v_label, cnp); - return (error); -} - -int -mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, - struct vnode *vp, int samedir, struct componentname *cnp) -{ - int error; - - ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_rename_to, cred, dvp, &dvp->v_label, vp, - vp != NULL ? &vp->v_label : NULL, samedir, cnp); - return (error); -} - -int -mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_revoke, cred, vp, &vp->v_label); - return (error); -} - -int -mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, - struct acl *acl) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_setacl, cred, vp, &vp->v_label, type, acl); - return (error); -} - -int -mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, - int attrnamespace, const char *name, struct uio *uio) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_setextattr, cred, vp, &vp->v_label, - attrnamespace, name, uio); - return (error); -} - -int -mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_setflags, cred, vp, &vp->v_label, flags); - return (error); -} - -int -mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_setmode, cred, vp, &vp->v_label, mode); - return (error); -} - -int -mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, - gid_t gid) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_setowner, cred, vp, &vp->v_label, uid, gid); - return (error); -} - -int -mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, - struct timespec atime, struct timespec mtime) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_setutimes, cred, vp, &vp->v_label, atime, - mtime); - return (error); -} - -int -mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, - struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, - &vp->v_label); - return (error); -} - -int -mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, - struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, - &vp->v_label); - - return (error); -} - -/* - * When relabeling a process, call out to the policies for the maximum - * permission allowed for each object type we know about in its - * memory space, and revoke access (in the least surprising ways we - * know) when necessary. The process lock is not held here. - */ -void -mac_cred_mmapped_drop_perms(struct thread *td, struct ucred *cred) -{ - - /* XXX freeze all other threads */ - mac_cred_mmapped_drop_perms_recurse(td, cred, - &td->td_proc->p_vmspace->vm_map); - /* XXX allow other threads to continue */ -} - -static __inline const char * -prot2str(vm_prot_t prot) -{ - - switch (prot & VM_PROT_ALL) { - case VM_PROT_READ: - return ("r--"); - case VM_PROT_READ | VM_PROT_WRITE: - return ("rw-"); - case VM_PROT_READ | VM_PROT_EXECUTE: - return ("r-x"); - case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: - return ("rwx"); - case VM_PROT_WRITE: - return ("-w-"); - case VM_PROT_EXECUTE: - return ("--x"); - case VM_PROT_WRITE | VM_PROT_EXECUTE: - return ("-wx"); - default: - return ("---"); - } -} - -static void -mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred, - struct vm_map *map) -{ - struct vm_map_entry *vme; - int result; - vm_prot_t revokeperms; - vm_object_t object; - vm_ooffset_t offset; - struct vnode *vp; - - if (!mac_mmap_revocation) - return; - - vm_map_lock_read(map); - for (vme = map->header.next; vme != &map->header; vme = vme->next) { - if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) { - mac_cred_mmapped_drop_perms_recurse(td, cred, - vme->object.sub_map); - continue; - } - /* - * Skip over entries that obviously are not shared. - */ - if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) || - !vme->max_protection) - continue; - /* - * Drill down to the deepest backing object. - */ - offset = vme->offset; - object = vme->object.vm_object; - if (object == NULL) - continue; - while (object->backing_object != NULL) { - object = object->backing_object; - offset += object->backing_object_offset; - } - /* - * At the moment, vm_maps and objects aren't considered - * by the MAC system, so only things with backing by a - * normal object (read: vnodes) are checked. - */ - if (object->type != OBJT_VNODE) - continue; - vp = (struct vnode *)object->handle; - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); - result = vme->max_protection; - mac_check_vnode_mmap_downgrade(cred, vp, &result); - VOP_UNLOCK(vp, 0, td); - /* - * Find out what maximum protection we may be allowing - * now but a policy needs to get removed. - */ - revokeperms = vme->max_protection & ~result; - if (!revokeperms) - continue; - printf("pid %ld: revoking %s perms from %#lx:%ld " - "(max %s/cur %s)\n", (long)td->td_proc->p_pid, - prot2str(revokeperms), (u_long)vme->start, - (long)(vme->end - vme->start), - prot2str(vme->max_protection), prot2str(vme->protection)); - vm_map_lock_upgrade(map); - /* - * This is the really simple case: if a map has more - * max_protection than is allowed, but it's not being - * actually used (that is, the current protection is - * still allowed), we can just wipe it out and do - * nothing more. - */ - if ((vme->protection & revokeperms) == 0) { - vme->max_protection -= revokeperms; - } else { - if (revokeperms & VM_PROT_WRITE) { - /* - * In the more complicated case, flush out all - * pending changes to the object then turn it - * copy-on-write. - */ - vm_object_reference(object); - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); - VM_OBJECT_LOCK(object); - vm_object_page_clean(object, - OFF_TO_IDX(offset), - OFF_TO_IDX(offset + vme->end - vme->start + - PAGE_MASK), - OBJPC_SYNC); - VM_OBJECT_UNLOCK(object); - VOP_UNLOCK(vp, 0, td); - vm_object_deallocate(object); - /* - * Why bother if there's no read permissions - * anymore? For the rest, we need to leave - * the write permissions on for COW, or - * remove them entirely if configured to. - */ - if (!mac_mmap_revocation_via_cow) { - vme->max_protection &= ~VM_PROT_WRITE; - vme->protection &= ~VM_PROT_WRITE; - } if ((revokeperms & VM_PROT_READ) == 0) - vme->eflags |= MAP_ENTRY_COW | - MAP_ENTRY_NEEDS_COPY; - } - if (revokeperms & VM_PROT_EXECUTE) { - vme->max_protection &= ~VM_PROT_EXECUTE; - vme->protection &= ~VM_PROT_EXECUTE; - } - if (revokeperms & VM_PROT_READ) { - vme->max_protection = 0; - vme->protection = 0; - } - pmap_protect(map->pmap, vme->start, vme->end, - vme->protection & ~revokeperms); - vm_map_simplify_entry(map, vme); - } - vm_map_lock_downgrade(map); - } - vm_map_unlock_read(map); -} - -/* - * When the subject's label changes, it may require revocation of privilege - * to mapped objects. This can't be done on-the-fly later with a unified - * buffer cache. - */ -static void -mac_relabel_cred(struct ucred *cred, struct label *newlabel) -{ - - MAC_PERFORM(relabel_cred, cred, newlabel); -} - -void -mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) -{ - - MAC_PERFORM(relabel_vnode, cred, vp, &vp->v_label, newlabel); -} - void mac_create_ifnet(struct ifnet *ifnet) { @@ -2229,13 +405,6 @@ mac_create_socket(struct ucred *cred, struct socket *socket) MAC_PERFORM(create_socket, cred, socket, &socket->so_label); } -void -mac_create_pipe(struct ucred *cred, struct pipe *pipe) -{ - - MAC_PERFORM(create_pipe, cred, pipe, pipe->pipe_label); -} - void mac_create_socket_from_socket(struct socket *oldsocket, struct socket *newsocket) @@ -2253,13 +422,6 @@ mac_relabel_socket(struct ucred *cred, struct socket *socket, MAC_PERFORM(relabel_socket, cred, socket, &socket->so_label, newlabel); } -static void -mac_relabel_pipe(struct ucred *cred, struct pipe *pipe, struct label *newlabel) -{ - - MAC_PERFORM(relabel_pipe, cred, pipe, pipe->pipe_label, newlabel); -} - void mac_set_socket_peer_from_mbuf(struct mbuf *mbuf, struct socket *socket) { @@ -2438,22 +600,6 @@ mac_create_mbuf_from_socket(struct socket *socket, struct mbuf *mbuf) label); } -void -mac_create_mount(struct ucred *cred, struct mount *mp) -{ - - MAC_PERFORM(create_mount, cred, mp, &mp->mnt_mntlabel, - &mp->mnt_fslabel); -} - -void -mac_create_root_mount(struct ucred *cred, struct mount *mp) -{ - - MAC_PERFORM(create_root_mount, cred, mp, &mp->mnt_mntlabel, - &mp->mnt_fslabel); -} - int mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) { @@ -2468,29 +614,6 @@ mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet) return (error); } -static int -mac_check_cred_relabel(struct ucred *cred, struct label *newlabel) -{ - int error; - - MAC_CHECK(check_cred_relabel, cred, newlabel); - - return (error); -} - -int -mac_check_cred_visible(struct ucred *u1, struct ucred *u2) -{ - int error; - - if (!mac_enforce_process) - return (0); - - MAC_CHECK(check_cred_visible, u1, u2); - - return (error); -} - int mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) { @@ -2510,249 +633,6 @@ mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf) return (error); } -int -mac_check_kenv_dump(struct ucred *cred) -{ - int error; - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_kenv_dump, cred); - - return (error); -} - -int -mac_check_kenv_get(struct ucred *cred, char *name) -{ - int error; - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_kenv_get, cred, name); - - return (error); -} - -int -mac_check_kenv_set(struct ucred *cred, char *name, char *value) -{ - int error; - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_kenv_set, cred, name, value); - - return (error); -} - -int -mac_check_kenv_unset(struct ucred *cred, char *name) -{ - int error; - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_kenv_unset, cred, name); - - return (error); -} - -int -mac_check_kld_load(struct ucred *cred, struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_kld_load"); - - if (!mac_enforce_kld) - return (0); - - MAC_CHECK(check_kld_load, cred, vp, &vp->v_label); - - return (error); -} - -int -mac_check_kld_stat(struct ucred *cred) -{ - int error; - - if (!mac_enforce_kld) - return (0); - - MAC_CHECK(check_kld_stat, cred); - - return (error); -} - -int -mac_check_kld_unload(struct ucred *cred) -{ - int error; - - if (!mac_enforce_kld) - return (0); - - MAC_CHECK(check_kld_unload, cred); - - return (error); -} - -int -mac_check_mount_stat(struct ucred *cred, struct mount *mount) -{ - int error; - - if (!mac_enforce_fs) - return (0); - - MAC_CHECK(check_mount_stat, cred, mount, &mount->mnt_mntlabel); - - return (error); -} - -int -mac_check_pipe_ioctl(struct ucred *cred, struct pipe *pipe, unsigned long cmd, - void *data) -{ - int error; - - PIPE_LOCK_ASSERT(pipe, MA_OWNED); - - if (!mac_enforce_pipe) - return (0); - - MAC_CHECK(check_pipe_ioctl, cred, pipe, pipe->pipe_label, cmd, data); - - return (error); -} - -int -mac_check_pipe_poll(struct ucred *cred, struct pipe *pipe) -{ - int error; - - PIPE_LOCK_ASSERT(pipe, MA_OWNED); - - if (!mac_enforce_pipe) - return (0); - - MAC_CHECK(check_pipe_poll, cred, pipe, pipe->pipe_label); - - return (error); -} - -int -mac_check_pipe_read(struct ucred *cred, struct pipe *pipe) -{ - int error; - - PIPE_LOCK_ASSERT(pipe, MA_OWNED); - - if (!mac_enforce_pipe) - return (0); - - MAC_CHECK(check_pipe_read, cred, pipe, pipe->pipe_label); - - return (error); -} - -static int -mac_check_pipe_relabel(struct ucred *cred, struct pipe *pipe, - struct label *newlabel) -{ - int error; - - PIPE_LOCK_ASSERT(pipe, MA_OWNED); - - if (!mac_enforce_pipe) - return (0); - - MAC_CHECK(check_pipe_relabel, cred, pipe, pipe->pipe_label, newlabel); - - return (error); -} - -int -mac_check_pipe_stat(struct ucred *cred, struct pipe *pipe) -{ - int error; - - PIPE_LOCK_ASSERT(pipe, MA_OWNED); - - if (!mac_enforce_pipe) - return (0); - - MAC_CHECK(check_pipe_stat, cred, pipe, pipe->pipe_label); - - return (error); -} - -int -mac_check_pipe_write(struct ucred *cred, struct pipe *pipe) -{ - int error; - - PIPE_LOCK_ASSERT(pipe, MA_OWNED); - - if (!mac_enforce_pipe) - return (0); - - MAC_CHECK(check_pipe_write, cred, pipe, pipe->pipe_label); - - return (error); -} - -int -mac_check_proc_debug(struct ucred *cred, struct proc *proc) -{ - int error; - - PROC_LOCK_ASSERT(proc, MA_OWNED); - - if (!mac_enforce_process) - return (0); - - MAC_CHECK(check_proc_debug, cred, proc); - - return (error); -} - -int -mac_check_proc_sched(struct ucred *cred, struct proc *proc) -{ - int error; - - PROC_LOCK_ASSERT(proc, MA_OWNED); - - if (!mac_enforce_process) - return (0); - - MAC_CHECK(check_proc_sched, cred, proc); - - return (error); -} - -int -mac_check_proc_signal(struct ucred *cred, struct proc *proc, int signum) -{ - int error; - - PROC_LOCK_ASSERT(proc, MA_OWNED); - - if (!mac_enforce_process) - return (0); - - MAC_CHECK(check_proc_signal, cred, proc, signum); - - return (error); -} - int mac_check_socket_bind(struct ucred *ucred, struct socket *socket, struct sockaddr *sockaddr) @@ -2863,122 +743,6 @@ mac_check_socket_visible(struct ucred *cred, struct socket *socket) return (error); } -int -mac_check_sysarch_ioperm(struct ucred *cred) -{ - int error; - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_sysarch_ioperm, cred); - return (error); -} - -int -mac_check_system_acct(struct ucred *cred, struct vnode *vp) -{ - int error; - - if (vp != NULL) { - ASSERT_VOP_LOCKED(vp, "mac_check_system_acct"); - } - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_system_acct, cred, vp, - vp != NULL ? &vp->v_label : NULL); - - return (error); -} - -int -mac_check_system_nfsd(struct ucred *cred) -{ - int error; - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_system_nfsd, cred); - - return (error); -} - -int -mac_check_system_reboot(struct ucred *cred, int howto) -{ - int error; - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_system_reboot, cred, howto); - - return (error); -} - -int -mac_check_system_settime(struct ucred *cred) -{ - int error; - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_system_settime, cred); - - return (error); -} - -int -mac_check_system_swapon(struct ucred *cred, struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_system_swapon"); - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_system_swapon, cred, vp, &vp->v_label); - return (error); -} - -int -mac_check_system_swapoff(struct ucred *cred, struct vnode *vp) -{ - int error; - - ASSERT_VOP_LOCKED(vp, "mac_check_system_swapoff"); - - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_system_swapoff, cred, vp, &vp->v_label); - return (error); -} - -int -mac_check_system_sysctl(struct ucred *cred, int *name, u_int namelen, - void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen) -{ - int error; - - /* - * XXXMAC: We're very much like to assert the SYSCTL_LOCK here, - * but since it's not exported from kern_sysctl.c, we can't. - */ - if (!mac_enforce_system) - return (0); - - MAC_CHECK(check_system_sysctl, cred, name, namelen, old, oldlenp, - inkernel, new, newlen); - - return (error); -} - int mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr, struct ifnet *ifnet) @@ -3070,31 +834,6 @@ mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, return (0); } -void -mac_create_devfs_device(struct mount *mp, dev_t dev, struct devfs_dirent *de) -{ - - MAC_PERFORM(create_devfs_device, mp, dev, de, &de->de_label); -} - -void -mac_create_devfs_symlink(struct ucred *cred, struct mount *mp, - struct devfs_dirent *dd, struct devfs_dirent *de) -{ - - MAC_PERFORM(create_devfs_symlink, cred, mp, dd, &dd->de_label, de, - &de->de_label); -} - -void -mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen, - struct devfs_dirent *de) -{ - - MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de, - &de->de_label); -} - int mac_setsockopt_label_set(struct ucred *cred, struct socket *so, struct mac *mac) @@ -3134,22 +873,6 @@ mac_setsockopt_label_set(struct ucred *cred, struct socket *so, return (0); } -int -mac_pipe_label_set(struct ucred *cred, struct pipe *pipe, struct label *label) -{ - int error; - - PIPE_LOCK_ASSERT(pipe, MA_OWNED); - - error = mac_check_pipe_relabel(cred, pipe, label); - if (error) - return (error); - - mac_relabel_pipe(cred, pipe, label); - - return (0); -} - int mac_getsockopt_label_get(struct ucred *cred, struct socket *so, struct mac *mac) @@ -3209,750 +932,3 @@ mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so, return (error); } - -/* - * Implementation of VOP_SETLABEL() that relies on extended attributes - * to store label data. Can be referenced by filesystems supporting - * extended attributes. - */ -int -vop_stdsetlabel_ea(struct vop_setlabel_args *ap) -{ - struct vnode *vp = ap->a_vp; - struct label *intlabel = ap->a_label; - int error; - - ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); - - if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) - return (EOPNOTSUPP); - - error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel); - if (error) - return (error); - - mac_relabel_vnode(ap->a_cred, vp, intlabel); - - return (0); -} - -static int -vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) -{ - int error; - - if (vp->v_mount == NULL) { - /* printf("vn_setlabel: null v_mount\n"); */ - if (vp->v_type != VNON) - printf("vn_setlabel: null v_mount with non-VNON\n"); - return (EBADF); - } - - if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) - return (EOPNOTSUPP); - - /* - * Multi-phase commit. First check the policies to confirm the - * change is OK. Then commit via the filesystem. Finally, - * update the actual vnode label. Question: maybe the filesystem - * should update the vnode at the end as part of VOP_SETLABEL()? - */ - error = mac_check_vnode_relabel(cred, vp, intlabel); - if (error) - return (error); - - /* - * VADMIN provides the opportunity for the filesystem to make - * decisions about who is and is not able to modify labels - * and protections on files. This might not be right. We can't - * assume VOP_SETLABEL() will do it, because we might implement - * that as part of vop_stdsetlabel_ea(). - */ - error = VOP_ACCESS(vp, VADMIN, cred, curthread); - if (error) - return (error); - - error = VOP_SETLABEL(vp, intlabel, cred, curthread); - if (error) - return (error); - - return (0); -} - -int -__mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap) -{ - char *elements, *buffer; - struct mac mac; - struct proc *tproc; - struct ucred *tcred; - int error; - - error = copyin(uap->mac_p, &mac, sizeof(mac)); - if (error) - return (error); - - error = mac_check_structmac_consistent(&mac); - if (error) - return (error); - - tproc = pfind(uap->pid); - if (tproc == NULL) - return (ESRCH); - - tcred = NULL; /* Satisfy gcc. */ - error = p_cansee(td, tproc); - if (error == 0) - tcred = crhold(tproc->p_ucred); - PROC_UNLOCK(tproc); - if (error) - return (error); - - elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); - error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); - if (error) { - free(elements, M_MACTEMP); - crfree(tcred); - return (error); - } - - buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); - error = mac_externalize_cred_label(&tcred->cr_label, elements, - buffer, mac.m_buflen, M_WAITOK); - if (error == 0) - error = copyout(buffer, mac.m_string, strlen(buffer)+1); - - free(buffer, M_MACTEMP); - free(elements, M_MACTEMP); - crfree(tcred); - return (error); -} - -/* - * MPSAFE - */ -int -__mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap) -{ - char *elements, *buffer; - struct mac mac; - int error; - - error = copyin(uap->mac_p, &mac, sizeof(mac)); - if (error) - return (error); - - error = mac_check_structmac_consistent(&mac); - if (error) - return (error); - - elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); - error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); - if (error) { - free(elements, M_MACTEMP); - return (error); - } - - buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); - error = mac_externalize_cred_label(&td->td_ucred->cr_label, - elements, buffer, mac.m_buflen, M_WAITOK); - if (error == 0) - error = copyout(buffer, mac.m_string, strlen(buffer)+1); - - free(buffer, M_MACTEMP); - free(elements, M_MACTEMP); - return (error); -} - -/* - * MPSAFE - */ -int -__mac_set_proc(struct thread *td, struct __mac_set_proc_args *uap) -{ - struct ucred *newcred, *oldcred; - struct label intlabel; - struct proc *p; - struct mac mac; - char *buffer; - int error; - - 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); - } - - mac_init_cred_label(&intlabel); - error = mac_internalize_cred_label(&intlabel, buffer); - free(buffer, M_MACTEMP); - if (error) { - mac_destroy_cred_label(&intlabel); - return (error); - } - - newcred = crget(); - - p = td->td_proc; - PROC_LOCK(p); - oldcred = p->p_ucred; - - error = mac_check_cred_relabel(oldcred, &intlabel); - if (error) { - PROC_UNLOCK(p); - crfree(newcred); - goto out; - } - - setsugid(p); - crcopy(newcred, oldcred); - mac_relabel_cred(newcred, &intlabel); - p->p_ucred = newcred; - - /* - * Grab additional reference for use while revoking mmaps, prior - * to releasing the proc lock and sharing the cred. - */ - crhold(newcred); - PROC_UNLOCK(p); - - if (mac_enforce_vm) { - mtx_lock(&Giant); - mac_cred_mmapped_drop_perms(td, newcred); - mtx_unlock(&Giant); - } - - crfree(newcred); /* Free revocation reference. */ - crfree(oldcred); - -out: - mac_destroy_cred_label(&intlabel); - return (error); -} - -/* - * MPSAFE - */ -int -__mac_get_fd(struct thread *td, struct __mac_get_fd_args *uap) -{ - char *elements, *buffer; - struct label intlabel; - struct file *fp; - struct mac mac; - struct vnode *vp; - struct pipe *pipe; - short label_type; - int error; - - error = copyin(uap->mac_p, &mac, sizeof(mac)); - if (error) - return (error); - - error = mac_check_structmac_consistent(&mac); - if (error) - return (error); - - elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); - error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); - if (error) { - free(elements, M_MACTEMP); - return (error); - } - - buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); - mtx_lock(&Giant); /* VFS */ - error = fget(td, uap->fd, &fp); - if (error) - goto out; - - label_type = fp->f_type; - switch (fp->f_type) { - case DTYPE_FIFO: - case DTYPE_VNODE: - vp = fp->f_vnode; - - mac_init_vnode_label(&intlabel); - - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); - mac_copy_vnode_label(&vp->v_label, &intlabel); - VOP_UNLOCK(vp, 0, td); - - break; - case DTYPE_PIPE: - pipe = fp->f_data; - - mac_init_pipe_label(&intlabel); - - PIPE_LOCK(pipe); - mac_copy_pipe_label(pipe->pipe_label, &intlabel); - PIPE_UNLOCK(pipe); - break; - default: - error = EINVAL; - fdrop(fp, td); - goto out; - } - fdrop(fp, td); - - switch (label_type) { - case DTYPE_FIFO: - case DTYPE_VNODE: - if (error == 0) - error = mac_externalize_vnode_label(&intlabel, - elements, buffer, mac.m_buflen, M_WAITOK); - mac_destroy_vnode_label(&intlabel); - break; - case DTYPE_PIPE: - error = mac_externalize_pipe_label(&intlabel, elements, - buffer, mac.m_buflen, M_WAITOK); - mac_destroy_pipe_label(&intlabel); - break; - default: - panic("__mac_get_fd: corrupted label_type"); - } - - if (error == 0) - error = copyout(buffer, mac.m_string, strlen(buffer)+1); - -out: - mtx_unlock(&Giant); /* VFS */ - free(buffer, M_MACTEMP); - free(elements, M_MACTEMP); - - return (error); -} - -/* - * MPSAFE - */ -int -__mac_get_file(struct thread *td, struct __mac_get_file_args *uap) -{ - char *elements, *buffer; - struct nameidata nd; - struct label intlabel; - struct mac mac; - int error; - - error = copyin(uap->mac_p, &mac, sizeof(mac)); - if (error) - return (error); - - error = mac_check_structmac_consistent(&mac); - if (error) - return (error); - - elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); - error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); - if (error) { - free(elements, M_MACTEMP); - return (error); - } - - buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); - mtx_lock(&Giant); /* VFS */ - NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, - td); - error = namei(&nd); - if (error) - goto out; - - mac_init_vnode_label(&intlabel); - mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); - error = mac_externalize_vnode_label(&intlabel, elements, buffer, - mac.m_buflen, M_WAITOK); - - NDFREE(&nd, 0); - mac_destroy_vnode_label(&intlabel); - - if (error == 0) - error = copyout(buffer, mac.m_string, strlen(buffer)+1); - -out: - mtx_unlock(&Giant); /* VFS */ - - free(buffer, M_MACTEMP); - free(elements, M_MACTEMP); - - return (error); -} - -/* - * MPSAFE - */ -int -__mac_get_link(struct thread *td, struct __mac_get_link_args *uap) -{ - char *elements, *buffer; - struct nameidata nd; - struct label intlabel; - struct mac mac; - int error; - - error = copyin(uap->mac_p, &mac, sizeof(mac)); - if (error) - return (error); - - error = mac_check_structmac_consistent(&mac); - if (error) - return (error); - - elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK); - error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL); - if (error) { - free(elements, M_MACTEMP); - return (error); - } - - buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO); - mtx_lock(&Giant); /* VFS */ - NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, - td); - error = namei(&nd); - if (error) - goto out; - - mac_init_vnode_label(&intlabel); - mac_copy_vnode_label(&nd.ni_vp->v_label, &intlabel); - error = mac_externalize_vnode_label(&intlabel, elements, buffer, - mac.m_buflen, M_WAITOK); - NDFREE(&nd, 0); - mac_destroy_vnode_label(&intlabel); - - if (error == 0) - error = copyout(buffer, mac.m_string, strlen(buffer)+1); - -out: - mtx_unlock(&Giant); /* VFS */ - - free(buffer, M_MACTEMP); - free(elements, M_MACTEMP); - - return (error); -} - -/* - * MPSAFE - */ -int -__mac_set_fd(struct thread *td, struct __mac_set_fd_args *uap) -{ - struct label intlabel; - struct pipe *pipe; - struct file *fp; - struct mount *mp; - struct vnode *vp; - struct mac mac; - char *buffer; - int error; - - 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); - } - - mtx_lock(&Giant); /* VFS */ - - error = fget(td, uap->fd, &fp); - if (error) - goto out; - - switch (fp->f_type) { - case DTYPE_FIFO: - case DTYPE_VNODE: - mac_init_vnode_label(&intlabel); - error = mac_internalize_vnode_label(&intlabel, buffer); - if (error) { - mac_destroy_vnode_label(&intlabel); - break; - } - - vp = fp->f_vnode; - error = vn_start_write(vp, &mp, V_WAIT | PCATCH); - if (error != 0) { - mac_destroy_vnode_label(&intlabel); - break; - } - - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); - error = vn_setlabel(vp, &intlabel, td->td_ucred); - VOP_UNLOCK(vp, 0, td); - vn_finished_write(mp); - - mac_destroy_vnode_label(&intlabel); - break; - - case DTYPE_PIPE: - mac_init_pipe_label(&intlabel); - error = mac_internalize_pipe_label(&intlabel, buffer); - if (error == 0) { - pipe = fp->f_data; - PIPE_LOCK(pipe); - error = mac_pipe_label_set(td->td_ucred, pipe, - &intlabel); - PIPE_UNLOCK(pipe); - } - - mac_destroy_pipe_label(&intlabel); - break; - - default: - error = EINVAL; - } - - fdrop(fp, td); -out: - mtx_unlock(&Giant); /* VFS */ - - free(buffer, M_MACTEMP); - - return (error); -} - -/* - * MPSAFE - */ -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 error; - - 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); - } - - mac_init_vnode_label(&intlabel); - error = mac_internalize_vnode_label(&intlabel, buffer); - free(buffer, M_MACTEMP); - if (error) { - mac_destroy_vnode_label(&intlabel); - return (error); - } - - mtx_lock(&Giant); /* VFS */ - - NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_USERSPACE, uap->path_p, - td); - error = namei(&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); - mtx_unlock(&Giant); /* VFS */ - mac_destroy_vnode_label(&intlabel); - - return (error); -} - -/* - * MPSAFE - */ -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 error; - - 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); - } - - mac_init_vnode_label(&intlabel); - error = mac_internalize_vnode_label(&intlabel, buffer); - free(buffer, M_MACTEMP); - if (error) { - mac_destroy_vnode_label(&intlabel); - return (error); - } - - mtx_lock(&Giant); /* VFS */ - - NDINIT(&nd, LOOKUP, LOCKLEAF | NOFOLLOW, UIO_USERSPACE, uap->path_p, - td); - error = namei(&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); - mtx_unlock(&Giant); /* VFS */ - mac_destroy_vnode_label(&intlabel); - - return (error); -} - -/* - * MPSAFE - */ -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); -} - -SYSINIT(mac, SI_SUB_MAC, SI_ORDER_FIRST, mac_init, NULL); -SYSINIT(mac_late, SI_SUB_MAC_LATE, SI_ORDER_FIRST, mac_late_init, NULL); - -#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