/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2015 Nexenta Systems, Inc. All rights reserved. * Copyright (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static struct kmem_cache *exi_cache_handle; static void exi_cache_reclaim(void *); static void exi_cache_trim(struct exportinfo *exi); extern pri_t minclsyspri; volatile uint_t nfsauth_cache_hit; volatile uint_t nfsauth_cache_miss; volatile uint_t nfsauth_cache_refresh; volatile uint_t nfsauth_cache_reclaim; /* * The lifetime of an auth cache entry: * ------------------------------------ * * An auth cache entry is created with both the auth_time * and auth_freshness times set to the current time. * * Upon every client access which results in a hit, the * auth_time will be updated. * * If a client access determines that the auth_freshness * indicates that the entry is STALE, then it will be * refreshed. Note that this will explicitly reset * auth_time. * * When the REFRESH successfully occurs, then the * auth_freshness is updated. * * There are two ways for an entry to leave the cache: * * 1) Purged by an action on the export (remove or changed) * 2) Memory backpressure from the kernel (check against NFSAUTH_CACHE_TRIM) * * For 2) we check the timeout value against auth_time. */ /* * Number of seconds until we mark for refresh an auth cache entry. */ #define NFSAUTH_CACHE_REFRESH 600 /* * Number of idle seconds until we yield to backpressure * to trim a cache entry. */ #define NFSAUTH_CACHE_TRIM 3600 /* * While we could encapuslate the exi_list inside the * exi structure, we can't do that for the auth_list. * So, to keep things looking clean, we keep them both * in these external lists. */ typedef struct refreshq_exi_node { struct exportinfo *ren_exi; list_t ren_authlist; list_node_t ren_node; } refreshq_exi_node_t; typedef struct refreshq_auth_node { struct auth_cache *ran_auth; char *ran_netid; list_node_t ran_node; } refreshq_auth_node_t; /* * Used to manipulate things on the refreshq_queue. * Note that the refresh thread will effectively * pop a node off of the queue, at which point it * will no longer need to hold the mutex. */ static kmutex_t refreshq_lock; static list_t refreshq_queue; static kcondvar_t refreshq_cv; /* * If there is ever a problem with loading the * module, then nfsauth_fini() needs to be called * to remove state. In that event, since the * refreshq thread has been started, they need to * work together to get rid of state. */ typedef enum nfsauth_refreshq_thread_state { REFRESHQ_THREAD_RUNNING, REFRESHQ_THREAD_FINI_REQ, REFRESHQ_THREAD_HALTED } nfsauth_refreshq_thread_state_t; nfsauth_refreshq_thread_state_t refreshq_thread_state = REFRESHQ_THREAD_HALTED; static void nfsauth_free_node(struct auth_cache *); static void nfsauth_refresh_thread(void); static int nfsauth_cache_compar(const void *, const void *); /* * mountd is a server-side only daemon. This will need to be * revisited if the NFS server is ever made zones-aware. */ kmutex_t mountd_lock; door_handle_t mountd_dh; void mountd_args(uint_t did) { mutex_enter(&mountd_lock); if (mountd_dh != NULL) door_ki_rele(mountd_dh); mountd_dh = door_ki_lookup(did); mutex_exit(&mountd_lock); } void nfsauth_init(void) { /* * mountd can be restarted by smf(5). We need to make sure * the updated door handle will safely make it to mountd_dh */ mutex_init(&mountd_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&refreshq_lock, NULL, MUTEX_DEFAULT, NULL); list_create(&refreshq_queue, sizeof (refreshq_exi_node_t), offsetof(refreshq_exi_node_t, ren_node)); cv_init(&refreshq_cv, NULL, CV_DEFAULT, NULL); /* * Allocate nfsauth cache handle */ exi_cache_handle = kmem_cache_create("exi_cache_handle", sizeof (struct auth_cache), 0, NULL, NULL, exi_cache_reclaim, NULL, NULL, 0); refreshq_thread_state = REFRESHQ_THREAD_RUNNING; (void) zthread_create(NULL, 0, nfsauth_refresh_thread, NULL, 0, minclsyspri); } /* * Finalization routine for nfsauth. It is important to call this routine * before destroying the exported_lock. */ void nfsauth_fini(void) { refreshq_exi_node_t *ren; /* * Prevent the nfsauth_refresh_thread from getting new * work. */ mutex_enter(&refreshq_lock); if (refreshq_thread_state != REFRESHQ_THREAD_HALTED) { refreshq_thread_state = REFRESHQ_THREAD_FINI_REQ; cv_broadcast(&refreshq_cv); /* * Also, wait for nfsauth_refresh_thread() to exit. */ while (refreshq_thread_state != REFRESHQ_THREAD_HALTED) { cv_wait(&refreshq_cv, &refreshq_lock); } } mutex_exit(&refreshq_lock); /* * Walk the exi_list and in turn, walk the auth_lists and free all * lists. In addition, free INVALID auth_cache entries. */ while ((ren = list_remove_head(&refreshq_queue))) { refreshq_auth_node_t *ran; while ((ran = list_remove_head(&ren->ren_authlist)) != NULL) { struct auth_cache *p = ran->ran_auth; if (p->auth_state == NFS_AUTH_INVALID) nfsauth_free_node(p); strfree(ran->ran_netid); kmem_free(ran, sizeof (refreshq_auth_node_t)); } list_destroy(&ren->ren_authlist); exi_rele(ren->ren_exi); kmem_free(ren, sizeof (refreshq_exi_node_t)); } list_destroy(&refreshq_queue); cv_destroy(&refreshq_cv); mutex_destroy(&refreshq_lock); mutex_destroy(&mountd_lock); /* * Deallocate nfsauth cache handle */ kmem_cache_destroy(exi_cache_handle); } /* * Convert the address in a netbuf to * a hash index for the auth_cache table. */ static int hash(struct netbuf *a) { int i, h = 0; for (i = 0; i < a->len; i++) h ^= a->buf[i]; return (h & (AUTH_TABLESIZE - 1)); } /* * Mask out the components of an * address that do not identify * a host. For socket addresses the * masking gets rid of the port number. */ static void addrmask(struct netbuf *addr, struct netbuf *mask) { int i; for (i = 0; i < addr->len; i++) addr->buf[i] &= mask->buf[i]; } /* * nfsauth4_access is used for NFS V4 auth checking. Besides doing * the common nfsauth_access(), it will check if the client can * have a limited access to this vnode even if the security flavor * used does not meet the policy. */ int nfsauth4_access(struct exportinfo *exi, vnode_t *vp, struct svc_req *req, cred_t *cr, uid_t *uid, gid_t *gid, uint_t *ngids, gid_t **gids) { int access; rw_enter(&exported_lock, RW_READER); access = nfsauth_access(exi, req, cr, uid, gid, ngids, gids); rw_exit(&exported_lock); /* * There are cases that the server needs to allow the client * to have a limited view. * * e.g. * /export is shared as "sec=sys,rw=dfs-test-4,sec=krb5,rw" * /export/home is shared as "sec=sys,rw" * * When the client mounts /export with sec=sys, the client * would get a limited view with RO access on /export to see * "home" only because the client is allowed to access * /export/home with auth_sys. */ if (access & NFSAUTH_DENIED || access & NFSAUTH_WRONGSEC) { /* * Allow ro permission with LIMITED view if there is a * sub-dir exported under vp. */ if (has_visible(exi, vp)) return (NFSAUTH_LIMITED); } return (access); } static void sys_log(const char *msg) { static time_t tstamp = 0; time_t now; /* * msg is shown (at most) once per minute */ now = gethrestime_sec(); if ((tstamp + 60) < now) { tstamp = now; cmn_err(CE_WARN, msg); } } /* * Callup to the mountd to get access information in the kernel. */ static bool_t nfsauth_retrieve(struct exportinfo *exi, char *req_netid, int flavor, struct netbuf *addr, int *access, uid_t clnt_uid, gid_t clnt_gid, uint_t clnt_gids_cnt, const gid_t *clnt_gids, uid_t *srv_uid, gid_t *srv_gid, uint_t *srv_gids_cnt, gid_t **srv_gids) { varg_t varg = {0}; nfsauth_res_t res = {0}; XDR xdrs; size_t absz; caddr_t abuf; int last = 0; door_arg_t da; door_info_t di; door_handle_t dh; uint_t ntries = 0; /* * No entry in the cache for this client/flavor * so we need to call the nfsauth service in the * mount daemon. */ varg.vers = V_PROTO; varg.arg_u.arg.cmd = NFSAUTH_ACCESS; varg.arg_u.arg.areq.req_client.n_len = addr->len; varg.arg_u.arg.areq.req_client.n_bytes = addr->buf; varg.arg_u.arg.areq.req_netid = req_netid; varg.arg_u.arg.areq.req_path = exi->exi_export.ex_path; varg.arg_u.arg.areq.req_flavor = flavor; varg.arg_u.arg.areq.req_clnt_uid = clnt_uid; varg.arg_u.arg.areq.req_clnt_gid = clnt_gid; varg.arg_u.arg.areq.req_clnt_gids.len = clnt_gids_cnt; varg.arg_u.arg.areq.req_clnt_gids.val = (gid_t *)clnt_gids; DTRACE_PROBE1(nfsserv__func__nfsauth__varg, varg_t *, &varg); /* * Setup the XDR stream for encoding the arguments. Notice that * in addition to the args having variable fields (req_netid and * req_path), the argument data structure is itself versioned, * so we need to make sure we can size the arguments buffer * appropriately to encode all the args. If we can't get sizing * info _or_ properly encode the arguments, there's really no * point in continuting, so we fail the request. */ if ((absz = xdr_sizeof(xdr_varg, &varg)) == 0) { *access = NFSAUTH_DENIED; return (FALSE); } abuf = (caddr_t)kmem_alloc(absz, KM_SLEEP); xdrmem_create(&xdrs, abuf, absz, XDR_ENCODE); if (!xdr_varg(&xdrs, &varg)) { XDR_DESTROY(&xdrs); goto fail; } XDR_DESTROY(&xdrs); /* * Prepare the door arguments * * We don't know the size of the message the daemon * will pass back to us. By setting rbuf to NULL, * we force the door code to allocate a buf of the * appropriate size. We must set rsize > 0, however, * else the door code acts as if no response was * expected and doesn't pass the data to us. */ da.data_ptr = (char *)abuf; da.data_size = absz; da.desc_ptr = NULL; da.desc_num = 0; da.rbuf = NULL; da.rsize = 1; retry: mutex_enter(&mountd_lock); dh = mountd_dh; if (dh != NULL) door_ki_hold(dh); mutex_exit(&mountd_lock); if (dh == NULL) { /* * The rendezvous point has not been established yet! * This could mean that either mountd(1m) has not yet * been started or that _this_ routine nuked the door * handle after receiving an EINTR for a REVOKED door. * * Returning NFSAUTH_DROP will cause the NFS client * to retransmit the request, so let's try to be more * rescillient and attempt for ntries before we bail. */ if (++ntries % NFSAUTH_DR_TRYCNT) { delay(hz); goto retry; } kmem_free(abuf, absz); sys_log("nfsauth: mountd has not established door"); *access = NFSAUTH_DROP; return (FALSE); } ntries = 0; /* * Now that we've got what we need, place the call. */ switch (door_ki_upcall_limited(dh, &da, NULL, SIZE_MAX, 0)) { case 0: /* Success */ door_ki_rele(dh); if (da.data_ptr == NULL && da.data_size == 0) { /* * The door_return that contained the data * failed! We're here because of the 2nd * door_return (w/o data) such that we can * get control of the thread (and exit * gracefully). */ DTRACE_PROBE1(nfsserv__func__nfsauth__door__nil, door_arg_t *, &da); goto fail; } break; case EAGAIN: /* * Server out of resources; back off for a bit */ door_ki_rele(dh); delay(hz); goto retry; /* NOTREACHED */ case EINTR: if (!door_ki_info(dh, &di)) { door_ki_rele(dh); if (di.di_attributes & DOOR_REVOKED) { /* * The server barfed and revoked * the (existing) door on us; we * want to wait to give smf(5) a * chance to restart mountd(1m) * and establish a new door handle. */ mutex_enter(&mountd_lock); if (dh == mountd_dh) { door_ki_rele(mountd_dh); mountd_dh = NULL; } mutex_exit(&mountd_lock); delay(hz); goto retry; } /* * If the door was _not_ revoked on us, * then more than likely we took an INTR, * so we need to fail the operation. */ goto fail; } /* * The only failure that can occur from getting * the door info is EINVAL, so we let the code * below handle it. */ /* FALLTHROUGH */ case EBADF: case EINVAL: default: /* * If we have a stale door handle, give smf a last * chance to start it by sleeping for a little bit. * If we're still hosed, we'll fail the call. * * Since we're going to reacquire the door handle * upon the retry, we opt to sleep for a bit and * _not_ to clear mountd_dh. If mountd restarted * and was able to set mountd_dh, we should see * the new instance; if not, we won't get caught * up in the retry/DELAY loop. */ door_ki_rele(dh); if (!last) { delay(hz); last++; goto retry; } sys_log("nfsauth: stale mountd door handle"); goto fail; } ASSERT(da.rbuf != NULL); /* * No door errors encountered; setup the XDR stream for decoding * the results. If we fail to decode the results, we've got no * other recourse than to fail the request. */ xdrmem_create(&xdrs, da.rbuf, da.rsize, XDR_DECODE); if (!xdr_nfsauth_res(&xdrs, &res)) { xdr_free(xdr_nfsauth_res, (char *)&res); XDR_DESTROY(&xdrs); kmem_free(da.rbuf, da.rsize); goto fail; } XDR_DESTROY(&xdrs); kmem_free(da.rbuf, da.rsize); DTRACE_PROBE1(nfsserv__func__nfsauth__results, nfsauth_res_t *, &res); switch (res.stat) { case NFSAUTH_DR_OKAY: *access = res.ares.auth_perm; *srv_uid = res.ares.auth_srv_uid; *srv_gid = res.ares.auth_srv_gid; *srv_gids_cnt = res.ares.auth_srv_gids.len; *srv_gids = kmem_alloc(*srv_gids_cnt * sizeof (gid_t), KM_SLEEP); bcopy(res.ares.auth_srv_gids.val, *srv_gids, *srv_gids_cnt * sizeof (gid_t)); break; case NFSAUTH_DR_EFAIL: case NFSAUTH_DR_DECERR: case NFSAUTH_DR_BADCMD: default: xdr_free(xdr_nfsauth_res, (char *)&res); fail: *access = NFSAUTH_DENIED; kmem_free(abuf, absz); return (FALSE); /* NOTREACHED */ } xdr_free(xdr_nfsauth_res, (char *)&res); kmem_free(abuf, absz); return (TRUE); } static void nfsauth_refresh_thread(void) { refreshq_exi_node_t *ren; refreshq_auth_node_t *ran; struct exportinfo *exi; int access; bool_t retrieval; callb_cpr_t cprinfo; CALLB_CPR_INIT(&cprinfo, &refreshq_lock, callb_generic_cpr, "nfsauth_refresh"); for (;;) { mutex_enter(&refreshq_lock); if (refreshq_thread_state != REFRESHQ_THREAD_RUNNING) { /* Keep the hold on the lock! */ break; } ren = list_remove_head(&refreshq_queue); if (ren == NULL) { CALLB_CPR_SAFE_BEGIN(&cprinfo); cv_wait(&refreshq_cv, &refreshq_lock); CALLB_CPR_SAFE_END(&cprinfo, &refreshq_lock); mutex_exit(&refreshq_lock); continue; } mutex_exit(&refreshq_lock); exi = ren->ren_exi; ASSERT(exi != NULL); /* * Since the ren was removed from the refreshq_queue above, * this is the only thread aware about the ren existence, so we * have the exclusive ownership of it and we do not need to * protect it by any lock. */ while ((ran = list_remove_head(&ren->ren_authlist))) { uid_t uid; gid_t gid; uint_t ngids; gid_t *gids; struct auth_cache *p = ran->ran_auth; char *netid = ran->ran_netid; ASSERT(p != NULL); ASSERT(netid != NULL); kmem_free(ran, sizeof (refreshq_auth_node_t)); mutex_enter(&p->auth_lock); /* * Once the entry goes INVALID, it can not change * state. * * No need to refresh entries also in a case we are * just shutting down. * * In general, there is no need to hold the * refreshq_lock to test the refreshq_thread_state. We * do hold it at other places because there is some * related thread synchronization (or some other tasks) * close to the refreshq_thread_state check. * * The check for the refreshq_thread_state value here * is purely advisory to allow the faster * nfsauth_refresh_thread() shutdown. In a case we * will miss such advisory, nothing catastrophic * happens: we will just spin longer here before the * shutdown. */ if (p->auth_state == NFS_AUTH_INVALID || refreshq_thread_state != REFRESHQ_THREAD_RUNNING) { mutex_exit(&p->auth_lock); if (p->auth_state == NFS_AUTH_INVALID) nfsauth_free_node(p); strfree(netid); continue; } /* * Make sure the state is valid. Note that once we * change the state to NFS_AUTH_REFRESHING, no other * thread will be able to work on this entry. */ ASSERT(p->auth_state == NFS_AUTH_STALE); p->auth_state = NFS_AUTH_REFRESHING; mutex_exit(&p->auth_lock); DTRACE_PROBE2(nfsauth__debug__cache__refresh, struct exportinfo *, exi, struct auth_cache *, p); /* * The first caching of the access rights * is done with the netid pulled out of the * request from the client. All subsequent * users of the cache may or may not have * the same netid. It doesn't matter. So * when we refresh, we simply use the netid * of the request which triggered the * refresh attempt. */ retrieval = nfsauth_retrieve(exi, netid, p->auth_flavor, &p->auth_clnt->authc_addr, &access, p->auth_clnt_uid, p->auth_clnt_gid, p->auth_clnt_ngids, p->auth_clnt_gids, &uid, &gid, &ngids, &gids); /* * This can only be set in one other place * and the state has to be NFS_AUTH_FRESH. */ strfree(netid); mutex_enter(&p->auth_lock); if (p->auth_state == NFS_AUTH_INVALID) { mutex_exit(&p->auth_lock); nfsauth_free_node(p); if (retrieval == TRUE) kmem_free(gids, ngids * sizeof (gid_t)); } else { /* * If we got an error, do not reset the * time. This will cause the next access * check for the client to reschedule this * node. */ if (retrieval == TRUE) { p->auth_access = access; p->auth_srv_uid = uid; p->auth_srv_gid = gid; kmem_free(p->auth_srv_gids, p->auth_srv_ngids * sizeof (gid_t)); p->auth_srv_ngids = ngids; p->auth_srv_gids = gids; p->auth_freshness = gethrestime_sec(); } p->auth_state = NFS_AUTH_FRESH; cv_broadcast(&p->auth_cv); mutex_exit(&p->auth_lock); } } list_destroy(&ren->ren_authlist); exi_rele(ren->ren_exi); kmem_free(ren, sizeof (refreshq_exi_node_t)); } refreshq_thread_state = REFRESHQ_THREAD_HALTED; cv_broadcast(&refreshq_cv); CALLB_CPR_EXIT(&cprinfo); zthread_exit(); } int nfsauth_cache_clnt_compar(const void *v1, const void *v2) { int c; const struct auth_cache_clnt *a1 = (const struct auth_cache_clnt *)v1; const struct auth_cache_clnt *a2 = (const struct auth_cache_clnt *)v2; if (a1->authc_addr.len < a2->authc_addr.len) return (-1); if (a1->authc_addr.len > a2->authc_addr.len) return (1); c = memcmp(a1->authc_addr.buf, a2->authc_addr.buf, a1->authc_addr.len); if (c < 0) return (-1); if (c > 0) return (1); return (0); } static int nfsauth_cache_compar(const void *v1, const void *v2) { const struct auth_cache *a1 = (const struct auth_cache *)v1; const struct auth_cache *a2 = (const struct auth_cache *)v2; if (a1->auth_flavor < a2->auth_flavor) return (-1); if (a1->auth_flavor > a2->auth_flavor) return (1); if (a1->auth_clnt_uid < a2->auth_clnt_uid) return (-1); if (a1->auth_clnt_uid > a2->auth_clnt_uid) return (1); if (a1->auth_clnt_gid < a2->auth_clnt_gid) return (-1); if (a1->auth_clnt_gid > a2->auth_clnt_gid) return (1); return (0); } /* * Get the access information from the cache or callup to the mountd * to get and cache the access information in the kernel. */ static int nfsauth_cache_get(struct exportinfo *exi, struct svc_req *req, int flavor, cred_t *cr, uid_t *uid, gid_t *gid, uint_t *ngids, gid_t **gids) { struct netbuf *taddrmask; struct netbuf addr; /* temporary copy of client's address */ const struct netbuf *claddr; avl_tree_t *tree; struct auth_cache ac; /* used as a template for avl_find() */ struct auth_cache_clnt *c; struct auth_cache_clnt acc; /* used as a template for avl_find() */ struct auth_cache *p = NULL; int access; uid_t tmpuid; gid_t tmpgid; uint_t tmpngids; gid_t *tmpgids; avl_index_t where; /* used for avl_find()/avl_insert() */ ASSERT(cr != NULL); /* * Now check whether this client already * has an entry for this flavor in the cache * for this export. * Get the caller's address, mask off the * parts of the address that do not identify * the host (port number, etc), and then hash * it to find the chain of cache entries. */ claddr = svc_getrpccaller(req->rq_xprt); addr = *claddr; addr.buf = kmem_alloc(addr.maxlen, KM_SLEEP); bcopy(claddr->buf, addr.buf, claddr->len); SVC_GETADDRMASK(req->rq_xprt, SVC_TATTR_ADDRMASK, (void **)&taddrmask); ASSERT(taddrmask != NULL); addrmask(&addr, taddrmask); ac.auth_flavor = flavor; ac.auth_clnt_uid = crgetuid(cr); ac.auth_clnt_gid = crgetgid(cr); acc.authc_addr = addr; tree = exi->exi_cache[hash(&addr)]; rw_enter(&exi->exi_cache_lock, RW_READER); c = (struct auth_cache_clnt *)avl_find(tree, &acc, NULL); if (c == NULL) { struct auth_cache_clnt *nc; rw_exit(&exi->exi_cache_lock); nc = kmem_alloc(sizeof (*nc), KM_NOSLEEP | KM_NORMALPRI); if (nc == NULL) goto retrieve; /* * Initialize the new auth_cache_clnt */ nc->authc_addr = addr; nc->authc_addr.buf = kmem_alloc(addr.maxlen, KM_NOSLEEP | KM_NORMALPRI); if (addr.maxlen != 0 && nc->authc_addr.buf == NULL) { kmem_free(nc, sizeof (*nc)); goto retrieve; } bcopy(addr.buf, nc->authc_addr.buf, addr.len); rw_init(&nc->authc_lock, NULL, RW_DEFAULT, NULL); avl_create(&nc->authc_tree, nfsauth_cache_compar, sizeof (struct auth_cache), offsetof(struct auth_cache, auth_link)); rw_enter(&exi->exi_cache_lock, RW_WRITER); c = (struct auth_cache_clnt *)avl_find(tree, &acc, &where); if (c == NULL) { avl_insert(tree, nc, where); rw_downgrade(&exi->exi_cache_lock); c = nc; } else { rw_downgrade(&exi->exi_cache_lock); avl_destroy(&nc->authc_tree); rw_destroy(&nc->authc_lock); kmem_free(nc->authc_addr.buf, nc->authc_addr.maxlen); kmem_free(nc, sizeof (*nc)); } } ASSERT(c != NULL); rw_enter(&c->authc_lock, RW_READER); p = (struct auth_cache *)avl_find(&c->authc_tree, &ac, NULL); if (p == NULL) { struct auth_cache *np; rw_exit(&c->authc_lock); np = kmem_cache_alloc(exi_cache_handle, KM_NOSLEEP | KM_NORMALPRI); if (np == NULL) { rw_exit(&exi->exi_cache_lock); goto retrieve; } /* * Initialize the new auth_cache */ np->auth_clnt = c; np->auth_flavor = flavor; np->auth_clnt_uid = crgetuid(cr); np->auth_clnt_gid = crgetgid(cr); np->auth_clnt_ngids = 0; np->auth_clnt_gids = NULL; np->auth_srv_ngids = 0; np->auth_srv_gids = NULL; np->auth_time = np->auth_freshness = gethrestime_sec(); np->auth_state = NFS_AUTH_NEW; mutex_init(&np->auth_lock, NULL, MUTEX_DEFAULT, NULL); cv_init(&np->auth_cv, NULL, CV_DEFAULT, NULL); rw_enter(&c->authc_lock, RW_WRITER); rw_exit(&exi->exi_cache_lock); p = (struct auth_cache *)avl_find(&c->authc_tree, &ac, &where); if (p == NULL) { avl_insert(&c->authc_tree, np, where); rw_downgrade(&c->authc_lock); p = np; } else { rw_downgrade(&c->authc_lock); cv_destroy(&np->auth_cv); mutex_destroy(&np->auth_lock); kmem_cache_free(exi_cache_handle, np); } } else { rw_exit(&exi->exi_cache_lock); } mutex_enter(&p->auth_lock); rw_exit(&c->authc_lock); wait: /* * If the entry is in the WAITING state then some other thread is just * retrieving the required info. The entry was either NEW, or the list * of client's supplemental groups is going to be changed (either by * this thread, or by some other thread). We need to wait until the * nfsauth_retrieve() is done. */ while (p->auth_state == NFS_AUTH_WAITING) cv_wait(&p->auth_cv, &p->auth_lock); /* * Here the entry cannot be in WAITING or INVALID state. */ ASSERT(p->auth_state != NFS_AUTH_WAITING); ASSERT(p->auth_state != NFS_AUTH_INVALID); /* * In a case the client's list of supplemental groups changed (or, the * list is not initialized yet) we need to (re)allocate it and make * sure the auth_cache entry is (re)retrieved. */ if (p->auth_clnt_ngids != crgetngroups(cr) || bcmp(p->auth_clnt_gids, crgetgroups(cr), p->auth_clnt_ngids * sizeof (gid_t)) != 0) { /* * If the refresh thread is just working on this entry then * wait for it so we do not modify the list of supplemental * groups in the middle of its processing. */ if (p->auth_state == NFS_AUTH_REFRESHING) { p->auth_state = NFS_AUTH_WAITING; goto wait; } /* * We won't modify (and use) the STALE entries here since they * are already in the refreshq_queue list. Such entries will * be updated later. */ if (p->auth_state == NFS_AUTH_STALE) { mutex_exit(&p->auth_lock); p = NULL; goto retrieve; } p->auth_state = NFS_AUTH_NEW; /* * If the number of supplemental groups differ, we need to * reallocate first. */ if (p->auth_clnt_ngids != crgetngroups(cr)) { kmem_free(p->auth_clnt_gids, p->auth_clnt_ngids * sizeof (gid_t)); p->auth_clnt_ngids = crgetngroups(cr); p->auth_clnt_gids = kmem_alloc( p->auth_clnt_ngids * sizeof (gid_t), KM_NOSLEEP | KM_NORMALPRI); /* * If we failed to preallocate the memory for * supplemental groups, we won't cache the retrieved * data. */ if (p->auth_clnt_ngids != 0 && p->auth_clnt_gids == NULL) { p->auth_clnt_ngids = 0; mutex_exit(&p->auth_lock); p = NULL; goto retrieve; } } /* * Fill the client's supplemental groups. */ bcopy(crgetgroups(cr), p->auth_clnt_gids, p->auth_clnt_ngids * sizeof (gid_t)); } /* * If the cache entry is not valid yet, we need to retrieve the * info ourselves. */ if (p->auth_state == NFS_AUTH_NEW) { bool_t res; /* * NFS_AUTH_NEW is the default output auth_state value in a * case we failed somewhere below. */ auth_state_t state = NFS_AUTH_NEW; p->auth_state = NFS_AUTH_WAITING; mutex_exit(&p->auth_lock); kmem_free(addr.buf, addr.maxlen); addr = p->auth_clnt->authc_addr; atomic_inc_uint(&nfsauth_cache_miss); res = nfsauth_retrieve(exi, svc_getnetid(req->rq_xprt), flavor, &addr, &access, crgetuid(cr), crgetgid(cr), crgetngroups(cr), crgetgroups(cr), &tmpuid, &tmpgid, &tmpngids, &tmpgids); p->auth_access = access; p->auth_time = p->auth_freshness = gethrestime_sec(); if (res == TRUE) { if (uid != NULL) *uid = tmpuid; if (gid != NULL) *gid = tmpgid; if (ngids != NULL && gids != NULL) { *ngids = tmpngids; *gids = tmpgids; /* * We need a copy of gids for the * auth_cache entry */ tmpgids = kmem_alloc(tmpngids * sizeof (gid_t), KM_NOSLEEP | KM_NORMALPRI); if (tmpgids != NULL) bcopy(*gids, tmpgids, tmpngids * sizeof (gid_t)); } if (tmpgids != NULL || tmpngids == 0) { p->auth_srv_uid = tmpuid; p->auth_srv_gid = tmpgid; p->auth_srv_ngids = tmpngids; p->auth_srv_gids = tmpgids; state = NFS_AUTH_FRESH; } } /* * Set the auth_state and notify waiters. */ mutex_enter(&p->auth_lock); p->auth_state = state; cv_broadcast(&p->auth_cv); mutex_exit(&p->auth_lock); } else { uint_t nach; time_t refresh; refresh = gethrestime_sec() - p->auth_freshness; p->auth_time = gethrestime_sec(); if (uid != NULL) *uid = p->auth_srv_uid; if (gid != NULL) *gid = p->auth_srv_gid; if (ngids != NULL && gids != NULL) { *ngids = p->auth_srv_ngids; *gids = kmem_alloc(*ngids * sizeof (gid_t), KM_SLEEP); bcopy(p->auth_srv_gids, *gids, *ngids * sizeof (gid_t)); } access = p->auth_access; if ((refresh > NFSAUTH_CACHE_REFRESH) && p->auth_state == NFS_AUTH_FRESH) { refreshq_auth_node_t *ran; uint_t nacr; p->auth_state = NFS_AUTH_STALE; mutex_exit(&p->auth_lock); nacr = atomic_inc_uint_nv(&nfsauth_cache_refresh); DTRACE_PROBE3(nfsauth__debug__cache__stale, struct exportinfo *, exi, struct auth_cache *, p, uint_t, nacr); ran = kmem_alloc(sizeof (refreshq_auth_node_t), KM_SLEEP); ran->ran_auth = p; ran->ran_netid = strdup(svc_getnetid(req->rq_xprt)); mutex_enter(&refreshq_lock); /* * We should not add a work queue * item if the thread is not * accepting them. */ if (refreshq_thread_state == REFRESHQ_THREAD_RUNNING) { refreshq_exi_node_t *ren; /* * Is there an existing exi_list? */ for (ren = list_head(&refreshq_queue); ren != NULL; ren = list_next(&refreshq_queue, ren)) { if (ren->ren_exi == exi) { list_insert_tail( &ren->ren_authlist, ran); break; } } if (ren == NULL) { ren = kmem_alloc( sizeof (refreshq_exi_node_t), KM_SLEEP); exi_hold(exi); ren->ren_exi = exi; list_create(&ren->ren_authlist, sizeof (refreshq_auth_node_t), offsetof(refreshq_auth_node_t, ran_node)); list_insert_tail(&ren->ren_authlist, ran); list_insert_tail(&refreshq_queue, ren); } cv_broadcast(&refreshq_cv); } else { strfree(ran->ran_netid); kmem_free(ran, sizeof (refreshq_auth_node_t)); } mutex_exit(&refreshq_lock); } else { mutex_exit(&p->auth_lock); } nach = atomic_inc_uint_nv(&nfsauth_cache_hit); DTRACE_PROBE2(nfsauth__debug__cache__hit, uint_t, nach, time_t, refresh); kmem_free(addr.buf, addr.maxlen); } return (access); retrieve: /* * Retrieve the required data without caching. */ ASSERT(p == NULL); atomic_inc_uint(&nfsauth_cache_miss); if (nfsauth_retrieve(exi, svc_getnetid(req->rq_xprt), flavor, &addr, &access, crgetuid(cr), crgetgid(cr), crgetngroups(cr), crgetgroups(cr), &tmpuid, &tmpgid, &tmpngids, &tmpgids)) { if (uid != NULL) *uid = tmpuid; if (gid != NULL) *gid = tmpgid; if (ngids != NULL && gids != NULL) { *ngids = tmpngids; *gids = tmpgids; } else { kmem_free(tmpgids, tmpngids * sizeof (gid_t)); } } kmem_free(addr.buf, addr.maxlen); return (access); } /* * Check if the requesting client has access to the filesystem with * a given nfs flavor number which is an explicitly shared flavor. */ int nfsauth4_secinfo_access(struct exportinfo *exi, struct svc_req *req, int flavor, int perm, cred_t *cr) { int access; if (! (perm & M_4SEC_EXPORTED)) { return (NFSAUTH_DENIED); } /* * Optimize if there are no lists */ if ((perm & (M_ROOT | M_NONE | M_MAP)) == 0) { perm &= ~M_4SEC_EXPORTED; if (perm == M_RO) return (NFSAUTH_RO); if (perm == M_RW) return (NFSAUTH_RW); } access = nfsauth_cache_get(exi, req, flavor, cr, NULL, NULL, NULL, NULL); return (access); } int nfsauth_access(struct exportinfo *exi, struct svc_req *req, cred_t *cr, uid_t *uid, gid_t *gid, uint_t *ngids, gid_t **gids) { int access, mapaccess; struct secinfo *sp; int i, flavor, perm; int authnone_entry = -1; /* * By default root is mapped to anonymous user. * This might get overriden later in nfsauth_cache_get(). */ if (crgetuid(cr) == 0) { if (uid != NULL) *uid = exi->exi_export.ex_anon; if (gid != NULL) *gid = exi->exi_export.ex_anon; } else { if (uid != NULL) *uid = crgetuid(cr); if (gid != NULL) *gid = crgetgid(cr); } if (ngids != NULL) *ngids = 0; if (gids != NULL) *gids = NULL; /* * Get the nfs flavor number from xprt. */ flavor = (int)(uintptr_t)req->rq_xprt->xp_cookie; /* * First check the access restrictions on the filesystem. If * there are no lists associated with this flavor then there's no * need to make an expensive call to the nfsauth service or to * cache anything. */ sp = exi->exi_export.ex_secinfo; for (i = 0; i < exi->exi_export.ex_seccnt; i++) { if (flavor != sp[i].s_secinfo.sc_nfsnum) { if (sp[i].s_secinfo.sc_nfsnum == AUTH_NONE) authnone_entry = i; continue; } break; } mapaccess = 0; if (i >= exi->exi_export.ex_seccnt) { /* * Flavor not found, but use AUTH_NONE if it exists */ if (authnone_entry == -1) return (NFSAUTH_DENIED); flavor = AUTH_NONE; mapaccess = NFSAUTH_MAPNONE; i = authnone_entry; } /* * If the flavor is in the ex_secinfo list, but not an explicitly * shared flavor by the user, it is a result of the nfsv4 server * namespace setup. We will grant an RO permission similar for * a pseudo node except that this node is a shared one. * * e.g. flavor in (flavor) indicates that it is not explictly * shared by the user: * * / (sys, krb5) * | * export #share -o sec=sys (krb5) * | * secure #share -o sec=krb5 * * In this case, when a krb5 request coming in to access * /export, RO permission is granted. */ if (!(sp[i].s_flags & M_4SEC_EXPORTED)) return (mapaccess | NFSAUTH_RO); /* * Optimize if there are no lists. * We cannot optimize for AUTH_SYS with NGRPS (16) supplemental groups. */ perm = sp[i].s_flags; if ((perm & (M_ROOT | M_NONE | M_MAP)) == 0 && (ngroups_max <= NGRPS || flavor != AUTH_SYS || crgetngroups(cr) < NGRPS)) { perm &= ~M_4SEC_EXPORTED; if (perm == M_RO) return (mapaccess | NFSAUTH_RO); if (perm == M_RW) return (mapaccess | NFSAUTH_RW); } access = nfsauth_cache_get(exi, req, flavor, cr, uid, gid, ngids, gids); /* * For both NFSAUTH_DENIED and NFSAUTH_WRONGSEC we do not care about * the supplemental groups. */ if (access & NFSAUTH_DENIED || access & NFSAUTH_WRONGSEC) { if (ngids != NULL && gids != NULL) { kmem_free(*gids, *ngids * sizeof (gid_t)); *ngids = 0; *gids = NULL; } } /* * Client's security flavor doesn't match with "ro" or * "rw" list. Try again using AUTH_NONE if present. */ if ((access & NFSAUTH_WRONGSEC) && (flavor != AUTH_NONE)) { /* * Have we already encountered AUTH_NONE ? */ if (authnone_entry != -1) { mapaccess = NFSAUTH_MAPNONE; access = nfsauth_cache_get(exi, req, AUTH_NONE, cr, NULL, NULL, NULL, NULL); } else { /* * Check for AUTH_NONE presence. */ for (; i < exi->exi_export.ex_seccnt; i++) { if (sp[i].s_secinfo.sc_nfsnum == AUTH_NONE) { mapaccess = NFSAUTH_MAPNONE; access = nfsauth_cache_get(exi, req, AUTH_NONE, cr, NULL, NULL, NULL, NULL); break; } } } } if (access & NFSAUTH_DENIED) access = NFSAUTH_DENIED; return (access | mapaccess); } static void nfsauth_free_clnt_node(struct auth_cache_clnt *p) { void *cookie = NULL; struct auth_cache *node; while ((node = avl_destroy_nodes(&p->authc_tree, &cookie)) != NULL) nfsauth_free_node(node); avl_destroy(&p->authc_tree); kmem_free(p->authc_addr.buf, p->authc_addr.maxlen); rw_destroy(&p->authc_lock); kmem_free(p, sizeof (*p)); } static void nfsauth_free_node(struct auth_cache *p) { kmem_free(p->auth_clnt_gids, p->auth_clnt_ngids * sizeof (gid_t)); kmem_free(p->auth_srv_gids, p->auth_srv_ngids * sizeof (gid_t)); mutex_destroy(&p->auth_lock); cv_destroy(&p->auth_cv); kmem_cache_free(exi_cache_handle, p); } /* * Free the nfsauth cache for a given export */ void nfsauth_cache_free(struct exportinfo *exi) { int i; /* * The only way we got here was with an exi_rele, which means that no * auth cache entry is being refreshed. */ for (i = 0; i < AUTH_TABLESIZE; i++) { avl_tree_t *tree = exi->exi_cache[i]; void *cookie = NULL; struct auth_cache_clnt *node; while ((node = avl_destroy_nodes(tree, &cookie)) != NULL) nfsauth_free_clnt_node(node); } } /* * Called by the kernel memory allocator when * memory is low. Free unused cache entries. * If that's not enough, the VM system will * call again for some more. */ /*ARGSUSED*/ void exi_cache_reclaim(void *cdrarg) { int i; struct exportinfo *exi; rw_enter(&exported_lock, RW_READER); for (i = 0; i < EXPTABLESIZE; i++) { for (exi = exptable[i]; exi; exi = exi->fid_hash.next) { exi_cache_trim(exi); } } rw_exit(&exported_lock); atomic_inc_uint(&nfsauth_cache_reclaim); } void exi_cache_trim(struct exportinfo *exi) { struct auth_cache_clnt *c; struct auth_cache_clnt *nextc; struct auth_cache *p; struct auth_cache *next; int i; time_t stale_time; avl_tree_t *tree; for (i = 0; i < AUTH_TABLESIZE; i++) { tree = exi->exi_cache[i]; stale_time = gethrestime_sec() - NFSAUTH_CACHE_TRIM; rw_enter(&exi->exi_cache_lock, RW_READER); /* * Free entries that have not been * used for NFSAUTH_CACHE_TRIM seconds. */ for (c = avl_first(tree); c != NULL; c = AVL_NEXT(tree, c)) { rw_enter(&c->authc_lock, RW_WRITER); for (p = avl_first(&c->authc_tree); p != NULL; p = next) { next = AVL_NEXT(&c->authc_tree, p); ASSERT(p->auth_state != NFS_AUTH_INVALID); mutex_enter(&p->auth_lock); /* * We won't trim recently used and/or WAITING * entries. */ if (p->auth_time > stale_time || p->auth_state == NFS_AUTH_WAITING) { mutex_exit(&p->auth_lock); continue; } DTRACE_PROBE1(nfsauth__debug__trim__state, auth_state_t, p->auth_state); /* * STALE and REFRESHING entries needs to be * marked INVALID only because they are * referenced by some other structures or * threads. They will be freed later. */ if (p->auth_state == NFS_AUTH_STALE || p->auth_state == NFS_AUTH_REFRESHING) { p->auth_state = NFS_AUTH_INVALID; mutex_exit(&p->auth_lock); avl_remove(&c->authc_tree, p); } else { mutex_exit(&p->auth_lock); avl_remove(&c->authc_tree, p); nfsauth_free_node(p); } } rw_exit(&c->authc_lock); } if (rw_tryupgrade(&exi->exi_cache_lock) == 0) { rw_exit(&exi->exi_cache_lock); rw_enter(&exi->exi_cache_lock, RW_WRITER); } for (c = avl_first(tree); c != NULL; c = nextc) { nextc = AVL_NEXT(tree, c); if (avl_is_empty(&c->authc_tree) == B_FALSE) continue; avl_remove(tree, c); nfsauth_free_clnt_node(c); } rw_exit(&exi->exi_cache_lock); } }