11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/net/sunrpc/auth.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Generic RPC client authentication API. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #include <linux/types.h> 101da177e4SLinus Torvalds #include <linux/sched.h> 111da177e4SLinus Torvalds #include <linux/module.h> 121da177e4SLinus Torvalds #include <linux/slab.h> 131da177e4SLinus Torvalds #include <linux/errno.h> 1425337fdcSTrond Myklebust #include <linux/hash.h> 151da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 166a1a1e34SChuck Lever #include <linux/sunrpc/gss_api.h> 171da177e4SLinus Torvalds #include <linux/spinlock.h> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #ifdef RPC_DEBUG 201da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_AUTH 211da177e4SLinus Torvalds #endif 221da177e4SLinus Torvalds 23241269bdSTrond Myklebust #define RPC_CREDCACHE_DEFAULT_HASHBITS (4) 24241269bdSTrond Myklebust struct rpc_cred_cache { 25241269bdSTrond Myklebust struct hlist_head *hashtable; 26241269bdSTrond Myklebust unsigned int hashbits; 27241269bdSTrond Myklebust spinlock_t lock; 28241269bdSTrond Myklebust }; 29241269bdSTrond Myklebust 30241269bdSTrond Myklebust static unsigned int auth_hashbits = RPC_CREDCACHE_DEFAULT_HASHBITS; 31241269bdSTrond Myklebust 32fc1b356fSTrond Myklebust static DEFINE_SPINLOCK(rpc_authflavor_lock); 33f1c0a861STrond Myklebust static const struct rpc_authops *auth_flavors[RPC_AUTH_MAXFLAVOR] = { 341da177e4SLinus Torvalds &authnull_ops, /* AUTH_NULL */ 351da177e4SLinus Torvalds &authunix_ops, /* AUTH_UNIX */ 361da177e4SLinus Torvalds NULL, /* others can be loadable modules */ 371da177e4SLinus Torvalds }; 381da177e4SLinus Torvalds 39e092bdcdSTrond Myklebust static LIST_HEAD(cred_unused); 40f5c2187cSTrond Myklebust static unsigned long number_cred_unused; 41e092bdcdSTrond Myklebust 42db5fe265SMiquel van Smoorenburg #define MAX_HASHTABLE_BITS (14) 438e4e15d4SStephen Rothwell static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp) 44241269bdSTrond Myklebust { 45241269bdSTrond Myklebust unsigned long num; 46241269bdSTrond Myklebust unsigned int nbits; 47241269bdSTrond Myklebust int ret; 48241269bdSTrond Myklebust 49241269bdSTrond Myklebust if (!val) 50241269bdSTrond Myklebust goto out_inval; 51241269bdSTrond Myklebust ret = strict_strtoul(val, 0, &num); 52241269bdSTrond Myklebust if (ret == -EINVAL) 53241269bdSTrond Myklebust goto out_inval; 54241269bdSTrond Myklebust nbits = fls(num); 55241269bdSTrond Myklebust if (num > (1U << nbits)) 56241269bdSTrond Myklebust nbits++; 57241269bdSTrond Myklebust if (nbits > MAX_HASHTABLE_BITS || nbits < 2) 58241269bdSTrond Myklebust goto out_inval; 59241269bdSTrond Myklebust *(unsigned int *)kp->arg = nbits; 60241269bdSTrond Myklebust return 0; 61241269bdSTrond Myklebust out_inval: 62241269bdSTrond Myklebust return -EINVAL; 63241269bdSTrond Myklebust } 64241269bdSTrond Myklebust 658e4e15d4SStephen Rothwell static int param_get_hashtbl_sz(char *buffer, const struct kernel_param *kp) 66241269bdSTrond Myklebust { 67241269bdSTrond Myklebust unsigned int nbits; 68241269bdSTrond Myklebust 69241269bdSTrond Myklebust nbits = *(unsigned int *)kp->arg; 70241269bdSTrond Myklebust return sprintf(buffer, "%u", 1U << nbits); 71241269bdSTrond Myklebust } 72241269bdSTrond Myklebust 73241269bdSTrond Myklebust #define param_check_hashtbl_sz(name, p) __param_check(name, p, unsigned int); 74241269bdSTrond Myklebust 758e4e15d4SStephen Rothwell static struct kernel_param_ops param_ops_hashtbl_sz = { 768e4e15d4SStephen Rothwell .set = param_set_hashtbl_sz, 778e4e15d4SStephen Rothwell .get = param_get_hashtbl_sz, 788e4e15d4SStephen Rothwell }; 798e4e15d4SStephen Rothwell 80241269bdSTrond Myklebust module_param_named(auth_hashtable_size, auth_hashbits, hashtbl_sz, 0644); 81241269bdSTrond Myklebust MODULE_PARM_DESC(auth_hashtable_size, "RPC credential cache hashtable size"); 82241269bdSTrond Myklebust 831da177e4SLinus Torvalds static u32 841da177e4SLinus Torvalds pseudoflavor_to_flavor(u32 flavor) { 851c74a244SChuck Lever if (flavor > RPC_AUTH_MAXFLAVOR) 861da177e4SLinus Torvalds return RPC_AUTH_GSS; 871da177e4SLinus Torvalds return flavor; 881da177e4SLinus Torvalds } 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds int 91f1c0a861STrond Myklebust rpcauth_register(const struct rpc_authops *ops) 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds rpc_authflavor_t flavor; 94fc1b356fSTrond Myklebust int ret = -EPERM; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) 971da177e4SLinus Torvalds return -EINVAL; 98fc1b356fSTrond Myklebust spin_lock(&rpc_authflavor_lock); 99fc1b356fSTrond Myklebust if (auth_flavors[flavor] == NULL) { 1001da177e4SLinus Torvalds auth_flavors[flavor] = ops; 101fc1b356fSTrond Myklebust ret = 0; 102fc1b356fSTrond Myklebust } 103fc1b356fSTrond Myklebust spin_unlock(&rpc_authflavor_lock); 104fc1b356fSTrond Myklebust return ret; 1051da177e4SLinus Torvalds } 106e8914c65STrond Myklebust EXPORT_SYMBOL_GPL(rpcauth_register); 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds int 109f1c0a861STrond Myklebust rpcauth_unregister(const struct rpc_authops *ops) 1101da177e4SLinus Torvalds { 1111da177e4SLinus Torvalds rpc_authflavor_t flavor; 112fc1b356fSTrond Myklebust int ret = -EPERM; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) 1151da177e4SLinus Torvalds return -EINVAL; 116fc1b356fSTrond Myklebust spin_lock(&rpc_authflavor_lock); 117fc1b356fSTrond Myklebust if (auth_flavors[flavor] == ops) { 1181da177e4SLinus Torvalds auth_flavors[flavor] = NULL; 119fc1b356fSTrond Myklebust ret = 0; 120fc1b356fSTrond Myklebust } 121fc1b356fSTrond Myklebust spin_unlock(&rpc_authflavor_lock); 122fc1b356fSTrond Myklebust return ret; 1231da177e4SLinus Torvalds } 124e8914c65STrond Myklebust EXPORT_SYMBOL_GPL(rpcauth_unregister); 1251da177e4SLinus Torvalds 1266a1a1e34SChuck Lever /** 1279568c5e9SChuck Lever * rpcauth_get_pseudoflavor - check if security flavor is supported 1289568c5e9SChuck Lever * @flavor: a security flavor 1299568c5e9SChuck Lever * @info: a GSS mech OID, quality of protection, and service value 1309568c5e9SChuck Lever * 1319568c5e9SChuck Lever * Verifies that an appropriate kernel module is available or already loaded. 1329568c5e9SChuck Lever * Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is 1339568c5e9SChuck Lever * not supported locally. 1349568c5e9SChuck Lever */ 1359568c5e9SChuck Lever rpc_authflavor_t 1369568c5e9SChuck Lever rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info) 1379568c5e9SChuck Lever { 1389568c5e9SChuck Lever const struct rpc_authops *ops; 1399568c5e9SChuck Lever rpc_authflavor_t pseudoflavor; 1409568c5e9SChuck Lever 1419568c5e9SChuck Lever ops = auth_flavors[flavor]; 1429568c5e9SChuck Lever if (ops == NULL) 1439568c5e9SChuck Lever request_module("rpc-auth-%u", flavor); 1449568c5e9SChuck Lever spin_lock(&rpc_authflavor_lock); 1459568c5e9SChuck Lever ops = auth_flavors[flavor]; 1469568c5e9SChuck Lever if (ops == NULL || !try_module_get(ops->owner)) { 1479568c5e9SChuck Lever spin_unlock(&rpc_authflavor_lock); 1489568c5e9SChuck Lever return RPC_AUTH_MAXFLAVOR; 1499568c5e9SChuck Lever } 1509568c5e9SChuck Lever spin_unlock(&rpc_authflavor_lock); 1519568c5e9SChuck Lever 1529568c5e9SChuck Lever pseudoflavor = flavor; 1539568c5e9SChuck Lever if (ops->info2flavor != NULL) 1549568c5e9SChuck Lever pseudoflavor = ops->info2flavor(info); 1559568c5e9SChuck Lever 1569568c5e9SChuck Lever module_put(ops->owner); 1579568c5e9SChuck Lever return pseudoflavor; 1589568c5e9SChuck Lever } 1599568c5e9SChuck Lever EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor); 1609568c5e9SChuck Lever 1619568c5e9SChuck Lever /** 162a77c806fSChuck Lever * rpcauth_get_gssinfo - find GSS tuple matching a GSS pseudoflavor 163a77c806fSChuck Lever * @pseudoflavor: GSS pseudoflavor to match 164a77c806fSChuck Lever * @info: rpcsec_gss_info structure to fill in 165a77c806fSChuck Lever * 166a77c806fSChuck Lever * Returns zero and fills in "info" if pseudoflavor matches a 167a77c806fSChuck Lever * supported mechanism. 168a77c806fSChuck Lever */ 169a77c806fSChuck Lever int 170a77c806fSChuck Lever rpcauth_get_gssinfo(rpc_authflavor_t pseudoflavor, struct rpcsec_gss_info *info) 171a77c806fSChuck Lever { 172a77c806fSChuck Lever rpc_authflavor_t flavor = pseudoflavor_to_flavor(pseudoflavor); 173a77c806fSChuck Lever const struct rpc_authops *ops; 174a77c806fSChuck Lever int result; 175a77c806fSChuck Lever 1761c74a244SChuck Lever if (flavor >= RPC_AUTH_MAXFLAVOR) 1771c74a244SChuck Lever return -EINVAL; 1781c74a244SChuck Lever 179a77c806fSChuck Lever ops = auth_flavors[flavor]; 180a77c806fSChuck Lever if (ops == NULL) 181a77c806fSChuck Lever request_module("rpc-auth-%u", flavor); 182a77c806fSChuck Lever spin_lock(&rpc_authflavor_lock); 183a77c806fSChuck Lever ops = auth_flavors[flavor]; 184a77c806fSChuck Lever if (ops == NULL || !try_module_get(ops->owner)) { 185a77c806fSChuck Lever spin_unlock(&rpc_authflavor_lock); 186a77c806fSChuck Lever return -ENOENT; 187a77c806fSChuck Lever } 188a77c806fSChuck Lever spin_unlock(&rpc_authflavor_lock); 189a77c806fSChuck Lever 190a77c806fSChuck Lever result = -ENOENT; 191a77c806fSChuck Lever if (ops->flavor2info != NULL) 192a77c806fSChuck Lever result = ops->flavor2info(pseudoflavor, info); 193a77c806fSChuck Lever 194a77c806fSChuck Lever module_put(ops->owner); 195a77c806fSChuck Lever return result; 196a77c806fSChuck Lever } 197a77c806fSChuck Lever EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo); 198a77c806fSChuck Lever 199a77c806fSChuck Lever /** 2006a1a1e34SChuck Lever * rpcauth_list_flavors - discover registered flavors and pseudoflavors 2016a1a1e34SChuck Lever * @array: array to fill in 2026a1a1e34SChuck Lever * @size: size of "array" 2036a1a1e34SChuck Lever * 2046a1a1e34SChuck Lever * Returns the number of array items filled in, or a negative errno. 2056a1a1e34SChuck Lever * 2066a1a1e34SChuck Lever * The returned array is not sorted by any policy. Callers should not 2076a1a1e34SChuck Lever * rely on the order of the items in the returned array. 2086a1a1e34SChuck Lever */ 2096a1a1e34SChuck Lever int 2106a1a1e34SChuck Lever rpcauth_list_flavors(rpc_authflavor_t *array, int size) 2116a1a1e34SChuck Lever { 2126a1a1e34SChuck Lever rpc_authflavor_t flavor; 2136a1a1e34SChuck Lever int result = 0; 2146a1a1e34SChuck Lever 2156a1a1e34SChuck Lever spin_lock(&rpc_authflavor_lock); 2166a1a1e34SChuck Lever for (flavor = 0; flavor < RPC_AUTH_MAXFLAVOR; flavor++) { 2176a1a1e34SChuck Lever const struct rpc_authops *ops = auth_flavors[flavor]; 2186a1a1e34SChuck Lever rpc_authflavor_t pseudos[4]; 2196a1a1e34SChuck Lever int i, len; 2206a1a1e34SChuck Lever 2216a1a1e34SChuck Lever if (result >= size) { 2226a1a1e34SChuck Lever result = -ENOMEM; 2236a1a1e34SChuck Lever break; 2246a1a1e34SChuck Lever } 2256a1a1e34SChuck Lever 2266a1a1e34SChuck Lever if (ops == NULL) 2276a1a1e34SChuck Lever continue; 2286a1a1e34SChuck Lever if (ops->list_pseudoflavors == NULL) { 2296a1a1e34SChuck Lever array[result++] = ops->au_flavor; 2306a1a1e34SChuck Lever continue; 2316a1a1e34SChuck Lever } 2326a1a1e34SChuck Lever len = ops->list_pseudoflavors(pseudos, ARRAY_SIZE(pseudos)); 2336a1a1e34SChuck Lever if (len < 0) { 2346a1a1e34SChuck Lever result = len; 2356a1a1e34SChuck Lever break; 2366a1a1e34SChuck Lever } 2376a1a1e34SChuck Lever for (i = 0; i < len; i++) { 2386a1a1e34SChuck Lever if (result >= size) { 2396a1a1e34SChuck Lever result = -ENOMEM; 2406a1a1e34SChuck Lever break; 2416a1a1e34SChuck Lever } 2426a1a1e34SChuck Lever array[result++] = pseudos[i]; 2436a1a1e34SChuck Lever } 2446a1a1e34SChuck Lever } 2456a1a1e34SChuck Lever spin_unlock(&rpc_authflavor_lock); 2466a1a1e34SChuck Lever 2476a1a1e34SChuck Lever dprintk("RPC: %s returns %d\n", __func__, result); 2486a1a1e34SChuck Lever return result; 2496a1a1e34SChuck Lever } 2506a1a1e34SChuck Lever EXPORT_SYMBOL_GPL(rpcauth_list_flavors); 2516a1a1e34SChuck Lever 2521da177e4SLinus Torvalds struct rpc_auth * 253c2190661STrond Myklebust rpcauth_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 2541da177e4SLinus Torvalds { 2551da177e4SLinus Torvalds struct rpc_auth *auth; 256f1c0a861STrond Myklebust const struct rpc_authops *ops; 257c2190661STrond Myklebust u32 flavor = pseudoflavor_to_flavor(args->pseudoflavor); 2581da177e4SLinus Torvalds 259f344f6dfSOlaf Kirch auth = ERR_PTR(-EINVAL); 260f344f6dfSOlaf Kirch if (flavor >= RPC_AUTH_MAXFLAVOR) 261f344f6dfSOlaf Kirch goto out; 262f344f6dfSOlaf Kirch 263f344f6dfSOlaf Kirch if ((ops = auth_flavors[flavor]) == NULL) 264f344f6dfSOlaf Kirch request_module("rpc-auth-%u", flavor); 265fc1b356fSTrond Myklebust spin_lock(&rpc_authflavor_lock); 266fc1b356fSTrond Myklebust ops = auth_flavors[flavor]; 267fc1b356fSTrond Myklebust if (ops == NULL || !try_module_get(ops->owner)) { 268fc1b356fSTrond Myklebust spin_unlock(&rpc_authflavor_lock); 269f344f6dfSOlaf Kirch goto out; 270fc1b356fSTrond Myklebust } 271fc1b356fSTrond Myklebust spin_unlock(&rpc_authflavor_lock); 272c2190661STrond Myklebust auth = ops->create(args, clnt); 273fc1b356fSTrond Myklebust module_put(ops->owner); 2746a19275aSJ. Bruce Fields if (IS_ERR(auth)) 2756a19275aSJ. Bruce Fields return auth; 2761da177e4SLinus Torvalds if (clnt->cl_auth) 277de7a8ce3STrond Myklebust rpcauth_release(clnt->cl_auth); 2781da177e4SLinus Torvalds clnt->cl_auth = auth; 279f344f6dfSOlaf Kirch 280f344f6dfSOlaf Kirch out: 2811da177e4SLinus Torvalds return auth; 2821da177e4SLinus Torvalds } 283e8914c65STrond Myklebust EXPORT_SYMBOL_GPL(rpcauth_create); 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds void 286de7a8ce3STrond Myklebust rpcauth_release(struct rpc_auth *auth) 2871da177e4SLinus Torvalds { 2881da177e4SLinus Torvalds if (!atomic_dec_and_test(&auth->au_count)) 2891da177e4SLinus Torvalds return; 2901da177e4SLinus Torvalds auth->au_ops->destroy(auth); 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds static DEFINE_SPINLOCK(rpc_credcache_lock); 2941da177e4SLinus Torvalds 29531be5bf1STrond Myklebust static void 29631be5bf1STrond Myklebust rpcauth_unhash_cred_locked(struct rpc_cred *cred) 29731be5bf1STrond Myklebust { 29831be5bf1STrond Myklebust hlist_del_rcu(&cred->cr_hash); 2994e857c58SPeter Zijlstra smp_mb__before_atomic(); 30031be5bf1STrond Myklebust clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags); 30131be5bf1STrond Myklebust } 30231be5bf1STrond Myklebust 303f0380f3dSTrond Myklebust static int 3049499b434STrond Myklebust rpcauth_unhash_cred(struct rpc_cred *cred) 3059499b434STrond Myklebust { 3069499b434STrond Myklebust spinlock_t *cache_lock; 307f0380f3dSTrond Myklebust int ret; 3089499b434STrond Myklebust 3099499b434STrond Myklebust cache_lock = &cred->cr_auth->au_credcache->lock; 3109499b434STrond Myklebust spin_lock(cache_lock); 311f0380f3dSTrond Myklebust ret = atomic_read(&cred->cr_count) == 0; 312f0380f3dSTrond Myklebust if (ret) 3139499b434STrond Myklebust rpcauth_unhash_cred_locked(cred); 3149499b434STrond Myklebust spin_unlock(cache_lock); 315f0380f3dSTrond Myklebust return ret; 3169499b434STrond Myklebust } 3179499b434STrond Myklebust 3181da177e4SLinus Torvalds /* 3191da177e4SLinus Torvalds * Initialize RPC credential cache 3201da177e4SLinus Torvalds */ 3211da177e4SLinus Torvalds int 322f5c2187cSTrond Myklebust rpcauth_init_credcache(struct rpc_auth *auth) 3231da177e4SLinus Torvalds { 3241da177e4SLinus Torvalds struct rpc_cred_cache *new; 325988664a0STrond Myklebust unsigned int hashsize; 3261da177e4SLinus Torvalds 3278b3a7005SKris Katterjohn new = kmalloc(sizeof(*new), GFP_KERNEL); 3281da177e4SLinus Torvalds if (!new) 329241269bdSTrond Myklebust goto out_nocache; 330241269bdSTrond Myklebust new->hashbits = auth_hashbits; 331988664a0STrond Myklebust hashsize = 1U << new->hashbits; 332241269bdSTrond Myklebust new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL); 333241269bdSTrond Myklebust if (!new->hashtable) 334241269bdSTrond Myklebust goto out_nohashtbl; 3359499b434STrond Myklebust spin_lock_init(&new->lock); 3361da177e4SLinus Torvalds auth->au_credcache = new; 3371da177e4SLinus Torvalds return 0; 338241269bdSTrond Myklebust out_nohashtbl: 339241269bdSTrond Myklebust kfree(new); 340241269bdSTrond Myklebust out_nocache: 341241269bdSTrond Myklebust return -ENOMEM; 3421da177e4SLinus Torvalds } 343e8914c65STrond Myklebust EXPORT_SYMBOL_GPL(rpcauth_init_credcache); 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds /* 3464de6caa2SAndy Adamson * Setup a credential key lifetime timeout notification 3474de6caa2SAndy Adamson */ 3484de6caa2SAndy Adamson int 3494de6caa2SAndy Adamson rpcauth_key_timeout_notify(struct rpc_auth *auth, struct rpc_cred *cred) 3504de6caa2SAndy Adamson { 3514de6caa2SAndy Adamson if (!cred->cr_auth->au_ops->key_timeout) 3524de6caa2SAndy Adamson return 0; 3534de6caa2SAndy Adamson return cred->cr_auth->au_ops->key_timeout(auth, cred); 3544de6caa2SAndy Adamson } 3554de6caa2SAndy Adamson EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify); 3564de6caa2SAndy Adamson 3574de6caa2SAndy Adamson bool 3584de6caa2SAndy Adamson rpcauth_cred_key_to_expire(struct rpc_cred *cred) 3594de6caa2SAndy Adamson { 3604de6caa2SAndy Adamson if (!cred->cr_ops->crkey_to_expire) 3614de6caa2SAndy Adamson return false; 3624de6caa2SAndy Adamson return cred->cr_ops->crkey_to_expire(cred); 3634de6caa2SAndy Adamson } 3644de6caa2SAndy Adamson EXPORT_SYMBOL_GPL(rpcauth_cred_key_to_expire); 3654de6caa2SAndy Adamson 366a0337d1dSJeff Layton char * 367a0337d1dSJeff Layton rpcauth_stringify_acceptor(struct rpc_cred *cred) 368a0337d1dSJeff Layton { 369a0337d1dSJeff Layton if (!cred->cr_ops->crstringify_acceptor) 370a0337d1dSJeff Layton return NULL; 371a0337d1dSJeff Layton return cred->cr_ops->crstringify_acceptor(cred); 372a0337d1dSJeff Layton } 373a0337d1dSJeff Layton EXPORT_SYMBOL_GPL(rpcauth_stringify_acceptor); 374a0337d1dSJeff Layton 3754de6caa2SAndy Adamson /* 3761da177e4SLinus Torvalds * Destroy a list of credentials 3771da177e4SLinus Torvalds */ 3781da177e4SLinus Torvalds static inline 379e092bdcdSTrond Myklebust void rpcauth_destroy_credlist(struct list_head *head) 3801da177e4SLinus Torvalds { 3811da177e4SLinus Torvalds struct rpc_cred *cred; 3821da177e4SLinus Torvalds 383e092bdcdSTrond Myklebust while (!list_empty(head)) { 384e092bdcdSTrond Myklebust cred = list_entry(head->next, struct rpc_cred, cr_lru); 385e092bdcdSTrond Myklebust list_del_init(&cred->cr_lru); 3861da177e4SLinus Torvalds put_rpccred(cred); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds /* 3911da177e4SLinus Torvalds * Clear the RPC credential cache, and delete those credentials 3921da177e4SLinus Torvalds * that are not referenced. 3931da177e4SLinus Torvalds */ 3941da177e4SLinus Torvalds void 3953ab9bb72STrond Myklebust rpcauth_clear_credcache(struct rpc_cred_cache *cache) 3961da177e4SLinus Torvalds { 397e092bdcdSTrond Myklebust LIST_HEAD(free); 398e092bdcdSTrond Myklebust struct hlist_head *head; 3991da177e4SLinus Torvalds struct rpc_cred *cred; 400988664a0STrond Myklebust unsigned int hashsize = 1U << cache->hashbits; 4011da177e4SLinus Torvalds int i; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds spin_lock(&rpc_credcache_lock); 4049499b434STrond Myklebust spin_lock(&cache->lock); 405988664a0STrond Myklebust for (i = 0; i < hashsize; i++) { 406e092bdcdSTrond Myklebust head = &cache->hashtable[i]; 407e092bdcdSTrond Myklebust while (!hlist_empty(head)) { 408e092bdcdSTrond Myklebust cred = hlist_entry(head->first, struct rpc_cred, cr_hash); 409e092bdcdSTrond Myklebust get_rpccred(cred); 410f5c2187cSTrond Myklebust if (!list_empty(&cred->cr_lru)) { 411f5c2187cSTrond Myklebust list_del(&cred->cr_lru); 412f5c2187cSTrond Myklebust number_cred_unused--; 413f5c2187cSTrond Myklebust } 414f5c2187cSTrond Myklebust list_add_tail(&cred->cr_lru, &free); 41531be5bf1STrond Myklebust rpcauth_unhash_cred_locked(cred); 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds } 4189499b434STrond Myklebust spin_unlock(&cache->lock); 4191da177e4SLinus Torvalds spin_unlock(&rpc_credcache_lock); 4201da177e4SLinus Torvalds rpcauth_destroy_credlist(&free); 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds 4233ab9bb72STrond Myklebust /* 4243ab9bb72STrond Myklebust * Destroy the RPC credential cache 4253ab9bb72STrond Myklebust */ 4263ab9bb72STrond Myklebust void 4273ab9bb72STrond Myklebust rpcauth_destroy_credcache(struct rpc_auth *auth) 4283ab9bb72STrond Myklebust { 4293ab9bb72STrond Myklebust struct rpc_cred_cache *cache = auth->au_credcache; 4303ab9bb72STrond Myklebust 4313ab9bb72STrond Myklebust if (cache) { 4323ab9bb72STrond Myklebust auth->au_credcache = NULL; 4333ab9bb72STrond Myklebust rpcauth_clear_credcache(cache); 434241269bdSTrond Myklebust kfree(cache->hashtable); 4353ab9bb72STrond Myklebust kfree(cache); 4363ab9bb72STrond Myklebust } 4373ab9bb72STrond Myklebust } 438e8914c65STrond Myklebust EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache); 4393ab9bb72STrond Myklebust 440d2b83141STrond Myklebust 441d2b83141STrond Myklebust #define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ) 442d2b83141STrond Myklebust 4431da177e4SLinus Torvalds /* 4441da177e4SLinus Torvalds * Remove stale credentials. Avoid sleeping inside the loop. 4451da177e4SLinus Torvalds */ 44670534a73SDave Chinner static long 447f5c2187cSTrond Myklebust rpcauth_prune_expired(struct list_head *free, int nr_to_scan) 4481da177e4SLinus Torvalds { 4499499b434STrond Myklebust spinlock_t *cache_lock; 450eac0d18dSTrond Myklebust struct rpc_cred *cred, *next; 451d2b83141STrond Myklebust unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM; 45270534a73SDave Chinner long freed = 0; 4531da177e4SLinus Torvalds 454eac0d18dSTrond Myklebust list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) { 455eac0d18dSTrond Myklebust 45620673406STrond Myklebust if (nr_to_scan-- == 0) 45720673406STrond Myklebust break; 45893a05e65STrond Myklebust /* 45993a05e65STrond Myklebust * Enforce a 60 second garbage collection moratorium 46093a05e65STrond Myklebust * Note that the cred_unused list must be time-ordered. 46193a05e65STrond Myklebust */ 4623d7b0894STrond Myklebust if (time_in_range(cred->cr_expire, expired, jiffies) && 463eac0d18dSTrond Myklebust test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) 46470534a73SDave Chinner break; 465eac0d18dSTrond Myklebust 466e092bdcdSTrond Myklebust list_del_init(&cred->cr_lru); 467f5c2187cSTrond Myklebust number_cred_unused--; 46870534a73SDave Chinner freed++; 469e092bdcdSTrond Myklebust if (atomic_read(&cred->cr_count) != 0) 470e092bdcdSTrond Myklebust continue; 471eac0d18dSTrond Myklebust 4729499b434STrond Myklebust cache_lock = &cred->cr_auth->au_credcache->lock; 4739499b434STrond Myklebust spin_lock(cache_lock); 4749499b434STrond Myklebust if (atomic_read(&cred->cr_count) == 0) { 475e092bdcdSTrond Myklebust get_rpccred(cred); 476e092bdcdSTrond Myklebust list_add_tail(&cred->cr_lru, free); 47731be5bf1STrond Myklebust rpcauth_unhash_cred_locked(cred); 4781da177e4SLinus Torvalds } 4799499b434STrond Myklebust spin_unlock(cache_lock); 4809499b434STrond Myklebust } 48170534a73SDave Chinner return freed; 4821da177e4SLinus Torvalds } 483e092bdcdSTrond Myklebust 484e092bdcdSTrond Myklebust /* 485f5c2187cSTrond Myklebust * Run memory cache shrinker. 486e092bdcdSTrond Myklebust */ 48770534a73SDave Chinner static unsigned long 48870534a73SDave Chinner rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) 48970534a73SDave Chinner 490e092bdcdSTrond Myklebust { 491f5c2187cSTrond Myklebust LIST_HEAD(free); 49270534a73SDave Chinner unsigned long freed; 493f5c2187cSTrond Myklebust 49470534a73SDave Chinner if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL) 49570534a73SDave Chinner return SHRINK_STOP; 49670534a73SDave Chinner 49770534a73SDave Chinner /* nothing left, don't come back */ 498f5c2187cSTrond Myklebust if (list_empty(&cred_unused)) 49970534a73SDave Chinner return SHRINK_STOP; 50070534a73SDave Chinner 50131be5bf1STrond Myklebust spin_lock(&rpc_credcache_lock); 50270534a73SDave Chinner freed = rpcauth_prune_expired(&free, sc->nr_to_scan); 50331be5bf1STrond Myklebust spin_unlock(&rpc_credcache_lock); 504f5c2187cSTrond Myklebust rpcauth_destroy_credlist(&free); 50570534a73SDave Chinner 50670534a73SDave Chinner return freed; 50770534a73SDave Chinner } 50870534a73SDave Chinner 50970534a73SDave Chinner static unsigned long 51070534a73SDave Chinner rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) 51170534a73SDave Chinner 51270534a73SDave Chinner { 51370534a73SDave Chinner return (number_cred_unused / 100) * sysctl_vfs_cache_pressure; 5141da177e4SLinus Torvalds } 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* 5171da177e4SLinus Torvalds * Look up a process' credentials in the authentication cache 5181da177e4SLinus Torvalds */ 5191da177e4SLinus Torvalds struct rpc_cred * 5201da177e4SLinus Torvalds rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred, 5218a317760STrond Myklebust int flags) 5221da177e4SLinus Torvalds { 523e092bdcdSTrond Myklebust LIST_HEAD(free); 5241da177e4SLinus Torvalds struct rpc_cred_cache *cache = auth->au_credcache; 52531be5bf1STrond Myklebust struct rpc_cred *cred = NULL, 52631be5bf1STrond Myklebust *entry, *new; 52725337fdcSTrond Myklebust unsigned int nr; 52825337fdcSTrond Myklebust 5299e469e30SEric W. Biederman nr = hash_long(from_kuid(&init_user_ns, acred->uid), cache->hashbits); 5301da177e4SLinus Torvalds 53131be5bf1STrond Myklebust rcu_read_lock(); 532b67bfe0dSSasha Levin hlist_for_each_entry_rcu(entry, &cache->hashtable[nr], cr_hash) { 53331be5bf1STrond Myklebust if (!entry->cr_ops->crmatch(acred, entry, flags)) 53431be5bf1STrond Myklebust continue; 5359499b434STrond Myklebust spin_lock(&cache->lock); 53631be5bf1STrond Myklebust if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) { 5379499b434STrond Myklebust spin_unlock(&cache->lock); 53831be5bf1STrond Myklebust continue; 53931be5bf1STrond Myklebust } 54031be5bf1STrond Myklebust cred = get_rpccred(entry); 5419499b434STrond Myklebust spin_unlock(&cache->lock); 54231be5bf1STrond Myklebust break; 54331be5bf1STrond Myklebust } 54431be5bf1STrond Myklebust rcu_read_unlock(); 54531be5bf1STrond Myklebust 5469499b434STrond Myklebust if (cred != NULL) 54731be5bf1STrond Myklebust goto found; 54831be5bf1STrond Myklebust 54931be5bf1STrond Myklebust new = auth->au_ops->crcreate(auth, acred, flags); 55031be5bf1STrond Myklebust if (IS_ERR(new)) { 55131be5bf1STrond Myklebust cred = new; 55231be5bf1STrond Myklebust goto out; 55331be5bf1STrond Myklebust } 55431be5bf1STrond Myklebust 5559499b434STrond Myklebust spin_lock(&cache->lock); 556b67bfe0dSSasha Levin hlist_for_each_entry(entry, &cache->hashtable[nr], cr_hash) { 557e092bdcdSTrond Myklebust if (!entry->cr_ops->crmatch(acred, entry, flags)) 558e092bdcdSTrond Myklebust continue; 559e092bdcdSTrond Myklebust cred = get_rpccred(entry); 5601da177e4SLinus Torvalds break; 5611da177e4SLinus Torvalds } 56231be5bf1STrond Myklebust if (cred == NULL) { 56331be5bf1STrond Myklebust cred = new; 56431be5bf1STrond Myklebust set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags); 56531be5bf1STrond Myklebust hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]); 56631be5bf1STrond Myklebust } else 567e092bdcdSTrond Myklebust list_add_tail(&new->cr_lru, &free); 5689499b434STrond Myklebust spin_unlock(&cache->lock); 56931be5bf1STrond Myklebust found: 570f64f9e71SJoe Perches if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 571f64f9e71SJoe Perches cred->cr_ops->cr_init != NULL && 572f64f9e71SJoe Perches !(flags & RPCAUTH_LOOKUP_NEW)) { 573fba3bad4STrond Myklebust int res = cred->cr_ops->cr_init(auth, cred); 574fba3bad4STrond Myklebust if (res < 0) { 575fba3bad4STrond Myklebust put_rpccred(cred); 576fba3bad4STrond Myklebust cred = ERR_PTR(res); 577fba3bad4STrond Myklebust } 5781da177e4SLinus Torvalds } 57931be5bf1STrond Myklebust rpcauth_destroy_credlist(&free); 58031be5bf1STrond Myklebust out: 58131be5bf1STrond Myklebust return cred; 5821da177e4SLinus Torvalds } 583e8914c65STrond Myklebust EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache); 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds struct rpc_cred * 5868a317760STrond Myklebust rpcauth_lookupcred(struct rpc_auth *auth, int flags) 5871da177e4SLinus Torvalds { 58886a264abSDavid Howells struct auth_cred acred; 5891da177e4SLinus Torvalds struct rpc_cred *ret; 59086a264abSDavid Howells const struct cred *cred = current_cred(); 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds dprintk("RPC: looking up %s cred\n", 5931da177e4SLinus Torvalds auth->au_ops->au_name); 59486a264abSDavid Howells 59586a264abSDavid Howells memset(&acred, 0, sizeof(acred)); 59686a264abSDavid Howells acred.uid = cred->fsuid; 59786a264abSDavid Howells acred.gid = cred->fsgid; 59886a264abSDavid Howells acred.group_info = get_group_info(((struct cred *)cred)->group_info); 59986a264abSDavid Howells 6008a317760STrond Myklebust ret = auth->au_ops->lookup_cred(auth, &acred, flags); 6011da177e4SLinus Torvalds put_group_info(acred.group_info); 6021da177e4SLinus Torvalds return ret; 6031da177e4SLinus Torvalds } 60466b06860SAndy Adamson EXPORT_SYMBOL_GPL(rpcauth_lookupcred); 6051da177e4SLinus Torvalds 6065fe4755eSTrond Myklebust void 6075fe4755eSTrond Myklebust rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred, 6085fe4755eSTrond Myklebust struct rpc_auth *auth, const struct rpc_credops *ops) 6095fe4755eSTrond Myklebust { 6105fe4755eSTrond Myklebust INIT_HLIST_NODE(&cred->cr_hash); 611e092bdcdSTrond Myklebust INIT_LIST_HEAD(&cred->cr_lru); 6125fe4755eSTrond Myklebust atomic_set(&cred->cr_count, 1); 6135fe4755eSTrond Myklebust cred->cr_auth = auth; 6145fe4755eSTrond Myklebust cred->cr_ops = ops; 6155fe4755eSTrond Myklebust cred->cr_expire = jiffies; 6165fe4755eSTrond Myklebust #ifdef RPC_DEBUG 6175fe4755eSTrond Myklebust cred->cr_magic = RPCAUTH_CRED_MAGIC; 6185fe4755eSTrond Myklebust #endif 6195fe4755eSTrond Myklebust cred->cr_uid = acred->uid; 6205fe4755eSTrond Myklebust } 621e8914c65STrond Myklebust EXPORT_SYMBOL_GPL(rpcauth_init_cred); 6225fe4755eSTrond Myklebust 6238572b8e2STrond Myklebust struct rpc_cred * 6245d351754STrond Myklebust rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred, int lookupflags) 6254ccda2cdSTrond Myklebust { 6264ccda2cdSTrond Myklebust dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid, 6274ccda2cdSTrond Myklebust cred->cr_auth->au_ops->au_name, cred); 6288572b8e2STrond Myklebust return get_rpccred(cred); 6294ccda2cdSTrond Myklebust } 6305c691044STrond Myklebust EXPORT_SYMBOL_GPL(rpcauth_generic_bind_cred); 6314ccda2cdSTrond Myklebust 6328572b8e2STrond Myklebust static struct rpc_cred * 6335d351754STrond Myklebust rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags) 6341da177e4SLinus Torvalds { 6351be27f36STrond Myklebust struct rpc_auth *auth = task->tk_client->cl_auth; 6361da177e4SLinus Torvalds struct auth_cred acred = { 637bf37f794SEric W. Biederman .uid = GLOBAL_ROOT_UID, 638bf37f794SEric W. Biederman .gid = GLOBAL_ROOT_GID, 6391da177e4SLinus Torvalds }; 6401da177e4SLinus Torvalds 64146121cf7SChuck Lever dprintk("RPC: %5u looking up %s cred\n", 6421be27f36STrond Myklebust task->tk_pid, task->tk_client->cl_auth->au_ops->au_name); 6438572b8e2STrond Myklebust return auth->au_ops->lookup_cred(auth, &acred, lookupflags); 644af093835STrond Myklebust } 645af093835STrond Myklebust 6468572b8e2STrond Myklebust static struct rpc_cred * 6475d351754STrond Myklebust rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags) 648af093835STrond Myklebust { 649af093835STrond Myklebust struct rpc_auth *auth = task->tk_client->cl_auth; 650af093835STrond Myklebust 651af093835STrond Myklebust dprintk("RPC: %5u looking up %s cred\n", 652af093835STrond Myklebust task->tk_pid, auth->au_ops->au_name); 6538572b8e2STrond Myklebust return rpcauth_lookupcred(auth, lookupflags); 6541da177e4SLinus Torvalds } 6551da177e4SLinus Torvalds 656a17c2153STrond Myklebust static int 6574ccda2cdSTrond Myklebust rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags) 6581da177e4SLinus Torvalds { 659a17c2153STrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 6608572b8e2STrond Myklebust struct rpc_cred *new; 6615d351754STrond Myklebust int lookupflags = 0; 6625d351754STrond Myklebust 6635d351754STrond Myklebust if (flags & RPC_TASK_ASYNC) 6645d351754STrond Myklebust lookupflags |= RPCAUTH_LOOKUP_NEW; 6654ccda2cdSTrond Myklebust if (cred != NULL) 6668572b8e2STrond Myklebust new = cred->cr_ops->crbind(task, cred, lookupflags); 6674ccda2cdSTrond Myklebust else if (flags & RPC_TASK_ROOTCREDS) 6688572b8e2STrond Myklebust new = rpcauth_bind_root_cred(task, lookupflags); 6694ccda2cdSTrond Myklebust else 6708572b8e2STrond Myklebust new = rpcauth_bind_new_cred(task, lookupflags); 6718572b8e2STrond Myklebust if (IS_ERR(new)) 6728572b8e2STrond Myklebust return PTR_ERR(new); 673a17c2153STrond Myklebust if (req->rq_cred != NULL) 674a17c2153STrond Myklebust put_rpccred(req->rq_cred); 675a17c2153STrond Myklebust req->rq_cred = new; 6768572b8e2STrond Myklebust return 0; 6771da177e4SLinus Torvalds } 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds void 6801da177e4SLinus Torvalds put_rpccred(struct rpc_cred *cred) 6811da177e4SLinus Torvalds { 682e092bdcdSTrond Myklebust /* Fast path for unhashed credentials */ 683f0380f3dSTrond Myklebust if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) { 684f0380f3dSTrond Myklebust if (atomic_dec_and_test(&cred->cr_count)) 685f0380f3dSTrond Myklebust cred->cr_ops->crdestroy(cred); 6861da177e4SLinus Torvalds return; 687f0380f3dSTrond Myklebust } 688f0380f3dSTrond Myklebust 689e092bdcdSTrond Myklebust if (!atomic_dec_and_lock(&cred->cr_count, &rpc_credcache_lock)) 690e092bdcdSTrond Myklebust return; 691f5c2187cSTrond Myklebust if (!list_empty(&cred->cr_lru)) { 692f5c2187cSTrond Myklebust number_cred_unused--; 693e092bdcdSTrond Myklebust list_del_init(&cred->cr_lru); 694f5c2187cSTrond Myklebust } 6955f707eb4STrond Myklebust if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) { 696f0380f3dSTrond Myklebust if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) { 697e092bdcdSTrond Myklebust cred->cr_expire = jiffies; 698e092bdcdSTrond Myklebust list_add_tail(&cred->cr_lru, &cred_unused); 699f5c2187cSTrond Myklebust number_cred_unused++; 700f0380f3dSTrond Myklebust goto out_nodestroy; 701f0380f3dSTrond Myklebust } 702f0380f3dSTrond Myklebust if (!rpcauth_unhash_cred(cred)) { 703f0380f3dSTrond Myklebust /* We were hashed and someone looked us up... */ 704f0380f3dSTrond Myklebust goto out_nodestroy; 705f0380f3dSTrond Myklebust } 706e092bdcdSTrond Myklebust } 707e092bdcdSTrond Myklebust spin_unlock(&rpc_credcache_lock); 7081da177e4SLinus Torvalds cred->cr_ops->crdestroy(cred); 709f0380f3dSTrond Myklebust return; 710f0380f3dSTrond Myklebust out_nodestroy: 711f0380f3dSTrond Myklebust spin_unlock(&rpc_credcache_lock); 7121da177e4SLinus Torvalds } 713e8914c65STrond Myklebust EXPORT_SYMBOL_GPL(put_rpccred); 7141da177e4SLinus Torvalds 715d8ed029dSAlexey Dobriyan __be32 * 716d8ed029dSAlexey Dobriyan rpcauth_marshcred(struct rpc_task *task, __be32 *p) 7171da177e4SLinus Torvalds { 718a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 7191da177e4SLinus Torvalds 72046121cf7SChuck Lever dprintk("RPC: %5u marshaling %s cred %p\n", 7211be27f36STrond Myklebust task->tk_pid, cred->cr_auth->au_ops->au_name, cred); 7220bbacc40SChuck Lever 7231da177e4SLinus Torvalds return cred->cr_ops->crmarshal(task, p); 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds 726d8ed029dSAlexey Dobriyan __be32 * 727d8ed029dSAlexey Dobriyan rpcauth_checkverf(struct rpc_task *task, __be32 *p) 7281da177e4SLinus Torvalds { 729a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 7301da177e4SLinus Torvalds 73146121cf7SChuck Lever dprintk("RPC: %5u validating %s cred %p\n", 7321be27f36STrond Myklebust task->tk_pid, cred->cr_auth->au_ops->au_name, cred); 7330bbacc40SChuck Lever 7341da177e4SLinus Torvalds return cred->cr_ops->crvalidate(task, p); 7351da177e4SLinus Torvalds } 7361da177e4SLinus Torvalds 7379f06c719SChuck Lever static void rpcauth_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, 7389f06c719SChuck Lever __be32 *data, void *obj) 7399f06c719SChuck Lever { 7409f06c719SChuck Lever struct xdr_stream xdr; 7419f06c719SChuck Lever 7429f06c719SChuck Lever xdr_init_encode(&xdr, &rqstp->rq_snd_buf, data); 7439f06c719SChuck Lever encode(rqstp, &xdr, obj); 7449f06c719SChuck Lever } 7459f06c719SChuck Lever 7461da177e4SLinus Torvalds int 7479f06c719SChuck Lever rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp, 748d8ed029dSAlexey Dobriyan __be32 *data, void *obj) 7491da177e4SLinus Torvalds { 750a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 7511da177e4SLinus Torvalds 75246121cf7SChuck Lever dprintk("RPC: %5u using %s cred %p to wrap rpc data\n", 7531da177e4SLinus Torvalds task->tk_pid, cred->cr_ops->cr_name, cred); 7541da177e4SLinus Torvalds if (cred->cr_ops->crwrap_req) 7551da177e4SLinus Torvalds return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj); 7561da177e4SLinus Torvalds /* By default, we encode the arguments normally. */ 7579f06c719SChuck Lever rpcauth_wrap_req_encode(encode, rqstp, data, obj); 7589f06c719SChuck Lever return 0; 7591da177e4SLinus Torvalds } 7601da177e4SLinus Torvalds 761bf269551SChuck Lever static int 762bf269551SChuck Lever rpcauth_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, 763bf269551SChuck Lever __be32 *data, void *obj) 764bf269551SChuck Lever { 765bf269551SChuck Lever struct xdr_stream xdr; 766bf269551SChuck Lever 767bf269551SChuck Lever xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, data); 768bf269551SChuck Lever return decode(rqstp, &xdr, obj); 769bf269551SChuck Lever } 770bf269551SChuck Lever 7711da177e4SLinus Torvalds int 772bf269551SChuck Lever rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp, 773d8ed029dSAlexey Dobriyan __be32 *data, void *obj) 7741da177e4SLinus Torvalds { 775a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 7761da177e4SLinus Torvalds 77746121cf7SChuck Lever dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n", 7781da177e4SLinus Torvalds task->tk_pid, cred->cr_ops->cr_name, cred); 7791da177e4SLinus Torvalds if (cred->cr_ops->crunwrap_resp) 7801da177e4SLinus Torvalds return cred->cr_ops->crunwrap_resp(task, decode, rqstp, 7811da177e4SLinus Torvalds data, obj); 7821da177e4SLinus Torvalds /* By default, we decode the arguments normally. */ 783bf269551SChuck Lever return rpcauth_unwrap_req_decode(decode, rqstp, data, obj); 7841da177e4SLinus Torvalds } 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds int 7871da177e4SLinus Torvalds rpcauth_refreshcred(struct rpc_task *task) 7881da177e4SLinus Torvalds { 7899a84d380STrond Myklebust struct rpc_cred *cred; 7901da177e4SLinus Torvalds int err; 7911da177e4SLinus Torvalds 792a17c2153STrond Myklebust cred = task->tk_rqstp->rq_cred; 793a17c2153STrond Myklebust if (cred == NULL) { 794a17c2153STrond Myklebust err = rpcauth_bindcred(task, task->tk_msg.rpc_cred, task->tk_flags); 795a17c2153STrond Myklebust if (err < 0) 796a17c2153STrond Myklebust goto out; 797a17c2153STrond Myklebust cred = task->tk_rqstp->rq_cred; 798f81c6224SJoe Perches } 79946121cf7SChuck Lever dprintk("RPC: %5u refreshing %s cred %p\n", 8001be27f36STrond Myklebust task->tk_pid, cred->cr_auth->au_ops->au_name, cred); 8010bbacc40SChuck Lever 8021da177e4SLinus Torvalds err = cred->cr_ops->crrefresh(task); 803a17c2153STrond Myklebust out: 8041da177e4SLinus Torvalds if (err < 0) 8051da177e4SLinus Torvalds task->tk_status = err; 8061da177e4SLinus Torvalds return err; 8071da177e4SLinus Torvalds } 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds void 8101da177e4SLinus Torvalds rpcauth_invalcred(struct rpc_task *task) 8111da177e4SLinus Torvalds { 812a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 813fc432dd9STrond Myklebust 81446121cf7SChuck Lever dprintk("RPC: %5u invalidating %s cred %p\n", 8151be27f36STrond Myklebust task->tk_pid, cred->cr_auth->au_ops->au_name, cred); 816fc432dd9STrond Myklebust if (cred) 817fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 8181da177e4SLinus Torvalds } 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds int 8211da177e4SLinus Torvalds rpcauth_uptodatecred(struct rpc_task *task) 8221da177e4SLinus Torvalds { 823a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 824fc432dd9STrond Myklebust 825fc432dd9STrond Myklebust return cred == NULL || 826fc432dd9STrond Myklebust test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0; 8271da177e4SLinus Torvalds } 828f5c2187cSTrond Myklebust 8298e1f936bSRusty Russell static struct shrinker rpc_cred_shrinker = { 83070534a73SDave Chinner .count_objects = rpcauth_cache_shrink_count, 83170534a73SDave Chinner .scan_objects = rpcauth_cache_shrink_scan, 8328e1f936bSRusty Russell .seeks = DEFAULT_SEEKS, 8338e1f936bSRusty Russell }; 834f5c2187cSTrond Myklebust 8355d8d9a4dSTrond Myklebust int __init rpcauth_init_module(void) 836f5c2187cSTrond Myklebust { 8375d8d9a4dSTrond Myklebust int err; 8385d8d9a4dSTrond Myklebust 8395d8d9a4dSTrond Myklebust err = rpc_init_authunix(); 8405d8d9a4dSTrond Myklebust if (err < 0) 8415d8d9a4dSTrond Myklebust goto out1; 8425d8d9a4dSTrond Myklebust err = rpc_init_generic_auth(); 8435d8d9a4dSTrond Myklebust if (err < 0) 8445d8d9a4dSTrond Myklebust goto out2; 8458e1f936bSRusty Russell register_shrinker(&rpc_cred_shrinker); 8465d8d9a4dSTrond Myklebust return 0; 8475d8d9a4dSTrond Myklebust out2: 8485d8d9a4dSTrond Myklebust rpc_destroy_authunix(); 8495d8d9a4dSTrond Myklebust out1: 8505d8d9a4dSTrond Myklebust return err; 851f5c2187cSTrond Myklebust } 852f5c2187cSTrond Myklebust 853c135e84aSStephen Rothwell void rpcauth_remove_module(void) 854f5c2187cSTrond Myklebust { 8555d8d9a4dSTrond Myklebust rpc_destroy_authunix(); 8565d8d9a4dSTrond Myklebust rpc_destroy_generic_auth(); 8578e1f936bSRusty Russell unregister_shrinker(&rpc_cred_shrinker); 858f5c2187cSTrond Myklebust } 859