11da177e4SLinus Torvalds /* 2f30c2269SUwe Zeisberger * linux/net/sunrpc/auth_gss/auth_gss.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * RPCSEC_GSS client authentication. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (c) 2000 The Regents of the University of Michigan. 71da177e4SLinus Torvalds * All rights reserved. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Dug Song <dugsong@monkey.org> 101da177e4SLinus Torvalds * Andy Adamson <andros@umich.edu> 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Redistribution and use in source and binary forms, with or without 131da177e4SLinus Torvalds * modification, are permitted provided that the following conditions 141da177e4SLinus Torvalds * are met: 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * 1. Redistributions of source code must retain the above copyright 171da177e4SLinus Torvalds * notice, this list of conditions and the following disclaimer. 181da177e4SLinus Torvalds * 2. Redistributions in binary form must reproduce the above copyright 191da177e4SLinus Torvalds * notice, this list of conditions and the following disclaimer in the 201da177e4SLinus Torvalds * documentation and/or other materials provided with the distribution. 211da177e4SLinus Torvalds * 3. Neither the name of the University nor the names of its 221da177e4SLinus Torvalds * contributors may be used to endorse or promote products derived 231da177e4SLinus Torvalds * from this software without specific prior written permission. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 261da177e4SLinus Torvalds * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 271da177e4SLinus Torvalds * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 281da177e4SLinus Torvalds * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 291da177e4SLinus Torvalds * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 301da177e4SLinus Torvalds * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 311da177e4SLinus Torvalds * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 321da177e4SLinus Torvalds * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 331da177e4SLinus Torvalds * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 341da177e4SLinus Torvalds * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 351da177e4SLinus Torvalds * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 361da177e4SLinus Torvalds */ 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #include <linux/module.h> 401da177e4SLinus Torvalds #include <linux/init.h> 411da177e4SLinus Torvalds #include <linux/types.h> 421da177e4SLinus Torvalds #include <linux/slab.h> 431da177e4SLinus Torvalds #include <linux/sched.h> 442d2da60cSJ. Bruce Fields #include <linux/pagemap.h> 451da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 461da177e4SLinus Torvalds #include <linux/sunrpc/auth.h> 471da177e4SLinus Torvalds #include <linux/sunrpc/auth_gss.h> 481da177e4SLinus Torvalds #include <linux/sunrpc/svcauth_gss.h> 491da177e4SLinus Torvalds #include <linux/sunrpc/gss_err.h> 501da177e4SLinus Torvalds #include <linux/workqueue.h> 511da177e4SLinus Torvalds #include <linux/sunrpc/rpc_pipe_fs.h> 521da177e4SLinus Torvalds #include <linux/sunrpc/gss_api.h> 531da177e4SLinus Torvalds #include <asm/uaccess.h> 541da177e4SLinus Torvalds 55f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops; 561da177e4SLinus Torvalds 57f1c0a861STrond Myklebust static const struct rpc_credops gss_credops; 580df7fb74STrond Myklebust static const struct rpc_credops gss_nullops; 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds #ifdef RPC_DEBUG 611da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_AUTH 621da177e4SLinus Torvalds #endif 631da177e4SLinus Torvalds 64d25a03cfS\\\"J. Bruce Fields\\\ #define GSS_CRED_SLACK 1024 651da177e4SLinus Torvalds /* length of a krb5 verifier (48), plus data added before arguments when 661da177e4SLinus Torvalds * using integrity (two 4-byte integers): */ 67adeb8133SOlga Kornievskaia #define GSS_VERF_SLACK 100 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds struct gss_auth { 700285ed1fSTrond Myklebust struct kref kref; 711da177e4SLinus Torvalds struct rpc_auth rpc_auth; 721da177e4SLinus Torvalds struct gss_api_mech *mech; 731da177e4SLinus Torvalds enum rpc_gss_svc service; 741da177e4SLinus Torvalds struct rpc_clnt *client; 751da177e4SLinus Torvalds struct dentry *dentry; 761da177e4SLinus Torvalds }; 771da177e4SLinus Torvalds 785d28dc82STrond Myklebust static void gss_free_ctx(struct gss_cl_ctx *); 791da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds static inline struct gss_cl_ctx * 821da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds atomic_inc(&ctx->count); 851da177e4SLinus Torvalds return ctx; 861da177e4SLinus Torvalds } 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds static inline void 891da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 901da177e4SLinus Torvalds { 911da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 925d28dc82STrond Myklebust gss_free_ctx(ctx); 931da177e4SLinus Torvalds } 941da177e4SLinus Torvalds 955d28dc82STrond Myklebust /* gss_cred_set_ctx: 965d28dc82STrond Myklebust * called by gss_upcall_callback and gss_create_upcall in order 975d28dc82STrond Myklebust * to set the gss context. The actual exchange of an old context 985d28dc82STrond Myklebust * and a new one is protected by the inode->i_lock. 995d28dc82STrond Myklebust */ 1001da177e4SLinus Torvalds static void 1011da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1021da177e4SLinus Torvalds { 1031da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1045d28dc82STrond Myklebust 105cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 106cd019f75STrond Myklebust return; 1077b6962b0STrond Myklebust gss_get_ctx(ctx); 1085d28dc82STrond Myklebust rcu_assign_pointer(gss_cred->gc_ctx, ctx); 109fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 110cd019f75STrond Myklebust smp_mb__before_clear_bit(); 111fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds static const void * 1151da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1161da177e4SLinus Torvalds { 1171da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1181da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1191da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1201da177e4SLinus Torvalds memcpy(res, p, len); 1211da177e4SLinus Torvalds return q; 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds static inline const void * 1251da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1261da177e4SLinus Torvalds { 1271da177e4SLinus Torvalds const void *q; 1281da177e4SLinus Torvalds unsigned int len; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1311da177e4SLinus Torvalds if (IS_ERR(p)) 1321da177e4SLinus Torvalds return p; 1331da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1341da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1351da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1360f38b873STrond Myklebust dest->data = kmemdup(p, len, GFP_NOFS); 1371da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1381da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1391da177e4SLinus Torvalds dest->len = len; 1401da177e4SLinus Torvalds return q; 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds static struct gss_cl_ctx * 1441da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1451da177e4SLinus Torvalds { 1461da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1471da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1481da177e4SLinus Torvalds 1495d28dc82STrond Myklebust rcu_read_lock(); 1501da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1511da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1525d28dc82STrond Myklebust rcu_read_unlock(); 1531da177e4SLinus Torvalds return ctx; 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds static struct gss_cl_ctx * 1571da177e4SLinus Torvalds gss_alloc_context(void) 1581da177e4SLinus Torvalds { 1591da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1601da177e4SLinus Torvalds 1610f38b873STrond Myklebust ctx = kzalloc(sizeof(*ctx), GFP_NOFS); 1621da177e4SLinus Torvalds if (ctx != NULL) { 1631da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 1641da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 1651da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 1661da177e4SLinus Torvalds atomic_set(&ctx->count,1); 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds return ctx; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 1721da177e4SLinus Torvalds static const void * 1731da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 1741da177e4SLinus Torvalds { 1751da177e4SLinus Torvalds const void *q; 1761da177e4SLinus Torvalds unsigned int seclen; 1771da177e4SLinus Torvalds unsigned int timeout; 1781da177e4SLinus Torvalds u32 window_size; 1791da177e4SLinus Torvalds int ret; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds /* First unsigned int gives the lifetime (in seconds) of the cred */ 1821da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 1831da177e4SLinus Torvalds if (IS_ERR(p)) 1841da177e4SLinus Torvalds goto err; 1851da177e4SLinus Torvalds if (timeout == 0) 1861da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 1871da177e4SLinus Torvalds ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 1881da177e4SLinus Torvalds /* Sequence number window. Determines the maximum number of simultaneous requests */ 1891da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 1901da177e4SLinus Torvalds if (IS_ERR(p)) 1911da177e4SLinus Torvalds goto err; 1921da177e4SLinus Torvalds ctx->gc_win = window_size; 1931da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 1941da177e4SLinus Torvalds if (ctx->gc_win == 0) { 1951da177e4SLinus Torvalds /* in which case, p points to an error code which we ignore */ 1961da177e4SLinus Torvalds p = ERR_PTR(-EACCES); 1971da177e4SLinus Torvalds goto err; 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds /* copy the opaque wire context */ 2001da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2011da177e4SLinus Torvalds if (IS_ERR(p)) 2021da177e4SLinus Torvalds goto err; 2031da177e4SLinus Torvalds /* import the opaque security context */ 2041da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2051da177e4SLinus Torvalds if (IS_ERR(p)) 2061da177e4SLinus Torvalds goto err; 2071da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2081da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2091da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2101da177e4SLinus Torvalds goto err; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 2131da177e4SLinus Torvalds if (ret < 0) { 2141da177e4SLinus Torvalds p = ERR_PTR(ret); 2151da177e4SLinus Torvalds goto err; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds return q; 2181da177e4SLinus Torvalds err: 2191da177e4SLinus Torvalds dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 2201da177e4SLinus Torvalds return p; 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds struct gss_upcall_msg { 2251da177e4SLinus Torvalds atomic_t count; 2261da177e4SLinus Torvalds uid_t uid; 2271da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2281da177e4SLinus Torvalds struct list_head list; 2291da177e4SLinus Torvalds struct gss_auth *auth; 2301da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2311da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2321da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 2331da177e4SLinus Torvalds }; 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds static void 2361da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 2371da177e4SLinus Torvalds { 2381da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 2391da177e4SLinus Torvalds return; 2401da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 2411da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 2421da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 243f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 2441da177e4SLinus Torvalds kfree(gss_msg); 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds static struct gss_upcall_msg * 2486e84c7b6STrond Myklebust __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 2491da177e4SLinus Torvalds { 2501da177e4SLinus Torvalds struct gss_upcall_msg *pos; 2516e84c7b6STrond Myklebust list_for_each_entry(pos, &rpci->in_downcall, list) { 2521da177e4SLinus Torvalds if (pos->uid != uid) 2531da177e4SLinus Torvalds continue; 2541da177e4SLinus Torvalds atomic_inc(&pos->count); 2551da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found msg %p\n", pos); 2561da177e4SLinus Torvalds return pos; 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found nothing\n"); 2591da177e4SLinus Torvalds return NULL; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 262720b8f2dS\\\"J. Bruce Fields\\\ /* Try to add an upcall to the pipefs queue. 2631da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 2641da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 2651da177e4SLinus Torvalds */ 2661da177e4SLinus Torvalds static inline struct gss_upcall_msg * 2671da177e4SLinus Torvalds gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) 2681da177e4SLinus Torvalds { 269b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 2706e84c7b6STrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 2711da177e4SLinus Torvalds struct gss_upcall_msg *old; 2721da177e4SLinus Torvalds 273b185f835STrond Myklebust spin_lock(&inode->i_lock); 2746e84c7b6STrond Myklebust old = __gss_find_upcall(rpci, gss_msg->uid); 2751da177e4SLinus Torvalds if (old == NULL) { 2761da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 2776e84c7b6STrond Myklebust list_add(&gss_msg->list, &rpci->in_downcall); 2781da177e4SLinus Torvalds } else 2791da177e4SLinus Torvalds gss_msg = old; 280b185f835STrond Myklebust spin_unlock(&inode->i_lock); 2811da177e4SLinus Torvalds return gss_msg; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds static void 2851da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 2861da177e4SLinus Torvalds { 2871da177e4SLinus Torvalds list_del_init(&gss_msg->list); 2881da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 2891da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 2901da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds static void 2941da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds struct gss_auth *gss_auth = gss_msg->auth; 297b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 2981da177e4SLinus Torvalds 2993b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3003b68aaeaSTrond Myklebust return; 301b185f835STrond Myklebust spin_lock(&inode->i_lock); 3023b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3031da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 304b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3051da177e4SLinus Torvalds } 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds static void 3081da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 3091da177e4SLinus Torvalds { 3101da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 3111da177e4SLinus Torvalds struct gss_cred, gc_base); 3121da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 313b185f835STrond Myklebust struct inode *inode = gss_msg->auth->dentry->d_inode; 3141da177e4SLinus Torvalds 3155d28dc82STrond Myklebust spin_lock(&inode->i_lock); 3161da177e4SLinus Torvalds if (gss_msg->ctx) 3177b6962b0STrond Myklebust gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 3181da177e4SLinus Torvalds else 3191da177e4SLinus Torvalds task->tk_status = gss_msg->msg.errno; 3201da177e4SLinus Torvalds gss_cred->gc_upcall = NULL; 3211da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 322b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3231da177e4SLinus Torvalds gss_release_msg(gss_msg); 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds static inline struct gss_upcall_msg * 3271da177e4SLinus Torvalds gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) 3281da177e4SLinus Torvalds { 3291da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 3301da177e4SLinus Torvalds 3310f38b873STrond Myklebust gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 3321da177e4SLinus Torvalds if (gss_msg != NULL) { 3331da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 3341da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 3351da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 3361da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 3371da177e4SLinus Torvalds gss_msg->msg.data = &gss_msg->uid; 3381da177e4SLinus Torvalds gss_msg->msg.len = sizeof(gss_msg->uid); 3391da177e4SLinus Torvalds gss_msg->uid = uid; 3401da177e4SLinus Torvalds gss_msg->auth = gss_auth; 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds return gss_msg; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds static struct gss_upcall_msg * 3461da177e4SLinus Torvalds gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 3471da177e4SLinus Torvalds { 3487c67db3aSTrond Myklebust struct gss_cred *gss_cred = container_of(cred, 3497c67db3aSTrond Myklebust struct gss_cred, gc_base); 3501da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 3517c67db3aSTrond Myklebust uid_t uid = cred->cr_uid; 3521da177e4SLinus Torvalds 3537c67db3aSTrond Myklebust /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */ 3547c67db3aSTrond Myklebust if (gss_cred->gc_machine_cred != 0) 3557c67db3aSTrond Myklebust uid = 0; 3567c67db3aSTrond Myklebust 3577c67db3aSTrond Myklebust gss_new = gss_alloc_msg(gss_auth, uid); 3581da177e4SLinus Torvalds if (gss_new == NULL) 3591da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 3601da177e4SLinus Torvalds gss_msg = gss_add_msg(gss_auth, gss_new); 3611da177e4SLinus Torvalds if (gss_msg == gss_new) { 3621da177e4SLinus Torvalds int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); 3631da177e4SLinus Torvalds if (res) { 3641da177e4SLinus Torvalds gss_unhash_msg(gss_new); 3651da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds } else 3681da177e4SLinus Torvalds gss_release_msg(gss_new); 3691da177e4SLinus Torvalds return gss_msg; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds static inline int 3731da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 3741da177e4SLinus Torvalds { 3751da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 3764a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 3771da177e4SLinus Torvalds struct gss_auth, rpc_auth); 3781da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 3791da177e4SLinus Torvalds struct gss_cred, gc_base); 3801da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 381b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 3821da177e4SLinus Torvalds int err = 0; 3831da177e4SLinus Torvalds 3848885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 3858885cb36SChuck Lever cred->cr_uid); 3861da177e4SLinus Torvalds gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 3871da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 3881da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 3891da177e4SLinus Torvalds goto out; 3901da177e4SLinus Torvalds } 391b185f835STrond Myklebust spin_lock(&inode->i_lock); 3921da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 3935d00837bSTrond Myklebust rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 3947b6962b0STrond Myklebust else if (gss_msg->ctx != NULL) { 3957b6962b0STrond Myklebust gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 3967b6962b0STrond Myklebust gss_cred->gc_upcall = NULL; 3977b6962b0STrond Myklebust rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3987b6962b0STrond Myklebust } else if (gss_msg->msg.errno >= 0) { 3991da177e4SLinus Torvalds task->tk_timeout = 0; 4001da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 4011da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 4021da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 4035d00837bSTrond Myklebust rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 4041da177e4SLinus Torvalds } else 4051da177e4SLinus Torvalds err = gss_msg->msg.errno; 406b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4071da177e4SLinus Torvalds gss_release_msg(gss_msg); 4081da177e4SLinus Torvalds out: 4098885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 4108885cb36SChuck Lever task->tk_pid, cred->cr_uid, err); 4111da177e4SLinus Torvalds return err; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds static inline int 4151da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 4161da177e4SLinus Torvalds { 417b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 4181da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 4191da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 4201da177e4SLinus Torvalds DEFINE_WAIT(wait); 4211da177e4SLinus Torvalds int err = 0; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 4241da177e4SLinus Torvalds gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 4251da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4261da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4271da177e4SLinus Torvalds goto out; 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds for (;;) { 4301da177e4SLinus Torvalds prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 431b185f835STrond Myklebust spin_lock(&inode->i_lock); 4321da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 4331da177e4SLinus Torvalds break; 4341da177e4SLinus Torvalds } 435b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4361da177e4SLinus Torvalds if (signalled()) { 4371da177e4SLinus Torvalds err = -ERESTARTSYS; 4381da177e4SLinus Torvalds goto out_intr; 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds schedule(); 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds if (gss_msg->ctx) 4437b6962b0STrond Myklebust gss_cred_set_ctx(cred, gss_msg->ctx); 4441da177e4SLinus Torvalds else 4451da177e4SLinus Torvalds err = gss_msg->msg.errno; 4465d28dc82STrond Myklebust spin_unlock(&inode->i_lock); 4471da177e4SLinus Torvalds out_intr: 4481da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 4491da177e4SLinus Torvalds gss_release_msg(gss_msg); 4501da177e4SLinus Torvalds out: 4518885cb36SChuck Lever dprintk("RPC: gss_create_upcall for uid %u result %d\n", 4528885cb36SChuck Lever cred->cr_uid, err); 4531da177e4SLinus Torvalds return err; 4541da177e4SLinus Torvalds } 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds static ssize_t 4571da177e4SLinus Torvalds gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 4581da177e4SLinus Torvalds char __user *dst, size_t buflen) 4591da177e4SLinus Torvalds { 4601da177e4SLinus Torvalds char *data = (char *)msg->data + msg->copied; 4617df08995SChuck Lever size_t mlen = min(msg->len, buflen); 4627df08995SChuck Lever unsigned long left; 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds left = copy_to_user(dst, data, mlen); 4657df08995SChuck Lever if (left == mlen) { 4667df08995SChuck Lever msg->errno = -EFAULT; 4677df08995SChuck Lever return -EFAULT; 4681da177e4SLinus Torvalds } 4697df08995SChuck Lever 4701da177e4SLinus Torvalds mlen -= left; 4711da177e4SLinus Torvalds msg->copied += mlen; 4721da177e4SLinus Torvalds msg->errno = 0; 4731da177e4SLinus Torvalds return mlen; 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds static ssize_t 4791da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 4801da177e4SLinus Torvalds { 4811da177e4SLinus Torvalds const void *p, *end; 4821da177e4SLinus Torvalds void *buf; 4831da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 484b185f835STrond Myklebust struct inode *inode = filp->f_path.dentry->d_inode; 4851da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 4861da177e4SLinus Torvalds uid_t uid; 4873b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 4901da177e4SLinus Torvalds goto out; 4911da177e4SLinus Torvalds err = -ENOMEM; 4920f38b873STrond Myklebust buf = kmalloc(mlen, GFP_NOFS); 4931da177e4SLinus Torvalds if (!buf) 4941da177e4SLinus Torvalds goto out; 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds err = -EFAULT; 4971da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 4981da177e4SLinus Torvalds goto err; 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 5011da177e4SLinus Torvalds p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 5021da177e4SLinus Torvalds if (IS_ERR(p)) { 5031da177e4SLinus Torvalds err = PTR_ERR(p); 5041da177e4SLinus Torvalds goto err; 5051da177e4SLinus Torvalds } 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds err = -ENOMEM; 5081da177e4SLinus Torvalds ctx = gss_alloc_context(); 5091da177e4SLinus Torvalds if (ctx == NULL) 5101da177e4SLinus Torvalds goto err; 5113b68aaeaSTrond Myklebust 5123b68aaeaSTrond Myklebust err = -ENOENT; 5133b68aaeaSTrond Myklebust /* Find a matching upcall */ 5143b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5156e84c7b6STrond Myklebust gss_msg = __gss_find_upcall(RPC_I(inode), uid); 5163b68aaeaSTrond Myklebust if (gss_msg == NULL) { 5173b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5183b68aaeaSTrond Myklebust goto err_put_ctx; 5193b68aaeaSTrond Myklebust } 5203b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 5213b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5223b68aaeaSTrond Myklebust 5236e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 5241da177e4SLinus Torvalds if (IS_ERR(p)) { 5251da177e4SLinus Torvalds err = PTR_ERR(p); 526ffc40f56SKevin Coffman gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES; 5273b68aaeaSTrond Myklebust goto err_release_msg; 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 5303b68aaeaSTrond Myklebust err = mlen; 5313b68aaeaSTrond Myklebust 5323b68aaeaSTrond Myklebust err_release_msg: 5333b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5341da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 535b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5361da177e4SLinus Torvalds gss_release_msg(gss_msg); 5371da177e4SLinus Torvalds err_put_ctx: 5381da177e4SLinus Torvalds gss_put_ctx(ctx); 5391da177e4SLinus Torvalds err: 5401da177e4SLinus Torvalds kfree(buf); 5411da177e4SLinus Torvalds out: 5423b68aaeaSTrond Myklebust dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 5431da177e4SLinus Torvalds return err; 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds static void 5471da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 5481da177e4SLinus Torvalds { 5491da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 5501da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5511da177e4SLinus Torvalds 5526e84c7b6STrond Myklebust spin_lock(&inode->i_lock); 5536e84c7b6STrond Myklebust while (!list_empty(&rpci->in_downcall)) { 5546e84c7b6STrond Myklebust 5556e84c7b6STrond Myklebust gss_msg = list_entry(rpci->in_downcall.next, 5561da177e4SLinus Torvalds struct gss_upcall_msg, list); 5571da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 5581da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5591da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 560b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5611da177e4SLinus Torvalds gss_release_msg(gss_msg); 562b185f835STrond Myklebust spin_lock(&inode->i_lock); 5631da177e4SLinus Torvalds } 564b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds static void 5681da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 5691da177e4SLinus Torvalds { 5701da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 5711da177e4SLinus Torvalds static unsigned long ratelimit; 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds if (msg->errno < 0) { 5741da177e4SLinus Torvalds dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 5751da177e4SLinus Torvalds gss_msg); 5761da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5771da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 57848e49187STrond Myklebust if (msg->errno == -ETIMEDOUT) { 5791da177e4SLinus Torvalds unsigned long now = jiffies; 5801da177e4SLinus Torvalds if (time_after(now, ratelimit)) { 5811da177e4SLinus Torvalds printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 5821da177e4SLinus Torvalds "Please check user daemon is running!\n"); 5831da177e4SLinus Torvalds ratelimit = now + 15*HZ; 5841da177e4SLinus Torvalds } 5851da177e4SLinus Torvalds } 5861da177e4SLinus Torvalds gss_release_msg(gss_msg); 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds /* 5911da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 5921da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 5931da177e4SLinus Torvalds */ 5941da177e4SLinus Torvalds static struct rpc_auth * 5951da177e4SLinus Torvalds gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 5961da177e4SLinus Torvalds { 5971da177e4SLinus Torvalds struct gss_auth *gss_auth; 5981da177e4SLinus Torvalds struct rpc_auth * auth; 5996a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 6046a19275aSJ. Bruce Fields return ERR_PTR(err); 6051da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 6061da177e4SLinus Torvalds goto out_dec; 6071da177e4SLinus Torvalds gss_auth->client = clnt; 6086a19275aSJ. Bruce Fields err = -EINVAL; 6091da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 6101da177e4SLinus Torvalds if (!gss_auth->mech) { 6113392c349SJames Morris printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", 6120dc47877SHarvey Harrison __func__, flavor); 6131da177e4SLinus Torvalds goto err_free; 6141da177e4SLinus Torvalds } 6151da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 616438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 617438b6fdeSJ. Bruce Fields goto err_put_mech; 6181da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 6191da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 6201da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 6211da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 6221da177e4SLinus Torvalds auth->au_flavor = flavor; 6231da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 6240285ed1fSTrond Myklebust kref_init(&gss_auth->kref); 6251da177e4SLinus Torvalds 626158998b6STrond Myklebust gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, 627158998b6STrond Myklebust clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 6286a19275aSJ. Bruce Fields if (IS_ERR(gss_auth->dentry)) { 6296a19275aSJ. Bruce Fields err = PTR_ERR(gss_auth->dentry); 6301da177e4SLinus Torvalds goto err_put_mech; 6316a19275aSJ. Bruce Fields } 6321da177e4SLinus Torvalds 633f5c2187cSTrond Myklebust err = rpcauth_init_credcache(auth); 63407a2bf1dSTrond Myklebust if (err) 63507a2bf1dSTrond Myklebust goto err_unlink_pipe; 63607a2bf1dSTrond Myklebust 6371da177e4SLinus Torvalds return auth; 63807a2bf1dSTrond Myklebust err_unlink_pipe: 63907a2bf1dSTrond Myklebust rpc_unlink(gss_auth->dentry); 6401da177e4SLinus Torvalds err_put_mech: 6411da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 6421da177e4SLinus Torvalds err_free: 6431da177e4SLinus Torvalds kfree(gss_auth); 6441da177e4SLinus Torvalds out_dec: 6451da177e4SLinus Torvalds module_put(THIS_MODULE); 6466a19275aSJ. Bruce Fields return ERR_PTR(err); 6471da177e4SLinus Torvalds } 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds static void 6500285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 6510285ed1fSTrond Myklebust { 6520285ed1fSTrond Myklebust rpc_unlink(gss_auth->dentry); 6530285ed1fSTrond Myklebust gss_auth->dentry = NULL; 6540285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 6550285ed1fSTrond Myklebust 6560285ed1fSTrond Myklebust kfree(gss_auth); 6570285ed1fSTrond Myklebust module_put(THIS_MODULE); 6580285ed1fSTrond Myklebust } 6590285ed1fSTrond Myklebust 6600285ed1fSTrond Myklebust static void 6610285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 6620285ed1fSTrond Myklebust { 6630285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 6640285ed1fSTrond Myklebust 6650285ed1fSTrond Myklebust gss_free(gss_auth); 6660285ed1fSTrond Myklebust } 6670285ed1fSTrond Myklebust 6680285ed1fSTrond Myklebust static void 6691da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 6701da177e4SLinus Torvalds { 6711da177e4SLinus Torvalds struct gss_auth *gss_auth; 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 6741da177e4SLinus Torvalds auth, auth->au_flavor); 6751da177e4SLinus Torvalds 6763ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 6773ab9bb72STrond Myklebust 6781da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 6790285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 6801da177e4SLinus Torvalds } 6811da177e4SLinus Torvalds 6820df7fb74STrond Myklebust /* 6830df7fb74STrond Myklebust * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 6840df7fb74STrond Myklebust * to the server with the GSS control procedure field set to 6850df7fb74STrond Myklebust * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 6860df7fb74STrond Myklebust * all RPCSEC_GSS state associated with that context. 6870df7fb74STrond Myklebust */ 6880df7fb74STrond Myklebust static int 6890df7fb74STrond Myklebust gss_destroying_context(struct rpc_cred *cred) 6900df7fb74STrond Myklebust { 6910df7fb74STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 6920df7fb74STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 6930df7fb74STrond Myklebust struct rpc_task *task; 6940df7fb74STrond Myklebust 6950df7fb74STrond Myklebust if (gss_cred->gc_ctx == NULL || 6966dcd3926SJeff Layton test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 6970df7fb74STrond Myklebust return 0; 6980df7fb74STrond Myklebust 6990df7fb74STrond Myklebust gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 7000df7fb74STrond Myklebust cred->cr_ops = &gss_nullops; 7010df7fb74STrond Myklebust 7020df7fb74STrond Myklebust /* Take a reference to ensure the cred will be destroyed either 7030df7fb74STrond Myklebust * by the RPC call or by the put_rpccred() below */ 7040df7fb74STrond Myklebust get_rpccred(cred); 7050df7fb74STrond Myklebust 706080a1f14STrond Myklebust task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 7070df7fb74STrond Myklebust if (!IS_ERR(task)) 7080df7fb74STrond Myklebust rpc_put_task(task); 7090df7fb74STrond Myklebust 7100df7fb74STrond Myklebust put_rpccred(cred); 7110df7fb74STrond Myklebust return 1; 7120df7fb74STrond Myklebust } 7130df7fb74STrond Myklebust 7140df7fb74STrond Myklebust /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 7151da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 7161da177e4SLinus Torvalds * allocated before freeing them. */ 7171da177e4SLinus Torvalds static void 7185d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 7191da177e4SLinus Torvalds { 7205d28dc82STrond Myklebust dprintk("RPC: gss_free_ctx\n"); 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 7231da177e4SLinus Torvalds kfree(ctx); 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds static void 7275d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 7285d28dc82STrond Myklebust { 7295d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 7305d28dc82STrond Myklebust gss_do_free_ctx(ctx); 7315d28dc82STrond Myklebust } 7325d28dc82STrond Myklebust 7335d28dc82STrond Myklebust static void 7345d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 7355d28dc82STrond Myklebust { 736a4deb81bSTrond Myklebust struct gss_ctx *gc_gss_ctx; 737a4deb81bSTrond Myklebust 738a4deb81bSTrond Myklebust gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); 739a4deb81bSTrond Myklebust rcu_assign_pointer(ctx->gc_gss_ctx, NULL); 7405d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 741a4deb81bSTrond Myklebust if (gc_gss_ctx) 742a4deb81bSTrond Myklebust gss_delete_sec_context(&gc_gss_ctx); 7435d28dc82STrond Myklebust } 7445d28dc82STrond Myklebust 7455d28dc82STrond Myklebust static void 74631be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 7471da177e4SLinus Torvalds { 74831be5bf1STrond Myklebust dprintk("RPC: gss_free_cred %p\n", gss_cred); 74931be5bf1STrond Myklebust kfree(gss_cred); 75031be5bf1STrond Myklebust } 7511da177e4SLinus Torvalds 75231be5bf1STrond Myklebust static void 75331be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 75431be5bf1STrond Myklebust { 75531be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 75631be5bf1STrond Myklebust gss_free_cred(gss_cred); 75731be5bf1STrond Myklebust } 7581da177e4SLinus Torvalds 75931be5bf1STrond Myklebust static void 7606dcd3926SJeff Layton gss_destroy_nullcred(struct rpc_cred *cred) 76131be5bf1STrond Myklebust { 7625d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 7630285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 7645d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 7655d28dc82STrond Myklebust 7665d28dc82STrond Myklebust rcu_assign_pointer(gss_cred->gc_ctx, NULL); 76731be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 7685d28dc82STrond Myklebust if (ctx) 7695d28dc82STrond Myklebust gss_put_ctx(ctx); 7700285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 7711da177e4SLinus Torvalds } 7721da177e4SLinus Torvalds 7736dcd3926SJeff Layton static void 7746dcd3926SJeff Layton gss_destroy_cred(struct rpc_cred *cred) 7756dcd3926SJeff Layton { 7766dcd3926SJeff Layton 7776dcd3926SJeff Layton if (gss_destroying_context(cred)) 7786dcd3926SJeff Layton return; 7796dcd3926SJeff Layton gss_destroy_nullcred(cred); 7806dcd3926SJeff Layton } 7816dcd3926SJeff Layton 7821da177e4SLinus Torvalds /* 7831da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 7841da177e4SLinus Torvalds */ 7851da177e4SLinus Torvalds static struct rpc_cred * 7868a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7871da177e4SLinus Torvalds { 7888a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 7891da177e4SLinus Torvalds } 7901da177e4SLinus Torvalds 7911da177e4SLinus Torvalds static struct rpc_cred * 7928a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7931da177e4SLinus Torvalds { 7941da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 7951da177e4SLinus Torvalds struct gss_cred *cred = NULL; 7961da177e4SLinus Torvalds int err = -ENOMEM; 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 7991da177e4SLinus Torvalds acred->uid, auth->au_flavor); 8001da177e4SLinus Torvalds 8010f38b873STrond Myklebust if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 8021da177e4SLinus Torvalds goto out_err; 8031da177e4SLinus Torvalds 8045fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 8051da177e4SLinus Torvalds /* 8061da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 8071da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 8081da177e4SLinus Torvalds */ 809fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 8101da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 8117c67db3aSTrond Myklebust cred->gc_machine_cred = acred->machine_cred; 8120285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 8131da177e4SLinus Torvalds return &cred->gc_base; 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvalds out_err: 8161da177e4SLinus Torvalds dprintk("RPC: gss_create_cred failed with error %d\n", err); 8171da177e4SLinus Torvalds return ERR_PTR(err); 8181da177e4SLinus Torvalds } 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds static int 821fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 822fba3bad4STrond Myklebust { 823fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 824fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 825fba3bad4STrond Myklebust int err; 826fba3bad4STrond Myklebust 827fba3bad4STrond Myklebust do { 828fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 829fba3bad4STrond Myklebust } while (err == -EAGAIN); 830fba3bad4STrond Myklebust return err; 831fba3bad4STrond Myklebust } 832fba3bad4STrond Myklebust 833fba3bad4STrond Myklebust static int 8348a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 8351da177e4SLinus Torvalds { 8361da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 8371da177e4SLinus Torvalds 838cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 8398a317760STrond Myklebust goto out; 8401da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 841cd019f75STrond Myklebust if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 842cd019f75STrond Myklebust return 0; 843cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 8441da177e4SLinus Torvalds return 0; 8458a317760STrond Myklebust out: 8467c67db3aSTrond Myklebust if (acred->machine_cred != gss_cred->gc_machine_cred) 8477c67db3aSTrond Myklebust return 0; 8481da177e4SLinus Torvalds return (rc->cr_uid == acred->uid); 8491da177e4SLinus Torvalds } 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds /* 8521da177e4SLinus Torvalds * Marshal credentials. 8531da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 8541da177e4SLinus Torvalds */ 855d8ed029dSAlexey Dobriyan static __be32 * 856d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 8571da177e4SLinus Torvalds { 8581da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 8591da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 8601da177e4SLinus Torvalds gc_base); 8611da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 862d8ed029dSAlexey Dobriyan __be32 *cred_len; 8631da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8641da177e4SLinus Torvalds u32 maj_stat = 0; 8651da177e4SLinus Torvalds struct xdr_netobj mic; 8661da177e4SLinus Torvalds struct kvec iov; 8671da177e4SLinus Torvalds struct xdr_buf verf_buf; 8681da177e4SLinus Torvalds 8698885cb36SChuck Lever dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8721da177e4SLinus Torvalds cred_len = p++; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 8751da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 8761da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 8791da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 8801da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 8811da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 8821da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 8831da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 8861da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 887808012fbSChuck Lever iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 888808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 8891da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 8901da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds /* set verifier flavor*/ 8931da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 89600fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 8971da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 898fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 8991da177e4SLinus Torvalds } else if (maj_stat != 0) { 9001da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 9011da177e4SLinus Torvalds goto out_put_ctx; 9021da177e4SLinus Torvalds } 9031da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 9041da177e4SLinus Torvalds gss_put_ctx(ctx); 9051da177e4SLinus Torvalds return p; 9061da177e4SLinus Torvalds out_put_ctx: 9071da177e4SLinus Torvalds gss_put_ctx(ctx); 9081da177e4SLinus Torvalds return NULL; 9091da177e4SLinus Torvalds } 9101da177e4SLinus Torvalds 911cd019f75STrond Myklebust static int gss_renew_cred(struct rpc_task *task) 912cd019f75STrond Myklebust { 913cd019f75STrond Myklebust struct rpc_cred *oldcred = task->tk_msg.rpc_cred; 914cd019f75STrond Myklebust struct gss_cred *gss_cred = container_of(oldcred, 915cd019f75STrond Myklebust struct gss_cred, 916cd019f75STrond Myklebust gc_base); 917cd019f75STrond Myklebust struct rpc_auth *auth = oldcred->cr_auth; 918cd019f75STrond Myklebust struct auth_cred acred = { 919cd019f75STrond Myklebust .uid = oldcred->cr_uid, 920cd019f75STrond Myklebust .machine_cred = gss_cred->gc_machine_cred, 921cd019f75STrond Myklebust }; 922cd019f75STrond Myklebust struct rpc_cred *new; 923cd019f75STrond Myklebust 924cd019f75STrond Myklebust new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 925cd019f75STrond Myklebust if (IS_ERR(new)) 926cd019f75STrond Myklebust return PTR_ERR(new); 927cd019f75STrond Myklebust task->tk_msg.rpc_cred = new; 928cd019f75STrond Myklebust put_rpccred(oldcred); 929cd019f75STrond Myklebust return 0; 930cd019f75STrond Myklebust } 931cd019f75STrond Myklebust 9321da177e4SLinus Torvalds /* 9331da177e4SLinus Torvalds * Refresh credentials. XXX - finish 9341da177e4SLinus Torvalds */ 9351da177e4SLinus Torvalds static int 9361da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 9371da177e4SLinus Torvalds { 938cd019f75STrond Myklebust struct rpc_cred *cred = task->tk_msg.rpc_cred; 939cd019f75STrond Myklebust int ret = 0; 9401da177e4SLinus Torvalds 941cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 942cd019f75STrond Myklebust !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 943cd019f75STrond Myklebust ret = gss_renew_cred(task); 944cd019f75STrond Myklebust if (ret < 0) 945cd019f75STrond Myklebust goto out; 946cd019f75STrond Myklebust cred = task->tk_msg.rpc_cred; 947cd019f75STrond Myklebust } 948cd019f75STrond Myklebust 949cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 950cd019f75STrond Myklebust ret = gss_refresh_upcall(task); 951cd019f75STrond Myklebust out: 952cd019f75STrond Myklebust return ret; 9531da177e4SLinus Torvalds } 9541da177e4SLinus Torvalds 9550df7fb74STrond Myklebust /* Dummy refresh routine: used only when destroying the context */ 9560df7fb74STrond Myklebust static int 9570df7fb74STrond Myklebust gss_refresh_null(struct rpc_task *task) 9580df7fb74STrond Myklebust { 9590df7fb74STrond Myklebust return -EACCES; 9600df7fb74STrond Myklebust } 9610df7fb74STrond Myklebust 962d8ed029dSAlexey Dobriyan static __be32 * 963d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 9641da177e4SLinus Torvalds { 9651da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 9661da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 967d8ed029dSAlexey Dobriyan __be32 seq; 9681da177e4SLinus Torvalds struct kvec iov; 9691da177e4SLinus Torvalds struct xdr_buf verf_buf; 9701da177e4SLinus Torvalds struct xdr_netobj mic; 9711da177e4SLinus Torvalds u32 flav,len; 9721da177e4SLinus Torvalds u32 maj_stat; 9731da177e4SLinus Torvalds 9748885cb36SChuck Lever dprintk("RPC: %5u gss_validate\n", task->tk_pid); 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds flav = ntohl(*p++); 9771da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 9781da177e4SLinus Torvalds goto out_bad; 9791da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 9801da177e4SLinus Torvalds goto out_bad; 9811da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 9821da177e4SLinus Torvalds iov.iov_base = &seq; 9831da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 9841da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 9851da177e4SLinus Torvalds mic.data = (u8 *)p; 9861da177e4SLinus Torvalds mic.len = len; 9871da177e4SLinus Torvalds 98800fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 9891da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 990fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 9910df7fb74STrond Myklebust if (maj_stat) { 9920df7fb74STrond Myklebust dprintk("RPC: %5u gss_validate: gss_verify_mic returned " 9930df7fb74STrond Myklebust "error 0x%08x\n", task->tk_pid, maj_stat); 9941da177e4SLinus Torvalds goto out_bad; 9950df7fb74STrond Myklebust } 99624b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 99724b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 9981be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 9991da177e4SLinus Torvalds gss_put_ctx(ctx); 10008885cb36SChuck Lever dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 10011da177e4SLinus Torvalds task->tk_pid); 10021da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 10031da177e4SLinus Torvalds out_bad: 10041da177e4SLinus Torvalds gss_put_ctx(ctx); 10058885cb36SChuck Lever dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 10061da177e4SLinus Torvalds return NULL; 10071da177e4SLinus Torvalds } 10081da177e4SLinus Torvalds 10091da177e4SLinus Torvalds static inline int 10101da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1011d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 10121da177e4SLinus Torvalds { 10131da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 10141da177e4SLinus Torvalds struct xdr_buf integ_buf; 1015d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 10161da177e4SLinus Torvalds struct xdr_netobj mic; 1017d8ed029dSAlexey Dobriyan u32 offset; 1018d8ed029dSAlexey Dobriyan __be32 *q; 10191da177e4SLinus Torvalds struct kvec *iov; 10201da177e4SLinus Torvalds u32 maj_stat = 0; 10211da177e4SLinus Torvalds int status = -EIO; 10221da177e4SLinus Torvalds 10231da177e4SLinus Torvalds integ_len = p++; 10241da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 10251da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 10261da177e4SLinus Torvalds 102788a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 10281da177e4SLinus Torvalds if (status) 10291da177e4SLinus Torvalds return status; 10301da177e4SLinus Torvalds 10311da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 10321da177e4SLinus Torvalds offset, snd_buf->len - offset)) 10331da177e4SLinus Torvalds return status; 10341da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 10371da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 10381da177e4SLinus Torvalds iov = snd_buf->tail; 10391da177e4SLinus Torvalds else 10401da177e4SLinus Torvalds iov = snd_buf->head; 10411da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 10421da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 10431da177e4SLinus Torvalds 104400fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 10451da177e4SLinus Torvalds status = -EIO; /* XXX? */ 10461da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1047fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 10481da177e4SLinus Torvalds else if (maj_stat) 10491da177e4SLinus Torvalds return status; 10501da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 10531da177e4SLinus Torvalds iov->iov_len += offset; 10541da177e4SLinus Torvalds snd_buf->len += offset; 10551da177e4SLinus Torvalds return 0; 10561da177e4SLinus Torvalds } 10571da177e4SLinus Torvalds 10582d2da60cSJ. Bruce Fields static void 10592d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 10602d2da60cSJ. Bruce Fields { 10612d2da60cSJ. Bruce Fields int i; 10622d2da60cSJ. Bruce Fields 10632d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 10642d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 10652d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 10662d2da60cSJ. Bruce Fields } 10672d2da60cSJ. Bruce Fields 10682d2da60cSJ. Bruce Fields static int 10692d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 10702d2da60cSJ. Bruce Fields { 10712d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 10722d2da60cSJ. Bruce Fields int first, last, i; 10732d2da60cSJ. Bruce Fields 10742d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 10752d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 10762d2da60cSJ. Bruce Fields return 0; 10772d2da60cSJ. Bruce Fields } 10782d2da60cSJ. Bruce Fields 10792d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 10802d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 10812d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 10822d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 10832d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 10842d2da60cSJ. Bruce Fields GFP_NOFS); 10852d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 10862d2da60cSJ. Bruce Fields goto out; 10872d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 10882d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 10892d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 10902d2da60cSJ. Bruce Fields goto out_free; 10912d2da60cSJ. Bruce Fields } 10922d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 10932d2da60cSJ. Bruce Fields return 0; 10942d2da60cSJ. Bruce Fields out_free: 10952d2da60cSJ. Bruce Fields for (i--; i >= 0; i--) { 10962d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 10972d2da60cSJ. Bruce Fields } 10982d2da60cSJ. Bruce Fields out: 10992d2da60cSJ. Bruce Fields return -EAGAIN; 11002d2da60cSJ. Bruce Fields } 11012d2da60cSJ. Bruce Fields 11022d2da60cSJ. Bruce Fields static inline int 11032d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1104d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 11052d2da60cSJ. Bruce Fields { 11062d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 11072d2da60cSJ. Bruce Fields u32 offset; 11082d2da60cSJ. Bruce Fields u32 maj_stat; 11092d2da60cSJ. Bruce Fields int status; 1110d8ed029dSAlexey Dobriyan __be32 *opaque_len; 11112d2da60cSJ. Bruce Fields struct page **inpages; 11122d2da60cSJ. Bruce Fields int first; 11132d2da60cSJ. Bruce Fields int pad; 11142d2da60cSJ. Bruce Fields struct kvec *iov; 11152d2da60cSJ. Bruce Fields char *tmp; 11162d2da60cSJ. Bruce Fields 11172d2da60cSJ. Bruce Fields opaque_len = p++; 11182d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 11192d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 11202d2da60cSJ. Bruce Fields 112188a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 11222d2da60cSJ. Bruce Fields if (status) 11232d2da60cSJ. Bruce Fields return status; 11242d2da60cSJ. Bruce Fields 11252d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 11262d2da60cSJ. Bruce Fields if (status) 11272d2da60cSJ. Bruce Fields return status; 11282d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 11292d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 11302d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 11312d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 11322d2da60cSJ. Bruce Fields /* Give the tail its own page, in case we need extra space in the 11332d2da60cSJ. Bruce Fields * head when wrapping: */ 11342d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 11352d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 11362d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 11372d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 11382d2da60cSJ. Bruce Fields } 113900fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 11402d2da60cSJ. Bruce Fields /* RPC_SLACK_SPACE should prevent this ever happening: */ 11412d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 11422d2da60cSJ. Bruce Fields status = -EIO; 11432d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 11442d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 11452d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1146fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11472d2da60cSJ. Bruce Fields else if (maj_stat) 11482d2da60cSJ. Bruce Fields return status; 11492d2da60cSJ. Bruce Fields 11502d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 11512d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 11522d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 11532d2da60cSJ. Bruce Fields iov = snd_buf->tail; 11542d2da60cSJ. Bruce Fields else 11552d2da60cSJ. Bruce Fields iov = snd_buf->head; 11562d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 11572d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 11582d2da60cSJ. Bruce Fields memset(p, 0, pad); 11592d2da60cSJ. Bruce Fields iov->iov_len += pad; 11602d2da60cSJ. Bruce Fields snd_buf->len += pad; 11612d2da60cSJ. Bruce Fields 11622d2da60cSJ. Bruce Fields return 0; 11632d2da60cSJ. Bruce Fields } 11642d2da60cSJ. Bruce Fields 11651da177e4SLinus Torvalds static int 11661da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 1167d8ed029dSAlexey Dobriyan kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 11681da177e4SLinus Torvalds { 11691da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 11701da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 11711da177e4SLinus Torvalds gc_base); 11721da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 11731da177e4SLinus Torvalds int status = -EIO; 11741da177e4SLinus Torvalds 11758885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 11761da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 11771da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 11781da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 11791da177e4SLinus Torvalds */ 118088a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 11811da177e4SLinus Torvalds goto out; 11821da177e4SLinus Torvalds } 11831da177e4SLinus Torvalds switch (gss_cred->gc_service) { 11841da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 118588a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 11861da177e4SLinus Torvalds break; 11871da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 11881da177e4SLinus Torvalds status = gss_wrap_req_integ(cred, ctx, encode, 11891da177e4SLinus Torvalds rqstp, p, obj); 11901da177e4SLinus Torvalds break; 11911da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 11922d2da60cSJ. Bruce Fields status = gss_wrap_req_priv(cred, ctx, encode, 11932d2da60cSJ. Bruce Fields rqstp, p, obj); 11941da177e4SLinus Torvalds break; 11951da177e4SLinus Torvalds } 11961da177e4SLinus Torvalds out: 11971da177e4SLinus Torvalds gss_put_ctx(ctx); 11988885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 11991da177e4SLinus Torvalds return status; 12001da177e4SLinus Torvalds } 12011da177e4SLinus Torvalds 12021da177e4SLinus Torvalds static inline int 12031da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1204d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 12051da177e4SLinus Torvalds { 12061da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 12071da177e4SLinus Torvalds struct xdr_buf integ_buf; 12081da177e4SLinus Torvalds struct xdr_netobj mic; 12091da177e4SLinus Torvalds u32 data_offset, mic_offset; 12101da177e4SLinus Torvalds u32 integ_len; 12111da177e4SLinus Torvalds u32 maj_stat; 12121da177e4SLinus Torvalds int status = -EIO; 12131da177e4SLinus Torvalds 12141da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 12151da177e4SLinus Torvalds if (integ_len & 3) 12161da177e4SLinus Torvalds return status; 12171da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 12181da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 12191da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 12201da177e4SLinus Torvalds return status; 12211da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 12221da177e4SLinus Torvalds return status; 12231da177e4SLinus Torvalds 12241da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 12251da177e4SLinus Torvalds mic_offset - data_offset)) 12261da177e4SLinus Torvalds return status; 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 12291da177e4SLinus Torvalds return status; 12301da177e4SLinus Torvalds 123100fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 12321da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1233fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 12341da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 12351da177e4SLinus Torvalds return status; 12361da177e4SLinus Torvalds return 0; 12371da177e4SLinus Torvalds } 12381da177e4SLinus Torvalds 12392d2da60cSJ. Bruce Fields static inline int 12402d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1241d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 12422d2da60cSJ. Bruce Fields { 12432d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 12442d2da60cSJ. Bruce Fields u32 offset; 12452d2da60cSJ. Bruce Fields u32 opaque_len; 12462d2da60cSJ. Bruce Fields u32 maj_stat; 12472d2da60cSJ. Bruce Fields int status = -EIO; 12482d2da60cSJ. Bruce Fields 12492d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 12502d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 12512d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 12522d2da60cSJ. Bruce Fields return status; 12532d2da60cSJ. Bruce Fields /* remove padding: */ 12542d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 12552d2da60cSJ. Bruce Fields 125600fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 12572d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1258fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 12592d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 12602d2da60cSJ. Bruce Fields return status; 12612d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 12622d2da60cSJ. Bruce Fields return status; 12632d2da60cSJ. Bruce Fields 12642d2da60cSJ. Bruce Fields return 0; 12652d2da60cSJ. Bruce Fields } 12662d2da60cSJ. Bruce Fields 12672d2da60cSJ. Bruce Fields 12681da177e4SLinus Torvalds static int 12691da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1270d8ed029dSAlexey Dobriyan kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 12711da177e4SLinus Torvalds { 12721da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 12731da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 12741da177e4SLinus Torvalds gc_base); 12751da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1276d8ed029dSAlexey Dobriyan __be32 *savedp = p; 12772d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 12782d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 12791da177e4SLinus Torvalds int status = -EIO; 12801da177e4SLinus Torvalds 12811da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 12821da177e4SLinus Torvalds goto out_decode; 12831da177e4SLinus Torvalds switch (gss_cred->gc_service) { 12841da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 12851da177e4SLinus Torvalds break; 12861da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 12871da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 12881da177e4SLinus Torvalds if (status) 12891da177e4SLinus Torvalds goto out; 12901da177e4SLinus Torvalds break; 12911da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 12922d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 12932d2da60cSJ. Bruce Fields if (status) 12942d2da60cSJ. Bruce Fields goto out; 12951da177e4SLinus Torvalds break; 12961da177e4SLinus Torvalds } 129724b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 12981be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 12992d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 13001da177e4SLinus Torvalds out_decode: 130188a9fe8cSTrond Myklebust status = decode(rqstp, p, obj); 13021da177e4SLinus Torvalds out: 13031da177e4SLinus Torvalds gss_put_ctx(ctx); 13048885cb36SChuck Lever dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 13051da177e4SLinus Torvalds status); 13061da177e4SLinus Torvalds return status; 13071da177e4SLinus Torvalds } 13081da177e4SLinus Torvalds 1309f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 13101da177e4SLinus Torvalds .owner = THIS_MODULE, 13111da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 13121da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 13131da177e4SLinus Torvalds .create = gss_create, 13141da177e4SLinus Torvalds .destroy = gss_destroy, 13151da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 13161da177e4SLinus Torvalds .crcreate = gss_create_cred 13171da177e4SLinus Torvalds }; 13181da177e4SLinus Torvalds 1319f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 13201da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 13211da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1322fba3bad4STrond Myklebust .cr_init = gss_cred_init, 13235c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 13241da177e4SLinus Torvalds .crmatch = gss_match, 13251da177e4SLinus Torvalds .crmarshal = gss_marshal, 13261da177e4SLinus Torvalds .crrefresh = gss_refresh, 13271da177e4SLinus Torvalds .crvalidate = gss_validate, 13281da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 13291da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 13301da177e4SLinus Torvalds }; 13311da177e4SLinus Torvalds 13320df7fb74STrond Myklebust static const struct rpc_credops gss_nullops = { 13330df7fb74STrond Myklebust .cr_name = "AUTH_GSS", 13346dcd3926SJeff Layton .crdestroy = gss_destroy_nullcred, 13355c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 13360df7fb74STrond Myklebust .crmatch = gss_match, 13370df7fb74STrond Myklebust .crmarshal = gss_marshal, 13380df7fb74STrond Myklebust .crrefresh = gss_refresh_null, 13390df7fb74STrond Myklebust .crvalidate = gss_validate, 13400df7fb74STrond Myklebust .crwrap_req = gss_wrap_req, 13410df7fb74STrond Myklebust .crunwrap_resp = gss_unwrap_resp, 13420df7fb74STrond Myklebust }; 13430df7fb74STrond Myklebust 13441da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops = { 13451da177e4SLinus Torvalds .upcall = gss_pipe_upcall, 13461da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 13471da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 13481da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 13491da177e4SLinus Torvalds }; 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds /* 13521da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 13531da177e4SLinus Torvalds */ 13541da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 13551da177e4SLinus Torvalds { 13561da177e4SLinus Torvalds int err = 0; 13571da177e4SLinus Torvalds 13581da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 13591da177e4SLinus Torvalds if (err) 13601da177e4SLinus Torvalds goto out; 13611da177e4SLinus Torvalds err = gss_svc_init(); 13621da177e4SLinus Torvalds if (err) 13631da177e4SLinus Torvalds goto out_unregister; 13641da177e4SLinus Torvalds return 0; 13651da177e4SLinus Torvalds out_unregister: 13661da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 13671da177e4SLinus Torvalds out: 13681da177e4SLinus Torvalds return err; 13691da177e4SLinus Torvalds } 13701da177e4SLinus Torvalds 13711da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 13721da177e4SLinus Torvalds { 13731da177e4SLinus Torvalds gss_svc_shutdown(); 13741da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 13751da177e4SLinus Torvalds } 13761da177e4SLinus Torvalds 13771da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 13781da177e4SLinus Torvalds module_init(init_rpcsec_gss) 13791da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1380