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; 7534769fc4S\"J. Bruce Fields\ /* 7634769fc4S\"J. Bruce Fields\ * There are two upcall pipes; dentry[1], named "gssd", is used 7734769fc4S\"J. Bruce Fields\ * for the new text-based upcall; dentry[0] is named after the 7834769fc4S\"J. Bruce Fields\ * mechanism (for example, "krb5") and exists for 7934769fc4S\"J. Bruce Fields\ * backwards-compatibility with older gssd's. 8034769fc4S\"J. Bruce Fields\ */ 8134769fc4S\"J. Bruce Fields\ struct dentry *dentry[2]; 821da177e4SLinus Torvalds }; 831da177e4SLinus Torvalds 8479a3f20bS\"J. Bruce Fields\ /* pipe_version >= 0 if and only if someone has a pipe open. */ 8579a3f20bS\"J. Bruce Fields\ static int pipe_version = -1; 86cf81939dS\"J. Bruce Fields\ static atomic_t pipe_users = ATOMIC_INIT(0); 8779a3f20bS\"J. Bruce Fields\ static DEFINE_SPINLOCK(pipe_version_lock); 8879a3f20bS\"J. Bruce Fields\ static struct rpc_wait_queue pipe_version_rpc_waitqueue; 8979a3f20bS\"J. Bruce Fields\ static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); 90cf81939dS\"J. Bruce Fields\ 915d28dc82STrond Myklebust static void gss_free_ctx(struct gss_cl_ctx *); 92b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0; 93b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1; 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds static inline struct gss_cl_ctx * 961da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 971da177e4SLinus Torvalds { 981da177e4SLinus Torvalds atomic_inc(&ctx->count); 991da177e4SLinus Torvalds return ctx; 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds static inline void 1031da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1065d28dc82STrond Myklebust gss_free_ctx(ctx); 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1095d28dc82STrond Myklebust /* gss_cred_set_ctx: 1105d28dc82STrond Myklebust * called by gss_upcall_callback and gss_create_upcall in order 1115d28dc82STrond Myklebust * to set the gss context. The actual exchange of an old context 1125d28dc82STrond Myklebust * and a new one is protected by the inode->i_lock. 1135d28dc82STrond Myklebust */ 1141da177e4SLinus Torvalds static void 1151da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1161da177e4SLinus Torvalds { 1171da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1185d28dc82STrond Myklebust 119cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 120cd019f75STrond Myklebust return; 1217b6962b0STrond Myklebust gss_get_ctx(ctx); 1225d28dc82STrond Myklebust rcu_assign_pointer(gss_cred->gc_ctx, ctx); 123fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 124cd019f75STrond Myklebust smp_mb__before_clear_bit(); 125fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds static const void * 1291da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1321da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1331da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1341da177e4SLinus Torvalds memcpy(res, p, len); 1351da177e4SLinus Torvalds return q; 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds static inline const void * 1391da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1401da177e4SLinus Torvalds { 1411da177e4SLinus Torvalds const void *q; 1421da177e4SLinus Torvalds unsigned int len; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1451da177e4SLinus Torvalds if (IS_ERR(p)) 1461da177e4SLinus Torvalds return p; 1471da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1481da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1491da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1500f38b873STrond Myklebust dest->data = kmemdup(p, len, GFP_NOFS); 1511da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1521da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1531da177e4SLinus Torvalds dest->len = len; 1541da177e4SLinus Torvalds return q; 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds static struct gss_cl_ctx * 1581da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1591da177e4SLinus Torvalds { 1601da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1611da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1621da177e4SLinus Torvalds 1635d28dc82STrond Myklebust rcu_read_lock(); 1641da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1651da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1665d28dc82STrond Myklebust rcu_read_unlock(); 1671da177e4SLinus Torvalds return ctx; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds static struct gss_cl_ctx * 1711da177e4SLinus Torvalds gss_alloc_context(void) 1721da177e4SLinus Torvalds { 1731da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1741da177e4SLinus Torvalds 1750f38b873STrond Myklebust ctx = kzalloc(sizeof(*ctx), GFP_NOFS); 1761da177e4SLinus Torvalds if (ctx != NULL) { 1771da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 1781da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 1791da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 1801da177e4SLinus Torvalds atomic_set(&ctx->count,1); 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds return ctx; 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 1861da177e4SLinus Torvalds static const void * 1871da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 1881da177e4SLinus Torvalds { 1891da177e4SLinus Torvalds const void *q; 1901da177e4SLinus Torvalds unsigned int seclen; 1911da177e4SLinus Torvalds unsigned int timeout; 1921da177e4SLinus Torvalds u32 window_size; 1931da177e4SLinus Torvalds int ret; 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds /* First unsigned int gives the lifetime (in seconds) of the cred */ 1961da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 1971da177e4SLinus Torvalds if (IS_ERR(p)) 1981da177e4SLinus Torvalds goto err; 1991da177e4SLinus Torvalds if (timeout == 0) 2001da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 2011da177e4SLinus Torvalds ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 2021da177e4SLinus Torvalds /* Sequence number window. Determines the maximum number of simultaneous requests */ 2031da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2041da177e4SLinus Torvalds if (IS_ERR(p)) 2051da177e4SLinus Torvalds goto err; 2061da177e4SLinus Torvalds ctx->gc_win = window_size; 2071da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2081da177e4SLinus Torvalds if (ctx->gc_win == 0) { 2091da177e4SLinus Torvalds /* in which case, p points to an error code which we ignore */ 2101da177e4SLinus Torvalds p = ERR_PTR(-EACCES); 2111da177e4SLinus Torvalds goto err; 2121da177e4SLinus Torvalds } 2131da177e4SLinus Torvalds /* copy the opaque wire context */ 2141da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2151da177e4SLinus Torvalds if (IS_ERR(p)) 2161da177e4SLinus Torvalds goto err; 2171da177e4SLinus Torvalds /* import the opaque security context */ 2181da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2191da177e4SLinus Torvalds if (IS_ERR(p)) 2201da177e4SLinus Torvalds goto err; 2211da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2221da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2231da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2241da177e4SLinus Torvalds goto err; 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 2271da177e4SLinus Torvalds if (ret < 0) { 2281da177e4SLinus Torvalds p = ERR_PTR(ret); 2291da177e4SLinus Torvalds goto err; 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds return q; 2321da177e4SLinus Torvalds err: 2331da177e4SLinus Torvalds dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 2341da177e4SLinus Torvalds return p; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 23734769fc4S\"J. Bruce Fields\ #define UPCALL_BUF_LEN 128 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds struct gss_upcall_msg { 2401da177e4SLinus Torvalds atomic_t count; 2411da177e4SLinus Torvalds uid_t uid; 2421da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2431da177e4SLinus Torvalds struct list_head list; 2441da177e4SLinus Torvalds struct gss_auth *auth; 2455b7ddd4aS\"J. Bruce Fields\ struct rpc_inode *inode; 2461da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2471da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2481da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 24934769fc4S\"J. Bruce Fields\ char databuf[UPCALL_BUF_LEN]; 2501da177e4SLinus Torvalds }; 2511da177e4SLinus Torvalds 25279a3f20bS\"J. Bruce Fields\ static int get_pipe_version(void) 25379a3f20bS\"J. Bruce Fields\ { 25479a3f20bS\"J. Bruce Fields\ int ret; 25579a3f20bS\"J. Bruce Fields\ 25679a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 25779a3f20bS\"J. Bruce Fields\ if (pipe_version >= 0) { 25879a3f20bS\"J. Bruce Fields\ atomic_inc(&pipe_users); 25934769fc4S\"J. Bruce Fields\ ret = pipe_version; 26079a3f20bS\"J. Bruce Fields\ } else 26179a3f20bS\"J. Bruce Fields\ ret = -EAGAIN; 26279a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 26379a3f20bS\"J. Bruce Fields\ return ret; 26479a3f20bS\"J. Bruce Fields\ } 26579a3f20bS\"J. Bruce Fields\ 26679a3f20bS\"J. Bruce Fields\ static void put_pipe_version(void) 26779a3f20bS\"J. Bruce Fields\ { 26879a3f20bS\"J. Bruce Fields\ if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) { 26979a3f20bS\"J. Bruce Fields\ pipe_version = -1; 27079a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 27179a3f20bS\"J. Bruce Fields\ } 27279a3f20bS\"J. Bruce Fields\ } 27379a3f20bS\"J. Bruce Fields\ 2741da177e4SLinus Torvalds static void 2751da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 2761da177e4SLinus Torvalds { 2771da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 2781da177e4SLinus Torvalds return; 27979a3f20bS\"J. Bruce Fields\ put_pipe_version(); 2801da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 2811da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 2821da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 283f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 2841da177e4SLinus Torvalds kfree(gss_msg); 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds static struct gss_upcall_msg * 2886e84c7b6STrond Myklebust __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 2891da177e4SLinus Torvalds { 2901da177e4SLinus Torvalds struct gss_upcall_msg *pos; 2916e84c7b6STrond Myklebust list_for_each_entry(pos, &rpci->in_downcall, list) { 2921da177e4SLinus Torvalds if (pos->uid != uid) 2931da177e4SLinus Torvalds continue; 2941da177e4SLinus Torvalds atomic_inc(&pos->count); 2951da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found msg %p\n", pos); 2961da177e4SLinus Torvalds return pos; 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found nothing\n"); 2991da177e4SLinus Torvalds return NULL; 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds 302720b8f2dS\\\"J. Bruce Fields\\\ /* Try to add an upcall to the pipefs queue. 3031da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 3041da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 3051da177e4SLinus Torvalds */ 3061da177e4SLinus Torvalds static inline struct gss_upcall_msg * 307053e324fSSuresh Jayaraman gss_add_msg(struct gss_upcall_msg *gss_msg) 3081da177e4SLinus Torvalds { 3095b7ddd4aS\"J. Bruce Fields\ struct rpc_inode *rpci = gss_msg->inode; 3105b7ddd4aS\"J. Bruce Fields\ struct inode *inode = &rpci->vfs_inode; 3111da177e4SLinus Torvalds struct gss_upcall_msg *old; 3121da177e4SLinus Torvalds 313b185f835STrond Myklebust spin_lock(&inode->i_lock); 3146e84c7b6STrond Myklebust old = __gss_find_upcall(rpci, gss_msg->uid); 3151da177e4SLinus Torvalds if (old == NULL) { 3161da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3176e84c7b6STrond Myklebust list_add(&gss_msg->list, &rpci->in_downcall); 3181da177e4SLinus Torvalds } else 3191da177e4SLinus Torvalds gss_msg = old; 320b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3211da177e4SLinus Torvalds return gss_msg; 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds static void 3251da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3261da177e4SLinus Torvalds { 3271da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3281da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3291da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3301da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds static void 3341da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3351da177e4SLinus Torvalds { 3365b7ddd4aS\"J. Bruce Fields\ struct inode *inode = &gss_msg->inode->vfs_inode; 3371da177e4SLinus Torvalds 3383b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3393b68aaeaSTrond Myklebust return; 340b185f835STrond Myklebust spin_lock(&inode->i_lock); 3413b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3421da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 343b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds static void 3471da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 3481da177e4SLinus Torvalds { 3491da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 3501da177e4SLinus Torvalds struct gss_cred, gc_base); 3511da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 3525b7ddd4aS\"J. Bruce Fields\ struct inode *inode = &gss_msg->inode->vfs_inode; 3531da177e4SLinus Torvalds 3545d28dc82STrond Myklebust spin_lock(&inode->i_lock); 3551da177e4SLinus Torvalds if (gss_msg->ctx) 3567b6962b0STrond Myklebust gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 3571da177e4SLinus Torvalds else 3581da177e4SLinus Torvalds task->tk_status = gss_msg->msg.errno; 3591da177e4SLinus Torvalds gss_cred->gc_upcall = NULL; 3601da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 361b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3621da177e4SLinus Torvalds gss_release_msg(gss_msg); 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds 36534769fc4S\"J. Bruce Fields\ static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) 36634769fc4S\"J. Bruce Fields\ { 36734769fc4S\"J. Bruce Fields\ gss_msg->msg.data = &gss_msg->uid; 36834769fc4S\"J. Bruce Fields\ gss_msg->msg.len = sizeof(gss_msg->uid); 36934769fc4S\"J. Bruce Fields\ } 37034769fc4S\"J. Bruce Fields\ 3718b1c7bf5SOlga Kornievskaia static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, 3722efef708SOlga Kornievskaia struct rpc_clnt *clnt, int machine_cred) 37334769fc4S\"J. Bruce Fields\ { 3748b1c7bf5SOlga Kornievskaia char *p = gss_msg->databuf; 3758b1c7bf5SOlga Kornievskaia int len = 0; 3768b1c7bf5SOlga Kornievskaia 3778b1c7bf5SOlga Kornievskaia gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", 37834769fc4S\"J. Bruce Fields\ gss_msg->auth->mech->gm_name, 37934769fc4S\"J. Bruce Fields\ gss_msg->uid); 3808b1c7bf5SOlga Kornievskaia p += gss_msg->msg.len; 3818b1c7bf5SOlga Kornievskaia if (clnt->cl_principal) { 3828b1c7bf5SOlga Kornievskaia len = sprintf(p, "target=%s ", clnt->cl_principal); 3838b1c7bf5SOlga Kornievskaia p += len; 3848b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 3858b1c7bf5SOlga Kornievskaia } 3862efef708SOlga Kornievskaia if (machine_cred) { 3872efef708SOlga Kornievskaia len = sprintf(p, "service=* "); 3882efef708SOlga Kornievskaia p += len; 3892efef708SOlga Kornievskaia gss_msg->msg.len += len; 3902efef708SOlga Kornievskaia } else if (!strcmp(clnt->cl_program->name, "nfs4_cb")) { 3912efef708SOlga Kornievskaia len = sprintf(p, "service=nfs "); 3922efef708SOlga Kornievskaia p += len; 3932efef708SOlga Kornievskaia gss_msg->msg.len += len; 3942efef708SOlga Kornievskaia } 3958b1c7bf5SOlga Kornievskaia len = sprintf(p, "\n"); 3968b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 3978b1c7bf5SOlga Kornievskaia 39834769fc4S\"J. Bruce Fields\ gss_msg->msg.data = gss_msg->databuf; 39934769fc4S\"J. Bruce Fields\ BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); 40034769fc4S\"J. Bruce Fields\ } 40134769fc4S\"J. Bruce Fields\ 4028b1c7bf5SOlga Kornievskaia static void gss_encode_msg(struct gss_upcall_msg *gss_msg, 4032efef708SOlga Kornievskaia struct rpc_clnt *clnt, int machine_cred) 40434769fc4S\"J. Bruce Fields\ { 40534769fc4S\"J. Bruce Fields\ if (pipe_version == 0) 40634769fc4S\"J. Bruce Fields\ gss_encode_v0_msg(gss_msg); 40734769fc4S\"J. Bruce Fields\ else /* pipe_version == 1 */ 4082efef708SOlga Kornievskaia gss_encode_v1_msg(gss_msg, clnt, machine_cred); 40934769fc4S\"J. Bruce Fields\ } 41034769fc4S\"J. Bruce Fields\ 4111da177e4SLinus Torvalds static inline struct gss_upcall_msg * 4122efef708SOlga Kornievskaia gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt, 4132efef708SOlga Kornievskaia int machine_cred) 4141da177e4SLinus Torvalds { 4151da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 41679a3f20bS\"J. Bruce Fields\ int vers; 4171da177e4SLinus Torvalds 4180f38b873STrond Myklebust gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 419db75b3d6S\"J. Bruce Fields\ if (gss_msg == NULL) 420db75b3d6S\"J. Bruce Fields\ return ERR_PTR(-ENOMEM); 42179a3f20bS\"J. Bruce Fields\ vers = get_pipe_version(); 42279a3f20bS\"J. Bruce Fields\ if (vers < 0) { 42379a3f20bS\"J. Bruce Fields\ kfree(gss_msg); 42479a3f20bS\"J. Bruce Fields\ return ERR_PTR(vers); 42579a3f20bS\"J. Bruce Fields\ } 42634769fc4S\"J. Bruce Fields\ gss_msg->inode = RPC_I(gss_auth->dentry[vers]->d_inode); 4271da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 4281da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 4291da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 4301da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 4311da177e4SLinus Torvalds gss_msg->uid = uid; 4321da177e4SLinus Torvalds gss_msg->auth = gss_auth; 4332efef708SOlga Kornievskaia gss_encode_msg(gss_msg, clnt, machine_cred); 4341da177e4SLinus Torvalds return gss_msg; 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds static struct gss_upcall_msg * 4381da177e4SLinus Torvalds gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 4391da177e4SLinus Torvalds { 4407c67db3aSTrond Myklebust struct gss_cred *gss_cred = container_of(cred, 4417c67db3aSTrond Myklebust struct gss_cred, gc_base); 4421da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 4437c67db3aSTrond Myklebust uid_t uid = cred->cr_uid; 4441da177e4SLinus Torvalds 4452efef708SOlga Kornievskaia gss_new = gss_alloc_msg(gss_auth, uid, clnt, gss_cred->gc_machine_cred); 446db75b3d6S\"J. Bruce Fields\ if (IS_ERR(gss_new)) 447db75b3d6S\"J. Bruce Fields\ return gss_new; 448053e324fSSuresh Jayaraman gss_msg = gss_add_msg(gss_new); 4491da177e4SLinus Torvalds if (gss_msg == gss_new) { 4505b7ddd4aS\"J. Bruce Fields\ struct inode *inode = &gss_new->inode->vfs_inode; 4515b7ddd4aS\"J. Bruce Fields\ int res = rpc_queue_upcall(inode, &gss_new->msg); 4521da177e4SLinus Torvalds if (res) { 4531da177e4SLinus Torvalds gss_unhash_msg(gss_new); 4541da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 4551da177e4SLinus Torvalds } 4561da177e4SLinus Torvalds } else 4571da177e4SLinus Torvalds gss_release_msg(gss_new); 4581da177e4SLinus Torvalds return gss_msg; 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 461b03568c3S\"J. Bruce Fields\ static void warn_gssd(void) 462b03568c3S\"J. Bruce Fields\ { 463b03568c3S\"J. Bruce Fields\ static unsigned long ratelimit; 464b03568c3S\"J. Bruce Fields\ unsigned long now = jiffies; 465b03568c3S\"J. Bruce Fields\ 466b03568c3S\"J. Bruce Fields\ if (time_after(now, ratelimit)) { 467b03568c3S\"J. Bruce Fields\ printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 468b03568c3S\"J. Bruce Fields\ "Please check user daemon is running.\n"); 469b03568c3S\"J. Bruce Fields\ ratelimit = now + 15*HZ; 470b03568c3S\"J. Bruce Fields\ } 471b03568c3S\"J. Bruce Fields\ } 472b03568c3S\"J. Bruce Fields\ 4731da177e4SLinus Torvalds static inline int 4741da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 4751da177e4SLinus Torvalds { 4761da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 4774a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 4781da177e4SLinus Torvalds struct gss_auth, rpc_auth); 4791da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 4801da177e4SLinus Torvalds struct gss_cred, gc_base); 4811da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 4825b7ddd4aS\"J. Bruce Fields\ struct inode *inode; 4831da177e4SLinus Torvalds int err = 0; 4841da177e4SLinus Torvalds 4858885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 4868885cb36SChuck Lever cred->cr_uid); 4871da177e4SLinus Torvalds gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 488480e3243SRoel Kluin if (PTR_ERR(gss_msg) == -EAGAIN) { 48979a3f20bS\"J. Bruce Fields\ /* XXX: warning on the first, under the assumption we 49079a3f20bS\"J. Bruce Fields\ * shouldn't normally hit this case on a refresh. */ 49179a3f20bS\"J. Bruce Fields\ warn_gssd(); 49279a3f20bS\"J. Bruce Fields\ task->tk_timeout = 15*HZ; 49379a3f20bS\"J. Bruce Fields\ rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); 49479a3f20bS\"J. Bruce Fields\ return 0; 49579a3f20bS\"J. Bruce Fields\ } 4961da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4971da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4981da177e4SLinus Torvalds goto out; 4991da177e4SLinus Torvalds } 5005b7ddd4aS\"J. Bruce Fields\ inode = &gss_msg->inode->vfs_inode; 501b185f835STrond Myklebust spin_lock(&inode->i_lock); 5021da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 5035d00837bSTrond Myklebust rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 5047b6962b0STrond Myklebust else if (gss_msg->ctx != NULL) { 5057b6962b0STrond Myklebust gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 5067b6962b0STrond Myklebust gss_cred->gc_upcall = NULL; 5077b6962b0STrond Myklebust rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 5087b6962b0STrond Myklebust } else if (gss_msg->msg.errno >= 0) { 5091da177e4SLinus Torvalds task->tk_timeout = 0; 5101da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 5111da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 5121da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5135d00837bSTrond Myklebust rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 5141da177e4SLinus Torvalds } else 5151da177e4SLinus Torvalds err = gss_msg->msg.errno; 516b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5171da177e4SLinus Torvalds gss_release_msg(gss_msg); 5181da177e4SLinus Torvalds out: 5198885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 5208885cb36SChuck Lever task->tk_pid, cred->cr_uid, err); 5211da177e4SLinus Torvalds return err; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds static inline int 5251da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 5261da177e4SLinus Torvalds { 5275b7ddd4aS\"J. Bruce Fields\ struct inode *inode; 5281da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 5291da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5301da177e4SLinus Torvalds DEFINE_WAIT(wait); 5311da177e4SLinus Torvalds int err = 0; 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 53479a3f20bS\"J. Bruce Fields\ retry: 5351da177e4SLinus Torvalds gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 53679a3f20bS\"J. Bruce Fields\ if (PTR_ERR(gss_msg) == -EAGAIN) { 53779a3f20bS\"J. Bruce Fields\ err = wait_event_interruptible_timeout(pipe_version_waitqueue, 53879a3f20bS\"J. Bruce Fields\ pipe_version >= 0, 15*HZ); 53979a3f20bS\"J. Bruce Fields\ if (err) 54079a3f20bS\"J. Bruce Fields\ goto out; 54179a3f20bS\"J. Bruce Fields\ if (pipe_version < 0) 54279a3f20bS\"J. Bruce Fields\ warn_gssd(); 54379a3f20bS\"J. Bruce Fields\ goto retry; 54479a3f20bS\"J. Bruce Fields\ } 5451da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 5461da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 5471da177e4SLinus Torvalds goto out; 5481da177e4SLinus Torvalds } 5495b7ddd4aS\"J. Bruce Fields\ inode = &gss_msg->inode->vfs_inode; 5501da177e4SLinus Torvalds for (;;) { 5511da177e4SLinus Torvalds prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 552b185f835STrond Myklebust spin_lock(&inode->i_lock); 5531da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 5541da177e4SLinus Torvalds break; 5551da177e4SLinus Torvalds } 556b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5571da177e4SLinus Torvalds if (signalled()) { 5581da177e4SLinus Torvalds err = -ERESTARTSYS; 5591da177e4SLinus Torvalds goto out_intr; 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds schedule(); 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds if (gss_msg->ctx) 5647b6962b0STrond Myklebust gss_cred_set_ctx(cred, gss_msg->ctx); 5651da177e4SLinus Torvalds else 5661da177e4SLinus Torvalds err = gss_msg->msg.errno; 5675d28dc82STrond Myklebust spin_unlock(&inode->i_lock); 5681da177e4SLinus Torvalds out_intr: 5691da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 5701da177e4SLinus Torvalds gss_release_msg(gss_msg); 5711da177e4SLinus Torvalds out: 5728885cb36SChuck Lever dprintk("RPC: gss_create_upcall for uid %u result %d\n", 5738885cb36SChuck Lever cred->cr_uid, err); 5741da177e4SLinus Torvalds return err; 5751da177e4SLinus Torvalds } 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds static ssize_t 5781da177e4SLinus Torvalds gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 5791da177e4SLinus Torvalds char __user *dst, size_t buflen) 5801da177e4SLinus Torvalds { 5811da177e4SLinus Torvalds char *data = (char *)msg->data + msg->copied; 5827df08995SChuck Lever size_t mlen = min(msg->len, buflen); 5837df08995SChuck Lever unsigned long left; 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds left = copy_to_user(dst, data, mlen); 5867df08995SChuck Lever if (left == mlen) { 5877df08995SChuck Lever msg->errno = -EFAULT; 5887df08995SChuck Lever return -EFAULT; 5891da177e4SLinus Torvalds } 5907df08995SChuck Lever 5911da177e4SLinus Torvalds mlen -= left; 5921da177e4SLinus Torvalds msg->copied += mlen; 5931da177e4SLinus Torvalds msg->errno = 0; 5941da177e4SLinus Torvalds return mlen; 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds static ssize_t 6001da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 6011da177e4SLinus Torvalds { 6021da177e4SLinus Torvalds const void *p, *end; 6031da177e4SLinus Torvalds void *buf; 6041da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 605b185f835STrond Myklebust struct inode *inode = filp->f_path.dentry->d_inode; 6061da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 6071da177e4SLinus Torvalds uid_t uid; 6083b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 6111da177e4SLinus Torvalds goto out; 6121da177e4SLinus Torvalds err = -ENOMEM; 6130f38b873STrond Myklebust buf = kmalloc(mlen, GFP_NOFS); 6141da177e4SLinus Torvalds if (!buf) 6151da177e4SLinus Torvalds goto out; 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds err = -EFAULT; 6181da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 6191da177e4SLinus Torvalds goto err; 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 6221da177e4SLinus Torvalds p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 6231da177e4SLinus Torvalds if (IS_ERR(p)) { 6241da177e4SLinus Torvalds err = PTR_ERR(p); 6251da177e4SLinus Torvalds goto err; 6261da177e4SLinus Torvalds } 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds err = -ENOMEM; 6291da177e4SLinus Torvalds ctx = gss_alloc_context(); 6301da177e4SLinus Torvalds if (ctx == NULL) 6311da177e4SLinus Torvalds goto err; 6323b68aaeaSTrond Myklebust 6333b68aaeaSTrond Myklebust err = -ENOENT; 6343b68aaeaSTrond Myklebust /* Find a matching upcall */ 6353b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 6366e84c7b6STrond Myklebust gss_msg = __gss_find_upcall(RPC_I(inode), uid); 6373b68aaeaSTrond Myklebust if (gss_msg == NULL) { 6383b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 6393b68aaeaSTrond Myklebust goto err_put_ctx; 6403b68aaeaSTrond Myklebust } 6413b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 6423b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 6433b68aaeaSTrond Myklebust 6446e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 6451da177e4SLinus Torvalds if (IS_ERR(p)) { 6461da177e4SLinus Torvalds err = PTR_ERR(p); 647486bad2eSJeff Layton switch (err) { 648486bad2eSJeff Layton case -EACCES: 649486bad2eSJeff Layton gss_msg->msg.errno = err; 650486bad2eSJeff Layton err = mlen; 651486bad2eSJeff Layton break; 652486bad2eSJeff Layton case -EFAULT: 653486bad2eSJeff Layton case -ENOMEM: 654486bad2eSJeff Layton case -EINVAL: 655486bad2eSJeff Layton case -ENOSYS: 656486bad2eSJeff Layton gss_msg->msg.errno = -EAGAIN; 657486bad2eSJeff Layton break; 658486bad2eSJeff Layton default: 659486bad2eSJeff Layton printk(KERN_CRIT "%s: bad return from " 6606c853099SRandy Dunlap "gss_fill_context: %zd\n", __func__, err); 661486bad2eSJeff Layton BUG(); 662486bad2eSJeff Layton } 6633b68aaeaSTrond Myklebust goto err_release_msg; 6641da177e4SLinus Torvalds } 6651da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 6663b68aaeaSTrond Myklebust err = mlen; 6673b68aaeaSTrond Myklebust 6683b68aaeaSTrond Myklebust err_release_msg: 6693b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 6701da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 671b185f835STrond Myklebust spin_unlock(&inode->i_lock); 6721da177e4SLinus Torvalds gss_release_msg(gss_msg); 6731da177e4SLinus Torvalds err_put_ctx: 6741da177e4SLinus Torvalds gss_put_ctx(ctx); 6751da177e4SLinus Torvalds err: 6761da177e4SLinus Torvalds kfree(buf); 6771da177e4SLinus Torvalds out: 6783b68aaeaSTrond Myklebust dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 6791da177e4SLinus Torvalds return err; 6801da177e4SLinus Torvalds } 6811da177e4SLinus Torvalds 68234769fc4S\"J. Bruce Fields\ static int gss_pipe_open(struct inode *inode, int new_version) 683cf81939dS\"J. Bruce Fields\ { 68434769fc4S\"J. Bruce Fields\ int ret = 0; 68534769fc4S\"J. Bruce Fields\ 68679a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 68779a3f20bS\"J. Bruce Fields\ if (pipe_version < 0) { 68834769fc4S\"J. Bruce Fields\ /* First open of any gss pipe determines the version: */ 68934769fc4S\"J. Bruce Fields\ pipe_version = new_version; 69079a3f20bS\"J. Bruce Fields\ rpc_wake_up(&pipe_version_rpc_waitqueue); 69179a3f20bS\"J. Bruce Fields\ wake_up(&pipe_version_waitqueue); 69234769fc4S\"J. Bruce Fields\ } else if (pipe_version != new_version) { 69334769fc4S\"J. Bruce Fields\ /* Trying to open a pipe of a different version */ 69434769fc4S\"J. Bruce Fields\ ret = -EBUSY; 69534769fc4S\"J. Bruce Fields\ goto out; 69679a3f20bS\"J. Bruce Fields\ } 697cf81939dS\"J. Bruce Fields\ atomic_inc(&pipe_users); 69834769fc4S\"J. Bruce Fields\ out: 69979a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 70034769fc4S\"J. Bruce Fields\ return ret; 70134769fc4S\"J. Bruce Fields\ 70234769fc4S\"J. Bruce Fields\ } 70334769fc4S\"J. Bruce Fields\ 70434769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v0(struct inode *inode) 70534769fc4S\"J. Bruce Fields\ { 70634769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 0); 70734769fc4S\"J. Bruce Fields\ } 70834769fc4S\"J. Bruce Fields\ 70934769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v1(struct inode *inode) 71034769fc4S\"J. Bruce Fields\ { 71134769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 1); 712cf81939dS\"J. Bruce Fields\ } 713cf81939dS\"J. Bruce Fields\ 7141da177e4SLinus Torvalds static void 7151da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 7161da177e4SLinus Torvalds { 7171da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 7181da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 7191da177e4SLinus Torvalds 7206e84c7b6STrond Myklebust spin_lock(&inode->i_lock); 7216e84c7b6STrond Myklebust while (!list_empty(&rpci->in_downcall)) { 7226e84c7b6STrond Myklebust 7236e84c7b6STrond Myklebust gss_msg = list_entry(rpci->in_downcall.next, 7241da177e4SLinus Torvalds struct gss_upcall_msg, list); 7251da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 7261da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 7271da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 728b185f835STrond Myklebust spin_unlock(&inode->i_lock); 7291da177e4SLinus Torvalds gss_release_msg(gss_msg); 730b185f835STrond Myklebust spin_lock(&inode->i_lock); 7311da177e4SLinus Torvalds } 732b185f835STrond Myklebust spin_unlock(&inode->i_lock); 733cf81939dS\"J. Bruce Fields\ 73479a3f20bS\"J. Bruce Fields\ put_pipe_version(); 7351da177e4SLinus Torvalds } 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds static void 7381da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 7391da177e4SLinus Torvalds { 7401da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds if (msg->errno < 0) { 7431da177e4SLinus Torvalds dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 7441da177e4SLinus Torvalds gss_msg); 7451da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 7461da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 747b03568c3S\"J. Bruce Fields\ if (msg->errno == -ETIMEDOUT) 748b03568c3S\"J. Bruce Fields\ warn_gssd(); 7491da177e4SLinus Torvalds gss_release_msg(gss_msg); 7501da177e4SLinus Torvalds } 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds /* 7541da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 7551da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 7561da177e4SLinus Torvalds */ 7571da177e4SLinus Torvalds static struct rpc_auth * 7581da177e4SLinus Torvalds gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 7591da177e4SLinus Torvalds { 7601da177e4SLinus Torvalds struct gss_auth *gss_auth; 7611da177e4SLinus Torvalds struct rpc_auth * auth; 7626a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 7676a19275aSJ. Bruce Fields return ERR_PTR(err); 7681da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 7691da177e4SLinus Torvalds goto out_dec; 7701da177e4SLinus Torvalds gss_auth->client = clnt; 7716a19275aSJ. Bruce Fields err = -EINVAL; 7721da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 7731da177e4SLinus Torvalds if (!gss_auth->mech) { 7743392c349SJames Morris printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", 7750dc47877SHarvey Harrison __func__, flavor); 7761da177e4SLinus Torvalds goto err_free; 7771da177e4SLinus Torvalds } 7781da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 779438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 780438b6fdeSJ. Bruce Fields goto err_put_mech; 7811da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 7821da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 7831da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 7841da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 7851da177e4SLinus Torvalds auth->au_flavor = flavor; 7861da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 7870285ed1fSTrond Myklebust kref_init(&gss_auth->kref); 7881da177e4SLinus Torvalds 78934769fc4S\"J. Bruce Fields\ /* 79034769fc4S\"J. Bruce Fields\ * Note: if we created the old pipe first, then someone who 79134769fc4S\"J. Bruce Fields\ * examined the directory at the right moment might conclude 79234769fc4S\"J. Bruce Fields\ * that we supported only the old pipe. So we instead create 79334769fc4S\"J. Bruce Fields\ * the new pipe first. 79434769fc4S\"J. Bruce Fields\ */ 7957d217cacSTrond Myklebust gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry, 79634769fc4S\"J. Bruce Fields\ "gssd", 79734769fc4S\"J. Bruce Fields\ clnt, &gss_upcall_ops_v1, 79834769fc4S\"J. Bruce Fields\ RPC_PIPE_WAIT_FOR_OPEN); 79934769fc4S\"J. Bruce Fields\ if (IS_ERR(gss_auth->dentry[1])) { 80034769fc4S\"J. Bruce Fields\ err = PTR_ERR(gss_auth->dentry[1]); 8011da177e4SLinus Torvalds goto err_put_mech; 8026a19275aSJ. Bruce Fields } 8031da177e4SLinus Torvalds 8047d217cacSTrond Myklebust gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry, 80534769fc4S\"J. Bruce Fields\ gss_auth->mech->gm_name, 80634769fc4S\"J. Bruce Fields\ clnt, &gss_upcall_ops_v0, 80734769fc4S\"J. Bruce Fields\ RPC_PIPE_WAIT_FOR_OPEN); 80834769fc4S\"J. Bruce Fields\ if (IS_ERR(gss_auth->dentry[0])) { 80934769fc4S\"J. Bruce Fields\ err = PTR_ERR(gss_auth->dentry[0]); 81034769fc4S\"J. Bruce Fields\ goto err_unlink_pipe_1; 81134769fc4S\"J. Bruce Fields\ } 812f5c2187cSTrond Myklebust err = rpcauth_init_credcache(auth); 81307a2bf1dSTrond Myklebust if (err) 81434769fc4S\"J. Bruce Fields\ goto err_unlink_pipe_0; 81507a2bf1dSTrond Myklebust 8161da177e4SLinus Torvalds return auth; 81734769fc4S\"J. Bruce Fields\ err_unlink_pipe_0: 81834769fc4S\"J. Bruce Fields\ rpc_unlink(gss_auth->dentry[0]); 81934769fc4S\"J. Bruce Fields\ err_unlink_pipe_1: 82034769fc4S\"J. Bruce Fields\ rpc_unlink(gss_auth->dentry[1]); 8211da177e4SLinus Torvalds err_put_mech: 8221da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 8231da177e4SLinus Torvalds err_free: 8241da177e4SLinus Torvalds kfree(gss_auth); 8251da177e4SLinus Torvalds out_dec: 8261da177e4SLinus Torvalds module_put(THIS_MODULE); 8276a19275aSJ. Bruce Fields return ERR_PTR(err); 8281da177e4SLinus Torvalds } 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds static void 8310285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 8320285ed1fSTrond Myklebust { 83334769fc4S\"J. Bruce Fields\ rpc_unlink(gss_auth->dentry[1]); 83434769fc4S\"J. Bruce Fields\ rpc_unlink(gss_auth->dentry[0]); 8350285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 8360285ed1fSTrond Myklebust 8370285ed1fSTrond Myklebust kfree(gss_auth); 8380285ed1fSTrond Myklebust module_put(THIS_MODULE); 8390285ed1fSTrond Myklebust } 8400285ed1fSTrond Myklebust 8410285ed1fSTrond Myklebust static void 8420285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 8430285ed1fSTrond Myklebust { 8440285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 8450285ed1fSTrond Myklebust 8460285ed1fSTrond Myklebust gss_free(gss_auth); 8470285ed1fSTrond Myklebust } 8480285ed1fSTrond Myklebust 8490285ed1fSTrond Myklebust static void 8501da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 8511da177e4SLinus Torvalds { 8521da177e4SLinus Torvalds struct gss_auth *gss_auth; 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 8551da177e4SLinus Torvalds auth, auth->au_flavor); 8561da177e4SLinus Torvalds 8573ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 8583ab9bb72STrond Myklebust 8591da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 8600285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 8611da177e4SLinus Torvalds } 8621da177e4SLinus Torvalds 8630df7fb74STrond Myklebust /* 8640df7fb74STrond Myklebust * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 8650df7fb74STrond Myklebust * to the server with the GSS control procedure field set to 8660df7fb74STrond Myklebust * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 8670df7fb74STrond Myklebust * all RPCSEC_GSS state associated with that context. 8680df7fb74STrond Myklebust */ 8690df7fb74STrond Myklebust static int 8700df7fb74STrond Myklebust gss_destroying_context(struct rpc_cred *cred) 8710df7fb74STrond Myklebust { 8720df7fb74STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 8730df7fb74STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 8740df7fb74STrond Myklebust struct rpc_task *task; 8750df7fb74STrond Myklebust 8760df7fb74STrond Myklebust if (gss_cred->gc_ctx == NULL || 8776dcd3926SJeff Layton test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 8780df7fb74STrond Myklebust return 0; 8790df7fb74STrond Myklebust 8800df7fb74STrond Myklebust gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 8810df7fb74STrond Myklebust cred->cr_ops = &gss_nullops; 8820df7fb74STrond Myklebust 8830df7fb74STrond Myklebust /* Take a reference to ensure the cred will be destroyed either 8840df7fb74STrond Myklebust * by the RPC call or by the put_rpccred() below */ 8850df7fb74STrond Myklebust get_rpccred(cred); 8860df7fb74STrond Myklebust 887080a1f14STrond Myklebust task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 8880df7fb74STrond Myklebust if (!IS_ERR(task)) 8890df7fb74STrond Myklebust rpc_put_task(task); 8900df7fb74STrond Myklebust 8910df7fb74STrond Myklebust put_rpccred(cred); 8920df7fb74STrond Myklebust return 1; 8930df7fb74STrond Myklebust } 8940df7fb74STrond Myklebust 8950df7fb74STrond Myklebust /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 8961da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 8971da177e4SLinus Torvalds * allocated before freeing them. */ 8981da177e4SLinus Torvalds static void 8995d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 9001da177e4SLinus Torvalds { 9015d28dc82STrond Myklebust dprintk("RPC: gss_free_ctx\n"); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 9041da177e4SLinus Torvalds kfree(ctx); 9051da177e4SLinus Torvalds } 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds static void 9085d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 9095d28dc82STrond Myklebust { 9105d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 9115d28dc82STrond Myklebust gss_do_free_ctx(ctx); 9125d28dc82STrond Myklebust } 9135d28dc82STrond Myklebust 9145d28dc82STrond Myklebust static void 9155d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 9165d28dc82STrond Myklebust { 917a4deb81bSTrond Myklebust struct gss_ctx *gc_gss_ctx; 918a4deb81bSTrond Myklebust 919a4deb81bSTrond Myklebust gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); 920a4deb81bSTrond Myklebust rcu_assign_pointer(ctx->gc_gss_ctx, NULL); 9215d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 922a4deb81bSTrond Myklebust if (gc_gss_ctx) 923a4deb81bSTrond Myklebust gss_delete_sec_context(&gc_gss_ctx); 9245d28dc82STrond Myklebust } 9255d28dc82STrond Myklebust 9265d28dc82STrond Myklebust static void 92731be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 9281da177e4SLinus Torvalds { 92931be5bf1STrond Myklebust dprintk("RPC: gss_free_cred %p\n", gss_cred); 93031be5bf1STrond Myklebust kfree(gss_cred); 93131be5bf1STrond Myklebust } 9321da177e4SLinus Torvalds 93331be5bf1STrond Myklebust static void 93431be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 93531be5bf1STrond Myklebust { 93631be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 93731be5bf1STrond Myklebust gss_free_cred(gss_cred); 93831be5bf1STrond Myklebust } 9391da177e4SLinus Torvalds 94031be5bf1STrond Myklebust static void 9416dcd3926SJeff Layton gss_destroy_nullcred(struct rpc_cred *cred) 94231be5bf1STrond Myklebust { 9435d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 9440285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 9455d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 9465d28dc82STrond Myklebust 9475d28dc82STrond Myklebust rcu_assign_pointer(gss_cred->gc_ctx, NULL); 94831be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 9495d28dc82STrond Myklebust if (ctx) 9505d28dc82STrond Myklebust gss_put_ctx(ctx); 9510285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 9521da177e4SLinus Torvalds } 9531da177e4SLinus Torvalds 9546dcd3926SJeff Layton static void 9556dcd3926SJeff Layton gss_destroy_cred(struct rpc_cred *cred) 9566dcd3926SJeff Layton { 9576dcd3926SJeff Layton 9586dcd3926SJeff Layton if (gss_destroying_context(cred)) 9596dcd3926SJeff Layton return; 9606dcd3926SJeff Layton gss_destroy_nullcred(cred); 9616dcd3926SJeff Layton } 9626dcd3926SJeff Layton 9631da177e4SLinus Torvalds /* 9641da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 9651da177e4SLinus Torvalds */ 9661da177e4SLinus Torvalds static struct rpc_cred * 9678a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 9681da177e4SLinus Torvalds { 9698a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 9701da177e4SLinus Torvalds } 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds static struct rpc_cred * 9738a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 9741da177e4SLinus Torvalds { 9751da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 9761da177e4SLinus Torvalds struct gss_cred *cred = NULL; 9771da177e4SLinus Torvalds int err = -ENOMEM; 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 9801da177e4SLinus Torvalds acred->uid, auth->au_flavor); 9811da177e4SLinus Torvalds 9820f38b873STrond Myklebust if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 9831da177e4SLinus Torvalds goto out_err; 9841da177e4SLinus Torvalds 9855fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 9861da177e4SLinus Torvalds /* 9871da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 9881da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 9891da177e4SLinus Torvalds */ 990fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 9911da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 9927c67db3aSTrond Myklebust cred->gc_machine_cred = acred->machine_cred; 9930285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 9941da177e4SLinus Torvalds return &cred->gc_base; 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds out_err: 9971da177e4SLinus Torvalds dprintk("RPC: gss_create_cred failed with error %d\n", err); 9981da177e4SLinus Torvalds return ERR_PTR(err); 9991da177e4SLinus Torvalds } 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds static int 1002fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 1003fba3bad4STrond Myklebust { 1004fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 1005fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 1006fba3bad4STrond Myklebust int err; 1007fba3bad4STrond Myklebust 1008fba3bad4STrond Myklebust do { 1009fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 1010fba3bad4STrond Myklebust } while (err == -EAGAIN); 1011fba3bad4STrond Myklebust return err; 1012fba3bad4STrond Myklebust } 1013fba3bad4STrond Myklebust 1014fba3bad4STrond Myklebust static int 10158a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 10161da177e4SLinus Torvalds { 10171da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 10181da177e4SLinus Torvalds 1019cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 10208a317760STrond Myklebust goto out; 10211da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 1022cd019f75STrond Myklebust if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 1023cd019f75STrond Myklebust return 0; 1024cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 10251da177e4SLinus Torvalds return 0; 10268a317760STrond Myklebust out: 10277c67db3aSTrond Myklebust if (acred->machine_cred != gss_cred->gc_machine_cred) 10287c67db3aSTrond Myklebust return 0; 10291da177e4SLinus Torvalds return (rc->cr_uid == acred->uid); 10301da177e4SLinus Torvalds } 10311da177e4SLinus Torvalds 10321da177e4SLinus Torvalds /* 10331da177e4SLinus Torvalds * Marshal credentials. 10341da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 10351da177e4SLinus Torvalds */ 1036d8ed029dSAlexey Dobriyan static __be32 * 1037d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 10381da177e4SLinus Torvalds { 10391da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 10401da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 10411da177e4SLinus Torvalds gc_base); 10421da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1043d8ed029dSAlexey Dobriyan __be32 *cred_len; 10441da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 10451da177e4SLinus Torvalds u32 maj_stat = 0; 10461da177e4SLinus Torvalds struct xdr_netobj mic; 10471da177e4SLinus Torvalds struct kvec iov; 10481da177e4SLinus Torvalds struct xdr_buf verf_buf; 10491da177e4SLinus Torvalds 10508885cb36SChuck Lever dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 10531da177e4SLinus Torvalds cred_len = p++; 10541da177e4SLinus Torvalds 10551da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 10561da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 10571da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 10601da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 10611da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 10621da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 10631da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 10641da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 10671da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 1068808012fbSChuck Lever iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 1069808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 10701da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 10711da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds /* set verifier flavor*/ 10741da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 107700fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 10781da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 1079fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 10801da177e4SLinus Torvalds } else if (maj_stat != 0) { 10811da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 10821da177e4SLinus Torvalds goto out_put_ctx; 10831da177e4SLinus Torvalds } 10841da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 10851da177e4SLinus Torvalds gss_put_ctx(ctx); 10861da177e4SLinus Torvalds return p; 10871da177e4SLinus Torvalds out_put_ctx: 10881da177e4SLinus Torvalds gss_put_ctx(ctx); 10891da177e4SLinus Torvalds return NULL; 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds 1092cd019f75STrond Myklebust static int gss_renew_cred(struct rpc_task *task) 1093cd019f75STrond Myklebust { 1094cd019f75STrond Myklebust struct rpc_cred *oldcred = task->tk_msg.rpc_cred; 1095cd019f75STrond Myklebust struct gss_cred *gss_cred = container_of(oldcred, 1096cd019f75STrond Myklebust struct gss_cred, 1097cd019f75STrond Myklebust gc_base); 1098cd019f75STrond Myklebust struct rpc_auth *auth = oldcred->cr_auth; 1099cd019f75STrond Myklebust struct auth_cred acred = { 1100cd019f75STrond Myklebust .uid = oldcred->cr_uid, 1101cd019f75STrond Myklebust .machine_cred = gss_cred->gc_machine_cred, 1102cd019f75STrond Myklebust }; 1103cd019f75STrond Myklebust struct rpc_cred *new; 1104cd019f75STrond Myklebust 1105cd019f75STrond Myklebust new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 1106cd019f75STrond Myklebust if (IS_ERR(new)) 1107cd019f75STrond Myklebust return PTR_ERR(new); 1108cd019f75STrond Myklebust task->tk_msg.rpc_cred = new; 1109cd019f75STrond Myklebust put_rpccred(oldcred); 1110cd019f75STrond Myklebust return 0; 1111cd019f75STrond Myklebust } 1112cd019f75STrond Myklebust 11131da177e4SLinus Torvalds /* 11141da177e4SLinus Torvalds * Refresh credentials. XXX - finish 11151da177e4SLinus Torvalds */ 11161da177e4SLinus Torvalds static int 11171da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 11181da177e4SLinus Torvalds { 1119cd019f75STrond Myklebust struct rpc_cred *cred = task->tk_msg.rpc_cred; 1120cd019f75STrond Myklebust int ret = 0; 11211da177e4SLinus Torvalds 1122cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 1123cd019f75STrond Myklebust !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 1124cd019f75STrond Myklebust ret = gss_renew_cred(task); 1125cd019f75STrond Myklebust if (ret < 0) 1126cd019f75STrond Myklebust goto out; 1127cd019f75STrond Myklebust cred = task->tk_msg.rpc_cred; 1128cd019f75STrond Myklebust } 1129cd019f75STrond Myklebust 1130cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 1131cd019f75STrond Myklebust ret = gss_refresh_upcall(task); 1132cd019f75STrond Myklebust out: 1133cd019f75STrond Myklebust return ret; 11341da177e4SLinus Torvalds } 11351da177e4SLinus Torvalds 11360df7fb74STrond Myklebust /* Dummy refresh routine: used only when destroying the context */ 11370df7fb74STrond Myklebust static int 11380df7fb74STrond Myklebust gss_refresh_null(struct rpc_task *task) 11390df7fb74STrond Myklebust { 11400df7fb74STrond Myklebust return -EACCES; 11410df7fb74STrond Myklebust } 11420df7fb74STrond Myklebust 1143d8ed029dSAlexey Dobriyan static __be32 * 1144d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 11451da177e4SLinus Torvalds { 11461da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 11471da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1148d8ed029dSAlexey Dobriyan __be32 seq; 11491da177e4SLinus Torvalds struct kvec iov; 11501da177e4SLinus Torvalds struct xdr_buf verf_buf; 11511da177e4SLinus Torvalds struct xdr_netobj mic; 11521da177e4SLinus Torvalds u32 flav,len; 11531da177e4SLinus Torvalds u32 maj_stat; 11541da177e4SLinus Torvalds 11558885cb36SChuck Lever dprintk("RPC: %5u gss_validate\n", task->tk_pid); 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds flav = ntohl(*p++); 11581da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 11591da177e4SLinus Torvalds goto out_bad; 11601da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 11611da177e4SLinus Torvalds goto out_bad; 11621da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 11631da177e4SLinus Torvalds iov.iov_base = &seq; 11641da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 11651da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 11661da177e4SLinus Torvalds mic.data = (u8 *)p; 11671da177e4SLinus Torvalds mic.len = len; 11681da177e4SLinus Torvalds 116900fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 11701da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1171fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11720df7fb74STrond Myklebust if (maj_stat) { 11730df7fb74STrond Myklebust dprintk("RPC: %5u gss_validate: gss_verify_mic returned " 11740df7fb74STrond Myklebust "error 0x%08x\n", task->tk_pid, maj_stat); 11751da177e4SLinus Torvalds goto out_bad; 11760df7fb74STrond Myklebust } 117724b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 117824b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 11791be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 11801da177e4SLinus Torvalds gss_put_ctx(ctx); 11818885cb36SChuck Lever dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 11821da177e4SLinus Torvalds task->tk_pid); 11831da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 11841da177e4SLinus Torvalds out_bad: 11851da177e4SLinus Torvalds gss_put_ctx(ctx); 11868885cb36SChuck Lever dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 11871da177e4SLinus Torvalds return NULL; 11881da177e4SLinus Torvalds } 11891da177e4SLinus Torvalds 11901da177e4SLinus Torvalds static inline int 11911da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1192d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 11931da177e4SLinus Torvalds { 11941da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 11951da177e4SLinus Torvalds struct xdr_buf integ_buf; 1196d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 11971da177e4SLinus Torvalds struct xdr_netobj mic; 1198d8ed029dSAlexey Dobriyan u32 offset; 1199d8ed029dSAlexey Dobriyan __be32 *q; 12001da177e4SLinus Torvalds struct kvec *iov; 12011da177e4SLinus Torvalds u32 maj_stat = 0; 12021da177e4SLinus Torvalds int status = -EIO; 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds integ_len = p++; 12051da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 12061da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 12071da177e4SLinus Torvalds 120888a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 12091da177e4SLinus Torvalds if (status) 12101da177e4SLinus Torvalds return status; 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 12131da177e4SLinus Torvalds offset, snd_buf->len - offset)) 12141da177e4SLinus Torvalds return status; 12151da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 12181da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 12191da177e4SLinus Torvalds iov = snd_buf->tail; 12201da177e4SLinus Torvalds else 12211da177e4SLinus Torvalds iov = snd_buf->head; 12221da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 12231da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 12241da177e4SLinus Torvalds 122500fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 12261da177e4SLinus Torvalds status = -EIO; /* XXX? */ 12271da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1228fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 12291da177e4SLinus Torvalds else if (maj_stat) 12301da177e4SLinus Torvalds return status; 12311da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 12341da177e4SLinus Torvalds iov->iov_len += offset; 12351da177e4SLinus Torvalds snd_buf->len += offset; 12361da177e4SLinus Torvalds return 0; 12371da177e4SLinus Torvalds } 12381da177e4SLinus Torvalds 12392d2da60cSJ. Bruce Fields static void 12402d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 12412d2da60cSJ. Bruce Fields { 12422d2da60cSJ. Bruce Fields int i; 12432d2da60cSJ. Bruce Fields 12442d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 12452d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 12462d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 12472d2da60cSJ. Bruce Fields } 12482d2da60cSJ. Bruce Fields 12492d2da60cSJ. Bruce Fields static int 12502d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 12512d2da60cSJ. Bruce Fields { 12522d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 12532d2da60cSJ. Bruce Fields int first, last, i; 12542d2da60cSJ. Bruce Fields 12552d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 12562d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 12572d2da60cSJ. Bruce Fields return 0; 12582d2da60cSJ. Bruce Fields } 12592d2da60cSJ. Bruce Fields 12602d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 12612d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 12622d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 12632d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 12642d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 12652d2da60cSJ. Bruce Fields GFP_NOFS); 12662d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 12672d2da60cSJ. Bruce Fields goto out; 12682d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 12692d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 12702d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 12712d2da60cSJ. Bruce Fields goto out_free; 12722d2da60cSJ. Bruce Fields } 12732d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 12742d2da60cSJ. Bruce Fields return 0; 12752d2da60cSJ. Bruce Fields out_free: 12762d2da60cSJ. Bruce Fields for (i--; i >= 0; i--) { 12772d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 12782d2da60cSJ. Bruce Fields } 12792d2da60cSJ. Bruce Fields out: 12802d2da60cSJ. Bruce Fields return -EAGAIN; 12812d2da60cSJ. Bruce Fields } 12822d2da60cSJ. Bruce Fields 12832d2da60cSJ. Bruce Fields static inline int 12842d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1285d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 12862d2da60cSJ. Bruce Fields { 12872d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 12882d2da60cSJ. Bruce Fields u32 offset; 12892d2da60cSJ. Bruce Fields u32 maj_stat; 12902d2da60cSJ. Bruce Fields int status; 1291d8ed029dSAlexey Dobriyan __be32 *opaque_len; 12922d2da60cSJ. Bruce Fields struct page **inpages; 12932d2da60cSJ. Bruce Fields int first; 12942d2da60cSJ. Bruce Fields int pad; 12952d2da60cSJ. Bruce Fields struct kvec *iov; 12962d2da60cSJ. Bruce Fields char *tmp; 12972d2da60cSJ. Bruce Fields 12982d2da60cSJ. Bruce Fields opaque_len = p++; 12992d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 13002d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 13012d2da60cSJ. Bruce Fields 130288a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 13032d2da60cSJ. Bruce Fields if (status) 13042d2da60cSJ. Bruce Fields return status; 13052d2da60cSJ. Bruce Fields 13062d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 13072d2da60cSJ. Bruce Fields if (status) 13082d2da60cSJ. Bruce Fields return status; 13092d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 13102d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 13112d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 13122d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 13132d2da60cSJ. Bruce Fields /* Give the tail its own page, in case we need extra space in the 13142d2da60cSJ. Bruce Fields * head when wrapping: */ 13152d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 13162d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 13172d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 13182d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 13192d2da60cSJ. Bruce Fields } 132000fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 13212d2da60cSJ. Bruce Fields /* RPC_SLACK_SPACE should prevent this ever happening: */ 13222d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 13232d2da60cSJ. Bruce Fields status = -EIO; 13242d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 13252d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 13262d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1327fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 13282d2da60cSJ. Bruce Fields else if (maj_stat) 13292d2da60cSJ. Bruce Fields return status; 13302d2da60cSJ. Bruce Fields 13312d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 13322d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 13332d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 13342d2da60cSJ. Bruce Fields iov = snd_buf->tail; 13352d2da60cSJ. Bruce Fields else 13362d2da60cSJ. Bruce Fields iov = snd_buf->head; 13372d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 13382d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 13392d2da60cSJ. Bruce Fields memset(p, 0, pad); 13402d2da60cSJ. Bruce Fields iov->iov_len += pad; 13412d2da60cSJ. Bruce Fields snd_buf->len += pad; 13422d2da60cSJ. Bruce Fields 13432d2da60cSJ. Bruce Fields return 0; 13442d2da60cSJ. Bruce Fields } 13452d2da60cSJ. Bruce Fields 13461da177e4SLinus Torvalds static int 13471da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 1348d8ed029dSAlexey Dobriyan kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 13491da177e4SLinus Torvalds { 13501da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 13511da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 13521da177e4SLinus Torvalds gc_base); 13531da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 13541da177e4SLinus Torvalds int status = -EIO; 13551da177e4SLinus Torvalds 13568885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 13571da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 13581da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 13591da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 13601da177e4SLinus Torvalds */ 136188a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 13621da177e4SLinus Torvalds goto out; 13631da177e4SLinus Torvalds } 13641da177e4SLinus Torvalds switch (gss_cred->gc_service) { 13651da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 136688a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 13671da177e4SLinus Torvalds break; 13681da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 13691da177e4SLinus Torvalds status = gss_wrap_req_integ(cred, ctx, encode, 13701da177e4SLinus Torvalds rqstp, p, obj); 13711da177e4SLinus Torvalds break; 13721da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 13732d2da60cSJ. Bruce Fields status = gss_wrap_req_priv(cred, ctx, encode, 13742d2da60cSJ. Bruce Fields rqstp, p, obj); 13751da177e4SLinus Torvalds break; 13761da177e4SLinus Torvalds } 13771da177e4SLinus Torvalds out: 13781da177e4SLinus Torvalds gss_put_ctx(ctx); 13798885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 13801da177e4SLinus Torvalds return status; 13811da177e4SLinus Torvalds } 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds static inline int 13841da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1385d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 13861da177e4SLinus Torvalds { 13871da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 13881da177e4SLinus Torvalds struct xdr_buf integ_buf; 13891da177e4SLinus Torvalds struct xdr_netobj mic; 13901da177e4SLinus Torvalds u32 data_offset, mic_offset; 13911da177e4SLinus Torvalds u32 integ_len; 13921da177e4SLinus Torvalds u32 maj_stat; 13931da177e4SLinus Torvalds int status = -EIO; 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 13961da177e4SLinus Torvalds if (integ_len & 3) 13971da177e4SLinus Torvalds return status; 13981da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 13991da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 14001da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 14011da177e4SLinus Torvalds return status; 14021da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 14031da177e4SLinus Torvalds return status; 14041da177e4SLinus Torvalds 14051da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 14061da177e4SLinus Torvalds mic_offset - data_offset)) 14071da177e4SLinus Torvalds return status; 14081da177e4SLinus Torvalds 14091da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 14101da177e4SLinus Torvalds return status; 14111da177e4SLinus Torvalds 141200fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 14131da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1414fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 14151da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 14161da177e4SLinus Torvalds return status; 14171da177e4SLinus Torvalds return 0; 14181da177e4SLinus Torvalds } 14191da177e4SLinus Torvalds 14202d2da60cSJ. Bruce Fields static inline int 14212d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1422d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 14232d2da60cSJ. Bruce Fields { 14242d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 14252d2da60cSJ. Bruce Fields u32 offset; 14262d2da60cSJ. Bruce Fields u32 opaque_len; 14272d2da60cSJ. Bruce Fields u32 maj_stat; 14282d2da60cSJ. Bruce Fields int status = -EIO; 14292d2da60cSJ. Bruce Fields 14302d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 14312d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 14322d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 14332d2da60cSJ. Bruce Fields return status; 14342d2da60cSJ. Bruce Fields /* remove padding: */ 14352d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 14362d2da60cSJ. Bruce Fields 143700fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 14382d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1439fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 14402d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 14412d2da60cSJ. Bruce Fields return status; 14422d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 14432d2da60cSJ. Bruce Fields return status; 14442d2da60cSJ. Bruce Fields 14452d2da60cSJ. Bruce Fields return 0; 14462d2da60cSJ. Bruce Fields } 14472d2da60cSJ. Bruce Fields 14482d2da60cSJ. Bruce Fields 14491da177e4SLinus Torvalds static int 14501da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1451d8ed029dSAlexey Dobriyan kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 14521da177e4SLinus Torvalds { 14531da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 14541da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 14551da177e4SLinus Torvalds gc_base); 14561da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1457d8ed029dSAlexey Dobriyan __be32 *savedp = p; 14582d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 14592d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 14601da177e4SLinus Torvalds int status = -EIO; 14611da177e4SLinus Torvalds 14621da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 14631da177e4SLinus Torvalds goto out_decode; 14641da177e4SLinus Torvalds switch (gss_cred->gc_service) { 14651da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 14661da177e4SLinus Torvalds break; 14671da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 14681da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 14691da177e4SLinus Torvalds if (status) 14701da177e4SLinus Torvalds goto out; 14711da177e4SLinus Torvalds break; 14721da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 14732d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 14742d2da60cSJ. Bruce Fields if (status) 14752d2da60cSJ. Bruce Fields goto out; 14761da177e4SLinus Torvalds break; 14771da177e4SLinus Torvalds } 147824b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 14791be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 14802d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 14811da177e4SLinus Torvalds out_decode: 148288a9fe8cSTrond Myklebust status = decode(rqstp, p, obj); 14831da177e4SLinus Torvalds out: 14841da177e4SLinus Torvalds gss_put_ctx(ctx); 14858885cb36SChuck Lever dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 14861da177e4SLinus Torvalds status); 14871da177e4SLinus Torvalds return status; 14881da177e4SLinus Torvalds } 14891da177e4SLinus Torvalds 1490f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 14911da177e4SLinus Torvalds .owner = THIS_MODULE, 14921da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 14931da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 14941da177e4SLinus Torvalds .create = gss_create, 14951da177e4SLinus Torvalds .destroy = gss_destroy, 14961da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 14971da177e4SLinus Torvalds .crcreate = gss_create_cred 14981da177e4SLinus Torvalds }; 14991da177e4SLinus Torvalds 1500f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 15011da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 15021da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1503fba3bad4STrond Myklebust .cr_init = gss_cred_init, 15045c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 15051da177e4SLinus Torvalds .crmatch = gss_match, 15061da177e4SLinus Torvalds .crmarshal = gss_marshal, 15071da177e4SLinus Torvalds .crrefresh = gss_refresh, 15081da177e4SLinus Torvalds .crvalidate = gss_validate, 15091da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 15101da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 15111da177e4SLinus Torvalds }; 15121da177e4SLinus Torvalds 15130df7fb74STrond Myklebust static const struct rpc_credops gss_nullops = { 15140df7fb74STrond Myklebust .cr_name = "AUTH_GSS", 15156dcd3926SJeff Layton .crdestroy = gss_destroy_nullcred, 15165c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 15170df7fb74STrond Myklebust .crmatch = gss_match, 15180df7fb74STrond Myklebust .crmarshal = gss_marshal, 15190df7fb74STrond Myklebust .crrefresh = gss_refresh_null, 15200df7fb74STrond Myklebust .crvalidate = gss_validate, 15210df7fb74STrond Myklebust .crwrap_req = gss_wrap_req, 15220df7fb74STrond Myklebust .crunwrap_resp = gss_unwrap_resp, 15230df7fb74STrond Myklebust }; 15240df7fb74STrond Myklebust 1525b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0 = { 15261da177e4SLinus Torvalds .upcall = gss_pipe_upcall, 15271da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 15281da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 152934769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v0, 153034769fc4S\"J. Bruce Fields\ .release_pipe = gss_pipe_release, 153134769fc4S\"J. Bruce Fields\ }; 153234769fc4S\"J. Bruce Fields\ 1533b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1 = { 153434769fc4S\"J. Bruce Fields\ .upcall = gss_pipe_upcall, 153534769fc4S\"J. Bruce Fields\ .downcall = gss_pipe_downcall, 153634769fc4S\"J. Bruce Fields\ .destroy_msg = gss_pipe_destroy_msg, 153734769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v1, 15381da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 15391da177e4SLinus Torvalds }; 15401da177e4SLinus Torvalds 15411da177e4SLinus Torvalds /* 15421da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 15431da177e4SLinus Torvalds */ 15441da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 15451da177e4SLinus Torvalds { 15461da177e4SLinus Torvalds int err = 0; 15471da177e4SLinus Torvalds 15481da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 15491da177e4SLinus Torvalds if (err) 15501da177e4SLinus Torvalds goto out; 15511da177e4SLinus Torvalds err = gss_svc_init(); 15521da177e4SLinus Torvalds if (err) 15531da177e4SLinus Torvalds goto out_unregister; 155479a3f20bS\"J. Bruce Fields\ rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); 15551da177e4SLinus Torvalds return 0; 15561da177e4SLinus Torvalds out_unregister: 15571da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 15581da177e4SLinus Torvalds out: 15591da177e4SLinus Torvalds return err; 15601da177e4SLinus Torvalds } 15611da177e4SLinus Torvalds 15621da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 15631da177e4SLinus Torvalds { 15641da177e4SLinus Torvalds gss_svc_shutdown(); 15651da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 1566bf12691dSJesper Dangaard Brouer rcu_barrier(); /* Wait for completion of call_rcu()'s */ 15671da177e4SLinus Torvalds } 15681da177e4SLinus Torvalds 15691da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 15701da177e4SLinus Torvalds module_init(init_rpcsec_gss) 15711da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1572