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 64725f2865SKevin Coffman #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) 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) { 209dc5ddce9SJeff Layton /* 210dc5ddce9SJeff Layton * in which case, p points to an error code. Anything other 211dc5ddce9SJeff Layton * than -EKEYEXPIRED gets converted to -EACCES. 212dc5ddce9SJeff Layton */ 213dc5ddce9SJeff Layton p = simple_get_bytes(p, end, &ret, sizeof(ret)); 214dc5ddce9SJeff Layton if (!IS_ERR(p)) 215dc5ddce9SJeff Layton p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : 216dc5ddce9SJeff Layton ERR_PTR(-EACCES); 2171da177e4SLinus Torvalds goto err; 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds /* copy the opaque wire context */ 2201da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2211da177e4SLinus Torvalds if (IS_ERR(p)) 2221da177e4SLinus Torvalds goto err; 2231da177e4SLinus Torvalds /* import the opaque security context */ 2241da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2251da177e4SLinus Torvalds if (IS_ERR(p)) 2261da177e4SLinus Torvalds goto err; 2271da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2281da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2291da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2301da177e4SLinus Torvalds goto err; 2311da177e4SLinus Torvalds } 2321da177e4SLinus Torvalds ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 2331da177e4SLinus Torvalds if (ret < 0) { 2341da177e4SLinus Torvalds p = ERR_PTR(ret); 2351da177e4SLinus Torvalds goto err; 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds return q; 2381da177e4SLinus Torvalds err: 2391da177e4SLinus Torvalds dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 2401da177e4SLinus Torvalds return p; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 24334769fc4S\"J. Bruce Fields\ #define UPCALL_BUF_LEN 128 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds struct gss_upcall_msg { 2461da177e4SLinus Torvalds atomic_t count; 2471da177e4SLinus Torvalds uid_t uid; 2481da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2491da177e4SLinus Torvalds struct list_head list; 2501da177e4SLinus Torvalds struct gss_auth *auth; 2515b7ddd4aS\"J. Bruce Fields\ struct rpc_inode *inode; 2521da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2531da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2541da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 25534769fc4S\"J. Bruce Fields\ char databuf[UPCALL_BUF_LEN]; 2561da177e4SLinus Torvalds }; 2571da177e4SLinus Torvalds 25879a3f20bS\"J. Bruce Fields\ static int get_pipe_version(void) 25979a3f20bS\"J. Bruce Fields\ { 26079a3f20bS\"J. Bruce Fields\ int ret; 26179a3f20bS\"J. Bruce Fields\ 26279a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 26379a3f20bS\"J. Bruce Fields\ if (pipe_version >= 0) { 26479a3f20bS\"J. Bruce Fields\ atomic_inc(&pipe_users); 26534769fc4S\"J. Bruce Fields\ ret = pipe_version; 26679a3f20bS\"J. Bruce Fields\ } else 26779a3f20bS\"J. Bruce Fields\ ret = -EAGAIN; 26879a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 26979a3f20bS\"J. Bruce Fields\ return ret; 27079a3f20bS\"J. Bruce Fields\ } 27179a3f20bS\"J. Bruce Fields\ 27279a3f20bS\"J. Bruce Fields\ static void put_pipe_version(void) 27379a3f20bS\"J. Bruce Fields\ { 27479a3f20bS\"J. Bruce Fields\ if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) { 27579a3f20bS\"J. Bruce Fields\ pipe_version = -1; 27679a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 27779a3f20bS\"J. Bruce Fields\ } 27879a3f20bS\"J. Bruce Fields\ } 27979a3f20bS\"J. Bruce Fields\ 2801da177e4SLinus Torvalds static void 2811da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 2821da177e4SLinus Torvalds { 2831da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 2841da177e4SLinus Torvalds return; 28579a3f20bS\"J. Bruce Fields\ put_pipe_version(); 2861da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 2871da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 2881da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 289f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 2901da177e4SLinus Torvalds kfree(gss_msg); 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds static struct gss_upcall_msg * 2946e84c7b6STrond Myklebust __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds struct gss_upcall_msg *pos; 2976e84c7b6STrond Myklebust list_for_each_entry(pos, &rpci->in_downcall, list) { 2981da177e4SLinus Torvalds if (pos->uid != uid) 2991da177e4SLinus Torvalds continue; 3001da177e4SLinus Torvalds atomic_inc(&pos->count); 3011da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found msg %p\n", pos); 3021da177e4SLinus Torvalds return pos; 3031da177e4SLinus Torvalds } 3041da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found nothing\n"); 3051da177e4SLinus Torvalds return NULL; 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds 308720b8f2dS\\\"J. Bruce Fields\\\ /* Try to add an upcall to the pipefs queue. 3091da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 3101da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 3111da177e4SLinus Torvalds */ 3121da177e4SLinus Torvalds static inline struct gss_upcall_msg * 313053e324fSSuresh Jayaraman gss_add_msg(struct gss_upcall_msg *gss_msg) 3141da177e4SLinus Torvalds { 3155b7ddd4aS\"J. Bruce Fields\ struct rpc_inode *rpci = gss_msg->inode; 3165b7ddd4aS\"J. Bruce Fields\ struct inode *inode = &rpci->vfs_inode; 3171da177e4SLinus Torvalds struct gss_upcall_msg *old; 3181da177e4SLinus Torvalds 319b185f835STrond Myklebust spin_lock(&inode->i_lock); 3206e84c7b6STrond Myklebust old = __gss_find_upcall(rpci, gss_msg->uid); 3211da177e4SLinus Torvalds if (old == NULL) { 3221da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3236e84c7b6STrond Myklebust list_add(&gss_msg->list, &rpci->in_downcall); 3241da177e4SLinus Torvalds } else 3251da177e4SLinus Torvalds gss_msg = old; 326b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3271da177e4SLinus Torvalds return gss_msg; 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds static void 3311da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3321da177e4SLinus Torvalds { 3331da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3341da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3351da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3361da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds static void 3401da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3411da177e4SLinus Torvalds { 3425b7ddd4aS\"J. Bruce Fields\ struct inode *inode = &gss_msg->inode->vfs_inode; 3431da177e4SLinus Torvalds 3443b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3453b68aaeaSTrond Myklebust return; 346b185f835STrond Myklebust spin_lock(&inode->i_lock); 3473b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3481da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 349b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds static void 3531da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 3541da177e4SLinus Torvalds { 3551da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 3561da177e4SLinus Torvalds struct gss_cred, gc_base); 3571da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 3585b7ddd4aS\"J. Bruce Fields\ struct inode *inode = &gss_msg->inode->vfs_inode; 3591da177e4SLinus Torvalds 3605d28dc82STrond Myklebust spin_lock(&inode->i_lock); 3611da177e4SLinus Torvalds if (gss_msg->ctx) 3627b6962b0STrond Myklebust gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 3631da177e4SLinus Torvalds else 3641da177e4SLinus Torvalds task->tk_status = gss_msg->msg.errno; 3651da177e4SLinus Torvalds gss_cred->gc_upcall = NULL; 3661da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 367b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3681da177e4SLinus Torvalds gss_release_msg(gss_msg); 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 37134769fc4S\"J. Bruce Fields\ static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) 37234769fc4S\"J. Bruce Fields\ { 37334769fc4S\"J. Bruce Fields\ gss_msg->msg.data = &gss_msg->uid; 37434769fc4S\"J. Bruce Fields\ gss_msg->msg.len = sizeof(gss_msg->uid); 37534769fc4S\"J. Bruce Fields\ } 37634769fc4S\"J. Bruce Fields\ 3778b1c7bf5SOlga Kornievskaia static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, 3782efef708SOlga Kornievskaia struct rpc_clnt *clnt, int machine_cred) 37934769fc4S\"J. Bruce Fields\ { 3808b1c7bf5SOlga Kornievskaia char *p = gss_msg->databuf; 3818b1c7bf5SOlga Kornievskaia int len = 0; 3828b1c7bf5SOlga Kornievskaia 3838b1c7bf5SOlga Kornievskaia gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", 38434769fc4S\"J. Bruce Fields\ gss_msg->auth->mech->gm_name, 38534769fc4S\"J. Bruce Fields\ gss_msg->uid); 3868b1c7bf5SOlga Kornievskaia p += gss_msg->msg.len; 3878b1c7bf5SOlga Kornievskaia if (clnt->cl_principal) { 3888b1c7bf5SOlga Kornievskaia len = sprintf(p, "target=%s ", clnt->cl_principal); 3898b1c7bf5SOlga Kornievskaia p += len; 3908b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 3918b1c7bf5SOlga Kornievskaia } 3922efef708SOlga Kornievskaia if (machine_cred) { 3932efef708SOlga Kornievskaia len = sprintf(p, "service=* "); 3942efef708SOlga Kornievskaia p += len; 3952efef708SOlga Kornievskaia gss_msg->msg.len += len; 3962efef708SOlga Kornievskaia } else if (!strcmp(clnt->cl_program->name, "nfs4_cb")) { 3972efef708SOlga Kornievskaia len = sprintf(p, "service=nfs "); 3982efef708SOlga Kornievskaia p += len; 3992efef708SOlga Kornievskaia gss_msg->msg.len += len; 4002efef708SOlga Kornievskaia } 4018b1c7bf5SOlga Kornievskaia len = sprintf(p, "\n"); 4028b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4038b1c7bf5SOlga Kornievskaia 40434769fc4S\"J. Bruce Fields\ gss_msg->msg.data = gss_msg->databuf; 40534769fc4S\"J. Bruce Fields\ BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); 40634769fc4S\"J. Bruce Fields\ } 40734769fc4S\"J. Bruce Fields\ 4088b1c7bf5SOlga Kornievskaia static void gss_encode_msg(struct gss_upcall_msg *gss_msg, 4092efef708SOlga Kornievskaia struct rpc_clnt *clnt, int machine_cred) 41034769fc4S\"J. Bruce Fields\ { 41134769fc4S\"J. Bruce Fields\ if (pipe_version == 0) 41234769fc4S\"J. Bruce Fields\ gss_encode_v0_msg(gss_msg); 41334769fc4S\"J. Bruce Fields\ else /* pipe_version == 1 */ 4142efef708SOlga Kornievskaia gss_encode_v1_msg(gss_msg, clnt, machine_cred); 41534769fc4S\"J. Bruce Fields\ } 41634769fc4S\"J. Bruce Fields\ 4171da177e4SLinus Torvalds static inline struct gss_upcall_msg * 4182efef708SOlga Kornievskaia gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt, 4192efef708SOlga Kornievskaia int machine_cred) 4201da177e4SLinus Torvalds { 4211da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 42279a3f20bS\"J. Bruce Fields\ int vers; 4231da177e4SLinus Torvalds 4240f38b873STrond Myklebust gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 425db75b3d6S\"J. Bruce Fields\ if (gss_msg == NULL) 426db75b3d6S\"J. Bruce Fields\ return ERR_PTR(-ENOMEM); 42779a3f20bS\"J. Bruce Fields\ vers = get_pipe_version(); 42879a3f20bS\"J. Bruce Fields\ if (vers < 0) { 42979a3f20bS\"J. Bruce Fields\ kfree(gss_msg); 43079a3f20bS\"J. Bruce Fields\ return ERR_PTR(vers); 43179a3f20bS\"J. Bruce Fields\ } 43234769fc4S\"J. Bruce Fields\ gss_msg->inode = RPC_I(gss_auth->dentry[vers]->d_inode); 4331da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 4341da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 4351da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 4361da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 4371da177e4SLinus Torvalds gss_msg->uid = uid; 4381da177e4SLinus Torvalds gss_msg->auth = gss_auth; 4392efef708SOlga Kornievskaia gss_encode_msg(gss_msg, clnt, machine_cred); 4401da177e4SLinus Torvalds return gss_msg; 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds static struct gss_upcall_msg * 4441da177e4SLinus Torvalds gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 4451da177e4SLinus Torvalds { 4467c67db3aSTrond Myklebust struct gss_cred *gss_cred = container_of(cred, 4477c67db3aSTrond Myklebust struct gss_cred, gc_base); 4481da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 4497c67db3aSTrond Myklebust uid_t uid = cred->cr_uid; 4501da177e4SLinus Torvalds 4512efef708SOlga Kornievskaia gss_new = gss_alloc_msg(gss_auth, uid, clnt, gss_cred->gc_machine_cred); 452db75b3d6S\"J. Bruce Fields\ if (IS_ERR(gss_new)) 453db75b3d6S\"J. Bruce Fields\ return gss_new; 454053e324fSSuresh Jayaraman gss_msg = gss_add_msg(gss_new); 4551da177e4SLinus Torvalds if (gss_msg == gss_new) { 4565b7ddd4aS\"J. Bruce Fields\ struct inode *inode = &gss_new->inode->vfs_inode; 4575b7ddd4aS\"J. Bruce Fields\ int res = rpc_queue_upcall(inode, &gss_new->msg); 4581da177e4SLinus Torvalds if (res) { 4591da177e4SLinus Torvalds gss_unhash_msg(gss_new); 4601da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds } else 4631da177e4SLinus Torvalds gss_release_msg(gss_new); 4641da177e4SLinus Torvalds return gss_msg; 4651da177e4SLinus Torvalds } 4661da177e4SLinus Torvalds 467b03568c3S\"J. Bruce Fields\ static void warn_gssd(void) 468b03568c3S\"J. Bruce Fields\ { 469b03568c3S\"J. Bruce Fields\ static unsigned long ratelimit; 470b03568c3S\"J. Bruce Fields\ unsigned long now = jiffies; 471b03568c3S\"J. Bruce Fields\ 472b03568c3S\"J. Bruce Fields\ if (time_after(now, ratelimit)) { 473b03568c3S\"J. Bruce Fields\ printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 474b03568c3S\"J. Bruce Fields\ "Please check user daemon is running.\n"); 475b03568c3S\"J. Bruce Fields\ ratelimit = now + 15*HZ; 476b03568c3S\"J. Bruce Fields\ } 477b03568c3S\"J. Bruce Fields\ } 478b03568c3S\"J. Bruce Fields\ 4791da177e4SLinus Torvalds static inline int 4801da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 4811da177e4SLinus Torvalds { 4821da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 4834a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 4841da177e4SLinus Torvalds struct gss_auth, rpc_auth); 4851da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 4861da177e4SLinus Torvalds struct gss_cred, gc_base); 4871da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 4885b7ddd4aS\"J. Bruce Fields\ struct inode *inode; 4891da177e4SLinus Torvalds int err = 0; 4901da177e4SLinus Torvalds 4918885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 4928885cb36SChuck Lever cred->cr_uid); 4931da177e4SLinus Torvalds gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 494480e3243SRoel Kluin if (PTR_ERR(gss_msg) == -EAGAIN) { 49579a3f20bS\"J. Bruce Fields\ /* XXX: warning on the first, under the assumption we 49679a3f20bS\"J. Bruce Fields\ * shouldn't normally hit this case on a refresh. */ 49779a3f20bS\"J. Bruce Fields\ warn_gssd(); 49879a3f20bS\"J. Bruce Fields\ task->tk_timeout = 15*HZ; 49979a3f20bS\"J. Bruce Fields\ rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); 50079a3f20bS\"J. Bruce Fields\ return 0; 50179a3f20bS\"J. Bruce Fields\ } 5021da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 5031da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 5041da177e4SLinus Torvalds goto out; 5051da177e4SLinus Torvalds } 5065b7ddd4aS\"J. Bruce Fields\ inode = &gss_msg->inode->vfs_inode; 507b185f835STrond Myklebust spin_lock(&inode->i_lock); 5081da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 5095d00837bSTrond Myklebust rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 5107b6962b0STrond Myklebust else if (gss_msg->ctx != NULL) { 5117b6962b0STrond Myklebust gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 5127b6962b0STrond Myklebust gss_cred->gc_upcall = NULL; 5137b6962b0STrond Myklebust rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 5147b6962b0STrond Myklebust } else if (gss_msg->msg.errno >= 0) { 5151da177e4SLinus Torvalds task->tk_timeout = 0; 5161da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 5171da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 5181da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5195d00837bSTrond Myklebust rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 5201da177e4SLinus Torvalds } else 5211da177e4SLinus Torvalds err = gss_msg->msg.errno; 522b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5231da177e4SLinus Torvalds gss_release_msg(gss_msg); 5241da177e4SLinus Torvalds out: 5258885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 5268885cb36SChuck Lever task->tk_pid, cred->cr_uid, err); 5271da177e4SLinus Torvalds return err; 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds static inline int 5311da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 5321da177e4SLinus Torvalds { 5335b7ddd4aS\"J. Bruce Fields\ struct inode *inode; 5341da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 5351da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5361da177e4SLinus Torvalds DEFINE_WAIT(wait); 5371da177e4SLinus Torvalds int err = 0; 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 54079a3f20bS\"J. Bruce Fields\ retry: 5411da177e4SLinus Torvalds gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 54279a3f20bS\"J. Bruce Fields\ if (PTR_ERR(gss_msg) == -EAGAIN) { 54379a3f20bS\"J. Bruce Fields\ err = wait_event_interruptible_timeout(pipe_version_waitqueue, 54479a3f20bS\"J. Bruce Fields\ pipe_version >= 0, 15*HZ); 54579a3f20bS\"J. Bruce Fields\ if (err) 54679a3f20bS\"J. Bruce Fields\ goto out; 54779a3f20bS\"J. Bruce Fields\ if (pipe_version < 0) 54879a3f20bS\"J. Bruce Fields\ warn_gssd(); 54979a3f20bS\"J. Bruce Fields\ goto retry; 55079a3f20bS\"J. Bruce Fields\ } 5511da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 5521da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 5531da177e4SLinus Torvalds goto out; 5541da177e4SLinus Torvalds } 5555b7ddd4aS\"J. Bruce Fields\ inode = &gss_msg->inode->vfs_inode; 5561da177e4SLinus Torvalds for (;;) { 5571da177e4SLinus Torvalds prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 558b185f835STrond Myklebust spin_lock(&inode->i_lock); 5591da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 5601da177e4SLinus Torvalds break; 5611da177e4SLinus Torvalds } 562b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5631da177e4SLinus Torvalds if (signalled()) { 5641da177e4SLinus Torvalds err = -ERESTARTSYS; 5651da177e4SLinus Torvalds goto out_intr; 5661da177e4SLinus Torvalds } 5671da177e4SLinus Torvalds schedule(); 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds if (gss_msg->ctx) 5707b6962b0STrond Myklebust gss_cred_set_ctx(cred, gss_msg->ctx); 5711da177e4SLinus Torvalds else 5721da177e4SLinus Torvalds err = gss_msg->msg.errno; 5735d28dc82STrond Myklebust spin_unlock(&inode->i_lock); 5741da177e4SLinus Torvalds out_intr: 5751da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 5761da177e4SLinus Torvalds gss_release_msg(gss_msg); 5771da177e4SLinus Torvalds out: 5788885cb36SChuck Lever dprintk("RPC: gss_create_upcall for uid %u result %d\n", 5798885cb36SChuck Lever cred->cr_uid, err); 5801da177e4SLinus Torvalds return err; 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds static ssize_t 5841da177e4SLinus Torvalds gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 5851da177e4SLinus Torvalds char __user *dst, size_t buflen) 5861da177e4SLinus Torvalds { 5871da177e4SLinus Torvalds char *data = (char *)msg->data + msg->copied; 5887df08995SChuck Lever size_t mlen = min(msg->len, buflen); 5897df08995SChuck Lever unsigned long left; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds left = copy_to_user(dst, data, mlen); 5927df08995SChuck Lever if (left == mlen) { 5937df08995SChuck Lever msg->errno = -EFAULT; 5947df08995SChuck Lever return -EFAULT; 5951da177e4SLinus Torvalds } 5967df08995SChuck Lever 5971da177e4SLinus Torvalds mlen -= left; 5981da177e4SLinus Torvalds msg->copied += mlen; 5991da177e4SLinus Torvalds msg->errno = 0; 6001da177e4SLinus Torvalds return mlen; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds static ssize_t 6061da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 6071da177e4SLinus Torvalds { 6081da177e4SLinus Torvalds const void *p, *end; 6091da177e4SLinus Torvalds void *buf; 6101da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 611b185f835STrond Myklebust struct inode *inode = filp->f_path.dentry->d_inode; 6121da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 6131da177e4SLinus Torvalds uid_t uid; 6143b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 6171da177e4SLinus Torvalds goto out; 6181da177e4SLinus Torvalds err = -ENOMEM; 6190f38b873STrond Myklebust buf = kmalloc(mlen, GFP_NOFS); 6201da177e4SLinus Torvalds if (!buf) 6211da177e4SLinus Torvalds goto out; 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds err = -EFAULT; 6241da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 6251da177e4SLinus Torvalds goto err; 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 6281da177e4SLinus Torvalds p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 6291da177e4SLinus Torvalds if (IS_ERR(p)) { 6301da177e4SLinus Torvalds err = PTR_ERR(p); 6311da177e4SLinus Torvalds goto err; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds err = -ENOMEM; 6351da177e4SLinus Torvalds ctx = gss_alloc_context(); 6361da177e4SLinus Torvalds if (ctx == NULL) 6371da177e4SLinus Torvalds goto err; 6383b68aaeaSTrond Myklebust 6393b68aaeaSTrond Myklebust err = -ENOENT; 6403b68aaeaSTrond Myklebust /* Find a matching upcall */ 6413b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 6426e84c7b6STrond Myklebust gss_msg = __gss_find_upcall(RPC_I(inode), uid); 6433b68aaeaSTrond Myklebust if (gss_msg == NULL) { 6443b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 6453b68aaeaSTrond Myklebust goto err_put_ctx; 6463b68aaeaSTrond Myklebust } 6473b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 6483b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 6493b68aaeaSTrond Myklebust 6506e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 6511da177e4SLinus Torvalds if (IS_ERR(p)) { 6521da177e4SLinus Torvalds err = PTR_ERR(p); 653486bad2eSJeff Layton switch (err) { 654486bad2eSJeff Layton case -EACCES: 655dc5ddce9SJeff Layton case -EKEYEXPIRED: 656486bad2eSJeff Layton gss_msg->msg.errno = err; 657486bad2eSJeff Layton err = mlen; 658486bad2eSJeff Layton break; 659486bad2eSJeff Layton case -EFAULT: 660486bad2eSJeff Layton case -ENOMEM: 661486bad2eSJeff Layton case -EINVAL: 662486bad2eSJeff Layton case -ENOSYS: 663486bad2eSJeff Layton gss_msg->msg.errno = -EAGAIN; 664486bad2eSJeff Layton break; 665486bad2eSJeff Layton default: 666486bad2eSJeff Layton printk(KERN_CRIT "%s: bad return from " 6676c853099SRandy Dunlap "gss_fill_context: %zd\n", __func__, err); 668486bad2eSJeff Layton BUG(); 669486bad2eSJeff Layton } 6703b68aaeaSTrond Myklebust goto err_release_msg; 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 6733b68aaeaSTrond Myklebust err = mlen; 6743b68aaeaSTrond Myklebust 6753b68aaeaSTrond Myklebust err_release_msg: 6763b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 6771da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 678b185f835STrond Myklebust spin_unlock(&inode->i_lock); 6791da177e4SLinus Torvalds gss_release_msg(gss_msg); 6801da177e4SLinus Torvalds err_put_ctx: 6811da177e4SLinus Torvalds gss_put_ctx(ctx); 6821da177e4SLinus Torvalds err: 6831da177e4SLinus Torvalds kfree(buf); 6841da177e4SLinus Torvalds out: 6853b68aaeaSTrond Myklebust dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 6861da177e4SLinus Torvalds return err; 6871da177e4SLinus Torvalds } 6881da177e4SLinus Torvalds 68934769fc4S\"J. Bruce Fields\ static int gss_pipe_open(struct inode *inode, int new_version) 690cf81939dS\"J. Bruce Fields\ { 69134769fc4S\"J. Bruce Fields\ int ret = 0; 69234769fc4S\"J. Bruce Fields\ 69379a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 69479a3f20bS\"J. Bruce Fields\ if (pipe_version < 0) { 69534769fc4S\"J. Bruce Fields\ /* First open of any gss pipe determines the version: */ 69634769fc4S\"J. Bruce Fields\ pipe_version = new_version; 69779a3f20bS\"J. Bruce Fields\ rpc_wake_up(&pipe_version_rpc_waitqueue); 69879a3f20bS\"J. Bruce Fields\ wake_up(&pipe_version_waitqueue); 69934769fc4S\"J. Bruce Fields\ } else if (pipe_version != new_version) { 70034769fc4S\"J. Bruce Fields\ /* Trying to open a pipe of a different version */ 70134769fc4S\"J. Bruce Fields\ ret = -EBUSY; 70234769fc4S\"J. Bruce Fields\ goto out; 70379a3f20bS\"J. Bruce Fields\ } 704cf81939dS\"J. Bruce Fields\ atomic_inc(&pipe_users); 70534769fc4S\"J. Bruce Fields\ out: 70679a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 70734769fc4S\"J. Bruce Fields\ return ret; 70834769fc4S\"J. Bruce Fields\ 70934769fc4S\"J. Bruce Fields\ } 71034769fc4S\"J. Bruce Fields\ 71134769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v0(struct inode *inode) 71234769fc4S\"J. Bruce Fields\ { 71334769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 0); 71434769fc4S\"J. Bruce Fields\ } 71534769fc4S\"J. Bruce Fields\ 71634769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v1(struct inode *inode) 71734769fc4S\"J. Bruce Fields\ { 71834769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 1); 719cf81939dS\"J. Bruce Fields\ } 720cf81939dS\"J. Bruce Fields\ 7211da177e4SLinus Torvalds static void 7221da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 7231da177e4SLinus Torvalds { 7241da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 7251da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 7261da177e4SLinus Torvalds 7276e84c7b6STrond Myklebust spin_lock(&inode->i_lock); 7286e84c7b6STrond Myklebust while (!list_empty(&rpci->in_downcall)) { 7296e84c7b6STrond Myklebust 7306e84c7b6STrond Myklebust gss_msg = list_entry(rpci->in_downcall.next, 7311da177e4SLinus Torvalds struct gss_upcall_msg, list); 7321da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 7331da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 7341da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 735b185f835STrond Myklebust spin_unlock(&inode->i_lock); 7361da177e4SLinus Torvalds gss_release_msg(gss_msg); 737b185f835STrond Myklebust spin_lock(&inode->i_lock); 7381da177e4SLinus Torvalds } 739b185f835STrond Myklebust spin_unlock(&inode->i_lock); 740cf81939dS\"J. Bruce Fields\ 74179a3f20bS\"J. Bruce Fields\ put_pipe_version(); 7421da177e4SLinus Torvalds } 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds static void 7451da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 7461da177e4SLinus Torvalds { 7471da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds if (msg->errno < 0) { 7501da177e4SLinus Torvalds dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 7511da177e4SLinus Torvalds gss_msg); 7521da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 7531da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 754b03568c3S\"J. Bruce Fields\ if (msg->errno == -ETIMEDOUT) 755b03568c3S\"J. Bruce Fields\ warn_gssd(); 7561da177e4SLinus Torvalds gss_release_msg(gss_msg); 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds /* 7611da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 7621da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 7631da177e4SLinus Torvalds */ 7641da177e4SLinus Torvalds static struct rpc_auth * 7651da177e4SLinus Torvalds gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 7661da177e4SLinus Torvalds { 7671da177e4SLinus Torvalds struct gss_auth *gss_auth; 7681da177e4SLinus Torvalds struct rpc_auth * auth; 7696a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 7746a19275aSJ. Bruce Fields return ERR_PTR(err); 7751da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 7761da177e4SLinus Torvalds goto out_dec; 7771da177e4SLinus Torvalds gss_auth->client = clnt; 7786a19275aSJ. Bruce Fields err = -EINVAL; 7791da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 7801da177e4SLinus Torvalds if (!gss_auth->mech) { 7813392c349SJames Morris printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", 7820dc47877SHarvey Harrison __func__, flavor); 7831da177e4SLinus Torvalds goto err_free; 7841da177e4SLinus Torvalds } 7851da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 786438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 787438b6fdeSJ. Bruce Fields goto err_put_mech; 7881da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 7891da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 7901da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 7911da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 7921da177e4SLinus Torvalds auth->au_flavor = flavor; 7931da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 7940285ed1fSTrond Myklebust kref_init(&gss_auth->kref); 7951da177e4SLinus Torvalds 79634769fc4S\"J. Bruce Fields\ /* 79734769fc4S\"J. Bruce Fields\ * Note: if we created the old pipe first, then someone who 79834769fc4S\"J. Bruce Fields\ * examined the directory at the right moment might conclude 79934769fc4S\"J. Bruce Fields\ * that we supported only the old pipe. So we instead create 80034769fc4S\"J. Bruce Fields\ * the new pipe first. 80134769fc4S\"J. Bruce Fields\ */ 8027d217cacSTrond Myklebust gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry, 80334769fc4S\"J. Bruce Fields\ "gssd", 80434769fc4S\"J. Bruce Fields\ clnt, &gss_upcall_ops_v1, 80534769fc4S\"J. Bruce Fields\ RPC_PIPE_WAIT_FOR_OPEN); 80634769fc4S\"J. Bruce Fields\ if (IS_ERR(gss_auth->dentry[1])) { 80734769fc4S\"J. Bruce Fields\ err = PTR_ERR(gss_auth->dentry[1]); 8081da177e4SLinus Torvalds goto err_put_mech; 8096a19275aSJ. Bruce Fields } 8101da177e4SLinus Torvalds 8117d217cacSTrond Myklebust gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry, 81234769fc4S\"J. Bruce Fields\ gss_auth->mech->gm_name, 81334769fc4S\"J. Bruce Fields\ clnt, &gss_upcall_ops_v0, 81434769fc4S\"J. Bruce Fields\ RPC_PIPE_WAIT_FOR_OPEN); 81534769fc4S\"J. Bruce Fields\ if (IS_ERR(gss_auth->dentry[0])) { 81634769fc4S\"J. Bruce Fields\ err = PTR_ERR(gss_auth->dentry[0]); 81734769fc4S\"J. Bruce Fields\ goto err_unlink_pipe_1; 81834769fc4S\"J. Bruce Fields\ } 819f5c2187cSTrond Myklebust err = rpcauth_init_credcache(auth); 82007a2bf1dSTrond Myklebust if (err) 82134769fc4S\"J. Bruce Fields\ goto err_unlink_pipe_0; 82207a2bf1dSTrond Myklebust 8231da177e4SLinus Torvalds return auth; 82434769fc4S\"J. Bruce Fields\ err_unlink_pipe_0: 82534769fc4S\"J. Bruce Fields\ rpc_unlink(gss_auth->dentry[0]); 82634769fc4S\"J. Bruce Fields\ err_unlink_pipe_1: 82734769fc4S\"J. Bruce Fields\ rpc_unlink(gss_auth->dentry[1]); 8281da177e4SLinus Torvalds err_put_mech: 8291da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 8301da177e4SLinus Torvalds err_free: 8311da177e4SLinus Torvalds kfree(gss_auth); 8321da177e4SLinus Torvalds out_dec: 8331da177e4SLinus Torvalds module_put(THIS_MODULE); 8346a19275aSJ. Bruce Fields return ERR_PTR(err); 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds static void 8380285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 8390285ed1fSTrond Myklebust { 84034769fc4S\"J. Bruce Fields\ rpc_unlink(gss_auth->dentry[1]); 84134769fc4S\"J. Bruce Fields\ rpc_unlink(gss_auth->dentry[0]); 8420285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 8430285ed1fSTrond Myklebust 8440285ed1fSTrond Myklebust kfree(gss_auth); 8450285ed1fSTrond Myklebust module_put(THIS_MODULE); 8460285ed1fSTrond Myklebust } 8470285ed1fSTrond Myklebust 8480285ed1fSTrond Myklebust static void 8490285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 8500285ed1fSTrond Myklebust { 8510285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 8520285ed1fSTrond Myklebust 8530285ed1fSTrond Myklebust gss_free(gss_auth); 8540285ed1fSTrond Myklebust } 8550285ed1fSTrond Myklebust 8560285ed1fSTrond Myklebust static void 8571da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 8581da177e4SLinus Torvalds { 8591da177e4SLinus Torvalds struct gss_auth *gss_auth; 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 8621da177e4SLinus Torvalds auth, auth->au_flavor); 8631da177e4SLinus Torvalds 8643ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 8653ab9bb72STrond Myklebust 8661da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 8670285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 8681da177e4SLinus Torvalds } 8691da177e4SLinus Torvalds 8700df7fb74STrond Myklebust /* 8710df7fb74STrond Myklebust * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 8720df7fb74STrond Myklebust * to the server with the GSS control procedure field set to 8730df7fb74STrond Myklebust * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 8740df7fb74STrond Myklebust * all RPCSEC_GSS state associated with that context. 8750df7fb74STrond Myklebust */ 8760df7fb74STrond Myklebust static int 8770df7fb74STrond Myklebust gss_destroying_context(struct rpc_cred *cred) 8780df7fb74STrond Myklebust { 8790df7fb74STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 8800df7fb74STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 8810df7fb74STrond Myklebust struct rpc_task *task; 8820df7fb74STrond Myklebust 8830df7fb74STrond Myklebust if (gss_cred->gc_ctx == NULL || 8846dcd3926SJeff Layton test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 8850df7fb74STrond Myklebust return 0; 8860df7fb74STrond Myklebust 8870df7fb74STrond Myklebust gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 8880df7fb74STrond Myklebust cred->cr_ops = &gss_nullops; 8890df7fb74STrond Myklebust 8900df7fb74STrond Myklebust /* Take a reference to ensure the cred will be destroyed either 8910df7fb74STrond Myklebust * by the RPC call or by the put_rpccred() below */ 8920df7fb74STrond Myklebust get_rpccred(cred); 8930df7fb74STrond Myklebust 894080a1f14STrond Myklebust task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 8950df7fb74STrond Myklebust if (!IS_ERR(task)) 8960df7fb74STrond Myklebust rpc_put_task(task); 8970df7fb74STrond Myklebust 8980df7fb74STrond Myklebust put_rpccred(cred); 8990df7fb74STrond Myklebust return 1; 9000df7fb74STrond Myklebust } 9010df7fb74STrond Myklebust 9020df7fb74STrond Myklebust /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 9031da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 9041da177e4SLinus Torvalds * allocated before freeing them. */ 9051da177e4SLinus Torvalds static void 9065d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 9071da177e4SLinus Torvalds { 9085d28dc82STrond Myklebust dprintk("RPC: gss_free_ctx\n"); 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 9111da177e4SLinus Torvalds kfree(ctx); 9121da177e4SLinus Torvalds } 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds static void 9155d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 9165d28dc82STrond Myklebust { 9175d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 9185d28dc82STrond Myklebust gss_do_free_ctx(ctx); 9195d28dc82STrond Myklebust } 9205d28dc82STrond Myklebust 9215d28dc82STrond Myklebust static void 9225d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 9235d28dc82STrond Myklebust { 924a4deb81bSTrond Myklebust struct gss_ctx *gc_gss_ctx; 925a4deb81bSTrond Myklebust 926a4deb81bSTrond Myklebust gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); 927a4deb81bSTrond Myklebust rcu_assign_pointer(ctx->gc_gss_ctx, NULL); 9285d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 929a4deb81bSTrond Myklebust if (gc_gss_ctx) 930a4deb81bSTrond Myklebust gss_delete_sec_context(&gc_gss_ctx); 9315d28dc82STrond Myklebust } 9325d28dc82STrond Myklebust 9335d28dc82STrond Myklebust static void 93431be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 9351da177e4SLinus Torvalds { 93631be5bf1STrond Myklebust dprintk("RPC: gss_free_cred %p\n", gss_cred); 93731be5bf1STrond Myklebust kfree(gss_cred); 93831be5bf1STrond Myklebust } 9391da177e4SLinus Torvalds 94031be5bf1STrond Myklebust static void 94131be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 94231be5bf1STrond Myklebust { 94331be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 94431be5bf1STrond Myklebust gss_free_cred(gss_cred); 94531be5bf1STrond Myklebust } 9461da177e4SLinus Torvalds 94731be5bf1STrond Myklebust static void 9486dcd3926SJeff Layton gss_destroy_nullcred(struct rpc_cred *cred) 94931be5bf1STrond Myklebust { 9505d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 9510285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 9525d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 9535d28dc82STrond Myklebust 9545d28dc82STrond Myklebust rcu_assign_pointer(gss_cred->gc_ctx, NULL); 95531be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 9565d28dc82STrond Myklebust if (ctx) 9575d28dc82STrond Myklebust gss_put_ctx(ctx); 9580285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 9591da177e4SLinus Torvalds } 9601da177e4SLinus Torvalds 9616dcd3926SJeff Layton static void 9626dcd3926SJeff Layton gss_destroy_cred(struct rpc_cred *cred) 9636dcd3926SJeff Layton { 9646dcd3926SJeff Layton 9656dcd3926SJeff Layton if (gss_destroying_context(cred)) 9666dcd3926SJeff Layton return; 9676dcd3926SJeff Layton gss_destroy_nullcred(cred); 9686dcd3926SJeff Layton } 9696dcd3926SJeff Layton 9701da177e4SLinus Torvalds /* 9711da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 9721da177e4SLinus Torvalds */ 9731da177e4SLinus Torvalds static struct rpc_cred * 9748a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 9751da177e4SLinus Torvalds { 9768a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 9771da177e4SLinus Torvalds } 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds static struct rpc_cred * 9808a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 9811da177e4SLinus Torvalds { 9821da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 9831da177e4SLinus Torvalds struct gss_cred *cred = NULL; 9841da177e4SLinus Torvalds int err = -ENOMEM; 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 9871da177e4SLinus Torvalds acred->uid, auth->au_flavor); 9881da177e4SLinus Torvalds 9890f38b873STrond Myklebust if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 9901da177e4SLinus Torvalds goto out_err; 9911da177e4SLinus Torvalds 9925fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 9931da177e4SLinus Torvalds /* 9941da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 9951da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 9961da177e4SLinus Torvalds */ 997fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 9981da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 9997c67db3aSTrond Myklebust cred->gc_machine_cred = acred->machine_cred; 10000285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 10011da177e4SLinus Torvalds return &cred->gc_base; 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds out_err: 10041da177e4SLinus Torvalds dprintk("RPC: gss_create_cred failed with error %d\n", err); 10051da177e4SLinus Torvalds return ERR_PTR(err); 10061da177e4SLinus Torvalds } 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds static int 1009fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 1010fba3bad4STrond Myklebust { 1011fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 1012fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 1013fba3bad4STrond Myklebust int err; 1014fba3bad4STrond Myklebust 1015fba3bad4STrond Myklebust do { 1016fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 1017fba3bad4STrond Myklebust } while (err == -EAGAIN); 1018fba3bad4STrond Myklebust return err; 1019fba3bad4STrond Myklebust } 1020fba3bad4STrond Myklebust 1021fba3bad4STrond Myklebust static int 10228a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 10231da177e4SLinus Torvalds { 10241da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 10251da177e4SLinus Torvalds 1026cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 10278a317760STrond Myklebust goto out; 10281da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 1029cd019f75STrond Myklebust if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 1030cd019f75STrond Myklebust return 0; 1031cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 10321da177e4SLinus Torvalds return 0; 10338a317760STrond Myklebust out: 10347c67db3aSTrond Myklebust if (acred->machine_cred != gss_cred->gc_machine_cred) 10357c67db3aSTrond Myklebust return 0; 10361da177e4SLinus Torvalds return (rc->cr_uid == acred->uid); 10371da177e4SLinus Torvalds } 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds /* 10401da177e4SLinus Torvalds * Marshal credentials. 10411da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 10421da177e4SLinus Torvalds */ 1043d8ed029dSAlexey Dobriyan static __be32 * 1044d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 10451da177e4SLinus Torvalds { 10461da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 10471da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 10481da177e4SLinus Torvalds gc_base); 10491da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1050d8ed029dSAlexey Dobriyan __be32 *cred_len; 10511da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 10521da177e4SLinus Torvalds u32 maj_stat = 0; 10531da177e4SLinus Torvalds struct xdr_netobj mic; 10541da177e4SLinus Torvalds struct kvec iov; 10551da177e4SLinus Torvalds struct xdr_buf verf_buf; 10561da177e4SLinus Torvalds 10578885cb36SChuck Lever dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 10601da177e4SLinus Torvalds cred_len = p++; 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 10631da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 10641da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 10671da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 10681da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 10691da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 10701da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 10711da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 10741da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 1075808012fbSChuck Lever iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 1076808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 10771da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 10781da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds /* set verifier flavor*/ 10811da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 108400fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 10851da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 1086fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 10871da177e4SLinus Torvalds } else if (maj_stat != 0) { 10881da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 10891da177e4SLinus Torvalds goto out_put_ctx; 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 10921da177e4SLinus Torvalds gss_put_ctx(ctx); 10931da177e4SLinus Torvalds return p; 10941da177e4SLinus Torvalds out_put_ctx: 10951da177e4SLinus Torvalds gss_put_ctx(ctx); 10961da177e4SLinus Torvalds return NULL; 10971da177e4SLinus Torvalds } 10981da177e4SLinus Torvalds 1099cd019f75STrond Myklebust static int gss_renew_cred(struct rpc_task *task) 1100cd019f75STrond Myklebust { 1101cd019f75STrond Myklebust struct rpc_cred *oldcred = task->tk_msg.rpc_cred; 1102cd019f75STrond Myklebust struct gss_cred *gss_cred = container_of(oldcred, 1103cd019f75STrond Myklebust struct gss_cred, 1104cd019f75STrond Myklebust gc_base); 1105cd019f75STrond Myklebust struct rpc_auth *auth = oldcred->cr_auth; 1106cd019f75STrond Myklebust struct auth_cred acred = { 1107cd019f75STrond Myklebust .uid = oldcred->cr_uid, 1108cd019f75STrond Myklebust .machine_cred = gss_cred->gc_machine_cred, 1109cd019f75STrond Myklebust }; 1110cd019f75STrond Myklebust struct rpc_cred *new; 1111cd019f75STrond Myklebust 1112cd019f75STrond Myklebust new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 1113cd019f75STrond Myklebust if (IS_ERR(new)) 1114cd019f75STrond Myklebust return PTR_ERR(new); 1115cd019f75STrond Myklebust task->tk_msg.rpc_cred = new; 1116cd019f75STrond Myklebust put_rpccred(oldcred); 1117cd019f75STrond Myklebust return 0; 1118cd019f75STrond Myklebust } 1119cd019f75STrond Myklebust 11201da177e4SLinus Torvalds /* 11211da177e4SLinus Torvalds * Refresh credentials. XXX - finish 11221da177e4SLinus Torvalds */ 11231da177e4SLinus Torvalds static int 11241da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 11251da177e4SLinus Torvalds { 1126cd019f75STrond Myklebust struct rpc_cred *cred = task->tk_msg.rpc_cred; 1127cd019f75STrond Myklebust int ret = 0; 11281da177e4SLinus Torvalds 1129cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 1130cd019f75STrond Myklebust !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 1131cd019f75STrond Myklebust ret = gss_renew_cred(task); 1132cd019f75STrond Myklebust if (ret < 0) 1133cd019f75STrond Myklebust goto out; 1134cd019f75STrond Myklebust cred = task->tk_msg.rpc_cred; 1135cd019f75STrond Myklebust } 1136cd019f75STrond Myklebust 1137cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 1138cd019f75STrond Myklebust ret = gss_refresh_upcall(task); 1139cd019f75STrond Myklebust out: 1140cd019f75STrond Myklebust return ret; 11411da177e4SLinus Torvalds } 11421da177e4SLinus Torvalds 11430df7fb74STrond Myklebust /* Dummy refresh routine: used only when destroying the context */ 11440df7fb74STrond Myklebust static int 11450df7fb74STrond Myklebust gss_refresh_null(struct rpc_task *task) 11460df7fb74STrond Myklebust { 11470df7fb74STrond Myklebust return -EACCES; 11480df7fb74STrond Myklebust } 11490df7fb74STrond Myklebust 1150d8ed029dSAlexey Dobriyan static __be32 * 1151d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 11521da177e4SLinus Torvalds { 11531da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 11541da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1155d8ed029dSAlexey Dobriyan __be32 seq; 11561da177e4SLinus Torvalds struct kvec iov; 11571da177e4SLinus Torvalds struct xdr_buf verf_buf; 11581da177e4SLinus Torvalds struct xdr_netobj mic; 11591da177e4SLinus Torvalds u32 flav,len; 11601da177e4SLinus Torvalds u32 maj_stat; 11611da177e4SLinus Torvalds 11628885cb36SChuck Lever dprintk("RPC: %5u gss_validate\n", task->tk_pid); 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds flav = ntohl(*p++); 11651da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 11661da177e4SLinus Torvalds goto out_bad; 11671da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 11681da177e4SLinus Torvalds goto out_bad; 11691da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 11701da177e4SLinus Torvalds iov.iov_base = &seq; 11711da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 11721da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 11731da177e4SLinus Torvalds mic.data = (u8 *)p; 11741da177e4SLinus Torvalds mic.len = len; 11751da177e4SLinus Torvalds 117600fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 11771da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1178fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11790df7fb74STrond Myklebust if (maj_stat) { 11800df7fb74STrond Myklebust dprintk("RPC: %5u gss_validate: gss_verify_mic returned " 11810df7fb74STrond Myklebust "error 0x%08x\n", task->tk_pid, maj_stat); 11821da177e4SLinus Torvalds goto out_bad; 11830df7fb74STrond Myklebust } 118424b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 118524b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 11861be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 11871da177e4SLinus Torvalds gss_put_ctx(ctx); 11888885cb36SChuck Lever dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 11891da177e4SLinus Torvalds task->tk_pid); 11901da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 11911da177e4SLinus Torvalds out_bad: 11921da177e4SLinus Torvalds gss_put_ctx(ctx); 11938885cb36SChuck Lever dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 11941da177e4SLinus Torvalds return NULL; 11951da177e4SLinus Torvalds } 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds static inline int 11981da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1199d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 12001da177e4SLinus Torvalds { 12011da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 12021da177e4SLinus Torvalds struct xdr_buf integ_buf; 1203d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 12041da177e4SLinus Torvalds struct xdr_netobj mic; 1205d8ed029dSAlexey Dobriyan u32 offset; 1206d8ed029dSAlexey Dobriyan __be32 *q; 12071da177e4SLinus Torvalds struct kvec *iov; 12081da177e4SLinus Torvalds u32 maj_stat = 0; 12091da177e4SLinus Torvalds int status = -EIO; 12101da177e4SLinus Torvalds 12111da177e4SLinus Torvalds integ_len = p++; 12121da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 12131da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 12141da177e4SLinus Torvalds 121588a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 12161da177e4SLinus Torvalds if (status) 12171da177e4SLinus Torvalds return status; 12181da177e4SLinus Torvalds 12191da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 12201da177e4SLinus Torvalds offset, snd_buf->len - offset)) 12211da177e4SLinus Torvalds return status; 12221da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 12231da177e4SLinus Torvalds 12241da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 12251da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 12261da177e4SLinus Torvalds iov = snd_buf->tail; 12271da177e4SLinus Torvalds else 12281da177e4SLinus Torvalds iov = snd_buf->head; 12291da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 12301da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 12311da177e4SLinus Torvalds 123200fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 12331da177e4SLinus Torvalds status = -EIO; /* XXX? */ 12341da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1235fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 12361da177e4SLinus Torvalds else if (maj_stat) 12371da177e4SLinus Torvalds return status; 12381da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 12391da177e4SLinus Torvalds 12401da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 12411da177e4SLinus Torvalds iov->iov_len += offset; 12421da177e4SLinus Torvalds snd_buf->len += offset; 12431da177e4SLinus Torvalds return 0; 12441da177e4SLinus Torvalds } 12451da177e4SLinus Torvalds 12462d2da60cSJ. Bruce Fields static void 12472d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 12482d2da60cSJ. Bruce Fields { 12492d2da60cSJ. Bruce Fields int i; 12502d2da60cSJ. Bruce Fields 12512d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 12522d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 12532d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 12542d2da60cSJ. Bruce Fields } 12552d2da60cSJ. Bruce Fields 12562d2da60cSJ. Bruce Fields static int 12572d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 12582d2da60cSJ. Bruce Fields { 12592d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 12602d2da60cSJ. Bruce Fields int first, last, i; 12612d2da60cSJ. Bruce Fields 12622d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 12632d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 12642d2da60cSJ. Bruce Fields return 0; 12652d2da60cSJ. Bruce Fields } 12662d2da60cSJ. Bruce Fields 12672d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 12682d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 12692d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 12702d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 12712d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 12722d2da60cSJ. Bruce Fields GFP_NOFS); 12732d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 12742d2da60cSJ. Bruce Fields goto out; 12752d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 12762d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 12772d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 12782d2da60cSJ. Bruce Fields goto out_free; 12792d2da60cSJ. Bruce Fields } 12802d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 12812d2da60cSJ. Bruce Fields return 0; 12822d2da60cSJ. Bruce Fields out_free: 1283cdead7cfSTrond Myklebust rqstp->rq_enc_pages_num = i; 1284cdead7cfSTrond Myklebust priv_release_snd_buf(rqstp); 12852d2da60cSJ. Bruce Fields out: 12862d2da60cSJ. Bruce Fields return -EAGAIN; 12872d2da60cSJ. Bruce Fields } 12882d2da60cSJ. Bruce Fields 12892d2da60cSJ. Bruce Fields static inline int 12902d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1291d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 12922d2da60cSJ. Bruce Fields { 12932d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 12942d2da60cSJ. Bruce Fields u32 offset; 12952d2da60cSJ. Bruce Fields u32 maj_stat; 12962d2da60cSJ. Bruce Fields int status; 1297d8ed029dSAlexey Dobriyan __be32 *opaque_len; 12982d2da60cSJ. Bruce Fields struct page **inpages; 12992d2da60cSJ. Bruce Fields int first; 13002d2da60cSJ. Bruce Fields int pad; 13012d2da60cSJ. Bruce Fields struct kvec *iov; 13022d2da60cSJ. Bruce Fields char *tmp; 13032d2da60cSJ. Bruce Fields 13042d2da60cSJ. Bruce Fields opaque_len = p++; 13052d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 13062d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 13072d2da60cSJ. Bruce Fields 130888a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 13092d2da60cSJ. Bruce Fields if (status) 13102d2da60cSJ. Bruce Fields return status; 13112d2da60cSJ. Bruce Fields 13122d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 13132d2da60cSJ. Bruce Fields if (status) 13142d2da60cSJ. Bruce Fields return status; 13152d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 13162d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 13172d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 13182d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 13197561042fSKevin Coffman /* 13207561042fSKevin Coffman * Give the tail its own page, in case we need extra space in the 13217561042fSKevin Coffman * head when wrapping: 13227561042fSKevin Coffman * 13237561042fSKevin Coffman * call_allocate() allocates twice the slack space required 13247561042fSKevin Coffman * by the authentication flavor to rq_callsize. 13257561042fSKevin Coffman * For GSS, slack is GSS_CRED_SLACK. 13267561042fSKevin Coffman */ 13272d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 13282d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 13292d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 13302d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 13312d2da60cSJ. Bruce Fields } 133200fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 13337561042fSKevin Coffman /* slack space should prevent this ever happening: */ 13342d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 13352d2da60cSJ. Bruce Fields status = -EIO; 13362d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 13372d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 13382d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1339fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 13402d2da60cSJ. Bruce Fields else if (maj_stat) 13412d2da60cSJ. Bruce Fields return status; 13422d2da60cSJ. Bruce Fields 13432d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 13442d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 13452d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 13462d2da60cSJ. Bruce Fields iov = snd_buf->tail; 13472d2da60cSJ. Bruce Fields else 13482d2da60cSJ. Bruce Fields iov = snd_buf->head; 13492d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 13502d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 13512d2da60cSJ. Bruce Fields memset(p, 0, pad); 13522d2da60cSJ. Bruce Fields iov->iov_len += pad; 13532d2da60cSJ. Bruce Fields snd_buf->len += pad; 13542d2da60cSJ. Bruce Fields 13552d2da60cSJ. Bruce Fields return 0; 13562d2da60cSJ. Bruce Fields } 13572d2da60cSJ. Bruce Fields 13581da177e4SLinus Torvalds static int 13591da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 1360d8ed029dSAlexey Dobriyan kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 13611da177e4SLinus Torvalds { 13621da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 13631da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 13641da177e4SLinus Torvalds gc_base); 13651da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 13661da177e4SLinus Torvalds int status = -EIO; 13671da177e4SLinus Torvalds 13688885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 13691da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 13701da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 13711da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 13721da177e4SLinus Torvalds */ 137388a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 13741da177e4SLinus Torvalds goto out; 13751da177e4SLinus Torvalds } 13761da177e4SLinus Torvalds switch (gss_cred->gc_service) { 13771da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 137888a9fe8cSTrond Myklebust status = encode(rqstp, p, obj); 13791da177e4SLinus Torvalds break; 13801da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 13811da177e4SLinus Torvalds status = gss_wrap_req_integ(cred, ctx, encode, 13821da177e4SLinus Torvalds rqstp, p, obj); 13831da177e4SLinus Torvalds break; 13841da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 13852d2da60cSJ. Bruce Fields status = gss_wrap_req_priv(cred, ctx, encode, 13862d2da60cSJ. Bruce Fields rqstp, p, obj); 13871da177e4SLinus Torvalds break; 13881da177e4SLinus Torvalds } 13891da177e4SLinus Torvalds out: 13901da177e4SLinus Torvalds gss_put_ctx(ctx); 13918885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 13921da177e4SLinus Torvalds return status; 13931da177e4SLinus Torvalds } 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds static inline int 13961da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1397d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 13981da177e4SLinus Torvalds { 13991da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 14001da177e4SLinus Torvalds struct xdr_buf integ_buf; 14011da177e4SLinus Torvalds struct xdr_netobj mic; 14021da177e4SLinus Torvalds u32 data_offset, mic_offset; 14031da177e4SLinus Torvalds u32 integ_len; 14041da177e4SLinus Torvalds u32 maj_stat; 14051da177e4SLinus Torvalds int status = -EIO; 14061da177e4SLinus Torvalds 14071da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 14081da177e4SLinus Torvalds if (integ_len & 3) 14091da177e4SLinus Torvalds return status; 14101da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 14111da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 14121da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 14131da177e4SLinus Torvalds return status; 14141da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 14151da177e4SLinus Torvalds return status; 14161da177e4SLinus Torvalds 14171da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 14181da177e4SLinus Torvalds mic_offset - data_offset)) 14191da177e4SLinus Torvalds return status; 14201da177e4SLinus Torvalds 14211da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 14221da177e4SLinus Torvalds return status; 14231da177e4SLinus Torvalds 142400fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 14251da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1426fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 14271da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 14281da177e4SLinus Torvalds return status; 14291da177e4SLinus Torvalds return 0; 14301da177e4SLinus Torvalds } 14311da177e4SLinus Torvalds 14322d2da60cSJ. Bruce Fields static inline int 14332d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1434d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 14352d2da60cSJ. Bruce Fields { 14362d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 14372d2da60cSJ. Bruce Fields u32 offset; 14382d2da60cSJ. Bruce Fields u32 opaque_len; 14392d2da60cSJ. Bruce Fields u32 maj_stat; 14402d2da60cSJ. Bruce Fields int status = -EIO; 14412d2da60cSJ. Bruce Fields 14422d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 14432d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 14442d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 14452d2da60cSJ. Bruce Fields return status; 14462d2da60cSJ. Bruce Fields /* remove padding: */ 14472d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 14482d2da60cSJ. Bruce Fields 144900fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 14502d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1451fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 14522d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 14532d2da60cSJ. Bruce Fields return status; 14542d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 14552d2da60cSJ. Bruce Fields return status; 14562d2da60cSJ. Bruce Fields 14572d2da60cSJ. Bruce Fields return 0; 14582d2da60cSJ. Bruce Fields } 14592d2da60cSJ. Bruce Fields 14602d2da60cSJ. Bruce Fields 14611da177e4SLinus Torvalds static int 14621da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1463d8ed029dSAlexey Dobriyan kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 14641da177e4SLinus Torvalds { 14651da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 14661da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 14671da177e4SLinus Torvalds gc_base); 14681da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1469d8ed029dSAlexey Dobriyan __be32 *savedp = p; 14702d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 14712d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 14721da177e4SLinus Torvalds int status = -EIO; 14731da177e4SLinus Torvalds 14741da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 14751da177e4SLinus Torvalds goto out_decode; 14761da177e4SLinus Torvalds switch (gss_cred->gc_service) { 14771da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 14781da177e4SLinus Torvalds break; 14791da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 14801da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 14811da177e4SLinus Torvalds if (status) 14821da177e4SLinus Torvalds goto out; 14831da177e4SLinus Torvalds break; 14841da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 14852d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 14862d2da60cSJ. Bruce Fields if (status) 14872d2da60cSJ. Bruce Fields goto out; 14881da177e4SLinus Torvalds break; 14891da177e4SLinus Torvalds } 149024b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 14911be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 14922d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 14931da177e4SLinus Torvalds out_decode: 149488a9fe8cSTrond Myklebust status = decode(rqstp, p, obj); 14951da177e4SLinus Torvalds out: 14961da177e4SLinus Torvalds gss_put_ctx(ctx); 14978885cb36SChuck Lever dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 14981da177e4SLinus Torvalds status); 14991da177e4SLinus Torvalds return status; 15001da177e4SLinus Torvalds } 15011da177e4SLinus Torvalds 1502f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 15031da177e4SLinus Torvalds .owner = THIS_MODULE, 15041da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 15051da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 15061da177e4SLinus Torvalds .create = gss_create, 15071da177e4SLinus Torvalds .destroy = gss_destroy, 15081da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 15091da177e4SLinus Torvalds .crcreate = gss_create_cred 15101da177e4SLinus Torvalds }; 15111da177e4SLinus Torvalds 1512f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 15131da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 15141da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1515fba3bad4STrond Myklebust .cr_init = gss_cred_init, 15165c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 15171da177e4SLinus Torvalds .crmatch = gss_match, 15181da177e4SLinus Torvalds .crmarshal = gss_marshal, 15191da177e4SLinus Torvalds .crrefresh = gss_refresh, 15201da177e4SLinus Torvalds .crvalidate = gss_validate, 15211da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 15221da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 15231da177e4SLinus Torvalds }; 15241da177e4SLinus Torvalds 15250df7fb74STrond Myklebust static const struct rpc_credops gss_nullops = { 15260df7fb74STrond Myklebust .cr_name = "AUTH_GSS", 15276dcd3926SJeff Layton .crdestroy = gss_destroy_nullcred, 15285c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 15290df7fb74STrond Myklebust .crmatch = gss_match, 15300df7fb74STrond Myklebust .crmarshal = gss_marshal, 15310df7fb74STrond Myklebust .crrefresh = gss_refresh_null, 15320df7fb74STrond Myklebust .crvalidate = gss_validate, 15330df7fb74STrond Myklebust .crwrap_req = gss_wrap_req, 15340df7fb74STrond Myklebust .crunwrap_resp = gss_unwrap_resp, 15350df7fb74STrond Myklebust }; 15360df7fb74STrond Myklebust 1537b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0 = { 15381da177e4SLinus Torvalds .upcall = gss_pipe_upcall, 15391da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 15401da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 154134769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v0, 154234769fc4S\"J. Bruce Fields\ .release_pipe = gss_pipe_release, 154334769fc4S\"J. Bruce Fields\ }; 154434769fc4S\"J. Bruce Fields\ 1545b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1 = { 154634769fc4S\"J. Bruce Fields\ .upcall = gss_pipe_upcall, 154734769fc4S\"J. Bruce Fields\ .downcall = gss_pipe_downcall, 154834769fc4S\"J. Bruce Fields\ .destroy_msg = gss_pipe_destroy_msg, 154934769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v1, 15501da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 15511da177e4SLinus Torvalds }; 15521da177e4SLinus Torvalds 15531da177e4SLinus Torvalds /* 15541da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 15551da177e4SLinus Torvalds */ 15561da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 15571da177e4SLinus Torvalds { 15581da177e4SLinus Torvalds int err = 0; 15591da177e4SLinus Torvalds 15601da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 15611da177e4SLinus Torvalds if (err) 15621da177e4SLinus Torvalds goto out; 15631da177e4SLinus Torvalds err = gss_svc_init(); 15641da177e4SLinus Torvalds if (err) 15651da177e4SLinus Torvalds goto out_unregister; 156679a3f20bS\"J. Bruce Fields\ rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); 15671da177e4SLinus Torvalds return 0; 15681da177e4SLinus Torvalds out_unregister: 15691da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 15701da177e4SLinus Torvalds out: 15711da177e4SLinus Torvalds return err; 15721da177e4SLinus Torvalds } 15731da177e4SLinus Torvalds 15741da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 15751da177e4SLinus Torvalds { 15761da177e4SLinus Torvalds gss_svc_shutdown(); 15771da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 1578bf12691dSJesper Dangaard Brouer rcu_barrier(); /* Wait for completion of call_rcu()'s */ 15791da177e4SLinus Torvalds } 15801da177e4SLinus Torvalds 15811da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 15821da177e4SLinus Torvalds module_init(init_rpcsec_gss) 15831da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1584