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 60126e216aSTrond Myklebust #define GSS_RETRY_EXPIRED 5 61126e216aSTrond Myklebust static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; 62126e216aSTrond Myklebust 631da177e4SLinus Torvalds #ifdef RPC_DEBUG 641da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_AUTH 651da177e4SLinus Torvalds #endif 661da177e4SLinus Torvalds 67725f2865SKevin Coffman #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) 681da177e4SLinus Torvalds /* length of a krb5 verifier (48), plus data added before arguments when 691da177e4SLinus Torvalds * using integrity (two 4-byte integers): */ 70adeb8133SOlga Kornievskaia #define GSS_VERF_SLACK 100 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds struct gss_auth { 730285ed1fSTrond Myklebust struct kref kref; 741da177e4SLinus Torvalds struct rpc_auth rpc_auth; 751da177e4SLinus Torvalds struct gss_api_mech *mech; 761da177e4SLinus Torvalds enum rpc_gss_svc service; 771da177e4SLinus Torvalds struct rpc_clnt *client; 7834769fc4S\"J. Bruce Fields\ /* 7934769fc4S\"J. Bruce Fields\ * There are two upcall pipes; dentry[1], named "gssd", is used 8034769fc4S\"J. Bruce Fields\ * for the new text-based upcall; dentry[0] is named after the 8134769fc4S\"J. Bruce Fields\ * mechanism (for example, "krb5") and exists for 8234769fc4S\"J. Bruce Fields\ * backwards-compatibility with older gssd's. 8334769fc4S\"J. Bruce Fields\ */ 84c239d83bSStanislav Kinsbursky struct rpc_pipe *pipe[2]; 851da177e4SLinus Torvalds }; 861da177e4SLinus Torvalds 8779a3f20bS\"J. Bruce Fields\ /* pipe_version >= 0 if and only if someone has a pipe open. */ 8879a3f20bS\"J. Bruce Fields\ static int pipe_version = -1; 89cf81939dS\"J. Bruce Fields\ static atomic_t pipe_users = ATOMIC_INIT(0); 9079a3f20bS\"J. Bruce Fields\ static DEFINE_SPINLOCK(pipe_version_lock); 9179a3f20bS\"J. Bruce Fields\ static struct rpc_wait_queue pipe_version_rpc_waitqueue; 9279a3f20bS\"J. Bruce Fields\ static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); 93cf81939dS\"J. Bruce Fields\ 945d28dc82STrond Myklebust static void gss_free_ctx(struct gss_cl_ctx *); 95b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0; 96b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1; 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds static inline struct gss_cl_ctx * 991da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 1001da177e4SLinus Torvalds { 1011da177e4SLinus Torvalds atomic_inc(&ctx->count); 1021da177e4SLinus Torvalds return ctx; 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds static inline void 1061da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1095d28dc82STrond Myklebust gss_free_ctx(ctx); 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 1125d28dc82STrond Myklebust /* gss_cred_set_ctx: 1135d28dc82STrond Myklebust * called by gss_upcall_callback and gss_create_upcall in order 1145d28dc82STrond Myklebust * to set the gss context. The actual exchange of an old context 1159beae467SStanislav Kinsbursky * and a new one is protected by the pipe->lock. 1165d28dc82STrond Myklebust */ 1171da177e4SLinus Torvalds static void 1181da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1215d28dc82STrond Myklebust 122cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 123cd019f75STrond Myklebust return; 1247b6962b0STrond Myklebust gss_get_ctx(ctx); 125cf778b00SEric Dumazet rcu_assign_pointer(gss_cred->gc_ctx, ctx); 126fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 127cd019f75STrond Myklebust smp_mb__before_clear_bit(); 128fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds static const void * 1321da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1331da177e4SLinus Torvalds { 1341da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1351da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1361da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1371da177e4SLinus Torvalds memcpy(res, p, len); 1381da177e4SLinus Torvalds return q; 1391da177e4SLinus Torvalds } 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds static inline const void * 1421da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1431da177e4SLinus Torvalds { 1441da177e4SLinus Torvalds const void *q; 1451da177e4SLinus Torvalds unsigned int len; 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1481da177e4SLinus Torvalds if (IS_ERR(p)) 1491da177e4SLinus Torvalds return p; 1501da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1511da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1521da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1530f38b873STrond Myklebust dest->data = kmemdup(p, len, GFP_NOFS); 1541da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1551da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1561da177e4SLinus Torvalds dest->len = len; 1571da177e4SLinus Torvalds return q; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds static struct gss_cl_ctx * 1611da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1621da177e4SLinus Torvalds { 1631da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1641da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1651da177e4SLinus Torvalds 1665d28dc82STrond Myklebust rcu_read_lock(); 1671da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1681da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1695d28dc82STrond Myklebust rcu_read_unlock(); 1701da177e4SLinus Torvalds return ctx; 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds static struct gss_cl_ctx * 1741da177e4SLinus Torvalds gss_alloc_context(void) 1751da177e4SLinus Torvalds { 1761da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1771da177e4SLinus Torvalds 1780f38b873STrond Myklebust ctx = kzalloc(sizeof(*ctx), GFP_NOFS); 1791da177e4SLinus Torvalds if (ctx != NULL) { 1801da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 1811da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 1821da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 1831da177e4SLinus Torvalds atomic_set(&ctx->count,1); 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds return ctx; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 1891da177e4SLinus Torvalds static const void * 1901da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds const void *q; 1931da177e4SLinus Torvalds unsigned int seclen; 1941da177e4SLinus Torvalds unsigned int timeout; 1951da177e4SLinus Torvalds u32 window_size; 1961da177e4SLinus Torvalds int ret; 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds /* First unsigned int gives the lifetime (in seconds) of the cred */ 1991da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2001da177e4SLinus Torvalds if (IS_ERR(p)) 2011da177e4SLinus Torvalds goto err; 2021da177e4SLinus Torvalds if (timeout == 0) 2031da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 2041da177e4SLinus Torvalds ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 2051da177e4SLinus Torvalds /* Sequence number window. Determines the maximum number of simultaneous requests */ 2061da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2071da177e4SLinus Torvalds if (IS_ERR(p)) 2081da177e4SLinus Torvalds goto err; 2091da177e4SLinus Torvalds ctx->gc_win = window_size; 2101da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2111da177e4SLinus Torvalds if (ctx->gc_win == 0) { 212dc5ddce9SJeff Layton /* 213dc5ddce9SJeff Layton * in which case, p points to an error code. Anything other 214dc5ddce9SJeff Layton * than -EKEYEXPIRED gets converted to -EACCES. 215dc5ddce9SJeff Layton */ 216dc5ddce9SJeff Layton p = simple_get_bytes(p, end, &ret, sizeof(ret)); 217dc5ddce9SJeff Layton if (!IS_ERR(p)) 218dc5ddce9SJeff Layton p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : 219dc5ddce9SJeff Layton ERR_PTR(-EACCES); 2201da177e4SLinus Torvalds goto err; 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds /* copy the opaque wire context */ 2231da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2241da177e4SLinus Torvalds if (IS_ERR(p)) 2251da177e4SLinus Torvalds goto err; 2261da177e4SLinus Torvalds /* import the opaque security context */ 2271da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2281da177e4SLinus Torvalds if (IS_ERR(p)) 2291da177e4SLinus Torvalds goto err; 2301da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2311da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2321da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2331da177e4SLinus Torvalds goto err; 2341da177e4SLinus Torvalds } 2351f4c86c0STrond Myklebust ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, GFP_NOFS); 2361da177e4SLinus Torvalds if (ret < 0) { 2371da177e4SLinus Torvalds p = ERR_PTR(ret); 2381da177e4SLinus Torvalds goto err; 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds return q; 2411da177e4SLinus Torvalds err: 2421da177e4SLinus Torvalds dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 2431da177e4SLinus Torvalds return p; 2441da177e4SLinus Torvalds } 2451da177e4SLinus Torvalds 24634769fc4S\"J. Bruce Fields\ #define UPCALL_BUF_LEN 128 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds struct gss_upcall_msg { 2491da177e4SLinus Torvalds atomic_t count; 2501da177e4SLinus Torvalds uid_t uid; 2511da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2521da177e4SLinus Torvalds struct list_head list; 2531da177e4SLinus Torvalds struct gss_auth *auth; 2549beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 2551da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2561da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2571da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 25834769fc4S\"J. Bruce Fields\ char databuf[UPCALL_BUF_LEN]; 2591da177e4SLinus Torvalds }; 2601da177e4SLinus Torvalds 26179a3f20bS\"J. Bruce Fields\ static int get_pipe_version(void) 26279a3f20bS\"J. Bruce Fields\ { 26379a3f20bS\"J. Bruce Fields\ int ret; 26479a3f20bS\"J. Bruce Fields\ 26579a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 26679a3f20bS\"J. Bruce Fields\ if (pipe_version >= 0) { 26779a3f20bS\"J. Bruce Fields\ atomic_inc(&pipe_users); 26834769fc4S\"J. Bruce Fields\ ret = pipe_version; 26979a3f20bS\"J. Bruce Fields\ } else 27079a3f20bS\"J. Bruce Fields\ ret = -EAGAIN; 27179a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 27279a3f20bS\"J. Bruce Fields\ return ret; 27379a3f20bS\"J. Bruce Fields\ } 27479a3f20bS\"J. Bruce Fields\ 27579a3f20bS\"J. Bruce Fields\ static void put_pipe_version(void) 27679a3f20bS\"J. Bruce Fields\ { 27779a3f20bS\"J. Bruce Fields\ if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) { 27879a3f20bS\"J. Bruce Fields\ pipe_version = -1; 27979a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 28079a3f20bS\"J. Bruce Fields\ } 28179a3f20bS\"J. Bruce Fields\ } 28279a3f20bS\"J. Bruce Fields\ 2831da177e4SLinus Torvalds static void 2841da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 2851da177e4SLinus Torvalds { 2861da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 2871da177e4SLinus Torvalds return; 28879a3f20bS\"J. Bruce Fields\ put_pipe_version(); 2891da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 2901da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 2911da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 292f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 2931da177e4SLinus Torvalds kfree(gss_msg); 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds static struct gss_upcall_msg * 2979beae467SStanislav Kinsbursky __gss_find_upcall(struct rpc_pipe *pipe, uid_t uid) 2981da177e4SLinus Torvalds { 2991da177e4SLinus Torvalds struct gss_upcall_msg *pos; 3009beae467SStanislav Kinsbursky list_for_each_entry(pos, &pipe->in_downcall, list) { 3011da177e4SLinus Torvalds if (pos->uid != uid) 3021da177e4SLinus Torvalds continue; 3031da177e4SLinus Torvalds atomic_inc(&pos->count); 3041da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found msg %p\n", pos); 3051da177e4SLinus Torvalds return pos; 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found nothing\n"); 3081da177e4SLinus Torvalds return NULL; 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds 311720b8f2dS\\\"J. Bruce Fields\\\ /* Try to add an upcall to the pipefs queue. 3121da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 3131da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 3141da177e4SLinus Torvalds */ 3151da177e4SLinus Torvalds static inline struct gss_upcall_msg * 316053e324fSSuresh Jayaraman gss_add_msg(struct gss_upcall_msg *gss_msg) 3171da177e4SLinus Torvalds { 3189beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3191da177e4SLinus Torvalds struct gss_upcall_msg *old; 3201da177e4SLinus Torvalds 3219beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3229beae467SStanislav Kinsbursky old = __gss_find_upcall(pipe, gss_msg->uid); 3231da177e4SLinus Torvalds if (old == NULL) { 3241da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3259beae467SStanislav Kinsbursky list_add(&gss_msg->list, &pipe->in_downcall); 3261da177e4SLinus Torvalds } else 3271da177e4SLinus Torvalds gss_msg = old; 3289beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3291da177e4SLinus Torvalds return gss_msg; 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds static void 3331da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3341da177e4SLinus Torvalds { 3351da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3361da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3371da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3381da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds static void 3421da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3431da177e4SLinus Torvalds { 3449beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3451da177e4SLinus Torvalds 3463b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3473b68aaeaSTrond Myklebust return; 3489beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3493b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3501da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 3519beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds static void 355126e216aSTrond Myklebust gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) 356126e216aSTrond Myklebust { 357126e216aSTrond Myklebust switch (gss_msg->msg.errno) { 358126e216aSTrond Myklebust case 0: 359126e216aSTrond Myklebust if (gss_msg->ctx == NULL) 360126e216aSTrond Myklebust break; 361126e216aSTrond Myklebust clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 362126e216aSTrond Myklebust gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); 363126e216aSTrond Myklebust break; 364126e216aSTrond Myklebust case -EKEYEXPIRED: 365126e216aSTrond Myklebust set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 366126e216aSTrond Myklebust } 367126e216aSTrond Myklebust gss_cred->gc_upcall_timestamp = jiffies; 368126e216aSTrond Myklebust gss_cred->gc_upcall = NULL; 369126e216aSTrond Myklebust rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 370126e216aSTrond Myklebust } 371126e216aSTrond Myklebust 372126e216aSTrond Myklebust static void 3731da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 3741da177e4SLinus Torvalds { 375a17c2153STrond Myklebust struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, 3761da177e4SLinus Torvalds struct gss_cred, gc_base); 3771da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 3789beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3791da177e4SLinus Torvalds 3809beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 381126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 3829beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 383126e216aSTrond Myklebust task->tk_status = gss_msg->msg.errno; 3841da177e4SLinus Torvalds gss_release_msg(gss_msg); 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 38734769fc4S\"J. Bruce Fields\ static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) 38834769fc4S\"J. Bruce Fields\ { 38934769fc4S\"J. Bruce Fields\ gss_msg->msg.data = &gss_msg->uid; 39034769fc4S\"J. Bruce Fields\ gss_msg->msg.len = sizeof(gss_msg->uid); 39134769fc4S\"J. Bruce Fields\ } 39234769fc4S\"J. Bruce Fields\ 3938b1c7bf5SOlga Kornievskaia static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, 39468c97153STrond Myklebust struct rpc_clnt *clnt, 39568c97153STrond Myklebust const char *service_name) 39634769fc4S\"J. Bruce Fields\ { 397683ac665STrond Myklebust struct gss_api_mech *mech = gss_msg->auth->mech; 3988b1c7bf5SOlga Kornievskaia char *p = gss_msg->databuf; 3998b1c7bf5SOlga Kornievskaia int len = 0; 4008b1c7bf5SOlga Kornievskaia 4018b1c7bf5SOlga Kornievskaia gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", 402683ac665STrond Myklebust mech->gm_name, 40334769fc4S\"J. Bruce Fields\ gss_msg->uid); 4048b1c7bf5SOlga Kornievskaia p += gss_msg->msg.len; 4058b1c7bf5SOlga Kornievskaia if (clnt->cl_principal) { 4068b1c7bf5SOlga Kornievskaia len = sprintf(p, "target=%s ", clnt->cl_principal); 4078b1c7bf5SOlga Kornievskaia p += len; 4088b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4098b1c7bf5SOlga Kornievskaia } 41068c97153STrond Myklebust if (service_name != NULL) { 41168c97153STrond Myklebust len = sprintf(p, "service=%s ", service_name); 4122efef708SOlga Kornievskaia p += len; 4132efef708SOlga Kornievskaia gss_msg->msg.len += len; 4142efef708SOlga Kornievskaia } 415683ac665STrond Myklebust if (mech->gm_upcall_enctypes) { 416f8628220SKevin Coffman len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes); 417683ac665STrond Myklebust p += len; 418683ac665STrond Myklebust gss_msg->msg.len += len; 419683ac665STrond Myklebust } 4208b1c7bf5SOlga Kornievskaia len = sprintf(p, "\n"); 4218b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4228b1c7bf5SOlga Kornievskaia 42334769fc4S\"J. Bruce Fields\ gss_msg->msg.data = gss_msg->databuf; 42434769fc4S\"J. Bruce Fields\ BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); 42534769fc4S\"J. Bruce Fields\ } 42634769fc4S\"J. Bruce Fields\ 4278b1c7bf5SOlga Kornievskaia static void gss_encode_msg(struct gss_upcall_msg *gss_msg, 42868c97153STrond Myklebust struct rpc_clnt *clnt, 42968c97153STrond Myklebust const char *service_name) 43034769fc4S\"J. Bruce Fields\ { 43134769fc4S\"J. Bruce Fields\ if (pipe_version == 0) 43234769fc4S\"J. Bruce Fields\ gss_encode_v0_msg(gss_msg); 43334769fc4S\"J. Bruce Fields\ else /* pipe_version == 1 */ 43468c97153STrond Myklebust gss_encode_v1_msg(gss_msg, clnt, service_name); 43534769fc4S\"J. Bruce Fields\ } 43634769fc4S\"J. Bruce Fields\ 43768c97153STrond Myklebust static struct gss_upcall_msg * 43868c97153STrond Myklebust gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt, 43968c97153STrond Myklebust uid_t uid, const char *service_name) 4401da177e4SLinus Torvalds { 4411da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 44279a3f20bS\"J. Bruce Fields\ int vers; 4431da177e4SLinus Torvalds 4440f38b873STrond Myklebust gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 445db75b3d6S\"J. Bruce Fields\ if (gss_msg == NULL) 446db75b3d6S\"J. Bruce Fields\ return ERR_PTR(-ENOMEM); 44779a3f20bS\"J. Bruce Fields\ vers = get_pipe_version(); 44879a3f20bS\"J. Bruce Fields\ if (vers < 0) { 44979a3f20bS\"J. Bruce Fields\ kfree(gss_msg); 45079a3f20bS\"J. Bruce Fields\ return ERR_PTR(vers); 45179a3f20bS\"J. Bruce Fields\ } 452c239d83bSStanislav Kinsbursky gss_msg->pipe = gss_auth->pipe[vers]; 4531da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 4541da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 4551da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 4561da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 4571da177e4SLinus Torvalds gss_msg->uid = uid; 4581da177e4SLinus Torvalds gss_msg->auth = gss_auth; 45968c97153STrond Myklebust gss_encode_msg(gss_msg, clnt, service_name); 4601da177e4SLinus Torvalds return gss_msg; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds static struct gss_upcall_msg * 4641da177e4SLinus Torvalds gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 4651da177e4SLinus Torvalds { 4667c67db3aSTrond Myklebust struct gss_cred *gss_cred = container_of(cred, 4677c67db3aSTrond Myklebust struct gss_cred, gc_base); 4681da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 4697c67db3aSTrond Myklebust uid_t uid = cred->cr_uid; 4701da177e4SLinus Torvalds 47168c97153STrond Myklebust gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal); 472db75b3d6S\"J. Bruce Fields\ if (IS_ERR(gss_new)) 473db75b3d6S\"J. Bruce Fields\ return gss_new; 474053e324fSSuresh Jayaraman gss_msg = gss_add_msg(gss_new); 4751da177e4SLinus Torvalds if (gss_msg == gss_new) { 4769beae467SStanislav Kinsbursky int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); 4771da177e4SLinus Torvalds if (res) { 4781da177e4SLinus Torvalds gss_unhash_msg(gss_new); 4791da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds } else 4821da177e4SLinus Torvalds gss_release_msg(gss_new); 4831da177e4SLinus Torvalds return gss_msg; 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds 486b03568c3S\"J. Bruce Fields\ static void warn_gssd(void) 487b03568c3S\"J. Bruce Fields\ { 488b03568c3S\"J. Bruce Fields\ static unsigned long ratelimit; 489b03568c3S\"J. Bruce Fields\ unsigned long now = jiffies; 490b03568c3S\"J. Bruce Fields\ 491b03568c3S\"J. Bruce Fields\ if (time_after(now, ratelimit)) { 492b03568c3S\"J. Bruce Fields\ printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 493b03568c3S\"J. Bruce Fields\ "Please check user daemon is running.\n"); 494b03568c3S\"J. Bruce Fields\ ratelimit = now + 15*HZ; 495b03568c3S\"J. Bruce Fields\ } 496b03568c3S\"J. Bruce Fields\ } 497b03568c3S\"J. Bruce Fields\ 4981da177e4SLinus Torvalds static inline int 4991da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 5001da177e4SLinus Torvalds { 501a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 5024a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 5031da177e4SLinus Torvalds struct gss_auth, rpc_auth); 5041da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 5051da177e4SLinus Torvalds struct gss_cred, gc_base); 5061da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5079beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 5081da177e4SLinus Torvalds int err = 0; 5091da177e4SLinus Torvalds 5108885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 5118885cb36SChuck Lever cred->cr_uid); 5121da177e4SLinus Torvalds gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 513480e3243SRoel Kluin if (PTR_ERR(gss_msg) == -EAGAIN) { 51479a3f20bS\"J. Bruce Fields\ /* XXX: warning on the first, under the assumption we 51579a3f20bS\"J. Bruce Fields\ * shouldn't normally hit this case on a refresh. */ 51679a3f20bS\"J. Bruce Fields\ warn_gssd(); 51779a3f20bS\"J. Bruce Fields\ task->tk_timeout = 15*HZ; 51879a3f20bS\"J. Bruce Fields\ rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); 519d1a8016aSBryan Schumaker return -EAGAIN; 52079a3f20bS\"J. Bruce Fields\ } 5211da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 5221da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 5231da177e4SLinus Torvalds goto out; 5241da177e4SLinus Torvalds } 5259beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 5269beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 5271da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 5285d00837bSTrond Myklebust rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 529126e216aSTrond Myklebust else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 5301da177e4SLinus Torvalds task->tk_timeout = 0; 5311da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 5321da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 5331da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5345d00837bSTrond Myklebust rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 535126e216aSTrond Myklebust } else { 536126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 5371da177e4SLinus Torvalds err = gss_msg->msg.errno; 538126e216aSTrond Myklebust } 5399beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 5401da177e4SLinus Torvalds gss_release_msg(gss_msg); 5411da177e4SLinus Torvalds out: 5428885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 5438885cb36SChuck Lever task->tk_pid, cred->cr_uid, err); 5441da177e4SLinus Torvalds return err; 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds static inline int 5481da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 5491da177e4SLinus Torvalds { 5509beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 5511da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 5521da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5531da177e4SLinus Torvalds DEFINE_WAIT(wait); 5541da177e4SLinus Torvalds int err = 0; 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 55779a3f20bS\"J. Bruce Fields\ retry: 5581da177e4SLinus Torvalds gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 55979a3f20bS\"J. Bruce Fields\ if (PTR_ERR(gss_msg) == -EAGAIN) { 56079a3f20bS\"J. Bruce Fields\ err = wait_event_interruptible_timeout(pipe_version_waitqueue, 56179a3f20bS\"J. Bruce Fields\ pipe_version >= 0, 15*HZ); 562d1a8016aSBryan Schumaker if (pipe_version < 0) { 563d1a8016aSBryan Schumaker warn_gssd(); 564d1a8016aSBryan Schumaker err = -EACCES; 565d1a8016aSBryan Schumaker } 56679a3f20bS\"J. Bruce Fields\ if (err) 56779a3f20bS\"J. Bruce Fields\ goto out; 56879a3f20bS\"J. Bruce Fields\ goto retry; 56979a3f20bS\"J. Bruce Fields\ } 5701da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 5711da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 5721da177e4SLinus Torvalds goto out; 5731da177e4SLinus Torvalds } 5749beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 5751da177e4SLinus Torvalds for (;;) { 5765afa9133STrond Myklebust prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); 5779beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 5781da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 5791da177e4SLinus Torvalds break; 5801da177e4SLinus Torvalds } 5819beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 5825afa9133STrond Myklebust if (fatal_signal_pending(current)) { 5831da177e4SLinus Torvalds err = -ERESTARTSYS; 5841da177e4SLinus Torvalds goto out_intr; 5851da177e4SLinus Torvalds } 5861da177e4SLinus Torvalds schedule(); 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds if (gss_msg->ctx) 5897b6962b0STrond Myklebust gss_cred_set_ctx(cred, gss_msg->ctx); 5901da177e4SLinus Torvalds else 5911da177e4SLinus Torvalds err = gss_msg->msg.errno; 5929beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 5931da177e4SLinus Torvalds out_intr: 5941da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 5951da177e4SLinus Torvalds gss_release_msg(gss_msg); 5961da177e4SLinus Torvalds out: 5978885cb36SChuck Lever dprintk("RPC: gss_create_upcall for uid %u result %d\n", 5988885cb36SChuck Lever cred->cr_uid, err); 5991da177e4SLinus Torvalds return err; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds static ssize_t 6051da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 6061da177e4SLinus Torvalds { 6071da177e4SLinus Torvalds const void *p, *end; 6081da177e4SLinus Torvalds void *buf; 6091da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 6109beae467SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(filp->f_dentry->d_inode)->pipe; 6111da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 6121da177e4SLinus Torvalds uid_t uid; 6133b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 6161da177e4SLinus Torvalds goto out; 6171da177e4SLinus Torvalds err = -ENOMEM; 6180f38b873STrond Myklebust buf = kmalloc(mlen, GFP_NOFS); 6191da177e4SLinus Torvalds if (!buf) 6201da177e4SLinus Torvalds goto out; 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds err = -EFAULT; 6231da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 6241da177e4SLinus Torvalds goto err; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 6271da177e4SLinus Torvalds p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 6281da177e4SLinus Torvalds if (IS_ERR(p)) { 6291da177e4SLinus Torvalds err = PTR_ERR(p); 6301da177e4SLinus Torvalds goto err; 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds err = -ENOMEM; 6341da177e4SLinus Torvalds ctx = gss_alloc_context(); 6351da177e4SLinus Torvalds if (ctx == NULL) 6361da177e4SLinus Torvalds goto err; 6373b68aaeaSTrond Myklebust 6383b68aaeaSTrond Myklebust err = -ENOENT; 6393b68aaeaSTrond Myklebust /* Find a matching upcall */ 6409beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 6419beae467SStanislav Kinsbursky gss_msg = __gss_find_upcall(pipe, uid); 6423b68aaeaSTrond Myklebust if (gss_msg == NULL) { 6439beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6443b68aaeaSTrond Myklebust goto err_put_ctx; 6453b68aaeaSTrond Myklebust } 6463b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 6479beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6483b68aaeaSTrond Myklebust 6496e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 6501da177e4SLinus Torvalds if (IS_ERR(p)) { 6511da177e4SLinus Torvalds err = PTR_ERR(p); 652486bad2eSJeff Layton switch (err) { 653486bad2eSJeff Layton case -EACCES: 654dc5ddce9SJeff Layton case -EKEYEXPIRED: 655486bad2eSJeff Layton gss_msg->msg.errno = err; 656486bad2eSJeff Layton err = mlen; 657486bad2eSJeff Layton break; 658486bad2eSJeff Layton case -EFAULT: 659486bad2eSJeff Layton case -ENOMEM: 660486bad2eSJeff Layton case -EINVAL: 661486bad2eSJeff Layton case -ENOSYS: 662486bad2eSJeff Layton gss_msg->msg.errno = -EAGAIN; 663486bad2eSJeff Layton break; 664486bad2eSJeff Layton default: 665486bad2eSJeff Layton printk(KERN_CRIT "%s: bad return from " 6666c853099SRandy Dunlap "gss_fill_context: %zd\n", __func__, err); 667486bad2eSJeff Layton BUG(); 668486bad2eSJeff Layton } 6693b68aaeaSTrond Myklebust goto err_release_msg; 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 6723b68aaeaSTrond Myklebust err = mlen; 6733b68aaeaSTrond Myklebust 6743b68aaeaSTrond Myklebust err_release_msg: 6759beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 6761da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 6779beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6781da177e4SLinus Torvalds gss_release_msg(gss_msg); 6791da177e4SLinus Torvalds err_put_ctx: 6801da177e4SLinus Torvalds gss_put_ctx(ctx); 6811da177e4SLinus Torvalds err: 6821da177e4SLinus Torvalds kfree(buf); 6831da177e4SLinus Torvalds out: 6843b68aaeaSTrond Myklebust dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 6851da177e4SLinus Torvalds return err; 6861da177e4SLinus Torvalds } 6871da177e4SLinus Torvalds 68834769fc4S\"J. Bruce Fields\ static int gss_pipe_open(struct inode *inode, int new_version) 689cf81939dS\"J. Bruce Fields\ { 69034769fc4S\"J. Bruce Fields\ int ret = 0; 69134769fc4S\"J. Bruce Fields\ 69279a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 69379a3f20bS\"J. Bruce Fields\ if (pipe_version < 0) { 69434769fc4S\"J. Bruce Fields\ /* First open of any gss pipe determines the version: */ 69534769fc4S\"J. Bruce Fields\ pipe_version = new_version; 69679a3f20bS\"J. Bruce Fields\ rpc_wake_up(&pipe_version_rpc_waitqueue); 69779a3f20bS\"J. Bruce Fields\ wake_up(&pipe_version_waitqueue); 69834769fc4S\"J. Bruce Fields\ } else if (pipe_version != new_version) { 69934769fc4S\"J. Bruce Fields\ /* Trying to open a pipe of a different version */ 70034769fc4S\"J. Bruce Fields\ ret = -EBUSY; 70134769fc4S\"J. Bruce Fields\ goto out; 70279a3f20bS\"J. Bruce Fields\ } 703cf81939dS\"J. Bruce Fields\ atomic_inc(&pipe_users); 70434769fc4S\"J. Bruce Fields\ out: 70579a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 70634769fc4S\"J. Bruce Fields\ return ret; 70734769fc4S\"J. Bruce Fields\ 70834769fc4S\"J. Bruce Fields\ } 70934769fc4S\"J. Bruce Fields\ 71034769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v0(struct inode *inode) 71134769fc4S\"J. Bruce Fields\ { 71234769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 0); 71334769fc4S\"J. Bruce Fields\ } 71434769fc4S\"J. Bruce Fields\ 71534769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v1(struct inode *inode) 71634769fc4S\"J. Bruce Fields\ { 71734769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 1); 718cf81939dS\"J. Bruce Fields\ } 719cf81939dS\"J. Bruce Fields\ 7201da177e4SLinus Torvalds static void 7211da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 7221da177e4SLinus Torvalds { 7239beae467SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 7241da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 7251da177e4SLinus Torvalds 7265a67657aSTrond Myklebust restart: 7279beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7289beae467SStanislav Kinsbursky list_for_each_entry(gss_msg, &pipe->in_downcall, list) { 7296e84c7b6STrond Myklebust 7305a67657aSTrond Myklebust if (!list_empty(&gss_msg->msg.list)) 7315a67657aSTrond Myklebust continue; 7321da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 7331da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 7341da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 7359beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7361da177e4SLinus Torvalds gss_release_msg(gss_msg); 7375a67657aSTrond Myklebust goto restart; 7381da177e4SLinus Torvalds } 7399beae467SStanislav Kinsbursky spin_unlock(&pipe->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\ */ 802c239d83bSStanislav Kinsbursky gss_auth->pipe[1] = rpc_mkpipe_data(&gss_upcall_ops_v1, 80334769fc4S\"J. Bruce Fields\ RPC_PIPE_WAIT_FOR_OPEN); 804c239d83bSStanislav Kinsbursky if (IS_ERR(gss_auth->pipe[1])) { 805c239d83bSStanislav Kinsbursky err = PTR_ERR(gss_auth->pipe[1]); 8061da177e4SLinus Torvalds goto err_put_mech; 8076a19275aSJ. Bruce Fields } 8081da177e4SLinus Torvalds 809c239d83bSStanislav Kinsbursky gss_auth->pipe[0] = rpc_mkpipe_data(&gss_upcall_ops_v0, 81034769fc4S\"J. Bruce Fields\ RPC_PIPE_WAIT_FOR_OPEN); 811c239d83bSStanislav Kinsbursky if (IS_ERR(gss_auth->pipe[0])) { 812c239d83bSStanislav Kinsbursky err = PTR_ERR(gss_auth->pipe[0]); 813c239d83bSStanislav Kinsbursky goto err_destroy_pipe_1; 814c239d83bSStanislav Kinsbursky } 815c239d83bSStanislav Kinsbursky 816c239d83bSStanislav Kinsbursky gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_path.dentry, 817c239d83bSStanislav Kinsbursky "gssd", 818c239d83bSStanislav Kinsbursky clnt, gss_auth->pipe[1]); 819c239d83bSStanislav Kinsbursky if (IS_ERR(gss_auth->pipe[1]->dentry)) { 820c239d83bSStanislav Kinsbursky err = PTR_ERR(gss_auth->pipe[1]->dentry); 821c239d83bSStanislav Kinsbursky goto err_destroy_pipe_0; 822c239d83bSStanislav Kinsbursky } 823c239d83bSStanislav Kinsbursky 824c239d83bSStanislav Kinsbursky gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_path.dentry, 825c239d83bSStanislav Kinsbursky gss_auth->mech->gm_name, 826c239d83bSStanislav Kinsbursky clnt, gss_auth->pipe[0]); 827c239d83bSStanislav Kinsbursky if (IS_ERR(gss_auth->pipe[0]->dentry)) { 828c239d83bSStanislav Kinsbursky err = PTR_ERR(gss_auth->pipe[0]->dentry); 82934769fc4S\"J. Bruce Fields\ goto err_unlink_pipe_1; 83034769fc4S\"J. Bruce Fields\ } 831f5c2187cSTrond Myklebust err = rpcauth_init_credcache(auth); 83207a2bf1dSTrond Myklebust if (err) 83334769fc4S\"J. Bruce Fields\ goto err_unlink_pipe_0; 83407a2bf1dSTrond Myklebust 8351da177e4SLinus Torvalds return auth; 83634769fc4S\"J. Bruce Fields\ err_unlink_pipe_0: 837c239d83bSStanislav Kinsbursky rpc_unlink(gss_auth->pipe[0]->dentry); 83834769fc4S\"J. Bruce Fields\ err_unlink_pipe_1: 839c239d83bSStanislav Kinsbursky rpc_unlink(gss_auth->pipe[1]->dentry); 840c239d83bSStanislav Kinsbursky err_destroy_pipe_0: 841c239d83bSStanislav Kinsbursky rpc_destroy_pipe_data(gss_auth->pipe[0]); 842c239d83bSStanislav Kinsbursky err_destroy_pipe_1: 843c239d83bSStanislav Kinsbursky rpc_destroy_pipe_data(gss_auth->pipe[1]); 8441da177e4SLinus Torvalds err_put_mech: 8451da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 8461da177e4SLinus Torvalds err_free: 8471da177e4SLinus Torvalds kfree(gss_auth); 8481da177e4SLinus Torvalds out_dec: 8491da177e4SLinus Torvalds module_put(THIS_MODULE); 8506a19275aSJ. Bruce Fields return ERR_PTR(err); 8511da177e4SLinus Torvalds } 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds static void 8540285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 8550285ed1fSTrond Myklebust { 856c239d83bSStanislav Kinsbursky rpc_unlink(gss_auth->pipe[0]->dentry); 857c239d83bSStanislav Kinsbursky rpc_unlink(gss_auth->pipe[1]->dentry); 858c239d83bSStanislav Kinsbursky rpc_destroy_pipe_data(gss_auth->pipe[0]); 859c239d83bSStanislav Kinsbursky rpc_destroy_pipe_data(gss_auth->pipe[1]); 8600285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 8610285ed1fSTrond Myklebust 8620285ed1fSTrond Myklebust kfree(gss_auth); 8630285ed1fSTrond Myklebust module_put(THIS_MODULE); 8640285ed1fSTrond Myklebust } 8650285ed1fSTrond Myklebust 8660285ed1fSTrond Myklebust static void 8670285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 8680285ed1fSTrond Myklebust { 8690285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 8700285ed1fSTrond Myklebust 8710285ed1fSTrond Myklebust gss_free(gss_auth); 8720285ed1fSTrond Myklebust } 8730285ed1fSTrond Myklebust 8740285ed1fSTrond Myklebust static void 8751da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 8761da177e4SLinus Torvalds { 8771da177e4SLinus Torvalds struct gss_auth *gss_auth; 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 8801da177e4SLinus Torvalds auth, auth->au_flavor); 8811da177e4SLinus Torvalds 8823ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 8833ab9bb72STrond Myklebust 8841da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 8850285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 8861da177e4SLinus Torvalds } 8871da177e4SLinus Torvalds 8880df7fb74STrond Myklebust /* 8890df7fb74STrond Myklebust * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 8900df7fb74STrond Myklebust * to the server with the GSS control procedure field set to 8910df7fb74STrond Myklebust * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 8920df7fb74STrond Myklebust * all RPCSEC_GSS state associated with that context. 8930df7fb74STrond Myklebust */ 8940df7fb74STrond Myklebust static int 8950df7fb74STrond Myklebust gss_destroying_context(struct rpc_cred *cred) 8960df7fb74STrond Myklebust { 8970df7fb74STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 8980df7fb74STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 8990df7fb74STrond Myklebust struct rpc_task *task; 9000df7fb74STrond Myklebust 9010df7fb74STrond Myklebust if (gss_cred->gc_ctx == NULL || 9026dcd3926SJeff Layton test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 9030df7fb74STrond Myklebust return 0; 9040df7fb74STrond Myklebust 9050df7fb74STrond Myklebust gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 9060df7fb74STrond Myklebust cred->cr_ops = &gss_nullops; 9070df7fb74STrond Myklebust 9080df7fb74STrond Myklebust /* Take a reference to ensure the cred will be destroyed either 9090df7fb74STrond Myklebust * by the RPC call or by the put_rpccred() below */ 9100df7fb74STrond Myklebust get_rpccred(cred); 9110df7fb74STrond Myklebust 912080a1f14STrond Myklebust task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 9130df7fb74STrond Myklebust if (!IS_ERR(task)) 9140df7fb74STrond Myklebust rpc_put_task(task); 9150df7fb74STrond Myklebust 9160df7fb74STrond Myklebust put_rpccred(cred); 9170df7fb74STrond Myklebust return 1; 9180df7fb74STrond Myklebust } 9190df7fb74STrond Myklebust 9200df7fb74STrond Myklebust /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 9211da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 9221da177e4SLinus Torvalds * allocated before freeing them. */ 9231da177e4SLinus Torvalds static void 9245d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 9251da177e4SLinus Torvalds { 9265d28dc82STrond Myklebust dprintk("RPC: gss_free_ctx\n"); 9271da177e4SLinus Torvalds 9280d8a3746STrond Myklebust gss_delete_sec_context(&ctx->gc_gss_ctx); 9291da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 9301da177e4SLinus Torvalds kfree(ctx); 9311da177e4SLinus Torvalds } 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds static void 9345d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 9355d28dc82STrond Myklebust { 9365d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 9375d28dc82STrond Myklebust gss_do_free_ctx(ctx); 9385d28dc82STrond Myklebust } 9395d28dc82STrond Myklebust 9405d28dc82STrond Myklebust static void 9415d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 9425d28dc82STrond Myklebust { 9435d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 9445d28dc82STrond Myklebust } 9455d28dc82STrond Myklebust 9465d28dc82STrond Myklebust static void 94731be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 9481da177e4SLinus Torvalds { 94931be5bf1STrond Myklebust dprintk("RPC: gss_free_cred %p\n", gss_cred); 95031be5bf1STrond Myklebust kfree(gss_cred); 95131be5bf1STrond Myklebust } 9521da177e4SLinus Torvalds 95331be5bf1STrond Myklebust static void 95431be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 95531be5bf1STrond Myklebust { 95631be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 95731be5bf1STrond Myklebust gss_free_cred(gss_cred); 95831be5bf1STrond Myklebust } 9591da177e4SLinus Torvalds 96031be5bf1STrond Myklebust static void 9616dcd3926SJeff Layton gss_destroy_nullcred(struct rpc_cred *cred) 96231be5bf1STrond Myklebust { 9635d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 9640285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 9655d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 9665d28dc82STrond Myklebust 967a9b3cd7fSStephen Hemminger RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); 96831be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 9695d28dc82STrond Myklebust if (ctx) 9705d28dc82STrond Myklebust gss_put_ctx(ctx); 9710285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds 9746dcd3926SJeff Layton static void 9756dcd3926SJeff Layton gss_destroy_cred(struct rpc_cred *cred) 9766dcd3926SJeff Layton { 9776dcd3926SJeff Layton 9786dcd3926SJeff Layton if (gss_destroying_context(cred)) 9796dcd3926SJeff Layton return; 9806dcd3926SJeff Layton gss_destroy_nullcred(cred); 9816dcd3926SJeff Layton } 9826dcd3926SJeff Layton 9831da177e4SLinus Torvalds /* 9841da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 9851da177e4SLinus Torvalds */ 9861da177e4SLinus Torvalds static struct rpc_cred * 9878a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 9881da177e4SLinus Torvalds { 9898a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 9901da177e4SLinus Torvalds } 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds static struct rpc_cred * 9938a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 9941da177e4SLinus Torvalds { 9951da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 9961da177e4SLinus Torvalds struct gss_cred *cred = NULL; 9971da177e4SLinus Torvalds int err = -ENOMEM; 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 10001da177e4SLinus Torvalds acred->uid, auth->au_flavor); 10011da177e4SLinus Torvalds 10020f38b873STrond Myklebust if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 10031da177e4SLinus Torvalds goto out_err; 10041da177e4SLinus Torvalds 10055fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 10061da177e4SLinus Torvalds /* 10071da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 10081da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 10091da177e4SLinus Torvalds */ 1010fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 10111da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 101268c97153STrond Myklebust cred->gc_principal = NULL; 101368c97153STrond Myklebust if (acred->machine_cred) 101468c97153STrond Myklebust cred->gc_principal = acred->principal; 10150285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 10161da177e4SLinus Torvalds return &cred->gc_base; 10171da177e4SLinus Torvalds 10181da177e4SLinus Torvalds out_err: 10191da177e4SLinus Torvalds dprintk("RPC: gss_create_cred failed with error %d\n", err); 10201da177e4SLinus Torvalds return ERR_PTR(err); 10211da177e4SLinus Torvalds } 10221da177e4SLinus Torvalds 10231da177e4SLinus Torvalds static int 1024fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 1025fba3bad4STrond Myklebust { 1026fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 1027fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 1028fba3bad4STrond Myklebust int err; 1029fba3bad4STrond Myklebust 1030fba3bad4STrond Myklebust do { 1031fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 1032fba3bad4STrond Myklebust } while (err == -EAGAIN); 1033fba3bad4STrond Myklebust return err; 1034fba3bad4STrond Myklebust } 1035fba3bad4STrond Myklebust 1036fba3bad4STrond Myklebust static int 10378a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 10381da177e4SLinus Torvalds { 10391da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 10401da177e4SLinus Torvalds 1041cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 10428a317760STrond Myklebust goto out; 10431da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 1044cd019f75STrond Myklebust if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 1045cd019f75STrond Myklebust return 0; 1046cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 10471da177e4SLinus Torvalds return 0; 10488a317760STrond Myklebust out: 104968c97153STrond Myklebust if (acred->principal != NULL) { 105068c97153STrond Myklebust if (gss_cred->gc_principal == NULL) 105168c97153STrond Myklebust return 0; 105268c97153STrond Myklebust return strcmp(acred->principal, gss_cred->gc_principal) == 0; 105368c97153STrond Myklebust } 105468c97153STrond Myklebust if (gss_cred->gc_principal != NULL) 10557c67db3aSTrond Myklebust return 0; 1056a02cec21SEric Dumazet return rc->cr_uid == acred->uid; 10571da177e4SLinus Torvalds } 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds /* 10601da177e4SLinus Torvalds * Marshal credentials. 10611da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 10621da177e4SLinus Torvalds */ 1063d8ed029dSAlexey Dobriyan static __be32 * 1064d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 10651da177e4SLinus Torvalds { 1066a17c2153STrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 1067a17c2153STrond Myklebust struct rpc_cred *cred = req->rq_cred; 10681da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 10691da177e4SLinus Torvalds gc_base); 10701da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1071d8ed029dSAlexey Dobriyan __be32 *cred_len; 10721da177e4SLinus Torvalds u32 maj_stat = 0; 10731da177e4SLinus Torvalds struct xdr_netobj mic; 10741da177e4SLinus Torvalds struct kvec iov; 10751da177e4SLinus Torvalds struct xdr_buf verf_buf; 10761da177e4SLinus Torvalds 10778885cb36SChuck Lever dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 10801da177e4SLinus Torvalds cred_len = p++; 10811da177e4SLinus Torvalds 10821da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 10831da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 10841da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 10851da177e4SLinus Torvalds 10861da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 10871da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 10881da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 10891da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 10901da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 10911da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 10921da177e4SLinus Torvalds 10931da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 10941da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 1095808012fbSChuck Lever iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 1096808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 10971da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 10981da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 10991da177e4SLinus Torvalds 11001da177e4SLinus Torvalds /* set verifier flavor*/ 11011da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 110400fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 11051da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 1106fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11071da177e4SLinus Torvalds } else if (maj_stat != 0) { 11081da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 11091da177e4SLinus Torvalds goto out_put_ctx; 11101da177e4SLinus Torvalds } 11111da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 11121da177e4SLinus Torvalds gss_put_ctx(ctx); 11131da177e4SLinus Torvalds return p; 11141da177e4SLinus Torvalds out_put_ctx: 11151da177e4SLinus Torvalds gss_put_ctx(ctx); 11161da177e4SLinus Torvalds return NULL; 11171da177e4SLinus Torvalds } 11181da177e4SLinus Torvalds 1119cd019f75STrond Myklebust static int gss_renew_cred(struct rpc_task *task) 1120cd019f75STrond Myklebust { 1121a17c2153STrond Myklebust struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; 1122cd019f75STrond Myklebust struct gss_cred *gss_cred = container_of(oldcred, 1123cd019f75STrond Myklebust struct gss_cred, 1124cd019f75STrond Myklebust gc_base); 1125cd019f75STrond Myklebust struct rpc_auth *auth = oldcred->cr_auth; 1126cd019f75STrond Myklebust struct auth_cred acred = { 1127cd019f75STrond Myklebust .uid = oldcred->cr_uid, 112868c97153STrond Myklebust .principal = gss_cred->gc_principal, 112968c97153STrond Myklebust .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), 1130cd019f75STrond Myklebust }; 1131cd019f75STrond Myklebust struct rpc_cred *new; 1132cd019f75STrond Myklebust 1133cd019f75STrond Myklebust new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 1134cd019f75STrond Myklebust if (IS_ERR(new)) 1135cd019f75STrond Myklebust return PTR_ERR(new); 1136a17c2153STrond Myklebust task->tk_rqstp->rq_cred = new; 1137cd019f75STrond Myklebust put_rpccred(oldcred); 1138cd019f75STrond Myklebust return 0; 1139cd019f75STrond Myklebust } 1140cd019f75STrond Myklebust 1141126e216aSTrond Myklebust static int gss_cred_is_negative_entry(struct rpc_cred *cred) 1142126e216aSTrond Myklebust { 1143126e216aSTrond Myklebust if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { 1144126e216aSTrond Myklebust unsigned long now = jiffies; 1145126e216aSTrond Myklebust unsigned long begin, expire; 1146126e216aSTrond Myklebust struct gss_cred *gss_cred; 1147126e216aSTrond Myklebust 1148126e216aSTrond Myklebust gss_cred = container_of(cred, struct gss_cred, gc_base); 1149126e216aSTrond Myklebust begin = gss_cred->gc_upcall_timestamp; 1150126e216aSTrond Myklebust expire = begin + gss_expired_cred_retry_delay * HZ; 1151126e216aSTrond Myklebust 1152126e216aSTrond Myklebust if (time_in_range_open(now, begin, expire)) 1153126e216aSTrond Myklebust return 1; 1154126e216aSTrond Myklebust } 1155126e216aSTrond Myklebust return 0; 1156126e216aSTrond Myklebust } 1157126e216aSTrond Myklebust 11581da177e4SLinus Torvalds /* 11591da177e4SLinus Torvalds * Refresh credentials. XXX - finish 11601da177e4SLinus Torvalds */ 11611da177e4SLinus Torvalds static int 11621da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 11631da177e4SLinus Torvalds { 1164a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 1165cd019f75STrond Myklebust int ret = 0; 11661da177e4SLinus Torvalds 1167126e216aSTrond Myklebust if (gss_cred_is_negative_entry(cred)) 1168126e216aSTrond Myklebust return -EKEYEXPIRED; 1169126e216aSTrond Myklebust 1170cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 1171cd019f75STrond Myklebust !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 1172cd019f75STrond Myklebust ret = gss_renew_cred(task); 1173cd019f75STrond Myklebust if (ret < 0) 1174cd019f75STrond Myklebust goto out; 1175a17c2153STrond Myklebust cred = task->tk_rqstp->rq_cred; 1176cd019f75STrond Myklebust } 1177cd019f75STrond Myklebust 1178cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 1179cd019f75STrond Myklebust ret = gss_refresh_upcall(task); 1180cd019f75STrond Myklebust out: 1181cd019f75STrond Myklebust return ret; 11821da177e4SLinus Torvalds } 11831da177e4SLinus Torvalds 11840df7fb74STrond Myklebust /* Dummy refresh routine: used only when destroying the context */ 11850df7fb74STrond Myklebust static int 11860df7fb74STrond Myklebust gss_refresh_null(struct rpc_task *task) 11870df7fb74STrond Myklebust { 11880df7fb74STrond Myklebust return -EACCES; 11890df7fb74STrond Myklebust } 11900df7fb74STrond Myklebust 1191d8ed029dSAlexey Dobriyan static __be32 * 1192d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 11931da177e4SLinus Torvalds { 1194a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 11951da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1196d8ed029dSAlexey Dobriyan __be32 seq; 11971da177e4SLinus Torvalds struct kvec iov; 11981da177e4SLinus Torvalds struct xdr_buf verf_buf; 11991da177e4SLinus Torvalds struct xdr_netobj mic; 12001da177e4SLinus Torvalds u32 flav,len; 12011da177e4SLinus Torvalds u32 maj_stat; 12021da177e4SLinus Torvalds 12038885cb36SChuck Lever dprintk("RPC: %5u gss_validate\n", task->tk_pid); 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds flav = ntohl(*p++); 12061da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 12071da177e4SLinus Torvalds goto out_bad; 12081da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 12091da177e4SLinus Torvalds goto out_bad; 12101da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 12111da177e4SLinus Torvalds iov.iov_base = &seq; 12121da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 12131da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 12141da177e4SLinus Torvalds mic.data = (u8 *)p; 12151da177e4SLinus Torvalds mic.len = len; 12161da177e4SLinus Torvalds 121700fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 12181da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1219fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 12200df7fb74STrond Myklebust if (maj_stat) { 12210df7fb74STrond Myklebust dprintk("RPC: %5u gss_validate: gss_verify_mic returned " 12220df7fb74STrond Myklebust "error 0x%08x\n", task->tk_pid, maj_stat); 12231da177e4SLinus Torvalds goto out_bad; 12240df7fb74STrond Myklebust } 122524b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 122624b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 12271be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 12281da177e4SLinus Torvalds gss_put_ctx(ctx); 12298885cb36SChuck Lever dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 12301da177e4SLinus Torvalds task->tk_pid); 12311da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 12321da177e4SLinus Torvalds out_bad: 12331da177e4SLinus Torvalds gss_put_ctx(ctx); 12348885cb36SChuck Lever dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 12351da177e4SLinus Torvalds return NULL; 12361da177e4SLinus Torvalds } 12371da177e4SLinus Torvalds 12389f06c719SChuck Lever static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, 12399f06c719SChuck Lever __be32 *p, void *obj) 12409f06c719SChuck Lever { 12419f06c719SChuck Lever struct xdr_stream xdr; 12429f06c719SChuck Lever 12439f06c719SChuck Lever xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); 12449f06c719SChuck Lever encode(rqstp, &xdr, obj); 12459f06c719SChuck Lever } 12469f06c719SChuck Lever 12471da177e4SLinus Torvalds static inline int 12481da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 12499f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 12509f06c719SChuck Lever __be32 *p, void *obj) 12511da177e4SLinus Torvalds { 12521da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 12531da177e4SLinus Torvalds struct xdr_buf integ_buf; 1254d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 12551da177e4SLinus Torvalds struct xdr_netobj mic; 1256d8ed029dSAlexey Dobriyan u32 offset; 1257d8ed029dSAlexey Dobriyan __be32 *q; 12581da177e4SLinus Torvalds struct kvec *iov; 12591da177e4SLinus Torvalds u32 maj_stat = 0; 12601da177e4SLinus Torvalds int status = -EIO; 12611da177e4SLinus Torvalds 12621da177e4SLinus Torvalds integ_len = p++; 12631da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 12641da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 12651da177e4SLinus Torvalds 12669f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 12671da177e4SLinus Torvalds 12681da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 12691da177e4SLinus Torvalds offset, snd_buf->len - offset)) 12701da177e4SLinus Torvalds return status; 12711da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 12721da177e4SLinus Torvalds 12731da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 12741da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 12751da177e4SLinus Torvalds iov = snd_buf->tail; 12761da177e4SLinus Torvalds else 12771da177e4SLinus Torvalds iov = snd_buf->head; 12781da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 12791da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 12801da177e4SLinus Torvalds 128100fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 12821da177e4SLinus Torvalds status = -EIO; /* XXX? */ 12831da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1284fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 12851da177e4SLinus Torvalds else if (maj_stat) 12861da177e4SLinus Torvalds return status; 12871da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 12881da177e4SLinus Torvalds 12891da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 12901da177e4SLinus Torvalds iov->iov_len += offset; 12911da177e4SLinus Torvalds snd_buf->len += offset; 12921da177e4SLinus Torvalds return 0; 12931da177e4SLinus Torvalds } 12941da177e4SLinus Torvalds 12952d2da60cSJ. Bruce Fields static void 12962d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 12972d2da60cSJ. Bruce Fields { 12982d2da60cSJ. Bruce Fields int i; 12992d2da60cSJ. Bruce Fields 13002d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 13012d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 13022d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 13032d2da60cSJ. Bruce Fields } 13042d2da60cSJ. Bruce Fields 13052d2da60cSJ. Bruce Fields static int 13062d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 13072d2da60cSJ. Bruce Fields { 13082d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 13092d2da60cSJ. Bruce Fields int first, last, i; 13102d2da60cSJ. Bruce Fields 13112d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 13122d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 13132d2da60cSJ. Bruce Fields return 0; 13142d2da60cSJ. Bruce Fields } 13152d2da60cSJ. Bruce Fields 13162d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 13172d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 13182d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 13192d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 13202d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 13212d2da60cSJ. Bruce Fields GFP_NOFS); 13222d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 13232d2da60cSJ. Bruce Fields goto out; 13242d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 13252d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 13262d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 13272d2da60cSJ. Bruce Fields goto out_free; 13282d2da60cSJ. Bruce Fields } 13292d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 13302d2da60cSJ. Bruce Fields return 0; 13312d2da60cSJ. Bruce Fields out_free: 1332cdead7cfSTrond Myklebust rqstp->rq_enc_pages_num = i; 1333cdead7cfSTrond Myklebust priv_release_snd_buf(rqstp); 13342d2da60cSJ. Bruce Fields out: 13352d2da60cSJ. Bruce Fields return -EAGAIN; 13362d2da60cSJ. Bruce Fields } 13372d2da60cSJ. Bruce Fields 13382d2da60cSJ. Bruce Fields static inline int 13392d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 13409f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 13419f06c719SChuck Lever __be32 *p, void *obj) 13422d2da60cSJ. Bruce Fields { 13432d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 13442d2da60cSJ. Bruce Fields u32 offset; 13452d2da60cSJ. Bruce Fields u32 maj_stat; 13462d2da60cSJ. Bruce Fields int status; 1347d8ed029dSAlexey Dobriyan __be32 *opaque_len; 13482d2da60cSJ. Bruce Fields struct page **inpages; 13492d2da60cSJ. Bruce Fields int first; 13502d2da60cSJ. Bruce Fields int pad; 13512d2da60cSJ. Bruce Fields struct kvec *iov; 13522d2da60cSJ. Bruce Fields char *tmp; 13532d2da60cSJ. Bruce Fields 13542d2da60cSJ. Bruce Fields opaque_len = p++; 13552d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 13562d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 13572d2da60cSJ. Bruce Fields 13589f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 13592d2da60cSJ. Bruce Fields 13602d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 13612d2da60cSJ. Bruce Fields if (status) 13622d2da60cSJ. Bruce Fields return status; 13632d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 13642d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 13652d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 13662d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 13677561042fSKevin Coffman /* 13687561042fSKevin Coffman * Give the tail its own page, in case we need extra space in the 13697561042fSKevin Coffman * head when wrapping: 13707561042fSKevin Coffman * 13717561042fSKevin Coffman * call_allocate() allocates twice the slack space required 13727561042fSKevin Coffman * by the authentication flavor to rq_callsize. 13737561042fSKevin Coffman * For GSS, slack is GSS_CRED_SLACK. 13747561042fSKevin Coffman */ 13752d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 13762d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 13772d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 13782d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 13792d2da60cSJ. Bruce Fields } 138000fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 13817561042fSKevin Coffman /* slack space should prevent this ever happening: */ 13822d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 13832d2da60cSJ. Bruce Fields status = -EIO; 13842d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 13852d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 13862d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1387fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 13882d2da60cSJ. Bruce Fields else if (maj_stat) 13892d2da60cSJ. Bruce Fields return status; 13902d2da60cSJ. Bruce Fields 13912d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 13922d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 13932d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 13942d2da60cSJ. Bruce Fields iov = snd_buf->tail; 13952d2da60cSJ. Bruce Fields else 13962d2da60cSJ. Bruce Fields iov = snd_buf->head; 13972d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 13982d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 13992d2da60cSJ. Bruce Fields memset(p, 0, pad); 14002d2da60cSJ. Bruce Fields iov->iov_len += pad; 14012d2da60cSJ. Bruce Fields snd_buf->len += pad; 14022d2da60cSJ. Bruce Fields 14032d2da60cSJ. Bruce Fields return 0; 14042d2da60cSJ. Bruce Fields } 14052d2da60cSJ. Bruce Fields 14061da177e4SLinus Torvalds static int 14071da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 14089f06c719SChuck Lever kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) 14091da177e4SLinus Torvalds { 1410a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 14111da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 14121da177e4SLinus Torvalds gc_base); 14131da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 14141da177e4SLinus Torvalds int status = -EIO; 14151da177e4SLinus Torvalds 14168885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 14171da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 14181da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 14191da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 14201da177e4SLinus Torvalds */ 14219f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 14229f06c719SChuck Lever status = 0; 14231da177e4SLinus Torvalds goto out; 14241da177e4SLinus Torvalds } 14251da177e4SLinus Torvalds switch (gss_cred->gc_service) { 14261da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 14279f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 14289f06c719SChuck Lever status = 0; 14291da177e4SLinus Torvalds break; 14301da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 143189f0e4feSJoe Perches status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); 14321da177e4SLinus Torvalds break; 14331da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 143489f0e4feSJoe Perches status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); 14351da177e4SLinus Torvalds break; 14361da177e4SLinus Torvalds } 14371da177e4SLinus Torvalds out: 14381da177e4SLinus Torvalds gss_put_ctx(ctx); 14398885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 14401da177e4SLinus Torvalds return status; 14411da177e4SLinus Torvalds } 14421da177e4SLinus Torvalds 14431da177e4SLinus Torvalds static inline int 14441da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1445d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 14461da177e4SLinus Torvalds { 14471da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 14481da177e4SLinus Torvalds struct xdr_buf integ_buf; 14491da177e4SLinus Torvalds struct xdr_netobj mic; 14501da177e4SLinus Torvalds u32 data_offset, mic_offset; 14511da177e4SLinus Torvalds u32 integ_len; 14521da177e4SLinus Torvalds u32 maj_stat; 14531da177e4SLinus Torvalds int status = -EIO; 14541da177e4SLinus Torvalds 14551da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 14561da177e4SLinus Torvalds if (integ_len & 3) 14571da177e4SLinus Torvalds return status; 14581da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 14591da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 14601da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 14611da177e4SLinus Torvalds return status; 14621da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 14631da177e4SLinus Torvalds return status; 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 14661da177e4SLinus Torvalds mic_offset - data_offset)) 14671da177e4SLinus Torvalds return status; 14681da177e4SLinus Torvalds 14691da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 14701da177e4SLinus Torvalds return status; 14711da177e4SLinus Torvalds 147200fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 14731da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1474fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 14751da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 14761da177e4SLinus Torvalds return status; 14771da177e4SLinus Torvalds return 0; 14781da177e4SLinus Torvalds } 14791da177e4SLinus Torvalds 14802d2da60cSJ. Bruce Fields static inline int 14812d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1482d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 14832d2da60cSJ. Bruce Fields { 14842d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 14852d2da60cSJ. Bruce Fields u32 offset; 14862d2da60cSJ. Bruce Fields u32 opaque_len; 14872d2da60cSJ. Bruce Fields u32 maj_stat; 14882d2da60cSJ. Bruce Fields int status = -EIO; 14892d2da60cSJ. Bruce Fields 14902d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 14912d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 14922d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 14932d2da60cSJ. Bruce Fields return status; 14942d2da60cSJ. Bruce Fields /* remove padding: */ 14952d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 14962d2da60cSJ. Bruce Fields 149700fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 14982d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1499fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 15002d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 15012d2da60cSJ. Bruce Fields return status; 15022d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 15032d2da60cSJ. Bruce Fields return status; 15042d2da60cSJ. Bruce Fields 15052d2da60cSJ. Bruce Fields return 0; 15062d2da60cSJ. Bruce Fields } 15072d2da60cSJ. Bruce Fields 1508bf269551SChuck Lever static int 1509bf269551SChuck Lever gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, 1510bf269551SChuck Lever __be32 *p, void *obj) 1511bf269551SChuck Lever { 1512bf269551SChuck Lever struct xdr_stream xdr; 1513bf269551SChuck Lever 1514bf269551SChuck Lever xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); 1515bf269551SChuck Lever return decode(rqstp, &xdr, obj); 1516bf269551SChuck Lever } 15172d2da60cSJ. Bruce Fields 15181da177e4SLinus Torvalds static int 15191da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1520bf269551SChuck Lever kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) 15211da177e4SLinus Torvalds { 1522a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 15231da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 15241da177e4SLinus Torvalds gc_base); 15251da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1526d8ed029dSAlexey Dobriyan __be32 *savedp = p; 15272d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 15282d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 15291da177e4SLinus Torvalds int status = -EIO; 15301da177e4SLinus Torvalds 15311da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 15321da177e4SLinus Torvalds goto out_decode; 15331da177e4SLinus Torvalds switch (gss_cred->gc_service) { 15341da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 15351da177e4SLinus Torvalds break; 15361da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 15371da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 15381da177e4SLinus Torvalds if (status) 15391da177e4SLinus Torvalds goto out; 15401da177e4SLinus Torvalds break; 15411da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 15422d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 15432d2da60cSJ. Bruce Fields if (status) 15442d2da60cSJ. Bruce Fields goto out; 15451da177e4SLinus Torvalds break; 15461da177e4SLinus Torvalds } 154724b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 15481be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 15492d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 15501da177e4SLinus Torvalds out_decode: 1551bf269551SChuck Lever status = gss_unwrap_req_decode(decode, rqstp, p, obj); 15521da177e4SLinus Torvalds out: 15531da177e4SLinus Torvalds gss_put_ctx(ctx); 15548885cb36SChuck Lever dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 15551da177e4SLinus Torvalds status); 15561da177e4SLinus Torvalds return status; 15571da177e4SLinus Torvalds } 15581da177e4SLinus Torvalds 1559f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 15601da177e4SLinus Torvalds .owner = THIS_MODULE, 15611da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 15621da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 15631da177e4SLinus Torvalds .create = gss_create, 15641da177e4SLinus Torvalds .destroy = gss_destroy, 15651da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 15661da177e4SLinus Torvalds .crcreate = gss_create_cred 15671da177e4SLinus Torvalds }; 15681da177e4SLinus Torvalds 1569f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 15701da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 15711da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1572fba3bad4STrond Myklebust .cr_init = gss_cred_init, 15735c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 15741da177e4SLinus Torvalds .crmatch = gss_match, 15751da177e4SLinus Torvalds .crmarshal = gss_marshal, 15761da177e4SLinus Torvalds .crrefresh = gss_refresh, 15771da177e4SLinus Torvalds .crvalidate = gss_validate, 15781da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 15791da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 15801da177e4SLinus Torvalds }; 15811da177e4SLinus Torvalds 15820df7fb74STrond Myklebust static const struct rpc_credops gss_nullops = { 15830df7fb74STrond Myklebust .cr_name = "AUTH_GSS", 15846dcd3926SJeff Layton .crdestroy = gss_destroy_nullcred, 15855c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 15860df7fb74STrond Myklebust .crmatch = gss_match, 15870df7fb74STrond Myklebust .crmarshal = gss_marshal, 15880df7fb74STrond Myklebust .crrefresh = gss_refresh_null, 15890df7fb74STrond Myklebust .crvalidate = gss_validate, 15900df7fb74STrond Myklebust .crwrap_req = gss_wrap_req, 15910df7fb74STrond Myklebust .crunwrap_resp = gss_unwrap_resp, 15920df7fb74STrond Myklebust }; 15930df7fb74STrond Myklebust 1594b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0 = { 1595c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 15961da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 15971da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 159834769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v0, 159934769fc4S\"J. Bruce Fields\ .release_pipe = gss_pipe_release, 160034769fc4S\"J. Bruce Fields\ }; 160134769fc4S\"J. Bruce Fields\ 1602b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1 = { 1603c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 160434769fc4S\"J. Bruce Fields\ .downcall = gss_pipe_downcall, 160534769fc4S\"J. Bruce Fields\ .destroy_msg = gss_pipe_destroy_msg, 160634769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v1, 16071da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 16081da177e4SLinus Torvalds }; 16091da177e4SLinus Torvalds 16101da177e4SLinus Torvalds /* 16111da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 16121da177e4SLinus Torvalds */ 16131da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 16141da177e4SLinus Torvalds { 16151da177e4SLinus Torvalds int err = 0; 16161da177e4SLinus Torvalds 16171da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 16181da177e4SLinus Torvalds if (err) 16191da177e4SLinus Torvalds goto out; 16201da177e4SLinus Torvalds err = gss_svc_init(); 16211da177e4SLinus Torvalds if (err) 16221da177e4SLinus Torvalds goto out_unregister; 162379a3f20bS\"J. Bruce Fields\ rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); 16241da177e4SLinus Torvalds return 0; 16251da177e4SLinus Torvalds out_unregister: 16261da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 16271da177e4SLinus Torvalds out: 16281da177e4SLinus Torvalds return err; 16291da177e4SLinus Torvalds } 16301da177e4SLinus Torvalds 16311da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 16321da177e4SLinus Torvalds { 16331da177e4SLinus Torvalds gss_svc_shutdown(); 16341da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 1635bf12691dSJesper Dangaard Brouer rcu_barrier(); /* Wait for completion of call_rcu()'s */ 16361da177e4SLinus Torvalds } 16371da177e4SLinus Torvalds 16381da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1639126e216aSTrond Myklebust module_param_named(expired_cred_retry_delay, 1640126e216aSTrond Myklebust gss_expired_cred_retry_delay, 1641126e216aSTrond Myklebust uint, 0644); 1642126e216aSTrond Myklebust MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " 1643126e216aSTrond Myklebust "the RPC engine retries an expired credential"); 1644126e216aSTrond Myklebust 16451da177e4SLinus Torvalds module_init(init_rpcsec_gss) 16461da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1647