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> 54eb6dc19dSTrond Myklebust #include <linux/hashtable.h> 551da177e4SLinus Torvalds 56abfdbd53STrond Myklebust #include "../netns.h" 57abfdbd53STrond Myklebust 58f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops; 591da177e4SLinus Torvalds 60f1c0a861STrond Myklebust static const struct rpc_credops gss_credops; 610df7fb74STrond Myklebust static const struct rpc_credops gss_nullops; 621da177e4SLinus Torvalds 63126e216aSTrond Myklebust #define GSS_RETRY_EXPIRED 5 64126e216aSTrond Myklebust static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; 65126e216aSTrond Myklebust 664de6caa2SAndy Adamson #define GSS_KEY_EXPIRE_TIMEO 240 674de6caa2SAndy Adamson static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO; 684de6caa2SAndy Adamson 691da177e4SLinus Torvalds #ifdef RPC_DEBUG 701da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_AUTH 711da177e4SLinus Torvalds #endif 721da177e4SLinus Torvalds 73725f2865SKevin Coffman #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) 741da177e4SLinus Torvalds /* length of a krb5 verifier (48), plus data added before arguments when 751da177e4SLinus Torvalds * using integrity (two 4-byte integers): */ 76adeb8133SOlga Kornievskaia #define GSS_VERF_SLACK 100 771da177e4SLinus Torvalds 7823c323afSTrond Myklebust static DEFINE_HASHTABLE(gss_auth_hash_table, 4); 79eb6dc19dSTrond Myklebust static DEFINE_SPINLOCK(gss_auth_hash_lock); 80eb6dc19dSTrond Myklebust 8119172284STrond Myklebust struct gss_pipe { 8219172284STrond Myklebust struct rpc_pipe_dir_object pdo; 8319172284STrond Myklebust struct rpc_pipe *pipe; 8419172284STrond Myklebust struct rpc_clnt *clnt; 8519172284STrond Myklebust const char *name; 86414a6295STrond Myklebust struct kref kref; 8719172284STrond Myklebust }; 8819172284STrond Myklebust 891da177e4SLinus Torvalds struct gss_auth { 900285ed1fSTrond Myklebust struct kref kref; 91eb6dc19dSTrond Myklebust struct hlist_node hash; 921da177e4SLinus Torvalds struct rpc_auth rpc_auth; 931da177e4SLinus Torvalds struct gss_api_mech *mech; 941da177e4SLinus Torvalds enum rpc_gss_svc service; 951da177e4SLinus Torvalds struct rpc_clnt *client; 96e726340aSTrond Myklebust struct net *net; 9734769fc4S\"J. Bruce Fields\ /* 9834769fc4S\"J. Bruce Fields\ * There are two upcall pipes; dentry[1], named "gssd", is used 9934769fc4S\"J. Bruce Fields\ * for the new text-based upcall; dentry[0] is named after the 10034769fc4S\"J. Bruce Fields\ * mechanism (for example, "krb5") and exists for 10134769fc4S\"J. Bruce Fields\ * backwards-compatibility with older gssd's. 10234769fc4S\"J. Bruce Fields\ */ 10319172284STrond Myklebust struct gss_pipe *gss_pipe[2]; 104bd4a3eb1STrond Myklebust const char *target_name; 1051da177e4SLinus Torvalds }; 1061da177e4SLinus Torvalds 10779a3f20bS\"J. Bruce Fields\ /* pipe_version >= 0 if and only if someone has a pipe open. */ 10879a3f20bS\"J. Bruce Fields\ static DEFINE_SPINLOCK(pipe_version_lock); 10979a3f20bS\"J. Bruce Fields\ static struct rpc_wait_queue pipe_version_rpc_waitqueue; 11079a3f20bS\"J. Bruce Fields\ static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); 111cf81939dS\"J. Bruce Fields\ 1125d28dc82STrond Myklebust static void gss_free_ctx(struct gss_cl_ctx *); 113b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0; 114b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1; 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds static inline struct gss_cl_ctx * 1171da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 1181da177e4SLinus Torvalds { 1191da177e4SLinus Torvalds atomic_inc(&ctx->count); 1201da177e4SLinus Torvalds return ctx; 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds static inline void 1241da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1251da177e4SLinus Torvalds { 1261da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1275d28dc82STrond Myklebust gss_free_ctx(ctx); 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 1305d28dc82STrond Myklebust /* gss_cred_set_ctx: 1315d28dc82STrond Myklebust * called by gss_upcall_callback and gss_create_upcall in order 1325d28dc82STrond Myklebust * to set the gss context. The actual exchange of an old context 1339beae467SStanislav Kinsbursky * and a new one is protected by the pipe->lock. 1345d28dc82STrond Myklebust */ 1351da177e4SLinus Torvalds static void 1361da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1371da177e4SLinus Torvalds { 1381da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1395d28dc82STrond Myklebust 140cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 141cd019f75STrond Myklebust return; 1427b6962b0STrond Myklebust gss_get_ctx(ctx); 143cf778b00SEric Dumazet rcu_assign_pointer(gss_cred->gc_ctx, ctx); 144fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 145cd019f75STrond Myklebust smp_mb__before_clear_bit(); 146fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds static const void * 1501da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1511da177e4SLinus Torvalds { 1521da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1531da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1541da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1551da177e4SLinus Torvalds memcpy(res, p, len); 1561da177e4SLinus Torvalds return q; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds static inline const void * 1601da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds const void *q; 1631da177e4SLinus Torvalds unsigned int len; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1661da177e4SLinus Torvalds if (IS_ERR(p)) 1671da177e4SLinus Torvalds return p; 1681da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1691da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1701da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1710f38b873STrond Myklebust dest->data = kmemdup(p, len, GFP_NOFS); 1721da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1731da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1741da177e4SLinus Torvalds dest->len = len; 1751da177e4SLinus Torvalds return q; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds static struct gss_cl_ctx * 1791da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1801da177e4SLinus Torvalds { 1811da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1821da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1831da177e4SLinus Torvalds 1845d28dc82STrond Myklebust rcu_read_lock(); 1851da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1861da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1875d28dc82STrond Myklebust rcu_read_unlock(); 1881da177e4SLinus Torvalds return ctx; 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds static struct gss_cl_ctx * 1921da177e4SLinus Torvalds gss_alloc_context(void) 1931da177e4SLinus Torvalds { 1941da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1951da177e4SLinus Torvalds 1960f38b873STrond Myklebust ctx = kzalloc(sizeof(*ctx), GFP_NOFS); 1971da177e4SLinus Torvalds if (ctx != NULL) { 1981da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 1991da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 2001da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 2011da177e4SLinus Torvalds atomic_set(&ctx->count,1); 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds return ctx; 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 2071da177e4SLinus Torvalds static const void * 2081da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 2091da177e4SLinus Torvalds { 2101da177e4SLinus Torvalds const void *q; 2111da177e4SLinus Torvalds unsigned int seclen; 2121da177e4SLinus Torvalds unsigned int timeout; 213620038f6SAndy Adamson unsigned long now = jiffies; 2141da177e4SLinus Torvalds u32 window_size; 2151da177e4SLinus Torvalds int ret; 2161da177e4SLinus Torvalds 217620038f6SAndy Adamson /* First unsigned int gives the remaining lifetime in seconds of the 218620038f6SAndy Adamson * credential - e.g. the remaining TGT lifetime for Kerberos or 219620038f6SAndy Adamson * the -t value passed to GSSD. 220620038f6SAndy Adamson */ 2211da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2221da177e4SLinus Torvalds if (IS_ERR(p)) 2231da177e4SLinus Torvalds goto err; 2241da177e4SLinus Torvalds if (timeout == 0) 2251da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 226620038f6SAndy Adamson ctx->gc_expiry = now + ((unsigned long)timeout * HZ); 227620038f6SAndy Adamson /* Sequence number window. Determines the maximum number of 228620038f6SAndy Adamson * simultaneous requests 229620038f6SAndy Adamson */ 2301da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2311da177e4SLinus Torvalds if (IS_ERR(p)) 2321da177e4SLinus Torvalds goto err; 2331da177e4SLinus Torvalds ctx->gc_win = window_size; 2341da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2351da177e4SLinus Torvalds if (ctx->gc_win == 0) { 236dc5ddce9SJeff Layton /* 237dc5ddce9SJeff Layton * in which case, p points to an error code. Anything other 238dc5ddce9SJeff Layton * than -EKEYEXPIRED gets converted to -EACCES. 239dc5ddce9SJeff Layton */ 240dc5ddce9SJeff Layton p = simple_get_bytes(p, end, &ret, sizeof(ret)); 241dc5ddce9SJeff Layton if (!IS_ERR(p)) 242dc5ddce9SJeff Layton p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : 243dc5ddce9SJeff Layton ERR_PTR(-EACCES); 2441da177e4SLinus Torvalds goto err; 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds /* copy the opaque wire context */ 2471da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2481da177e4SLinus Torvalds if (IS_ERR(p)) 2491da177e4SLinus Torvalds goto err; 2501da177e4SLinus Torvalds /* import the opaque security context */ 2511da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2521da177e4SLinus Torvalds if (IS_ERR(p)) 2531da177e4SLinus Torvalds goto err; 2541da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2551da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2561da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2571da177e4SLinus Torvalds goto err; 2581da177e4SLinus Torvalds } 259400f26b5SSimo Sorce ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); 2601da177e4SLinus Torvalds if (ret < 0) { 2611da177e4SLinus Torvalds p = ERR_PTR(ret); 2621da177e4SLinus Torvalds goto err; 2631da177e4SLinus Torvalds } 264620038f6SAndy Adamson dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n", 265620038f6SAndy Adamson __func__, ctx->gc_expiry, now, timeout); 2661da177e4SLinus Torvalds return q; 2671da177e4SLinus Torvalds err: 268173db309SJeff Layton dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); 2691da177e4SLinus Torvalds return p; 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 27234769fc4S\"J. Bruce Fields\ #define UPCALL_BUF_LEN 128 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds struct gss_upcall_msg { 2751da177e4SLinus Torvalds atomic_t count; 2767eaf040bSEric W. Biederman kuid_t uid; 2771da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2781da177e4SLinus Torvalds struct list_head list; 2791da177e4SLinus Torvalds struct gss_auth *auth; 2809beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 2811da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2821da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2831da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 28434769fc4S\"J. Bruce Fields\ char databuf[UPCALL_BUF_LEN]; 2851da177e4SLinus Torvalds }; 2861da177e4SLinus Torvalds 2872aed8b47STrond Myklebust static int get_pipe_version(struct net *net) 28879a3f20bS\"J. Bruce Fields\ { 2892aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 29079a3f20bS\"J. Bruce Fields\ int ret; 29179a3f20bS\"J. Bruce Fields\ 29279a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 2932aed8b47STrond Myklebust if (sn->pipe_version >= 0) { 2942aed8b47STrond Myklebust atomic_inc(&sn->pipe_users); 2952aed8b47STrond Myklebust ret = sn->pipe_version; 29679a3f20bS\"J. Bruce Fields\ } else 29779a3f20bS\"J. Bruce Fields\ ret = -EAGAIN; 29879a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 29979a3f20bS\"J. Bruce Fields\ return ret; 30079a3f20bS\"J. Bruce Fields\ } 30179a3f20bS\"J. Bruce Fields\ 3022aed8b47STrond Myklebust static void put_pipe_version(struct net *net) 30379a3f20bS\"J. Bruce Fields\ { 3042aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 3052aed8b47STrond Myklebust 3062aed8b47STrond Myklebust if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { 3072aed8b47STrond Myklebust sn->pipe_version = -1; 30879a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 30979a3f20bS\"J. Bruce Fields\ } 31079a3f20bS\"J. Bruce Fields\ } 31179a3f20bS\"J. Bruce Fields\ 3121da177e4SLinus Torvalds static void 3131da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 3141da177e4SLinus Torvalds { 315e726340aSTrond Myklebust struct net *net = gss_msg->auth->net; 3161da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 3171da177e4SLinus Torvalds return; 3182aed8b47STrond Myklebust put_pipe_version(net); 3191da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 3201da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 3211da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 322f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 3231da177e4SLinus Torvalds kfree(gss_msg); 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds static struct gss_upcall_msg * 3277eaf040bSEric W. Biederman __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid) 3281da177e4SLinus Torvalds { 3291da177e4SLinus Torvalds struct gss_upcall_msg *pos; 3309beae467SStanislav Kinsbursky list_for_each_entry(pos, &pipe->in_downcall, list) { 3310b4d51b0SEric W. Biederman if (!uid_eq(pos->uid, uid)) 3321da177e4SLinus Torvalds continue; 3331da177e4SLinus Torvalds atomic_inc(&pos->count); 334632f0d05SChuck Lever dprintk("RPC: %s found msg %p\n", __func__, pos); 3351da177e4SLinus Torvalds return pos; 3361da177e4SLinus Torvalds } 337632f0d05SChuck Lever dprintk("RPC: %s found nothing\n", __func__); 3381da177e4SLinus Torvalds return NULL; 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds 341720b8f2dS\\\"J. Bruce Fields\\\ /* Try to add an upcall to the pipefs queue. 3421da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 3431da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 3441da177e4SLinus Torvalds */ 3451da177e4SLinus Torvalds static inline struct gss_upcall_msg * 346053e324fSSuresh Jayaraman gss_add_msg(struct gss_upcall_msg *gss_msg) 3471da177e4SLinus Torvalds { 3489beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3491da177e4SLinus Torvalds struct gss_upcall_msg *old; 3501da177e4SLinus Torvalds 3519beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3529beae467SStanislav Kinsbursky old = __gss_find_upcall(pipe, gss_msg->uid); 3531da177e4SLinus Torvalds if (old == NULL) { 3541da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3559beae467SStanislav Kinsbursky list_add(&gss_msg->list, &pipe->in_downcall); 3561da177e4SLinus Torvalds } else 3571da177e4SLinus Torvalds gss_msg = old; 3589beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3591da177e4SLinus Torvalds return gss_msg; 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds static void 3631da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3641da177e4SLinus Torvalds { 3651da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3661da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3671da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3681da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds static void 3721da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3731da177e4SLinus Torvalds { 3749beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3751da177e4SLinus Torvalds 3763b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3773b68aaeaSTrond Myklebust return; 3789beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3793b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3801da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 3819beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds static void 385126e216aSTrond Myklebust gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) 386126e216aSTrond Myklebust { 387126e216aSTrond Myklebust switch (gss_msg->msg.errno) { 388126e216aSTrond Myklebust case 0: 389126e216aSTrond Myklebust if (gss_msg->ctx == NULL) 390126e216aSTrond Myklebust break; 391126e216aSTrond Myklebust clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 392126e216aSTrond Myklebust gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); 393126e216aSTrond Myklebust break; 394126e216aSTrond Myklebust case -EKEYEXPIRED: 395126e216aSTrond Myklebust set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 396126e216aSTrond Myklebust } 397126e216aSTrond Myklebust gss_cred->gc_upcall_timestamp = jiffies; 398126e216aSTrond Myklebust gss_cred->gc_upcall = NULL; 399126e216aSTrond Myklebust rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 400126e216aSTrond Myklebust } 401126e216aSTrond Myklebust 402126e216aSTrond Myklebust static void 4031da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 4041da177e4SLinus Torvalds { 405a17c2153STrond Myklebust struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, 4061da177e4SLinus Torvalds struct gss_cred, gc_base); 4071da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 4089beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 4091da177e4SLinus Torvalds 4109beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 411126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 4129beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 413126e216aSTrond Myklebust task->tk_status = gss_msg->msg.errno; 4141da177e4SLinus Torvalds gss_release_msg(gss_msg); 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 41734769fc4S\"J. Bruce Fields\ static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) 41834769fc4S\"J. Bruce Fields\ { 41990602c7bSEric W. Biederman uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); 42090602c7bSEric W. Biederman memcpy(gss_msg->databuf, &uid, sizeof(uid)); 42190602c7bSEric W. Biederman gss_msg->msg.data = gss_msg->databuf; 42290602c7bSEric W. Biederman gss_msg->msg.len = sizeof(uid); 42390602c7bSEric W. Biederman BUG_ON(sizeof(uid) > UPCALL_BUF_LEN); 42434769fc4S\"J. Bruce Fields\ } 42534769fc4S\"J. Bruce Fields\ 4268b1c7bf5SOlga Kornievskaia static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, 427bd4a3eb1STrond Myklebust const char *service_name, 428bd4a3eb1STrond Myklebust const char *target_name) 42934769fc4S\"J. Bruce Fields\ { 430683ac665STrond Myklebust struct gss_api_mech *mech = gss_msg->auth->mech; 4318b1c7bf5SOlga Kornievskaia char *p = gss_msg->databuf; 4328b1c7bf5SOlga Kornievskaia int len = 0; 4338b1c7bf5SOlga Kornievskaia 4348b1c7bf5SOlga Kornievskaia gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", 435683ac665STrond Myklebust mech->gm_name, 43690602c7bSEric W. Biederman from_kuid(&init_user_ns, gss_msg->uid)); 4378b1c7bf5SOlga Kornievskaia p += gss_msg->msg.len; 438bd4a3eb1STrond Myklebust if (target_name) { 439bd4a3eb1STrond Myklebust len = sprintf(p, "target=%s ", target_name); 4408b1c7bf5SOlga Kornievskaia p += len; 4418b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4428b1c7bf5SOlga Kornievskaia } 44368c97153STrond Myklebust if (service_name != NULL) { 44468c97153STrond Myklebust len = sprintf(p, "service=%s ", service_name); 4452efef708SOlga Kornievskaia p += len; 4462efef708SOlga Kornievskaia gss_msg->msg.len += len; 4472efef708SOlga Kornievskaia } 448683ac665STrond Myklebust if (mech->gm_upcall_enctypes) { 449f8628220SKevin Coffman len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes); 450683ac665STrond Myklebust p += len; 451683ac665STrond Myklebust gss_msg->msg.len += len; 452683ac665STrond Myklebust } 4538b1c7bf5SOlga Kornievskaia len = sprintf(p, "\n"); 4548b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4558b1c7bf5SOlga Kornievskaia 45634769fc4S\"J. Bruce Fields\ gss_msg->msg.data = gss_msg->databuf; 45734769fc4S\"J. Bruce Fields\ BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); 45834769fc4S\"J. Bruce Fields\ } 45934769fc4S\"J. Bruce Fields\ 46068c97153STrond Myklebust static struct gss_upcall_msg * 461e726340aSTrond Myklebust gss_alloc_msg(struct gss_auth *gss_auth, 4627eaf040bSEric W. Biederman kuid_t uid, const char *service_name) 4631da177e4SLinus Torvalds { 4641da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 46579a3f20bS\"J. Bruce Fields\ int vers; 4661da177e4SLinus Torvalds 4670f38b873STrond Myklebust gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 468db75b3d6S\"J. Bruce Fields\ if (gss_msg == NULL) 469db75b3d6S\"J. Bruce Fields\ return ERR_PTR(-ENOMEM); 470e726340aSTrond Myklebust vers = get_pipe_version(gss_auth->net); 47179a3f20bS\"J. Bruce Fields\ if (vers < 0) { 47279a3f20bS\"J. Bruce Fields\ kfree(gss_msg); 47379a3f20bS\"J. Bruce Fields\ return ERR_PTR(vers); 47479a3f20bS\"J. Bruce Fields\ } 47519172284STrond Myklebust gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; 4761da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 4771da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 4781da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 4791da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 4801da177e4SLinus Torvalds gss_msg->uid = uid; 4811da177e4SLinus Torvalds gss_msg->auth = gss_auth; 482bd4a3eb1STrond Myklebust switch (vers) { 483bd4a3eb1STrond Myklebust case 0: 484bd4a3eb1STrond Myklebust gss_encode_v0_msg(gss_msg); 485bd4a3eb1STrond Myklebust default: 486bd4a3eb1STrond Myklebust gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name); 487bd4a3eb1STrond Myklebust }; 4881da177e4SLinus Torvalds return gss_msg; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds static struct gss_upcall_msg * 492e726340aSTrond Myklebust gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) 4931da177e4SLinus Torvalds { 4947c67db3aSTrond Myklebust struct gss_cred *gss_cred = container_of(cred, 4957c67db3aSTrond Myklebust struct gss_cred, gc_base); 4961da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 4977eaf040bSEric W. Biederman kuid_t uid = cred->cr_uid; 4981da177e4SLinus Torvalds 499e726340aSTrond Myklebust gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); 500db75b3d6S\"J. Bruce Fields\ if (IS_ERR(gss_new)) 501db75b3d6S\"J. Bruce Fields\ return gss_new; 502053e324fSSuresh Jayaraman gss_msg = gss_add_msg(gss_new); 5031da177e4SLinus Torvalds if (gss_msg == gss_new) { 5049beae467SStanislav Kinsbursky int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); 5051da177e4SLinus Torvalds if (res) { 5061da177e4SLinus Torvalds gss_unhash_msg(gss_new); 5071da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds } else 5101da177e4SLinus Torvalds gss_release_msg(gss_new); 5111da177e4SLinus Torvalds return gss_msg; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 514b03568c3S\"J. Bruce Fields\ static void warn_gssd(void) 515b03568c3S\"J. Bruce Fields\ { 516b03568c3S\"J. Bruce Fields\ static unsigned long ratelimit; 517b03568c3S\"J. Bruce Fields\ unsigned long now = jiffies; 518b03568c3S\"J. Bruce Fields\ 519b03568c3S\"J. Bruce Fields\ if (time_after(now, ratelimit)) { 520b03568c3S\"J. Bruce Fields\ printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 521b03568c3S\"J. Bruce Fields\ "Please check user daemon is running.\n"); 522b03568c3S\"J. Bruce Fields\ ratelimit = now + 15*HZ; 523b03568c3S\"J. Bruce Fields\ } 524b03568c3S\"J. Bruce Fields\ } 525b03568c3S\"J. Bruce Fields\ 5261da177e4SLinus Torvalds static inline int 5271da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 5281da177e4SLinus Torvalds { 529a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 5304a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 5311da177e4SLinus Torvalds struct gss_auth, rpc_auth); 5321da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 5331da177e4SLinus Torvalds struct gss_cred, gc_base); 5341da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5359beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 5361da177e4SLinus Torvalds int err = 0; 5371da177e4SLinus Torvalds 538632f0d05SChuck Lever dprintk("RPC: %5u %s for uid %u\n", 539cdba321eSEric W. Biederman task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); 540e726340aSTrond Myklebust gss_msg = gss_setup_upcall(gss_auth, cred); 541480e3243SRoel Kluin if (PTR_ERR(gss_msg) == -EAGAIN) { 54279a3f20bS\"J. Bruce Fields\ /* XXX: warning on the first, under the assumption we 54379a3f20bS\"J. Bruce Fields\ * shouldn't normally hit this case on a refresh. */ 54479a3f20bS\"J. Bruce Fields\ warn_gssd(); 54579a3f20bS\"J. Bruce Fields\ task->tk_timeout = 15*HZ; 54679a3f20bS\"J. Bruce Fields\ rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); 547d1a8016aSBryan Schumaker return -EAGAIN; 54879a3f20bS\"J. Bruce Fields\ } 5491da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 5501da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 5511da177e4SLinus Torvalds goto out; 5521da177e4SLinus Torvalds } 5539beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 5549beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 5551da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 5565d00837bSTrond Myklebust rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 557126e216aSTrond Myklebust else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 5581da177e4SLinus Torvalds task->tk_timeout = 0; 5591da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 5601da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 5611da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5625d00837bSTrond Myklebust rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 563126e216aSTrond Myklebust } else { 564126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 5651da177e4SLinus Torvalds err = gss_msg->msg.errno; 566126e216aSTrond Myklebust } 5679beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 5681da177e4SLinus Torvalds gss_release_msg(gss_msg); 5691da177e4SLinus Torvalds out: 570632f0d05SChuck Lever dprintk("RPC: %5u %s for uid %u result %d\n", 571cdba321eSEric W. Biederman task->tk_pid, __func__, 572cdba321eSEric W. Biederman from_kuid(&init_user_ns, cred->cr_uid), err); 5731da177e4SLinus Torvalds return err; 5741da177e4SLinus Torvalds } 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds static inline int 5771da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 5781da177e4SLinus Torvalds { 579e726340aSTrond Myklebust struct net *net = gss_auth->net; 580abfdbd53STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 5819beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 5821da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 5831da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 584abfdbd53STrond Myklebust unsigned long timeout; 5851da177e4SLinus Torvalds DEFINE_WAIT(wait); 586d36ccb9cSTrond Myklebust int err; 5871da177e4SLinus Torvalds 588cdba321eSEric W. Biederman dprintk("RPC: %s for uid %u\n", 589cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, cred->cr_uid)); 59079a3f20bS\"J. Bruce Fields\ retry: 591d36ccb9cSTrond Myklebust err = 0; 592abfdbd53STrond Myklebust /* Default timeout is 15s unless we know that gssd is not running */ 593abfdbd53STrond Myklebust timeout = 15 * HZ; 594abfdbd53STrond Myklebust if (!sn->gssd_running) 595abfdbd53STrond Myklebust timeout = HZ >> 2; 596e726340aSTrond Myklebust gss_msg = gss_setup_upcall(gss_auth, cred); 59779a3f20bS\"J. Bruce Fields\ if (PTR_ERR(gss_msg) == -EAGAIN) { 59879a3f20bS\"J. Bruce Fields\ err = wait_event_interruptible_timeout(pipe_version_waitqueue, 5992aed8b47STrond Myklebust sn->pipe_version >= 0, timeout); 6002aed8b47STrond Myklebust if (sn->pipe_version < 0) { 601abfdbd53STrond Myklebust if (err == 0) 602abfdbd53STrond Myklebust sn->gssd_running = 0; 603d1a8016aSBryan Schumaker warn_gssd(); 604d1a8016aSBryan Schumaker err = -EACCES; 605d1a8016aSBryan Schumaker } 606d36ccb9cSTrond Myklebust if (err < 0) 60779a3f20bS\"J. Bruce Fields\ goto out; 60879a3f20bS\"J. Bruce Fields\ goto retry; 60979a3f20bS\"J. Bruce Fields\ } 6101da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 6111da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 6121da177e4SLinus Torvalds goto out; 6131da177e4SLinus Torvalds } 6149beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 6151da177e4SLinus Torvalds for (;;) { 6165afa9133STrond Myklebust prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); 6179beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 6181da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 6191da177e4SLinus Torvalds break; 6201da177e4SLinus Torvalds } 6219beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6225afa9133STrond Myklebust if (fatal_signal_pending(current)) { 6231da177e4SLinus Torvalds err = -ERESTARTSYS; 6241da177e4SLinus Torvalds goto out_intr; 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds schedule(); 6271da177e4SLinus Torvalds } 6281da177e4SLinus Torvalds if (gss_msg->ctx) 6297b6962b0STrond Myklebust gss_cred_set_ctx(cred, gss_msg->ctx); 6301da177e4SLinus Torvalds else 6311da177e4SLinus Torvalds err = gss_msg->msg.errno; 6329beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6331da177e4SLinus Torvalds out_intr: 6341da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 6351da177e4SLinus Torvalds gss_release_msg(gss_msg); 6361da177e4SLinus Torvalds out: 637632f0d05SChuck Lever dprintk("RPC: %s for uid %u result %d\n", 638cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, cred->cr_uid), err); 6391da177e4SLinus Torvalds return err; 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds static ssize_t 6451da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 6461da177e4SLinus Torvalds { 6471da177e4SLinus Torvalds const void *p, *end; 6481da177e4SLinus Torvalds void *buf; 6491da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 650496ad9aaSAl Viro struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; 6511da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 65290602c7bSEric W. Biederman uid_t id; 65390602c7bSEric W. Biederman kuid_t uid; 6543b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 6571da177e4SLinus Torvalds goto out; 6581da177e4SLinus Torvalds err = -ENOMEM; 6590f38b873STrond Myklebust buf = kmalloc(mlen, GFP_NOFS); 6601da177e4SLinus Torvalds if (!buf) 6611da177e4SLinus Torvalds goto out; 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds err = -EFAULT; 6641da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 6651da177e4SLinus Torvalds goto err; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 66890602c7bSEric W. Biederman p = simple_get_bytes(buf, end, &id, sizeof(id)); 6691da177e4SLinus Torvalds if (IS_ERR(p)) { 6701da177e4SLinus Torvalds err = PTR_ERR(p); 6711da177e4SLinus Torvalds goto err; 6721da177e4SLinus Torvalds } 6731da177e4SLinus Torvalds 67490602c7bSEric W. Biederman uid = make_kuid(&init_user_ns, id); 67590602c7bSEric W. Biederman if (!uid_valid(uid)) { 67690602c7bSEric W. Biederman err = -EINVAL; 67790602c7bSEric W. Biederman goto err; 67890602c7bSEric W. Biederman } 67990602c7bSEric W. Biederman 6801da177e4SLinus Torvalds err = -ENOMEM; 6811da177e4SLinus Torvalds ctx = gss_alloc_context(); 6821da177e4SLinus Torvalds if (ctx == NULL) 6831da177e4SLinus Torvalds goto err; 6843b68aaeaSTrond Myklebust 6853b68aaeaSTrond Myklebust err = -ENOENT; 6863b68aaeaSTrond Myklebust /* Find a matching upcall */ 6879beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 6889beae467SStanislav Kinsbursky gss_msg = __gss_find_upcall(pipe, uid); 6893b68aaeaSTrond Myklebust if (gss_msg == NULL) { 6909beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6913b68aaeaSTrond Myklebust goto err_put_ctx; 6923b68aaeaSTrond Myklebust } 6933b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 6949beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6953b68aaeaSTrond Myklebust 6966e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 6971da177e4SLinus Torvalds if (IS_ERR(p)) { 6981da177e4SLinus Torvalds err = PTR_ERR(p); 699486bad2eSJeff Layton switch (err) { 700486bad2eSJeff Layton case -EACCES: 701dc5ddce9SJeff Layton case -EKEYEXPIRED: 702486bad2eSJeff Layton gss_msg->msg.errno = err; 703486bad2eSJeff Layton err = mlen; 704486bad2eSJeff Layton break; 705486bad2eSJeff Layton case -EFAULT: 706486bad2eSJeff Layton case -ENOMEM: 707486bad2eSJeff Layton case -EINVAL: 708486bad2eSJeff Layton case -ENOSYS: 709486bad2eSJeff Layton gss_msg->msg.errno = -EAGAIN; 710486bad2eSJeff Layton break; 711486bad2eSJeff Layton default: 712486bad2eSJeff Layton printk(KERN_CRIT "%s: bad return from " 7136c853099SRandy Dunlap "gss_fill_context: %zd\n", __func__, err); 714486bad2eSJeff Layton BUG(); 715486bad2eSJeff Layton } 7163b68aaeaSTrond Myklebust goto err_release_msg; 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 7193b68aaeaSTrond Myklebust err = mlen; 7203b68aaeaSTrond Myklebust 7213b68aaeaSTrond Myklebust err_release_msg: 7229beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7231da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 7249beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7251da177e4SLinus Torvalds gss_release_msg(gss_msg); 7261da177e4SLinus Torvalds err_put_ctx: 7271da177e4SLinus Torvalds gss_put_ctx(ctx); 7281da177e4SLinus Torvalds err: 7291da177e4SLinus Torvalds kfree(buf); 7301da177e4SLinus Torvalds out: 731632f0d05SChuck Lever dprintk("RPC: %s returning %Zd\n", __func__, err); 7321da177e4SLinus Torvalds return err; 7331da177e4SLinus Torvalds } 7341da177e4SLinus Torvalds 73534769fc4S\"J. Bruce Fields\ static int gss_pipe_open(struct inode *inode, int new_version) 736cf81939dS\"J. Bruce Fields\ { 7372aed8b47STrond Myklebust struct net *net = inode->i_sb->s_fs_info; 7382aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 73934769fc4S\"J. Bruce Fields\ int ret = 0; 74034769fc4S\"J. Bruce Fields\ 74179a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 7422aed8b47STrond Myklebust if (sn->pipe_version < 0) { 74334769fc4S\"J. Bruce Fields\ /* First open of any gss pipe determines the version: */ 7442aed8b47STrond Myklebust sn->pipe_version = new_version; 74579a3f20bS\"J. Bruce Fields\ rpc_wake_up(&pipe_version_rpc_waitqueue); 74679a3f20bS\"J. Bruce Fields\ wake_up(&pipe_version_waitqueue); 7472aed8b47STrond Myklebust } else if (sn->pipe_version != new_version) { 74834769fc4S\"J. Bruce Fields\ /* Trying to open a pipe of a different version */ 74934769fc4S\"J. Bruce Fields\ ret = -EBUSY; 75034769fc4S\"J. Bruce Fields\ goto out; 75179a3f20bS\"J. Bruce Fields\ } 7522aed8b47STrond Myklebust atomic_inc(&sn->pipe_users); 75334769fc4S\"J. Bruce Fields\ out: 75479a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 75534769fc4S\"J. Bruce Fields\ return ret; 75634769fc4S\"J. Bruce Fields\ 75734769fc4S\"J. Bruce Fields\ } 75834769fc4S\"J. Bruce Fields\ 75934769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v0(struct inode *inode) 76034769fc4S\"J. Bruce Fields\ { 76134769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 0); 76234769fc4S\"J. Bruce Fields\ } 76334769fc4S\"J. Bruce Fields\ 76434769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v1(struct inode *inode) 76534769fc4S\"J. Bruce Fields\ { 76634769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 1); 767cf81939dS\"J. Bruce Fields\ } 768cf81939dS\"J. Bruce Fields\ 7691da177e4SLinus Torvalds static void 7701da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 7711da177e4SLinus Torvalds { 7722aed8b47STrond Myklebust struct net *net = inode->i_sb->s_fs_info; 7739beae467SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 7741da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 7751da177e4SLinus Torvalds 7765a67657aSTrond Myklebust restart: 7779beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7789beae467SStanislav Kinsbursky list_for_each_entry(gss_msg, &pipe->in_downcall, list) { 7796e84c7b6STrond Myklebust 7805a67657aSTrond Myklebust if (!list_empty(&gss_msg->msg.list)) 7815a67657aSTrond Myklebust continue; 7821da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 7831da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 7841da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 7859beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7861da177e4SLinus Torvalds gss_release_msg(gss_msg); 7875a67657aSTrond Myklebust goto restart; 7881da177e4SLinus Torvalds } 7899beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 790cf81939dS\"J. Bruce Fields\ 7912aed8b47STrond Myklebust put_pipe_version(net); 7921da177e4SLinus Torvalds } 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds static void 7951da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 7961da177e4SLinus Torvalds { 7971da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds if (msg->errno < 0) { 800632f0d05SChuck Lever dprintk("RPC: %s releasing msg %p\n", 801632f0d05SChuck Lever __func__, gss_msg); 8021da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 8031da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 804b03568c3S\"J. Bruce Fields\ if (msg->errno == -ETIMEDOUT) 805b03568c3S\"J. Bruce Fields\ warn_gssd(); 8061da177e4SLinus Torvalds gss_release_msg(gss_msg); 8071da177e4SLinus Torvalds } 8081da177e4SLinus Torvalds } 8091da177e4SLinus Torvalds 81019172284STrond Myklebust static void gss_pipe_dentry_destroy(struct dentry *dir, 81119172284STrond Myklebust struct rpc_pipe_dir_object *pdo) 812ccdc28f8SStanislav Kinsbursky { 81319172284STrond Myklebust struct gss_pipe *gss_pipe = pdo->pdo_data; 81419172284STrond Myklebust struct rpc_pipe *pipe = gss_pipe->pipe; 815ccdc28f8SStanislav Kinsbursky 81619172284STrond Myklebust if (pipe->dentry != NULL) { 81719172284STrond Myklebust rpc_unlink(pipe->dentry); 81819172284STrond Myklebust pipe->dentry = NULL; 8196b2fddd3STrond Myklebust } 820ccdc28f8SStanislav Kinsbursky } 821ccdc28f8SStanislav Kinsbursky 82219172284STrond Myklebust static int gss_pipe_dentry_create(struct dentry *dir, 82319172284STrond Myklebust struct rpc_pipe_dir_object *pdo) 824ccdc28f8SStanislav Kinsbursky { 82519172284STrond Myklebust struct gss_pipe *p = pdo->pdo_data; 8266b2fddd3STrond Myklebust struct dentry *dentry; 827ccdc28f8SStanislav Kinsbursky 82819172284STrond Myklebust dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); 82919172284STrond Myklebust if (IS_ERR(dentry)) 83019172284STrond Myklebust return PTR_ERR(dentry); 83119172284STrond Myklebust p->pipe->dentry = dentry; 832ccdc28f8SStanislav Kinsbursky return 0; 83319172284STrond Myklebust } 834ccdc28f8SStanislav Kinsbursky 83519172284STrond Myklebust static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { 83619172284STrond Myklebust .create = gss_pipe_dentry_create, 83719172284STrond Myklebust .destroy = gss_pipe_dentry_destroy, 83819172284STrond Myklebust }; 83919172284STrond Myklebust 84019172284STrond Myklebust static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, 84119172284STrond Myklebust const char *name, 84219172284STrond Myklebust const struct rpc_pipe_ops *upcall_ops) 84319172284STrond Myklebust { 84419172284STrond Myklebust struct gss_pipe *p; 84519172284STrond Myklebust int err = -ENOMEM; 84619172284STrond Myklebust 84719172284STrond Myklebust p = kmalloc(sizeof(*p), GFP_KERNEL); 84819172284STrond Myklebust if (p == NULL) 84919172284STrond Myklebust goto err; 85019172284STrond Myklebust p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 85119172284STrond Myklebust if (IS_ERR(p->pipe)) { 85219172284STrond Myklebust err = PTR_ERR(p->pipe); 85319172284STrond Myklebust goto err_free_gss_pipe; 85419172284STrond Myklebust } 85519172284STrond Myklebust p->name = name; 85619172284STrond Myklebust p->clnt = clnt; 857414a6295STrond Myklebust kref_init(&p->kref); 85819172284STrond Myklebust rpc_init_pipe_dir_object(&p->pdo, 85919172284STrond Myklebust &gss_pipe_dir_object_ops, 86019172284STrond Myklebust p); 86119172284STrond Myklebust return p; 86219172284STrond Myklebust err_free_gss_pipe: 86319172284STrond Myklebust kfree(p); 8646b2fddd3STrond Myklebust err: 86519172284STrond Myklebust return ERR_PTR(err); 866ccdc28f8SStanislav Kinsbursky } 867ccdc28f8SStanislav Kinsbursky 868414a6295STrond Myklebust struct gss_alloc_pdo { 869414a6295STrond Myklebust struct rpc_clnt *clnt; 870414a6295STrond Myklebust const char *name; 871414a6295STrond Myklebust const struct rpc_pipe_ops *upcall_ops; 872414a6295STrond Myklebust }; 873414a6295STrond Myklebust 874414a6295STrond Myklebust static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) 875414a6295STrond Myklebust { 876414a6295STrond Myklebust struct gss_pipe *gss_pipe; 877414a6295STrond Myklebust struct gss_alloc_pdo *args = data; 878414a6295STrond Myklebust 879414a6295STrond Myklebust if (pdo->pdo_ops != &gss_pipe_dir_object_ops) 880414a6295STrond Myklebust return 0; 881414a6295STrond Myklebust gss_pipe = container_of(pdo, struct gss_pipe, pdo); 882414a6295STrond Myklebust if (strcmp(gss_pipe->name, args->name) != 0) 883414a6295STrond Myklebust return 0; 884414a6295STrond Myklebust if (!kref_get_unless_zero(&gss_pipe->kref)) 885414a6295STrond Myklebust return 0; 886414a6295STrond Myklebust return 1; 887414a6295STrond Myklebust } 888414a6295STrond Myklebust 889414a6295STrond Myklebust static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) 890414a6295STrond Myklebust { 891414a6295STrond Myklebust struct gss_pipe *gss_pipe; 892414a6295STrond Myklebust struct gss_alloc_pdo *args = data; 893414a6295STrond Myklebust 894414a6295STrond Myklebust gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); 895414a6295STrond Myklebust if (!IS_ERR(gss_pipe)) 896414a6295STrond Myklebust return &gss_pipe->pdo; 897414a6295STrond Myklebust return NULL; 898414a6295STrond Myklebust } 899414a6295STrond Myklebust 900414a6295STrond Myklebust static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, 901414a6295STrond Myklebust const char *name, 902414a6295STrond Myklebust const struct rpc_pipe_ops *upcall_ops) 903414a6295STrond Myklebust { 904414a6295STrond Myklebust struct net *net = rpc_net_ns(clnt); 905414a6295STrond Myklebust struct rpc_pipe_dir_object *pdo; 906414a6295STrond Myklebust struct gss_alloc_pdo args = { 907414a6295STrond Myklebust .clnt = clnt, 908414a6295STrond Myklebust .name = name, 909414a6295STrond Myklebust .upcall_ops = upcall_ops, 910414a6295STrond Myklebust }; 911414a6295STrond Myklebust 912414a6295STrond Myklebust pdo = rpc_find_or_alloc_pipe_dir_object(net, 913414a6295STrond Myklebust &clnt->cl_pipedir_objects, 914414a6295STrond Myklebust gss_pipe_match_pdo, 915414a6295STrond Myklebust gss_pipe_alloc_pdo, 916414a6295STrond Myklebust &args); 917414a6295STrond Myklebust if (pdo != NULL) 918414a6295STrond Myklebust return container_of(pdo, struct gss_pipe, pdo); 919414a6295STrond Myklebust return ERR_PTR(-ENOMEM); 920414a6295STrond Myklebust } 921414a6295STrond Myklebust 92219172284STrond Myklebust static void __gss_pipe_free(struct gss_pipe *p) 923ccdc28f8SStanislav Kinsbursky { 92419172284STrond Myklebust struct rpc_clnt *clnt = p->clnt; 92519172284STrond Myklebust struct net *net = rpc_net_ns(clnt); 926ccdc28f8SStanislav Kinsbursky 92719172284STrond Myklebust rpc_remove_pipe_dir_object(net, 92819172284STrond Myklebust &clnt->cl_pipedir_objects, 92919172284STrond Myklebust &p->pdo); 93019172284STrond Myklebust rpc_destroy_pipe_data(p->pipe); 93119172284STrond Myklebust kfree(p); 932ccdc28f8SStanislav Kinsbursky } 933ccdc28f8SStanislav Kinsbursky 934414a6295STrond Myklebust static void __gss_pipe_release(struct kref *kref) 935414a6295STrond Myklebust { 936414a6295STrond Myklebust struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); 937414a6295STrond Myklebust 938414a6295STrond Myklebust __gss_pipe_free(p); 939414a6295STrond Myklebust } 940414a6295STrond Myklebust 94119172284STrond Myklebust static void gss_pipe_free(struct gss_pipe *p) 942ccdc28f8SStanislav Kinsbursky { 94319172284STrond Myklebust if (p != NULL) 944414a6295STrond Myklebust kref_put(&p->kref, __gss_pipe_release); 945ccdc28f8SStanislav Kinsbursky } 946ccdc28f8SStanislav Kinsbursky 9471da177e4SLinus Torvalds /* 9481da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 9491da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 9501da177e4SLinus Torvalds */ 951eb6dc19dSTrond Myklebust static struct gss_auth * 952eb6dc19dSTrond Myklebust gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 9531da177e4SLinus Torvalds { 954c2190661STrond Myklebust rpc_authflavor_t flavor = args->pseudoflavor; 9551da177e4SLinus Torvalds struct gss_auth *gss_auth; 95619172284STrond Myklebust struct gss_pipe *gss_pipe; 9571da177e4SLinus Torvalds struct rpc_auth * auth; 9586a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 9611da177e4SLinus Torvalds 9621da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 9636a19275aSJ. Bruce Fields return ERR_PTR(err); 9641da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 9651da177e4SLinus Torvalds goto out_dec; 966eb6dc19dSTrond Myklebust INIT_HLIST_NODE(&gss_auth->hash); 967bd4a3eb1STrond Myklebust gss_auth->target_name = NULL; 968c2190661STrond Myklebust if (args->target_name) { 969c2190661STrond Myklebust gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); 970bd4a3eb1STrond Myklebust if (gss_auth->target_name == NULL) 971bd4a3eb1STrond Myklebust goto err_free; 972bd4a3eb1STrond Myklebust } 9731da177e4SLinus Torvalds gss_auth->client = clnt; 974e726340aSTrond Myklebust gss_auth->net = get_net(rpc_net_ns(clnt)); 9756a19275aSJ. Bruce Fields err = -EINVAL; 9761da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 9771da177e4SLinus Torvalds if (!gss_auth->mech) { 9789b1d75b7STrond Myklebust dprintk("RPC: Pseudoflavor %d not found!\n", flavor); 979e726340aSTrond Myklebust goto err_put_net; 9801da177e4SLinus Torvalds } 9811da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 982438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 983438b6fdeSJ. Bruce Fields goto err_put_mech; 9841da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 9851da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 9861da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 9871da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 9881da177e4SLinus Torvalds auth->au_flavor = flavor; 9891da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 9900285ed1fSTrond Myklebust kref_init(&gss_auth->kref); 9911da177e4SLinus Torvalds 99219172284STrond Myklebust err = rpcauth_init_credcache(auth); 99319172284STrond Myklebust if (err) 99419172284STrond Myklebust goto err_put_mech; 99534769fc4S\"J. Bruce Fields\ /* 99634769fc4S\"J. Bruce Fields\ * Note: if we created the old pipe first, then someone who 99734769fc4S\"J. Bruce Fields\ * examined the directory at the right moment might conclude 99834769fc4S\"J. Bruce Fields\ * that we supported only the old pipe. So we instead create 99934769fc4S\"J. Bruce Fields\ * the new pipe first. 100034769fc4S\"J. Bruce Fields\ */ 1001414a6295STrond Myklebust gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); 100219172284STrond Myklebust if (IS_ERR(gss_pipe)) { 100319172284STrond Myklebust err = PTR_ERR(gss_pipe); 100419172284STrond Myklebust goto err_destroy_credcache; 10056a19275aSJ. Bruce Fields } 100619172284STrond Myklebust gss_auth->gss_pipe[1] = gss_pipe; 10071da177e4SLinus Torvalds 1008414a6295STrond Myklebust gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, 100919172284STrond Myklebust &gss_upcall_ops_v0); 101019172284STrond Myklebust if (IS_ERR(gss_pipe)) { 101119172284STrond Myklebust err = PTR_ERR(gss_pipe); 1012c239d83bSStanislav Kinsbursky goto err_destroy_pipe_1; 1013c239d83bSStanislav Kinsbursky } 101419172284STrond Myklebust gss_auth->gss_pipe[0] = gss_pipe; 101507a2bf1dSTrond Myklebust 1016eb6dc19dSTrond Myklebust return gss_auth; 1017c239d83bSStanislav Kinsbursky err_destroy_pipe_1: 1018414a6295STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 101919172284STrond Myklebust err_destroy_credcache: 102019172284STrond Myklebust rpcauth_destroy_credcache(auth); 10211da177e4SLinus Torvalds err_put_mech: 10221da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 1023e726340aSTrond Myklebust err_put_net: 1024e726340aSTrond Myklebust put_net(gss_auth->net); 10251da177e4SLinus Torvalds err_free: 1026bd4a3eb1STrond Myklebust kfree(gss_auth->target_name); 10271da177e4SLinus Torvalds kfree(gss_auth); 10281da177e4SLinus Torvalds out_dec: 10291da177e4SLinus Torvalds module_put(THIS_MODULE); 10306a19275aSJ. Bruce Fields return ERR_PTR(err); 10311da177e4SLinus Torvalds } 10321da177e4SLinus Torvalds 10331da177e4SLinus Torvalds static void 10340285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 10350285ed1fSTrond Myklebust { 103619172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[0]); 103719172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 10380285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 1039e726340aSTrond Myklebust put_net(gss_auth->net); 1040bd4a3eb1STrond Myklebust kfree(gss_auth->target_name); 10410285ed1fSTrond Myklebust 10420285ed1fSTrond Myklebust kfree(gss_auth); 10430285ed1fSTrond Myklebust module_put(THIS_MODULE); 10440285ed1fSTrond Myklebust } 10450285ed1fSTrond Myklebust 10460285ed1fSTrond Myklebust static void 10470285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 10480285ed1fSTrond Myklebust { 10490285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 10500285ed1fSTrond Myklebust 10510285ed1fSTrond Myklebust gss_free(gss_auth); 10520285ed1fSTrond Myklebust } 10530285ed1fSTrond Myklebust 10540285ed1fSTrond Myklebust static void 10551da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 10561da177e4SLinus Torvalds { 105719172284STrond Myklebust struct gss_auth *gss_auth = container_of(auth, 105819172284STrond Myklebust struct gss_auth, rpc_auth); 10591da177e4SLinus Torvalds 10601da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 10611da177e4SLinus Torvalds auth, auth->au_flavor); 10621da177e4SLinus Torvalds 1063eb6dc19dSTrond Myklebust if (hash_hashed(&gss_auth->hash)) { 1064eb6dc19dSTrond Myklebust spin_lock(&gss_auth_hash_lock); 1065eb6dc19dSTrond Myklebust hash_del(&gss_auth->hash); 1066eb6dc19dSTrond Myklebust spin_unlock(&gss_auth_hash_lock); 1067eb6dc19dSTrond Myklebust } 1068eb6dc19dSTrond Myklebust 106919172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[0]); 107019172284STrond Myklebust gss_auth->gss_pipe[0] = NULL; 107119172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 107219172284STrond Myklebust gss_auth->gss_pipe[1] = NULL; 10733ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 10743ab9bb72STrond Myklebust 10750285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 10761da177e4SLinus Torvalds } 10771da177e4SLinus Torvalds 1078a0f6ed8eSJ. Bruce Fields /* 1079a0f6ed8eSJ. Bruce Fields * Auths may be shared between rpc clients that were cloned from a 1080a0f6ed8eSJ. Bruce Fields * common client with the same xprt, if they also share the flavor and 1081a0f6ed8eSJ. Bruce Fields * target_name. 1082a0f6ed8eSJ. Bruce Fields * 1083a0f6ed8eSJ. Bruce Fields * The auth is looked up from the oldest parent sharing the same 1084a0f6ed8eSJ. Bruce Fields * cl_xprt, and the auth itself references only that common parent 1085a0f6ed8eSJ. Bruce Fields * (which is guaranteed to last as long as any of its descendants). 1086a0f6ed8eSJ. Bruce Fields */ 1087eb6dc19dSTrond Myklebust static struct gss_auth * 1088eb6dc19dSTrond Myklebust gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args, 1089eb6dc19dSTrond Myklebust struct rpc_clnt *clnt, 1090eb6dc19dSTrond Myklebust struct gss_auth *new) 1091eb6dc19dSTrond Myklebust { 1092eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1093eb6dc19dSTrond Myklebust unsigned long hashval = (unsigned long)clnt; 1094eb6dc19dSTrond Myklebust 1095eb6dc19dSTrond Myklebust spin_lock(&gss_auth_hash_lock); 1096eb6dc19dSTrond Myklebust hash_for_each_possible(gss_auth_hash_table, 1097eb6dc19dSTrond Myklebust gss_auth, 1098eb6dc19dSTrond Myklebust hash, 1099eb6dc19dSTrond Myklebust hashval) { 1100a0f6ed8eSJ. Bruce Fields if (gss_auth->client != clnt) 1101a0f6ed8eSJ. Bruce Fields continue; 1102eb6dc19dSTrond Myklebust if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) 1103eb6dc19dSTrond Myklebust continue; 1104eb6dc19dSTrond Myklebust if (gss_auth->target_name != args->target_name) { 1105eb6dc19dSTrond Myklebust if (gss_auth->target_name == NULL) 1106eb6dc19dSTrond Myklebust continue; 1107eb6dc19dSTrond Myklebust if (args->target_name == NULL) 1108eb6dc19dSTrond Myklebust continue; 1109eb6dc19dSTrond Myklebust if (strcmp(gss_auth->target_name, args->target_name)) 1110eb6dc19dSTrond Myklebust continue; 1111eb6dc19dSTrond Myklebust } 1112eb6dc19dSTrond Myklebust if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count)) 1113eb6dc19dSTrond Myklebust continue; 1114eb6dc19dSTrond Myklebust goto out; 1115eb6dc19dSTrond Myklebust } 1116eb6dc19dSTrond Myklebust if (new) 1117eb6dc19dSTrond Myklebust hash_add(gss_auth_hash_table, &new->hash, hashval); 1118eb6dc19dSTrond Myklebust gss_auth = new; 1119eb6dc19dSTrond Myklebust out: 1120eb6dc19dSTrond Myklebust spin_unlock(&gss_auth_hash_lock); 1121eb6dc19dSTrond Myklebust return gss_auth; 1122eb6dc19dSTrond Myklebust } 1123eb6dc19dSTrond Myklebust 1124eb6dc19dSTrond Myklebust static struct gss_auth * 1125eb6dc19dSTrond Myklebust gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 1126eb6dc19dSTrond Myklebust { 1127eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1128eb6dc19dSTrond Myklebust struct gss_auth *new; 1129eb6dc19dSTrond Myklebust 1130eb6dc19dSTrond Myklebust gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); 1131eb6dc19dSTrond Myklebust if (gss_auth != NULL) 1132eb6dc19dSTrond Myklebust goto out; 1133eb6dc19dSTrond Myklebust new = gss_create_new(args, clnt); 1134eb6dc19dSTrond Myklebust if (IS_ERR(new)) 1135eb6dc19dSTrond Myklebust return new; 1136eb6dc19dSTrond Myklebust gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); 1137eb6dc19dSTrond Myklebust if (gss_auth != new) 1138eb6dc19dSTrond Myklebust gss_destroy(&new->rpc_auth); 1139eb6dc19dSTrond Myklebust out: 1140eb6dc19dSTrond Myklebust return gss_auth; 1141eb6dc19dSTrond Myklebust } 1142eb6dc19dSTrond Myklebust 1143eb6dc19dSTrond Myklebust static struct rpc_auth * 1144eb6dc19dSTrond Myklebust gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 1145eb6dc19dSTrond Myklebust { 1146eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1147eb6dc19dSTrond Myklebust struct rpc_xprt *xprt = rcu_access_pointer(clnt->cl_xprt); 1148eb6dc19dSTrond Myklebust 1149eb6dc19dSTrond Myklebust while (clnt != clnt->cl_parent) { 1150eb6dc19dSTrond Myklebust struct rpc_clnt *parent = clnt->cl_parent; 1151eb6dc19dSTrond Myklebust /* Find the original parent for this transport */ 1152eb6dc19dSTrond Myklebust if (rcu_access_pointer(parent->cl_xprt) != xprt) 1153eb6dc19dSTrond Myklebust break; 1154eb6dc19dSTrond Myklebust clnt = parent; 1155eb6dc19dSTrond Myklebust } 1156eb6dc19dSTrond Myklebust 1157eb6dc19dSTrond Myklebust gss_auth = gss_create_hashed(args, clnt); 1158eb6dc19dSTrond Myklebust if (IS_ERR(gss_auth)) 1159eb6dc19dSTrond Myklebust return ERR_CAST(gss_auth); 1160eb6dc19dSTrond Myklebust return &gss_auth->rpc_auth; 1161eb6dc19dSTrond Myklebust } 1162eb6dc19dSTrond Myklebust 11630df7fb74STrond Myklebust /* 11640df7fb74STrond Myklebust * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 11650df7fb74STrond Myklebust * to the server with the GSS control procedure field set to 11660df7fb74STrond Myklebust * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 11670df7fb74STrond Myklebust * all RPCSEC_GSS state associated with that context. 11680df7fb74STrond Myklebust */ 11690df7fb74STrond Myklebust static int 11700df7fb74STrond Myklebust gss_destroying_context(struct rpc_cred *cred) 11710df7fb74STrond Myklebust { 11720df7fb74STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 11730df7fb74STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 11740df7fb74STrond Myklebust struct rpc_task *task; 11750df7fb74STrond Myklebust 11760df7fb74STrond Myklebust if (gss_cred->gc_ctx == NULL || 11776dcd3926SJeff Layton test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 11780df7fb74STrond Myklebust return 0; 11790df7fb74STrond Myklebust 11800df7fb74STrond Myklebust gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 11810df7fb74STrond Myklebust cred->cr_ops = &gss_nullops; 11820df7fb74STrond Myklebust 11830df7fb74STrond Myklebust /* Take a reference to ensure the cred will be destroyed either 11840df7fb74STrond Myklebust * by the RPC call or by the put_rpccred() below */ 11850df7fb74STrond Myklebust get_rpccred(cred); 11860df7fb74STrond Myklebust 1187080a1f14STrond Myklebust task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 11880df7fb74STrond Myklebust if (!IS_ERR(task)) 11890df7fb74STrond Myklebust rpc_put_task(task); 11900df7fb74STrond Myklebust 11910df7fb74STrond Myklebust put_rpccred(cred); 11920df7fb74STrond Myklebust return 1; 11930df7fb74STrond Myklebust } 11940df7fb74STrond Myklebust 11950df7fb74STrond Myklebust /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 11961da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 11971da177e4SLinus Torvalds * allocated before freeing them. */ 11981da177e4SLinus Torvalds static void 11995d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 12001da177e4SLinus Torvalds { 1201632f0d05SChuck Lever dprintk("RPC: %s\n", __func__); 12021da177e4SLinus Torvalds 12030d8a3746STrond Myklebust gss_delete_sec_context(&ctx->gc_gss_ctx); 12041da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 12051da177e4SLinus Torvalds kfree(ctx); 12061da177e4SLinus Torvalds } 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds static void 12095d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 12105d28dc82STrond Myklebust { 12115d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 12125d28dc82STrond Myklebust gss_do_free_ctx(ctx); 12135d28dc82STrond Myklebust } 12145d28dc82STrond Myklebust 12155d28dc82STrond Myklebust static void 12165d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 12175d28dc82STrond Myklebust { 12185d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 12195d28dc82STrond Myklebust } 12205d28dc82STrond Myklebust 12215d28dc82STrond Myklebust static void 122231be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 12231da177e4SLinus Torvalds { 1224632f0d05SChuck Lever dprintk("RPC: %s cred=%p\n", __func__, gss_cred); 122531be5bf1STrond Myklebust kfree(gss_cred); 122631be5bf1STrond Myklebust } 12271da177e4SLinus Torvalds 122831be5bf1STrond Myklebust static void 122931be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 123031be5bf1STrond Myklebust { 123131be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 123231be5bf1STrond Myklebust gss_free_cred(gss_cred); 123331be5bf1STrond Myklebust } 12341da177e4SLinus Torvalds 123531be5bf1STrond Myklebust static void 12366dcd3926SJeff Layton gss_destroy_nullcred(struct rpc_cred *cred) 123731be5bf1STrond Myklebust { 12385d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 12390285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 12405d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 12415d28dc82STrond Myklebust 1242a9b3cd7fSStephen Hemminger RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); 124331be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 12445d28dc82STrond Myklebust if (ctx) 12455d28dc82STrond Myklebust gss_put_ctx(ctx); 12460285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 12471da177e4SLinus Torvalds } 12481da177e4SLinus Torvalds 12496dcd3926SJeff Layton static void 12506dcd3926SJeff Layton gss_destroy_cred(struct rpc_cred *cred) 12516dcd3926SJeff Layton { 12526dcd3926SJeff Layton 12536dcd3926SJeff Layton if (gss_destroying_context(cred)) 12546dcd3926SJeff Layton return; 12556dcd3926SJeff Layton gss_destroy_nullcred(cred); 12566dcd3926SJeff Layton } 12576dcd3926SJeff Layton 12581da177e4SLinus Torvalds /* 12591da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 12601da177e4SLinus Torvalds */ 12611da177e4SLinus Torvalds static struct rpc_cred * 12628a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 12631da177e4SLinus Torvalds { 12648a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 12651da177e4SLinus Torvalds } 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds static struct rpc_cred * 12688a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 12691da177e4SLinus Torvalds { 12701da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 12711da177e4SLinus Torvalds struct gss_cred *cred = NULL; 12721da177e4SLinus Torvalds int err = -ENOMEM; 12731da177e4SLinus Torvalds 1274632f0d05SChuck Lever dprintk("RPC: %s for uid %d, flavor %d\n", 1275cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, acred->uid), 1276cdba321eSEric W. Biederman auth->au_flavor); 12771da177e4SLinus Torvalds 12780f38b873STrond Myklebust if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 12791da177e4SLinus Torvalds goto out_err; 12801da177e4SLinus Torvalds 12815fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 12821da177e4SLinus Torvalds /* 12831da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 12841da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 12851da177e4SLinus Torvalds */ 1286fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 12871da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 128868c97153STrond Myklebust cred->gc_principal = NULL; 128968c97153STrond Myklebust if (acred->machine_cred) 129068c97153STrond Myklebust cred->gc_principal = acred->principal; 12910285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 12921da177e4SLinus Torvalds return &cred->gc_base; 12931da177e4SLinus Torvalds 12941da177e4SLinus Torvalds out_err: 1295632f0d05SChuck Lever dprintk("RPC: %s failed with error %d\n", __func__, err); 12961da177e4SLinus Torvalds return ERR_PTR(err); 12971da177e4SLinus Torvalds } 12981da177e4SLinus Torvalds 12991da177e4SLinus Torvalds static int 1300fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 1301fba3bad4STrond Myklebust { 1302fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 1303fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 1304fba3bad4STrond Myklebust int err; 1305fba3bad4STrond Myklebust 1306fba3bad4STrond Myklebust do { 1307fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 1308fba3bad4STrond Myklebust } while (err == -EAGAIN); 1309fba3bad4STrond Myklebust return err; 1310fba3bad4STrond Myklebust } 1311fba3bad4STrond Myklebust 13124de6caa2SAndy Adamson /* 13134de6caa2SAndy Adamson * Returns -EACCES if GSS context is NULL or will expire within the 13144de6caa2SAndy Adamson * timeout (miliseconds) 13154de6caa2SAndy Adamson */ 13164de6caa2SAndy Adamson static int 13174de6caa2SAndy Adamson gss_key_timeout(struct rpc_cred *rc) 13184de6caa2SAndy Adamson { 13194de6caa2SAndy Adamson struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 13204de6caa2SAndy Adamson unsigned long now = jiffies; 13214de6caa2SAndy Adamson unsigned long expire; 13224de6caa2SAndy Adamson 13234de6caa2SAndy Adamson if (gss_cred->gc_ctx == NULL) 13244de6caa2SAndy Adamson return -EACCES; 13254de6caa2SAndy Adamson 13264de6caa2SAndy Adamson expire = gss_cred->gc_ctx->gc_expiry - (gss_key_expire_timeo * HZ); 13274de6caa2SAndy Adamson 13284de6caa2SAndy Adamson if (time_after(now, expire)) 13294de6caa2SAndy Adamson return -EACCES; 13304de6caa2SAndy Adamson return 0; 13314de6caa2SAndy Adamson } 13324de6caa2SAndy Adamson 1333fba3bad4STrond Myklebust static int 13348a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 13351da177e4SLinus Torvalds { 13361da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 13374de6caa2SAndy Adamson int ret; 13381da177e4SLinus Torvalds 1339cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 13408a317760STrond Myklebust goto out; 13411da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 1342cd019f75STrond Myklebust if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 1343cd019f75STrond Myklebust return 0; 1344cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 13451da177e4SLinus Torvalds return 0; 13468a317760STrond Myklebust out: 134768c97153STrond Myklebust if (acred->principal != NULL) { 134868c97153STrond Myklebust if (gss_cred->gc_principal == NULL) 134968c97153STrond Myklebust return 0; 13504de6caa2SAndy Adamson ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; 13514de6caa2SAndy Adamson goto check_expire; 135268c97153STrond Myklebust } 135368c97153STrond Myklebust if (gss_cred->gc_principal != NULL) 13547c67db3aSTrond Myklebust return 0; 13554de6caa2SAndy Adamson ret = uid_eq(rc->cr_uid, acred->uid); 13564de6caa2SAndy Adamson 13574de6caa2SAndy Adamson check_expire: 13584de6caa2SAndy Adamson if (ret == 0) 13594de6caa2SAndy Adamson return ret; 13604de6caa2SAndy Adamson 13614de6caa2SAndy Adamson /* Notify acred users of GSS context expiration timeout */ 13624de6caa2SAndy Adamson if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) && 13634de6caa2SAndy Adamson (gss_key_timeout(rc) != 0)) { 13644de6caa2SAndy Adamson /* test will now be done from generic cred */ 13654de6caa2SAndy Adamson test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags); 13664de6caa2SAndy Adamson /* tell NFS layer that key will expire soon */ 13674de6caa2SAndy Adamson set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags); 13684de6caa2SAndy Adamson } 13694de6caa2SAndy Adamson return ret; 13701da177e4SLinus Torvalds } 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds /* 13731da177e4SLinus Torvalds * Marshal credentials. 13741da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 13751da177e4SLinus Torvalds */ 1376d8ed029dSAlexey Dobriyan static __be32 * 1377d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 13781da177e4SLinus Torvalds { 1379a17c2153STrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 1380a17c2153STrond Myklebust struct rpc_cred *cred = req->rq_cred; 13811da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 13821da177e4SLinus Torvalds gc_base); 13831da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1384d8ed029dSAlexey Dobriyan __be32 *cred_len; 13851da177e4SLinus Torvalds u32 maj_stat = 0; 13861da177e4SLinus Torvalds struct xdr_netobj mic; 13871da177e4SLinus Torvalds struct kvec iov; 13881da177e4SLinus Torvalds struct xdr_buf verf_buf; 13891da177e4SLinus Torvalds 1390632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 13911da177e4SLinus Torvalds 13921da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 13931da177e4SLinus Torvalds cred_len = p++; 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 13961da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 13971da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 13981da177e4SLinus Torvalds 13991da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 14001da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 14011da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 14021da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 14031da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 14041da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 14051da177e4SLinus Torvalds 14061da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 14071da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 1408a4f0835cSTrond Myklebust iov.iov_base = xprt_skip_transport_header(req->rq_xprt, 1409808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 14101da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 14111da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 14121da177e4SLinus Torvalds 14131da177e4SLinus Torvalds /* set verifier flavor*/ 14141da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 14151da177e4SLinus Torvalds 14161da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 141700fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 14181da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 1419fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 14201da177e4SLinus Torvalds } else if (maj_stat != 0) { 14211da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 14221da177e4SLinus Torvalds goto out_put_ctx; 14231da177e4SLinus Torvalds } 14241da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 14251da177e4SLinus Torvalds gss_put_ctx(ctx); 14261da177e4SLinus Torvalds return p; 14271da177e4SLinus Torvalds out_put_ctx: 14281da177e4SLinus Torvalds gss_put_ctx(ctx); 14291da177e4SLinus Torvalds return NULL; 14301da177e4SLinus Torvalds } 14311da177e4SLinus Torvalds 1432cd019f75STrond Myklebust static int gss_renew_cred(struct rpc_task *task) 1433cd019f75STrond Myklebust { 1434a17c2153STrond Myklebust struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; 1435cd019f75STrond Myklebust struct gss_cred *gss_cred = container_of(oldcred, 1436cd019f75STrond Myklebust struct gss_cred, 1437cd019f75STrond Myklebust gc_base); 1438cd019f75STrond Myklebust struct rpc_auth *auth = oldcred->cr_auth; 1439cd019f75STrond Myklebust struct auth_cred acred = { 1440cd019f75STrond Myklebust .uid = oldcred->cr_uid, 144168c97153STrond Myklebust .principal = gss_cred->gc_principal, 144268c97153STrond Myklebust .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), 1443cd019f75STrond Myklebust }; 1444cd019f75STrond Myklebust struct rpc_cred *new; 1445cd019f75STrond Myklebust 1446cd019f75STrond Myklebust new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 1447cd019f75STrond Myklebust if (IS_ERR(new)) 1448cd019f75STrond Myklebust return PTR_ERR(new); 1449a17c2153STrond Myklebust task->tk_rqstp->rq_cred = new; 1450cd019f75STrond Myklebust put_rpccred(oldcred); 1451cd019f75STrond Myklebust return 0; 1452cd019f75STrond Myklebust } 1453cd019f75STrond Myklebust 1454126e216aSTrond Myklebust static int gss_cred_is_negative_entry(struct rpc_cred *cred) 1455126e216aSTrond Myklebust { 1456126e216aSTrond Myklebust if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { 1457126e216aSTrond Myklebust unsigned long now = jiffies; 1458126e216aSTrond Myklebust unsigned long begin, expire; 1459126e216aSTrond Myklebust struct gss_cred *gss_cred; 1460126e216aSTrond Myklebust 1461126e216aSTrond Myklebust gss_cred = container_of(cred, struct gss_cred, gc_base); 1462126e216aSTrond Myklebust begin = gss_cred->gc_upcall_timestamp; 1463126e216aSTrond Myklebust expire = begin + gss_expired_cred_retry_delay * HZ; 1464126e216aSTrond Myklebust 1465126e216aSTrond Myklebust if (time_in_range_open(now, begin, expire)) 1466126e216aSTrond Myklebust return 1; 1467126e216aSTrond Myklebust } 1468126e216aSTrond Myklebust return 0; 1469126e216aSTrond Myklebust } 1470126e216aSTrond Myklebust 14711da177e4SLinus Torvalds /* 14721da177e4SLinus Torvalds * Refresh credentials. XXX - finish 14731da177e4SLinus Torvalds */ 14741da177e4SLinus Torvalds static int 14751da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 14761da177e4SLinus Torvalds { 1477a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 1478cd019f75STrond Myklebust int ret = 0; 14791da177e4SLinus Torvalds 1480126e216aSTrond Myklebust if (gss_cred_is_negative_entry(cred)) 1481126e216aSTrond Myklebust return -EKEYEXPIRED; 1482126e216aSTrond Myklebust 1483cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 1484cd019f75STrond Myklebust !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 1485cd019f75STrond Myklebust ret = gss_renew_cred(task); 1486cd019f75STrond Myklebust if (ret < 0) 1487cd019f75STrond Myklebust goto out; 1488a17c2153STrond Myklebust cred = task->tk_rqstp->rq_cred; 1489cd019f75STrond Myklebust } 1490cd019f75STrond Myklebust 1491cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 1492cd019f75STrond Myklebust ret = gss_refresh_upcall(task); 1493cd019f75STrond Myklebust out: 1494cd019f75STrond Myklebust return ret; 14951da177e4SLinus Torvalds } 14961da177e4SLinus Torvalds 14970df7fb74STrond Myklebust /* Dummy refresh routine: used only when destroying the context */ 14980df7fb74STrond Myklebust static int 14990df7fb74STrond Myklebust gss_refresh_null(struct rpc_task *task) 15000df7fb74STrond Myklebust { 15010df7fb74STrond Myklebust return -EACCES; 15020df7fb74STrond Myklebust } 15030df7fb74STrond Myklebust 1504d8ed029dSAlexey Dobriyan static __be32 * 1505d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 15061da177e4SLinus Torvalds { 1507a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 15081da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1509d8ed029dSAlexey Dobriyan __be32 seq; 15101da177e4SLinus Torvalds struct kvec iov; 15111da177e4SLinus Torvalds struct xdr_buf verf_buf; 15121da177e4SLinus Torvalds struct xdr_netobj mic; 15131da177e4SLinus Torvalds u32 flav,len; 15141da177e4SLinus Torvalds u32 maj_stat; 151535fa5f7bSAndy Adamson __be32 *ret = ERR_PTR(-EIO); 15161da177e4SLinus Torvalds 1517632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 15181da177e4SLinus Torvalds 15191da177e4SLinus Torvalds flav = ntohl(*p++); 15201da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 15211da177e4SLinus Torvalds goto out_bad; 15221da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 15231da177e4SLinus Torvalds goto out_bad; 15241da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 15251da177e4SLinus Torvalds iov.iov_base = &seq; 15261da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 15271da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 15281da177e4SLinus Torvalds mic.data = (u8 *)p; 15291da177e4SLinus Torvalds mic.len = len; 15301da177e4SLinus Torvalds 153135fa5f7bSAndy Adamson ret = ERR_PTR(-EACCES); 153200fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 15331da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1534fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 15350df7fb74STrond Myklebust if (maj_stat) { 1536632f0d05SChuck Lever dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", 1537632f0d05SChuck Lever task->tk_pid, __func__, maj_stat); 15381da177e4SLinus Torvalds goto out_bad; 15390df7fb74STrond Myklebust } 154024b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 154124b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 15421be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 15431da177e4SLinus Torvalds gss_put_ctx(ctx); 1544632f0d05SChuck Lever dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", 1545632f0d05SChuck Lever task->tk_pid, __func__); 15461da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 15471da177e4SLinus Torvalds out_bad: 15481da177e4SLinus Torvalds gss_put_ctx(ctx); 154935fa5f7bSAndy Adamson dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, 155035fa5f7bSAndy Adamson PTR_ERR(ret)); 155135fa5f7bSAndy Adamson return ret; 15521da177e4SLinus Torvalds } 15531da177e4SLinus Torvalds 15549f06c719SChuck Lever static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, 15559f06c719SChuck Lever __be32 *p, void *obj) 15569f06c719SChuck Lever { 15579f06c719SChuck Lever struct xdr_stream xdr; 15589f06c719SChuck Lever 15599f06c719SChuck Lever xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); 15609f06c719SChuck Lever encode(rqstp, &xdr, obj); 15619f06c719SChuck Lever } 15629f06c719SChuck Lever 15631da177e4SLinus Torvalds static inline int 15641da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 15659f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 15669f06c719SChuck Lever __be32 *p, void *obj) 15671da177e4SLinus Torvalds { 15681da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 15691da177e4SLinus Torvalds struct xdr_buf integ_buf; 1570d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 15711da177e4SLinus Torvalds struct xdr_netobj mic; 1572d8ed029dSAlexey Dobriyan u32 offset; 1573d8ed029dSAlexey Dobriyan __be32 *q; 15741da177e4SLinus Torvalds struct kvec *iov; 15751da177e4SLinus Torvalds u32 maj_stat = 0; 15761da177e4SLinus Torvalds int status = -EIO; 15771da177e4SLinus Torvalds 15781da177e4SLinus Torvalds integ_len = p++; 15791da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 15801da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 15811da177e4SLinus Torvalds 15829f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 15831da177e4SLinus Torvalds 15841da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 15851da177e4SLinus Torvalds offset, snd_buf->len - offset)) 15861da177e4SLinus Torvalds return status; 15871da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 15881da177e4SLinus Torvalds 15891da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 15901da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 15911da177e4SLinus Torvalds iov = snd_buf->tail; 15921da177e4SLinus Torvalds else 15931da177e4SLinus Torvalds iov = snd_buf->head; 15941da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 15951da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 15961da177e4SLinus Torvalds 159700fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 15981da177e4SLinus Torvalds status = -EIO; /* XXX? */ 15991da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1600fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 16011da177e4SLinus Torvalds else if (maj_stat) 16021da177e4SLinus Torvalds return status; 16031da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 16061da177e4SLinus Torvalds iov->iov_len += offset; 16071da177e4SLinus Torvalds snd_buf->len += offset; 16081da177e4SLinus Torvalds return 0; 16091da177e4SLinus Torvalds } 16101da177e4SLinus Torvalds 16112d2da60cSJ. Bruce Fields static void 16122d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 16132d2da60cSJ. Bruce Fields { 16142d2da60cSJ. Bruce Fields int i; 16152d2da60cSJ. Bruce Fields 16162d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 16172d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 16182d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 16192d2da60cSJ. Bruce Fields } 16202d2da60cSJ. Bruce Fields 16212d2da60cSJ. Bruce Fields static int 16222d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 16232d2da60cSJ. Bruce Fields { 16242d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 16252d2da60cSJ. Bruce Fields int first, last, i; 16262d2da60cSJ. Bruce Fields 16272d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 16282d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 16292d2da60cSJ. Bruce Fields return 0; 16302d2da60cSJ. Bruce Fields } 16312d2da60cSJ. Bruce Fields 16322d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 16332d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 16342d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 16352d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 16362d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 16372d2da60cSJ. Bruce Fields GFP_NOFS); 16382d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 16392d2da60cSJ. Bruce Fields goto out; 16402d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 16412d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 16422d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 16432d2da60cSJ. Bruce Fields goto out_free; 16442d2da60cSJ. Bruce Fields } 16452d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 16462d2da60cSJ. Bruce Fields return 0; 16472d2da60cSJ. Bruce Fields out_free: 1648cdead7cfSTrond Myklebust rqstp->rq_enc_pages_num = i; 1649cdead7cfSTrond Myklebust priv_release_snd_buf(rqstp); 16502d2da60cSJ. Bruce Fields out: 16512d2da60cSJ. Bruce Fields return -EAGAIN; 16522d2da60cSJ. Bruce Fields } 16532d2da60cSJ. Bruce Fields 16542d2da60cSJ. Bruce Fields static inline int 16552d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 16569f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 16579f06c719SChuck Lever __be32 *p, void *obj) 16582d2da60cSJ. Bruce Fields { 16592d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 16602d2da60cSJ. Bruce Fields u32 offset; 16612d2da60cSJ. Bruce Fields u32 maj_stat; 16622d2da60cSJ. Bruce Fields int status; 1663d8ed029dSAlexey Dobriyan __be32 *opaque_len; 16642d2da60cSJ. Bruce Fields struct page **inpages; 16652d2da60cSJ. Bruce Fields int first; 16662d2da60cSJ. Bruce Fields int pad; 16672d2da60cSJ. Bruce Fields struct kvec *iov; 16682d2da60cSJ. Bruce Fields char *tmp; 16692d2da60cSJ. Bruce Fields 16702d2da60cSJ. Bruce Fields opaque_len = p++; 16712d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 16722d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 16732d2da60cSJ. Bruce Fields 16749f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 16752d2da60cSJ. Bruce Fields 16762d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 16772d2da60cSJ. Bruce Fields if (status) 16782d2da60cSJ. Bruce Fields return status; 16792d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 16802d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 16812d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 16822d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 16837561042fSKevin Coffman /* 16847561042fSKevin Coffman * Give the tail its own page, in case we need extra space in the 16857561042fSKevin Coffman * head when wrapping: 16867561042fSKevin Coffman * 16877561042fSKevin Coffman * call_allocate() allocates twice the slack space required 16887561042fSKevin Coffman * by the authentication flavor to rq_callsize. 16897561042fSKevin Coffman * For GSS, slack is GSS_CRED_SLACK. 16907561042fSKevin Coffman */ 16912d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 16922d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 16932d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 16942d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 16952d2da60cSJ. Bruce Fields } 169600fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 16977561042fSKevin Coffman /* slack space should prevent this ever happening: */ 16982d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 16992d2da60cSJ. Bruce Fields status = -EIO; 17002d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 17012d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 17022d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1703fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 17042d2da60cSJ. Bruce Fields else if (maj_stat) 17052d2da60cSJ. Bruce Fields return status; 17062d2da60cSJ. Bruce Fields 17072d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 17082d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 17092d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 17102d2da60cSJ. Bruce Fields iov = snd_buf->tail; 17112d2da60cSJ. Bruce Fields else 17122d2da60cSJ. Bruce Fields iov = snd_buf->head; 17132d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 17142d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 17152d2da60cSJ. Bruce Fields memset(p, 0, pad); 17162d2da60cSJ. Bruce Fields iov->iov_len += pad; 17172d2da60cSJ. Bruce Fields snd_buf->len += pad; 17182d2da60cSJ. Bruce Fields 17192d2da60cSJ. Bruce Fields return 0; 17202d2da60cSJ. Bruce Fields } 17212d2da60cSJ. Bruce Fields 17221da177e4SLinus Torvalds static int 17231da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 17249f06c719SChuck Lever kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) 17251da177e4SLinus Torvalds { 1726a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 17271da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 17281da177e4SLinus Torvalds gc_base); 17291da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 17301da177e4SLinus Torvalds int status = -EIO; 17311da177e4SLinus Torvalds 1732632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 17331da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 17341da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 17351da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 17361da177e4SLinus Torvalds */ 17379f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 17389f06c719SChuck Lever status = 0; 17391da177e4SLinus Torvalds goto out; 17401da177e4SLinus Torvalds } 17411da177e4SLinus Torvalds switch (gss_cred->gc_service) { 17421da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 17439f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 17449f06c719SChuck Lever status = 0; 17451da177e4SLinus Torvalds break; 17461da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 174789f0e4feSJoe Perches status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); 17481da177e4SLinus Torvalds break; 17491da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 175089f0e4feSJoe Perches status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); 17511da177e4SLinus Torvalds break; 17521da177e4SLinus Torvalds } 17531da177e4SLinus Torvalds out: 17541da177e4SLinus Torvalds gss_put_ctx(ctx); 1755632f0d05SChuck Lever dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); 17561da177e4SLinus Torvalds return status; 17571da177e4SLinus Torvalds } 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds static inline int 17601da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1761d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 17621da177e4SLinus Torvalds { 17631da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 17641da177e4SLinus Torvalds struct xdr_buf integ_buf; 17651da177e4SLinus Torvalds struct xdr_netobj mic; 17661da177e4SLinus Torvalds u32 data_offset, mic_offset; 17671da177e4SLinus Torvalds u32 integ_len; 17681da177e4SLinus Torvalds u32 maj_stat; 17691da177e4SLinus Torvalds int status = -EIO; 17701da177e4SLinus Torvalds 17711da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 17721da177e4SLinus Torvalds if (integ_len & 3) 17731da177e4SLinus Torvalds return status; 17741da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 17751da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 17761da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 17771da177e4SLinus Torvalds return status; 17781da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 17791da177e4SLinus Torvalds return status; 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 17821da177e4SLinus Torvalds mic_offset - data_offset)) 17831da177e4SLinus Torvalds return status; 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 17861da177e4SLinus Torvalds return status; 17871da177e4SLinus Torvalds 178800fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 17891da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1790fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 17911da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 17921da177e4SLinus Torvalds return status; 17931da177e4SLinus Torvalds return 0; 17941da177e4SLinus Torvalds } 17951da177e4SLinus Torvalds 17962d2da60cSJ. Bruce Fields static inline int 17972d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1798d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 17992d2da60cSJ. Bruce Fields { 18002d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 18012d2da60cSJ. Bruce Fields u32 offset; 18022d2da60cSJ. Bruce Fields u32 opaque_len; 18032d2da60cSJ. Bruce Fields u32 maj_stat; 18042d2da60cSJ. Bruce Fields int status = -EIO; 18052d2da60cSJ. Bruce Fields 18062d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 18072d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 18082d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 18092d2da60cSJ. Bruce Fields return status; 18102d2da60cSJ. Bruce Fields /* remove padding: */ 18112d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 18122d2da60cSJ. Bruce Fields 181300fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 18142d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1815fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 18162d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 18172d2da60cSJ. Bruce Fields return status; 18182d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 18192d2da60cSJ. Bruce Fields return status; 18202d2da60cSJ. Bruce Fields 18212d2da60cSJ. Bruce Fields return 0; 18222d2da60cSJ. Bruce Fields } 18232d2da60cSJ. Bruce Fields 1824bf269551SChuck Lever static int 1825bf269551SChuck Lever gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, 1826bf269551SChuck Lever __be32 *p, void *obj) 1827bf269551SChuck Lever { 1828bf269551SChuck Lever struct xdr_stream xdr; 1829bf269551SChuck Lever 1830bf269551SChuck Lever xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); 1831bf269551SChuck Lever return decode(rqstp, &xdr, obj); 1832bf269551SChuck Lever } 18332d2da60cSJ. Bruce Fields 18341da177e4SLinus Torvalds static int 18351da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1836bf269551SChuck Lever kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) 18371da177e4SLinus Torvalds { 1838a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 18391da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 18401da177e4SLinus Torvalds gc_base); 18411da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1842d8ed029dSAlexey Dobriyan __be32 *savedp = p; 18432d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 18442d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 18451da177e4SLinus Torvalds int status = -EIO; 18461da177e4SLinus Torvalds 18471da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 18481da177e4SLinus Torvalds goto out_decode; 18491da177e4SLinus Torvalds switch (gss_cred->gc_service) { 18501da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 18511da177e4SLinus Torvalds break; 18521da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 18531da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 18541da177e4SLinus Torvalds if (status) 18551da177e4SLinus Torvalds goto out; 18561da177e4SLinus Torvalds break; 18571da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 18582d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 18592d2da60cSJ. Bruce Fields if (status) 18602d2da60cSJ. Bruce Fields goto out; 18611da177e4SLinus Torvalds break; 18621da177e4SLinus Torvalds } 186324b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 18641be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 18652d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 18661da177e4SLinus Torvalds out_decode: 1867bf269551SChuck Lever status = gss_unwrap_req_decode(decode, rqstp, p, obj); 18681da177e4SLinus Torvalds out: 18691da177e4SLinus Torvalds gss_put_ctx(ctx); 1870632f0d05SChuck Lever dprintk("RPC: %5u %s returning %d\n", 1871632f0d05SChuck Lever task->tk_pid, __func__, status); 18721da177e4SLinus Torvalds return status; 18731da177e4SLinus Torvalds } 18741da177e4SLinus Torvalds 1875f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 18761da177e4SLinus Torvalds .owner = THIS_MODULE, 18771da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 18781da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 18791da177e4SLinus Torvalds .create = gss_create, 18801da177e4SLinus Torvalds .destroy = gss_destroy, 18811da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 188280df9d20SStanislav Kinsbursky .crcreate = gss_create_cred, 18836a1a1e34SChuck Lever .list_pseudoflavors = gss_mech_list_pseudoflavors, 18849568c5e9SChuck Lever .info2flavor = gss_mech_info2flavor, 1885a77c806fSChuck Lever .flavor2info = gss_mech_flavor2info, 18861da177e4SLinus Torvalds }; 18871da177e4SLinus Torvalds 1888f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 18891da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 18901da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1891fba3bad4STrond Myklebust .cr_init = gss_cred_init, 18925c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 18931da177e4SLinus Torvalds .crmatch = gss_match, 18941da177e4SLinus Torvalds .crmarshal = gss_marshal, 18951da177e4SLinus Torvalds .crrefresh = gss_refresh, 18961da177e4SLinus Torvalds .crvalidate = gss_validate, 18971da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 18981da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 18994de6caa2SAndy Adamson .crkey_timeout = gss_key_timeout, 19001da177e4SLinus Torvalds }; 19011da177e4SLinus Torvalds 19020df7fb74STrond Myklebust static const struct rpc_credops gss_nullops = { 19030df7fb74STrond Myklebust .cr_name = "AUTH_GSS", 19046dcd3926SJeff Layton .crdestroy = gss_destroy_nullcred, 19055c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 19060df7fb74STrond Myklebust .crmatch = gss_match, 19070df7fb74STrond Myklebust .crmarshal = gss_marshal, 19080df7fb74STrond Myklebust .crrefresh = gss_refresh_null, 19090df7fb74STrond Myklebust .crvalidate = gss_validate, 19100df7fb74STrond Myklebust .crwrap_req = gss_wrap_req, 19110df7fb74STrond Myklebust .crunwrap_resp = gss_unwrap_resp, 19120df7fb74STrond Myklebust }; 19130df7fb74STrond Myklebust 1914b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0 = { 1915c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 19161da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 19171da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 191834769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v0, 191934769fc4S\"J. Bruce Fields\ .release_pipe = gss_pipe_release, 192034769fc4S\"J. Bruce Fields\ }; 192134769fc4S\"J. Bruce Fields\ 1922b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1 = { 1923c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 192434769fc4S\"J. Bruce Fields\ .downcall = gss_pipe_downcall, 192534769fc4S\"J. Bruce Fields\ .destroy_msg = gss_pipe_destroy_msg, 192634769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v1, 19271da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 19281da177e4SLinus Torvalds }; 19291da177e4SLinus Torvalds 1930a1db410dSStanislav Kinsbursky static __net_init int rpcsec_gss_init_net(struct net *net) 1931a1db410dSStanislav Kinsbursky { 1932a1db410dSStanislav Kinsbursky return gss_svc_init_net(net); 1933a1db410dSStanislav Kinsbursky } 1934a1db410dSStanislav Kinsbursky 1935a1db410dSStanislav Kinsbursky static __net_exit void rpcsec_gss_exit_net(struct net *net) 1936a1db410dSStanislav Kinsbursky { 1937a1db410dSStanislav Kinsbursky gss_svc_shutdown_net(net); 1938a1db410dSStanislav Kinsbursky } 1939a1db410dSStanislav Kinsbursky 1940a1db410dSStanislav Kinsbursky static struct pernet_operations rpcsec_gss_net_ops = { 1941a1db410dSStanislav Kinsbursky .init = rpcsec_gss_init_net, 1942a1db410dSStanislav Kinsbursky .exit = rpcsec_gss_exit_net, 1943a1db410dSStanislav Kinsbursky }; 1944a1db410dSStanislav Kinsbursky 19451da177e4SLinus Torvalds /* 19461da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 19471da177e4SLinus Torvalds */ 19481da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 19491da177e4SLinus Torvalds { 19501da177e4SLinus Torvalds int err = 0; 19511da177e4SLinus Torvalds 19521da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 19531da177e4SLinus Torvalds if (err) 19541da177e4SLinus Torvalds goto out; 19551da177e4SLinus Torvalds err = gss_svc_init(); 19561da177e4SLinus Torvalds if (err) 19571da177e4SLinus Torvalds goto out_unregister; 1958a1db410dSStanislav Kinsbursky err = register_pernet_subsys(&rpcsec_gss_net_ops); 1959a1db410dSStanislav Kinsbursky if (err) 1960a1db410dSStanislav Kinsbursky goto out_svc_exit; 196179a3f20bS\"J. Bruce Fields\ rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); 19621da177e4SLinus Torvalds return 0; 1963a1db410dSStanislav Kinsbursky out_svc_exit: 1964a1db410dSStanislav Kinsbursky gss_svc_shutdown(); 19651da177e4SLinus Torvalds out_unregister: 19661da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 19671da177e4SLinus Torvalds out: 19681da177e4SLinus Torvalds return err; 19691da177e4SLinus Torvalds } 19701da177e4SLinus Torvalds 19711da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 19721da177e4SLinus Torvalds { 1973a1db410dSStanislav Kinsbursky unregister_pernet_subsys(&rpcsec_gss_net_ops); 19741da177e4SLinus Torvalds gss_svc_shutdown(); 19751da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 1976bf12691dSJesper Dangaard Brouer rcu_barrier(); /* Wait for completion of call_rcu()'s */ 19771da177e4SLinus Torvalds } 19781da177e4SLinus Torvalds 197971afa85eSChuck Lever MODULE_ALIAS("rpc-auth-6"); 19801da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1981126e216aSTrond Myklebust module_param_named(expired_cred_retry_delay, 1982126e216aSTrond Myklebust gss_expired_cred_retry_delay, 1983126e216aSTrond Myklebust uint, 0644); 1984126e216aSTrond Myklebust MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " 1985126e216aSTrond Myklebust "the RPC engine retries an expired credential"); 1986126e216aSTrond Myklebust 19874de6caa2SAndy Adamson module_param_named(key_expire_timeo, 19884de6caa2SAndy Adamson gss_key_expire_timeo, 19894de6caa2SAndy Adamson uint, 0644); 19904de6caa2SAndy Adamson MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " 19914de6caa2SAndy Adamson "credential keys lifetime where the NFS layer cleans up " 19924de6caa2SAndy Adamson "prior to key expiration"); 19934de6caa2SAndy Adamson 19941da177e4SLinus Torvalds module_init(init_rpcsec_gss) 19951da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1996