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); 1119eb2ddb4STrond Myklebust static void gss_put_auth(struct gss_auth *gss_auth); 112cf81939dS\"J. Bruce Fields\ 1135d28dc82STrond Myklebust static void gss_free_ctx(struct gss_cl_ctx *); 114b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0; 115b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1; 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds static inline struct gss_cl_ctx * 1181da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds atomic_inc(&ctx->count); 1211da177e4SLinus Torvalds return ctx; 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds static inline void 1251da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1261da177e4SLinus Torvalds { 1271da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1285d28dc82STrond Myklebust gss_free_ctx(ctx); 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 1315d28dc82STrond Myklebust /* gss_cred_set_ctx: 1325d28dc82STrond Myklebust * called by gss_upcall_callback and gss_create_upcall in order 1335d28dc82STrond Myklebust * to set the gss context. The actual exchange of an old context 1349beae467SStanislav Kinsbursky * and a new one is protected by the pipe->lock. 1355d28dc82STrond Myklebust */ 1361da177e4SLinus Torvalds static void 1371da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1381da177e4SLinus Torvalds { 1391da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1405d28dc82STrond Myklebust 141cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 142cd019f75STrond Myklebust return; 1437b6962b0STrond Myklebust gss_get_ctx(ctx); 144cf778b00SEric Dumazet rcu_assign_pointer(gss_cred->gc_ctx, ctx); 145fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1464e857c58SPeter Zijlstra smp_mb__before_atomic(); 147fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds static const void * 1511da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1521da177e4SLinus Torvalds { 1531da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1541da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1551da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1561da177e4SLinus Torvalds memcpy(res, p, len); 1571da177e4SLinus Torvalds return q; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds static inline const void * 1611da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1621da177e4SLinus Torvalds { 1631da177e4SLinus Torvalds const void *q; 1641da177e4SLinus Torvalds unsigned int len; 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1671da177e4SLinus Torvalds if (IS_ERR(p)) 1681da177e4SLinus Torvalds return p; 1691da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1701da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1711da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1720f38b873STrond Myklebust dest->data = kmemdup(p, len, GFP_NOFS); 1731da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1741da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1751da177e4SLinus Torvalds dest->len = len; 1761da177e4SLinus Torvalds return q; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds static struct gss_cl_ctx * 1801da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1811da177e4SLinus Torvalds { 1821da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1831da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1841da177e4SLinus Torvalds 1855d28dc82STrond Myklebust rcu_read_lock(); 1861da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1871da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1885d28dc82STrond Myklebust rcu_read_unlock(); 1891da177e4SLinus Torvalds return ctx; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds static struct gss_cl_ctx * 1931da177e4SLinus Torvalds gss_alloc_context(void) 1941da177e4SLinus Torvalds { 1951da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1961da177e4SLinus Torvalds 1970f38b873STrond Myklebust ctx = kzalloc(sizeof(*ctx), GFP_NOFS); 1981da177e4SLinus Torvalds if (ctx != NULL) { 1991da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 2001da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 2011da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 2021da177e4SLinus Torvalds atomic_set(&ctx->count,1); 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds return ctx; 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 2081da177e4SLinus Torvalds static const void * 2091da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 2101da177e4SLinus Torvalds { 2111da177e4SLinus Torvalds const void *q; 2121da177e4SLinus Torvalds unsigned int seclen; 2131da177e4SLinus Torvalds unsigned int timeout; 214620038f6SAndy Adamson unsigned long now = jiffies; 2151da177e4SLinus Torvalds u32 window_size; 2161da177e4SLinus Torvalds int ret; 2171da177e4SLinus Torvalds 218620038f6SAndy Adamson /* First unsigned int gives the remaining lifetime in seconds of the 219620038f6SAndy Adamson * credential - e.g. the remaining TGT lifetime for Kerberos or 220620038f6SAndy Adamson * the -t value passed to GSSD. 221620038f6SAndy Adamson */ 2221da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2231da177e4SLinus Torvalds if (IS_ERR(p)) 2241da177e4SLinus Torvalds goto err; 2251da177e4SLinus Torvalds if (timeout == 0) 2261da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 227620038f6SAndy Adamson ctx->gc_expiry = now + ((unsigned long)timeout * HZ); 228620038f6SAndy Adamson /* Sequence number window. Determines the maximum number of 229620038f6SAndy Adamson * simultaneous requests 230620038f6SAndy Adamson */ 2311da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2321da177e4SLinus Torvalds if (IS_ERR(p)) 2331da177e4SLinus Torvalds goto err; 2341da177e4SLinus Torvalds ctx->gc_win = window_size; 2351da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2361da177e4SLinus Torvalds if (ctx->gc_win == 0) { 237dc5ddce9SJeff Layton /* 238dc5ddce9SJeff Layton * in which case, p points to an error code. Anything other 239dc5ddce9SJeff Layton * than -EKEYEXPIRED gets converted to -EACCES. 240dc5ddce9SJeff Layton */ 241dc5ddce9SJeff Layton p = simple_get_bytes(p, end, &ret, sizeof(ret)); 242dc5ddce9SJeff Layton if (!IS_ERR(p)) 243dc5ddce9SJeff Layton p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : 244dc5ddce9SJeff Layton ERR_PTR(-EACCES); 2451da177e4SLinus Torvalds goto err; 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds /* copy the opaque wire context */ 2481da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2491da177e4SLinus Torvalds if (IS_ERR(p)) 2501da177e4SLinus Torvalds goto err; 2511da177e4SLinus Torvalds /* import the opaque security context */ 2521da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2531da177e4SLinus Torvalds if (IS_ERR(p)) 2541da177e4SLinus Torvalds goto err; 2551da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2561da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2571da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2581da177e4SLinus Torvalds goto err; 2591da177e4SLinus Torvalds } 260400f26b5SSimo Sorce ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); 2611da177e4SLinus Torvalds if (ret < 0) { 2621da177e4SLinus Torvalds p = ERR_PTR(ret); 2631da177e4SLinus Torvalds goto err; 2641da177e4SLinus Torvalds } 2652004c726SJeff Layton 2662004c726SJeff Layton /* is there any trailing data? */ 2672004c726SJeff Layton if (q == end) { 2682004c726SJeff Layton p = q; 2692004c726SJeff Layton goto done; 2702004c726SJeff Layton } 2712004c726SJeff Layton 2722004c726SJeff Layton /* pull in acceptor name (if there is one) */ 2732004c726SJeff Layton p = simple_get_netobj(q, end, &ctx->gc_acceptor); 2742004c726SJeff Layton if (IS_ERR(p)) 2752004c726SJeff Layton goto err; 2762004c726SJeff Layton done: 2772004c726SJeff Layton dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u acceptor %.*s\n", 2782004c726SJeff Layton __func__, ctx->gc_expiry, now, timeout, ctx->gc_acceptor.len, 2792004c726SJeff Layton ctx->gc_acceptor.data); 2802004c726SJeff Layton return p; 2811da177e4SLinus Torvalds err: 282173db309SJeff Layton dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); 2831da177e4SLinus Torvalds return p; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 28634769fc4S\"J. Bruce Fields\ #define UPCALL_BUF_LEN 128 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds struct gss_upcall_msg { 2891da177e4SLinus Torvalds atomic_t count; 2907eaf040bSEric W. Biederman kuid_t uid; 2911da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2921da177e4SLinus Torvalds struct list_head list; 2931da177e4SLinus Torvalds struct gss_auth *auth; 2949beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 2951da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2961da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2971da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 29834769fc4S\"J. Bruce Fields\ char databuf[UPCALL_BUF_LEN]; 2991da177e4SLinus Torvalds }; 3001da177e4SLinus Torvalds 3012aed8b47STrond Myklebust static int get_pipe_version(struct net *net) 30279a3f20bS\"J. Bruce Fields\ { 3032aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 30479a3f20bS\"J. Bruce Fields\ int ret; 30579a3f20bS\"J. Bruce Fields\ 30679a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 3072aed8b47STrond Myklebust if (sn->pipe_version >= 0) { 3082aed8b47STrond Myklebust atomic_inc(&sn->pipe_users); 3092aed8b47STrond Myklebust ret = sn->pipe_version; 31079a3f20bS\"J. Bruce Fields\ } else 31179a3f20bS\"J. Bruce Fields\ ret = -EAGAIN; 31279a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 31379a3f20bS\"J. Bruce Fields\ return ret; 31479a3f20bS\"J. Bruce Fields\ } 31579a3f20bS\"J. Bruce Fields\ 3162aed8b47STrond Myklebust static void put_pipe_version(struct net *net) 31779a3f20bS\"J. Bruce Fields\ { 3182aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 3192aed8b47STrond Myklebust 3202aed8b47STrond Myklebust if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { 3212aed8b47STrond Myklebust sn->pipe_version = -1; 32279a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 32379a3f20bS\"J. Bruce Fields\ } 32479a3f20bS\"J. Bruce Fields\ } 32579a3f20bS\"J. Bruce Fields\ 3261da177e4SLinus Torvalds static void 3271da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 3281da177e4SLinus Torvalds { 329e726340aSTrond Myklebust struct net *net = gss_msg->auth->net; 3301da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 3311da177e4SLinus Torvalds return; 3322aed8b47STrond Myklebust put_pipe_version(net); 3331da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 3341da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 3351da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 336f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 3379eb2ddb4STrond Myklebust gss_put_auth(gss_msg->auth); 3381da177e4SLinus Torvalds kfree(gss_msg); 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds static struct gss_upcall_msg * 3427eaf040bSEric W. Biederman __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid) 3431da177e4SLinus Torvalds { 3441da177e4SLinus Torvalds struct gss_upcall_msg *pos; 3459beae467SStanislav Kinsbursky list_for_each_entry(pos, &pipe->in_downcall, list) { 3460b4d51b0SEric W. Biederman if (!uid_eq(pos->uid, uid)) 3471da177e4SLinus Torvalds continue; 3481da177e4SLinus Torvalds atomic_inc(&pos->count); 349632f0d05SChuck Lever dprintk("RPC: %s found msg %p\n", __func__, pos); 3501da177e4SLinus Torvalds return pos; 3511da177e4SLinus Torvalds } 352632f0d05SChuck Lever dprintk("RPC: %s found nothing\n", __func__); 3531da177e4SLinus Torvalds return NULL; 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds 356720b8f2dS\\\"J. Bruce Fields\\\ /* Try to add an upcall to the pipefs queue. 3571da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 3581da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 3591da177e4SLinus Torvalds */ 3601da177e4SLinus Torvalds static inline struct gss_upcall_msg * 361053e324fSSuresh Jayaraman gss_add_msg(struct gss_upcall_msg *gss_msg) 3621da177e4SLinus Torvalds { 3639beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3641da177e4SLinus Torvalds struct gss_upcall_msg *old; 3651da177e4SLinus Torvalds 3669beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3679beae467SStanislav Kinsbursky old = __gss_find_upcall(pipe, gss_msg->uid); 3681da177e4SLinus Torvalds if (old == NULL) { 3691da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3709beae467SStanislav Kinsbursky list_add(&gss_msg->list, &pipe->in_downcall); 3711da177e4SLinus Torvalds } else 3721da177e4SLinus Torvalds gss_msg = old; 3739beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3741da177e4SLinus Torvalds return gss_msg; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds static void 3781da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3791da177e4SLinus Torvalds { 3801da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3811da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3821da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3831da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds static void 3871da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3881da177e4SLinus Torvalds { 3899beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3901da177e4SLinus Torvalds 3913b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3923b68aaeaSTrond Myklebust return; 3939beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3943b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3951da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 3969beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds static void 400126e216aSTrond Myklebust gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) 401126e216aSTrond Myklebust { 402126e216aSTrond Myklebust switch (gss_msg->msg.errno) { 403126e216aSTrond Myklebust case 0: 404126e216aSTrond Myklebust if (gss_msg->ctx == NULL) 405126e216aSTrond Myklebust break; 406126e216aSTrond Myklebust clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 407126e216aSTrond Myklebust gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); 408126e216aSTrond Myklebust break; 409126e216aSTrond Myklebust case -EKEYEXPIRED: 410126e216aSTrond Myklebust set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 411126e216aSTrond Myklebust } 412126e216aSTrond Myklebust gss_cred->gc_upcall_timestamp = jiffies; 413126e216aSTrond Myklebust gss_cred->gc_upcall = NULL; 414126e216aSTrond Myklebust rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 415126e216aSTrond Myklebust } 416126e216aSTrond Myklebust 417126e216aSTrond Myklebust static void 4181da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 4191da177e4SLinus Torvalds { 420a17c2153STrond Myklebust struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, 4211da177e4SLinus Torvalds struct gss_cred, gc_base); 4221da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 4239beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 4241da177e4SLinus Torvalds 4259beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 426126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 4279beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 428126e216aSTrond Myklebust task->tk_status = gss_msg->msg.errno; 4291da177e4SLinus Torvalds gss_release_msg(gss_msg); 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 43234769fc4S\"J. Bruce Fields\ static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) 43334769fc4S\"J. Bruce Fields\ { 43490602c7bSEric W. Biederman uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); 43590602c7bSEric W. Biederman memcpy(gss_msg->databuf, &uid, sizeof(uid)); 43690602c7bSEric W. Biederman gss_msg->msg.data = gss_msg->databuf; 43790602c7bSEric W. Biederman gss_msg->msg.len = sizeof(uid); 4389d3a2260STrond Myklebust 4399d3a2260STrond Myklebust BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf)); 44034769fc4S\"J. Bruce Fields\ } 44134769fc4S\"J. Bruce Fields\ 4429d3a2260STrond Myklebust static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, 443bd4a3eb1STrond Myklebust const char *service_name, 444bd4a3eb1STrond Myklebust const char *target_name) 44534769fc4S\"J. Bruce Fields\ { 446683ac665STrond Myklebust struct gss_api_mech *mech = gss_msg->auth->mech; 4478b1c7bf5SOlga Kornievskaia char *p = gss_msg->databuf; 4489d3a2260STrond Myklebust size_t buflen = sizeof(gss_msg->databuf); 4499d3a2260STrond Myklebust int len; 4508b1c7bf5SOlga Kornievskaia 4519d3a2260STrond Myklebust len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name, 45290602c7bSEric W. Biederman from_kuid(&init_user_ns, gss_msg->uid)); 4539d3a2260STrond Myklebust buflen -= len; 4549d3a2260STrond Myklebust p += len; 4559d3a2260STrond Myklebust gss_msg->msg.len = len; 456bd4a3eb1STrond Myklebust if (target_name) { 4579d3a2260STrond Myklebust len = scnprintf(p, buflen, "target=%s ", target_name); 4589d3a2260STrond Myklebust buflen -= len; 4598b1c7bf5SOlga Kornievskaia p += len; 4608b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4618b1c7bf5SOlga Kornievskaia } 46268c97153STrond Myklebust if (service_name != NULL) { 4639d3a2260STrond Myklebust len = scnprintf(p, buflen, "service=%s ", service_name); 4649d3a2260STrond Myklebust buflen -= len; 4652efef708SOlga Kornievskaia p += len; 4662efef708SOlga Kornievskaia gss_msg->msg.len += len; 4672efef708SOlga Kornievskaia } 468683ac665STrond Myklebust if (mech->gm_upcall_enctypes) { 4699d3a2260STrond Myklebust len = scnprintf(p, buflen, "enctypes=%s ", 4709d3a2260STrond Myklebust mech->gm_upcall_enctypes); 4719d3a2260STrond Myklebust buflen -= len; 472683ac665STrond Myklebust p += len; 473683ac665STrond Myklebust gss_msg->msg.len += len; 474683ac665STrond Myklebust } 4759d3a2260STrond Myklebust len = scnprintf(p, buflen, "\n"); 4769d3a2260STrond Myklebust if (len == 0) 4779d3a2260STrond Myklebust goto out_overflow; 4788b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4798b1c7bf5SOlga Kornievskaia 48034769fc4S\"J. Bruce Fields\ gss_msg->msg.data = gss_msg->databuf; 4819d3a2260STrond Myklebust return 0; 4829d3a2260STrond Myklebust out_overflow: 4839d3a2260STrond Myklebust WARN_ON_ONCE(1); 4849d3a2260STrond Myklebust return -ENOMEM; 48534769fc4S\"J. Bruce Fields\ } 48634769fc4S\"J. Bruce Fields\ 48768c97153STrond Myklebust static struct gss_upcall_msg * 488e726340aSTrond Myklebust gss_alloc_msg(struct gss_auth *gss_auth, 4897eaf040bSEric W. Biederman kuid_t uid, const char *service_name) 4901da177e4SLinus Torvalds { 4911da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 49279a3f20bS\"J. Bruce Fields\ int vers; 4939d3a2260STrond Myklebust int err = -ENOMEM; 4941da177e4SLinus Torvalds 4950f38b873STrond Myklebust gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 496db75b3d6S\"J. Bruce Fields\ if (gss_msg == NULL) 4979d3a2260STrond Myklebust goto err; 498e726340aSTrond Myklebust vers = get_pipe_version(gss_auth->net); 4999d3a2260STrond Myklebust err = vers; 5009d3a2260STrond Myklebust if (err < 0) 5019d3a2260STrond Myklebust goto err_free_msg; 50219172284STrond Myklebust gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; 5031da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 5041da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 5051da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 5061da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 5071da177e4SLinus Torvalds gss_msg->uid = uid; 5081da177e4SLinus Torvalds gss_msg->auth = gss_auth; 509bd4a3eb1STrond Myklebust switch (vers) { 510bd4a3eb1STrond Myklebust case 0: 511bd4a3eb1STrond Myklebust gss_encode_v0_msg(gss_msg); 5125fccc5b5STrond Myklebust break; 513bd4a3eb1STrond Myklebust default: 5149d3a2260STrond Myklebust err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name); 5159d3a2260STrond Myklebust if (err) 516e9776d0fSTrond Myklebust goto err_put_pipe_version; 517bd4a3eb1STrond Myklebust }; 5189eb2ddb4STrond Myklebust kref_get(&gss_auth->kref); 5191da177e4SLinus Torvalds return gss_msg; 520e9776d0fSTrond Myklebust err_put_pipe_version: 521e9776d0fSTrond Myklebust put_pipe_version(gss_auth->net); 5229d3a2260STrond Myklebust err_free_msg: 5239d3a2260STrond Myklebust kfree(gss_msg); 5249d3a2260STrond Myklebust err: 5259d3a2260STrond Myklebust return ERR_PTR(err); 5261da177e4SLinus Torvalds } 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds static struct gss_upcall_msg * 529e726340aSTrond Myklebust gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) 5301da177e4SLinus Torvalds { 5317c67db3aSTrond Myklebust struct gss_cred *gss_cred = container_of(cred, 5327c67db3aSTrond Myklebust struct gss_cred, gc_base); 5331da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 5347eaf040bSEric W. Biederman kuid_t uid = cred->cr_uid; 5351da177e4SLinus Torvalds 536e726340aSTrond Myklebust gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); 537db75b3d6S\"J. Bruce Fields\ if (IS_ERR(gss_new)) 538db75b3d6S\"J. Bruce Fields\ return gss_new; 539053e324fSSuresh Jayaraman gss_msg = gss_add_msg(gss_new); 5401da177e4SLinus Torvalds if (gss_msg == gss_new) { 5419beae467SStanislav Kinsbursky int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); 5421da177e4SLinus Torvalds if (res) { 5431da177e4SLinus Torvalds gss_unhash_msg(gss_new); 5441da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds } else 5471da177e4SLinus Torvalds gss_release_msg(gss_new); 5481da177e4SLinus Torvalds return gss_msg; 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds 551b03568c3S\"J. Bruce Fields\ static void warn_gssd(void) 552b03568c3S\"J. Bruce Fields\ { 5530ea9de0eSJeff Layton dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n"); 554b03568c3S\"J. Bruce Fields\ } 555b03568c3S\"J. Bruce Fields\ 5561da177e4SLinus Torvalds static inline int 5571da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 5581da177e4SLinus Torvalds { 559a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 5604a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 5611da177e4SLinus Torvalds struct gss_auth, rpc_auth); 5621da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 5631da177e4SLinus Torvalds struct gss_cred, gc_base); 5641da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5659beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 5661da177e4SLinus Torvalds int err = 0; 5671da177e4SLinus Torvalds 568632f0d05SChuck Lever dprintk("RPC: %5u %s for uid %u\n", 569cdba321eSEric W. Biederman task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); 570e726340aSTrond Myklebust gss_msg = gss_setup_upcall(gss_auth, cred); 571480e3243SRoel Kluin if (PTR_ERR(gss_msg) == -EAGAIN) { 57279a3f20bS\"J. Bruce Fields\ /* XXX: warning on the first, under the assumption we 57379a3f20bS\"J. Bruce Fields\ * shouldn't normally hit this case on a refresh. */ 57479a3f20bS\"J. Bruce Fields\ warn_gssd(); 57579a3f20bS\"J. Bruce Fields\ task->tk_timeout = 15*HZ; 57679a3f20bS\"J. Bruce Fields\ rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); 577d1a8016aSBryan Schumaker return -EAGAIN; 57879a3f20bS\"J. Bruce Fields\ } 5791da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 5801da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 5811da177e4SLinus Torvalds goto out; 5821da177e4SLinus Torvalds } 5839beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 5849beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 5851da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 5865d00837bSTrond Myklebust rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 587126e216aSTrond Myklebust else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 5881da177e4SLinus Torvalds task->tk_timeout = 0; 5891da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 5901da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 5911da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5925d00837bSTrond Myklebust rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 593126e216aSTrond Myklebust } else { 594126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 5951da177e4SLinus Torvalds err = gss_msg->msg.errno; 596126e216aSTrond Myklebust } 5979beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 5981da177e4SLinus Torvalds gss_release_msg(gss_msg); 5991da177e4SLinus Torvalds out: 600632f0d05SChuck Lever dprintk("RPC: %5u %s for uid %u result %d\n", 601cdba321eSEric W. Biederman task->tk_pid, __func__, 602cdba321eSEric W. Biederman from_kuid(&init_user_ns, cred->cr_uid), err); 6031da177e4SLinus Torvalds return err; 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds static inline int 6071da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 6081da177e4SLinus Torvalds { 609e726340aSTrond Myklebust struct net *net = gss_auth->net; 610abfdbd53STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 6119beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 6121da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 6131da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 6141da177e4SLinus Torvalds DEFINE_WAIT(wait); 615d36ccb9cSTrond Myklebust int err; 6161da177e4SLinus Torvalds 617cdba321eSEric W. Biederman dprintk("RPC: %s for uid %u\n", 618cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, cred->cr_uid)); 61979a3f20bS\"J. Bruce Fields\ retry: 620d36ccb9cSTrond Myklebust err = 0; 62189f84243SJeff Layton /* if gssd is down, just skip upcalling altogether */ 62289f84243SJeff Layton if (!gssd_running(net)) { 62389f84243SJeff Layton warn_gssd(); 62489f84243SJeff Layton return -EACCES; 62589f84243SJeff Layton } 626e726340aSTrond Myklebust gss_msg = gss_setup_upcall(gss_auth, cred); 62779a3f20bS\"J. Bruce Fields\ if (PTR_ERR(gss_msg) == -EAGAIN) { 62879a3f20bS\"J. Bruce Fields\ err = wait_event_interruptible_timeout(pipe_version_waitqueue, 62989f84243SJeff Layton sn->pipe_version >= 0, 15 * HZ); 6302aed8b47STrond Myklebust if (sn->pipe_version < 0) { 631d1a8016aSBryan Schumaker warn_gssd(); 632d1a8016aSBryan Schumaker err = -EACCES; 633d1a8016aSBryan Schumaker } 634d36ccb9cSTrond Myklebust if (err < 0) 63579a3f20bS\"J. Bruce Fields\ goto out; 63679a3f20bS\"J. Bruce Fields\ goto retry; 63779a3f20bS\"J. Bruce Fields\ } 6381da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 6391da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 6401da177e4SLinus Torvalds goto out; 6411da177e4SLinus Torvalds } 6429beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 6431da177e4SLinus Torvalds for (;;) { 6445afa9133STrond Myklebust prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); 6459beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 6461da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 6471da177e4SLinus Torvalds break; 6481da177e4SLinus Torvalds } 6499beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6505afa9133STrond Myklebust if (fatal_signal_pending(current)) { 6511da177e4SLinus Torvalds err = -ERESTARTSYS; 6521da177e4SLinus Torvalds goto out_intr; 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds schedule(); 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds if (gss_msg->ctx) 6577b6962b0STrond Myklebust gss_cred_set_ctx(cred, gss_msg->ctx); 6581da177e4SLinus Torvalds else 6591da177e4SLinus Torvalds err = gss_msg->msg.errno; 6609beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6611da177e4SLinus Torvalds out_intr: 6621da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 6631da177e4SLinus Torvalds gss_release_msg(gss_msg); 6641da177e4SLinus Torvalds out: 665632f0d05SChuck Lever dprintk("RPC: %s for uid %u result %d\n", 666cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, cred->cr_uid), err); 6671da177e4SLinus Torvalds return err; 6681da177e4SLinus Torvalds } 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds static ssize_t 6731da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 6741da177e4SLinus Torvalds { 6751da177e4SLinus Torvalds const void *p, *end; 6761da177e4SLinus Torvalds void *buf; 6771da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 678496ad9aaSAl Viro struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; 6791da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 68090602c7bSEric W. Biederman uid_t id; 68190602c7bSEric W. Biederman kuid_t uid; 6823b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 6851da177e4SLinus Torvalds goto out; 6861da177e4SLinus Torvalds err = -ENOMEM; 6870f38b873STrond Myklebust buf = kmalloc(mlen, GFP_NOFS); 6881da177e4SLinus Torvalds if (!buf) 6891da177e4SLinus Torvalds goto out; 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds err = -EFAULT; 6921da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 6931da177e4SLinus Torvalds goto err; 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 69690602c7bSEric W. Biederman p = simple_get_bytes(buf, end, &id, sizeof(id)); 6971da177e4SLinus Torvalds if (IS_ERR(p)) { 6981da177e4SLinus Torvalds err = PTR_ERR(p); 6991da177e4SLinus Torvalds goto err; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 70290602c7bSEric W. Biederman uid = make_kuid(&init_user_ns, id); 70390602c7bSEric W. Biederman if (!uid_valid(uid)) { 70490602c7bSEric W. Biederman err = -EINVAL; 70590602c7bSEric W. Biederman goto err; 70690602c7bSEric W. Biederman } 70790602c7bSEric W. Biederman 7081da177e4SLinus Torvalds err = -ENOMEM; 7091da177e4SLinus Torvalds ctx = gss_alloc_context(); 7101da177e4SLinus Torvalds if (ctx == NULL) 7111da177e4SLinus Torvalds goto err; 7123b68aaeaSTrond Myklebust 7133b68aaeaSTrond Myklebust err = -ENOENT; 7143b68aaeaSTrond Myklebust /* Find a matching upcall */ 7159beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7169beae467SStanislav Kinsbursky gss_msg = __gss_find_upcall(pipe, uid); 7173b68aaeaSTrond Myklebust if (gss_msg == NULL) { 7189beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7193b68aaeaSTrond Myklebust goto err_put_ctx; 7203b68aaeaSTrond Myklebust } 7213b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 7229beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7233b68aaeaSTrond Myklebust 7246e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 7251da177e4SLinus Torvalds if (IS_ERR(p)) { 7261da177e4SLinus Torvalds err = PTR_ERR(p); 727486bad2eSJeff Layton switch (err) { 728486bad2eSJeff Layton case -EACCES: 729dc5ddce9SJeff Layton case -EKEYEXPIRED: 730486bad2eSJeff Layton gss_msg->msg.errno = err; 731486bad2eSJeff Layton err = mlen; 732486bad2eSJeff Layton break; 733486bad2eSJeff Layton case -EFAULT: 734486bad2eSJeff Layton case -ENOMEM: 735486bad2eSJeff Layton case -EINVAL: 736486bad2eSJeff Layton case -ENOSYS: 737486bad2eSJeff Layton gss_msg->msg.errno = -EAGAIN; 738486bad2eSJeff Layton break; 739486bad2eSJeff Layton default: 740486bad2eSJeff Layton printk(KERN_CRIT "%s: bad return from " 7416c853099SRandy Dunlap "gss_fill_context: %zd\n", __func__, err); 742486bad2eSJeff Layton BUG(); 743486bad2eSJeff Layton } 7443b68aaeaSTrond Myklebust goto err_release_msg; 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 7473b68aaeaSTrond Myklebust err = mlen; 7483b68aaeaSTrond Myklebust 7493b68aaeaSTrond Myklebust err_release_msg: 7509beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7511da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 7529beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7531da177e4SLinus Torvalds gss_release_msg(gss_msg); 7541da177e4SLinus Torvalds err_put_ctx: 7551da177e4SLinus Torvalds gss_put_ctx(ctx); 7561da177e4SLinus Torvalds err: 7571da177e4SLinus Torvalds kfree(buf); 7581da177e4SLinus Torvalds out: 759632f0d05SChuck Lever dprintk("RPC: %s returning %Zd\n", __func__, err); 7601da177e4SLinus Torvalds return err; 7611da177e4SLinus Torvalds } 7621da177e4SLinus Torvalds 76334769fc4S\"J. Bruce Fields\ static int gss_pipe_open(struct inode *inode, int new_version) 764cf81939dS\"J. Bruce Fields\ { 7652aed8b47STrond Myklebust struct net *net = inode->i_sb->s_fs_info; 7662aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 76734769fc4S\"J. Bruce Fields\ int ret = 0; 76834769fc4S\"J. Bruce Fields\ 76979a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 7702aed8b47STrond Myklebust if (sn->pipe_version < 0) { 77134769fc4S\"J. Bruce Fields\ /* First open of any gss pipe determines the version: */ 7722aed8b47STrond Myklebust sn->pipe_version = new_version; 77379a3f20bS\"J. Bruce Fields\ rpc_wake_up(&pipe_version_rpc_waitqueue); 77479a3f20bS\"J. Bruce Fields\ wake_up(&pipe_version_waitqueue); 7752aed8b47STrond Myklebust } else if (sn->pipe_version != new_version) { 77634769fc4S\"J. Bruce Fields\ /* Trying to open a pipe of a different version */ 77734769fc4S\"J. Bruce Fields\ ret = -EBUSY; 77834769fc4S\"J. Bruce Fields\ goto out; 77979a3f20bS\"J. Bruce Fields\ } 7802aed8b47STrond Myklebust atomic_inc(&sn->pipe_users); 78134769fc4S\"J. Bruce Fields\ out: 78279a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 78334769fc4S\"J. Bruce Fields\ return ret; 78434769fc4S\"J. Bruce Fields\ 78534769fc4S\"J. Bruce Fields\ } 78634769fc4S\"J. Bruce Fields\ 78734769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v0(struct inode *inode) 78834769fc4S\"J. Bruce Fields\ { 78934769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 0); 79034769fc4S\"J. Bruce Fields\ } 79134769fc4S\"J. Bruce Fields\ 79234769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v1(struct inode *inode) 79334769fc4S\"J. Bruce Fields\ { 79434769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 1); 795cf81939dS\"J. Bruce Fields\ } 796cf81939dS\"J. Bruce Fields\ 7971da177e4SLinus Torvalds static void 7981da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 7991da177e4SLinus Torvalds { 8002aed8b47STrond Myklebust struct net *net = inode->i_sb->s_fs_info; 8019beae467SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 8021da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 8031da177e4SLinus Torvalds 8045a67657aSTrond Myklebust restart: 8059beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 8069beae467SStanislav Kinsbursky list_for_each_entry(gss_msg, &pipe->in_downcall, list) { 8076e84c7b6STrond Myklebust 8085a67657aSTrond Myklebust if (!list_empty(&gss_msg->msg.list)) 8095a67657aSTrond Myklebust continue; 8101da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 8111da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 8121da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 8139beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 8141da177e4SLinus Torvalds gss_release_msg(gss_msg); 8155a67657aSTrond Myklebust goto restart; 8161da177e4SLinus Torvalds } 8179beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 818cf81939dS\"J. Bruce Fields\ 8192aed8b47STrond Myklebust put_pipe_version(net); 8201da177e4SLinus Torvalds } 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds static void 8231da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 8241da177e4SLinus Torvalds { 8251da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 8261da177e4SLinus Torvalds 8271da177e4SLinus Torvalds if (msg->errno < 0) { 828632f0d05SChuck Lever dprintk("RPC: %s releasing msg %p\n", 829632f0d05SChuck Lever __func__, gss_msg); 8301da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 8311da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 832b03568c3S\"J. Bruce Fields\ if (msg->errno == -ETIMEDOUT) 833b03568c3S\"J. Bruce Fields\ warn_gssd(); 8341da177e4SLinus Torvalds gss_release_msg(gss_msg); 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds } 8371da177e4SLinus Torvalds 83819172284STrond Myklebust static void gss_pipe_dentry_destroy(struct dentry *dir, 83919172284STrond Myklebust struct rpc_pipe_dir_object *pdo) 840ccdc28f8SStanislav Kinsbursky { 84119172284STrond Myklebust struct gss_pipe *gss_pipe = pdo->pdo_data; 84219172284STrond Myklebust struct rpc_pipe *pipe = gss_pipe->pipe; 843ccdc28f8SStanislav Kinsbursky 84419172284STrond Myklebust if (pipe->dentry != NULL) { 84519172284STrond Myklebust rpc_unlink(pipe->dentry); 84619172284STrond Myklebust pipe->dentry = NULL; 8476b2fddd3STrond Myklebust } 848ccdc28f8SStanislav Kinsbursky } 849ccdc28f8SStanislav Kinsbursky 85019172284STrond Myklebust static int gss_pipe_dentry_create(struct dentry *dir, 85119172284STrond Myklebust struct rpc_pipe_dir_object *pdo) 852ccdc28f8SStanislav Kinsbursky { 85319172284STrond Myklebust struct gss_pipe *p = pdo->pdo_data; 8546b2fddd3STrond Myklebust struct dentry *dentry; 855ccdc28f8SStanislav Kinsbursky 85619172284STrond Myklebust dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); 85719172284STrond Myklebust if (IS_ERR(dentry)) 85819172284STrond Myklebust return PTR_ERR(dentry); 85919172284STrond Myklebust p->pipe->dentry = dentry; 860ccdc28f8SStanislav Kinsbursky return 0; 86119172284STrond Myklebust } 862ccdc28f8SStanislav Kinsbursky 86319172284STrond Myklebust static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { 86419172284STrond Myklebust .create = gss_pipe_dentry_create, 86519172284STrond Myklebust .destroy = gss_pipe_dentry_destroy, 86619172284STrond Myklebust }; 86719172284STrond Myklebust 86819172284STrond Myklebust static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, 86919172284STrond Myklebust const char *name, 87019172284STrond Myklebust const struct rpc_pipe_ops *upcall_ops) 87119172284STrond Myklebust { 87219172284STrond Myklebust struct gss_pipe *p; 87319172284STrond Myklebust int err = -ENOMEM; 87419172284STrond Myklebust 87519172284STrond Myklebust p = kmalloc(sizeof(*p), GFP_KERNEL); 87619172284STrond Myklebust if (p == NULL) 87719172284STrond Myklebust goto err; 87819172284STrond Myklebust p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 87919172284STrond Myklebust if (IS_ERR(p->pipe)) { 88019172284STrond Myklebust err = PTR_ERR(p->pipe); 88119172284STrond Myklebust goto err_free_gss_pipe; 88219172284STrond Myklebust } 88319172284STrond Myklebust p->name = name; 88419172284STrond Myklebust p->clnt = clnt; 885414a6295STrond Myklebust kref_init(&p->kref); 88619172284STrond Myklebust rpc_init_pipe_dir_object(&p->pdo, 88719172284STrond Myklebust &gss_pipe_dir_object_ops, 88819172284STrond Myklebust p); 88919172284STrond Myklebust return p; 89019172284STrond Myklebust err_free_gss_pipe: 89119172284STrond Myklebust kfree(p); 8926b2fddd3STrond Myklebust err: 89319172284STrond Myklebust return ERR_PTR(err); 894ccdc28f8SStanislav Kinsbursky } 895ccdc28f8SStanislav Kinsbursky 896414a6295STrond Myklebust struct gss_alloc_pdo { 897414a6295STrond Myklebust struct rpc_clnt *clnt; 898414a6295STrond Myklebust const char *name; 899414a6295STrond Myklebust const struct rpc_pipe_ops *upcall_ops; 900414a6295STrond Myklebust }; 901414a6295STrond Myklebust 902414a6295STrond Myklebust static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) 903414a6295STrond Myklebust { 904414a6295STrond Myklebust struct gss_pipe *gss_pipe; 905414a6295STrond Myklebust struct gss_alloc_pdo *args = data; 906414a6295STrond Myklebust 907414a6295STrond Myklebust if (pdo->pdo_ops != &gss_pipe_dir_object_ops) 908414a6295STrond Myklebust return 0; 909414a6295STrond Myklebust gss_pipe = container_of(pdo, struct gss_pipe, pdo); 910414a6295STrond Myklebust if (strcmp(gss_pipe->name, args->name) != 0) 911414a6295STrond Myklebust return 0; 912414a6295STrond Myklebust if (!kref_get_unless_zero(&gss_pipe->kref)) 913414a6295STrond Myklebust return 0; 914414a6295STrond Myklebust return 1; 915414a6295STrond Myklebust } 916414a6295STrond Myklebust 917414a6295STrond Myklebust static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) 918414a6295STrond Myklebust { 919414a6295STrond Myklebust struct gss_pipe *gss_pipe; 920414a6295STrond Myklebust struct gss_alloc_pdo *args = data; 921414a6295STrond Myklebust 922414a6295STrond Myklebust gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); 923414a6295STrond Myklebust if (!IS_ERR(gss_pipe)) 924414a6295STrond Myklebust return &gss_pipe->pdo; 925414a6295STrond Myklebust return NULL; 926414a6295STrond Myklebust } 927414a6295STrond Myklebust 928414a6295STrond Myklebust static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, 929414a6295STrond Myklebust const char *name, 930414a6295STrond Myklebust const struct rpc_pipe_ops *upcall_ops) 931414a6295STrond Myklebust { 932414a6295STrond Myklebust struct net *net = rpc_net_ns(clnt); 933414a6295STrond Myklebust struct rpc_pipe_dir_object *pdo; 934414a6295STrond Myklebust struct gss_alloc_pdo args = { 935414a6295STrond Myklebust .clnt = clnt, 936414a6295STrond Myklebust .name = name, 937414a6295STrond Myklebust .upcall_ops = upcall_ops, 938414a6295STrond Myklebust }; 939414a6295STrond Myklebust 940414a6295STrond Myklebust pdo = rpc_find_or_alloc_pipe_dir_object(net, 941414a6295STrond Myklebust &clnt->cl_pipedir_objects, 942414a6295STrond Myklebust gss_pipe_match_pdo, 943414a6295STrond Myklebust gss_pipe_alloc_pdo, 944414a6295STrond Myklebust &args); 945414a6295STrond Myklebust if (pdo != NULL) 946414a6295STrond Myklebust return container_of(pdo, struct gss_pipe, pdo); 947414a6295STrond Myklebust return ERR_PTR(-ENOMEM); 948414a6295STrond Myklebust } 949414a6295STrond Myklebust 95019172284STrond Myklebust static void __gss_pipe_free(struct gss_pipe *p) 951ccdc28f8SStanislav Kinsbursky { 95219172284STrond Myklebust struct rpc_clnt *clnt = p->clnt; 95319172284STrond Myklebust struct net *net = rpc_net_ns(clnt); 954ccdc28f8SStanislav Kinsbursky 95519172284STrond Myklebust rpc_remove_pipe_dir_object(net, 95619172284STrond Myklebust &clnt->cl_pipedir_objects, 95719172284STrond Myklebust &p->pdo); 95819172284STrond Myklebust rpc_destroy_pipe_data(p->pipe); 95919172284STrond Myklebust kfree(p); 960ccdc28f8SStanislav Kinsbursky } 961ccdc28f8SStanislav Kinsbursky 962414a6295STrond Myklebust static void __gss_pipe_release(struct kref *kref) 963414a6295STrond Myklebust { 964414a6295STrond Myklebust struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); 965414a6295STrond Myklebust 966414a6295STrond Myklebust __gss_pipe_free(p); 967414a6295STrond Myklebust } 968414a6295STrond Myklebust 96919172284STrond Myklebust static void gss_pipe_free(struct gss_pipe *p) 970ccdc28f8SStanislav Kinsbursky { 97119172284STrond Myklebust if (p != NULL) 972414a6295STrond Myklebust kref_put(&p->kref, __gss_pipe_release); 973ccdc28f8SStanislav Kinsbursky } 974ccdc28f8SStanislav Kinsbursky 9751da177e4SLinus Torvalds /* 9761da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 9771da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 9781da177e4SLinus Torvalds */ 979eb6dc19dSTrond Myklebust static struct gss_auth * 980eb6dc19dSTrond Myklebust gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 9811da177e4SLinus Torvalds { 982c2190661STrond Myklebust rpc_authflavor_t flavor = args->pseudoflavor; 9831da177e4SLinus Torvalds struct gss_auth *gss_auth; 98419172284STrond Myklebust struct gss_pipe *gss_pipe; 9851da177e4SLinus Torvalds struct rpc_auth * auth; 9866a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 9916a19275aSJ. Bruce Fields return ERR_PTR(err); 9921da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 9931da177e4SLinus Torvalds goto out_dec; 994eb6dc19dSTrond Myklebust INIT_HLIST_NODE(&gss_auth->hash); 995bd4a3eb1STrond Myklebust gss_auth->target_name = NULL; 996c2190661STrond Myklebust if (args->target_name) { 997c2190661STrond Myklebust gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); 998bd4a3eb1STrond Myklebust if (gss_auth->target_name == NULL) 999bd4a3eb1STrond Myklebust goto err_free; 1000bd4a3eb1STrond Myklebust } 10011da177e4SLinus Torvalds gss_auth->client = clnt; 1002e726340aSTrond Myklebust gss_auth->net = get_net(rpc_net_ns(clnt)); 10036a19275aSJ. Bruce Fields err = -EINVAL; 10041da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 10051da177e4SLinus Torvalds if (!gss_auth->mech) { 10069b1d75b7STrond Myklebust dprintk("RPC: Pseudoflavor %d not found!\n", flavor); 1007e726340aSTrond Myklebust goto err_put_net; 10081da177e4SLinus Torvalds } 10091da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 1010438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 1011438b6fdeSJ. Bruce Fields goto err_put_mech; 1012a699d65eSTrond Myklebust if (!gssd_running(gss_auth->net)) 1013a699d65eSTrond Myklebust goto err_put_mech; 10141da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 10151da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 10161da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 10171da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 10181da177e4SLinus Torvalds auth->au_flavor = flavor; 10191da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 10200285ed1fSTrond Myklebust kref_init(&gss_auth->kref); 10211da177e4SLinus Torvalds 102219172284STrond Myklebust err = rpcauth_init_credcache(auth); 102319172284STrond Myklebust if (err) 102419172284STrond Myklebust goto err_put_mech; 102534769fc4S\"J. Bruce Fields\ /* 102634769fc4S\"J. Bruce Fields\ * Note: if we created the old pipe first, then someone who 102734769fc4S\"J. Bruce Fields\ * examined the directory at the right moment might conclude 102834769fc4S\"J. Bruce Fields\ * that we supported only the old pipe. So we instead create 102934769fc4S\"J. Bruce Fields\ * the new pipe first. 103034769fc4S\"J. Bruce Fields\ */ 1031414a6295STrond Myklebust gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); 103219172284STrond Myklebust if (IS_ERR(gss_pipe)) { 103319172284STrond Myklebust err = PTR_ERR(gss_pipe); 103419172284STrond Myklebust goto err_destroy_credcache; 10356a19275aSJ. Bruce Fields } 103619172284STrond Myklebust gss_auth->gss_pipe[1] = gss_pipe; 10371da177e4SLinus Torvalds 1038414a6295STrond Myklebust gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, 103919172284STrond Myklebust &gss_upcall_ops_v0); 104019172284STrond Myklebust if (IS_ERR(gss_pipe)) { 104119172284STrond Myklebust err = PTR_ERR(gss_pipe); 1042c239d83bSStanislav Kinsbursky goto err_destroy_pipe_1; 1043c239d83bSStanislav Kinsbursky } 104419172284STrond Myklebust gss_auth->gss_pipe[0] = gss_pipe; 104507a2bf1dSTrond Myklebust 1046eb6dc19dSTrond Myklebust return gss_auth; 1047c239d83bSStanislav Kinsbursky err_destroy_pipe_1: 1048414a6295STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 104919172284STrond Myklebust err_destroy_credcache: 105019172284STrond Myklebust rpcauth_destroy_credcache(auth); 10511da177e4SLinus Torvalds err_put_mech: 10521da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 1053e726340aSTrond Myklebust err_put_net: 1054e726340aSTrond Myklebust put_net(gss_auth->net); 10551da177e4SLinus Torvalds err_free: 1056bd4a3eb1STrond Myklebust kfree(gss_auth->target_name); 10571da177e4SLinus Torvalds kfree(gss_auth); 10581da177e4SLinus Torvalds out_dec: 10591da177e4SLinus Torvalds module_put(THIS_MODULE); 10606a19275aSJ. Bruce Fields return ERR_PTR(err); 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 10631da177e4SLinus Torvalds static void 10640285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 10650285ed1fSTrond Myklebust { 106619172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[0]); 106719172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 10680285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 1069e726340aSTrond Myklebust put_net(gss_auth->net); 1070bd4a3eb1STrond Myklebust kfree(gss_auth->target_name); 10710285ed1fSTrond Myklebust 10720285ed1fSTrond Myklebust kfree(gss_auth); 10730285ed1fSTrond Myklebust module_put(THIS_MODULE); 10740285ed1fSTrond Myklebust } 10750285ed1fSTrond Myklebust 10760285ed1fSTrond Myklebust static void 10770285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 10780285ed1fSTrond Myklebust { 10790285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 10800285ed1fSTrond Myklebust 10810285ed1fSTrond Myklebust gss_free(gss_auth); 10820285ed1fSTrond Myklebust } 10830285ed1fSTrond Myklebust 10840285ed1fSTrond Myklebust static void 10859eb2ddb4STrond Myklebust gss_put_auth(struct gss_auth *gss_auth) 10869eb2ddb4STrond Myklebust { 10879eb2ddb4STrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 10889eb2ddb4STrond Myklebust } 10899eb2ddb4STrond Myklebust 10909eb2ddb4STrond Myklebust static void 10911da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 10921da177e4SLinus Torvalds { 109319172284STrond Myklebust struct gss_auth *gss_auth = container_of(auth, 109419172284STrond Myklebust struct gss_auth, rpc_auth); 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 10971da177e4SLinus Torvalds auth, auth->au_flavor); 10981da177e4SLinus Torvalds 1099eb6dc19dSTrond Myklebust if (hash_hashed(&gss_auth->hash)) { 1100eb6dc19dSTrond Myklebust spin_lock(&gss_auth_hash_lock); 1101eb6dc19dSTrond Myklebust hash_del(&gss_auth->hash); 1102eb6dc19dSTrond Myklebust spin_unlock(&gss_auth_hash_lock); 1103eb6dc19dSTrond Myklebust } 1104eb6dc19dSTrond Myklebust 110519172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[0]); 110619172284STrond Myklebust gss_auth->gss_pipe[0] = NULL; 110719172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 110819172284STrond Myklebust gss_auth->gss_pipe[1] = NULL; 11093ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 11103ab9bb72STrond Myklebust 11119eb2ddb4STrond Myklebust gss_put_auth(gss_auth); 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds 1114a0f6ed8eSJ. Bruce Fields /* 1115a0f6ed8eSJ. Bruce Fields * Auths may be shared between rpc clients that were cloned from a 1116a0f6ed8eSJ. Bruce Fields * common client with the same xprt, if they also share the flavor and 1117a0f6ed8eSJ. Bruce Fields * target_name. 1118a0f6ed8eSJ. Bruce Fields * 1119a0f6ed8eSJ. Bruce Fields * The auth is looked up from the oldest parent sharing the same 1120a0f6ed8eSJ. Bruce Fields * cl_xprt, and the auth itself references only that common parent 1121a0f6ed8eSJ. Bruce Fields * (which is guaranteed to last as long as any of its descendants). 1122a0f6ed8eSJ. Bruce Fields */ 1123eb6dc19dSTrond Myklebust static struct gss_auth * 1124eb6dc19dSTrond Myklebust gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args, 1125eb6dc19dSTrond Myklebust struct rpc_clnt *clnt, 1126eb6dc19dSTrond Myklebust struct gss_auth *new) 1127eb6dc19dSTrond Myklebust { 1128eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1129eb6dc19dSTrond Myklebust unsigned long hashval = (unsigned long)clnt; 1130eb6dc19dSTrond Myklebust 1131eb6dc19dSTrond Myklebust spin_lock(&gss_auth_hash_lock); 1132eb6dc19dSTrond Myklebust hash_for_each_possible(gss_auth_hash_table, 1133eb6dc19dSTrond Myklebust gss_auth, 1134eb6dc19dSTrond Myklebust hash, 1135eb6dc19dSTrond Myklebust hashval) { 1136a0f6ed8eSJ. Bruce Fields if (gss_auth->client != clnt) 1137a0f6ed8eSJ. Bruce Fields continue; 1138eb6dc19dSTrond Myklebust if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) 1139eb6dc19dSTrond Myklebust continue; 1140eb6dc19dSTrond Myklebust if (gss_auth->target_name != args->target_name) { 1141eb6dc19dSTrond Myklebust if (gss_auth->target_name == NULL) 1142eb6dc19dSTrond Myklebust continue; 1143eb6dc19dSTrond Myklebust if (args->target_name == NULL) 1144eb6dc19dSTrond Myklebust continue; 1145eb6dc19dSTrond Myklebust if (strcmp(gss_auth->target_name, args->target_name)) 1146eb6dc19dSTrond Myklebust continue; 1147eb6dc19dSTrond Myklebust } 1148eb6dc19dSTrond Myklebust if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count)) 1149eb6dc19dSTrond Myklebust continue; 1150eb6dc19dSTrond Myklebust goto out; 1151eb6dc19dSTrond Myklebust } 1152eb6dc19dSTrond Myklebust if (new) 1153eb6dc19dSTrond Myklebust hash_add(gss_auth_hash_table, &new->hash, hashval); 1154eb6dc19dSTrond Myklebust gss_auth = new; 1155eb6dc19dSTrond Myklebust out: 1156eb6dc19dSTrond Myklebust spin_unlock(&gss_auth_hash_lock); 1157eb6dc19dSTrond Myklebust return gss_auth; 1158eb6dc19dSTrond Myklebust } 1159eb6dc19dSTrond Myklebust 1160eb6dc19dSTrond Myklebust static struct gss_auth * 1161eb6dc19dSTrond Myklebust gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 1162eb6dc19dSTrond Myklebust { 1163eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1164eb6dc19dSTrond Myklebust struct gss_auth *new; 1165eb6dc19dSTrond Myklebust 1166eb6dc19dSTrond Myklebust gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); 1167eb6dc19dSTrond Myklebust if (gss_auth != NULL) 1168eb6dc19dSTrond Myklebust goto out; 1169eb6dc19dSTrond Myklebust new = gss_create_new(args, clnt); 1170eb6dc19dSTrond Myklebust if (IS_ERR(new)) 1171eb6dc19dSTrond Myklebust return new; 1172eb6dc19dSTrond Myklebust gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); 1173eb6dc19dSTrond Myklebust if (gss_auth != new) 1174eb6dc19dSTrond Myklebust gss_destroy(&new->rpc_auth); 1175eb6dc19dSTrond Myklebust out: 1176eb6dc19dSTrond Myklebust return gss_auth; 1177eb6dc19dSTrond Myklebust } 1178eb6dc19dSTrond Myklebust 1179eb6dc19dSTrond Myklebust static struct rpc_auth * 1180eb6dc19dSTrond Myklebust gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 1181eb6dc19dSTrond Myklebust { 1182eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1183eb6dc19dSTrond Myklebust struct rpc_xprt *xprt = rcu_access_pointer(clnt->cl_xprt); 1184eb6dc19dSTrond Myklebust 1185eb6dc19dSTrond Myklebust while (clnt != clnt->cl_parent) { 1186eb6dc19dSTrond Myklebust struct rpc_clnt *parent = clnt->cl_parent; 1187eb6dc19dSTrond Myklebust /* Find the original parent for this transport */ 1188eb6dc19dSTrond Myklebust if (rcu_access_pointer(parent->cl_xprt) != xprt) 1189eb6dc19dSTrond Myklebust break; 1190eb6dc19dSTrond Myklebust clnt = parent; 1191eb6dc19dSTrond Myklebust } 1192eb6dc19dSTrond Myklebust 1193eb6dc19dSTrond Myklebust gss_auth = gss_create_hashed(args, clnt); 1194eb6dc19dSTrond Myklebust if (IS_ERR(gss_auth)) 1195eb6dc19dSTrond Myklebust return ERR_CAST(gss_auth); 1196eb6dc19dSTrond Myklebust return &gss_auth->rpc_auth; 1197eb6dc19dSTrond Myklebust } 1198eb6dc19dSTrond Myklebust 11990df7fb74STrond Myklebust /* 12000df7fb74STrond Myklebust * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 12010df7fb74STrond Myklebust * to the server with the GSS control procedure field set to 12020df7fb74STrond Myklebust * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 12030df7fb74STrond Myklebust * all RPCSEC_GSS state associated with that context. 12040df7fb74STrond Myklebust */ 12050df7fb74STrond Myklebust static int 12060df7fb74STrond Myklebust gss_destroying_context(struct rpc_cred *cred) 12070df7fb74STrond Myklebust { 12080df7fb74STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 12090df7fb74STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 12100df7fb74STrond Myklebust struct rpc_task *task; 12110df7fb74STrond Myklebust 12120df7fb74STrond Myklebust if (gss_cred->gc_ctx == NULL || 12136dcd3926SJeff Layton test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 12140df7fb74STrond Myklebust return 0; 12150df7fb74STrond Myklebust 12160df7fb74STrond Myklebust gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 12170df7fb74STrond Myklebust cred->cr_ops = &gss_nullops; 12180df7fb74STrond Myklebust 12190df7fb74STrond Myklebust /* Take a reference to ensure the cred will be destroyed either 12200df7fb74STrond Myklebust * by the RPC call or by the put_rpccred() below */ 12210df7fb74STrond Myklebust get_rpccred(cred); 12220df7fb74STrond Myklebust 1223080a1f14STrond Myklebust task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 12240df7fb74STrond Myklebust if (!IS_ERR(task)) 12250df7fb74STrond Myklebust rpc_put_task(task); 12260df7fb74STrond Myklebust 12270df7fb74STrond Myklebust put_rpccred(cred); 12280df7fb74STrond Myklebust return 1; 12290df7fb74STrond Myklebust } 12300df7fb74STrond Myklebust 12310df7fb74STrond Myklebust /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 12321da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 12331da177e4SLinus Torvalds * allocated before freeing them. */ 12341da177e4SLinus Torvalds static void 12355d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 12361da177e4SLinus Torvalds { 1237632f0d05SChuck Lever dprintk("RPC: %s\n", __func__); 12381da177e4SLinus Torvalds 12390d8a3746STrond Myklebust gss_delete_sec_context(&ctx->gc_gss_ctx); 12401da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 12412004c726SJeff Layton kfree(ctx->gc_acceptor.data); 12421da177e4SLinus Torvalds kfree(ctx); 12431da177e4SLinus Torvalds } 12441da177e4SLinus Torvalds 12451da177e4SLinus Torvalds static void 12465d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 12475d28dc82STrond Myklebust { 12485d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 12495d28dc82STrond Myklebust gss_do_free_ctx(ctx); 12505d28dc82STrond Myklebust } 12515d28dc82STrond Myklebust 12525d28dc82STrond Myklebust static void 12535d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 12545d28dc82STrond Myklebust { 12555d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 12565d28dc82STrond Myklebust } 12575d28dc82STrond Myklebust 12585d28dc82STrond Myklebust static void 125931be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 12601da177e4SLinus Torvalds { 1261632f0d05SChuck Lever dprintk("RPC: %s cred=%p\n", __func__, gss_cred); 126231be5bf1STrond Myklebust kfree(gss_cred); 126331be5bf1STrond Myklebust } 12641da177e4SLinus Torvalds 126531be5bf1STrond Myklebust static void 126631be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 126731be5bf1STrond Myklebust { 126831be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 126931be5bf1STrond Myklebust gss_free_cred(gss_cred); 127031be5bf1STrond Myklebust } 12711da177e4SLinus Torvalds 127231be5bf1STrond Myklebust static void 12736dcd3926SJeff Layton gss_destroy_nullcred(struct rpc_cred *cred) 127431be5bf1STrond Myklebust { 12755d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 12760285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 12775d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 12785d28dc82STrond Myklebust 1279a9b3cd7fSStephen Hemminger RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); 128031be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 12815d28dc82STrond Myklebust if (ctx) 12825d28dc82STrond Myklebust gss_put_ctx(ctx); 12839eb2ddb4STrond Myklebust gss_put_auth(gss_auth); 12841da177e4SLinus Torvalds } 12851da177e4SLinus Torvalds 12866dcd3926SJeff Layton static void 12876dcd3926SJeff Layton gss_destroy_cred(struct rpc_cred *cred) 12886dcd3926SJeff Layton { 12896dcd3926SJeff Layton 12906dcd3926SJeff Layton if (gss_destroying_context(cred)) 12916dcd3926SJeff Layton return; 12926dcd3926SJeff Layton gss_destroy_nullcred(cred); 12936dcd3926SJeff Layton } 12946dcd3926SJeff Layton 12951da177e4SLinus Torvalds /* 12961da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 12971da177e4SLinus Torvalds */ 12981da177e4SLinus Torvalds static struct rpc_cred * 12998a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 13001da177e4SLinus Torvalds { 13018a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 13021da177e4SLinus Torvalds } 13031da177e4SLinus Torvalds 13041da177e4SLinus Torvalds static struct rpc_cred * 13058a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 13061da177e4SLinus Torvalds { 13071da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 13081da177e4SLinus Torvalds struct gss_cred *cred = NULL; 13091da177e4SLinus Torvalds int err = -ENOMEM; 13101da177e4SLinus Torvalds 1311632f0d05SChuck Lever dprintk("RPC: %s for uid %d, flavor %d\n", 1312cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, acred->uid), 1313cdba321eSEric W. Biederman auth->au_flavor); 13141da177e4SLinus Torvalds 13150f38b873STrond Myklebust if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 13161da177e4SLinus Torvalds goto out_err; 13171da177e4SLinus Torvalds 13185fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 13191da177e4SLinus Torvalds /* 13201da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 13211da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 13221da177e4SLinus Torvalds */ 1323fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 13241da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 132568c97153STrond Myklebust cred->gc_principal = NULL; 132668c97153STrond Myklebust if (acred->machine_cred) 132768c97153STrond Myklebust cred->gc_principal = acred->principal; 13280285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 13291da177e4SLinus Torvalds return &cred->gc_base; 13301da177e4SLinus Torvalds 13311da177e4SLinus Torvalds out_err: 1332632f0d05SChuck Lever dprintk("RPC: %s failed with error %d\n", __func__, err); 13331da177e4SLinus Torvalds return ERR_PTR(err); 13341da177e4SLinus Torvalds } 13351da177e4SLinus Torvalds 13361da177e4SLinus Torvalds static int 1337fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 1338fba3bad4STrond Myklebust { 1339fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 1340fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 1341fba3bad4STrond Myklebust int err; 1342fba3bad4STrond Myklebust 1343fba3bad4STrond Myklebust do { 1344fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 1345fba3bad4STrond Myklebust } while (err == -EAGAIN); 1346fba3bad4STrond Myklebust return err; 1347fba3bad4STrond Myklebust } 1348fba3bad4STrond Myklebust 13494de6caa2SAndy Adamson /* 13504de6caa2SAndy Adamson * Returns -EACCES if GSS context is NULL or will expire within the 13514de6caa2SAndy Adamson * timeout (miliseconds) 13524de6caa2SAndy Adamson */ 13534de6caa2SAndy Adamson static int 13544de6caa2SAndy Adamson gss_key_timeout(struct rpc_cred *rc) 13554de6caa2SAndy Adamson { 13564de6caa2SAndy Adamson struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 13574de6caa2SAndy Adamson unsigned long now = jiffies; 13584de6caa2SAndy Adamson unsigned long expire; 13594de6caa2SAndy Adamson 13604de6caa2SAndy Adamson if (gss_cred->gc_ctx == NULL) 13614de6caa2SAndy Adamson return -EACCES; 13624de6caa2SAndy Adamson 13634de6caa2SAndy Adamson expire = gss_cred->gc_ctx->gc_expiry - (gss_key_expire_timeo * HZ); 13644de6caa2SAndy Adamson 13654de6caa2SAndy Adamson if (time_after(now, expire)) 13664de6caa2SAndy Adamson return -EACCES; 13674de6caa2SAndy Adamson return 0; 13684de6caa2SAndy Adamson } 13694de6caa2SAndy Adamson 1370fba3bad4STrond Myklebust static int 13718a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 13721da177e4SLinus Torvalds { 13731da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 13744de6caa2SAndy Adamson int ret; 13751da177e4SLinus Torvalds 1376cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 13778a317760STrond Myklebust goto out; 13781da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 1379cd019f75STrond Myklebust if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 1380cd019f75STrond Myklebust return 0; 1381cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 13821da177e4SLinus Torvalds return 0; 13838a317760STrond Myklebust out: 138468c97153STrond Myklebust if (acred->principal != NULL) { 138568c97153STrond Myklebust if (gss_cred->gc_principal == NULL) 138668c97153STrond Myklebust return 0; 13874de6caa2SAndy Adamson ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; 13884de6caa2SAndy Adamson goto check_expire; 138968c97153STrond Myklebust } 139068c97153STrond Myklebust if (gss_cred->gc_principal != NULL) 13917c67db3aSTrond Myklebust return 0; 13924de6caa2SAndy Adamson ret = uid_eq(rc->cr_uid, acred->uid); 13934de6caa2SAndy Adamson 13944de6caa2SAndy Adamson check_expire: 13954de6caa2SAndy Adamson if (ret == 0) 13964de6caa2SAndy Adamson return ret; 13974de6caa2SAndy Adamson 13984de6caa2SAndy Adamson /* Notify acred users of GSS context expiration timeout */ 13994de6caa2SAndy Adamson if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) && 14004de6caa2SAndy Adamson (gss_key_timeout(rc) != 0)) { 14014de6caa2SAndy Adamson /* test will now be done from generic cred */ 14024de6caa2SAndy Adamson test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags); 14034de6caa2SAndy Adamson /* tell NFS layer that key will expire soon */ 14044de6caa2SAndy Adamson set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags); 14054de6caa2SAndy Adamson } 14064de6caa2SAndy Adamson return ret; 14071da177e4SLinus Torvalds } 14081da177e4SLinus Torvalds 14091da177e4SLinus Torvalds /* 14101da177e4SLinus Torvalds * Marshal credentials. 14111da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 14121da177e4SLinus Torvalds */ 1413d8ed029dSAlexey Dobriyan static __be32 * 1414d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 14151da177e4SLinus Torvalds { 1416a17c2153STrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 1417a17c2153STrond Myklebust struct rpc_cred *cred = req->rq_cred; 14181da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 14191da177e4SLinus Torvalds gc_base); 14201da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1421d8ed029dSAlexey Dobriyan __be32 *cred_len; 14221da177e4SLinus Torvalds u32 maj_stat = 0; 14231da177e4SLinus Torvalds struct xdr_netobj mic; 14241da177e4SLinus Torvalds struct kvec iov; 14251da177e4SLinus Torvalds struct xdr_buf verf_buf; 14261da177e4SLinus Torvalds 1427632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 14281da177e4SLinus Torvalds 14291da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 14301da177e4SLinus Torvalds cred_len = p++; 14311da177e4SLinus Torvalds 14321da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 14331da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 14341da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 14371da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 14381da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 14391da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 14401da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 14411da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 14421da177e4SLinus Torvalds 14431da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 14441da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 1445a4f0835cSTrond Myklebust iov.iov_base = xprt_skip_transport_header(req->rq_xprt, 1446808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 14471da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 14481da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 14491da177e4SLinus Torvalds 14501da177e4SLinus Torvalds /* set verifier flavor*/ 14511da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 14521da177e4SLinus Torvalds 14531da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 145400fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 14551da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 1456fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 14571da177e4SLinus Torvalds } else if (maj_stat != 0) { 14581da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 14591da177e4SLinus Torvalds goto out_put_ctx; 14601da177e4SLinus Torvalds } 14611da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 14621da177e4SLinus Torvalds gss_put_ctx(ctx); 14631da177e4SLinus Torvalds return p; 14641da177e4SLinus Torvalds out_put_ctx: 14651da177e4SLinus Torvalds gss_put_ctx(ctx); 14661da177e4SLinus Torvalds return NULL; 14671da177e4SLinus Torvalds } 14681da177e4SLinus Torvalds 1469cd019f75STrond Myklebust static int gss_renew_cred(struct rpc_task *task) 1470cd019f75STrond Myklebust { 1471a17c2153STrond Myklebust struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; 1472cd019f75STrond Myklebust struct gss_cred *gss_cred = container_of(oldcred, 1473cd019f75STrond Myklebust struct gss_cred, 1474cd019f75STrond Myklebust gc_base); 1475cd019f75STrond Myklebust struct rpc_auth *auth = oldcred->cr_auth; 1476cd019f75STrond Myklebust struct auth_cred acred = { 1477cd019f75STrond Myklebust .uid = oldcred->cr_uid, 147868c97153STrond Myklebust .principal = gss_cred->gc_principal, 147968c97153STrond Myklebust .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), 1480cd019f75STrond Myklebust }; 1481cd019f75STrond Myklebust struct rpc_cred *new; 1482cd019f75STrond Myklebust 1483cd019f75STrond Myklebust new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 1484cd019f75STrond Myklebust if (IS_ERR(new)) 1485cd019f75STrond Myklebust return PTR_ERR(new); 1486a17c2153STrond Myklebust task->tk_rqstp->rq_cred = new; 1487cd019f75STrond Myklebust put_rpccred(oldcred); 1488cd019f75STrond Myklebust return 0; 1489cd019f75STrond Myklebust } 1490cd019f75STrond Myklebust 1491126e216aSTrond Myklebust static int gss_cred_is_negative_entry(struct rpc_cred *cred) 1492126e216aSTrond Myklebust { 1493126e216aSTrond Myklebust if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { 1494126e216aSTrond Myklebust unsigned long now = jiffies; 1495126e216aSTrond Myklebust unsigned long begin, expire; 1496126e216aSTrond Myklebust struct gss_cred *gss_cred; 1497126e216aSTrond Myklebust 1498126e216aSTrond Myklebust gss_cred = container_of(cred, struct gss_cred, gc_base); 1499126e216aSTrond Myklebust begin = gss_cred->gc_upcall_timestamp; 1500126e216aSTrond Myklebust expire = begin + gss_expired_cred_retry_delay * HZ; 1501126e216aSTrond Myklebust 1502126e216aSTrond Myklebust if (time_in_range_open(now, begin, expire)) 1503126e216aSTrond Myklebust return 1; 1504126e216aSTrond Myklebust } 1505126e216aSTrond Myklebust return 0; 1506126e216aSTrond Myklebust } 1507126e216aSTrond Myklebust 15081da177e4SLinus Torvalds /* 15091da177e4SLinus Torvalds * Refresh credentials. XXX - finish 15101da177e4SLinus Torvalds */ 15111da177e4SLinus Torvalds static int 15121da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 15131da177e4SLinus Torvalds { 1514a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 1515cd019f75STrond Myklebust int ret = 0; 15161da177e4SLinus Torvalds 1517126e216aSTrond Myklebust if (gss_cred_is_negative_entry(cred)) 1518126e216aSTrond Myklebust return -EKEYEXPIRED; 1519126e216aSTrond Myklebust 1520cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 1521cd019f75STrond Myklebust !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 1522cd019f75STrond Myklebust ret = gss_renew_cred(task); 1523cd019f75STrond Myklebust if (ret < 0) 1524cd019f75STrond Myklebust goto out; 1525a17c2153STrond Myklebust cred = task->tk_rqstp->rq_cred; 1526cd019f75STrond Myklebust } 1527cd019f75STrond Myklebust 1528cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 1529cd019f75STrond Myklebust ret = gss_refresh_upcall(task); 1530cd019f75STrond Myklebust out: 1531cd019f75STrond Myklebust return ret; 15321da177e4SLinus Torvalds } 15331da177e4SLinus Torvalds 15340df7fb74STrond Myklebust /* Dummy refresh routine: used only when destroying the context */ 15350df7fb74STrond Myklebust static int 15360df7fb74STrond Myklebust gss_refresh_null(struct rpc_task *task) 15370df7fb74STrond Myklebust { 1538c297c8b9SAndy Adamson return 0; 15390df7fb74STrond Myklebust } 15400df7fb74STrond Myklebust 1541d8ed029dSAlexey Dobriyan static __be32 * 1542d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 15431da177e4SLinus Torvalds { 1544a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 15451da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1546d8ed029dSAlexey Dobriyan __be32 seq; 15471da177e4SLinus Torvalds struct kvec iov; 15481da177e4SLinus Torvalds struct xdr_buf verf_buf; 15491da177e4SLinus Torvalds struct xdr_netobj mic; 15501da177e4SLinus Torvalds u32 flav,len; 15511da177e4SLinus Torvalds u32 maj_stat; 155235fa5f7bSAndy Adamson __be32 *ret = ERR_PTR(-EIO); 15531da177e4SLinus Torvalds 1554632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 15551da177e4SLinus Torvalds 15561da177e4SLinus Torvalds flav = ntohl(*p++); 15571da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 15581da177e4SLinus Torvalds goto out_bad; 15591da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 15601da177e4SLinus Torvalds goto out_bad; 15611da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 15621da177e4SLinus Torvalds iov.iov_base = &seq; 15631da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 15641da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 15651da177e4SLinus Torvalds mic.data = (u8 *)p; 15661da177e4SLinus Torvalds mic.len = len; 15671da177e4SLinus Torvalds 156835fa5f7bSAndy Adamson ret = ERR_PTR(-EACCES); 156900fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 15701da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1571fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 15720df7fb74STrond Myklebust if (maj_stat) { 1573632f0d05SChuck Lever dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", 1574632f0d05SChuck Lever task->tk_pid, __func__, maj_stat); 15751da177e4SLinus Torvalds goto out_bad; 15760df7fb74STrond Myklebust } 157724b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 157824b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 15791be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 15801da177e4SLinus Torvalds gss_put_ctx(ctx); 1581632f0d05SChuck Lever dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", 1582632f0d05SChuck Lever task->tk_pid, __func__); 15831da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 15841da177e4SLinus Torvalds out_bad: 15851da177e4SLinus Torvalds gss_put_ctx(ctx); 158635fa5f7bSAndy Adamson dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, 158735fa5f7bSAndy Adamson PTR_ERR(ret)); 158835fa5f7bSAndy Adamson return ret; 15891da177e4SLinus Torvalds } 15901da177e4SLinus Torvalds 15919f06c719SChuck Lever static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, 15929f06c719SChuck Lever __be32 *p, void *obj) 15939f06c719SChuck Lever { 15949f06c719SChuck Lever struct xdr_stream xdr; 15959f06c719SChuck Lever 15969f06c719SChuck Lever xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); 15979f06c719SChuck Lever encode(rqstp, &xdr, obj); 15989f06c719SChuck Lever } 15999f06c719SChuck Lever 16001da177e4SLinus Torvalds static inline int 16011da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 16029f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 16039f06c719SChuck Lever __be32 *p, void *obj) 16041da177e4SLinus Torvalds { 16051da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 16061da177e4SLinus Torvalds struct xdr_buf integ_buf; 1607d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 16081da177e4SLinus Torvalds struct xdr_netobj mic; 1609d8ed029dSAlexey Dobriyan u32 offset; 1610d8ed029dSAlexey Dobriyan __be32 *q; 16111da177e4SLinus Torvalds struct kvec *iov; 16121da177e4SLinus Torvalds u32 maj_stat = 0; 16131da177e4SLinus Torvalds int status = -EIO; 16141da177e4SLinus Torvalds 16151da177e4SLinus Torvalds integ_len = p++; 16161da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 16171da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 16181da177e4SLinus Torvalds 16199f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 16221da177e4SLinus Torvalds offset, snd_buf->len - offset)) 16231da177e4SLinus Torvalds return status; 16241da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 16251da177e4SLinus Torvalds 16261da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 16271da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 16281da177e4SLinus Torvalds iov = snd_buf->tail; 16291da177e4SLinus Torvalds else 16301da177e4SLinus Torvalds iov = snd_buf->head; 16311da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 16321da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 16331da177e4SLinus Torvalds 163400fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 16351da177e4SLinus Torvalds status = -EIO; /* XXX? */ 16361da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1637fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 16381da177e4SLinus Torvalds else if (maj_stat) 16391da177e4SLinus Torvalds return status; 16401da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 16411da177e4SLinus Torvalds 16421da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 16431da177e4SLinus Torvalds iov->iov_len += offset; 16441da177e4SLinus Torvalds snd_buf->len += offset; 16451da177e4SLinus Torvalds return 0; 16461da177e4SLinus Torvalds } 16471da177e4SLinus Torvalds 16482d2da60cSJ. Bruce Fields static void 16492d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 16502d2da60cSJ. Bruce Fields { 16512d2da60cSJ. Bruce Fields int i; 16522d2da60cSJ. Bruce Fields 16532d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 16542d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 16552d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 16562d2da60cSJ. Bruce Fields } 16572d2da60cSJ. Bruce Fields 16582d2da60cSJ. Bruce Fields static int 16592d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 16602d2da60cSJ. Bruce Fields { 16612d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 16622d2da60cSJ. Bruce Fields int first, last, i; 16632d2da60cSJ. Bruce Fields 16642d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 16652d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 16662d2da60cSJ. Bruce Fields return 0; 16672d2da60cSJ. Bruce Fields } 16682d2da60cSJ. Bruce Fields 16692d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 16702d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 16712d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 16722d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 16732d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 16742d2da60cSJ. Bruce Fields GFP_NOFS); 16752d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 16762d2da60cSJ. Bruce Fields goto out; 16772d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 16782d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 16792d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 16802d2da60cSJ. Bruce Fields goto out_free; 16812d2da60cSJ. Bruce Fields } 16822d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 16832d2da60cSJ. Bruce Fields return 0; 16842d2da60cSJ. Bruce Fields out_free: 1685cdead7cfSTrond Myklebust rqstp->rq_enc_pages_num = i; 1686cdead7cfSTrond Myklebust priv_release_snd_buf(rqstp); 16872d2da60cSJ. Bruce Fields out: 16882d2da60cSJ. Bruce Fields return -EAGAIN; 16892d2da60cSJ. Bruce Fields } 16902d2da60cSJ. Bruce Fields 16912d2da60cSJ. Bruce Fields static inline int 16922d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 16939f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 16949f06c719SChuck Lever __be32 *p, void *obj) 16952d2da60cSJ. Bruce Fields { 16962d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 16972d2da60cSJ. Bruce Fields u32 offset; 16982d2da60cSJ. Bruce Fields u32 maj_stat; 16992d2da60cSJ. Bruce Fields int status; 1700d8ed029dSAlexey Dobriyan __be32 *opaque_len; 17012d2da60cSJ. Bruce Fields struct page **inpages; 17022d2da60cSJ. Bruce Fields int first; 17032d2da60cSJ. Bruce Fields int pad; 17042d2da60cSJ. Bruce Fields struct kvec *iov; 17052d2da60cSJ. Bruce Fields char *tmp; 17062d2da60cSJ. Bruce Fields 17072d2da60cSJ. Bruce Fields opaque_len = p++; 17082d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 17092d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 17102d2da60cSJ. Bruce Fields 17119f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 17122d2da60cSJ. Bruce Fields 17132d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 17142d2da60cSJ. Bruce Fields if (status) 17152d2da60cSJ. Bruce Fields return status; 17162d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 17172d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 17182d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 17192d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 17207561042fSKevin Coffman /* 17217561042fSKevin Coffman * Give the tail its own page, in case we need extra space in the 17227561042fSKevin Coffman * head when wrapping: 17237561042fSKevin Coffman * 17247561042fSKevin Coffman * call_allocate() allocates twice the slack space required 17257561042fSKevin Coffman * by the authentication flavor to rq_callsize. 17267561042fSKevin Coffman * For GSS, slack is GSS_CRED_SLACK. 17277561042fSKevin Coffman */ 17282d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 17292d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 17302d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 17312d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 17322d2da60cSJ. Bruce Fields } 173300fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 17347561042fSKevin Coffman /* slack space should prevent this ever happening: */ 17352d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 17362d2da60cSJ. Bruce Fields status = -EIO; 17372d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 17382d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 17392d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1740fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 17412d2da60cSJ. Bruce Fields else if (maj_stat) 17422d2da60cSJ. Bruce Fields return status; 17432d2da60cSJ. Bruce Fields 17442d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 17452d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 17462d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 17472d2da60cSJ. Bruce Fields iov = snd_buf->tail; 17482d2da60cSJ. Bruce Fields else 17492d2da60cSJ. Bruce Fields iov = snd_buf->head; 17502d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 17512d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 17522d2da60cSJ. Bruce Fields memset(p, 0, pad); 17532d2da60cSJ. Bruce Fields iov->iov_len += pad; 17542d2da60cSJ. Bruce Fields snd_buf->len += pad; 17552d2da60cSJ. Bruce Fields 17562d2da60cSJ. Bruce Fields return 0; 17572d2da60cSJ. Bruce Fields } 17582d2da60cSJ. Bruce Fields 17591da177e4SLinus Torvalds static int 17601da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 17619f06c719SChuck Lever kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) 17621da177e4SLinus Torvalds { 1763a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 17641da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 17651da177e4SLinus Torvalds gc_base); 17661da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 17671da177e4SLinus Torvalds int status = -EIO; 17681da177e4SLinus Torvalds 1769632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 17701da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 17711da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 17721da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 17731da177e4SLinus Torvalds */ 17749f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 17759f06c719SChuck Lever status = 0; 17761da177e4SLinus Torvalds goto out; 17771da177e4SLinus Torvalds } 17781da177e4SLinus Torvalds switch (gss_cred->gc_service) { 17791da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 17809f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 17819f06c719SChuck Lever status = 0; 17821da177e4SLinus Torvalds break; 17831da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 178489f0e4feSJoe Perches status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); 17851da177e4SLinus Torvalds break; 17861da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 178789f0e4feSJoe Perches status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); 17881da177e4SLinus Torvalds break; 17891da177e4SLinus Torvalds } 17901da177e4SLinus Torvalds out: 17911da177e4SLinus Torvalds gss_put_ctx(ctx); 1792632f0d05SChuck Lever dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); 17931da177e4SLinus Torvalds return status; 17941da177e4SLinus Torvalds } 17951da177e4SLinus Torvalds 17961da177e4SLinus Torvalds static inline int 17971da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1798d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 17991da177e4SLinus Torvalds { 18001da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 18011da177e4SLinus Torvalds struct xdr_buf integ_buf; 18021da177e4SLinus Torvalds struct xdr_netobj mic; 18031da177e4SLinus Torvalds u32 data_offset, mic_offset; 18041da177e4SLinus Torvalds u32 integ_len; 18051da177e4SLinus Torvalds u32 maj_stat; 18061da177e4SLinus Torvalds int status = -EIO; 18071da177e4SLinus Torvalds 18081da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 18091da177e4SLinus Torvalds if (integ_len & 3) 18101da177e4SLinus Torvalds return status; 18111da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 18121da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 18131da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 18141da177e4SLinus Torvalds return status; 18151da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 18161da177e4SLinus Torvalds return status; 18171da177e4SLinus Torvalds 18181da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 18191da177e4SLinus Torvalds mic_offset - data_offset)) 18201da177e4SLinus Torvalds return status; 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 18231da177e4SLinus Torvalds return status; 18241da177e4SLinus Torvalds 182500fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 18261da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1827fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 18281da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 18291da177e4SLinus Torvalds return status; 18301da177e4SLinus Torvalds return 0; 18311da177e4SLinus Torvalds } 18321da177e4SLinus Torvalds 18332d2da60cSJ. Bruce Fields static inline int 18342d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1835d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 18362d2da60cSJ. Bruce Fields { 18372d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 18382d2da60cSJ. Bruce Fields u32 offset; 18392d2da60cSJ. Bruce Fields u32 opaque_len; 18402d2da60cSJ. Bruce Fields u32 maj_stat; 18412d2da60cSJ. Bruce Fields int status = -EIO; 18422d2da60cSJ. Bruce Fields 18432d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 18442d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 18452d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 18462d2da60cSJ. Bruce Fields return status; 18472d2da60cSJ. Bruce Fields /* remove padding: */ 18482d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 18492d2da60cSJ. Bruce Fields 185000fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 18512d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1852fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 18532d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 18542d2da60cSJ. Bruce Fields return status; 18552d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 18562d2da60cSJ. Bruce Fields return status; 18572d2da60cSJ. Bruce Fields 18582d2da60cSJ. Bruce Fields return 0; 18592d2da60cSJ. Bruce Fields } 18602d2da60cSJ. Bruce Fields 1861bf269551SChuck Lever static int 1862bf269551SChuck Lever gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, 1863bf269551SChuck Lever __be32 *p, void *obj) 1864bf269551SChuck Lever { 1865bf269551SChuck Lever struct xdr_stream xdr; 1866bf269551SChuck Lever 1867bf269551SChuck Lever xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); 1868bf269551SChuck Lever return decode(rqstp, &xdr, obj); 1869bf269551SChuck Lever } 18702d2da60cSJ. Bruce Fields 18711da177e4SLinus Torvalds static int 18721da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1873bf269551SChuck Lever kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) 18741da177e4SLinus Torvalds { 1875a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 18761da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 18771da177e4SLinus Torvalds gc_base); 18781da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1879d8ed029dSAlexey Dobriyan __be32 *savedp = p; 18802d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 18812d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 18821da177e4SLinus Torvalds int status = -EIO; 18831da177e4SLinus Torvalds 18841da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 18851da177e4SLinus Torvalds goto out_decode; 18861da177e4SLinus Torvalds switch (gss_cred->gc_service) { 18871da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 18881da177e4SLinus Torvalds break; 18891da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 18901da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 18911da177e4SLinus Torvalds if (status) 18921da177e4SLinus Torvalds goto out; 18931da177e4SLinus Torvalds break; 18941da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 18952d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 18962d2da60cSJ. Bruce Fields if (status) 18972d2da60cSJ. Bruce Fields goto out; 18981da177e4SLinus Torvalds break; 18991da177e4SLinus Torvalds } 190024b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 19011be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 19022d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 19031da177e4SLinus Torvalds out_decode: 1904bf269551SChuck Lever status = gss_unwrap_req_decode(decode, rqstp, p, obj); 19051da177e4SLinus Torvalds out: 19061da177e4SLinus Torvalds gss_put_ctx(ctx); 1907632f0d05SChuck Lever dprintk("RPC: %5u %s returning %d\n", 1908632f0d05SChuck Lever task->tk_pid, __func__, status); 19091da177e4SLinus Torvalds return status; 19101da177e4SLinus Torvalds } 19111da177e4SLinus Torvalds 1912f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 19131da177e4SLinus Torvalds .owner = THIS_MODULE, 19141da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 19151da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 19161da177e4SLinus Torvalds .create = gss_create, 19171da177e4SLinus Torvalds .destroy = gss_destroy, 19181da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 191980df9d20SStanislav Kinsbursky .crcreate = gss_create_cred, 19206a1a1e34SChuck Lever .list_pseudoflavors = gss_mech_list_pseudoflavors, 19219568c5e9SChuck Lever .info2flavor = gss_mech_info2flavor, 1922a77c806fSChuck Lever .flavor2info = gss_mech_flavor2info, 19231da177e4SLinus Torvalds }; 19241da177e4SLinus Torvalds 1925f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 19261da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 19271da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1928fba3bad4STrond Myklebust .cr_init = gss_cred_init, 19295c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 19301da177e4SLinus Torvalds .crmatch = gss_match, 19311da177e4SLinus Torvalds .crmarshal = gss_marshal, 19321da177e4SLinus Torvalds .crrefresh = gss_refresh, 19331da177e4SLinus Torvalds .crvalidate = gss_validate, 19341da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 19351da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 19364de6caa2SAndy Adamson .crkey_timeout = gss_key_timeout, 19371da177e4SLinus Torvalds }; 19381da177e4SLinus Torvalds 19390df7fb74STrond Myklebust static const struct rpc_credops gss_nullops = { 19400df7fb74STrond Myklebust .cr_name = "AUTH_GSS", 19416dcd3926SJeff Layton .crdestroy = gss_destroy_nullcred, 19425c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 19430df7fb74STrond Myklebust .crmatch = gss_match, 19440df7fb74STrond Myklebust .crmarshal = gss_marshal, 19450df7fb74STrond Myklebust .crrefresh = gss_refresh_null, 19460df7fb74STrond Myklebust .crvalidate = gss_validate, 19470df7fb74STrond Myklebust .crwrap_req = gss_wrap_req, 19480df7fb74STrond Myklebust .crunwrap_resp = gss_unwrap_resp, 19490df7fb74STrond Myklebust }; 19500df7fb74STrond Myklebust 1951b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0 = { 1952c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 19531da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 19541da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 195534769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v0, 195634769fc4S\"J. Bruce Fields\ .release_pipe = gss_pipe_release, 195734769fc4S\"J. Bruce Fields\ }; 195834769fc4S\"J. Bruce Fields\ 1959b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1 = { 1960c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 196134769fc4S\"J. Bruce Fields\ .downcall = gss_pipe_downcall, 196234769fc4S\"J. Bruce Fields\ .destroy_msg = gss_pipe_destroy_msg, 196334769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v1, 19641da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 19651da177e4SLinus Torvalds }; 19661da177e4SLinus Torvalds 1967a1db410dSStanislav Kinsbursky static __net_init int rpcsec_gss_init_net(struct net *net) 1968a1db410dSStanislav Kinsbursky { 1969a1db410dSStanislav Kinsbursky return gss_svc_init_net(net); 1970a1db410dSStanislav Kinsbursky } 1971a1db410dSStanislav Kinsbursky 1972a1db410dSStanislav Kinsbursky static __net_exit void rpcsec_gss_exit_net(struct net *net) 1973a1db410dSStanislav Kinsbursky { 1974a1db410dSStanislav Kinsbursky gss_svc_shutdown_net(net); 1975a1db410dSStanislav Kinsbursky } 1976a1db410dSStanislav Kinsbursky 1977a1db410dSStanislav Kinsbursky static struct pernet_operations rpcsec_gss_net_ops = { 1978a1db410dSStanislav Kinsbursky .init = rpcsec_gss_init_net, 1979a1db410dSStanislav Kinsbursky .exit = rpcsec_gss_exit_net, 1980a1db410dSStanislav Kinsbursky }; 1981a1db410dSStanislav Kinsbursky 19821da177e4SLinus Torvalds /* 19831da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 19841da177e4SLinus Torvalds */ 19851da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 19861da177e4SLinus Torvalds { 19871da177e4SLinus Torvalds int err = 0; 19881da177e4SLinus Torvalds 19891da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 19901da177e4SLinus Torvalds if (err) 19911da177e4SLinus Torvalds goto out; 19921da177e4SLinus Torvalds err = gss_svc_init(); 19931da177e4SLinus Torvalds if (err) 19941da177e4SLinus Torvalds goto out_unregister; 1995a1db410dSStanislav Kinsbursky err = register_pernet_subsys(&rpcsec_gss_net_ops); 1996a1db410dSStanislav Kinsbursky if (err) 1997a1db410dSStanislav Kinsbursky goto out_svc_exit; 199879a3f20bS\"J. Bruce Fields\ rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); 19991da177e4SLinus Torvalds return 0; 2000a1db410dSStanislav Kinsbursky out_svc_exit: 2001a1db410dSStanislav Kinsbursky gss_svc_shutdown(); 20021da177e4SLinus Torvalds out_unregister: 20031da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 20041da177e4SLinus Torvalds out: 20051da177e4SLinus Torvalds return err; 20061da177e4SLinus Torvalds } 20071da177e4SLinus Torvalds 20081da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 20091da177e4SLinus Torvalds { 2010a1db410dSStanislav Kinsbursky unregister_pernet_subsys(&rpcsec_gss_net_ops); 20111da177e4SLinus Torvalds gss_svc_shutdown(); 20121da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 2013bf12691dSJesper Dangaard Brouer rcu_barrier(); /* Wait for completion of call_rcu()'s */ 20141da177e4SLinus Torvalds } 20151da177e4SLinus Torvalds 201671afa85eSChuck Lever MODULE_ALIAS("rpc-auth-6"); 20171da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2018126e216aSTrond Myklebust module_param_named(expired_cred_retry_delay, 2019126e216aSTrond Myklebust gss_expired_cred_retry_delay, 2020126e216aSTrond Myklebust uint, 0644); 2021126e216aSTrond Myklebust MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " 2022126e216aSTrond Myklebust "the RPC engine retries an expired credential"); 2023126e216aSTrond Myklebust 20244de6caa2SAndy Adamson module_param_named(key_expire_timeo, 20254de6caa2SAndy Adamson gss_key_expire_timeo, 20264de6caa2SAndy Adamson uint, 0644); 20274de6caa2SAndy Adamson MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " 20284de6caa2SAndy Adamson "credential keys lifetime where the NFS layer cleans up " 20294de6caa2SAndy Adamson "prior to key expiration"); 20304de6caa2SAndy Adamson 20311da177e4SLinus Torvalds module_init(init_rpcsec_gss) 20321da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 2033