11da177e4SLinus Torvalds /* 2f30c2269SUwe Zeisberger * linux/net/sunrpc/auth_gss/auth_gss.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * RPCSEC_GSS client authentication. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (c) 2000 The Regents of the University of Michigan. 71da177e4SLinus Torvalds * All rights reserved. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Dug Song <dugsong@monkey.org> 101da177e4SLinus Torvalds * Andy Adamson <andros@umich.edu> 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Redistribution and use in source and binary forms, with or without 131da177e4SLinus Torvalds * modification, are permitted provided that the following conditions 141da177e4SLinus Torvalds * are met: 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * 1. Redistributions of source code must retain the above copyright 171da177e4SLinus Torvalds * notice, this list of conditions and the following disclaimer. 181da177e4SLinus Torvalds * 2. Redistributions in binary form must reproduce the above copyright 191da177e4SLinus Torvalds * notice, this list of conditions and the following disclaimer in the 201da177e4SLinus Torvalds * documentation and/or other materials provided with the distribution. 211da177e4SLinus Torvalds * 3. Neither the name of the University nor the names of its 221da177e4SLinus Torvalds * contributors may be used to endorse or promote products derived 231da177e4SLinus Torvalds * from this software without specific prior written permission. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 261da177e4SLinus Torvalds * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 271da177e4SLinus Torvalds * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 281da177e4SLinus Torvalds * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 291da177e4SLinus Torvalds * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 301da177e4SLinus Torvalds * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 311da177e4SLinus Torvalds * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 321da177e4SLinus Torvalds * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 331da177e4SLinus Torvalds * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 341da177e4SLinus Torvalds * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 351da177e4SLinus Torvalds * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 361da177e4SLinus Torvalds */ 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #include <linux/module.h> 401da177e4SLinus Torvalds #include <linux/init.h> 411da177e4SLinus Torvalds #include <linux/types.h> 421da177e4SLinus Torvalds #include <linux/slab.h> 431da177e4SLinus Torvalds #include <linux/sched.h> 442d2da60cSJ. Bruce Fields #include <linux/pagemap.h> 451da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 461da177e4SLinus Torvalds #include <linux/sunrpc/auth.h> 471da177e4SLinus Torvalds #include <linux/sunrpc/auth_gss.h> 481da177e4SLinus Torvalds #include <linux/sunrpc/svcauth_gss.h> 491da177e4SLinus Torvalds #include <linux/sunrpc/gss_err.h> 501da177e4SLinus Torvalds #include <linux/workqueue.h> 511da177e4SLinus Torvalds #include <linux/sunrpc/rpc_pipe_fs.h> 521da177e4SLinus Torvalds #include <linux/sunrpc/gss_api.h> 531da177e4SLinus Torvalds #include <asm/uaccess.h> 54eb6dc19dSTrond Myklebust #include <linux/hashtable.h> 551da177e4SLinus Torvalds 56abfdbd53STrond Myklebust #include "../netns.h" 57abfdbd53STrond Myklebust 58f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops; 591da177e4SLinus Torvalds 60f1c0a861STrond Myklebust static const struct rpc_credops gss_credops; 610df7fb74STrond Myklebust static const struct rpc_credops gss_nullops; 621da177e4SLinus Torvalds 63126e216aSTrond Myklebust #define GSS_RETRY_EXPIRED 5 64126e216aSTrond Myklebust static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; 65126e216aSTrond Myklebust 664de6caa2SAndy Adamson #define GSS_KEY_EXPIRE_TIMEO 240 674de6caa2SAndy Adamson static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO; 684de6caa2SAndy Adamson 691da177e4SLinus Torvalds #ifdef RPC_DEBUG 701da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_AUTH 711da177e4SLinus Torvalds #endif 721da177e4SLinus Torvalds 73725f2865SKevin Coffman #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) 741da177e4SLinus Torvalds /* length of a krb5 verifier (48), plus data added before arguments when 751da177e4SLinus Torvalds * using integrity (two 4-byte integers): */ 76adeb8133SOlga Kornievskaia #define GSS_VERF_SLACK 100 771da177e4SLinus Torvalds 7823c323afSTrond Myklebust static DEFINE_HASHTABLE(gss_auth_hash_table, 4); 79eb6dc19dSTrond Myklebust static DEFINE_SPINLOCK(gss_auth_hash_lock); 80eb6dc19dSTrond Myklebust 8119172284STrond Myklebust struct gss_pipe { 8219172284STrond Myklebust struct rpc_pipe_dir_object pdo; 8319172284STrond Myklebust struct rpc_pipe *pipe; 8419172284STrond Myklebust struct rpc_clnt *clnt; 8519172284STrond Myklebust const char *name; 86414a6295STrond Myklebust struct kref kref; 8719172284STrond Myklebust }; 8819172284STrond Myklebust 891da177e4SLinus Torvalds struct gss_auth { 900285ed1fSTrond Myklebust struct kref kref; 91eb6dc19dSTrond Myklebust struct hlist_node hash; 921da177e4SLinus Torvalds struct rpc_auth rpc_auth; 931da177e4SLinus Torvalds struct gss_api_mech *mech; 941da177e4SLinus Torvalds enum rpc_gss_svc service; 951da177e4SLinus Torvalds struct rpc_clnt *client; 96e726340aSTrond Myklebust struct net *net; 9734769fc4S\"J. Bruce Fields\ /* 9834769fc4S\"J. Bruce Fields\ * There are two upcall pipes; dentry[1], named "gssd", is used 9934769fc4S\"J. Bruce Fields\ * for the new text-based upcall; dentry[0] is named after the 10034769fc4S\"J. Bruce Fields\ * mechanism (for example, "krb5") and exists for 10134769fc4S\"J. Bruce Fields\ * backwards-compatibility with older gssd's. 10234769fc4S\"J. Bruce Fields\ */ 10319172284STrond Myklebust struct gss_pipe *gss_pipe[2]; 104bd4a3eb1STrond Myklebust const char *target_name; 1051da177e4SLinus Torvalds }; 1061da177e4SLinus Torvalds 10779a3f20bS\"J. Bruce Fields\ /* pipe_version >= 0 if and only if someone has a pipe open. */ 10879a3f20bS\"J. Bruce Fields\ static DEFINE_SPINLOCK(pipe_version_lock); 10979a3f20bS\"J. Bruce Fields\ static struct rpc_wait_queue pipe_version_rpc_waitqueue; 11079a3f20bS\"J. Bruce Fields\ static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); 111cf81939dS\"J. Bruce Fields\ 1125d28dc82STrond Myklebust static void gss_free_ctx(struct gss_cl_ctx *); 113b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0; 114b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1; 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds static inline struct gss_cl_ctx * 1171da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 1181da177e4SLinus Torvalds { 1191da177e4SLinus Torvalds atomic_inc(&ctx->count); 1201da177e4SLinus Torvalds return ctx; 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds static inline void 1241da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1251da177e4SLinus Torvalds { 1261da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1275d28dc82STrond Myklebust gss_free_ctx(ctx); 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 1305d28dc82STrond Myklebust /* gss_cred_set_ctx: 1315d28dc82STrond Myklebust * called by gss_upcall_callback and gss_create_upcall in order 1325d28dc82STrond Myklebust * to set the gss context. The actual exchange of an old context 1339beae467SStanislav Kinsbursky * and a new one is protected by the pipe->lock. 1345d28dc82STrond Myklebust */ 1351da177e4SLinus Torvalds static void 1361da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1371da177e4SLinus Torvalds { 1381da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1395d28dc82STrond Myklebust 140cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 141cd019f75STrond Myklebust return; 1427b6962b0STrond Myklebust gss_get_ctx(ctx); 143cf778b00SEric Dumazet rcu_assign_pointer(gss_cred->gc_ctx, ctx); 144fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 145cd019f75STrond Myklebust smp_mb__before_clear_bit(); 146fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds static const void * 1501da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1511da177e4SLinus Torvalds { 1521da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1531da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1541da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1551da177e4SLinus Torvalds memcpy(res, p, len); 1561da177e4SLinus Torvalds return q; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds static inline const void * 1601da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds const void *q; 1631da177e4SLinus Torvalds unsigned int len; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1661da177e4SLinus Torvalds if (IS_ERR(p)) 1671da177e4SLinus Torvalds return p; 1681da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1691da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1701da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1710f38b873STrond Myklebust dest->data = kmemdup(p, len, GFP_NOFS); 1721da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1731da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1741da177e4SLinus Torvalds dest->len = len; 1751da177e4SLinus Torvalds return q; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds static struct gss_cl_ctx * 1791da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1801da177e4SLinus Torvalds { 1811da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1821da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1831da177e4SLinus Torvalds 1845d28dc82STrond Myklebust rcu_read_lock(); 1851da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1861da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1875d28dc82STrond Myklebust rcu_read_unlock(); 1881da177e4SLinus Torvalds return ctx; 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds static struct gss_cl_ctx * 1921da177e4SLinus Torvalds gss_alloc_context(void) 1931da177e4SLinus Torvalds { 1941da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1951da177e4SLinus Torvalds 1960f38b873STrond Myklebust ctx = kzalloc(sizeof(*ctx), GFP_NOFS); 1971da177e4SLinus Torvalds if (ctx != NULL) { 1981da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 1991da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 2001da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 2011da177e4SLinus Torvalds atomic_set(&ctx->count,1); 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds return ctx; 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 2071da177e4SLinus Torvalds static const void * 2081da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 2091da177e4SLinus Torvalds { 2101da177e4SLinus Torvalds const void *q; 2111da177e4SLinus Torvalds unsigned int seclen; 2121da177e4SLinus Torvalds unsigned int timeout; 213620038f6SAndy Adamson unsigned long now = jiffies; 2141da177e4SLinus Torvalds u32 window_size; 2151da177e4SLinus Torvalds int ret; 2161da177e4SLinus Torvalds 217620038f6SAndy Adamson /* First unsigned int gives the remaining lifetime in seconds of the 218620038f6SAndy Adamson * credential - e.g. the remaining TGT lifetime for Kerberos or 219620038f6SAndy Adamson * the -t value passed to GSSD. 220620038f6SAndy Adamson */ 2211da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2221da177e4SLinus Torvalds if (IS_ERR(p)) 2231da177e4SLinus Torvalds goto err; 2241da177e4SLinus Torvalds if (timeout == 0) 2251da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 226620038f6SAndy Adamson ctx->gc_expiry = now + ((unsigned long)timeout * HZ); 227620038f6SAndy Adamson /* Sequence number window. Determines the maximum number of 228620038f6SAndy Adamson * simultaneous requests 229620038f6SAndy Adamson */ 2301da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2311da177e4SLinus Torvalds if (IS_ERR(p)) 2321da177e4SLinus Torvalds goto err; 2331da177e4SLinus Torvalds ctx->gc_win = window_size; 2341da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2351da177e4SLinus Torvalds if (ctx->gc_win == 0) { 236dc5ddce9SJeff Layton /* 237dc5ddce9SJeff Layton * in which case, p points to an error code. Anything other 238dc5ddce9SJeff Layton * than -EKEYEXPIRED gets converted to -EACCES. 239dc5ddce9SJeff Layton */ 240dc5ddce9SJeff Layton p = simple_get_bytes(p, end, &ret, sizeof(ret)); 241dc5ddce9SJeff Layton if (!IS_ERR(p)) 242dc5ddce9SJeff Layton p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : 243dc5ddce9SJeff Layton ERR_PTR(-EACCES); 2441da177e4SLinus Torvalds goto err; 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds /* copy the opaque wire context */ 2471da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2481da177e4SLinus Torvalds if (IS_ERR(p)) 2491da177e4SLinus Torvalds goto err; 2501da177e4SLinus Torvalds /* import the opaque security context */ 2511da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2521da177e4SLinus Torvalds if (IS_ERR(p)) 2531da177e4SLinus Torvalds goto err; 2541da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2551da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2561da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2571da177e4SLinus Torvalds goto err; 2581da177e4SLinus Torvalds } 259400f26b5SSimo Sorce ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); 2601da177e4SLinus Torvalds if (ret < 0) { 2611da177e4SLinus Torvalds p = ERR_PTR(ret); 2621da177e4SLinus Torvalds goto err; 2631da177e4SLinus Torvalds } 264620038f6SAndy Adamson dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n", 265620038f6SAndy Adamson __func__, ctx->gc_expiry, now, timeout); 2661da177e4SLinus Torvalds return q; 2671da177e4SLinus Torvalds err: 268173db309SJeff Layton dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); 2691da177e4SLinus Torvalds return p; 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 27234769fc4S\"J. Bruce Fields\ #define UPCALL_BUF_LEN 128 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds struct gss_upcall_msg { 2751da177e4SLinus Torvalds atomic_t count; 2767eaf040bSEric W. Biederman kuid_t uid; 2771da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2781da177e4SLinus Torvalds struct list_head list; 2791da177e4SLinus Torvalds struct gss_auth *auth; 2809beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 2811da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2821da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2831da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 28434769fc4S\"J. Bruce Fields\ char databuf[UPCALL_BUF_LEN]; 2851da177e4SLinus Torvalds }; 2861da177e4SLinus Torvalds 2872aed8b47STrond Myklebust static int get_pipe_version(struct net *net) 28879a3f20bS\"J. Bruce Fields\ { 2892aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 29079a3f20bS\"J. Bruce Fields\ int ret; 29179a3f20bS\"J. Bruce Fields\ 29279a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 2932aed8b47STrond Myklebust if (sn->pipe_version >= 0) { 2942aed8b47STrond Myklebust atomic_inc(&sn->pipe_users); 2952aed8b47STrond Myklebust ret = sn->pipe_version; 29679a3f20bS\"J. Bruce Fields\ } else 29779a3f20bS\"J. Bruce Fields\ ret = -EAGAIN; 29879a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 29979a3f20bS\"J. Bruce Fields\ return ret; 30079a3f20bS\"J. Bruce Fields\ } 30179a3f20bS\"J. Bruce Fields\ 3022aed8b47STrond Myklebust static void put_pipe_version(struct net *net) 30379a3f20bS\"J. Bruce Fields\ { 3042aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 3052aed8b47STrond Myklebust 3062aed8b47STrond Myklebust if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { 3072aed8b47STrond Myklebust sn->pipe_version = -1; 30879a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 30979a3f20bS\"J. Bruce Fields\ } 31079a3f20bS\"J. Bruce Fields\ } 31179a3f20bS\"J. Bruce Fields\ 3121da177e4SLinus Torvalds static void 3131da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 3141da177e4SLinus Torvalds { 315e726340aSTrond Myklebust struct net *net = gss_msg->auth->net; 3161da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 3171da177e4SLinus Torvalds return; 3182aed8b47STrond Myklebust put_pipe_version(net); 3191da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 3201da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 3211da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 322f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 3231da177e4SLinus Torvalds kfree(gss_msg); 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds static struct gss_upcall_msg * 3277eaf040bSEric W. Biederman __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid) 3281da177e4SLinus Torvalds { 3291da177e4SLinus Torvalds struct gss_upcall_msg *pos; 3309beae467SStanislav Kinsbursky list_for_each_entry(pos, &pipe->in_downcall, list) { 3310b4d51b0SEric W. Biederman if (!uid_eq(pos->uid, uid)) 3321da177e4SLinus Torvalds continue; 3331da177e4SLinus Torvalds atomic_inc(&pos->count); 334632f0d05SChuck Lever dprintk("RPC: %s found msg %p\n", __func__, pos); 3351da177e4SLinus Torvalds return pos; 3361da177e4SLinus Torvalds } 337632f0d05SChuck Lever dprintk("RPC: %s found nothing\n", __func__); 3381da177e4SLinus Torvalds return NULL; 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds 341720b8f2dS\\\"J. Bruce Fields\\\ /* Try to add an upcall to the pipefs queue. 3421da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 3431da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 3441da177e4SLinus Torvalds */ 3451da177e4SLinus Torvalds static inline struct gss_upcall_msg * 346053e324fSSuresh Jayaraman gss_add_msg(struct gss_upcall_msg *gss_msg) 3471da177e4SLinus Torvalds { 3489beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3491da177e4SLinus Torvalds struct gss_upcall_msg *old; 3501da177e4SLinus Torvalds 3519beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3529beae467SStanislav Kinsbursky old = __gss_find_upcall(pipe, gss_msg->uid); 3531da177e4SLinus Torvalds if (old == NULL) { 3541da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3559beae467SStanislav Kinsbursky list_add(&gss_msg->list, &pipe->in_downcall); 3561da177e4SLinus Torvalds } else 3571da177e4SLinus Torvalds gss_msg = old; 3589beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3591da177e4SLinus Torvalds return gss_msg; 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds static void 3631da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3641da177e4SLinus Torvalds { 3651da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3661da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3671da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3681da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds static void 3721da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3731da177e4SLinus Torvalds { 3749beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3751da177e4SLinus Torvalds 3763b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3773b68aaeaSTrond Myklebust return; 3789beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3793b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3801da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 3819beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds static void 385126e216aSTrond Myklebust gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) 386126e216aSTrond Myklebust { 387126e216aSTrond Myklebust switch (gss_msg->msg.errno) { 388126e216aSTrond Myklebust case 0: 389126e216aSTrond Myklebust if (gss_msg->ctx == NULL) 390126e216aSTrond Myklebust break; 391126e216aSTrond Myklebust clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 392126e216aSTrond Myklebust gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); 393126e216aSTrond Myklebust break; 394126e216aSTrond Myklebust case -EKEYEXPIRED: 395126e216aSTrond Myklebust set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 396126e216aSTrond Myklebust } 397126e216aSTrond Myklebust gss_cred->gc_upcall_timestamp = jiffies; 398126e216aSTrond Myklebust gss_cred->gc_upcall = NULL; 399126e216aSTrond Myklebust rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 400126e216aSTrond Myklebust } 401126e216aSTrond Myklebust 402126e216aSTrond Myklebust static void 4031da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 4041da177e4SLinus Torvalds { 405a17c2153STrond Myklebust struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, 4061da177e4SLinus Torvalds struct gss_cred, gc_base); 4071da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 4089beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 4091da177e4SLinus Torvalds 4109beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 411126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 4129beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 413126e216aSTrond Myklebust task->tk_status = gss_msg->msg.errno; 4141da177e4SLinus Torvalds gss_release_msg(gss_msg); 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 41734769fc4S\"J. Bruce Fields\ static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) 41834769fc4S\"J. Bruce Fields\ { 41990602c7bSEric W. Biederman uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); 42090602c7bSEric W. Biederman memcpy(gss_msg->databuf, &uid, sizeof(uid)); 42190602c7bSEric W. Biederman gss_msg->msg.data = gss_msg->databuf; 42290602c7bSEric W. Biederman gss_msg->msg.len = sizeof(uid); 4239d3a2260STrond Myklebust 4249d3a2260STrond Myklebust BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf)); 42534769fc4S\"J. Bruce Fields\ } 42634769fc4S\"J. Bruce Fields\ 4279d3a2260STrond Myklebust static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, 428bd4a3eb1STrond Myklebust const char *service_name, 429bd4a3eb1STrond Myklebust const char *target_name) 43034769fc4S\"J. Bruce Fields\ { 431683ac665STrond Myklebust struct gss_api_mech *mech = gss_msg->auth->mech; 4328b1c7bf5SOlga Kornievskaia char *p = gss_msg->databuf; 4339d3a2260STrond Myklebust size_t buflen = sizeof(gss_msg->databuf); 4349d3a2260STrond Myklebust int len; 4358b1c7bf5SOlga Kornievskaia 4369d3a2260STrond Myklebust len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name, 43790602c7bSEric W. Biederman from_kuid(&init_user_ns, gss_msg->uid)); 4389d3a2260STrond Myklebust buflen -= len; 4399d3a2260STrond Myklebust p += len; 4409d3a2260STrond Myklebust gss_msg->msg.len = len; 441bd4a3eb1STrond Myklebust if (target_name) { 4429d3a2260STrond Myklebust len = scnprintf(p, buflen, "target=%s ", target_name); 4439d3a2260STrond Myklebust buflen -= len; 4448b1c7bf5SOlga Kornievskaia p += len; 4458b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4468b1c7bf5SOlga Kornievskaia } 44768c97153STrond Myklebust if (service_name != NULL) { 4489d3a2260STrond Myklebust len = scnprintf(p, buflen, "service=%s ", service_name); 4499d3a2260STrond Myklebust buflen -= len; 4502efef708SOlga Kornievskaia p += len; 4512efef708SOlga Kornievskaia gss_msg->msg.len += len; 4522efef708SOlga Kornievskaia } 453683ac665STrond Myklebust if (mech->gm_upcall_enctypes) { 4549d3a2260STrond Myklebust len = scnprintf(p, buflen, "enctypes=%s ", 4559d3a2260STrond Myklebust mech->gm_upcall_enctypes); 4569d3a2260STrond Myklebust buflen -= len; 457683ac665STrond Myklebust p += len; 458683ac665STrond Myklebust gss_msg->msg.len += len; 459683ac665STrond Myklebust } 4609d3a2260STrond Myklebust len = scnprintf(p, buflen, "\n"); 4619d3a2260STrond Myklebust if (len == 0) 4629d3a2260STrond Myklebust goto out_overflow; 4638b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4648b1c7bf5SOlga Kornievskaia 46534769fc4S\"J. Bruce Fields\ gss_msg->msg.data = gss_msg->databuf; 4669d3a2260STrond Myklebust return 0; 4679d3a2260STrond Myklebust out_overflow: 4689d3a2260STrond Myklebust WARN_ON_ONCE(1); 4699d3a2260STrond Myklebust return -ENOMEM; 47034769fc4S\"J. Bruce Fields\ } 47134769fc4S\"J. Bruce Fields\ 47268c97153STrond Myklebust static struct gss_upcall_msg * 473e726340aSTrond Myklebust gss_alloc_msg(struct gss_auth *gss_auth, 4747eaf040bSEric W. Biederman kuid_t uid, const char *service_name) 4751da177e4SLinus Torvalds { 4761da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 47779a3f20bS\"J. Bruce Fields\ int vers; 4789d3a2260STrond Myklebust int err = -ENOMEM; 4791da177e4SLinus Torvalds 4800f38b873STrond Myklebust gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 481db75b3d6S\"J. Bruce Fields\ if (gss_msg == NULL) 4829d3a2260STrond Myklebust goto err; 483e726340aSTrond Myklebust vers = get_pipe_version(gss_auth->net); 4849d3a2260STrond Myklebust err = vers; 4859d3a2260STrond Myklebust if (err < 0) 4869d3a2260STrond Myklebust goto err_free_msg; 48719172284STrond Myklebust gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; 4881da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 4891da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 4901da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 4911da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 4921da177e4SLinus Torvalds gss_msg->uid = uid; 4931da177e4SLinus Torvalds gss_msg->auth = gss_auth; 494bd4a3eb1STrond Myklebust switch (vers) { 495bd4a3eb1STrond Myklebust case 0: 496bd4a3eb1STrond Myklebust gss_encode_v0_msg(gss_msg); 4975fccc5b5STrond Myklebust break; 498bd4a3eb1STrond Myklebust default: 4999d3a2260STrond Myklebust err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name); 5009d3a2260STrond Myklebust if (err) 5019d3a2260STrond Myklebust goto err_free_msg; 502bd4a3eb1STrond Myklebust }; 5031da177e4SLinus Torvalds return gss_msg; 5049d3a2260STrond Myklebust err_free_msg: 5059d3a2260STrond Myklebust kfree(gss_msg); 5069d3a2260STrond Myklebust err: 5079d3a2260STrond Myklebust return ERR_PTR(err); 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds 5101da177e4SLinus Torvalds static struct gss_upcall_msg * 511e726340aSTrond Myklebust gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) 5121da177e4SLinus Torvalds { 5137c67db3aSTrond Myklebust struct gss_cred *gss_cred = container_of(cred, 5147c67db3aSTrond Myklebust struct gss_cred, gc_base); 5151da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 5167eaf040bSEric W. Biederman kuid_t uid = cred->cr_uid; 5171da177e4SLinus Torvalds 518e726340aSTrond Myklebust gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); 519db75b3d6S\"J. Bruce Fields\ if (IS_ERR(gss_new)) 520db75b3d6S\"J. Bruce Fields\ return gss_new; 521053e324fSSuresh Jayaraman gss_msg = gss_add_msg(gss_new); 5221da177e4SLinus Torvalds if (gss_msg == gss_new) { 5239beae467SStanislav Kinsbursky int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); 5241da177e4SLinus Torvalds if (res) { 5251da177e4SLinus Torvalds gss_unhash_msg(gss_new); 5261da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds } else 5291da177e4SLinus Torvalds gss_release_msg(gss_new); 5301da177e4SLinus Torvalds return gss_msg; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 533b03568c3S\"J. Bruce Fields\ static void warn_gssd(void) 534b03568c3S\"J. Bruce Fields\ { 535b03568c3S\"J. Bruce Fields\ static unsigned long ratelimit; 536b03568c3S\"J. Bruce Fields\ unsigned long now = jiffies; 537b03568c3S\"J. Bruce Fields\ 538b03568c3S\"J. Bruce Fields\ if (time_after(now, ratelimit)) { 53989f84243SJeff Layton pr_warn("RPC: AUTH_GSS upcall failed. Please check user daemon is running.\n"); 540b03568c3S\"J. Bruce Fields\ ratelimit = now + 15*HZ; 541b03568c3S\"J. Bruce Fields\ } 542b03568c3S\"J. Bruce Fields\ } 543b03568c3S\"J. Bruce Fields\ 5441da177e4SLinus Torvalds static inline int 5451da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 5461da177e4SLinus Torvalds { 547a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 5484a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 5491da177e4SLinus Torvalds struct gss_auth, rpc_auth); 5501da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 5511da177e4SLinus Torvalds struct gss_cred, gc_base); 5521da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5539beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 5541da177e4SLinus Torvalds int err = 0; 5551da177e4SLinus Torvalds 556632f0d05SChuck Lever dprintk("RPC: %5u %s for uid %u\n", 557cdba321eSEric W. Biederman task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); 558e726340aSTrond Myklebust gss_msg = gss_setup_upcall(gss_auth, cred); 559480e3243SRoel Kluin if (PTR_ERR(gss_msg) == -EAGAIN) { 56079a3f20bS\"J. Bruce Fields\ /* XXX: warning on the first, under the assumption we 56179a3f20bS\"J. Bruce Fields\ * shouldn't normally hit this case on a refresh. */ 56279a3f20bS\"J. Bruce Fields\ warn_gssd(); 56379a3f20bS\"J. Bruce Fields\ task->tk_timeout = 15*HZ; 56479a3f20bS\"J. Bruce Fields\ rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); 565d1a8016aSBryan Schumaker return -EAGAIN; 56679a3f20bS\"J. Bruce Fields\ } 5671da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 5681da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 5691da177e4SLinus Torvalds goto out; 5701da177e4SLinus Torvalds } 5719beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 5729beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 5731da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 5745d00837bSTrond Myklebust rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 575126e216aSTrond Myklebust else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 5761da177e4SLinus Torvalds task->tk_timeout = 0; 5771da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 5781da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 5791da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5805d00837bSTrond Myklebust rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 581126e216aSTrond Myklebust } else { 582126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 5831da177e4SLinus Torvalds err = gss_msg->msg.errno; 584126e216aSTrond Myklebust } 5859beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 5861da177e4SLinus Torvalds gss_release_msg(gss_msg); 5871da177e4SLinus Torvalds out: 588632f0d05SChuck Lever dprintk("RPC: %5u %s for uid %u result %d\n", 589cdba321eSEric W. Biederman task->tk_pid, __func__, 590cdba321eSEric W. Biederman from_kuid(&init_user_ns, cred->cr_uid), err); 5911da177e4SLinus Torvalds return err; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds static inline int 5951da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 5961da177e4SLinus Torvalds { 597e726340aSTrond Myklebust struct net *net = gss_auth->net; 598abfdbd53STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 5999beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 6001da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 6011da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 6021da177e4SLinus Torvalds DEFINE_WAIT(wait); 603d36ccb9cSTrond Myklebust int err; 6041da177e4SLinus Torvalds 605cdba321eSEric W. Biederman dprintk("RPC: %s for uid %u\n", 606cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, cred->cr_uid)); 60779a3f20bS\"J. Bruce Fields\ retry: 608d36ccb9cSTrond Myklebust err = 0; 60989f84243SJeff Layton /* if gssd is down, just skip upcalling altogether */ 61089f84243SJeff Layton if (!gssd_running(net)) { 61189f84243SJeff Layton warn_gssd(); 61289f84243SJeff Layton return -EACCES; 61389f84243SJeff Layton } 614e726340aSTrond Myklebust gss_msg = gss_setup_upcall(gss_auth, cred); 61579a3f20bS\"J. Bruce Fields\ if (PTR_ERR(gss_msg) == -EAGAIN) { 61679a3f20bS\"J. Bruce Fields\ err = wait_event_interruptible_timeout(pipe_version_waitqueue, 61789f84243SJeff Layton sn->pipe_version >= 0, 15 * HZ); 6182aed8b47STrond Myklebust if (sn->pipe_version < 0) { 619d1a8016aSBryan Schumaker warn_gssd(); 620d1a8016aSBryan Schumaker err = -EACCES; 621d1a8016aSBryan Schumaker } 622d36ccb9cSTrond Myklebust if (err < 0) 62379a3f20bS\"J. Bruce Fields\ goto out; 62479a3f20bS\"J. Bruce Fields\ goto retry; 62579a3f20bS\"J. Bruce Fields\ } 6261da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 6271da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 6281da177e4SLinus Torvalds goto out; 6291da177e4SLinus Torvalds } 6309beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 6311da177e4SLinus Torvalds for (;;) { 6325afa9133STrond Myklebust prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); 6339beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 6341da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 6351da177e4SLinus Torvalds break; 6361da177e4SLinus Torvalds } 6379beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6385afa9133STrond Myklebust if (fatal_signal_pending(current)) { 6391da177e4SLinus Torvalds err = -ERESTARTSYS; 6401da177e4SLinus Torvalds goto out_intr; 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds schedule(); 6431da177e4SLinus Torvalds } 6441da177e4SLinus Torvalds if (gss_msg->ctx) 6457b6962b0STrond Myklebust gss_cred_set_ctx(cred, gss_msg->ctx); 6461da177e4SLinus Torvalds else 6471da177e4SLinus Torvalds err = gss_msg->msg.errno; 6489beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6491da177e4SLinus Torvalds out_intr: 6501da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 6511da177e4SLinus Torvalds gss_release_msg(gss_msg); 6521da177e4SLinus Torvalds out: 653632f0d05SChuck Lever dprintk("RPC: %s for uid %u result %d\n", 654cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, cred->cr_uid), err); 6551da177e4SLinus Torvalds return err; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds static ssize_t 6611da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 6621da177e4SLinus Torvalds { 6631da177e4SLinus Torvalds const void *p, *end; 6641da177e4SLinus Torvalds void *buf; 6651da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 666496ad9aaSAl Viro struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; 6671da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 66890602c7bSEric W. Biederman uid_t id; 66990602c7bSEric W. Biederman kuid_t uid; 6703b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 6731da177e4SLinus Torvalds goto out; 6741da177e4SLinus Torvalds err = -ENOMEM; 6750f38b873STrond Myklebust buf = kmalloc(mlen, GFP_NOFS); 6761da177e4SLinus Torvalds if (!buf) 6771da177e4SLinus Torvalds goto out; 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds err = -EFAULT; 6801da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 6811da177e4SLinus Torvalds goto err; 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 68490602c7bSEric W. Biederman p = simple_get_bytes(buf, end, &id, sizeof(id)); 6851da177e4SLinus Torvalds if (IS_ERR(p)) { 6861da177e4SLinus Torvalds err = PTR_ERR(p); 6871da177e4SLinus Torvalds goto err; 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds 69090602c7bSEric W. Biederman uid = make_kuid(&init_user_ns, id); 69190602c7bSEric W. Biederman if (!uid_valid(uid)) { 69290602c7bSEric W. Biederman err = -EINVAL; 69390602c7bSEric W. Biederman goto err; 69490602c7bSEric W. Biederman } 69590602c7bSEric W. Biederman 6961da177e4SLinus Torvalds err = -ENOMEM; 6971da177e4SLinus Torvalds ctx = gss_alloc_context(); 6981da177e4SLinus Torvalds if (ctx == NULL) 6991da177e4SLinus Torvalds goto err; 7003b68aaeaSTrond Myklebust 7013b68aaeaSTrond Myklebust err = -ENOENT; 7023b68aaeaSTrond Myklebust /* Find a matching upcall */ 7039beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7049beae467SStanislav Kinsbursky gss_msg = __gss_find_upcall(pipe, uid); 7053b68aaeaSTrond Myklebust if (gss_msg == NULL) { 7069beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7073b68aaeaSTrond Myklebust goto err_put_ctx; 7083b68aaeaSTrond Myklebust } 7093b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 7109beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7113b68aaeaSTrond Myklebust 7126e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 7131da177e4SLinus Torvalds if (IS_ERR(p)) { 7141da177e4SLinus Torvalds err = PTR_ERR(p); 715486bad2eSJeff Layton switch (err) { 716486bad2eSJeff Layton case -EACCES: 717dc5ddce9SJeff Layton case -EKEYEXPIRED: 718486bad2eSJeff Layton gss_msg->msg.errno = err; 719486bad2eSJeff Layton err = mlen; 720486bad2eSJeff Layton break; 721486bad2eSJeff Layton case -EFAULT: 722486bad2eSJeff Layton case -ENOMEM: 723486bad2eSJeff Layton case -EINVAL: 724486bad2eSJeff Layton case -ENOSYS: 725486bad2eSJeff Layton gss_msg->msg.errno = -EAGAIN; 726486bad2eSJeff Layton break; 727486bad2eSJeff Layton default: 728486bad2eSJeff Layton printk(KERN_CRIT "%s: bad return from " 7296c853099SRandy Dunlap "gss_fill_context: %zd\n", __func__, err); 730486bad2eSJeff Layton BUG(); 731486bad2eSJeff Layton } 7323b68aaeaSTrond Myklebust goto err_release_msg; 7331da177e4SLinus Torvalds } 7341da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 7353b68aaeaSTrond Myklebust err = mlen; 7363b68aaeaSTrond Myklebust 7373b68aaeaSTrond Myklebust err_release_msg: 7389beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7391da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 7409beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7411da177e4SLinus Torvalds gss_release_msg(gss_msg); 7421da177e4SLinus Torvalds err_put_ctx: 7431da177e4SLinus Torvalds gss_put_ctx(ctx); 7441da177e4SLinus Torvalds err: 7451da177e4SLinus Torvalds kfree(buf); 7461da177e4SLinus Torvalds out: 747632f0d05SChuck Lever dprintk("RPC: %s returning %Zd\n", __func__, err); 7481da177e4SLinus Torvalds return err; 7491da177e4SLinus Torvalds } 7501da177e4SLinus Torvalds 75134769fc4S\"J. Bruce Fields\ static int gss_pipe_open(struct inode *inode, int new_version) 752cf81939dS\"J. Bruce Fields\ { 7532aed8b47STrond Myklebust struct net *net = inode->i_sb->s_fs_info; 7542aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 75534769fc4S\"J. Bruce Fields\ int ret = 0; 75634769fc4S\"J. Bruce Fields\ 75779a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 7582aed8b47STrond Myklebust if (sn->pipe_version < 0) { 75934769fc4S\"J. Bruce Fields\ /* First open of any gss pipe determines the version: */ 7602aed8b47STrond Myklebust sn->pipe_version = new_version; 76179a3f20bS\"J. Bruce Fields\ rpc_wake_up(&pipe_version_rpc_waitqueue); 76279a3f20bS\"J. Bruce Fields\ wake_up(&pipe_version_waitqueue); 7632aed8b47STrond Myklebust } else if (sn->pipe_version != new_version) { 76434769fc4S\"J. Bruce Fields\ /* Trying to open a pipe of a different version */ 76534769fc4S\"J. Bruce Fields\ ret = -EBUSY; 76634769fc4S\"J. Bruce Fields\ goto out; 76779a3f20bS\"J. Bruce Fields\ } 7682aed8b47STrond Myklebust atomic_inc(&sn->pipe_users); 76934769fc4S\"J. Bruce Fields\ out: 77079a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 77134769fc4S\"J. Bruce Fields\ return ret; 77234769fc4S\"J. Bruce Fields\ 77334769fc4S\"J. Bruce Fields\ } 77434769fc4S\"J. Bruce Fields\ 77534769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v0(struct inode *inode) 77634769fc4S\"J. Bruce Fields\ { 77734769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 0); 77834769fc4S\"J. Bruce Fields\ } 77934769fc4S\"J. Bruce Fields\ 78034769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v1(struct inode *inode) 78134769fc4S\"J. Bruce Fields\ { 78234769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 1); 783cf81939dS\"J. Bruce Fields\ } 784cf81939dS\"J. Bruce Fields\ 7851da177e4SLinus Torvalds static void 7861da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 7871da177e4SLinus Torvalds { 7882aed8b47STrond Myklebust struct net *net = inode->i_sb->s_fs_info; 7899beae467SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 7901da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 7911da177e4SLinus Torvalds 7925a67657aSTrond Myklebust restart: 7939beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7949beae467SStanislav Kinsbursky list_for_each_entry(gss_msg, &pipe->in_downcall, list) { 7956e84c7b6STrond Myklebust 7965a67657aSTrond Myklebust if (!list_empty(&gss_msg->msg.list)) 7975a67657aSTrond Myklebust continue; 7981da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 7991da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 8001da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 8019beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 8021da177e4SLinus Torvalds gss_release_msg(gss_msg); 8035a67657aSTrond Myklebust goto restart; 8041da177e4SLinus Torvalds } 8059beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 806cf81939dS\"J. Bruce Fields\ 8072aed8b47STrond Myklebust put_pipe_version(net); 8081da177e4SLinus Torvalds } 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds static void 8111da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 8121da177e4SLinus Torvalds { 8131da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvalds if (msg->errno < 0) { 816632f0d05SChuck Lever dprintk("RPC: %s releasing msg %p\n", 817632f0d05SChuck Lever __func__, gss_msg); 8181da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 8191da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 820b03568c3S\"J. Bruce Fields\ if (msg->errno == -ETIMEDOUT) 821b03568c3S\"J. Bruce Fields\ warn_gssd(); 8221da177e4SLinus Torvalds gss_release_msg(gss_msg); 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds } 8251da177e4SLinus Torvalds 82619172284STrond Myklebust static void gss_pipe_dentry_destroy(struct dentry *dir, 82719172284STrond Myklebust struct rpc_pipe_dir_object *pdo) 828ccdc28f8SStanislav Kinsbursky { 82919172284STrond Myklebust struct gss_pipe *gss_pipe = pdo->pdo_data; 83019172284STrond Myklebust struct rpc_pipe *pipe = gss_pipe->pipe; 831ccdc28f8SStanislav Kinsbursky 83219172284STrond Myklebust if (pipe->dentry != NULL) { 83319172284STrond Myklebust rpc_unlink(pipe->dentry); 83419172284STrond Myklebust pipe->dentry = NULL; 8356b2fddd3STrond Myklebust } 836ccdc28f8SStanislav Kinsbursky } 837ccdc28f8SStanislav Kinsbursky 83819172284STrond Myklebust static int gss_pipe_dentry_create(struct dentry *dir, 83919172284STrond Myklebust struct rpc_pipe_dir_object *pdo) 840ccdc28f8SStanislav Kinsbursky { 84119172284STrond Myklebust struct gss_pipe *p = pdo->pdo_data; 8426b2fddd3STrond Myklebust struct dentry *dentry; 843ccdc28f8SStanislav Kinsbursky 84419172284STrond Myklebust dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); 84519172284STrond Myklebust if (IS_ERR(dentry)) 84619172284STrond Myklebust return PTR_ERR(dentry); 84719172284STrond Myklebust p->pipe->dentry = dentry; 848ccdc28f8SStanislav Kinsbursky return 0; 84919172284STrond Myklebust } 850ccdc28f8SStanislav Kinsbursky 85119172284STrond Myklebust static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { 85219172284STrond Myklebust .create = gss_pipe_dentry_create, 85319172284STrond Myklebust .destroy = gss_pipe_dentry_destroy, 85419172284STrond Myklebust }; 85519172284STrond Myklebust 85619172284STrond Myklebust static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, 85719172284STrond Myklebust const char *name, 85819172284STrond Myklebust const struct rpc_pipe_ops *upcall_ops) 85919172284STrond Myklebust { 86019172284STrond Myklebust struct gss_pipe *p; 86119172284STrond Myklebust int err = -ENOMEM; 86219172284STrond Myklebust 86319172284STrond Myklebust p = kmalloc(sizeof(*p), GFP_KERNEL); 86419172284STrond Myklebust if (p == NULL) 86519172284STrond Myklebust goto err; 86619172284STrond Myklebust p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 86719172284STrond Myklebust if (IS_ERR(p->pipe)) { 86819172284STrond Myklebust err = PTR_ERR(p->pipe); 86919172284STrond Myklebust goto err_free_gss_pipe; 87019172284STrond Myklebust } 87119172284STrond Myklebust p->name = name; 87219172284STrond Myklebust p->clnt = clnt; 873414a6295STrond Myklebust kref_init(&p->kref); 87419172284STrond Myklebust rpc_init_pipe_dir_object(&p->pdo, 87519172284STrond Myklebust &gss_pipe_dir_object_ops, 87619172284STrond Myklebust p); 87719172284STrond Myklebust return p; 87819172284STrond Myklebust err_free_gss_pipe: 87919172284STrond Myklebust kfree(p); 8806b2fddd3STrond Myklebust err: 88119172284STrond Myklebust return ERR_PTR(err); 882ccdc28f8SStanislav Kinsbursky } 883ccdc28f8SStanislav Kinsbursky 884414a6295STrond Myklebust struct gss_alloc_pdo { 885414a6295STrond Myklebust struct rpc_clnt *clnt; 886414a6295STrond Myklebust const char *name; 887414a6295STrond Myklebust const struct rpc_pipe_ops *upcall_ops; 888414a6295STrond Myklebust }; 889414a6295STrond Myklebust 890414a6295STrond Myklebust static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) 891414a6295STrond Myklebust { 892414a6295STrond Myklebust struct gss_pipe *gss_pipe; 893414a6295STrond Myklebust struct gss_alloc_pdo *args = data; 894414a6295STrond Myklebust 895414a6295STrond Myklebust if (pdo->pdo_ops != &gss_pipe_dir_object_ops) 896414a6295STrond Myklebust return 0; 897414a6295STrond Myklebust gss_pipe = container_of(pdo, struct gss_pipe, pdo); 898414a6295STrond Myklebust if (strcmp(gss_pipe->name, args->name) != 0) 899414a6295STrond Myklebust return 0; 900414a6295STrond Myklebust if (!kref_get_unless_zero(&gss_pipe->kref)) 901414a6295STrond Myklebust return 0; 902414a6295STrond Myklebust return 1; 903414a6295STrond Myklebust } 904414a6295STrond Myklebust 905414a6295STrond Myklebust static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) 906414a6295STrond Myklebust { 907414a6295STrond Myklebust struct gss_pipe *gss_pipe; 908414a6295STrond Myklebust struct gss_alloc_pdo *args = data; 909414a6295STrond Myklebust 910414a6295STrond Myklebust gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); 911414a6295STrond Myklebust if (!IS_ERR(gss_pipe)) 912414a6295STrond Myklebust return &gss_pipe->pdo; 913414a6295STrond Myklebust return NULL; 914414a6295STrond Myklebust } 915414a6295STrond Myklebust 916414a6295STrond Myklebust static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, 917414a6295STrond Myklebust const char *name, 918414a6295STrond Myklebust const struct rpc_pipe_ops *upcall_ops) 919414a6295STrond Myklebust { 920414a6295STrond Myklebust struct net *net = rpc_net_ns(clnt); 921414a6295STrond Myklebust struct rpc_pipe_dir_object *pdo; 922414a6295STrond Myklebust struct gss_alloc_pdo args = { 923414a6295STrond Myklebust .clnt = clnt, 924414a6295STrond Myklebust .name = name, 925414a6295STrond Myklebust .upcall_ops = upcall_ops, 926414a6295STrond Myklebust }; 927414a6295STrond Myklebust 928414a6295STrond Myklebust pdo = rpc_find_or_alloc_pipe_dir_object(net, 929414a6295STrond Myklebust &clnt->cl_pipedir_objects, 930414a6295STrond Myklebust gss_pipe_match_pdo, 931414a6295STrond Myklebust gss_pipe_alloc_pdo, 932414a6295STrond Myklebust &args); 933414a6295STrond Myklebust if (pdo != NULL) 934414a6295STrond Myklebust return container_of(pdo, struct gss_pipe, pdo); 935414a6295STrond Myklebust return ERR_PTR(-ENOMEM); 936414a6295STrond Myklebust } 937414a6295STrond Myklebust 93819172284STrond Myklebust static void __gss_pipe_free(struct gss_pipe *p) 939ccdc28f8SStanislav Kinsbursky { 94019172284STrond Myklebust struct rpc_clnt *clnt = p->clnt; 94119172284STrond Myklebust struct net *net = rpc_net_ns(clnt); 942ccdc28f8SStanislav Kinsbursky 94319172284STrond Myklebust rpc_remove_pipe_dir_object(net, 94419172284STrond Myklebust &clnt->cl_pipedir_objects, 94519172284STrond Myklebust &p->pdo); 94619172284STrond Myklebust rpc_destroy_pipe_data(p->pipe); 94719172284STrond Myklebust kfree(p); 948ccdc28f8SStanislav Kinsbursky } 949ccdc28f8SStanislav Kinsbursky 950414a6295STrond Myklebust static void __gss_pipe_release(struct kref *kref) 951414a6295STrond Myklebust { 952414a6295STrond Myklebust struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); 953414a6295STrond Myklebust 954414a6295STrond Myklebust __gss_pipe_free(p); 955414a6295STrond Myklebust } 956414a6295STrond Myklebust 95719172284STrond Myklebust static void gss_pipe_free(struct gss_pipe *p) 958ccdc28f8SStanislav Kinsbursky { 95919172284STrond Myklebust if (p != NULL) 960414a6295STrond Myklebust kref_put(&p->kref, __gss_pipe_release); 961ccdc28f8SStanislav Kinsbursky } 962ccdc28f8SStanislav Kinsbursky 9631da177e4SLinus Torvalds /* 9641da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 9651da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 9661da177e4SLinus Torvalds */ 967eb6dc19dSTrond Myklebust static struct gss_auth * 968eb6dc19dSTrond Myklebust gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 9691da177e4SLinus Torvalds { 970c2190661STrond Myklebust rpc_authflavor_t flavor = args->pseudoflavor; 9711da177e4SLinus Torvalds struct gss_auth *gss_auth; 97219172284STrond Myklebust struct gss_pipe *gss_pipe; 9731da177e4SLinus Torvalds struct rpc_auth * auth; 9746a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 9796a19275aSJ. Bruce Fields return ERR_PTR(err); 9801da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 9811da177e4SLinus Torvalds goto out_dec; 982eb6dc19dSTrond Myklebust INIT_HLIST_NODE(&gss_auth->hash); 983bd4a3eb1STrond Myklebust gss_auth->target_name = NULL; 984c2190661STrond Myklebust if (args->target_name) { 985c2190661STrond Myklebust gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); 986bd4a3eb1STrond Myklebust if (gss_auth->target_name == NULL) 987bd4a3eb1STrond Myklebust goto err_free; 988bd4a3eb1STrond Myklebust } 9891da177e4SLinus Torvalds gss_auth->client = clnt; 990e726340aSTrond Myklebust gss_auth->net = get_net(rpc_net_ns(clnt)); 9916a19275aSJ. Bruce Fields err = -EINVAL; 9921da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 9931da177e4SLinus Torvalds if (!gss_auth->mech) { 9949b1d75b7STrond Myklebust dprintk("RPC: Pseudoflavor %d not found!\n", flavor); 995e726340aSTrond Myklebust goto err_put_net; 9961da177e4SLinus Torvalds } 9971da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 998438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 999438b6fdeSJ. Bruce Fields goto err_put_mech; 10001da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 10011da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 10021da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 10031da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 10041da177e4SLinus Torvalds auth->au_flavor = flavor; 10051da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 10060285ed1fSTrond Myklebust kref_init(&gss_auth->kref); 10071da177e4SLinus Torvalds 100819172284STrond Myklebust err = rpcauth_init_credcache(auth); 100919172284STrond Myklebust if (err) 101019172284STrond Myklebust goto err_put_mech; 101134769fc4S\"J. Bruce Fields\ /* 101234769fc4S\"J. Bruce Fields\ * Note: if we created the old pipe first, then someone who 101334769fc4S\"J. Bruce Fields\ * examined the directory at the right moment might conclude 101434769fc4S\"J. Bruce Fields\ * that we supported only the old pipe. So we instead create 101534769fc4S\"J. Bruce Fields\ * the new pipe first. 101634769fc4S\"J. Bruce Fields\ */ 1017414a6295STrond Myklebust gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); 101819172284STrond Myklebust if (IS_ERR(gss_pipe)) { 101919172284STrond Myklebust err = PTR_ERR(gss_pipe); 102019172284STrond Myklebust goto err_destroy_credcache; 10216a19275aSJ. Bruce Fields } 102219172284STrond Myklebust gss_auth->gss_pipe[1] = gss_pipe; 10231da177e4SLinus Torvalds 1024414a6295STrond Myklebust gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, 102519172284STrond Myklebust &gss_upcall_ops_v0); 102619172284STrond Myklebust if (IS_ERR(gss_pipe)) { 102719172284STrond Myklebust err = PTR_ERR(gss_pipe); 1028c239d83bSStanislav Kinsbursky goto err_destroy_pipe_1; 1029c239d83bSStanislav Kinsbursky } 103019172284STrond Myklebust gss_auth->gss_pipe[0] = gss_pipe; 103107a2bf1dSTrond Myklebust 1032eb6dc19dSTrond Myklebust return gss_auth; 1033c239d83bSStanislav Kinsbursky err_destroy_pipe_1: 1034414a6295STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 103519172284STrond Myklebust err_destroy_credcache: 103619172284STrond Myklebust rpcauth_destroy_credcache(auth); 10371da177e4SLinus Torvalds err_put_mech: 10381da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 1039e726340aSTrond Myklebust err_put_net: 1040e726340aSTrond Myklebust put_net(gss_auth->net); 10411da177e4SLinus Torvalds err_free: 1042bd4a3eb1STrond Myklebust kfree(gss_auth->target_name); 10431da177e4SLinus Torvalds kfree(gss_auth); 10441da177e4SLinus Torvalds out_dec: 10451da177e4SLinus Torvalds module_put(THIS_MODULE); 10466a19275aSJ. Bruce Fields return ERR_PTR(err); 10471da177e4SLinus Torvalds } 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds static void 10500285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 10510285ed1fSTrond Myklebust { 105219172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[0]); 105319172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 10540285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 1055e726340aSTrond Myklebust put_net(gss_auth->net); 1056bd4a3eb1STrond Myklebust kfree(gss_auth->target_name); 10570285ed1fSTrond Myklebust 10580285ed1fSTrond Myklebust kfree(gss_auth); 10590285ed1fSTrond Myklebust module_put(THIS_MODULE); 10600285ed1fSTrond Myklebust } 10610285ed1fSTrond Myklebust 10620285ed1fSTrond Myklebust static void 10630285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 10640285ed1fSTrond Myklebust { 10650285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 10660285ed1fSTrond Myklebust 10670285ed1fSTrond Myklebust gss_free(gss_auth); 10680285ed1fSTrond Myklebust } 10690285ed1fSTrond Myklebust 10700285ed1fSTrond Myklebust static void 10711da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 10721da177e4SLinus Torvalds { 107319172284STrond Myklebust struct gss_auth *gss_auth = container_of(auth, 107419172284STrond Myklebust struct gss_auth, rpc_auth); 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 10771da177e4SLinus Torvalds auth, auth->au_flavor); 10781da177e4SLinus Torvalds 1079eb6dc19dSTrond Myklebust if (hash_hashed(&gss_auth->hash)) { 1080eb6dc19dSTrond Myklebust spin_lock(&gss_auth_hash_lock); 1081eb6dc19dSTrond Myklebust hash_del(&gss_auth->hash); 1082eb6dc19dSTrond Myklebust spin_unlock(&gss_auth_hash_lock); 1083eb6dc19dSTrond Myklebust } 1084eb6dc19dSTrond Myklebust 108519172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[0]); 108619172284STrond Myklebust gss_auth->gss_pipe[0] = NULL; 108719172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 108819172284STrond Myklebust gss_auth->gss_pipe[1] = NULL; 10893ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 10903ab9bb72STrond Myklebust 10910285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 10921da177e4SLinus Torvalds } 10931da177e4SLinus Torvalds 1094a0f6ed8eSJ. Bruce Fields /* 1095a0f6ed8eSJ. Bruce Fields * Auths may be shared between rpc clients that were cloned from a 1096a0f6ed8eSJ. Bruce Fields * common client with the same xprt, if they also share the flavor and 1097a0f6ed8eSJ. Bruce Fields * target_name. 1098a0f6ed8eSJ. Bruce Fields * 1099a0f6ed8eSJ. Bruce Fields * The auth is looked up from the oldest parent sharing the same 1100a0f6ed8eSJ. Bruce Fields * cl_xprt, and the auth itself references only that common parent 1101a0f6ed8eSJ. Bruce Fields * (which is guaranteed to last as long as any of its descendants). 1102a0f6ed8eSJ. Bruce Fields */ 1103eb6dc19dSTrond Myklebust static struct gss_auth * 1104eb6dc19dSTrond Myklebust gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args, 1105eb6dc19dSTrond Myklebust struct rpc_clnt *clnt, 1106eb6dc19dSTrond Myklebust struct gss_auth *new) 1107eb6dc19dSTrond Myklebust { 1108eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1109eb6dc19dSTrond Myklebust unsigned long hashval = (unsigned long)clnt; 1110eb6dc19dSTrond Myklebust 1111eb6dc19dSTrond Myklebust spin_lock(&gss_auth_hash_lock); 1112eb6dc19dSTrond Myklebust hash_for_each_possible(gss_auth_hash_table, 1113eb6dc19dSTrond Myklebust gss_auth, 1114eb6dc19dSTrond Myklebust hash, 1115eb6dc19dSTrond Myklebust hashval) { 1116a0f6ed8eSJ. Bruce Fields if (gss_auth->client != clnt) 1117a0f6ed8eSJ. Bruce Fields continue; 1118eb6dc19dSTrond Myklebust if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) 1119eb6dc19dSTrond Myklebust continue; 1120eb6dc19dSTrond Myklebust if (gss_auth->target_name != args->target_name) { 1121eb6dc19dSTrond Myklebust if (gss_auth->target_name == NULL) 1122eb6dc19dSTrond Myklebust continue; 1123eb6dc19dSTrond Myklebust if (args->target_name == NULL) 1124eb6dc19dSTrond Myklebust continue; 1125eb6dc19dSTrond Myklebust if (strcmp(gss_auth->target_name, args->target_name)) 1126eb6dc19dSTrond Myklebust continue; 1127eb6dc19dSTrond Myklebust } 1128eb6dc19dSTrond Myklebust if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count)) 1129eb6dc19dSTrond Myklebust continue; 1130eb6dc19dSTrond Myklebust goto out; 1131eb6dc19dSTrond Myklebust } 1132eb6dc19dSTrond Myklebust if (new) 1133eb6dc19dSTrond Myklebust hash_add(gss_auth_hash_table, &new->hash, hashval); 1134eb6dc19dSTrond Myklebust gss_auth = new; 1135eb6dc19dSTrond Myklebust out: 1136eb6dc19dSTrond Myklebust spin_unlock(&gss_auth_hash_lock); 1137eb6dc19dSTrond Myklebust return gss_auth; 1138eb6dc19dSTrond Myklebust } 1139eb6dc19dSTrond Myklebust 1140eb6dc19dSTrond Myklebust static struct gss_auth * 1141eb6dc19dSTrond Myklebust gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 1142eb6dc19dSTrond Myklebust { 1143eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1144eb6dc19dSTrond Myklebust struct gss_auth *new; 1145eb6dc19dSTrond Myklebust 1146eb6dc19dSTrond Myklebust gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); 1147eb6dc19dSTrond Myklebust if (gss_auth != NULL) 1148eb6dc19dSTrond Myklebust goto out; 1149eb6dc19dSTrond Myklebust new = gss_create_new(args, clnt); 1150eb6dc19dSTrond Myklebust if (IS_ERR(new)) 1151eb6dc19dSTrond Myklebust return new; 1152eb6dc19dSTrond Myklebust gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); 1153eb6dc19dSTrond Myklebust if (gss_auth != new) 1154eb6dc19dSTrond Myklebust gss_destroy(&new->rpc_auth); 1155eb6dc19dSTrond Myklebust out: 1156eb6dc19dSTrond Myklebust return gss_auth; 1157eb6dc19dSTrond Myklebust } 1158eb6dc19dSTrond Myklebust 1159eb6dc19dSTrond Myklebust static struct rpc_auth * 1160eb6dc19dSTrond Myklebust gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 1161eb6dc19dSTrond Myklebust { 1162eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1163eb6dc19dSTrond Myklebust struct rpc_xprt *xprt = rcu_access_pointer(clnt->cl_xprt); 1164eb6dc19dSTrond Myklebust 1165eb6dc19dSTrond Myklebust while (clnt != clnt->cl_parent) { 1166eb6dc19dSTrond Myklebust struct rpc_clnt *parent = clnt->cl_parent; 1167eb6dc19dSTrond Myklebust /* Find the original parent for this transport */ 1168eb6dc19dSTrond Myklebust if (rcu_access_pointer(parent->cl_xprt) != xprt) 1169eb6dc19dSTrond Myklebust break; 1170eb6dc19dSTrond Myklebust clnt = parent; 1171eb6dc19dSTrond Myklebust } 1172eb6dc19dSTrond Myklebust 1173eb6dc19dSTrond Myklebust gss_auth = gss_create_hashed(args, clnt); 1174eb6dc19dSTrond Myklebust if (IS_ERR(gss_auth)) 1175eb6dc19dSTrond Myklebust return ERR_CAST(gss_auth); 1176eb6dc19dSTrond Myklebust return &gss_auth->rpc_auth; 1177eb6dc19dSTrond Myklebust } 1178eb6dc19dSTrond Myklebust 11790df7fb74STrond Myklebust /* 11800df7fb74STrond Myklebust * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 11810df7fb74STrond Myklebust * to the server with the GSS control procedure field set to 11820df7fb74STrond Myklebust * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 11830df7fb74STrond Myklebust * all RPCSEC_GSS state associated with that context. 11840df7fb74STrond Myklebust */ 11850df7fb74STrond Myklebust static int 11860df7fb74STrond Myklebust gss_destroying_context(struct rpc_cred *cred) 11870df7fb74STrond Myklebust { 11880df7fb74STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 11890df7fb74STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 11900df7fb74STrond Myklebust struct rpc_task *task; 11910df7fb74STrond Myklebust 11920df7fb74STrond Myklebust if (gss_cred->gc_ctx == NULL || 11936dcd3926SJeff Layton test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 11940df7fb74STrond Myklebust return 0; 11950df7fb74STrond Myklebust 11960df7fb74STrond Myklebust gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 11970df7fb74STrond Myklebust cred->cr_ops = &gss_nullops; 11980df7fb74STrond Myklebust 11990df7fb74STrond Myklebust /* Take a reference to ensure the cred will be destroyed either 12000df7fb74STrond Myklebust * by the RPC call or by the put_rpccred() below */ 12010df7fb74STrond Myklebust get_rpccred(cred); 12020df7fb74STrond Myklebust 1203080a1f14STrond Myklebust task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 12040df7fb74STrond Myklebust if (!IS_ERR(task)) 12050df7fb74STrond Myklebust rpc_put_task(task); 12060df7fb74STrond Myklebust 12070df7fb74STrond Myklebust put_rpccred(cred); 12080df7fb74STrond Myklebust return 1; 12090df7fb74STrond Myklebust } 12100df7fb74STrond Myklebust 12110df7fb74STrond Myklebust /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 12121da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 12131da177e4SLinus Torvalds * allocated before freeing them. */ 12141da177e4SLinus Torvalds static void 12155d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 12161da177e4SLinus Torvalds { 1217632f0d05SChuck Lever dprintk("RPC: %s\n", __func__); 12181da177e4SLinus Torvalds 12190d8a3746STrond Myklebust gss_delete_sec_context(&ctx->gc_gss_ctx); 12201da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 12211da177e4SLinus Torvalds kfree(ctx); 12221da177e4SLinus Torvalds } 12231da177e4SLinus Torvalds 12241da177e4SLinus Torvalds static void 12255d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 12265d28dc82STrond Myklebust { 12275d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 12285d28dc82STrond Myklebust gss_do_free_ctx(ctx); 12295d28dc82STrond Myklebust } 12305d28dc82STrond Myklebust 12315d28dc82STrond Myklebust static void 12325d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 12335d28dc82STrond Myklebust { 12345d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 12355d28dc82STrond Myklebust } 12365d28dc82STrond Myklebust 12375d28dc82STrond Myklebust static void 123831be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 12391da177e4SLinus Torvalds { 1240632f0d05SChuck Lever dprintk("RPC: %s cred=%p\n", __func__, gss_cred); 124131be5bf1STrond Myklebust kfree(gss_cred); 124231be5bf1STrond Myklebust } 12431da177e4SLinus Torvalds 124431be5bf1STrond Myklebust static void 124531be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 124631be5bf1STrond Myklebust { 124731be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 124831be5bf1STrond Myklebust gss_free_cred(gss_cred); 124931be5bf1STrond Myklebust } 12501da177e4SLinus Torvalds 125131be5bf1STrond Myklebust static void 12526dcd3926SJeff Layton gss_destroy_nullcred(struct rpc_cred *cred) 125331be5bf1STrond Myklebust { 12545d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 12550285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 12565d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 12575d28dc82STrond Myklebust 1258a9b3cd7fSStephen Hemminger RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); 125931be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 12605d28dc82STrond Myklebust if (ctx) 12615d28dc82STrond Myklebust gss_put_ctx(ctx); 12620285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 12631da177e4SLinus Torvalds } 12641da177e4SLinus Torvalds 12656dcd3926SJeff Layton static void 12666dcd3926SJeff Layton gss_destroy_cred(struct rpc_cred *cred) 12676dcd3926SJeff Layton { 12686dcd3926SJeff Layton 12696dcd3926SJeff Layton if (gss_destroying_context(cred)) 12706dcd3926SJeff Layton return; 12716dcd3926SJeff Layton gss_destroy_nullcred(cred); 12726dcd3926SJeff Layton } 12736dcd3926SJeff Layton 12741da177e4SLinus Torvalds /* 12751da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 12761da177e4SLinus Torvalds */ 12771da177e4SLinus Torvalds static struct rpc_cred * 12788a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 12791da177e4SLinus Torvalds { 12808a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 12811da177e4SLinus Torvalds } 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds static struct rpc_cred * 12848a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 12851da177e4SLinus Torvalds { 12861da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 12871da177e4SLinus Torvalds struct gss_cred *cred = NULL; 12881da177e4SLinus Torvalds int err = -ENOMEM; 12891da177e4SLinus Torvalds 1290632f0d05SChuck Lever dprintk("RPC: %s for uid %d, flavor %d\n", 1291cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, acred->uid), 1292cdba321eSEric W. Biederman auth->au_flavor); 12931da177e4SLinus Torvalds 12940f38b873STrond Myklebust if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 12951da177e4SLinus Torvalds goto out_err; 12961da177e4SLinus Torvalds 12975fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 12981da177e4SLinus Torvalds /* 12991da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 13001da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 13011da177e4SLinus Torvalds */ 1302fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 13031da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 130468c97153STrond Myklebust cred->gc_principal = NULL; 130568c97153STrond Myklebust if (acred->machine_cred) 130668c97153STrond Myklebust cred->gc_principal = acred->principal; 13070285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 13081da177e4SLinus Torvalds return &cred->gc_base; 13091da177e4SLinus Torvalds 13101da177e4SLinus Torvalds out_err: 1311632f0d05SChuck Lever dprintk("RPC: %s failed with error %d\n", __func__, err); 13121da177e4SLinus Torvalds return ERR_PTR(err); 13131da177e4SLinus Torvalds } 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds static int 1316fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 1317fba3bad4STrond Myklebust { 1318fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 1319fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 1320fba3bad4STrond Myklebust int err; 1321fba3bad4STrond Myklebust 1322fba3bad4STrond Myklebust do { 1323fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 1324fba3bad4STrond Myklebust } while (err == -EAGAIN); 1325fba3bad4STrond Myklebust return err; 1326fba3bad4STrond Myklebust } 1327fba3bad4STrond Myklebust 13284de6caa2SAndy Adamson /* 13294de6caa2SAndy Adamson * Returns -EACCES if GSS context is NULL or will expire within the 13304de6caa2SAndy Adamson * timeout (miliseconds) 13314de6caa2SAndy Adamson */ 13324de6caa2SAndy Adamson static int 13334de6caa2SAndy Adamson gss_key_timeout(struct rpc_cred *rc) 13344de6caa2SAndy Adamson { 13354de6caa2SAndy Adamson struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 13364de6caa2SAndy Adamson unsigned long now = jiffies; 13374de6caa2SAndy Adamson unsigned long expire; 13384de6caa2SAndy Adamson 13394de6caa2SAndy Adamson if (gss_cred->gc_ctx == NULL) 13404de6caa2SAndy Adamson return -EACCES; 13414de6caa2SAndy Adamson 13424de6caa2SAndy Adamson expire = gss_cred->gc_ctx->gc_expiry - (gss_key_expire_timeo * HZ); 13434de6caa2SAndy Adamson 13444de6caa2SAndy Adamson if (time_after(now, expire)) 13454de6caa2SAndy Adamson return -EACCES; 13464de6caa2SAndy Adamson return 0; 13474de6caa2SAndy Adamson } 13484de6caa2SAndy Adamson 1349fba3bad4STrond Myklebust static int 13508a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 13511da177e4SLinus Torvalds { 13521da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 13534de6caa2SAndy Adamson int ret; 13541da177e4SLinus Torvalds 1355cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 13568a317760STrond Myklebust goto out; 13571da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 1358cd019f75STrond Myklebust if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 1359cd019f75STrond Myklebust return 0; 1360cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 13611da177e4SLinus Torvalds return 0; 13628a317760STrond Myklebust out: 136368c97153STrond Myklebust if (acred->principal != NULL) { 136468c97153STrond Myklebust if (gss_cred->gc_principal == NULL) 136568c97153STrond Myklebust return 0; 13664de6caa2SAndy Adamson ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; 13674de6caa2SAndy Adamson goto check_expire; 136868c97153STrond Myklebust } 136968c97153STrond Myklebust if (gss_cred->gc_principal != NULL) 13707c67db3aSTrond Myklebust return 0; 13714de6caa2SAndy Adamson ret = uid_eq(rc->cr_uid, acred->uid); 13724de6caa2SAndy Adamson 13734de6caa2SAndy Adamson check_expire: 13744de6caa2SAndy Adamson if (ret == 0) 13754de6caa2SAndy Adamson return ret; 13764de6caa2SAndy Adamson 13774de6caa2SAndy Adamson /* Notify acred users of GSS context expiration timeout */ 13784de6caa2SAndy Adamson if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) && 13794de6caa2SAndy Adamson (gss_key_timeout(rc) != 0)) { 13804de6caa2SAndy Adamson /* test will now be done from generic cred */ 13814de6caa2SAndy Adamson test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags); 13824de6caa2SAndy Adamson /* tell NFS layer that key will expire soon */ 13834de6caa2SAndy Adamson set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags); 13844de6caa2SAndy Adamson } 13854de6caa2SAndy Adamson return ret; 13861da177e4SLinus Torvalds } 13871da177e4SLinus Torvalds 13881da177e4SLinus Torvalds /* 13891da177e4SLinus Torvalds * Marshal credentials. 13901da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 13911da177e4SLinus Torvalds */ 1392d8ed029dSAlexey Dobriyan static __be32 * 1393d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 13941da177e4SLinus Torvalds { 1395a17c2153STrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 1396a17c2153STrond Myklebust struct rpc_cred *cred = req->rq_cred; 13971da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 13981da177e4SLinus Torvalds gc_base); 13991da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1400d8ed029dSAlexey Dobriyan __be32 *cred_len; 14011da177e4SLinus Torvalds u32 maj_stat = 0; 14021da177e4SLinus Torvalds struct xdr_netobj mic; 14031da177e4SLinus Torvalds struct kvec iov; 14041da177e4SLinus Torvalds struct xdr_buf verf_buf; 14051da177e4SLinus Torvalds 1406632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 14071da177e4SLinus Torvalds 14081da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 14091da177e4SLinus Torvalds cred_len = p++; 14101da177e4SLinus Torvalds 14111da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 14121da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 14131da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 14141da177e4SLinus Torvalds 14151da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 14161da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 14171da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 14181da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 14191da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 14201da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 14211da177e4SLinus Torvalds 14221da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 14231da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 1424a4f0835cSTrond Myklebust iov.iov_base = xprt_skip_transport_header(req->rq_xprt, 1425808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 14261da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 14271da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 14281da177e4SLinus Torvalds 14291da177e4SLinus Torvalds /* set verifier flavor*/ 14301da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 14311da177e4SLinus Torvalds 14321da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 143300fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 14341da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 1435fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 14361da177e4SLinus Torvalds } else if (maj_stat != 0) { 14371da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 14381da177e4SLinus Torvalds goto out_put_ctx; 14391da177e4SLinus Torvalds } 14401da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 14411da177e4SLinus Torvalds gss_put_ctx(ctx); 14421da177e4SLinus Torvalds return p; 14431da177e4SLinus Torvalds out_put_ctx: 14441da177e4SLinus Torvalds gss_put_ctx(ctx); 14451da177e4SLinus Torvalds return NULL; 14461da177e4SLinus Torvalds } 14471da177e4SLinus Torvalds 1448cd019f75STrond Myklebust static int gss_renew_cred(struct rpc_task *task) 1449cd019f75STrond Myklebust { 1450a17c2153STrond Myklebust struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; 1451cd019f75STrond Myklebust struct gss_cred *gss_cred = container_of(oldcred, 1452cd019f75STrond Myklebust struct gss_cred, 1453cd019f75STrond Myklebust gc_base); 1454cd019f75STrond Myklebust struct rpc_auth *auth = oldcred->cr_auth; 1455cd019f75STrond Myklebust struct auth_cred acred = { 1456cd019f75STrond Myklebust .uid = oldcred->cr_uid, 145768c97153STrond Myklebust .principal = gss_cred->gc_principal, 145868c97153STrond Myklebust .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), 1459cd019f75STrond Myklebust }; 1460cd019f75STrond Myklebust struct rpc_cred *new; 1461cd019f75STrond Myklebust 1462cd019f75STrond Myklebust new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 1463cd019f75STrond Myklebust if (IS_ERR(new)) 1464cd019f75STrond Myklebust return PTR_ERR(new); 1465a17c2153STrond Myklebust task->tk_rqstp->rq_cred = new; 1466cd019f75STrond Myklebust put_rpccred(oldcred); 1467cd019f75STrond Myklebust return 0; 1468cd019f75STrond Myklebust } 1469cd019f75STrond Myklebust 1470126e216aSTrond Myklebust static int gss_cred_is_negative_entry(struct rpc_cred *cred) 1471126e216aSTrond Myklebust { 1472126e216aSTrond Myklebust if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { 1473126e216aSTrond Myklebust unsigned long now = jiffies; 1474126e216aSTrond Myklebust unsigned long begin, expire; 1475126e216aSTrond Myklebust struct gss_cred *gss_cred; 1476126e216aSTrond Myklebust 1477126e216aSTrond Myklebust gss_cred = container_of(cred, struct gss_cred, gc_base); 1478126e216aSTrond Myklebust begin = gss_cred->gc_upcall_timestamp; 1479126e216aSTrond Myklebust expire = begin + gss_expired_cred_retry_delay * HZ; 1480126e216aSTrond Myklebust 1481126e216aSTrond Myklebust if (time_in_range_open(now, begin, expire)) 1482126e216aSTrond Myklebust return 1; 1483126e216aSTrond Myklebust } 1484126e216aSTrond Myklebust return 0; 1485126e216aSTrond Myklebust } 1486126e216aSTrond Myklebust 14871da177e4SLinus Torvalds /* 14881da177e4SLinus Torvalds * Refresh credentials. XXX - finish 14891da177e4SLinus Torvalds */ 14901da177e4SLinus Torvalds static int 14911da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 14921da177e4SLinus Torvalds { 1493a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 1494cd019f75STrond Myklebust int ret = 0; 14951da177e4SLinus Torvalds 1496126e216aSTrond Myklebust if (gss_cred_is_negative_entry(cred)) 1497126e216aSTrond Myklebust return -EKEYEXPIRED; 1498126e216aSTrond Myklebust 1499cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 1500cd019f75STrond Myklebust !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 1501cd019f75STrond Myklebust ret = gss_renew_cred(task); 1502cd019f75STrond Myklebust if (ret < 0) 1503cd019f75STrond Myklebust goto out; 1504a17c2153STrond Myklebust cred = task->tk_rqstp->rq_cred; 1505cd019f75STrond Myklebust } 1506cd019f75STrond Myklebust 1507cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 1508cd019f75STrond Myklebust ret = gss_refresh_upcall(task); 1509cd019f75STrond Myklebust out: 1510cd019f75STrond Myklebust return ret; 15111da177e4SLinus Torvalds } 15121da177e4SLinus Torvalds 15130df7fb74STrond Myklebust /* Dummy refresh routine: used only when destroying the context */ 15140df7fb74STrond Myklebust static int 15150df7fb74STrond Myklebust gss_refresh_null(struct rpc_task *task) 15160df7fb74STrond Myklebust { 1517c297c8b9SAndy Adamson return 0; 15180df7fb74STrond Myklebust } 15190df7fb74STrond Myklebust 1520d8ed029dSAlexey Dobriyan static __be32 * 1521d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 15221da177e4SLinus Torvalds { 1523a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 15241da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1525d8ed029dSAlexey Dobriyan __be32 seq; 15261da177e4SLinus Torvalds struct kvec iov; 15271da177e4SLinus Torvalds struct xdr_buf verf_buf; 15281da177e4SLinus Torvalds struct xdr_netobj mic; 15291da177e4SLinus Torvalds u32 flav,len; 15301da177e4SLinus Torvalds u32 maj_stat; 153135fa5f7bSAndy Adamson __be32 *ret = ERR_PTR(-EIO); 15321da177e4SLinus Torvalds 1533632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds flav = ntohl(*p++); 15361da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 15371da177e4SLinus Torvalds goto out_bad; 15381da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 15391da177e4SLinus Torvalds goto out_bad; 15401da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 15411da177e4SLinus Torvalds iov.iov_base = &seq; 15421da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 15431da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 15441da177e4SLinus Torvalds mic.data = (u8 *)p; 15451da177e4SLinus Torvalds mic.len = len; 15461da177e4SLinus Torvalds 154735fa5f7bSAndy Adamson ret = ERR_PTR(-EACCES); 154800fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 15491da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1550fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 15510df7fb74STrond Myklebust if (maj_stat) { 1552632f0d05SChuck Lever dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", 1553632f0d05SChuck Lever task->tk_pid, __func__, maj_stat); 15541da177e4SLinus Torvalds goto out_bad; 15550df7fb74STrond Myklebust } 155624b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 155724b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 15581be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 15591da177e4SLinus Torvalds gss_put_ctx(ctx); 1560632f0d05SChuck Lever dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", 1561632f0d05SChuck Lever task->tk_pid, __func__); 15621da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 15631da177e4SLinus Torvalds out_bad: 15641da177e4SLinus Torvalds gss_put_ctx(ctx); 156535fa5f7bSAndy Adamson dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, 156635fa5f7bSAndy Adamson PTR_ERR(ret)); 156735fa5f7bSAndy Adamson return ret; 15681da177e4SLinus Torvalds } 15691da177e4SLinus Torvalds 15709f06c719SChuck Lever static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, 15719f06c719SChuck Lever __be32 *p, void *obj) 15729f06c719SChuck Lever { 15739f06c719SChuck Lever struct xdr_stream xdr; 15749f06c719SChuck Lever 15759f06c719SChuck Lever xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); 15769f06c719SChuck Lever encode(rqstp, &xdr, obj); 15779f06c719SChuck Lever } 15789f06c719SChuck Lever 15791da177e4SLinus Torvalds static inline int 15801da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 15819f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 15829f06c719SChuck Lever __be32 *p, void *obj) 15831da177e4SLinus Torvalds { 15841da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 15851da177e4SLinus Torvalds struct xdr_buf integ_buf; 1586d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 15871da177e4SLinus Torvalds struct xdr_netobj mic; 1588d8ed029dSAlexey Dobriyan u32 offset; 1589d8ed029dSAlexey Dobriyan __be32 *q; 15901da177e4SLinus Torvalds struct kvec *iov; 15911da177e4SLinus Torvalds u32 maj_stat = 0; 15921da177e4SLinus Torvalds int status = -EIO; 15931da177e4SLinus Torvalds 15941da177e4SLinus Torvalds integ_len = p++; 15951da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 15961da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 15971da177e4SLinus Torvalds 15989f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 15991da177e4SLinus Torvalds 16001da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 16011da177e4SLinus Torvalds offset, snd_buf->len - offset)) 16021da177e4SLinus Torvalds return status; 16031da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 16061da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 16071da177e4SLinus Torvalds iov = snd_buf->tail; 16081da177e4SLinus Torvalds else 16091da177e4SLinus Torvalds iov = snd_buf->head; 16101da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 16111da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 16121da177e4SLinus Torvalds 161300fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 16141da177e4SLinus Torvalds status = -EIO; /* XXX? */ 16151da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1616fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 16171da177e4SLinus Torvalds else if (maj_stat) 16181da177e4SLinus Torvalds return status; 16191da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 16221da177e4SLinus Torvalds iov->iov_len += offset; 16231da177e4SLinus Torvalds snd_buf->len += offset; 16241da177e4SLinus Torvalds return 0; 16251da177e4SLinus Torvalds } 16261da177e4SLinus Torvalds 16272d2da60cSJ. Bruce Fields static void 16282d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 16292d2da60cSJ. Bruce Fields { 16302d2da60cSJ. Bruce Fields int i; 16312d2da60cSJ. Bruce Fields 16322d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 16332d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 16342d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 16352d2da60cSJ. Bruce Fields } 16362d2da60cSJ. Bruce Fields 16372d2da60cSJ. Bruce Fields static int 16382d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 16392d2da60cSJ. Bruce Fields { 16402d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 16412d2da60cSJ. Bruce Fields int first, last, i; 16422d2da60cSJ. Bruce Fields 16432d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 16442d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 16452d2da60cSJ. Bruce Fields return 0; 16462d2da60cSJ. Bruce Fields } 16472d2da60cSJ. Bruce Fields 16482d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 16492d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 16502d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 16512d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 16522d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 16532d2da60cSJ. Bruce Fields GFP_NOFS); 16542d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 16552d2da60cSJ. Bruce Fields goto out; 16562d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 16572d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 16582d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 16592d2da60cSJ. Bruce Fields goto out_free; 16602d2da60cSJ. Bruce Fields } 16612d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 16622d2da60cSJ. Bruce Fields return 0; 16632d2da60cSJ. Bruce Fields out_free: 1664cdead7cfSTrond Myklebust rqstp->rq_enc_pages_num = i; 1665cdead7cfSTrond Myklebust priv_release_snd_buf(rqstp); 16662d2da60cSJ. Bruce Fields out: 16672d2da60cSJ. Bruce Fields return -EAGAIN; 16682d2da60cSJ. Bruce Fields } 16692d2da60cSJ. Bruce Fields 16702d2da60cSJ. Bruce Fields static inline int 16712d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 16729f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 16739f06c719SChuck Lever __be32 *p, void *obj) 16742d2da60cSJ. Bruce Fields { 16752d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 16762d2da60cSJ. Bruce Fields u32 offset; 16772d2da60cSJ. Bruce Fields u32 maj_stat; 16782d2da60cSJ. Bruce Fields int status; 1679d8ed029dSAlexey Dobriyan __be32 *opaque_len; 16802d2da60cSJ. Bruce Fields struct page **inpages; 16812d2da60cSJ. Bruce Fields int first; 16822d2da60cSJ. Bruce Fields int pad; 16832d2da60cSJ. Bruce Fields struct kvec *iov; 16842d2da60cSJ. Bruce Fields char *tmp; 16852d2da60cSJ. Bruce Fields 16862d2da60cSJ. Bruce Fields opaque_len = p++; 16872d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 16882d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 16892d2da60cSJ. Bruce Fields 16909f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 16912d2da60cSJ. Bruce Fields 16922d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 16932d2da60cSJ. Bruce Fields if (status) 16942d2da60cSJ. Bruce Fields return status; 16952d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 16962d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 16972d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 16982d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 16997561042fSKevin Coffman /* 17007561042fSKevin Coffman * Give the tail its own page, in case we need extra space in the 17017561042fSKevin Coffman * head when wrapping: 17027561042fSKevin Coffman * 17037561042fSKevin Coffman * call_allocate() allocates twice the slack space required 17047561042fSKevin Coffman * by the authentication flavor to rq_callsize. 17057561042fSKevin Coffman * For GSS, slack is GSS_CRED_SLACK. 17067561042fSKevin Coffman */ 17072d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 17082d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 17092d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 17102d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 17112d2da60cSJ. Bruce Fields } 171200fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 17137561042fSKevin Coffman /* slack space should prevent this ever happening: */ 17142d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 17152d2da60cSJ. Bruce Fields status = -EIO; 17162d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 17172d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 17182d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1719fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 17202d2da60cSJ. Bruce Fields else if (maj_stat) 17212d2da60cSJ. Bruce Fields return status; 17222d2da60cSJ. Bruce Fields 17232d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 17242d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 17252d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 17262d2da60cSJ. Bruce Fields iov = snd_buf->tail; 17272d2da60cSJ. Bruce Fields else 17282d2da60cSJ. Bruce Fields iov = snd_buf->head; 17292d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 17302d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 17312d2da60cSJ. Bruce Fields memset(p, 0, pad); 17322d2da60cSJ. Bruce Fields iov->iov_len += pad; 17332d2da60cSJ. Bruce Fields snd_buf->len += pad; 17342d2da60cSJ. Bruce Fields 17352d2da60cSJ. Bruce Fields return 0; 17362d2da60cSJ. Bruce Fields } 17372d2da60cSJ. Bruce Fields 17381da177e4SLinus Torvalds static int 17391da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 17409f06c719SChuck Lever kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) 17411da177e4SLinus Torvalds { 1742a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 17431da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 17441da177e4SLinus Torvalds gc_base); 17451da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 17461da177e4SLinus Torvalds int status = -EIO; 17471da177e4SLinus Torvalds 1748632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 17491da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 17501da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 17511da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 17521da177e4SLinus Torvalds */ 17539f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 17549f06c719SChuck Lever status = 0; 17551da177e4SLinus Torvalds goto out; 17561da177e4SLinus Torvalds } 17571da177e4SLinus Torvalds switch (gss_cred->gc_service) { 17581da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 17599f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 17609f06c719SChuck Lever status = 0; 17611da177e4SLinus Torvalds break; 17621da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 176389f0e4feSJoe Perches status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); 17641da177e4SLinus Torvalds break; 17651da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 176689f0e4feSJoe Perches status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); 17671da177e4SLinus Torvalds break; 17681da177e4SLinus Torvalds } 17691da177e4SLinus Torvalds out: 17701da177e4SLinus Torvalds gss_put_ctx(ctx); 1771632f0d05SChuck Lever dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); 17721da177e4SLinus Torvalds return status; 17731da177e4SLinus Torvalds } 17741da177e4SLinus Torvalds 17751da177e4SLinus Torvalds static inline int 17761da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1777d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 17781da177e4SLinus Torvalds { 17791da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 17801da177e4SLinus Torvalds struct xdr_buf integ_buf; 17811da177e4SLinus Torvalds struct xdr_netobj mic; 17821da177e4SLinus Torvalds u32 data_offset, mic_offset; 17831da177e4SLinus Torvalds u32 integ_len; 17841da177e4SLinus Torvalds u32 maj_stat; 17851da177e4SLinus Torvalds int status = -EIO; 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 17881da177e4SLinus Torvalds if (integ_len & 3) 17891da177e4SLinus Torvalds return status; 17901da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 17911da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 17921da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 17931da177e4SLinus Torvalds return status; 17941da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 17951da177e4SLinus Torvalds return status; 17961da177e4SLinus Torvalds 17971da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 17981da177e4SLinus Torvalds mic_offset - data_offset)) 17991da177e4SLinus Torvalds return status; 18001da177e4SLinus Torvalds 18011da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 18021da177e4SLinus Torvalds return status; 18031da177e4SLinus Torvalds 180400fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 18051da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1806fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 18071da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 18081da177e4SLinus Torvalds return status; 18091da177e4SLinus Torvalds return 0; 18101da177e4SLinus Torvalds } 18111da177e4SLinus Torvalds 18122d2da60cSJ. Bruce Fields static inline int 18132d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1814d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 18152d2da60cSJ. Bruce Fields { 18162d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 18172d2da60cSJ. Bruce Fields u32 offset; 18182d2da60cSJ. Bruce Fields u32 opaque_len; 18192d2da60cSJ. Bruce Fields u32 maj_stat; 18202d2da60cSJ. Bruce Fields int status = -EIO; 18212d2da60cSJ. Bruce Fields 18222d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 18232d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 18242d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 18252d2da60cSJ. Bruce Fields return status; 18262d2da60cSJ. Bruce Fields /* remove padding: */ 18272d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 18282d2da60cSJ. Bruce Fields 182900fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 18302d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1831fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 18322d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 18332d2da60cSJ. Bruce Fields return status; 18342d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 18352d2da60cSJ. Bruce Fields return status; 18362d2da60cSJ. Bruce Fields 18372d2da60cSJ. Bruce Fields return 0; 18382d2da60cSJ. Bruce Fields } 18392d2da60cSJ. Bruce Fields 1840bf269551SChuck Lever static int 1841bf269551SChuck Lever gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, 1842bf269551SChuck Lever __be32 *p, void *obj) 1843bf269551SChuck Lever { 1844bf269551SChuck Lever struct xdr_stream xdr; 1845bf269551SChuck Lever 1846bf269551SChuck Lever xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); 1847bf269551SChuck Lever return decode(rqstp, &xdr, obj); 1848bf269551SChuck Lever } 18492d2da60cSJ. Bruce Fields 18501da177e4SLinus Torvalds static int 18511da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1852bf269551SChuck Lever kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) 18531da177e4SLinus Torvalds { 1854a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 18551da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 18561da177e4SLinus Torvalds gc_base); 18571da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1858d8ed029dSAlexey Dobriyan __be32 *savedp = p; 18592d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 18602d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 18611da177e4SLinus Torvalds int status = -EIO; 18621da177e4SLinus Torvalds 18631da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 18641da177e4SLinus Torvalds goto out_decode; 18651da177e4SLinus Torvalds switch (gss_cred->gc_service) { 18661da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 18671da177e4SLinus Torvalds break; 18681da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 18691da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 18701da177e4SLinus Torvalds if (status) 18711da177e4SLinus Torvalds goto out; 18721da177e4SLinus Torvalds break; 18731da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 18742d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 18752d2da60cSJ. Bruce Fields if (status) 18762d2da60cSJ. Bruce Fields goto out; 18771da177e4SLinus Torvalds break; 18781da177e4SLinus Torvalds } 187924b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 18801be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 18812d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 18821da177e4SLinus Torvalds out_decode: 1883bf269551SChuck Lever status = gss_unwrap_req_decode(decode, rqstp, p, obj); 18841da177e4SLinus Torvalds out: 18851da177e4SLinus Torvalds gss_put_ctx(ctx); 1886632f0d05SChuck Lever dprintk("RPC: %5u %s returning %d\n", 1887632f0d05SChuck Lever task->tk_pid, __func__, status); 18881da177e4SLinus Torvalds return status; 18891da177e4SLinus Torvalds } 18901da177e4SLinus Torvalds 1891f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 18921da177e4SLinus Torvalds .owner = THIS_MODULE, 18931da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 18941da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 18951da177e4SLinus Torvalds .create = gss_create, 18961da177e4SLinus Torvalds .destroy = gss_destroy, 18971da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 189880df9d20SStanislav Kinsbursky .crcreate = gss_create_cred, 18996a1a1e34SChuck Lever .list_pseudoflavors = gss_mech_list_pseudoflavors, 19009568c5e9SChuck Lever .info2flavor = gss_mech_info2flavor, 1901a77c806fSChuck Lever .flavor2info = gss_mech_flavor2info, 19021da177e4SLinus Torvalds }; 19031da177e4SLinus Torvalds 1904f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 19051da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 19061da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1907fba3bad4STrond Myklebust .cr_init = gss_cred_init, 19085c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 19091da177e4SLinus Torvalds .crmatch = gss_match, 19101da177e4SLinus Torvalds .crmarshal = gss_marshal, 19111da177e4SLinus Torvalds .crrefresh = gss_refresh, 19121da177e4SLinus Torvalds .crvalidate = gss_validate, 19131da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 19141da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 19154de6caa2SAndy Adamson .crkey_timeout = gss_key_timeout, 19161da177e4SLinus Torvalds }; 19171da177e4SLinus Torvalds 19180df7fb74STrond Myklebust static const struct rpc_credops gss_nullops = { 19190df7fb74STrond Myklebust .cr_name = "AUTH_GSS", 19206dcd3926SJeff Layton .crdestroy = gss_destroy_nullcred, 19215c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 19220df7fb74STrond Myklebust .crmatch = gss_match, 19230df7fb74STrond Myklebust .crmarshal = gss_marshal, 19240df7fb74STrond Myklebust .crrefresh = gss_refresh_null, 19250df7fb74STrond Myklebust .crvalidate = gss_validate, 19260df7fb74STrond Myklebust .crwrap_req = gss_wrap_req, 19270df7fb74STrond Myklebust .crunwrap_resp = gss_unwrap_resp, 19280df7fb74STrond Myklebust }; 19290df7fb74STrond Myklebust 1930b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0 = { 1931c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 19321da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 19331da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 193434769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v0, 193534769fc4S\"J. Bruce Fields\ .release_pipe = gss_pipe_release, 193634769fc4S\"J. Bruce Fields\ }; 193734769fc4S\"J. Bruce Fields\ 1938b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1 = { 1939c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 194034769fc4S\"J. Bruce Fields\ .downcall = gss_pipe_downcall, 194134769fc4S\"J. Bruce Fields\ .destroy_msg = gss_pipe_destroy_msg, 194234769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v1, 19431da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 19441da177e4SLinus Torvalds }; 19451da177e4SLinus Torvalds 1946a1db410dSStanislav Kinsbursky static __net_init int rpcsec_gss_init_net(struct net *net) 1947a1db410dSStanislav Kinsbursky { 1948a1db410dSStanislav Kinsbursky return gss_svc_init_net(net); 1949a1db410dSStanislav Kinsbursky } 1950a1db410dSStanislav Kinsbursky 1951a1db410dSStanislav Kinsbursky static __net_exit void rpcsec_gss_exit_net(struct net *net) 1952a1db410dSStanislav Kinsbursky { 1953a1db410dSStanislav Kinsbursky gss_svc_shutdown_net(net); 1954a1db410dSStanislav Kinsbursky } 1955a1db410dSStanislav Kinsbursky 1956a1db410dSStanislav Kinsbursky static struct pernet_operations rpcsec_gss_net_ops = { 1957a1db410dSStanislav Kinsbursky .init = rpcsec_gss_init_net, 1958a1db410dSStanislav Kinsbursky .exit = rpcsec_gss_exit_net, 1959a1db410dSStanislav Kinsbursky }; 1960a1db410dSStanislav Kinsbursky 19611da177e4SLinus Torvalds /* 19621da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 19631da177e4SLinus Torvalds */ 19641da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 19651da177e4SLinus Torvalds { 19661da177e4SLinus Torvalds int err = 0; 19671da177e4SLinus Torvalds 19681da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 19691da177e4SLinus Torvalds if (err) 19701da177e4SLinus Torvalds goto out; 19711da177e4SLinus Torvalds err = gss_svc_init(); 19721da177e4SLinus Torvalds if (err) 19731da177e4SLinus Torvalds goto out_unregister; 1974a1db410dSStanislav Kinsbursky err = register_pernet_subsys(&rpcsec_gss_net_ops); 1975a1db410dSStanislav Kinsbursky if (err) 1976a1db410dSStanislav Kinsbursky goto out_svc_exit; 197779a3f20bS\"J. Bruce Fields\ rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); 19781da177e4SLinus Torvalds return 0; 1979a1db410dSStanislav Kinsbursky out_svc_exit: 1980a1db410dSStanislav Kinsbursky gss_svc_shutdown(); 19811da177e4SLinus Torvalds out_unregister: 19821da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 19831da177e4SLinus Torvalds out: 19841da177e4SLinus Torvalds return err; 19851da177e4SLinus Torvalds } 19861da177e4SLinus Torvalds 19871da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 19881da177e4SLinus Torvalds { 1989a1db410dSStanislav Kinsbursky unregister_pernet_subsys(&rpcsec_gss_net_ops); 19901da177e4SLinus Torvalds gss_svc_shutdown(); 19911da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 1992bf12691dSJesper Dangaard Brouer rcu_barrier(); /* Wait for completion of call_rcu()'s */ 19931da177e4SLinus Torvalds } 19941da177e4SLinus Torvalds 199571afa85eSChuck Lever MODULE_ALIAS("rpc-auth-6"); 19961da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1997126e216aSTrond Myklebust module_param_named(expired_cred_retry_delay, 1998126e216aSTrond Myklebust gss_expired_cred_retry_delay, 1999126e216aSTrond Myklebust uint, 0644); 2000126e216aSTrond Myklebust MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " 2001126e216aSTrond Myklebust "the RPC engine retries an expired credential"); 2002126e216aSTrond Myklebust 20034de6caa2SAndy Adamson module_param_named(key_expire_timeo, 20044de6caa2SAndy Adamson gss_key_expire_timeo, 20054de6caa2SAndy Adamson uint, 0644); 20064de6caa2SAndy Adamson MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " 20074de6caa2SAndy Adamson "credential keys lifetime where the NFS layer cleans up " 20084de6caa2SAndy Adamson "prior to key expiration"); 20094de6caa2SAndy Adamson 20101da177e4SLinus Torvalds module_init(init_rpcsec_gss) 20111da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 2012