11da177e4SLinus Torvalds /* 2f30c2269SUwe Zeisberger * linux/net/sunrpc/auth_gss/auth_gss.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * RPCSEC_GSS client authentication. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (c) 2000 The Regents of the University of Michigan. 71da177e4SLinus Torvalds * All rights reserved. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Dug Song <dugsong@monkey.org> 101da177e4SLinus Torvalds * Andy Adamson <andros@umich.edu> 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Redistribution and use in source and binary forms, with or without 131da177e4SLinus Torvalds * modification, are permitted provided that the following conditions 141da177e4SLinus Torvalds * are met: 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * 1. Redistributions of source code must retain the above copyright 171da177e4SLinus Torvalds * notice, this list of conditions and the following disclaimer. 181da177e4SLinus Torvalds * 2. Redistributions in binary form must reproduce the above copyright 191da177e4SLinus Torvalds * notice, this list of conditions and the following disclaimer in the 201da177e4SLinus Torvalds * documentation and/or other materials provided with the distribution. 211da177e4SLinus Torvalds * 3. Neither the name of the University nor the names of its 221da177e4SLinus Torvalds * contributors may be used to endorse or promote products derived 231da177e4SLinus Torvalds * from this software without specific prior written permission. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 261da177e4SLinus Torvalds * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 271da177e4SLinus Torvalds * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 281da177e4SLinus Torvalds * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 291da177e4SLinus Torvalds * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 301da177e4SLinus Torvalds * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 311da177e4SLinus Torvalds * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 321da177e4SLinus Torvalds * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 331da177e4SLinus Torvalds * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 341da177e4SLinus Torvalds * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 351da177e4SLinus Torvalds * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 361da177e4SLinus Torvalds */ 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #include <linux/module.h> 401da177e4SLinus Torvalds #include <linux/init.h> 411da177e4SLinus Torvalds #include <linux/types.h> 421da177e4SLinus Torvalds #include <linux/slab.h> 431da177e4SLinus Torvalds #include <linux/sched.h> 442d2da60cSJ. Bruce Fields #include <linux/pagemap.h> 451da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 461da177e4SLinus Torvalds #include <linux/sunrpc/auth.h> 471da177e4SLinus Torvalds #include <linux/sunrpc/auth_gss.h> 481da177e4SLinus Torvalds #include <linux/sunrpc/svcauth_gss.h> 491da177e4SLinus Torvalds #include <linux/sunrpc/gss_err.h> 501da177e4SLinus Torvalds #include <linux/workqueue.h> 511da177e4SLinus Torvalds #include <linux/sunrpc/rpc_pipe_fs.h> 521da177e4SLinus Torvalds #include <linux/sunrpc/gss_api.h> 531da177e4SLinus Torvalds #include <asm/uaccess.h> 54eb6dc19dSTrond Myklebust #include <linux/hashtable.h> 551da177e4SLinus Torvalds 56abfdbd53STrond Myklebust #include "../netns.h" 57abfdbd53STrond Myklebust 58f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops; 591da177e4SLinus Torvalds 60f1c0a861STrond Myklebust static const struct rpc_credops gss_credops; 610df7fb74STrond Myklebust static const struct rpc_credops gss_nullops; 621da177e4SLinus Torvalds 63126e216aSTrond Myklebust #define GSS_RETRY_EXPIRED 5 64126e216aSTrond Myklebust static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; 65126e216aSTrond Myklebust 664de6caa2SAndy Adamson #define GSS_KEY_EXPIRE_TIMEO 240 674de6caa2SAndy Adamson static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO; 684de6caa2SAndy Adamson 691da177e4SLinus Torvalds #ifdef RPC_DEBUG 701da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_AUTH 711da177e4SLinus Torvalds #endif 721da177e4SLinus Torvalds 73725f2865SKevin Coffman #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) 741da177e4SLinus Torvalds /* length of a krb5 verifier (48), plus data added before arguments when 751da177e4SLinus Torvalds * using integrity (two 4-byte integers): */ 76adeb8133SOlga Kornievskaia #define GSS_VERF_SLACK 100 771da177e4SLinus Torvalds 7823c323afSTrond Myklebust static DEFINE_HASHTABLE(gss_auth_hash_table, 4); 79eb6dc19dSTrond Myklebust static DEFINE_SPINLOCK(gss_auth_hash_lock); 80eb6dc19dSTrond Myklebust 8119172284STrond Myklebust struct gss_pipe { 8219172284STrond Myklebust struct rpc_pipe_dir_object pdo; 8319172284STrond Myklebust struct rpc_pipe *pipe; 8419172284STrond Myklebust struct rpc_clnt *clnt; 8519172284STrond Myklebust const char *name; 86414a6295STrond Myklebust struct kref kref; 8719172284STrond Myklebust }; 8819172284STrond Myklebust 891da177e4SLinus Torvalds struct gss_auth { 900285ed1fSTrond Myklebust struct kref kref; 91eb6dc19dSTrond Myklebust struct hlist_node hash; 921da177e4SLinus Torvalds struct rpc_auth rpc_auth; 931da177e4SLinus Torvalds struct gss_api_mech *mech; 941da177e4SLinus Torvalds enum rpc_gss_svc service; 951da177e4SLinus Torvalds struct rpc_clnt *client; 96e726340aSTrond Myklebust struct net *net; 9734769fc4S\"J. Bruce Fields\ /* 9834769fc4S\"J. Bruce Fields\ * There are two upcall pipes; dentry[1], named "gssd", is used 9934769fc4S\"J. Bruce Fields\ * for the new text-based upcall; dentry[0] is named after the 10034769fc4S\"J. Bruce Fields\ * mechanism (for example, "krb5") and exists for 10134769fc4S\"J. Bruce Fields\ * backwards-compatibility with older gssd's. 10234769fc4S\"J. Bruce Fields\ */ 10319172284STrond Myklebust struct gss_pipe *gss_pipe[2]; 104bd4a3eb1STrond Myklebust const char *target_name; 1051da177e4SLinus Torvalds }; 1061da177e4SLinus Torvalds 10779a3f20bS\"J. Bruce Fields\ /* pipe_version >= 0 if and only if someone has a pipe open. */ 10879a3f20bS\"J. Bruce Fields\ static DEFINE_SPINLOCK(pipe_version_lock); 10979a3f20bS\"J. Bruce Fields\ static struct rpc_wait_queue pipe_version_rpc_waitqueue; 11079a3f20bS\"J. Bruce Fields\ static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); 1119eb2ddb4STrond Myklebust static void gss_put_auth(struct gss_auth *gss_auth); 112cf81939dS\"J. Bruce Fields\ 1135d28dc82STrond Myklebust static void gss_free_ctx(struct gss_cl_ctx *); 114b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0; 115b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1; 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds static inline struct gss_cl_ctx * 1181da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds atomic_inc(&ctx->count); 1211da177e4SLinus Torvalds return ctx; 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds static inline void 1251da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1261da177e4SLinus Torvalds { 1271da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1285d28dc82STrond Myklebust gss_free_ctx(ctx); 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 1315d28dc82STrond Myklebust /* gss_cred_set_ctx: 1325d28dc82STrond Myklebust * called by gss_upcall_callback and gss_create_upcall in order 1335d28dc82STrond Myklebust * to set the gss context. The actual exchange of an old context 1349beae467SStanislav Kinsbursky * and a new one is protected by the pipe->lock. 1355d28dc82STrond Myklebust */ 1361da177e4SLinus Torvalds static void 1371da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1381da177e4SLinus Torvalds { 1391da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1405d28dc82STrond Myklebust 141cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 142cd019f75STrond Myklebust return; 1437b6962b0STrond Myklebust gss_get_ctx(ctx); 144cf778b00SEric Dumazet rcu_assign_pointer(gss_cred->gc_ctx, ctx); 145fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1464e857c58SPeter Zijlstra smp_mb__before_atomic(); 147fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds static const void * 1511da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1521da177e4SLinus Torvalds { 1531da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1541da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1551da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1561da177e4SLinus Torvalds memcpy(res, p, len); 1571da177e4SLinus Torvalds return q; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds static inline const void * 1611da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1621da177e4SLinus Torvalds { 1631da177e4SLinus Torvalds const void *q; 1641da177e4SLinus Torvalds unsigned int len; 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1671da177e4SLinus Torvalds if (IS_ERR(p)) 1681da177e4SLinus Torvalds return p; 1691da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1701da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1711da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1720f38b873STrond Myklebust dest->data = kmemdup(p, len, GFP_NOFS); 1731da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1741da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1751da177e4SLinus Torvalds dest->len = len; 1761da177e4SLinus Torvalds return q; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds static struct gss_cl_ctx * 1801da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1811da177e4SLinus Torvalds { 1821da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1831da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1841da177e4SLinus Torvalds 1855d28dc82STrond Myklebust rcu_read_lock(); 1861da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1871da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1885d28dc82STrond Myklebust rcu_read_unlock(); 1891da177e4SLinus Torvalds return ctx; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds static struct gss_cl_ctx * 1931da177e4SLinus Torvalds gss_alloc_context(void) 1941da177e4SLinus Torvalds { 1951da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1961da177e4SLinus Torvalds 1970f38b873STrond Myklebust ctx = kzalloc(sizeof(*ctx), GFP_NOFS); 1981da177e4SLinus Torvalds if (ctx != NULL) { 1991da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 2001da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 2011da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 2021da177e4SLinus Torvalds atomic_set(&ctx->count,1); 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds return ctx; 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 2081da177e4SLinus Torvalds static const void * 2091da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 2101da177e4SLinus Torvalds { 2111da177e4SLinus Torvalds const void *q; 2121da177e4SLinus Torvalds unsigned int seclen; 2131da177e4SLinus Torvalds unsigned int timeout; 214620038f6SAndy Adamson unsigned long now = jiffies; 2151da177e4SLinus Torvalds u32 window_size; 2161da177e4SLinus Torvalds int ret; 2171da177e4SLinus Torvalds 218620038f6SAndy Adamson /* First unsigned int gives the remaining lifetime in seconds of the 219620038f6SAndy Adamson * credential - e.g. the remaining TGT lifetime for Kerberos or 220620038f6SAndy Adamson * the -t value passed to GSSD. 221620038f6SAndy Adamson */ 2221da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2231da177e4SLinus Torvalds if (IS_ERR(p)) 2241da177e4SLinus Torvalds goto err; 2251da177e4SLinus Torvalds if (timeout == 0) 2261da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 227620038f6SAndy Adamson ctx->gc_expiry = now + ((unsigned long)timeout * HZ); 228620038f6SAndy Adamson /* Sequence number window. Determines the maximum number of 229620038f6SAndy Adamson * simultaneous requests 230620038f6SAndy Adamson */ 2311da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2321da177e4SLinus Torvalds if (IS_ERR(p)) 2331da177e4SLinus Torvalds goto err; 2341da177e4SLinus Torvalds ctx->gc_win = window_size; 2351da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2361da177e4SLinus Torvalds if (ctx->gc_win == 0) { 237dc5ddce9SJeff Layton /* 238dc5ddce9SJeff Layton * in which case, p points to an error code. Anything other 239dc5ddce9SJeff Layton * than -EKEYEXPIRED gets converted to -EACCES. 240dc5ddce9SJeff Layton */ 241dc5ddce9SJeff Layton p = simple_get_bytes(p, end, &ret, sizeof(ret)); 242dc5ddce9SJeff Layton if (!IS_ERR(p)) 243dc5ddce9SJeff Layton p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : 244dc5ddce9SJeff Layton ERR_PTR(-EACCES); 2451da177e4SLinus Torvalds goto err; 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds /* copy the opaque wire context */ 2481da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2491da177e4SLinus Torvalds if (IS_ERR(p)) 2501da177e4SLinus Torvalds goto err; 2511da177e4SLinus Torvalds /* import the opaque security context */ 2521da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2531da177e4SLinus Torvalds if (IS_ERR(p)) 2541da177e4SLinus Torvalds goto err; 2551da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2561da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2571da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2581da177e4SLinus Torvalds goto err; 2591da177e4SLinus Torvalds } 260400f26b5SSimo Sorce ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); 2611da177e4SLinus Torvalds if (ret < 0) { 2621da177e4SLinus Torvalds p = ERR_PTR(ret); 2631da177e4SLinus Torvalds goto err; 2641da177e4SLinus Torvalds } 265620038f6SAndy Adamson dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n", 266620038f6SAndy Adamson __func__, ctx->gc_expiry, now, timeout); 2671da177e4SLinus Torvalds return q; 2681da177e4SLinus Torvalds err: 269173db309SJeff Layton dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); 2701da177e4SLinus Torvalds return p; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 27334769fc4S\"J. Bruce Fields\ #define UPCALL_BUF_LEN 128 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds struct gss_upcall_msg { 2761da177e4SLinus Torvalds atomic_t count; 2777eaf040bSEric W. Biederman kuid_t uid; 2781da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2791da177e4SLinus Torvalds struct list_head list; 2801da177e4SLinus Torvalds struct gss_auth *auth; 2819beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 2821da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2831da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2841da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 28534769fc4S\"J. Bruce Fields\ char databuf[UPCALL_BUF_LEN]; 2861da177e4SLinus Torvalds }; 2871da177e4SLinus Torvalds 2882aed8b47STrond Myklebust static int get_pipe_version(struct net *net) 28979a3f20bS\"J. Bruce Fields\ { 2902aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 29179a3f20bS\"J. Bruce Fields\ int ret; 29279a3f20bS\"J. Bruce Fields\ 29379a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 2942aed8b47STrond Myklebust if (sn->pipe_version >= 0) { 2952aed8b47STrond Myklebust atomic_inc(&sn->pipe_users); 2962aed8b47STrond Myklebust ret = sn->pipe_version; 29779a3f20bS\"J. Bruce Fields\ } else 29879a3f20bS\"J. Bruce Fields\ ret = -EAGAIN; 29979a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 30079a3f20bS\"J. Bruce Fields\ return ret; 30179a3f20bS\"J. Bruce Fields\ } 30279a3f20bS\"J. Bruce Fields\ 3032aed8b47STrond Myklebust static void put_pipe_version(struct net *net) 30479a3f20bS\"J. Bruce Fields\ { 3052aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 3062aed8b47STrond Myklebust 3072aed8b47STrond Myklebust if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { 3082aed8b47STrond Myklebust sn->pipe_version = -1; 30979a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 31079a3f20bS\"J. Bruce Fields\ } 31179a3f20bS\"J. Bruce Fields\ } 31279a3f20bS\"J. Bruce Fields\ 3131da177e4SLinus Torvalds static void 3141da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 3151da177e4SLinus Torvalds { 316e726340aSTrond Myklebust struct net *net = gss_msg->auth->net; 3171da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 3181da177e4SLinus Torvalds return; 3192aed8b47STrond Myklebust put_pipe_version(net); 3201da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 3211da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 3221da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 323f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 3249eb2ddb4STrond Myklebust gss_put_auth(gss_msg->auth); 3251da177e4SLinus Torvalds kfree(gss_msg); 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds static struct gss_upcall_msg * 3297eaf040bSEric W. Biederman __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid) 3301da177e4SLinus Torvalds { 3311da177e4SLinus Torvalds struct gss_upcall_msg *pos; 3329beae467SStanislav Kinsbursky list_for_each_entry(pos, &pipe->in_downcall, list) { 3330b4d51b0SEric W. Biederman if (!uid_eq(pos->uid, uid)) 3341da177e4SLinus Torvalds continue; 3351da177e4SLinus Torvalds atomic_inc(&pos->count); 336632f0d05SChuck Lever dprintk("RPC: %s found msg %p\n", __func__, pos); 3371da177e4SLinus Torvalds return pos; 3381da177e4SLinus Torvalds } 339632f0d05SChuck Lever dprintk("RPC: %s found nothing\n", __func__); 3401da177e4SLinus Torvalds return NULL; 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds 343720b8f2dS\\\"J. Bruce Fields\\\ /* Try to add an upcall to the pipefs queue. 3441da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 3451da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 3461da177e4SLinus Torvalds */ 3471da177e4SLinus Torvalds static inline struct gss_upcall_msg * 348053e324fSSuresh Jayaraman gss_add_msg(struct gss_upcall_msg *gss_msg) 3491da177e4SLinus Torvalds { 3509beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3511da177e4SLinus Torvalds struct gss_upcall_msg *old; 3521da177e4SLinus Torvalds 3539beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3549beae467SStanislav Kinsbursky old = __gss_find_upcall(pipe, gss_msg->uid); 3551da177e4SLinus Torvalds if (old == NULL) { 3561da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3579beae467SStanislav Kinsbursky list_add(&gss_msg->list, &pipe->in_downcall); 3581da177e4SLinus Torvalds } else 3591da177e4SLinus Torvalds gss_msg = old; 3609beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3611da177e4SLinus Torvalds return gss_msg; 3621da177e4SLinus Torvalds } 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds static void 3651da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3661da177e4SLinus Torvalds { 3671da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3681da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3691da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3701da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds static void 3741da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3751da177e4SLinus Torvalds { 3769beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 3771da177e4SLinus Torvalds 3783b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3793b68aaeaSTrond Myklebust return; 3809beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 3813b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3821da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 3839beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds static void 387126e216aSTrond Myklebust gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) 388126e216aSTrond Myklebust { 389126e216aSTrond Myklebust switch (gss_msg->msg.errno) { 390126e216aSTrond Myklebust case 0: 391126e216aSTrond Myklebust if (gss_msg->ctx == NULL) 392126e216aSTrond Myklebust break; 393126e216aSTrond Myklebust clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 394126e216aSTrond Myklebust gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); 395126e216aSTrond Myklebust break; 396126e216aSTrond Myklebust case -EKEYEXPIRED: 397126e216aSTrond Myklebust set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); 398126e216aSTrond Myklebust } 399126e216aSTrond Myklebust gss_cred->gc_upcall_timestamp = jiffies; 400126e216aSTrond Myklebust gss_cred->gc_upcall = NULL; 401126e216aSTrond Myklebust rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 402126e216aSTrond Myklebust } 403126e216aSTrond Myklebust 404126e216aSTrond Myklebust static void 4051da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 4061da177e4SLinus Torvalds { 407a17c2153STrond Myklebust struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, 4081da177e4SLinus Torvalds struct gss_cred, gc_base); 4091da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 4109beae467SStanislav Kinsbursky struct rpc_pipe *pipe = gss_msg->pipe; 4111da177e4SLinus Torvalds 4129beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 413126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 4149beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 415126e216aSTrond Myklebust task->tk_status = gss_msg->msg.errno; 4161da177e4SLinus Torvalds gss_release_msg(gss_msg); 4171da177e4SLinus Torvalds } 4181da177e4SLinus Torvalds 41934769fc4S\"J. Bruce Fields\ static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) 42034769fc4S\"J. Bruce Fields\ { 42190602c7bSEric W. Biederman uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); 42290602c7bSEric W. Biederman memcpy(gss_msg->databuf, &uid, sizeof(uid)); 42390602c7bSEric W. Biederman gss_msg->msg.data = gss_msg->databuf; 42490602c7bSEric W. Biederman gss_msg->msg.len = sizeof(uid); 4259d3a2260STrond Myklebust 4269d3a2260STrond Myklebust BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf)); 42734769fc4S\"J. Bruce Fields\ } 42834769fc4S\"J. Bruce Fields\ 4299d3a2260STrond Myklebust static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, 430bd4a3eb1STrond Myklebust const char *service_name, 431bd4a3eb1STrond Myklebust const char *target_name) 43234769fc4S\"J. Bruce Fields\ { 433683ac665STrond Myklebust struct gss_api_mech *mech = gss_msg->auth->mech; 4348b1c7bf5SOlga Kornievskaia char *p = gss_msg->databuf; 4359d3a2260STrond Myklebust size_t buflen = sizeof(gss_msg->databuf); 4369d3a2260STrond Myklebust int len; 4378b1c7bf5SOlga Kornievskaia 4389d3a2260STrond Myklebust len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name, 43990602c7bSEric W. Biederman from_kuid(&init_user_ns, gss_msg->uid)); 4409d3a2260STrond Myklebust buflen -= len; 4419d3a2260STrond Myklebust p += len; 4429d3a2260STrond Myklebust gss_msg->msg.len = len; 443bd4a3eb1STrond Myklebust if (target_name) { 4449d3a2260STrond Myklebust len = scnprintf(p, buflen, "target=%s ", target_name); 4459d3a2260STrond Myklebust buflen -= len; 4468b1c7bf5SOlga Kornievskaia p += len; 4478b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4488b1c7bf5SOlga Kornievskaia } 44968c97153STrond Myklebust if (service_name != NULL) { 4509d3a2260STrond Myklebust len = scnprintf(p, buflen, "service=%s ", service_name); 4519d3a2260STrond Myklebust buflen -= len; 4522efef708SOlga Kornievskaia p += len; 4532efef708SOlga Kornievskaia gss_msg->msg.len += len; 4542efef708SOlga Kornievskaia } 455683ac665STrond Myklebust if (mech->gm_upcall_enctypes) { 4569d3a2260STrond Myklebust len = scnprintf(p, buflen, "enctypes=%s ", 4579d3a2260STrond Myklebust mech->gm_upcall_enctypes); 4589d3a2260STrond Myklebust buflen -= len; 459683ac665STrond Myklebust p += len; 460683ac665STrond Myklebust gss_msg->msg.len += len; 461683ac665STrond Myklebust } 4629d3a2260STrond Myklebust len = scnprintf(p, buflen, "\n"); 4639d3a2260STrond Myklebust if (len == 0) 4649d3a2260STrond Myklebust goto out_overflow; 4658b1c7bf5SOlga Kornievskaia gss_msg->msg.len += len; 4668b1c7bf5SOlga Kornievskaia 46734769fc4S\"J. Bruce Fields\ gss_msg->msg.data = gss_msg->databuf; 4689d3a2260STrond Myklebust return 0; 4699d3a2260STrond Myklebust out_overflow: 4709d3a2260STrond Myklebust WARN_ON_ONCE(1); 4719d3a2260STrond Myklebust return -ENOMEM; 47234769fc4S\"J. Bruce Fields\ } 47334769fc4S\"J. Bruce Fields\ 47468c97153STrond Myklebust static struct gss_upcall_msg * 475e726340aSTrond Myklebust gss_alloc_msg(struct gss_auth *gss_auth, 4767eaf040bSEric W. Biederman kuid_t uid, const char *service_name) 4771da177e4SLinus Torvalds { 4781da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 47979a3f20bS\"J. Bruce Fields\ int vers; 4809d3a2260STrond Myklebust int err = -ENOMEM; 4811da177e4SLinus Torvalds 4820f38b873STrond Myklebust gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 483db75b3d6S\"J. Bruce Fields\ if (gss_msg == NULL) 4849d3a2260STrond Myklebust goto err; 485e726340aSTrond Myklebust vers = get_pipe_version(gss_auth->net); 4869d3a2260STrond Myklebust err = vers; 4879d3a2260STrond Myklebust if (err < 0) 4889d3a2260STrond Myklebust goto err_free_msg; 48919172284STrond Myklebust gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; 4901da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 4911da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 4921da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 4931da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 4941da177e4SLinus Torvalds gss_msg->uid = uid; 4951da177e4SLinus Torvalds gss_msg->auth = gss_auth; 496bd4a3eb1STrond Myklebust switch (vers) { 497bd4a3eb1STrond Myklebust case 0: 498bd4a3eb1STrond Myklebust gss_encode_v0_msg(gss_msg); 4995fccc5b5STrond Myklebust break; 500bd4a3eb1STrond Myklebust default: 5019d3a2260STrond Myklebust err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name); 5029d3a2260STrond Myklebust if (err) 503e9776d0fSTrond Myklebust goto err_put_pipe_version; 504bd4a3eb1STrond Myklebust }; 5059eb2ddb4STrond Myklebust kref_get(&gss_auth->kref); 5061da177e4SLinus Torvalds return gss_msg; 507e9776d0fSTrond Myklebust err_put_pipe_version: 508e9776d0fSTrond Myklebust put_pipe_version(gss_auth->net); 5099d3a2260STrond Myklebust err_free_msg: 5109d3a2260STrond Myklebust kfree(gss_msg); 5119d3a2260STrond Myklebust err: 5129d3a2260STrond Myklebust return ERR_PTR(err); 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds static struct gss_upcall_msg * 516e726340aSTrond Myklebust gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) 5171da177e4SLinus Torvalds { 5187c67db3aSTrond Myklebust struct gss_cred *gss_cred = container_of(cred, 5197c67db3aSTrond Myklebust struct gss_cred, gc_base); 5201da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 5217eaf040bSEric W. Biederman kuid_t uid = cred->cr_uid; 5221da177e4SLinus Torvalds 523e726340aSTrond Myklebust gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); 524db75b3d6S\"J. Bruce Fields\ if (IS_ERR(gss_new)) 525db75b3d6S\"J. Bruce Fields\ return gss_new; 526053e324fSSuresh Jayaraman gss_msg = gss_add_msg(gss_new); 5271da177e4SLinus Torvalds if (gss_msg == gss_new) { 5289beae467SStanislav Kinsbursky int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); 5291da177e4SLinus Torvalds if (res) { 5301da177e4SLinus Torvalds gss_unhash_msg(gss_new); 5311da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds } else 5341da177e4SLinus Torvalds gss_release_msg(gss_new); 5351da177e4SLinus Torvalds return gss_msg; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds 538b03568c3S\"J. Bruce Fields\ static void warn_gssd(void) 539b03568c3S\"J. Bruce Fields\ { 5400ea9de0eSJeff Layton dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n"); 541b03568c3S\"J. Bruce Fields\ } 542b03568c3S\"J. Bruce Fields\ 5431da177e4SLinus Torvalds static inline int 5441da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 5451da177e4SLinus Torvalds { 546a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 5474a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 5481da177e4SLinus Torvalds struct gss_auth, rpc_auth); 5491da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 5501da177e4SLinus Torvalds struct gss_cred, gc_base); 5511da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5529beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 5531da177e4SLinus Torvalds int err = 0; 5541da177e4SLinus Torvalds 555632f0d05SChuck Lever dprintk("RPC: %5u %s for uid %u\n", 556cdba321eSEric W. Biederman task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); 557e726340aSTrond Myklebust gss_msg = gss_setup_upcall(gss_auth, cred); 558480e3243SRoel Kluin if (PTR_ERR(gss_msg) == -EAGAIN) { 55979a3f20bS\"J. Bruce Fields\ /* XXX: warning on the first, under the assumption we 56079a3f20bS\"J. Bruce Fields\ * shouldn't normally hit this case on a refresh. */ 56179a3f20bS\"J. Bruce Fields\ warn_gssd(); 56279a3f20bS\"J. Bruce Fields\ task->tk_timeout = 15*HZ; 56379a3f20bS\"J. Bruce Fields\ rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); 564d1a8016aSBryan Schumaker return -EAGAIN; 56579a3f20bS\"J. Bruce Fields\ } 5661da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 5671da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 5681da177e4SLinus Torvalds goto out; 5691da177e4SLinus Torvalds } 5709beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 5719beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 5721da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 5735d00837bSTrond Myklebust rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 574126e216aSTrond Myklebust else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 5751da177e4SLinus Torvalds task->tk_timeout = 0; 5761da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 5771da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 5781da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5795d00837bSTrond Myklebust rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 580126e216aSTrond Myklebust } else { 581126e216aSTrond Myklebust gss_handle_downcall_result(gss_cred, gss_msg); 5821da177e4SLinus Torvalds err = gss_msg->msg.errno; 583126e216aSTrond Myklebust } 5849beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 5851da177e4SLinus Torvalds gss_release_msg(gss_msg); 5861da177e4SLinus Torvalds out: 587632f0d05SChuck Lever dprintk("RPC: %5u %s for uid %u result %d\n", 588cdba321eSEric W. Biederman task->tk_pid, __func__, 589cdba321eSEric W. Biederman from_kuid(&init_user_ns, cred->cr_uid), err); 5901da177e4SLinus Torvalds return err; 5911da177e4SLinus Torvalds } 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds static inline int 5941da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 5951da177e4SLinus Torvalds { 596e726340aSTrond Myklebust struct net *net = gss_auth->net; 597abfdbd53STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 5989beae467SStanislav Kinsbursky struct rpc_pipe *pipe; 5991da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 6001da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 6011da177e4SLinus Torvalds DEFINE_WAIT(wait); 602d36ccb9cSTrond Myklebust int err; 6031da177e4SLinus Torvalds 604cdba321eSEric W. Biederman dprintk("RPC: %s for uid %u\n", 605cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, cred->cr_uid)); 60679a3f20bS\"J. Bruce Fields\ retry: 607d36ccb9cSTrond Myklebust err = 0; 60889f84243SJeff Layton /* if gssd is down, just skip upcalling altogether */ 60989f84243SJeff Layton if (!gssd_running(net)) { 61089f84243SJeff Layton warn_gssd(); 61189f84243SJeff Layton return -EACCES; 61289f84243SJeff Layton } 613e726340aSTrond Myklebust gss_msg = gss_setup_upcall(gss_auth, cred); 61479a3f20bS\"J. Bruce Fields\ if (PTR_ERR(gss_msg) == -EAGAIN) { 61579a3f20bS\"J. Bruce Fields\ err = wait_event_interruptible_timeout(pipe_version_waitqueue, 61689f84243SJeff Layton sn->pipe_version >= 0, 15 * HZ); 6172aed8b47STrond Myklebust if (sn->pipe_version < 0) { 618d1a8016aSBryan Schumaker warn_gssd(); 619d1a8016aSBryan Schumaker err = -EACCES; 620d1a8016aSBryan Schumaker } 621d36ccb9cSTrond Myklebust if (err < 0) 62279a3f20bS\"J. Bruce Fields\ goto out; 62379a3f20bS\"J. Bruce Fields\ goto retry; 62479a3f20bS\"J. Bruce Fields\ } 6251da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 6261da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 6271da177e4SLinus Torvalds goto out; 6281da177e4SLinus Torvalds } 6299beae467SStanislav Kinsbursky pipe = gss_msg->pipe; 6301da177e4SLinus Torvalds for (;;) { 6315afa9133STrond Myklebust prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); 6329beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 6331da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 6341da177e4SLinus Torvalds break; 6351da177e4SLinus Torvalds } 6369beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6375afa9133STrond Myklebust if (fatal_signal_pending(current)) { 6381da177e4SLinus Torvalds err = -ERESTARTSYS; 6391da177e4SLinus Torvalds goto out_intr; 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds schedule(); 6421da177e4SLinus Torvalds } 6431da177e4SLinus Torvalds if (gss_msg->ctx) 6447b6962b0STrond Myklebust gss_cred_set_ctx(cred, gss_msg->ctx); 6451da177e4SLinus Torvalds else 6461da177e4SLinus Torvalds err = gss_msg->msg.errno; 6479beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 6481da177e4SLinus Torvalds out_intr: 6491da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 6501da177e4SLinus Torvalds gss_release_msg(gss_msg); 6511da177e4SLinus Torvalds out: 652632f0d05SChuck Lever dprintk("RPC: %s for uid %u result %d\n", 653cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, cred->cr_uid), err); 6541da177e4SLinus Torvalds return err; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds static ssize_t 6601da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 6611da177e4SLinus Torvalds { 6621da177e4SLinus Torvalds const void *p, *end; 6631da177e4SLinus Torvalds void *buf; 6641da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 665496ad9aaSAl Viro struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; 6661da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 66790602c7bSEric W. Biederman uid_t id; 66890602c7bSEric W. Biederman kuid_t uid; 6693b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 6721da177e4SLinus Torvalds goto out; 6731da177e4SLinus Torvalds err = -ENOMEM; 6740f38b873STrond Myklebust buf = kmalloc(mlen, GFP_NOFS); 6751da177e4SLinus Torvalds if (!buf) 6761da177e4SLinus Torvalds goto out; 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds err = -EFAULT; 6791da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 6801da177e4SLinus Torvalds goto err; 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 68390602c7bSEric W. Biederman p = simple_get_bytes(buf, end, &id, sizeof(id)); 6841da177e4SLinus Torvalds if (IS_ERR(p)) { 6851da177e4SLinus Torvalds err = PTR_ERR(p); 6861da177e4SLinus Torvalds goto err; 6871da177e4SLinus Torvalds } 6881da177e4SLinus Torvalds 68990602c7bSEric W. Biederman uid = make_kuid(&init_user_ns, id); 69090602c7bSEric W. Biederman if (!uid_valid(uid)) { 69190602c7bSEric W. Biederman err = -EINVAL; 69290602c7bSEric W. Biederman goto err; 69390602c7bSEric W. Biederman } 69490602c7bSEric W. Biederman 6951da177e4SLinus Torvalds err = -ENOMEM; 6961da177e4SLinus Torvalds ctx = gss_alloc_context(); 6971da177e4SLinus Torvalds if (ctx == NULL) 6981da177e4SLinus Torvalds goto err; 6993b68aaeaSTrond Myklebust 7003b68aaeaSTrond Myklebust err = -ENOENT; 7013b68aaeaSTrond Myklebust /* Find a matching upcall */ 7029beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7039beae467SStanislav Kinsbursky gss_msg = __gss_find_upcall(pipe, uid); 7043b68aaeaSTrond Myklebust if (gss_msg == NULL) { 7059beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7063b68aaeaSTrond Myklebust goto err_put_ctx; 7073b68aaeaSTrond Myklebust } 7083b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 7099beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7103b68aaeaSTrond Myklebust 7116e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 7121da177e4SLinus Torvalds if (IS_ERR(p)) { 7131da177e4SLinus Torvalds err = PTR_ERR(p); 714486bad2eSJeff Layton switch (err) { 715486bad2eSJeff Layton case -EACCES: 716dc5ddce9SJeff Layton case -EKEYEXPIRED: 717486bad2eSJeff Layton gss_msg->msg.errno = err; 718486bad2eSJeff Layton err = mlen; 719486bad2eSJeff Layton break; 720486bad2eSJeff Layton case -EFAULT: 721486bad2eSJeff Layton case -ENOMEM: 722486bad2eSJeff Layton case -EINVAL: 723486bad2eSJeff Layton case -ENOSYS: 724486bad2eSJeff Layton gss_msg->msg.errno = -EAGAIN; 725486bad2eSJeff Layton break; 726486bad2eSJeff Layton default: 727486bad2eSJeff Layton printk(KERN_CRIT "%s: bad return from " 7286c853099SRandy Dunlap "gss_fill_context: %zd\n", __func__, err); 729486bad2eSJeff Layton BUG(); 730486bad2eSJeff Layton } 7313b68aaeaSTrond Myklebust goto err_release_msg; 7321da177e4SLinus Torvalds } 7331da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 7343b68aaeaSTrond Myklebust err = mlen; 7353b68aaeaSTrond Myklebust 7363b68aaeaSTrond Myklebust err_release_msg: 7379beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7381da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 7399beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 7401da177e4SLinus Torvalds gss_release_msg(gss_msg); 7411da177e4SLinus Torvalds err_put_ctx: 7421da177e4SLinus Torvalds gss_put_ctx(ctx); 7431da177e4SLinus Torvalds err: 7441da177e4SLinus Torvalds kfree(buf); 7451da177e4SLinus Torvalds out: 746632f0d05SChuck Lever dprintk("RPC: %s returning %Zd\n", __func__, err); 7471da177e4SLinus Torvalds return err; 7481da177e4SLinus Torvalds } 7491da177e4SLinus Torvalds 75034769fc4S\"J. Bruce Fields\ static int gss_pipe_open(struct inode *inode, int new_version) 751cf81939dS\"J. Bruce Fields\ { 7522aed8b47STrond Myklebust struct net *net = inode->i_sb->s_fs_info; 7532aed8b47STrond Myklebust struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 75434769fc4S\"J. Bruce Fields\ int ret = 0; 75534769fc4S\"J. Bruce Fields\ 75679a3f20bS\"J. Bruce Fields\ spin_lock(&pipe_version_lock); 7572aed8b47STrond Myklebust if (sn->pipe_version < 0) { 75834769fc4S\"J. Bruce Fields\ /* First open of any gss pipe determines the version: */ 7592aed8b47STrond Myklebust sn->pipe_version = new_version; 76079a3f20bS\"J. Bruce Fields\ rpc_wake_up(&pipe_version_rpc_waitqueue); 76179a3f20bS\"J. Bruce Fields\ wake_up(&pipe_version_waitqueue); 7622aed8b47STrond Myklebust } else if (sn->pipe_version != new_version) { 76334769fc4S\"J. Bruce Fields\ /* Trying to open a pipe of a different version */ 76434769fc4S\"J. Bruce Fields\ ret = -EBUSY; 76534769fc4S\"J. Bruce Fields\ goto out; 76679a3f20bS\"J. Bruce Fields\ } 7672aed8b47STrond Myklebust atomic_inc(&sn->pipe_users); 76834769fc4S\"J. Bruce Fields\ out: 76979a3f20bS\"J. Bruce Fields\ spin_unlock(&pipe_version_lock); 77034769fc4S\"J. Bruce Fields\ return ret; 77134769fc4S\"J. Bruce Fields\ 77234769fc4S\"J. Bruce Fields\ } 77334769fc4S\"J. Bruce Fields\ 77434769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v0(struct inode *inode) 77534769fc4S\"J. Bruce Fields\ { 77634769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 0); 77734769fc4S\"J. Bruce Fields\ } 77834769fc4S\"J. Bruce Fields\ 77934769fc4S\"J. Bruce Fields\ static int gss_pipe_open_v1(struct inode *inode) 78034769fc4S\"J. Bruce Fields\ { 78134769fc4S\"J. Bruce Fields\ return gss_pipe_open(inode, 1); 782cf81939dS\"J. Bruce Fields\ } 783cf81939dS\"J. Bruce Fields\ 7841da177e4SLinus Torvalds static void 7851da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 7861da177e4SLinus Torvalds { 7872aed8b47STrond Myklebust struct net *net = inode->i_sb->s_fs_info; 7889beae467SStanislav Kinsbursky struct rpc_pipe *pipe = RPC_I(inode)->pipe; 7891da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 7901da177e4SLinus Torvalds 7915a67657aSTrond Myklebust restart: 7929beae467SStanislav Kinsbursky spin_lock(&pipe->lock); 7939beae467SStanislav Kinsbursky list_for_each_entry(gss_msg, &pipe->in_downcall, list) { 7946e84c7b6STrond Myklebust 7955a67657aSTrond Myklebust if (!list_empty(&gss_msg->msg.list)) 7965a67657aSTrond Myklebust continue; 7971da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 7981da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 7991da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 8009beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 8011da177e4SLinus Torvalds gss_release_msg(gss_msg); 8025a67657aSTrond Myklebust goto restart; 8031da177e4SLinus Torvalds } 8049beae467SStanislav Kinsbursky spin_unlock(&pipe->lock); 805cf81939dS\"J. Bruce Fields\ 8062aed8b47STrond Myklebust put_pipe_version(net); 8071da177e4SLinus Torvalds } 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds static void 8101da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 8111da177e4SLinus Torvalds { 8121da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds if (msg->errno < 0) { 815632f0d05SChuck Lever dprintk("RPC: %s releasing msg %p\n", 816632f0d05SChuck Lever __func__, gss_msg); 8171da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 8181da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 819b03568c3S\"J. Bruce Fields\ if (msg->errno == -ETIMEDOUT) 820b03568c3S\"J. Bruce Fields\ warn_gssd(); 8211da177e4SLinus Torvalds gss_release_msg(gss_msg); 8221da177e4SLinus Torvalds } 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds 82519172284STrond Myklebust static void gss_pipe_dentry_destroy(struct dentry *dir, 82619172284STrond Myklebust struct rpc_pipe_dir_object *pdo) 827ccdc28f8SStanislav Kinsbursky { 82819172284STrond Myklebust struct gss_pipe *gss_pipe = pdo->pdo_data; 82919172284STrond Myklebust struct rpc_pipe *pipe = gss_pipe->pipe; 830ccdc28f8SStanislav Kinsbursky 83119172284STrond Myklebust if (pipe->dentry != NULL) { 83219172284STrond Myklebust rpc_unlink(pipe->dentry); 83319172284STrond Myklebust pipe->dentry = NULL; 8346b2fddd3STrond Myklebust } 835ccdc28f8SStanislav Kinsbursky } 836ccdc28f8SStanislav Kinsbursky 83719172284STrond Myklebust static int gss_pipe_dentry_create(struct dentry *dir, 83819172284STrond Myklebust struct rpc_pipe_dir_object *pdo) 839ccdc28f8SStanislav Kinsbursky { 84019172284STrond Myklebust struct gss_pipe *p = pdo->pdo_data; 8416b2fddd3STrond Myklebust struct dentry *dentry; 842ccdc28f8SStanislav Kinsbursky 84319172284STrond Myklebust dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); 84419172284STrond Myklebust if (IS_ERR(dentry)) 84519172284STrond Myklebust return PTR_ERR(dentry); 84619172284STrond Myklebust p->pipe->dentry = dentry; 847ccdc28f8SStanislav Kinsbursky return 0; 84819172284STrond Myklebust } 849ccdc28f8SStanislav Kinsbursky 85019172284STrond Myklebust static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { 85119172284STrond Myklebust .create = gss_pipe_dentry_create, 85219172284STrond Myklebust .destroy = gss_pipe_dentry_destroy, 85319172284STrond Myklebust }; 85419172284STrond Myklebust 85519172284STrond Myklebust static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, 85619172284STrond Myklebust const char *name, 85719172284STrond Myklebust const struct rpc_pipe_ops *upcall_ops) 85819172284STrond Myklebust { 85919172284STrond Myklebust struct gss_pipe *p; 86019172284STrond Myklebust int err = -ENOMEM; 86119172284STrond Myklebust 86219172284STrond Myklebust p = kmalloc(sizeof(*p), GFP_KERNEL); 86319172284STrond Myklebust if (p == NULL) 86419172284STrond Myklebust goto err; 86519172284STrond Myklebust p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 86619172284STrond Myklebust if (IS_ERR(p->pipe)) { 86719172284STrond Myklebust err = PTR_ERR(p->pipe); 86819172284STrond Myklebust goto err_free_gss_pipe; 86919172284STrond Myklebust } 87019172284STrond Myklebust p->name = name; 87119172284STrond Myklebust p->clnt = clnt; 872414a6295STrond Myklebust kref_init(&p->kref); 87319172284STrond Myklebust rpc_init_pipe_dir_object(&p->pdo, 87419172284STrond Myklebust &gss_pipe_dir_object_ops, 87519172284STrond Myklebust p); 87619172284STrond Myklebust return p; 87719172284STrond Myklebust err_free_gss_pipe: 87819172284STrond Myklebust kfree(p); 8796b2fddd3STrond Myklebust err: 88019172284STrond Myklebust return ERR_PTR(err); 881ccdc28f8SStanislav Kinsbursky } 882ccdc28f8SStanislav Kinsbursky 883414a6295STrond Myklebust struct gss_alloc_pdo { 884414a6295STrond Myklebust struct rpc_clnt *clnt; 885414a6295STrond Myklebust const char *name; 886414a6295STrond Myklebust const struct rpc_pipe_ops *upcall_ops; 887414a6295STrond Myklebust }; 888414a6295STrond Myklebust 889414a6295STrond Myklebust static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) 890414a6295STrond Myklebust { 891414a6295STrond Myklebust struct gss_pipe *gss_pipe; 892414a6295STrond Myklebust struct gss_alloc_pdo *args = data; 893414a6295STrond Myklebust 894414a6295STrond Myklebust if (pdo->pdo_ops != &gss_pipe_dir_object_ops) 895414a6295STrond Myklebust return 0; 896414a6295STrond Myklebust gss_pipe = container_of(pdo, struct gss_pipe, pdo); 897414a6295STrond Myklebust if (strcmp(gss_pipe->name, args->name) != 0) 898414a6295STrond Myklebust return 0; 899414a6295STrond Myklebust if (!kref_get_unless_zero(&gss_pipe->kref)) 900414a6295STrond Myklebust return 0; 901414a6295STrond Myklebust return 1; 902414a6295STrond Myklebust } 903414a6295STrond Myklebust 904414a6295STrond Myklebust static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) 905414a6295STrond Myklebust { 906414a6295STrond Myklebust struct gss_pipe *gss_pipe; 907414a6295STrond Myklebust struct gss_alloc_pdo *args = data; 908414a6295STrond Myklebust 909414a6295STrond Myklebust gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); 910414a6295STrond Myklebust if (!IS_ERR(gss_pipe)) 911414a6295STrond Myklebust return &gss_pipe->pdo; 912414a6295STrond Myklebust return NULL; 913414a6295STrond Myklebust } 914414a6295STrond Myklebust 915414a6295STrond Myklebust static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, 916414a6295STrond Myklebust const char *name, 917414a6295STrond Myklebust const struct rpc_pipe_ops *upcall_ops) 918414a6295STrond Myklebust { 919414a6295STrond Myklebust struct net *net = rpc_net_ns(clnt); 920414a6295STrond Myklebust struct rpc_pipe_dir_object *pdo; 921414a6295STrond Myklebust struct gss_alloc_pdo args = { 922414a6295STrond Myklebust .clnt = clnt, 923414a6295STrond Myklebust .name = name, 924414a6295STrond Myklebust .upcall_ops = upcall_ops, 925414a6295STrond Myklebust }; 926414a6295STrond Myklebust 927414a6295STrond Myklebust pdo = rpc_find_or_alloc_pipe_dir_object(net, 928414a6295STrond Myklebust &clnt->cl_pipedir_objects, 929414a6295STrond Myklebust gss_pipe_match_pdo, 930414a6295STrond Myklebust gss_pipe_alloc_pdo, 931414a6295STrond Myklebust &args); 932414a6295STrond Myklebust if (pdo != NULL) 933414a6295STrond Myklebust return container_of(pdo, struct gss_pipe, pdo); 934414a6295STrond Myklebust return ERR_PTR(-ENOMEM); 935414a6295STrond Myklebust } 936414a6295STrond Myklebust 93719172284STrond Myklebust static void __gss_pipe_free(struct gss_pipe *p) 938ccdc28f8SStanislav Kinsbursky { 93919172284STrond Myklebust struct rpc_clnt *clnt = p->clnt; 94019172284STrond Myklebust struct net *net = rpc_net_ns(clnt); 941ccdc28f8SStanislav Kinsbursky 94219172284STrond Myklebust rpc_remove_pipe_dir_object(net, 94319172284STrond Myklebust &clnt->cl_pipedir_objects, 94419172284STrond Myklebust &p->pdo); 94519172284STrond Myklebust rpc_destroy_pipe_data(p->pipe); 94619172284STrond Myklebust kfree(p); 947ccdc28f8SStanislav Kinsbursky } 948ccdc28f8SStanislav Kinsbursky 949414a6295STrond Myklebust static void __gss_pipe_release(struct kref *kref) 950414a6295STrond Myklebust { 951414a6295STrond Myklebust struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); 952414a6295STrond Myklebust 953414a6295STrond Myklebust __gss_pipe_free(p); 954414a6295STrond Myklebust } 955414a6295STrond Myklebust 95619172284STrond Myklebust static void gss_pipe_free(struct gss_pipe *p) 957ccdc28f8SStanislav Kinsbursky { 95819172284STrond Myklebust if (p != NULL) 959414a6295STrond Myklebust kref_put(&p->kref, __gss_pipe_release); 960ccdc28f8SStanislav Kinsbursky } 961ccdc28f8SStanislav Kinsbursky 9621da177e4SLinus Torvalds /* 9631da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 9641da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 9651da177e4SLinus Torvalds */ 966eb6dc19dSTrond Myklebust static struct gss_auth * 967eb6dc19dSTrond Myklebust gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 9681da177e4SLinus Torvalds { 969c2190661STrond Myklebust rpc_authflavor_t flavor = args->pseudoflavor; 9701da177e4SLinus Torvalds struct gss_auth *gss_auth; 97119172284STrond Myklebust struct gss_pipe *gss_pipe; 9721da177e4SLinus Torvalds struct rpc_auth * auth; 9736a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 9786a19275aSJ. Bruce Fields return ERR_PTR(err); 9791da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 9801da177e4SLinus Torvalds goto out_dec; 981eb6dc19dSTrond Myklebust INIT_HLIST_NODE(&gss_auth->hash); 982bd4a3eb1STrond Myklebust gss_auth->target_name = NULL; 983c2190661STrond Myklebust if (args->target_name) { 984c2190661STrond Myklebust gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); 985bd4a3eb1STrond Myklebust if (gss_auth->target_name == NULL) 986bd4a3eb1STrond Myklebust goto err_free; 987bd4a3eb1STrond Myklebust } 9881da177e4SLinus Torvalds gss_auth->client = clnt; 989e726340aSTrond Myklebust gss_auth->net = get_net(rpc_net_ns(clnt)); 9906a19275aSJ. Bruce Fields err = -EINVAL; 9911da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 9921da177e4SLinus Torvalds if (!gss_auth->mech) { 9939b1d75b7STrond Myklebust dprintk("RPC: Pseudoflavor %d not found!\n", flavor); 994e726340aSTrond Myklebust goto err_put_net; 9951da177e4SLinus Torvalds } 9961da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 997438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 998438b6fdeSJ. Bruce Fields goto err_put_mech; 999a699d65eSTrond Myklebust if (!gssd_running(gss_auth->net)) 1000a699d65eSTrond Myklebust goto err_put_mech; 10011da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 10021da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 10031da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 10041da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 10051da177e4SLinus Torvalds auth->au_flavor = flavor; 10061da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 10070285ed1fSTrond Myklebust kref_init(&gss_auth->kref); 10081da177e4SLinus Torvalds 100919172284STrond Myklebust err = rpcauth_init_credcache(auth); 101019172284STrond Myklebust if (err) 101119172284STrond Myklebust goto err_put_mech; 101234769fc4S\"J. Bruce Fields\ /* 101334769fc4S\"J. Bruce Fields\ * Note: if we created the old pipe first, then someone who 101434769fc4S\"J. Bruce Fields\ * examined the directory at the right moment might conclude 101534769fc4S\"J. Bruce Fields\ * that we supported only the old pipe. So we instead create 101634769fc4S\"J. Bruce Fields\ * the new pipe first. 101734769fc4S\"J. Bruce Fields\ */ 1018414a6295STrond Myklebust gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); 101919172284STrond Myklebust if (IS_ERR(gss_pipe)) { 102019172284STrond Myklebust err = PTR_ERR(gss_pipe); 102119172284STrond Myklebust goto err_destroy_credcache; 10226a19275aSJ. Bruce Fields } 102319172284STrond Myklebust gss_auth->gss_pipe[1] = gss_pipe; 10241da177e4SLinus Torvalds 1025414a6295STrond Myklebust gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, 102619172284STrond Myklebust &gss_upcall_ops_v0); 102719172284STrond Myklebust if (IS_ERR(gss_pipe)) { 102819172284STrond Myklebust err = PTR_ERR(gss_pipe); 1029c239d83bSStanislav Kinsbursky goto err_destroy_pipe_1; 1030c239d83bSStanislav Kinsbursky } 103119172284STrond Myklebust gss_auth->gss_pipe[0] = gss_pipe; 103207a2bf1dSTrond Myklebust 1033eb6dc19dSTrond Myklebust return gss_auth; 1034c239d83bSStanislav Kinsbursky err_destroy_pipe_1: 1035414a6295STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 103619172284STrond Myklebust err_destroy_credcache: 103719172284STrond Myklebust rpcauth_destroy_credcache(auth); 10381da177e4SLinus Torvalds err_put_mech: 10391da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 1040e726340aSTrond Myklebust err_put_net: 1041e726340aSTrond Myklebust put_net(gss_auth->net); 10421da177e4SLinus Torvalds err_free: 1043bd4a3eb1STrond Myklebust kfree(gss_auth->target_name); 10441da177e4SLinus Torvalds kfree(gss_auth); 10451da177e4SLinus Torvalds out_dec: 10461da177e4SLinus Torvalds module_put(THIS_MODULE); 10476a19275aSJ. Bruce Fields return ERR_PTR(err); 10481da177e4SLinus Torvalds } 10491da177e4SLinus Torvalds 10501da177e4SLinus Torvalds static void 10510285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 10520285ed1fSTrond Myklebust { 105319172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[0]); 105419172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 10550285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 1056e726340aSTrond Myklebust put_net(gss_auth->net); 1057bd4a3eb1STrond Myklebust kfree(gss_auth->target_name); 10580285ed1fSTrond Myklebust 10590285ed1fSTrond Myklebust kfree(gss_auth); 10600285ed1fSTrond Myklebust module_put(THIS_MODULE); 10610285ed1fSTrond Myklebust } 10620285ed1fSTrond Myklebust 10630285ed1fSTrond Myklebust static void 10640285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 10650285ed1fSTrond Myklebust { 10660285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 10670285ed1fSTrond Myklebust 10680285ed1fSTrond Myklebust gss_free(gss_auth); 10690285ed1fSTrond Myklebust } 10700285ed1fSTrond Myklebust 10710285ed1fSTrond Myklebust static void 10729eb2ddb4STrond Myklebust gss_put_auth(struct gss_auth *gss_auth) 10739eb2ddb4STrond Myklebust { 10749eb2ddb4STrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 10759eb2ddb4STrond Myklebust } 10769eb2ddb4STrond Myklebust 10779eb2ddb4STrond Myklebust static void 10781da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 10791da177e4SLinus Torvalds { 108019172284STrond Myklebust struct gss_auth *gss_auth = container_of(auth, 108119172284STrond Myklebust struct gss_auth, rpc_auth); 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 10841da177e4SLinus Torvalds auth, auth->au_flavor); 10851da177e4SLinus Torvalds 1086eb6dc19dSTrond Myklebust if (hash_hashed(&gss_auth->hash)) { 1087eb6dc19dSTrond Myklebust spin_lock(&gss_auth_hash_lock); 1088eb6dc19dSTrond Myklebust hash_del(&gss_auth->hash); 1089eb6dc19dSTrond Myklebust spin_unlock(&gss_auth_hash_lock); 1090eb6dc19dSTrond Myklebust } 1091eb6dc19dSTrond Myklebust 109219172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[0]); 109319172284STrond Myklebust gss_auth->gss_pipe[0] = NULL; 109419172284STrond Myklebust gss_pipe_free(gss_auth->gss_pipe[1]); 109519172284STrond Myklebust gss_auth->gss_pipe[1] = NULL; 10963ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 10973ab9bb72STrond Myklebust 10989eb2ddb4STrond Myklebust gss_put_auth(gss_auth); 10991da177e4SLinus Torvalds } 11001da177e4SLinus Torvalds 1101a0f6ed8eSJ. Bruce Fields /* 1102a0f6ed8eSJ. Bruce Fields * Auths may be shared between rpc clients that were cloned from a 1103a0f6ed8eSJ. Bruce Fields * common client with the same xprt, if they also share the flavor and 1104a0f6ed8eSJ. Bruce Fields * target_name. 1105a0f6ed8eSJ. Bruce Fields * 1106a0f6ed8eSJ. Bruce Fields * The auth is looked up from the oldest parent sharing the same 1107a0f6ed8eSJ. Bruce Fields * cl_xprt, and the auth itself references only that common parent 1108a0f6ed8eSJ. Bruce Fields * (which is guaranteed to last as long as any of its descendants). 1109a0f6ed8eSJ. Bruce Fields */ 1110eb6dc19dSTrond Myklebust static struct gss_auth * 1111eb6dc19dSTrond Myklebust gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args, 1112eb6dc19dSTrond Myklebust struct rpc_clnt *clnt, 1113eb6dc19dSTrond Myklebust struct gss_auth *new) 1114eb6dc19dSTrond Myklebust { 1115eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1116eb6dc19dSTrond Myklebust unsigned long hashval = (unsigned long)clnt; 1117eb6dc19dSTrond Myklebust 1118eb6dc19dSTrond Myklebust spin_lock(&gss_auth_hash_lock); 1119eb6dc19dSTrond Myklebust hash_for_each_possible(gss_auth_hash_table, 1120eb6dc19dSTrond Myklebust gss_auth, 1121eb6dc19dSTrond Myklebust hash, 1122eb6dc19dSTrond Myklebust hashval) { 1123a0f6ed8eSJ. Bruce Fields if (gss_auth->client != clnt) 1124a0f6ed8eSJ. Bruce Fields continue; 1125eb6dc19dSTrond Myklebust if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) 1126eb6dc19dSTrond Myklebust continue; 1127eb6dc19dSTrond Myklebust if (gss_auth->target_name != args->target_name) { 1128eb6dc19dSTrond Myklebust if (gss_auth->target_name == NULL) 1129eb6dc19dSTrond Myklebust continue; 1130eb6dc19dSTrond Myklebust if (args->target_name == NULL) 1131eb6dc19dSTrond Myklebust continue; 1132eb6dc19dSTrond Myklebust if (strcmp(gss_auth->target_name, args->target_name)) 1133eb6dc19dSTrond Myklebust continue; 1134eb6dc19dSTrond Myklebust } 1135eb6dc19dSTrond Myklebust if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count)) 1136eb6dc19dSTrond Myklebust continue; 1137eb6dc19dSTrond Myklebust goto out; 1138eb6dc19dSTrond Myklebust } 1139eb6dc19dSTrond Myklebust if (new) 1140eb6dc19dSTrond Myklebust hash_add(gss_auth_hash_table, &new->hash, hashval); 1141eb6dc19dSTrond Myklebust gss_auth = new; 1142eb6dc19dSTrond Myklebust out: 1143eb6dc19dSTrond Myklebust spin_unlock(&gss_auth_hash_lock); 1144eb6dc19dSTrond Myklebust return gss_auth; 1145eb6dc19dSTrond Myklebust } 1146eb6dc19dSTrond Myklebust 1147eb6dc19dSTrond Myklebust static struct gss_auth * 1148eb6dc19dSTrond Myklebust gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 1149eb6dc19dSTrond Myklebust { 1150eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1151eb6dc19dSTrond Myklebust struct gss_auth *new; 1152eb6dc19dSTrond Myklebust 1153eb6dc19dSTrond Myklebust gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); 1154eb6dc19dSTrond Myklebust if (gss_auth != NULL) 1155eb6dc19dSTrond Myklebust goto out; 1156eb6dc19dSTrond Myklebust new = gss_create_new(args, clnt); 1157eb6dc19dSTrond Myklebust if (IS_ERR(new)) 1158eb6dc19dSTrond Myklebust return new; 1159eb6dc19dSTrond Myklebust gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); 1160eb6dc19dSTrond Myklebust if (gss_auth != new) 1161eb6dc19dSTrond Myklebust gss_destroy(&new->rpc_auth); 1162eb6dc19dSTrond Myklebust out: 1163eb6dc19dSTrond Myklebust return gss_auth; 1164eb6dc19dSTrond Myklebust } 1165eb6dc19dSTrond Myklebust 1166eb6dc19dSTrond Myklebust static struct rpc_auth * 1167eb6dc19dSTrond Myklebust gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 1168eb6dc19dSTrond Myklebust { 1169eb6dc19dSTrond Myklebust struct gss_auth *gss_auth; 1170eb6dc19dSTrond Myklebust struct rpc_xprt *xprt = rcu_access_pointer(clnt->cl_xprt); 1171eb6dc19dSTrond Myklebust 1172eb6dc19dSTrond Myklebust while (clnt != clnt->cl_parent) { 1173eb6dc19dSTrond Myklebust struct rpc_clnt *parent = clnt->cl_parent; 1174eb6dc19dSTrond Myklebust /* Find the original parent for this transport */ 1175eb6dc19dSTrond Myklebust if (rcu_access_pointer(parent->cl_xprt) != xprt) 1176eb6dc19dSTrond Myklebust break; 1177eb6dc19dSTrond Myklebust clnt = parent; 1178eb6dc19dSTrond Myklebust } 1179eb6dc19dSTrond Myklebust 1180eb6dc19dSTrond Myklebust gss_auth = gss_create_hashed(args, clnt); 1181eb6dc19dSTrond Myklebust if (IS_ERR(gss_auth)) 1182eb6dc19dSTrond Myklebust return ERR_CAST(gss_auth); 1183eb6dc19dSTrond Myklebust return &gss_auth->rpc_auth; 1184eb6dc19dSTrond Myklebust } 1185eb6dc19dSTrond Myklebust 11860df7fb74STrond Myklebust /* 11870df7fb74STrond Myklebust * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 11880df7fb74STrond Myklebust * to the server with the GSS control procedure field set to 11890df7fb74STrond Myklebust * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 11900df7fb74STrond Myklebust * all RPCSEC_GSS state associated with that context. 11910df7fb74STrond Myklebust */ 11920df7fb74STrond Myklebust static int 11930df7fb74STrond Myklebust gss_destroying_context(struct rpc_cred *cred) 11940df7fb74STrond Myklebust { 11950df7fb74STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 11960df7fb74STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 11970df7fb74STrond Myklebust struct rpc_task *task; 11980df7fb74STrond Myklebust 11990df7fb74STrond Myklebust if (gss_cred->gc_ctx == NULL || 12006dcd3926SJeff Layton test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 12010df7fb74STrond Myklebust return 0; 12020df7fb74STrond Myklebust 12030df7fb74STrond Myklebust gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 12040df7fb74STrond Myklebust cred->cr_ops = &gss_nullops; 12050df7fb74STrond Myklebust 12060df7fb74STrond Myklebust /* Take a reference to ensure the cred will be destroyed either 12070df7fb74STrond Myklebust * by the RPC call or by the put_rpccred() below */ 12080df7fb74STrond Myklebust get_rpccred(cred); 12090df7fb74STrond Myklebust 1210080a1f14STrond Myklebust task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 12110df7fb74STrond Myklebust if (!IS_ERR(task)) 12120df7fb74STrond Myklebust rpc_put_task(task); 12130df7fb74STrond Myklebust 12140df7fb74STrond Myklebust put_rpccred(cred); 12150df7fb74STrond Myklebust return 1; 12160df7fb74STrond Myklebust } 12170df7fb74STrond Myklebust 12180df7fb74STrond Myklebust /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 12191da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 12201da177e4SLinus Torvalds * allocated before freeing them. */ 12211da177e4SLinus Torvalds static void 12225d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 12231da177e4SLinus Torvalds { 1224632f0d05SChuck Lever dprintk("RPC: %s\n", __func__); 12251da177e4SLinus Torvalds 12260d8a3746STrond Myklebust gss_delete_sec_context(&ctx->gc_gss_ctx); 12271da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 12281da177e4SLinus Torvalds kfree(ctx); 12291da177e4SLinus Torvalds } 12301da177e4SLinus Torvalds 12311da177e4SLinus Torvalds static void 12325d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 12335d28dc82STrond Myklebust { 12345d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 12355d28dc82STrond Myklebust gss_do_free_ctx(ctx); 12365d28dc82STrond Myklebust } 12375d28dc82STrond Myklebust 12385d28dc82STrond Myklebust static void 12395d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 12405d28dc82STrond Myklebust { 12415d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 12425d28dc82STrond Myklebust } 12435d28dc82STrond Myklebust 12445d28dc82STrond Myklebust static void 124531be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 12461da177e4SLinus Torvalds { 1247632f0d05SChuck Lever dprintk("RPC: %s cred=%p\n", __func__, gss_cred); 124831be5bf1STrond Myklebust kfree(gss_cred); 124931be5bf1STrond Myklebust } 12501da177e4SLinus Torvalds 125131be5bf1STrond Myklebust static void 125231be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 125331be5bf1STrond Myklebust { 125431be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 125531be5bf1STrond Myklebust gss_free_cred(gss_cred); 125631be5bf1STrond Myklebust } 12571da177e4SLinus Torvalds 125831be5bf1STrond Myklebust static void 12596dcd3926SJeff Layton gss_destroy_nullcred(struct rpc_cred *cred) 126031be5bf1STrond Myklebust { 12615d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 12620285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 12635d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 12645d28dc82STrond Myklebust 1265a9b3cd7fSStephen Hemminger RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); 126631be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 12675d28dc82STrond Myklebust if (ctx) 12685d28dc82STrond Myklebust gss_put_ctx(ctx); 12699eb2ddb4STrond Myklebust gss_put_auth(gss_auth); 12701da177e4SLinus Torvalds } 12711da177e4SLinus Torvalds 12726dcd3926SJeff Layton static void 12736dcd3926SJeff Layton gss_destroy_cred(struct rpc_cred *cred) 12746dcd3926SJeff Layton { 12756dcd3926SJeff Layton 12766dcd3926SJeff Layton if (gss_destroying_context(cred)) 12776dcd3926SJeff Layton return; 12786dcd3926SJeff Layton gss_destroy_nullcred(cred); 12796dcd3926SJeff Layton } 12806dcd3926SJeff Layton 12811da177e4SLinus Torvalds /* 12821da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 12831da177e4SLinus Torvalds */ 12841da177e4SLinus Torvalds static struct rpc_cred * 12858a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 12861da177e4SLinus Torvalds { 12878a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 12881da177e4SLinus Torvalds } 12891da177e4SLinus Torvalds 12901da177e4SLinus Torvalds static struct rpc_cred * 12918a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 12921da177e4SLinus Torvalds { 12931da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 12941da177e4SLinus Torvalds struct gss_cred *cred = NULL; 12951da177e4SLinus Torvalds int err = -ENOMEM; 12961da177e4SLinus Torvalds 1297632f0d05SChuck Lever dprintk("RPC: %s for uid %d, flavor %d\n", 1298cdba321eSEric W. Biederman __func__, from_kuid(&init_user_ns, acred->uid), 1299cdba321eSEric W. Biederman auth->au_flavor); 13001da177e4SLinus Torvalds 13010f38b873STrond Myklebust if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 13021da177e4SLinus Torvalds goto out_err; 13031da177e4SLinus Torvalds 13045fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 13051da177e4SLinus Torvalds /* 13061da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 13071da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 13081da177e4SLinus Torvalds */ 1309fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 13101da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 131168c97153STrond Myklebust cred->gc_principal = NULL; 131268c97153STrond Myklebust if (acred->machine_cred) 131368c97153STrond Myklebust cred->gc_principal = acred->principal; 13140285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 13151da177e4SLinus Torvalds return &cred->gc_base; 13161da177e4SLinus Torvalds 13171da177e4SLinus Torvalds out_err: 1318632f0d05SChuck Lever dprintk("RPC: %s failed with error %d\n", __func__, err); 13191da177e4SLinus Torvalds return ERR_PTR(err); 13201da177e4SLinus Torvalds } 13211da177e4SLinus Torvalds 13221da177e4SLinus Torvalds static int 1323fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 1324fba3bad4STrond Myklebust { 1325fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 1326fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 1327fba3bad4STrond Myklebust int err; 1328fba3bad4STrond Myklebust 1329fba3bad4STrond Myklebust do { 1330fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 1331fba3bad4STrond Myklebust } while (err == -EAGAIN); 1332fba3bad4STrond Myklebust return err; 1333fba3bad4STrond Myklebust } 1334fba3bad4STrond Myklebust 13354de6caa2SAndy Adamson /* 13364de6caa2SAndy Adamson * Returns -EACCES if GSS context is NULL or will expire within the 13374de6caa2SAndy Adamson * timeout (miliseconds) 13384de6caa2SAndy Adamson */ 13394de6caa2SAndy Adamson static int 13404de6caa2SAndy Adamson gss_key_timeout(struct rpc_cred *rc) 13414de6caa2SAndy Adamson { 13424de6caa2SAndy Adamson struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 13434de6caa2SAndy Adamson unsigned long now = jiffies; 13444de6caa2SAndy Adamson unsigned long expire; 13454de6caa2SAndy Adamson 13464de6caa2SAndy Adamson if (gss_cred->gc_ctx == NULL) 13474de6caa2SAndy Adamson return -EACCES; 13484de6caa2SAndy Adamson 13494de6caa2SAndy Adamson expire = gss_cred->gc_ctx->gc_expiry - (gss_key_expire_timeo * HZ); 13504de6caa2SAndy Adamson 13514de6caa2SAndy Adamson if (time_after(now, expire)) 13524de6caa2SAndy Adamson return -EACCES; 13534de6caa2SAndy Adamson return 0; 13544de6caa2SAndy Adamson } 13554de6caa2SAndy Adamson 1356fba3bad4STrond Myklebust static int 13578a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 13581da177e4SLinus Torvalds { 13591da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 13604de6caa2SAndy Adamson int ret; 13611da177e4SLinus Torvalds 1362cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 13638a317760STrond Myklebust goto out; 13641da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 1365cd019f75STrond Myklebust if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 1366cd019f75STrond Myklebust return 0; 1367cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 13681da177e4SLinus Torvalds return 0; 13698a317760STrond Myklebust out: 137068c97153STrond Myklebust if (acred->principal != NULL) { 137168c97153STrond Myklebust if (gss_cred->gc_principal == NULL) 137268c97153STrond Myklebust return 0; 13734de6caa2SAndy Adamson ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; 13744de6caa2SAndy Adamson goto check_expire; 137568c97153STrond Myklebust } 137668c97153STrond Myklebust if (gss_cred->gc_principal != NULL) 13777c67db3aSTrond Myklebust return 0; 13784de6caa2SAndy Adamson ret = uid_eq(rc->cr_uid, acred->uid); 13794de6caa2SAndy Adamson 13804de6caa2SAndy Adamson check_expire: 13814de6caa2SAndy Adamson if (ret == 0) 13824de6caa2SAndy Adamson return ret; 13834de6caa2SAndy Adamson 13844de6caa2SAndy Adamson /* Notify acred users of GSS context expiration timeout */ 13854de6caa2SAndy Adamson if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) && 13864de6caa2SAndy Adamson (gss_key_timeout(rc) != 0)) { 13874de6caa2SAndy Adamson /* test will now be done from generic cred */ 13884de6caa2SAndy Adamson test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags); 13894de6caa2SAndy Adamson /* tell NFS layer that key will expire soon */ 13904de6caa2SAndy Adamson set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags); 13914de6caa2SAndy Adamson } 13924de6caa2SAndy Adamson return ret; 13931da177e4SLinus Torvalds } 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds /* 13961da177e4SLinus Torvalds * Marshal credentials. 13971da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 13981da177e4SLinus Torvalds */ 1399d8ed029dSAlexey Dobriyan static __be32 * 1400d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 14011da177e4SLinus Torvalds { 1402a17c2153STrond Myklebust struct rpc_rqst *req = task->tk_rqstp; 1403a17c2153STrond Myklebust struct rpc_cred *cred = req->rq_cred; 14041da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 14051da177e4SLinus Torvalds gc_base); 14061da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1407d8ed029dSAlexey Dobriyan __be32 *cred_len; 14081da177e4SLinus Torvalds u32 maj_stat = 0; 14091da177e4SLinus Torvalds struct xdr_netobj mic; 14101da177e4SLinus Torvalds struct kvec iov; 14111da177e4SLinus Torvalds struct xdr_buf verf_buf; 14121da177e4SLinus Torvalds 1413632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 14141da177e4SLinus Torvalds 14151da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 14161da177e4SLinus Torvalds cred_len = p++; 14171da177e4SLinus Torvalds 14181da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 14191da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 14201da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 14211da177e4SLinus Torvalds 14221da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 14231da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 14241da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 14251da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 14261da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 14271da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 14281da177e4SLinus Torvalds 14291da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 14301da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 1431a4f0835cSTrond Myklebust iov.iov_base = xprt_skip_transport_header(req->rq_xprt, 1432808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 14331da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 14341da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds /* set verifier flavor*/ 14371da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 14381da177e4SLinus Torvalds 14391da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 144000fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 14411da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 1442fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 14431da177e4SLinus Torvalds } else if (maj_stat != 0) { 14441da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 14451da177e4SLinus Torvalds goto out_put_ctx; 14461da177e4SLinus Torvalds } 14471da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 14481da177e4SLinus Torvalds gss_put_ctx(ctx); 14491da177e4SLinus Torvalds return p; 14501da177e4SLinus Torvalds out_put_ctx: 14511da177e4SLinus Torvalds gss_put_ctx(ctx); 14521da177e4SLinus Torvalds return NULL; 14531da177e4SLinus Torvalds } 14541da177e4SLinus Torvalds 1455cd019f75STrond Myklebust static int gss_renew_cred(struct rpc_task *task) 1456cd019f75STrond Myklebust { 1457a17c2153STrond Myklebust struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; 1458cd019f75STrond Myklebust struct gss_cred *gss_cred = container_of(oldcred, 1459cd019f75STrond Myklebust struct gss_cred, 1460cd019f75STrond Myklebust gc_base); 1461cd019f75STrond Myklebust struct rpc_auth *auth = oldcred->cr_auth; 1462cd019f75STrond Myklebust struct auth_cred acred = { 1463cd019f75STrond Myklebust .uid = oldcred->cr_uid, 146468c97153STrond Myklebust .principal = gss_cred->gc_principal, 146568c97153STrond Myklebust .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), 1466cd019f75STrond Myklebust }; 1467cd019f75STrond Myklebust struct rpc_cred *new; 1468cd019f75STrond Myklebust 1469cd019f75STrond Myklebust new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 1470cd019f75STrond Myklebust if (IS_ERR(new)) 1471cd019f75STrond Myklebust return PTR_ERR(new); 1472a17c2153STrond Myklebust task->tk_rqstp->rq_cred = new; 1473cd019f75STrond Myklebust put_rpccred(oldcred); 1474cd019f75STrond Myklebust return 0; 1475cd019f75STrond Myklebust } 1476cd019f75STrond Myklebust 1477126e216aSTrond Myklebust static int gss_cred_is_negative_entry(struct rpc_cred *cred) 1478126e216aSTrond Myklebust { 1479126e216aSTrond Myklebust if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { 1480126e216aSTrond Myklebust unsigned long now = jiffies; 1481126e216aSTrond Myklebust unsigned long begin, expire; 1482126e216aSTrond Myklebust struct gss_cred *gss_cred; 1483126e216aSTrond Myklebust 1484126e216aSTrond Myklebust gss_cred = container_of(cred, struct gss_cred, gc_base); 1485126e216aSTrond Myklebust begin = gss_cred->gc_upcall_timestamp; 1486126e216aSTrond Myklebust expire = begin + gss_expired_cred_retry_delay * HZ; 1487126e216aSTrond Myklebust 1488126e216aSTrond Myklebust if (time_in_range_open(now, begin, expire)) 1489126e216aSTrond Myklebust return 1; 1490126e216aSTrond Myklebust } 1491126e216aSTrond Myklebust return 0; 1492126e216aSTrond Myklebust } 1493126e216aSTrond Myklebust 14941da177e4SLinus Torvalds /* 14951da177e4SLinus Torvalds * Refresh credentials. XXX - finish 14961da177e4SLinus Torvalds */ 14971da177e4SLinus Torvalds static int 14981da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 14991da177e4SLinus Torvalds { 1500a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 1501cd019f75STrond Myklebust int ret = 0; 15021da177e4SLinus Torvalds 1503126e216aSTrond Myklebust if (gss_cred_is_negative_entry(cred)) 1504126e216aSTrond Myklebust return -EKEYEXPIRED; 1505126e216aSTrond Myklebust 1506cd019f75STrond Myklebust if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 1507cd019f75STrond Myklebust !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 1508cd019f75STrond Myklebust ret = gss_renew_cred(task); 1509cd019f75STrond Myklebust if (ret < 0) 1510cd019f75STrond Myklebust goto out; 1511a17c2153STrond Myklebust cred = task->tk_rqstp->rq_cred; 1512cd019f75STrond Myklebust } 1513cd019f75STrond Myklebust 1514cd019f75STrond Myklebust if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 1515cd019f75STrond Myklebust ret = gss_refresh_upcall(task); 1516cd019f75STrond Myklebust out: 1517cd019f75STrond Myklebust return ret; 15181da177e4SLinus Torvalds } 15191da177e4SLinus Torvalds 15200df7fb74STrond Myklebust /* Dummy refresh routine: used only when destroying the context */ 15210df7fb74STrond Myklebust static int 15220df7fb74STrond Myklebust gss_refresh_null(struct rpc_task *task) 15230df7fb74STrond Myklebust { 1524c297c8b9SAndy Adamson return 0; 15250df7fb74STrond Myklebust } 15260df7fb74STrond Myklebust 1527d8ed029dSAlexey Dobriyan static __be32 * 1528d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 15291da177e4SLinus Torvalds { 1530a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 15311da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1532d8ed029dSAlexey Dobriyan __be32 seq; 15331da177e4SLinus Torvalds struct kvec iov; 15341da177e4SLinus Torvalds struct xdr_buf verf_buf; 15351da177e4SLinus Torvalds struct xdr_netobj mic; 15361da177e4SLinus Torvalds u32 flav,len; 15371da177e4SLinus Torvalds u32 maj_stat; 153835fa5f7bSAndy Adamson __be32 *ret = ERR_PTR(-EIO); 15391da177e4SLinus Torvalds 1540632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 15411da177e4SLinus Torvalds 15421da177e4SLinus Torvalds flav = ntohl(*p++); 15431da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 15441da177e4SLinus Torvalds goto out_bad; 15451da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 15461da177e4SLinus Torvalds goto out_bad; 15471da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 15481da177e4SLinus Torvalds iov.iov_base = &seq; 15491da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 15501da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 15511da177e4SLinus Torvalds mic.data = (u8 *)p; 15521da177e4SLinus Torvalds mic.len = len; 15531da177e4SLinus Torvalds 155435fa5f7bSAndy Adamson ret = ERR_PTR(-EACCES); 155500fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 15561da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1557fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 15580df7fb74STrond Myklebust if (maj_stat) { 1559632f0d05SChuck Lever dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", 1560632f0d05SChuck Lever task->tk_pid, __func__, maj_stat); 15611da177e4SLinus Torvalds goto out_bad; 15620df7fb74STrond Myklebust } 156324b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 156424b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 15651be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 15661da177e4SLinus Torvalds gss_put_ctx(ctx); 1567632f0d05SChuck Lever dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", 1568632f0d05SChuck Lever task->tk_pid, __func__); 15691da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 15701da177e4SLinus Torvalds out_bad: 15711da177e4SLinus Torvalds gss_put_ctx(ctx); 157235fa5f7bSAndy Adamson dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, 157335fa5f7bSAndy Adamson PTR_ERR(ret)); 157435fa5f7bSAndy Adamson return ret; 15751da177e4SLinus Torvalds } 15761da177e4SLinus Torvalds 15779f06c719SChuck Lever static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, 15789f06c719SChuck Lever __be32 *p, void *obj) 15799f06c719SChuck Lever { 15809f06c719SChuck Lever struct xdr_stream xdr; 15819f06c719SChuck Lever 15829f06c719SChuck Lever xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); 15839f06c719SChuck Lever encode(rqstp, &xdr, obj); 15849f06c719SChuck Lever } 15859f06c719SChuck Lever 15861da177e4SLinus Torvalds static inline int 15871da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 15889f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 15899f06c719SChuck Lever __be32 *p, void *obj) 15901da177e4SLinus Torvalds { 15911da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 15921da177e4SLinus Torvalds struct xdr_buf integ_buf; 1593d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 15941da177e4SLinus Torvalds struct xdr_netobj mic; 1595d8ed029dSAlexey Dobriyan u32 offset; 1596d8ed029dSAlexey Dobriyan __be32 *q; 15971da177e4SLinus Torvalds struct kvec *iov; 15981da177e4SLinus Torvalds u32 maj_stat = 0; 15991da177e4SLinus Torvalds int status = -EIO; 16001da177e4SLinus Torvalds 16011da177e4SLinus Torvalds integ_len = p++; 16021da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 16031da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 16041da177e4SLinus Torvalds 16059f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 16061da177e4SLinus Torvalds 16071da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 16081da177e4SLinus Torvalds offset, snd_buf->len - offset)) 16091da177e4SLinus Torvalds return status; 16101da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 16111da177e4SLinus Torvalds 16121da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 16131da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 16141da177e4SLinus Torvalds iov = snd_buf->tail; 16151da177e4SLinus Torvalds else 16161da177e4SLinus Torvalds iov = snd_buf->head; 16171da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 16181da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 16191da177e4SLinus Torvalds 162000fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 16211da177e4SLinus Torvalds status = -EIO; /* XXX? */ 16221da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1623fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 16241da177e4SLinus Torvalds else if (maj_stat) 16251da177e4SLinus Torvalds return status; 16261da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 16271da177e4SLinus Torvalds 16281da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 16291da177e4SLinus Torvalds iov->iov_len += offset; 16301da177e4SLinus Torvalds snd_buf->len += offset; 16311da177e4SLinus Torvalds return 0; 16321da177e4SLinus Torvalds } 16331da177e4SLinus Torvalds 16342d2da60cSJ. Bruce Fields static void 16352d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 16362d2da60cSJ. Bruce Fields { 16372d2da60cSJ. Bruce Fields int i; 16382d2da60cSJ. Bruce Fields 16392d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 16402d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 16412d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 16422d2da60cSJ. Bruce Fields } 16432d2da60cSJ. Bruce Fields 16442d2da60cSJ. Bruce Fields static int 16452d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 16462d2da60cSJ. Bruce Fields { 16472d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 16482d2da60cSJ. Bruce Fields int first, last, i; 16492d2da60cSJ. Bruce Fields 16502d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 16512d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 16522d2da60cSJ. Bruce Fields return 0; 16532d2da60cSJ. Bruce Fields } 16542d2da60cSJ. Bruce Fields 16552d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 16562d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 16572d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 16582d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 16592d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 16602d2da60cSJ. Bruce Fields GFP_NOFS); 16612d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 16622d2da60cSJ. Bruce Fields goto out; 16632d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 16642d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 16652d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 16662d2da60cSJ. Bruce Fields goto out_free; 16672d2da60cSJ. Bruce Fields } 16682d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 16692d2da60cSJ. Bruce Fields return 0; 16702d2da60cSJ. Bruce Fields out_free: 1671cdead7cfSTrond Myklebust rqstp->rq_enc_pages_num = i; 1672cdead7cfSTrond Myklebust priv_release_snd_buf(rqstp); 16732d2da60cSJ. Bruce Fields out: 16742d2da60cSJ. Bruce Fields return -EAGAIN; 16752d2da60cSJ. Bruce Fields } 16762d2da60cSJ. Bruce Fields 16772d2da60cSJ. Bruce Fields static inline int 16782d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 16799f06c719SChuck Lever kxdreproc_t encode, struct rpc_rqst *rqstp, 16809f06c719SChuck Lever __be32 *p, void *obj) 16812d2da60cSJ. Bruce Fields { 16822d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 16832d2da60cSJ. Bruce Fields u32 offset; 16842d2da60cSJ. Bruce Fields u32 maj_stat; 16852d2da60cSJ. Bruce Fields int status; 1686d8ed029dSAlexey Dobriyan __be32 *opaque_len; 16872d2da60cSJ. Bruce Fields struct page **inpages; 16882d2da60cSJ. Bruce Fields int first; 16892d2da60cSJ. Bruce Fields int pad; 16902d2da60cSJ. Bruce Fields struct kvec *iov; 16912d2da60cSJ. Bruce Fields char *tmp; 16922d2da60cSJ. Bruce Fields 16932d2da60cSJ. Bruce Fields opaque_len = p++; 16942d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 16952d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 16962d2da60cSJ. Bruce Fields 16979f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 16982d2da60cSJ. Bruce Fields 16992d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 17002d2da60cSJ. Bruce Fields if (status) 17012d2da60cSJ. Bruce Fields return status; 17022d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 17032d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 17042d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 17052d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 17067561042fSKevin Coffman /* 17077561042fSKevin Coffman * Give the tail its own page, in case we need extra space in the 17087561042fSKevin Coffman * head when wrapping: 17097561042fSKevin Coffman * 17107561042fSKevin Coffman * call_allocate() allocates twice the slack space required 17117561042fSKevin Coffman * by the authentication flavor to rq_callsize. 17127561042fSKevin Coffman * For GSS, slack is GSS_CRED_SLACK. 17137561042fSKevin Coffman */ 17142d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 17152d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 17162d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 17172d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 17182d2da60cSJ. Bruce Fields } 171900fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 17207561042fSKevin Coffman /* slack space should prevent this ever happening: */ 17212d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 17222d2da60cSJ. Bruce Fields status = -EIO; 17232d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 17242d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 17252d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1726fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 17272d2da60cSJ. Bruce Fields else if (maj_stat) 17282d2da60cSJ. Bruce Fields return status; 17292d2da60cSJ. Bruce Fields 17302d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 17312d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 17322d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 17332d2da60cSJ. Bruce Fields iov = snd_buf->tail; 17342d2da60cSJ. Bruce Fields else 17352d2da60cSJ. Bruce Fields iov = snd_buf->head; 17362d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 17372d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 17382d2da60cSJ. Bruce Fields memset(p, 0, pad); 17392d2da60cSJ. Bruce Fields iov->iov_len += pad; 17402d2da60cSJ. Bruce Fields snd_buf->len += pad; 17412d2da60cSJ. Bruce Fields 17422d2da60cSJ. Bruce Fields return 0; 17432d2da60cSJ. Bruce Fields } 17442d2da60cSJ. Bruce Fields 17451da177e4SLinus Torvalds static int 17461da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 17479f06c719SChuck Lever kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) 17481da177e4SLinus Torvalds { 1749a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 17501da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 17511da177e4SLinus Torvalds gc_base); 17521da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 17531da177e4SLinus Torvalds int status = -EIO; 17541da177e4SLinus Torvalds 1755632f0d05SChuck Lever dprintk("RPC: %5u %s\n", task->tk_pid, __func__); 17561da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 17571da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 17581da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 17591da177e4SLinus Torvalds */ 17609f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 17619f06c719SChuck Lever status = 0; 17621da177e4SLinus Torvalds goto out; 17631da177e4SLinus Torvalds } 17641da177e4SLinus Torvalds switch (gss_cred->gc_service) { 17651da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 17669f06c719SChuck Lever gss_wrap_req_encode(encode, rqstp, p, obj); 17679f06c719SChuck Lever status = 0; 17681da177e4SLinus Torvalds break; 17691da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 177089f0e4feSJoe Perches status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); 17711da177e4SLinus Torvalds break; 17721da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 177389f0e4feSJoe Perches status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); 17741da177e4SLinus Torvalds break; 17751da177e4SLinus Torvalds } 17761da177e4SLinus Torvalds out: 17771da177e4SLinus Torvalds gss_put_ctx(ctx); 1778632f0d05SChuck Lever dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); 17791da177e4SLinus Torvalds return status; 17801da177e4SLinus Torvalds } 17811da177e4SLinus Torvalds 17821da177e4SLinus Torvalds static inline int 17831da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1784d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 17851da177e4SLinus Torvalds { 17861da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 17871da177e4SLinus Torvalds struct xdr_buf integ_buf; 17881da177e4SLinus Torvalds struct xdr_netobj mic; 17891da177e4SLinus Torvalds u32 data_offset, mic_offset; 17901da177e4SLinus Torvalds u32 integ_len; 17911da177e4SLinus Torvalds u32 maj_stat; 17921da177e4SLinus Torvalds int status = -EIO; 17931da177e4SLinus Torvalds 17941da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 17951da177e4SLinus Torvalds if (integ_len & 3) 17961da177e4SLinus Torvalds return status; 17971da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 17981da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 17991da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 18001da177e4SLinus Torvalds return status; 18011da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 18021da177e4SLinus Torvalds return status; 18031da177e4SLinus Torvalds 18041da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 18051da177e4SLinus Torvalds mic_offset - data_offset)) 18061da177e4SLinus Torvalds return status; 18071da177e4SLinus Torvalds 18081da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 18091da177e4SLinus Torvalds return status; 18101da177e4SLinus Torvalds 181100fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 18121da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1813fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 18141da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 18151da177e4SLinus Torvalds return status; 18161da177e4SLinus Torvalds return 0; 18171da177e4SLinus Torvalds } 18181da177e4SLinus Torvalds 18192d2da60cSJ. Bruce Fields static inline int 18202d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1821d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 18222d2da60cSJ. Bruce Fields { 18232d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 18242d2da60cSJ. Bruce Fields u32 offset; 18252d2da60cSJ. Bruce Fields u32 opaque_len; 18262d2da60cSJ. Bruce Fields u32 maj_stat; 18272d2da60cSJ. Bruce Fields int status = -EIO; 18282d2da60cSJ. Bruce Fields 18292d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 18302d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 18312d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 18322d2da60cSJ. Bruce Fields return status; 18332d2da60cSJ. Bruce Fields /* remove padding: */ 18342d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 18352d2da60cSJ. Bruce Fields 183600fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 18372d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1838fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 18392d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 18402d2da60cSJ. Bruce Fields return status; 18412d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 18422d2da60cSJ. Bruce Fields return status; 18432d2da60cSJ. Bruce Fields 18442d2da60cSJ. Bruce Fields return 0; 18452d2da60cSJ. Bruce Fields } 18462d2da60cSJ. Bruce Fields 1847bf269551SChuck Lever static int 1848bf269551SChuck Lever gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, 1849bf269551SChuck Lever __be32 *p, void *obj) 1850bf269551SChuck Lever { 1851bf269551SChuck Lever struct xdr_stream xdr; 1852bf269551SChuck Lever 1853bf269551SChuck Lever xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); 1854bf269551SChuck Lever return decode(rqstp, &xdr, obj); 1855bf269551SChuck Lever } 18562d2da60cSJ. Bruce Fields 18571da177e4SLinus Torvalds static int 18581da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1859bf269551SChuck Lever kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) 18601da177e4SLinus Torvalds { 1861a17c2153STrond Myklebust struct rpc_cred *cred = task->tk_rqstp->rq_cred; 18621da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 18631da177e4SLinus Torvalds gc_base); 18641da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1865d8ed029dSAlexey Dobriyan __be32 *savedp = p; 18662d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 18672d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 18681da177e4SLinus Torvalds int status = -EIO; 18691da177e4SLinus Torvalds 18701da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 18711da177e4SLinus Torvalds goto out_decode; 18721da177e4SLinus Torvalds switch (gss_cred->gc_service) { 18731da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 18741da177e4SLinus Torvalds break; 18751da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 18761da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 18771da177e4SLinus Torvalds if (status) 18781da177e4SLinus Torvalds goto out; 18791da177e4SLinus Torvalds break; 18801da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 18812d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 18822d2da60cSJ. Bruce Fields if (status) 18832d2da60cSJ. Bruce Fields goto out; 18841da177e4SLinus Torvalds break; 18851da177e4SLinus Torvalds } 188624b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 18871be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 18882d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 18891da177e4SLinus Torvalds out_decode: 1890bf269551SChuck Lever status = gss_unwrap_req_decode(decode, rqstp, p, obj); 18911da177e4SLinus Torvalds out: 18921da177e4SLinus Torvalds gss_put_ctx(ctx); 1893632f0d05SChuck Lever dprintk("RPC: %5u %s returning %d\n", 1894632f0d05SChuck Lever task->tk_pid, __func__, status); 18951da177e4SLinus Torvalds return status; 18961da177e4SLinus Torvalds } 18971da177e4SLinus Torvalds 1898f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 18991da177e4SLinus Torvalds .owner = THIS_MODULE, 19001da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 19011da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 19021da177e4SLinus Torvalds .create = gss_create, 19031da177e4SLinus Torvalds .destroy = gss_destroy, 19041da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 190580df9d20SStanislav Kinsbursky .crcreate = gss_create_cred, 19066a1a1e34SChuck Lever .list_pseudoflavors = gss_mech_list_pseudoflavors, 19079568c5e9SChuck Lever .info2flavor = gss_mech_info2flavor, 1908a77c806fSChuck Lever .flavor2info = gss_mech_flavor2info, 19091da177e4SLinus Torvalds }; 19101da177e4SLinus Torvalds 1911f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 19121da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 19131da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1914fba3bad4STrond Myklebust .cr_init = gss_cred_init, 19155c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 19161da177e4SLinus Torvalds .crmatch = gss_match, 19171da177e4SLinus Torvalds .crmarshal = gss_marshal, 19181da177e4SLinus Torvalds .crrefresh = gss_refresh, 19191da177e4SLinus Torvalds .crvalidate = gss_validate, 19201da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 19211da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 19224de6caa2SAndy Adamson .crkey_timeout = gss_key_timeout, 19231da177e4SLinus Torvalds }; 19241da177e4SLinus Torvalds 19250df7fb74STrond Myklebust static const struct rpc_credops gss_nullops = { 19260df7fb74STrond Myklebust .cr_name = "AUTH_GSS", 19276dcd3926SJeff Layton .crdestroy = gss_destroy_nullcred, 19285c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 19290df7fb74STrond Myklebust .crmatch = gss_match, 19300df7fb74STrond Myklebust .crmarshal = gss_marshal, 19310df7fb74STrond Myklebust .crrefresh = gss_refresh_null, 19320df7fb74STrond Myklebust .crvalidate = gss_validate, 19330df7fb74STrond Myklebust .crwrap_req = gss_wrap_req, 19340df7fb74STrond Myklebust .crunwrap_resp = gss_unwrap_resp, 19350df7fb74STrond Myklebust }; 19360df7fb74STrond Myklebust 1937b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v0 = { 1938c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 19391da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 19401da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 194134769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v0, 194234769fc4S\"J. Bruce Fields\ .release_pipe = gss_pipe_release, 194334769fc4S\"J. Bruce Fields\ }; 194434769fc4S\"J. Bruce Fields\ 1945b693ba4aSTrond Myklebust static const struct rpc_pipe_ops gss_upcall_ops_v1 = { 1946c1225158SPeng Tao .upcall = rpc_pipe_generic_upcall, 194734769fc4S\"J. Bruce Fields\ .downcall = gss_pipe_downcall, 194834769fc4S\"J. Bruce Fields\ .destroy_msg = gss_pipe_destroy_msg, 194934769fc4S\"J. Bruce Fields\ .open_pipe = gss_pipe_open_v1, 19501da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 19511da177e4SLinus Torvalds }; 19521da177e4SLinus Torvalds 1953a1db410dSStanislav Kinsbursky static __net_init int rpcsec_gss_init_net(struct net *net) 1954a1db410dSStanislav Kinsbursky { 1955a1db410dSStanislav Kinsbursky return gss_svc_init_net(net); 1956a1db410dSStanislav Kinsbursky } 1957a1db410dSStanislav Kinsbursky 1958a1db410dSStanislav Kinsbursky static __net_exit void rpcsec_gss_exit_net(struct net *net) 1959a1db410dSStanislav Kinsbursky { 1960a1db410dSStanislav Kinsbursky gss_svc_shutdown_net(net); 1961a1db410dSStanislav Kinsbursky } 1962a1db410dSStanislav Kinsbursky 1963a1db410dSStanislav Kinsbursky static struct pernet_operations rpcsec_gss_net_ops = { 1964a1db410dSStanislav Kinsbursky .init = rpcsec_gss_init_net, 1965a1db410dSStanislav Kinsbursky .exit = rpcsec_gss_exit_net, 1966a1db410dSStanislav Kinsbursky }; 1967a1db410dSStanislav Kinsbursky 19681da177e4SLinus Torvalds /* 19691da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 19701da177e4SLinus Torvalds */ 19711da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 19721da177e4SLinus Torvalds { 19731da177e4SLinus Torvalds int err = 0; 19741da177e4SLinus Torvalds 19751da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 19761da177e4SLinus Torvalds if (err) 19771da177e4SLinus Torvalds goto out; 19781da177e4SLinus Torvalds err = gss_svc_init(); 19791da177e4SLinus Torvalds if (err) 19801da177e4SLinus Torvalds goto out_unregister; 1981a1db410dSStanislav Kinsbursky err = register_pernet_subsys(&rpcsec_gss_net_ops); 1982a1db410dSStanislav Kinsbursky if (err) 1983a1db410dSStanislav Kinsbursky goto out_svc_exit; 198479a3f20bS\"J. Bruce Fields\ rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); 19851da177e4SLinus Torvalds return 0; 1986a1db410dSStanislav Kinsbursky out_svc_exit: 1987a1db410dSStanislav Kinsbursky gss_svc_shutdown(); 19881da177e4SLinus Torvalds out_unregister: 19891da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 19901da177e4SLinus Torvalds out: 19911da177e4SLinus Torvalds return err; 19921da177e4SLinus Torvalds } 19931da177e4SLinus Torvalds 19941da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 19951da177e4SLinus Torvalds { 1996a1db410dSStanislav Kinsbursky unregister_pernet_subsys(&rpcsec_gss_net_ops); 19971da177e4SLinus Torvalds gss_svc_shutdown(); 19981da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 1999bf12691dSJesper Dangaard Brouer rcu_barrier(); /* Wait for completion of call_rcu()'s */ 20001da177e4SLinus Torvalds } 20011da177e4SLinus Torvalds 200271afa85eSChuck Lever MODULE_ALIAS("rpc-auth-6"); 20031da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2004126e216aSTrond Myklebust module_param_named(expired_cred_retry_delay, 2005126e216aSTrond Myklebust gss_expired_cred_retry_delay, 2006126e216aSTrond Myklebust uint, 0644); 2007126e216aSTrond Myklebust MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " 2008126e216aSTrond Myklebust "the RPC engine retries an expired credential"); 2009126e216aSTrond Myklebust 20104de6caa2SAndy Adamson module_param_named(key_expire_timeo, 20114de6caa2SAndy Adamson gss_key_expire_timeo, 20124de6caa2SAndy Adamson uint, 0644); 20134de6caa2SAndy Adamson MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " 20144de6caa2SAndy Adamson "credential keys lifetime where the NFS layer cleans up " 20154de6caa2SAndy Adamson "prior to key expiration"); 20164de6caa2SAndy Adamson 20171da177e4SLinus Torvalds module_init(init_rpcsec_gss) 20181da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 2019