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 * $Id$ 381da177e4SLinus Torvalds */ 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds #include <linux/module.h> 421da177e4SLinus Torvalds #include <linux/init.h> 431da177e4SLinus Torvalds #include <linux/types.h> 441da177e4SLinus Torvalds #include <linux/slab.h> 451da177e4SLinus Torvalds #include <linux/sched.h> 462d2da60cSJ. Bruce Fields #include <linux/pagemap.h> 471da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 481da177e4SLinus Torvalds #include <linux/sunrpc/auth.h> 491da177e4SLinus Torvalds #include <linux/sunrpc/auth_gss.h> 501da177e4SLinus Torvalds #include <linux/sunrpc/svcauth_gss.h> 511da177e4SLinus Torvalds #include <linux/sunrpc/gss_err.h> 521da177e4SLinus Torvalds #include <linux/workqueue.h> 531da177e4SLinus Torvalds #include <linux/sunrpc/rpc_pipe_fs.h> 541da177e4SLinus Torvalds #include <linux/sunrpc/gss_api.h> 551da177e4SLinus Torvalds #include <asm/uaccess.h> 561da177e4SLinus Torvalds 57f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops; 581da177e4SLinus Torvalds 59f1c0a861STrond Myklebust static const struct rpc_credops gss_credops; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #ifdef RPC_DEBUG 621da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_AUTH 631da177e4SLinus Torvalds #endif 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds #define NFS_NGROUPS 16 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds #define GSS_CRED_SLACK 1024 /* XXX: unused */ 681da177e4SLinus Torvalds /* length of a krb5 verifier (48), plus data added before arguments when 691da177e4SLinus Torvalds * using integrity (two 4-byte integers): */ 70adeb8133SOlga Kornievskaia #define GSS_VERF_SLACK 100 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds /* XXX this define must match the gssd define 731da177e4SLinus Torvalds * as it is passed to gssd to signal the use of 741da177e4SLinus Torvalds * machine creds should be part of the shared rpc interface */ 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds #define CA_RUN_AS_MACHINE 0x00000200 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds /* dump the buffer in `emacs-hexl' style */ 791da177e4SLinus Torvalds #define isprint(c) ((c > 0x1f) && (c < 0x7f)) 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds struct gss_auth { 820285ed1fSTrond Myklebust struct kref kref; 831da177e4SLinus Torvalds struct rpc_auth rpc_auth; 841da177e4SLinus Torvalds struct gss_api_mech *mech; 851da177e4SLinus Torvalds enum rpc_gss_svc service; 861da177e4SLinus Torvalds struct rpc_clnt *client; 871da177e4SLinus Torvalds struct dentry *dentry; 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 905d28dc82STrond Myklebust static void gss_free_ctx(struct gss_cl_ctx *); 911da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds static inline struct gss_cl_ctx * 941da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 951da177e4SLinus Torvalds { 961da177e4SLinus Torvalds atomic_inc(&ctx->count); 971da177e4SLinus Torvalds return ctx; 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds static inline void 1011da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1021da177e4SLinus Torvalds { 1031da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1045d28dc82STrond Myklebust gss_free_ctx(ctx); 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 1075d28dc82STrond Myklebust /* gss_cred_set_ctx: 1085d28dc82STrond Myklebust * called by gss_upcall_callback and gss_create_upcall in order 1095d28dc82STrond Myklebust * to set the gss context. The actual exchange of an old context 1105d28dc82STrond Myklebust * and a new one is protected by the inode->i_lock. 1115d28dc82STrond Myklebust */ 1121da177e4SLinus Torvalds static void 1131da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1141da177e4SLinus Torvalds { 1151da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1161da177e4SLinus Torvalds struct gss_cl_ctx *old; 1175d28dc82STrond Myklebust 1181da177e4SLinus Torvalds old = gss_cred->gc_ctx; 1195d28dc82STrond Myklebust rcu_assign_pointer(gss_cred->gc_ctx, ctx); 120fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 121fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1221da177e4SLinus Torvalds if (old) 1231da177e4SLinus Torvalds gss_put_ctx(old); 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds static int 1271da177e4SLinus Torvalds gss_cred_is_uptodate_ctx(struct rpc_cred *cred) 1281da177e4SLinus Torvalds { 1291da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1301da177e4SLinus Torvalds int res = 0; 1311da177e4SLinus Torvalds 1325d28dc82STrond Myklebust rcu_read_lock(); 133fc432dd9STrond Myklebust if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx) 1341da177e4SLinus Torvalds res = 1; 1355d28dc82STrond Myklebust rcu_read_unlock(); 1361da177e4SLinus Torvalds return res; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds static const void * 1401da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1411da177e4SLinus Torvalds { 1421da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1431da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1441da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1451da177e4SLinus Torvalds memcpy(res, p, len); 1461da177e4SLinus Torvalds return q; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds static inline const void * 1501da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1511da177e4SLinus Torvalds { 1521da177e4SLinus Torvalds const void *q; 1531da177e4SLinus Torvalds unsigned int len; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1561da177e4SLinus Torvalds if (IS_ERR(p)) 1571da177e4SLinus Torvalds return p; 1581da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1591da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1601da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 161e69062b4SArnaldo Carvalho de Melo dest->data = kmemdup(p, len, GFP_KERNEL); 1621da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1631da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1641da177e4SLinus Torvalds dest->len = len; 1651da177e4SLinus Torvalds return q; 1661da177e4SLinus Torvalds } 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds static struct gss_cl_ctx * 1691da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1701da177e4SLinus Torvalds { 1711da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1721da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1731da177e4SLinus Torvalds 1745d28dc82STrond Myklebust rcu_read_lock(); 1751da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1761da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1775d28dc82STrond Myklebust rcu_read_unlock(); 1781da177e4SLinus Torvalds return ctx; 1791da177e4SLinus Torvalds } 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds static struct gss_cl_ctx * 1821da177e4SLinus Torvalds gss_alloc_context(void) 1831da177e4SLinus Torvalds { 1841da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1851da177e4SLinus Torvalds 1860da974f4SPanagiotis Issaris ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 1871da177e4SLinus Torvalds if (ctx != NULL) { 1881da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 1891da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 1901da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 1911da177e4SLinus Torvalds atomic_set(&ctx->count,1); 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds return ctx; 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 1971da177e4SLinus Torvalds static const void * 1981da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds const void *q; 2011da177e4SLinus Torvalds unsigned int seclen; 2021da177e4SLinus Torvalds unsigned int timeout; 2031da177e4SLinus Torvalds u32 window_size; 2041da177e4SLinus Torvalds int ret; 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds /* First unsigned int gives the lifetime (in seconds) of the cred */ 2071da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2081da177e4SLinus Torvalds if (IS_ERR(p)) 2091da177e4SLinus Torvalds goto err; 2101da177e4SLinus Torvalds if (timeout == 0) 2111da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 2121da177e4SLinus Torvalds ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 2131da177e4SLinus Torvalds /* Sequence number window. Determines the maximum number of simultaneous requests */ 2141da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2151da177e4SLinus Torvalds if (IS_ERR(p)) 2161da177e4SLinus Torvalds goto err; 2171da177e4SLinus Torvalds ctx->gc_win = window_size; 2181da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2191da177e4SLinus Torvalds if (ctx->gc_win == 0) { 2201da177e4SLinus Torvalds /* in which case, p points to an error code which we ignore */ 2211da177e4SLinus Torvalds p = ERR_PTR(-EACCES); 2221da177e4SLinus Torvalds goto err; 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds /* copy the opaque wire context */ 2251da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2261da177e4SLinus Torvalds if (IS_ERR(p)) 2271da177e4SLinus Torvalds goto err; 2281da177e4SLinus Torvalds /* import the opaque security context */ 2291da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2301da177e4SLinus Torvalds if (IS_ERR(p)) 2311da177e4SLinus Torvalds goto err; 2321da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2331da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2341da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2351da177e4SLinus Torvalds goto err; 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 2381da177e4SLinus Torvalds if (ret < 0) { 2391da177e4SLinus Torvalds p = ERR_PTR(ret); 2401da177e4SLinus Torvalds goto err; 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds return q; 2431da177e4SLinus Torvalds err: 2441da177e4SLinus Torvalds dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 2451da177e4SLinus Torvalds return p; 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds struct gss_upcall_msg { 2501da177e4SLinus Torvalds atomic_t count; 2511da177e4SLinus Torvalds uid_t uid; 2521da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2531da177e4SLinus Torvalds struct list_head list; 2541da177e4SLinus Torvalds struct gss_auth *auth; 2551da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2561da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2571da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 2581da177e4SLinus Torvalds }; 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds static void 2611da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 2621da177e4SLinus Torvalds { 2631da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 2641da177e4SLinus Torvalds return; 2651da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 2661da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 2671da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 2681da177e4SLinus Torvalds kfree(gss_msg); 2691da177e4SLinus Torvalds } 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds static struct gss_upcall_msg * 2726e84c7b6STrond Myklebust __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 2731da177e4SLinus Torvalds { 2741da177e4SLinus Torvalds struct gss_upcall_msg *pos; 2756e84c7b6STrond Myklebust list_for_each_entry(pos, &rpci->in_downcall, list) { 2761da177e4SLinus Torvalds if (pos->uid != uid) 2771da177e4SLinus Torvalds continue; 2781da177e4SLinus Torvalds atomic_inc(&pos->count); 2791da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found msg %p\n", pos); 2801da177e4SLinus Torvalds return pos; 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found nothing\n"); 2831da177e4SLinus Torvalds return NULL; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds /* Try to add a upcall to the pipefs queue. 2871da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 2881da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 2891da177e4SLinus Torvalds */ 2901da177e4SLinus Torvalds static inline struct gss_upcall_msg * 2911da177e4SLinus Torvalds gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) 2921da177e4SLinus Torvalds { 293b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 2946e84c7b6STrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 2951da177e4SLinus Torvalds struct gss_upcall_msg *old; 2961da177e4SLinus Torvalds 297b185f835STrond Myklebust spin_lock(&inode->i_lock); 2986e84c7b6STrond Myklebust old = __gss_find_upcall(rpci, gss_msg->uid); 2991da177e4SLinus Torvalds if (old == NULL) { 3001da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3016e84c7b6STrond Myklebust list_add(&gss_msg->list, &rpci->in_downcall); 3021da177e4SLinus Torvalds } else 3031da177e4SLinus Torvalds gss_msg = old; 304b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3051da177e4SLinus Torvalds return gss_msg; 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds static void 3091da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3101da177e4SLinus Torvalds { 3111da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3121da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3131da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3141da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds static void 3181da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3191da177e4SLinus Torvalds { 3201da177e4SLinus Torvalds struct gss_auth *gss_auth = gss_msg->auth; 321b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 3221da177e4SLinus Torvalds 3233b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3243b68aaeaSTrond Myklebust return; 325b185f835STrond Myklebust spin_lock(&inode->i_lock); 3263b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3271da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 328b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds static void 3321da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 3331da177e4SLinus Torvalds { 3341da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 3351da177e4SLinus Torvalds struct gss_cred, gc_base); 3361da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 337b185f835STrond Myklebust struct inode *inode = gss_msg->auth->dentry->d_inode; 3381da177e4SLinus Torvalds 3395d28dc82STrond Myklebust spin_lock(&inode->i_lock); 3401da177e4SLinus Torvalds if (gss_msg->ctx) 3411da177e4SLinus Torvalds gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); 3421da177e4SLinus Torvalds else 3431da177e4SLinus Torvalds task->tk_status = gss_msg->msg.errno; 3441da177e4SLinus Torvalds gss_cred->gc_upcall = NULL; 3451da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 346b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3471da177e4SLinus Torvalds gss_release_msg(gss_msg); 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds static inline struct gss_upcall_msg * 3511da177e4SLinus Torvalds gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) 3521da177e4SLinus Torvalds { 3531da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 3541da177e4SLinus Torvalds 3550da974f4SPanagiotis Issaris gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); 3561da177e4SLinus Torvalds if (gss_msg != NULL) { 3571da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 3581da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 3591da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 3601da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 3611da177e4SLinus Torvalds gss_msg->msg.data = &gss_msg->uid; 3621da177e4SLinus Torvalds gss_msg->msg.len = sizeof(gss_msg->uid); 3631da177e4SLinus Torvalds gss_msg->uid = uid; 3641da177e4SLinus Torvalds gss_msg->auth = gss_auth; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds return gss_msg; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds static struct gss_upcall_msg * 3701da177e4SLinus Torvalds gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 3711da177e4SLinus Torvalds { 3721da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); 3751da177e4SLinus Torvalds if (gss_new == NULL) 3761da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 3771da177e4SLinus Torvalds gss_msg = gss_add_msg(gss_auth, gss_new); 3781da177e4SLinus Torvalds if (gss_msg == gss_new) { 3791da177e4SLinus Torvalds int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); 3801da177e4SLinus Torvalds if (res) { 3811da177e4SLinus Torvalds gss_unhash_msg(gss_new); 3821da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds } else 3851da177e4SLinus Torvalds gss_release_msg(gss_new); 3861da177e4SLinus Torvalds return gss_msg; 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds static inline int 3901da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 3911da177e4SLinus Torvalds { 3921da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 3934a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 3941da177e4SLinus Torvalds struct gss_auth, rpc_auth); 3951da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 3961da177e4SLinus Torvalds struct gss_cred, gc_base); 3971da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 398b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 3991da177e4SLinus Torvalds int err = 0; 4001da177e4SLinus Torvalds 4018885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 4028885cb36SChuck Lever cred->cr_uid); 4031da177e4SLinus Torvalds gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 4041da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4051da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4061da177e4SLinus Torvalds goto out; 4071da177e4SLinus Torvalds } 408b185f835STrond Myklebust spin_lock(&inode->i_lock); 4091da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 4101da177e4SLinus Torvalds rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); 4111da177e4SLinus Torvalds else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 4121da177e4SLinus Torvalds task->tk_timeout = 0; 4131da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 4141da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 4151da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 4161da177e4SLinus Torvalds rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); 4171da177e4SLinus Torvalds } else 4181da177e4SLinus Torvalds err = gss_msg->msg.errno; 419b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4201da177e4SLinus Torvalds gss_release_msg(gss_msg); 4211da177e4SLinus Torvalds out: 4228885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 4238885cb36SChuck Lever task->tk_pid, cred->cr_uid, err); 4241da177e4SLinus Torvalds return err; 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds static inline int 4281da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 4291da177e4SLinus Torvalds { 430b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 4311da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 4321da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 4331da177e4SLinus Torvalds DEFINE_WAIT(wait); 4341da177e4SLinus Torvalds int err = 0; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 4371da177e4SLinus Torvalds gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 4381da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4391da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4401da177e4SLinus Torvalds goto out; 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds for (;;) { 4431da177e4SLinus Torvalds prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 444b185f835STrond Myklebust spin_lock(&inode->i_lock); 4451da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 4461da177e4SLinus Torvalds break; 4471da177e4SLinus Torvalds } 448b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4491da177e4SLinus Torvalds if (signalled()) { 4501da177e4SLinus Torvalds err = -ERESTARTSYS; 4511da177e4SLinus Torvalds goto out_intr; 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds schedule(); 4541da177e4SLinus Torvalds } 4551da177e4SLinus Torvalds if (gss_msg->ctx) 4561da177e4SLinus Torvalds gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); 4571da177e4SLinus Torvalds else 4581da177e4SLinus Torvalds err = gss_msg->msg.errno; 4595d28dc82STrond Myklebust spin_unlock(&inode->i_lock); 4601da177e4SLinus Torvalds out_intr: 4611da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 4621da177e4SLinus Torvalds gss_release_msg(gss_msg); 4631da177e4SLinus Torvalds out: 4648885cb36SChuck Lever dprintk("RPC: gss_create_upcall for uid %u result %d\n", 4658885cb36SChuck Lever cred->cr_uid, err); 4661da177e4SLinus Torvalds return err; 4671da177e4SLinus Torvalds } 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds static ssize_t 4701da177e4SLinus Torvalds gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 4711da177e4SLinus Torvalds char __user *dst, size_t buflen) 4721da177e4SLinus Torvalds { 4731da177e4SLinus Torvalds char *data = (char *)msg->data + msg->copied; 4741da177e4SLinus Torvalds ssize_t mlen = msg->len; 4751da177e4SLinus Torvalds ssize_t left; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds if (mlen > buflen) 4781da177e4SLinus Torvalds mlen = buflen; 4791da177e4SLinus Torvalds left = copy_to_user(dst, data, mlen); 4801da177e4SLinus Torvalds if (left < 0) { 4811da177e4SLinus Torvalds msg->errno = left; 4821da177e4SLinus Torvalds return left; 4831da177e4SLinus Torvalds } 4841da177e4SLinus Torvalds mlen -= left; 4851da177e4SLinus Torvalds msg->copied += mlen; 4861da177e4SLinus Torvalds msg->errno = 0; 4871da177e4SLinus Torvalds return mlen; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds static ssize_t 4931da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 4941da177e4SLinus Torvalds { 4951da177e4SLinus Torvalds const void *p, *end; 4961da177e4SLinus Torvalds void *buf; 4971da177e4SLinus Torvalds struct rpc_clnt *clnt; 4981da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 499b185f835STrond Myklebust struct inode *inode = filp->f_path.dentry->d_inode; 5001da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 5011da177e4SLinus Torvalds uid_t uid; 5023b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 5051da177e4SLinus Torvalds goto out; 5061da177e4SLinus Torvalds err = -ENOMEM; 5071da177e4SLinus Torvalds buf = kmalloc(mlen, GFP_KERNEL); 5081da177e4SLinus Torvalds if (!buf) 5091da177e4SLinus Torvalds goto out; 5101da177e4SLinus Torvalds 511b185f835STrond Myklebust clnt = RPC_I(inode)->private; 5121da177e4SLinus Torvalds err = -EFAULT; 5131da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 5141da177e4SLinus Torvalds goto err; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 5171da177e4SLinus Torvalds p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 5181da177e4SLinus Torvalds if (IS_ERR(p)) { 5191da177e4SLinus Torvalds err = PTR_ERR(p); 5201da177e4SLinus Torvalds goto err; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds err = -ENOMEM; 5241da177e4SLinus Torvalds ctx = gss_alloc_context(); 5251da177e4SLinus Torvalds if (ctx == NULL) 5261da177e4SLinus Torvalds goto err; 5273b68aaeaSTrond Myklebust 5283b68aaeaSTrond Myklebust err = -ENOENT; 5293b68aaeaSTrond Myklebust /* Find a matching upcall */ 5303b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5316e84c7b6STrond Myklebust gss_msg = __gss_find_upcall(RPC_I(inode), uid); 5323b68aaeaSTrond Myklebust if (gss_msg == NULL) { 5333b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5343b68aaeaSTrond Myklebust goto err_put_ctx; 5353b68aaeaSTrond Myklebust } 5363b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 5373b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5383b68aaeaSTrond Myklebust 5396e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 5401da177e4SLinus Torvalds if (IS_ERR(p)) { 5411da177e4SLinus Torvalds err = PTR_ERR(p); 5423b68aaeaSTrond Myklebust gss_msg->msg.errno = (err == -EACCES) ? -EACCES : -EAGAIN; 5433b68aaeaSTrond Myklebust goto err_release_msg; 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 5463b68aaeaSTrond Myklebust err = mlen; 5473b68aaeaSTrond Myklebust 5483b68aaeaSTrond Myklebust err_release_msg: 5493b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5501da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 551b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5521da177e4SLinus Torvalds gss_release_msg(gss_msg); 5531da177e4SLinus Torvalds err_put_ctx: 5541da177e4SLinus Torvalds gss_put_ctx(ctx); 5551da177e4SLinus Torvalds err: 5561da177e4SLinus Torvalds kfree(buf); 5571da177e4SLinus Torvalds out: 5583b68aaeaSTrond Myklebust dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 5591da177e4SLinus Torvalds return err; 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds static void 5631da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 5641da177e4SLinus Torvalds { 5651da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 5661da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5671da177e4SLinus Torvalds 5686e84c7b6STrond Myklebust spin_lock(&inode->i_lock); 5696e84c7b6STrond Myklebust while (!list_empty(&rpci->in_downcall)) { 5706e84c7b6STrond Myklebust 5716e84c7b6STrond Myklebust gss_msg = list_entry(rpci->in_downcall.next, 5721da177e4SLinus Torvalds struct gss_upcall_msg, list); 5731da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 5741da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5751da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 576b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5771da177e4SLinus Torvalds gss_release_msg(gss_msg); 578b185f835STrond Myklebust spin_lock(&inode->i_lock); 5791da177e4SLinus Torvalds } 580b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds static void 5841da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 5851da177e4SLinus Torvalds { 5861da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 5871da177e4SLinus Torvalds static unsigned long ratelimit; 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds if (msg->errno < 0) { 5901da177e4SLinus Torvalds dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 5911da177e4SLinus Torvalds gss_msg); 5921da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5931da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 59448e49187STrond Myklebust if (msg->errno == -ETIMEDOUT) { 5951da177e4SLinus Torvalds unsigned long now = jiffies; 5961da177e4SLinus Torvalds if (time_after(now, ratelimit)) { 5971da177e4SLinus Torvalds printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 5981da177e4SLinus Torvalds "Please check user daemon is running!\n"); 5991da177e4SLinus Torvalds ratelimit = now + 15*HZ; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds gss_release_msg(gss_msg); 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds /* 6071da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 6081da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 6091da177e4SLinus Torvalds */ 6101da177e4SLinus Torvalds static struct rpc_auth * 6111da177e4SLinus Torvalds gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 6121da177e4SLinus Torvalds { 6131da177e4SLinus Torvalds struct gss_auth *gss_auth; 6141da177e4SLinus Torvalds struct rpc_auth * auth; 6156a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 6206a19275aSJ. Bruce Fields return ERR_PTR(err); 6211da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 6221da177e4SLinus Torvalds goto out_dec; 6231da177e4SLinus Torvalds gss_auth->client = clnt; 6246a19275aSJ. Bruce Fields err = -EINVAL; 6251da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 6261da177e4SLinus Torvalds if (!gss_auth->mech) { 6271da177e4SLinus Torvalds printk(KERN_WARNING "%s: Pseudoflavor %d not found!", 6281da177e4SLinus Torvalds __FUNCTION__, flavor); 6291da177e4SLinus Torvalds goto err_free; 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 632438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 633438b6fdeSJ. Bruce Fields goto err_put_mech; 6341da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 6351da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 6361da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 6371da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 6381da177e4SLinus Torvalds auth->au_flavor = flavor; 6391da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 6400285ed1fSTrond Myklebust kref_init(&gss_auth->kref); 6411da177e4SLinus Torvalds 642158998b6STrond Myklebust gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, 643158998b6STrond Myklebust clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 6446a19275aSJ. Bruce Fields if (IS_ERR(gss_auth->dentry)) { 6456a19275aSJ. Bruce Fields err = PTR_ERR(gss_auth->dentry); 6461da177e4SLinus Torvalds goto err_put_mech; 6476a19275aSJ. Bruce Fields } 6481da177e4SLinus Torvalds 649f5c2187cSTrond Myklebust err = rpcauth_init_credcache(auth); 65007a2bf1dSTrond Myklebust if (err) 65107a2bf1dSTrond Myklebust goto err_unlink_pipe; 65207a2bf1dSTrond Myklebust 6531da177e4SLinus Torvalds return auth; 65407a2bf1dSTrond Myklebust err_unlink_pipe: 65507a2bf1dSTrond Myklebust rpc_unlink(gss_auth->dentry); 6561da177e4SLinus Torvalds err_put_mech: 6571da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 6581da177e4SLinus Torvalds err_free: 6591da177e4SLinus Torvalds kfree(gss_auth); 6601da177e4SLinus Torvalds out_dec: 6611da177e4SLinus Torvalds module_put(THIS_MODULE); 6626a19275aSJ. Bruce Fields return ERR_PTR(err); 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds static void 6660285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 6670285ed1fSTrond Myklebust { 6680285ed1fSTrond Myklebust rpc_unlink(gss_auth->dentry); 6690285ed1fSTrond Myklebust gss_auth->dentry = NULL; 6700285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 6710285ed1fSTrond Myklebust 6720285ed1fSTrond Myklebust kfree(gss_auth); 6730285ed1fSTrond Myklebust module_put(THIS_MODULE); 6740285ed1fSTrond Myklebust } 6750285ed1fSTrond Myklebust 6760285ed1fSTrond Myklebust static void 6770285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 6780285ed1fSTrond Myklebust { 6790285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 6800285ed1fSTrond Myklebust 6810285ed1fSTrond Myklebust gss_free(gss_auth); 6820285ed1fSTrond Myklebust } 6830285ed1fSTrond Myklebust 6840285ed1fSTrond Myklebust static void 6851da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 6861da177e4SLinus Torvalds { 6871da177e4SLinus Torvalds struct gss_auth *gss_auth; 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 6901da177e4SLinus Torvalds auth, auth->au_flavor); 6911da177e4SLinus Torvalds 6923ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 6933ab9bb72STrond Myklebust 6941da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 6950285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 6961da177e4SLinus Torvalds } 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds /* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure 6991da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 7001da177e4SLinus Torvalds * allocated before freeing them. */ 7011da177e4SLinus Torvalds static void 7025d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 7031da177e4SLinus Torvalds { 7045d28dc82STrond Myklebust dprintk("RPC: gss_free_ctx\n"); 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds if (ctx->gc_gss_ctx) 7071da177e4SLinus Torvalds gss_delete_sec_context(&ctx->gc_gss_ctx); 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 7101da177e4SLinus Torvalds kfree(ctx); 7111da177e4SLinus Torvalds } 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds static void 7145d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 7155d28dc82STrond Myklebust { 7165d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 7175d28dc82STrond Myklebust gss_do_free_ctx(ctx); 7185d28dc82STrond Myklebust } 7195d28dc82STrond Myklebust 7205d28dc82STrond Myklebust static void 7215d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 7225d28dc82STrond Myklebust { 7235d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 7245d28dc82STrond Myklebust } 7255d28dc82STrond Myklebust 7265d28dc82STrond Myklebust static void 72731be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 7281da177e4SLinus Torvalds { 72931be5bf1STrond Myklebust dprintk("RPC: gss_free_cred %p\n", gss_cred); 73031be5bf1STrond Myklebust kfree(gss_cred); 73131be5bf1STrond Myklebust } 7321da177e4SLinus Torvalds 73331be5bf1STrond Myklebust static void 73431be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 73531be5bf1STrond Myklebust { 73631be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 73731be5bf1STrond Myklebust gss_free_cred(gss_cred); 73831be5bf1STrond Myklebust } 7391da177e4SLinus Torvalds 74031be5bf1STrond Myklebust static void 74131be5bf1STrond Myklebust gss_destroy_cred(struct rpc_cred *cred) 74231be5bf1STrond Myklebust { 7435d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 7440285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 7455d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 7465d28dc82STrond Myklebust 7475d28dc82STrond Myklebust rcu_assign_pointer(gss_cred->gc_ctx, NULL); 74831be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 7495d28dc82STrond Myklebust if (ctx) 7505d28dc82STrond Myklebust gss_put_ctx(ctx); 7510285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 7521da177e4SLinus Torvalds } 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds /* 7551da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 7561da177e4SLinus Torvalds */ 7571da177e4SLinus Torvalds static struct rpc_cred * 7588a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7591da177e4SLinus Torvalds { 7608a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 7611da177e4SLinus Torvalds } 7621da177e4SLinus Torvalds 7631da177e4SLinus Torvalds static struct rpc_cred * 7648a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7651da177e4SLinus Torvalds { 7661da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 7671da177e4SLinus Torvalds struct gss_cred *cred = NULL; 7681da177e4SLinus Torvalds int err = -ENOMEM; 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 7711da177e4SLinus Torvalds acred->uid, auth->au_flavor); 7721da177e4SLinus Torvalds 7730da974f4SPanagiotis Issaris if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL))) 7741da177e4SLinus Torvalds goto out_err; 7751da177e4SLinus Torvalds 7765fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 7771da177e4SLinus Torvalds /* 7781da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 7791da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 7801da177e4SLinus Torvalds */ 781fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 7821da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 7830285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 7841da177e4SLinus Torvalds return &cred->gc_base; 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds out_err: 7871da177e4SLinus Torvalds dprintk("RPC: gss_create_cred failed with error %d\n", err); 7881da177e4SLinus Torvalds return ERR_PTR(err); 7891da177e4SLinus Torvalds } 7901da177e4SLinus Torvalds 7911da177e4SLinus Torvalds static int 792fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 793fba3bad4STrond Myklebust { 794fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 795fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 796fba3bad4STrond Myklebust int err; 797fba3bad4STrond Myklebust 798fba3bad4STrond Myklebust do { 799fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 800fba3bad4STrond Myklebust } while (err == -EAGAIN); 801fba3bad4STrond Myklebust return err; 802fba3bad4STrond Myklebust } 803fba3bad4STrond Myklebust 804fba3bad4STrond Myklebust static int 8058a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 8061da177e4SLinus Torvalds { 8071da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 8081da177e4SLinus Torvalds 8098a317760STrond Myklebust /* 8108a317760STrond Myklebust * If the searchflags have set RPCAUTH_LOOKUP_NEW, then 8118a317760STrond Myklebust * we don't really care if the credential has expired or not, 8128a317760STrond Myklebust * since the caller should be prepared to reinitialise it. 8138a317760STrond Myklebust */ 814fc432dd9STrond Myklebust if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 8158a317760STrond Myklebust goto out; 8161da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 8171da177e4SLinus Torvalds if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 8181da177e4SLinus Torvalds return 0; 8198a317760STrond Myklebust out: 8201da177e4SLinus Torvalds return (rc->cr_uid == acred->uid); 8211da177e4SLinus Torvalds } 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvalds /* 8241da177e4SLinus Torvalds * Marshal credentials. 8251da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 8261da177e4SLinus Torvalds */ 827d8ed029dSAlexey Dobriyan static __be32 * 828d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 8291da177e4SLinus Torvalds { 8301da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 8311da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 8321da177e4SLinus Torvalds gc_base); 8331da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 834d8ed029dSAlexey Dobriyan __be32 *cred_len; 8351da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8361da177e4SLinus Torvalds u32 maj_stat = 0; 8371da177e4SLinus Torvalds struct xdr_netobj mic; 8381da177e4SLinus Torvalds struct kvec iov; 8391da177e4SLinus Torvalds struct xdr_buf verf_buf; 8401da177e4SLinus Torvalds 8418885cb36SChuck Lever dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8441da177e4SLinus Torvalds cred_len = p++; 8451da177e4SLinus Torvalds 8461da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 8471da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 8481da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 8511da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 8521da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 8531da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 8541da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 8551da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 8581da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 859808012fbSChuck Lever iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 860808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 8611da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 8621da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds /* set verifier flavor*/ 8651da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 86800fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 8691da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 870fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 8711da177e4SLinus Torvalds } else if (maj_stat != 0) { 8721da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 8731da177e4SLinus Torvalds goto out_put_ctx; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 8761da177e4SLinus Torvalds gss_put_ctx(ctx); 8771da177e4SLinus Torvalds return p; 8781da177e4SLinus Torvalds out_put_ctx: 8791da177e4SLinus Torvalds gss_put_ctx(ctx); 8801da177e4SLinus Torvalds return NULL; 8811da177e4SLinus Torvalds } 8821da177e4SLinus Torvalds 8831da177e4SLinus Torvalds /* 8841da177e4SLinus Torvalds * Refresh credentials. XXX - finish 8851da177e4SLinus Torvalds */ 8861da177e4SLinus Torvalds static int 8871da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 8881da177e4SLinus Torvalds { 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) 8911da177e4SLinus Torvalds return gss_refresh_upcall(task); 8921da177e4SLinus Torvalds return 0; 8931da177e4SLinus Torvalds } 8941da177e4SLinus Torvalds 895d8ed029dSAlexey Dobriyan static __be32 * 896d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 8971da177e4SLinus Torvalds { 8981da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 8991da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 900d8ed029dSAlexey Dobriyan __be32 seq; 9011da177e4SLinus Torvalds struct kvec iov; 9021da177e4SLinus Torvalds struct xdr_buf verf_buf; 9031da177e4SLinus Torvalds struct xdr_netobj mic; 9041da177e4SLinus Torvalds u32 flav,len; 9051da177e4SLinus Torvalds u32 maj_stat; 9061da177e4SLinus Torvalds 9078885cb36SChuck Lever dprintk("RPC: %5u gss_validate\n", task->tk_pid); 9081da177e4SLinus Torvalds 9091da177e4SLinus Torvalds flav = ntohl(*p++); 9101da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 9111da177e4SLinus Torvalds goto out_bad; 9121da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 9131da177e4SLinus Torvalds goto out_bad; 9141da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 9151da177e4SLinus Torvalds iov.iov_base = &seq; 9161da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 9171da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 9181da177e4SLinus Torvalds mic.data = (u8 *)p; 9191da177e4SLinus Torvalds mic.len = len; 9201da177e4SLinus Torvalds 92100fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 9221da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 923fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 9241da177e4SLinus Torvalds if (maj_stat) 9251da177e4SLinus Torvalds goto out_bad; 92624b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 92724b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 9281be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 9291da177e4SLinus Torvalds gss_put_ctx(ctx); 9308885cb36SChuck Lever dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 9311da177e4SLinus Torvalds task->tk_pid); 9321da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 9331da177e4SLinus Torvalds out_bad: 9341da177e4SLinus Torvalds gss_put_ctx(ctx); 9358885cb36SChuck Lever dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 9361da177e4SLinus Torvalds return NULL; 9371da177e4SLinus Torvalds } 9381da177e4SLinus Torvalds 9391da177e4SLinus Torvalds static inline int 9401da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 941d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 9421da177e4SLinus Torvalds { 9431da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 9441da177e4SLinus Torvalds struct xdr_buf integ_buf; 945d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 9461da177e4SLinus Torvalds struct xdr_netobj mic; 947d8ed029dSAlexey Dobriyan u32 offset; 948d8ed029dSAlexey Dobriyan __be32 *q; 9491da177e4SLinus Torvalds struct kvec *iov; 9501da177e4SLinus Torvalds u32 maj_stat = 0; 9511da177e4SLinus Torvalds int status = -EIO; 9521da177e4SLinus Torvalds 9531da177e4SLinus Torvalds integ_len = p++; 9541da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 9551da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds status = encode(rqstp, p, obj); 9581da177e4SLinus Torvalds if (status) 9591da177e4SLinus Torvalds return status; 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 9621da177e4SLinus Torvalds offset, snd_buf->len - offset)) 9631da177e4SLinus Torvalds return status; 9641da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 9671da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 9681da177e4SLinus Torvalds iov = snd_buf->tail; 9691da177e4SLinus Torvalds else 9701da177e4SLinus Torvalds iov = snd_buf->head; 9711da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 9721da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 9731da177e4SLinus Torvalds 97400fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 9751da177e4SLinus Torvalds status = -EIO; /* XXX? */ 9761da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 977fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 9781da177e4SLinus Torvalds else if (maj_stat) 9791da177e4SLinus Torvalds return status; 9801da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 9831da177e4SLinus Torvalds iov->iov_len += offset; 9841da177e4SLinus Torvalds snd_buf->len += offset; 9851da177e4SLinus Torvalds return 0; 9861da177e4SLinus Torvalds } 9871da177e4SLinus Torvalds 9882d2da60cSJ. Bruce Fields static void 9892d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 9902d2da60cSJ. Bruce Fields { 9912d2da60cSJ. Bruce Fields int i; 9922d2da60cSJ. Bruce Fields 9932d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 9942d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 9952d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 9962d2da60cSJ. Bruce Fields } 9972d2da60cSJ. Bruce Fields 9982d2da60cSJ. Bruce Fields static int 9992d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 10002d2da60cSJ. Bruce Fields { 10012d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 10022d2da60cSJ. Bruce Fields int first, last, i; 10032d2da60cSJ. Bruce Fields 10042d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 10052d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 10062d2da60cSJ. Bruce Fields return 0; 10072d2da60cSJ. Bruce Fields } 10082d2da60cSJ. Bruce Fields 10092d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 10102d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 10112d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 10122d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 10132d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 10142d2da60cSJ. Bruce Fields GFP_NOFS); 10152d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 10162d2da60cSJ. Bruce Fields goto out; 10172d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 10182d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 10192d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 10202d2da60cSJ. Bruce Fields goto out_free; 10212d2da60cSJ. Bruce Fields } 10222d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 10232d2da60cSJ. Bruce Fields return 0; 10242d2da60cSJ. Bruce Fields out_free: 10252d2da60cSJ. Bruce Fields for (i--; i >= 0; i--) { 10262d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 10272d2da60cSJ. Bruce Fields } 10282d2da60cSJ. Bruce Fields out: 10292d2da60cSJ. Bruce Fields return -EAGAIN; 10302d2da60cSJ. Bruce Fields } 10312d2da60cSJ. Bruce Fields 10322d2da60cSJ. Bruce Fields static inline int 10332d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1034d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 10352d2da60cSJ. Bruce Fields { 10362d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 10372d2da60cSJ. Bruce Fields u32 offset; 10382d2da60cSJ. Bruce Fields u32 maj_stat; 10392d2da60cSJ. Bruce Fields int status; 1040d8ed029dSAlexey Dobriyan __be32 *opaque_len; 10412d2da60cSJ. Bruce Fields struct page **inpages; 10422d2da60cSJ. Bruce Fields int first; 10432d2da60cSJ. Bruce Fields int pad; 10442d2da60cSJ. Bruce Fields struct kvec *iov; 10452d2da60cSJ. Bruce Fields char *tmp; 10462d2da60cSJ. Bruce Fields 10472d2da60cSJ. Bruce Fields opaque_len = p++; 10482d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 10492d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 10502d2da60cSJ. Bruce Fields 10512d2da60cSJ. Bruce Fields status = encode(rqstp, p, obj); 10522d2da60cSJ. Bruce Fields if (status) 10532d2da60cSJ. Bruce Fields return status; 10542d2da60cSJ. Bruce Fields 10552d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 10562d2da60cSJ. Bruce Fields if (status) 10572d2da60cSJ. Bruce Fields return status; 10582d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 10592d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 10602d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 10612d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 10622d2da60cSJ. Bruce Fields /* Give the tail its own page, in case we need extra space in the 10632d2da60cSJ. Bruce Fields * head when wrapping: */ 10642d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 10652d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 10662d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 10672d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 10682d2da60cSJ. Bruce Fields } 106900fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 10702d2da60cSJ. Bruce Fields /* RPC_SLACK_SPACE should prevent this ever happening: */ 10712d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 10722d2da60cSJ. Bruce Fields status = -EIO; 10732d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 10742d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 10752d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1076fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 10772d2da60cSJ. Bruce Fields else if (maj_stat) 10782d2da60cSJ. Bruce Fields return status; 10792d2da60cSJ. Bruce Fields 10802d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 10812d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 10822d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 10832d2da60cSJ. Bruce Fields iov = snd_buf->tail; 10842d2da60cSJ. Bruce Fields else 10852d2da60cSJ. Bruce Fields iov = snd_buf->head; 10862d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 10872d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 10882d2da60cSJ. Bruce Fields memset(p, 0, pad); 10892d2da60cSJ. Bruce Fields iov->iov_len += pad; 10902d2da60cSJ. Bruce Fields snd_buf->len += pad; 10912d2da60cSJ. Bruce Fields 10922d2da60cSJ. Bruce Fields return 0; 10932d2da60cSJ. Bruce Fields } 10942d2da60cSJ. Bruce Fields 10951da177e4SLinus Torvalds static int 10961da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 1097d8ed029dSAlexey Dobriyan kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 10981da177e4SLinus Torvalds { 10991da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 11001da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 11011da177e4SLinus Torvalds gc_base); 11021da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 11031da177e4SLinus Torvalds int status = -EIO; 11041da177e4SLinus Torvalds 11058885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 11061da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 11071da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 11081da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 11091da177e4SLinus Torvalds */ 11101da177e4SLinus Torvalds status = encode(rqstp, p, obj); 11111da177e4SLinus Torvalds goto out; 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds switch (gss_cred->gc_service) { 11141da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 11151da177e4SLinus Torvalds status = encode(rqstp, p, obj); 11161da177e4SLinus Torvalds break; 11171da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 11181da177e4SLinus Torvalds status = gss_wrap_req_integ(cred, ctx, encode, 11191da177e4SLinus Torvalds rqstp, p, obj); 11201da177e4SLinus Torvalds break; 11211da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 11222d2da60cSJ. Bruce Fields status = gss_wrap_req_priv(cred, ctx, encode, 11232d2da60cSJ. Bruce Fields rqstp, p, obj); 11241da177e4SLinus Torvalds break; 11251da177e4SLinus Torvalds } 11261da177e4SLinus Torvalds out: 11271da177e4SLinus Torvalds gss_put_ctx(ctx); 11288885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 11291da177e4SLinus Torvalds return status; 11301da177e4SLinus Torvalds } 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds static inline int 11331da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1134d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 11351da177e4SLinus Torvalds { 11361da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 11371da177e4SLinus Torvalds struct xdr_buf integ_buf; 11381da177e4SLinus Torvalds struct xdr_netobj mic; 11391da177e4SLinus Torvalds u32 data_offset, mic_offset; 11401da177e4SLinus Torvalds u32 integ_len; 11411da177e4SLinus Torvalds u32 maj_stat; 11421da177e4SLinus Torvalds int status = -EIO; 11431da177e4SLinus Torvalds 11441da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 11451da177e4SLinus Torvalds if (integ_len & 3) 11461da177e4SLinus Torvalds return status; 11471da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 11481da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 11491da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 11501da177e4SLinus Torvalds return status; 11511da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 11521da177e4SLinus Torvalds return status; 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 11551da177e4SLinus Torvalds mic_offset - data_offset)) 11561da177e4SLinus Torvalds return status; 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 11591da177e4SLinus Torvalds return status; 11601da177e4SLinus Torvalds 116100fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 11621da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1163fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11641da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 11651da177e4SLinus Torvalds return status; 11661da177e4SLinus Torvalds return 0; 11671da177e4SLinus Torvalds } 11681da177e4SLinus Torvalds 11692d2da60cSJ. Bruce Fields static inline int 11702d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1171d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 11722d2da60cSJ. Bruce Fields { 11732d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 11742d2da60cSJ. Bruce Fields u32 offset; 11752d2da60cSJ. Bruce Fields u32 opaque_len; 11762d2da60cSJ. Bruce Fields u32 maj_stat; 11772d2da60cSJ. Bruce Fields int status = -EIO; 11782d2da60cSJ. Bruce Fields 11792d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 11802d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 11812d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 11822d2da60cSJ. Bruce Fields return status; 11832d2da60cSJ. Bruce Fields /* remove padding: */ 11842d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 11852d2da60cSJ. Bruce Fields 118600fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 11872d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1188fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11892d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 11902d2da60cSJ. Bruce Fields return status; 11912d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 11922d2da60cSJ. Bruce Fields return status; 11932d2da60cSJ. Bruce Fields 11942d2da60cSJ. Bruce Fields return 0; 11952d2da60cSJ. Bruce Fields } 11962d2da60cSJ. Bruce Fields 11972d2da60cSJ. Bruce Fields 11981da177e4SLinus Torvalds static int 11991da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1200d8ed029dSAlexey Dobriyan kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 12011da177e4SLinus Torvalds { 12021da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 12031da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 12041da177e4SLinus Torvalds gc_base); 12051da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1206d8ed029dSAlexey Dobriyan __be32 *savedp = p; 12072d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 12082d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 12091da177e4SLinus Torvalds int status = -EIO; 12101da177e4SLinus Torvalds 12111da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 12121da177e4SLinus Torvalds goto out_decode; 12131da177e4SLinus Torvalds switch (gss_cred->gc_service) { 12141da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 12151da177e4SLinus Torvalds break; 12161da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 12171da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 12181da177e4SLinus Torvalds if (status) 12191da177e4SLinus Torvalds goto out; 12201da177e4SLinus Torvalds break; 12211da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 12222d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 12232d2da60cSJ. Bruce Fields if (status) 12242d2da60cSJ. Bruce Fields goto out; 12251da177e4SLinus Torvalds break; 12261da177e4SLinus Torvalds } 122724b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 12281be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 12292d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 12301da177e4SLinus Torvalds out_decode: 12311da177e4SLinus Torvalds status = decode(rqstp, p, obj); 12321da177e4SLinus Torvalds out: 12331da177e4SLinus Torvalds gss_put_ctx(ctx); 12348885cb36SChuck Lever dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 12351da177e4SLinus Torvalds status); 12361da177e4SLinus Torvalds return status; 12371da177e4SLinus Torvalds } 12381da177e4SLinus Torvalds 1239f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 12401da177e4SLinus Torvalds .owner = THIS_MODULE, 12411da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 12421da177e4SLinus Torvalds #ifdef RPC_DEBUG 12431da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 12441da177e4SLinus Torvalds #endif 12451da177e4SLinus Torvalds .create = gss_create, 12461da177e4SLinus Torvalds .destroy = gss_destroy, 12471da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 12481da177e4SLinus Torvalds .crcreate = gss_create_cred 12491da177e4SLinus Torvalds }; 12501da177e4SLinus Torvalds 1251f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 12521da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 12531da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1254fba3bad4STrond Myklebust .cr_init = gss_cred_init, 12551da177e4SLinus Torvalds .crmatch = gss_match, 12561da177e4SLinus Torvalds .crmarshal = gss_marshal, 12571da177e4SLinus Torvalds .crrefresh = gss_refresh, 12581da177e4SLinus Torvalds .crvalidate = gss_validate, 12591da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 12601da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 12611da177e4SLinus Torvalds }; 12621da177e4SLinus Torvalds 12631da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops = { 12641da177e4SLinus Torvalds .upcall = gss_pipe_upcall, 12651da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 12661da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 12671da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 12681da177e4SLinus Torvalds }; 12691da177e4SLinus Torvalds 12701da177e4SLinus Torvalds /* 12711da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 12721da177e4SLinus Torvalds */ 12731da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 12741da177e4SLinus Torvalds { 12751da177e4SLinus Torvalds int err = 0; 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 12781da177e4SLinus Torvalds if (err) 12791da177e4SLinus Torvalds goto out; 12801da177e4SLinus Torvalds err = gss_svc_init(); 12811da177e4SLinus Torvalds if (err) 12821da177e4SLinus Torvalds goto out_unregister; 12831da177e4SLinus Torvalds return 0; 12841da177e4SLinus Torvalds out_unregister: 12851da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 12861da177e4SLinus Torvalds out: 12871da177e4SLinus Torvalds return err; 12881da177e4SLinus Torvalds } 12891da177e4SLinus Torvalds 12901da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 12911da177e4SLinus Torvalds { 12921da177e4SLinus Torvalds gss_svc_shutdown(); 12931da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 12941da177e4SLinus Torvalds } 12951da177e4SLinus Torvalds 12961da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 12971da177e4SLinus Torvalds module_init(init_rpcsec_gss) 12981da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1299