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; 600df7fb74STrond Myklebust static const struct rpc_credops gss_nullops; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds #ifdef RPC_DEBUG 631da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_AUTH 641da177e4SLinus Torvalds #endif 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds #define NFS_NGROUPS 16 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds #define GSS_CRED_SLACK 1024 /* XXX: unused */ 691da177e4SLinus Torvalds /* length of a krb5 verifier (48), plus data added before arguments when 701da177e4SLinus Torvalds * using integrity (two 4-byte integers): */ 71adeb8133SOlga Kornievskaia #define GSS_VERF_SLACK 100 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds /* XXX this define must match the gssd define 741da177e4SLinus Torvalds * as it is passed to gssd to signal the use of 751da177e4SLinus Torvalds * machine creds should be part of the shared rpc interface */ 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds #define CA_RUN_AS_MACHINE 0x00000200 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds /* dump the buffer in `emacs-hexl' style */ 801da177e4SLinus Torvalds #define isprint(c) ((c > 0x1f) && (c < 0x7f)) 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds struct gss_auth { 830285ed1fSTrond Myklebust struct kref kref; 841da177e4SLinus Torvalds struct rpc_auth rpc_auth; 851da177e4SLinus Torvalds struct gss_api_mech *mech; 861da177e4SLinus Torvalds enum rpc_gss_svc service; 871da177e4SLinus Torvalds struct rpc_clnt *client; 881da177e4SLinus Torvalds struct dentry *dentry; 891da177e4SLinus Torvalds }; 901da177e4SLinus Torvalds 915d28dc82STrond Myklebust static void gss_free_ctx(struct gss_cl_ctx *); 921da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops; 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds static inline struct gss_cl_ctx * 951da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 961da177e4SLinus Torvalds { 971da177e4SLinus Torvalds atomic_inc(&ctx->count); 981da177e4SLinus Torvalds return ctx; 991da177e4SLinus Torvalds } 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds static inline void 1021da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1031da177e4SLinus Torvalds { 1041da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1055d28dc82STrond Myklebust gss_free_ctx(ctx); 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 1085d28dc82STrond Myklebust /* gss_cred_set_ctx: 1095d28dc82STrond Myklebust * called by gss_upcall_callback and gss_create_upcall in order 1105d28dc82STrond Myklebust * to set the gss context. The actual exchange of an old context 1115d28dc82STrond Myklebust * and a new one is protected by the inode->i_lock. 1125d28dc82STrond Myklebust */ 1131da177e4SLinus Torvalds static void 1141da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1151da177e4SLinus Torvalds { 1161da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1171da177e4SLinus Torvalds struct gss_cl_ctx *old; 1185d28dc82STrond Myklebust 1191da177e4SLinus Torvalds old = gss_cred->gc_ctx; 1205d28dc82STrond Myklebust rcu_assign_pointer(gss_cred->gc_ctx, ctx); 121fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 122fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1231da177e4SLinus Torvalds if (old) 1241da177e4SLinus Torvalds gss_put_ctx(old); 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds static int 1281da177e4SLinus Torvalds gss_cred_is_uptodate_ctx(struct rpc_cred *cred) 1291da177e4SLinus Torvalds { 1301da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1311da177e4SLinus Torvalds int res = 0; 1321da177e4SLinus Torvalds 1335d28dc82STrond Myklebust rcu_read_lock(); 134fc432dd9STrond Myklebust if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx) 1351da177e4SLinus Torvalds res = 1; 1365d28dc82STrond Myklebust rcu_read_unlock(); 1371da177e4SLinus Torvalds return res; 1381da177e4SLinus Torvalds } 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds static const void * 1411da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1421da177e4SLinus Torvalds { 1431da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1441da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1451da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1461da177e4SLinus Torvalds memcpy(res, p, len); 1471da177e4SLinus Torvalds return q; 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds static inline const void * 1511da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1521da177e4SLinus Torvalds { 1531da177e4SLinus Torvalds const void *q; 1541da177e4SLinus Torvalds unsigned int len; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1571da177e4SLinus Torvalds if (IS_ERR(p)) 1581da177e4SLinus Torvalds return p; 1591da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1601da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1611da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 162e69062b4SArnaldo Carvalho de Melo dest->data = kmemdup(p, len, GFP_KERNEL); 1631da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1641da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1651da177e4SLinus Torvalds dest->len = len; 1661da177e4SLinus Torvalds return q; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds static struct gss_cl_ctx * 1701da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1711da177e4SLinus Torvalds { 1721da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1731da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1741da177e4SLinus Torvalds 1755d28dc82STrond Myklebust rcu_read_lock(); 1761da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1771da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1785d28dc82STrond Myklebust rcu_read_unlock(); 1791da177e4SLinus Torvalds return ctx; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds static struct gss_cl_ctx * 1831da177e4SLinus Torvalds gss_alloc_context(void) 1841da177e4SLinus Torvalds { 1851da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1861da177e4SLinus Torvalds 1870da974f4SPanagiotis Issaris ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 1881da177e4SLinus Torvalds if (ctx != NULL) { 1891da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 1901da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 1911da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 1921da177e4SLinus Torvalds atomic_set(&ctx->count,1); 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds return ctx; 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 1981da177e4SLinus Torvalds static const void * 1991da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 2001da177e4SLinus Torvalds { 2011da177e4SLinus Torvalds const void *q; 2021da177e4SLinus Torvalds unsigned int seclen; 2031da177e4SLinus Torvalds unsigned int timeout; 2041da177e4SLinus Torvalds u32 window_size; 2051da177e4SLinus Torvalds int ret; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds /* First unsigned int gives the lifetime (in seconds) of the cred */ 2081da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2091da177e4SLinus Torvalds if (IS_ERR(p)) 2101da177e4SLinus Torvalds goto err; 2111da177e4SLinus Torvalds if (timeout == 0) 2121da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 2131da177e4SLinus Torvalds ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 2141da177e4SLinus Torvalds /* Sequence number window. Determines the maximum number of simultaneous requests */ 2151da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2161da177e4SLinus Torvalds if (IS_ERR(p)) 2171da177e4SLinus Torvalds goto err; 2181da177e4SLinus Torvalds ctx->gc_win = window_size; 2191da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2201da177e4SLinus Torvalds if (ctx->gc_win == 0) { 2211da177e4SLinus Torvalds /* in which case, p points to an error code which we ignore */ 2221da177e4SLinus Torvalds p = ERR_PTR(-EACCES); 2231da177e4SLinus Torvalds goto err; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds /* copy the opaque wire context */ 2261da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2271da177e4SLinus Torvalds if (IS_ERR(p)) 2281da177e4SLinus Torvalds goto err; 2291da177e4SLinus Torvalds /* import the opaque security context */ 2301da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2311da177e4SLinus Torvalds if (IS_ERR(p)) 2321da177e4SLinus Torvalds goto err; 2331da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2341da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2351da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2361da177e4SLinus Torvalds goto err; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 2391da177e4SLinus Torvalds if (ret < 0) { 2401da177e4SLinus Torvalds p = ERR_PTR(ret); 2411da177e4SLinus Torvalds goto err; 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds return q; 2441da177e4SLinus Torvalds err: 2451da177e4SLinus Torvalds dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 2461da177e4SLinus Torvalds return p; 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds struct gss_upcall_msg { 2511da177e4SLinus Torvalds atomic_t count; 2521da177e4SLinus Torvalds uid_t uid; 2531da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2541da177e4SLinus Torvalds struct list_head list; 2551da177e4SLinus Torvalds struct gss_auth *auth; 2561da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2571da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2581da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 2591da177e4SLinus Torvalds }; 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds static void 2621da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 2631da177e4SLinus Torvalds { 2641da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 2651da177e4SLinus Torvalds return; 2661da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 2671da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 2681da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 269f6a1cc89STrond Myklebust rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 2701da177e4SLinus Torvalds kfree(gss_msg); 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds static struct gss_upcall_msg * 2746e84c7b6STrond Myklebust __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 2751da177e4SLinus Torvalds { 2761da177e4SLinus Torvalds struct gss_upcall_msg *pos; 2776e84c7b6STrond Myklebust list_for_each_entry(pos, &rpci->in_downcall, list) { 2781da177e4SLinus Torvalds if (pos->uid != uid) 2791da177e4SLinus Torvalds continue; 2801da177e4SLinus Torvalds atomic_inc(&pos->count); 2811da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found msg %p\n", pos); 2821da177e4SLinus Torvalds return pos; 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found nothing\n"); 2851da177e4SLinus Torvalds return NULL; 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /* Try to add a upcall to the pipefs queue. 2891da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 2901da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 2911da177e4SLinus Torvalds */ 2921da177e4SLinus Torvalds static inline struct gss_upcall_msg * 2931da177e4SLinus Torvalds gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) 2941da177e4SLinus Torvalds { 295b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 2966e84c7b6STrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 2971da177e4SLinus Torvalds struct gss_upcall_msg *old; 2981da177e4SLinus Torvalds 299b185f835STrond Myklebust spin_lock(&inode->i_lock); 3006e84c7b6STrond Myklebust old = __gss_find_upcall(rpci, gss_msg->uid); 3011da177e4SLinus Torvalds if (old == NULL) { 3021da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3036e84c7b6STrond Myklebust list_add(&gss_msg->list, &rpci->in_downcall); 3041da177e4SLinus Torvalds } else 3051da177e4SLinus Torvalds gss_msg = old; 306b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3071da177e4SLinus Torvalds return gss_msg; 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds static void 3111da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3121da177e4SLinus Torvalds { 3131da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3141da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3151da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3161da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds static void 3201da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3211da177e4SLinus Torvalds { 3221da177e4SLinus Torvalds struct gss_auth *gss_auth = gss_msg->auth; 323b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 3241da177e4SLinus Torvalds 3253b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3263b68aaeaSTrond Myklebust return; 327b185f835STrond Myklebust spin_lock(&inode->i_lock); 3283b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3291da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 330b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds static void 3341da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 3351da177e4SLinus Torvalds { 3361da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 3371da177e4SLinus Torvalds struct gss_cred, gc_base); 3381da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 339b185f835STrond Myklebust struct inode *inode = gss_msg->auth->dentry->d_inode; 3401da177e4SLinus Torvalds 3415d28dc82STrond Myklebust spin_lock(&inode->i_lock); 3421da177e4SLinus Torvalds if (gss_msg->ctx) 3431da177e4SLinus Torvalds gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); 3441da177e4SLinus Torvalds else 3451da177e4SLinus Torvalds task->tk_status = gss_msg->msg.errno; 3461da177e4SLinus Torvalds gss_cred->gc_upcall = NULL; 3471da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 348b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3491da177e4SLinus Torvalds gss_release_msg(gss_msg); 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds static inline struct gss_upcall_msg * 3531da177e4SLinus Torvalds gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) 3541da177e4SLinus Torvalds { 3551da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 3561da177e4SLinus Torvalds 3570da974f4SPanagiotis Issaris gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); 3581da177e4SLinus Torvalds if (gss_msg != NULL) { 3591da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 3601da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 3611da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 3621da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 3631da177e4SLinus Torvalds gss_msg->msg.data = &gss_msg->uid; 3641da177e4SLinus Torvalds gss_msg->msg.len = sizeof(gss_msg->uid); 3651da177e4SLinus Torvalds gss_msg->uid = uid; 3661da177e4SLinus Torvalds gss_msg->auth = gss_auth; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds return gss_msg; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds static struct gss_upcall_msg * 3721da177e4SLinus Torvalds gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 3731da177e4SLinus Torvalds { 3747c67db3aSTrond Myklebust struct gss_cred *gss_cred = container_of(cred, 3757c67db3aSTrond Myklebust struct gss_cred, gc_base); 3761da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 3777c67db3aSTrond Myklebust uid_t uid = cred->cr_uid; 3781da177e4SLinus Torvalds 3797c67db3aSTrond Myklebust /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */ 3807c67db3aSTrond Myklebust if (gss_cred->gc_machine_cred != 0) 3817c67db3aSTrond Myklebust uid = 0; 3827c67db3aSTrond Myklebust 3837c67db3aSTrond Myklebust gss_new = gss_alloc_msg(gss_auth, uid); 3841da177e4SLinus Torvalds if (gss_new == NULL) 3851da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 3861da177e4SLinus Torvalds gss_msg = gss_add_msg(gss_auth, gss_new); 3871da177e4SLinus Torvalds if (gss_msg == gss_new) { 3881da177e4SLinus Torvalds int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); 3891da177e4SLinus Torvalds if (res) { 3901da177e4SLinus Torvalds gss_unhash_msg(gss_new); 3911da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds } else 3941da177e4SLinus Torvalds gss_release_msg(gss_new); 3951da177e4SLinus Torvalds return gss_msg; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds static inline int 3991da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 4001da177e4SLinus Torvalds { 4011da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 4024a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 4031da177e4SLinus Torvalds struct gss_auth, rpc_auth); 4041da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 4051da177e4SLinus Torvalds struct gss_cred, gc_base); 4061da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 407b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 4081da177e4SLinus Torvalds int err = 0; 4091da177e4SLinus Torvalds 4108885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 4118885cb36SChuck Lever cred->cr_uid); 4121da177e4SLinus Torvalds gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 4131da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4141da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4151da177e4SLinus Torvalds goto out; 4161da177e4SLinus Torvalds } 417b185f835STrond Myklebust spin_lock(&inode->i_lock); 4181da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 4195d00837bSTrond Myklebust rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 4201da177e4SLinus Torvalds else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 4211da177e4SLinus Torvalds task->tk_timeout = 0; 4221da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 4231da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 4241da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 4255d00837bSTrond Myklebust rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 4261da177e4SLinus Torvalds } else 4271da177e4SLinus Torvalds err = gss_msg->msg.errno; 428b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4291da177e4SLinus Torvalds gss_release_msg(gss_msg); 4301da177e4SLinus Torvalds out: 4318885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 4328885cb36SChuck Lever task->tk_pid, cred->cr_uid, err); 4331da177e4SLinus Torvalds return err; 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds static inline int 4371da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 4381da177e4SLinus Torvalds { 439b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 4401da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 4411da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 4421da177e4SLinus Torvalds DEFINE_WAIT(wait); 4431da177e4SLinus Torvalds int err = 0; 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 4461da177e4SLinus Torvalds gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 4471da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4481da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4491da177e4SLinus Torvalds goto out; 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds for (;;) { 4521da177e4SLinus Torvalds prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 453b185f835STrond Myklebust spin_lock(&inode->i_lock); 4541da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 4551da177e4SLinus Torvalds break; 4561da177e4SLinus Torvalds } 457b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4581da177e4SLinus Torvalds if (signalled()) { 4591da177e4SLinus Torvalds err = -ERESTARTSYS; 4601da177e4SLinus Torvalds goto out_intr; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds schedule(); 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds if (gss_msg->ctx) 4651da177e4SLinus Torvalds gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); 4661da177e4SLinus Torvalds else 4671da177e4SLinus Torvalds err = gss_msg->msg.errno; 4685d28dc82STrond Myklebust spin_unlock(&inode->i_lock); 4691da177e4SLinus Torvalds out_intr: 4701da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 4711da177e4SLinus Torvalds gss_release_msg(gss_msg); 4721da177e4SLinus Torvalds out: 4738885cb36SChuck Lever dprintk("RPC: gss_create_upcall for uid %u result %d\n", 4748885cb36SChuck Lever cred->cr_uid, err); 4751da177e4SLinus Torvalds return err; 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds static ssize_t 4791da177e4SLinus Torvalds gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 4801da177e4SLinus Torvalds char __user *dst, size_t buflen) 4811da177e4SLinus Torvalds { 4821da177e4SLinus Torvalds char *data = (char *)msg->data + msg->copied; 4837df08995SChuck Lever size_t mlen = min(msg->len, buflen); 4847df08995SChuck Lever unsigned long left; 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds left = copy_to_user(dst, data, mlen); 4877df08995SChuck Lever if (left == mlen) { 4887df08995SChuck Lever msg->errno = -EFAULT; 4897df08995SChuck Lever return -EFAULT; 4901da177e4SLinus Torvalds } 4917df08995SChuck Lever 4921da177e4SLinus Torvalds mlen -= left; 4931da177e4SLinus Torvalds msg->copied += mlen; 4941da177e4SLinus Torvalds msg->errno = 0; 4951da177e4SLinus Torvalds return mlen; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds static ssize_t 5011da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 5021da177e4SLinus Torvalds { 5031da177e4SLinus Torvalds const void *p, *end; 5041da177e4SLinus Torvalds void *buf; 5051da177e4SLinus Torvalds struct rpc_clnt *clnt; 5061da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 507b185f835STrond Myklebust struct inode *inode = filp->f_path.dentry->d_inode; 5081da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 5091da177e4SLinus Torvalds uid_t uid; 5103b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 5131da177e4SLinus Torvalds goto out; 5141da177e4SLinus Torvalds err = -ENOMEM; 5151da177e4SLinus Torvalds buf = kmalloc(mlen, GFP_KERNEL); 5161da177e4SLinus Torvalds if (!buf) 5171da177e4SLinus Torvalds goto out; 5181da177e4SLinus Torvalds 519b185f835STrond Myklebust clnt = RPC_I(inode)->private; 5201da177e4SLinus Torvalds err = -EFAULT; 5211da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 5221da177e4SLinus Torvalds goto err; 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 5251da177e4SLinus Torvalds p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 5261da177e4SLinus Torvalds if (IS_ERR(p)) { 5271da177e4SLinus Torvalds err = PTR_ERR(p); 5281da177e4SLinus Torvalds goto err; 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds err = -ENOMEM; 5321da177e4SLinus Torvalds ctx = gss_alloc_context(); 5331da177e4SLinus Torvalds if (ctx == NULL) 5341da177e4SLinus Torvalds goto err; 5353b68aaeaSTrond Myklebust 5363b68aaeaSTrond Myklebust err = -ENOENT; 5373b68aaeaSTrond Myklebust /* Find a matching upcall */ 5383b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5396e84c7b6STrond Myklebust gss_msg = __gss_find_upcall(RPC_I(inode), uid); 5403b68aaeaSTrond Myklebust if (gss_msg == NULL) { 5413b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5423b68aaeaSTrond Myklebust goto err_put_ctx; 5433b68aaeaSTrond Myklebust } 5443b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 5453b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5463b68aaeaSTrond Myklebust 5476e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 5481da177e4SLinus Torvalds if (IS_ERR(p)) { 5491da177e4SLinus Torvalds err = PTR_ERR(p); 550ffc40f56SKevin Coffman gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES; 5513b68aaeaSTrond Myklebust goto err_release_msg; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 5543b68aaeaSTrond Myklebust err = mlen; 5553b68aaeaSTrond Myklebust 5563b68aaeaSTrond Myklebust err_release_msg: 5573b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5581da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 559b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5601da177e4SLinus Torvalds gss_release_msg(gss_msg); 5611da177e4SLinus Torvalds err_put_ctx: 5621da177e4SLinus Torvalds gss_put_ctx(ctx); 5631da177e4SLinus Torvalds err: 5641da177e4SLinus Torvalds kfree(buf); 5651da177e4SLinus Torvalds out: 5663b68aaeaSTrond Myklebust dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 5671da177e4SLinus Torvalds return err; 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds static void 5711da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 5721da177e4SLinus Torvalds { 5731da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 5741da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5751da177e4SLinus Torvalds 5766e84c7b6STrond Myklebust spin_lock(&inode->i_lock); 5776e84c7b6STrond Myklebust while (!list_empty(&rpci->in_downcall)) { 5786e84c7b6STrond Myklebust 5796e84c7b6STrond Myklebust gss_msg = list_entry(rpci->in_downcall.next, 5801da177e4SLinus Torvalds struct gss_upcall_msg, list); 5811da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 5821da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5831da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 584b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5851da177e4SLinus Torvalds gss_release_msg(gss_msg); 586b185f835STrond Myklebust spin_lock(&inode->i_lock); 5871da177e4SLinus Torvalds } 588b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5891da177e4SLinus Torvalds } 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds static void 5921da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 5931da177e4SLinus Torvalds { 5941da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 5951da177e4SLinus Torvalds static unsigned long ratelimit; 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds if (msg->errno < 0) { 5981da177e4SLinus Torvalds dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 5991da177e4SLinus Torvalds gss_msg); 6001da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 6011da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 60248e49187STrond Myklebust if (msg->errno == -ETIMEDOUT) { 6031da177e4SLinus Torvalds unsigned long now = jiffies; 6041da177e4SLinus Torvalds if (time_after(now, ratelimit)) { 6051da177e4SLinus Torvalds printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 6061da177e4SLinus Torvalds "Please check user daemon is running!\n"); 6071da177e4SLinus Torvalds ratelimit = now + 15*HZ; 6081da177e4SLinus Torvalds } 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds gss_release_msg(gss_msg); 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds /* 6151da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 6161da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 6171da177e4SLinus Torvalds */ 6181da177e4SLinus Torvalds static struct rpc_auth * 6191da177e4SLinus Torvalds gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 6201da177e4SLinus Torvalds { 6211da177e4SLinus Torvalds struct gss_auth *gss_auth; 6221da177e4SLinus Torvalds struct rpc_auth * auth; 6236a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 6286a19275aSJ. Bruce Fields return ERR_PTR(err); 6291da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 6301da177e4SLinus Torvalds goto out_dec; 6311da177e4SLinus Torvalds gss_auth->client = clnt; 6326a19275aSJ. Bruce Fields err = -EINVAL; 6331da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 6341da177e4SLinus Torvalds if (!gss_auth->mech) { 6353392c349SJames Morris printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", 6361da177e4SLinus Torvalds __FUNCTION__, flavor); 6371da177e4SLinus Torvalds goto err_free; 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 640438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 641438b6fdeSJ. Bruce Fields goto err_put_mech; 6421da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 6431da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 6441da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 6451da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 6461da177e4SLinus Torvalds auth->au_flavor = flavor; 6471da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 6480285ed1fSTrond Myklebust kref_init(&gss_auth->kref); 6491da177e4SLinus Torvalds 650158998b6STrond Myklebust gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, 651158998b6STrond Myklebust clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 6526a19275aSJ. Bruce Fields if (IS_ERR(gss_auth->dentry)) { 6536a19275aSJ. Bruce Fields err = PTR_ERR(gss_auth->dentry); 6541da177e4SLinus Torvalds goto err_put_mech; 6556a19275aSJ. Bruce Fields } 6561da177e4SLinus Torvalds 657f5c2187cSTrond Myklebust err = rpcauth_init_credcache(auth); 65807a2bf1dSTrond Myklebust if (err) 65907a2bf1dSTrond Myklebust goto err_unlink_pipe; 66007a2bf1dSTrond Myklebust 6611da177e4SLinus Torvalds return auth; 66207a2bf1dSTrond Myklebust err_unlink_pipe: 66307a2bf1dSTrond Myklebust rpc_unlink(gss_auth->dentry); 6641da177e4SLinus Torvalds err_put_mech: 6651da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 6661da177e4SLinus Torvalds err_free: 6671da177e4SLinus Torvalds kfree(gss_auth); 6681da177e4SLinus Torvalds out_dec: 6691da177e4SLinus Torvalds module_put(THIS_MODULE); 6706a19275aSJ. Bruce Fields return ERR_PTR(err); 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds static void 6740285ed1fSTrond Myklebust gss_free(struct gss_auth *gss_auth) 6750285ed1fSTrond Myklebust { 6760285ed1fSTrond Myklebust rpc_unlink(gss_auth->dentry); 6770285ed1fSTrond Myklebust gss_auth->dentry = NULL; 6780285ed1fSTrond Myklebust gss_mech_put(gss_auth->mech); 6790285ed1fSTrond Myklebust 6800285ed1fSTrond Myklebust kfree(gss_auth); 6810285ed1fSTrond Myklebust module_put(THIS_MODULE); 6820285ed1fSTrond Myklebust } 6830285ed1fSTrond Myklebust 6840285ed1fSTrond Myklebust static void 6850285ed1fSTrond Myklebust gss_free_callback(struct kref *kref) 6860285ed1fSTrond Myklebust { 6870285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 6880285ed1fSTrond Myklebust 6890285ed1fSTrond Myklebust gss_free(gss_auth); 6900285ed1fSTrond Myklebust } 6910285ed1fSTrond Myklebust 6920285ed1fSTrond Myklebust static void 6931da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 6941da177e4SLinus Torvalds { 6951da177e4SLinus Torvalds struct gss_auth *gss_auth; 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 6981da177e4SLinus Torvalds auth, auth->au_flavor); 6991da177e4SLinus Torvalds 7003ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 7013ab9bb72STrond Myklebust 7021da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 7030285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 7041da177e4SLinus Torvalds } 7051da177e4SLinus Torvalds 7060df7fb74STrond Myklebust /* 7070df7fb74STrond Myklebust * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 7080df7fb74STrond Myklebust * to the server with the GSS control procedure field set to 7090df7fb74STrond Myklebust * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 7100df7fb74STrond Myklebust * all RPCSEC_GSS state associated with that context. 7110df7fb74STrond Myklebust */ 7120df7fb74STrond Myklebust static int 7130df7fb74STrond Myklebust gss_destroying_context(struct rpc_cred *cred) 7140df7fb74STrond Myklebust { 7150df7fb74STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 7160df7fb74STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 7170df7fb74STrond Myklebust struct rpc_task *task; 7180df7fb74STrond Myklebust 7190df7fb74STrond Myklebust if (gss_cred->gc_ctx == NULL || 720080a1f14STrond Myklebust test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 7210df7fb74STrond Myklebust return 0; 7220df7fb74STrond Myklebust 7230df7fb74STrond Myklebust gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 7240df7fb74STrond Myklebust cred->cr_ops = &gss_nullops; 7250df7fb74STrond Myklebust 7260df7fb74STrond Myklebust /* Take a reference to ensure the cred will be destroyed either 7270df7fb74STrond Myklebust * by the RPC call or by the put_rpccred() below */ 7280df7fb74STrond Myklebust get_rpccred(cred); 7290df7fb74STrond Myklebust 730080a1f14STrond Myklebust task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 7310df7fb74STrond Myklebust if (!IS_ERR(task)) 7320df7fb74STrond Myklebust rpc_put_task(task); 7330df7fb74STrond Myklebust 7340df7fb74STrond Myklebust put_rpccred(cred); 7350df7fb74STrond Myklebust return 1; 7360df7fb74STrond Myklebust } 7370df7fb74STrond Myklebust 7380df7fb74STrond Myklebust /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 7391da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 7401da177e4SLinus Torvalds * allocated before freeing them. */ 7411da177e4SLinus Torvalds static void 7425d28dc82STrond Myklebust gss_do_free_ctx(struct gss_cl_ctx *ctx) 7431da177e4SLinus Torvalds { 7445d28dc82STrond Myklebust dprintk("RPC: gss_free_ctx\n"); 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 7471da177e4SLinus Torvalds kfree(ctx); 7481da177e4SLinus Torvalds } 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds static void 7515d28dc82STrond Myklebust gss_free_ctx_callback(struct rcu_head *head) 7525d28dc82STrond Myklebust { 7535d28dc82STrond Myklebust struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 7545d28dc82STrond Myklebust gss_do_free_ctx(ctx); 7555d28dc82STrond Myklebust } 7565d28dc82STrond Myklebust 7575d28dc82STrond Myklebust static void 7585d28dc82STrond Myklebust gss_free_ctx(struct gss_cl_ctx *ctx) 7595d28dc82STrond Myklebust { 760a4deb81bSTrond Myklebust struct gss_ctx *gc_gss_ctx; 761a4deb81bSTrond Myklebust 762a4deb81bSTrond Myklebust gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); 763a4deb81bSTrond Myklebust rcu_assign_pointer(ctx->gc_gss_ctx, NULL); 7645d28dc82STrond Myklebust call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 765a4deb81bSTrond Myklebust if (gc_gss_ctx) 766a4deb81bSTrond Myklebust gss_delete_sec_context(&gc_gss_ctx); 7675d28dc82STrond Myklebust } 7685d28dc82STrond Myklebust 7695d28dc82STrond Myklebust static void 77031be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 7711da177e4SLinus Torvalds { 77231be5bf1STrond Myklebust dprintk("RPC: gss_free_cred %p\n", gss_cred); 77331be5bf1STrond Myklebust kfree(gss_cred); 77431be5bf1STrond Myklebust } 7751da177e4SLinus Torvalds 77631be5bf1STrond Myklebust static void 77731be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 77831be5bf1STrond Myklebust { 77931be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 78031be5bf1STrond Myklebust gss_free_cred(gss_cred); 78131be5bf1STrond Myklebust } 7821da177e4SLinus Torvalds 78331be5bf1STrond Myklebust static void 78431be5bf1STrond Myklebust gss_destroy_cred(struct rpc_cred *cred) 78531be5bf1STrond Myklebust { 7865d28dc82STrond Myklebust struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 7870285ed1fSTrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 7885d28dc82STrond Myklebust struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 7895d28dc82STrond Myklebust 7900df7fb74STrond Myklebust if (gss_destroying_context(cred)) 7910df7fb74STrond Myklebust return; 7925d28dc82STrond Myklebust rcu_assign_pointer(gss_cred->gc_ctx, NULL); 79331be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 7945d28dc82STrond Myklebust if (ctx) 7955d28dc82STrond Myklebust gss_put_ctx(ctx); 7960285ed1fSTrond Myklebust kref_put(&gss_auth->kref, gss_free_callback); 7971da177e4SLinus Torvalds } 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds /* 8001da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 8011da177e4SLinus Torvalds */ 8021da177e4SLinus Torvalds static struct rpc_cred * 8038a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 8041da177e4SLinus Torvalds { 8058a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds static struct rpc_cred * 8098a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 8101da177e4SLinus Torvalds { 8111da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 8121da177e4SLinus Torvalds struct gss_cred *cred = NULL; 8131da177e4SLinus Torvalds int err = -ENOMEM; 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvalds dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 8161da177e4SLinus Torvalds acred->uid, auth->au_flavor); 8171da177e4SLinus Torvalds 8180da974f4SPanagiotis Issaris if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL))) 8191da177e4SLinus Torvalds goto out_err; 8201da177e4SLinus Torvalds 8215fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 8221da177e4SLinus Torvalds /* 8231da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 8241da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 8251da177e4SLinus Torvalds */ 826fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 8271da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 8287c67db3aSTrond Myklebust cred->gc_machine_cred = acred->machine_cred; 8290285ed1fSTrond Myklebust kref_get(&gss_auth->kref); 8301da177e4SLinus Torvalds return &cred->gc_base; 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds out_err: 8331da177e4SLinus Torvalds dprintk("RPC: gss_create_cred failed with error %d\n", err); 8341da177e4SLinus Torvalds return ERR_PTR(err); 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds static int 838fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 839fba3bad4STrond Myklebust { 840fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 841fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 842fba3bad4STrond Myklebust int err; 843fba3bad4STrond Myklebust 844fba3bad4STrond Myklebust do { 845fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 846fba3bad4STrond Myklebust } while (err == -EAGAIN); 847fba3bad4STrond Myklebust return err; 848fba3bad4STrond Myklebust } 849fba3bad4STrond Myklebust 850fba3bad4STrond Myklebust static int 8518a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 8521da177e4SLinus Torvalds { 8531da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 8541da177e4SLinus Torvalds 8558a317760STrond Myklebust /* 8568a317760STrond Myklebust * If the searchflags have set RPCAUTH_LOOKUP_NEW, then 8578a317760STrond Myklebust * we don't really care if the credential has expired or not, 8588a317760STrond Myklebust * since the caller should be prepared to reinitialise it. 8598a317760STrond Myklebust */ 860fc432dd9STrond Myklebust if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 8618a317760STrond Myklebust goto out; 8621da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 8631da177e4SLinus Torvalds if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 8641da177e4SLinus Torvalds return 0; 8658a317760STrond Myklebust out: 8667c67db3aSTrond Myklebust if (acred->machine_cred != gss_cred->gc_machine_cred) 8677c67db3aSTrond Myklebust return 0; 8681da177e4SLinus Torvalds return (rc->cr_uid == acred->uid); 8691da177e4SLinus Torvalds } 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds /* 8721da177e4SLinus Torvalds * Marshal credentials. 8731da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 8741da177e4SLinus Torvalds */ 875d8ed029dSAlexey Dobriyan static __be32 * 876d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 8771da177e4SLinus Torvalds { 8781da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 8791da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 8801da177e4SLinus Torvalds gc_base); 8811da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 882d8ed029dSAlexey Dobriyan __be32 *cred_len; 8831da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8841da177e4SLinus Torvalds u32 maj_stat = 0; 8851da177e4SLinus Torvalds struct xdr_netobj mic; 8861da177e4SLinus Torvalds struct kvec iov; 8871da177e4SLinus Torvalds struct xdr_buf verf_buf; 8881da177e4SLinus Torvalds 8898885cb36SChuck Lever dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8921da177e4SLinus Torvalds cred_len = p++; 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 8951da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 8961da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 8991da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 9001da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 9011da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 9021da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 9031da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 9041da177e4SLinus Torvalds 9051da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 9061da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 907808012fbSChuck Lever iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 908808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 9091da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 9101da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds /* set verifier flavor*/ 9131da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 91600fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 9171da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 918fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 9191da177e4SLinus Torvalds } else if (maj_stat != 0) { 9201da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 9211da177e4SLinus Torvalds goto out_put_ctx; 9221da177e4SLinus Torvalds } 9231da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 9241da177e4SLinus Torvalds gss_put_ctx(ctx); 9251da177e4SLinus Torvalds return p; 9261da177e4SLinus Torvalds out_put_ctx: 9271da177e4SLinus Torvalds gss_put_ctx(ctx); 9281da177e4SLinus Torvalds return NULL; 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds /* 9321da177e4SLinus Torvalds * Refresh credentials. XXX - finish 9331da177e4SLinus Torvalds */ 9341da177e4SLinus Torvalds static int 9351da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 9361da177e4SLinus Torvalds { 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) 9391da177e4SLinus Torvalds return gss_refresh_upcall(task); 9401da177e4SLinus Torvalds return 0; 9411da177e4SLinus Torvalds } 9421da177e4SLinus Torvalds 9430df7fb74STrond Myklebust /* Dummy refresh routine: used only when destroying the context */ 9440df7fb74STrond Myklebust static int 9450df7fb74STrond Myklebust gss_refresh_null(struct rpc_task *task) 9460df7fb74STrond Myklebust { 9470df7fb74STrond Myklebust return -EACCES; 9480df7fb74STrond Myklebust } 9490df7fb74STrond Myklebust 950d8ed029dSAlexey Dobriyan static __be32 * 951d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 9521da177e4SLinus Torvalds { 9531da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 9541da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 955d8ed029dSAlexey Dobriyan __be32 seq; 9561da177e4SLinus Torvalds struct kvec iov; 9571da177e4SLinus Torvalds struct xdr_buf verf_buf; 9581da177e4SLinus Torvalds struct xdr_netobj mic; 9591da177e4SLinus Torvalds u32 flav,len; 9601da177e4SLinus Torvalds u32 maj_stat; 9611da177e4SLinus Torvalds 9628885cb36SChuck Lever dprintk("RPC: %5u gss_validate\n", task->tk_pid); 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds flav = ntohl(*p++); 9651da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 9661da177e4SLinus Torvalds goto out_bad; 9671da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 9681da177e4SLinus Torvalds goto out_bad; 9691da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 9701da177e4SLinus Torvalds iov.iov_base = &seq; 9711da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 9721da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 9731da177e4SLinus Torvalds mic.data = (u8 *)p; 9741da177e4SLinus Torvalds mic.len = len; 9751da177e4SLinus Torvalds 97600fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 9771da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 978fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 9790df7fb74STrond Myklebust if (maj_stat) { 9800df7fb74STrond Myklebust dprintk("RPC: %5u gss_validate: gss_verify_mic returned " 9810df7fb74STrond Myklebust "error 0x%08x\n", task->tk_pid, maj_stat); 9821da177e4SLinus Torvalds goto out_bad; 9830df7fb74STrond Myklebust } 98424b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 98524b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 9861be27f36STrond Myklebust cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 9871da177e4SLinus Torvalds gss_put_ctx(ctx); 9888885cb36SChuck Lever dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 9891da177e4SLinus Torvalds task->tk_pid); 9901da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 9911da177e4SLinus Torvalds out_bad: 9921da177e4SLinus Torvalds gss_put_ctx(ctx); 9938885cb36SChuck Lever dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 9941da177e4SLinus Torvalds return NULL; 9951da177e4SLinus Torvalds } 9961da177e4SLinus Torvalds 9971da177e4SLinus Torvalds static inline int 9981da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 999d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 10001da177e4SLinus Torvalds { 10011da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 10021da177e4SLinus Torvalds struct xdr_buf integ_buf; 1003d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 10041da177e4SLinus Torvalds struct xdr_netobj mic; 1005d8ed029dSAlexey Dobriyan u32 offset; 1006d8ed029dSAlexey Dobriyan __be32 *q; 10071da177e4SLinus Torvalds struct kvec *iov; 10081da177e4SLinus Torvalds u32 maj_stat = 0; 10091da177e4SLinus Torvalds int status = -EIO; 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds integ_len = p++; 10121da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 10131da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 10141da177e4SLinus Torvalds 1015be879c4eSJ. Bruce Fields status = rpc_call_xdrproc(encode, rqstp, p, obj); 10161da177e4SLinus Torvalds if (status) 10171da177e4SLinus Torvalds return status; 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 10201da177e4SLinus Torvalds offset, snd_buf->len - offset)) 10211da177e4SLinus Torvalds return status; 10221da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 10251da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 10261da177e4SLinus Torvalds iov = snd_buf->tail; 10271da177e4SLinus Torvalds else 10281da177e4SLinus Torvalds iov = snd_buf->head; 10291da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 10301da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 10311da177e4SLinus Torvalds 103200fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 10331da177e4SLinus Torvalds status = -EIO; /* XXX? */ 10341da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1035fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 10361da177e4SLinus Torvalds else if (maj_stat) 10371da177e4SLinus Torvalds return status; 10381da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 10391da177e4SLinus Torvalds 10401da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 10411da177e4SLinus Torvalds iov->iov_len += offset; 10421da177e4SLinus Torvalds snd_buf->len += offset; 10431da177e4SLinus Torvalds return 0; 10441da177e4SLinus Torvalds } 10451da177e4SLinus Torvalds 10462d2da60cSJ. Bruce Fields static void 10472d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 10482d2da60cSJ. Bruce Fields { 10492d2da60cSJ. Bruce Fields int i; 10502d2da60cSJ. Bruce Fields 10512d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 10522d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 10532d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 10542d2da60cSJ. Bruce Fields } 10552d2da60cSJ. Bruce Fields 10562d2da60cSJ. Bruce Fields static int 10572d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 10582d2da60cSJ. Bruce Fields { 10592d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 10602d2da60cSJ. Bruce Fields int first, last, i; 10612d2da60cSJ. Bruce Fields 10622d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 10632d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 10642d2da60cSJ. Bruce Fields return 0; 10652d2da60cSJ. Bruce Fields } 10662d2da60cSJ. Bruce Fields 10672d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 10682d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 10692d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 10702d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 10712d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 10722d2da60cSJ. Bruce Fields GFP_NOFS); 10732d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 10742d2da60cSJ. Bruce Fields goto out; 10752d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 10762d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 10772d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 10782d2da60cSJ. Bruce Fields goto out_free; 10792d2da60cSJ. Bruce Fields } 10802d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 10812d2da60cSJ. Bruce Fields return 0; 10822d2da60cSJ. Bruce Fields out_free: 10832d2da60cSJ. Bruce Fields for (i--; i >= 0; i--) { 10842d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 10852d2da60cSJ. Bruce Fields } 10862d2da60cSJ. Bruce Fields out: 10872d2da60cSJ. Bruce Fields return -EAGAIN; 10882d2da60cSJ. Bruce Fields } 10892d2da60cSJ. Bruce Fields 10902d2da60cSJ. Bruce Fields static inline int 10912d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1092d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 10932d2da60cSJ. Bruce Fields { 10942d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 10952d2da60cSJ. Bruce Fields u32 offset; 10962d2da60cSJ. Bruce Fields u32 maj_stat; 10972d2da60cSJ. Bruce Fields int status; 1098d8ed029dSAlexey Dobriyan __be32 *opaque_len; 10992d2da60cSJ. Bruce Fields struct page **inpages; 11002d2da60cSJ. Bruce Fields int first; 11012d2da60cSJ. Bruce Fields int pad; 11022d2da60cSJ. Bruce Fields struct kvec *iov; 11032d2da60cSJ. Bruce Fields char *tmp; 11042d2da60cSJ. Bruce Fields 11052d2da60cSJ. Bruce Fields opaque_len = p++; 11062d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 11072d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 11082d2da60cSJ. Bruce Fields 1109be879c4eSJ. Bruce Fields status = rpc_call_xdrproc(encode, rqstp, p, obj); 11102d2da60cSJ. Bruce Fields if (status) 11112d2da60cSJ. Bruce Fields return status; 11122d2da60cSJ. Bruce Fields 11132d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 11142d2da60cSJ. Bruce Fields if (status) 11152d2da60cSJ. Bruce Fields return status; 11162d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 11172d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 11182d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 11192d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 11202d2da60cSJ. Bruce Fields /* Give the tail its own page, in case we need extra space in the 11212d2da60cSJ. Bruce Fields * head when wrapping: */ 11222d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 11232d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 11242d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 11252d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 11262d2da60cSJ. Bruce Fields } 112700fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 11282d2da60cSJ. Bruce Fields /* RPC_SLACK_SPACE should prevent this ever happening: */ 11292d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 11302d2da60cSJ. Bruce Fields status = -EIO; 11312d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 11322d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 11332d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1134fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11352d2da60cSJ. Bruce Fields else if (maj_stat) 11362d2da60cSJ. Bruce Fields return status; 11372d2da60cSJ. Bruce Fields 11382d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 11392d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 11402d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 11412d2da60cSJ. Bruce Fields iov = snd_buf->tail; 11422d2da60cSJ. Bruce Fields else 11432d2da60cSJ. Bruce Fields iov = snd_buf->head; 11442d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 11452d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 11462d2da60cSJ. Bruce Fields memset(p, 0, pad); 11472d2da60cSJ. Bruce Fields iov->iov_len += pad; 11482d2da60cSJ. Bruce Fields snd_buf->len += pad; 11492d2da60cSJ. Bruce Fields 11502d2da60cSJ. Bruce Fields return 0; 11512d2da60cSJ. Bruce Fields } 11522d2da60cSJ. Bruce Fields 11531da177e4SLinus Torvalds static int 11541da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 1155d8ed029dSAlexey Dobriyan kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 11561da177e4SLinus Torvalds { 11571da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 11581da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 11591da177e4SLinus Torvalds gc_base); 11601da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 11611da177e4SLinus Torvalds int status = -EIO; 11621da177e4SLinus Torvalds 11638885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 11641da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 11651da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 11661da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 11671da177e4SLinus Torvalds */ 1168be879c4eSJ. Bruce Fields status = rpc_call_xdrproc(encode, rqstp, p, obj); 11691da177e4SLinus Torvalds goto out; 11701da177e4SLinus Torvalds } 11711da177e4SLinus Torvalds switch (gss_cred->gc_service) { 11721da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 1173be879c4eSJ. Bruce Fields status = rpc_call_xdrproc(encode, rqstp, p, obj); 11741da177e4SLinus Torvalds break; 11751da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 11761da177e4SLinus Torvalds status = gss_wrap_req_integ(cred, ctx, encode, 11771da177e4SLinus Torvalds rqstp, p, obj); 11781da177e4SLinus Torvalds break; 11791da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 11802d2da60cSJ. Bruce Fields status = gss_wrap_req_priv(cred, ctx, encode, 11812d2da60cSJ. Bruce Fields rqstp, p, obj); 11821da177e4SLinus Torvalds break; 11831da177e4SLinus Torvalds } 11841da177e4SLinus Torvalds out: 11851da177e4SLinus Torvalds gss_put_ctx(ctx); 11868885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 11871da177e4SLinus Torvalds return status; 11881da177e4SLinus Torvalds } 11891da177e4SLinus Torvalds 11901da177e4SLinus Torvalds static inline int 11911da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1192d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 11931da177e4SLinus Torvalds { 11941da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 11951da177e4SLinus Torvalds struct xdr_buf integ_buf; 11961da177e4SLinus Torvalds struct xdr_netobj mic; 11971da177e4SLinus Torvalds u32 data_offset, mic_offset; 11981da177e4SLinus Torvalds u32 integ_len; 11991da177e4SLinus Torvalds u32 maj_stat; 12001da177e4SLinus Torvalds int status = -EIO; 12011da177e4SLinus Torvalds 12021da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 12031da177e4SLinus Torvalds if (integ_len & 3) 12041da177e4SLinus Torvalds return status; 12051da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 12061da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 12071da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 12081da177e4SLinus Torvalds return status; 12091da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 12101da177e4SLinus Torvalds return status; 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 12131da177e4SLinus Torvalds mic_offset - data_offset)) 12141da177e4SLinus Torvalds return status; 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 12171da177e4SLinus Torvalds return status; 12181da177e4SLinus Torvalds 121900fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 12201da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1221fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 12221da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 12231da177e4SLinus Torvalds return status; 12241da177e4SLinus Torvalds return 0; 12251da177e4SLinus Torvalds } 12261da177e4SLinus Torvalds 12272d2da60cSJ. Bruce Fields static inline int 12282d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1229d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 12302d2da60cSJ. Bruce Fields { 12312d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 12322d2da60cSJ. Bruce Fields u32 offset; 12332d2da60cSJ. Bruce Fields u32 opaque_len; 12342d2da60cSJ. Bruce Fields u32 maj_stat; 12352d2da60cSJ. Bruce Fields int status = -EIO; 12362d2da60cSJ. Bruce Fields 12372d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 12382d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 12392d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 12402d2da60cSJ. Bruce Fields return status; 12412d2da60cSJ. Bruce Fields /* remove padding: */ 12422d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 12432d2da60cSJ. Bruce Fields 124400fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 12452d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1246fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 12472d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 12482d2da60cSJ. Bruce Fields return status; 12492d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 12502d2da60cSJ. Bruce Fields return status; 12512d2da60cSJ. Bruce Fields 12522d2da60cSJ. Bruce Fields return 0; 12532d2da60cSJ. Bruce Fields } 12542d2da60cSJ. Bruce Fields 12552d2da60cSJ. Bruce Fields 12561da177e4SLinus Torvalds static int 12571da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1258d8ed029dSAlexey Dobriyan kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 12591da177e4SLinus Torvalds { 12601da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 12611da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 12621da177e4SLinus Torvalds gc_base); 12631da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1264d8ed029dSAlexey Dobriyan __be32 *savedp = p; 12652d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 12662d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 12671da177e4SLinus Torvalds int status = -EIO; 12681da177e4SLinus Torvalds 12691da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 12701da177e4SLinus Torvalds goto out_decode; 12711da177e4SLinus Torvalds switch (gss_cred->gc_service) { 12721da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 12731da177e4SLinus Torvalds break; 12741da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 12751da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 12761da177e4SLinus Torvalds if (status) 12771da177e4SLinus Torvalds goto out; 12781da177e4SLinus Torvalds break; 12791da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 12802d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 12812d2da60cSJ. Bruce Fields if (status) 12822d2da60cSJ. Bruce Fields goto out; 12831da177e4SLinus Torvalds break; 12841da177e4SLinus Torvalds } 128524b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 12861be27f36STrond Myklebust cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 12872d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 12881da177e4SLinus Torvalds out_decode: 1289be879c4eSJ. Bruce Fields status = rpc_call_xdrproc(decode, rqstp, p, obj); 12901da177e4SLinus Torvalds out: 12911da177e4SLinus Torvalds gss_put_ctx(ctx); 12928885cb36SChuck Lever dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 12931da177e4SLinus Torvalds status); 12941da177e4SLinus Torvalds return status; 12951da177e4SLinus Torvalds } 12961da177e4SLinus Torvalds 1297f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 12981da177e4SLinus Torvalds .owner = THIS_MODULE, 12991da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 13001da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 13011da177e4SLinus Torvalds .create = gss_create, 13021da177e4SLinus Torvalds .destroy = gss_destroy, 13031da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 13041da177e4SLinus Torvalds .crcreate = gss_create_cred 13051da177e4SLinus Torvalds }; 13061da177e4SLinus Torvalds 1307f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 13081da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 13091da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1310fba3bad4STrond Myklebust .cr_init = gss_cred_init, 13115c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 13121da177e4SLinus Torvalds .crmatch = gss_match, 13131da177e4SLinus Torvalds .crmarshal = gss_marshal, 13141da177e4SLinus Torvalds .crrefresh = gss_refresh, 13151da177e4SLinus Torvalds .crvalidate = gss_validate, 13161da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 13171da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 13181da177e4SLinus Torvalds }; 13191da177e4SLinus Torvalds 13200df7fb74STrond Myklebust static const struct rpc_credops gss_nullops = { 13210df7fb74STrond Myklebust .cr_name = "AUTH_GSS", 13220df7fb74STrond Myklebust .crdestroy = gss_destroy_cred, 13235c691044STrond Myklebust .crbind = rpcauth_generic_bind_cred, 13240df7fb74STrond Myklebust .crmatch = gss_match, 13250df7fb74STrond Myklebust .crmarshal = gss_marshal, 13260df7fb74STrond Myklebust .crrefresh = gss_refresh_null, 13270df7fb74STrond Myklebust .crvalidate = gss_validate, 13280df7fb74STrond Myklebust .crwrap_req = gss_wrap_req, 13290df7fb74STrond Myklebust .crunwrap_resp = gss_unwrap_resp, 13300df7fb74STrond Myklebust }; 13310df7fb74STrond Myklebust 13321da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops = { 13331da177e4SLinus Torvalds .upcall = gss_pipe_upcall, 13341da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 13351da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 13361da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 13371da177e4SLinus Torvalds }; 13381da177e4SLinus Torvalds 13391da177e4SLinus Torvalds /* 13401da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 13411da177e4SLinus Torvalds */ 13421da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 13431da177e4SLinus Torvalds { 13441da177e4SLinus Torvalds int err = 0; 13451da177e4SLinus Torvalds 13461da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 13471da177e4SLinus Torvalds if (err) 13481da177e4SLinus Torvalds goto out; 13491da177e4SLinus Torvalds err = gss_svc_init(); 13501da177e4SLinus Torvalds if (err) 13511da177e4SLinus Torvalds goto out_unregister; 13521da177e4SLinus Torvalds return 0; 13531da177e4SLinus Torvalds out_unregister: 13541da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 13551da177e4SLinus Torvalds out: 13561da177e4SLinus Torvalds return err; 13571da177e4SLinus Torvalds } 13581da177e4SLinus Torvalds 13591da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 13601da177e4SLinus Torvalds { 13611da177e4SLinus Torvalds gss_svc_shutdown(); 13621da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 13631da177e4SLinus Torvalds } 13641da177e4SLinus Torvalds 13651da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 13661da177e4SLinus Torvalds module_init(init_rpcsec_gss) 13671da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1368