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 static DEFINE_RWLOCK(gss_ctx_lock); 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds struct gss_auth { 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 911da177e4SLinus Torvalds static void gss_destroy_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)) 1051da177e4SLinus Torvalds gss_destroy_ctx(ctx); 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds static void 1091da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1101da177e4SLinus Torvalds { 1111da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1121da177e4SLinus Torvalds struct gss_cl_ctx *old; 1131da177e4SLinus Torvalds write_lock(&gss_ctx_lock); 1141da177e4SLinus Torvalds old = gss_cred->gc_ctx; 1151da177e4SLinus Torvalds gss_cred->gc_ctx = ctx; 116fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 117fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1181da177e4SLinus Torvalds write_unlock(&gss_ctx_lock); 1191da177e4SLinus Torvalds if (old) 1201da177e4SLinus Torvalds gss_put_ctx(old); 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds static int 1241da177e4SLinus Torvalds gss_cred_is_uptodate_ctx(struct rpc_cred *cred) 1251da177e4SLinus Torvalds { 1261da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1271da177e4SLinus Torvalds int res = 0; 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds read_lock(&gss_ctx_lock); 130fc432dd9STrond Myklebust if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx) 1311da177e4SLinus Torvalds res = 1; 1321da177e4SLinus Torvalds read_unlock(&gss_ctx_lock); 1331da177e4SLinus Torvalds return res; 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds static const void * 1371da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1381da177e4SLinus Torvalds { 1391da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1401da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1411da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1421da177e4SLinus Torvalds memcpy(res, p, len); 1431da177e4SLinus Torvalds return q; 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds static inline const void * 1471da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1481da177e4SLinus Torvalds { 1491da177e4SLinus Torvalds const void *q; 1501da177e4SLinus Torvalds unsigned int len; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1531da177e4SLinus Torvalds if (IS_ERR(p)) 1541da177e4SLinus Torvalds return p; 1551da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1561da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1571da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 158e69062b4SArnaldo Carvalho de Melo dest->data = kmemdup(p, len, GFP_KERNEL); 1591da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1601da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1611da177e4SLinus Torvalds dest->len = len; 1621da177e4SLinus Torvalds return q; 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds static struct gss_cl_ctx * 1661da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1671da177e4SLinus Torvalds { 1681da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1691da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds read_lock(&gss_ctx_lock); 1721da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1731da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1741da177e4SLinus Torvalds read_unlock(&gss_ctx_lock); 1751da177e4SLinus Torvalds return ctx; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds static struct gss_cl_ctx * 1791da177e4SLinus Torvalds gss_alloc_context(void) 1801da177e4SLinus Torvalds { 1811da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1821da177e4SLinus Torvalds 1830da974f4SPanagiotis Issaris ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 1841da177e4SLinus Torvalds if (ctx != NULL) { 1851da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 1861da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 1871da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 1881da177e4SLinus Torvalds atomic_set(&ctx->count,1); 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds return ctx; 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 1941da177e4SLinus Torvalds static const void * 1951da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 1961da177e4SLinus Torvalds { 1971da177e4SLinus Torvalds const void *q; 1981da177e4SLinus Torvalds unsigned int seclen; 1991da177e4SLinus Torvalds unsigned int timeout; 2001da177e4SLinus Torvalds u32 window_size; 2011da177e4SLinus Torvalds int ret; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* First unsigned int gives the lifetime (in seconds) of the cred */ 2041da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2051da177e4SLinus Torvalds if (IS_ERR(p)) 2061da177e4SLinus Torvalds goto err; 2071da177e4SLinus Torvalds if (timeout == 0) 2081da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 2091da177e4SLinus Torvalds ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 2101da177e4SLinus Torvalds /* Sequence number window. Determines the maximum number of simultaneous requests */ 2111da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2121da177e4SLinus Torvalds if (IS_ERR(p)) 2131da177e4SLinus Torvalds goto err; 2141da177e4SLinus Torvalds ctx->gc_win = window_size; 2151da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2161da177e4SLinus Torvalds if (ctx->gc_win == 0) { 2171da177e4SLinus Torvalds /* in which case, p points to an error code which we ignore */ 2181da177e4SLinus Torvalds p = ERR_PTR(-EACCES); 2191da177e4SLinus Torvalds goto err; 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds /* copy the opaque wire context */ 2221da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2231da177e4SLinus Torvalds if (IS_ERR(p)) 2241da177e4SLinus Torvalds goto err; 2251da177e4SLinus Torvalds /* import the opaque security context */ 2261da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2271da177e4SLinus Torvalds if (IS_ERR(p)) 2281da177e4SLinus Torvalds goto err; 2291da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2301da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2311da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2321da177e4SLinus Torvalds goto err; 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 2351da177e4SLinus Torvalds if (ret < 0) { 2361da177e4SLinus Torvalds p = ERR_PTR(ret); 2371da177e4SLinus Torvalds goto err; 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds return q; 2401da177e4SLinus Torvalds err: 2411da177e4SLinus Torvalds dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 2421da177e4SLinus Torvalds return p; 2431da177e4SLinus Torvalds } 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds struct gss_upcall_msg { 2471da177e4SLinus Torvalds atomic_t count; 2481da177e4SLinus Torvalds uid_t uid; 2491da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2501da177e4SLinus Torvalds struct list_head list; 2511da177e4SLinus Torvalds struct gss_auth *auth; 2521da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2531da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2541da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 2551da177e4SLinus Torvalds }; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds static void 2581da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 2591da177e4SLinus Torvalds { 2601da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 2611da177e4SLinus Torvalds return; 2621da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 2631da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 2641da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 2651da177e4SLinus Torvalds kfree(gss_msg); 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds static struct gss_upcall_msg * 2696e84c7b6STrond Myklebust __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds struct gss_upcall_msg *pos; 2726e84c7b6STrond Myklebust list_for_each_entry(pos, &rpci->in_downcall, list) { 2731da177e4SLinus Torvalds if (pos->uid != uid) 2741da177e4SLinus Torvalds continue; 2751da177e4SLinus Torvalds atomic_inc(&pos->count); 2761da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found msg %p\n", pos); 2771da177e4SLinus Torvalds return pos; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found nothing\n"); 2801da177e4SLinus Torvalds return NULL; 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds /* Try to add a upcall to the pipefs queue. 2841da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 2851da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 2861da177e4SLinus Torvalds */ 2871da177e4SLinus Torvalds static inline struct gss_upcall_msg * 2881da177e4SLinus Torvalds gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) 2891da177e4SLinus Torvalds { 290b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 2916e84c7b6STrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 2921da177e4SLinus Torvalds struct gss_upcall_msg *old; 2931da177e4SLinus Torvalds 294b185f835STrond Myklebust spin_lock(&inode->i_lock); 2956e84c7b6STrond Myklebust old = __gss_find_upcall(rpci, gss_msg->uid); 2961da177e4SLinus Torvalds if (old == NULL) { 2971da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 2986e84c7b6STrond Myklebust list_add(&gss_msg->list, &rpci->in_downcall); 2991da177e4SLinus Torvalds } else 3001da177e4SLinus Torvalds gss_msg = old; 301b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3021da177e4SLinus Torvalds return gss_msg; 3031da177e4SLinus Torvalds } 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds static void 3061da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3071da177e4SLinus Torvalds { 3081da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3091da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3101da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3111da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds static void 3151da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3161da177e4SLinus Torvalds { 3171da177e4SLinus Torvalds struct gss_auth *gss_auth = gss_msg->auth; 318b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 3191da177e4SLinus Torvalds 3203b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3213b68aaeaSTrond Myklebust return; 322b185f835STrond Myklebust spin_lock(&inode->i_lock); 3233b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3241da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 325b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds static void 3291da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 3301da177e4SLinus Torvalds { 3311da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 3321da177e4SLinus Torvalds struct gss_cred, gc_base); 3331da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 334b185f835STrond Myklebust struct inode *inode = gss_msg->auth->dentry->d_inode; 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds if (gss_msg->ctx) 3371da177e4SLinus Torvalds gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); 3381da177e4SLinus Torvalds else 3391da177e4SLinus Torvalds task->tk_status = gss_msg->msg.errno; 340b185f835STrond Myklebust spin_lock(&inode->i_lock); 3411da177e4SLinus Torvalds gss_cred->gc_upcall = NULL; 3421da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 343b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3441da177e4SLinus Torvalds gss_release_msg(gss_msg); 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds static inline struct gss_upcall_msg * 3481da177e4SLinus Torvalds gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) 3491da177e4SLinus Torvalds { 3501da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 3511da177e4SLinus Torvalds 3520da974f4SPanagiotis Issaris gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); 3531da177e4SLinus Torvalds if (gss_msg != NULL) { 3541da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 3551da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 3561da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 3571da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 3581da177e4SLinus Torvalds gss_msg->msg.data = &gss_msg->uid; 3591da177e4SLinus Torvalds gss_msg->msg.len = sizeof(gss_msg->uid); 3601da177e4SLinus Torvalds gss_msg->uid = uid; 3611da177e4SLinus Torvalds gss_msg->auth = gss_auth; 3621da177e4SLinus Torvalds } 3631da177e4SLinus Torvalds return gss_msg; 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds static struct gss_upcall_msg * 3671da177e4SLinus Torvalds gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 3681da177e4SLinus Torvalds { 3691da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); 3721da177e4SLinus Torvalds if (gss_new == NULL) 3731da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 3741da177e4SLinus Torvalds gss_msg = gss_add_msg(gss_auth, gss_new); 3751da177e4SLinus Torvalds if (gss_msg == gss_new) { 3761da177e4SLinus Torvalds int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); 3771da177e4SLinus Torvalds if (res) { 3781da177e4SLinus Torvalds gss_unhash_msg(gss_new); 3791da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds } else 3821da177e4SLinus Torvalds gss_release_msg(gss_new); 3831da177e4SLinus Torvalds return gss_msg; 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds static inline int 3871da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 3881da177e4SLinus Torvalds { 3891da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 3904a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 3911da177e4SLinus Torvalds struct gss_auth, rpc_auth); 3921da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 3931da177e4SLinus Torvalds struct gss_cred, gc_base); 3941da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 395b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 3961da177e4SLinus Torvalds int err = 0; 3971da177e4SLinus Torvalds 3988885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 3998885cb36SChuck Lever cred->cr_uid); 4001da177e4SLinus Torvalds gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 4011da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4021da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4031da177e4SLinus Torvalds goto out; 4041da177e4SLinus Torvalds } 405b185f835STrond Myklebust spin_lock(&inode->i_lock); 4061da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 4071da177e4SLinus Torvalds rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); 4081da177e4SLinus Torvalds else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 4091da177e4SLinus Torvalds task->tk_timeout = 0; 4101da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 4111da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 4121da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 4131da177e4SLinus Torvalds rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); 4141da177e4SLinus Torvalds } else 4151da177e4SLinus Torvalds err = gss_msg->msg.errno; 416b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4171da177e4SLinus Torvalds gss_release_msg(gss_msg); 4181da177e4SLinus Torvalds out: 4198885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 4208885cb36SChuck Lever task->tk_pid, cred->cr_uid, err); 4211da177e4SLinus Torvalds return err; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds static inline int 4251da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 4261da177e4SLinus Torvalds { 427b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 4281da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 4291da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 4301da177e4SLinus Torvalds DEFINE_WAIT(wait); 4311da177e4SLinus Torvalds int err = 0; 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 4341da177e4SLinus Torvalds gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 4351da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4361da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4371da177e4SLinus Torvalds goto out; 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds for (;;) { 4401da177e4SLinus Torvalds prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 441b185f835STrond Myklebust spin_lock(&inode->i_lock); 4421da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 443b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4441da177e4SLinus Torvalds break; 4451da177e4SLinus Torvalds } 446b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4471da177e4SLinus Torvalds if (signalled()) { 4481da177e4SLinus Torvalds err = -ERESTARTSYS; 4491da177e4SLinus Torvalds goto out_intr; 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds schedule(); 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds if (gss_msg->ctx) 4541da177e4SLinus Torvalds gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); 4551da177e4SLinus Torvalds else 4561da177e4SLinus Torvalds err = gss_msg->msg.errno; 4571da177e4SLinus Torvalds out_intr: 4581da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 4591da177e4SLinus Torvalds gss_release_msg(gss_msg); 4601da177e4SLinus Torvalds out: 4618885cb36SChuck Lever dprintk("RPC: gss_create_upcall for uid %u result %d\n", 4628885cb36SChuck Lever cred->cr_uid, err); 4631da177e4SLinus Torvalds return err; 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds static ssize_t 4671da177e4SLinus Torvalds gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 4681da177e4SLinus Torvalds char __user *dst, size_t buflen) 4691da177e4SLinus Torvalds { 4701da177e4SLinus Torvalds char *data = (char *)msg->data + msg->copied; 4711da177e4SLinus Torvalds ssize_t mlen = msg->len; 4721da177e4SLinus Torvalds ssize_t left; 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds if (mlen > buflen) 4751da177e4SLinus Torvalds mlen = buflen; 4761da177e4SLinus Torvalds left = copy_to_user(dst, data, mlen); 4771da177e4SLinus Torvalds if (left < 0) { 4781da177e4SLinus Torvalds msg->errno = left; 4791da177e4SLinus Torvalds return left; 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds mlen -= left; 4821da177e4SLinus Torvalds msg->copied += mlen; 4831da177e4SLinus Torvalds msg->errno = 0; 4841da177e4SLinus Torvalds return mlen; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds static ssize_t 4901da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 4911da177e4SLinus Torvalds { 4921da177e4SLinus Torvalds const void *p, *end; 4931da177e4SLinus Torvalds void *buf; 4941da177e4SLinus Torvalds struct rpc_clnt *clnt; 4951da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 496b185f835STrond Myklebust struct inode *inode = filp->f_path.dentry->d_inode; 4971da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 4981da177e4SLinus Torvalds uid_t uid; 4993b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 5021da177e4SLinus Torvalds goto out; 5031da177e4SLinus Torvalds err = -ENOMEM; 5041da177e4SLinus Torvalds buf = kmalloc(mlen, GFP_KERNEL); 5051da177e4SLinus Torvalds if (!buf) 5061da177e4SLinus Torvalds goto out; 5071da177e4SLinus Torvalds 508b185f835STrond Myklebust clnt = RPC_I(inode)->private; 5091da177e4SLinus Torvalds err = -EFAULT; 5101da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 5111da177e4SLinus Torvalds goto err; 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 5141da177e4SLinus Torvalds p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 5151da177e4SLinus Torvalds if (IS_ERR(p)) { 5161da177e4SLinus Torvalds err = PTR_ERR(p); 5171da177e4SLinus Torvalds goto err; 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds err = -ENOMEM; 5211da177e4SLinus Torvalds ctx = gss_alloc_context(); 5221da177e4SLinus Torvalds if (ctx == NULL) 5231da177e4SLinus Torvalds goto err; 5243b68aaeaSTrond Myklebust 5253b68aaeaSTrond Myklebust err = -ENOENT; 5263b68aaeaSTrond Myklebust /* Find a matching upcall */ 5273b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5286e84c7b6STrond Myklebust gss_msg = __gss_find_upcall(RPC_I(inode), uid); 5293b68aaeaSTrond Myklebust if (gss_msg == NULL) { 5303b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5313b68aaeaSTrond Myklebust goto err_put_ctx; 5323b68aaeaSTrond Myklebust } 5333b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 5343b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5353b68aaeaSTrond Myklebust 5366e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 5371da177e4SLinus Torvalds if (IS_ERR(p)) { 5381da177e4SLinus Torvalds err = PTR_ERR(p); 5393b68aaeaSTrond Myklebust gss_msg->msg.errno = (err == -EACCES) ? -EACCES : -EAGAIN; 5403b68aaeaSTrond Myklebust goto err_release_msg; 5411da177e4SLinus Torvalds } 5421da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 5433b68aaeaSTrond Myklebust err = mlen; 5443b68aaeaSTrond Myklebust 5453b68aaeaSTrond Myklebust err_release_msg: 5463b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5471da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 548b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5491da177e4SLinus Torvalds gss_release_msg(gss_msg); 5501da177e4SLinus Torvalds err_put_ctx: 5511da177e4SLinus Torvalds gss_put_ctx(ctx); 5521da177e4SLinus Torvalds err: 5531da177e4SLinus Torvalds kfree(buf); 5541da177e4SLinus Torvalds out: 5553b68aaeaSTrond Myklebust dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 5561da177e4SLinus Torvalds return err; 5571da177e4SLinus Torvalds } 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds static void 5601da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 5611da177e4SLinus Torvalds { 5621da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 5631da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5641da177e4SLinus Torvalds 5656e84c7b6STrond Myklebust spin_lock(&inode->i_lock); 5666e84c7b6STrond Myklebust while (!list_empty(&rpci->in_downcall)) { 5676e84c7b6STrond Myklebust 5686e84c7b6STrond Myklebust gss_msg = list_entry(rpci->in_downcall.next, 5691da177e4SLinus Torvalds struct gss_upcall_msg, list); 5701da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 5711da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5721da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 573b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5741da177e4SLinus Torvalds gss_release_msg(gss_msg); 575b185f835STrond Myklebust spin_lock(&inode->i_lock); 5761da177e4SLinus Torvalds } 577b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds static void 5811da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 5821da177e4SLinus Torvalds { 5831da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 5841da177e4SLinus Torvalds static unsigned long ratelimit; 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds if (msg->errno < 0) { 5871da177e4SLinus Torvalds dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 5881da177e4SLinus Torvalds gss_msg); 5891da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5901da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 59148e49187STrond Myklebust if (msg->errno == -ETIMEDOUT) { 5921da177e4SLinus Torvalds unsigned long now = jiffies; 5931da177e4SLinus Torvalds if (time_after(now, ratelimit)) { 5941da177e4SLinus Torvalds printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 5951da177e4SLinus Torvalds "Please check user daemon is running!\n"); 5961da177e4SLinus Torvalds ratelimit = now + 15*HZ; 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds gss_release_msg(gss_msg); 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds /* 6041da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 6051da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 6061da177e4SLinus Torvalds */ 6071da177e4SLinus Torvalds static struct rpc_auth * 6081da177e4SLinus Torvalds gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 6091da177e4SLinus Torvalds { 6101da177e4SLinus Torvalds struct gss_auth *gss_auth; 6111da177e4SLinus Torvalds struct rpc_auth * auth; 6126a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 6176a19275aSJ. Bruce Fields return ERR_PTR(err); 6181da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 6191da177e4SLinus Torvalds goto out_dec; 6201da177e4SLinus Torvalds gss_auth->client = clnt; 6216a19275aSJ. Bruce Fields err = -EINVAL; 6221da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 6231da177e4SLinus Torvalds if (!gss_auth->mech) { 6241da177e4SLinus Torvalds printk(KERN_WARNING "%s: Pseudoflavor %d not found!", 6251da177e4SLinus Torvalds __FUNCTION__, flavor); 6261da177e4SLinus Torvalds goto err_free; 6271da177e4SLinus Torvalds } 6281da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 629438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 630438b6fdeSJ. Bruce Fields goto err_put_mech; 6311da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 6321da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 6331da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 6341da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 6351da177e4SLinus Torvalds auth->au_flavor = flavor; 6361da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 6371da177e4SLinus Torvalds 638158998b6STrond Myklebust gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, 639158998b6STrond Myklebust clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 6406a19275aSJ. Bruce Fields if (IS_ERR(gss_auth->dentry)) { 6416a19275aSJ. Bruce Fields err = PTR_ERR(gss_auth->dentry); 6421da177e4SLinus Torvalds goto err_put_mech; 6436a19275aSJ. Bruce Fields } 6441da177e4SLinus Torvalds 645f5c2187cSTrond Myklebust err = rpcauth_init_credcache(auth); 64607a2bf1dSTrond Myklebust if (err) 64707a2bf1dSTrond Myklebust goto err_unlink_pipe; 64807a2bf1dSTrond Myklebust 6491da177e4SLinus Torvalds return auth; 65007a2bf1dSTrond Myklebust err_unlink_pipe: 65107a2bf1dSTrond Myklebust rpc_unlink(gss_auth->dentry); 6521da177e4SLinus Torvalds err_put_mech: 6531da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 6541da177e4SLinus Torvalds err_free: 6551da177e4SLinus Torvalds kfree(gss_auth); 6561da177e4SLinus Torvalds out_dec: 6571da177e4SLinus Torvalds module_put(THIS_MODULE); 6586a19275aSJ. Bruce Fields return ERR_PTR(err); 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds static void 6621da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 6631da177e4SLinus Torvalds { 6641da177e4SLinus Torvalds struct gss_auth *gss_auth; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 6671da177e4SLinus Torvalds auth, auth->au_flavor); 6681da177e4SLinus Torvalds 6693ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 6703ab9bb72STrond Myklebust 6711da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 6725d67476fSTrond Myklebust rpc_unlink(gss_auth->dentry); 67312de3b35STrond Myklebust gss_auth->dentry = NULL; 6741da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds kfree(gss_auth); 6771da177e4SLinus Torvalds module_put(THIS_MODULE); 6781da177e4SLinus Torvalds } 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds /* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure 6811da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 6821da177e4SLinus Torvalds * allocated before freeing them. */ 6831da177e4SLinus Torvalds static void 6841da177e4SLinus Torvalds gss_destroy_ctx(struct gss_cl_ctx *ctx) 6851da177e4SLinus Torvalds { 6861da177e4SLinus Torvalds dprintk("RPC: gss_destroy_ctx\n"); 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds if (ctx->gc_gss_ctx) 6891da177e4SLinus Torvalds gss_delete_sec_context(&ctx->gc_gss_ctx); 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 6921da177e4SLinus Torvalds kfree(ctx); 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds static void 69631be5bf1STrond Myklebust gss_free_cred(struct gss_cred *gss_cred) 6971da177e4SLinus Torvalds { 69831be5bf1STrond Myklebust dprintk("RPC: gss_free_cred %p\n", gss_cred); 69931be5bf1STrond Myklebust if (gss_cred->gc_ctx) 70031be5bf1STrond Myklebust gss_put_ctx(gss_cred->gc_ctx); 70131be5bf1STrond Myklebust kfree(gss_cred); 70231be5bf1STrond Myklebust } 7031da177e4SLinus Torvalds 70431be5bf1STrond Myklebust static void 70531be5bf1STrond Myklebust gss_free_cred_callback(struct rcu_head *head) 70631be5bf1STrond Myklebust { 70731be5bf1STrond Myklebust struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 70831be5bf1STrond Myklebust gss_free_cred(gss_cred); 70931be5bf1STrond Myklebust } 7101da177e4SLinus Torvalds 71131be5bf1STrond Myklebust static void 71231be5bf1STrond Myklebust gss_destroy_cred(struct rpc_cred *cred) 71331be5bf1STrond Myklebust { 71431be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, gss_free_cred_callback); 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds /* 7181da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 7191da177e4SLinus Torvalds */ 7201da177e4SLinus Torvalds static struct rpc_cred * 7218a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7221da177e4SLinus Torvalds { 7238a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds static struct rpc_cred * 7278a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7281da177e4SLinus Torvalds { 7291da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 7301da177e4SLinus Torvalds struct gss_cred *cred = NULL; 7311da177e4SLinus Torvalds int err = -ENOMEM; 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 7341da177e4SLinus Torvalds acred->uid, auth->au_flavor); 7351da177e4SLinus Torvalds 7360da974f4SPanagiotis Issaris if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL))) 7371da177e4SLinus Torvalds goto out_err; 7381da177e4SLinus Torvalds 7395fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 7401da177e4SLinus Torvalds /* 7411da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 7421da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 7431da177e4SLinus Torvalds */ 744fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 7451da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 7461da177e4SLinus Torvalds return &cred->gc_base; 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds out_err: 7491da177e4SLinus Torvalds dprintk("RPC: gss_create_cred failed with error %d\n", err); 7501da177e4SLinus Torvalds return ERR_PTR(err); 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds static int 754fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 755fba3bad4STrond Myklebust { 756fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 757fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 758fba3bad4STrond Myklebust int err; 759fba3bad4STrond Myklebust 760fba3bad4STrond Myklebust do { 761fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 762fba3bad4STrond Myklebust } while (err == -EAGAIN); 763fba3bad4STrond Myklebust return err; 764fba3bad4STrond Myklebust } 765fba3bad4STrond Myklebust 766fba3bad4STrond Myklebust static int 7678a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 7681da177e4SLinus Torvalds { 7691da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 7701da177e4SLinus Torvalds 7718a317760STrond Myklebust /* 7728a317760STrond Myklebust * If the searchflags have set RPCAUTH_LOOKUP_NEW, then 7738a317760STrond Myklebust * we don't really care if the credential has expired or not, 7748a317760STrond Myklebust * since the caller should be prepared to reinitialise it. 7758a317760STrond Myklebust */ 776fc432dd9STrond Myklebust if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 7778a317760STrond Myklebust goto out; 7781da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 7791da177e4SLinus Torvalds if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 7801da177e4SLinus Torvalds return 0; 7818a317760STrond Myklebust out: 7821da177e4SLinus Torvalds return (rc->cr_uid == acred->uid); 7831da177e4SLinus Torvalds } 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds /* 7861da177e4SLinus Torvalds * Marshal credentials. 7871da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 7881da177e4SLinus Torvalds */ 789d8ed029dSAlexey Dobriyan static __be32 * 790d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 7911da177e4SLinus Torvalds { 7921da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 7931da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 7941da177e4SLinus Torvalds gc_base); 7951da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 796d8ed029dSAlexey Dobriyan __be32 *cred_len; 7971da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 7981da177e4SLinus Torvalds u32 maj_stat = 0; 7991da177e4SLinus Torvalds struct xdr_netobj mic; 8001da177e4SLinus Torvalds struct kvec iov; 8011da177e4SLinus Torvalds struct xdr_buf verf_buf; 8021da177e4SLinus Torvalds 8038885cb36SChuck Lever dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8061da177e4SLinus Torvalds cred_len = p++; 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 8091da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 8101da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 8131da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 8141da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 8151da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 8161da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 8171da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 8181da177e4SLinus Torvalds 8191da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 8201da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 821808012fbSChuck Lever iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 822808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 8231da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 8241da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds /* set verifier flavor*/ 8271da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 83000fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 8311da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 832fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 8331da177e4SLinus Torvalds } else if (maj_stat != 0) { 8341da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 8351da177e4SLinus Torvalds goto out_put_ctx; 8361da177e4SLinus Torvalds } 8371da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 8381da177e4SLinus Torvalds gss_put_ctx(ctx); 8391da177e4SLinus Torvalds return p; 8401da177e4SLinus Torvalds out_put_ctx: 8411da177e4SLinus Torvalds gss_put_ctx(ctx); 8421da177e4SLinus Torvalds return NULL; 8431da177e4SLinus Torvalds } 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds /* 8461da177e4SLinus Torvalds * Refresh credentials. XXX - finish 8471da177e4SLinus Torvalds */ 8481da177e4SLinus Torvalds static int 8491da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 8501da177e4SLinus Torvalds { 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) 8531da177e4SLinus Torvalds return gss_refresh_upcall(task); 8541da177e4SLinus Torvalds return 0; 8551da177e4SLinus Torvalds } 8561da177e4SLinus Torvalds 857d8ed029dSAlexey Dobriyan static __be32 * 858d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 8591da177e4SLinus Torvalds { 8601da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 8611da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 862d8ed029dSAlexey Dobriyan __be32 seq; 8631da177e4SLinus Torvalds struct kvec iov; 8641da177e4SLinus Torvalds struct xdr_buf verf_buf; 8651da177e4SLinus Torvalds struct xdr_netobj mic; 8661da177e4SLinus Torvalds u32 flav,len; 8671da177e4SLinus Torvalds u32 maj_stat; 8681da177e4SLinus Torvalds 8698885cb36SChuck Lever dprintk("RPC: %5u gss_validate\n", task->tk_pid); 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds flav = ntohl(*p++); 8721da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 8731da177e4SLinus Torvalds goto out_bad; 8741da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 8751da177e4SLinus Torvalds goto out_bad; 8761da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 8771da177e4SLinus Torvalds iov.iov_base = &seq; 8781da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 8791da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 8801da177e4SLinus Torvalds mic.data = (u8 *)p; 8811da177e4SLinus Torvalds mic.len = len; 8821da177e4SLinus Torvalds 88300fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 8841da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 885fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 8861da177e4SLinus Torvalds if (maj_stat) 8871da177e4SLinus Torvalds goto out_bad; 88824b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 88924b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 89024b2605bSJ. Bruce Fields task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2; 8911da177e4SLinus Torvalds gss_put_ctx(ctx); 8928885cb36SChuck Lever dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 8931da177e4SLinus Torvalds task->tk_pid); 8941da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 8951da177e4SLinus Torvalds out_bad: 8961da177e4SLinus Torvalds gss_put_ctx(ctx); 8978885cb36SChuck Lever dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 8981da177e4SLinus Torvalds return NULL; 8991da177e4SLinus Torvalds } 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds static inline int 9021da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 903d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 9041da177e4SLinus Torvalds { 9051da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 9061da177e4SLinus Torvalds struct xdr_buf integ_buf; 907d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 9081da177e4SLinus Torvalds struct xdr_netobj mic; 909d8ed029dSAlexey Dobriyan u32 offset; 910d8ed029dSAlexey Dobriyan __be32 *q; 9111da177e4SLinus Torvalds struct kvec *iov; 9121da177e4SLinus Torvalds u32 maj_stat = 0; 9131da177e4SLinus Torvalds int status = -EIO; 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds integ_len = p++; 9161da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 9171da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds status = encode(rqstp, p, obj); 9201da177e4SLinus Torvalds if (status) 9211da177e4SLinus Torvalds return status; 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 9241da177e4SLinus Torvalds offset, snd_buf->len - offset)) 9251da177e4SLinus Torvalds return status; 9261da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 9291da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 9301da177e4SLinus Torvalds iov = snd_buf->tail; 9311da177e4SLinus Torvalds else 9321da177e4SLinus Torvalds iov = snd_buf->head; 9331da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 9341da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 9351da177e4SLinus Torvalds 93600fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 9371da177e4SLinus Torvalds status = -EIO; /* XXX? */ 9381da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 939fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 9401da177e4SLinus Torvalds else if (maj_stat) 9411da177e4SLinus Torvalds return status; 9421da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 9451da177e4SLinus Torvalds iov->iov_len += offset; 9461da177e4SLinus Torvalds snd_buf->len += offset; 9471da177e4SLinus Torvalds return 0; 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds 9502d2da60cSJ. Bruce Fields static void 9512d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 9522d2da60cSJ. Bruce Fields { 9532d2da60cSJ. Bruce Fields int i; 9542d2da60cSJ. Bruce Fields 9552d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 9562d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 9572d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 9582d2da60cSJ. Bruce Fields } 9592d2da60cSJ. Bruce Fields 9602d2da60cSJ. Bruce Fields static int 9612d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 9622d2da60cSJ. Bruce Fields { 9632d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 9642d2da60cSJ. Bruce Fields int first, last, i; 9652d2da60cSJ. Bruce Fields 9662d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 9672d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 9682d2da60cSJ. Bruce Fields return 0; 9692d2da60cSJ. Bruce Fields } 9702d2da60cSJ. Bruce Fields 9712d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 9722d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 9732d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 9742d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 9752d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 9762d2da60cSJ. Bruce Fields GFP_NOFS); 9772d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 9782d2da60cSJ. Bruce Fields goto out; 9792d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 9802d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 9812d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 9822d2da60cSJ. Bruce Fields goto out_free; 9832d2da60cSJ. Bruce Fields } 9842d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 9852d2da60cSJ. Bruce Fields return 0; 9862d2da60cSJ. Bruce Fields out_free: 9872d2da60cSJ. Bruce Fields for (i--; i >= 0; i--) { 9882d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 9892d2da60cSJ. Bruce Fields } 9902d2da60cSJ. Bruce Fields out: 9912d2da60cSJ. Bruce Fields return -EAGAIN; 9922d2da60cSJ. Bruce Fields } 9932d2da60cSJ. Bruce Fields 9942d2da60cSJ. Bruce Fields static inline int 9952d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 996d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 9972d2da60cSJ. Bruce Fields { 9982d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 9992d2da60cSJ. Bruce Fields u32 offset; 10002d2da60cSJ. Bruce Fields u32 maj_stat; 10012d2da60cSJ. Bruce Fields int status; 1002d8ed029dSAlexey Dobriyan __be32 *opaque_len; 10032d2da60cSJ. Bruce Fields struct page **inpages; 10042d2da60cSJ. Bruce Fields int first; 10052d2da60cSJ. Bruce Fields int pad; 10062d2da60cSJ. Bruce Fields struct kvec *iov; 10072d2da60cSJ. Bruce Fields char *tmp; 10082d2da60cSJ. Bruce Fields 10092d2da60cSJ. Bruce Fields opaque_len = p++; 10102d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 10112d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 10122d2da60cSJ. Bruce Fields 10132d2da60cSJ. Bruce Fields status = encode(rqstp, p, obj); 10142d2da60cSJ. Bruce Fields if (status) 10152d2da60cSJ. Bruce Fields return status; 10162d2da60cSJ. Bruce Fields 10172d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 10182d2da60cSJ. Bruce Fields if (status) 10192d2da60cSJ. Bruce Fields return status; 10202d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 10212d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 10222d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 10232d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 10242d2da60cSJ. Bruce Fields /* Give the tail its own page, in case we need extra space in the 10252d2da60cSJ. Bruce Fields * head when wrapping: */ 10262d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 10272d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 10282d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 10292d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 10302d2da60cSJ. Bruce Fields } 103100fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 10322d2da60cSJ. Bruce Fields /* RPC_SLACK_SPACE should prevent this ever happening: */ 10332d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 10342d2da60cSJ. Bruce Fields status = -EIO; 10352d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 10362d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 10372d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1038fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 10392d2da60cSJ. Bruce Fields else if (maj_stat) 10402d2da60cSJ. Bruce Fields return status; 10412d2da60cSJ. Bruce Fields 10422d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 10432d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 10442d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 10452d2da60cSJ. Bruce Fields iov = snd_buf->tail; 10462d2da60cSJ. Bruce Fields else 10472d2da60cSJ. Bruce Fields iov = snd_buf->head; 10482d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 10492d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 10502d2da60cSJ. Bruce Fields memset(p, 0, pad); 10512d2da60cSJ. Bruce Fields iov->iov_len += pad; 10522d2da60cSJ. Bruce Fields snd_buf->len += pad; 10532d2da60cSJ. Bruce Fields 10542d2da60cSJ. Bruce Fields return 0; 10552d2da60cSJ. Bruce Fields } 10562d2da60cSJ. Bruce Fields 10571da177e4SLinus Torvalds static int 10581da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 1059d8ed029dSAlexey Dobriyan kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 10601da177e4SLinus Torvalds { 10611da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 10621da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 10631da177e4SLinus Torvalds gc_base); 10641da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 10651da177e4SLinus Torvalds int status = -EIO; 10661da177e4SLinus Torvalds 10678885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 10681da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 10691da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 10701da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 10711da177e4SLinus Torvalds */ 10721da177e4SLinus Torvalds status = encode(rqstp, p, obj); 10731da177e4SLinus Torvalds goto out; 10741da177e4SLinus Torvalds } 10751da177e4SLinus Torvalds switch (gss_cred->gc_service) { 10761da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 10771da177e4SLinus Torvalds status = encode(rqstp, p, obj); 10781da177e4SLinus Torvalds break; 10791da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 10801da177e4SLinus Torvalds status = gss_wrap_req_integ(cred, ctx, encode, 10811da177e4SLinus Torvalds rqstp, p, obj); 10821da177e4SLinus Torvalds break; 10831da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 10842d2da60cSJ. Bruce Fields status = gss_wrap_req_priv(cred, ctx, encode, 10852d2da60cSJ. Bruce Fields rqstp, p, obj); 10861da177e4SLinus Torvalds break; 10871da177e4SLinus Torvalds } 10881da177e4SLinus Torvalds out: 10891da177e4SLinus Torvalds gss_put_ctx(ctx); 10908885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 10911da177e4SLinus Torvalds return status; 10921da177e4SLinus Torvalds } 10931da177e4SLinus Torvalds 10941da177e4SLinus Torvalds static inline int 10951da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1096d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 10971da177e4SLinus Torvalds { 10981da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 10991da177e4SLinus Torvalds struct xdr_buf integ_buf; 11001da177e4SLinus Torvalds struct xdr_netobj mic; 11011da177e4SLinus Torvalds u32 data_offset, mic_offset; 11021da177e4SLinus Torvalds u32 integ_len; 11031da177e4SLinus Torvalds u32 maj_stat; 11041da177e4SLinus Torvalds int status = -EIO; 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 11071da177e4SLinus Torvalds if (integ_len & 3) 11081da177e4SLinus Torvalds return status; 11091da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 11101da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 11111da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 11121da177e4SLinus Torvalds return status; 11131da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 11141da177e4SLinus Torvalds return status; 11151da177e4SLinus Torvalds 11161da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 11171da177e4SLinus Torvalds mic_offset - data_offset)) 11181da177e4SLinus Torvalds return status; 11191da177e4SLinus Torvalds 11201da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 11211da177e4SLinus Torvalds return status; 11221da177e4SLinus Torvalds 112300fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 11241da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1125fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11261da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 11271da177e4SLinus Torvalds return status; 11281da177e4SLinus Torvalds return 0; 11291da177e4SLinus Torvalds } 11301da177e4SLinus Torvalds 11312d2da60cSJ. Bruce Fields static inline int 11322d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1133d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 11342d2da60cSJ. Bruce Fields { 11352d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 11362d2da60cSJ. Bruce Fields u32 offset; 11372d2da60cSJ. Bruce Fields u32 opaque_len; 11382d2da60cSJ. Bruce Fields u32 maj_stat; 11392d2da60cSJ. Bruce Fields int status = -EIO; 11402d2da60cSJ. Bruce Fields 11412d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 11422d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 11432d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 11442d2da60cSJ. Bruce Fields return status; 11452d2da60cSJ. Bruce Fields /* remove padding: */ 11462d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 11472d2da60cSJ. Bruce Fields 114800fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 11492d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1150fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11512d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 11522d2da60cSJ. Bruce Fields return status; 11532d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 11542d2da60cSJ. Bruce Fields return status; 11552d2da60cSJ. Bruce Fields 11562d2da60cSJ. Bruce Fields return 0; 11572d2da60cSJ. Bruce Fields } 11582d2da60cSJ. Bruce Fields 11592d2da60cSJ. Bruce Fields 11601da177e4SLinus Torvalds static int 11611da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1162d8ed029dSAlexey Dobriyan kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 11631da177e4SLinus Torvalds { 11641da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 11651da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 11661da177e4SLinus Torvalds gc_base); 11671da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1168d8ed029dSAlexey Dobriyan __be32 *savedp = p; 11692d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 11702d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 11711da177e4SLinus Torvalds int status = -EIO; 11721da177e4SLinus Torvalds 11731da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 11741da177e4SLinus Torvalds goto out_decode; 11751da177e4SLinus Torvalds switch (gss_cred->gc_service) { 11761da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 11771da177e4SLinus Torvalds break; 11781da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 11791da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 11801da177e4SLinus Torvalds if (status) 11811da177e4SLinus Torvalds goto out; 11821da177e4SLinus Torvalds break; 11831da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 11842d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 11852d2da60cSJ. Bruce Fields if (status) 11862d2da60cSJ. Bruce Fields goto out; 11871da177e4SLinus Torvalds break; 11881da177e4SLinus Torvalds } 118924b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 11902d2da60cSJ. Bruce Fields task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp) 11912d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 11921da177e4SLinus Torvalds out_decode: 11931da177e4SLinus Torvalds status = decode(rqstp, p, obj); 11941da177e4SLinus Torvalds out: 11951da177e4SLinus Torvalds gss_put_ctx(ctx); 11968885cb36SChuck Lever dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 11971da177e4SLinus Torvalds status); 11981da177e4SLinus Torvalds return status; 11991da177e4SLinus Torvalds } 12001da177e4SLinus Torvalds 1201f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 12021da177e4SLinus Torvalds .owner = THIS_MODULE, 12031da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 12041da177e4SLinus Torvalds #ifdef RPC_DEBUG 12051da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 12061da177e4SLinus Torvalds #endif 12071da177e4SLinus Torvalds .create = gss_create, 12081da177e4SLinus Torvalds .destroy = gss_destroy, 12091da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 12101da177e4SLinus Torvalds .crcreate = gss_create_cred 12111da177e4SLinus Torvalds }; 12121da177e4SLinus Torvalds 1213f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 12141da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 12151da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1216fba3bad4STrond Myklebust .cr_init = gss_cred_init, 12171da177e4SLinus Torvalds .crmatch = gss_match, 12181da177e4SLinus Torvalds .crmarshal = gss_marshal, 12191da177e4SLinus Torvalds .crrefresh = gss_refresh, 12201da177e4SLinus Torvalds .crvalidate = gss_validate, 12211da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 12221da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 12231da177e4SLinus Torvalds }; 12241da177e4SLinus Torvalds 12251da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops = { 12261da177e4SLinus Torvalds .upcall = gss_pipe_upcall, 12271da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 12281da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 12291da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 12301da177e4SLinus Torvalds }; 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds /* 12331da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 12341da177e4SLinus Torvalds */ 12351da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 12361da177e4SLinus Torvalds { 12371da177e4SLinus Torvalds int err = 0; 12381da177e4SLinus Torvalds 12391da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 12401da177e4SLinus Torvalds if (err) 12411da177e4SLinus Torvalds goto out; 12421da177e4SLinus Torvalds err = gss_svc_init(); 12431da177e4SLinus Torvalds if (err) 12441da177e4SLinus Torvalds goto out_unregister; 12451da177e4SLinus Torvalds return 0; 12461da177e4SLinus Torvalds out_unregister: 12471da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 12481da177e4SLinus Torvalds out: 12491da177e4SLinus Torvalds return err; 12501da177e4SLinus Torvalds } 12511da177e4SLinus Torvalds 12521da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 12531da177e4SLinus Torvalds { 12541da177e4SLinus Torvalds gss_svc_shutdown(); 12551da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 12561da177e4SLinus Torvalds } 12571da177e4SLinus Torvalds 12581da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 12591da177e4SLinus Torvalds module_init(init_rpcsec_gss) 12601da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1261