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_EXPIRE (60 * HZ) /* XXX: reasonable? */ 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 static DEFINE_RWLOCK(gss_ctx_lock); 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds struct gss_auth { 851da177e4SLinus Torvalds struct rpc_auth rpc_auth; 861da177e4SLinus Torvalds struct gss_api_mech *mech; 871da177e4SLinus Torvalds enum rpc_gss_svc service; 881da177e4SLinus Torvalds struct rpc_clnt *client; 891da177e4SLinus Torvalds struct dentry *dentry; 901da177e4SLinus Torvalds }; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds static void gss_destroy_ctx(struct gss_cl_ctx *); 931da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops; 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds static inline struct gss_cl_ctx * 961da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 971da177e4SLinus Torvalds { 981da177e4SLinus Torvalds atomic_inc(&ctx->count); 991da177e4SLinus Torvalds return ctx; 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds static inline void 1031da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1061da177e4SLinus Torvalds gss_destroy_ctx(ctx); 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds static void 1101da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1111da177e4SLinus Torvalds { 1121da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1131da177e4SLinus Torvalds struct gss_cl_ctx *old; 1141da177e4SLinus Torvalds write_lock(&gss_ctx_lock); 1151da177e4SLinus Torvalds old = gss_cred->gc_ctx; 1161da177e4SLinus Torvalds gss_cred->gc_ctx = ctx; 117fc432dd9STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 118fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 1191da177e4SLinus Torvalds write_unlock(&gss_ctx_lock); 1201da177e4SLinus Torvalds if (old) 1211da177e4SLinus Torvalds gss_put_ctx(old); 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds static int 1251da177e4SLinus Torvalds gss_cred_is_uptodate_ctx(struct rpc_cred *cred) 1261da177e4SLinus Torvalds { 1271da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1281da177e4SLinus Torvalds int res = 0; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds read_lock(&gss_ctx_lock); 131fc432dd9STrond Myklebust if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx) 1321da177e4SLinus Torvalds res = 1; 1331da177e4SLinus Torvalds read_unlock(&gss_ctx_lock); 1341da177e4SLinus Torvalds return res; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds static const void * 1381da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1391da177e4SLinus Torvalds { 1401da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1411da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1421da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1431da177e4SLinus Torvalds memcpy(res, p, len); 1441da177e4SLinus Torvalds return q; 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds static inline const void * 1481da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1491da177e4SLinus Torvalds { 1501da177e4SLinus Torvalds const void *q; 1511da177e4SLinus Torvalds unsigned int len; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1541da177e4SLinus Torvalds if (IS_ERR(p)) 1551da177e4SLinus Torvalds return p; 1561da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 1571da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1581da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 159e69062b4SArnaldo Carvalho de Melo dest->data = kmemdup(p, len, GFP_KERNEL); 1601da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 1611da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1621da177e4SLinus Torvalds dest->len = len; 1631da177e4SLinus Torvalds return q; 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds static struct gss_cl_ctx * 1671da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 1681da177e4SLinus Torvalds { 1691da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1701da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds read_lock(&gss_ctx_lock); 1731da177e4SLinus Torvalds if (gss_cred->gc_ctx) 1741da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 1751da177e4SLinus Torvalds read_unlock(&gss_ctx_lock); 1761da177e4SLinus Torvalds return ctx; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds static struct gss_cl_ctx * 1801da177e4SLinus Torvalds gss_alloc_context(void) 1811da177e4SLinus Torvalds { 1821da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 1831da177e4SLinus Torvalds 1840da974f4SPanagiotis Issaris ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 1851da177e4SLinus Torvalds if (ctx != NULL) { 1861da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 1871da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 1881da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 1891da177e4SLinus Torvalds atomic_set(&ctx->count,1); 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds return ctx; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 1951da177e4SLinus Torvalds static const void * 1961da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 1971da177e4SLinus Torvalds { 1981da177e4SLinus Torvalds const void *q; 1991da177e4SLinus Torvalds unsigned int seclen; 2001da177e4SLinus Torvalds unsigned int timeout; 2011da177e4SLinus Torvalds u32 window_size; 2021da177e4SLinus Torvalds int ret; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds /* First unsigned int gives the lifetime (in seconds) of the cred */ 2051da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2061da177e4SLinus Torvalds if (IS_ERR(p)) 2071da177e4SLinus Torvalds goto err; 2081da177e4SLinus Torvalds if (timeout == 0) 2091da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 2101da177e4SLinus Torvalds ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 2111da177e4SLinus Torvalds /* Sequence number window. Determines the maximum number of simultaneous requests */ 2121da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2131da177e4SLinus Torvalds if (IS_ERR(p)) 2141da177e4SLinus Torvalds goto err; 2151da177e4SLinus Torvalds ctx->gc_win = window_size; 2161da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2171da177e4SLinus Torvalds if (ctx->gc_win == 0) { 2181da177e4SLinus Torvalds /* in which case, p points to an error code which we ignore */ 2191da177e4SLinus Torvalds p = ERR_PTR(-EACCES); 2201da177e4SLinus Torvalds goto err; 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds /* copy the opaque wire context */ 2231da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2241da177e4SLinus Torvalds if (IS_ERR(p)) 2251da177e4SLinus Torvalds goto err; 2261da177e4SLinus Torvalds /* import the opaque security context */ 2271da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2281da177e4SLinus Torvalds if (IS_ERR(p)) 2291da177e4SLinus Torvalds goto err; 2301da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2311da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2321da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2331da177e4SLinus Torvalds goto err; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 2361da177e4SLinus Torvalds if (ret < 0) { 2371da177e4SLinus Torvalds p = ERR_PTR(ret); 2381da177e4SLinus Torvalds goto err; 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds return q; 2411da177e4SLinus Torvalds err: 2421da177e4SLinus Torvalds dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 2431da177e4SLinus Torvalds return p; 2441da177e4SLinus Torvalds } 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds struct gss_upcall_msg { 2481da177e4SLinus Torvalds atomic_t count; 2491da177e4SLinus Torvalds uid_t uid; 2501da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2511da177e4SLinus Torvalds struct list_head list; 2521da177e4SLinus Torvalds struct gss_auth *auth; 2531da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2541da177e4SLinus Torvalds wait_queue_head_t waitqueue; 2551da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 2561da177e4SLinus Torvalds }; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds static void 2591da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 2601da177e4SLinus Torvalds { 2611da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 2621da177e4SLinus Torvalds return; 2631da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 2641da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 2651da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 2661da177e4SLinus Torvalds kfree(gss_msg); 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds static struct gss_upcall_msg * 2706e84c7b6STrond Myklebust __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 2711da177e4SLinus Torvalds { 2721da177e4SLinus Torvalds struct gss_upcall_msg *pos; 2736e84c7b6STrond Myklebust list_for_each_entry(pos, &rpci->in_downcall, list) { 2741da177e4SLinus Torvalds if (pos->uid != uid) 2751da177e4SLinus Torvalds continue; 2761da177e4SLinus Torvalds atomic_inc(&pos->count); 2771da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found msg %p\n", pos); 2781da177e4SLinus Torvalds return pos; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found nothing\n"); 2811da177e4SLinus Torvalds return NULL; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds /* Try to add a upcall to the pipefs queue. 2851da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 2861da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 2871da177e4SLinus Torvalds */ 2881da177e4SLinus Torvalds static inline struct gss_upcall_msg * 2891da177e4SLinus Torvalds gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) 2901da177e4SLinus Torvalds { 291b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 2926e84c7b6STrond Myklebust struct rpc_inode *rpci = RPC_I(inode); 2931da177e4SLinus Torvalds struct gss_upcall_msg *old; 2941da177e4SLinus Torvalds 295b185f835STrond Myklebust spin_lock(&inode->i_lock); 2966e84c7b6STrond Myklebust old = __gss_find_upcall(rpci, gss_msg->uid); 2971da177e4SLinus Torvalds if (old == NULL) { 2981da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 2996e84c7b6STrond Myklebust list_add(&gss_msg->list, &rpci->in_downcall); 3001da177e4SLinus Torvalds } else 3011da177e4SLinus Torvalds gss_msg = old; 302b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3031da177e4SLinus Torvalds return gss_msg; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds static void 3071da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3081da177e4SLinus Torvalds { 3091da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3101da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3111da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3121da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds static void 3161da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3171da177e4SLinus Torvalds { 3181da177e4SLinus Torvalds struct gss_auth *gss_auth = gss_msg->auth; 319b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 3201da177e4SLinus Torvalds 3213b68aaeaSTrond Myklebust if (list_empty(&gss_msg->list)) 3223b68aaeaSTrond Myklebust return; 323b185f835STrond Myklebust spin_lock(&inode->i_lock); 3243b68aaeaSTrond Myklebust if (!list_empty(&gss_msg->list)) 3251da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 326b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds static void 3301da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 3311da177e4SLinus Torvalds { 3321da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 3331da177e4SLinus Torvalds struct gss_cred, gc_base); 3341da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 335b185f835STrond Myklebust struct inode *inode = gss_msg->auth->dentry->d_inode; 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds if (gss_msg->ctx) 3381da177e4SLinus Torvalds gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); 3391da177e4SLinus Torvalds else 3401da177e4SLinus Torvalds task->tk_status = gss_msg->msg.errno; 341b185f835STrond Myklebust spin_lock(&inode->i_lock); 3421da177e4SLinus Torvalds gss_cred->gc_upcall = NULL; 3431da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 344b185f835STrond Myklebust spin_unlock(&inode->i_lock); 3451da177e4SLinus Torvalds gss_release_msg(gss_msg); 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds static inline struct gss_upcall_msg * 3491da177e4SLinus Torvalds gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) 3501da177e4SLinus Torvalds { 3511da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 3521da177e4SLinus Torvalds 3530da974f4SPanagiotis Issaris gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); 3541da177e4SLinus Torvalds if (gss_msg != NULL) { 3551da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 3561da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 3571da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 3581da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 3591da177e4SLinus Torvalds gss_msg->msg.data = &gss_msg->uid; 3601da177e4SLinus Torvalds gss_msg->msg.len = sizeof(gss_msg->uid); 3611da177e4SLinus Torvalds gss_msg->uid = uid; 3621da177e4SLinus Torvalds gss_msg->auth = gss_auth; 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds return gss_msg; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds static struct gss_upcall_msg * 3681da177e4SLinus Torvalds gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 3691da177e4SLinus Torvalds { 3701da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); 3731da177e4SLinus Torvalds if (gss_new == NULL) 3741da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 3751da177e4SLinus Torvalds gss_msg = gss_add_msg(gss_auth, gss_new); 3761da177e4SLinus Torvalds if (gss_msg == gss_new) { 3771da177e4SLinus Torvalds int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); 3781da177e4SLinus Torvalds if (res) { 3791da177e4SLinus Torvalds gss_unhash_msg(gss_new); 3801da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds } else 3831da177e4SLinus Torvalds gss_release_msg(gss_new); 3841da177e4SLinus Torvalds return gss_msg; 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds static inline int 3881da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 3891da177e4SLinus Torvalds { 3901da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 3914a8c1344STrond Myklebust struct gss_auth *gss_auth = container_of(cred->cr_auth, 3921da177e4SLinus Torvalds struct gss_auth, rpc_auth); 3931da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 3941da177e4SLinus Torvalds struct gss_cred, gc_base); 3951da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 396b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 3971da177e4SLinus Torvalds int err = 0; 3981da177e4SLinus Torvalds 3998885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 4008885cb36SChuck Lever cred->cr_uid); 4011da177e4SLinus Torvalds gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 4021da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4031da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4041da177e4SLinus Torvalds goto out; 4051da177e4SLinus Torvalds } 406b185f835STrond Myklebust spin_lock(&inode->i_lock); 4071da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 4081da177e4SLinus Torvalds rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); 4091da177e4SLinus Torvalds else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 4101da177e4SLinus Torvalds task->tk_timeout = 0; 4111da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 4121da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 4131da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 4141da177e4SLinus Torvalds rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); 4151da177e4SLinus Torvalds } else 4161da177e4SLinus Torvalds err = gss_msg->msg.errno; 417b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4181da177e4SLinus Torvalds gss_release_msg(gss_msg); 4191da177e4SLinus Torvalds out: 4208885cb36SChuck Lever dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 4218885cb36SChuck Lever task->tk_pid, cred->cr_uid, err); 4221da177e4SLinus Torvalds return err; 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds static inline int 4261da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 4271da177e4SLinus Torvalds { 428b185f835STrond Myklebust struct inode *inode = gss_auth->dentry->d_inode; 4291da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 4301da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 4311da177e4SLinus Torvalds DEFINE_WAIT(wait); 4321da177e4SLinus Torvalds int err = 0; 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 4351da177e4SLinus Torvalds gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 4361da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4371da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4381da177e4SLinus Torvalds goto out; 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds for (;;) { 4411da177e4SLinus Torvalds prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 442b185f835STrond Myklebust spin_lock(&inode->i_lock); 4431da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 444b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4451da177e4SLinus Torvalds break; 4461da177e4SLinus Torvalds } 447b185f835STrond Myklebust spin_unlock(&inode->i_lock); 4481da177e4SLinus Torvalds if (signalled()) { 4491da177e4SLinus Torvalds err = -ERESTARTSYS; 4501da177e4SLinus Torvalds goto out_intr; 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds schedule(); 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds if (gss_msg->ctx) 4551da177e4SLinus Torvalds gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); 4561da177e4SLinus Torvalds else 4571da177e4SLinus Torvalds err = gss_msg->msg.errno; 4581da177e4SLinus Torvalds out_intr: 4591da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 4601da177e4SLinus Torvalds gss_release_msg(gss_msg); 4611da177e4SLinus Torvalds out: 4628885cb36SChuck Lever dprintk("RPC: gss_create_upcall for uid %u result %d\n", 4638885cb36SChuck Lever cred->cr_uid, err); 4641da177e4SLinus Torvalds return err; 4651da177e4SLinus Torvalds } 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds static ssize_t 4681da177e4SLinus Torvalds gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 4691da177e4SLinus Torvalds char __user *dst, size_t buflen) 4701da177e4SLinus Torvalds { 4711da177e4SLinus Torvalds char *data = (char *)msg->data + msg->copied; 4721da177e4SLinus Torvalds ssize_t mlen = msg->len; 4731da177e4SLinus Torvalds ssize_t left; 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds if (mlen > buflen) 4761da177e4SLinus Torvalds mlen = buflen; 4771da177e4SLinus Torvalds left = copy_to_user(dst, data, mlen); 4781da177e4SLinus Torvalds if (left < 0) { 4791da177e4SLinus Torvalds msg->errno = left; 4801da177e4SLinus Torvalds return left; 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds mlen -= left; 4831da177e4SLinus Torvalds msg->copied += mlen; 4841da177e4SLinus Torvalds msg->errno = 0; 4851da177e4SLinus Torvalds return mlen; 4861da177e4SLinus Torvalds } 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds static ssize_t 4911da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 4921da177e4SLinus Torvalds { 4931da177e4SLinus Torvalds const void *p, *end; 4941da177e4SLinus Torvalds void *buf; 4951da177e4SLinus Torvalds struct rpc_clnt *clnt; 4961da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 497b185f835STrond Myklebust struct inode *inode = filp->f_path.dentry->d_inode; 4981da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 4991da177e4SLinus Torvalds uid_t uid; 5003b68aaeaSTrond Myklebust ssize_t err = -EFBIG; 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 5031da177e4SLinus Torvalds goto out; 5041da177e4SLinus Torvalds err = -ENOMEM; 5051da177e4SLinus Torvalds buf = kmalloc(mlen, GFP_KERNEL); 5061da177e4SLinus Torvalds if (!buf) 5071da177e4SLinus Torvalds goto out; 5081da177e4SLinus Torvalds 509b185f835STrond Myklebust clnt = RPC_I(inode)->private; 5101da177e4SLinus Torvalds err = -EFAULT; 5111da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 5121da177e4SLinus Torvalds goto err; 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 5151da177e4SLinus Torvalds p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 5161da177e4SLinus Torvalds if (IS_ERR(p)) { 5171da177e4SLinus Torvalds err = PTR_ERR(p); 5181da177e4SLinus Torvalds goto err; 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds err = -ENOMEM; 5221da177e4SLinus Torvalds ctx = gss_alloc_context(); 5231da177e4SLinus Torvalds if (ctx == NULL) 5241da177e4SLinus Torvalds goto err; 5253b68aaeaSTrond Myklebust 5263b68aaeaSTrond Myklebust err = -ENOENT; 5273b68aaeaSTrond Myklebust /* Find a matching upcall */ 5283b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5296e84c7b6STrond Myklebust gss_msg = __gss_find_upcall(RPC_I(inode), uid); 5303b68aaeaSTrond Myklebust if (gss_msg == NULL) { 5313b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5323b68aaeaSTrond Myklebust goto err_put_ctx; 5333b68aaeaSTrond Myklebust } 5343b68aaeaSTrond Myklebust list_del_init(&gss_msg->list); 5353b68aaeaSTrond Myklebust spin_unlock(&inode->i_lock); 5363b68aaeaSTrond Myklebust 5376e84c7b6STrond Myklebust p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 5381da177e4SLinus Torvalds if (IS_ERR(p)) { 5391da177e4SLinus Torvalds err = PTR_ERR(p); 5403b68aaeaSTrond Myklebust gss_msg->msg.errno = (err == -EACCES) ? -EACCES : -EAGAIN; 5413b68aaeaSTrond Myklebust goto err_release_msg; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 5443b68aaeaSTrond Myklebust err = mlen; 5453b68aaeaSTrond Myklebust 5463b68aaeaSTrond Myklebust err_release_msg: 5473b68aaeaSTrond Myklebust spin_lock(&inode->i_lock); 5481da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 549b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5501da177e4SLinus Torvalds gss_release_msg(gss_msg); 5511da177e4SLinus Torvalds err_put_ctx: 5521da177e4SLinus Torvalds gss_put_ctx(ctx); 5531da177e4SLinus Torvalds err: 5541da177e4SLinus Torvalds kfree(buf); 5551da177e4SLinus Torvalds out: 5563b68aaeaSTrond Myklebust dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 5571da177e4SLinus Torvalds return err; 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds static void 5611da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 5621da177e4SLinus Torvalds { 5631da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 5641da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5651da177e4SLinus Torvalds 5666e84c7b6STrond Myklebust spin_lock(&inode->i_lock); 5676e84c7b6STrond Myklebust while (!list_empty(&rpci->in_downcall)) { 5686e84c7b6STrond Myklebust 5696e84c7b6STrond Myklebust gss_msg = list_entry(rpci->in_downcall.next, 5701da177e4SLinus Torvalds struct gss_upcall_msg, list); 5711da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 5721da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5731da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 574b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5751da177e4SLinus Torvalds gss_release_msg(gss_msg); 576b185f835STrond Myklebust spin_lock(&inode->i_lock); 5771da177e4SLinus Torvalds } 578b185f835STrond Myklebust spin_unlock(&inode->i_lock); 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds static void 5821da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 5831da177e4SLinus Torvalds { 5841da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 5851da177e4SLinus Torvalds static unsigned long ratelimit; 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds if (msg->errno < 0) { 5881da177e4SLinus Torvalds dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 5891da177e4SLinus Torvalds gss_msg); 5901da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 5911da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 59248e49187STrond Myklebust if (msg->errno == -ETIMEDOUT) { 5931da177e4SLinus Torvalds unsigned long now = jiffies; 5941da177e4SLinus Torvalds if (time_after(now, ratelimit)) { 5951da177e4SLinus Torvalds printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 5961da177e4SLinus Torvalds "Please check user daemon is running!\n"); 5971da177e4SLinus Torvalds ratelimit = now + 15*HZ; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds } 6001da177e4SLinus Torvalds gss_release_msg(gss_msg); 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds } 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds /* 6051da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 6061da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 6071da177e4SLinus Torvalds */ 6081da177e4SLinus Torvalds static struct rpc_auth * 6091da177e4SLinus Torvalds gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 6101da177e4SLinus Torvalds { 6111da177e4SLinus Torvalds struct gss_auth *gss_auth; 6121da177e4SLinus Torvalds struct rpc_auth * auth; 6136a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 6186a19275aSJ. Bruce Fields return ERR_PTR(err); 6191da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 6201da177e4SLinus Torvalds goto out_dec; 6211da177e4SLinus Torvalds gss_auth->client = clnt; 6226a19275aSJ. Bruce Fields err = -EINVAL; 6231da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 6241da177e4SLinus Torvalds if (!gss_auth->mech) { 6251da177e4SLinus Torvalds printk(KERN_WARNING "%s: Pseudoflavor %d not found!", 6261da177e4SLinus Torvalds __FUNCTION__, flavor); 6271da177e4SLinus Torvalds goto err_free; 6281da177e4SLinus Torvalds } 6291da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 630438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 631438b6fdeSJ. Bruce Fields goto err_put_mech; 6321da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 6331da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 6341da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 6351da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 6361da177e4SLinus Torvalds auth->au_flavor = flavor; 6371da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 6381da177e4SLinus Torvalds 639158998b6STrond Myklebust gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, 640158998b6STrond Myklebust clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 6416a19275aSJ. Bruce Fields if (IS_ERR(gss_auth->dentry)) { 6426a19275aSJ. Bruce Fields err = PTR_ERR(gss_auth->dentry); 6431da177e4SLinus Torvalds goto err_put_mech; 6446a19275aSJ. Bruce Fields } 6451da177e4SLinus Torvalds 64607a2bf1dSTrond Myklebust err = rpcauth_init_credcache(auth, GSS_CRED_EXPIRE); 64707a2bf1dSTrond Myklebust if (err) 64807a2bf1dSTrond Myklebust goto err_unlink_pipe; 64907a2bf1dSTrond Myklebust 6501da177e4SLinus Torvalds return auth; 65107a2bf1dSTrond Myklebust err_unlink_pipe: 65207a2bf1dSTrond Myklebust rpc_unlink(gss_auth->dentry); 6531da177e4SLinus Torvalds err_put_mech: 6541da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 6551da177e4SLinus Torvalds err_free: 6561da177e4SLinus Torvalds kfree(gss_auth); 6571da177e4SLinus Torvalds out_dec: 6581da177e4SLinus Torvalds module_put(THIS_MODULE); 6596a19275aSJ. Bruce Fields return ERR_PTR(err); 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds static void 6631da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 6641da177e4SLinus Torvalds { 6651da177e4SLinus Torvalds struct gss_auth *gss_auth; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 6681da177e4SLinus Torvalds auth, auth->au_flavor); 6691da177e4SLinus Torvalds 6703ab9bb72STrond Myklebust rpcauth_destroy_credcache(auth); 6713ab9bb72STrond Myklebust 6721da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 6735d67476fSTrond Myklebust rpc_unlink(gss_auth->dentry); 67412de3b35STrond Myklebust gss_auth->dentry = NULL; 6751da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds kfree(gss_auth); 6781da177e4SLinus Torvalds module_put(THIS_MODULE); 6791da177e4SLinus Torvalds } 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds /* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure 6821da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 6831da177e4SLinus Torvalds * allocated before freeing them. */ 6841da177e4SLinus Torvalds static void 6851da177e4SLinus Torvalds gss_destroy_ctx(struct gss_cl_ctx *ctx) 6861da177e4SLinus Torvalds { 6871da177e4SLinus Torvalds dprintk("RPC: gss_destroy_ctx\n"); 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds if (ctx->gc_gss_ctx) 6901da177e4SLinus Torvalds gss_delete_sec_context(&ctx->gc_gss_ctx); 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 6931da177e4SLinus Torvalds kfree(ctx); 6941da177e4SLinus Torvalds } 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds static void 6971da177e4SLinus Torvalds gss_destroy_cred(struct rpc_cred *rc) 6981da177e4SLinus Torvalds { 6991da177e4SLinus Torvalds struct gss_cred *cred = container_of(rc, struct gss_cred, gc_base); 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds dprintk("RPC: gss_destroy_cred \n"); 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds if (cred->gc_ctx) 7041da177e4SLinus Torvalds gss_put_ctx(cred->gc_ctx); 7051da177e4SLinus Torvalds kfree(cred); 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds /* 7091da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 7101da177e4SLinus Torvalds */ 7111da177e4SLinus Torvalds static struct rpc_cred * 7128a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7131da177e4SLinus Torvalds { 7148a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds static struct rpc_cred * 7188a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7191da177e4SLinus Torvalds { 7201da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 7211da177e4SLinus Torvalds struct gss_cred *cred = NULL; 7221da177e4SLinus Torvalds int err = -ENOMEM; 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 7251da177e4SLinus Torvalds acred->uid, auth->au_flavor); 7261da177e4SLinus Torvalds 7270da974f4SPanagiotis Issaris if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL))) 7281da177e4SLinus Torvalds goto out_err; 7291da177e4SLinus Torvalds 7305fe4755eSTrond Myklebust rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 7311da177e4SLinus Torvalds /* 7321da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 7331da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 7341da177e4SLinus Torvalds */ 735fc432dd9STrond Myklebust cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 7361da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 7371da177e4SLinus Torvalds return &cred->gc_base; 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds out_err: 7401da177e4SLinus Torvalds dprintk("RPC: gss_create_cred failed with error %d\n", err); 7411da177e4SLinus Torvalds return ERR_PTR(err); 7421da177e4SLinus Torvalds } 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds static int 745fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 746fba3bad4STrond Myklebust { 747fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 748fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 749fba3bad4STrond Myklebust int err; 750fba3bad4STrond Myklebust 751fba3bad4STrond Myklebust do { 752fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 753fba3bad4STrond Myklebust } while (err == -EAGAIN); 754fba3bad4STrond Myklebust return err; 755fba3bad4STrond Myklebust } 756fba3bad4STrond Myklebust 757fba3bad4STrond Myklebust static int 7588a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 7591da177e4SLinus Torvalds { 7601da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 7611da177e4SLinus Torvalds 7628a317760STrond Myklebust /* 7638a317760STrond Myklebust * If the searchflags have set RPCAUTH_LOOKUP_NEW, then 7648a317760STrond Myklebust * we don't really care if the credential has expired or not, 7658a317760STrond Myklebust * since the caller should be prepared to reinitialise it. 7668a317760STrond Myklebust */ 767fc432dd9STrond Myklebust if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 7688a317760STrond Myklebust goto out; 7691da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 7701da177e4SLinus Torvalds if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 7711da177e4SLinus Torvalds return 0; 7728a317760STrond Myklebust out: 7731da177e4SLinus Torvalds return (rc->cr_uid == acred->uid); 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds /* 7771da177e4SLinus Torvalds * Marshal credentials. 7781da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 7791da177e4SLinus Torvalds */ 780d8ed029dSAlexey Dobriyan static __be32 * 781d8ed029dSAlexey Dobriyan gss_marshal(struct rpc_task *task, __be32 *p) 7821da177e4SLinus Torvalds { 7831da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 7841da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 7851da177e4SLinus Torvalds gc_base); 7861da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 787d8ed029dSAlexey Dobriyan __be32 *cred_len; 7881da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 7891da177e4SLinus Torvalds u32 maj_stat = 0; 7901da177e4SLinus Torvalds struct xdr_netobj mic; 7911da177e4SLinus Torvalds struct kvec iov; 7921da177e4SLinus Torvalds struct xdr_buf verf_buf; 7931da177e4SLinus Torvalds 7948885cb36SChuck Lever dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 7971da177e4SLinus Torvalds cred_len = p++; 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 8001da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 8011da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 8041da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 8051da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 8061da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 8071da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 8081da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 8111da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 812808012fbSChuck Lever iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 813808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 8141da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 8151da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds /* set verifier flavor*/ 8181da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 82100fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 8221da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 823fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 8241da177e4SLinus Torvalds } else if (maj_stat != 0) { 8251da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 8261da177e4SLinus Torvalds goto out_put_ctx; 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 8291da177e4SLinus Torvalds gss_put_ctx(ctx); 8301da177e4SLinus Torvalds return p; 8311da177e4SLinus Torvalds out_put_ctx: 8321da177e4SLinus Torvalds gss_put_ctx(ctx); 8331da177e4SLinus Torvalds return NULL; 8341da177e4SLinus Torvalds } 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds /* 8371da177e4SLinus Torvalds * Refresh credentials. XXX - finish 8381da177e4SLinus Torvalds */ 8391da177e4SLinus Torvalds static int 8401da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 8411da177e4SLinus Torvalds { 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) 8441da177e4SLinus Torvalds return gss_refresh_upcall(task); 8451da177e4SLinus Torvalds return 0; 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds 848d8ed029dSAlexey Dobriyan static __be32 * 849d8ed029dSAlexey Dobriyan gss_validate(struct rpc_task *task, __be32 *p) 8501da177e4SLinus Torvalds { 8511da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 8521da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 853d8ed029dSAlexey Dobriyan __be32 seq; 8541da177e4SLinus Torvalds struct kvec iov; 8551da177e4SLinus Torvalds struct xdr_buf verf_buf; 8561da177e4SLinus Torvalds struct xdr_netobj mic; 8571da177e4SLinus Torvalds u32 flav,len; 8581da177e4SLinus Torvalds u32 maj_stat; 8591da177e4SLinus Torvalds 8608885cb36SChuck Lever dprintk("RPC: %5u gss_validate\n", task->tk_pid); 8611da177e4SLinus Torvalds 8621da177e4SLinus Torvalds flav = ntohl(*p++); 8631da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 8641da177e4SLinus Torvalds goto out_bad; 8651da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 8661da177e4SLinus Torvalds goto out_bad; 8671da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 8681da177e4SLinus Torvalds iov.iov_base = &seq; 8691da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 8701da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 8711da177e4SLinus Torvalds mic.data = (u8 *)p; 8721da177e4SLinus Torvalds mic.len = len; 8731da177e4SLinus Torvalds 87400fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 8751da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 876fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 8771da177e4SLinus Torvalds if (maj_stat) 8781da177e4SLinus Torvalds goto out_bad; 87924b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 88024b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 88124b2605bSJ. Bruce Fields task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2; 8821da177e4SLinus Torvalds gss_put_ctx(ctx); 8838885cb36SChuck Lever dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 8841da177e4SLinus Torvalds task->tk_pid); 8851da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 8861da177e4SLinus Torvalds out_bad: 8871da177e4SLinus Torvalds gss_put_ctx(ctx); 8888885cb36SChuck Lever dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 8891da177e4SLinus Torvalds return NULL; 8901da177e4SLinus Torvalds } 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds static inline int 8931da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 894d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 8951da177e4SLinus Torvalds { 8961da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 8971da177e4SLinus Torvalds struct xdr_buf integ_buf; 898d8ed029dSAlexey Dobriyan __be32 *integ_len = NULL; 8991da177e4SLinus Torvalds struct xdr_netobj mic; 900d8ed029dSAlexey Dobriyan u32 offset; 901d8ed029dSAlexey Dobriyan __be32 *q; 9021da177e4SLinus Torvalds struct kvec *iov; 9031da177e4SLinus Torvalds u32 maj_stat = 0; 9041da177e4SLinus Torvalds int status = -EIO; 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds integ_len = p++; 9071da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 9081da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds status = encode(rqstp, p, obj); 9111da177e4SLinus Torvalds if (status) 9121da177e4SLinus Torvalds return status; 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 9151da177e4SLinus Torvalds offset, snd_buf->len - offset)) 9161da177e4SLinus Torvalds return status; 9171da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 9201da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 9211da177e4SLinus Torvalds iov = snd_buf->tail; 9221da177e4SLinus Torvalds else 9231da177e4SLinus Torvalds iov = snd_buf->head; 9241da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 9251da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 9261da177e4SLinus Torvalds 92700fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 9281da177e4SLinus Torvalds status = -EIO; /* XXX? */ 9291da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 930fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 9311da177e4SLinus Torvalds else if (maj_stat) 9321da177e4SLinus Torvalds return status; 9331da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 9341da177e4SLinus Torvalds 9351da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 9361da177e4SLinus Torvalds iov->iov_len += offset; 9371da177e4SLinus Torvalds snd_buf->len += offset; 9381da177e4SLinus Torvalds return 0; 9391da177e4SLinus Torvalds } 9401da177e4SLinus Torvalds 9412d2da60cSJ. Bruce Fields static void 9422d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 9432d2da60cSJ. Bruce Fields { 9442d2da60cSJ. Bruce Fields int i; 9452d2da60cSJ. Bruce Fields 9462d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 9472d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 9482d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 9492d2da60cSJ. Bruce Fields } 9502d2da60cSJ. Bruce Fields 9512d2da60cSJ. Bruce Fields static int 9522d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 9532d2da60cSJ. Bruce Fields { 9542d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 9552d2da60cSJ. Bruce Fields int first, last, i; 9562d2da60cSJ. Bruce Fields 9572d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 9582d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 9592d2da60cSJ. Bruce Fields return 0; 9602d2da60cSJ. Bruce Fields } 9612d2da60cSJ. Bruce Fields 9622d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 9632d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 9642d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 9652d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 9662d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 9672d2da60cSJ. Bruce Fields GFP_NOFS); 9682d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 9692d2da60cSJ. Bruce Fields goto out; 9702d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 9712d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 9722d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 9732d2da60cSJ. Bruce Fields goto out_free; 9742d2da60cSJ. Bruce Fields } 9752d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 9762d2da60cSJ. Bruce Fields return 0; 9772d2da60cSJ. Bruce Fields out_free: 9782d2da60cSJ. Bruce Fields for (i--; i >= 0; i--) { 9792d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 9802d2da60cSJ. Bruce Fields } 9812d2da60cSJ. Bruce Fields out: 9822d2da60cSJ. Bruce Fields return -EAGAIN; 9832d2da60cSJ. Bruce Fields } 9842d2da60cSJ. Bruce Fields 9852d2da60cSJ. Bruce Fields static inline int 9862d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 987d8ed029dSAlexey Dobriyan kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 9882d2da60cSJ. Bruce Fields { 9892d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 9902d2da60cSJ. Bruce Fields u32 offset; 9912d2da60cSJ. Bruce Fields u32 maj_stat; 9922d2da60cSJ. Bruce Fields int status; 993d8ed029dSAlexey Dobriyan __be32 *opaque_len; 9942d2da60cSJ. Bruce Fields struct page **inpages; 9952d2da60cSJ. Bruce Fields int first; 9962d2da60cSJ. Bruce Fields int pad; 9972d2da60cSJ. Bruce Fields struct kvec *iov; 9982d2da60cSJ. Bruce Fields char *tmp; 9992d2da60cSJ. Bruce Fields 10002d2da60cSJ. Bruce Fields opaque_len = p++; 10012d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 10022d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 10032d2da60cSJ. Bruce Fields 10042d2da60cSJ. Bruce Fields status = encode(rqstp, p, obj); 10052d2da60cSJ. Bruce Fields if (status) 10062d2da60cSJ. Bruce Fields return status; 10072d2da60cSJ. Bruce Fields 10082d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 10092d2da60cSJ. Bruce Fields if (status) 10102d2da60cSJ. Bruce Fields return status; 10112d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 10122d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 10132d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 10142d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 10152d2da60cSJ. Bruce Fields /* Give the tail its own page, in case we need extra space in the 10162d2da60cSJ. Bruce Fields * head when wrapping: */ 10172d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 10182d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 10192d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 10202d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 10212d2da60cSJ. Bruce Fields } 102200fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 10232d2da60cSJ. Bruce Fields /* RPC_SLACK_SPACE should prevent this ever happening: */ 10242d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 10252d2da60cSJ. Bruce Fields status = -EIO; 10262d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 10272d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 10282d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1029fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 10302d2da60cSJ. Bruce Fields else if (maj_stat) 10312d2da60cSJ. Bruce Fields return status; 10322d2da60cSJ. Bruce Fields 10332d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 10342d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 10352d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 10362d2da60cSJ. Bruce Fields iov = snd_buf->tail; 10372d2da60cSJ. Bruce Fields else 10382d2da60cSJ. Bruce Fields iov = snd_buf->head; 10392d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 10402d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 10412d2da60cSJ. Bruce Fields memset(p, 0, pad); 10422d2da60cSJ. Bruce Fields iov->iov_len += pad; 10432d2da60cSJ. Bruce Fields snd_buf->len += pad; 10442d2da60cSJ. Bruce Fields 10452d2da60cSJ. Bruce Fields return 0; 10462d2da60cSJ. Bruce Fields } 10472d2da60cSJ. Bruce Fields 10481da177e4SLinus Torvalds static int 10491da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 1050d8ed029dSAlexey Dobriyan kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 10511da177e4SLinus Torvalds { 10521da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 10531da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 10541da177e4SLinus Torvalds gc_base); 10551da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 10561da177e4SLinus Torvalds int status = -EIO; 10571da177e4SLinus Torvalds 10588885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 10591da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 10601da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 10611da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 10621da177e4SLinus Torvalds */ 10631da177e4SLinus Torvalds status = encode(rqstp, p, obj); 10641da177e4SLinus Torvalds goto out; 10651da177e4SLinus Torvalds } 10661da177e4SLinus Torvalds switch (gss_cred->gc_service) { 10671da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 10681da177e4SLinus Torvalds status = encode(rqstp, p, obj); 10691da177e4SLinus Torvalds break; 10701da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 10711da177e4SLinus Torvalds status = gss_wrap_req_integ(cred, ctx, encode, 10721da177e4SLinus Torvalds rqstp, p, obj); 10731da177e4SLinus Torvalds break; 10741da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 10752d2da60cSJ. Bruce Fields status = gss_wrap_req_priv(cred, ctx, encode, 10762d2da60cSJ. Bruce Fields rqstp, p, obj); 10771da177e4SLinus Torvalds break; 10781da177e4SLinus Torvalds } 10791da177e4SLinus Torvalds out: 10801da177e4SLinus Torvalds gss_put_ctx(ctx); 10818885cb36SChuck Lever dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 10821da177e4SLinus Torvalds return status; 10831da177e4SLinus Torvalds } 10841da177e4SLinus Torvalds 10851da177e4SLinus Torvalds static inline int 10861da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1087d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 10881da177e4SLinus Torvalds { 10891da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 10901da177e4SLinus Torvalds struct xdr_buf integ_buf; 10911da177e4SLinus Torvalds struct xdr_netobj mic; 10921da177e4SLinus Torvalds u32 data_offset, mic_offset; 10931da177e4SLinus Torvalds u32 integ_len; 10941da177e4SLinus Torvalds u32 maj_stat; 10951da177e4SLinus Torvalds int status = -EIO; 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 10981da177e4SLinus Torvalds if (integ_len & 3) 10991da177e4SLinus Torvalds return status; 11001da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 11011da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 11021da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 11031da177e4SLinus Torvalds return status; 11041da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 11051da177e4SLinus Torvalds return status; 11061da177e4SLinus Torvalds 11071da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 11081da177e4SLinus Torvalds mic_offset - data_offset)) 11091da177e4SLinus Torvalds return status; 11101da177e4SLinus Torvalds 11111da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 11121da177e4SLinus Torvalds return status; 11131da177e4SLinus Torvalds 111400fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 11151da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1116fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11171da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 11181da177e4SLinus Torvalds return status; 11191da177e4SLinus Torvalds return 0; 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds 11222d2da60cSJ. Bruce Fields static inline int 11232d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1124d8ed029dSAlexey Dobriyan struct rpc_rqst *rqstp, __be32 **p) 11252d2da60cSJ. Bruce Fields { 11262d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 11272d2da60cSJ. Bruce Fields u32 offset; 11282d2da60cSJ. Bruce Fields u32 opaque_len; 11292d2da60cSJ. Bruce Fields u32 maj_stat; 11302d2da60cSJ. Bruce Fields int status = -EIO; 11312d2da60cSJ. Bruce Fields 11322d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 11332d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 11342d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 11352d2da60cSJ. Bruce Fields return status; 11362d2da60cSJ. Bruce Fields /* remove padding: */ 11372d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 11382d2da60cSJ. Bruce Fields 113900fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 11402d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1141fc432dd9STrond Myklebust clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 11422d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 11432d2da60cSJ. Bruce Fields return status; 11442d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 11452d2da60cSJ. Bruce Fields return status; 11462d2da60cSJ. Bruce Fields 11472d2da60cSJ. Bruce Fields return 0; 11482d2da60cSJ. Bruce Fields } 11492d2da60cSJ. Bruce Fields 11502d2da60cSJ. Bruce Fields 11511da177e4SLinus Torvalds static int 11521da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 1153d8ed029dSAlexey Dobriyan kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 11541da177e4SLinus Torvalds { 11551da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 11561da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 11571da177e4SLinus Torvalds gc_base); 11581da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1159d8ed029dSAlexey Dobriyan __be32 *savedp = p; 11602d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 11612d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 11621da177e4SLinus Torvalds int status = -EIO; 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 11651da177e4SLinus Torvalds goto out_decode; 11661da177e4SLinus Torvalds switch (gss_cred->gc_service) { 11671da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 11681da177e4SLinus Torvalds break; 11691da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 11701da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 11711da177e4SLinus Torvalds if (status) 11721da177e4SLinus Torvalds goto out; 11731da177e4SLinus Torvalds break; 11741da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 11752d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 11762d2da60cSJ. Bruce Fields if (status) 11772d2da60cSJ. Bruce Fields goto out; 11781da177e4SLinus Torvalds break; 11791da177e4SLinus Torvalds } 118024b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 11812d2da60cSJ. Bruce Fields task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp) 11822d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 11831da177e4SLinus Torvalds out_decode: 11841da177e4SLinus Torvalds status = decode(rqstp, p, obj); 11851da177e4SLinus Torvalds out: 11861da177e4SLinus Torvalds gss_put_ctx(ctx); 11878885cb36SChuck Lever dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 11881da177e4SLinus Torvalds status); 11891da177e4SLinus Torvalds return status; 11901da177e4SLinus Torvalds } 11911da177e4SLinus Torvalds 1192f1c0a861STrond Myklebust static const struct rpc_authops authgss_ops = { 11931da177e4SLinus Torvalds .owner = THIS_MODULE, 11941da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 11951da177e4SLinus Torvalds #ifdef RPC_DEBUG 11961da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 11971da177e4SLinus Torvalds #endif 11981da177e4SLinus Torvalds .create = gss_create, 11991da177e4SLinus Torvalds .destroy = gss_destroy, 12001da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 12011da177e4SLinus Torvalds .crcreate = gss_create_cred 12021da177e4SLinus Torvalds }; 12031da177e4SLinus Torvalds 1204f1c0a861STrond Myklebust static const struct rpc_credops gss_credops = { 12051da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 12061da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1207fba3bad4STrond Myklebust .cr_init = gss_cred_init, 12081da177e4SLinus Torvalds .crmatch = gss_match, 12091da177e4SLinus Torvalds .crmarshal = gss_marshal, 12101da177e4SLinus Torvalds .crrefresh = gss_refresh, 12111da177e4SLinus Torvalds .crvalidate = gss_validate, 12121da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 12131da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 12141da177e4SLinus Torvalds }; 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops = { 12171da177e4SLinus Torvalds .upcall = gss_pipe_upcall, 12181da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 12191da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 12201da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 12211da177e4SLinus Torvalds }; 12221da177e4SLinus Torvalds 12231da177e4SLinus Torvalds /* 12241da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 12251da177e4SLinus Torvalds */ 12261da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 12271da177e4SLinus Torvalds { 12281da177e4SLinus Torvalds int err = 0; 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 12311da177e4SLinus Torvalds if (err) 12321da177e4SLinus Torvalds goto out; 12331da177e4SLinus Torvalds err = gss_svc_init(); 12341da177e4SLinus Torvalds if (err) 12351da177e4SLinus Torvalds goto out_unregister; 12361da177e4SLinus Torvalds return 0; 12371da177e4SLinus Torvalds out_unregister: 12381da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 12391da177e4SLinus Torvalds out: 12401da177e4SLinus Torvalds return err; 12411da177e4SLinus Torvalds } 12421da177e4SLinus Torvalds 12431da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 12441da177e4SLinus Torvalds { 12451da177e4SLinus Torvalds gss_svc_shutdown(); 12461da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 12471da177e4SLinus Torvalds } 12481da177e4SLinus Torvalds 12491da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 12501da177e4SLinus Torvalds module_init(init_rpcsec_gss) 12511da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1252