11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/net/sunrpc/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 571da177e4SLinus Torvalds static struct rpc_authops authgss_ops; 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds static 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): */ 711da177e4SLinus Torvalds #define GSS_VERF_SLACK 56 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 list_head upcalls; 891da177e4SLinus Torvalds struct rpc_clnt *client; 901da177e4SLinus Torvalds struct dentry *dentry; 91f134585aSTrond Myklebust char path[48]; 921da177e4SLinus Torvalds spinlock_t lock; 931da177e4SLinus Torvalds }; 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds static void gss_destroy_ctx(struct gss_cl_ctx *); 961da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops; 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds void 991da177e4SLinus Torvalds print_hexl(u32 *p, u_int length, u_int offset) 1001da177e4SLinus Torvalds { 1011da177e4SLinus Torvalds u_int i, j, jm; 1021da177e4SLinus Torvalds u8 c, *cp; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds dprintk("RPC: print_hexl: length %d\n",length); 1051da177e4SLinus Torvalds dprintk("\n"); 1061da177e4SLinus Torvalds cp = (u8 *) p; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds for (i = 0; i < length; i += 0x10) { 1091da177e4SLinus Torvalds dprintk(" %04x: ", (u_int)(i + offset)); 1101da177e4SLinus Torvalds jm = length - i; 1111da177e4SLinus Torvalds jm = jm > 16 ? 16 : jm; 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds for (j = 0; j < jm; j++) { 1141da177e4SLinus Torvalds if ((j % 2) == 1) 1151da177e4SLinus Torvalds dprintk("%02x ", (u_int)cp[i+j]); 1161da177e4SLinus Torvalds else 1171da177e4SLinus Torvalds dprintk("%02x", (u_int)cp[i+j]); 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds for (; j < 16; j++) { 1201da177e4SLinus Torvalds if ((j % 2) == 1) 1211da177e4SLinus Torvalds dprintk(" "); 1221da177e4SLinus Torvalds else 1231da177e4SLinus Torvalds dprintk(" "); 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds dprintk(" "); 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds for (j = 0; j < jm; j++) { 1281da177e4SLinus Torvalds c = cp[i+j]; 1291da177e4SLinus Torvalds c = isprint(c) ? c : '.'; 1301da177e4SLinus Torvalds dprintk("%c", c); 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds dprintk("\n"); 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds EXPORT_SYMBOL(print_hexl); 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds static inline struct gss_cl_ctx * 1391da177e4SLinus Torvalds gss_get_ctx(struct gss_cl_ctx *ctx) 1401da177e4SLinus Torvalds { 1411da177e4SLinus Torvalds atomic_inc(&ctx->count); 1421da177e4SLinus Torvalds return ctx; 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds static inline void 1461da177e4SLinus Torvalds gss_put_ctx(struct gss_cl_ctx *ctx) 1471da177e4SLinus Torvalds { 1481da177e4SLinus Torvalds if (atomic_dec_and_test(&ctx->count)) 1491da177e4SLinus Torvalds gss_destroy_ctx(ctx); 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds static void 1531da177e4SLinus Torvalds gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1561da177e4SLinus Torvalds struct gss_cl_ctx *old; 1571da177e4SLinus Torvalds write_lock(&gss_ctx_lock); 1581da177e4SLinus Torvalds old = gss_cred->gc_ctx; 1591da177e4SLinus Torvalds gss_cred->gc_ctx = ctx; 1601da177e4SLinus Torvalds cred->cr_flags |= RPCAUTH_CRED_UPTODATE; 1618a317760STrond Myklebust cred->cr_flags &= ~RPCAUTH_CRED_NEW; 1621da177e4SLinus Torvalds write_unlock(&gss_ctx_lock); 1631da177e4SLinus Torvalds if (old) 1641da177e4SLinus Torvalds gss_put_ctx(old); 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds static int 1681da177e4SLinus Torvalds gss_cred_is_uptodate_ctx(struct rpc_cred *cred) 1691da177e4SLinus Torvalds { 1701da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 1711da177e4SLinus Torvalds int res = 0; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds read_lock(&gss_ctx_lock); 1741da177e4SLinus Torvalds if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx) 1751da177e4SLinus Torvalds res = 1; 1761da177e4SLinus Torvalds read_unlock(&gss_ctx_lock); 1771da177e4SLinus Torvalds return res; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds static const void * 1811da177e4SLinus Torvalds simple_get_bytes(const void *p, const void *end, void *res, size_t len) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds const void *q = (const void *)((const char *)p + len); 1841da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 1851da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 1861da177e4SLinus Torvalds memcpy(res, p, len); 1871da177e4SLinus Torvalds return q; 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds static inline const void * 1911da177e4SLinus Torvalds simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 1921da177e4SLinus Torvalds { 1931da177e4SLinus Torvalds const void *q; 1941da177e4SLinus Torvalds unsigned int len; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds p = simple_get_bytes(p, end, &len, sizeof(len)); 1971da177e4SLinus Torvalds if (IS_ERR(p)) 1981da177e4SLinus Torvalds return p; 1991da177e4SLinus Torvalds q = (const void *)((const char *)p + len); 2001da177e4SLinus Torvalds if (unlikely(q > end || q < p)) 2011da177e4SLinus Torvalds return ERR_PTR(-EFAULT); 2021da177e4SLinus Torvalds dest->data = kmalloc(len, GFP_KERNEL); 2031da177e4SLinus Torvalds if (unlikely(dest->data == NULL)) 2041da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 2051da177e4SLinus Torvalds dest->len = len; 2061da177e4SLinus Torvalds memcpy(dest->data, p, len); 2071da177e4SLinus Torvalds return q; 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds static struct gss_cl_ctx * 2111da177e4SLinus Torvalds gss_cred_get_ctx(struct rpc_cred *cred) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 2141da177e4SLinus Torvalds struct gss_cl_ctx *ctx = NULL; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds read_lock(&gss_ctx_lock); 2171da177e4SLinus Torvalds if (gss_cred->gc_ctx) 2181da177e4SLinus Torvalds ctx = gss_get_ctx(gss_cred->gc_ctx); 2191da177e4SLinus Torvalds read_unlock(&gss_ctx_lock); 2201da177e4SLinus Torvalds return ctx; 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds static struct gss_cl_ctx * 2241da177e4SLinus Torvalds gss_alloc_context(void) 2251da177e4SLinus Torvalds { 2261da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 2291da177e4SLinus Torvalds if (ctx != NULL) { 2301da177e4SLinus Torvalds memset(ctx, 0, sizeof(*ctx)); 2311da177e4SLinus Torvalds ctx->gc_proc = RPC_GSS_PROC_DATA; 2321da177e4SLinus Torvalds ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 2331da177e4SLinus Torvalds spin_lock_init(&ctx->gc_seq_lock); 2341da177e4SLinus Torvalds atomic_set(&ctx->count,1); 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds return ctx; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds #define GSSD_MIN_TIMEOUT (60 * 60) 2401da177e4SLinus Torvalds static const void * 2411da177e4SLinus Torvalds gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 2421da177e4SLinus Torvalds { 2431da177e4SLinus Torvalds const void *q; 2441da177e4SLinus Torvalds unsigned int seclen; 2451da177e4SLinus Torvalds unsigned int timeout; 2461da177e4SLinus Torvalds u32 window_size; 2471da177e4SLinus Torvalds int ret; 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds /* First unsigned int gives the lifetime (in seconds) of the cred */ 2501da177e4SLinus Torvalds p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 2511da177e4SLinus Torvalds if (IS_ERR(p)) 2521da177e4SLinus Torvalds goto err; 2531da177e4SLinus Torvalds if (timeout == 0) 2541da177e4SLinus Torvalds timeout = GSSD_MIN_TIMEOUT; 2551da177e4SLinus Torvalds ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 2561da177e4SLinus Torvalds /* Sequence number window. Determines the maximum number of simultaneous requests */ 2571da177e4SLinus Torvalds p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 2581da177e4SLinus Torvalds if (IS_ERR(p)) 2591da177e4SLinus Torvalds goto err; 2601da177e4SLinus Torvalds ctx->gc_win = window_size; 2611da177e4SLinus Torvalds /* gssd signals an error by passing ctx->gc_win = 0: */ 2621da177e4SLinus Torvalds if (ctx->gc_win == 0) { 2631da177e4SLinus Torvalds /* in which case, p points to an error code which we ignore */ 2641da177e4SLinus Torvalds p = ERR_PTR(-EACCES); 2651da177e4SLinus Torvalds goto err; 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds /* copy the opaque wire context */ 2681da177e4SLinus Torvalds p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 2691da177e4SLinus Torvalds if (IS_ERR(p)) 2701da177e4SLinus Torvalds goto err; 2711da177e4SLinus Torvalds /* import the opaque security context */ 2721da177e4SLinus Torvalds p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 2731da177e4SLinus Torvalds if (IS_ERR(p)) 2741da177e4SLinus Torvalds goto err; 2751da177e4SLinus Torvalds q = (const void *)((const char *)p + seclen); 2761da177e4SLinus Torvalds if (unlikely(q > end || q < p)) { 2771da177e4SLinus Torvalds p = ERR_PTR(-EFAULT); 2781da177e4SLinus Torvalds goto err; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 2811da177e4SLinus Torvalds if (ret < 0) { 2821da177e4SLinus Torvalds p = ERR_PTR(ret); 2831da177e4SLinus Torvalds goto err; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds return q; 2861da177e4SLinus Torvalds err: 2871da177e4SLinus Torvalds dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 2881da177e4SLinus Torvalds return p; 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds struct gss_upcall_msg { 2931da177e4SLinus Torvalds atomic_t count; 2941da177e4SLinus Torvalds uid_t uid; 2951da177e4SLinus Torvalds struct rpc_pipe_msg msg; 2961da177e4SLinus Torvalds struct list_head list; 2971da177e4SLinus Torvalds struct gss_auth *auth; 2981da177e4SLinus Torvalds struct rpc_wait_queue rpc_waitqueue; 2991da177e4SLinus Torvalds wait_queue_head_t waitqueue; 3001da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 3011da177e4SLinus Torvalds }; 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds static void 3041da177e4SLinus Torvalds gss_release_msg(struct gss_upcall_msg *gss_msg) 3051da177e4SLinus Torvalds { 3061da177e4SLinus Torvalds if (!atomic_dec_and_test(&gss_msg->count)) 3071da177e4SLinus Torvalds return; 3081da177e4SLinus Torvalds BUG_ON(!list_empty(&gss_msg->list)); 3091da177e4SLinus Torvalds if (gss_msg->ctx != NULL) 3101da177e4SLinus Torvalds gss_put_ctx(gss_msg->ctx); 3111da177e4SLinus Torvalds kfree(gss_msg); 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds static struct gss_upcall_msg * 3151da177e4SLinus Torvalds __gss_find_upcall(struct gss_auth *gss_auth, uid_t uid) 3161da177e4SLinus Torvalds { 3171da177e4SLinus Torvalds struct gss_upcall_msg *pos; 3181da177e4SLinus Torvalds list_for_each_entry(pos, &gss_auth->upcalls, list) { 3191da177e4SLinus Torvalds if (pos->uid != uid) 3201da177e4SLinus Torvalds continue; 3211da177e4SLinus Torvalds atomic_inc(&pos->count); 3221da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found msg %p\n", pos); 3231da177e4SLinus Torvalds return pos; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds dprintk("RPC: gss_find_upcall found nothing\n"); 3261da177e4SLinus Torvalds return NULL; 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds /* Try to add a upcall to the pipefs queue. 3301da177e4SLinus Torvalds * If an upcall owned by our uid already exists, then we return a reference 3311da177e4SLinus Torvalds * to that upcall instead of adding the new upcall. 3321da177e4SLinus Torvalds */ 3331da177e4SLinus Torvalds static inline struct gss_upcall_msg * 3341da177e4SLinus Torvalds gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) 3351da177e4SLinus Torvalds { 3361da177e4SLinus Torvalds struct gss_upcall_msg *old; 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds spin_lock(&gss_auth->lock); 3391da177e4SLinus Torvalds old = __gss_find_upcall(gss_auth, gss_msg->uid); 3401da177e4SLinus Torvalds if (old == NULL) { 3411da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 3421da177e4SLinus Torvalds list_add(&gss_msg->list, &gss_auth->upcalls); 3431da177e4SLinus Torvalds } else 3441da177e4SLinus Torvalds gss_msg = old; 3451da177e4SLinus Torvalds spin_unlock(&gss_auth->lock); 3461da177e4SLinus Torvalds return gss_msg; 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds static void 3501da177e4SLinus Torvalds __gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3511da177e4SLinus Torvalds { 3521da177e4SLinus Torvalds if (list_empty(&gss_msg->list)) 3531da177e4SLinus Torvalds return; 3541da177e4SLinus Torvalds list_del_init(&gss_msg->list); 3551da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3561da177e4SLinus Torvalds wake_up_all(&gss_msg->waitqueue); 3571da177e4SLinus Torvalds atomic_dec(&gss_msg->count); 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds static void 3611da177e4SLinus Torvalds gss_unhash_msg(struct gss_upcall_msg *gss_msg) 3621da177e4SLinus Torvalds { 3631da177e4SLinus Torvalds struct gss_auth *gss_auth = gss_msg->auth; 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds spin_lock(&gss_auth->lock); 3661da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 3671da177e4SLinus Torvalds spin_unlock(&gss_auth->lock); 3681da177e4SLinus Torvalds } 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds static void 3711da177e4SLinus Torvalds gss_upcall_callback(struct rpc_task *task) 3721da177e4SLinus Torvalds { 3731da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 3741da177e4SLinus Torvalds struct gss_cred, gc_base); 3751da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds BUG_ON(gss_msg == NULL); 3781da177e4SLinus Torvalds if (gss_msg->ctx) 3791da177e4SLinus Torvalds gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); 3801da177e4SLinus Torvalds else 3811da177e4SLinus Torvalds task->tk_status = gss_msg->msg.errno; 3821da177e4SLinus Torvalds spin_lock(&gss_msg->auth->lock); 3831da177e4SLinus Torvalds gss_cred->gc_upcall = NULL; 3841da177e4SLinus Torvalds rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 3851da177e4SLinus Torvalds spin_unlock(&gss_msg->auth->lock); 3861da177e4SLinus Torvalds gss_release_msg(gss_msg); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds static inline struct gss_upcall_msg * 3901da177e4SLinus Torvalds gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) 3911da177e4SLinus Torvalds { 3921da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds gss_msg = kmalloc(sizeof(*gss_msg), GFP_KERNEL); 3951da177e4SLinus Torvalds if (gss_msg != NULL) { 3961da177e4SLinus Torvalds memset(gss_msg, 0, sizeof(*gss_msg)); 3971da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_msg->list); 3981da177e4SLinus Torvalds rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 3991da177e4SLinus Torvalds init_waitqueue_head(&gss_msg->waitqueue); 4001da177e4SLinus Torvalds atomic_set(&gss_msg->count, 1); 4011da177e4SLinus Torvalds gss_msg->msg.data = &gss_msg->uid; 4021da177e4SLinus Torvalds gss_msg->msg.len = sizeof(gss_msg->uid); 4031da177e4SLinus Torvalds gss_msg->uid = uid; 4041da177e4SLinus Torvalds gss_msg->auth = gss_auth; 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds return gss_msg; 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds static struct gss_upcall_msg * 4101da177e4SLinus Torvalds gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 4111da177e4SLinus Torvalds { 4121da177e4SLinus Torvalds struct gss_upcall_msg *gss_new, *gss_msg; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); 4151da177e4SLinus Torvalds if (gss_new == NULL) 4161da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 4171da177e4SLinus Torvalds gss_msg = gss_add_msg(gss_auth, gss_new); 4181da177e4SLinus Torvalds if (gss_msg == gss_new) { 4191da177e4SLinus Torvalds int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); 4201da177e4SLinus Torvalds if (res) { 4211da177e4SLinus Torvalds gss_unhash_msg(gss_new); 4221da177e4SLinus Torvalds gss_msg = ERR_PTR(res); 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds } else 4251da177e4SLinus Torvalds gss_release_msg(gss_new); 4261da177e4SLinus Torvalds return gss_msg; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds static inline int 4301da177e4SLinus Torvalds gss_refresh_upcall(struct rpc_task *task) 4311da177e4SLinus Torvalds { 4321da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 4331da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(task->tk_client->cl_auth, 4341da177e4SLinus Torvalds struct gss_auth, rpc_auth); 4351da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, 4361da177e4SLinus Torvalds struct gss_cred, gc_base); 4371da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 4381da177e4SLinus Torvalds int err = 0; 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds dprintk("RPC: %4u gss_refresh_upcall for uid %u\n", task->tk_pid, cred->cr_uid); 4411da177e4SLinus Torvalds gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 4421da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4431da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4441da177e4SLinus Torvalds goto out; 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds spin_lock(&gss_auth->lock); 4471da177e4SLinus Torvalds if (gss_cred->gc_upcall != NULL) 4481da177e4SLinus Torvalds rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); 4491da177e4SLinus Torvalds else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 4501da177e4SLinus Torvalds task->tk_timeout = 0; 4511da177e4SLinus Torvalds gss_cred->gc_upcall = gss_msg; 4521da177e4SLinus Torvalds /* gss_upcall_callback will release the reference to gss_upcall_msg */ 4531da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 4541da177e4SLinus Torvalds rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); 4551da177e4SLinus Torvalds } else 4561da177e4SLinus Torvalds err = gss_msg->msg.errno; 4571da177e4SLinus Torvalds spin_unlock(&gss_auth->lock); 4581da177e4SLinus Torvalds gss_release_msg(gss_msg); 4591da177e4SLinus Torvalds out: 4601da177e4SLinus Torvalds dprintk("RPC: %4u gss_refresh_upcall for uid %u result %d\n", task->tk_pid, 4611da177e4SLinus Torvalds cred->cr_uid, err); 4621da177e4SLinus Torvalds return err; 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds static inline int 4661da177e4SLinus Torvalds gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 4671da177e4SLinus Torvalds { 4681da177e4SLinus Torvalds struct rpc_cred *cred = &gss_cred->gc_base; 4691da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 4701da177e4SLinus Torvalds DEFINE_WAIT(wait); 4711da177e4SLinus Torvalds int err = 0; 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 4741da177e4SLinus Torvalds gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 4751da177e4SLinus Torvalds if (IS_ERR(gss_msg)) { 4761da177e4SLinus Torvalds err = PTR_ERR(gss_msg); 4771da177e4SLinus Torvalds goto out; 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds for (;;) { 4801da177e4SLinus Torvalds prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 4811da177e4SLinus Torvalds spin_lock(&gss_auth->lock); 4821da177e4SLinus Torvalds if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 4831da177e4SLinus Torvalds spin_unlock(&gss_auth->lock); 4841da177e4SLinus Torvalds break; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds spin_unlock(&gss_auth->lock); 4871da177e4SLinus Torvalds if (signalled()) { 4881da177e4SLinus Torvalds err = -ERESTARTSYS; 4891da177e4SLinus Torvalds goto out_intr; 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds schedule(); 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds if (gss_msg->ctx) 4941da177e4SLinus Torvalds gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); 4951da177e4SLinus Torvalds else 4961da177e4SLinus Torvalds err = gss_msg->msg.errno; 4971da177e4SLinus Torvalds out_intr: 4981da177e4SLinus Torvalds finish_wait(&gss_msg->waitqueue, &wait); 4991da177e4SLinus Torvalds gss_release_msg(gss_msg); 5001da177e4SLinus Torvalds out: 5011da177e4SLinus Torvalds dprintk("RPC: gss_create_upcall for uid %u result %d\n", cred->cr_uid, err); 5021da177e4SLinus Torvalds return err; 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds static ssize_t 5061da177e4SLinus Torvalds gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 5071da177e4SLinus Torvalds char __user *dst, size_t buflen) 5081da177e4SLinus Torvalds { 5091da177e4SLinus Torvalds char *data = (char *)msg->data + msg->copied; 5101da177e4SLinus Torvalds ssize_t mlen = msg->len; 5111da177e4SLinus Torvalds ssize_t left; 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds if (mlen > buflen) 5141da177e4SLinus Torvalds mlen = buflen; 5151da177e4SLinus Torvalds left = copy_to_user(dst, data, mlen); 5161da177e4SLinus Torvalds if (left < 0) { 5171da177e4SLinus Torvalds msg->errno = left; 5181da177e4SLinus Torvalds return left; 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds mlen -= left; 5211da177e4SLinus Torvalds msg->copied += mlen; 5221da177e4SLinus Torvalds msg->errno = 0; 5231da177e4SLinus Torvalds return mlen; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds #define MSG_BUF_MAXSIZE 1024 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds static ssize_t 5291da177e4SLinus Torvalds gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 5301da177e4SLinus Torvalds { 5311da177e4SLinus Torvalds const void *p, *end; 5321da177e4SLinus Torvalds void *buf; 5331da177e4SLinus Torvalds struct rpc_clnt *clnt; 5341da177e4SLinus Torvalds struct gss_auth *gss_auth; 5351da177e4SLinus Torvalds struct rpc_cred *cred; 5361da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 5371da177e4SLinus Torvalds struct gss_cl_ctx *ctx; 5381da177e4SLinus Torvalds uid_t uid; 5391da177e4SLinus Torvalds int err = -EFBIG; 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds if (mlen > MSG_BUF_MAXSIZE) 5421da177e4SLinus Torvalds goto out; 5431da177e4SLinus Torvalds err = -ENOMEM; 5441da177e4SLinus Torvalds buf = kmalloc(mlen, GFP_KERNEL); 5451da177e4SLinus Torvalds if (!buf) 5461da177e4SLinus Torvalds goto out; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds clnt = RPC_I(filp->f_dentry->d_inode)->private; 5491da177e4SLinus Torvalds err = -EFAULT; 5501da177e4SLinus Torvalds if (copy_from_user(buf, src, mlen)) 5511da177e4SLinus Torvalds goto err; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds end = (const void *)((char *)buf + mlen); 5541da177e4SLinus Torvalds p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 5551da177e4SLinus Torvalds if (IS_ERR(p)) { 5561da177e4SLinus Torvalds err = PTR_ERR(p); 5571da177e4SLinus Torvalds goto err; 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds err = -ENOMEM; 5611da177e4SLinus Torvalds ctx = gss_alloc_context(); 5621da177e4SLinus Torvalds if (ctx == NULL) 5631da177e4SLinus Torvalds goto err; 5641da177e4SLinus Torvalds err = 0; 5651da177e4SLinus Torvalds gss_auth = container_of(clnt->cl_auth, struct gss_auth, rpc_auth); 5661da177e4SLinus Torvalds p = gss_fill_context(p, end, ctx, gss_auth->mech); 5671da177e4SLinus Torvalds if (IS_ERR(p)) { 5681da177e4SLinus Torvalds err = PTR_ERR(p); 5691da177e4SLinus Torvalds if (err != -EACCES) 5701da177e4SLinus Torvalds goto err_put_ctx; 5711da177e4SLinus Torvalds } 5721da177e4SLinus Torvalds spin_lock(&gss_auth->lock); 5731da177e4SLinus Torvalds gss_msg = __gss_find_upcall(gss_auth, uid); 5741da177e4SLinus Torvalds if (gss_msg) { 5751da177e4SLinus Torvalds if (err == 0 && gss_msg->ctx == NULL) 5761da177e4SLinus Torvalds gss_msg->ctx = gss_get_ctx(ctx); 5771da177e4SLinus Torvalds gss_msg->msg.errno = err; 5781da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 5791da177e4SLinus Torvalds spin_unlock(&gss_auth->lock); 5801da177e4SLinus Torvalds gss_release_msg(gss_msg); 5811da177e4SLinus Torvalds } else { 5821da177e4SLinus Torvalds struct auth_cred acred = { .uid = uid }; 5831da177e4SLinus Torvalds spin_unlock(&gss_auth->lock); 5848a317760STrond Myklebust cred = rpcauth_lookup_credcache(clnt->cl_auth, &acred, RPCAUTH_LOOKUP_NEW); 5851da177e4SLinus Torvalds if (IS_ERR(cred)) { 5861da177e4SLinus Torvalds err = PTR_ERR(cred); 5871da177e4SLinus Torvalds goto err_put_ctx; 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds gss_cred_set_ctx(cred, gss_get_ctx(ctx)); 5901da177e4SLinus Torvalds } 5911da177e4SLinus Torvalds gss_put_ctx(ctx); 5921da177e4SLinus Torvalds kfree(buf); 5931da177e4SLinus Torvalds dprintk("RPC: gss_pipe_downcall returning length %Zu\n", mlen); 5941da177e4SLinus Torvalds return mlen; 5951da177e4SLinus Torvalds err_put_ctx: 5961da177e4SLinus Torvalds gss_put_ctx(ctx); 5971da177e4SLinus Torvalds err: 5981da177e4SLinus Torvalds kfree(buf); 5991da177e4SLinus Torvalds out: 6001da177e4SLinus Torvalds dprintk("RPC: gss_pipe_downcall returning %d\n", err); 6011da177e4SLinus Torvalds return err; 6021da177e4SLinus Torvalds } 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds static void 6051da177e4SLinus Torvalds gss_pipe_release(struct inode *inode) 6061da177e4SLinus Torvalds { 6071da177e4SLinus Torvalds struct rpc_inode *rpci = RPC_I(inode); 6081da177e4SLinus Torvalds struct rpc_clnt *clnt; 6091da177e4SLinus Torvalds struct rpc_auth *auth; 6101da177e4SLinus Torvalds struct gss_auth *gss_auth; 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds clnt = rpci->private; 6131da177e4SLinus Torvalds auth = clnt->cl_auth; 6141da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 6151da177e4SLinus Torvalds spin_lock(&gss_auth->lock); 6161da177e4SLinus Torvalds while (!list_empty(&gss_auth->upcalls)) { 6171da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg; 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds gss_msg = list_entry(gss_auth->upcalls.next, 6201da177e4SLinus Torvalds struct gss_upcall_msg, list); 6211da177e4SLinus Torvalds gss_msg->msg.errno = -EPIPE; 6221da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 6231da177e4SLinus Torvalds __gss_unhash_msg(gss_msg); 6241da177e4SLinus Torvalds spin_unlock(&gss_auth->lock); 6251da177e4SLinus Torvalds gss_release_msg(gss_msg); 6261da177e4SLinus Torvalds spin_lock(&gss_auth->lock); 6271da177e4SLinus Torvalds } 6281da177e4SLinus Torvalds spin_unlock(&gss_auth->lock); 6291da177e4SLinus Torvalds } 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds static void 6321da177e4SLinus Torvalds gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 6331da177e4SLinus Torvalds { 6341da177e4SLinus Torvalds struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 6351da177e4SLinus Torvalds static unsigned long ratelimit; 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds if (msg->errno < 0) { 6381da177e4SLinus Torvalds dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 6391da177e4SLinus Torvalds gss_msg); 6401da177e4SLinus Torvalds atomic_inc(&gss_msg->count); 6411da177e4SLinus Torvalds gss_unhash_msg(gss_msg); 64248e49187STrond Myklebust if (msg->errno == -ETIMEDOUT) { 6431da177e4SLinus Torvalds unsigned long now = jiffies; 6441da177e4SLinus Torvalds if (time_after(now, ratelimit)) { 6451da177e4SLinus Torvalds printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 6461da177e4SLinus Torvalds "Please check user daemon is running!\n"); 6471da177e4SLinus Torvalds ratelimit = now + 15*HZ; 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds } 6501da177e4SLinus Torvalds gss_release_msg(gss_msg); 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds } 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds /* 6551da177e4SLinus Torvalds * NOTE: we have the opportunity to use different 6561da177e4SLinus Torvalds * parameters based on the input flavor (which must be a pseudoflavor) 6571da177e4SLinus Torvalds */ 6581da177e4SLinus Torvalds static struct rpc_auth * 6591da177e4SLinus Torvalds gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 6601da177e4SLinus Torvalds { 6611da177e4SLinus Torvalds struct gss_auth *gss_auth; 6621da177e4SLinus Torvalds struct rpc_auth * auth; 6636a19275aSJ. Bruce Fields int err = -ENOMEM; /* XXX? */ 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds dprintk("RPC: creating GSS authenticator for client %p\n",clnt); 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds if (!try_module_get(THIS_MODULE)) 6686a19275aSJ. Bruce Fields return ERR_PTR(err); 6691da177e4SLinus Torvalds if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 6701da177e4SLinus Torvalds goto out_dec; 6711da177e4SLinus Torvalds gss_auth->client = clnt; 6726a19275aSJ. Bruce Fields err = -EINVAL; 6731da177e4SLinus Torvalds gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 6741da177e4SLinus Torvalds if (!gss_auth->mech) { 6751da177e4SLinus Torvalds printk(KERN_WARNING "%s: Pseudoflavor %d not found!", 6761da177e4SLinus Torvalds __FUNCTION__, flavor); 6771da177e4SLinus Torvalds goto err_free; 6781da177e4SLinus Torvalds } 6791da177e4SLinus Torvalds gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 680438b6fdeSJ. Bruce Fields if (gss_auth->service == 0) 681438b6fdeSJ. Bruce Fields goto err_put_mech; 6821da177e4SLinus Torvalds INIT_LIST_HEAD(&gss_auth->upcalls); 6831da177e4SLinus Torvalds spin_lock_init(&gss_auth->lock); 6841da177e4SLinus Torvalds auth = &gss_auth->rpc_auth; 6851da177e4SLinus Torvalds auth->au_cslack = GSS_CRED_SLACK >> 2; 6861da177e4SLinus Torvalds auth->au_rslack = GSS_VERF_SLACK >> 2; 6871da177e4SLinus Torvalds auth->au_ops = &authgss_ops; 6881da177e4SLinus Torvalds auth->au_flavor = flavor; 6891da177e4SLinus Torvalds atomic_set(&auth->au_count, 1); 6901da177e4SLinus Torvalds 6916a19275aSJ. Bruce Fields err = rpcauth_init_credcache(auth, GSS_CRED_EXPIRE); 6926a19275aSJ. Bruce Fields if (err) 6931da177e4SLinus Torvalds goto err_put_mech; 6941da177e4SLinus Torvalds 695f134585aSTrond Myklebust snprintf(gss_auth->path, sizeof(gss_auth->path), "%s/%s", 696f134585aSTrond Myklebust clnt->cl_pathname, 697f134585aSTrond Myklebust gss_auth->mech->gm_name); 698f134585aSTrond Myklebust gss_auth->dentry = rpc_mkpipe(gss_auth->path, clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 6996a19275aSJ. Bruce Fields if (IS_ERR(gss_auth->dentry)) { 7006a19275aSJ. Bruce Fields err = PTR_ERR(gss_auth->dentry); 7011da177e4SLinus Torvalds goto err_put_mech; 7026a19275aSJ. Bruce Fields } 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds return auth; 7051da177e4SLinus Torvalds err_put_mech: 7061da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 7071da177e4SLinus Torvalds err_free: 7081da177e4SLinus Torvalds kfree(gss_auth); 7091da177e4SLinus Torvalds out_dec: 7101da177e4SLinus Torvalds module_put(THIS_MODULE); 7116a19275aSJ. Bruce Fields return ERR_PTR(err); 7121da177e4SLinus Torvalds } 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds static void 7151da177e4SLinus Torvalds gss_destroy(struct rpc_auth *auth) 7161da177e4SLinus Torvalds { 7171da177e4SLinus Torvalds struct gss_auth *gss_auth; 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 7201da177e4SLinus Torvalds auth, auth->au_flavor); 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds gss_auth = container_of(auth, struct gss_auth, rpc_auth); 723f134585aSTrond Myklebust rpc_unlink(gss_auth->path); 72412de3b35STrond Myklebust dput(gss_auth->dentry); 72512de3b35STrond Myklebust gss_auth->dentry = NULL; 7261da177e4SLinus Torvalds gss_mech_put(gss_auth->mech); 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds rpcauth_free_credcache(auth); 7291da177e4SLinus Torvalds kfree(gss_auth); 7301da177e4SLinus Torvalds module_put(THIS_MODULE); 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds /* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure 7341da177e4SLinus Torvalds * to create a new cred or context, so they check that things have been 7351da177e4SLinus Torvalds * allocated before freeing them. */ 7361da177e4SLinus Torvalds static void 7371da177e4SLinus Torvalds gss_destroy_ctx(struct gss_cl_ctx *ctx) 7381da177e4SLinus Torvalds { 7391da177e4SLinus Torvalds dprintk("RPC: gss_destroy_ctx\n"); 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds if (ctx->gc_gss_ctx) 7421da177e4SLinus Torvalds gss_delete_sec_context(&ctx->gc_gss_ctx); 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds kfree(ctx->gc_wire_ctx.data); 7451da177e4SLinus Torvalds kfree(ctx); 7461da177e4SLinus Torvalds } 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds static void 7491da177e4SLinus Torvalds gss_destroy_cred(struct rpc_cred *rc) 7501da177e4SLinus Torvalds { 7511da177e4SLinus Torvalds struct gss_cred *cred = container_of(rc, struct gss_cred, gc_base); 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds dprintk("RPC: gss_destroy_cred \n"); 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds if (cred->gc_ctx) 7561da177e4SLinus Torvalds gss_put_ctx(cred->gc_ctx); 7571da177e4SLinus Torvalds kfree(cred); 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds /* 7611da177e4SLinus Torvalds * Lookup RPCSEC_GSS cred for the current process 7621da177e4SLinus Torvalds */ 7631da177e4SLinus Torvalds static struct rpc_cred * 7648a317760STrond Myklebust gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7651da177e4SLinus Torvalds { 7668a317760STrond Myklebust return rpcauth_lookup_credcache(auth, acred, flags); 7671da177e4SLinus Torvalds } 7681da177e4SLinus Torvalds 7691da177e4SLinus Torvalds static struct rpc_cred * 7708a317760STrond Myklebust gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 7711da177e4SLinus Torvalds { 7721da177e4SLinus Torvalds struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 7731da177e4SLinus Torvalds struct gss_cred *cred = NULL; 7741da177e4SLinus Torvalds int err = -ENOMEM; 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 7771da177e4SLinus Torvalds acred->uid, auth->au_flavor); 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds if (!(cred = kmalloc(sizeof(*cred), GFP_KERNEL))) 7801da177e4SLinus Torvalds goto out_err; 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds memset(cred, 0, sizeof(*cred)); 7831da177e4SLinus Torvalds atomic_set(&cred->gc_count, 1); 7841da177e4SLinus Torvalds cred->gc_uid = acred->uid; 7851da177e4SLinus Torvalds /* 7861da177e4SLinus Torvalds * Note: in order to force a call to call_refresh(), we deliberately 7871da177e4SLinus Torvalds * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 7881da177e4SLinus Torvalds */ 7891da177e4SLinus Torvalds cred->gc_flags = 0; 7901da177e4SLinus Torvalds cred->gc_base.cr_ops = &gss_credops; 7918a317760STrond Myklebust cred->gc_base.cr_flags = RPCAUTH_CRED_NEW; 7921da177e4SLinus Torvalds cred->gc_service = gss_auth->service; 7931da177e4SLinus Torvalds return &cred->gc_base; 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds out_err: 7961da177e4SLinus Torvalds dprintk("RPC: gss_create_cred failed with error %d\n", err); 7971da177e4SLinus Torvalds if (cred) gss_destroy_cred(&cred->gc_base); 7981da177e4SLinus Torvalds return ERR_PTR(err); 7991da177e4SLinus Torvalds } 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds static int 802fba3bad4STrond Myklebust gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 803fba3bad4STrond Myklebust { 804fba3bad4STrond Myklebust struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 805fba3bad4STrond Myklebust struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 806fba3bad4STrond Myklebust int err; 807fba3bad4STrond Myklebust 808fba3bad4STrond Myklebust do { 809fba3bad4STrond Myklebust err = gss_create_upcall(gss_auth, gss_cred); 810fba3bad4STrond Myklebust } while (err == -EAGAIN); 811fba3bad4STrond Myklebust return err; 812fba3bad4STrond Myklebust } 813fba3bad4STrond Myklebust 814fba3bad4STrond Myklebust static int 8158a317760STrond Myklebust gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 8161da177e4SLinus Torvalds { 8171da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 8181da177e4SLinus Torvalds 8198a317760STrond Myklebust /* 8208a317760STrond Myklebust * If the searchflags have set RPCAUTH_LOOKUP_NEW, then 8218a317760STrond Myklebust * we don't really care if the credential has expired or not, 8228a317760STrond Myklebust * since the caller should be prepared to reinitialise it. 8238a317760STrond Myklebust */ 8248a317760STrond Myklebust if ((flags & RPCAUTH_LOOKUP_NEW) && (rc->cr_flags & RPCAUTH_CRED_NEW)) 8258a317760STrond Myklebust goto out; 8261da177e4SLinus Torvalds /* Don't match with creds that have expired. */ 8271da177e4SLinus Torvalds if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 8281da177e4SLinus Torvalds return 0; 8298a317760STrond Myklebust out: 8301da177e4SLinus Torvalds return (rc->cr_uid == acred->uid); 8311da177e4SLinus Torvalds } 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds /* 8341da177e4SLinus Torvalds * Marshal credentials. 8351da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 8361da177e4SLinus Torvalds */ 8371da177e4SLinus Torvalds static u32 * 8381da177e4SLinus Torvalds gss_marshal(struct rpc_task *task, u32 *p) 8391da177e4SLinus Torvalds { 8401da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 8411da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 8421da177e4SLinus Torvalds gc_base); 8431da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 8441da177e4SLinus Torvalds u32 *cred_len; 8451da177e4SLinus Torvalds struct rpc_rqst *req = task->tk_rqstp; 8461da177e4SLinus Torvalds u32 maj_stat = 0; 8471da177e4SLinus Torvalds struct xdr_netobj mic; 8481da177e4SLinus Torvalds struct kvec iov; 8491da177e4SLinus Torvalds struct xdr_buf verf_buf; 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds dprintk("RPC: %4u gss_marshal\n", task->tk_pid); 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8541da177e4SLinus Torvalds cred_len = p++; 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds spin_lock(&ctx->gc_seq_lock); 8571da177e4SLinus Torvalds req->rq_seqno = ctx->gc_seq++; 8581da177e4SLinus Torvalds spin_unlock(&ctx->gc_seq_lock); 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds *p++ = htonl((u32) RPC_GSS_VERSION); 8611da177e4SLinus Torvalds *p++ = htonl((u32) ctx->gc_proc); 8621da177e4SLinus Torvalds *p++ = htonl((u32) req->rq_seqno); 8631da177e4SLinus Torvalds *p++ = htonl((u32) gss_cred->gc_service); 8641da177e4SLinus Torvalds p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 8651da177e4SLinus Torvalds *cred_len = htonl((p - (cred_len + 1)) << 2); 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds /* We compute the checksum for the verifier over the xdr-encoded bytes 8681da177e4SLinus Torvalds * starting with the xid and ending at the end of the credential: */ 869808012fbSChuck Lever iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 870808012fbSChuck Lever req->rq_snd_buf.head[0].iov_base); 8711da177e4SLinus Torvalds iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 8721da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds /* set verifier flavor*/ 8751da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_GSS); 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 87800fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 8791da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 8801da177e4SLinus Torvalds cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; 8811da177e4SLinus Torvalds } else if (maj_stat != 0) { 8821da177e4SLinus Torvalds printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 8831da177e4SLinus Torvalds goto out_put_ctx; 8841da177e4SLinus Torvalds } 8851da177e4SLinus Torvalds p = xdr_encode_opaque(p, NULL, mic.len); 8861da177e4SLinus Torvalds gss_put_ctx(ctx); 8871da177e4SLinus Torvalds return p; 8881da177e4SLinus Torvalds out_put_ctx: 8891da177e4SLinus Torvalds gss_put_ctx(ctx); 8901da177e4SLinus Torvalds return NULL; 8911da177e4SLinus Torvalds } 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds /* 8941da177e4SLinus Torvalds * Refresh credentials. XXX - finish 8951da177e4SLinus Torvalds */ 8961da177e4SLinus Torvalds static int 8971da177e4SLinus Torvalds gss_refresh(struct rpc_task *task) 8981da177e4SLinus Torvalds { 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) 9011da177e4SLinus Torvalds return gss_refresh_upcall(task); 9021da177e4SLinus Torvalds return 0; 9031da177e4SLinus Torvalds } 9041da177e4SLinus Torvalds 9051da177e4SLinus Torvalds static u32 * 9061da177e4SLinus Torvalds gss_validate(struct rpc_task *task, u32 *p) 9071da177e4SLinus Torvalds { 9081da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 9091da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 91000fd6e14SJ. Bruce Fields u32 seq; 9111da177e4SLinus Torvalds struct kvec iov; 9121da177e4SLinus Torvalds struct xdr_buf verf_buf; 9131da177e4SLinus Torvalds struct xdr_netobj mic; 9141da177e4SLinus Torvalds u32 flav,len; 9151da177e4SLinus Torvalds u32 maj_stat; 9161da177e4SLinus Torvalds 9171da177e4SLinus Torvalds dprintk("RPC: %4u gss_validate\n", task->tk_pid); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds flav = ntohl(*p++); 9201da177e4SLinus Torvalds if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 9211da177e4SLinus Torvalds goto out_bad; 9221da177e4SLinus Torvalds if (flav != RPC_AUTH_GSS) 9231da177e4SLinus Torvalds goto out_bad; 9241da177e4SLinus Torvalds seq = htonl(task->tk_rqstp->rq_seqno); 9251da177e4SLinus Torvalds iov.iov_base = &seq; 9261da177e4SLinus Torvalds iov.iov_len = sizeof(seq); 9271da177e4SLinus Torvalds xdr_buf_from_iov(&iov, &verf_buf); 9281da177e4SLinus Torvalds mic.data = (u8 *)p; 9291da177e4SLinus Torvalds mic.len = len; 9301da177e4SLinus Torvalds 93100fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 9321da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 9331da177e4SLinus Torvalds cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; 9341da177e4SLinus Torvalds if (maj_stat) 9351da177e4SLinus Torvalds goto out_bad; 93624b2605bSJ. Bruce Fields /* We leave it to unwrap to calculate au_rslack. For now we just 93724b2605bSJ. Bruce Fields * calculate the length of the verifier: */ 93824b2605bSJ. Bruce Fields task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2; 9391da177e4SLinus Torvalds gss_put_ctx(ctx); 9401da177e4SLinus Torvalds dprintk("RPC: %4u GSS gss_validate: gss_verify_mic succeeded.\n", 9411da177e4SLinus Torvalds task->tk_pid); 9421da177e4SLinus Torvalds return p + XDR_QUADLEN(len); 9431da177e4SLinus Torvalds out_bad: 9441da177e4SLinus Torvalds gss_put_ctx(ctx); 9451da177e4SLinus Torvalds dprintk("RPC: %4u gss_validate failed.\n", task->tk_pid); 9461da177e4SLinus Torvalds return NULL; 9471da177e4SLinus Torvalds } 9481da177e4SLinus Torvalds 9491da177e4SLinus Torvalds static inline int 9501da177e4SLinus Torvalds gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 9511da177e4SLinus Torvalds kxdrproc_t encode, struct rpc_rqst *rqstp, u32 *p, void *obj) 9521da177e4SLinus Torvalds { 9531da177e4SLinus Torvalds struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 9541da177e4SLinus Torvalds struct xdr_buf integ_buf; 9551da177e4SLinus Torvalds u32 *integ_len = NULL; 9561da177e4SLinus Torvalds struct xdr_netobj mic; 9571da177e4SLinus Torvalds u32 offset, *q; 9581da177e4SLinus Torvalds struct kvec *iov; 9591da177e4SLinus Torvalds u32 maj_stat = 0; 9601da177e4SLinus Torvalds int status = -EIO; 9611da177e4SLinus Torvalds 9621da177e4SLinus Torvalds integ_len = p++; 9631da177e4SLinus Torvalds offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 9641da177e4SLinus Torvalds *p++ = htonl(rqstp->rq_seqno); 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds status = encode(rqstp, p, obj); 9671da177e4SLinus Torvalds if (status) 9681da177e4SLinus Torvalds return status; 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds if (xdr_buf_subsegment(snd_buf, &integ_buf, 9711da177e4SLinus Torvalds offset, snd_buf->len - offset)) 9721da177e4SLinus Torvalds return status; 9731da177e4SLinus Torvalds *integ_len = htonl(integ_buf.len); 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds /* guess whether we're in the head or the tail: */ 9761da177e4SLinus Torvalds if (snd_buf->page_len || snd_buf->tail[0].iov_len) 9771da177e4SLinus Torvalds iov = snd_buf->tail; 9781da177e4SLinus Torvalds else 9791da177e4SLinus Torvalds iov = snd_buf->head; 9801da177e4SLinus Torvalds p = iov->iov_base + iov->iov_len; 9811da177e4SLinus Torvalds mic.data = (u8 *)(p + 1); 9821da177e4SLinus Torvalds 98300fd6e14SJ. Bruce Fields maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 9841da177e4SLinus Torvalds status = -EIO; /* XXX? */ 9851da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 9861da177e4SLinus Torvalds cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; 9871da177e4SLinus Torvalds else if (maj_stat) 9881da177e4SLinus Torvalds return status; 9891da177e4SLinus Torvalds q = xdr_encode_opaque(p, NULL, mic.len); 9901da177e4SLinus Torvalds 9911da177e4SLinus Torvalds offset = (u8 *)q - (u8 *)p; 9921da177e4SLinus Torvalds iov->iov_len += offset; 9931da177e4SLinus Torvalds snd_buf->len += offset; 9941da177e4SLinus Torvalds return 0; 9951da177e4SLinus Torvalds } 9961da177e4SLinus Torvalds 9972d2da60cSJ. Bruce Fields static void 9982d2da60cSJ. Bruce Fields priv_release_snd_buf(struct rpc_rqst *rqstp) 9992d2da60cSJ. Bruce Fields { 10002d2da60cSJ. Bruce Fields int i; 10012d2da60cSJ. Bruce Fields 10022d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) 10032d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 10042d2da60cSJ. Bruce Fields kfree(rqstp->rq_enc_pages); 10052d2da60cSJ. Bruce Fields } 10062d2da60cSJ. Bruce Fields 10072d2da60cSJ. Bruce Fields static int 10082d2da60cSJ. Bruce Fields alloc_enc_pages(struct rpc_rqst *rqstp) 10092d2da60cSJ. Bruce Fields { 10102d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 10112d2da60cSJ. Bruce Fields int first, last, i; 10122d2da60cSJ. Bruce Fields 10132d2da60cSJ. Bruce Fields if (snd_buf->page_len == 0) { 10142d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = 0; 10152d2da60cSJ. Bruce Fields return 0; 10162d2da60cSJ. Bruce Fields } 10172d2da60cSJ. Bruce Fields 10182d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 10192d2da60cSJ. Bruce Fields last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 10202d2da60cSJ. Bruce Fields rqstp->rq_enc_pages_num = last - first + 1 + 1; 10212d2da60cSJ. Bruce Fields rqstp->rq_enc_pages 10222d2da60cSJ. Bruce Fields = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 10232d2da60cSJ. Bruce Fields GFP_NOFS); 10242d2da60cSJ. Bruce Fields if (!rqstp->rq_enc_pages) 10252d2da60cSJ. Bruce Fields goto out; 10262d2da60cSJ. Bruce Fields for (i=0; i < rqstp->rq_enc_pages_num; i++) { 10272d2da60cSJ. Bruce Fields rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 10282d2da60cSJ. Bruce Fields if (rqstp->rq_enc_pages[i] == NULL) 10292d2da60cSJ. Bruce Fields goto out_free; 10302d2da60cSJ. Bruce Fields } 10312d2da60cSJ. Bruce Fields rqstp->rq_release_snd_buf = priv_release_snd_buf; 10322d2da60cSJ. Bruce Fields return 0; 10332d2da60cSJ. Bruce Fields out_free: 10342d2da60cSJ. Bruce Fields for (i--; i >= 0; i--) { 10352d2da60cSJ. Bruce Fields __free_page(rqstp->rq_enc_pages[i]); 10362d2da60cSJ. Bruce Fields } 10372d2da60cSJ. Bruce Fields out: 10382d2da60cSJ. Bruce Fields return -EAGAIN; 10392d2da60cSJ. Bruce Fields } 10402d2da60cSJ. Bruce Fields 10412d2da60cSJ. Bruce Fields static inline int 10422d2da60cSJ. Bruce Fields gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 10432d2da60cSJ. Bruce Fields kxdrproc_t encode, struct rpc_rqst *rqstp, u32 *p, void *obj) 10442d2da60cSJ. Bruce Fields { 10452d2da60cSJ. Bruce Fields struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 10462d2da60cSJ. Bruce Fields u32 offset; 10472d2da60cSJ. Bruce Fields u32 maj_stat; 10482d2da60cSJ. Bruce Fields int status; 10492d2da60cSJ. Bruce Fields u32 *opaque_len; 10502d2da60cSJ. Bruce Fields struct page **inpages; 10512d2da60cSJ. Bruce Fields int first; 10522d2da60cSJ. Bruce Fields int pad; 10532d2da60cSJ. Bruce Fields struct kvec *iov; 10542d2da60cSJ. Bruce Fields char *tmp; 10552d2da60cSJ. Bruce Fields 10562d2da60cSJ. Bruce Fields opaque_len = p++; 10572d2da60cSJ. Bruce Fields offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 10582d2da60cSJ. Bruce Fields *p++ = htonl(rqstp->rq_seqno); 10592d2da60cSJ. Bruce Fields 10602d2da60cSJ. Bruce Fields status = encode(rqstp, p, obj); 10612d2da60cSJ. Bruce Fields if (status) 10622d2da60cSJ. Bruce Fields return status; 10632d2da60cSJ. Bruce Fields 10642d2da60cSJ. Bruce Fields status = alloc_enc_pages(rqstp); 10652d2da60cSJ. Bruce Fields if (status) 10662d2da60cSJ. Bruce Fields return status; 10672d2da60cSJ. Bruce Fields first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 10682d2da60cSJ. Bruce Fields inpages = snd_buf->pages + first; 10692d2da60cSJ. Bruce Fields snd_buf->pages = rqstp->rq_enc_pages; 10702d2da60cSJ. Bruce Fields snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 10712d2da60cSJ. Bruce Fields /* Give the tail its own page, in case we need extra space in the 10722d2da60cSJ. Bruce Fields * head when wrapping: */ 10732d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 10742d2da60cSJ. Bruce Fields tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 10752d2da60cSJ. Bruce Fields memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 10762d2da60cSJ. Bruce Fields snd_buf->tail[0].iov_base = tmp; 10772d2da60cSJ. Bruce Fields } 107800fd6e14SJ. Bruce Fields maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 10792d2da60cSJ. Bruce Fields /* RPC_SLACK_SPACE should prevent this ever happening: */ 10802d2da60cSJ. Bruce Fields BUG_ON(snd_buf->len > snd_buf->buflen); 10812d2da60cSJ. Bruce Fields status = -EIO; 10822d2da60cSJ. Bruce Fields /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 10832d2da60cSJ. Bruce Fields * done anyway, so it's safe to put the request on the wire: */ 10842d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 10852d2da60cSJ. Bruce Fields cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; 10862d2da60cSJ. Bruce Fields else if (maj_stat) 10872d2da60cSJ. Bruce Fields return status; 10882d2da60cSJ. Bruce Fields 10892d2da60cSJ. Bruce Fields *opaque_len = htonl(snd_buf->len - offset); 10902d2da60cSJ. Bruce Fields /* guess whether we're in the head or the tail: */ 10912d2da60cSJ. Bruce Fields if (snd_buf->page_len || snd_buf->tail[0].iov_len) 10922d2da60cSJ. Bruce Fields iov = snd_buf->tail; 10932d2da60cSJ. Bruce Fields else 10942d2da60cSJ. Bruce Fields iov = snd_buf->head; 10952d2da60cSJ. Bruce Fields p = iov->iov_base + iov->iov_len; 10962d2da60cSJ. Bruce Fields pad = 3 - ((snd_buf->len - offset - 1) & 3); 10972d2da60cSJ. Bruce Fields memset(p, 0, pad); 10982d2da60cSJ. Bruce Fields iov->iov_len += pad; 10992d2da60cSJ. Bruce Fields snd_buf->len += pad; 11002d2da60cSJ. Bruce Fields 11012d2da60cSJ. Bruce Fields return 0; 11022d2da60cSJ. Bruce Fields } 11032d2da60cSJ. Bruce Fields 11041da177e4SLinus Torvalds static int 11051da177e4SLinus Torvalds gss_wrap_req(struct rpc_task *task, 11061da177e4SLinus Torvalds kxdrproc_t encode, void *rqstp, u32 *p, void *obj) 11071da177e4SLinus Torvalds { 11081da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 11091da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 11101da177e4SLinus Torvalds gc_base); 11111da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 11121da177e4SLinus Torvalds int status = -EIO; 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds dprintk("RPC: %4u gss_wrap_req\n", task->tk_pid); 11151da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 11161da177e4SLinus Torvalds /* The spec seems a little ambiguous here, but I think that not 11171da177e4SLinus Torvalds * wrapping context destruction requests makes the most sense. 11181da177e4SLinus Torvalds */ 11191da177e4SLinus Torvalds status = encode(rqstp, p, obj); 11201da177e4SLinus Torvalds goto out; 11211da177e4SLinus Torvalds } 11221da177e4SLinus Torvalds switch (gss_cred->gc_service) { 11231da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 11241da177e4SLinus Torvalds status = encode(rqstp, p, obj); 11251da177e4SLinus Torvalds break; 11261da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 11271da177e4SLinus Torvalds status = gss_wrap_req_integ(cred, ctx, encode, 11281da177e4SLinus Torvalds rqstp, p, obj); 11291da177e4SLinus Torvalds break; 11301da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 11312d2da60cSJ. Bruce Fields status = gss_wrap_req_priv(cred, ctx, encode, 11322d2da60cSJ. Bruce Fields rqstp, p, obj); 11331da177e4SLinus Torvalds break; 11341da177e4SLinus Torvalds } 11351da177e4SLinus Torvalds out: 11361da177e4SLinus Torvalds gss_put_ctx(ctx); 11371da177e4SLinus Torvalds dprintk("RPC: %4u gss_wrap_req returning %d\n", task->tk_pid, status); 11381da177e4SLinus Torvalds return status; 11391da177e4SLinus Torvalds } 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds static inline int 11421da177e4SLinus Torvalds gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 11431da177e4SLinus Torvalds struct rpc_rqst *rqstp, u32 **p) 11441da177e4SLinus Torvalds { 11451da177e4SLinus Torvalds struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 11461da177e4SLinus Torvalds struct xdr_buf integ_buf; 11471da177e4SLinus Torvalds struct xdr_netobj mic; 11481da177e4SLinus Torvalds u32 data_offset, mic_offset; 11491da177e4SLinus Torvalds u32 integ_len; 11501da177e4SLinus Torvalds u32 maj_stat; 11511da177e4SLinus Torvalds int status = -EIO; 11521da177e4SLinus Torvalds 11531da177e4SLinus Torvalds integ_len = ntohl(*(*p)++); 11541da177e4SLinus Torvalds if (integ_len & 3) 11551da177e4SLinus Torvalds return status; 11561da177e4SLinus Torvalds data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 11571da177e4SLinus Torvalds mic_offset = integ_len + data_offset; 11581da177e4SLinus Torvalds if (mic_offset > rcv_buf->len) 11591da177e4SLinus Torvalds return status; 11601da177e4SLinus Torvalds if (ntohl(*(*p)++) != rqstp->rq_seqno) 11611da177e4SLinus Torvalds return status; 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 11641da177e4SLinus Torvalds mic_offset - data_offset)) 11651da177e4SLinus Torvalds return status; 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 11681da177e4SLinus Torvalds return status; 11691da177e4SLinus Torvalds 117000fd6e14SJ. Bruce Fields maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 11711da177e4SLinus Torvalds if (maj_stat == GSS_S_CONTEXT_EXPIRED) 11721da177e4SLinus Torvalds cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; 11731da177e4SLinus Torvalds if (maj_stat != GSS_S_COMPLETE) 11741da177e4SLinus Torvalds return status; 11751da177e4SLinus Torvalds return 0; 11761da177e4SLinus Torvalds } 11771da177e4SLinus Torvalds 11782d2da60cSJ. Bruce Fields static inline int 11792d2da60cSJ. Bruce Fields gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 11802d2da60cSJ. Bruce Fields struct rpc_rqst *rqstp, u32 **p) 11812d2da60cSJ. Bruce Fields { 11822d2da60cSJ. Bruce Fields struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 11832d2da60cSJ. Bruce Fields u32 offset; 11842d2da60cSJ. Bruce Fields u32 opaque_len; 11852d2da60cSJ. Bruce Fields u32 maj_stat; 11862d2da60cSJ. Bruce Fields int status = -EIO; 11872d2da60cSJ. Bruce Fields 11882d2da60cSJ. Bruce Fields opaque_len = ntohl(*(*p)++); 11892d2da60cSJ. Bruce Fields offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 11902d2da60cSJ. Bruce Fields if (offset + opaque_len > rcv_buf->len) 11912d2da60cSJ. Bruce Fields return status; 11922d2da60cSJ. Bruce Fields /* remove padding: */ 11932d2da60cSJ. Bruce Fields rcv_buf->len = offset + opaque_len; 11942d2da60cSJ. Bruce Fields 119500fd6e14SJ. Bruce Fields maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 11962d2da60cSJ. Bruce Fields if (maj_stat == GSS_S_CONTEXT_EXPIRED) 11972d2da60cSJ. Bruce Fields cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE; 11982d2da60cSJ. Bruce Fields if (maj_stat != GSS_S_COMPLETE) 11992d2da60cSJ. Bruce Fields return status; 12002d2da60cSJ. Bruce Fields if (ntohl(*(*p)++) != rqstp->rq_seqno) 12012d2da60cSJ. Bruce Fields return status; 12022d2da60cSJ. Bruce Fields 12032d2da60cSJ. Bruce Fields return 0; 12042d2da60cSJ. Bruce Fields } 12052d2da60cSJ. Bruce Fields 12062d2da60cSJ. Bruce Fields 12071da177e4SLinus Torvalds static int 12081da177e4SLinus Torvalds gss_unwrap_resp(struct rpc_task *task, 12091da177e4SLinus Torvalds kxdrproc_t decode, void *rqstp, u32 *p, void *obj) 12101da177e4SLinus Torvalds { 12111da177e4SLinus Torvalds struct rpc_cred *cred = task->tk_msg.rpc_cred; 12121da177e4SLinus Torvalds struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 12131da177e4SLinus Torvalds gc_base); 12141da177e4SLinus Torvalds struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 121524b2605bSJ. Bruce Fields u32 *savedp = p; 12162d2da60cSJ. Bruce Fields struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 12172d2da60cSJ. Bruce Fields int savedlen = head->iov_len; 12181da177e4SLinus Torvalds int status = -EIO; 12191da177e4SLinus Torvalds 12201da177e4SLinus Torvalds if (ctx->gc_proc != RPC_GSS_PROC_DATA) 12211da177e4SLinus Torvalds goto out_decode; 12221da177e4SLinus Torvalds switch (gss_cred->gc_service) { 12231da177e4SLinus Torvalds case RPC_GSS_SVC_NONE: 12241da177e4SLinus Torvalds break; 12251da177e4SLinus Torvalds case RPC_GSS_SVC_INTEGRITY: 12261da177e4SLinus Torvalds status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 12271da177e4SLinus Torvalds if (status) 12281da177e4SLinus Torvalds goto out; 12291da177e4SLinus Torvalds break; 12301da177e4SLinus Torvalds case RPC_GSS_SVC_PRIVACY: 12312d2da60cSJ. Bruce Fields status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 12322d2da60cSJ. Bruce Fields if (status) 12332d2da60cSJ. Bruce Fields goto out; 12341da177e4SLinus Torvalds break; 12351da177e4SLinus Torvalds } 123624b2605bSJ. Bruce Fields /* take into account extra slack for integrity and privacy cases: */ 12372d2da60cSJ. Bruce Fields task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp) 12382d2da60cSJ. Bruce Fields + (savedlen - head->iov_len); 12391da177e4SLinus Torvalds out_decode: 12401da177e4SLinus Torvalds status = decode(rqstp, p, obj); 12411da177e4SLinus Torvalds out: 12421da177e4SLinus Torvalds gss_put_ctx(ctx); 12431da177e4SLinus Torvalds dprintk("RPC: %4u gss_unwrap_resp returning %d\n", task->tk_pid, 12441da177e4SLinus Torvalds status); 12451da177e4SLinus Torvalds return status; 12461da177e4SLinus Torvalds } 12471da177e4SLinus Torvalds 12481da177e4SLinus Torvalds static struct rpc_authops authgss_ops = { 12491da177e4SLinus Torvalds .owner = THIS_MODULE, 12501da177e4SLinus Torvalds .au_flavor = RPC_AUTH_GSS, 12511da177e4SLinus Torvalds #ifdef RPC_DEBUG 12521da177e4SLinus Torvalds .au_name = "RPCSEC_GSS", 12531da177e4SLinus Torvalds #endif 12541da177e4SLinus Torvalds .create = gss_create, 12551da177e4SLinus Torvalds .destroy = gss_destroy, 12561da177e4SLinus Torvalds .lookup_cred = gss_lookup_cred, 12571da177e4SLinus Torvalds .crcreate = gss_create_cred 12581da177e4SLinus Torvalds }; 12591da177e4SLinus Torvalds 12601da177e4SLinus Torvalds static struct rpc_credops gss_credops = { 12611da177e4SLinus Torvalds .cr_name = "AUTH_GSS", 12621da177e4SLinus Torvalds .crdestroy = gss_destroy_cred, 1263fba3bad4STrond Myklebust .cr_init = gss_cred_init, 12641da177e4SLinus Torvalds .crmatch = gss_match, 12651da177e4SLinus Torvalds .crmarshal = gss_marshal, 12661da177e4SLinus Torvalds .crrefresh = gss_refresh, 12671da177e4SLinus Torvalds .crvalidate = gss_validate, 12681da177e4SLinus Torvalds .crwrap_req = gss_wrap_req, 12691da177e4SLinus Torvalds .crunwrap_resp = gss_unwrap_resp, 12701da177e4SLinus Torvalds }; 12711da177e4SLinus Torvalds 12721da177e4SLinus Torvalds static struct rpc_pipe_ops gss_upcall_ops = { 12731da177e4SLinus Torvalds .upcall = gss_pipe_upcall, 12741da177e4SLinus Torvalds .downcall = gss_pipe_downcall, 12751da177e4SLinus Torvalds .destroy_msg = gss_pipe_destroy_msg, 12761da177e4SLinus Torvalds .release_pipe = gss_pipe_release, 12771da177e4SLinus Torvalds }; 12781da177e4SLinus Torvalds 12791da177e4SLinus Torvalds /* 12801da177e4SLinus Torvalds * Initialize RPCSEC_GSS module 12811da177e4SLinus Torvalds */ 12821da177e4SLinus Torvalds static int __init init_rpcsec_gss(void) 12831da177e4SLinus Torvalds { 12841da177e4SLinus Torvalds int err = 0; 12851da177e4SLinus Torvalds 12861da177e4SLinus Torvalds err = rpcauth_register(&authgss_ops); 12871da177e4SLinus Torvalds if (err) 12881da177e4SLinus Torvalds goto out; 12891da177e4SLinus Torvalds err = gss_svc_init(); 12901da177e4SLinus Torvalds if (err) 12911da177e4SLinus Torvalds goto out_unregister; 12921da177e4SLinus Torvalds return 0; 12931da177e4SLinus Torvalds out_unregister: 12941da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 12951da177e4SLinus Torvalds out: 12961da177e4SLinus Torvalds return err; 12971da177e4SLinus Torvalds } 12981da177e4SLinus Torvalds 12991da177e4SLinus Torvalds static void __exit exit_rpcsec_gss(void) 13001da177e4SLinus Torvalds { 13011da177e4SLinus Torvalds gss_svc_shutdown(); 13021da177e4SLinus Torvalds rpcauth_unregister(&authgss_ops); 13031da177e4SLinus Torvalds } 13041da177e4SLinus Torvalds 13051da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 13061da177e4SLinus Torvalds module_init(init_rpcsec_gss) 13071da177e4SLinus Torvalds module_exit(exit_rpcsec_gss) 1308