auth_gss.c revision 5d28dc82074f1e64b22c9424b161abc1f5d6bcdb
1/* 2 * linux/net/sunrpc/auth_gss/auth_gss.c 3 * 4 * RPCSEC_GSS client authentication. 5 * 6 * Copyright (c) 2000 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Dug Song <dugsong@monkey.org> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * $Id$ 38 */ 39 40 41#include <linux/module.h> 42#include <linux/init.h> 43#include <linux/types.h> 44#include <linux/slab.h> 45#include <linux/sched.h> 46#include <linux/pagemap.h> 47#include <linux/sunrpc/clnt.h> 48#include <linux/sunrpc/auth.h> 49#include <linux/sunrpc/auth_gss.h> 50#include <linux/sunrpc/svcauth_gss.h> 51#include <linux/sunrpc/gss_err.h> 52#include <linux/workqueue.h> 53#include <linux/sunrpc/rpc_pipe_fs.h> 54#include <linux/sunrpc/gss_api.h> 55#include <asm/uaccess.h> 56 57static const struct rpc_authops authgss_ops; 58 59static const struct rpc_credops gss_credops; 60 61#ifdef RPC_DEBUG 62# define RPCDBG_FACILITY RPCDBG_AUTH 63#endif 64 65#define NFS_NGROUPS 16 66 67#define GSS_CRED_SLACK 1024 /* XXX: unused */ 68/* length of a krb5 verifier (48), plus data added before arguments when 69 * using integrity (two 4-byte integers): */ 70#define GSS_VERF_SLACK 100 71 72/* XXX this define must match the gssd define 73* as it is passed to gssd to signal the use of 74* machine creds should be part of the shared rpc interface */ 75 76#define CA_RUN_AS_MACHINE 0x00000200 77 78/* dump the buffer in `emacs-hexl' style */ 79#define isprint(c) ((c > 0x1f) && (c < 0x7f)) 80 81struct gss_auth { 82 struct rpc_auth rpc_auth; 83 struct gss_api_mech *mech; 84 enum rpc_gss_svc service; 85 struct rpc_clnt *client; 86 struct dentry *dentry; 87}; 88 89static void gss_free_ctx(struct gss_cl_ctx *); 90static struct rpc_pipe_ops gss_upcall_ops; 91 92static inline struct gss_cl_ctx * 93gss_get_ctx(struct gss_cl_ctx *ctx) 94{ 95 atomic_inc(&ctx->count); 96 return ctx; 97} 98 99static inline void 100gss_put_ctx(struct gss_cl_ctx *ctx) 101{ 102 if (atomic_dec_and_test(&ctx->count)) 103 gss_free_ctx(ctx); 104} 105 106/* gss_cred_set_ctx: 107 * called by gss_upcall_callback and gss_create_upcall in order 108 * to set the gss context. The actual exchange of an old context 109 * and a new one is protected by the inode->i_lock. 110 */ 111static void 112gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 113{ 114 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 115 struct gss_cl_ctx *old; 116 117 old = gss_cred->gc_ctx; 118 rcu_assign_pointer(gss_cred->gc_ctx, ctx); 119 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 120 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 121 if (old) 122 gss_put_ctx(old); 123} 124 125static int 126gss_cred_is_uptodate_ctx(struct rpc_cred *cred) 127{ 128 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 129 int res = 0; 130 131 rcu_read_lock(); 132 if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx) 133 res = 1; 134 rcu_read_unlock(); 135 return res; 136} 137 138static const void * 139simple_get_bytes(const void *p, const void *end, void *res, size_t len) 140{ 141 const void *q = (const void *)((const char *)p + len); 142 if (unlikely(q > end || q < p)) 143 return ERR_PTR(-EFAULT); 144 memcpy(res, p, len); 145 return q; 146} 147 148static inline const void * 149simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 150{ 151 const void *q; 152 unsigned int len; 153 154 p = simple_get_bytes(p, end, &len, sizeof(len)); 155 if (IS_ERR(p)) 156 return p; 157 q = (const void *)((const char *)p + len); 158 if (unlikely(q > end || q < p)) 159 return ERR_PTR(-EFAULT); 160 dest->data = kmemdup(p, len, GFP_KERNEL); 161 if (unlikely(dest->data == NULL)) 162 return ERR_PTR(-ENOMEM); 163 dest->len = len; 164 return q; 165} 166 167static struct gss_cl_ctx * 168gss_cred_get_ctx(struct rpc_cred *cred) 169{ 170 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 171 struct gss_cl_ctx *ctx = NULL; 172 173 rcu_read_lock(); 174 if (gss_cred->gc_ctx) 175 ctx = gss_get_ctx(gss_cred->gc_ctx); 176 rcu_read_unlock(); 177 return ctx; 178} 179 180static struct gss_cl_ctx * 181gss_alloc_context(void) 182{ 183 struct gss_cl_ctx *ctx; 184 185 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 186 if (ctx != NULL) { 187 ctx->gc_proc = RPC_GSS_PROC_DATA; 188 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 189 spin_lock_init(&ctx->gc_seq_lock); 190 atomic_set(&ctx->count,1); 191 } 192 return ctx; 193} 194 195#define GSSD_MIN_TIMEOUT (60 * 60) 196static const void * 197gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 198{ 199 const void *q; 200 unsigned int seclen; 201 unsigned int timeout; 202 u32 window_size; 203 int ret; 204 205 /* First unsigned int gives the lifetime (in seconds) of the cred */ 206 p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 207 if (IS_ERR(p)) 208 goto err; 209 if (timeout == 0) 210 timeout = GSSD_MIN_TIMEOUT; 211 ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 212 /* Sequence number window. Determines the maximum number of simultaneous requests */ 213 p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 214 if (IS_ERR(p)) 215 goto err; 216 ctx->gc_win = window_size; 217 /* gssd signals an error by passing ctx->gc_win = 0: */ 218 if (ctx->gc_win == 0) { 219 /* in which case, p points to an error code which we ignore */ 220 p = ERR_PTR(-EACCES); 221 goto err; 222 } 223 /* copy the opaque wire context */ 224 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 225 if (IS_ERR(p)) 226 goto err; 227 /* import the opaque security context */ 228 p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 229 if (IS_ERR(p)) 230 goto err; 231 q = (const void *)((const char *)p + seclen); 232 if (unlikely(q > end || q < p)) { 233 p = ERR_PTR(-EFAULT); 234 goto err; 235 } 236 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 237 if (ret < 0) { 238 p = ERR_PTR(ret); 239 goto err; 240 } 241 return q; 242err: 243 dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 244 return p; 245} 246 247 248struct gss_upcall_msg { 249 atomic_t count; 250 uid_t uid; 251 struct rpc_pipe_msg msg; 252 struct list_head list; 253 struct gss_auth *auth; 254 struct rpc_wait_queue rpc_waitqueue; 255 wait_queue_head_t waitqueue; 256 struct gss_cl_ctx *ctx; 257}; 258 259static void 260gss_release_msg(struct gss_upcall_msg *gss_msg) 261{ 262 if (!atomic_dec_and_test(&gss_msg->count)) 263 return; 264 BUG_ON(!list_empty(&gss_msg->list)); 265 if (gss_msg->ctx != NULL) 266 gss_put_ctx(gss_msg->ctx); 267 kfree(gss_msg); 268} 269 270static struct gss_upcall_msg * 271__gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 272{ 273 struct gss_upcall_msg *pos; 274 list_for_each_entry(pos, &rpci->in_downcall, list) { 275 if (pos->uid != uid) 276 continue; 277 atomic_inc(&pos->count); 278 dprintk("RPC: gss_find_upcall found msg %p\n", pos); 279 return pos; 280 } 281 dprintk("RPC: gss_find_upcall found nothing\n"); 282 return NULL; 283} 284 285/* Try to add a upcall to the pipefs queue. 286 * If an upcall owned by our uid already exists, then we return a reference 287 * to that upcall instead of adding the new upcall. 288 */ 289static inline struct gss_upcall_msg * 290gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) 291{ 292 struct inode *inode = gss_auth->dentry->d_inode; 293 struct rpc_inode *rpci = RPC_I(inode); 294 struct gss_upcall_msg *old; 295 296 spin_lock(&inode->i_lock); 297 old = __gss_find_upcall(rpci, gss_msg->uid); 298 if (old == NULL) { 299 atomic_inc(&gss_msg->count); 300 list_add(&gss_msg->list, &rpci->in_downcall); 301 } else 302 gss_msg = old; 303 spin_unlock(&inode->i_lock); 304 return gss_msg; 305} 306 307static void 308__gss_unhash_msg(struct gss_upcall_msg *gss_msg) 309{ 310 list_del_init(&gss_msg->list); 311 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 312 wake_up_all(&gss_msg->waitqueue); 313 atomic_dec(&gss_msg->count); 314} 315 316static void 317gss_unhash_msg(struct gss_upcall_msg *gss_msg) 318{ 319 struct gss_auth *gss_auth = gss_msg->auth; 320 struct inode *inode = gss_auth->dentry->d_inode; 321 322 if (list_empty(&gss_msg->list)) 323 return; 324 spin_lock(&inode->i_lock); 325 if (!list_empty(&gss_msg->list)) 326 __gss_unhash_msg(gss_msg); 327 spin_unlock(&inode->i_lock); 328} 329 330static void 331gss_upcall_callback(struct rpc_task *task) 332{ 333 struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 334 struct gss_cred, gc_base); 335 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 336 struct inode *inode = gss_msg->auth->dentry->d_inode; 337 338 spin_lock(&inode->i_lock); 339 if (gss_msg->ctx) 340 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); 341 else 342 task->tk_status = gss_msg->msg.errno; 343 gss_cred->gc_upcall = NULL; 344 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 345 spin_unlock(&inode->i_lock); 346 gss_release_msg(gss_msg); 347} 348 349static inline struct gss_upcall_msg * 350gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) 351{ 352 struct gss_upcall_msg *gss_msg; 353 354 gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); 355 if (gss_msg != NULL) { 356 INIT_LIST_HEAD(&gss_msg->list); 357 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 358 init_waitqueue_head(&gss_msg->waitqueue); 359 atomic_set(&gss_msg->count, 1); 360 gss_msg->msg.data = &gss_msg->uid; 361 gss_msg->msg.len = sizeof(gss_msg->uid); 362 gss_msg->uid = uid; 363 gss_msg->auth = gss_auth; 364 } 365 return gss_msg; 366} 367 368static struct gss_upcall_msg * 369gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 370{ 371 struct gss_upcall_msg *gss_new, *gss_msg; 372 373 gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); 374 if (gss_new == NULL) 375 return ERR_PTR(-ENOMEM); 376 gss_msg = gss_add_msg(gss_auth, gss_new); 377 if (gss_msg == gss_new) { 378 int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); 379 if (res) { 380 gss_unhash_msg(gss_new); 381 gss_msg = ERR_PTR(res); 382 } 383 } else 384 gss_release_msg(gss_new); 385 return gss_msg; 386} 387 388static inline int 389gss_refresh_upcall(struct rpc_task *task) 390{ 391 struct rpc_cred *cred = task->tk_msg.rpc_cred; 392 struct gss_auth *gss_auth = container_of(cred->cr_auth, 393 struct gss_auth, rpc_auth); 394 struct gss_cred *gss_cred = container_of(cred, 395 struct gss_cred, gc_base); 396 struct gss_upcall_msg *gss_msg; 397 struct inode *inode = gss_auth->dentry->d_inode; 398 int err = 0; 399 400 dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 401 cred->cr_uid); 402 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 403 if (IS_ERR(gss_msg)) { 404 err = PTR_ERR(gss_msg); 405 goto out; 406 } 407 spin_lock(&inode->i_lock); 408 if (gss_cred->gc_upcall != NULL) 409 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); 410 else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { 411 task->tk_timeout = 0; 412 gss_cred->gc_upcall = gss_msg; 413 /* gss_upcall_callback will release the reference to gss_upcall_msg */ 414 atomic_inc(&gss_msg->count); 415 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); 416 } else 417 err = gss_msg->msg.errno; 418 spin_unlock(&inode->i_lock); 419 gss_release_msg(gss_msg); 420out: 421 dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 422 task->tk_pid, cred->cr_uid, err); 423 return err; 424} 425 426static inline int 427gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 428{ 429 struct inode *inode = gss_auth->dentry->d_inode; 430 struct rpc_cred *cred = &gss_cred->gc_base; 431 struct gss_upcall_msg *gss_msg; 432 DEFINE_WAIT(wait); 433 int err = 0; 434 435 dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 436 gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 437 if (IS_ERR(gss_msg)) { 438 err = PTR_ERR(gss_msg); 439 goto out; 440 } 441 for (;;) { 442 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 443 spin_lock(&inode->i_lock); 444 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 445 break; 446 } 447 spin_unlock(&inode->i_lock); 448 if (signalled()) { 449 err = -ERESTARTSYS; 450 goto out_intr; 451 } 452 schedule(); 453 } 454 if (gss_msg->ctx) 455 gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); 456 else 457 err = gss_msg->msg.errno; 458 spin_unlock(&inode->i_lock); 459out_intr: 460 finish_wait(&gss_msg->waitqueue, &wait); 461 gss_release_msg(gss_msg); 462out: 463 dprintk("RPC: gss_create_upcall for uid %u result %d\n", 464 cred->cr_uid, err); 465 return err; 466} 467 468static ssize_t 469gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 470 char __user *dst, size_t buflen) 471{ 472 char *data = (char *)msg->data + msg->copied; 473 ssize_t mlen = msg->len; 474 ssize_t left; 475 476 if (mlen > buflen) 477 mlen = buflen; 478 left = copy_to_user(dst, data, mlen); 479 if (left < 0) { 480 msg->errno = left; 481 return left; 482 } 483 mlen -= left; 484 msg->copied += mlen; 485 msg->errno = 0; 486 return mlen; 487} 488 489#define MSG_BUF_MAXSIZE 1024 490 491static ssize_t 492gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 493{ 494 const void *p, *end; 495 void *buf; 496 struct rpc_clnt *clnt; 497 struct gss_upcall_msg *gss_msg; 498 struct inode *inode = filp->f_path.dentry->d_inode; 499 struct gss_cl_ctx *ctx; 500 uid_t uid; 501 ssize_t err = -EFBIG; 502 503 if (mlen > MSG_BUF_MAXSIZE) 504 goto out; 505 err = -ENOMEM; 506 buf = kmalloc(mlen, GFP_KERNEL); 507 if (!buf) 508 goto out; 509 510 clnt = RPC_I(inode)->private; 511 err = -EFAULT; 512 if (copy_from_user(buf, src, mlen)) 513 goto err; 514 515 end = (const void *)((char *)buf + mlen); 516 p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 517 if (IS_ERR(p)) { 518 err = PTR_ERR(p); 519 goto err; 520 } 521 522 err = -ENOMEM; 523 ctx = gss_alloc_context(); 524 if (ctx == NULL) 525 goto err; 526 527 err = -ENOENT; 528 /* Find a matching upcall */ 529 spin_lock(&inode->i_lock); 530 gss_msg = __gss_find_upcall(RPC_I(inode), uid); 531 if (gss_msg == NULL) { 532 spin_unlock(&inode->i_lock); 533 goto err_put_ctx; 534 } 535 list_del_init(&gss_msg->list); 536 spin_unlock(&inode->i_lock); 537 538 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 539 if (IS_ERR(p)) { 540 err = PTR_ERR(p); 541 gss_msg->msg.errno = (err == -EACCES) ? -EACCES : -EAGAIN; 542 goto err_release_msg; 543 } 544 gss_msg->ctx = gss_get_ctx(ctx); 545 err = mlen; 546 547err_release_msg: 548 spin_lock(&inode->i_lock); 549 __gss_unhash_msg(gss_msg); 550 spin_unlock(&inode->i_lock); 551 gss_release_msg(gss_msg); 552err_put_ctx: 553 gss_put_ctx(ctx); 554err: 555 kfree(buf); 556out: 557 dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 558 return err; 559} 560 561static void 562gss_pipe_release(struct inode *inode) 563{ 564 struct rpc_inode *rpci = RPC_I(inode); 565 struct gss_upcall_msg *gss_msg; 566 567 spin_lock(&inode->i_lock); 568 while (!list_empty(&rpci->in_downcall)) { 569 570 gss_msg = list_entry(rpci->in_downcall.next, 571 struct gss_upcall_msg, list); 572 gss_msg->msg.errno = -EPIPE; 573 atomic_inc(&gss_msg->count); 574 __gss_unhash_msg(gss_msg); 575 spin_unlock(&inode->i_lock); 576 gss_release_msg(gss_msg); 577 spin_lock(&inode->i_lock); 578 } 579 spin_unlock(&inode->i_lock); 580} 581 582static void 583gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 584{ 585 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 586 static unsigned long ratelimit; 587 588 if (msg->errno < 0) { 589 dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 590 gss_msg); 591 atomic_inc(&gss_msg->count); 592 gss_unhash_msg(gss_msg); 593 if (msg->errno == -ETIMEDOUT) { 594 unsigned long now = jiffies; 595 if (time_after(now, ratelimit)) { 596 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 597 "Please check user daemon is running!\n"); 598 ratelimit = now + 15*HZ; 599 } 600 } 601 gss_release_msg(gss_msg); 602 } 603} 604 605/* 606 * NOTE: we have the opportunity to use different 607 * parameters based on the input flavor (which must be a pseudoflavor) 608 */ 609static struct rpc_auth * 610gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 611{ 612 struct gss_auth *gss_auth; 613 struct rpc_auth * auth; 614 int err = -ENOMEM; /* XXX? */ 615 616 dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 617 618 if (!try_module_get(THIS_MODULE)) 619 return ERR_PTR(err); 620 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 621 goto out_dec; 622 gss_auth->client = clnt; 623 err = -EINVAL; 624 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 625 if (!gss_auth->mech) { 626 printk(KERN_WARNING "%s: Pseudoflavor %d not found!", 627 __FUNCTION__, flavor); 628 goto err_free; 629 } 630 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 631 if (gss_auth->service == 0) 632 goto err_put_mech; 633 auth = &gss_auth->rpc_auth; 634 auth->au_cslack = GSS_CRED_SLACK >> 2; 635 auth->au_rslack = GSS_VERF_SLACK >> 2; 636 auth->au_ops = &authgss_ops; 637 auth->au_flavor = flavor; 638 atomic_set(&auth->au_count, 1); 639 640 gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, 641 clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 642 if (IS_ERR(gss_auth->dentry)) { 643 err = PTR_ERR(gss_auth->dentry); 644 goto err_put_mech; 645 } 646 647 err = rpcauth_init_credcache(auth); 648 if (err) 649 goto err_unlink_pipe; 650 651 return auth; 652err_unlink_pipe: 653 rpc_unlink(gss_auth->dentry); 654err_put_mech: 655 gss_mech_put(gss_auth->mech); 656err_free: 657 kfree(gss_auth); 658out_dec: 659 module_put(THIS_MODULE); 660 return ERR_PTR(err); 661} 662 663static void 664gss_destroy(struct rpc_auth *auth) 665{ 666 struct gss_auth *gss_auth; 667 668 dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 669 auth, auth->au_flavor); 670 671 rpcauth_destroy_credcache(auth); 672 673 gss_auth = container_of(auth, struct gss_auth, rpc_auth); 674 rpc_unlink(gss_auth->dentry); 675 gss_auth->dentry = NULL; 676 gss_mech_put(gss_auth->mech); 677 678 kfree(gss_auth); 679 module_put(THIS_MODULE); 680} 681 682/* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure 683 * to create a new cred or context, so they check that things have been 684 * allocated before freeing them. */ 685static void 686gss_do_free_ctx(struct gss_cl_ctx *ctx) 687{ 688 dprintk("RPC: gss_free_ctx\n"); 689 690 if (ctx->gc_gss_ctx) 691 gss_delete_sec_context(&ctx->gc_gss_ctx); 692 693 kfree(ctx->gc_wire_ctx.data); 694 kfree(ctx); 695} 696 697static void 698gss_free_ctx_callback(struct rcu_head *head) 699{ 700 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 701 gss_do_free_ctx(ctx); 702} 703 704static void 705gss_free_ctx(struct gss_cl_ctx *ctx) 706{ 707 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 708} 709 710static void 711gss_free_cred(struct gss_cred *gss_cred) 712{ 713 dprintk("RPC: gss_free_cred %p\n", gss_cred); 714 kfree(gss_cred); 715} 716 717static void 718gss_free_cred_callback(struct rcu_head *head) 719{ 720 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 721 gss_free_cred(gss_cred); 722} 723 724static void 725gss_destroy_cred(struct rpc_cred *cred) 726{ 727 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 728 struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 729 730 rcu_assign_pointer(gss_cred->gc_ctx, NULL); 731 call_rcu(&cred->cr_rcu, gss_free_cred_callback); 732 if (ctx) 733 gss_put_ctx(ctx); 734} 735 736/* 737 * Lookup RPCSEC_GSS cred for the current process 738 */ 739static struct rpc_cred * 740gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 741{ 742 return rpcauth_lookup_credcache(auth, acred, flags); 743} 744 745static struct rpc_cred * 746gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 747{ 748 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 749 struct gss_cred *cred = NULL; 750 int err = -ENOMEM; 751 752 dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 753 acred->uid, auth->au_flavor); 754 755 if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL))) 756 goto out_err; 757 758 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 759 /* 760 * Note: in order to force a call to call_refresh(), we deliberately 761 * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 762 */ 763 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 764 cred->gc_service = gss_auth->service; 765 return &cred->gc_base; 766 767out_err: 768 dprintk("RPC: gss_create_cred failed with error %d\n", err); 769 return ERR_PTR(err); 770} 771 772static int 773gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 774{ 775 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 776 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 777 int err; 778 779 do { 780 err = gss_create_upcall(gss_auth, gss_cred); 781 } while (err == -EAGAIN); 782 return err; 783} 784 785static int 786gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 787{ 788 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 789 790 /* 791 * If the searchflags have set RPCAUTH_LOOKUP_NEW, then 792 * we don't really care if the credential has expired or not, 793 * since the caller should be prepared to reinitialise it. 794 */ 795 if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 796 goto out; 797 /* Don't match with creds that have expired. */ 798 if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 799 return 0; 800out: 801 return (rc->cr_uid == acred->uid); 802} 803 804/* 805* Marshal credentials. 806* Maybe we should keep a cached credential for performance reasons. 807*/ 808static __be32 * 809gss_marshal(struct rpc_task *task, __be32 *p) 810{ 811 struct rpc_cred *cred = task->tk_msg.rpc_cred; 812 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 813 gc_base); 814 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 815 __be32 *cred_len; 816 struct rpc_rqst *req = task->tk_rqstp; 817 u32 maj_stat = 0; 818 struct xdr_netobj mic; 819 struct kvec iov; 820 struct xdr_buf verf_buf; 821 822 dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 823 824 *p++ = htonl(RPC_AUTH_GSS); 825 cred_len = p++; 826 827 spin_lock(&ctx->gc_seq_lock); 828 req->rq_seqno = ctx->gc_seq++; 829 spin_unlock(&ctx->gc_seq_lock); 830 831 *p++ = htonl((u32) RPC_GSS_VERSION); 832 *p++ = htonl((u32) ctx->gc_proc); 833 *p++ = htonl((u32) req->rq_seqno); 834 *p++ = htonl((u32) gss_cred->gc_service); 835 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 836 *cred_len = htonl((p - (cred_len + 1)) << 2); 837 838 /* We compute the checksum for the verifier over the xdr-encoded bytes 839 * starting with the xid and ending at the end of the credential: */ 840 iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 841 req->rq_snd_buf.head[0].iov_base); 842 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 843 xdr_buf_from_iov(&iov, &verf_buf); 844 845 /* set verifier flavor*/ 846 *p++ = htonl(RPC_AUTH_GSS); 847 848 mic.data = (u8 *)(p + 1); 849 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 850 if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 851 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 852 } else if (maj_stat != 0) { 853 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 854 goto out_put_ctx; 855 } 856 p = xdr_encode_opaque(p, NULL, mic.len); 857 gss_put_ctx(ctx); 858 return p; 859out_put_ctx: 860 gss_put_ctx(ctx); 861 return NULL; 862} 863 864/* 865* Refresh credentials. XXX - finish 866*/ 867static int 868gss_refresh(struct rpc_task *task) 869{ 870 871 if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) 872 return gss_refresh_upcall(task); 873 return 0; 874} 875 876static __be32 * 877gss_validate(struct rpc_task *task, __be32 *p) 878{ 879 struct rpc_cred *cred = task->tk_msg.rpc_cred; 880 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 881 __be32 seq; 882 struct kvec iov; 883 struct xdr_buf verf_buf; 884 struct xdr_netobj mic; 885 u32 flav,len; 886 u32 maj_stat; 887 888 dprintk("RPC: %5u gss_validate\n", task->tk_pid); 889 890 flav = ntohl(*p++); 891 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 892 goto out_bad; 893 if (flav != RPC_AUTH_GSS) 894 goto out_bad; 895 seq = htonl(task->tk_rqstp->rq_seqno); 896 iov.iov_base = &seq; 897 iov.iov_len = sizeof(seq); 898 xdr_buf_from_iov(&iov, &verf_buf); 899 mic.data = (u8 *)p; 900 mic.len = len; 901 902 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 903 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 904 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 905 if (maj_stat) 906 goto out_bad; 907 /* We leave it to unwrap to calculate au_rslack. For now we just 908 * calculate the length of the verifier: */ 909 task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2; 910 gss_put_ctx(ctx); 911 dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 912 task->tk_pid); 913 return p + XDR_QUADLEN(len); 914out_bad: 915 gss_put_ctx(ctx); 916 dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 917 return NULL; 918} 919 920static inline int 921gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 922 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 923{ 924 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 925 struct xdr_buf integ_buf; 926 __be32 *integ_len = NULL; 927 struct xdr_netobj mic; 928 u32 offset; 929 __be32 *q; 930 struct kvec *iov; 931 u32 maj_stat = 0; 932 int status = -EIO; 933 934 integ_len = p++; 935 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 936 *p++ = htonl(rqstp->rq_seqno); 937 938 status = encode(rqstp, p, obj); 939 if (status) 940 return status; 941 942 if (xdr_buf_subsegment(snd_buf, &integ_buf, 943 offset, snd_buf->len - offset)) 944 return status; 945 *integ_len = htonl(integ_buf.len); 946 947 /* guess whether we're in the head or the tail: */ 948 if (snd_buf->page_len || snd_buf->tail[0].iov_len) 949 iov = snd_buf->tail; 950 else 951 iov = snd_buf->head; 952 p = iov->iov_base + iov->iov_len; 953 mic.data = (u8 *)(p + 1); 954 955 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 956 status = -EIO; /* XXX? */ 957 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 958 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 959 else if (maj_stat) 960 return status; 961 q = xdr_encode_opaque(p, NULL, mic.len); 962 963 offset = (u8 *)q - (u8 *)p; 964 iov->iov_len += offset; 965 snd_buf->len += offset; 966 return 0; 967} 968 969static void 970priv_release_snd_buf(struct rpc_rqst *rqstp) 971{ 972 int i; 973 974 for (i=0; i < rqstp->rq_enc_pages_num; i++) 975 __free_page(rqstp->rq_enc_pages[i]); 976 kfree(rqstp->rq_enc_pages); 977} 978 979static int 980alloc_enc_pages(struct rpc_rqst *rqstp) 981{ 982 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 983 int first, last, i; 984 985 if (snd_buf->page_len == 0) { 986 rqstp->rq_enc_pages_num = 0; 987 return 0; 988 } 989 990 first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 991 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 992 rqstp->rq_enc_pages_num = last - first + 1 + 1; 993 rqstp->rq_enc_pages 994 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 995 GFP_NOFS); 996 if (!rqstp->rq_enc_pages) 997 goto out; 998 for (i=0; i < rqstp->rq_enc_pages_num; i++) { 999 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 1000 if (rqstp->rq_enc_pages[i] == NULL) 1001 goto out_free; 1002 } 1003 rqstp->rq_release_snd_buf = priv_release_snd_buf; 1004 return 0; 1005out_free: 1006 for (i--; i >= 0; i--) { 1007 __free_page(rqstp->rq_enc_pages[i]); 1008 } 1009out: 1010 return -EAGAIN; 1011} 1012 1013static inline int 1014gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1015 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 1016{ 1017 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 1018 u32 offset; 1019 u32 maj_stat; 1020 int status; 1021 __be32 *opaque_len; 1022 struct page **inpages; 1023 int first; 1024 int pad; 1025 struct kvec *iov; 1026 char *tmp; 1027 1028 opaque_len = p++; 1029 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 1030 *p++ = htonl(rqstp->rq_seqno); 1031 1032 status = encode(rqstp, p, obj); 1033 if (status) 1034 return status; 1035 1036 status = alloc_enc_pages(rqstp); 1037 if (status) 1038 return status; 1039 first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 1040 inpages = snd_buf->pages + first; 1041 snd_buf->pages = rqstp->rq_enc_pages; 1042 snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 1043 /* Give the tail its own page, in case we need extra space in the 1044 * head when wrapping: */ 1045 if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 1046 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 1047 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 1048 snd_buf->tail[0].iov_base = tmp; 1049 } 1050 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 1051 /* RPC_SLACK_SPACE should prevent this ever happening: */ 1052 BUG_ON(snd_buf->len > snd_buf->buflen); 1053 status = -EIO; 1054 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 1055 * done anyway, so it's safe to put the request on the wire: */ 1056 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1057 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1058 else if (maj_stat) 1059 return status; 1060 1061 *opaque_len = htonl(snd_buf->len - offset); 1062 /* guess whether we're in the head or the tail: */ 1063 if (snd_buf->page_len || snd_buf->tail[0].iov_len) 1064 iov = snd_buf->tail; 1065 else 1066 iov = snd_buf->head; 1067 p = iov->iov_base + iov->iov_len; 1068 pad = 3 - ((snd_buf->len - offset - 1) & 3); 1069 memset(p, 0, pad); 1070 iov->iov_len += pad; 1071 snd_buf->len += pad; 1072 1073 return 0; 1074} 1075 1076static int 1077gss_wrap_req(struct rpc_task *task, 1078 kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 1079{ 1080 struct rpc_cred *cred = task->tk_msg.rpc_cred; 1081 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 1082 gc_base); 1083 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1084 int status = -EIO; 1085 1086 dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 1087 if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 1088 /* The spec seems a little ambiguous here, but I think that not 1089 * wrapping context destruction requests makes the most sense. 1090 */ 1091 status = encode(rqstp, p, obj); 1092 goto out; 1093 } 1094 switch (gss_cred->gc_service) { 1095 case RPC_GSS_SVC_NONE: 1096 status = encode(rqstp, p, obj); 1097 break; 1098 case RPC_GSS_SVC_INTEGRITY: 1099 status = gss_wrap_req_integ(cred, ctx, encode, 1100 rqstp, p, obj); 1101 break; 1102 case RPC_GSS_SVC_PRIVACY: 1103 status = gss_wrap_req_priv(cred, ctx, encode, 1104 rqstp, p, obj); 1105 break; 1106 } 1107out: 1108 gss_put_ctx(ctx); 1109 dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 1110 return status; 1111} 1112 1113static inline int 1114gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1115 struct rpc_rqst *rqstp, __be32 **p) 1116{ 1117 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 1118 struct xdr_buf integ_buf; 1119 struct xdr_netobj mic; 1120 u32 data_offset, mic_offset; 1121 u32 integ_len; 1122 u32 maj_stat; 1123 int status = -EIO; 1124 1125 integ_len = ntohl(*(*p)++); 1126 if (integ_len & 3) 1127 return status; 1128 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 1129 mic_offset = integ_len + data_offset; 1130 if (mic_offset > rcv_buf->len) 1131 return status; 1132 if (ntohl(*(*p)++) != rqstp->rq_seqno) 1133 return status; 1134 1135 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 1136 mic_offset - data_offset)) 1137 return status; 1138 1139 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 1140 return status; 1141 1142 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 1143 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1144 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1145 if (maj_stat != GSS_S_COMPLETE) 1146 return status; 1147 return 0; 1148} 1149 1150static inline int 1151gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1152 struct rpc_rqst *rqstp, __be32 **p) 1153{ 1154 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 1155 u32 offset; 1156 u32 opaque_len; 1157 u32 maj_stat; 1158 int status = -EIO; 1159 1160 opaque_len = ntohl(*(*p)++); 1161 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 1162 if (offset + opaque_len > rcv_buf->len) 1163 return status; 1164 /* remove padding: */ 1165 rcv_buf->len = offset + opaque_len; 1166 1167 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 1168 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1169 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1170 if (maj_stat != GSS_S_COMPLETE) 1171 return status; 1172 if (ntohl(*(*p)++) != rqstp->rq_seqno) 1173 return status; 1174 1175 return 0; 1176} 1177 1178 1179static int 1180gss_unwrap_resp(struct rpc_task *task, 1181 kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 1182{ 1183 struct rpc_cred *cred = task->tk_msg.rpc_cred; 1184 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 1185 gc_base); 1186 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1187 __be32 *savedp = p; 1188 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 1189 int savedlen = head->iov_len; 1190 int status = -EIO; 1191 1192 if (ctx->gc_proc != RPC_GSS_PROC_DATA) 1193 goto out_decode; 1194 switch (gss_cred->gc_service) { 1195 case RPC_GSS_SVC_NONE: 1196 break; 1197 case RPC_GSS_SVC_INTEGRITY: 1198 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 1199 if (status) 1200 goto out; 1201 break; 1202 case RPC_GSS_SVC_PRIVACY: 1203 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 1204 if (status) 1205 goto out; 1206 break; 1207 } 1208 /* take into account extra slack for integrity and privacy cases: */ 1209 task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp) 1210 + (savedlen - head->iov_len); 1211out_decode: 1212 status = decode(rqstp, p, obj); 1213out: 1214 gss_put_ctx(ctx); 1215 dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 1216 status); 1217 return status; 1218} 1219 1220static const struct rpc_authops authgss_ops = { 1221 .owner = THIS_MODULE, 1222 .au_flavor = RPC_AUTH_GSS, 1223#ifdef RPC_DEBUG 1224 .au_name = "RPCSEC_GSS", 1225#endif 1226 .create = gss_create, 1227 .destroy = gss_destroy, 1228 .lookup_cred = gss_lookup_cred, 1229 .crcreate = gss_create_cred 1230}; 1231 1232static const struct rpc_credops gss_credops = { 1233 .cr_name = "AUTH_GSS", 1234 .crdestroy = gss_destroy_cred, 1235 .cr_init = gss_cred_init, 1236 .crmatch = gss_match, 1237 .crmarshal = gss_marshal, 1238 .crrefresh = gss_refresh, 1239 .crvalidate = gss_validate, 1240 .crwrap_req = gss_wrap_req, 1241 .crunwrap_resp = gss_unwrap_resp, 1242}; 1243 1244static struct rpc_pipe_ops gss_upcall_ops = { 1245 .upcall = gss_pipe_upcall, 1246 .downcall = gss_pipe_downcall, 1247 .destroy_msg = gss_pipe_destroy_msg, 1248 .release_pipe = gss_pipe_release, 1249}; 1250 1251/* 1252 * Initialize RPCSEC_GSS module 1253 */ 1254static int __init init_rpcsec_gss(void) 1255{ 1256 int err = 0; 1257 1258 err = rpcauth_register(&authgss_ops); 1259 if (err) 1260 goto out; 1261 err = gss_svc_init(); 1262 if (err) 1263 goto out_unregister; 1264 return 0; 1265out_unregister: 1266 rpcauth_unregister(&authgss_ops); 1267out: 1268 return err; 1269} 1270 1271static void __exit exit_rpcsec_gss(void) 1272{ 1273 gss_svc_shutdown(); 1274 rpcauth_unregister(&authgss_ops); 1275} 1276 1277MODULE_LICENSE("GPL"); 1278module_init(init_rpcsec_gss) 1279module_exit(exit_rpcsec_gss) 1280