auth_gss.c revision b03568c32226163cb3588ea8993adb268ed497a5
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 38 39#include <linux/module.h> 40#include <linux/init.h> 41#include <linux/types.h> 42#include <linux/slab.h> 43#include <linux/sched.h> 44#include <linux/pagemap.h> 45#include <linux/sunrpc/clnt.h> 46#include <linux/sunrpc/auth.h> 47#include <linux/sunrpc/auth_gss.h> 48#include <linux/sunrpc/svcauth_gss.h> 49#include <linux/sunrpc/gss_err.h> 50#include <linux/workqueue.h> 51#include <linux/sunrpc/rpc_pipe_fs.h> 52#include <linux/sunrpc/gss_api.h> 53#include <asm/uaccess.h> 54 55static const struct rpc_authops authgss_ops; 56 57static const struct rpc_credops gss_credops; 58static const struct rpc_credops gss_nullops; 59 60#ifdef RPC_DEBUG 61# define RPCDBG_FACILITY RPCDBG_AUTH 62#endif 63 64#define GSS_CRED_SLACK 1024 65/* length of a krb5 verifier (48), plus data added before arguments when 66 * using integrity (two 4-byte integers): */ 67#define GSS_VERF_SLACK 100 68 69struct gss_auth { 70 struct kref kref; 71 struct rpc_auth rpc_auth; 72 struct gss_api_mech *mech; 73 enum rpc_gss_svc service; 74 struct rpc_clnt *client; 75 struct dentry *dentry; 76}; 77 78static void gss_free_ctx(struct gss_cl_ctx *); 79static struct rpc_pipe_ops gss_upcall_ops; 80 81static inline struct gss_cl_ctx * 82gss_get_ctx(struct gss_cl_ctx *ctx) 83{ 84 atomic_inc(&ctx->count); 85 return ctx; 86} 87 88static inline void 89gss_put_ctx(struct gss_cl_ctx *ctx) 90{ 91 if (atomic_dec_and_test(&ctx->count)) 92 gss_free_ctx(ctx); 93} 94 95/* gss_cred_set_ctx: 96 * called by gss_upcall_callback and gss_create_upcall in order 97 * to set the gss context. The actual exchange of an old context 98 * and a new one is protected by the inode->i_lock. 99 */ 100static void 101gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 102{ 103 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 104 105 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 106 return; 107 gss_get_ctx(ctx); 108 rcu_assign_pointer(gss_cred->gc_ctx, ctx); 109 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 110 smp_mb__before_clear_bit(); 111 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 112} 113 114static const void * 115simple_get_bytes(const void *p, const void *end, void *res, size_t len) 116{ 117 const void *q = (const void *)((const char *)p + len); 118 if (unlikely(q > end || q < p)) 119 return ERR_PTR(-EFAULT); 120 memcpy(res, p, len); 121 return q; 122} 123 124static inline const void * 125simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 126{ 127 const void *q; 128 unsigned int len; 129 130 p = simple_get_bytes(p, end, &len, sizeof(len)); 131 if (IS_ERR(p)) 132 return p; 133 q = (const void *)((const char *)p + len); 134 if (unlikely(q > end || q < p)) 135 return ERR_PTR(-EFAULT); 136 dest->data = kmemdup(p, len, GFP_NOFS); 137 if (unlikely(dest->data == NULL)) 138 return ERR_PTR(-ENOMEM); 139 dest->len = len; 140 return q; 141} 142 143static struct gss_cl_ctx * 144gss_cred_get_ctx(struct rpc_cred *cred) 145{ 146 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 147 struct gss_cl_ctx *ctx = NULL; 148 149 rcu_read_lock(); 150 if (gss_cred->gc_ctx) 151 ctx = gss_get_ctx(gss_cred->gc_ctx); 152 rcu_read_unlock(); 153 return ctx; 154} 155 156static struct gss_cl_ctx * 157gss_alloc_context(void) 158{ 159 struct gss_cl_ctx *ctx; 160 161 ctx = kzalloc(sizeof(*ctx), GFP_NOFS); 162 if (ctx != NULL) { 163 ctx->gc_proc = RPC_GSS_PROC_DATA; 164 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 165 spin_lock_init(&ctx->gc_seq_lock); 166 atomic_set(&ctx->count,1); 167 } 168 return ctx; 169} 170 171#define GSSD_MIN_TIMEOUT (60 * 60) 172static const void * 173gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 174{ 175 const void *q; 176 unsigned int seclen; 177 unsigned int timeout; 178 u32 window_size; 179 int ret; 180 181 /* First unsigned int gives the lifetime (in seconds) of the cred */ 182 p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 183 if (IS_ERR(p)) 184 goto err; 185 if (timeout == 0) 186 timeout = GSSD_MIN_TIMEOUT; 187 ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 188 /* Sequence number window. Determines the maximum number of simultaneous requests */ 189 p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 190 if (IS_ERR(p)) 191 goto err; 192 ctx->gc_win = window_size; 193 /* gssd signals an error by passing ctx->gc_win = 0: */ 194 if (ctx->gc_win == 0) { 195 /* in which case, p points to an error code which we ignore */ 196 p = ERR_PTR(-EACCES); 197 goto err; 198 } 199 /* copy the opaque wire context */ 200 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 201 if (IS_ERR(p)) 202 goto err; 203 /* import the opaque security context */ 204 p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 205 if (IS_ERR(p)) 206 goto err; 207 q = (const void *)((const char *)p + seclen); 208 if (unlikely(q > end || q < p)) { 209 p = ERR_PTR(-EFAULT); 210 goto err; 211 } 212 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 213 if (ret < 0) { 214 p = ERR_PTR(ret); 215 goto err; 216 } 217 return q; 218err: 219 dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 220 return p; 221} 222 223 224struct gss_upcall_msg { 225 atomic_t count; 226 uid_t uid; 227 struct rpc_pipe_msg msg; 228 struct list_head list; 229 struct gss_auth *auth; 230 struct rpc_wait_queue rpc_waitqueue; 231 wait_queue_head_t waitqueue; 232 struct gss_cl_ctx *ctx; 233}; 234 235static void 236gss_release_msg(struct gss_upcall_msg *gss_msg) 237{ 238 if (!atomic_dec_and_test(&gss_msg->count)) 239 return; 240 BUG_ON(!list_empty(&gss_msg->list)); 241 if (gss_msg->ctx != NULL) 242 gss_put_ctx(gss_msg->ctx); 243 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 244 kfree(gss_msg); 245} 246 247static struct gss_upcall_msg * 248__gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 249{ 250 struct gss_upcall_msg *pos; 251 list_for_each_entry(pos, &rpci->in_downcall, list) { 252 if (pos->uid != uid) 253 continue; 254 atomic_inc(&pos->count); 255 dprintk("RPC: gss_find_upcall found msg %p\n", pos); 256 return pos; 257 } 258 dprintk("RPC: gss_find_upcall found nothing\n"); 259 return NULL; 260} 261 262/* Try to add an upcall to the pipefs queue. 263 * If an upcall owned by our uid already exists, then we return a reference 264 * to that upcall instead of adding the new upcall. 265 */ 266static inline struct gss_upcall_msg * 267gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) 268{ 269 struct inode *inode = gss_auth->dentry->d_inode; 270 struct rpc_inode *rpci = RPC_I(inode); 271 struct gss_upcall_msg *old; 272 273 spin_lock(&inode->i_lock); 274 old = __gss_find_upcall(rpci, gss_msg->uid); 275 if (old == NULL) { 276 atomic_inc(&gss_msg->count); 277 list_add(&gss_msg->list, &rpci->in_downcall); 278 } else 279 gss_msg = old; 280 spin_unlock(&inode->i_lock); 281 return gss_msg; 282} 283 284static void 285__gss_unhash_msg(struct gss_upcall_msg *gss_msg) 286{ 287 list_del_init(&gss_msg->list); 288 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 289 wake_up_all(&gss_msg->waitqueue); 290 atomic_dec(&gss_msg->count); 291} 292 293static void 294gss_unhash_msg(struct gss_upcall_msg *gss_msg) 295{ 296 struct gss_auth *gss_auth = gss_msg->auth; 297 struct inode *inode = gss_auth->dentry->d_inode; 298 299 if (list_empty(&gss_msg->list)) 300 return; 301 spin_lock(&inode->i_lock); 302 if (!list_empty(&gss_msg->list)) 303 __gss_unhash_msg(gss_msg); 304 spin_unlock(&inode->i_lock); 305} 306 307static void 308gss_upcall_callback(struct rpc_task *task) 309{ 310 struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 311 struct gss_cred, gc_base); 312 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 313 struct inode *inode = gss_msg->auth->dentry->d_inode; 314 315 spin_lock(&inode->i_lock); 316 if (gss_msg->ctx) 317 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 318 else 319 task->tk_status = gss_msg->msg.errno; 320 gss_cred->gc_upcall = NULL; 321 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 322 spin_unlock(&inode->i_lock); 323 gss_release_msg(gss_msg); 324} 325 326static inline struct gss_upcall_msg * 327gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) 328{ 329 struct gss_upcall_msg *gss_msg; 330 331 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 332 if (gss_msg != NULL) { 333 INIT_LIST_HEAD(&gss_msg->list); 334 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 335 init_waitqueue_head(&gss_msg->waitqueue); 336 atomic_set(&gss_msg->count, 1); 337 gss_msg->msg.data = &gss_msg->uid; 338 gss_msg->msg.len = sizeof(gss_msg->uid); 339 gss_msg->uid = uid; 340 gss_msg->auth = gss_auth; 341 } 342 return gss_msg; 343} 344 345static struct gss_upcall_msg * 346gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 347{ 348 struct gss_cred *gss_cred = container_of(cred, 349 struct gss_cred, gc_base); 350 struct gss_upcall_msg *gss_new, *gss_msg; 351 uid_t uid = cred->cr_uid; 352 353 /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */ 354 if (gss_cred->gc_machine_cred != 0) 355 uid = 0; 356 357 gss_new = gss_alloc_msg(gss_auth, uid); 358 if (gss_new == NULL) 359 return ERR_PTR(-ENOMEM); 360 gss_msg = gss_add_msg(gss_auth, gss_new); 361 if (gss_msg == gss_new) { 362 int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); 363 if (res) { 364 gss_unhash_msg(gss_new); 365 gss_msg = ERR_PTR(res); 366 } 367 } else 368 gss_release_msg(gss_new); 369 return gss_msg; 370} 371 372static void warn_gssd(void) 373{ 374 static unsigned long ratelimit; 375 unsigned long now = jiffies; 376 377 if (time_after(now, ratelimit)) { 378 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 379 "Please check user daemon is running.\n"); 380 ratelimit = now + 15*HZ; 381 } 382} 383 384static inline int 385gss_refresh_upcall(struct rpc_task *task) 386{ 387 struct rpc_cred *cred = task->tk_msg.rpc_cred; 388 struct gss_auth *gss_auth = container_of(cred->cr_auth, 389 struct gss_auth, rpc_auth); 390 struct gss_cred *gss_cred = container_of(cred, 391 struct gss_cred, gc_base); 392 struct gss_upcall_msg *gss_msg; 393 struct inode *inode = gss_auth->dentry->d_inode; 394 int err = 0; 395 396 dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 397 cred->cr_uid); 398 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 399 if (IS_ERR(gss_msg)) { 400 err = PTR_ERR(gss_msg); 401 goto out; 402 } 403 spin_lock(&inode->i_lock); 404 if (gss_cred->gc_upcall != NULL) 405 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 406 else if (gss_msg->ctx != NULL) { 407 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 408 gss_cred->gc_upcall = NULL; 409 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 410 } else if (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); 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_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 size_t mlen = min(msg->len, buflen); 474 unsigned long left; 475 476 left = copy_to_user(dst, data, mlen); 477 if (left == mlen) { 478 msg->errno = -EFAULT; 479 return -EFAULT; 480 } 481 482 mlen -= left; 483 msg->copied += mlen; 484 msg->errno = 0; 485 return mlen; 486} 487 488#define MSG_BUF_MAXSIZE 1024 489 490static ssize_t 491gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 492{ 493 const void *p, *end; 494 void *buf; 495 struct gss_upcall_msg *gss_msg; 496 struct inode *inode = filp->f_path.dentry->d_inode; 497 struct gss_cl_ctx *ctx; 498 uid_t uid; 499 ssize_t err = -EFBIG; 500 501 if (mlen > MSG_BUF_MAXSIZE) 502 goto out; 503 err = -ENOMEM; 504 buf = kmalloc(mlen, GFP_NOFS); 505 if (!buf) 506 goto out; 507 508 err = -EFAULT; 509 if (copy_from_user(buf, src, mlen)) 510 goto err; 511 512 end = (const void *)((char *)buf + mlen); 513 p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 514 if (IS_ERR(p)) { 515 err = PTR_ERR(p); 516 goto err; 517 } 518 519 err = -ENOMEM; 520 ctx = gss_alloc_context(); 521 if (ctx == NULL) 522 goto err; 523 524 err = -ENOENT; 525 /* Find a matching upcall */ 526 spin_lock(&inode->i_lock); 527 gss_msg = __gss_find_upcall(RPC_I(inode), uid); 528 if (gss_msg == NULL) { 529 spin_unlock(&inode->i_lock); 530 goto err_put_ctx; 531 } 532 list_del_init(&gss_msg->list); 533 spin_unlock(&inode->i_lock); 534 535 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 536 if (IS_ERR(p)) { 537 err = PTR_ERR(p); 538 gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES; 539 goto err_release_msg; 540 } 541 gss_msg->ctx = gss_get_ctx(ctx); 542 err = mlen; 543 544err_release_msg: 545 spin_lock(&inode->i_lock); 546 __gss_unhash_msg(gss_msg); 547 spin_unlock(&inode->i_lock); 548 gss_release_msg(gss_msg); 549err_put_ctx: 550 gss_put_ctx(ctx); 551err: 552 kfree(buf); 553out: 554 dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 555 return err; 556} 557 558static void 559gss_pipe_release(struct inode *inode) 560{ 561 struct rpc_inode *rpci = RPC_I(inode); 562 struct gss_upcall_msg *gss_msg; 563 564 spin_lock(&inode->i_lock); 565 while (!list_empty(&rpci->in_downcall)) { 566 567 gss_msg = list_entry(rpci->in_downcall.next, 568 struct gss_upcall_msg, list); 569 gss_msg->msg.errno = -EPIPE; 570 atomic_inc(&gss_msg->count); 571 __gss_unhash_msg(gss_msg); 572 spin_unlock(&inode->i_lock); 573 gss_release_msg(gss_msg); 574 spin_lock(&inode->i_lock); 575 } 576 spin_unlock(&inode->i_lock); 577} 578 579static void 580gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 581{ 582 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 583 584 if (msg->errno < 0) { 585 dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 586 gss_msg); 587 atomic_inc(&gss_msg->count); 588 gss_unhash_msg(gss_msg); 589 if (msg->errno == -ETIMEDOUT) 590 warn_gssd(); 591 gss_release_msg(gss_msg); 592 } 593} 594 595/* 596 * NOTE: we have the opportunity to use different 597 * parameters based on the input flavor (which must be a pseudoflavor) 598 */ 599static struct rpc_auth * 600gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 601{ 602 struct gss_auth *gss_auth; 603 struct rpc_auth * auth; 604 int err = -ENOMEM; /* XXX? */ 605 606 dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 607 608 if (!try_module_get(THIS_MODULE)) 609 return ERR_PTR(err); 610 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 611 goto out_dec; 612 gss_auth->client = clnt; 613 err = -EINVAL; 614 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 615 if (!gss_auth->mech) { 616 printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", 617 __func__, flavor); 618 goto err_free; 619 } 620 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 621 if (gss_auth->service == 0) 622 goto err_put_mech; 623 auth = &gss_auth->rpc_auth; 624 auth->au_cslack = GSS_CRED_SLACK >> 2; 625 auth->au_rslack = GSS_VERF_SLACK >> 2; 626 auth->au_ops = &authgss_ops; 627 auth->au_flavor = flavor; 628 atomic_set(&auth->au_count, 1); 629 kref_init(&gss_auth->kref); 630 631 gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, 632 clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 633 if (IS_ERR(gss_auth->dentry)) { 634 err = PTR_ERR(gss_auth->dentry); 635 goto err_put_mech; 636 } 637 638 err = rpcauth_init_credcache(auth); 639 if (err) 640 goto err_unlink_pipe; 641 642 return auth; 643err_unlink_pipe: 644 rpc_unlink(gss_auth->dentry); 645err_put_mech: 646 gss_mech_put(gss_auth->mech); 647err_free: 648 kfree(gss_auth); 649out_dec: 650 module_put(THIS_MODULE); 651 return ERR_PTR(err); 652} 653 654static void 655gss_free(struct gss_auth *gss_auth) 656{ 657 rpc_unlink(gss_auth->dentry); 658 gss_mech_put(gss_auth->mech); 659 660 kfree(gss_auth); 661 module_put(THIS_MODULE); 662} 663 664static void 665gss_free_callback(struct kref *kref) 666{ 667 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 668 669 gss_free(gss_auth); 670} 671 672static void 673gss_destroy(struct rpc_auth *auth) 674{ 675 struct gss_auth *gss_auth; 676 677 dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 678 auth, auth->au_flavor); 679 680 rpcauth_destroy_credcache(auth); 681 682 gss_auth = container_of(auth, struct gss_auth, rpc_auth); 683 kref_put(&gss_auth->kref, gss_free_callback); 684} 685 686/* 687 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 688 * to the server with the GSS control procedure field set to 689 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 690 * all RPCSEC_GSS state associated with that context. 691 */ 692static int 693gss_destroying_context(struct rpc_cred *cred) 694{ 695 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 696 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 697 struct rpc_task *task; 698 699 if (gss_cred->gc_ctx == NULL || 700 test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 701 return 0; 702 703 gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 704 cred->cr_ops = &gss_nullops; 705 706 /* Take a reference to ensure the cred will be destroyed either 707 * by the RPC call or by the put_rpccred() below */ 708 get_rpccred(cred); 709 710 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 711 if (!IS_ERR(task)) 712 rpc_put_task(task); 713 714 put_rpccred(cred); 715 return 1; 716} 717 718/* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 719 * to create a new cred or context, so they check that things have been 720 * allocated before freeing them. */ 721static void 722gss_do_free_ctx(struct gss_cl_ctx *ctx) 723{ 724 dprintk("RPC: gss_free_ctx\n"); 725 726 kfree(ctx->gc_wire_ctx.data); 727 kfree(ctx); 728} 729 730static void 731gss_free_ctx_callback(struct rcu_head *head) 732{ 733 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 734 gss_do_free_ctx(ctx); 735} 736 737static void 738gss_free_ctx(struct gss_cl_ctx *ctx) 739{ 740 struct gss_ctx *gc_gss_ctx; 741 742 gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); 743 rcu_assign_pointer(ctx->gc_gss_ctx, NULL); 744 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 745 if (gc_gss_ctx) 746 gss_delete_sec_context(&gc_gss_ctx); 747} 748 749static void 750gss_free_cred(struct gss_cred *gss_cred) 751{ 752 dprintk("RPC: gss_free_cred %p\n", gss_cred); 753 kfree(gss_cred); 754} 755 756static void 757gss_free_cred_callback(struct rcu_head *head) 758{ 759 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 760 gss_free_cred(gss_cred); 761} 762 763static void 764gss_destroy_nullcred(struct rpc_cred *cred) 765{ 766 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 767 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 768 struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 769 770 rcu_assign_pointer(gss_cred->gc_ctx, NULL); 771 call_rcu(&cred->cr_rcu, gss_free_cred_callback); 772 if (ctx) 773 gss_put_ctx(ctx); 774 kref_put(&gss_auth->kref, gss_free_callback); 775} 776 777static void 778gss_destroy_cred(struct rpc_cred *cred) 779{ 780 781 if (gss_destroying_context(cred)) 782 return; 783 gss_destroy_nullcred(cred); 784} 785 786/* 787 * Lookup RPCSEC_GSS cred for the current process 788 */ 789static struct rpc_cred * 790gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 791{ 792 return rpcauth_lookup_credcache(auth, acred, flags); 793} 794 795static struct rpc_cred * 796gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 797{ 798 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 799 struct gss_cred *cred = NULL; 800 int err = -ENOMEM; 801 802 dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 803 acred->uid, auth->au_flavor); 804 805 if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 806 goto out_err; 807 808 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 809 /* 810 * Note: in order to force a call to call_refresh(), we deliberately 811 * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 812 */ 813 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 814 cred->gc_service = gss_auth->service; 815 cred->gc_machine_cred = acred->machine_cred; 816 kref_get(&gss_auth->kref); 817 return &cred->gc_base; 818 819out_err: 820 dprintk("RPC: gss_create_cred failed with error %d\n", err); 821 return ERR_PTR(err); 822} 823 824static int 825gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 826{ 827 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 828 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 829 int err; 830 831 do { 832 err = gss_create_upcall(gss_auth, gss_cred); 833 } while (err == -EAGAIN); 834 return err; 835} 836 837static int 838gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 839{ 840 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 841 842 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 843 goto out; 844 /* Don't match with creds that have expired. */ 845 if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 846 return 0; 847 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 848 return 0; 849out: 850 if (acred->machine_cred != gss_cred->gc_machine_cred) 851 return 0; 852 return (rc->cr_uid == acred->uid); 853} 854 855/* 856* Marshal credentials. 857* Maybe we should keep a cached credential for performance reasons. 858*/ 859static __be32 * 860gss_marshal(struct rpc_task *task, __be32 *p) 861{ 862 struct rpc_cred *cred = task->tk_msg.rpc_cred; 863 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 864 gc_base); 865 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 866 __be32 *cred_len; 867 struct rpc_rqst *req = task->tk_rqstp; 868 u32 maj_stat = 0; 869 struct xdr_netobj mic; 870 struct kvec iov; 871 struct xdr_buf verf_buf; 872 873 dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 874 875 *p++ = htonl(RPC_AUTH_GSS); 876 cred_len = p++; 877 878 spin_lock(&ctx->gc_seq_lock); 879 req->rq_seqno = ctx->gc_seq++; 880 spin_unlock(&ctx->gc_seq_lock); 881 882 *p++ = htonl((u32) RPC_GSS_VERSION); 883 *p++ = htonl((u32) ctx->gc_proc); 884 *p++ = htonl((u32) req->rq_seqno); 885 *p++ = htonl((u32) gss_cred->gc_service); 886 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 887 *cred_len = htonl((p - (cred_len + 1)) << 2); 888 889 /* We compute the checksum for the verifier over the xdr-encoded bytes 890 * starting with the xid and ending at the end of the credential: */ 891 iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 892 req->rq_snd_buf.head[0].iov_base); 893 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 894 xdr_buf_from_iov(&iov, &verf_buf); 895 896 /* set verifier flavor*/ 897 *p++ = htonl(RPC_AUTH_GSS); 898 899 mic.data = (u8 *)(p + 1); 900 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 901 if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 902 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 903 } else if (maj_stat != 0) { 904 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 905 goto out_put_ctx; 906 } 907 p = xdr_encode_opaque(p, NULL, mic.len); 908 gss_put_ctx(ctx); 909 return p; 910out_put_ctx: 911 gss_put_ctx(ctx); 912 return NULL; 913} 914 915static int gss_renew_cred(struct rpc_task *task) 916{ 917 struct rpc_cred *oldcred = task->tk_msg.rpc_cred; 918 struct gss_cred *gss_cred = container_of(oldcred, 919 struct gss_cred, 920 gc_base); 921 struct rpc_auth *auth = oldcred->cr_auth; 922 struct auth_cred acred = { 923 .uid = oldcred->cr_uid, 924 .machine_cred = gss_cred->gc_machine_cred, 925 }; 926 struct rpc_cred *new; 927 928 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 929 if (IS_ERR(new)) 930 return PTR_ERR(new); 931 task->tk_msg.rpc_cred = new; 932 put_rpccred(oldcred); 933 return 0; 934} 935 936/* 937* Refresh credentials. XXX - finish 938*/ 939static int 940gss_refresh(struct rpc_task *task) 941{ 942 struct rpc_cred *cred = task->tk_msg.rpc_cred; 943 int ret = 0; 944 945 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 946 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 947 ret = gss_renew_cred(task); 948 if (ret < 0) 949 goto out; 950 cred = task->tk_msg.rpc_cred; 951 } 952 953 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 954 ret = gss_refresh_upcall(task); 955out: 956 return ret; 957} 958 959/* Dummy refresh routine: used only when destroying the context */ 960static int 961gss_refresh_null(struct rpc_task *task) 962{ 963 return -EACCES; 964} 965 966static __be32 * 967gss_validate(struct rpc_task *task, __be32 *p) 968{ 969 struct rpc_cred *cred = task->tk_msg.rpc_cred; 970 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 971 __be32 seq; 972 struct kvec iov; 973 struct xdr_buf verf_buf; 974 struct xdr_netobj mic; 975 u32 flav,len; 976 u32 maj_stat; 977 978 dprintk("RPC: %5u gss_validate\n", task->tk_pid); 979 980 flav = ntohl(*p++); 981 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 982 goto out_bad; 983 if (flav != RPC_AUTH_GSS) 984 goto out_bad; 985 seq = htonl(task->tk_rqstp->rq_seqno); 986 iov.iov_base = &seq; 987 iov.iov_len = sizeof(seq); 988 xdr_buf_from_iov(&iov, &verf_buf); 989 mic.data = (u8 *)p; 990 mic.len = len; 991 992 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 993 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 994 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 995 if (maj_stat) { 996 dprintk("RPC: %5u gss_validate: gss_verify_mic returned " 997 "error 0x%08x\n", task->tk_pid, maj_stat); 998 goto out_bad; 999 } 1000 /* We leave it to unwrap to calculate au_rslack. For now we just 1001 * calculate the length of the verifier: */ 1002 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 1003 gss_put_ctx(ctx); 1004 dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 1005 task->tk_pid); 1006 return p + XDR_QUADLEN(len); 1007out_bad: 1008 gss_put_ctx(ctx); 1009 dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 1010 return NULL; 1011} 1012 1013static inline int 1014gss_wrap_req_integ(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 struct xdr_buf integ_buf; 1019 __be32 *integ_len = NULL; 1020 struct xdr_netobj mic; 1021 u32 offset; 1022 __be32 *q; 1023 struct kvec *iov; 1024 u32 maj_stat = 0; 1025 int status = -EIO; 1026 1027 integ_len = p++; 1028 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 1029 *p++ = htonl(rqstp->rq_seqno); 1030 1031 status = encode(rqstp, p, obj); 1032 if (status) 1033 return status; 1034 1035 if (xdr_buf_subsegment(snd_buf, &integ_buf, 1036 offset, snd_buf->len - offset)) 1037 return status; 1038 *integ_len = htonl(integ_buf.len); 1039 1040 /* guess whether we're in the head or the tail: */ 1041 if (snd_buf->page_len || snd_buf->tail[0].iov_len) 1042 iov = snd_buf->tail; 1043 else 1044 iov = snd_buf->head; 1045 p = iov->iov_base + iov->iov_len; 1046 mic.data = (u8 *)(p + 1); 1047 1048 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 1049 status = -EIO; /* XXX? */ 1050 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1051 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1052 else if (maj_stat) 1053 return status; 1054 q = xdr_encode_opaque(p, NULL, mic.len); 1055 1056 offset = (u8 *)q - (u8 *)p; 1057 iov->iov_len += offset; 1058 snd_buf->len += offset; 1059 return 0; 1060} 1061 1062static void 1063priv_release_snd_buf(struct rpc_rqst *rqstp) 1064{ 1065 int i; 1066 1067 for (i=0; i < rqstp->rq_enc_pages_num; i++) 1068 __free_page(rqstp->rq_enc_pages[i]); 1069 kfree(rqstp->rq_enc_pages); 1070} 1071 1072static int 1073alloc_enc_pages(struct rpc_rqst *rqstp) 1074{ 1075 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 1076 int first, last, i; 1077 1078 if (snd_buf->page_len == 0) { 1079 rqstp->rq_enc_pages_num = 0; 1080 return 0; 1081 } 1082 1083 first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 1084 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 1085 rqstp->rq_enc_pages_num = last - first + 1 + 1; 1086 rqstp->rq_enc_pages 1087 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 1088 GFP_NOFS); 1089 if (!rqstp->rq_enc_pages) 1090 goto out; 1091 for (i=0; i < rqstp->rq_enc_pages_num; i++) { 1092 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 1093 if (rqstp->rq_enc_pages[i] == NULL) 1094 goto out_free; 1095 } 1096 rqstp->rq_release_snd_buf = priv_release_snd_buf; 1097 return 0; 1098out_free: 1099 for (i--; i >= 0; i--) { 1100 __free_page(rqstp->rq_enc_pages[i]); 1101 } 1102out: 1103 return -EAGAIN; 1104} 1105 1106static inline int 1107gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1108 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 1109{ 1110 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 1111 u32 offset; 1112 u32 maj_stat; 1113 int status; 1114 __be32 *opaque_len; 1115 struct page **inpages; 1116 int first; 1117 int pad; 1118 struct kvec *iov; 1119 char *tmp; 1120 1121 opaque_len = p++; 1122 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 1123 *p++ = htonl(rqstp->rq_seqno); 1124 1125 status = encode(rqstp, p, obj); 1126 if (status) 1127 return status; 1128 1129 status = alloc_enc_pages(rqstp); 1130 if (status) 1131 return status; 1132 first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 1133 inpages = snd_buf->pages + first; 1134 snd_buf->pages = rqstp->rq_enc_pages; 1135 snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 1136 /* Give the tail its own page, in case we need extra space in the 1137 * head when wrapping: */ 1138 if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 1139 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 1140 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 1141 snd_buf->tail[0].iov_base = tmp; 1142 } 1143 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 1144 /* RPC_SLACK_SPACE should prevent this ever happening: */ 1145 BUG_ON(snd_buf->len > snd_buf->buflen); 1146 status = -EIO; 1147 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 1148 * done anyway, so it's safe to put the request on the wire: */ 1149 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1150 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1151 else if (maj_stat) 1152 return status; 1153 1154 *opaque_len = htonl(snd_buf->len - offset); 1155 /* guess whether we're in the head or the tail: */ 1156 if (snd_buf->page_len || snd_buf->tail[0].iov_len) 1157 iov = snd_buf->tail; 1158 else 1159 iov = snd_buf->head; 1160 p = iov->iov_base + iov->iov_len; 1161 pad = 3 - ((snd_buf->len - offset - 1) & 3); 1162 memset(p, 0, pad); 1163 iov->iov_len += pad; 1164 snd_buf->len += pad; 1165 1166 return 0; 1167} 1168 1169static int 1170gss_wrap_req(struct rpc_task *task, 1171 kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 1172{ 1173 struct rpc_cred *cred = task->tk_msg.rpc_cred; 1174 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 1175 gc_base); 1176 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1177 int status = -EIO; 1178 1179 dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 1180 if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 1181 /* The spec seems a little ambiguous here, but I think that not 1182 * wrapping context destruction requests makes the most sense. 1183 */ 1184 status = encode(rqstp, p, obj); 1185 goto out; 1186 } 1187 switch (gss_cred->gc_service) { 1188 case RPC_GSS_SVC_NONE: 1189 status = encode(rqstp, p, obj); 1190 break; 1191 case RPC_GSS_SVC_INTEGRITY: 1192 status = gss_wrap_req_integ(cred, ctx, encode, 1193 rqstp, p, obj); 1194 break; 1195 case RPC_GSS_SVC_PRIVACY: 1196 status = gss_wrap_req_priv(cred, ctx, encode, 1197 rqstp, p, obj); 1198 break; 1199 } 1200out: 1201 gss_put_ctx(ctx); 1202 dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 1203 return status; 1204} 1205 1206static inline int 1207gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1208 struct rpc_rqst *rqstp, __be32 **p) 1209{ 1210 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 1211 struct xdr_buf integ_buf; 1212 struct xdr_netobj mic; 1213 u32 data_offset, mic_offset; 1214 u32 integ_len; 1215 u32 maj_stat; 1216 int status = -EIO; 1217 1218 integ_len = ntohl(*(*p)++); 1219 if (integ_len & 3) 1220 return status; 1221 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 1222 mic_offset = integ_len + data_offset; 1223 if (mic_offset > rcv_buf->len) 1224 return status; 1225 if (ntohl(*(*p)++) != rqstp->rq_seqno) 1226 return status; 1227 1228 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 1229 mic_offset - data_offset)) 1230 return status; 1231 1232 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 1233 return status; 1234 1235 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 1236 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1237 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1238 if (maj_stat != GSS_S_COMPLETE) 1239 return status; 1240 return 0; 1241} 1242 1243static inline int 1244gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1245 struct rpc_rqst *rqstp, __be32 **p) 1246{ 1247 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 1248 u32 offset; 1249 u32 opaque_len; 1250 u32 maj_stat; 1251 int status = -EIO; 1252 1253 opaque_len = ntohl(*(*p)++); 1254 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 1255 if (offset + opaque_len > rcv_buf->len) 1256 return status; 1257 /* remove padding: */ 1258 rcv_buf->len = offset + opaque_len; 1259 1260 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 1261 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1262 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1263 if (maj_stat != GSS_S_COMPLETE) 1264 return status; 1265 if (ntohl(*(*p)++) != rqstp->rq_seqno) 1266 return status; 1267 1268 return 0; 1269} 1270 1271 1272static int 1273gss_unwrap_resp(struct rpc_task *task, 1274 kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 1275{ 1276 struct rpc_cred *cred = task->tk_msg.rpc_cred; 1277 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 1278 gc_base); 1279 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1280 __be32 *savedp = p; 1281 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 1282 int savedlen = head->iov_len; 1283 int status = -EIO; 1284 1285 if (ctx->gc_proc != RPC_GSS_PROC_DATA) 1286 goto out_decode; 1287 switch (gss_cred->gc_service) { 1288 case RPC_GSS_SVC_NONE: 1289 break; 1290 case RPC_GSS_SVC_INTEGRITY: 1291 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 1292 if (status) 1293 goto out; 1294 break; 1295 case RPC_GSS_SVC_PRIVACY: 1296 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 1297 if (status) 1298 goto out; 1299 break; 1300 } 1301 /* take into account extra slack for integrity and privacy cases: */ 1302 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 1303 + (savedlen - head->iov_len); 1304out_decode: 1305 status = decode(rqstp, p, obj); 1306out: 1307 gss_put_ctx(ctx); 1308 dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 1309 status); 1310 return status; 1311} 1312 1313static const struct rpc_authops authgss_ops = { 1314 .owner = THIS_MODULE, 1315 .au_flavor = RPC_AUTH_GSS, 1316 .au_name = "RPCSEC_GSS", 1317 .create = gss_create, 1318 .destroy = gss_destroy, 1319 .lookup_cred = gss_lookup_cred, 1320 .crcreate = gss_create_cred 1321}; 1322 1323static const struct rpc_credops gss_credops = { 1324 .cr_name = "AUTH_GSS", 1325 .crdestroy = gss_destroy_cred, 1326 .cr_init = gss_cred_init, 1327 .crbind = rpcauth_generic_bind_cred, 1328 .crmatch = gss_match, 1329 .crmarshal = gss_marshal, 1330 .crrefresh = gss_refresh, 1331 .crvalidate = gss_validate, 1332 .crwrap_req = gss_wrap_req, 1333 .crunwrap_resp = gss_unwrap_resp, 1334}; 1335 1336static const struct rpc_credops gss_nullops = { 1337 .cr_name = "AUTH_GSS", 1338 .crdestroy = gss_destroy_nullcred, 1339 .crbind = rpcauth_generic_bind_cred, 1340 .crmatch = gss_match, 1341 .crmarshal = gss_marshal, 1342 .crrefresh = gss_refresh_null, 1343 .crvalidate = gss_validate, 1344 .crwrap_req = gss_wrap_req, 1345 .crunwrap_resp = gss_unwrap_resp, 1346}; 1347 1348static struct rpc_pipe_ops gss_upcall_ops = { 1349 .upcall = gss_pipe_upcall, 1350 .downcall = gss_pipe_downcall, 1351 .destroy_msg = gss_pipe_destroy_msg, 1352 .release_pipe = gss_pipe_release, 1353}; 1354 1355/* 1356 * Initialize RPCSEC_GSS module 1357 */ 1358static int __init init_rpcsec_gss(void) 1359{ 1360 int err = 0; 1361 1362 err = rpcauth_register(&authgss_ops); 1363 if (err) 1364 goto out; 1365 err = gss_svc_init(); 1366 if (err) 1367 goto out_unregister; 1368 return 0; 1369out_unregister: 1370 rpcauth_unregister(&authgss_ops); 1371out: 1372 return err; 1373} 1374 1375static void __exit exit_rpcsec_gss(void) 1376{ 1377 gss_svc_shutdown(); 1378 rpcauth_unregister(&authgss_ops); 1379} 1380 1381MODULE_LICENSE("GPL"); 1382module_init(init_rpcsec_gss) 1383module_exit(exit_rpcsec_gss) 1384