auth_gss.c revision 6dcd3926b214a1fb081df18305921dedae269977
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 inline int 373gss_refresh_upcall(struct rpc_task *task) 374{ 375 struct rpc_cred *cred = task->tk_msg.rpc_cred; 376 struct gss_auth *gss_auth = container_of(cred->cr_auth, 377 struct gss_auth, rpc_auth); 378 struct gss_cred *gss_cred = container_of(cred, 379 struct gss_cred, gc_base); 380 struct gss_upcall_msg *gss_msg; 381 struct inode *inode = gss_auth->dentry->d_inode; 382 int err = 0; 383 384 dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 385 cred->cr_uid); 386 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 387 if (IS_ERR(gss_msg)) { 388 err = PTR_ERR(gss_msg); 389 goto out; 390 } 391 spin_lock(&inode->i_lock); 392 if (gss_cred->gc_upcall != NULL) 393 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 394 else if (gss_msg->ctx != NULL) { 395 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 396 gss_cred->gc_upcall = NULL; 397 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 398 } else if (gss_msg->msg.errno >= 0) { 399 task->tk_timeout = 0; 400 gss_cred->gc_upcall = gss_msg; 401 /* gss_upcall_callback will release the reference to gss_upcall_msg */ 402 atomic_inc(&gss_msg->count); 403 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 404 } else 405 err = gss_msg->msg.errno; 406 spin_unlock(&inode->i_lock); 407 gss_release_msg(gss_msg); 408out: 409 dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 410 task->tk_pid, cred->cr_uid, err); 411 return err; 412} 413 414static inline int 415gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 416{ 417 struct inode *inode = gss_auth->dentry->d_inode; 418 struct rpc_cred *cred = &gss_cred->gc_base; 419 struct gss_upcall_msg *gss_msg; 420 DEFINE_WAIT(wait); 421 int err = 0; 422 423 dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 424 gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 425 if (IS_ERR(gss_msg)) { 426 err = PTR_ERR(gss_msg); 427 goto out; 428 } 429 for (;;) { 430 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 431 spin_lock(&inode->i_lock); 432 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 433 break; 434 } 435 spin_unlock(&inode->i_lock); 436 if (signalled()) { 437 err = -ERESTARTSYS; 438 goto out_intr; 439 } 440 schedule(); 441 } 442 if (gss_msg->ctx) 443 gss_cred_set_ctx(cred, gss_msg->ctx); 444 else 445 err = gss_msg->msg.errno; 446 spin_unlock(&inode->i_lock); 447out_intr: 448 finish_wait(&gss_msg->waitqueue, &wait); 449 gss_release_msg(gss_msg); 450out: 451 dprintk("RPC: gss_create_upcall for uid %u result %d\n", 452 cred->cr_uid, err); 453 return err; 454} 455 456static ssize_t 457gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 458 char __user *dst, size_t buflen) 459{ 460 char *data = (char *)msg->data + msg->copied; 461 size_t mlen = min(msg->len, buflen); 462 unsigned long left; 463 464 left = copy_to_user(dst, data, mlen); 465 if (left == mlen) { 466 msg->errno = -EFAULT; 467 return -EFAULT; 468 } 469 470 mlen -= left; 471 msg->copied += mlen; 472 msg->errno = 0; 473 return mlen; 474} 475 476#define MSG_BUF_MAXSIZE 1024 477 478static ssize_t 479gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 480{ 481 const void *p, *end; 482 void *buf; 483 struct gss_upcall_msg *gss_msg; 484 struct inode *inode = filp->f_path.dentry->d_inode; 485 struct gss_cl_ctx *ctx; 486 uid_t uid; 487 ssize_t err = -EFBIG; 488 489 if (mlen > MSG_BUF_MAXSIZE) 490 goto out; 491 err = -ENOMEM; 492 buf = kmalloc(mlen, GFP_NOFS); 493 if (!buf) 494 goto out; 495 496 err = -EFAULT; 497 if (copy_from_user(buf, src, mlen)) 498 goto err; 499 500 end = (const void *)((char *)buf + mlen); 501 p = simple_get_bytes(buf, end, &uid, sizeof(uid)); 502 if (IS_ERR(p)) { 503 err = PTR_ERR(p); 504 goto err; 505 } 506 507 err = -ENOMEM; 508 ctx = gss_alloc_context(); 509 if (ctx == NULL) 510 goto err; 511 512 err = -ENOENT; 513 /* Find a matching upcall */ 514 spin_lock(&inode->i_lock); 515 gss_msg = __gss_find_upcall(RPC_I(inode), uid); 516 if (gss_msg == NULL) { 517 spin_unlock(&inode->i_lock); 518 goto err_put_ctx; 519 } 520 list_del_init(&gss_msg->list); 521 spin_unlock(&inode->i_lock); 522 523 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); 524 if (IS_ERR(p)) { 525 err = PTR_ERR(p); 526 gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES; 527 goto err_release_msg; 528 } 529 gss_msg->ctx = gss_get_ctx(ctx); 530 err = mlen; 531 532err_release_msg: 533 spin_lock(&inode->i_lock); 534 __gss_unhash_msg(gss_msg); 535 spin_unlock(&inode->i_lock); 536 gss_release_msg(gss_msg); 537err_put_ctx: 538 gss_put_ctx(ctx); 539err: 540 kfree(buf); 541out: 542 dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); 543 return err; 544} 545 546static void 547gss_pipe_release(struct inode *inode) 548{ 549 struct rpc_inode *rpci = RPC_I(inode); 550 struct gss_upcall_msg *gss_msg; 551 552 spin_lock(&inode->i_lock); 553 while (!list_empty(&rpci->in_downcall)) { 554 555 gss_msg = list_entry(rpci->in_downcall.next, 556 struct gss_upcall_msg, list); 557 gss_msg->msg.errno = -EPIPE; 558 atomic_inc(&gss_msg->count); 559 __gss_unhash_msg(gss_msg); 560 spin_unlock(&inode->i_lock); 561 gss_release_msg(gss_msg); 562 spin_lock(&inode->i_lock); 563 } 564 spin_unlock(&inode->i_lock); 565} 566 567static void 568gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) 569{ 570 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); 571 static unsigned long ratelimit; 572 573 if (msg->errno < 0) { 574 dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", 575 gss_msg); 576 atomic_inc(&gss_msg->count); 577 gss_unhash_msg(gss_msg); 578 if (msg->errno == -ETIMEDOUT) { 579 unsigned long now = jiffies; 580 if (time_after(now, ratelimit)) { 581 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" 582 "Please check user daemon is running!\n"); 583 ratelimit = now + 15*HZ; 584 } 585 } 586 gss_release_msg(gss_msg); 587 } 588} 589 590/* 591 * NOTE: we have the opportunity to use different 592 * parameters based on the input flavor (which must be a pseudoflavor) 593 */ 594static struct rpc_auth * 595gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 596{ 597 struct gss_auth *gss_auth; 598 struct rpc_auth * auth; 599 int err = -ENOMEM; /* XXX? */ 600 601 dprintk("RPC: creating GSS authenticator for client %p\n", clnt); 602 603 if (!try_module_get(THIS_MODULE)) 604 return ERR_PTR(err); 605 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) 606 goto out_dec; 607 gss_auth->client = clnt; 608 err = -EINVAL; 609 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); 610 if (!gss_auth->mech) { 611 printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", 612 __func__, flavor); 613 goto err_free; 614 } 615 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); 616 if (gss_auth->service == 0) 617 goto err_put_mech; 618 auth = &gss_auth->rpc_auth; 619 auth->au_cslack = GSS_CRED_SLACK >> 2; 620 auth->au_rslack = GSS_VERF_SLACK >> 2; 621 auth->au_ops = &authgss_ops; 622 auth->au_flavor = flavor; 623 atomic_set(&auth->au_count, 1); 624 kref_init(&gss_auth->kref); 625 626 gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, 627 clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 628 if (IS_ERR(gss_auth->dentry)) { 629 err = PTR_ERR(gss_auth->dentry); 630 goto err_put_mech; 631 } 632 633 err = rpcauth_init_credcache(auth); 634 if (err) 635 goto err_unlink_pipe; 636 637 return auth; 638err_unlink_pipe: 639 rpc_unlink(gss_auth->dentry); 640err_put_mech: 641 gss_mech_put(gss_auth->mech); 642err_free: 643 kfree(gss_auth); 644out_dec: 645 module_put(THIS_MODULE); 646 return ERR_PTR(err); 647} 648 649static void 650gss_free(struct gss_auth *gss_auth) 651{ 652 rpc_unlink(gss_auth->dentry); 653 gss_auth->dentry = NULL; 654 gss_mech_put(gss_auth->mech); 655 656 kfree(gss_auth); 657 module_put(THIS_MODULE); 658} 659 660static void 661gss_free_callback(struct kref *kref) 662{ 663 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 664 665 gss_free(gss_auth); 666} 667 668static void 669gss_destroy(struct rpc_auth *auth) 670{ 671 struct gss_auth *gss_auth; 672 673 dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 674 auth, auth->au_flavor); 675 676 rpcauth_destroy_credcache(auth); 677 678 gss_auth = container_of(auth, struct gss_auth, rpc_auth); 679 kref_put(&gss_auth->kref, gss_free_callback); 680} 681 682/* 683 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 684 * to the server with the GSS control procedure field set to 685 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 686 * all RPCSEC_GSS state associated with that context. 687 */ 688static int 689gss_destroying_context(struct rpc_cred *cred) 690{ 691 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 692 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 693 struct rpc_task *task; 694 695 if (gss_cred->gc_ctx == NULL || 696 test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 697 return 0; 698 699 gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 700 cred->cr_ops = &gss_nullops; 701 702 /* Take a reference to ensure the cred will be destroyed either 703 * by the RPC call or by the put_rpccred() below */ 704 get_rpccred(cred); 705 706 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 707 if (!IS_ERR(task)) 708 rpc_put_task(task); 709 710 put_rpccred(cred); 711 return 1; 712} 713 714/* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 715 * to create a new cred or context, so they check that things have been 716 * allocated before freeing them. */ 717static void 718gss_do_free_ctx(struct gss_cl_ctx *ctx) 719{ 720 dprintk("RPC: gss_free_ctx\n"); 721 722 kfree(ctx->gc_wire_ctx.data); 723 kfree(ctx); 724} 725 726static void 727gss_free_ctx_callback(struct rcu_head *head) 728{ 729 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 730 gss_do_free_ctx(ctx); 731} 732 733static void 734gss_free_ctx(struct gss_cl_ctx *ctx) 735{ 736 struct gss_ctx *gc_gss_ctx; 737 738 gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); 739 rcu_assign_pointer(ctx->gc_gss_ctx, NULL); 740 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 741 if (gc_gss_ctx) 742 gss_delete_sec_context(&gc_gss_ctx); 743} 744 745static void 746gss_free_cred(struct gss_cred *gss_cred) 747{ 748 dprintk("RPC: gss_free_cred %p\n", gss_cred); 749 kfree(gss_cred); 750} 751 752static void 753gss_free_cred_callback(struct rcu_head *head) 754{ 755 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 756 gss_free_cred(gss_cred); 757} 758 759static void 760gss_destroy_nullcred(struct rpc_cred *cred) 761{ 762 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 763 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 764 struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 765 766 rcu_assign_pointer(gss_cred->gc_ctx, NULL); 767 call_rcu(&cred->cr_rcu, gss_free_cred_callback); 768 if (ctx) 769 gss_put_ctx(ctx); 770 kref_put(&gss_auth->kref, gss_free_callback); 771} 772 773static void 774gss_destroy_cred(struct rpc_cred *cred) 775{ 776 777 if (gss_destroying_context(cred)) 778 return; 779 gss_destroy_nullcred(cred); 780} 781 782/* 783 * Lookup RPCSEC_GSS cred for the current process 784 */ 785static struct rpc_cred * 786gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 787{ 788 return rpcauth_lookup_credcache(auth, acred, flags); 789} 790 791static struct rpc_cred * 792gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 793{ 794 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 795 struct gss_cred *cred = NULL; 796 int err = -ENOMEM; 797 798 dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 799 acred->uid, auth->au_flavor); 800 801 if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 802 goto out_err; 803 804 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 805 /* 806 * Note: in order to force a call to call_refresh(), we deliberately 807 * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 808 */ 809 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 810 cred->gc_service = gss_auth->service; 811 cred->gc_machine_cred = acred->machine_cred; 812 kref_get(&gss_auth->kref); 813 return &cred->gc_base; 814 815out_err: 816 dprintk("RPC: gss_create_cred failed with error %d\n", err); 817 return ERR_PTR(err); 818} 819 820static int 821gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 822{ 823 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 824 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 825 int err; 826 827 do { 828 err = gss_create_upcall(gss_auth, gss_cred); 829 } while (err == -EAGAIN); 830 return err; 831} 832 833static int 834gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 835{ 836 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 837 838 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 839 goto out; 840 /* Don't match with creds that have expired. */ 841 if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 842 return 0; 843 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 844 return 0; 845out: 846 if (acred->machine_cred != gss_cred->gc_machine_cred) 847 return 0; 848 return (rc->cr_uid == acred->uid); 849} 850 851/* 852* Marshal credentials. 853* Maybe we should keep a cached credential for performance reasons. 854*/ 855static __be32 * 856gss_marshal(struct rpc_task *task, __be32 *p) 857{ 858 struct rpc_cred *cred = task->tk_msg.rpc_cred; 859 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 860 gc_base); 861 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 862 __be32 *cred_len; 863 struct rpc_rqst *req = task->tk_rqstp; 864 u32 maj_stat = 0; 865 struct xdr_netobj mic; 866 struct kvec iov; 867 struct xdr_buf verf_buf; 868 869 dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 870 871 *p++ = htonl(RPC_AUTH_GSS); 872 cred_len = p++; 873 874 spin_lock(&ctx->gc_seq_lock); 875 req->rq_seqno = ctx->gc_seq++; 876 spin_unlock(&ctx->gc_seq_lock); 877 878 *p++ = htonl((u32) RPC_GSS_VERSION); 879 *p++ = htonl((u32) ctx->gc_proc); 880 *p++ = htonl((u32) req->rq_seqno); 881 *p++ = htonl((u32) gss_cred->gc_service); 882 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 883 *cred_len = htonl((p - (cred_len + 1)) << 2); 884 885 /* We compute the checksum for the verifier over the xdr-encoded bytes 886 * starting with the xid and ending at the end of the credential: */ 887 iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 888 req->rq_snd_buf.head[0].iov_base); 889 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 890 xdr_buf_from_iov(&iov, &verf_buf); 891 892 /* set verifier flavor*/ 893 *p++ = htonl(RPC_AUTH_GSS); 894 895 mic.data = (u8 *)(p + 1); 896 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 897 if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 898 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 899 } else if (maj_stat != 0) { 900 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 901 goto out_put_ctx; 902 } 903 p = xdr_encode_opaque(p, NULL, mic.len); 904 gss_put_ctx(ctx); 905 return p; 906out_put_ctx: 907 gss_put_ctx(ctx); 908 return NULL; 909} 910 911static int gss_renew_cred(struct rpc_task *task) 912{ 913 struct rpc_cred *oldcred = task->tk_msg.rpc_cred; 914 struct gss_cred *gss_cred = container_of(oldcred, 915 struct gss_cred, 916 gc_base); 917 struct rpc_auth *auth = oldcred->cr_auth; 918 struct auth_cred acred = { 919 .uid = oldcred->cr_uid, 920 .machine_cred = gss_cred->gc_machine_cred, 921 }; 922 struct rpc_cred *new; 923 924 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 925 if (IS_ERR(new)) 926 return PTR_ERR(new); 927 task->tk_msg.rpc_cred = new; 928 put_rpccred(oldcred); 929 return 0; 930} 931 932/* 933* Refresh credentials. XXX - finish 934*/ 935static int 936gss_refresh(struct rpc_task *task) 937{ 938 struct rpc_cred *cred = task->tk_msg.rpc_cred; 939 int ret = 0; 940 941 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 942 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 943 ret = gss_renew_cred(task); 944 if (ret < 0) 945 goto out; 946 cred = task->tk_msg.rpc_cred; 947 } 948 949 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 950 ret = gss_refresh_upcall(task); 951out: 952 return ret; 953} 954 955/* Dummy refresh routine: used only when destroying the context */ 956static int 957gss_refresh_null(struct rpc_task *task) 958{ 959 return -EACCES; 960} 961 962static __be32 * 963gss_validate(struct rpc_task *task, __be32 *p) 964{ 965 struct rpc_cred *cred = task->tk_msg.rpc_cred; 966 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 967 __be32 seq; 968 struct kvec iov; 969 struct xdr_buf verf_buf; 970 struct xdr_netobj mic; 971 u32 flav,len; 972 u32 maj_stat; 973 974 dprintk("RPC: %5u gss_validate\n", task->tk_pid); 975 976 flav = ntohl(*p++); 977 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 978 goto out_bad; 979 if (flav != RPC_AUTH_GSS) 980 goto out_bad; 981 seq = htonl(task->tk_rqstp->rq_seqno); 982 iov.iov_base = &seq; 983 iov.iov_len = sizeof(seq); 984 xdr_buf_from_iov(&iov, &verf_buf); 985 mic.data = (u8 *)p; 986 mic.len = len; 987 988 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 989 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 990 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 991 if (maj_stat) { 992 dprintk("RPC: %5u gss_validate: gss_verify_mic returned " 993 "error 0x%08x\n", task->tk_pid, maj_stat); 994 goto out_bad; 995 } 996 /* We leave it to unwrap to calculate au_rslack. For now we just 997 * calculate the length of the verifier: */ 998 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 999 gss_put_ctx(ctx); 1000 dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 1001 task->tk_pid); 1002 return p + XDR_QUADLEN(len); 1003out_bad: 1004 gss_put_ctx(ctx); 1005 dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 1006 return NULL; 1007} 1008 1009static inline int 1010gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1011 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 1012{ 1013 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 1014 struct xdr_buf integ_buf; 1015 __be32 *integ_len = NULL; 1016 struct xdr_netobj mic; 1017 u32 offset; 1018 __be32 *q; 1019 struct kvec *iov; 1020 u32 maj_stat = 0; 1021 int status = -EIO; 1022 1023 integ_len = p++; 1024 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 1025 *p++ = htonl(rqstp->rq_seqno); 1026 1027 status = encode(rqstp, p, obj); 1028 if (status) 1029 return status; 1030 1031 if (xdr_buf_subsegment(snd_buf, &integ_buf, 1032 offset, snd_buf->len - offset)) 1033 return status; 1034 *integ_len = htonl(integ_buf.len); 1035 1036 /* guess whether we're in the head or the tail: */ 1037 if (snd_buf->page_len || snd_buf->tail[0].iov_len) 1038 iov = snd_buf->tail; 1039 else 1040 iov = snd_buf->head; 1041 p = iov->iov_base + iov->iov_len; 1042 mic.data = (u8 *)(p + 1); 1043 1044 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 1045 status = -EIO; /* XXX? */ 1046 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1047 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1048 else if (maj_stat) 1049 return status; 1050 q = xdr_encode_opaque(p, NULL, mic.len); 1051 1052 offset = (u8 *)q - (u8 *)p; 1053 iov->iov_len += offset; 1054 snd_buf->len += offset; 1055 return 0; 1056} 1057 1058static void 1059priv_release_snd_buf(struct rpc_rqst *rqstp) 1060{ 1061 int i; 1062 1063 for (i=0; i < rqstp->rq_enc_pages_num; i++) 1064 __free_page(rqstp->rq_enc_pages[i]); 1065 kfree(rqstp->rq_enc_pages); 1066} 1067 1068static int 1069alloc_enc_pages(struct rpc_rqst *rqstp) 1070{ 1071 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 1072 int first, last, i; 1073 1074 if (snd_buf->page_len == 0) { 1075 rqstp->rq_enc_pages_num = 0; 1076 return 0; 1077 } 1078 1079 first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 1080 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 1081 rqstp->rq_enc_pages_num = last - first + 1 + 1; 1082 rqstp->rq_enc_pages 1083 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 1084 GFP_NOFS); 1085 if (!rqstp->rq_enc_pages) 1086 goto out; 1087 for (i=0; i < rqstp->rq_enc_pages_num; i++) { 1088 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 1089 if (rqstp->rq_enc_pages[i] == NULL) 1090 goto out_free; 1091 } 1092 rqstp->rq_release_snd_buf = priv_release_snd_buf; 1093 return 0; 1094out_free: 1095 for (i--; i >= 0; i--) { 1096 __free_page(rqstp->rq_enc_pages[i]); 1097 } 1098out: 1099 return -EAGAIN; 1100} 1101 1102static inline int 1103gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1104 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 1105{ 1106 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 1107 u32 offset; 1108 u32 maj_stat; 1109 int status; 1110 __be32 *opaque_len; 1111 struct page **inpages; 1112 int first; 1113 int pad; 1114 struct kvec *iov; 1115 char *tmp; 1116 1117 opaque_len = p++; 1118 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 1119 *p++ = htonl(rqstp->rq_seqno); 1120 1121 status = encode(rqstp, p, obj); 1122 if (status) 1123 return status; 1124 1125 status = alloc_enc_pages(rqstp); 1126 if (status) 1127 return status; 1128 first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 1129 inpages = snd_buf->pages + first; 1130 snd_buf->pages = rqstp->rq_enc_pages; 1131 snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 1132 /* Give the tail its own page, in case we need extra space in the 1133 * head when wrapping: */ 1134 if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 1135 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 1136 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 1137 snd_buf->tail[0].iov_base = tmp; 1138 } 1139 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 1140 /* RPC_SLACK_SPACE should prevent this ever happening: */ 1141 BUG_ON(snd_buf->len > snd_buf->buflen); 1142 status = -EIO; 1143 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 1144 * done anyway, so it's safe to put the request on the wire: */ 1145 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1146 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1147 else if (maj_stat) 1148 return status; 1149 1150 *opaque_len = htonl(snd_buf->len - offset); 1151 /* guess whether we're in the head or the tail: */ 1152 if (snd_buf->page_len || snd_buf->tail[0].iov_len) 1153 iov = snd_buf->tail; 1154 else 1155 iov = snd_buf->head; 1156 p = iov->iov_base + iov->iov_len; 1157 pad = 3 - ((snd_buf->len - offset - 1) & 3); 1158 memset(p, 0, pad); 1159 iov->iov_len += pad; 1160 snd_buf->len += pad; 1161 1162 return 0; 1163} 1164 1165static int 1166gss_wrap_req(struct rpc_task *task, 1167 kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 1168{ 1169 struct rpc_cred *cred = task->tk_msg.rpc_cred; 1170 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 1171 gc_base); 1172 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1173 int status = -EIO; 1174 1175 dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 1176 if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 1177 /* The spec seems a little ambiguous here, but I think that not 1178 * wrapping context destruction requests makes the most sense. 1179 */ 1180 status = encode(rqstp, p, obj); 1181 goto out; 1182 } 1183 switch (gss_cred->gc_service) { 1184 case RPC_GSS_SVC_NONE: 1185 status = encode(rqstp, p, obj); 1186 break; 1187 case RPC_GSS_SVC_INTEGRITY: 1188 status = gss_wrap_req_integ(cred, ctx, encode, 1189 rqstp, p, obj); 1190 break; 1191 case RPC_GSS_SVC_PRIVACY: 1192 status = gss_wrap_req_priv(cred, ctx, encode, 1193 rqstp, p, obj); 1194 break; 1195 } 1196out: 1197 gss_put_ctx(ctx); 1198 dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 1199 return status; 1200} 1201 1202static inline int 1203gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1204 struct rpc_rqst *rqstp, __be32 **p) 1205{ 1206 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 1207 struct xdr_buf integ_buf; 1208 struct xdr_netobj mic; 1209 u32 data_offset, mic_offset; 1210 u32 integ_len; 1211 u32 maj_stat; 1212 int status = -EIO; 1213 1214 integ_len = ntohl(*(*p)++); 1215 if (integ_len & 3) 1216 return status; 1217 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 1218 mic_offset = integ_len + data_offset; 1219 if (mic_offset > rcv_buf->len) 1220 return status; 1221 if (ntohl(*(*p)++) != rqstp->rq_seqno) 1222 return status; 1223 1224 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 1225 mic_offset - data_offset)) 1226 return status; 1227 1228 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 1229 return status; 1230 1231 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 1232 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1233 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1234 if (maj_stat != GSS_S_COMPLETE) 1235 return status; 1236 return 0; 1237} 1238 1239static inline int 1240gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1241 struct rpc_rqst *rqstp, __be32 **p) 1242{ 1243 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 1244 u32 offset; 1245 u32 opaque_len; 1246 u32 maj_stat; 1247 int status = -EIO; 1248 1249 opaque_len = ntohl(*(*p)++); 1250 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 1251 if (offset + opaque_len > rcv_buf->len) 1252 return status; 1253 /* remove padding: */ 1254 rcv_buf->len = offset + opaque_len; 1255 1256 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 1257 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1258 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1259 if (maj_stat != GSS_S_COMPLETE) 1260 return status; 1261 if (ntohl(*(*p)++) != rqstp->rq_seqno) 1262 return status; 1263 1264 return 0; 1265} 1266 1267 1268static int 1269gss_unwrap_resp(struct rpc_task *task, 1270 kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 1271{ 1272 struct rpc_cred *cred = task->tk_msg.rpc_cred; 1273 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 1274 gc_base); 1275 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1276 __be32 *savedp = p; 1277 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 1278 int savedlen = head->iov_len; 1279 int status = -EIO; 1280 1281 if (ctx->gc_proc != RPC_GSS_PROC_DATA) 1282 goto out_decode; 1283 switch (gss_cred->gc_service) { 1284 case RPC_GSS_SVC_NONE: 1285 break; 1286 case RPC_GSS_SVC_INTEGRITY: 1287 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 1288 if (status) 1289 goto out; 1290 break; 1291 case RPC_GSS_SVC_PRIVACY: 1292 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 1293 if (status) 1294 goto out; 1295 break; 1296 } 1297 /* take into account extra slack for integrity and privacy cases: */ 1298 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 1299 + (savedlen - head->iov_len); 1300out_decode: 1301 status = decode(rqstp, p, obj); 1302out: 1303 gss_put_ctx(ctx); 1304 dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 1305 status); 1306 return status; 1307} 1308 1309static const struct rpc_authops authgss_ops = { 1310 .owner = THIS_MODULE, 1311 .au_flavor = RPC_AUTH_GSS, 1312 .au_name = "RPCSEC_GSS", 1313 .create = gss_create, 1314 .destroy = gss_destroy, 1315 .lookup_cred = gss_lookup_cred, 1316 .crcreate = gss_create_cred 1317}; 1318 1319static const struct rpc_credops gss_credops = { 1320 .cr_name = "AUTH_GSS", 1321 .crdestroy = gss_destroy_cred, 1322 .cr_init = gss_cred_init, 1323 .crbind = rpcauth_generic_bind_cred, 1324 .crmatch = gss_match, 1325 .crmarshal = gss_marshal, 1326 .crrefresh = gss_refresh, 1327 .crvalidate = gss_validate, 1328 .crwrap_req = gss_wrap_req, 1329 .crunwrap_resp = gss_unwrap_resp, 1330}; 1331 1332static const struct rpc_credops gss_nullops = { 1333 .cr_name = "AUTH_GSS", 1334 .crdestroy = gss_destroy_nullcred, 1335 .crbind = rpcauth_generic_bind_cred, 1336 .crmatch = gss_match, 1337 .crmarshal = gss_marshal, 1338 .crrefresh = gss_refresh_null, 1339 .crvalidate = gss_validate, 1340 .crwrap_req = gss_wrap_req, 1341 .crunwrap_resp = gss_unwrap_resp, 1342}; 1343 1344static struct rpc_pipe_ops gss_upcall_ops = { 1345 .upcall = gss_pipe_upcall, 1346 .downcall = gss_pipe_downcall, 1347 .destroy_msg = gss_pipe_destroy_msg, 1348 .release_pipe = gss_pipe_release, 1349}; 1350 1351/* 1352 * Initialize RPCSEC_GSS module 1353 */ 1354static int __init init_rpcsec_gss(void) 1355{ 1356 int err = 0; 1357 1358 err = rpcauth_register(&authgss_ops); 1359 if (err) 1360 goto out; 1361 err = gss_svc_init(); 1362 if (err) 1363 goto out_unregister; 1364 return 0; 1365out_unregister: 1366 rpcauth_unregister(&authgss_ops); 1367out: 1368 return err; 1369} 1370 1371static void __exit exit_rpcsec_gss(void) 1372{ 1373 gss_svc_shutdown(); 1374 rpcauth_unregister(&authgss_ops); 1375} 1376 1377MODULE_LICENSE("GPL"); 1378module_init(init_rpcsec_gss) 1379module_exit(exit_rpcsec_gss) 1380