auth_gss.c revision 0f38b873aeaae698c3693748438547c8493165fb
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; 60static const struct rpc_credops gss_nullops; 61 62#ifdef RPC_DEBUG 63# define RPCDBG_FACILITY RPCDBG_AUTH 64#endif 65 66#define NFS_NGROUPS 16 67 68#define GSS_CRED_SLACK 1024 /* XXX: unused */ 69/* length of a krb5 verifier (48), plus data added before arguments when 70 * using integrity (two 4-byte integers): */ 71#define GSS_VERF_SLACK 100 72 73/* XXX this define must match the gssd define 74* as it is passed to gssd to signal the use of 75* machine creds should be part of the shared rpc interface */ 76 77#define CA_RUN_AS_MACHINE 0x00000200 78 79/* dump the buffer in `emacs-hexl' style */ 80#define isprint(c) ((c > 0x1f) && (c < 0x7f)) 81 82struct gss_auth { 83 struct kref kref; 84 struct rpc_auth rpc_auth; 85 struct gss_api_mech *mech; 86 enum rpc_gss_svc service; 87 struct rpc_clnt *client; 88 struct dentry *dentry; 89}; 90 91static void gss_free_ctx(struct gss_cl_ctx *); 92static struct rpc_pipe_ops gss_upcall_ops; 93 94static inline struct gss_cl_ctx * 95gss_get_ctx(struct gss_cl_ctx *ctx) 96{ 97 atomic_inc(&ctx->count); 98 return ctx; 99} 100 101static inline void 102gss_put_ctx(struct gss_cl_ctx *ctx) 103{ 104 if (atomic_dec_and_test(&ctx->count)) 105 gss_free_ctx(ctx); 106} 107 108/* gss_cred_set_ctx: 109 * called by gss_upcall_callback and gss_create_upcall in order 110 * to set the gss context. The actual exchange of an old context 111 * and a new one is protected by the inode->i_lock. 112 */ 113static void 114gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) 115{ 116 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 117 118 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 119 return; 120 gss_get_ctx(ctx); 121 rcu_assign_pointer(gss_cred->gc_ctx, ctx); 122 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 123 smp_mb__before_clear_bit(); 124 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); 125} 126 127static const void * 128simple_get_bytes(const void *p, const void *end, void *res, size_t len) 129{ 130 const void *q = (const void *)((const char *)p + len); 131 if (unlikely(q > end || q < p)) 132 return ERR_PTR(-EFAULT); 133 memcpy(res, p, len); 134 return q; 135} 136 137static inline const void * 138simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) 139{ 140 const void *q; 141 unsigned int len; 142 143 p = simple_get_bytes(p, end, &len, sizeof(len)); 144 if (IS_ERR(p)) 145 return p; 146 q = (const void *)((const char *)p + len); 147 if (unlikely(q > end || q < p)) 148 return ERR_PTR(-EFAULT); 149 dest->data = kmemdup(p, len, GFP_NOFS); 150 if (unlikely(dest->data == NULL)) 151 return ERR_PTR(-ENOMEM); 152 dest->len = len; 153 return q; 154} 155 156static struct gss_cl_ctx * 157gss_cred_get_ctx(struct rpc_cred *cred) 158{ 159 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 160 struct gss_cl_ctx *ctx = NULL; 161 162 rcu_read_lock(); 163 if (gss_cred->gc_ctx) 164 ctx = gss_get_ctx(gss_cred->gc_ctx); 165 rcu_read_unlock(); 166 return ctx; 167} 168 169static struct gss_cl_ctx * 170gss_alloc_context(void) 171{ 172 struct gss_cl_ctx *ctx; 173 174 ctx = kzalloc(sizeof(*ctx), GFP_NOFS); 175 if (ctx != NULL) { 176 ctx->gc_proc = RPC_GSS_PROC_DATA; 177 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ 178 spin_lock_init(&ctx->gc_seq_lock); 179 atomic_set(&ctx->count,1); 180 } 181 return ctx; 182} 183 184#define GSSD_MIN_TIMEOUT (60 * 60) 185static const void * 186gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) 187{ 188 const void *q; 189 unsigned int seclen; 190 unsigned int timeout; 191 u32 window_size; 192 int ret; 193 194 /* First unsigned int gives the lifetime (in seconds) of the cred */ 195 p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); 196 if (IS_ERR(p)) 197 goto err; 198 if (timeout == 0) 199 timeout = GSSD_MIN_TIMEOUT; 200 ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; 201 /* Sequence number window. Determines the maximum number of simultaneous requests */ 202 p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); 203 if (IS_ERR(p)) 204 goto err; 205 ctx->gc_win = window_size; 206 /* gssd signals an error by passing ctx->gc_win = 0: */ 207 if (ctx->gc_win == 0) { 208 /* in which case, p points to an error code which we ignore */ 209 p = ERR_PTR(-EACCES); 210 goto err; 211 } 212 /* copy the opaque wire context */ 213 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); 214 if (IS_ERR(p)) 215 goto err; 216 /* import the opaque security context */ 217 p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); 218 if (IS_ERR(p)) 219 goto err; 220 q = (const void *)((const char *)p + seclen); 221 if (unlikely(q > end || q < p)) { 222 p = ERR_PTR(-EFAULT); 223 goto err; 224 } 225 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); 226 if (ret < 0) { 227 p = ERR_PTR(ret); 228 goto err; 229 } 230 return q; 231err: 232 dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); 233 return p; 234} 235 236 237struct gss_upcall_msg { 238 atomic_t count; 239 uid_t uid; 240 struct rpc_pipe_msg msg; 241 struct list_head list; 242 struct gss_auth *auth; 243 struct rpc_wait_queue rpc_waitqueue; 244 wait_queue_head_t waitqueue; 245 struct gss_cl_ctx *ctx; 246}; 247 248static void 249gss_release_msg(struct gss_upcall_msg *gss_msg) 250{ 251 if (!atomic_dec_and_test(&gss_msg->count)) 252 return; 253 BUG_ON(!list_empty(&gss_msg->list)); 254 if (gss_msg->ctx != NULL) 255 gss_put_ctx(gss_msg->ctx); 256 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); 257 kfree(gss_msg); 258} 259 260static struct gss_upcall_msg * 261__gss_find_upcall(struct rpc_inode *rpci, uid_t uid) 262{ 263 struct gss_upcall_msg *pos; 264 list_for_each_entry(pos, &rpci->in_downcall, list) { 265 if (pos->uid != uid) 266 continue; 267 atomic_inc(&pos->count); 268 dprintk("RPC: gss_find_upcall found msg %p\n", pos); 269 return pos; 270 } 271 dprintk("RPC: gss_find_upcall found nothing\n"); 272 return NULL; 273} 274 275/* Try to add a upcall to the pipefs queue. 276 * If an upcall owned by our uid already exists, then we return a reference 277 * to that upcall instead of adding the new upcall. 278 */ 279static inline struct gss_upcall_msg * 280gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) 281{ 282 struct inode *inode = gss_auth->dentry->d_inode; 283 struct rpc_inode *rpci = RPC_I(inode); 284 struct gss_upcall_msg *old; 285 286 spin_lock(&inode->i_lock); 287 old = __gss_find_upcall(rpci, gss_msg->uid); 288 if (old == NULL) { 289 atomic_inc(&gss_msg->count); 290 list_add(&gss_msg->list, &rpci->in_downcall); 291 } else 292 gss_msg = old; 293 spin_unlock(&inode->i_lock); 294 return gss_msg; 295} 296 297static void 298__gss_unhash_msg(struct gss_upcall_msg *gss_msg) 299{ 300 list_del_init(&gss_msg->list); 301 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 302 wake_up_all(&gss_msg->waitqueue); 303 atomic_dec(&gss_msg->count); 304} 305 306static void 307gss_unhash_msg(struct gss_upcall_msg *gss_msg) 308{ 309 struct gss_auth *gss_auth = gss_msg->auth; 310 struct inode *inode = gss_auth->dentry->d_inode; 311 312 if (list_empty(&gss_msg->list)) 313 return; 314 spin_lock(&inode->i_lock); 315 if (!list_empty(&gss_msg->list)) 316 __gss_unhash_msg(gss_msg); 317 spin_unlock(&inode->i_lock); 318} 319 320static void 321gss_upcall_callback(struct rpc_task *task) 322{ 323 struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, 324 struct gss_cred, gc_base); 325 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; 326 struct inode *inode = gss_msg->auth->dentry->d_inode; 327 328 spin_lock(&inode->i_lock); 329 if (gss_msg->ctx) 330 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 331 else 332 task->tk_status = gss_msg->msg.errno; 333 gss_cred->gc_upcall = NULL; 334 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 335 spin_unlock(&inode->i_lock); 336 gss_release_msg(gss_msg); 337} 338 339static inline struct gss_upcall_msg * 340gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) 341{ 342 struct gss_upcall_msg *gss_msg; 343 344 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); 345 if (gss_msg != NULL) { 346 INIT_LIST_HEAD(&gss_msg->list); 347 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); 348 init_waitqueue_head(&gss_msg->waitqueue); 349 atomic_set(&gss_msg->count, 1); 350 gss_msg->msg.data = &gss_msg->uid; 351 gss_msg->msg.len = sizeof(gss_msg->uid); 352 gss_msg->uid = uid; 353 gss_msg->auth = gss_auth; 354 } 355 return gss_msg; 356} 357 358static struct gss_upcall_msg * 359gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) 360{ 361 struct gss_cred *gss_cred = container_of(cred, 362 struct gss_cred, gc_base); 363 struct gss_upcall_msg *gss_new, *gss_msg; 364 uid_t uid = cred->cr_uid; 365 366 /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */ 367 if (gss_cred->gc_machine_cred != 0) 368 uid = 0; 369 370 gss_new = gss_alloc_msg(gss_auth, uid); 371 if (gss_new == NULL) 372 return ERR_PTR(-ENOMEM); 373 gss_msg = gss_add_msg(gss_auth, gss_new); 374 if (gss_msg == gss_new) { 375 int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); 376 if (res) { 377 gss_unhash_msg(gss_new); 378 gss_msg = ERR_PTR(res); 379 } 380 } else 381 gss_release_msg(gss_new); 382 return gss_msg; 383} 384 385static inline int 386gss_refresh_upcall(struct rpc_task *task) 387{ 388 struct rpc_cred *cred = task->tk_msg.rpc_cred; 389 struct gss_auth *gss_auth = container_of(cred->cr_auth, 390 struct gss_auth, rpc_auth); 391 struct gss_cred *gss_cred = container_of(cred, 392 struct gss_cred, gc_base); 393 struct gss_upcall_msg *gss_msg; 394 struct inode *inode = gss_auth->dentry->d_inode; 395 int err = 0; 396 397 dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, 398 cred->cr_uid); 399 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); 400 if (IS_ERR(gss_msg)) { 401 err = PTR_ERR(gss_msg); 402 goto out; 403 } 404 spin_lock(&inode->i_lock); 405 if (gss_cred->gc_upcall != NULL) 406 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); 407 else if (gss_msg->ctx != NULL) { 408 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); 409 gss_cred->gc_upcall = NULL; 410 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); 411 } else if (gss_msg->msg.errno >= 0) { 412 task->tk_timeout = 0; 413 gss_cred->gc_upcall = gss_msg; 414 /* gss_upcall_callback will release the reference to gss_upcall_msg */ 415 atomic_inc(&gss_msg->count); 416 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); 417 } else 418 err = gss_msg->msg.errno; 419 spin_unlock(&inode->i_lock); 420 gss_release_msg(gss_msg); 421out: 422 dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", 423 task->tk_pid, cred->cr_uid, err); 424 return err; 425} 426 427static inline int 428gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) 429{ 430 struct inode *inode = gss_auth->dentry->d_inode; 431 struct rpc_cred *cred = &gss_cred->gc_base; 432 struct gss_upcall_msg *gss_msg; 433 DEFINE_WAIT(wait); 434 int err = 0; 435 436 dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); 437 gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); 438 if (IS_ERR(gss_msg)) { 439 err = PTR_ERR(gss_msg); 440 goto out; 441 } 442 for (;;) { 443 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); 444 spin_lock(&inode->i_lock); 445 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { 446 break; 447 } 448 spin_unlock(&inode->i_lock); 449 if (signalled()) { 450 err = -ERESTARTSYS; 451 goto out_intr; 452 } 453 schedule(); 454 } 455 if (gss_msg->ctx) 456 gss_cred_set_ctx(cred, gss_msg->ctx); 457 else 458 err = gss_msg->msg.errno; 459 spin_unlock(&inode->i_lock); 460out_intr: 461 finish_wait(&gss_msg->waitqueue, &wait); 462 gss_release_msg(gss_msg); 463out: 464 dprintk("RPC: gss_create_upcall for uid %u result %d\n", 465 cred->cr_uid, err); 466 return err; 467} 468 469static ssize_t 470gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, 471 char __user *dst, size_t buflen) 472{ 473 char *data = (char *)msg->data + msg->copied; 474 size_t mlen = min(msg->len, buflen); 475 unsigned long left; 476 477 left = copy_to_user(dst, data, mlen); 478 if (left == mlen) { 479 msg->errno = -EFAULT; 480 return -EFAULT; 481 } 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_NOFS); 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 == -EAGAIN) ? -EAGAIN : -EACCES; 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!\n", 627 __func__, 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 kref_init(&gss_auth->kref); 640 641 gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, 642 clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 643 if (IS_ERR(gss_auth->dentry)) { 644 err = PTR_ERR(gss_auth->dentry); 645 goto err_put_mech; 646 } 647 648 err = rpcauth_init_credcache(auth); 649 if (err) 650 goto err_unlink_pipe; 651 652 return auth; 653err_unlink_pipe: 654 rpc_unlink(gss_auth->dentry); 655err_put_mech: 656 gss_mech_put(gss_auth->mech); 657err_free: 658 kfree(gss_auth); 659out_dec: 660 module_put(THIS_MODULE); 661 return ERR_PTR(err); 662} 663 664static void 665gss_free(struct gss_auth *gss_auth) 666{ 667 rpc_unlink(gss_auth->dentry); 668 gss_auth->dentry = NULL; 669 gss_mech_put(gss_auth->mech); 670 671 kfree(gss_auth); 672 module_put(THIS_MODULE); 673} 674 675static void 676gss_free_callback(struct kref *kref) 677{ 678 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); 679 680 gss_free(gss_auth); 681} 682 683static void 684gss_destroy(struct rpc_auth *auth) 685{ 686 struct gss_auth *gss_auth; 687 688 dprintk("RPC: destroying GSS authenticator %p flavor %d\n", 689 auth, auth->au_flavor); 690 691 rpcauth_destroy_credcache(auth); 692 693 gss_auth = container_of(auth, struct gss_auth, rpc_auth); 694 kref_put(&gss_auth->kref, gss_free_callback); 695} 696 697/* 698 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call 699 * to the server with the GSS control procedure field set to 700 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release 701 * all RPCSEC_GSS state associated with that context. 702 */ 703static int 704gss_destroying_context(struct rpc_cred *cred) 705{ 706 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 707 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 708 struct rpc_task *task; 709 710 if (gss_cred->gc_ctx == NULL || 711 test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) 712 return 0; 713 714 gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; 715 cred->cr_ops = &gss_nullops; 716 717 /* Take a reference to ensure the cred will be destroyed either 718 * by the RPC call or by the put_rpccred() below */ 719 get_rpccred(cred); 720 721 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); 722 if (!IS_ERR(task)) 723 rpc_put_task(task); 724 725 put_rpccred(cred); 726 return 1; 727} 728 729/* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure 730 * to create a new cred or context, so they check that things have been 731 * allocated before freeing them. */ 732static void 733gss_do_free_ctx(struct gss_cl_ctx *ctx) 734{ 735 dprintk("RPC: gss_free_ctx\n"); 736 737 kfree(ctx->gc_wire_ctx.data); 738 kfree(ctx); 739} 740 741static void 742gss_free_ctx_callback(struct rcu_head *head) 743{ 744 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); 745 gss_do_free_ctx(ctx); 746} 747 748static void 749gss_free_ctx(struct gss_cl_ctx *ctx) 750{ 751 struct gss_ctx *gc_gss_ctx; 752 753 gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); 754 rcu_assign_pointer(ctx->gc_gss_ctx, NULL); 755 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); 756 if (gc_gss_ctx) 757 gss_delete_sec_context(&gc_gss_ctx); 758} 759 760static void 761gss_free_cred(struct gss_cred *gss_cred) 762{ 763 dprintk("RPC: gss_free_cred %p\n", gss_cred); 764 kfree(gss_cred); 765} 766 767static void 768gss_free_cred_callback(struct rcu_head *head) 769{ 770 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); 771 gss_free_cred(gss_cred); 772} 773 774static void 775gss_destroy_cred(struct rpc_cred *cred) 776{ 777 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); 778 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); 779 struct gss_cl_ctx *ctx = gss_cred->gc_ctx; 780 781 if (gss_destroying_context(cred)) 782 return; 783 rcu_assign_pointer(gss_cred->gc_ctx, NULL); 784 call_rcu(&cred->cr_rcu, gss_free_cred_callback); 785 if (ctx) 786 gss_put_ctx(ctx); 787 kref_put(&gss_auth->kref, gss_free_callback); 788} 789 790/* 791 * Lookup RPCSEC_GSS cred for the current process 792 */ 793static struct rpc_cred * 794gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 795{ 796 return rpcauth_lookup_credcache(auth, acred, flags); 797} 798 799static struct rpc_cred * 800gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 801{ 802 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 803 struct gss_cred *cred = NULL; 804 int err = -ENOMEM; 805 806 dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", 807 acred->uid, auth->au_flavor); 808 809 if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) 810 goto out_err; 811 812 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); 813 /* 814 * Note: in order to force a call to call_refresh(), we deliberately 815 * fail to flag the credential as RPCAUTH_CRED_UPTODATE. 816 */ 817 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; 818 cred->gc_service = gss_auth->service; 819 cred->gc_machine_cred = acred->machine_cred; 820 kref_get(&gss_auth->kref); 821 return &cred->gc_base; 822 823out_err: 824 dprintk("RPC: gss_create_cred failed with error %d\n", err); 825 return ERR_PTR(err); 826} 827 828static int 829gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) 830{ 831 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); 832 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); 833 int err; 834 835 do { 836 err = gss_create_upcall(gss_auth, gss_cred); 837 } while (err == -EAGAIN); 838 return err; 839} 840 841static int 842gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) 843{ 844 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); 845 846 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) 847 goto out; 848 /* Don't match with creds that have expired. */ 849 if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) 850 return 0; 851 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) 852 return 0; 853out: 854 if (acred->machine_cred != gss_cred->gc_machine_cred) 855 return 0; 856 return (rc->cr_uid == acred->uid); 857} 858 859/* 860* Marshal credentials. 861* Maybe we should keep a cached credential for performance reasons. 862*/ 863static __be32 * 864gss_marshal(struct rpc_task *task, __be32 *p) 865{ 866 struct rpc_cred *cred = task->tk_msg.rpc_cred; 867 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 868 gc_base); 869 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 870 __be32 *cred_len; 871 struct rpc_rqst *req = task->tk_rqstp; 872 u32 maj_stat = 0; 873 struct xdr_netobj mic; 874 struct kvec iov; 875 struct xdr_buf verf_buf; 876 877 dprintk("RPC: %5u gss_marshal\n", task->tk_pid); 878 879 *p++ = htonl(RPC_AUTH_GSS); 880 cred_len = p++; 881 882 spin_lock(&ctx->gc_seq_lock); 883 req->rq_seqno = ctx->gc_seq++; 884 spin_unlock(&ctx->gc_seq_lock); 885 886 *p++ = htonl((u32) RPC_GSS_VERSION); 887 *p++ = htonl((u32) ctx->gc_proc); 888 *p++ = htonl((u32) req->rq_seqno); 889 *p++ = htonl((u32) gss_cred->gc_service); 890 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); 891 *cred_len = htonl((p - (cred_len + 1)) << 2); 892 893 /* We compute the checksum for the verifier over the xdr-encoded bytes 894 * starting with the xid and ending at the end of the credential: */ 895 iov.iov_base = xprt_skip_transport_header(task->tk_xprt, 896 req->rq_snd_buf.head[0].iov_base); 897 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; 898 xdr_buf_from_iov(&iov, &verf_buf); 899 900 /* set verifier flavor*/ 901 *p++ = htonl(RPC_AUTH_GSS); 902 903 mic.data = (u8 *)(p + 1); 904 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 905 if (maj_stat == GSS_S_CONTEXT_EXPIRED) { 906 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 907 } else if (maj_stat != 0) { 908 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); 909 goto out_put_ctx; 910 } 911 p = xdr_encode_opaque(p, NULL, mic.len); 912 gss_put_ctx(ctx); 913 return p; 914out_put_ctx: 915 gss_put_ctx(ctx); 916 return NULL; 917} 918 919static int gss_renew_cred(struct rpc_task *task) 920{ 921 struct rpc_cred *oldcred = task->tk_msg.rpc_cred; 922 struct gss_cred *gss_cred = container_of(oldcred, 923 struct gss_cred, 924 gc_base); 925 struct rpc_auth *auth = oldcred->cr_auth; 926 struct auth_cred acred = { 927 .uid = oldcred->cr_uid, 928 .machine_cred = gss_cred->gc_machine_cred, 929 }; 930 struct rpc_cred *new; 931 932 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); 933 if (IS_ERR(new)) 934 return PTR_ERR(new); 935 task->tk_msg.rpc_cred = new; 936 put_rpccred(oldcred); 937 return 0; 938} 939 940/* 941* Refresh credentials. XXX - finish 942*/ 943static int 944gss_refresh(struct rpc_task *task) 945{ 946 struct rpc_cred *cred = task->tk_msg.rpc_cred; 947 int ret = 0; 948 949 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && 950 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { 951 ret = gss_renew_cred(task); 952 if (ret < 0) 953 goto out; 954 cred = task->tk_msg.rpc_cred; 955 } 956 957 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) 958 ret = gss_refresh_upcall(task); 959out: 960 return ret; 961} 962 963/* Dummy refresh routine: used only when destroying the context */ 964static int 965gss_refresh_null(struct rpc_task *task) 966{ 967 return -EACCES; 968} 969 970static __be32 * 971gss_validate(struct rpc_task *task, __be32 *p) 972{ 973 struct rpc_cred *cred = task->tk_msg.rpc_cred; 974 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 975 __be32 seq; 976 struct kvec iov; 977 struct xdr_buf verf_buf; 978 struct xdr_netobj mic; 979 u32 flav,len; 980 u32 maj_stat; 981 982 dprintk("RPC: %5u gss_validate\n", task->tk_pid); 983 984 flav = ntohl(*p++); 985 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) 986 goto out_bad; 987 if (flav != RPC_AUTH_GSS) 988 goto out_bad; 989 seq = htonl(task->tk_rqstp->rq_seqno); 990 iov.iov_base = &seq; 991 iov.iov_len = sizeof(seq); 992 xdr_buf_from_iov(&iov, &verf_buf); 993 mic.data = (u8 *)p; 994 mic.len = len; 995 996 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); 997 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 998 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 999 if (maj_stat) { 1000 dprintk("RPC: %5u gss_validate: gss_verify_mic returned " 1001 "error 0x%08x\n", task->tk_pid, maj_stat); 1002 goto out_bad; 1003 } 1004 /* We leave it to unwrap to calculate au_rslack. For now we just 1005 * calculate the length of the verifier: */ 1006 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; 1007 gss_put_ctx(ctx); 1008 dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", 1009 task->tk_pid); 1010 return p + XDR_QUADLEN(len); 1011out_bad: 1012 gss_put_ctx(ctx); 1013 dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); 1014 return NULL; 1015} 1016 1017static inline int 1018gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1019 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 1020{ 1021 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 1022 struct xdr_buf integ_buf; 1023 __be32 *integ_len = NULL; 1024 struct xdr_netobj mic; 1025 u32 offset; 1026 __be32 *q; 1027 struct kvec *iov; 1028 u32 maj_stat = 0; 1029 int status = -EIO; 1030 1031 integ_len = p++; 1032 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 1033 *p++ = htonl(rqstp->rq_seqno); 1034 1035 status = rpc_call_xdrproc(encode, rqstp, p, obj); 1036 if (status) 1037 return status; 1038 1039 if (xdr_buf_subsegment(snd_buf, &integ_buf, 1040 offset, snd_buf->len - offset)) 1041 return status; 1042 *integ_len = htonl(integ_buf.len); 1043 1044 /* guess whether we're in the head or the tail: */ 1045 if (snd_buf->page_len || snd_buf->tail[0].iov_len) 1046 iov = snd_buf->tail; 1047 else 1048 iov = snd_buf->head; 1049 p = iov->iov_base + iov->iov_len; 1050 mic.data = (u8 *)(p + 1); 1051 1052 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 1053 status = -EIO; /* XXX? */ 1054 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1055 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1056 else if (maj_stat) 1057 return status; 1058 q = xdr_encode_opaque(p, NULL, mic.len); 1059 1060 offset = (u8 *)q - (u8 *)p; 1061 iov->iov_len += offset; 1062 snd_buf->len += offset; 1063 return 0; 1064} 1065 1066static void 1067priv_release_snd_buf(struct rpc_rqst *rqstp) 1068{ 1069 int i; 1070 1071 for (i=0; i < rqstp->rq_enc_pages_num; i++) 1072 __free_page(rqstp->rq_enc_pages[i]); 1073 kfree(rqstp->rq_enc_pages); 1074} 1075 1076static int 1077alloc_enc_pages(struct rpc_rqst *rqstp) 1078{ 1079 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 1080 int first, last, i; 1081 1082 if (snd_buf->page_len == 0) { 1083 rqstp->rq_enc_pages_num = 0; 1084 return 0; 1085 } 1086 1087 first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 1088 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; 1089 rqstp->rq_enc_pages_num = last - first + 1 + 1; 1090 rqstp->rq_enc_pages 1091 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), 1092 GFP_NOFS); 1093 if (!rqstp->rq_enc_pages) 1094 goto out; 1095 for (i=0; i < rqstp->rq_enc_pages_num; i++) { 1096 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); 1097 if (rqstp->rq_enc_pages[i] == NULL) 1098 goto out_free; 1099 } 1100 rqstp->rq_release_snd_buf = priv_release_snd_buf; 1101 return 0; 1102out_free: 1103 for (i--; i >= 0; i--) { 1104 __free_page(rqstp->rq_enc_pages[i]); 1105 } 1106out: 1107 return -EAGAIN; 1108} 1109 1110static inline int 1111gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1112 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) 1113{ 1114 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; 1115 u32 offset; 1116 u32 maj_stat; 1117 int status; 1118 __be32 *opaque_len; 1119 struct page **inpages; 1120 int first; 1121 int pad; 1122 struct kvec *iov; 1123 char *tmp; 1124 1125 opaque_len = p++; 1126 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; 1127 *p++ = htonl(rqstp->rq_seqno); 1128 1129 status = rpc_call_xdrproc(encode, rqstp, p, obj); 1130 if (status) 1131 return status; 1132 1133 status = alloc_enc_pages(rqstp); 1134 if (status) 1135 return status; 1136 first = snd_buf->page_base >> PAGE_CACHE_SHIFT; 1137 inpages = snd_buf->pages + first; 1138 snd_buf->pages = rqstp->rq_enc_pages; 1139 snd_buf->page_base -= first << PAGE_CACHE_SHIFT; 1140 /* Give the tail its own page, in case we need extra space in the 1141 * head when wrapping: */ 1142 if (snd_buf->page_len || snd_buf->tail[0].iov_len) { 1143 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); 1144 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); 1145 snd_buf->tail[0].iov_base = tmp; 1146 } 1147 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); 1148 /* RPC_SLACK_SPACE should prevent this ever happening: */ 1149 BUG_ON(snd_buf->len > snd_buf->buflen); 1150 status = -EIO; 1151 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was 1152 * done anyway, so it's safe to put the request on the wire: */ 1153 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1154 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1155 else if (maj_stat) 1156 return status; 1157 1158 *opaque_len = htonl(snd_buf->len - offset); 1159 /* guess whether we're in the head or the tail: */ 1160 if (snd_buf->page_len || snd_buf->tail[0].iov_len) 1161 iov = snd_buf->tail; 1162 else 1163 iov = snd_buf->head; 1164 p = iov->iov_base + iov->iov_len; 1165 pad = 3 - ((snd_buf->len - offset - 1) & 3); 1166 memset(p, 0, pad); 1167 iov->iov_len += pad; 1168 snd_buf->len += pad; 1169 1170 return 0; 1171} 1172 1173static int 1174gss_wrap_req(struct rpc_task *task, 1175 kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) 1176{ 1177 struct rpc_cred *cred = task->tk_msg.rpc_cred; 1178 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 1179 gc_base); 1180 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1181 int status = -EIO; 1182 1183 dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); 1184 if (ctx->gc_proc != RPC_GSS_PROC_DATA) { 1185 /* The spec seems a little ambiguous here, but I think that not 1186 * wrapping context destruction requests makes the most sense. 1187 */ 1188 status = rpc_call_xdrproc(encode, rqstp, p, obj); 1189 goto out; 1190 } 1191 switch (gss_cred->gc_service) { 1192 case RPC_GSS_SVC_NONE: 1193 status = rpc_call_xdrproc(encode, rqstp, p, obj); 1194 break; 1195 case RPC_GSS_SVC_INTEGRITY: 1196 status = gss_wrap_req_integ(cred, ctx, encode, 1197 rqstp, p, obj); 1198 break; 1199 case RPC_GSS_SVC_PRIVACY: 1200 status = gss_wrap_req_priv(cred, ctx, encode, 1201 rqstp, p, obj); 1202 break; 1203 } 1204out: 1205 gss_put_ctx(ctx); 1206 dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); 1207 return status; 1208} 1209 1210static inline int 1211gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1212 struct rpc_rqst *rqstp, __be32 **p) 1213{ 1214 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 1215 struct xdr_buf integ_buf; 1216 struct xdr_netobj mic; 1217 u32 data_offset, mic_offset; 1218 u32 integ_len; 1219 u32 maj_stat; 1220 int status = -EIO; 1221 1222 integ_len = ntohl(*(*p)++); 1223 if (integ_len & 3) 1224 return status; 1225 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 1226 mic_offset = integ_len + data_offset; 1227 if (mic_offset > rcv_buf->len) 1228 return status; 1229 if (ntohl(*(*p)++) != rqstp->rq_seqno) 1230 return status; 1231 1232 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, 1233 mic_offset - data_offset)) 1234 return status; 1235 1236 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) 1237 return status; 1238 1239 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); 1240 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1241 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1242 if (maj_stat != GSS_S_COMPLETE) 1243 return status; 1244 return 0; 1245} 1246 1247static inline int 1248gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 1249 struct rpc_rqst *rqstp, __be32 **p) 1250{ 1251 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; 1252 u32 offset; 1253 u32 opaque_len; 1254 u32 maj_stat; 1255 int status = -EIO; 1256 1257 opaque_len = ntohl(*(*p)++); 1258 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; 1259 if (offset + opaque_len > rcv_buf->len) 1260 return status; 1261 /* remove padding: */ 1262 rcv_buf->len = offset + opaque_len; 1263 1264 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); 1265 if (maj_stat == GSS_S_CONTEXT_EXPIRED) 1266 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); 1267 if (maj_stat != GSS_S_COMPLETE) 1268 return status; 1269 if (ntohl(*(*p)++) != rqstp->rq_seqno) 1270 return status; 1271 1272 return 0; 1273} 1274 1275 1276static int 1277gss_unwrap_resp(struct rpc_task *task, 1278 kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) 1279{ 1280 struct rpc_cred *cred = task->tk_msg.rpc_cred; 1281 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, 1282 gc_base); 1283 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); 1284 __be32 *savedp = p; 1285 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; 1286 int savedlen = head->iov_len; 1287 int status = -EIO; 1288 1289 if (ctx->gc_proc != RPC_GSS_PROC_DATA) 1290 goto out_decode; 1291 switch (gss_cred->gc_service) { 1292 case RPC_GSS_SVC_NONE: 1293 break; 1294 case RPC_GSS_SVC_INTEGRITY: 1295 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); 1296 if (status) 1297 goto out; 1298 break; 1299 case RPC_GSS_SVC_PRIVACY: 1300 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); 1301 if (status) 1302 goto out; 1303 break; 1304 } 1305 /* take into account extra slack for integrity and privacy cases: */ 1306 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) 1307 + (savedlen - head->iov_len); 1308out_decode: 1309 status = rpc_call_xdrproc(decode, rqstp, p, obj); 1310out: 1311 gss_put_ctx(ctx); 1312 dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, 1313 status); 1314 return status; 1315} 1316 1317static const struct rpc_authops authgss_ops = { 1318 .owner = THIS_MODULE, 1319 .au_flavor = RPC_AUTH_GSS, 1320 .au_name = "RPCSEC_GSS", 1321 .create = gss_create, 1322 .destroy = gss_destroy, 1323 .lookup_cred = gss_lookup_cred, 1324 .crcreate = gss_create_cred 1325}; 1326 1327static const struct rpc_credops gss_credops = { 1328 .cr_name = "AUTH_GSS", 1329 .crdestroy = gss_destroy_cred, 1330 .cr_init = gss_cred_init, 1331 .crbind = rpcauth_generic_bind_cred, 1332 .crmatch = gss_match, 1333 .crmarshal = gss_marshal, 1334 .crrefresh = gss_refresh, 1335 .crvalidate = gss_validate, 1336 .crwrap_req = gss_wrap_req, 1337 .crunwrap_resp = gss_unwrap_resp, 1338}; 1339 1340static const struct rpc_credops gss_nullops = { 1341 .cr_name = "AUTH_GSS", 1342 .crdestroy = gss_destroy_cred, 1343 .crbind = rpcauth_generic_bind_cred, 1344 .crmatch = gss_match, 1345 .crmarshal = gss_marshal, 1346 .crrefresh = gss_refresh_null, 1347 .crvalidate = gss_validate, 1348 .crwrap_req = gss_wrap_req, 1349 .crunwrap_resp = gss_unwrap_resp, 1350}; 1351 1352static struct rpc_pipe_ops gss_upcall_ops = { 1353 .upcall = gss_pipe_upcall, 1354 .downcall = gss_pipe_downcall, 1355 .destroy_msg = gss_pipe_destroy_msg, 1356 .release_pipe = gss_pipe_release, 1357}; 1358 1359/* 1360 * Initialize RPCSEC_GSS module 1361 */ 1362static int __init init_rpcsec_gss(void) 1363{ 1364 int err = 0; 1365 1366 err = rpcauth_register(&authgss_ops); 1367 if (err) 1368 goto out; 1369 err = gss_svc_init(); 1370 if (err) 1371 goto out_unregister; 1372 return 0; 1373out_unregister: 1374 rpcauth_unregister(&authgss_ops); 1375out: 1376 return err; 1377} 1378 1379static void __exit exit_rpcsec_gss(void) 1380{ 1381 gss_svc_shutdown(); 1382 rpcauth_unregister(&authgss_ops); 1383} 1384 1385MODULE_LICENSE("GPL"); 1386module_init(init_rpcsec_gss) 1387module_exit(exit_rpcsec_gss) 1388