1/* 2 * Neil Brown <neilb@cse.unsw.edu.au> 3 * J. Bruce Fields <bfields@umich.edu> 4 * Andy Adamson <andros@umich.edu> 5 * Dug Song <dugsong@monkey.org> 6 * 7 * RPCSEC_GSS server authentication. 8 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078 9 * (gssapi) 10 * 11 * The RPCSEC_GSS involves three stages: 12 * 1/ context creation 13 * 2/ data exchange 14 * 3/ context destruction 15 * 16 * Context creation is handled largely by upcalls to user-space. 17 * In particular, GSS_Accept_sec_context is handled by an upcall 18 * Data exchange is handled entirely within the kernel 19 * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel. 20 * Context destruction is handled in-kernel 21 * GSS_Delete_sec_context is in-kernel 22 * 23 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving. 24 * The context handle and gss_token are used as a key into the rpcsec_init cache. 25 * The content of this cache includes some of the outputs of GSS_Accept_sec_context, 26 * being major_status, minor_status, context_handle, reply_token. 27 * These are sent back to the client. 28 * Sequence window management is handled by the kernel. The window size if currently 29 * a compile time constant. 30 * 31 * When user-space is happy that a context is established, it places an entry 32 * in the rpcsec_context cache. The key for this cache is the context_handle. 33 * The content includes: 34 * uid/gidlist - for determining access rights 35 * mechanism type 36 * mechanism specific information, such as a key 37 * 38 */ 39 40#include <linux/types.h> 41#include <linux/module.h> 42#include <linux/pagemap.h> 43 44#include <linux/sunrpc/auth_gss.h> 45#include <linux/sunrpc/svcauth.h> 46#include <linux/sunrpc/gss_err.h> 47#include <linux/sunrpc/svcauth.h> 48#include <linux/sunrpc/svcauth_gss.h> 49#include <linux/sunrpc/cache.h> 50 51#ifdef RPC_DEBUG 52# define RPCDBG_FACILITY RPCDBG_AUTH 53#endif 54 55/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests 56 * into replies. 57 * 58 * Key is context handle (\x if empty) and gss_token. 59 * Content is major_status minor_status (integers) context_handle, reply_token. 60 * 61 */ 62 63static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) 64{ 65 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); 66} 67 68#define RSI_HASHBITS 6 69#define RSI_HASHMAX (1<<RSI_HASHBITS) 70#define RSI_HASHMASK (RSI_HASHMAX-1) 71 72struct rsi { 73 struct cache_head h; 74 struct xdr_netobj in_handle, in_token; 75 struct xdr_netobj out_handle, out_token; 76 int major_status, minor_status; 77}; 78 79static struct cache_head *rsi_table[RSI_HASHMAX]; 80static struct cache_detail rsi_cache; 81static struct rsi *rsi_update(struct rsi *new, struct rsi *old); 82static struct rsi *rsi_lookup(struct rsi *item); 83 84static void rsi_free(struct rsi *rsii) 85{ 86 kfree(rsii->in_handle.data); 87 kfree(rsii->in_token.data); 88 kfree(rsii->out_handle.data); 89 kfree(rsii->out_token.data); 90} 91 92static void rsi_put(struct kref *ref) 93{ 94 struct rsi *rsii = container_of(ref, struct rsi, h.ref); 95 rsi_free(rsii); 96 kfree(rsii); 97} 98 99static inline int rsi_hash(struct rsi *item) 100{ 101 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS) 102 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS); 103} 104 105static int rsi_match(struct cache_head *a, struct cache_head *b) 106{ 107 struct rsi *item = container_of(a, struct rsi, h); 108 struct rsi *tmp = container_of(b, struct rsi, h); 109 return netobj_equal(&item->in_handle, &tmp->in_handle) 110 && netobj_equal(&item->in_token, &tmp->in_token); 111} 112 113static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len) 114{ 115 dst->len = len; 116 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL); 117 if (len && !dst->data) 118 return -ENOMEM; 119 return 0; 120} 121 122static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src) 123{ 124 return dup_to_netobj(dst, src->data, src->len); 125} 126 127static void rsi_init(struct cache_head *cnew, struct cache_head *citem) 128{ 129 struct rsi *new = container_of(cnew, struct rsi, h); 130 struct rsi *item = container_of(citem, struct rsi, h); 131 132 new->out_handle.data = NULL; 133 new->out_handle.len = 0; 134 new->out_token.data = NULL; 135 new->out_token.len = 0; 136 new->in_handle.len = item->in_handle.len; 137 item->in_handle.len = 0; 138 new->in_token.len = item->in_token.len; 139 item->in_token.len = 0; 140 new->in_handle.data = item->in_handle.data; 141 item->in_handle.data = NULL; 142 new->in_token.data = item->in_token.data; 143 item->in_token.data = NULL; 144} 145 146static void update_rsi(struct cache_head *cnew, struct cache_head *citem) 147{ 148 struct rsi *new = container_of(cnew, struct rsi, h); 149 struct rsi *item = container_of(citem, struct rsi, h); 150 151 BUG_ON(new->out_handle.data || new->out_token.data); 152 new->out_handle.len = item->out_handle.len; 153 item->out_handle.len = 0; 154 new->out_token.len = item->out_token.len; 155 item->out_token.len = 0; 156 new->out_handle.data = item->out_handle.data; 157 item->out_handle.data = NULL; 158 new->out_token.data = item->out_token.data; 159 item->out_token.data = NULL; 160 161 new->major_status = item->major_status; 162 new->minor_status = item->minor_status; 163} 164 165static struct cache_head *rsi_alloc(void) 166{ 167 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL); 168 if (rsii) 169 return &rsii->h; 170 else 171 return NULL; 172} 173 174static void rsi_request(struct cache_detail *cd, 175 struct cache_head *h, 176 char **bpp, int *blen) 177{ 178 struct rsi *rsii = container_of(h, struct rsi, h); 179 180 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len); 181 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len); 182 (*bpp)[-1] = '\n'; 183} 184 185 186static int rsi_parse(struct cache_detail *cd, 187 char *mesg, int mlen) 188{ 189 /* context token expiry major minor context token */ 190 char *buf = mesg; 191 char *ep; 192 int len; 193 struct rsi rsii, *rsip = NULL; 194 time_t expiry; 195 int status = -EINVAL; 196 197 memset(&rsii, 0, sizeof(rsii)); 198 /* handle */ 199 len = qword_get(&mesg, buf, mlen); 200 if (len < 0) 201 goto out; 202 status = -ENOMEM; 203 if (dup_to_netobj(&rsii.in_handle, buf, len)) 204 goto out; 205 206 /* token */ 207 len = qword_get(&mesg, buf, mlen); 208 status = -EINVAL; 209 if (len < 0) 210 goto out; 211 status = -ENOMEM; 212 if (dup_to_netobj(&rsii.in_token, buf, len)) 213 goto out; 214 215 rsip = rsi_lookup(&rsii); 216 if (!rsip) 217 goto out; 218 219 rsii.h.flags = 0; 220 /* expiry */ 221 expiry = get_expiry(&mesg); 222 status = -EINVAL; 223 if (expiry == 0) 224 goto out; 225 226 /* major/minor */ 227 len = qword_get(&mesg, buf, mlen); 228 if (len < 0) 229 goto out; 230 if (len == 0) { 231 goto out; 232 } else { 233 rsii.major_status = simple_strtoul(buf, &ep, 10); 234 if (*ep) 235 goto out; 236 len = qword_get(&mesg, buf, mlen); 237 if (len <= 0) 238 goto out; 239 rsii.minor_status = simple_strtoul(buf, &ep, 10); 240 if (*ep) 241 goto out; 242 243 /* out_handle */ 244 len = qword_get(&mesg, buf, mlen); 245 if (len < 0) 246 goto out; 247 status = -ENOMEM; 248 if (dup_to_netobj(&rsii.out_handle, buf, len)) 249 goto out; 250 251 /* out_token */ 252 len = qword_get(&mesg, buf, mlen); 253 status = -EINVAL; 254 if (len < 0) 255 goto out; 256 status = -ENOMEM; 257 if (dup_to_netobj(&rsii.out_token, buf, len)) 258 goto out; 259 } 260 rsii.h.expiry_time = expiry; 261 rsip = rsi_update(&rsii, rsip); 262 status = 0; 263out: 264 rsi_free(&rsii); 265 if (rsip) 266 cache_put(&rsip->h, &rsi_cache); 267 else 268 status = -ENOMEM; 269 return status; 270} 271 272static struct cache_detail rsi_cache = { 273 .owner = THIS_MODULE, 274 .hash_size = RSI_HASHMAX, 275 .hash_table = rsi_table, 276 .name = "auth.rpcsec.init", 277 .cache_put = rsi_put, 278 .cache_request = rsi_request, 279 .cache_parse = rsi_parse, 280 .match = rsi_match, 281 .init = rsi_init, 282 .update = update_rsi, 283 .alloc = rsi_alloc, 284}; 285 286static struct rsi *rsi_lookup(struct rsi *item) 287{ 288 struct cache_head *ch; 289 int hash = rsi_hash(item); 290 291 ch = sunrpc_cache_lookup(&rsi_cache, &item->h, hash); 292 if (ch) 293 return container_of(ch, struct rsi, h); 294 else 295 return NULL; 296} 297 298static struct rsi *rsi_update(struct rsi *new, struct rsi *old) 299{ 300 struct cache_head *ch; 301 int hash = rsi_hash(new); 302 303 ch = sunrpc_cache_update(&rsi_cache, &new->h, 304 &old->h, hash); 305 if (ch) 306 return container_of(ch, struct rsi, h); 307 else 308 return NULL; 309} 310 311 312/* 313 * The rpcsec_context cache is used to store a context that is 314 * used in data exchange. 315 * The key is a context handle. The content is: 316 * uid, gidlist, mechanism, service-set, mech-specific-data 317 */ 318 319#define RSC_HASHBITS 10 320#define RSC_HASHMAX (1<<RSC_HASHBITS) 321#define RSC_HASHMASK (RSC_HASHMAX-1) 322 323#define GSS_SEQ_WIN 128 324 325struct gss_svc_seq_data { 326 /* highest seq number seen so far: */ 327 int sd_max; 328 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 329 * sd_win is nonzero iff sequence number i has been seen already: */ 330 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 331 spinlock_t sd_lock; 332}; 333 334struct rsc { 335 struct cache_head h; 336 struct xdr_netobj handle; 337 struct svc_cred cred; 338 struct gss_svc_seq_data seqdata; 339 struct gss_ctx *mechctx; 340}; 341 342static struct cache_head *rsc_table[RSC_HASHMAX]; 343static struct cache_detail rsc_cache; 344static struct rsc *rsc_update(struct rsc *new, struct rsc *old); 345static struct rsc *rsc_lookup(struct rsc *item); 346 347static void rsc_free(struct rsc *rsci) 348{ 349 kfree(rsci->handle.data); 350 if (rsci->mechctx) 351 gss_delete_sec_context(&rsci->mechctx); 352 if (rsci->cred.cr_group_info) 353 put_group_info(rsci->cred.cr_group_info); 354} 355 356static void rsc_put(struct kref *ref) 357{ 358 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 359 360 rsc_free(rsci); 361 kfree(rsci); 362} 363 364static inline int 365rsc_hash(struct rsc *rsci) 366{ 367 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 368} 369 370static int 371rsc_match(struct cache_head *a, struct cache_head *b) 372{ 373 struct rsc *new = container_of(a, struct rsc, h); 374 struct rsc *tmp = container_of(b, struct rsc, h); 375 376 return netobj_equal(&new->handle, &tmp->handle); 377} 378 379static void 380rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 381{ 382 struct rsc *new = container_of(cnew, struct rsc, h); 383 struct rsc *tmp = container_of(ctmp, struct rsc, h); 384 385 new->handle.len = tmp->handle.len; 386 tmp->handle.len = 0; 387 new->handle.data = tmp->handle.data; 388 tmp->handle.data = NULL; 389 new->mechctx = NULL; 390 new->cred.cr_group_info = NULL; 391} 392 393static void 394update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 395{ 396 struct rsc *new = container_of(cnew, struct rsc, h); 397 struct rsc *tmp = container_of(ctmp, struct rsc, h); 398 399 new->mechctx = tmp->mechctx; 400 tmp->mechctx = NULL; 401 memset(&new->seqdata, 0, sizeof(new->seqdata)); 402 spin_lock_init(&new->seqdata.sd_lock); 403 new->cred = tmp->cred; 404 tmp->cred.cr_group_info = NULL; 405} 406 407static struct cache_head * 408rsc_alloc(void) 409{ 410 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 411 if (rsci) 412 return &rsci->h; 413 else 414 return NULL; 415} 416 417static int rsc_parse(struct cache_detail *cd, 418 char *mesg, int mlen) 419{ 420 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 421 char *buf = mesg; 422 int len, rv; 423 struct rsc rsci, *rscp = NULL; 424 time_t expiry; 425 int status = -EINVAL; 426 struct gss_api_mech *gm = NULL; 427 428 memset(&rsci, 0, sizeof(rsci)); 429 /* context handle */ 430 len = qword_get(&mesg, buf, mlen); 431 if (len < 0) goto out; 432 status = -ENOMEM; 433 if (dup_to_netobj(&rsci.handle, buf, len)) 434 goto out; 435 436 rsci.h.flags = 0; 437 /* expiry */ 438 expiry = get_expiry(&mesg); 439 status = -EINVAL; 440 if (expiry == 0) 441 goto out; 442 443 rscp = rsc_lookup(&rsci); 444 if (!rscp) 445 goto out; 446 447 /* uid, or NEGATIVE */ 448 rv = get_int(&mesg, &rsci.cred.cr_uid); 449 if (rv == -EINVAL) 450 goto out; 451 if (rv == -ENOENT) 452 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 453 else { 454 int N, i; 455 456 /* gid */ 457 if (get_int(&mesg, &rsci.cred.cr_gid)) 458 goto out; 459 460 /* number of additional gid's */ 461 if (get_int(&mesg, &N)) 462 goto out; 463 status = -ENOMEM; 464 rsci.cred.cr_group_info = groups_alloc(N); 465 if (rsci.cred.cr_group_info == NULL) 466 goto out; 467 468 /* gid's */ 469 status = -EINVAL; 470 for (i=0; i<N; i++) { 471 gid_t gid; 472 if (get_int(&mesg, &gid)) 473 goto out; 474 GROUP_AT(rsci.cred.cr_group_info, i) = gid; 475 } 476 477 /* mech name */ 478 len = qword_get(&mesg, buf, mlen); 479 if (len < 0) 480 goto out; 481 gm = gss_mech_get_by_name(buf); 482 status = -EOPNOTSUPP; 483 if (!gm) 484 goto out; 485 486 status = -EINVAL; 487 /* mech-specific data: */ 488 len = qword_get(&mesg, buf, mlen); 489 if (len < 0) 490 goto out; 491 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx); 492 if (status) 493 goto out; 494 } 495 rsci.h.expiry_time = expiry; 496 rscp = rsc_update(&rsci, rscp); 497 status = 0; 498out: 499 gss_mech_put(gm); 500 rsc_free(&rsci); 501 if (rscp) 502 cache_put(&rscp->h, &rsc_cache); 503 else 504 status = -ENOMEM; 505 return status; 506} 507 508static struct cache_detail rsc_cache = { 509 .owner = THIS_MODULE, 510 .hash_size = RSC_HASHMAX, 511 .hash_table = rsc_table, 512 .name = "auth.rpcsec.context", 513 .cache_put = rsc_put, 514 .cache_parse = rsc_parse, 515 .match = rsc_match, 516 .init = rsc_init, 517 .update = update_rsc, 518 .alloc = rsc_alloc, 519}; 520 521static struct rsc *rsc_lookup(struct rsc *item) 522{ 523 struct cache_head *ch; 524 int hash = rsc_hash(item); 525 526 ch = sunrpc_cache_lookup(&rsc_cache, &item->h, hash); 527 if (ch) 528 return container_of(ch, struct rsc, h); 529 else 530 return NULL; 531} 532 533static struct rsc *rsc_update(struct rsc *new, struct rsc *old) 534{ 535 struct cache_head *ch; 536 int hash = rsc_hash(new); 537 538 ch = sunrpc_cache_update(&rsc_cache, &new->h, 539 &old->h, hash); 540 if (ch) 541 return container_of(ch, struct rsc, h); 542 else 543 return NULL; 544} 545 546 547static struct rsc * 548gss_svc_searchbyctx(struct xdr_netobj *handle) 549{ 550 struct rsc rsci; 551 struct rsc *found; 552 553 memset(&rsci, 0, sizeof(rsci)); 554 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 555 return NULL; 556 found = rsc_lookup(&rsci); 557 rsc_free(&rsci); 558 if (!found) 559 return NULL; 560 if (cache_check(&rsc_cache, &found->h, NULL)) 561 return NULL; 562 return found; 563} 564 565/* Implements sequence number algorithm as specified in RFC 2203. */ 566static int 567gss_check_seq_num(struct rsc *rsci, int seq_num) 568{ 569 struct gss_svc_seq_data *sd = &rsci->seqdata; 570 571 spin_lock(&sd->sd_lock); 572 if (seq_num > sd->sd_max) { 573 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 574 memset(sd->sd_win,0,sizeof(sd->sd_win)); 575 sd->sd_max = seq_num; 576 } else while (sd->sd_max < seq_num) { 577 sd->sd_max++; 578 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 579 } 580 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 581 goto ok; 582 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 583 goto drop; 584 } 585 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 586 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 587 goto drop; 588ok: 589 spin_unlock(&sd->sd_lock); 590 return 1; 591drop: 592 spin_unlock(&sd->sd_lock); 593 return 0; 594} 595 596static inline u32 round_up_to_quad(u32 i) 597{ 598 return (i + 3 ) & ~3; 599} 600 601static inline int 602svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 603{ 604 int l; 605 606 if (argv->iov_len < 4) 607 return -1; 608 o->len = svc_getnl(argv); 609 l = round_up_to_quad(o->len); 610 if (argv->iov_len < l) 611 return -1; 612 o->data = argv->iov_base; 613 argv->iov_base += l; 614 argv->iov_len -= l; 615 return 0; 616} 617 618static inline int 619svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 620{ 621 u8 *p; 622 623 if (resv->iov_len + 4 > PAGE_SIZE) 624 return -1; 625 svc_putnl(resv, o->len); 626 p = resv->iov_base + resv->iov_len; 627 resv->iov_len += round_up_to_quad(o->len); 628 if (resv->iov_len > PAGE_SIZE) 629 return -1; 630 memcpy(p, o->data, o->len); 631 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 632 return 0; 633} 634 635/* Verify the checksum on the header and return SVC_OK on success. 636 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 637 * or return SVC_DENIED and indicate error in authp. 638 */ 639static int 640gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 641 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 642{ 643 struct gss_ctx *ctx_id = rsci->mechctx; 644 struct xdr_buf rpchdr; 645 struct xdr_netobj checksum; 646 u32 flavor = 0; 647 struct kvec *argv = &rqstp->rq_arg.head[0]; 648 struct kvec iov; 649 650 /* data to compute the checksum over: */ 651 iov.iov_base = rpcstart; 652 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 653 xdr_buf_from_iov(&iov, &rpchdr); 654 655 *authp = rpc_autherr_badverf; 656 if (argv->iov_len < 4) 657 return SVC_DENIED; 658 flavor = svc_getnl(argv); 659 if (flavor != RPC_AUTH_GSS) 660 return SVC_DENIED; 661 if (svc_safe_getnetobj(argv, &checksum)) 662 return SVC_DENIED; 663 664 if (rqstp->rq_deferred) /* skip verification of revisited request */ 665 return SVC_OK; 666 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 667 *authp = rpcsec_gsserr_credproblem; 668 return SVC_DENIED; 669 } 670 671 if (gc->gc_seq > MAXSEQ) { 672 dprintk("RPC: svcauth_gss: discarding request with " 673 "large sequence number %d\n", gc->gc_seq); 674 *authp = rpcsec_gsserr_ctxproblem; 675 return SVC_DENIED; 676 } 677 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 678 dprintk("RPC: svcauth_gss: discarding request with " 679 "old sequence number %d\n", gc->gc_seq); 680 return SVC_DROP; 681 } 682 return SVC_OK; 683} 684 685static int 686gss_write_null_verf(struct svc_rqst *rqstp) 687{ 688 __be32 *p; 689 690 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 691 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 692 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 693 *p++ = 0; 694 if (!xdr_ressize_check(rqstp, p)) 695 return -1; 696 return 0; 697} 698 699static int 700gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 701{ 702 __be32 xdr_seq; 703 u32 maj_stat; 704 struct xdr_buf verf_data; 705 struct xdr_netobj mic; 706 __be32 *p; 707 struct kvec iov; 708 709 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 710 xdr_seq = htonl(seq); 711 712 iov.iov_base = &xdr_seq; 713 iov.iov_len = sizeof(xdr_seq); 714 xdr_buf_from_iov(&iov, &verf_data); 715 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 716 mic.data = (u8 *)(p + 1); 717 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 718 if (maj_stat != GSS_S_COMPLETE) 719 return -1; 720 *p++ = htonl(mic.len); 721 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 722 p += XDR_QUADLEN(mic.len); 723 if (!xdr_ressize_check(rqstp, p)) 724 return -1; 725 return 0; 726} 727 728struct gss_domain { 729 struct auth_domain h; 730 u32 pseudoflavor; 731}; 732 733static struct auth_domain * 734find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 735{ 736 char *name; 737 738 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 739 if (!name) 740 return NULL; 741 return auth_domain_find(name); 742} 743 744static struct auth_ops svcauthops_gss; 745 746int 747svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 748{ 749 struct gss_domain *new; 750 struct auth_domain *test; 751 int stat = -ENOMEM; 752 753 new = kmalloc(sizeof(*new), GFP_KERNEL); 754 if (!new) 755 goto out; 756 kref_init(&new->h.ref); 757 new->h.name = kstrdup(name, GFP_KERNEL); 758 if (!new->h.name) 759 goto out_free_dom; 760 new->h.flavour = &svcauthops_gss; 761 new->pseudoflavor = pseudoflavor; 762 763 test = auth_domain_lookup(name, &new->h); 764 if (test != &new->h) { 765 auth_domain_put(&new->h); 766 /* dangling ref-count... */ 767 goto out; 768 } 769 return 0; 770 771out_free_dom: 772 kfree(new); 773out: 774 return stat; 775} 776 777EXPORT_SYMBOL(svcauth_gss_register_pseudoflavor); 778 779static inline int 780read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 781{ 782 __be32 raw; 783 int status; 784 785 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 786 if (status) 787 return status; 788 *obj = ntohl(raw); 789 return 0; 790} 791 792/* It would be nice if this bit of code could be shared with the client. 793 * Obstacles: 794 * The client shouldn't malloc(), would have to pass in own memory. 795 * The server uses base of head iovec as read pointer, while the 796 * client uses separate pointer. */ 797static int 798unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 799{ 800 int stat = -EINVAL; 801 u32 integ_len, maj_stat; 802 struct xdr_netobj mic; 803 struct xdr_buf integ_buf; 804 805 integ_len = svc_getnl(&buf->head[0]); 806 if (integ_len & 3) 807 return stat; 808 if (integ_len > buf->len) 809 return stat; 810 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 811 BUG(); 812 /* copy out mic... */ 813 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 814 BUG(); 815 if (mic.len > RPC_MAX_AUTH_SIZE) 816 return stat; 817 mic.data = kmalloc(mic.len, GFP_KERNEL); 818 if (!mic.data) 819 return stat; 820 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 821 goto out; 822 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 823 if (maj_stat != GSS_S_COMPLETE) 824 goto out; 825 if (svc_getnl(&buf->head[0]) != seq) 826 goto out; 827 stat = 0; 828out: 829 kfree(mic.data); 830 return stat; 831} 832 833static inline int 834total_buf_len(struct xdr_buf *buf) 835{ 836 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 837} 838 839static void 840fix_priv_head(struct xdr_buf *buf, int pad) 841{ 842 if (buf->page_len == 0) { 843 /* We need to adjust head and buf->len in tandem in this 844 * case to make svc_defer() work--it finds the original 845 * buffer start using buf->len - buf->head[0].iov_len. */ 846 buf->head[0].iov_len -= pad; 847 } 848} 849 850static int 851unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 852{ 853 u32 priv_len, maj_stat; 854 int pad, saved_len, remaining_len, offset; 855 856 rqstp->rq_sendfile_ok = 0; 857 858 priv_len = svc_getnl(&buf->head[0]); 859 if (rqstp->rq_deferred) { 860 /* Already decrypted last time through! The sequence number 861 * check at out_seq is unnecessary but harmless: */ 862 goto out_seq; 863 } 864 /* buf->len is the number of bytes from the original start of the 865 * request to the end, where head[0].iov_len is just the bytes 866 * not yet read from the head, so these two values are different: */ 867 remaining_len = total_buf_len(buf); 868 if (priv_len > remaining_len) 869 return -EINVAL; 870 pad = remaining_len - priv_len; 871 buf->len -= pad; 872 fix_priv_head(buf, pad); 873 874 /* Maybe it would be better to give gss_unwrap a length parameter: */ 875 saved_len = buf->len; 876 buf->len = priv_len; 877 maj_stat = gss_unwrap(ctx, 0, buf); 878 pad = priv_len - buf->len; 879 buf->len = saved_len; 880 buf->len -= pad; 881 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 882 * In the krb5p case, at least, the data ends up offset, so we need to 883 * move it around. */ 884 offset = buf->head[0].iov_len % 4; 885 if (offset) { 886 buf->buflen = RPCSVC_MAXPAYLOAD; 887 xdr_shift_buf(buf, offset); 888 fix_priv_head(buf, pad); 889 } 890 if (maj_stat != GSS_S_COMPLETE) 891 return -EINVAL; 892out_seq: 893 if (svc_getnl(&buf->head[0]) != seq) 894 return -EINVAL; 895 return 0; 896} 897 898struct gss_svc_data { 899 /* decoded gss client cred: */ 900 struct rpc_gss_wire_cred clcred; 901 /* save a pointer to the beginning of the encoded verifier, 902 * for use in encryption/checksumming in svcauth_gss_release: */ 903 __be32 *verf_start; 904 struct rsc *rsci; 905}; 906 907static int 908svcauth_gss_set_client(struct svc_rqst *rqstp) 909{ 910 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 911 struct rsc *rsci = svcdata->rsci; 912 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 913 914 rqstp->rq_client = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 915 if (rqstp->rq_client == NULL) 916 return SVC_DENIED; 917 return SVC_OK; 918} 919 920static inline int 921gss_write_init_verf(struct svc_rqst *rqstp, struct rsi *rsip) 922{ 923 struct rsc *rsci; 924 int rc; 925 926 if (rsip->major_status != GSS_S_COMPLETE) 927 return gss_write_null_verf(rqstp); 928 rsci = gss_svc_searchbyctx(&rsip->out_handle); 929 if (rsci == NULL) { 930 rsip->major_status = GSS_S_NO_CONTEXT; 931 return gss_write_null_verf(rqstp); 932 } 933 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 934 cache_put(&rsci->h, &rsc_cache); 935 return rc; 936} 937 938/* 939 * Accept an rpcsec packet. 940 * If context establishment, punt to user space 941 * If data exchange, verify/decrypt 942 * If context destruction, handle here 943 * In the context establishment and destruction case we encode 944 * response here and return SVC_COMPLETE. 945 */ 946static int 947svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 948{ 949 struct kvec *argv = &rqstp->rq_arg.head[0]; 950 struct kvec *resv = &rqstp->rq_res.head[0]; 951 u32 crlen; 952 struct xdr_netobj tmpobj; 953 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 954 struct rpc_gss_wire_cred *gc; 955 struct rsc *rsci = NULL; 956 struct rsi *rsip, rsikey; 957 __be32 *rpcstart; 958 __be32 *reject_stat = resv->iov_base + resv->iov_len; 959 int ret; 960 961 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 962 argv->iov_len); 963 964 *authp = rpc_autherr_badcred; 965 if (!svcdata) 966 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 967 if (!svcdata) 968 goto auth_err; 969 rqstp->rq_auth_data = svcdata; 970 svcdata->verf_start = NULL; 971 svcdata->rsci = NULL; 972 gc = &svcdata->clcred; 973 974 /* start of rpc packet is 7 u32's back from here: 975 * xid direction rpcversion prog vers proc flavour 976 */ 977 rpcstart = argv->iov_base; 978 rpcstart -= 7; 979 980 /* credential is: 981 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 982 * at least 5 u32s, and is preceeded by length, so that makes 6. 983 */ 984 985 if (argv->iov_len < 5 * 4) 986 goto auth_err; 987 crlen = svc_getnl(argv); 988 if (svc_getnl(argv) != RPC_GSS_VERSION) 989 goto auth_err; 990 gc->gc_proc = svc_getnl(argv); 991 gc->gc_seq = svc_getnl(argv); 992 gc->gc_svc = svc_getnl(argv); 993 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 994 goto auth_err; 995 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 996 goto auth_err; 997 998 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 999 goto auth_err; 1000 1001 /* 1002 * We've successfully parsed the credential. Let's check out the 1003 * verifier. An AUTH_NULL verifier is allowed (and required) for 1004 * INIT and CONTINUE_INIT requests. AUTH_RPCSEC_GSS is required for 1005 * PROC_DATA and PROC_DESTROY. 1006 * 1007 * AUTH_NULL verifier is 0 (AUTH_NULL), 0 (length). 1008 * AUTH_RPCSEC_GSS verifier is: 1009 * 6 (AUTH_RPCSEC_GSS), length, checksum. 1010 * checksum is calculated over rpcheader from xid up to here. 1011 */ 1012 *authp = rpc_autherr_badverf; 1013 switch (gc->gc_proc) { 1014 case RPC_GSS_PROC_INIT: 1015 case RPC_GSS_PROC_CONTINUE_INIT: 1016 if (argv->iov_len < 2 * 4) 1017 goto auth_err; 1018 if (svc_getnl(argv) != RPC_AUTH_NULL) 1019 goto auth_err; 1020 if (svc_getnl(argv) != 0) 1021 goto auth_err; 1022 break; 1023 case RPC_GSS_PROC_DATA: 1024 case RPC_GSS_PROC_DESTROY: 1025 *authp = rpcsec_gsserr_credproblem; 1026 rsci = gss_svc_searchbyctx(&gc->gc_ctx); 1027 if (!rsci) 1028 goto auth_err; 1029 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1030 case SVC_OK: 1031 break; 1032 case SVC_DENIED: 1033 goto auth_err; 1034 case SVC_DROP: 1035 goto drop; 1036 } 1037 break; 1038 default: 1039 *authp = rpc_autherr_rejectedcred; 1040 goto auth_err; 1041 } 1042 1043 /* now act upon the command: */ 1044 switch (gc->gc_proc) { 1045 case RPC_GSS_PROC_INIT: 1046 case RPC_GSS_PROC_CONTINUE_INIT: 1047 *authp = rpc_autherr_badcred; 1048 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 1049 goto auth_err; 1050 memset(&rsikey, 0, sizeof(rsikey)); 1051 if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) 1052 goto drop; 1053 *authp = rpc_autherr_badverf; 1054 if (svc_safe_getnetobj(argv, &tmpobj)) { 1055 kfree(rsikey.in_handle.data); 1056 goto auth_err; 1057 } 1058 if (dup_netobj(&rsikey.in_token, &tmpobj)) { 1059 kfree(rsikey.in_handle.data); 1060 goto drop; 1061 } 1062 1063 rsip = rsi_lookup(&rsikey); 1064 rsi_free(&rsikey); 1065 if (!rsip) { 1066 goto drop; 1067 } 1068 switch(cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) { 1069 case -EAGAIN: 1070 case -ETIMEDOUT: 1071 case -ENOENT: 1072 goto drop; 1073 case 0: 1074 if (gss_write_init_verf(rqstp, rsip)) 1075 goto drop; 1076 if (resv->iov_len + 4 > PAGE_SIZE) 1077 goto drop; 1078 svc_putnl(resv, RPC_SUCCESS); 1079 if (svc_safe_putnetobj(resv, &rsip->out_handle)) 1080 goto drop; 1081 if (resv->iov_len + 3 * 4 > PAGE_SIZE) 1082 goto drop; 1083 svc_putnl(resv, rsip->major_status); 1084 svc_putnl(resv, rsip->minor_status); 1085 svc_putnl(resv, GSS_SEQ_WIN); 1086 if (svc_safe_putnetobj(resv, &rsip->out_token)) 1087 goto drop; 1088 rqstp->rq_client = NULL; 1089 } 1090 goto complete; 1091 case RPC_GSS_PROC_DESTROY: 1092 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1093 goto auth_err; 1094 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1095 if (resv->iov_len + 4 > PAGE_SIZE) 1096 goto drop; 1097 svc_putnl(resv, RPC_SUCCESS); 1098 goto complete; 1099 case RPC_GSS_PROC_DATA: 1100 *authp = rpcsec_gsserr_ctxproblem; 1101 svcdata->verf_start = resv->iov_base + resv->iov_len; 1102 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1103 goto auth_err; 1104 rqstp->rq_cred = rsci->cred; 1105 get_group_info(rsci->cred.cr_group_info); 1106 *authp = rpc_autherr_badcred; 1107 switch (gc->gc_svc) { 1108 case RPC_GSS_SVC_NONE: 1109 break; 1110 case RPC_GSS_SVC_INTEGRITY: 1111 if (unwrap_integ_data(&rqstp->rq_arg, 1112 gc->gc_seq, rsci->mechctx)) 1113 goto auth_err; 1114 /* placeholders for length and seq. number: */ 1115 svc_putnl(resv, 0); 1116 svc_putnl(resv, 0); 1117 break; 1118 case RPC_GSS_SVC_PRIVACY: 1119 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1120 gc->gc_seq, rsci->mechctx)) 1121 goto auth_err; 1122 /* placeholders for length and seq. number: */ 1123 svc_putnl(resv, 0); 1124 svc_putnl(resv, 0); 1125 break; 1126 default: 1127 goto auth_err; 1128 } 1129 svcdata->rsci = rsci; 1130 cache_get(&rsci->h); 1131 ret = SVC_OK; 1132 goto out; 1133 } 1134auth_err: 1135 /* Restore write pointer to original value: */ 1136 xdr_ressize_check(rqstp, reject_stat); 1137 ret = SVC_DENIED; 1138 goto out; 1139complete: 1140 ret = SVC_COMPLETE; 1141 goto out; 1142drop: 1143 ret = SVC_DROP; 1144out: 1145 if (rsci) 1146 cache_put(&rsci->h, &rsc_cache); 1147 return ret; 1148} 1149 1150static __be32 * 1151svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1152{ 1153 __be32 *p; 1154 u32 verf_len; 1155 1156 p = gsd->verf_start; 1157 gsd->verf_start = NULL; 1158 1159 /* If the reply stat is nonzero, don't wrap: */ 1160 if (*(p-1) != rpc_success) 1161 return NULL; 1162 /* Skip the verifier: */ 1163 p += 1; 1164 verf_len = ntohl(*p++); 1165 p += XDR_QUADLEN(verf_len); 1166 /* move accept_stat to right place: */ 1167 memcpy(p, p + 2, 4); 1168 /* Also don't wrap if the accept stat is nonzero: */ 1169 if (*p != rpc_success) { 1170 resbuf->head[0].iov_len -= 2 * 4; 1171 return NULL; 1172 } 1173 p++; 1174 return p; 1175} 1176 1177static inline int 1178svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1179{ 1180 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1181 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1182 struct xdr_buf *resbuf = &rqstp->rq_res; 1183 struct xdr_buf integ_buf; 1184 struct xdr_netobj mic; 1185 struct kvec *resv; 1186 __be32 *p; 1187 int integ_offset, integ_len; 1188 int stat = -EINVAL; 1189 1190 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1191 if (p == NULL) 1192 goto out; 1193 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1194 integ_len = resbuf->len - integ_offset; 1195 BUG_ON(integ_len % 4); 1196 *p++ = htonl(integ_len); 1197 *p++ = htonl(gc->gc_seq); 1198 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1199 integ_len)) 1200 BUG(); 1201 if (resbuf->tail[0].iov_base == NULL) { 1202 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1203 goto out_err; 1204 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1205 + resbuf->head[0].iov_len; 1206 resbuf->tail[0].iov_len = 0; 1207 resv = &resbuf->tail[0]; 1208 } else { 1209 resv = &resbuf->tail[0]; 1210 } 1211 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1212 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1213 goto out_err; 1214 svc_putnl(resv, mic.len); 1215 memset(mic.data + mic.len, 0, 1216 round_up_to_quad(mic.len) - mic.len); 1217 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1218 /* not strictly required: */ 1219 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1220 BUG_ON(resv->iov_len > PAGE_SIZE); 1221out: 1222 stat = 0; 1223out_err: 1224 return stat; 1225} 1226 1227static inline int 1228svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1229{ 1230 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1231 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1232 struct xdr_buf *resbuf = &rqstp->rq_res; 1233 struct page **inpages = NULL; 1234 __be32 *p, *len; 1235 int offset; 1236 int pad; 1237 1238 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1239 if (p == NULL) 1240 return 0; 1241 len = p++; 1242 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1243 *p++ = htonl(gc->gc_seq); 1244 inpages = resbuf->pages; 1245 if (resbuf->tail[0].iov_base) { 1246 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1247 + PAGE_SIZE); 1248 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1249 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1250 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1251 return -ENOMEM; 1252 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1253 resbuf->tail[0].iov_base, 1254 resbuf->tail[0].iov_len); 1255 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1256 } 1257 if (resbuf->tail[0].iov_base == NULL) { 1258 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1259 return -ENOMEM; 1260 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1261 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1262 resbuf->tail[0].iov_len = 0; 1263 } 1264 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1265 return -ENOMEM; 1266 *len = htonl(resbuf->len - offset); 1267 pad = 3 - ((resbuf->len - offset - 1)&3); 1268 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1269 memset(p, 0, pad); 1270 resbuf->tail[0].iov_len += pad; 1271 resbuf->len += pad; 1272 return 0; 1273} 1274 1275static int 1276svcauth_gss_release(struct svc_rqst *rqstp) 1277{ 1278 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1279 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1280 struct xdr_buf *resbuf = &rqstp->rq_res; 1281 int stat = -EINVAL; 1282 1283 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1284 goto out; 1285 /* Release can be called twice, but we only wrap once. */ 1286 if (gsd->verf_start == NULL) 1287 goto out; 1288 /* normally not set till svc_send, but we need it here: */ 1289 resbuf->len = total_buf_len(resbuf); 1290 switch (gc->gc_svc) { 1291 case RPC_GSS_SVC_NONE: 1292 break; 1293 case RPC_GSS_SVC_INTEGRITY: 1294 stat = svcauth_gss_wrap_resp_integ(rqstp); 1295 if (stat) 1296 goto out_err; 1297 break; 1298 case RPC_GSS_SVC_PRIVACY: 1299 stat = svcauth_gss_wrap_resp_priv(rqstp); 1300 if (stat) 1301 goto out_err; 1302 break; 1303 default: 1304 goto out_err; 1305 } 1306 1307out: 1308 stat = 0; 1309out_err: 1310 if (rqstp->rq_client) 1311 auth_domain_put(rqstp->rq_client); 1312 rqstp->rq_client = NULL; 1313 if (rqstp->rq_cred.cr_group_info) 1314 put_group_info(rqstp->rq_cred.cr_group_info); 1315 rqstp->rq_cred.cr_group_info = NULL; 1316 if (gsd->rsci) 1317 cache_put(&gsd->rsci->h, &rsc_cache); 1318 gsd->rsci = NULL; 1319 1320 return stat; 1321} 1322 1323static void 1324svcauth_gss_domain_release(struct auth_domain *dom) 1325{ 1326 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1327 1328 kfree(dom->name); 1329 kfree(gd); 1330} 1331 1332static struct auth_ops svcauthops_gss = { 1333 .name = "rpcsec_gss", 1334 .owner = THIS_MODULE, 1335 .flavour = RPC_AUTH_GSS, 1336 .accept = svcauth_gss_accept, 1337 .release = svcauth_gss_release, 1338 .domain_release = svcauth_gss_domain_release, 1339 .set_client = svcauth_gss_set_client, 1340}; 1341 1342int 1343gss_svc_init(void) 1344{ 1345 int rv = svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1346 if (rv == 0) { 1347 cache_register(&rsc_cache); 1348 cache_register(&rsi_cache); 1349 } 1350 return rv; 1351} 1352 1353void 1354gss_svc_shutdown(void) 1355{ 1356 if (cache_unregister(&rsc_cache)) 1357 printk(KERN_ERR "auth_rpcgss: failed to unregister rsc cache\n"); 1358 if (cache_unregister(&rsi_cache)) 1359 printk(KERN_ERR "auth_rpcgss: failed to unregister rsi cache\n"); 1360 svc_auth_unregister(RPC_AUTH_GSS); 1361} 1362