1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Neil Brown <neilb@cse.unsw.edu.au> 4 * J. Bruce Fields <bfields@umich.edu> 5 * Andy Adamson <andros@umich.edu> 6 * Dug Song <dugsong@monkey.org> 7 * 8 * RPCSEC_GSS server authentication. 9 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078 10 * (gssapi) 11 * 12 * The RPCSEC_GSS involves three stages: 13 * 1/ context creation 14 * 2/ data exchange 15 * 3/ context destruction 16 * 17 * Context creation is handled largely by upcalls to user-space. 18 * In particular, GSS_Accept_sec_context is handled by an upcall 19 * Data exchange is handled entirely within the kernel 20 * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel. 21 * Context destruction is handled in-kernel 22 * GSS_Delete_sec_context is in-kernel 23 * 24 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving. 25 * The context handle and gss_token are used as a key into the rpcsec_init cache. 26 * The content of this cache includes some of the outputs of GSS_Accept_sec_context, 27 * being major_status, minor_status, context_handle, reply_token. 28 * These are sent back to the client. 29 * Sequence window management is handled by the kernel. The window size if currently 30 * a compile time constant. 31 * 32 * When user-space is happy that a context is established, it places an entry 33 * in the rpcsec_context cache. The key for this cache is the context_handle. 34 * The content includes: 35 * uid/gidlist - for determining access rights 36 * mechanism type 37 * mechanism specific information, such as a key 38 * 39 */ 40 41 #include <linux/slab.h> 42 #include <linux/types.h> 43 #include <linux/module.h> 44 #include <linux/pagemap.h> 45 #include <linux/user_namespace.h> 46 47 #include <linux/sunrpc/auth_gss.h> 48 #include <linux/sunrpc/gss_err.h> 49 #include <linux/sunrpc/svcauth.h> 50 #include <linux/sunrpc/svcauth_gss.h> 51 #include <linux/sunrpc/cache.h> 52 #include <linux/sunrpc/gss_krb5.h> 53 54 #include <trace/events/rpcgss.h> 55 56 #include "gss_rpc_upcall.h" 57 58 /* 59 * Unfortunately there isn't a maximum checksum size exported via the 60 * GSS API. Manufacture one based on GSS mechanisms supported by this 61 * implementation. 62 */ 63 #define GSS_MAX_CKSUMSIZE (GSS_KRB5_TOK_HDR_LEN + GSS_KRB5_MAX_CKSUM_LEN) 64 65 /* 66 * This value may be increased in the future to accommodate other 67 * usage of the scratch buffer. 68 */ 69 #define GSS_SCRATCH_SIZE GSS_MAX_CKSUMSIZE 70 71 struct gss_svc_data { 72 /* decoded gss client cred: */ 73 struct rpc_gss_wire_cred clcred; 74 /* save a pointer to the beginning of the encoded verifier, 75 * for use in encryption/checksumming in svcauth_gss_release: */ 76 __be32 *verf_start; 77 struct rsc *rsci; 78 79 /* for temporary results */ 80 u8 gsd_scratch[GSS_SCRATCH_SIZE]; 81 }; 82 83 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests 84 * into replies. 85 * 86 * Key is context handle (\x if empty) and gss_token. 87 * Content is major_status minor_status (integers) context_handle, reply_token. 88 * 89 */ 90 91 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) 92 { 93 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); 94 } 95 96 #define RSI_HASHBITS 6 97 #define RSI_HASHMAX (1<<RSI_HASHBITS) 98 99 struct rsi { 100 struct cache_head h; 101 struct xdr_netobj in_handle, in_token; 102 struct xdr_netobj out_handle, out_token; 103 int major_status, minor_status; 104 struct rcu_head rcu_head; 105 }; 106 107 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old); 108 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item); 109 110 static void rsi_free(struct rsi *rsii) 111 { 112 kfree(rsii->in_handle.data); 113 kfree(rsii->in_token.data); 114 kfree(rsii->out_handle.data); 115 kfree(rsii->out_token.data); 116 } 117 118 static void rsi_free_rcu(struct rcu_head *head) 119 { 120 struct rsi *rsii = container_of(head, struct rsi, rcu_head); 121 122 rsi_free(rsii); 123 kfree(rsii); 124 } 125 126 static void rsi_put(struct kref *ref) 127 { 128 struct rsi *rsii = container_of(ref, struct rsi, h.ref); 129 130 call_rcu(&rsii->rcu_head, rsi_free_rcu); 131 } 132 133 static inline int rsi_hash(struct rsi *item) 134 { 135 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS) 136 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS); 137 } 138 139 static int rsi_match(struct cache_head *a, struct cache_head *b) 140 { 141 struct rsi *item = container_of(a, struct rsi, h); 142 struct rsi *tmp = container_of(b, struct rsi, h); 143 return netobj_equal(&item->in_handle, &tmp->in_handle) && 144 netobj_equal(&item->in_token, &tmp->in_token); 145 } 146 147 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len) 148 { 149 dst->len = len; 150 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL); 151 if (len && !dst->data) 152 return -ENOMEM; 153 return 0; 154 } 155 156 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src) 157 { 158 return dup_to_netobj(dst, src->data, src->len); 159 } 160 161 static void rsi_init(struct cache_head *cnew, struct cache_head *citem) 162 { 163 struct rsi *new = container_of(cnew, struct rsi, h); 164 struct rsi *item = container_of(citem, struct rsi, h); 165 166 new->out_handle.data = NULL; 167 new->out_handle.len = 0; 168 new->out_token.data = NULL; 169 new->out_token.len = 0; 170 new->in_handle.len = item->in_handle.len; 171 item->in_handle.len = 0; 172 new->in_token.len = item->in_token.len; 173 item->in_token.len = 0; 174 new->in_handle.data = item->in_handle.data; 175 item->in_handle.data = NULL; 176 new->in_token.data = item->in_token.data; 177 item->in_token.data = NULL; 178 } 179 180 static void update_rsi(struct cache_head *cnew, struct cache_head *citem) 181 { 182 struct rsi *new = container_of(cnew, struct rsi, h); 183 struct rsi *item = container_of(citem, struct rsi, h); 184 185 BUG_ON(new->out_handle.data || new->out_token.data); 186 new->out_handle.len = item->out_handle.len; 187 item->out_handle.len = 0; 188 new->out_token.len = item->out_token.len; 189 item->out_token.len = 0; 190 new->out_handle.data = item->out_handle.data; 191 item->out_handle.data = NULL; 192 new->out_token.data = item->out_token.data; 193 item->out_token.data = NULL; 194 195 new->major_status = item->major_status; 196 new->minor_status = item->minor_status; 197 } 198 199 static struct cache_head *rsi_alloc(void) 200 { 201 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL); 202 if (rsii) 203 return &rsii->h; 204 else 205 return NULL; 206 } 207 208 static int rsi_upcall(struct cache_detail *cd, struct cache_head *h) 209 { 210 return sunrpc_cache_pipe_upcall_timeout(cd, h); 211 } 212 213 static void rsi_request(struct cache_detail *cd, 214 struct cache_head *h, 215 char **bpp, int *blen) 216 { 217 struct rsi *rsii = container_of(h, struct rsi, h); 218 219 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len); 220 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len); 221 (*bpp)[-1] = '\n'; 222 WARN_ONCE(*blen < 0, 223 "RPCSEC/GSS credential too large - please use gssproxy\n"); 224 } 225 226 static int rsi_parse(struct cache_detail *cd, 227 char *mesg, int mlen) 228 { 229 /* context token expiry major minor context token */ 230 char *buf = mesg; 231 char *ep; 232 int len; 233 struct rsi rsii, *rsip = NULL; 234 time64_t expiry; 235 int status = -EINVAL; 236 237 memset(&rsii, 0, sizeof(rsii)); 238 /* handle */ 239 len = qword_get(&mesg, buf, mlen); 240 if (len < 0) 241 goto out; 242 status = -ENOMEM; 243 if (dup_to_netobj(&rsii.in_handle, buf, len)) 244 goto out; 245 246 /* token */ 247 len = qword_get(&mesg, buf, mlen); 248 status = -EINVAL; 249 if (len < 0) 250 goto out; 251 status = -ENOMEM; 252 if (dup_to_netobj(&rsii.in_token, buf, len)) 253 goto out; 254 255 rsip = rsi_lookup(cd, &rsii); 256 if (!rsip) 257 goto out; 258 259 rsii.h.flags = 0; 260 /* expiry */ 261 expiry = get_expiry(&mesg); 262 status = -EINVAL; 263 if (expiry == 0) 264 goto out; 265 266 /* major/minor */ 267 len = qword_get(&mesg, buf, mlen); 268 if (len <= 0) 269 goto out; 270 rsii.major_status = simple_strtoul(buf, &ep, 10); 271 if (*ep) 272 goto out; 273 len = qword_get(&mesg, buf, mlen); 274 if (len <= 0) 275 goto out; 276 rsii.minor_status = simple_strtoul(buf, &ep, 10); 277 if (*ep) 278 goto out; 279 280 /* out_handle */ 281 len = qword_get(&mesg, buf, mlen); 282 if (len < 0) 283 goto out; 284 status = -ENOMEM; 285 if (dup_to_netobj(&rsii.out_handle, buf, len)) 286 goto out; 287 288 /* out_token */ 289 len = qword_get(&mesg, buf, mlen); 290 status = -EINVAL; 291 if (len < 0) 292 goto out; 293 status = -ENOMEM; 294 if (dup_to_netobj(&rsii.out_token, buf, len)) 295 goto out; 296 rsii.h.expiry_time = expiry; 297 rsip = rsi_update(cd, &rsii, rsip); 298 status = 0; 299 out: 300 rsi_free(&rsii); 301 if (rsip) 302 cache_put(&rsip->h, cd); 303 else 304 status = -ENOMEM; 305 return status; 306 } 307 308 static const struct cache_detail rsi_cache_template = { 309 .owner = THIS_MODULE, 310 .hash_size = RSI_HASHMAX, 311 .name = "auth.rpcsec.init", 312 .cache_put = rsi_put, 313 .cache_upcall = rsi_upcall, 314 .cache_request = rsi_request, 315 .cache_parse = rsi_parse, 316 .match = rsi_match, 317 .init = rsi_init, 318 .update = update_rsi, 319 .alloc = rsi_alloc, 320 }; 321 322 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item) 323 { 324 struct cache_head *ch; 325 int hash = rsi_hash(item); 326 327 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash); 328 if (ch) 329 return container_of(ch, struct rsi, h); 330 else 331 return NULL; 332 } 333 334 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old) 335 { 336 struct cache_head *ch; 337 int hash = rsi_hash(new); 338 339 ch = sunrpc_cache_update(cd, &new->h, 340 &old->h, hash); 341 if (ch) 342 return container_of(ch, struct rsi, h); 343 else 344 return NULL; 345 } 346 347 348 /* 349 * The rpcsec_context cache is used to store a context that is 350 * used in data exchange. 351 * The key is a context handle. The content is: 352 * uid, gidlist, mechanism, service-set, mech-specific-data 353 */ 354 355 #define RSC_HASHBITS 10 356 #define RSC_HASHMAX (1<<RSC_HASHBITS) 357 358 #define GSS_SEQ_WIN 128 359 360 struct gss_svc_seq_data { 361 /* highest seq number seen so far: */ 362 u32 sd_max; 363 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 364 * sd_win is nonzero iff sequence number i has been seen already: */ 365 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 366 spinlock_t sd_lock; 367 }; 368 369 struct rsc { 370 struct cache_head h; 371 struct xdr_netobj handle; 372 struct svc_cred cred; 373 struct gss_svc_seq_data seqdata; 374 struct gss_ctx *mechctx; 375 struct rcu_head rcu_head; 376 }; 377 378 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old); 379 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item); 380 381 static void rsc_free(struct rsc *rsci) 382 { 383 kfree(rsci->handle.data); 384 if (rsci->mechctx) 385 gss_delete_sec_context(&rsci->mechctx); 386 free_svc_cred(&rsci->cred); 387 } 388 389 static void rsc_free_rcu(struct rcu_head *head) 390 { 391 struct rsc *rsci = container_of(head, struct rsc, rcu_head); 392 393 kfree(rsci->handle.data); 394 kfree(rsci); 395 } 396 397 static void rsc_put(struct kref *ref) 398 { 399 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 400 401 if (rsci->mechctx) 402 gss_delete_sec_context(&rsci->mechctx); 403 free_svc_cred(&rsci->cred); 404 call_rcu(&rsci->rcu_head, rsc_free_rcu); 405 } 406 407 static inline int 408 rsc_hash(struct rsc *rsci) 409 { 410 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 411 } 412 413 static int 414 rsc_match(struct cache_head *a, struct cache_head *b) 415 { 416 struct rsc *new = container_of(a, struct rsc, h); 417 struct rsc *tmp = container_of(b, struct rsc, h); 418 419 return netobj_equal(&new->handle, &tmp->handle); 420 } 421 422 static void 423 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 424 { 425 struct rsc *new = container_of(cnew, struct rsc, h); 426 struct rsc *tmp = container_of(ctmp, struct rsc, h); 427 428 new->handle.len = tmp->handle.len; 429 tmp->handle.len = 0; 430 new->handle.data = tmp->handle.data; 431 tmp->handle.data = NULL; 432 new->mechctx = NULL; 433 init_svc_cred(&new->cred); 434 } 435 436 static void 437 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 438 { 439 struct rsc *new = container_of(cnew, struct rsc, h); 440 struct rsc *tmp = container_of(ctmp, struct rsc, h); 441 442 new->mechctx = tmp->mechctx; 443 tmp->mechctx = NULL; 444 memset(&new->seqdata, 0, sizeof(new->seqdata)); 445 spin_lock_init(&new->seqdata.sd_lock); 446 new->cred = tmp->cred; 447 init_svc_cred(&tmp->cred); 448 } 449 450 static struct cache_head * 451 rsc_alloc(void) 452 { 453 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 454 if (rsci) 455 return &rsci->h; 456 else 457 return NULL; 458 } 459 460 static int rsc_upcall(struct cache_detail *cd, struct cache_head *h) 461 { 462 return -EINVAL; 463 } 464 465 static int rsc_parse(struct cache_detail *cd, 466 char *mesg, int mlen) 467 { 468 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 469 char *buf = mesg; 470 int id; 471 int len, rv; 472 struct rsc rsci, *rscp = NULL; 473 time64_t expiry; 474 int status = -EINVAL; 475 struct gss_api_mech *gm = NULL; 476 477 memset(&rsci, 0, sizeof(rsci)); 478 /* context handle */ 479 len = qword_get(&mesg, buf, mlen); 480 if (len < 0) goto out; 481 status = -ENOMEM; 482 if (dup_to_netobj(&rsci.handle, buf, len)) 483 goto out; 484 485 rsci.h.flags = 0; 486 /* expiry */ 487 expiry = get_expiry(&mesg); 488 status = -EINVAL; 489 if (expiry == 0) 490 goto out; 491 492 rscp = rsc_lookup(cd, &rsci); 493 if (!rscp) 494 goto out; 495 496 /* uid, or NEGATIVE */ 497 rv = get_int(&mesg, &id); 498 if (rv == -EINVAL) 499 goto out; 500 if (rv == -ENOENT) 501 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 502 else { 503 int N, i; 504 505 /* 506 * NOTE: we skip uid_valid()/gid_valid() checks here: 507 * instead, * -1 id's are later mapped to the 508 * (export-specific) anonymous id by nfsd_setuser. 509 * 510 * (But supplementary gid's get no such special 511 * treatment so are checked for validity here.) 512 */ 513 /* uid */ 514 rsci.cred.cr_uid = make_kuid(current_user_ns(), id); 515 516 /* gid */ 517 if (get_int(&mesg, &id)) 518 goto out; 519 rsci.cred.cr_gid = make_kgid(current_user_ns(), id); 520 521 /* number of additional gid's */ 522 if (get_int(&mesg, &N)) 523 goto out; 524 if (N < 0 || N > NGROUPS_MAX) 525 goto out; 526 status = -ENOMEM; 527 rsci.cred.cr_group_info = groups_alloc(N); 528 if (rsci.cred.cr_group_info == NULL) 529 goto out; 530 531 /* gid's */ 532 status = -EINVAL; 533 for (i=0; i<N; i++) { 534 kgid_t kgid; 535 if (get_int(&mesg, &id)) 536 goto out; 537 kgid = make_kgid(current_user_ns(), id); 538 if (!gid_valid(kgid)) 539 goto out; 540 rsci.cred.cr_group_info->gid[i] = kgid; 541 } 542 groups_sort(rsci.cred.cr_group_info); 543 544 /* mech name */ 545 len = qword_get(&mesg, buf, mlen); 546 if (len < 0) 547 goto out; 548 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf); 549 status = -EOPNOTSUPP; 550 if (!gm) 551 goto out; 552 553 status = -EINVAL; 554 /* mech-specific data: */ 555 len = qword_get(&mesg, buf, mlen); 556 if (len < 0) 557 goto out; 558 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, 559 NULL, GFP_KERNEL); 560 if (status) 561 goto out; 562 563 /* get client name */ 564 len = qword_get(&mesg, buf, mlen); 565 if (len > 0) { 566 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL); 567 if (!rsci.cred.cr_principal) { 568 status = -ENOMEM; 569 goto out; 570 } 571 } 572 573 } 574 rsci.h.expiry_time = expiry; 575 rscp = rsc_update(cd, &rsci, rscp); 576 status = 0; 577 out: 578 rsc_free(&rsci); 579 if (rscp) 580 cache_put(&rscp->h, cd); 581 else 582 status = -ENOMEM; 583 return status; 584 } 585 586 static const struct cache_detail rsc_cache_template = { 587 .owner = THIS_MODULE, 588 .hash_size = RSC_HASHMAX, 589 .name = "auth.rpcsec.context", 590 .cache_put = rsc_put, 591 .cache_upcall = rsc_upcall, 592 .cache_parse = rsc_parse, 593 .match = rsc_match, 594 .init = rsc_init, 595 .update = update_rsc, 596 .alloc = rsc_alloc, 597 }; 598 599 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) 600 { 601 struct cache_head *ch; 602 int hash = rsc_hash(item); 603 604 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash); 605 if (ch) 606 return container_of(ch, struct rsc, h); 607 else 608 return NULL; 609 } 610 611 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) 612 { 613 struct cache_head *ch; 614 int hash = rsc_hash(new); 615 616 ch = sunrpc_cache_update(cd, &new->h, 617 &old->h, hash); 618 if (ch) 619 return container_of(ch, struct rsc, h); 620 else 621 return NULL; 622 } 623 624 625 static struct rsc * 626 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) 627 { 628 struct rsc rsci; 629 struct rsc *found; 630 631 memset(&rsci, 0, sizeof(rsci)); 632 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 633 return NULL; 634 found = rsc_lookup(cd, &rsci); 635 rsc_free(&rsci); 636 if (!found) 637 return NULL; 638 if (cache_check(cd, &found->h, NULL)) 639 return NULL; 640 return found; 641 } 642 643 /** 644 * gss_check_seq_num - GSS sequence number window check 645 * @rqstp: RPC Call to use when reporting errors 646 * @rsci: cached GSS context state (updated on return) 647 * @seq_num: sequence number to check 648 * 649 * Implements sequence number algorithm as specified in 650 * RFC 2203, Section 5.3.3.1. "Context Management". 651 * 652 * Return values: 653 * %true: @rqstp's GSS sequence number is inside the window 654 * %false: @rqstp's GSS sequence number is outside the window 655 */ 656 static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci, 657 u32 seq_num) 658 { 659 struct gss_svc_seq_data *sd = &rsci->seqdata; 660 bool result = false; 661 662 spin_lock(&sd->sd_lock); 663 if (seq_num > sd->sd_max) { 664 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 665 memset(sd->sd_win, 0, sizeof(sd->sd_win)); 666 sd->sd_max = seq_num; 667 } else while (sd->sd_max < seq_num) { 668 sd->sd_max++; 669 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 670 } 671 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 672 goto ok; 673 } else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) { 674 goto toolow; 675 } 676 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 677 goto alreadyseen; 678 679 ok: 680 result = true; 681 out: 682 spin_unlock(&sd->sd_lock); 683 return result; 684 685 toolow: 686 trace_rpcgss_svc_seqno_low(rqstp, seq_num, 687 sd->sd_max - GSS_SEQ_WIN, 688 sd->sd_max); 689 goto out; 690 alreadyseen: 691 trace_rpcgss_svc_seqno_seen(rqstp, seq_num); 692 goto out; 693 } 694 695 static inline u32 round_up_to_quad(u32 i) 696 { 697 return (i + 3 ) & ~3; 698 } 699 700 static inline int 701 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 702 { 703 int l; 704 705 if (argv->iov_len < 4) 706 return -1; 707 o->len = svc_getnl(argv); 708 l = round_up_to_quad(o->len); 709 if (argv->iov_len < l) 710 return -1; 711 o->data = argv->iov_base; 712 argv->iov_base += l; 713 argv->iov_len -= l; 714 return 0; 715 } 716 717 static inline int 718 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 719 { 720 u8 *p; 721 722 if (resv->iov_len + 4 > PAGE_SIZE) 723 return -1; 724 svc_putnl(resv, o->len); 725 p = resv->iov_base + resv->iov_len; 726 resv->iov_len += round_up_to_quad(o->len); 727 if (resv->iov_len > PAGE_SIZE) 728 return -1; 729 memcpy(p, o->data, o->len); 730 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 731 return 0; 732 } 733 734 /* 735 * Decode and verify a Call's verifier field. For RPC_AUTH_GSS Calls, 736 * the body of this field contains a variable length checksum. 737 * 738 * GSS-specific auth_stat values are mandated by RFC 2203 Section 739 * 5.3.3.3. 740 */ 741 static int 742 svcauth_gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 743 __be32 *rpcstart, struct rpc_gss_wire_cred *gc) 744 { 745 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 746 struct gss_ctx *ctx_id = rsci->mechctx; 747 u32 flavor, maj_stat; 748 struct xdr_buf rpchdr; 749 struct xdr_netobj checksum; 750 struct kvec iov; 751 752 /* 753 * Compute the checksum of the incoming Call from the 754 * XID field to credential field: 755 */ 756 iov.iov_base = rpcstart; 757 iov.iov_len = (u8 *)xdr->p - (u8 *)rpcstart; 758 xdr_buf_from_iov(&iov, &rpchdr); 759 760 /* Call's verf field: */ 761 if (xdr_stream_decode_opaque_auth(xdr, &flavor, 762 (void **)&checksum.data, 763 &checksum.len) < 0) { 764 rqstp->rq_auth_stat = rpc_autherr_badverf; 765 return SVC_DENIED; 766 } 767 if (flavor != RPC_AUTH_GSS) { 768 rqstp->rq_auth_stat = rpc_autherr_badverf; 769 return SVC_DENIED; 770 } 771 772 if (rqstp->rq_deferred) 773 return SVC_OK; 774 maj_stat = gss_verify_mic(ctx_id, &rpchdr, &checksum); 775 if (maj_stat != GSS_S_COMPLETE) { 776 trace_rpcgss_svc_mic(rqstp, maj_stat); 777 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem; 778 return SVC_DENIED; 779 } 780 781 if (gc->gc_seq > MAXSEQ) { 782 trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq); 783 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem; 784 return SVC_DENIED; 785 } 786 if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq)) 787 return SVC_DROP; 788 return SVC_OK; 789 } 790 791 static int 792 gss_write_null_verf(struct svc_rqst *rqstp) 793 { 794 __be32 *p; 795 796 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 797 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 798 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 799 *p++ = 0; 800 if (!xdr_ressize_check(rqstp, p)) 801 return -1; 802 return 0; 803 } 804 805 static int 806 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 807 { 808 __be32 *xdr_seq; 809 u32 maj_stat; 810 struct xdr_buf verf_data; 811 struct xdr_netobj mic; 812 __be32 *p; 813 struct kvec iov; 814 int err = -1; 815 816 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 817 xdr_seq = kmalloc(4, GFP_KERNEL); 818 if (!xdr_seq) 819 return -ENOMEM; 820 *xdr_seq = htonl(seq); 821 822 iov.iov_base = xdr_seq; 823 iov.iov_len = 4; 824 xdr_buf_from_iov(&iov, &verf_data); 825 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 826 mic.data = (u8 *)(p + 1); 827 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 828 if (maj_stat != GSS_S_COMPLETE) 829 goto out; 830 *p++ = htonl(mic.len); 831 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 832 p += XDR_QUADLEN(mic.len); 833 if (!xdr_ressize_check(rqstp, p)) 834 goto out; 835 err = 0; 836 out: 837 kfree(xdr_seq); 838 return err; 839 } 840 841 struct gss_domain { 842 struct auth_domain h; 843 u32 pseudoflavor; 844 }; 845 846 static struct auth_domain * 847 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 848 { 849 char *name; 850 851 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 852 if (!name) 853 return NULL; 854 return auth_domain_find(name); 855 } 856 857 static struct auth_ops svcauthops_gss; 858 859 u32 svcauth_gss_flavor(struct auth_domain *dom) 860 { 861 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 862 863 return gd->pseudoflavor; 864 } 865 866 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 867 868 struct auth_domain * 869 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 870 { 871 struct gss_domain *new; 872 struct auth_domain *test; 873 int stat = -ENOMEM; 874 875 new = kmalloc(sizeof(*new), GFP_KERNEL); 876 if (!new) 877 goto out; 878 kref_init(&new->h.ref); 879 new->h.name = kstrdup(name, GFP_KERNEL); 880 if (!new->h.name) 881 goto out_free_dom; 882 new->h.flavour = &svcauthops_gss; 883 new->pseudoflavor = pseudoflavor; 884 885 test = auth_domain_lookup(name, &new->h); 886 if (test != &new->h) { 887 pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n", 888 name); 889 stat = -EADDRINUSE; 890 auth_domain_put(test); 891 goto out_free_name; 892 } 893 return test; 894 895 out_free_name: 896 kfree(new->h.name); 897 out_free_dom: 898 kfree(new); 899 out: 900 return ERR_PTR(stat); 901 } 902 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 903 904 /* 905 * RFC 2203, Section 5.3.2.2 906 * 907 * struct rpc_gss_integ_data { 908 * opaque databody_integ<>; 909 * opaque checksum<>; 910 * }; 911 * 912 * struct rpc_gss_data_t { 913 * unsigned int seq_num; 914 * proc_req_arg_t arg; 915 * }; 916 */ 917 static noinline_for_stack int 918 svcauth_gss_unwrap_integ(struct svc_rqst *rqstp, u32 seq, struct gss_ctx *ctx) 919 { 920 struct gss_svc_data *gsd = rqstp->rq_auth_data; 921 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 922 u32 len, offset, seq_num, maj_stat; 923 struct xdr_buf *buf = xdr->buf; 924 struct xdr_buf databody_integ; 925 struct xdr_netobj checksum; 926 927 /* NFS READ normally uses splice to send data in-place. However 928 * the data in cache can change after the reply's MIC is computed 929 * but before the RPC reply is sent. To prevent the client from 930 * rejecting the server-computed MIC in this somewhat rare case, 931 * do not use splice with the GSS integrity service. 932 */ 933 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags); 934 935 /* Did we already verify the signature on the original pass through? */ 936 if (rqstp->rq_deferred) 937 return 0; 938 939 if (xdr_stream_decode_u32(xdr, &len) < 0) 940 goto unwrap_failed; 941 if (len & 3) 942 goto unwrap_failed; 943 offset = xdr_stream_pos(xdr); 944 if (xdr_buf_subsegment(buf, &databody_integ, offset, len)) 945 goto unwrap_failed; 946 947 /* 948 * The xdr_stream now points to the @seq_num field. The next 949 * XDR data item is the @arg field, which contains the clear 950 * text RPC program payload. The checksum, which follows the 951 * @arg field, is located and decoded without updating the 952 * xdr_stream. 953 */ 954 955 offset += len; 956 if (xdr_decode_word(buf, offset, &checksum.len)) 957 goto unwrap_failed; 958 if (checksum.len > sizeof(gsd->gsd_scratch)) 959 goto unwrap_failed; 960 checksum.data = gsd->gsd_scratch; 961 if (read_bytes_from_xdr_buf(buf, offset + XDR_UNIT, checksum.data, 962 checksum.len)) 963 goto unwrap_failed; 964 965 maj_stat = gss_verify_mic(ctx, &databody_integ, &checksum); 966 if (maj_stat != GSS_S_COMPLETE) 967 goto bad_mic; 968 969 /* The received seqno is protected by the checksum. */ 970 if (xdr_stream_decode_u32(xdr, &seq_num) < 0) 971 goto unwrap_failed; 972 if (seq_num != seq) 973 goto bad_seqno; 974 975 xdr_truncate_decode(xdr, XDR_UNIT + checksum.len); 976 return 0; 977 978 unwrap_failed: 979 trace_rpcgss_svc_unwrap_failed(rqstp); 980 return -EINVAL; 981 bad_seqno: 982 trace_rpcgss_svc_seqno_bad(rqstp, seq, seq_num); 983 return -EINVAL; 984 bad_mic: 985 trace_rpcgss_svc_mic(rqstp, maj_stat); 986 return -EINVAL; 987 } 988 989 static inline int 990 total_buf_len(struct xdr_buf *buf) 991 { 992 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 993 } 994 995 /* 996 * RFC 2203, Section 5.3.2.3 997 * 998 * struct rpc_gss_priv_data { 999 * opaque databody_priv<> 1000 * }; 1001 * 1002 * struct rpc_gss_data_t { 1003 * unsigned int seq_num; 1004 * proc_req_arg_t arg; 1005 * }; 1006 */ 1007 static noinline_for_stack int 1008 svcauth_gss_unwrap_priv(struct svc_rqst *rqstp, u32 seq, struct gss_ctx *ctx) 1009 { 1010 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 1011 u32 len, maj_stat, seq_num, offset; 1012 struct xdr_buf *buf = xdr->buf; 1013 unsigned int saved_len; 1014 1015 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags); 1016 1017 if (xdr_stream_decode_u32(xdr, &len) < 0) 1018 goto unwrap_failed; 1019 if (rqstp->rq_deferred) { 1020 /* Already decrypted last time through! The sequence number 1021 * check at out_seq is unnecessary but harmless: */ 1022 goto out_seq; 1023 } 1024 if (len > xdr_stream_remaining(xdr)) 1025 goto unwrap_failed; 1026 offset = xdr_stream_pos(xdr); 1027 1028 saved_len = buf->len; 1029 maj_stat = gss_unwrap(ctx, offset, offset + len, buf); 1030 if (maj_stat != GSS_S_COMPLETE) 1031 goto bad_unwrap; 1032 xdr->nwords -= XDR_QUADLEN(saved_len - buf->len); 1033 1034 out_seq: 1035 /* gss_unwrap() decrypted the sequence number. */ 1036 if (xdr_stream_decode_u32(xdr, &seq_num) < 0) 1037 goto unwrap_failed; 1038 if (seq_num != seq) 1039 goto bad_seqno; 1040 return 0; 1041 1042 unwrap_failed: 1043 trace_rpcgss_svc_unwrap_failed(rqstp); 1044 return -EINVAL; 1045 bad_seqno: 1046 trace_rpcgss_svc_seqno_bad(rqstp, seq, seq_num); 1047 return -EINVAL; 1048 bad_unwrap: 1049 trace_rpcgss_svc_unwrap(rqstp, maj_stat); 1050 return -EINVAL; 1051 } 1052 1053 static int 1054 svcauth_gss_set_client(struct svc_rqst *rqstp) 1055 { 1056 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1057 struct rsc *rsci = svcdata->rsci; 1058 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 1059 int stat; 1060 1061 rqstp->rq_auth_stat = rpc_autherr_badcred; 1062 1063 /* 1064 * A gss export can be specified either by: 1065 * export *(sec=krb5,rw) 1066 * or by 1067 * export gss/krb5(rw) 1068 * The latter is deprecated; but for backwards compatibility reasons 1069 * the nfsd code will still fall back on trying it if the former 1070 * doesn't work; so we try to make both available to nfsd, below. 1071 */ 1072 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 1073 if (rqstp->rq_gssclient == NULL) 1074 return SVC_DENIED; 1075 stat = svcauth_unix_set_client(rqstp); 1076 if (stat == SVC_DROP || stat == SVC_CLOSE) 1077 return stat; 1078 1079 rqstp->rq_auth_stat = rpc_auth_ok; 1080 return SVC_OK; 1081 } 1082 1083 static inline int 1084 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, 1085 struct xdr_netobj *out_handle, int *major_status) 1086 { 1087 struct rsc *rsci; 1088 int rc; 1089 1090 if (*major_status != GSS_S_COMPLETE) 1091 return gss_write_null_verf(rqstp); 1092 rsci = gss_svc_searchbyctx(cd, out_handle); 1093 if (rsci == NULL) { 1094 *major_status = GSS_S_NO_CONTEXT; 1095 return gss_write_null_verf(rqstp); 1096 } 1097 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 1098 cache_put(&rsci->h, cd); 1099 return rc; 1100 } 1101 1102 static void gss_free_in_token_pages(struct gssp_in_token *in_token) 1103 { 1104 u32 inlen; 1105 int i; 1106 1107 i = 0; 1108 inlen = in_token->page_len; 1109 while (inlen) { 1110 if (in_token->pages[i]) 1111 put_page(in_token->pages[i]); 1112 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen; 1113 } 1114 1115 kfree(in_token->pages); 1116 in_token->pages = NULL; 1117 } 1118 1119 static int gss_read_proxy_verf(struct svc_rqst *rqstp, 1120 struct rpc_gss_wire_cred *gc, 1121 struct xdr_netobj *in_handle, 1122 struct gssp_in_token *in_token) 1123 { 1124 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 1125 unsigned int length, pgto_offs, pgfrom_offs; 1126 int pages, i, pgto, pgfrom; 1127 size_t to_offs, from_offs; 1128 u32 inlen; 1129 1130 if (dup_netobj(in_handle, &gc->gc_ctx)) 1131 return SVC_CLOSE; 1132 1133 /* 1134 * RFC 2203 Section 5.2.2 1135 * 1136 * struct rpc_gss_init_arg { 1137 * opaque gss_token<>; 1138 * }; 1139 */ 1140 if (xdr_stream_decode_u32(xdr, &inlen) < 0) 1141 goto out_denied_free; 1142 if (inlen > xdr_stream_remaining(xdr)) 1143 goto out_denied_free; 1144 1145 pages = DIV_ROUND_UP(inlen, PAGE_SIZE); 1146 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL); 1147 if (!in_token->pages) 1148 goto out_denied_free; 1149 in_token->page_base = 0; 1150 in_token->page_len = inlen; 1151 for (i = 0; i < pages; i++) { 1152 in_token->pages[i] = alloc_page(GFP_KERNEL); 1153 if (!in_token->pages[i]) { 1154 gss_free_in_token_pages(in_token); 1155 goto out_denied_free; 1156 } 1157 } 1158 1159 length = min_t(unsigned int, inlen, (char *)xdr->end - (char *)xdr->p); 1160 memcpy(page_address(in_token->pages[0]), xdr->p, length); 1161 inlen -= length; 1162 1163 to_offs = length; 1164 from_offs = rqstp->rq_arg.page_base; 1165 while (inlen) { 1166 pgto = to_offs >> PAGE_SHIFT; 1167 pgfrom = from_offs >> PAGE_SHIFT; 1168 pgto_offs = to_offs & ~PAGE_MASK; 1169 pgfrom_offs = from_offs & ~PAGE_MASK; 1170 1171 length = min_t(unsigned int, inlen, 1172 min_t(unsigned int, PAGE_SIZE - pgto_offs, 1173 PAGE_SIZE - pgfrom_offs)); 1174 memcpy(page_address(in_token->pages[pgto]) + pgto_offs, 1175 page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs, 1176 length); 1177 1178 to_offs += length; 1179 from_offs += length; 1180 inlen -= length; 1181 } 1182 return 0; 1183 1184 out_denied_free: 1185 kfree(in_handle->data); 1186 return SVC_DENIED; 1187 } 1188 1189 static inline int 1190 gss_write_resv(struct kvec *resv, size_t size_limit, 1191 struct xdr_netobj *out_handle, struct xdr_netobj *out_token, 1192 int major_status, int minor_status) 1193 { 1194 if (resv->iov_len + 4 > size_limit) 1195 return -1; 1196 svc_putnl(resv, RPC_SUCCESS); 1197 if (svc_safe_putnetobj(resv, out_handle)) 1198 return -1; 1199 if (resv->iov_len + 3 * 4 > size_limit) 1200 return -1; 1201 svc_putnl(resv, major_status); 1202 svc_putnl(resv, minor_status); 1203 svc_putnl(resv, GSS_SEQ_WIN); 1204 if (svc_safe_putnetobj(resv, out_token)) 1205 return -1; 1206 return 0; 1207 } 1208 1209 /* 1210 * Having read the cred already and found we're in the context 1211 * initiation case, read the verifier and initiate (or check the results 1212 * of) upcalls to userspace for help with context initiation. If 1213 * the upcall results are available, write the verifier and result. 1214 * Otherwise, drop the request pending an answer to the upcall. 1215 */ 1216 static int 1217 svcauth_gss_legacy_init(struct svc_rqst *rqstp, 1218 struct rpc_gss_wire_cred *gc) 1219 { 1220 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 1221 struct kvec *resv = &rqstp->rq_res.head[0]; 1222 struct rsi *rsip, rsikey; 1223 __be32 *p; 1224 u32 len; 1225 int ret; 1226 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1227 1228 memset(&rsikey, 0, sizeof(rsikey)); 1229 if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) 1230 return SVC_CLOSE; 1231 1232 /* 1233 * RFC 2203 Section 5.2.2 1234 * 1235 * struct rpc_gss_init_arg { 1236 * opaque gss_token<>; 1237 * }; 1238 */ 1239 if (xdr_stream_decode_u32(xdr, &len) < 0) { 1240 kfree(rsikey.in_handle.data); 1241 return SVC_DENIED; 1242 } 1243 p = xdr_inline_decode(xdr, len); 1244 if (!p) { 1245 kfree(rsikey.in_handle.data); 1246 return SVC_DENIED; 1247 } 1248 rsikey.in_token.data = kmalloc(len, GFP_KERNEL); 1249 if (ZERO_OR_NULL_PTR(rsikey.in_token.data)) { 1250 kfree(rsikey.in_handle.data); 1251 return SVC_CLOSE; 1252 } 1253 memcpy(rsikey.in_token.data, p, len); 1254 rsikey.in_token.len = len; 1255 1256 /* Perform upcall, or find upcall result: */ 1257 rsip = rsi_lookup(sn->rsi_cache, &rsikey); 1258 rsi_free(&rsikey); 1259 if (!rsip) 1260 return SVC_CLOSE; 1261 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 1262 /* No upcall result: */ 1263 return SVC_CLOSE; 1264 1265 ret = SVC_CLOSE; 1266 /* Got an answer to the upcall; use it: */ 1267 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1268 &rsip->out_handle, &rsip->major_status)) 1269 goto out; 1270 if (gss_write_resv(resv, PAGE_SIZE, 1271 &rsip->out_handle, &rsip->out_token, 1272 rsip->major_status, rsip->minor_status)) 1273 goto out; 1274 1275 ret = SVC_COMPLETE; 1276 out: 1277 cache_put(&rsip->h, sn->rsi_cache); 1278 return ret; 1279 } 1280 1281 static int gss_proxy_save_rsc(struct cache_detail *cd, 1282 struct gssp_upcall_data *ud, 1283 uint64_t *handle) 1284 { 1285 struct rsc rsci, *rscp = NULL; 1286 static atomic64_t ctxhctr; 1287 long long ctxh; 1288 struct gss_api_mech *gm = NULL; 1289 time64_t expiry; 1290 int status; 1291 1292 memset(&rsci, 0, sizeof(rsci)); 1293 /* context handle */ 1294 status = -ENOMEM; 1295 /* the handle needs to be just a unique id, 1296 * use a static counter */ 1297 ctxh = atomic64_inc_return(&ctxhctr); 1298 1299 /* make a copy for the caller */ 1300 *handle = ctxh; 1301 1302 /* make a copy for the rsc cache */ 1303 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t))) 1304 goto out; 1305 rscp = rsc_lookup(cd, &rsci); 1306 if (!rscp) 1307 goto out; 1308 1309 /* creds */ 1310 if (!ud->found_creds) { 1311 /* userspace seem buggy, we should always get at least a 1312 * mapping to nobody */ 1313 goto out; 1314 } else { 1315 struct timespec64 boot; 1316 1317 /* steal creds */ 1318 rsci.cred = ud->creds; 1319 memset(&ud->creds, 0, sizeof(struct svc_cred)); 1320 1321 status = -EOPNOTSUPP; 1322 /* get mech handle from OID */ 1323 gm = gss_mech_get_by_OID(&ud->mech_oid); 1324 if (!gm) 1325 goto out; 1326 rsci.cred.cr_gss_mech = gm; 1327 1328 status = -EINVAL; 1329 /* mech-specific data: */ 1330 status = gss_import_sec_context(ud->out_handle.data, 1331 ud->out_handle.len, 1332 gm, &rsci.mechctx, 1333 &expiry, GFP_KERNEL); 1334 if (status) 1335 goto out; 1336 1337 getboottime64(&boot); 1338 expiry -= boot.tv_sec; 1339 } 1340 1341 rsci.h.expiry_time = expiry; 1342 rscp = rsc_update(cd, &rsci, rscp); 1343 status = 0; 1344 out: 1345 rsc_free(&rsci); 1346 if (rscp) 1347 cache_put(&rscp->h, cd); 1348 else 1349 status = -ENOMEM; 1350 return status; 1351 } 1352 1353 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp, 1354 struct rpc_gss_wire_cred *gc) 1355 { 1356 struct kvec *resv = &rqstp->rq_res.head[0]; 1357 struct xdr_netobj cli_handle; 1358 struct gssp_upcall_data ud; 1359 uint64_t handle; 1360 int status; 1361 int ret; 1362 struct net *net = SVC_NET(rqstp); 1363 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1364 1365 memset(&ud, 0, sizeof(ud)); 1366 ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token); 1367 if (ret) 1368 return ret; 1369 1370 ret = SVC_CLOSE; 1371 1372 /* Perform synchronous upcall to gss-proxy */ 1373 status = gssp_accept_sec_context_upcall(net, &ud); 1374 if (status) 1375 goto out; 1376 1377 trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status); 1378 1379 switch (ud.major_status) { 1380 case GSS_S_CONTINUE_NEEDED: 1381 cli_handle = ud.out_handle; 1382 break; 1383 case GSS_S_COMPLETE: 1384 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle); 1385 if (status) 1386 goto out; 1387 cli_handle.data = (u8 *)&handle; 1388 cli_handle.len = sizeof(handle); 1389 break; 1390 default: 1391 goto out; 1392 } 1393 1394 /* Got an answer to the upcall; use it: */ 1395 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1396 &cli_handle, &ud.major_status)) 1397 goto out; 1398 if (gss_write_resv(resv, PAGE_SIZE, 1399 &cli_handle, &ud.out_token, 1400 ud.major_status, ud.minor_status)) 1401 goto out; 1402 1403 ret = SVC_COMPLETE; 1404 out: 1405 gss_free_in_token_pages(&ud.in_token); 1406 gssp_free_upcall_data(&ud); 1407 return ret; 1408 } 1409 1410 /* 1411 * Try to set the sn->use_gss_proxy variable to a new value. We only allow 1412 * it to be changed if it's currently undefined (-1). If it's any other value 1413 * then return -EBUSY unless the type wouldn't have changed anyway. 1414 */ 1415 static int set_gss_proxy(struct net *net, int type) 1416 { 1417 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1418 int ret; 1419 1420 WARN_ON_ONCE(type != 0 && type != 1); 1421 ret = cmpxchg(&sn->use_gss_proxy, -1, type); 1422 if (ret != -1 && ret != type) 1423 return -EBUSY; 1424 return 0; 1425 } 1426 1427 static bool use_gss_proxy(struct net *net) 1428 { 1429 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1430 1431 /* If use_gss_proxy is still undefined, then try to disable it */ 1432 if (sn->use_gss_proxy == -1) 1433 set_gss_proxy(net, 0); 1434 return sn->use_gss_proxy; 1435 } 1436 1437 static noinline_for_stack int 1438 svcauth_gss_proc_init(struct svc_rqst *rqstp, struct rpc_gss_wire_cred *gc) 1439 { 1440 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 1441 u32 flavor, len; 1442 void *body; 1443 1444 /* Call's verf field: */ 1445 if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0) 1446 return SVC_GARBAGE; 1447 if (flavor != RPC_AUTH_NULL || len != 0) { 1448 rqstp->rq_auth_stat = rpc_autherr_badverf; 1449 return SVC_DENIED; 1450 } 1451 1452 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) { 1453 rqstp->rq_auth_stat = rpc_autherr_badcred; 1454 return SVC_DENIED; 1455 } 1456 1457 if (!use_gss_proxy(SVC_NET(rqstp))) 1458 return svcauth_gss_legacy_init(rqstp, gc); 1459 return svcauth_gss_proxy_init(rqstp, gc); 1460 } 1461 1462 #ifdef CONFIG_PROC_FS 1463 1464 static ssize_t write_gssp(struct file *file, const char __user *buf, 1465 size_t count, loff_t *ppos) 1466 { 1467 struct net *net = pde_data(file_inode(file)); 1468 char tbuf[20]; 1469 unsigned long i; 1470 int res; 1471 1472 if (*ppos || count > sizeof(tbuf)-1) 1473 return -EINVAL; 1474 if (copy_from_user(tbuf, buf, count)) 1475 return -EFAULT; 1476 1477 tbuf[count] = 0; 1478 res = kstrtoul(tbuf, 0, &i); 1479 if (res) 1480 return res; 1481 if (i != 1) 1482 return -EINVAL; 1483 res = set_gssp_clnt(net); 1484 if (res) 1485 return res; 1486 res = set_gss_proxy(net, 1); 1487 if (res) 1488 return res; 1489 return count; 1490 } 1491 1492 static ssize_t read_gssp(struct file *file, char __user *buf, 1493 size_t count, loff_t *ppos) 1494 { 1495 struct net *net = pde_data(file_inode(file)); 1496 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1497 unsigned long p = *ppos; 1498 char tbuf[10]; 1499 size_t len; 1500 1501 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy); 1502 len = strlen(tbuf); 1503 if (p >= len) 1504 return 0; 1505 len -= p; 1506 if (len > count) 1507 len = count; 1508 if (copy_to_user(buf, (void *)(tbuf+p), len)) 1509 return -EFAULT; 1510 *ppos += len; 1511 return len; 1512 } 1513 1514 static const struct proc_ops use_gss_proxy_proc_ops = { 1515 .proc_open = nonseekable_open, 1516 .proc_write = write_gssp, 1517 .proc_read = read_gssp, 1518 }; 1519 1520 static int create_use_gss_proxy_proc_entry(struct net *net) 1521 { 1522 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1523 struct proc_dir_entry **p = &sn->use_gssp_proc; 1524 1525 sn->use_gss_proxy = -1; 1526 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600, 1527 sn->proc_net_rpc, 1528 &use_gss_proxy_proc_ops, net); 1529 if (!*p) 1530 return -ENOMEM; 1531 init_gssp_clnt(sn); 1532 return 0; 1533 } 1534 1535 static void destroy_use_gss_proxy_proc_entry(struct net *net) 1536 { 1537 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1538 1539 if (sn->use_gssp_proc) { 1540 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc); 1541 clear_gssp_clnt(sn); 1542 } 1543 } 1544 #else /* CONFIG_PROC_FS */ 1545 1546 static int create_use_gss_proxy_proc_entry(struct net *net) 1547 { 1548 return 0; 1549 } 1550 1551 static void destroy_use_gss_proxy_proc_entry(struct net *net) {} 1552 1553 #endif /* CONFIG_PROC_FS */ 1554 1555 /* 1556 * Accept an rpcsec packet. 1557 * If context establishment, punt to user space 1558 * If data exchange, verify/decrypt 1559 * If context destruction, handle here 1560 * In the context establishment and destruction case we encode 1561 * response here and return SVC_COMPLETE. 1562 */ 1563 static int 1564 svcauth_gss_accept(struct svc_rqst *rqstp) 1565 { 1566 struct kvec *argv = &rqstp->rq_arg.head[0]; 1567 struct kvec *resv = &rqstp->rq_res.head[0]; 1568 u32 crlen; 1569 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1570 struct rpc_gss_wire_cred *gc; 1571 struct rsc *rsci = NULL; 1572 __be32 *rpcstart; 1573 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1574 int ret; 1575 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1576 1577 rqstp->rq_auth_stat = rpc_autherr_badcred; 1578 if (!svcdata) 1579 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1580 if (!svcdata) 1581 goto auth_err; 1582 rqstp->rq_auth_data = svcdata; 1583 svcdata->verf_start = NULL; 1584 svcdata->rsci = NULL; 1585 gc = &svcdata->clcred; 1586 1587 /* start of rpc packet is 7 u32's back from here: 1588 * xid direction rpcversion prog vers proc flavour 1589 */ 1590 rpcstart = argv->iov_base; 1591 rpcstart -= 7; 1592 1593 /* credential is: 1594 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1595 * at least 5 u32s, and is preceded by length, so that makes 6. 1596 */ 1597 1598 if (argv->iov_len < 5 * 4) 1599 goto auth_err; 1600 crlen = svc_getnl(argv); 1601 if (svc_getnl(argv) != RPC_GSS_VERSION) 1602 goto auth_err; 1603 gc->gc_proc = svc_getnl(argv); 1604 gc->gc_seq = svc_getnl(argv); 1605 gc->gc_svc = svc_getnl(argv); 1606 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1607 goto auth_err; 1608 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1609 goto auth_err; 1610 1611 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1612 goto auth_err; 1613 1614 svcxdr_init_decode(rqstp); 1615 rqstp->rq_auth_stat = rpc_autherr_badverf; 1616 switch (gc->gc_proc) { 1617 case RPC_GSS_PROC_INIT: 1618 case RPC_GSS_PROC_CONTINUE_INIT: 1619 return svcauth_gss_proc_init(rqstp, gc); 1620 case RPC_GSS_PROC_DATA: 1621 case RPC_GSS_PROC_DESTROY: 1622 /* Look up the context, and check the verifier: */ 1623 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem; 1624 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 1625 if (!rsci) 1626 goto auth_err; 1627 switch (svcauth_gss_verify_header(rqstp, rsci, rpcstart, gc)) { 1628 case SVC_OK: 1629 break; 1630 case SVC_DENIED: 1631 goto auth_err; 1632 case SVC_DROP: 1633 goto drop; 1634 } 1635 break; 1636 default: 1637 rqstp->rq_auth_stat = rpc_autherr_rejectedcred; 1638 goto auth_err; 1639 } 1640 1641 /* now act upon the command: */ 1642 switch (gc->gc_proc) { 1643 case RPC_GSS_PROC_DESTROY: 1644 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1645 goto auth_err; 1646 /* Delete the entry from the cache_list and call cache_put */ 1647 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h); 1648 if (resv->iov_len + 4 > PAGE_SIZE) 1649 goto drop; 1650 svc_putnl(resv, RPC_SUCCESS); 1651 goto complete; 1652 case RPC_GSS_PROC_DATA: 1653 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem; 1654 svcdata->verf_start = resv->iov_base + resv->iov_len; 1655 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1656 goto auth_err; 1657 rqstp->rq_cred = rsci->cred; 1658 get_group_info(rsci->cred.cr_group_info); 1659 rqstp->rq_auth_stat = rpc_autherr_badcred; 1660 switch (gc->gc_svc) { 1661 case RPC_GSS_SVC_NONE: 1662 break; 1663 case RPC_GSS_SVC_INTEGRITY: 1664 /* placeholders for length and seq. number: */ 1665 svc_putnl(resv, 0); 1666 svc_putnl(resv, 0); 1667 if (svcauth_gss_unwrap_integ(rqstp, gc->gc_seq, 1668 rsci->mechctx)) 1669 goto garbage_args; 1670 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE; 1671 break; 1672 case RPC_GSS_SVC_PRIVACY: 1673 /* placeholders for length and seq. number: */ 1674 svc_putnl(resv, 0); 1675 svc_putnl(resv, 0); 1676 if (svcauth_gss_unwrap_priv(rqstp, gc->gc_seq, 1677 rsci->mechctx)) 1678 goto garbage_args; 1679 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2; 1680 break; 1681 default: 1682 goto auth_err; 1683 } 1684 svcdata->rsci = rsci; 1685 cache_get(&rsci->h); 1686 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( 1687 rsci->mechctx->mech_type, 1688 GSS_C_QOP_DEFAULT, 1689 gc->gc_svc); 1690 ret = SVC_OK; 1691 trace_rpcgss_svc_authenticate(rqstp, gc); 1692 goto out; 1693 } 1694 garbage_args: 1695 ret = SVC_GARBAGE; 1696 goto out; 1697 auth_err: 1698 /* Restore write pointer to its original value: */ 1699 xdr_ressize_check(rqstp, reject_stat); 1700 ret = SVC_DENIED; 1701 goto out; 1702 complete: 1703 ret = SVC_COMPLETE; 1704 goto out; 1705 drop: 1706 ret = SVC_CLOSE; 1707 out: 1708 if (rsci) 1709 cache_put(&rsci->h, sn->rsc_cache); 1710 return ret; 1711 } 1712 1713 static __be32 * 1714 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1715 { 1716 __be32 *p; 1717 u32 verf_len; 1718 1719 p = gsd->verf_start; 1720 gsd->verf_start = NULL; 1721 1722 /* If the reply stat is nonzero, don't wrap: */ 1723 if (*(p-1) != rpc_success) 1724 return NULL; 1725 /* Skip the verifier: */ 1726 p += 1; 1727 verf_len = ntohl(*p++); 1728 p += XDR_QUADLEN(verf_len); 1729 /* move accept_stat to right place: */ 1730 memcpy(p, p + 2, 4); 1731 /* Also don't wrap if the accept stat is nonzero: */ 1732 if (*p != rpc_success) { 1733 resbuf->head[0].iov_len -= 2 * 4; 1734 return NULL; 1735 } 1736 p++; 1737 return p; 1738 } 1739 1740 static inline int 1741 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1742 { 1743 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1744 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1745 struct xdr_buf *resbuf = &rqstp->rq_res; 1746 struct xdr_buf integ_buf; 1747 struct xdr_netobj mic; 1748 struct kvec *resv; 1749 __be32 *p; 1750 int integ_offset, integ_len; 1751 int stat = -EINVAL; 1752 1753 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1754 if (p == NULL) 1755 goto out; 1756 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1757 integ_len = resbuf->len - integ_offset; 1758 if (integ_len & 3) 1759 goto out; 1760 *p++ = htonl(integ_len); 1761 *p++ = htonl(gc->gc_seq); 1762 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) { 1763 WARN_ON_ONCE(1); 1764 goto out_err; 1765 } 1766 if (resbuf->tail[0].iov_base == NULL) { 1767 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1768 goto out_err; 1769 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1770 + resbuf->head[0].iov_len; 1771 resbuf->tail[0].iov_len = 0; 1772 } 1773 resv = &resbuf->tail[0]; 1774 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1775 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1776 goto out_err; 1777 svc_putnl(resv, mic.len); 1778 memset(mic.data + mic.len, 0, 1779 round_up_to_quad(mic.len) - mic.len); 1780 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1781 /* not strictly required: */ 1782 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1783 if (resv->iov_len > PAGE_SIZE) 1784 goto out_err; 1785 out: 1786 stat = 0; 1787 out_err: 1788 return stat; 1789 } 1790 1791 static inline int 1792 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1793 { 1794 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1795 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1796 struct xdr_buf *resbuf = &rqstp->rq_res; 1797 struct page **inpages = NULL; 1798 __be32 *p, *len; 1799 int offset; 1800 int pad; 1801 1802 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1803 if (p == NULL) 1804 return 0; 1805 len = p++; 1806 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1807 *p++ = htonl(gc->gc_seq); 1808 inpages = resbuf->pages; 1809 /* XXX: Would be better to write some xdr helper functions for 1810 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1811 1812 /* 1813 * If there is currently tail data, make sure there is 1814 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1815 * the page, and move the current tail data such that 1816 * there is RPC_MAX_AUTH_SIZE slack space available in 1817 * both the head and tail. 1818 */ 1819 if (resbuf->tail[0].iov_base) { 1820 if (resbuf->tail[0].iov_base >= 1821 resbuf->head[0].iov_base + PAGE_SIZE) 1822 return -EINVAL; 1823 if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base) 1824 return -EINVAL; 1825 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1826 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1827 return -ENOMEM; 1828 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1829 resbuf->tail[0].iov_base, 1830 resbuf->tail[0].iov_len); 1831 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1832 } 1833 /* 1834 * If there is no current tail data, make sure there is 1835 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1836 * allotted page, and set up tail information such that there 1837 * is RPC_MAX_AUTH_SIZE slack space available in both the 1838 * head and tail. 1839 */ 1840 if (resbuf->tail[0].iov_base == NULL) { 1841 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1842 return -ENOMEM; 1843 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1844 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1845 resbuf->tail[0].iov_len = 0; 1846 } 1847 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1848 return -ENOMEM; 1849 *len = htonl(resbuf->len - offset); 1850 pad = 3 - ((resbuf->len - offset - 1)&3); 1851 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1852 memset(p, 0, pad); 1853 resbuf->tail[0].iov_len += pad; 1854 resbuf->len += pad; 1855 return 0; 1856 } 1857 1858 static int 1859 svcauth_gss_release(struct svc_rqst *rqstp) 1860 { 1861 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1862 struct rpc_gss_wire_cred *gc; 1863 struct xdr_buf *resbuf = &rqstp->rq_res; 1864 int stat = -EINVAL; 1865 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1866 1867 if (!gsd) 1868 goto out; 1869 gc = &gsd->clcred; 1870 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1871 goto out; 1872 /* Release can be called twice, but we only wrap once. */ 1873 if (gsd->verf_start == NULL) 1874 goto out; 1875 /* normally not set till svc_send, but we need it here: */ 1876 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1877 * or whatever? */ 1878 resbuf->len = total_buf_len(resbuf); 1879 switch (gc->gc_svc) { 1880 case RPC_GSS_SVC_NONE: 1881 break; 1882 case RPC_GSS_SVC_INTEGRITY: 1883 stat = svcauth_gss_wrap_resp_integ(rqstp); 1884 if (stat) 1885 goto out_err; 1886 break; 1887 case RPC_GSS_SVC_PRIVACY: 1888 stat = svcauth_gss_wrap_resp_priv(rqstp); 1889 if (stat) 1890 goto out_err; 1891 break; 1892 /* 1893 * For any other gc_svc value, svcauth_gss_accept() already set 1894 * the auth_error appropriately; just fall through: 1895 */ 1896 } 1897 1898 out: 1899 stat = 0; 1900 out_err: 1901 if (rqstp->rq_client) 1902 auth_domain_put(rqstp->rq_client); 1903 rqstp->rq_client = NULL; 1904 if (rqstp->rq_gssclient) 1905 auth_domain_put(rqstp->rq_gssclient); 1906 rqstp->rq_gssclient = NULL; 1907 if (rqstp->rq_cred.cr_group_info) 1908 put_group_info(rqstp->rq_cred.cr_group_info); 1909 rqstp->rq_cred.cr_group_info = NULL; 1910 if (gsd && gsd->rsci) { 1911 cache_put(&gsd->rsci->h, sn->rsc_cache); 1912 gsd->rsci = NULL; 1913 } 1914 return stat; 1915 } 1916 1917 static void 1918 svcauth_gss_domain_release_rcu(struct rcu_head *head) 1919 { 1920 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head); 1921 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1922 1923 kfree(dom->name); 1924 kfree(gd); 1925 } 1926 1927 static void 1928 svcauth_gss_domain_release(struct auth_domain *dom) 1929 { 1930 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu); 1931 } 1932 1933 static struct auth_ops svcauthops_gss = { 1934 .name = "rpcsec_gss", 1935 .owner = THIS_MODULE, 1936 .flavour = RPC_AUTH_GSS, 1937 .accept = svcauth_gss_accept, 1938 .release = svcauth_gss_release, 1939 .domain_release = svcauth_gss_domain_release, 1940 .set_client = svcauth_gss_set_client, 1941 }; 1942 1943 static int rsi_cache_create_net(struct net *net) 1944 { 1945 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1946 struct cache_detail *cd; 1947 int err; 1948 1949 cd = cache_create_net(&rsi_cache_template, net); 1950 if (IS_ERR(cd)) 1951 return PTR_ERR(cd); 1952 err = cache_register_net(cd, net); 1953 if (err) { 1954 cache_destroy_net(cd, net); 1955 return err; 1956 } 1957 sn->rsi_cache = cd; 1958 return 0; 1959 } 1960 1961 static void rsi_cache_destroy_net(struct net *net) 1962 { 1963 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1964 struct cache_detail *cd = sn->rsi_cache; 1965 1966 sn->rsi_cache = NULL; 1967 cache_purge(cd); 1968 cache_unregister_net(cd, net); 1969 cache_destroy_net(cd, net); 1970 } 1971 1972 static int rsc_cache_create_net(struct net *net) 1973 { 1974 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1975 struct cache_detail *cd; 1976 int err; 1977 1978 cd = cache_create_net(&rsc_cache_template, net); 1979 if (IS_ERR(cd)) 1980 return PTR_ERR(cd); 1981 err = cache_register_net(cd, net); 1982 if (err) { 1983 cache_destroy_net(cd, net); 1984 return err; 1985 } 1986 sn->rsc_cache = cd; 1987 return 0; 1988 } 1989 1990 static void rsc_cache_destroy_net(struct net *net) 1991 { 1992 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1993 struct cache_detail *cd = sn->rsc_cache; 1994 1995 sn->rsc_cache = NULL; 1996 cache_purge(cd); 1997 cache_unregister_net(cd, net); 1998 cache_destroy_net(cd, net); 1999 } 2000 2001 int 2002 gss_svc_init_net(struct net *net) 2003 { 2004 int rv; 2005 2006 rv = rsc_cache_create_net(net); 2007 if (rv) 2008 return rv; 2009 rv = rsi_cache_create_net(net); 2010 if (rv) 2011 goto out1; 2012 rv = create_use_gss_proxy_proc_entry(net); 2013 if (rv) 2014 goto out2; 2015 return 0; 2016 out2: 2017 rsi_cache_destroy_net(net); 2018 out1: 2019 rsc_cache_destroy_net(net); 2020 return rv; 2021 } 2022 2023 void 2024 gss_svc_shutdown_net(struct net *net) 2025 { 2026 destroy_use_gss_proxy_proc_entry(net); 2027 rsi_cache_destroy_net(net); 2028 rsc_cache_destroy_net(net); 2029 } 2030 2031 int 2032 gss_svc_init(void) 2033 { 2034 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 2035 } 2036 2037 void 2038 gss_svc_shutdown(void) 2039 { 2040 svc_auth_unregister(RPC_AUTH_GSS); 2041 } 2042