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 * Verify the checksum on the header and return SVC_OK on success. 736 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 737 * or return SVC_DENIED and indicate error in rqstp->rq_auth_stat. 738 */ 739 static int 740 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 741 __be32 *rpcstart, struct rpc_gss_wire_cred *gc) 742 { 743 struct gss_ctx *ctx_id = rsci->mechctx; 744 struct xdr_buf rpchdr; 745 struct xdr_netobj checksum; 746 u32 flavor = 0; 747 struct kvec *argv = &rqstp->rq_arg.head[0]; 748 struct kvec iov; 749 750 /* data to compute the checksum over: */ 751 iov.iov_base = rpcstart; 752 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 753 xdr_buf_from_iov(&iov, &rpchdr); 754 755 rqstp->rq_auth_stat = rpc_autherr_badverf; 756 if (argv->iov_len < 4) 757 return SVC_DENIED; 758 flavor = svc_getnl(argv); 759 if (flavor != RPC_AUTH_GSS) 760 return SVC_DENIED; 761 if (svc_safe_getnetobj(argv, &checksum)) 762 return SVC_DENIED; 763 764 if (rqstp->rq_deferred) /* skip verification of revisited request */ 765 return SVC_OK; 766 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 767 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem; 768 return SVC_DENIED; 769 } 770 771 if (gc->gc_seq > MAXSEQ) { 772 trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq); 773 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem; 774 return SVC_DENIED; 775 } 776 if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq)) 777 return SVC_DROP; 778 return SVC_OK; 779 } 780 781 static int 782 gss_write_null_verf(struct svc_rqst *rqstp) 783 { 784 __be32 *p; 785 786 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 787 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 788 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 789 *p++ = 0; 790 if (!xdr_ressize_check(rqstp, p)) 791 return -1; 792 return 0; 793 } 794 795 static int 796 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 797 { 798 __be32 *xdr_seq; 799 u32 maj_stat; 800 struct xdr_buf verf_data; 801 struct xdr_netobj mic; 802 __be32 *p; 803 struct kvec iov; 804 int err = -1; 805 806 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 807 xdr_seq = kmalloc(4, GFP_KERNEL); 808 if (!xdr_seq) 809 return -ENOMEM; 810 *xdr_seq = htonl(seq); 811 812 iov.iov_base = xdr_seq; 813 iov.iov_len = 4; 814 xdr_buf_from_iov(&iov, &verf_data); 815 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 816 mic.data = (u8 *)(p + 1); 817 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 818 if (maj_stat != GSS_S_COMPLETE) 819 goto out; 820 *p++ = htonl(mic.len); 821 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 822 p += XDR_QUADLEN(mic.len); 823 if (!xdr_ressize_check(rqstp, p)) 824 goto out; 825 err = 0; 826 out: 827 kfree(xdr_seq); 828 return err; 829 } 830 831 struct gss_domain { 832 struct auth_domain h; 833 u32 pseudoflavor; 834 }; 835 836 static struct auth_domain * 837 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 838 { 839 char *name; 840 841 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 842 if (!name) 843 return NULL; 844 return auth_domain_find(name); 845 } 846 847 static struct auth_ops svcauthops_gss; 848 849 u32 svcauth_gss_flavor(struct auth_domain *dom) 850 { 851 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 852 853 return gd->pseudoflavor; 854 } 855 856 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 857 858 struct auth_domain * 859 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 860 { 861 struct gss_domain *new; 862 struct auth_domain *test; 863 int stat = -ENOMEM; 864 865 new = kmalloc(sizeof(*new), GFP_KERNEL); 866 if (!new) 867 goto out; 868 kref_init(&new->h.ref); 869 new->h.name = kstrdup(name, GFP_KERNEL); 870 if (!new->h.name) 871 goto out_free_dom; 872 new->h.flavour = &svcauthops_gss; 873 new->pseudoflavor = pseudoflavor; 874 875 test = auth_domain_lookup(name, &new->h); 876 if (test != &new->h) { 877 pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n", 878 name); 879 stat = -EADDRINUSE; 880 auth_domain_put(test); 881 goto out_free_name; 882 } 883 return test; 884 885 out_free_name: 886 kfree(new->h.name); 887 out_free_dom: 888 kfree(new); 889 out: 890 return ERR_PTR(stat); 891 } 892 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 893 894 static inline int 895 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 896 { 897 __be32 raw; 898 int status; 899 900 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 901 if (status) 902 return status; 903 *obj = ntohl(raw); 904 return 0; 905 } 906 907 /* It would be nice if this bit of code could be shared with the client. 908 * Obstacles: 909 * The client shouldn't malloc(), would have to pass in own memory. 910 * The server uses base of head iovec as read pointer, while the 911 * client uses separate pointer. */ 912 static int 913 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 914 { 915 struct gss_svc_data *gsd = rqstp->rq_auth_data; 916 u32 integ_len, rseqno, maj_stat; 917 struct xdr_netobj mic; 918 struct xdr_buf integ_buf; 919 920 /* NFS READ normally uses splice to send data in-place. However 921 * the data in cache can change after the reply's MIC is computed 922 * but before the RPC reply is sent. To prevent the client from 923 * rejecting the server-computed MIC in this somewhat rare case, 924 * do not use splice with the GSS integrity service. 925 */ 926 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags); 927 928 /* Did we already verify the signature on the original pass through? */ 929 if (rqstp->rq_deferred) 930 return 0; 931 932 integ_len = svc_getnl(&buf->head[0]); 933 if (integ_len & 3) 934 goto unwrap_failed; 935 if (integ_len > buf->len) 936 goto unwrap_failed; 937 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 938 goto unwrap_failed; 939 940 /* copy out mic... */ 941 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 942 goto unwrap_failed; 943 if (mic.len > sizeof(gsd->gsd_scratch)) 944 goto unwrap_failed; 945 mic.data = gsd->gsd_scratch; 946 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 947 goto unwrap_failed; 948 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 949 if (maj_stat != GSS_S_COMPLETE) 950 goto bad_mic; 951 rseqno = svc_getnl(&buf->head[0]); 952 if (rseqno != seq) 953 goto bad_seqno; 954 /* trim off the mic and padding at the end before returning */ 955 xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4); 956 return 0; 957 958 unwrap_failed: 959 trace_rpcgss_svc_unwrap_failed(rqstp); 960 return -EINVAL; 961 bad_seqno: 962 trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno); 963 return -EINVAL; 964 bad_mic: 965 trace_rpcgss_svc_mic(rqstp, maj_stat); 966 return -EINVAL; 967 } 968 969 static inline int 970 total_buf_len(struct xdr_buf *buf) 971 { 972 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 973 } 974 975 static void 976 fix_priv_head(struct xdr_buf *buf, int pad) 977 { 978 if (buf->page_len == 0) { 979 /* We need to adjust head and buf->len in tandem in this 980 * case to make svc_defer() work--it finds the original 981 * buffer start using buf->len - buf->head[0].iov_len. */ 982 buf->head[0].iov_len -= pad; 983 } 984 } 985 986 static int 987 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 988 { 989 u32 priv_len, maj_stat; 990 int pad, remaining_len, offset; 991 u32 rseqno; 992 993 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags); 994 995 priv_len = svc_getnl(&buf->head[0]); 996 if (rqstp->rq_deferred) { 997 /* Already decrypted last time through! The sequence number 998 * check at out_seq is unnecessary but harmless: */ 999 goto out_seq; 1000 } 1001 /* buf->len is the number of bytes from the original start of the 1002 * request to the end, where head[0].iov_len is just the bytes 1003 * not yet read from the head, so these two values are different: */ 1004 remaining_len = total_buf_len(buf); 1005 if (priv_len > remaining_len) 1006 goto unwrap_failed; 1007 pad = remaining_len - priv_len; 1008 buf->len -= pad; 1009 fix_priv_head(buf, pad); 1010 1011 maj_stat = gss_unwrap(ctx, 0, priv_len, buf); 1012 pad = priv_len - buf->len; 1013 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 1014 * In the krb5p case, at least, the data ends up offset, so we need to 1015 * move it around. */ 1016 /* XXX: This is very inefficient. It would be better to either do 1017 * this while we encrypt, or maybe in the receive code, if we can peak 1018 * ahead and work out the service and mechanism there. */ 1019 offset = xdr_pad_size(buf->head[0].iov_len); 1020 if (offset) { 1021 buf->buflen = RPCSVC_MAXPAYLOAD; 1022 xdr_shift_buf(buf, offset); 1023 fix_priv_head(buf, pad); 1024 } 1025 if (maj_stat != GSS_S_COMPLETE) 1026 goto bad_unwrap; 1027 out_seq: 1028 rseqno = svc_getnl(&buf->head[0]); 1029 if (rseqno != seq) 1030 goto bad_seqno; 1031 return 0; 1032 1033 unwrap_failed: 1034 trace_rpcgss_svc_unwrap_failed(rqstp); 1035 return -EINVAL; 1036 bad_seqno: 1037 trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno); 1038 return -EINVAL; 1039 bad_unwrap: 1040 trace_rpcgss_svc_unwrap(rqstp, maj_stat); 1041 return -EINVAL; 1042 } 1043 1044 static int 1045 svcauth_gss_set_client(struct svc_rqst *rqstp) 1046 { 1047 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1048 struct rsc *rsci = svcdata->rsci; 1049 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 1050 int stat; 1051 1052 rqstp->rq_auth_stat = rpc_autherr_badcred; 1053 1054 /* 1055 * A gss export can be specified either by: 1056 * export *(sec=krb5,rw) 1057 * or by 1058 * export gss/krb5(rw) 1059 * The latter is deprecated; but for backwards compatibility reasons 1060 * the nfsd code will still fall back on trying it if the former 1061 * doesn't work; so we try to make both available to nfsd, below. 1062 */ 1063 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 1064 if (rqstp->rq_gssclient == NULL) 1065 return SVC_DENIED; 1066 stat = svcauth_unix_set_client(rqstp); 1067 if (stat == SVC_DROP || stat == SVC_CLOSE) 1068 return stat; 1069 1070 rqstp->rq_auth_stat = rpc_auth_ok; 1071 return SVC_OK; 1072 } 1073 1074 static inline int 1075 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, 1076 struct xdr_netobj *out_handle, int *major_status) 1077 { 1078 struct rsc *rsci; 1079 int rc; 1080 1081 if (*major_status != GSS_S_COMPLETE) 1082 return gss_write_null_verf(rqstp); 1083 rsci = gss_svc_searchbyctx(cd, out_handle); 1084 if (rsci == NULL) { 1085 *major_status = GSS_S_NO_CONTEXT; 1086 return gss_write_null_verf(rqstp); 1087 } 1088 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 1089 cache_put(&rsci->h, cd); 1090 return rc; 1091 } 1092 1093 static void gss_free_in_token_pages(struct gssp_in_token *in_token) 1094 { 1095 u32 inlen; 1096 int i; 1097 1098 i = 0; 1099 inlen = in_token->page_len; 1100 while (inlen) { 1101 if (in_token->pages[i]) 1102 put_page(in_token->pages[i]); 1103 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen; 1104 } 1105 1106 kfree(in_token->pages); 1107 in_token->pages = NULL; 1108 } 1109 1110 static int gss_read_proxy_verf(struct svc_rqst *rqstp, 1111 struct rpc_gss_wire_cred *gc, 1112 struct xdr_netobj *in_handle, 1113 struct gssp_in_token *in_token) 1114 { 1115 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 1116 unsigned int length, pgto_offs, pgfrom_offs; 1117 int pages, i, pgto, pgfrom; 1118 size_t to_offs, from_offs; 1119 u32 inlen; 1120 1121 if (dup_netobj(in_handle, &gc->gc_ctx)) 1122 return SVC_CLOSE; 1123 1124 /* 1125 * RFC 2203 Section 5.2.2 1126 * 1127 * struct rpc_gss_init_arg { 1128 * opaque gss_token<>; 1129 * }; 1130 */ 1131 if (xdr_stream_decode_u32(xdr, &inlen) < 0) 1132 goto out_denied_free; 1133 if (inlen > xdr_stream_remaining(xdr)) 1134 goto out_denied_free; 1135 1136 pages = DIV_ROUND_UP(inlen, PAGE_SIZE); 1137 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL); 1138 if (!in_token->pages) 1139 goto out_denied_free; 1140 in_token->page_base = 0; 1141 in_token->page_len = inlen; 1142 for (i = 0; i < pages; i++) { 1143 in_token->pages[i] = alloc_page(GFP_KERNEL); 1144 if (!in_token->pages[i]) { 1145 gss_free_in_token_pages(in_token); 1146 goto out_denied_free; 1147 } 1148 } 1149 1150 length = min_t(unsigned int, inlen, (char *)xdr->end - (char *)xdr->p); 1151 memcpy(page_address(in_token->pages[0]), xdr->p, length); 1152 inlen -= length; 1153 1154 to_offs = length; 1155 from_offs = rqstp->rq_arg.page_base; 1156 while (inlen) { 1157 pgto = to_offs >> PAGE_SHIFT; 1158 pgfrom = from_offs >> PAGE_SHIFT; 1159 pgto_offs = to_offs & ~PAGE_MASK; 1160 pgfrom_offs = from_offs & ~PAGE_MASK; 1161 1162 length = min_t(unsigned int, inlen, 1163 min_t(unsigned int, PAGE_SIZE - pgto_offs, 1164 PAGE_SIZE - pgfrom_offs)); 1165 memcpy(page_address(in_token->pages[pgto]) + pgto_offs, 1166 page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs, 1167 length); 1168 1169 to_offs += length; 1170 from_offs += length; 1171 inlen -= length; 1172 } 1173 return 0; 1174 1175 out_denied_free: 1176 kfree(in_handle->data); 1177 return SVC_DENIED; 1178 } 1179 1180 static inline int 1181 gss_write_resv(struct kvec *resv, size_t size_limit, 1182 struct xdr_netobj *out_handle, struct xdr_netobj *out_token, 1183 int major_status, int minor_status) 1184 { 1185 if (resv->iov_len + 4 > size_limit) 1186 return -1; 1187 svc_putnl(resv, RPC_SUCCESS); 1188 if (svc_safe_putnetobj(resv, out_handle)) 1189 return -1; 1190 if (resv->iov_len + 3 * 4 > size_limit) 1191 return -1; 1192 svc_putnl(resv, major_status); 1193 svc_putnl(resv, minor_status); 1194 svc_putnl(resv, GSS_SEQ_WIN); 1195 if (svc_safe_putnetobj(resv, out_token)) 1196 return -1; 1197 return 0; 1198 } 1199 1200 /* 1201 * Having read the cred already and found we're in the context 1202 * initiation case, read the verifier and initiate (or check the results 1203 * of) upcalls to userspace for help with context initiation. If 1204 * the upcall results are available, write the verifier and result. 1205 * Otherwise, drop the request pending an answer to the upcall. 1206 */ 1207 static int 1208 svcauth_gss_legacy_init(struct svc_rqst *rqstp, 1209 struct rpc_gss_wire_cred *gc) 1210 { 1211 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 1212 struct kvec *resv = &rqstp->rq_res.head[0]; 1213 struct rsi *rsip, rsikey; 1214 __be32 *p; 1215 u32 len; 1216 int ret; 1217 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1218 1219 memset(&rsikey, 0, sizeof(rsikey)); 1220 if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) 1221 return SVC_CLOSE; 1222 1223 /* 1224 * RFC 2203 Section 5.2.2 1225 * 1226 * struct rpc_gss_init_arg { 1227 * opaque gss_token<>; 1228 * }; 1229 */ 1230 if (xdr_stream_decode_u32(xdr, &len) < 0) { 1231 kfree(rsikey.in_handle.data); 1232 return SVC_DENIED; 1233 } 1234 p = xdr_inline_decode(xdr, len); 1235 if (!p) { 1236 kfree(rsikey.in_handle.data); 1237 return SVC_DENIED; 1238 } 1239 rsikey.in_token.data = kmalloc(len, GFP_KERNEL); 1240 if (ZERO_OR_NULL_PTR(rsikey.in_token.data)) { 1241 kfree(rsikey.in_handle.data); 1242 return SVC_CLOSE; 1243 } 1244 memcpy(rsikey.in_token.data, p, len); 1245 rsikey.in_token.len = len; 1246 1247 /* Perform upcall, or find upcall result: */ 1248 rsip = rsi_lookup(sn->rsi_cache, &rsikey); 1249 rsi_free(&rsikey); 1250 if (!rsip) 1251 return SVC_CLOSE; 1252 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 1253 /* No upcall result: */ 1254 return SVC_CLOSE; 1255 1256 ret = SVC_CLOSE; 1257 /* Got an answer to the upcall; use it: */ 1258 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1259 &rsip->out_handle, &rsip->major_status)) 1260 goto out; 1261 if (gss_write_resv(resv, PAGE_SIZE, 1262 &rsip->out_handle, &rsip->out_token, 1263 rsip->major_status, rsip->minor_status)) 1264 goto out; 1265 1266 ret = SVC_COMPLETE; 1267 out: 1268 cache_put(&rsip->h, sn->rsi_cache); 1269 return ret; 1270 } 1271 1272 static int gss_proxy_save_rsc(struct cache_detail *cd, 1273 struct gssp_upcall_data *ud, 1274 uint64_t *handle) 1275 { 1276 struct rsc rsci, *rscp = NULL; 1277 static atomic64_t ctxhctr; 1278 long long ctxh; 1279 struct gss_api_mech *gm = NULL; 1280 time64_t expiry; 1281 int status; 1282 1283 memset(&rsci, 0, sizeof(rsci)); 1284 /* context handle */ 1285 status = -ENOMEM; 1286 /* the handle needs to be just a unique id, 1287 * use a static counter */ 1288 ctxh = atomic64_inc_return(&ctxhctr); 1289 1290 /* make a copy for the caller */ 1291 *handle = ctxh; 1292 1293 /* make a copy for the rsc cache */ 1294 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t))) 1295 goto out; 1296 rscp = rsc_lookup(cd, &rsci); 1297 if (!rscp) 1298 goto out; 1299 1300 /* creds */ 1301 if (!ud->found_creds) { 1302 /* userspace seem buggy, we should always get at least a 1303 * mapping to nobody */ 1304 goto out; 1305 } else { 1306 struct timespec64 boot; 1307 1308 /* steal creds */ 1309 rsci.cred = ud->creds; 1310 memset(&ud->creds, 0, sizeof(struct svc_cred)); 1311 1312 status = -EOPNOTSUPP; 1313 /* get mech handle from OID */ 1314 gm = gss_mech_get_by_OID(&ud->mech_oid); 1315 if (!gm) 1316 goto out; 1317 rsci.cred.cr_gss_mech = gm; 1318 1319 status = -EINVAL; 1320 /* mech-specific data: */ 1321 status = gss_import_sec_context(ud->out_handle.data, 1322 ud->out_handle.len, 1323 gm, &rsci.mechctx, 1324 &expiry, GFP_KERNEL); 1325 if (status) 1326 goto out; 1327 1328 getboottime64(&boot); 1329 expiry -= boot.tv_sec; 1330 } 1331 1332 rsci.h.expiry_time = expiry; 1333 rscp = rsc_update(cd, &rsci, rscp); 1334 status = 0; 1335 out: 1336 rsc_free(&rsci); 1337 if (rscp) 1338 cache_put(&rscp->h, cd); 1339 else 1340 status = -ENOMEM; 1341 return status; 1342 } 1343 1344 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp, 1345 struct rpc_gss_wire_cred *gc) 1346 { 1347 struct kvec *resv = &rqstp->rq_res.head[0]; 1348 struct xdr_netobj cli_handle; 1349 struct gssp_upcall_data ud; 1350 uint64_t handle; 1351 int status; 1352 int ret; 1353 struct net *net = SVC_NET(rqstp); 1354 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1355 1356 memset(&ud, 0, sizeof(ud)); 1357 ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token); 1358 if (ret) 1359 return ret; 1360 1361 ret = SVC_CLOSE; 1362 1363 /* Perform synchronous upcall to gss-proxy */ 1364 status = gssp_accept_sec_context_upcall(net, &ud); 1365 if (status) 1366 goto out; 1367 1368 trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status); 1369 1370 switch (ud.major_status) { 1371 case GSS_S_CONTINUE_NEEDED: 1372 cli_handle = ud.out_handle; 1373 break; 1374 case GSS_S_COMPLETE: 1375 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle); 1376 if (status) 1377 goto out; 1378 cli_handle.data = (u8 *)&handle; 1379 cli_handle.len = sizeof(handle); 1380 break; 1381 default: 1382 goto out; 1383 } 1384 1385 /* Got an answer to the upcall; use it: */ 1386 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1387 &cli_handle, &ud.major_status)) 1388 goto out; 1389 if (gss_write_resv(resv, PAGE_SIZE, 1390 &cli_handle, &ud.out_token, 1391 ud.major_status, ud.minor_status)) 1392 goto out; 1393 1394 ret = SVC_COMPLETE; 1395 out: 1396 gss_free_in_token_pages(&ud.in_token); 1397 gssp_free_upcall_data(&ud); 1398 return ret; 1399 } 1400 1401 /* 1402 * Try to set the sn->use_gss_proxy variable to a new value. We only allow 1403 * it to be changed if it's currently undefined (-1). If it's any other value 1404 * then return -EBUSY unless the type wouldn't have changed anyway. 1405 */ 1406 static int set_gss_proxy(struct net *net, int type) 1407 { 1408 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1409 int ret; 1410 1411 WARN_ON_ONCE(type != 0 && type != 1); 1412 ret = cmpxchg(&sn->use_gss_proxy, -1, type); 1413 if (ret != -1 && ret != type) 1414 return -EBUSY; 1415 return 0; 1416 } 1417 1418 static bool use_gss_proxy(struct net *net) 1419 { 1420 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1421 1422 /* If use_gss_proxy is still undefined, then try to disable it */ 1423 if (sn->use_gss_proxy == -1) 1424 set_gss_proxy(net, 0); 1425 return sn->use_gss_proxy; 1426 } 1427 1428 static noinline_for_stack int 1429 svcauth_gss_proc_init(struct svc_rqst *rqstp, struct rpc_gss_wire_cred *gc) 1430 { 1431 struct xdr_stream *xdr = &rqstp->rq_arg_stream; 1432 u32 flavor, len; 1433 void *body; 1434 1435 svcxdr_init_decode(rqstp); 1436 1437 /* Call's verf field: */ 1438 if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0) 1439 return SVC_GARBAGE; 1440 if (flavor != RPC_AUTH_NULL || len != 0) { 1441 rqstp->rq_auth_stat = rpc_autherr_badverf; 1442 return SVC_DENIED; 1443 } 1444 1445 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) { 1446 rqstp->rq_auth_stat = rpc_autherr_badcred; 1447 return SVC_DENIED; 1448 } 1449 1450 if (!use_gss_proxy(SVC_NET(rqstp))) 1451 return svcauth_gss_legacy_init(rqstp, gc); 1452 return svcauth_gss_proxy_init(rqstp, gc); 1453 } 1454 1455 #ifdef CONFIG_PROC_FS 1456 1457 static ssize_t write_gssp(struct file *file, const char __user *buf, 1458 size_t count, loff_t *ppos) 1459 { 1460 struct net *net = pde_data(file_inode(file)); 1461 char tbuf[20]; 1462 unsigned long i; 1463 int res; 1464 1465 if (*ppos || count > sizeof(tbuf)-1) 1466 return -EINVAL; 1467 if (copy_from_user(tbuf, buf, count)) 1468 return -EFAULT; 1469 1470 tbuf[count] = 0; 1471 res = kstrtoul(tbuf, 0, &i); 1472 if (res) 1473 return res; 1474 if (i != 1) 1475 return -EINVAL; 1476 res = set_gssp_clnt(net); 1477 if (res) 1478 return res; 1479 res = set_gss_proxy(net, 1); 1480 if (res) 1481 return res; 1482 return count; 1483 } 1484 1485 static ssize_t read_gssp(struct file *file, char __user *buf, 1486 size_t count, loff_t *ppos) 1487 { 1488 struct net *net = pde_data(file_inode(file)); 1489 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1490 unsigned long p = *ppos; 1491 char tbuf[10]; 1492 size_t len; 1493 1494 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy); 1495 len = strlen(tbuf); 1496 if (p >= len) 1497 return 0; 1498 len -= p; 1499 if (len > count) 1500 len = count; 1501 if (copy_to_user(buf, (void *)(tbuf+p), len)) 1502 return -EFAULT; 1503 *ppos += len; 1504 return len; 1505 } 1506 1507 static const struct proc_ops use_gss_proxy_proc_ops = { 1508 .proc_open = nonseekable_open, 1509 .proc_write = write_gssp, 1510 .proc_read = read_gssp, 1511 }; 1512 1513 static int create_use_gss_proxy_proc_entry(struct net *net) 1514 { 1515 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1516 struct proc_dir_entry **p = &sn->use_gssp_proc; 1517 1518 sn->use_gss_proxy = -1; 1519 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600, 1520 sn->proc_net_rpc, 1521 &use_gss_proxy_proc_ops, net); 1522 if (!*p) 1523 return -ENOMEM; 1524 init_gssp_clnt(sn); 1525 return 0; 1526 } 1527 1528 static void destroy_use_gss_proxy_proc_entry(struct net *net) 1529 { 1530 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1531 1532 if (sn->use_gssp_proc) { 1533 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc); 1534 clear_gssp_clnt(sn); 1535 } 1536 } 1537 #else /* CONFIG_PROC_FS */ 1538 1539 static int create_use_gss_proxy_proc_entry(struct net *net) 1540 { 1541 return 0; 1542 } 1543 1544 static void destroy_use_gss_proxy_proc_entry(struct net *net) {} 1545 1546 #endif /* CONFIG_PROC_FS */ 1547 1548 /* 1549 * Accept an rpcsec packet. 1550 * If context establishment, punt to user space 1551 * If data exchange, verify/decrypt 1552 * If context destruction, handle here 1553 * In the context establishment and destruction case we encode 1554 * response here and return SVC_COMPLETE. 1555 */ 1556 static int 1557 svcauth_gss_accept(struct svc_rqst *rqstp) 1558 { 1559 struct kvec *argv = &rqstp->rq_arg.head[0]; 1560 struct kvec *resv = &rqstp->rq_res.head[0]; 1561 u32 crlen; 1562 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1563 struct rpc_gss_wire_cred *gc; 1564 struct rsc *rsci = NULL; 1565 __be32 *rpcstart; 1566 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1567 int ret; 1568 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1569 1570 rqstp->rq_auth_stat = rpc_autherr_badcred; 1571 if (!svcdata) 1572 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1573 if (!svcdata) 1574 goto auth_err; 1575 rqstp->rq_auth_data = svcdata; 1576 svcdata->verf_start = NULL; 1577 svcdata->rsci = NULL; 1578 gc = &svcdata->clcred; 1579 1580 /* start of rpc packet is 7 u32's back from here: 1581 * xid direction rpcversion prog vers proc flavour 1582 */ 1583 rpcstart = argv->iov_base; 1584 rpcstart -= 7; 1585 1586 /* credential is: 1587 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1588 * at least 5 u32s, and is preceded by length, so that makes 6. 1589 */ 1590 1591 if (argv->iov_len < 5 * 4) 1592 goto auth_err; 1593 crlen = svc_getnl(argv); 1594 if (svc_getnl(argv) != RPC_GSS_VERSION) 1595 goto auth_err; 1596 gc->gc_proc = svc_getnl(argv); 1597 gc->gc_seq = svc_getnl(argv); 1598 gc->gc_svc = svc_getnl(argv); 1599 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1600 goto auth_err; 1601 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1602 goto auth_err; 1603 1604 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1605 goto auth_err; 1606 1607 rqstp->rq_auth_stat = rpc_autherr_badverf; 1608 switch (gc->gc_proc) { 1609 case RPC_GSS_PROC_INIT: 1610 case RPC_GSS_PROC_CONTINUE_INIT: 1611 return svcauth_gss_proc_init(rqstp, gc); 1612 case RPC_GSS_PROC_DATA: 1613 case RPC_GSS_PROC_DESTROY: 1614 /* Look up the context, and check the verifier: */ 1615 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem; 1616 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 1617 if (!rsci) 1618 goto auth_err; 1619 switch (gss_verify_header(rqstp, rsci, rpcstart, gc)) { 1620 case SVC_OK: 1621 break; 1622 case SVC_DENIED: 1623 goto auth_err; 1624 case SVC_DROP: 1625 goto drop; 1626 } 1627 break; 1628 default: 1629 rqstp->rq_auth_stat = rpc_autherr_rejectedcred; 1630 goto auth_err; 1631 } 1632 1633 /* now act upon the command: */ 1634 switch (gc->gc_proc) { 1635 case RPC_GSS_PROC_DESTROY: 1636 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1637 goto auth_err; 1638 /* Delete the entry from the cache_list and call cache_put */ 1639 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h); 1640 if (resv->iov_len + 4 > PAGE_SIZE) 1641 goto drop; 1642 svc_putnl(resv, RPC_SUCCESS); 1643 goto complete; 1644 case RPC_GSS_PROC_DATA: 1645 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem; 1646 svcdata->verf_start = resv->iov_base + resv->iov_len; 1647 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1648 goto auth_err; 1649 rqstp->rq_cred = rsci->cred; 1650 get_group_info(rsci->cred.cr_group_info); 1651 rqstp->rq_auth_stat = rpc_autherr_badcred; 1652 switch (gc->gc_svc) { 1653 case RPC_GSS_SVC_NONE: 1654 svcxdr_init_decode(rqstp); 1655 break; 1656 case RPC_GSS_SVC_INTEGRITY: 1657 /* placeholders for length and seq. number: */ 1658 svc_putnl(resv, 0); 1659 svc_putnl(resv, 0); 1660 if (unwrap_integ_data(rqstp, &rqstp->rq_arg, 1661 gc->gc_seq, rsci->mechctx)) 1662 goto garbage_args; 1663 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE; 1664 svcxdr_init_decode(rqstp); 1665 break; 1666 case RPC_GSS_SVC_PRIVACY: 1667 /* placeholders for length and seq. number: */ 1668 svc_putnl(resv, 0); 1669 svc_putnl(resv, 0); 1670 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1671 gc->gc_seq, rsci->mechctx)) 1672 goto garbage_args; 1673 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2; 1674 svcxdr_init_decode(rqstp); 1675 break; 1676 default: 1677 goto auth_err; 1678 } 1679 svcdata->rsci = rsci; 1680 cache_get(&rsci->h); 1681 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( 1682 rsci->mechctx->mech_type, 1683 GSS_C_QOP_DEFAULT, 1684 gc->gc_svc); 1685 ret = SVC_OK; 1686 trace_rpcgss_svc_authenticate(rqstp, gc); 1687 goto out; 1688 } 1689 garbage_args: 1690 ret = SVC_GARBAGE; 1691 goto out; 1692 auth_err: 1693 /* Restore write pointer to its original value: */ 1694 xdr_ressize_check(rqstp, reject_stat); 1695 ret = SVC_DENIED; 1696 goto out; 1697 complete: 1698 ret = SVC_COMPLETE; 1699 goto out; 1700 drop: 1701 ret = SVC_CLOSE; 1702 out: 1703 if (rsci) 1704 cache_put(&rsci->h, sn->rsc_cache); 1705 return ret; 1706 } 1707 1708 static __be32 * 1709 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1710 { 1711 __be32 *p; 1712 u32 verf_len; 1713 1714 p = gsd->verf_start; 1715 gsd->verf_start = NULL; 1716 1717 /* If the reply stat is nonzero, don't wrap: */ 1718 if (*(p-1) != rpc_success) 1719 return NULL; 1720 /* Skip the verifier: */ 1721 p += 1; 1722 verf_len = ntohl(*p++); 1723 p += XDR_QUADLEN(verf_len); 1724 /* move accept_stat to right place: */ 1725 memcpy(p, p + 2, 4); 1726 /* Also don't wrap if the accept stat is nonzero: */ 1727 if (*p != rpc_success) { 1728 resbuf->head[0].iov_len -= 2 * 4; 1729 return NULL; 1730 } 1731 p++; 1732 return p; 1733 } 1734 1735 static inline int 1736 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1737 { 1738 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1739 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1740 struct xdr_buf *resbuf = &rqstp->rq_res; 1741 struct xdr_buf integ_buf; 1742 struct xdr_netobj mic; 1743 struct kvec *resv; 1744 __be32 *p; 1745 int integ_offset, integ_len; 1746 int stat = -EINVAL; 1747 1748 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1749 if (p == NULL) 1750 goto out; 1751 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1752 integ_len = resbuf->len - integ_offset; 1753 if (integ_len & 3) 1754 goto out; 1755 *p++ = htonl(integ_len); 1756 *p++ = htonl(gc->gc_seq); 1757 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) { 1758 WARN_ON_ONCE(1); 1759 goto out_err; 1760 } 1761 if (resbuf->tail[0].iov_base == NULL) { 1762 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1763 goto out_err; 1764 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1765 + resbuf->head[0].iov_len; 1766 resbuf->tail[0].iov_len = 0; 1767 } 1768 resv = &resbuf->tail[0]; 1769 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1770 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1771 goto out_err; 1772 svc_putnl(resv, mic.len); 1773 memset(mic.data + mic.len, 0, 1774 round_up_to_quad(mic.len) - mic.len); 1775 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1776 /* not strictly required: */ 1777 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1778 if (resv->iov_len > PAGE_SIZE) 1779 goto out_err; 1780 out: 1781 stat = 0; 1782 out_err: 1783 return stat; 1784 } 1785 1786 static inline int 1787 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1788 { 1789 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1790 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1791 struct xdr_buf *resbuf = &rqstp->rq_res; 1792 struct page **inpages = NULL; 1793 __be32 *p, *len; 1794 int offset; 1795 int pad; 1796 1797 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1798 if (p == NULL) 1799 return 0; 1800 len = p++; 1801 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1802 *p++ = htonl(gc->gc_seq); 1803 inpages = resbuf->pages; 1804 /* XXX: Would be better to write some xdr helper functions for 1805 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1806 1807 /* 1808 * If there is currently tail data, make sure there is 1809 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1810 * the page, and move the current tail data such that 1811 * there is RPC_MAX_AUTH_SIZE slack space available in 1812 * both the head and tail. 1813 */ 1814 if (resbuf->tail[0].iov_base) { 1815 if (resbuf->tail[0].iov_base >= 1816 resbuf->head[0].iov_base + PAGE_SIZE) 1817 return -EINVAL; 1818 if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base) 1819 return -EINVAL; 1820 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1821 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1822 return -ENOMEM; 1823 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1824 resbuf->tail[0].iov_base, 1825 resbuf->tail[0].iov_len); 1826 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1827 } 1828 /* 1829 * If there is no current tail data, make sure there is 1830 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1831 * allotted page, and set up tail information such that there 1832 * is RPC_MAX_AUTH_SIZE slack space available in both the 1833 * head and tail. 1834 */ 1835 if (resbuf->tail[0].iov_base == NULL) { 1836 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1837 return -ENOMEM; 1838 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1839 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1840 resbuf->tail[0].iov_len = 0; 1841 } 1842 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1843 return -ENOMEM; 1844 *len = htonl(resbuf->len - offset); 1845 pad = 3 - ((resbuf->len - offset - 1)&3); 1846 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1847 memset(p, 0, pad); 1848 resbuf->tail[0].iov_len += pad; 1849 resbuf->len += pad; 1850 return 0; 1851 } 1852 1853 static int 1854 svcauth_gss_release(struct svc_rqst *rqstp) 1855 { 1856 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1857 struct rpc_gss_wire_cred *gc; 1858 struct xdr_buf *resbuf = &rqstp->rq_res; 1859 int stat = -EINVAL; 1860 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1861 1862 if (!gsd) 1863 goto out; 1864 gc = &gsd->clcred; 1865 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1866 goto out; 1867 /* Release can be called twice, but we only wrap once. */ 1868 if (gsd->verf_start == NULL) 1869 goto out; 1870 /* normally not set till svc_send, but we need it here: */ 1871 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1872 * or whatever? */ 1873 resbuf->len = total_buf_len(resbuf); 1874 switch (gc->gc_svc) { 1875 case RPC_GSS_SVC_NONE: 1876 break; 1877 case RPC_GSS_SVC_INTEGRITY: 1878 stat = svcauth_gss_wrap_resp_integ(rqstp); 1879 if (stat) 1880 goto out_err; 1881 break; 1882 case RPC_GSS_SVC_PRIVACY: 1883 stat = svcauth_gss_wrap_resp_priv(rqstp); 1884 if (stat) 1885 goto out_err; 1886 break; 1887 /* 1888 * For any other gc_svc value, svcauth_gss_accept() already set 1889 * the auth_error appropriately; just fall through: 1890 */ 1891 } 1892 1893 out: 1894 stat = 0; 1895 out_err: 1896 if (rqstp->rq_client) 1897 auth_domain_put(rqstp->rq_client); 1898 rqstp->rq_client = NULL; 1899 if (rqstp->rq_gssclient) 1900 auth_domain_put(rqstp->rq_gssclient); 1901 rqstp->rq_gssclient = NULL; 1902 if (rqstp->rq_cred.cr_group_info) 1903 put_group_info(rqstp->rq_cred.cr_group_info); 1904 rqstp->rq_cred.cr_group_info = NULL; 1905 if (gsd && gsd->rsci) { 1906 cache_put(&gsd->rsci->h, sn->rsc_cache); 1907 gsd->rsci = NULL; 1908 } 1909 return stat; 1910 } 1911 1912 static void 1913 svcauth_gss_domain_release_rcu(struct rcu_head *head) 1914 { 1915 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head); 1916 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1917 1918 kfree(dom->name); 1919 kfree(gd); 1920 } 1921 1922 static void 1923 svcauth_gss_domain_release(struct auth_domain *dom) 1924 { 1925 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu); 1926 } 1927 1928 static struct auth_ops svcauthops_gss = { 1929 .name = "rpcsec_gss", 1930 .owner = THIS_MODULE, 1931 .flavour = RPC_AUTH_GSS, 1932 .accept = svcauth_gss_accept, 1933 .release = svcauth_gss_release, 1934 .domain_release = svcauth_gss_domain_release, 1935 .set_client = svcauth_gss_set_client, 1936 }; 1937 1938 static int rsi_cache_create_net(struct net *net) 1939 { 1940 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1941 struct cache_detail *cd; 1942 int err; 1943 1944 cd = cache_create_net(&rsi_cache_template, net); 1945 if (IS_ERR(cd)) 1946 return PTR_ERR(cd); 1947 err = cache_register_net(cd, net); 1948 if (err) { 1949 cache_destroy_net(cd, net); 1950 return err; 1951 } 1952 sn->rsi_cache = cd; 1953 return 0; 1954 } 1955 1956 static void rsi_cache_destroy_net(struct net *net) 1957 { 1958 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1959 struct cache_detail *cd = sn->rsi_cache; 1960 1961 sn->rsi_cache = NULL; 1962 cache_purge(cd); 1963 cache_unregister_net(cd, net); 1964 cache_destroy_net(cd, net); 1965 } 1966 1967 static int rsc_cache_create_net(struct net *net) 1968 { 1969 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1970 struct cache_detail *cd; 1971 int err; 1972 1973 cd = cache_create_net(&rsc_cache_template, net); 1974 if (IS_ERR(cd)) 1975 return PTR_ERR(cd); 1976 err = cache_register_net(cd, net); 1977 if (err) { 1978 cache_destroy_net(cd, net); 1979 return err; 1980 } 1981 sn->rsc_cache = cd; 1982 return 0; 1983 } 1984 1985 static void rsc_cache_destroy_net(struct net *net) 1986 { 1987 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1988 struct cache_detail *cd = sn->rsc_cache; 1989 1990 sn->rsc_cache = NULL; 1991 cache_purge(cd); 1992 cache_unregister_net(cd, net); 1993 cache_destroy_net(cd, net); 1994 } 1995 1996 int 1997 gss_svc_init_net(struct net *net) 1998 { 1999 int rv; 2000 2001 rv = rsc_cache_create_net(net); 2002 if (rv) 2003 return rv; 2004 rv = rsi_cache_create_net(net); 2005 if (rv) 2006 goto out1; 2007 rv = create_use_gss_proxy_proc_entry(net); 2008 if (rv) 2009 goto out2; 2010 return 0; 2011 out2: 2012 rsi_cache_destroy_net(net); 2013 out1: 2014 rsc_cache_destroy_net(net); 2015 return rv; 2016 } 2017 2018 void 2019 gss_svc_shutdown_net(struct net *net) 2020 { 2021 destroy_use_gss_proxy_proc_entry(net); 2022 rsi_cache_destroy_net(net); 2023 rsc_cache_destroy_net(net); 2024 } 2025 2026 int 2027 gss_svc_init(void) 2028 { 2029 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 2030 } 2031 2032 void 2033 gss_svc_shutdown(void) 2034 { 2035 svc_auth_unregister(RPC_AUTH_GSS); 2036 } 2037