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 inline int 1094 gss_read_common_verf(struct rpc_gss_wire_cred *gc, 1095 struct kvec *argv, __be32 *authp, 1096 struct xdr_netobj *in_handle) 1097 { 1098 if (dup_netobj(in_handle, &gc->gc_ctx)) 1099 return SVC_CLOSE; 1100 *authp = rpc_autherr_badverf; 1101 1102 return 0; 1103 } 1104 1105 static inline int 1106 gss_read_verf(struct rpc_gss_wire_cred *gc, 1107 struct kvec *argv, __be32 *authp, 1108 struct xdr_netobj *in_handle, 1109 struct xdr_netobj *in_token) 1110 { 1111 struct xdr_netobj tmpobj; 1112 int res; 1113 1114 res = gss_read_common_verf(gc, argv, authp, in_handle); 1115 if (res) 1116 return res; 1117 1118 if (svc_safe_getnetobj(argv, &tmpobj)) { 1119 kfree(in_handle->data); 1120 return SVC_DENIED; 1121 } 1122 if (dup_netobj(in_token, &tmpobj)) { 1123 kfree(in_handle->data); 1124 return SVC_CLOSE; 1125 } 1126 1127 return 0; 1128 } 1129 1130 static void gss_free_in_token_pages(struct gssp_in_token *in_token) 1131 { 1132 u32 inlen; 1133 int i; 1134 1135 i = 0; 1136 inlen = in_token->page_len; 1137 while (inlen) { 1138 if (in_token->pages[i]) 1139 put_page(in_token->pages[i]); 1140 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen; 1141 } 1142 1143 kfree(in_token->pages); 1144 in_token->pages = NULL; 1145 } 1146 1147 static int gss_read_proxy_verf(struct svc_rqst *rqstp, 1148 struct rpc_gss_wire_cred *gc, 1149 struct xdr_netobj *in_handle, 1150 struct gssp_in_token *in_token) 1151 { 1152 struct kvec *argv = &rqstp->rq_arg.head[0]; 1153 unsigned int length, pgto_offs, pgfrom_offs; 1154 int pages, i, res, pgto, pgfrom; 1155 size_t inlen, to_offs, from_offs; 1156 1157 res = gss_read_common_verf(gc, argv, &rqstp->rq_auth_stat, in_handle); 1158 if (res) 1159 return res; 1160 1161 inlen = svc_getnl(argv); 1162 if (inlen > (argv->iov_len + rqstp->rq_arg.page_len)) { 1163 kfree(in_handle->data); 1164 return SVC_DENIED; 1165 } 1166 1167 pages = DIV_ROUND_UP(inlen, PAGE_SIZE); 1168 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL); 1169 if (!in_token->pages) { 1170 kfree(in_handle->data); 1171 return SVC_DENIED; 1172 } 1173 in_token->page_base = 0; 1174 in_token->page_len = inlen; 1175 for (i = 0; i < pages; i++) { 1176 in_token->pages[i] = alloc_page(GFP_KERNEL); 1177 if (!in_token->pages[i]) { 1178 kfree(in_handle->data); 1179 gss_free_in_token_pages(in_token); 1180 return SVC_DENIED; 1181 } 1182 } 1183 1184 length = min_t(unsigned int, inlen, argv->iov_len); 1185 memcpy(page_address(in_token->pages[0]), argv->iov_base, length); 1186 inlen -= length; 1187 1188 to_offs = length; 1189 from_offs = rqstp->rq_arg.page_base; 1190 while (inlen) { 1191 pgto = to_offs >> PAGE_SHIFT; 1192 pgfrom = from_offs >> PAGE_SHIFT; 1193 pgto_offs = to_offs & ~PAGE_MASK; 1194 pgfrom_offs = from_offs & ~PAGE_MASK; 1195 1196 length = min_t(unsigned int, inlen, 1197 min_t(unsigned int, PAGE_SIZE - pgto_offs, 1198 PAGE_SIZE - pgfrom_offs)); 1199 memcpy(page_address(in_token->pages[pgto]) + pgto_offs, 1200 page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs, 1201 length); 1202 1203 to_offs += length; 1204 from_offs += length; 1205 inlen -= length; 1206 } 1207 return 0; 1208 } 1209 1210 static inline int 1211 gss_write_resv(struct kvec *resv, size_t size_limit, 1212 struct xdr_netobj *out_handle, struct xdr_netobj *out_token, 1213 int major_status, int minor_status) 1214 { 1215 if (resv->iov_len + 4 > size_limit) 1216 return -1; 1217 svc_putnl(resv, RPC_SUCCESS); 1218 if (svc_safe_putnetobj(resv, out_handle)) 1219 return -1; 1220 if (resv->iov_len + 3 * 4 > size_limit) 1221 return -1; 1222 svc_putnl(resv, major_status); 1223 svc_putnl(resv, minor_status); 1224 svc_putnl(resv, GSS_SEQ_WIN); 1225 if (svc_safe_putnetobj(resv, out_token)) 1226 return -1; 1227 return 0; 1228 } 1229 1230 /* 1231 * Having read the cred already and found we're in the context 1232 * initiation case, read the verifier and initiate (or check the results 1233 * of) upcalls to userspace for help with context initiation. If 1234 * the upcall results are available, write the verifier and result. 1235 * Otherwise, drop the request pending an answer to the upcall. 1236 */ 1237 static int svcauth_gss_legacy_init(struct svc_rqst *rqstp, 1238 struct rpc_gss_wire_cred *gc) 1239 { 1240 struct kvec *argv = &rqstp->rq_arg.head[0]; 1241 struct kvec *resv = &rqstp->rq_res.head[0]; 1242 struct rsi *rsip, rsikey; 1243 int ret; 1244 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1245 1246 memset(&rsikey, 0, sizeof(rsikey)); 1247 ret = gss_read_verf(gc, argv, &rqstp->rq_auth_stat, 1248 &rsikey.in_handle, &rsikey.in_token); 1249 if (ret) 1250 return ret; 1251 1252 /* Perform upcall, or find upcall result: */ 1253 rsip = rsi_lookup(sn->rsi_cache, &rsikey); 1254 rsi_free(&rsikey); 1255 if (!rsip) 1256 return SVC_CLOSE; 1257 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 1258 /* No upcall result: */ 1259 return SVC_CLOSE; 1260 1261 ret = SVC_CLOSE; 1262 /* Got an answer to the upcall; use it: */ 1263 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1264 &rsip->out_handle, &rsip->major_status)) 1265 goto out; 1266 if (gss_write_resv(resv, PAGE_SIZE, 1267 &rsip->out_handle, &rsip->out_token, 1268 rsip->major_status, rsip->minor_status)) 1269 goto out; 1270 1271 svcxdr_init_decode(rqstp); 1272 ret = SVC_COMPLETE; 1273 out: 1274 cache_put(&rsip->h, sn->rsi_cache); 1275 return ret; 1276 } 1277 1278 static int gss_proxy_save_rsc(struct cache_detail *cd, 1279 struct gssp_upcall_data *ud, 1280 uint64_t *handle) 1281 { 1282 struct rsc rsci, *rscp = NULL; 1283 static atomic64_t ctxhctr; 1284 long long ctxh; 1285 struct gss_api_mech *gm = NULL; 1286 time64_t expiry; 1287 int status; 1288 1289 memset(&rsci, 0, sizeof(rsci)); 1290 /* context handle */ 1291 status = -ENOMEM; 1292 /* the handle needs to be just a unique id, 1293 * use a static counter */ 1294 ctxh = atomic64_inc_return(&ctxhctr); 1295 1296 /* make a copy for the caller */ 1297 *handle = ctxh; 1298 1299 /* make a copy for the rsc cache */ 1300 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t))) 1301 goto out; 1302 rscp = rsc_lookup(cd, &rsci); 1303 if (!rscp) 1304 goto out; 1305 1306 /* creds */ 1307 if (!ud->found_creds) { 1308 /* userspace seem buggy, we should always get at least a 1309 * mapping to nobody */ 1310 goto out; 1311 } else { 1312 struct timespec64 boot; 1313 1314 /* steal creds */ 1315 rsci.cred = ud->creds; 1316 memset(&ud->creds, 0, sizeof(struct svc_cred)); 1317 1318 status = -EOPNOTSUPP; 1319 /* get mech handle from OID */ 1320 gm = gss_mech_get_by_OID(&ud->mech_oid); 1321 if (!gm) 1322 goto out; 1323 rsci.cred.cr_gss_mech = gm; 1324 1325 status = -EINVAL; 1326 /* mech-specific data: */ 1327 status = gss_import_sec_context(ud->out_handle.data, 1328 ud->out_handle.len, 1329 gm, &rsci.mechctx, 1330 &expiry, GFP_KERNEL); 1331 if (status) 1332 goto out; 1333 1334 getboottime64(&boot); 1335 expiry -= boot.tv_sec; 1336 } 1337 1338 rsci.h.expiry_time = expiry; 1339 rscp = rsc_update(cd, &rsci, rscp); 1340 status = 0; 1341 out: 1342 rsc_free(&rsci); 1343 if (rscp) 1344 cache_put(&rscp->h, cd); 1345 else 1346 status = -ENOMEM; 1347 return status; 1348 } 1349 1350 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp, 1351 struct rpc_gss_wire_cred *gc) 1352 { 1353 struct kvec *resv = &rqstp->rq_res.head[0]; 1354 struct xdr_netobj cli_handle; 1355 struct gssp_upcall_data ud; 1356 uint64_t handle; 1357 int status; 1358 int ret; 1359 struct net *net = SVC_NET(rqstp); 1360 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1361 1362 memset(&ud, 0, sizeof(ud)); 1363 ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token); 1364 if (ret) 1365 return ret; 1366 1367 ret = SVC_CLOSE; 1368 1369 /* Perform synchronous upcall to gss-proxy */ 1370 status = gssp_accept_sec_context_upcall(net, &ud); 1371 if (status) 1372 goto out; 1373 1374 trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status); 1375 1376 switch (ud.major_status) { 1377 case GSS_S_CONTINUE_NEEDED: 1378 cli_handle = ud.out_handle; 1379 break; 1380 case GSS_S_COMPLETE: 1381 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle); 1382 if (status) 1383 goto out; 1384 cli_handle.data = (u8 *)&handle; 1385 cli_handle.len = sizeof(handle); 1386 break; 1387 default: 1388 goto out; 1389 } 1390 1391 /* Got an answer to the upcall; use it: */ 1392 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1393 &cli_handle, &ud.major_status)) 1394 goto out; 1395 if (gss_write_resv(resv, PAGE_SIZE, 1396 &cli_handle, &ud.out_token, 1397 ud.major_status, ud.minor_status)) 1398 goto out; 1399 1400 svcxdr_init_decode(rqstp); 1401 ret = SVC_COMPLETE; 1402 out: 1403 gss_free_in_token_pages(&ud.in_token); 1404 gssp_free_upcall_data(&ud); 1405 return ret; 1406 } 1407 1408 /* 1409 * Try to set the sn->use_gss_proxy variable to a new value. We only allow 1410 * it to be changed if it's currently undefined (-1). If it's any other value 1411 * then return -EBUSY unless the type wouldn't have changed anyway. 1412 */ 1413 static int set_gss_proxy(struct net *net, int type) 1414 { 1415 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1416 int ret; 1417 1418 WARN_ON_ONCE(type != 0 && type != 1); 1419 ret = cmpxchg(&sn->use_gss_proxy, -1, type); 1420 if (ret != -1 && ret != type) 1421 return -EBUSY; 1422 return 0; 1423 } 1424 1425 static bool use_gss_proxy(struct net *net) 1426 { 1427 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1428 1429 /* If use_gss_proxy is still undefined, then try to disable it */ 1430 if (sn->use_gss_proxy == -1) 1431 set_gss_proxy(net, 0); 1432 return sn->use_gss_proxy; 1433 } 1434 1435 static noinline_for_stack int 1436 svcauth_gss_proc_init(struct svc_rqst *rqstp, struct rpc_gss_wire_cred *gc) 1437 { 1438 struct kvec *argv = rqstp->rq_arg.head; 1439 1440 if (argv->iov_len < 2 * 4) 1441 return SVC_DENIED; 1442 if (svc_getnl(argv) != RPC_AUTH_NULL) 1443 return SVC_DENIED; 1444 if (svc_getnl(argv) != 0) 1445 return SVC_DENIED; 1446 1447 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) { 1448 rqstp->rq_auth_stat = rpc_autherr_badcred; 1449 return SVC_DENIED; 1450 } 1451 1452 if (!use_gss_proxy(SVC_NET(rqstp))) 1453 return svcauth_gss_legacy_init(rqstp, gc); 1454 return svcauth_gss_proxy_init(rqstp, gc); 1455 } 1456 1457 #ifdef CONFIG_PROC_FS 1458 1459 static ssize_t write_gssp(struct file *file, const char __user *buf, 1460 size_t count, loff_t *ppos) 1461 { 1462 struct net *net = pde_data(file_inode(file)); 1463 char tbuf[20]; 1464 unsigned long i; 1465 int res; 1466 1467 if (*ppos || count > sizeof(tbuf)-1) 1468 return -EINVAL; 1469 if (copy_from_user(tbuf, buf, count)) 1470 return -EFAULT; 1471 1472 tbuf[count] = 0; 1473 res = kstrtoul(tbuf, 0, &i); 1474 if (res) 1475 return res; 1476 if (i != 1) 1477 return -EINVAL; 1478 res = set_gssp_clnt(net); 1479 if (res) 1480 return res; 1481 res = set_gss_proxy(net, 1); 1482 if (res) 1483 return res; 1484 return count; 1485 } 1486 1487 static ssize_t read_gssp(struct file *file, char __user *buf, 1488 size_t count, loff_t *ppos) 1489 { 1490 struct net *net = pde_data(file_inode(file)); 1491 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1492 unsigned long p = *ppos; 1493 char tbuf[10]; 1494 size_t len; 1495 1496 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy); 1497 len = strlen(tbuf); 1498 if (p >= len) 1499 return 0; 1500 len -= p; 1501 if (len > count) 1502 len = count; 1503 if (copy_to_user(buf, (void *)(tbuf+p), len)) 1504 return -EFAULT; 1505 *ppos += len; 1506 return len; 1507 } 1508 1509 static const struct proc_ops use_gss_proxy_proc_ops = { 1510 .proc_open = nonseekable_open, 1511 .proc_write = write_gssp, 1512 .proc_read = read_gssp, 1513 }; 1514 1515 static int create_use_gss_proxy_proc_entry(struct net *net) 1516 { 1517 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1518 struct proc_dir_entry **p = &sn->use_gssp_proc; 1519 1520 sn->use_gss_proxy = -1; 1521 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600, 1522 sn->proc_net_rpc, 1523 &use_gss_proxy_proc_ops, net); 1524 if (!*p) 1525 return -ENOMEM; 1526 init_gssp_clnt(sn); 1527 return 0; 1528 } 1529 1530 static void destroy_use_gss_proxy_proc_entry(struct net *net) 1531 { 1532 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1533 1534 if (sn->use_gssp_proc) { 1535 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc); 1536 clear_gssp_clnt(sn); 1537 } 1538 } 1539 #else /* CONFIG_PROC_FS */ 1540 1541 static int create_use_gss_proxy_proc_entry(struct net *net) 1542 { 1543 return 0; 1544 } 1545 1546 static void destroy_use_gss_proxy_proc_entry(struct net *net) {} 1547 1548 #endif /* CONFIG_PROC_FS */ 1549 1550 /* 1551 * Accept an rpcsec packet. 1552 * If context establishment, punt to user space 1553 * If data exchange, verify/decrypt 1554 * If context destruction, handle here 1555 * In the context establishment and destruction case we encode 1556 * response here and return SVC_COMPLETE. 1557 */ 1558 static int 1559 svcauth_gss_accept(struct svc_rqst *rqstp) 1560 { 1561 struct kvec *argv = &rqstp->rq_arg.head[0]; 1562 struct kvec *resv = &rqstp->rq_res.head[0]; 1563 u32 crlen; 1564 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1565 struct rpc_gss_wire_cred *gc; 1566 struct rsc *rsci = NULL; 1567 __be32 *rpcstart; 1568 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1569 int ret; 1570 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1571 1572 rqstp->rq_auth_stat = rpc_autherr_badcred; 1573 if (!svcdata) 1574 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1575 if (!svcdata) 1576 goto auth_err; 1577 rqstp->rq_auth_data = svcdata; 1578 svcdata->verf_start = NULL; 1579 svcdata->rsci = NULL; 1580 gc = &svcdata->clcred; 1581 1582 /* start of rpc packet is 7 u32's back from here: 1583 * xid direction rpcversion prog vers proc flavour 1584 */ 1585 rpcstart = argv->iov_base; 1586 rpcstart -= 7; 1587 1588 /* credential is: 1589 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1590 * at least 5 u32s, and is preceded by length, so that makes 6. 1591 */ 1592 1593 if (argv->iov_len < 5 * 4) 1594 goto auth_err; 1595 crlen = svc_getnl(argv); 1596 if (svc_getnl(argv) != RPC_GSS_VERSION) 1597 goto auth_err; 1598 gc->gc_proc = svc_getnl(argv); 1599 gc->gc_seq = svc_getnl(argv); 1600 gc->gc_svc = svc_getnl(argv); 1601 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1602 goto auth_err; 1603 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1604 goto auth_err; 1605 1606 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1607 goto auth_err; 1608 1609 rqstp->rq_auth_stat = rpc_autherr_badverf; 1610 switch (gc->gc_proc) { 1611 case RPC_GSS_PROC_INIT: 1612 case RPC_GSS_PROC_CONTINUE_INIT: 1613 return svcauth_gss_proc_init(rqstp, gc); 1614 case RPC_GSS_PROC_DATA: 1615 case RPC_GSS_PROC_DESTROY: 1616 /* Look up the context, and check the verifier: */ 1617 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem; 1618 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 1619 if (!rsci) 1620 goto auth_err; 1621 switch (gss_verify_header(rqstp, rsci, rpcstart, gc)) { 1622 case SVC_OK: 1623 break; 1624 case SVC_DENIED: 1625 goto auth_err; 1626 case SVC_DROP: 1627 goto drop; 1628 } 1629 break; 1630 default: 1631 rqstp->rq_auth_stat = rpc_autherr_rejectedcred; 1632 goto auth_err; 1633 } 1634 1635 /* now act upon the command: */ 1636 switch (gc->gc_proc) { 1637 case RPC_GSS_PROC_DESTROY: 1638 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1639 goto auth_err; 1640 /* Delete the entry from the cache_list and call cache_put */ 1641 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h); 1642 if (resv->iov_len + 4 > PAGE_SIZE) 1643 goto drop; 1644 svc_putnl(resv, RPC_SUCCESS); 1645 goto complete; 1646 case RPC_GSS_PROC_DATA: 1647 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem; 1648 svcdata->verf_start = resv->iov_base + resv->iov_len; 1649 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1650 goto auth_err; 1651 rqstp->rq_cred = rsci->cred; 1652 get_group_info(rsci->cred.cr_group_info); 1653 rqstp->rq_auth_stat = rpc_autherr_badcred; 1654 switch (gc->gc_svc) { 1655 case RPC_GSS_SVC_NONE: 1656 svcxdr_init_decode(rqstp); 1657 break; 1658 case RPC_GSS_SVC_INTEGRITY: 1659 /* placeholders for length and seq. number: */ 1660 svc_putnl(resv, 0); 1661 svc_putnl(resv, 0); 1662 if (unwrap_integ_data(rqstp, &rqstp->rq_arg, 1663 gc->gc_seq, rsci->mechctx)) 1664 goto garbage_args; 1665 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE; 1666 svcxdr_init_decode(rqstp); 1667 break; 1668 case RPC_GSS_SVC_PRIVACY: 1669 /* placeholders for length and seq. number: */ 1670 svc_putnl(resv, 0); 1671 svc_putnl(resv, 0); 1672 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1673 gc->gc_seq, rsci->mechctx)) 1674 goto garbage_args; 1675 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2; 1676 svcxdr_init_decode(rqstp); 1677 break; 1678 default: 1679 goto auth_err; 1680 } 1681 svcdata->rsci = rsci; 1682 cache_get(&rsci->h); 1683 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( 1684 rsci->mechctx->mech_type, 1685 GSS_C_QOP_DEFAULT, 1686 gc->gc_svc); 1687 ret = SVC_OK; 1688 trace_rpcgss_svc_authenticate(rqstp, gc); 1689 goto out; 1690 } 1691 garbage_args: 1692 ret = SVC_GARBAGE; 1693 goto out; 1694 auth_err: 1695 /* Restore write pointer to its original value: */ 1696 xdr_ressize_check(rqstp, reject_stat); 1697 ret = SVC_DENIED; 1698 goto out; 1699 complete: 1700 ret = SVC_COMPLETE; 1701 goto out; 1702 drop: 1703 ret = SVC_CLOSE; 1704 out: 1705 if (rsci) 1706 cache_put(&rsci->h, sn->rsc_cache); 1707 return ret; 1708 } 1709 1710 static __be32 * 1711 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1712 { 1713 __be32 *p; 1714 u32 verf_len; 1715 1716 p = gsd->verf_start; 1717 gsd->verf_start = NULL; 1718 1719 /* If the reply stat is nonzero, don't wrap: */ 1720 if (*(p-1) != rpc_success) 1721 return NULL; 1722 /* Skip the verifier: */ 1723 p += 1; 1724 verf_len = ntohl(*p++); 1725 p += XDR_QUADLEN(verf_len); 1726 /* move accept_stat to right place: */ 1727 memcpy(p, p + 2, 4); 1728 /* Also don't wrap if the accept stat is nonzero: */ 1729 if (*p != rpc_success) { 1730 resbuf->head[0].iov_len -= 2 * 4; 1731 return NULL; 1732 } 1733 p++; 1734 return p; 1735 } 1736 1737 static inline int 1738 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1739 { 1740 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1741 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1742 struct xdr_buf *resbuf = &rqstp->rq_res; 1743 struct xdr_buf integ_buf; 1744 struct xdr_netobj mic; 1745 struct kvec *resv; 1746 __be32 *p; 1747 int integ_offset, integ_len; 1748 int stat = -EINVAL; 1749 1750 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1751 if (p == NULL) 1752 goto out; 1753 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1754 integ_len = resbuf->len - integ_offset; 1755 if (integ_len & 3) 1756 goto out; 1757 *p++ = htonl(integ_len); 1758 *p++ = htonl(gc->gc_seq); 1759 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) { 1760 WARN_ON_ONCE(1); 1761 goto out_err; 1762 } 1763 if (resbuf->tail[0].iov_base == NULL) { 1764 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1765 goto out_err; 1766 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1767 + resbuf->head[0].iov_len; 1768 resbuf->tail[0].iov_len = 0; 1769 } 1770 resv = &resbuf->tail[0]; 1771 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1772 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1773 goto out_err; 1774 svc_putnl(resv, mic.len); 1775 memset(mic.data + mic.len, 0, 1776 round_up_to_quad(mic.len) - mic.len); 1777 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1778 /* not strictly required: */ 1779 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1780 if (resv->iov_len > PAGE_SIZE) 1781 goto out_err; 1782 out: 1783 stat = 0; 1784 out_err: 1785 return stat; 1786 } 1787 1788 static inline int 1789 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1790 { 1791 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1792 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1793 struct xdr_buf *resbuf = &rqstp->rq_res; 1794 struct page **inpages = NULL; 1795 __be32 *p, *len; 1796 int offset; 1797 int pad; 1798 1799 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1800 if (p == NULL) 1801 return 0; 1802 len = p++; 1803 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1804 *p++ = htonl(gc->gc_seq); 1805 inpages = resbuf->pages; 1806 /* XXX: Would be better to write some xdr helper functions for 1807 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1808 1809 /* 1810 * If there is currently tail data, make sure there is 1811 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1812 * the page, and move the current tail data such that 1813 * there is RPC_MAX_AUTH_SIZE slack space available in 1814 * both the head and tail. 1815 */ 1816 if (resbuf->tail[0].iov_base) { 1817 if (resbuf->tail[0].iov_base >= 1818 resbuf->head[0].iov_base + PAGE_SIZE) 1819 return -EINVAL; 1820 if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base) 1821 return -EINVAL; 1822 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1823 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1824 return -ENOMEM; 1825 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1826 resbuf->tail[0].iov_base, 1827 resbuf->tail[0].iov_len); 1828 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1829 } 1830 /* 1831 * If there is no current tail data, make sure there is 1832 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1833 * allotted page, and set up tail information such that there 1834 * is RPC_MAX_AUTH_SIZE slack space available in both the 1835 * head and tail. 1836 */ 1837 if (resbuf->tail[0].iov_base == NULL) { 1838 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1839 return -ENOMEM; 1840 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1841 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1842 resbuf->tail[0].iov_len = 0; 1843 } 1844 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1845 return -ENOMEM; 1846 *len = htonl(resbuf->len - offset); 1847 pad = 3 - ((resbuf->len - offset - 1)&3); 1848 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1849 memset(p, 0, pad); 1850 resbuf->tail[0].iov_len += pad; 1851 resbuf->len += pad; 1852 return 0; 1853 } 1854 1855 static int 1856 svcauth_gss_release(struct svc_rqst *rqstp) 1857 { 1858 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1859 struct rpc_gss_wire_cred *gc; 1860 struct xdr_buf *resbuf = &rqstp->rq_res; 1861 int stat = -EINVAL; 1862 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); 1863 1864 if (!gsd) 1865 goto out; 1866 gc = &gsd->clcred; 1867 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1868 goto out; 1869 /* Release can be called twice, but we only wrap once. */ 1870 if (gsd->verf_start == NULL) 1871 goto out; 1872 /* normally not set till svc_send, but we need it here: */ 1873 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1874 * or whatever? */ 1875 resbuf->len = total_buf_len(resbuf); 1876 switch (gc->gc_svc) { 1877 case RPC_GSS_SVC_NONE: 1878 break; 1879 case RPC_GSS_SVC_INTEGRITY: 1880 stat = svcauth_gss_wrap_resp_integ(rqstp); 1881 if (stat) 1882 goto out_err; 1883 break; 1884 case RPC_GSS_SVC_PRIVACY: 1885 stat = svcauth_gss_wrap_resp_priv(rqstp); 1886 if (stat) 1887 goto out_err; 1888 break; 1889 /* 1890 * For any other gc_svc value, svcauth_gss_accept() already set 1891 * the auth_error appropriately; just fall through: 1892 */ 1893 } 1894 1895 out: 1896 stat = 0; 1897 out_err: 1898 if (rqstp->rq_client) 1899 auth_domain_put(rqstp->rq_client); 1900 rqstp->rq_client = NULL; 1901 if (rqstp->rq_gssclient) 1902 auth_domain_put(rqstp->rq_gssclient); 1903 rqstp->rq_gssclient = NULL; 1904 if (rqstp->rq_cred.cr_group_info) 1905 put_group_info(rqstp->rq_cred.cr_group_info); 1906 rqstp->rq_cred.cr_group_info = NULL; 1907 if (gsd && gsd->rsci) { 1908 cache_put(&gsd->rsci->h, sn->rsc_cache); 1909 gsd->rsci = NULL; 1910 } 1911 return stat; 1912 } 1913 1914 static void 1915 svcauth_gss_domain_release_rcu(struct rcu_head *head) 1916 { 1917 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head); 1918 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1919 1920 kfree(dom->name); 1921 kfree(gd); 1922 } 1923 1924 static void 1925 svcauth_gss_domain_release(struct auth_domain *dom) 1926 { 1927 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu); 1928 } 1929 1930 static struct auth_ops svcauthops_gss = { 1931 .name = "rpcsec_gss", 1932 .owner = THIS_MODULE, 1933 .flavour = RPC_AUTH_GSS, 1934 .accept = svcauth_gss_accept, 1935 .release = svcauth_gss_release, 1936 .domain_release = svcauth_gss_domain_release, 1937 .set_client = svcauth_gss_set_client, 1938 }; 1939 1940 static int rsi_cache_create_net(struct net *net) 1941 { 1942 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1943 struct cache_detail *cd; 1944 int err; 1945 1946 cd = cache_create_net(&rsi_cache_template, net); 1947 if (IS_ERR(cd)) 1948 return PTR_ERR(cd); 1949 err = cache_register_net(cd, net); 1950 if (err) { 1951 cache_destroy_net(cd, net); 1952 return err; 1953 } 1954 sn->rsi_cache = cd; 1955 return 0; 1956 } 1957 1958 static void rsi_cache_destroy_net(struct net *net) 1959 { 1960 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1961 struct cache_detail *cd = sn->rsi_cache; 1962 1963 sn->rsi_cache = NULL; 1964 cache_purge(cd); 1965 cache_unregister_net(cd, net); 1966 cache_destroy_net(cd, net); 1967 } 1968 1969 static int rsc_cache_create_net(struct net *net) 1970 { 1971 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1972 struct cache_detail *cd; 1973 int err; 1974 1975 cd = cache_create_net(&rsc_cache_template, net); 1976 if (IS_ERR(cd)) 1977 return PTR_ERR(cd); 1978 err = cache_register_net(cd, net); 1979 if (err) { 1980 cache_destroy_net(cd, net); 1981 return err; 1982 } 1983 sn->rsc_cache = cd; 1984 return 0; 1985 } 1986 1987 static void rsc_cache_destroy_net(struct net *net) 1988 { 1989 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1990 struct cache_detail *cd = sn->rsc_cache; 1991 1992 sn->rsc_cache = NULL; 1993 cache_purge(cd); 1994 cache_unregister_net(cd, net); 1995 cache_destroy_net(cd, net); 1996 } 1997 1998 int 1999 gss_svc_init_net(struct net *net) 2000 { 2001 int rv; 2002 2003 rv = rsc_cache_create_net(net); 2004 if (rv) 2005 return rv; 2006 rv = rsi_cache_create_net(net); 2007 if (rv) 2008 goto out1; 2009 rv = create_use_gss_proxy_proc_entry(net); 2010 if (rv) 2011 goto out2; 2012 return 0; 2013 out2: 2014 rsi_cache_destroy_net(net); 2015 out1: 2016 rsc_cache_destroy_net(net); 2017 return rv; 2018 } 2019 2020 void 2021 gss_svc_shutdown_net(struct net *net) 2022 { 2023 destroy_use_gss_proxy_proc_entry(net); 2024 rsi_cache_destroy_net(net); 2025 rsc_cache_destroy_net(net); 2026 } 2027 2028 int 2029 gss_svc_init(void) 2030 { 2031 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 2032 } 2033 2034 void 2035 gss_svc_shutdown(void) 2036 { 2037 svc_auth_unregister(RPC_AUTH_GSS); 2038 } 2039