1 /* 2 * Neil Brown <neilb@cse.unsw.edu.au> 3 * J. Bruce Fields <bfields@umich.edu> 4 * Andy Adamson <andros@umich.edu> 5 * Dug Song <dugsong@monkey.org> 6 * 7 * RPCSEC_GSS server authentication. 8 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078 9 * (gssapi) 10 * 11 * The RPCSEC_GSS involves three stages: 12 * 1/ context creation 13 * 2/ data exchange 14 * 3/ context destruction 15 * 16 * Context creation is handled largely by upcalls to user-space. 17 * In particular, GSS_Accept_sec_context is handled by an upcall 18 * Data exchange is handled entirely within the kernel 19 * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel. 20 * Context destruction is handled in-kernel 21 * GSS_Delete_sec_context is in-kernel 22 * 23 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving. 24 * The context handle and gss_token are used as a key into the rpcsec_init cache. 25 * The content of this cache includes some of the outputs of GSS_Accept_sec_context, 26 * being major_status, minor_status, context_handle, reply_token. 27 * These are sent back to the client. 28 * Sequence window management is handled by the kernel. The window size if currently 29 * a compile time constant. 30 * 31 * When user-space is happy that a context is established, it places an entry 32 * in the rpcsec_context cache. The key for this cache is the context_handle. 33 * The content includes: 34 * uid/gidlist - for determining access rights 35 * mechanism type 36 * mechanism specific information, such as a key 37 * 38 */ 39 40 #include <linux/types.h> 41 #include <linux/module.h> 42 #include <linux/pagemap.h> 43 44 #include <linux/sunrpc/auth_gss.h> 45 #include <linux/sunrpc/gss_err.h> 46 #include <linux/sunrpc/svcauth.h> 47 #include <linux/sunrpc/svcauth_gss.h> 48 #include <linux/sunrpc/cache.h> 49 50 #ifdef RPC_DEBUG 51 # define RPCDBG_FACILITY RPCDBG_AUTH 52 #endif 53 54 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests 55 * into replies. 56 * 57 * Key is context handle (\x if empty) and gss_token. 58 * Content is major_status minor_status (integers) context_handle, reply_token. 59 * 60 */ 61 62 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) 63 { 64 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); 65 } 66 67 #define RSI_HASHBITS 6 68 #define RSI_HASHMAX (1<<RSI_HASHBITS) 69 #define RSI_HASHMASK (RSI_HASHMAX-1) 70 71 struct rsi { 72 struct cache_head h; 73 struct xdr_netobj in_handle, in_token; 74 struct xdr_netobj out_handle, out_token; 75 int major_status, minor_status; 76 }; 77 78 static struct cache_head *rsi_table[RSI_HASHMAX]; 79 static struct cache_detail rsi_cache; 80 static struct rsi *rsi_update(struct rsi *new, struct rsi *old); 81 static struct rsi *rsi_lookup(struct rsi *item); 82 83 static void rsi_free(struct rsi *rsii) 84 { 85 kfree(rsii->in_handle.data); 86 kfree(rsii->in_token.data); 87 kfree(rsii->out_handle.data); 88 kfree(rsii->out_token.data); 89 } 90 91 static void rsi_put(struct kref *ref) 92 { 93 struct rsi *rsii = container_of(ref, struct rsi, h.ref); 94 rsi_free(rsii); 95 kfree(rsii); 96 } 97 98 static inline int rsi_hash(struct rsi *item) 99 { 100 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS) 101 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS); 102 } 103 104 static int rsi_match(struct cache_head *a, struct cache_head *b) 105 { 106 struct rsi *item = container_of(a, struct rsi, h); 107 struct rsi *tmp = container_of(b, struct rsi, h); 108 return netobj_equal(&item->in_handle, &tmp->in_handle) 109 && netobj_equal(&item->in_token, &tmp->in_token); 110 } 111 112 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len) 113 { 114 dst->len = len; 115 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL); 116 if (len && !dst->data) 117 return -ENOMEM; 118 return 0; 119 } 120 121 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src) 122 { 123 return dup_to_netobj(dst, src->data, src->len); 124 } 125 126 static void rsi_init(struct cache_head *cnew, struct cache_head *citem) 127 { 128 struct rsi *new = container_of(cnew, struct rsi, h); 129 struct rsi *item = container_of(citem, struct rsi, h); 130 131 new->out_handle.data = NULL; 132 new->out_handle.len = 0; 133 new->out_token.data = NULL; 134 new->out_token.len = 0; 135 new->in_handle.len = item->in_handle.len; 136 item->in_handle.len = 0; 137 new->in_token.len = item->in_token.len; 138 item->in_token.len = 0; 139 new->in_handle.data = item->in_handle.data; 140 item->in_handle.data = NULL; 141 new->in_token.data = item->in_token.data; 142 item->in_token.data = NULL; 143 } 144 145 static void update_rsi(struct cache_head *cnew, struct cache_head *citem) 146 { 147 struct rsi *new = container_of(cnew, struct rsi, h); 148 struct rsi *item = container_of(citem, struct rsi, h); 149 150 BUG_ON(new->out_handle.data || new->out_token.data); 151 new->out_handle.len = item->out_handle.len; 152 item->out_handle.len = 0; 153 new->out_token.len = item->out_token.len; 154 item->out_token.len = 0; 155 new->out_handle.data = item->out_handle.data; 156 item->out_handle.data = NULL; 157 new->out_token.data = item->out_token.data; 158 item->out_token.data = NULL; 159 160 new->major_status = item->major_status; 161 new->minor_status = item->minor_status; 162 } 163 164 static struct cache_head *rsi_alloc(void) 165 { 166 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL); 167 if (rsii) 168 return &rsii->h; 169 else 170 return NULL; 171 } 172 173 static void rsi_request(struct cache_detail *cd, 174 struct cache_head *h, 175 char **bpp, int *blen) 176 { 177 struct rsi *rsii = container_of(h, struct rsi, h); 178 179 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len); 180 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len); 181 (*bpp)[-1] = '\n'; 182 } 183 184 185 static int rsi_parse(struct cache_detail *cd, 186 char *mesg, int mlen) 187 { 188 /* context token expiry major minor context token */ 189 char *buf = mesg; 190 char *ep; 191 int len; 192 struct rsi rsii, *rsip = NULL; 193 time_t expiry; 194 int status = -EINVAL; 195 196 memset(&rsii, 0, sizeof(rsii)); 197 /* handle */ 198 len = qword_get(&mesg, buf, mlen); 199 if (len < 0) 200 goto out; 201 status = -ENOMEM; 202 if (dup_to_netobj(&rsii.in_handle, buf, len)) 203 goto out; 204 205 /* token */ 206 len = qword_get(&mesg, buf, mlen); 207 status = -EINVAL; 208 if (len < 0) 209 goto out; 210 status = -ENOMEM; 211 if (dup_to_netobj(&rsii.in_token, buf, len)) 212 goto out; 213 214 rsip = rsi_lookup(&rsii); 215 if (!rsip) 216 goto out; 217 218 rsii.h.flags = 0; 219 /* expiry */ 220 expiry = get_expiry(&mesg); 221 status = -EINVAL; 222 if (expiry == 0) 223 goto out; 224 225 /* major/minor */ 226 len = qword_get(&mesg, buf, mlen); 227 if (len < 0) 228 goto out; 229 if (len == 0) { 230 goto out; 231 } else { 232 rsii.major_status = simple_strtoul(buf, &ep, 10); 233 if (*ep) 234 goto out; 235 len = qword_get(&mesg, buf, mlen); 236 if (len <= 0) 237 goto out; 238 rsii.minor_status = simple_strtoul(buf, &ep, 10); 239 if (*ep) 240 goto out; 241 242 /* out_handle */ 243 len = qword_get(&mesg, buf, mlen); 244 if (len < 0) 245 goto out; 246 status = -ENOMEM; 247 if (dup_to_netobj(&rsii.out_handle, buf, len)) 248 goto out; 249 250 /* out_token */ 251 len = qword_get(&mesg, buf, mlen); 252 status = -EINVAL; 253 if (len < 0) 254 goto out; 255 status = -ENOMEM; 256 if (dup_to_netobj(&rsii.out_token, buf, len)) 257 goto out; 258 } 259 rsii.h.expiry_time = expiry; 260 rsip = rsi_update(&rsii, rsip); 261 status = 0; 262 out: 263 rsi_free(&rsii); 264 if (rsip) 265 cache_put(&rsip->h, &rsi_cache); 266 else 267 status = -ENOMEM; 268 return status; 269 } 270 271 static struct cache_detail rsi_cache = { 272 .owner = THIS_MODULE, 273 .hash_size = RSI_HASHMAX, 274 .hash_table = rsi_table, 275 .name = "auth.rpcsec.init", 276 .cache_put = rsi_put, 277 .cache_request = rsi_request, 278 .cache_parse = rsi_parse, 279 .match = rsi_match, 280 .init = rsi_init, 281 .update = update_rsi, 282 .alloc = rsi_alloc, 283 }; 284 285 static struct rsi *rsi_lookup(struct rsi *item) 286 { 287 struct cache_head *ch; 288 int hash = rsi_hash(item); 289 290 ch = sunrpc_cache_lookup(&rsi_cache, &item->h, hash); 291 if (ch) 292 return container_of(ch, struct rsi, h); 293 else 294 return NULL; 295 } 296 297 static struct rsi *rsi_update(struct rsi *new, struct rsi *old) 298 { 299 struct cache_head *ch; 300 int hash = rsi_hash(new); 301 302 ch = sunrpc_cache_update(&rsi_cache, &new->h, 303 &old->h, hash); 304 if (ch) 305 return container_of(ch, struct rsi, h); 306 else 307 return NULL; 308 } 309 310 311 /* 312 * The rpcsec_context cache is used to store a context that is 313 * used in data exchange. 314 * The key is a context handle. The content is: 315 * uid, gidlist, mechanism, service-set, mech-specific-data 316 */ 317 318 #define RSC_HASHBITS 10 319 #define RSC_HASHMAX (1<<RSC_HASHBITS) 320 #define RSC_HASHMASK (RSC_HASHMAX-1) 321 322 #define GSS_SEQ_WIN 128 323 324 struct gss_svc_seq_data { 325 /* highest seq number seen so far: */ 326 int sd_max; 327 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 328 * sd_win is nonzero iff sequence number i has been seen already: */ 329 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 330 spinlock_t sd_lock; 331 }; 332 333 struct rsc { 334 struct cache_head h; 335 struct xdr_netobj handle; 336 struct svc_cred cred; 337 struct gss_svc_seq_data seqdata; 338 struct gss_ctx *mechctx; 339 }; 340 341 static struct cache_head *rsc_table[RSC_HASHMAX]; 342 static struct cache_detail rsc_cache; 343 static struct rsc *rsc_update(struct rsc *new, struct rsc *old); 344 static struct rsc *rsc_lookup(struct rsc *item); 345 346 static void rsc_free(struct rsc *rsci) 347 { 348 kfree(rsci->handle.data); 349 if (rsci->mechctx) 350 gss_delete_sec_context(&rsci->mechctx); 351 if (rsci->cred.cr_group_info) 352 put_group_info(rsci->cred.cr_group_info); 353 } 354 355 static void rsc_put(struct kref *ref) 356 { 357 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 358 359 rsc_free(rsci); 360 kfree(rsci); 361 } 362 363 static inline int 364 rsc_hash(struct rsc *rsci) 365 { 366 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 367 } 368 369 static int 370 rsc_match(struct cache_head *a, struct cache_head *b) 371 { 372 struct rsc *new = container_of(a, struct rsc, h); 373 struct rsc *tmp = container_of(b, struct rsc, h); 374 375 return netobj_equal(&new->handle, &tmp->handle); 376 } 377 378 static void 379 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 380 { 381 struct rsc *new = container_of(cnew, struct rsc, h); 382 struct rsc *tmp = container_of(ctmp, struct rsc, h); 383 384 new->handle.len = tmp->handle.len; 385 tmp->handle.len = 0; 386 new->handle.data = tmp->handle.data; 387 tmp->handle.data = NULL; 388 new->mechctx = NULL; 389 new->cred.cr_group_info = NULL; 390 } 391 392 static void 393 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 394 { 395 struct rsc *new = container_of(cnew, struct rsc, h); 396 struct rsc *tmp = container_of(ctmp, struct rsc, h); 397 398 new->mechctx = tmp->mechctx; 399 tmp->mechctx = NULL; 400 memset(&new->seqdata, 0, sizeof(new->seqdata)); 401 spin_lock_init(&new->seqdata.sd_lock); 402 new->cred = tmp->cred; 403 tmp->cred.cr_group_info = NULL; 404 } 405 406 static struct cache_head * 407 rsc_alloc(void) 408 { 409 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 410 if (rsci) 411 return &rsci->h; 412 else 413 return NULL; 414 } 415 416 static int rsc_parse(struct cache_detail *cd, 417 char *mesg, int mlen) 418 { 419 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 420 char *buf = mesg; 421 int len, rv; 422 struct rsc rsci, *rscp = NULL; 423 time_t expiry; 424 int status = -EINVAL; 425 struct gss_api_mech *gm = NULL; 426 427 memset(&rsci, 0, sizeof(rsci)); 428 /* context handle */ 429 len = qword_get(&mesg, buf, mlen); 430 if (len < 0) goto out; 431 status = -ENOMEM; 432 if (dup_to_netobj(&rsci.handle, buf, len)) 433 goto out; 434 435 rsci.h.flags = 0; 436 /* expiry */ 437 expiry = get_expiry(&mesg); 438 status = -EINVAL; 439 if (expiry == 0) 440 goto out; 441 442 rscp = rsc_lookup(&rsci); 443 if (!rscp) 444 goto out; 445 446 /* uid, or NEGATIVE */ 447 rv = get_int(&mesg, &rsci.cred.cr_uid); 448 if (rv == -EINVAL) 449 goto out; 450 if (rv == -ENOENT) 451 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 452 else { 453 int N, i; 454 455 /* gid */ 456 if (get_int(&mesg, &rsci.cred.cr_gid)) 457 goto out; 458 459 /* number of additional gid's */ 460 if (get_int(&mesg, &N)) 461 goto out; 462 status = -ENOMEM; 463 rsci.cred.cr_group_info = groups_alloc(N); 464 if (rsci.cred.cr_group_info == NULL) 465 goto out; 466 467 /* gid's */ 468 status = -EINVAL; 469 for (i=0; i<N; i++) { 470 gid_t gid; 471 if (get_int(&mesg, &gid)) 472 goto out; 473 GROUP_AT(rsci.cred.cr_group_info, i) = gid; 474 } 475 476 /* mech name */ 477 len = qword_get(&mesg, buf, mlen); 478 if (len < 0) 479 goto out; 480 gm = gss_mech_get_by_name(buf); 481 status = -EOPNOTSUPP; 482 if (!gm) 483 goto out; 484 485 status = -EINVAL; 486 /* mech-specific data: */ 487 len = qword_get(&mesg, buf, mlen); 488 if (len < 0) 489 goto out; 490 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx); 491 if (status) 492 goto out; 493 } 494 rsci.h.expiry_time = expiry; 495 rscp = rsc_update(&rsci, rscp); 496 status = 0; 497 out: 498 gss_mech_put(gm); 499 rsc_free(&rsci); 500 if (rscp) 501 cache_put(&rscp->h, &rsc_cache); 502 else 503 status = -ENOMEM; 504 return status; 505 } 506 507 static struct cache_detail rsc_cache = { 508 .owner = THIS_MODULE, 509 .hash_size = RSC_HASHMAX, 510 .hash_table = rsc_table, 511 .name = "auth.rpcsec.context", 512 .cache_put = rsc_put, 513 .cache_parse = rsc_parse, 514 .match = rsc_match, 515 .init = rsc_init, 516 .update = update_rsc, 517 .alloc = rsc_alloc, 518 }; 519 520 static struct rsc *rsc_lookup(struct rsc *item) 521 { 522 struct cache_head *ch; 523 int hash = rsc_hash(item); 524 525 ch = sunrpc_cache_lookup(&rsc_cache, &item->h, hash); 526 if (ch) 527 return container_of(ch, struct rsc, h); 528 else 529 return NULL; 530 } 531 532 static struct rsc *rsc_update(struct rsc *new, struct rsc *old) 533 { 534 struct cache_head *ch; 535 int hash = rsc_hash(new); 536 537 ch = sunrpc_cache_update(&rsc_cache, &new->h, 538 &old->h, hash); 539 if (ch) 540 return container_of(ch, struct rsc, h); 541 else 542 return NULL; 543 } 544 545 546 static struct rsc * 547 gss_svc_searchbyctx(struct xdr_netobj *handle) 548 { 549 struct rsc rsci; 550 struct rsc *found; 551 552 memset(&rsci, 0, sizeof(rsci)); 553 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 554 return NULL; 555 found = rsc_lookup(&rsci); 556 rsc_free(&rsci); 557 if (!found) 558 return NULL; 559 if (cache_check(&rsc_cache, &found->h, NULL)) 560 return NULL; 561 return found; 562 } 563 564 /* Implements sequence number algorithm as specified in RFC 2203. */ 565 static int 566 gss_check_seq_num(struct rsc *rsci, int seq_num) 567 { 568 struct gss_svc_seq_data *sd = &rsci->seqdata; 569 570 spin_lock(&sd->sd_lock); 571 if (seq_num > sd->sd_max) { 572 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 573 memset(sd->sd_win,0,sizeof(sd->sd_win)); 574 sd->sd_max = seq_num; 575 } else while (sd->sd_max < seq_num) { 576 sd->sd_max++; 577 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 578 } 579 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 580 goto ok; 581 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 582 goto drop; 583 } 584 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 585 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 586 goto drop; 587 ok: 588 spin_unlock(&sd->sd_lock); 589 return 1; 590 drop: 591 spin_unlock(&sd->sd_lock); 592 return 0; 593 } 594 595 static inline u32 round_up_to_quad(u32 i) 596 { 597 return (i + 3 ) & ~3; 598 } 599 600 static inline int 601 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 602 { 603 int l; 604 605 if (argv->iov_len < 4) 606 return -1; 607 o->len = svc_getnl(argv); 608 l = round_up_to_quad(o->len); 609 if (argv->iov_len < l) 610 return -1; 611 o->data = argv->iov_base; 612 argv->iov_base += l; 613 argv->iov_len -= l; 614 return 0; 615 } 616 617 static inline int 618 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 619 { 620 u8 *p; 621 622 if (resv->iov_len + 4 > PAGE_SIZE) 623 return -1; 624 svc_putnl(resv, o->len); 625 p = resv->iov_base + resv->iov_len; 626 resv->iov_len += round_up_to_quad(o->len); 627 if (resv->iov_len > PAGE_SIZE) 628 return -1; 629 memcpy(p, o->data, o->len); 630 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 631 return 0; 632 } 633 634 /* Verify the checksum on the header and return SVC_OK on success. 635 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 636 * or return SVC_DENIED and indicate error in authp. 637 */ 638 static int 639 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 640 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 641 { 642 struct gss_ctx *ctx_id = rsci->mechctx; 643 struct xdr_buf rpchdr; 644 struct xdr_netobj checksum; 645 u32 flavor = 0; 646 struct kvec *argv = &rqstp->rq_arg.head[0]; 647 struct kvec iov; 648 649 /* data to compute the checksum over: */ 650 iov.iov_base = rpcstart; 651 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 652 xdr_buf_from_iov(&iov, &rpchdr); 653 654 *authp = rpc_autherr_badverf; 655 if (argv->iov_len < 4) 656 return SVC_DENIED; 657 flavor = svc_getnl(argv); 658 if (flavor != RPC_AUTH_GSS) 659 return SVC_DENIED; 660 if (svc_safe_getnetobj(argv, &checksum)) 661 return SVC_DENIED; 662 663 if (rqstp->rq_deferred) /* skip verification of revisited request */ 664 return SVC_OK; 665 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 666 *authp = rpcsec_gsserr_credproblem; 667 return SVC_DENIED; 668 } 669 670 if (gc->gc_seq > MAXSEQ) { 671 dprintk("RPC: svcauth_gss: discarding request with " 672 "large sequence number %d\n", gc->gc_seq); 673 *authp = rpcsec_gsserr_ctxproblem; 674 return SVC_DENIED; 675 } 676 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 677 dprintk("RPC: svcauth_gss: discarding request with " 678 "old sequence number %d\n", gc->gc_seq); 679 return SVC_DROP; 680 } 681 return SVC_OK; 682 } 683 684 static int 685 gss_write_null_verf(struct svc_rqst *rqstp) 686 { 687 __be32 *p; 688 689 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 690 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 691 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 692 *p++ = 0; 693 if (!xdr_ressize_check(rqstp, p)) 694 return -1; 695 return 0; 696 } 697 698 static int 699 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 700 { 701 __be32 xdr_seq; 702 u32 maj_stat; 703 struct xdr_buf verf_data; 704 struct xdr_netobj mic; 705 __be32 *p; 706 struct kvec iov; 707 708 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 709 xdr_seq = htonl(seq); 710 711 iov.iov_base = &xdr_seq; 712 iov.iov_len = sizeof(xdr_seq); 713 xdr_buf_from_iov(&iov, &verf_data); 714 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 715 mic.data = (u8 *)(p + 1); 716 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 717 if (maj_stat != GSS_S_COMPLETE) 718 return -1; 719 *p++ = htonl(mic.len); 720 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 721 p += XDR_QUADLEN(mic.len); 722 if (!xdr_ressize_check(rqstp, p)) 723 return -1; 724 return 0; 725 } 726 727 struct gss_domain { 728 struct auth_domain h; 729 u32 pseudoflavor; 730 }; 731 732 static struct auth_domain * 733 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 734 { 735 char *name; 736 737 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 738 if (!name) 739 return NULL; 740 return auth_domain_find(name); 741 } 742 743 static struct auth_ops svcauthops_gss; 744 745 u32 svcauth_gss_flavor(struct auth_domain *dom) 746 { 747 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 748 749 return gd->pseudoflavor; 750 } 751 752 EXPORT_SYMBOL(svcauth_gss_flavor); 753 754 int 755 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 756 { 757 struct gss_domain *new; 758 struct auth_domain *test; 759 int stat = -ENOMEM; 760 761 new = kmalloc(sizeof(*new), GFP_KERNEL); 762 if (!new) 763 goto out; 764 kref_init(&new->h.ref); 765 new->h.name = kstrdup(name, GFP_KERNEL); 766 if (!new->h.name) 767 goto out_free_dom; 768 new->h.flavour = &svcauthops_gss; 769 new->pseudoflavor = pseudoflavor; 770 771 stat = 0; 772 test = auth_domain_lookup(name, &new->h); 773 if (test != &new->h) { /* Duplicate registration */ 774 auth_domain_put(test); 775 kfree(new->h.name); 776 goto out_free_dom; 777 } 778 return 0; 779 780 out_free_dom: 781 kfree(new); 782 out: 783 return stat; 784 } 785 786 EXPORT_SYMBOL(svcauth_gss_register_pseudoflavor); 787 788 static inline int 789 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 790 { 791 __be32 raw; 792 int status; 793 794 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 795 if (status) 796 return status; 797 *obj = ntohl(raw); 798 return 0; 799 } 800 801 /* It would be nice if this bit of code could be shared with the client. 802 * Obstacles: 803 * The client shouldn't malloc(), would have to pass in own memory. 804 * The server uses base of head iovec as read pointer, while the 805 * client uses separate pointer. */ 806 static int 807 unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 808 { 809 int stat = -EINVAL; 810 u32 integ_len, maj_stat; 811 struct xdr_netobj mic; 812 struct xdr_buf integ_buf; 813 814 integ_len = svc_getnl(&buf->head[0]); 815 if (integ_len & 3) 816 return stat; 817 if (integ_len > buf->len) 818 return stat; 819 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 820 BUG(); 821 /* copy out mic... */ 822 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 823 BUG(); 824 if (mic.len > RPC_MAX_AUTH_SIZE) 825 return stat; 826 mic.data = kmalloc(mic.len, GFP_KERNEL); 827 if (!mic.data) 828 return stat; 829 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 830 goto out; 831 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 832 if (maj_stat != GSS_S_COMPLETE) 833 goto out; 834 if (svc_getnl(&buf->head[0]) != seq) 835 goto out; 836 stat = 0; 837 out: 838 kfree(mic.data); 839 return stat; 840 } 841 842 static inline int 843 total_buf_len(struct xdr_buf *buf) 844 { 845 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 846 } 847 848 static void 849 fix_priv_head(struct xdr_buf *buf, int pad) 850 { 851 if (buf->page_len == 0) { 852 /* We need to adjust head and buf->len in tandem in this 853 * case to make svc_defer() work--it finds the original 854 * buffer start using buf->len - buf->head[0].iov_len. */ 855 buf->head[0].iov_len -= pad; 856 } 857 } 858 859 static int 860 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 861 { 862 u32 priv_len, maj_stat; 863 int pad, saved_len, remaining_len, offset; 864 865 rqstp->rq_splice_ok = 0; 866 867 priv_len = svc_getnl(&buf->head[0]); 868 if (rqstp->rq_deferred) { 869 /* Already decrypted last time through! The sequence number 870 * check at out_seq is unnecessary but harmless: */ 871 goto out_seq; 872 } 873 /* buf->len is the number of bytes from the original start of the 874 * request to the end, where head[0].iov_len is just the bytes 875 * not yet read from the head, so these two values are different: */ 876 remaining_len = total_buf_len(buf); 877 if (priv_len > remaining_len) 878 return -EINVAL; 879 pad = remaining_len - priv_len; 880 buf->len -= pad; 881 fix_priv_head(buf, pad); 882 883 /* Maybe it would be better to give gss_unwrap a length parameter: */ 884 saved_len = buf->len; 885 buf->len = priv_len; 886 maj_stat = gss_unwrap(ctx, 0, buf); 887 pad = priv_len - buf->len; 888 buf->len = saved_len; 889 buf->len -= pad; 890 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 891 * In the krb5p case, at least, the data ends up offset, so we need to 892 * move it around. */ 893 /* XXX: This is very inefficient. It would be better to either do 894 * this while we encrypt, or maybe in the receive code, if we can peak 895 * ahead and work out the service and mechanism there. */ 896 offset = buf->head[0].iov_len % 4; 897 if (offset) { 898 buf->buflen = RPCSVC_MAXPAYLOAD; 899 xdr_shift_buf(buf, offset); 900 fix_priv_head(buf, pad); 901 } 902 if (maj_stat != GSS_S_COMPLETE) 903 return -EINVAL; 904 out_seq: 905 if (svc_getnl(&buf->head[0]) != seq) 906 return -EINVAL; 907 return 0; 908 } 909 910 struct gss_svc_data { 911 /* decoded gss client cred: */ 912 struct rpc_gss_wire_cred clcred; 913 /* save a pointer to the beginning of the encoded verifier, 914 * for use in encryption/checksumming in svcauth_gss_release: */ 915 __be32 *verf_start; 916 struct rsc *rsci; 917 }; 918 919 static int 920 svcauth_gss_set_client(struct svc_rqst *rqstp) 921 { 922 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 923 struct rsc *rsci = svcdata->rsci; 924 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 925 int stat; 926 927 /* 928 * A gss export can be specified either by: 929 * export *(sec=krb5,rw) 930 * or by 931 * export gss/krb5(rw) 932 * The latter is deprecated; but for backwards compatibility reasons 933 * the nfsd code will still fall back on trying it if the former 934 * doesn't work; so we try to make both available to nfsd, below. 935 */ 936 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 937 if (rqstp->rq_gssclient == NULL) 938 return SVC_DENIED; 939 stat = svcauth_unix_set_client(rqstp); 940 if (stat == SVC_DROP) 941 return stat; 942 return SVC_OK; 943 } 944 945 static inline int 946 gss_write_init_verf(struct svc_rqst *rqstp, struct rsi *rsip) 947 { 948 struct rsc *rsci; 949 int rc; 950 951 if (rsip->major_status != GSS_S_COMPLETE) 952 return gss_write_null_verf(rqstp); 953 rsci = gss_svc_searchbyctx(&rsip->out_handle); 954 if (rsci == NULL) { 955 rsip->major_status = GSS_S_NO_CONTEXT; 956 return gss_write_null_verf(rqstp); 957 } 958 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 959 cache_put(&rsci->h, &rsc_cache); 960 return rc; 961 } 962 963 /* 964 * Accept an rpcsec packet. 965 * If context establishment, punt to user space 966 * If data exchange, verify/decrypt 967 * If context destruction, handle here 968 * In the context establishment and destruction case we encode 969 * response here and return SVC_COMPLETE. 970 */ 971 static int 972 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 973 { 974 struct kvec *argv = &rqstp->rq_arg.head[0]; 975 struct kvec *resv = &rqstp->rq_res.head[0]; 976 u32 crlen; 977 struct xdr_netobj tmpobj; 978 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 979 struct rpc_gss_wire_cred *gc; 980 struct rsc *rsci = NULL; 981 struct rsi *rsip, rsikey; 982 __be32 *rpcstart; 983 __be32 *reject_stat = resv->iov_base + resv->iov_len; 984 int ret; 985 986 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 987 argv->iov_len); 988 989 *authp = rpc_autherr_badcred; 990 if (!svcdata) 991 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 992 if (!svcdata) 993 goto auth_err; 994 rqstp->rq_auth_data = svcdata; 995 svcdata->verf_start = NULL; 996 svcdata->rsci = NULL; 997 gc = &svcdata->clcred; 998 999 /* start of rpc packet is 7 u32's back from here: 1000 * xid direction rpcversion prog vers proc flavour 1001 */ 1002 rpcstart = argv->iov_base; 1003 rpcstart -= 7; 1004 1005 /* credential is: 1006 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1007 * at least 5 u32s, and is preceeded by length, so that makes 6. 1008 */ 1009 1010 if (argv->iov_len < 5 * 4) 1011 goto auth_err; 1012 crlen = svc_getnl(argv); 1013 if (svc_getnl(argv) != RPC_GSS_VERSION) 1014 goto auth_err; 1015 gc->gc_proc = svc_getnl(argv); 1016 gc->gc_seq = svc_getnl(argv); 1017 gc->gc_svc = svc_getnl(argv); 1018 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1019 goto auth_err; 1020 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1021 goto auth_err; 1022 1023 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1024 goto auth_err; 1025 1026 /* 1027 * We've successfully parsed the credential. Let's check out the 1028 * verifier. An AUTH_NULL verifier is allowed (and required) for 1029 * INIT and CONTINUE_INIT requests. AUTH_RPCSEC_GSS is required for 1030 * PROC_DATA and PROC_DESTROY. 1031 * 1032 * AUTH_NULL verifier is 0 (AUTH_NULL), 0 (length). 1033 * AUTH_RPCSEC_GSS verifier is: 1034 * 6 (AUTH_RPCSEC_GSS), length, checksum. 1035 * checksum is calculated over rpcheader from xid up to here. 1036 */ 1037 *authp = rpc_autherr_badverf; 1038 switch (gc->gc_proc) { 1039 case RPC_GSS_PROC_INIT: 1040 case RPC_GSS_PROC_CONTINUE_INIT: 1041 if (argv->iov_len < 2 * 4) 1042 goto auth_err; 1043 if (svc_getnl(argv) != RPC_AUTH_NULL) 1044 goto auth_err; 1045 if (svc_getnl(argv) != 0) 1046 goto auth_err; 1047 break; 1048 case RPC_GSS_PROC_DATA: 1049 case RPC_GSS_PROC_DESTROY: 1050 *authp = rpcsec_gsserr_credproblem; 1051 rsci = gss_svc_searchbyctx(&gc->gc_ctx); 1052 if (!rsci) 1053 goto auth_err; 1054 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1055 case SVC_OK: 1056 break; 1057 case SVC_DENIED: 1058 goto auth_err; 1059 case SVC_DROP: 1060 goto drop; 1061 } 1062 break; 1063 default: 1064 *authp = rpc_autherr_rejectedcred; 1065 goto auth_err; 1066 } 1067 1068 /* now act upon the command: */ 1069 switch (gc->gc_proc) { 1070 case RPC_GSS_PROC_INIT: 1071 case RPC_GSS_PROC_CONTINUE_INIT: 1072 *authp = rpc_autherr_badcred; 1073 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 1074 goto auth_err; 1075 memset(&rsikey, 0, sizeof(rsikey)); 1076 if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) 1077 goto drop; 1078 *authp = rpc_autherr_badverf; 1079 if (svc_safe_getnetobj(argv, &tmpobj)) { 1080 kfree(rsikey.in_handle.data); 1081 goto auth_err; 1082 } 1083 if (dup_netobj(&rsikey.in_token, &tmpobj)) { 1084 kfree(rsikey.in_handle.data); 1085 goto drop; 1086 } 1087 1088 rsip = rsi_lookup(&rsikey); 1089 rsi_free(&rsikey); 1090 if (!rsip) { 1091 goto drop; 1092 } 1093 switch(cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) { 1094 case -EAGAIN: 1095 case -ETIMEDOUT: 1096 case -ENOENT: 1097 goto drop; 1098 case 0: 1099 if (gss_write_init_verf(rqstp, rsip)) 1100 goto drop; 1101 if (resv->iov_len + 4 > PAGE_SIZE) 1102 goto drop; 1103 svc_putnl(resv, RPC_SUCCESS); 1104 if (svc_safe_putnetobj(resv, &rsip->out_handle)) 1105 goto drop; 1106 if (resv->iov_len + 3 * 4 > PAGE_SIZE) 1107 goto drop; 1108 svc_putnl(resv, rsip->major_status); 1109 svc_putnl(resv, rsip->minor_status); 1110 svc_putnl(resv, GSS_SEQ_WIN); 1111 if (svc_safe_putnetobj(resv, &rsip->out_token)) 1112 goto drop; 1113 } 1114 goto complete; 1115 case RPC_GSS_PROC_DESTROY: 1116 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1117 goto auth_err; 1118 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1119 if (resv->iov_len + 4 > PAGE_SIZE) 1120 goto drop; 1121 svc_putnl(resv, RPC_SUCCESS); 1122 goto complete; 1123 case RPC_GSS_PROC_DATA: 1124 *authp = rpcsec_gsserr_ctxproblem; 1125 svcdata->verf_start = resv->iov_base + resv->iov_len; 1126 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1127 goto auth_err; 1128 rqstp->rq_cred = rsci->cred; 1129 get_group_info(rsci->cred.cr_group_info); 1130 *authp = rpc_autherr_badcred; 1131 switch (gc->gc_svc) { 1132 case RPC_GSS_SVC_NONE: 1133 break; 1134 case RPC_GSS_SVC_INTEGRITY: 1135 if (unwrap_integ_data(&rqstp->rq_arg, 1136 gc->gc_seq, rsci->mechctx)) 1137 goto auth_err; 1138 /* placeholders for length and seq. number: */ 1139 svc_putnl(resv, 0); 1140 svc_putnl(resv, 0); 1141 break; 1142 case RPC_GSS_SVC_PRIVACY: 1143 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1144 gc->gc_seq, rsci->mechctx)) 1145 goto auth_err; 1146 /* placeholders for length and seq. number: */ 1147 svc_putnl(resv, 0); 1148 svc_putnl(resv, 0); 1149 break; 1150 default: 1151 goto auth_err; 1152 } 1153 svcdata->rsci = rsci; 1154 cache_get(&rsci->h); 1155 rqstp->rq_flavor = gss_svc_to_pseudoflavor( 1156 rsci->mechctx->mech_type, gc->gc_svc); 1157 ret = SVC_OK; 1158 goto out; 1159 } 1160 auth_err: 1161 /* Restore write pointer to original value: */ 1162 xdr_ressize_check(rqstp, reject_stat); 1163 ret = SVC_DENIED; 1164 goto out; 1165 complete: 1166 ret = SVC_COMPLETE; 1167 goto out; 1168 drop: 1169 ret = SVC_DROP; 1170 out: 1171 if (rsci) 1172 cache_put(&rsci->h, &rsc_cache); 1173 return ret; 1174 } 1175 1176 static __be32 * 1177 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1178 { 1179 __be32 *p; 1180 u32 verf_len; 1181 1182 p = gsd->verf_start; 1183 gsd->verf_start = NULL; 1184 1185 /* If the reply stat is nonzero, don't wrap: */ 1186 if (*(p-1) != rpc_success) 1187 return NULL; 1188 /* Skip the verifier: */ 1189 p += 1; 1190 verf_len = ntohl(*p++); 1191 p += XDR_QUADLEN(verf_len); 1192 /* move accept_stat to right place: */ 1193 memcpy(p, p + 2, 4); 1194 /* Also don't wrap if the accept stat is nonzero: */ 1195 if (*p != rpc_success) { 1196 resbuf->head[0].iov_len -= 2 * 4; 1197 return NULL; 1198 } 1199 p++; 1200 return p; 1201 } 1202 1203 static inline int 1204 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1205 { 1206 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1207 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1208 struct xdr_buf *resbuf = &rqstp->rq_res; 1209 struct xdr_buf integ_buf; 1210 struct xdr_netobj mic; 1211 struct kvec *resv; 1212 __be32 *p; 1213 int integ_offset, integ_len; 1214 int stat = -EINVAL; 1215 1216 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1217 if (p == NULL) 1218 goto out; 1219 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1220 integ_len = resbuf->len - integ_offset; 1221 BUG_ON(integ_len % 4); 1222 *p++ = htonl(integ_len); 1223 *p++ = htonl(gc->gc_seq); 1224 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1225 integ_len)) 1226 BUG(); 1227 if (resbuf->tail[0].iov_base == NULL) { 1228 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1229 goto out_err; 1230 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1231 + resbuf->head[0].iov_len; 1232 resbuf->tail[0].iov_len = 0; 1233 resv = &resbuf->tail[0]; 1234 } else { 1235 resv = &resbuf->tail[0]; 1236 } 1237 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1238 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1239 goto out_err; 1240 svc_putnl(resv, mic.len); 1241 memset(mic.data + mic.len, 0, 1242 round_up_to_quad(mic.len) - mic.len); 1243 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1244 /* not strictly required: */ 1245 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1246 BUG_ON(resv->iov_len > PAGE_SIZE); 1247 out: 1248 stat = 0; 1249 out_err: 1250 return stat; 1251 } 1252 1253 static inline int 1254 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1255 { 1256 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1257 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1258 struct xdr_buf *resbuf = &rqstp->rq_res; 1259 struct page **inpages = NULL; 1260 __be32 *p, *len; 1261 int offset; 1262 int pad; 1263 1264 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1265 if (p == NULL) 1266 return 0; 1267 len = p++; 1268 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1269 *p++ = htonl(gc->gc_seq); 1270 inpages = resbuf->pages; 1271 /* XXX: Would be better to write some xdr helper functions for 1272 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1273 if (resbuf->tail[0].iov_base) { 1274 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1275 + PAGE_SIZE); 1276 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1277 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1278 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1279 return -ENOMEM; 1280 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1281 resbuf->tail[0].iov_base, 1282 resbuf->tail[0].iov_len); 1283 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1284 } 1285 if (resbuf->tail[0].iov_base == NULL) { 1286 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1287 return -ENOMEM; 1288 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1289 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1290 resbuf->tail[0].iov_len = 0; 1291 } 1292 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1293 return -ENOMEM; 1294 *len = htonl(resbuf->len - offset); 1295 pad = 3 - ((resbuf->len - offset - 1)&3); 1296 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1297 memset(p, 0, pad); 1298 resbuf->tail[0].iov_len += pad; 1299 resbuf->len += pad; 1300 return 0; 1301 } 1302 1303 static int 1304 svcauth_gss_release(struct svc_rqst *rqstp) 1305 { 1306 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1307 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1308 struct xdr_buf *resbuf = &rqstp->rq_res; 1309 int stat = -EINVAL; 1310 1311 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1312 goto out; 1313 /* Release can be called twice, but we only wrap once. */ 1314 if (gsd->verf_start == NULL) 1315 goto out; 1316 /* normally not set till svc_send, but we need it here: */ 1317 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1318 * or whatever? */ 1319 resbuf->len = total_buf_len(resbuf); 1320 switch (gc->gc_svc) { 1321 case RPC_GSS_SVC_NONE: 1322 break; 1323 case RPC_GSS_SVC_INTEGRITY: 1324 stat = svcauth_gss_wrap_resp_integ(rqstp); 1325 if (stat) 1326 goto out_err; 1327 break; 1328 case RPC_GSS_SVC_PRIVACY: 1329 stat = svcauth_gss_wrap_resp_priv(rqstp); 1330 if (stat) 1331 goto out_err; 1332 break; 1333 default: 1334 goto out_err; 1335 } 1336 1337 out: 1338 stat = 0; 1339 out_err: 1340 if (rqstp->rq_client) 1341 auth_domain_put(rqstp->rq_client); 1342 rqstp->rq_client = NULL; 1343 if (rqstp->rq_gssclient) 1344 auth_domain_put(rqstp->rq_gssclient); 1345 rqstp->rq_gssclient = NULL; 1346 if (rqstp->rq_cred.cr_group_info) 1347 put_group_info(rqstp->rq_cred.cr_group_info); 1348 rqstp->rq_cred.cr_group_info = NULL; 1349 if (gsd->rsci) 1350 cache_put(&gsd->rsci->h, &rsc_cache); 1351 gsd->rsci = NULL; 1352 1353 return stat; 1354 } 1355 1356 static void 1357 svcauth_gss_domain_release(struct auth_domain *dom) 1358 { 1359 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1360 1361 kfree(dom->name); 1362 kfree(gd); 1363 } 1364 1365 static struct auth_ops svcauthops_gss = { 1366 .name = "rpcsec_gss", 1367 .owner = THIS_MODULE, 1368 .flavour = RPC_AUTH_GSS, 1369 .accept = svcauth_gss_accept, 1370 .release = svcauth_gss_release, 1371 .domain_release = svcauth_gss_domain_release, 1372 .set_client = svcauth_gss_set_client, 1373 }; 1374 1375 int 1376 gss_svc_init(void) 1377 { 1378 int rv = svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1379 if (rv == 0) { 1380 cache_register(&rsc_cache); 1381 cache_register(&rsi_cache); 1382 } 1383 return rv; 1384 } 1385 1386 void 1387 gss_svc_shutdown(void) 1388 { 1389 if (cache_unregister(&rsc_cache)) 1390 printk(KERN_ERR "auth_rpcgss: failed to unregister rsc cache\n"); 1391 if (cache_unregister(&rsi_cache)) 1392 printk(KERN_ERR "auth_rpcgss: failed to unregister rsi cache\n"); 1393 svc_auth_unregister(RPC_AUTH_GSS); 1394 } 1395