1 /* 2 * Neil Brown <neilb@cse.unsw.edu.au> 3 * J. Bruce Fields <bfields@umich.edu> 4 * Andy Adamson <andros@umich.edu> 5 * Dug Song <dugsong@monkey.org> 6 * 7 * RPCSEC_GSS server authentication. 8 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078 9 * (gssapi) 10 * 11 * The RPCSEC_GSS involves three stages: 12 * 1/ context creation 13 * 2/ data exchange 14 * 3/ context destruction 15 * 16 * Context creation is handled largely by upcalls to user-space. 17 * In particular, GSS_Accept_sec_context is handled by an upcall 18 * Data exchange is handled entirely within the kernel 19 * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel. 20 * Context destruction is handled in-kernel 21 * GSS_Delete_sec_context is in-kernel 22 * 23 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving. 24 * The context handle and gss_token are used as a key into the rpcsec_init cache. 25 * The content of this cache includes some of the outputs of GSS_Accept_sec_context, 26 * being major_status, minor_status, context_handle, reply_token. 27 * These are sent back to the client. 28 * Sequence window management is handled by the kernel. The window size if currently 29 * a compile time constant. 30 * 31 * When user-space is happy that a context is established, it places an entry 32 * in the rpcsec_context cache. The key for this cache is the context_handle. 33 * The content includes: 34 * uid/gidlist - for determining access rights 35 * mechanism type 36 * mechanism specific information, such as a key 37 * 38 */ 39 40 #include <linux/types.h> 41 #include <linux/module.h> 42 #include <linux/pagemap.h> 43 44 #include <linux/sunrpc/auth_gss.h> 45 #include <linux/sunrpc/svcauth.h> 46 #include <linux/sunrpc/gss_err.h> 47 #include <linux/sunrpc/svcauth.h> 48 #include <linux/sunrpc/svcauth_gss.h> 49 #include <linux/sunrpc/cache.h> 50 51 #ifdef RPC_DEBUG 52 # define RPCDBG_FACILITY RPCDBG_AUTH 53 #endif 54 55 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests 56 * into replies. 57 * 58 * Key is context handle (\x if empty) and gss_token. 59 * Content is major_status minor_status (integers) context_handle, reply_token. 60 * 61 */ 62 63 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) 64 { 65 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); 66 } 67 68 #define RSI_HASHBITS 6 69 #define RSI_HASHMAX (1<<RSI_HASHBITS) 70 #define RSI_HASHMASK (RSI_HASHMAX-1) 71 72 struct rsi { 73 struct cache_head h; 74 struct xdr_netobj in_handle, in_token; 75 struct xdr_netobj out_handle, out_token; 76 int major_status, minor_status; 77 }; 78 79 static struct cache_head *rsi_table[RSI_HASHMAX]; 80 static struct cache_detail rsi_cache; 81 static struct rsi *rsi_update(struct rsi *new, struct rsi *old); 82 static struct rsi *rsi_lookup(struct rsi *item); 83 84 static void rsi_free(struct rsi *rsii) 85 { 86 kfree(rsii->in_handle.data); 87 kfree(rsii->in_token.data); 88 kfree(rsii->out_handle.data); 89 kfree(rsii->out_token.data); 90 } 91 92 static void rsi_put(struct kref *ref) 93 { 94 struct rsi *rsii = container_of(ref, struct rsi, h.ref); 95 rsi_free(rsii); 96 kfree(rsii); 97 } 98 99 static inline int rsi_hash(struct rsi *item) 100 { 101 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS) 102 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS); 103 } 104 105 static int rsi_match(struct cache_head *a, struct cache_head *b) 106 { 107 struct rsi *item = container_of(a, struct rsi, h); 108 struct rsi *tmp = container_of(b, struct rsi, h); 109 return netobj_equal(&item->in_handle, &tmp->in_handle) 110 && netobj_equal(&item->in_token, &tmp->in_token); 111 } 112 113 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len) 114 { 115 dst->len = len; 116 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL); 117 if (len && !dst->data) 118 return -ENOMEM; 119 return 0; 120 } 121 122 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src) 123 { 124 return dup_to_netobj(dst, src->data, src->len); 125 } 126 127 static void rsi_init(struct cache_head *cnew, struct cache_head *citem) 128 { 129 struct rsi *new = container_of(cnew, struct rsi, h); 130 struct rsi *item = container_of(citem, struct rsi, h); 131 132 new->out_handle.data = NULL; 133 new->out_handle.len = 0; 134 new->out_token.data = NULL; 135 new->out_token.len = 0; 136 new->in_handle.len = item->in_handle.len; 137 item->in_handle.len = 0; 138 new->in_token.len = item->in_token.len; 139 item->in_token.len = 0; 140 new->in_handle.data = item->in_handle.data; 141 item->in_handle.data = NULL; 142 new->in_token.data = item->in_token.data; 143 item->in_token.data = NULL; 144 } 145 146 static void update_rsi(struct cache_head *cnew, struct cache_head *citem) 147 { 148 struct rsi *new = container_of(cnew, struct rsi, h); 149 struct rsi *item = container_of(citem, struct rsi, h); 150 151 BUG_ON(new->out_handle.data || new->out_token.data); 152 new->out_handle.len = item->out_handle.len; 153 item->out_handle.len = 0; 154 new->out_token.len = item->out_token.len; 155 item->out_token.len = 0; 156 new->out_handle.data = item->out_handle.data; 157 item->out_handle.data = NULL; 158 new->out_token.data = item->out_token.data; 159 item->out_token.data = NULL; 160 161 new->major_status = item->major_status; 162 new->minor_status = item->minor_status; 163 } 164 165 static struct cache_head *rsi_alloc(void) 166 { 167 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL); 168 if (rsii) 169 return &rsii->h; 170 else 171 return NULL; 172 } 173 174 static void rsi_request(struct cache_detail *cd, 175 struct cache_head *h, 176 char **bpp, int *blen) 177 { 178 struct rsi *rsii = container_of(h, struct rsi, h); 179 180 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len); 181 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len); 182 (*bpp)[-1] = '\n'; 183 } 184 185 186 static int rsi_parse(struct cache_detail *cd, 187 char *mesg, int mlen) 188 { 189 /* context token expiry major minor context token */ 190 char *buf = mesg; 191 char *ep; 192 int len; 193 struct rsi rsii, *rsip = NULL; 194 time_t expiry; 195 int status = -EINVAL; 196 197 memset(&rsii, 0, sizeof(rsii)); 198 /* handle */ 199 len = qword_get(&mesg, buf, mlen); 200 if (len < 0) 201 goto out; 202 status = -ENOMEM; 203 if (dup_to_netobj(&rsii.in_handle, buf, len)) 204 goto out; 205 206 /* token */ 207 len = qword_get(&mesg, buf, mlen); 208 status = -EINVAL; 209 if (len < 0) 210 goto out; 211 status = -ENOMEM; 212 if (dup_to_netobj(&rsii.in_token, buf, len)) 213 goto out; 214 215 rsip = rsi_lookup(&rsii); 216 if (!rsip) 217 goto out; 218 219 rsii.h.flags = 0; 220 /* expiry */ 221 expiry = get_expiry(&mesg); 222 status = -EINVAL; 223 if (expiry == 0) 224 goto out; 225 226 /* major/minor */ 227 len = qword_get(&mesg, buf, mlen); 228 if (len < 0) 229 goto out; 230 if (len == 0) { 231 goto out; 232 } else { 233 rsii.major_status = simple_strtoul(buf, &ep, 10); 234 if (*ep) 235 goto out; 236 len = qword_get(&mesg, buf, mlen); 237 if (len <= 0) 238 goto out; 239 rsii.minor_status = simple_strtoul(buf, &ep, 10); 240 if (*ep) 241 goto out; 242 243 /* out_handle */ 244 len = qword_get(&mesg, buf, mlen); 245 if (len < 0) 246 goto out; 247 status = -ENOMEM; 248 if (dup_to_netobj(&rsii.out_handle, buf, len)) 249 goto out; 250 251 /* out_token */ 252 len = qword_get(&mesg, buf, mlen); 253 status = -EINVAL; 254 if (len < 0) 255 goto out; 256 status = -ENOMEM; 257 if (dup_to_netobj(&rsii.out_token, buf, len)) 258 goto out; 259 } 260 rsii.h.expiry_time = expiry; 261 rsip = rsi_update(&rsii, rsip); 262 status = 0; 263 out: 264 rsi_free(&rsii); 265 if (rsip) 266 cache_put(&rsip->h, &rsi_cache); 267 else 268 status = -ENOMEM; 269 return status; 270 } 271 272 static struct cache_detail rsi_cache = { 273 .owner = THIS_MODULE, 274 .hash_size = RSI_HASHMAX, 275 .hash_table = rsi_table, 276 .name = "auth.rpcsec.init", 277 .cache_put = rsi_put, 278 .cache_request = rsi_request, 279 .cache_parse = rsi_parse, 280 .match = rsi_match, 281 .init = rsi_init, 282 .update = update_rsi, 283 .alloc = rsi_alloc, 284 }; 285 286 static struct rsi *rsi_lookup(struct rsi *item) 287 { 288 struct cache_head *ch; 289 int hash = rsi_hash(item); 290 291 ch = sunrpc_cache_lookup(&rsi_cache, &item->h, hash); 292 if (ch) 293 return container_of(ch, struct rsi, h); 294 else 295 return NULL; 296 } 297 298 static struct rsi *rsi_update(struct rsi *new, struct rsi *old) 299 { 300 struct cache_head *ch; 301 int hash = rsi_hash(new); 302 303 ch = sunrpc_cache_update(&rsi_cache, &new->h, 304 &old->h, hash); 305 if (ch) 306 return container_of(ch, struct rsi, h); 307 else 308 return NULL; 309 } 310 311 312 /* 313 * The rpcsec_context cache is used to store a context that is 314 * used in data exchange. 315 * The key is a context handle. The content is: 316 * uid, gidlist, mechanism, service-set, mech-specific-data 317 */ 318 319 #define RSC_HASHBITS 10 320 #define RSC_HASHMAX (1<<RSC_HASHBITS) 321 #define RSC_HASHMASK (RSC_HASHMAX-1) 322 323 #define GSS_SEQ_WIN 128 324 325 struct gss_svc_seq_data { 326 /* highest seq number seen so far: */ 327 int sd_max; 328 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 329 * sd_win is nonzero iff sequence number i has been seen already: */ 330 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 331 spinlock_t sd_lock; 332 }; 333 334 struct rsc { 335 struct cache_head h; 336 struct xdr_netobj handle; 337 struct svc_cred cred; 338 struct gss_svc_seq_data seqdata; 339 struct gss_ctx *mechctx; 340 }; 341 342 static struct cache_head *rsc_table[RSC_HASHMAX]; 343 static struct cache_detail rsc_cache; 344 static struct rsc *rsc_update(struct rsc *new, struct rsc *old); 345 static struct rsc *rsc_lookup(struct rsc *item); 346 347 static void rsc_free(struct rsc *rsci) 348 { 349 kfree(rsci->handle.data); 350 if (rsci->mechctx) 351 gss_delete_sec_context(&rsci->mechctx); 352 if (rsci->cred.cr_group_info) 353 put_group_info(rsci->cred.cr_group_info); 354 } 355 356 static void rsc_put(struct kref *ref) 357 { 358 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 359 360 rsc_free(rsci); 361 kfree(rsci); 362 } 363 364 static inline int 365 rsc_hash(struct rsc *rsci) 366 { 367 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 368 } 369 370 static int 371 rsc_match(struct cache_head *a, struct cache_head *b) 372 { 373 struct rsc *new = container_of(a, struct rsc, h); 374 struct rsc *tmp = container_of(b, struct rsc, h); 375 376 return netobj_equal(&new->handle, &tmp->handle); 377 } 378 379 static void 380 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 381 { 382 struct rsc *new = container_of(cnew, struct rsc, h); 383 struct rsc *tmp = container_of(ctmp, struct rsc, h); 384 385 new->handle.len = tmp->handle.len; 386 tmp->handle.len = 0; 387 new->handle.data = tmp->handle.data; 388 tmp->handle.data = NULL; 389 new->mechctx = NULL; 390 new->cred.cr_group_info = NULL; 391 } 392 393 static void 394 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 395 { 396 struct rsc *new = container_of(cnew, struct rsc, h); 397 struct rsc *tmp = container_of(ctmp, struct rsc, h); 398 399 new->mechctx = tmp->mechctx; 400 tmp->mechctx = NULL; 401 memset(&new->seqdata, 0, sizeof(new->seqdata)); 402 spin_lock_init(&new->seqdata.sd_lock); 403 new->cred = tmp->cred; 404 tmp->cred.cr_group_info = NULL; 405 } 406 407 static struct cache_head * 408 rsc_alloc(void) 409 { 410 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 411 if (rsci) 412 return &rsci->h; 413 else 414 return NULL; 415 } 416 417 static int rsc_parse(struct cache_detail *cd, 418 char *mesg, int mlen) 419 { 420 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 421 char *buf = mesg; 422 int len, rv; 423 struct rsc rsci, *rscp = NULL; 424 time_t expiry; 425 int status = -EINVAL; 426 struct gss_api_mech *gm = NULL; 427 428 memset(&rsci, 0, sizeof(rsci)); 429 /* context handle */ 430 len = qword_get(&mesg, buf, mlen); 431 if (len < 0) goto out; 432 status = -ENOMEM; 433 if (dup_to_netobj(&rsci.handle, buf, len)) 434 goto out; 435 436 rsci.h.flags = 0; 437 /* expiry */ 438 expiry = get_expiry(&mesg); 439 status = -EINVAL; 440 if (expiry == 0) 441 goto out; 442 443 rscp = rsc_lookup(&rsci); 444 if (!rscp) 445 goto out; 446 447 /* uid, or NEGATIVE */ 448 rv = get_int(&mesg, &rsci.cred.cr_uid); 449 if (rv == -EINVAL) 450 goto out; 451 if (rv == -ENOENT) 452 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 453 else { 454 int N, i; 455 456 /* gid */ 457 if (get_int(&mesg, &rsci.cred.cr_gid)) 458 goto out; 459 460 /* number of additional gid's */ 461 if (get_int(&mesg, &N)) 462 goto out; 463 status = -ENOMEM; 464 rsci.cred.cr_group_info = groups_alloc(N); 465 if (rsci.cred.cr_group_info == NULL) 466 goto out; 467 468 /* gid's */ 469 status = -EINVAL; 470 for (i=0; i<N; i++) { 471 gid_t gid; 472 if (get_int(&mesg, &gid)) 473 goto out; 474 GROUP_AT(rsci.cred.cr_group_info, i) = gid; 475 } 476 477 /* mech name */ 478 len = qword_get(&mesg, buf, mlen); 479 if (len < 0) 480 goto out; 481 gm = gss_mech_get_by_name(buf); 482 status = -EOPNOTSUPP; 483 if (!gm) 484 goto out; 485 486 status = -EINVAL; 487 /* mech-specific data: */ 488 len = qword_get(&mesg, buf, mlen); 489 if (len < 0) 490 goto out; 491 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx); 492 if (status) 493 goto out; 494 } 495 rsci.h.expiry_time = expiry; 496 rscp = rsc_update(&rsci, rscp); 497 status = 0; 498 out: 499 gss_mech_put(gm); 500 rsc_free(&rsci); 501 if (rscp) 502 cache_put(&rscp->h, &rsc_cache); 503 else 504 status = -ENOMEM; 505 return status; 506 } 507 508 static struct cache_detail rsc_cache = { 509 .owner = THIS_MODULE, 510 .hash_size = RSC_HASHMAX, 511 .hash_table = rsc_table, 512 .name = "auth.rpcsec.context", 513 .cache_put = rsc_put, 514 .cache_parse = rsc_parse, 515 .match = rsc_match, 516 .init = rsc_init, 517 .update = update_rsc, 518 .alloc = rsc_alloc, 519 }; 520 521 static struct rsc *rsc_lookup(struct rsc *item) 522 { 523 struct cache_head *ch; 524 int hash = rsc_hash(item); 525 526 ch = sunrpc_cache_lookup(&rsc_cache, &item->h, hash); 527 if (ch) 528 return container_of(ch, struct rsc, h); 529 else 530 return NULL; 531 } 532 533 static struct rsc *rsc_update(struct rsc *new, struct rsc *old) 534 { 535 struct cache_head *ch; 536 int hash = rsc_hash(new); 537 538 ch = sunrpc_cache_update(&rsc_cache, &new->h, 539 &old->h, hash); 540 if (ch) 541 return container_of(ch, struct rsc, h); 542 else 543 return NULL; 544 } 545 546 547 static struct rsc * 548 gss_svc_searchbyctx(struct xdr_netobj *handle) 549 { 550 struct rsc rsci; 551 struct rsc *found; 552 553 memset(&rsci, 0, sizeof(rsci)); 554 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 555 return NULL; 556 found = rsc_lookup(&rsci); 557 rsc_free(&rsci); 558 if (!found) 559 return NULL; 560 if (cache_check(&rsc_cache, &found->h, NULL)) 561 return NULL; 562 return found; 563 } 564 565 /* Implements sequence number algorithm as specified in RFC 2203. */ 566 static int 567 gss_check_seq_num(struct rsc *rsci, int seq_num) 568 { 569 struct gss_svc_seq_data *sd = &rsci->seqdata; 570 571 spin_lock(&sd->sd_lock); 572 if (seq_num > sd->sd_max) { 573 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 574 memset(sd->sd_win,0,sizeof(sd->sd_win)); 575 sd->sd_max = seq_num; 576 } else while (sd->sd_max < seq_num) { 577 sd->sd_max++; 578 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 579 } 580 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 581 goto ok; 582 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 583 goto drop; 584 } 585 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 586 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 587 goto drop; 588 ok: 589 spin_unlock(&sd->sd_lock); 590 return 1; 591 drop: 592 spin_unlock(&sd->sd_lock); 593 return 0; 594 } 595 596 static inline u32 round_up_to_quad(u32 i) 597 { 598 return (i + 3 ) & ~3; 599 } 600 601 static inline int 602 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 603 { 604 int l; 605 606 if (argv->iov_len < 4) 607 return -1; 608 o->len = svc_getnl(argv); 609 l = round_up_to_quad(o->len); 610 if (argv->iov_len < l) 611 return -1; 612 o->data = argv->iov_base; 613 argv->iov_base += l; 614 argv->iov_len -= l; 615 return 0; 616 } 617 618 static inline int 619 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 620 { 621 u8 *p; 622 623 if (resv->iov_len + 4 > PAGE_SIZE) 624 return -1; 625 svc_putnl(resv, o->len); 626 p = resv->iov_base + resv->iov_len; 627 resv->iov_len += round_up_to_quad(o->len); 628 if (resv->iov_len > PAGE_SIZE) 629 return -1; 630 memcpy(p, o->data, o->len); 631 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 632 return 0; 633 } 634 635 /* Verify the checksum on the header and return SVC_OK on success. 636 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 637 * or return SVC_DENIED and indicate error in authp. 638 */ 639 static int 640 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 641 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 642 { 643 struct gss_ctx *ctx_id = rsci->mechctx; 644 struct xdr_buf rpchdr; 645 struct xdr_netobj checksum; 646 u32 flavor = 0; 647 struct kvec *argv = &rqstp->rq_arg.head[0]; 648 struct kvec iov; 649 650 /* data to compute the checksum over: */ 651 iov.iov_base = rpcstart; 652 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 653 xdr_buf_from_iov(&iov, &rpchdr); 654 655 *authp = rpc_autherr_badverf; 656 if (argv->iov_len < 4) 657 return SVC_DENIED; 658 flavor = svc_getnl(argv); 659 if (flavor != RPC_AUTH_GSS) 660 return SVC_DENIED; 661 if (svc_safe_getnetobj(argv, &checksum)) 662 return SVC_DENIED; 663 664 if (rqstp->rq_deferred) /* skip verification of revisited request */ 665 return SVC_OK; 666 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 667 *authp = rpcsec_gsserr_credproblem; 668 return SVC_DENIED; 669 } 670 671 if (gc->gc_seq > MAXSEQ) { 672 dprintk("RPC: svcauth_gss: discarding request with " 673 "large sequence number %d\n", gc->gc_seq); 674 *authp = rpcsec_gsserr_ctxproblem; 675 return SVC_DENIED; 676 } 677 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 678 dprintk("RPC: svcauth_gss: discarding request with " 679 "old sequence number %d\n", gc->gc_seq); 680 return SVC_DROP; 681 } 682 return SVC_OK; 683 } 684 685 static int 686 gss_write_null_verf(struct svc_rqst *rqstp) 687 { 688 __be32 *p; 689 690 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 691 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 692 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 693 *p++ = 0; 694 if (!xdr_ressize_check(rqstp, p)) 695 return -1; 696 return 0; 697 } 698 699 static int 700 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 701 { 702 __be32 xdr_seq; 703 u32 maj_stat; 704 struct xdr_buf verf_data; 705 struct xdr_netobj mic; 706 __be32 *p; 707 struct kvec iov; 708 709 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 710 xdr_seq = htonl(seq); 711 712 iov.iov_base = &xdr_seq; 713 iov.iov_len = sizeof(xdr_seq); 714 xdr_buf_from_iov(&iov, &verf_data); 715 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 716 mic.data = (u8 *)(p + 1); 717 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 718 if (maj_stat != GSS_S_COMPLETE) 719 return -1; 720 *p++ = htonl(mic.len); 721 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 722 p += XDR_QUADLEN(mic.len); 723 if (!xdr_ressize_check(rqstp, p)) 724 return -1; 725 return 0; 726 } 727 728 struct gss_domain { 729 struct auth_domain h; 730 u32 pseudoflavor; 731 }; 732 733 static struct auth_domain * 734 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 735 { 736 char *name; 737 738 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 739 if (!name) 740 return NULL; 741 return auth_domain_find(name); 742 } 743 744 static struct auth_ops svcauthops_gss; 745 746 u32 svcauth_gss_flavor(struct auth_domain *dom) 747 { 748 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 749 750 return gd->pseudoflavor; 751 } 752 753 EXPORT_SYMBOL(svcauth_gss_flavor); 754 755 int 756 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 757 { 758 struct gss_domain *new; 759 struct auth_domain *test; 760 int stat = -ENOMEM; 761 762 new = kmalloc(sizeof(*new), GFP_KERNEL); 763 if (!new) 764 goto out; 765 kref_init(&new->h.ref); 766 new->h.name = kstrdup(name, GFP_KERNEL); 767 if (!new->h.name) 768 goto out_free_dom; 769 new->h.flavour = &svcauthops_gss; 770 new->pseudoflavor = pseudoflavor; 771 772 stat = 0; 773 test = auth_domain_lookup(name, &new->h); 774 if (test != &new->h) { /* Duplicate registration */ 775 auth_domain_put(test); 776 kfree(new->h.name); 777 goto out_free_dom; 778 } 779 return 0; 780 781 out_free_dom: 782 kfree(new); 783 out: 784 return stat; 785 } 786 787 EXPORT_SYMBOL(svcauth_gss_register_pseudoflavor); 788 789 static inline int 790 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 791 { 792 __be32 raw; 793 int status; 794 795 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 796 if (status) 797 return status; 798 *obj = ntohl(raw); 799 return 0; 800 } 801 802 /* It would be nice if this bit of code could be shared with the client. 803 * Obstacles: 804 * The client shouldn't malloc(), would have to pass in own memory. 805 * The server uses base of head iovec as read pointer, while the 806 * client uses separate pointer. */ 807 static int 808 unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 809 { 810 int stat = -EINVAL; 811 u32 integ_len, maj_stat; 812 struct xdr_netobj mic; 813 struct xdr_buf integ_buf; 814 815 integ_len = svc_getnl(&buf->head[0]); 816 if (integ_len & 3) 817 return stat; 818 if (integ_len > buf->len) 819 return stat; 820 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 821 BUG(); 822 /* copy out mic... */ 823 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 824 BUG(); 825 if (mic.len > RPC_MAX_AUTH_SIZE) 826 return stat; 827 mic.data = kmalloc(mic.len, GFP_KERNEL); 828 if (!mic.data) 829 return stat; 830 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 831 goto out; 832 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 833 if (maj_stat != GSS_S_COMPLETE) 834 goto out; 835 if (svc_getnl(&buf->head[0]) != seq) 836 goto out; 837 stat = 0; 838 out: 839 kfree(mic.data); 840 return stat; 841 } 842 843 static inline int 844 total_buf_len(struct xdr_buf *buf) 845 { 846 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 847 } 848 849 static void 850 fix_priv_head(struct xdr_buf *buf, int pad) 851 { 852 if (buf->page_len == 0) { 853 /* We need to adjust head and buf->len in tandem in this 854 * case to make svc_defer() work--it finds the original 855 * buffer start using buf->len - buf->head[0].iov_len. */ 856 buf->head[0].iov_len -= pad; 857 } 858 } 859 860 static int 861 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 862 { 863 u32 priv_len, maj_stat; 864 int pad, saved_len, remaining_len, offset; 865 866 rqstp->rq_splice_ok = 0; 867 868 priv_len = svc_getnl(&buf->head[0]); 869 if (rqstp->rq_deferred) { 870 /* Already decrypted last time through! The sequence number 871 * check at out_seq is unnecessary but harmless: */ 872 goto out_seq; 873 } 874 /* buf->len is the number of bytes from the original start of the 875 * request to the end, where head[0].iov_len is just the bytes 876 * not yet read from the head, so these two values are different: */ 877 remaining_len = total_buf_len(buf); 878 if (priv_len > remaining_len) 879 return -EINVAL; 880 pad = remaining_len - priv_len; 881 buf->len -= pad; 882 fix_priv_head(buf, pad); 883 884 /* Maybe it would be better to give gss_unwrap a length parameter: */ 885 saved_len = buf->len; 886 buf->len = priv_len; 887 maj_stat = gss_unwrap(ctx, 0, buf); 888 pad = priv_len - buf->len; 889 buf->len = saved_len; 890 buf->len -= pad; 891 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 892 * In the krb5p case, at least, the data ends up offset, so we need to 893 * move it around. */ 894 /* XXX: This is very inefficient. It would be better to either do 895 * this while we encrypt, or maybe in the receive code, if we can peak 896 * ahead and work out the service and mechanism there. */ 897 offset = buf->head[0].iov_len % 4; 898 if (offset) { 899 buf->buflen = RPCSVC_MAXPAYLOAD; 900 xdr_shift_buf(buf, offset); 901 fix_priv_head(buf, pad); 902 } 903 if (maj_stat != GSS_S_COMPLETE) 904 return -EINVAL; 905 out_seq: 906 if (svc_getnl(&buf->head[0]) != seq) 907 return -EINVAL; 908 return 0; 909 } 910 911 struct gss_svc_data { 912 /* decoded gss client cred: */ 913 struct rpc_gss_wire_cred clcred; 914 /* save a pointer to the beginning of the encoded verifier, 915 * for use in encryption/checksumming in svcauth_gss_release: */ 916 __be32 *verf_start; 917 struct rsc *rsci; 918 }; 919 920 static int 921 svcauth_gss_set_client(struct svc_rqst *rqstp) 922 { 923 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 924 struct rsc *rsci = svcdata->rsci; 925 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 926 int stat; 927 928 /* 929 * A gss export can be specified either by: 930 * export *(sec=krb5,rw) 931 * or by 932 * export gss/krb5(rw) 933 * The latter is deprecated; but for backwards compatibility reasons 934 * the nfsd code will still fall back on trying it if the former 935 * doesn't work; so we try to make both available to nfsd, below. 936 */ 937 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 938 if (rqstp->rq_gssclient == NULL) 939 return SVC_DENIED; 940 stat = svcauth_unix_set_client(rqstp); 941 if (stat == SVC_DROP) 942 return stat; 943 return SVC_OK; 944 } 945 946 static inline int 947 gss_write_init_verf(struct svc_rqst *rqstp, struct rsi *rsip) 948 { 949 struct rsc *rsci; 950 int rc; 951 952 if (rsip->major_status != GSS_S_COMPLETE) 953 return gss_write_null_verf(rqstp); 954 rsci = gss_svc_searchbyctx(&rsip->out_handle); 955 if (rsci == NULL) { 956 rsip->major_status = GSS_S_NO_CONTEXT; 957 return gss_write_null_verf(rqstp); 958 } 959 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 960 cache_put(&rsci->h, &rsc_cache); 961 return rc; 962 } 963 964 /* 965 * Accept an rpcsec packet. 966 * If context establishment, punt to user space 967 * If data exchange, verify/decrypt 968 * If context destruction, handle here 969 * In the context establishment and destruction case we encode 970 * response here and return SVC_COMPLETE. 971 */ 972 static int 973 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 974 { 975 struct kvec *argv = &rqstp->rq_arg.head[0]; 976 struct kvec *resv = &rqstp->rq_res.head[0]; 977 u32 crlen; 978 struct xdr_netobj tmpobj; 979 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 980 struct rpc_gss_wire_cred *gc; 981 struct rsc *rsci = NULL; 982 struct rsi *rsip, rsikey; 983 __be32 *rpcstart; 984 __be32 *reject_stat = resv->iov_base + resv->iov_len; 985 int ret; 986 987 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 988 argv->iov_len); 989 990 *authp = rpc_autherr_badcred; 991 if (!svcdata) 992 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 993 if (!svcdata) 994 goto auth_err; 995 rqstp->rq_auth_data = svcdata; 996 svcdata->verf_start = NULL; 997 svcdata->rsci = NULL; 998 gc = &svcdata->clcred; 999 1000 /* start of rpc packet is 7 u32's back from here: 1001 * xid direction rpcversion prog vers proc flavour 1002 */ 1003 rpcstart = argv->iov_base; 1004 rpcstart -= 7; 1005 1006 /* credential is: 1007 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1008 * at least 5 u32s, and is preceeded by length, so that makes 6. 1009 */ 1010 1011 if (argv->iov_len < 5 * 4) 1012 goto auth_err; 1013 crlen = svc_getnl(argv); 1014 if (svc_getnl(argv) != RPC_GSS_VERSION) 1015 goto auth_err; 1016 gc->gc_proc = svc_getnl(argv); 1017 gc->gc_seq = svc_getnl(argv); 1018 gc->gc_svc = svc_getnl(argv); 1019 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1020 goto auth_err; 1021 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1022 goto auth_err; 1023 1024 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1025 goto auth_err; 1026 1027 /* 1028 * We've successfully parsed the credential. Let's check out the 1029 * verifier. An AUTH_NULL verifier is allowed (and required) for 1030 * INIT and CONTINUE_INIT requests. AUTH_RPCSEC_GSS is required for 1031 * PROC_DATA and PROC_DESTROY. 1032 * 1033 * AUTH_NULL verifier is 0 (AUTH_NULL), 0 (length). 1034 * AUTH_RPCSEC_GSS verifier is: 1035 * 6 (AUTH_RPCSEC_GSS), length, checksum. 1036 * checksum is calculated over rpcheader from xid up to here. 1037 */ 1038 *authp = rpc_autherr_badverf; 1039 switch (gc->gc_proc) { 1040 case RPC_GSS_PROC_INIT: 1041 case RPC_GSS_PROC_CONTINUE_INIT: 1042 if (argv->iov_len < 2 * 4) 1043 goto auth_err; 1044 if (svc_getnl(argv) != RPC_AUTH_NULL) 1045 goto auth_err; 1046 if (svc_getnl(argv) != 0) 1047 goto auth_err; 1048 break; 1049 case RPC_GSS_PROC_DATA: 1050 case RPC_GSS_PROC_DESTROY: 1051 *authp = rpcsec_gsserr_credproblem; 1052 rsci = gss_svc_searchbyctx(&gc->gc_ctx); 1053 if (!rsci) 1054 goto auth_err; 1055 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1056 case SVC_OK: 1057 break; 1058 case SVC_DENIED: 1059 goto auth_err; 1060 case SVC_DROP: 1061 goto drop; 1062 } 1063 break; 1064 default: 1065 *authp = rpc_autherr_rejectedcred; 1066 goto auth_err; 1067 } 1068 1069 /* now act upon the command: */ 1070 switch (gc->gc_proc) { 1071 case RPC_GSS_PROC_INIT: 1072 case RPC_GSS_PROC_CONTINUE_INIT: 1073 *authp = rpc_autherr_badcred; 1074 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 1075 goto auth_err; 1076 memset(&rsikey, 0, sizeof(rsikey)); 1077 if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) 1078 goto drop; 1079 *authp = rpc_autherr_badverf; 1080 if (svc_safe_getnetobj(argv, &tmpobj)) { 1081 kfree(rsikey.in_handle.data); 1082 goto auth_err; 1083 } 1084 if (dup_netobj(&rsikey.in_token, &tmpobj)) { 1085 kfree(rsikey.in_handle.data); 1086 goto drop; 1087 } 1088 1089 rsip = rsi_lookup(&rsikey); 1090 rsi_free(&rsikey); 1091 if (!rsip) { 1092 goto drop; 1093 } 1094 switch(cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) { 1095 case -EAGAIN: 1096 case -ETIMEDOUT: 1097 case -ENOENT: 1098 goto drop; 1099 case 0: 1100 if (gss_write_init_verf(rqstp, rsip)) 1101 goto drop; 1102 if (resv->iov_len + 4 > PAGE_SIZE) 1103 goto drop; 1104 svc_putnl(resv, RPC_SUCCESS); 1105 if (svc_safe_putnetobj(resv, &rsip->out_handle)) 1106 goto drop; 1107 if (resv->iov_len + 3 * 4 > PAGE_SIZE) 1108 goto drop; 1109 svc_putnl(resv, rsip->major_status); 1110 svc_putnl(resv, rsip->minor_status); 1111 svc_putnl(resv, GSS_SEQ_WIN); 1112 if (svc_safe_putnetobj(resv, &rsip->out_token)) 1113 goto drop; 1114 } 1115 goto complete; 1116 case RPC_GSS_PROC_DESTROY: 1117 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1118 goto auth_err; 1119 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1120 if (resv->iov_len + 4 > PAGE_SIZE) 1121 goto drop; 1122 svc_putnl(resv, RPC_SUCCESS); 1123 goto complete; 1124 case RPC_GSS_PROC_DATA: 1125 *authp = rpcsec_gsserr_ctxproblem; 1126 svcdata->verf_start = resv->iov_base + resv->iov_len; 1127 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1128 goto auth_err; 1129 rqstp->rq_cred = rsci->cred; 1130 get_group_info(rsci->cred.cr_group_info); 1131 *authp = rpc_autherr_badcred; 1132 switch (gc->gc_svc) { 1133 case RPC_GSS_SVC_NONE: 1134 break; 1135 case RPC_GSS_SVC_INTEGRITY: 1136 if (unwrap_integ_data(&rqstp->rq_arg, 1137 gc->gc_seq, rsci->mechctx)) 1138 goto auth_err; 1139 /* placeholders for length and seq. number: */ 1140 svc_putnl(resv, 0); 1141 svc_putnl(resv, 0); 1142 break; 1143 case RPC_GSS_SVC_PRIVACY: 1144 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1145 gc->gc_seq, rsci->mechctx)) 1146 goto auth_err; 1147 /* placeholders for length and seq. number: */ 1148 svc_putnl(resv, 0); 1149 svc_putnl(resv, 0); 1150 break; 1151 default: 1152 goto auth_err; 1153 } 1154 svcdata->rsci = rsci; 1155 cache_get(&rsci->h); 1156 rqstp->rq_flavor = gss_svc_to_pseudoflavor( 1157 rsci->mechctx->mech_type, gc->gc_svc); 1158 ret = SVC_OK; 1159 goto out; 1160 } 1161 auth_err: 1162 /* Restore write pointer to original value: */ 1163 xdr_ressize_check(rqstp, reject_stat); 1164 ret = SVC_DENIED; 1165 goto out; 1166 complete: 1167 ret = SVC_COMPLETE; 1168 goto out; 1169 drop: 1170 ret = SVC_DROP; 1171 out: 1172 if (rsci) 1173 cache_put(&rsci->h, &rsc_cache); 1174 return ret; 1175 } 1176 1177 static __be32 * 1178 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1179 { 1180 __be32 *p; 1181 u32 verf_len; 1182 1183 p = gsd->verf_start; 1184 gsd->verf_start = NULL; 1185 1186 /* If the reply stat is nonzero, don't wrap: */ 1187 if (*(p-1) != rpc_success) 1188 return NULL; 1189 /* Skip the verifier: */ 1190 p += 1; 1191 verf_len = ntohl(*p++); 1192 p += XDR_QUADLEN(verf_len); 1193 /* move accept_stat to right place: */ 1194 memcpy(p, p + 2, 4); 1195 /* Also don't wrap if the accept stat is nonzero: */ 1196 if (*p != rpc_success) { 1197 resbuf->head[0].iov_len -= 2 * 4; 1198 return NULL; 1199 } 1200 p++; 1201 return p; 1202 } 1203 1204 static inline int 1205 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1206 { 1207 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1208 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1209 struct xdr_buf *resbuf = &rqstp->rq_res; 1210 struct xdr_buf integ_buf; 1211 struct xdr_netobj mic; 1212 struct kvec *resv; 1213 __be32 *p; 1214 int integ_offset, integ_len; 1215 int stat = -EINVAL; 1216 1217 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1218 if (p == NULL) 1219 goto out; 1220 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1221 integ_len = resbuf->len - integ_offset; 1222 BUG_ON(integ_len % 4); 1223 *p++ = htonl(integ_len); 1224 *p++ = htonl(gc->gc_seq); 1225 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1226 integ_len)) 1227 BUG(); 1228 if (resbuf->tail[0].iov_base == NULL) { 1229 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1230 goto out_err; 1231 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1232 + resbuf->head[0].iov_len; 1233 resbuf->tail[0].iov_len = 0; 1234 resv = &resbuf->tail[0]; 1235 } else { 1236 resv = &resbuf->tail[0]; 1237 } 1238 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1239 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1240 goto out_err; 1241 svc_putnl(resv, mic.len); 1242 memset(mic.data + mic.len, 0, 1243 round_up_to_quad(mic.len) - mic.len); 1244 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1245 /* not strictly required: */ 1246 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1247 BUG_ON(resv->iov_len > PAGE_SIZE); 1248 out: 1249 stat = 0; 1250 out_err: 1251 return stat; 1252 } 1253 1254 static inline int 1255 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1256 { 1257 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1258 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1259 struct xdr_buf *resbuf = &rqstp->rq_res; 1260 struct page **inpages = NULL; 1261 __be32 *p, *len; 1262 int offset; 1263 int pad; 1264 1265 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1266 if (p == NULL) 1267 return 0; 1268 len = p++; 1269 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1270 *p++ = htonl(gc->gc_seq); 1271 inpages = resbuf->pages; 1272 /* XXX: Would be better to write some xdr helper functions for 1273 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1274 if (resbuf->tail[0].iov_base) { 1275 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1276 + PAGE_SIZE); 1277 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1278 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1279 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1280 return -ENOMEM; 1281 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1282 resbuf->tail[0].iov_base, 1283 resbuf->tail[0].iov_len); 1284 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1285 } 1286 if (resbuf->tail[0].iov_base == NULL) { 1287 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1288 return -ENOMEM; 1289 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1290 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1291 resbuf->tail[0].iov_len = 0; 1292 } 1293 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1294 return -ENOMEM; 1295 *len = htonl(resbuf->len - offset); 1296 pad = 3 - ((resbuf->len - offset - 1)&3); 1297 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1298 memset(p, 0, pad); 1299 resbuf->tail[0].iov_len += pad; 1300 resbuf->len += pad; 1301 return 0; 1302 } 1303 1304 static int 1305 svcauth_gss_release(struct svc_rqst *rqstp) 1306 { 1307 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1308 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1309 struct xdr_buf *resbuf = &rqstp->rq_res; 1310 int stat = -EINVAL; 1311 1312 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1313 goto out; 1314 /* Release can be called twice, but we only wrap once. */ 1315 if (gsd->verf_start == NULL) 1316 goto out; 1317 /* normally not set till svc_send, but we need it here: */ 1318 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1319 * or whatever? */ 1320 resbuf->len = total_buf_len(resbuf); 1321 switch (gc->gc_svc) { 1322 case RPC_GSS_SVC_NONE: 1323 break; 1324 case RPC_GSS_SVC_INTEGRITY: 1325 stat = svcauth_gss_wrap_resp_integ(rqstp); 1326 if (stat) 1327 goto out_err; 1328 break; 1329 case RPC_GSS_SVC_PRIVACY: 1330 stat = svcauth_gss_wrap_resp_priv(rqstp); 1331 if (stat) 1332 goto out_err; 1333 break; 1334 default: 1335 goto out_err; 1336 } 1337 1338 out: 1339 stat = 0; 1340 out_err: 1341 if (rqstp->rq_client) 1342 auth_domain_put(rqstp->rq_client); 1343 rqstp->rq_client = NULL; 1344 if (rqstp->rq_gssclient) 1345 auth_domain_put(rqstp->rq_gssclient); 1346 rqstp->rq_gssclient = NULL; 1347 if (rqstp->rq_cred.cr_group_info) 1348 put_group_info(rqstp->rq_cred.cr_group_info); 1349 rqstp->rq_cred.cr_group_info = NULL; 1350 if (gsd->rsci) 1351 cache_put(&gsd->rsci->h, &rsc_cache); 1352 gsd->rsci = NULL; 1353 1354 return stat; 1355 } 1356 1357 static void 1358 svcauth_gss_domain_release(struct auth_domain *dom) 1359 { 1360 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1361 1362 kfree(dom->name); 1363 kfree(gd); 1364 } 1365 1366 static struct auth_ops svcauthops_gss = { 1367 .name = "rpcsec_gss", 1368 .owner = THIS_MODULE, 1369 .flavour = RPC_AUTH_GSS, 1370 .accept = svcauth_gss_accept, 1371 .release = svcauth_gss_release, 1372 .domain_release = svcauth_gss_domain_release, 1373 .set_client = svcauth_gss_set_client, 1374 }; 1375 1376 int 1377 gss_svc_init(void) 1378 { 1379 int rv = svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1380 if (rv == 0) { 1381 cache_register(&rsc_cache); 1382 cache_register(&rsi_cache); 1383 } 1384 return rv; 1385 } 1386 1387 void 1388 gss_svc_shutdown(void) 1389 { 1390 if (cache_unregister(&rsc_cache)) 1391 printk(KERN_ERR "auth_rpcgss: failed to unregister rsc cache\n"); 1392 if (cache_unregister(&rsi_cache)) 1393 printk(KERN_ERR "auth_rpcgss: failed to unregister rsi cache\n"); 1394 svc_auth_unregister(RPC_AUTH_GSS); 1395 } 1396