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 rsii.major_status = simple_strtoul(buf, &ep, 10); 230 if (*ep) 231 goto out; 232 len = qword_get(&mesg, buf, mlen); 233 if (len <= 0) 234 goto out; 235 rsii.minor_status = simple_strtoul(buf, &ep, 10); 236 if (*ep) 237 goto out; 238 239 /* out_handle */ 240 len = qword_get(&mesg, buf, mlen); 241 if (len < 0) 242 goto out; 243 status = -ENOMEM; 244 if (dup_to_netobj(&rsii.out_handle, buf, len)) 245 goto out; 246 247 /* out_token */ 248 len = qword_get(&mesg, buf, mlen); 249 status = -EINVAL; 250 if (len < 0) 251 goto out; 252 status = -ENOMEM; 253 if (dup_to_netobj(&rsii.out_token, buf, len)) 254 goto out; 255 rsii.h.expiry_time = expiry; 256 rsip = rsi_update(&rsii, rsip); 257 status = 0; 258 out: 259 rsi_free(&rsii); 260 if (rsip) 261 cache_put(&rsip->h, &rsi_cache); 262 else 263 status = -ENOMEM; 264 return status; 265 } 266 267 static struct cache_detail rsi_cache = { 268 .owner = THIS_MODULE, 269 .hash_size = RSI_HASHMAX, 270 .hash_table = rsi_table, 271 .name = "auth.rpcsec.init", 272 .cache_put = rsi_put, 273 .cache_request = rsi_request, 274 .cache_parse = rsi_parse, 275 .match = rsi_match, 276 .init = rsi_init, 277 .update = update_rsi, 278 .alloc = rsi_alloc, 279 }; 280 281 static struct rsi *rsi_lookup(struct rsi *item) 282 { 283 struct cache_head *ch; 284 int hash = rsi_hash(item); 285 286 ch = sunrpc_cache_lookup(&rsi_cache, &item->h, hash); 287 if (ch) 288 return container_of(ch, struct rsi, h); 289 else 290 return NULL; 291 } 292 293 static struct rsi *rsi_update(struct rsi *new, struct rsi *old) 294 { 295 struct cache_head *ch; 296 int hash = rsi_hash(new); 297 298 ch = sunrpc_cache_update(&rsi_cache, &new->h, 299 &old->h, hash); 300 if (ch) 301 return container_of(ch, struct rsi, h); 302 else 303 return NULL; 304 } 305 306 307 /* 308 * The rpcsec_context cache is used to store a context that is 309 * used in data exchange. 310 * The key is a context handle. The content is: 311 * uid, gidlist, mechanism, service-set, mech-specific-data 312 */ 313 314 #define RSC_HASHBITS 10 315 #define RSC_HASHMAX (1<<RSC_HASHBITS) 316 #define RSC_HASHMASK (RSC_HASHMAX-1) 317 318 #define GSS_SEQ_WIN 128 319 320 struct gss_svc_seq_data { 321 /* highest seq number seen so far: */ 322 int sd_max; 323 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 324 * sd_win is nonzero iff sequence number i has been seen already: */ 325 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 326 spinlock_t sd_lock; 327 }; 328 329 struct rsc { 330 struct cache_head h; 331 struct xdr_netobj handle; 332 struct svc_cred cred; 333 struct gss_svc_seq_data seqdata; 334 struct gss_ctx *mechctx; 335 char *client_name; 336 }; 337 338 static struct cache_head *rsc_table[RSC_HASHMAX]; 339 static struct cache_detail rsc_cache; 340 static struct rsc *rsc_update(struct rsc *new, struct rsc *old); 341 static struct rsc *rsc_lookup(struct rsc *item); 342 343 static void rsc_free(struct rsc *rsci) 344 { 345 kfree(rsci->handle.data); 346 if (rsci->mechctx) 347 gss_delete_sec_context(&rsci->mechctx); 348 if (rsci->cred.cr_group_info) 349 put_group_info(rsci->cred.cr_group_info); 350 kfree(rsci->client_name); 351 } 352 353 static void rsc_put(struct kref *ref) 354 { 355 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 356 357 rsc_free(rsci); 358 kfree(rsci); 359 } 360 361 static inline int 362 rsc_hash(struct rsc *rsci) 363 { 364 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 365 } 366 367 static int 368 rsc_match(struct cache_head *a, struct cache_head *b) 369 { 370 struct rsc *new = container_of(a, struct rsc, h); 371 struct rsc *tmp = container_of(b, struct rsc, h); 372 373 return netobj_equal(&new->handle, &tmp->handle); 374 } 375 376 static void 377 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 378 { 379 struct rsc *new = container_of(cnew, struct rsc, h); 380 struct rsc *tmp = container_of(ctmp, struct rsc, h); 381 382 new->handle.len = tmp->handle.len; 383 tmp->handle.len = 0; 384 new->handle.data = tmp->handle.data; 385 tmp->handle.data = NULL; 386 new->mechctx = NULL; 387 new->cred.cr_group_info = NULL; 388 new->client_name = NULL; 389 } 390 391 static void 392 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 393 { 394 struct rsc *new = container_of(cnew, struct rsc, h); 395 struct rsc *tmp = container_of(ctmp, struct rsc, h); 396 397 new->mechctx = tmp->mechctx; 398 tmp->mechctx = NULL; 399 memset(&new->seqdata, 0, sizeof(new->seqdata)); 400 spin_lock_init(&new->seqdata.sd_lock); 401 new->cred = tmp->cred; 402 tmp->cred.cr_group_info = NULL; 403 new->client_name = tmp->client_name; 404 tmp->client_name = 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 /* get client name */ 496 len = qword_get(&mesg, buf, mlen); 497 if (len > 0) { 498 rsci.client_name = kstrdup(buf, GFP_KERNEL); 499 if (!rsci.client_name) 500 goto out; 501 } 502 503 } 504 rsci.h.expiry_time = expiry; 505 rscp = rsc_update(&rsci, rscp); 506 status = 0; 507 out: 508 gss_mech_put(gm); 509 rsc_free(&rsci); 510 if (rscp) 511 cache_put(&rscp->h, &rsc_cache); 512 else 513 status = -ENOMEM; 514 return status; 515 } 516 517 static struct cache_detail rsc_cache = { 518 .owner = THIS_MODULE, 519 .hash_size = RSC_HASHMAX, 520 .hash_table = rsc_table, 521 .name = "auth.rpcsec.context", 522 .cache_put = rsc_put, 523 .cache_parse = rsc_parse, 524 .match = rsc_match, 525 .init = rsc_init, 526 .update = update_rsc, 527 .alloc = rsc_alloc, 528 }; 529 530 static struct rsc *rsc_lookup(struct rsc *item) 531 { 532 struct cache_head *ch; 533 int hash = rsc_hash(item); 534 535 ch = sunrpc_cache_lookup(&rsc_cache, &item->h, hash); 536 if (ch) 537 return container_of(ch, struct rsc, h); 538 else 539 return NULL; 540 } 541 542 static struct rsc *rsc_update(struct rsc *new, struct rsc *old) 543 { 544 struct cache_head *ch; 545 int hash = rsc_hash(new); 546 547 ch = sunrpc_cache_update(&rsc_cache, &new->h, 548 &old->h, hash); 549 if (ch) 550 return container_of(ch, struct rsc, h); 551 else 552 return NULL; 553 } 554 555 556 static struct rsc * 557 gss_svc_searchbyctx(struct xdr_netobj *handle) 558 { 559 struct rsc rsci; 560 struct rsc *found; 561 562 memset(&rsci, 0, sizeof(rsci)); 563 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 564 return NULL; 565 found = rsc_lookup(&rsci); 566 rsc_free(&rsci); 567 if (!found) 568 return NULL; 569 if (cache_check(&rsc_cache, &found->h, NULL)) 570 return NULL; 571 return found; 572 } 573 574 /* Implements sequence number algorithm as specified in RFC 2203. */ 575 static int 576 gss_check_seq_num(struct rsc *rsci, int seq_num) 577 { 578 struct gss_svc_seq_data *sd = &rsci->seqdata; 579 580 spin_lock(&sd->sd_lock); 581 if (seq_num > sd->sd_max) { 582 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 583 memset(sd->sd_win,0,sizeof(sd->sd_win)); 584 sd->sd_max = seq_num; 585 } else while (sd->sd_max < seq_num) { 586 sd->sd_max++; 587 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 588 } 589 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 590 goto ok; 591 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 592 goto drop; 593 } 594 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 595 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 596 goto drop; 597 ok: 598 spin_unlock(&sd->sd_lock); 599 return 1; 600 drop: 601 spin_unlock(&sd->sd_lock); 602 return 0; 603 } 604 605 static inline u32 round_up_to_quad(u32 i) 606 { 607 return (i + 3 ) & ~3; 608 } 609 610 static inline int 611 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 612 { 613 int l; 614 615 if (argv->iov_len < 4) 616 return -1; 617 o->len = svc_getnl(argv); 618 l = round_up_to_quad(o->len); 619 if (argv->iov_len < l) 620 return -1; 621 o->data = argv->iov_base; 622 argv->iov_base += l; 623 argv->iov_len -= l; 624 return 0; 625 } 626 627 static inline int 628 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 629 { 630 u8 *p; 631 632 if (resv->iov_len + 4 > PAGE_SIZE) 633 return -1; 634 svc_putnl(resv, o->len); 635 p = resv->iov_base + resv->iov_len; 636 resv->iov_len += round_up_to_quad(o->len); 637 if (resv->iov_len > PAGE_SIZE) 638 return -1; 639 memcpy(p, o->data, o->len); 640 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 641 return 0; 642 } 643 644 /* 645 * Verify the checksum on the header and return SVC_OK on success. 646 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 647 * or return SVC_DENIED and indicate error in authp. 648 */ 649 static int 650 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 651 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 652 { 653 struct gss_ctx *ctx_id = rsci->mechctx; 654 struct xdr_buf rpchdr; 655 struct xdr_netobj checksum; 656 u32 flavor = 0; 657 struct kvec *argv = &rqstp->rq_arg.head[0]; 658 struct kvec iov; 659 660 /* data to compute the checksum over: */ 661 iov.iov_base = rpcstart; 662 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 663 xdr_buf_from_iov(&iov, &rpchdr); 664 665 *authp = rpc_autherr_badverf; 666 if (argv->iov_len < 4) 667 return SVC_DENIED; 668 flavor = svc_getnl(argv); 669 if (flavor != RPC_AUTH_GSS) 670 return SVC_DENIED; 671 if (svc_safe_getnetobj(argv, &checksum)) 672 return SVC_DENIED; 673 674 if (rqstp->rq_deferred) /* skip verification of revisited request */ 675 return SVC_OK; 676 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 677 *authp = rpcsec_gsserr_credproblem; 678 return SVC_DENIED; 679 } 680 681 if (gc->gc_seq > MAXSEQ) { 682 dprintk("RPC: svcauth_gss: discarding request with " 683 "large sequence number %d\n", gc->gc_seq); 684 *authp = rpcsec_gsserr_ctxproblem; 685 return SVC_DENIED; 686 } 687 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 688 dprintk("RPC: svcauth_gss: discarding request with " 689 "old sequence number %d\n", gc->gc_seq); 690 return SVC_DROP; 691 } 692 return SVC_OK; 693 } 694 695 static int 696 gss_write_null_verf(struct svc_rqst *rqstp) 697 { 698 __be32 *p; 699 700 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 701 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 702 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 703 *p++ = 0; 704 if (!xdr_ressize_check(rqstp, p)) 705 return -1; 706 return 0; 707 } 708 709 static int 710 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 711 { 712 __be32 xdr_seq; 713 u32 maj_stat; 714 struct xdr_buf verf_data; 715 struct xdr_netobj mic; 716 __be32 *p; 717 struct kvec iov; 718 719 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 720 xdr_seq = htonl(seq); 721 722 iov.iov_base = &xdr_seq; 723 iov.iov_len = sizeof(xdr_seq); 724 xdr_buf_from_iov(&iov, &verf_data); 725 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 726 mic.data = (u8 *)(p + 1); 727 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 728 if (maj_stat != GSS_S_COMPLETE) 729 return -1; 730 *p++ = htonl(mic.len); 731 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 732 p += XDR_QUADLEN(mic.len); 733 if (!xdr_ressize_check(rqstp, p)) 734 return -1; 735 return 0; 736 } 737 738 struct gss_domain { 739 struct auth_domain h; 740 u32 pseudoflavor; 741 }; 742 743 static struct auth_domain * 744 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 745 { 746 char *name; 747 748 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 749 if (!name) 750 return NULL; 751 return auth_domain_find(name); 752 } 753 754 static struct auth_ops svcauthops_gss; 755 756 u32 svcauth_gss_flavor(struct auth_domain *dom) 757 { 758 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 759 760 return gd->pseudoflavor; 761 } 762 763 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 764 765 int 766 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 767 { 768 struct gss_domain *new; 769 struct auth_domain *test; 770 int stat = -ENOMEM; 771 772 new = kmalloc(sizeof(*new), GFP_KERNEL); 773 if (!new) 774 goto out; 775 kref_init(&new->h.ref); 776 new->h.name = kstrdup(name, GFP_KERNEL); 777 if (!new->h.name) 778 goto out_free_dom; 779 new->h.flavour = &svcauthops_gss; 780 new->pseudoflavor = pseudoflavor; 781 782 stat = 0; 783 test = auth_domain_lookup(name, &new->h); 784 if (test != &new->h) { /* Duplicate registration */ 785 auth_domain_put(test); 786 kfree(new->h.name); 787 goto out_free_dom; 788 } 789 return 0; 790 791 out_free_dom: 792 kfree(new); 793 out: 794 return stat; 795 } 796 797 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 798 799 static inline int 800 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 801 { 802 __be32 raw; 803 int status; 804 805 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 806 if (status) 807 return status; 808 *obj = ntohl(raw); 809 return 0; 810 } 811 812 /* It would be nice if this bit of code could be shared with the client. 813 * Obstacles: 814 * The client shouldn't malloc(), would have to pass in own memory. 815 * The server uses base of head iovec as read pointer, while the 816 * client uses separate pointer. */ 817 static int 818 unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 819 { 820 int stat = -EINVAL; 821 u32 integ_len, maj_stat; 822 struct xdr_netobj mic; 823 struct xdr_buf integ_buf; 824 825 integ_len = svc_getnl(&buf->head[0]); 826 if (integ_len & 3) 827 return stat; 828 if (integ_len > buf->len) 829 return stat; 830 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 831 BUG(); 832 /* copy out mic... */ 833 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 834 BUG(); 835 if (mic.len > RPC_MAX_AUTH_SIZE) 836 return stat; 837 mic.data = kmalloc(mic.len, GFP_KERNEL); 838 if (!mic.data) 839 return stat; 840 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 841 goto out; 842 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 843 if (maj_stat != GSS_S_COMPLETE) 844 goto out; 845 if (svc_getnl(&buf->head[0]) != seq) 846 goto out; 847 stat = 0; 848 out: 849 kfree(mic.data); 850 return stat; 851 } 852 853 static inline int 854 total_buf_len(struct xdr_buf *buf) 855 { 856 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 857 } 858 859 static void 860 fix_priv_head(struct xdr_buf *buf, int pad) 861 { 862 if (buf->page_len == 0) { 863 /* We need to adjust head and buf->len in tandem in this 864 * case to make svc_defer() work--it finds the original 865 * buffer start using buf->len - buf->head[0].iov_len. */ 866 buf->head[0].iov_len -= pad; 867 } 868 } 869 870 static int 871 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 872 { 873 u32 priv_len, maj_stat; 874 int pad, saved_len, remaining_len, offset; 875 876 rqstp->rq_splice_ok = 0; 877 878 priv_len = svc_getnl(&buf->head[0]); 879 if (rqstp->rq_deferred) { 880 /* Already decrypted last time through! The sequence number 881 * check at out_seq is unnecessary but harmless: */ 882 goto out_seq; 883 } 884 /* buf->len is the number of bytes from the original start of the 885 * request to the end, where head[0].iov_len is just the bytes 886 * not yet read from the head, so these two values are different: */ 887 remaining_len = total_buf_len(buf); 888 if (priv_len > remaining_len) 889 return -EINVAL; 890 pad = remaining_len - priv_len; 891 buf->len -= pad; 892 fix_priv_head(buf, pad); 893 894 /* Maybe it would be better to give gss_unwrap a length parameter: */ 895 saved_len = buf->len; 896 buf->len = priv_len; 897 maj_stat = gss_unwrap(ctx, 0, buf); 898 pad = priv_len - buf->len; 899 buf->len = saved_len; 900 buf->len -= pad; 901 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 902 * In the krb5p case, at least, the data ends up offset, so we need to 903 * move it around. */ 904 /* XXX: This is very inefficient. It would be better to either do 905 * this while we encrypt, or maybe in the receive code, if we can peak 906 * ahead and work out the service and mechanism there. */ 907 offset = buf->head[0].iov_len % 4; 908 if (offset) { 909 buf->buflen = RPCSVC_MAXPAYLOAD; 910 xdr_shift_buf(buf, offset); 911 fix_priv_head(buf, pad); 912 } 913 if (maj_stat != GSS_S_COMPLETE) 914 return -EINVAL; 915 out_seq: 916 if (svc_getnl(&buf->head[0]) != seq) 917 return -EINVAL; 918 return 0; 919 } 920 921 struct gss_svc_data { 922 /* decoded gss client cred: */ 923 struct rpc_gss_wire_cred clcred; 924 /* save a pointer to the beginning of the encoded verifier, 925 * for use in encryption/checksumming in svcauth_gss_release: */ 926 __be32 *verf_start; 927 struct rsc *rsci; 928 }; 929 930 char *svc_gss_principal(struct svc_rqst *rqstp) 931 { 932 struct gss_svc_data *gd = (struct gss_svc_data *)rqstp->rq_auth_data; 933 934 if (gd && gd->rsci) 935 return gd->rsci->client_name; 936 return NULL; 937 } 938 EXPORT_SYMBOL_GPL(svc_gss_principal); 939 940 static int 941 svcauth_gss_set_client(struct svc_rqst *rqstp) 942 { 943 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 944 struct rsc *rsci = svcdata->rsci; 945 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 946 int stat; 947 948 /* 949 * A gss export can be specified either by: 950 * export *(sec=krb5,rw) 951 * or by 952 * export gss/krb5(rw) 953 * The latter is deprecated; but for backwards compatibility reasons 954 * the nfsd code will still fall back on trying it if the former 955 * doesn't work; so we try to make both available to nfsd, below. 956 */ 957 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 958 if (rqstp->rq_gssclient == NULL) 959 return SVC_DENIED; 960 stat = svcauth_unix_set_client(rqstp); 961 if (stat == SVC_DROP) 962 return stat; 963 return SVC_OK; 964 } 965 966 static inline int 967 gss_write_init_verf(struct svc_rqst *rqstp, struct rsi *rsip) 968 { 969 struct rsc *rsci; 970 int rc; 971 972 if (rsip->major_status != GSS_S_COMPLETE) 973 return gss_write_null_verf(rqstp); 974 rsci = gss_svc_searchbyctx(&rsip->out_handle); 975 if (rsci == NULL) { 976 rsip->major_status = GSS_S_NO_CONTEXT; 977 return gss_write_null_verf(rqstp); 978 } 979 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 980 cache_put(&rsci->h, &rsc_cache); 981 return rc; 982 } 983 984 /* 985 * Having read the cred already and found we're in the context 986 * initiation case, read the verifier and initiate (or check the results 987 * of) upcalls to userspace for help with context initiation. If 988 * the upcall results are available, write the verifier and result. 989 * Otherwise, drop the request pending an answer to the upcall. 990 */ 991 static int svcauth_gss_handle_init(struct svc_rqst *rqstp, 992 struct rpc_gss_wire_cred *gc, __be32 *authp) 993 { 994 struct kvec *argv = &rqstp->rq_arg.head[0]; 995 struct kvec *resv = &rqstp->rq_res.head[0]; 996 struct xdr_netobj tmpobj; 997 struct rsi *rsip, rsikey; 998 int ret; 999 1000 /* Read the verifier; should be NULL: */ 1001 *authp = rpc_autherr_badverf; 1002 if (argv->iov_len < 2 * 4) 1003 return SVC_DENIED; 1004 if (svc_getnl(argv) != RPC_AUTH_NULL) 1005 return SVC_DENIED; 1006 if (svc_getnl(argv) != 0) 1007 return SVC_DENIED; 1008 1009 /* Martial context handle and token for upcall: */ 1010 *authp = rpc_autherr_badcred; 1011 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 1012 return SVC_DENIED; 1013 memset(&rsikey, 0, sizeof(rsikey)); 1014 if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) 1015 return SVC_DROP; 1016 *authp = rpc_autherr_badverf; 1017 if (svc_safe_getnetobj(argv, &tmpobj)) { 1018 kfree(rsikey.in_handle.data); 1019 return SVC_DENIED; 1020 } 1021 if (dup_netobj(&rsikey.in_token, &tmpobj)) { 1022 kfree(rsikey.in_handle.data); 1023 return SVC_DROP; 1024 } 1025 1026 /* Perform upcall, or find upcall result: */ 1027 rsip = rsi_lookup(&rsikey); 1028 rsi_free(&rsikey); 1029 if (!rsip) 1030 return SVC_DROP; 1031 switch (cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) { 1032 case -EAGAIN: 1033 case -ETIMEDOUT: 1034 case -ENOENT: 1035 /* No upcall result: */ 1036 return SVC_DROP; 1037 case 0: 1038 ret = SVC_DROP; 1039 /* Got an answer to the upcall; use it: */ 1040 if (gss_write_init_verf(rqstp, rsip)) 1041 goto out; 1042 if (resv->iov_len + 4 > PAGE_SIZE) 1043 goto out; 1044 svc_putnl(resv, RPC_SUCCESS); 1045 if (svc_safe_putnetobj(resv, &rsip->out_handle)) 1046 goto out; 1047 if (resv->iov_len + 3 * 4 > PAGE_SIZE) 1048 goto out; 1049 svc_putnl(resv, rsip->major_status); 1050 svc_putnl(resv, rsip->minor_status); 1051 svc_putnl(resv, GSS_SEQ_WIN); 1052 if (svc_safe_putnetobj(resv, &rsip->out_token)) 1053 goto out; 1054 } 1055 ret = SVC_COMPLETE; 1056 out: 1057 cache_put(&rsip->h, &rsi_cache); 1058 return ret; 1059 } 1060 1061 /* 1062 * Accept an rpcsec packet. 1063 * If context establishment, punt to user space 1064 * If data exchange, verify/decrypt 1065 * If context destruction, handle here 1066 * In the context establishment and destruction case we encode 1067 * response here and return SVC_COMPLETE. 1068 */ 1069 static int 1070 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 1071 { 1072 struct kvec *argv = &rqstp->rq_arg.head[0]; 1073 struct kvec *resv = &rqstp->rq_res.head[0]; 1074 u32 crlen; 1075 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1076 struct rpc_gss_wire_cred *gc; 1077 struct rsc *rsci = NULL; 1078 __be32 *rpcstart; 1079 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1080 int ret; 1081 1082 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 1083 argv->iov_len); 1084 1085 *authp = rpc_autherr_badcred; 1086 if (!svcdata) 1087 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1088 if (!svcdata) 1089 goto auth_err; 1090 rqstp->rq_auth_data = svcdata; 1091 svcdata->verf_start = NULL; 1092 svcdata->rsci = NULL; 1093 gc = &svcdata->clcred; 1094 1095 /* start of rpc packet is 7 u32's back from here: 1096 * xid direction rpcversion prog vers proc flavour 1097 */ 1098 rpcstart = argv->iov_base; 1099 rpcstart -= 7; 1100 1101 /* credential is: 1102 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1103 * at least 5 u32s, and is preceeded by length, so that makes 6. 1104 */ 1105 1106 if (argv->iov_len < 5 * 4) 1107 goto auth_err; 1108 crlen = svc_getnl(argv); 1109 if (svc_getnl(argv) != RPC_GSS_VERSION) 1110 goto auth_err; 1111 gc->gc_proc = svc_getnl(argv); 1112 gc->gc_seq = svc_getnl(argv); 1113 gc->gc_svc = svc_getnl(argv); 1114 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1115 goto auth_err; 1116 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1117 goto auth_err; 1118 1119 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1120 goto auth_err; 1121 1122 *authp = rpc_autherr_badverf; 1123 switch (gc->gc_proc) { 1124 case RPC_GSS_PROC_INIT: 1125 case RPC_GSS_PROC_CONTINUE_INIT: 1126 return svcauth_gss_handle_init(rqstp, gc, authp); 1127 case RPC_GSS_PROC_DATA: 1128 case RPC_GSS_PROC_DESTROY: 1129 /* Look up the context, and check the verifier: */ 1130 *authp = rpcsec_gsserr_credproblem; 1131 rsci = gss_svc_searchbyctx(&gc->gc_ctx); 1132 if (!rsci) 1133 goto auth_err; 1134 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1135 case SVC_OK: 1136 break; 1137 case SVC_DENIED: 1138 goto auth_err; 1139 case SVC_DROP: 1140 goto drop; 1141 } 1142 break; 1143 default: 1144 *authp = rpc_autherr_rejectedcred; 1145 goto auth_err; 1146 } 1147 1148 /* now act upon the command: */ 1149 switch (gc->gc_proc) { 1150 case RPC_GSS_PROC_DESTROY: 1151 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1152 goto auth_err; 1153 rsci->h.expiry_time = get_seconds(); 1154 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1155 if (resv->iov_len + 4 > PAGE_SIZE) 1156 goto drop; 1157 svc_putnl(resv, RPC_SUCCESS); 1158 goto complete; 1159 case RPC_GSS_PROC_DATA: 1160 *authp = rpcsec_gsserr_ctxproblem; 1161 svcdata->verf_start = resv->iov_base + resv->iov_len; 1162 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1163 goto auth_err; 1164 rqstp->rq_cred = rsci->cred; 1165 get_group_info(rsci->cred.cr_group_info); 1166 *authp = rpc_autherr_badcred; 1167 switch (gc->gc_svc) { 1168 case RPC_GSS_SVC_NONE: 1169 break; 1170 case RPC_GSS_SVC_INTEGRITY: 1171 /* placeholders for length and seq. number: */ 1172 svc_putnl(resv, 0); 1173 svc_putnl(resv, 0); 1174 if (unwrap_integ_data(&rqstp->rq_arg, 1175 gc->gc_seq, rsci->mechctx)) 1176 goto garbage_args; 1177 break; 1178 case RPC_GSS_SVC_PRIVACY: 1179 /* placeholders for length and seq. number: */ 1180 svc_putnl(resv, 0); 1181 svc_putnl(resv, 0); 1182 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1183 gc->gc_seq, rsci->mechctx)) 1184 goto garbage_args; 1185 break; 1186 default: 1187 goto auth_err; 1188 } 1189 svcdata->rsci = rsci; 1190 cache_get(&rsci->h); 1191 rqstp->rq_flavor = gss_svc_to_pseudoflavor( 1192 rsci->mechctx->mech_type, gc->gc_svc); 1193 ret = SVC_OK; 1194 goto out; 1195 } 1196 garbage_args: 1197 ret = SVC_GARBAGE; 1198 goto out; 1199 auth_err: 1200 /* Restore write pointer to its original value: */ 1201 xdr_ressize_check(rqstp, reject_stat); 1202 ret = SVC_DENIED; 1203 goto out; 1204 complete: 1205 ret = SVC_COMPLETE; 1206 goto out; 1207 drop: 1208 ret = SVC_DROP; 1209 out: 1210 if (rsci) 1211 cache_put(&rsci->h, &rsc_cache); 1212 return ret; 1213 } 1214 1215 static __be32 * 1216 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1217 { 1218 __be32 *p; 1219 u32 verf_len; 1220 1221 p = gsd->verf_start; 1222 gsd->verf_start = NULL; 1223 1224 /* If the reply stat is nonzero, don't wrap: */ 1225 if (*(p-1) != rpc_success) 1226 return NULL; 1227 /* Skip the verifier: */ 1228 p += 1; 1229 verf_len = ntohl(*p++); 1230 p += XDR_QUADLEN(verf_len); 1231 /* move accept_stat to right place: */ 1232 memcpy(p, p + 2, 4); 1233 /* Also don't wrap if the accept stat is nonzero: */ 1234 if (*p != rpc_success) { 1235 resbuf->head[0].iov_len -= 2 * 4; 1236 return NULL; 1237 } 1238 p++; 1239 return p; 1240 } 1241 1242 static inline int 1243 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1244 { 1245 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1246 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1247 struct xdr_buf *resbuf = &rqstp->rq_res; 1248 struct xdr_buf integ_buf; 1249 struct xdr_netobj mic; 1250 struct kvec *resv; 1251 __be32 *p; 1252 int integ_offset, integ_len; 1253 int stat = -EINVAL; 1254 1255 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1256 if (p == NULL) 1257 goto out; 1258 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1259 integ_len = resbuf->len - integ_offset; 1260 BUG_ON(integ_len % 4); 1261 *p++ = htonl(integ_len); 1262 *p++ = htonl(gc->gc_seq); 1263 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1264 integ_len)) 1265 BUG(); 1266 if (resbuf->tail[0].iov_base == NULL) { 1267 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1268 goto out_err; 1269 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1270 + resbuf->head[0].iov_len; 1271 resbuf->tail[0].iov_len = 0; 1272 resv = &resbuf->tail[0]; 1273 } else { 1274 resv = &resbuf->tail[0]; 1275 } 1276 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1277 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1278 goto out_err; 1279 svc_putnl(resv, mic.len); 1280 memset(mic.data + mic.len, 0, 1281 round_up_to_quad(mic.len) - mic.len); 1282 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1283 /* not strictly required: */ 1284 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1285 BUG_ON(resv->iov_len > PAGE_SIZE); 1286 out: 1287 stat = 0; 1288 out_err: 1289 return stat; 1290 } 1291 1292 static inline int 1293 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1294 { 1295 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1296 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1297 struct xdr_buf *resbuf = &rqstp->rq_res; 1298 struct page **inpages = NULL; 1299 __be32 *p, *len; 1300 int offset; 1301 int pad; 1302 1303 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1304 if (p == NULL) 1305 return 0; 1306 len = p++; 1307 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1308 *p++ = htonl(gc->gc_seq); 1309 inpages = resbuf->pages; 1310 /* XXX: Would be better to write some xdr helper functions for 1311 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1312 if (resbuf->tail[0].iov_base) { 1313 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1314 + PAGE_SIZE); 1315 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1316 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1317 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1318 return -ENOMEM; 1319 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1320 resbuf->tail[0].iov_base, 1321 resbuf->tail[0].iov_len); 1322 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1323 } 1324 if (resbuf->tail[0].iov_base == NULL) { 1325 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1326 return -ENOMEM; 1327 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1328 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1329 resbuf->tail[0].iov_len = 0; 1330 } 1331 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1332 return -ENOMEM; 1333 *len = htonl(resbuf->len - offset); 1334 pad = 3 - ((resbuf->len - offset - 1)&3); 1335 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1336 memset(p, 0, pad); 1337 resbuf->tail[0].iov_len += pad; 1338 resbuf->len += pad; 1339 return 0; 1340 } 1341 1342 static int 1343 svcauth_gss_release(struct svc_rqst *rqstp) 1344 { 1345 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1346 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1347 struct xdr_buf *resbuf = &rqstp->rq_res; 1348 int stat = -EINVAL; 1349 1350 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1351 goto out; 1352 /* Release can be called twice, but we only wrap once. */ 1353 if (gsd->verf_start == NULL) 1354 goto out; 1355 /* normally not set till svc_send, but we need it here: */ 1356 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1357 * or whatever? */ 1358 resbuf->len = total_buf_len(resbuf); 1359 switch (gc->gc_svc) { 1360 case RPC_GSS_SVC_NONE: 1361 break; 1362 case RPC_GSS_SVC_INTEGRITY: 1363 stat = svcauth_gss_wrap_resp_integ(rqstp); 1364 if (stat) 1365 goto out_err; 1366 break; 1367 case RPC_GSS_SVC_PRIVACY: 1368 stat = svcauth_gss_wrap_resp_priv(rqstp); 1369 if (stat) 1370 goto out_err; 1371 break; 1372 default: 1373 goto out_err; 1374 } 1375 1376 out: 1377 stat = 0; 1378 out_err: 1379 if (rqstp->rq_client) 1380 auth_domain_put(rqstp->rq_client); 1381 rqstp->rq_client = NULL; 1382 if (rqstp->rq_gssclient) 1383 auth_domain_put(rqstp->rq_gssclient); 1384 rqstp->rq_gssclient = NULL; 1385 if (rqstp->rq_cred.cr_group_info) 1386 put_group_info(rqstp->rq_cred.cr_group_info); 1387 rqstp->rq_cred.cr_group_info = NULL; 1388 if (gsd->rsci) 1389 cache_put(&gsd->rsci->h, &rsc_cache); 1390 gsd->rsci = NULL; 1391 1392 return stat; 1393 } 1394 1395 static void 1396 svcauth_gss_domain_release(struct auth_domain *dom) 1397 { 1398 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1399 1400 kfree(dom->name); 1401 kfree(gd); 1402 } 1403 1404 static struct auth_ops svcauthops_gss = { 1405 .name = "rpcsec_gss", 1406 .owner = THIS_MODULE, 1407 .flavour = RPC_AUTH_GSS, 1408 .accept = svcauth_gss_accept, 1409 .release = svcauth_gss_release, 1410 .domain_release = svcauth_gss_domain_release, 1411 .set_client = svcauth_gss_set_client, 1412 }; 1413 1414 int 1415 gss_svc_init(void) 1416 { 1417 int rv = svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1418 if (rv) 1419 return rv; 1420 rv = cache_register(&rsc_cache); 1421 if (rv) 1422 goto out1; 1423 rv = cache_register(&rsi_cache); 1424 if (rv) 1425 goto out2; 1426 return 0; 1427 out2: 1428 cache_unregister(&rsc_cache); 1429 out1: 1430 svc_auth_unregister(RPC_AUTH_GSS); 1431 return rv; 1432 } 1433 1434 void 1435 gss_svc_shutdown(void) 1436 { 1437 cache_unregister(&rsc_cache); 1438 cache_unregister(&rsi_cache); 1439 svc_auth_unregister(RPC_AUTH_GSS); 1440 } 1441