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/slab.h> 41 #include <linux/types.h> 42 #include <linux/module.h> 43 #include <linux/pagemap.h> 44 45 #include <linux/sunrpc/auth_gss.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 static int rsi_upcall(struct cache_detail *cd, struct cache_head *h) 186 { 187 return sunrpc_cache_pipe_upcall(cd, h, rsi_request); 188 } 189 190 191 static int rsi_parse(struct cache_detail *cd, 192 char *mesg, int mlen) 193 { 194 /* context token expiry major minor context token */ 195 char *buf = mesg; 196 char *ep; 197 int len; 198 struct rsi rsii, *rsip = NULL; 199 time_t expiry; 200 int status = -EINVAL; 201 202 memset(&rsii, 0, sizeof(rsii)); 203 /* handle */ 204 len = qword_get(&mesg, buf, mlen); 205 if (len < 0) 206 goto out; 207 status = -ENOMEM; 208 if (dup_to_netobj(&rsii.in_handle, buf, len)) 209 goto out; 210 211 /* token */ 212 len = qword_get(&mesg, buf, mlen); 213 status = -EINVAL; 214 if (len < 0) 215 goto out; 216 status = -ENOMEM; 217 if (dup_to_netobj(&rsii.in_token, buf, len)) 218 goto out; 219 220 rsip = rsi_lookup(&rsii); 221 if (!rsip) 222 goto out; 223 224 rsii.h.flags = 0; 225 /* expiry */ 226 expiry = get_expiry(&mesg); 227 status = -EINVAL; 228 if (expiry == 0) 229 goto out; 230 231 /* major/minor */ 232 len = qword_get(&mesg, buf, mlen); 233 if (len <= 0) 234 goto out; 235 rsii.major_status = simple_strtoul(buf, &ep, 10); 236 if (*ep) 237 goto out; 238 len = qword_get(&mesg, buf, mlen); 239 if (len <= 0) 240 goto out; 241 rsii.minor_status = simple_strtoul(buf, &ep, 10); 242 if (*ep) 243 goto out; 244 245 /* out_handle */ 246 len = qword_get(&mesg, buf, mlen); 247 if (len < 0) 248 goto out; 249 status = -ENOMEM; 250 if (dup_to_netobj(&rsii.out_handle, buf, len)) 251 goto out; 252 253 /* out_token */ 254 len = qword_get(&mesg, buf, mlen); 255 status = -EINVAL; 256 if (len < 0) 257 goto out; 258 status = -ENOMEM; 259 if (dup_to_netobj(&rsii.out_token, buf, len)) 260 goto out; 261 rsii.h.expiry_time = expiry; 262 rsip = rsi_update(&rsii, rsip); 263 status = 0; 264 out: 265 rsi_free(&rsii); 266 if (rsip) 267 cache_put(&rsip->h, &rsi_cache); 268 else 269 status = -ENOMEM; 270 return status; 271 } 272 273 static struct cache_detail rsi_cache = { 274 .owner = THIS_MODULE, 275 .hash_size = RSI_HASHMAX, 276 .hash_table = rsi_table, 277 .name = "auth.rpcsec.init", 278 .cache_put = rsi_put, 279 .cache_upcall = rsi_upcall, 280 .cache_parse = rsi_parse, 281 .match = rsi_match, 282 .init = rsi_init, 283 .update = update_rsi, 284 .alloc = rsi_alloc, 285 }; 286 287 static struct rsi *rsi_lookup(struct rsi *item) 288 { 289 struct cache_head *ch; 290 int hash = rsi_hash(item); 291 292 ch = sunrpc_cache_lookup(&rsi_cache, &item->h, hash); 293 if (ch) 294 return container_of(ch, struct rsi, h); 295 else 296 return NULL; 297 } 298 299 static struct rsi *rsi_update(struct rsi *new, struct rsi *old) 300 { 301 struct cache_head *ch; 302 int hash = rsi_hash(new); 303 304 ch = sunrpc_cache_update(&rsi_cache, &new->h, 305 &old->h, hash); 306 if (ch) 307 return container_of(ch, struct rsi, h); 308 else 309 return NULL; 310 } 311 312 313 /* 314 * The rpcsec_context cache is used to store a context that is 315 * used in data exchange. 316 * The key is a context handle. The content is: 317 * uid, gidlist, mechanism, service-set, mech-specific-data 318 */ 319 320 #define RSC_HASHBITS 10 321 #define RSC_HASHMAX (1<<RSC_HASHBITS) 322 #define RSC_HASHMASK (RSC_HASHMAX-1) 323 324 #define GSS_SEQ_WIN 128 325 326 struct gss_svc_seq_data { 327 /* highest seq number seen so far: */ 328 int sd_max; 329 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 330 * sd_win is nonzero iff sequence number i has been seen already: */ 331 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 332 spinlock_t sd_lock; 333 }; 334 335 struct rsc { 336 struct cache_head h; 337 struct xdr_netobj handle; 338 struct svc_cred cred; 339 struct gss_svc_seq_data seqdata; 340 struct gss_ctx *mechctx; 341 char *client_name; 342 }; 343 344 static struct cache_head *rsc_table[RSC_HASHMAX]; 345 static struct cache_detail rsc_cache; 346 static struct rsc *rsc_update(struct rsc *new, struct rsc *old); 347 static struct rsc *rsc_lookup(struct rsc *item); 348 349 static void rsc_free(struct rsc *rsci) 350 { 351 kfree(rsci->handle.data); 352 if (rsci->mechctx) 353 gss_delete_sec_context(&rsci->mechctx); 354 if (rsci->cred.cr_group_info) 355 put_group_info(rsci->cred.cr_group_info); 356 kfree(rsci->client_name); 357 } 358 359 static void rsc_put(struct kref *ref) 360 { 361 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 362 363 rsc_free(rsci); 364 kfree(rsci); 365 } 366 367 static inline int 368 rsc_hash(struct rsc *rsci) 369 { 370 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 371 } 372 373 static int 374 rsc_match(struct cache_head *a, struct cache_head *b) 375 { 376 struct rsc *new = container_of(a, struct rsc, h); 377 struct rsc *tmp = container_of(b, struct rsc, h); 378 379 return netobj_equal(&new->handle, &tmp->handle); 380 } 381 382 static void 383 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 384 { 385 struct rsc *new = container_of(cnew, struct rsc, h); 386 struct rsc *tmp = container_of(ctmp, struct rsc, h); 387 388 new->handle.len = tmp->handle.len; 389 tmp->handle.len = 0; 390 new->handle.data = tmp->handle.data; 391 tmp->handle.data = NULL; 392 new->mechctx = NULL; 393 new->cred.cr_group_info = NULL; 394 new->client_name = NULL; 395 } 396 397 static void 398 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 399 { 400 struct rsc *new = container_of(cnew, struct rsc, h); 401 struct rsc *tmp = container_of(ctmp, struct rsc, h); 402 403 new->mechctx = tmp->mechctx; 404 tmp->mechctx = NULL; 405 memset(&new->seqdata, 0, sizeof(new->seqdata)); 406 spin_lock_init(&new->seqdata.sd_lock); 407 new->cred = tmp->cred; 408 tmp->cred.cr_group_info = NULL; 409 new->client_name = tmp->client_name; 410 tmp->client_name = NULL; 411 } 412 413 static struct cache_head * 414 rsc_alloc(void) 415 { 416 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 417 if (rsci) 418 return &rsci->h; 419 else 420 return NULL; 421 } 422 423 static int rsc_parse(struct cache_detail *cd, 424 char *mesg, int mlen) 425 { 426 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 427 char *buf = mesg; 428 int len, rv; 429 struct rsc rsci, *rscp = NULL; 430 time_t expiry; 431 int status = -EINVAL; 432 struct gss_api_mech *gm = NULL; 433 434 memset(&rsci, 0, sizeof(rsci)); 435 /* context handle */ 436 len = qword_get(&mesg, buf, mlen); 437 if (len < 0) goto out; 438 status = -ENOMEM; 439 if (dup_to_netobj(&rsci.handle, buf, len)) 440 goto out; 441 442 rsci.h.flags = 0; 443 /* expiry */ 444 expiry = get_expiry(&mesg); 445 status = -EINVAL; 446 if (expiry == 0) 447 goto out; 448 449 rscp = rsc_lookup(&rsci); 450 if (!rscp) 451 goto out; 452 453 /* uid, or NEGATIVE */ 454 rv = get_int(&mesg, &rsci.cred.cr_uid); 455 if (rv == -EINVAL) 456 goto out; 457 if (rv == -ENOENT) 458 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 459 else { 460 int N, i; 461 462 /* gid */ 463 if (get_int(&mesg, &rsci.cred.cr_gid)) 464 goto out; 465 466 /* number of additional gid's */ 467 if (get_int(&mesg, &N)) 468 goto out; 469 status = -ENOMEM; 470 rsci.cred.cr_group_info = groups_alloc(N); 471 if (rsci.cred.cr_group_info == NULL) 472 goto out; 473 474 /* gid's */ 475 status = -EINVAL; 476 for (i=0; i<N; i++) { 477 gid_t gid; 478 if (get_int(&mesg, &gid)) 479 goto out; 480 GROUP_AT(rsci.cred.cr_group_info, i) = gid; 481 } 482 483 /* mech name */ 484 len = qword_get(&mesg, buf, mlen); 485 if (len < 0) 486 goto out; 487 gm = gss_mech_get_by_name(buf); 488 status = -EOPNOTSUPP; 489 if (!gm) 490 goto out; 491 492 status = -EINVAL; 493 /* mech-specific data: */ 494 len = qword_get(&mesg, buf, mlen); 495 if (len < 0) 496 goto out; 497 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx); 498 if (status) 499 goto out; 500 501 /* get client name */ 502 len = qword_get(&mesg, buf, mlen); 503 if (len > 0) { 504 rsci.client_name = kstrdup(buf, GFP_KERNEL); 505 if (!rsci.client_name) 506 goto out; 507 } 508 509 } 510 rsci.h.expiry_time = expiry; 511 rscp = rsc_update(&rsci, rscp); 512 status = 0; 513 out: 514 gss_mech_put(gm); 515 rsc_free(&rsci); 516 if (rscp) 517 cache_put(&rscp->h, &rsc_cache); 518 else 519 status = -ENOMEM; 520 return status; 521 } 522 523 static struct cache_detail rsc_cache = { 524 .owner = THIS_MODULE, 525 .hash_size = RSC_HASHMAX, 526 .hash_table = rsc_table, 527 .name = "auth.rpcsec.context", 528 .cache_put = rsc_put, 529 .cache_parse = rsc_parse, 530 .match = rsc_match, 531 .init = rsc_init, 532 .update = update_rsc, 533 .alloc = rsc_alloc, 534 }; 535 536 static struct rsc *rsc_lookup(struct rsc *item) 537 { 538 struct cache_head *ch; 539 int hash = rsc_hash(item); 540 541 ch = sunrpc_cache_lookup(&rsc_cache, &item->h, hash); 542 if (ch) 543 return container_of(ch, struct rsc, h); 544 else 545 return NULL; 546 } 547 548 static struct rsc *rsc_update(struct rsc *new, struct rsc *old) 549 { 550 struct cache_head *ch; 551 int hash = rsc_hash(new); 552 553 ch = sunrpc_cache_update(&rsc_cache, &new->h, 554 &old->h, hash); 555 if (ch) 556 return container_of(ch, struct rsc, h); 557 else 558 return NULL; 559 } 560 561 562 static struct rsc * 563 gss_svc_searchbyctx(struct xdr_netobj *handle) 564 { 565 struct rsc rsci; 566 struct rsc *found; 567 568 memset(&rsci, 0, sizeof(rsci)); 569 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 570 return NULL; 571 found = rsc_lookup(&rsci); 572 rsc_free(&rsci); 573 if (!found) 574 return NULL; 575 if (cache_check(&rsc_cache, &found->h, NULL)) 576 return NULL; 577 return found; 578 } 579 580 /* Implements sequence number algorithm as specified in RFC 2203. */ 581 static int 582 gss_check_seq_num(struct rsc *rsci, int seq_num) 583 { 584 struct gss_svc_seq_data *sd = &rsci->seqdata; 585 586 spin_lock(&sd->sd_lock); 587 if (seq_num > sd->sd_max) { 588 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 589 memset(sd->sd_win,0,sizeof(sd->sd_win)); 590 sd->sd_max = seq_num; 591 } else while (sd->sd_max < seq_num) { 592 sd->sd_max++; 593 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 594 } 595 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 596 goto ok; 597 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 598 goto drop; 599 } 600 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 601 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 602 goto drop; 603 ok: 604 spin_unlock(&sd->sd_lock); 605 return 1; 606 drop: 607 spin_unlock(&sd->sd_lock); 608 return 0; 609 } 610 611 static inline u32 round_up_to_quad(u32 i) 612 { 613 return (i + 3 ) & ~3; 614 } 615 616 static inline int 617 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 618 { 619 int l; 620 621 if (argv->iov_len < 4) 622 return -1; 623 o->len = svc_getnl(argv); 624 l = round_up_to_quad(o->len); 625 if (argv->iov_len < l) 626 return -1; 627 o->data = argv->iov_base; 628 argv->iov_base += l; 629 argv->iov_len -= l; 630 return 0; 631 } 632 633 static inline int 634 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 635 { 636 u8 *p; 637 638 if (resv->iov_len + 4 > PAGE_SIZE) 639 return -1; 640 svc_putnl(resv, o->len); 641 p = resv->iov_base + resv->iov_len; 642 resv->iov_len += round_up_to_quad(o->len); 643 if (resv->iov_len > PAGE_SIZE) 644 return -1; 645 memcpy(p, o->data, o->len); 646 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 647 return 0; 648 } 649 650 /* 651 * Verify the checksum on the header and return SVC_OK on success. 652 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 653 * or return SVC_DENIED and indicate error in authp. 654 */ 655 static int 656 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 657 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 658 { 659 struct gss_ctx *ctx_id = rsci->mechctx; 660 struct xdr_buf rpchdr; 661 struct xdr_netobj checksum; 662 u32 flavor = 0; 663 struct kvec *argv = &rqstp->rq_arg.head[0]; 664 struct kvec iov; 665 666 /* data to compute the checksum over: */ 667 iov.iov_base = rpcstart; 668 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 669 xdr_buf_from_iov(&iov, &rpchdr); 670 671 *authp = rpc_autherr_badverf; 672 if (argv->iov_len < 4) 673 return SVC_DENIED; 674 flavor = svc_getnl(argv); 675 if (flavor != RPC_AUTH_GSS) 676 return SVC_DENIED; 677 if (svc_safe_getnetobj(argv, &checksum)) 678 return SVC_DENIED; 679 680 if (rqstp->rq_deferred) /* skip verification of revisited request */ 681 return SVC_OK; 682 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 683 *authp = rpcsec_gsserr_credproblem; 684 return SVC_DENIED; 685 } 686 687 if (gc->gc_seq > MAXSEQ) { 688 dprintk("RPC: svcauth_gss: discarding request with " 689 "large sequence number %d\n", gc->gc_seq); 690 *authp = rpcsec_gsserr_ctxproblem; 691 return SVC_DENIED; 692 } 693 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 694 dprintk("RPC: svcauth_gss: discarding request with " 695 "old sequence number %d\n", gc->gc_seq); 696 return SVC_DROP; 697 } 698 return SVC_OK; 699 } 700 701 static int 702 gss_write_null_verf(struct svc_rqst *rqstp) 703 { 704 __be32 *p; 705 706 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 707 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 708 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 709 *p++ = 0; 710 if (!xdr_ressize_check(rqstp, p)) 711 return -1; 712 return 0; 713 } 714 715 static int 716 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 717 { 718 __be32 xdr_seq; 719 u32 maj_stat; 720 struct xdr_buf verf_data; 721 struct xdr_netobj mic; 722 __be32 *p; 723 struct kvec iov; 724 725 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 726 xdr_seq = htonl(seq); 727 728 iov.iov_base = &xdr_seq; 729 iov.iov_len = sizeof(xdr_seq); 730 xdr_buf_from_iov(&iov, &verf_data); 731 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 732 mic.data = (u8 *)(p + 1); 733 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 734 if (maj_stat != GSS_S_COMPLETE) 735 return -1; 736 *p++ = htonl(mic.len); 737 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 738 p += XDR_QUADLEN(mic.len); 739 if (!xdr_ressize_check(rqstp, p)) 740 return -1; 741 return 0; 742 } 743 744 struct gss_domain { 745 struct auth_domain h; 746 u32 pseudoflavor; 747 }; 748 749 static struct auth_domain * 750 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 751 { 752 char *name; 753 754 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 755 if (!name) 756 return NULL; 757 return auth_domain_find(name); 758 } 759 760 static struct auth_ops svcauthops_gss; 761 762 u32 svcauth_gss_flavor(struct auth_domain *dom) 763 { 764 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 765 766 return gd->pseudoflavor; 767 } 768 769 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 770 771 int 772 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 773 { 774 struct gss_domain *new; 775 struct auth_domain *test; 776 int stat = -ENOMEM; 777 778 new = kmalloc(sizeof(*new), GFP_KERNEL); 779 if (!new) 780 goto out; 781 kref_init(&new->h.ref); 782 new->h.name = kstrdup(name, GFP_KERNEL); 783 if (!new->h.name) 784 goto out_free_dom; 785 new->h.flavour = &svcauthops_gss; 786 new->pseudoflavor = pseudoflavor; 787 788 stat = 0; 789 test = auth_domain_lookup(name, &new->h); 790 if (test != &new->h) { /* Duplicate registration */ 791 auth_domain_put(test); 792 kfree(new->h.name); 793 goto out_free_dom; 794 } 795 return 0; 796 797 out_free_dom: 798 kfree(new); 799 out: 800 return stat; 801 } 802 803 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 804 805 static inline int 806 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 807 { 808 __be32 raw; 809 int status; 810 811 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 812 if (status) 813 return status; 814 *obj = ntohl(raw); 815 return 0; 816 } 817 818 /* It would be nice if this bit of code could be shared with the client. 819 * Obstacles: 820 * The client shouldn't malloc(), would have to pass in own memory. 821 * The server uses base of head iovec as read pointer, while the 822 * client uses separate pointer. */ 823 static int 824 unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 825 { 826 int stat = -EINVAL; 827 u32 integ_len, maj_stat; 828 struct xdr_netobj mic; 829 struct xdr_buf integ_buf; 830 831 integ_len = svc_getnl(&buf->head[0]); 832 if (integ_len & 3) 833 return stat; 834 if (integ_len > buf->len) 835 return stat; 836 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 837 BUG(); 838 /* copy out mic... */ 839 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 840 BUG(); 841 if (mic.len > RPC_MAX_AUTH_SIZE) 842 return stat; 843 mic.data = kmalloc(mic.len, GFP_KERNEL); 844 if (!mic.data) 845 return stat; 846 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 847 goto out; 848 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 849 if (maj_stat != GSS_S_COMPLETE) 850 goto out; 851 if (svc_getnl(&buf->head[0]) != seq) 852 goto out; 853 stat = 0; 854 out: 855 kfree(mic.data); 856 return stat; 857 } 858 859 static inline int 860 total_buf_len(struct xdr_buf *buf) 861 { 862 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 863 } 864 865 static void 866 fix_priv_head(struct xdr_buf *buf, int pad) 867 { 868 if (buf->page_len == 0) { 869 /* We need to adjust head and buf->len in tandem in this 870 * case to make svc_defer() work--it finds the original 871 * buffer start using buf->len - buf->head[0].iov_len. */ 872 buf->head[0].iov_len -= pad; 873 } 874 } 875 876 static int 877 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 878 { 879 u32 priv_len, maj_stat; 880 int pad, saved_len, remaining_len, offset; 881 882 rqstp->rq_splice_ok = 0; 883 884 priv_len = svc_getnl(&buf->head[0]); 885 if (rqstp->rq_deferred) { 886 /* Already decrypted last time through! The sequence number 887 * check at out_seq is unnecessary but harmless: */ 888 goto out_seq; 889 } 890 /* buf->len is the number of bytes from the original start of the 891 * request to the end, where head[0].iov_len is just the bytes 892 * not yet read from the head, so these two values are different: */ 893 remaining_len = total_buf_len(buf); 894 if (priv_len > remaining_len) 895 return -EINVAL; 896 pad = remaining_len - priv_len; 897 buf->len -= pad; 898 fix_priv_head(buf, pad); 899 900 /* Maybe it would be better to give gss_unwrap a length parameter: */ 901 saved_len = buf->len; 902 buf->len = priv_len; 903 maj_stat = gss_unwrap(ctx, 0, buf); 904 pad = priv_len - buf->len; 905 buf->len = saved_len; 906 buf->len -= pad; 907 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 908 * In the krb5p case, at least, the data ends up offset, so we need to 909 * move it around. */ 910 /* XXX: This is very inefficient. It would be better to either do 911 * this while we encrypt, or maybe in the receive code, if we can peak 912 * ahead and work out the service and mechanism there. */ 913 offset = buf->head[0].iov_len % 4; 914 if (offset) { 915 buf->buflen = RPCSVC_MAXPAYLOAD; 916 xdr_shift_buf(buf, offset); 917 fix_priv_head(buf, pad); 918 } 919 if (maj_stat != GSS_S_COMPLETE) 920 return -EINVAL; 921 out_seq: 922 if (svc_getnl(&buf->head[0]) != seq) 923 return -EINVAL; 924 return 0; 925 } 926 927 struct gss_svc_data { 928 /* decoded gss client cred: */ 929 struct rpc_gss_wire_cred clcred; 930 /* save a pointer to the beginning of the encoded verifier, 931 * for use in encryption/checksumming in svcauth_gss_release: */ 932 __be32 *verf_start; 933 struct rsc *rsci; 934 }; 935 936 char *svc_gss_principal(struct svc_rqst *rqstp) 937 { 938 struct gss_svc_data *gd = (struct gss_svc_data *)rqstp->rq_auth_data; 939 940 if (gd && gd->rsci) 941 return gd->rsci->client_name; 942 return NULL; 943 } 944 EXPORT_SYMBOL_GPL(svc_gss_principal); 945 946 static int 947 svcauth_gss_set_client(struct svc_rqst *rqstp) 948 { 949 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 950 struct rsc *rsci = svcdata->rsci; 951 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 952 int stat; 953 954 /* 955 * A gss export can be specified either by: 956 * export *(sec=krb5,rw) 957 * or by 958 * export gss/krb5(rw) 959 * The latter is deprecated; but for backwards compatibility reasons 960 * the nfsd code will still fall back on trying it if the former 961 * doesn't work; so we try to make both available to nfsd, below. 962 */ 963 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 964 if (rqstp->rq_gssclient == NULL) 965 return SVC_DENIED; 966 stat = svcauth_unix_set_client(rqstp); 967 if (stat == SVC_DROP) 968 return stat; 969 return SVC_OK; 970 } 971 972 static inline int 973 gss_write_init_verf(struct svc_rqst *rqstp, struct rsi *rsip) 974 { 975 struct rsc *rsci; 976 int rc; 977 978 if (rsip->major_status != GSS_S_COMPLETE) 979 return gss_write_null_verf(rqstp); 980 rsci = gss_svc_searchbyctx(&rsip->out_handle); 981 if (rsci == NULL) { 982 rsip->major_status = GSS_S_NO_CONTEXT; 983 return gss_write_null_verf(rqstp); 984 } 985 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 986 cache_put(&rsci->h, &rsc_cache); 987 return rc; 988 } 989 990 /* 991 * Having read the cred already and found we're in the context 992 * initiation case, read the verifier and initiate (or check the results 993 * of) upcalls to userspace for help with context initiation. If 994 * the upcall results are available, write the verifier and result. 995 * Otherwise, drop the request pending an answer to the upcall. 996 */ 997 static int svcauth_gss_handle_init(struct svc_rqst *rqstp, 998 struct rpc_gss_wire_cred *gc, __be32 *authp) 999 { 1000 struct kvec *argv = &rqstp->rq_arg.head[0]; 1001 struct kvec *resv = &rqstp->rq_res.head[0]; 1002 struct xdr_netobj tmpobj; 1003 struct rsi *rsip, rsikey; 1004 int ret; 1005 1006 /* Read the verifier; should be NULL: */ 1007 *authp = rpc_autherr_badverf; 1008 if (argv->iov_len < 2 * 4) 1009 return SVC_DENIED; 1010 if (svc_getnl(argv) != RPC_AUTH_NULL) 1011 return SVC_DENIED; 1012 if (svc_getnl(argv) != 0) 1013 return SVC_DENIED; 1014 1015 /* Martial context handle and token for upcall: */ 1016 *authp = rpc_autherr_badcred; 1017 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 1018 return SVC_DENIED; 1019 memset(&rsikey, 0, sizeof(rsikey)); 1020 if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx)) 1021 return SVC_DROP; 1022 *authp = rpc_autherr_badverf; 1023 if (svc_safe_getnetobj(argv, &tmpobj)) { 1024 kfree(rsikey.in_handle.data); 1025 return SVC_DENIED; 1026 } 1027 if (dup_netobj(&rsikey.in_token, &tmpobj)) { 1028 kfree(rsikey.in_handle.data); 1029 return SVC_DROP; 1030 } 1031 1032 /* Perform upcall, or find upcall result: */ 1033 rsip = rsi_lookup(&rsikey); 1034 rsi_free(&rsikey); 1035 if (!rsip) 1036 return SVC_DROP; 1037 switch (cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) { 1038 case -EAGAIN: 1039 case -ETIMEDOUT: 1040 case -ENOENT: 1041 /* No upcall result: */ 1042 return SVC_DROP; 1043 case 0: 1044 ret = SVC_DROP; 1045 /* Got an answer to the upcall; use it: */ 1046 if (gss_write_init_verf(rqstp, rsip)) 1047 goto out; 1048 if (resv->iov_len + 4 > PAGE_SIZE) 1049 goto out; 1050 svc_putnl(resv, RPC_SUCCESS); 1051 if (svc_safe_putnetobj(resv, &rsip->out_handle)) 1052 goto out; 1053 if (resv->iov_len + 3 * 4 > PAGE_SIZE) 1054 goto out; 1055 svc_putnl(resv, rsip->major_status); 1056 svc_putnl(resv, rsip->minor_status); 1057 svc_putnl(resv, GSS_SEQ_WIN); 1058 if (svc_safe_putnetobj(resv, &rsip->out_token)) 1059 goto out; 1060 } 1061 ret = SVC_COMPLETE; 1062 out: 1063 cache_put(&rsip->h, &rsi_cache); 1064 return ret; 1065 } 1066 1067 /* 1068 * Accept an rpcsec packet. 1069 * If context establishment, punt to user space 1070 * If data exchange, verify/decrypt 1071 * If context destruction, handle here 1072 * In the context establishment and destruction case we encode 1073 * response here and return SVC_COMPLETE. 1074 */ 1075 static int 1076 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 1077 { 1078 struct kvec *argv = &rqstp->rq_arg.head[0]; 1079 struct kvec *resv = &rqstp->rq_res.head[0]; 1080 u32 crlen; 1081 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1082 struct rpc_gss_wire_cred *gc; 1083 struct rsc *rsci = NULL; 1084 __be32 *rpcstart; 1085 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1086 int ret; 1087 1088 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 1089 argv->iov_len); 1090 1091 *authp = rpc_autherr_badcred; 1092 if (!svcdata) 1093 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1094 if (!svcdata) 1095 goto auth_err; 1096 rqstp->rq_auth_data = svcdata; 1097 svcdata->verf_start = NULL; 1098 svcdata->rsci = NULL; 1099 gc = &svcdata->clcred; 1100 1101 /* start of rpc packet is 7 u32's back from here: 1102 * xid direction rpcversion prog vers proc flavour 1103 */ 1104 rpcstart = argv->iov_base; 1105 rpcstart -= 7; 1106 1107 /* credential is: 1108 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1109 * at least 5 u32s, and is preceeded by length, so that makes 6. 1110 */ 1111 1112 if (argv->iov_len < 5 * 4) 1113 goto auth_err; 1114 crlen = svc_getnl(argv); 1115 if (svc_getnl(argv) != RPC_GSS_VERSION) 1116 goto auth_err; 1117 gc->gc_proc = svc_getnl(argv); 1118 gc->gc_seq = svc_getnl(argv); 1119 gc->gc_svc = svc_getnl(argv); 1120 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1121 goto auth_err; 1122 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1123 goto auth_err; 1124 1125 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1126 goto auth_err; 1127 1128 *authp = rpc_autherr_badverf; 1129 switch (gc->gc_proc) { 1130 case RPC_GSS_PROC_INIT: 1131 case RPC_GSS_PROC_CONTINUE_INIT: 1132 return svcauth_gss_handle_init(rqstp, gc, authp); 1133 case RPC_GSS_PROC_DATA: 1134 case RPC_GSS_PROC_DESTROY: 1135 /* Look up the context, and check the verifier: */ 1136 *authp = rpcsec_gsserr_credproblem; 1137 rsci = gss_svc_searchbyctx(&gc->gc_ctx); 1138 if (!rsci) 1139 goto auth_err; 1140 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1141 case SVC_OK: 1142 break; 1143 case SVC_DENIED: 1144 goto auth_err; 1145 case SVC_DROP: 1146 goto drop; 1147 } 1148 break; 1149 default: 1150 *authp = rpc_autherr_rejectedcred; 1151 goto auth_err; 1152 } 1153 1154 /* now act upon the command: */ 1155 switch (gc->gc_proc) { 1156 case RPC_GSS_PROC_DESTROY: 1157 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1158 goto auth_err; 1159 rsci->h.expiry_time = get_seconds(); 1160 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1161 if (resv->iov_len + 4 > PAGE_SIZE) 1162 goto drop; 1163 svc_putnl(resv, RPC_SUCCESS); 1164 goto complete; 1165 case RPC_GSS_PROC_DATA: 1166 *authp = rpcsec_gsserr_ctxproblem; 1167 svcdata->verf_start = resv->iov_base + resv->iov_len; 1168 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1169 goto auth_err; 1170 rqstp->rq_cred = rsci->cred; 1171 get_group_info(rsci->cred.cr_group_info); 1172 *authp = rpc_autherr_badcred; 1173 switch (gc->gc_svc) { 1174 case RPC_GSS_SVC_NONE: 1175 break; 1176 case RPC_GSS_SVC_INTEGRITY: 1177 /* placeholders for length and seq. number: */ 1178 svc_putnl(resv, 0); 1179 svc_putnl(resv, 0); 1180 if (unwrap_integ_data(&rqstp->rq_arg, 1181 gc->gc_seq, rsci->mechctx)) 1182 goto garbage_args; 1183 break; 1184 case RPC_GSS_SVC_PRIVACY: 1185 /* placeholders for length and seq. number: */ 1186 svc_putnl(resv, 0); 1187 svc_putnl(resv, 0); 1188 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1189 gc->gc_seq, rsci->mechctx)) 1190 goto garbage_args; 1191 break; 1192 default: 1193 goto auth_err; 1194 } 1195 svcdata->rsci = rsci; 1196 cache_get(&rsci->h); 1197 rqstp->rq_flavor = gss_svc_to_pseudoflavor( 1198 rsci->mechctx->mech_type, gc->gc_svc); 1199 ret = SVC_OK; 1200 goto out; 1201 } 1202 garbage_args: 1203 ret = SVC_GARBAGE; 1204 goto out; 1205 auth_err: 1206 /* Restore write pointer to its original value: */ 1207 xdr_ressize_check(rqstp, reject_stat); 1208 ret = SVC_DENIED; 1209 goto out; 1210 complete: 1211 ret = SVC_COMPLETE; 1212 goto out; 1213 drop: 1214 ret = SVC_DROP; 1215 out: 1216 if (rsci) 1217 cache_put(&rsci->h, &rsc_cache); 1218 return ret; 1219 } 1220 1221 static __be32 * 1222 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1223 { 1224 __be32 *p; 1225 u32 verf_len; 1226 1227 p = gsd->verf_start; 1228 gsd->verf_start = NULL; 1229 1230 /* If the reply stat is nonzero, don't wrap: */ 1231 if (*(p-1) != rpc_success) 1232 return NULL; 1233 /* Skip the verifier: */ 1234 p += 1; 1235 verf_len = ntohl(*p++); 1236 p += XDR_QUADLEN(verf_len); 1237 /* move accept_stat to right place: */ 1238 memcpy(p, p + 2, 4); 1239 /* Also don't wrap if the accept stat is nonzero: */ 1240 if (*p != rpc_success) { 1241 resbuf->head[0].iov_len -= 2 * 4; 1242 return NULL; 1243 } 1244 p++; 1245 return p; 1246 } 1247 1248 static inline int 1249 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1250 { 1251 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1252 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1253 struct xdr_buf *resbuf = &rqstp->rq_res; 1254 struct xdr_buf integ_buf; 1255 struct xdr_netobj mic; 1256 struct kvec *resv; 1257 __be32 *p; 1258 int integ_offset, integ_len; 1259 int stat = -EINVAL; 1260 1261 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1262 if (p == NULL) 1263 goto out; 1264 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1265 integ_len = resbuf->len - integ_offset; 1266 BUG_ON(integ_len % 4); 1267 *p++ = htonl(integ_len); 1268 *p++ = htonl(gc->gc_seq); 1269 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1270 integ_len)) 1271 BUG(); 1272 if (resbuf->tail[0].iov_base == NULL) { 1273 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1274 goto out_err; 1275 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1276 + resbuf->head[0].iov_len; 1277 resbuf->tail[0].iov_len = 0; 1278 resv = &resbuf->tail[0]; 1279 } else { 1280 resv = &resbuf->tail[0]; 1281 } 1282 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1283 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1284 goto out_err; 1285 svc_putnl(resv, mic.len); 1286 memset(mic.data + mic.len, 0, 1287 round_up_to_quad(mic.len) - mic.len); 1288 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1289 /* not strictly required: */ 1290 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1291 BUG_ON(resv->iov_len > PAGE_SIZE); 1292 out: 1293 stat = 0; 1294 out_err: 1295 return stat; 1296 } 1297 1298 static inline int 1299 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1300 { 1301 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1302 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1303 struct xdr_buf *resbuf = &rqstp->rq_res; 1304 struct page **inpages = NULL; 1305 __be32 *p, *len; 1306 int offset; 1307 int pad; 1308 1309 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1310 if (p == NULL) 1311 return 0; 1312 len = p++; 1313 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1314 *p++ = htonl(gc->gc_seq); 1315 inpages = resbuf->pages; 1316 /* XXX: Would be better to write some xdr helper functions for 1317 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1318 1319 /* 1320 * If there is currently tail data, make sure there is 1321 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1322 * the page, and move the current tail data such that 1323 * there is RPC_MAX_AUTH_SIZE slack space available in 1324 * both the head and tail. 1325 */ 1326 if (resbuf->tail[0].iov_base) { 1327 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1328 + PAGE_SIZE); 1329 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1330 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1331 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1332 return -ENOMEM; 1333 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1334 resbuf->tail[0].iov_base, 1335 resbuf->tail[0].iov_len); 1336 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1337 } 1338 /* 1339 * If there is no current tail data, make sure there is 1340 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1341 * allotted page, and set up tail information such that there 1342 * is RPC_MAX_AUTH_SIZE slack space available in both the 1343 * head and tail. 1344 */ 1345 if (resbuf->tail[0].iov_base == NULL) { 1346 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1347 return -ENOMEM; 1348 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1349 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1350 resbuf->tail[0].iov_len = 0; 1351 } 1352 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1353 return -ENOMEM; 1354 *len = htonl(resbuf->len - offset); 1355 pad = 3 - ((resbuf->len - offset - 1)&3); 1356 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1357 memset(p, 0, pad); 1358 resbuf->tail[0].iov_len += pad; 1359 resbuf->len += pad; 1360 return 0; 1361 } 1362 1363 static int 1364 svcauth_gss_release(struct svc_rqst *rqstp) 1365 { 1366 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1367 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1368 struct xdr_buf *resbuf = &rqstp->rq_res; 1369 int stat = -EINVAL; 1370 1371 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1372 goto out; 1373 /* Release can be called twice, but we only wrap once. */ 1374 if (gsd->verf_start == NULL) 1375 goto out; 1376 /* normally not set till svc_send, but we need it here: */ 1377 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1378 * or whatever? */ 1379 resbuf->len = total_buf_len(resbuf); 1380 switch (gc->gc_svc) { 1381 case RPC_GSS_SVC_NONE: 1382 break; 1383 case RPC_GSS_SVC_INTEGRITY: 1384 stat = svcauth_gss_wrap_resp_integ(rqstp); 1385 if (stat) 1386 goto out_err; 1387 break; 1388 case RPC_GSS_SVC_PRIVACY: 1389 stat = svcauth_gss_wrap_resp_priv(rqstp); 1390 if (stat) 1391 goto out_err; 1392 break; 1393 /* 1394 * For any other gc_svc value, svcauth_gss_accept() already set 1395 * the auth_error appropriately; just fall through: 1396 */ 1397 } 1398 1399 out: 1400 stat = 0; 1401 out_err: 1402 if (rqstp->rq_client) 1403 auth_domain_put(rqstp->rq_client); 1404 rqstp->rq_client = NULL; 1405 if (rqstp->rq_gssclient) 1406 auth_domain_put(rqstp->rq_gssclient); 1407 rqstp->rq_gssclient = NULL; 1408 if (rqstp->rq_cred.cr_group_info) 1409 put_group_info(rqstp->rq_cred.cr_group_info); 1410 rqstp->rq_cred.cr_group_info = NULL; 1411 if (gsd->rsci) 1412 cache_put(&gsd->rsci->h, &rsc_cache); 1413 gsd->rsci = NULL; 1414 1415 return stat; 1416 } 1417 1418 static void 1419 svcauth_gss_domain_release(struct auth_domain *dom) 1420 { 1421 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1422 1423 kfree(dom->name); 1424 kfree(gd); 1425 } 1426 1427 static struct auth_ops svcauthops_gss = { 1428 .name = "rpcsec_gss", 1429 .owner = THIS_MODULE, 1430 .flavour = RPC_AUTH_GSS, 1431 .accept = svcauth_gss_accept, 1432 .release = svcauth_gss_release, 1433 .domain_release = svcauth_gss_domain_release, 1434 .set_client = svcauth_gss_set_client, 1435 }; 1436 1437 int 1438 gss_svc_init(void) 1439 { 1440 int rv = svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1441 if (rv) 1442 return rv; 1443 rv = cache_register(&rsc_cache); 1444 if (rv) 1445 goto out1; 1446 rv = cache_register(&rsi_cache); 1447 if (rv) 1448 goto out2; 1449 return 0; 1450 out2: 1451 cache_unregister(&rsc_cache); 1452 out1: 1453 svc_auth_unregister(RPC_AUTH_GSS); 1454 return rv; 1455 } 1456 1457 void 1458 gss_svc_shutdown(void) 1459 { 1460 cache_unregister(&rsc_cache); 1461 cache_unregister(&rsi_cache); 1462 svc_auth_unregister(RPC_AUTH_GSS); 1463 } 1464