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, GFP_KERNEL); 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 || stat == SVC_CLOSE) 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_CLOSE; 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_CLOSE; 1030 } 1031 1032 /* Perform upcall, or find upcall result: */ 1033 rsip = rsi_lookup(&rsikey); 1034 rsi_free(&rsikey); 1035 if (!rsip) 1036 return SVC_CLOSE; 1037 if (cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 1038 /* No upcall result: */ 1039 return SVC_CLOSE; 1040 1041 ret = SVC_CLOSE; 1042 /* Got an answer to the upcall; use it: */ 1043 if (gss_write_init_verf(rqstp, rsip)) 1044 goto out; 1045 if (resv->iov_len + 4 > PAGE_SIZE) 1046 goto out; 1047 svc_putnl(resv, RPC_SUCCESS); 1048 if (svc_safe_putnetobj(resv, &rsip->out_handle)) 1049 goto out; 1050 if (resv->iov_len + 3 * 4 > PAGE_SIZE) 1051 goto out; 1052 svc_putnl(resv, rsip->major_status); 1053 svc_putnl(resv, rsip->minor_status); 1054 svc_putnl(resv, GSS_SEQ_WIN); 1055 if (svc_safe_putnetobj(resv, &rsip->out_token)) 1056 goto out; 1057 1058 ret = SVC_COMPLETE; 1059 out: 1060 cache_put(&rsip->h, &rsi_cache); 1061 return ret; 1062 } 1063 1064 /* 1065 * Accept an rpcsec packet. 1066 * If context establishment, punt to user space 1067 * If data exchange, verify/decrypt 1068 * If context destruction, handle here 1069 * In the context establishment and destruction case we encode 1070 * response here and return SVC_COMPLETE. 1071 */ 1072 static int 1073 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 1074 { 1075 struct kvec *argv = &rqstp->rq_arg.head[0]; 1076 struct kvec *resv = &rqstp->rq_res.head[0]; 1077 u32 crlen; 1078 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1079 struct rpc_gss_wire_cred *gc; 1080 struct rsc *rsci = NULL; 1081 __be32 *rpcstart; 1082 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1083 int ret; 1084 1085 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 1086 argv->iov_len); 1087 1088 *authp = rpc_autherr_badcred; 1089 if (!svcdata) 1090 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1091 if (!svcdata) 1092 goto auth_err; 1093 rqstp->rq_auth_data = svcdata; 1094 svcdata->verf_start = NULL; 1095 svcdata->rsci = NULL; 1096 gc = &svcdata->clcred; 1097 1098 /* start of rpc packet is 7 u32's back from here: 1099 * xid direction rpcversion prog vers proc flavour 1100 */ 1101 rpcstart = argv->iov_base; 1102 rpcstart -= 7; 1103 1104 /* credential is: 1105 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1106 * at least 5 u32s, and is preceeded by length, so that makes 6. 1107 */ 1108 1109 if (argv->iov_len < 5 * 4) 1110 goto auth_err; 1111 crlen = svc_getnl(argv); 1112 if (svc_getnl(argv) != RPC_GSS_VERSION) 1113 goto auth_err; 1114 gc->gc_proc = svc_getnl(argv); 1115 gc->gc_seq = svc_getnl(argv); 1116 gc->gc_svc = svc_getnl(argv); 1117 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1118 goto auth_err; 1119 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1120 goto auth_err; 1121 1122 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1123 goto auth_err; 1124 1125 *authp = rpc_autherr_badverf; 1126 switch (gc->gc_proc) { 1127 case RPC_GSS_PROC_INIT: 1128 case RPC_GSS_PROC_CONTINUE_INIT: 1129 return svcauth_gss_handle_init(rqstp, gc, authp); 1130 case RPC_GSS_PROC_DATA: 1131 case RPC_GSS_PROC_DESTROY: 1132 /* Look up the context, and check the verifier: */ 1133 *authp = rpcsec_gsserr_credproblem; 1134 rsci = gss_svc_searchbyctx(&gc->gc_ctx); 1135 if (!rsci) 1136 goto auth_err; 1137 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1138 case SVC_OK: 1139 break; 1140 case SVC_DENIED: 1141 goto auth_err; 1142 case SVC_DROP: 1143 goto drop; 1144 } 1145 break; 1146 default: 1147 *authp = rpc_autherr_rejectedcred; 1148 goto auth_err; 1149 } 1150 1151 /* now act upon the command: */ 1152 switch (gc->gc_proc) { 1153 case RPC_GSS_PROC_DESTROY: 1154 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1155 goto auth_err; 1156 rsci->h.expiry_time = get_seconds(); 1157 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1158 if (resv->iov_len + 4 > PAGE_SIZE) 1159 goto drop; 1160 svc_putnl(resv, RPC_SUCCESS); 1161 goto complete; 1162 case RPC_GSS_PROC_DATA: 1163 *authp = rpcsec_gsserr_ctxproblem; 1164 svcdata->verf_start = resv->iov_base + resv->iov_len; 1165 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1166 goto auth_err; 1167 rqstp->rq_cred = rsci->cred; 1168 get_group_info(rsci->cred.cr_group_info); 1169 *authp = rpc_autherr_badcred; 1170 switch (gc->gc_svc) { 1171 case RPC_GSS_SVC_NONE: 1172 break; 1173 case RPC_GSS_SVC_INTEGRITY: 1174 /* placeholders for length and seq. number: */ 1175 svc_putnl(resv, 0); 1176 svc_putnl(resv, 0); 1177 if (unwrap_integ_data(&rqstp->rq_arg, 1178 gc->gc_seq, rsci->mechctx)) 1179 goto garbage_args; 1180 break; 1181 case RPC_GSS_SVC_PRIVACY: 1182 /* placeholders for length and seq. number: */ 1183 svc_putnl(resv, 0); 1184 svc_putnl(resv, 0); 1185 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1186 gc->gc_seq, rsci->mechctx)) 1187 goto garbage_args; 1188 break; 1189 default: 1190 goto auth_err; 1191 } 1192 svcdata->rsci = rsci; 1193 cache_get(&rsci->h); 1194 rqstp->rq_flavor = gss_svc_to_pseudoflavor( 1195 rsci->mechctx->mech_type, gc->gc_svc); 1196 ret = SVC_OK; 1197 goto out; 1198 } 1199 garbage_args: 1200 ret = SVC_GARBAGE; 1201 goto out; 1202 auth_err: 1203 /* Restore write pointer to its original value: */ 1204 xdr_ressize_check(rqstp, reject_stat); 1205 ret = SVC_DENIED; 1206 goto out; 1207 complete: 1208 ret = SVC_COMPLETE; 1209 goto out; 1210 drop: 1211 ret = SVC_DROP; 1212 out: 1213 if (rsci) 1214 cache_put(&rsci->h, &rsc_cache); 1215 return ret; 1216 } 1217 1218 static __be32 * 1219 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1220 { 1221 __be32 *p; 1222 u32 verf_len; 1223 1224 p = gsd->verf_start; 1225 gsd->verf_start = NULL; 1226 1227 /* If the reply stat is nonzero, don't wrap: */ 1228 if (*(p-1) != rpc_success) 1229 return NULL; 1230 /* Skip the verifier: */ 1231 p += 1; 1232 verf_len = ntohl(*p++); 1233 p += XDR_QUADLEN(verf_len); 1234 /* move accept_stat to right place: */ 1235 memcpy(p, p + 2, 4); 1236 /* Also don't wrap if the accept stat is nonzero: */ 1237 if (*p != rpc_success) { 1238 resbuf->head[0].iov_len -= 2 * 4; 1239 return NULL; 1240 } 1241 p++; 1242 return p; 1243 } 1244 1245 static inline int 1246 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1247 { 1248 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1249 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1250 struct xdr_buf *resbuf = &rqstp->rq_res; 1251 struct xdr_buf integ_buf; 1252 struct xdr_netobj mic; 1253 struct kvec *resv; 1254 __be32 *p; 1255 int integ_offset, integ_len; 1256 int stat = -EINVAL; 1257 1258 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1259 if (p == NULL) 1260 goto out; 1261 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1262 integ_len = resbuf->len - integ_offset; 1263 BUG_ON(integ_len % 4); 1264 *p++ = htonl(integ_len); 1265 *p++ = htonl(gc->gc_seq); 1266 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1267 integ_len)) 1268 BUG(); 1269 if (resbuf->tail[0].iov_base == NULL) { 1270 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1271 goto out_err; 1272 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1273 + resbuf->head[0].iov_len; 1274 resbuf->tail[0].iov_len = 0; 1275 resv = &resbuf->tail[0]; 1276 } else { 1277 resv = &resbuf->tail[0]; 1278 } 1279 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1280 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1281 goto out_err; 1282 svc_putnl(resv, mic.len); 1283 memset(mic.data + mic.len, 0, 1284 round_up_to_quad(mic.len) - mic.len); 1285 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1286 /* not strictly required: */ 1287 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1288 BUG_ON(resv->iov_len > PAGE_SIZE); 1289 out: 1290 stat = 0; 1291 out_err: 1292 return stat; 1293 } 1294 1295 static inline int 1296 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1297 { 1298 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1299 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1300 struct xdr_buf *resbuf = &rqstp->rq_res; 1301 struct page **inpages = NULL; 1302 __be32 *p, *len; 1303 int offset; 1304 int pad; 1305 1306 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1307 if (p == NULL) 1308 return 0; 1309 len = p++; 1310 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1311 *p++ = htonl(gc->gc_seq); 1312 inpages = resbuf->pages; 1313 /* XXX: Would be better to write some xdr helper functions for 1314 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1315 1316 /* 1317 * If there is currently tail data, make sure there is 1318 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1319 * the page, and move the current tail data such that 1320 * there is RPC_MAX_AUTH_SIZE slack space available in 1321 * both the head and tail. 1322 */ 1323 if (resbuf->tail[0].iov_base) { 1324 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1325 + PAGE_SIZE); 1326 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1327 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1328 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1329 return -ENOMEM; 1330 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1331 resbuf->tail[0].iov_base, 1332 resbuf->tail[0].iov_len); 1333 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1334 } 1335 /* 1336 * If there is no current tail data, make sure there is 1337 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1338 * allotted page, and set up tail information such that there 1339 * is RPC_MAX_AUTH_SIZE slack space available in both the 1340 * head and tail. 1341 */ 1342 if (resbuf->tail[0].iov_base == NULL) { 1343 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1344 return -ENOMEM; 1345 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1346 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1347 resbuf->tail[0].iov_len = 0; 1348 } 1349 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1350 return -ENOMEM; 1351 *len = htonl(resbuf->len - offset); 1352 pad = 3 - ((resbuf->len - offset - 1)&3); 1353 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1354 memset(p, 0, pad); 1355 resbuf->tail[0].iov_len += pad; 1356 resbuf->len += pad; 1357 return 0; 1358 } 1359 1360 static int 1361 svcauth_gss_release(struct svc_rqst *rqstp) 1362 { 1363 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1364 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1365 struct xdr_buf *resbuf = &rqstp->rq_res; 1366 int stat = -EINVAL; 1367 1368 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1369 goto out; 1370 /* Release can be called twice, but we only wrap once. */ 1371 if (gsd->verf_start == NULL) 1372 goto out; 1373 /* normally not set till svc_send, but we need it here: */ 1374 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1375 * or whatever? */ 1376 resbuf->len = total_buf_len(resbuf); 1377 switch (gc->gc_svc) { 1378 case RPC_GSS_SVC_NONE: 1379 break; 1380 case RPC_GSS_SVC_INTEGRITY: 1381 stat = svcauth_gss_wrap_resp_integ(rqstp); 1382 if (stat) 1383 goto out_err; 1384 break; 1385 case RPC_GSS_SVC_PRIVACY: 1386 stat = svcauth_gss_wrap_resp_priv(rqstp); 1387 if (stat) 1388 goto out_err; 1389 break; 1390 /* 1391 * For any other gc_svc value, svcauth_gss_accept() already set 1392 * the auth_error appropriately; just fall through: 1393 */ 1394 } 1395 1396 out: 1397 stat = 0; 1398 out_err: 1399 if (rqstp->rq_client) 1400 auth_domain_put(rqstp->rq_client); 1401 rqstp->rq_client = NULL; 1402 if (rqstp->rq_gssclient) 1403 auth_domain_put(rqstp->rq_gssclient); 1404 rqstp->rq_gssclient = NULL; 1405 if (rqstp->rq_cred.cr_group_info) 1406 put_group_info(rqstp->rq_cred.cr_group_info); 1407 rqstp->rq_cred.cr_group_info = NULL; 1408 if (gsd->rsci) 1409 cache_put(&gsd->rsci->h, &rsc_cache); 1410 gsd->rsci = NULL; 1411 1412 return stat; 1413 } 1414 1415 static void 1416 svcauth_gss_domain_release(struct auth_domain *dom) 1417 { 1418 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1419 1420 kfree(dom->name); 1421 kfree(gd); 1422 } 1423 1424 static struct auth_ops svcauthops_gss = { 1425 .name = "rpcsec_gss", 1426 .owner = THIS_MODULE, 1427 .flavour = RPC_AUTH_GSS, 1428 .accept = svcauth_gss_accept, 1429 .release = svcauth_gss_release, 1430 .domain_release = svcauth_gss_domain_release, 1431 .set_client = svcauth_gss_set_client, 1432 }; 1433 1434 int 1435 gss_svc_init(void) 1436 { 1437 int rv = svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1438 if (rv) 1439 return rv; 1440 rv = cache_register(&rsc_cache); 1441 if (rv) 1442 goto out1; 1443 rv = cache_register(&rsi_cache); 1444 if (rv) 1445 goto out2; 1446 return 0; 1447 out2: 1448 cache_unregister(&rsc_cache); 1449 out1: 1450 svc_auth_unregister(RPC_AUTH_GSS); 1451 return rv; 1452 } 1453 1454 void 1455 gss_svc_shutdown(void) 1456 { 1457 cache_unregister(&rsc_cache); 1458 cache_unregister(&rsi_cache); 1459 svc_auth_unregister(RPC_AUTH_GSS); 1460 } 1461