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 #include "../netns.h" 52 53 #ifdef RPC_DEBUG 54 # define RPCDBG_FACILITY RPCDBG_AUTH 55 #endif 56 57 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests 58 * into replies. 59 * 60 * Key is context handle (\x if empty) and gss_token. 61 * Content is major_status minor_status (integers) context_handle, reply_token. 62 * 63 */ 64 65 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) 66 { 67 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); 68 } 69 70 #define RSI_HASHBITS 6 71 #define RSI_HASHMAX (1<<RSI_HASHBITS) 72 73 struct rsi { 74 struct cache_head h; 75 struct xdr_netobj in_handle, in_token; 76 struct xdr_netobj out_handle, out_token; 77 int major_status, minor_status; 78 }; 79 80 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old); 81 static struct rsi *rsi_lookup(struct cache_detail *cd, 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 static int rsi_upcall(struct cache_detail *cd, struct cache_head *h) 185 { 186 return sunrpc_cache_pipe_upcall(cd, h, rsi_request); 187 } 188 189 190 static int rsi_parse(struct cache_detail *cd, 191 char *mesg, int mlen) 192 { 193 /* context token expiry major minor context token */ 194 char *buf = mesg; 195 char *ep; 196 int len; 197 struct rsi rsii, *rsip = NULL; 198 time_t expiry; 199 int status = -EINVAL; 200 201 memset(&rsii, 0, sizeof(rsii)); 202 /* handle */ 203 len = qword_get(&mesg, buf, mlen); 204 if (len < 0) 205 goto out; 206 status = -ENOMEM; 207 if (dup_to_netobj(&rsii.in_handle, buf, len)) 208 goto out; 209 210 /* token */ 211 len = qword_get(&mesg, buf, mlen); 212 status = -EINVAL; 213 if (len < 0) 214 goto out; 215 status = -ENOMEM; 216 if (dup_to_netobj(&rsii.in_token, buf, len)) 217 goto out; 218 219 rsip = rsi_lookup(cd, &rsii); 220 if (!rsip) 221 goto out; 222 223 rsii.h.flags = 0; 224 /* expiry */ 225 expiry = get_expiry(&mesg); 226 status = -EINVAL; 227 if (expiry == 0) 228 goto out; 229 230 /* major/minor */ 231 len = qword_get(&mesg, buf, mlen); 232 if (len <= 0) 233 goto out; 234 rsii.major_status = simple_strtoul(buf, &ep, 10); 235 if (*ep) 236 goto out; 237 len = qword_get(&mesg, buf, mlen); 238 if (len <= 0) 239 goto out; 240 rsii.minor_status = simple_strtoul(buf, &ep, 10); 241 if (*ep) 242 goto out; 243 244 /* out_handle */ 245 len = qword_get(&mesg, buf, mlen); 246 if (len < 0) 247 goto out; 248 status = -ENOMEM; 249 if (dup_to_netobj(&rsii.out_handle, buf, len)) 250 goto out; 251 252 /* out_token */ 253 len = qword_get(&mesg, buf, mlen); 254 status = -EINVAL; 255 if (len < 0) 256 goto out; 257 status = -ENOMEM; 258 if (dup_to_netobj(&rsii.out_token, buf, len)) 259 goto out; 260 rsii.h.expiry_time = expiry; 261 rsip = rsi_update(cd, &rsii, rsip); 262 status = 0; 263 out: 264 rsi_free(&rsii); 265 if (rsip) 266 cache_put(&rsip->h, cd); 267 else 268 status = -ENOMEM; 269 return status; 270 } 271 272 static struct cache_detail rsi_cache_template = { 273 .owner = THIS_MODULE, 274 .hash_size = RSI_HASHMAX, 275 .name = "auth.rpcsec.init", 276 .cache_put = rsi_put, 277 .cache_upcall = rsi_upcall, 278 .cache_parse = rsi_parse, 279 .match = rsi_match, 280 .init = rsi_init, 281 .update = update_rsi, 282 .alloc = rsi_alloc, 283 }; 284 285 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item) 286 { 287 struct cache_head *ch; 288 int hash = rsi_hash(item); 289 290 ch = sunrpc_cache_lookup(cd, &item->h, hash); 291 if (ch) 292 return container_of(ch, struct rsi, h); 293 else 294 return NULL; 295 } 296 297 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old) 298 { 299 struct cache_head *ch; 300 int hash = rsi_hash(new); 301 302 ch = sunrpc_cache_update(cd, &new->h, 303 &old->h, hash); 304 if (ch) 305 return container_of(ch, struct rsi, h); 306 else 307 return NULL; 308 } 309 310 311 /* 312 * The rpcsec_context cache is used to store a context that is 313 * used in data exchange. 314 * The key is a context handle. The content is: 315 * uid, gidlist, mechanism, service-set, mech-specific-data 316 */ 317 318 #define RSC_HASHBITS 10 319 #define RSC_HASHMAX (1<<RSC_HASHBITS) 320 321 #define GSS_SEQ_WIN 128 322 323 struct gss_svc_seq_data { 324 /* highest seq number seen so far: */ 325 int sd_max; 326 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 327 * sd_win is nonzero iff sequence number i has been seen already: */ 328 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 329 spinlock_t sd_lock; 330 }; 331 332 struct rsc { 333 struct cache_head h; 334 struct xdr_netobj handle; 335 struct svc_cred cred; 336 struct gss_svc_seq_data seqdata; 337 struct gss_ctx *mechctx; 338 }; 339 340 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old); 341 static struct rsc *rsc_lookup(struct cache_detail *cd, 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 free_svc_cred(&rsci->cred); 349 } 350 351 static void rsc_put(struct kref *ref) 352 { 353 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 354 355 rsc_free(rsci); 356 kfree(rsci); 357 } 358 359 static inline int 360 rsc_hash(struct rsc *rsci) 361 { 362 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 363 } 364 365 static int 366 rsc_match(struct cache_head *a, struct cache_head *b) 367 { 368 struct rsc *new = container_of(a, struct rsc, h); 369 struct rsc *tmp = container_of(b, struct rsc, h); 370 371 return netobj_equal(&new->handle, &tmp->handle); 372 } 373 374 static void 375 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 376 { 377 struct rsc *new = container_of(cnew, struct rsc, h); 378 struct rsc *tmp = container_of(ctmp, struct rsc, h); 379 380 new->handle.len = tmp->handle.len; 381 tmp->handle.len = 0; 382 new->handle.data = tmp->handle.data; 383 tmp->handle.data = NULL; 384 new->mechctx = NULL; 385 new->cred.cr_group_info = NULL; 386 new->cred.cr_principal = NULL; 387 } 388 389 static void 390 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 391 { 392 struct rsc *new = container_of(cnew, struct rsc, h); 393 struct rsc *tmp = container_of(ctmp, struct rsc, h); 394 395 new->mechctx = tmp->mechctx; 396 tmp->mechctx = NULL; 397 memset(&new->seqdata, 0, sizeof(new->seqdata)); 398 spin_lock_init(&new->seqdata.sd_lock); 399 new->cred = tmp->cred; 400 tmp->cred.cr_group_info = NULL; 401 new->cred.cr_principal = tmp->cred.cr_principal; 402 tmp->cred.cr_principal = NULL; 403 } 404 405 static struct cache_head * 406 rsc_alloc(void) 407 { 408 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 409 if (rsci) 410 return &rsci->h; 411 else 412 return NULL; 413 } 414 415 static int rsc_parse(struct cache_detail *cd, 416 char *mesg, int mlen) 417 { 418 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 419 char *buf = mesg; 420 int len, rv; 421 struct rsc rsci, *rscp = NULL; 422 time_t expiry; 423 int status = -EINVAL; 424 struct gss_api_mech *gm = NULL; 425 426 memset(&rsci, 0, sizeof(rsci)); 427 /* context handle */ 428 len = qword_get(&mesg, buf, mlen); 429 if (len < 0) goto out; 430 status = -ENOMEM; 431 if (dup_to_netobj(&rsci.handle, buf, len)) 432 goto out; 433 434 rsci.h.flags = 0; 435 /* expiry */ 436 expiry = get_expiry(&mesg); 437 status = -EINVAL; 438 if (expiry == 0) 439 goto out; 440 441 rscp = rsc_lookup(cd, &rsci); 442 if (!rscp) 443 goto out; 444 445 /* uid, or NEGATIVE */ 446 rv = get_int(&mesg, &rsci.cred.cr_uid); 447 if (rv == -EINVAL) 448 goto out; 449 if (rv == -ENOENT) 450 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 451 else { 452 int N, i; 453 454 /* gid */ 455 if (get_int(&mesg, &rsci.cred.cr_gid)) 456 goto out; 457 458 /* number of additional gid's */ 459 if (get_int(&mesg, &N)) 460 goto out; 461 status = -ENOMEM; 462 rsci.cred.cr_group_info = groups_alloc(N); 463 if (rsci.cred.cr_group_info == NULL) 464 goto out; 465 466 /* gid's */ 467 status = -EINVAL; 468 for (i=0; i<N; i++) { 469 gid_t gid; 470 if (get_int(&mesg, &gid)) 471 goto out; 472 GROUP_AT(rsci.cred.cr_group_info, i) = gid; 473 } 474 475 /* mech name */ 476 len = qword_get(&mesg, buf, mlen); 477 if (len < 0) 478 goto out; 479 gm = gss_mech_get_by_name(buf); 480 status = -EOPNOTSUPP; 481 if (!gm) 482 goto out; 483 484 status = -EINVAL; 485 /* mech-specific data: */ 486 len = qword_get(&mesg, buf, mlen); 487 if (len < 0) 488 goto out; 489 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, GFP_KERNEL); 490 if (status) 491 goto out; 492 493 /* get client name */ 494 len = qword_get(&mesg, buf, mlen); 495 if (len > 0) { 496 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL); 497 if (!rsci.cred.cr_principal) 498 goto out; 499 } 500 501 } 502 rsci.h.expiry_time = expiry; 503 rscp = rsc_update(cd, &rsci, rscp); 504 status = 0; 505 out: 506 gss_mech_put(gm); 507 rsc_free(&rsci); 508 if (rscp) 509 cache_put(&rscp->h, cd); 510 else 511 status = -ENOMEM; 512 return status; 513 } 514 515 static struct cache_detail rsc_cache_template = { 516 .owner = THIS_MODULE, 517 .hash_size = RSC_HASHMAX, 518 .name = "auth.rpcsec.context", 519 .cache_put = rsc_put, 520 .cache_parse = rsc_parse, 521 .match = rsc_match, 522 .init = rsc_init, 523 .update = update_rsc, 524 .alloc = rsc_alloc, 525 }; 526 527 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) 528 { 529 struct cache_head *ch; 530 int hash = rsc_hash(item); 531 532 ch = sunrpc_cache_lookup(cd, &item->h, hash); 533 if (ch) 534 return container_of(ch, struct rsc, h); 535 else 536 return NULL; 537 } 538 539 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) 540 { 541 struct cache_head *ch; 542 int hash = rsc_hash(new); 543 544 ch = sunrpc_cache_update(cd, &new->h, 545 &old->h, hash); 546 if (ch) 547 return container_of(ch, struct rsc, h); 548 else 549 return NULL; 550 } 551 552 553 static struct rsc * 554 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) 555 { 556 struct rsc rsci; 557 struct rsc *found; 558 559 memset(&rsci, 0, sizeof(rsci)); 560 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 561 return NULL; 562 found = rsc_lookup(cd, &rsci); 563 rsc_free(&rsci); 564 if (!found) 565 return NULL; 566 if (cache_check(cd, &found->h, NULL)) 567 return NULL; 568 return found; 569 } 570 571 /* Implements sequence number algorithm as specified in RFC 2203. */ 572 static int 573 gss_check_seq_num(struct rsc *rsci, int seq_num) 574 { 575 struct gss_svc_seq_data *sd = &rsci->seqdata; 576 577 spin_lock(&sd->sd_lock); 578 if (seq_num > sd->sd_max) { 579 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 580 memset(sd->sd_win,0,sizeof(sd->sd_win)); 581 sd->sd_max = seq_num; 582 } else while (sd->sd_max < seq_num) { 583 sd->sd_max++; 584 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 585 } 586 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 587 goto ok; 588 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 589 goto drop; 590 } 591 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 592 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 593 goto drop; 594 ok: 595 spin_unlock(&sd->sd_lock); 596 return 1; 597 drop: 598 spin_unlock(&sd->sd_lock); 599 return 0; 600 } 601 602 static inline u32 round_up_to_quad(u32 i) 603 { 604 return (i + 3 ) & ~3; 605 } 606 607 static inline int 608 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 609 { 610 int l; 611 612 if (argv->iov_len < 4) 613 return -1; 614 o->len = svc_getnl(argv); 615 l = round_up_to_quad(o->len); 616 if (argv->iov_len < l) 617 return -1; 618 o->data = argv->iov_base; 619 argv->iov_base += l; 620 argv->iov_len -= l; 621 return 0; 622 } 623 624 static inline int 625 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 626 { 627 u8 *p; 628 629 if (resv->iov_len + 4 > PAGE_SIZE) 630 return -1; 631 svc_putnl(resv, o->len); 632 p = resv->iov_base + resv->iov_len; 633 resv->iov_len += round_up_to_quad(o->len); 634 if (resv->iov_len > PAGE_SIZE) 635 return -1; 636 memcpy(p, o->data, o->len); 637 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 638 return 0; 639 } 640 641 /* 642 * Verify the checksum on the header and return SVC_OK on success. 643 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 644 * or return SVC_DENIED and indicate error in authp. 645 */ 646 static int 647 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 648 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 649 { 650 struct gss_ctx *ctx_id = rsci->mechctx; 651 struct xdr_buf rpchdr; 652 struct xdr_netobj checksum; 653 u32 flavor = 0; 654 struct kvec *argv = &rqstp->rq_arg.head[0]; 655 struct kvec iov; 656 657 /* data to compute the checksum over: */ 658 iov.iov_base = rpcstart; 659 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 660 xdr_buf_from_iov(&iov, &rpchdr); 661 662 *authp = rpc_autherr_badverf; 663 if (argv->iov_len < 4) 664 return SVC_DENIED; 665 flavor = svc_getnl(argv); 666 if (flavor != RPC_AUTH_GSS) 667 return SVC_DENIED; 668 if (svc_safe_getnetobj(argv, &checksum)) 669 return SVC_DENIED; 670 671 if (rqstp->rq_deferred) /* skip verification of revisited request */ 672 return SVC_OK; 673 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 674 *authp = rpcsec_gsserr_credproblem; 675 return SVC_DENIED; 676 } 677 678 if (gc->gc_seq > MAXSEQ) { 679 dprintk("RPC: svcauth_gss: discarding request with " 680 "large sequence number %d\n", gc->gc_seq); 681 *authp = rpcsec_gsserr_ctxproblem; 682 return SVC_DENIED; 683 } 684 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 685 dprintk("RPC: svcauth_gss: discarding request with " 686 "old sequence number %d\n", gc->gc_seq); 687 return SVC_DROP; 688 } 689 return SVC_OK; 690 } 691 692 static int 693 gss_write_null_verf(struct svc_rqst *rqstp) 694 { 695 __be32 *p; 696 697 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 698 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 699 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 700 *p++ = 0; 701 if (!xdr_ressize_check(rqstp, p)) 702 return -1; 703 return 0; 704 } 705 706 static int 707 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 708 { 709 __be32 xdr_seq; 710 u32 maj_stat; 711 struct xdr_buf verf_data; 712 struct xdr_netobj mic; 713 __be32 *p; 714 struct kvec iov; 715 716 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 717 xdr_seq = htonl(seq); 718 719 iov.iov_base = &xdr_seq; 720 iov.iov_len = sizeof(xdr_seq); 721 xdr_buf_from_iov(&iov, &verf_data); 722 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 723 mic.data = (u8 *)(p + 1); 724 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 725 if (maj_stat != GSS_S_COMPLETE) 726 return -1; 727 *p++ = htonl(mic.len); 728 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 729 p += XDR_QUADLEN(mic.len); 730 if (!xdr_ressize_check(rqstp, p)) 731 return -1; 732 return 0; 733 } 734 735 struct gss_domain { 736 struct auth_domain h; 737 u32 pseudoflavor; 738 }; 739 740 static struct auth_domain * 741 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 742 { 743 char *name; 744 745 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 746 if (!name) 747 return NULL; 748 return auth_domain_find(name); 749 } 750 751 static struct auth_ops svcauthops_gss; 752 753 u32 svcauth_gss_flavor(struct auth_domain *dom) 754 { 755 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 756 757 return gd->pseudoflavor; 758 } 759 760 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 761 762 int 763 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 764 { 765 struct gss_domain *new; 766 struct auth_domain *test; 767 int stat = -ENOMEM; 768 769 new = kmalloc(sizeof(*new), GFP_KERNEL); 770 if (!new) 771 goto out; 772 kref_init(&new->h.ref); 773 new->h.name = kstrdup(name, GFP_KERNEL); 774 if (!new->h.name) 775 goto out_free_dom; 776 new->h.flavour = &svcauthops_gss; 777 new->pseudoflavor = pseudoflavor; 778 779 stat = 0; 780 test = auth_domain_lookup(name, &new->h); 781 if (test != &new->h) { /* Duplicate registration */ 782 auth_domain_put(test); 783 kfree(new->h.name); 784 goto out_free_dom; 785 } 786 return 0; 787 788 out_free_dom: 789 kfree(new); 790 out: 791 return stat; 792 } 793 794 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 795 796 static inline int 797 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 798 { 799 __be32 raw; 800 int status; 801 802 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 803 if (status) 804 return status; 805 *obj = ntohl(raw); 806 return 0; 807 } 808 809 /* It would be nice if this bit of code could be shared with the client. 810 * Obstacles: 811 * The client shouldn't malloc(), would have to pass in own memory. 812 * The server uses base of head iovec as read pointer, while the 813 * client uses separate pointer. */ 814 static int 815 unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 816 { 817 int stat = -EINVAL; 818 u32 integ_len, maj_stat; 819 struct xdr_netobj mic; 820 struct xdr_buf integ_buf; 821 822 integ_len = svc_getnl(&buf->head[0]); 823 if (integ_len & 3) 824 return stat; 825 if (integ_len > buf->len) 826 return stat; 827 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 828 BUG(); 829 /* copy out mic... */ 830 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 831 BUG(); 832 if (mic.len > RPC_MAX_AUTH_SIZE) 833 return stat; 834 mic.data = kmalloc(mic.len, GFP_KERNEL); 835 if (!mic.data) 836 return stat; 837 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 838 goto out; 839 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 840 if (maj_stat != GSS_S_COMPLETE) 841 goto out; 842 if (svc_getnl(&buf->head[0]) != seq) 843 goto out; 844 stat = 0; 845 out: 846 kfree(mic.data); 847 return stat; 848 } 849 850 static inline int 851 total_buf_len(struct xdr_buf *buf) 852 { 853 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 854 } 855 856 static void 857 fix_priv_head(struct xdr_buf *buf, int pad) 858 { 859 if (buf->page_len == 0) { 860 /* We need to adjust head and buf->len in tandem in this 861 * case to make svc_defer() work--it finds the original 862 * buffer start using buf->len - buf->head[0].iov_len. */ 863 buf->head[0].iov_len -= pad; 864 } 865 } 866 867 static int 868 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 869 { 870 u32 priv_len, maj_stat; 871 int pad, saved_len, remaining_len, offset; 872 873 rqstp->rq_splice_ok = 0; 874 875 priv_len = svc_getnl(&buf->head[0]); 876 if (rqstp->rq_deferred) { 877 /* Already decrypted last time through! The sequence number 878 * check at out_seq is unnecessary but harmless: */ 879 goto out_seq; 880 } 881 /* buf->len is the number of bytes from the original start of the 882 * request to the end, where head[0].iov_len is just the bytes 883 * not yet read from the head, so these two values are different: */ 884 remaining_len = total_buf_len(buf); 885 if (priv_len > remaining_len) 886 return -EINVAL; 887 pad = remaining_len - priv_len; 888 buf->len -= pad; 889 fix_priv_head(buf, pad); 890 891 /* Maybe it would be better to give gss_unwrap a length parameter: */ 892 saved_len = buf->len; 893 buf->len = priv_len; 894 maj_stat = gss_unwrap(ctx, 0, buf); 895 pad = priv_len - buf->len; 896 buf->len = saved_len; 897 buf->len -= pad; 898 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 899 * In the krb5p case, at least, the data ends up offset, so we need to 900 * move it around. */ 901 /* XXX: This is very inefficient. It would be better to either do 902 * this while we encrypt, or maybe in the receive code, if we can peak 903 * ahead and work out the service and mechanism there. */ 904 offset = buf->head[0].iov_len % 4; 905 if (offset) { 906 buf->buflen = RPCSVC_MAXPAYLOAD; 907 xdr_shift_buf(buf, offset); 908 fix_priv_head(buf, pad); 909 } 910 if (maj_stat != GSS_S_COMPLETE) 911 return -EINVAL; 912 out_seq: 913 if (svc_getnl(&buf->head[0]) != seq) 914 return -EINVAL; 915 return 0; 916 } 917 918 struct gss_svc_data { 919 /* decoded gss client cred: */ 920 struct rpc_gss_wire_cred clcred; 921 /* save a pointer to the beginning of the encoded verifier, 922 * for use in encryption/checksumming in svcauth_gss_release: */ 923 __be32 *verf_start; 924 struct rsc *rsci; 925 }; 926 927 static int 928 svcauth_gss_set_client(struct svc_rqst *rqstp) 929 { 930 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 931 struct rsc *rsci = svcdata->rsci; 932 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 933 int stat; 934 935 /* 936 * A gss export can be specified either by: 937 * export *(sec=krb5,rw) 938 * or by 939 * export gss/krb5(rw) 940 * The latter is deprecated; but for backwards compatibility reasons 941 * the nfsd code will still fall back on trying it if the former 942 * doesn't work; so we try to make both available to nfsd, below. 943 */ 944 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 945 if (rqstp->rq_gssclient == NULL) 946 return SVC_DENIED; 947 stat = svcauth_unix_set_client(rqstp); 948 if (stat == SVC_DROP || stat == SVC_CLOSE) 949 return stat; 950 return SVC_OK; 951 } 952 953 static inline int 954 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, 955 struct xdr_netobj *out_handle, int *major_status) 956 { 957 struct rsc *rsci; 958 int rc; 959 960 if (*major_status != GSS_S_COMPLETE) 961 return gss_write_null_verf(rqstp); 962 rsci = gss_svc_searchbyctx(cd, out_handle); 963 if (rsci == NULL) { 964 *major_status = GSS_S_NO_CONTEXT; 965 return gss_write_null_verf(rqstp); 966 } 967 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 968 cache_put(&rsci->h, cd); 969 return rc; 970 } 971 972 static inline int 973 gss_read_verf(struct rpc_gss_wire_cred *gc, 974 struct kvec *argv, __be32 *authp, 975 struct xdr_netobj *in_handle, 976 struct xdr_netobj *in_token) 977 { 978 struct xdr_netobj tmpobj; 979 980 /* Read the verifier; should be NULL: */ 981 *authp = rpc_autherr_badverf; 982 if (argv->iov_len < 2 * 4) 983 return SVC_DENIED; 984 if (svc_getnl(argv) != RPC_AUTH_NULL) 985 return SVC_DENIED; 986 if (svc_getnl(argv) != 0) 987 return SVC_DENIED; 988 /* Martial context handle and token for upcall: */ 989 *authp = rpc_autherr_badcred; 990 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 991 return SVC_DENIED; 992 if (dup_netobj(in_handle, &gc->gc_ctx)) 993 return SVC_CLOSE; 994 *authp = rpc_autherr_badverf; 995 if (svc_safe_getnetobj(argv, &tmpobj)) { 996 kfree(in_handle->data); 997 return SVC_DENIED; 998 } 999 if (dup_netobj(in_token, &tmpobj)) { 1000 kfree(in_handle->data); 1001 return SVC_CLOSE; 1002 } 1003 1004 return 0; 1005 } 1006 1007 static inline int 1008 gss_write_resv(struct kvec *resv, size_t size_limit, 1009 struct xdr_netobj *out_handle, struct xdr_netobj *out_token, 1010 int major_status, int minor_status) 1011 { 1012 if (resv->iov_len + 4 > size_limit) 1013 return -1; 1014 svc_putnl(resv, RPC_SUCCESS); 1015 if (svc_safe_putnetobj(resv, out_handle)) 1016 return -1; 1017 if (resv->iov_len + 3 * 4 > size_limit) 1018 return -1; 1019 svc_putnl(resv, major_status); 1020 svc_putnl(resv, minor_status); 1021 svc_putnl(resv, GSS_SEQ_WIN); 1022 if (svc_safe_putnetobj(resv, out_token)) 1023 return -1; 1024 return 0; 1025 } 1026 1027 /* 1028 * Having read the cred already and found we're in the context 1029 * initiation case, read the verifier and initiate (or check the results 1030 * of) upcalls to userspace for help with context initiation. If 1031 * the upcall results are available, write the verifier and result. 1032 * Otherwise, drop the request pending an answer to the upcall. 1033 */ 1034 static int svcauth_gss_handle_init(struct svc_rqst *rqstp, 1035 struct rpc_gss_wire_cred *gc, __be32 *authp) 1036 { 1037 struct kvec *argv = &rqstp->rq_arg.head[0]; 1038 struct kvec *resv = &rqstp->rq_res.head[0]; 1039 struct rsi *rsip, rsikey; 1040 int ret; 1041 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1042 1043 memset(&rsikey, 0, sizeof(rsikey)); 1044 ret = gss_read_verf(gc, argv, authp, 1045 &rsikey.in_handle, &rsikey.in_token); 1046 if (ret) 1047 return ret; 1048 1049 /* Perform upcall, or find upcall result: */ 1050 rsip = rsi_lookup(sn->rsi_cache, &rsikey); 1051 rsi_free(&rsikey); 1052 if (!rsip) 1053 return SVC_CLOSE; 1054 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 1055 /* No upcall result: */ 1056 return SVC_CLOSE; 1057 1058 ret = SVC_CLOSE; 1059 /* Got an answer to the upcall; use it: */ 1060 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1061 &rsip->out_handle, &rsip->major_status)) 1062 goto out; 1063 if (gss_write_resv(resv, PAGE_SIZE, 1064 &rsip->out_handle, &rsip->out_token, 1065 rsip->major_status, rsip->minor_status)) 1066 goto out; 1067 1068 ret = SVC_COMPLETE; 1069 out: 1070 cache_put(&rsip->h, sn->rsi_cache); 1071 return ret; 1072 } 1073 1074 /* 1075 * Accept an rpcsec packet. 1076 * If context establishment, punt to user space 1077 * If data exchange, verify/decrypt 1078 * If context destruction, handle here 1079 * In the context establishment and destruction case we encode 1080 * response here and return SVC_COMPLETE. 1081 */ 1082 static int 1083 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 1084 { 1085 struct kvec *argv = &rqstp->rq_arg.head[0]; 1086 struct kvec *resv = &rqstp->rq_res.head[0]; 1087 u32 crlen; 1088 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1089 struct rpc_gss_wire_cred *gc; 1090 struct rsc *rsci = NULL; 1091 __be32 *rpcstart; 1092 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1093 int ret; 1094 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1095 1096 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 1097 argv->iov_len); 1098 1099 *authp = rpc_autherr_badcred; 1100 if (!svcdata) 1101 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1102 if (!svcdata) 1103 goto auth_err; 1104 rqstp->rq_auth_data = svcdata; 1105 svcdata->verf_start = NULL; 1106 svcdata->rsci = NULL; 1107 gc = &svcdata->clcred; 1108 1109 /* start of rpc packet is 7 u32's back from here: 1110 * xid direction rpcversion prog vers proc flavour 1111 */ 1112 rpcstart = argv->iov_base; 1113 rpcstart -= 7; 1114 1115 /* credential is: 1116 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1117 * at least 5 u32s, and is preceded by length, so that makes 6. 1118 */ 1119 1120 if (argv->iov_len < 5 * 4) 1121 goto auth_err; 1122 crlen = svc_getnl(argv); 1123 if (svc_getnl(argv) != RPC_GSS_VERSION) 1124 goto auth_err; 1125 gc->gc_proc = svc_getnl(argv); 1126 gc->gc_seq = svc_getnl(argv); 1127 gc->gc_svc = svc_getnl(argv); 1128 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1129 goto auth_err; 1130 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1131 goto auth_err; 1132 1133 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1134 goto auth_err; 1135 1136 *authp = rpc_autherr_badverf; 1137 switch (gc->gc_proc) { 1138 case RPC_GSS_PROC_INIT: 1139 case RPC_GSS_PROC_CONTINUE_INIT: 1140 return svcauth_gss_handle_init(rqstp, gc, authp); 1141 case RPC_GSS_PROC_DATA: 1142 case RPC_GSS_PROC_DESTROY: 1143 /* Look up the context, and check the verifier: */ 1144 *authp = rpcsec_gsserr_credproblem; 1145 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 1146 if (!rsci) 1147 goto auth_err; 1148 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1149 case SVC_OK: 1150 break; 1151 case SVC_DENIED: 1152 goto auth_err; 1153 case SVC_DROP: 1154 goto drop; 1155 } 1156 break; 1157 default: 1158 *authp = rpc_autherr_rejectedcred; 1159 goto auth_err; 1160 } 1161 1162 /* now act upon the command: */ 1163 switch (gc->gc_proc) { 1164 case RPC_GSS_PROC_DESTROY: 1165 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1166 goto auth_err; 1167 rsci->h.expiry_time = get_seconds(); 1168 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1169 if (resv->iov_len + 4 > PAGE_SIZE) 1170 goto drop; 1171 svc_putnl(resv, RPC_SUCCESS); 1172 goto complete; 1173 case RPC_GSS_PROC_DATA: 1174 *authp = rpcsec_gsserr_ctxproblem; 1175 svcdata->verf_start = resv->iov_base + resv->iov_len; 1176 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1177 goto auth_err; 1178 rqstp->rq_cred = rsci->cred; 1179 get_group_info(rsci->cred.cr_group_info); 1180 *authp = rpc_autherr_badcred; 1181 switch (gc->gc_svc) { 1182 case RPC_GSS_SVC_NONE: 1183 break; 1184 case RPC_GSS_SVC_INTEGRITY: 1185 /* placeholders for length and seq. number: */ 1186 svc_putnl(resv, 0); 1187 svc_putnl(resv, 0); 1188 if (unwrap_integ_data(&rqstp->rq_arg, 1189 gc->gc_seq, rsci->mechctx)) 1190 goto garbage_args; 1191 break; 1192 case RPC_GSS_SVC_PRIVACY: 1193 /* placeholders for length and seq. number: */ 1194 svc_putnl(resv, 0); 1195 svc_putnl(resv, 0); 1196 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1197 gc->gc_seq, rsci->mechctx)) 1198 goto garbage_args; 1199 break; 1200 default: 1201 goto auth_err; 1202 } 1203 svcdata->rsci = rsci; 1204 cache_get(&rsci->h); 1205 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( 1206 rsci->mechctx->mech_type, gc->gc_svc); 1207 ret = SVC_OK; 1208 goto out; 1209 } 1210 garbage_args: 1211 ret = SVC_GARBAGE; 1212 goto out; 1213 auth_err: 1214 /* Restore write pointer to its original value: */ 1215 xdr_ressize_check(rqstp, reject_stat); 1216 ret = SVC_DENIED; 1217 goto out; 1218 complete: 1219 ret = SVC_COMPLETE; 1220 goto out; 1221 drop: 1222 ret = SVC_DROP; 1223 out: 1224 if (rsci) 1225 cache_put(&rsci->h, sn->rsc_cache); 1226 return ret; 1227 } 1228 1229 static __be32 * 1230 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1231 { 1232 __be32 *p; 1233 u32 verf_len; 1234 1235 p = gsd->verf_start; 1236 gsd->verf_start = NULL; 1237 1238 /* If the reply stat is nonzero, don't wrap: */ 1239 if (*(p-1) != rpc_success) 1240 return NULL; 1241 /* Skip the verifier: */ 1242 p += 1; 1243 verf_len = ntohl(*p++); 1244 p += XDR_QUADLEN(verf_len); 1245 /* move accept_stat to right place: */ 1246 memcpy(p, p + 2, 4); 1247 /* Also don't wrap if the accept stat is nonzero: */ 1248 if (*p != rpc_success) { 1249 resbuf->head[0].iov_len -= 2 * 4; 1250 return NULL; 1251 } 1252 p++; 1253 return p; 1254 } 1255 1256 static inline int 1257 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1258 { 1259 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1260 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1261 struct xdr_buf *resbuf = &rqstp->rq_res; 1262 struct xdr_buf integ_buf; 1263 struct xdr_netobj mic; 1264 struct kvec *resv; 1265 __be32 *p; 1266 int integ_offset, integ_len; 1267 int stat = -EINVAL; 1268 1269 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1270 if (p == NULL) 1271 goto out; 1272 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1273 integ_len = resbuf->len - integ_offset; 1274 BUG_ON(integ_len % 4); 1275 *p++ = htonl(integ_len); 1276 *p++ = htonl(gc->gc_seq); 1277 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1278 integ_len)) 1279 BUG(); 1280 if (resbuf->tail[0].iov_base == NULL) { 1281 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1282 goto out_err; 1283 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1284 + resbuf->head[0].iov_len; 1285 resbuf->tail[0].iov_len = 0; 1286 resv = &resbuf->tail[0]; 1287 } else { 1288 resv = &resbuf->tail[0]; 1289 } 1290 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1291 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1292 goto out_err; 1293 svc_putnl(resv, mic.len); 1294 memset(mic.data + mic.len, 0, 1295 round_up_to_quad(mic.len) - mic.len); 1296 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1297 /* not strictly required: */ 1298 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1299 BUG_ON(resv->iov_len > PAGE_SIZE); 1300 out: 1301 stat = 0; 1302 out_err: 1303 return stat; 1304 } 1305 1306 static inline int 1307 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1308 { 1309 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1310 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1311 struct xdr_buf *resbuf = &rqstp->rq_res; 1312 struct page **inpages = NULL; 1313 __be32 *p, *len; 1314 int offset; 1315 int pad; 1316 1317 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1318 if (p == NULL) 1319 return 0; 1320 len = p++; 1321 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1322 *p++ = htonl(gc->gc_seq); 1323 inpages = resbuf->pages; 1324 /* XXX: Would be better to write some xdr helper functions for 1325 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1326 1327 /* 1328 * If there is currently tail data, make sure there is 1329 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1330 * the page, and move the current tail data such that 1331 * there is RPC_MAX_AUTH_SIZE slack space available in 1332 * both the head and tail. 1333 */ 1334 if (resbuf->tail[0].iov_base) { 1335 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1336 + PAGE_SIZE); 1337 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1338 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1339 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1340 return -ENOMEM; 1341 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1342 resbuf->tail[0].iov_base, 1343 resbuf->tail[0].iov_len); 1344 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1345 } 1346 /* 1347 * If there is no current tail data, make sure there is 1348 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1349 * allotted page, and set up tail information such that there 1350 * is RPC_MAX_AUTH_SIZE slack space available in both the 1351 * head and tail. 1352 */ 1353 if (resbuf->tail[0].iov_base == NULL) { 1354 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1355 return -ENOMEM; 1356 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1357 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1358 resbuf->tail[0].iov_len = 0; 1359 } 1360 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1361 return -ENOMEM; 1362 *len = htonl(resbuf->len - offset); 1363 pad = 3 - ((resbuf->len - offset - 1)&3); 1364 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1365 memset(p, 0, pad); 1366 resbuf->tail[0].iov_len += pad; 1367 resbuf->len += pad; 1368 return 0; 1369 } 1370 1371 static int 1372 svcauth_gss_release(struct svc_rqst *rqstp) 1373 { 1374 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1375 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1376 struct xdr_buf *resbuf = &rqstp->rq_res; 1377 int stat = -EINVAL; 1378 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1379 1380 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1381 goto out; 1382 /* Release can be called twice, but we only wrap once. */ 1383 if (gsd->verf_start == NULL) 1384 goto out; 1385 /* normally not set till svc_send, but we need it here: */ 1386 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1387 * or whatever? */ 1388 resbuf->len = total_buf_len(resbuf); 1389 switch (gc->gc_svc) { 1390 case RPC_GSS_SVC_NONE: 1391 break; 1392 case RPC_GSS_SVC_INTEGRITY: 1393 stat = svcauth_gss_wrap_resp_integ(rqstp); 1394 if (stat) 1395 goto out_err; 1396 break; 1397 case RPC_GSS_SVC_PRIVACY: 1398 stat = svcauth_gss_wrap_resp_priv(rqstp); 1399 if (stat) 1400 goto out_err; 1401 break; 1402 /* 1403 * For any other gc_svc value, svcauth_gss_accept() already set 1404 * the auth_error appropriately; just fall through: 1405 */ 1406 } 1407 1408 out: 1409 stat = 0; 1410 out_err: 1411 if (rqstp->rq_client) 1412 auth_domain_put(rqstp->rq_client); 1413 rqstp->rq_client = NULL; 1414 if (rqstp->rq_gssclient) 1415 auth_domain_put(rqstp->rq_gssclient); 1416 rqstp->rq_gssclient = NULL; 1417 if (rqstp->rq_cred.cr_group_info) 1418 put_group_info(rqstp->rq_cred.cr_group_info); 1419 rqstp->rq_cred.cr_group_info = NULL; 1420 if (gsd->rsci) 1421 cache_put(&gsd->rsci->h, sn->rsc_cache); 1422 gsd->rsci = NULL; 1423 1424 return stat; 1425 } 1426 1427 static void 1428 svcauth_gss_domain_release(struct auth_domain *dom) 1429 { 1430 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1431 1432 kfree(dom->name); 1433 kfree(gd); 1434 } 1435 1436 static struct auth_ops svcauthops_gss = { 1437 .name = "rpcsec_gss", 1438 .owner = THIS_MODULE, 1439 .flavour = RPC_AUTH_GSS, 1440 .accept = svcauth_gss_accept, 1441 .release = svcauth_gss_release, 1442 .domain_release = svcauth_gss_domain_release, 1443 .set_client = svcauth_gss_set_client, 1444 }; 1445 1446 static int rsi_cache_create_net(struct net *net) 1447 { 1448 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1449 struct cache_detail *cd; 1450 int err; 1451 1452 cd = cache_create_net(&rsi_cache_template, net); 1453 if (IS_ERR(cd)) 1454 return PTR_ERR(cd); 1455 err = cache_register_net(cd, net); 1456 if (err) { 1457 cache_destroy_net(cd, net); 1458 return err; 1459 } 1460 sn->rsi_cache = cd; 1461 return 0; 1462 } 1463 1464 static void rsi_cache_destroy_net(struct net *net) 1465 { 1466 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1467 struct cache_detail *cd = sn->rsi_cache; 1468 1469 sn->rsi_cache = NULL; 1470 cache_purge(cd); 1471 cache_unregister_net(cd, net); 1472 cache_destroy_net(cd, net); 1473 } 1474 1475 static int rsc_cache_create_net(struct net *net) 1476 { 1477 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1478 struct cache_detail *cd; 1479 int err; 1480 1481 cd = cache_create_net(&rsc_cache_template, net); 1482 if (IS_ERR(cd)) 1483 return PTR_ERR(cd); 1484 err = cache_register_net(cd, net); 1485 if (err) { 1486 cache_destroy_net(cd, net); 1487 return err; 1488 } 1489 sn->rsc_cache = cd; 1490 return 0; 1491 } 1492 1493 static void rsc_cache_destroy_net(struct net *net) 1494 { 1495 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1496 struct cache_detail *cd = sn->rsc_cache; 1497 1498 sn->rsc_cache = NULL; 1499 cache_purge(cd); 1500 cache_unregister_net(cd, net); 1501 cache_destroy_net(cd, net); 1502 } 1503 1504 int 1505 gss_svc_init_net(struct net *net) 1506 { 1507 int rv; 1508 1509 rv = rsc_cache_create_net(net); 1510 if (rv) 1511 return rv; 1512 rv = rsi_cache_create_net(net); 1513 if (rv) 1514 goto out1; 1515 return 0; 1516 out1: 1517 rsc_cache_destroy_net(net); 1518 return rv; 1519 } 1520 1521 void 1522 gss_svc_shutdown_net(struct net *net) 1523 { 1524 rsi_cache_destroy_net(net); 1525 rsc_cache_destroy_net(net); 1526 } 1527 1528 int 1529 gss_svc_init(void) 1530 { 1531 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1532 } 1533 1534 void 1535 gss_svc_shutdown(void) 1536 { 1537 svc_auth_unregister(RPC_AUTH_GSS); 1538 } 1539