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 char *client_name; 339 }; 340 341 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old); 342 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item); 343 344 static void rsc_free(struct rsc *rsci) 345 { 346 kfree(rsci->handle.data); 347 if (rsci->mechctx) 348 gss_delete_sec_context(&rsci->mechctx); 349 if (rsci->cred.cr_group_info) 350 put_group_info(rsci->cred.cr_group_info); 351 kfree(rsci->client_name); 352 } 353 354 static void rsc_put(struct kref *ref) 355 { 356 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 357 358 rsc_free(rsci); 359 kfree(rsci); 360 } 361 362 static inline int 363 rsc_hash(struct rsc *rsci) 364 { 365 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 366 } 367 368 static int 369 rsc_match(struct cache_head *a, struct cache_head *b) 370 { 371 struct rsc *new = container_of(a, struct rsc, h); 372 struct rsc *tmp = container_of(b, struct rsc, h); 373 374 return netobj_equal(&new->handle, &tmp->handle); 375 } 376 377 static void 378 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 379 { 380 struct rsc *new = container_of(cnew, struct rsc, h); 381 struct rsc *tmp = container_of(ctmp, struct rsc, h); 382 383 new->handle.len = tmp->handle.len; 384 tmp->handle.len = 0; 385 new->handle.data = tmp->handle.data; 386 tmp->handle.data = NULL; 387 new->mechctx = NULL; 388 new->cred.cr_group_info = NULL; 389 new->client_name = NULL; 390 } 391 392 static void 393 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 394 { 395 struct rsc *new = container_of(cnew, struct rsc, h); 396 struct rsc *tmp = container_of(ctmp, struct rsc, h); 397 398 new->mechctx = tmp->mechctx; 399 tmp->mechctx = NULL; 400 memset(&new->seqdata, 0, sizeof(new->seqdata)); 401 spin_lock_init(&new->seqdata.sd_lock); 402 new->cred = tmp->cred; 403 tmp->cred.cr_group_info = NULL; 404 new->client_name = tmp->client_name; 405 tmp->client_name = NULL; 406 } 407 408 static struct cache_head * 409 rsc_alloc(void) 410 { 411 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 412 if (rsci) 413 return &rsci->h; 414 else 415 return NULL; 416 } 417 418 static int rsc_parse(struct cache_detail *cd, 419 char *mesg, int mlen) 420 { 421 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 422 char *buf = mesg; 423 int len, rv; 424 struct rsc rsci, *rscp = NULL; 425 time_t expiry; 426 int status = -EINVAL; 427 struct gss_api_mech *gm = NULL; 428 429 memset(&rsci, 0, sizeof(rsci)); 430 /* context handle */ 431 len = qword_get(&mesg, buf, mlen); 432 if (len < 0) goto out; 433 status = -ENOMEM; 434 if (dup_to_netobj(&rsci.handle, buf, len)) 435 goto out; 436 437 rsci.h.flags = 0; 438 /* expiry */ 439 expiry = get_expiry(&mesg); 440 status = -EINVAL; 441 if (expiry == 0) 442 goto out; 443 444 rscp = rsc_lookup(cd, &rsci); 445 if (!rscp) 446 goto out; 447 448 /* uid, or NEGATIVE */ 449 rv = get_int(&mesg, &rsci.cred.cr_uid); 450 if (rv == -EINVAL) 451 goto out; 452 if (rv == -ENOENT) 453 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 454 else { 455 int N, i; 456 457 /* gid */ 458 if (get_int(&mesg, &rsci.cred.cr_gid)) 459 goto out; 460 461 /* number of additional gid's */ 462 if (get_int(&mesg, &N)) 463 goto out; 464 status = -ENOMEM; 465 rsci.cred.cr_group_info = groups_alloc(N); 466 if (rsci.cred.cr_group_info == NULL) 467 goto out; 468 469 /* gid's */ 470 status = -EINVAL; 471 for (i=0; i<N; i++) { 472 gid_t gid; 473 if (get_int(&mesg, &gid)) 474 goto out; 475 GROUP_AT(rsci.cred.cr_group_info, i) = gid; 476 } 477 478 /* mech name */ 479 len = qword_get(&mesg, buf, mlen); 480 if (len < 0) 481 goto out; 482 gm = gss_mech_get_by_name(buf); 483 status = -EOPNOTSUPP; 484 if (!gm) 485 goto out; 486 487 status = -EINVAL; 488 /* mech-specific data: */ 489 len = qword_get(&mesg, buf, mlen); 490 if (len < 0) 491 goto out; 492 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, GFP_KERNEL); 493 if (status) 494 goto out; 495 496 /* get client name */ 497 len = qword_get(&mesg, buf, mlen); 498 if (len > 0) { 499 rsci.client_name = kstrdup(buf, GFP_KERNEL); 500 if (!rsci.client_name) 501 goto out; 502 } 503 504 } 505 rsci.h.expiry_time = expiry; 506 rscp = rsc_update(cd, &rsci, rscp); 507 status = 0; 508 out: 509 gss_mech_put(gm); 510 rsc_free(&rsci); 511 if (rscp) 512 cache_put(&rscp->h, cd); 513 else 514 status = -ENOMEM; 515 return status; 516 } 517 518 static struct cache_detail rsc_cache_template = { 519 .owner = THIS_MODULE, 520 .hash_size = RSC_HASHMAX, 521 .name = "auth.rpcsec.context", 522 .cache_put = rsc_put, 523 .cache_parse = rsc_parse, 524 .match = rsc_match, 525 .init = rsc_init, 526 .update = update_rsc, 527 .alloc = rsc_alloc, 528 }; 529 530 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) 531 { 532 struct cache_head *ch; 533 int hash = rsc_hash(item); 534 535 ch = sunrpc_cache_lookup(cd, &item->h, hash); 536 if (ch) 537 return container_of(ch, struct rsc, h); 538 else 539 return NULL; 540 } 541 542 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) 543 { 544 struct cache_head *ch; 545 int hash = rsc_hash(new); 546 547 ch = sunrpc_cache_update(cd, &new->h, 548 &old->h, hash); 549 if (ch) 550 return container_of(ch, struct rsc, h); 551 else 552 return NULL; 553 } 554 555 556 static struct rsc * 557 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) 558 { 559 struct rsc rsci; 560 struct rsc *found; 561 562 memset(&rsci, 0, sizeof(rsci)); 563 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 564 return NULL; 565 found = rsc_lookup(cd, &rsci); 566 rsc_free(&rsci); 567 if (!found) 568 return NULL; 569 if (cache_check(cd, &found->h, NULL)) 570 return NULL; 571 return found; 572 } 573 574 /* Implements sequence number algorithm as specified in RFC 2203. */ 575 static int 576 gss_check_seq_num(struct rsc *rsci, int seq_num) 577 { 578 struct gss_svc_seq_data *sd = &rsci->seqdata; 579 580 spin_lock(&sd->sd_lock); 581 if (seq_num > sd->sd_max) { 582 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 583 memset(sd->sd_win,0,sizeof(sd->sd_win)); 584 sd->sd_max = seq_num; 585 } else while (sd->sd_max < seq_num) { 586 sd->sd_max++; 587 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 588 } 589 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 590 goto ok; 591 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 592 goto drop; 593 } 594 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 595 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 596 goto drop; 597 ok: 598 spin_unlock(&sd->sd_lock); 599 return 1; 600 drop: 601 spin_unlock(&sd->sd_lock); 602 return 0; 603 } 604 605 static inline u32 round_up_to_quad(u32 i) 606 { 607 return (i + 3 ) & ~3; 608 } 609 610 static inline int 611 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 612 { 613 int l; 614 615 if (argv->iov_len < 4) 616 return -1; 617 o->len = svc_getnl(argv); 618 l = round_up_to_quad(o->len); 619 if (argv->iov_len < l) 620 return -1; 621 o->data = argv->iov_base; 622 argv->iov_base += l; 623 argv->iov_len -= l; 624 return 0; 625 } 626 627 static inline int 628 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 629 { 630 u8 *p; 631 632 if (resv->iov_len + 4 > PAGE_SIZE) 633 return -1; 634 svc_putnl(resv, o->len); 635 p = resv->iov_base + resv->iov_len; 636 resv->iov_len += round_up_to_quad(o->len); 637 if (resv->iov_len > PAGE_SIZE) 638 return -1; 639 memcpy(p, o->data, o->len); 640 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 641 return 0; 642 } 643 644 /* 645 * Verify the checksum on the header and return SVC_OK on success. 646 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 647 * or return SVC_DENIED and indicate error in authp. 648 */ 649 static int 650 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 651 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 652 { 653 struct gss_ctx *ctx_id = rsci->mechctx; 654 struct xdr_buf rpchdr; 655 struct xdr_netobj checksum; 656 u32 flavor = 0; 657 struct kvec *argv = &rqstp->rq_arg.head[0]; 658 struct kvec iov; 659 660 /* data to compute the checksum over: */ 661 iov.iov_base = rpcstart; 662 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 663 xdr_buf_from_iov(&iov, &rpchdr); 664 665 *authp = rpc_autherr_badverf; 666 if (argv->iov_len < 4) 667 return SVC_DENIED; 668 flavor = svc_getnl(argv); 669 if (flavor != RPC_AUTH_GSS) 670 return SVC_DENIED; 671 if (svc_safe_getnetobj(argv, &checksum)) 672 return SVC_DENIED; 673 674 if (rqstp->rq_deferred) /* skip verification of revisited request */ 675 return SVC_OK; 676 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 677 *authp = rpcsec_gsserr_credproblem; 678 return SVC_DENIED; 679 } 680 681 if (gc->gc_seq > MAXSEQ) { 682 dprintk("RPC: svcauth_gss: discarding request with " 683 "large sequence number %d\n", gc->gc_seq); 684 *authp = rpcsec_gsserr_ctxproblem; 685 return SVC_DENIED; 686 } 687 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 688 dprintk("RPC: svcauth_gss: discarding request with " 689 "old sequence number %d\n", gc->gc_seq); 690 return SVC_DROP; 691 } 692 return SVC_OK; 693 } 694 695 static int 696 gss_write_null_verf(struct svc_rqst *rqstp) 697 { 698 __be32 *p; 699 700 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 701 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 702 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 703 *p++ = 0; 704 if (!xdr_ressize_check(rqstp, p)) 705 return -1; 706 return 0; 707 } 708 709 static int 710 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 711 { 712 __be32 xdr_seq; 713 u32 maj_stat; 714 struct xdr_buf verf_data; 715 struct xdr_netobj mic; 716 __be32 *p; 717 struct kvec iov; 718 719 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 720 xdr_seq = htonl(seq); 721 722 iov.iov_base = &xdr_seq; 723 iov.iov_len = sizeof(xdr_seq); 724 xdr_buf_from_iov(&iov, &verf_data); 725 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 726 mic.data = (u8 *)(p + 1); 727 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 728 if (maj_stat != GSS_S_COMPLETE) 729 return -1; 730 *p++ = htonl(mic.len); 731 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 732 p += XDR_QUADLEN(mic.len); 733 if (!xdr_ressize_check(rqstp, p)) 734 return -1; 735 return 0; 736 } 737 738 struct gss_domain { 739 struct auth_domain h; 740 u32 pseudoflavor; 741 }; 742 743 static struct auth_domain * 744 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 745 { 746 char *name; 747 748 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 749 if (!name) 750 return NULL; 751 return auth_domain_find(name); 752 } 753 754 static struct auth_ops svcauthops_gss; 755 756 u32 svcauth_gss_flavor(struct auth_domain *dom) 757 { 758 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 759 760 return gd->pseudoflavor; 761 } 762 763 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 764 765 int 766 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 767 { 768 struct gss_domain *new; 769 struct auth_domain *test; 770 int stat = -ENOMEM; 771 772 new = kmalloc(sizeof(*new), GFP_KERNEL); 773 if (!new) 774 goto out; 775 kref_init(&new->h.ref); 776 new->h.name = kstrdup(name, GFP_KERNEL); 777 if (!new->h.name) 778 goto out_free_dom; 779 new->h.flavour = &svcauthops_gss; 780 new->pseudoflavor = pseudoflavor; 781 782 stat = 0; 783 test = auth_domain_lookup(name, &new->h); 784 if (test != &new->h) { /* Duplicate registration */ 785 auth_domain_put(test); 786 kfree(new->h.name); 787 goto out_free_dom; 788 } 789 return 0; 790 791 out_free_dom: 792 kfree(new); 793 out: 794 return stat; 795 } 796 797 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 798 799 static inline int 800 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 801 { 802 __be32 raw; 803 int status; 804 805 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 806 if (status) 807 return status; 808 *obj = ntohl(raw); 809 return 0; 810 } 811 812 /* It would be nice if this bit of code could be shared with the client. 813 * Obstacles: 814 * The client shouldn't malloc(), would have to pass in own memory. 815 * The server uses base of head iovec as read pointer, while the 816 * client uses separate pointer. */ 817 static int 818 unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 819 { 820 int stat = -EINVAL; 821 u32 integ_len, maj_stat; 822 struct xdr_netobj mic; 823 struct xdr_buf integ_buf; 824 825 integ_len = svc_getnl(&buf->head[0]); 826 if (integ_len & 3) 827 return stat; 828 if (integ_len > buf->len) 829 return stat; 830 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 831 BUG(); 832 /* copy out mic... */ 833 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 834 BUG(); 835 if (mic.len > RPC_MAX_AUTH_SIZE) 836 return stat; 837 mic.data = kmalloc(mic.len, GFP_KERNEL); 838 if (!mic.data) 839 return stat; 840 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 841 goto out; 842 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 843 if (maj_stat != GSS_S_COMPLETE) 844 goto out; 845 if (svc_getnl(&buf->head[0]) != seq) 846 goto out; 847 stat = 0; 848 out: 849 kfree(mic.data); 850 return stat; 851 } 852 853 static inline int 854 total_buf_len(struct xdr_buf *buf) 855 { 856 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 857 } 858 859 static void 860 fix_priv_head(struct xdr_buf *buf, int pad) 861 { 862 if (buf->page_len == 0) { 863 /* We need to adjust head and buf->len in tandem in this 864 * case to make svc_defer() work--it finds the original 865 * buffer start using buf->len - buf->head[0].iov_len. */ 866 buf->head[0].iov_len -= pad; 867 } 868 } 869 870 static int 871 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 872 { 873 u32 priv_len, maj_stat; 874 int pad, saved_len, remaining_len, offset; 875 876 rqstp->rq_splice_ok = 0; 877 878 priv_len = svc_getnl(&buf->head[0]); 879 if (rqstp->rq_deferred) { 880 /* Already decrypted last time through! The sequence number 881 * check at out_seq is unnecessary but harmless: */ 882 goto out_seq; 883 } 884 /* buf->len is the number of bytes from the original start of the 885 * request to the end, where head[0].iov_len is just the bytes 886 * not yet read from the head, so these two values are different: */ 887 remaining_len = total_buf_len(buf); 888 if (priv_len > remaining_len) 889 return -EINVAL; 890 pad = remaining_len - priv_len; 891 buf->len -= pad; 892 fix_priv_head(buf, pad); 893 894 /* Maybe it would be better to give gss_unwrap a length parameter: */ 895 saved_len = buf->len; 896 buf->len = priv_len; 897 maj_stat = gss_unwrap(ctx, 0, buf); 898 pad = priv_len - buf->len; 899 buf->len = saved_len; 900 buf->len -= pad; 901 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 902 * In the krb5p case, at least, the data ends up offset, so we need to 903 * move it around. */ 904 /* XXX: This is very inefficient. It would be better to either do 905 * this while we encrypt, or maybe in the receive code, if we can peak 906 * ahead and work out the service and mechanism there. */ 907 offset = buf->head[0].iov_len % 4; 908 if (offset) { 909 buf->buflen = RPCSVC_MAXPAYLOAD; 910 xdr_shift_buf(buf, offset); 911 fix_priv_head(buf, pad); 912 } 913 if (maj_stat != GSS_S_COMPLETE) 914 return -EINVAL; 915 out_seq: 916 if (svc_getnl(&buf->head[0]) != seq) 917 return -EINVAL; 918 return 0; 919 } 920 921 struct gss_svc_data { 922 /* decoded gss client cred: */ 923 struct rpc_gss_wire_cred clcred; 924 /* save a pointer to the beginning of the encoded verifier, 925 * for use in encryption/checksumming in svcauth_gss_release: */ 926 __be32 *verf_start; 927 struct rsc *rsci; 928 }; 929 930 char *svc_gss_principal(struct svc_rqst *rqstp) 931 { 932 struct gss_svc_data *gd = (struct gss_svc_data *)rqstp->rq_auth_data; 933 934 if (gd && gd->rsci) 935 return gd->rsci->client_name; 936 return NULL; 937 } 938 EXPORT_SYMBOL_GPL(svc_gss_principal); 939 940 static int 941 svcauth_gss_set_client(struct svc_rqst *rqstp) 942 { 943 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 944 struct rsc *rsci = svcdata->rsci; 945 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 946 int stat; 947 948 /* 949 * A gss export can be specified either by: 950 * export *(sec=krb5,rw) 951 * or by 952 * export gss/krb5(rw) 953 * The latter is deprecated; but for backwards compatibility reasons 954 * the nfsd code will still fall back on trying it if the former 955 * doesn't work; so we try to make both available to nfsd, below. 956 */ 957 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 958 if (rqstp->rq_gssclient == NULL) 959 return SVC_DENIED; 960 stat = svcauth_unix_set_client(rqstp); 961 if (stat == SVC_DROP || stat == SVC_CLOSE) 962 return stat; 963 return SVC_OK; 964 } 965 966 static inline int 967 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, 968 struct xdr_netobj *out_handle, int *major_status) 969 { 970 struct rsc *rsci; 971 int rc; 972 973 if (*major_status != GSS_S_COMPLETE) 974 return gss_write_null_verf(rqstp); 975 rsci = gss_svc_searchbyctx(cd, out_handle); 976 if (rsci == NULL) { 977 *major_status = GSS_S_NO_CONTEXT; 978 return gss_write_null_verf(rqstp); 979 } 980 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 981 cache_put(&rsci->h, cd); 982 return rc; 983 } 984 985 static inline int 986 gss_read_verf(struct rpc_gss_wire_cred *gc, 987 struct kvec *argv, __be32 *authp, 988 struct xdr_netobj *in_handle, 989 struct xdr_netobj *in_token) 990 { 991 struct xdr_netobj tmpobj; 992 993 /* Read the verifier; should be NULL: */ 994 *authp = rpc_autherr_badverf; 995 if (argv->iov_len < 2 * 4) 996 return SVC_DENIED; 997 if (svc_getnl(argv) != RPC_AUTH_NULL) 998 return SVC_DENIED; 999 if (svc_getnl(argv) != 0) 1000 return SVC_DENIED; 1001 /* Martial context handle and token for upcall: */ 1002 *authp = rpc_autherr_badcred; 1003 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 1004 return SVC_DENIED; 1005 if (dup_netobj(in_handle, &gc->gc_ctx)) 1006 return SVC_CLOSE; 1007 *authp = rpc_autherr_badverf; 1008 if (svc_safe_getnetobj(argv, &tmpobj)) { 1009 kfree(in_handle->data); 1010 return SVC_DENIED; 1011 } 1012 if (dup_netobj(in_token, &tmpobj)) { 1013 kfree(in_handle->data); 1014 return SVC_CLOSE; 1015 } 1016 1017 return 0; 1018 } 1019 1020 static inline int 1021 gss_write_resv(struct kvec *resv, size_t size_limit, 1022 struct xdr_netobj *out_handle, struct xdr_netobj *out_token, 1023 int major_status, int minor_status) 1024 { 1025 if (resv->iov_len + 4 > size_limit) 1026 return -1; 1027 svc_putnl(resv, RPC_SUCCESS); 1028 if (svc_safe_putnetobj(resv, out_handle)) 1029 return -1; 1030 if (resv->iov_len + 3 * 4 > size_limit) 1031 return -1; 1032 svc_putnl(resv, major_status); 1033 svc_putnl(resv, minor_status); 1034 svc_putnl(resv, GSS_SEQ_WIN); 1035 if (svc_safe_putnetobj(resv, out_token)) 1036 return -1; 1037 return 0; 1038 } 1039 1040 /* 1041 * Having read the cred already and found we're in the context 1042 * initiation case, read the verifier and initiate (or check the results 1043 * of) upcalls to userspace for help with context initiation. If 1044 * the upcall results are available, write the verifier and result. 1045 * Otherwise, drop the request pending an answer to the upcall. 1046 */ 1047 static int svcauth_gss_handle_init(struct svc_rqst *rqstp, 1048 struct rpc_gss_wire_cred *gc, __be32 *authp) 1049 { 1050 struct kvec *argv = &rqstp->rq_arg.head[0]; 1051 struct kvec *resv = &rqstp->rq_res.head[0]; 1052 struct rsi *rsip, rsikey; 1053 int ret; 1054 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1055 1056 memset(&rsikey, 0, sizeof(rsikey)); 1057 ret = gss_read_verf(gc, argv, authp, 1058 &rsikey.in_handle, &rsikey.in_token); 1059 if (ret) 1060 return ret; 1061 1062 /* Perform upcall, or find upcall result: */ 1063 rsip = rsi_lookup(sn->rsi_cache, &rsikey); 1064 rsi_free(&rsikey); 1065 if (!rsip) 1066 return SVC_CLOSE; 1067 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 1068 /* No upcall result: */ 1069 return SVC_CLOSE; 1070 1071 ret = SVC_CLOSE; 1072 /* Got an answer to the upcall; use it: */ 1073 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1074 &rsip->out_handle, &rsip->major_status)) 1075 goto out; 1076 if (gss_write_resv(resv, PAGE_SIZE, 1077 &rsip->out_handle, &rsip->out_token, 1078 rsip->major_status, rsip->minor_status)) 1079 goto out; 1080 1081 ret = SVC_COMPLETE; 1082 out: 1083 cache_put(&rsip->h, sn->rsi_cache); 1084 return ret; 1085 } 1086 1087 /* 1088 * Accept an rpcsec packet. 1089 * If context establishment, punt to user space 1090 * If data exchange, verify/decrypt 1091 * If context destruction, handle here 1092 * In the context establishment and destruction case we encode 1093 * response here and return SVC_COMPLETE. 1094 */ 1095 static int 1096 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 1097 { 1098 struct kvec *argv = &rqstp->rq_arg.head[0]; 1099 struct kvec *resv = &rqstp->rq_res.head[0]; 1100 u32 crlen; 1101 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1102 struct rpc_gss_wire_cred *gc; 1103 struct rsc *rsci = NULL; 1104 __be32 *rpcstart; 1105 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1106 int ret; 1107 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1108 1109 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 1110 argv->iov_len); 1111 1112 *authp = rpc_autherr_badcred; 1113 if (!svcdata) 1114 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1115 if (!svcdata) 1116 goto auth_err; 1117 rqstp->rq_auth_data = svcdata; 1118 svcdata->verf_start = NULL; 1119 svcdata->rsci = NULL; 1120 gc = &svcdata->clcred; 1121 1122 /* start of rpc packet is 7 u32's back from here: 1123 * xid direction rpcversion prog vers proc flavour 1124 */ 1125 rpcstart = argv->iov_base; 1126 rpcstart -= 7; 1127 1128 /* credential is: 1129 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1130 * at least 5 u32s, and is preceded by length, so that makes 6. 1131 */ 1132 1133 if (argv->iov_len < 5 * 4) 1134 goto auth_err; 1135 crlen = svc_getnl(argv); 1136 if (svc_getnl(argv) != RPC_GSS_VERSION) 1137 goto auth_err; 1138 gc->gc_proc = svc_getnl(argv); 1139 gc->gc_seq = svc_getnl(argv); 1140 gc->gc_svc = svc_getnl(argv); 1141 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1142 goto auth_err; 1143 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1144 goto auth_err; 1145 1146 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1147 goto auth_err; 1148 1149 *authp = rpc_autherr_badverf; 1150 switch (gc->gc_proc) { 1151 case RPC_GSS_PROC_INIT: 1152 case RPC_GSS_PROC_CONTINUE_INIT: 1153 return svcauth_gss_handle_init(rqstp, gc, authp); 1154 case RPC_GSS_PROC_DATA: 1155 case RPC_GSS_PROC_DESTROY: 1156 /* Look up the context, and check the verifier: */ 1157 *authp = rpcsec_gsserr_credproblem; 1158 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 1159 if (!rsci) 1160 goto auth_err; 1161 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1162 case SVC_OK: 1163 break; 1164 case SVC_DENIED: 1165 goto auth_err; 1166 case SVC_DROP: 1167 goto drop; 1168 } 1169 break; 1170 default: 1171 *authp = rpc_autherr_rejectedcred; 1172 goto auth_err; 1173 } 1174 1175 /* now act upon the command: */ 1176 switch (gc->gc_proc) { 1177 case RPC_GSS_PROC_DESTROY: 1178 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1179 goto auth_err; 1180 rsci->h.expiry_time = get_seconds(); 1181 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1182 if (resv->iov_len + 4 > PAGE_SIZE) 1183 goto drop; 1184 svc_putnl(resv, RPC_SUCCESS); 1185 goto complete; 1186 case RPC_GSS_PROC_DATA: 1187 *authp = rpcsec_gsserr_ctxproblem; 1188 svcdata->verf_start = resv->iov_base + resv->iov_len; 1189 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1190 goto auth_err; 1191 rqstp->rq_cred = rsci->cred; 1192 get_group_info(rsci->cred.cr_group_info); 1193 *authp = rpc_autherr_badcred; 1194 switch (gc->gc_svc) { 1195 case RPC_GSS_SVC_NONE: 1196 break; 1197 case RPC_GSS_SVC_INTEGRITY: 1198 /* placeholders for length and seq. number: */ 1199 svc_putnl(resv, 0); 1200 svc_putnl(resv, 0); 1201 if (unwrap_integ_data(&rqstp->rq_arg, 1202 gc->gc_seq, rsci->mechctx)) 1203 goto garbage_args; 1204 break; 1205 case RPC_GSS_SVC_PRIVACY: 1206 /* placeholders for length and seq. number: */ 1207 svc_putnl(resv, 0); 1208 svc_putnl(resv, 0); 1209 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1210 gc->gc_seq, rsci->mechctx)) 1211 goto garbage_args; 1212 break; 1213 default: 1214 goto auth_err; 1215 } 1216 svcdata->rsci = rsci; 1217 cache_get(&rsci->h); 1218 rqstp->rq_flavor = gss_svc_to_pseudoflavor( 1219 rsci->mechctx->mech_type, gc->gc_svc); 1220 ret = SVC_OK; 1221 goto out; 1222 } 1223 garbage_args: 1224 ret = SVC_GARBAGE; 1225 goto out; 1226 auth_err: 1227 /* Restore write pointer to its original value: */ 1228 xdr_ressize_check(rqstp, reject_stat); 1229 ret = SVC_DENIED; 1230 goto out; 1231 complete: 1232 ret = SVC_COMPLETE; 1233 goto out; 1234 drop: 1235 ret = SVC_DROP; 1236 out: 1237 if (rsci) 1238 cache_put(&rsci->h, sn->rsc_cache); 1239 return ret; 1240 } 1241 1242 static __be32 * 1243 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1244 { 1245 __be32 *p; 1246 u32 verf_len; 1247 1248 p = gsd->verf_start; 1249 gsd->verf_start = NULL; 1250 1251 /* If the reply stat is nonzero, don't wrap: */ 1252 if (*(p-1) != rpc_success) 1253 return NULL; 1254 /* Skip the verifier: */ 1255 p += 1; 1256 verf_len = ntohl(*p++); 1257 p += XDR_QUADLEN(verf_len); 1258 /* move accept_stat to right place: */ 1259 memcpy(p, p + 2, 4); 1260 /* Also don't wrap if the accept stat is nonzero: */ 1261 if (*p != rpc_success) { 1262 resbuf->head[0].iov_len -= 2 * 4; 1263 return NULL; 1264 } 1265 p++; 1266 return p; 1267 } 1268 1269 static inline int 1270 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1271 { 1272 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1273 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1274 struct xdr_buf *resbuf = &rqstp->rq_res; 1275 struct xdr_buf integ_buf; 1276 struct xdr_netobj mic; 1277 struct kvec *resv; 1278 __be32 *p; 1279 int integ_offset, integ_len; 1280 int stat = -EINVAL; 1281 1282 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1283 if (p == NULL) 1284 goto out; 1285 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1286 integ_len = resbuf->len - integ_offset; 1287 BUG_ON(integ_len % 4); 1288 *p++ = htonl(integ_len); 1289 *p++ = htonl(gc->gc_seq); 1290 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1291 integ_len)) 1292 BUG(); 1293 if (resbuf->tail[0].iov_base == NULL) { 1294 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1295 goto out_err; 1296 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1297 + resbuf->head[0].iov_len; 1298 resbuf->tail[0].iov_len = 0; 1299 resv = &resbuf->tail[0]; 1300 } else { 1301 resv = &resbuf->tail[0]; 1302 } 1303 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1304 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1305 goto out_err; 1306 svc_putnl(resv, mic.len); 1307 memset(mic.data + mic.len, 0, 1308 round_up_to_quad(mic.len) - mic.len); 1309 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1310 /* not strictly required: */ 1311 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1312 BUG_ON(resv->iov_len > PAGE_SIZE); 1313 out: 1314 stat = 0; 1315 out_err: 1316 return stat; 1317 } 1318 1319 static inline int 1320 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1321 { 1322 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1323 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1324 struct xdr_buf *resbuf = &rqstp->rq_res; 1325 struct page **inpages = NULL; 1326 __be32 *p, *len; 1327 int offset; 1328 int pad; 1329 1330 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1331 if (p == NULL) 1332 return 0; 1333 len = p++; 1334 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1335 *p++ = htonl(gc->gc_seq); 1336 inpages = resbuf->pages; 1337 /* XXX: Would be better to write some xdr helper functions for 1338 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1339 1340 /* 1341 * If there is currently tail data, make sure there is 1342 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1343 * the page, and move the current tail data such that 1344 * there is RPC_MAX_AUTH_SIZE slack space available in 1345 * both the head and tail. 1346 */ 1347 if (resbuf->tail[0].iov_base) { 1348 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1349 + PAGE_SIZE); 1350 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1351 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1352 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1353 return -ENOMEM; 1354 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1355 resbuf->tail[0].iov_base, 1356 resbuf->tail[0].iov_len); 1357 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1358 } 1359 /* 1360 * If there is no current tail data, make sure there is 1361 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1362 * allotted page, and set up tail information such that there 1363 * is RPC_MAX_AUTH_SIZE slack space available in both the 1364 * head and tail. 1365 */ 1366 if (resbuf->tail[0].iov_base == NULL) { 1367 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1368 return -ENOMEM; 1369 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1370 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1371 resbuf->tail[0].iov_len = 0; 1372 } 1373 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1374 return -ENOMEM; 1375 *len = htonl(resbuf->len - offset); 1376 pad = 3 - ((resbuf->len - offset - 1)&3); 1377 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1378 memset(p, 0, pad); 1379 resbuf->tail[0].iov_len += pad; 1380 resbuf->len += pad; 1381 return 0; 1382 } 1383 1384 static int 1385 svcauth_gss_release(struct svc_rqst *rqstp) 1386 { 1387 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1388 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1389 struct xdr_buf *resbuf = &rqstp->rq_res; 1390 int stat = -EINVAL; 1391 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1392 1393 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1394 goto out; 1395 /* Release can be called twice, but we only wrap once. */ 1396 if (gsd->verf_start == NULL) 1397 goto out; 1398 /* normally not set till svc_send, but we need it here: */ 1399 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1400 * or whatever? */ 1401 resbuf->len = total_buf_len(resbuf); 1402 switch (gc->gc_svc) { 1403 case RPC_GSS_SVC_NONE: 1404 break; 1405 case RPC_GSS_SVC_INTEGRITY: 1406 stat = svcauth_gss_wrap_resp_integ(rqstp); 1407 if (stat) 1408 goto out_err; 1409 break; 1410 case RPC_GSS_SVC_PRIVACY: 1411 stat = svcauth_gss_wrap_resp_priv(rqstp); 1412 if (stat) 1413 goto out_err; 1414 break; 1415 /* 1416 * For any other gc_svc value, svcauth_gss_accept() already set 1417 * the auth_error appropriately; just fall through: 1418 */ 1419 } 1420 1421 out: 1422 stat = 0; 1423 out_err: 1424 if (rqstp->rq_client) 1425 auth_domain_put(rqstp->rq_client); 1426 rqstp->rq_client = NULL; 1427 if (rqstp->rq_gssclient) 1428 auth_domain_put(rqstp->rq_gssclient); 1429 rqstp->rq_gssclient = NULL; 1430 if (rqstp->rq_cred.cr_group_info) 1431 put_group_info(rqstp->rq_cred.cr_group_info); 1432 rqstp->rq_cred.cr_group_info = NULL; 1433 if (gsd->rsci) 1434 cache_put(&gsd->rsci->h, sn->rsc_cache); 1435 gsd->rsci = NULL; 1436 1437 return stat; 1438 } 1439 1440 static void 1441 svcauth_gss_domain_release(struct auth_domain *dom) 1442 { 1443 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1444 1445 kfree(dom->name); 1446 kfree(gd); 1447 } 1448 1449 static struct auth_ops svcauthops_gss = { 1450 .name = "rpcsec_gss", 1451 .owner = THIS_MODULE, 1452 .flavour = RPC_AUTH_GSS, 1453 .accept = svcauth_gss_accept, 1454 .release = svcauth_gss_release, 1455 .domain_release = svcauth_gss_domain_release, 1456 .set_client = svcauth_gss_set_client, 1457 }; 1458 1459 static int rsi_cache_create_net(struct net *net) 1460 { 1461 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1462 struct cache_detail *cd; 1463 int err; 1464 1465 cd = cache_create_net(&rsi_cache_template, net); 1466 if (IS_ERR(cd)) 1467 return PTR_ERR(cd); 1468 err = cache_register_net(cd, net); 1469 if (err) { 1470 cache_destroy_net(cd, net); 1471 return err; 1472 } 1473 sn->rsi_cache = cd; 1474 return 0; 1475 } 1476 1477 static void rsi_cache_destroy_net(struct net *net) 1478 { 1479 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1480 struct cache_detail *cd = sn->rsi_cache; 1481 1482 sn->rsi_cache = NULL; 1483 cache_purge(cd); 1484 cache_unregister_net(cd, net); 1485 cache_destroy_net(cd, net); 1486 } 1487 1488 static int rsc_cache_create_net(struct net *net) 1489 { 1490 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1491 struct cache_detail *cd; 1492 int err; 1493 1494 cd = cache_create_net(&rsc_cache_template, net); 1495 if (IS_ERR(cd)) 1496 return PTR_ERR(cd); 1497 err = cache_register_net(cd, net); 1498 if (err) { 1499 cache_destroy_net(cd, net); 1500 return err; 1501 } 1502 sn->rsc_cache = cd; 1503 return 0; 1504 } 1505 1506 static void rsc_cache_destroy_net(struct net *net) 1507 { 1508 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1509 struct cache_detail *cd = sn->rsc_cache; 1510 1511 sn->rsc_cache = NULL; 1512 cache_purge(cd); 1513 cache_unregister_net(cd, net); 1514 cache_destroy_net(cd, net); 1515 } 1516 1517 int 1518 gss_svc_init_net(struct net *net) 1519 { 1520 int rv; 1521 1522 rv = rsc_cache_create_net(net); 1523 if (rv) 1524 return rv; 1525 rv = rsi_cache_create_net(net); 1526 if (rv) 1527 goto out1; 1528 return 0; 1529 out1: 1530 rsc_cache_destroy_net(net); 1531 return rv; 1532 } 1533 1534 void 1535 gss_svc_shutdown_net(struct net *net) 1536 { 1537 rsi_cache_destroy_net(net); 1538 rsc_cache_destroy_net(net); 1539 } 1540 1541 int 1542 gss_svc_init(void) 1543 { 1544 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1545 } 1546 1547 void 1548 gss_svc_shutdown(void) 1549 { 1550 svc_auth_unregister(RPC_AUTH_GSS); 1551 } 1552