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 #include <linux/user_namespace.h> 45 46 #include <linux/sunrpc/auth_gss.h> 47 #include <linux/sunrpc/gss_err.h> 48 #include <linux/sunrpc/svcauth.h> 49 #include <linux/sunrpc/svcauth_gss.h> 50 #include <linux/sunrpc/cache.h> 51 52 #include "../netns.h" 53 54 #ifdef RPC_DEBUG 55 # define RPCDBG_FACILITY RPCDBG_AUTH 56 #endif 57 58 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests 59 * into replies. 60 * 61 * Key is context handle (\x if empty) and gss_token. 62 * Content is major_status minor_status (integers) context_handle, reply_token. 63 * 64 */ 65 66 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) 67 { 68 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); 69 } 70 71 #define RSI_HASHBITS 6 72 #define RSI_HASHMAX (1<<RSI_HASHBITS) 73 74 struct rsi { 75 struct cache_head h; 76 struct xdr_netobj in_handle, in_token; 77 struct xdr_netobj out_handle, out_token; 78 int major_status, minor_status; 79 }; 80 81 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old); 82 static struct rsi *rsi_lookup(struct cache_detail *cd, 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(cd, &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(cd, &rsii, rsip); 263 status = 0; 264 out: 265 rsi_free(&rsii); 266 if (rsip) 267 cache_put(&rsip->h, cd); 268 else 269 status = -ENOMEM; 270 return status; 271 } 272 273 static struct cache_detail rsi_cache_template = { 274 .owner = THIS_MODULE, 275 .hash_size = RSI_HASHMAX, 276 .name = "auth.rpcsec.init", 277 .cache_put = rsi_put, 278 .cache_upcall = rsi_upcall, 279 .cache_parse = rsi_parse, 280 .match = rsi_match, 281 .init = rsi_init, 282 .update = update_rsi, 283 .alloc = rsi_alloc, 284 }; 285 286 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item) 287 { 288 struct cache_head *ch; 289 int hash = rsi_hash(item); 290 291 ch = sunrpc_cache_lookup(cd, &item->h, hash); 292 if (ch) 293 return container_of(ch, struct rsi, h); 294 else 295 return NULL; 296 } 297 298 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old) 299 { 300 struct cache_head *ch; 301 int hash = rsi_hash(new); 302 303 ch = sunrpc_cache_update(cd, &new->h, 304 &old->h, hash); 305 if (ch) 306 return container_of(ch, struct rsi, h); 307 else 308 return NULL; 309 } 310 311 312 /* 313 * The rpcsec_context cache is used to store a context that is 314 * used in data exchange. 315 * The key is a context handle. The content is: 316 * uid, gidlist, mechanism, service-set, mech-specific-data 317 */ 318 319 #define RSC_HASHBITS 10 320 #define RSC_HASHMAX (1<<RSC_HASHBITS) 321 322 #define GSS_SEQ_WIN 128 323 324 struct gss_svc_seq_data { 325 /* highest seq number seen so far: */ 326 int sd_max; 327 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 328 * sd_win is nonzero iff sequence number i has been seen already: */ 329 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 330 spinlock_t sd_lock; 331 }; 332 333 struct rsc { 334 struct cache_head h; 335 struct xdr_netobj handle; 336 struct svc_cred cred; 337 struct gss_svc_seq_data seqdata; 338 struct gss_ctx *mechctx; 339 char *client_name; 340 }; 341 342 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old); 343 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item); 344 345 static void rsc_free(struct rsc *rsci) 346 { 347 kfree(rsci->handle.data); 348 if (rsci->mechctx) 349 gss_delete_sec_context(&rsci->mechctx); 350 if (rsci->cred.cr_group_info) 351 put_group_info(rsci->cred.cr_group_info); 352 kfree(rsci->client_name); 353 } 354 355 static void rsc_put(struct kref *ref) 356 { 357 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 358 359 rsc_free(rsci); 360 kfree(rsci); 361 } 362 363 static inline int 364 rsc_hash(struct rsc *rsci) 365 { 366 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 367 } 368 369 static int 370 rsc_match(struct cache_head *a, struct cache_head *b) 371 { 372 struct rsc *new = container_of(a, struct rsc, h); 373 struct rsc *tmp = container_of(b, struct rsc, h); 374 375 return netobj_equal(&new->handle, &tmp->handle); 376 } 377 378 static void 379 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 380 { 381 struct rsc *new = container_of(cnew, struct rsc, h); 382 struct rsc *tmp = container_of(ctmp, struct rsc, h); 383 384 new->handle.len = tmp->handle.len; 385 tmp->handle.len = 0; 386 new->handle.data = tmp->handle.data; 387 tmp->handle.data = NULL; 388 new->mechctx = NULL; 389 new->cred.cr_group_info = NULL; 390 new->client_name = NULL; 391 } 392 393 static void 394 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 395 { 396 struct rsc *new = container_of(cnew, struct rsc, h); 397 struct rsc *tmp = container_of(ctmp, struct rsc, h); 398 399 new->mechctx = tmp->mechctx; 400 tmp->mechctx = NULL; 401 memset(&new->seqdata, 0, sizeof(new->seqdata)); 402 spin_lock_init(&new->seqdata.sd_lock); 403 new->cred = tmp->cred; 404 tmp->cred.cr_group_info = NULL; 405 new->client_name = tmp->client_name; 406 tmp->client_name = NULL; 407 } 408 409 static struct cache_head * 410 rsc_alloc(void) 411 { 412 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 413 if (rsci) 414 return &rsci->h; 415 else 416 return NULL; 417 } 418 419 static int rsc_parse(struct cache_detail *cd, 420 char *mesg, int mlen) 421 { 422 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 423 char *buf = mesg; 424 int len, rv; 425 struct rsc rsci, *rscp = NULL; 426 time_t expiry; 427 int status = -EINVAL; 428 struct gss_api_mech *gm = NULL; 429 430 memset(&rsci, 0, sizeof(rsci)); 431 /* context handle */ 432 len = qword_get(&mesg, buf, mlen); 433 if (len < 0) goto out; 434 status = -ENOMEM; 435 if (dup_to_netobj(&rsci.handle, buf, len)) 436 goto out; 437 438 rsci.h.flags = 0; 439 /* expiry */ 440 expiry = get_expiry(&mesg); 441 status = -EINVAL; 442 if (expiry == 0) 443 goto out; 444 445 rscp = rsc_lookup(cd, &rsci); 446 if (!rscp) 447 goto out; 448 449 /* uid, or NEGATIVE */ 450 rv = get_int(&mesg, &rsci.cred.cr_uid); 451 if (rv == -EINVAL) 452 goto out; 453 if (rv == -ENOENT) 454 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 455 else { 456 int N, i; 457 458 /* gid */ 459 if (get_int(&mesg, &rsci.cred.cr_gid)) 460 goto out; 461 462 /* number of additional gid's */ 463 if (get_int(&mesg, &N)) 464 goto out; 465 status = -ENOMEM; 466 rsci.cred.cr_group_info = groups_alloc(N); 467 if (rsci.cred.cr_group_info == NULL) 468 goto out; 469 470 /* gid's */ 471 status = -EINVAL; 472 for (i=0; i<N; i++) { 473 gid_t gid; 474 kgid_t kgid; 475 if (get_int(&mesg, &gid)) 476 goto out; 477 kgid = make_kgid(&init_user_ns, gid); 478 if (!gid_valid(kgid)) 479 goto out; 480 GROUP_AT(rsci.cred.cr_group_info, i) = kgid; 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(cd, &rsci, rscp); 512 status = 0; 513 out: 514 gss_mech_put(gm); 515 rsc_free(&rsci); 516 if (rscp) 517 cache_put(&rscp->h, cd); 518 else 519 status = -ENOMEM; 520 return status; 521 } 522 523 static struct cache_detail rsc_cache_template = { 524 .owner = THIS_MODULE, 525 .hash_size = RSC_HASHMAX, 526 .name = "auth.rpcsec.context", 527 .cache_put = rsc_put, 528 .cache_parse = rsc_parse, 529 .match = rsc_match, 530 .init = rsc_init, 531 .update = update_rsc, 532 .alloc = rsc_alloc, 533 }; 534 535 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) 536 { 537 struct cache_head *ch; 538 int hash = rsc_hash(item); 539 540 ch = sunrpc_cache_lookup(cd, &item->h, hash); 541 if (ch) 542 return container_of(ch, struct rsc, h); 543 else 544 return NULL; 545 } 546 547 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) 548 { 549 struct cache_head *ch; 550 int hash = rsc_hash(new); 551 552 ch = sunrpc_cache_update(cd, &new->h, 553 &old->h, hash); 554 if (ch) 555 return container_of(ch, struct rsc, h); 556 else 557 return NULL; 558 } 559 560 561 static struct rsc * 562 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) 563 { 564 struct rsc rsci; 565 struct rsc *found; 566 567 memset(&rsci, 0, sizeof(rsci)); 568 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 569 return NULL; 570 found = rsc_lookup(cd, &rsci); 571 rsc_free(&rsci); 572 if (!found) 573 return NULL; 574 if (cache_check(cd, &found->h, NULL)) 575 return NULL; 576 return found; 577 } 578 579 /* Implements sequence number algorithm as specified in RFC 2203. */ 580 static int 581 gss_check_seq_num(struct rsc *rsci, int seq_num) 582 { 583 struct gss_svc_seq_data *sd = &rsci->seqdata; 584 585 spin_lock(&sd->sd_lock); 586 if (seq_num > sd->sd_max) { 587 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 588 memset(sd->sd_win,0,sizeof(sd->sd_win)); 589 sd->sd_max = seq_num; 590 } else while (sd->sd_max < seq_num) { 591 sd->sd_max++; 592 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 593 } 594 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 595 goto ok; 596 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 597 goto drop; 598 } 599 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 600 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 601 goto drop; 602 ok: 603 spin_unlock(&sd->sd_lock); 604 return 1; 605 drop: 606 spin_unlock(&sd->sd_lock); 607 return 0; 608 } 609 610 static inline u32 round_up_to_quad(u32 i) 611 { 612 return (i + 3 ) & ~3; 613 } 614 615 static inline int 616 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 617 { 618 int l; 619 620 if (argv->iov_len < 4) 621 return -1; 622 o->len = svc_getnl(argv); 623 l = round_up_to_quad(o->len); 624 if (argv->iov_len < l) 625 return -1; 626 o->data = argv->iov_base; 627 argv->iov_base += l; 628 argv->iov_len -= l; 629 return 0; 630 } 631 632 static inline int 633 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 634 { 635 u8 *p; 636 637 if (resv->iov_len + 4 > PAGE_SIZE) 638 return -1; 639 svc_putnl(resv, o->len); 640 p = resv->iov_base + resv->iov_len; 641 resv->iov_len += round_up_to_quad(o->len); 642 if (resv->iov_len > PAGE_SIZE) 643 return -1; 644 memcpy(p, o->data, o->len); 645 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 646 return 0; 647 } 648 649 /* 650 * Verify the checksum on the header and return SVC_OK on success. 651 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 652 * or return SVC_DENIED and indicate error in authp. 653 */ 654 static int 655 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 656 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 657 { 658 struct gss_ctx *ctx_id = rsci->mechctx; 659 struct xdr_buf rpchdr; 660 struct xdr_netobj checksum; 661 u32 flavor = 0; 662 struct kvec *argv = &rqstp->rq_arg.head[0]; 663 struct kvec iov; 664 665 /* data to compute the checksum over: */ 666 iov.iov_base = rpcstart; 667 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 668 xdr_buf_from_iov(&iov, &rpchdr); 669 670 *authp = rpc_autherr_badverf; 671 if (argv->iov_len < 4) 672 return SVC_DENIED; 673 flavor = svc_getnl(argv); 674 if (flavor != RPC_AUTH_GSS) 675 return SVC_DENIED; 676 if (svc_safe_getnetobj(argv, &checksum)) 677 return SVC_DENIED; 678 679 if (rqstp->rq_deferred) /* skip verification of revisited request */ 680 return SVC_OK; 681 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 682 *authp = rpcsec_gsserr_credproblem; 683 return SVC_DENIED; 684 } 685 686 if (gc->gc_seq > MAXSEQ) { 687 dprintk("RPC: svcauth_gss: discarding request with " 688 "large sequence number %d\n", gc->gc_seq); 689 *authp = rpcsec_gsserr_ctxproblem; 690 return SVC_DENIED; 691 } 692 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 693 dprintk("RPC: svcauth_gss: discarding request with " 694 "old sequence number %d\n", gc->gc_seq); 695 return SVC_DROP; 696 } 697 return SVC_OK; 698 } 699 700 static int 701 gss_write_null_verf(struct svc_rqst *rqstp) 702 { 703 __be32 *p; 704 705 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 706 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 707 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 708 *p++ = 0; 709 if (!xdr_ressize_check(rqstp, p)) 710 return -1; 711 return 0; 712 } 713 714 static int 715 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 716 { 717 __be32 xdr_seq; 718 u32 maj_stat; 719 struct xdr_buf verf_data; 720 struct xdr_netobj mic; 721 __be32 *p; 722 struct kvec iov; 723 724 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 725 xdr_seq = htonl(seq); 726 727 iov.iov_base = &xdr_seq; 728 iov.iov_len = sizeof(xdr_seq); 729 xdr_buf_from_iov(&iov, &verf_data); 730 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 731 mic.data = (u8 *)(p + 1); 732 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 733 if (maj_stat != GSS_S_COMPLETE) 734 return -1; 735 *p++ = htonl(mic.len); 736 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 737 p += XDR_QUADLEN(mic.len); 738 if (!xdr_ressize_check(rqstp, p)) 739 return -1; 740 return 0; 741 } 742 743 struct gss_domain { 744 struct auth_domain h; 745 u32 pseudoflavor; 746 }; 747 748 static struct auth_domain * 749 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 750 { 751 char *name; 752 753 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 754 if (!name) 755 return NULL; 756 return auth_domain_find(name); 757 } 758 759 static struct auth_ops svcauthops_gss; 760 761 u32 svcauth_gss_flavor(struct auth_domain *dom) 762 { 763 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 764 765 return gd->pseudoflavor; 766 } 767 768 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 769 770 int 771 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 772 { 773 struct gss_domain *new; 774 struct auth_domain *test; 775 int stat = -ENOMEM; 776 777 new = kmalloc(sizeof(*new), GFP_KERNEL); 778 if (!new) 779 goto out; 780 kref_init(&new->h.ref); 781 new->h.name = kstrdup(name, GFP_KERNEL); 782 if (!new->h.name) 783 goto out_free_dom; 784 new->h.flavour = &svcauthops_gss; 785 new->pseudoflavor = pseudoflavor; 786 787 stat = 0; 788 test = auth_domain_lookup(name, &new->h); 789 if (test != &new->h) { /* Duplicate registration */ 790 auth_domain_put(test); 791 kfree(new->h.name); 792 goto out_free_dom; 793 } 794 return 0; 795 796 out_free_dom: 797 kfree(new); 798 out: 799 return stat; 800 } 801 802 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 803 804 static inline int 805 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 806 { 807 __be32 raw; 808 int status; 809 810 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 811 if (status) 812 return status; 813 *obj = ntohl(raw); 814 return 0; 815 } 816 817 /* It would be nice if this bit of code could be shared with the client. 818 * Obstacles: 819 * The client shouldn't malloc(), would have to pass in own memory. 820 * The server uses base of head iovec as read pointer, while the 821 * client uses separate pointer. */ 822 static int 823 unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 824 { 825 int stat = -EINVAL; 826 u32 integ_len, maj_stat; 827 struct xdr_netobj mic; 828 struct xdr_buf integ_buf; 829 830 integ_len = svc_getnl(&buf->head[0]); 831 if (integ_len & 3) 832 return stat; 833 if (integ_len > buf->len) 834 return stat; 835 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 836 BUG(); 837 /* copy out mic... */ 838 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 839 BUG(); 840 if (mic.len > RPC_MAX_AUTH_SIZE) 841 return stat; 842 mic.data = kmalloc(mic.len, GFP_KERNEL); 843 if (!mic.data) 844 return stat; 845 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 846 goto out; 847 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 848 if (maj_stat != GSS_S_COMPLETE) 849 goto out; 850 if (svc_getnl(&buf->head[0]) != seq) 851 goto out; 852 stat = 0; 853 out: 854 kfree(mic.data); 855 return stat; 856 } 857 858 static inline int 859 total_buf_len(struct xdr_buf *buf) 860 { 861 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 862 } 863 864 static void 865 fix_priv_head(struct xdr_buf *buf, int pad) 866 { 867 if (buf->page_len == 0) { 868 /* We need to adjust head and buf->len in tandem in this 869 * case to make svc_defer() work--it finds the original 870 * buffer start using buf->len - buf->head[0].iov_len. */ 871 buf->head[0].iov_len -= pad; 872 } 873 } 874 875 static int 876 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 877 { 878 u32 priv_len, maj_stat; 879 int pad, saved_len, remaining_len, offset; 880 881 rqstp->rq_splice_ok = 0; 882 883 priv_len = svc_getnl(&buf->head[0]); 884 if (rqstp->rq_deferred) { 885 /* Already decrypted last time through! The sequence number 886 * check at out_seq is unnecessary but harmless: */ 887 goto out_seq; 888 } 889 /* buf->len is the number of bytes from the original start of the 890 * request to the end, where head[0].iov_len is just the bytes 891 * not yet read from the head, so these two values are different: */ 892 remaining_len = total_buf_len(buf); 893 if (priv_len > remaining_len) 894 return -EINVAL; 895 pad = remaining_len - priv_len; 896 buf->len -= pad; 897 fix_priv_head(buf, pad); 898 899 /* Maybe it would be better to give gss_unwrap a length parameter: */ 900 saved_len = buf->len; 901 buf->len = priv_len; 902 maj_stat = gss_unwrap(ctx, 0, buf); 903 pad = priv_len - buf->len; 904 buf->len = saved_len; 905 buf->len -= pad; 906 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 907 * In the krb5p case, at least, the data ends up offset, so we need to 908 * move it around. */ 909 /* XXX: This is very inefficient. It would be better to either do 910 * this while we encrypt, or maybe in the receive code, if we can peak 911 * ahead and work out the service and mechanism there. */ 912 offset = buf->head[0].iov_len % 4; 913 if (offset) { 914 buf->buflen = RPCSVC_MAXPAYLOAD; 915 xdr_shift_buf(buf, offset); 916 fix_priv_head(buf, pad); 917 } 918 if (maj_stat != GSS_S_COMPLETE) 919 return -EINVAL; 920 out_seq: 921 if (svc_getnl(&buf->head[0]) != seq) 922 return -EINVAL; 923 return 0; 924 } 925 926 struct gss_svc_data { 927 /* decoded gss client cred: */ 928 struct rpc_gss_wire_cred clcred; 929 /* save a pointer to the beginning of the encoded verifier, 930 * for use in encryption/checksumming in svcauth_gss_release: */ 931 __be32 *verf_start; 932 struct rsc *rsci; 933 }; 934 935 char *svc_gss_principal(struct svc_rqst *rqstp) 936 { 937 struct gss_svc_data *gd = (struct gss_svc_data *)rqstp->rq_auth_data; 938 939 if (gd && gd->rsci) 940 return gd->rsci->client_name; 941 return NULL; 942 } 943 EXPORT_SYMBOL_GPL(svc_gss_principal); 944 945 static int 946 svcauth_gss_set_client(struct svc_rqst *rqstp) 947 { 948 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 949 struct rsc *rsci = svcdata->rsci; 950 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 951 int stat; 952 953 /* 954 * A gss export can be specified either by: 955 * export *(sec=krb5,rw) 956 * or by 957 * export gss/krb5(rw) 958 * The latter is deprecated; but for backwards compatibility reasons 959 * the nfsd code will still fall back on trying it if the former 960 * doesn't work; so we try to make both available to nfsd, below. 961 */ 962 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 963 if (rqstp->rq_gssclient == NULL) 964 return SVC_DENIED; 965 stat = svcauth_unix_set_client(rqstp); 966 if (stat == SVC_DROP || stat == SVC_CLOSE) 967 return stat; 968 return SVC_OK; 969 } 970 971 static inline int 972 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, struct rsi *rsip) 973 { 974 struct rsc *rsci; 975 int rc; 976 977 if (rsip->major_status != GSS_S_COMPLETE) 978 return gss_write_null_verf(rqstp); 979 rsci = gss_svc_searchbyctx(cd, &rsip->out_handle); 980 if (rsci == NULL) { 981 rsip->major_status = GSS_S_NO_CONTEXT; 982 return gss_write_null_verf(rqstp); 983 } 984 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 985 cache_put(&rsci->h, cd); 986 return rc; 987 } 988 989 /* 990 * Having read the cred already and found we're in the context 991 * initiation case, read the verifier and initiate (or check the results 992 * of) upcalls to userspace for help with context initiation. If 993 * the upcall results are available, write the verifier and result. 994 * Otherwise, drop the request pending an answer to the upcall. 995 */ 996 static int svcauth_gss_handle_init(struct svc_rqst *rqstp, 997 struct rpc_gss_wire_cred *gc, __be32 *authp) 998 { 999 struct kvec *argv = &rqstp->rq_arg.head[0]; 1000 struct kvec *resv = &rqstp->rq_res.head[0]; 1001 struct xdr_netobj tmpobj; 1002 struct rsi *rsip, rsikey; 1003 int ret; 1004 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 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(sn->rsi_cache, &rsikey); 1034 rsi_free(&rsikey); 1035 if (!rsip) 1036 return SVC_CLOSE; 1037 if (cache_check(sn->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(sn->rsc_cache, 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, sn->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 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1085 1086 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 1087 argv->iov_len); 1088 1089 *authp = rpc_autherr_badcred; 1090 if (!svcdata) 1091 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1092 if (!svcdata) 1093 goto auth_err; 1094 rqstp->rq_auth_data = svcdata; 1095 svcdata->verf_start = NULL; 1096 svcdata->rsci = NULL; 1097 gc = &svcdata->clcred; 1098 1099 /* start of rpc packet is 7 u32's back from here: 1100 * xid direction rpcversion prog vers proc flavour 1101 */ 1102 rpcstart = argv->iov_base; 1103 rpcstart -= 7; 1104 1105 /* credential is: 1106 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1107 * at least 5 u32s, and is preceded by length, so that makes 6. 1108 */ 1109 1110 if (argv->iov_len < 5 * 4) 1111 goto auth_err; 1112 crlen = svc_getnl(argv); 1113 if (svc_getnl(argv) != RPC_GSS_VERSION) 1114 goto auth_err; 1115 gc->gc_proc = svc_getnl(argv); 1116 gc->gc_seq = svc_getnl(argv); 1117 gc->gc_svc = svc_getnl(argv); 1118 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1119 goto auth_err; 1120 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1121 goto auth_err; 1122 1123 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1124 goto auth_err; 1125 1126 *authp = rpc_autherr_badverf; 1127 switch (gc->gc_proc) { 1128 case RPC_GSS_PROC_INIT: 1129 case RPC_GSS_PROC_CONTINUE_INIT: 1130 return svcauth_gss_handle_init(rqstp, gc, authp); 1131 case RPC_GSS_PROC_DATA: 1132 case RPC_GSS_PROC_DESTROY: 1133 /* Look up the context, and check the verifier: */ 1134 *authp = rpcsec_gsserr_credproblem; 1135 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 1136 if (!rsci) 1137 goto auth_err; 1138 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1139 case SVC_OK: 1140 break; 1141 case SVC_DENIED: 1142 goto auth_err; 1143 case SVC_DROP: 1144 goto drop; 1145 } 1146 break; 1147 default: 1148 *authp = rpc_autherr_rejectedcred; 1149 goto auth_err; 1150 } 1151 1152 /* now act upon the command: */ 1153 switch (gc->gc_proc) { 1154 case RPC_GSS_PROC_DESTROY: 1155 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1156 goto auth_err; 1157 rsci->h.expiry_time = get_seconds(); 1158 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1159 if (resv->iov_len + 4 > PAGE_SIZE) 1160 goto drop; 1161 svc_putnl(resv, RPC_SUCCESS); 1162 goto complete; 1163 case RPC_GSS_PROC_DATA: 1164 *authp = rpcsec_gsserr_ctxproblem; 1165 svcdata->verf_start = resv->iov_base + resv->iov_len; 1166 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1167 goto auth_err; 1168 rqstp->rq_cred = rsci->cred; 1169 get_group_info(rsci->cred.cr_group_info); 1170 *authp = rpc_autherr_badcred; 1171 switch (gc->gc_svc) { 1172 case RPC_GSS_SVC_NONE: 1173 break; 1174 case RPC_GSS_SVC_INTEGRITY: 1175 /* placeholders for length and seq. number: */ 1176 svc_putnl(resv, 0); 1177 svc_putnl(resv, 0); 1178 if (unwrap_integ_data(&rqstp->rq_arg, 1179 gc->gc_seq, rsci->mechctx)) 1180 goto garbage_args; 1181 break; 1182 case RPC_GSS_SVC_PRIVACY: 1183 /* placeholders for length and seq. number: */ 1184 svc_putnl(resv, 0); 1185 svc_putnl(resv, 0); 1186 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1187 gc->gc_seq, rsci->mechctx)) 1188 goto garbage_args; 1189 break; 1190 default: 1191 goto auth_err; 1192 } 1193 svcdata->rsci = rsci; 1194 cache_get(&rsci->h); 1195 rqstp->rq_flavor = gss_svc_to_pseudoflavor( 1196 rsci->mechctx->mech_type, gc->gc_svc); 1197 ret = SVC_OK; 1198 goto out; 1199 } 1200 garbage_args: 1201 ret = SVC_GARBAGE; 1202 goto out; 1203 auth_err: 1204 /* Restore write pointer to its original value: */ 1205 xdr_ressize_check(rqstp, reject_stat); 1206 ret = SVC_DENIED; 1207 goto out; 1208 complete: 1209 ret = SVC_COMPLETE; 1210 goto out; 1211 drop: 1212 ret = SVC_DROP; 1213 out: 1214 if (rsci) 1215 cache_put(&rsci->h, sn->rsc_cache); 1216 return ret; 1217 } 1218 1219 static __be32 * 1220 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1221 { 1222 __be32 *p; 1223 u32 verf_len; 1224 1225 p = gsd->verf_start; 1226 gsd->verf_start = NULL; 1227 1228 /* If the reply stat is nonzero, don't wrap: */ 1229 if (*(p-1) != rpc_success) 1230 return NULL; 1231 /* Skip the verifier: */ 1232 p += 1; 1233 verf_len = ntohl(*p++); 1234 p += XDR_QUADLEN(verf_len); 1235 /* move accept_stat to right place: */ 1236 memcpy(p, p + 2, 4); 1237 /* Also don't wrap if the accept stat is nonzero: */ 1238 if (*p != rpc_success) { 1239 resbuf->head[0].iov_len -= 2 * 4; 1240 return NULL; 1241 } 1242 p++; 1243 return p; 1244 } 1245 1246 static inline int 1247 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1248 { 1249 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1250 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1251 struct xdr_buf *resbuf = &rqstp->rq_res; 1252 struct xdr_buf integ_buf; 1253 struct xdr_netobj mic; 1254 struct kvec *resv; 1255 __be32 *p; 1256 int integ_offset, integ_len; 1257 int stat = -EINVAL; 1258 1259 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1260 if (p == NULL) 1261 goto out; 1262 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1263 integ_len = resbuf->len - integ_offset; 1264 BUG_ON(integ_len % 4); 1265 *p++ = htonl(integ_len); 1266 *p++ = htonl(gc->gc_seq); 1267 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1268 integ_len)) 1269 BUG(); 1270 if (resbuf->tail[0].iov_base == NULL) { 1271 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1272 goto out_err; 1273 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1274 + resbuf->head[0].iov_len; 1275 resbuf->tail[0].iov_len = 0; 1276 resv = &resbuf->tail[0]; 1277 } else { 1278 resv = &resbuf->tail[0]; 1279 } 1280 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1281 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1282 goto out_err; 1283 svc_putnl(resv, mic.len); 1284 memset(mic.data + mic.len, 0, 1285 round_up_to_quad(mic.len) - mic.len); 1286 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1287 /* not strictly required: */ 1288 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1289 BUG_ON(resv->iov_len > PAGE_SIZE); 1290 out: 1291 stat = 0; 1292 out_err: 1293 return stat; 1294 } 1295 1296 static inline int 1297 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1298 { 1299 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1300 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1301 struct xdr_buf *resbuf = &rqstp->rq_res; 1302 struct page **inpages = NULL; 1303 __be32 *p, *len; 1304 int offset; 1305 int pad; 1306 1307 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1308 if (p == NULL) 1309 return 0; 1310 len = p++; 1311 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1312 *p++ = htonl(gc->gc_seq); 1313 inpages = resbuf->pages; 1314 /* XXX: Would be better to write some xdr helper functions for 1315 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1316 1317 /* 1318 * If there is currently tail data, make sure there is 1319 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1320 * the page, and move the current tail data such that 1321 * there is RPC_MAX_AUTH_SIZE slack space available in 1322 * both the head and tail. 1323 */ 1324 if (resbuf->tail[0].iov_base) { 1325 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1326 + PAGE_SIZE); 1327 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1328 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1329 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1330 return -ENOMEM; 1331 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1332 resbuf->tail[0].iov_base, 1333 resbuf->tail[0].iov_len); 1334 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1335 } 1336 /* 1337 * If there is no current tail data, make sure there is 1338 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1339 * allotted page, and set up tail information such that there 1340 * is RPC_MAX_AUTH_SIZE slack space available in both the 1341 * head and tail. 1342 */ 1343 if (resbuf->tail[0].iov_base == NULL) { 1344 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1345 return -ENOMEM; 1346 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1347 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1348 resbuf->tail[0].iov_len = 0; 1349 } 1350 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1351 return -ENOMEM; 1352 *len = htonl(resbuf->len - offset); 1353 pad = 3 - ((resbuf->len - offset - 1)&3); 1354 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1355 memset(p, 0, pad); 1356 resbuf->tail[0].iov_len += pad; 1357 resbuf->len += pad; 1358 return 0; 1359 } 1360 1361 static int 1362 svcauth_gss_release(struct svc_rqst *rqstp) 1363 { 1364 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1365 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1366 struct xdr_buf *resbuf = &rqstp->rq_res; 1367 int stat = -EINVAL; 1368 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1369 1370 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1371 goto out; 1372 /* Release can be called twice, but we only wrap once. */ 1373 if (gsd->verf_start == NULL) 1374 goto out; 1375 /* normally not set till svc_send, but we need it here: */ 1376 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1377 * or whatever? */ 1378 resbuf->len = total_buf_len(resbuf); 1379 switch (gc->gc_svc) { 1380 case RPC_GSS_SVC_NONE: 1381 break; 1382 case RPC_GSS_SVC_INTEGRITY: 1383 stat = svcauth_gss_wrap_resp_integ(rqstp); 1384 if (stat) 1385 goto out_err; 1386 break; 1387 case RPC_GSS_SVC_PRIVACY: 1388 stat = svcauth_gss_wrap_resp_priv(rqstp); 1389 if (stat) 1390 goto out_err; 1391 break; 1392 /* 1393 * For any other gc_svc value, svcauth_gss_accept() already set 1394 * the auth_error appropriately; just fall through: 1395 */ 1396 } 1397 1398 out: 1399 stat = 0; 1400 out_err: 1401 if (rqstp->rq_client) 1402 auth_domain_put(rqstp->rq_client); 1403 rqstp->rq_client = NULL; 1404 if (rqstp->rq_gssclient) 1405 auth_domain_put(rqstp->rq_gssclient); 1406 rqstp->rq_gssclient = NULL; 1407 if (rqstp->rq_cred.cr_group_info) 1408 put_group_info(rqstp->rq_cred.cr_group_info); 1409 rqstp->rq_cred.cr_group_info = NULL; 1410 if (gsd->rsci) 1411 cache_put(&gsd->rsci->h, sn->rsc_cache); 1412 gsd->rsci = NULL; 1413 1414 return stat; 1415 } 1416 1417 static void 1418 svcauth_gss_domain_release(struct auth_domain *dom) 1419 { 1420 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1421 1422 kfree(dom->name); 1423 kfree(gd); 1424 } 1425 1426 static struct auth_ops svcauthops_gss = { 1427 .name = "rpcsec_gss", 1428 .owner = THIS_MODULE, 1429 .flavour = RPC_AUTH_GSS, 1430 .accept = svcauth_gss_accept, 1431 .release = svcauth_gss_release, 1432 .domain_release = svcauth_gss_domain_release, 1433 .set_client = svcauth_gss_set_client, 1434 }; 1435 1436 static int rsi_cache_create_net(struct net *net) 1437 { 1438 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1439 struct cache_detail *cd; 1440 int err; 1441 1442 cd = cache_create_net(&rsi_cache_template, net); 1443 if (IS_ERR(cd)) 1444 return PTR_ERR(cd); 1445 err = cache_register_net(cd, net); 1446 if (err) { 1447 cache_destroy_net(cd, net); 1448 return err; 1449 } 1450 sn->rsi_cache = cd; 1451 return 0; 1452 } 1453 1454 static void rsi_cache_destroy_net(struct net *net) 1455 { 1456 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1457 struct cache_detail *cd = sn->rsi_cache; 1458 1459 sn->rsi_cache = NULL; 1460 cache_purge(cd); 1461 cache_unregister_net(cd, net); 1462 cache_destroy_net(cd, net); 1463 } 1464 1465 static int rsc_cache_create_net(struct net *net) 1466 { 1467 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1468 struct cache_detail *cd; 1469 int err; 1470 1471 cd = cache_create_net(&rsc_cache_template, net); 1472 if (IS_ERR(cd)) 1473 return PTR_ERR(cd); 1474 err = cache_register_net(cd, net); 1475 if (err) { 1476 cache_destroy_net(cd, net); 1477 return err; 1478 } 1479 sn->rsc_cache = cd; 1480 return 0; 1481 } 1482 1483 static void rsc_cache_destroy_net(struct net *net) 1484 { 1485 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1486 struct cache_detail *cd = sn->rsc_cache; 1487 1488 sn->rsc_cache = NULL; 1489 cache_purge(cd); 1490 cache_unregister_net(cd, net); 1491 cache_destroy_net(cd, net); 1492 } 1493 1494 int 1495 gss_svc_init_net(struct net *net) 1496 { 1497 int rv; 1498 1499 rv = rsc_cache_create_net(net); 1500 if (rv) 1501 return rv; 1502 rv = rsi_cache_create_net(net); 1503 if (rv) 1504 goto out1; 1505 return 0; 1506 out1: 1507 rsc_cache_destroy_net(net); 1508 return rv; 1509 } 1510 1511 void 1512 gss_svc_shutdown_net(struct net *net) 1513 { 1514 rsi_cache_destroy_net(net); 1515 rsc_cache_destroy_net(net); 1516 } 1517 1518 int 1519 gss_svc_init(void) 1520 { 1521 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1522 } 1523 1524 void 1525 gss_svc_shutdown(void) 1526 { 1527 svc_auth_unregister(RPC_AUTH_GSS); 1528 } 1529