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, cd->cache_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_request = rsi_request, 280 .cache_parse = rsi_parse, 281 .match = rsi_match, 282 .init = rsi_init, 283 .update = update_rsi, 284 .alloc = rsi_alloc, 285 }; 286 287 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item) 288 { 289 struct cache_head *ch; 290 int hash = rsi_hash(item); 291 292 ch = sunrpc_cache_lookup(cd, &item->h, hash); 293 if (ch) 294 return container_of(ch, struct rsi, h); 295 else 296 return NULL; 297 } 298 299 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old) 300 { 301 struct cache_head *ch; 302 int hash = rsi_hash(new); 303 304 ch = sunrpc_cache_update(cd, &new->h, 305 &old->h, hash); 306 if (ch) 307 return container_of(ch, struct rsi, h); 308 else 309 return NULL; 310 } 311 312 313 /* 314 * The rpcsec_context cache is used to store a context that is 315 * used in data exchange. 316 * The key is a context handle. The content is: 317 * uid, gidlist, mechanism, service-set, mech-specific-data 318 */ 319 320 #define RSC_HASHBITS 10 321 #define RSC_HASHMAX (1<<RSC_HASHBITS) 322 323 #define GSS_SEQ_WIN 128 324 325 struct gss_svc_seq_data { 326 /* highest seq number seen so far: */ 327 int sd_max; 328 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 329 * sd_win is nonzero iff sequence number i has been seen already: */ 330 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 331 spinlock_t sd_lock; 332 }; 333 334 struct rsc { 335 struct cache_head h; 336 struct xdr_netobj handle; 337 struct svc_cred cred; 338 struct gss_svc_seq_data seqdata; 339 struct gss_ctx *mechctx; 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 free_svc_cred(&rsci->cred); 351 } 352 353 static void rsc_put(struct kref *ref) 354 { 355 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 356 357 rsc_free(rsci); 358 kfree(rsci); 359 } 360 361 static inline int 362 rsc_hash(struct rsc *rsci) 363 { 364 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 365 } 366 367 static int 368 rsc_match(struct cache_head *a, struct cache_head *b) 369 { 370 struct rsc *new = container_of(a, struct rsc, h); 371 struct rsc *tmp = container_of(b, struct rsc, h); 372 373 return netobj_equal(&new->handle, &tmp->handle); 374 } 375 376 static void 377 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 378 { 379 struct rsc *new = container_of(cnew, struct rsc, h); 380 struct rsc *tmp = container_of(ctmp, struct rsc, h); 381 382 new->handle.len = tmp->handle.len; 383 tmp->handle.len = 0; 384 new->handle.data = tmp->handle.data; 385 tmp->handle.data = NULL; 386 new->mechctx = NULL; 387 new->cred.cr_group_info = NULL; 388 new->cred.cr_principal = NULL; 389 } 390 391 static void 392 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 393 { 394 struct rsc *new = container_of(cnew, struct rsc, h); 395 struct rsc *tmp = container_of(ctmp, struct rsc, h); 396 397 new->mechctx = tmp->mechctx; 398 tmp->mechctx = NULL; 399 memset(&new->seqdata, 0, sizeof(new->seqdata)); 400 spin_lock_init(&new->seqdata.sd_lock); 401 new->cred = tmp->cred; 402 tmp->cred.cr_group_info = NULL; 403 new->cred.cr_principal = tmp->cred.cr_principal; 404 tmp->cred.cr_principal = NULL; 405 } 406 407 static struct cache_head * 408 rsc_alloc(void) 409 { 410 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 411 if (rsci) 412 return &rsci->h; 413 else 414 return NULL; 415 } 416 417 static int rsc_parse(struct cache_detail *cd, 418 char *mesg, int mlen) 419 { 420 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 421 char *buf = mesg; 422 int len, rv; 423 struct rsc rsci, *rscp = NULL; 424 time_t expiry; 425 int status = -EINVAL; 426 struct gss_api_mech *gm = NULL; 427 428 memset(&rsci, 0, sizeof(rsci)); 429 /* context handle */ 430 len = qword_get(&mesg, buf, mlen); 431 if (len < 0) goto out; 432 status = -ENOMEM; 433 if (dup_to_netobj(&rsci.handle, buf, len)) 434 goto out; 435 436 rsci.h.flags = 0; 437 /* expiry */ 438 expiry = get_expiry(&mesg); 439 status = -EINVAL; 440 if (expiry == 0) 441 goto out; 442 443 rscp = rsc_lookup(cd, &rsci); 444 if (!rscp) 445 goto out; 446 447 /* uid, or NEGATIVE */ 448 rv = get_int(&mesg, &rsci.cred.cr_uid); 449 if (rv == -EINVAL) 450 goto out; 451 if (rv == -ENOENT) 452 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 453 else { 454 int N, i; 455 456 /* gid */ 457 if (get_int(&mesg, &rsci.cred.cr_gid)) 458 goto out; 459 460 /* number of additional gid's */ 461 if (get_int(&mesg, &N)) 462 goto out; 463 status = -ENOMEM; 464 rsci.cred.cr_group_info = groups_alloc(N); 465 if (rsci.cred.cr_group_info == NULL) 466 goto out; 467 468 /* gid's */ 469 status = -EINVAL; 470 for (i=0; i<N; i++) { 471 gid_t gid; 472 kgid_t kgid; 473 if (get_int(&mesg, &gid)) 474 goto out; 475 kgid = make_kgid(&init_user_ns, gid); 476 if (!gid_valid(kgid)) 477 goto out; 478 GROUP_AT(rsci.cred.cr_group_info, i) = kgid; 479 } 480 481 /* mech name */ 482 len = qword_get(&mesg, buf, mlen); 483 if (len < 0) 484 goto out; 485 gm = gss_mech_get_by_name(buf); 486 status = -EOPNOTSUPP; 487 if (!gm) 488 goto out; 489 490 status = -EINVAL; 491 /* mech-specific data: */ 492 len = qword_get(&mesg, buf, mlen); 493 if (len < 0) 494 goto out; 495 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, GFP_KERNEL); 496 if (status) 497 goto out; 498 499 /* get client name */ 500 len = qword_get(&mesg, buf, mlen); 501 if (len > 0) { 502 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL); 503 if (!rsci.cred.cr_principal) 504 goto out; 505 } 506 507 } 508 rsci.h.expiry_time = expiry; 509 rscp = rsc_update(cd, &rsci, rscp); 510 status = 0; 511 out: 512 gss_mech_put(gm); 513 rsc_free(&rsci); 514 if (rscp) 515 cache_put(&rscp->h, cd); 516 else 517 status = -ENOMEM; 518 return status; 519 } 520 521 static struct cache_detail rsc_cache_template = { 522 .owner = THIS_MODULE, 523 .hash_size = RSC_HASHMAX, 524 .name = "auth.rpcsec.context", 525 .cache_put = rsc_put, 526 .cache_parse = rsc_parse, 527 .match = rsc_match, 528 .init = rsc_init, 529 .update = update_rsc, 530 .alloc = rsc_alloc, 531 }; 532 533 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) 534 { 535 struct cache_head *ch; 536 int hash = rsc_hash(item); 537 538 ch = sunrpc_cache_lookup(cd, &item->h, hash); 539 if (ch) 540 return container_of(ch, struct rsc, h); 541 else 542 return NULL; 543 } 544 545 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) 546 { 547 struct cache_head *ch; 548 int hash = rsc_hash(new); 549 550 ch = sunrpc_cache_update(cd, &new->h, 551 &old->h, hash); 552 if (ch) 553 return container_of(ch, struct rsc, h); 554 else 555 return NULL; 556 } 557 558 559 static struct rsc * 560 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) 561 { 562 struct rsc rsci; 563 struct rsc *found; 564 565 memset(&rsci, 0, sizeof(rsci)); 566 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 567 return NULL; 568 found = rsc_lookup(cd, &rsci); 569 rsc_free(&rsci); 570 if (!found) 571 return NULL; 572 if (cache_check(cd, &found->h, NULL)) 573 return NULL; 574 return found; 575 } 576 577 /* Implements sequence number algorithm as specified in RFC 2203. */ 578 static int 579 gss_check_seq_num(struct rsc *rsci, int seq_num) 580 { 581 struct gss_svc_seq_data *sd = &rsci->seqdata; 582 583 spin_lock(&sd->sd_lock); 584 if (seq_num > sd->sd_max) { 585 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 586 memset(sd->sd_win,0,sizeof(sd->sd_win)); 587 sd->sd_max = seq_num; 588 } else while (sd->sd_max < seq_num) { 589 sd->sd_max++; 590 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 591 } 592 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 593 goto ok; 594 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 595 goto drop; 596 } 597 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 598 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 599 goto drop; 600 ok: 601 spin_unlock(&sd->sd_lock); 602 return 1; 603 drop: 604 spin_unlock(&sd->sd_lock); 605 return 0; 606 } 607 608 static inline u32 round_up_to_quad(u32 i) 609 { 610 return (i + 3 ) & ~3; 611 } 612 613 static inline int 614 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 615 { 616 int l; 617 618 if (argv->iov_len < 4) 619 return -1; 620 o->len = svc_getnl(argv); 621 l = round_up_to_quad(o->len); 622 if (argv->iov_len < l) 623 return -1; 624 o->data = argv->iov_base; 625 argv->iov_base += l; 626 argv->iov_len -= l; 627 return 0; 628 } 629 630 static inline int 631 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 632 { 633 u8 *p; 634 635 if (resv->iov_len + 4 > PAGE_SIZE) 636 return -1; 637 svc_putnl(resv, o->len); 638 p = resv->iov_base + resv->iov_len; 639 resv->iov_len += round_up_to_quad(o->len); 640 if (resv->iov_len > PAGE_SIZE) 641 return -1; 642 memcpy(p, o->data, o->len); 643 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 644 return 0; 645 } 646 647 /* 648 * Verify the checksum on the header and return SVC_OK on success. 649 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 650 * or return SVC_DENIED and indicate error in authp. 651 */ 652 static int 653 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 654 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 655 { 656 struct gss_ctx *ctx_id = rsci->mechctx; 657 struct xdr_buf rpchdr; 658 struct xdr_netobj checksum; 659 u32 flavor = 0; 660 struct kvec *argv = &rqstp->rq_arg.head[0]; 661 struct kvec iov; 662 663 /* data to compute the checksum over: */ 664 iov.iov_base = rpcstart; 665 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 666 xdr_buf_from_iov(&iov, &rpchdr); 667 668 *authp = rpc_autherr_badverf; 669 if (argv->iov_len < 4) 670 return SVC_DENIED; 671 flavor = svc_getnl(argv); 672 if (flavor != RPC_AUTH_GSS) 673 return SVC_DENIED; 674 if (svc_safe_getnetobj(argv, &checksum)) 675 return SVC_DENIED; 676 677 if (rqstp->rq_deferred) /* skip verification of revisited request */ 678 return SVC_OK; 679 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 680 *authp = rpcsec_gsserr_credproblem; 681 return SVC_DENIED; 682 } 683 684 if (gc->gc_seq > MAXSEQ) { 685 dprintk("RPC: svcauth_gss: discarding request with " 686 "large sequence number %d\n", gc->gc_seq); 687 *authp = rpcsec_gsserr_ctxproblem; 688 return SVC_DENIED; 689 } 690 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 691 dprintk("RPC: svcauth_gss: discarding request with " 692 "old sequence number %d\n", gc->gc_seq); 693 return SVC_DROP; 694 } 695 return SVC_OK; 696 } 697 698 static int 699 gss_write_null_verf(struct svc_rqst *rqstp) 700 { 701 __be32 *p; 702 703 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 704 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 705 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 706 *p++ = 0; 707 if (!xdr_ressize_check(rqstp, p)) 708 return -1; 709 return 0; 710 } 711 712 static int 713 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 714 { 715 __be32 xdr_seq; 716 u32 maj_stat; 717 struct xdr_buf verf_data; 718 struct xdr_netobj mic; 719 __be32 *p; 720 struct kvec iov; 721 722 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 723 xdr_seq = htonl(seq); 724 725 iov.iov_base = &xdr_seq; 726 iov.iov_len = sizeof(xdr_seq); 727 xdr_buf_from_iov(&iov, &verf_data); 728 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 729 mic.data = (u8 *)(p + 1); 730 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 731 if (maj_stat != GSS_S_COMPLETE) 732 return -1; 733 *p++ = htonl(mic.len); 734 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 735 p += XDR_QUADLEN(mic.len); 736 if (!xdr_ressize_check(rqstp, p)) 737 return -1; 738 return 0; 739 } 740 741 struct gss_domain { 742 struct auth_domain h; 743 u32 pseudoflavor; 744 }; 745 746 static struct auth_domain * 747 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 748 { 749 char *name; 750 751 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 752 if (!name) 753 return NULL; 754 return auth_domain_find(name); 755 } 756 757 static struct auth_ops svcauthops_gss; 758 759 u32 svcauth_gss_flavor(struct auth_domain *dom) 760 { 761 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 762 763 return gd->pseudoflavor; 764 } 765 766 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 767 768 int 769 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 770 { 771 struct gss_domain *new; 772 struct auth_domain *test; 773 int stat = -ENOMEM; 774 775 new = kmalloc(sizeof(*new), GFP_KERNEL); 776 if (!new) 777 goto out; 778 kref_init(&new->h.ref); 779 new->h.name = kstrdup(name, GFP_KERNEL); 780 if (!new->h.name) 781 goto out_free_dom; 782 new->h.flavour = &svcauthops_gss; 783 new->pseudoflavor = pseudoflavor; 784 785 stat = 0; 786 test = auth_domain_lookup(name, &new->h); 787 if (test != &new->h) { /* Duplicate registration */ 788 auth_domain_put(test); 789 kfree(new->h.name); 790 goto out_free_dom; 791 } 792 return 0; 793 794 out_free_dom: 795 kfree(new); 796 out: 797 return stat; 798 } 799 800 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 801 802 static inline int 803 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 804 { 805 __be32 raw; 806 int status; 807 808 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 809 if (status) 810 return status; 811 *obj = ntohl(raw); 812 return 0; 813 } 814 815 /* It would be nice if this bit of code could be shared with the client. 816 * Obstacles: 817 * The client shouldn't malloc(), would have to pass in own memory. 818 * The server uses base of head iovec as read pointer, while the 819 * client uses separate pointer. */ 820 static int 821 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 822 { 823 int stat = -EINVAL; 824 u32 integ_len, maj_stat; 825 struct xdr_netobj mic; 826 struct xdr_buf integ_buf; 827 828 /* Did we already verify the signature on the original pass through? */ 829 if (rqstp->rq_deferred) 830 return 0; 831 832 integ_len = svc_getnl(&buf->head[0]); 833 if (integ_len & 3) 834 return stat; 835 if (integ_len > buf->len) 836 return stat; 837 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 838 BUG(); 839 /* copy out mic... */ 840 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 841 BUG(); 842 if (mic.len > RPC_MAX_AUTH_SIZE) 843 return stat; 844 mic.data = kmalloc(mic.len, GFP_KERNEL); 845 if (!mic.data) 846 return stat; 847 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 848 goto out; 849 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 850 if (maj_stat != GSS_S_COMPLETE) 851 goto out; 852 if (svc_getnl(&buf->head[0]) != seq) 853 goto out; 854 /* trim off the mic at the end before returning */ 855 xdr_buf_trim(buf, mic.len + 4); 856 stat = 0; 857 out: 858 kfree(mic.data); 859 return stat; 860 } 861 862 static inline int 863 total_buf_len(struct xdr_buf *buf) 864 { 865 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 866 } 867 868 static void 869 fix_priv_head(struct xdr_buf *buf, int pad) 870 { 871 if (buf->page_len == 0) { 872 /* We need to adjust head and buf->len in tandem in this 873 * case to make svc_defer() work--it finds the original 874 * buffer start using buf->len - buf->head[0].iov_len. */ 875 buf->head[0].iov_len -= pad; 876 } 877 } 878 879 static int 880 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 881 { 882 u32 priv_len, maj_stat; 883 int pad, saved_len, remaining_len, offset; 884 885 rqstp->rq_splice_ok = 0; 886 887 priv_len = svc_getnl(&buf->head[0]); 888 if (rqstp->rq_deferred) { 889 /* Already decrypted last time through! The sequence number 890 * check at out_seq is unnecessary but harmless: */ 891 goto out_seq; 892 } 893 /* buf->len is the number of bytes from the original start of the 894 * request to the end, where head[0].iov_len is just the bytes 895 * not yet read from the head, so these two values are different: */ 896 remaining_len = total_buf_len(buf); 897 if (priv_len > remaining_len) 898 return -EINVAL; 899 pad = remaining_len - priv_len; 900 buf->len -= pad; 901 fix_priv_head(buf, pad); 902 903 /* Maybe it would be better to give gss_unwrap a length parameter: */ 904 saved_len = buf->len; 905 buf->len = priv_len; 906 maj_stat = gss_unwrap(ctx, 0, buf); 907 pad = priv_len - buf->len; 908 buf->len = saved_len; 909 buf->len -= pad; 910 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 911 * In the krb5p case, at least, the data ends up offset, so we need to 912 * move it around. */ 913 /* XXX: This is very inefficient. It would be better to either do 914 * this while we encrypt, or maybe in the receive code, if we can peak 915 * ahead and work out the service and mechanism there. */ 916 offset = buf->head[0].iov_len % 4; 917 if (offset) { 918 buf->buflen = RPCSVC_MAXPAYLOAD; 919 xdr_shift_buf(buf, offset); 920 fix_priv_head(buf, pad); 921 } 922 if (maj_stat != GSS_S_COMPLETE) 923 return -EINVAL; 924 out_seq: 925 if (svc_getnl(&buf->head[0]) != seq) 926 return -EINVAL; 927 return 0; 928 } 929 930 struct gss_svc_data { 931 /* decoded gss client cred: */ 932 struct rpc_gss_wire_cred clcred; 933 /* save a pointer to the beginning of the encoded verifier, 934 * for use in encryption/checksumming in svcauth_gss_release: */ 935 __be32 *verf_start; 936 struct rsc *rsci; 937 }; 938 939 static int 940 svcauth_gss_set_client(struct svc_rqst *rqstp) 941 { 942 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 943 struct rsc *rsci = svcdata->rsci; 944 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 945 int stat; 946 947 /* 948 * A gss export can be specified either by: 949 * export *(sec=krb5,rw) 950 * or by 951 * export gss/krb5(rw) 952 * The latter is deprecated; but for backwards compatibility reasons 953 * the nfsd code will still fall back on trying it if the former 954 * doesn't work; so we try to make both available to nfsd, below. 955 */ 956 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 957 if (rqstp->rq_gssclient == NULL) 958 return SVC_DENIED; 959 stat = svcauth_unix_set_client(rqstp); 960 if (stat == SVC_DROP || stat == SVC_CLOSE) 961 return stat; 962 return SVC_OK; 963 } 964 965 static inline int 966 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, 967 struct xdr_netobj *out_handle, int *major_status) 968 { 969 struct rsc *rsci; 970 int rc; 971 972 if (*major_status != GSS_S_COMPLETE) 973 return gss_write_null_verf(rqstp); 974 rsci = gss_svc_searchbyctx(cd, out_handle); 975 if (rsci == NULL) { 976 *major_status = GSS_S_NO_CONTEXT; 977 return gss_write_null_verf(rqstp); 978 } 979 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 980 cache_put(&rsci->h, cd); 981 return rc; 982 } 983 984 static inline int 985 gss_read_verf(struct rpc_gss_wire_cred *gc, 986 struct kvec *argv, __be32 *authp, 987 struct xdr_netobj *in_handle, 988 struct xdr_netobj *in_token) 989 { 990 struct xdr_netobj tmpobj; 991 992 /* Read the verifier; should be NULL: */ 993 *authp = rpc_autherr_badverf; 994 if (argv->iov_len < 2 * 4) 995 return SVC_DENIED; 996 if (svc_getnl(argv) != RPC_AUTH_NULL) 997 return SVC_DENIED; 998 if (svc_getnl(argv) != 0) 999 return SVC_DENIED; 1000 /* Martial context handle and token for upcall: */ 1001 *authp = rpc_autherr_badcred; 1002 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 1003 return SVC_DENIED; 1004 if (dup_netobj(in_handle, &gc->gc_ctx)) 1005 return SVC_CLOSE; 1006 *authp = rpc_autherr_badverf; 1007 if (svc_safe_getnetobj(argv, &tmpobj)) { 1008 kfree(in_handle->data); 1009 return SVC_DENIED; 1010 } 1011 if (dup_netobj(in_token, &tmpobj)) { 1012 kfree(in_handle->data); 1013 return SVC_CLOSE; 1014 } 1015 1016 return 0; 1017 } 1018 1019 static inline int 1020 gss_write_resv(struct kvec *resv, size_t size_limit, 1021 struct xdr_netobj *out_handle, struct xdr_netobj *out_token, 1022 int major_status, int minor_status) 1023 { 1024 if (resv->iov_len + 4 > size_limit) 1025 return -1; 1026 svc_putnl(resv, RPC_SUCCESS); 1027 if (svc_safe_putnetobj(resv, out_handle)) 1028 return -1; 1029 if (resv->iov_len + 3 * 4 > size_limit) 1030 return -1; 1031 svc_putnl(resv, major_status); 1032 svc_putnl(resv, minor_status); 1033 svc_putnl(resv, GSS_SEQ_WIN); 1034 if (svc_safe_putnetobj(resv, out_token)) 1035 return -1; 1036 return 0; 1037 } 1038 1039 /* 1040 * Having read the cred already and found we're in the context 1041 * initiation case, read the verifier and initiate (or check the results 1042 * of) upcalls to userspace for help with context initiation. If 1043 * the upcall results are available, write the verifier and result. 1044 * Otherwise, drop the request pending an answer to the upcall. 1045 */ 1046 static int svcauth_gss_handle_init(struct svc_rqst *rqstp, 1047 struct rpc_gss_wire_cred *gc, __be32 *authp) 1048 { 1049 struct kvec *argv = &rqstp->rq_arg.head[0]; 1050 struct kvec *resv = &rqstp->rq_res.head[0]; 1051 struct rsi *rsip, rsikey; 1052 int ret; 1053 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1054 1055 memset(&rsikey, 0, sizeof(rsikey)); 1056 ret = gss_read_verf(gc, argv, authp, 1057 &rsikey.in_handle, &rsikey.in_token); 1058 if (ret) 1059 return ret; 1060 1061 /* Perform upcall, or find upcall result: */ 1062 rsip = rsi_lookup(sn->rsi_cache, &rsikey); 1063 rsi_free(&rsikey); 1064 if (!rsip) 1065 return SVC_CLOSE; 1066 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 1067 /* No upcall result: */ 1068 return SVC_CLOSE; 1069 1070 ret = SVC_CLOSE; 1071 /* Got an answer to the upcall; use it: */ 1072 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1073 &rsip->out_handle, &rsip->major_status)) 1074 goto out; 1075 if (gss_write_resv(resv, PAGE_SIZE, 1076 &rsip->out_handle, &rsip->out_token, 1077 rsip->major_status, rsip->minor_status)) 1078 goto out; 1079 1080 ret = SVC_COMPLETE; 1081 out: 1082 cache_put(&rsip->h, sn->rsi_cache); 1083 return ret; 1084 } 1085 1086 /* 1087 * Accept an rpcsec packet. 1088 * If context establishment, punt to user space 1089 * If data exchange, verify/decrypt 1090 * If context destruction, handle here 1091 * In the context establishment and destruction case we encode 1092 * response here and return SVC_COMPLETE. 1093 */ 1094 static int 1095 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 1096 { 1097 struct kvec *argv = &rqstp->rq_arg.head[0]; 1098 struct kvec *resv = &rqstp->rq_res.head[0]; 1099 u32 crlen; 1100 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1101 struct rpc_gss_wire_cred *gc; 1102 struct rsc *rsci = NULL; 1103 __be32 *rpcstart; 1104 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1105 int ret; 1106 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1107 1108 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 1109 argv->iov_len); 1110 1111 *authp = rpc_autherr_badcred; 1112 if (!svcdata) 1113 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1114 if (!svcdata) 1115 goto auth_err; 1116 rqstp->rq_auth_data = svcdata; 1117 svcdata->verf_start = NULL; 1118 svcdata->rsci = NULL; 1119 gc = &svcdata->clcred; 1120 1121 /* start of rpc packet is 7 u32's back from here: 1122 * xid direction rpcversion prog vers proc flavour 1123 */ 1124 rpcstart = argv->iov_base; 1125 rpcstart -= 7; 1126 1127 /* credential is: 1128 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1129 * at least 5 u32s, and is preceded by length, so that makes 6. 1130 */ 1131 1132 if (argv->iov_len < 5 * 4) 1133 goto auth_err; 1134 crlen = svc_getnl(argv); 1135 if (svc_getnl(argv) != RPC_GSS_VERSION) 1136 goto auth_err; 1137 gc->gc_proc = svc_getnl(argv); 1138 gc->gc_seq = svc_getnl(argv); 1139 gc->gc_svc = svc_getnl(argv); 1140 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1141 goto auth_err; 1142 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1143 goto auth_err; 1144 1145 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1146 goto auth_err; 1147 1148 *authp = rpc_autherr_badverf; 1149 switch (gc->gc_proc) { 1150 case RPC_GSS_PROC_INIT: 1151 case RPC_GSS_PROC_CONTINUE_INIT: 1152 return svcauth_gss_handle_init(rqstp, gc, authp); 1153 case RPC_GSS_PROC_DATA: 1154 case RPC_GSS_PROC_DESTROY: 1155 /* Look up the context, and check the verifier: */ 1156 *authp = rpcsec_gsserr_credproblem; 1157 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 1158 if (!rsci) 1159 goto auth_err; 1160 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1161 case SVC_OK: 1162 break; 1163 case SVC_DENIED: 1164 goto auth_err; 1165 case SVC_DROP: 1166 goto drop; 1167 } 1168 break; 1169 default: 1170 *authp = rpc_autherr_rejectedcred; 1171 goto auth_err; 1172 } 1173 1174 /* now act upon the command: */ 1175 switch (gc->gc_proc) { 1176 case RPC_GSS_PROC_DESTROY: 1177 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1178 goto auth_err; 1179 rsci->h.expiry_time = get_seconds(); 1180 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1181 if (resv->iov_len + 4 > PAGE_SIZE) 1182 goto drop; 1183 svc_putnl(resv, RPC_SUCCESS); 1184 goto complete; 1185 case RPC_GSS_PROC_DATA: 1186 *authp = rpcsec_gsserr_ctxproblem; 1187 svcdata->verf_start = resv->iov_base + resv->iov_len; 1188 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1189 goto auth_err; 1190 rqstp->rq_cred = rsci->cred; 1191 get_group_info(rsci->cred.cr_group_info); 1192 *authp = rpc_autherr_badcred; 1193 switch (gc->gc_svc) { 1194 case RPC_GSS_SVC_NONE: 1195 break; 1196 case RPC_GSS_SVC_INTEGRITY: 1197 /* placeholders for length and seq. number: */ 1198 svc_putnl(resv, 0); 1199 svc_putnl(resv, 0); 1200 if (unwrap_integ_data(rqstp, &rqstp->rq_arg, 1201 gc->gc_seq, rsci->mechctx)) 1202 goto garbage_args; 1203 break; 1204 case RPC_GSS_SVC_PRIVACY: 1205 /* placeholders for length and seq. number: */ 1206 svc_putnl(resv, 0); 1207 svc_putnl(resv, 0); 1208 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1209 gc->gc_seq, rsci->mechctx)) 1210 goto garbage_args; 1211 break; 1212 default: 1213 goto auth_err; 1214 } 1215 svcdata->rsci = rsci; 1216 cache_get(&rsci->h); 1217 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( 1218 rsci->mechctx->mech_type, gc->gc_svc); 1219 ret = SVC_OK; 1220 goto out; 1221 } 1222 garbage_args: 1223 ret = SVC_GARBAGE; 1224 goto out; 1225 auth_err: 1226 /* Restore write pointer to its original value: */ 1227 xdr_ressize_check(rqstp, reject_stat); 1228 ret = SVC_DENIED; 1229 goto out; 1230 complete: 1231 ret = SVC_COMPLETE; 1232 goto out; 1233 drop: 1234 ret = SVC_DROP; 1235 out: 1236 if (rsci) 1237 cache_put(&rsci->h, sn->rsc_cache); 1238 return ret; 1239 } 1240 1241 static __be32 * 1242 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1243 { 1244 __be32 *p; 1245 u32 verf_len; 1246 1247 p = gsd->verf_start; 1248 gsd->verf_start = NULL; 1249 1250 /* If the reply stat is nonzero, don't wrap: */ 1251 if (*(p-1) != rpc_success) 1252 return NULL; 1253 /* Skip the verifier: */ 1254 p += 1; 1255 verf_len = ntohl(*p++); 1256 p += XDR_QUADLEN(verf_len); 1257 /* move accept_stat to right place: */ 1258 memcpy(p, p + 2, 4); 1259 /* Also don't wrap if the accept stat is nonzero: */ 1260 if (*p != rpc_success) { 1261 resbuf->head[0].iov_len -= 2 * 4; 1262 return NULL; 1263 } 1264 p++; 1265 return p; 1266 } 1267 1268 static inline int 1269 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1270 { 1271 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1272 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1273 struct xdr_buf *resbuf = &rqstp->rq_res; 1274 struct xdr_buf integ_buf; 1275 struct xdr_netobj mic; 1276 struct kvec *resv; 1277 __be32 *p; 1278 int integ_offset, integ_len; 1279 int stat = -EINVAL; 1280 1281 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1282 if (p == NULL) 1283 goto out; 1284 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1285 integ_len = resbuf->len - integ_offset; 1286 BUG_ON(integ_len % 4); 1287 *p++ = htonl(integ_len); 1288 *p++ = htonl(gc->gc_seq); 1289 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1290 integ_len)) 1291 BUG(); 1292 if (resbuf->tail[0].iov_base == NULL) { 1293 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1294 goto out_err; 1295 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1296 + resbuf->head[0].iov_len; 1297 resbuf->tail[0].iov_len = 0; 1298 resv = &resbuf->tail[0]; 1299 } else { 1300 resv = &resbuf->tail[0]; 1301 } 1302 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1303 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1304 goto out_err; 1305 svc_putnl(resv, mic.len); 1306 memset(mic.data + mic.len, 0, 1307 round_up_to_quad(mic.len) - mic.len); 1308 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1309 /* not strictly required: */ 1310 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1311 BUG_ON(resv->iov_len > PAGE_SIZE); 1312 out: 1313 stat = 0; 1314 out_err: 1315 return stat; 1316 } 1317 1318 static inline int 1319 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1320 { 1321 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1322 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1323 struct xdr_buf *resbuf = &rqstp->rq_res; 1324 struct page **inpages = NULL; 1325 __be32 *p, *len; 1326 int offset; 1327 int pad; 1328 1329 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1330 if (p == NULL) 1331 return 0; 1332 len = p++; 1333 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1334 *p++ = htonl(gc->gc_seq); 1335 inpages = resbuf->pages; 1336 /* XXX: Would be better to write some xdr helper functions for 1337 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1338 1339 /* 1340 * If there is currently tail data, make sure there is 1341 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1342 * the page, and move the current tail data such that 1343 * there is RPC_MAX_AUTH_SIZE slack space available in 1344 * both the head and tail. 1345 */ 1346 if (resbuf->tail[0].iov_base) { 1347 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1348 + PAGE_SIZE); 1349 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1350 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1351 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1352 return -ENOMEM; 1353 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1354 resbuf->tail[0].iov_base, 1355 resbuf->tail[0].iov_len); 1356 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1357 } 1358 /* 1359 * If there is no current tail data, make sure there is 1360 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1361 * allotted page, and set up tail information such that there 1362 * is RPC_MAX_AUTH_SIZE slack space available in both the 1363 * head and tail. 1364 */ 1365 if (resbuf->tail[0].iov_base == NULL) { 1366 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1367 return -ENOMEM; 1368 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1369 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1370 resbuf->tail[0].iov_len = 0; 1371 } 1372 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1373 return -ENOMEM; 1374 *len = htonl(resbuf->len - offset); 1375 pad = 3 - ((resbuf->len - offset - 1)&3); 1376 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1377 memset(p, 0, pad); 1378 resbuf->tail[0].iov_len += pad; 1379 resbuf->len += pad; 1380 return 0; 1381 } 1382 1383 static int 1384 svcauth_gss_release(struct svc_rqst *rqstp) 1385 { 1386 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1387 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1388 struct xdr_buf *resbuf = &rqstp->rq_res; 1389 int stat = -EINVAL; 1390 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1391 1392 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1393 goto out; 1394 /* Release can be called twice, but we only wrap once. */ 1395 if (gsd->verf_start == NULL) 1396 goto out; 1397 /* normally not set till svc_send, but we need it here: */ 1398 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1399 * or whatever? */ 1400 resbuf->len = total_buf_len(resbuf); 1401 switch (gc->gc_svc) { 1402 case RPC_GSS_SVC_NONE: 1403 break; 1404 case RPC_GSS_SVC_INTEGRITY: 1405 stat = svcauth_gss_wrap_resp_integ(rqstp); 1406 if (stat) 1407 goto out_err; 1408 break; 1409 case RPC_GSS_SVC_PRIVACY: 1410 stat = svcauth_gss_wrap_resp_priv(rqstp); 1411 if (stat) 1412 goto out_err; 1413 break; 1414 /* 1415 * For any other gc_svc value, svcauth_gss_accept() already set 1416 * the auth_error appropriately; just fall through: 1417 */ 1418 } 1419 1420 out: 1421 stat = 0; 1422 out_err: 1423 if (rqstp->rq_client) 1424 auth_domain_put(rqstp->rq_client); 1425 rqstp->rq_client = NULL; 1426 if (rqstp->rq_gssclient) 1427 auth_domain_put(rqstp->rq_gssclient); 1428 rqstp->rq_gssclient = NULL; 1429 if (rqstp->rq_cred.cr_group_info) 1430 put_group_info(rqstp->rq_cred.cr_group_info); 1431 rqstp->rq_cred.cr_group_info = NULL; 1432 if (gsd->rsci) 1433 cache_put(&gsd->rsci->h, sn->rsc_cache); 1434 gsd->rsci = NULL; 1435 1436 return stat; 1437 } 1438 1439 static void 1440 svcauth_gss_domain_release(struct auth_domain *dom) 1441 { 1442 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1443 1444 kfree(dom->name); 1445 kfree(gd); 1446 } 1447 1448 static struct auth_ops svcauthops_gss = { 1449 .name = "rpcsec_gss", 1450 .owner = THIS_MODULE, 1451 .flavour = RPC_AUTH_GSS, 1452 .accept = svcauth_gss_accept, 1453 .release = svcauth_gss_release, 1454 .domain_release = svcauth_gss_domain_release, 1455 .set_client = svcauth_gss_set_client, 1456 }; 1457 1458 static int rsi_cache_create_net(struct net *net) 1459 { 1460 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1461 struct cache_detail *cd; 1462 int err; 1463 1464 cd = cache_create_net(&rsi_cache_template, net); 1465 if (IS_ERR(cd)) 1466 return PTR_ERR(cd); 1467 err = cache_register_net(cd, net); 1468 if (err) { 1469 cache_destroy_net(cd, net); 1470 return err; 1471 } 1472 sn->rsi_cache = cd; 1473 return 0; 1474 } 1475 1476 static void rsi_cache_destroy_net(struct net *net) 1477 { 1478 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1479 struct cache_detail *cd = sn->rsi_cache; 1480 1481 sn->rsi_cache = NULL; 1482 cache_purge(cd); 1483 cache_unregister_net(cd, net); 1484 cache_destroy_net(cd, net); 1485 } 1486 1487 static int rsc_cache_create_net(struct net *net) 1488 { 1489 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1490 struct cache_detail *cd; 1491 int err; 1492 1493 cd = cache_create_net(&rsc_cache_template, net); 1494 if (IS_ERR(cd)) 1495 return PTR_ERR(cd); 1496 err = cache_register_net(cd, net); 1497 if (err) { 1498 cache_destroy_net(cd, net); 1499 return err; 1500 } 1501 sn->rsc_cache = cd; 1502 return 0; 1503 } 1504 1505 static void rsc_cache_destroy_net(struct net *net) 1506 { 1507 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1508 struct cache_detail *cd = sn->rsc_cache; 1509 1510 sn->rsc_cache = NULL; 1511 cache_purge(cd); 1512 cache_unregister_net(cd, net); 1513 cache_destroy_net(cd, net); 1514 } 1515 1516 int 1517 gss_svc_init_net(struct net *net) 1518 { 1519 int rv; 1520 1521 rv = rsc_cache_create_net(net); 1522 if (rv) 1523 return rv; 1524 rv = rsi_cache_create_net(net); 1525 if (rv) 1526 goto out1; 1527 return 0; 1528 out1: 1529 rsc_cache_destroy_net(net); 1530 return rv; 1531 } 1532 1533 void 1534 gss_svc_shutdown_net(struct net *net) 1535 { 1536 rsi_cache_destroy_net(net); 1537 rsc_cache_destroy_net(net); 1538 } 1539 1540 int 1541 gss_svc_init(void) 1542 { 1543 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1544 } 1545 1546 void 1547 gss_svc_shutdown(void) 1548 { 1549 svc_auth_unregister(RPC_AUTH_GSS); 1550 } 1551