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