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_parse(struct cache_detail *cd, 186 char *mesg, int mlen) 187 { 188 /* context token expiry major minor context token */ 189 char *buf = mesg; 190 char *ep; 191 int len; 192 struct rsi rsii, *rsip = NULL; 193 time_t expiry; 194 int status = -EINVAL; 195 196 memset(&rsii, 0, sizeof(rsii)); 197 /* handle */ 198 len = qword_get(&mesg, buf, mlen); 199 if (len < 0) 200 goto out; 201 status = -ENOMEM; 202 if (dup_to_netobj(&rsii.in_handle, buf, len)) 203 goto out; 204 205 /* token */ 206 len = qword_get(&mesg, buf, mlen); 207 status = -EINVAL; 208 if (len < 0) 209 goto out; 210 status = -ENOMEM; 211 if (dup_to_netobj(&rsii.in_token, buf, len)) 212 goto out; 213 214 rsip = rsi_lookup(cd, &rsii); 215 if (!rsip) 216 goto out; 217 218 rsii.h.flags = 0; 219 /* expiry */ 220 expiry = get_expiry(&mesg); 221 status = -EINVAL; 222 if (expiry == 0) 223 goto out; 224 225 /* major/minor */ 226 len = qword_get(&mesg, buf, mlen); 227 if (len <= 0) 228 goto out; 229 rsii.major_status = simple_strtoul(buf, &ep, 10); 230 if (*ep) 231 goto out; 232 len = qword_get(&mesg, buf, mlen); 233 if (len <= 0) 234 goto out; 235 rsii.minor_status = simple_strtoul(buf, &ep, 10); 236 if (*ep) 237 goto out; 238 239 /* out_handle */ 240 len = qword_get(&mesg, buf, mlen); 241 if (len < 0) 242 goto out; 243 status = -ENOMEM; 244 if (dup_to_netobj(&rsii.out_handle, buf, len)) 245 goto out; 246 247 /* out_token */ 248 len = qword_get(&mesg, buf, mlen); 249 status = -EINVAL; 250 if (len < 0) 251 goto out; 252 status = -ENOMEM; 253 if (dup_to_netobj(&rsii.out_token, buf, len)) 254 goto out; 255 rsii.h.expiry_time = expiry; 256 rsip = rsi_update(cd, &rsii, rsip); 257 status = 0; 258 out: 259 rsi_free(&rsii); 260 if (rsip) 261 cache_put(&rsip->h, cd); 262 else 263 status = -ENOMEM; 264 return status; 265 } 266 267 static struct cache_detail rsi_cache_template = { 268 .owner = THIS_MODULE, 269 .hash_size = RSI_HASHMAX, 270 .name = "auth.rpcsec.init", 271 .cache_put = rsi_put, 272 .cache_request = rsi_request, 273 .cache_parse = rsi_parse, 274 .match = rsi_match, 275 .init = rsi_init, 276 .update = update_rsi, 277 .alloc = rsi_alloc, 278 }; 279 280 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item) 281 { 282 struct cache_head *ch; 283 int hash = rsi_hash(item); 284 285 ch = sunrpc_cache_lookup(cd, &item->h, hash); 286 if (ch) 287 return container_of(ch, struct rsi, h); 288 else 289 return NULL; 290 } 291 292 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old) 293 { 294 struct cache_head *ch; 295 int hash = rsi_hash(new); 296 297 ch = sunrpc_cache_update(cd, &new->h, 298 &old->h, hash); 299 if (ch) 300 return container_of(ch, struct rsi, h); 301 else 302 return NULL; 303 } 304 305 306 /* 307 * The rpcsec_context cache is used to store a context that is 308 * used in data exchange. 309 * The key is a context handle. The content is: 310 * uid, gidlist, mechanism, service-set, mech-specific-data 311 */ 312 313 #define RSC_HASHBITS 10 314 #define RSC_HASHMAX (1<<RSC_HASHBITS) 315 316 #define GSS_SEQ_WIN 128 317 318 struct gss_svc_seq_data { 319 /* highest seq number seen so far: */ 320 int sd_max; 321 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of 322 * sd_win is nonzero iff sequence number i has been seen already: */ 323 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; 324 spinlock_t sd_lock; 325 }; 326 327 struct rsc { 328 struct cache_head h; 329 struct xdr_netobj handle; 330 struct svc_cred cred; 331 struct gss_svc_seq_data seqdata; 332 struct gss_ctx *mechctx; 333 }; 334 335 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old); 336 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item); 337 338 static void rsc_free(struct rsc *rsci) 339 { 340 kfree(rsci->handle.data); 341 if (rsci->mechctx) 342 gss_delete_sec_context(&rsci->mechctx); 343 free_svc_cred(&rsci->cred); 344 } 345 346 static void rsc_put(struct kref *ref) 347 { 348 struct rsc *rsci = container_of(ref, struct rsc, h.ref); 349 350 rsc_free(rsci); 351 kfree(rsci); 352 } 353 354 static inline int 355 rsc_hash(struct rsc *rsci) 356 { 357 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); 358 } 359 360 static int 361 rsc_match(struct cache_head *a, struct cache_head *b) 362 { 363 struct rsc *new = container_of(a, struct rsc, h); 364 struct rsc *tmp = container_of(b, struct rsc, h); 365 366 return netobj_equal(&new->handle, &tmp->handle); 367 } 368 369 static void 370 rsc_init(struct cache_head *cnew, struct cache_head *ctmp) 371 { 372 struct rsc *new = container_of(cnew, struct rsc, h); 373 struct rsc *tmp = container_of(ctmp, struct rsc, h); 374 375 new->handle.len = tmp->handle.len; 376 tmp->handle.len = 0; 377 new->handle.data = tmp->handle.data; 378 tmp->handle.data = NULL; 379 new->mechctx = NULL; 380 new->cred.cr_group_info = NULL; 381 new->cred.cr_principal = NULL; 382 } 383 384 static void 385 update_rsc(struct cache_head *cnew, struct cache_head *ctmp) 386 { 387 struct rsc *new = container_of(cnew, struct rsc, h); 388 struct rsc *tmp = container_of(ctmp, struct rsc, h); 389 390 new->mechctx = tmp->mechctx; 391 tmp->mechctx = NULL; 392 memset(&new->seqdata, 0, sizeof(new->seqdata)); 393 spin_lock_init(&new->seqdata.sd_lock); 394 new->cred = tmp->cred; 395 tmp->cred.cr_group_info = NULL; 396 new->cred.cr_principal = tmp->cred.cr_principal; 397 tmp->cred.cr_principal = NULL; 398 } 399 400 static struct cache_head * 401 rsc_alloc(void) 402 { 403 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); 404 if (rsci) 405 return &rsci->h; 406 else 407 return NULL; 408 } 409 410 static int rsc_parse(struct cache_detail *cd, 411 char *mesg, int mlen) 412 { 413 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ 414 char *buf = mesg; 415 int len, rv; 416 struct rsc rsci, *rscp = NULL; 417 time_t expiry; 418 int status = -EINVAL; 419 struct gss_api_mech *gm = NULL; 420 421 memset(&rsci, 0, sizeof(rsci)); 422 /* context handle */ 423 len = qword_get(&mesg, buf, mlen); 424 if (len < 0) goto out; 425 status = -ENOMEM; 426 if (dup_to_netobj(&rsci.handle, buf, len)) 427 goto out; 428 429 rsci.h.flags = 0; 430 /* expiry */ 431 expiry = get_expiry(&mesg); 432 status = -EINVAL; 433 if (expiry == 0) 434 goto out; 435 436 rscp = rsc_lookup(cd, &rsci); 437 if (!rscp) 438 goto out; 439 440 /* uid, or NEGATIVE */ 441 rv = get_int(&mesg, &rsci.cred.cr_uid); 442 if (rv == -EINVAL) 443 goto out; 444 if (rv == -ENOENT) 445 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 446 else { 447 int N, i; 448 449 /* gid */ 450 if (get_int(&mesg, &rsci.cred.cr_gid)) 451 goto out; 452 453 /* number of additional gid's */ 454 if (get_int(&mesg, &N)) 455 goto out; 456 status = -ENOMEM; 457 rsci.cred.cr_group_info = groups_alloc(N); 458 if (rsci.cred.cr_group_info == NULL) 459 goto out; 460 461 /* gid's */ 462 status = -EINVAL; 463 for (i=0; i<N; i++) { 464 gid_t gid; 465 kgid_t kgid; 466 if (get_int(&mesg, &gid)) 467 goto out; 468 kgid = make_kgid(&init_user_ns, gid); 469 if (!gid_valid(kgid)) 470 goto out; 471 GROUP_AT(rsci.cred.cr_group_info, i) = kgid; 472 } 473 474 /* mech name */ 475 len = qword_get(&mesg, buf, mlen); 476 if (len < 0) 477 goto out; 478 gm = gss_mech_get_by_name(buf); 479 status = -EOPNOTSUPP; 480 if (!gm) 481 goto out; 482 483 status = -EINVAL; 484 /* mech-specific data: */ 485 len = qword_get(&mesg, buf, mlen); 486 if (len < 0) 487 goto out; 488 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, GFP_KERNEL); 489 if (status) 490 goto out; 491 492 /* get client name */ 493 len = qword_get(&mesg, buf, mlen); 494 if (len > 0) { 495 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL); 496 if (!rsci.cred.cr_principal) 497 goto out; 498 } 499 500 } 501 rsci.h.expiry_time = expiry; 502 rscp = rsc_update(cd, &rsci, rscp); 503 status = 0; 504 out: 505 gss_mech_put(gm); 506 rsc_free(&rsci); 507 if (rscp) 508 cache_put(&rscp->h, cd); 509 else 510 status = -ENOMEM; 511 return status; 512 } 513 514 static struct cache_detail rsc_cache_template = { 515 .owner = THIS_MODULE, 516 .hash_size = RSC_HASHMAX, 517 .name = "auth.rpcsec.context", 518 .cache_put = rsc_put, 519 .cache_parse = rsc_parse, 520 .match = rsc_match, 521 .init = rsc_init, 522 .update = update_rsc, 523 .alloc = rsc_alloc, 524 }; 525 526 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) 527 { 528 struct cache_head *ch; 529 int hash = rsc_hash(item); 530 531 ch = sunrpc_cache_lookup(cd, &item->h, hash); 532 if (ch) 533 return container_of(ch, struct rsc, h); 534 else 535 return NULL; 536 } 537 538 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) 539 { 540 struct cache_head *ch; 541 int hash = rsc_hash(new); 542 543 ch = sunrpc_cache_update(cd, &new->h, 544 &old->h, hash); 545 if (ch) 546 return container_of(ch, struct rsc, h); 547 else 548 return NULL; 549 } 550 551 552 static struct rsc * 553 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) 554 { 555 struct rsc rsci; 556 struct rsc *found; 557 558 memset(&rsci, 0, sizeof(rsci)); 559 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 560 return NULL; 561 found = rsc_lookup(cd, &rsci); 562 rsc_free(&rsci); 563 if (!found) 564 return NULL; 565 if (cache_check(cd, &found->h, NULL)) 566 return NULL; 567 return found; 568 } 569 570 /* Implements sequence number algorithm as specified in RFC 2203. */ 571 static int 572 gss_check_seq_num(struct rsc *rsci, int seq_num) 573 { 574 struct gss_svc_seq_data *sd = &rsci->seqdata; 575 576 spin_lock(&sd->sd_lock); 577 if (seq_num > sd->sd_max) { 578 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 579 memset(sd->sd_win,0,sizeof(sd->sd_win)); 580 sd->sd_max = seq_num; 581 } else while (sd->sd_max < seq_num) { 582 sd->sd_max++; 583 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 584 } 585 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 586 goto ok; 587 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 588 goto drop; 589 } 590 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 591 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 592 goto drop; 593 ok: 594 spin_unlock(&sd->sd_lock); 595 return 1; 596 drop: 597 spin_unlock(&sd->sd_lock); 598 return 0; 599 } 600 601 static inline u32 round_up_to_quad(u32 i) 602 { 603 return (i + 3 ) & ~3; 604 } 605 606 static inline int 607 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 608 { 609 int l; 610 611 if (argv->iov_len < 4) 612 return -1; 613 o->len = svc_getnl(argv); 614 l = round_up_to_quad(o->len); 615 if (argv->iov_len < l) 616 return -1; 617 o->data = argv->iov_base; 618 argv->iov_base += l; 619 argv->iov_len -= l; 620 return 0; 621 } 622 623 static inline int 624 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 625 { 626 u8 *p; 627 628 if (resv->iov_len + 4 > PAGE_SIZE) 629 return -1; 630 svc_putnl(resv, o->len); 631 p = resv->iov_base + resv->iov_len; 632 resv->iov_len += round_up_to_quad(o->len); 633 if (resv->iov_len > PAGE_SIZE) 634 return -1; 635 memcpy(p, o->data, o->len); 636 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 637 return 0; 638 } 639 640 /* 641 * Verify the checksum on the header and return SVC_OK on success. 642 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 643 * or return SVC_DENIED and indicate error in authp. 644 */ 645 static int 646 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 647 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 648 { 649 struct gss_ctx *ctx_id = rsci->mechctx; 650 struct xdr_buf rpchdr; 651 struct xdr_netobj checksum; 652 u32 flavor = 0; 653 struct kvec *argv = &rqstp->rq_arg.head[0]; 654 struct kvec iov; 655 656 /* data to compute the checksum over: */ 657 iov.iov_base = rpcstart; 658 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 659 xdr_buf_from_iov(&iov, &rpchdr); 660 661 *authp = rpc_autherr_badverf; 662 if (argv->iov_len < 4) 663 return SVC_DENIED; 664 flavor = svc_getnl(argv); 665 if (flavor != RPC_AUTH_GSS) 666 return SVC_DENIED; 667 if (svc_safe_getnetobj(argv, &checksum)) 668 return SVC_DENIED; 669 670 if (rqstp->rq_deferred) /* skip verification of revisited request */ 671 return SVC_OK; 672 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 673 *authp = rpcsec_gsserr_credproblem; 674 return SVC_DENIED; 675 } 676 677 if (gc->gc_seq > MAXSEQ) { 678 dprintk("RPC: svcauth_gss: discarding request with " 679 "large sequence number %d\n", gc->gc_seq); 680 *authp = rpcsec_gsserr_ctxproblem; 681 return SVC_DENIED; 682 } 683 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 684 dprintk("RPC: svcauth_gss: discarding request with " 685 "old sequence number %d\n", gc->gc_seq); 686 return SVC_DROP; 687 } 688 return SVC_OK; 689 } 690 691 static int 692 gss_write_null_verf(struct svc_rqst *rqstp) 693 { 694 __be32 *p; 695 696 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 697 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 698 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 699 *p++ = 0; 700 if (!xdr_ressize_check(rqstp, p)) 701 return -1; 702 return 0; 703 } 704 705 static int 706 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 707 { 708 __be32 xdr_seq; 709 u32 maj_stat; 710 struct xdr_buf verf_data; 711 struct xdr_netobj mic; 712 __be32 *p; 713 struct kvec iov; 714 715 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 716 xdr_seq = htonl(seq); 717 718 iov.iov_base = &xdr_seq; 719 iov.iov_len = sizeof(xdr_seq); 720 xdr_buf_from_iov(&iov, &verf_data); 721 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 722 mic.data = (u8 *)(p + 1); 723 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 724 if (maj_stat != GSS_S_COMPLETE) 725 return -1; 726 *p++ = htonl(mic.len); 727 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 728 p += XDR_QUADLEN(mic.len); 729 if (!xdr_ressize_check(rqstp, p)) 730 return -1; 731 return 0; 732 } 733 734 struct gss_domain { 735 struct auth_domain h; 736 u32 pseudoflavor; 737 }; 738 739 static struct auth_domain * 740 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 741 { 742 char *name; 743 744 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 745 if (!name) 746 return NULL; 747 return auth_domain_find(name); 748 } 749 750 static struct auth_ops svcauthops_gss; 751 752 u32 svcauth_gss_flavor(struct auth_domain *dom) 753 { 754 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 755 756 return gd->pseudoflavor; 757 } 758 759 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 760 761 int 762 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 763 { 764 struct gss_domain *new; 765 struct auth_domain *test; 766 int stat = -ENOMEM; 767 768 new = kmalloc(sizeof(*new), GFP_KERNEL); 769 if (!new) 770 goto out; 771 kref_init(&new->h.ref); 772 new->h.name = kstrdup(name, GFP_KERNEL); 773 if (!new->h.name) 774 goto out_free_dom; 775 new->h.flavour = &svcauthops_gss; 776 new->pseudoflavor = pseudoflavor; 777 778 stat = 0; 779 test = auth_domain_lookup(name, &new->h); 780 if (test != &new->h) { /* Duplicate registration */ 781 auth_domain_put(test); 782 kfree(new->h.name); 783 goto out_free_dom; 784 } 785 return 0; 786 787 out_free_dom: 788 kfree(new); 789 out: 790 return stat; 791 } 792 793 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 794 795 static inline int 796 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 797 { 798 __be32 raw; 799 int status; 800 801 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 802 if (status) 803 return status; 804 *obj = ntohl(raw); 805 return 0; 806 } 807 808 /* It would be nice if this bit of code could be shared with the client. 809 * Obstacles: 810 * The client shouldn't malloc(), would have to pass in own memory. 811 * The server uses base of head iovec as read pointer, while the 812 * client uses separate pointer. */ 813 static int 814 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 815 { 816 int stat = -EINVAL; 817 u32 integ_len, maj_stat; 818 struct xdr_netobj mic; 819 struct xdr_buf integ_buf; 820 821 /* Did we already verify the signature on the original pass through? */ 822 if (rqstp->rq_deferred) 823 return 0; 824 825 integ_len = svc_getnl(&buf->head[0]); 826 if (integ_len & 3) 827 return stat; 828 if (integ_len > buf->len) 829 return stat; 830 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 831 BUG(); 832 /* copy out mic... */ 833 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 834 BUG(); 835 if (mic.len > RPC_MAX_AUTH_SIZE) 836 return stat; 837 mic.data = kmalloc(mic.len, GFP_KERNEL); 838 if (!mic.data) 839 return stat; 840 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 841 goto out; 842 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 843 if (maj_stat != GSS_S_COMPLETE) 844 goto out; 845 if (svc_getnl(&buf->head[0]) != seq) 846 goto out; 847 /* trim off the mic at the end before returning */ 848 xdr_buf_trim(buf, mic.len + 4); 849 stat = 0; 850 out: 851 kfree(mic.data); 852 return stat; 853 } 854 855 static inline int 856 total_buf_len(struct xdr_buf *buf) 857 { 858 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 859 } 860 861 static void 862 fix_priv_head(struct xdr_buf *buf, int pad) 863 { 864 if (buf->page_len == 0) { 865 /* We need to adjust head and buf->len in tandem in this 866 * case to make svc_defer() work--it finds the original 867 * buffer start using buf->len - buf->head[0].iov_len. */ 868 buf->head[0].iov_len -= pad; 869 } 870 } 871 872 static int 873 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 874 { 875 u32 priv_len, maj_stat; 876 int pad, saved_len, remaining_len, offset; 877 878 rqstp->rq_splice_ok = 0; 879 880 priv_len = svc_getnl(&buf->head[0]); 881 if (rqstp->rq_deferred) { 882 /* Already decrypted last time through! The sequence number 883 * check at out_seq is unnecessary but harmless: */ 884 goto out_seq; 885 } 886 /* buf->len is the number of bytes from the original start of the 887 * request to the end, where head[0].iov_len is just the bytes 888 * not yet read from the head, so these two values are different: */ 889 remaining_len = total_buf_len(buf); 890 if (priv_len > remaining_len) 891 return -EINVAL; 892 pad = remaining_len - priv_len; 893 buf->len -= pad; 894 fix_priv_head(buf, pad); 895 896 /* Maybe it would be better to give gss_unwrap a length parameter: */ 897 saved_len = buf->len; 898 buf->len = priv_len; 899 maj_stat = gss_unwrap(ctx, 0, buf); 900 pad = priv_len - buf->len; 901 buf->len = saved_len; 902 buf->len -= pad; 903 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 904 * In the krb5p case, at least, the data ends up offset, so we need to 905 * move it around. */ 906 /* XXX: This is very inefficient. It would be better to either do 907 * this while we encrypt, or maybe in the receive code, if we can peak 908 * ahead and work out the service and mechanism there. */ 909 offset = buf->head[0].iov_len % 4; 910 if (offset) { 911 buf->buflen = RPCSVC_MAXPAYLOAD; 912 xdr_shift_buf(buf, offset); 913 fix_priv_head(buf, pad); 914 } 915 if (maj_stat != GSS_S_COMPLETE) 916 return -EINVAL; 917 out_seq: 918 if (svc_getnl(&buf->head[0]) != seq) 919 return -EINVAL; 920 return 0; 921 } 922 923 struct gss_svc_data { 924 /* decoded gss client cred: */ 925 struct rpc_gss_wire_cred clcred; 926 /* save a pointer to the beginning of the encoded verifier, 927 * for use in encryption/checksumming in svcauth_gss_release: */ 928 __be32 *verf_start; 929 struct rsc *rsci; 930 }; 931 932 static int 933 svcauth_gss_set_client(struct svc_rqst *rqstp) 934 { 935 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 936 struct rsc *rsci = svcdata->rsci; 937 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 938 int stat; 939 940 /* 941 * A gss export can be specified either by: 942 * export *(sec=krb5,rw) 943 * or by 944 * export gss/krb5(rw) 945 * The latter is deprecated; but for backwards compatibility reasons 946 * the nfsd code will still fall back on trying it if the former 947 * doesn't work; so we try to make both available to nfsd, below. 948 */ 949 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 950 if (rqstp->rq_gssclient == NULL) 951 return SVC_DENIED; 952 stat = svcauth_unix_set_client(rqstp); 953 if (stat == SVC_DROP || stat == SVC_CLOSE) 954 return stat; 955 return SVC_OK; 956 } 957 958 static inline int 959 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, 960 struct xdr_netobj *out_handle, int *major_status) 961 { 962 struct rsc *rsci; 963 int rc; 964 965 if (*major_status != GSS_S_COMPLETE) 966 return gss_write_null_verf(rqstp); 967 rsci = gss_svc_searchbyctx(cd, out_handle); 968 if (rsci == NULL) { 969 *major_status = GSS_S_NO_CONTEXT; 970 return gss_write_null_verf(rqstp); 971 } 972 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 973 cache_put(&rsci->h, cd); 974 return rc; 975 } 976 977 static inline int 978 gss_read_verf(struct rpc_gss_wire_cred *gc, 979 struct kvec *argv, __be32 *authp, 980 struct xdr_netobj *in_handle, 981 struct xdr_netobj *in_token) 982 { 983 struct xdr_netobj tmpobj; 984 985 /* Read the verifier; should be NULL: */ 986 *authp = rpc_autherr_badverf; 987 if (argv->iov_len < 2 * 4) 988 return SVC_DENIED; 989 if (svc_getnl(argv) != RPC_AUTH_NULL) 990 return SVC_DENIED; 991 if (svc_getnl(argv) != 0) 992 return SVC_DENIED; 993 /* Martial context handle and token for upcall: */ 994 *authp = rpc_autherr_badcred; 995 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 996 return SVC_DENIED; 997 if (dup_netobj(in_handle, &gc->gc_ctx)) 998 return SVC_CLOSE; 999 *authp = rpc_autherr_badverf; 1000 if (svc_safe_getnetobj(argv, &tmpobj)) { 1001 kfree(in_handle->data); 1002 return SVC_DENIED; 1003 } 1004 if (dup_netobj(in_token, &tmpobj)) { 1005 kfree(in_handle->data); 1006 return SVC_CLOSE; 1007 } 1008 1009 return 0; 1010 } 1011 1012 static inline int 1013 gss_write_resv(struct kvec *resv, size_t size_limit, 1014 struct xdr_netobj *out_handle, struct xdr_netobj *out_token, 1015 int major_status, int minor_status) 1016 { 1017 if (resv->iov_len + 4 > size_limit) 1018 return -1; 1019 svc_putnl(resv, RPC_SUCCESS); 1020 if (svc_safe_putnetobj(resv, out_handle)) 1021 return -1; 1022 if (resv->iov_len + 3 * 4 > size_limit) 1023 return -1; 1024 svc_putnl(resv, major_status); 1025 svc_putnl(resv, minor_status); 1026 svc_putnl(resv, GSS_SEQ_WIN); 1027 if (svc_safe_putnetobj(resv, out_token)) 1028 return -1; 1029 return 0; 1030 } 1031 1032 /* 1033 * Having read the cred already and found we're in the context 1034 * initiation case, read the verifier and initiate (or check the results 1035 * of) upcalls to userspace for help with context initiation. If 1036 * the upcall results are available, write the verifier and result. 1037 * Otherwise, drop the request pending an answer to the upcall. 1038 */ 1039 static int svcauth_gss_handle_init(struct svc_rqst *rqstp, 1040 struct rpc_gss_wire_cred *gc, __be32 *authp) 1041 { 1042 struct kvec *argv = &rqstp->rq_arg.head[0]; 1043 struct kvec *resv = &rqstp->rq_res.head[0]; 1044 struct rsi *rsip, rsikey; 1045 int ret; 1046 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1047 1048 memset(&rsikey, 0, sizeof(rsikey)); 1049 ret = gss_read_verf(gc, argv, authp, 1050 &rsikey.in_handle, &rsikey.in_token); 1051 if (ret) 1052 return ret; 1053 1054 /* Perform upcall, or find upcall result: */ 1055 rsip = rsi_lookup(sn->rsi_cache, &rsikey); 1056 rsi_free(&rsikey); 1057 if (!rsip) 1058 return SVC_CLOSE; 1059 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 1060 /* No upcall result: */ 1061 return SVC_CLOSE; 1062 1063 ret = SVC_CLOSE; 1064 /* Got an answer to the upcall; use it: */ 1065 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1066 &rsip->out_handle, &rsip->major_status)) 1067 goto out; 1068 if (gss_write_resv(resv, PAGE_SIZE, 1069 &rsip->out_handle, &rsip->out_token, 1070 rsip->major_status, rsip->minor_status)) 1071 goto out; 1072 1073 ret = SVC_COMPLETE; 1074 out: 1075 cache_put(&rsip->h, sn->rsi_cache); 1076 return ret; 1077 } 1078 1079 /* 1080 * Accept an rpcsec packet. 1081 * If context establishment, punt to user space 1082 * If data exchange, verify/decrypt 1083 * If context destruction, handle here 1084 * In the context establishment and destruction case we encode 1085 * response here and return SVC_COMPLETE. 1086 */ 1087 static int 1088 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 1089 { 1090 struct kvec *argv = &rqstp->rq_arg.head[0]; 1091 struct kvec *resv = &rqstp->rq_res.head[0]; 1092 u32 crlen; 1093 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1094 struct rpc_gss_wire_cred *gc; 1095 struct rsc *rsci = NULL; 1096 __be32 *rpcstart; 1097 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1098 int ret; 1099 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1100 1101 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 1102 argv->iov_len); 1103 1104 *authp = rpc_autherr_badcred; 1105 if (!svcdata) 1106 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1107 if (!svcdata) 1108 goto auth_err; 1109 rqstp->rq_auth_data = svcdata; 1110 svcdata->verf_start = NULL; 1111 svcdata->rsci = NULL; 1112 gc = &svcdata->clcred; 1113 1114 /* start of rpc packet is 7 u32's back from here: 1115 * xid direction rpcversion prog vers proc flavour 1116 */ 1117 rpcstart = argv->iov_base; 1118 rpcstart -= 7; 1119 1120 /* credential is: 1121 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1122 * at least 5 u32s, and is preceded by length, so that makes 6. 1123 */ 1124 1125 if (argv->iov_len < 5 * 4) 1126 goto auth_err; 1127 crlen = svc_getnl(argv); 1128 if (svc_getnl(argv) != RPC_GSS_VERSION) 1129 goto auth_err; 1130 gc->gc_proc = svc_getnl(argv); 1131 gc->gc_seq = svc_getnl(argv); 1132 gc->gc_svc = svc_getnl(argv); 1133 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1134 goto auth_err; 1135 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1136 goto auth_err; 1137 1138 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1139 goto auth_err; 1140 1141 *authp = rpc_autherr_badverf; 1142 switch (gc->gc_proc) { 1143 case RPC_GSS_PROC_INIT: 1144 case RPC_GSS_PROC_CONTINUE_INIT: 1145 return svcauth_gss_handle_init(rqstp, gc, authp); 1146 case RPC_GSS_PROC_DATA: 1147 case RPC_GSS_PROC_DESTROY: 1148 /* Look up the context, and check the verifier: */ 1149 *authp = rpcsec_gsserr_credproblem; 1150 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 1151 if (!rsci) 1152 goto auth_err; 1153 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1154 case SVC_OK: 1155 break; 1156 case SVC_DENIED: 1157 goto auth_err; 1158 case SVC_DROP: 1159 goto drop; 1160 } 1161 break; 1162 default: 1163 *authp = rpc_autherr_rejectedcred; 1164 goto auth_err; 1165 } 1166 1167 /* now act upon the command: */ 1168 switch (gc->gc_proc) { 1169 case RPC_GSS_PROC_DESTROY: 1170 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1171 goto auth_err; 1172 rsci->h.expiry_time = get_seconds(); 1173 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1174 if (resv->iov_len + 4 > PAGE_SIZE) 1175 goto drop; 1176 svc_putnl(resv, RPC_SUCCESS); 1177 goto complete; 1178 case RPC_GSS_PROC_DATA: 1179 *authp = rpcsec_gsserr_ctxproblem; 1180 svcdata->verf_start = resv->iov_base + resv->iov_len; 1181 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1182 goto auth_err; 1183 rqstp->rq_cred = rsci->cred; 1184 get_group_info(rsci->cred.cr_group_info); 1185 *authp = rpc_autherr_badcred; 1186 switch (gc->gc_svc) { 1187 case RPC_GSS_SVC_NONE: 1188 break; 1189 case RPC_GSS_SVC_INTEGRITY: 1190 /* placeholders for length and seq. number: */ 1191 svc_putnl(resv, 0); 1192 svc_putnl(resv, 0); 1193 if (unwrap_integ_data(rqstp, &rqstp->rq_arg, 1194 gc->gc_seq, rsci->mechctx)) 1195 goto garbage_args; 1196 break; 1197 case RPC_GSS_SVC_PRIVACY: 1198 /* placeholders for length and seq. number: */ 1199 svc_putnl(resv, 0); 1200 svc_putnl(resv, 0); 1201 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1202 gc->gc_seq, rsci->mechctx)) 1203 goto garbage_args; 1204 break; 1205 default: 1206 goto auth_err; 1207 } 1208 svcdata->rsci = rsci; 1209 cache_get(&rsci->h); 1210 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( 1211 rsci->mechctx->mech_type, gc->gc_svc); 1212 ret = SVC_OK; 1213 goto out; 1214 } 1215 garbage_args: 1216 ret = SVC_GARBAGE; 1217 goto out; 1218 auth_err: 1219 /* Restore write pointer to its original value: */ 1220 xdr_ressize_check(rqstp, reject_stat); 1221 ret = SVC_DENIED; 1222 goto out; 1223 complete: 1224 ret = SVC_COMPLETE; 1225 goto out; 1226 drop: 1227 ret = SVC_DROP; 1228 out: 1229 if (rsci) 1230 cache_put(&rsci->h, sn->rsc_cache); 1231 return ret; 1232 } 1233 1234 static __be32 * 1235 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1236 { 1237 __be32 *p; 1238 u32 verf_len; 1239 1240 p = gsd->verf_start; 1241 gsd->verf_start = NULL; 1242 1243 /* If the reply stat is nonzero, don't wrap: */ 1244 if (*(p-1) != rpc_success) 1245 return NULL; 1246 /* Skip the verifier: */ 1247 p += 1; 1248 verf_len = ntohl(*p++); 1249 p += XDR_QUADLEN(verf_len); 1250 /* move accept_stat to right place: */ 1251 memcpy(p, p + 2, 4); 1252 /* Also don't wrap if the accept stat is nonzero: */ 1253 if (*p != rpc_success) { 1254 resbuf->head[0].iov_len -= 2 * 4; 1255 return NULL; 1256 } 1257 p++; 1258 return p; 1259 } 1260 1261 static inline int 1262 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1263 { 1264 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1265 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1266 struct xdr_buf *resbuf = &rqstp->rq_res; 1267 struct xdr_buf integ_buf; 1268 struct xdr_netobj mic; 1269 struct kvec *resv; 1270 __be32 *p; 1271 int integ_offset, integ_len; 1272 int stat = -EINVAL; 1273 1274 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1275 if (p == NULL) 1276 goto out; 1277 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1278 integ_len = resbuf->len - integ_offset; 1279 BUG_ON(integ_len % 4); 1280 *p++ = htonl(integ_len); 1281 *p++ = htonl(gc->gc_seq); 1282 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1283 integ_len)) 1284 BUG(); 1285 if (resbuf->tail[0].iov_base == NULL) { 1286 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1287 goto out_err; 1288 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1289 + resbuf->head[0].iov_len; 1290 resbuf->tail[0].iov_len = 0; 1291 resv = &resbuf->tail[0]; 1292 } else { 1293 resv = &resbuf->tail[0]; 1294 } 1295 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1296 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1297 goto out_err; 1298 svc_putnl(resv, mic.len); 1299 memset(mic.data + mic.len, 0, 1300 round_up_to_quad(mic.len) - mic.len); 1301 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1302 /* not strictly required: */ 1303 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1304 BUG_ON(resv->iov_len > PAGE_SIZE); 1305 out: 1306 stat = 0; 1307 out_err: 1308 return stat; 1309 } 1310 1311 static inline int 1312 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1313 { 1314 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1315 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1316 struct xdr_buf *resbuf = &rqstp->rq_res; 1317 struct page **inpages = NULL; 1318 __be32 *p, *len; 1319 int offset; 1320 int pad; 1321 1322 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1323 if (p == NULL) 1324 return 0; 1325 len = p++; 1326 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1327 *p++ = htonl(gc->gc_seq); 1328 inpages = resbuf->pages; 1329 /* XXX: Would be better to write some xdr helper functions for 1330 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1331 1332 /* 1333 * If there is currently tail data, make sure there is 1334 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1335 * the page, and move the current tail data such that 1336 * there is RPC_MAX_AUTH_SIZE slack space available in 1337 * both the head and tail. 1338 */ 1339 if (resbuf->tail[0].iov_base) { 1340 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1341 + PAGE_SIZE); 1342 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1343 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1344 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1345 return -ENOMEM; 1346 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1347 resbuf->tail[0].iov_base, 1348 resbuf->tail[0].iov_len); 1349 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1350 } 1351 /* 1352 * If there is no current tail data, make sure there is 1353 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1354 * allotted page, and set up tail information such that there 1355 * is RPC_MAX_AUTH_SIZE slack space available in both the 1356 * head and tail. 1357 */ 1358 if (resbuf->tail[0].iov_base == NULL) { 1359 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1360 return -ENOMEM; 1361 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1362 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1363 resbuf->tail[0].iov_len = 0; 1364 } 1365 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1366 return -ENOMEM; 1367 *len = htonl(resbuf->len - offset); 1368 pad = 3 - ((resbuf->len - offset - 1)&3); 1369 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1370 memset(p, 0, pad); 1371 resbuf->tail[0].iov_len += pad; 1372 resbuf->len += pad; 1373 return 0; 1374 } 1375 1376 static int 1377 svcauth_gss_release(struct svc_rqst *rqstp) 1378 { 1379 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1380 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1381 struct xdr_buf *resbuf = &rqstp->rq_res; 1382 int stat = -EINVAL; 1383 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1384 1385 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1386 goto out; 1387 /* Release can be called twice, but we only wrap once. */ 1388 if (gsd->verf_start == NULL) 1389 goto out; 1390 /* normally not set till svc_send, but we need it here: */ 1391 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1392 * or whatever? */ 1393 resbuf->len = total_buf_len(resbuf); 1394 switch (gc->gc_svc) { 1395 case RPC_GSS_SVC_NONE: 1396 break; 1397 case RPC_GSS_SVC_INTEGRITY: 1398 stat = svcauth_gss_wrap_resp_integ(rqstp); 1399 if (stat) 1400 goto out_err; 1401 break; 1402 case RPC_GSS_SVC_PRIVACY: 1403 stat = svcauth_gss_wrap_resp_priv(rqstp); 1404 if (stat) 1405 goto out_err; 1406 break; 1407 /* 1408 * For any other gc_svc value, svcauth_gss_accept() already set 1409 * the auth_error appropriately; just fall through: 1410 */ 1411 } 1412 1413 out: 1414 stat = 0; 1415 out_err: 1416 if (rqstp->rq_client) 1417 auth_domain_put(rqstp->rq_client); 1418 rqstp->rq_client = NULL; 1419 if (rqstp->rq_gssclient) 1420 auth_domain_put(rqstp->rq_gssclient); 1421 rqstp->rq_gssclient = NULL; 1422 if (rqstp->rq_cred.cr_group_info) 1423 put_group_info(rqstp->rq_cred.cr_group_info); 1424 rqstp->rq_cred.cr_group_info = NULL; 1425 if (gsd->rsci) 1426 cache_put(&gsd->rsci->h, sn->rsc_cache); 1427 gsd->rsci = NULL; 1428 1429 return stat; 1430 } 1431 1432 static void 1433 svcauth_gss_domain_release(struct auth_domain *dom) 1434 { 1435 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1436 1437 kfree(dom->name); 1438 kfree(gd); 1439 } 1440 1441 static struct auth_ops svcauthops_gss = { 1442 .name = "rpcsec_gss", 1443 .owner = THIS_MODULE, 1444 .flavour = RPC_AUTH_GSS, 1445 .accept = svcauth_gss_accept, 1446 .release = svcauth_gss_release, 1447 .domain_release = svcauth_gss_domain_release, 1448 .set_client = svcauth_gss_set_client, 1449 }; 1450 1451 static int rsi_cache_create_net(struct net *net) 1452 { 1453 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1454 struct cache_detail *cd; 1455 int err; 1456 1457 cd = cache_create_net(&rsi_cache_template, net); 1458 if (IS_ERR(cd)) 1459 return PTR_ERR(cd); 1460 err = cache_register_net(cd, net); 1461 if (err) { 1462 cache_destroy_net(cd, net); 1463 return err; 1464 } 1465 sn->rsi_cache = cd; 1466 return 0; 1467 } 1468 1469 static void rsi_cache_destroy_net(struct net *net) 1470 { 1471 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1472 struct cache_detail *cd = sn->rsi_cache; 1473 1474 sn->rsi_cache = NULL; 1475 cache_purge(cd); 1476 cache_unregister_net(cd, net); 1477 cache_destroy_net(cd, net); 1478 } 1479 1480 static int rsc_cache_create_net(struct net *net) 1481 { 1482 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1483 struct cache_detail *cd; 1484 int err; 1485 1486 cd = cache_create_net(&rsc_cache_template, net); 1487 if (IS_ERR(cd)) 1488 return PTR_ERR(cd); 1489 err = cache_register_net(cd, net); 1490 if (err) { 1491 cache_destroy_net(cd, net); 1492 return err; 1493 } 1494 sn->rsc_cache = cd; 1495 return 0; 1496 } 1497 1498 static void rsc_cache_destroy_net(struct net *net) 1499 { 1500 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1501 struct cache_detail *cd = sn->rsc_cache; 1502 1503 sn->rsc_cache = NULL; 1504 cache_purge(cd); 1505 cache_unregister_net(cd, net); 1506 cache_destroy_net(cd, net); 1507 } 1508 1509 int 1510 gss_svc_init_net(struct net *net) 1511 { 1512 int rv; 1513 1514 rv = rsc_cache_create_net(net); 1515 if (rv) 1516 return rv; 1517 rv = rsi_cache_create_net(net); 1518 if (rv) 1519 goto out1; 1520 return 0; 1521 out1: 1522 rsc_cache_destroy_net(net); 1523 return rv; 1524 } 1525 1526 void 1527 gss_svc_shutdown_net(struct net *net) 1528 { 1529 rsi_cache_destroy_net(net); 1530 rsc_cache_destroy_net(net); 1531 } 1532 1533 int 1534 gss_svc_init(void) 1535 { 1536 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1537 } 1538 1539 void 1540 gss_svc_shutdown(void) 1541 { 1542 svc_auth_unregister(RPC_AUTH_GSS); 1543 } 1544