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 id; 416 int len, rv; 417 struct rsc rsci, *rscp = NULL; 418 time_t expiry; 419 int status = -EINVAL; 420 struct gss_api_mech *gm = NULL; 421 422 memset(&rsci, 0, sizeof(rsci)); 423 /* context handle */ 424 len = qword_get(&mesg, buf, mlen); 425 if (len < 0) goto out; 426 status = -ENOMEM; 427 if (dup_to_netobj(&rsci.handle, buf, len)) 428 goto out; 429 430 rsci.h.flags = 0; 431 /* expiry */ 432 expiry = get_expiry(&mesg); 433 status = -EINVAL; 434 if (expiry == 0) 435 goto out; 436 437 rscp = rsc_lookup(cd, &rsci); 438 if (!rscp) 439 goto out; 440 441 /* uid, or NEGATIVE */ 442 rv = get_int(&mesg, &id); 443 if (rv == -EINVAL) 444 goto out; 445 if (rv == -ENOENT) 446 set_bit(CACHE_NEGATIVE, &rsci.h.flags); 447 else { 448 int N, i; 449 450 /* 451 * NOTE: we skip uid_valid()/gid_valid() checks here: 452 * instead, * -1 id's are later mapped to the 453 * (export-specific) anonymous id by nfsd_setuser. 454 * 455 * (But supplementary gid's get no such special 456 * treatment so are checked for validity here.) 457 */ 458 /* uid */ 459 rsci.cred.cr_uid = make_kuid(&init_user_ns, id); 460 461 /* gid */ 462 if (get_int(&mesg, &id)) 463 goto out; 464 rsci.cred.cr_gid = make_kgid(&init_user_ns, id); 465 466 /* number of additional gid's */ 467 if (get_int(&mesg, &N)) 468 goto out; 469 status = -ENOMEM; 470 rsci.cred.cr_group_info = groups_alloc(N); 471 if (rsci.cred.cr_group_info == NULL) 472 goto out; 473 474 /* gid's */ 475 status = -EINVAL; 476 for (i=0; i<N; i++) { 477 kgid_t kgid; 478 if (get_int(&mesg, &id)) 479 goto out; 480 kgid = make_kgid(&init_user_ns, id); 481 if (!gid_valid(kgid)) 482 goto out; 483 GROUP_AT(rsci.cred.cr_group_info, i) = kgid; 484 } 485 486 /* mech name */ 487 len = qword_get(&mesg, buf, mlen); 488 if (len < 0) 489 goto out; 490 gm = gss_mech_get_by_name(buf); 491 status = -EOPNOTSUPP; 492 if (!gm) 493 goto out; 494 495 status = -EINVAL; 496 /* mech-specific data: */ 497 len = qword_get(&mesg, buf, mlen); 498 if (len < 0) 499 goto out; 500 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, GFP_KERNEL); 501 if (status) 502 goto out; 503 504 /* get client name */ 505 len = qword_get(&mesg, buf, mlen); 506 if (len > 0) { 507 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL); 508 if (!rsci.cred.cr_principal) 509 goto out; 510 } 511 512 } 513 rsci.h.expiry_time = expiry; 514 rscp = rsc_update(cd, &rsci, rscp); 515 status = 0; 516 out: 517 gss_mech_put(gm); 518 rsc_free(&rsci); 519 if (rscp) 520 cache_put(&rscp->h, cd); 521 else 522 status = -ENOMEM; 523 return status; 524 } 525 526 static struct cache_detail rsc_cache_template = { 527 .owner = THIS_MODULE, 528 .hash_size = RSC_HASHMAX, 529 .name = "auth.rpcsec.context", 530 .cache_put = rsc_put, 531 .cache_parse = rsc_parse, 532 .match = rsc_match, 533 .init = rsc_init, 534 .update = update_rsc, 535 .alloc = rsc_alloc, 536 }; 537 538 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) 539 { 540 struct cache_head *ch; 541 int hash = rsc_hash(item); 542 543 ch = sunrpc_cache_lookup(cd, &item->h, hash); 544 if (ch) 545 return container_of(ch, struct rsc, h); 546 else 547 return NULL; 548 } 549 550 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) 551 { 552 struct cache_head *ch; 553 int hash = rsc_hash(new); 554 555 ch = sunrpc_cache_update(cd, &new->h, 556 &old->h, hash); 557 if (ch) 558 return container_of(ch, struct rsc, h); 559 else 560 return NULL; 561 } 562 563 564 static struct rsc * 565 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) 566 { 567 struct rsc rsci; 568 struct rsc *found; 569 570 memset(&rsci, 0, sizeof(rsci)); 571 if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) 572 return NULL; 573 found = rsc_lookup(cd, &rsci); 574 rsc_free(&rsci); 575 if (!found) 576 return NULL; 577 if (cache_check(cd, &found->h, NULL)) 578 return NULL; 579 return found; 580 } 581 582 /* Implements sequence number algorithm as specified in RFC 2203. */ 583 static int 584 gss_check_seq_num(struct rsc *rsci, int seq_num) 585 { 586 struct gss_svc_seq_data *sd = &rsci->seqdata; 587 588 spin_lock(&sd->sd_lock); 589 if (seq_num > sd->sd_max) { 590 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { 591 memset(sd->sd_win,0,sizeof(sd->sd_win)); 592 sd->sd_max = seq_num; 593 } else while (sd->sd_max < seq_num) { 594 sd->sd_max++; 595 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); 596 } 597 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); 598 goto ok; 599 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { 600 goto drop; 601 } 602 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ 603 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) 604 goto drop; 605 ok: 606 spin_unlock(&sd->sd_lock); 607 return 1; 608 drop: 609 spin_unlock(&sd->sd_lock); 610 return 0; 611 } 612 613 static inline u32 round_up_to_quad(u32 i) 614 { 615 return (i + 3 ) & ~3; 616 } 617 618 static inline int 619 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) 620 { 621 int l; 622 623 if (argv->iov_len < 4) 624 return -1; 625 o->len = svc_getnl(argv); 626 l = round_up_to_quad(o->len); 627 if (argv->iov_len < l) 628 return -1; 629 o->data = argv->iov_base; 630 argv->iov_base += l; 631 argv->iov_len -= l; 632 return 0; 633 } 634 635 static inline int 636 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) 637 { 638 u8 *p; 639 640 if (resv->iov_len + 4 > PAGE_SIZE) 641 return -1; 642 svc_putnl(resv, o->len); 643 p = resv->iov_base + resv->iov_len; 644 resv->iov_len += round_up_to_quad(o->len); 645 if (resv->iov_len > PAGE_SIZE) 646 return -1; 647 memcpy(p, o->data, o->len); 648 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); 649 return 0; 650 } 651 652 /* 653 * Verify the checksum on the header and return SVC_OK on success. 654 * Otherwise, return SVC_DROP (in the case of a bad sequence number) 655 * or return SVC_DENIED and indicate error in authp. 656 */ 657 static int 658 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, 659 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) 660 { 661 struct gss_ctx *ctx_id = rsci->mechctx; 662 struct xdr_buf rpchdr; 663 struct xdr_netobj checksum; 664 u32 flavor = 0; 665 struct kvec *argv = &rqstp->rq_arg.head[0]; 666 struct kvec iov; 667 668 /* data to compute the checksum over: */ 669 iov.iov_base = rpcstart; 670 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; 671 xdr_buf_from_iov(&iov, &rpchdr); 672 673 *authp = rpc_autherr_badverf; 674 if (argv->iov_len < 4) 675 return SVC_DENIED; 676 flavor = svc_getnl(argv); 677 if (flavor != RPC_AUTH_GSS) 678 return SVC_DENIED; 679 if (svc_safe_getnetobj(argv, &checksum)) 680 return SVC_DENIED; 681 682 if (rqstp->rq_deferred) /* skip verification of revisited request */ 683 return SVC_OK; 684 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { 685 *authp = rpcsec_gsserr_credproblem; 686 return SVC_DENIED; 687 } 688 689 if (gc->gc_seq > MAXSEQ) { 690 dprintk("RPC: svcauth_gss: discarding request with " 691 "large sequence number %d\n", gc->gc_seq); 692 *authp = rpcsec_gsserr_ctxproblem; 693 return SVC_DENIED; 694 } 695 if (!gss_check_seq_num(rsci, gc->gc_seq)) { 696 dprintk("RPC: svcauth_gss: discarding request with " 697 "old sequence number %d\n", gc->gc_seq); 698 return SVC_DROP; 699 } 700 return SVC_OK; 701 } 702 703 static int 704 gss_write_null_verf(struct svc_rqst *rqstp) 705 { 706 __be32 *p; 707 708 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); 709 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 710 /* don't really need to check if head->iov_len > PAGE_SIZE ... */ 711 *p++ = 0; 712 if (!xdr_ressize_check(rqstp, p)) 713 return -1; 714 return 0; 715 } 716 717 static int 718 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) 719 { 720 __be32 xdr_seq; 721 u32 maj_stat; 722 struct xdr_buf verf_data; 723 struct xdr_netobj mic; 724 __be32 *p; 725 struct kvec iov; 726 727 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); 728 xdr_seq = htonl(seq); 729 730 iov.iov_base = &xdr_seq; 731 iov.iov_len = sizeof(xdr_seq); 732 xdr_buf_from_iov(&iov, &verf_data); 733 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; 734 mic.data = (u8 *)(p + 1); 735 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); 736 if (maj_stat != GSS_S_COMPLETE) 737 return -1; 738 *p++ = htonl(mic.len); 739 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); 740 p += XDR_QUADLEN(mic.len); 741 if (!xdr_ressize_check(rqstp, p)) 742 return -1; 743 return 0; 744 } 745 746 struct gss_domain { 747 struct auth_domain h; 748 u32 pseudoflavor; 749 }; 750 751 static struct auth_domain * 752 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) 753 { 754 char *name; 755 756 name = gss_service_to_auth_domain_name(ctx->mech_type, svc); 757 if (!name) 758 return NULL; 759 return auth_domain_find(name); 760 } 761 762 static struct auth_ops svcauthops_gss; 763 764 u32 svcauth_gss_flavor(struct auth_domain *dom) 765 { 766 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 767 768 return gd->pseudoflavor; 769 } 770 771 EXPORT_SYMBOL_GPL(svcauth_gss_flavor); 772 773 int 774 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) 775 { 776 struct gss_domain *new; 777 struct auth_domain *test; 778 int stat = -ENOMEM; 779 780 new = kmalloc(sizeof(*new), GFP_KERNEL); 781 if (!new) 782 goto out; 783 kref_init(&new->h.ref); 784 new->h.name = kstrdup(name, GFP_KERNEL); 785 if (!new->h.name) 786 goto out_free_dom; 787 new->h.flavour = &svcauthops_gss; 788 new->pseudoflavor = pseudoflavor; 789 790 stat = 0; 791 test = auth_domain_lookup(name, &new->h); 792 if (test != &new->h) { /* Duplicate registration */ 793 auth_domain_put(test); 794 kfree(new->h.name); 795 goto out_free_dom; 796 } 797 return 0; 798 799 out_free_dom: 800 kfree(new); 801 out: 802 return stat; 803 } 804 805 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); 806 807 static inline int 808 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) 809 { 810 __be32 raw; 811 int status; 812 813 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 814 if (status) 815 return status; 816 *obj = ntohl(raw); 817 return 0; 818 } 819 820 /* It would be nice if this bit of code could be shared with the client. 821 * Obstacles: 822 * The client shouldn't malloc(), would have to pass in own memory. 823 * The server uses base of head iovec as read pointer, while the 824 * client uses separate pointer. */ 825 static int 826 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 827 { 828 int stat = -EINVAL; 829 u32 integ_len, maj_stat; 830 struct xdr_netobj mic; 831 struct xdr_buf integ_buf; 832 833 /* Did we already verify the signature on the original pass through? */ 834 if (rqstp->rq_deferred) 835 return 0; 836 837 integ_len = svc_getnl(&buf->head[0]); 838 if (integ_len & 3) 839 return stat; 840 if (integ_len > buf->len) 841 return stat; 842 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) 843 BUG(); 844 /* copy out mic... */ 845 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) 846 BUG(); 847 if (mic.len > RPC_MAX_AUTH_SIZE) 848 return stat; 849 mic.data = kmalloc(mic.len, GFP_KERNEL); 850 if (!mic.data) 851 return stat; 852 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) 853 goto out; 854 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); 855 if (maj_stat != GSS_S_COMPLETE) 856 goto out; 857 if (svc_getnl(&buf->head[0]) != seq) 858 goto out; 859 /* trim off the mic at the end before returning */ 860 xdr_buf_trim(buf, mic.len + 4); 861 stat = 0; 862 out: 863 kfree(mic.data); 864 return stat; 865 } 866 867 static inline int 868 total_buf_len(struct xdr_buf *buf) 869 { 870 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; 871 } 872 873 static void 874 fix_priv_head(struct xdr_buf *buf, int pad) 875 { 876 if (buf->page_len == 0) { 877 /* We need to adjust head and buf->len in tandem in this 878 * case to make svc_defer() work--it finds the original 879 * buffer start using buf->len - buf->head[0].iov_len. */ 880 buf->head[0].iov_len -= pad; 881 } 882 } 883 884 static int 885 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) 886 { 887 u32 priv_len, maj_stat; 888 int pad, saved_len, remaining_len, offset; 889 890 rqstp->rq_splice_ok = 0; 891 892 priv_len = svc_getnl(&buf->head[0]); 893 if (rqstp->rq_deferred) { 894 /* Already decrypted last time through! The sequence number 895 * check at out_seq is unnecessary but harmless: */ 896 goto out_seq; 897 } 898 /* buf->len is the number of bytes from the original start of the 899 * request to the end, where head[0].iov_len is just the bytes 900 * not yet read from the head, so these two values are different: */ 901 remaining_len = total_buf_len(buf); 902 if (priv_len > remaining_len) 903 return -EINVAL; 904 pad = remaining_len - priv_len; 905 buf->len -= pad; 906 fix_priv_head(buf, pad); 907 908 /* Maybe it would be better to give gss_unwrap a length parameter: */ 909 saved_len = buf->len; 910 buf->len = priv_len; 911 maj_stat = gss_unwrap(ctx, 0, buf); 912 pad = priv_len - buf->len; 913 buf->len = saved_len; 914 buf->len -= pad; 915 /* The upper layers assume the buffer is aligned on 4-byte boundaries. 916 * In the krb5p case, at least, the data ends up offset, so we need to 917 * move it around. */ 918 /* XXX: This is very inefficient. It would be better to either do 919 * this while we encrypt, or maybe in the receive code, if we can peak 920 * ahead and work out the service and mechanism there. */ 921 offset = buf->head[0].iov_len % 4; 922 if (offset) { 923 buf->buflen = RPCSVC_MAXPAYLOAD; 924 xdr_shift_buf(buf, offset); 925 fix_priv_head(buf, pad); 926 } 927 if (maj_stat != GSS_S_COMPLETE) 928 return -EINVAL; 929 out_seq: 930 if (svc_getnl(&buf->head[0]) != seq) 931 return -EINVAL; 932 return 0; 933 } 934 935 struct gss_svc_data { 936 /* decoded gss client cred: */ 937 struct rpc_gss_wire_cred clcred; 938 /* save a pointer to the beginning of the encoded verifier, 939 * for use in encryption/checksumming in svcauth_gss_release: */ 940 __be32 *verf_start; 941 struct rsc *rsci; 942 }; 943 944 static int 945 svcauth_gss_set_client(struct svc_rqst *rqstp) 946 { 947 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 948 struct rsc *rsci = svcdata->rsci; 949 struct rpc_gss_wire_cred *gc = &svcdata->clcred; 950 int stat; 951 952 /* 953 * A gss export can be specified either by: 954 * export *(sec=krb5,rw) 955 * or by 956 * export gss/krb5(rw) 957 * The latter is deprecated; but for backwards compatibility reasons 958 * the nfsd code will still fall back on trying it if the former 959 * doesn't work; so we try to make both available to nfsd, below. 960 */ 961 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); 962 if (rqstp->rq_gssclient == NULL) 963 return SVC_DENIED; 964 stat = svcauth_unix_set_client(rqstp); 965 if (stat == SVC_DROP || stat == SVC_CLOSE) 966 return stat; 967 return SVC_OK; 968 } 969 970 static inline int 971 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, 972 struct xdr_netobj *out_handle, int *major_status) 973 { 974 struct rsc *rsci; 975 int rc; 976 977 if (*major_status != GSS_S_COMPLETE) 978 return gss_write_null_verf(rqstp); 979 rsci = gss_svc_searchbyctx(cd, out_handle); 980 if (rsci == NULL) { 981 *major_status = GSS_S_NO_CONTEXT; 982 return gss_write_null_verf(rqstp); 983 } 984 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); 985 cache_put(&rsci->h, cd); 986 return rc; 987 } 988 989 static inline int 990 gss_read_verf(struct rpc_gss_wire_cred *gc, 991 struct kvec *argv, __be32 *authp, 992 struct xdr_netobj *in_handle, 993 struct xdr_netobj *in_token) 994 { 995 struct xdr_netobj tmpobj; 996 997 /* Read the verifier; should be NULL: */ 998 *authp = rpc_autherr_badverf; 999 if (argv->iov_len < 2 * 4) 1000 return SVC_DENIED; 1001 if (svc_getnl(argv) != RPC_AUTH_NULL) 1002 return SVC_DENIED; 1003 if (svc_getnl(argv) != 0) 1004 return SVC_DENIED; 1005 /* Martial context handle and token for upcall: */ 1006 *authp = rpc_autherr_badcred; 1007 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) 1008 return SVC_DENIED; 1009 if (dup_netobj(in_handle, &gc->gc_ctx)) 1010 return SVC_CLOSE; 1011 *authp = rpc_autherr_badverf; 1012 if (svc_safe_getnetobj(argv, &tmpobj)) { 1013 kfree(in_handle->data); 1014 return SVC_DENIED; 1015 } 1016 if (dup_netobj(in_token, &tmpobj)) { 1017 kfree(in_handle->data); 1018 return SVC_CLOSE; 1019 } 1020 1021 return 0; 1022 } 1023 1024 static inline int 1025 gss_write_resv(struct kvec *resv, size_t size_limit, 1026 struct xdr_netobj *out_handle, struct xdr_netobj *out_token, 1027 int major_status, int minor_status) 1028 { 1029 if (resv->iov_len + 4 > size_limit) 1030 return -1; 1031 svc_putnl(resv, RPC_SUCCESS); 1032 if (svc_safe_putnetobj(resv, out_handle)) 1033 return -1; 1034 if (resv->iov_len + 3 * 4 > size_limit) 1035 return -1; 1036 svc_putnl(resv, major_status); 1037 svc_putnl(resv, minor_status); 1038 svc_putnl(resv, GSS_SEQ_WIN); 1039 if (svc_safe_putnetobj(resv, out_token)) 1040 return -1; 1041 return 0; 1042 } 1043 1044 /* 1045 * Having read the cred already and found we're in the context 1046 * initiation case, read the verifier and initiate (or check the results 1047 * of) upcalls to userspace for help with context initiation. If 1048 * the upcall results are available, write the verifier and result. 1049 * Otherwise, drop the request pending an answer to the upcall. 1050 */ 1051 static int svcauth_gss_handle_init(struct svc_rqst *rqstp, 1052 struct rpc_gss_wire_cred *gc, __be32 *authp) 1053 { 1054 struct kvec *argv = &rqstp->rq_arg.head[0]; 1055 struct kvec *resv = &rqstp->rq_res.head[0]; 1056 struct rsi *rsip, rsikey; 1057 int ret; 1058 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1059 1060 memset(&rsikey, 0, sizeof(rsikey)); 1061 ret = gss_read_verf(gc, argv, authp, 1062 &rsikey.in_handle, &rsikey.in_token); 1063 if (ret) 1064 return ret; 1065 1066 /* Perform upcall, or find upcall result: */ 1067 rsip = rsi_lookup(sn->rsi_cache, &rsikey); 1068 rsi_free(&rsikey); 1069 if (!rsip) 1070 return SVC_CLOSE; 1071 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) 1072 /* No upcall result: */ 1073 return SVC_CLOSE; 1074 1075 ret = SVC_CLOSE; 1076 /* Got an answer to the upcall; use it: */ 1077 if (gss_write_init_verf(sn->rsc_cache, rqstp, 1078 &rsip->out_handle, &rsip->major_status)) 1079 goto out; 1080 if (gss_write_resv(resv, PAGE_SIZE, 1081 &rsip->out_handle, &rsip->out_token, 1082 rsip->major_status, rsip->minor_status)) 1083 goto out; 1084 1085 ret = SVC_COMPLETE; 1086 out: 1087 cache_put(&rsip->h, sn->rsi_cache); 1088 return ret; 1089 } 1090 1091 /* 1092 * Accept an rpcsec packet. 1093 * If context establishment, punt to user space 1094 * If data exchange, verify/decrypt 1095 * If context destruction, handle here 1096 * In the context establishment and destruction case we encode 1097 * response here and return SVC_COMPLETE. 1098 */ 1099 static int 1100 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) 1101 { 1102 struct kvec *argv = &rqstp->rq_arg.head[0]; 1103 struct kvec *resv = &rqstp->rq_res.head[0]; 1104 u32 crlen; 1105 struct gss_svc_data *svcdata = rqstp->rq_auth_data; 1106 struct rpc_gss_wire_cred *gc; 1107 struct rsc *rsci = NULL; 1108 __be32 *rpcstart; 1109 __be32 *reject_stat = resv->iov_base + resv->iov_len; 1110 int ret; 1111 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1112 1113 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n", 1114 argv->iov_len); 1115 1116 *authp = rpc_autherr_badcred; 1117 if (!svcdata) 1118 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); 1119 if (!svcdata) 1120 goto auth_err; 1121 rqstp->rq_auth_data = svcdata; 1122 svcdata->verf_start = NULL; 1123 svcdata->rsci = NULL; 1124 gc = &svcdata->clcred; 1125 1126 /* start of rpc packet is 7 u32's back from here: 1127 * xid direction rpcversion prog vers proc flavour 1128 */ 1129 rpcstart = argv->iov_base; 1130 rpcstart -= 7; 1131 1132 /* credential is: 1133 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle 1134 * at least 5 u32s, and is preceded by length, so that makes 6. 1135 */ 1136 1137 if (argv->iov_len < 5 * 4) 1138 goto auth_err; 1139 crlen = svc_getnl(argv); 1140 if (svc_getnl(argv) != RPC_GSS_VERSION) 1141 goto auth_err; 1142 gc->gc_proc = svc_getnl(argv); 1143 gc->gc_seq = svc_getnl(argv); 1144 gc->gc_svc = svc_getnl(argv); 1145 if (svc_safe_getnetobj(argv, &gc->gc_ctx)) 1146 goto auth_err; 1147 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) 1148 goto auth_err; 1149 1150 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) 1151 goto auth_err; 1152 1153 *authp = rpc_autherr_badverf; 1154 switch (gc->gc_proc) { 1155 case RPC_GSS_PROC_INIT: 1156 case RPC_GSS_PROC_CONTINUE_INIT: 1157 return svcauth_gss_handle_init(rqstp, gc, authp); 1158 case RPC_GSS_PROC_DATA: 1159 case RPC_GSS_PROC_DESTROY: 1160 /* Look up the context, and check the verifier: */ 1161 *authp = rpcsec_gsserr_credproblem; 1162 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); 1163 if (!rsci) 1164 goto auth_err; 1165 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { 1166 case SVC_OK: 1167 break; 1168 case SVC_DENIED: 1169 goto auth_err; 1170 case SVC_DROP: 1171 goto drop; 1172 } 1173 break; 1174 default: 1175 *authp = rpc_autherr_rejectedcred; 1176 goto auth_err; 1177 } 1178 1179 /* now act upon the command: */ 1180 switch (gc->gc_proc) { 1181 case RPC_GSS_PROC_DESTROY: 1182 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1183 goto auth_err; 1184 rsci->h.expiry_time = get_seconds(); 1185 set_bit(CACHE_NEGATIVE, &rsci->h.flags); 1186 if (resv->iov_len + 4 > PAGE_SIZE) 1187 goto drop; 1188 svc_putnl(resv, RPC_SUCCESS); 1189 goto complete; 1190 case RPC_GSS_PROC_DATA: 1191 *authp = rpcsec_gsserr_ctxproblem; 1192 svcdata->verf_start = resv->iov_base + resv->iov_len; 1193 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) 1194 goto auth_err; 1195 rqstp->rq_cred = rsci->cred; 1196 get_group_info(rsci->cred.cr_group_info); 1197 *authp = rpc_autherr_badcred; 1198 switch (gc->gc_svc) { 1199 case RPC_GSS_SVC_NONE: 1200 break; 1201 case RPC_GSS_SVC_INTEGRITY: 1202 /* placeholders for length and seq. number: */ 1203 svc_putnl(resv, 0); 1204 svc_putnl(resv, 0); 1205 if (unwrap_integ_data(rqstp, &rqstp->rq_arg, 1206 gc->gc_seq, rsci->mechctx)) 1207 goto garbage_args; 1208 break; 1209 case RPC_GSS_SVC_PRIVACY: 1210 /* placeholders for length and seq. number: */ 1211 svc_putnl(resv, 0); 1212 svc_putnl(resv, 0); 1213 if (unwrap_priv_data(rqstp, &rqstp->rq_arg, 1214 gc->gc_seq, rsci->mechctx)) 1215 goto garbage_args; 1216 break; 1217 default: 1218 goto auth_err; 1219 } 1220 svcdata->rsci = rsci; 1221 cache_get(&rsci->h); 1222 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( 1223 rsci->mechctx->mech_type, gc->gc_svc); 1224 ret = SVC_OK; 1225 goto out; 1226 } 1227 garbage_args: 1228 ret = SVC_GARBAGE; 1229 goto out; 1230 auth_err: 1231 /* Restore write pointer to its original value: */ 1232 xdr_ressize_check(rqstp, reject_stat); 1233 ret = SVC_DENIED; 1234 goto out; 1235 complete: 1236 ret = SVC_COMPLETE; 1237 goto out; 1238 drop: 1239 ret = SVC_DROP; 1240 out: 1241 if (rsci) 1242 cache_put(&rsci->h, sn->rsc_cache); 1243 return ret; 1244 } 1245 1246 static __be32 * 1247 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) 1248 { 1249 __be32 *p; 1250 u32 verf_len; 1251 1252 p = gsd->verf_start; 1253 gsd->verf_start = NULL; 1254 1255 /* If the reply stat is nonzero, don't wrap: */ 1256 if (*(p-1) != rpc_success) 1257 return NULL; 1258 /* Skip the verifier: */ 1259 p += 1; 1260 verf_len = ntohl(*p++); 1261 p += XDR_QUADLEN(verf_len); 1262 /* move accept_stat to right place: */ 1263 memcpy(p, p + 2, 4); 1264 /* Also don't wrap if the accept stat is nonzero: */ 1265 if (*p != rpc_success) { 1266 resbuf->head[0].iov_len -= 2 * 4; 1267 return NULL; 1268 } 1269 p++; 1270 return p; 1271 } 1272 1273 static inline int 1274 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) 1275 { 1276 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1277 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1278 struct xdr_buf *resbuf = &rqstp->rq_res; 1279 struct xdr_buf integ_buf; 1280 struct xdr_netobj mic; 1281 struct kvec *resv; 1282 __be32 *p; 1283 int integ_offset, integ_len; 1284 int stat = -EINVAL; 1285 1286 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1287 if (p == NULL) 1288 goto out; 1289 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; 1290 integ_len = resbuf->len - integ_offset; 1291 BUG_ON(integ_len % 4); 1292 *p++ = htonl(integ_len); 1293 *p++ = htonl(gc->gc_seq); 1294 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, 1295 integ_len)) 1296 BUG(); 1297 if (resbuf->tail[0].iov_base == NULL) { 1298 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1299 goto out_err; 1300 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1301 + resbuf->head[0].iov_len; 1302 resbuf->tail[0].iov_len = 0; 1303 resv = &resbuf->tail[0]; 1304 } else { 1305 resv = &resbuf->tail[0]; 1306 } 1307 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; 1308 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) 1309 goto out_err; 1310 svc_putnl(resv, mic.len); 1311 memset(mic.data + mic.len, 0, 1312 round_up_to_quad(mic.len) - mic.len); 1313 resv->iov_len += XDR_QUADLEN(mic.len) << 2; 1314 /* not strictly required: */ 1315 resbuf->len += XDR_QUADLEN(mic.len) << 2; 1316 BUG_ON(resv->iov_len > PAGE_SIZE); 1317 out: 1318 stat = 0; 1319 out_err: 1320 return stat; 1321 } 1322 1323 static inline int 1324 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) 1325 { 1326 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1327 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1328 struct xdr_buf *resbuf = &rqstp->rq_res; 1329 struct page **inpages = NULL; 1330 __be32 *p, *len; 1331 int offset; 1332 int pad; 1333 1334 p = svcauth_gss_prepare_to_wrap(resbuf, gsd); 1335 if (p == NULL) 1336 return 0; 1337 len = p++; 1338 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; 1339 *p++ = htonl(gc->gc_seq); 1340 inpages = resbuf->pages; 1341 /* XXX: Would be better to write some xdr helper functions for 1342 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ 1343 1344 /* 1345 * If there is currently tail data, make sure there is 1346 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in 1347 * the page, and move the current tail data such that 1348 * there is RPC_MAX_AUTH_SIZE slack space available in 1349 * both the head and tail. 1350 */ 1351 if (resbuf->tail[0].iov_base) { 1352 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base 1353 + PAGE_SIZE); 1354 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); 1355 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len 1356 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1357 return -ENOMEM; 1358 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, 1359 resbuf->tail[0].iov_base, 1360 resbuf->tail[0].iov_len); 1361 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; 1362 } 1363 /* 1364 * If there is no current tail data, make sure there is 1365 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the 1366 * allotted page, and set up tail information such that there 1367 * is RPC_MAX_AUTH_SIZE slack space available in both the 1368 * head and tail. 1369 */ 1370 if (resbuf->tail[0].iov_base == NULL) { 1371 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) 1372 return -ENOMEM; 1373 resbuf->tail[0].iov_base = resbuf->head[0].iov_base 1374 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; 1375 resbuf->tail[0].iov_len = 0; 1376 } 1377 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) 1378 return -ENOMEM; 1379 *len = htonl(resbuf->len - offset); 1380 pad = 3 - ((resbuf->len - offset - 1)&3); 1381 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); 1382 memset(p, 0, pad); 1383 resbuf->tail[0].iov_len += pad; 1384 resbuf->len += pad; 1385 return 0; 1386 } 1387 1388 static int 1389 svcauth_gss_release(struct svc_rqst *rqstp) 1390 { 1391 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; 1392 struct rpc_gss_wire_cred *gc = &gsd->clcred; 1393 struct xdr_buf *resbuf = &rqstp->rq_res; 1394 int stat = -EINVAL; 1395 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id); 1396 1397 if (gc->gc_proc != RPC_GSS_PROC_DATA) 1398 goto out; 1399 /* Release can be called twice, but we only wrap once. */ 1400 if (gsd->verf_start == NULL) 1401 goto out; 1402 /* normally not set till svc_send, but we need it here: */ 1403 /* XXX: what for? Do we mess it up the moment we call svc_putu32 1404 * or whatever? */ 1405 resbuf->len = total_buf_len(resbuf); 1406 switch (gc->gc_svc) { 1407 case RPC_GSS_SVC_NONE: 1408 break; 1409 case RPC_GSS_SVC_INTEGRITY: 1410 stat = svcauth_gss_wrap_resp_integ(rqstp); 1411 if (stat) 1412 goto out_err; 1413 break; 1414 case RPC_GSS_SVC_PRIVACY: 1415 stat = svcauth_gss_wrap_resp_priv(rqstp); 1416 if (stat) 1417 goto out_err; 1418 break; 1419 /* 1420 * For any other gc_svc value, svcauth_gss_accept() already set 1421 * the auth_error appropriately; just fall through: 1422 */ 1423 } 1424 1425 out: 1426 stat = 0; 1427 out_err: 1428 if (rqstp->rq_client) 1429 auth_domain_put(rqstp->rq_client); 1430 rqstp->rq_client = NULL; 1431 if (rqstp->rq_gssclient) 1432 auth_domain_put(rqstp->rq_gssclient); 1433 rqstp->rq_gssclient = NULL; 1434 if (rqstp->rq_cred.cr_group_info) 1435 put_group_info(rqstp->rq_cred.cr_group_info); 1436 rqstp->rq_cred.cr_group_info = NULL; 1437 if (gsd->rsci) 1438 cache_put(&gsd->rsci->h, sn->rsc_cache); 1439 gsd->rsci = NULL; 1440 1441 return stat; 1442 } 1443 1444 static void 1445 svcauth_gss_domain_release(struct auth_domain *dom) 1446 { 1447 struct gss_domain *gd = container_of(dom, struct gss_domain, h); 1448 1449 kfree(dom->name); 1450 kfree(gd); 1451 } 1452 1453 static struct auth_ops svcauthops_gss = { 1454 .name = "rpcsec_gss", 1455 .owner = THIS_MODULE, 1456 .flavour = RPC_AUTH_GSS, 1457 .accept = svcauth_gss_accept, 1458 .release = svcauth_gss_release, 1459 .domain_release = svcauth_gss_domain_release, 1460 .set_client = svcauth_gss_set_client, 1461 }; 1462 1463 static int rsi_cache_create_net(struct net *net) 1464 { 1465 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1466 struct cache_detail *cd; 1467 int err; 1468 1469 cd = cache_create_net(&rsi_cache_template, net); 1470 if (IS_ERR(cd)) 1471 return PTR_ERR(cd); 1472 err = cache_register_net(cd, net); 1473 if (err) { 1474 cache_destroy_net(cd, net); 1475 return err; 1476 } 1477 sn->rsi_cache = cd; 1478 return 0; 1479 } 1480 1481 static void rsi_cache_destroy_net(struct net *net) 1482 { 1483 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1484 struct cache_detail *cd = sn->rsi_cache; 1485 1486 sn->rsi_cache = NULL; 1487 cache_purge(cd); 1488 cache_unregister_net(cd, net); 1489 cache_destroy_net(cd, net); 1490 } 1491 1492 static int rsc_cache_create_net(struct net *net) 1493 { 1494 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1495 struct cache_detail *cd; 1496 int err; 1497 1498 cd = cache_create_net(&rsc_cache_template, net); 1499 if (IS_ERR(cd)) 1500 return PTR_ERR(cd); 1501 err = cache_register_net(cd, net); 1502 if (err) { 1503 cache_destroy_net(cd, net); 1504 return err; 1505 } 1506 sn->rsc_cache = cd; 1507 return 0; 1508 } 1509 1510 static void rsc_cache_destroy_net(struct net *net) 1511 { 1512 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); 1513 struct cache_detail *cd = sn->rsc_cache; 1514 1515 sn->rsc_cache = NULL; 1516 cache_purge(cd); 1517 cache_unregister_net(cd, net); 1518 cache_destroy_net(cd, net); 1519 } 1520 1521 int 1522 gss_svc_init_net(struct net *net) 1523 { 1524 int rv; 1525 1526 rv = rsc_cache_create_net(net); 1527 if (rv) 1528 return rv; 1529 rv = rsi_cache_create_net(net); 1530 if (rv) 1531 goto out1; 1532 return 0; 1533 out1: 1534 rsc_cache_destroy_net(net); 1535 return rv; 1536 } 1537 1538 void 1539 gss_svc_shutdown_net(struct net *net) 1540 { 1541 rsi_cache_destroy_net(net); 1542 rsc_cache_destroy_net(net); 1543 } 1544 1545 int 1546 gss_svc_init(void) 1547 { 1548 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); 1549 } 1550 1551 void 1552 gss_svc_shutdown(void) 1553 { 1554 svc_auth_unregister(RPC_AUTH_GSS); 1555 } 1556