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sys/rpc/rpcsec_gss/svc_rpcsec_gss.c
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1 /*- 2 * Copyright (c) 2008 Doug Rabson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 /* 27 svc_rpcsec_gss.c 28 29 Copyright (c) 2000 The Regents of the University of Michigan. 30 All rights reserved. 31 32 Copyright (c) 2000 Dug Song <dugsong@UMICH.EDU>. 33 All rights reserved, all wrongs reversed. 34 35 Redistribution and use in source and binary forms, with or without 36 modification, are permitted provided that the following conditions 37 are met: 38 39 1. Redistributions of source code must retain the above copyright 40 notice, this list of conditions and the following disclaimer. 41 2. Redistributions in binary form must reproduce the above copyright 42 notice, this list of conditions and the following disclaimer in the 43 documentation and/or other materials provided with the distribution. 44 3. Neither the name of the University nor the names of its 45 contributors may be used to endorse or promote products derived 46 from this software without specific prior written permission. 47 48 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 49 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 50 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 51 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 53 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 54 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 55 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 56 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 57 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 58 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 59 60 $Id: svc_auth_gss.c,v 1.27 2002/01/15 15:43:00 andros Exp $ 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD: releng/10.2/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c 242090 2012-10-25 19:30:58Z rmacklem $"); 65 66 #include <sys/param.h> 67 #include <sys/systm.h> 68 #include <sys/jail.h> 69 #include <sys/kernel.h> 70 #include <sys/kobj.h> 71 #include <sys/lock.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/mutex.h> 75 #include <sys/proc.h> 76 #include <sys/sx.h> 77 #include <sys/ucred.h> 78 79 #include <rpc/rpc.h> 80 #include <rpc/rpcsec_gss.h> 81 82 #include "rpcsec_gss_int.h" 83 84 static bool_t svc_rpc_gss_wrap(SVCAUTH *, struct mbuf **); 85 static bool_t svc_rpc_gss_unwrap(SVCAUTH *, struct mbuf **); 86 static void svc_rpc_gss_release(SVCAUTH *); 87 static enum auth_stat svc_rpc_gss(struct svc_req *, struct rpc_msg *); 88 static int rpc_gss_svc_getcred(struct svc_req *, struct ucred **, int *); 89 90 static struct svc_auth_ops svc_auth_gss_ops = { 91 svc_rpc_gss_wrap, 92 svc_rpc_gss_unwrap, 93 svc_rpc_gss_release, 94 }; 95 96 struct sx svc_rpc_gss_lock; 97 98 struct svc_rpc_gss_callback { 99 SLIST_ENTRY(svc_rpc_gss_callback) cb_link; 100 rpc_gss_callback_t cb_callback; 101 }; 102 static SLIST_HEAD(svc_rpc_gss_callback_list, svc_rpc_gss_callback) 103 svc_rpc_gss_callbacks = SLIST_HEAD_INITIALIZER(svc_rpc_gss_callbacks); 104 105 struct svc_rpc_gss_svc_name { 106 SLIST_ENTRY(svc_rpc_gss_svc_name) sn_link; 107 char *sn_principal; 108 gss_OID sn_mech; 109 u_int sn_req_time; 110 gss_cred_id_t sn_cred; 111 u_int sn_program; 112 u_int sn_version; 113 }; 114 static SLIST_HEAD(svc_rpc_gss_svc_name_list, svc_rpc_gss_svc_name) 115 svc_rpc_gss_svc_names = SLIST_HEAD_INITIALIZER(svc_rpc_gss_svc_names); 116 117 enum svc_rpc_gss_client_state { 118 CLIENT_NEW, /* still authenticating */ 119 CLIENT_ESTABLISHED, /* context established */ 120 CLIENT_STALE /* garbage to collect */ 121 }; 122 123 #define SVC_RPC_GSS_SEQWINDOW 128 124 #ifndef RPCAUTH_UNIXGIDS 125 #define RPCAUTH_UNIXGIDS 16 126 #endif 127 128 struct svc_rpc_gss_clientid { 129 unsigned long ci_hostid; 130 uint32_t ci_boottime; 131 uint32_t ci_id; 132 }; 133 134 struct svc_rpc_gss_client { 135 TAILQ_ENTRY(svc_rpc_gss_client) cl_link; 136 TAILQ_ENTRY(svc_rpc_gss_client) cl_alllink; 137 volatile u_int cl_refs; 138 struct sx cl_lock; 139 struct svc_rpc_gss_clientid cl_id; 140 time_t cl_expiration; /* when to gc */ 141 enum svc_rpc_gss_client_state cl_state; /* client state */ 142 bool_t cl_locked; /* fixed service+qop */ 143 gss_ctx_id_t cl_ctx; /* context id */ 144 gss_cred_id_t cl_creds; /* delegated creds */ 145 gss_name_t cl_cname; /* client name */ 146 struct svc_rpc_gss_svc_name *cl_sname; /* server name used */ 147 rpc_gss_rawcred_t cl_rawcred; /* raw credentials */ 148 rpc_gss_ucred_t cl_ucred; /* unix-style credentials */ 149 struct ucred *cl_cred; /* kernel-style credentials */ 150 int cl_rpcflavor; /* RPC pseudo sec flavor */ 151 bool_t cl_done_callback; /* TRUE after call */ 152 void *cl_cookie; /* user cookie from callback */ 153 gid_t cl_gid_storage[RPCAUTH_UNIXGIDS]; 154 gss_OID cl_mech; /* mechanism */ 155 gss_qop_t cl_qop; /* quality of protection */ 156 uint32_t cl_seqlast; /* sequence window origin */ 157 uint32_t cl_seqmask[SVC_RPC_GSS_SEQWINDOW/32]; /* bitmask of seqnums */ 158 }; 159 TAILQ_HEAD(svc_rpc_gss_client_list, svc_rpc_gss_client); 160 161 /* 162 * This structure holds enough information to unwrap arguments or wrap 163 * results for a given request. We use the rq_clntcred area for this 164 * (which is a per-request buffer). 165 */ 166 struct svc_rpc_gss_cookedcred { 167 struct svc_rpc_gss_client *cc_client; 168 rpc_gss_service_t cc_service; 169 uint32_t cc_seq; 170 }; 171 172 #define CLIENT_HASH_SIZE 256 173 #define CLIENT_MAX 128 174 struct svc_rpc_gss_client_list svc_rpc_gss_client_hash[CLIENT_HASH_SIZE]; 175 struct svc_rpc_gss_client_list svc_rpc_gss_clients; 176 static size_t svc_rpc_gss_client_count; 177 static uint32_t svc_rpc_gss_next_clientid = 1; 178 179 static void 180 svc_rpc_gss_init(void *arg) 181 { 182 int i; 183 184 for (i = 0; i < CLIENT_HASH_SIZE; i++) 185 TAILQ_INIT(&svc_rpc_gss_client_hash[i]); 186 TAILQ_INIT(&svc_rpc_gss_clients); 187 svc_auth_reg(RPCSEC_GSS, svc_rpc_gss, rpc_gss_svc_getcred); 188 sx_init(&svc_rpc_gss_lock, "gsslock"); 189 } 190 SYSINIT(svc_rpc_gss_init, SI_SUB_KMEM, SI_ORDER_ANY, svc_rpc_gss_init, NULL); 191 192 bool_t 193 rpc_gss_set_callback(rpc_gss_callback_t *cb) 194 { 195 struct svc_rpc_gss_callback *scb; 196 197 scb = mem_alloc(sizeof(struct svc_rpc_gss_callback)); 198 if (!scb) { 199 _rpc_gss_set_error(RPC_GSS_ER_SYSTEMERROR, ENOMEM); 200 return (FALSE); 201 } 202 scb->cb_callback = *cb; 203 sx_xlock(&svc_rpc_gss_lock); 204 SLIST_INSERT_HEAD(&svc_rpc_gss_callbacks, scb, cb_link); 205 sx_xunlock(&svc_rpc_gss_lock); 206 207 return (TRUE); 208 } 209 210 void 211 rpc_gss_clear_callback(rpc_gss_callback_t *cb) 212 { 213 struct svc_rpc_gss_callback *scb; 214 215 sx_xlock(&svc_rpc_gss_lock); 216 SLIST_FOREACH(scb, &svc_rpc_gss_callbacks, cb_link) { 217 if (scb->cb_callback.program == cb->program 218 && scb->cb_callback.version == cb->version 219 && scb->cb_callback.callback == cb->callback) { 220 SLIST_REMOVE(&svc_rpc_gss_callbacks, scb, 221 svc_rpc_gss_callback, cb_link); 222 sx_xunlock(&svc_rpc_gss_lock); 223 mem_free(scb, sizeof(*scb)); 224 return; 225 } 226 } 227 sx_xunlock(&svc_rpc_gss_lock); 228 } 229 230 static bool_t 231 rpc_gss_acquire_svc_cred(struct svc_rpc_gss_svc_name *sname) 232 { 233 OM_uint32 maj_stat, min_stat; 234 gss_buffer_desc namebuf; 235 gss_name_t name; 236 gss_OID_set_desc oid_set; 237 238 oid_set.count = 1; 239 oid_set.elements = sname->sn_mech; 240 241 namebuf.value = (void *) sname->sn_principal; 242 namebuf.length = strlen(sname->sn_principal); 243 244 maj_stat = gss_import_name(&min_stat, &namebuf, 245 GSS_C_NT_HOSTBASED_SERVICE, &name); 246 if (maj_stat != GSS_S_COMPLETE) 247 return (FALSE); 248 249 if (sname->sn_cred != GSS_C_NO_CREDENTIAL) 250 gss_release_cred(&min_stat, &sname->sn_cred); 251 252 maj_stat = gss_acquire_cred(&min_stat, name, 253 sname->sn_req_time, &oid_set, GSS_C_ACCEPT, &sname->sn_cred, 254 NULL, NULL); 255 if (maj_stat != GSS_S_COMPLETE) { 256 gss_release_name(&min_stat, &name); 257 return (FALSE); 258 } 259 gss_release_name(&min_stat, &name); 260 261 return (TRUE); 262 } 263 264 bool_t 265 rpc_gss_set_svc_name(const char *principal, const char *mechanism, 266 u_int req_time, u_int program, u_int version) 267 { 268 struct svc_rpc_gss_svc_name *sname; 269 gss_OID mech_oid; 270 271 if (!rpc_gss_mech_to_oid(mechanism, &mech_oid)) 272 return (FALSE); 273 274 sname = mem_alloc(sizeof(*sname)); 275 if (!sname) 276 return (FALSE); 277 sname->sn_principal = strdup(principal, M_RPC); 278 sname->sn_mech = mech_oid; 279 sname->sn_req_time = req_time; 280 sname->sn_cred = GSS_C_NO_CREDENTIAL; 281 sname->sn_program = program; 282 sname->sn_version = version; 283 284 if (!rpc_gss_acquire_svc_cred(sname)) { 285 free(sname->sn_principal, M_RPC); 286 mem_free(sname, sizeof(*sname)); 287 return (FALSE); 288 } 289 290 sx_xlock(&svc_rpc_gss_lock); 291 SLIST_INSERT_HEAD(&svc_rpc_gss_svc_names, sname, sn_link); 292 sx_xunlock(&svc_rpc_gss_lock); 293 294 return (TRUE); 295 } 296 297 void 298 rpc_gss_clear_svc_name(u_int program, u_int version) 299 { 300 OM_uint32 min_stat; 301 struct svc_rpc_gss_svc_name *sname; 302 303 sx_xlock(&svc_rpc_gss_lock); 304 SLIST_FOREACH(sname, &svc_rpc_gss_svc_names, sn_link) { 305 if (sname->sn_program == program 306 && sname->sn_version == version) { 307 SLIST_REMOVE(&svc_rpc_gss_svc_names, sname, 308 svc_rpc_gss_svc_name, sn_link); 309 sx_xunlock(&svc_rpc_gss_lock); 310 gss_release_cred(&min_stat, &sname->sn_cred); 311 free(sname->sn_principal, M_RPC); 312 mem_free(sname, sizeof(*sname)); 313 return; 314 } 315 } 316 sx_xunlock(&svc_rpc_gss_lock); 317 } 318 319 bool_t 320 rpc_gss_get_principal_name(rpc_gss_principal_t *principal, 321 const char *mech, const char *name, const char *node, const char *domain) 322 { 323 OM_uint32 maj_stat, min_stat; 324 gss_OID mech_oid; 325 size_t namelen; 326 gss_buffer_desc buf; 327 gss_name_t gss_name, gss_mech_name; 328 rpc_gss_principal_t result; 329 330 if (!rpc_gss_mech_to_oid(mech, &mech_oid)) 331 return (FALSE); 332 333 /* 334 * Construct a gss_buffer containing the full name formatted 335 * as "name/node@domain" where node and domain are optional. 336 */ 337 namelen = strlen(name); 338 if (node) { 339 namelen += strlen(node) + 1; 340 } 341 if (domain) { 342 namelen += strlen(domain) + 1; 343 } 344 345 buf.value = mem_alloc(namelen); 346 buf.length = namelen; 347 strcpy((char *) buf.value, name); 348 if (node) { 349 strcat((char *) buf.value, "/"); 350 strcat((char *) buf.value, node); 351 } 352 if (domain) { 353 strcat((char *) buf.value, "@"); 354 strcat((char *) buf.value, domain); 355 } 356 357 /* 358 * Convert that to a gss_name_t and then convert that to a 359 * mechanism name in the selected mechanism. 360 */ 361 maj_stat = gss_import_name(&min_stat, &buf, 362 GSS_C_NT_USER_NAME, &gss_name); 363 mem_free(buf.value, buf.length); 364 if (maj_stat != GSS_S_COMPLETE) { 365 rpc_gss_log_status("gss_import_name", mech_oid, maj_stat, min_stat); 366 return (FALSE); 367 } 368 maj_stat = gss_canonicalize_name(&min_stat, gss_name, mech_oid, 369 &gss_mech_name); 370 if (maj_stat != GSS_S_COMPLETE) { 371 rpc_gss_log_status("gss_canonicalize_name", mech_oid, maj_stat, 372 min_stat); 373 gss_release_name(&min_stat, &gss_name); 374 return (FALSE); 375 } 376 gss_release_name(&min_stat, &gss_name); 377 378 /* 379 * Export the mechanism name and use that to construct the 380 * rpc_gss_principal_t result. 381 */ 382 maj_stat = gss_export_name(&min_stat, gss_mech_name, &buf); 383 if (maj_stat != GSS_S_COMPLETE) { 384 rpc_gss_log_status("gss_export_name", mech_oid, maj_stat, min_stat); 385 gss_release_name(&min_stat, &gss_mech_name); 386 return (FALSE); 387 } 388 gss_release_name(&min_stat, &gss_mech_name); 389 390 result = mem_alloc(sizeof(int) + buf.length); 391 if (!result) { 392 gss_release_buffer(&min_stat, &buf); 393 return (FALSE); 394 } 395 result->len = buf.length; 396 memcpy(result->name, buf.value, buf.length); 397 gss_release_buffer(&min_stat, &buf); 398 399 *principal = result; 400 return (TRUE); 401 } 402 403 bool_t 404 rpc_gss_getcred(struct svc_req *req, rpc_gss_rawcred_t **rcred, 405 rpc_gss_ucred_t **ucred, void **cookie) 406 { 407 struct svc_rpc_gss_cookedcred *cc; 408 struct svc_rpc_gss_client *client; 409 410 if (req->rq_cred.oa_flavor != RPCSEC_GSS) 411 return (FALSE); 412 413 cc = req->rq_clntcred; 414 client = cc->cc_client; 415 if (rcred) 416 *rcred = &client->cl_rawcred; 417 if (ucred) 418 *ucred = &client->cl_ucred; 419 if (cookie) 420 *cookie = client->cl_cookie; 421 return (TRUE); 422 } 423 424 /* 425 * This simpler interface is used by svc_getcred to copy the cred data 426 * into a kernel cred structure. 427 */ 428 static int 429 rpc_gss_svc_getcred(struct svc_req *req, struct ucred **crp, int *flavorp) 430 { 431 struct ucred *cr; 432 struct svc_rpc_gss_cookedcred *cc; 433 struct svc_rpc_gss_client *client; 434 rpc_gss_ucred_t *uc; 435 436 if (req->rq_cred.oa_flavor != RPCSEC_GSS) 437 return (FALSE); 438 439 cc = req->rq_clntcred; 440 client = cc->cc_client; 441 442 if (flavorp) 443 *flavorp = client->cl_rpcflavor; 444 445 if (client->cl_cred) { 446 *crp = crhold(client->cl_cred); 447 return (TRUE); 448 } 449 450 uc = &client->cl_ucred; 451 cr = client->cl_cred = crget(); 452 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = uc->uid; 453 cr->cr_rgid = cr->cr_svgid = uc->gid; 454 crsetgroups(cr, uc->gidlen, uc->gidlist); 455 cr->cr_prison = &prison0; 456 prison_hold(cr->cr_prison); 457 *crp = crhold(cr); 458 459 return (TRUE); 460 } 461 462 int 463 rpc_gss_svc_max_data_length(struct svc_req *req, int max_tp_unit_len) 464 { 465 struct svc_rpc_gss_cookedcred *cc = req->rq_clntcred; 466 struct svc_rpc_gss_client *client = cc->cc_client; 467 int want_conf; 468 OM_uint32 max; 469 OM_uint32 maj_stat, min_stat; 470 int result; 471 472 switch (client->cl_rawcred.service) { 473 case rpc_gss_svc_none: 474 return (max_tp_unit_len); 475 break; 476 477 case rpc_gss_svc_default: 478 case rpc_gss_svc_integrity: 479 want_conf = FALSE; 480 break; 481 482 case rpc_gss_svc_privacy: 483 want_conf = TRUE; 484 break; 485 486 default: 487 return (0); 488 } 489 490 maj_stat = gss_wrap_size_limit(&min_stat, client->cl_ctx, want_conf, 491 client->cl_qop, max_tp_unit_len, &max); 492 493 if (maj_stat == GSS_S_COMPLETE) { 494 result = (int) max; 495 if (result < 0) 496 result = 0; 497 return (result); 498 } else { 499 rpc_gss_log_status("gss_wrap_size_limit", client->cl_mech, 500 maj_stat, min_stat); 501 return (0); 502 } 503 } 504 505 static struct svc_rpc_gss_client * 506 svc_rpc_gss_find_client(struct svc_rpc_gss_clientid *id) 507 { 508 struct svc_rpc_gss_client *client; 509 struct svc_rpc_gss_client_list *list; 510 unsigned long hostid; 511 512 rpc_gss_log_debug("in svc_rpc_gss_find_client(%d)", id->ci_id); 513 514 getcredhostid(curthread->td_ucred, &hostid); 515 if (id->ci_hostid != hostid || id->ci_boottime != boottime.tv_sec) 516 return (NULL); 517 518 list = &svc_rpc_gss_client_hash[id->ci_id % CLIENT_HASH_SIZE]; 519 sx_xlock(&svc_rpc_gss_lock); 520 TAILQ_FOREACH(client, list, cl_link) { 521 if (client->cl_id.ci_id == id->ci_id) { 522 /* 523 * Move this client to the front of the LRU 524 * list. 525 */ 526 TAILQ_REMOVE(&svc_rpc_gss_clients, client, cl_alllink); 527 TAILQ_INSERT_HEAD(&svc_rpc_gss_clients, client, 528 cl_alllink); 529 refcount_acquire(&client->cl_refs); 530 break; 531 } 532 } 533 sx_xunlock(&svc_rpc_gss_lock); 534 535 return (client); 536 } 537 538 static struct svc_rpc_gss_client * 539 svc_rpc_gss_create_client(void) 540 { 541 struct svc_rpc_gss_client *client; 542 struct svc_rpc_gss_client_list *list; 543 unsigned long hostid; 544 545 rpc_gss_log_debug("in svc_rpc_gss_create_client()"); 546 547 client = mem_alloc(sizeof(struct svc_rpc_gss_client)); 548 memset(client, 0, sizeof(struct svc_rpc_gss_client)); 549 refcount_init(&client->cl_refs, 1); 550 sx_init(&client->cl_lock, "GSS-client"); 551 getcredhostid(curthread->td_ucred, &hostid); 552 client->cl_id.ci_hostid = hostid; 553 client->cl_id.ci_boottime = boottime.tv_sec; 554 client->cl_id.ci_id = svc_rpc_gss_next_clientid++; 555 list = &svc_rpc_gss_client_hash[client->cl_id.ci_id % CLIENT_HASH_SIZE]; 556 sx_xlock(&svc_rpc_gss_lock); 557 TAILQ_INSERT_HEAD(list, client, cl_link); 558 TAILQ_INSERT_HEAD(&svc_rpc_gss_clients, client, cl_alllink); 559 svc_rpc_gss_client_count++; 560 sx_xunlock(&svc_rpc_gss_lock); 561 562 /* 563 * Start the client off with a short expiration time. We will 564 * try to get a saner value from the client creds later. 565 */ 566 client->cl_state = CLIENT_NEW; 567 client->cl_locked = FALSE; 568 client->cl_expiration = time_uptime + 5*60; 569 570 return (client); 571 } 572 573 static void 574 svc_rpc_gss_destroy_client(struct svc_rpc_gss_client *client) 575 { 576 OM_uint32 min_stat; 577 578 rpc_gss_log_debug("in svc_rpc_gss_destroy_client()"); 579 580 if (client->cl_ctx) 581 gss_delete_sec_context(&min_stat, 582 &client->cl_ctx, GSS_C_NO_BUFFER); 583 584 if (client->cl_cname) 585 gss_release_name(&min_stat, &client->cl_cname); 586 587 if (client->cl_rawcred.client_principal) 588 mem_free(client->cl_rawcred.client_principal, 589 sizeof(*client->cl_rawcred.client_principal) 590 + client->cl_rawcred.client_principal->len); 591 592 if (client->cl_cred) 593 crfree(client->cl_cred); 594 595 sx_destroy(&client->cl_lock); 596 mem_free(client, sizeof(*client)); 597 } 598 599 /* 600 * Drop a reference to a client and free it if that was the last reference. 601 */ 602 static void 603 svc_rpc_gss_release_client(struct svc_rpc_gss_client *client) 604 { 605 606 if (!refcount_release(&client->cl_refs)) 607 return; 608 svc_rpc_gss_destroy_client(client); 609 } 610 611 /* 612 * Remove a client from our global lists. 613 * Must be called with svc_rpc_gss_lock held. 614 */ 615 static void 616 svc_rpc_gss_forget_client_locked(struct svc_rpc_gss_client *client) 617 { 618 struct svc_rpc_gss_client_list *list; 619 620 sx_assert(&svc_rpc_gss_lock, SX_XLOCKED); 621 list = &svc_rpc_gss_client_hash[client->cl_id.ci_id % CLIENT_HASH_SIZE]; 622 TAILQ_REMOVE(list, client, cl_link); 623 TAILQ_REMOVE(&svc_rpc_gss_clients, client, cl_alllink); 624 svc_rpc_gss_client_count--; 625 } 626 627 /* 628 * Remove a client from our global lists and free it if we can. 629 */ 630 static void 631 svc_rpc_gss_forget_client(struct svc_rpc_gss_client *client) 632 { 633 struct svc_rpc_gss_client_list *list; 634 struct svc_rpc_gss_client *tclient; 635 636 list = &svc_rpc_gss_client_hash[client->cl_id.ci_id % CLIENT_HASH_SIZE]; 637 sx_xlock(&svc_rpc_gss_lock); 638 TAILQ_FOREACH(tclient, list, cl_link) { 639 /* 640 * Make sure this client has not already been removed 641 * from the lists by svc_rpc_gss_forget_client() or 642 * svc_rpc_gss_forget_client_locked(). 643 */ 644 if (client == tclient) { 645 svc_rpc_gss_forget_client_locked(client); 646 sx_xunlock(&svc_rpc_gss_lock); 647 svc_rpc_gss_release_client(client); 648 return; 649 } 650 } 651 sx_xunlock(&svc_rpc_gss_lock); 652 } 653 654 static void 655 svc_rpc_gss_timeout_clients(void) 656 { 657 struct svc_rpc_gss_client *client; 658 time_t now = time_uptime; 659 660 rpc_gss_log_debug("in svc_rpc_gss_timeout_clients()"); 661 662 /* 663 * First enforce the max client limit. We keep 664 * svc_rpc_gss_clients in LRU order. 665 */ 666 sx_xlock(&svc_rpc_gss_lock); 667 client = TAILQ_LAST(&svc_rpc_gss_clients, svc_rpc_gss_client_list); 668 while (svc_rpc_gss_client_count > CLIENT_MAX && client != NULL) { 669 svc_rpc_gss_forget_client_locked(client); 670 sx_xunlock(&svc_rpc_gss_lock); 671 svc_rpc_gss_release_client(client); 672 sx_xlock(&svc_rpc_gss_lock); 673 client = TAILQ_LAST(&svc_rpc_gss_clients, 674 svc_rpc_gss_client_list); 675 } 676 again: 677 TAILQ_FOREACH(client, &svc_rpc_gss_clients, cl_alllink) { 678 if (client->cl_state == CLIENT_STALE 679 || now > client->cl_expiration) { 680 svc_rpc_gss_forget_client_locked(client); 681 sx_xunlock(&svc_rpc_gss_lock); 682 rpc_gss_log_debug("expiring client %p", client); 683 svc_rpc_gss_release_client(client); 684 sx_xlock(&svc_rpc_gss_lock); 685 goto again; 686 } 687 } 688 sx_xunlock(&svc_rpc_gss_lock); 689 } 690 691 #ifdef DEBUG 692 /* 693 * OID<->string routines. These are uuuuugly. 694 */ 695 static OM_uint32 696 gss_oid_to_str(OM_uint32 *minor_status, gss_OID oid, gss_buffer_t oid_str) 697 { 698 char numstr[128]; 699 unsigned long number; 700 int numshift; 701 size_t string_length; 702 size_t i; 703 unsigned char *cp; 704 char *bp; 705 706 /* Decoded according to krb5/gssapi_krb5.c */ 707 708 /* First determine the size of the string */ 709 string_length = 0; 710 number = 0; 711 numshift = 0; 712 cp = (unsigned char *) oid->elements; 713 number = (unsigned long) cp[0]; 714 sprintf(numstr, "%ld ", number/40); 715 string_length += strlen(numstr); 716 sprintf(numstr, "%ld ", number%40); 717 string_length += strlen(numstr); 718 for (i=1; i<oid->length; i++) { 719 if ( (size_t) (numshift+7) < (sizeof(unsigned long)*8)) { 720 number = (number << 7) | (cp[i] & 0x7f); 721 numshift += 7; 722 } 723 else { 724 *minor_status = 0; 725 return(GSS_S_FAILURE); 726 } 727 if ((cp[i] & 0x80) == 0) { 728 sprintf(numstr, "%ld ", number); 729 string_length += strlen(numstr); 730 number = 0; 731 numshift = 0; 732 } 733 } 734 /* 735 * If we get here, we've calculated the length of "n n n ... n ". Add 4 736 * here for "{ " and "}\0". 737 */ 738 string_length += 4; 739 if ((bp = (char *) mem_alloc(string_length))) { 740 strcpy(bp, "{ "); 741 number = (unsigned long) cp[0]; 742 sprintf(numstr, "%ld ", number/40); 743 strcat(bp, numstr); 744 sprintf(numstr, "%ld ", number%40); 745 strcat(bp, numstr); 746 number = 0; 747 cp = (unsigned char *) oid->elements; 748 for (i=1; i<oid->length; i++) { 749 number = (number << 7) | (cp[i] & 0x7f); 750 if ((cp[i] & 0x80) == 0) { 751 sprintf(numstr, "%ld ", number); 752 strcat(bp, numstr); 753 number = 0; 754 } 755 } 756 strcat(bp, "}"); 757 oid_str->length = strlen(bp)+1; 758 oid_str->value = (void *) bp; 759 *minor_status = 0; 760 return(GSS_S_COMPLETE); 761 } 762 *minor_status = 0; 763 return(GSS_S_FAILURE); 764 } 765 #endif 766 767 static void 768 svc_rpc_gss_build_ucred(struct svc_rpc_gss_client *client, 769 const gss_name_t name) 770 { 771 OM_uint32 maj_stat, min_stat; 772 rpc_gss_ucred_t *uc = &client->cl_ucred; 773 int numgroups; 774 775 uc->uid = 65534; 776 uc->gid = 65534; 777 uc->gidlist = client->cl_gid_storage; 778 779 numgroups = RPCAUTH_UNIXGIDS; 780 maj_stat = gss_pname_to_unix_cred(&min_stat, name, client->cl_mech, 781 &uc->uid, &uc->gid, &numgroups, &uc->gidlist[0]); 782 if (GSS_ERROR(maj_stat)) 783 uc->gidlen = 0; 784 else 785 uc->gidlen = numgroups; 786 } 787 788 static void 789 svc_rpc_gss_set_flavor(struct svc_rpc_gss_client *client) 790 { 791 static gss_OID_desc krb5_mech_oid = 792 {9, (void *) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" }; 793 794 /* 795 * Attempt to translate mech type and service into a 796 * 'pseudo flavor'. Hardwire in krb5 support for now. 797 */ 798 if (kgss_oid_equal(client->cl_mech, &krb5_mech_oid)) { 799 switch (client->cl_rawcred.service) { 800 case rpc_gss_svc_default: 801 case rpc_gss_svc_none: 802 client->cl_rpcflavor = RPCSEC_GSS_KRB5; 803 break; 804 case rpc_gss_svc_integrity: 805 client->cl_rpcflavor = RPCSEC_GSS_KRB5I; 806 break; 807 case rpc_gss_svc_privacy: 808 client->cl_rpcflavor = RPCSEC_GSS_KRB5P; 809 break; 810 } 811 } else { 812 client->cl_rpcflavor = RPCSEC_GSS; 813 } 814 } 815 816 static bool_t 817 svc_rpc_gss_accept_sec_context(struct svc_rpc_gss_client *client, 818 struct svc_req *rqst, 819 struct rpc_gss_init_res *gr, 820 struct rpc_gss_cred *gc) 821 { 822 gss_buffer_desc recv_tok; 823 gss_OID mech; 824 OM_uint32 maj_stat = 0, min_stat = 0, ret_flags; 825 OM_uint32 cred_lifetime; 826 struct svc_rpc_gss_svc_name *sname; 827 828 rpc_gss_log_debug("in svc_rpc_gss_accept_context()"); 829 830 /* Deserialize arguments. */ 831 memset(&recv_tok, 0, sizeof(recv_tok)); 832 833 if (!svc_getargs(rqst, 834 (xdrproc_t) xdr_gss_buffer_desc, 835 (caddr_t) &recv_tok)) { 836 client->cl_state = CLIENT_STALE; 837 return (FALSE); 838 } 839 840 /* 841 * First time round, try all the server names we have until 842 * one matches. Afterwards, stick with that one. 843 */ 844 sx_xlock(&svc_rpc_gss_lock); 845 if (!client->cl_sname) { 846 SLIST_FOREACH(sname, &svc_rpc_gss_svc_names, sn_link) { 847 if (sname->sn_program == rqst->rq_prog 848 && sname->sn_version == rqst->rq_vers) { 849 retry: 850 gr->gr_major = gss_accept_sec_context( 851 &gr->gr_minor, 852 &client->cl_ctx, 853 sname->sn_cred, 854 &recv_tok, 855 GSS_C_NO_CHANNEL_BINDINGS, 856 &client->cl_cname, 857 &mech, 858 &gr->gr_token, 859 &ret_flags, 860 &cred_lifetime, 861 &client->cl_creds); 862 if (gr->gr_major == 863 GSS_S_CREDENTIALS_EXPIRED) { 864 /* 865 * Either our creds really did 866 * expire or gssd was 867 * restarted. 868 */ 869 if (rpc_gss_acquire_svc_cred(sname)) 870 goto retry; 871 } 872 client->cl_sname = sname; 873 break; 874 } 875 } 876 if (!sname) { 877 xdr_free((xdrproc_t) xdr_gss_buffer_desc, 878 (char *) &recv_tok); 879 sx_xunlock(&svc_rpc_gss_lock); 880 return (FALSE); 881 } 882 } else { 883 gr->gr_major = gss_accept_sec_context( 884 &gr->gr_minor, 885 &client->cl_ctx, 886 client->cl_sname->sn_cred, 887 &recv_tok, 888 GSS_C_NO_CHANNEL_BINDINGS, 889 &client->cl_cname, 890 &mech, 891 &gr->gr_token, 892 &ret_flags, 893 &cred_lifetime, 894 NULL); 895 } 896 sx_xunlock(&svc_rpc_gss_lock); 897 898 xdr_free((xdrproc_t) xdr_gss_buffer_desc, (char *) &recv_tok); 899 900 /* 901 * If we get an error from gss_accept_sec_context, send the 902 * reply anyway so that the client gets a chance to see what 903 * is wrong. 904 */ 905 if (gr->gr_major != GSS_S_COMPLETE && 906 gr->gr_major != GSS_S_CONTINUE_NEEDED) { 907 rpc_gss_log_status("accept_sec_context", client->cl_mech, 908 gr->gr_major, gr->gr_minor); 909 client->cl_state = CLIENT_STALE; 910 return (TRUE); 911 } 912 913 gr->gr_handle.value = &client->cl_id; 914 gr->gr_handle.length = sizeof(client->cl_id); 915 gr->gr_win = SVC_RPC_GSS_SEQWINDOW; 916 917 /* Save client info. */ 918 client->cl_mech = mech; 919 client->cl_qop = GSS_C_QOP_DEFAULT; 920 client->cl_done_callback = FALSE; 921 922 if (gr->gr_major == GSS_S_COMPLETE) { 923 gss_buffer_desc export_name; 924 925 /* 926 * Change client expiration time to be near when the 927 * client creds expire (or 24 hours if we can't figure 928 * that out). 929 */ 930 if (cred_lifetime == GSS_C_INDEFINITE) 931 cred_lifetime = time_uptime + 24*60*60; 932 933 client->cl_expiration = time_uptime + cred_lifetime; 934 935 /* 936 * Fill in cred details in the rawcred structure. 937 */ 938 client->cl_rawcred.version = RPCSEC_GSS_VERSION; 939 rpc_gss_oid_to_mech(mech, &client->cl_rawcred.mechanism); 940 maj_stat = gss_export_name(&min_stat, client->cl_cname, 941 &export_name); 942 if (maj_stat != GSS_S_COMPLETE) { 943 rpc_gss_log_status("gss_export_name", client->cl_mech, 944 maj_stat, min_stat); 945 return (FALSE); 946 } 947 client->cl_rawcred.client_principal = 948 mem_alloc(sizeof(*client->cl_rawcred.client_principal) 949 + export_name.length); 950 client->cl_rawcred.client_principal->len = export_name.length; 951 memcpy(client->cl_rawcred.client_principal->name, 952 export_name.value, export_name.length); 953 gss_release_buffer(&min_stat, &export_name); 954 client->cl_rawcred.svc_principal = 955 client->cl_sname->sn_principal; 956 client->cl_rawcred.service = gc->gc_svc; 957 958 /* 959 * Use gss_pname_to_uid to map to unix creds. For 960 * kerberos5, this uses krb5_aname_to_localname. 961 */ 962 svc_rpc_gss_build_ucred(client, client->cl_cname); 963 svc_rpc_gss_set_flavor(client); 964 gss_release_name(&min_stat, &client->cl_cname); 965 966 #ifdef DEBUG 967 { 968 gss_buffer_desc mechname; 969 970 gss_oid_to_str(&min_stat, mech, &mechname); 971 972 rpc_gss_log_debug("accepted context for %s with " 973 "<mech %.*s, qop %d, svc %d>", 974 client->cl_rawcred.client_principal->name, 975 mechname.length, (char *)mechname.value, 976 client->cl_qop, client->cl_rawcred.service); 977 978 gss_release_buffer(&min_stat, &mechname); 979 } 980 #endif /* DEBUG */ 981 } 982 return (TRUE); 983 } 984 985 static bool_t 986 svc_rpc_gss_validate(struct svc_rpc_gss_client *client, struct rpc_msg *msg, 987 gss_qop_t *qop, rpc_gss_proc_t gcproc) 988 { 989 struct opaque_auth *oa; 990 gss_buffer_desc rpcbuf, checksum; 991 OM_uint32 maj_stat, min_stat; 992 gss_qop_t qop_state; 993 int32_t rpchdr[128 / sizeof(int32_t)]; 994 int32_t *buf; 995 996 rpc_gss_log_debug("in svc_rpc_gss_validate()"); 997 998 memset(rpchdr, 0, sizeof(rpchdr)); 999 1000 /* Reconstruct RPC header for signing (from xdr_callmsg). */ 1001 buf = rpchdr; 1002 IXDR_PUT_LONG(buf, msg->rm_xid); 1003 IXDR_PUT_ENUM(buf, msg->rm_direction); 1004 IXDR_PUT_LONG(buf, msg->rm_call.cb_rpcvers); 1005 IXDR_PUT_LONG(buf, msg->rm_call.cb_prog); 1006 IXDR_PUT_LONG(buf, msg->rm_call.cb_vers); 1007 IXDR_PUT_LONG(buf, msg->rm_call.cb_proc); 1008 oa = &msg->rm_call.cb_cred; 1009 IXDR_PUT_ENUM(buf, oa->oa_flavor); 1010 IXDR_PUT_LONG(buf, oa->oa_length); 1011 if (oa->oa_length) { 1012 memcpy((caddr_t)buf, oa->oa_base, oa->oa_length); 1013 buf += RNDUP(oa->oa_length) / sizeof(int32_t); 1014 } 1015 rpcbuf.value = rpchdr; 1016 rpcbuf.length = (u_char *)buf - (u_char *)rpchdr; 1017 1018 checksum.value = msg->rm_call.cb_verf.oa_base; 1019 checksum.length = msg->rm_call.cb_verf.oa_length; 1020 1021 maj_stat = gss_verify_mic(&min_stat, client->cl_ctx, &rpcbuf, &checksum, 1022 &qop_state); 1023 1024 if (maj_stat != GSS_S_COMPLETE) { 1025 rpc_gss_log_status("gss_verify_mic", client->cl_mech, 1026 maj_stat, min_stat); 1027 /* 1028 * A bug in some versions of the Linux client generates a 1029 * Destroy operation with a bogus encrypted checksum. Deleting 1030 * the credential handle for that case causes the mount to fail. 1031 * Since the checksum is bogus (gss_verify_mic() failed), it 1032 * doesn't make sense to destroy the handle and not doing so 1033 * fixes the Linux mount. 1034 */ 1035 if (gcproc != RPCSEC_GSS_DESTROY) 1036 client->cl_state = CLIENT_STALE; 1037 return (FALSE); 1038 } 1039 1040 *qop = qop_state; 1041 return (TRUE); 1042 } 1043 1044 static bool_t 1045 svc_rpc_gss_nextverf(struct svc_rpc_gss_client *client, 1046 struct svc_req *rqst, u_int seq) 1047 { 1048 gss_buffer_desc signbuf; 1049 gss_buffer_desc mic; 1050 OM_uint32 maj_stat, min_stat; 1051 uint32_t nseq; 1052 1053 rpc_gss_log_debug("in svc_rpc_gss_nextverf()"); 1054 1055 nseq = htonl(seq); 1056 signbuf.value = &nseq; 1057 signbuf.length = sizeof(nseq); 1058 1059 maj_stat = gss_get_mic(&min_stat, client->cl_ctx, client->cl_qop, 1060 &signbuf, &mic); 1061 1062 if (maj_stat != GSS_S_COMPLETE) { 1063 rpc_gss_log_status("gss_get_mic", client->cl_mech, maj_stat, min_stat); 1064 client->cl_state = CLIENT_STALE; 1065 return (FALSE); 1066 } 1067 1068 KASSERT(mic.length <= MAX_AUTH_BYTES, 1069 ("MIC too large for RPCSEC_GSS")); 1070 1071 rqst->rq_verf.oa_flavor = RPCSEC_GSS; 1072 rqst->rq_verf.oa_length = mic.length; 1073 bcopy(mic.value, rqst->rq_verf.oa_base, mic.length); 1074 1075 gss_release_buffer(&min_stat, &mic); 1076 1077 return (TRUE); 1078 } 1079 1080 static bool_t 1081 svc_rpc_gss_callback(struct svc_rpc_gss_client *client, struct svc_req *rqst) 1082 { 1083 struct svc_rpc_gss_callback *scb; 1084 rpc_gss_lock_t lock; 1085 void *cookie; 1086 bool_t cb_res; 1087 bool_t result; 1088 1089 /* 1090 * See if we have a callback for this guy. 1091 */ 1092 result = TRUE; 1093 SLIST_FOREACH(scb, &svc_rpc_gss_callbacks, cb_link) { 1094 if (scb->cb_callback.program == rqst->rq_prog 1095 && scb->cb_callback.version == rqst->rq_vers) { 1096 /* 1097 * This one matches. Call the callback and see 1098 * if it wants to veto or something. 1099 */ 1100 lock.locked = FALSE; 1101 lock.raw_cred = &client->cl_rawcred; 1102 cb_res = scb->cb_callback.callback(rqst, 1103 client->cl_creds, 1104 client->cl_ctx, 1105 &lock, 1106 &cookie); 1107 1108 if (!cb_res) { 1109 client->cl_state = CLIENT_STALE; 1110 result = FALSE; 1111 break; 1112 } 1113 1114 /* 1115 * The callback accepted the connection - it 1116 * is responsible for freeing client->cl_creds 1117 * now. 1118 */ 1119 client->cl_creds = GSS_C_NO_CREDENTIAL; 1120 client->cl_locked = lock.locked; 1121 client->cl_cookie = cookie; 1122 return (TRUE); 1123 } 1124 } 1125 1126 /* 1127 * Either no callback exists for this program/version or one 1128 * of the callbacks rejected the connection. We just need to 1129 * clean up the delegated client creds, if any. 1130 */ 1131 if (client->cl_creds) { 1132 OM_uint32 min_ver; 1133 gss_release_cred(&min_ver, &client->cl_creds); 1134 } 1135 return (result); 1136 } 1137 1138 static bool_t 1139 svc_rpc_gss_check_replay(struct svc_rpc_gss_client *client, uint32_t seq) 1140 { 1141 u_int32_t offset; 1142 int word, bit; 1143 bool_t result; 1144 1145 sx_xlock(&client->cl_lock); 1146 if (seq <= client->cl_seqlast) { 1147 /* 1148 * The request sequence number is less than 1149 * the largest we have seen so far. If it is 1150 * outside the window or if we have seen a 1151 * request with this sequence before, silently 1152 * discard it. 1153 */ 1154 offset = client->cl_seqlast - seq; 1155 if (offset >= SVC_RPC_GSS_SEQWINDOW) { 1156 result = FALSE; 1157 goto out; 1158 } 1159 word = offset / 32; 1160 bit = offset % 32; 1161 if (client->cl_seqmask[word] & (1 << bit)) { 1162 result = FALSE; 1163 goto out; 1164 } 1165 } 1166 1167 result = TRUE; 1168 out: 1169 sx_xunlock(&client->cl_lock); 1170 return (result); 1171 } 1172 1173 static void 1174 svc_rpc_gss_update_seq(struct svc_rpc_gss_client *client, uint32_t seq) 1175 { 1176 int offset, i, word, bit; 1177 uint32_t carry, newcarry; 1178 1179 sx_xlock(&client->cl_lock); 1180 if (seq > client->cl_seqlast) { 1181 /* 1182 * This request has a sequence number greater 1183 * than any we have seen so far. Advance the 1184 * seq window and set bit zero of the window 1185 * (which corresponds to the new sequence 1186 * number) 1187 */ 1188 offset = seq - client->cl_seqlast; 1189 while (offset > 32) { 1190 for (i = (SVC_RPC_GSS_SEQWINDOW / 32) - 1; 1191 i > 0; i--) { 1192 client->cl_seqmask[i] = client->cl_seqmask[i-1]; 1193 } 1194 client->cl_seqmask[0] = 0; 1195 offset -= 32; 1196 } 1197 carry = 0; 1198 for (i = 0; i < SVC_RPC_GSS_SEQWINDOW / 32; i++) { 1199 newcarry = client->cl_seqmask[i] >> (32 - offset); 1200 client->cl_seqmask[i] = 1201 (client->cl_seqmask[i] << offset) | carry; 1202 carry = newcarry; 1203 } 1204 client->cl_seqmask[0] |= 1; 1205 client->cl_seqlast = seq; 1206 } else { 1207 offset = client->cl_seqlast - seq; 1208 word = offset / 32; 1209 bit = offset % 32; 1210 client->cl_seqmask[word] |= (1 << bit); 1211 } 1212 sx_xunlock(&client->cl_lock); 1213 } 1214 1215 enum auth_stat 1216 svc_rpc_gss(struct svc_req *rqst, struct rpc_msg *msg) 1217 1218 { 1219 OM_uint32 min_stat; 1220 XDR xdrs; 1221 struct svc_rpc_gss_cookedcred *cc; 1222 struct svc_rpc_gss_client *client; 1223 struct rpc_gss_cred gc; 1224 struct rpc_gss_init_res gr; 1225 gss_qop_t qop; 1226 int call_stat; 1227 enum auth_stat result; 1228 1229 rpc_gss_log_debug("in svc_rpc_gss()"); 1230 1231 /* Garbage collect old clients. */ 1232 svc_rpc_gss_timeout_clients(); 1233 1234 /* Initialize reply. */ 1235 rqst->rq_verf = _null_auth; 1236 1237 /* Deserialize client credentials. */ 1238 if (rqst->rq_cred.oa_length <= 0) 1239 return (AUTH_BADCRED); 1240 1241 memset(&gc, 0, sizeof(gc)); 1242 1243 xdrmem_create(&xdrs, rqst->rq_cred.oa_base, 1244 rqst->rq_cred.oa_length, XDR_DECODE); 1245 1246 if (!xdr_rpc_gss_cred(&xdrs, &gc)) { 1247 XDR_DESTROY(&xdrs); 1248 return (AUTH_BADCRED); 1249 } 1250 XDR_DESTROY(&xdrs); 1251 1252 client = NULL; 1253 1254 /* Check version. */ 1255 if (gc.gc_version != RPCSEC_GSS_VERSION) { 1256 result = AUTH_BADCRED; 1257 goto out; 1258 } 1259 1260 /* Check the proc and find the client (or create it) */ 1261 if (gc.gc_proc == RPCSEC_GSS_INIT) { 1262 if (gc.gc_handle.length != 0) { 1263 result = AUTH_BADCRED; 1264 goto out; 1265 } 1266 client = svc_rpc_gss_create_client(); 1267 refcount_acquire(&client->cl_refs); 1268 } else { 1269 struct svc_rpc_gss_clientid *p; 1270 if (gc.gc_handle.length != sizeof(*p)) { 1271 result = AUTH_BADCRED; 1272 goto out; 1273 } 1274 p = gc.gc_handle.value; 1275 client = svc_rpc_gss_find_client(p); 1276 if (!client) { 1277 /* 1278 * Can't find the client - we may have 1279 * destroyed it - tell the other side to 1280 * re-authenticate. 1281 */ 1282 result = RPCSEC_GSS_CREDPROBLEM; 1283 goto out; 1284 } 1285 } 1286 cc = rqst->rq_clntcred; 1287 cc->cc_client = client; 1288 cc->cc_service = gc.gc_svc; 1289 cc->cc_seq = gc.gc_seq; 1290 1291 /* 1292 * The service and sequence number must be ignored for 1293 * RPCSEC_GSS_INIT and RPCSEC_GSS_CONTINUE_INIT. 1294 */ 1295 if (gc.gc_proc != RPCSEC_GSS_INIT 1296 && gc.gc_proc != RPCSEC_GSS_CONTINUE_INIT) { 1297 /* 1298 * Check for sequence number overflow. 1299 */ 1300 if (gc.gc_seq >= MAXSEQ) { 1301 result = RPCSEC_GSS_CTXPROBLEM; 1302 goto out; 1303 } 1304 1305 /* 1306 * Check for valid service. 1307 */ 1308 if (gc.gc_svc != rpc_gss_svc_none && 1309 gc.gc_svc != rpc_gss_svc_integrity && 1310 gc.gc_svc != rpc_gss_svc_privacy) { 1311 result = AUTH_BADCRED; 1312 goto out; 1313 } 1314 } 1315 1316 /* Handle RPCSEC_GSS control procedure. */ 1317 switch (gc.gc_proc) { 1318 1319 case RPCSEC_GSS_INIT: 1320 case RPCSEC_GSS_CONTINUE_INIT: 1321 if (rqst->rq_proc != NULLPROC) { 1322 result = AUTH_REJECTEDCRED; 1323 break; 1324 } 1325 1326 memset(&gr, 0, sizeof(gr)); 1327 if (!svc_rpc_gss_accept_sec_context(client, rqst, &gr, &gc)) { 1328 result = AUTH_REJECTEDCRED; 1329 break; 1330 } 1331 1332 if (gr.gr_major == GSS_S_COMPLETE) { 1333 /* 1334 * We borrow the space for the call verf to 1335 * pack our reply verf. 1336 */ 1337 rqst->rq_verf = msg->rm_call.cb_verf; 1338 if (!svc_rpc_gss_nextverf(client, rqst, gr.gr_win)) { 1339 result = AUTH_REJECTEDCRED; 1340 break; 1341 } 1342 } else { 1343 rqst->rq_verf = _null_auth; 1344 } 1345 1346 call_stat = svc_sendreply(rqst, 1347 (xdrproc_t) xdr_rpc_gss_init_res, 1348 (caddr_t) &gr); 1349 1350 gss_release_buffer(&min_stat, &gr.gr_token); 1351 1352 if (!call_stat) { 1353 result = AUTH_FAILED; 1354 break; 1355 } 1356 1357 if (gr.gr_major == GSS_S_COMPLETE) 1358 client->cl_state = CLIENT_ESTABLISHED; 1359 1360 result = RPCSEC_GSS_NODISPATCH; 1361 break; 1362 1363 case RPCSEC_GSS_DATA: 1364 case RPCSEC_GSS_DESTROY: 1365 if (!svc_rpc_gss_check_replay(client, gc.gc_seq)) { 1366 result = RPCSEC_GSS_NODISPATCH; 1367 break; 1368 } 1369 1370 if (!svc_rpc_gss_validate(client, msg, &qop, gc.gc_proc)) { 1371 result = RPCSEC_GSS_CREDPROBLEM; 1372 break; 1373 } 1374 1375 /* 1376 * We borrow the space for the call verf to pack our 1377 * reply verf. 1378 */ 1379 rqst->rq_verf = msg->rm_call.cb_verf; 1380 if (!svc_rpc_gss_nextverf(client, rqst, gc.gc_seq)) { 1381 result = RPCSEC_GSS_CTXPROBLEM; 1382 break; 1383 } 1384 1385 svc_rpc_gss_update_seq(client, gc.gc_seq); 1386 1387 /* 1388 * Change the SVCAUTH ops on the request to point at 1389 * our own code so that we can unwrap the arguments 1390 * and wrap the result. The caller will re-set this on 1391 * every request to point to a set of null wrap/unwrap 1392 * methods. Acquire an extra reference to the client 1393 * which will be released by svc_rpc_gss_release() 1394 * after the request has finished processing. 1395 */ 1396 refcount_acquire(&client->cl_refs); 1397 rqst->rq_auth.svc_ah_ops = &svc_auth_gss_ops; 1398 rqst->rq_auth.svc_ah_private = cc; 1399 1400 if (gc.gc_proc == RPCSEC_GSS_DATA) { 1401 /* 1402 * We might be ready to do a callback to the server to 1403 * see if it wants to accept/reject the connection. 1404 */ 1405 sx_xlock(&client->cl_lock); 1406 if (!client->cl_done_callback) { 1407 client->cl_done_callback = TRUE; 1408 client->cl_qop = qop; 1409 client->cl_rawcred.qop = _rpc_gss_num_to_qop( 1410 client->cl_rawcred.mechanism, qop); 1411 if (!svc_rpc_gss_callback(client, rqst)) { 1412 result = AUTH_REJECTEDCRED; 1413 sx_xunlock(&client->cl_lock); 1414 break; 1415 } 1416 } 1417 sx_xunlock(&client->cl_lock); 1418 1419 /* 1420 * If the server has locked this client to a 1421 * particular service+qop pair, enforce that 1422 * restriction now. 1423 */ 1424 if (client->cl_locked) { 1425 if (client->cl_rawcred.service != gc.gc_svc) { 1426 result = AUTH_FAILED; 1427 break; 1428 } else if (client->cl_qop != qop) { 1429 result = AUTH_BADVERF; 1430 break; 1431 } 1432 } 1433 1434 /* 1435 * If the qop changed, look up the new qop 1436 * name for rawcred. 1437 */ 1438 if (client->cl_qop != qop) { 1439 client->cl_qop = qop; 1440 client->cl_rawcred.qop = _rpc_gss_num_to_qop( 1441 client->cl_rawcred.mechanism, qop); 1442 } 1443 1444 /* 1445 * Make sure we use the right service value 1446 * for unwrap/wrap. 1447 */ 1448 if (client->cl_rawcred.service != gc.gc_svc) { 1449 client->cl_rawcred.service = gc.gc_svc; 1450 svc_rpc_gss_set_flavor(client); 1451 } 1452 1453 result = AUTH_OK; 1454 } else { 1455 if (rqst->rq_proc != NULLPROC) { 1456 result = AUTH_REJECTEDCRED; 1457 break; 1458 } 1459 1460 call_stat = svc_sendreply(rqst, 1461 (xdrproc_t) xdr_void, (caddr_t) NULL); 1462 1463 if (!call_stat) { 1464 result = AUTH_FAILED; 1465 break; 1466 } 1467 1468 svc_rpc_gss_forget_client(client); 1469 1470 result = RPCSEC_GSS_NODISPATCH; 1471 break; 1472 } 1473 break; 1474 1475 default: 1476 result = AUTH_BADCRED; 1477 break; 1478 } 1479 out: 1480 if (client) 1481 svc_rpc_gss_release_client(client); 1482 1483 xdr_free((xdrproc_t) xdr_rpc_gss_cred, (char *) &gc); 1484 return (result); 1485 } 1486 1487 static bool_t 1488 svc_rpc_gss_wrap(SVCAUTH *auth, struct mbuf **mp) 1489 { 1490 struct svc_rpc_gss_cookedcred *cc; 1491 struct svc_rpc_gss_client *client; 1492 1493 rpc_gss_log_debug("in svc_rpc_gss_wrap()"); 1494 1495 cc = (struct svc_rpc_gss_cookedcred *) auth->svc_ah_private; 1496 client = cc->cc_client; 1497 if (client->cl_state != CLIENT_ESTABLISHED 1498 || cc->cc_service == rpc_gss_svc_none || *mp == NULL) { 1499 return (TRUE); 1500 } 1501 1502 return (xdr_rpc_gss_wrap_data(mp, 1503 client->cl_ctx, client->cl_qop, 1504 cc->cc_service, cc->cc_seq)); 1505 } 1506 1507 static bool_t 1508 svc_rpc_gss_unwrap(SVCAUTH *auth, struct mbuf **mp) 1509 { 1510 struct svc_rpc_gss_cookedcred *cc; 1511 struct svc_rpc_gss_client *client; 1512 1513 rpc_gss_log_debug("in svc_rpc_gss_unwrap()"); 1514 1515 cc = (struct svc_rpc_gss_cookedcred *) auth->svc_ah_private; 1516 client = cc->cc_client; 1517 if (client->cl_state != CLIENT_ESTABLISHED 1518 || cc->cc_service == rpc_gss_svc_none) { 1519 return (TRUE); 1520 } 1521 1522 return (xdr_rpc_gss_unwrap_data(mp, 1523 client->cl_ctx, client->cl_qop, 1524 cc->cc_service, cc->cc_seq)); 1525 } 1526 1527 static void 1528 svc_rpc_gss_release(SVCAUTH *auth) 1529 { 1530 struct svc_rpc_gss_cookedcred *cc; 1531 struct svc_rpc_gss_client *client; 1532 1533 rpc_gss_log_debug("in svc_rpc_gss_release()"); 1534 1535 cc = (struct svc_rpc_gss_cookedcred *) auth->svc_ah_private; 1536 client = cc->cc_client; 1537 svc_rpc_gss_release_client(client); 1538 }
Cache object: bb360d81417706eb39e496cb08b9b3b0
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