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("$FreeBSD$"); 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 if (gcproc != RPCSEC_GSS_DESTROY) 1028 client->cl_state = CLIENT_STALE; 1029 return (FALSE); 1030 } 1031 1032 *qop = qop_state; 1033 return (TRUE); 1034 } 1035 1036 static bool_t 1037 svc_rpc_gss_nextverf(struct svc_rpc_gss_client *client, 1038 struct svc_req *rqst, u_int seq) 1039 { 1040 gss_buffer_desc signbuf; 1041 gss_buffer_desc mic; 1042 OM_uint32 maj_stat, min_stat; 1043 uint32_t nseq; 1044 1045 rpc_gss_log_debug("in svc_rpc_gss_nextverf()"); 1046 1047 nseq = htonl(seq); 1048 signbuf.value = &nseq; 1049 signbuf.length = sizeof(nseq); 1050 1051 maj_stat = gss_get_mic(&min_stat, client->cl_ctx, client->cl_qop, 1052 &signbuf, &mic); 1053 1054 if (maj_stat != GSS_S_COMPLETE) { 1055 rpc_gss_log_status("gss_get_mic", client->cl_mech, maj_stat, min_stat); 1056 client->cl_state = CLIENT_STALE; 1057 return (FALSE); 1058 } 1059 1060 KASSERT(mic.length <= MAX_AUTH_BYTES, 1061 ("MIC too large for RPCSEC_GSS")); 1062 1063 rqst->rq_verf.oa_flavor = RPCSEC_GSS; 1064 rqst->rq_verf.oa_length = mic.length; 1065 bcopy(mic.value, rqst->rq_verf.oa_base, mic.length); 1066 1067 gss_release_buffer(&min_stat, &mic); 1068 1069 return (TRUE); 1070 } 1071 1072 static bool_t 1073 svc_rpc_gss_callback(struct svc_rpc_gss_client *client, struct svc_req *rqst) 1074 { 1075 struct svc_rpc_gss_callback *scb; 1076 rpc_gss_lock_t lock; 1077 void *cookie; 1078 bool_t cb_res; 1079 bool_t result; 1080 1081 /* 1082 * See if we have a callback for this guy. 1083 */ 1084 result = TRUE; 1085 SLIST_FOREACH(scb, &svc_rpc_gss_callbacks, cb_link) { 1086 if (scb->cb_callback.program == rqst->rq_prog 1087 && scb->cb_callback.version == rqst->rq_vers) { 1088 /* 1089 * This one matches. Call the callback and see 1090 * if it wants to veto or something. 1091 */ 1092 lock.locked = FALSE; 1093 lock.raw_cred = &client->cl_rawcred; 1094 cb_res = scb->cb_callback.callback(rqst, 1095 client->cl_creds, 1096 client->cl_ctx, 1097 &lock, 1098 &cookie); 1099 1100 if (!cb_res) { 1101 client->cl_state = CLIENT_STALE; 1102 result = FALSE; 1103 break; 1104 } 1105 1106 /* 1107 * The callback accepted the connection - it 1108 * is responsible for freeing client->cl_creds 1109 * now. 1110 */ 1111 client->cl_creds = GSS_C_NO_CREDENTIAL; 1112 client->cl_locked = lock.locked; 1113 client->cl_cookie = cookie; 1114 return (TRUE); 1115 } 1116 } 1117 1118 /* 1119 * Either no callback exists for this program/version or one 1120 * of the callbacks rejected the connection. We just need to 1121 * clean up the delegated client creds, if any. 1122 */ 1123 if (client->cl_creds) { 1124 OM_uint32 min_ver; 1125 gss_release_cred(&min_ver, &client->cl_creds); 1126 } 1127 return (result); 1128 } 1129 1130 static bool_t 1131 svc_rpc_gss_check_replay(struct svc_rpc_gss_client *client, uint32_t seq) 1132 { 1133 u_int32_t offset; 1134 int word, bit; 1135 bool_t result; 1136 1137 sx_xlock(&client->cl_lock); 1138 if (seq <= client->cl_seqlast) { 1139 /* 1140 * The request sequence number is less than 1141 * the largest we have seen so far. If it is 1142 * outside the window or if we have seen a 1143 * request with this sequence before, silently 1144 * discard it. 1145 */ 1146 offset = client->cl_seqlast - seq; 1147 if (offset >= SVC_RPC_GSS_SEQWINDOW) { 1148 result = FALSE; 1149 goto out; 1150 } 1151 word = offset / 32; 1152 bit = offset % 32; 1153 if (client->cl_seqmask[word] & (1 << bit)) { 1154 result = FALSE; 1155 goto out; 1156 } 1157 } 1158 1159 result = TRUE; 1160 out: 1161 sx_xunlock(&client->cl_lock); 1162 return (result); 1163 } 1164 1165 static void 1166 svc_rpc_gss_update_seq(struct svc_rpc_gss_client *client, uint32_t seq) 1167 { 1168 int offset, i, word, bit; 1169 uint32_t carry, newcarry; 1170 1171 sx_xlock(&client->cl_lock); 1172 if (seq > client->cl_seqlast) { 1173 /* 1174 * This request has a sequence number greater 1175 * than any we have seen so far. Advance the 1176 * seq window and set bit zero of the window 1177 * (which corresponds to the new sequence 1178 * number) 1179 */ 1180 offset = seq - client->cl_seqlast; 1181 while (offset > 32) { 1182 for (i = (SVC_RPC_GSS_SEQWINDOW / 32) - 1; 1183 i > 0; i--) { 1184 client->cl_seqmask[i] = client->cl_seqmask[i-1]; 1185 } 1186 client->cl_seqmask[0] = 0; 1187 offset -= 32; 1188 } 1189 carry = 0; 1190 for (i = 0; i < SVC_RPC_GSS_SEQWINDOW / 32; i++) { 1191 newcarry = client->cl_seqmask[i] >> (32 - offset); 1192 client->cl_seqmask[i] = 1193 (client->cl_seqmask[i] << offset) | carry; 1194 carry = newcarry; 1195 } 1196 client->cl_seqmask[0] |= 1; 1197 client->cl_seqlast = seq; 1198 } else { 1199 offset = client->cl_seqlast - seq; 1200 word = offset / 32; 1201 bit = offset % 32; 1202 client->cl_seqmask[word] |= (1 << bit); 1203 } 1204 sx_xunlock(&client->cl_lock); 1205 } 1206 1207 enum auth_stat 1208 svc_rpc_gss(struct svc_req *rqst, struct rpc_msg *msg) 1209 1210 { 1211 OM_uint32 min_stat; 1212 XDR xdrs; 1213 struct svc_rpc_gss_cookedcred *cc; 1214 struct svc_rpc_gss_client *client; 1215 struct rpc_gss_cred gc; 1216 struct rpc_gss_init_res gr; 1217 gss_qop_t qop; 1218 int call_stat; 1219 enum auth_stat result; 1220 1221 rpc_gss_log_debug("in svc_rpc_gss()"); 1222 1223 /* Garbage collect old clients. */ 1224 svc_rpc_gss_timeout_clients(); 1225 1226 /* Initialize reply. */ 1227 rqst->rq_verf = _null_auth; 1228 1229 /* Deserialize client credentials. */ 1230 if (rqst->rq_cred.oa_length <= 0) 1231 return (AUTH_BADCRED); 1232 1233 memset(&gc, 0, sizeof(gc)); 1234 1235 xdrmem_create(&xdrs, rqst->rq_cred.oa_base, 1236 rqst->rq_cred.oa_length, XDR_DECODE); 1237 1238 if (!xdr_rpc_gss_cred(&xdrs, &gc)) { 1239 XDR_DESTROY(&xdrs); 1240 return (AUTH_BADCRED); 1241 } 1242 XDR_DESTROY(&xdrs); 1243 1244 client = NULL; 1245 1246 /* Check version. */ 1247 if (gc.gc_version != RPCSEC_GSS_VERSION) { 1248 result = AUTH_BADCRED; 1249 goto out; 1250 } 1251 1252 /* Check the proc and find the client (or create it) */ 1253 if (gc.gc_proc == RPCSEC_GSS_INIT) { 1254 if (gc.gc_handle.length != 0) { 1255 result = AUTH_BADCRED; 1256 goto out; 1257 } 1258 client = svc_rpc_gss_create_client(); 1259 refcount_acquire(&client->cl_refs); 1260 } else { 1261 struct svc_rpc_gss_clientid *p; 1262 if (gc.gc_handle.length != sizeof(*p)) { 1263 result = AUTH_BADCRED; 1264 goto out; 1265 } 1266 p = gc.gc_handle.value; 1267 client = svc_rpc_gss_find_client(p); 1268 if (!client) { 1269 /* 1270 * Can't find the client - we may have 1271 * destroyed it - tell the other side to 1272 * re-authenticate. 1273 */ 1274 result = RPCSEC_GSS_CREDPROBLEM; 1275 goto out; 1276 } 1277 } 1278 cc = rqst->rq_clntcred; 1279 cc->cc_client = client; 1280 cc->cc_service = gc.gc_svc; 1281 cc->cc_seq = gc.gc_seq; 1282 1283 /* 1284 * The service and sequence number must be ignored for 1285 * RPCSEC_GSS_INIT and RPCSEC_GSS_CONTINUE_INIT. 1286 */ 1287 if (gc.gc_proc != RPCSEC_GSS_INIT 1288 && gc.gc_proc != RPCSEC_GSS_CONTINUE_INIT) { 1289 /* 1290 * Check for sequence number overflow. 1291 */ 1292 if (gc.gc_seq >= MAXSEQ) { 1293 result = RPCSEC_GSS_CTXPROBLEM; 1294 goto out; 1295 } 1296 1297 /* 1298 * Check for valid service. 1299 */ 1300 if (gc.gc_svc != rpc_gss_svc_none && 1301 gc.gc_svc != rpc_gss_svc_integrity && 1302 gc.gc_svc != rpc_gss_svc_privacy) { 1303 result = AUTH_BADCRED; 1304 goto out; 1305 } 1306 } 1307 1308 /* Handle RPCSEC_GSS control procedure. */ 1309 switch (gc.gc_proc) { 1310 1311 case RPCSEC_GSS_INIT: 1312 case RPCSEC_GSS_CONTINUE_INIT: 1313 if (rqst->rq_proc != NULLPROC) { 1314 result = AUTH_REJECTEDCRED; 1315 break; 1316 } 1317 1318 memset(&gr, 0, sizeof(gr)); 1319 if (!svc_rpc_gss_accept_sec_context(client, rqst, &gr, &gc)) { 1320 result = AUTH_REJECTEDCRED; 1321 break; 1322 } 1323 1324 if (gr.gr_major == GSS_S_COMPLETE) { 1325 /* 1326 * We borrow the space for the call verf to 1327 * pack our reply verf. 1328 */ 1329 rqst->rq_verf = msg->rm_call.cb_verf; 1330 if (!svc_rpc_gss_nextverf(client, rqst, gr.gr_win)) { 1331 result = AUTH_REJECTEDCRED; 1332 break; 1333 } 1334 } else { 1335 rqst->rq_verf = _null_auth; 1336 } 1337 1338 call_stat = svc_sendreply(rqst, 1339 (xdrproc_t) xdr_rpc_gss_init_res, 1340 (caddr_t) &gr); 1341 1342 gss_release_buffer(&min_stat, &gr.gr_token); 1343 1344 if (!call_stat) { 1345 result = AUTH_FAILED; 1346 break; 1347 } 1348 1349 if (gr.gr_major == GSS_S_COMPLETE) 1350 client->cl_state = CLIENT_ESTABLISHED; 1351 1352 result = RPCSEC_GSS_NODISPATCH; 1353 break; 1354 1355 case RPCSEC_GSS_DATA: 1356 case RPCSEC_GSS_DESTROY: 1357 if (!svc_rpc_gss_check_replay(client, gc.gc_seq)) { 1358 result = RPCSEC_GSS_NODISPATCH; 1359 break; 1360 } 1361 1362 if (!svc_rpc_gss_validate(client, msg, &qop, gc.gc_proc)) { 1363 result = RPCSEC_GSS_CREDPROBLEM; 1364 break; 1365 } 1366 1367 /* 1368 * We borrow the space for the call verf to pack our 1369 * reply verf. 1370 */ 1371 rqst->rq_verf = msg->rm_call.cb_verf; 1372 if (!svc_rpc_gss_nextverf(client, rqst, gc.gc_seq)) { 1373 result = RPCSEC_GSS_CTXPROBLEM; 1374 break; 1375 } 1376 1377 svc_rpc_gss_update_seq(client, gc.gc_seq); 1378 1379 /* 1380 * Change the SVCAUTH ops on the request to point at 1381 * our own code so that we can unwrap the arguments 1382 * and wrap the result. The caller will re-set this on 1383 * every request to point to a set of null wrap/unwrap 1384 * methods. Acquire an extra reference to the client 1385 * which will be released by svc_rpc_gss_release() 1386 * after the request has finished processing. 1387 */ 1388 refcount_acquire(&client->cl_refs); 1389 rqst->rq_auth.svc_ah_ops = &svc_auth_gss_ops; 1390 rqst->rq_auth.svc_ah_private = cc; 1391 1392 if (gc.gc_proc == RPCSEC_GSS_DATA) { 1393 /* 1394 * We might be ready to do a callback to the server to 1395 * see if it wants to accept/reject the connection. 1396 */ 1397 sx_xlock(&client->cl_lock); 1398 if (!client->cl_done_callback) { 1399 client->cl_done_callback = TRUE; 1400 client->cl_qop = qop; 1401 client->cl_rawcred.qop = _rpc_gss_num_to_qop( 1402 client->cl_rawcred.mechanism, qop); 1403 if (!svc_rpc_gss_callback(client, rqst)) { 1404 result = AUTH_REJECTEDCRED; 1405 sx_xunlock(&client->cl_lock); 1406 break; 1407 } 1408 } 1409 sx_xunlock(&client->cl_lock); 1410 1411 /* 1412 * If the server has locked this client to a 1413 * particular service+qop pair, enforce that 1414 * restriction now. 1415 */ 1416 if (client->cl_locked) { 1417 if (client->cl_rawcred.service != gc.gc_svc) { 1418 result = AUTH_FAILED; 1419 break; 1420 } else if (client->cl_qop != qop) { 1421 result = AUTH_BADVERF; 1422 break; 1423 } 1424 } 1425 1426 /* 1427 * If the qop changed, look up the new qop 1428 * name for rawcred. 1429 */ 1430 if (client->cl_qop != qop) { 1431 client->cl_qop = qop; 1432 client->cl_rawcred.qop = _rpc_gss_num_to_qop( 1433 client->cl_rawcred.mechanism, qop); 1434 } 1435 1436 /* 1437 * Make sure we use the right service value 1438 * for unwrap/wrap. 1439 */ 1440 if (client->cl_rawcred.service != gc.gc_svc) { 1441 client->cl_rawcred.service = gc.gc_svc; 1442 svc_rpc_gss_set_flavor(client); 1443 } 1444 1445 result = AUTH_OK; 1446 } else { 1447 if (rqst->rq_proc != NULLPROC) { 1448 result = AUTH_REJECTEDCRED; 1449 break; 1450 } 1451 1452 call_stat = svc_sendreply(rqst, 1453 (xdrproc_t) xdr_void, (caddr_t) NULL); 1454 1455 if (!call_stat) { 1456 result = AUTH_FAILED; 1457 break; 1458 } 1459 1460 svc_rpc_gss_forget_client(client); 1461 1462 result = RPCSEC_GSS_NODISPATCH; 1463 break; 1464 } 1465 break; 1466 1467 default: 1468 result = AUTH_BADCRED; 1469 break; 1470 } 1471 out: 1472 if (client) 1473 svc_rpc_gss_release_client(client); 1474 1475 xdr_free((xdrproc_t) xdr_rpc_gss_cred, (char *) &gc); 1476 return (result); 1477 } 1478 1479 static bool_t 1480 svc_rpc_gss_wrap(SVCAUTH *auth, struct mbuf **mp) 1481 { 1482 struct svc_rpc_gss_cookedcred *cc; 1483 struct svc_rpc_gss_client *client; 1484 1485 rpc_gss_log_debug("in svc_rpc_gss_wrap()"); 1486 1487 cc = (struct svc_rpc_gss_cookedcred *) auth->svc_ah_private; 1488 client = cc->cc_client; 1489 if (client->cl_state != CLIENT_ESTABLISHED 1490 || cc->cc_service == rpc_gss_svc_none || *mp == NULL) { 1491 return (TRUE); 1492 } 1493 1494 return (xdr_rpc_gss_wrap_data(mp, 1495 client->cl_ctx, client->cl_qop, 1496 cc->cc_service, cc->cc_seq)); 1497 } 1498 1499 static bool_t 1500 svc_rpc_gss_unwrap(SVCAUTH *auth, struct mbuf **mp) 1501 { 1502 struct svc_rpc_gss_cookedcred *cc; 1503 struct svc_rpc_gss_client *client; 1504 1505 rpc_gss_log_debug("in svc_rpc_gss_unwrap()"); 1506 1507 cc = (struct svc_rpc_gss_cookedcred *) auth->svc_ah_private; 1508 client = cc->cc_client; 1509 if (client->cl_state != CLIENT_ESTABLISHED 1510 || cc->cc_service == rpc_gss_svc_none) { 1511 return (TRUE); 1512 } 1513 1514 return (xdr_rpc_gss_unwrap_data(mp, 1515 client->cl_ctx, client->cl_qop, 1516 cc->cc_service, cc->cc_seq)); 1517 } 1518 1519 static void 1520 svc_rpc_gss_release(SVCAUTH *auth) 1521 { 1522 struct svc_rpc_gss_cookedcred *cc; 1523 struct svc_rpc_gss_client *client; 1524 1525 rpc_gss_log_debug("in svc_rpc_gss_release()"); 1526 1527 cc = (struct svc_rpc_gss_cookedcred *) auth->svc_ah_private; 1528 client = cc->cc_client; 1529 svc_rpc_gss_release_client(client); 1530 } 1531