1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 /* 31 * Copyright (c) 1988 by Sun Microsystems, Inc. 32 */ 33 /* 34 * auth_des.c, client-side implementation of DES authentication 35 */ 36 37 #include "namespace.h" 38 #include "reentrant.h" 39 #include <err.h> 40 #include <errno.h> 41 #include <string.h> 42 #include <stdlib.h> 43 #include <unistd.h> 44 #include <sys/cdefs.h> 45 #include <rpc/des_crypt.h> 46 #include <syslog.h> 47 #include <rpc/types.h> 48 #include <rpc/auth.h> 49 #include <rpc/auth_des.h> 50 #include <rpc/clnt.h> 51 #include <rpc/xdr.h> 52 #include <sys/socket.h> 53 #undef NIS 54 #include <rpcsvc/nis.h> 55 #include "un-namespace.h" 56 #include "mt_misc.h" 57 58 #if defined(LIBC_SCCS) && !defined(lint) 59 static char sccsid[] = "@(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI"; 60 #endif 61 #include <sys/cdefs.h> 62 __FBSDID("$FreeBSD$"); 63 64 #define USEC_PER_SEC 1000000 65 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */ 66 67 #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private 68 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type)) 69 #define FREE(ptr, size) mem_free((char *)(ptr), (int) size) 70 #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE) 71 72 extern bool_t xdr_authdes_cred( XDR *, struct authdes_cred *); 73 extern bool_t xdr_authdes_verf( XDR *, struct authdes_verf *); 74 extern int key_encryptsession_pk(char *, netobj *, des_block *); 75 76 extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *, 77 char **, char **); 78 79 /* 80 * DES authenticator operations vector 81 */ 82 static void authdes_nextverf(AUTH *); 83 static bool_t authdes_marshal(AUTH *, XDR *); 84 static bool_t authdes_validate(AUTH *, struct opaque_auth *); 85 static bool_t authdes_refresh(AUTH *, void *); 86 static void authdes_destroy(AUTH *); 87 88 static struct auth_ops *authdes_ops(void); 89 90 /* 91 * This struct is pointed to by the ah_private field of an "AUTH *" 92 */ 93 struct ad_private { 94 char *ad_fullname; /* client's full name */ 95 u_int ad_fullnamelen; /* length of name, rounded up */ 96 char *ad_servername; /* server's full name */ 97 u_int ad_servernamelen; /* length of name, rounded up */ 98 u_int ad_window; /* client specified window */ 99 bool_t ad_dosync; /* synchronize? */ 100 struct netbuf ad_syncaddr; /* remote host to synch with */ 101 char *ad_timehost; /* remote host to synch with */ 102 struct timeval ad_timediff; /* server's time - client's time */ 103 u_int ad_nickname; /* server's nickname for client */ 104 struct authdes_cred ad_cred; /* storage for credential */ 105 struct authdes_verf ad_verf; /* storage for verifier */ 106 struct timeval ad_timestamp; /* timestamp sent */ 107 des_block ad_xkey; /* encrypted conversation key */ 108 u_char ad_pkey[1024]; /* Server's actual public key */ 109 char *ad_netid; /* Timehost netid */ 110 char *ad_uaddr; /* Timehost uaddr */ 111 nis_server *ad_nis_srvr; /* NIS+ server struct */ 112 }; 113 114 AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *, 115 const des_block *, nis_server *); 116 117 /* 118 * documented version of authdes_seccreate 119 */ 120 /* 121 servername: network name of server 122 win: time to live 123 timehost: optional hostname to sync with 124 ckey: optional conversation key to use 125 */ 126 127 AUTH * 128 authdes_seccreate(const char *servername, const u_int win, 129 const char *timehost, const des_block *ckey) 130 { 131 u_char pkey_data[1024]; 132 netobj pkey; 133 AUTH *dummy; 134 135 if (! getpublickey(servername, (char *) pkey_data)) { 136 syslog(LOG_ERR, 137 "authdes_seccreate: no public key found for %s", 138 servername); 139 return (NULL); 140 } 141 142 pkey.n_bytes = (char *) pkey_data; 143 pkey.n_len = (u_int)strlen((char *)pkey_data) + 1; 144 dummy = authdes_pk_seccreate(servername, &pkey, win, timehost, 145 ckey, NULL); 146 return (dummy); 147 } 148 149 /* 150 * Slightly modified version of authdessec_create which takes the public key 151 * of the server principal as an argument. This spares us a call to 152 * getpublickey() which in the nameserver context can cause a deadlock. 153 */ 154 AUTH * 155 authdes_pk_seccreate(const char *servername, netobj *pkey, u_int window, 156 const char *timehost, const des_block *ckey, nis_server *srvr) 157 { 158 AUTH *auth; 159 struct ad_private *ad; 160 char namebuf[MAXNETNAMELEN+1]; 161 162 /* 163 * Allocate everything now 164 */ 165 auth = ALLOC(AUTH); 166 if (auth == NULL) { 167 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory"); 168 return (NULL); 169 } 170 ad = ALLOC(struct ad_private); 171 if (ad == NULL) { 172 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory"); 173 goto failed; 174 } 175 ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */ 176 ad->ad_timehost = NULL; 177 ad->ad_netid = NULL; 178 ad->ad_uaddr = NULL; 179 ad->ad_nis_srvr = NULL; 180 ad->ad_timediff.tv_sec = 0; 181 ad->ad_timediff.tv_usec = 0; 182 memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len); 183 if (!getnetname(namebuf)) 184 goto failed; 185 ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf)); 186 ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1); 187 ad->ad_servernamelen = strlen(servername); 188 ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1); 189 190 if (ad->ad_fullname == NULL || ad->ad_servername == NULL) { 191 syslog(LOG_ERR, "authdes_seccreate: out of memory"); 192 goto failed; 193 } 194 if (timehost != NULL) { 195 ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1); 196 if (ad->ad_timehost == NULL) { 197 syslog(LOG_ERR, "authdes_seccreate: out of memory"); 198 goto failed; 199 } 200 memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1); 201 ad->ad_dosync = TRUE; 202 } else if (srvr != NULL) { 203 ad->ad_nis_srvr = srvr; /* transient */ 204 ad->ad_dosync = TRUE; 205 } else { 206 ad->ad_dosync = FALSE; 207 } 208 memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1); 209 memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1); 210 ad->ad_window = window; 211 if (ckey == NULL) { 212 if (key_gendes(&auth->ah_key) < 0) { 213 syslog(LOG_ERR, 214 "authdes_seccreate: keyserv(1m) is unable to generate session key"); 215 goto failed; 216 } 217 } else { 218 auth->ah_key = *ckey; 219 } 220 221 /* 222 * Set up auth handle 223 */ 224 auth->ah_cred.oa_flavor = AUTH_DES; 225 auth->ah_verf.oa_flavor = AUTH_DES; 226 auth->ah_ops = authdes_ops(); 227 auth->ah_private = (caddr_t)ad; 228 229 if (!authdes_refresh(auth, NULL)) { 230 goto failed; 231 } 232 ad->ad_nis_srvr = NULL; /* not needed any longer */ 233 return (auth); 234 235 failed: 236 if (auth) 237 FREE(auth, sizeof (AUTH)); 238 if (ad) { 239 if (ad->ad_fullname) 240 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 241 if (ad->ad_servername) 242 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 243 if (ad->ad_timehost) 244 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1); 245 if (ad->ad_netid) 246 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1); 247 if (ad->ad_uaddr) 248 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1); 249 FREE(ad, sizeof (struct ad_private)); 250 } 251 return (NULL); 252 } 253 254 /* 255 * Implement the five authentication operations 256 */ 257 258 259 /* 260 * 1. Next Verifier 261 */ 262 /*ARGSUSED*/ 263 static void 264 authdes_nextverf(AUTH *auth __unused) 265 { 266 /* what the heck am I supposed to do??? */ 267 } 268 269 270 /* 271 * 2. Marshal 272 */ 273 static bool_t 274 authdes_marshal(AUTH *auth, XDR *xdrs) 275 { 276 /* LINTED pointer alignment */ 277 struct ad_private *ad = AUTH_PRIVATE(auth); 278 struct authdes_cred *cred = &ad->ad_cred; 279 struct authdes_verf *verf = &ad->ad_verf; 280 des_block cryptbuf[2]; 281 des_block ivec; 282 int status; 283 int len; 284 rpc_inline_t *ixdr; 285 286 /* 287 * Figure out the "time", accounting for any time difference 288 * with the server if necessary. 289 */ 290 (void)gettimeofday(&ad->ad_timestamp, NULL); 291 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec; 292 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec; 293 while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) { 294 ad->ad_timestamp.tv_usec -= USEC_PER_SEC; 295 ad->ad_timestamp.tv_sec++; 296 } 297 298 /* 299 * XDR the timestamp and possibly some other things, then 300 * encrypt them. 301 */ 302 ixdr = (rpc_inline_t *)cryptbuf; 303 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec); 304 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec); 305 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 306 IXDR_PUT_U_INT32(ixdr, ad->ad_window); 307 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1); 308 ivec.key.high = ivec.key.low = 0; 309 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf, 310 (u_int) 2 * sizeof (des_block), 311 DES_ENCRYPT | DES_HW, (char *)&ivec); 312 } else { 313 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf, 314 (u_int) sizeof (des_block), 315 DES_ENCRYPT | DES_HW); 316 } 317 if (DES_FAILED(status)) { 318 syslog(LOG_ERR, "authdes_marshal: DES encryption failure"); 319 return (FALSE); 320 } 321 ad->ad_verf.adv_xtimestamp = cryptbuf[0]; 322 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 323 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high; 324 ad->ad_verf.adv_winverf = cryptbuf[1].key.low; 325 } else { 326 ad->ad_cred.adc_nickname = ad->ad_nickname; 327 ad->ad_verf.adv_winverf = 0; 328 } 329 330 /* 331 * Serialize the credential and verifier into opaque 332 * authentication data. 333 */ 334 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 335 len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen); 336 } else { 337 len = (1 + 1)*BYTES_PER_XDR_UNIT; 338 } 339 340 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) { 341 IXDR_PUT_INT32(ixdr, AUTH_DES); 342 IXDR_PUT_INT32(ixdr, len); 343 } else { 344 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor)); 345 ATTEMPT(xdr_putint32(xdrs, &len)); 346 } 347 ATTEMPT(xdr_authdes_cred(xdrs, cred)); 348 349 len = (2 + 1)*BYTES_PER_XDR_UNIT; 350 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) { 351 IXDR_PUT_INT32(ixdr, AUTH_DES); 352 IXDR_PUT_INT32(ixdr, len); 353 } else { 354 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor)); 355 ATTEMPT(xdr_putint32(xdrs, &len)); 356 } 357 ATTEMPT(xdr_authdes_verf(xdrs, verf)); 358 return (TRUE); 359 } 360 361 362 /* 363 * 3. Validate 364 */ 365 static bool_t 366 authdes_validate(AUTH *auth, struct opaque_auth *rverf) 367 { 368 /* LINTED pointer alignment */ 369 struct ad_private *ad = AUTH_PRIVATE(auth); 370 struct authdes_verf verf; 371 int status; 372 uint32_t *ixdr; 373 des_block buf; 374 375 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) { 376 return (FALSE); 377 } 378 /* LINTED pointer alignment */ 379 ixdr = (uint32_t *)rverf->oa_base; 380 buf.key.high = (uint32_t)*ixdr++; 381 buf.key.low = (uint32_t)*ixdr++; 382 verf.adv_int_u = (uint32_t)*ixdr++; 383 384 /* 385 * Decrypt the timestamp 386 */ 387 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf, 388 (u_int)sizeof (des_block), DES_DECRYPT | DES_HW); 389 390 if (DES_FAILED(status)) { 391 syslog(LOG_ERR, "authdes_validate: DES decryption failure"); 392 return (FALSE); 393 } 394 395 /* 396 * xdr the decrypted timestamp 397 */ 398 /* LINTED pointer alignment */ 399 ixdr = (uint32_t *)buf.c; 400 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1; 401 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr); 402 403 /* 404 * validate 405 */ 406 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp, 407 sizeof(struct timeval)) != 0) { 408 syslog(LOG_DEBUG, "authdes_validate: verifier mismatch"); 409 return (FALSE); 410 } 411 412 /* 413 * We have a nickname now, let's use it 414 */ 415 ad->ad_nickname = verf.adv_nickname; 416 ad->ad_cred.adc_namekind = ADN_NICKNAME; 417 return (TRUE); 418 } 419 420 /* 421 * 4. Refresh 422 */ 423 /*ARGSUSED*/ 424 static bool_t 425 authdes_refresh(AUTH *auth, void *dummy __unused) 426 { 427 /* LINTED pointer alignment */ 428 struct ad_private *ad = AUTH_PRIVATE(auth); 429 struct authdes_cred *cred = &ad->ad_cred; 430 int ok; 431 netobj pkey; 432 433 if (ad->ad_dosync) { 434 ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr, 435 ad->ad_timehost, &(ad->ad_uaddr), 436 &(ad->ad_netid)); 437 if (! ok) { 438 /* 439 * Hope the clocks are synced! 440 */ 441 ad->ad_dosync = 0; 442 syslog(LOG_DEBUG, 443 "authdes_refresh: unable to synchronize clock"); 444 } 445 } 446 ad->ad_xkey = auth->ah_key; 447 pkey.n_bytes = (char *)(ad->ad_pkey); 448 pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1; 449 if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) { 450 syslog(LOG_INFO, 451 "authdes_refresh: keyserv(1m) is unable to encrypt session key"); 452 return (FALSE); 453 } 454 cred->adc_fullname.key = ad->ad_xkey; 455 cred->adc_namekind = ADN_FULLNAME; 456 cred->adc_fullname.name = ad->ad_fullname; 457 return (TRUE); 458 } 459 460 461 /* 462 * 5. Destroy 463 */ 464 static void 465 authdes_destroy(AUTH *auth) 466 { 467 /* LINTED pointer alignment */ 468 struct ad_private *ad = AUTH_PRIVATE(auth); 469 470 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 471 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 472 if (ad->ad_timehost) 473 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1); 474 if (ad->ad_netid) 475 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1); 476 if (ad->ad_uaddr) 477 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1); 478 FREE(ad, sizeof (struct ad_private)); 479 FREE(auth, sizeof(AUTH)); 480 } 481 482 static struct auth_ops * 483 authdes_ops(void) 484 { 485 static struct auth_ops ops; 486 487 /* VARIABLES PROTECTED BY ops_lock: ops */ 488 489 mutex_lock(&authdes_ops_lock); 490 if (ops.ah_nextverf == NULL) { 491 ops.ah_nextverf = authdes_nextverf; 492 ops.ah_marshal = authdes_marshal; 493 ops.ah_validate = authdes_validate; 494 ops.ah_refresh = authdes_refresh; 495 ops.ah_destroy = authdes_destroy; 496 } 497 mutex_unlock(&authdes_ops_lock); 498 return (&ops); 499 } 500