1 /*- 2 * Copyright (c) 2009, Sun Microsystems, Inc. 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 are met: 7 * - Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * - Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * - Neither the name of Sun Microsystems, Inc. nor the names of its 13 * contributors may be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 * 28 * @(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI 29 * $FreeBSD: src/lib/libc/rpc/auth_des.c,v 1.10 2006/02/27 22:10:58 deischen Exp $ 30 */ 31 /* 32 * Copyright (c) 1988 by Sun Microsystems, Inc. 33 */ 34 /* 35 * auth_des.c, client-side implementation of DES authentication 36 */ 37 38 #include "namespace.h" 39 #include "reentrant.h" 40 #include <err.h> 41 #include <errno.h> 42 #include <string.h> 43 #include <stdlib.h> 44 #include <unistd.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 #define USEC_PER_SEC 1000000 59 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */ 60 61 #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private 62 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type)) 63 #define FREE(ptr, size) mem_free((char *)(ptr), (int) size) 64 #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE) 65 66 extern bool_t xdr_authdes_cred(XDR *, struct authdes_cred *); 67 extern bool_t xdr_authdes_verf(XDR *, struct authdes_verf *); 68 extern int key_encryptsession_pk(char *, netobj *, des_block *); 69 70 extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *, 71 char **, char **); 72 73 74 /* 75 * DES authenticator operations vector 76 */ 77 static void authdes_nextverf(AUTH *); 78 static bool_t authdes_marshal(AUTH *, XDR *); 79 static bool_t authdes_validate(AUTH *, struct opaque_auth *); 80 static bool_t authdes_refresh(AUTH *, void *); 81 static void authdes_destroy(AUTH *); 82 83 static struct auth_ops *authdes_ops(void); 84 85 /* 86 * This struct is pointed to by the ah_private field of an "AUTH *" 87 */ 88 struct ad_private { 89 char *ad_fullname; /* client's full name */ 90 u_int ad_fullnamelen; /* length of name, rounded up */ 91 char *ad_servername; /* server's full name */ 92 u_int ad_servernamelen; /* length of name, rounded up */ 93 u_int ad_window; /* client specified window */ 94 bool_t ad_dosync; /* synchronize? */ 95 struct netbuf ad_syncaddr; /* remote host to synch with */ 96 char *ad_timehost; /* remote host to synch with */ 97 struct timeval ad_timediff; /* server's time - client's time */ 98 u_int ad_nickname; /* server's nickname for client */ 99 struct authdes_cred ad_cred; /* storage for credential */ 100 struct authdes_verf ad_verf; /* storage for verifier */ 101 struct timeval ad_timestamp; /* timestamp sent */ 102 des_block ad_xkey; /* encrypted conversation key */ 103 u_char ad_pkey[1024]; /* Server's actual public key */ 104 char *ad_netid; /* Timehost netid */ 105 char *ad_uaddr; /* Timehost uaddr */ 106 nis_server *ad_nis_srvr; /* NIS+ server struct */ 107 }; 108 109 AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *, 110 const des_block *, nis_server *); 111 /* 112 * documented version of authdes_seccreate 113 */ 114 /* 115 servername: network name of server 116 win: time to live 117 timehost: optional hostname to sync with 118 ckey: optional conversation key to use 119 */ 120 121 AUTH * 122 authdes_seccreate(const char *servername, const u_int win, 123 const char *timehost, const des_block *ckey) 124 { 125 u_char pkey_data[1024]; 126 netobj pkey; 127 AUTH *dummy; 128 129 if (! getpublickey(servername, (char *) pkey_data)) { 130 syslog(LOG_ERR, 131 "authdes_seccreate: no public key found for %s", 132 servername); 133 return (NULL); 134 } 135 136 pkey.n_bytes = (char *) pkey_data; 137 pkey.n_len = (u_int)strlen((char *)pkey_data) + 1; 138 dummy = authdes_pk_seccreate(servername, &pkey, win, timehost, 139 ckey, NULL); 140 return (dummy); 141 } 142 143 /* 144 * Slightly modified version of authdessec_create which takes the public key 145 * of the server principal as an argument. This spares us a call to 146 * getpublickey() which in the nameserver context can cause a deadlock. 147 */ 148 AUTH * 149 authdes_pk_seccreate(const char *servername, netobj *pkey, u_int window, 150 const char *timehost, const des_block *ckey, 151 nis_server *srvr) 152 { 153 AUTH *auth; 154 struct ad_private *ad; 155 char namebuf[MAXNETNAMELEN+1]; 156 157 /* 158 * Allocate everything now 159 */ 160 auth = ALLOC(AUTH); 161 if (auth == NULL) { 162 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory"); 163 return (NULL); 164 } 165 ad = ALLOC(struct ad_private); 166 if (ad == NULL) { 167 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory"); 168 goto failed; 169 } 170 ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */ 171 ad->ad_timehost = NULL; 172 ad->ad_netid = NULL; 173 ad->ad_uaddr = NULL; 174 ad->ad_nis_srvr = NULL; 175 ad->ad_timediff.tv_sec = 0; 176 ad->ad_timediff.tv_usec = 0; 177 memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len); 178 if (!getnetname(namebuf)) 179 goto failed; 180 ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf)); 181 ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1); 182 ad->ad_servernamelen = strlen(servername); 183 ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1); 184 185 if (ad->ad_fullname == NULL || ad->ad_servername == NULL) { 186 syslog(LOG_ERR, "authdes_seccreate: out of memory"); 187 goto failed; 188 } 189 if (timehost != NULL) { 190 ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1); 191 if (ad->ad_timehost == NULL) { 192 syslog(LOG_ERR, "authdes_seccreate: out of memory"); 193 goto failed; 194 } 195 memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1); 196 ad->ad_dosync = TRUE; 197 } else if (srvr != NULL) { 198 ad->ad_nis_srvr = srvr; /* transient */ 199 ad->ad_dosync = TRUE; 200 } else { 201 ad->ad_dosync = FALSE; 202 } 203 memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1); 204 memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1); 205 ad->ad_window = window; 206 if (ckey == NULL) { 207 if (key_gendes(&auth->ah_key) < 0) { 208 syslog(LOG_ERR, 209 "authdes_seccreate: keyserv(1m) is unable to generate session key"); 210 goto failed; 211 } 212 } else { 213 auth->ah_key = *ckey; 214 } 215 216 /* 217 * Set up auth handle 218 */ 219 auth->ah_cred.oa_flavor = AUTH_DES; 220 auth->ah_verf.oa_flavor = AUTH_DES; 221 auth->ah_ops = authdes_ops(); 222 auth->ah_private = (caddr_t)ad; 223 224 if (!authdes_refresh(auth, NULL)) { 225 goto failed; 226 } 227 ad->ad_nis_srvr = NULL; /* not needed any longer */ 228 return (auth); 229 230 failed: 231 if (auth) 232 FREE(auth, sizeof (AUTH)); 233 if (ad) { 234 if (ad->ad_fullname) 235 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 236 if (ad->ad_servername) 237 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 238 if (ad->ad_timehost) 239 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1); 240 if (ad->ad_netid) 241 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1); 242 if (ad->ad_uaddr) 243 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1); 244 FREE(ad, sizeof (struct ad_private)); 245 } 246 return (NULL); 247 } 248 249 /* 250 * Implement the five authentication operations 251 */ 252 253 254 /* 255 * 1. Next Verifier 256 */ 257 /*ARGSUSED*/ 258 static void 259 authdes_nextverf(AUTH *auth __unused) 260 { 261 /* what the heck am I supposed to do??? */ 262 } 263 264 265 /* 266 * 2. Marshal 267 */ 268 static bool_t 269 authdes_marshal(AUTH *auth, XDR *xdrs) 270 { 271 /* LINTED pointer alignment */ 272 struct ad_private *ad = AUTH_PRIVATE(auth); 273 struct authdes_cred *cred = &ad->ad_cred; 274 struct authdes_verf *verf = &ad->ad_verf; 275 des_block cryptbuf[2]; 276 des_block ivec; 277 int status; 278 int len; 279 rpc_inline_t *ixdr; 280 281 /* 282 * Figure out the "time", accounting for any time difference 283 * with the server if necessary. 284 */ 285 gettimeofday(&ad->ad_timestamp, NULL); 286 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec; 287 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec; 288 while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) { 289 ad->ad_timestamp.tv_usec -= USEC_PER_SEC; 290 ad->ad_timestamp.tv_sec++; 291 } 292 293 /* 294 * XDR the timestamp and possibly some other things, then 295 * encrypt them. 296 */ 297 ixdr = (rpc_inline_t *)cryptbuf; 298 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec); 299 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec); 300 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 301 IXDR_PUT_U_INT32(ixdr, ad->ad_window); 302 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1); 303 ivec.key.high = ivec.key.low = 0; 304 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf, 305 (u_int) 2 * sizeof (des_block), 306 DES_ENCRYPT | DES_HW, (char *)&ivec); 307 } else { 308 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf, 309 (u_int) sizeof (des_block), 310 DES_ENCRYPT | DES_HW); 311 } 312 if (DES_FAILED(status)) { 313 syslog(LOG_ERR, "authdes_marshal: DES encryption failure"); 314 return (FALSE); 315 } 316 ad->ad_verf.adv_xtimestamp = cryptbuf[0]; 317 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 318 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high; 319 ad->ad_verf.adv_winverf = cryptbuf[1].key.low; 320 } else { 321 ad->ad_cred.adc_nickname = ad->ad_nickname; 322 ad->ad_verf.adv_winverf = 0; 323 } 324 325 /* 326 * Serialize the credential and verifier into opaque 327 * authentication data. 328 */ 329 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 330 len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen); 331 } else { 332 len = (1 + 1)*BYTES_PER_XDR_UNIT; 333 } 334 335 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) { 336 IXDR_PUT_INT32(ixdr, AUTH_DES); 337 IXDR_PUT_INT32(ixdr, len); 338 } else { 339 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor)); 340 ATTEMPT(xdr_putint32(xdrs, &len)); 341 } 342 ATTEMPT(xdr_authdes_cred(xdrs, cred)); 343 344 len = (2 + 1)*BYTES_PER_XDR_UNIT; 345 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) { 346 IXDR_PUT_INT32(ixdr, AUTH_DES); 347 IXDR_PUT_INT32(ixdr, len); 348 } else { 349 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor)); 350 ATTEMPT(xdr_putint32(xdrs, &len)); 351 } 352 ATTEMPT(xdr_authdes_verf(xdrs, verf)); 353 return (TRUE); 354 } 355 356 357 /* 358 * 3. Validate 359 */ 360 static bool_t 361 authdes_validate(AUTH *auth, struct opaque_auth *rverf) 362 { 363 /* LINTED pointer alignment */ 364 struct ad_private *ad = AUTH_PRIVATE(auth); 365 struct authdes_verf verf; 366 int status; 367 uint32_t *ixdr; 368 des_block buf; 369 370 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) { 371 return (FALSE); 372 } 373 /* LINTED pointer alignment */ 374 ixdr = (uint32_t *)rverf->oa_base; 375 buf.key.high = (uint32_t)*ixdr++; 376 buf.key.low = (uint32_t)*ixdr++; 377 verf.adv_int_u = (uint32_t)*ixdr++; 378 379 /* 380 * Decrypt the timestamp 381 */ 382 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf, 383 (u_int)sizeof (des_block), DES_DECRYPT | DES_HW); 384 385 if (DES_FAILED(status)) { 386 syslog(LOG_ERR, "authdes_validate: DES decryption failure"); 387 return (FALSE); 388 } 389 390 /* 391 * xdr the decrypted timestamp 392 */ 393 /* LINTED pointer alignment */ 394 ixdr = (uint32_t *)buf.c; 395 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1; 396 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr); 397 398 /* 399 * validate 400 */ 401 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp, 402 sizeof(struct timeval)) != 0) { 403 syslog(LOG_DEBUG, "authdes_validate: verifier mismatch"); 404 return (FALSE); 405 } 406 407 /* 408 * We have a nickname now, let's use it 409 */ 410 ad->ad_nickname = verf.adv_nickname; 411 ad->ad_cred.adc_namekind = ADN_NICKNAME; 412 return (TRUE); 413 } 414 415 /* 416 * 4. Refresh 417 */ 418 /*ARGSUSED*/ 419 static bool_t 420 authdes_refresh(AUTH *auth, void *dummy __unused) 421 { 422 /* LINTED pointer alignment */ 423 struct ad_private *ad = AUTH_PRIVATE(auth); 424 struct authdes_cred *cred = &ad->ad_cred; 425 int ok; 426 netobj pkey; 427 428 if (ad->ad_dosync) { 429 ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr, 430 ad->ad_timehost, &(ad->ad_uaddr), 431 &(ad->ad_netid)); 432 if (! ok) { 433 /* 434 * Hope the clocks are synced! 435 */ 436 ad->ad_dosync = 0; 437 syslog(LOG_DEBUG, 438 "authdes_refresh: unable to synchronize clock"); 439 } 440 } 441 ad->ad_xkey = auth->ah_key; 442 pkey.n_bytes = (char *)(ad->ad_pkey); 443 pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1; 444 if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) { 445 syslog(LOG_INFO, 446 "authdes_refresh: keyserv(1m) is unable to encrypt session key"); 447 return (FALSE); 448 } 449 cred->adc_fullname.key = ad->ad_xkey; 450 cred->adc_namekind = ADN_FULLNAME; 451 cred->adc_fullname.name = ad->ad_fullname; 452 return (TRUE); 453 } 454 455 456 /* 457 * 5. Destroy 458 */ 459 static void 460 authdes_destroy(AUTH *auth) 461 { 462 /* LINTED pointer alignment */ 463 struct ad_private *ad = AUTH_PRIVATE(auth); 464 465 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 466 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 467 if (ad->ad_timehost) 468 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1); 469 if (ad->ad_netid) 470 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1); 471 if (ad->ad_uaddr) 472 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1); 473 FREE(ad, sizeof(struct ad_private)); 474 FREE(auth, sizeof(AUTH)); 475 } 476 477 static struct auth_ops * 478 authdes_ops(void) 479 { 480 static struct auth_ops ops; 481 482 /* VARIABLES PROTECTED BY ops_lock: ops */ 483 484 mutex_lock(&authdes_ops_lock); 485 if (ops.ah_nextverf == NULL) { 486 ops.ah_nextverf = authdes_nextverf; 487 ops.ah_marshal = authdes_marshal; 488 ops.ah_validate = authdes_validate; 489 ops.ah_refresh = authdes_refresh; 490 ops.ah_destroy = authdes_destroy; 491 } 492 mutex_unlock(&authdes_ops_lock); 493 return (&ops); 494 } 495