1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 * 29 * @(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI 30 * $FreeBSD: src/lib/libc/rpc/auth_des.c,v 1.3 1999/08/28 00:00:32 peter Exp $ 31 * $DragonFly: src/lib/libc/rpc/auth_des.c,v 1.5 2005/11/13 12:27:04 swildner Exp $ 32 */ 33 /* 34 * Copyright (c) 1988 by Sun Microsystems, Inc. 35 */ 36 /* 37 * auth_des.c, client-side implementation of DES authentication 38 */ 39 #include <string.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 #include <sys/cdefs.h> 43 #include <rpc/des_crypt.h> 44 #include <rpc/types.h> 45 #include <rpc/xdr.h> 46 #include <rpc/auth.h> 47 #include <rpc/auth_des.h> 48 #include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */ 49 #include <sys/socket.h> 50 #undef NIS 51 #include <rpcsvc/nis.h> 52 53 extern bool_t __rpc_get_time_offset ( struct timeval *, nis_server *, 54 char *, char **, struct sockaddr_in * ); 55 extern int rtime ( struct sockaddr_in *, struct timeval *, struct timeval *); 56 extern bool_t xdr_authdes_cred ( XDR *, struct authdes_cred * ); 57 extern bool_t xdr_authdes_verf ( XDR *, struct authdes_verf * ); 58 59 #define MILLION 1000000L 60 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */ 61 62 #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private 63 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type)) 64 #define FREE(ptr, size) mem_free((char *)(ptr), (int) size) 65 #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE) 66 67 #define debug(msg) /*printf("%s\n", msg) */ 68 69 /* 70 * DES authenticator operations vector 71 */ 72 static void authdes_nextverf(); 73 static bool_t authdes_marshal(); 74 static bool_t authdes_validate(); 75 static bool_t authdes_refresh(); 76 static void authdes_destroy(); 77 static struct auth_ops authdes_ops = { 78 authdes_nextverf, 79 authdes_marshal, 80 authdes_validate, 81 authdes_refresh, 82 authdes_destroy 83 }; 84 #ifdef foo 85 static bool_t synchronize ( struct sockaddr *, struct timeval *); 86 #endif 87 /* 88 * This struct is pointed to by the ah_private field of an "AUTH *" 89 */ 90 struct ad_private { 91 char *ad_fullname; /* client's full name */ 92 u_int ad_fullnamelen; /* length of name, rounded up */ 93 char *ad_servername; /* server's full name */ 94 u_int ad_servernamelen; /* length of name, rounded up */ 95 u_int ad_window; /* client specified window */ 96 bool_t ad_dosync; /* synchronize? */ 97 struct sockaddr ad_syncaddr; /* remote host to synch with */ 98 char *ad_timehost; /* remote host to synch with */ 99 struct timeval ad_timediff; /* server's time - client's time */ 100 u_long ad_nickname; /* server's nickname for client */ 101 struct authdes_cred ad_cred; /* storage for credential */ 102 struct authdes_verf ad_verf; /* storage for verifier */ 103 struct timeval ad_timestamp; /* timestamp sent */ 104 des_block ad_xkey; /* encrypted conversation key */ 105 u_char ad_pkey[1024]; /* Server's actual public key */ 106 char *ad_netid; /* Timehost netid */ 107 char *ad_uaddr; /* Timehost uaddr */ 108 nis_server *ad_nis_srvr; /* NIS+ server struct */ 109 }; 110 111 112 /* 113 * Create the client des authentication object 114 */ 115 AUTH * 116 authdes_create(char *servername, /* network name of server */ 117 u_int window, /* time to live */ 118 struct sockaddr *syncaddr, /* optional addr of host to sync with */ 119 des_block *ckey) /* optional conversation key to use*/ 120 { 121 122 AUTH *auth; 123 struct ad_private *ad; 124 char namebuf[MAXNETNAMELEN+1]; 125 u_char pkey_data[1024]; 126 127 if (!getpublickey(servername, pkey_data)) 128 return(NULL); 129 130 /* 131 * Allocate everything now 132 */ 133 auth = ALLOC(AUTH); 134 ad = ALLOC(struct ad_private); 135 getnetname(namebuf); 136 137 ad->ad_fullnamelen = RNDUP(strlen(namebuf)); 138 ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1); 139 140 ad->ad_servernamelen = strlen(servername); 141 ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1); 142 143 if (auth == NULL || ad == NULL || ad->ad_fullname == NULL || 144 ad->ad_servername == NULL) { 145 debug("authdes_create: out of memory"); 146 goto failed; 147 } 148 149 /* 150 * Set up private data 151 */ 152 bcopy(namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1); 153 bcopy(servername, ad->ad_servername, ad->ad_servernamelen + 1); 154 bcopy(pkey_data, ad->ad_pkey, strlen(pkey_data) + 1); 155 if (syncaddr != NULL) { 156 ad->ad_syncaddr = *syncaddr; 157 ad->ad_dosync = TRUE; 158 } else { 159 ad->ad_dosync = FALSE; 160 } 161 ad->ad_window = window; 162 if (ckey == NULL) { 163 if (key_gendes(&auth->ah_key) < 0) { 164 debug("authdes_create: unable to gen conversation key"); 165 return (NULL); 166 } 167 } else { 168 auth->ah_key = *ckey; 169 } 170 171 /* 172 * Set up auth handle 173 */ 174 auth->ah_cred.oa_flavor = AUTH_DES; 175 auth->ah_verf.oa_flavor = AUTH_DES; 176 auth->ah_ops = &authdes_ops; 177 auth->ah_private = (caddr_t)ad; 178 179 if (!authdes_refresh(auth)) { 180 goto failed; 181 } 182 return (auth); 183 184 failed: 185 if (auth != NULL) 186 FREE(auth, sizeof(AUTH)); 187 if (ad != NULL) 188 FREE(ad, sizeof(struct ad_private)); 189 if (ad->ad_fullname != NULL) 190 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 191 if (ad->ad_servername != NULL) 192 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 193 return (NULL); 194 } 195 196 /* 197 * Slightly modified version of authdes_create which takes the public key 198 * of the server principal as an argument. This spares us a call to 199 * getpublickey() which in the nameserver context can cause a deadlock. 200 */ 201 AUTH * 202 authdes_pk_create(char *servername, /* network name of server */ 203 netobj *pkey, /* public key of server */ 204 u_int window, /* time to live */ 205 char *timehost, /* optional hostname to sync with */ 206 des_block *ckey, /* optional conversation key to use */ 207 nis_server *srvr) /* optional NIS+ server struct */ 208 { 209 AUTH *auth; 210 struct ad_private *ad; 211 char namebuf[MAXNETNAMELEN+1]; 212 213 /* 214 * Allocate everything now 215 */ 216 auth = ALLOC(AUTH); 217 if (auth == NULL) { 218 debug("authdes_pk_create: out of memory"); 219 return (NULL); 220 } 221 ad = ALLOC(struct ad_private); 222 if (ad == NULL) { 223 debug("authdes_pk_create: out of memory"); 224 goto failed; 225 } 226 ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */ 227 ad->ad_timehost = NULL; 228 ad->ad_netid = NULL; 229 ad->ad_uaddr = NULL; 230 ad->ad_nis_srvr = NULL; 231 ad->ad_timediff.tv_sec = 0; 232 ad->ad_timediff.tv_usec = 0; 233 memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len); 234 if (!getnetname(namebuf)) 235 goto failed; 236 ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf)); 237 ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1); 238 ad->ad_servernamelen = strlen(servername); 239 ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1); 240 241 if (ad->ad_fullname == NULL || ad->ad_servername == NULL) { 242 debug("authdes_pk_create: out of memory"); 243 goto failed; 244 } 245 if (timehost != NULL) { 246 ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1); 247 if (ad->ad_timehost == NULL) { 248 debug("authdes_pk_create: out of memory"); 249 goto failed; 250 } 251 memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1); 252 ad->ad_dosync = TRUE; 253 } else if (srvr != NULL) { 254 ad->ad_nis_srvr = srvr; /* transient */ 255 ad->ad_dosync = TRUE; 256 } else { 257 ad->ad_dosync = FALSE; 258 } 259 memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1); 260 memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1); 261 ad->ad_window = window; 262 if (ckey == NULL) { 263 if (key_gendes(&auth->ah_key) < 0) { 264 debug("authdes_pk_create: unable to gen conversation key"); 265 goto failed; 266 } 267 } else { 268 auth->ah_key = *ckey; 269 } 270 271 /* 272 * Set up auth handle 273 */ 274 auth->ah_cred.oa_flavor = AUTH_DES; 275 auth->ah_verf.oa_flavor = AUTH_DES; 276 auth->ah_ops = &authdes_ops; 277 auth->ah_private = (caddr_t)ad; 278 279 if (!authdes_refresh(auth)) { 280 goto failed; 281 } 282 ad->ad_nis_srvr = NULL; /* not needed any longer */ 283 return (auth); 284 285 failed: 286 if (auth) 287 FREE(auth, sizeof (AUTH)); 288 if (ad) { 289 if (ad->ad_fullname) 290 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 291 if (ad->ad_servername) 292 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 293 if (ad->ad_timehost) 294 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1); 295 if (ad->ad_netid) 296 free(ad->ad_netid); 297 if (ad->ad_uaddr) 298 free(ad->ad_uaddr); 299 FREE(ad, sizeof (struct ad_private)); 300 } 301 return (NULL); 302 } 303 /* 304 * Implement the five authentication operations 305 */ 306 307 308 /* 309 * 1. Next Verifier 310 */ 311 /*ARGSUSED*/ 312 static void 313 authdes_nextverf(AUTH *auth) 314 { 315 /* what the heck am I supposed to do??? */ 316 } 317 318 319 320 /* 321 * 2. Marshal 322 */ 323 static bool_t 324 authdes_marshal(AUTH *auth, XDR *xdrs) 325 { 326 struct ad_private *ad = AUTH_PRIVATE(auth); 327 struct authdes_cred *cred = &ad->ad_cred; 328 struct authdes_verf *verf = &ad->ad_verf; 329 des_block cryptbuf[2]; 330 des_block ivec; 331 int status; 332 long len; 333 int32_t *ixdr; 334 335 /* 336 * Figure out the "time", accounting for any time difference 337 * with the server if necessary. 338 */ 339 gettimeofday(&ad->ad_timestamp, (struct timezone *)NULL); 340 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec; 341 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec; 342 if (ad->ad_timestamp.tv_usec >= MILLION) { 343 ad->ad_timestamp.tv_usec -= MILLION; 344 ad->ad_timestamp.tv_sec += 1; 345 } 346 347 /* 348 * XDR the timestamp and possibly some other things, then 349 * encrypt them. 350 */ 351 ixdr = (int32_t *)cryptbuf; 352 IXDR_PUT_LONG(ixdr, ad->ad_timestamp.tv_sec); 353 IXDR_PUT_LONG(ixdr, ad->ad_timestamp.tv_usec); 354 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 355 IXDR_PUT_U_LONG(ixdr, ad->ad_window); 356 IXDR_PUT_U_LONG(ixdr, ad->ad_window - 1); 357 ivec.key.high = ivec.key.low = 0; 358 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf, 359 2*sizeof(des_block), DES_ENCRYPT | DES_HW, (char *)&ivec); 360 } else { 361 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf, 362 sizeof(des_block), DES_ENCRYPT | DES_HW); 363 } 364 if (DES_FAILED(status)) { 365 debug("authdes_marshal: DES encryption failure"); 366 return (FALSE); 367 } 368 ad->ad_verf.adv_xtimestamp = cryptbuf[0]; 369 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 370 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high; 371 ad->ad_verf.adv_winverf = cryptbuf[1].key.low; 372 } else { 373 ad->ad_cred.adc_nickname = ad->ad_nickname; 374 ad->ad_verf.adv_winverf = 0; 375 } 376 377 /* 378 * Serialize the credential and verifier into opaque 379 * authentication data. 380 */ 381 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 382 len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen); 383 } else { 384 len = (1 + 1)*BYTES_PER_XDR_UNIT; 385 } 386 387 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) { 388 IXDR_PUT_LONG(ixdr, AUTH_DES); 389 IXDR_PUT_LONG(ixdr, len); 390 } else { 391 ATTEMPT(xdr_putlong(xdrs, (long *)&auth->ah_cred.oa_flavor)); 392 ATTEMPT(xdr_putlong(xdrs, &len)); 393 } 394 ATTEMPT(xdr_authdes_cred(xdrs, cred)); 395 396 len = (2 + 1)*BYTES_PER_XDR_UNIT; 397 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) { 398 IXDR_PUT_LONG(ixdr, AUTH_DES); 399 IXDR_PUT_LONG(ixdr, len); 400 } else { 401 ATTEMPT(xdr_putlong(xdrs, (long *)&auth->ah_verf.oa_flavor)); 402 ATTEMPT(xdr_putlong(xdrs, &len)); 403 } 404 ATTEMPT(xdr_authdes_verf(xdrs, verf)); 405 return (TRUE); 406 } 407 408 409 /* 410 * 3. Validate 411 */ 412 static bool_t 413 authdes_validate(AUTH *auth, struct opaque_auth *rverf) 414 { 415 struct ad_private *ad = AUTH_PRIVATE(auth); 416 struct authdes_verf verf; 417 int status; 418 u_long *ixdr; 419 420 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) { 421 return (FALSE); 422 } 423 ixdr = (u_long *)rverf->oa_base; 424 verf.adv_xtimestamp.key.high = (u_long)*ixdr++; 425 verf.adv_xtimestamp.key.low = (u_long)*ixdr++; 426 verf.adv_int_u = (u_long)*ixdr++; /* nickname not XDR'd ! */ 427 428 /* 429 * Decrypt the timestamp 430 */ 431 status = ecb_crypt((char *)&auth->ah_key, (char *)&verf.adv_xtimestamp, 432 sizeof(des_block), DES_DECRYPT | DES_HW); 433 434 if (DES_FAILED(status)) { 435 debug("authdes_validate: DES decryption failure"); 436 return (FALSE); 437 } 438 439 /* 440 * xdr the decrypted timestamp 441 */ 442 ixdr = (u_long *)verf.adv_xtimestamp.c; 443 verf.adv_timestamp.tv_sec = IXDR_GET_LONG(ixdr) + 1; 444 verf.adv_timestamp.tv_usec = IXDR_GET_LONG(ixdr); 445 446 /* 447 * validate 448 */ 449 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp, 450 sizeof(struct timeval)) != 0) { 451 debug("authdes_validate: verifier mismatch\n"); 452 return (FALSE); 453 } 454 455 /* 456 * We have a nickname now, let's use it 457 */ 458 ad->ad_nickname = verf.adv_nickname; 459 ad->ad_cred.adc_namekind = ADN_NICKNAME; 460 return (TRUE); 461 } 462 463 /* 464 * 4. Refresh 465 */ 466 static bool_t 467 authdes_refresh(AUTH *auth) 468 { 469 struct ad_private *ad = AUTH_PRIVATE(auth); 470 struct authdes_cred *cred = &ad->ad_cred; 471 netobj pkey; 472 473 if (ad->ad_dosync && 474 #ifdef old 475 !synchronize(&ad->ad_syncaddr, &ad->ad_timediff)) { 476 #else 477 !__rpc_get_time_offset(&ad->ad_timediff,ad->ad_nis_srvr, 478 ad->ad_timehost, &(ad->ad_uaddr), 479 (struct sockaddr_in *)&(ad->ad_syncaddr))) { 480 #endif 481 /* 482 * Hope the clocks are synced! 483 */ 484 ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0; 485 ad->ad_dosync = 0; 486 debug("authdes_refresh: unable to synchronize with server"); 487 } 488 ad->ad_xkey = auth->ah_key; 489 pkey.n_bytes = (char *)(ad->ad_pkey); 490 pkey.n_len = strlen((char *)ad->ad_pkey) + 1; 491 if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) { 492 debug("authdes_create: unable to encrypt conversation key"); 493 return (FALSE); 494 } 495 cred->adc_fullname.key = ad->ad_xkey; 496 cred->adc_namekind = ADN_FULLNAME; 497 cred->adc_fullname.name = ad->ad_fullname; 498 return (TRUE); 499 } 500 501 502 /* 503 * 5. Destroy 504 */ 505 static void 506 authdes_destroy(AUTH *auth) 507 { 508 struct ad_private *ad = AUTH_PRIVATE(auth); 509 510 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 511 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 512 FREE(ad, sizeof(struct ad_private)); 513 FREE(auth, sizeof(AUTH)); 514 } 515 516 517 #ifdef old 518 /* 519 * Synchronize with the server at the given address, that is, 520 * adjust timep to reflect the delta between our clocks 521 */ 522 static bool_t 523 synchronize(struct sockaddr *syncaddr, struct timeval *timep) 524 { 525 struct timeval mytime; 526 struct timeval timeout; 527 528 timeout.tv_sec = RTIME_TIMEOUT; 529 timeout.tv_usec = 0; 530 if (rtime((struct sockaddr_in *)syncaddr, timep, NULL /*&timeout*/) < 0) { 531 return (FALSE); 532 } 533 gettimeofday(&mytime, (struct timezone *)NULL); 534 timep->tv_sec -= mytime.tv_sec; 535 if (mytime.tv_usec > timep->tv_usec) { 536 timep->tv_sec -= 1; 537 timep->tv_usec += MILLION; 538 } 539 timep->tv_usec -= mytime.tv_usec; 540 return (TRUE); 541 } 542 #endif 543