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 1.10 2006/02/27 22:10:58 deischen 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 40 #include "namespace.h" 41 #include "reentrant.h" 42 #include <err.h> 43 #include <errno.h> 44 #include <string.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 #include <sys/cdefs.h> 48 #include <rpc/des_crypt.h> 49 #include <syslog.h> 50 #include <rpc/types.h> 51 #include <rpc/auth.h> 52 #include <rpc/auth_des.h> 53 #include <rpc/clnt.h> 54 #include <rpc/xdr.h> 55 #include <sys/socket.h> 56 #undef NIS 57 #include <rpcsvc/nis.h> 58 #include "un-namespace.h" 59 #include "mt_misc.h" 60 61 #define USEC_PER_SEC 1000000 62 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */ 63 64 #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private 65 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type)) 66 #define FREE(ptr, size) mem_free((char *)(ptr), (int) size) 67 #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE) 68 69 extern bool_t xdr_authdes_cred(XDR *, struct authdes_cred *); 70 extern bool_t xdr_authdes_verf(XDR *, struct authdes_verf *); 71 72 extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *, 73 char **, char **); 74 75 76 /* 77 * DES authenticator operations vector 78 */ 79 static void authdes_nextverf(AUTH *); 80 static bool_t authdes_marshal(AUTH *, XDR *); 81 static bool_t authdes_validate(AUTH *, struct opaque_auth *); 82 static bool_t authdes_refresh(AUTH *, void *); 83 static void authdes_destroy(AUTH *); 84 85 static struct auth_ops *authdes_ops(void); 86 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 netbuf 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_int 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 AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *, 112 const des_block *, nis_server *); 113 /* 114 * documented version of authdes_seccreate 115 */ 116 /* 117 servername: network name of server 118 win: time to live 119 timehost: optional hostname to sync with 120 ckey: optional conversation key to use 121 */ 122 123 AUTH * 124 authdes_seccreate(const char *servername, const u_int win, 125 const char *timehost, const des_block *ckey) 126 { 127 u_char pkey_data[1024]; 128 netobj pkey; 129 AUTH *dummy; 130 131 if (! getpublickey(servername, (char *) pkey_data)) { 132 syslog(LOG_ERR, 133 "authdes_seccreate: no public key found for %s", 134 servername); 135 return (NULL); 136 } 137 138 pkey.n_bytes = (char *) pkey_data; 139 pkey.n_len = (u_int)strlen((char *)pkey_data) + 1; 140 dummy = authdes_pk_seccreate(servername, &pkey, win, timehost, 141 ckey, NULL); 142 return (dummy); 143 } 144 145 /* 146 * Slightly modified version of authdessec_create which takes the public key 147 * of the server principal as an argument. This spares us a call to 148 * getpublickey() which in the nameserver context can cause a deadlock. 149 */ 150 AUTH * 151 authdes_pk_seccreate(const char *servername, netobj *pkey, u_int window, 152 const char *timehost, const des_block *ckey, 153 nis_server *srvr) 154 { 155 AUTH *auth; 156 struct ad_private *ad; 157 char namebuf[MAXNETNAMELEN+1]; 158 159 /* 160 * Allocate everything now 161 */ 162 auth = ALLOC(AUTH); 163 if (auth == NULL) { 164 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory"); 165 return (NULL); 166 } 167 ad = ALLOC(struct ad_private); 168 if (ad == NULL) { 169 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory"); 170 goto failed; 171 } 172 ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */ 173 ad->ad_timehost = NULL; 174 ad->ad_netid = NULL; 175 ad->ad_uaddr = NULL; 176 ad->ad_nis_srvr = NULL; 177 ad->ad_timediff.tv_sec = 0; 178 ad->ad_timediff.tv_usec = 0; 179 memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len); 180 if (!getnetname(namebuf)) 181 goto failed; 182 ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf)); 183 ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1); 184 ad->ad_servernamelen = strlen(servername); 185 ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1); 186 187 if (ad->ad_fullname == NULL || ad->ad_servername == NULL) { 188 syslog(LOG_ERR, "authdes_seccreate: out of memory"); 189 goto failed; 190 } 191 if (timehost != NULL) { 192 ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1); 193 if (ad->ad_timehost == NULL) { 194 syslog(LOG_ERR, "authdes_seccreate: out of memory"); 195 goto failed; 196 } 197 memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1); 198 ad->ad_dosync = TRUE; 199 } else if (srvr != NULL) { 200 ad->ad_nis_srvr = srvr; /* transient */ 201 ad->ad_dosync = TRUE; 202 } else { 203 ad->ad_dosync = FALSE; 204 } 205 memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1); 206 memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1); 207 ad->ad_window = window; 208 if (ckey == NULL) { 209 if (key_gendes(&auth->ah_key) < 0) { 210 syslog(LOG_ERR, 211 "authdes_seccreate: keyserv(1m) is unable to generate session key"); 212 goto failed; 213 } 214 } else { 215 auth->ah_key = *ckey; 216 } 217 218 /* 219 * Set up auth handle 220 */ 221 auth->ah_cred.oa_flavor = AUTH_DES; 222 auth->ah_verf.oa_flavor = AUTH_DES; 223 auth->ah_ops = authdes_ops(); 224 auth->ah_private = (caddr_t)ad; 225 226 if (!authdes_refresh(auth, NULL)) { 227 goto failed; 228 } 229 ad->ad_nis_srvr = NULL; /* not needed any longer */ 230 return (auth); 231 232 failed: 233 if (auth) 234 FREE(auth, sizeof (AUTH)); 235 if (ad) { 236 if (ad->ad_fullname) 237 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 238 if (ad->ad_servername) 239 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 240 if (ad->ad_timehost) 241 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1); 242 if (ad->ad_netid) 243 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1); 244 if (ad->ad_uaddr) 245 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1); 246 FREE(ad, sizeof (struct ad_private)); 247 } 248 return (NULL); 249 } 250 251 /* 252 * Implement the five authentication operations 253 */ 254 255 256 /* 257 * 1. Next Verifier 258 */ 259 /*ARGSUSED*/ 260 static void 261 authdes_nextverf(AUTH *auth) 262 { 263 /* what the heck am I supposed to do??? */ 264 } 265 266 267 /* 268 * 2. Marshal 269 */ 270 static bool_t 271 authdes_marshal(AUTH *auth, XDR *xdrs) 272 { 273 /* LINTED pointer alignment */ 274 struct ad_private *ad = AUTH_PRIVATE(auth); 275 struct authdes_cred *cred = &ad->ad_cred; 276 struct authdes_verf *verf = &ad->ad_verf; 277 des_block cryptbuf[2]; 278 des_block ivec; 279 int status; 280 int len; 281 rpc_inline_t *ixdr; 282 283 /* 284 * Figure out the "time", accounting for any time difference 285 * with the server if necessary. 286 */ 287 gettimeofday(&ad->ad_timestamp, NULL); 288 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec; 289 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec; 290 while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) { 291 ad->ad_timestamp.tv_usec -= USEC_PER_SEC; 292 ad->ad_timestamp.tv_sec++; 293 } 294 295 /* 296 * XDR the timestamp and possibly some other things, then 297 * encrypt them. 298 */ 299 ixdr = (rpc_inline_t *)cryptbuf; 300 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec); 301 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec); 302 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 303 IXDR_PUT_U_INT32(ixdr, ad->ad_window); 304 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1); 305 ivec.key.high = ivec.key.low = 0; 306 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf, 307 (u_int) 2 * sizeof (des_block), 308 DES_ENCRYPT | DES_HW, (char *)&ivec); 309 } else { 310 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf, 311 (u_int) sizeof (des_block), 312 DES_ENCRYPT | DES_HW); 313 } 314 if (DES_FAILED(status)) { 315 syslog(LOG_ERR, "authdes_marshal: DES encryption failure"); 316 return (FALSE); 317 } 318 ad->ad_verf.adv_xtimestamp = cryptbuf[0]; 319 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 320 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high; 321 ad->ad_verf.adv_winverf = cryptbuf[1].key.low; 322 } else { 323 ad->ad_cred.adc_nickname = ad->ad_nickname; 324 ad->ad_verf.adv_winverf = 0; 325 } 326 327 /* 328 * Serialize the credential and verifier into opaque 329 * authentication data. 330 */ 331 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 332 len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen); 333 } else { 334 len = (1 + 1)*BYTES_PER_XDR_UNIT; 335 } 336 337 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) { 338 IXDR_PUT_INT32(ixdr, AUTH_DES); 339 IXDR_PUT_INT32(ixdr, len); 340 } else { 341 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor)); 342 ATTEMPT(xdr_putint32(xdrs, &len)); 343 } 344 ATTEMPT(xdr_authdes_cred(xdrs, cred)); 345 346 len = (2 + 1)*BYTES_PER_XDR_UNIT; 347 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) { 348 IXDR_PUT_INT32(ixdr, AUTH_DES); 349 IXDR_PUT_INT32(ixdr, len); 350 } else { 351 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor)); 352 ATTEMPT(xdr_putint32(xdrs, &len)); 353 } 354 ATTEMPT(xdr_authdes_verf(xdrs, verf)); 355 return (TRUE); 356 } 357 358 359 /* 360 * 3. Validate 361 */ 362 static bool_t 363 authdes_validate(AUTH *auth, struct opaque_auth *rverf) 364 { 365 /* LINTED pointer alignment */ 366 struct ad_private *ad = AUTH_PRIVATE(auth); 367 struct authdes_verf verf; 368 int status; 369 uint32_t *ixdr; 370 des_block buf; 371 372 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) { 373 return (FALSE); 374 } 375 /* LINTED pointer alignment */ 376 ixdr = (uint32_t *)rverf->oa_base; 377 buf.key.high = (uint32_t)*ixdr++; 378 buf.key.low = (uint32_t)*ixdr++; 379 verf.adv_int_u = (uint32_t)*ixdr++; 380 381 /* 382 * Decrypt the timestamp 383 */ 384 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf, 385 (u_int)sizeof (des_block), DES_DECRYPT | DES_HW); 386 387 if (DES_FAILED(status)) { 388 syslog(LOG_ERR, "authdes_validate: DES decryption failure"); 389 return (FALSE); 390 } 391 392 /* 393 * xdr the decrypted timestamp 394 */ 395 /* LINTED pointer alignment */ 396 ixdr = (uint32_t *)buf.c; 397 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1; 398 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr); 399 400 /* 401 * validate 402 */ 403 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp, 404 sizeof(struct timeval)) != 0) { 405 syslog(LOG_DEBUG, "authdes_validate: verifier mismatch"); 406 return (FALSE); 407 } 408 409 /* 410 * We have a nickname now, let's use it 411 */ 412 ad->ad_nickname = verf.adv_nickname; 413 ad->ad_cred.adc_namekind = ADN_NICKNAME; 414 return (TRUE); 415 } 416 417 /* 418 * 4. Refresh 419 */ 420 /*ARGSUSED*/ 421 static bool_t 422 authdes_refresh(AUTH *auth, void *dummy) 423 { 424 /* LINTED pointer alignment */ 425 struct ad_private *ad = AUTH_PRIVATE(auth); 426 struct authdes_cred *cred = &ad->ad_cred; 427 int ok; 428 netobj pkey; 429 430 if (ad->ad_dosync) { 431 ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr, 432 ad->ad_timehost, &(ad->ad_uaddr), 433 &(ad->ad_netid)); 434 if (! ok) { 435 /* 436 * Hope the clocks are synced! 437 */ 438 ad->ad_dosync = 0; 439 syslog(LOG_DEBUG, 440 "authdes_refresh: unable to synchronize clock"); 441 } 442 } 443 ad->ad_xkey = auth->ah_key; 444 pkey.n_bytes = (char *)(ad->ad_pkey); 445 pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1; 446 if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) { 447 syslog(LOG_INFO, 448 "authdes_refresh: keyserv(1m) is unable to encrypt session key"); 449 return (FALSE); 450 } 451 cred->adc_fullname.key = ad->ad_xkey; 452 cred->adc_namekind = ADN_FULLNAME; 453 cred->adc_fullname.name = ad->ad_fullname; 454 return (TRUE); 455 } 456 457 458 /* 459 * 5. Destroy 460 */ 461 static void 462 authdes_destroy(AUTH *auth) 463 { 464 /* LINTED pointer alignment */ 465 struct ad_private *ad = AUTH_PRIVATE(auth); 466 467 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 468 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 469 if (ad->ad_timehost) 470 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1); 471 if (ad->ad_netid) 472 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1); 473 if (ad->ad_uaddr) 474 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1); 475 FREE(ad, sizeof(struct ad_private)); 476 FREE(auth, sizeof(AUTH)); 477 } 478 479 static struct auth_ops * 480 authdes_ops(void) 481 { 482 static struct auth_ops ops; 483 484 /* VARIABLES PROTECTED BY ops_lock: ops */ 485 486 mutex_lock(&authdes_ops_lock); 487 if (ops.ah_nextverf == NULL) { 488 ops.ah_nextverf = authdes_nextverf; 489 ops.ah_marshal = authdes_marshal; 490 ops.ah_validate = authdes_validate; 491 ops.ah_refresh = authdes_refresh; 492 ops.ah_destroy = authdes_destroy; 493 } 494 mutex_unlock(&authdes_ops_lock); 495 return (&ops); 496 } 497