1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * Portions of this source code were derived from Berkeley 4.3 BSD 32 * under license from the Regents of the University of California. 33 */ 34 35 #pragma ident "%Z%%M% %I% %E% SMI" 36 37 /* 38 * auth_des.c, client-side implementation of DES authentication 39 */ 40 41 #include <sys/types.h> 42 #include <sys/t_lock.h> 43 #include <sys/time.h> 44 #include <sys/systm.h> 45 #include <sys/socket.h> 46 #include <sys/tiuser.h> 47 #include <sys/errno.h> 48 #include <rpc/des_crypt.h> 49 #include <rpc/types.h> 50 #include <rpc/auth.h> 51 #include <rpc/auth_des.h> 52 #include <rpc/xdr.h> 53 #include <rpc/clnt.h> 54 #include <rpc/rpc_msg.h> 55 #include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */ 56 #include <sys/cmn_err.h> 57 #include <sys/debug.h> 58 59 #define MILLION 1000000 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))\ 66 return (FALSE) 67 68 #define gettimeofday(tvp, tzp) uniqtime(tvp) 69 70 static void authdes_nextverf(AUTH *); 71 static bool_t authdes_marshal(AUTH *, XDR *, struct cred *); 72 static bool_t authdes_validate(AUTH *, struct opaque_auth *); 73 static bool_t authdes_refresh(AUTH *, struct rpc_msg *, cred_t *); 74 static void authdes_destroy(AUTH *); 75 static bool_t synchronize(struct knetconfig *, struct netbuf *, 76 int, struct timeval *); 77 78 static struct auth_ops *authdes_ops(void); 79 80 /* 81 * This struct is pointed to by the ah_private field of an "AUTH *" 82 */ 83 struct ad_private { 84 char *ad_fullname; /* client's full name */ 85 uint_t ad_fullnamelen; /* length of name, rounded up */ 86 char *ad_servername; /* server's full name */ 87 uint_t ad_servernamelen; /* length of name, rounded up */ 88 uint_t ad_window; /* client specified window */ 89 bool_t ad_dosync; /* synchronize? */ 90 struct netbuf ad_syncaddr; /* remote host to synch with */ 91 struct knetconfig ad_synconfig; /* netconfig for the synch host */ 92 int ad_calltype; /* use rpc or straight call for sync */ 93 struct timeval ad_timediff; /* server's time - client's time */ 94 uint32_t ad_nickname; /* server's nickname for client */ 95 struct authdes_cred ad_cred; /* storage for credential */ 96 struct authdes_verf ad_verf; /* storage for verifier */ 97 struct timeval ad_timestamp; /* timestamp sent */ 98 des_block ad_xkey; /* encrypted conversation key */ 99 }; 100 101 102 /* 103 * Create the client des authentication object 104 */ 105 /* ARGSUSED */ 106 int 107 authdes_create(char *servername, uint_t window, struct netbuf *syncaddr, 108 struct knetconfig *synconfig, des_block *ckey, int calltype, 109 AUTH **retauth) 110 { 111 AUTH *auth; 112 struct ad_private *ad; 113 char namebuf[MAXNETNAMELEN+1]; 114 int error = 0; 115 enum clnt_stat stat; 116 117 if (retauth == NULL) 118 return (EINVAL); 119 120 *retauth = NULL; 121 122 /* 123 * Allocate everything now 124 */ 125 auth = ALLOC(AUTH); 126 ad = ALLOC(struct ad_private); 127 bzero(ad, sizeof (struct ad_private)); 128 if ((stat = kgetnetname(namebuf)) != 0) { 129 cmn_err(CE_NOTE, 130 "authdes_create: unable to get client's netname: %s (error %d)", 131 clnt_sperrno(stat), stat); 132 goto failed; 133 } 134 135 ad->ad_fullnamelen = (uint_t)RNDUP(strlen(namebuf)); 136 ad->ad_fullname = mem_alloc(ad->ad_fullnamelen + 1); 137 138 ad->ad_servernamelen = (uint_t)strlen(servername); 139 ad->ad_servername = mem_alloc(ad->ad_servernamelen + 1); 140 141 if (auth == NULL || ad == NULL || ad->ad_fullname == NULL || 142 ad->ad_servername == NULL) { 143 cmn_err(CE_NOTE, "authdes_create: out of memory"); 144 error = ENOMEM; 145 goto failed; 146 } 147 148 /* 149 * Set up private data 150 */ 151 bcopy(namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1); 152 bcopy(servername, ad->ad_servername, ad->ad_servernamelen + 1); 153 if (syncaddr != NULL) { 154 ad->ad_syncaddr = *syncaddr; 155 ad->ad_synconfig = *synconfig; 156 ad->ad_dosync = TRUE; 157 ad->ad_calltype = calltype; 158 } else { 159 ad->ad_timediff.tv_sec = 0; 160 ad->ad_timediff.tv_usec = 0; 161 ad->ad_dosync = FALSE; 162 } 163 ad->ad_window = window; 164 if (ckey == NULL) { 165 if ((stat = key_gendes(&auth->ah_key)) != RPC_SUCCESS) { 166 cmn_err(CE_NOTE, 167 "authdes_create: unable to gen conversation key: %s (error %d)", 168 clnt_sperrno(stat), stat); 169 if (stat == RPC_INTR) 170 error = EINTR; 171 else if (stat == RPC_TIMEDOUT) 172 error = ETIMEDOUT; 173 else 174 error = EINVAL; /* XXX */ 175 goto failed; 176 } 177 } else 178 auth->ah_key = *ckey; 179 180 /* 181 * Set up auth handle 182 */ 183 auth->ah_cred.oa_flavor = AUTH_DES; 184 auth->ah_verf.oa_flavor = AUTH_DES; 185 auth->ah_ops = authdes_ops(); 186 auth->ah_private = (caddr_t)ad; 187 188 if (!authdes_refresh(auth, NULL, CRED())) 189 goto failed; 190 191 *retauth = auth; 192 return (0); 193 194 failed: 195 if (ad != NULL && ad->ad_fullname != NULL) 196 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 197 if (ad != NULL && ad->ad_servername != NULL) 198 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 199 if (ad != NULL) 200 FREE(ad, sizeof (struct ad_private)); 201 if (auth != NULL) 202 FREE(auth, sizeof (AUTH)); 203 return ((error == 0) ? EINVAL : error); /* XXX */ 204 } 205 206 /* 207 * Implement the five authentication operations 208 */ 209 210 /* 211 * 1. Next Verifier 212 */ 213 /* ARGSUSED */ 214 static void 215 authdes_nextverf(AUTH *auth) 216 { 217 /* what the heck am I supposed to do??? */ 218 } 219 220 /* 221 * 2. Marshal 222 */ 223 /* ARGSUSED */ 224 static bool_t 225 authdes_marshal(AUTH *auth, XDR *xdrs, struct cred *cr) 226 { 227 /* LINTED pointer alignment */ 228 struct ad_private *ad = AUTH_PRIVATE(auth); 229 struct authdes_cred *cred = &ad->ad_cred; 230 struct authdes_verf *verf = &ad->ad_verf; 231 des_block cryptbuf[2]; 232 des_block ivec; 233 int status; 234 int len; 235 int32_t *ixdr; 236 237 /* 238 * Figure out the "time", accounting for any time difference 239 * with the server if necessary. 240 */ 241 (void) gettimeofday(&ad->ad_timestamp, (struct timezone *)NULL); 242 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec; 243 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec; 244 if (ad->ad_timestamp.tv_usec >= MILLION) { 245 ad->ad_timestamp.tv_usec -= MILLION; 246 ad->ad_timestamp.tv_sec += 1; 247 } 248 249 /* 250 * XDR the timestamp and possibly some other things, then 251 * encrypt them. 252 */ 253 ixdr = (int32_t *)cryptbuf; 254 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec); 255 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec); 256 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 257 IXDR_PUT_U_INT32(ixdr, ad->ad_window); 258 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1); 259 ivec.key.high = ivec.key.low = 0; 260 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf, 261 2 * sizeof (des_block), DES_ENCRYPT, (char *)&ivec); 262 } else { 263 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf, 264 sizeof (des_block), DES_ENCRYPT); 265 } 266 if (DES_FAILED(status)) { 267 cmn_err(CE_NOTE, "authdes_marshal: DES encryption failure"); 268 return (FALSE); 269 } 270 ad->ad_verf.adv_xtimestamp = cryptbuf[0]; 271 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 272 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high; 273 ad->ad_verf.adv_winverf = cryptbuf[1].key.low; 274 } else { 275 ad->ad_cred.adc_nickname = ad->ad_nickname; 276 ad->ad_verf.adv_winverf = 0; 277 } 278 279 /* 280 * Serialize the credential and verifier into opaque 281 * authentication data. 282 */ 283 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { 284 len = ((1 + 1 + 2 + 1) * BYTES_PER_XDR_UNIT + 285 ad->ad_fullnamelen); 286 } else 287 len = (1 + 1) * BYTES_PER_XDR_UNIT; 288 289 if (ixdr = xdr_inline(xdrs, 2 * BYTES_PER_XDR_UNIT)) { 290 IXDR_PUT_INT32(ixdr, AUTH_DES); 291 IXDR_PUT_INT32(ixdr, len); 292 } else { 293 ATTEMPT(xdr_putint32(xdrs, 294 (int32_t *)&auth->ah_cred.oa_flavor)); 295 ATTEMPT(xdr_putint32(xdrs, (int32_t *)&len)); 296 } 297 ATTEMPT(xdr_authdes_cred(xdrs, cred)); 298 299 len = (2 + 1) * BYTES_PER_XDR_UNIT; 300 if (ixdr = xdr_inline(xdrs, 2 * BYTES_PER_XDR_UNIT)) { 301 IXDR_PUT_INT32(ixdr, AUTH_DES); 302 IXDR_PUT_INT32(ixdr, len); 303 } else { 304 ATTEMPT(xdr_putint32(xdrs, 305 (int32_t *)&auth->ah_verf.oa_flavor)); 306 ATTEMPT(xdr_putint32(xdrs, (int32_t *)&len)); 307 } 308 ATTEMPT(xdr_authdes_verf(xdrs, verf)); 309 return (TRUE); 310 } 311 312 /* 313 * 3. Validate 314 */ 315 static bool_t 316 authdes_validate(AUTH *auth, struct opaque_auth *rverf) 317 { 318 /* LINTED pointer alignment */ 319 struct ad_private *ad = AUTH_PRIVATE(auth); 320 struct authdes_verf verf; 321 int status; 322 uint32_t *ixdr; 323 des_block buf; 324 325 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) 326 return (FALSE); 327 328 /* LINTED pointer alignment */ 329 ixdr = (uint32_t *)rverf->oa_base; 330 buf.key.high = (uint32_t)*ixdr++; 331 buf.key.low = (uint32_t)*ixdr++; 332 verf.adv_int_u = IXDR_GET_U_INT32(ixdr); 333 334 /* 335 * Decrypt the timestamp 336 */ 337 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf, 338 sizeof (des_block), DES_DECRYPT); 339 340 if (DES_FAILED(status)) { 341 cmn_err(CE_NOTE, "authdes_validate: DES decryption failure"); 342 return (FALSE); 343 } 344 345 /* 346 * xdr the decrypted timestamp 347 */ 348 /* LINTED pointer alignment */ 349 ixdr = (uint32_t *)buf.c; 350 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1; 351 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr); 352 353 /* 354 * validate 355 */ 356 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp, 357 sizeof (struct timeval)) != 0) { 358 cmn_err(CE_NOTE, "authdes_validate: verifier mismatch"); 359 return (FALSE); 360 } 361 362 /* 363 * We have a nickname now, let's use it 364 */ 365 ad->ad_nickname = verf.adv_nickname; 366 ad->ad_cred.adc_namekind = ADN_NICKNAME; 367 return (TRUE); 368 } 369 370 /* 371 * 4. Refresh 372 * 373 * msg is a dummy argument here. 374 */ 375 /* ARGSUSED */ 376 static bool_t 377 authdes_refresh(AUTH *auth, struct rpc_msg *msg, cred_t *cr) 378 { 379 /* LINTED pointer alignment */ 380 struct ad_private *ad = AUTH_PRIVATE(auth); 381 struct authdes_cred *cred = &ad->ad_cred; 382 enum clnt_stat stat; 383 384 if (ad->ad_dosync && 385 !synchronize(&ad->ad_synconfig, &ad->ad_syncaddr, 386 ad->ad_calltype, &ad->ad_timediff)) { 387 /* 388 * Hope the clocks are synced! 389 */ 390 timerclear(&ad->ad_timediff); 391 cmn_err(CE_NOTE, 392 "authdes_refresh: unable to synchronize with server %s", ad->ad_servername); 393 } 394 ad->ad_xkey = auth->ah_key; 395 if ((stat = key_encryptsession(ad->ad_servername, &ad->ad_xkey, cr)) != 396 RPC_SUCCESS) { 397 cmn_err(CE_NOTE, 398 "authdes_refresh: unable to encrypt conversation key for user (uid %d): " 399 "%s (error %d)", 400 (int)crgetuid(cr), clnt_sperrno(stat), stat); 401 return (FALSE); 402 } 403 cred->adc_fullname.key = ad->ad_xkey; 404 cred->adc_namekind = ADN_FULLNAME; 405 cred->adc_fullname.name = ad->ad_fullname; 406 return (TRUE); 407 } 408 409 /* 410 * 5. Destroy 411 */ 412 static void 413 authdes_destroy(AUTH *auth) 414 { 415 /* LINTED pointer alignment */ 416 struct ad_private *ad = AUTH_PRIVATE(auth); 417 418 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1); 419 FREE(ad->ad_servername, ad->ad_servernamelen + 1); 420 FREE(ad, sizeof (struct ad_private)); 421 FREE(auth, sizeof (AUTH)); 422 } 423 424 425 /* 426 * Synchronize with the server at the given address, that is, 427 * adjust timep to reflect the delta between our clocks 428 */ 429 static bool_t 430 synchronize(struct knetconfig *synconfig, struct netbuf *syncaddr, int calltype, 431 struct timeval *timep) 432 { 433 struct timeval mytime; 434 struct timeval timout; 435 436 timout.tv_sec = RTIME_TIMEOUT; 437 timout.tv_usec = 0; 438 if (rtime(synconfig, syncaddr, calltype, timep, &timout) < 0) 439 return (FALSE); 440 (void) gettimeofday(&mytime, (struct timezone *)NULL); 441 timep->tv_sec -= mytime.tv_sec; 442 if (mytime.tv_usec > timep->tv_usec) { 443 timep->tv_sec -= 1; 444 timep->tv_usec += MILLION; 445 } 446 timep->tv_usec -= mytime.tv_usec; 447 return (TRUE); 448 } 449 450 static struct auth_ops * 451 authdes_ops(void) 452 { 453 static struct auth_ops ops; 454 455 mutex_enter(&authdes_ops_lock); 456 if (ops.ah_nextverf == NULL) { 457 ops.ah_nextverf = authdes_nextverf; 458 ops.ah_marshal = authdes_marshal; 459 ops.ah_validate = authdes_validate; 460 ops.ah_refresh = authdes_refresh; 461 ops.ah_destroy = authdes_destroy; 462 ops.ah_wrap = authany_wrap; 463 ops.ah_unwrap = authany_unwrap; 464 } 465 mutex_exit(&authdes_ops_lock); 466 return (&ops); 467 } 468