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 /* 30 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 31 */ 32 33 #ident "@(#)key_call.c 1.25 94/04/24 SMI" 34 35 #if defined(LIBC_SCCS) && !defined(lint) 36 static char rcsid[] = 37 "$FreeBSD$"; 38 #endif /* not lint */ 39 40 /* 41 * key_call.c, Interface to keyserver 42 * 43 * setsecretkey(key) - set your secret key 44 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent 45 * decryptsessionkey(agent, deskey) - decrypt ditto 46 * gendeskey(deskey) - generate a secure des key 47 */ 48 49 #include "namespace.h" 50 #include "reentrant.h" 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <unistd.h> 54 #include <errno.h> 55 #include <rpc/rpc.h> 56 #include <rpc/auth.h> 57 #include <rpc/auth_unix.h> 58 #include <rpc/key_prot.h> 59 #include <string.h> 60 #include <netconfig.h> 61 #include <sys/utsname.h> 62 #include <stdlib.h> 63 #include <signal.h> 64 #include <sys/wait.h> 65 #include <sys/fcntl.h> 66 #include "un-namespace.h" 67 68 69 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */ 70 #define KEY_NRETRY 12 /* number of retries */ 71 72 #ifdef DEBUG 73 #define debug(msg) (void) fprintf(stderr, "%s\n", msg); 74 #else 75 #define debug(msg) 76 #endif /* DEBUG */ 77 78 /* 79 * Hack to allow the keyserver to use AUTH_DES (for authenticated 80 * NIS+ calls, for example). The only functions that get called 81 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes. 82 * 83 * The approach is to have the keyserver fill in pointers to local 84 * implementations of these functions, and to call those in key_call(). 85 */ 86 87 cryptkeyres *(*__key_encryptsession_pk_LOCAL)() = 0; 88 cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = 0; 89 des_block *(*__key_gendes_LOCAL)() = 0; 90 91 static int key_call __P(( u_long, xdrproc_t, char *, xdrproc_t, char * )); 92 93 int 94 key_setsecret(secretkey) 95 const char *secretkey; 96 { 97 keystatus status; 98 99 if (!key_call((u_long) KEY_SET, xdr_keybuf, (char *) secretkey, 100 xdr_keystatus, (char *)&status)) { 101 return (-1); 102 } 103 if (status != KEY_SUCCESS) { 104 debug("set status is nonzero"); 105 return (-1); 106 } 107 return (0); 108 } 109 110 111 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key 112 * stored for the caller's effective uid; it returns 0 otherwise 113 * 114 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't 115 * be using it, because it allows them to get the user's secret key. 116 */ 117 118 int 119 key_secretkey_is_set(void) 120 { 121 struct key_netstres kres; 122 123 memset((void*)&kres, 0, sizeof (kres)); 124 if (key_call((u_long) KEY_NET_GET, xdr_void, (char *)NULL, 125 xdr_key_netstres, (char *) &kres) && 126 (kres.status == KEY_SUCCESS) && 127 (kres.key_netstres_u.knet.st_priv_key[0] != 0)) { 128 /* avoid leaving secret key in memory */ 129 memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES); 130 return (1); 131 } 132 return (0); 133 } 134 135 int 136 key_encryptsession_pk(remotename, remotekey, deskey) 137 char *remotename; 138 netobj *remotekey; 139 des_block *deskey; 140 { 141 cryptkeyarg2 arg; 142 cryptkeyres res; 143 144 arg.remotename = remotename; 145 arg.remotekey = *remotekey; 146 arg.deskey = *deskey; 147 if (!key_call((u_long)KEY_ENCRYPT_PK, xdr_cryptkeyarg2, (char *)&arg, 148 xdr_cryptkeyres, (char *)&res)) { 149 return (-1); 150 } 151 if (res.status != KEY_SUCCESS) { 152 debug("encrypt status is nonzero"); 153 return (-1); 154 } 155 *deskey = res.cryptkeyres_u.deskey; 156 return (0); 157 } 158 159 int 160 key_decryptsession_pk(remotename, remotekey, deskey) 161 char *remotename; 162 netobj *remotekey; 163 des_block *deskey; 164 { 165 cryptkeyarg2 arg; 166 cryptkeyres res; 167 168 arg.remotename = remotename; 169 arg.remotekey = *remotekey; 170 arg.deskey = *deskey; 171 if (!key_call((u_long)KEY_DECRYPT_PK, xdr_cryptkeyarg2, (char *)&arg, 172 xdr_cryptkeyres, (char *)&res)) { 173 return (-1); 174 } 175 if (res.status != KEY_SUCCESS) { 176 debug("decrypt status is nonzero"); 177 return (-1); 178 } 179 *deskey = res.cryptkeyres_u.deskey; 180 return (0); 181 } 182 183 int 184 key_encryptsession(remotename, deskey) 185 const char *remotename; 186 des_block *deskey; 187 { 188 cryptkeyarg arg; 189 cryptkeyres res; 190 191 arg.remotename = (char *) remotename; 192 arg.deskey = *deskey; 193 if (!key_call((u_long)KEY_ENCRYPT, xdr_cryptkeyarg, (char *)&arg, 194 xdr_cryptkeyres, (char *)&res)) { 195 return (-1); 196 } 197 if (res.status != KEY_SUCCESS) { 198 debug("encrypt status is nonzero"); 199 return (-1); 200 } 201 *deskey = res.cryptkeyres_u.deskey; 202 return (0); 203 } 204 205 int 206 key_decryptsession(remotename, deskey) 207 const char *remotename; 208 des_block *deskey; 209 { 210 cryptkeyarg arg; 211 cryptkeyres res; 212 213 arg.remotename = (char *) remotename; 214 arg.deskey = *deskey; 215 if (!key_call((u_long)KEY_DECRYPT, xdr_cryptkeyarg, (char *)&arg, 216 xdr_cryptkeyres, (char *)&res)) { 217 return (-1); 218 } 219 if (res.status != KEY_SUCCESS) { 220 debug("decrypt status is nonzero"); 221 return (-1); 222 } 223 *deskey = res.cryptkeyres_u.deskey; 224 return (0); 225 } 226 227 int 228 key_gendes(key) 229 des_block *key; 230 { 231 if (!key_call((u_long)KEY_GEN, xdr_void, (char *)NULL, 232 xdr_des_block, (char *)key)) { 233 return (-1); 234 } 235 return (0); 236 } 237 238 int 239 key_setnet(arg) 240 struct key_netstarg *arg; 241 { 242 keystatus status; 243 244 245 if (!key_call((u_long) KEY_NET_PUT, xdr_key_netstarg, (char *) arg, 246 xdr_keystatus, (char *) &status)){ 247 return (-1); 248 } 249 250 if (status != KEY_SUCCESS) { 251 debug("key_setnet status is nonzero"); 252 return (-1); 253 } 254 return (1); 255 } 256 257 258 int 259 key_get_conv(pkey, deskey) 260 char *pkey; 261 des_block *deskey; 262 { 263 cryptkeyres res; 264 265 if (!key_call((u_long) KEY_GET_CONV, xdr_keybuf, pkey, 266 xdr_cryptkeyres, (char *)&res)) { 267 return (-1); 268 } 269 if (res.status != KEY_SUCCESS) { 270 debug("get_conv status is nonzero"); 271 return (-1); 272 } 273 *deskey = res.cryptkeyres_u.deskey; 274 return (0); 275 } 276 277 struct key_call_private { 278 CLIENT *client; /* Client handle */ 279 pid_t pid; /* process-id at moment of creation */ 280 uid_t uid; /* user-id at last authorization */ 281 }; 282 static struct key_call_private *key_call_private_main = NULL; 283 284 static void 285 key_call_destroy(void *vp) 286 { 287 register struct key_call_private *kcp = (struct key_call_private *)vp; 288 289 if (kcp) { 290 if (kcp->client) 291 clnt_destroy(kcp->client); 292 free(kcp); 293 } 294 } 295 296 /* 297 * Keep the handle cached. This call may be made quite often. 298 */ 299 static CLIENT * 300 getkeyserv_handle(vers) 301 int vers; 302 { 303 void *localhandle; 304 struct netconfig *nconf; 305 struct netconfig *tpconf; 306 struct key_call_private *kcp = key_call_private_main; 307 struct timeval wait_time; 308 struct utsname u; 309 int main_thread; 310 int fd; 311 static thread_key_t key_call_key; 312 extern mutex_t tsd_lock; 313 314 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 315 #define TOTAL_TRIES 5 /* Number of tries */ 316 317 if ((main_thread = thr_main())) { 318 kcp = key_call_private_main; 319 } else { 320 if (key_call_key == 0) { 321 mutex_lock(&tsd_lock); 322 if (key_call_key == 0) 323 thr_keycreate(&key_call_key, key_call_destroy); 324 mutex_unlock(&tsd_lock); 325 } 326 kcp = (struct key_call_private *)thr_getspecific(key_call_key); 327 } 328 if (kcp == (struct key_call_private *)NULL) { 329 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 330 if (kcp == (struct key_call_private *)NULL) { 331 return ((CLIENT *) NULL); 332 } 333 if (main_thread) 334 key_call_private_main = kcp; 335 else 336 thr_setspecific(key_call_key, (void *) kcp); 337 kcp->client = NULL; 338 } 339 340 /* if pid has changed, destroy client and rebuild */ 341 if (kcp->client != NULL && kcp->pid != getpid()) { 342 clnt_destroy(kcp->client); 343 kcp->client = NULL; 344 } 345 346 if (kcp->client != NULL) { 347 /* if uid has changed, build client handle again */ 348 if (kcp->uid != geteuid()) { 349 kcp->uid = geteuid(); 350 auth_destroy(kcp->client->cl_auth); 351 kcp->client->cl_auth = 352 authsys_create("", kcp->uid, 0, 0, NULL); 353 if (kcp->client->cl_auth == NULL) { 354 clnt_destroy(kcp->client); 355 kcp->client = NULL; 356 return ((CLIENT *) NULL); 357 } 358 } 359 /* Change the version number to the new one */ 360 clnt_control(kcp->client, CLSET_VERS, (void *)&vers); 361 return (kcp->client); 362 } 363 if (!(localhandle = setnetconfig())) { 364 return ((CLIENT *) NULL); 365 } 366 tpconf = NULL; 367 #if defined(__FreeBSD__) 368 if (uname(&u) == -1) 369 #else 370 #if defined(i386) 371 if (_nuname(&u) == -1) 372 #elif defined(sparc) 373 if (_uname(&u) == -1) 374 #else 375 #error Unknown architecture! 376 #endif 377 #endif 378 { 379 endnetconfig(localhandle); 380 return ((CLIENT *) NULL); 381 } 382 while ((nconf = getnetconfig(localhandle)) != NULL) { 383 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) { 384 /* 385 * We use COTS_ORD here so that the caller can 386 * find out immediately if the server is dead. 387 */ 388 if (nconf->nc_semantics == NC_TPI_COTS_ORD) { 389 kcp->client = clnt_tp_create(u.nodename, 390 KEY_PROG, vers, nconf); 391 if (kcp->client) 392 break; 393 } else { 394 tpconf = nconf; 395 } 396 } 397 } 398 if ((kcp->client == (CLIENT *) NULL) && (tpconf)) 399 /* Now, try the CLTS or COTS loopback transport */ 400 kcp->client = clnt_tp_create(u.nodename, 401 KEY_PROG, vers, tpconf); 402 endnetconfig(localhandle); 403 404 if (kcp->client == (CLIENT *) NULL) { 405 return ((CLIENT *) NULL); 406 } 407 kcp->uid = geteuid(); 408 kcp->pid = getpid(); 409 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 410 if (kcp->client->cl_auth == NULL) { 411 clnt_destroy(kcp->client); 412 kcp->client = NULL; 413 return ((CLIENT *) NULL); 414 } 415 416 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 417 wait_time.tv_usec = 0; 418 (void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 419 (char *)&wait_time); 420 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 421 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 422 423 return (kcp->client); 424 } 425 426 /* returns 0 on failure, 1 on success */ 427 428 static int 429 key_call(proc, xdr_arg, arg, xdr_rslt, rslt) 430 u_long proc; 431 xdrproc_t xdr_arg; 432 char *arg; 433 xdrproc_t xdr_rslt; 434 char *rslt; 435 { 436 CLIENT *clnt; 437 struct timeval wait_time; 438 439 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 440 cryptkeyres *res; 441 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 442 *(cryptkeyres*)rslt = *res; 443 return (1); 444 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 445 cryptkeyres *res; 446 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 447 *(cryptkeyres*)rslt = *res; 448 return (1); 449 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 450 des_block *res; 451 res = (*__key_gendes_LOCAL)(geteuid(), 0); 452 *(des_block*)rslt = *res; 453 return (1); 454 } 455 456 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 457 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 458 (proc == KEY_GET_CONV)) 459 clnt = getkeyserv_handle(2); /* talk to version 2 */ 460 else 461 clnt = getkeyserv_handle(1); /* talk to version 1 */ 462 463 if (clnt == NULL) { 464 return (0); 465 } 466 467 wait_time.tv_sec = TOTAL_TIMEOUT; 468 wait_time.tv_usec = 0; 469 470 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 471 wait_time) == RPC_SUCCESS) { 472 return (1); 473 } else { 474 return (0); 475 } 476 } 477