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 /* 29 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 30 */ 31 32 #ident "@(#)key_call.c 1.25 94/04/24 SMI" 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 /* 37 * key_call.c, Interface to keyserver 38 * 39 * setsecretkey(key) - set your secret key 40 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent 41 * decryptsessionkey(agent, deskey) - decrypt ditto 42 * gendeskey(deskey) - generate a secure des key 43 */ 44 45 #include "namespace.h" 46 #include "reentrant.h" 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 #include <errno.h> 51 #include <rpc/rpc.h> 52 #include <rpc/auth.h> 53 #include <rpc/auth_unix.h> 54 #include <rpc/key_prot.h> 55 #include <string.h> 56 #include <netconfig.h> 57 #include <sys/utsname.h> 58 #include <stdlib.h> 59 #include <signal.h> 60 #include <sys/wait.h> 61 #include <sys/fcntl.h> 62 #include "un-namespace.h" 63 #include "mt_misc.h" 64 65 66 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */ 67 #define KEY_NRETRY 12 /* number of retries */ 68 69 #ifdef DEBUG 70 #define debug(msg) (void) fprintf(stderr, "%s\n", msg); 71 #else 72 #define debug(msg) 73 #endif /* DEBUG */ 74 75 /* 76 * Hack to allow the keyserver to use AUTH_DES (for authenticated 77 * NIS+ calls, for example). The only functions that get called 78 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes. 79 * 80 * The approach is to have the keyserver fill in pointers to local 81 * implementations of these functions, and to call those in key_call(). 82 */ 83 84 cryptkeyres *(*__key_encryptsession_pk_LOCAL)() = 0; 85 cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = 0; 86 des_block *(*__key_gendes_LOCAL)() = 0; 87 88 static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *); 89 90 int 91 key_setsecret(secretkey) 92 const char *secretkey; 93 { 94 keystatus status; 95 96 if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf, 97 (void *)secretkey, 98 (xdrproc_t)xdr_keystatus, &status)) { 99 return (-1); 100 } 101 if (status != KEY_SUCCESS) { 102 debug("set status is nonzero"); 103 return (-1); 104 } 105 return (0); 106 } 107 108 109 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key 110 * stored for the caller's effective uid; it returns 0 otherwise 111 * 112 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't 113 * be using it, because it allows them to get the user's secret key. 114 */ 115 116 int 117 key_secretkey_is_set(void) 118 { 119 struct key_netstres kres; 120 121 memset((void*)&kres, 0, sizeof (kres)); 122 if (key_call((u_long) KEY_NET_GET, (xdrproc_t)xdr_void, NULL, 123 (xdrproc_t)xdr_key_netstres, &kres) && 124 (kres.status == KEY_SUCCESS) && 125 (kres.key_netstres_u.knet.st_priv_key[0] != 0)) { 126 /* avoid leaving secret key in memory */ 127 memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES); 128 return (1); 129 } 130 return (0); 131 } 132 133 int 134 key_encryptsession_pk(remotename, remotekey, deskey) 135 char *remotename; 136 netobj *remotekey; 137 des_block *deskey; 138 { 139 cryptkeyarg2 arg; 140 cryptkeyres res; 141 142 arg.remotename = remotename; 143 arg.remotekey = *remotekey; 144 arg.deskey = *deskey; 145 if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg, 146 (xdrproc_t)xdr_cryptkeyres, &res)) { 147 return (-1); 148 } 149 if (res.status != KEY_SUCCESS) { 150 debug("encrypt status is nonzero"); 151 return (-1); 152 } 153 *deskey = res.cryptkeyres_u.deskey; 154 return (0); 155 } 156 157 int 158 key_decryptsession_pk(remotename, remotekey, deskey) 159 char *remotename; 160 netobj *remotekey; 161 des_block *deskey; 162 { 163 cryptkeyarg2 arg; 164 cryptkeyres res; 165 166 arg.remotename = remotename; 167 arg.remotekey = *remotekey; 168 arg.deskey = *deskey; 169 if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg, 170 (xdrproc_t)xdr_cryptkeyres, &res)) { 171 return (-1); 172 } 173 if (res.status != KEY_SUCCESS) { 174 debug("decrypt status is nonzero"); 175 return (-1); 176 } 177 *deskey = res.cryptkeyres_u.deskey; 178 return (0); 179 } 180 181 int 182 key_encryptsession(remotename, deskey) 183 const char *remotename; 184 des_block *deskey; 185 { 186 cryptkeyarg arg; 187 cryptkeyres res; 188 189 arg.remotename = (char *) remotename; 190 arg.deskey = *deskey; 191 if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg, 192 (xdrproc_t)xdr_cryptkeyres, &res)) { 193 return (-1); 194 } 195 if (res.status != KEY_SUCCESS) { 196 debug("encrypt status is nonzero"); 197 return (-1); 198 } 199 *deskey = res.cryptkeyres_u.deskey; 200 return (0); 201 } 202 203 int 204 key_decryptsession(remotename, deskey) 205 const char *remotename; 206 des_block *deskey; 207 { 208 cryptkeyarg arg; 209 cryptkeyres res; 210 211 arg.remotename = (char *) remotename; 212 arg.deskey = *deskey; 213 if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg, 214 (xdrproc_t)xdr_cryptkeyres, &res)) { 215 return (-1); 216 } 217 if (res.status != KEY_SUCCESS) { 218 debug("decrypt status is nonzero"); 219 return (-1); 220 } 221 *deskey = res.cryptkeyres_u.deskey; 222 return (0); 223 } 224 225 int 226 key_gendes(key) 227 des_block *key; 228 { 229 if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL, 230 (xdrproc_t)xdr_des_block, key)) { 231 return (-1); 232 } 233 return (0); 234 } 235 236 int 237 key_setnet(arg) 238 struct key_netstarg *arg; 239 { 240 keystatus status; 241 242 243 if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg, 244 (xdrproc_t)xdr_keystatus, &status)){ 245 return (-1); 246 } 247 248 if (status != KEY_SUCCESS) { 249 debug("key_setnet status is nonzero"); 250 return (-1); 251 } 252 return (1); 253 } 254 255 256 int 257 key_get_conv(pkey, deskey) 258 char *pkey; 259 des_block *deskey; 260 { 261 cryptkeyres res; 262 263 if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey, 264 (xdrproc_t)xdr_cryptkeyres, &res)) { 265 return (-1); 266 } 267 if (res.status != KEY_SUCCESS) { 268 debug("get_conv status is nonzero"); 269 return (-1); 270 } 271 *deskey = res.cryptkeyres_u.deskey; 272 return (0); 273 } 274 275 struct key_call_private { 276 CLIENT *client; /* Client handle */ 277 pid_t pid; /* process-id at moment of creation */ 278 uid_t uid; /* user-id at last authorization */ 279 }; 280 static struct key_call_private *key_call_private_main = NULL; 281 static thread_key_t key_call_key; 282 static once_t key_call_once = ONCE_INITIALIZER; 283 static int key_call_key_error; 284 285 static void 286 key_call_destroy(void *vp) 287 { 288 struct key_call_private *kcp = (struct key_call_private *)vp; 289 290 if (kcp) { 291 if (kcp->client) 292 clnt_destroy(kcp->client); 293 free(kcp); 294 } 295 } 296 297 static void 298 key_call_init(void) 299 { 300 301 key_call_key_error = thr_keycreate(&key_call_key, key_call_destroy); 302 } 303 304 /* 305 * Keep the handle cached. This call may be made quite often. 306 */ 307 static CLIENT * 308 getkeyserv_handle(vers) 309 int vers; 310 { 311 void *localhandle; 312 struct netconfig *nconf; 313 struct netconfig *tpconf; 314 struct key_call_private *kcp; 315 struct timeval wait_time; 316 struct utsname u; 317 int main_thread; 318 int fd; 319 320 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 321 #define TOTAL_TRIES 5 /* Number of tries */ 322 323 if ((main_thread = thr_main())) { 324 kcp = key_call_private_main; 325 } else { 326 if (thr_once(&key_call_once, key_call_init) != 0 || 327 key_call_key_error != 0) 328 return ((CLIENT *) NULL); 329 kcp = (struct key_call_private *)thr_getspecific(key_call_key); 330 } 331 if (kcp == (struct key_call_private *)NULL) { 332 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 333 if (kcp == (struct key_call_private *)NULL) { 334 return ((CLIENT *) NULL); 335 } 336 if (main_thread) 337 key_call_private_main = kcp; 338 else 339 thr_setspecific(key_call_key, (void *) kcp); 340 kcp->client = NULL; 341 } 342 343 /* if pid has changed, destroy client and rebuild */ 344 if (kcp->client != NULL && kcp->pid != getpid()) { 345 clnt_destroy(kcp->client); 346 kcp->client = NULL; 347 } 348 349 if (kcp->client != NULL) { 350 /* if uid has changed, build client handle again */ 351 if (kcp->uid != geteuid()) { 352 kcp->uid = geteuid(); 353 auth_destroy(kcp->client->cl_auth); 354 kcp->client->cl_auth = 355 authsys_create("", kcp->uid, 0, 0, NULL); 356 if (kcp->client->cl_auth == NULL) { 357 clnt_destroy(kcp->client); 358 kcp->client = NULL; 359 return ((CLIENT *) NULL); 360 } 361 } 362 /* Change the version number to the new one */ 363 clnt_control(kcp->client, CLSET_VERS, (void *)&vers); 364 return (kcp->client); 365 } 366 if (!(localhandle = setnetconfig())) { 367 return ((CLIENT *) NULL); 368 } 369 tpconf = NULL; 370 #if defined(__FreeBSD__) 371 if (uname(&u) == -1) 372 #else 373 #if defined(i386) 374 if (_nuname(&u) == -1) 375 #elif defined(sparc) 376 if (_uname(&u) == -1) 377 #else 378 #error Unknown architecture! 379 #endif 380 #endif 381 { 382 endnetconfig(localhandle); 383 return ((CLIENT *) NULL); 384 } 385 while ((nconf = getnetconfig(localhandle)) != NULL) { 386 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) { 387 /* 388 * We use COTS_ORD here so that the caller can 389 * find out immediately if the server is dead. 390 */ 391 if (nconf->nc_semantics == NC_TPI_COTS_ORD) { 392 kcp->client = clnt_tp_create(u.nodename, 393 KEY_PROG, vers, nconf); 394 if (kcp->client) 395 break; 396 } else { 397 tpconf = nconf; 398 } 399 } 400 } 401 if ((kcp->client == (CLIENT *) NULL) && (tpconf)) 402 /* Now, try the CLTS or COTS loopback transport */ 403 kcp->client = clnt_tp_create(u.nodename, 404 KEY_PROG, vers, tpconf); 405 endnetconfig(localhandle); 406 407 if (kcp->client == (CLIENT *) NULL) { 408 return ((CLIENT *) NULL); 409 } 410 kcp->uid = geteuid(); 411 kcp->pid = getpid(); 412 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 413 if (kcp->client->cl_auth == NULL) { 414 clnt_destroy(kcp->client); 415 kcp->client = NULL; 416 return ((CLIENT *) NULL); 417 } 418 419 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 420 wait_time.tv_usec = 0; 421 (void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 422 (char *)&wait_time); 423 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 424 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 425 426 return (kcp->client); 427 } 428 429 /* returns 0 on failure, 1 on success */ 430 431 static int 432 key_call(proc, xdr_arg, arg, xdr_rslt, rslt) 433 u_long proc; 434 xdrproc_t xdr_arg; 435 void *arg; 436 xdrproc_t xdr_rslt; 437 void *rslt; 438 { 439 CLIENT *clnt; 440 struct timeval wait_time; 441 442 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 443 cryptkeyres *res; 444 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 445 *(cryptkeyres*)rslt = *res; 446 return (1); 447 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 448 cryptkeyres *res; 449 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 450 *(cryptkeyres*)rslt = *res; 451 return (1); 452 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 453 des_block *res; 454 res = (*__key_gendes_LOCAL)(geteuid(), 0); 455 *(des_block*)rslt = *res; 456 return (1); 457 } 458 459 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 460 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 461 (proc == KEY_GET_CONV)) 462 clnt = getkeyserv_handle(2); /* talk to version 2 */ 463 else 464 clnt = getkeyserv_handle(1); /* talk to version 1 */ 465 466 if (clnt == NULL) { 467 return (0); 468 } 469 470 wait_time.tv_sec = TOTAL_TIMEOUT; 471 wait_time.tv_usec = 0; 472 473 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 474 wait_time) == RPC_SUCCESS) { 475 return (1); 476 } else { 477 return (0); 478 } 479 } 480