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