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 * @(#)key_call.c 1.25 94/04/24 SMI 33 * $FreeBSD: src/lib/libc/rpc/key_call.c,v 1.16 2006/02/27 22:10:59 deischen Exp $ 34 */ 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 <signal.h> 59 #include <sys/wait.h> 60 #include <sys/fcntl.h> 61 #include "un-namespace.h" 62 #include "mt_misc.h" 63 64 65 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */ 66 #define KEY_NRETRY 12 /* number of retries */ 67 68 #ifdef DEBUG 69 #define debug(msg) fprintf(stderr, "%s\n", msg); 70 #else 71 #define debug(msg) 72 #endif /* DEBUG */ 73 74 /* 75 * Hack to allow the keyserver to use AUTH_DES (for authenticated 76 * NIS+ calls, for example). The only functions that get called 77 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes. 78 * 79 * The approach is to have the keyserver fill in pointers to local 80 * implementations of these functions, and to call those in key_call(). 81 */ 82 83 cryptkeyres *(*__key_encryptsession_pk_LOCAL)() = NULL; 84 cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = NULL; 85 des_block *(*__key_gendes_LOCAL)() = NULL; 86 87 static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *); 88 89 int 90 key_setsecret(const char *secretkey) 91 { 92 keystatus status; 93 94 if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf, secretkey, 95 (xdrproc_t)xdr_keystatus, &status)) { 96 return (-1); 97 } 98 if (status != KEY_SUCCESS) { 99 debug("set status is nonzero"); 100 return (-1); 101 } 102 return (0); 103 } 104 105 106 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key 107 * stored for the caller's effective uid; it returns 0 otherwise 108 * 109 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't 110 * be using it, because it allows them to get the user's secret key. 111 */ 112 113 int 114 key_secretkey_is_set(void) 115 { 116 struct key_netstres kres; 117 118 memset((void*)&kres, 0, sizeof (kres)); 119 if (key_call((u_long) KEY_NET_GET, (xdrproc_t)xdr_void, NULL, 120 (xdrproc_t)xdr_key_netstres, &kres) && 121 (kres.status == KEY_SUCCESS) && 122 (kres.key_netstres_u.knet.st_priv_key[0] != 0)) { 123 /* avoid leaving secret key in memory */ 124 memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES); 125 return (1); 126 } 127 return (0); 128 } 129 130 int 131 key_encryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey) 132 { 133 cryptkeyarg2 arg; 134 cryptkeyres res; 135 136 arg.remotename = remotename; 137 arg.remotekey = *remotekey; 138 arg.deskey = *deskey; 139 if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg, 140 (xdrproc_t)xdr_cryptkeyres, &res)) { 141 return (-1); 142 } 143 if (res.status != KEY_SUCCESS) { 144 debug("encrypt status is nonzero"); 145 return (-1); 146 } 147 *deskey = res.cryptkeyres_u.deskey; 148 return (0); 149 } 150 151 int 152 key_decryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey) 153 { 154 cryptkeyarg2 arg; 155 cryptkeyres res; 156 157 arg.remotename = remotename; 158 arg.remotekey = *remotekey; 159 arg.deskey = *deskey; 160 if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg, 161 (xdrproc_t)xdr_cryptkeyres, &res)) { 162 return (-1); 163 } 164 if (res.status != KEY_SUCCESS) { 165 debug("decrypt status is nonzero"); 166 return (-1); 167 } 168 *deskey = res.cryptkeyres_u.deskey; 169 return (0); 170 } 171 172 int 173 key_encryptsession(const char *remotename, des_block *deskey) 174 { 175 cryptkeyarg arg; 176 cryptkeyres res; 177 178 arg.remotename = (char *) remotename; 179 arg.deskey = *deskey; 180 if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg, 181 (xdrproc_t)xdr_cryptkeyres, &res)) { 182 return (-1); 183 } 184 if (res.status != KEY_SUCCESS) { 185 debug("encrypt status is nonzero"); 186 return (-1); 187 } 188 *deskey = res.cryptkeyres_u.deskey; 189 return (0); 190 } 191 192 int 193 key_decryptsession(const char *remotename, des_block *deskey) 194 { 195 cryptkeyarg arg; 196 cryptkeyres res; 197 198 arg.remotename = (char *) remotename; 199 arg.deskey = *deskey; 200 if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg, 201 (xdrproc_t)xdr_cryptkeyres, &res)) { 202 return (-1); 203 } 204 if (res.status != KEY_SUCCESS) { 205 debug("decrypt status is nonzero"); 206 return (-1); 207 } 208 *deskey = res.cryptkeyres_u.deskey; 209 return (0); 210 } 211 212 int 213 key_gendes(des_block *key) 214 { 215 if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL, 216 (xdrproc_t)xdr_des_block, key)) { 217 return (-1); 218 } 219 return (0); 220 } 221 222 int 223 key_setnet(struct key_netstarg *arg) 224 { 225 keystatus status; 226 227 228 if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg, 229 (xdrproc_t)xdr_keystatus, &status)){ 230 return (-1); 231 } 232 233 if (status != KEY_SUCCESS) { 234 debug("key_setnet status is nonzero"); 235 return (-1); 236 } 237 return (1); 238 } 239 240 241 int 242 key_get_conv(char *pkey, des_block *deskey) 243 { 244 cryptkeyres res; 245 246 if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey, 247 (xdrproc_t)xdr_cryptkeyres, &res)) { 248 return (-1); 249 } 250 if (res.status != KEY_SUCCESS) { 251 debug("get_conv status is nonzero"); 252 return (-1); 253 } 254 *deskey = res.cryptkeyres_u.deskey; 255 return (0); 256 } 257 258 struct key_call_private { 259 CLIENT *client; /* Client handle */ 260 pid_t pid; /* process-id at moment of creation */ 261 uid_t uid; /* user-id at last authorization */ 262 }; 263 static struct key_call_private *key_call_private_main = NULL; 264 265 static void 266 key_call_destroy(void *vp) 267 { 268 struct key_call_private *kcp = (struct key_call_private *)vp; 269 270 if (kcp) { 271 if (kcp->client) 272 clnt_destroy(kcp->client); 273 free(kcp); 274 } 275 } 276 277 /* 278 * Keep the handle cached. This call may be made quite often. 279 */ 280 static CLIENT * 281 getkeyserv_handle(int vers) 282 { 283 void *localhandle; 284 struct netconfig *nconf; 285 struct netconfig *tpconf; 286 struct key_call_private *kcp = key_call_private_main; 287 struct timeval wait_time; 288 struct utsname u; 289 int main_thread; 290 int fd; 291 static thread_key_t key_call_key; 292 293 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 294 #define TOTAL_TRIES 5 /* Number of tries */ 295 296 if ((main_thread = thr_main())) { 297 kcp = key_call_private_main; 298 } else { 299 if (key_call_key == 0) { 300 mutex_lock(&tsd_lock); 301 if (key_call_key == 0) 302 thr_keycreate(&key_call_key, key_call_destroy); 303 mutex_unlock(&tsd_lock); 304 } 305 kcp = (struct key_call_private *)thr_getspecific(key_call_key); 306 } 307 if (kcp == NULL) { 308 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 309 if (kcp == NULL) { 310 return (NULL); 311 } 312 if (main_thread) 313 key_call_private_main = kcp; 314 else 315 thr_setspecific(key_call_key, (void *) kcp); 316 kcp->client = NULL; 317 } 318 319 /* if pid has changed, destroy client and rebuild */ 320 if (kcp->client != NULL && kcp->pid != getpid()) { 321 clnt_destroy(kcp->client); 322 kcp->client = NULL; 323 } 324 325 if (kcp->client != NULL) { 326 /* if uid has changed, build client handle again */ 327 if (kcp->uid != geteuid()) { 328 kcp->uid = geteuid(); 329 auth_destroy(kcp->client->cl_auth); 330 kcp->client->cl_auth = 331 authsys_create("", kcp->uid, 0, 0, NULL); 332 if (kcp->client->cl_auth == NULL) { 333 clnt_destroy(kcp->client); 334 kcp->client = NULL; 335 return (NULL); 336 } 337 } 338 /* Change the version number to the new one */ 339 clnt_control(kcp->client, CLSET_VERS, (void *)&vers); 340 return (kcp->client); 341 } 342 if (!(localhandle = setnetconfig())) { 343 return (NULL); 344 } 345 tpconf = NULL; 346 if (uname(&u) == -1) 347 { 348 endnetconfig(localhandle); 349 return (NULL); 350 } 351 while ((nconf = getnetconfig(localhandle)) != NULL) { 352 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) { 353 /* 354 * We use COTS_ORD here so that the caller can 355 * find out immediately if the server is dead. 356 */ 357 if (nconf->nc_semantics == NC_TPI_COTS_ORD) { 358 kcp->client = clnt_tp_create(u.nodename, 359 KEY_PROG, vers, nconf); 360 if (kcp->client) 361 break; 362 } else { 363 tpconf = nconf; 364 } 365 } 366 } 367 if ((kcp->client == NULL) && (tpconf)) 368 /* Now, try the CLTS or COTS loopback transport */ 369 kcp->client = clnt_tp_create(u.nodename, 370 KEY_PROG, vers, tpconf); 371 endnetconfig(localhandle); 372 373 if (kcp->client == NULL) { 374 return (NULL); 375 } 376 kcp->uid = geteuid(); 377 kcp->pid = getpid(); 378 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 379 if (kcp->client->cl_auth == NULL) { 380 clnt_destroy(kcp->client); 381 kcp->client = NULL; 382 return (NULL); 383 } 384 385 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 386 wait_time.tv_usec = 0; 387 clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 388 (char *)&wait_time); 389 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 390 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 391 392 return (kcp->client); 393 } 394 395 /* returns 0 on failure, 1 on success */ 396 397 static int 398 key_call(u_long proc, xdrproc_t xdr_arg, void *arg, xdrproc_t xdr_rslt, 399 void *rslt) 400 { 401 CLIENT *clnt; 402 struct timeval wait_time; 403 404 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 405 cryptkeyres *res; 406 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 407 *(cryptkeyres*)rslt = *res; 408 return (1); 409 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 410 cryptkeyres *res; 411 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 412 *(cryptkeyres*)rslt = *res; 413 return (1); 414 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 415 des_block *res; 416 res = (*__key_gendes_LOCAL)(geteuid(), 0); 417 *(des_block*)rslt = *res; 418 return (1); 419 } 420 421 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 422 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 423 (proc == KEY_GET_CONV)) 424 clnt = getkeyserv_handle(2); /* talk to version 2 */ 425 else 426 clnt = getkeyserv_handle(1); /* talk to version 1 */ 427 428 if (clnt == NULL) { 429 return (0); 430 } 431 432 wait_time.tv_sec = TOTAL_TIMEOUT; 433 wait_time.tv_usec = 0; 434 435 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 436 wait_time) == RPC_SUCCESS) { 437 return (1); 438 } else { 439 return (0); 440 } 441 } 442