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