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 * @(#)key_call.c 1.25 94/04/24 SMI 32 * $FreeBSD: src/lib/libc/rpc/key_call.c,v 1.16 2006/02/27 22:10:59 deischen Exp $ 33 */ 34 35 /* 36 * key_call.c, Interface to keyserver 37 * 38 * setsecretkey(key) - set your secret key 39 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent 40 * decryptsessionkey(agent, deskey) - decrypt ditto 41 * gendeskey(deskey) - generate a secure des key 42 */ 43 44 #include "namespace.h" 45 #include "reentrant.h" 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 #include <errno.h> 50 #include <rpc/rpc.h> 51 #include <rpc/auth.h> 52 #include <rpc/auth_unix.h> 53 #include <rpc/key_prot.h> 54 #include <string.h> 55 #include <netconfig.h> 56 #include <sys/utsname.h> 57 #include <signal.h> 58 #include <sys/wait.h> 59 #include <sys/fcntl.h> 60 #include "un-namespace.h" 61 #include "mt_misc.h" 62 63 64 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */ 65 #define KEY_NRETRY 12 /* number of retries */ 66 67 #ifdef DEBUG 68 #define debug(msg) fprintf(stderr, "%s\n", msg); 69 #else 70 #define debug(msg) 71 #endif /* DEBUG */ 72 73 /* 74 * Hack to allow the keyserver to use AUTH_DES (for authenticated 75 * NIS+ calls, for example). The only functions that get called 76 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes. 77 * 78 * The approach is to have the keyserver fill in pointers to local 79 * implementations of these functions, and to call those in key_call(). 80 */ 81 82 cryptkeyres *(*__key_encryptsession_pk_LOCAL)(uid_t, cryptkeyarg2 *) = NULL; 83 cryptkeyres *(*__key_decryptsession_pk_LOCAL)(uid_t, cryptkeyarg2 *) = NULL; 84 des_block *(*__key_gendes_LOCAL)(uid_t, struct svc_req *) = NULL; 85 86 static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *); 87 88 int key_decryptsession_pk(char *, netobj *, des_block *); 89 int key_encryptsession_pk(char *, netobj *, des_block *); 90 int key_get_conv(char *, des_block *); 91 int key_setnet(struct key_netstarg *); 92 93 int 94 key_setsecret(const char *secretkey) 95 { 96 keystatus status; 97 98 if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf, 99 (void *)secretkey, 100 (xdrproc_t)xdr_keystatus, &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, (xdrproc_t)xdr_void, NULL, 125 (xdrproc_t)xdr_key_netstres, &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(char *remotename, netobj *remotekey, des_block *deskey) 137 { 138 cryptkeyarg2 arg; 139 cryptkeyres res; 140 141 arg.remotename = remotename; 142 arg.remotekey = *remotekey; 143 arg.deskey = *deskey; 144 if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg, 145 (xdrproc_t)xdr_cryptkeyres, &res)) { 146 return (-1); 147 } 148 if (res.status != KEY_SUCCESS) { 149 debug("encrypt status is nonzero"); 150 return (-1); 151 } 152 *deskey = res.cryptkeyres_u.deskey; 153 return (0); 154 } 155 156 int 157 key_decryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey) 158 { 159 cryptkeyarg2 arg; 160 cryptkeyres res; 161 162 arg.remotename = remotename; 163 arg.remotekey = *remotekey; 164 arg.deskey = *deskey; 165 if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg, 166 (xdrproc_t)xdr_cryptkeyres, &res)) { 167 return (-1); 168 } 169 if (res.status != KEY_SUCCESS) { 170 debug("decrypt status is nonzero"); 171 return (-1); 172 } 173 *deskey = res.cryptkeyres_u.deskey; 174 return (0); 175 } 176 177 int 178 key_encryptsession(const char *remotename, des_block *deskey) 179 { 180 cryptkeyarg arg; 181 cryptkeyres res; 182 183 arg.remotename = (char *) remotename; 184 arg.deskey = *deskey; 185 if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg, 186 (xdrproc_t)xdr_cryptkeyres, &res)) { 187 return (-1); 188 } 189 if (res.status != KEY_SUCCESS) { 190 debug("encrypt status is nonzero"); 191 return (-1); 192 } 193 *deskey = res.cryptkeyres_u.deskey; 194 return (0); 195 } 196 197 int 198 key_decryptsession(const char *remotename, des_block *deskey) 199 { 200 cryptkeyarg arg; 201 cryptkeyres res; 202 203 arg.remotename = (char *) remotename; 204 arg.deskey = *deskey; 205 if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg, 206 (xdrproc_t)xdr_cryptkeyres, &res)) { 207 return (-1); 208 } 209 if (res.status != KEY_SUCCESS) { 210 debug("decrypt status is nonzero"); 211 return (-1); 212 } 213 *deskey = res.cryptkeyres_u.deskey; 214 return (0); 215 } 216 217 int 218 key_gendes(des_block *key) 219 { 220 if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL, 221 (xdrproc_t)xdr_des_block, key)) { 222 return (-1); 223 } 224 return (0); 225 } 226 227 int 228 key_setnet(struct key_netstarg *arg) 229 { 230 keystatus status; 231 232 233 if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg, 234 (xdrproc_t)xdr_keystatus, &status)){ 235 return (-1); 236 } 237 238 if (status != KEY_SUCCESS) { 239 debug("key_setnet status is nonzero"); 240 return (-1); 241 } 242 return (1); 243 } 244 245 246 int 247 key_get_conv(char *pkey, des_block *deskey) 248 { 249 cryptkeyres res; 250 251 if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey, 252 (xdrproc_t)xdr_cryptkeyres, &res)) { 253 return (-1); 254 } 255 if (res.status != KEY_SUCCESS) { 256 debug("get_conv status is nonzero"); 257 return (-1); 258 } 259 *deskey = res.cryptkeyres_u.deskey; 260 return (0); 261 } 262 263 struct key_call_private { 264 CLIENT *client; /* Client handle */ 265 pid_t pid; /* process-id at moment of creation */ 266 uid_t uid; /* user-id at last authorization */ 267 }; 268 static struct key_call_private *key_call_private_main = NULL; 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 /* 283 * Keep the handle cached. This call may be made quite often. 284 */ 285 static CLIENT * 286 getkeyserv_handle(int vers) 287 { 288 void *localhandle; 289 struct netconfig *nconf; 290 struct netconfig *tpconf; 291 struct key_call_private *kcp = key_call_private_main; 292 struct timeval wait_time; 293 struct utsname u; 294 int main_thread; 295 int fd; 296 static thread_key_t key_call_key; 297 298 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 299 #define TOTAL_TRIES 5 /* Number of tries */ 300 301 if ((main_thread = thr_main())) { 302 kcp = key_call_private_main; 303 } else { 304 if (key_call_key == 0) { 305 mutex_lock(&tsd_lock); 306 if (key_call_key == 0) 307 thr_keycreate(&key_call_key, key_call_destroy); 308 mutex_unlock(&tsd_lock); 309 } 310 kcp = (struct key_call_private *)thr_getspecific(key_call_key); 311 } 312 if (kcp == NULL) { 313 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 314 if (kcp == NULL) { 315 return (NULL); 316 } 317 if (main_thread) 318 key_call_private_main = kcp; 319 else 320 thr_setspecific(key_call_key, (void *) kcp); 321 kcp->client = NULL; 322 } 323 324 /* if pid has changed, destroy client and rebuild */ 325 if (kcp->client != NULL && kcp->pid != getpid()) { 326 clnt_destroy(kcp->client); 327 kcp->client = NULL; 328 } 329 330 if (kcp->client != NULL) { 331 /* if uid has changed, build client handle again */ 332 if (kcp->uid != geteuid()) { 333 kcp->uid = geteuid(); 334 auth_destroy(kcp->client->cl_auth); 335 kcp->client->cl_auth = 336 authsys_create("", kcp->uid, 0, 0, NULL); 337 if (kcp->client->cl_auth == NULL) { 338 clnt_destroy(kcp->client); 339 kcp->client = NULL; 340 return (NULL); 341 } 342 } 343 /* Change the version number to the new one */ 344 clnt_control(kcp->client, CLSET_VERS, (void *)&vers); 345 return (kcp->client); 346 } 347 if (!(localhandle = setnetconfig())) { 348 return (NULL); 349 } 350 tpconf = NULL; 351 if (uname(&u) == -1) 352 { 353 endnetconfig(localhandle); 354 return (NULL); 355 } 356 while ((nconf = getnetconfig(localhandle)) != NULL) { 357 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) { 358 /* 359 * We use COTS_ORD here so that the caller can 360 * find out immediately if the server is dead. 361 */ 362 if (nconf->nc_semantics == NC_TPI_COTS_ORD) { 363 kcp->client = clnt_tp_create(u.nodename, 364 KEY_PROG, vers, nconf); 365 if (kcp->client) 366 break; 367 } else { 368 tpconf = nconf; 369 } 370 } 371 } 372 if ((kcp->client == NULL) && (tpconf)) 373 /* Now, try the CLTS or COTS loopback transport */ 374 kcp->client = clnt_tp_create(u.nodename, 375 KEY_PROG, vers, tpconf); 376 endnetconfig(localhandle); 377 378 if (kcp->client == NULL) { 379 return (NULL); 380 } 381 kcp->uid = geteuid(); 382 kcp->pid = getpid(); 383 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 384 if (kcp->client->cl_auth == NULL) { 385 clnt_destroy(kcp->client); 386 kcp->client = NULL; 387 return (NULL); 388 } 389 390 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 391 wait_time.tv_usec = 0; 392 clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 393 (char *)&wait_time); 394 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 395 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 396 397 return (kcp->client); 398 } 399 400 /* returns 0 on failure, 1 on success */ 401 402 static int 403 key_call(u_long proc, xdrproc_t xdr_arg, void *arg, xdrproc_t xdr_rslt, 404 void *rslt) 405 { 406 CLIENT *clnt; 407 struct timeval wait_time; 408 409 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 410 cryptkeyres *res; 411 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 412 *(cryptkeyres*)rslt = *res; 413 return (1); 414 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 415 cryptkeyres *res; 416 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 417 *(cryptkeyres*)rslt = *res; 418 return (1); 419 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 420 des_block *res; 421 res = (*__key_gendes_LOCAL)(geteuid(), 0); 422 *(des_block*)rslt = *res; 423 return (1); 424 } 425 426 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 427 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 428 (proc == KEY_GET_CONV)) 429 clnt = getkeyserv_handle(2); /* talk to version 2 */ 430 else 431 clnt = getkeyserv_handle(1); /* talk to version 1 */ 432 433 if (clnt == NULL) { 434 return (0); 435 } 436 437 wait_time.tv_sec = TOTAL_TIMEOUT; 438 wait_time.tv_usec = 0; 439 440 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 441 wait_time) == RPC_SUCCESS) { 442 return (1); 443 } else { 444 return (0); 445 } 446 } 447