1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 /* 31 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 32 */ 33 34 #ident "@(#)key_call.c 1.25 94/04/24 SMI" 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 /* 39 * key_call.c, Interface to keyserver 40 * 41 * setsecretkey(key) - set your secret key 42 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent 43 * decryptsessionkey(agent, deskey) - decrypt ditto 44 * gendeskey(deskey) - generate a secure des key 45 */ 46 47 #include "namespace.h" 48 #include "reentrant.h" 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 #include <errno.h> 53 #include <rpc/rpc.h> 54 #include <rpc/auth.h> 55 #include <rpc/auth_unix.h> 56 #include <rpc/key_prot.h> 57 #include <string.h> 58 #include <netconfig.h> 59 #include <sys/utsname.h> 60 #include <stdlib.h> 61 #include <signal.h> 62 #include <sys/wait.h> 63 #include <sys/fcntl.h> 64 #include "un-namespace.h" 65 #include "mt_misc.h" 66 67 68 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */ 69 #define KEY_NRETRY 12 /* number of retries */ 70 71 #ifdef DEBUG 72 #define debug(msg) (void) fprintf(stderr, "%s\n", msg); 73 #else 74 #define debug(msg) 75 #endif /* DEBUG */ 76 77 /* 78 * Hack to allow the keyserver to use AUTH_DES (for authenticated 79 * NIS+ calls, for example). The only functions that get called 80 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes. 81 * 82 * The approach is to have the keyserver fill in pointers to local 83 * implementations of these functions, and to call those in key_call(). 84 */ 85 86 cryptkeyres *(*__key_encryptsession_pk_LOCAL)(uid_t, void *arg) = 0; 87 cryptkeyres *(*__key_decryptsession_pk_LOCAL)(uid_t, void *arg) = 0; 88 des_block *(*__key_gendes_LOCAL)(uid_t, void *) = 0; 89 90 static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *); 91 92 int 93 key_setsecret(const char *secretkey) 94 { 95 keystatus status; 96 97 if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf, 98 (void *)secretkey, 99 (xdrproc_t)xdr_keystatus, &status)) { 100 return (-1); 101 } 102 if (status != KEY_SUCCESS) { 103 debug("set status is nonzero"); 104 return (-1); 105 } 106 return (0); 107 } 108 109 110 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key 111 * stored for the caller's effective uid; it returns 0 otherwise 112 * 113 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't 114 * be using it, because it allows them to get the user's secret key. 115 */ 116 117 int 118 key_secretkey_is_set(void) 119 { 120 struct key_netstres kres; 121 122 memset((void*)&kres, 0, sizeof (kres)); 123 if (key_call((u_long) KEY_NET_GET, (xdrproc_t)xdr_void, NULL, 124 (xdrproc_t)xdr_key_netstres, &kres) && 125 (kres.status == KEY_SUCCESS) && 126 (kres.key_netstres_u.knet.st_priv_key[0] != 0)) { 127 /* avoid leaving secret key in memory */ 128 memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES); 129 return (1); 130 } 131 return (0); 132 } 133 134 int 135 key_encryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey) 136 { 137 cryptkeyarg2 arg; 138 cryptkeyres res; 139 140 arg.remotename = remotename; 141 arg.remotekey = *remotekey; 142 arg.deskey = *deskey; 143 if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg, 144 (xdrproc_t)xdr_cryptkeyres, &res)) { 145 return (-1); 146 } 147 if (res.status != KEY_SUCCESS) { 148 debug("encrypt status is nonzero"); 149 return (-1); 150 } 151 *deskey = res.cryptkeyres_u.deskey; 152 return (0); 153 } 154 155 int 156 key_decryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey) 157 { 158 cryptkeyarg2 arg; 159 cryptkeyres res; 160 161 arg.remotename = remotename; 162 arg.remotekey = *remotekey; 163 arg.deskey = *deskey; 164 if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg, 165 (xdrproc_t)xdr_cryptkeyres, &res)) { 166 return (-1); 167 } 168 if (res.status != KEY_SUCCESS) { 169 debug("decrypt status is nonzero"); 170 return (-1); 171 } 172 *deskey = res.cryptkeyres_u.deskey; 173 return (0); 174 } 175 176 int 177 key_encryptsession(const char *remotename, des_block *deskey) 178 { 179 cryptkeyarg arg; 180 cryptkeyres res; 181 182 arg.remotename = (char *) remotename; 183 arg.deskey = *deskey; 184 if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg, 185 (xdrproc_t)xdr_cryptkeyres, &res)) { 186 return (-1); 187 } 188 if (res.status != KEY_SUCCESS) { 189 debug("encrypt status is nonzero"); 190 return (-1); 191 } 192 *deskey = res.cryptkeyres_u.deskey; 193 return (0); 194 } 195 196 int 197 key_decryptsession(const char *remotename, des_block *deskey) 198 { 199 cryptkeyarg arg; 200 cryptkeyres res; 201 202 arg.remotename = (char *) remotename; 203 arg.deskey = *deskey; 204 if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg, 205 (xdrproc_t)xdr_cryptkeyres, &res)) { 206 return (-1); 207 } 208 if (res.status != KEY_SUCCESS) { 209 debug("decrypt status is nonzero"); 210 return (-1); 211 } 212 *deskey = res.cryptkeyres_u.deskey; 213 return (0); 214 } 215 216 int 217 key_gendes(des_block *key) 218 { 219 if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL, 220 (xdrproc_t)xdr_des_block, key)) { 221 return (-1); 222 } 223 return (0); 224 } 225 226 int 227 key_setnet(struct key_netstarg *arg) 228 { 229 keystatus status; 230 231 232 if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg, 233 (xdrproc_t)xdr_keystatus, &status)){ 234 return (-1); 235 } 236 237 if (status != KEY_SUCCESS) { 238 debug("key_setnet status is nonzero"); 239 return (-1); 240 } 241 return (1); 242 } 243 244 245 int 246 key_get_conv(char *pkey, des_block *deskey) 247 { 248 cryptkeyres res; 249 250 if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey, 251 (xdrproc_t)xdr_cryptkeyres, &res)) { 252 return (-1); 253 } 254 if (res.status != KEY_SUCCESS) { 255 debug("get_conv status is nonzero"); 256 return (-1); 257 } 258 *deskey = res.cryptkeyres_u.deskey; 259 return (0); 260 } 261 262 struct key_call_private { 263 CLIENT *client; /* Client handle */ 264 pid_t pid; /* process-id at moment of creation */ 265 uid_t uid; /* user-id at last authorization */ 266 }; 267 static struct key_call_private *key_call_private_main = NULL; 268 static thread_key_t key_call_key; 269 static once_t key_call_once = ONCE_INITIALIZER; 270 static int key_call_key_error; 271 272 static void 273 key_call_destroy(void *vp) 274 { 275 struct key_call_private *kcp = (struct key_call_private *)vp; 276 277 if (kcp) { 278 if (kcp->client) 279 clnt_destroy(kcp->client); 280 free(kcp); 281 } 282 } 283 284 static void 285 key_call_init(void) 286 { 287 288 key_call_key_error = thr_keycreate(&key_call_key, key_call_destroy); 289 } 290 291 /* 292 * Keep the handle cached. This call may be made quite often. 293 */ 294 static CLIENT * 295 getkeyserv_handle(int vers) 296 { 297 void *localhandle; 298 struct netconfig *nconf; 299 struct netconfig *tpconf; 300 struct key_call_private *kcp; 301 struct timeval wait_time; 302 struct utsname u; 303 int main_thread; 304 int fd; 305 306 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 307 #define TOTAL_TRIES 5 /* Number of tries */ 308 309 if ((main_thread = thr_main())) { 310 kcp = key_call_private_main; 311 } else { 312 if (thr_once(&key_call_once, key_call_init) != 0 || 313 key_call_key_error != 0) 314 return ((CLIENT *) NULL); 315 kcp = (struct key_call_private *)thr_getspecific(key_call_key); 316 } 317 if (kcp == (struct key_call_private *)NULL) { 318 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 319 if (kcp == (struct key_call_private *)NULL) { 320 return ((CLIENT *) NULL); 321 } 322 if (main_thread) 323 key_call_private_main = kcp; 324 else 325 thr_setspecific(key_call_key, (void *) kcp); 326 kcp->client = NULL; 327 } 328 329 /* if pid has changed, destroy client and rebuild */ 330 if (kcp->client != NULL && kcp->pid != getpid()) { 331 clnt_destroy(kcp->client); 332 kcp->client = NULL; 333 } 334 335 if (kcp->client != NULL) { 336 /* if uid has changed, build client handle again */ 337 if (kcp->uid != geteuid()) { 338 kcp->uid = geteuid(); 339 auth_destroy(kcp->client->cl_auth); 340 kcp->client->cl_auth = 341 authsys_create("", kcp->uid, 0, 0, NULL); 342 if (kcp->client->cl_auth == NULL) { 343 clnt_destroy(kcp->client); 344 kcp->client = NULL; 345 return ((CLIENT *) NULL); 346 } 347 } 348 /* Change the version number to the new one */ 349 clnt_control(kcp->client, CLSET_VERS, (void *)&vers); 350 return (kcp->client); 351 } 352 if (!(localhandle = setnetconfig())) { 353 return ((CLIENT *) NULL); 354 } 355 tpconf = NULL; 356 #if defined(__FreeBSD__) 357 if (uname(&u) == -1) 358 #else 359 #if defined(i386) 360 if (_nuname(&u) == -1) 361 #elif defined(sparc) 362 if (_uname(&u) == -1) 363 #else 364 #error Unknown architecture! 365 #endif 366 #endif 367 { 368 endnetconfig(localhandle); 369 return ((CLIENT *) NULL); 370 } 371 while ((nconf = getnetconfig(localhandle)) != NULL) { 372 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) { 373 /* 374 * We use COTS_ORD here so that the caller can 375 * find out immediately if the server is dead. 376 */ 377 if (nconf->nc_semantics == NC_TPI_COTS_ORD) { 378 kcp->client = clnt_tp_create(u.nodename, 379 KEY_PROG, vers, nconf); 380 if (kcp->client) 381 break; 382 } else { 383 tpconf = nconf; 384 } 385 } 386 } 387 if ((kcp->client == (CLIENT *) NULL) && (tpconf)) 388 /* Now, try the CLTS or COTS loopback transport */ 389 kcp->client = clnt_tp_create(u.nodename, 390 KEY_PROG, vers, tpconf); 391 endnetconfig(localhandle); 392 393 if (kcp->client == (CLIENT *) NULL) { 394 return ((CLIENT *) NULL); 395 } 396 kcp->uid = geteuid(); 397 kcp->pid = getpid(); 398 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 399 if (kcp->client->cl_auth == NULL) { 400 clnt_destroy(kcp->client); 401 kcp->client = NULL; 402 return ((CLIENT *) NULL); 403 } 404 405 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 406 wait_time.tv_usec = 0; 407 (void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 408 (char *)&wait_time); 409 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 410 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 411 412 return (kcp->client); 413 } 414 415 /* returns 0 on failure, 1 on success */ 416 417 static int 418 key_call(u_long proc, xdrproc_t xdr_arg, void *arg, xdrproc_t xdr_rslt, 419 void *rslt) 420 { 421 CLIENT *clnt; 422 struct timeval wait_time; 423 424 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 425 cryptkeyres *res; 426 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 427 *(cryptkeyres*)rslt = *res; 428 return (1); 429 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 430 cryptkeyres *res; 431 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 432 *(cryptkeyres*)rslt = *res; 433 return (1); 434 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 435 des_block *res; 436 res = (*__key_gendes_LOCAL)(geteuid(), 0); 437 *(des_block*)rslt = *res; 438 return (1); 439 } 440 441 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 442 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 443 (proc == KEY_GET_CONV)) 444 clnt = getkeyserv_handle(2); /* talk to version 2 */ 445 else 446 clnt = getkeyserv_handle(1); /* talk to version 1 */ 447 448 if (clnt == NULL) { 449 return (0); 450 } 451 452 wait_time.tv_sec = TOTAL_TIMEOUT; 453 wait_time.tv_usec = 0; 454 455 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 456 wait_time) == RPC_SUCCESS) { 457 return (1); 458 } else { 459 return (0); 460 } 461 } 462