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 /* 35 * key_call.c, Interface to keyserver 36 * 37 * setsecretkey(key) - set your secret key 38 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent 39 * decryptsessionkey(agent, deskey) - decrypt ditto 40 * gendeskey(deskey) - generate a secure des key 41 */ 42 43 #include "namespace.h" 44 #include "reentrant.h" 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <unistd.h> 48 #include <errno.h> 49 #include <rpc/rpc.h> 50 #include <rpc/auth.h> 51 #include <rpc/auth_unix.h> 52 #include <rpc/key_prot.h> 53 #include <string.h> 54 #include <netconfig.h> 55 #include <sys/utsname.h> 56 #include <stdlib.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) (void) 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, void *arg) = 0; 83 cryptkeyres *(*__key_decryptsession_pk_LOCAL)(uid_t, void *arg) = 0; 84 des_block *(*__key_gendes_LOCAL)(uid_t, void *) = 0; 85 86 static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *); 87 88 int 89 key_setsecret(const char *secretkey) 90 { 91 keystatus status; 92 93 if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf, 94 (void *)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 static thread_key_t key_call_key; 265 static once_t key_call_once = ONCE_INITIALIZER; 266 static int key_call_key_error; 267 268 static void 269 key_call_destroy(void *vp) 270 { 271 struct key_call_private *kcp = (struct key_call_private *)vp; 272 273 if (kcp) { 274 if (kcp->client) 275 clnt_destroy(kcp->client); 276 free(kcp); 277 } 278 } 279 280 static void 281 key_call_init(void) 282 { 283 284 key_call_key_error = thr_keycreate(&key_call_key, key_call_destroy); 285 } 286 287 /* 288 * Keep the handle cached. This call may be made quite often. 289 */ 290 static CLIENT * 291 getkeyserv_handle(int vers) 292 { 293 void *localhandle; 294 struct netconfig *nconf; 295 struct netconfig *tpconf; 296 struct key_call_private *kcp; 297 struct timeval wait_time; 298 struct utsname u; 299 int main_thread; 300 int fd; 301 302 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 303 #define TOTAL_TRIES 5 /* Number of tries */ 304 305 if ((main_thread = thr_main())) { 306 kcp = key_call_private_main; 307 } else { 308 if (thr_once(&key_call_once, key_call_init) != 0 || 309 key_call_key_error != 0) 310 return ((CLIENT *) NULL); 311 kcp = (struct key_call_private *)thr_getspecific(key_call_key); 312 } 313 if (kcp == (struct key_call_private *)NULL) { 314 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 315 if (kcp == (struct key_call_private *)NULL) { 316 return ((CLIENT *) NULL); 317 } 318 if (main_thread) 319 key_call_private_main = kcp; 320 else 321 thr_setspecific(key_call_key, (void *) kcp); 322 kcp->client = NULL; 323 } 324 325 /* if pid has changed, destroy client and rebuild */ 326 if (kcp->client != NULL && kcp->pid != getpid()) { 327 clnt_destroy(kcp->client); 328 kcp->client = NULL; 329 } 330 331 if (kcp->client != NULL) { 332 /* if uid has changed, build client handle again */ 333 if (kcp->uid != geteuid()) { 334 kcp->uid = geteuid(); 335 auth_destroy(kcp->client->cl_auth); 336 kcp->client->cl_auth = 337 authsys_create("", kcp->uid, 0, 0, NULL); 338 if (kcp->client->cl_auth == NULL) { 339 clnt_destroy(kcp->client); 340 kcp->client = NULL; 341 return ((CLIENT *) NULL); 342 } 343 } 344 /* Change the version number to the new one */ 345 clnt_control(kcp->client, CLSET_VERS, (void *)&vers); 346 return (kcp->client); 347 } 348 if (!(localhandle = setnetconfig())) { 349 return ((CLIENT *) NULL); 350 } 351 tpconf = NULL; 352 #if defined(__FreeBSD__) 353 if (uname(&u) == -1) 354 #else 355 #if defined(i386) 356 if (_nuname(&u) == -1) 357 #elif defined(sparc) 358 if (_uname(&u) == -1) 359 #else 360 #error Unknown architecture! 361 #endif 362 #endif 363 { 364 endnetconfig(localhandle); 365 return ((CLIENT *) NULL); 366 } 367 while ((nconf = getnetconfig(localhandle)) != NULL) { 368 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) { 369 /* 370 * We use COTS_ORD here so that the caller can 371 * find out immediately if the server is dead. 372 */ 373 if (nconf->nc_semantics == NC_TPI_COTS_ORD) { 374 kcp->client = clnt_tp_create(u.nodename, 375 KEY_PROG, vers, nconf); 376 if (kcp->client) 377 break; 378 } else { 379 tpconf = nconf; 380 } 381 } 382 } 383 if ((kcp->client == (CLIENT *) NULL) && (tpconf)) 384 /* Now, try the CLTS or COTS loopback transport */ 385 kcp->client = clnt_tp_create(u.nodename, 386 KEY_PROG, vers, tpconf); 387 endnetconfig(localhandle); 388 389 if (kcp->client == (CLIENT *) NULL) { 390 return ((CLIENT *) NULL); 391 } 392 kcp->uid = geteuid(); 393 kcp->pid = getpid(); 394 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 395 if (kcp->client->cl_auth == NULL) { 396 clnt_destroy(kcp->client); 397 kcp->client = NULL; 398 return ((CLIENT *) NULL); 399 } 400 401 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 402 wait_time.tv_usec = 0; 403 (void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 404 (char *)&wait_time); 405 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 406 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 407 408 return (kcp->client); 409 } 410 411 /* returns 0 on failure, 1 on success */ 412 413 static int 414 key_call(u_long proc, xdrproc_t xdr_arg, void *arg, xdrproc_t xdr_rslt, 415 void *rslt) 416 { 417 CLIENT *clnt; 418 struct timeval wait_time; 419 420 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 421 cryptkeyres *res; 422 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 423 *(cryptkeyres*)rslt = *res; 424 return (1); 425 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 426 cryptkeyres *res; 427 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 428 *(cryptkeyres*)rslt = *res; 429 return (1); 430 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 431 des_block *res; 432 res = (*__key_gendes_LOCAL)(geteuid(), 0); 433 *(des_block*)rslt = *res; 434 return (1); 435 } 436 437 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 438 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 439 (proc == KEY_GET_CONV)) 440 clnt = getkeyserv_handle(2); /* talk to version 2 */ 441 else 442 clnt = getkeyserv_handle(1); /* talk to version 1 */ 443 444 if (clnt == NULL) { 445 return (0); 446 } 447 448 wait_time.tv_sec = TOTAL_TIMEOUT; 449 wait_time.tv_usec = 0; 450 451 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 452 wait_time) == RPC_SUCCESS) { 453 return (1); 454 } else { 455 return (0); 456 } 457 } 458