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 * $FreeBSD: src/lib/libc/rpc/key_call.c,v 1.3 2000/01/27 23:06:39 jasone Exp $ 33 * $DragonFly: src/lib/libc/rpc/key_call.c,v 1.5 2005/01/31 22:29:38 dillon Exp $ 34 */ 35 36 #ident "@(#)key_call.c 1.25 94/04/24 SMI" 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 <stdio.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 #include <errno.h> 52 #include <rpc/rpc.h> 53 #include <rpc/auth.h> 54 #include <rpc/auth_unix.h> 55 #include <rpc/key_prot.h> 56 #include <string.h> 57 #include <sys/utsname.h> 58 #include <stdlib.h> 59 #include <signal.h> 60 #include <sys/wait.h> 61 #include <sys/fcntl.h> 62 #include "un-namespace.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) (void) 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)() = 0; 84 cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = 0; 85 des_block *(*__key_gendes_LOCAL)() = 0; 86 87 static int key_call ( u_long, xdrproc_t, char *, xdrproc_t, char * ); 88 89 int 90 key_setsecret(secretkey) 91 const char *secretkey; 92 { 93 keystatus status; 94 95 if (!key_call((u_long) KEY_SET, xdr_keybuf, (char *) secretkey, 96 xdr_keystatus, (char *)&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, xdr_void, (char *)NULL, 121 xdr_key_netstres, (char *) &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(remotename, remotekey, deskey) 133 char *remotename; 134 netobj *remotekey; 135 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, xdr_cryptkeyarg2, (char *)&arg, 144 xdr_cryptkeyres, (char *)&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(remotename, remotekey, deskey) 157 char *remotename; 158 netobj *remotekey; 159 des_block *deskey; 160 { 161 cryptkeyarg2 arg; 162 cryptkeyres res; 163 164 arg.remotename = remotename; 165 arg.remotekey = *remotekey; 166 arg.deskey = *deskey; 167 if (!key_call((u_long)KEY_DECRYPT_PK, xdr_cryptkeyarg2, (char *)&arg, 168 xdr_cryptkeyres, (char *)&res)) { 169 return (-1); 170 } 171 if (res.status != KEY_SUCCESS) { 172 debug("decrypt status is nonzero"); 173 return (-1); 174 } 175 *deskey = res.cryptkeyres_u.deskey; 176 return (0); 177 } 178 179 int 180 key_encryptsession(remotename, deskey) 181 const char *remotename; 182 des_block *deskey; 183 { 184 cryptkeyarg arg; 185 cryptkeyres res; 186 187 arg.remotename = (char *) remotename; 188 arg.deskey = *deskey; 189 if (!key_call((u_long)KEY_ENCRYPT, xdr_cryptkeyarg, (char *)&arg, 190 xdr_cryptkeyres, (char *)&res)) { 191 return (-1); 192 } 193 if (res.status != KEY_SUCCESS) { 194 debug("encrypt status is nonzero"); 195 return (-1); 196 } 197 *deskey = res.cryptkeyres_u.deskey; 198 return (0); 199 } 200 201 int 202 key_decryptsession(remotename, deskey) 203 const char *remotename; 204 des_block *deskey; 205 { 206 cryptkeyarg arg; 207 cryptkeyres res; 208 209 arg.remotename = (char *) remotename; 210 arg.deskey = *deskey; 211 if (!key_call((u_long)KEY_DECRYPT, xdr_cryptkeyarg, (char *)&arg, 212 xdr_cryptkeyres, (char *)&res)) { 213 return (-1); 214 } 215 if (res.status != KEY_SUCCESS) { 216 debug("decrypt status is nonzero"); 217 return (-1); 218 } 219 *deskey = res.cryptkeyres_u.deskey; 220 return (0); 221 } 222 223 int 224 key_gendes(key) 225 des_block *key; 226 { 227 if (!key_call((u_long)KEY_GEN, xdr_void, (char *)NULL, 228 xdr_des_block, (char *)key)) { 229 return (-1); 230 } 231 return (0); 232 } 233 234 int 235 key_setnet(arg) 236 struct netstarg *arg; 237 { 238 keystatus status; 239 240 241 if (!key_call((u_long) KEY_NET_PUT, xdr_key_netstarg, (char *) arg, 242 xdr_keystatus, (char *) &status)){ 243 return (-1); 244 } 245 246 if (status != KEY_SUCCESS) { 247 debug("key_setnet status is nonzero"); 248 return (-1); 249 } 250 return (1); 251 } 252 253 254 int 255 key_get_conv(pkey, deskey) 256 char *pkey; 257 des_block *deskey; 258 { 259 cryptkeyres res; 260 261 if (!key_call((u_long) KEY_GET_CONV, xdr_keybuf, pkey, 262 xdr_cryptkeyres, (char *)&res)) { 263 return (-1); 264 } 265 if (res.status != KEY_SUCCESS) { 266 debug("get_conv status is nonzero"); 267 return (-1); 268 } 269 *deskey = res.cryptkeyres_u.deskey; 270 return (0); 271 } 272 273 struct key_call_private { 274 CLIENT *client; /* Client handle */ 275 pid_t pid; /* process-id at moment of creation */ 276 uid_t uid; /* user-id at last authorization */ 277 }; 278 static struct key_call_private *key_call_private_main = NULL; 279 280 #ifdef foo 281 static void 282 key_call_destroy(void *vp) 283 { 284 struct key_call_private *kcp = (struct key_call_private *)vp; 285 286 if (kcp) { 287 if (kcp->client) 288 clnt_destroy(kcp->client); 289 free(kcp); 290 } 291 } 292 #endif 293 294 /* 295 * Keep the handle cached. This call may be made quite often. 296 */ 297 static CLIENT * 298 getkeyserv_handle(vers) 299 int vers; 300 { 301 struct key_call_private *kcp = key_call_private_main; 302 struct timeval wait_time; 303 int fd; 304 struct sockaddr_un name; 305 int namelen = sizeof(struct sockaddr_un); 306 307 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 308 #define TOTAL_TRIES 5 /* Number of tries */ 309 310 if (kcp == (struct key_call_private *)NULL) { 311 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 312 if (kcp == (struct key_call_private *)NULL) { 313 return ((CLIENT *) NULL); 314 } 315 key_call_private_main = 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 other side closed socket, build handle again */ 327 clnt_control(kcp->client, CLGET_FD, (char *)&fd); 328 if (_getpeername(fd,(struct sockaddr *)&name,&namelen) == -1) { 329 auth_destroy(kcp->client->cl_auth); 330 clnt_destroy(kcp->client); 331 kcp->client = NULL; 332 } 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 } 352 353 if ((kcp->client == (CLIENT *) NULL)) 354 /* Use the AF_UNIX transport */ 355 kcp->client = clnt_create("/var/run/keyservsock", KEY_PROG, 356 vers, "unix"); 357 358 if (kcp->client == (CLIENT *) NULL) { 359 return ((CLIENT *) NULL); 360 } 361 kcp->uid = geteuid(); 362 kcp->pid = getpid(); 363 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 364 if (kcp->client->cl_auth == NULL) { 365 clnt_destroy(kcp->client); 366 kcp->client = NULL; 367 return ((CLIENT *) NULL); 368 } 369 370 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 371 wait_time.tv_usec = 0; 372 (void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 373 (char *)&wait_time); 374 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 375 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 376 377 return (kcp->client); 378 } 379 380 /* returns 0 on failure, 1 on success */ 381 382 static int 383 key_call(proc, xdr_arg, arg, xdr_rslt, rslt) 384 u_long proc; 385 xdrproc_t xdr_arg; 386 char *arg; 387 xdrproc_t xdr_rslt; 388 char *rslt; 389 { 390 CLIENT *clnt; 391 struct timeval wait_time; 392 393 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 394 cryptkeyres *res; 395 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 396 *(cryptkeyres*)rslt = *res; 397 return (1); 398 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 399 cryptkeyres *res; 400 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 401 *(cryptkeyres*)rslt = *res; 402 return (1); 403 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 404 des_block *res; 405 res = (*__key_gendes_LOCAL)(geteuid(), 0); 406 *(des_block*)rslt = *res; 407 return (1); 408 } 409 410 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 411 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 412 (proc == KEY_GET_CONV)) 413 clnt = getkeyserv_handle(2); /* talk to version 2 */ 414 else 415 clnt = getkeyserv_handle(1); /* talk to version 1 */ 416 417 if (clnt == NULL) { 418 return (0); 419 } 420 421 wait_time.tv_sec = TOTAL_TIMEOUT; 422 wait_time.tv_usec = 0; 423 424 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 425 wait_time) == RPC_SUCCESS) { 426 return (1); 427 } else { 428 return (0); 429 } 430 } 431