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 */ 34 35 #ident "@(#)key_call.c 1.25 94/04/24 SMI" 36 37 /* 38 * key_call.c, Interface to keyserver 39 * 40 * setsecretkey(key) - set your secret key 41 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent 42 * decryptsessionkey(agent, deskey) - decrypt ditto 43 * gendeskey(deskey) - generate a secure des key 44 */ 45 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 <sys/utsname.h> 56 #include <stdlib.h> 57 #include <signal.h> 58 #include <sys/wait.h> 59 #include <sys/fcntl.h> 60 61 62 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */ 63 #define KEY_NRETRY 12 /* number of retries */ 64 65 #ifdef DEBUG 66 #define debug(msg) (void) fprintf(stderr, "%s\n", msg); 67 #else 68 #define debug(msg) 69 #endif /* DEBUG */ 70 71 /* 72 * Hack to allow the keyserver to use AUTH_DES (for authenticated 73 * NIS+ calls, for example). The only functions that get called 74 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes. 75 * 76 * The approach is to have the keyserver fill in pointers to local 77 * implementations of these functions, and to call those in key_call(). 78 */ 79 80 cryptkeyres *(*__key_encryptsession_pk_LOCAL)() = 0; 81 cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = 0; 82 des_block *(*__key_gendes_LOCAL)() = 0; 83 84 static int key_call __P(( u_long, xdrproc_t, char *, xdrproc_t, char * )); 85 86 int 87 key_setsecret(secretkey) 88 const char *secretkey; 89 { 90 keystatus status; 91 92 if (!key_call((u_long) KEY_SET, xdr_keybuf, (char *) secretkey, 93 xdr_keystatus, (char *)&status)) { 94 return (-1); 95 } 96 if (status != KEY_SUCCESS) { 97 debug("set status is nonzero"); 98 return (-1); 99 } 100 return (0); 101 } 102 103 104 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key 105 * stored for the caller's effective uid; it returns 0 otherwise 106 * 107 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't 108 * be using it, because it allows them to get the user's secret key. 109 */ 110 111 int 112 key_secretkey_is_set(void) 113 { 114 struct key_netstres kres; 115 116 memset((void*)&kres, 0, sizeof (kres)); 117 if (key_call((u_long) KEY_NET_GET, xdr_void, (char *)NULL, 118 xdr_key_netstres, (char *) &kres) && 119 (kres.status == KEY_SUCCESS) && 120 (kres.key_netstres_u.knet.st_priv_key[0] != 0)) { 121 /* avoid leaving secret key in memory */ 122 memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES); 123 return (1); 124 } 125 return (0); 126 } 127 128 int 129 key_encryptsession_pk(remotename, remotekey, deskey) 130 char *remotename; 131 netobj *remotekey; 132 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, xdr_cryptkeyarg2, (char *)&arg, 141 xdr_cryptkeyres, (char *)&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(remotename, remotekey, deskey) 154 char *remotename; 155 netobj *remotekey; 156 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, xdr_cryptkeyarg2, (char *)&arg, 165 xdr_cryptkeyres, (char *)&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(remotename, deskey) 178 const char *remotename; 179 des_block *deskey; 180 { 181 cryptkeyarg arg; 182 cryptkeyres res; 183 184 arg.remotename = (char *) remotename; 185 arg.deskey = *deskey; 186 if (!key_call((u_long)KEY_ENCRYPT, xdr_cryptkeyarg, (char *)&arg, 187 xdr_cryptkeyres, (char *)&res)) { 188 return (-1); 189 } 190 if (res.status != KEY_SUCCESS) { 191 debug("encrypt status is nonzero"); 192 return (-1); 193 } 194 *deskey = res.cryptkeyres_u.deskey; 195 return (0); 196 } 197 198 int 199 key_decryptsession(remotename, deskey) 200 const char *remotename; 201 des_block *deskey; 202 { 203 cryptkeyarg arg; 204 cryptkeyres res; 205 206 arg.remotename = (char *) remotename; 207 arg.deskey = *deskey; 208 if (!key_call((u_long)KEY_DECRYPT, xdr_cryptkeyarg, (char *)&arg, 209 xdr_cryptkeyres, (char *)&res)) { 210 return (-1); 211 } 212 if (res.status != KEY_SUCCESS) { 213 debug("decrypt status is nonzero"); 214 return (-1); 215 } 216 *deskey = res.cryptkeyres_u.deskey; 217 return (0); 218 } 219 220 int 221 key_gendes(key) 222 des_block *key; 223 { 224 if (!key_call((u_long)KEY_GEN, xdr_void, (char *)NULL, 225 xdr_des_block, (char *)key)) { 226 return (-1); 227 } 228 return (0); 229 } 230 231 int 232 key_setnet(arg) 233 struct netstarg *arg; 234 { 235 keystatus status; 236 237 238 if (!key_call((u_long) KEY_NET_PUT, xdr_key_netstarg, (char *) arg, 239 xdr_keystatus, (char *) &status)){ 240 return (-1); 241 } 242 243 if (status != KEY_SUCCESS) { 244 debug("key_setnet status is nonzero"); 245 return (-1); 246 } 247 return (1); 248 } 249 250 251 int 252 key_get_conv(pkey, deskey) 253 char *pkey; 254 des_block *deskey; 255 { 256 cryptkeyres res; 257 258 if (!key_call((u_long) KEY_GET_CONV, xdr_keybuf, pkey, 259 xdr_cryptkeyres, (char *)&res)) { 260 return (-1); 261 } 262 if (res.status != KEY_SUCCESS) { 263 debug("get_conv status is nonzero"); 264 return (-1); 265 } 266 *deskey = res.cryptkeyres_u.deskey; 267 return (0); 268 } 269 270 struct key_call_private { 271 CLIENT *client; /* Client handle */ 272 pid_t pid; /* process-id at moment of creation */ 273 uid_t uid; /* user-id at last authorization */ 274 }; 275 static struct key_call_private *key_call_private_main = NULL; 276 277 #ifdef foo 278 static void 279 key_call_destroy(void *vp) 280 { 281 register struct key_call_private *kcp = (struct key_call_private *)vp; 282 283 if (kcp) { 284 if (kcp->client) 285 clnt_destroy(kcp->client); 286 free(kcp); 287 } 288 } 289 #endif 290 291 /* 292 * Keep the handle cached. This call may be made quite often. 293 */ 294 static CLIENT * 295 getkeyserv_handle(vers) 296 int vers; 297 { 298 struct key_call_private *kcp = key_call_private_main; 299 struct timeval wait_time; 300 int fd; 301 struct sockaddr_un name; 302 int namelen = sizeof(struct sockaddr_un); 303 304 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 305 #define TOTAL_TRIES 5 /* Number of tries */ 306 307 if (kcp == (struct key_call_private *)NULL) { 308 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 309 if (kcp == (struct key_call_private *)NULL) { 310 return ((CLIENT *) NULL); 311 } 312 key_call_private_main = kcp; 313 kcp->client = NULL; 314 } 315 316 /* if pid has changed, destroy client and rebuild */ 317 if (kcp->client != NULL && kcp->pid != getpid()) { 318 clnt_destroy(kcp->client); 319 kcp->client = NULL; 320 } 321 322 if (kcp->client != NULL) { 323 /* if other side closed socket, build handle again */ 324 clnt_control(kcp->client, CLGET_FD, (char *)&fd); 325 if (getpeername(fd,(struct sockaddr *)&name,&namelen) == -1) { 326 auth_destroy(kcp->client->cl_auth); 327 clnt_destroy(kcp->client); 328 kcp->client = NULL; 329 } 330 } 331 332 if (kcp->client != NULL) { 333 /* if uid has changed, build client handle again */ 334 if (kcp->uid != geteuid()) { 335 kcp->uid = geteuid(); 336 auth_destroy(kcp->client->cl_auth); 337 kcp->client->cl_auth = 338 authsys_create("", kcp->uid, 0, 0, NULL); 339 if (kcp->client->cl_auth == NULL) { 340 clnt_destroy(kcp->client); 341 kcp->client = NULL; 342 return ((CLIENT *) NULL); 343 } 344 } 345 /* Change the version number to the new one */ 346 clnt_control(kcp->client, CLSET_VERS, (void *)&vers); 347 return (kcp->client); 348 } 349 350 if ((kcp->client == (CLIENT *) NULL)) 351 /* Use the AF_UNIX transport */ 352 kcp->client = clnt_create("/var/run/keyservsock", KEY_PROG, 353 vers, "unix"); 354 355 if (kcp->client == (CLIENT *) NULL) { 356 return ((CLIENT *) NULL); 357 } 358 kcp->uid = geteuid(); 359 kcp->pid = getpid(); 360 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 361 if (kcp->client->cl_auth == NULL) { 362 clnt_destroy(kcp->client); 363 kcp->client = NULL; 364 return ((CLIENT *) NULL); 365 } 366 367 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 368 wait_time.tv_usec = 0; 369 (void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 370 (char *)&wait_time); 371 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 372 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 373 374 return (kcp->client); 375 } 376 377 /* returns 0 on failure, 1 on success */ 378 379 static int 380 key_call(proc, xdr_arg, arg, xdr_rslt, rslt) 381 u_long proc; 382 xdrproc_t xdr_arg; 383 char *arg; 384 xdrproc_t xdr_rslt; 385 char *rslt; 386 { 387 CLIENT *clnt; 388 struct timeval wait_time; 389 390 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 391 cryptkeyres *res; 392 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 393 *(cryptkeyres*)rslt = *res; 394 return (1); 395 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 396 cryptkeyres *res; 397 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 398 *(cryptkeyres*)rslt = *res; 399 return (1); 400 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 401 des_block *res; 402 res = (*__key_gendes_LOCAL)(geteuid(), 0); 403 *(des_block*)rslt = *res; 404 return (1); 405 } 406 407 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 408 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 409 (proc == KEY_GET_CONV)) 410 clnt = getkeyserv_handle(2); /* talk to version 2 */ 411 else 412 clnt = getkeyserv_handle(1); /* talk to version 1 */ 413 414 if (clnt == NULL) { 415 return (0); 416 } 417 418 wait_time.tv_sec = TOTAL_TIMEOUT; 419 wait_time.tv_usec = 0; 420 421 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 422 wait_time) == RPC_SUCCESS) { 423 return (1); 424 } else { 425 return (0); 426 } 427 } 428