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 1.6 2005/11/13 12:27:04 swildner 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) 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(const char *secretkey) 91 { 92 keystatus status; 93 94 if (!key_call((u_long) KEY_SET, xdr_keybuf, (char *) secretkey, 95 xdr_keystatus, (char *)&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, xdr_void, (char *)NULL, 120 xdr_key_netstres, (char *) &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, xdr_cryptkeyarg2, (char *)&arg, 140 xdr_cryptkeyres, (char *)&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, xdr_cryptkeyarg2, (char *)&arg, 161 xdr_cryptkeyres, (char *)&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, xdr_cryptkeyarg, (char *)&arg, 181 xdr_cryptkeyres, (char *)&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, xdr_cryptkeyarg, (char *)&arg, 201 xdr_cryptkeyres, (char *)&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, xdr_void, (char *)NULL, 216 xdr_des_block, (char *)key)) { 217 return (-1); 218 } 219 return (0); 220 } 221 222 int 223 key_setnet(struct netstarg *arg) 224 { 225 keystatus status; 226 227 228 if (!key_call((u_long) KEY_NET_PUT, xdr_key_netstarg, (char *) arg, 229 xdr_keystatus, (char *) &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, xdr_keybuf, pkey, 247 xdr_cryptkeyres, (char *)&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; 264 265 #ifdef foo 266 static void 267 key_call_destroy(void *vp) 268 { 269 struct key_call_private *kcp = (struct key_call_private *)vp; 270 271 if (kcp) { 272 if (kcp->client) 273 clnt_destroy(kcp->client); 274 free(kcp); 275 } 276 } 277 #endif 278 279 /* 280 * Keep the handle cached. This call may be made quite often. 281 */ 282 static CLIENT * 283 getkeyserv_handle(int vers) 284 { 285 struct key_call_private *kcp = key_call_private_main; 286 struct timeval wait_time; 287 int fd; 288 struct sockaddr_un name; 289 int namelen = sizeof(struct sockaddr_un); 290 291 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 292 #define TOTAL_TRIES 5 /* Number of tries */ 293 294 if (kcp == (struct key_call_private *)NULL) { 295 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 296 if (kcp == (struct key_call_private *)NULL) { 297 return ((CLIENT *) NULL); 298 } 299 key_call_private_main = kcp; 300 kcp->client = NULL; 301 } 302 303 /* if pid has changed, destroy client and rebuild */ 304 if (kcp->client != NULL && kcp->pid != getpid()) { 305 clnt_destroy(kcp->client); 306 kcp->client = NULL; 307 } 308 309 if (kcp->client != NULL) { 310 /* if other side closed socket, build handle again */ 311 clnt_control(kcp->client, CLGET_FD, (char *)&fd); 312 if (_getpeername(fd,(struct sockaddr *)&name,&namelen) == -1) { 313 auth_destroy(kcp->client->cl_auth); 314 clnt_destroy(kcp->client); 315 kcp->client = NULL; 316 } 317 } 318 319 if (kcp->client != NULL) { 320 /* if uid has changed, build client handle again */ 321 if (kcp->uid != geteuid()) { 322 kcp->uid = geteuid(); 323 auth_destroy(kcp->client->cl_auth); 324 kcp->client->cl_auth = 325 authsys_create("", kcp->uid, 0, 0, NULL); 326 if (kcp->client->cl_auth == NULL) { 327 clnt_destroy(kcp->client); 328 kcp->client = NULL; 329 return ((CLIENT *) NULL); 330 } 331 } 332 /* Change the version number to the new one */ 333 clnt_control(kcp->client, CLSET_VERS, (void *)&vers); 334 return (kcp->client); 335 } 336 337 if ((kcp->client == (CLIENT *) NULL)) 338 /* Use the AF_UNIX transport */ 339 kcp->client = clnt_create("/var/run/keyservsock", KEY_PROG, 340 vers, "unix"); 341 342 if (kcp->client == (CLIENT *) NULL) { 343 return ((CLIENT *) NULL); 344 } 345 kcp->uid = geteuid(); 346 kcp->pid = getpid(); 347 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 348 if (kcp->client->cl_auth == NULL) { 349 clnt_destroy(kcp->client); 350 kcp->client = NULL; 351 return ((CLIENT *) NULL); 352 } 353 354 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 355 wait_time.tv_usec = 0; 356 clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 357 (char *)&wait_time); 358 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 359 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 360 361 return (kcp->client); 362 } 363 364 /* returns 0 on failure, 1 on success */ 365 366 static int 367 key_call(u_long proc, xdrproc_t xdr_arg, char *arg, xdrproc_t xdr_rslt, 368 char *rslt) 369 { 370 CLIENT *clnt; 371 struct timeval wait_time; 372 373 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 374 cryptkeyres *res; 375 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 376 *(cryptkeyres*)rslt = *res; 377 return (1); 378 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 379 cryptkeyres *res; 380 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 381 *(cryptkeyres*)rslt = *res; 382 return (1); 383 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 384 des_block *res; 385 res = (*__key_gendes_LOCAL)(geteuid(), 0); 386 *(des_block*)rslt = *res; 387 return (1); 388 } 389 390 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 391 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 392 (proc == KEY_GET_CONV)) 393 clnt = getkeyserv_handle(2); /* talk to version 2 */ 394 else 395 clnt = getkeyserv_handle(1); /* talk to version 1 */ 396 397 if (clnt == NULL) { 398 return (0); 399 } 400 401 wait_time.tv_sec = TOTAL_TIMEOUT; 402 wait_time.tv_usec = 0; 403 404 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 405 wait_time) == RPC_SUCCESS) { 406 return (1); 407 } else { 408 return (0); 409 } 410 } 411