lib/libc/rpc/key_call.c

   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 }