2 * Copyright (c) 2010, Oracle America, Inc.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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11 * copyright notice, this list of conditions and the following
12 * disclaimer in the documentation and/or other materials
13 * provided with the distribution.
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15 * contributors may be used to endorse or promote products derived
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 * The original source is from the RPCSRC 4.0 package from Sun Microsystems.
33 * The Interface to keyserver protocoll 2, RPC over AF_UNIX and Linux/doors
34 * was added by Thorsten Kukuk <kukuk@suse.de>
35 * Since the Linux/doors project was stopped, I doubt that this code will
36 * ever be useful <kukuk@suse.de>.
48 #include <sys/param.h>
49 #include <sys/socket.h>
50 #include <rpc/key_prot.h>
51 #include <libc-lock.h>
52 #include <shlib-compat.h>
54 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */
55 #define KEY_NRETRY 12 /* number of retries */
57 #define debug(msg) /* turn off debugging */
60 extern int _openchild (const char *command, FILE **fto, FILE **ffrom);
63 static int key_call (u_long, xdrproc_t xdr_arg, char *,
64 xdrproc_t xdr_rslt, char *) internal_function;
66 static const struct timeval trytimeout = {KEY_TIMEOUT, 0};
67 static const struct timeval tottimeout = {KEY_TIMEOUT *KEY_NRETRY, 0};
70 key_setsecret (char *secretkey)
74 if (!key_call ((u_long) KEY_SET, (xdrproc_t) xdr_keybuf, secretkey,
75 (xdrproc_t) xdr_keystatus, (char *) &status))
77 if (status != KEY_SUCCESS)
79 debug ("set status is nonzero");
84 libc_hidden_nolink_sunrpc (key_setsecret, GLIBC_2_1)
86 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key
87 * stored for the caller's effective uid; it returns 0 otherwise
89 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't
90 * be using it, because it allows them to get the user's secret key.
93 key_secretkey_is_set (void)
95 struct key_netstres kres;
97 memset (&kres, 0, sizeof (kres));
98 if (key_call ((u_long) KEY_NET_GET, (xdrproc_t) xdr_void,
99 (char *) NULL, (xdrproc_t) xdr_key_netstres,
101 (kres.status == KEY_SUCCESS) &&
102 (kres.key_netstres_u.knet.st_priv_key[0] != 0))
104 /* avoid leaving secret key in memory */
105 memset (kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES);
110 #ifdef EXPORT_RPC_SYMBOLS
111 libc_hidden_def (key_secretkey_is_set)
113 libc_hidden_nolink_sunrpc (key_secretkey_is_set, GLIBC_2_1)
117 key_encryptsession (char *remotename, des_block *deskey)
122 arg.remotename = remotename;
123 arg.deskey = *deskey;
124 if (!key_call ((u_long) KEY_ENCRYPT, (xdrproc_t) xdr_cryptkeyarg,
125 (char *) &arg, (xdrproc_t) xdr_cryptkeyres,
129 if (res.status != KEY_SUCCESS)
131 debug ("encrypt status is nonzero");
134 *deskey = res.cryptkeyres_u.deskey;
137 libc_hidden_nolink_sunrpc (key_encryptsession, GLIBC_2_1)
140 key_decryptsession (char *remotename, des_block *deskey)
145 arg.remotename = remotename;
146 arg.deskey = *deskey;
147 if (!key_call ((u_long) KEY_DECRYPT, (xdrproc_t) xdr_cryptkeyarg,
148 (char *) &arg, (xdrproc_t) xdr_cryptkeyres,
151 if (res.status != KEY_SUCCESS)
153 debug ("decrypt status is nonzero");
156 *deskey = res.cryptkeyres_u.deskey;
159 libc_hidden_nolink_sunrpc (key_decryptsession, GLIBC_2_1)
162 key_encryptsession_pk (char *remotename, netobj *remotekey,
168 arg.remotename = remotename;
169 arg.remotekey = *remotekey;
170 arg.deskey = *deskey;
171 if (!key_call ((u_long) KEY_ENCRYPT_PK, (xdrproc_t) xdr_cryptkeyarg2,
172 (char *) &arg, (xdrproc_t) xdr_cryptkeyres,
176 if (res.status != KEY_SUCCESS)
178 debug ("encrypt status is nonzero");
181 *deskey = res.cryptkeyres_u.deskey;
184 libc_hidden_nolink_sunrpc (key_encryptsession_pk, GLIBC_2_1)
187 key_decryptsession_pk (char *remotename, netobj *remotekey,
193 arg.remotename = remotename;
194 arg.remotekey = *remotekey;
195 arg.deskey = *deskey;
196 if (!key_call ((u_long) KEY_DECRYPT_PK, (xdrproc_t) xdr_cryptkeyarg2,
197 (char *) &arg, (xdrproc_t) xdr_cryptkeyres,
201 if (res.status != KEY_SUCCESS)
203 debug ("decrypt status is nonzero");
206 *deskey = res.cryptkeyres_u.deskey;
209 libc_hidden_nolink_sunrpc (key_decryptsession_pk, GLIBC_2_1)
212 key_gendes (des_block *key)
214 struct sockaddr_in sin;
219 sin.sin_family = AF_INET;
221 sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
222 memset (sin.sin_zero, 0, sizeof (sin.sin_zero));
223 socket = RPC_ANYSOCK;
224 client = clntudp_bufcreate (&sin, (u_long) KEY_PROG, (u_long) KEY_VERS,
225 trytimeout, &socket, RPCSMALLMSGSIZE,
230 stat = clnt_call (client, KEY_GEN, (xdrproc_t) xdr_void, NULL,
231 (xdrproc_t) xdr_des_block, (caddr_t) key,
233 clnt_destroy (client);
235 if (stat != RPC_SUCCESS)
240 #ifdef EXPORT_RPC_SYMBOLS
241 libc_hidden_def (key_gendes)
243 libc_hidden_nolink_sunrpc (key_gendes, GLIBC_2_1)
247 key_setnet (struct key_netstarg *arg)
251 if (!key_call ((u_long) KEY_NET_PUT, (xdrproc_t) xdr_key_netstarg,
252 (char *) arg,(xdrproc_t) xdr_keystatus,
256 if (status != KEY_SUCCESS)
258 debug ("key_setnet status is nonzero");
263 libc_hidden_nolink_sunrpc (key_setnet, GLIBC_2_1)
266 key_get_conv (char *pkey, des_block *deskey)
270 if (!key_call ((u_long) KEY_GET_CONV, (xdrproc_t) xdr_keybuf, pkey,
271 (xdrproc_t) xdr_cryptkeyres, (char *) &res))
274 if (res.status != KEY_SUCCESS)
276 debug ("get_conv status is nonzero");
279 *deskey = res.cryptkeyres_u.deskey;
282 libc_hidden_nolink_sunrpc (key_get_conv, GLIBC_2_1)
285 * Hack to allow the keyserver to use AUTH_DES (for authenticated
286 * NIS+ calls, for example). The only functions that get called
287 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes.
289 * The approach is to have the keyserver fill in pointers to local
290 * implementations of these functions, and to call those in key_call().
293 cryptkeyres *(*__key_encryptsession_pk_LOCAL) (uid_t, char *);
294 cryptkeyres *(*__key_decryptsession_pk_LOCAL) (uid_t, char *);
295 des_block *(*__key_gendes_LOCAL) (uid_t, char *);
300 key_call_keyenvoy (u_long proc, xdrproc_t xdr_arg, char *arg,
301 xdrproc_t xdr_rslt, char *rslt)
307 sigset_t oldmask, mask;
313 static const char MESSENGER[] = "/usr/etc/keyenvoy";
317 sigaddset (&mask, SIGCHLD);
318 __sigprocmask (SIG_BLOCK, &mask, &oldmask);
321 * We are going to exec a set-uid program which makes our effective uid
322 * zero, and authenticates us with our real uid. We need to make the
323 * effective uid be the real uid for the setuid program, and
324 * the real uid be the effective uid so that we can change things back.
328 __setreuid (euid, ruid);
329 pid = _openchild (MESSENGER, &fargs, &frslt);
330 __setreuid (ruid, euid);
333 debug ("open_streams");
334 __sigprocmask (SIG_SETMASK, &oldmask, NULL);
337 xdrstdio_create (&xdrargs, fargs, XDR_ENCODE);
338 xdrstdio_create (&xdrrslt, frslt, XDR_DECODE);
340 if (!xdr_u_long (&xdrargs, &proc) || !(*xdr_arg) (&xdrargs, arg))
347 if (success && !(*xdr_rslt) (&xdrrslt, rslt))
355 if (__wait4 (pid, &status, 0, NULL) < 0)
360 if (errno == ECHILD || errno == ESRCH)
371 __sigprocmask (SIG_SETMASK, &oldmask, NULL);
377 struct key_call_private {
378 CLIENT *client; /* Client handle */
379 pid_t pid; /* process-id at moment of creation */
380 uid_t uid; /* user-id at last authorization */
382 #ifdef _RPC_THREAD_SAFE_
383 #define key_call_private_main RPC_THREAD_VARIABLE(key_call_private_s)
385 static struct key_call_private *key_call_private_main;
387 __libc_lock_define_initialized (static, keycall_lock)
390 * Keep the handle cached. This call may be made quite often.
393 getkeyserv_handle (int vers)
395 struct key_call_private *kcp = key_call_private_main;
396 struct timeval wait_time;
398 struct sockaddr_un name;
399 socklen_t namelen = sizeof(struct sockaddr_un);
401 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */
402 #define TOTAL_TRIES 5 /* Number of tries */
404 if (kcp == (struct key_call_private *)NULL)
406 kcp = (struct key_call_private *)malloc (sizeof (*kcp));
407 if (kcp == (struct key_call_private *)NULL)
408 return (CLIENT *) NULL;
410 key_call_private_main = kcp;
414 /* if pid has changed, destroy client and rebuild */
415 if (kcp->client != NULL && kcp->pid != __getpid ())
417 auth_destroy (kcp->client->cl_auth);
418 clnt_destroy (kcp->client);
422 if (kcp->client != NULL)
424 /* if other side closed socket, build handle again */
425 clnt_control (kcp->client, CLGET_FD, (char *)&fd);
426 if (__getpeername (fd,(struct sockaddr *)&name,&namelen) == -1)
428 auth_destroy (kcp->client->cl_auth);
429 clnt_destroy (kcp->client);
434 if (kcp->client != NULL)
436 /* if uid has changed, build client handle again */
437 if (kcp->uid != __geteuid ())
439 kcp->uid = __geteuid ();
440 auth_destroy (kcp->client->cl_auth);
441 kcp->client->cl_auth =
442 authunix_create ((char *)"", kcp->uid, 0, 0, NULL);
443 if (kcp->client->cl_auth == NULL)
445 clnt_destroy (kcp->client);
447 return ((CLIENT *) NULL);
450 /* Change the version number to the new one */
451 clnt_control (kcp->client, CLSET_VERS, (void *)&vers);
455 if ((kcp->client == (CLIENT *) NULL))
456 /* Use the AF_UNIX transport */
457 kcp->client = clnt_create ("/var/run/keyservsock", KEY_PROG, vers, "unix");
459 if (kcp->client == (CLIENT *) NULL)
460 return (CLIENT *) NULL;
462 kcp->uid = __geteuid ();
463 kcp->pid = __getpid ();
464 kcp->client->cl_auth = authunix_create ((char *)"", kcp->uid, 0, 0, NULL);
465 if (kcp->client->cl_auth == NULL)
467 clnt_destroy (kcp->client);
469 return (CLIENT *) NULL;
472 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES;
473 wait_time.tv_usec = 0;
474 clnt_control (kcp->client, CLSET_RETRY_TIMEOUT,
476 if (clnt_control (kcp->client, CLGET_FD, (char *)&fd))
477 __fcntl (fd, F_SETFD, FD_CLOEXEC); /* make it "close on exec" */
482 /* returns 0 on failure, 1 on success */
485 key_call_socket (u_long proc, xdrproc_t xdr_arg, char *arg,
486 xdrproc_t xdr_rslt, char *rslt)
489 struct timeval wait_time;
492 __libc_lock_lock (keycall_lock);
493 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) ||
494 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) ||
495 (proc == KEY_GET_CONV))
496 clnt = getkeyserv_handle(2); /* talk to version 2 */
498 clnt = getkeyserv_handle(1); /* talk to version 1 */
502 wait_time.tv_sec = TOTAL_TIMEOUT;
503 wait_time.tv_usec = 0;
505 if (clnt_call (clnt, proc, xdr_arg, arg, xdr_rslt, rslt,
506 wait_time) == RPC_SUCCESS)
510 __libc_lock_unlock (keycall_lock);
516 /* returns 0 on failure, 1 on success */
519 key_call (u_long proc, xdrproc_t xdr_arg, char *arg,
520 xdrproc_t xdr_rslt, char *rslt)
523 static int use_keyenvoy;
526 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL)
529 res = (*__key_encryptsession_pk_LOCAL) (__geteuid (), arg);
530 *(cryptkeyres *) rslt = *res;
533 else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL)
536 res = (*__key_decryptsession_pk_LOCAL) (__geteuid (), arg);
537 *(cryptkeyres *) rslt = *res;
540 else if (proc == KEY_GEN && __key_gendes_LOCAL)
543 res = (*__key_gendes_LOCAL) (__geteuid (), 0);
544 *(des_block *) rslt = *res;
549 return key_call_socket (proc, xdr_arg, arg, xdr_rslt, rslt);
553 if (key_call_socket (proc, xdr_arg, arg, xdr_rslt, rslt))
557 return key_call_keyenvoy (proc, xdr_arg, arg, xdr_rslt, rslt);
561 #ifdef _RPC_THREAD_SAFE_
563 __rpc_thread_key_cleanup (void)
565 struct key_call_private *kcp = RPC_THREAD_VARIABLE(key_call_private_s);
569 if (kcp->client->cl_auth)
570 auth_destroy (kcp->client->cl_auth);
571 clnt_destroy(kcp->client);
576 #endif /* _RPC_THREAD_SAFE_ */