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31 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
34 #ident "@(#)key_call.c 1.25 94/04/24 SMI"
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 * key_call.c, Interface to keyserver
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
47 #include "namespace.h"
48 #include "reentrant.h"
55 #include <rpc/auth_unix.h>
56 #include <rpc/key_prot.h>
58 #include <netconfig.h>
59 #include <sys/utsname.h>
63 #include <sys/fcntl.h>
64 #include "un-namespace.h"
68 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */
69 #define KEY_NRETRY 12 /* number of retries */
72 #define debug(msg) (void) fprintf(stderr, "%s\n", msg);
78 * Hack to allow the keyserver to use AUTH_DES (for authenticated
79 * NIS+ calls, for example). The only functions that get called
80 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes.
82 * The approach is to have the keyserver fill in pointers to local
83 * implementations of these functions, and to call those in key_call().
86 cryptkeyres *(*__key_encryptsession_pk_LOCAL)(uid_t, void *arg) = 0;
87 cryptkeyres *(*__key_decryptsession_pk_LOCAL)(uid_t, void *arg) = 0;
88 des_block *(*__key_gendes_LOCAL)(uid_t, void *) = 0;
90 static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *);
93 key_setsecret(const char *secretkey)
97 if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf,
99 (xdrproc_t)xdr_keystatus, &status)) {
102 if (status != KEY_SUCCESS) {
103 debug("set status is nonzero");
110 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key
111 * stored for the caller's effective uid; it returns 0 otherwise
113 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't
114 * be using it, because it allows them to get the user's secret key.
118 key_secretkey_is_set(void)
120 struct key_netstres kres;
122 memset((void*)&kres, 0, sizeof (kres));
123 if (key_call((u_long) KEY_NET_GET, (xdrproc_t)xdr_void, NULL,
124 (xdrproc_t)xdr_key_netstres, &kres) &&
125 (kres.status == KEY_SUCCESS) &&
126 (kres.key_netstres_u.knet.st_priv_key[0] != 0)) {
127 /* avoid leaving secret key in memory */
128 memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES);
135 key_encryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey)
140 arg.remotename = remotename;
141 arg.remotekey = *remotekey;
142 arg.deskey = *deskey;
143 if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
144 (xdrproc_t)xdr_cryptkeyres, &res)) {
147 if (res.status != KEY_SUCCESS) {
148 debug("encrypt status is nonzero");
151 *deskey = res.cryptkeyres_u.deskey;
156 key_decryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey)
161 arg.remotename = remotename;
162 arg.remotekey = *remotekey;
163 arg.deskey = *deskey;
164 if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
165 (xdrproc_t)xdr_cryptkeyres, &res)) {
168 if (res.status != KEY_SUCCESS) {
169 debug("decrypt status is nonzero");
172 *deskey = res.cryptkeyres_u.deskey;
177 key_encryptsession(const char *remotename, des_block *deskey)
182 arg.remotename = (char *) remotename;
183 arg.deskey = *deskey;
184 if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
185 (xdrproc_t)xdr_cryptkeyres, &res)) {
188 if (res.status != KEY_SUCCESS) {
189 debug("encrypt status is nonzero");
192 *deskey = res.cryptkeyres_u.deskey;
197 key_decryptsession(const char *remotename, des_block *deskey)
202 arg.remotename = (char *) remotename;
203 arg.deskey = *deskey;
204 if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
205 (xdrproc_t)xdr_cryptkeyres, &res)) {
208 if (res.status != KEY_SUCCESS) {
209 debug("decrypt status is nonzero");
212 *deskey = res.cryptkeyres_u.deskey;
217 key_gendes(des_block *key)
219 if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL,
220 (xdrproc_t)xdr_des_block, key)) {
227 key_setnet(struct key_netstarg *arg)
232 if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg,
233 (xdrproc_t)xdr_keystatus, &status)){
237 if (status != KEY_SUCCESS) {
238 debug("key_setnet status is nonzero");
246 key_get_conv(char *pkey, des_block *deskey)
250 if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey,
251 (xdrproc_t)xdr_cryptkeyres, &res)) {
254 if (res.status != KEY_SUCCESS) {
255 debug("get_conv status is nonzero");
258 *deskey = res.cryptkeyres_u.deskey;
262 struct key_call_private {
263 CLIENT *client; /* Client handle */
264 pid_t pid; /* process-id at moment of creation */
265 uid_t uid; /* user-id at last authorization */
267 static struct key_call_private *key_call_private_main = NULL;
268 static thread_key_t key_call_key;
269 static once_t key_call_once = ONCE_INITIALIZER;
270 static int key_call_key_error;
273 key_call_destroy(void *vp)
275 struct key_call_private *kcp = (struct key_call_private *)vp;
279 clnt_destroy(kcp->client);
288 key_call_key_error = thr_keycreate(&key_call_key, key_call_destroy);
292 * Keep the handle cached. This call may be made quite often.
295 getkeyserv_handle(int vers)
298 struct netconfig *nconf;
299 struct netconfig *tpconf;
300 struct key_call_private *kcp;
301 struct timeval wait_time;
306 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */
307 #define TOTAL_TRIES 5 /* Number of tries */
309 if ((main_thread = thr_main())) {
310 kcp = key_call_private_main;
312 if (thr_once(&key_call_once, key_call_init) != 0 ||
313 key_call_key_error != 0)
314 return ((CLIENT *) NULL);
315 kcp = (struct key_call_private *)thr_getspecific(key_call_key);
317 if (kcp == (struct key_call_private *)NULL) {
318 kcp = (struct key_call_private *)malloc(sizeof (*kcp));
319 if (kcp == (struct key_call_private *)NULL) {
320 return ((CLIENT *) NULL);
323 key_call_private_main = kcp;
325 thr_setspecific(key_call_key, (void *) kcp);
329 /* if pid has changed, destroy client and rebuild */
330 if (kcp->client != NULL && kcp->pid != getpid()) {
331 clnt_destroy(kcp->client);
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);
345 return ((CLIENT *) NULL);
348 /* Change the version number to the new one */
349 clnt_control(kcp->client, CLSET_VERS, (void *)&vers);
350 return (kcp->client);
352 if (!(localhandle = setnetconfig())) {
353 return ((CLIENT *) NULL);
356 #if defined(__FreeBSD__)
360 if (_nuname(&u) == -1)
362 if (_uname(&u) == -1)
364 #error Unknown architecture!
368 endnetconfig(localhandle);
369 return ((CLIENT *) NULL);
371 while ((nconf = getnetconfig(localhandle)) != NULL) {
372 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
374 * We use COTS_ORD here so that the caller can
375 * find out immediately if the server is dead.
377 if (nconf->nc_semantics == NC_TPI_COTS_ORD) {
378 kcp->client = clnt_tp_create(u.nodename,
379 KEY_PROG, vers, nconf);
387 if ((kcp->client == (CLIENT *) NULL) && (tpconf))
388 /* Now, try the CLTS or COTS loopback transport */
389 kcp->client = clnt_tp_create(u.nodename,
390 KEY_PROG, vers, tpconf);
391 endnetconfig(localhandle);
393 if (kcp->client == (CLIENT *) NULL) {
394 return ((CLIENT *) NULL);
396 kcp->uid = geteuid();
398 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL);
399 if (kcp->client->cl_auth == NULL) {
400 clnt_destroy(kcp->client);
402 return ((CLIENT *) NULL);
405 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES;
406 wait_time.tv_usec = 0;
407 (void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT,
409 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd))
410 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */
412 return (kcp->client);
415 /* returns 0 on failure, 1 on success */
418 key_call(u_long proc, xdrproc_t xdr_arg, void *arg, xdrproc_t xdr_rslt,
422 struct timeval wait_time;
424 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) {
426 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg);
427 *(cryptkeyres*)rslt = *res;
429 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) {
431 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg);
432 *(cryptkeyres*)rslt = *res;
434 } else if (proc == KEY_GEN && __key_gendes_LOCAL) {
436 res = (*__key_gendes_LOCAL)(geteuid(), 0);
437 *(des_block*)rslt = *res;
441 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) ||
442 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) ||
443 (proc == KEY_GET_CONV))
444 clnt = getkeyserv_handle(2); /* talk to version 2 */
446 clnt = getkeyserv_handle(1); /* talk to version 1 */
452 wait_time.tv_sec = TOTAL_TIMEOUT;
453 wait_time.tv_usec = 0;
455 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt,
456 wait_time) == RPC_SUCCESS) {