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32 * @(#)key_call.c 1.25 94/04/24 SMI
33 * $FreeBSD: src/lib/libc/rpc/key_call.c,v 1.16 2006/02/27 22:10:59 deischen Exp $
37 * key_call.c, Interface to keyserver
39 * setsecretkey(key) - set your secret key
40 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent
41 * decryptsessionkey(agent, deskey) - decrypt ditto
42 * gendeskey(deskey) - generate a secure des key
45 #include "namespace.h"
46 #include "reentrant.h"
53 #include <rpc/auth_unix.h>
54 #include <rpc/key_prot.h>
56 #include <netconfig.h>
57 #include <sys/utsname.h>
60 #include <sys/fcntl.h>
61 #include "un-namespace.h"
65 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */
66 #define KEY_NRETRY 12 /* number of retries */
69 #define debug(msg) fprintf(stderr, "%s\n", msg);
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.
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().
83 cryptkeyres *(*__key_encryptsession_pk_LOCAL)() = NULL;
84 cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = NULL;
85 des_block *(*__key_gendes_LOCAL)() = NULL;
87 static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *);
90 key_setsecret(const char *secretkey)
94 if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf,
96 (xdrproc_t)xdr_keystatus, &status)) {
99 if (status != KEY_SUCCESS) {
100 debug("set status is nonzero");
107 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key
108 * stored for the caller's effective uid; it returns 0 otherwise
110 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't
111 * be using it, because it allows them to get the user's secret key.
115 key_secretkey_is_set(void)
117 struct key_netstres kres;
119 memset((void*)&kres, 0, sizeof (kres));
120 if (key_call((u_long) KEY_NET_GET, (xdrproc_t)xdr_void, NULL,
121 (xdrproc_t)xdr_key_netstres, &kres) &&
122 (kres.status == KEY_SUCCESS) &&
123 (kres.key_netstres_u.knet.st_priv_key[0] != 0)) {
124 /* avoid leaving secret key in memory */
125 memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES);
132 key_encryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey)
137 arg.remotename = remotename;
138 arg.remotekey = *remotekey;
139 arg.deskey = *deskey;
140 if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
141 (xdrproc_t)xdr_cryptkeyres, &res)) {
144 if (res.status != KEY_SUCCESS) {
145 debug("encrypt status is nonzero");
148 *deskey = res.cryptkeyres_u.deskey;
153 key_decryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey)
158 arg.remotename = remotename;
159 arg.remotekey = *remotekey;
160 arg.deskey = *deskey;
161 if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
162 (xdrproc_t)xdr_cryptkeyres, &res)) {
165 if (res.status != KEY_SUCCESS) {
166 debug("decrypt status is nonzero");
169 *deskey = res.cryptkeyres_u.deskey;
174 key_encryptsession(const char *remotename, des_block *deskey)
179 arg.remotename = (char *) remotename;
180 arg.deskey = *deskey;
181 if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
182 (xdrproc_t)xdr_cryptkeyres, &res)) {
185 if (res.status != KEY_SUCCESS) {
186 debug("encrypt status is nonzero");
189 *deskey = res.cryptkeyres_u.deskey;
194 key_decryptsession(const char *remotename, des_block *deskey)
199 arg.remotename = (char *) remotename;
200 arg.deskey = *deskey;
201 if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
202 (xdrproc_t)xdr_cryptkeyres, &res)) {
205 if (res.status != KEY_SUCCESS) {
206 debug("decrypt status is nonzero");
209 *deskey = res.cryptkeyres_u.deskey;
214 key_gendes(des_block *key)
216 if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL,
217 (xdrproc_t)xdr_des_block, key)) {
224 key_setnet(struct key_netstarg *arg)
229 if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg,
230 (xdrproc_t)xdr_keystatus, &status)){
234 if (status != KEY_SUCCESS) {
235 debug("key_setnet status is nonzero");
243 key_get_conv(char *pkey, des_block *deskey)
247 if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey,
248 (xdrproc_t)xdr_cryptkeyres, &res)) {
251 if (res.status != KEY_SUCCESS) {
252 debug("get_conv status is nonzero");
255 *deskey = res.cryptkeyres_u.deskey;
259 struct key_call_private {
260 CLIENT *client; /* Client handle */
261 pid_t pid; /* process-id at moment of creation */
262 uid_t uid; /* user-id at last authorization */
264 static struct key_call_private *key_call_private_main = NULL;
267 key_call_destroy(void *vp)
269 struct key_call_private *kcp = (struct key_call_private *)vp;
273 clnt_destroy(kcp->client);
279 * Keep the handle cached. This call may be made quite often.
282 getkeyserv_handle(int vers)
285 struct netconfig *nconf;
286 struct netconfig *tpconf;
287 struct key_call_private *kcp = key_call_private_main;
288 struct timeval wait_time;
292 static thread_key_t key_call_key;
294 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */
295 #define TOTAL_TRIES 5 /* Number of tries */
297 if ((main_thread = thr_main())) {
298 kcp = key_call_private_main;
300 if (key_call_key == 0) {
301 mutex_lock(&tsd_lock);
302 if (key_call_key == 0)
303 thr_keycreate(&key_call_key, key_call_destroy);
304 mutex_unlock(&tsd_lock);
306 kcp = (struct key_call_private *)thr_getspecific(key_call_key);
309 kcp = (struct key_call_private *)malloc(sizeof (*kcp));
314 key_call_private_main = kcp;
316 thr_setspecific(key_call_key, (void *) kcp);
320 /* if pid has changed, destroy client and rebuild */
321 if (kcp->client != NULL && kcp->pid != getpid()) {
322 clnt_destroy(kcp->client);
326 if (kcp->client != NULL) {
327 /* if uid has changed, build client handle again */
328 if (kcp->uid != geteuid()) {
329 kcp->uid = geteuid();
330 auth_destroy(kcp->client->cl_auth);
331 kcp->client->cl_auth =
332 authsys_create("", kcp->uid, 0, 0, NULL);
333 if (kcp->client->cl_auth == NULL) {
334 clnt_destroy(kcp->client);
339 /* Change the version number to the new one */
340 clnt_control(kcp->client, CLSET_VERS, (void *)&vers);
341 return (kcp->client);
343 if (!(localhandle = setnetconfig())) {
349 endnetconfig(localhandle);
352 while ((nconf = getnetconfig(localhandle)) != NULL) {
353 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
355 * We use COTS_ORD here so that the caller can
356 * find out immediately if the server is dead.
358 if (nconf->nc_semantics == NC_TPI_COTS_ORD) {
359 kcp->client = clnt_tp_create(u.nodename,
360 KEY_PROG, vers, nconf);
368 if ((kcp->client == NULL) && (tpconf))
369 /* Now, try the CLTS or COTS loopback transport */
370 kcp->client = clnt_tp_create(u.nodename,
371 KEY_PROG, vers, tpconf);
372 endnetconfig(localhandle);
374 if (kcp->client == NULL) {
377 kcp->uid = geteuid();
379 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL);
380 if (kcp->client->cl_auth == NULL) {
381 clnt_destroy(kcp->client);
386 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES;
387 wait_time.tv_usec = 0;
388 clnt_control(kcp->client, CLSET_RETRY_TIMEOUT,
390 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd))
391 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */
393 return (kcp->client);
396 /* returns 0 on failure, 1 on success */
399 key_call(u_long proc, xdrproc_t xdr_arg, void *arg, xdrproc_t xdr_rslt,
403 struct timeval wait_time;
405 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) {
407 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg);
408 *(cryptkeyres*)rslt = *res;
410 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) {
412 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg);
413 *(cryptkeyres*)rslt = *res;
415 } else if (proc == KEY_GEN && __key_gendes_LOCAL) {
417 res = (*__key_gendes_LOCAL)(geteuid(), 0);
418 *(des_block*)rslt = *res;
422 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) ||
423 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) ||
424 (proc == KEY_GET_CONV))
425 clnt = getkeyserv_handle(2); /* talk to version 2 */
427 clnt = getkeyserv_handle(1); /* talk to version 1 */
433 wait_time.tv_sec = TOTAL_TIMEOUT;
434 wait_time.tv_usec = 0;
436 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt,
437 wait_time) == RPC_SUCCESS) {