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29 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
31 * @(#)key_call.c 1.25 94/04/24 SMI
32 * $FreeBSD: src/lib/libc/rpc/key_call.c,v 1.16 2006/02/27 22:10:59 deischen Exp $
36 * key_call.c, Interface to keyserver
38 * setsecretkey(key) - set your secret key
39 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent
40 * decryptsessionkey(agent, deskey) - decrypt ditto
41 * gendeskey(deskey) - generate a secure des key
44 #include "namespace.h"
45 #include "reentrant.h"
52 #include <rpc/auth_unix.h>
53 #include <rpc/key_prot.h>
55 #include <netconfig.h>
56 #include <sys/utsname.h>
59 #include <sys/fcntl.h>
60 #include "un-namespace.h"
64 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */
65 #define KEY_NRETRY 12 /* number of retries */
68 #define debug(msg) fprintf(stderr, "%s\n", msg);
74 * Hack to allow the keyserver to use AUTH_DES (for authenticated
75 * NIS+ calls, for example). The only functions that get called
76 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes.
78 * The approach is to have the keyserver fill in pointers to local
79 * implementations of these functions, and to call those in key_call().
82 cryptkeyres *(*__key_encryptsession_pk_LOCAL)(uid_t, cryptkeyarg2 *) = NULL;
83 cryptkeyres *(*__key_decryptsession_pk_LOCAL)(uid_t, cryptkeyarg2 *) = NULL;
84 des_block *(*__key_gendes_LOCAL)(uid_t, struct svc_req *) = NULL;
86 static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *);
88 int key_decryptsession_pk(char *, netobj *, des_block *);
89 int key_encryptsession_pk(char *, netobj *, des_block *);
90 int key_get_conv(char *, des_block *);
91 int key_setnet(struct key_netstarg *);
94 key_setsecret(const char *secretkey)
98 if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf,
100 (xdrproc_t)xdr_keystatus, &status)) {
103 if (status != KEY_SUCCESS) {
104 debug("set status is nonzero");
111 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key
112 * stored for the caller's effective uid; it returns 0 otherwise
114 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't
115 * be using it, because it allows them to get the user's secret key.
119 key_secretkey_is_set(void)
121 struct key_netstres kres;
123 memset((void*)&kres, 0, sizeof (kres));
124 if (key_call((u_long) KEY_NET_GET, (xdrproc_t)xdr_void, NULL,
125 (xdrproc_t)xdr_key_netstres, &kres) &&
126 (kres.status == KEY_SUCCESS) &&
127 (kres.key_netstres_u.knet.st_priv_key[0] != 0)) {
128 /* avoid leaving secret key in memory */
129 memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES);
136 key_encryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey)
141 arg.remotename = remotename;
142 arg.remotekey = *remotekey;
143 arg.deskey = *deskey;
144 if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
145 (xdrproc_t)xdr_cryptkeyres, &res)) {
148 if (res.status != KEY_SUCCESS) {
149 debug("encrypt status is nonzero");
152 *deskey = res.cryptkeyres_u.deskey;
157 key_decryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey)
162 arg.remotename = remotename;
163 arg.remotekey = *remotekey;
164 arg.deskey = *deskey;
165 if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
166 (xdrproc_t)xdr_cryptkeyres, &res)) {
169 if (res.status != KEY_SUCCESS) {
170 debug("decrypt status is nonzero");
173 *deskey = res.cryptkeyres_u.deskey;
178 key_encryptsession(const char *remotename, des_block *deskey)
183 arg.remotename = (char *) remotename;
184 arg.deskey = *deskey;
185 if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
186 (xdrproc_t)xdr_cryptkeyres, &res)) {
189 if (res.status != KEY_SUCCESS) {
190 debug("encrypt status is nonzero");
193 *deskey = res.cryptkeyres_u.deskey;
198 key_decryptsession(const char *remotename, des_block *deskey)
203 arg.remotename = (char *) remotename;
204 arg.deskey = *deskey;
205 if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
206 (xdrproc_t)xdr_cryptkeyres, &res)) {
209 if (res.status != KEY_SUCCESS) {
210 debug("decrypt status is nonzero");
213 *deskey = res.cryptkeyres_u.deskey;
218 key_gendes(des_block *key)
220 if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL,
221 (xdrproc_t)xdr_des_block, key)) {
228 key_setnet(struct key_netstarg *arg)
233 if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg,
234 (xdrproc_t)xdr_keystatus, &status)){
238 if (status != KEY_SUCCESS) {
239 debug("key_setnet status is nonzero");
247 key_get_conv(char *pkey, des_block *deskey)
251 if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey,
252 (xdrproc_t)xdr_cryptkeyres, &res)) {
255 if (res.status != KEY_SUCCESS) {
256 debug("get_conv status is nonzero");
259 *deskey = res.cryptkeyres_u.deskey;
263 struct key_call_private {
264 CLIENT *client; /* Client handle */
265 pid_t pid; /* process-id at moment of creation */
266 uid_t uid; /* user-id at last authorization */
268 static struct key_call_private *key_call_private_main = NULL;
271 key_call_destroy(void *vp)
273 struct key_call_private *kcp = (struct key_call_private *)vp;
277 clnt_destroy(kcp->client);
283 * Keep the handle cached. This call may be made quite often.
286 getkeyserv_handle(int vers)
289 struct netconfig *nconf;
290 struct netconfig *tpconf;
291 struct key_call_private *kcp = key_call_private_main;
292 struct timeval wait_time;
296 static thread_key_t key_call_key;
298 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */
299 #define TOTAL_TRIES 5 /* Number of tries */
301 if ((main_thread = thr_main())) {
302 kcp = key_call_private_main;
304 if (key_call_key == 0) {
305 mutex_lock(&tsd_lock);
306 if (key_call_key == 0)
307 thr_keycreate(&key_call_key, key_call_destroy);
308 mutex_unlock(&tsd_lock);
310 kcp = (struct key_call_private *)thr_getspecific(key_call_key);
313 kcp = (struct key_call_private *)malloc(sizeof (*kcp));
318 key_call_private_main = kcp;
320 thr_setspecific(key_call_key, (void *) kcp);
324 /* if pid has changed, destroy client and rebuild */
325 if (kcp->client != NULL && kcp->pid != getpid()) {
326 clnt_destroy(kcp->client);
330 if (kcp->client != NULL) {
331 /* if uid has changed, build client handle again */
332 if (kcp->uid != geteuid()) {
333 kcp->uid = geteuid();
334 auth_destroy(kcp->client->cl_auth);
335 kcp->client->cl_auth =
336 authsys_create("", kcp->uid, 0, 0, NULL);
337 if (kcp->client->cl_auth == NULL) {
338 clnt_destroy(kcp->client);
343 /* Change the version number to the new one */
344 clnt_control(kcp->client, CLSET_VERS, (void *)&vers);
345 return (kcp->client);
347 if (!(localhandle = setnetconfig())) {
353 endnetconfig(localhandle);
356 while ((nconf = getnetconfig(localhandle)) != NULL) {
357 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
359 * We use COTS_ORD here so that the caller can
360 * find out immediately if the server is dead.
362 if (nconf->nc_semantics == NC_TPI_COTS_ORD) {
363 kcp->client = clnt_tp_create(u.nodename,
364 KEY_PROG, vers, nconf);
372 if ((kcp->client == NULL) && (tpconf))
373 /* Now, try the CLTS or COTS loopback transport */
374 kcp->client = clnt_tp_create(u.nodename,
375 KEY_PROG, vers, tpconf);
376 endnetconfig(localhandle);
378 if (kcp->client == NULL) {
381 kcp->uid = geteuid();
383 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL);
384 if (kcp->client->cl_auth == NULL) {
385 clnt_destroy(kcp->client);
390 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES;
391 wait_time.tv_usec = 0;
392 clnt_control(kcp->client, CLSET_RETRY_TIMEOUT,
394 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd))
395 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */
397 return (kcp->client);
400 /* returns 0 on failure, 1 on success */
403 key_call(u_long proc, xdrproc_t xdr_arg, void *arg, xdrproc_t xdr_rslt,
407 struct timeval wait_time;
409 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) {
411 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg);
412 *(cryptkeyres*)rslt = *res;
414 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) {
416 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg);
417 *(cryptkeyres*)rslt = *res;
419 } else if (proc == KEY_GEN && __key_gendes_LOCAL) {
421 res = (*__key_gendes_LOCAL)(geteuid(), 0);
422 *(des_block*)rslt = *res;
426 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) ||
427 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) ||
428 (proc == KEY_GET_CONV))
429 clnt = getkeyserv_handle(2); /* talk to version 2 */
431 clnt = getkeyserv_handle(1); /* talk to version 1 */
437 wait_time.tv_sec = TOTAL_TIMEOUT;
438 wait_time.tv_usec = 0;
440 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt,
441 wait_time) == RPC_SUCCESS) {