1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30 /*
31 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
32 */
33
34 #ident "@(#)key_call.c 1.25 94/04/24 SMI"
35 /*
36 * key_call.c, Interface to keyserver
37 *
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
42 */
43
44 #include "namespace.h"
45 #include "reentrant.h"
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <unistd.h>
49 #include <errno.h>
50 #include <rpc/rpc.h>
51 #include <rpc/auth.h>
52 #include <rpc/auth_unix.h>
53 #include <rpc/key_prot.h>
54 #include <string.h>
55 #include <netconfig.h>
56 #include <sys/utsname.h>
57 #include <stdlib.h>
58 #include <signal.h>
59 #include <sys/wait.h>
60 #include <sys/fcntl.h>
61 #include "un-namespace.h"
62 #include "mt_misc.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) (void) 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)(uid_t, void *arg) = 0;
84 cryptkeyres *(*__key_decryptsession_pk_LOCAL)(uid_t, void *arg) = 0;
85 des_block *(*__key_gendes_LOCAL)(uid_t, void *) = 0;
86
87 static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *);
88
89 int
key_setsecret(const char * secretkey)90 key_setsecret(const char *secretkey)
91 {
92 keystatus status;
93
94 if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf,
95 (void *)secretkey,
96 (xdrproc_t)xdr_keystatus, &status)) {
97 return (-1);
98 }
99 if (status != KEY_SUCCESS) {
100 debug("set status is nonzero");
101 return (-1);
102 }
103 return (0);
104 }
105
106
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
109 *
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.
112 */
113
114 int
key_secretkey_is_set(void)115 key_secretkey_is_set(void)
116 {
117 struct key_netstres kres;
118
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);
126 return (1);
127 }
128 return (0);
129 }
130
131 int
key_encryptsession_pk(char * remotename,netobj * remotekey,des_block * deskey)132 key_encryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey)
133 {
134 cryptkeyarg2 arg;
135 cryptkeyres res;
136
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)) {
142 return (-1);
143 }
144 if (res.status != KEY_SUCCESS) {
145 debug("encrypt status is nonzero");
146 return (-1);
147 }
148 *deskey = res.cryptkeyres_u.deskey;
149 return (0);
150 }
151
152 int
key_decryptsession_pk(char * remotename,netobj * remotekey,des_block * deskey)153 key_decryptsession_pk(char *remotename, netobj *remotekey, des_block *deskey)
154 {
155 cryptkeyarg2 arg;
156 cryptkeyres res;
157
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)) {
163 return (-1);
164 }
165 if (res.status != KEY_SUCCESS) {
166 debug("decrypt status is nonzero");
167 return (-1);
168 }
169 *deskey = res.cryptkeyres_u.deskey;
170 return (0);
171 }
172
173 int
key_encryptsession(const char * remotename,des_block * deskey)174 key_encryptsession(const char *remotename, des_block *deskey)
175 {
176 cryptkeyarg arg;
177 cryptkeyres res;
178
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)) {
183 return (-1);
184 }
185 if (res.status != KEY_SUCCESS) {
186 debug("encrypt status is nonzero");
187 return (-1);
188 }
189 *deskey = res.cryptkeyres_u.deskey;
190 return (0);
191 }
192
193 int
key_decryptsession(const char * remotename,des_block * deskey)194 key_decryptsession(const char *remotename, des_block *deskey)
195 {
196 cryptkeyarg arg;
197 cryptkeyres res;
198
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)) {
203 return (-1);
204 }
205 if (res.status != KEY_SUCCESS) {
206 debug("decrypt status is nonzero");
207 return (-1);
208 }
209 *deskey = res.cryptkeyres_u.deskey;
210 return (0);
211 }
212
213 int
key_gendes(des_block * key)214 key_gendes(des_block *key)
215 {
216 if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL,
217 (xdrproc_t)xdr_des_block, key)) {
218 return (-1);
219 }
220 return (0);
221 }
222
223 int
key_setnet(struct key_netstarg * arg)224 key_setnet(struct key_netstarg *arg)
225 {
226 keystatus status;
227
228
229 if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg,
230 (xdrproc_t)xdr_keystatus, &status)){
231 return (-1);
232 }
233
234 if (status != KEY_SUCCESS) {
235 debug("key_setnet status is nonzero");
236 return (-1);
237 }
238 return (1);
239 }
240
241
242 int
key_get_conv(char * pkey,des_block * deskey)243 key_get_conv(char *pkey, des_block *deskey)
244 {
245 cryptkeyres res;
246
247 if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey,
248 (xdrproc_t)xdr_cryptkeyres, &res)) {
249 return (-1);
250 }
251 if (res.status != KEY_SUCCESS) {
252 debug("get_conv status is nonzero");
253 return (-1);
254 }
255 *deskey = res.cryptkeyres_u.deskey;
256 return (0);
257 }
258
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 */
263 };
264 static struct key_call_private *key_call_private_main = NULL;
265 static thread_key_t key_call_key;
266 static once_t key_call_once = ONCE_INITIALIZER;
267 static int key_call_key_error;
268
269 static void
key_call_destroy(void * vp)270 key_call_destroy(void *vp)
271 {
272 struct key_call_private *kcp = (struct key_call_private *)vp;
273
274 if (kcp) {
275 if (kcp->client)
276 clnt_destroy(kcp->client);
277 free(kcp);
278 }
279 }
280
281 static void
key_call_init(void)282 key_call_init(void)
283 {
284
285 key_call_key_error = thr_keycreate(&key_call_key, key_call_destroy);
286 }
287
288 /*
289 * Keep the handle cached. This call may be made quite often.
290 */
291 static CLIENT *
getkeyserv_handle(int vers)292 getkeyserv_handle(int vers)
293 {
294 void *localhandle;
295 struct netconfig *nconf;
296 struct netconfig *tpconf;
297 struct key_call_private *kcp;
298 struct timeval wait_time;
299 struct utsname u;
300 int main_thread;
301 int fd;
302
303 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */
304 #define TOTAL_TRIES 5 /* Number of tries */
305
306 if ((main_thread = thr_main())) {
307 kcp = key_call_private_main;
308 } else {
309 if (thr_once(&key_call_once, key_call_init) != 0 ||
310 key_call_key_error != 0)
311 return ((CLIENT *) NULL);
312 kcp = (struct key_call_private *)thr_getspecific(key_call_key);
313 }
314 if (kcp == (struct key_call_private *)NULL) {
315 kcp = (struct key_call_private *)malloc(sizeof (*kcp));
316 if (kcp == (struct key_call_private *)NULL) {
317 return ((CLIENT *) NULL);
318 }
319 if (main_thread)
320 key_call_private_main = kcp;
321 else
322 thr_setspecific(key_call_key, (void *) kcp);
323 kcp->client = NULL;
324 }
325
326 /* if pid has changed, destroy client and rebuild */
327 if (kcp->client != NULL && kcp->pid != getpid()) {
328 clnt_destroy(kcp->client);
329 kcp->client = NULL;
330 }
331
332 if (kcp->client != NULL) {
333 /* if uid has changed, build client handle again */
334 if (kcp->uid != geteuid()) {
335 kcp->uid = geteuid();
336 auth_destroy(kcp->client->cl_auth);
337 kcp->client->cl_auth =
338 authsys_create("", kcp->uid, 0, 0, NULL);
339 if (kcp->client->cl_auth == NULL) {
340 clnt_destroy(kcp->client);
341 kcp->client = NULL;
342 return ((CLIENT *) NULL);
343 }
344 }
345 /* Change the version number to the new one */
346 clnt_control(kcp->client, CLSET_VERS, (void *)&vers);
347 return (kcp->client);
348 }
349 if (!(localhandle = setnetconfig())) {
350 return ((CLIENT *) NULL);
351 }
352 tpconf = NULL;
353 #if defined(__FreeBSD__)
354 if (uname(&u) == -1)
355 #else
356 #if defined(i386)
357 if (_nuname(&u) == -1)
358 #elif defined(sparc)
359 if (_uname(&u) == -1)
360 #else
361 #error Unknown architecture!
362 #endif
363 #endif
364 {
365 endnetconfig(localhandle);
366 return ((CLIENT *) NULL);
367 }
368 while ((nconf = getnetconfig(localhandle)) != NULL) {
369 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
370 /*
371 * We use COTS_ORD here so that the caller can
372 * find out immediately if the server is dead.
373 */
374 if (nconf->nc_semantics == NC_TPI_COTS_ORD) {
375 kcp->client = clnt_tp_create(u.nodename,
376 KEY_PROG, vers, nconf);
377 if (kcp->client)
378 break;
379 } else {
380 tpconf = nconf;
381 }
382 }
383 }
384 if ((kcp->client == (CLIENT *) NULL) && (tpconf))
385 /* Now, try the CLTS or COTS loopback transport */
386 kcp->client = clnt_tp_create(u.nodename,
387 KEY_PROG, vers, tpconf);
388 endnetconfig(localhandle);
389
390 if (kcp->client == (CLIENT *) NULL) {
391 return ((CLIENT *) NULL);
392 }
393 kcp->uid = geteuid();
394 kcp->pid = getpid();
395 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL);
396 if (kcp->client->cl_auth == NULL) {
397 clnt_destroy(kcp->client);
398 kcp->client = NULL;
399 return ((CLIENT *) NULL);
400 }
401
402 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES;
403 wait_time.tv_usec = 0;
404 (void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT,
405 (char *)&wait_time);
406 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd))
407 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */
408
409 return (kcp->client);
410 }
411
412 /* returns 0 on failure, 1 on success */
413
414 static int
key_call(u_long proc,xdrproc_t xdr_arg,void * arg,xdrproc_t xdr_rslt,void * rslt)415 key_call(u_long proc, xdrproc_t xdr_arg, void *arg, xdrproc_t xdr_rslt,
416 void *rslt)
417 {
418 CLIENT *clnt;
419 struct timeval wait_time;
420
421 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) {
422 cryptkeyres *res;
423 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg);
424 *(cryptkeyres*)rslt = *res;
425 return (1);
426 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) {
427 cryptkeyres *res;
428 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg);
429 *(cryptkeyres*)rslt = *res;
430 return (1);
431 } else if (proc == KEY_GEN && __key_gendes_LOCAL) {
432 des_block *res;
433 res = (*__key_gendes_LOCAL)(geteuid(), 0);
434 *(des_block*)rslt = *res;
435 return (1);
436 }
437
438 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) ||
439 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) ||
440 (proc == KEY_GET_CONV))
441 clnt = getkeyserv_handle(2); /* talk to version 2 */
442 else
443 clnt = getkeyserv_handle(1); /* talk to version 1 */
444
445 if (clnt == NULL) {
446 return (0);
447 }
448
449 wait_time.tv_sec = TOTAL_TIMEOUT;
450 wait_time.tv_usec = 0;
451
452 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt,
453 wait_time) == RPC_SUCCESS) {
454 return (1);
455 } else {
456 return (0);
457 }
458 }
459