1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California  94043
28 */
29/*
30 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
31 */
32
33#ident	"@(#)key_call.c	1.25	94/04/24 SMI"
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37/*
38 * key_call.c, Interface to keyserver
39 *
40 * setsecretkey(key) - set your secret key
41 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent
42 * decryptsessionkey(agent, deskey) - decrypt ditto
43 * gendeskey(deskey) - generate a secure des key
44 */
45
46#include "namespace.h"
47#include "reentrant.h"
48#include <stdio.h>
49#include <stdlib.h>
50#include <unistd.h>
51#include <errno.h>
52#include <rpc/rpc.h>
53#include <rpc/auth.h>
54#include <rpc/auth_unix.h>
55#include <rpc/key_prot.h>
56#include <string.h>
57#include <netconfig.h>
58#include <sys/utsname.h>
59#include <stdlib.h>
60#include <signal.h>
61#include <sys/wait.h>
62#include <sys/fcntl.h>
63#include "un-namespace.h"
64#include "mt_misc.h"
65
66
67#define	KEY_TIMEOUT	5	/* per-try timeout in seconds */
68#define	KEY_NRETRY	12	/* number of retries */
69
70#ifdef DEBUG
71#define	debug(msg)	(void) fprintf(stderr, "%s\n", msg);
72#else
73#define	debug(msg)
74#endif /* DEBUG */
75
76/*
77 * Hack to allow the keyserver to use AUTH_DES (for authenticated
78 * NIS+ calls, for example).  The only functions that get called
79 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes.
80 *
81 * The approach is to have the keyserver fill in pointers to local
82 * implementations of these functions, and to call those in key_call().
83 */
84
85cryptkeyres *(*__key_encryptsession_pk_LOCAL)() = 0;
86cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = 0;
87des_block *(*__key_gendes_LOCAL)() = 0;
88
89static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *);
90
91int
92key_setsecret(secretkey)
93	const char *secretkey;
94{
95	keystatus status;
96
97	if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf,
98			(void *)secretkey,
99			(xdrproc_t)xdr_keystatus, &status)) {
100		return (-1);
101	}
102	if (status != KEY_SUCCESS) {
103		debug("set status is nonzero");
104		return (-1);
105	}
106	return (0);
107}
108
109
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
112 *
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.
115 */
116
117int
118key_secretkey_is_set(void)
119{
120	struct key_netstres 	kres;
121
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);
129		return (1);
130	}
131	return (0);
132}
133
134int
135key_encryptsession_pk(remotename, remotekey, deskey)
136	char *remotename;
137	netobj *remotekey;
138	des_block *deskey;
139{
140	cryptkeyarg2 arg;
141	cryptkeyres res;
142
143	arg.remotename = remotename;
144	arg.remotekey = *remotekey;
145	arg.deskey = *deskey;
146	if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
147			(xdrproc_t)xdr_cryptkeyres, &res)) {
148		return (-1);
149	}
150	if (res.status != KEY_SUCCESS) {
151		debug("encrypt status is nonzero");
152		return (-1);
153	}
154	*deskey = res.cryptkeyres_u.deskey;
155	return (0);
156}
157
158int
159key_decryptsession_pk(remotename, remotekey, deskey)
160	char *remotename;
161	netobj *remotekey;
162	des_block *deskey;
163{
164	cryptkeyarg2 arg;
165	cryptkeyres res;
166
167	arg.remotename = remotename;
168	arg.remotekey = *remotekey;
169	arg.deskey = *deskey;
170	if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
171			(xdrproc_t)xdr_cryptkeyres, &res)) {
172		return (-1);
173	}
174	if (res.status != KEY_SUCCESS) {
175		debug("decrypt status is nonzero");
176		return (-1);
177	}
178	*deskey = res.cryptkeyres_u.deskey;
179	return (0);
180}
181
182int
183key_encryptsession(remotename, deskey)
184	const char *remotename;
185	des_block *deskey;
186{
187	cryptkeyarg arg;
188	cryptkeyres res;
189
190	arg.remotename = (char *) remotename;
191	arg.deskey = *deskey;
192	if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
193			(xdrproc_t)xdr_cryptkeyres, &res)) {
194		return (-1);
195	}
196	if (res.status != KEY_SUCCESS) {
197		debug("encrypt status is nonzero");
198		return (-1);
199	}
200	*deskey = res.cryptkeyres_u.deskey;
201	return (0);
202}
203
204int
205key_decryptsession(remotename, deskey)
206	const char *remotename;
207	des_block *deskey;
208{
209	cryptkeyarg arg;
210	cryptkeyres res;
211
212	arg.remotename = (char *) remotename;
213	arg.deskey = *deskey;
214	if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
215			(xdrproc_t)xdr_cryptkeyres, &res)) {
216		return (-1);
217	}
218	if (res.status != KEY_SUCCESS) {
219		debug("decrypt status is nonzero");
220		return (-1);
221	}
222	*deskey = res.cryptkeyres_u.deskey;
223	return (0);
224}
225
226int
227key_gendes(key)
228	des_block *key;
229{
230	if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL,
231			(xdrproc_t)xdr_des_block, key)) {
232		return (-1);
233	}
234	return (0);
235}
236
237int
238key_setnet(arg)
239struct key_netstarg *arg;
240{
241	keystatus status;
242
243
244	if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg,
245			(xdrproc_t)xdr_keystatus, &status)){
246		return (-1);
247	}
248
249	if (status != KEY_SUCCESS) {
250		debug("key_setnet status is nonzero");
251		return (-1);
252	}
253	return (1);
254}
255
256
257int
258key_get_conv(pkey, deskey)
259	char *pkey;
260	des_block *deskey;
261{
262	cryptkeyres res;
263
264	if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey,
265			(xdrproc_t)xdr_cryptkeyres, &res)) {
266		return (-1);
267	}
268	if (res.status != KEY_SUCCESS) {
269		debug("get_conv status is nonzero");
270		return (-1);
271	}
272	*deskey = res.cryptkeyres_u.deskey;
273	return (0);
274}
275
276struct  key_call_private {
277	CLIENT	*client;	/* Client handle */
278	pid_t	pid;		/* process-id at moment of creation */
279	uid_t	uid;		/* user-id at last authorization */
280};
281static struct key_call_private *key_call_private_main = NULL;
282static thread_key_t key_call_key;
283static once_t key_call_once = ONCE_INITIALIZER;
284static int key_call_key_error;
285
286static void
287key_call_destroy(void *vp)
288{
289	struct key_call_private *kcp = (struct key_call_private *)vp;
290
291	if (kcp) {
292		if (kcp->client)
293			clnt_destroy(kcp->client);
294		free(kcp);
295	}
296}
297
298static void
299key_call_init(void)
300{
301
302	key_call_key_error = thr_keycreate(&key_call_key, key_call_destroy);
303}
304
305/*
306 * Keep the handle cached.  This call may be made quite often.
307 */
308static CLIENT *
309getkeyserv_handle(vers)
310int	vers;
311{
312	void *localhandle;
313	struct netconfig *nconf;
314	struct netconfig *tpconf;
315	struct key_call_private *kcp;
316	struct timeval wait_time;
317	struct utsname u;
318	int main_thread;
319	int fd;
320
321#define	TOTAL_TIMEOUT	30	/* total timeout talking to keyserver */
322#define	TOTAL_TRIES	5	/* Number of tries */
323
324	if ((main_thread = thr_main())) {
325		kcp = key_call_private_main;
326	} else {
327		if (thr_once(&key_call_once, key_call_init) != 0 ||
328		    key_call_key_error != 0)
329			return ((CLIENT *) NULL);
330		kcp = (struct key_call_private *)thr_getspecific(key_call_key);
331	}
332	if (kcp == (struct key_call_private *)NULL) {
333		kcp = (struct key_call_private *)malloc(sizeof (*kcp));
334		if (kcp == (struct key_call_private *)NULL) {
335			return ((CLIENT *) NULL);
336		}
337                if (main_thread)
338                        key_call_private_main = kcp;
339                else
340                        thr_setspecific(key_call_key, (void *) kcp);
341		kcp->client = NULL;
342	}
343
344	/* if pid has changed, destroy client and rebuild */
345	if (kcp->client != NULL && kcp->pid != getpid()) {
346		clnt_destroy(kcp->client);
347		kcp->client = NULL;
348	}
349
350	if (kcp->client != NULL) {
351		/* if uid has changed, build client handle again */
352		if (kcp->uid != geteuid()) {
353			kcp->uid = geteuid();
354			auth_destroy(kcp->client->cl_auth);
355			kcp->client->cl_auth =
356				authsys_create("", kcp->uid, 0, 0, NULL);
357			if (kcp->client->cl_auth == NULL) {
358				clnt_destroy(kcp->client);
359				kcp->client = NULL;
360				return ((CLIENT *) NULL);
361			}
362		}
363		/* Change the version number to the new one */
364		clnt_control(kcp->client, CLSET_VERS, (void *)&vers);
365		return (kcp->client);
366	}
367	if (!(localhandle = setnetconfig())) {
368		return ((CLIENT *) NULL);
369	}
370        tpconf = NULL;
371#if defined(__FreeBSD__)
372	if (uname(&u) == -1)
373#else
374#if defined(i386)
375	if (_nuname(&u) == -1)
376#elif defined(sparc)
377	if (_uname(&u) == -1)
378#else
379#error Unknown architecture!
380#endif
381#endif
382	{
383		endnetconfig(localhandle);
384		return ((CLIENT *) NULL);
385        }
386	while ((nconf = getnetconfig(localhandle)) != NULL) {
387		if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
388			/*
389			 * We use COTS_ORD here so that the caller can
390			 * find out immediately if the server is dead.
391			 */
392			if (nconf->nc_semantics == NC_TPI_COTS_ORD) {
393				kcp->client = clnt_tp_create(u.nodename,
394					KEY_PROG, vers, nconf);
395				if (kcp->client)
396					break;
397			} else {
398				tpconf = nconf;
399			}
400		}
401	}
402	if ((kcp->client == (CLIENT *) NULL) && (tpconf))
403		/* Now, try the CLTS or COTS loopback transport */
404		kcp->client = clnt_tp_create(u.nodename,
405			KEY_PROG, vers, tpconf);
406	endnetconfig(localhandle);
407
408	if (kcp->client == (CLIENT *) NULL) {
409		return ((CLIENT *) NULL);
410        }
411	kcp->uid = geteuid();
412	kcp->pid = getpid();
413	kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL);
414	if (kcp->client->cl_auth == NULL) {
415		clnt_destroy(kcp->client);
416		kcp->client = NULL;
417		return ((CLIENT *) NULL);
418	}
419
420	wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES;
421	wait_time.tv_usec = 0;
422	(void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT,
423		(char *)&wait_time);
424	if (clnt_control(kcp->client, CLGET_FD, (char *)&fd))
425		_fcntl(fd, F_SETFD, 1);	/* make it "close on exec" */
426
427	return (kcp->client);
428}
429
430/* returns  0 on failure, 1 on success */
431
432static int
433key_call(proc, xdr_arg, arg, xdr_rslt, rslt)
434	u_long proc;
435	xdrproc_t xdr_arg;
436	void *arg;
437	xdrproc_t xdr_rslt;
438	void *rslt;
439{
440	CLIENT *clnt;
441	struct timeval wait_time;
442
443	if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) {
444		cryptkeyres *res;
445		res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg);
446		*(cryptkeyres*)rslt = *res;
447		return (1);
448	} else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) {
449		cryptkeyres *res;
450		res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg);
451		*(cryptkeyres*)rslt = *res;
452		return (1);
453	} else if (proc == KEY_GEN && __key_gendes_LOCAL) {
454		des_block *res;
455		res = (*__key_gendes_LOCAL)(geteuid(), 0);
456		*(des_block*)rslt = *res;
457		return (1);
458	}
459
460	if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) ||
461	    (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) ||
462	    (proc == KEY_GET_CONV))
463		clnt = getkeyserv_handle(2); /* talk to version 2 */
464	else
465		clnt = getkeyserv_handle(1); /* talk to version 1 */
466
467	if (clnt == NULL) {
468		return (0);
469	}
470
471	wait_time.tv_sec = TOTAL_TIMEOUT;
472	wait_time.tv_usec = 0;
473
474	if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt,
475		wait_time) == RPC_SUCCESS) {
476		return (1);
477	} else {
478		return (0);
479	}
480}
481