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) 1988 by Sun Microsystems, Inc.
32 */
33 /*
34 * auth_des.c, client-side implementation of DES authentication
35 */
36
37 #include "namespace.h"
38 #include "reentrant.h"
39 #include <err.h>
40 #include <errno.h>
41 #include <string.h>
42 #include <stdlib.h>
43 #include <unistd.h>
44 #include <rpc/des_crypt.h>
45 #include <syslog.h>
46 #include <rpc/types.h>
47 #include <rpc/auth.h>
48 #include <rpc/auth_des.h>
49 #include <rpc/clnt.h>
50 #include <rpc/xdr.h>
51 #include <sys/socket.h>
52 #undef NIS
53 #include <rpcsvc/nis.h>
54 #include "un-namespace.h"
55 #include "mt_misc.h"
56
57 #if defined(LIBC_SCCS) && !defined(lint)
58 static char sccsid[] = "@(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI";
59 #endif
60 #define USEC_PER_SEC 1000000
61 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */
62
63 #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private
64 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type))
65 #define FREE(ptr, size) mem_free((char *)(ptr), (int) size)
66 #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE)
67
68 extern bool_t xdr_authdes_cred( XDR *, struct authdes_cred *);
69 extern bool_t xdr_authdes_verf( XDR *, struct authdes_verf *);
70 extern int key_encryptsession_pk(char *, netobj *, des_block *);
71
72 extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *,
73 char **, char **);
74
75 /*
76 * DES authenticator operations vector
77 */
78 static void authdes_nextverf(AUTH *);
79 static bool_t authdes_marshal(AUTH *, XDR *);
80 static bool_t authdes_validate(AUTH *, struct opaque_auth *);
81 static bool_t authdes_refresh(AUTH *, void *);
82 static void authdes_destroy(AUTH *);
83
84 static struct auth_ops *authdes_ops(void);
85
86 /*
87 * This struct is pointed to by the ah_private field of an "AUTH *"
88 */
89 struct ad_private {
90 char *ad_fullname; /* client's full name */
91 u_int ad_fullnamelen; /* length of name, rounded up */
92 char *ad_servername; /* server's full name */
93 u_int ad_servernamelen; /* length of name, rounded up */
94 u_int ad_window; /* client specified window */
95 bool_t ad_dosync; /* synchronize? */
96 struct netbuf ad_syncaddr; /* remote host to synch with */
97 char *ad_timehost; /* remote host to synch with */
98 struct timeval ad_timediff; /* server's time - client's time */
99 u_int ad_nickname; /* server's nickname for client */
100 struct authdes_cred ad_cred; /* storage for credential */
101 struct authdes_verf ad_verf; /* storage for verifier */
102 struct timeval ad_timestamp; /* timestamp sent */
103 des_block ad_xkey; /* encrypted conversation key */
104 u_char ad_pkey[1024]; /* Server's actual public key */
105 char *ad_netid; /* Timehost netid */
106 char *ad_uaddr; /* Timehost uaddr */
107 nis_server *ad_nis_srvr; /* NIS+ server struct */
108 };
109
110 AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *,
111 const des_block *, nis_server *);
112
113 /*
114 * documented version of authdes_seccreate
115 */
116 /*
117 servername: network name of server
118 win: time to live
119 timehost: optional hostname to sync with
120 ckey: optional conversation key to use
121 */
122
123 AUTH *
authdes_seccreate(const char * servername,const u_int win,const char * timehost,const des_block * ckey)124 authdes_seccreate(const char *servername, const u_int win,
125 const char *timehost, const des_block *ckey)
126 {
127 u_char pkey_data[1024];
128 netobj pkey;
129 AUTH *dummy;
130
131 if (! getpublickey(servername, (char *) pkey_data)) {
132 syslog(LOG_ERR,
133 "authdes_seccreate: no public key found for %s",
134 servername);
135 return (NULL);
136 }
137
138 pkey.n_bytes = (char *) pkey_data;
139 pkey.n_len = (u_int)strlen((char *)pkey_data) + 1;
140 dummy = authdes_pk_seccreate(servername, &pkey, win, timehost,
141 ckey, NULL);
142 return (dummy);
143 }
144
145 /*
146 * Slightly modified version of authdessec_create which takes the public key
147 * of the server principal as an argument. This spares us a call to
148 * getpublickey() which in the nameserver context can cause a deadlock.
149 */
150 AUTH *
authdes_pk_seccreate(const char * servername,netobj * pkey,u_int window,const char * timehost,const des_block * ckey,nis_server * srvr)151 authdes_pk_seccreate(const char *servername, netobj *pkey, u_int window,
152 const char *timehost, const des_block *ckey, nis_server *srvr)
153 {
154 AUTH *auth;
155 struct ad_private *ad;
156 char namebuf[MAXNETNAMELEN+1];
157
158 /*
159 * Allocate everything now
160 */
161 auth = ALLOC(AUTH);
162 if (auth == NULL) {
163 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
164 return (NULL);
165 }
166 ad = ALLOC(struct ad_private);
167 if (ad == NULL) {
168 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
169 goto failed;
170 }
171 ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */
172 ad->ad_timehost = NULL;
173 ad->ad_netid = NULL;
174 ad->ad_uaddr = NULL;
175 ad->ad_nis_srvr = NULL;
176 ad->ad_timediff.tv_sec = 0;
177 ad->ad_timediff.tv_usec = 0;
178 memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
179 if (!getnetname(namebuf))
180 goto failed;
181 ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf));
182 ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
183 ad->ad_servernamelen = strlen(servername);
184 ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
185
186 if (ad->ad_fullname == NULL || ad->ad_servername == NULL) {
187 syslog(LOG_ERR, "authdes_seccreate: out of memory");
188 goto failed;
189 }
190 if (timehost != NULL) {
191 ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
192 if (ad->ad_timehost == NULL) {
193 syslog(LOG_ERR, "authdes_seccreate: out of memory");
194 goto failed;
195 }
196 memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1);
197 ad->ad_dosync = TRUE;
198 } else if (srvr != NULL) {
199 ad->ad_nis_srvr = srvr; /* transient */
200 ad->ad_dosync = TRUE;
201 } else {
202 ad->ad_dosync = FALSE;
203 }
204 memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
205 memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1);
206 ad->ad_window = window;
207 if (ckey == NULL) {
208 if (key_gendes(&auth->ah_key) < 0) {
209 syslog(LOG_ERR,
210 "authdes_seccreate: keyserv(1m) is unable to generate session key");
211 goto failed;
212 }
213 } else {
214 auth->ah_key = *ckey;
215 }
216
217 /*
218 * Set up auth handle
219 */
220 auth->ah_cred.oa_flavor = AUTH_DES;
221 auth->ah_verf.oa_flavor = AUTH_DES;
222 auth->ah_ops = authdes_ops();
223 auth->ah_private = (caddr_t)ad;
224
225 if (!authdes_refresh(auth, NULL)) {
226 goto failed;
227 }
228 ad->ad_nis_srvr = NULL; /* not needed any longer */
229 return (auth);
230
231 failed:
232 if (auth)
233 FREE(auth, sizeof (AUTH));
234 if (ad) {
235 if (ad->ad_fullname)
236 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
237 if (ad->ad_servername)
238 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
239 if (ad->ad_timehost)
240 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
241 if (ad->ad_netid)
242 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
243 if (ad->ad_uaddr)
244 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
245 FREE(ad, sizeof (struct ad_private));
246 }
247 return (NULL);
248 }
249
250 /*
251 * Implement the five authentication operations
252 */
253
254
255 /*
256 * 1. Next Verifier
257 */
258 /*ARGSUSED*/
259 static void
authdes_nextverf(AUTH * auth __unused)260 authdes_nextverf(AUTH *auth __unused)
261 {
262 /* what the heck am I supposed to do??? */
263 }
264
265
266 /*
267 * 2. Marshal
268 */
269 static bool_t
authdes_marshal(AUTH * auth,XDR * xdrs)270 authdes_marshal(AUTH *auth, XDR *xdrs)
271 {
272 /* LINTED pointer alignment */
273 struct ad_private *ad = AUTH_PRIVATE(auth);
274 struct authdes_cred *cred = &ad->ad_cred;
275 struct authdes_verf *verf = &ad->ad_verf;
276 des_block cryptbuf[2];
277 des_block ivec;
278 int status;
279 int len;
280 rpc_inline_t *ixdr;
281
282 /*
283 * Figure out the "time", accounting for any time difference
284 * with the server if necessary.
285 */
286 (void)gettimeofday(&ad->ad_timestamp, NULL);
287 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
288 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
289 while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) {
290 ad->ad_timestamp.tv_usec -= USEC_PER_SEC;
291 ad->ad_timestamp.tv_sec++;
292 }
293
294 /*
295 * XDR the timestamp and possibly some other things, then
296 * encrypt them.
297 */
298 ixdr = (rpc_inline_t *)cryptbuf;
299 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec);
300 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec);
301 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
302 IXDR_PUT_U_INT32(ixdr, ad->ad_window);
303 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1);
304 ivec.key.high = ivec.key.low = 0;
305 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
306 (u_int) 2 * sizeof (des_block),
307 DES_ENCRYPT | DES_HW, (char *)&ivec);
308 } else {
309 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
310 (u_int) sizeof (des_block),
311 DES_ENCRYPT | DES_HW);
312 }
313 if (DES_FAILED(status)) {
314 syslog(LOG_ERR, "authdes_marshal: DES encryption failure");
315 return (FALSE);
316 }
317 ad->ad_verf.adv_xtimestamp = cryptbuf[0];
318 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
319 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
320 ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
321 } else {
322 ad->ad_cred.adc_nickname = ad->ad_nickname;
323 ad->ad_verf.adv_winverf = 0;
324 }
325
326 /*
327 * Serialize the credential and verifier into opaque
328 * authentication data.
329 */
330 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
331 len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen);
332 } else {
333 len = (1 + 1)*BYTES_PER_XDR_UNIT;
334 }
335
336 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
337 IXDR_PUT_INT32(ixdr, AUTH_DES);
338 IXDR_PUT_INT32(ixdr, len);
339 } else {
340 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor));
341 ATTEMPT(xdr_putint32(xdrs, &len));
342 }
343 ATTEMPT(xdr_authdes_cred(xdrs, cred));
344
345 len = (2 + 1)*BYTES_PER_XDR_UNIT;
346 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
347 IXDR_PUT_INT32(ixdr, AUTH_DES);
348 IXDR_PUT_INT32(ixdr, len);
349 } else {
350 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor));
351 ATTEMPT(xdr_putint32(xdrs, &len));
352 }
353 ATTEMPT(xdr_authdes_verf(xdrs, verf));
354 return (TRUE);
355 }
356
357
358 /*
359 * 3. Validate
360 */
361 static bool_t
authdes_validate(AUTH * auth,struct opaque_auth * rverf)362 authdes_validate(AUTH *auth, struct opaque_auth *rverf)
363 {
364 /* LINTED pointer alignment */
365 struct ad_private *ad = AUTH_PRIVATE(auth);
366 struct authdes_verf verf;
367 int status;
368 uint32_t *ixdr;
369 des_block buf;
370
371 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) {
372 return (FALSE);
373 }
374 /* LINTED pointer alignment */
375 ixdr = (uint32_t *)rverf->oa_base;
376 buf.key.high = (uint32_t)*ixdr++;
377 buf.key.low = (uint32_t)*ixdr++;
378 verf.adv_int_u = (uint32_t)*ixdr++;
379
380 /*
381 * Decrypt the timestamp
382 */
383 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf,
384 (u_int)sizeof (des_block), DES_DECRYPT | DES_HW);
385
386 if (DES_FAILED(status)) {
387 syslog(LOG_ERR, "authdes_validate: DES decryption failure");
388 return (FALSE);
389 }
390
391 /*
392 * xdr the decrypted timestamp
393 */
394 /* LINTED pointer alignment */
395 ixdr = (uint32_t *)buf.c;
396 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1;
397 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr);
398
399 /*
400 * validate
401 */
402 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
403 sizeof(struct timeval)) != 0) {
404 syslog(LOG_DEBUG, "authdes_validate: verifier mismatch");
405 return (FALSE);
406 }
407
408 /*
409 * We have a nickname now, let's use it
410 */
411 ad->ad_nickname = verf.adv_nickname;
412 ad->ad_cred.adc_namekind = ADN_NICKNAME;
413 return (TRUE);
414 }
415
416 /*
417 * 4. Refresh
418 */
419 /*ARGSUSED*/
420 static bool_t
authdes_refresh(AUTH * auth,void * dummy __unused)421 authdes_refresh(AUTH *auth, void *dummy __unused)
422 {
423 /* LINTED pointer alignment */
424 struct ad_private *ad = AUTH_PRIVATE(auth);
425 struct authdes_cred *cred = &ad->ad_cred;
426 int ok;
427 netobj pkey;
428
429 if (ad->ad_dosync) {
430 ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr,
431 ad->ad_timehost, &(ad->ad_uaddr),
432 &(ad->ad_netid));
433 if (! ok) {
434 /*
435 * Hope the clocks are synced!
436 */
437 ad->ad_dosync = 0;
438 syslog(LOG_DEBUG,
439 "authdes_refresh: unable to synchronize clock");
440 }
441 }
442 ad->ad_xkey = auth->ah_key;
443 pkey.n_bytes = (char *)(ad->ad_pkey);
444 pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1;
445 if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) {
446 syslog(LOG_INFO,
447 "authdes_refresh: keyserv(1m) is unable to encrypt session key");
448 return (FALSE);
449 }
450 cred->adc_fullname.key = ad->ad_xkey;
451 cred->adc_namekind = ADN_FULLNAME;
452 cred->adc_fullname.name = ad->ad_fullname;
453 return (TRUE);
454 }
455
456
457 /*
458 * 5. Destroy
459 */
460 static void
authdes_destroy(AUTH * auth)461 authdes_destroy(AUTH *auth)
462 {
463 /* LINTED pointer alignment */
464 struct ad_private *ad = AUTH_PRIVATE(auth);
465
466 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
467 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
468 if (ad->ad_timehost)
469 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
470 if (ad->ad_netid)
471 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
472 if (ad->ad_uaddr)
473 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
474 FREE(ad, sizeof (struct ad_private));
475 FREE(auth, sizeof(AUTH));
476 }
477
478 static struct auth_ops *
authdes_ops(void)479 authdes_ops(void)
480 {
481 static struct auth_ops ops;
482
483 /* VARIABLES PROTECTED BY ops_lock: ops */
484
485 mutex_lock(&authdes_ops_lock);
486 if (ops.ah_nextverf == NULL) {
487 ops.ah_nextverf = authdes_nextverf;
488 ops.ah_marshal = authdes_marshal;
489 ops.ah_validate = authdes_validate;
490 ops.ah_refresh = authdes_refresh;
491 ops.ah_destroy = authdes_destroy;
492 }
493 mutex_unlock(&authdes_ops_lock);
494 return (&ops);
495 }
496