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