1 /*-
2 * Copyright (c) 2009, Sun Microsystems, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * - Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 * this list of conditions and the following disclaimer in the documentation
11 * and/or other materials provided with the distribution.
12 * - Neither the name of Sun Microsystems, Inc. nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 * @(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI
29 * $FreeBSD: src/lib/libc/rpc/auth_des.c,v 1.10 2006/02/27 22:10:58 deischen Exp $
30 */
31 /*
32 * Copyright (c) 1988 by Sun Microsystems, Inc.
33 */
34 /*
35 * auth_des.c, client-side implementation of DES authentication
36 */
37
38 #include "namespace.h"
39 #include "reentrant.h"
40 #include <err.h>
41 #include <errno.h>
42 #include <string.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45 #include <rpc/des_crypt.h>
46 #include <syslog.h>
47 #include <rpc/types.h>
48 #include <rpc/auth.h>
49 #include <rpc/auth_des.h>
50 #include <rpc/clnt.h>
51 #include <rpc/xdr.h>
52 #include <sys/socket.h>
53 #undef NIS
54 #include <rpcsvc/nis.h>
55 #include "un-namespace.h"
56 #include "mt_misc.h"
57
58 #define USEC_PER_SEC 1000000
59 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */
60
61 #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private
62 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type))
63 #define FREE(ptr, size) mem_free((char *)(ptr), (int) size)
64 #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE)
65
66 extern bool_t xdr_authdes_cred(XDR *, struct authdes_cred *);
67 extern bool_t xdr_authdes_verf(XDR *, struct authdes_verf *);
68 extern int key_encryptsession_pk(char *, netobj *, des_block *);
69
70 extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *,
71 char **, char **);
72
73
74 /*
75 * DES authenticator operations vector
76 */
77 static void authdes_nextverf(AUTH *);
78 static bool_t authdes_marshal(AUTH *, XDR *);
79 static bool_t authdes_validate(AUTH *, struct opaque_auth *);
80 static bool_t authdes_refresh(AUTH *, void *);
81 static void authdes_destroy(AUTH *);
82
83 static struct auth_ops *authdes_ops(void);
84
85 /*
86 * This struct is pointed to by the ah_private field of an "AUTH *"
87 */
88 struct ad_private {
89 char *ad_fullname; /* client's full name */
90 u_int ad_fullnamelen; /* length of name, rounded up */
91 char *ad_servername; /* server's full name */
92 u_int ad_servernamelen; /* length of name, rounded up */
93 u_int ad_window; /* client specified window */
94 bool_t ad_dosync; /* synchronize? */
95 struct netbuf ad_syncaddr; /* remote host to synch with */
96 char *ad_timehost; /* remote host to synch with */
97 struct timeval ad_timediff; /* server's time - client's time */
98 u_int ad_nickname; /* server's nickname for client */
99 struct authdes_cred ad_cred; /* storage for credential */
100 struct authdes_verf ad_verf; /* storage for verifier */
101 struct timeval ad_timestamp; /* timestamp sent */
102 des_block ad_xkey; /* encrypted conversation key */
103 u_char ad_pkey[1024]; /* Server's actual public key */
104 char *ad_netid; /* Timehost netid */
105 char *ad_uaddr; /* Timehost uaddr */
106 nis_server *ad_nis_srvr; /* NIS+ server struct */
107 };
108
109 AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *,
110 const des_block *, nis_server *);
111 /*
112 * documented version of authdes_seccreate
113 */
114 /*
115 servername: network name of server
116 win: time to live
117 timehost: optional hostname to sync with
118 ckey: optional conversation key to use
119 */
120
121 AUTH *
authdes_seccreate(const char * servername,const u_int win,const char * timehost,const des_block * ckey)122 authdes_seccreate(const char *servername, const u_int win,
123 const char *timehost, const des_block *ckey)
124 {
125 u_char pkey_data[1024];
126 netobj pkey;
127 AUTH *dummy;
128
129 if (! getpublickey(servername, (char *) pkey_data)) {
130 syslog(LOG_ERR,
131 "authdes_seccreate: no public key found for %s",
132 servername);
133 return (NULL);
134 }
135
136 pkey.n_bytes = (char *) pkey_data;
137 pkey.n_len = (u_int)strlen((char *)pkey_data) + 1;
138 dummy = authdes_pk_seccreate(servername, &pkey, win, timehost,
139 ckey, NULL);
140 return (dummy);
141 }
142
143 /*
144 * Slightly modified version of authdessec_create which takes the public key
145 * of the server principal as an argument. This spares us a call to
146 * getpublickey() which in the nameserver context can cause a deadlock.
147 */
148 AUTH *
authdes_pk_seccreate(const char * servername,netobj * pkey,u_int window,const char * timehost,const des_block * ckey,nis_server * srvr)149 authdes_pk_seccreate(const char *servername, netobj *pkey, u_int window,
150 const char *timehost, const des_block *ckey,
151 nis_server *srvr)
152 {
153 AUTH *auth;
154 struct ad_private *ad;
155 char namebuf[MAXNETNAMELEN+1];
156
157 /*
158 * Allocate everything now
159 */
160 auth = ALLOC(AUTH);
161 if (auth == NULL) {
162 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
163 return (NULL);
164 }
165 ad = ALLOC(struct ad_private);
166 if (ad == NULL) {
167 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
168 goto failed;
169 }
170 ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */
171 ad->ad_timehost = NULL;
172 ad->ad_netid = NULL;
173 ad->ad_uaddr = NULL;
174 ad->ad_nis_srvr = NULL;
175 ad->ad_timediff.tv_sec = 0;
176 ad->ad_timediff.tv_usec = 0;
177 memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
178 if (!getnetname(namebuf))
179 goto failed;
180 ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf));
181 ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
182 ad->ad_servernamelen = strlen(servername);
183 ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
184
185 if (ad->ad_fullname == NULL || ad->ad_servername == NULL) {
186 syslog(LOG_ERR, "authdes_seccreate: out of memory");
187 goto failed;
188 }
189 if (timehost != NULL) {
190 ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
191 if (ad->ad_timehost == NULL) {
192 syslog(LOG_ERR, "authdes_seccreate: out of memory");
193 goto failed;
194 }
195 memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1);
196 ad->ad_dosync = TRUE;
197 } else if (srvr != NULL) {
198 ad->ad_nis_srvr = srvr; /* transient */
199 ad->ad_dosync = TRUE;
200 } else {
201 ad->ad_dosync = FALSE;
202 }
203 memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
204 memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1);
205 ad->ad_window = window;
206 if (ckey == NULL) {
207 if (key_gendes(&auth->ah_key) < 0) {
208 syslog(LOG_ERR,
209 "authdes_seccreate: keyserv(1m) is unable to generate session key");
210 goto failed;
211 }
212 } else {
213 auth->ah_key = *ckey;
214 }
215
216 /*
217 * Set up auth handle
218 */
219 auth->ah_cred.oa_flavor = AUTH_DES;
220 auth->ah_verf.oa_flavor = AUTH_DES;
221 auth->ah_ops = authdes_ops();
222 auth->ah_private = (caddr_t)ad;
223
224 if (!authdes_refresh(auth, NULL)) {
225 goto failed;
226 }
227 ad->ad_nis_srvr = NULL; /* not needed any longer */
228 return (auth);
229
230 failed:
231 if (auth)
232 FREE(auth, sizeof (AUTH));
233 if (ad) {
234 if (ad->ad_fullname)
235 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
236 if (ad->ad_servername)
237 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
238 if (ad->ad_timehost)
239 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
240 if (ad->ad_netid)
241 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
242 if (ad->ad_uaddr)
243 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
244 FREE(ad, sizeof (struct ad_private));
245 }
246 return (NULL);
247 }
248
249 /*
250 * Implement the five authentication operations
251 */
252
253
254 /*
255 * 1. Next Verifier
256 */
257 /*ARGSUSED*/
258 static void
authdes_nextverf(AUTH * auth __unused)259 authdes_nextverf(AUTH *auth __unused)
260 {
261 /* what the heck am I supposed to do??? */
262 }
263
264
265 /*
266 * 2. Marshal
267 */
268 static bool_t
authdes_marshal(AUTH * auth,XDR * xdrs)269 authdes_marshal(AUTH *auth, XDR *xdrs)
270 {
271 /* LINTED pointer alignment */
272 struct ad_private *ad = AUTH_PRIVATE(auth);
273 struct authdes_cred *cred = &ad->ad_cred;
274 struct authdes_verf *verf = &ad->ad_verf;
275 des_block cryptbuf[2];
276 des_block ivec;
277 int status;
278 int len;
279 rpc_inline_t *ixdr;
280
281 /*
282 * Figure out the "time", accounting for any time difference
283 * with the server if necessary.
284 */
285 gettimeofday(&ad->ad_timestamp, NULL);
286 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
287 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
288 while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) {
289 ad->ad_timestamp.tv_usec -= USEC_PER_SEC;
290 ad->ad_timestamp.tv_sec++;
291 }
292
293 /*
294 * XDR the timestamp and possibly some other things, then
295 * encrypt them.
296 */
297 ixdr = (rpc_inline_t *)cryptbuf;
298 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec);
299 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec);
300 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
301 IXDR_PUT_U_INT32(ixdr, ad->ad_window);
302 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1);
303 ivec.key.high = ivec.key.low = 0;
304 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
305 (u_int) 2 * sizeof (des_block),
306 DES_ENCRYPT | DES_HW, (char *)&ivec);
307 } else {
308 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
309 (u_int) sizeof (des_block),
310 DES_ENCRYPT | DES_HW);
311 }
312 if (DES_FAILED(status)) {
313 syslog(LOG_ERR, "authdes_marshal: DES encryption failure");
314 return (FALSE);
315 }
316 ad->ad_verf.adv_xtimestamp = cryptbuf[0];
317 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
318 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
319 ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
320 } else {
321 ad->ad_cred.adc_nickname = ad->ad_nickname;
322 ad->ad_verf.adv_winverf = 0;
323 }
324
325 /*
326 * Serialize the credential and verifier into opaque
327 * authentication data.
328 */
329 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
330 len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen);
331 } else {
332 len = (1 + 1)*BYTES_PER_XDR_UNIT;
333 }
334
335 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
336 IXDR_PUT_INT32(ixdr, AUTH_DES);
337 IXDR_PUT_INT32(ixdr, len);
338 } else {
339 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor));
340 ATTEMPT(xdr_putint32(xdrs, &len));
341 }
342 ATTEMPT(xdr_authdes_cred(xdrs, cred));
343
344 len = (2 + 1)*BYTES_PER_XDR_UNIT;
345 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
346 IXDR_PUT_INT32(ixdr, AUTH_DES);
347 IXDR_PUT_INT32(ixdr, len);
348 } else {
349 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor));
350 ATTEMPT(xdr_putint32(xdrs, &len));
351 }
352 ATTEMPT(xdr_authdes_verf(xdrs, verf));
353 return (TRUE);
354 }
355
356
357 /*
358 * 3. Validate
359 */
360 static bool_t
authdes_validate(AUTH * auth,struct opaque_auth * rverf)361 authdes_validate(AUTH *auth, struct opaque_auth *rverf)
362 {
363 /* LINTED pointer alignment */
364 struct ad_private *ad = AUTH_PRIVATE(auth);
365 struct authdes_verf verf;
366 int status;
367 uint32_t *ixdr;
368 des_block buf;
369
370 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) {
371 return (FALSE);
372 }
373 /* LINTED pointer alignment */
374 ixdr = (uint32_t *)rverf->oa_base;
375 buf.key.high = (uint32_t)*ixdr++;
376 buf.key.low = (uint32_t)*ixdr++;
377 verf.adv_int_u = (uint32_t)*ixdr++;
378
379 /*
380 * Decrypt the timestamp
381 */
382 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf,
383 (u_int)sizeof (des_block), DES_DECRYPT | DES_HW);
384
385 if (DES_FAILED(status)) {
386 syslog(LOG_ERR, "authdes_validate: DES decryption failure");
387 return (FALSE);
388 }
389
390 /*
391 * xdr the decrypted timestamp
392 */
393 /* LINTED pointer alignment */
394 ixdr = (uint32_t *)buf.c;
395 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1;
396 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr);
397
398 /*
399 * validate
400 */
401 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
402 sizeof(struct timeval)) != 0) {
403 syslog(LOG_DEBUG, "authdes_validate: verifier mismatch");
404 return (FALSE);
405 }
406
407 /*
408 * We have a nickname now, let's use it
409 */
410 ad->ad_nickname = verf.adv_nickname;
411 ad->ad_cred.adc_namekind = ADN_NICKNAME;
412 return (TRUE);
413 }
414
415 /*
416 * 4. Refresh
417 */
418 /*ARGSUSED*/
419 static bool_t
authdes_refresh(AUTH * auth,void * dummy __unused)420 authdes_refresh(AUTH *auth, void *dummy __unused)
421 {
422 /* LINTED pointer alignment */
423 struct ad_private *ad = AUTH_PRIVATE(auth);
424 struct authdes_cred *cred = &ad->ad_cred;
425 int ok;
426 netobj pkey;
427
428 if (ad->ad_dosync) {
429 ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr,
430 ad->ad_timehost, &(ad->ad_uaddr),
431 &(ad->ad_netid));
432 if (! ok) {
433 /*
434 * Hope the clocks are synced!
435 */
436 ad->ad_dosync = 0;
437 syslog(LOG_DEBUG,
438 "authdes_refresh: unable to synchronize clock");
439 }
440 }
441 ad->ad_xkey = auth->ah_key;
442 pkey.n_bytes = (char *)(ad->ad_pkey);
443 pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1;
444 if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) {
445 syslog(LOG_INFO,
446 "authdes_refresh: keyserv(1m) is unable to encrypt session key");
447 return (FALSE);
448 }
449 cred->adc_fullname.key = ad->ad_xkey;
450 cred->adc_namekind = ADN_FULLNAME;
451 cred->adc_fullname.name = ad->ad_fullname;
452 return (TRUE);
453 }
454
455
456 /*
457 * 5. Destroy
458 */
459 static void
authdes_destroy(AUTH * auth)460 authdes_destroy(AUTH *auth)
461 {
462 /* LINTED pointer alignment */
463 struct ad_private *ad = AUTH_PRIVATE(auth);
464
465 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
466 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
467 if (ad->ad_timehost)
468 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
469 if (ad->ad_netid)
470 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
471 if (ad->ad_uaddr)
472 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
473 FREE(ad, sizeof(struct ad_private));
474 FREE(auth, sizeof(AUTH));
475 }
476
477 static struct auth_ops *
authdes_ops(void)478 authdes_ops(void)
479 {
480 static struct auth_ops ops;
481
482 /* VARIABLES PROTECTED BY ops_lock: ops */
483
484 mutex_lock(&authdes_ops_lock);
485 if (ops.ah_nextverf == NULL) {
486 ops.ah_nextverf = authdes_nextverf;
487 ops.ah_marshal = authdes_marshal;
488 ops.ah_validate = authdes_validate;
489 ops.ah_refresh = authdes_refresh;
490 ops.ah_destroy = authdes_destroy;
491 }
492 mutex_unlock(&authdes_ops_lock);
493 return (&ops);
494 }
495