1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
33 */
34
35 /*
36 * auth_des.c, client-side implementation of DES authentication
37 */
38
39 #include <sys/types.h>
40 #include <sys/t_lock.h>
41 #include <sys/time.h>
42 #include <sys/systm.h>
43 #include <sys/socket.h>
44 #include <sys/tiuser.h>
45 #include <sys/errno.h>
46 #include <rpc/des_crypt.h>
47 #include <rpc/types.h>
48 #include <rpc/auth.h>
49 #include <rpc/auth_des.h>
50 #include <rpc/xdr.h>
51 #include <rpc/clnt.h>
52 #include <rpc/rpc_msg.h>
53 #include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */
54 #include <sys/cmn_err.h>
55 #include <sys/debug.h>
56
57 #define MILLION 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))\
64 return (FALSE)
65
66 #define gettimeofday(tvp, tzp) uniqtime(tvp)
67
68 static void authdes_nextverf(AUTH *);
69 static bool_t authdes_marshal(AUTH *, XDR *, struct cred *);
70 static bool_t authdes_validate(AUTH *, struct opaque_auth *);
71 static bool_t authdes_refresh(AUTH *, struct rpc_msg *, cred_t *);
72 static void authdes_destroy(AUTH *);
73 static bool_t synchronize(struct knetconfig *, struct netbuf *,
74 int, struct timeval *);
75
76 static struct auth_ops *authdes_ops(void);
77
78 /*
79 * This struct is pointed to by the ah_private field of an "AUTH *"
80 */
81 struct ad_private {
82 char *ad_fullname; /* client's full name */
83 uint_t ad_fullnamelen; /* length of name, rounded up */
84 char *ad_servername; /* server's full name */
85 uint_t ad_servernamelen; /* length of name, rounded up */
86 uint_t ad_window; /* client specified window */
87 bool_t ad_dosync; /* synchronize? */
88 struct netbuf ad_syncaddr; /* remote host to synch with */
89 struct knetconfig ad_synconfig; /* netconfig for the synch host */
90 int ad_calltype; /* use rpc or straight call for sync */
91 struct timeval ad_timediff; /* server's time - client's time */
92 uint32_t ad_nickname; /* server's nickname for client */
93 struct authdes_cred ad_cred; /* storage for credential */
94 struct authdes_verf ad_verf; /* storage for verifier */
95 struct timeval ad_timestamp; /* timestamp sent */
96 des_block ad_xkey; /* encrypted conversation key */
97 };
98
99
100 /*
101 * Create the client des authentication object
102 */
103 /* ARGSUSED */
104 int
authdes_create(char * servername,uint_t window,struct netbuf * syncaddr,struct knetconfig * synconfig,des_block * ckey,int calltype,AUTH ** retauth)105 authdes_create(char *servername, uint_t window, struct netbuf *syncaddr,
106 struct knetconfig *synconfig, des_block *ckey, int calltype,
107 AUTH **retauth)
108 {
109 AUTH *auth;
110 struct ad_private *ad;
111 char namebuf[MAXNETNAMELEN+1];
112 int error = 0;
113 enum clnt_stat stat;
114
115 if (retauth == NULL)
116 return (EINVAL);
117
118 *retauth = NULL;
119
120 /*
121 * Allocate everything now
122 */
123 auth = ALLOC(AUTH);
124 ad = ALLOC(struct ad_private);
125 bzero(ad, sizeof (struct ad_private));
126 if ((stat = kgetnetname(namebuf)) != 0) {
127 cmn_err(CE_NOTE,
128 "authdes_create: unable to get client's netname: %s (error %d)",
129 clnt_sperrno(stat), stat);
130 goto failed;
131 }
132
133 ad->ad_fullnamelen = (uint_t)RNDUP(strlen(namebuf));
134 ad->ad_fullname = mem_alloc(ad->ad_fullnamelen + 1);
135
136 ad->ad_servernamelen = (uint_t)strlen(servername);
137 ad->ad_servername = mem_alloc(ad->ad_servernamelen + 1);
138
139 if (auth == NULL || ad == NULL || ad->ad_fullname == NULL ||
140 ad->ad_servername == NULL) {
141 cmn_err(CE_NOTE, "authdes_create: out of memory");
142 error = ENOMEM;
143 goto failed;
144 }
145
146 /*
147 * Set up private data
148 */
149 bcopy(namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1);
150 bcopy(servername, ad->ad_servername, ad->ad_servernamelen + 1);
151 if (syncaddr != NULL) {
152 ad->ad_syncaddr = *syncaddr;
153 ad->ad_synconfig = *synconfig;
154 ad->ad_dosync = TRUE;
155 ad->ad_calltype = calltype;
156 } else {
157 ad->ad_timediff.tv_sec = 0;
158 ad->ad_timediff.tv_usec = 0;
159 ad->ad_dosync = FALSE;
160 }
161 ad->ad_window = window;
162 if (ckey == NULL) {
163 if ((stat = key_gendes(&auth->ah_key)) != RPC_SUCCESS) {
164 cmn_err(CE_NOTE,
165 "authdes_create: unable to gen conversation key: %s (error %d)",
166 clnt_sperrno(stat), stat);
167 if (stat == RPC_INTR)
168 error = EINTR;
169 else if (stat == RPC_TIMEDOUT)
170 error = ETIMEDOUT;
171 else
172 error = EINVAL; /* XXX */
173 goto failed;
174 }
175 } else
176 auth->ah_key = *ckey;
177
178 /*
179 * Set up auth handle
180 */
181 auth->ah_cred.oa_flavor = AUTH_DES;
182 auth->ah_verf.oa_flavor = AUTH_DES;
183 auth->ah_ops = authdes_ops();
184 auth->ah_private = (caddr_t)ad;
185
186 if (!authdes_refresh(auth, NULL, CRED()))
187 goto failed;
188
189 *retauth = auth;
190 return (0);
191
192 failed:
193 if (ad != NULL && ad->ad_fullname != NULL)
194 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
195 if (ad != NULL && ad->ad_servername != NULL)
196 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
197 if (ad != NULL)
198 FREE(ad, sizeof (struct ad_private));
199 if (auth != NULL)
200 FREE(auth, sizeof (AUTH));
201 return ((error == 0) ? EINVAL : error); /* XXX */
202 }
203
204 /*
205 * Implement the five authentication operations
206 */
207
208 /*
209 * 1. Next Verifier
210 */
211 /* ARGSUSED */
212 static void
authdes_nextverf(AUTH * auth)213 authdes_nextverf(AUTH *auth)
214 {
215 /* what the heck am I supposed to do??? */
216 }
217
218 /*
219 * 2. Marshal
220 */
221 /* ARGSUSED */
222 static bool_t
authdes_marshal(AUTH * auth,XDR * xdrs,struct cred * cr)223 authdes_marshal(AUTH *auth, XDR *xdrs, struct cred *cr)
224 {
225 /* LINTED pointer alignment */
226 struct ad_private *ad = AUTH_PRIVATE(auth);
227 struct authdes_cred *cred = &ad->ad_cred;
228 struct authdes_verf *verf = &ad->ad_verf;
229 des_block cryptbuf[2];
230 des_block ivec;
231 int status;
232 int len;
233 int32_t *ixdr;
234
235 /*
236 * Figure out the "time", accounting for any time difference
237 * with the server if necessary.
238 */
239 (void) gettimeofday(&ad->ad_timestamp, (struct timezone *)NULL);
240 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
241 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
242 if (ad->ad_timestamp.tv_usec >= MILLION) {
243 ad->ad_timestamp.tv_usec -= MILLION;
244 ad->ad_timestamp.tv_sec += 1;
245 }
246
247 /*
248 * XDR the timestamp and possibly some other things, then
249 * encrypt them.
250 */
251 ixdr = (int32_t *)cryptbuf;
252 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec);
253 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec);
254 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
255 IXDR_PUT_U_INT32(ixdr, ad->ad_window);
256 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1);
257 ivec.key.high = ivec.key.low = 0;
258 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
259 2 * sizeof (des_block), DES_ENCRYPT, (char *)&ivec);
260 } else {
261 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
262 sizeof (des_block), DES_ENCRYPT);
263 }
264 if (DES_FAILED(status)) {
265 cmn_err(CE_NOTE, "authdes_marshal: DES encryption failure");
266 return (FALSE);
267 }
268 ad->ad_verf.adv_xtimestamp = cryptbuf[0];
269 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
270 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
271 ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
272 } else {
273 ad->ad_cred.adc_nickname = ad->ad_nickname;
274 ad->ad_verf.adv_winverf = 0;
275 }
276
277 /*
278 * Serialize the credential and verifier into opaque
279 * authentication data.
280 */
281 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
282 len = ((1 + 1 + 2 + 1) * BYTES_PER_XDR_UNIT +
283 ad->ad_fullnamelen);
284 } else
285 len = (1 + 1) * BYTES_PER_XDR_UNIT;
286
287 if (ixdr = xdr_inline(xdrs, 2 * BYTES_PER_XDR_UNIT)) {
288 IXDR_PUT_INT32(ixdr, AUTH_DES);
289 IXDR_PUT_INT32(ixdr, len);
290 } else {
291 ATTEMPT(xdr_putint32(xdrs,
292 (int32_t *)&auth->ah_cred.oa_flavor));
293 ATTEMPT(xdr_putint32(xdrs, (int32_t *)&len));
294 }
295 ATTEMPT(xdr_authdes_cred(xdrs, cred));
296
297 len = (2 + 1) * BYTES_PER_XDR_UNIT;
298 if (ixdr = xdr_inline(xdrs, 2 * BYTES_PER_XDR_UNIT)) {
299 IXDR_PUT_INT32(ixdr, AUTH_DES);
300 IXDR_PUT_INT32(ixdr, len);
301 } else {
302 ATTEMPT(xdr_putint32(xdrs,
303 (int32_t *)&auth->ah_verf.oa_flavor));
304 ATTEMPT(xdr_putint32(xdrs, (int32_t *)&len));
305 }
306 ATTEMPT(xdr_authdes_verf(xdrs, verf));
307 return (TRUE);
308 }
309
310 /*
311 * 3. Validate
312 */
313 static bool_t
authdes_validate(AUTH * auth,struct opaque_auth * rverf)314 authdes_validate(AUTH *auth, struct opaque_auth *rverf)
315 {
316 /* LINTED pointer alignment */
317 struct ad_private *ad = AUTH_PRIVATE(auth);
318 struct authdes_verf verf;
319 int status;
320 uint32_t *ixdr;
321 des_block buf;
322
323 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT)
324 return (FALSE);
325
326 /* LINTED pointer alignment */
327 ixdr = (uint32_t *)rverf->oa_base;
328 buf.key.high = (uint32_t)*ixdr++;
329 buf.key.low = (uint32_t)*ixdr++;
330 verf.adv_int_u = IXDR_GET_U_INT32(ixdr);
331
332 /*
333 * Decrypt the timestamp
334 */
335 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf,
336 sizeof (des_block), DES_DECRYPT);
337
338 if (DES_FAILED(status)) {
339 cmn_err(CE_NOTE, "authdes_validate: DES decryption failure");
340 return (FALSE);
341 }
342
343 /*
344 * xdr the decrypted timestamp
345 */
346 /* LINTED pointer alignment */
347 ixdr = (uint32_t *)buf.c;
348 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1;
349 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr);
350
351 /*
352 * validate
353 */
354 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
355 sizeof (struct timeval)) != 0) {
356 cmn_err(CE_NOTE, "authdes_validate: verifier mismatch");
357 return (FALSE);
358 }
359
360 /*
361 * We have a nickname now, let's use it
362 */
363 ad->ad_nickname = verf.adv_nickname;
364 ad->ad_cred.adc_namekind = ADN_NICKNAME;
365 return (TRUE);
366 }
367
368 /*
369 * 4. Refresh
370 *
371 * msg is a dummy argument here.
372 */
373 /* ARGSUSED */
374 static bool_t
authdes_refresh(AUTH * auth,struct rpc_msg * msg,cred_t * cr)375 authdes_refresh(AUTH *auth, struct rpc_msg *msg, cred_t *cr)
376 {
377 /* LINTED pointer alignment */
378 struct ad_private *ad = AUTH_PRIVATE(auth);
379 struct authdes_cred *cred = &ad->ad_cred;
380 enum clnt_stat stat;
381
382 if (ad->ad_dosync &&
383 !synchronize(&ad->ad_synconfig, &ad->ad_syncaddr,
384 ad->ad_calltype, &ad->ad_timediff)) {
385 /*
386 * Hope the clocks are synced!
387 */
388 timerclear(&ad->ad_timediff);
389 cmn_err(CE_NOTE,
390 "authdes_refresh: unable to synchronize with server %s", ad->ad_servername);
391 }
392 ad->ad_xkey = auth->ah_key;
393 if ((stat = key_encryptsession(ad->ad_servername, &ad->ad_xkey, cr)) !=
394 RPC_SUCCESS) {
395 cmn_err(CE_NOTE,
396 "authdes_refresh: unable to encrypt conversation key for user (uid %d): "
397 "%s (error %d)",
398 (int)crgetuid(cr), clnt_sperrno(stat), stat);
399 return (FALSE);
400 }
401 cred->adc_fullname.key = ad->ad_xkey;
402 cred->adc_namekind = ADN_FULLNAME;
403 cred->adc_fullname.name = ad->ad_fullname;
404 return (TRUE);
405 }
406
407 /*
408 * 5. Destroy
409 */
410 static void
authdes_destroy(AUTH * auth)411 authdes_destroy(AUTH *auth)
412 {
413 /* LINTED pointer alignment */
414 struct ad_private *ad = AUTH_PRIVATE(auth);
415
416 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
417 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
418 FREE(ad, sizeof (struct ad_private));
419 FREE(auth, sizeof (AUTH));
420 }
421
422
423 /*
424 * Synchronize with the server at the given address, that is,
425 * adjust timep to reflect the delta between our clocks
426 */
427 static bool_t
synchronize(struct knetconfig * synconfig,struct netbuf * syncaddr,int calltype,struct timeval * timep)428 synchronize(struct knetconfig *synconfig, struct netbuf *syncaddr, int calltype,
429 struct timeval *timep)
430 {
431 struct timeval mytime;
432 struct timeval timout;
433
434 timout.tv_sec = RTIME_TIMEOUT;
435 timout.tv_usec = 0;
436 if (rtime(synconfig, syncaddr, calltype, timep, &timout) < 0)
437 return (FALSE);
438 (void) gettimeofday(&mytime, (struct timezone *)NULL);
439 timep->tv_sec -= mytime.tv_sec;
440 if (mytime.tv_usec > timep->tv_usec) {
441 timep->tv_sec -= 1;
442 timep->tv_usec += MILLION;
443 }
444 timep->tv_usec -= mytime.tv_usec;
445 return (TRUE);
446 }
447
448 static struct auth_ops *
authdes_ops(void)449 authdes_ops(void)
450 {
451 static struct auth_ops ops;
452
453 mutex_enter(&authdes_ops_lock);
454 if (ops.ah_nextverf == NULL) {
455 ops.ah_nextverf = authdes_nextverf;
456 ops.ah_marshal = authdes_marshal;
457 ops.ah_validate = authdes_validate;
458 ops.ah_refresh = authdes_refresh;
459 ops.ah_destroy = authdes_destroy;
460 ops.ah_wrap = authany_wrap;
461 ops.ah_unwrap = authany_unwrap;
462 }
463 mutex_exit(&authdes_ops_lock);
464 return (&ops);
465 }
466