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 #pragma ident "%Z%%M% %I% %E% SMI"
36
37 /*
38 * auth_des.c, client-side implementation of DES authentication
39 */
40
41 #include <sys/types.h>
42 #include <sys/t_lock.h>
43 #include <sys/time.h>
44 #include <sys/systm.h>
45 #include <sys/socket.h>
46 #include <sys/tiuser.h>
47 #include <sys/errno.h>
48 #include <rpc/des_crypt.h>
49 #include <rpc/types.h>
50 #include <rpc/auth.h>
51 #include <rpc/auth_des.h>
52 #include <rpc/xdr.h>
53 #include <rpc/clnt.h>
54 #include <rpc/rpc_msg.h>
55 #include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */
56 #include <sys/cmn_err.h>
57 #include <sys/debug.h>
58
59 #define MILLION 1000000
60 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */
61
62 #define AUTH_PRIVATE(auth) (struct ad_private *)auth->ah_private
63 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof (object_type))
64 #define FREE(ptr, size) mem_free((char *)(ptr), (int)size)
65 #define ATTEMPT(xdr_op) if (!(xdr_op))\
66 return (FALSE)
67
68 #define gettimeofday(tvp, tzp) uniqtime(tvp)
69
70 static void authdes_nextverf(AUTH *);
71 static bool_t authdes_marshal(AUTH *, XDR *, struct cred *);
72 static bool_t authdes_validate(AUTH *, struct opaque_auth *);
73 static bool_t authdes_refresh(AUTH *, struct rpc_msg *, cred_t *);
74 static void authdes_destroy(AUTH *);
75 static bool_t synchronize(struct knetconfig *, struct netbuf *,
76 int, struct timeval *);
77
78 static struct auth_ops *authdes_ops(void);
79
80 /*
81 * This struct is pointed to by the ah_private field of an "AUTH *"
82 */
83 struct ad_private {
84 char *ad_fullname; /* client's full name */
85 uint_t ad_fullnamelen; /* length of name, rounded up */
86 char *ad_servername; /* server's full name */
87 uint_t ad_servernamelen; /* length of name, rounded up */
88 uint_t ad_window; /* client specified window */
89 bool_t ad_dosync; /* synchronize? */
90 struct netbuf ad_syncaddr; /* remote host to synch with */
91 struct knetconfig ad_synconfig; /* netconfig for the synch host */
92 int ad_calltype; /* use rpc or straight call for sync */
93 struct timeval ad_timediff; /* server's time - client's time */
94 uint32_t ad_nickname; /* server's nickname for client */
95 struct authdes_cred ad_cred; /* storage for credential */
96 struct authdes_verf ad_verf; /* storage for verifier */
97 struct timeval ad_timestamp; /* timestamp sent */
98 des_block ad_xkey; /* encrypted conversation key */
99 };
100
101
102 /*
103 * Create the client des authentication object
104 */
105 /* ARGSUSED */
106 int
authdes_create(char * servername,uint_t window,struct netbuf * syncaddr,struct knetconfig * synconfig,des_block * ckey,int calltype,AUTH ** retauth)107 authdes_create(char *servername, uint_t window, struct netbuf *syncaddr,
108 struct knetconfig *synconfig, des_block *ckey, int calltype,
109 AUTH **retauth)
110 {
111 AUTH *auth;
112 struct ad_private *ad;
113 char namebuf[MAXNETNAMELEN+1];
114 int error = 0;
115 enum clnt_stat stat;
116
117 if (retauth == NULL)
118 return (EINVAL);
119
120 *retauth = NULL;
121
122 /*
123 * Allocate everything now
124 */
125 auth = ALLOC(AUTH);
126 ad = ALLOC(struct ad_private);
127 bzero(ad, sizeof (struct ad_private));
128 if ((stat = kgetnetname(namebuf)) != 0) {
129 cmn_err(CE_NOTE,
130 "authdes_create: unable to get client's netname: %s (error %d)",
131 clnt_sperrno(stat), stat);
132 goto failed;
133 }
134
135 ad->ad_fullnamelen = (uint_t)RNDUP(strlen(namebuf));
136 ad->ad_fullname = mem_alloc(ad->ad_fullnamelen + 1);
137
138 ad->ad_servernamelen = (uint_t)strlen(servername);
139 ad->ad_servername = mem_alloc(ad->ad_servernamelen + 1);
140
141 if (auth == NULL || ad == NULL || ad->ad_fullname == NULL ||
142 ad->ad_servername == NULL) {
143 cmn_err(CE_NOTE, "authdes_create: out of memory");
144 error = ENOMEM;
145 goto failed;
146 }
147
148 /*
149 * Set up private data
150 */
151 bcopy(namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1);
152 bcopy(servername, ad->ad_servername, ad->ad_servernamelen + 1);
153 if (syncaddr != NULL) {
154 ad->ad_syncaddr = *syncaddr;
155 ad->ad_synconfig = *synconfig;
156 ad->ad_dosync = TRUE;
157 ad->ad_calltype = calltype;
158 } else {
159 ad->ad_timediff.tv_sec = 0;
160 ad->ad_timediff.tv_usec = 0;
161 ad->ad_dosync = FALSE;
162 }
163 ad->ad_window = window;
164 if (ckey == NULL) {
165 if ((stat = key_gendes(&auth->ah_key)) != RPC_SUCCESS) {
166 cmn_err(CE_NOTE,
167 "authdes_create: unable to gen conversation key: %s (error %d)",
168 clnt_sperrno(stat), stat);
169 if (stat == RPC_INTR)
170 error = EINTR;
171 else if (stat == RPC_TIMEDOUT)
172 error = ETIMEDOUT;
173 else
174 error = EINVAL; /* XXX */
175 goto failed;
176 }
177 } else
178 auth->ah_key = *ckey;
179
180 /*
181 * Set up auth handle
182 */
183 auth->ah_cred.oa_flavor = AUTH_DES;
184 auth->ah_verf.oa_flavor = AUTH_DES;
185 auth->ah_ops = authdes_ops();
186 auth->ah_private = (caddr_t)ad;
187
188 if (!authdes_refresh(auth, NULL, CRED()))
189 goto failed;
190
191 *retauth = auth;
192 return (0);
193
194 failed:
195 if (ad != NULL && ad->ad_fullname != NULL)
196 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
197 if (ad != NULL && ad->ad_servername != NULL)
198 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
199 if (ad != NULL)
200 FREE(ad, sizeof (struct ad_private));
201 if (auth != NULL)
202 FREE(auth, sizeof (AUTH));
203 return ((error == 0) ? EINVAL : error); /* XXX */
204 }
205
206 /*
207 * Implement the five authentication operations
208 */
209
210 /*
211 * 1. Next Verifier
212 */
213 /* ARGSUSED */
214 static void
authdes_nextverf(AUTH * auth)215 authdes_nextverf(AUTH *auth)
216 {
217 /* what the heck am I supposed to do??? */
218 }
219
220 /*
221 * 2. Marshal
222 */
223 /* ARGSUSED */
224 static bool_t
authdes_marshal(AUTH * auth,XDR * xdrs,struct cred * cr)225 authdes_marshal(AUTH *auth, XDR *xdrs, struct cred *cr)
226 {
227 /* LINTED pointer alignment */
228 struct ad_private *ad = AUTH_PRIVATE(auth);
229 struct authdes_cred *cred = &ad->ad_cred;
230 struct authdes_verf *verf = &ad->ad_verf;
231 des_block cryptbuf[2];
232 des_block ivec;
233 int status;
234 int len;
235 int32_t *ixdr;
236
237 /*
238 * Figure out the "time", accounting for any time difference
239 * with the server if necessary.
240 */
241 (void) gettimeofday(&ad->ad_timestamp, (struct timezone *)NULL);
242 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
243 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
244 if (ad->ad_timestamp.tv_usec >= MILLION) {
245 ad->ad_timestamp.tv_usec -= MILLION;
246 ad->ad_timestamp.tv_sec += 1;
247 }
248
249 /*
250 * XDR the timestamp and possibly some other things, then
251 * encrypt them.
252 */
253 ixdr = (int32_t *)cryptbuf;
254 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec);
255 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec);
256 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
257 IXDR_PUT_U_INT32(ixdr, ad->ad_window);
258 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1);
259 ivec.key.high = ivec.key.low = 0;
260 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
261 2 * sizeof (des_block), DES_ENCRYPT, (char *)&ivec);
262 } else {
263 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
264 sizeof (des_block), DES_ENCRYPT);
265 }
266 if (DES_FAILED(status)) {
267 cmn_err(CE_NOTE, "authdes_marshal: DES encryption failure");
268 return (FALSE);
269 }
270 ad->ad_verf.adv_xtimestamp = cryptbuf[0];
271 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
272 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
273 ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
274 } else {
275 ad->ad_cred.adc_nickname = ad->ad_nickname;
276 ad->ad_verf.adv_winverf = 0;
277 }
278
279 /*
280 * Serialize the credential and verifier into opaque
281 * authentication data.
282 */
283 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
284 len = ((1 + 1 + 2 + 1) * BYTES_PER_XDR_UNIT +
285 ad->ad_fullnamelen);
286 } else
287 len = (1 + 1) * BYTES_PER_XDR_UNIT;
288
289 if (ixdr = xdr_inline(xdrs, 2 * BYTES_PER_XDR_UNIT)) {
290 IXDR_PUT_INT32(ixdr, AUTH_DES);
291 IXDR_PUT_INT32(ixdr, len);
292 } else {
293 ATTEMPT(xdr_putint32(xdrs,
294 (int32_t *)&auth->ah_cred.oa_flavor));
295 ATTEMPT(xdr_putint32(xdrs, (int32_t *)&len));
296 }
297 ATTEMPT(xdr_authdes_cred(xdrs, cred));
298
299 len = (2 + 1) * BYTES_PER_XDR_UNIT;
300 if (ixdr = xdr_inline(xdrs, 2 * BYTES_PER_XDR_UNIT)) {
301 IXDR_PUT_INT32(ixdr, AUTH_DES);
302 IXDR_PUT_INT32(ixdr, len);
303 } else {
304 ATTEMPT(xdr_putint32(xdrs,
305 (int32_t *)&auth->ah_verf.oa_flavor));
306 ATTEMPT(xdr_putint32(xdrs, (int32_t *)&len));
307 }
308 ATTEMPT(xdr_authdes_verf(xdrs, verf));
309 return (TRUE);
310 }
311
312 /*
313 * 3. Validate
314 */
315 static bool_t
authdes_validate(AUTH * auth,struct opaque_auth * rverf)316 authdes_validate(AUTH *auth, struct opaque_auth *rverf)
317 {
318 /* LINTED pointer alignment */
319 struct ad_private *ad = AUTH_PRIVATE(auth);
320 struct authdes_verf verf;
321 int status;
322 uint32_t *ixdr;
323 des_block buf;
324
325 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT)
326 return (FALSE);
327
328 /* LINTED pointer alignment */
329 ixdr = (uint32_t *)rverf->oa_base;
330 buf.key.high = (uint32_t)*ixdr++;
331 buf.key.low = (uint32_t)*ixdr++;
332 verf.adv_int_u = IXDR_GET_U_INT32(ixdr);
333
334 /*
335 * Decrypt the timestamp
336 */
337 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf,
338 sizeof (des_block), DES_DECRYPT);
339
340 if (DES_FAILED(status)) {
341 cmn_err(CE_NOTE, "authdes_validate: DES decryption failure");
342 return (FALSE);
343 }
344
345 /*
346 * xdr the decrypted timestamp
347 */
348 /* LINTED pointer alignment */
349 ixdr = (uint32_t *)buf.c;
350 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1;
351 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr);
352
353 /*
354 * validate
355 */
356 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
357 sizeof (struct timeval)) != 0) {
358 cmn_err(CE_NOTE, "authdes_validate: verifier mismatch");
359 return (FALSE);
360 }
361
362 /*
363 * We have a nickname now, let's use it
364 */
365 ad->ad_nickname = verf.adv_nickname;
366 ad->ad_cred.adc_namekind = ADN_NICKNAME;
367 return (TRUE);
368 }
369
370 /*
371 * 4. Refresh
372 *
373 * msg is a dummy argument here.
374 */
375 /* ARGSUSED */
376 static bool_t
authdes_refresh(AUTH * auth,struct rpc_msg * msg,cred_t * cr)377 authdes_refresh(AUTH *auth, struct rpc_msg *msg, cred_t *cr)
378 {
379 /* LINTED pointer alignment */
380 struct ad_private *ad = AUTH_PRIVATE(auth);
381 struct authdes_cred *cred = &ad->ad_cred;
382 enum clnt_stat stat;
383
384 if (ad->ad_dosync &&
385 !synchronize(&ad->ad_synconfig, &ad->ad_syncaddr,
386 ad->ad_calltype, &ad->ad_timediff)) {
387 /*
388 * Hope the clocks are synced!
389 */
390 timerclear(&ad->ad_timediff);
391 cmn_err(CE_NOTE,
392 "authdes_refresh: unable to synchronize with server %s", ad->ad_servername);
393 }
394 ad->ad_xkey = auth->ah_key;
395 if ((stat = key_encryptsession(ad->ad_servername, &ad->ad_xkey, cr)) !=
396 RPC_SUCCESS) {
397 cmn_err(CE_NOTE,
398 "authdes_refresh: unable to encrypt conversation key for user (uid %d): "
399 "%s (error %d)",
400 (int)crgetuid(cr), clnt_sperrno(stat), stat);
401 return (FALSE);
402 }
403 cred->adc_fullname.key = ad->ad_xkey;
404 cred->adc_namekind = ADN_FULLNAME;
405 cred->adc_fullname.name = ad->ad_fullname;
406 return (TRUE);
407 }
408
409 /*
410 * 5. Destroy
411 */
412 static void
authdes_destroy(AUTH * auth)413 authdes_destroy(AUTH *auth)
414 {
415 /* LINTED pointer alignment */
416 struct ad_private *ad = AUTH_PRIVATE(auth);
417
418 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
419 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
420 FREE(ad, sizeof (struct ad_private));
421 FREE(auth, sizeof (AUTH));
422 }
423
424
425 /*
426 * Synchronize with the server at the given address, that is,
427 * adjust timep to reflect the delta between our clocks
428 */
429 static bool_t
synchronize(struct knetconfig * synconfig,struct netbuf * syncaddr,int calltype,struct timeval * timep)430 synchronize(struct knetconfig *synconfig, struct netbuf *syncaddr, int calltype,
431 struct timeval *timep)
432 {
433 struct timeval mytime;
434 struct timeval timout;
435
436 timout.tv_sec = RTIME_TIMEOUT;
437 timout.tv_usec = 0;
438 if (rtime(synconfig, syncaddr, calltype, timep, &timout) < 0)
439 return (FALSE);
440 (void) gettimeofday(&mytime, (struct timezone *)NULL);
441 timep->tv_sec -= mytime.tv_sec;
442 if (mytime.tv_usec > timep->tv_usec) {
443 timep->tv_sec -= 1;
444 timep->tv_usec += MILLION;
445 }
446 timep->tv_usec -= mytime.tv_usec;
447 return (TRUE);
448 }
449
450 static struct auth_ops *
authdes_ops(void)451 authdes_ops(void)
452 {
453 static struct auth_ops ops;
454
455 mutex_enter(&authdes_ops_lock);
456 if (ops.ah_nextverf == NULL) {
457 ops.ah_nextverf = authdes_nextverf;
458 ops.ah_marshal = authdes_marshal;
459 ops.ah_validate = authdes_validate;
460 ops.ah_refresh = authdes_refresh;
461 ops.ah_destroy = authdes_destroy;
462 ops.ah_wrap = authany_wrap;
463 ops.ah_unwrap = authany_unwrap;
464 }
465 mutex_exit(&authdes_ops_lock);
466 return (&ops);
467 }
468