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800d775e | 1 | /* |
a7ab6ec8 | 2 | * Copyright (c) 2010, Oracle America, Inc. |
cb636bb2 | 3 | * |
a7ab6ec8 UD |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions are | |
6 | * met: | |
cb636bb2 | 7 | * |
a7ab6ec8 UD |
8 | * * Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * * Redistributions in binary form must reproduce the above | |
11 | * copyright notice, this list of conditions and the following | |
12 | * disclaimer in the documentation and/or other materials | |
13 | * provided with the distribution. | |
14 | * * Neither the name of the "Oracle America, 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. | |
800d775e | 17 | * |
a7ab6ec8 UD |
18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
19 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
21 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
22 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
23 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE | |
25 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
27 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
800d775e UD |
30 | */ |
31 | /* | |
32 | * auth_des.c, client-side implementation of DES authentication | |
33 | */ | |
34 | ||
35 | #include <string.h> | |
e054f494 | 36 | #include <stdint.h> |
800d775e UD |
37 | #include <rpc/des_crypt.h> |
38 | #include <rpc/types.h> | |
39 | #include <rpc/auth.h> | |
40 | #include <rpc/auth_des.h> | |
41 | #include <rpc/xdr.h> | |
42 | #include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */ | |
43 | #include <sys/socket.h> | |
44 | ||
45 | #define MILLION 1000000L | |
46 | #define RTIME_TIMEOUT 5 /* seconds to wait for sync */ | |
47 | ||
48 | #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private | |
49 | #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type)) | |
50 | #define FREE(ptr, size) mem_free((char *)(ptr), (int) size) | |
51 | #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE) | |
52 | ||
53 | #define debug(msg) /* printf("%s\n", msg) */ | |
54 | ||
800d775e UD |
55 | |
56 | /* | |
57 | * DES authenticator operations vector | |
58 | */ | |
800d775e UD |
59 | static void authdes_nextverf (AUTH *); |
60 | static bool_t authdes_marshal (AUTH *, XDR *); | |
61 | static bool_t authdes_validate (AUTH *, struct opaque_auth *); | |
62 | static bool_t authdes_refresh (AUTH *); | |
63 | static void authdes_destroy (AUTH *); | |
f8afba91 | 64 | static bool_t synchronize (struct sockaddr *, struct rpc_timeval *) |
dfd2257a | 65 | internal_function; |
800d775e | 66 | |
31d7b14c | 67 | static const struct auth_ops authdes_ops = { |
800d775e UD |
68 | authdes_nextverf, |
69 | authdes_marshal, | |
70 | authdes_validate, | |
71 | authdes_refresh, | |
72 | authdes_destroy | |
73 | }; | |
74 | ||
75 | ||
76 | /* | |
77 | * This struct is pointed to by the ah_private field of an "AUTH *" | |
78 | */ | |
ee586e0e UD |
79 | struct ad_private { |
80 | char *ad_fullname; /* client's full name */ | |
7b57bfe5 UD |
81 | u_int ad_fullnamelen; /* length of name, rounded up */ |
82 | char *ad_servername; /* server's full name */ | |
ee586e0e UD |
83 | u_int ad_servernamelen; /* length of name, rounded up */ |
84 | uint32_t ad_window; /* client specified window */ | |
85 | bool_t ad_dosync; /* synchronize? */ | |
86 | struct sockaddr ad_syncaddr; /* remote host to synch with */ | |
f8afba91 UD |
87 | struct rpc_timeval ad_timediff; /* server's time - client's time */ |
88 | uint32_t ad_nickname; /* server's nickname for client */ | |
ee586e0e UD |
89 | struct authdes_cred ad_cred; /* storage for credential */ |
90 | struct authdes_verf ad_verf; /* storage for verifier */ | |
f8afba91 | 91 | struct rpc_timeval ad_timestamp; /* timestamp sent */ |
ee586e0e | 92 | des_block ad_xkey; /* encrypted conversation key */ |
7b57bfe5 | 93 | u_char ad_pkey[1024]; /* Servers actual public key */ |
ee586e0e | 94 | }; |
800d775e UD |
95 | |
96 | ||
97 | /* | |
98 | * Create the client des authentication object | |
99 | */ | |
100 | AUTH * | |
9a0a462c | 101 | authdes_create (const char *servername, u_int window, |
26a60f90 | 102 | struct sockaddr *syncaddr, des_block *ckey) |
800d775e UD |
103 | /* servername - network name of server */ |
104 | /* window - time to live */ | |
105 | /* syncaddr - optional addr of host to sync with */ | |
106 | /* ckey - optional conversation key to use */ | |
107 | { | |
9cfe5381 | 108 | char pkey_data[1024]; |
800d775e UD |
109 | netobj pkey; |
110 | ||
111 | if (!getpublickey (servername, pkey_data)) | |
f8afba91 | 112 | return NULL; |
800d775e | 113 | |
9cfe5381 RM |
114 | pkey.n_bytes = pkey_data; |
115 | pkey.n_len = strlen (pkey_data) + 1; | |
7b57bfe5 | 116 | return authdes_pk_create (servername, &pkey, window, syncaddr, ckey); |
800d775e | 117 | } |
7b57bfe5 UD |
118 | #ifdef EXPORT_RPC_SYMBOLS |
119 | libc_hidden_def (authdes_create) | |
120 | #else | |
021db4be | 121 | libc_hidden_nolink_sunrpc (authdes_create, GLIBC_2_1) |
7b57bfe5 | 122 | #endif |
800d775e UD |
123 | |
124 | AUTH * | |
26a60f90 UD |
125 | authdes_pk_create (const char *servername, netobj *pkey, u_int window, |
126 | struct sockaddr *syncaddr, des_block *ckey) | |
800d775e UD |
127 | { |
128 | AUTH *auth; | |
129 | struct ad_private *ad; | |
130 | char namebuf[MAXNETNAMELEN + 1]; | |
131 | ||
132 | /* | |
133 | * Allocate everything now | |
134 | */ | |
135 | auth = ALLOC (AUTH); | |
136 | ad = ALLOC (struct ad_private); | |
f8afba91 UD |
137 | |
138 | if (auth == NULL || ad == NULL) | |
139 | { | |
140 | debug ("authdes_create: out of memory"); | |
141 | goto failed; | |
142 | } | |
143 | ||
dfd2257a | 144 | memset (ad, 0, sizeof (struct ad_private)); |
800d775e UD |
145 | memcpy (ad->ad_pkey, pkey->n_bytes, pkey->n_len); |
146 | if (!getnetname (namebuf)) | |
147 | goto failed; | |
148 | ad->ad_fullnamelen = RNDUP (strlen (namebuf)); | |
149 | ad->ad_fullname = mem_alloc (ad->ad_fullnamelen + 1); | |
150 | ||
151 | ad->ad_servernamelen = strlen (servername); | |
152 | ad->ad_servername = mem_alloc (ad->ad_servernamelen + 1); | |
153 | ||
f8afba91 | 154 | if (ad->ad_fullname == NULL || ad->ad_servername == NULL) |
800d775e UD |
155 | { |
156 | debug ("authdes_create: out of memory"); | |
157 | goto failed; | |
158 | } | |
159 | ||
160 | /* | |
161 | * Set up private data | |
162 | */ | |
f8afba91 UD |
163 | memcpy (ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1); |
164 | memcpy (ad->ad_servername, servername, ad->ad_servernamelen + 1); | |
9a0a462c | 165 | ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0; |
800d775e UD |
166 | if (syncaddr != NULL) |
167 | { | |
168 | ad->ad_syncaddr = *syncaddr; | |
169 | ad->ad_dosync = TRUE; | |
170 | } | |
171 | else | |
172 | ad->ad_dosync = FALSE; | |
173 | ||
174 | ad->ad_window = window; | |
175 | if (ckey == NULL) | |
176 | { | |
177 | if (key_gendes (&auth->ah_key) < 0) | |
178 | { | |
179 | debug ("authdes_create: unable to gen conversation key"); | |
1eab3551 | 180 | goto failed; |
800d775e UD |
181 | } |
182 | } | |
183 | else | |
184 | auth->ah_key = *ckey; | |
185 | ||
186 | /* | |
187 | * Set up auth handle | |
188 | */ | |
189 | auth->ah_cred.oa_flavor = AUTH_DES; | |
190 | auth->ah_verf.oa_flavor = AUTH_DES; | |
31d7b14c | 191 | auth->ah_ops = (struct auth_ops *) &authdes_ops; |
800d775e UD |
192 | auth->ah_private = (caddr_t) ad; |
193 | ||
194 | if (!authdes_refresh (auth)) | |
195 | goto failed; | |
196 | ||
f8afba91 | 197 | return auth; |
800d775e UD |
198 | |
199 | failed: | |
200 | if (auth != NULL) | |
201 | FREE (auth, sizeof (AUTH)); | |
202 | if (ad != NULL) | |
9a0a462c | 203 | { |
9a0a462c UD |
204 | if (ad->ad_fullname != NULL) |
205 | FREE (ad->ad_fullname, ad->ad_fullnamelen + 1); | |
206 | if (ad->ad_servername != NULL) | |
207 | FREE (ad->ad_servername, ad->ad_servernamelen + 1); | |
dfd2257a | 208 | FREE (ad, sizeof (struct ad_private)); |
9a0a462c | 209 | } |
f8afba91 | 210 | return NULL; |
800d775e | 211 | } |
7b57bfe5 UD |
212 | #ifdef EXPORT_RPC_SYMBOLS |
213 | libc_hidden_def (authdes_pk_create) | |
214 | #else | |
021db4be | 215 | libc_hidden_nolink_sunrpc (authdes_pk_create, GLIBC_2_1) |
7b57bfe5 | 216 | #endif |
800d775e UD |
217 | |
218 | /* | |
219 | * Implement the five authentication operations | |
220 | */ | |
221 | ||
222 | ||
223 | /* | |
224 | * 1. Next Verifier | |
225 | */ | |
226 | /*ARGSUSED */ | |
227 | static void | |
f8afba91 | 228 | authdes_nextverf (AUTH *auth) |
800d775e UD |
229 | { |
230 | /* what the heck am I supposed to do??? */ | |
231 | } | |
232 | ||
233 | ||
234 | ||
235 | /* | |
236 | * 2. Marshal | |
237 | */ | |
238 | static bool_t | |
f8afba91 | 239 | authdes_marshal (AUTH *auth, XDR *xdrs) |
800d775e UD |
240 | { |
241 | struct ad_private *ad = AUTH_PRIVATE (auth); | |
242 | struct authdes_cred *cred = &ad->ad_cred; | |
243 | struct authdes_verf *verf = &ad->ad_verf; | |
244 | des_block cryptbuf[2]; | |
245 | des_block ivec; | |
246 | int status; | |
9cfe5381 | 247 | int len; |
f8afba91 UD |
248 | register int32_t *ixdr; |
249 | struct timeval tval; | |
800d775e UD |
250 | |
251 | /* | |
252 | * Figure out the "time", accounting for any time difference | |
253 | * with the server if necessary. | |
254 | */ | |
f8afba91 UD |
255 | __gettimeofday (&tval, (struct timezone *) NULL); |
256 | ad->ad_timestamp.tv_sec = tval.tv_sec + ad->ad_timediff.tv_sec; | |
257 | ad->ad_timestamp.tv_usec = tval.tv_usec + ad->ad_timediff.tv_usec; | |
800d775e UD |
258 | if (ad->ad_timestamp.tv_usec >= MILLION) |
259 | { | |
260 | ad->ad_timestamp.tv_usec -= MILLION; | |
261 | ad->ad_timestamp.tv_sec += 1; | |
262 | } | |
263 | ||
264 | /* | |
265 | * XDR the timestamp and possibly some other things, then | |
266 | * encrypt them. | |
ee586e0e | 267 | * XXX We have a real Year 2038 problem here. |
800d775e | 268 | */ |
f8afba91 UD |
269 | ixdr = (int32_t *) cryptbuf; |
270 | IXDR_PUT_INT32 (ixdr, ad->ad_timestamp.tv_sec); | |
271 | IXDR_PUT_INT32 (ixdr, ad->ad_timestamp.tv_usec); | |
800d775e UD |
272 | if (ad->ad_cred.adc_namekind == ADN_FULLNAME) |
273 | { | |
ee586e0e UD |
274 | IXDR_PUT_U_INT32 (ixdr, ad->ad_window); |
275 | IXDR_PUT_U_INT32 (ixdr, ad->ad_window - 1); | |
800d775e UD |
276 | ivec.key.high = ivec.key.low = 0; |
277 | status = cbc_crypt ((char *) &auth->ah_key, (char *) cryptbuf, | |
278 | 2 * sizeof (des_block), DES_ENCRYPT | DES_HW, (char *) &ivec); | |
279 | } | |
280 | else | |
f8afba91 UD |
281 | status = ecb_crypt ((char *) &auth->ah_key, (char *) cryptbuf, |
282 | sizeof (des_block), DES_ENCRYPT | DES_HW); | |
283 | ||
800d775e UD |
284 | if (DES_FAILED (status)) |
285 | { | |
286 | debug ("authdes_marshal: DES encryption failure"); | |
f8afba91 | 287 | return FALSE; |
800d775e UD |
288 | } |
289 | ad->ad_verf.adv_xtimestamp = cryptbuf[0]; | |
290 | if (ad->ad_cred.adc_namekind == ADN_FULLNAME) | |
291 | { | |
292 | ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high; | |
293 | ad->ad_verf.adv_winverf = cryptbuf[1].key.low; | |
294 | } | |
295 | else | |
296 | { | |
297 | ad->ad_cred.adc_nickname = ad->ad_nickname; | |
298 | ad->ad_verf.adv_winverf = 0; | |
299 | } | |
300 | ||
301 | /* | |
302 | * Serialize the credential and verifier into opaque | |
303 | * authentication data. | |
304 | */ | |
305 | if (ad->ad_cred.adc_namekind == ADN_FULLNAME) | |
f8afba91 | 306 | len = ((1 + 1 + 2 + 1) * BYTES_PER_XDR_UNIT + ad->ad_fullnamelen); |
800d775e | 307 | else |
f8afba91 | 308 | len = (1 + 1) * BYTES_PER_XDR_UNIT; |
800d775e UD |
309 | |
310 | if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL) | |
311 | { | |
ee586e0e UD |
312 | IXDR_PUT_INT32 (ixdr, AUTH_DES); |
313 | IXDR_PUT_U_INT32 (ixdr, len); | |
800d775e UD |
314 | } |
315 | else | |
316 | { | |
ee586e0e UD |
317 | ATTEMPT (xdr_putint32 (xdrs, &auth->ah_cred.oa_flavor)); |
318 | ATTEMPT (xdr_putint32 (xdrs, &len)); | |
800d775e | 319 | } |
7b57bfe5 | 320 | ATTEMPT (xdr_authdes_cred (xdrs, cred)); |
800d775e UD |
321 | |
322 | len = (2 + 1) * BYTES_PER_XDR_UNIT; | |
323 | if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL) | |
324 | { | |
ee586e0e UD |
325 | IXDR_PUT_INT32 (ixdr, AUTH_DES); |
326 | IXDR_PUT_U_INT32 (ixdr, len); | |
800d775e UD |
327 | } |
328 | else | |
329 | { | |
ee586e0e UD |
330 | ATTEMPT (xdr_putint32 (xdrs, &auth->ah_verf.oa_flavor)); |
331 | ATTEMPT (xdr_putint32 (xdrs, &len)); | |
800d775e | 332 | } |
7b57bfe5 | 333 | ATTEMPT (xdr_authdes_verf (xdrs, verf)); |
f8afba91 | 334 | |
ee586e0e | 335 | return TRUE; |
800d775e UD |
336 | } |
337 | ||
338 | ||
339 | /* | |
340 | * 3. Validate | |
341 | */ | |
342 | static bool_t | |
ee586e0e | 343 | authdes_validate (AUTH *auth, struct opaque_auth *rverf) |
800d775e UD |
344 | { |
345 | struct ad_private *ad = AUTH_PRIVATE (auth); | |
346 | struct authdes_verf verf; | |
347 | int status; | |
f8afba91 | 348 | register uint32_t *ixdr; |
800d775e UD |
349 | |
350 | if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) | |
f8afba91 | 351 | return FALSE; |
800d775e | 352 | |
f8afba91 UD |
353 | ixdr = (uint32_t *) rverf->oa_base; |
354 | verf.adv_xtimestamp.key.high = *ixdr++; | |
355 | verf.adv_xtimestamp.key.low = *ixdr++; | |
356 | verf.adv_int_u = *ixdr++; /* nickname not XDR'd ! */ | |
800d775e UD |
357 | |
358 | /* | |
359 | * Decrypt the timestamp | |
360 | */ | |
361 | status = ecb_crypt ((char *) &auth->ah_key, (char *) &verf.adv_xtimestamp, | |
362 | sizeof (des_block), DES_DECRYPT | DES_HW); | |
363 | ||
364 | if (DES_FAILED (status)) | |
365 | { | |
366 | debug ("authdes_validate: DES decryption failure"); | |
ee586e0e | 367 | return FALSE; |
800d775e UD |
368 | } |
369 | ||
370 | /* | |
371 | * xdr the decrypted timestamp | |
372 | */ | |
f8afba91 UD |
373 | ixdr = (uint32_t *) verf.adv_xtimestamp.c; |
374 | verf.adv_timestamp.tv_sec = IXDR_GET_U_INT32 (ixdr) + 1; | |
375 | verf.adv_timestamp.tv_usec = IXDR_GET_U_INT32 (ixdr); | |
800d775e UD |
376 | |
377 | /* | |
378 | * validate | |
379 | */ | |
50304ef0 | 380 | if (memcmp ((char *) &ad->ad_timestamp, (char *) &verf.adv_timestamp, |
f8afba91 | 381 | sizeof (struct rpc_timeval)) != 0) |
800d775e UD |
382 | { |
383 | debug ("authdes_validate: verifier mismatch\n"); | |
ee586e0e | 384 | return FALSE; |
800d775e UD |
385 | } |
386 | ||
387 | /* | |
388 | * We have a nickname now, let's use it | |
389 | */ | |
390 | ad->ad_nickname = verf.adv_nickname; | |
391 | ad->ad_cred.adc_namekind = ADN_NICKNAME; | |
ee586e0e | 392 | return TRUE; |
800d775e UD |
393 | } |
394 | ||
395 | /* | |
396 | * 4. Refresh | |
397 | */ | |
398 | static bool_t | |
ee586e0e | 399 | authdes_refresh (AUTH *auth) |
800d775e UD |
400 | { |
401 | netobj pkey; | |
402 | struct ad_private *ad = AUTH_PRIVATE (auth); | |
403 | struct authdes_cred *cred = &ad->ad_cred; | |
404 | ||
f8afba91 | 405 | if (ad->ad_dosync && !synchronize (&ad->ad_syncaddr, &ad->ad_timediff)) |
800d775e UD |
406 | { |
407 | /* | |
408 | * Hope the clocks are synced! | |
409 | */ | |
410 | ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0; | |
411 | debug ("authdes_refresh: unable to synchronize with server"); | |
412 | } | |
413 | ad->ad_xkey = auth->ah_key; | |
414 | pkey.n_bytes = (char *) (ad->ad_pkey); | |
415 | pkey.n_len = strlen ((char *) ad->ad_pkey) + 1; | |
416 | if (key_encryptsession_pk (ad->ad_servername, &pkey, &ad->ad_xkey) < 0) | |
417 | { | |
418 | debug ("authdes_create: unable to encrypt conversation key"); | |
ee586e0e | 419 | return FALSE; |
800d775e UD |
420 | } |
421 | cred->adc_fullname.key = ad->ad_xkey; | |
422 | cred->adc_namekind = ADN_FULLNAME; | |
423 | cred->adc_fullname.name = ad->ad_fullname; | |
ee586e0e | 424 | return TRUE; |
800d775e UD |
425 | } |
426 | ||
427 | /* | |
428 | * 5. Destroy | |
429 | */ | |
430 | static void | |
ee586e0e | 431 | authdes_destroy (AUTH *auth) |
800d775e UD |
432 | { |
433 | struct ad_private *ad = AUTH_PRIVATE (auth); | |
434 | ||
435 | FREE (ad->ad_fullname, ad->ad_fullnamelen + 1); | |
436 | FREE (ad->ad_servername, ad->ad_servernamelen + 1); | |
437 | FREE (ad, sizeof (struct ad_private)); | |
438 | FREE (auth, sizeof (AUTH)); | |
439 | } | |
440 | ||
441 | /* | |
442 | * Synchronize with the server at the given address, that is, | |
443 | * adjust timep to reflect the delta between our clocks | |
444 | */ | |
445 | static bool_t | |
dfd2257a | 446 | internal_function |
f8afba91 | 447 | synchronize (struct sockaddr *syncaddr, struct rpc_timeval *timep) |
800d775e UD |
448 | { |
449 | struct timeval mytime; | |
f8afba91 | 450 | struct rpc_timeval timeout; |
800d775e UD |
451 | |
452 | timeout.tv_sec = RTIME_TIMEOUT; | |
453 | timeout.tv_usec = 0; | |
454 | if (rtime ((struct sockaddr_in *) syncaddr, timep, &timeout) < 0) | |
ee586e0e | 455 | return FALSE; |
800d775e | 456 | |
50304ef0 | 457 | __gettimeofday (&mytime, (struct timezone *) NULL); |
800d775e UD |
458 | timep->tv_sec -= mytime.tv_sec; |
459 | if (mytime.tv_usec > timep->tv_usec) | |
460 | { | |
461 | timep->tv_sec -= 1; | |
462 | timep->tv_usec += MILLION; | |
463 | } | |
464 | timep->tv_usec -= mytime.tv_usec; | |
ee586e0e | 465 | return TRUE; |
800d775e | 466 | } |