summary refs log tree commit diff
path: root/sunrpc/auth_des.c
blob: 0228562b89ceaaa2a404794c4aa707f05c24caeb (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of the "Oracle America, Inc." nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * auth_des.c, client-side implementation of DES authentication
 */

#include <string.h>
#include <rpc/des_crypt.h>
#include <rpc/types.h>
#include <rpc/auth.h>
#include <rpc/auth_des.h>
#include <rpc/xdr.h>
#include <netinet/in.h>		/* XXX: just to get htonl() and ntohl() */
#include <sys/socket.h>

#define MILLION		1000000L
#define RTIME_TIMEOUT 5		/* seconds to wait for sync */

#define AUTH_PRIVATE(auth)	(struct ad_private *) auth->ah_private
#define ALLOC(object_type)	(object_type *) mem_alloc(sizeof(object_type))
#define FREE(ptr, size)		mem_free((char *)(ptr), (int) size)
#define ATTEMPT(xdr_op)		if (!(xdr_op)) return (FALSE)

#define debug(msg)		/* printf("%s\n", msg) */

extern bool_t INTUSE(xdr_authdes_cred) (XDR *, struct authdes_cred *);
extern bool_t INTUSE(xdr_authdes_verf) (XDR *, struct authdes_verf *);

/*
 * DES authenticator operations vector
 */
static void authdes_nextverf (AUTH *);
static bool_t authdes_marshal (AUTH *, XDR *);
static bool_t authdes_validate (AUTH *, struct opaque_auth *);
static bool_t authdes_refresh (AUTH *);
static void authdes_destroy (AUTH *);
static bool_t synchronize (struct sockaddr *, struct rpc_timeval *)
     internal_function;

static const struct auth_ops authdes_ops = {
  authdes_nextverf,
  authdes_marshal,
  authdes_validate,
  authdes_refresh,
  authdes_destroy
};


/*
 * This struct is pointed to by the ah_private field of an "AUTH *"
 */
struct ad_private {
  char *ad_fullname;		/* client's full name */
  u_int ad_fullnamelen;	        /* length of name, rounded up */
  char *ad_servername;	        /* server's full name */
  u_int ad_servernamelen;	/* length of name, rounded up */
  uint32_t ad_window;		/* client specified window */
  bool_t ad_dosync;		/* synchronize? */
  struct sockaddr ad_syncaddr;	/* remote host to synch with */
  struct rpc_timeval ad_timediff;	/* server's time - client's time */
  uint32_t ad_nickname;		/* server's nickname for client */
  struct authdes_cred ad_cred;	/* storage for credential */
  struct authdes_verf ad_verf;	/* storage for verifier */
  struct rpc_timeval ad_timestamp;	/* timestamp sent */
  des_block ad_xkey;		/* encrypted conversation key */
  u_char ad_pkey[1024];	        /* Servers actual public key */
};


/*
 * Create the client des authentication object
 */
AUTH *
authdes_create (const char *servername, u_int window,
		struct sockaddr *syncaddr, des_block *ckey)
  /* servername - network name of server */
  /* window     - time to live */
  /* syncaddr   - optional addr of host to sync with */
  /* ckey       - optional conversation key to use */
{
  char pkey_data[1024];
  netobj pkey;

  if (!getpublickey (servername, pkey_data))
    return NULL;

  pkey.n_bytes = pkey_data;
  pkey.n_len = strlen (pkey_data) + 1;
  return INTUSE(authdes_pk_create) (servername, &pkey, window, syncaddr, ckey);
}

AUTH *
authdes_pk_create (const char *servername, netobj *pkey, u_int window,
		   struct sockaddr *syncaddr, des_block *ckey)
{
  AUTH *auth;
  struct ad_private *ad;
  char namebuf[MAXNETNAMELEN + 1];

  /*
   * Allocate everything now
   */
  auth = ALLOC (AUTH);
  ad = ALLOC (struct ad_private);

  if (auth == NULL || ad == NULL)
    {
      debug ("authdes_create: out of memory");
      goto failed;
    }

  memset (ad, 0, sizeof (struct ad_private));
  memcpy (ad->ad_pkey, pkey->n_bytes, pkey->n_len);
  if (!getnetname (namebuf))
    goto failed;
  ad->ad_fullnamelen = RNDUP (strlen (namebuf));
  ad->ad_fullname = mem_alloc (ad->ad_fullnamelen + 1);

  ad->ad_servernamelen = strlen (servername);
  ad->ad_servername = mem_alloc (ad->ad_servernamelen + 1);

  if (ad->ad_fullname == NULL || ad->ad_servername == NULL)
    {
      debug ("authdes_create: out of memory");
      goto failed;
    }

  /*
   * Set up private data
   */
  memcpy (ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
  memcpy (ad->ad_servername, servername, ad->ad_servernamelen + 1);
  ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0;
  if (syncaddr != NULL)
    {
      ad->ad_syncaddr = *syncaddr;
      ad->ad_dosync = TRUE;
    }
  else
    ad->ad_dosync = FALSE;

  ad->ad_window = window;
  if (ckey == NULL)
    {
      if (key_gendes (&auth->ah_key) < 0)
	{
	  debug ("authdes_create: unable to gen conversation key");
	  goto failed;
	}
    }
  else
    auth->ah_key = *ckey;

  /*
   * Set up auth handle
   */
  auth->ah_cred.oa_flavor = AUTH_DES;
  auth->ah_verf.oa_flavor = AUTH_DES;
  auth->ah_ops = (struct auth_ops *) &authdes_ops;
  auth->ah_private = (caddr_t) ad;

  if (!authdes_refresh (auth))
    goto failed;

  return auth;

failed:
  if (auth != NULL)
    FREE (auth, sizeof (AUTH));
  if (ad != NULL)
    {
      if (ad->ad_fullname != NULL)
	FREE (ad->ad_fullname, ad->ad_fullnamelen + 1);
      if (ad->ad_servername != NULL)
	FREE (ad->ad_servername, ad->ad_servernamelen + 1);
      FREE (ad, sizeof (struct ad_private));
    }
  return NULL;
}
INTDEF(authdes_pk_create)

/*
 * Implement the five authentication operations
 */


/*
 * 1. Next Verifier
 */
/*ARGSUSED */
static void
authdes_nextverf (AUTH *auth)
{
  /* what the heck am I supposed to do??? */
}



/*
 * 2. Marshal
 */
static bool_t
authdes_marshal (AUTH *auth, XDR *xdrs)
{
  struct ad_private *ad = AUTH_PRIVATE (auth);
  struct authdes_cred *cred = &ad->ad_cred;
  struct authdes_verf *verf = &ad->ad_verf;
  des_block cryptbuf[2];
  des_block ivec;
  int status;
  int len;
  register int32_t *ixdr;
  struct timeval tval;

  /*
   * Figure out the "time", accounting for any time difference
   * with the server if necessary.
   */
  __gettimeofday (&tval, (struct timezone *) NULL);
  ad->ad_timestamp.tv_sec = tval.tv_sec + ad->ad_timediff.tv_sec;
  ad->ad_timestamp.tv_usec = tval.tv_usec + ad->ad_timediff.tv_usec;
  if (ad->ad_timestamp.tv_usec >= MILLION)
    {
      ad->ad_timestamp.tv_usec -= MILLION;
      ad->ad_timestamp.tv_sec += 1;
    }

  /*
   * XDR the timestamp and possibly some other things, then
   * encrypt them.
   * XXX We have a real Year 2038 problem here.
   */
  ixdr = (int32_t *) cryptbuf;
  IXDR_PUT_INT32 (ixdr, ad->ad_timestamp.tv_sec);
  IXDR_PUT_INT32 (ixdr, ad->ad_timestamp.tv_usec);
  if (ad->ad_cred.adc_namekind == ADN_FULLNAME)
    {
      IXDR_PUT_U_INT32 (ixdr, ad->ad_window);
      IXDR_PUT_U_INT32 (ixdr, ad->ad_window - 1);
      ivec.key.high = ivec.key.low = 0;
      status = cbc_crypt ((char *) &auth->ah_key, (char *) cryptbuf,
	      2 * sizeof (des_block), DES_ENCRYPT | DES_HW, (char *) &ivec);
    }
  else
    status = ecb_crypt ((char *) &auth->ah_key, (char *) cryptbuf,
			sizeof (des_block), DES_ENCRYPT | DES_HW);

  if (DES_FAILED (status))
    {
      debug ("authdes_marshal: DES encryption failure");
      return FALSE;
    }
  ad->ad_verf.adv_xtimestamp = cryptbuf[0];
  if (ad->ad_cred.adc_namekind == ADN_FULLNAME)
    {
      ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
      ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
    }
  else
    {
      ad->ad_cred.adc_nickname = ad->ad_nickname;
      ad->ad_verf.adv_winverf = 0;
    }

  /*
   * Serialize the credential and verifier into opaque
   * authentication data.
   */
  if (ad->ad_cred.adc_namekind == ADN_FULLNAME)
    len = ((1 + 1 + 2 + 1) * BYTES_PER_XDR_UNIT + ad->ad_fullnamelen);
  else
    len = (1 + 1) * BYTES_PER_XDR_UNIT;

  if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL)
    {
      IXDR_PUT_INT32 (ixdr, AUTH_DES);
      IXDR_PUT_U_INT32 (ixdr, len);
    }
  else
    {
      ATTEMPT (xdr_putint32 (xdrs, &auth->ah_cred.oa_flavor));
      ATTEMPT (xdr_putint32 (xdrs, &len));
    }
  ATTEMPT (INTUSE(xdr_authdes_cred) (xdrs, cred));

  len = (2 + 1) * BYTES_PER_XDR_UNIT;
  if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL)
    {
      IXDR_PUT_INT32 (ixdr, AUTH_DES);
      IXDR_PUT_U_INT32 (ixdr, len);
    }
  else
    {
      ATTEMPT (xdr_putint32 (xdrs, &auth->ah_verf.oa_flavor));
      ATTEMPT (xdr_putint32 (xdrs, &len));
    }
  ATTEMPT (INTUSE(xdr_authdes_verf) (xdrs, verf));

  return TRUE;
}


/*
 * 3. Validate
 */
static bool_t
authdes_validate (AUTH *auth, struct opaque_auth *rverf)
{
  struct ad_private *ad = AUTH_PRIVATE (auth);
  struct authdes_verf verf;
  int status;
  register uint32_t *ixdr;

  if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT)
    return FALSE;

  ixdr = (uint32_t *) rverf->oa_base;
  verf.adv_xtimestamp.key.high = *ixdr++;
  verf.adv_xtimestamp.key.low = *ixdr++;
  verf.adv_int_u = *ixdr++;	/* nickname not XDR'd ! */

  /*
   * Decrypt the timestamp
   */
  status = ecb_crypt ((char *) &auth->ah_key, (char *) &verf.adv_xtimestamp,
		      sizeof (des_block), DES_DECRYPT | DES_HW);

  if (DES_FAILED (status))
    {
      debug ("authdes_validate: DES decryption failure");
      return FALSE;
    }

  /*
   * xdr the decrypted timestamp
   */
  ixdr = (uint32_t *) verf.adv_xtimestamp.c;
  verf.adv_timestamp.tv_sec = IXDR_GET_U_INT32 (ixdr) + 1;
  verf.adv_timestamp.tv_usec = IXDR_GET_U_INT32 (ixdr);

  /*
   * validate
   */
  if (memcmp ((char *) &ad->ad_timestamp, (char *) &verf.adv_timestamp,
	      sizeof (struct rpc_timeval)) != 0)
    {
      debug ("authdes_validate: verifier mismatch\n");
      return FALSE;
    }

  /*
   * We have a nickname now, let's use it
   */
  ad->ad_nickname = verf.adv_nickname;
  ad->ad_cred.adc_namekind = ADN_NICKNAME;
  return TRUE;
}

/*
 * 4. Refresh
 */
static bool_t
authdes_refresh (AUTH *auth)
{
  netobj pkey;
  struct ad_private *ad = AUTH_PRIVATE (auth);
  struct authdes_cred *cred = &ad->ad_cred;

  if (ad->ad_dosync && !synchronize (&ad->ad_syncaddr, &ad->ad_timediff))
    {
      /*
       * Hope the clocks are synced!
       */
      ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0;
      debug ("authdes_refresh: unable to synchronize with server");
    }
  ad->ad_xkey = auth->ah_key;
  pkey.n_bytes = (char *) (ad->ad_pkey);
  pkey.n_len = strlen ((char *) ad->ad_pkey) + 1;
  if (key_encryptsession_pk (ad->ad_servername, &pkey, &ad->ad_xkey) < 0)
    {
      debug ("authdes_create: unable to encrypt conversation key");
      return FALSE;
    }
  cred->adc_fullname.key = ad->ad_xkey;
  cred->adc_namekind = ADN_FULLNAME;
  cred->adc_fullname.name = ad->ad_fullname;
  return TRUE;
}

/*
 * 5. Destroy
 */
static void
authdes_destroy (AUTH *auth)
{
  struct ad_private *ad = AUTH_PRIVATE (auth);

  FREE (ad->ad_fullname, ad->ad_fullnamelen + 1);
  FREE (ad->ad_servername, ad->ad_servernamelen + 1);
  FREE (ad, sizeof (struct ad_private));
  FREE (auth, sizeof (AUTH));
}

/*
 * Synchronize with the server at the given address, that is,
 * adjust timep to reflect the delta between our clocks
 */
static bool_t
internal_function
synchronize (struct sockaddr *syncaddr, struct rpc_timeval *timep)
{
  struct timeval mytime;
  struct rpc_timeval timeout;

  timeout.tv_sec = RTIME_TIMEOUT;
  timeout.tv_usec = 0;
  if (rtime ((struct sockaddr_in *) syncaddr, timep, &timeout) < 0)
    return FALSE;

  __gettimeofday (&mytime, (struct timezone *) NULL);
  timep->tv_sec -= mytime.tv_sec;
  if (mytime.tv_usec > timep->tv_usec)
    {
      timep->tv_sec -= 1;
      timep->tv_usec += MILLION;
    }
  timep->tv_usec -= mytime.tv_usec;
  return TRUE;
}