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[glibc.git] / sunrpc / auth_des.c
blobcd68c22ee921963b92258545eb9b5c800d53697d
1 #if defined(LIBC_SCCS) && !defined(lint)
2 static char sccsid[] = "@(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI";
3 #endif
4 /*
5 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
6 * unrestricted use provided that this legend is included on all tape
7 * media and as a part of the software program in whole or part. Users
8 * may copy or modify Sun RPC without charge, but are not authorized
9 * to license or distribute it to anyone else except as part of a product or
10 * program developed by the user.
12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
16 * Sun RPC is provided with no support and without any obligation on the
17 * part of Sun Microsystems, Inc. to assist in its use, correction,
18 * modification or enhancement.
20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
22 * OR ANY PART THEREOF.
24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
25 * or profits or other special, indirect and consequential damages, even if
26 * Sun has been advised of the possibility of such damages.
28 * Sun Microsystems, Inc.
29 * 2550 Garcia Avenue
30 * Mountain View, California 94043
33 * Copyright (c) 1988 by Sun Microsystems, Inc.
36 * auth_des.c, client-side implementation of DES authentication
39 #include <string.h>
40 #include <rpc/des_crypt.h>
41 #include <rpc/types.h>
42 #include <rpc/auth.h>
43 #include <rpc/auth_des.h>
44 #include <rpc/xdr.h>
45 #include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */
46 #include <sys/socket.h>
48 #define MILLION 1000000L
49 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */
51 #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private
52 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type))
53 #define FREE(ptr, size) mem_free((char *)(ptr), (int) size)
54 #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE)
56 #define debug(msg) /* printf("%s\n", msg) */
58 extern int rtime (struct sockaddr_in *, struct timeval *, struct timeval *);
59 extern bool_t xdr_authdes_cred (XDR *, struct authdes_cred *);
60 extern bool_t xdr_authdes_verf (XDR *, struct authdes_verf *);
63 * DES authenticator operations vector
65 static void authdes_nextverf (AUTH *);
66 static bool_t authdes_marshal (AUTH *, XDR *);
67 static bool_t authdes_validate (AUTH *, struct opaque_auth *);
68 static bool_t authdes_refresh (AUTH *);
69 static void authdes_destroy (AUTH *);
70 static bool_t synchronize (struct sockaddr *, struct timeval *)
71 internal_function;
73 static struct auth_ops authdes_ops =
75 authdes_nextverf,
76 authdes_marshal,
77 authdes_validate,
78 authdes_refresh,
79 authdes_destroy
84 * This struct is pointed to by the ah_private field of an "AUTH *"
86 struct ad_private
88 char *ad_fullname; /* client's full name */
89 u_int ad_fullnamelen; /* length of name, rounded up */
90 char *ad_servername; /* server's full name */
91 u_int ad_servernamelen; /* length of name, rounded up */
92 u_int ad_window; /* client specified window */
93 bool_t ad_dosync; /* synchronize? */
94 struct sockaddr ad_syncaddr; /* remote host to synch with */
95 struct timeval ad_timediff; /* server's time - client's time */
96 u_long ad_nickname; /* server's nickname for client */
97 struct authdes_cred ad_cred; /* storage for credential */
98 struct authdes_verf ad_verf; /* storage for verifier */
99 struct timeval ad_timestamp; /* timestamp sent */
100 des_block ad_xkey; /* encrypted conversation key */
101 u_char ad_pkey[1024]; /* Servers actual public key */
106 * Create the client des authentication object
108 AUTH *
109 authdes_create (const char *servername, u_int window,
110 struct sockaddr *syncaddr, des_block *ckey)
111 /* servername - network name of server */
112 /* window - time to live */
113 /* syncaddr - optional addr of host to sync with */
114 /* ckey - optional conversation key to use */
116 u_char pkey_data[1024];
117 netobj pkey;
119 if (!getpublickey (servername, pkey_data))
120 return (NULL);
122 pkey.n_bytes = (char *) pkey_data;
123 pkey.n_len = strlen ((char *) pkey_data) + 1;
124 return authdes_pk_create (servername, &pkey, window, syncaddr, ckey);
127 AUTH *
128 authdes_pk_create (const char *servername, netobj *pkey, u_int window,
129 struct sockaddr *syncaddr, des_block *ckey)
131 AUTH *auth;
132 struct ad_private *ad;
133 char namebuf[MAXNETNAMELEN + 1];
136 * Allocate everything now
138 auth = ALLOC (AUTH);
139 ad = ALLOC (struct ad_private);
140 memset (ad, 0, sizeof (struct ad_private));
141 memcpy (ad->ad_pkey, pkey->n_bytes, pkey->n_len);
142 if (!getnetname (namebuf))
143 goto failed;
144 ad->ad_fullnamelen = RNDUP (strlen (namebuf));
145 ad->ad_fullname = mem_alloc (ad->ad_fullnamelen + 1);
147 ad->ad_servernamelen = strlen (servername);
148 ad->ad_servername = mem_alloc (ad->ad_servernamelen + 1);
150 if (auth == NULL || ad == NULL || ad->ad_fullname == NULL ||
151 ad->ad_servername == NULL)
153 debug ("authdes_create: out of memory");
154 goto failed;
158 * Set up private data
160 bcopy (namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1);
161 bcopy (servername, ad->ad_servername, ad->ad_servernamelen + 1);
162 ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0;
163 if (syncaddr != NULL)
165 ad->ad_syncaddr = *syncaddr;
166 ad->ad_dosync = TRUE;
168 else
169 ad->ad_dosync = FALSE;
171 ad->ad_window = window;
172 if (ckey == NULL)
174 if (key_gendes (&auth->ah_key) < 0)
176 debug ("authdes_create: unable to gen conversation key");
177 return (NULL);
180 else
181 auth->ah_key = *ckey;
184 * Set up auth handle
186 auth->ah_cred.oa_flavor = AUTH_DES;
187 auth->ah_verf.oa_flavor = AUTH_DES;
188 auth->ah_ops = &authdes_ops;
189 auth->ah_private = (caddr_t) ad;
191 if (!authdes_refresh (auth))
192 goto failed;
194 return (auth);
196 failed:
197 if (auth != NULL)
198 FREE (auth, sizeof (AUTH));
199 if (ad != NULL)
201 if (ad->ad_fullname != NULL)
202 FREE (ad->ad_fullname, ad->ad_fullnamelen + 1);
203 if (ad->ad_servername != NULL)
204 FREE (ad->ad_servername, ad->ad_servernamelen + 1);
205 FREE (ad, sizeof (struct ad_private));
207 return (NULL);
211 * Implement the five authentication operations
216 * 1. Next Verifier
218 /*ARGSUSED */
219 static void
220 authdes_nextverf (AUTH * auth)
222 /* what the heck am I supposed to do??? */
228 * 2. Marshal
230 static bool_t
231 authdes_marshal (AUTH * auth, XDR * xdrs)
233 struct ad_private *ad = AUTH_PRIVATE (auth);
234 struct authdes_cred *cred = &ad->ad_cred;
235 struct authdes_verf *verf = &ad->ad_verf;
236 des_block cryptbuf[2];
237 des_block ivec;
238 int status;
239 int len;
240 register long *ixdr;
243 * Figure out the "time", accounting for any time difference
244 * with the server if necessary.
246 __gettimeofday (&ad->ad_timestamp, (struct timezone *) NULL);
247 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
248 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
249 if (ad->ad_timestamp.tv_usec >= MILLION)
251 ad->ad_timestamp.tv_usec -= MILLION;
252 ad->ad_timestamp.tv_sec += 1;
256 * XDR the timestamp and possibly some other things, then
257 * encrypt them.
259 ixdr = (long *) cryptbuf;
260 IXDR_PUT_LONG (ixdr, ad->ad_timestamp.tv_sec);
261 IXDR_PUT_LONG (ixdr, ad->ad_timestamp.tv_usec);
262 if (ad->ad_cred.adc_namekind == ADN_FULLNAME)
264 IXDR_PUT_U_LONG (ixdr, ad->ad_window);
265 IXDR_PUT_U_LONG (ixdr, ad->ad_window - 1);
266 ivec.key.high = ivec.key.low = 0;
267 status = cbc_crypt ((char *) &auth->ah_key, (char *) cryptbuf,
268 2 * sizeof (des_block), DES_ENCRYPT | DES_HW, (char *) &ivec);
270 else
272 status = ecb_crypt ((char *) &auth->ah_key, (char *) cryptbuf,
273 sizeof (des_block), DES_ENCRYPT | DES_HW);
275 if (DES_FAILED (status))
277 debug ("authdes_marshal: DES encryption failure");
278 return (FALSE);
280 ad->ad_verf.adv_xtimestamp = cryptbuf[0];
281 if (ad->ad_cred.adc_namekind == ADN_FULLNAME)
283 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
284 ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
286 else
288 ad->ad_cred.adc_nickname = ad->ad_nickname;
289 ad->ad_verf.adv_winverf = 0;
293 * Serialize the credential and verifier into opaque
294 * authentication data.
296 if (ad->ad_cred.adc_namekind == ADN_FULLNAME)
298 len = ((1 + 1 + 2 + 1) * BYTES_PER_XDR_UNIT + ad->ad_fullnamelen);
300 else
302 len = (1 + 1) * BYTES_PER_XDR_UNIT;
305 if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL)
307 IXDR_PUT_LONG (ixdr, AUTH_DES);
308 IXDR_PUT_LONG (ixdr, len);
310 else
312 ATTEMPT (xdr_putlong (xdrs, (long *)&auth->ah_cred.oa_flavor));
313 ATTEMPT (xdr_putlong (xdrs, (long *)&len));
315 ATTEMPT (xdr_authdes_cred (xdrs, cred));
317 len = (2 + 1) * BYTES_PER_XDR_UNIT;
318 if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL)
320 IXDR_PUT_LONG (ixdr, AUTH_DES);
321 IXDR_PUT_LONG (ixdr, len);
323 else
325 ATTEMPT (xdr_putlong (xdrs, (long *)&auth->ah_verf.oa_flavor));
326 ATTEMPT (xdr_putlong (xdrs, (long *)&len));
328 ATTEMPT (xdr_authdes_verf (xdrs, verf));
329 return (TRUE);
334 * 3. Validate
336 static bool_t
337 authdes_validate (AUTH * auth, struct opaque_auth *rverf)
339 struct ad_private *ad = AUTH_PRIVATE (auth);
340 struct authdes_verf verf;
341 int status;
342 register u_long *ixdr;
344 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT)
345 return (FALSE);
347 ixdr = (u_long *) rverf->oa_base;
348 verf.adv_xtimestamp.key.high = (u_long) * ixdr++;
349 verf.adv_xtimestamp.key.low = (u_long) * ixdr++;
350 verf.adv_int_u = (u_long) * ixdr++; /* nickname not XDR'd ! */
353 * Decrypt the timestamp
355 status = ecb_crypt ((char *) &auth->ah_key, (char *) &verf.adv_xtimestamp,
356 sizeof (des_block), DES_DECRYPT | DES_HW);
358 if (DES_FAILED (status))
360 debug ("authdes_validate: DES decryption failure");
361 return (FALSE);
365 * xdr the decrypted timestamp
367 ixdr = (u_long *) verf.adv_xtimestamp.c;
368 verf.adv_timestamp.tv_sec = IXDR_GET_LONG (ixdr) + 1;
369 verf.adv_timestamp.tv_usec = IXDR_GET_LONG (ixdr);
372 * validate
374 if (memcmp ((char *) &ad->ad_timestamp, (char *) &verf.adv_timestamp,
375 sizeof (struct timeval)) != 0)
377 debug ("authdes_validate: verifier mismatch\n");
378 return (FALSE);
382 * We have a nickname now, let's use it
384 ad->ad_nickname = verf.adv_nickname;
385 ad->ad_cred.adc_namekind = ADN_NICKNAME;
386 return (TRUE);
390 * 4. Refresh
392 static bool_t
393 authdes_refresh (AUTH * auth)
395 netobj pkey;
396 struct ad_private *ad = AUTH_PRIVATE (auth);
397 struct authdes_cred *cred = &ad->ad_cred;
399 if (ad->ad_dosync &&
400 !synchronize (&ad->ad_syncaddr, &ad->ad_timediff))
403 * Hope the clocks are synced!
405 ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0;
406 debug ("authdes_refresh: unable to synchronize with server");
408 ad->ad_xkey = auth->ah_key;
409 pkey.n_bytes = (char *) (ad->ad_pkey);
410 pkey.n_len = strlen ((char *) ad->ad_pkey) + 1;
411 if (key_encryptsession_pk (ad->ad_servername, &pkey, &ad->ad_xkey) < 0)
413 debug ("authdes_create: unable to encrypt conversation key");
414 return (FALSE);
416 cred->adc_fullname.key = ad->ad_xkey;
417 cred->adc_namekind = ADN_FULLNAME;
418 cred->adc_fullname.name = ad->ad_fullname;
419 return (TRUE);
423 * 5. Destroy
425 static void
426 authdes_destroy (AUTH * auth)
428 struct ad_private *ad = AUTH_PRIVATE (auth);
430 FREE (ad->ad_fullname, ad->ad_fullnamelen + 1);
431 FREE (ad->ad_servername, ad->ad_servernamelen + 1);
432 FREE (ad, sizeof (struct ad_private));
433 FREE (auth, sizeof (AUTH));
437 * Synchronize with the server at the given address, that is,
438 * adjust timep to reflect the delta between our clocks
440 static bool_t
441 internal_function
442 synchronize (struct sockaddr *syncaddr, struct timeval *timep)
444 struct timeval mytime;
445 struct timeval timeout;
447 timeout.tv_sec = RTIME_TIMEOUT;
448 timeout.tv_usec = 0;
449 if (rtime ((struct sockaddr_in *) syncaddr, timep, &timeout) < 0)
450 return (FALSE);
452 __gettimeofday (&mytime, (struct timezone *) NULL);
453 timep->tv_sec -= mytime.tv_sec;
454 if (mytime.tv_usec > timep->tv_usec)
456 timep->tv_sec -= 1;
457 timep->tv_usec += MILLION;
459 timep->tv_usec -= mytime.tv_usec;
460 return (TRUE);