source: rtems/c/src/exec/librpc/src/rpc/auth_des.c @ df49c60

4.104.114.84.95
Last change on this file since df49c60 was df49c60, checked in by Joel Sherrill <joel.sherrill@…>, on 06/12/00 at 15:00:15

Merged from 4.5.0-beta3a

  • Property mode set to 100644
File size: 15.0 KB
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1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California  94043
28 */
29/*
30 * Copyright (c) 1988 by Sun Microsystems, Inc.
31 */
32/*
33 * auth_des.c, client-side implementation of DES authentication
34 */
35#include <string.h>
36#include <stdlib.h>
37#include <unistd.h>
38#include <sys/cdefs.h>
39#include <rpc/des_crypt.h>
40#include <rpc/types.h>
41#include <rpc/xdr.h>
42#include <rpc/auth.h>
43#include <rpc/auth_des.h>
44#include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */
45#include <sys/socket.h>
46#undef NIS
47#include <rpcsvc/nis.h>
48
49#if defined(LIBC_SCCS) && !defined(lint)
50/* from: static char sccsid[] =         "@(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI"; */
51static const char rcsid[] = "$FreeBSD: src/lib/libc/rpc/auth_des.c,v 1.3 1999/08/28 00:00:32 peter Exp $";
52#endif
53
54extern bool_t __rpc_get_time_offset __P(( struct timeval *, nis_server *,
55                                                char *, char **, struct sockaddr_in * ));
56extern int rtime __P(( struct sockaddr_in *, struct timeval *, struct timeval *));
57extern bool_t xdr_authdes_cred __P(( XDR *, struct authdes_cred * ));
58extern bool_t xdr_authdes_verf __P(( XDR *, struct authdes_verf * ));
59
60#define MILLION         1000000L
61#define RTIME_TIMEOUT 5         /* seconds to wait for sync */
62
63#define AUTH_PRIVATE(auth)      (struct ad_private *) auth->ah_private
64#define ALLOC(object_type)      (object_type *) mem_alloc(sizeof(object_type))
65#define FREE(ptr, size)         mem_free((char *)(ptr), (int) size)
66#define ATTEMPT(xdr_op)         if (!(xdr_op)) return (FALSE)
67
68#define debug(msg)               /*printf("%s\n", msg) */
69
70/*
71 * DES authenticator operations vector
72 */
73static void     authdes_nextverf();
74static bool_t   authdes_marshal();
75static bool_t   authdes_validate();
76static bool_t   authdes_refresh();
77static void     authdes_destroy();
78static struct auth_ops authdes_ops = {
79        authdes_nextverf,
80        authdes_marshal,
81        authdes_validate,
82        authdes_refresh,
83        authdes_destroy
84};
85#ifdef foo
86static bool_t   synchronize __P(( struct sockaddr *, struct timeval *));
87#endif
88/*
89 * This struct is pointed to by the ah_private field of an "AUTH *"
90 */
91struct ad_private {
92        char *ad_fullname;              /* client's full name */
93        u_int ad_fullnamelen;           /* length of name, rounded up */
94        char *ad_servername;            /* server's full name */
95        u_int ad_servernamelen;         /* length of name, rounded up */
96        u_int ad_window;                /* client specified window */
97        bool_t ad_dosync;               /* synchronize? */             
98        struct sockaddr ad_syncaddr;    /* remote host to synch with */
99        char *ad_timehost;              /* remote host to synch with */
100        struct timeval ad_timediff;     /* server's time - client's time */
101        u_long ad_nickname;             /* server's nickname for client */
102        struct authdes_cred ad_cred;    /* storage for credential */
103        struct authdes_verf ad_verf;    /* storage for verifier */
104        struct timeval ad_timestamp;    /* timestamp sent */
105        des_block ad_xkey;              /* encrypted conversation key */
106        u_char ad_pkey[1024];           /* Server's actual public key */
107        char *ad_netid;                 /* Timehost netid */
108        char *ad_uaddr;                 /* Timehost uaddr */
109        nis_server *ad_nis_srvr;        /* NIS+ server struct */
110};
111       
112
113/*
114 * Create the client des authentication object
115 */     
116AUTH *
117authdes_create(servername, window, syncaddr, ckey)
118        char *servername;               /* network name of server */
119        u_int window;                   /* time to live */
120        struct sockaddr *syncaddr;      /* optional addr of host to sync with */
121        des_block *ckey;                /* optional conversation key to use*/
122{
123
124        AUTH *auth;
125        struct ad_private *ad;
126        char namebuf[MAXNETNAMELEN+1];
127        u_char  pkey_data[1024];
128
129        if (!getpublickey(servername, pkey_data))
130                return(NULL);
131
132        /*
133         * Allocate everything now
134         */
135        auth = ALLOC(AUTH);
136        ad = ALLOC(struct ad_private);
137        (void) getnetname(namebuf);
138
139        ad->ad_fullnamelen = RNDUP(strlen(namebuf));
140        ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
141
142        ad->ad_servernamelen = strlen(servername);
143        ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
144
145        if (auth == NULL || ad == NULL || ad->ad_fullname == NULL ||
146            ad->ad_servername == NULL) {
147                debug("authdes_create: out of memory");
148                goto failed;
149        }
150
151        /*
152         * Set up private data
153         */
154        bcopy(namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1);
155        bcopy(servername, ad->ad_servername, ad->ad_servernamelen + 1);
156        bcopy(pkey_data, ad->ad_pkey, strlen(pkey_data) + 1);
157        if (syncaddr != NULL) {
158                ad->ad_syncaddr = *syncaddr;
159                ad->ad_dosync = TRUE;
160        } else {
161                ad->ad_dosync = FALSE;
162        }
163        ad->ad_window = window;
164        if (ckey == NULL) {
165                if (key_gendes(&auth->ah_key) < 0) {
166                        debug("authdes_create: unable to gen conversation key");
167                        return (NULL);
168                }
169        } else {
170                auth->ah_key = *ckey;
171        }
172
173        /*
174         * Set up auth handle
175         */
176        auth->ah_cred.oa_flavor = AUTH_DES;
177        auth->ah_verf.oa_flavor = AUTH_DES;
178        auth->ah_ops = &authdes_ops;
179        auth->ah_private = (caddr_t)ad;
180
181        if (!authdes_refresh(auth)) {
182                goto failed;
183        }       
184        return (auth);
185
186failed:
187        if (auth != NULL)
188                FREE(auth, sizeof(AUTH));
189        if (ad != NULL)
190                FREE(ad, sizeof(struct ad_private));
191        if (ad->ad_fullname != NULL)
192                FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
193        if (ad->ad_servername != NULL)
194                FREE(ad->ad_servername, ad->ad_servernamelen + 1);
195        return (NULL);
196}
197
198/*
199 * Slightly modified version of authdes_create which takes the public key
200 * of the server principal as an argument. This spares us a call to
201 * getpublickey() which in the nameserver context can cause a deadlock.
202 */
203AUTH *
204authdes_pk_create(servername, pkey, window, timehost, ckey, srvr)
205        char *servername;               /* network name of server */
206        netobj *pkey;                   /* public key of server */
207        u_int window;                   /* time to live */
208        char *timehost;                 /* optional hostname to sync with */
209        des_block *ckey;                /* optional conversation key to use */
210        nis_server *srvr;               /* optional NIS+ server struct */
211{
212        AUTH *auth;
213        struct ad_private *ad;
214        char namebuf[MAXNETNAMELEN+1];
215
216        /*
217         * Allocate everything now
218         */
219        auth = ALLOC(AUTH);
220        if (auth == NULL) {
221                debug("authdes_pk_create: out of memory");
222                return (NULL);
223        }
224        ad = ALLOC(struct ad_private);
225        if (ad == NULL) {
226                debug("authdes_pk_create: out of memory");
227                goto failed;
228        }
229        ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */
230        ad->ad_timehost = NULL;
231        ad->ad_netid = NULL;
232        ad->ad_uaddr = NULL;
233        ad->ad_nis_srvr = NULL;
234        ad->ad_timediff.tv_sec = 0;
235        ad->ad_timediff.tv_usec = 0;
236        memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
237        if (!getnetname(namebuf))
238                goto failed;
239        ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf));
240        ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
241        ad->ad_servernamelen = strlen(servername);
242        ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
243
244        if (ad->ad_fullname == NULL || ad->ad_servername == NULL) {
245                debug("authdes_pk_create: out of memory");
246                goto failed;
247        }
248        if (timehost != NULL) {
249                ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
250                if (ad->ad_timehost == NULL) {
251                        debug("authdes_pk_create: out of memory");
252                        goto failed;
253                }
254                memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1);
255                ad->ad_dosync = TRUE;
256        } else if (srvr != NULL) {
257                ad->ad_nis_srvr = srvr; /* transient */
258                ad->ad_dosync = TRUE;
259        } else {
260                ad->ad_dosync = FALSE;
261        }
262        memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
263        memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1);
264        ad->ad_window = window;
265        if (ckey == NULL) {
266                if (key_gendes(&auth->ah_key) < 0) {
267                        debug("authdes_pk_create: unable to gen conversation key");
268                        goto failed;
269                }
270        } else {
271                auth->ah_key = *ckey;
272        }
273
274        /*
275         * Set up auth handle
276         */
277        auth->ah_cred.oa_flavor = AUTH_DES;
278        auth->ah_verf.oa_flavor = AUTH_DES;
279        auth->ah_ops = &authdes_ops;
280        auth->ah_private = (caddr_t)ad;
281
282        if (!authdes_refresh(auth)) {
283                goto failed;
284        }
285        ad->ad_nis_srvr = NULL; /* not needed any longer */
286        return (auth);
287
288failed:
289        if (auth)
290                FREE(auth, sizeof (AUTH));
291        if (ad) {
292                if (ad->ad_fullname)
293                        FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
294                if (ad->ad_servername)
295                        FREE(ad->ad_servername, ad->ad_servernamelen + 1);
296                if (ad->ad_timehost)
297                        FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
298                if (ad->ad_netid)
299                        free(ad->ad_netid);
300                if (ad->ad_uaddr)
301                        free(ad->ad_uaddr);
302                FREE(ad, sizeof (struct ad_private));
303        }
304        return (NULL);
305}
306/*
307 * Implement the five authentication operations
308 */
309
310
311/*
312 * 1. Next Verifier
313 */     
314/*ARGSUSED*/
315static void
316authdes_nextverf(auth)
317        AUTH *auth;
318{
319        /* what the heck am I supposed to do??? */
320}
321               
322
323
324/*
325 * 2. Marshal
326 */
327static bool_t
328authdes_marshal(auth, xdrs)
329        AUTH *auth;
330        XDR *xdrs;
331{
332        struct ad_private *ad = AUTH_PRIVATE(auth);
333        struct authdes_cred *cred = &ad->ad_cred;
334        struct authdes_verf *verf = &ad->ad_verf;
335        des_block cryptbuf[2]; 
336        des_block ivec;
337        int status;
338        long len;
339        int32_t *ixdr;
340
341        /*
342         * Figure out the "time", accounting for any time difference
343         * with the server if necessary.
344         */
345        (void) gettimeofday(&ad->ad_timestamp, (struct timezone *)NULL);
346        ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
347        ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
348        if (ad->ad_timestamp.tv_usec >= MILLION) {
349                ad->ad_timestamp.tv_usec -= MILLION;
350                ad->ad_timestamp.tv_sec += 1;
351        }
352
353        /*
354         * XDR the timestamp and possibly some other things, then
355         * encrypt them.
356         */
357        ixdr = (int32_t *)cryptbuf;
358        IXDR_PUT_LONG(ixdr, ad->ad_timestamp.tv_sec);
359        IXDR_PUT_LONG(ixdr, ad->ad_timestamp.tv_usec);
360        if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
361                IXDR_PUT_U_LONG(ixdr, ad->ad_window);
362                IXDR_PUT_U_LONG(ixdr, ad->ad_window - 1);
363                ivec.key.high = ivec.key.low = 0;       
364                status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
365                        2*sizeof(des_block), DES_ENCRYPT | DES_HW, (char *)&ivec);
366        } else {
367                status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
368                        sizeof(des_block), DES_ENCRYPT | DES_HW);
369        }
370        if (DES_FAILED(status)) {
371                debug("authdes_marshal: DES encryption failure");
372                return (FALSE);
373        }
374        ad->ad_verf.adv_xtimestamp = cryptbuf[0];
375        if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
376                ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
377                ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
378        } else {
379                ad->ad_cred.adc_nickname = ad->ad_nickname;
380                ad->ad_verf.adv_winverf = 0;
381        }
382
383        /*
384         * Serialize the credential and verifier into opaque
385         * authentication data.
386         */
387        if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
388                len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen);
389        } else {
390                len = (1 + 1)*BYTES_PER_XDR_UNIT;
391        }
392
393        if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
394                IXDR_PUT_LONG(ixdr, AUTH_DES);
395                IXDR_PUT_LONG(ixdr, len);
396        } else {
397                ATTEMPT(xdr_putlong(xdrs, (long *)&auth->ah_cred.oa_flavor));
398                ATTEMPT(xdr_putlong(xdrs, &len));
399        }
400        ATTEMPT(xdr_authdes_cred(xdrs, cred));
401
402        len = (2 + 1)*BYTES_PER_XDR_UNIT;
403        if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
404                IXDR_PUT_LONG(ixdr, AUTH_DES);
405                IXDR_PUT_LONG(ixdr, len);
406        } else {
407                ATTEMPT(xdr_putlong(xdrs, (long *)&auth->ah_verf.oa_flavor));
408                ATTEMPT(xdr_putlong(xdrs, &len));
409        }
410        ATTEMPT(xdr_authdes_verf(xdrs, verf));
411        return (TRUE);
412}
413
414
415/*
416 * 3. Validate
417 */
418static bool_t
419authdes_validate(auth, rverf)
420        AUTH *auth;
421        struct opaque_auth *rverf;
422{
423        struct ad_private *ad = AUTH_PRIVATE(auth);
424        struct authdes_verf verf;
425        int status;
426        register u_long *ixdr;
427
428        if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) {
429                return (FALSE);
430        }
431        ixdr = (u_long *)rverf->oa_base;
432        verf.adv_xtimestamp.key.high = (u_long)*ixdr++;
433        verf.adv_xtimestamp.key.low = (u_long)*ixdr++;
434        verf.adv_int_u = (u_long)*ixdr++;       /* nickname not XDR'd ! */
435
436        /*
437         * Decrypt the timestamp
438         */
439        status = ecb_crypt((char *)&auth->ah_key, (char *)&verf.adv_xtimestamp,
440                sizeof(des_block), DES_DECRYPT | DES_HW);
441
442        if (DES_FAILED(status)) {
443                debug("authdes_validate: DES decryption failure");
444                return (FALSE);
445        }
446
447        /*
448         * xdr the decrypted timestamp
449         */
450        ixdr = (u_long *)verf.adv_xtimestamp.c;
451        verf.adv_timestamp.tv_sec = IXDR_GET_LONG(ixdr) + 1;
452        verf.adv_timestamp.tv_usec = IXDR_GET_LONG(ixdr);
453
454        /*
455         * validate
456         */
457        if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
458                 sizeof(struct timeval)) != 0) {
459                debug("authdes_validate: verifier mismatch\n");
460                return (FALSE);
461        }
462
463        /*
464         * We have a nickname now, let's use it
465         */
466        ad->ad_nickname = verf.adv_nickname;   
467        ad->ad_cred.adc_namekind = ADN_NICKNAME;
468        return (TRUE); 
469}
470
471/*
472 * 4. Refresh
473 */
474static bool_t
475authdes_refresh(auth)
476        AUTH *auth;
477{
478        struct ad_private *ad = AUTH_PRIVATE(auth);
479        struct authdes_cred *cred = &ad->ad_cred;
480        netobj          pkey;
481
482        if (ad->ad_dosync &&
483#ifdef old
484                        !synchronize(&ad->ad_syncaddr, &ad->ad_timediff)) {
485#else
486                        !__rpc_get_time_offset(&ad->ad_timediff,ad->ad_nis_srvr,
487                                               ad->ad_timehost, &(ad->ad_uaddr),
488                                (struct sockaddr_in *)&(ad->ad_syncaddr))) {
489#endif
490                /*
491                 * Hope the clocks are synced!
492                 */
493                ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0;
494                ad->ad_dosync = 0;
495                debug("authdes_refresh: unable to synchronize with server");
496        }
497        ad->ad_xkey = auth->ah_key;
498        pkey.n_bytes = (char *)(ad->ad_pkey);
499        pkey.n_len = strlen((char *)ad->ad_pkey) + 1;
500        if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) {
501                debug("authdes_create: unable to encrypt conversation key");
502                return (FALSE);
503        }
504        cred->adc_fullname.key = ad->ad_xkey;
505        cred->adc_namekind = ADN_FULLNAME;
506        cred->adc_fullname.name = ad->ad_fullname;
507        return (TRUE);
508}
509
510
511/*
512 * 5. Destroy
513 */
514static void
515authdes_destroy(auth)
516        AUTH *auth;
517{
518        struct ad_private *ad = AUTH_PRIVATE(auth);
519
520        FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
521        FREE(ad->ad_servername, ad->ad_servernamelen + 1);
522        FREE(ad, sizeof(struct ad_private));
523        FREE(auth, sizeof(AUTH));
524}
525       
526
527#ifdef old
528/*
529 * Synchronize with the server at the given address, that is,
530 * adjust timep to reflect the delta between our clocks
531 */
532static bool_t
533synchronize(syncaddr, timep)
534        struct sockaddr *syncaddr;
535        struct timeval *timep;
536{
537        struct timeval mytime;
538        struct timeval timeout;
539
540        timeout.tv_sec = RTIME_TIMEOUT;
541        timeout.tv_usec = 0;
542        if (rtime((struct sockaddr_in *)syncaddr, timep, NULL /*&timeout*/) < 0) {
543                return (FALSE);
544        }
545        (void) gettimeofday(&mytime, (struct timezone *)NULL);
546        timep->tv_sec -= mytime.tv_sec;
547        if (mytime.tv_usec > timep->tv_usec) {
548                timep->tv_sec -= 1;
549                timep->tv_usec += MILLION;
550        }
551        timep->tv_usec -= mytime.tv_usec;
552        return (TRUE);
553}
554#endif
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