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30 * Copyright (c) 1988 by Sun Microsystems, Inc.
33 * auth_des.c, client-side implementation of DES authentication
36 #include "namespace.h"
37 #include "reentrant.h"
43 #include <sys/cdefs.h>
44 #include <rpc/des_crypt.h>
46 #include <rpc/types.h>
48 #include <rpc/auth_des.h>
51 #include <sys/socket.h>
53 #include <rpcsvc/nis.h>
54 #include "un-namespace.h"
56 #if defined(LIBC_SCCS) && !defined(lint)
57 /* from: static char sccsid[] = "@(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI"; */
59 #include <sys/cdefs.h>
60 __FBSDID("$FreeBSD$");
62 #define USEC_PER_SEC 1000000
63 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */
65 #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private
66 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type))
67 #define FREE(ptr, size) mem_free((char *)(ptr), (int) size)
68 #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE)
70 extern bool_t xdr_authdes_cred( XDR *, struct authdes_cred *);
71 extern bool_t xdr_authdes_verf( XDR *, struct authdes_verf *);
72 extern int key_encryptsession_pk();
74 extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *,
78 * DES authenticator operations vector
80 static void authdes_nextverf(AUTH *);
81 static bool_t authdes_marshal(AUTH *, XDR *);
82 static bool_t authdes_validate(AUTH *, struct opaque_auth *);
83 static bool_t authdes_refresh(AUTH *, void *);
84 static void authdes_destroy(AUTH *);
86 static struct auth_ops *authdes_ops(void);
89 * This struct is pointed to by the ah_private field of an "AUTH *"
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 netbuf 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_int 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 */
112 AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *,
113 const des_block *, nis_server *);
116 * documented version of authdes_seccreate
119 servername: network name of server
121 timehost: optional hostname to sync with
122 ckey: optional conversation key to use
126 authdes_seccreate(const char *servername, const u_int win,
127 const char *timehost, const des_block *ckey)
129 u_char pkey_data[1024];
133 if (! getpublickey(servername, (char *) pkey_data)) {
135 "authdes_seccreate: no public key found for %s",
140 pkey.n_bytes = (char *) pkey_data;
141 pkey.n_len = (u_int)strlen((char *)pkey_data) + 1;
142 dummy = authdes_pk_seccreate(servername, &pkey, win, timehost,
148 * Slightly modified version of authdessec_create which takes the public key
149 * of the server principal as an argument. This spares us a call to
150 * getpublickey() which in the nameserver context can cause a deadlock.
153 authdes_pk_seccreate(const char *servername, netobj *pkey, u_int window,
154 const char *timehost, const des_block *ckey, nis_server *srvr)
157 struct ad_private *ad;
158 char namebuf[MAXNETNAMELEN+1];
161 * Allocate everything now
165 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
168 ad = ALLOC(struct ad_private);
170 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
173 ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */
174 ad->ad_timehost = NULL;
177 ad->ad_nis_srvr = NULL;
178 ad->ad_timediff.tv_sec = 0;
179 ad->ad_timediff.tv_usec = 0;
180 memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
181 if (!getnetname(namebuf))
183 ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf));
184 ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
185 ad->ad_servernamelen = strlen(servername);
186 ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
188 if (ad->ad_fullname == NULL || ad->ad_servername == NULL) {
189 syslog(LOG_ERR, "authdes_seccreate: out of memory");
192 if (timehost != NULL) {
193 ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
194 if (ad->ad_timehost == NULL) {
195 syslog(LOG_ERR, "authdes_seccreate: out of memory");
198 memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1);
199 ad->ad_dosync = TRUE;
200 } else if (srvr != NULL) {
201 ad->ad_nis_srvr = srvr; /* transient */
202 ad->ad_dosync = TRUE;
204 ad->ad_dosync = FALSE;
206 memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
207 memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1);
208 ad->ad_window = window;
210 if (key_gendes(&auth->ah_key) < 0) {
212 "authdes_seccreate: keyserv(1m) is unable to generate session key");
216 auth->ah_key = *ckey;
222 auth->ah_cred.oa_flavor = AUTH_DES;
223 auth->ah_verf.oa_flavor = AUTH_DES;
224 auth->ah_ops = authdes_ops();
225 auth->ah_private = (caddr_t)ad;
227 if (!authdes_refresh(auth, NULL)) {
230 ad->ad_nis_srvr = NULL; /* not needed any longer */
235 FREE(auth, sizeof (AUTH));
238 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
239 if (ad->ad_servername)
240 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
242 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
244 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
246 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
247 FREE(ad, sizeof (struct ad_private));
253 * Implement the five authentication operations
262 authdes_nextverf(AUTH *auth)
264 /* what the heck am I supposed to do??? */
272 authdes_marshal(AUTH *auth, XDR *xdrs)
274 /* LINTED pointer alignment */
275 struct ad_private *ad = AUTH_PRIVATE(auth);
276 struct authdes_cred *cred = &ad->ad_cred;
277 struct authdes_verf *verf = &ad->ad_verf;
278 des_block cryptbuf[2];
285 * Figure out the "time", accounting for any time difference
286 * with the server if necessary.
288 (void) gettimeofday(&ad->ad_timestamp, (struct timezone *)NULL);
289 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
290 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
291 while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) {
292 ad->ad_timestamp.tv_usec -= USEC_PER_SEC;
293 ad->ad_timestamp.tv_sec++;
297 * XDR the timestamp and possibly some other things, then
300 ixdr = (rpc_inline_t *)cryptbuf;
301 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec);
302 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec);
303 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
304 IXDR_PUT_U_INT32(ixdr, ad->ad_window);
305 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1);
306 ivec.key.high = ivec.key.low = 0;
307 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
308 (u_int) 2 * sizeof (des_block),
309 DES_ENCRYPT | DES_HW, (char *)&ivec);
311 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
312 (u_int) sizeof (des_block),
313 DES_ENCRYPT | DES_HW);
315 if (DES_FAILED(status)) {
316 syslog(LOG_ERR, "authdes_marshal: DES encryption failure");
319 ad->ad_verf.adv_xtimestamp = cryptbuf[0];
320 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
321 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
322 ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
324 ad->ad_cred.adc_nickname = ad->ad_nickname;
325 ad->ad_verf.adv_winverf = 0;
329 * Serialize the credential and verifier into opaque
330 * authentication data.
332 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
333 len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen);
335 len = (1 + 1)*BYTES_PER_XDR_UNIT;
338 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
339 IXDR_PUT_INT32(ixdr, AUTH_DES);
340 IXDR_PUT_INT32(ixdr, len);
342 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor));
343 ATTEMPT(xdr_putint32(xdrs, &len));
345 ATTEMPT(xdr_authdes_cred(xdrs, cred));
347 len = (2 + 1)*BYTES_PER_XDR_UNIT;
348 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
349 IXDR_PUT_INT32(ixdr, AUTH_DES);
350 IXDR_PUT_INT32(ixdr, len);
352 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor));
353 ATTEMPT(xdr_putint32(xdrs, &len));
355 ATTEMPT(xdr_authdes_verf(xdrs, verf));
364 authdes_validate(AUTH *auth, struct opaque_auth *rverf)
366 /* LINTED pointer alignment */
367 struct ad_private *ad = AUTH_PRIVATE(auth);
368 struct authdes_verf verf;
373 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) {
376 /* LINTED pointer alignment */
377 ixdr = (uint32_t *)rverf->oa_base;
378 buf.key.high = (uint32_t)*ixdr++;
379 buf.key.low = (uint32_t)*ixdr++;
380 verf.adv_int_u = (uint32_t)*ixdr++;
383 * Decrypt the timestamp
385 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf,
386 (u_int)sizeof (des_block), DES_DECRYPT | DES_HW);
388 if (DES_FAILED(status)) {
389 syslog(LOG_ERR, "authdes_validate: DES decryption failure");
394 * xdr the decrypted timestamp
396 /* LINTED pointer alignment */
397 ixdr = (uint32_t *)buf.c;
398 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1;
399 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr);
404 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
405 sizeof(struct timeval)) != 0) {
406 syslog(LOG_DEBUG, "authdes_validate: verifier mismatch");
411 * We have a nickname now, let's use it
413 ad->ad_nickname = verf.adv_nickname;
414 ad->ad_cred.adc_namekind = ADN_NICKNAME;
423 authdes_refresh(AUTH *auth, void *dummy)
425 /* LINTED pointer alignment */
426 struct ad_private *ad = AUTH_PRIVATE(auth);
427 struct authdes_cred *cred = &ad->ad_cred;
432 ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr,
433 ad->ad_timehost, &(ad->ad_uaddr),
437 * Hope the clocks are synced!
441 "authdes_refresh: unable to synchronize clock");
444 ad->ad_xkey = auth->ah_key;
445 pkey.n_bytes = (char *)(ad->ad_pkey);
446 pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1;
447 if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) {
449 "authdes_refresh: keyserv(1m) is unable to encrypt session key");
452 cred->adc_fullname.key = ad->ad_xkey;
453 cred->adc_namekind = ADN_FULLNAME;
454 cred->adc_fullname.name = ad->ad_fullname;
463 authdes_destroy(AUTH *auth)
465 /* LINTED pointer alignment */
466 struct ad_private *ad = AUTH_PRIVATE(auth);
468 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
469 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
471 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
473 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
475 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
476 FREE(ad, sizeof (struct ad_private));
477 FREE(auth, sizeof(AUTH));
480 static struct auth_ops *
483 static struct auth_ops ops;
484 extern mutex_t authdes_ops_lock;
486 /* VARIABLES PROTECTED BY ops_lock: ops */
488 mutex_lock(&authdes_ops_lock);
489 if (ops.ah_nextverf == NULL) {
490 ops.ah_nextverf = authdes_nextverf;
491 ops.ah_marshal = authdes_marshal;
492 ops.ah_validate = authdes_validate;
493 ops.ah_refresh = authdes_refresh;
494 ops.ah_destroy = authdes_destroy;
496 mutex_unlock(&authdes_ops_lock);