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29 * @(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI
30 * $FreeBSD: src/lib/libc/rpc/auth_des.c,v 1.10 2006/02/27 22:10:58 deischen Exp $
31 * $DragonFly: src/lib/libc/rpc/auth_des.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
34 * Copyright (c) 1988 by Sun Microsystems, Inc.
37 * auth_des.c, client-side implementation of DES authentication
40 #include "namespace.h"
41 #include "reentrant.h"
47 #include <sys/cdefs.h>
48 #include <rpc/des_crypt.h>
50 #include <rpc/types.h>
52 #include <rpc/auth_des.h>
55 #include <sys/socket.h>
57 #include <rpcsvc/nis.h>
58 #include "un-namespace.h"
61 #define USEC_PER_SEC 1000000
62 #define RTIME_TIMEOUT 5 /* seconds to wait for sync */
64 #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private
65 #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type))
66 #define FREE(ptr, size) mem_free((char *)(ptr), (int) size)
67 #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE)
69 extern bool_t xdr_authdes_cred(XDR *, struct authdes_cred *);
70 extern bool_t xdr_authdes_verf(XDR *, struct authdes_verf *);
72 extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *,
77 * DES authenticator operations vector
79 static void authdes_nextverf(AUTH *);
80 static bool_t authdes_marshal(AUTH *, XDR *);
81 static bool_t authdes_validate(AUTH *, struct opaque_auth *);
82 static bool_t authdes_refresh(AUTH *, void *);
83 static void authdes_destroy(AUTH *);
85 static struct auth_ops *authdes_ops(void);
88 * This struct is pointed to by the ah_private field of an "AUTH *"
91 char *ad_fullname; /* client's full name */
92 u_int ad_fullnamelen; /* length of name, rounded up */
93 char *ad_servername; /* server's full name */
94 u_int ad_servernamelen; /* length of name, rounded up */
95 u_int ad_window; /* client specified window */
96 bool_t ad_dosync; /* synchronize? */
97 struct netbuf ad_syncaddr; /* remote host to synch with */
98 char *ad_timehost; /* remote host to synch with */
99 struct timeval ad_timediff; /* server's time - client's time */
100 u_int ad_nickname; /* server's nickname for client */
101 struct authdes_cred ad_cred; /* storage for credential */
102 struct authdes_verf ad_verf; /* storage for verifier */
103 struct timeval ad_timestamp; /* timestamp sent */
104 des_block ad_xkey; /* encrypted conversation key */
105 u_char ad_pkey[1024]; /* Server's actual public key */
106 char *ad_netid; /* Timehost netid */
107 char *ad_uaddr; /* Timehost uaddr */
108 nis_server *ad_nis_srvr; /* NIS+ server struct */
111 AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *,
112 const des_block *, nis_server *);
114 * documented version of authdes_seccreate
117 servername: network name of server
119 timehost: optional hostname to sync with
120 ckey: optional conversation key to use
124 authdes_seccreate(const char *servername, const u_int win,
125 const char *timehost, const des_block *ckey)
127 u_char pkey_data[1024];
131 if (! getpublickey(servername, (char *) pkey_data)) {
133 "authdes_seccreate: no public key found for %s",
138 pkey.n_bytes = (char *) pkey_data;
139 pkey.n_len = (u_int)strlen((char *)pkey_data) + 1;
140 dummy = authdes_pk_seccreate(servername, &pkey, win, timehost,
146 * Slightly modified version of authdessec_create which takes the public key
147 * of the server principal as an argument. This spares us a call to
148 * getpublickey() which in the nameserver context can cause a deadlock.
151 authdes_pk_seccreate(const char *servername, netobj *pkey, u_int window,
152 const char *timehost, const des_block *ckey,
156 struct ad_private *ad;
157 char namebuf[MAXNETNAMELEN+1];
160 * Allocate everything now
164 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
167 ad = ALLOC(struct ad_private);
169 syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
172 ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */
173 ad->ad_timehost = NULL;
176 ad->ad_nis_srvr = NULL;
177 ad->ad_timediff.tv_sec = 0;
178 ad->ad_timediff.tv_usec = 0;
179 memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
180 if (!getnetname(namebuf))
182 ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf));
183 ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
184 ad->ad_servernamelen = strlen(servername);
185 ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
187 if (ad->ad_fullname == NULL || ad->ad_servername == NULL) {
188 syslog(LOG_ERR, "authdes_seccreate: out of memory");
191 if (timehost != NULL) {
192 ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
193 if (ad->ad_timehost == NULL) {
194 syslog(LOG_ERR, "authdes_seccreate: out of memory");
197 memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1);
198 ad->ad_dosync = TRUE;
199 } else if (srvr != NULL) {
200 ad->ad_nis_srvr = srvr; /* transient */
201 ad->ad_dosync = TRUE;
203 ad->ad_dosync = FALSE;
205 memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
206 memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1);
207 ad->ad_window = window;
209 if (key_gendes(&auth->ah_key) < 0) {
211 "authdes_seccreate: keyserv(1m) is unable to generate session key");
215 auth->ah_key = *ckey;
221 auth->ah_cred.oa_flavor = AUTH_DES;
222 auth->ah_verf.oa_flavor = AUTH_DES;
223 auth->ah_ops = authdes_ops();
224 auth->ah_private = (caddr_t)ad;
226 if (!authdes_refresh(auth, NULL)) {
229 ad->ad_nis_srvr = NULL; /* not needed any longer */
234 FREE(auth, sizeof (AUTH));
237 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
238 if (ad->ad_servername)
239 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
241 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
243 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
245 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
246 FREE(ad, sizeof (struct ad_private));
252 * Implement the five authentication operations
261 authdes_nextverf(AUTH *auth)
263 /* what the heck am I supposed to do??? */
271 authdes_marshal(AUTH *auth, XDR *xdrs)
273 /* LINTED pointer alignment */
274 struct ad_private *ad = AUTH_PRIVATE(auth);
275 struct authdes_cred *cred = &ad->ad_cred;
276 struct authdes_verf *verf = &ad->ad_verf;
277 des_block cryptbuf[2];
284 * Figure out the "time", accounting for any time difference
285 * with the server if necessary.
287 gettimeofday(&ad->ad_timestamp, (struct timezone *)NULL);
288 ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
289 ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
290 while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) {
291 ad->ad_timestamp.tv_usec -= USEC_PER_SEC;
292 ad->ad_timestamp.tv_sec++;
296 * XDR the timestamp and possibly some other things, then
299 ixdr = (rpc_inline_t *)cryptbuf;
300 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec);
301 IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec);
302 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
303 IXDR_PUT_U_INT32(ixdr, ad->ad_window);
304 IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1);
305 ivec.key.high = ivec.key.low = 0;
306 status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
307 (u_int) 2 * sizeof (des_block),
308 DES_ENCRYPT | DES_HW, (char *)&ivec);
310 status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
311 (u_int) sizeof (des_block),
312 DES_ENCRYPT | DES_HW);
314 if (DES_FAILED(status)) {
315 syslog(LOG_ERR, "authdes_marshal: DES encryption failure");
318 ad->ad_verf.adv_xtimestamp = cryptbuf[0];
319 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
320 ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
321 ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
323 ad->ad_cred.adc_nickname = ad->ad_nickname;
324 ad->ad_verf.adv_winverf = 0;
328 * Serialize the credential and verifier into opaque
329 * authentication data.
331 if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
332 len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen);
334 len = (1 + 1)*BYTES_PER_XDR_UNIT;
337 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
338 IXDR_PUT_INT32(ixdr, AUTH_DES);
339 IXDR_PUT_INT32(ixdr, len);
341 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor));
342 ATTEMPT(xdr_putint32(xdrs, &len));
344 ATTEMPT(xdr_authdes_cred(xdrs, cred));
346 len = (2 + 1)*BYTES_PER_XDR_UNIT;
347 if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
348 IXDR_PUT_INT32(ixdr, AUTH_DES);
349 IXDR_PUT_INT32(ixdr, len);
351 ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor));
352 ATTEMPT(xdr_putint32(xdrs, &len));
354 ATTEMPT(xdr_authdes_verf(xdrs, verf));
363 authdes_validate(AUTH *auth, struct opaque_auth *rverf)
365 /* LINTED pointer alignment */
366 struct ad_private *ad = AUTH_PRIVATE(auth);
367 struct authdes_verf verf;
372 if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) {
375 /* LINTED pointer alignment */
376 ixdr = (uint32_t *)rverf->oa_base;
377 buf.key.high = (uint32_t)*ixdr++;
378 buf.key.low = (uint32_t)*ixdr++;
379 verf.adv_int_u = (uint32_t)*ixdr++;
382 * Decrypt the timestamp
384 status = ecb_crypt((char *)&auth->ah_key, (char *)&buf,
385 (u_int)sizeof (des_block), DES_DECRYPT | DES_HW);
387 if (DES_FAILED(status)) {
388 syslog(LOG_ERR, "authdes_validate: DES decryption failure");
393 * xdr the decrypted timestamp
395 /* LINTED pointer alignment */
396 ixdr = (uint32_t *)buf.c;
397 verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1;
398 verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr);
403 if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
404 sizeof(struct timeval)) != 0) {
405 syslog(LOG_DEBUG, "authdes_validate: verifier mismatch");
410 * We have a nickname now, let's use it
412 ad->ad_nickname = verf.adv_nickname;
413 ad->ad_cred.adc_namekind = ADN_NICKNAME;
422 authdes_refresh(AUTH *auth, void *dummy)
424 /* LINTED pointer alignment */
425 struct ad_private *ad = AUTH_PRIVATE(auth);
426 struct authdes_cred *cred = &ad->ad_cred;
431 ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr,
432 ad->ad_timehost, &(ad->ad_uaddr),
436 * Hope the clocks are synced!
440 "authdes_refresh: unable to synchronize clock");
443 ad->ad_xkey = auth->ah_key;
444 pkey.n_bytes = (char *)(ad->ad_pkey);
445 pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1;
446 if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) {
448 "authdes_refresh: keyserv(1m) is unable to encrypt session key");
451 cred->adc_fullname.key = ad->ad_xkey;
452 cred->adc_namekind = ADN_FULLNAME;
453 cred->adc_fullname.name = ad->ad_fullname;
462 authdes_destroy(AUTH *auth)
464 /* LINTED pointer alignment */
465 struct ad_private *ad = AUTH_PRIVATE(auth);
467 FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
468 FREE(ad->ad_servername, ad->ad_servernamelen + 1);
470 FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
472 FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
474 FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
475 FREE(ad, sizeof(struct ad_private));
476 FREE(auth, sizeof(AUTH));
479 static struct auth_ops *
482 static struct auth_ops ops;
484 /* VARIABLES PROTECTED BY ops_lock: ops */
486 mutex_lock(&authdes_ops_lock);
487 if (ops.ah_nextverf == NULL) {
488 ops.ah_nextverf = authdes_nextverf;
489 ops.ah_marshal = authdes_marshal;
490 ops.ah_validate = authdes_validate;
491 ops.ah_refresh = authdes_refresh;
492 ops.ah_destroy = authdes_destroy;
494 mutex_unlock(&authdes_ops_lock);