/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
/*
* Copyright (c) 1988 by Sun Microsystems, Inc.
*/
/*
* auth_des.c, client-side implementation of DES authentication
*/
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/cdefs.h>
#include <rpc/des_crypt.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/auth_des.h>
#include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */
#include <sys/socket.h>
#undef NIS
#include <rpcsvc/nis.h>
#if defined(LIBC_SCCS) && !defined(lint)
/* from: static char sccsid[] = "@(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI"; */
static const char rcsid[] = "$FreeBSD: src/lib/libc/rpc/auth_des.c,v 1.3 1999/08/28 00:00:32 peter Exp $";
#endif
#define USEC_PER_SEC 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)
extern int rtime( struct sockaddr_in *, struct timeval *, struct timeval *);
extern bool_t xdr_authdes_cred(XDR *, struct authdes_cred *);
extern bool_t xdr_authdes_verf(XDR *, struct authdes_verf *);
extern bool_t __rpc_get_time_offset( struct timeval *, nis_server *, char *,
char **, struct sockaddr_in * );
#define debug(msg) /*printf("%s\n", msg) */
/*
* 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 struct auth_ops authdes_ops = {
authdes_nextverf,
authdes_marshal,
authdes_validate,
authdes_refresh,
authdes_destroy
};
#ifdef foo
static bool_t synchronize __P(( struct sockaddr *, struct timeval *));
#endif
/*
* 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 */
u_int ad_window; /* client specified window */
bool_t ad_dosync; /* synchronize? */
struct sockaddr ad_syncaddr; /* remote host to synch with */
char *ad_timehost; /* remote host to synch with */
struct timeval ad_timediff; /* server's time - client's time */
u_long ad_nickname; /* server's nickname for client */
struct authdes_cred ad_cred; /* storage for credential */
struct authdes_verf ad_verf; /* storage for verifier */
struct timeval ad_timestamp; /* timestamp sent */
des_block ad_xkey; /* encrypted conversation key */
u_char ad_pkey[1024]; /* Server's actual public key */
char *ad_netid; /* Timehost netid */
char *ad_uaddr; /* Timehost uaddr */
nis_server *ad_nis_srvr; /* NIS+ server struct */
};
/*
* Create the client des authentication object
*/
AUTH *
authdes_create(servername, window, syncaddr, ckey)
char *servername; /* network name of server */
u_int window; /* time to live */
struct sockaddr *syncaddr; /* optional addr of host to sync with */
des_block *ckey; /* optional conversation key to use*/
{
AUTH *auth;
struct ad_private *ad;
char namebuf[MAXNETNAMELEN+1];
u_char pkey_data[1024];
if (!getpublickey(servername, pkey_data))
return(NULL);
/*
* Allocate everything now
*/
auth = ALLOC(AUTH);
ad = ALLOC(struct ad_private);
(void) getnetname(namebuf);
ad->ad_fullnamelen = RNDUP(strlen(namebuf));
ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
ad->ad_servernamelen = strlen(servername);
ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
if (auth == NULL || ad == NULL || ad->ad_fullname == NULL ||
ad->ad_servername == NULL) {
debug("authdes_create: out of memory");
goto failed;
}
/*
* Set up private data
*/
bcopy(namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1);
bcopy(servername, ad->ad_servername, ad->ad_servernamelen + 1);
bcopy(pkey_data, ad->ad_pkey, strlen(pkey_data) + 1);
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");
return (NULL);
}
} 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 = &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)
FREE(ad, sizeof(struct ad_private));
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);
return (NULL);
}
/*
* Slightly modified version of authdes_create which takes the public key
* of the server principal as an argument. This spares us a call to
* getpublickey() which in the nameserver context can cause a deadlock.
*/
AUTH *
authdes_pk_create(servername, pkey, window, timehost, ckey, srvr)
char *servername; /* network name of server */
netobj *pkey; /* public key of server */
u_int window; /* time to live */
char *timehost; /* optional hostname to sync with */
des_block *ckey; /* optional conversation key to use */
nis_server *srvr; /* optional NIS+ server struct */
{
AUTH *auth;
struct ad_private *ad;
char namebuf[MAXNETNAMELEN+1];
/*
* Allocate everything now
*/
auth = ALLOC(AUTH);
if (auth == NULL) {
debug("authdes_pk_create: out of memory");
return (NULL);
}
ad = ALLOC(struct ad_private);
if (ad == NULL) {
debug("authdes_pk_create: out of memory");
goto failed;
}
ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */
ad->ad_timehost = NULL;
ad->ad_netid = NULL;
ad->ad_uaddr = NULL;
ad->ad_nis_srvr = NULL;
ad->ad_timediff.tv_sec = 0;
ad->ad_timediff.tv_usec = 0;
memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
if (!getnetname(namebuf))
goto failed;
ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf));
ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
ad->ad_servernamelen = strlen(servername);
ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
if (ad->ad_fullname == NULL || ad->ad_servername == NULL) {
debug("authdes_pk_create: out of memory");
goto failed;
}
if (timehost != NULL) {
ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
if (ad->ad_timehost == NULL) {
debug("authdes_pk_create: out of memory");
goto failed;
}
memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1);
ad->ad_dosync = TRUE;
} else if (srvr != NULL) {
ad->ad_nis_srvr = srvr; /* transient */
ad->ad_dosync = TRUE;
} else {
ad->ad_dosync = FALSE;
}
memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1);
ad->ad_window = window;
if (ckey == NULL) {
if (key_gendes(&auth->ah_key) < 0) {
debug("authdes_pk_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 = &authdes_ops;
auth->ah_private = (caddr_t)ad;
if (!authdes_refresh(auth)) {
goto failed;
}
ad->ad_nis_srvr = NULL; /* not needed any longer */
return (auth);
failed:
if (auth)
FREE(auth, sizeof (AUTH));
if (ad) {
if (ad->ad_fullname)
FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
if (ad->ad_servername)
FREE(ad->ad_servername, ad->ad_servernamelen + 1);
if (ad->ad_timehost)
FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
if (ad->ad_netid)
free(ad->ad_netid);
if (ad->ad_uaddr)
free(ad->ad_uaddr);
FREE(ad, sizeof (struct ad_private));
}
return (NULL);
}
/*
* 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;
long len;
int32_t *ixdr;
/*
* Figure out the "time", accounting for any time difference
* with the server if necessary.
*/
(void) gettimeofday(&ad->ad_timestamp, (struct timezone *)NULL);
ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
if (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) {
ad->ad_timestamp.tv_usec -= USEC_PER_SEC;
ad->ad_timestamp.tv_sec += 1;
}
/*
* XDR the timestamp and possibly some other things, then
* encrypt them.
*/
ixdr = (int32_t *)cryptbuf;
IXDR_PUT_LONG(ixdr, ad->ad_timestamp.tv_sec);
IXDR_PUT_LONG(ixdr, ad->ad_timestamp.tv_usec);
if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
IXDR_PUT_U_LONG(ixdr, ad->ad_window);
IXDR_PUT_U_LONG(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))) {
IXDR_PUT_LONG(ixdr, AUTH_DES);
IXDR_PUT_LONG(ixdr, len);
} else {
ATTEMPT(xdr_putlong(xdrs, (long *)&auth->ah_cred.oa_flavor));
ATTEMPT(xdr_putlong(xdrs, &len));
}
ATTEMPT(xdr_authdes_cred(xdrs, cred));
len = (2 + 1)*BYTES_PER_XDR_UNIT;
if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
IXDR_PUT_LONG(ixdr, AUTH_DES);
IXDR_PUT_LONG(ixdr, len);
} else {
ATTEMPT(xdr_putlong(xdrs, (long *)&auth->ah_verf.oa_flavor));
ATTEMPT(xdr_putlong(xdrs, &len));
}
ATTEMPT(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 u_long *ixdr;
if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) {
return (FALSE);
}
ixdr = (u_long *)rverf->oa_base;
verf.adv_xtimestamp.key.high = (u_long)*ixdr++;
verf.adv_xtimestamp.key.low = (u_long)*ixdr++;
verf.adv_int_u = (u_long)*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 = (u_long *)verf.adv_xtimestamp.c;
verf.adv_timestamp.tv_sec = IXDR_GET_LONG(ixdr) + 1;
verf.adv_timestamp.tv_usec = IXDR_GET_LONG(ixdr);
/*
* validate
*/
if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
sizeof(struct 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)
{
struct ad_private *ad = AUTH_PRIVATE(auth);
struct authdes_cred *cred = &ad->ad_cred;
netobj pkey;
if (ad->ad_dosync &&
#ifdef old
!synchronize(&ad->ad_syncaddr, &ad->ad_timediff)) {
#else
!__rpc_get_time_offset(&ad->ad_timediff,ad->ad_nis_srvr,
ad->ad_timehost, &(ad->ad_uaddr),
(struct sockaddr_in *)&(ad->ad_syncaddr))) {
#endif
/*
* Hope the clocks are synced!
*/
ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0;
ad->ad_dosync = 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));
}
#ifdef old
/*
* Synchronize with the server at the given address, that is,
* adjust timep to reflect the delta between our clocks
*/
static bool_t
synchronize(syncaddr, timep)
struct sockaddr *syncaddr;
struct timeval *timep;
{
struct timeval mytime;
struct timeval timeout;
timeout.tv_sec = RTIME_TIMEOUT;
timeout.tv_usec = 0;
if (rtime((struct sockaddr_in *)syncaddr, timep, NULL /*&timeout*/) < 0) {
return (FALSE);
}
(void) 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 += USEC_PER_SEC;
}
timep->tv_usec -= mytime.tv_usec;
return (TRUE);
}
#endif
