#include <machine/rtems-bsd-user-space.h>
/*-
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1988 by Sun Microsystems, Inc.
*/
/*
* auth_des.c, client-side implementation of DES authentication
*/
#include "namespace.h"
#include "reentrant.h"
#include <err.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/cdefs.h>
#include <rpc/des_crypt.h>
#include <syslog.h>
#include <rpc/types.h>
#include <rpc/auth.h>
#include <rpc/auth_des.h>
#include <rpc/clnt.h>
#include <rpc/xdr.h>
#include <sys/socket.h>
#undef NIS
#include <rpcsvc/nis.h>
#include "un-namespace.h"
#include "mt_misc.h"
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define USEC_PER_SEC 1000000
#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 bool_t xdr_authdes_cred( XDR *, struct authdes_cred *);
extern bool_t xdr_authdes_verf( XDR *, struct authdes_verf *);
extern int key_encryptsession_pk(char *, netobj *, des_block *);
extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *,
char **, char **);
/*
* 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 *, void *);
static void authdes_destroy(AUTH *);
static struct auth_ops *authdes_ops(void);
/*
* 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 netbuf 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_int 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 */
};
AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *,
const des_block *, nis_server *);
/*
* documented version of authdes_seccreate
*/
/*
servername: network name of server
win: time to live
timehost: optional hostname to sync with
ckey: optional conversation key to use
*/
AUTH *
authdes_seccreate(const char *servername, const u_int win,
const char *timehost, const des_block *ckey)
{
u_char pkey_data[1024];
netobj pkey;
AUTH *dummy;
if (! getpublickey(servername, (char *) pkey_data)) {
syslog(LOG_ERR,
"authdes_seccreate: no public key found for %s",
servername);
return (NULL);
}
pkey.n_bytes = (char *) pkey_data;
pkey.n_len = (u_int)strlen((char *)pkey_data) + 1;
dummy = authdes_pk_seccreate(servername, &pkey, win, timehost,
ckey, NULL);
return (dummy);
}
/*
* Slightly modified version of authdessec_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_seccreate(const char *servername, netobj *pkey, u_int window,
const char *timehost, const des_block *ckey, nis_server *srvr)
{
AUTH *auth;
struct ad_private *ad;
char namebuf[MAXNETNAMELEN+1];
/*
* Allocate everything now
*/
auth = ALLOC(AUTH);
if (auth == NULL) {
syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
return (NULL);
}
ad = ALLOC(struct ad_private);
if (ad == NULL) {
syslog(LOG_ERR, "authdes_pk_seccreate: 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) {
syslog(LOG_ERR, "authdes_seccreate: out of memory");
goto failed;
}
if (timehost != NULL) {
ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
if (ad->ad_timehost == NULL) {
syslog(LOG_ERR, "authdes_seccreate: 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) {
syslog(LOG_ERR,
"authdes_seccreate: keyserv(1m) is unable to generate session 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, NULL)) {
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, strlen(ad->ad_netid) + 1);
if (ad->ad_uaddr)
FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
FREE(ad, sizeof (struct ad_private));
}
return (NULL);
}
/*
* Implement the five authentication operations
*/
/*
* 1. Next Verifier
*/
/*ARGSUSED*/
static void
authdes_nextverf(AUTH *auth __unused)
{
/* what the heck am I supposed to do??? */
}
/*
* 2. Marshal
*/
static bool_t
authdes_marshal(AUTH *auth, XDR *xdrs)
{
/* LINTED pointer alignment */
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;
int len;
rpc_inline_t *ixdr;
/*
* Figure out the "time", accounting for any time difference
* with the server if necessary.
*/
(void)gettimeofday(&ad->ad_timestamp, NULL);
ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) {
ad->ad_timestamp.tv_usec -= USEC_PER_SEC;
ad->ad_timestamp.tv_sec++;
}
/*
* XDR the timestamp and possibly some other things, then
* encrypt them.
*/
ixdr = (rpc_inline_t *)cryptbuf;
IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec);
IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec);
if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
IXDR_PUT_U_INT32(ixdr, ad->ad_window);
IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1);
ivec.key.high = ivec.key.low = 0;
status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
(u_int) 2 * sizeof (des_block),
DES_ENCRYPT | DES_HW, (char *)&ivec);
} else {
status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
(u_int) sizeof (des_block),
DES_ENCRYPT | DES_HW);
}
if (DES_FAILED(status)) {
syslog(LOG_ERR, "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_INT32(ixdr, AUTH_DES);
IXDR_PUT_INT32(ixdr, len);
} else {
ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor));
ATTEMPT(xdr_putint32(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_INT32(ixdr, AUTH_DES);
IXDR_PUT_INT32(ixdr, len);
} else {
ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor));
ATTEMPT(xdr_putint32(xdrs, &len));
}
ATTEMPT(xdr_authdes_verf(xdrs, verf));
return (TRUE);
}
/*
* 3. Validate
*/
static bool_t
authdes_validate(AUTH *auth, struct opaque_auth *rverf)
{
/* LINTED pointer alignment */
struct ad_private *ad = AUTH_PRIVATE(auth);
struct authdes_verf verf;
int status;
uint32_t *ixdr;
des_block buf;
if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) {
return (FALSE);
}
/* LINTED pointer alignment */
ixdr = (uint32_t *)rverf->oa_base;
buf.key.high = (uint32_t)*ixdr++;
buf.key.low = (uint32_t)*ixdr++;
verf.adv_int_u = (uint32_t)*ixdr++;
/*
* Decrypt the timestamp
*/
status = ecb_crypt((char *)&auth->ah_key, (char *)&buf,
(u_int)sizeof (des_block), DES_DECRYPT | DES_HW);
if (DES_FAILED(status)) {
syslog(LOG_ERR, "authdes_validate: DES decryption failure");
return (FALSE);
}
/*
* xdr the decrypted timestamp
*/
/* LINTED pointer alignment */
ixdr = (uint32_t *)buf.c;
verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1;
verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr);
/*
* validate
*/
if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
sizeof(struct timeval)) != 0) {
syslog(LOG_DEBUG, "authdes_validate: verifier mismatch");
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
*/
/*ARGSUSED*/
static bool_t
authdes_refresh(AUTH *auth, void *dummy __unused)
{
/* LINTED pointer alignment */
struct ad_private *ad = AUTH_PRIVATE(auth);
struct authdes_cred *cred = &ad->ad_cred;
int ok;
netobj pkey;
if (ad->ad_dosync) {
ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr,
ad->ad_timehost, &(ad->ad_uaddr),
&(ad->ad_netid));
if (! ok) {
/*
* Hope the clocks are synced!
*/
ad->ad_dosync = 0;
syslog(LOG_DEBUG,
"authdes_refresh: unable to synchronize clock");
}
}
ad->ad_xkey = auth->ah_key;
pkey.n_bytes = (char *)(ad->ad_pkey);
pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1;
if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) {
syslog(LOG_INFO,
"authdes_refresh: keyserv(1m) is unable to encrypt session 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)
{
/* LINTED pointer alignment */
struct ad_private *ad = AUTH_PRIVATE(auth);
FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
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, strlen(ad->ad_netid) + 1);
if (ad->ad_uaddr)
FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
FREE(ad, sizeof (struct ad_private));
FREE(auth, sizeof(AUTH));
}
static struct auth_ops *
authdes_ops(void)
{
static struct auth_ops ops;
/* VARIABLES PROTECTED BY ops_lock: ops */
mutex_lock(&authdes_ops_lock);
if (ops.ah_nextverf == NULL) {
ops.ah_nextverf = authdes_nextverf;
ops.ah_marshal = authdes_marshal;
ops.ah_validate = authdes_validate;
ops.ah_refresh = authdes_refresh;
ops.ah_destroy = authdes_destroy;
}
mutex_unlock(&authdes_ops_lock);
return (&ops);
}
