OpenSolaris_b135/lib/libnsl/rpc/auth_des.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley
* 4.3 BSD under license from the Regents of the University of
* California.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* auth_des.c, client-side implementation of DES authentication
*
*/
#include "mt.h"
#include "rpc_mt.h"
#include <rpc/rpc.h>
#include <rpc/des_crypt.h>
#include <syslog.h>
#include <stdlib.h>
#include <string.h>
#include <synch.h>
#undef NIS
#include <rpcsvc/nis.h>
#define USEC_PER_SEC 1000000
#define RTIME_TIMEOUT 5 /* seconds to wait for sync */
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(const char *, netobj *, des_block *);
extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *,
char **, char **);
static struct auth_ops *authdes_ops(void);
static bool_t authdes_refresh(AUTH *, void *);
/*
* This struct is pointed to by the ah_private field of an "AUTH *"
*/
struct ad_private {
char *ad_fullname; /* client's full name */
uint_t ad_fullnamelen; /* length of name, rounded up */
char *ad_servername; /* server's full name */
size_t ad_servernamelen; /* length of name, rounded up */
uint_t ad_window; /* client specified window */
bool_t ad_dosync; /* synchronize? */
char *ad_timehost; /* remote host to sync with */
struct timeval ad_timediff; /* server's time - client's time */
uint_t 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 */
uchar_t ad_pkey[1024]; /* Servers actual public key */
char *ad_netid; /* Timehost netid */
char *ad_uaddr; /* Timehost uaddr */
nis_server *ad_nis_srvr; /* NIS+ server struct */
};
extern AUTH *authdes_pk_seccreate(const char *, netobj *, uint_t, 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 uint_t win,
const char *timehost, const des_block *ckey)
{
uchar_t pkey_data[1024];
netobj pkey;
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 = (uint_t)strlen((char *)pkey_data) + 1;
return (authdes_pk_seccreate(servername, &pkey, win, timehost,
ckey, NULL));
}
/*
* Slightly modified version of authdes_seccreate 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, uint_t 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 = malloc(sizeof (AUTH));
if (auth == NULL) {
syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
return (NULL);
}
ad = malloc(sizeof (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;
(void) memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
if (!getnetname(namebuf))
goto failed;
ad->ad_fullnamelen = RNDUP((uint_t)strlen(namebuf));
ad->ad_fullname = malloc(ad->ad_fullnamelen + 1);
ad->ad_servernamelen = strlen(servername);
ad->ad_servername = malloc(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 = malloc(strlen(timehost) + 1);
if (ad->ad_timehost == NULL) {
syslog(LOG_ERR, "authdes_seccreate: out of memory");
goto failed;
}
(void) 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;
}
(void) memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
(void) 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);
if (ad) {
if (ad->ad_fullname)
free(ad->ad_fullname);
if (ad->ad_servername)
free(ad->ad_servername);
if (ad->ad_timehost)
free(ad->ad_timehost);
if (ad->ad_netid)
free(ad->ad_netid);
if (ad->ad_uaddr)
free(ad->ad_uaddr);
free(ad);
}
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)
{
/* LINTED pointer alignment */
struct ad_private *ad = (struct ad_private *)auth->ah_private;
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,
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)) {
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 {
if (!xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor))
return (FALSE);
if (!xdr_putint32(xdrs, &len))
return (FALSE);
}
if (!xdr_authdes_cred(xdrs, cred))
return (FALSE);
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 {
if (!xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor))
return (FALSE);
if (!xdr_putint32(xdrs, &len))
return (FALSE);
}
return (xdr_authdes_verf(xdrs, verf));
}
/*
* 3. Validate
*/
static bool_t
authdes_validate(AUTH *auth, struct opaque_auth *rverf)
{
/* LINTED pointer alignment */
struct ad_private *ad = (struct ad_private *)auth->ah_private;
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,
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 (memcmp(&ad->ad_timestamp, &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)
{
/* LINTED pointer alignment */
struct ad_private *ad = (struct ad_private *)auth->ah_private;
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 = (uint_t)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 = (struct ad_private *)auth->ah_private;
free(ad->ad_fullname);
free(ad->ad_servername);
if (ad->ad_timehost)
free(ad->ad_timehost);
if (ad->ad_netid)
free(ad->ad_netid);
if (ad->ad_uaddr)
free(ad->ad_uaddr);
free(ad);
free(auth);
}
static struct auth_ops *
authdes_ops(void)
{
static struct auth_ops ops;
extern mutex_t ops_lock;
/* VARIABLES PROTECTED BY ops_lock: ops */
(void) mutex_lock(&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;
}
(void) mutex_unlock(&ops_lock);
return (&ops);
}