498 lines
14 KiB
C
498 lines
14 KiB
C
/*-
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1988 by Sun Microsystems, Inc.
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*/
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/*
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* auth_des.c, client-side implementation of DES authentication
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*/
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#include "namespace.h"
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#include "reentrant.h"
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/cdefs.h>
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#include <rpc/des_crypt.h>
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#include <syslog.h>
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#include <rpc/types.h>
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#include <rpc/auth.h>
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#include <rpc/auth_des.h>
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#include <rpc/clnt.h>
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#include <rpc/xdr.h>
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#include <sys/socket.h>
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#undef NIS
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#include <rpcsvc/nis.h>
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#include "un-namespace.h"
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#include "mt_misc.h"
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define USEC_PER_SEC 1000000
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#define RTIME_TIMEOUT 5 /* seconds to wait for sync */
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#define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private
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#define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type))
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#define FREE(ptr, size) mem_free((char *)(ptr), (int) size)
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#define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE)
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extern bool_t xdr_authdes_cred( XDR *, struct authdes_cred *);
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extern bool_t xdr_authdes_verf( XDR *, struct authdes_verf *);
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extern int key_encryptsession_pk(char *, netobj *, des_block *);
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extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *,
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char **, char **);
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/*
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* DES authenticator operations vector
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*/
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static void authdes_nextverf(AUTH *);
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static bool_t authdes_marshal(AUTH *, XDR *);
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static bool_t authdes_validate(AUTH *, struct opaque_auth *);
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static bool_t authdes_refresh(AUTH *, void *);
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static void authdes_destroy(AUTH *);
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static struct auth_ops *authdes_ops(void);
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/*
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* This struct is pointed to by the ah_private field of an "AUTH *"
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*/
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struct ad_private {
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char *ad_fullname; /* client's full name */
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u_int ad_fullnamelen; /* length of name, rounded up */
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char *ad_servername; /* server's full name */
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u_int ad_servernamelen; /* length of name, rounded up */
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u_int ad_window; /* client specified window */
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bool_t ad_dosync; /* synchronize? */
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struct netbuf ad_syncaddr; /* remote host to synch with */
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char *ad_timehost; /* remote host to synch with */
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struct timeval ad_timediff; /* server's time - client's time */
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u_int ad_nickname; /* server's nickname for client */
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struct authdes_cred ad_cred; /* storage for credential */
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struct authdes_verf ad_verf; /* storage for verifier */
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struct timeval ad_timestamp; /* timestamp sent */
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des_block ad_xkey; /* encrypted conversation key */
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u_char ad_pkey[1024]; /* Server's actual public key */
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char *ad_netid; /* Timehost netid */
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char *ad_uaddr; /* Timehost uaddr */
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nis_server *ad_nis_srvr; /* NIS+ server struct */
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};
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AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *,
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const des_block *, nis_server *);
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/*
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* documented version of authdes_seccreate
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*/
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/*
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servername: network name of server
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win: time to live
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timehost: optional hostname to sync with
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ckey: optional conversation key to use
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*/
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AUTH *
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authdes_seccreate(const char *servername, const u_int win,
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const char *timehost, const des_block *ckey)
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{
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u_char pkey_data[1024];
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netobj pkey;
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AUTH *dummy;
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if (! getpublickey(servername, (char *) pkey_data)) {
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syslog(LOG_ERR,
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"authdes_seccreate: no public key found for %s",
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servername);
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return (NULL);
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}
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pkey.n_bytes = (char *) pkey_data;
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pkey.n_len = (u_int)strlen((char *)pkey_data) + 1;
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dummy = authdes_pk_seccreate(servername, &pkey, win, timehost,
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ckey, NULL);
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return (dummy);
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}
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/*
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* Slightly modified version of authdessec_create which takes the public key
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* of the server principal as an argument. This spares us a call to
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* getpublickey() which in the nameserver context can cause a deadlock.
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*/
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AUTH *
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authdes_pk_seccreate(const char *servername, netobj *pkey, u_int window,
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const char *timehost, const des_block *ckey, nis_server *srvr)
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{
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AUTH *auth;
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struct ad_private *ad;
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char namebuf[MAXNETNAMELEN+1];
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/*
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* Allocate everything now
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*/
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auth = ALLOC(AUTH);
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if (auth == NULL) {
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syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
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return (NULL);
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}
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ad = ALLOC(struct ad_private);
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if (ad == NULL) {
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syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
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goto failed;
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}
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ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */
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ad->ad_timehost = NULL;
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ad->ad_netid = NULL;
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ad->ad_uaddr = NULL;
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ad->ad_nis_srvr = NULL;
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ad->ad_timediff.tv_sec = 0;
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ad->ad_timediff.tv_usec = 0;
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memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
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if (!getnetname(namebuf))
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goto failed;
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ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf));
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ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
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ad->ad_servernamelen = strlen(servername);
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ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
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if (ad->ad_fullname == NULL || ad->ad_servername == NULL) {
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syslog(LOG_ERR, "authdes_seccreate: out of memory");
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goto failed;
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}
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if (timehost != NULL) {
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ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
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if (ad->ad_timehost == NULL) {
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syslog(LOG_ERR, "authdes_seccreate: out of memory");
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goto failed;
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}
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memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1);
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ad->ad_dosync = TRUE;
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} else if (srvr != NULL) {
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ad->ad_nis_srvr = srvr; /* transient */
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ad->ad_dosync = TRUE;
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} else {
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ad->ad_dosync = FALSE;
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}
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memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
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memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1);
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ad->ad_window = window;
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if (ckey == NULL) {
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if (key_gendes(&auth->ah_key) < 0) {
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syslog(LOG_ERR,
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"authdes_seccreate: keyserv(1m) is unable to generate session key");
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goto failed;
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}
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} else {
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auth->ah_key = *ckey;
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}
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/*
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* Set up auth handle
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*/
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auth->ah_cred.oa_flavor = AUTH_DES;
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auth->ah_verf.oa_flavor = AUTH_DES;
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auth->ah_ops = authdes_ops();
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auth->ah_private = (caddr_t)ad;
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if (!authdes_refresh(auth, NULL)) {
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goto failed;
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}
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ad->ad_nis_srvr = NULL; /* not needed any longer */
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return (auth);
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failed:
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if (auth)
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FREE(auth, sizeof (AUTH));
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if (ad) {
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if (ad->ad_fullname)
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FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
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if (ad->ad_servername)
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FREE(ad->ad_servername, ad->ad_servernamelen + 1);
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if (ad->ad_timehost)
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FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
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if (ad->ad_netid)
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FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
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if (ad->ad_uaddr)
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FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
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FREE(ad, sizeof (struct ad_private));
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}
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return (NULL);
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}
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/*
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* Implement the five authentication operations
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*/
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/*
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* 1. Next Verifier
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*/
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/*ARGSUSED*/
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static void
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authdes_nextverf(AUTH *auth __unused)
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{
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/* what the heck am I supposed to do??? */
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}
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/*
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* 2. Marshal
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*/
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static bool_t
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authdes_marshal(AUTH *auth, XDR *xdrs)
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{
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/* LINTED pointer alignment */
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struct ad_private *ad = AUTH_PRIVATE(auth);
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struct authdes_cred *cred = &ad->ad_cred;
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struct authdes_verf *verf = &ad->ad_verf;
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des_block cryptbuf[2];
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des_block ivec;
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int status;
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int len;
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rpc_inline_t *ixdr;
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/*
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* Figure out the "time", accounting for any time difference
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* with the server if necessary.
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*/
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(void)gettimeofday(&ad->ad_timestamp, NULL);
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ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
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ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
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while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) {
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ad->ad_timestamp.tv_usec -= USEC_PER_SEC;
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ad->ad_timestamp.tv_sec++;
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}
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/*
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* XDR the timestamp and possibly some other things, then
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* encrypt them.
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*/
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ixdr = (rpc_inline_t *)cryptbuf;
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IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec);
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IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec);
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if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
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IXDR_PUT_U_INT32(ixdr, ad->ad_window);
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IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1);
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ivec.key.high = ivec.key.low = 0;
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status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
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(u_int) 2 * sizeof (des_block),
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DES_ENCRYPT | DES_HW, (char *)&ivec);
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} else {
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status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
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(u_int) sizeof (des_block),
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DES_ENCRYPT | DES_HW);
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}
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if (DES_FAILED(status)) {
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syslog(LOG_ERR, "authdes_marshal: DES encryption failure");
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return (FALSE);
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}
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ad->ad_verf.adv_xtimestamp = cryptbuf[0];
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if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
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ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
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ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
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} else {
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ad->ad_cred.adc_nickname = ad->ad_nickname;
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ad->ad_verf.adv_winverf = 0;
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}
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/*
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* Serialize the credential and verifier into opaque
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* authentication data.
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*/
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if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
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len = ((1 + 1 + 2 + 1)*BYTES_PER_XDR_UNIT + ad->ad_fullnamelen);
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} else {
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len = (1 + 1)*BYTES_PER_XDR_UNIT;
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}
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if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
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IXDR_PUT_INT32(ixdr, AUTH_DES);
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IXDR_PUT_INT32(ixdr, len);
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} else {
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ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor));
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ATTEMPT(xdr_putint32(xdrs, &len));
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}
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ATTEMPT(xdr_authdes_cred(xdrs, cred));
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len = (2 + 1)*BYTES_PER_XDR_UNIT;
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if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
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IXDR_PUT_INT32(ixdr, AUTH_DES);
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IXDR_PUT_INT32(ixdr, len);
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} else {
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ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor));
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ATTEMPT(xdr_putint32(xdrs, &len));
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}
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ATTEMPT(xdr_authdes_verf(xdrs, verf));
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return (TRUE);
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}
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/*
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* 3. Validate
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*/
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static bool_t
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authdes_validate(AUTH *auth, struct opaque_auth *rverf)
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{
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/* LINTED pointer alignment */
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struct ad_private *ad = AUTH_PRIVATE(auth);
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struct authdes_verf verf;
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int status;
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uint32_t *ixdr;
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des_block buf;
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if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) {
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return (FALSE);
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}
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/* LINTED pointer alignment */
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ixdr = (uint32_t *)rverf->oa_base;
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buf.key.high = (uint32_t)*ixdr++;
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buf.key.low = (uint32_t)*ixdr++;
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verf.adv_int_u = (uint32_t)*ixdr++;
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/*
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* Decrypt the timestamp
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*/
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status = ecb_crypt((char *)&auth->ah_key, (char *)&buf,
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(u_int)sizeof (des_block), DES_DECRYPT | DES_HW);
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if (DES_FAILED(status)) {
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syslog(LOG_ERR, "authdes_validate: DES decryption failure");
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return (FALSE);
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}
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/*
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* xdr the decrypted timestamp
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*/
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/* LINTED pointer alignment */
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ixdr = (uint32_t *)buf.c;
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verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1;
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verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr);
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/*
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* validate
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*/
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if (bcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
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sizeof(struct timeval)) != 0) {
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syslog(LOG_DEBUG, "authdes_validate: verifier mismatch");
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return (FALSE);
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}
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/*
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* We have a nickname now, let's use it
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*/
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ad->ad_nickname = verf.adv_nickname;
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ad->ad_cred.adc_namekind = ADN_NICKNAME;
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return (TRUE);
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}
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/*
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* 4. Refresh
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*/
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/*ARGSUSED*/
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static bool_t
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authdes_refresh(AUTH *auth, void *dummy __unused)
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{
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/* LINTED pointer alignment */
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struct ad_private *ad = AUTH_PRIVATE(auth);
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struct authdes_cred *cred = &ad->ad_cred;
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int ok;
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netobj pkey;
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if (ad->ad_dosync) {
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ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr,
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ad->ad_timehost, &(ad->ad_uaddr),
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&(ad->ad_netid));
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if (! ok) {
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/*
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* Hope the clocks are synced!
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*/
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ad->ad_dosync = 0;
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syslog(LOG_DEBUG,
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"authdes_refresh: unable to synchronize clock");
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}
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}
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ad->ad_xkey = auth->ah_key;
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pkey.n_bytes = (char *)(ad->ad_pkey);
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pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1;
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if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) {
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syslog(LOG_INFO,
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"authdes_refresh: keyserv(1m) is unable to encrypt session key");
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return (FALSE);
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}
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cred->adc_fullname.key = ad->ad_xkey;
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cred->adc_namekind = ADN_FULLNAME;
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cred->adc_fullname.name = ad->ad_fullname;
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return (TRUE);
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}
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/*
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* 5. Destroy
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*/
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static void
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authdes_destroy(AUTH *auth)
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{
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/* LINTED pointer alignment */
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struct ad_private *ad = AUTH_PRIVATE(auth);
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FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
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FREE(ad->ad_servername, ad->ad_servernamelen + 1);
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if (ad->ad_timehost)
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FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
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if (ad->ad_netid)
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FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
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if (ad->ad_uaddr)
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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);
|
|
}
|