555 lines
15 KiB
C
555 lines
15 KiB
C
/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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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 <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 <rpc/types.h>
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#include <rpc/xdr.h>
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#include <rpc/auth.h>
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#include <rpc/auth_des.h>
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#include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */
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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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#if defined(LIBC_SCCS) && !defined(lint)
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/* from: 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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static const char rcsid[] = "$FreeBSD$";
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#endif
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extern bool_t __rpc_get_time_offset __P(( struct timeval *, nis_server *,
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char *, char **, struct sockaddr_in * ));
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extern int rtime __P(( struct sockaddr_in *, struct timeval *, struct timeval *));
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extern bool_t xdr_authdes_cred __P(( XDR *, struct authdes_cred * ));
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extern bool_t xdr_authdes_verf __P(( XDR *, struct authdes_verf * ));
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#define MILLION 1000000L
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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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#define debug(msg) /*printf("%s\n", msg) */
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/*
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* DES authenticator operations vector
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*/
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static void authdes_nextverf();
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static bool_t authdes_marshal();
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static bool_t authdes_validate();
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static bool_t authdes_refresh();
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static void authdes_destroy();
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static struct auth_ops authdes_ops = {
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authdes_nextverf,
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authdes_marshal,
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authdes_validate,
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authdes_refresh,
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authdes_destroy
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};
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#ifdef foo
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static bool_t synchronize __P(( struct sockaddr *, struct timeval *));
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#endif
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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 sockaddr 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_long 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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/*
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* Create the client des authentication object
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*/
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AUTH *
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authdes_create(servername, window, syncaddr, ckey)
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char *servername; /* network name of server */
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u_int window; /* time to live */
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struct sockaddr *syncaddr; /* optional addr of host to sync with */
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des_block *ckey; /* optional conversation key to use*/
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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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u_char pkey_data[1024];
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if (!getpublickey(servername, pkey_data))
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return(NULL);
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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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ad = ALLOC(struct ad_private);
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(void) getnetname(namebuf);
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ad->ad_fullnamelen = RNDUP(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 (auth == NULL || ad == NULL || ad->ad_fullname == NULL ||
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ad->ad_servername == NULL) {
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debug("authdes_create: out of memory");
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goto failed;
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}
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/*
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* Set up private data
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*/
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bcopy(namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1);
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bcopy(servername, ad->ad_servername, ad->ad_servernamelen + 1);
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bcopy(pkey_data, ad->ad_pkey, strlen(pkey_data) + 1);
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if (syncaddr != NULL) {
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ad->ad_syncaddr = *syncaddr;
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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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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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debug("authdes_create: unable to gen conversation key");
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return (NULL);
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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)) {
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goto failed;
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}
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return (auth);
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failed:
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if (auth != NULL)
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FREE(auth, sizeof(AUTH));
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if (ad != NULL)
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FREE(ad, sizeof(struct ad_private));
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if (ad->ad_fullname != NULL)
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FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
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if (ad->ad_servername != NULL)
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FREE(ad->ad_servername, ad->ad_servernamelen + 1);
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return (NULL);
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}
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/*
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* Slightly modified version of authdes_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_create(servername, pkey, window, timehost, ckey, srvr)
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char *servername; /* network name of server */
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netobj *pkey; /* public key of server */
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u_int window; /* time to live */
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char *timehost; /* optional hostname to sync with */
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des_block *ckey; /* optional conversation key to use */
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nis_server *srvr; /* optional NIS+ server struct */
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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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debug("authdes_pk_create: 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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debug("authdes_pk_create: 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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debug("authdes_pk_create: 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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debug("authdes_pk_create: 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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debug("authdes_pk_create: unable to gen conversation 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)) {
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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);
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if (ad->ad_uaddr)
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free(ad->ad_uaddr);
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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)
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AUTH *auth;
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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, xdrs)
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AUTH *auth;
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XDR *xdrs;
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{
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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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long len;
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int32_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, (struct timezone *)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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if (ad->ad_timestamp.tv_usec >= MILLION) {
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ad->ad_timestamp.tv_usec -= MILLION;
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ad->ad_timestamp.tv_sec += 1;
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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 = (int32_t *)cryptbuf;
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IXDR_PUT_LONG(ixdr, ad->ad_timestamp.tv_sec);
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IXDR_PUT_LONG(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_LONG(ixdr, ad->ad_window);
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IXDR_PUT_U_LONG(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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2*sizeof(des_block), 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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sizeof(des_block), DES_ENCRYPT | DES_HW);
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}
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if (DES_FAILED(status)) {
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debug("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_LONG(ixdr, AUTH_DES);
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IXDR_PUT_LONG(ixdr, len);
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} else {
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ATTEMPT(xdr_putlong(xdrs, (long *)&auth->ah_cred.oa_flavor));
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ATTEMPT(xdr_putlong(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_LONG(ixdr, AUTH_DES);
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IXDR_PUT_LONG(ixdr, len);
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} else {
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ATTEMPT(xdr_putlong(xdrs, (long *)&auth->ah_verf.oa_flavor));
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ATTEMPT(xdr_putlong(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, rverf)
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AUTH *auth;
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struct opaque_auth *rverf;
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{
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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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register u_long *ixdr;
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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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ixdr = (u_long *)rverf->oa_base;
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verf.adv_xtimestamp.key.high = (u_long)*ixdr++;
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verf.adv_xtimestamp.key.low = (u_long)*ixdr++;
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verf.adv_int_u = (u_long)*ixdr++; /* nickname not XDR'd ! */
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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 *)&verf.adv_xtimestamp,
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sizeof(des_block), DES_DECRYPT | DES_HW);
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if (DES_FAILED(status)) {
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debug("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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ixdr = (u_long *)verf.adv_xtimestamp.c;
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verf.adv_timestamp.tv_sec = IXDR_GET_LONG(ixdr) + 1;
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verf.adv_timestamp.tv_usec = IXDR_GET_LONG(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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debug("authdes_validate: verifier mismatch\n");
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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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static bool_t
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authdes_refresh(auth)
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AUTH *auth;
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{
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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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netobj pkey;
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if (ad->ad_dosync &&
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#ifdef old
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!synchronize(&ad->ad_syncaddr, &ad->ad_timediff)) {
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#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 *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 += MILLION;
|
|
}
|
|
timep->tv_usec -= mytime.tv_usec;
|
|
return (TRUE);
|
|
}
|
|
#endif
|