#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 /* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 */ /* * Copyright (c) 1988 by Sun Microsystems, Inc. */ /* * auth_des.c, client-side implementation of DES authentication */ #include <string.h> #include <rpc/des_crypt.h> #include <rpc/types.h> #include <rpc/auth.h> #include <rpc/auth_des.h> #include <rpc/xdr.h> #include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */ #include <sys/socket.h> #define MILLION 1000000L #define RTIME_TIMEOUT 5 /* seconds to wait for sync */ #define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private #define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type)) #define FREE(ptr, size) mem_free((char *)(ptr), (int) size) #define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE) #define debug(msg) /* printf("%s\n", msg) */ extern int rtime (struct sockaddr_in *, struct timeval *, struct timeval *); extern bool_t xdr_authdes_cred (XDR *, struct authdes_cred *); extern bool_t xdr_authdes_verf (XDR *, struct authdes_verf *); /* * DES authenticator operations vector */ AUTH *authdes_create (const char *, u_int, struct sockaddr *, des_block *); AUTH *authdes_pk_create (const char *, netobj *, u_int, struct sockaddr *, des_block *); static void authdes_nextverf (AUTH *); static bool_t authdes_marshal (AUTH *, XDR *); static bool_t authdes_validate (AUTH *, struct opaque_auth *); static bool_t authdes_refresh (AUTH *); static void authdes_destroy (AUTH *); static bool_t synchronize (struct sockaddr *, struct timeval *) internal_function; static struct auth_ops authdes_ops = { authdes_nextverf, authdes_marshal, authdes_validate, authdes_refresh, authdes_destroy }; /* * This struct is pointed to by the ah_private field of an "AUTH *" */ struct ad_private { char *ad_fullname; /* client's full name */ u_int ad_fullnamelen; /* length of name, rounded up */ char *ad_servername; /* server's full name */ u_int ad_servernamelen; /* length of name, rounded up */ u_int ad_window; /* client specified window */ bool_t ad_dosync; /* synchronize? */ struct sockaddr ad_syncaddr; /* remote host to synch with */ struct timeval ad_timediff; /* server's time - client's time */ u_long ad_nickname; /* server's nickname for client */ struct authdes_cred ad_cred; /* storage for credential */ struct authdes_verf ad_verf; /* storage for verifier */ struct timeval ad_timestamp; /* timestamp sent */ des_block ad_xkey; /* encrypted conversation key */ u_char ad_pkey[1024]; /* Servers actual public key */ }; /* * Create the client des authentication object */ AUTH * authdes_create (const char *servername, u_int window, struct sockaddr *syncaddr, des_block * ckey) /* servername - network name of server */ /* window - time to live */ /* syncaddr - optional addr of host to sync with */ /* ckey - optional conversation key to use */ { u_char pkey_data[1024]; netobj pkey; if (!getpublickey (servername, pkey_data)) return (NULL); pkey.n_bytes = (char *) pkey_data; pkey.n_len = strlen ((char *) pkey_data) + 1; return authdes_pk_create (servername, &pkey, window, syncaddr, ckey); } AUTH * authdes_pk_create (const char *servername, netobj * pkey, u_int window, struct sockaddr * syncaddr, des_block * ckey) { AUTH *auth; struct ad_private *ad; char namebuf[MAXNETNAMELEN + 1]; /* * Allocate everything now */ auth = ALLOC (AUTH); ad = ALLOC (struct ad_private); memset (ad, 0, sizeof (struct ad_private)); memcpy (ad->ad_pkey, pkey->n_bytes, pkey->n_len); if (!getnetname (namebuf)) goto failed; ad->ad_fullnamelen = RNDUP (strlen (namebuf)); ad->ad_fullname = mem_alloc (ad->ad_fullnamelen + 1); ad->ad_servernamelen = strlen (servername); ad->ad_servername = mem_alloc (ad->ad_servernamelen + 1); if (auth == NULL || ad == NULL || ad->ad_fullname == NULL || ad->ad_servername == NULL) { debug ("authdes_create: out of memory"); goto failed; } /* * Set up private data */ bcopy (namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1); bcopy (servername, ad->ad_servername, ad->ad_servernamelen + 1); ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0; if (syncaddr != NULL) { ad->ad_syncaddr = *syncaddr; ad->ad_dosync = TRUE; } else ad->ad_dosync = FALSE; ad->ad_window = window; if (ckey == NULL) { if (key_gendes (&auth->ah_key) < 0) { debug ("authdes_create: unable to gen conversation key"); return (NULL); } } else auth->ah_key = *ckey; /* * Set up auth handle */ auth->ah_cred.oa_flavor = AUTH_DES; auth->ah_verf.oa_flavor = AUTH_DES; auth->ah_ops = &authdes_ops; auth->ah_private = (caddr_t) ad; if (!authdes_refresh (auth)) goto failed; return (auth); failed: if (auth != NULL) FREE (auth, sizeof (AUTH)); if (ad != NULL) { if (ad->ad_fullname != NULL) FREE (ad->ad_fullname, ad->ad_fullnamelen + 1); if (ad->ad_servername != NULL) FREE (ad->ad_servername, ad->ad_servernamelen + 1); FREE (ad, sizeof (struct ad_private)); } return (NULL); } /* * Implement the five authentication operations */ /* * 1. Next Verifier */ /*ARGSUSED */ static void authdes_nextverf (AUTH * auth) { /* what the heck am I supposed to do??? */ } /* * 2. Marshal */ static bool_t authdes_marshal (AUTH * auth, XDR * xdrs) { struct ad_private *ad = AUTH_PRIVATE (auth); struct authdes_cred *cred = &ad->ad_cred; struct authdes_verf *verf = &ad->ad_verf; des_block cryptbuf[2]; des_block ivec; int status; int len; register long *ixdr; /* * Figure out the "time", accounting for any time difference * with the server if necessary. */ gettimeofday (&ad->ad_timestamp, (struct timezone *) NULL); ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec; ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec; if (ad->ad_timestamp.tv_usec >= MILLION) { ad->ad_timestamp.tv_usec -= MILLION; ad->ad_timestamp.tv_sec += 1; } /* * XDR the timestamp and possibly some other things, then * encrypt them. */ ixdr = (long *) cryptbuf; IXDR_PUT_LONG (ixdr, ad->ad_timestamp.tv_sec); IXDR_PUT_LONG (ixdr, ad->ad_timestamp.tv_usec); if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { IXDR_PUT_U_LONG (ixdr, ad->ad_window); IXDR_PUT_U_LONG (ixdr, ad->ad_window - 1); ivec.key.high = ivec.key.low = 0; status = cbc_crypt ((char *) &auth->ah_key, (char *) cryptbuf, 2 * sizeof (des_block), DES_ENCRYPT | DES_HW, (char *) &ivec); } else { status = ecb_crypt ((char *) &auth->ah_key, (char *) cryptbuf, sizeof (des_block), DES_ENCRYPT | DES_HW); } if (DES_FAILED (status)) { debug ("authdes_marshal: DES encryption failure"); return (FALSE); } ad->ad_verf.adv_xtimestamp = cryptbuf[0]; if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high; ad->ad_verf.adv_winverf = cryptbuf[1].key.low; } else { ad->ad_cred.adc_nickname = ad->ad_nickname; ad->ad_verf.adv_winverf = 0; } /* * Serialize the credential and verifier into opaque * authentication data. */ if (ad->ad_cred.adc_namekind == ADN_FULLNAME) { len = ((1 + 1 + 2 + 1) * BYTES_PER_XDR_UNIT + ad->ad_fullnamelen); } else { len = (1 + 1) * BYTES_PER_XDR_UNIT; } if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL) { IXDR_PUT_LONG (ixdr, AUTH_DES); IXDR_PUT_LONG (ixdr, len); } else { ATTEMPT (xdr_putlong (xdrs, (long *)&auth->ah_cred.oa_flavor)); ATTEMPT (xdr_putlong (xdrs, (long *)&len)); } ATTEMPT (xdr_authdes_cred (xdrs, cred)); len = (2 + 1) * BYTES_PER_XDR_UNIT; if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL) { IXDR_PUT_LONG (ixdr, AUTH_DES); IXDR_PUT_LONG (ixdr, len); } else { ATTEMPT (xdr_putlong (xdrs, (long *)&auth->ah_verf.oa_flavor)); ATTEMPT (xdr_putlong (xdrs, (long *)&len)); } ATTEMPT (xdr_authdes_verf (xdrs, verf)); return (TRUE); } /* * 3. Validate */ static bool_t authdes_validate (AUTH * auth, struct opaque_auth *rverf) { struct ad_private *ad = AUTH_PRIVATE (auth); struct authdes_verf verf; int status; register u_long *ixdr; if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) return (FALSE); ixdr = (u_long *) rverf->oa_base; verf.adv_xtimestamp.key.high = (u_long) * ixdr++; verf.adv_xtimestamp.key.low = (u_long) * ixdr++; verf.adv_int_u = (u_long) * ixdr++; /* nickname not XDR'd ! */ /* * Decrypt the timestamp */ status = ecb_crypt ((char *) &auth->ah_key, (char *) &verf.adv_xtimestamp, sizeof (des_block), DES_DECRYPT | DES_HW); if (DES_FAILED (status)) { debug ("authdes_validate: DES decryption failure"); return (FALSE); } /* * xdr the decrypted timestamp */ ixdr = (u_long *) verf.adv_xtimestamp.c; verf.adv_timestamp.tv_sec = IXDR_GET_LONG (ixdr) + 1; verf.adv_timestamp.tv_usec = IXDR_GET_LONG (ixdr); /* * validate */ if (bcmp ((char *) &ad->ad_timestamp, (char *) &verf.adv_timestamp, sizeof (struct timeval)) != 0) { debug ("authdes_validate: verifier mismatch\n"); return (FALSE); } /* * We have a nickname now, let's use it */ ad->ad_nickname = verf.adv_nickname; ad->ad_cred.adc_namekind = ADN_NICKNAME; return (TRUE); } /* * 4. Refresh */ static bool_t authdes_refresh (AUTH * auth) { netobj pkey; struct ad_private *ad = AUTH_PRIVATE (auth); struct authdes_cred *cred = &ad->ad_cred; if (ad->ad_dosync && !synchronize (&ad->ad_syncaddr, &ad->ad_timediff)) { /* * Hope the clocks are synced! */ ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0; debug ("authdes_refresh: unable to synchronize with server"); } ad->ad_xkey = auth->ah_key; pkey.n_bytes = (char *) (ad->ad_pkey); pkey.n_len = strlen ((char *) ad->ad_pkey) + 1; if (key_encryptsession_pk (ad->ad_servername, &pkey, &ad->ad_xkey) < 0) { debug ("authdes_create: unable to encrypt conversation key"); return (FALSE); } cred->adc_fullname.key = ad->ad_xkey; cred->adc_namekind = ADN_FULLNAME; cred->adc_fullname.name = ad->ad_fullname; return (TRUE); } /* * 5. Destroy */ static void authdes_destroy (AUTH * auth) { struct ad_private *ad = AUTH_PRIVATE (auth); FREE (ad->ad_fullname, ad->ad_fullnamelen + 1); FREE (ad->ad_servername, ad->ad_servernamelen + 1); FREE (ad, sizeof (struct ad_private)); FREE (auth, sizeof (AUTH)); } /* * Synchronize with the server at the given address, that is, * adjust timep to reflect the delta between our clocks */ static bool_t internal_function synchronize (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, &timeout) < 0) return (FALSE); 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); }