diff options
Diffstat (limited to 'sunrpc/auth_des.c')
| -rw-r--r-- | sunrpc/auth_des.c | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/sunrpc/auth_des.c b/sunrpc/auth_des.c new file mode 100644 index 0000000000..4ea6391c6e --- /dev/null +++ b/sunrpc/auth_des.c @@ -0,0 +1,459 @@ +#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 *); + +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); + 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); + 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) + FREE (ad, sizeof (struct ad_private)); + 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); + 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 +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); +} |