469 lines
13 KiB
C
469 lines
13 KiB
C
/*
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* Copyright (c) 2010, Oracle America, Inc.
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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
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, 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
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 <stdint.h>
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#include <rpc/des_crypt.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/xdr.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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#include <time.h>
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#include <shlib-compat.h>
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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 (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 *);
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static void authdes_destroy (AUTH *);
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static bool_t synchronize (struct sockaddr *, struct rpc_timeval *);
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static const 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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/*
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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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uint32_t 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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struct rpc_timeval ad_timediff; /* server's time - client's time */
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uint32_t 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 rpc_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]; /* Servers actual public key */
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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 (const char *servername, u_int window,
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struct sockaddr *syncaddr, des_block *ckey)
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/* servername - network name of server */
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/* window - time to live */
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/* syncaddr - optional addr of host to sync with */
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/* ckey - optional conversation key to use */
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{
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char pkey_data[1024];
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netobj pkey;
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if (!getpublickey (servername, pkey_data))
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return NULL;
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pkey.n_bytes = pkey_data;
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pkey.n_len = strlen (pkey_data) + 1;
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return authdes_pk_create (servername, &pkey, window, syncaddr, ckey);
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}
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#ifdef EXPORT_RPC_SYMBOLS
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libc_hidden_def (authdes_create)
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#else
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libc_hidden_nolink_sunrpc (authdes_create, GLIBC_2_1)
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#endif
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AUTH *
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authdes_pk_create (const char *servername, netobj *pkey, u_int window,
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struct sockaddr *syncaddr, des_block *ckey)
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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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ad = ALLOC (struct ad_private);
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if (auth == NULL || ad == NULL)
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{
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debug ("authdes_create: out of memory");
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goto failed;
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}
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memset (ad, 0, sizeof (struct ad_private));
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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 (strlen (namebuf));
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ad->ad_fullname = mem_alloc (ad->ad_fullnamelen + 1);
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ad->ad_servernamelen = strlen (servername);
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ad->ad_servername = mem_alloc (ad->ad_servernamelen + 1);
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if (ad->ad_fullname == NULL || ad->ad_servername == NULL)
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{
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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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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_timediff.tv_sec = ad->ad_timediff.tv_usec = 0;
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if (syncaddr != NULL)
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{
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ad->ad_syncaddr = *syncaddr;
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ad->ad_dosync = TRUE;
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}
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else
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ad->ad_dosync = FALSE;
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ad->ad_window = window;
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if (ckey == NULL)
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{
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if (key_gendes (&auth->ah_key) < 0)
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{
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debug ("authdes_create: unable to gen conversation key");
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goto failed;
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}
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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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* 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 = (struct auth_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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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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{
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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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FREE (ad, sizeof (struct ad_private));
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}
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return NULL;
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}
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#ifdef EXPORT_RPC_SYMBOLS
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libc_hidden_def (authdes_pk_create)
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#else
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libc_hidden_nolink_sunrpc (authdes_pk_create, GLIBC_2_1)
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#endif
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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)
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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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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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register int32_t *ixdr;
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struct timespec now;
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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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__clock_gettime (CLOCK_REALTIME, &now);
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ad->ad_timestamp.tv_sec = now.tv_sec + ad->ad_timediff.tv_sec;
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ad->ad_timestamp.tv_usec = (now.tv_nsec / 1000) + ad->ad_timediff.tv_usec;
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if (ad->ad_timestamp.tv_usec >= MILLION)
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{
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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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* XXX We have a real Year 2038 problem here.
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*/
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ixdr = (int32_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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{
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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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2 * sizeof (des_block), DES_ENCRYPT | DES_HW, (char *) &ivec);
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}
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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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if (DES_FAILED (status))
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{
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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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{
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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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}
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else
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{
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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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if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL)
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{
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IXDR_PUT_INT32 (ixdr, AUTH_DES);
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IXDR_PUT_U_INT32 (ixdr, len);
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}
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else
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{
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ATTEMPT (xdr_putint32 (xdrs, &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)) != NULL)
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{
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IXDR_PUT_INT32 (ixdr, AUTH_DES);
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IXDR_PUT_U_INT32 (ixdr, len);
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}
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else
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{
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ATTEMPT (xdr_putint32 (xdrs, &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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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 uint32_t *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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ixdr = (uint32_t *) rverf->oa_base;
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verf.adv_xtimestamp.key.high = *ixdr++;
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verf.adv_xtimestamp.key.low = *ixdr++;
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verf.adv_int_u = *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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{
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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 = (uint32_t *) verf.adv_xtimestamp.c;
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verf.adv_timestamp.tv_sec = IXDR_GET_U_INT32 (ixdr) + 1;
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verf.adv_timestamp.tv_usec = IXDR_GET_U_INT32 (ixdr);
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/*
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* validate
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*/
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if (memcmp ((char *) &ad->ad_timestamp, (char *) &verf.adv_timestamp,
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sizeof (struct rpc_timeval)) != 0)
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{
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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 *auth)
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{
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netobj pkey;
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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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if (ad->ad_dosync && !synchronize (&ad->ad_syncaddr, &ad->ad_timediff))
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{
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/*
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* Hope the clocks are synced!
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*/
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ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0;
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debug ("authdes_refresh: unable to synchronize with server");
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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 = 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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{
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debug ("authdes_create: unable to encrypt conversation 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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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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FREE (ad, sizeof (struct ad_private));
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FREE (auth, sizeof (AUTH));
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}
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/*
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* Synchronize with the server at the given address, that is,
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* adjust timep to reflect the delta between our clocks
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*/
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static bool_t
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synchronize (struct sockaddr *syncaddr, struct rpc_timeval *timep)
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{
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struct timespec mytime;
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struct rpc_timeval timeout;
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long int myusec;
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timeout.tv_sec = RTIME_TIMEOUT;
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timeout.tv_usec = 0;
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if (rtime ((struct sockaddr_in *) syncaddr, timep, &timeout) < 0)
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return FALSE;
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__clock_gettime (CLOCK_REALTIME, &mytime);
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timep->tv_sec -= mytime.tv_sec;
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myusec = mytime.tv_nsec / 1000;
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if (myusec > timep->tv_usec)
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{
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timep->tv_sec -= 1;
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timep->tv_usec += MILLION;
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}
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timep->tv_usec -= myusec;
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return TRUE;
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}
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