MFC r1.28:

[dragonfly.git] / lib / libc / rpc / auth_des.c

/*
 * 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
 *
 * @(#)auth_des.c       2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI
 * $FreeBSD: src/lib/libc/rpc/auth_des.c,v 1.3 1999/08/28 00:00:32 peter Exp $
 * $DragonFly: src/lib/libc/rpc/auth_des.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
 */
/*
 * Copyright (c) 1988 by Sun Microsystems, Inc.
 */
/*
 * auth_des.c, client-side implementation of DES authentication
 */
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/cdefs.h>
#include <rpc/des_crypt.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/auth_des.h>
#include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */
#include <sys/socket.h>
#undef NIS
#include <rpcsvc/nis.h>

extern bool_t __rpc_get_time_offset ( struct timeval *, nis_server *,
                                                char *, char **, struct sockaddr_in * );
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 * );

#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) */

/* 
 * DES authenticator operations vector
 */
static void     authdes_nextverf();
static bool_t   authdes_marshal();
static bool_t   authdes_validate();
static bool_t   authdes_refresh();
static void     authdes_destroy();
static struct auth_ops authdes_ops = {
        authdes_nextverf,
        authdes_marshal,
        authdes_validate,
        authdes_refresh,
        authdes_destroy
};
#ifdef foo
static bool_t   synchronize ( struct sockaddr *, struct timeval *);
#endif
/*
 * 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 */
        char *ad_timehost;              /* 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];           /* Server's actual public key */
        char *ad_netid;                 /* Timehost netid */
        char *ad_uaddr;                 /* Timehost uaddr */
        nis_server *ad_nis_srvr;        /* NIS+ server struct */
};
        

/*
 * Create the client des authentication object
 */     
AUTH *
authdes_create(char *servername,                /* network name of server */
               u_int window,                    /* time to live */
               struct sockaddr *syncaddr,       /* optional addr of host to sync with */
               des_block *ckey)                 /* optional conversation key to use*/
{

        AUTH *auth;
        struct ad_private *ad;
        char namebuf[MAXNETNAMELEN+1];
        u_char  pkey_data[1024];

        if (!getpublickey(servername, pkey_data))
                return(NULL);

        /*
         * Allocate everything now
         */
        auth = ALLOC(AUTH);
        ad = ALLOC(struct ad_private);
        getnetname(namebuf);

        ad->ad_fullnamelen = RNDUP(strlen(namebuf));
        ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);

        ad->ad_servernamelen = strlen(servername);
        ad->ad_servername = (char *)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);
        bcopy(pkey_data, ad->ad_pkey, strlen(pkey_data) + 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);
}

/*
 * Slightly modified version of authdes_create which takes the public key
 * of the server principal as an argument. This spares us a call to
 * getpublickey() which in the nameserver context can cause a deadlock.
 */
AUTH *
authdes_pk_create(char *servername,             /* network name of server */
                  netobj *pkey,                 /* public key of server */
                  u_int window,                 /* time to live */
                  char *timehost,               /* optional hostname to sync with */
                  des_block *ckey,              /* optional conversation key to use */
                  nis_server *srvr)             /* optional NIS+ server struct */
{
        AUTH *auth;
        struct ad_private *ad;
        char namebuf[MAXNETNAMELEN+1];

        /*
         * Allocate everything now
         */
        auth = ALLOC(AUTH);
        if (auth == NULL) {
                debug("authdes_pk_create: out of memory");
                return (NULL);
        }
        ad = ALLOC(struct ad_private);
        if (ad == NULL) {
                debug("authdes_pk_create: out of memory");
                goto failed;
        }
        ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */
        ad->ad_timehost = NULL;
        ad->ad_netid = NULL;
        ad->ad_uaddr = NULL;
        ad->ad_nis_srvr = NULL;
        ad->ad_timediff.tv_sec = 0;
        ad->ad_timediff.tv_usec = 0;
        memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
        if (!getnetname(namebuf))
                goto failed;
        ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf));
        ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
        ad->ad_servernamelen = strlen(servername);
        ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);

        if (ad->ad_fullname == NULL || ad->ad_servername == NULL) {
                debug("authdes_pk_create: out of memory");
                goto failed;
        }
        if (timehost != NULL) {
                ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
                if (ad->ad_timehost == NULL) {
                        debug("authdes_pk_create: out of memory");
                        goto failed;
                }
                memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1);
                ad->ad_dosync = TRUE;
        } else if (srvr != NULL) {
                ad->ad_nis_srvr = srvr; /* transient */
                ad->ad_dosync = TRUE;
        } else {
                ad->ad_dosync = FALSE;
        }
        memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
        memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1);
        ad->ad_window = window;
        if (ckey == NULL) {
                if (key_gendes(&auth->ah_key) < 0) {
                        debug("authdes_pk_create: unable to gen conversation key");
                        goto failed;
                }
        } 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;
        }
        ad->ad_nis_srvr = NULL; /* not needed any longer */
        return (auth);

failed:
        if (auth)
                FREE(auth, sizeof (AUTH));
        if (ad) {
                if (ad->ad_fullname)
                        FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
                if (ad->ad_servername)
                        FREE(ad->ad_servername, ad->ad_servernamelen + 1);
                if (ad->ad_timehost)
                        FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
                if (ad->ad_netid)
                        free(ad->ad_netid);
                if (ad->ad_uaddr)
                        free(ad->ad_uaddr);
                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;
        long len;
        int32_t *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 = (int32_t *)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))) {
                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, &len)); 
        }
        ATTEMPT(xdr_authdes_cred(xdrs, cred));

        len = (2 + 1)*BYTES_PER_XDR_UNIT; 
        if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
                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, &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;
        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)
{
        struct ad_private *ad = AUTH_PRIVATE(auth);
        struct authdes_cred *cred = &ad->ad_cred;
        netobj          pkey;

        if (ad->ad_dosync &&
#ifdef old
                        !synchronize(&ad->ad_syncaddr, &ad->ad_timediff)) {
#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)
{
        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(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);
        }
        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