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Annotation of 43BSDReno/lib/librpc/auth_unix.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
        !             3:  * unrestricted use provided that this legend is included on all tape
        !             4:  * media and as a part of the software program in whole or part.  Users
        !             5:  * may copy or modify Sun RPC without charge, but are not authorized
        !             6:  * to license or distribute it to anyone else except as part of a product or
        !             7:  * program developed by the user.
        !             8:  * 
        !             9:  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
        !            10:  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
        !            11:  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
        !            12:  * 
        !            13:  * Sun RPC is provided with no support and without any obligation on the
        !            14:  * part of Sun Microsystems, Inc. to assist in its use, correction,
        !            15:  * modification or enhancement.
        !            16:  * 
        !            17:  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
        !            18:  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
        !            19:  * OR ANY PART THEREOF.
        !            20:  * 
        !            21:  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
        !            22:  * or profits or other special, indirect and consequential damages, even if
        !            23:  * Sun has been advised of the possibility of such damages.
        !            24:  * 
        !            25:  * Sun Microsystems, Inc.
        !            26:  * 2550 Garcia Avenue
        !            27:  * Mountain View, California  94043
        !            28:  */
        !            29: #ifndef lint
        !            30: static char sccsid[] = "@(#)auth_unix.c 1.5 85/03/17 Copyr 1984 Sun Micro";
        !            31: #endif
        !            32: 
        !            33: /*
        !            34:  * auth_unix.c, Implements UNIX style authentication parameters. 
        !            35:  *  
        !            36:  * Copyright (C) 1984, Sun Microsystems, Inc. 
        !            37:  *
        !            38:  * The system is very weak.  The client uses no encryption for it's
        !            39:  * credentials and only sends null verifiers.  The server sends backs
        !            40:  * null verifiers or optionally a verifier that suggests a new short hand
        !            41:  * for the credentials.
        !            42:  *
        !            43:  */
        !            44: 
        !            45: #include <stdio.h>
        !            46: #include "types.h"
        !            47: #include <sys/time.h>
        !            48: #include "xdr.h"
        !            49: #include "auth.h"
        !            50: #include "auth_unix.h"
        !            51: char *malloc();
        !            52: 
        !            53: /*
        !            54:  * Unix authenticator operations vector
        !            55:  */
        !            56: static void    authunix_nextverf();
        !            57: static bool_t  authunix_marshal();
        !            58: static bool_t  authunix_validate();
        !            59: static bool_t  authunix_refresh();
        !            60: static void    authunix_destroy();
        !            61: 
        !            62: static struct auth_ops auth_unix_ops = {
        !            63:        authunix_nextverf,
        !            64:        authunix_marshal,
        !            65:        authunix_validate,
        !            66:        authunix_refresh,
        !            67:        authunix_destroy
        !            68: };
        !            69: 
        !            70: /*
        !            71:  * This struct is pointed to by the ah_private field of an auth_handle.
        !            72:  */
        !            73: struct audata {
        !            74:        struct opaque_auth      au_origcred;    /* original credentials */
        !            75:        struct opaque_auth      au_shcred;      /* short hand cred */
        !            76:        u_long                  au_shfaults;    /* short hand cache faults */
        !            77:        char                    au_marshed[MAX_AUTH_BYTES];
        !            78:        u_int                   au_mpos;        /* xdr pos at end of marshed */
        !            79: };
        !            80: #define        AUTH_PRIVATE(auth)      ((struct audata *)auth->ah_private)
        !            81: 
        !            82: static bool_t marshal_new_auth();
        !            83: 
        !            84: 
        !            85: /*
        !            86:  * Create a unix style authenticator.
        !            87:  * Returns an auth handle with the given stuff in it.
        !            88:  */
        !            89: AUTH *
        !            90: authunix_create(machname, uid, gid, len, aup_gids)
        !            91:        char *machname;
        !            92:        int uid;
        !            93:        int gid;
        !            94:        register int len;
        !            95:        int *aup_gids;
        !            96: {
        !            97:        struct authunix_parms aup;
        !            98:        char mymem[MAX_AUTH_BYTES];
        !            99:        struct timeval now;
        !           100:        XDR xdrs;
        !           101:        register AUTH *auth;
        !           102:        register struct audata *au;
        !           103: 
        !           104:        /*
        !           105:         * Allocate and set up auth handle
        !           106:         */
        !           107:        auth = (AUTH *)mem_alloc(sizeof(*auth));
        !           108:        if (auth == NULL) {
        !           109:                fprintf(stderr, "authunix_create: out of memory\n");
        !           110:                return (NULL);
        !           111:        }
        !           112:        au = (struct audata *)mem_alloc(sizeof(*au));
        !           113:        if (au == NULL) {
        !           114:                fprintf(stderr, "authunix_create: out of memory\n");
        !           115:                return (NULL);
        !           116:        }
        !           117:        auth->ah_ops = &auth_unix_ops;
        !           118:        auth->ah_private = (caddr_t)au;
        !           119:        auth->ah_verf = au->au_shcred = _null_auth;
        !           120:        au->au_shfaults = 0;
        !           121: 
        !           122:        /*
        !           123:         * fill in param struct from the given params
        !           124:         */
        !           125:        (void)gettimeofday(&now,  (struct timezone *)0);
        !           126:        aup.aup_time = now.tv_sec;
        !           127:        aup.aup_machname = machname;
        !           128:        aup.aup_uid = uid;
        !           129:        aup.aup_gid = gid;
        !           130:        aup.aup_len = (u_int)len;
        !           131:        aup.aup_gids = aup_gids;
        !           132: 
        !           133:        /*
        !           134:         * Serialize the parameters into origcred
        !           135:         */
        !           136:        xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
        !           137:        if (! xdr_authunix_parms(&xdrs, &aup)) 
        !           138:                abort();
        !           139:        au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
        !           140:        au->au_origcred.oa_flavor = AUTH_UNIX;
        !           141:        if ((au->au_origcred.oa_base = mem_alloc(len)) == NULL) {
        !           142:                fprintf(stderr, "authunix_create: out of memory\n");
        !           143:                return (NULL);
        !           144:        }
        !           145:        bcopy(mymem, au->au_origcred.oa_base, (u_int)len);
        !           146: 
        !           147:        /*
        !           148:         * set auth handle to reflect new cred.
        !           149:         */
        !           150:        auth->ah_cred = au->au_origcred;
        !           151:        marshal_new_auth(auth);
        !           152:        return (auth);
        !           153: }
        !           154: 
        !           155: /*
        !           156:  * Returns an auth handle with parameters determined by doing lots of
        !           157:  * syscalls.
        !           158:  */
        !           159: AUTH *
        !           160: authunix_create_default()
        !           161: {
        !           162:        register int len;
        !           163:        char machname[MAX_MACHINE_NAME + 1];
        !           164:        register int uid;
        !           165:        register int gid;
        !           166:        int gids[NGRPS];
        !           167: 
        !           168:        if (gethostname(machname, MAX_MACHINE_NAME) == -1)
        !           169:                abort();
        !           170:        machname[MAX_MACHINE_NAME] = 0;
        !           171:        uid = geteuid();
        !           172:        gid = getegid();
        !           173:        if ((len = getgroups(NGRPS, gids)) < 0)
        !           174:                abort();
        !           175:        return (authunix_create(machname, uid, gid, len, gids));
        !           176: }
        !           177: 
        !           178: /*
        !           179:  * authunix operations
        !           180:  */
        !           181: 
        !           182: static void
        !           183: authunix_nextverf(auth)
        !           184:        AUTH *auth;
        !           185: {
        !           186:        /* no action necessary */
        !           187: }
        !           188: 
        !           189: static bool_t
        !           190: authunix_marshal(auth, xdrs)
        !           191:        AUTH *auth;
        !           192:        XDR *xdrs;
        !           193: {
        !           194:        register struct audata *au = AUTH_PRIVATE(auth);
        !           195: 
        !           196:        return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
        !           197: }
        !           198: 
        !           199: static bool_t
        !           200: authunix_validate(auth, verf)
        !           201:        register AUTH *auth;
        !           202:        struct opaque_auth verf;
        !           203: {
        !           204:        register struct audata *au;
        !           205:        XDR xdrs;
        !           206: 
        !           207:        if (verf.oa_flavor == AUTH_SHORT) {
        !           208:                au = AUTH_PRIVATE(auth);
        !           209:                xdrmem_create(&xdrs, verf.oa_base, verf.oa_length, XDR_DECODE);
        !           210: 
        !           211:                if (au->au_shcred.oa_base != NULL) {
        !           212:                        mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
        !           213:                        au->au_shcred.oa_base = NULL;
        !           214:                }
        !           215:                if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
        !           216:                        auth->ah_cred = au->au_shcred;
        !           217:                } else {
        !           218:                        xdrs.x_op = XDR_FREE;
        !           219:                        (void)xdr_opaque_auth(&xdrs, &au->au_shcred);
        !           220:                        au->au_shcred.oa_base = NULL;
        !           221:                        auth->ah_cred = au->au_origcred;
        !           222:                }
        !           223:                marshal_new_auth(auth);
        !           224:        }
        !           225:        return (TRUE);
        !           226: }
        !           227: 
        !           228: static bool_t
        !           229: authunix_refresh(auth)
        !           230:        register AUTH *auth;
        !           231: {
        !           232:        register struct audata *au = AUTH_PRIVATE(auth);
        !           233:        struct authunix_parms aup;
        !           234:        struct timeval now;
        !           235:        XDR xdrs;
        !           236:        register int stat;
        !           237: 
        !           238:        if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
        !           239:                /* there is no hope.  Punt */
        !           240:                return (FALSE);
        !           241:        }
        !           242:        au->au_shfaults ++;
        !           243: 
        !           244:        /* first deserialize the creds back into a struct authunix_parms */
        !           245:        aup.aup_machname = NULL;
        !           246:        aup.aup_gids = (int *)NULL;
        !           247:        xdrmem_create(&xdrs, au->au_origcred.oa_base,
        !           248:            au->au_origcred.oa_length, XDR_DECODE);
        !           249:        stat = xdr_authunix_parms(&xdrs, &aup);
        !           250:        if (! stat) 
        !           251:                goto done;
        !           252: 
        !           253:        /* update the time and serialize in place */
        !           254:        (void)gettimeofday(&now, (struct timezone *)0);
        !           255:        aup.aup_time = now.tv_sec;
        !           256:        xdrs.x_op = XDR_ENCODE;
        !           257:        XDR_SETPOS(&xdrs, 0);
        !           258:        stat = xdr_authunix_parms(&xdrs, &aup);
        !           259:        if (! stat)
        !           260:                goto done;
        !           261:        auth->ah_cred = au->au_origcred;
        !           262:        marshal_new_auth(auth);
        !           263: done:
        !           264:        /* free the struct authunix_parms created by deserializing */
        !           265:        xdrs.x_op = XDR_FREE;
        !           266:        (void)xdr_authunix_parms(&xdrs, &aup);
        !           267:        XDR_DESTROY(&xdrs);
        !           268:        return (stat);
        !           269: }
        !           270: 
        !           271: static void
        !           272: authunix_destroy(auth)
        !           273:        register AUTH *auth;
        !           274: {
        !           275:        register struct audata *au = AUTH_PRIVATE(auth);
        !           276: 
        !           277:        mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
        !           278: 
        !           279:        if (au->au_shcred.oa_base != NULL)
        !           280:                mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
        !           281: 
        !           282:        mem_free(auth->ah_private, sizeof(struct audata));
        !           283: 
        !           284:        if (auth->ah_verf.oa_base != NULL)
        !           285:                mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
        !           286: 
        !           287:        mem_free((caddr_t)auth, sizeof(*auth));
        !           288: 
        !           289: }
        !           290: 
        !           291: /*
        !           292:  * Marshals (pre-serializes) an auth struct.
        !           293:  * sets private data, au_marshed and au_mpos
        !           294:  */
        !           295: static bool_t
        !           296: marshal_new_auth(auth)
        !           297:        register AUTH *auth;
        !           298: {
        !           299:        XDR             xdr_stream;
        !           300:        register XDR    *xdrs = &xdr_stream;
        !           301:        register struct audata *au = AUTH_PRIVATE(auth);
        !           302: 
        !           303:        xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
        !           304:        if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
        !           305:            (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) {
        !           306:        } else {
        !           307:                au->au_mpos = XDR_GETPOS(xdrs);
        !           308:        }
        !           309:        XDR_DESTROY(xdrs);
        !           310: }

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