auth_unix.c
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上传日期:2007-01-17
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文件大小:9k
- /* auth_unix.c - implements UNIX style authentication parameters */
- /* Copyright 1984-2000 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- * Copyright (c) 1987 Wind River Systems, Inc.
- * Copyright (C) 1984, Sun Microsystems, Inc.
- *
- * 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
- */
- /*
- modification history
- --------------------
- 01q,23oct01,rae fixed SPR #71008
- 01p,18apr00,ham fixed compilation warnings.
- 01o,26may92,rrr the tree shuffle
- 01n,04oct91,rrr passed through the ansification filter
- -changed includes to have absolute path from h/
- -fixed #else and #endif
- -changed copyright notice
- 01m,25oct90,dnw removed include of utime.h.
- 01l,15jul90,dnw coerced mem_alloc() to (char*) where necessary
- 01k,11may90,yao added missing modification history (01i) for the last checkin.
- 01i,09may90,yao deleted declaration of malloc.
- 01h,19apr90,hjb de-linted.
- 01g,27oct89,hjb upgraded to 4.0
- 01f,04jun88,llk got rid of "bizarre behavior" message in _create and _refresh.
- 01e,05apr88,gae changed fprintf() to printErr().
- 01d,04jan88,rdc kludged the date in authunix_create for nfs.
- 01c,11nov87,jlf added wrs copyright, title, mod history, etc.
- 01b,06nov87,dnw changed conditionals on KERNEL to DONT_PRINT_ERRORS.
- 01a,01nov87,rdc first VxWorks version
- */
- /*
- * auth_unix.c, Implements UNIX style authentication parameters.
- *
- * The system is very weak. The client uses no encryption for it's
- * credentials and only sends null verifiers. The server sends backs
- * null verifiers or optionally a verifier that suggests a new short hand
- * for the credentials.
- *
- */
- #include "rpc/rpctypes.h"
- #include "rpc/xdr.h"
- #include "rpc/auth.h"
- #include "rpc/auth_unix.h"
- #include "vxWorks.h"
- #include "memLib.h"
- #include "stdio.h"
- #include "stdlib.h"
- #include "string.h"
- IMPORT bool_t xdr_opaque_auth ();
- /*
- * Unix authenticator operations vector
- */
- LOCAL void authunix_nextverf(); /* 4.0 */
- LOCAL bool_t authunix_marshal(); /* 4.0 */
- LOCAL bool_t authunix_validate(); /* 4.0 */
- LOCAL bool_t authunix_refresh(); /* 4.0 */
- LOCAL void authunix_destroy(); /* 4.0 */
- static struct auth_ops auth_unix_ops = {
- authunix_nextverf,
- authunix_marshal,
- authunix_validate,
- authunix_refresh,
- authunix_destroy
- };
- /*
- * This struct is pointed to by the ah_private field of an auth_handle.
- */
- struct audata {
- struct opaque_auth au_origcred; /* original credentials */
- struct opaque_auth au_shcred; /* short hand cred */
- u_long au_shfaults; /* short hand cache faults */
- char au_marshed[MAX_AUTH_BYTES];
- u_int au_mpos; /* xdr pos at end of marshed */
- };
- #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
- LOCAL void marshal_new_auth(); /* 4.0 */
- /*
- * Create a unix style authenticator.
- * Returns an auth handle with the given stuff in it.
- */
- AUTH *
- authunix_create(machname, uid, gid, len, aup_gids)
- char *machname;
- int uid;
- int gid;
- register int len;
- int *aup_gids;
- {
- struct authunix_parms aup;
- char mymem[MAX_AUTH_BYTES];
- /*struct timeval now;*/
- XDR xdrs;
- register AUTH *auth;
- register struct audata *au;
- /*
- * Allocate and set up auth handle
- */
- auth = (AUTH *)mem_alloc(sizeof(*auth));
- #ifndef DONT_PRINT_ERRORS
- if (auth == NULL) {
- printErr ("authunix_create: out of memoryn");
- return (NULL);
- }
- #endif
- au = (struct audata *)mem_alloc(sizeof(*au));
- #ifndef DONT_PRINT_ERRORS
- if (au == NULL) {
- printErr ("authunix_create: out of memoryn");
- return (NULL);
- }
- #endif
- auth->ah_ops = &auth_unix_ops;
- auth->ah_private = (caddr_t)au;
- auth->ah_verf = au->au_shcred = _null_auth;
- au->au_shfaults = 0;
- /*
- * fill in param struct from the given params
- */
- /* WARNING: gettimeofday unimplemented - be wary of bizarre behavior. */
- /* XXX (void)gettimeofday(&now, (struct timezone *)0); */
- /* XXX aup.aup_time = now.tv_sec; */
- aup.aup_time = 10000;
- aup.aup_machname = machname;
- aup.aup_uid = uid;
- aup.aup_gid = gid;
- aup.aup_len = (u_int)len;
- aup.aup_gids = aup_gids;
- /*
- * Serialize the parameters into origcred
- */
- xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
- if (! xdr_authunix_parms(&xdrs, &aup))
- abort();
- au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
- au->au_origcred.oa_flavor = AUTH_UNIX;
- #ifdef DONT_PRINT_ERRORS
- au->au_origcred.oa_base = (char *) mem_alloc(len);
- #else
- if ((au->au_origcred.oa_base = (char *) mem_alloc((unsigned) len)) ==
- NULL) {
- printErr ("authunix_create: out of memoryn");
- return (NULL);
- }
- #endif
- bcopy(mymem, au->au_origcred.oa_base, len);
- /*
- * set auth handle to reflect new cred.
- */
- auth->ah_cred = au->au_origcred;
- marshal_new_auth(auth);
- return (auth);
- }
- /* XXX We're not going to support this - it's too hard. */
- #if FALSE
- /*
- * Returns an auth handle with parameters determined by doing lots of
- * syscalls.
- */
- AUTH *
- authunix_create_default()
- {
- register int len;
- char machname[MAX_MACHINE_NAME + 1];
- register int uid;
- register int gid;
- int gids[NGRPS];
- if (gethostname(machname, MAX_MACHINE_NAME) == -1)
- abort();
- machname[MAX_MACHINE_NAME] = 0;
- uid = geteuid();
- gid = getegid();
- if ((len = getgroups(NGRPS, gids)) < 0)
- abort();
- return (authunix_create(machname, uid, gid, len, gids));
- }
- #endif /* FALSE */
- /*
- * authunix operations
- */
- /* ARGSUSED0 */
- LOCAL void /* 4.0 */
- authunix_nextverf(auth)
- AUTH *auth;
- {
- /* no action necessary */
- }
- LOCAL bool_t /* 4.0 */
- authunix_marshal(auth, xdrs)
- AUTH *auth;
- XDR *xdrs;
- {
- register struct audata *au = AUTH_PRIVATE(auth);
- return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
- }
- LOCAL bool_t /* 4.0 */
- authunix_validate(auth, verf)
- register AUTH *auth;
- struct opaque_auth *verf;
- {
- register struct audata *au;
- XDR xdrs;
- if (verf->oa_flavor == AUTH_SHORT) {
- au = AUTH_PRIVATE(auth);
- xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, XDR_DECODE);
- if (au->au_shcred.oa_base != NULL) {
- mem_free(au->au_shcred.oa_base,
- au->au_shcred.oa_length);
- au->au_shcred.oa_base = NULL;
- }
- if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
- auth->ah_cred = au->au_shcred;
- } else {
- xdrs.x_op = XDR_FREE;
- (void)xdr_opaque_auth(&xdrs, &au->au_shcred);
- au->au_shcred.oa_base = NULL;
- auth->ah_cred = au->au_origcred;
- }
- marshal_new_auth(auth);
- }
- return (TRUE);
- }
- LOCAL bool_t /* 4.0 */
- authunix_refresh(auth)
- register AUTH *auth;
- {
- register struct audata *au = AUTH_PRIVATE(auth);
- struct authunix_parms aup;
- struct timeval now;
- XDR xdrs;
- register int stat;
- if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
- /* there is no hope. Punt */
- return (FALSE);
- }
- au->au_shfaults ++;
- /* first deserialize the creds back into a struct authunix_parms */
- aup.aup_machname = NULL;
- aup.aup_gids = (int *)NULL;
- xdrmem_create(&xdrs, au->au_origcred.oa_base,
- au->au_origcred.oa_length, XDR_DECODE);
- stat = xdr_authunix_parms(&xdrs, &aup);
- if (! stat)
- goto done;
- /* update the time and serialize in place */
- /* WARNING: gettimeofday unimplemented - be wary of bizarre behavior. */
- /* XXX (void)gettimeofday(&now, (struct timezone *)0); */
- aup.aup_time = now.tv_sec;
- xdrs.x_op = XDR_ENCODE;
- XDR_SETPOS(&xdrs, 0);
- stat = xdr_authunix_parms(&xdrs, &aup);
- if (! stat)
- goto done;
- auth->ah_cred = au->au_origcred;
- marshal_new_auth(auth);
- done:
- /* free the struct authunix_parms created by deserializing */
- xdrs.x_op = XDR_FREE;
- (void)xdr_authunix_parms(&xdrs, &aup);
- XDR_DESTROY(&xdrs);
- return (stat);
- }
- LOCAL void /* 4.0 */
- authunix_destroy(auth)
- register AUTH *auth;
- {
- register struct audata *au = AUTH_PRIVATE(auth);
- mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
- if (au->au_shcred.oa_base != NULL)
- mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
- mem_free(auth->ah_private, sizeof(struct audata));
- if (auth->ah_verf.oa_base != NULL)
- mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
- mem_free((caddr_t)auth, sizeof(*auth));
- }
- /*
- * Marshals (pre-serializes) an auth struct.
- * sets private data, au_marshed and au_mpos
- */
- LOCAL void /* 4.0 */
- marshal_new_auth(auth)
- register AUTH *auth;
- {
- XDR xdr_stream;
- register XDR *xdrs = &xdr_stream;
- register struct audata *au = AUTH_PRIVATE(auth);
- xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
- if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
- (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) {
- perror("auth_none.c - Fatal marshalling problem");
- } else {
- au->au_mpos = XDR_GETPOS(xdrs);
- }
- XDR_DESTROY(xdrs);
- }