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This commit is contained in:
Roland McGrath
319
sunrpc/auth_unix.c
Normal file
319
sunrpc/auth_unix.c
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/* @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
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#endif
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/*
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* auth_unix.c, Implements UNIX style authentication parameters.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* The system is very weak. The client uses no encryption for it's
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* credentials and only sends null verifiers. The server sends backs
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* null verifiers or optionally a verifier that suggests a new short hand
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* for the credentials.
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*
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*/
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#include <stdio.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include <rpc/auth.h>
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#include <rpc/auth_unix.h>
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/*
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* Unix authenticator operations vector
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*/
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static void authunix_nextverf();
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static bool_t authunix_marshal();
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static bool_t authunix_validate();
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static bool_t authunix_refresh();
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static void authunix_destroy();
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static struct auth_ops auth_unix_ops = {
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authunix_nextverf,
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authunix_marshal,
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authunix_validate,
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authunix_refresh,
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authunix_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_handle.
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*/
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struct audata {
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struct opaque_auth au_origcred; /* original credentials */
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struct opaque_auth au_shcred; /* short hand cred */
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u_long au_shfaults; /* short hand cache faults */
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char au_marshed[MAX_AUTH_BYTES];
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u_int au_mpos; /* xdr pos at end of marshed */
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};
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#define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
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static bool_t marshal_new_auth();
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/*
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* Create a unix style authenticator.
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* Returns an auth handle with the given stuff in it.
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*/
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AUTH *
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authunix_create(machname, uid, gid, len, aup_gids)
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char *machname;
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int uid;
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int gid;
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register int len;
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int *aup_gids;
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{
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struct authunix_parms aup;
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char mymem[MAX_AUTH_BYTES];
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struct timeval now;
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XDR xdrs;
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register AUTH *auth;
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register struct audata *au;
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/*
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* Allocate and set up auth handle
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*/
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auth = (AUTH *)mem_alloc(sizeof(*auth));
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#ifndef KERNEL
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if (auth == NULL) {
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(void)fprintf(stderr, "authunix_create: out of memory\n");
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return (NULL);
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}
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#endif
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au = (struct audata *)mem_alloc(sizeof(*au));
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#ifndef KERNEL
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if (au == NULL) {
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(void)fprintf(stderr, "authunix_create: out of memory\n");
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return (NULL);
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}
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#endif
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auth->ah_ops = &auth_unix_ops;
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auth->ah_private = (caddr_t)au;
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auth->ah_verf = au->au_shcred = _null_auth;
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au->au_shfaults = 0;
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/*
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* fill in param struct from the given params
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*/
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(void)gettimeofday(&now, (struct timezone *)0);
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aup.aup_time = now.tv_sec;
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aup.aup_machname = machname;
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aup.aup_uid = uid;
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aup.aup_gid = gid;
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aup.aup_len = (u_int)len;
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aup.aup_gids = aup_gids;
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/*
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* Serialize the parameters into origcred
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*/
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xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
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if (! xdr_authunix_parms(&xdrs, &aup))
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abort();
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au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
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au->au_origcred.oa_flavor = AUTH_UNIX;
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#ifdef KERNEL
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au->au_origcred.oa_base = mem_alloc((u_int) len);
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#else
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if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
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(void)fprintf(stderr, "authunix_create: out of memory\n");
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return (NULL);
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}
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#endif
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bcopy(mymem, au->au_origcred.oa_base, (u_int)len);
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/*
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* set auth handle to reflect new cred.
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*/
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auth->ah_cred = au->au_origcred;
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marshal_new_auth(auth);
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return (auth);
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}
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/*
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* Returns an auth handle with parameters determined by doing lots of
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* syscalls.
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*/
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AUTH *
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authunix_create_default()
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{
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register int len;
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char machname[MAX_MACHINE_NAME + 1];
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register int uid;
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register int gid;
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int gids[NGRPS];
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if (gethostname(machname, MAX_MACHINE_NAME) == -1)
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abort();
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machname[MAX_MACHINE_NAME] = 0;
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uid = geteuid();
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gid = getegid();
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if ((len = getgroups(NGRPS, gids)) < 0)
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abort();
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return (authunix_create(machname, uid, gid, len, gids));
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}
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/*
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* authunix operations
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*/
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static void
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authunix_nextverf(auth)
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AUTH *auth;
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{
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/* no action necessary */
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}
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static bool_t
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authunix_marshal(auth, xdrs)
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AUTH *auth;
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XDR *xdrs;
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{
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register struct audata *au = AUTH_PRIVATE(auth);
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return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
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}
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static bool_t
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authunix_validate(auth, verf)
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register AUTH *auth;
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struct opaque_auth verf;
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{
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register struct audata *au;
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XDR xdrs;
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if (verf.oa_flavor == AUTH_SHORT) {
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au = AUTH_PRIVATE(auth);
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xdrmem_create(&xdrs, verf.oa_base, verf.oa_length, XDR_DECODE);
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if (au->au_shcred.oa_base != NULL) {
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mem_free(au->au_shcred.oa_base,
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au->au_shcred.oa_length);
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au->au_shcred.oa_base = NULL;
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}
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if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
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auth->ah_cred = au->au_shcred;
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} else {
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xdrs.x_op = XDR_FREE;
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(void)xdr_opaque_auth(&xdrs, &au->au_shcred);
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au->au_shcred.oa_base = NULL;
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auth->ah_cred = au->au_origcred;
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}
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marshal_new_auth(auth);
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}
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return (TRUE);
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}
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static bool_t
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authunix_refresh(auth)
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register AUTH *auth;
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{
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register struct audata *au = AUTH_PRIVATE(auth);
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struct authunix_parms aup;
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struct timeval now;
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XDR xdrs;
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register int stat;
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if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
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/* there is no hope. Punt */
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return (FALSE);
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}
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au->au_shfaults ++;
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/* first deserialize the creds back into a struct authunix_parms */
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aup.aup_machname = NULL;
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aup.aup_gids = (int *)NULL;
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xdrmem_create(&xdrs, au->au_origcred.oa_base,
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au->au_origcred.oa_length, XDR_DECODE);
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stat = xdr_authunix_parms(&xdrs, &aup);
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if (! stat)
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goto done;
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/* update the time and serialize in place */
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(void)gettimeofday(&now, (struct timezone *)0);
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aup.aup_time = now.tv_sec;
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xdrs.x_op = XDR_ENCODE;
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XDR_SETPOS(&xdrs, 0);
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stat = xdr_authunix_parms(&xdrs, &aup);
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if (! stat)
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goto done;
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auth->ah_cred = au->au_origcred;
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marshal_new_auth(auth);
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done:
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/* free the struct authunix_parms created by deserializing */
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xdrs.x_op = XDR_FREE;
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(void)xdr_authunix_parms(&xdrs, &aup);
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XDR_DESTROY(&xdrs);
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return (stat);
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}
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static void
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authunix_destroy(auth)
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register AUTH *auth;
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{
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register struct audata *au = AUTH_PRIVATE(auth);
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mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
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if (au->au_shcred.oa_base != NULL)
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mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
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mem_free(auth->ah_private, sizeof(struct audata));
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if (auth->ah_verf.oa_base != NULL)
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mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
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mem_free((caddr_t)auth, sizeof(*auth));
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}
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/*
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* Marshals (pre-serializes) an auth struct.
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* sets private data, au_marshed and au_mpos
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*/
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static bool_t
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marshal_new_auth(auth)
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register AUTH *auth;
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{
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XDR xdr_stream;
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register XDR *xdrs = &xdr_stream;
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register struct audata *au = AUTH_PRIVATE(auth);
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xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
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if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
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(! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) {
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perror("auth_none.c - Fatal marshalling problem");
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} else {
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au->au_mpos = XDR_GETPOS(xdrs);
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}
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XDR_DESTROY(xdrs);
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}
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