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/* $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ */
/*
* 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
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char *sccsid2 = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* auth_unix.c, Implements UNIX style authentication parameters.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/ucred.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/rpc_com.h>
/* auth_unix.c */
static void authunix_nextverf (AUTH *);
static bool_t authunix_marshal (AUTH *, XDR *);
static bool_t authunix_validate (AUTH *, struct opaque_auth *);
static bool_t authunix_refresh (AUTH *, void *);
static void authunix_destroy (AUTH *);
static void marshal_new_auth (AUTH *);
static struct auth_ops authunix_ops = {
.ah_nextverf = authunix_nextverf,
.ah_marshal = authunix_marshal,
.ah_validate = authunix_validate,
.ah_refresh = authunix_refresh,
.ah_destroy = 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)
/*
* Create a unix style authenticator.
* Returns an auth handle with the given stuff in it.
*/
AUTH *
authunix_create(struct ucred *cred)
{
struct xucred xcr;
char mymem[MAX_AUTH_BYTES];
XDR xdrs;
AUTH *auth;
struct audata *au;
struct timeval now;
uint32_t time;
int len;
/*
* Allocate and set up auth handle
*/
au = NULL;
auth = mem_alloc(sizeof(*auth));
#ifndef _KERNEL
if (auth == NULL) {
printf("authunix_create: out of memory");
goto cleanup_authunix_create;
}
#endif
au = mem_alloc(sizeof(*au));
#ifndef _KERNEL
if (au == NULL) {
printf("authunix_create: out of memory");
goto cleanup_authunix_create;
}
#endif
auth->ah_ops = &authunix_ops;
auth->ah_private = (caddr_t)au;
auth->ah_verf = au->au_shcred = _null_auth;
au->au_shfaults = 0;
au->au_origcred.oa_base = NULL;
getmicrotime(&now);
time = now.tv_sec;
/*
* Serialize the parameters into origcred
*/
xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
cru2x(cred, &xcr);
if (! xdr_authunix_parms(&xdrs, &time, &xcr))
panic("authunix_create: failed to encode creds");
au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
au->au_origcred.oa_flavor = AUTH_UNIX;
#ifdef _KERNEL
au->au_origcred.oa_base = mem_alloc((u_int) len);
#else
if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
printf("authunix_create: out of memory");
goto cleanup_authunix_create;
}
#endif
memcpy(au->au_origcred.oa_base, mymem, (size_t)len);
/*
* set auth handle to reflect new cred.
*/
auth->ah_cred = au->au_origcred;
marshal_new_auth(auth);
return (auth);
#ifndef _KERNEL
cleanup_authunix_create:
if (auth)
mem_free(auth, sizeof(*auth));
if (au) {
if (au->au_origcred.oa_base)
mem_free(au->au_origcred.oa_base, (u_int)len);
mem_free(au, sizeof(*au));
}
return (NULL);
#endif
}
/*
* authunix operations
*/
/* ARGSUSED */
static void
authunix_nextverf(AUTH *auth)
{
/* no action necessary */
}
static bool_t
authunix_marshal(AUTH *auth, XDR *xdrs)
{
struct audata *au;
au = AUTH_PRIVATE(auth);
return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
}
static bool_t
authunix_validate(AUTH *auth, struct opaque_auth *verf)
{
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);
}
static bool_t
authunix_refresh(AUTH *auth, void *dummy)
{
struct audata *au = AUTH_PRIVATE(auth);
struct xucred xcr;
uint32_t time;
struct timeval now;
XDR xdrs;
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 ucred */
xdrmem_create(&xdrs, au->au_origcred.oa_base,
au->au_origcred.oa_length, XDR_DECODE);
stat = xdr_authunix_parms(&xdrs, &time, &xcr);
if (! stat)
goto done;
/* update the time and serialize in place */
getmicrotime(&now);
time = now.tv_sec;
xdrs.x_op = XDR_ENCODE;
XDR_SETPOS(&xdrs, 0);
stat = xdr_authunix_parms(&xdrs, &time, &xcr);
if (! stat)
goto done;
auth->ah_cred = au->au_origcred;
marshal_new_auth(auth);
done:
XDR_DESTROY(&xdrs);
return (stat);
}
static void
authunix_destroy(AUTH *auth)
{
struct audata *au;
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(auth, sizeof(*auth));
}
/*
* Marshals (pre-serializes) an auth struct.
* sets private data, au_marshed and au_mpos
*/
static void
marshal_new_auth(AUTH *auth)
{
XDR xdr_stream;
XDR *xdrs = &xdr_stream;
struct audata *au;
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))))
printf("auth_none.c - Fatal marshalling problem");
else
au->au_mpos = XDR_GETPOS(xdrs);
XDR_DESTROY(xdrs);
}
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