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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
/*
* auth_kern.c, implements UNIX style authentication parameters in the kernel.
* Interfaces with svc_auth_unix on the server. See auth_unix.c for the user
* level implementation of unix auth.
*
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/cred.h>
#include <sys/kmem.h>
#include <sys/sysmacros.h>
#include <sys/cmn_err.h>
#include <sys/utsname.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/auth_unix.h>
#include <rpc/clnt.h>
#include <rpc/rpc_msg.h>
/*
* Unix authenticator operations vector
*/
static void authkern_nextverf(AUTH *);
static bool_t authkern_marshal(AUTH *, XDR *, struct cred *);
static bool_t authkern_validate(AUTH *, struct opaque_auth *);
static bool_t authkern_refresh(AUTH *, struct rpc_msg *, cred_t *);
static void authkern_destroy(AUTH *);
static struct auth_ops auth_kern_ops = {
authkern_nextverf,
authkern_marshal,
authkern_validate,
authkern_refresh,
authkern_destroy,
authany_wrap,
authany_unwrap
};
/*
* Create a kernel unix style authenticator.
* Returns an auth handle.
*/
AUTH *
authkern_create(void)
{
/*
* Allocate and set up auth handle
*/
return (kmem_cache_alloc(authkern_cache, KM_SLEEP));
}
/*
* The constructor of the authkern_cache.
*/
/* ARGSUSED */
int
authkern_init(void *buf, void *cdrarg, int kmflags)
{
AUTH *auth = (AUTH *)buf;
auth->ah_ops = &auth_kern_ops;
auth->ah_cred.oa_flavor = AUTH_UNIX;
auth->ah_verf = _null_auth;
return (0);
}
/*
* authkern operations
*/
/* ARGSUSED */
static void
authkern_nextverf(AUTH *auth)
{
/* no action necessary */
}
static bool_t
authkern_marshal(AUTH *auth, XDR *xdrs, struct cred *cr)
{
char *sercred;
XDR xdrm;
bool_t ret;
uint32_t gidlen, credsize, namelen, rounded_namelen;
int32_t *ptr;
char *nodename = uts_nodename();
uint_t startpos;
ASSERT(xdrs->x_op == XDR_ENCODE);
ASSERT(auth->ah_cred.oa_flavor == AUTH_SYS);
ASSERT(auth->ah_verf.oa_flavor == AUTH_NONE);
ASSERT(auth->ah_verf.oa_length == 0);
/*
* First we try a fast path to get through
* this very common operation.
*/
namelen = (uint32_t)strlen(nodename);
if (namelen > MAX_MACHINE_NAME)
return (FALSE);
rounded_namelen = RNDUP(namelen);
/*
* NFIELDS is a number of the following fields we are going to encode:
* - stamp
* - strlen(machinename)
* - uid
* - gid
* - the number of gids
*/
#define NFIELDS 5
CTASSERT((NFIELDS + NGRPS) * BYTES_PER_XDR_UNIT +
RNDUP(MAX_MACHINE_NAME) <= MAX_AUTH_BYTES);
gidlen = crgetngroups(cr);
if (gidlen > NGRPS)
gidlen = NGRPS;
credsize = NFIELDS * BYTES_PER_XDR_UNIT + rounded_namelen +
gidlen * BYTES_PER_XDR_UNIT;
ASSERT(credsize <= MAX_AUTH_BYTES);
#undef NFIELDS
/*
* We need to marshal both cred and verf parts of the rpc_msg body
* (call_body). For the cred part we need to inline the auth_flavor
* and the opaque auth body size. Then we inline the credsize bytes of
* the opaque auth body for the cred part. Finally we add the
* AUTH_NONE verifier (its auth_flavor and the opaque auth body size).
*/
ptr = XDR_INLINE(xdrs, 2 * BYTES_PER_XDR_UNIT + credsize +
2 * BYTES_PER_XDR_UNIT);
if (ptr != NULL) {
/*
* We can do the fast path.
*/
const gid_t *gp = crgetgroups(cr);
IXDR_PUT_U_INT32(ptr, AUTH_SYS); /* cred flavor */
IXDR_PUT_U_INT32(ptr, credsize); /* cred len */
IXDR_PUT_INT32(ptr, gethrestime_sec());
IXDR_PUT_U_INT32(ptr, namelen);
bcopy(nodename, ptr, namelen);
if ((rounded_namelen - namelen) > 0)
bzero((char *)ptr + namelen, rounded_namelen - namelen);
ptr += rounded_namelen / BYTES_PER_XDR_UNIT;
IXDR_PUT_U_INT32(ptr, crgetuid(cr));
IXDR_PUT_U_INT32(ptr, crgetgid(cr));
IXDR_PUT_U_INT32(ptr, gidlen);
while (gidlen-- > 0)
IXDR_PUT_U_INT32(ptr, *gp++);
IXDR_PUT_U_INT32(ptr, AUTH_NULL); /* verf flavor */
IXDR_PUT_U_INT32(ptr, 0); /* verf len */
return (TRUE);
}
sercred = kmem_alloc(MAX_AUTH_BYTES, KM_SLEEP);
/*
* Serialize the auth body data into sercred.
*/
xdrmem_create(&xdrm, sercred, MAX_AUTH_BYTES, XDR_ENCODE);
startpos = XDR_GETPOS(&xdrm);
if (!xdr_authkern(&xdrm, cr)) {
printf("authkern_marshal: xdr_authkern failed\n");
ret = FALSE;
goto done;
}
/*
* Make opaque auth credentials to point at the serialized auth body
* data.
*/
auth->ah_cred.oa_base = sercred;
auth->ah_cred.oa_length = XDR_GETPOS(&xdrm) - startpos;
ASSERT(auth->ah_cred.oa_length <= MAX_AUTH_BYTES);
/*
* serialize credentials and verifier (null)
*/
if ((xdr_opaque_auth(xdrs, &(auth->ah_cred))) &&
(xdr_opaque_auth(xdrs, &(auth->ah_verf))))
ret = TRUE;
else
ret = FALSE;
done:
XDR_DESTROY(&xdrm);
kmem_free(sercred, MAX_AUTH_BYTES);
return (ret);
}
/* ARGSUSED */
static bool_t
authkern_validate(AUTH *auth, struct opaque_auth *verf)
{
return (TRUE);
}
/* ARGSUSED */
static bool_t
authkern_refresh(AUTH *auth, struct rpc_msg *msg, cred_t *cr)
{
return (FALSE);
}
static void
authkern_destroy(AUTH *auth)
{
kmem_cache_free(authkern_cache, auth);
}
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