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/*
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
/*
* 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 <pthread.h>
#include <reentrant.h>
#include <sys/param.h>
#include <assert.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <rpc/clnt.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/auth_unix.h>
/* Workaround for Hurd */
#ifndef MAXHOSTNAMELEN
# define MAXHOSTNAMELEN 64
#endif
/* 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 (void);
/*
* 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(machname, uid, gid, len, aup_gids)
char *machname;
uid_t uid;
gid_t gid;
int len;
gid_t *aup_gids;
{
struct authunix_parms aup;
char mymem[MAX_AUTH_BYTES];
struct timeval now;
XDR xdrs;
AUTH *auth;
struct audata *au;
memset(&rpc_createerr, 0, sizeof(rpc_createerr));
/*
* Allocate and set up auth handle
*/
au = NULL;
auth = mem_alloc(sizeof(*auth));
#ifndef _KERNEL
if (auth == NULL) {
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = ENOMEM;
goto cleanup_authunix_create;
}
#endif
au = mem_alloc(sizeof(*au));
#ifndef _KERNEL
if (au == NULL) {
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = ENOMEM;
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;
/*
* fill in param struct from the given params
*/
(void)gettimeofday(&now, NULL);
aup.aup_time = now.tv_sec;
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)) {
rpc_createerr.cf_stat = RPC_CANTENCODEARGS;
goto cleanup_authunix_create;
}
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) {
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = ENOMEM;
goto cleanup_authunix_create;
}
#endif
memmove(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);
auth_get(auth); /* Reference for caller */
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
}
/*
* Returns an auth handle with parameters determined by doing lots of
* syscalls.
*/
AUTH *
authunix_create_default()
{
int len;
char machname[MAXHOSTNAMELEN + 1];
uid_t uid;
gid_t gid, *gids;
AUTH *result;
memset(&rpc_createerr, 0, sizeof(rpc_createerr));
if (gethostname(machname, sizeof machname) == -1) {
rpc_createerr.cf_error.re_errno = errno;
goto out_err;
}
machname[sizeof(machname) - 1] = 0;
uid = geteuid();
gid = getegid();
/* According to glibc comments, an intervening setgroups(2)
* call can increase the number of supplemental groups between
* these two getgroups(2) calls. */
retry:
len = getgroups(0, NULL);
if (len == -1) {
rpc_createerr.cf_error.re_errno = errno;
goto out_err;
}
/* Bump allocation size. A zero allocation size may result in a
* NULL calloc(3) result, which is not reliably distinguishable
* from a memory allocation error. */
gids = calloc(len + 1, sizeof(gid_t));
if (gids == NULL) {
rpc_createerr.cf_error.re_errno = ENOMEM;
goto out_err;
}
len = getgroups(len, gids);
if (len == -1) {
rpc_createerr.cf_error.re_errno = errno;
free(gids);
if (rpc_createerr.cf_error.re_errno == EINVAL) {
rpc_createerr.cf_error.re_errno = 0;
goto retry;
}
goto out_err;
}
/*
* AUTH_UNIX sends on the wire only the first NGRPS groups in the
* supplemental groups list.
*/
if (len > NGRPS)
len = NGRPS;
/* XXX: interface problem; those should all have been unsigned */
result = authunix_create(machname, uid, gid, len, gids);
free(gids);
return result;
out_err:
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
return NULL;
}
/*
* authunix operations
*/
/* ARGSUSED */
static void
authunix_nextverf(auth)
AUTH *auth;
{
/* no action necessary */
}
static bool_t
authunix_marshal(auth, xdrs)
AUTH *auth;
XDR *xdrs;
{
struct audata *au;
assert(auth != NULL);
assert(xdrs != NULL);
au = AUTH_PRIVATE(auth);
return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
}
static bool_t
authunix_validate(auth, verf)
AUTH *auth;
struct opaque_auth *verf;
{
struct audata *au;
XDR xdrs;
assert(auth != NULL);
assert(verf != NULL);
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 authunix_parms aup;
struct timeval now;
XDR xdrs;
int stat;
assert(auth != NULL);
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 = 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 */
(void)gettimeofday(&now, NULL);
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);
}
static void
authunix_destroy(auth)
AUTH *auth;
{
struct audata *au;
assert(auth != NULL);
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 *auth;
{
XDR xdr_stream;
XDR *xdrs = &xdr_stream;
struct audata *au;
assert(auth != NULL);
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))))
warnx("auth_none.c - Fatal marshalling problem");
else
au->au_mpos = XDR_GETPOS(xdrs);
XDR_DESTROY(xdrs);
}
static bool_t
authunix_wrap(AUTH *auth, XDR *xdrs, xdrproc_t xfunc, caddr_t xwhere)
{
return ((*xfunc)(xdrs, xwhere));
}
static struct auth_ops *
authunix_ops()
{
static struct auth_ops ops;
extern mutex_t ops_lock;
/* VARIABLES PROTECTED BY ops_lock: ops */
mutex_lock(&ops_lock);
if (ops.ah_nextverf == NULL) {
ops.ah_nextverf = authunix_nextverf;
ops.ah_marshal = authunix_marshal;
ops.ah_validate = authunix_validate;
ops.ah_refresh = authunix_refresh;
ops.ah_destroy = authunix_destroy;
ops.ah_wrap = authunix_wrap;
ops.ah_unwrap = authunix_wrap;
}
mutex_unlock(&ops_lock);
return (&ops);
}
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