Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/lib/libc/rpc/auth_unix.c

390 lines
9.8 KiB
C
Raw Blame History

/* $NetBSD: auth_unix.c,v 1.27 2020/10/03 18:31:29 christos Exp $ */
/*
* Copyright (c) 2010, Oracle America, Inc.
*
* 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 the "Oracle America, 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>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char *sccsid = "@(#)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";
#else
__RCSID("$NetBSD: auth_unix.c,v 1.27 2020/10/03 18:31:29 christos Exp $");
#endif
#endif
/*
* 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 its
* 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 "namespace.h"
#include "reentrant.h"
#include <sys/param.h>
#include <assert.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/auth_unix.h>
#ifdef __weak_alias
__weak_alias(authunix_create,_authunix_create)
__weak_alias(authunix_create_default,_authunix_create_default)
#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 *);
static void authunix_destroy(AUTH *);
static void marshal_new_auth(AUTH *);
static const 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(char *machname, int uid, int gid, int len, int *aup_gids)
{
struct authunix_parms aup;
char mymem[MAX_AUTH_BYTES];
struct timeval now;
XDR xdrs;
AUTH *auth;
struct audata *au;
/*
* Allocate and set up auth handle
*/
au = NULL;
auth = mem_alloc(sizeof(*auth));
#ifndef KERNEL
if (auth == NULL) {
warn("%s: out of memory", __func__);
goto cleanup_authunix_create;
}
#endif
au = mem_alloc(sizeof(*au));
#ifndef KERNEL
if (au == NULL) {
warn("%s: out of memory", __func__);
goto cleanup_authunix_create;
}
#endif
auth->ah_ops = authunix_ops();
auth->ah_private = 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 = (u_long)now.tv_sec; /* XXX: truncate on 32 bit */
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 KERNEL
au->au_origcred.oa_base = mem_alloc((size_t)len);
#else
if ((au->au_origcred.oa_base = mem_alloc((size_t)len)) == NULL) {
warn("%s: out of memory", __func__);
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);
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
}
/*
* Some servers will refuse mounts if the group list is larger
* than it expects (like 8). This allows the application to set
* the maximum size of the group list that will be sent.
*/
static int maxgrplist = NGROUPS;
void
set_rpc_maxgrouplist(int num)
{
if (num < NGROUPS)
maxgrplist = num;
}
/*
* Returns an auth handle with parameters determined by doing lots of
* syscalls.
*/
AUTH *
authunix_create_default(void)
{
int len;
char machname[MAXHOSTNAMELEN + 1];
uid_t uid;
gid_t gid;
gid_t gids[NGRPS];
if (gethostname(machname, sizeof machname) == -1)
abort();
machname[sizeof(machname) - 1] = 0;
uid = geteuid();
gid = getegid();
if ((len = getgroups(NGRPS, gids)) < 0)
abort();
if (len > maxgrplist)
len = maxgrplist;
/* XXX: interface problem; those should all have been unsigned */
return (authunix_create(machname, (int)uid, (int)gid, len,
(int *)gids));
}
/*
* authunix operations
*/
/* ARGSUSED */
static void
authunix_nextverf(AUTH *auth)
{
/* no action necessary */
}
static bool_t
authunix_marshal(AUTH *auth, XDR *xdrs)
{
struct audata *au;
_DIAGASSERT(auth != NULL);
_DIAGASSERT(xdrs != NULL);
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;
_DIAGASSERT(auth != NULL);
_DIAGASSERT(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)
{
struct audata *au = AUTH_PRIVATE(auth);
struct authunix_parms aup;
struct timeval now;
XDR xdrs;
int stat;
_DIAGASSERT(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 = (u_long)now.tv_sec; /* XXX: truncate on 32 bit */
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)
{
struct audata *au;
_DIAGASSERT(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)
{
XDR xdr_stream;
XDR *xdrs = &xdr_stream;
struct audata *au;
_DIAGASSERT(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("%s: Fatal marshalling problem", __func__);
else
au->au_mpos = XDR_GETPOS(xdrs);
XDR_DESTROY(xdrs);
}
static const struct auth_ops *
authunix_ops(void)
{
static struct auth_ops ops;
#ifdef _REENTRANT
extern mutex_t ops_lock;
#endif
/* 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;
}
mutex_unlock(&ops_lock);
return (&ops);
}
Reference in New Issue View Git Blame Copy Permalink