383 lines
9.5 KiB
C
383 lines
9.5 KiB
C
/* $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ */
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/*-
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char *sccsid2 = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 "namespace.h"
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#include "reentrant.h"
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#include <sys/param.h>
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#include <assert.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.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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#include "un-namespace.h"
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#include "mt_misc.h"
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/* auth_unix.c */
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static void authunix_nextverf (AUTH *);
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static bool_t authunix_marshal (AUTH *, XDR *);
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static bool_t authunix_validate (AUTH *, struct opaque_auth *);
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static bool_t authunix_refresh (AUTH *, void *);
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static void authunix_destroy (AUTH *);
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static void marshal_new_auth (AUTH *);
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static struct auth_ops *authunix_ops (void);
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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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/*
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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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u_int uid;
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u_int gid;
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int len;
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u_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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AUTH *auth;
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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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au = NULL;
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auth = mem_alloc(sizeof(*auth));
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#ifndef _KERNEL
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if (auth == NULL) {
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warnx("authunix_create: out of memory");
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goto cleanup_authunix_create;
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}
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#endif
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au = mem_alloc(sizeof(*au));
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#ifndef _KERNEL
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if (au == NULL) {
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warnx("authunix_create: out of memory");
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goto cleanup_authunix_create;
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}
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#endif
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auth->ah_ops = authunix_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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au->au_origcred.oa_base = NULL;
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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, NULL);
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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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warnx("authunix_create: out of memory");
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goto cleanup_authunix_create;
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}
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#endif
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memmove(au->au_origcred.oa_base, mymem, (size_t)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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#ifndef _KERNEL
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cleanup_authunix_create:
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if (auth)
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mem_free(auth, sizeof(*auth));
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if (au) {
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if (au->au_origcred.oa_base)
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mem_free(au->au_origcred.oa_base, (u_int)len);
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mem_free(au, sizeof(*au));
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}
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return (NULL);
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#endif
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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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AUTH *auth;
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int ngids;
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long ngids_max;
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char machname[MAXHOSTNAMELEN + 1];
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uid_t uid;
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gid_t gid;
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gid_t *gids;
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ngids_max = sysconf(_SC_NGROUPS_MAX) + 1;
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gids = malloc(sizeof(gid_t) * ngids_max);
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if (gids == NULL)
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return (NULL);
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if (gethostname(machname, sizeof machname) == -1)
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abort();
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machname[sizeof(machname) - 1] = 0;
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uid = geteuid();
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gid = getegid();
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if ((ngids = getgroups(ngids_max, gids)) < 0)
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abort();
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if (ngids > NGRPS)
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ngids = NGRPS;
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/* XXX: interface problem; we should translate from uid_t and gid_t */
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auth = authunix_create(machname, uid, gid, ngids, gids);
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free(gids);
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return (auth);
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}
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/*
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* authunix operations
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*/
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/* ARGSUSED */
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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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struct audata *au;
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assert(auth != NULL);
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assert(xdrs != NULL);
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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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AUTH *auth;
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struct opaque_auth *verf;
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{
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struct audata *au;
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XDR xdrs;
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assert(auth != NULL);
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assert(verf != NULL);
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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,
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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 *auth, void *dummy)
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{
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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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int stat;
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assert(auth != NULL);
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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 = 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, NULL);
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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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AUTH *auth;
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{
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struct audata *au;
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assert(auth != NULL);
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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(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 void
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marshal_new_auth(auth)
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AUTH *auth;
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{
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XDR xdr_stream;
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XDR *xdrs = &xdr_stream;
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struct audata *au;
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assert(auth != NULL);
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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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warnx("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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XDR_DESTROY(xdrs);
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}
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static struct auth_ops *
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authunix_ops()
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{
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static struct auth_ops ops;
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/* VARIABLES PROTECTED BY ops_lock: ops */
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mutex_lock(&ops_lock);
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if (ops.ah_nextverf == NULL) {
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ops.ah_nextverf = authunix_nextverf;
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ops.ah_marshal = authunix_marshal;
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ops.ah_validate = authunix_validate;
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ops.ah_refresh = authunix_refresh;
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ops.ah_destroy = authunix_destroy;
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}
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mutex_unlock(&ops_lock);
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return (&ops);
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}
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