786 lines
18 KiB
C
786 lines
18 KiB
C
/* $NetBSD: getgrent.c,v 1.47 2003/08/07 16:42:49 agc Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. 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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* 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 REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1994, Jason Downs. 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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* 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 REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94";
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#else
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__RCSID("$NetBSD: getgrent.c,v 1.47 2003/08/07 16:42:49 agc Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <grp.h>
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#include <limits.h>
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#include <nsswitch.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <stdarg.h>
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#ifdef HESIOD
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#include <hesiod.h>
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#endif
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#endif
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#if defined(YP) || defined(HESIOD)
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#define _GROUP_COMPAT
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#endif
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struct group *_getgrent_user(const char *);
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#ifdef __weak_alias
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__weak_alias(endgrent,_endgrent)
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__weak_alias(getgrent,_getgrent)
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__weak_alias(getgrgid,_getgrgid)
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__weak_alias(getgrnam,_getgrnam)
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__weak_alias(setgrent,_setgrent)
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__weak_alias(setgroupent,_setgroupent)
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#endif
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static FILE *_gr_fp;
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static struct group _gr_group;
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static int _gr_stayopen;
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static int _gr_filesdone;
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static void grcleanup(void);
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static int grscan(int, gid_t, const char *, const char *);
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static int grstart(void);
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static int grmatchline(int, gid_t, const char *, const char *);
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#define MAXGRP 200
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#define MAXLINELENGTH 1024
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static __aconst char *members[MAXGRP];
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static char line[MAXLINELENGTH];
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#ifdef YP
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static char *__ypcurrent, *__ypdomain;
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static int __ypcurrentlen;
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static int _gr_ypdone;
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#endif
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#ifdef HESIOD
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static int _gr_hesnum;
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static struct group *_gr_hesgrplist = NULL;
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static int _gr_hesgrplistnum;
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static int _gr_hesgrplistmax;
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#endif
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#ifdef _GROUP_COMPAT
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enum _grmode { GRMODE_NONE, GRMODE_FULL, GRMODE_NAME };
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static enum _grmode __grmode;
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#endif
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struct group *
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getgrent(void)
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{
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if ((!_gr_fp && !grstart()) || !grscan(0, 0, NULL, NULL))
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return (NULL);
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return &_gr_group;
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}
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/*
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* _getgrent_user() is designed only to be called by getgrouplist(3) and
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* hence makes no guarantees about filling the entire structure that it
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* returns. It may only fill in the group name and gid fields.
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*/
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struct group *
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_getgrent_user(const char *user)
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{
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if ((!_gr_fp && !grstart()) || !grscan(0, 0, NULL, user))
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return (NULL);
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return &_gr_group;
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}
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struct group *
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getgrnam(const char *name)
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{
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int rval;
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_DIAGASSERT(name != NULL);
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if (!grstart())
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return NULL;
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rval = grscan(1, 0, name, NULL);
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if (!_gr_stayopen)
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endgrent();
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return (rval) ? &_gr_group : NULL;
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}
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struct group *
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getgrgid(gid_t gid)
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{
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int rval;
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if (!grstart())
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return NULL;
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rval = grscan(1, gid, NULL, NULL);
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if (!_gr_stayopen)
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endgrent();
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return (rval) ? &_gr_group : NULL;
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}
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void
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grcleanup(void)
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{
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_gr_filesdone = 0;
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#ifdef YP
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if (__ypcurrent)
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free(__ypcurrent);
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__ypcurrent = NULL;
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_gr_ypdone = 0;
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#endif
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#ifdef HESIOD
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_gr_hesnum = 0;
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if (!_gr_hesgrplist)
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free(_gr_hesgrplist);
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_gr_hesgrplist = NULL;
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_gr_hesgrplistnum = -1;
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_gr_hesgrplistmax = 0;
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#endif
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#ifdef _GROUP_COMPAT
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__grmode = GRMODE_NONE;
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#endif
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}
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static int
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grstart(void)
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{
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grcleanup();
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if (_gr_fp) {
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rewind(_gr_fp);
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return 1;
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}
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return (_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0;
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}
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void
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setgrent(void)
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{
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(void) setgroupent(0);
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}
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int
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setgroupent(int stayopen)
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{
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if (!grstart())
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return 0;
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_gr_stayopen = stayopen;
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return 1;
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}
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void
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endgrent(void)
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{
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grcleanup();
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if (_gr_fp) {
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(void)fclose(_gr_fp);
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_gr_fp = NULL;
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}
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}
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static int _local_grscan(void *, void *, va_list);
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/*ARGSUSED*/
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static int
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_local_grscan(void *rv, void *cb_data, va_list ap)
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{
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int search = va_arg(ap, int);
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gid_t gid = va_arg(ap, gid_t);
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const char *name = va_arg(ap, const char *);
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const char *user = va_arg(ap, const char *);
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if (_gr_filesdone)
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return NS_NOTFOUND;
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for (;;) {
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if (!fgets(line, sizeof(line), _gr_fp)) {
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if (!search)
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_gr_filesdone = 1;
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return NS_NOTFOUND;
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}
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/* skip lines that are too big */
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if (!strchr(line, '\n')) {
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int ch;
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while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
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;
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continue;
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}
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if (grmatchline(search, gid, name, user))
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return NS_SUCCESS;
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}
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/* NOTREACHED */
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}
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#ifdef HESIOD
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static int _dns_grscan(void *, void *, va_list);
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static int _dns_grplist(const char *);
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/*ARGSUSED*/
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static int
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_dns_grscan(void *rv, void *cb_data, va_list ap)
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{
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int search = va_arg(ap, int);
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gid_t gid = va_arg(ap, gid_t);
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const char *name = va_arg(ap, const char *);
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const char *user = va_arg(ap, const char *);
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char **hp;
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void *context;
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int r;
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r = NS_UNAVAIL;
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if (!search && user && _gr_hesgrplistmax != -1) {
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r = _dns_grplist(user);
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/* if we did not find user.grplist, just iterate */
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if (!_gr_hesgrplist) {
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_gr_hesgrplistmax = -1;
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if (r != NS_NOTFOUND)
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return r;
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} else
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return r;
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}
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if (!search && _gr_hesnum == -1)
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return NS_NOTFOUND;
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if (hesiod_init(&context) == -1)
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return (r);
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for (;;) {
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if (search) {
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if (name)
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strlcpy(line, name, sizeof(line));
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else
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snprintf(line, sizeof(line), "%u",
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(unsigned int)gid);
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} else {
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snprintf(line, sizeof(line), "group-%u", _gr_hesnum);
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_gr_hesnum++;
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}
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hp = NULL;
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if (search && !name) {
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hp = hesiod_resolve(context, line, "gid");
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if (hp == NULL && errno != ENOENT)
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break;
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}
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if (hp == NULL)
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hp = hesiod_resolve(context, line, "group");
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if (hp == NULL) {
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if (errno == ENOENT) {
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if (!search)
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_gr_hesnum = -1;
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r = NS_NOTFOUND;
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}
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break;
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}
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/* only check first elem */
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strlcpy(line, hp[0], sizeof(line));
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hesiod_free_list(context, hp);
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if (grmatchline(search, gid, name, user)) {
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r = NS_SUCCESS;
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break;
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} else if (search) {
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r = NS_NOTFOUND;
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break;
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}
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}
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hesiod_end(context);
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return (r);
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}
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static int
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_dns_grplist(const char *user)
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{
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void *context;
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int r;
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char **hp;
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char *cp;
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r = NS_UNAVAIL;
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if (!_gr_hesgrplist) {
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if (hesiod_init(&context) == -1)
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return r;
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_gr_hesgrplistnum = -1;
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hp = hesiod_resolve(context, user, "grplist");
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if (!hp) {
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if (errno == ENOENT)
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r = NS_NOTFOUND;
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hesiod_end(context);
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return r;
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}
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strlcpy(line, hp[0], sizeof(line));
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hesiod_free_list(context, hp);
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_gr_hesgrplistmax = 0;
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for (cp=line; *cp; cp++)
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if (*cp == ':')
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_gr_hesgrplistmax++;
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_gr_hesgrplistmax /= 2;
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_gr_hesgrplistmax++;
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_gr_hesgrplist = malloc(_gr_hesgrplistmax *
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sizeof(*_gr_hesgrplist));
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if (!_gr_hesgrplist) {
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hesiod_end(context);
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return NS_UNAVAIL;
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}
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cp = line;
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_gr_hesgrplistmax = 0;
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for (;;) {
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char *name;
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char *num;
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gid_t gid;
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char *ep;
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/* XXXrcd: error handling */
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if (!(name = strsep(&cp, ":")))
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break;
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if (!(num = strsep(&cp, ":")))
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break;
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gid = (gid_t) strtoul(num, &ep, 10);
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if (gid > GID_MAX || *ep != '\0')
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break;
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_gr_hesgrplist[_gr_hesgrplistmax].gr_name = name;
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_gr_hesgrplist[_gr_hesgrplistmax].gr_gid = gid;
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_gr_hesgrplistmax++;
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}
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hesiod_end(context);
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}
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/* we assume that _gr_hesgrplist is now defined */
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if (++_gr_hesgrplistnum >= _gr_hesgrplistmax)
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return NS_NOTFOUND;
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|
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/*
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* Now we copy the relevant information into _gr_group, so that
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* it can be returned. Note that we only fill in the bare necessities
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* as this will be used exclusively by getgrouplist(3) and we do
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* not want to have to look up all of the information.
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*/
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_gr_group.gr_name = _gr_hesgrplist[_gr_hesgrplistnum].gr_name;
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_gr_group.gr_passwd = NULL;
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_gr_group.gr_gid = _gr_hesgrplist[_gr_hesgrplistnum].gr_gid;
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_gr_group.gr_mem = NULL;
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|
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return NS_SUCCESS;
|
|
}
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#endif /* HESIOD */
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|
|
#ifdef YP
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static int _nis_grscan(void *, void *, va_list);
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|
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/*ARGSUSED*/
|
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static int
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_nis_grscan(void *rv, void *cb_data, va_list ap)
|
|
{
|
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int search = va_arg(ap, int);
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gid_t gid = va_arg(ap, gid_t);
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const char *name = va_arg(ap, const char *);
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const char *user = va_arg(ap, const char *);
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char *key, *data;
|
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int keylen, datalen;
|
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int r;
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|
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if(__ypdomain == NULL) {
|
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switch (yp_get_default_domain(&__ypdomain)) {
|
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case 0:
|
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break;
|
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case YPERR_RESRC:
|
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return NS_TRYAGAIN;
|
|
default:
|
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return NS_UNAVAIL;
|
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}
|
|
}
|
|
|
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if (search) { /* specific group or gid */
|
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if (name)
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strlcpy(line, name, sizeof(line));
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else
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snprintf(line, sizeof(line), "%u", (unsigned int)gid);
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data = NULL;
|
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r = yp_match(__ypdomain,
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|
(name) ? "group.byname" : "group.bygid",
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line, (int)strlen(line), &data, &datalen);
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switch (r) {
|
|
case 0:
|
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break;
|
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case YPERR_KEY:
|
|
if (data)
|
|
free(data);
|
|
return NS_NOTFOUND;
|
|
default:
|
|
if (data)
|
|
free(data);
|
|
return NS_UNAVAIL;
|
|
}
|
|
data[datalen] = '\0'; /* clear trailing \n */
|
|
strlcpy(line, data, sizeof(line));
|
|
free(data);
|
|
if (grmatchline(search, gid, name, user))
|
|
return NS_SUCCESS;
|
|
else
|
|
return NS_NOTFOUND;
|
|
}
|
|
|
|
/* ! search */
|
|
if (_gr_ypdone)
|
|
return NS_NOTFOUND;
|
|
for (;;) {
|
|
data = NULL;
|
|
if(__ypcurrent) {
|
|
key = NULL;
|
|
r = yp_next(__ypdomain, "group.byname",
|
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__ypcurrent, __ypcurrentlen,
|
|
&key, &keylen, &data, &datalen);
|
|
free(__ypcurrent);
|
|
switch (r) {
|
|
case 0:
|
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break;
|
|
case YPERR_NOMORE:
|
|
__ypcurrent = NULL;
|
|
if (key)
|
|
free(key);
|
|
if (data)
|
|
free(data);
|
|
_gr_ypdone = 1;
|
|
return NS_NOTFOUND;
|
|
default:
|
|
if (key)
|
|
free(key);
|
|
if (data)
|
|
free(data);
|
|
return NS_UNAVAIL;
|
|
}
|
|
__ypcurrent = key;
|
|
__ypcurrentlen = keylen;
|
|
} else {
|
|
if (yp_first(__ypdomain, "group.byname",
|
|
&__ypcurrent, &__ypcurrentlen,
|
|
&data, &datalen)) {
|
|
if (data)
|
|
free(data);
|
|
return NS_UNAVAIL;
|
|
}
|
|
}
|
|
data[datalen] = '\0'; /* clear trailing \n */
|
|
strlcpy(line, data, sizeof(line));
|
|
free(data);
|
|
if (grmatchline(search, gid, name, user))
|
|
return NS_SUCCESS;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
#endif /* YP */
|
|
|
|
#ifdef _GROUP_COMPAT
|
|
/*
|
|
* log an error if "files" or "compat" is specified in group_compat database
|
|
*/
|
|
static int _bad_grscan(void *, void *, va_list);
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_bad_grscan(void *rv, void *cb_data, va_list ap)
|
|
{
|
|
static int warned;
|
|
|
|
_DIAGASSERT(cb_data != NULL);
|
|
|
|
if (!warned) {
|
|
syslog(LOG_ERR,
|
|
"nsswitch.conf group_compat database can't use '%s'",
|
|
(char *)cb_data);
|
|
}
|
|
warned = 1;
|
|
return NS_UNAVAIL;
|
|
}
|
|
|
|
/*
|
|
* when a name lookup in compat mode is required, look it up in group_compat
|
|
* nsswitch database. only Hesiod and NIS is supported - it doesn't make
|
|
* sense to lookup compat names from 'files' or 'compat'
|
|
*/
|
|
|
|
static int __grscancompat(int, gid_t, const char *, const char *);
|
|
|
|
static int
|
|
__grscancompat(int search, gid_t gid, const char *name, const char *user)
|
|
{
|
|
static const ns_dtab dtab[] = {
|
|
NS_FILES_CB(_bad_grscan, "files")
|
|
NS_DNS_CB(_dns_grscan, NULL)
|
|
NS_NIS_CB(_nis_grscan, NULL)
|
|
NS_COMPAT_CB(_bad_grscan, "compat")
|
|
{ 0 }
|
|
};
|
|
static const ns_src defaultnis[] = {
|
|
{ NSSRC_NIS, NS_SUCCESS },
|
|
{ 0 }
|
|
};
|
|
|
|
_DIAGASSERT(name != NULL);
|
|
|
|
return (nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "grscancompat",
|
|
defaultnis, search, gid, name, user));
|
|
}
|
|
#endif /* GROUP_COMPAT */
|
|
|
|
|
|
static int _compat_grscan(void *, void *, va_list);
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_compat_grscan(void *rv, void *cb_data, va_list ap)
|
|
{
|
|
int search = va_arg(ap, int);
|
|
gid_t gid = va_arg(ap, gid_t);
|
|
const char *name = va_arg(ap, const char *);
|
|
const char *user = va_arg(ap, const char *);
|
|
|
|
#ifdef _GROUP_COMPAT
|
|
static char *grname = NULL;
|
|
#endif
|
|
|
|
for (;;) {
|
|
#ifdef _GROUP_COMPAT
|
|
if(__grmode != GRMODE_NONE) {
|
|
int r;
|
|
|
|
switch(__grmode) {
|
|
case GRMODE_FULL:
|
|
r = __grscancompat(search, gid, name, user);
|
|
if (r == NS_SUCCESS)
|
|
return r;
|
|
__grmode = GRMODE_NONE;
|
|
break;
|
|
case GRMODE_NAME:
|
|
if(grname == (char *)NULL) {
|
|
__grmode = GRMODE_NONE;
|
|
break;
|
|
}
|
|
r = __grscancompat(1, 0, grname, user);
|
|
free(grname);
|
|
grname = (char *)NULL;
|
|
if (r != NS_SUCCESS)
|
|
break;
|
|
if (!search)
|
|
return NS_SUCCESS;
|
|
if (name) {
|
|
if (! strcmp(_gr_group.gr_name, name))
|
|
return NS_SUCCESS;
|
|
} else {
|
|
if (_gr_group.gr_gid == gid)
|
|
return NS_SUCCESS;
|
|
}
|
|
break;
|
|
case GRMODE_NONE:
|
|
abort();
|
|
}
|
|
continue;
|
|
}
|
|
#endif /* _GROUP_COMPAT */
|
|
|
|
if (!fgets(line, sizeof(line), _gr_fp))
|
|
return NS_NOTFOUND;
|
|
/* skip lines that are too big */
|
|
if (!strchr(line, '\n')) {
|
|
int ch;
|
|
|
|
while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
|
|
;
|
|
continue;
|
|
}
|
|
|
|
#ifdef _GROUP_COMPAT
|
|
if (line[0] == '+') {
|
|
char *tptr, *bp;
|
|
|
|
switch(line[1]) {
|
|
case ':':
|
|
case '\0':
|
|
case '\n':
|
|
__grmode = GRMODE_FULL;
|
|
break;
|
|
default:
|
|
__grmode = GRMODE_NAME;
|
|
bp = line;
|
|
tptr = strsep(&bp, ":\n");
|
|
grname = strdup(tptr + 1);
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
#endif /* _GROUP_COMPAT */
|
|
if (grmatchline(search, gid, name, user))
|
|
return NS_SUCCESS;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static int
|
|
grscan(int search, gid_t gid, const char *name, const char *user)
|
|
{
|
|
int r;
|
|
static const ns_dtab dtab[] = {
|
|
NS_FILES_CB(_local_grscan, NULL)
|
|
NS_DNS_CB(_dns_grscan, NULL)
|
|
NS_NIS_CB(_nis_grscan, NULL)
|
|
NS_COMPAT_CB(_compat_grscan, NULL)
|
|
{ 0 }
|
|
};
|
|
static const ns_src compatsrc[] = {
|
|
{ NSSRC_COMPAT, NS_SUCCESS },
|
|
{ 0 }
|
|
};
|
|
|
|
/* name may be NULL if search is nonzero */
|
|
|
|
r = nsdispatch(NULL, dtab, NSDB_GROUP, "grscan", compatsrc,
|
|
search, gid, name, user);
|
|
return (r == NS_SUCCESS) ? 1 : 0;
|
|
}
|
|
|
|
static int
|
|
grmatchline(int search, gid_t gid, const char *name, const char *user)
|
|
{
|
|
unsigned long id;
|
|
__aconst char **m;
|
|
char *cp, *bp, *ep;
|
|
|
|
/* name may be NULL if search is nonzero */
|
|
|
|
if (line[0] == '+')
|
|
return 0; /* sanity check to prevent recursion */
|
|
bp = line;
|
|
_gr_group.gr_name = strsep(&bp, ":\n");
|
|
if (search && name && strcmp(_gr_group.gr_name, name))
|
|
return 0;
|
|
_gr_group.gr_passwd = strsep(&bp, ":\n");
|
|
if (!(cp = strsep(&bp, ":\n")))
|
|
return 0;
|
|
id = strtoul(cp, &ep, 10);
|
|
if (id > GID_MAX || *ep != '\0')
|
|
return 0;
|
|
_gr_group.gr_gid = (gid_t)id;
|
|
if (search && name == NULL && _gr_group.gr_gid != gid)
|
|
return 0;
|
|
cp = NULL;
|
|
if (bp == NULL)
|
|
return 0;
|
|
for (_gr_group.gr_mem = m = members;; bp++) {
|
|
if (m == &members[MAXGRP - 1])
|
|
break;
|
|
if (*bp == ',') {
|
|
if (cp) {
|
|
*bp = '\0';
|
|
*m++ = cp;
|
|
cp = NULL;
|
|
}
|
|
} else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
|
|
if (cp) {
|
|
*bp = '\0';
|
|
*m++ = cp;
|
|
}
|
|
break;
|
|
} else if (cp == NULL)
|
|
cp = bp;
|
|
}
|
|
*m = NULL;
|
|
if (user) {
|
|
for (m = members; *m; m++)
|
|
if (!strcmp(user, *m))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|