c6ec7d3183
towards replacing our mtree. Sponsored by: DARPA, AFRL Thanks to: cristos@NetBSD for reviewing and committing my patches wiz@NetBSD for fixing typos in my patches
432 lines
9.9 KiB
C
432 lines
9.9 KiB
C
/* $NetBSD: getid.c,v 1.7 2008/04/28 20:24:17 martin Exp $ */
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/* from: NetBSD: getpwent.c,v 1.48 2000/10/03 03:22:26 enami Exp */
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/* from: NetBSD: getgrent.c,v 1.41 2002/01/12 23:51:30 lukem Exp */
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/*
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* Copyright (c) 1987, 1988, 1989, 1993, 1994, 1995
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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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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn of Wasabi Systems.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE 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 HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: getid.c,v 1.7 2008/04/28 20:24:17 martin Exp $");
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#include <sys/param.h>
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#include <grp.h>
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#include <limits.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "extern.h"
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static struct group * gi_getgrnam(const char *);
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static struct group * gi_getgrgid(gid_t);
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static int gi_setgroupent(int);
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static void gi_endgrent(void);
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static int grstart(void);
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static int grscan(int, gid_t, const char *);
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static int grmatchline(int, gid_t, const char *);
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static struct passwd * gi_getpwnam(const char *);
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static struct passwd * gi_getpwuid(uid_t);
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static int gi_setpassent(int);
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static void gi_endpwent(void);
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static int pwstart(void);
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static int pwscan(int, uid_t, const char *);
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static int pwmatchline(int, uid_t, const char *);
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#define MAXGRP 200
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#define MAXLINELENGTH 1024
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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 FILE *_pw_fp;
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static struct passwd _pw_passwd; /* password structure */
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static int _pw_stayopen; /* keep fd's open */
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static int _pw_filesdone;
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static char grfile[MAXPATHLEN];
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static char pwfile[MAXPATHLEN];
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static char *members[MAXGRP];
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static char grline[MAXLINELENGTH];
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static char pwline[MAXLINELENGTH];
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int
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setup_getid(const char *dir)
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{
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if (dir == NULL)
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return (0);
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/* close existing databases */
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gi_endgrent();
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gi_endpwent();
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/* build paths to new databases */
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snprintf(grfile, sizeof(grfile), "%s/group", dir);
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snprintf(pwfile, sizeof(pwfile), "%s/master.passwd", dir);
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/* try to open new databases */
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if (!grstart() || !pwstart())
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return (0);
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/* switch pwcache(3) lookup functions */
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if (pwcache_groupdb(gi_setgroupent, gi_endgrent,
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gi_getgrnam, gi_getgrgid) == -1
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|| pwcache_userdb(gi_setpassent, gi_endpwent,
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gi_getpwnam, gi_getpwuid) == -1)
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return (0);
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return (1);
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}
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/*
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* group lookup functions
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*/
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static struct group *
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gi_getgrnam(const char *name)
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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, 0, name);
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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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static struct group *
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gi_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);
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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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static int
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gi_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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static void
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gi_endgrent(void)
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{
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_gr_filesdone = 0;
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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
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grstart(void)
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{
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_gr_filesdone = 0;
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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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if (grfile[0] == '\0') /* sanity check */
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return 0;
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return (_gr_fp = fopen(grfile, "r")) ? 1 : 0;
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}
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static int
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grscan(int search, gid_t gid, const char *name)
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{
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if (_gr_filesdone)
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return 0;
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for (;;) {
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if (!fgets(grline, sizeof(grline), _gr_fp)) {
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if (!search)
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_gr_filesdone = 1;
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return 0;
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}
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/* skip lines that are too big */
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if (!strchr(grline, '\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))
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return 1;
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}
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/* NOTREACHED */
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}
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static int
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grmatchline(int search, gid_t gid, const char *name)
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{
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unsigned long id;
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char **m;
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char *cp, *bp, *ep;
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/* name may be NULL if search is nonzero */
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bp = grline;
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memset(&_gr_group, 0, sizeof(_gr_group));
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_gr_group.gr_name = strsep(&bp, ":\n");
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if (search && name && strcmp(_gr_group.gr_name, name))
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return 0;
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_gr_group.gr_passwd = strsep(&bp, ":\n");
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if (!(cp = strsep(&bp, ":\n")))
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return 0;
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id = strtoul(cp, &ep, 10);
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if (id > GID_MAX || *ep != '\0')
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return 0;
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_gr_group.gr_gid = (gid_t)id;
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if (search && name == NULL && _gr_group.gr_gid != gid)
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return 0;
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cp = NULL;
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if (bp == NULL)
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return 0;
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for (_gr_group.gr_mem = m = members;; bp++) {
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if (m == &members[MAXGRP - 1])
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break;
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if (*bp == ',') {
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if (cp) {
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*bp = '\0';
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*m++ = cp;
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cp = NULL;
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}
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} else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
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if (cp) {
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*bp = '\0';
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*m++ = cp;
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}
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break;
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} else if (cp == NULL)
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cp = bp;
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}
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*m = NULL;
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return 1;
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}
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/*
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* user lookup functions
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*/
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static struct passwd *
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gi_getpwnam(const char *name)
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{
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int rval;
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if (!pwstart())
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return NULL;
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rval = pwscan(1, 0, name);
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if (!_pw_stayopen)
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endpwent();
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return (rval) ? &_pw_passwd : NULL;
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}
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static struct passwd *
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gi_getpwuid(uid_t uid)
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{
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int rval;
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if (!pwstart())
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return NULL;
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rval = pwscan(1, uid, NULL);
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if (!_pw_stayopen)
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endpwent();
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return (rval) ? &_pw_passwd : NULL;
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}
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static int
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gi_setpassent(int stayopen)
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{
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if (!pwstart())
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return 0;
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_pw_stayopen = stayopen;
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return 1;
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}
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static void
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gi_endpwent(void)
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{
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_pw_filesdone = 0;
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if (_pw_fp) {
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(void)fclose(_pw_fp);
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_pw_fp = NULL;
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}
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}
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static int
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pwstart(void)
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{
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_pw_filesdone = 0;
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if (_pw_fp) {
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rewind(_pw_fp);
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return 1;
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}
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if (pwfile[0] == '\0') /* sanity check */
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return 0;
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return (_pw_fp = fopen(pwfile, "r")) ? 1 : 0;
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}
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static int
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pwscan(int search, uid_t uid, const char *name)
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{
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if (_pw_filesdone)
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return 0;
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for (;;) {
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if (!fgets(pwline, sizeof(pwline), _pw_fp)) {
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if (!search)
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_pw_filesdone = 1;
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return 0;
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}
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/* skip lines that are too big */
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if (!strchr(pwline, '\n')) {
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int ch;
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while ((ch = getc(_pw_fp)) != '\n' && ch != EOF)
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;
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continue;
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}
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if (pwmatchline(search, uid, name))
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return 1;
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}
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/* NOTREACHED */
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}
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static int
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pwmatchline(int search, uid_t uid, const char *name)
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{
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unsigned long id;
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char *cp, *bp, *ep;
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/* name may be NULL if search is nonzero */
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bp = pwline;
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memset(&_pw_passwd, 0, sizeof(_pw_passwd));
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_pw_passwd.pw_name = strsep(&bp, ":\n"); /* name */
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if (search && name && strcmp(_pw_passwd.pw_name, name))
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return 0;
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_pw_passwd.pw_passwd = strsep(&bp, ":\n"); /* passwd */
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if (!(cp = strsep(&bp, ":\n"))) /* uid */
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return 0;
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id = strtoul(cp, &ep, 10);
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if (id > UID_MAX || *ep != '\0')
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return 0;
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_pw_passwd.pw_uid = (uid_t)id;
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if (search && name == NULL && _pw_passwd.pw_uid != uid)
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return 0;
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if (!(cp = strsep(&bp, ":\n"))) /* gid */
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return 0;
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id = strtoul(cp, &ep, 10);
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if (id > GID_MAX || *ep != '\0')
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return 0;
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_pw_passwd.pw_gid = (gid_t)id;
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if (!(ep = strsep(&bp, ":"))) /* class */
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return 0;
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if (!(ep = strsep(&bp, ":"))) /* change */
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return 0;
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if (!(ep = strsep(&bp, ":"))) /* expire */
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return 0;
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if (!(_pw_passwd.pw_gecos = strsep(&bp, ":\n"))) /* gecos */
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return 0;
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if (!(_pw_passwd.pw_dir = strsep(&bp, ":\n"))) /* directory */
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return 0;
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if (!(_pw_passwd.pw_shell = strsep(&bp, ":\n"))) /* shell */
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return 0;
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if (strchr(bp, ':') != NULL)
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return 0;
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return 1;
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}
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