492 lines
13 KiB
C
492 lines
13 KiB
C
/* $NetBSD: pwd_mkdb.c,v 1.21 2000/11/20 14:09:36 tron Exp $ */
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/*
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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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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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 2000\n\
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The NetBSD Foundation, Inc. All rights reserved.\n\
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Copyright (c) 1991, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n");
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__SCCSID("from: @(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94");
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__RCSID("$NetBSD: pwd_mkdb.c,v 1.21 2000/11/20 14:09:36 tron Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <db.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <pwd.h>
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#include <signal.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 <unistd.h>
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#include <util.h>
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#define INSECURE 1
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#define SECURE 2
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#define PERM_INSECURE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
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#define PERM_SECURE (S_IRUSR | S_IWUSR)
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/* pull this out of the C library. */
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extern const char __yp_token[];
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HASHINFO openinfo = {
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4096, /* bsize */
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32, /* ffactor */
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256, /* nelem */
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2048 * 1024, /* cachesize */
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NULL, /* hash() */
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0 /* lorder */
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};
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static enum { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean;
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static char *pname; /* password file name */
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static char prefix[MAXPATHLEN];
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static char oldpwdfile[MAX(MAXPATHLEN, LINE_MAX * 2)];
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static char pwd_db_tmp[MAX(MAXPATHLEN, LINE_MAX * 2)];
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static char pwd_Sdb_tmp[MAX(MAXPATHLEN, LINE_MAX * 2)];
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static int lorder = BYTE_ORDER;
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void cleanup(void);
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void error(const char *);
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void wr_error(const char *);
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int main(int, char **);
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void install(const char *, const char *);
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void rm(const char *);
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int scan(FILE *, struct passwd *, int *, int *);
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void usage(void);
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void putdbent(DB *, struct passwd *, const char *, int, const char *, int);
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void putyptoken(DB *dp, const char *fn);
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int
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main(int argc, char *argv[])
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{
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DB *dp, *edp;
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FILE *fp, *oldfp;
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sigset_t set;
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int ch, makeold, tfd, hasyp, flags, lineno;
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struct passwd pwd;
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hasyp = 0;
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oldfp = NULL;
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prefix[0] = '\0';
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makeold = 0;
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while ((ch = getopt(argc, argv, "d:pvBL")) != -1)
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switch(ch) {
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case 'd': /* set prefix */
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strncpy(prefix, optarg, sizeof(prefix));
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prefix[sizeof(prefix)-1] = '\0';
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break;
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case 'p': /* create V7 "file.orig" */
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makeold = 1;
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break;
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case 'v': /* backward compatible */
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break;
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case 'B': /* big-endian output */
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lorder = BIG_ENDIAN;
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break;
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case 'L': /* little-endian output */
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lorder = LITTLE_ENDIAN;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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usage();
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/*
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* This could be changed to allow the user to interrupt.
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* Probably not worth the effort.
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*/
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sigemptyset(&set);
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sigaddset(&set, SIGTSTP);
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sigaddset(&set, SIGHUP);
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sigaddset(&set, SIGINT);
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sigaddset(&set, SIGQUIT);
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sigaddset(&set, SIGTERM);
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(void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL);
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/* We don't care what the user wants. */
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(void)umask(0);
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pname = *argv;
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/* Open the original password file */
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if ((fp = fopen(pname, "r")) == NULL)
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error(pname);
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openinfo.lorder = lorder;
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/* Open the temporary insecure password database. */
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(void)snprintf(pwd_db_tmp, sizeof(pwd_db_tmp), "%s%s.tmp", prefix,
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_PATH_MP_DB);
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dp = dbopen(pwd_db_tmp, O_RDWR | O_CREAT | O_EXCL, PERM_INSECURE,
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DB_HASH, &openinfo);
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if (dp == NULL)
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error(pwd_db_tmp);
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clean = FILE_INSECURE;
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/*
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* Open file for old password file. Minor trickiness -- don't want to
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* chance the file already existing, since someone (stupidly) might
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* still be using this for permission checking. So, open it first and
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* fdopen the resulting fd. The resulting file should be readable by
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* everyone.
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*/
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if (makeold) {
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(void)snprintf(oldpwdfile, sizeof(oldpwdfile), "%s.orig",
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pname);
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if ((tfd = open(oldpwdfile, O_WRONLY | O_CREAT | O_EXCL,
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PERM_INSECURE)) < 0)
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error(oldpwdfile);
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if ((oldfp = fdopen(tfd, "w")) == NULL)
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error(oldpwdfile);
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clean = FILE_ORIG;
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}
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/*
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* If we see something go by that looks like YP, we save a special
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* pointer record, which if YP is enabled in the C lib, will speed
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* things up.
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*/
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for (lineno = 0; scan(fp, &pwd, &flags, &lineno);) {
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/* look like YP? */
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if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')
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hasyp++;
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/*
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* Warn about potentially unsafe uid/gid overrides.
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*/
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if (pwd.pw_name[0] == '+') {
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if ((flags & _PASSWORD_NOUID) == 0 && pwd.pw_uid == 0)
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warnx(
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"line %d: superuser override in YP inclusion",
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lineno);
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if ((flags & _PASSWORD_NOGID) == 0 && pwd.pw_gid == 0)
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warnx(
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"line %d: wheel override in YP inclusion",
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lineno);
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}
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putdbent(dp, &pwd, "*", flags, pwd_db_tmp, lineno);
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/* Create original format password file entry */
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if (makeold) {
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(void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n",
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pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos,
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pwd.pw_dir, pwd.pw_shell);
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if (ferror(oldfp))
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wr_error(oldpwdfile);
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}
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}
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/* Store YP token, if needed. */
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if (hasyp)
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putyptoken(dp, pwd_db_tmp);
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if ((dp->close)(dp) < 0)
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wr_error(pwd_db_tmp);
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if (makeold) {
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if (fflush(oldfp) == EOF)
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wr_error(oldpwdfile);
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if (fclose(oldfp) == EOF)
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wr_error(oldpwdfile);
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}
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/* Open the temporary encrypted password database. */
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(void)snprintf(pwd_Sdb_tmp, sizeof(pwd_Sdb_tmp), "%s%s.tmp", prefix,
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_PATH_SMP_DB);
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edp = dbopen(pwd_Sdb_tmp, O_RDWR | O_CREAT | O_EXCL, PERM_SECURE,
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DB_HASH, &openinfo);
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if (!edp)
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error(pwd_Sdb_tmp);
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clean = FILE_SECURE;
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rewind(fp);
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for (lineno = 0; scan(fp, &pwd, &flags, &lineno);)
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putdbent(edp, &pwd, pwd.pw_passwd, flags, pwd_Sdb_tmp,
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lineno);
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/* Store YP token, if needed. */
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if (hasyp)
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putyptoken(edp, pwd_Sdb_tmp);
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if ((edp->close)(edp) < 0)
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wr_error(_PATH_SMP_DB);
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/* Set master.passwd permissions, in case caller forgot. */
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(void)fchmod(fileno(fp), S_IRUSR|S_IWUSR);
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if (fclose(fp) == EOF)
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wr_error(pname);
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/* Install as the real password files. */
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install(pwd_db_tmp, _PATH_MP_DB);
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install(pwd_Sdb_tmp, _PATH_SMP_DB);
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if (makeold)
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install(oldpwdfile, _PATH_PASSWD);
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/*
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* Move the master password LAST -- chpass(1), passwd(1) and vipw(8)
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* all use flock(2) on it to block other incarnations of themselves.
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* The rename means that everything is unlocked, as the original
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* file can no longer be accessed.
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*/
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install(pname, _PATH_MASTERPASSWD);
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exit(EXIT_SUCCESS);
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/* NOTREACHED */
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}
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int
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scan(FILE *fp, struct passwd *pw, int *flags, int *lineno)
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{
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static char line[LINE_MAX];
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char *p;
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int oflags;
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if (fgets(line, sizeof(line), fp) == NULL)
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return (0);
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(*lineno)++;
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/*
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* ``... if I swallow anything evil, put your fingers down my
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* throat...''
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* -- The Who
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*/
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if ((p = strchr(line, '\n')) == NULL) {
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warnx("line too long");
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errno = EFTYPE; /* XXX */
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error(pname);
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}
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*p = '\0';
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if (strcmp(line, "+") == 0)
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strcpy(line, "+:::::::::"); /* pw_scan() can't handle "+" */
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oflags = 0;
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if (!pw_scan(line, pw, &oflags)) {
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warnx("at line #%d", *lineno);
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errno = EFTYPE; /* XXX */
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error(pname);
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}
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*flags = oflags;
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return (1);
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}
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void
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install(const char *from, const char *to)
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{
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char buf[MAXPATHLEN];
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int sverrno;
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snprintf(buf, sizeof(buf), "%s%s", prefix, to);
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if (rename(from, buf)) {
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sverrno = errno;
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(void)snprintf(buf, sizeof(buf), "%s to %s", from, buf);
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errno = sverrno;
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error(buf);
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}
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}
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void
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wr_error(const char *str)
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{
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char errbuf[BUFSIZ];
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int sverrno;
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sverrno = errno;
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(void)snprintf(errbuf, sizeof(errbuf),
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"attempt to write %s failed", str);
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errno = sverrno;
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error(errbuf);
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}
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void
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error(const char *str)
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{
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warn("%s", str);
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cleanup();
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#ifdef think_about_this_a_while_longer
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fprintf(stderr, "NOTE: possible inconsistencies between "
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"text files and databases\n"
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"re-run pwd_mkdb when you have fixed the problem.\n");
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#endif
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exit(EXIT_FAILURE);
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}
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void
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rm(const char *victim)
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{
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if (unlink(victim) < 0)
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warn("unlink(%s)", victim);
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}
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void
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cleanup(void)
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{
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switch(clean) {
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case FILE_ORIG:
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rm(oldpwdfile);
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/* FALLTHROUGH */
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case FILE_SECURE:
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rm(pwd_Sdb_tmp);
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/* FALLTHROUGH */
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case FILE_INSECURE:
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rm(pwd_db_tmp);
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/* FALLTHROUGH */
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}
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}
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/*
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* Write entries to a database for a single user.
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*
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* The databases actually contain three copies of the original data. Each
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* password file entry is converted into a rough approximation of a ``struct
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* passwd'', with the strings placed inline. This object is then stored as
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* the data for three separate keys. The first key * is the pw_name field
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* prepended by the _PW_KEYBYNAME character. The second key is the pw_uid
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* field prepended by the _PW_KEYBYUID character. The third key is the line
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* number in the original file prepended by the _PW_KEYBYNUM character.
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* (The special characters are prepended to ensure that the keys do not
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* collide.)
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*/
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#define COMPACT(e) for (t = e; (*p++ = *t++) != '\0';)
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void
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putdbent(DB *dp, struct passwd *pw, const char *passwd, int flags,
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const char *fn, int lineno)
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{
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struct passwd pwd;
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char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024], *p;
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DBT data, key;
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const char *t;
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u_int32_t x;
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int len;
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memcpy(&pwd, pw, sizeof(pwd));
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data.data = (u_char *)buf;
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key.data = (u_char *)tbuf;
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if (lorder != BYTE_ORDER) {
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M_32_SWAP(pwd.pw_uid);
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M_32_SWAP(pwd.pw_gid);
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M_32_SWAP(pwd.pw_change);
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M_32_SWAP(pwd.pw_expire);
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}
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/* Create insecure data. */
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p = buf;
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COMPACT(pwd.pw_name);
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COMPACT(passwd);
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memmove(p, &pwd.pw_uid, sizeof(pwd.pw_uid));
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p += sizeof(pwd.pw_uid);
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memmove(p, &pwd.pw_gid, sizeof(pwd.pw_gid));
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p += sizeof(pwd.pw_gid);
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memmove(p, &pwd.pw_change, sizeof(pwd.pw_change));
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p += sizeof(pwd.pw_change);
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COMPACT(pwd.pw_class);
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COMPACT(pwd.pw_gecos);
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COMPACT(pwd.pw_dir);
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COMPACT(pwd.pw_shell);
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memmove(p, &pwd.pw_expire, sizeof(pwd.pw_expire));
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p += sizeof(pwd.pw_expire);
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x = flags;
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if (lorder != BYTE_ORDER)
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M_32_SWAP(x);
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memmove(p, &x, sizeof(x));
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p += sizeof(flags);
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data.size = p - buf;
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/* Store insecure by name. */
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tbuf[0] = _PW_KEYBYNAME;
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len = strlen(pwd.pw_name);
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memmove(tbuf + 1, pwd.pw_name, len);
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key.size = len + 1;
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if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
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wr_error(fn);
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/* Store insecure by number. */
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tbuf[0] = _PW_KEYBYNUM;
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x = lineno;
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if (lorder != BYTE_ORDER)
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M_32_SWAP(x);
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memmove(tbuf + 1, &x, sizeof(x));
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key.size = sizeof(x) + 1;
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if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
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wr_error(fn);
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/* Store insecure by uid. */
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tbuf[0] = _PW_KEYBYUID;
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memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid));
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key.size = sizeof(pwd.pw_uid) + 1;
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if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
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wr_error(fn);
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}
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void
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putyptoken(DB *dp, const char *fn)
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{
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DBT data, key;
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key.data = (u_char *)__yp_token;
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key.size = strlen(__yp_token);
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data.data = (u_char *)NULL;
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data.size = 0;
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if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
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wr_error(fn);
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}
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void
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usage(void)
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{
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(void)fprintf(stderr, "usage: pwd_mkdb [-pBL] [-d directory] file\n");
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exit(EXIT_FAILURE);
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}
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