NetBSD/usr.sbin/pwd_mkdb/pwd_mkdb.c

492 lines
13 KiB
C

/* $NetBSD: pwd_mkdb.c,v 1.20 2000/08/08 12:08:17 ad Exp $ */
/*
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Portions Copyright(C) 1994, Jason Downs. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 2000\n\
The NetBSD Foundation, Inc. All rights reserved.\n\
Copyright (c) 1991, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n");
__SCCSID("from: @(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94");
__RCSID("$NetBSD: pwd_mkdb.c,v 1.20 2000/08/08 12:08:17 ad Exp $");
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#define INSECURE 1
#define SECURE 2
#define PERM_INSECURE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
#define PERM_SECURE (S_IRUSR | S_IWUSR)
/* pull this out of the C library. */
extern const char __yp_token[];
HASHINFO openinfo = {
4096, /* bsize */
32, /* ffactor */
256, /* nelem */
2048 * 1024, /* cachesize */
NULL, /* hash() */
0 /* lorder */
};
static enum { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean;
static char *pname; /* password file name */
static char prefix[MAXPATHLEN];
static char oldpwdfile[MAX(MAXPATHLEN, LINE_MAX * 2)];
static char pwd_db_tmp[MAX(MAXPATHLEN, LINE_MAX * 2)];
static char pwd_Sdb_tmp[MAX(MAXPATHLEN, LINE_MAX * 2)];
static int lorder = BYTE_ORDER;
void cleanup(void);
void error(const char *);
void wr_error(const char *);
int main(int, char **);
void install(const char *, const char *);
void rm(const char *);
int scan(FILE *, struct passwd *, int *, int *);
void usage(void);
void putdbent(DB *, struct passwd *, const char *, int, const char *, int);
void putyptoken(DB *dp, const char *fn);
int
main(int argc, char *argv[])
{
DB *dp, *edp;
FILE *fp, *oldfp;
sigset_t set;
int ch, makeold, tfd, hasyp, flags, lineno;
struct passwd pwd;
hasyp = 0;
oldfp = NULL;
strcpy(prefix, "/");
makeold = 0;
while ((ch = getopt(argc, argv, "d:pvBL")) != -1)
switch(ch) {
case 'd': /* set prefix */
strncpy(prefix, optarg, sizeof(prefix));
prefix[sizeof(prefix)-1] = '\0';
break;
case 'p': /* create V7 "file.orig" */
makeold = 1;
break;
case 'v': /* backward compatible */
break;
case 'B': /* big-endian output */
lorder = BIG_ENDIAN;
break;
case 'L': /* little-endian output */
lorder = LITTLE_ENDIAN;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
/*
* This could be changed to allow the user to interrupt.
* Probably not worth the effort.
*/
sigemptyset(&set);
sigaddset(&set, SIGTSTP);
sigaddset(&set, SIGHUP);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGQUIT);
sigaddset(&set, SIGTERM);
(void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL);
/* We don't care what the user wants. */
(void)umask(0);
pname = *argv;
/* Open the original password file */
if ((fp = fopen(pname, "r")) == NULL)
error(pname);
openinfo.lorder = lorder;
/* Open the temporary insecure password database. */
(void)snprintf(pwd_db_tmp, sizeof(pwd_db_tmp), "%s%s.tmp", prefix,
_PATH_MP_DB);
dp = dbopen(pwd_db_tmp, O_RDWR | O_CREAT | O_EXCL, PERM_INSECURE,
DB_HASH, &openinfo);
if (dp == NULL)
error(pwd_db_tmp);
clean = FILE_INSECURE;
/*
* Open file for old password file. Minor trickiness -- don't want to
* chance the file already existing, since someone (stupidly) might
* still be using this for permission checking. So, open it first and
* fdopen the resulting fd. The resulting file should be readable by
* everyone.
*/
if (makeold) {
(void)snprintf(oldpwdfile, sizeof(oldpwdfile), "%s.orig",
pname);
if ((tfd = open(oldpwdfile, O_WRONLY | O_CREAT | O_EXCL,
PERM_INSECURE)) < 0)
error(oldpwdfile);
if ((oldfp = fdopen(tfd, "w")) == NULL)
error(oldpwdfile);
clean = FILE_ORIG;
}
/*
* If we see something go by that looks like YP, we save a special
* pointer record, which if YP is enabled in the C lib, will speed
* things up.
*/
for (lineno = 0; scan(fp, &pwd, &flags, &lineno);) {
/* look like YP? */
if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')
hasyp++;
/*
* Warn about potentially unsafe uid/gid overrides.
*/
if (pwd.pw_name[0] == '+') {
if ((flags & _PASSWORD_NOUID) == 0 && pwd.pw_uid == 0)
warnx(
"line %d: superuser override in YP inclusion",
lineno);
if ((flags & _PASSWORD_NOGID) == 0 && pwd.pw_gid == 0)
warnx(
"line %d: wheel override in YP inclusion",
lineno);
}
putdbent(dp, &pwd, "*", flags, pwd_db_tmp, lineno);
/* Create original format password file entry */
if (makeold) {
(void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n",
pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos,
pwd.pw_dir, pwd.pw_shell);
if (ferror(oldfp))
wr_error(oldpwdfile);
}
}
/* Store YP token, if needed. */
if (hasyp)
putyptoken(dp, pwd_db_tmp);
if ((dp->close)(dp) < 0)
wr_error(pwd_db_tmp);
if (makeold) {
if (fflush(oldfp) == EOF)
wr_error(oldpwdfile);
if (fclose(oldfp) == EOF)
wr_error(oldpwdfile);
}
/* Open the temporary encrypted password database. */
(void)snprintf(pwd_Sdb_tmp, sizeof(pwd_Sdb_tmp), "%s%s.tmp", prefix,
_PATH_SMP_DB);
edp = dbopen(pwd_Sdb_tmp, O_RDWR | O_CREAT | O_EXCL, PERM_SECURE,
DB_HASH, &openinfo);
if (!edp)
error(pwd_Sdb_tmp);
clean = FILE_SECURE;
rewind(fp);
for (lineno = 0; scan(fp, &pwd, &flags, &lineno);)
putdbent(edp, &pwd, pwd.pw_passwd, flags, pwd_Sdb_tmp,
lineno);
/* Store YP token, if needed. */
if (hasyp)
putyptoken(edp, pwd_Sdb_tmp);
if ((edp->close)(edp) < 0)
wr_error(_PATH_SMP_DB);
/* Set master.passwd permissions, in case caller forgot. */
(void)fchmod(fileno(fp), S_IRUSR|S_IWUSR);
if (fclose(fp) == EOF)
wr_error(pname);
/* Install as the real password files. */
install(pwd_db_tmp, _PATH_MP_DB);
install(pwd_Sdb_tmp, _PATH_SMP_DB);
if (makeold)
install(oldpwdfile, _PATH_PASSWD);
/*
* Move the master password LAST -- chpass(1), passwd(1) and vipw(8)
* all use flock(2) on it to block other incarnations of themselves.
* The rename means that everything is unlocked, as the original
* file can no longer be accessed.
*/
install(pname, _PATH_MASTERPASSWD);
exit(EXIT_SUCCESS);
/* NOTREACHED */
}
int
scan(FILE *fp, struct passwd *pw, int *flags, int *lineno)
{
static char line[LINE_MAX];
char *p;
int oflags;
if (fgets(line, sizeof(line), fp) == NULL)
return (0);
(*lineno)++;
/*
* ``... if I swallow anything evil, put your fingers down my
* throat...''
* -- The Who
*/
if ((p = strchr(line, '\n')) == NULL) {
warnx("line too long");
errno = EFTYPE; /* XXX */
error(pname);
}
*p = '\0';
if (strcmp(line, "+") == 0)
strcpy(line, "+:::::::::"); /* pw_scan() can't handle "+" */
oflags = 0;
if (!pw_scan(line, pw, &oflags)) {
warnx("at line #%d", *lineno);
errno = EFTYPE; /* XXX */
error(pname);
}
*flags = oflags;
return (1);
}
void
install(const char *from, const char *to)
{
char buf[MAXPATHLEN];
int sverrno;
snprintf(buf, sizeof(buf), "%s%s", prefix, to);
if (rename(from, buf)) {
sverrno = errno;
(void)snprintf(buf, sizeof(buf), "%s to %s", from, buf);
errno = sverrno;
error(buf);
}
}
void
wr_error(const char *str)
{
char errbuf[BUFSIZ];
int sverrno;
sverrno = errno;
(void)snprintf(errbuf, sizeof(errbuf),
"attempt to write %s failed", str);
errno = sverrno;
error(errbuf);
}
void
error(const char *str)
{
warn("%s", str);
cleanup();
#ifdef think_about_this_a_while_longer
fprintf(stderr, "NOTE: possible inconsistencies between "
"text files and databases\n"
"re-run pwd_mkdb when you have fixed the problem.\n");
#endif
exit(EXIT_FAILURE);
}
void
rm(const char *victim)
{
if (unlink(victim) < 0)
warn("unlink(%s)", victim);
}
void
cleanup(void)
{
switch(clean) {
case FILE_ORIG:
rm(oldpwdfile);
/* FALLTHROUGH */
case FILE_SECURE:
rm(pwd_Sdb_tmp);
/* FALLTHROUGH */
case FILE_INSECURE:
rm(pwd_db_tmp);
/* FALLTHROUGH */
}
}
/*
* Write entries to a database for a single user.
*
* The databases actually contain three copies of the original data. Each
* password file entry is converted into a rough approximation of a ``struct
* passwd'', with the strings placed inline. This object is then stored as
* the data for three separate keys. The first key * is the pw_name field
* prepended by the _PW_KEYBYNAME character. The second key is the pw_uid
* field prepended by the _PW_KEYBYUID character. The third key is the line
* number in the original file prepended by the _PW_KEYBYNUM character.
* (The special characters are prepended to ensure that the keys do not
* collide.)
*/
#define COMPACT(e) for (t = e; (*p++ = *t++) != '\0';)
void
putdbent(DB *dp, struct passwd *pw, const char *passwd, int flags,
const char *fn, int lineno)
{
struct passwd pwd;
char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024], *p;
DBT data, key;
const char *t;
u_int32_t x;
int len;
memcpy(&pwd, pw, sizeof(pwd));
data.data = (u_char *)buf;
key.data = (u_char *)tbuf;
if (lorder != BYTE_ORDER) {
M_32_SWAP(pwd.pw_uid);
M_32_SWAP(pwd.pw_gid);
M_32_SWAP(pwd.pw_change);
M_32_SWAP(pwd.pw_expire);
}
/* Create insecure data. */
p = buf;
COMPACT(pwd.pw_name);
COMPACT(passwd);
memmove(p, &pwd.pw_uid, sizeof(pwd.pw_uid));
p += sizeof(pwd.pw_uid);
memmove(p, &pwd.pw_gid, sizeof(pwd.pw_gid));
p += sizeof(pwd.pw_gid);
memmove(p, &pwd.pw_change, sizeof(pwd.pw_change));
p += sizeof(pwd.pw_change);
COMPACT(pwd.pw_class);
COMPACT(pwd.pw_gecos);
COMPACT(pwd.pw_dir);
COMPACT(pwd.pw_shell);
memmove(p, &pwd.pw_expire, sizeof(pwd.pw_expire));
p += sizeof(pwd.pw_expire);
x = flags;
if (lorder != BYTE_ORDER)
M_32_SWAP(x);
memmove(p, &x, sizeof(x));
p += sizeof(flags);
data.size = p - buf;
/* Store insecure by name. */
tbuf[0] = _PW_KEYBYNAME;
len = strlen(pwd.pw_name);
memmove(tbuf + 1, pwd.pw_name, len);
key.size = len + 1;
if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
wr_error(fn);
/* Store insecure by number. */
tbuf[0] = _PW_KEYBYNUM;
x = lineno;
if (lorder != BYTE_ORDER)
M_32_SWAP(x);
memmove(tbuf + 1, &x, sizeof(x));
key.size = sizeof(x) + 1;
if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
wr_error(fn);
/* Store insecure by uid. */
tbuf[0] = _PW_KEYBYUID;
memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid));
key.size = sizeof(pwd.pw_uid) + 1;
if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
wr_error(fn);
}
void
putyptoken(DB *dp, const char *fn)
{
DBT data, key;
key.data = (u_char *)__yp_token;
key.size = strlen(__yp_token);
data.data = (u_char *)NULL;
data.size = 0;
if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
wr_error(fn);
}
void
usage(void)
{
(void)fprintf(stderr, "usage: pwd_mkdb [-pBL] [-d directory] file\n");
exit(EXIT_FAILURE);
}