[apple/system_cmds.git] / pwd_mkdb.tproj / pwd_mkdb.c

/*	$OpenBSD: pwd_mkdb.c,v 1.36 2003/06/08 21:14:55 millert 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.
 * Portions Copyright (c) 1998, Todd C. Miller.  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. 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.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1991, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static const char sccsid[] = "from: @(#)pwd_mkdb.c	8.5 (Berkeley) 4/20/94";
#else
static const char rcsid[] = "$OpenBSD: pwd_mkdb.c,v 1.36 2003/06/08 21:14:55 millert Exp $";
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>

#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.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>
#include <sys/param.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)

#define FILE_SECURE	0x01
#define FILE_INSECURE	0x02
#define FILE_ORIG	0x04

#define	SHADOW_GROUP	"wheel"

HASHINFO openinfo = {
	4096,		/* bsize */
	32,		/* ffactor */
	256,		/* nelem */
	2048 * 1024,	/* cachesize */
	NULL,		/* hash() */
	0		/* lorder */
};

static char *pname;				/* password file name */
static char *basedir;				/* dir holding master.passwd */
static int clean;				/* what to remove on cleanup */
static int hasyp;				/* are we running YP? */

void	cleanup(void);
void	error(char *);
void	errorx(char *);
void	cp(char *, char *, mode_t);
void	mv(char *, char *);
int	scan(FILE *, struct passwd *, int *);
void	usage(void);
char	*changedir(char *path, char *dir);
void	db_store(FILE *, FILE *, DB *, DB *,struct passwd *, int, char *, uid_t);

int
main(int argc, char **argv)
{
	DB *dp, *edp;
	DBT data, key;
	FILE *fp, *oldfp = NULL;
	struct stat st;
	struct passwd pwd;
	struct group *grp;
	sigset_t set;
	uid_t olduid;
	gid_t shadow;
	int ch, tfd, makeold, secureonly, flags, checkonly;
	char *username, buf[MAX(MAXPATHLEN, LINE_MAX * 2)];

	flags = checkonly = makeold = secureonly = 0;
	username = NULL;
	while ((ch = getopt(argc, argv, "cd:psu:v")) != -1)
		switch (ch) {
		case 'c':			/* verify only */
			checkonly = 1;
			break;
		case 'd':
			basedir = optarg;
			if (strlen(basedir) > MAXPATHLEN - 40)
				errx(1, "basedir too long");
			break;
		case 'p':			/* create V7 "file.orig" */
			makeold = 1;
			break;
		case 's':			/* only update spwd.db */
			secureonly = 1;
			break;
		case 'u':			/* only update this record */
			username = optarg;
			if (strlen(username) > _PW_NAME_LEN)
				errx(1, "username too long");
			break;
		case 'v':			/* backward compatible */
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc != 1 || (makeold && secureonly) ||
	    (username && (*username == '+' || *username == '-')))
		usage();
	
	if ((grp = getgrnam(SHADOW_GROUP)) == NULL)
		errx(1, "cannot find `%s' in the group database, aborting",
		    SHADOW_GROUP);
	shadow = grp->gr_gid;

	/*
	 * 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);

	if (**argv != '/' && basedir == NULL)
		errx(1, "%s must be specified as an absolute path", *argv);

	if ((pname = strdup(changedir(*argv, basedir))) == NULL)
		err(1, NULL);
	/* Open the original password file */
	if (!(fp = fopen(pname, "r")))
		error(pname);

	/* Check only if password database is valid */
	if (checkonly) {
		u_int cnt;

		for (cnt = 1; scan(fp, &pwd, &flags); ++cnt)
			;
		exit(0);
	}

	if (fstat(fileno(fp), &st) == -1)
		error(pname);

	/* Tweak openinfo values for large passwd files. */
	if (st.st_size > (off_t)100*1024)
		openinfo.cachesize = MIN(st.st_size * 20, (off_t)12*1024*1024);
	if (st.st_size / 128 > openinfo.nelem)
		openinfo.nelem = st.st_size / 128;

        /* If only updating a single record, stash the old uid */
	if (username) {
		dp = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL);
		if (dp == NULL)
			error(_PATH_MP_DB);
		buf[0] = _PW_KEYBYNAME;
		strlcpy(buf + 1, username, sizeof(buf) - 1);
		key.data = (u_char *)buf;
		key.size = strlen(buf + 1) + 1;
		if ((dp->get)(dp, &key, &data, 0) == 0) {
			char *p = (char *)data.data;
			/* Skip to uid field */
			while (*p++ != '\0')
				;
			while (*p++ != '\0')
				;
			memcpy(&olduid, p, sizeof(olduid));
		} else
			olduid = UID_MAX;
		(dp->close)(dp);
	}

	/* Open the temporary encrypted password database. */
	(void)snprintf(buf, sizeof(buf), "%s.tmp",
	    changedir(_PATH_SMP_DB, basedir));
	if (username) {
		cp(changedir(_PATH_SMP_DB, basedir), buf, PERM_SECURE);
		edp = dbopen(buf,
		    O_RDWR, PERM_SECURE, DB_HASH, &openinfo);
	} else {
		edp = dbopen(buf,
		    O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
	}
	if (!edp)
		error(buf);
	if (fchown(edp->fd(edp), (uid_t)-1, shadow) != 0)
		warn("%s: unable to set group to %s", _PATH_SMP_DB,
		    SHADOW_GROUP);
	else if (fchmod(edp->fd(edp), PERM_SECURE|S_IRGRP) != 0)
		warn("%s: unable to make group readable", _PATH_SMP_DB);
	clean |= FILE_SECURE;

	/* Open the temporary insecure password database. */
	if (!secureonly) {
		(void)snprintf(buf, sizeof(buf), "%s.tmp",
		    changedir(_PATH_MP_DB, basedir));
		if (username) {
			cp(changedir(_PATH_MP_DB, basedir), buf, PERM_INSECURE);
			dp = dbopen(buf, O_RDWR, PERM_INSECURE, DB_HASH,
			    &openinfo);
		} else {
			dp = dbopen(buf, O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE,
			    DB_HASH, &openinfo);
		}
		if (dp == NULL)
			error(buf);
		clean |= FILE_INSECURE;
	} else
		dp = NULL;

	/*
	 * 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(buf, sizeof(buf), "%s.orig", pname);
		if ((tfd = open(buf,
		    O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0)
			error(buf);
		if ((oldfp = fdopen(tfd, "w")) == NULL)
			error(buf);
		clean |= FILE_ORIG;
	}

	/*
	 * 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.)
	 *
	 * 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.
	 */

	/*
	 * Write the .db files.
	 * We do this three times, one per key type (for getpw{nam,uid,ent}).
	 * The first time through we also check for YP, issue warnings
	 * and save the V7 format passwd file if necessary.
	 */
	db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYNAME, username, olduid);
	db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYUID, username, olduid);
	db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYNUM, username, olduid);

	/* Store YP token, if needed. */
	if (hasyp && !username) {
		key.data = (u_char *)_PW_YPTOKEN;
		key.size = strlen(_PW_YPTOKEN);
		data.data = (u_char *)NULL;
		data.size = 0;

		if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1)
			error("put");

		if (dp && (dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
			error("put");
	}

	if ((edp->close)(edp))
		error("close edp");
	if (dp && (dp->close)(dp))
		error("close dp");
	if (makeold) {
		if (fclose(oldfp) == EOF)
			error("close old");
	}

	/* Set master.passwd permissions, in case caller forgot. */
	(void)fchmod(fileno(fp), S_IRUSR|S_IWUSR);
	if (fclose(fp) != 0)
		error("fclose");

	/* Install as the real password files. */
	if (!secureonly) {
		(void)snprintf(buf, sizeof(buf), "%s.tmp",
		    changedir(_PATH_MP_DB, basedir));
		mv(buf, changedir(_PATH_MP_DB, basedir));
	}
	(void)snprintf(buf, sizeof(buf), "%s.tmp",
	    changedir(_PATH_SMP_DB, basedir));
	mv(buf, changedir(_PATH_SMP_DB, basedir));
	if (makeold) {
		(void)snprintf(buf, sizeof(buf), "%s.orig", pname);
		mv(buf, changedir(_PATH_PASSWD, basedir));
	}

	/*
	 * 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.
	 */
	mv(pname, changedir(_PATH_MASTERPASSWD, basedir));
	exit(0);
}

int
scan(FILE *fp, struct passwd *pw, int *flags)
{
	static int lcnt;
	static char line[LINE_MAX];
	char *p;

	if (fgets(line, sizeof(line), fp) == NULL)
		return (0);
	++lcnt;
	/*
	 * ``... if I swallow anything evil, put your fingers down my
	 * throat...''
	 *	-- The Who
	 */
	p = line;
	if (*p != '\0' && *(p += strlen(line) - 1) != '\n') {
		warnx("line too long");
		goto fmt;
	}
	*p = '\0';
	*flags = 0;
	if (!pw_scan(line, pw, flags)) {
		warnx("at line #%d", lcnt);
fmt:		errno = EFTYPE;	/* XXX */
		error(pname);
	}

	return (1);
}

void                    
cp(from, to, mode)              
	char *from, *to;
	mode_t mode;    
{               
	static char buf[MAXBSIZE];
	int from_fd, rcount, to_fd, wcount;

	if ((from_fd = open(from, O_RDONLY, 0)) < 0)
		error(from);
	if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0)
		error(to);
	while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
		wcount = write(to_fd, buf, rcount);
		if (rcount != wcount || wcount == -1) {
			int sverrno = errno;

			(void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
			errno = sverrno;
			error(buf);
		}
	}
	if (rcount < 0) {
		int sverrno = errno;

		(void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
		errno = sverrno;
		error(buf);
	}
}

void
mv(from, to)
	char *from, *to;
{
	char buf[MAXPATHLEN * 2];

	if (rename(from, to)) {
		int sverrno = errno;

		(void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
		errno = sverrno;
		error(buf);
	}
}

void
error(name)
	char *name;
{

	warn("%s", name);
	cleanup();
	exit(1);
}

void
errorx(name)
	char *name;
{

	warnx("%s", name);
	cleanup();
	exit(1);
}

void
cleanup()
{
	char buf[MAXPATHLEN];

	if (clean & FILE_ORIG) {
		(void)snprintf(buf, sizeof(buf), "%s.orig", pname);
		(void)unlink(buf);
	}
	if (clean & FILE_SECURE) {
		(void)snprintf(buf, sizeof(buf), "%s.tmp",
		    changedir(_PATH_SMP_DB, basedir));
		(void)unlink(buf);
	}
	if (clean & FILE_INSECURE) {
		(void)snprintf(buf, sizeof(buf), "%s.tmp",
		    changedir(_PATH_MP_DB, basedir));
		(void)unlink(buf);
	}
}

void
usage(void)
{

	(void)fprintf(stderr,
	    "usage: pwd_mkdb [-c] [-p | -s] [-d basedir] [-u username] file\n");
	exit(1);
}

char *
changedir(char *path, char *dir)
{
	static char fixed[MAXPATHLEN];
	char *p;

	if (!dir)
		return (path);

	if ((p = strrchr(path, '/')) != NULL)
		path = p + 1;
	snprintf(fixed, sizeof(fixed), "%s/%s", dir, path);
	return (fixed);
}

void
db_store(FILE *fp, FILE *oldfp, DB *edp, DB *dp, struct passwd *pw,
	 int keytype, char *username, uid_t olduid)
{
	int flags = 0;
	int dbmode, found = 0;
	u_int cnt;
	char *p, *t, buf[LINE_MAX * 2], tbuf[1024];
	DBT data, key;
	size_t len;
	static int firsttime = 1;

	/* If given a username just add that record to the existing db. */
	dbmode = username ? 0 : R_NOOVERWRITE;

	rewind(fp);
	data.data = (u_char *)buf;
	key.data = (u_char *)tbuf;
	for (cnt = 1; scan(fp, pw, &flags); ++cnt) {

#ifdef __APPLE__
		if (pw->pw_name == NULL)
			continue;
#endif

		if (firsttime) {
			/* Look like YP? */
			if ((pw->pw_name[0] == '+') || (pw->pw_name[0] == '-'))
				hasyp++;

			/* Warn about potentially unsafe uid/gid overrides. */
			if (pw->pw_name[0] == '+') {
				if (!(flags & _PASSWORD_NOUID) && !pw->pw_uid)
					warnx("line %d: superuser override in "
					    "YP inclusion", cnt);
				if (!(flags & _PASSWORD_NOGID) && !pw->pw_gid)
					warnx("line %d: wheel override in "
					    "YP inclusion", cnt);
			}

			/* Create V7 format password file entry. */
			if (oldfp != NULL)
				if (fprintf(oldfp, "%s:*:%u:%u:%s:%s:%s\n",
				    pw->pw_name, pw->pw_uid, pw->pw_gid,
				    pw->pw_gecos, pw->pw_dir, pw->pw_shell)
				    == EOF)
					error("write old");
		}

		/* Are we updating a specific record? */
		if (username) {
			if (strcmp(username, pw->pw_name) != 0)
				continue;
			found = 1;
			/* If the uid changed, remove the old record by uid. */
			if (olduid != UID_MAX && olduid != pw->pw_uid) {
				tbuf[0] = _PW_KEYBYUID;
				memcpy(tbuf + 1, &olduid, sizeof(olduid));
				key.size = sizeof(olduid) + 1;
				(edp->del)(edp, &key, 0);
				if (dp)
					(dp->del)(dp, &key, 0);
			}
			/* XXX - should check to see if line number changed. */
		}

		/* Build the key. */
		tbuf[0] = keytype;
		switch (keytype) {
		case _PW_KEYBYNUM:
			memmove(tbuf + 1, &cnt, sizeof(cnt));
			key.size = sizeof(cnt) + 1;
			break;

		case _PW_KEYBYNAME:
			len = strlen(pw->pw_name);
			memmove(tbuf + 1, pw->pw_name, len);
			key.size = len + 1;
			break;

		case _PW_KEYBYUID:
			memmove(tbuf + 1, &pw->pw_uid, sizeof(pw->pw_uid));
			key.size = sizeof(pw->pw_uid) + 1;
			break;
		}

#define	COMPACT(e)	t = e; while ((*p++ = *t++));
		/* Create the secure record. */
		p = buf;
		COMPACT(pw->pw_name);
		COMPACT(pw->pw_passwd);
		memmove(p, &pw->pw_uid, sizeof(uid_t));
		p += sizeof(uid_t);
		memmove(p, &pw->pw_gid, sizeof(gid_t));
		p += sizeof(gid_t);
		memmove(p, &pw->pw_change, sizeof(time_t));
		p += sizeof(time_t);
		COMPACT(pw->pw_class);
		COMPACT(pw->pw_gecos);
		COMPACT(pw->pw_dir);
		COMPACT(pw->pw_shell);
		memmove(p, &pw->pw_expire, sizeof(time_t));
		p += sizeof(time_t);
		memmove(p, &flags, sizeof(int));
		p += sizeof(int);
		data.size = p - buf;

		/* Write the secure record. */
		if ((edp->put)(edp, &key, &data, dbmode) == -1)
			error("put");

		if (dp == NULL)
			continue;

		/* Star out password to make insecure record. */
		p = buf + strlen(pw->pw_name) + 1;	/* skip pw_name */
		len = strlen(pw->pw_passwd);
		memset(p, 0, len);			/* zero pw_passwd */
		t = p + len + 1;			/* skip pw_passwd */
		if (len != 0)
			*p++ = '*';
		*p++ = '\0';
		memmove(p, t, data.size - (t - buf));
		data.size -= len - 1;

		/* Write the insecure record. */
		if ((dp->put)(dp, &key, &data, dbmode) == -1)
			error("put");
	}
	if (firsttime) {
		firsttime = 0;
		if (username && !found && olduid != UID_MAX)
			errorx("can't find user in master.passwd");
	}
}
Commit	Line	Data
c3a08f59 A	1	/* $OpenBSD: pwd_mkdb.c,v 1.36 2003/06/08 21:14:55 millert Exp $ */
c3a08f59 A	2
1815bff5 A	3	/*-
	4	* Copyright (c) 1991, 1993, 1994
	5	* The Regents of the University of California. All rights reserved.
c3a08f59 A	6	* Portions Copyright (c) 1994, Jason Downs. All rights reserved.
c3a08f59 A	7	* Portions Copyright (c) 1998, Todd C. Miller. All rights reserved.
1815bff5 A	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in the
	16	* documentation and/or other materials provided with the distribution.
c3a08f59	17	* 3. Neither the name of the University nor the names of its contributors
1815bff5 A	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
c3a08f59	35	static const char copyright[] =
1815bff5 A	36	"@(#) Copyright (c) 1991, 1993, 1994\n\
	37	The Regents of the University of California. All rights reserved.\n";
	38	#endif /* not lint */
	39
	40	#ifndef lint
c3a08f59 A	41	#if 0
	42	static const char sccsid[] = "from: @(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94";
	43	#else
	44	static const char rcsid[] = "$OpenBSD: pwd_mkdb.c,v 1.36 2003/06/08 21:14:55 millert Exp $";
	45	#endif
1815bff5 A	46	#endif /* not lint */
	47
	48	#include <sys/param.h>
	49	#include <sys/stat.h>
	50
	51	#include <db.h>
	52	#include <err.h>
	53	#include <errno.h>
	54	#include <fcntl.h>
c3a08f59	55	#include <grp.h>
1815bff5 A	56	#include <limits.h>
	57	#include <pwd.h>
	58	#include <signal.h>
	59	#include <stdio.h>
	60	#include <stdlib.h>
	61	#include <string.h>
	62	#include <unistd.h>
c3a08f59 A	63	#include <util.h>
c3a08f59 A	64	#include <sys/param.h>
1815bff5 A	65
	66	#define INSECURE 1
	67	#define SECURE 2
	68	#define PERM_INSECURE (S_IRUSR\|S_IWUSR\|S_IRGRP\|S_IROTH)
	69	#define PERM_SECURE (S_IRUSR\|S_IWUSR)
	70
c3a08f59 A	71	#define FILE_SECURE 0x01
	72	#define FILE_INSECURE 0x02
	73	#define FILE_ORIG 0x04
	74
	75	#define SHADOW_GROUP "wheel"
	76
1815bff5 A	77	HASHINFO openinfo = {
	78	4096, /* bsize */
	79	32, /* ffactor */
	80	256, /* nelem */
	81	2048 * 1024, /* cachesize */
	82	NULL, /* hash() */
	83	0 /* lorder */
	84	};
	85
1815bff5	86	static char pname; / password file name */
c3a08f59 A	87	static char basedir; / dir holding master.passwd */
	88	static int clean; /* what to remove on cleanup */
	89	static int hasyp; /* are we running YP? */
	90
	91	void cleanup(void);
	92	void error(char *);
	93	void errorx(char *);
	94	void cp(char , char , mode_t);
	95	void mv(char , char );
	96	int scan(FILE , struct passwd , int *);
	97	void usage(void);
	98	char changedir(char path, char *dir);
	99	void db_store(FILE , FILE , DB , DB ,struct passwd , int, char , uid_t);
1815bff5 A	100
1815bff5 A	101	int
c3a08f59	102	main(int argc, char **argv)
1815bff5 A	103	{
	104	DB dp, edp;
	105	DBT data, key;
c3a08f59 A	106	FILE fp, oldfp = NULL;
	107	struct stat st;
	108	struct passwd pwd;
	109	struct group *grp;
1815bff5	110	sigset_t set;
c3a08f59 A	111	uid_t olduid;
	112	gid_t shadow;
	113	int ch, tfd, makeold, secureonly, flags, checkonly;
	114	char username, buf[MAX(MAXPATHLEN, LINE_MAX 2)];
	115
	116	flags = checkonly = makeold = secureonly = 0;
	117	username = NULL;
	118	while ((ch = getopt(argc, argv, "cd:psu:v")) != -1)
	119	switch (ch) {
	120	case 'c': /* verify only */
	121	checkonly = 1;
	122	break;
	123	case 'd':
	124	basedir = optarg;
	125	if (strlen(basedir) > MAXPATHLEN - 40)
	126	errx(1, "basedir too long");
	127	break;
1815bff5 A	128	case 'p': /* create V7 "file.orig" */
	129	makeold = 1;
	130	break;
c3a08f59 A	131	case 's': /* only update spwd.db */
	132	secureonly = 1;
	133	break;
	134	case 'u': /* only update this record */
	135	username = optarg;
	136	if (strlen(username) > _PW_NAME_LEN)
	137	errx(1, "username too long");
	138	break;
1815bff5 A	139	case 'v': /* backward compatible */
	140	break;
	141	case '?':
	142	default:
	143	usage();
	144	}
	145	argc -= optind;
	146	argv += optind;
	147
c3a08f59 A	148	if (argc != 1 \|\| (makeold && secureonly) \|\|
c3a08f59 A	149	(username && (username == '+' \|\| username == '-')))
1815bff5	150	usage();
c3a08f59 A	151
	152	if ((grp = getgrnam(SHADOW_GROUP)) == NULL)
	153	errx(1, "cannot find `%s' in the group database, aborting",
	154	SHADOW_GROUP);
	155	shadow = grp->gr_gid;
1815bff5 A	156
	157	/*
	158	* This could be changed to allow the user to interrupt.
	159	* Probably not worth the effort.
	160	*/
	161	sigemptyset(&set);
	162	sigaddset(&set, SIGTSTP);
	163	sigaddset(&set, SIGHUP);
	164	sigaddset(&set, SIGINT);
	165	sigaddset(&set, SIGQUIT);
	166	sigaddset(&set, SIGTERM);
	167	(void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL);
	168
	169	/* We don't care what the user wants. */
	170	(void)umask(0);
	171
c3a08f59 A	172	if (**argv != '/' && basedir == NULL)
	173	errx(1, "%s must be specified as an absolute path", *argv);
	174
	175	if ((pname = strdup(changedir(*argv, basedir))) == NULL)
	176	err(1, NULL);
1815bff5 A	177	/* Open the original password file */
	178	if (!(fp = fopen(pname, "r")))
	179	error(pname);
	180
c3a08f59 A	181	/* Check only if password database is valid */
	182	if (checkonly) {
	183	u_int cnt;
	184
	185	for (cnt = 1; scan(fp, &pwd, &flags); ++cnt)
	186	;
	187	exit(0);
	188	}
	189
	190	if (fstat(fileno(fp), &st) == -1)
	191	error(pname);
	192
	193	/* Tweak openinfo values for large passwd files. */
	194	if (st.st_size > (off_t)100*1024)
	195	openinfo.cachesize = MIN(st.st_size * 20, (off_t)1210241024);
	196	if (st.st_size / 128 > openinfo.nelem)
	197	openinfo.nelem = st.st_size / 128;
	198
	199	/* If only updating a single record, stash the old uid */
	200	if (username) {
	201	dp = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL);
	202	if (dp == NULL)
	203	error(_PATH_MP_DB);
	204	buf[0] = _PW_KEYBYNAME;
	205	strlcpy(buf + 1, username, sizeof(buf) - 1);
	206	key.data = (u_char *)buf;
	207	key.size = strlen(buf + 1) + 1;
	208	if ((dp->get)(dp, &key, &data, 0) == 0) {
	209	char p = (char )data.data;
	210	/* Skip to uid field */
	211	while (*p++ != '\0')
	212	;
	213	while (*p++ != '\0')
	214	;
	215	memcpy(&olduid, p, sizeof(olduid));
	216	} else
	217	olduid = UID_MAX;
	218	(dp->close)(dp);
	219	}
	220
	221	/* Open the temporary encrypted password database. */
	222	(void)snprintf(buf, sizeof(buf), "%s.tmp",
	223	changedir(_PATH_SMP_DB, basedir));
	224	if (username) {
	225	cp(changedir(_PATH_SMP_DB, basedir), buf, PERM_SECURE);
	226	edp = dbopen(buf,
	227	O_RDWR, PERM_SECURE, DB_HASH, &openinfo);
	228	} else {
	229	edp = dbopen(buf,
	230	O_RDWR\|O_CREAT\|O_EXCL, PERM_SECURE, DB_HASH, &openinfo);
	231	}
	232	if (!edp)
1815bff5	233	error(buf);
c3a08f59 A	234	if (fchown(edp->fd(edp), (uid_t)-1, shadow) != 0)
	235	warn("%s: unable to set group to %s", _PATH_SMP_DB,
	236	SHADOW_GROUP);
	237	else if (fchmod(edp->fd(edp), PERM_SECURE\|S_IRGRP) != 0)
	238	warn("%s: unable to make group readable", _PATH_SMP_DB);
	239	clean \|= FILE_SECURE;
	240
	241	/* Open the temporary insecure password database. */
	242	if (!secureonly) {
	243	(void)snprintf(buf, sizeof(buf), "%s.tmp",
	244	changedir(_PATH_MP_DB, basedir));
	245	if (username) {
	246	cp(changedir(_PATH_MP_DB, basedir), buf, PERM_INSECURE);
	247	dp = dbopen(buf, O_RDWR, PERM_INSECURE, DB_HASH,
	248	&openinfo);
	249	} else {
	250	dp = dbopen(buf, O_RDWR\|O_CREAT\|O_EXCL, PERM_INSECURE,
	251	DB_HASH, &openinfo);
	252	}
	253	if (dp == NULL)
	254	error(buf);
	255	clean \|= FILE_INSECURE;
	256	} else
	257	dp = NULL;
1815bff5 A	258
	259	/*
	260	* Open file for old password file. Minor trickiness -- don't want to
	261	* chance the file already existing, since someone (stupidly) might
	262	* still be using this for permission checking. So, open it first and
	263	* fdopen the resulting fd. The resulting file should be readable by
	264	* everyone.
	265	*/
	266	if (makeold) {
	267	(void)snprintf(buf, sizeof(buf), "%s.orig", pname);
	268	if ((tfd = open(buf,
	269	O_WRONLY\|O_CREAT\|O_EXCL, PERM_INSECURE)) < 0)
	270	error(buf);
	271	if ((oldfp = fdopen(tfd, "w")) == NULL)
	272	error(buf);
c3a08f59	273	clean \|= FILE_ORIG;
1815bff5 A	274	}
	275
	276	/*
	277	* The databases actually contain three copies of the original data.
	278	* Each password file entry is converted into a rough approximation
	279	* of a ``struct passwd'', with the strings placed inline. This
	280	* object is then stored as the data for three separate keys. The
	281	* first key * is the pw_name field prepended by the _PW_KEYBYNAME
	282	* character. The second key is the pw_uid field prepended by the
	283	* _PW_KEYBYUID character. The third key is the line number in the
	284	* original file prepended by the _PW_KEYBYNUM character. (The special
	285	* characters are prepended to ensure that the keys do not collide.)
c3a08f59 A	286	*
	287	* If we see something go by that looks like YP, we save a special
	288	* pointer record, which if YP is enabled in the C lib, will speed
	289	* things up.
1815bff5	290	*/
1815bff5	291
c3a08f59 A	292	/*
	293	* Write the .db files.
	294	* We do this three times, one per key type (for getpw{nam,uid,ent}).
	295	* The first time through we also check for YP, issue warnings
	296	* and save the V7 format passwd file if necessary.
	297	*/
	298	db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYNAME, username, olduid);
	299	db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYUID, username, olduid);
	300	db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYNUM, username, olduid);
1815bff5	301
c3a08f59 A	302	/* Store YP token, if needed. */
	303	if (hasyp && !username) {
	304	key.data = (u_char *)_PW_YPTOKEN;
	305	key.size = strlen(_PW_YPTOKEN);
	306	data.data = (u_char *)NULL;
	307	data.size = 0;
1815bff5	308
1815bff5 A	309	if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1)
	310	error("put");
	311
c3a08f59	312	if (dp && (dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1)
1815bff5 A	313	error("put");
	314	}
	315
c3a08f59 A	316	if ((edp->close)(edp))
	317	error("close edp");
	318	if (dp && (dp->close)(dp))
	319	error("close dp");
	320	if (makeold) {
	321	if (fclose(oldfp) == EOF)
	322	error("close old");
	323	}
1815bff5 A	324
	325	/* Set master.passwd permissions, in case caller forgot. */
	326	(void)fchmod(fileno(fp), S_IRUSR\|S_IWUSR);
c3a08f59 A	327	if (fclose(fp) != 0)
c3a08f59 A	328	error("fclose");
1815bff5 A	329
1815bff5 A	330	/* Install as the real password files. */
c3a08f59 A	331	if (!secureonly) {
	332	(void)snprintf(buf, sizeof(buf), "%s.tmp",
	333	changedir(_PATH_MP_DB, basedir));
	334	mv(buf, changedir(_PATH_MP_DB, basedir));
	335	}
	336	(void)snprintf(buf, sizeof(buf), "%s.tmp",
	337	changedir(_PATH_SMP_DB, basedir));
	338	mv(buf, changedir(_PATH_SMP_DB, basedir));
1815bff5 A	339	if (makeold) {
1815bff5 A	340	(void)snprintf(buf, sizeof(buf), "%s.orig", pname);
c3a08f59	341	mv(buf, changedir(_PATH_PASSWD, basedir));
1815bff5	342	}
c3a08f59	343
1815bff5 A	344	/*
	345	* Move the master password LAST -- chpass(1), passwd(1) and vipw(8)
	346	* all use flock(2) on it to block other incarnations of themselves.
	347	* The rename means that everything is unlocked, as the original file
	348	* can no longer be accessed.
	349	*/
c3a08f59	350	mv(pname, changedir(_PATH_MASTERPASSWD, basedir));
1815bff5 A	351	exit(0);
	352	}
	353
	354	int
c3a08f59	355	scan(FILE fp, struct passwd pw, int *flags)
1815bff5 A	356	{
	357	static int lcnt;
	358	static char line[LINE_MAX];
	359	char *p;
	360
c3a08f59	361	if (fgets(line, sizeof(line), fp) == NULL)
1815bff5	362	return (0);
1815bff5 A	363	++lcnt;
	364	/*
	365	* ``... if I swallow anything evil, put your fingers down my
	366	* throat...''
	367	* -- The Who
	368	*/
c3a08f59 A	369	p = line;
c3a08f59 A	370	if (p != '\0' && (p += strlen(line) - 1) != '\n') {
1815bff5 A	371	warnx("line too long");
1815bff5 A	372	goto fmt;
1815bff5 A	373	}
1815bff5 A	374	*p = '\0';
c3a08f59 A	375	*flags = 0;
c3a08f59 A	376	if (!pw_scan(line, pw, flags)) {
1815bff5 A	377	warnx("at line #%d", lcnt);
	378	fmt: errno = EFTYPE; /* XXX */
	379	error(pname);
	380	}
	381
	382	return (1);
	383	}
	384
c3a08f59 A	385	void
	386	cp(from, to, mode)
	387	char from, to;
	388	mode_t mode;
	389	{
	390	static char buf[MAXBSIZE];
	391	int from_fd, rcount, to_fd, wcount;
	392
	393	if ((from_fd = open(from, O_RDONLY, 0)) < 0)
	394	error(from);
	395	if ((to_fd = open(to, O_WRONLY\|O_CREAT\|O_EXCL, mode)) < 0)
	396	error(to);
	397	while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
	398	wcount = write(to_fd, buf, rcount);
	399	if (rcount != wcount \|\| wcount == -1) {
	400	int sverrno = errno;
	401
	402	(void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
	403	errno = sverrno;
	404	error(buf);
	405	}
	406	}
	407	if (rcount < 0) {
	408	int sverrno = errno;
	409
	410	(void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
	411	errno = sverrno;
	412	error(buf);
	413	}
	414	}
	415
1815bff5 A	416	void
	417	mv(from, to)
	418	char from, to;
	419	{
c3a08f59	420	char buf[MAXPATHLEN * 2];
1815bff5 A	421
	422	if (rename(from, to)) {
	423	int sverrno = errno;
c3a08f59	424
1815bff5 A	425	(void)snprintf(buf, sizeof(buf), "%s to %s", from, to);
	426	errno = sverrno;
	427	error(buf);
	428	}
	429	}
	430
	431	void
	432	error(name)
	433	char *name;
	434	{
	435
c3a08f59 A	436	warn("%s", name);
	437	cleanup();
	438	exit(1);
	439	}
	440
	441	void
	442	errorx(name)
	443	char *name;
	444	{
	445
	446	warnx("%s", name);
1815bff5 A	447	cleanup();
	448	exit(1);
	449	}
	450
	451	void
	452	cleanup()
	453	{
	454	char buf[MAXPATHLEN];
	455
c3a08f59	456	if (clean & FILE_ORIG) {
1815bff5 A	457	(void)snprintf(buf, sizeof(buf), "%s.orig", pname);
1815bff5 A	458	(void)unlink(buf);
c3a08f59 A	459	}
	460	if (clean & FILE_SECURE) {
	461	(void)snprintf(buf, sizeof(buf), "%s.tmp",
	462	changedir(_PATH_SMP_DB, basedir));
1815bff5	463	(void)unlink(buf);
c3a08f59 A	464	}
	465	if (clean & FILE_INSECURE) {
	466	(void)snprintf(buf, sizeof(buf), "%s.tmp",
	467	changedir(_PATH_MP_DB, basedir));
1815bff5 A	468	(void)unlink(buf);
	469	}
	470	}
	471
	472	void
c3a08f59	473	usage(void)
1815bff5 A	474	{
1815bff5 A	475
c3a08f59 A	476	(void)fprintf(stderr,
c3a08f59 A	477	"usage: pwd_mkdb [-c] [-p \| -s] [-d basedir] [-u username] file\n");
1815bff5 A	478	exit(1);
1815bff5 A	479	}
c3a08f59 A	480
	481	char *
	482	changedir(char path, char dir)
	483	{
	484	static char fixed[MAXPATHLEN];
	485	char *p;
	486
	487	if (!dir)
	488	return (path);
	489
	490	if ((p = strrchr(path, '/')) != NULL)
	491	path = p + 1;
	492	snprintf(fixed, sizeof(fixed), "%s/%s", dir, path);
	493	return (fixed);
	494	}
	495
	496	void
	497	db_store(FILE fp, FILE oldfp, DB edp, DB dp, struct passwd *pw,
	498	int keytype, char *username, uid_t olduid)
	499	{
	500	int flags = 0;
	501	int dbmode, found = 0;
	502	u_int cnt;
	503	char p, t, buf[LINE_MAX * 2], tbuf[1024];
	504	DBT data, key;
	505	size_t len;
	506	static int firsttime = 1;
	507
	508	/* If given a username just add that record to the existing db. */
	509	dbmode = username ? 0 : R_NOOVERWRITE;
	510
	511	rewind(fp);
	512	data.data = (u_char *)buf;
	513	key.data = (u_char *)tbuf;
	514	for (cnt = 1; scan(fp, pw, &flags); ++cnt) {
	515
83f6dbe8 A	516	#ifdef __APPLE__
	517	if (pw->pw_name == NULL)
	518	continue;
	519	#endif
	520
c3a08f59 A	521	if (firsttime) {
	522	/* Look like YP? */
	523	if ((pw->pw_name[0] == '+') \|\| (pw->pw_name[0] == '-'))
	524	hasyp++;
	525
	526	/* Warn about potentially unsafe uid/gid overrides. */
	527	if (pw->pw_name[0] == '+') {
	528	if (!(flags & _PASSWORD_NOUID) && !pw->pw_uid)
	529	warnx("line %d: superuser override in "
	530	"YP inclusion", cnt);
	531	if (!(flags & _PASSWORD_NOGID) && !pw->pw_gid)
	532	warnx("line %d: wheel override in "
	533	"YP inclusion", cnt);
	534	}
	535
	536	/* Create V7 format password file entry. */
	537	if (oldfp != NULL)
	538	if (fprintf(oldfp, "%s:*:%u:%u:%s:%s:%s\n",
	539	pw->pw_name, pw->pw_uid, pw->pw_gid,
	540	pw->pw_gecos, pw->pw_dir, pw->pw_shell)
	541	== EOF)
	542	error("write old");
	543	}
	544
	545	/* Are we updating a specific record? */
	546	if (username) {
	547	if (strcmp(username, pw->pw_name) != 0)
	548	continue;
	549	found = 1;
	550	/* If the uid changed, remove the old record by uid. */
	551	if (olduid != UID_MAX && olduid != pw->pw_uid) {
	552	tbuf[0] = _PW_KEYBYUID;
	553	memcpy(tbuf + 1, &olduid, sizeof(olduid));
	554	key.size = sizeof(olduid) + 1;
	555	(edp->del)(edp, &key, 0);
	556	if (dp)
	557	(dp->del)(dp, &key, 0);
	558	}
	559	/* XXX - should check to see if line number changed. */
	560	}
	561
	562	/* Build the key. */
	563	tbuf[0] = keytype;
	564	switch (keytype) {
	565	case _PW_KEYBYNUM:
	566	memmove(tbuf + 1, &cnt, sizeof(cnt));
	567	key.size = sizeof(cnt) + 1;
	568	break;
	569
	570	case _PW_KEYBYNAME:
	571	len = strlen(pw->pw_name);
	572	memmove(tbuf + 1, pw->pw_name, len);
	573	key.size = len + 1;
	574	break;
	575
	576	case _PW_KEYBYUID:
	577	memmove(tbuf + 1, &pw->pw_uid, sizeof(pw->pw_uid));
	578	key.size = sizeof(pw->pw_uid) + 1;
	579	break;
	580	}
	581
	582	#define COMPACT(e) t = e; while ((p++ = t++));
	583	/* Create the secure record. */
	584	p = buf;
585	COMPACT(pw->pw_name);
586	COMPACT(pw->pw_passwd);
587	memmove(p, &pw->pw_uid, sizeof(uid_t));
588	p += sizeof(uid_t);
589	memmove(p, &pw->pw_gid, sizeof(gid_t));
590	p += sizeof(gid_t);
591	memmove(p, &pw->pw_change, sizeof(time_t));
592	p += sizeof(time_t);
593	COMPACT(pw->pw_class);
594	COMPACT(pw->pw_gecos);
595	COMPACT(pw->pw_dir);
596	COMPACT(pw->pw_shell);
597	memmove(p, &pw->pw_expire, sizeof(time_t));
598	p += sizeof(time_t);
599	memmove(p, &flags, sizeof(int));
600	p += sizeof(int);
601	data.size = p - buf;
602
603	/* Write the secure record. */
604	if ((edp->put)(edp, &key, &data, dbmode) == -1)
605	error("put");
606
607	if (dp == NULL)
608	continue;
609
610	/* Star out password to make insecure record. */
611	p = buf + strlen(pw->pw_name) + 1; /* skip pw_name */
612	len = strlen(pw->pw_passwd);
613	memset(p, 0, len); /* zero pw_passwd */
614	t = p + len + 1; /* skip pw_passwd */
615	if (len != 0)
616	p++ = '';
617	*p++ = '\0';
618	memmove(p, t, data.size - (t - buf));
619	data.size -= len - 1;
620
621	/* Write the insecure record. */
622	if ((dp->put)(dp, &key, &data, dbmode) == -1)
623	error("put");
624	}
625	if (firsttime) {
626	firsttime = 0;
627	if (username && !found && olduid != UID_MAX)
628	errorx("can't find user in master.passwd");
629	}
630	}