Return to local_passwd.c CVS log

Up to [local] / src / usr.bin / passwd

Change the second arg to pw_mkdb() from a boolean flag to a set of
bit flags ORed together.  Currently the only flags defined are
_PASSWORD_SECUREONLY and _PASSWORD_OMITV7 but this is enough to
cause pw_mkdb() to run pwd_mkdb with the options we want.

With this change we no longer generate the old V7 passwd file when
only the extra fields in master.passwd (or the encrypted password)
have changed.  There are other programs that could probably use
the _PASSWORD_OMITV7 flag; they will be converted at a future date.

/*	$OpenBSD: local_passwd.c,v 1.20 2001/08/26 03:28:30 millert Exp $	*/

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * 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.
 */

#ifndef lint
/*static const char sccsid[] = "from: @(#)local_passwd.c	5.5 (Berkeley) 5/6/91";*/
static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.20 2001/08/26 03:28:30 millert Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>
#include <util.h>
#include <login_cap.h>

static uid_t uid;
extern int pwd_gensalt __P((char *, int, struct passwd *, login_cap_t *, char));
extern int pwd_check __P((struct passwd *, login_cap_t *, char *));
extern int pwd_gettries __P((struct passwd *, login_cap_t *));

char *getnewpasswd __P((struct passwd *, login_cap_t *, int));
void kbintr __P((int));

int
local_passwd(uname, authenticated)
	char *uname;
	int authenticated;
{
	struct passwd *pw;
	login_cap_t *lc;
	sigset_t fullset;
	time_t period;
	int pfd, tfd = -1;
	int pwflags = _PASSWORD_OMITV7;
	char *s = NULL;

	if (!(pw = getpwnam(uname))) {
#ifdef YP
		extern int use_yp;
		if (!use_yp)
#endif
		warnx("unknown user %s.", uname);
		return(1);
	}
	if ((lc = login_getclass(pw->pw_class)) == NULL) {
		warnx("unable to get login class for user %s.", uname);
		return(1);
	}

	uid = authenticated ? pw->pw_uid : getuid();
	if (uid && uid != pw->pw_uid) {
		warnx("login/uid mismatch, username argument required.");
		return(1);
	}

	/* Get the new password. */
	pw->pw_passwd = getnewpasswd(pw, lc, authenticated);

	/* Reset password change time based on login.conf. */
	period = login_getcaptime(lc, "passwordtime", 0, 0);
	if (period > 0) {
		pw->pw_change = time(NULL) + period;
	} else {
		/*
		 * If the pw change time is the same we only need
		 * to update the spwd.db file.
		 */
		if (pw->pw_change != 0)
			pw->pw_change = 0;
		else
			pwflags = _PASSWORD_SECUREONLY;
	}

	/* Drop user's real uid and block all signals to avoid a DoS. */
	setuid(0);
	sigfillset(&fullset);
	sigdelset(&fullset, SIGINT);
	sigprocmask(SIG_BLOCK, &fullset, NULL);

	/* Get a lock on the passwd file and open it. */
	pw_init();
	for (;;) {
		int i, c, d;

		for (i = 0; i < (s ? 64 : 8) && (tfd = pw_lock(0)) == -1; i++) {
			if (i == 0)
				(void)fputs("Please wait", stderr);
			(void)signal(SIGINT, kbintr);
			fputc('.', stderr);
			usleep(250000);
			(void)signal(SIGINT, SIG_IGN);
		}
		if (i)
			fputc('\n', stderr);
		if (tfd != -1)
			break;

		/* Unable to lock passwd file, let the user decide. */
		if (errno == EEXIST) {
			if (s == NULL)
				s = "The passwd file is busy,";
			else
				s = "The passwd file is still busy,";
		} else
			s = "Unable to open passwd temp file,";
		(void)fprintf(stderr,
		    "%s do you want to wait until it is available? [y/n] ", s);
		(void)signal(SIGINT, kbintr);
		c = getchar();
		(void)signal(SIGINT, SIG_IGN);
		if (c != '\n')
			while ((d = getchar()) != '\n' && d != EOF)
				;
		if (tolower(c) != 'y') {
			printf("Password unchanged\n");
			exit(1);
		}
	}
	pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
	if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1)
		pw_error(_PATH_MASTERPASSWD, 1, 1);

	/* Update master.passwd file and rebuild spwd.db. */
	pw_copy(pfd, tfd, pw);
	if (pw_mkdb(uname, pwflags) < 0)
		pw_error(NULL, 0, 1);

	return(0);
}

char *
getnewpasswd(pw, lc, authenticated)
	struct passwd *pw;
	login_cap_t *lc;
	int authenticated;
{
	register char *p;
	int tries, pwd_tries;
	char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN];

	if (!authenticated) {
		(void)printf("Changing local password for %s.\n", pw->pw_name);
		if (uid && pw->pw_passwd[0] &&
		    strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
		    pw->pw_passwd)) {
			errno = EACCES;
			pw_error(NULL, 1, 1);
		}
	}
	
	pwd_tries = pwd_gettries(pw, lc);

	for (buf[0] = '\0', tries = 0;;) {
		p = getpass("New password:");
		if (!*p) {
			(void)printf("Password unchanged.\n");
			pw_error(NULL, 0, 0);
		}
		if (strcmp(p, "s/key") == 0) {
			printf("That password collides with a system feature. Choose another.\n");
			continue;
		}
		
		if ((tries++ < pwd_tries || pwd_tries == 0) 
		    && pwd_check(pw, lc, p) == 0)
			continue;
		strlcpy(buf, p, sizeof(buf));
		if (!strcmp(buf, getpass("Retype new password:")))
			break;
		(void)printf("Mismatch; try again, EOF to quit.\n");
	}
	if (!pwd_gensalt(salt, _PASSWORD_LEN, pw, lc, 'l')) {
		(void)printf("Couldn't generate salt.\n");
		pw_error(NULL, 0, 0);
	}
	return(crypt(buf, salt));
}

void
kbintr(signo)
	int signo;
{
	char msg[] = "\nPassword unchanged\n";

	write(STDOUT_FILENO, msg, sizeof(msg) - 1);
	_exit(1);
}