339 lines
7.9 KiB
C
339 lines
7.9 KiB
C
/* $NetBSD: local_passwd.c,v 1.36 2012/03/25 05:55:07 dholland Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
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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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "from: @(#)local_passwd.c 8.3 (Berkeley) 4/2/94";
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#else
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__RCSID("$NetBSD: local_passwd.c,v 1.36 2012/03/25 05:55:07 dholland Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <ctype.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 <pwd.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 <limits.h>
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#include <time.h>
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#include <unistd.h>
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#include <util.h>
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#include <login_cap.h>
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#include <syslog.h>
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#include "extern.h"
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static uid_t uid;
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static char *
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getnewpasswd(struct passwd *pw, int min_pw_len)
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{
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int tries;
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char *p, *t;
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char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN+1];
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char option[LINE_MAX], *key, *opt;
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(void)printf("Changing local password for %s.\n", pw->pw_name);
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if (uid && pw->pw_passwd[0] &&
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strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
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pw->pw_passwd)) {
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errno = EACCES;
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syslog(LOG_AUTH | LOG_NOTICE,
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"user %s (UID %lu) failed to change the "
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"local password of user %s: %m",
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pw->pw_name, (unsigned long)uid, pw->pw_name);
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pw_error(NULL, 1, 1);
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}
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for (buf[0] = '\0', tries = 0;;) {
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p = getpass("New password:");
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if (!*p) {
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(void)printf("Password unchanged.\n");
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pw_error(NULL, 0, 0);
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}
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if (min_pw_len > 0 && (int)strlen(p) < min_pw_len) {
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(void) printf("Password is too short.\n");
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continue;
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}
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if (strlen(p) <= 5 && ++tries < 2) {
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(void)printf("Please enter a longer password.\n");
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continue;
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}
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for (t = p; *t && islower((unsigned char)*t); ++t);
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if (!*t && ++tries < 2) {
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(void)printf("Please don't use an all-lower case "
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"password.\nUnusual capitalization, "
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"control characters or digits are "
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"suggested.\n");
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continue;
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}
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(void)strlcpy(buf, p, sizeof(buf));
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if (!strcmp(buf, getpass("Retype new password:")))
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break;
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(void)printf("Mismatch; try again, EOF to quit.\n");
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}
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pw_getpwconf(option, sizeof(option), pw, "localcipher");
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opt = option;
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key = strsep(&opt, ",");
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if(pw_gensalt(salt, _PASSWORD_LEN, key, opt) == -1) {
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warn("Couldn't generate salt");
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pw_error(NULL, 0, 0);
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}
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return(crypt(buf, salt));
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}
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#ifdef USE_PAM
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void
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pwlocal_usage(const char *prefix)
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{
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(void) fprintf(stderr, "%s %s [-d files | -l] [user]\n",
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prefix, getprogname());
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}
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void
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pwlocal_process(const char *username, int argc, char **argv)
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{
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struct passwd *pw;
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struct passwd old_pw;
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time_t old_change;
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int pfd, tfd;
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int min_pw_len = 0;
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int pw_expiry = 0;
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int ch;
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#ifdef LOGIN_CAP
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login_cap_t *lc;
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#endif
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while ((ch = getopt(argc, argv, "l")) != -1) {
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switch (ch) {
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case 'l':
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/*
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* Aborb the -l that may have gotten us here.
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*/
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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switch (argc) {
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case 0:
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/* username already provided */
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break;
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case 1:
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username = argv[0];
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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if (!(pw = getpwnam(username)))
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errx(1, "unknown user %s", username);
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uid = getuid();
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if (uid && uid != pw->pw_uid)
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errx(1, "%s", strerror(EACCES));
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/* Save the old pw information for comparing on pw_copy(). */
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old_pw = *pw;
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/*
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* Get class restrictions for this user, then get the new password.
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*/
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#ifdef LOGIN_CAP
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if((lc = login_getclass(pw->pw_class)) != NULL) {
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min_pw_len = (int) login_getcapnum(lc, "minpasswordlen", 0, 0);
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pw_expiry = (int) login_getcaptime(lc, "passwordtime", 0, 0);
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login_close(lc);
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}
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#endif
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pw->pw_passwd = getnewpasswd(pw, min_pw_len);
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old_change = pw->pw_change;
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pw->pw_change = pw_expiry ? pw_expiry + time(NULL) : 0;
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/*
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* Now that the user has given us a new password, let us
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* change the database.
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*/
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pw_init();
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tfd = pw_lock(0);
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if (tfd < 0) {
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warnx ("The passwd file is busy, waiting...");
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tfd = pw_lock(10);
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if (tfd < 0)
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errx(1, "The passwd file is still busy, "
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"try again later.");
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}
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pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
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if (pfd < 0)
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pw_error(_PATH_MASTERPASSWD, 1, 1);
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pw_copy(pfd, tfd, pw, &old_pw);
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if (pw_mkdb(username, old_change == pw->pw_change) < 0)
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pw_error(NULL, 0, 1);
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syslog(LOG_AUTH | LOG_INFO,
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"user %s (UID %lu) successfully changed "
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"the local password of user %s",
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uid ? username : "root", (unsigned long)uid, username);
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}
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#else /* ! USE_PAM */
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static int force_local;
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int
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local_init(const char *progname)
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{
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force_local = 0;
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return (0);
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}
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int
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local_arg(char ch, const char *arg)
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{
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switch (ch) {
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case 'l':
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force_local = 1;
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break;
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default:
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return(0);
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}
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return(1);
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}
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int
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local_arg_end(void)
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{
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if (force_local)
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return(PW_USE_FORCE);
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return(PW_USE);
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}
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void
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local_end(void)
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{
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/* NOOP */
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}
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int
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local_chpw(const char *uname)
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{
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struct passwd *pw;
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struct passwd old_pw;
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time_t old_change;
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int pfd, tfd;
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int min_pw_len = 0;
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int pw_expiry = 0;
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#ifdef LOGIN_CAP
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login_cap_t *lc;
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#endif
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if (!(pw = getpwnam(uname))) {
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warnx("unknown user %s", uname);
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return (1);
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}
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uid = getuid();
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if (uid && uid != pw->pw_uid) {
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warnx("%s", strerror(EACCES));
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return (1);
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}
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/* Save the old pw information for comparing on pw_copy(). */
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old_pw = *pw;
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/*
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* Get class restrictions for this user, then get the new password.
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*/
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#ifdef LOGIN_CAP
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if((lc = login_getclass(pw->pw_class))) {
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min_pw_len = (int) login_getcapnum(lc, "minpasswordlen", 0, 0);
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pw_expiry = (int) login_getcaptime(lc, "passwordtime", 0, 0);
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login_close(lc);
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}
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#endif
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pw->pw_passwd = getnewpasswd(pw, min_pw_len);
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old_change = pw->pw_change;
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pw->pw_change = pw_expiry ? pw_expiry + time(NULL) : 0;
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/*
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* Now that the user has given us a new password, let us
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* change the database.
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*/
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pw_init();
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tfd = pw_lock(0);
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if (tfd < 0) {
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warnx ("The passwd file is busy, waiting...");
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tfd = pw_lock(10);
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if (tfd < 0)
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errx(1, "The passwd file is still busy, "
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"try again later.");
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}
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pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
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if (pfd < 0)
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pw_error(_PATH_MASTERPASSWD, 1, 1);
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pw_copy(pfd, tfd, pw, &old_pw);
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if (pw_mkdb(uname, old_change == pw->pw_change) < 0)
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pw_error(NULL, 0, 1);
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syslog(LOG_AUTH | LOG_INFO,
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"user %s (UID %lu) successfully changed "
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"the local password of user %s",
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uid ? uname : "root", (unsigned long)uid, uname);
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return (0);
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}
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#endif /* USE_PAM */
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