324332f31f
or pam, to ease IT audit guideline compliance. Patch from Richard Hansen of BBN in private mail. Proposed on tech-kern with positive comments, except a suggestion I didn't implement: A possible future enhancement is refraining from logging if the old password is empty, as some people abort password changing that way. However, it's not clear if this complies with most guidelines that require password change logging, and at first glance that appears to be a fairly difficult change.
342 lines
7.9 KiB
C
342 lines
7.9 KiB
C
/* $NetBSD: local_passwd.c,v 1.34 2010/03/02 16:19:13 gdt 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 1.34 2010/03/02 16:19:13 gdt 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((char *)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(progname)
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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()
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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()
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{
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/* NOOP */
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}
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int
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local_chpw(uname)
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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((char *)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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