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.
148 lines
4.4 KiB
C
148 lines
4.4 KiB
C
/* $NetBSD: pam_passwd.c,v 1.5 2010/03/02 16:19:13 gdt Exp $ */
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/*-
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* Copyright (c) 2002 Networks Associates Technologies, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by ThinkSec AS and
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* NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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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. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#ifdef __FreeBSD__
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__FBSDID("$FreeBSD: src/usr.bin/passwd/passwd.c,v 1.23 2003/04/18 21:27:09 nectar Exp $");
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#else
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__RCSID("$NetBSD: pam_passwd.c,v 1.5 2010/03/02 16:19:13 gdt Exp $");
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#endif
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#include <sys/param.h>
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#include <err.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 <syslog.h>
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#include <unistd.h>
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#include "extern.h"
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#include <security/pam_appl.h>
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#include <security/openpam.h>
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static pam_handle_t *pamh;
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static struct pam_conv pamc = {
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openpam_ttyconv,
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NULL
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};
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#define pam_check(msg) \
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do { \
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if (pam_err != PAM_SUCCESS) { \
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warnx("%s: %s", (msg), pam_strerror(pamh, pam_err)); \
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goto end; \
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} \
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} while (/*CONSTCOND*/0)
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void
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pwpam_process(const char *username, int argc, char **argv)
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{
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int ch, pam_err;
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char hostname[MAXHOSTNAMELEN + 1];
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/* details about the invoking user for logging */
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const uid_t i_uid = getuid();
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const struct passwd *const i_pwd = getpwuid(i_uid);
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const char *const i_username = (i_pwd && i_pwd->pw_name)
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? i_pwd->pw_name : "(null)";
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while ((ch = getopt(argc, argv, "")) != -1) {
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switch (ch) {
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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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(void)printf("Changing password for %s.\n", username);
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/* initialize PAM -- always use the program name "passwd" */
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pam_err = pam_start("passwd", username, &pamc, &pamh);
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pam_check("unable to start PAM session");
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pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO));
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pam_check("unable to set TTY");
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(void)gethostname(hostname, sizeof hostname);
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pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
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pam_check("unable to set RHOST");
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pam_err = pam_set_item(pamh, PAM_RUSER, getlogin());
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pam_check("unable to set RUSER");
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/* set new password */
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pam_err = pam_chauthtok(pamh, 0);
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if (pam_err != PAM_SUCCESS) {
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if (pam_err == PAM_PERM_DENIED) {
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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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"PAM authentication token of user %s: %s",
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i_username, (unsigned long)i_uid, username,
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pam_strerror(pamh, pam_err));
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}
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printf("Unable to change auth token: %s\n",
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pam_strerror(pamh, pam_err));
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} else {
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syslog(LOG_AUTH | LOG_INFO,
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"user %s (UID %lu) successfully changed the "
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"PAM authentication token of user %s",
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i_username, (unsigned long)i_uid, username);
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}
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end:
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pam_end(pamh, pam_err);
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if (pam_err == PAM_SUCCESS)
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return;
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exit(1);
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}
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