150 lines
4.5 KiB
C
150 lines
4.5 KiB
C
/* $NetBSD: pam_passwd.c,v 1.6 2010/03/09 16:14:08 joerg 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 1.6 2010/03/09 16:14:08 joerg 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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if (pam_err != PAM_SUCCESS)
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errx(1, "unable to start PAM session: %s",
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pam_strerror(NULL, pam_err));
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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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