129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
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*
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* Copyright (C) 2016 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <config.h>
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#include <unistd.h>
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#include <security/_pam_macros.h>
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#include <security/pam_ext.h>
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#include <security/pam_misc.h>
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#include <security/pam_modules.h>
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#include <security/pam_modutil.h>
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#ifdef HAVE_KEYUTILS
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#include <keyutils.h>
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#endif
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int
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pam_sm_authenticate (pam_handle_t *pamh,
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int flags,
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int argc,
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const char **argv)
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{
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#ifdef HAVE_KEYUTILS
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long r;
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size_t cached_passwords_length;
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void *cached_passwords = NULL;
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char *last_cached_password = NULL;
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key_serial_t serial;
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size_t i;
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serial = find_key_by_type_and_desc ("user", "cryptsetup", 0);
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if (serial == 0)
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return PAM_AUTHINFO_UNAVAIL;
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r = keyctl_read_alloc (serial, &cached_passwords);
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if (r < 0)
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return PAM_AUTHINFO_UNAVAIL;
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cached_passwords_length = r;
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/*
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Find the last password in the NUL-separated list of passwords.
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Multiple passwords are returned either when the user enters an
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incorrect password or there are multiple encrypted drives.
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In the case of an incorrect password the last one is correct.
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In the case of multiple drives, choosing the last drive is as
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arbitrary a choice as any other, but choosing the last password at
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least supports multiple attempts on the last drive.
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*/
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last_cached_password = cached_passwords;
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for (i = 0; i < cached_passwords_length; i++) {
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last_cached_password = ((char *) cached_passwords) + i;
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i += strlen (last_cached_password);
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}
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r = pam_set_item (pamh, PAM_AUTHTOK, last_cached_password);
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free (cached_passwords);
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if (r < 0)
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return PAM_AUTH_ERR;
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else
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return PAM_SUCCESS;
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#endif
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return PAM_AUTHINFO_UNAVAIL;
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}
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int
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pam_sm_setcred (pam_handle_t *pamh,
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int flags,
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int argc,
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const char **argv)
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{
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return PAM_SUCCESS;
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}
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int
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pam_sm_acct_mgmt (pam_handle_t *pamh,
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int flags,
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int argc,
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const char **argv)
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{
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return PAM_SUCCESS;
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}
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int
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pam_sm_chauthtok (pam_handle_t *pamh,
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int flags,
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int argc,
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const char **argv)
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{
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return PAM_SUCCESS;
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}
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int
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pam_sm_open_session (pam_handle_t *pamh,
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int flags,
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int argc,
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const char **argv)
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{
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return PAM_SUCCESS;
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}
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int
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pam_sm_close_session (pam_handle_t *pamh,
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int flags,
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int argc,
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const char **argv)
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{
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return PAM_SUCCESS;
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}
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