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/*
* Copyright (c) 2008-2010 Moxie Marlinspike
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <boost/lexical_cast.hpp>
#include <string.h>
#include <stdint.h>
#include <string>
#include <unistd.h>
#include <security/pam_modules.h>
#include <security/pam_ext.h>
#include <syslog.h>
#include "HOTPCredentials.h"
#include "HOTPWindow.h"
#define DEFAULT_PATH "/etc/barada.d/"
#undef DEBUG
using namespace std;
using namespace boost;
static int need_username (pam_handle_t *pamh, char **name)
{
const void *void_name;
int retval;
retval = pam_get_item(pamh, PAM_USER, &void_name);
if (retval != PAM_SUCCESS || void_name == NULL) {
return 1;
} else {
*name = strdup((char*)void_name);
return 0;
}
}
static int need_password (pam_handle_t *pamh, char **password)
{
const void *void_pass;
int retval;
retval = pam_get_item (pamh, PAM_AUTHTOK, &void_pass);
if (retval != PAM_SUCCESS || void_pass == NULL) {
return 1;
}
*password = strdup((char*)void_pass);
return 0;
}
static string getLogin(pam_handle_t *pamh) {
char *login=NULL;
if (need_username(pamh, &login)) {
pam_prompt(pamh, PAM_PROMPT_ECHO_ON, &login, "login: ");
}
if (login != NULL) {
pam_set_item(pamh, PAM_USER, login);
string loginString(login);
free(login);
return loginString;
}
return "";
}
static uint32_t getPasscode(pam_handle_t *pamh) {
char *password=NULL;
if (need_password(pamh, &password)) {
pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &password, "Password: ");
}
if (password != NULL) {
pam_set_item(pamh, PAM_AUTHTOK, password);
string passwordString(password);
free(password);
try {
return lexical_cast<uint32_t>(passwordString);
} catch (bad_lexical_cast &exception) {
return 0;
}
}
return 0;
}
int pam_sm_authenticate(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
string login;
uint32_t passcode;
uint64_t counter;
if ((login = getLogin(pamh)) == "") {
#ifdef DEBUG
pam_syslog(pamh, LOG_EMERG, "HOTP: Unable To Get Login...");
#endif
return PAM_USER_UNKNOWN;
} else if (login == "..") {
return PAM_USER_UNKNOWN;
}
#ifdef DEBUG
pam_syslog(pamh, LOG_EMERG, ("Got Login: " + login).c_str());
#endif
if ((passcode = getPasscode(pamh)) == 0) {
#ifdef DEBUG
pam_syslog(pamh, LOG_EMERG, "HOTP: Unable To Get Passcode...");
#endif
return PAM_AUTH_ERR;
}
#ifdef DEBUG
pam_syslog(pamh, LOG_EMERG, "Got Passcode: %d", passcode);
#endif
HOTPCredentials user(pamh, DEFAULT_PATH + login);
HOTPWindow userWindow(pamh, 20, user);
#ifdef DEBUG
pam_syslog(pamh, LOG_EMERG, "Checking HOTP Window For User...");
#endif
if ((counter = userWindow.verify(passcode))) {
user.setCounter(counter+1);
user.serializeCounter(DEFAULT_PATH + login);
pam_syslog(pamh, LOG_NOTICE, "pam_barada: authentication successful for %s\n", login.c_str());
return PAM_SUCCESS;
} else {
return PAM_AUTH_ERR;
}
}
int pam_sm_setcred(
pam_handle_t *pamh,
int flags,
int argc,
const char **argv
){ return PAM_CRED_UNAVAIL; }
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