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/*-
* Copyright 2000 James Bloom
* All rights reserved.
* Based upon code Copyright 1998 Juniper Networks, Inc.
* Copyright (c) 2001-2003 Networks Associates Technology, Inc.
* All rights reserved.
*
* Portions of this software were developed for the FreeBSD Project by
* ThinkSec AS and NAI Labs, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <opie.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define PAM_SM_AUTH
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/pam_mod_misc.h>
#define PAM_OPT_NO_FAKE_PROMPTS "no_fake_prompts"
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
struct opie opie;
struct passwd *pwd;
int retval, i;
const char *(promptstr[]) = { "%s\nPassword: ", "%s\nPassword [echo on]: "};
char challenge[OPIE_CHALLENGE_MAX];
char principal[OPIE_PRINCIPAL_MAX];
const char *user;
char *response;
int style;
user = NULL;
if (openpam_get_option(pamh, PAM_OPT_AUTH_AS_SELF)) {
if ((pwd = getpwnam(getlogin())) == NULL)
return (PAM_AUTH_ERR);
user = pwd->pw_name;
}
else {
retval = pam_get_user(pamh, &user, NULL);
if (retval != PAM_SUCCESS)
return (retval);
}
PAM_LOG("Got user: %s", user);
/*
* Watch out: libopie feels entitled to truncate the user name
* passed to it if it's longer than OPIE_PRINCIPAL_MAX, which is
* not uncommon in Windows environments.
*/
if (strlen(user) >= sizeof(principal))
return (PAM_AUTH_ERR);
strlcpy(principal, user, sizeof(principal));
/*
* Don't call the OPIE atexit() handler when our program exits,
* since the module has been unloaded and we will SEGV.
*/
opiedisableaeh();
/*
* If the no_fake_prompts option was given, and the user
* doesn't have an OPIE key, just fail rather than present the
* user with a bogus OPIE challenge.
*/
if (opiechallenge(&opie, principal, challenge) != 0 &&
openpam_get_option(pamh, PAM_OPT_NO_FAKE_PROMPTS))
return (PAM_AUTH_ERR);
/*
* It doesn't make sense to use a password that has already been
* typed in, since we haven't presented the challenge to the user
* yet, so clear the stored password.
*/
pam_set_item(pamh, PAM_AUTHTOK, NULL);
style = PAM_PROMPT_ECHO_OFF;
for (i = 0; i < 2; i++) {
retval = pam_prompt(pamh, style, &response,
promptstr[i], challenge);
if (retval != PAM_SUCCESS) {
opieunlock();
return (retval);
}
PAM_LOG("Completed challenge %d: %s", i, response);
if (response[0] != '\0')
break;
/* Second time round, echo the password */
style = PAM_PROMPT_ECHO_ON;
}
pam_set_item(pamh, PAM_AUTHTOK, response);
/*
* Opieverify is supposed to return -1 only if an error occurs.
* But it returns -1 even if the response string isn't in the form
* it expects. Thus we can't log an error and can only check for
* success or lack thereof.
*/
retval = opieverify(&opie, response);
free(response);
return (retval == 0 ? PAM_SUCCESS : PAM_AUTH_ERR);
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
return (PAM_SUCCESS);
}
PAM_MODULE_ENTRY("pam_opie");
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