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/*-
* Copyright 1998 Juniper Networks, Inc.
* All rights reserved.
*
* 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.
*
* 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/time.h>
#include <login_cap.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#define PAM_SM_AUTH
#define PAM_SM_ACCOUNT
#include <security/pam_modules.h>
#include "pam_mod_misc.h"
#define PASSWORD_PROMPT "Password:"
#define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
enum { PAM_OPT_AUTH_AS_SELF=PAM_OPT_STD_MAX, PAM_OPT_NULLOK };
static struct opttab other_options[] = {
{ "auth_as_self", PAM_OPT_AUTH_AS_SELF },
{ "nullok", PAM_OPT_NULLOK },
{ NULL, 0 }
};
/*
* authentication management
*/
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct options options;
struct passwd *pwd;
int retval;
const char *password, *user;
char *encrypted;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
if (pam_test_option(&options, PAM_OPT_AUTH_AS_SELF, NULL))
pwd = getpwuid(getuid());
else {
retval = pam_get_user(pamh, &user, NULL);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
pwd = getpwnam(user);
}
PAM_LOG("Got user: %s", user);
if (pwd != NULL) {
PAM_LOG("Doing real authentication");
if (pwd->pw_passwd[0] == '\0'
&& pam_test_option(&options, PAM_OPT_NULLOK, NULL)) {
/*
* No password case. XXX Are we giving too much away
* by not prompting for a password?
*/
PAM_LOG("No password, and null password OK");
PAM_RETURN(PAM_SUCCESS);
}
else {
retval = pam_get_pass(pamh, &password, PASSWORD_PROMPT,
&options);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Got password");
}
encrypted = crypt(password, pwd->pw_passwd);
if (password[0] == '\0' && pwd->pw_passwd[0] != '\0')
encrypted = ":";
PAM_LOG("Encrypted passwords are: %s & %s", encrypted,
pwd->pw_passwd);
retval = strcmp(encrypted, pwd->pw_passwd) == 0 ?
PAM_SUCCESS : PAM_AUTH_ERR;
}
else {
PAM_LOG("Doing dummy authentication");
/*
* User unknown.
* Encrypt a dummy password so as to not give away too much.
*/
retval = pam_get_pass(pamh, &password, PASSWORD_PROMPT,
&options);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Got password");
crypt(password, "xx");
retval = PAM_AUTH_ERR;
}
/*
* The PAM infrastructure will obliterate the cleartext
* password before returning to the application.
*/
PAM_RETURN(retval);
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
return PAM_SUCCESS;
}
/*
* account management
*
* check pw_change and pw_expire fields
*/
PAM_EXTERN
int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct options options;
struct passwd *pw;
struct timeval tp;
login_cap_t *lc;
time_t warntime;
int retval;
const char *user;
char buf[128];
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
retval = pam_get_item(pamh, PAM_USER, (const void **)&user);
if (retval != PAM_SUCCESS || user == NULL)
/* some implementations return PAM_SUCCESS here */
PAM_RETURN(PAM_USER_UNKNOWN);
pw = getpwnam(user);
if (pw == NULL)
PAM_RETURN(PAM_USER_UNKNOWN);
PAM_LOG("Got user: %s", user);
retval = PAM_SUCCESS;
lc = login_getpwclass(pw);
if (pw->pw_change || pw->pw_expire)
gettimeofday(&tp, NULL);
warntime = login_getcaptime(lc, "warnpassword", DEFAULT_WARN,
DEFAULT_WARN);
PAM_LOG("Got login_cap");
if (pw->pw_change) {
if (tp.tv_sec >= pw->pw_change)
/* some implementations return PAM_AUTHTOK_EXPIRED */
retval = PAM_NEW_AUTHTOK_REQD;
else if (pw->pw_change - tp.tv_sec < warntime) {
snprintf(buf, sizeof(buf),
"Warning: your password expires on %s",
ctime(&pw->pw_change));
pam_prompt(pamh, PAM_ERROR_MSG, buf, NULL);
}
}
warntime = login_getcaptime(lc, "warnexpire", DEFAULT_WARN,
DEFAULT_WARN);
if (pw->pw_expire) {
if (tp.tv_sec >= pw->pw_expire)
retval = PAM_ACCT_EXPIRED;
else if (pw->pw_expire - tp.tv_sec < warntime) {
snprintf(buf, sizeof(buf),
"Warning: your account expires on %s",
ctime(&pw->pw_expire));
pam_prompt(pamh, PAM_ERROR_MSG, buf, NULL);
}
}
login_close(lc);
PAM_RETURN(retval);
}
PAM_MODULE_ENTRY("pam_unix");
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