24fe7ba0d9
- add __unused where appropriate
- PAM_RETURN -> return since OpenPAM already logs the return value.
- make PAM_LOG use openpam_log()
- make PAM_VERBOSE_ERROR use openpam_get_option() and check flags
for PAM_SILENT
- remove dummy functions since OpenPAM handles missing service
functions
- fix various warnings
Sponsored by: DARPA, NAI Labs
298 lines
8.0 KiB
C
298 lines
8.0 KiB
C
/*-
|
|
* Copyright 1998 Juniper Networks, Inc.
|
|
* All rights reserved.
|
|
* Copyright (c) 2001,2002 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/param.h>
|
|
|
|
#include <pwd.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <taclib.h>
|
|
#include <unistd.h>
|
|
|
|
#define PAM_SM_AUTH
|
|
|
|
#include <security/pam_appl.h>
|
|
#include <security/pam_modules.h>
|
|
#include <security/pam_mod_misc.h>
|
|
|
|
enum {
|
|
PAM_OPT_CONF = PAM_OPT_STD_MAX,
|
|
PAM_OPT_TEMPLATE_USER
|
|
};
|
|
|
|
static struct opttab other_options[] = {
|
|
{ "conf", PAM_OPT_CONF },
|
|
{ "template_user", PAM_OPT_TEMPLATE_USER },
|
|
{ NULL, 0 }
|
|
};
|
|
|
|
typedef int (*set_func)(struct tac_handle *, const char *);
|
|
|
|
static int do_item(pam_handle_t *, struct tac_handle *, int,
|
|
set_func, const char *);
|
|
static char *get_msg(struct tac_handle *);
|
|
static int set_msg(struct tac_handle *, const char *);
|
|
|
|
static int
|
|
do_item(pam_handle_t *pamh, struct tac_handle *tach, int item,
|
|
set_func func, const char *funcname)
|
|
{
|
|
int retval;
|
|
const void *value;
|
|
|
|
retval = pam_get_item(pamh, item, &value);
|
|
if (retval != PAM_SUCCESS)
|
|
return retval;
|
|
if (value != NULL && (*func)(tach, (const char *)value) == -1) {
|
|
syslog(LOG_CRIT, "%s: %s", funcname, tac_strerror(tach));
|
|
tac_close(tach);
|
|
return PAM_SERVICE_ERR;
|
|
}
|
|
return PAM_SUCCESS;
|
|
}
|
|
|
|
static char *
|
|
get_msg(struct tac_handle *tach)
|
|
{
|
|
char *msg;
|
|
|
|
msg = tac_get_msg(tach);
|
|
if (msg == NULL) {
|
|
syslog(LOG_CRIT, "tac_get_msg: %s", tac_strerror(tach));
|
|
tac_close(tach);
|
|
return NULL;
|
|
}
|
|
return msg;
|
|
}
|
|
|
|
static int
|
|
set_msg(struct tac_handle *tach, const char *msg)
|
|
{
|
|
if (tac_set_msg(tach, msg) == -1) {
|
|
syslog(LOG_CRIT, "tac_set_msg: %s", tac_strerror(tach));
|
|
tac_close(tach);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
PAM_EXTERN int
|
|
pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
|
|
int argc, const char *argv[])
|
|
{
|
|
struct options options;
|
|
int retval;
|
|
struct tac_handle *tach;
|
|
char *conf_file;
|
|
char *template_user;
|
|
|
|
pam_std_option(&options, other_options, argc, argv);
|
|
|
|
PAM_LOG("Options processed");
|
|
|
|
conf_file = NULL;
|
|
pam_test_option(&options, PAM_OPT_CONF, &conf_file);
|
|
template_user = NULL;
|
|
pam_test_option(&options, PAM_OPT_TEMPLATE_USER, &template_user);
|
|
|
|
tach = tac_open();
|
|
if (tach == NULL) {
|
|
syslog(LOG_CRIT, "tac_open failed");
|
|
return (PAM_SERVICE_ERR);
|
|
}
|
|
if (tac_config(tach, conf_file) == -1) {
|
|
syslog(LOG_ALERT, "tac_config: %s", tac_strerror(tach));
|
|
tac_close(tach);
|
|
return (PAM_SERVICE_ERR);
|
|
}
|
|
if (tac_create_authen(tach, TAC_AUTHEN_LOGIN, TAC_AUTHEN_TYPE_ASCII,
|
|
TAC_AUTHEN_SVC_LOGIN) == -1) {
|
|
syslog(LOG_CRIT, "tac_create_authen: %s", tac_strerror(tach));
|
|
tac_close(tach);
|
|
return (PAM_SERVICE_ERR);
|
|
}
|
|
|
|
PAM_LOG("Done tac_open() ... tac_close()");
|
|
|
|
retval = do_item(pamh, tach, PAM_USER, tac_set_user, "tac_set_user");
|
|
if (retval != PAM_SUCCESS)
|
|
return (retval);
|
|
|
|
PAM_LOG("Done user");
|
|
|
|
retval = do_item(pamh, tach, PAM_TTY, tac_set_port, "tac_set_port");
|
|
if (retval != PAM_SUCCESS)
|
|
return (retval);
|
|
|
|
PAM_LOG("Done tty");
|
|
|
|
retval = do_item(pamh, tach, PAM_RHOST, tac_set_rem_addr,
|
|
"tac_set_rem_addr");
|
|
if (retval != PAM_SUCCESS)
|
|
return (retval);
|
|
|
|
for (;;) {
|
|
char *srvr_msg;
|
|
size_t msg_len;
|
|
const char *user_msg;
|
|
char *data_msg;
|
|
int sflags;
|
|
int status;
|
|
|
|
sflags = tac_send_authen(tach);
|
|
if (sflags == -1) {
|
|
syslog(LOG_CRIT, "tac_send_authen: %s",
|
|
tac_strerror(tach));
|
|
tac_close(tach);
|
|
return (PAM_AUTHINFO_UNAVAIL);
|
|
}
|
|
status = TAC_AUTHEN_STATUS(sflags);
|
|
if (!TAC_AUTHEN_NOECHO(sflags))
|
|
pam_set_option(&options, PAM_OPT_ECHO_PASS);
|
|
switch (status) {
|
|
|
|
case TAC_AUTHEN_STATUS_PASS:
|
|
tac_close(tach);
|
|
if (template_user != NULL) {
|
|
const void *item;
|
|
const char *user;
|
|
|
|
PAM_LOG("Trying template user: %s",
|
|
template_user);
|
|
|
|
/*
|
|
* If the given user name doesn't exist in
|
|
* the local password database, change it
|
|
* to the value given in the "template_user"
|
|
* option.
|
|
*/
|
|
retval = pam_get_item(pamh, PAM_USER, &item);
|
|
if (retval != PAM_SUCCESS)
|
|
return (retval);
|
|
user = (const char *)item;
|
|
if (getpwnam(user) == NULL) {
|
|
pam_set_item(pamh, PAM_USER,
|
|
template_user);
|
|
PAM_LOG("Using template user");
|
|
}
|
|
}
|
|
return (PAM_SUCCESS);
|
|
|
|
case TAC_AUTHEN_STATUS_FAIL:
|
|
tac_close(tach);
|
|
PAM_VERBOSE_ERROR("TACACS+ authentication failed");
|
|
return (PAM_AUTH_ERR);
|
|
|
|
case TAC_AUTHEN_STATUS_GETUSER:
|
|
case TAC_AUTHEN_STATUS_GETPASS:
|
|
if ((srvr_msg = get_msg(tach)) == NULL)
|
|
return (PAM_SERVICE_ERR);
|
|
if (status == TAC_AUTHEN_STATUS_GETUSER)
|
|
retval = pam_get_user(pamh, &user_msg,
|
|
*srvr_msg ? srvr_msg : NULL);
|
|
else if (status == TAC_AUTHEN_STATUS_GETPASS)
|
|
retval = pam_get_authtok(pamh,
|
|
PAM_AUTHTOK, &user_msg,
|
|
*srvr_msg ? srvr_msg : "Password:");
|
|
free(srvr_msg);
|
|
if (retval != PAM_SUCCESS) {
|
|
/* XXX - send a TACACS+ abort packet */
|
|
tac_close(tach);
|
|
return (retval);
|
|
}
|
|
if (set_msg(tach, user_msg) == -1)
|
|
return (PAM_SERVICE_ERR);
|
|
break;
|
|
|
|
case TAC_AUTHEN_STATUS_GETDATA:
|
|
if ((srvr_msg = get_msg(tach)) == NULL)
|
|
return (PAM_SERVICE_ERR);
|
|
retval = pam_prompt(pamh,
|
|
pam_test_option(&options, PAM_OPT_ECHO_PASS, NULL)
|
|
? PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF,
|
|
&data_msg, "%s", *srvr_msg ? srvr_msg : "Data:");
|
|
free(srvr_msg);
|
|
if (retval != PAM_SUCCESS) {
|
|
/* XXX - send a TACACS+ abort packet */
|
|
tac_close(tach);
|
|
return (retval);
|
|
}
|
|
retval = set_msg(tach, data_msg);
|
|
memset(data_msg, 0, strlen(data_msg));
|
|
free(data_msg);
|
|
if (retval == -1)
|
|
return (PAM_SERVICE_ERR);
|
|
break;
|
|
|
|
case TAC_AUTHEN_STATUS_ERROR:
|
|
srvr_msg = (char *)tac_get_data(tach, &msg_len);
|
|
if (srvr_msg != NULL && msg_len != 0) {
|
|
syslog(LOG_CRIT, "tac_send_authen:"
|
|
" server detected error: %s", srvr_msg);
|
|
free(srvr_msg);
|
|
}
|
|
else
|
|
syslog(LOG_CRIT,
|
|
"tac_send_authen: server detected error");
|
|
tac_close(tach);
|
|
return (PAM_AUTHINFO_UNAVAIL);
|
|
break;
|
|
|
|
case TAC_AUTHEN_STATUS_RESTART:
|
|
case TAC_AUTHEN_STATUS_FOLLOW:
|
|
default:
|
|
syslog(LOG_CRIT,
|
|
"tac_send_authen: unexpected status %#x", status);
|
|
tac_close(tach);
|
|
return (PAM_AUTHINFO_UNAVAIL);
|
|
}
|
|
}
|
|
}
|
|
|
|
PAM_EXTERN int
|
|
pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
|
|
int argc __unused, const char *argv[] __unused)
|
|
{
|
|
|
|
return (PAM_IGNORE);
|
|
}
|
|
|
|
PAM_MODULE_ENTRY("pam_tacplus");
|