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/* Unix NT password database implementation, version 0.7.5.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/* indicate the following groups are defined */
#define PAM_SM_AUTH
#include "includes.h"
#include "debug.h"
#ifndef LINUX
/* This is only used in the Sun implementation. */
#if defined(HAVE_SECURITY_PAM_APPL_H)
#include <security/pam_appl.h>
#elif defined(HAVE_PAM_PAM_APPL_H)
#include <pam/pam_appl.h>
#endif
#endif /* LINUX */
#if defined(HAVE_SECURITY_PAM_MODULES_H)
#include <security/pam_modules.h>
#elif defined(HAVE_PAM_PAM_MODULES_H)
#include <pam/pam_modules.h>
#endif
#include "general.h"
#include "support.h"
#define AUTH_RETURN \
do { \
/* Restore application signal handler */ \
CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler); \
if(ret_data) { \
*ret_data = retval; \
pam_set_data( pamh, "smb_setcred_return" \
, (void *) ret_data, NULL ); \
} \
return retval; \
} while (0)
static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
const char *name, struct samu *sampass, bool exist);
/*
* pam_sm_authenticate() authenticates users against the samba password file.
*
* First, obtain the password from the user. Then use a
* routine in 'support.c' to authenticate the user.
*/
#define _SMB_AUTHTOK "-SMB-PASS"
int pam_sm_authenticate(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
unsigned int ctrl;
int retval, *ret_data = NULL;
struct samu *sampass = NULL;
extern bool in_client;
const char *name;
void (*oldsig_handler)(int) = NULL;
bool found;
/* Points to memory managed by the PAM library. Do not free. */
char *p = NULL;
/* Samba initialization. */
load_case_tables();
setup_logging("pam_smbpass",False);
in_client = True;
ctrl = set_ctrl(flags, argc, argv);
/* Get a few bytes so we can pass our return value to
pam_sm_setcred(). */
ret_data = SMB_MALLOC_P(int);
/* we need to do this before we call AUTH_RETURN */
/* Getting into places that might use LDAP -- protect the app
from a SIGPIPE it's not expecting */
oldsig_handler = CatchSignal(SIGPIPE, SIGNAL_CAST SIG_IGN);
/* get the username */
retval = pam_get_user( pamh, &name, "Username: " );
if ( retval != PAM_SUCCESS ) {
if (on( SMB_DEBUG, ctrl )) {
_log_err(LOG_DEBUG, "auth: could not identify user");
}
AUTH_RETURN;
}
if (on( SMB_DEBUG, ctrl )) {
_log_err( LOG_DEBUG, "username [%s] obtained", name );
}
if (!initialize_password_db(True, NULL)) {
_log_err( LOG_ALERT, "Cannot access samba password database" );
retval = PAM_AUTHINFO_UNAVAIL;
AUTH_RETURN;
}
sampass = samu_new( NULL );
if (!sampass) {
_log_err( LOG_ALERT, "Cannot talloc a samu struct" );
retval = nt_status_to_pam(NT_STATUS_NO_MEMORY);
AUTH_RETURN;
}
found = pdb_getsampwnam( sampass, name );
if (on( SMB_MIGRATE, ctrl )) {
retval = _smb_add_user(pamh, ctrl, name, sampass, found);
TALLOC_FREE(sampass);
AUTH_RETURN;
}
if (!found) {
_log_err(LOG_ALERT, "Failed to find entry for user %s.", name);
retval = PAM_USER_UNKNOWN;
TALLOC_FREE(sampass);
sampass = NULL;
AUTH_RETURN;
}
/* if this user does not have a password... */
if (_smb_blankpasswd( ctrl, sampass )) {
TALLOC_FREE(sampass);
retval = PAM_SUCCESS;
AUTH_RETURN;
}
/* get this user's authentication token */
retval = _smb_read_password(pamh, ctrl, NULL, "Password: ", NULL, _SMB_AUTHTOK, &p);
if (retval != PAM_SUCCESS ) {
_log_err(LOG_CRIT, "auth: no password provided for [%s]", name);
TALLOC_FREE(sampass);
AUTH_RETURN;
}
/* verify the password of this user */
retval = _smb_verify_password( pamh, sampass, p, ctrl );
TALLOC_FREE(sampass);
p = NULL;
AUTH_RETURN;
}
/*
* This function is for setting samba credentials. If anyone comes up
* with any credentials they think should be set, let me know.
*/
int pam_sm_setcred(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
int retval, *pretval = NULL;
retval = PAM_SUCCESS;
pam_get_data(pamh, "smb_setcred_return", (const void **) &pretval);
if(pretval) {
retval = *pretval;
SAFE_FREE(pretval);
}
pam_set_data(pamh, "smb_setcred_return", NULL, NULL);
return retval;
}
/* Helper function for adding a user to the db. */
static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
const char *name, struct samu *sampass, bool exist)
{
char *err_str = NULL;
char *msg_str = NULL;
const char *pass = NULL;
int retval;
/* Get the authtok; if we don't have one, silently fail. */
retval = pam_get_item( pamh, PAM_AUTHTOK, (const void **) &pass );
if (retval != PAM_SUCCESS) {
_log_err( LOG_ALERT
, "pam_get_item returned error to pam_sm_authenticate" );
return PAM_AUTHTOK_RECOVER_ERR;
} else if (pass == NULL) {
return PAM_AUTHTOK_RECOVER_ERR;
}
/* Add the user to the db if they aren't already there. */
if (!exist) {
retval = NT_STATUS_IS_OK(local_password_change(name, LOCAL_ADD_USER|LOCAL_SET_PASSWORD,
pass, &err_str, &msg_str));
if (!retval && err_str) {
make_remark(pamh, ctrl, PAM_ERROR_MSG, err_str );
} else if (msg_str) {
make_remark(pamh, ctrl, PAM_TEXT_INFO, msg_str );
}
pass = NULL;
SAFE_FREE(err_str);
SAFE_FREE(msg_str);
return PAM_IGNORE;
} else {
/* mimick 'update encrypted' as long as the 'no pw req' flag is not set */
if ( pdb_get_acct_ctrl(sampass) & ~ACB_PWNOTREQ ) {
retval = NT_STATUS_IS_OK(local_password_change(name, LOCAL_SET_PASSWORD,
pass, &err_str, &msg_str));
if (!retval && err_str) {
make_remark(pamh, ctrl, PAM_ERROR_MSG, err_str );
} else if (msg_str) {
make_remark(pamh, ctrl, PAM_TEXT_INFO, msg_str );
}
}
}
SAFE_FREE(err_str);
SAFE_FREE(msg_str);
pass = NULL;
return PAM_IGNORE;
}
/* static module data */
#ifdef PAM_STATIC
struct pam_module _pam_smbpass_auth_modstruct = {
"pam_smbpass",
pam_sm_authenticate,
pam_sm_setcred,
NULL,
NULL,
NULL,
NULL
};
#endif
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