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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 2 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., 675
* Mass Ave, Cambridge, MA 02139, USA.
*/
/* 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. */
#include <security/pam_appl.h>
#endif /* LINUX */
#include <security/pam_modules.h>
#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, SAM_ACCOUNT *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;
SAM_ACCOUNT *sampass = NULL;
extern BOOL in_client;
const char *name;
void (*oldsig_handler)(int);
BOOL found;
/* Points to memory managed by the PAM library. Do not free. */
char *p = NULL;
/* Samba initialization. */
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 = malloc(sizeof(int));
/* 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 );
}
/* 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);
if (!initialize_password_db(True)) {
_log_err( LOG_ALERT, "Cannot access samba password database" );
retval = PAM_AUTHINFO_UNAVAIL;
AUTH_RETURN;
}
pdb_init_sam(&sampass);
found = pdb_getsampwnam( sampass, name );
if (on( SMB_MIGRATE, ctrl )) {
retval = _smb_add_user(pamh, ctrl, name, sampass, found);
pdb_free_sam(&sampass);
AUTH_RETURN;
}
if (!found) {
_log_err(LOG_ALERT, "Failed to find entry for user %s.", name);
retval = PAM_USER_UNKNOWN;
pdb_free_sam(&sampass);
sampass = NULL;
AUTH_RETURN;
}
/* if this user does not have a password... */
if (_smb_blankpasswd( ctrl, sampass )) {
pdb_free_sam(&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);
pdb_free_sam(&sampass);
AUTH_RETURN;
}
/* verify the password of this user */
retval = _smb_verify_password( pamh, sampass, p, ctrl );
pdb_free_sam(&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, SAM_ACCOUNT *sampass, BOOL exist)
{
pstring err_str;
pstring msg_str;
const char *pass = NULL;
int retval;
err_str[0] = '\0';
msg_str[0] = '\0';
/* 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 = local_password_change( name, LOCAL_ADD_USER|LOCAL_SET_PASSWORD,
pass, err_str,
sizeof(err_str),
msg_str, sizeof(msg_str) );
if (!retval && *err_str)
{
err_str[PSTRING_LEN-1] = '\0';
make_remark( pamh, ctrl, PAM_ERROR_MSG, err_str );
}
else if (*msg_str)
{
msg_str[PSTRING_LEN-1] = '\0';
make_remark( pamh, ctrl, PAM_TEXT_INFO, msg_str );
}
pass = NULL;
return PAM_IGNORE;
}
else {
/* Change the user's password IFF it's null. */
if ((pdb_get_lanman_passwd(sampass) == NULL) && (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ))
{
retval = local_password_change( name, 0, pass, err_str, sizeof(err_str),
msg_str, sizeof(msg_str) );
if (!retval && *err_str)
{
err_str[PSTRING_LEN-1] = '\0';
make_remark( pamh, ctrl, PAM_ERROR_MSG, err_str );
}
else if (*msg_str)
{
msg_str[PSTRING_LEN-1] = '\0';
make_remark( pamh, ctrl, PAM_TEXT_INFO, 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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