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/*
Unix SMB/CIFS implementation.
Call out to a shell script for an authentication check.
Copyright (C) Jeremy Allison 2005.
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/>.
*/
#include "includes.h"
#include "auth.h"
#undef malloc
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/* Create a string containing the supplied :
* domain\n
* user\n
* ascii hex challenge\n
* ascii hex LM response\n
* ascii hex NT response\n\0
* and execute a shell script to check this.
* Allows external programs to create users on demand.
* Script returns zero on success, non-zero on fail.
*/
static NTSTATUS script_check_user_credentials(const struct auth_context *auth_context,
void *my_private_data,
TALLOC_CTX *mem_ctx,
const struct auth_usersupplied_info *user_info,
struct auth_serversupplied_info **server_info)
{
const char *script = lp_parm_const_string( GLOBAL_SECTION_SNUM, "auth_script", "script", NULL);
char *secret_str;
size_t secret_str_len;
char hex_str[49];
int ret, i;
if (!script) {
return NT_STATUS_INVALID_PARAMETER;
}
if (!user_info) {
return NT_STATUS_INVALID_PARAMETER;
}
if (!auth_context) {
DEBUG(3,("script_check_user_credentials: no auth_info !\n"));
return NT_STATUS_INVALID_PARAMETER;
}
secret_str_len = strlen(user_info->mapped.domain_name) + 1 +
strlen(user_info->client.account_name) + 1 +
16 + 1 + /* 8 bytes of challenge going to 16 */
48 + 1 + /* 24 bytes of challenge going to 48 */
48 + 1;
secret_str = (char *)malloc(secret_str_len);
if (!secret_str) {
return NT_STATUS_NO_MEMORY;
}
if (strlcpy( secret_str, user_info->mapped.domain_name, secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
if (strlcat( secret_str, "\n", secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
if (strlcat( secret_str, user_info->client.account_name, secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
if (strlcat( secret_str, "\n", secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
for (i = 0; i < 8; i++) {
slprintf(&hex_str[i*2], 3, "%02X", auth_context->challenge.data[i]);
}
if (strlcat( secret_str, hex_str, secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
if (strlcat( secret_str, "\n", secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
if (user_info->password.response.lanman.data) {
for (i = 0; i < 24; i++) {
slprintf(&hex_str[i*2], 3, "%02X", user_info->password.response.lanman.data[i]);
}
if (strlcat( secret_str, hex_str, secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
}
if (strlcat( secret_str, "\n", secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
if (user_info->password.response.nt.data) {
for (i = 0; i < 24; i++) {
slprintf(&hex_str[i*2], 3, "%02X", user_info->password.response.nt.data[i]);
}
if (strlcat( secret_str, hex_str, secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
}
if (strlcat( secret_str, "\n", secret_str_len) >= secret_str_len) {
/* Truncate. */
goto cat_out;
}
DEBUG(10,("script_check_user_credentials: running %s with parameters:\n%s\n",
script, secret_str ));
ret = smbrunsecret( script, secret_str);
SAFE_FREE(secret_str);
if (ret) {
DEBUG(1,("script_check_user_credentials: failed to authenticate %s\\%s\n",
user_info->mapped.domain_name, user_info->client.account_name ));
/* auth failed. */
return NT_STATUS_NO_SUCH_USER;
}
/* Cause the auth system to keep going.... */
return NT_STATUS_NOT_IMPLEMENTED;
cat_out:
SAFE_FREE(secret_str);
return NT_STATUS_NO_MEMORY;
}
/* module initialisation */
static NTSTATUS auth_init_script(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
{
struct auth_methods *result;
result = talloc_zero(auth_context, struct auth_methods);
if (result == NULL) {
return NT_STATUS_NO_MEMORY;
}
result->name = "script";
result->auth = script_check_user_credentials;
if (param && *param) {
/* we load the 'fallback' module - if script isn't here, call this
module */
auth_methods *priv;
if (!load_auth_module(auth_context, param, &priv)) {
return NT_STATUS_UNSUCCESSFUL;
}
result->private_data = (void *)priv;
}
*auth_method = result;
return NT_STATUS_OK;
}
NTSTATUS auth_script_init(TALLOC_CTX *);
NTSTATUS auth_script_init(TALLOC_CTX *ctx)
{
return smb_register_auth(AUTH_INTERFACE_VERSION, "script", auth_init_script);
}
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