source: vendor/3.5.8/source3/auth/auth_script.c

/* 
   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"

#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 auth_usersupplied_info *user_info, 
                                        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->domain) + 1 +
                        strlen(user_info->smb_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;
        }

        safe_strcpy( secret_str, user_info->domain, secret_str_len - 1);
        safe_strcat( secret_str, "\n", secret_str_len - 1);
        safe_strcat( secret_str, user_info->smb_name, secret_str_len - 1);
        safe_strcat( secret_str, "\n", secret_str_len - 1);

        for (i = 0; i < 8; i++) {
                slprintf(&hex_str[i*2], 3, "%02X", auth_context->challenge.data[i]);
        }
        safe_strcat( secret_str, hex_str, secret_str_len - 1);
        safe_strcat( secret_str, "\n", secret_str_len - 1);

        if (user_info->lm_resp.data) {
                for (i = 0; i < 24; i++) {
                        slprintf(&hex_str[i*2], 3, "%02X", user_info->lm_resp.data[i]);
                }
                safe_strcat( secret_str, hex_str, secret_str_len - 1);
        }
        safe_strcat( secret_str, "\n", secret_str_len - 1);

        if (user_info->nt_resp.data) {
                for (i = 0; i < 24; i++) {
                        slprintf(&hex_str[i*2], 3, "%02X", user_info->nt_resp.data[i]);
                }
                safe_strcat( secret_str, hex_str, secret_str_len - 1);
        }
        safe_strcat( secret_str, "\n", secret_str_len - 1);

        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->domain, user_info->smb_name ));
                /* auth failed. */
                return NT_STATUS_NO_SUCH_USER;
        }

        /* Cause the auth system to keep going.... */
        return NT_STATUS_NOT_IMPLEMENTED;
}

/* module initialisation */
static NTSTATUS auth_init_script(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
{
        if (!make_auth_methods(auth_context, auth_method)) {
                return NT_STATUS_NO_MEMORY;
        }

        (*auth_method)->name = "script";
        (*auth_method)->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;
                }
                (*auth_method)->private_data = (void *)priv;
        }
        return NT_STATUS_OK;
}

NTSTATUS auth_script_init(void);
NTSTATUS auth_script_init(void)
{
        return smb_register_auth(AUTH_INTERFACE_VERSION, "script", auth_init_script);
}