path: root/database/sqlite/administration.c

/* administration.c  --  Functions needed for administration tasks
 *
 *  GPLv2 only - Copyright (C) 2008, 2009
 *               David Sommerseth <dazo@users.sourceforge.net>
 *
 *  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; version 2
 *  of the License.
 *
 *  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

/**
 * @file   administration.c
 * @author David Sommerseth <dazo@users.sourceforge.net>
 * @date   2008-12-03
 *
 * @brief  Functions needed for the administration interface.  This file
 *         primarily takes care of user authentication via the administration API
 *
 */

#include <string.h>
#include <unistd.h>
#include <assert.h>

#include <libxml/tree.h>

/**
 * @{
 */
#ifndef DRIVERAPIVERSION
# define DRIVERAPIVERSION 2
#endif
/**
 * @}
 */

#include <sqlite3.h>

#include <eurephia_nullsafe.h>
#include <eurephia_context.h>
#include <eurephia_log.h>
#include <eurephia_xml.h>
#include <eurephia_values.h>
#include <eurephiadb_session_struct.h>
#include <eurephiadb_mapping.h>
#include <passwd.h>

#ifndef DRIVER_MODE
#define DRIVER_MODE
#endif
#include <eurephiadb_driver.h>

#include "sqlite.h"

#if (DRIVERAPIVERSION > 1) || defined(DOXYGEN)
/*
 *  API Version 2 functions
 *
 */

/**
 * @copydoc eDBadminAuth()
 */
int eDBadminAuth(eurephiaCTX *ctx, const char *req_access, const char *uname, const char *pwd) {
        dbresult *res = NULL;
        char *crpwd = NULL, *dbpwd = NULL;
        char *activated = NULL, *deactivated = NULL, *blid = NULL;
        int uid = -1, access = 0;
        char interface;

        DEBUG(ctx, 20, "Function call: eDBadminAuth(ctx, '%s, '%s', 'xxxxxxxx')", req_access, uname);

        assert(ctx != NULL);

        switch( ctx->context_type ) {
        case ECTX_ADMIN_CONSOLE:
                interface = 'C';
                break;
        case ECTX_ADMIN_WEB:
                interface = 'W';
                break;
        default:
                eurephia_log(ctx, LOG_ERROR, 0, "Wrong eurephia context type (0x%04x)", ctx->context_type);
                return 0;
        }

        if( (strlen_nullsafe(uname) < 4) || (strlen_nullsafe(pwd) < 4) ) {
                eurephia_log(ctx, LOG_WARNING, 0, "User name and/or password is either null or less than 4 bytes");
                return 0;
        }

        //
        // Authenticate user and password
        //
        res = sqlite_query(ctx,
                           "SELECT activated, deactivated, bl.blid, "
                           "       password, uid "
                           "  FROM openvpn_users ou"
                           "  LEFT JOIN openvpn_blacklist bl USING (username)"
                           " WHERE ou.username = '%q'",
                           uname);

        if( res == NULL ) {
                eurephia_log(ctx, LOG_FATAL, 0, "Could not authenticate user against the database");
                return 0;
        }

        if( sqlite_get_numtuples(res) == 1 ) {
                activated   = sqlite_get_value(res, 0, 0);
                deactivated = sqlite_get_value(res, 0, 1);
                blid        = sqlite_get_value(res, 0, 2);
                dbpwd       = sqlite_get_value(res, 0, 3);
                uid         = atoi_nullsafe(sqlite_get_value(res, 0, 4));

                if( blid != NULL ) {
                        eurephia_log(ctx, LOG_WARNING, 0,
                                     "Your user account is BLACKLISTED.  You have no access.");
                        sqlite_free_results(res);
                        return 0;
                }

                if( activated == NULL ) {
                        eurephia_log(ctx, LOG_WARNING, 0, "Your user account is not yet activated.");
                        sqlite_free_results(res);
                        return 0;
                }

                if( deactivated != NULL ) {
                        eurephia_log(ctx, LOG_WARNING, 0, "Your user account is deactivated.");
                        sqlite_free_results(res);
                        return 0;
                }

                if( dbpwd == NULL ) {
                        eurephia_log(ctx, LOG_WARNING, 0, "Authentication failed. DB error.");
                        sqlite_free_results(res);
                        return 0;
                } else {
                        int pwdok = 0;
                        // Verify the password
                        crpwd = eurephia_pwd_crypt(ctx, pwd, dbpwd);
                        pwdok = ((crpwd != NULL) && (strcmp(crpwd, dbpwd) == 0) ? 1 : 0);
                        memset(crpwd, 0, strlen_nullsafe(crpwd));
                        memset(dbpwd, 0, strlen_nullsafe(dbpwd));
                        free_nullsafe(ctx, crpwd);
                        if( pwdok == 0 ) {
                                eurephia_log(ctx, LOG_WARNING, 0, "Authentication failed.");
                                sleep(2);
                                sqlite_free_results(res);
                                return 0;
                        }
                }
                sqlite_free_results(res);

                // Check if access level is granted
                // (SQLite do not handle advanced joins so well, so we need to
                //  do this check with an extra query)
                res = sqlite_query(ctx,
                                   "SELECT (count(*) = 1) AS access "
                                   "  FROM eurephia_adminaccess"
                                   " WHERE uid = '%i' AND interface = '%c' AND access = '%q'",
                                   uid, interface, req_access);
                if( res == NULL ) {
                        eurephia_log(ctx, LOG_FATAL, 0, "Could not check access level");
                        return 0;
                }
                access = atoi_nullsafe(sqlite_get_value(res, 0, 0));
                sqlite_free_results(res);

                if( access == 0 ) {
                        eurephia_log(ctx, LOG_WARNING, 0, "Your account is lacking privileges for this operation");
                        return 0;
                }
        } else {
                eurephia_log(ctx, LOG_WARNING, 0, "Authentication failed. No unique records found.");
                sqlite_free_results(res);
                sleep(2);
                return 0;
        }

        // If we reach this place, authentication was successful.  Return users uid
        return uid;
}


/**
 * @copydoc eDBadminValidateSession()
 */
int eDBadminValidateSession(eurephiaCTX *ctx, const char *sesskey, const char *req_access) {
        dbresult *res = NULL;
        int valid = 0, access = 0, expire_time = 0;
        char interface;

        DEBUG(ctx, 20, "Function call: eDBadminValidateSession(ctx, '%s, '%s')", sesskey, req_access);
        assert( (ctx != NULL) && (sesskey != NULL) );

        switch( ctx->context_type ) {
        case ECTX_ADMIN_CONSOLE:
                interface = 'C';
                break;
        case ECTX_ADMIN_WEB:
                interface = 'W';
                break;
        default:
                eurephia_log(ctx, LOG_ERROR, 0, "Wrong eurephia context type (0x%04x)", ctx->context_type);
                return 0;
        }

        // Check if the session is still valid (not expired) and that this session are allowed to access
        // the requested access level.
        expire_time = (60 * atoi_nullsafe(defaultValue(eGet_value(ctx->dbc->config, "eurephiadmin_autologout"),
                                                       "10")
                                          )
                       );
        res = sqlite_query(ctx,
                           "SELECT (strftime('%%s',CURRENT_TIMESTAMP)-strftime('%%s',last_action)) > %i AS exp,"
                           "       (access IS NOT NULL) AS access"
                           "  FROM eurephia_adminlog"
                           "  LEFT JOIN eurephia_adminaccess USING(uid,interface)"
                           " WHERE status IN (1,2)"
                           "       AND sessionkey = '%q'"
                           "       AND access = '%q'"
                           "       AND interface = '%c'",
                           expire_time, sesskey, req_access, interface);

        if( (res == NULL) ) {
                eurephia_log(ctx, LOG_FATAL, 0, "Could not validate session");
                return 0;
        }

        valid  = (atoi_nullsafe(sqlite_get_value(res, 0, 0)) == 0);
        access = (atoi_nullsafe(sqlite_get_value(res, 0, 1)) == 1);
        sqlite_free_results(res);

        // If still valid, update last_action
        if( valid && access ) {
                res = sqlite_query(ctx,
                                   "UPDATE eurephia_adminlog"
                                   "   SET last_action = CURRENT_TIMESTAMP, status = 2"
                                   " WHERE sessionkey = '%q'", sesskey);
                if( res == NULL ) {
                        eurephia_log(ctx, LOG_ERROR, 0, "Could not register session activity");
                }
                sqlite_free_results(res);

        } else {
                // If not valid, register session as auto-logged out

                res = sqlite_query(ctx,
                                   "UPDATE eurephia_adminlog"
                                   "   SET logout = CURRENT_TIMESTAMP, status = %i"
                                   " WHERE sessionkey = '%q'",
                                   (access ? 4 : 5), sesskey);
                if( res == NULL ) {
                        eurephia_log(ctx, LOG_ERROR, 0, "Could not register old session as logged out");
                }
                sqlite_free_results(res);

                // Delete session variables
                res = sqlite_query(ctx, "DELETE FROM openvpn_sessions WHERE sessionkey = '%q'",
                                   sesskey);
                if( res == NULL ) {
                        eurephia_log(ctx, LOG_ERROR, 0,
                                     "Could not delete session variables (%s))", sesskey);
                        return 0;
                }
                sqlite_free_results(res);

                if( !access ) {
                        eurephia_log(ctx, LOG_WARNING, 0, "Your user account is lacking privileges");
                }

        }
        return (valid && access);
}


/**
 * @copydoc eDBadminRegisterLogin()
 */
int eDBadminRegisterLogin(eurephiaCTX *ctx, eurephiaSESSION *session) {
        dbresult *res = NULL;
        char interface;
        int uid;

        DEBUG(ctx, 20, "Function call: eDBadminRegisterLogin(ctx, {session}'%s')", session->sessionkey);
        assert((ctx != NULL) && (session != NULL));

        switch( ctx->context_type ) {
        case ECTX_ADMIN_CONSOLE:
                interface = 'C'; break;
        case ECTX_ADMIN_WEB:
                interface = 'W'; break;
        default:
                eurephia_log(ctx, LOG_ERROR, 0, "Wrong eurephia context type (0x%04x)", ctx->context_type);
                return 0;
        }

        // Register login into eurephia_adminlog ... uid, login, interface, sessionkey
        uid = atoi_nullsafe(eGet_value(session->sessvals, "uid"));
        res = sqlite_query(ctx,
                           "INSERT INTO eurephia_adminlog "
                           "       (uid, interface, status, login, last_action, sessionkey) "
                           "VALUES ('%i','%c',1,CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, '%q')",
                           uid, interface, session->sessionkey);
        if( !res ) {
                eurephia_log(ctx, LOG_FATAL, 0, "Could not manage to register the session in the database");
                return 0;
        }
        sqlite_free_results(res);
        return 1;
}


/**
 * @copydoc eDBadminLogout()
 */
int eDBadminLogout(eurephiaCTX *ctx, const char *sessionkey) {
        dbresult *res = NULL;

        DEBUG(ctx, 20, "Function call: eDBadminLogout(ctx, '%s')", sessionkey);
        assert((ctx != NULL) && (sessionkey != NULL));

        if( (ctx->context_type != ECTX_ADMIN_CONSOLE) && (ctx->context_type != ECTX_ADMIN_WEB) ) {
                eurephia_log(ctx, LOG_CRITICAL, 0,
                             "eurephia admin function call attempted with wrong context type");
                return 0;
        }

        // Update session as logged out
        res = sqlite_query(ctx,
                           "UPDATE eurephia_adminlog "
                           "   SET logout = CURRENT_TIMESTAMP, status = 3"
                           " WHERE sessionkey = '%q'",
                           sessionkey);
        if( !res ) {
                eurephia_log(ctx, LOG_FATAL, 0, "Could not manage to register the session as logged out");
                return 0;
        }
        sqlite_free_results(res);

        // Delete session variables
        res = sqlite_query(ctx, "DELETE FROM openvpn_sessions WHERE sessionkey = '%q'", sessionkey);
        if( res == NULL ) {
                eurephia_log(ctx, LOG_ERROR, 0,
                             "Could not delete session variables (%s))", sessionkey);
                return 0;
        }
        sqlite_free_results(res);

        return 1;
}
#endif