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firewall.go
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firewall.go
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/*
* Copyright 2018-2019, CS Systemes d'Information, http://www.c-s.fr
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package firewall
import (
"fmt"
"github.com/CS-SI/SafeScale/lib/utils/scerr"
"strings"
"github.com/CS-SI/SafeScale/lib/system"
)
// Firewall implements a Firewall based on iptables
type Firewall struct {
// Tables contains all the tables of the Firewall
Tables map[string]*Table
}
// NewFirewall creates a new instance of Firewall and returns a pointer to it
func NewFirewall(ssh *system.SSHConfig) *Firewall {
fw := Firewall{
Tables: map[string]*Table{
"filter": &Table{
Name: "filter",
Chains: map[string]*Chain{
"INPUT": &Chain{
Name: "INPUT",
},
"OUTPUT": &Chain{
Name: "OUTPUT",
},
"FORWARD": &Chain{
Name: "FORWARD",
},
},
},
"mangle": &Table{
Name: "mangle",
Chains: nil,
},
"raw": &Table{
Name: "raw",
Chains: nil,
},
},
}
return &fw
}
// FromSystem loads the current Firewall configuration from system
func (fw *Firewall) FromSystem() error {
return scerr.NotImplementedError("FromSystem() not implemented yet")
}
// Table returns the Table instance corresponding to table 'name'
func (fw *Firewall) Table(name string) (*Table, error) {
name = strings.ToLower(name)
var table *Table
var ok bool
if table, ok = fw.Tables[name]; !ok {
return nil, fmt.Errorf("table '%s' not found in firewall", name)
}
return table, nil
}
// ToSystem applies the firewall rules to the host
func (fw *Firewall) ToSystem() error {
return scerr.NotImplementedError("ToSystem() not implemented yet")
}