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minio/pkg/policy/condition/ipaddressfunc.go

180 lines
4.9 KiB

/*
* Minio Cloud Storage, (C) 2018 Minio, Inc.
*
* 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 condition
import (
"fmt"
"net"
"sort"
)
func toIPAddressFuncString(n name, key Key, values []*net.IPNet) string {
valueStrings := []string{}
for _, value := range values {
valueStrings = append(valueStrings, value.String())
}
sort.Strings(valueStrings)
return fmt.Sprintf("%v:%v:%v", n, key, valueStrings)
}
// ipAddressFunc - IP address function. It checks whether value by Key in given
// values is in IP network. Here Key must be AWSSourceIP.
// For example,
// - if values = [192.168.1.0/24], at evaluate() it returns whether IP address
// in value map for AWSSourceIP falls in the network 192.168.1.10/24.
type ipAddressFunc struct {
k Key
values []*net.IPNet
}
// evaluate() - evaluates to check whether IP address in values map for AWSSourceIP
// falls in one of network or not.
func (f ipAddressFunc) evaluate(values map[string][]string) bool {
IPs := []net.IP{}
for _, s := range values[f.k.Name()] {
IP := net.ParseIP(s)
if IP == nil {
panic(fmt.Errorf("invalid IP address '%v'", s))
}
IPs = append(IPs, IP)
}
for _, IP := range IPs {
for _, IPNet := range f.values {
if IPNet.Contains(IP) {
return true
}
}
}
return false
}
// key() - returns condition key which is used by this condition function.
// Key is always AWSSourceIP.
func (f ipAddressFunc) key() Key {
return f.k
}
// name() - returns "IpAddress" condition name.
func (f ipAddressFunc) name() name {
return ipAddress
}
func (f ipAddressFunc) String() string {
return toIPAddressFuncString(ipAddress, f.k, f.values)
}
// toMap - returns map representation of this function.
func (f ipAddressFunc) toMap() map[Key]ValueSet {
if !f.k.IsValid() {
return nil
}
values := NewValueSet()
for _, value := range f.values {
values.Add(NewStringValue(value.String()))
}
return map[Key]ValueSet{
f.k: values,
}
}
// notIPAddressFunc - Not IP address function. It checks whether value by Key in given
// values is NOT in IP network. Here Key must be AWSSourceIP.
// For example,
// - if values = [192.168.1.0/24], at evaluate() it returns whether IP address
// in value map for AWSSourceIP does not fall in the network 192.168.1.10/24.
type notIPAddressFunc struct {
ipAddressFunc
}
// evaluate() - evaluates to check whether IP address in values map for AWSSourceIP
// does not fall in one of network.
func (f notIPAddressFunc) evaluate(values map[string][]string) bool {
return !f.ipAddressFunc.evaluate(values)
}
// name() - returns "NotIpAddress" condition name.
func (f notIPAddressFunc) name() name {
return notIPAddress
}
func (f notIPAddressFunc) String() string {
return toIPAddressFuncString(notIPAddress, f.ipAddressFunc.k, f.ipAddressFunc.values)
}
func valuesToIPNets(n name, values ValueSet) ([]*net.IPNet, error) {
IPNets := []*net.IPNet{}
for v := range values {
s, err := v.GetString()
if err != nil {
return nil, fmt.Errorf("value %v must be string representation of CIDR for %v condition", v, n)
}
var IPNet *net.IPNet
_, IPNet, err = net.ParseCIDR(s)
if err != nil {
return nil, fmt.Errorf("value %v must be CIDR string for %v condition", s, n)
}
IPNets = append(IPNets, IPNet)
}
return IPNets, nil
}
// newIPAddressFunc - returns new IP address function.
func newIPAddressFunc(key Key, values ValueSet) (Function, error) {
IPNets, err := valuesToIPNets(ipAddress, values)
if err != nil {
return nil, err
}
return NewIPAddressFunc(key, IPNets...)
}
// NewIPAddressFunc - returns new IP address function.
func NewIPAddressFunc(key Key, IPNets ...*net.IPNet) (Function, error) {
if key != AWSSourceIP {
return nil, fmt.Errorf("only %v key is allowed for %v condition", AWSSourceIP, ipAddress)
}
return &ipAddressFunc{key, IPNets}, nil
}
// newNotIPAddressFunc - returns new Not IP address function.
func newNotIPAddressFunc(key Key, values ValueSet) (Function, error) {
IPNets, err := valuesToIPNets(notIPAddress, values)
if err != nil {
return nil, err
}
return NewNotIPAddressFunc(key, IPNets...)
}
// NewNotIPAddressFunc - returns new Not IP address function.
func NewNotIPAddressFunc(key Key, IPNets ...*net.IPNet) (Function, error) {
if key != AWSSourceIP {
return nil, fmt.Errorf("only %v key is allowed for %v condition", AWSSourceIP, notIPAddress)
}
return &notIPAddressFunc{ipAddressFunc{key, IPNets}}, nil
}