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endpoint.go
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endpoint.go
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/*
* Copyright 2018-2021, CS Systemes d'Information, http://csgroup.eu
*
* 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 sshtunnel
import (
"fmt"
"strconv"
"strings"
validation "github.com/go-ozzo/ozzo-validation/v4"
"github.com/go-ozzo/ozzo-validation/v4/is"
"golang.org/x/crypto/ssh"
)
// Syntactic sugar for Endpoint abstraction (Entrypoint, SSHJump, Endpoint)
type Endpoint struct {
user string
host string
port int
authentication []ssh.AuthMethod
}
type Entrypoint = Endpoint
type SSHJump = Endpoint
type EndpointOption func(tunnel *Endpoint) error
func (endpoint Endpoint) Validate() error {
return validation.ValidateStruct(&endpoint,
validation.Field(&endpoint.user, is.Alphanumeric), // "^[a-zA-Z0-9]+$"
validation.Field(&endpoint.host, validation.Required, is.Host), // net.ParseIP and `^([a-zA-Z0-9_]{1}[a-zA-Z0-9_-]{0,62}){1}(\.[a-zA-Z0-9_]{1}[a-zA-Z0-9_-]{0,62})*[\._]?$`
validation.Field(&endpoint.port, validation.Min(0), validation.Max(65535)),
)
}
func EndpointOptionAuth(auth ssh.AuthMethod) EndpointOption {
return func(endp *Endpoint) error {
endp.authentication = append(endp.authentication, auth)
return nil
}
}
func EndpointOptionPassword(pass string) EndpointOption {
return func(endp *Endpoint) error {
endp.authentication = append(endp.authentication, ssh.Password(pass))
return nil
}
}
func EndpointOptionKeyFromString(key string, passphrase string) EndpointOption {
return func(endp *Endpoint) error {
publicKey, err := AuthMethodFromPrivateKey([]byte(key), []byte(passphrase))
if err != nil {
return err
}
endp.authentication = append(endp.authentication, publicKey)
return nil
}
}
func EndpointOptionKeyFromFile(filename, passphrase string) EndpointOption {
return func(endp *Endpoint) error {
pk, err := AuthMethodFromPrivateKeyFile(filename, []byte(passphrase))
if err != nil {
return err
}
endp.authentication = append(endp.authentication, pk)
return nil
}
}
func NewEndpoint(s string, options ...EndpointOption) (_ *Endpoint, err error) {
defer OnPanic(&err)
endpoint := &Endpoint{}
host := s
if parts := strings.Split(s, "@"); len(parts) > 1 {
endpoint.user = parts[0]
endpoint.host = parts[1]
host = endpoint.host
}
if parts := strings.Split(host, ":"); len(parts) > 1 {
endpoint.host = parts[0]
endpoint.port, err = strconv.Atoi(parts[1])
if err != nil {
return &Endpoint{}, fmt.Errorf("invalid: invalid port: %w", err)
}
}
for _, opt := range options {
if opt != nil {
err = opt(endpoint)
if err != nil {
return &Endpoint{}, err
}
}
}
err = endpoint.Validate()
if err != nil {
return &Endpoint{}, err
}
return endpoint, err
}
func (endpoint Endpoint) Address() string {
return fmt.Sprintf("%s:%d", endpoint.host, endpoint.port)
}
func (endpoint Endpoint) User() string {
return endpoint.user
}
func (endpoint Endpoint) Host() string {
return endpoint.host
}
func (endpoint Endpoint) Port() int {
return endpoint.port
}
func (endpoint Endpoint) Authentication() []ssh.AuthMethod {
return endpoint.authentication
}
func (endpoint Endpoint) String() string {
if endpoint.user != "" {
return fmt.Sprintf("%s@%s:%d", endpoint.user, endpoint.host, endpoint.port)
}
return fmt.Sprintf("%s:%d", endpoint.host, endpoint.port)
}
func (endpoint Endpoint) Dump() string {
if endpoint.user != "" {
return fmt.Sprintf("%s@%s:%d", endpoint.user, endpoint.host, endpoint.port)
}
return fmt.Sprintf("%s:%d", endpoint.host, endpoint.port)
}