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utils.go
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/
utils.go
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// Copyright © 2019 Ispirata Srl
//
// 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 utils
import (
"github.com/astarte-platform/astartectl/utils"
"github.com/spf13/cobra"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"os"
"strings"
)
// UtilsCmd represents the utils command
var UtilsCmd = &cobra.Command{
Use: "utils",
Short: "Various utilities to interact with Astarte",
Long: `utils includes commands to generate keypairs and device ids`,
}
var genKeypairCmd = &cobra.Command{
Use: "gen-keypair <realm_name>",
Short: "Generate an RSA keypair",
Long: `Generate an RSA keypair to use for realm authentication.
The keypair will be saved in the current directory with names <realm_name>_private.pem and <realm_name>_public.pem`,
Example: ` astartectl utils gen-keypair myrealm`,
Args: cobra.ExactArgs(1),
RunE: genKeypairF,
}
var jwtTypesToClaim = map[string]string{
"housekeeping": "a_ha",
"realm-management": "a_rma",
"pairing": "a_pa",
"appengine": "a_aea",
"channels": "a_ch",
}
var jwtTypes = []string{"housekeeping", "realm-management", "pairing", "appengine", "channels"}
var genJwtCmd = &cobra.Command{
Use: "gen-jwt <type>",
Short: "Generate a JWT",
Long: `Generate a JWT to access one of astarte APIs.`,
Example: ` astartectl utils gen-jwt realm-management -k test-realm.key`,
Args: cobra.ExactArgs(1),
ValidArgs: jwtTypes,
RunE: genJwtF,
}
func init() {
genJwtCmd.Flags().StringP("private-key", "k", "", `Path to PEM encoded private key.
Should be Housekeeping key to generate an housekeeping token, Realm key for everything else.`)
genJwtCmd.MarkFlagRequired("private-key")
genJwtCmd.MarkFlagFilename("private-key")
genJwtCmd.Flags().StringSliceP("claims", "c", nil, `The list of claims to be added in the JWT. Defaults to all-access claims.
You can specify the flag multiple times or separate the claims with a comma.`)
genJwtCmd.Flags().Int64P("expiry", "e", 300, "Expiration time of the token in seconds. 0 means the token will never expire.")
UtilsCmd.AddCommand(genKeypairCmd)
UtilsCmd.AddCommand(genJwtCmd)
}
func genKeypairF(command *cobra.Command, args []string) error {
realm := args[0]
reader := rand.Reader
bitSize := 4096
key, err := rsa.GenerateKey(reader, bitSize)
if err != nil {
return err
}
checkError(err)
publicKey := key.PublicKey
fmt.Println("Keypair generated successfully")
savePEMKey(realm+"_private.pem", key)
savePublicPEMKey(realm+"_public.pem", publicKey)
return nil
}
func validJwtType(t string) bool {
for _, validType := range jwtTypes {
if t == validType {
return true
}
}
return false
}
func genJwtF(command *cobra.Command, args []string) error {
jwtType := args[0]
astarteService, err := utils.AstarteServiceFromString(jwtType)
if err != nil {
errorString := fmt.Sprintf("Invalid type. Valid types are: %s", strings.Join(jwtTypes, ", "))
return errors.New(errorString)
}
privateKey, err := command.Flags().GetString("private-key")
if err != nil {
return err
}
expiryOffset, err := command.Flags().GetInt64("expiry")
if err != nil {
return err
}
accessClaims, err := command.Flags().GetStringSlice("claims")
if err != nil {
return err
}
tokenString, err := utils.GenerateAstarteJWTFromKeyFile(privateKey, astarteService, accessClaims, expiryOffset)
if err != nil {
return err
}
fmt.Println(tokenString)
return nil
}
func savePEMKey(fileName string, key *rsa.PrivateKey) {
outFile, err := os.Create(fileName)
checkError(err)
defer outFile.Close()
var privateKey = &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}
err = pem.Encode(outFile, privateKey)
checkError(err)
fmt.Println("Wrote " + fileName)
}
func savePublicPEMKey(fileName string, pubkey rsa.PublicKey) {
pkixBytes, err := x509.MarshalPKIXPublicKey(&pubkey)
checkError(err)
var pemkey = &pem.Block{
Type: "PUBLIC KEY",
Bytes: pkixBytes,
}
pemfile, err := os.Create(fileName)
checkError(err)
defer pemfile.Close()
err = pem.Encode(pemfile, pemkey)
checkError(err)
fmt.Println("Wrote " + fileName)
}
func checkError(err error) {
if err != nil {
fmt.Println("Fatal error ", err.Error())
os.Exit(1)
}
}