2022-02-04 09:33:31 +00:00
|
|
|
package steward
|
|
|
|
|
2022-02-07 03:23:13 +00:00
|
|
|
import (
|
|
|
|
"crypto/ed25519"
|
|
|
|
"encoding/base64"
|
|
|
|
"fmt"
|
|
|
|
"io/ioutil"
|
|
|
|
"log"
|
|
|
|
"os"
|
|
|
|
"path/filepath"
|
|
|
|
"sync"
|
|
|
|
)
|
2022-02-04 09:33:31 +00:00
|
|
|
|
|
|
|
type signature string
|
|
|
|
|
|
|
|
// allowedSignatures is the structure for reading and writing from
|
|
|
|
// the signatures map. It holds a mutex to use when interacting with
|
|
|
|
// the map.
|
|
|
|
type signatures struct {
|
|
|
|
// allowed is a map for holding all the allowed signatures.
|
|
|
|
allowed map[signature]struct{}
|
|
|
|
mu sync.Mutex
|
2022-02-07 03:23:13 +00:00
|
|
|
|
|
|
|
// Full path to the signing keys folder
|
|
|
|
SignKeyFolder string
|
|
|
|
// Full path to private signing key.
|
|
|
|
SignKeyPrivateKeyPath string
|
|
|
|
// Full path to public signing key.
|
|
|
|
SignKeyPublicKeyPath string
|
|
|
|
|
|
|
|
// private key for ed25519 signing.
|
|
|
|
SignPrivateKey []byte
|
|
|
|
// public key for ed25519 signing.
|
|
|
|
SignPublicKey []byte
|
|
|
|
|
|
|
|
configuration *Configuration
|
|
|
|
|
|
|
|
errorKernel *errorKernel
|
2022-02-04 09:33:31 +00:00
|
|
|
}
|
|
|
|
|
2022-02-07 03:23:13 +00:00
|
|
|
func newSignatures(configuration *Configuration, errorKernel *errorKernel) *signatures {
|
2022-02-04 09:33:31 +00:00
|
|
|
s := signatures{
|
2022-02-07 03:23:13 +00:00
|
|
|
allowed: make(map[signature]struct{}),
|
|
|
|
configuration: configuration,
|
|
|
|
errorKernel: errorKernel,
|
|
|
|
}
|
|
|
|
|
|
|
|
// Set the signing key paths.
|
|
|
|
s.SignKeyFolder = filepath.Join(configuration.ConfigFolder, "signing")
|
|
|
|
s.SignKeyPrivateKeyPath = filepath.Join(s.SignKeyFolder, "private.key")
|
|
|
|
s.SignKeyPublicKeyPath = filepath.Join(s.SignKeyFolder, "public.key")
|
|
|
|
|
|
|
|
err := s.loadSigningKeys()
|
|
|
|
if err != nil {
|
|
|
|
log.Printf("%v\n", err)
|
|
|
|
os.Exit(1)
|
2022-02-04 09:33:31 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return &s
|
|
|
|
}
|
2022-02-07 03:23:13 +00:00
|
|
|
|
|
|
|
// loadSigningKeys will try to load the ed25519 signing keys. If the
|
|
|
|
// files are not found new keys will be generated and written to disk.
|
|
|
|
func (s *signatures) loadSigningKeys() error {
|
|
|
|
// Check if folder structure exist, if not create it.
|
|
|
|
if _, err := os.Stat(s.SignKeyFolder); os.IsNotExist(err) {
|
|
|
|
err := os.MkdirAll(s.SignKeyFolder, 0700)
|
|
|
|
if err != nil {
|
|
|
|
er := fmt.Errorf("error: failed to create directory for signing keys : %v", err)
|
|
|
|
return er
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
// Check if there already are any keys in the etc folder.
|
|
|
|
foundKey := false
|
|
|
|
|
|
|
|
if _, err := os.Stat(s.SignKeyPublicKeyPath); !os.IsNotExist(err) {
|
|
|
|
foundKey = true
|
|
|
|
}
|
|
|
|
if _, err := os.Stat(s.SignKeyPrivateKeyPath); !os.IsNotExist(err) {
|
|
|
|
foundKey = true
|
|
|
|
}
|
|
|
|
|
|
|
|
// If no keys where found generete a new pair, load them into the
|
|
|
|
// processes struct fields, and write them to disk.
|
|
|
|
if !foundKey {
|
|
|
|
pub, priv, err := ed25519.GenerateKey(nil)
|
|
|
|
if err != nil {
|
|
|
|
er := fmt.Errorf("error: failed to generate ed25519 keys for signing: %v", err)
|
|
|
|
return er
|
|
|
|
}
|
|
|
|
pubB64string := base64.RawStdEncoding.EncodeToString(pub)
|
|
|
|
privB64string := base64.RawStdEncoding.EncodeToString(priv)
|
|
|
|
|
|
|
|
// Write public key to file.
|
|
|
|
err = s.writeSigningKey(s.SignKeyPublicKeyPath, pubB64string)
|
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
|
|
|
|
// Write private key to file.
|
|
|
|
err = s.writeSigningKey(s.SignKeyPrivateKeyPath, privB64string)
|
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
|
|
|
|
// Also store the keys in the processes structure so we can
|
|
|
|
// reference them from there when we need them.
|
|
|
|
s.SignPublicKey = pub
|
|
|
|
s.SignPrivateKey = priv
|
|
|
|
|
|
|
|
er := fmt.Errorf("info: no signing keys found, generating new keys")
|
|
|
|
log.Printf("%v\n", er)
|
|
|
|
|
|
|
|
// We got the new generated keys now, so we can return.
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// Key files found, load them into the processes struct fields.
|
|
|
|
pubKey, _, err := s.readKeyFile(s.SignKeyPublicKeyPath)
|
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
s.SignPublicKey = pubKey
|
|
|
|
|
|
|
|
privKey, _, err := s.readKeyFile(s.SignKeyPrivateKeyPath)
|
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
s.SignPublicKey = pubKey
|
|
|
|
s.SignPrivateKey = privKey
|
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// writeSigningKey will write the base64 encoded signing key to file.
|
|
|
|
func (s *signatures) writeSigningKey(realPath string, keyB64 string) error {
|
|
|
|
fh, err := os.OpenFile(realPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
|
|
|
|
if err != nil {
|
|
|
|
er := fmt.Errorf("error: failed to open key file for writing: %v", err)
|
|
|
|
return er
|
|
|
|
}
|
|
|
|
defer fh.Close()
|
|
|
|
|
|
|
|
_, err = fh.Write([]byte(keyB64))
|
|
|
|
if err != nil {
|
|
|
|
er := fmt.Errorf("error: failed to write key to file: %v", err)
|
|
|
|
return er
|
|
|
|
}
|
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// readKeyFile will take the path of a key file as input, read the base64
|
|
|
|
// encoded data, decode the data. It will return the raw data as []byte,
|
|
|
|
// the base64 encoded data, and any eventual error.
|
|
|
|
func (s *signatures) readKeyFile(keyFile string) (ed2519key []byte, b64Key []byte, err error) {
|
|
|
|
fh, err := os.Open(keyFile)
|
|
|
|
if err != nil {
|
|
|
|
er := fmt.Errorf("error: failed to open key file: %v", err)
|
|
|
|
return nil, nil, er
|
|
|
|
}
|
|
|
|
defer fh.Close()
|
|
|
|
|
|
|
|
b, err := ioutil.ReadAll(fh)
|
|
|
|
if err != nil {
|
|
|
|
er := fmt.Errorf("error: failed to read key file: %v", err)
|
|
|
|
return nil, nil, er
|
|
|
|
}
|
|
|
|
|
|
|
|
key, err := base64.RawStdEncoding.DecodeString(string(b))
|
|
|
|
if err != nil {
|
|
|
|
er := fmt.Errorf("error: failed to base64 decode key data: %v", err)
|
|
|
|
return nil, nil, er
|
|
|
|
}
|
|
|
|
|
|
|
|
return key, b, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// verifySignature
|
|
|
|
func (s *signatures) verifySignature(m Message) bool {
|
|
|
|
fmt.Printf(" * DEBUG: verifySignature, method: %v ,s contains: %v\n", m.Method, s)
|
|
|
|
if s.configuration.AllowEmptySignature {
|
|
|
|
fmt.Printf(" * DEBUG: verifySignature: AllowEmptySignature set to TRUE\n")
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
|
|
|
|
// Verify if the signature matches.
|
|
|
|
argsStringified := argsToString(m.MethodArgs)
|
|
|
|
ok := ed25519.Verify(s.SignPublicKey, []byte(argsStringified), m.ArgSignature)
|
|
|
|
|
|
|
|
fmt.Printf(" * DEBUG: verifySignature, result: %v, fromNode: %v, method: %v, signature: %s\n", ok, m.FromNode, m.Method, m.ArgSignature)
|
|
|
|
|
|
|
|
return ok
|
|
|
|
}
|