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ctrl/signatures.go

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package steward
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import (
"crypto/ed25519"
"encoding/base64"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"sync"
)
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
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// 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
}
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func newSignatures(configuration *Configuration, errorKernel *errorKernel) *signatures {
s := signatures{
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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)
}
return &s
}
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// 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
}