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keyStore.go
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keyStore.go
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package main
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"github.com/Comcast/webpa-common/secure/key"
"log"
)
// KeyStore provides a single access point for a set of keys, keyed by their key identifiers
// or kid values in JWTs.
type KeyStore struct {
keyIDs []string
privateKeys map[string]*rsa.PrivateKey
publicKeys map[string][]byte
}
func (ks *KeyStore) Len() int {
return len(ks.keyIDs)
}
func (ks *KeyStore) KeyIDs() []string {
return ks.keyIDs
}
func (ks *KeyStore) PrivateKey(keyID string) (privateKey *rsa.PrivateKey, ok bool) {
privateKey, ok = ks.privateKeys[keyID]
return
}
func (ks *KeyStore) PublicKey(keyID string) (data []byte, ok bool) {
data, ok = ks.publicKeys[keyID]
return
}
// NewKeyStore exchanges a Configuration for a KeyStore.
func NewKeyStore(infoLogger *log.Logger, c *Configuration) (*KeyStore, error) {
if err := c.Validate(); err != nil {
return nil, err
}
privateKeys := make(map[string]*rsa.PrivateKey, len(c.Keys)+len(c.Generate))
if err := resolveKeys(infoLogger, c, privateKeys); err != nil {
return nil, err
}
if err := generateKeys(infoLogger, c, privateKeys); err != nil {
return nil, err
}
publicKeys := make(map[string][]byte, len(privateKeys))
if err := marshalPublicKeys(publicKeys, privateKeys); err != nil {
return nil, err
}
keyIDs := make([]string, 0, len(privateKeys))
for keyID, _ := range privateKeys {
keyIDs = append(keyIDs, keyID)
}
return &KeyStore{
keyIDs: keyIDs,
privateKeys: privateKeys,
publicKeys: publicKeys,
}, nil
}
func resolveKeys(infoLogger *log.Logger, c *Configuration, privateKeys map[string]*rsa.PrivateKey) error {
for keyID, resourceFactory := range c.Keys {
infoLogger.Printf("Key [%s]: loading from resource %#v\n", keyID, resourceFactory)
keyResolver, err := (&key.ResolverFactory{
Factory: *resourceFactory,
Purpose: key.PurposeSign,
}).NewResolver()
if err != nil {
return err
}
resolvedPair, err := keyResolver.ResolveKey(keyID)
if err != nil {
return err
}
if resolvedPair.HasPrivate() {
privateKeys[keyID] = resolvedPair.Private().(*rsa.PrivateKey)
} else {
return fmt.Errorf("The key %s did not resolve to an RSA private key")
}
}
return nil
}
func generateKeys(infoLogger *log.Logger, c *Configuration, privateKeys map[string]*rsa.PrivateKey) error {
bits := c.Bits
if bits < 1 {
bits = DefaultBits
}
for _, keyID := range c.Generate {
infoLogger.Printf("Key [%s]: generating ...", keyID)
if generatedKey, err := rsa.GenerateKey(rand.Reader, bits); err == nil {
privateKeys[keyID] = generatedKey
} else {
return err
}
}
return nil
}
func marshalPublicKeys(publicKeys map[string][]byte, privateKeys map[string]*rsa.PrivateKey) error {
for keyID, privateKey := range privateKeys {
derBytes, err := x509.MarshalPKIXPublicKey(privateKey.Public())
if err != nil {
return err
}
block := pem.Block{
Type: "PUBLIC KEY",
Bytes: derBytes,
}
var buffer bytes.Buffer
err = pem.Encode(&buffer, &block)
if err != nil {
return err
}
publicKeys[keyID] = buffer.Bytes()
}
return nil
}