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bolt.go
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bolt.go
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// Copyright 2017 Google Inc.
//
// 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 store
import (
"crypto/x509/pkix"
"errors"
"math/big"
"time"
"fmt"
"github.com/boltdb/bolt"
"github.com/google/easypki/pkg/certificate"
)
var (
keysBucketKey = []byte("keys")
certsBucketKey = []byte("certs")
revokedBucketKey = []byte("revoked")
)
// Errors.
var (
ErrDoesNotExist = errors.New("does not exist")
)
// Bolt lets us store a Certificate Authority in a Bolt DB.
//
// Certificate bundles are stored per CA bucket, and each of them has a keys
// bucket and a certs buckets.
type Bolt struct {
DB *bolt.DB
}
// Add adds the given bundle to the database.
func (b *Bolt) Add(caName, name string, isCa bool, key, cert []byte) error {
return b.DB.Update(func(tx *bolt.Tx) error {
kb, cb, err := buckets(tx, caName)
if err != nil {
return err
}
k := []byte(name)
if err := kb.Put(k, key); err != nil {
return fmt.Errorf("failed puting %v key into %v keys bucket: %v", name, caName, err)
}
if err := cb.Put(k, cert); err != nil {
return fmt.Errorf("failed puting %v cert into %v certs bucket: %v", name, caName, err)
}
if isCa && name != caName {
kb, cb, err = buckets(tx, name)
if err != nil {
return err
}
if err := kb.Put(k, key); err != nil {
return fmt.Errorf("failed puting %v key into %v keys bucket: %v", name, name, err)
}
if err := cb.Put(k, cert); err != nil {
return fmt.Errorf("failed puting %v cert into %v certs bucket: %v", name, name, err)
}
}
return nil
})
}
// Fetch fetchs the private key and certificate for a given name signed by caName.
func (b *Bolt) Fetch(caName, name string) ([]byte, []byte, error) {
var key, cert []byte
err := b.DB.View(func(tx *bolt.Tx) error {
rb := tx.Bucket([]byte(caName))
if rb == nil {
return fmt.Errorf("%v bucket does not exist", caName)
}
kb := rb.Bucket(keysBucketKey)
if kb == nil {
return fmt.Errorf("%v keys bucket does not exist", caName)
}
cb := rb.Bucket(certsBucketKey)
if cb == nil {
return fmt.Errorf("%v certs bucket does not exist", caName)
}
k := []byte(name)
key = kb.Get(k)
cert = cb.Get(k)
if key == nil || cert == nil {
return ErrDoesNotExist
}
return nil
})
return key, cert, err
}
// Update updates the state of a given certificate in the index.txt.
func (b *Bolt) Update(caName string, sn *big.Int, st certificate.State) error {
if st != certificate.Revoked {
return fmt.Errorf("unsupported update for certificate state %v", st)
}
return b.DB.Update(func(tx *bolt.Tx) error {
root, err := tx.CreateBucketIfNotExists([]byte(caName))
if err != nil {
return fmt.Errorf("failed getting %v bucket: %v", caName, err)
}
revoked, err := root.CreateBucketIfNotExists(revokedBucketKey)
if err != nil {
return fmt.Errorf("failed getting %v revoked bucket: %v", root, err)
}
t, err := time.Now().GobEncode()
if err != nil {
return fmt.Errorf("failed gob encoding current time: %v", err)
}
k, err := sn.GobEncode()
if err != nil {
return fmt.Errorf("failed gob encoding serial number %v: %v", sn, err)
}
if err := revoked.Put(k, t); err != nil {
return fmt.Errorf("failed adding serial number %v to the %v revoked bucket: %v", sn, caName, err)
}
return nil
})
}
// Revoked returns a list of revoked certificates.
func (b *Bolt) Revoked(caName string) ([]pkix.RevokedCertificate, error) {
var revokedCerts []pkix.RevokedCertificate
if err := b.DB.View(func(tx *bolt.Tx) error {
root := tx.Bucket([]byte(caName))
if root == nil {
return fmt.Errorf("%v bucket does not exist", caName)
}
revoked := root.Bucket(revokedBucketKey)
if revoked == nil {
return nil
}
return revoked.ForEach(func(k, v []byte) error {
sn := big.NewInt(0)
if err := sn.GobDecode(k); err != nil {
return fmt.Errorf("failed gob decoding serial number: %v", err)
}
t := time.Time{}
if err := t.GobDecode(v); err != nil {
return fmt.Errorf("failed gob decoding revocation time: %v", err)
}
revokedCerts = append(revokedCerts, pkix.RevokedCertificate{
SerialNumber: sn,
RevocationTime: t,
})
return nil
})
}); err != nil {
return nil, err
}
return revokedCerts, nil
}
// buckets returns respectively the keys and certs buckets nested below the
// given root bucket.
func buckets(tx *bolt.Tx, root string) (*bolt.Bucket, *bolt.Bucket, error) {
rb, err := tx.CreateBucketIfNotExists([]byte(root))
if err != nil {
return nil, nil, fmt.Errorf("failed getting %v bucket: %v", root, err)
}
kb, err := rb.CreateBucketIfNotExists(keysBucketKey)
if err != nil {
return nil, nil, fmt.Errorf("failed getting %v keys bucket: %v", root, err)
}
cb, err := rb.CreateBucketIfNotExists(certsBucketKey)
if err != nil {
return nil, nil, fmt.Errorf("failed getting %v certs bucket: %v", root, err)
}
return kb, cb, nil
}