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crypt.go
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crypt.go
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// Copyright (C) MongoDB, Inc. 2017-present.
//
// 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
package driver
import (
"context"
"crypto/tls"
"fmt"
"io"
"strings"
"time"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
"go.mongodb.org/mongo-driver/x/mongo/driver/mongocrypt"
"go.mongodb.org/mongo-driver/x/mongo/driver/mongocrypt/options"
)
const (
defaultKmsPort = 443
defaultKmsTimeout = 10 * time.Second
)
// CollectionInfoFn is a callback used to retrieve collection information.
type CollectionInfoFn func(ctx context.Context, db string, filter bsoncore.Document) (bsoncore.Document, error)
// KeyRetrieverFn is a callback used to retrieve keys from the key vault.
type KeyRetrieverFn func(ctx context.Context, filter bsoncore.Document) ([]bsoncore.Document, error)
// MarkCommandFn is a callback used to add encryption markings to a command.
type MarkCommandFn func(ctx context.Context, db string, cmd bsoncore.Document) (bsoncore.Document, error)
// CryptOptions specifies options to configure a Crypt instance.
type CryptOptions struct {
CollInfoFn CollectionInfoFn
KeyFn KeyRetrieverFn
MarkFn MarkCommandFn
KmsProviders map[string]map[string]interface{}
SchemaMap map[string]bsoncore.Document
BypassAutoEncryption bool
}
// Crypt consumes the libmongocrypt.MongoCrypt type to iterate the mongocrypt state machine and perform encryption
// and decryption.
type Crypt struct {
mongoCrypt *mongocrypt.MongoCrypt
collInfoFn CollectionInfoFn
keyFn KeyRetrieverFn
markFn MarkCommandFn
BypassAutoEncryption bool
}
// NewCrypt creates a new Crypt instance configured with the given AutoEncryptionOptions.
func NewCrypt(opts *CryptOptions) (*Crypt, error) {
c := &Crypt{
collInfoFn: opts.CollInfoFn,
keyFn: opts.KeyFn,
markFn: opts.MarkFn,
BypassAutoEncryption: opts.BypassAutoEncryption,
}
mc, err := mongocrypt.NewMongoCrypt(createMongoCryptOptions(opts))
if err != nil {
return nil, err
}
c.mongoCrypt = mc
return c, nil
}
// Encrypt encrypts the given command.
func (c *Crypt) Encrypt(ctx context.Context, db string, cmd bsoncore.Document) (bsoncore.Document, error) {
if c.BypassAutoEncryption {
return cmd, nil
}
cryptCtx, err := c.mongoCrypt.CreateEncryptionContext(db, cmd)
if err != nil {
return nil, err
}
defer cryptCtx.Close()
return c.executeStateMachine(ctx, cryptCtx, db)
}
// Decrypt decrypts the given command response.
func (c *Crypt) Decrypt(ctx context.Context, cmdResponse bsoncore.Document) (bsoncore.Document, error) {
cryptCtx, err := c.mongoCrypt.CreateDecryptionContext(cmdResponse)
if err != nil {
return nil, err
}
defer cryptCtx.Close()
return c.executeStateMachine(ctx, cryptCtx, "")
}
// CreateDataKey creates a data key using the given KMS provider and options.
func (c *Crypt) CreateDataKey(ctx context.Context, kmsProvider string, opts *options.DataKeyOptions) (bsoncore.Document, error) {
cryptCtx, err := c.mongoCrypt.CreateDataKeyContext(kmsProvider, opts)
if err != nil {
return nil, err
}
defer cryptCtx.Close()
return c.executeStateMachine(ctx, cryptCtx, "")
}
// EncryptExplicit encrypts the given value with the given options.
func (c *Crypt) EncryptExplicit(ctx context.Context, val bsoncore.Value, opts *options.ExplicitEncryptionOptions) (byte, []byte, error) {
idx, doc := bsoncore.AppendDocumentStart(nil)
doc = bsoncore.AppendValueElement(doc, "v", val)
doc, _ = bsoncore.AppendDocumentEnd(doc, idx)
cryptCtx, err := c.mongoCrypt.CreateExplicitEncryptionContext(doc, opts)
if err != nil {
return 0, nil, err
}
defer cryptCtx.Close()
res, err := c.executeStateMachine(ctx, cryptCtx, "")
if err != nil {
return 0, nil, err
}
sub, data := res.Lookup("v").Binary()
return sub, data, nil
}
// DecryptExplicit decrypts the given encrypted value.
func (c *Crypt) DecryptExplicit(ctx context.Context, subtype byte, data []byte) (bsoncore.Value, error) {
idx, doc := bsoncore.AppendDocumentStart(nil)
doc = bsoncore.AppendBinaryElement(doc, "v", subtype, data)
doc, _ = bsoncore.AppendDocumentEnd(doc, idx)
cryptCtx, err := c.mongoCrypt.CreateExplicitDecryptionContext(doc)
if err != nil {
return bsoncore.Value{}, err
}
defer cryptCtx.Close()
res, err := c.executeStateMachine(ctx, cryptCtx, "")
if err != nil {
return bsoncore.Value{}, err
}
return res.Lookup("v"), nil
}
// Close cleans up any resources associated with the Crypt instance.
func (c *Crypt) Close() {
c.mongoCrypt.Close()
}
func (c *Crypt) executeStateMachine(ctx context.Context, cryptCtx *mongocrypt.Context, db string) (bsoncore.Document, error) {
var err error
for {
state := cryptCtx.State()
switch state {
case mongocrypt.NeedMongoCollInfo:
err = c.collectionInfo(ctx, cryptCtx, db)
case mongocrypt.NeedMongoMarkings:
err = c.markCommand(ctx, cryptCtx, db)
case mongocrypt.NeedMongoKeys:
err = c.retrieveKeys(ctx, cryptCtx)
case mongocrypt.NeedKms:
err = c.decryptKeys(ctx, cryptCtx)
case mongocrypt.Ready:
return cryptCtx.Finish()
default:
return nil, fmt.Errorf("invalid Crypt state: %v", state)
}
if err != nil {
return nil, err
}
}
}
func (c *Crypt) collectionInfo(ctx context.Context, cryptCtx *mongocrypt.Context, db string) error {
op, err := cryptCtx.NextOperation()
if err != nil {
return err
}
collInfo, err := c.collInfoFn(ctx, db, op)
if err != nil {
return err
}
if collInfo != nil {
if err = cryptCtx.AddOperationResult(collInfo); err != nil {
return err
}
}
return cryptCtx.CompleteOperation()
}
func (c *Crypt) markCommand(ctx context.Context, cryptCtx *mongocrypt.Context, db string) error {
op, err := cryptCtx.NextOperation()
if err != nil {
return err
}
markedCmd, err := c.markFn(ctx, db, op)
if err != nil {
return err
}
if err = cryptCtx.AddOperationResult(markedCmd); err != nil {
return err
}
return cryptCtx.CompleteOperation()
}
func (c *Crypt) retrieveKeys(ctx context.Context, cryptCtx *mongocrypt.Context) error {
op, err := cryptCtx.NextOperation()
if err != nil {
return err
}
keys, err := c.keyFn(ctx, op)
if err != nil {
return err
}
for _, key := range keys {
if err = cryptCtx.AddOperationResult(key); err != nil {
return err
}
}
return cryptCtx.CompleteOperation()
}
func (c *Crypt) decryptKeys(ctx context.Context, cryptCtx *mongocrypt.Context) error {
for {
kmsCtx := cryptCtx.NextKmsContext()
if kmsCtx == nil {
break
}
if err := c.decryptKey(ctx, kmsCtx); err != nil {
return err
}
}
return cryptCtx.FinishKmsContexts()
}
func (c *Crypt) decryptKey(ctx context.Context, kmsCtx *mongocrypt.KmsContext) error {
host, err := kmsCtx.HostName()
if err != nil {
return err
}
msg, err := kmsCtx.Message()
if err != nil {
return err
}
// add a port to the address if it's not already present
addr := host
if idx := strings.IndexByte(host, ':'); idx == -1 {
addr = fmt.Sprintf("%s:%d", host, defaultKmsPort)
}
conn, err := tls.Dial("tcp", addr, &tls.Config{})
if err != nil {
return err
}
defer func() {
_ = conn.Close()
}()
if err = conn.SetWriteDeadline(time.Now().Add(defaultKmsTimeout)); err != nil {
return err
}
if _, err = conn.Write(msg); err != nil {
return err
}
for {
bytesNeeded := kmsCtx.BytesNeeded()
if bytesNeeded == 0 {
return nil
}
res := make([]byte, bytesNeeded)
bytesRead, err := conn.Read(res)
if err != nil && err != io.EOF {
return err
}
if err = kmsCtx.FeedResponse(res[:bytesRead]); err != nil {
return err
}
}
}
func createMongoCryptOptions(opts *CryptOptions) *options.MongoCryptOptions {
mcOpts := options.MongoCrypt().SetLocalSchemaMap(opts.SchemaMap)
// KMS providers options
for provider, providerOpts := range opts.KmsProviders {
switch provider {
case "aws":
awsOpts := options.AwsKmsProvider()
if accessKey, ok := providerOpts["accessKeyId"]; ok {
if keyStr, ok := accessKey.(string); ok {
awsOpts.SetAccessKeyID(keyStr)
}
}
if secretAccessKey, ok := providerOpts["secretAccessKey"]; ok {
if keyStr, ok := secretAccessKey.(string); ok {
awsOpts.SetSecretAccessKey(keyStr)
}
}
mcOpts.SetAwsProviderOptions(awsOpts)
case "local":
localOpts := options.LocalKmsProvider()
if key, ok := providerOpts["key"]; ok {
if keyBytes, ok := key.([]byte); ok {
localOpts.SetMasterKey(keyBytes)
}
}
mcOpts.SetLocalProviderOptions(localOpts)
}
}
return mcOpts
}