474 lines
14 KiB
Go
474 lines
14 KiB
Go
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// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package driver
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import (
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"context"
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"crypto/tls"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"strings"
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"time"
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"go.mongodb.org/mongo-driver/bson/bsontype"
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"go.mongodb.org/mongo-driver/internal"
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"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
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"go.mongodb.org/mongo-driver/x/mongo/driver/mongocrypt"
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"go.mongodb.org/mongo-driver/x/mongo/driver/mongocrypt/options"
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)
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const (
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defaultKmsPort = 443
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defaultKmsTimeout = 10 * time.Second
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)
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// CollectionInfoFn is a callback used to retrieve collection information.
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type CollectionInfoFn func(ctx context.Context, db string, filter bsoncore.Document) (bsoncore.Document, error)
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// KeyRetrieverFn is a callback used to retrieve keys from the key vault.
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type KeyRetrieverFn func(ctx context.Context, filter bsoncore.Document) ([]bsoncore.Document, error)
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// MarkCommandFn is a callback used to add encryption markings to a command.
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type MarkCommandFn func(ctx context.Context, db string, cmd bsoncore.Document) (bsoncore.Document, error)
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// CryptOptions specifies options to configure a Crypt instance.
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type CryptOptions struct {
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MongoCrypt *mongocrypt.MongoCrypt
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CollInfoFn CollectionInfoFn
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KeyFn KeyRetrieverFn
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MarkFn MarkCommandFn
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TLSConfig map[string]*tls.Config
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HTTPClient *http.Client
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BypassAutoEncryption bool
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BypassQueryAnalysis bool
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}
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// Crypt is an interface implemented by types that can encrypt and decrypt instances of
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// bsoncore.Document.
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//
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// Users should rely on the driver's crypt type (used by default) for encryption and decryption
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// unless they are perfectly confident in another implementation of Crypt.
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type Crypt interface {
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// Encrypt encrypts the given command.
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Encrypt(ctx context.Context, db string, cmd bsoncore.Document) (bsoncore.Document, error)
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// Decrypt decrypts the given command response.
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Decrypt(ctx context.Context, cmdResponse bsoncore.Document) (bsoncore.Document, error)
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// CreateDataKey creates a data key using the given KMS provider and options.
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CreateDataKey(ctx context.Context, kmsProvider string, opts *options.DataKeyOptions) (bsoncore.Document, error)
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// EncryptExplicit encrypts the given value with the given options.
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EncryptExplicit(ctx context.Context, val bsoncore.Value, opts *options.ExplicitEncryptionOptions) (byte, []byte, error)
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// DecryptExplicit decrypts the given encrypted value.
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DecryptExplicit(ctx context.Context, subtype byte, data []byte) (bsoncore.Value, error)
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// Close cleans up any resources associated with the Crypt instance.
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Close()
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// BypassAutoEncryption returns true if auto-encryption should be bypassed.
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BypassAutoEncryption() bool
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// RewrapDataKey attempts to rewrap the document data keys matching the filter, preparing the re-wrapped documents
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// to be returned as a slice of bsoncore.Document.
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RewrapDataKey(ctx context.Context, filter []byte, opts *options.RewrapManyDataKeyOptions) ([]bsoncore.Document, error)
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}
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// crypt consumes the libmongocrypt.MongoCrypt type to iterate the mongocrypt state machine and perform encryption
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// and decryption.
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type crypt struct {
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mongoCrypt *mongocrypt.MongoCrypt
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collInfoFn CollectionInfoFn
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keyFn KeyRetrieverFn
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markFn MarkCommandFn
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tlsConfig map[string]*tls.Config
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httpClient *http.Client
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bypassAutoEncryption bool
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}
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// NewCrypt creates a new Crypt instance configured with the given AutoEncryptionOptions.
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func NewCrypt(opts *CryptOptions) Crypt {
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c := &crypt{
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mongoCrypt: opts.MongoCrypt,
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collInfoFn: opts.CollInfoFn,
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keyFn: opts.KeyFn,
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markFn: opts.MarkFn,
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tlsConfig: opts.TLSConfig,
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httpClient: opts.HTTPClient,
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bypassAutoEncryption: opts.BypassAutoEncryption,
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}
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if c.httpClient == nil {
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c.httpClient = internal.DefaultHTTPClient
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}
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return c
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}
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// Encrypt encrypts the given command.
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func (c *crypt) Encrypt(ctx context.Context, db string, cmd bsoncore.Document) (bsoncore.Document, error) {
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if c.bypassAutoEncryption {
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return cmd, nil
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}
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cryptCtx, err := c.mongoCrypt.CreateEncryptionContext(db, cmd)
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if err != nil {
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return nil, err
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}
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defer cryptCtx.Close()
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return c.executeStateMachine(ctx, cryptCtx, db)
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}
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// Decrypt decrypts the given command response.
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func (c *crypt) Decrypt(ctx context.Context, cmdResponse bsoncore.Document) (bsoncore.Document, error) {
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cryptCtx, err := c.mongoCrypt.CreateDecryptionContext(cmdResponse)
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if err != nil {
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return nil, err
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}
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defer cryptCtx.Close()
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return c.executeStateMachine(ctx, cryptCtx, "")
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}
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// CreateDataKey creates a data key using the given KMS provider and options.
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func (c *crypt) CreateDataKey(ctx context.Context, kmsProvider string, opts *options.DataKeyOptions) (bsoncore.Document, error) {
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cryptCtx, err := c.mongoCrypt.CreateDataKeyContext(kmsProvider, opts)
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if err != nil {
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return nil, err
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}
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defer cryptCtx.Close()
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return c.executeStateMachine(ctx, cryptCtx, "")
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}
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// RewrapDataKey attempts to rewrap the document data keys matching the filter, preparing the re-wrapped documents to
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// be returned as a slice of bsoncore.Document.
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func (c *crypt) RewrapDataKey(ctx context.Context, filter []byte,
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opts *options.RewrapManyDataKeyOptions) ([]bsoncore.Document, error) {
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cryptCtx, err := c.mongoCrypt.RewrapDataKeyContext(filter, opts)
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if err != nil {
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return nil, err
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}
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defer cryptCtx.Close()
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rewrappedBSON, err := c.executeStateMachine(ctx, cryptCtx, "")
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if err != nil {
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return nil, err
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}
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if rewrappedBSON == nil {
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return nil, nil
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}
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// mongocrypt_ctx_rewrap_many_datakey_init wraps the documents in a BSON of the form { "v": [(BSON document), ...] }
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// where each BSON document in the slice is a document containing a rewrapped datakey.
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rewrappedDocumentBytes, err := rewrappedBSON.LookupErr("v")
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if err != nil {
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return nil, err
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}
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// Parse the resulting BSON as individual documents.
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rewrappedDocsArray, ok := rewrappedDocumentBytes.ArrayOK()
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if !ok {
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return nil, fmt.Errorf("expected results from mongocrypt_ctx_rewrap_many_datakey_init to be an array")
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}
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rewrappedDocumentValues, err := rewrappedDocsArray.Values()
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if err != nil {
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return nil, err
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}
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rewrappedDocuments := []bsoncore.Document{}
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for _, rewrappedDocumentValue := range rewrappedDocumentValues {
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if rewrappedDocumentValue.Type != bsontype.EmbeddedDocument {
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// If a value in the document's array returned by mongocrypt is anything other than an embedded document,
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// then something is wrong and we should terminate the routine.
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return nil, fmt.Errorf("expected value of type %q, got: %q",
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bsontype.EmbeddedDocument.String(),
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rewrappedDocumentValue.Type.String())
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}
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rewrappedDocuments = append(rewrappedDocuments, rewrappedDocumentValue.Document())
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}
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return rewrappedDocuments, nil
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}
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// EncryptExplicit encrypts the given value with the given options.
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func (c *crypt) EncryptExplicit(ctx context.Context, val bsoncore.Value, opts *options.ExplicitEncryptionOptions) (byte, []byte, error) {
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idx, doc := bsoncore.AppendDocumentStart(nil)
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doc = bsoncore.AppendValueElement(doc, "v", val)
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doc, _ = bsoncore.AppendDocumentEnd(doc, idx)
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cryptCtx, err := c.mongoCrypt.CreateExplicitEncryptionContext(doc, opts)
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if err != nil {
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return 0, nil, err
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}
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defer cryptCtx.Close()
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res, err := c.executeStateMachine(ctx, cryptCtx, "")
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if err != nil {
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return 0, nil, err
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}
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sub, data := res.Lookup("v").Binary()
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return sub, data, nil
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}
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// DecryptExplicit decrypts the given encrypted value.
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func (c *crypt) DecryptExplicit(ctx context.Context, subtype byte, data []byte) (bsoncore.Value, error) {
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idx, doc := bsoncore.AppendDocumentStart(nil)
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doc = bsoncore.AppendBinaryElement(doc, "v", subtype, data)
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doc, _ = bsoncore.AppendDocumentEnd(doc, idx)
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cryptCtx, err := c.mongoCrypt.CreateExplicitDecryptionContext(doc)
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if err != nil {
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return bsoncore.Value{}, err
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}
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defer cryptCtx.Close()
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res, err := c.executeStateMachine(ctx, cryptCtx, "")
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if err != nil {
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return bsoncore.Value{}, err
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}
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return res.Lookup("v"), nil
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}
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// Close cleans up any resources associated with the Crypt instance.
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func (c *crypt) Close() {
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c.mongoCrypt.Close()
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if c.httpClient == internal.DefaultHTTPClient {
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internal.CloseIdleHTTPConnections(c.httpClient)
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}
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}
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func (c *crypt) BypassAutoEncryption() bool {
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return c.bypassAutoEncryption
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}
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func (c *crypt) executeStateMachine(ctx context.Context, cryptCtx *mongocrypt.Context, db string) (bsoncore.Document, error) {
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var err error
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for {
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state := cryptCtx.State()
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switch state {
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case mongocrypt.NeedMongoCollInfo:
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err = c.collectionInfo(ctx, cryptCtx, db)
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case mongocrypt.NeedMongoMarkings:
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err = c.markCommand(ctx, cryptCtx, db)
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case mongocrypt.NeedMongoKeys:
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err = c.retrieveKeys(ctx, cryptCtx)
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case mongocrypt.NeedKms:
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err = c.decryptKeys(cryptCtx)
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case mongocrypt.Ready:
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return cryptCtx.Finish()
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case mongocrypt.Done:
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return nil, nil
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case mongocrypt.NeedKmsCredentials:
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err = c.provideKmsProviders(ctx, cryptCtx)
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default:
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return nil, fmt.Errorf("invalid Crypt state: %v", state)
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}
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if err != nil {
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return nil, err
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}
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}
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}
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func (c *crypt) collectionInfo(ctx context.Context, cryptCtx *mongocrypt.Context, db string) error {
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op, err := cryptCtx.NextOperation()
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if err != nil {
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return err
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}
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collInfo, err := c.collInfoFn(ctx, db, op)
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if err != nil {
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return err
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}
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if collInfo != nil {
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if err = cryptCtx.AddOperationResult(collInfo); err != nil {
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return err
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}
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}
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return cryptCtx.CompleteOperation()
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}
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func (c *crypt) markCommand(ctx context.Context, cryptCtx *mongocrypt.Context, db string) error {
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op, err := cryptCtx.NextOperation()
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if err != nil {
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return err
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}
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markedCmd, err := c.markFn(ctx, db, op)
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if err != nil {
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return err
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}
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if err = cryptCtx.AddOperationResult(markedCmd); err != nil {
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return err
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}
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return cryptCtx.CompleteOperation()
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}
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func (c *crypt) retrieveKeys(ctx context.Context, cryptCtx *mongocrypt.Context) error {
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op, err := cryptCtx.NextOperation()
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if err != nil {
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return err
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}
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keys, err := c.keyFn(ctx, op)
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if err != nil {
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return err
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}
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for _, key := range keys {
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if err = cryptCtx.AddOperationResult(key); err != nil {
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return err
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}
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}
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return cryptCtx.CompleteOperation()
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}
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func (c *crypt) decryptKeys(cryptCtx *mongocrypt.Context) error {
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for {
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kmsCtx := cryptCtx.NextKmsContext()
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if kmsCtx == nil {
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break
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}
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if err := c.decryptKey(kmsCtx); err != nil {
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return err
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}
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}
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return cryptCtx.FinishKmsContexts()
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}
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func (c *crypt) decryptKey(kmsCtx *mongocrypt.KmsContext) error {
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host, err := kmsCtx.HostName()
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if err != nil {
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return err
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}
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msg, err := kmsCtx.Message()
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if err != nil {
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return err
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}
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// add a port to the address if it's not already present
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addr := host
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if idx := strings.IndexByte(host, ':'); idx == -1 {
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addr = fmt.Sprintf("%s:%d", host, defaultKmsPort)
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}
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kmsProvider := kmsCtx.KMSProvider()
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tlsCfg := c.tlsConfig[kmsProvider]
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if tlsCfg == nil {
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tlsCfg = &tls.Config{MinVersion: tls.VersionTLS12}
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}
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conn, err := tls.Dial("tcp", addr, tlsCfg)
|
||
|
|
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
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// needsKmsProvider returns true if provider was initially set to an empty document.
|
||
|
|
// An empty document signals the driver to fetch credentials.
|
||
|
|
func needsKmsProvider(kmsProviders bsoncore.Document, provider string) bool {
|
||
|
|
val, err := kmsProviders.LookupErr(provider)
|
||
|
|
if err != nil {
|
||
|
|
// KMS provider is not configured.
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
doc, ok := val.DocumentOK()
|
||
|
|
// KMS provider is an empty document.
|
||
|
|
return ok && len(doc) == 5
|
||
|
|
}
|
||
|
|
|
||
|
|
func getGCPAccessToken(ctx context.Context, httpClient *http.Client) (string, error) {
|
||
|
|
metadataHost := "metadata.google.internal"
|
||
|
|
if envhost := os.Getenv("GCE_METADATA_HOST"); envhost != "" {
|
||
|
|
metadataHost = envhost
|
||
|
|
}
|
||
|
|
url := fmt.Sprintf("http://%s/computeMetadata/v1/instance/service-accounts/default/token", metadataHost)
|
||
|
|
req, err := http.NewRequest("GET", url, nil)
|
||
|
|
if err != nil {
|
||
|
|
return "", internal.WrapErrorf(err, "unable to retrieve GCP credentials")
|
||
|
|
}
|
||
|
|
req.Header.Set("Metadata-Flavor", "Google")
|
||
|
|
resp, err := httpClient.Do(req.WithContext(ctx))
|
||
|
|
if err != nil {
|
||
|
|
return "", internal.WrapErrorf(err, "unable to retrieve GCP credentials")
|
||
|
|
}
|
||
|
|
defer resp.Body.Close()
|
||
|
|
body, err := ioutil.ReadAll(resp.Body)
|
||
|
|
if err != nil {
|
||
|
|
return "", internal.WrapErrorf(err, "unable to retrieve GCP credentials: error reading response body")
|
||
|
|
}
|
||
|
|
if resp.StatusCode != http.StatusOK {
|
||
|
|
return "", internal.WrapErrorf(err, "unable to retrieve GCP credentials: expected StatusCode 200, got StatusCode: %v. Response body: %s", resp.StatusCode, body)
|
||
|
|
}
|
||
|
|
var tokenResponse struct {
|
||
|
|
AccessToken string `json:"access_token"`
|
||
|
|
}
|
||
|
|
// Attempt to read body as JSON
|
||
|
|
err = json.Unmarshal(body, &tokenResponse)
|
||
|
|
if err != nil {
|
||
|
|
return "", internal.WrapErrorf(err, "unable to retrieve GCP credentials: error reading body JSON. Response body: %s", body)
|
||
|
|
}
|
||
|
|
if tokenResponse.AccessToken == "" {
|
||
|
|
return "", fmt.Errorf("unable to retrieve GCP credentials: got unexpected empty accessToken from GCP Metadata Server. Response body: %s", body)
|
||
|
|
}
|
||
|
|
return tokenResponse.AccessToken, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *crypt) provideKmsProviders(ctx context.Context, cryptCtx *mongocrypt.Context) error {
|
||
|
|
kmsProviders := c.mongoCrypt.GetKmsProviders()
|
||
|
|
builder := bsoncore.NewDocumentBuilder()
|
||
|
|
|
||
|
|
if needsKmsProvider(kmsProviders, "gcp") {
|
||
|
|
// "gcp" KMS provider is an empty document.
|
||
|
|
// Attempt to fetch from GCP Instance Metadata server.
|
||
|
|
{
|
||
|
|
token, err := getGCPAccessToken(ctx, c.httpClient)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
builder.StartDocument("gcp").
|
||
|
|
AppendString("accessToken", token).
|
||
|
|
FinishDocument()
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return cryptCtx.ProvideKmsProviders(builder.Build())
|
||
|
|
}
|