macaroons

package module
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 Go to latest Published: Mar 22, 2023 License: MIT Imports: 19 Imported by: 0

README

Macaroons

This package makes the lnd/macaroons package a standalone go module.

Commit: 42099ef5.

CHANGELOG
  • Filename is provided as argument to NewService() instead of being hardcoded into a string variable.

Documentation

Index

Constants

View Source 
const (
	// RootKeyLen is the length of a root key.
	RootKeyLen = 32
)

Variables

View Source 
var (
	// RootKeyIDContextKey is the key to get rootKeyID from context.
	RootKeyIDContextKey = contextKey{"rootkeyid"}

	// ErrContextRootKeyID is used when the supplied context doesn't have
	// a root key ID.
	ErrContextRootKeyID = fmt.Errorf(
		"failed to read root key ID from context",
	)
)
View Source 
var (
	// ErrMissingRootKeyID specifies the root key ID is missing.
	ErrMissingRootKeyID = fmt.Errorf("missing root key ID")

	// ErrDeletionForbidden is used when attempting to delete the
	// DefaultRootKeyID or the encryptedKeyID.
	ErrDeletionForbidden = fmt.Errorf("the specified ID cannot be deleted")

	// PermissionEntityCustomURI is a special entity name for a permission
	// that does not describe an entity:action pair but instead specifies a
	// specific URI that needs to be granted access to. This can be used for
	// more fine-grained permissions where a macaroon only grants access to
	// certain methods instead of a whole list of methods that define the
	// same entity:action pairs.
	PermissionEntityCustomURI = "uri"
)
View Source 
var (

	// DefaultRootKeyID is the ID of the default root key. The first is
	// just 0, to emulate the memory storage that comes with bakery.
	DefaultRootKeyID = []byte("0")

	// ErrAlreadyUnlocked specifies that the store has already been
	// unlocked.
	ErrAlreadyUnlocked = fmt.Errorf("macaroon store already unlocked")

	// ErrStoreLocked specifies that the store needs to be unlocked with
	// a password.
	ErrStoreLocked = fmt.Errorf("macaroon store is locked")

	// ErrPasswordRequired specifies that a nil password has been passed.
	ErrPasswordRequired = fmt.Errorf("a non-nil password is required")

	// ErrKeyValueForbidden is used when the root key ID uses encryptedKeyID as
	// its value.
	ErrKeyValueForbidden = fmt.Errorf("root key ID value is not allowed")

	// ErrRootKeyBucketNotFound specifies that there is no macaroon root key
	// bucket yet which can/should only happen if the store has been
	// corrupted or was initialized incorrectly.
	ErrRootKeyBucketNotFound = fmt.Errorf("root key bucket not found")

	// ErrEncKeyNotFound specifies that there was no encryption key found
	// even if one was expected to be generated.
	ErrEncKeyNotFound = fmt.Errorf("macaroon encryption key not found")
)

Functions

func AddConstraints 

func AddConstraints(mac *macaroon.Macaroon, cs ...Constraint) (*macaroon.Macaroon, error)

AddConstraints returns new derived macaroon by applying every passed constraint and tightening its restrictions.

func ContextWithRootKeyID 

func ContextWithRootKeyID(ctx context.Context,
	value interface{}) context.Context

ContextWithRootKeyID passes the root key ID value to context.

func IPLockChecker 

func IPLockChecker() (string, checkers.Func)

IPLockChecker accepts client IP from the validation context and compares it with IP locked in the macaroon. It is of the `Checker` type.

func IPLockConstraint 

func IPLockConstraint(ipAddr string) func(*macaroon.Macaroon) error

IPLockConstraint locks macaroon to a specific IP address. If address is an empty string, this constraint does nothing to accommodate default value's desired behavior.

func RootKeyIDFromContext 

func RootKeyIDFromContext(ctx context.Context) ([]byte, error)

RootKeyIDFromContext retrieves the root key ID from context using the key RootKeyIDContextKey.

func TimeoutConstraint 

func TimeoutConstraint(seconds int64) func(*macaroon.Macaroon) error

TimeoutConstraint restricts the lifetime of the macaroon to the amount of seconds given.

Types

type Checker 

type Checker func() (string, checkers.Func)

Checker type adds a layer of indirection over macaroon checkers. A Checker returns the name of the checker and the checker function; these are used to register the function with the bakery service's compound checker.

type Constraint 

type Constraint func(*macaroon.Macaroon) error

Constraint type adds a layer of indirection over macaroon caveats.

type MacaroonCredential 

type MacaroonCredential struct {
	*macaroon.Macaroon
	// contains filtered or unexported fields
}

MacaroonCredential wraps a macaroon to implement the credentials.PerRPCCredentials interface.

func NewMacaroonCredential 

func NewMacaroonCredential(m *macaroon.Macaroon, withTLS bool) MacaroonCredential

NewMacaroonCredential returns a copy of the passed macaroon wrapped in a MacaroonCredential struct which implements PerRPCCredentials.

func (MacaroonCredential) GetRequestMetadata 

func (m MacaroonCredential) GetRequestMetadata(
	ctx context.Context, uri ...string,
) (map[string]string, error)

GetRequestMetadata implements the PerRPCCredentials interface. This method is required in order to pass the wrapped macaroon into the gRPC context. With this, the macaroon will be available within the request handling scope of the ultimate gRPC server implementation.

func (MacaroonCredential) RequireTransportSecurity 

func (m MacaroonCredential) RequireTransportSecurity() bool

RequireTransportSecurity implements the PerRPCCredentials interface.

type MacaroonValidator 

type MacaroonValidator interface {
	// ValidateMacaroon extracts the macaroon from the context's gRPC
	// metadata, checks its signature, makes sure all specified permissions
	// for the called method are contained within and finally ensures all
	// caveat conditions are met. A non-nil error is returned if any of the
	// checks fail.
	ValidateMacaroon(ctx context.Context,
		requiredPermissions []bakery.Op, fullMethod string) error
}

MacaroonValidator is an interface type that can check if macaroons are valid.

type RootKeyStorage 

type RootKeyStorage struct {
	kvdb.Backend
	// contains filtered or unexported fields
}

RootKeyStorage implements the bakery.RootKeyStorage interface.

func NewRootKeyStorage 

func NewRootKeyStorage(db kvdb.Backend) (*RootKeyStorage, error)

NewRootKeyStorage creates a RootKeyStorage instance. TODO(aakselrod): Add support for encryption of data with passphrase.

func (*RootKeyStorage) ChangePassword 

func (r *RootKeyStorage) ChangePassword(oldPw, newPw []byte) error

ChangePassword decrypts the macaroon root key with the old password and then encrypts it again with the new password.

func (*RootKeyStorage) Close 

func (r *RootKeyStorage) Close() error

Close closes the underlying database and zeroes the encryption key stored in memory.

func (*RootKeyStorage) CreateUnlock 

func (r *RootKeyStorage) CreateUnlock(password *[]byte) error

CreateUnlock sets an encryption key if one is not already set, otherwise it checks if the password is correct for the stored encryption key.

func (*RootKeyStorage) DeleteMacaroonID 

func (r *RootKeyStorage) DeleteMacaroonID(
	_ context.Context, rootKeyID []byte) ([]byte, error)

DeleteMacaroonID removes one specific root key ID. If the root key ID is found and deleted, it will be returned.

func (*RootKeyStorage) GenerateNewRootKey 

func (r *RootKeyStorage) GenerateNewRootKey() error

GenerateNewRootKey generates a new macaroon root key, replacing the previous root key if it existed.

func (*RootKeyStorage) Get 

func (r *RootKeyStorage) Get(_ context.Context, id []byte) ([]byte, error)

Get implements the Get method for the bakery.RootKeyStorage interface.

func (*RootKeyStorage) ListMacaroonIDs 

func (r *RootKeyStorage) ListMacaroonIDs(_ context.Context) ([][]byte, error)

ListMacaroonIDs returns all the root key ID values except the value of encryptedKeyID.

func (*RootKeyStorage) RootKey 

func (r *RootKeyStorage) RootKey(ctx context.Context) ([]byte, []byte, error)

RootKey implements the RootKey method for the bakery.RootKeyStorage interface.

type Service 

type Service struct {
	bakery.Bakery

	// ExternalValidators is a map between an absolute gRPC URIs and the
	// corresponding external macaroon validator to be used for that URI.
	// If no external validator for an URI is specified, the service will
	// use the internal validator.
	ExternalValidators map[string]MacaroonValidator

	// StatelessInit denotes if the service was initialized in the stateless
	// mode where no macaroon files should be created on disk.
	StatelessInit bool
	// contains filtered or unexported fields
}

Service encapsulates bakery.Bakery and adds a Close() method that zeroes the root key service encryption keys, as well as utility methods to validate a macaroon against the bakery and gRPC middleware for macaroon-based auth.

func NewService 

func NewService(
	datadir, location, filename string, statelessInit bool, checks ...Checker,
) (*Service, error)

NewService returns a service backed by the macaroon Bolt DB stored in the passed directory. The `checks` argument can be any of the `Checker` type functions defined in this package, or a custom checker if desired. This constructor prevents double-registration of checkers to prevent panics, so listing the same checker more than once is not harmful. Default checkers, such as those for `allow`, `time-before`, `declared`, and `error` caveats are registered automatically and don't need to be added.

func (*Service) ChangePassword 

func (svc *Service) ChangePassword(oldPw, newPw []byte) error

ChangePassword calls the underlying root key store's ChangePassword and returns the result.

func (*Service) Close 

func (svc *Service) Close() error

Close closes the database that underlies the RootKeyStore and zeroes the encryption keys.

func (*Service) CreateUnlock 

func (svc *Service) CreateUnlock(password *[]byte) error

CreateUnlock calls the underlying root key store's CreateUnlock and returns the result.

func (*Service) DeleteMacaroonID 

func (svc *Service) DeleteMacaroonID(ctxt context.Context,
	rootKeyID []byte) ([]byte, error)

DeleteMacaroonID removes one specific root key ID. If the root key ID is found and deleted, it will be returned.

func (*Service) GenerateNewRootKey 

func (svc *Service) GenerateNewRootKey() error

GenerateNewRootKey calls the underlying root key store's GenerateNewRootKey and returns the result.

func (*Service) ListMacaroonIDs 

func (svc *Service) ListMacaroonIDs(ctxt context.Context) ([][]byte, error)

ListMacaroonIDs returns all the root key ID values except the value of encryptedKeyID.

func (*Service) NewMacaroon 

func (svc *Service) NewMacaroon(
	ctx context.Context, rootKeyID []byte,
	ops ...bakery.Op) (*bakery.Macaroon, error)

NewMacaroon wraps around the function Oven.NewMacaroon with the defaults,

  • version is always bakery.LatestVersion;
  • caveats is always nil.

In addition, it takes a rootKeyID parameter, and puts it into the context. The context is passed through Oven.NewMacaroon(), in which calls the function RootKey(), that reads the context for rootKeyID.

func (*Service) RegisterExternalValidator 

func (svc *Service) RegisterExternalValidator(fullMethod string,
	validator MacaroonValidator) error

RegisterExternalValidator registers a custom, external macaroon validator for the specified absolute gRPC URI. That validator is then fully responsible to make sure any macaroon passed for a request to that URI is valid and satisfies all conditions.

func (*Service) ValidateMacaroon 

func (svc *Service) ValidateMacaroon(ctx context.Context,
	requiredPermissions []bakery.Op, fullMethod string) error

ValidateMacaroon validates the capabilities of a given request given a bakery service, context, and uri. Within the passed context.Context, we expect a macaroon to be encoded as request metadata using the key "macaroon".

Source Files

View all Source files

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