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session.go
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session.go
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// Package session provides in-memory storage of secure session details.
package session
import (
"errors"
"fmt"
"sync"
"github.com/manifoldco/go-base64"
"github.com/manifoldco/torus-cli/apitypes"
"github.com/manifoldco/torus-cli/daemon/crypto/secure"
"github.com/manifoldco/torus-cli/envelope"
"github.com/manifoldco/torus-cli/identity"
)
const notLoggedInError = "Please login to perform that command"
type session struct {
mutex *sync.Mutex
sessionType apitypes.SessionType
// XXX: These should be scoped down to an interface that can do auth stuff.
identity envelope.Envelope
auth envelope.Envelope
// sensitive values and the guard
guard *secure.Guard
token *secure.Secret
passphrase *secure.Secret
}
// Session is the interface for access to secure session details.
type Session interface {
Type() apitypes.SessionType
Set(apitypes.SessionType, envelope.Envelope, envelope.Envelope, []byte, []byte) error
SetIdentity(apitypes.SessionType, envelope.Envelope, envelope.Envelope) error
ID() *identity.ID
AuthID() *identity.ID
Token() []byte
Passphrase() []byte
MasterKey() (*base64.Value, error)
HasToken() bool
HasPassphrase() bool
Logout() error
String() string
Self() *apitypes.Self
}
// NewSession returns the default implementation of the Session interface
// for a user or machine depending on the passed type.
func NewSession(guard *secure.Guard) Session {
return &session{
mutex: &sync.Mutex{},
sessionType: apitypes.NotLoggedIn,
guard: guard,
}
}
// Type returns the type of identity this session represents (e.g. user or
// machine)
func (s *session) Type() apitypes.SessionType {
return s.sessionType
}
// ID returns the ID representing the Identity providing object (e.g. user or
// machine)
func (s *session) ID() *identity.ID {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.identity == nil {
return nil
}
return s.identity.GetID()
}
// AuthID returns the ID representing the object used for authorization (e.g.
// user or machine token).
func (s *session) AuthID() *identity.ID {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.auth == nil {
return nil
}
return s.auth.GetID()
}
// Token returns the auth token stored in this session.
func (s *session) Token() []byte {
s.mutex.Lock()
defer s.mutex.Unlock()
return s.token.Buffer()
}
// Passphrase returns the user's passphrase.
func (s *session) Passphrase() []byte {
s.mutex.Lock()
defer s.mutex.Unlock()
return s.passphrase.Buffer()
}
func (s *session) HasToken() bool {
return s.token != nil
}
func (s *session) HasPassphrase() bool {
return s.passphrase != nil
}
// String implements the fmt.Stringer interface.
func (s *session) String() string {
s.mutex.Lock()
defer s.mutex.Unlock()
return fmt.Sprintf("Session{type:%s,token:%t,passphrase:%t}",
s.Type(), s.HasToken(), s.HasPassphrase())
}
func checkSessionType(sessionType apitypes.SessionType, identity, auth envelope.Envelope) error {
if identity == nil || auth == nil {
return errors.New("identity and auth cannot be null")
}
switch sessionType {
case apitypes.UserSession:
if _, ok := identity.(envelope.UserInf); !ok {
return errors.New("Identity must be a user object")
}
if _, ok := auth.(envelope.UserInf); !ok {
return errors.New("Auth must be a user object")
}
case apitypes.MachineSession:
if _, ok := identity.(*envelope.Machine); !ok {
return errors.New("Identity must be machine object")
}
if _, ok := auth.(*envelope.MachineToken); !ok {
return errors.New("Auth must be a machine token object")
}
default:
panic("did not recognize session type")
}
return nil
}
// Set atomically sets all relevant session details.
//
// It returns an error if any values are empty.
func (s *session) Set(sessionType apitypes.SessionType, identity, auth envelope.Envelope,
passphrase []byte, token []byte) error {
s.mutex.Lock()
defer s.mutex.Unlock()
err := checkSessionType(sessionType, identity, auth)
if err != nil {
return err
}
if len(passphrase) == 0 {
return errors.New("Passphrase must not be empty")
}
if len(token) == 0 && sessionType == apitypes.UserSession {
return errors.New("Token must not be empty")
}
s.sessionType = sessionType
s.passphrase, err = s.guard.Secret(passphrase)
if err != nil {
return err
}
s.token, err = s.guard.Secret(token)
if err != nil {
return err
}
s.identity = identity
s.auth = auth
return nil
}
// SetIdentity updates the session identity
func (s *session) SetIdentity(sessionType apitypes.SessionType, identity, auth envelope.Envelope) error {
s.mutex.Lock()
defer s.mutex.Unlock()
err := checkSessionType(sessionType, identity, auth)
if err != nil {
return err
}
s.identity = identity
s.auth = auth
return nil
}
func createNotLoggedInError() error {
return &apitypes.Error{
Type: apitypes.UnauthorizedError,
Err: []string{notLoggedInError},
}
}
// Returns the base64 representation of the identities encrypted master key
func (s *session) MasterKey() (*base64.Value, error) {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.Type() == apitypes.NotLoggedIn {
return nil, createNotLoggedInError()
}
if s.Type() == apitypes.UserSession {
return s.auth.(envelope.UserInf).Master().Value, nil
}
return s.auth.(*envelope.MachineToken).Body.Master.Value, nil
}
// Self returns the Self apitype which represents the current sessions state
func (s *session) Self() *apitypes.Self {
return &apitypes.Self{
Type: s.Type(),
Identity: s.identity,
Auth: s.auth,
}
}
// Logout resets all values to the logged out state
func (s *session) Logout() error {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.Type() == apitypes.NotLoggedIn {
return createNotLoggedInError()
}
s.sessionType = apitypes.NotLoggedIn
s.identity = nil
s.auth = nil
s.token.Destroy()
s.passphrase.Destroy()
s.token = nil
s.passphrase = nil
return nil
}