/usr/share/gocode/src/github.com/mesos/mesos-go/auth/sasl/authenticatee.go is in golang-github-mesos-mesos-go-dev 0.0.2+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 | package sasl
import (
"errors"
"fmt"
"sync/atomic"
"github.com/gogo/protobuf/proto"
log "github.com/golang/glog"
"github.com/mesos/mesos-go/auth"
"github.com/mesos/mesos-go/auth/callback"
"github.com/mesos/mesos-go/auth/sasl/mech"
mesos "github.com/mesos/mesos-go/mesosproto"
"github.com/mesos/mesos-go/mesosutil/process"
"github.com/mesos/mesos-go/messenger"
"github.com/mesos/mesos-go/upid"
"golang.org/x/net/context"
)
var (
UnexpectedAuthenticationMechanisms = errors.New("Unexpected authentication 'mechanisms' received")
UnexpectedAuthenticationStep = errors.New("Unexpected authentication 'step' received")
UnexpectedAuthenticationCompleted = errors.New("Unexpected authentication 'completed' received")
UnexpectedAuthenticatorPid = errors.New("Unexpected authentator pid") // authenticator pid changed mid-process
UnsupportedMechanism = errors.New("failed to identify a compatible mechanism")
)
type statusType int32
const (
statusReady statusType = iota
statusStarting
statusStepping
_statusTerminal // meta status, should never be assigned: all status types following are "terminal"
statusCompleted
statusFailed
statusError
statusDiscarded
// this login provider name is automatically registered with the auth package; see init()
ProviderName = "SASL"
)
type authenticateeProcess struct {
transport messenger.Messenger
client upid.UPID
status statusType
done chan struct{}
err error
mech mech.Interface
stepFn mech.StepFunc
from *upid.UPID
handler callback.Handler
}
type authenticateeConfig struct {
client upid.UPID // pid of the client we're attempting to authenticate
handler callback.Handler
transport messenger.Messenger // mesos communications transport
}
type transportFactory interface {
makeTransport() messenger.Messenger
}
type transportFactoryFunc func() messenger.Messenger
func (f transportFactoryFunc) makeTransport() messenger.Messenger {
return f()
}
func init() {
factory := func(ctx context.Context) transportFactoryFunc {
return transportFactoryFunc(func() messenger.Messenger {
parent := auth.ParentUPID(ctx)
if parent == nil {
log.Fatal("expected to have a parent UPID in context")
}
process := process.New("sasl_authenticatee")
tpid := upid.UPID{
ID: process.Label(),
Host: parent.Host,
}
return messenger.NewHttpWithBindingAddress(tpid, BindingAddressFrom(ctx))
})
}
delegate := auth.AuthenticateeFunc(func(ctx context.Context, handler callback.Handler) error {
if impl, err := makeAuthenticatee(handler, factory(ctx)); err != nil {
return err
} else {
return impl.Authenticate(ctx, handler)
}
})
if err := auth.RegisterAuthenticateeProvider(ProviderName, delegate); err != nil {
log.Error(err)
}
}
func (s *statusType) get() statusType {
return statusType(atomic.LoadInt32((*int32)(s)))
}
func (s *statusType) swap(old, new statusType) bool {
return old != new && atomic.CompareAndSwapInt32((*int32)(s), int32(old), int32(new))
}
// build a new authenticatee implementation using the given callbacks and a new transport instance
func makeAuthenticatee(handler callback.Handler, factory transportFactory) (auth.Authenticatee, error) {
ip := callback.NewInterprocess()
if err := handler.Handle(ip); err != nil {
return nil, err
}
config := &authenticateeConfig{
client: ip.Client(),
handler: handler,
transport: factory.makeTransport(),
}
return auth.AuthenticateeFunc(func(ctx context.Context, handler callback.Handler) error {
ctx, auth := newAuthenticatee(ctx, config)
auth.authenticate(ctx, ip.Server())
select {
case <-ctx.Done():
return auth.discard(ctx)
case <-auth.done:
return auth.err
}
}), nil
}
// Terminate the authentication process upon context cancellation;
// only to be called if/when ctx.Done() has been signalled.
func (self *authenticateeProcess) discard(ctx context.Context) error {
err := ctx.Err()
status := statusFrom(ctx)
for ; status < _statusTerminal; status = (&self.status).get() {
if self.terminate(status, statusDiscarded, err) {
break
}
}
return err
}
func newAuthenticatee(ctx context.Context, config *authenticateeConfig) (context.Context, *authenticateeProcess) {
initialStatus := statusReady
proc := &authenticateeProcess{
transport: config.transport,
client: config.client,
handler: config.handler,
status: initialStatus,
done: make(chan struct{}),
}
ctx = withStatus(ctx, initialStatus)
err := proc.installHandlers(ctx)
if err == nil {
err = proc.startTransport()
}
if err != nil {
proc.terminate(initialStatus, statusError, err)
}
return ctx, proc
}
func (self *authenticateeProcess) startTransport() error {
if err := self.transport.Start(); err != nil {
return err
} else {
go func() {
// stop the authentication transport upon termination of the
// authenticator process
select {
case <-self.done:
log.V(2).Infof("stopping authenticator transport: %v", self.transport.UPID())
self.transport.Stop()
}
}()
}
return nil
}
// returns true when handlers are installed without error, otherwise terminates the
// authentication process.
func (self *authenticateeProcess) installHandlers(ctx context.Context) error {
type handlerFn func(ctx context.Context, from *upid.UPID, pbMsg proto.Message)
withContext := func(f handlerFn) messenger.MessageHandler {
return func(from *upid.UPID, m proto.Message) {
status := (&self.status).get()
if self.from != nil && !self.from.Equal(from) {
self.terminate(status, statusError, UnexpectedAuthenticatorPid)
} else {
f(withStatus(ctx, status), from, m)
}
}
}
// Anticipate mechanisms and steps from the server
handlers := []struct {
f handlerFn
m proto.Message
}{
{self.mechanisms, &mesos.AuthenticationMechanismsMessage{}},
{self.step, &mesos.AuthenticationStepMessage{}},
{self.completed, &mesos.AuthenticationCompletedMessage{}},
{self.failed, &mesos.AuthenticationFailedMessage{}},
{self.errored, &mesos.AuthenticationErrorMessage{}},
}
for _, h := range handlers {
if err := self.transport.Install(withContext(h.f), h.m); err != nil {
return err
}
}
return nil
}
// return true if the authentication status was updated (if true, self.done will have been closed)
func (self *authenticateeProcess) terminate(old, new statusType, err error) bool {
if (&self.status).swap(old, new) {
self.err = err
if self.mech != nil {
self.mech.Discard()
}
close(self.done)
return true
}
return false
}
func (self *authenticateeProcess) authenticate(ctx context.Context, pid upid.UPID) {
status := statusFrom(ctx)
if status != statusReady {
return
}
message := &mesos.AuthenticateMessage{
Pid: proto.String(self.client.String()),
}
if err := self.transport.Send(ctx, &pid, message); err != nil {
self.terminate(status, statusError, err)
} else {
(&self.status).swap(status, statusStarting)
}
}
func (self *authenticateeProcess) mechanisms(ctx context.Context, from *upid.UPID, pbMsg proto.Message) {
status := statusFrom(ctx)
if status != statusStarting {
self.terminate(status, statusError, UnexpectedAuthenticationMechanisms)
return
}
msg, ok := pbMsg.(*mesos.AuthenticationMechanismsMessage)
if !ok {
self.terminate(status, statusError, fmt.Errorf("Expected AuthenticationMechanismsMessage, not %T", pbMsg))
return
}
mechanisms := msg.GetMechanisms()
log.Infof("Received SASL authentication mechanisms: %v", mechanisms)
selectedMech, factory := mech.SelectSupported(mechanisms)
if selectedMech == "" {
self.terminate(status, statusError, UnsupportedMechanism)
return
}
if m, f, err := factory(self.handler); err != nil {
self.terminate(status, statusError, err)
return
} else {
self.mech = m
self.stepFn = f
self.from = from
}
// execute initialization step...
nextf, data, err := self.stepFn(self.mech, nil)
if err != nil {
self.terminate(status, statusError, err)
return
} else {
self.stepFn = nextf
}
message := &mesos.AuthenticationStartMessage{
Mechanism: proto.String(selectedMech),
Data: data, // may be nil, depends on init step
}
if err := self.transport.Send(ctx, from, message); err != nil {
self.terminate(status, statusError, err)
} else {
(&self.status).swap(status, statusStepping)
}
}
func (self *authenticateeProcess) step(ctx context.Context, from *upid.UPID, pbMsg proto.Message) {
status := statusFrom(ctx)
if status != statusStepping {
self.terminate(status, statusError, UnexpectedAuthenticationStep)
return
}
log.Info("Received SASL authentication step")
msg, ok := pbMsg.(*mesos.AuthenticationStepMessage)
if !ok {
self.terminate(status, statusError, fmt.Errorf("Expected AuthenticationStepMessage, not %T", pbMsg))
return
}
input := msg.GetData()
fn, output, err := self.stepFn(self.mech, input)
if err != nil {
self.terminate(status, statusError, fmt.Errorf("failed to perform authentication step: %v", err))
return
}
self.stepFn = fn
// We don't start the client with SASL_SUCCESS_DATA so we may
// need to send one more "empty" message to the server.
message := &mesos.AuthenticationStepMessage{}
if len(output) > 0 {
message.Data = output
}
if err := self.transport.Send(ctx, from, message); err != nil {
self.terminate(status, statusError, err)
}
}
func (self *authenticateeProcess) completed(ctx context.Context, from *upid.UPID, pbMsg proto.Message) {
status := statusFrom(ctx)
if status != statusStepping {
self.terminate(status, statusError, UnexpectedAuthenticationCompleted)
return
}
log.Info("Authentication success")
self.terminate(status, statusCompleted, nil)
}
func (self *authenticateeProcess) failed(ctx context.Context, from *upid.UPID, pbMsg proto.Message) {
status := statusFrom(ctx)
self.terminate(status, statusFailed, auth.AuthenticationFailed)
}
func (self *authenticateeProcess) errored(ctx context.Context, from *upid.UPID, pbMsg proto.Message) {
var err error
if msg, ok := pbMsg.(*mesos.AuthenticationErrorMessage); !ok {
err = fmt.Errorf("Expected AuthenticationErrorMessage, not %T", pbMsg)
} else {
err = fmt.Errorf("Authentication error: %s", msg.GetError())
}
status := statusFrom(ctx)
self.terminate(status, statusError, err)
}
|