mirror of
https://github.com/gravitational/teleport
synced 2024-10-22 02:03:24 +00:00
b79c4cffba
I know comments are very lacking right now. Once things are stable I will add proper comments. Minimal manual testing of the U2F registration API was done with a hardware U2F key. Some of the code may need to be cleaned up later to remove excessively long variable names... Currently we return an error rightaway if the username/password combo is wrong. It's difficult to do U2F without revealing either whether a user exists or whether the password is correct. Returning error immediately reveals whether the user/password combo is valid, while waiting until we get a signed response from the U2F device to announce whether the user/pass combo is valid can reveal which users exist since we need to return a keyHandle in the U2F SignRequest and generating fake keyHandles for nonexistent users can be difficult to get right since there is no rigid format for keyHandle.
460 lines
12 KiB
Go
460 lines
12 KiB
Go
/*
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Copyright 2015 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package web
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import (
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"io"
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"net/http"
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"sync"
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"time"
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"github.com/gravitational/teleport/lib/auth"
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"github.com/gravitational/teleport/lib/services"
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"github.com/gravitational/teleport/lib/session"
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"github.com/gravitational/teleport/lib/utils"
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log "github.com/Sirupsen/logrus"
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"github.com/gravitational/trace"
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"github.com/gravitational/ttlmap"
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"github.com/tstranex/u2f"
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)
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// SessionContext is a context associated with users'
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// web session, it stores connected client that persists
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// between requests for example to avoid connecting
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// to the auth server on every page hit
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type SessionContext struct {
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sync.Mutex
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*log.Entry
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sess *auth.Session
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user string
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clt *auth.TunClient
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parent *sessionCache
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closers []io.Closer
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}
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func (c *SessionContext) getConnectHandler(sessionID session.ID) (*connectHandler, error) {
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c.Lock()
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defer c.Unlock()
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for _, closer := range c.closers {
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handler, ok := closer.(*connectHandler)
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if ok && handler.req.SessionID == sessionID {
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return handler, nil
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}
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}
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return nil, trace.NotFound("no connected streams")
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}
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func (c *SessionContext) UpdateSessionTerminal(sessionID session.ID, params session.TerminalParams) error {
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err := c.clt.UpdateSession(session.UpdateRequest{ID: sessionID, TerminalParams: ¶ms})
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if err != nil {
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return trace.Wrap(err)
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}
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handler, err := c.getConnectHandler(sessionID)
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if err != nil {
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return trace.Wrap(err)
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}
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return trace.Wrap(handler.resizePTYWindow(params))
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}
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func (c *SessionContext) AddClosers(closers ...io.Closer) {
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c.Lock()
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defer c.Unlock()
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c.closers = append(c.closers, closers...)
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}
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func (c *SessionContext) TransferClosers() []io.Closer {
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c.Lock()
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defer c.Unlock()
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closers := c.closers
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c.closers = nil
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return closers
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}
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func (c *SessionContext) Invalidate() error {
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return c.parent.InvalidateSession(c)
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}
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// GetClient returns the client connected to the auth server
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func (c *SessionContext) GetClient() (auth.ClientI, error) {
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return c.clt, nil
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}
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// GetUser returns the authenticated teleport user
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func (c *SessionContext) GetUser() string {
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return c.user
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}
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// GetWebSession returns a web session
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func (c *SessionContext) GetWebSession() *auth.Session {
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return c.sess
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}
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// ExtendWebSession creates a new web session for this user
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// based on the previous session
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func (c *SessionContext) ExtendWebSession() (*auth.Session, error) {
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sess, err := c.clt.ExtendWebSession(c.user, c.sess.ID)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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return sess, nil
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}
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// GetAgent returns agent that can we used to answer challenges
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// for the web to ssh connection
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func (c *SessionContext) GetAgent() (auth.AgentCloser, error) {
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a, err := c.clt.GetAgent()
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if err != nil {
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return nil, trace.Wrap(err)
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}
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return a, nil
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}
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// Close cleans up connections associated with requests
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func (c *SessionContext) Close() error {
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closers := c.TransferClosers()
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for _, closer := range closers {
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c.Infof("closing %v", closer)
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closer.Close()
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}
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if c.clt != nil {
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return trace.Wrap(c.clt.Close())
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}
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return nil
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}
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// newSessionCache returns new instance of the session cache
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func newSessionCache(servers []utils.NetAddr) (*sessionCache, error) {
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m, err := ttlmap.New(1024, ttlmap.CallOnExpire(closeContext))
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if err != nil {
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return nil, err
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}
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cache := &sessionCache{
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contexts: m,
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authServers: servers,
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closer: utils.NewCloseBroadcaster(),
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}
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// periodically close expired and unused sessions
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go cache.expireSessions()
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return cache, nil
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}
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// sessionCache handles web session authentication,
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// and holds in memory contexts associated with each session
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type sessionCache struct {
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sync.Mutex
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contexts *ttlmap.TTLMap
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authServers []utils.NetAddr
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closer *utils.CloseBroadcaster
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}
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// Close closes all allocated resources and stops goroutines
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func (s *sessionCache) Close() error {
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log.Infof("[WEB] closing session cache")
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return s.closer.Close()
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}
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// closeContext is called when session context expires from
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// cache and will clean up connections
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func closeContext(key string, val interface{}) {
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go func() {
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log.Infof("[WEB] closing context %v", key)
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ctx, ok := val.(*SessionContext)
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if !ok {
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log.Warningf("warning, not valid value type %T", val)
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return
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}
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if err := ctx.Close(); err != nil {
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log.Infof("failed to close context: %v", err)
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}
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}()
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}
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func (s *sessionCache) expireSessions() {
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ticker := time.NewTicker(time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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s.clearExpiredSessions()
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case <-s.closer.C:
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return
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}
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}
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}
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func (s *sessionCache) clearExpiredSessions() {
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s.Lock()
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defer s.Unlock()
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expired := s.contexts.RemoveExpired(10)
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if expired != 0 {
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log.Infof("[WEB] removed %v expired sessions", expired)
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}
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}
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func (s *sessionCache) Auth(user, pass string, hotpToken string) (*auth.Session, error) {
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method, err := auth.NewWebPasswordAuth(user, []byte(pass), hotpToken)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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clt, err := auth.NewTunClient("web.client", s.authServers, user, method)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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// we are always closing this client, because we will not be using
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// this connection initiated using password based credentials
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// down the road, so it's a one call client
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defer clt.Close()
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session, err := clt.SignIn(user, []byte(pass))
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if err != nil {
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defer clt.Close()
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return nil, trace.Wrap(err)
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}
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return session, nil
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}
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func (s *sessionCache) GetU2fSignRequest(user, pass string) (*u2f.SignRequest, error) {
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method, err := auth.NewWebPasswordU2fSignAuth(user, []byte(pass))
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if err != nil {
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return nil, trace.Wrap(err)
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}
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clt, err := auth.NewTunClient("web.get-u2f-sign-request", s.authServers, user, method)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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// we are always closing this client, because we will not be using
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// this connection initiated using password based credentials
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// down the road, so it's a one call client
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defer clt.Close()
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u2fSignReq, err := clt.GetU2fSignRequest(user, []byte(pass))
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if err != nil {
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defer clt.Close()
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return nil, trace.Wrap(err)
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}
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return u2fSignReq, nil
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}
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func (s *sessionCache) GetCertificate(c createSSHCertReq) (*SSHLoginResponse, error) {
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method, err := auth.NewWebPasswordAuth(c.User, []byte(c.Password),
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c.HOTPToken)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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clt, err := auth.NewTunClient("web.session", s.authServers, c.User, method)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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defer clt.Close()
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cert, err := clt.GenerateUserCert(c.PubKey, c.User, c.TTL)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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hostSigners, err := clt.GetCertAuthorities(services.HostCA, false)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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signers := []services.CertAuthority{}
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for _, hs := range hostSigners {
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signers = append(signers, *hs)
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}
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return &SSHLoginResponse{
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Cert: cert,
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HostSigners: signers,
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}, nil
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}
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func (s *sessionCache) GetUserInviteInfo(token string) (user string,
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QRImg []byte, hotpFirstValues []string, e error) {
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method, err := auth.NewSignupTokenAuth(token)
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if err != nil {
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return "", nil, nil, trace.Wrap(err)
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}
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clt, err := auth.NewTunClient("web.get-user-invite", s.authServers, "tokenAuth", method)
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if err != nil {
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return "", nil, nil, trace.Wrap(err)
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}
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defer clt.Close()
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return clt.GetSignupTokenData(token)
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}
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func (s *sessionCache) GetUserInviteU2fRegisterRequest(token string) (u2fRegisterRequest *u2f.RegisterRequest, e error) {
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method, err := auth.NewSignupTokenAuth(token)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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clt, err := auth.NewTunClient("web.get-user-invite-u2f-register-request", s.authServers, "tokenAuth", method)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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defer clt.Close()
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return clt.GetSignupU2fRegisterRequest(token)
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}
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func (s *sessionCache) CreateNewUser(token, password, hotpToken string) (*auth.Session, error) {
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method, err := auth.NewSignupTokenAuth(token)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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clt, err := auth.NewTunClient("web.create-user", s.authServers, "tokenAuth", method)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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defer clt.Close()
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sess, err := clt.CreateUserWithToken(token, password, hotpToken)
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return sess, trace.Wrap(err)
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}
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func (s *sessionCache) CreateNewU2fUser(token string, password string, u2fRegisterResponse u2f.RegisterResponse) (*auth.Session, error) {
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method, err := auth.NewSignupTokenAuth(token)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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clt, err := auth.NewTunClient("web.create-u2f-user", s.authServers, "tokenAuth", method)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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defer clt.Close()
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sess, err := clt.CreateU2fUserWithToken(token, password, u2fRegisterResponse)
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return sess, trace.Wrap(err)
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}
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func (s *sessionCache) InvalidateSession(ctx *SessionContext) error {
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defer ctx.Close()
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if err := s.resetContext(ctx.GetUser(), ctx.GetWebSession().ID); err != nil {
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return trace.Wrap(err)
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}
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clt, err := ctx.GetClient()
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if err != nil {
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return trace.Wrap(err)
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}
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err = clt.DeleteWebSession(ctx.GetUser(), ctx.GetWebSession().ID)
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return trace.Wrap(err)
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}
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func (s *sessionCache) getContext(user, sid string) (*SessionContext, error) {
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s.Lock()
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defer s.Unlock()
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val, ok := s.contexts.Get(user + sid)
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if ok {
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return val.(*SessionContext), nil
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}
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return nil, trace.NotFound("sessionContext not found")
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}
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func (s *sessionCache) insertContext(user, sid string, ctx *SessionContext, ttl time.Duration) (*SessionContext, error) {
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s.Lock()
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defer s.Unlock()
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val, ok := s.contexts.Get(user + sid)
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if ok && val != nil { // nil means that we've just invalidated the context now and set it to nil in the cache
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return val.(*SessionContext), trace.AlreadyExists("exists")
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}
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if err := s.contexts.Set(user+sid, ctx, ttl); err != nil {
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return nil, trace.Wrap(err)
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}
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return ctx, nil
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}
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func (s *sessionCache) resetContext(user, sid string) error {
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s.Lock()
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defer s.Unlock()
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context, ok := s.contexts.Remove(user + sid)
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if ok {
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closeContext(user+sid, context)
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}
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return nil
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}
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func (s *sessionCache) ValidateSession(user, sid string) (*SessionContext, error) {
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ctx, err := s.getContext(user, sid)
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if err == nil {
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return ctx, nil
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}
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log.Debugf("ValidateSession(%s, %s)", user, sid)
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method, err := auth.NewWebSessionAuth(user, []byte(sid))
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if err != nil {
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return nil, trace.Wrap(err)
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}
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// Note: do not close this auth API client now. It will exist inside of "session context"
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clt, err := auth.NewTunClient("web.session-user", s.authServers, user, method)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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sess, err := clt.GetWebSessionInfo(user, sid)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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c := &SessionContext{
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clt: clt,
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user: user,
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sess: sess,
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parent: s,
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}
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c.Entry = log.WithFields(log.Fields{
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"user": user,
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"sess": sess.ID[:4],
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})
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out, err := s.insertContext(user, sid, c, auth.WebSessionTTL)
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if err != nil {
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// this means that someone has just inserted the context, so
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// close our extra context and return
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if trace.IsAlreadyExists(err) {
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log.Infof("just created, returning the existing one")
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defer c.Close()
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return out, nil
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}
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return nil, trace.Wrap(err)
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}
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return out, nil
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}
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func (s *sessionCache) SetSession(w http.ResponseWriter, user, sid string) error {
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d, err := EncodeCookie(user, sid)
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if err != nil {
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return err
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}
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c := &http.Cookie{
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Name: "session",
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Value: d,
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Path: "/",
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HttpOnly: true,
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Secure: true,
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}
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http.SetCookie(w, c)
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return nil
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}
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func (s *sessionCache) ClearSession(w http.ResponseWriter) {
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http.SetCookie(w, &http.Cookie{
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Name: "session",
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Value: "",
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Path: "/",
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HttpOnly: true,
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Secure: true,
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})
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}
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