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sessions.go
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/
sessions.go
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/*
Copyright 2015 Gravitational, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package web
import (
"io"
"net/http"
"sync"
"time"
"github.com/gravitational/teleport"
"github.com/gravitational/teleport/lib/auth"
"github.com/gravitational/teleport/lib/services"
"github.com/gravitational/teleport/lib/session"
"github.com/gravitational/teleport/lib/utils"
log "github.com/Sirupsen/logrus"
"github.com/gravitational/trace"
"github.com/mailgun/ttlmap"
)
// sessionContext is a context associated with users'
// web session, it stores connected client that persists
// between requests for example to avoid connecting
// to the auth server on every page hit
type sessionContext struct {
sync.Mutex
*log.Entry
sess *auth.Session
user string
clt *auth.TunClient
parent *sessionCache
closers []io.Closer
}
func (c *sessionContext) getConnectHandler(sessionID session.ID) (*connectHandler, error) {
c.Lock()
defer c.Unlock()
for _, closer := range c.closers {
handler, ok := closer.(*connectHandler)
if ok && handler.req.SessionID == sessionID {
return handler, nil
}
}
return nil, trace.Wrap(teleport.NotFound("no connected streams"))
}
func (c *sessionContext) UpdateSessionTerminal(sessionID session.ID, params session.TerminalParams) error {
err := c.clt.UpdateSession(session.UpdateRequest{ID: sessionID, TerminalParams: ¶ms})
if err != nil {
return trace.Wrap(err)
}
handler, err := c.getConnectHandler(sessionID)
if err != nil {
return trace.Wrap(err)
}
return trace.Wrap(handler.resizePTYWindow(params))
}
func (c *sessionContext) AddClosers(closers ...io.Closer) {
c.Lock()
defer c.Unlock()
c.closers = append(c.closers, closers...)
}
func (c *sessionContext) TransferClosers() []io.Closer {
c.Lock()
defer c.Unlock()
closers := c.closers
c.closers = nil
return closers
}
func (c *sessionContext) Invalidate() error {
return c.parent.InvalidateSession(c)
}
// GetClient returns the client connected to the auth server
func (c *sessionContext) GetClient() (auth.ClientI, error) {
return c.clt, nil
}
// GetUser returns the authenticated teleport user
func (c *sessionContext) GetUser() string {
return c.user
}
// GetWebSession returns a web session
func (c *sessionContext) GetWebSession() *auth.Session {
return c.sess
}
// CreateNewWebSession creates a new web session for this user
// based on the previous session
func (c *sessionContext) CreateWebSession() (*auth.Session, error) {
sess, err := c.clt.CreateWebSession(c.user, c.sess.ID)
if err != nil {
return nil, trace.Wrap(err)
}
return sess, nil
}
// GetAgent returns agent that can we used to answer challenges
// for the web to ssh connection
func (c *sessionContext) GetAgent() (auth.AgentCloser, error) {
a, err := c.clt.GetAgent()
if err != nil {
return nil, trace.Wrap(err)
}
return a, nil
}
// Close cleans up connections associated with requests
func (c *sessionContext) Close() error {
closers := c.TransferClosers()
for _, closer := range closers {
c.Infof("closing %v", closer)
closer.Close()
}
if c.clt != nil {
return trace.Wrap(c.clt.Close())
}
return nil
}
// newSessionHandler returns new instance of the session handler
func newSessionHandler(secure bool, servers []utils.NetAddr) (*sessionCache, error) {
m, err := ttlmap.NewMap(1024, ttlmap.CallOnExpire(closeContext))
if err != nil {
return nil, err
}
return &sessionCache{
contexts: m,
authServers: servers,
}, nil
}
// sessionCache handles web session authentication,
// and holds in memory contexts associated with each session
type sessionCache struct {
sync.Mutex
secure bool
contexts *ttlmap.TtlMap
authServers []utils.NetAddr
}
// closeContext is called when session context expires from
// cache and will clean up connections
func closeContext(key string, val interface{}) {
log.Infof("closing context %v", key)
ctx := val.(*sessionContext)
if err := ctx.Close(); err != nil {
log.Infof("failed to close context: %v", err)
}
}
func (s *sessionCache) Auth(user, pass string, hotpToken string) (*auth.Session, error) {
method, err := auth.NewWebPasswordAuth(user, []byte(pass), hotpToken)
if err != nil {
return nil, trace.Wrap(err)
}
clt, err := auth.NewTunClient(s.authServers, user, method)
if err != nil {
return nil, trace.Wrap(err)
}
return clt.SignIn(user, []byte(pass))
}
func (s *sessionCache) GetCertificate(c createSSHCertReq) (*SSHLoginResponse, error) {
method, err := auth.NewWebPasswordAuth(c.User, []byte(c.Password),
c.HOTPToken)
if err != nil {
return nil, trace.Wrap(err)
}
clt, err := auth.NewTunClient(s.authServers, c.User, method)
if err != nil {
return nil, trace.Wrap(err)
}
cert, err := clt.GenerateUserCert(c.PubKey, c.User, c.TTL)
if err != nil {
return nil, trace.Wrap(err)
}
hostSigners, err := clt.GetCertAuthorities(services.HostCA)
if err != nil {
return nil, trace.Wrap(err)
}
signers := []services.CertAuthority{}
for _, hs := range hostSigners {
signers = append(signers, *hs)
}
return &SSHLoginResponse{
Cert: cert,
HostSigners: signers,
}, nil
}
func (s *sessionCache) GetUserInviteInfo(token string) (user string,
QRImg []byte, hotpFirstValues []string, e error) {
method, err := auth.NewSignupTokenAuth(token)
if err != nil {
return "", nil, nil, trace.Wrap(err)
}
clt, err := auth.NewTunClient(s.authServers, "tokenAuth", method)
if err != nil {
return "", nil, nil, trace.Wrap(err)
}
return clt.GetSignupTokenData(token)
}
func (s *sessionCache) CreateNewUser(token, password, hotpToken string) (*auth.Session, error) {
method, err := auth.NewSignupTokenAuth(token)
if err != nil {
return nil, trace.Wrap(err)
}
clt, err := auth.NewTunClient(s.authServers, "tokenAuth", method)
if err != nil {
return nil, trace.Wrap(err)
}
sess, err := clt.CreateUserWithToken(token, password, hotpToken)
return sess, trace.Wrap(err)
}
func (s *sessionCache) InvalidateSession(ctx *sessionContext) error {
defer ctx.Close()
if err := s.resetContext(ctx.GetUser(), ctx.GetWebSession().ID); err != nil {
return trace.Wrap(err)
}
clt, err := ctx.GetClient()
if err != nil {
return trace.Wrap(err)
}
err = clt.DeleteWebSession(ctx.GetUser(), ctx.GetWebSession().ID)
return trace.Wrap(err)
}
func (s *sessionCache) getContext(user, sid string) (*sessionContext, error) {
s.Lock()
defer s.Unlock()
val, ok := s.contexts.Get(user + sid)
if ok {
return val.(*sessionContext), nil
}
return nil, trace.Wrap(teleport.NotFound("sessionContext not found"))
}
func (s *sessionCache) insertContext(user, sid string, ctx *sessionContext, ttl time.Duration) (*sessionContext, error) {
s.Lock()
defer s.Unlock()
val, ok := s.contexts.Get(user + sid)
if ok && val != nil { // nil means that we've just invalidated the context now and set it to nil in the cache
return val.(*sessionContext), trace.Wrap(&teleport.AlreadyExistsError{})
}
if err := s.contexts.Set(user+sid, ctx, int(ttl/time.Second)); err != nil {
return nil, trace.Wrap(err)
}
return ctx, nil
}
func (s *sessionCache) resetContext(user, sid string) error {
s.Lock()
defer s.Unlock()
return trace.Wrap(s.contexts.Set(user+sid, nil, 1))
}
func (s *sessionCache) ValidateSession(user, sid string) (*sessionContext, error) {
ctx, err := s.getContext(user, sid)
if err == nil {
return ctx, nil
}
method, err := auth.NewWebSessionAuth(user, []byte(sid))
if err != nil {
return nil, trace.Wrap(err)
}
clt, err := auth.NewTunClient(s.authServers, user, method)
if err != nil {
return nil, trace.Wrap(err)
}
sess, err := clt.GetWebSessionInfo(user, sid)
if err != nil {
return nil, trace.Wrap(err)
}
c := &sessionContext{
clt: clt,
user: user,
sess: sess,
parent: s,
}
c.Entry = log.WithFields(log.Fields{
"user": user,
"sess": sess.ID[:4],
})
out, err := s.insertContext(user, sid, c, auth.WebSessionTTL)
if err != nil {
// this means that someone has just inserted the context, so
// close our extra context and return
if teleport.IsAlreadyExists(err) {
log.Infof("just created, returning the existing one")
defer c.Close()
return out, nil
}
return nil, trace.Wrap(err)
}
return out, nil
}
func (s *sessionCache) SetSession(w http.ResponseWriter, user, sid string) error {
d, err := EncodeCookie(user, sid)
if err != nil {
return err
}
c := &http.Cookie{
Name: "session",
Value: d,
Path: "/",
HttpOnly: true,
Secure: s.secure,
}
http.SetCookie(w, c)
return nil
}
func (s *sessionCache) ClearSession(w http.ResponseWriter) {
http.SetCookie(w, &http.Cookie{
Name: "session",
Value: "",
Path: "/",
HttpOnly: true,
Secure: s.secure,
})
}