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handler.go
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handler.go
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package external
import (
"encoding/base64"
"errors"
"fmt"
"net/http"
"net/url"
"github.com/RangelReale/osincli"
"github.com/golang/glog"
"k8s.io/apiserver/pkg/authentication/authenticator"
"k8s.io/apiserver/pkg/authentication/user"
authapi "github.com/openshift/origin/pkg/auth/api"
"github.com/openshift/origin/pkg/auth/oauth/handlers"
"github.com/openshift/origin/pkg/auth/server/csrf"
)
// Handler exposes an external oauth provider flow (including the call back) as an oauth.handlers.AuthenticationHandler to allow our internal oauth
// server to use an external oauth provider for authentication
type Handler struct {
provider Provider
state State
clientConfig *osincli.ClientConfig
client *osincli.Client
success handlers.AuthenticationSuccessHandler
errorHandler handlers.AuthenticationErrorHandler
mapper authapi.UserIdentityMapper
}
func NewExternalOAuthRedirector(provider Provider, state State, redirectURL string, success handlers.AuthenticationSuccessHandler, errorHandler handlers.AuthenticationErrorHandler, mapper authapi.UserIdentityMapper) (handlers.AuthenticationRedirector, http.Handler, error) {
clientConfig, err := provider.NewConfig()
if err != nil {
return nil, nil, err
}
clientConfig.RedirectUrl = redirectURL
client, err := osincli.NewClient(clientConfig)
if err != nil {
return nil, nil, err
}
transport, err := provider.GetTransport()
if err != nil {
return nil, nil, err
}
client.Transport = transport
handler := &Handler{
provider: provider,
state: state,
clientConfig: clientConfig,
client: client,
success: success,
errorHandler: errorHandler,
mapper: mapper,
}
return handler, handler, nil
}
// AuthenticationRedirect implements oauth.handlers.RedirectAuthHandler
func (h *Handler) AuthenticationRedirect(w http.ResponseWriter, req *http.Request) error {
glog.V(4).Infof("Authentication needed for %v", h)
authReq := h.client.NewAuthorizeRequest(osincli.CODE)
h.provider.AddCustomParameters(authReq)
state, err := h.state.Generate(w, req)
if err != nil {
glog.V(4).Infof("Error generating state: %v", err)
return err
}
oauthURL := authReq.GetAuthorizeUrlWithParams(state)
glog.V(4).Infof("redirect to %v", oauthURL)
http.Redirect(w, req, oauthURL.String(), http.StatusFound)
return nil
}
func NewOAuthPasswordAuthenticator(provider Provider, mapper authapi.UserIdentityMapper) (authenticator.Password, error) {
clientConfig, err := provider.NewConfig()
if err != nil {
return nil, err
}
// unused for password grants
clientConfig.RedirectUrl = "/"
client, err := osincli.NewClient(clientConfig)
if err != nil {
return nil, err
}
transport, err := provider.GetTransport()
if err != nil {
return nil, err
}
client.Transport = transport
return &Handler{
provider: provider,
clientConfig: clientConfig,
client: client,
mapper: mapper,
}, nil
}
func (h *Handler) AuthenticatePassword(username, password string) (user.Info, bool, error) {
// Exchange password for a token
accessReq := h.client.NewAccessRequest(osincli.PASSWORD, &osincli.AuthorizeData{Username: username, Password: password})
accessData, err := accessReq.GetToken()
if err != nil {
if oauthErr, ok := err.(*osincli.Error); ok && oauthErr.Id == "invalid_grant" {
// An invalid_grant error means the username/password was rejected
return nil, false, nil
}
glog.V(4).Infof("Error getting access token using resource owner password grant: %v", err)
return nil, false, err
}
glog.V(5).Infof("Got access data for %s", username)
identity, ok, err := h.provider.GetUserIdentity(accessData)
if err != nil {
glog.V(4).Infof("Error getting userIdentityInfo info: %v", err)
return nil, false, err
}
if !ok {
glog.V(4).Infof("Could not get userIdentityInfo info from access token")
err := errors.New("Could not get userIdentityInfo info from access token")
return nil, false, err
}
user, err := h.mapper.UserFor(identity)
glog.V(5).Infof("Got userIdentityMapping: %#v", user)
if err != nil {
glog.V(4).Infof("Error creating or updating mapping for: %#v due to %v", identity, err)
return nil, false, err
}
return user, true, nil
}
// ServeHTTP handles the callback request in response to an external oauth flow
func (h *Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// Extract auth code
authReq := h.client.NewAuthorizeRequest(osincli.CODE)
authData, err := authReq.HandleRequest(req)
if err != nil {
glog.V(4).Infof("Error handling request: %v", err)
h.handleError(err, w, req)
return
}
glog.V(4).Infof("Got auth data")
// Validate state before making any server-to-server calls
ok, err := h.state.Check(authData.State, req)
if !ok {
glog.V(4).Infof("State is invalid")
err := errors.New("State is invalid")
h.handleError(err, w, req)
return
}
if err != nil {
glog.V(4).Infof("Error verifying state: %v", err)
h.handleError(err, w, req)
return
}
// Exchange code for a token
accessReq := h.client.NewAccessRequest(osincli.AUTHORIZATION_CODE, authData)
accessData, err := accessReq.GetToken()
if err != nil {
glog.V(4).Infof("Error getting access token: %v", err)
h.handleError(err, w, req)
return
}
glog.V(5).Infof("Got access data")
identity, ok, err := h.provider.GetUserIdentity(accessData)
if err != nil {
glog.V(4).Infof("Error getting userIdentityInfo info: %v", err)
h.handleError(err, w, req)
return
}
if !ok {
glog.V(4).Infof("Could not get userIdentityInfo info from access token")
err := errors.New("Could not get userIdentityInfo info from access token")
h.handleError(err, w, req)
return
}
user, err := h.mapper.UserFor(identity)
glog.V(5).Infof("Got userIdentityMapping: %#v", user)
if err != nil {
glog.V(4).Infof("Error creating or updating mapping for: %#v due to %v", identity, err)
h.handleError(err, w, req)
return
}
_, err = h.success.AuthenticationSucceeded(user, authData.State, w, req)
if err != nil {
glog.V(4).Infof("Error calling success handler: %v", err)
h.handleError(err, w, req)
return
}
}
func (h *Handler) handleError(err error, w http.ResponseWriter, req *http.Request) {
handled, err := h.errorHandler.AuthenticationError(err, w, req)
if handled {
return
}
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(`An error occurred`))
}
// defaultState provides default state-building, validation, and parsing to contain CSRF and "then" redirection
type defaultState struct {
csrf csrf.CSRF
}
// RedirectorState combines state generation/verification with redirections on authentication success and error
type RedirectorState interface {
State
handlers.AuthenticationSuccessHandler
handlers.AuthenticationErrorHandler
}
func CSRFRedirectingState(csrf csrf.CSRF) RedirectorState {
return &defaultState{csrf}
}
func (d *defaultState) Generate(w http.ResponseWriter, req *http.Request) (string, error) {
then := req.URL.String()
if len(then) == 0 {
return "", errors.New("Cannot generate state: request has no URL")
}
csrfToken, err := d.csrf.Generate(w, req)
if err != nil {
return "", err
}
state := url.Values{
"csrf": {csrfToken},
"then": {then},
}
return encodeState(state)
}
func (d *defaultState) Check(state string, req *http.Request) (bool, error) {
values, err := decodeState(state)
if err != nil {
return false, err
}
csrf := values.Get("csrf")
ok, err := d.csrf.Check(req, csrf)
if err != nil {
return false, err
}
if !ok {
return false, fmt.Errorf("State did not contain a valid CSRF token")
}
then := values.Get("then")
if then == "" {
return false, errors.New("State did not contain a redirect")
}
return true, nil
}
func (d *defaultState) AuthenticationSucceeded(user user.Info, state string, w http.ResponseWriter, req *http.Request) (bool, error) {
values, err := decodeState(state)
if err != nil {
return false, err
}
then := values.Get("then")
if len(then) == 0 {
return false, errors.New("No redirect given")
}
http.Redirect(w, req, then, http.StatusFound)
return true, nil
}
// AuthenticationError handles the very specific case where the remote OAuth provider returned an error
// In that case, attempt to redirect to the "then" URL with all error parameters echoed
// In any other case, or if an error is encountered, returns false and the original error
func (d *defaultState) AuthenticationError(err error, w http.ResponseWriter, req *http.Request) (bool, error) {
// only handle errors that came from the remote OAuth provider...
osinErr, ok := err.(*osincli.Error)
if !ok {
return false, err
}
// with an OAuth error...
if len(osinErr.Id) == 0 {
return false, err
}
// if they embedded valid state...
ok, stateErr := d.Check(osinErr.State, req)
if !ok || stateErr != nil {
return false, err
}
// if the state decodes...
values, err := decodeState(osinErr.State)
if err != nil {
return false, err
}
// if it contains a redirect...
then := values.Get("then")
if len(then) == 0 {
return false, err
}
// which parses...
thenURL, urlErr := url.Parse(then)
if urlErr != nil {
return false, err
}
// Add in the error, error_description, error_uri params to the "then" redirect
q := thenURL.Query()
q.Set("error", osinErr.Id)
if len(osinErr.Description) > 0 {
q.Set("error_description", osinErr.Description)
}
if len(osinErr.URI) > 0 {
q.Set("error_uri", osinErr.URI)
}
thenURL.RawQuery = q.Encode()
http.Redirect(w, req, thenURL.String(), http.StatusFound)
return true, nil
}
// URL-encode, then base-64 encode for OAuth providers that don't do a good job of treating the state param like an opaque value
func encodeState(values url.Values) (string, error) {
return base64.URLEncoding.EncodeToString([]byte(values.Encode())), nil
}
func decodeState(state string) (url.Values, error) {
decodedState, err := base64.URLEncoding.DecodeString(state)
if err != nil {
return nil, err
}
return url.ParseQuery(string(decodedState))
}