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dex/server/deviceflowhandlers.go

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package server
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"path"
"strconv"
"strings"
"time"
"golang.org/x/net/html"
"github.com/dexidp/dex/pkg/log"
"github.com/dexidp/dex/storage"
)
type deviceCodeResponse struct {
// The unique device code for device authentication
DeviceCode string `json:"device_code"`
// The code the user will exchange via a browser and log in
UserCode string `json:"user_code"`
// The url to verify the user code.
VerificationURI string `json:"verification_uri"`
// The verification uri with the user code appended for pre-filling form
VerificationURIComplete string `json:"verification_uri_complete"`
// The lifetime of the device code
ExpireTime int `json:"expires_in"`
// How often the device is allowed to poll to verify that the user login occurred
PollInterval int `json:"interval"`
}
func (s *Server) getDeviceVerificationURI() string {
return path.Join(s.issuerURL.Path, "/device/auth/verify_code")
}
func (s *Server) handleDeviceExchange(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case http.MethodGet:
// Grab the parameter(s) from the query.
// If "user_code" is set, pre-populate the user code text field.
// If "invalid" is set, set the invalidAttempt boolean, which will display a message to the user that they
// attempted to redeem an invalid or expired user code.
userCode := r.URL.Query().Get("user_code")
invalidAttempt, err := strconv.ParseBool(r.URL.Query().Get("invalid"))
if err != nil {
invalidAttempt = false
}
if err := s.templates.device(r, w, s.getDeviceVerificationURI(), userCode, invalidAttempt); err != nil {
s.logger.Errorf("Server template error: %v", err)
s.renderError(r, w, http.StatusNotFound, "Page not found")
}
default:
s.renderError(r, w, http.StatusBadRequest, "Requested resource does not exist.")
}
}
func (s *Server) handleDeviceCode(w http.ResponseWriter, r *http.Request) {
pollIntervalSeconds := 5
switch r.Method {
case http.MethodPost:
err := r.ParseForm()
if err != nil {
s.logger.Errorf("Could not parse Device Request body: %v", err)
s.tokenErrHelper(w, errInvalidRequest, "", http.StatusNotFound)
return
}
// Get the client id and scopes from the post
clientID := r.Form.Get("client_id")
clientSecret := r.Form.Get("client_secret")
scopes := strings.Fields(r.Form.Get("scope"))
s.logger.Infof("Received device request for client %v with scopes %v", clientID, scopes)
// Make device code
deviceCode := storage.NewDeviceCode()
// make user code
userCode := storage.NewUserCode()
// Generate the expire time
expireTime := time.Now().Add(s.deviceRequestsValidFor)
// Store the Device Request
deviceReq := storage.DeviceRequest{
UserCode: userCode,
DeviceCode: deviceCode,
ClientID: clientID,
ClientSecret: clientSecret,
Scopes: scopes,
Expiry: expireTime,
}
if err := s.storage.CreateDeviceRequest(deviceReq); err != nil {
s.logger.Errorf("Failed to store device request; %v", err)
s.tokenErrHelper(w, errInvalidRequest, "", http.StatusInternalServerError)
return
}
// Store the device token
deviceToken := storage.DeviceToken{
DeviceCode: deviceCode,
Status: deviceTokenPending,
Expiry: expireTime,
LastRequestTime: s.now(),
PollIntervalSeconds: 0,
}
if err := s.storage.CreateDeviceToken(deviceToken); err != nil {
s.logger.Errorf("Failed to store device token %v", err)
s.tokenErrHelper(w, errInvalidRequest, "", http.StatusInternalServerError)
return
}
u, err := url.Parse(s.issuerURL.String())
if err != nil {
s.logger.Errorf("Could not parse issuer URL %v", err)
s.tokenErrHelper(w, errInvalidRequest, "", http.StatusInternalServerError)
return
}
u.Path = path.Join(u.Path, "device")
vURI := u.String()
q := u.Query()
q.Set("user_code", userCode)
u.RawQuery = q.Encode()
vURIComplete := u.String()
code := deviceCodeResponse{
DeviceCode: deviceCode,
UserCode: userCode,
VerificationURI: vURI,
VerificationURIComplete: vURIComplete,
ExpireTime: int(s.deviceRequestsValidFor.Seconds()),
PollInterval: pollIntervalSeconds,
}
// Device Authorization Response can contain cache control header according to
// https://tools.ietf.org/html/rfc8628#section-3.2
w.Header().Set("Cache-Control", "no-store")
// Response type should be application/json according to
// https://datatracker.ietf.org/doc/html/rfc6749#section-5.1
w.Header().Set("Content-Type", "application/json")
enc := json.NewEncoder(w)
enc.SetEscapeHTML(false)
enc.SetIndent("", " ")
enc.Encode(code)
default:
s.renderError(r, w, http.StatusBadRequest, "Invalid device code request type")
s.tokenErrHelper(w, errInvalidRequest, "", http.StatusBadRequest)
}
}
func (s *Server) handleDeviceTokenDeprecated(w http.ResponseWriter, r *http.Request) {
log.Deprecated(s.logger, `The /device/token endpoint was called. It will be removed, use /token instead.`)
w.Header().Set("Content-Type", "application/json")
switch r.Method {
case http.MethodPost:
err := r.ParseForm()
if err != nil {
s.logger.Warnf("Could not parse Device Token Request body: %v", err)
s.tokenErrHelper(w, errInvalidRequest, "", http.StatusBadRequest)
return
}
grantType := r.PostFormValue("grant_type")
if grantType != grantTypeDeviceCode {
s.tokenErrHelper(w, errInvalidGrant, "", http.StatusBadRequest)
return
}
s.handleDeviceToken(w, r)
default:
s.renderError(r, w, http.StatusBadRequest, "Requested resource does not exist.")
}
}
func (s *Server) handleDeviceToken(w http.ResponseWriter, r *http.Request) {
deviceCode := r.Form.Get("device_code")
if deviceCode == "" {
s.tokenErrHelper(w, errInvalidRequest, "No device code received", http.StatusBadRequest)
return
}
now := s.now()
// Grab the device token, check validity
deviceToken, err := s.storage.GetDeviceToken(deviceCode)
if err != nil {
if err != storage.ErrNotFound {
s.logger.Errorf("failed to get device code: %v", err)
}
s.tokenErrHelper(w, errInvalidRequest, "Invalid Device code.", http.StatusBadRequest)
return
} else if now.After(deviceToken.Expiry) {
s.tokenErrHelper(w, deviceTokenExpired, "", http.StatusBadRequest)
return
}
// Rate Limiting check
slowDown := false
pollInterval := deviceToken.PollIntervalSeconds
minRequestTime := deviceToken.LastRequestTime.Add(time.Second * time.Duration(pollInterval))
if now.Before(minRequestTime) {
slowDown = true
// Continually increase the poll interval until the user waits the proper time
pollInterval += 5
} else {
pollInterval = 5
}
switch deviceToken.Status {
case deviceTokenPending:
updater := func(old storage.DeviceToken) (storage.DeviceToken, error) {
old.PollIntervalSeconds = pollInterval
old.LastRequestTime = now
return old, nil
}
// Update device token last request time in storage
if err := s.storage.UpdateDeviceToken(deviceCode, updater); err != nil {
s.logger.Errorf("failed to update device token: %v", err)
s.renderError(r, w, http.StatusInternalServerError, "")
return
}
if slowDown {
s.tokenErrHelper(w, deviceTokenSlowDown, "", http.StatusBadRequest)
} else {
s.tokenErrHelper(w, deviceTokenPending, "", http.StatusUnauthorized)
}
case deviceTokenComplete:
w.Write([]byte(deviceToken.Token))
}
}
func (s *Server) handleDeviceCallback(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case http.MethodGet:
userCode := r.FormValue("state")
code := r.FormValue("code")
if userCode == "" || code == "" {
s.renderError(r, w, http.StatusBadRequest, "Request was missing parameters")
return
}
// Authorization redirect callback from OAuth2 auth flow.
if errMsg := r.FormValue("error"); errMsg != "" {
// escape the message to prevent cross-site scripting
msg := html.EscapeString(errMsg + ": " + r.FormValue("error_description"))
http.Error(w, msg, http.StatusBadRequest)
return
}
authCode, err := s.storage.GetAuthCode(code)
if err != nil || s.now().After(authCode.Expiry) {
errCode := http.StatusBadRequest
if err != nil && err != storage.ErrNotFound {
s.logger.Errorf("failed to get auth code: %v", err)
errCode = http.StatusInternalServerError
}
s.renderError(r, w, errCode, "Invalid or expired auth code.")
return
}
// Grab the device request from storage
deviceReq, err := s.storage.GetDeviceRequest(userCode)
if err != nil || s.now().After(deviceReq.Expiry) {
errCode := http.StatusBadRequest
if err != nil && err != storage.ErrNotFound {
s.logger.Errorf("failed to get device code: %v", err)
errCode = http.StatusInternalServerError
}
s.renderError(r, w, errCode, "Invalid or expired user code.")
return
}
client, err := s.storage.GetClient(deviceReq.ClientID)
if err != nil {
if err != storage.ErrNotFound {
s.logger.Errorf("failed to get client: %v", err)
s.tokenErrHelper(w, errServerError, "", http.StatusInternalServerError)
} else {
s.tokenErrHelper(w, errInvalidClient, "Invalid client credentials.", http.StatusUnauthorized)
}
return
}
if client.Secret != deviceReq.ClientSecret {
s.tokenErrHelper(w, errInvalidClient, "Invalid client credentials.", http.StatusUnauthorized)
return
}
resp, err := s.exchangeAuthCode(w, authCode, client)
if err != nil {
s.logger.Errorf("Could not exchange auth code for client %q: %v", deviceReq.ClientID, err)
s.renderError(r, w, http.StatusInternalServerError, "Failed to exchange auth code.")
return
}
// Grab the device token from storage
old, err := s.storage.GetDeviceToken(deviceReq.DeviceCode)
if err != nil || s.now().After(old.Expiry) {
errCode := http.StatusBadRequest
if err != nil && err != storage.ErrNotFound {
s.logger.Errorf("failed to get device token: %v", err)
errCode = http.StatusInternalServerError
}
s.renderError(r, w, errCode, "Invalid or expired device code.")
return
}
updater := func(old storage.DeviceToken) (storage.DeviceToken, error) {
if old.Status == deviceTokenComplete {
return old, errors.New("device token already complete")
}
respStr, err := json.MarshalIndent(resp, "", " ")
if err != nil {
s.logger.Errorf("failed to marshal device token response: %v", err)
s.renderError(r, w, http.StatusInternalServerError, "")
return old, err
}
old.Token = string(respStr)
old.Status = deviceTokenComplete
return old, nil
}
// Update refresh token in the storage, store the token and mark as complete
if err := s.storage.UpdateDeviceToken(deviceReq.DeviceCode, updater); err != nil {
s.logger.Errorf("failed to update device token: %v", err)
s.renderError(r, w, http.StatusBadRequest, "")
return
}
if err := s.templates.deviceSuccess(r, w, client.Name); err != nil {
s.logger.Errorf("Server template error: %v", err)
s.renderError(r, w, http.StatusNotFound, "Page not found")
}
default:
http.Error(w, fmt.Sprintf("method not implemented: %s", r.Method), http.StatusBadRequest)
return
}
}
func (s *Server) verifyUserCode(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case http.MethodPost:
err := r.ParseForm()
if err != nil {
s.logger.Warnf("Could not parse user code verification request body : %v", err)
s.renderError(r, w, http.StatusBadRequest, "")
return
}
userCode := r.Form.Get("user_code")
if userCode == "" {
s.renderError(r, w, http.StatusBadRequest, "No user code received")
return
}
userCode = strings.ToUpper(userCode)
// Find the user code in the available requests
deviceRequest, err := s.storage.GetDeviceRequest(userCode)
if err != nil || s.now().After(deviceRequest.Expiry) {
if err != nil && err != storage.ErrNotFound {
s.logger.Errorf("failed to get device request: %v", err)
}
if err := s.templates.device(r, w, s.getDeviceVerificationURI(), userCode, true); err != nil {
s.logger.Errorf("Server template error: %v", err)
s.renderError(r, w, http.StatusNotFound, "Page not found")
}
return
}
// Redirect to Dex Auth Endpoint
authURL := path.Join(s.issuerURL.Path, "/auth")
u, err := url.Parse(authURL)
if err != nil {
s.renderError(r, w, http.StatusInternalServerError, "Invalid auth URI.")
return
}
q := u.Query()
q.Set("client_id", deviceRequest.ClientID)
q.Set("client_secret", deviceRequest.ClientSecret)
q.Set("state", deviceRequest.UserCode)
q.Set("response_type", "code")
q.Set("redirect_uri", "/device/callback")
q.Set("scope", strings.Join(deviceRequest.Scopes, " "))
u.RawQuery = q.Encode()
http.Redirect(w, r, u.String(), http.StatusFound)
default:
s.renderError(r, w, http.StatusBadRequest, "Requested resource does not exist.")
}
}