mirror of
https://github.com/pomerium/pomerium.git
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proxy: add userinfo and webauthn endpoints (#3755)
* proxy: add userinfo and webauthn endpoints * use TLD for RP id * use EffectiveTLDPlusOne * upgrade webauthn * fix test * Update internal/handlers/jwks.go Co-authored-by: bobby <1544881+desimone@users.noreply.github.com> Co-authored-by: bobby <1544881+desimone@users.noreply.github.com>
This commit is contained in:
Caleb Doxsey
GitHub
parent
81053ac8ef
commit
c1a522cd82
33 changed files with 498 additions and 216 deletions
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@ -1,550 +0,0 @@
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// Package webauthn contains handlers for the WebAuthn flow in authenticate.
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package webauthn
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import (
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"bytes"
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"context"
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"encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"net/url"
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"github.com/google/uuid"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"google.golang.org/protobuf/types/known/timestamppb"
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"github.com/pomerium/pomerium/internal/encoding/jws"
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"github.com/pomerium/pomerium/internal/httputil"
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"github.com/pomerium/pomerium/internal/middleware"
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"github.com/pomerium/pomerium/internal/sessions"
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"github.com/pomerium/pomerium/internal/urlutil"
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"github.com/pomerium/pomerium/pkg/cryptutil"
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"github.com/pomerium/pomerium/pkg/grpc/databroker"
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"github.com/pomerium/pomerium/pkg/grpc/device"
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"github.com/pomerium/pomerium/pkg/grpc/session"
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"github.com/pomerium/pomerium/pkg/grpc/user"
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"github.com/pomerium/pomerium/pkg/webauthnutil"
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"github.com/pomerium/pomerium/ui"
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"github.com/pomerium/webauthn"
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)
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const maxAuthenticateResponses = 5
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var (
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errMissingDeviceCredentialID = httputil.NewError(http.StatusBadRequest, errors.New(
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urlutil.QueryDeviceCredentialID+" is a required parameter"))
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errMissingDeviceType = httputil.NewError(http.StatusBadRequest, errors.New(
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urlutil.QueryDeviceType+" is a required parameter"))
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errMissingRedirectURI = httputil.NewError(http.StatusBadRequest, errors.New(
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urlutil.QueryRedirectURI+" is a required parameter"))
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errInvalidDeviceCredential = httputil.NewError(http.StatusBadRequest, errors.New(
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"invalid device credential"))
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)
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// State is the state needed by the Handler to handle requests.
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type State struct {
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AuthenticateURL *url.URL
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InternalAuthenticateURL *url.URL
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Client databroker.DataBrokerServiceClient
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PomeriumDomains []string
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RelyingParty *webauthn.RelyingParty
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Session *session.Session
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SessionState *sessions.State
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SessionStore sessions.SessionStore
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SharedKey []byte
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BrandingOptions httputil.BrandingOptions
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}
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// A StateProvider provides state for the handler.
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type StateProvider = func(context.Context) (*State, error)
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// Handler is the WebAuthn device handler.
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type Handler struct {
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getState StateProvider
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}
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// New creates a new Handler.
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func New(getState StateProvider) *Handler {
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return &Handler{
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getState: getState,
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}
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}
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// GetOptions returns the creation and request options for WebAuthn.
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func (h *Handler) GetOptions(ctx context.Context) (
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creationOptions *webauthn.PublicKeyCredentialCreationOptions,
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requestOptions *webauthn.PublicKeyCredentialRequestOptions,
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err error,
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) {
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state, err := h.getState(ctx)
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if err != nil {
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return nil, nil, err
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}
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return h.getOptions(ctx, state, webauthnutil.DefaultDeviceType)
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}
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// ServeHTTP serves the HTTP handler.
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func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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httputil.HandlerFunc(h.handle).ServeHTTP(w, r)
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}
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func (h *Handler) getOptions(ctx context.Context, state *State, deviceTypeParam string) (
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creationOptions *webauthn.PublicKeyCredentialCreationOptions,
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requestOptions *webauthn.PublicKeyCredentialRequestOptions,
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err error,
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) {
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// get the user information
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u, err := user.Get(ctx, state.Client, state.Session.GetUserId())
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if err != nil {
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return nil, nil, err
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}
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// get the device credentials
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knownDeviceCredentials, err := getKnownDeviceCredentials(ctx, state.Client, u.GetDeviceCredentialIds()...)
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if err != nil {
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return nil, nil, err
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}
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// get the stored device type
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deviceType := webauthnutil.GetDeviceType(ctx, state.Client, deviceTypeParam)
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creationOptions = webauthnutil.GenerateCreationOptions(state.SharedKey, deviceType, u)
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requestOptions = webauthnutil.GenerateRequestOptions(state.SharedKey, deviceType, knownDeviceCredentials)
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return creationOptions, requestOptions, nil
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}
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func (h *Handler) handle(w http.ResponseWriter, r *http.Request) error {
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s, err := h.getState(r.Context())
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if err != nil {
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return err
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}
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err = middleware.ValidateRequestURL(
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urlutil.GetExternalRequest(s.InternalAuthenticateURL, s.AuthenticateURL, r),
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s.SharedKey,
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)
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if err != nil {
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return err
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}
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switch {
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case r.Method == "GET":
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return h.handleView(w, r, s)
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case r.FormValue("action") == "authenticate":
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return h.handleAuthenticate(w, r, s)
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case r.FormValue("action") == "register":
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return h.handleRegister(w, r, s)
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case r.FormValue("action") == "unregister":
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return h.handleUnregister(w, r, s)
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}
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return httputil.NewError(http.StatusNotFound, errors.New(http.StatusText(http.StatusNotFound)))
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}
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func (h *Handler) handleAuthenticate(w http.ResponseWriter, r *http.Request, state *State) error {
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ctx := r.Context()
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deviceTypeParam := r.FormValue(urlutil.QueryDeviceType)
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if deviceTypeParam == "" {
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return errMissingDeviceType
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}
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redirectURIParam := r.FormValue(urlutil.QueryRedirectURI)
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if redirectURIParam == "" {
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return errMissingRedirectURI
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}
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responseParam := r.FormValue("authenticate_response")
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var credential webauthn.PublicKeyAssertionCredential
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err := json.Unmarshal([]byte(responseParam), &credential)
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if err != nil {
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return httputil.NewError(http.StatusBadRequest, errors.New("invalid authenticate response"))
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}
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credentialJSON, err := json.Marshal(credential)
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if err != nil {
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return err
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}
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// Set the UserHandle which won't typically be filled in by the client
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credential.Response.UserHandle = webauthnutil.GetUserEntityID(state.Session.GetUserId())
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// get the user information
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u, err := user.Get(ctx, state.Client, state.Session.GetUserId())
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if err != nil {
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return fmt.Errorf("error retrieving user record: %w", err)
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}
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// get the stored device type
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deviceType := webauthnutil.GetDeviceType(ctx, state.Client, deviceTypeParam)
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// get the device credentials
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knownDeviceCredentials, err := getKnownDeviceCredentials(ctx, state.Client, u.GetDeviceCredentialIds()...)
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if err != nil {
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return fmt.Errorf("error retrieving webauthn known device credentials: %w", err)
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}
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requestOptions, err := webauthnutil.GetRequestOptionsForCredential(
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state.SharedKey,
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deviceType,
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knownDeviceCredentials,
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&credential,
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)
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if err != nil {
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return httputil.NewError(http.StatusBadRequest, fmt.Errorf("invalid register options: %w", err))
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}
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serverCredential, err := state.RelyingParty.VerifyAuthenticationCeremony(
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ctx,
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requestOptions,
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&credential,
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)
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if err != nil {
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return httputil.NewError(http.StatusBadRequest, fmt.Errorf("error verifying registration: %w", err))
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}
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// store the authenticate response
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for _, deviceCredential := range knownDeviceCredentials {
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webauthnCredential := deviceCredential.GetWebauthn()
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if webauthnCredential == nil {
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continue
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}
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if !bytes.Equal(webauthnCredential.Id, serverCredential.ID) {
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continue
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}
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// add the response to the list and cap it, removing the oldest responses
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webauthnCredential.AuthenticateResponse = append(webauthnCredential.AuthenticateResponse, credentialJSON)
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for len(webauthnCredential.AuthenticateResponse) > maxAuthenticateResponses {
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webauthnCredential.AuthenticateResponse = webauthnCredential.AuthenticateResponse[1:]
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}
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// store the updated device credential
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err = device.PutCredential(ctx, state.Client, deviceCredential)
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if err != nil {
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return err
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}
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}
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// update the session
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state.Session.DeviceCredentials = append(state.Session.DeviceCredentials, &session.Session_DeviceCredential{
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TypeId: deviceType.GetId(),
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Credential: &session.Session_DeviceCredential_Id{
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Id: webauthnutil.GetDeviceCredentialID(serverCredential.ID),
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},
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})
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return h.saveSessionAndRedirect(w, r, state, redirectURIParam)
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}
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func (h *Handler) handleRegister(w http.ResponseWriter, r *http.Request, state *State) error {
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ctx := r.Context()
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deviceTypeParam := r.FormValue(urlutil.QueryDeviceType)
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if deviceTypeParam == "" {
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return errMissingDeviceType
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}
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redirectURIParam := r.FormValue(urlutil.QueryRedirectURI)
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if redirectURIParam == "" {
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return errMissingRedirectURI
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}
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responseParam := r.FormValue("register_response")
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var credential webauthn.PublicKeyCreationCredential
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err := json.Unmarshal([]byte(responseParam), &credential)
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if err != nil {
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return httputil.NewError(http.StatusBadRequest, errors.New("invalid register response"))
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}
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credentialJSON, err := json.Marshal(credential)
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if err != nil {
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return err
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}
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// get the user information
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u, err := user.Get(ctx, state.Client, state.Session.GetUserId())
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if err != nil {
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return fmt.Errorf("error retrieving user record: %w", err)
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}
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// get the stored device type
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deviceType := webauthnutil.GetDeviceType(ctx, state.Client, deviceTypeParam)
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creationOptions, err := webauthnutil.GetCreationOptionsForCredential(
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state.SharedKey,
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deviceType,
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u,
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&credential,
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)
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if err != nil {
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return httputil.NewError(http.StatusBadRequest, fmt.Errorf("invalid register options: %w", err))
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}
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creationOptionsJSON, err := json.Marshal(creationOptions)
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if err != nil {
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return err
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}
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serverCredential, err := state.RelyingParty.VerifyRegistrationCeremony(
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ctx,
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creationOptions,
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&credential,
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)
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if err != nil {
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return httputil.NewError(http.StatusBadRequest, fmt.Errorf("error verifying registration: %w", err))
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}
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deviceCredentialID := webauthnutil.GetDeviceCredentialID(serverCredential.ID)
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deviceEnrollment, err := getOrCreateDeviceEnrollment(ctx, r, state, deviceType.GetId(), deviceCredentialID, u)
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if err != nil {
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return err
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}
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// save the credential
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deviceCredential := &device.Credential{
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Id: deviceCredentialID,
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TypeId: deviceType.GetId(),
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EnrollmentId: deviceEnrollment.GetId(),
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UserId: u.GetId(),
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Specifier: &device.Credential_Webauthn{
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Webauthn: &device.Credential_WebAuthn{
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Id: serverCredential.ID,
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PublicKey: serverCredential.PublicKey,
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RegisterOptions: creationOptionsJSON,
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RegisterResponse: credentialJSON,
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},
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},
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}
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err = device.PutCredential(ctx, state.Client, deviceCredential)
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if err != nil {
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return err
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}
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// save the user
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u.AddDeviceCredentialID(deviceCredential.GetId())
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_, err = databroker.Put(ctx, state.Client, u)
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if err != nil {
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return err
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}
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// update the session
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state.Session.DeviceCredentials = append(state.Session.DeviceCredentials, &session.Session_DeviceCredential{
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TypeId: deviceType.GetId(),
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Credential: &session.Session_DeviceCredential_Id{
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Id: webauthnutil.GetDeviceCredentialID(serverCredential.ID),
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},
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})
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return h.saveSessionAndRedirect(w, r, state, redirectURIParam)
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}
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func (h *Handler) handleUnregister(w http.ResponseWriter, r *http.Request, state *State) error {
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ctx := r.Context()
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// get the user information
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u, err := user.Get(ctx, state.Client, state.Session.GetUserId())
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if err != nil {
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return err
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}
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deviceCredentialID := r.FormValue(urlutil.QueryDeviceCredentialID)
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if deviceCredentialID == "" {
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return errMissingDeviceCredentialID
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}
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// ensure we only allow removing a device credential the user owns
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if !u.HasDeviceCredentialID(deviceCredentialID) {
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return errInvalidDeviceCredential
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}
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// delete the credential
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deviceCredential, err := device.DeleteCredential(ctx, state.Client, deviceCredentialID)
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if err != nil {
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return err
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}
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// delete the corresponding enrollment
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_, err = device.DeleteEnrollment(ctx, state.Client, deviceCredential.GetEnrollmentId())
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if err != nil {
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return err
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}
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// remove the credential from the user
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u.RemoveDeviceCredentialID(deviceCredentialID)
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_, err = databroker.Put(ctx, state.Client, u)
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if err != nil {
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return err
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}
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// remove the credential from the session
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state.Session.RemoveDeviceCredentialID(deviceCredentialID)
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return h.saveSessionAndRedirect(w, r, state, urlutil.GetAbsoluteURL(r).ResolveReference(&url.URL{
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Path: "/.pomerium",
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}).String())
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}
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func (h *Handler) handleView(w http.ResponseWriter, r *http.Request, state *State) error {
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ctx := r.Context()
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deviceTypeParam := r.FormValue(urlutil.QueryDeviceType)
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if deviceTypeParam == "" {
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return errMissingDeviceType
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}
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creationOptions, requestOptions, err := h.getOptions(ctx, state, deviceTypeParam)
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if err != nil {
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return err
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}
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m := map[string]interface{}{
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"creationOptions": creationOptions,
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"requestOptions": requestOptions,
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"selfUrl": r.URL.String(),
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}
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httputil.AddBrandingOptionsToMap(m, state.BrandingOptions)
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return ui.ServePage(w, r, "WebAuthnRegistration", m)
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}
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func (h *Handler) saveSessionAndRedirect(w http.ResponseWriter, r *http.Request, state *State, rawRedirectURI string) error {
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// save the session to the databroker
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res, err := session.Put(r.Context(), state.Client, state.Session)
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if err != nil {
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return err
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}
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// add databroker versions to the session cookie and save
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state.SessionState.DatabrokerServerVersion = res.GetServerVersion()
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state.SessionState.DatabrokerRecordVersion = res.GetRecord().GetVersion()
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err = state.SessionStore.SaveSession(w, r, state.SessionState)
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if err != nil {
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return err
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}
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// if the redirect URL is for a URL we don't control, just do a plain redirect
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if !isURLForPomerium(state.PomeriumDomains, rawRedirectURI) {
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httputil.Redirect(w, r, rawRedirectURI, http.StatusFound)
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return nil
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}
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// sign+encrypt the session JWT
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encoder, err := jws.NewHS256Signer(state.SharedKey)
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if err != nil {
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return err
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}
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signedJWT, err := encoder.Marshal(state.SessionState)
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if err != nil {
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return err
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}
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cipher, err := cryptutil.NewAEADCipher(state.SharedKey)
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if err != nil {
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return err
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}
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encryptedJWT := cryptutil.Encrypt(cipher, signedJWT, nil)
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encodedJWT := base64.URLEncoding.EncodeToString(encryptedJWT)
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// redirect to the proxy callback URL with the session
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callbackURL, err := urlutil.GetCallbackURLForRedirectURI(r, encodedJWT, rawRedirectURI)
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if err != nil {
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return err
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}
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signedCallbackURL := urlutil.NewSignedURL(state.SharedKey, callbackURL)
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httputil.Redirect(w, r, signedCallbackURL.String(), http.StatusFound)
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return nil
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}
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func getKnownDeviceCredentials(
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ctx context.Context,
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client databroker.DataBrokerServiceClient,
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deviceCredentialIDs ...string,
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) ([]*device.Credential, error) {
|
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var knownDeviceCredentials []*device.Credential
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for _, deviceCredentialID := range deviceCredentialIDs {
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deviceCredential, err := device.GetCredential(ctx, client, deviceCredentialID)
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if status.Code(err) == codes.NotFound {
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// ignore missing devices
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continue
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} else if err != nil {
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||||
return nil, httputil.NewError(http.StatusInternalServerError,
|
||||
fmt.Errorf("error retrieving device credential: %w", err))
|
||||
}
|
||||
knownDeviceCredentials = append(knownDeviceCredentials, deviceCredential)
|
||||
}
|
||||
return knownDeviceCredentials, nil
|
||||
}
|
||||
|
||||
func getOrCreateDeviceEnrollment(
|
||||
ctx context.Context,
|
||||
r *http.Request,
|
||||
state *State,
|
||||
deviceTypeID string,
|
||||
deviceCredentialID string,
|
||||
u *user.User,
|
||||
) (*device.Enrollment, error) {
|
||||
var deviceEnrollment *device.Enrollment
|
||||
|
||||
enrollmentTokenParam := r.FormValue(urlutil.QueryEnrollmentToken)
|
||||
if enrollmentTokenParam == "" {
|
||||
// create a new enrollment
|
||||
deviceEnrollment = &device.Enrollment{
|
||||
Id: uuid.New().String(),
|
||||
TypeId: deviceTypeID,
|
||||
UserId: u.GetId(),
|
||||
}
|
||||
} else {
|
||||
// use an existing enrollment
|
||||
deviceEnrollmentID, err := webauthnutil.ParseAndVerifyEnrollmentToken(state.SharedKey, enrollmentTokenParam)
|
||||
if err != nil {
|
||||
return nil, httputil.NewError(http.StatusBadRequest, fmt.Errorf("invalid enrollment token: %w", err))
|
||||
}
|
||||
|
||||
deviceEnrollment, err = device.GetEnrollment(ctx, state.Client, deviceEnrollmentID)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if deviceEnrollment.GetTypeId() != deviceTypeID {
|
||||
return nil, httputil.NewError(http.StatusForbidden, fmt.Errorf("invalid enrollment token: wrong device type"))
|
||||
}
|
||||
|
||||
if deviceEnrollment.GetUserId() != u.GetId() {
|
||||
return nil, httputil.NewError(http.StatusForbidden, fmt.Errorf("invalid enrollment token: wrong user id"))
|
||||
}
|
||||
|
||||
if deviceEnrollment.GetEnrolledAt().IsValid() {
|
||||
return nil, httputil.NewError(http.StatusForbidden, fmt.Errorf("invalid enrollment token: already used for existing credential"))
|
||||
}
|
||||
}
|
||||
|
||||
deviceEnrollment.CredentialId = deviceCredentialID
|
||||
deviceEnrollment.EnrolledAt = timestamppb.Now()
|
||||
deviceEnrollment.UserAgent = r.UserAgent()
|
||||
deviceEnrollment.IpAddress = httputil.GetClientIPAddress(r)
|
||||
|
||||
err := device.PutEnrollment(ctx, state.Client, deviceEnrollment)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return deviceEnrollment, nil
|
||||
}
|
||||
|
||||
func isURLForPomerium(pomeriumDomains []string, rawURI string) bool {
|
||||
uri, err := urlutil.ParseAndValidateURL(rawURI)
|
||||
if err != nil {
|
||||
return false
|
||||
}
|
||||
|
||||
for _, domain := range pomeriumDomains {
|
||||
if urlutil.StripPort(domain) == urlutil.StripPort(uri.Host) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
|
||||
return false
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue