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Merge pull request #562 from ericchiang/dev-add-implicit-flow-support

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dev branch: support the implicit flow
This commit is contained in:
Eric Chiang 2016-08-25 09:38:07 -07:00 committed by GitHub
commit 6564c15d9e
5 changed files with 266 additions and 44 deletions
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6
cmd/dex/config.go
View file

@ -19,10 +19,16 @@ type Config struct {
Storage Storage `yaml:"storage"`
Connectors []Connector `yaml:"connectors"`
Web Web `yaml:"web"`
OAuth2 OAuth2 `yaml:"oauth2"`
StaticClients []storage.Client `yaml:"staticClients"`
}
// OAuth2 describes enabled OAuth2 extensions.
type OAuth2 struct {
ResponseTypes []string `yaml:"responseTypes"`
}
// Web is the config format for the HTTP server.
type Web struct {
HTTP string `yaml:"http"`

68
server/handlers.go
View file

@ -102,7 +102,7 @@ func (s *Server) handleDiscovery(w http.ResponseWriter, r *http.Request) {
// handleAuthorization handles the OAuth2 auth endpoint.
func (s *Server) handleAuthorization(w http.ResponseWriter, r *http.Request) {
authReq, err := parseAuthorizationRequest(s.storage, r)
authReq, err := parseAuthorizationRequest(s.storage, s.supportedResponseTypes, r)
if err != nil {
s.renderError(w, http.StatusInternalServerError, err.Type, err.Description)
return
@ -318,35 +318,55 @@ func (s *Server) sendCodeResponse(w http.ResponseWriter, r *http.Request, authRe
}
return
}
code := storage.AuthCode{
ID: storage.NewID(),
ClientID: authReq.ClientID,
ConnectorID: authReq.ConnectorID,
Nonce: authReq.Nonce,
Scopes: authReq.Scopes,
Claims: *authReq.Claims,
Expiry: s.now().Add(time.Minute * 5),
RedirectURI: authReq.RedirectURI,
}
if err := s.storage.CreateAuthCode(code); err != nil {
log.Printf("Failed to create auth code: %v", err)
s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
if authReq.RedirectURI == "urn:ietf:wg:oauth:2.0:oob" {
// TODO(ericchiang): Add a proper template.
fmt.Fprintf(w, "Code: %s", code.ID)
return
}
u, err := url.Parse(authReq.RedirectURI)
if err != nil {
s.renderError(w, http.StatusInternalServerError, errServerError, "Invalid redirect URI.")
return
}
q := u.Query()
q.Set("code", code.ID)
for _, responseType := range authReq.ResponseTypes {
switch responseType {
case responseTypeCode:
code := storage.AuthCode{
ID: storage.NewID(),
ClientID: authReq.ClientID,
ConnectorID: authReq.ConnectorID,
Nonce: authReq.Nonce,
Scopes: authReq.Scopes,
Claims: *authReq.Claims,
Expiry: s.now().Add(time.Minute * 5),
RedirectURI: authReq.RedirectURI,
}
if err := s.storage.CreateAuthCode(code); err != nil {
log.Printf("Failed to create auth code: %v", err)
s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
if authReq.RedirectURI == redirectURIOOB {
// TODO(ericchiang): Add a proper template.
fmt.Fprintf(w, "Code: %s", code.ID)
return
}
q.Set("code", code.ID)
case responseTypeToken:
idToken, expiry, err := s.newIDToken(authReq.ClientID, *authReq.Claims, authReq.Scopes, authReq.Nonce)
if err != nil {
log.Printf("failed to create ID token: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
return
}
v := url.Values{}
v.Set("access_token", storage.NewID())
v.Set("token_type", "bearer")
v.Set("id_token", idToken)
v.Set("state", authReq.State)
v.Set("expires_in", strconv.Itoa(int(expiry.Sub(s.now()))))
u.Fragment = v.Encode()
}
}
q.Set("state", authReq.State)
u.RawQuery = q.Encode()
http.Redirect(w, r, u.String(), http.StatusSeeOther)

36
server/oauth2.go
View file

@ -77,6 +77,10 @@ const (
scopeCrossClientPrefix = "oauth2:server:client_id:"
)
const (
redirectURIOOB = "urn:ietf:wg:oauth:2.0:oob"
)
const (
grantTypeAuthorizationCode = "authorization_code"
grantTypeRefreshToken = "refresh_token"
@ -88,12 +92,6 @@ const (
responseTypeIDToken = "id_token" // ID Token in url fragment
)
var validResponseTypes = map[string]bool{
"code": true,
"token": true,
"id_token": true,
}
type audience []string
func (a audience) MarshalJSON() ([]byte, error) {
@ -182,7 +180,7 @@ func (s *Server) newIDToken(clientID string, claims storage.Claims, scopes []str
// parse the initial request from the OAuth2 client.
//
// For correctness the logic is largely copied from https://github.com/RangelReale/osin.
func parseAuthorizationRequest(s storage.Storage, r *http.Request) (req storage.AuthRequest, oauth2Err *authErr) {
func parseAuthorizationRequest(s storage.Storage, supportedResponseTypes map[string]bool, r *http.Request) (req storage.AuthRequest, oauth2Err *authErr) {
if err := r.ParseForm(); err != nil {
return req, &authErr{"", "", errInvalidRequest, "Failed to parse request."}
}
@ -252,9 +250,27 @@ func parseAuthorizationRequest(s storage.Storage, r *http.Request) (req storage.
return req, newErr("invalid_scope", "Client can't request scope(s) %q", invalidScopes)
}
nonce := r.Form.Get("nonce")
responseTypes := strings.Split(r.Form.Get("response_type"), " ")
for _, responseType := range responseTypes {
if !validResponseTypes[responseType] {
if !supportedResponseTypes[responseType] {
return req, newErr("invalid_request", "Invalid response type %q", responseType)
}
switch responseType {
case responseTypeCode:
case responseTypeToken:
// Implicit flow requires a nonce value.
// https://openid.net/specs/openid-connect-core-1_0.html#ImplicitAuthRequest
if nonce == "" {
return req, newErr("invalid_request", "Response type 'token' requires a 'nonce' value.")
}
if redirectURI == redirectURIOOB {
err := fmt.Sprintf("Cannot use response type 'token' with redirect_uri '%s'.", redirectURIOOB)
return req, newErr("invalid_request", err)
}
default:
return req, newErr("invalid_request", "Invalid response type %q", responseType)
}
}
@ -263,7 +279,7 @@ func parseAuthorizationRequest(s storage.Storage, r *http.Request) (req storage.
ID: storage.NewID(),
ClientID: client.ID,
State: r.Form.Get("state"),
Nonce: r.Form.Get("nonce"),
Nonce: nonce,
ForceApprovalPrompt: r.Form.Get("approval_prompt") == "force",
Scopes: scopes,
RedirectURI: redirectURI,
@ -308,7 +324,7 @@ func validateRedirectURI(client storage.Client, redirectURI string) bool {
return false
}
if redirectURI == "urn:ietf:wg:oauth:2.0:oob" {
if redirectURI == redirectURIOOB {
return true
}
if !strings.HasPrefix(redirectURI, "http://localhost:") {

28
server/server.go
View file

@ -23,6 +23,8 @@ type Connector struct {
}
// Config holds the server's configuration options.
//
// Multiple servers using the same storage are expected to be configured identically.
type Config struct {
Issuer string
@ -32,8 +34,10 @@ type Config struct {
// Strategies for federated identity.
Connectors []Connector
// NOTE: Multiple servers using the same storage are expected to set rotation and
// validity periods to the same values.
// Valid values are "code" to enable the code flow and "token" to enable the implicit
// flow. If no response types are supplied this value defaults to "code".
SupportedResponseTypes []string
RotateKeysAfter time.Duration // Defaults to 6 hours.
IDTokensValidFor time.Duration // Defaults to 24 hours
@ -63,6 +67,8 @@ type Server struct {
// No package level API to set this, only used in tests.
skipApproval bool
supportedResponseTypes map[string]bool
now func() time.Time
idTokensValidFor time.Duration
@ -87,6 +93,19 @@ func newServer(c Config, rotationStrategy rotationStrategy) (*Server, error) {
if c.Storage == nil {
return nil, errors.New("server: storage cannot be nil")
}
if len(c.SupportedResponseTypes) == 0 {
c.SupportedResponseTypes = []string{responseTypeCode}
}
supported := make(map[string]bool)
for _, respType := range c.SupportedResponseTypes {
switch respType {
case responseTypeCode, responseTypeToken:
default:
return nil, fmt.Errorf("unsupported response_type %q", respType)
}
supported[respType] = true
}
now := c.Now
if now == nil {
@ -102,8 +121,9 @@ func newServer(c Config, rotationStrategy rotationStrategy) (*Server, error) {
),
now,
),
idTokensValidFor: value(c.IDTokensValidFor, 24*time.Hour),
now: now,
supportedResponseTypes: supported,
idTokensValidFor: value(c.IDTokensValidFor, 24*time.Hour),
now: now,
}
for _, conn := range c.Connectors {

172
server/server_test.go
View file

@ -4,9 +4,14 @@ import (
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"net/http"
"net/http/httptest"
"net/http/httputil"
"net/url"
"strings"
"sync"
"testing"
"time"
@ -59,12 +64,11 @@ FDWV28nTP9sqbtsmU8Tem2jzMvZ7C/Q0AuDoKELFUpux8shm8wfIhyaPnXUGZoAZ
Np4vUwMSYV5mopESLWOg3loBxKyLGFtgGKVCjGiQvy6zISQ4fQo=
-----END RSA PRIVATE KEY-----`)
func newTestServer(path string) (*httptest.Server, *Server) {
func newTestServer(updateConfig func(c *Config)) (*httptest.Server, *Server) {
var server *Server
s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
server.ServeHTTP(w, r)
}))
s.URL = s.URL + path
config := Config{
Issuer: s.URL,
Storage: memory.New(),
@ -76,6 +80,11 @@ func newTestServer(path string) (*httptest.Server, *Server) {
},
},
}
if updateConfig != nil {
updateConfig(&config)
}
s.URL = config.Issuer
var err error
if server, err = newServer(config, staticRotationStrategy(testKey)); err != nil {
panic(err)
@ -85,14 +94,16 @@ func newTestServer(path string) (*httptest.Server, *Server) {
}
func TestNewTestServer(t *testing.T) {
newTestServer("")
newTestServer(nil)
}
func TestDiscovery(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
httpServer, _ := newTestServer("/nonrootpath")
httpServer, _ := newTestServer(func(c *Config) {
c.Issuer = c.Issuer + "/non-root-path"
})
defer httpServer.Close()
p, err := oidc.NewProvider(ctx, httpServer.URL)
@ -114,11 +125,13 @@ func TestDiscovery(t *testing.T) {
}
}
func TestOAuth2Flow(t *testing.T) {
func TestOAuth2CodeFlow(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
httpServer, s := newTestServer("/nonrootpath")
httpServer, s := newTestServer(func(c *Config) {
c.Issuer = c.Issuer + "/non-root-path"
})
defer httpServer.Close()
p, err := oidc.NewProvider(ctx, httpServer.URL)
@ -221,6 +234,153 @@ func TestOAuth2Flow(t *testing.T) {
}
}
type nonceSource struct {
nonce string
once sync.Once
}
func (n *nonceSource) ClaimNonce(nonce string) error {
if n.nonce != nonce {
return errors.New("invalid nonce")
}
ok := false
n.once.Do(func() { ok = true })
if !ok {
return errors.New("invalid nonce")
}
return nil
}
func TestOAuth2ImplicitFlow(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
httpServer, s := newTestServer(func(c *Config) {
// Enable support for the implicit flow.
c.SupportedResponseTypes = []string{"code", "token"}
})
defer httpServer.Close()
p, err := oidc.NewProvider(ctx, httpServer.URL)
if err != nil {
t.Fatalf("failed to get provider: %v", err)
}
var (
reqDump, respDump []byte
gotIDToken bool
state = "a_state"
nonce = "a_nonce"
)
defer func() {
if !gotIDToken {
t.Errorf("never got a id token in fragment\n%s\n%s", reqDump, respDump)
}
}()
var oauth2Config *oauth2.Config
oauth2Server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/callback" {
q := r.URL.Query()
if errType := q.Get("error"); errType != "" {
if desc := q.Get("error_description"); desc != "" {
t.Errorf("got error from server %s: %s", errType, desc)
} else {
t.Errorf("got error from server %s", errType)
}
w.WriteHeader(http.StatusInternalServerError)
return
}
// Fragment is checked by the client since net/http servers don't preserve URL fragments.
// E.g.
//
// r.URL.Fragment
//
// Will always be empty.
w.WriteHeader(http.StatusOK)
return
}
u := oauth2Config.AuthCodeURL(state, oauth2.SetAuthURLParam("response_type", "token"), oidc.Nonce(nonce))
http.Redirect(w, r, u, http.StatusSeeOther)
}))
defer oauth2Server.Close()
redirectURL := oauth2Server.URL + "/callback"
client := storage.Client{
ID: "testclient",
Secret: "testclientsecret",
RedirectURIs: []string{redirectURL},
}
if err := s.storage.CreateClient(client); err != nil {
t.Fatalf("failed to create client: %v", err)
}
src := &nonceSource{nonce: nonce}
idTokenVerifier := p.NewVerifier(ctx, oidc.VerifyAudience(client.ID), oidc.VerifyNonce(src))
oauth2Config = &oauth2.Config{
ClientID: client.ID,
ClientSecret: client.Secret,
Endpoint: p.Endpoint(),
Scopes: []string{oidc.ScopeOpenID, "profile", "email", "offline_access"},
RedirectURL: redirectURL,
}
checkIDToken := func(u *url.URL) error {
if u.Fragment == "" {
return fmt.Errorf("url has no fragment: %s", u)
}
v, err := url.ParseQuery(u.Fragment)
if err != nil {
return fmt.Errorf("failed to parse fragment: %v", err)
}
idToken := v.Get("id_token")
if idToken == "" {
return errors.New("no id_token in fragment")
}
if _, err := idTokenVerifier.Verify(idToken); err != nil {
return fmt.Errorf("failed to verify id_token: %v", err)
}
return nil
}
httpClient := &http.Client{
// net/http servers don't preserve URL fragments when passing the request to
// handlers. The only way to get at that values is to check the redirect on
// the client side.
CheckRedirect: func(req *http.Request, via []*http.Request) error {
if len(via) > 10 {
return errors.New("too many redirects")
}
// If we're being redirected back to the client server, inspect the URL fragment
// for an ID Token.
u := req.URL.String()
if strings.HasPrefix(u, oauth2Server.URL) {
if err := checkIDToken(req.URL); err == nil {
gotIDToken = true
} else {
t.Error(err)
}
}
return nil
},
}
resp, err := httpClient.Get(oauth2Server.URL + "/login")
if err != nil {
t.Fatalf("get failed: %v", err)
}
if reqDump, err = httputil.DumpRequest(resp.Request, false); err != nil {
t.Fatal(err)
}
if respDump, err = httputil.DumpResponse(resp, true); err != nil {
t.Fatal(err)
}
}
type storageWithKeysTrigger struct {
storage.Storage
f func()