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dex/server/handlers.go

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package server
import (
"encoding/json"
"errors"
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"fmt"
"log"
"net/http"
"net/url"
"path"
"sort"
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"strconv"
"strings"
"time"
"github.com/gorilla/mux"
jose "gopkg.in/square/go-jose.v2"
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"github.com/coreos/dex/connector"
"github.com/coreos/dex/storage"
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)
func (s *Server) handlePublicKeys(w http.ResponseWriter, r *http.Request) {
// TODO(ericchiang): Cache this.
keys, err := s.storage.GetKeys()
if err != nil {
log.Printf("failed to get keys: %v", err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
if keys.SigningKeyPub == nil {
log.Printf("No public keys found.")
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
jwks := jose.JSONWebKeySet{
Keys: make([]jose.JSONWebKey, len(keys.VerificationKeys)+1),
}
jwks.Keys[0] = *keys.SigningKeyPub
for i, verificationKey := range keys.VerificationKeys {
jwks.Keys[i+1] = *verificationKey.PublicKey
}
data, err := json.MarshalIndent(jwks, "", " ")
if err != nil {
log.Printf("failed to marshal discovery data: %v", err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
maxAge := keys.NextRotation.Sub(s.now())
if maxAge < (time.Minute * 2) {
maxAge = time.Minute * 2
}
w.Header().Set("Cache-Control", fmt.Sprintf("max-age=%d, must-revalidate", maxAge))
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Content-Length", strconv.Itoa(len(data)))
w.Write(data)
}
type discovery struct {
Issuer string `json:"issuer"`
Auth string `json:"authorization_endpoint"`
Token string `json:"token_endpoint"`
Keys string `json:"jwks_uri"`
ResponseTypes []string `json:"response_types_supported"`
Subjects []string `json:"subject_types_supported"`
IDTokenAlgs []string `json:"id_token_signing_alg_values_supported"`
Scopes []string `json:"scopes_supported"`
AuthMethods []string `json:"token_endpoint_auth_methods_supported"`
Claims []string `json:"claims_supported"`
}
func (s *Server) discoveryHandler() (http.HandlerFunc, error) {
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d := discovery{
Issuer: s.issuerURL.String(),
Auth: s.absURL("/auth"),
Token: s.absURL("/token"),
Keys: s.absURL("/keys"),
Subjects: []string{"public"},
IDTokenAlgs: []string{string(jose.RS256)},
Scopes: []string{"openid", "email", "profile", "offline_access"},
AuthMethods: []string{"client_secret_basic"},
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Claims: []string{
"aud", "email", "email_verified", "exp",
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"iat", "iss", "locale", "name", "sub",
},
}
for responseType := range s.supportedResponseTypes {
d.ResponseTypes = append(d.ResponseTypes, responseType)
}
sort.Strings(d.ResponseTypes)
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data, err := json.MarshalIndent(d, "", " ")
if err != nil {
return nil, fmt.Errorf("failed to marshal discovery data: %v", err)
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}
return func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Content-Length", strconv.Itoa(len(data)))
w.Write(data)
}, nil
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}
// handleAuthorization handles the OAuth2 auth endpoint.
func (s *Server) handleAuthorization(w http.ResponseWriter, r *http.Request) {
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authReq, err := parseAuthorizationRequest(s.storage, s.supportedResponseTypes, r)
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if err != nil {
s.renderError(w, http.StatusInternalServerError, err.Type, err.Description)
return
}
if err := s.storage.CreateAuthRequest(authReq); err != nil {
log.Printf("Failed to create authorization request: %v", err)
s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
state := authReq.ID
if len(s.connectors) == 1 {
for id := range s.connectors {
http.Redirect(w, r, s.absPath("/auth", id)+"?state="+state, http.StatusFound)
return
}
}
connectorInfos := make([]connectorInfo, len(s.connectors))
i := 0
for id := range s.connectors {
connectorInfos[i] = connectorInfo{
DisplayName: id,
URL: s.absPath("/auth", id),
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}
i++
}
renderLoginOptions(w, connectorInfos, state)
}
func (s *Server) handleConnectorLogin(w http.ResponseWriter, r *http.Request) {
connID := mux.Vars(r)["connector"]
conn, ok := s.connectors[connID]
if !ok {
s.notFound(w, r)
return
}
// TODO(ericchiang): cache user identity.
state := r.FormValue("state")
switch r.Method {
case "GET":
switch conn := conn.Connector.(type) {
case connector.CallbackConnector:
callbackURL, err := conn.LoginURL(s.absURL("/callback", connID), state)
if err != nil {
log.Printf("Connector %q returned error when creating callback: %v", connID, err)
s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
http.Redirect(w, r, callbackURL, http.StatusFound)
case connector.PasswordConnector:
renderPasswordTmpl(w, state, r.URL.String(), "")
default:
s.notFound(w, r)
}
case "POST":
passwordConnector, ok := conn.Connector.(connector.PasswordConnector)
if !ok {
s.notFound(w, r)
return
}
username := r.FormValue("username")
password := r.FormValue("password")
identity, ok, err := passwordConnector.Login(username, password)
if err != nil {
log.Printf("Failed to login user: %v", err)
s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
if !ok {
renderPasswordTmpl(w, state, r.URL.String(), "Invalid credentials")
return
}
redirectURL, err := s.finalizeLogin(identity, state, connID, conn.Connector)
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if err != nil {
log.Printf("Failed to finalize login: %v", err)
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s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
http.Redirect(w, r, redirectURL, http.StatusSeeOther)
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default:
s.notFound(w, r)
}
}
func (s *Server) handleConnectorCallback(w http.ResponseWriter, r *http.Request) {
connID := mux.Vars(r)["connector"]
conn, ok := s.connectors[connID]
if !ok {
s.notFound(w, r)
return
}
callbackConnector, ok := conn.Connector.(connector.CallbackConnector)
if !ok {
s.notFound(w, r)
return
}
identity, state, err := callbackConnector.HandleCallback(r)
if err != nil {
log.Printf("Failed to authenticate: %v", err)
s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
redirectURL, err := s.finalizeLogin(identity, state, connID, conn.Connector)
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if err != nil {
log.Printf("Failed to finalize login: %v", err)
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s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
http.Redirect(w, r, redirectURL, http.StatusSeeOther)
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}
func (s *Server) finalizeLogin(identity connector.Identity, authReqID, connectorID string, conn connector.Connector) (string, error) {
if authReqID == "" {
return "", errors.New("no auth request ID passed")
}
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claims := storage.Claims{
UserID: identity.UserID,
Username: identity.Username,
Email: identity.Email,
EmailVerified: identity.EmailVerified,
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}
groupsConn, ok := conn.(connector.GroupsConnector)
if ok {
authReq, err := s.storage.GetAuthRequest(authReqID)
if err != nil {
return "", fmt.Errorf("get auth request: %v", err)
}
reqGroups := func() bool {
for _, scope := range authReq.Scopes {
if scope == scopeGroups {
return true
}
}
return false
}()
if reqGroups {
if claims.Groups, err = groupsConn.Groups(identity); err != nil {
return "", fmt.Errorf("getting groups: %v", err)
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}
}
}
updater := func(a storage.AuthRequest) (storage.AuthRequest, error) {
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a.Claims = &claims
a.ConnectorID = connectorID
a.ConnectorData = identity.ConnectorData
return a, nil
}
if err := s.storage.UpdateAuthRequest(authReqID, updater); err != nil {
return "", fmt.Errorf("failed to update auth request: %v", err)
}
return path.Join(s.issuerURL.Path, "/approval") + "?state=" + authReqID, nil
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}
func (s *Server) handleApproval(w http.ResponseWriter, r *http.Request) {
authReq, err := s.storage.GetAuthRequest(r.FormValue("state"))
if err != nil {
log.Printf("Failed to get auth request: %v", err)
s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
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if authReq.Claims == nil {
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log.Printf("Auth request does not have an identity for approval")
s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
switch r.Method {
case "GET":
if s.skipApproval {
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s.sendCodeResponse(w, r, authReq)
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return
}
client, err := s.storage.GetClient(authReq.ClientID)
if err != nil {
log.Printf("Failed to get client %q: %v", authReq.ClientID, err)
s.renderError(w, http.StatusInternalServerError, errServerError, "")
return
}
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renderApprovalTmpl(w, authReq.ID, *authReq.Claims, client, authReq.Scopes)
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case "POST":
if r.FormValue("approval") != "approve" {
s.renderError(w, http.StatusInternalServerError, "approval rejected", "")
return
}
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s.sendCodeResponse(w, r, authReq)
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}
}
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func (s *Server) sendCodeResponse(w http.ResponseWriter, r *http.Request, authReq storage.AuthRequest) {
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if authReq.Expiry.After(s.now()) {
s.renderError(w, http.StatusBadRequest, errInvalidRequest, "Authorization request period has expired.")
return
}
if err := s.storage.DeleteAuthRequest(authReq.ID); err != nil {
if err != storage.ErrNotFound {
log.Printf("Failed to delete authorization request: %v", err)
s.renderError(w, http.StatusInternalServerError, errServerError, "")
} else {
s.renderError(w, http.StatusBadRequest, errInvalidRequest, "Authorization request has already been completed.")
}
return
}
u, err := url.Parse(authReq.RedirectURI)
if err != nil {
s.renderError(w, http.StatusInternalServerError, errServerError, "Invalid redirect URI.")
return
}
q := u.Query()
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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()
}
}
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q.Set("state", authReq.State)
u.RawQuery = q.Encode()
http.Redirect(w, r, u.String(), http.StatusSeeOther)
}
func (s *Server) handleToken(w http.ResponseWriter, r *http.Request) {
clientID, clientSecret, ok := r.BasicAuth()
if ok {
var err error
if clientID, err = url.QueryUnescape(clientID); err != nil {
tokenErr(w, errInvalidRequest, "client_id improperly encoded", http.StatusBadRequest)
return
}
if clientSecret, err = url.QueryUnescape(clientSecret); err != nil {
tokenErr(w, errInvalidRequest, "client_secret improperly encoded", http.StatusBadRequest)
return
}
} else {
clientID = r.PostFormValue("client_id")
clientSecret = r.PostFormValue("client_secret")
}
client, err := s.storage.GetClient(clientID)
if err != nil {
if err != storage.ErrNotFound {
log.Printf("failed to get client: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
} else {
tokenErr(w, errInvalidClient, "Invalid client credentials.", http.StatusUnauthorized)
}
return
}
if client.Secret != clientSecret {
tokenErr(w, errInvalidClient, "Invalid client credentials.", http.StatusUnauthorized)
return
}
grantType := r.PostFormValue("grant_type")
switch grantType {
case grantTypeAuthorizationCode:
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s.handleAuthCode(w, r, client)
case grantTypeRefreshToken:
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s.handleRefreshToken(w, r, client)
default:
tokenErr(w, errInvalidGrant, "", http.StatusBadRequest)
}
}
// handle an access token request https://tools.ietf.org/html/rfc6749#section-4.1.3
func (s *Server) handleAuthCode(w http.ResponseWriter, r *http.Request, client storage.Client) {
code := r.PostFormValue("code")
redirectURI := r.PostFormValue("redirect_uri")
authCode, err := s.storage.GetAuthCode(code)
if err != nil || s.now().After(authCode.Expiry) || authCode.ClientID != client.ID {
if err != storage.ErrNotFound {
log.Printf("failed to get auth code: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
} else {
tokenErr(w, errInvalidRequest, "Invalid or expired code parameter.", http.StatusBadRequest)
}
return
}
if authCode.RedirectURI != redirectURI {
tokenErr(w, errInvalidRequest, "redirect_uri did not match URI from initial request.", http.StatusBadRequest)
return
}
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idToken, expiry, err := s.newIDToken(client.ID, authCode.Claims, authCode.Scopes, authCode.Nonce)
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if err != nil {
log.Printf("failed to create ID token: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
return
}
if err := s.storage.DeleteAuthCode(code); err != nil {
log.Printf("failed to delete auth code: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
return
}
reqRefresh := func() bool {
for _, scope := range authCode.Scopes {
if scope == scopeOfflineAccess {
return true
}
}
return false
}()
var refreshToken string
if reqRefresh {
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refresh := storage.RefreshToken{
RefreshToken: storage.NewID(),
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ClientID: authCode.ClientID,
ConnectorID: authCode.ConnectorID,
Scopes: authCode.Scopes,
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Claims: authCode.Claims,
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Nonce: authCode.Nonce,
}
if err := s.storage.CreateRefresh(refresh); err != nil {
log.Printf("failed to create refresh token: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
return
}
refreshToken = refresh.RefreshToken
}
s.writeAccessToken(w, idToken, refreshToken, expiry)
}
// handle a refresh token request https://tools.ietf.org/html/rfc6749#section-6
func (s *Server) handleRefreshToken(w http.ResponseWriter, r *http.Request, client storage.Client) {
code := r.PostFormValue("refresh_token")
scope := r.PostFormValue("scope")
if code == "" {
tokenErr(w, errInvalidRequest, "No refresh token in request.", http.StatusBadRequest)
return
}
refresh, err := s.storage.GetRefresh(code)
if err != nil || refresh.ClientID != client.ID {
if err != storage.ErrNotFound {
log.Printf("failed to get auth code: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
} else {
tokenErr(w, errInvalidRequest, "Refresh token is invalid or has already been claimed by another client.", http.StatusBadRequest)
}
return
}
scopes := refresh.Scopes
if scope != "" {
requestedScopes := strings.Split(scope, " ")
contains := func() bool {
Loop:
for _, s := range requestedScopes {
for _, scope := range refresh.Scopes {
if s == scope {
continue Loop
}
}
return false
}
return true
}()
if !contains {
tokenErr(w, errInvalidRequest, "Requested scopes did not contain authorized scopes.", http.StatusBadRequest)
return
}
scopes = requestedScopes
}
// TODO(ericchiang): re-auth with backends
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idToken, expiry, err := s.newIDToken(client.ID, refresh.Claims, scopes, refresh.Nonce)
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if err != nil {
log.Printf("failed to create ID token: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
return
}
if err := s.storage.DeleteRefresh(code); err != nil {
log.Printf("failed to delete auth code: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
return
}
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refresh.RefreshToken = storage.NewID()
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if err := s.storage.CreateRefresh(refresh); err != nil {
log.Printf("failed to create refresh token: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
return
}
s.writeAccessToken(w, idToken, refresh.RefreshToken, expiry)
}
func (s *Server) writeAccessToken(w http.ResponseWriter, idToken, refreshToken string, expiry time.Time) {
// TODO(ericchiang): figure out an access token story and support the user info
// endpoint. For now use a random value so no one depends on the access_token
// holding a specific structure.
resp := struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
ExpiresIn int `json:"expires_in"`
RefreshToken string `json:"refresh_token,omitempty"`
IDToken string `json:"id_token"`
}{
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storage.NewID(),
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"bearer",
int(expiry.Sub(s.now())),
refreshToken,
idToken,
}
data, err := json.Marshal(resp)
if err != nil {
log.Printf("failed to marshal access token response: %v", err)
tokenErr(w, errServerError, "", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Content-Length", strconv.Itoa(len(data)))
w.Write(data)
}
func (s *Server) renderError(w http.ResponseWriter, status int, err, description string) {
http.Error(w, fmt.Sprintf("%s: %s", err, description), status)
}
func (s *Server) notFound(w http.ResponseWriter, r *http.Request) {
http.NotFound(w, r)
}