Add generic oauth connector
Co-authored-by: Shash Reddy <sreddy@pivotal.io> Signed-off-by: Joshua Winters <jwinters@pivotal.io>
This commit is contained in:
Joshua Winters
Rui Yang
242
connector/oauth/oauth.go
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242
connector/oauth/oauth.go
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@@ -0,0 +1,242 @@
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package oauth
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import (
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"context"
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"crypto/tls"
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"crypto/x509"
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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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"io/ioutil"
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"net"
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"net/http"
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"strings"
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"time"
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"github.com/dexidp/dex/connector"
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"github.com/dexidp/dex/pkg/log"
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"golang.org/x/oauth2"
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)
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type oauthConnector struct {
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clientID string
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clientSecret string
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redirectURI string
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tokenURL string
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authorizationURL string
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userInfoURL string
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scopes []string
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groupsKey string
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httpClient *http.Client
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logger log.Logger
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}
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type connectorData struct {
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AccessToken string
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}
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type Config struct {
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ClientID string `json:"clientID"`
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ClientSecret string `json:"clientSecret"`
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RedirectURI string `json:"redirectURI"`
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TokenURL string `json:"tokenURL"`
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AuthorizationURL string `json:"authorizationURL"`
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UserInfoURL string `json:"userInfoURL"`
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Scopes []string `json:"scopes"`
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GroupsKey string `json:"groupsKey"`
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RootCAs []string `json:"rootCAs"`
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InsecureSkipVerify bool `json:"insecureSkipVerify"`
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}
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func (c *Config) Open(id string, logger log.Logger) (connector.Connector, error) {
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var err error
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oauthConn := &oauthConnector{
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clientID: c.ClientID,
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clientSecret: c.ClientSecret,
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tokenURL: c.TokenURL,
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authorizationURL: c.AuthorizationURL,
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userInfoURL: c.UserInfoURL,
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scopes: c.Scopes,
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groupsKey: c.GroupsKey,
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redirectURI: c.RedirectURI,
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logger: logger,
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}
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oauthConn.httpClient, err = newHTTPClient(c.RootCAs, c.InsecureSkipVerify)
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if err != nil {
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return nil, err
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}
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return oauthConn, err
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}
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func newHTTPClient(rootCAs []string, insecureSkipVerify bool) (*http.Client, error) {
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pool, err := x509.SystemCertPool()
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if err != nil {
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return nil, err
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}
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tlsConfig := tls.Config{RootCAs: pool, InsecureSkipVerify: insecureSkipVerify}
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for _, rootCA := range rootCAs {
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rootCABytes, err := ioutil.ReadFile(rootCA)
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if err != nil {
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return nil, fmt.Errorf("failed to read root-ca: %v", err)
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}
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if !tlsConfig.RootCAs.AppendCertsFromPEM(rootCABytes) {
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return nil, fmt.Errorf("no certs found in root CA file %q", rootCA)
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}
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}
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return &http.Client{
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Transport: &http.Transport{
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TLSClientConfig: &tlsConfig,
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Proxy: http.ProxyFromEnvironment,
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DialContext: (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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DualStack: true,
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}).DialContext,
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MaxIdleConns: 100,
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IdleConnTimeout: 90 * time.Second,
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TLSHandshakeTimeout: 10 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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},
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}, nil
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}
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func (c *oauthConnector) LoginURL(scopes connector.Scopes, callbackURL, state string) (string, error) {
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if c.redirectURI != callbackURL {
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return "", fmt.Errorf("expected callback URL %q did not match the URL in the config %q", callbackURL, c.redirectURI)
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}
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oauth2Config := &oauth2.Config{
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ClientID: c.clientID,
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ClientSecret: c.clientSecret,
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Endpoint: oauth2.Endpoint{TokenURL: c.tokenURL, AuthURL: c.authorizationURL},
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RedirectURL: c.redirectURI,
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Scopes: c.scopes,
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}
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return oauth2Config.AuthCodeURL(state), nil
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}
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func (c *oauthConnector) HandleCallback(s connector.Scopes, r *http.Request) (identity connector.Identity, err error) {
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q := r.URL.Query()
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if errType := q.Get("error"); errType != "" {
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return identity, errors.New(q.Get("error_description"))
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}
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oauth2Config := &oauth2.Config{
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ClientID: c.clientID,
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ClientSecret: c.clientSecret,
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Endpoint: oauth2.Endpoint{TokenURL: c.tokenURL, AuthURL: c.authorizationURL},
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RedirectURL: c.redirectURI,
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Scopes: c.scopes,
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}
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ctx := context.WithValue(r.Context(), oauth2.HTTPClient, c.httpClient)
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token, err := oauth2Config.Exchange(ctx, q.Get("code"))
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if err != nil {
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return identity, fmt.Errorf("OAuth connector: failed to get token: %v", err)
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}
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client := oauth2.NewClient(ctx, oauth2.StaticTokenSource(token))
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userInfoResp, err := client.Get(c.userInfoURL)
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if err != nil {
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return identity, fmt.Errorf("OAuth Connector: failed to execute request to userinfo: %v", err)
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}
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if userInfoResp.StatusCode != http.StatusOK {
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return identity, fmt.Errorf("OAuth Connector: failed to execute request to userinfo: status %d", userInfoResp.StatusCode)
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}
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defer userInfoResp.Body.Close()
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var userInfoResult map[string]interface{}
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err = json.NewDecoder(userInfoResp.Body).Decode(&userInfoResult)
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if err != nil {
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return identity, fmt.Errorf("OAuth Connector: failed to parse userinfo: %v", err)
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}
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identity.UserID, _ = userInfoResult["user_id"].(string)
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identity.Name, _ = userInfoResult["name"].(string)
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identity.Username, _ = userInfoResult["user_name"].(string)
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identity.Email, _ = userInfoResult["email"].(string)
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identity.EmailVerified, _ = userInfoResult["email_verified"].(bool)
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if s.Groups {
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if c.groupsKey == "" {
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c.groupsKey = "groups"
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}
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groups := map[string]bool{}
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c.addGroupsFromMap(groups, userInfoResult)
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c.addGroupsFromToken(groups, token.AccessToken)
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for groupName, _ := range groups {
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identity.Groups = append(identity.Groups, groupName)
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}
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}
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if s.OfflineAccess {
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data := connectorData{AccessToken: token.AccessToken}
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connData, err := json.Marshal(data)
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if err != nil {
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return identity, fmt.Errorf("OAuth Connector: failed to parse connector data for offline access: %v", err)
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}
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identity.ConnectorData = connData
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}
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return identity, nil
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}
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func (c *oauthConnector) addGroupsFromMap(groups map[string]bool, result map[string]interface{}) error {
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groupsClaim, ok := result[c.groupsKey].([]interface{})
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if !ok {
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return errors.New("Cant convert to array")
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}
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for _, group := range groupsClaim {
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if groupString, ok := group.(string); ok {
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groups[groupString] = true
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}
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}
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return nil
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}
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func (c *oauthConnector) addGroupsFromToken(groups map[string]bool, token string) error {
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parts := strings.Split(token, ".")
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if len(parts) < 2 {
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return errors.New("Invalid token")
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}
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decoded, err := decode(parts[1])
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if err != nil {
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return err
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}
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var claimsMap map[string]interface{}
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err = json.Unmarshal(decoded, &claimsMap)
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if err != nil {
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return err
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}
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return c.addGroupsFromMap(groups, claimsMap)
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}
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func decode(seg string) ([]byte, error) {
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if l := len(seg) % 4; l > 0 {
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seg += strings.Repeat("=", 4-l)
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}
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return base64.URLEncoding.DecodeString(seg)
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}
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