Bug 1679272 - Validate console can talk to OAuth token URL

Make sure we can successfully talk to the OAuth token URL after
discovering metadata before marking the console pod as ready.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1679272

Author: spadgett

auth/auth.go

@@ -93,9 +93,9 @@ type Config struct {
 	ClientSecret string
 	Scope        []string
 
-	// DiscoveryCA is required for OpenShift OAuth metadata discovery. This is the CA
+	// K8sCA is required for OpenShift OAuth metadata discovery. This is the CA
 	// used to talk to the master, which might be different than the issuer CA.
-	DiscoveryCA string
+	K8sCA string
 
 	SuccessURL  string
 	ErrorURL    string
@@ -140,33 +140,37 @@ func newHTTPClient(issuerCA string, includeSystemRoots bool) (*http.Client, erro
 // NewAuthenticator initializes an Authenticator struct. It blocks until the authenticator is
 // able to contact the provider.
 func NewAuthenticator(ctx context.Context, c *Config) (*Authenticator, error) {
-	a, err := newUnstartedAuthenticator(c)
-	if err != nil {
-		return nil, err
-	}
-
 	// Retry connecting to the identity provider a few times
 	backoff := time.Second * 2
-	maxSteps := 5
+	maxSteps := 7
 	steps := 0
 
 	for {
 		var (
+			a        *Authenticator
 			lm       loginMethod
 			endpoint oauth2.Endpoint
 			err      error
 		)
+
+		a, err = newUnstartedAuthenticator(c)
+		if err != nil {
+			return nil, err
+		}
+
 		switch c.AuthSource {
 		case AuthSourceOpenShift:
 			// Use the k8s CA for OAuth metadata discovery.
-			var client *http.Client
-			client, err = newHTTPClient(c.DiscoveryCA, false)
+			var k8sClient *http.Client
+			// Don't include system roots when talking to the API server.
+			k8sClient, err = newHTTPClient(c.K8sCA, false)
 			if err != nil {
 				return nil, err
 			}
 
 			endpoint, lm, err = newOpenShiftAuth(ctx, &openShiftConfig{
-				client:        client,
+				k8sClient:     k8sClient,
+				oauthClient:   a.client,
 				issuerURL:     c.IssuerURL,
 				cookiePath:    c.CookiePath,
 				secureCookies: c.SecureCookies,

auth/auth_openshift.go

@@ -23,7 +23,8 @@ type openShiftAuth struct {
 }
 
 type openShiftConfig struct {
-	client        *http.Client
+	k8sClient     *http.Client
+	oauthClient   *http.Client
 	issuerURL     string
 	cookiePath    string
 	secureCookies bool
@@ -52,7 +53,7 @@ func newOpenShiftAuth(ctx context.Context, c *openShiftConfig) (oauth2.Endpoint,
 		return oauth2.Endpoint{}, nil, err
 	}
 
-	resp, err := c.client.Do(req.WithContext(ctx))
+	resp, err := c.k8sClient.Do(req.WithContext(ctx))
 	if err != nil {
 		return oauth2.Endpoint{}, nil, err
 	}
@@ -86,6 +87,19 @@ func newOpenShiftAuth(ctx context.Context, c *openShiftConfig) (oauth2.Endpoint,
 		return oauth2.Endpoint{}, nil, err
 	}
 
+	// Make sure we can talk to the token endpoint.
+	req, err = http.NewRequest(http.MethodHead, metadata.Token, nil)
+	if err != nil {
+		return oauth2.Endpoint{}, nil, err
+	}
+
+	resp, err = c.oauthClient.Do(req.WithContext(ctx))
+	if err != nil {
+		return oauth2.Endpoint{}, nil, fmt.Errorf("request to OAuth token endpoint %s failed: %v",
+			metadata.Token, err)
+	}
+	defer resp.Body.Close()
+
 	kubeAdminLogoutURL := proxy.SingleJoiningSlash(metadata.Issuer, "/logout")
 	return oauth2.Endpoint{
 		AuthURL:  metadata.Auth,

cmd/bridge/main.go

@@ -366,7 +366,7 @@ func main() {
 
 			// Use the k8s CA file for OpenShift OAuth metadata discovery.
 			// This might be different than IssuerCA.
-			DiscoveryCA: caCertFilePath,
+			K8sCA: caCertFilePath,
 
 			ErrorURL:   authLoginErrorEndpoint,
 			SuccessURL: authLoginSuccessEndpoint,