OP#792 initial commit after fork

internal/config/identity/openid/providercfg.go

@@ -0,0 +1,161 @@
+// Copyright (c) 2015-2022 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package openid
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"github.com/minio/minio/internal/arn"
+	"github.com/minio/minio/internal/config"
+	"github.com/minio/minio/internal/config/identity/openid/provider"
+	xhttp "github.com/minio/minio/internal/http"
+	xnet "github.com/minio/pkg/v3/net"
+)
+
+type providerCfg struct {
+	// Used for user interface like console
+	DisplayName string
+
+	JWKS struct {
+		URL *xnet.URL
+	}
+	URL                *xnet.URL
+	ClaimPrefix        string
+	ClaimName          string
+	ClaimUserinfo      bool
+	RedirectURI        string
+	RedirectURIDynamic bool
+	DiscoveryDoc       DiscoveryDoc
+	ClientID           string
+	ClientSecret       string
+	RolePolicy         string
+	UserReadableClaim  string
+	UserIDClaim        string
+
+	roleArn  arn.ARN
+	provider provider.Provider
+}
+
+func newProviderCfgFromConfig(getCfgVal func(cfgName string) string) providerCfg {
+	return providerCfg{
+		DisplayName:        getCfgVal(DisplayName),
+		ClaimName:          getCfgVal(ClaimName),
+		ClaimUserinfo:      getCfgVal(ClaimUserinfo) == config.EnableOn,
+		ClaimPrefix:        getCfgVal(ClaimPrefix),
+		RedirectURI:        getCfgVal(RedirectURI),
+		RedirectURIDynamic: getCfgVal(RedirectURIDynamic) == config.EnableOn,
+		ClientID:           getCfgVal(ClientID),
+		ClientSecret:       getCfgVal(ClientSecret),
+		RolePolicy:         getCfgVal(RolePolicy),
+		UserReadableClaim:  getCfgVal(UserReadableClaim),
+		UserIDClaim:        getCfgVal(UserIDClaim),
+	}
+}
+
+const (
+	keyCloakVendor = "keycloak"
+)
+
+// initializeProvider initializes if any additional vendor specific information
+// was provided, initialization will return an error initial login fails.
+func (p *providerCfg) initializeProvider(cfgGet func(string) string, transport http.RoundTripper) error {
+	vendor := cfgGet(Vendor)
+	if vendor == "" {
+		return nil
+	}
+	var err error
+	switch vendor {
+	case keyCloakVendor:
+		adminURL := cfgGet(KeyCloakAdminURL)
+		realm := cfgGet(KeyCloakRealm)
+		p.provider, err = provider.KeyCloak(
+			provider.WithAdminURL(adminURL),
+			provider.WithOpenIDConfig(provider.DiscoveryDoc(p.DiscoveryDoc)),
+			provider.WithTransport(transport),
+			provider.WithRealm(realm),
+		)
+		return err
+	default:
+		return fmt.Errorf("Unsupported vendor %s", keyCloakVendor)
+	}
+}
+
+// GetRoleArn returns the role ARN.
+func (p *providerCfg) GetRoleArn() string {
+	if p.RolePolicy == "" {
+		return ""
+	}
+	return p.roleArn.String()
+}
+
+// UserInfo returns claims for authenticated user from userInfo endpoint.
+//
+// Some OIDC implementations such as GitLab do not support
+// claims as part of the normal oauth2 flow, instead rely
+// on service providers making calls to IDP to fetch additional
+// claims available from the UserInfo endpoint
+func (p *providerCfg) UserInfo(ctx context.Context, accessToken string, transport http.RoundTripper) (map[string]any, error) {
+	if p.JWKS.URL == nil || p.JWKS.URL.String() == "" {
+		return nil, errors.New("openid not configured")
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, p.DiscoveryDoc.UserInfoEndpoint, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	if accessToken != "" {
+		req.Header.Set("Authorization", "Bearer "+accessToken)
+	}
+
+	client := &http.Client{
+		Transport: transport,
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	defer xhttp.DrainBody(resp.Body)
+	if resp.StatusCode != http.StatusOK {
+		// uncomment this for debugging when needed.
+		// reqBytes, _ := httputil.DumpRequest(req, false)
+		// fmt.Println(string(reqBytes))
+		// respBytes, _ := httputil.DumpResponse(resp, true)
+		// fmt.Println(string(respBytes))
+		return nil, errors.New(resp.Status)
+	}
+
+	claims := map[string]any{}
+	if err = json.NewDecoder(resp.Body).Decode(&claims); err != nil {
+		// uncomment this for debugging when needed.
+		// reqBytes, _ := httputil.DumpRequest(req, false)
+		// fmt.Println(string(reqBytes))
+		// respBytes, _ := httputil.DumpResponse(resp, true)
+		// fmt.Println(string(respBytes))
+		return nil, err
+	}
+
+	return claims, nil
+}