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// Copyright 2022 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package identity
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"strings"
"github.com/sigstore/fulcio/pkg/config"
)
type IssuerPool []Issuer
func (p IssuerPool) Authenticate(ctx context.Context, token string, opts ...config.InsecureOIDCConfigOption) (Principal, error) {
url, err := extractIssuerURL(token)
if err != nil {
return nil, err
}
for _, issuer := range p {
if issuer.Match(ctx, url) {
return issuer.Authenticate(ctx, token, opts...)
}
}
return nil, fmt.Errorf("failed to match issuer URL %s from token with any configured providers", url)
}
func extractIssuerURL(token string) (string, error) {
parts := strings.Split(token, ".")
if len(parts) != 3 {
return "", fmt.Errorf("oidc: malformed jwt, expected 3 parts got %d", len(parts))
}
raw, err := base64.RawURLEncoding.DecodeString(parts[1])
if err != nil {
return "", fmt.Errorf("oidc: malformed jwt payload: %w", err)
}
var payload struct {
Issuer string `json:"iss"`
}
if err := json.Unmarshal(raw, &payload); err != nil {
return "", fmt.Errorf("oidc: failed to unmarshal claims: %w", err)
}
return payload.Issuer, nil
}
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