fallback.go

// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package fallback embeds a set of fallback X.509 trusted roots in the
// application by automatically invoking [x509.SetFallbackRoots]. This allows
// the application to work correctly even if the operating system does not
// provide a verifier or system roots pool.
//
// To use it, import the package like
//
//	import _ "golang.org/x/crypto/x509roots/fallback"
//
// It's recommended that only binaries, and not libraries, import this package.
//
// This package must be kept up to date for security and compatibility reasons.
// Use govulncheck to be notified of when new versions of the package are
// available.
package fallback

import "crypto/x509"

func init() {
	p := x509.NewCertPool()
	for _, c := range parsedCertificates {
		if len(c.constraints) == 0 {
			p.AddCert(c.cert)
		} else {
			p.AddCertWithConstraint(c.cert, func(chain []*x509.Certificate) error {
				for _, constraint := range c.constraints {
					if err := constraint(chain); err != nil {
						return err
					}
				}
				return nil
			})
		}
	}
	x509.SetFallbackRoots(p)
}