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// Copyright 2011 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.
//go:build aix || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris
package x509
import (
"io/fs"
"os"
"path/filepath"
"strings"
)
const (
// certFileEnv is the environment variable which identifies where to locate
// the SSL certificate file. If set this overrides the system default.
certFileEnv = "SSL_CERT_FILE"
// certDirEnv is the environment variable which identifies which directory
// to check for SSL certificate files. If set this overrides the system default.
// It is a colon separated list of directories.
// See https://www.openssl.org/docs/man1.0.2/man1/c_rehash.html.
certDirEnv = "SSL_CERT_DIR"
)
func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
return nil, nil
}
func loadSystemRoots() (*CertPool, error) {
roots := NewCertPool()
files := certFiles
if f := os.Getenv(certFileEnv); f != "" {
files = []string{f}
}
var firstErr error
for _, file := range files {
data, err := os.ReadFile(file)
if err == nil {
roots.AppendCertsFromPEM(data)
break
}
if firstErr == nil && !os.IsNotExist(err) {
firstErr = err
}
}
dirs := certDirectories
if d := os.Getenv(certDirEnv); d != "" {
// OpenSSL and BoringSSL both use ":" as the SSL_CERT_DIR separator.
// See:
// * https://golang.org/issue/35325
// * https://www.openssl.org/docs/man1.0.2/man1/c_rehash.html
dirs = strings.Split(d, ":")
}
for _, directory := range dirs {
fis, err := readUniqueDirectoryEntries(directory)
if err != nil {
if firstErr == nil && !os.IsNotExist(err) {
firstErr = err
}
continue
}
for _, fi := range fis {
data, err := os.ReadFile(directory + "/" + fi.Name())
if err == nil {
roots.AppendCertsFromPEM(data)
}
}
}
if roots.len() > 0 || firstErr == nil {
return roots, nil
}
return nil, firstErr
}
// readUniqueDirectoryEntries is like os.ReadDir but omits
// symlinks that point within the directory.
func readUniqueDirectoryEntries(dir string) ([]fs.DirEntry, error) {
files, err := os.ReadDir(dir)
if err != nil {
return nil, err
}
uniq := files[:0]
for _, f := range files {
if !isSameDirSymlink(f, dir) {
uniq = append(uniq, f)
}
}
return uniq, nil
}
// isSameDirSymlink reports whether fi in dir is a symlink with a
// target not containing a slash.
func isSameDirSymlink(f fs.DirEntry, dir string) bool {
if f.Type()&fs.ModeSymlink == 0 {
return false
}
target, err := os.Readlink(filepath.Join(dir, f.Name()))
return err == nil && !strings.Contains(target, "/")
}
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