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cert_pool_nix.go
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cert_pool_nix.go
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//go:build !windows
// +build !windows
/*
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
*
* 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 certs
import (
"crypto/x509"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
// Possible directories with certificate files, this is an extended
// list from https://golang.org/src/crypto/x509/root_unix.go?#L18
// for k8s platform
var certDirectories = []string{
"/var/run/secrets/kubernetes.io/serviceaccount",
}
// readUniqueDirectoryEntries is like ioutil.ReadDir but omits
// symlinks that point within the directory.
func readUniqueDirectoryEntries(dir string) ([]os.FileInfo, error) {
fis, err := ioutil.ReadDir(dir)
if err != nil {
return nil, err
}
uniq := fis[:0]
for _, fi := range fis {
if !isSameDirSymlink(fi, dir) {
uniq = append(uniq, fi)
}
}
return uniq, nil
}
// isSameDirSymlink reports whether fi in dir is a symlink with a
// target not containing a slash.
func isSameDirSymlink(fi os.FileInfo, dir string) bool {
if fi.Mode()&os.ModeSymlink == 0 {
return false
}
target, err := os.Readlink(filepath.Join(dir, fi.Name()))
return err == nil && !strings.Contains(target, "/")
}
func loadSystemRoots() (*x509.CertPool, error) {
caPool, err := x509.SystemCertPool()
if err != nil {
return caPool, err
}
for _, directory := range certDirectories {
fis, err := readUniqueDirectoryEntries(directory)
if err != nil {
if os.IsNotExist(err) || os.IsPermission(err) {
return caPool, nil
}
return caPool, err
}
for _, fi := range fis {
data, err := ioutil.ReadFile(directory + "/" + fi.Name())
if err == nil {
caPool.AppendCertsFromPEM(data)
}
}
}
return caPool, nil
}