traefik/pkg/provider/acme/local_store_unix.go

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//go:build !windows
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// +build !windows
package acme
import (
"fmt"
"os"
)
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// CheckFile checks file permissions and content size.
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func CheckFile(name string) (bool, error) {
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f, err := os.Open(name)
if err != nil && os.IsNotExist(err) {
nf, err := os.Create(name)
if err != nil {
return false, err
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}
defer nf.Close()
return false, nf.Chmod(0o600)
}
if err != nil {
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return false, err
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}
defer f.Close()
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fi, err := f.Stat()
if err != nil {
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return false, err
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}
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if fi.Mode().Perm()&0o077 != 0 {
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return false, fmt.Errorf("permissions %o for %s are too open, please use 600", fi.Mode().Perm(), name)
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}
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return fi.Size() > 0, nil
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}