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csrverifier.go
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/
csrverifier.go
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// Package executablecsrverifier defines the ExecutableCSRVerifier csrverifier.CSRVerifier.
package executablecsrverifier
import (
"errors"
"os"
"os/exec"
"github.com/go-kit/kit/log"
)
const (
userExecute os.FileMode = 1 << (6 - 3*iota)
groupExecute
otherExecute
)
// New creates a executablecsrverifier.ExecutableCSRVerifier.
func New(path string, logger log.Logger) (*ExecutableCSRVerifier, error) {
fileInfo, err := os.Stat(path)
if err != nil {
return nil, err
}
fileMode := fileInfo.Mode()
if fileMode.IsDir() {
return nil, errors.New("CSR Verifier executable is a directory")
}
filePerm := fileMode.Perm()
if filePerm&(userExecute|groupExecute|otherExecute) == 0 {
return nil, errors.New("CSR Verifier executable is not executable")
}
return &ExecutableCSRVerifier{executable: path, logger: logger}, nil
}
// ExecutableCSRVerifier implements a csrverifier.CSRVerifier.
// It executes a command, and passes it the raw decrypted CSR.
// If the command exit code is 0, the CSR is considered valid.
// In any other cases, the CSR is considered invalid.
type ExecutableCSRVerifier struct {
executable string
logger log.Logger
}
func (v *ExecutableCSRVerifier) Verify(data []byte) (bool, error) {
cmd := exec.Command(v.executable)
stdin, err := cmd.StdinPipe()
if err != nil {
return false, err
}
go func() {
defer stdin.Close()
stdin.Write(data)
}()
err = cmd.Run()
if err != nil {
v.logger.Log("err", err)
// mask the executable error
return false, nil
}
return true, err
}