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// mkbundle is a commandline tool for building certificate pool bundles.
// All certificates in the input file paths are checked for revocation and bundled together.
//
// Usage:
// mkbundle -f bundle_file -nw number_of_workers certificate_file_path ...
package main
import (
"crypto/x509"
"encoding/pem"
"flag"
"io/ioutil"
"os"
"path/filepath"
"sync"
"github.com/cloudflare/cfssl/log"
"github.com/cloudflare/cfssl/revoke"
)
// worker does all the parsing and validation of the certificate(s)
// contained in a single file. It first reads all the data in the
// file, then begins parsing certificates in the file. Those
// certificates are then checked for revocation.
func worker(paths chan string, bundler chan *x509.Certificate, pool *sync.WaitGroup) {
defer (*pool).Done()
for {
path, ok := <-paths
if !ok {
return
}
log.Infof("Loading %s", path)
fileData, err := ioutil.ReadFile(path)
if err != nil {
log.Warningf("%v", err)
continue
}
for {
var block *pem.Block
if len(fileData) == 0 {
break
}
block, fileData = pem.Decode(fileData)
if block == nil {
log.Warningf("%s: no PEM data found", path)
break
} else if block.Type != "CERTIFICATE" {
log.Info("Skipping non-certificate")
continue
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
log.Warningf("Invalid certificate: %v", err)
continue
}
log.Infof("Validating %+v", cert.Subject)
revoked, ok := revoke.VerifyCertificate(cert)
if !ok {
log.Warning("Failed to verify certificate.")
} else if !revoked {
bundler <- cert
} else {
log.Info("Skipping revoked certificate")
}
}
}
}
// supervisor sets up the workers and signals the bundler that all
// certificates have been processed.
func supervisor(paths chan string, bundler chan *x509.Certificate, numWorkers int) {
var workerPool sync.WaitGroup
for i := 0; i < numWorkers; i++ {
workerPool.Add(1)
go worker(paths, bundler, &workerPool)
}
workerPool.Wait()
close(bundler)
}
// makeBundle opens the file for writing, and listens for incoming
// certificates. These are PEM-encoded and written to file.
func makeBundle(filename string, bundler chan *x509.Certificate) {
file, err := os.Create(filename)
if err != nil {
log.Errorf("%v", err)
return
}
defer file.Close()
var total int
for {
cert, ok := <-bundler
if !ok {
break
}
block := &pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Raw,
}
err = pem.Encode(file, block)
if err != nil {
log.Errorf("Failed to write PEM block: %v", err)
break
}
total++
}
log.Infof("Wrote %d certificates.", total)
}
// scanFiles walks the files listed in the arguments. These files may
// be either certificate files or directories containing certificates.
func scanFiles(paths chan string) {
walker := func(path string, info os.FileInfo, err error) error {
log.Infof("Found %s", path)
if err != nil {
return err
}
if info.Mode().IsRegular() {
paths <- path
}
return nil
}
for _, path := range flag.Args() {
err := filepath.Walk(path, walker)
if err != nil {
log.Errorf("Walk failed: %v", err)
}
}
close(paths)
}
func main() {
bundleFile := flag.String("f", "cert-bundle.crt", "path to store certificate bundle")
numWorkers := flag.Int("nw", 4, "number of workers")
flag.Parse()
paths := make(chan string)
bundler := make(chan *x509.Certificate)
go supervisor(paths, bundler, *numWorkers)
go scanFiles(paths)
makeBundle(*bundleFile, bundler)
}
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