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scanner.go
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scanner.go
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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 main
import (
"encoding/base64"
"flag"
"fmt"
"log"
"math/big"
"net/http"
"regexp"
"time"
ct "github.com/google/certificate-transparency-go"
"github.com/google/certificate-transparency-go/client"
"github.com/google/certificate-transparency-go/jsonclient"
"github.com/google/certificate-transparency-go/scanner"
)
const (
// matchesNothingRegex is a regex which cannot match any input.
matchesNothingRegex = "a^"
)
var logURI = flag.String("log_uri", "http://ct.googleapis.com/aviator", "CT log base URI")
var matchSubjectRegex = flag.String("match_subject_regex", ".*", "Regex to match CN/SAN")
var matchIssuerRegex = flag.String("match_issuer_regex", "", "Regex to match in issuer CN")
var precertsOnly = flag.Bool("precerts_only", false, "Only match precerts")
var serialNumber = flag.String("serial_number", "", "Serial number of certificate of interest")
var batchSize = flag.Int("batch_size", 1000, "Max number of entries to request at per call to get-entries")
var numWorkers = flag.Int("num_workers", 2, "Number of concurrent matchers")
var parallelFetch = flag.Int("parallel_fetch", 2, "Number of concurrent GetEntries fetches")
var startIndex = flag.Int64("start_index", 0, "Log index to start scanning at")
var quiet = flag.Bool("quiet", false, "Don't print out extra logging messages, only matches.")
var printChains = flag.Bool("print_chains", false, "If true prints the whole chain rather than a summary")
// Prints out a short bit of info about |cert|, found at |index| in the
// specified log
func logCertInfo(entry *ct.LogEntry) {
log.Printf("Interesting cert at index %d: CN: '%s'", entry.Index, entry.X509Cert.Subject.CommonName)
}
// Prints out a short bit of info about |precert|, found at |index| in the
// specified log
func logPrecertInfo(entry *ct.LogEntry) {
log.Printf("Interesting precert at index %d: CN: '%s' Issuer: %s", entry.Index,
entry.Precert.TBSCertificate.Subject.CommonName, entry.Precert.TBSCertificate.Issuer.CommonName)
}
func chainToString(certs []ct.ASN1Cert) string {
var output []byte
for _, cert := range certs {
output = append(output, cert.Data...)
}
return base64.StdEncoding.EncodeToString(output)
}
func logFullChain(entry *ct.LogEntry) {
log.Printf("Index %d: Chain: %s", entry.Index, chainToString(entry.Chain))
}
func createRegexes(regexValue string) (*regexp.Regexp, *regexp.Regexp) {
// Make a regex matcher
var certRegex *regexp.Regexp
precertRegex := regexp.MustCompile(regexValue)
switch *precertsOnly {
case true:
certRegex = regexp.MustCompile(matchesNothingRegex)
case false:
certRegex = precertRegex
}
return certRegex, precertRegex
}
func createMatcherFromFlags() (scanner.Matcher, error) {
if *matchIssuerRegex != "" {
certRegex, precertRegex := createRegexes(*matchIssuerRegex)
return scanner.MatchIssuerRegex{
CertificateIssuerRegex: certRegex,
PrecertificateIssuerRegex: precertRegex}, nil
}
if *serialNumber != "" {
log.Printf("Using SerialNumber matcher on %s", *serialNumber)
var sn big.Int
_, success := sn.SetString(*serialNumber, 0)
if !success {
return nil, fmt.Errorf("Invalid serialNumber %s", *serialNumber)
}
return scanner.MatchSerialNumber{SerialNumber: sn}, nil
}
certRegex, precertRegex := createRegexes(*matchSubjectRegex)
return scanner.MatchSubjectRegex{
CertificateSubjectRegex: certRegex,
PrecertificateSubjectRegex: precertRegex}, nil
}
func main() {
flag.Parse()
logClient, err := client.New(*logURI, &http.Client{
Timeout: 10 * time.Second,
Transport: &http.Transport{
TLSHandshakeTimeout: 30 * time.Second,
ResponseHeaderTimeout: 30 * time.Second,
MaxIdleConnsPerHost: 10,
DisableKeepAlives: false,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
},
}, jsonclient.Options{})
if err != nil {
log.Fatal(err)
}
matcher, err := createMatcherFromFlags()
if err != nil {
log.Fatal(err)
}
opts := scanner.ScannerOptions{
Matcher: matcher,
BatchSize: *batchSize,
NumWorkers: *numWorkers,
ParallelFetch: *parallelFetch,
StartIndex: *startIndex,
Quiet: *quiet,
}
scanner := scanner.NewScanner(logClient, opts)
if *printChains {
scanner.Scan(logFullChain, logFullChain)
} else {
scanner.Scan(logCertInfo, logPrecertInfo)
}
}