151 lines
3.8 KiB
Go
151 lines
3.8 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"os"
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"bufio"
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"strings"
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"golang.org/x/net/idna"
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"src.agwa.name/ctwatch"
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"src.agwa.name/ctwatch/ct"
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"src.agwa.name/ctwatch/cmd"
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)
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func DefaultStateDir () string {
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if envVar := os.Getenv("CTWATCH_STATE_DIR"); envVar != "" {
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return envVar
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} else {
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return cmd.DefaultStateDir("ctwatch")
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}
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}
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func trimTrailingDots (value string) string {
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length := len(value)
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for length > 0 && value[length - 1] == '.' {
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length--
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}
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return value[0:length]
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}
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var stateDir = flag.String("state_dir", DefaultStateDir(), "Directory for storing state")
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var watchDomains []string
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var watchDomainSuffixes []string
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func addWatchDomain (asciiDomain string) {
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watchDomains = append(watchDomains, asciiDomain)
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watchDomainSuffixes = append(watchDomainSuffixes, "." + asciiDomain)
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}
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func setWatchDomains (domains []string) error {
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for _, domain := range domains {
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if domain == "." { // "." as in root zone (matches everything)
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watchDomains = []string{}
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watchDomainSuffixes = []string{""}
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break
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} else {
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asciiDomain, err := idna.ToASCII(strings.ToLower(trimTrailingDots(domain)))
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if err != nil {
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return fmt.Errorf("Invalid domain `%s': %s", domain, err)
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}
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addWatchDomain(asciiDomain)
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// Also monitor DNS names that _might_ match this domain (wildcards,
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// label redactions, and unparseable labels).
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// For example, if we're monitoring sub.example.com, also monitor:
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// *.example.com
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// ?.example.com
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// <invalid>.example.com
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var parentDomain string
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if dot := strings.IndexRune(asciiDomain, '.'); dot != -1 {
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parentDomain = asciiDomain[dot:]
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}
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addWatchDomain("*" + parentDomain)
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addWatchDomain("?" + parentDomain)
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addWatchDomain(ctwatch.InvalidDNSLabelPlaceholder + parentDomain)
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}
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}
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return nil
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}
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func dnsNameMatches (dnsName string) bool {
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for _, domain := range watchDomains {
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if dnsName == domain {
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return true
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}
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}
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for _, domainSuffix := range watchDomainSuffixes {
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if strings.HasSuffix(dnsName, domainSuffix) {
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return true
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}
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}
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return false
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}
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func anyDnsNameMatches (dnsNames []string) bool {
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for _, dnsName := range dnsNames {
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if dnsNameMatches(dnsName) {
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return true
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}
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}
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return false
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}
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func processEntry (scanner *ctwatch.Scanner, entry *ct.LogEntry) {
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info := ctwatch.EntryInfo{
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LogUri: scanner.LogUri,
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Entry: entry,
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IsPrecert: ctwatch.IsPrecert(entry),
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FullChain: ctwatch.GetFullChain(entry),
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}
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info.CertInfo, info.ParseError = ctwatch.MakeCertInfoFromLogEntry(entry)
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// If there's any sort of parse error related to the identifiers, report
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// the certificate because we can't say for sure it doesn't match a domain
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// we care about (fail safe behavior).
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if info.ParseError != nil ||
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info.CertInfo.IdentifiersParseError != nil ||
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anyDnsNameMatches(info.CertInfo.Identifiers.DNSNames) {
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cmd.LogEntry(&info)
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}
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}
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func main() {
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flag.Parse()
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if flag.NArg() == 0 {
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fmt.Fprintf(os.Stderr, "Usage: %s [flags] domain ...\n", os.Args[0])
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fmt.Fprintf(os.Stderr, "\n")
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fmt.Fprintf(os.Stderr, "To read domain list from stdin, use '-'. To monitor all domains, use '.'.\n")
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fmt.Fprintf(os.Stderr, "See '%s -help' for a list of valid flags.\n", os.Args[0])
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os.Exit(2)
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}
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if flag.NArg() == 1 && flag.Arg(0) == "-" {
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var domains []string
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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domains = append(domains, scanner.Text())
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}
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if err := scanner.Err(); err != nil {
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fmt.Fprintf(os.Stderr, "%s: Error reading standard input: %s\n", os.Args[0], err)
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os.Exit(1)
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}
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if err := setWatchDomains(domains); err != nil {
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fmt.Fprintf(os.Stderr, "%s: %s\n", os.Args[0], err)
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os.Exit(1)
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}
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} else {
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if err := setWatchDomains(flag.Args()); err != nil {
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fmt.Fprintf(os.Stderr, "%s: %s\n", os.Args[0], err)
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os.Exit(1)
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}
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}
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cmd.Main(*stateDir, processEntry)
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}
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