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Add support for IDNs

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IDNs can be specified in either Unicode or ASCII (as Punycode).
Certs can specify the DNS name either way, and we'll match it.
This commit is contained in:
Andrew Ayer 2016-04-26 14:38:09 -07:00
parent 19c5f86d23
commit 4132ed5e9f
1 changed files with 34 additions and 5 deletions
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39
cmd/ctwatch/main.go
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@ -7,6 +7,8 @@ import (
"bufio"
"strings"
"golang.org/x/net/idna"
"src.agwa.name/ctwatch"
"src.agwa.name/ctwatch/ct"
"src.agwa.name/ctwatch/cmd"
@ -24,17 +26,38 @@ var stateDir = flag.String("state_dir", DefaultStateDir(), "Directory for storin
var watchDomains []string
var watchDomainSuffixes []string
func setWatchDomains (domains []string) {
func addWatchDomain (domain string) {
watchDomains = append(watchDomains, strings.ToLower(domain))
watchDomainSuffixes = append(watchDomainSuffixes, "." + strings.ToLower(domain))
}
func setWatchDomains (domains []string) error {
for _, domain := range domains {
if domain == "." { // "." as in root zone (matches everything)
watchDomains = []string{}
watchDomainSuffixes = []string{""}
break
} else {
watchDomains = append(watchDomains, strings.ToLower(domain))
watchDomainSuffixes = append(watchDomainSuffixes, "." + strings.ToLower(domain))
addWatchDomain(domain)
asciiDomain, err := idna.ToASCII(domain)
if err != nil {
return fmt.Errorf("Invalid domain `%s': %s", domain, err)
}
if asciiDomain != domain {
addWatchDomain(asciiDomain)
}
unicodeDomain, err := idna.ToUnicode(domain)
if err != nil {
return fmt.Errorf("Invalid domain `%s': %s", domain, err)
}
if unicodeDomain != domain {
addWatchDomain(unicodeDomain)
}
}
}
return nil
}
func dnsNameMatches (dnsName string) bool {
@ -105,9 +128,15 @@ func main() {
fmt.Fprintf(os.Stderr, "%s: Error reading standard input: %s\n", os.Args[0], err)
os.Exit(1)
}
setWatchDomains(domains)
if err := setWatchDomains(domains); err != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", os.Args[0], err)
os.Exit(1)
}
} else {
setWatchDomains(flag.Args())
if err := setWatchDomains(flag.Args()); err != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", os.Args[0], err)
os.Exit(1)
}
}
cmd.Main(*stateDir, processEntry)