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|
package main
import (
"crypto/x509"
"encoding/pem"
"fmt"
"html/template"
"io/ioutil"
"os"
"sort"
"time"
)
func handleErr(err error, str string, a ...interface{}) {
a = append([]interface{}{err}, a...)
if err != nil {
fmt.Fprintf(os.Stderr, str, a...)
os.Exit(1)
}
}
func handleBool(ok bool, str string, a ...interface{}) {
if !ok {
fmt.Fprintf(os.Stderr, str, a...)
os.Exit(1)
}
}
var tmpl = template.Must(template.New("pem2html").
Funcs(template.FuncMap{
"red": red,
"green": green,
"date": fDate,
"datetime": fDateTime,
}).Parse(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Live Certs</title>
<style>
html {
height: 100%;
}
body {
font-size: 10px;
font-family: monospace;
height: 100%;
margin: 0;
display: flex;
align-items: center;
}
body > * {
margin: auto;
}
table {
border-collapse: collapse;
}
caption p {
margin: 0;
}
td, th {
padding: 0;
border: solid 1px black;
white-space: nowrap;
}
td {
background-color: #F3F3F3;
}
tr.invalid td {
background-color: #F30000 !important;
}
tr:hover td, tr.invalid:hover td {
background-color: #AAAAF3 !important;
}
td a {
padding: 0.1em 0.25em;
display: block;
width: 100%;
height: 100%;
color: black;
}
time .time {
display: none
}
</style>
<script src="sorttable.js"></script>
<base target="_parent" />
</head>
<body>
<table class=sortable>
<caption>
<p>Live Certs (Updated {{.now | datetime}})</p>
</caption>
<tr>
<th>NotBefore</th>
<th>NotAfter</th>
<th>Subject.CN</th>
<th>Socket</th>
</tr>
{{range $cert := .certs}}
<tr class="{{$cert.Class}}">
<td style="background-color: {{$cert.X509.NotBefore | green}}"><a href="{{$cert.Url}}" title="{{$cert.Error}}">{{$cert.X509.NotBefore | date}}</a></td>
<td style="background-color: {{$cert.X509.NotAfter | red }}"><a href="{{$cert.Url}}" title="{{$cert.Error}}">{{$cert.X509.NotAfter | date}}</a></td>
<td><a href="{{$cert.Url}}" title="{{$cert.Error}}">{{$cert.X509.Subject.CommonName | html}}</a></td>
<td><a href="{{$cert.Url}}" title="{{$cert.Error}}">{{$cert.Socket | html}}</a></td>
</tr>
{{end}}
</table>
</body>
</html>
`))
func fDate(t time.Time) template.HTML {
return template.HTML(t.Local().Format("<time datetime=\"2006-01-02 15:04:05\" title=\"2006-01-02 15:04:05\">2006-01-02 <span class=time>15:04:05</span></time>"))
}
func fDateTime(t time.Time) template.HTML {
return template.HTML(t.Local().Format("<time datetime=\"2006-01-02 15:04:05\">2006-01-02 15:04:05</time>"))
}
func getNow() time.Time {
stat, err := os.Stdin.Stat()
if err == nil {
return stat.ModTime()
} else {
return time.Now()
}
}
var now = getNow()
type interpolation struct {
ta, tb time.Time
ba, bb byte
}
func (i interpolation) interpolate(tc time.Time) byte {
db := i.tb.Sub(i.ta)
dc := tc.Sub(i.ta)
pct := float64(dc) / float64(db)
if pct < 0 {
pct = 0
} else if pct > 1 {
pct = 1
}
sb := int16(i.bb) - int16(i.ba)
sc := int16(pct * float64(sb))
return byte(int16(i.ba) + sc)
}
var daysago = interpolation{
ta: now.AddDate(0, 0, -30),
tb: now,
ba: 0xF3,
bb: 0x00,
}
var daysuntil = interpolation{
ta: now,
tb: now.AddDate(0, 0, 30),
ba: 0x00,
bb: 0xF3,
}
func green(t time.Time) string {
b := daysago.interpolate(t)
return fmt.Sprintf("#%02X%02X%02X", b, 0xF3, b)
}
func red(t time.Time) string {
b := daysuntil.interpolate(t)
return fmt.Sprintf("#%02X%02X%02X", 0xF3, b, b)
}
type Cert struct {
Socket string
Error string
X509 *x509.Certificate
}
func (cert Cert) Url() string {
return fmt.Sprintf("https://crt.sh/?serial=%036x", cert.X509.SerialNumber)
}
func (cert Cert) Class() string {
if cert.Error == "" {
return ""
} else {
return "invalid"
}
}
type Certs []Cert
// Len is the number of elements in the collection.
func (l Certs) Len() int {
return len(l)
}
// Less reports whether the element with
// index i should sort before the element with index j.
func (l Certs) Less(i, j int) bool {
return l[i].X509.NotAfter.After(l[j].X509.NotAfter)
}
// Swap swaps the elements with indexes i and j.
func (l Certs) Swap(i, j int) {
tmp := l[i]
l[i] = l[j]
l[j] = tmp
}
func main() {
data, err := ioutil.ReadAll(os.Stdin)
handleErr(err, "Error reading stdin: %v\n")
var certs Certs
for len(data) > 0 {
var certPem *pem.Block
certPem, data = pem.Decode(data)
var ok bool
var cert Cert
cert.Socket, ok = certPem.Headers["X-Socket"]
handleBool(ok, "Did not get X-Socket\n")
cert.Error, ok = certPem.Headers["X-Error"]
cert.X509, err = x509.ParseCertificate(certPem.Bytes)
handleErr(err, "Error parsing cert: %v\n")
certs = append(certs, cert)
}
sort.Sort(certs)
handleErr(tmpl.Execute(os.Stdout, map[string]interface{}{"certs":certs, "now": now}), "Could not execute template: %v\n")
}
|
