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sslexpired.go
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sslexpired.go
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package main
import (
"crypto/tls"
"crypto/x509"
"encoding/json"
"fmt"
"net"
"os"
"sort"
"strconv"
"strings"
"time"
)
const version = "0.1.1"
// SSLCerts returns a slice of x509 Certificates available at the
// target hostname
func SSLCerts(host string) ([]*x509.Certificate, error) {
conf := &tls.Config{
InsecureSkipVerify: true,
}
dialer := &net.Dialer{
Timeout: 5 * time.Second,
}
conn, err := tls.DialWithDialer(dialer, "tcp", host+":443", conf)
if err != nil {
return nil, err
}
conn.Close()
return conn.ConnectionState().PeerCertificates, nil
}
func validateInput(args []string, delta int) (map[string]interface{}, bool) {
msg := make(map[string]interface{})
// native OpenWhisk actions receive one argument, the JSON object as a string
if len(args) != 2 {
msg["err"] = fmt.Sprintf("wrong number of arguments: "+
"expected 1 received %d", (len(args) - 1))
return msg, false
}
// unmarshal the string to a JSON object
var obj map[string]interface{}
err := json.Unmarshal([]byte(args[1]), &obj)
if err != nil {
msg["err"] = err.Error()
return msg, false
}
// host parameter IS mandatory
host, ok := obj["host"].(string)
if !ok || host == "" {
msg["err"] = "malformed request: missing host string"
return msg, false
}
msg["host"] = host
// days parameter is not mandatory, we use default if not present
days, ok := obj["days"]
if ok {
switch days.(type) {
case string:
d, err := strconv.Atoi(days.(string))
if err != nil {
msg["err"] = "failed to parse days parameter: " + err.Error()
return msg, false
}
msg["daysTolerance"] = d
default:
msg["err"] = fmt.Sprintf("days parameter malformatted: %T, must be string", days)
return msg, false
}
} else {
msg["daysTolerance"] = delta
}
return msg, true
}
func daysLeft(cert *x509.Certificate) float64 {
return cert.NotAfter.Sub(time.Now()).Hours() / 24
}
func issuedBy(cert *x509.Certificate) string {
if len(cert.Issuer.Organization) > 0 {
return cert.Issuer.Organization[0]
}
return ""
}
func matchFound(host string, cert *x509.Certificate) bool {
if cert.Subject.CommonName == host {
return true
}
for _, name := range cert.DNSNames {
if host == name {
return true
}
}
return false
}
func allCertHosts(cert *x509.Certificate) []string {
set := map[string]struct{}{}
set[cert.Subject.CommonName] = struct{}{}
for _, name := range cert.DNSNames {
set[name] = struct{}{}
}
var hosts []string
for name := range set {
hosts = append(hosts, name)
}
sort.Strings(hosts)
return hosts
}
func hostInCert(host string, cert *x509.Certificate) bool {
if matchFound(host, cert) {
return true
}
// if exact match for host is not found, we search for a wildcard
// replacing the first part of the hostname with *
splitted := strings.Split(host, ".")
if len(splitted) > 2 {
splitted[0] = "*"
return matchFound(strings.Join(splitted, "."), cert)
}
return false
}
func parsedMsg(msg map[string]interface{}) string {
resp, err := json.Marshal(msg)
if err != nil {
return fmt.Sprintf(`{"err":"%s"}`, err)
}
return fmt.Sprint(string(resp))
}
func validateSSL(msg map[string]interface{}, cert *x509.Certificate) map[string]interface{} {
dLeft := daysLeft(cert)
msg["daysLeft"] = int(dLeft) // we round the number to biggest integer
msg["response"] = fmt.Sprintf("SSL certificate for %s will expire in %d days",
msg["host"], msg["daysLeft"])
msg["notAfter"] = cert.NotAfter.String()
msg["validHosts"] = allCertHosts(cert)
msg["issuedBy"] = issuedBy(cert)
if dLeft < float64(msg["daysTolerance"].(int)) {
msg["alert"] = true
}
if !hostInCert(msg["host"].(string), cert) {
msg["alert"] = true
msg["err"] = fmt.Sprintf("host %s not valid for the SSL certificate", msg["host"])
}
return msg
}
func main() {
msg, ok := validateInput(os.Args, 30)
if !ok {
fmt.Println(parsedMsg(msg))
return
}
certs, err := SSLCerts(msg["host"].(string))
if err != nil {
delete(msg, "daysTolerance")
msg["err"] = err.Error()
fmt.Println(parsedMsg(msg))
return
}
if len(certs) == 0 {
msg["err"] = "certificates list is empty"
fmt.Println(parsedMsg(msg))
return
}
// We check only the first certificate in the chain
fmt.Println(parsedMsg(validateSSL(msg, certs[0])))
}