Initial import.

cmd/certchain/certchain.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"crypto/tls"
+	"encoding/pem"
+	"flag"
+	"fmt"
+	"regexp"
+
+	"github.com/kisom/goutils/die"
+)
+
+var hasPort = regexp.MustCompile(`:\d+$`)
+
+func main() {
+	flag.Parse()
+
+	for _, server := range flag.Args() {
+		if !hasPort.MatchString(server) {
+			server += ":443"
+		}
+
+		var chain string
+
+		conn, err := tls.Dial("tcp", server, nil)
+		die.If(err)
+
+		details := conn.ConnectionState()
+		for _, cert := range details.PeerCertificates {
+			p := pem.Block{
+				Type:  "CERTIFICATE",
+				Bytes: cert.Raw,
+			}
+			chain += string(pem.EncodeToMemory(&p))
+		}
+
+		fmt.Println(chain)
+	}
+}