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|
package main
import (
"crypto/tls"
"crypto/x509"
"encoding/pem"
"encoding/xml"
"fmt"
"io"
"net"
"os"
"strings"
)
type xmppStreamsFeatures struct {
XMLName xml.Name `xml:"http://etherx.jabber.org/streams features"`
}
type xmppTlsProceed struct {
XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-tls proceed"`
}
func tlsDial(snet, saddr string) (*tls.Conn, error) {
switch snet {
case "tcp":
conn, err := tls.Dial(snet, saddr, &tls.Config{InsecureSkipVerify: true})
if err != nil {
return nil, err
}
return conn, nil
case "xmpp":
host, _, err := net.SplitHostPort(saddr)
connTCP, err := net.Dial("tcp", saddr)
if err != nil {
return nil, err
}
decoder := xml.NewDecoder(connTCP)
// send <stream> start
_, err = fmt.Fprintf(connTCP, "<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' to='%s' version='1.0'>", host)
if err != nil {
return nil, err
}
// read <stream> start
for {
t, err := decoder.Token()
if err != nil || t == nil {
return nil, err
}
if se, ok := t.(xml.StartElement); ok {
if se.Name.Local != "stream" {
return nil, xml.UnmarshalError(fmt.Sprintf("expected element of type <%s> but have <%s>", "stream", se.Name.Local))
}
break
}
}
// read <features>
var features xmppStreamsFeatures
err = decoder.DecodeElement(&features, nil)
if err != nil {
return nil, err
}
// send <starttls>
_, err = io.WriteString(connTCP, "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>")
if err != nil {
return nil, err
}
// read <proceed>
var proceed xmppTlsProceed
err = decoder.DecodeElement(&proceed, nil)
if err != nil {
return nil, err
}
connTLS := tls.Client(connTCP, &tls.Config{InsecureSkipVerify: true})
err = connTLS.Handshake()
if err != nil {
return nil, err
}
return connTLS, nil
default:
return nil, fmt.Errorf("Unknown TLS network: %q", snet)
}
}
func getcert(socket string) (*x509.Certificate, error){
snet, saddr := split(socket)
host, _, err := net.SplitHostPort(saddr)
if err != nil {
return nil, err
}
conn, err := tlsDial(snet, saddr)
if err != nil {
return nil, err
}
defer conn.Close()
cstate := conn.ConnectionState()
opts := x509.VerifyOptions{
DNSName: host,
Intermediates: x509.NewCertPool(),
}
for _, cert := range cstate.PeerCertificates[1:] {
opts.Intermediates.AddCert(cert)
}
cert := cstate.PeerCertificates[0]
_, err = cert.Verify(opts)
return cert, err
}
func split(socket string) (net, addr string) {
ary := strings.SplitN(socket, ":", 2)
if len(ary) == 1 {
return "tcp", ary[0]
}
return ary[0], ary[1]
}
func main() {
for _, socket := range os.Args[1:] {
cert, err := getcert(socket)
if cert == nil {
fmt.Fprintf(os.Stderr, "Could not get certificate for socket %q: %q\n", socket, err)
os.Exit(1)
}
block := pem.Block{
Type: "CERTIFICATE",
Headers: map[string]string{"X-Socket": socket},
Bytes: cert.Raw,
}
if err != nil {
block.Headers["X-Error"] = err.Error()
}
pem.Encode(os.Stdout, &block)
}
}
|
