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package main
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"io/ioutil"
"math/big"
"net"
"strings"
"sync/atomic"
"testing"
"time"
proxyproto "github.com/armon/go-proxyproto"
)
func TestRouting(t *testing.T) {
// Backend servers
s1, err := serveTLS(t, "server1", false, "test.com")
if err != nil {
t.Fatalf("serve TLS server1: %s", err)
}
defer s1.Close()
s2, err := serveTLS(t, "server2", false, "foo.net")
if err != nil {
t.Fatalf("serve TLS server2: %s", err)
}
defer s2.Close()
s3, err := serveTLS(t, "server3", false, "blarghblargh.acme.invalid")
if err != nil {
t.Fatalf("server TLS server3: %s", err)
}
defer s3.Close()
s4, err := serveTLS(t, "server4", true, "proxy.design")
if err != nil {
t.Fatalf("server TLS server4: %s", err)
}
defer s4.Close()
// One proxy
var p Proxy
l, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatalf("create listener: %s", err)
}
defer l.Close()
go p.Serve(l)
if err := p.Config.ReadString(fmt.Sprintf(`
test.com %s
foo.net %s
borkbork.tf %s
proxy.design %s PROXY
`, s1.Addr(), s2.Addr(), s3.Addr(), s4.Addr())); err != nil {
t.Fatalf("configure proxy: %s", err)
}
for _, test := range []struct {
N, V string
P *x509.CertPool
OK bool
Transparent bool
}{
{"test.com", "server1", s1.Pool, true, false},
{"foo.net", "server2", s2.Pool, true, false},
{"bar.org", "", s1.Pool, false, false},
{"blarghblargh.acme.invalid", "server3", s3.Pool, true, false},
{"proxy.design", "server4", s4.Pool, true, true},
} {
res, transparent, err := getTLS(l.Addr().String(), test.N, test.P)
switch {
case test.OK && err != nil:
t.Fatalf("get %q failed: %s", test.N, err)
case !test.OK && err == nil:
t.Fatalf("get %q should have failed, but returned %q", test.N, res)
case test.OK && res != test.V:
t.Fatalf("got wrong value from %q, got %q, want %q", test.N, res, test.V)
case test.OK && transparent != test.Transparent:
t.Fatalf("connection transparency for %q was %v, want %v", test.N, transparent, test.Transparent)
}
}
}
// getTLS attempts to set up a TLS session using the given proxy
// address, domain, and cert pool. It returns the value served by the
// server, as well as a bool indicating whether the server knew the
// true client address, indicating that the PROXY protocol was in use.
func getTLS(addr string, domain string, pool *x509.CertPool) (string, bool, error) {
cfg := tls.Config{
RootCAs: pool,
ServerName: domain,
}
conn, err := tls.Dial("tcp", addr, &cfg)
if err != nil {
return "", false, fmt.Errorf("dial TLS %q for %q: %s", addr, domain, err)
}
defer conn.Close()
bs, err := ioutil.ReadAll(conn)
if err != nil {
return "", false, fmt.Errorf("read TLS from %q (domain %q): %s", addr, domain, err)
}
fs := strings.Split(string(bs), " ")
if len(fs) != 2 {
return "", false, fmt.Errorf("read TLS from %q (domain %q): incoherent response %q", addr, domain, string(bs))
}
transparent := fs[1] == conn.LocalAddr().String()
return fs[0], transparent, nil
}
type tlsServer struct {
Domains []string
Value string
Pool *x509.CertPool
Test *testing.T
NumHits uint32
l net.Listener
}
func (s *tlsServer) Serve() {
for {
c, err := s.l.Accept()
if err != nil {
s.Test.Logf("accept failed on %q: %s", s.Domains, err)
return
}
atomic.AddUint32(&s.NumHits, 1)
fmt.Fprintf(c, "%s %s", s.Value, c.RemoteAddr())
c.Close()
}
}
func (s *tlsServer) Addr() string {
return s.l.Addr().String()
}
func (s *tlsServer) Close() error {
return s.l.Close()
}
func serveTLS(t *testing.T, value string, understandProxy bool, domains ...string) (*tlsServer, error) {
cert, pool, err := selfSignedCert(domains)
if err != nil {
return nil, err
}
cfg := &tls.Config{
Certificates: []tls.Certificate{cert},
}
cfg.BuildNameToCertificate()
var l net.Listener
l, err = net.Listen("tcp", "localhost:0")
if err != nil {
return nil, err
}
if understandProxy {
l = &proxyproto.Listener{Listener: l}
}
l = tls.NewListener(l, cfg)
ret := &tlsServer{
Domains: domains,
Value: value,
Pool: pool,
Test: t,
l: l,
}
go ret.Serve()
return ret, nil
}
func selfSignedCert(domains []string) (tls.Certificate, *x509.CertPool, error) {
pkey, err := rsa.GenerateKey(rand.Reader, 512)
if err != nil {
return tls.Certificate{}, nil, err
}
template := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
Organization: []string{"Test Co"},
CommonName: domains[0],
},
NotBefore: time.Time{},
NotAfter: time.Now().Add(60 * time.Minute),
IsCA: true,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
DNSNames: domains[1:],
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, template, &pkey.PublicKey, pkey)
if err != nil {
return tls.Certificate{}, nil, err
}
var cert, key bytes.Buffer
pem.Encode(&cert, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
pem.Encode(&key, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(pkey)})
tlscert, err := tls.X509KeyPair(cert.Bytes(), key.Bytes())
if err != nil {
return tls.Certificate{}, nil, err
}
pool := x509.NewCertPool()
if !pool.AppendCertsFromPEM(cert.Bytes()) {
return tls.Certificate{}, nil, fmt.Errorf("failed to add cert %q to pool", domains)
}
return tlscert, pool, nil
}
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