252 lines
6.7 KiB
Go
252 lines
6.7 KiB
Go
package rfc2136
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import (
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"bytes"
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"fmt"
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"net"
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"strings"
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"sync"
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"testing"
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"time"
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"github.com/go-acme/lego/v4/challenge/dns01"
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"github.com/miekg/dns"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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const (
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fakeDomain = "123456789.www.example.com"
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fakeKeyAuth = "123d=="
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fakeValue = "Now36o-3BmlB623-0c1qCIUmgWVVmDJb88KGl24pqpo"
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fakeFqdn = "_acme-challenge.123456789.www.example.com."
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fakeZone = "example.com."
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fakeTTL = 120
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fakeTsigKey = "example.com."
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fakeTsigSecret = "IwBTJx9wrDp4Y1RyC3H0gA=="
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)
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func TestCanaryLocalTestServer(t *testing.T) {
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dns01.ClearFqdnCache()
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dns.HandleFunc("example.com.", serverHandlerHello)
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defer dns.HandleRemove("example.com.")
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server, addr, err := runLocalDNSTestServer(false)
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require.NoError(t, err, "Failed to start test server")
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defer func() { _ = server.Shutdown() }()
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c := new(dns.Client)
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m := new(dns.Msg)
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m.SetQuestion("example.com.", dns.TypeTXT)
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r, _, err := c.Exchange(m, addr)
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require.NoError(t, err, "Failed to communicate with test server")
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assert.Len(t, r.Extra, 1, "Failed to communicate with test server")
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txt := r.Extra[0].(*dns.TXT).Txt[0]
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assert.Equal(t, "Hello world", txt)
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}
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func TestServerSuccess(t *testing.T) {
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dns01.ClearFqdnCache()
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dns.HandleFunc(fakeZone, serverHandlerReturnSuccess)
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defer dns.HandleRemove(fakeZone)
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server, addr, err := runLocalDNSTestServer(false)
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require.NoError(t, err, "Failed to start test server")
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defer func() { _ = server.Shutdown() }()
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config := NewDefaultConfig()
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config.Nameserver = addr
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provider, err := NewDNSProviderConfig(config)
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require.NoError(t, err)
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err = provider.Present(fakeDomain, "", fakeKeyAuth)
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require.NoError(t, err)
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}
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func TestServerError(t *testing.T) {
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dns01.ClearFqdnCache()
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dns.HandleFunc(fakeZone, serverHandlerReturnErr)
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defer dns.HandleRemove(fakeZone)
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server, addr, err := runLocalDNSTestServer(false)
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require.NoError(t, err, "Failed to start test server")
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defer func() { _ = server.Shutdown() }()
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config := NewDefaultConfig()
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config.Nameserver = addr
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provider, err := NewDNSProviderConfig(config)
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require.NoError(t, err)
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err = provider.Present(fakeDomain, "", fakeKeyAuth)
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require.Error(t, err)
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if !strings.Contains(err.Error(), "NOTZONE") {
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t.Errorf("Expected Present() to return an error with the 'NOTZONE' rcode string, but it did not: %v", err)
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}
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}
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func TestTsigClient(t *testing.T) {
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dns01.ClearFqdnCache()
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dns.HandleFunc(fakeZone, serverHandlerReturnSuccess)
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defer dns.HandleRemove(fakeZone)
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server, addr, err := runLocalDNSTestServer(true)
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require.NoError(t, err, "Failed to start test server")
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defer func() { _ = server.Shutdown() }()
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config := NewDefaultConfig()
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config.Nameserver = addr
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config.TSIGKey = fakeTsigKey
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config.TSIGSecret = fakeTsigSecret
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provider, err := NewDNSProviderConfig(config)
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require.NoError(t, err)
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err = provider.Present(fakeDomain, "", fakeKeyAuth)
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require.NoError(t, err)
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}
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func TestValidUpdatePacket(t *testing.T) {
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reqChan := make(chan *dns.Msg, 10)
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dns01.ClearFqdnCache()
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dns.HandleFunc(fakeZone, serverHandlerPassBackRequest(reqChan))
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defer dns.HandleRemove(fakeZone)
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server, addr, err := runLocalDNSTestServer(false)
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require.NoError(t, err, "Failed to start test server")
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defer func() { _ = server.Shutdown() }()
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txtRR, _ := dns.NewRR(fmt.Sprintf("%s %d IN TXT %s", fakeFqdn, fakeTTL, fakeValue))
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rrs := []dns.RR{txtRR}
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m := new(dns.Msg)
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m.SetUpdate(fakeZone)
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m.RemoveRRset(rrs)
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m.Insert(rrs)
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expectStr := m.String()
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expect, err := m.Pack()
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require.NoError(t, err, "error packing")
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config := NewDefaultConfig()
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config.Nameserver = addr
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provider, err := NewDNSProviderConfig(config)
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require.NoError(t, err)
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err = provider.Present(fakeDomain, "", "1234d==")
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require.NoError(t, err)
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rcvMsg := <-reqChan
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rcvMsg.Id = m.Id
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actual, err := rcvMsg.Pack()
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require.NoError(t, err, "error packing")
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if !bytes.Equal(actual, expect) {
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tmp := new(dns.Msg)
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if err := tmp.Unpack(actual); err != nil {
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t.Fatalf("Error unpacking actual msg: %v", err)
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}
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t.Errorf("Expected msg:\n%s", expectStr)
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t.Errorf("Actual msg:\n%v", tmp)
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}
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}
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func runLocalDNSTestServer(tsig bool) (*dns.Server, string, error) {
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pc, err := net.ListenPacket("udp", "127.0.0.1:0")
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if err != nil {
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return nil, "", err
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}
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server := &dns.Server{
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PacketConn: pc,
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ReadTimeout: time.Hour,
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WriteTimeout: time.Hour,
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MsgAcceptFunc: func(dh dns.Header) dns.MsgAcceptAction {
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// bypass defaultMsgAcceptFunc to allow dynamic update (https://github.com/miekg/dns/pull/830)
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return dns.MsgAccept
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},
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}
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if tsig {
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server.TsigSecret = map[string]string{fakeTsigKey: fakeTsigSecret}
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}
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waitLock := sync.Mutex{}
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waitLock.Lock()
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server.NotifyStartedFunc = waitLock.Unlock
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go func() {
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_ = server.ActivateAndServe()
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pc.Close()
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}()
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waitLock.Lock()
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return server, pc.LocalAddr().String(), nil
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}
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func serverHandlerHello(w dns.ResponseWriter, req *dns.Msg) {
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m := new(dns.Msg)
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m.SetReply(req)
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m.Extra = make([]dns.RR, 1)
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m.Extra[0] = &dns.TXT{
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Hdr: dns.RR_Header{Name: m.Question[0].Name, Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 0},
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Txt: []string{"Hello world"},
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}
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_ = w.WriteMsg(m)
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}
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func serverHandlerReturnSuccess(w dns.ResponseWriter, req *dns.Msg) {
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m := new(dns.Msg)
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m.SetReply(req)
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if req.Opcode == dns.OpcodeQuery && req.Question[0].Qtype == dns.TypeSOA && req.Question[0].Qclass == dns.ClassINET {
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// Return SOA to appease findZoneByFqdn()
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soaRR, _ := dns.NewRR(fmt.Sprintf("%s %d IN SOA ns1.%s admin.%s 2016022801 28800 7200 2419200 1200", fakeZone, fakeTTL, fakeZone, fakeZone))
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m.Answer = []dns.RR{soaRR}
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}
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if t := req.IsTsig(); t != nil {
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if w.TsigStatus() == nil {
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// Validated
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m.SetTsig(fakeZone, dns.HmacSHA1, 300, time.Now().Unix())
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}
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}
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_ = w.WriteMsg(m)
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}
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func serverHandlerReturnErr(w dns.ResponseWriter, req *dns.Msg) {
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m := new(dns.Msg)
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m.SetRcode(req, dns.RcodeNotZone)
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_ = w.WriteMsg(m)
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}
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func serverHandlerPassBackRequest(reqChan chan *dns.Msg) func(w dns.ResponseWriter, req *dns.Msg) {
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return func(w dns.ResponseWriter, req *dns.Msg) {
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m := new(dns.Msg)
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m.SetReply(req)
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if req.Opcode == dns.OpcodeQuery && req.Question[0].Qtype == dns.TypeSOA && req.Question[0].Qclass == dns.ClassINET {
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// Return SOA to appease findZoneByFqdn()
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soaRR, _ := dns.NewRR(fmt.Sprintf("%s %d IN SOA ns1.%s admin.%s 2016022801 28800 7200 2419200 1200", fakeZone, fakeTTL, fakeZone, fakeZone))
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m.Answer = []dns.RR{soaRR}
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}
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if t := req.IsTsig(); t != nil {
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if w.TsigStatus() == nil {
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// Validated
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m.SetTsig(fakeZone, dns.HmacSHA1, 300, time.Now().Unix())
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}
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}
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_ = w.WriteMsg(m)
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if req.Opcode != dns.OpcodeQuery || req.Question[0].Qtype != dns.TypeSOA || req.Question[0].Qclass != dns.ClassINET {
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// Only talk back when it is not the SOA RR.
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reqChan <- req
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}
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}
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}
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