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TSIG works!

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This commit is contained in:
Miek Gieben 2011-03-15 18:56:27 +01:00
parent 3867e7d7d8
commit b56344d41d
2 changed files with 15 additions and 18 deletions
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7
resolver.go
View File

@ -262,7 +262,6 @@ func (res *Resolver) AxfrTSIG(q *Msg, m chan Xfr, secret string) {
reqmac = q.Extra[len(q.Extra)-1].(*RR_TSIG).MAC reqmac = q.Extra[len(q.Extra)-1].(*RR_TSIG).MAC
} }
} }
println("REQMAC", reqmac)
Server: Server:
for i := 0; i < len(res.Servers); i++ { for i := 0; i < len(res.Servers); i++ {
@ -276,12 +275,6 @@ Server:
for { for {
if first { if first {
inb, err = exchangeTCP(c, sending, res, true) inb, err = exchangeTCP(c, sending, res, true)
stripTSIG(inb)
/*
pt2 := new(Msg)
pt2.Unpack(t2)
//println("P", pt2.String())
*/
in.Unpack(inb) in.Unpack(inb)
} else { } else {
inb, err = exchangeTCP(c, sending, res, false) inb, err = exchangeTCP(c, sending, res, false)

26
tsig.go
View File

@ -91,8 +91,14 @@ func (t *RR_TSIG) Generate(m *Msg, secret string) bool {
} }
t.OrigId = m.MsgHdr.Id t.OrigId = m.MsgHdr.Id
msg, _ := m.Pack() msg, ok := m.Pack()
buf, ok := tsigToBuf(t, msg, "") if !ok {
return false
}
buf, ok1 := tsigToBuf(t, msg, "")
if !ok1 {
return false
}
h := hmac.NewMD5([]byte(rawsecret)) h := hmac.NewMD5([]byte(rawsecret))
io.WriteString(h, string(buf)) io.WriteString(h, string(buf))
@ -130,15 +136,13 @@ func (t *RR_TSIG) Verify(msg []byte, secret, reqmac string) bool {
h := hmac.NewMD5([]byte(rawsecret)) h := hmac.NewMD5([]byte(rawsecret))
io.WriteString(h, string(buf)) io.WriteString(h, string(buf))
println("t.MAC", strings.ToUpper(t.MAC)) return strings.ToUpper(hex.EncodeToString(h.Sum())) == strings.ToUpper(t.MAC)
println("our MAC", strings.ToUpper(hex.EncodeToString(h.Sum())))
println("req mac", reqmac)
return strings.ToUpper(hex.EncodeToString(h.Sum())) == strings.ToUpper(reqmac)
} }
// Create the buffer which we use for the MAC calculation.
func tsigToBuf(rr *RR_TSIG, msg []byte, reqmac string) ([]byte, bool) { func tsigToBuf(rr *RR_TSIG, msg []byte, reqmac string) ([]byte, bool) {
var ( var (
mb []byte macbuf []byte
buf []byte buf []byte
) )
@ -146,12 +150,12 @@ func tsigToBuf(rr *RR_TSIG, msg []byte, reqmac string) ([]byte, bool) {
m := new(macWireFmt) m := new(macWireFmt)
m.MACSize = uint16(len(reqmac) / 2) m.MACSize = uint16(len(reqmac) / 2)
m.MAC = reqmac m.MAC = reqmac
mb = make([]byte, len(reqmac)) // reqmac should be twice as long macbuf = make([]byte, len(reqmac)) // reqmac should be twice as long
n, ok := packStruct(m, mb, 0) n, ok := packStruct(m, macbuf, 0)
if !ok { if !ok {
return nil, false return nil, false
} }
mb = mb[:n] macbuf = macbuf[:n]
} }
tsigvar := make([]byte, DefaultMsgSize) tsigvar := make([]byte, DefaultMsgSize)
@ -171,7 +175,7 @@ func tsigToBuf(rr *RR_TSIG, msg []byte, reqmac string) ([]byte, bool) {
} }
tsigvar = tsigvar[:n] tsigvar = tsigvar[:n]
if reqmac != "" { if reqmac != "" {
x := append(mb, msg...) x := append(macbuf, msg...)
buf = append(x, tsigvar...) buf = append(x, tsigvar...)
} else { } else {
buf = append(msg, tsigvar...) buf = append(msg, tsigvar...)