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Unofficially support DoH/ODoH over HTTP

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This commit is contained in:
Frank Denis 2023-09-05 22:37:11 +02:00
parent 87571d4a7f
commit 8bea679e7b
1 changed files with 34 additions and 25 deletions
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17
dnscrypt-proxy/serversInfo.go
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@ -854,10 +854,17 @@ func _fetchODoHTargetInfo(proxy *Proxy, name string, stamp stamps.ServerStamp, i
if msg.Rcode != dns.RcodeNameError {
dlog.Criticalf("[%s] may be a lying resolver", name)
}
protocol := tls.NegotiatedProtocol
protocol := "http"
tlsVersion := uint16(0)
tlsCipherSuite := uint16(0)
if tls != nil {
protocol = tls.NegotiatedProtocol
if len(protocol) == 0 {
protocol = "http/1.x"
} else {
tlsVersion = tls.Version
tlsCipherSuite = tls.CipherSuite
}
}
if strings.HasPrefix(protocol, "http/1.") {
dlog.Warnf("[%s] does not support HTTP/2", name)
@ -865,13 +872,14 @@ func _fetchODoHTargetInfo(proxy *Proxy, name string, stamp stamps.ServerStamp, i
dlog.Infof(
"[%s] TLS version: %x - Protocol: %v - Cipher suite: %v",
name,
tls.Version,
tlsVersion,
protocol,
tls.CipherSuite,
tlsCipherSuite,
)
showCerts := proxy.showCerts
found := false
var wantedHash [32]byte
if tls != nil {
for _, cert := range tls.PeerCertificates {
h := sha256.Sum256(cert.RawTBSCertificate)
if showCerts {
@ -896,6 +904,7 @@ func _fetchODoHTargetInfo(proxy *Proxy, name string, stamp stamps.ServerStamp, i
dlog.Criticalf("[%s] Certificate hash [%x] not found", name, wantedHash)
return ServerInfo{}, fmt.Errorf("Certificate hash not found")
}
}
if len(serverResponse) < MinDNSPacketSize || len(serverResponse) > MaxDNSPacketSize ||
serverResponse[0] != 0xca || serverResponse[1] != 0xfe || serverResponse[4] != 0x00 || serverResponse[5] != 0x01 {
dlog.Info("Webserver returned an unexpected response")