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Add gross DoH padding since nobody could help with #58

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This commit is contained in:
Frank Denis 2018-02-27 09:30:09 +01:00
parent 519af2e532
commit 0dfd4b70fc
1 changed files with 20 additions and 5 deletions
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25
dnscrypt-proxy/xtransport.go
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@ -84,7 +84,7 @@ func (xTransport *XTransport) rebuildTransport() {
xTransport.transport = transport
}
func (xTransport *XTransport) Fetch(method string, url *url.URL, accept string, contentType string, body *io.ReadCloser, timeout time.Duration) (*http.Response, time.Duration, error) {
func (xTransport *XTransport) Fetch(method string, url *url.URL, accept string, contentType string, body *io.ReadCloser, timeout time.Duration, padding *string) (*http.Response, time.Duration, error) {
if timeout <= 0 {
timeout = xTransport.timeout
}
@ -96,6 +96,9 @@ func (xTransport *XTransport) Fetch(method string, url *url.URL, accept string,
if len(contentType) > 0 {
header["Content-Type"] = []string{contentType}
}
if padding != nil {
header["X-Pad"] = []string{*padding}
}
req := &http.Request{
Method: method,
URL: url,
@ -184,14 +187,17 @@ func (xTransport *XTransport) Fetch(method string, url *url.URL, accept string,
}
func (xTransport *XTransport) Get(url *url.URL, accept string, timeout time.Duration) (*http.Response, time.Duration, error) {
return xTransport.Fetch("GET", url, "", "", nil, timeout)
return xTransport.Fetch("GET", url, "", "", nil, timeout, nil)
}
func (xTransport *XTransport) Post(url *url.URL, accept string, contentType string, body []byte, timeout time.Duration) (*http.Response, time.Duration, error) {
func (xTransport *XTransport) Post(url *url.URL, accept string, contentType string, body []byte, timeout time.Duration, padding *string) (*http.Response, time.Duration, error) {
bc := ioutil.NopCloser(bytes.NewReader(body))
return xTransport.Fetch("POST", url, accept, contentType, &bc, timeout)
return xTransport.Fetch("POST", url, accept, contentType, &bc, timeout, padding)
}
func (xTransport *XTransport) DoHQuery(useGet bool, url *url.URL, body []byte, timeout time.Duration) (*http.Response, time.Duration, error) {
padLen := 63 - (len(body)+63)&63
padding := xTransport.makePad(padLen)
dataType := "application/dns-udpwireformat"
if useGet {
qs := url.Query()
@ -199,9 +205,18 @@ func (xTransport *XTransport) DoHQuery(useGet bool, url *url.URL, body []byte, t
encBody := base64.RawURLEncoding.EncodeToString(body)
qs.Add("body", encBody)
qs.Add("dns", encBody)
qs.Add("random_padding", *padding)
url2 := *url
url2.RawQuery = qs.Encode()
return xTransport.Get(&url2, dataType, timeout)
}
return xTransport.Post(url, dataType, dataType, body, timeout)
return xTransport.Post(url, dataType, dataType, body, timeout, padding)
}
func (xTransport *XTransport) makePad(padLen int) *string {
if padLen <= 0 {
return nil
}
padding := strings.Repeat("X", padLen)
return &padding
}