mirror of
https://github.com/cloudflare/cloudflared.git
synced 2025-07-27 00:09:57 +00:00
TUN-2717: Function to serialize/deserialize HTTP headers
This commit is contained in:
Areg Harutyunyan
@@ -90,10 +90,6 @@ type Muxer struct {
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compressionQuality CompressionPreset
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}
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type Header struct {
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Name, Value string
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}
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func RPCHeaders() []Header {
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return []Header{
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{Name: ":method", Value: "RPC"},
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143
h2mux/header.go
Normal file
143
h2mux/header.go
Normal file
@@ -0,0 +1,143 @@
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package h2mux
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"github.com/pkg/errors"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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)
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type Header struct {
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Name, Value string
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}
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var headerEncoding = base64.RawStdEncoding
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// H2RequestHeadersToH1Request converts the HTTP/2 headers to an HTTP/1 Request
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// object. This includes conversion of the pseudo-headers into their closest
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// HTTP/1 equivalents. See https://tools.ietf.org/html/rfc7540#section-8.1.2.3
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func H2RequestHeadersToH1Request(h2 []Header, h1 *http.Request) error {
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for _, header := range h2 {
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switch header.Name {
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case ":method":
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h1.Method = header.Value
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case ":scheme":
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// noop - use the preexisting scheme from h1.URL
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case ":authority":
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// Otherwise the host header will be based on the origin URL
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h1.Host = header.Value
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case ":path":
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// We don't want to be an "opinionated" proxy, so ideally we would use :path as-is.
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// However, this HTTP/1 Request object belongs to the Go standard library,
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// whose URL package makes some opinionated decisions about the encoding of
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// URL characters: see the docs of https://godoc.org/net/url#URL,
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// in particular the EscapedPath method https://godoc.org/net/url#URL.EscapedPath,
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// which is always used when computing url.URL.String(), whether we'd like it or not.
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//
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// Well, not *always*. We could circumvent this by using url.URL.Opaque. But
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// that would present unusual difficulties when using an HTTP proxy: url.URL.Opaque
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// is treated differently when HTTP_PROXY is set!
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// See https://github.com/golang/go/issues/5684#issuecomment-66080888
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//
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// This means we are subject to the behavior of net/url's function `shouldEscape`
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// (as invoked with mode=encodePath): https://github.com/golang/go/blob/go1.12.7/src/net/url/url.go#L101
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if header.Value == "*" {
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h1.URL.Path = "*"
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continue
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}
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// Due to the behavior of validation.ValidateUrl, h1.URL may
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// already have a partial value, with or without a trailing slash.
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base := h1.URL.String()
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base = strings.TrimRight(base, "/")
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// But we know :path begins with '/', because we handled '*' above - see RFC7540
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url, err := url.Parse(base + header.Value)
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if err != nil {
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return errors.Wrap(err, fmt.Sprintf("invalid path '%v'", header.Value))
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}
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h1.URL = url
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case "content-length":
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contentLength, err := strconv.ParseInt(header.Value, 10, 64)
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if err != nil {
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return fmt.Errorf("unparseable content length")
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}
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h1.ContentLength = contentLength
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default:
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h1.Header.Add(http.CanonicalHeaderKey(header.Name), header.Value)
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}
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}
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return nil
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}
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func H1ResponseToH2ResponseHeaders(h1 *http.Response) (h2 []Header) {
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h2 = []Header{{Name: ":status", Value: fmt.Sprintf("%d", h1.StatusCode)}}
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for headerName, headerValues := range h1.Header {
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for _, headerValue := range headerValues {
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h2 = append(h2, Header{Name: strings.ToLower(headerName), Value: headerValue})
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}
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}
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return h2
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}
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// Serialize HTTP1.x headers by base64-encoding each header name and value,
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// and then joining them in the format of [key:value;]
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func SerializeHeaders(h1 *http.Request) []byte {
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var serializedHeaders [][]byte
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for headerName, headerValues := range h1.Header {
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for _, headerValue := range headerValues {
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encodedName := make([]byte, headerEncoding.EncodedLen(len(headerName)))
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headerEncoding.Encode(encodedName, []byte(headerName))
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encodedValue := make([]byte, headerEncoding.EncodedLen(len(headerValue)))
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headerEncoding.Encode(encodedValue, []byte(headerValue))
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serializedHeaders = append(
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serializedHeaders,
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bytes.Join(
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[][]byte{encodedName, encodedValue},
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[]byte(":"),
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),
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)
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}
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}
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return bytes.Join(serializedHeaders, []byte(";"))
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}
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// Deserialize headers serialized by `SerializeHeader`
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func DeserializeHeaders(serializedHeaders []byte) (http.Header, error) {
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const unableToDeserializeErr = "Unable to deserialize headers"
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deserialized := http.Header{}
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for _, serializedPair := range bytes.Split(serializedHeaders, []byte(";")) {
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if len(serializedPair) == 0 {
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continue
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}
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serializedHeaderParts := bytes.Split(serializedPair, []byte(":"))
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if len(serializedHeaderParts) != 2 {
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return nil, errors.New(unableToDeserializeErr)
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}
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serializedName := serializedHeaderParts[0]
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serializedValue := serializedHeaderParts[1]
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deserializedName := make([]byte, headerEncoding.DecodedLen(len(serializedName)))
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deserializedValue := make([]byte, headerEncoding.DecodedLen(len(serializedValue)))
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if _, err := headerEncoding.Decode(deserializedName, serializedName); err != nil {
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return nil, errors.Wrap(err, unableToDeserializeErr)
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}
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if _, err := headerEncoding.Decode(deserializedValue, serializedValue); err != nil {
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return nil, errors.Wrap(err, unableToDeserializeErr)
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}
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deserialized.Add(string(deserializedName), string(deserializedValue))
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}
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return deserialized, nil
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}
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508
h2mux/header_test.go
Normal file
508
h2mux/header_test.go
Normal file
@@ -0,0 +1,508 @@
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package h2mux
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import (
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"fmt"
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"math/rand"
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"net/http"
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"net/url"
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"reflect"
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"regexp"
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"strings"
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"testing"
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"testing/quick"
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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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func TestH2RequestHeadersToH1Request_RegularHeaders(t *testing.T) {
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request, err := http.NewRequest(http.MethodGet, "http://example.com", nil)
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assert.NoError(t, err)
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headersConversionErr := H2RequestHeadersToH1Request(
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[]Header{
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{
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Name: "Mock header 1",
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Value: "Mock value 1",
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},
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{
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Name: "Mock header 2",
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Value: "Mock value 2",
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},
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},
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request,
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)
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assert.Equal(t, http.Header{
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"Mock header 1": []string{"Mock value 1"},
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"Mock header 2": []string{"Mock value 2"},
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}, request.Header)
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assert.NoError(t, headersConversionErr)
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}
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func TestH2RequestHeadersToH1Request_NoHeaders(t *testing.T) {
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request, err := http.NewRequest(http.MethodGet, "http://example.com", nil)
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assert.NoError(t, err)
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headersConversionErr := H2RequestHeadersToH1Request(
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[]Header{},
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request,
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)
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assert.Equal(t, http.Header{}, request.Header)
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assert.NoError(t, headersConversionErr)
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}
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func TestH2RequestHeadersToH1Request_InvalidHostPath(t *testing.T) {
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request, err := http.NewRequest(http.MethodGet, "http://example.com", nil)
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assert.NoError(t, err)
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headersConversionErr := H2RequestHeadersToH1Request(
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[]Header{
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{
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Name: ":path",
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Value: "//bad_path/",
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},
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{
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Name: "Mock header",
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Value: "Mock value",
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},
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},
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request,
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)
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assert.Equal(t, http.Header{
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"Mock header": []string{"Mock value"},
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}, request.Header)
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assert.Equal(t, "http://example.com//bad_path/", request.URL.String())
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assert.NoError(t, headersConversionErr)
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}
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func TestH2RequestHeadersToH1Request_HostPathWithQuery(t *testing.T) {
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request, err := http.NewRequest(http.MethodGet, "http://example.com/", nil)
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assert.NoError(t, err)
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headersConversionErr := H2RequestHeadersToH1Request(
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[]Header{
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{
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Name: ":path",
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Value: "/?query=mock%20value",
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},
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{
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Name: "Mock header",
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Value: "Mock value",
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},
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},
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request,
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)
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assert.Equal(t, http.Header{
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"Mock header": []string{"Mock value"},
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}, request.Header)
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assert.Equal(t, "http://example.com/?query=mock%20value", request.URL.String())
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assert.NoError(t, headersConversionErr)
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}
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func TestH2RequestHeadersToH1Request_HostPathWithURLEncoding(t *testing.T) {
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request, err := http.NewRequest(http.MethodGet, "http://example.com/", nil)
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assert.NoError(t, err)
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headersConversionErr := H2RequestHeadersToH1Request(
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[]Header{
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{
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Name: ":path",
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Value: "/mock%20path",
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},
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{
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Name: "Mock header",
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Value: "Mock value",
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},
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},
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request,
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)
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assert.Equal(t, http.Header{
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"Mock header": []string{"Mock value"},
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}, request.Header)
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assert.Equal(t, "http://example.com/mock%20path", request.URL.String())
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assert.NoError(t, headersConversionErr)
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}
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func TestH2RequestHeadersToH1Request_WeirdURLs(t *testing.T) {
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type testCase struct {
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path string
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want string
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}
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testCases := []testCase{
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{
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path: "",
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want: "",
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},
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{
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path: "/",
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want: "/",
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},
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{
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path: "//",
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want: "//",
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},
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{
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path: "/test",
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want: "/test",
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},
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{
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path: "//test",
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want: "//test",
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},
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{
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// https://github.com/cloudflare/cloudflared/issues/81
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path: "//test/",
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want: "//test/",
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},
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{
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path: "/%2Ftest",
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want: "/%2Ftest",
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},
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{
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path: "//%20test",
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want: "//%20test",
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},
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{
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// https://github.com/cloudflare/cloudflared/issues/124
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path: "/test?get=somthing%20a",
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want: "/test?get=somthing%20a",
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},
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{
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path: "/%20",
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want: "/%20",
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},
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{
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// stdlib's EscapedPath() will always percent-encode ' '
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path: "/ ",
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want: "/%20",
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},
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{
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path: "/ a ",
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want: "/%20a%20",
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},
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{
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path: "/a%20b",
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want: "/a%20b",
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},
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{
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path: "/foo/bar;param?query#frag",
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want: "/foo/bar;param?query#frag",
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},
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{
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// stdlib's EscapedPath() will always percent-encode non-ASCII chars
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path: "/a␠b",
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want: "/a%E2%90%A0b",
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},
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{
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path: "/a-umlaut-ä",
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want: "/a-umlaut-%C3%A4",
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},
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{
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path: "/a-umlaut-%C3%A4",
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want: "/a-umlaut-%C3%A4",
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},
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{
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path: "/a-umlaut-%c3%a4",
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want: "/a-umlaut-%c3%a4",
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},
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{
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// here the second '#' is treated as part of the fragment
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path: "/a#b#c",
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want: "/a#b%23c",
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},
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{
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path: "/a#b␠c",
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want: "/a#b%E2%90%A0c",
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},
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{
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path: "/a#b%20c",
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want: "/a#b%20c",
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},
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{
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path: "/a#b c",
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want: "/a#b%20c",
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},
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{
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// stdlib's EscapedPath() will always percent-encode '\'
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path: "/\\",
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want: "/%5C",
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},
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{
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path: "/a\\",
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want: "/a%5C",
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},
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{
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path: "/a,b.c.",
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want: "/a,b.c.",
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},
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{
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path: "/.",
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want: "/.",
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},
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{
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// stdlib's EscapedPath() will always percent-encode '`'
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path: "/a`",
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want: "/a%60",
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},
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{
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path: "/a[0]",
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want: "/a[0]",
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},
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{
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path: "/?a[0]=5 &b[]=",
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want: "/?a[0]=5 &b[]=",
|
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},
|
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{
|
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path: "/?a=%22b%20%22",
|
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want: "/?a=%22b%20%22",
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},
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}
|
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|
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for index, testCase := range testCases {
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requestURL := "https://example.com"
|
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|
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request, err := http.NewRequest(http.MethodGet, requestURL, nil)
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assert.NoError(t, err)
|
||||
headersConversionErr := H2RequestHeadersToH1Request(
|
||||
[]Header{
|
||||
{
|
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Name: ":path",
|
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Value: testCase.path,
|
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},
|
||||
{
|
||||
Name: "Mock header",
|
||||
Value: "Mock value",
|
||||
},
|
||||
},
|
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request,
|
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)
|
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assert.NoError(t, headersConversionErr)
|
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|
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assert.Equal(t,
|
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http.Header{
|
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"Mock header": []string{"Mock value"},
|
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},
|
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request.Header)
|
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|
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assert.Equal(t,
|
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"https://example.com"+testCase.want,
|
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request.URL.String(),
|
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"Failed URL index: %v %#v", index, testCase)
|
||||
}
|
||||
}
|
||||
|
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func TestH2RequestHeadersToH1Request_QuickCheck(t *testing.T) {
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config := &quick.Config{
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Values: func(args []reflect.Value, rand *rand.Rand) {
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args[0] = reflect.ValueOf(randomHTTP2Path(t, rand))
|
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},
|
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}
|
||||
|
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type testOrigin struct {
|
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url string
|
||||
|
||||
expectedScheme string
|
||||
expectedBasePath string
|
||||
}
|
||||
testOrigins := []testOrigin{
|
||||
{
|
||||
url: "http://origin.hostname.example.com:8080",
|
||||
expectedScheme: "http",
|
||||
expectedBasePath: "http://origin.hostname.example.com:8080",
|
||||
},
|
||||
{
|
||||
url: "http://origin.hostname.example.com:8080/",
|
||||
expectedScheme: "http",
|
||||
expectedBasePath: "http://origin.hostname.example.com:8080",
|
||||
},
|
||||
{
|
||||
url: "http://origin.hostname.example.com:8080/api",
|
||||
expectedScheme: "http",
|
||||
expectedBasePath: "http://origin.hostname.example.com:8080/api",
|
||||
},
|
||||
{
|
||||
url: "http://origin.hostname.example.com:8080/api/",
|
||||
expectedScheme: "http",
|
||||
expectedBasePath: "http://origin.hostname.example.com:8080/api",
|
||||
},
|
||||
{
|
||||
url: "https://origin.hostname.example.com:8080/api",
|
||||
expectedScheme: "https",
|
||||
expectedBasePath: "https://origin.hostname.example.com:8080/api",
|
||||
},
|
||||
}
|
||||
|
||||
// use multiple schemes to demonstrate that the URL is based on the
|
||||
// origin's scheme, not the :scheme header
|
||||
for _, testScheme := range []string{"http", "https"} {
|
||||
for _, testOrigin := range testOrigins {
|
||||
assertion := func(testPath string) bool {
|
||||
const expectedMethod = "POST"
|
||||
const expectedHostname = "request.hostname.example.com"
|
||||
|
||||
h2 := []Header{
|
||||
{Name: ":method", Value: expectedMethod},
|
||||
{Name: ":scheme", Value: testScheme},
|
||||
{Name: ":authority", Value: expectedHostname},
|
||||
{Name: ":path", Value: testPath},
|
||||
}
|
||||
h1, err := http.NewRequest("GET", testOrigin.url, nil)
|
||||
require.NoError(t, err)
|
||||
|
||||
err = H2RequestHeadersToH1Request(h2, h1)
|
||||
return assert.NoError(t, err) &&
|
||||
assert.Equal(t, expectedMethod, h1.Method) &&
|
||||
assert.Equal(t, expectedHostname, h1.Host) &&
|
||||
assert.Equal(t, testOrigin.expectedScheme, h1.URL.Scheme) &&
|
||||
assert.Equal(t, testOrigin.expectedBasePath+testPath, h1.URL.String())
|
||||
}
|
||||
err := quick.Check(assertion, config)
|
||||
assert.NoError(t, err)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func randomASCIIPrintableChar(rand *rand.Rand) int {
|
||||
// smallest printable ASCII char is 32, largest is 126
|
||||
const startPrintable = 32
|
||||
const endPrintable = 127
|
||||
return startPrintable + rand.Intn(endPrintable-startPrintable)
|
||||
}
|
||||
|
||||
// randomASCIIText generates an ASCII string, some of whose characters may be
|
||||
// percent-encoded. Its "logical length" (ignoring percent-encoding) is
|
||||
// between 1 and `maxLength`.
|
||||
func randomASCIIText(rand *rand.Rand, minLength int, maxLength int) string {
|
||||
length := minLength + rand.Intn(maxLength)
|
||||
result := ""
|
||||
for i := 0; i < length; i++ {
|
||||
c := randomASCIIPrintableChar(rand)
|
||||
|
||||
// 1/4 chance of using percent encoding when not necessary
|
||||
if c == '%' || rand.Intn(4) == 0 {
|
||||
result += fmt.Sprintf("%%%02X", c)
|
||||
} else {
|
||||
result += string(c)
|
||||
}
|
||||
}
|
||||
return result
|
||||
}
|
||||
|
||||
// Calls `randomASCIIText` and ensures the result is a valid URL path,
|
||||
// i.e. one that can pass unchanged through url.URL.String()
|
||||
func randomHTTP1Path(t *testing.T, rand *rand.Rand, minLength int, maxLength int) string {
|
||||
text := randomASCIIText(rand, minLength, maxLength)
|
||||
re, err := regexp.Compile("[^/;,]*")
|
||||
require.NoError(t, err)
|
||||
return "/" + re.ReplaceAllStringFunc(text, url.PathEscape)
|
||||
}
|
||||
|
||||
// Calls `randomASCIIText` and ensures the result is a valid URL query,
|
||||
// i.e. one that can pass unchanged through url.URL.String()
|
||||
func randomHTTP1Query(rand *rand.Rand, minLength int, maxLength int) string {
|
||||
text := randomASCIIText(rand, minLength, maxLength)
|
||||
return "?" + strings.ReplaceAll(text, "#", "%23")
|
||||
}
|
||||
|
||||
// Calls `randomASCIIText` and ensures the result is a valid URL fragment,
|
||||
// i.e. one that can pass unchanged through url.URL.String()
|
||||
func randomHTTP1Fragment(t *testing.T, rand *rand.Rand, minLength int, maxLength int) string {
|
||||
text := randomASCIIText(rand, minLength, maxLength)
|
||||
u, err := url.Parse("#" + text)
|
||||
require.NoError(t, err)
|
||||
return u.String()
|
||||
}
|
||||
|
||||
// Assemble a random :path pseudoheader that is legal by Go stdlib standards
|
||||
// (i.e. all characters will satisfy "net/url".shouldEscape for their respective locations)
|
||||
func randomHTTP2Path(t *testing.T, rand *rand.Rand) string {
|
||||
result := randomHTTP1Path(t, rand, 1, 64)
|
||||
if rand.Intn(2) == 1 {
|
||||
result += randomHTTP1Query(rand, 1, 32)
|
||||
}
|
||||
if rand.Intn(2) == 1 {
|
||||
result += randomHTTP1Fragment(t, rand, 1, 16)
|
||||
}
|
||||
return result
|
||||
}
|
||||
|
||||
func TestSerializeHeaders(t *testing.T) {
|
||||
request, err := http.NewRequest(http.MethodGet, "http://example.com", nil)
|
||||
assert.NoError(t, err)
|
||||
|
||||
mockHeaders := map[string][]string{
|
||||
"Mock-Header-One": {"Mock header one value", "three"},
|
||||
"Mock-Header-Two-Long": {"Mock header two value\nlong"},
|
||||
":;": {":;", ";:"},
|
||||
":": {":"},
|
||||
";": {";"},
|
||||
";;": {";;"},
|
||||
"Empty values": {"", ""},
|
||||
"": {"Empty key"},
|
||||
"control\tcharacter\b\n": {"value\n\b\t"},
|
||||
";\v:": {":\v;"},
|
||||
}
|
||||
|
||||
for header, values := range mockHeaders {
|
||||
for _, value := range values {
|
||||
// Note that Golang's http library is opinionated;
|
||||
// at this point every header name will be title-cased in order to comply with the HTTP RFC
|
||||
// This means our proxy is not completely transparent when it comes to proxying headers
|
||||
request.Header.Add(header, value)
|
||||
}
|
||||
}
|
||||
|
||||
serializedHeaders := SerializeHeaders(request)
|
||||
|
||||
// Sanity check: the headers serialized to something that's not an empty string
|
||||
assert.NotEqual(t, "", serializedHeaders)
|
||||
|
||||
// Deserialize back, and ensure we get the same set of headers
|
||||
deserializedHeaders, err := DeserializeHeaders(serializedHeaders)
|
||||
assert.NoError(t, err)
|
||||
|
||||
assert.Equal(t, len(mockHeaders), len(deserializedHeaders))
|
||||
for header, value := range deserializedHeaders {
|
||||
assert.NotEqual(t, "", value)
|
||||
assert.Equal(t, mockHeaders[header], value)
|
||||
}
|
||||
}
|
||||
|
||||
func TestSerializeNoHeaders(t *testing.T) {
|
||||
request, err := http.NewRequest(http.MethodGet, "http://example.com", nil)
|
||||
assert.NoError(t, err)
|
||||
|
||||
serializedHeaders := SerializeHeaders(request)
|
||||
deserializedHeaders, err := DeserializeHeaders(serializedHeaders)
|
||||
assert.NoError(t, err)
|
||||
assert.Equal(t, 0, len(deserializedHeaders))
|
||||
}
|
||||
|
||||
func TestDeserializeMalformed(t *testing.T) {
|
||||
var err error
|
||||
|
||||
malformedData := []string{
|
||||
"malformed data",
|
||||
"bW9jawo=", // "mock"
|
||||
"bW9jawo=:ZGF0YQo=:bW9jawo=", // "mock:data:mock"
|
||||
"::",
|
||||
}
|
||||
|
||||
for _, malformedValue := range malformedData {
|
||||
_, err = DeserializeHeaders([]byte(malformedValue))
|
||||
assert.Error(t, err)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user