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121 lines
3 KiB
Go
121 lines
3 KiB
Go
// +build !windows
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package hack
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import "net"
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// MalformedHostHeaderOverride is a wrapper to be able
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// to overcome the 400 Bad request coming from old docker
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// clients that send an invalid Host header.
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type MalformedHostHeaderOverride struct {
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net.Listener
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}
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// MalformedHostHeaderOverrideConn wraps the underlying unix
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// connection and keeps track of the first read from http.Server
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// which just reads the headers.
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type MalformedHostHeaderOverrideConn struct {
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net.Conn
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first bool
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}
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var closeConnHeader = []byte("\r\nConnection: close\r")
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// Read reads the first *read* request from http.Server to inspect
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// the Host header. If the Host starts with / then we're talking to
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// an old docker client which send an invalid Host header. To not
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// error out in http.Server we rewrite the first bytes of the request
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// to sanitize the Host header itself.
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// In case we're not dealing with old docker clients the data is just passed
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// to the server w/o modification.
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func (l *MalformedHostHeaderOverrideConn) Read(b []byte) (n int, err error) {
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// http.Server uses a 4k buffer
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if l.first && len(b) == 4096 {
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// This keeps track of the first read from http.Server which just reads
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// the headers
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l.first = false
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// The first read of the connection by http.Server is done limited to
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// DefaultMaxHeaderBytes (usually 1 << 20) + 4096.
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// Here we do the first read which gets us all the http headers to
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// be inspected and modified below.
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c, err := l.Conn.Read(b)
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if err != nil {
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return c, err
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}
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var (
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start, end int
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firstLineFeed = -1
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buf []byte
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)
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for i := 0; i <= c-1-7; i++ {
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if b[i] == '\n' && firstLineFeed == -1 {
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firstLineFeed = i
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}
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if b[i] != '\n' {
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continue
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}
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if b[i+1] == '\r' && b[i+2] == '\n' {
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return c, nil
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}
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if b[i+1] != 'H' {
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continue
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}
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if b[i+2] != 'o' {
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continue
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}
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if b[i+3] != 's' {
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continue
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}
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if b[i+4] != 't' {
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continue
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}
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if b[i+5] != ':' {
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continue
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}
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if b[i+6] != ' ' {
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continue
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}
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if b[i+7] != '/' {
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continue
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}
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// ensure clients other than the docker clients do not get this hack
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if i != firstLineFeed {
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return c, nil
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}
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start = i + 7
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// now find where the value ends
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for ii, bbb := range b[start:c] {
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if bbb == '\n' {
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end = start + ii
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break
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}
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}
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buf = make([]byte, 0, c+len(closeConnHeader)-(end-start))
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// strip the value of the host header and
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// inject `Connection: close` to ensure we don't reuse this connection
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buf = append(buf, b[:start]...)
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buf = append(buf, closeConnHeader...)
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buf = append(buf, b[end:c]...)
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copy(b, buf)
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break
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}
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if len(buf) == 0 {
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return c, nil
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}
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return len(buf), nil
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}
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return l.Conn.Read(b)
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}
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// Accept makes the listener accepts connections and wraps the connection
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// in a MalformedHostHeaderOverrideConn initilizing first to true.
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func (l *MalformedHostHeaderOverride) Accept() (net.Conn, error) {
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c, err := l.Listener.Accept()
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if err != nil {
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return c, err
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}
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return &MalformedHostHeaderOverrideConn{c, true}, nil
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}
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