compat handlers: add X-Registry-Auth header support

* Support the `X-Registry-Auth` http-request header.

 * The content of the header is a base64 encoded JSON payload which can
   either be a single auth config or a map of auth configs (user+pw or
   token) with the corresponding registries being the keys.  Vanilla
   Docker, projectatomic Docker and the bindings are transparantly
   supported.

 * Add a hidden `--registries-conf` flag.  Buildah exposes the same
   flag, mostly for testing purposes.

 * Do all credential parsing in the client (i.e., `cmd/podman`) pass
   the username and password in the backend instead of unparsed
   credentials.

 * Add a `pkg/auth` which handles most of the heavy lifting.

 * Go through the authentication-handling code of most commands, bindings
   and endpoints.  Migrate them to the new code and fix issues as seen.
   A final evaluation and more tests is still required *after* this
   change.

 * The manifest-push endpoint is missing certain parameters and should
   use the ABI function instead.  Adding auth-support isn't really
   possible without these parts working.

 * The container commands and endpoints (i.e., create and run) have not
   been changed yet.  The APIs don't yet account for the authfile.

 * Add authentication tests to `pkg/bindings`.

Fixes: #6384
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/klauspost/compress/zstd/blockdec.go

@@ -156,8 +156,12 @@ func (b *blockDec) reset(br byteBuffer, windowSize uint64) error {
 			}
 			return ErrCompressedSizeTooBig
 		}
-	default:
+	case blockTypeRaw:
 		b.RLESize = 0
+		// We do not need a destination for raw blocks.
+		maxSize = -1
+	default:
+		panic("Invalid block type")
 	}
 
 	// Read block data.

vendor/github.com/klauspost/compress/zstd/decoder.go

@@ -461,6 +461,7 @@ func (d *Decoder) startStreamDecoder(inStream chan decodeStream) {
 		br := readerWrapper{r: stream.r}
 	decodeStream:
 		for {
+			frame.history.reset()
 			err := frame.reset(&br)
 			if debug && err != nil {
 				println("Frame decoder returned", err)

vendor/github.com/klauspost/compress/zstd/seqdec.go

@@ -64,6 +64,7 @@ type sequenceDecs struct {
 	hist         []byte
 	literals     []byte
 	out          []byte
+	windowSize   int
 	maxBits      uint8
 }
 
@@ -82,6 +83,7 @@ func (s *sequenceDecs) initialize(br *bitReader, hist *history, literals, out []
 	s.hist = hist.b
 	s.prevOffset = hist.recentOffsets
 	s.maxBits = s.litLengths.fse.maxBits + s.offsets.fse.maxBits + s.matchLengths.fse.maxBits
+	s.windowSize = hist.windowSize
 	s.out = out
 	return nil
 }
@@ -131,6 +133,9 @@ func (s *sequenceDecs) decode(seqs int, br *bitReader, hist []byte) error {
 		if matchOff > len(s.out)+len(hist)+litLen {
 			return fmt.Errorf("match offset (%d) bigger than current history (%d)", matchOff, len(s.out)+len(hist)+litLen)
 		}
+		if matchOff > s.windowSize {
+			return fmt.Errorf("match offset (%d) bigger than window size (%d)", matchOff, s.windowSize)
+		}
 		if matchOff == 0 && matchLen > 0 {
 			return fmt.Errorf("zero matchoff and matchlen > 0")
 		}