vendor: update github.com/pkg/sftp because dep insisted

Gopkg.lock

@@ -139,8 +139,14 @@
   packages = [
     "dropbox",
     "dropbox/async",
+    "dropbox/common",
     "dropbox/file_properties",
-    "dropbox/files"
+    "dropbox/files",
+    "dropbox/sharing",
+    "dropbox/team_common",
+    "dropbox/team_policies",
+    "dropbox/users",
+    "dropbox/users_common"
   ]
   revision = "f0b3f3ded6d415a94e83e9a514fb8025e4e6be31"
 
@@ -254,8 +260,8 @@
 [[projects]]
   name = "github.com/pkg/sftp"
   packages = ["."]
-  revision = "49488377fa2f14143ba3067cf7555f60f6c7b550"
-  version = "1.5.0"
+  revision = "43ec6c679d353f6e077d3965dc74f6d996eb4a09"
+  version = "1.5.1"
 
 [[projects]]
   name = "github.com/pmezard/go-difflib"
@@ -375,7 +381,8 @@
     "idna",
     "lex/httplex",
     "webdav",
-    "webdav/internal/xml"
+    "webdav/internal/xml",
+    "websocket"
   ]
   revision = "92b859f39abd2d91a854c9f9c4621b2f5054a92d"
 
@@ -468,6 +475,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "a91eff17e50d8733124875c68dbe771833cb9d8d07d545ba75fc4dd561f9bfe2"
+  inputs-digest = "50d82f1173802259032be4dddb962f1b7ed8eebdbc24c73febcde47d8deecb30"
   solver-name = "gps-cdcl"
   solver-version = 1

vendor/github.com/pkg/sftp/packet-typing.go

@@ -127,7 +127,9 @@ func makePacket(p rxPacket) (requestPacket, error) {
 		return nil, errors.Errorf("unhandled packet type: %s", p.pktType)
 	}
 	if err := pkt.UnmarshalBinary(p.pktBytes); err != nil {
-		return nil, err
+		// Return partially unpacked packet to allow callers to return
+		// error messages appropriately with necessary id() method.
+		return pkt, err
 	}
 	return pkt, nil
 }

vendor/github.com/pkg/sftp/packet.go

@@ -875,9 +875,17 @@ type sshFxpExtendedPacket struct {
 }
 
 func (p sshFxpExtendedPacket) id() uint32 { return p.ID }
-func (p sshFxpExtendedPacket) readonly() bool { return p.SpecificPacket.readonly() }
+func (p sshFxpExtendedPacket) readonly() bool {
+	if p.SpecificPacket == nil {
+		return true
+	}
+	return p.SpecificPacket.readonly()
+}
 
 func (p sshFxpExtendedPacket) respond(svr *Server) error {
+	if p.SpecificPacket == nil {
+		return nil
+	}
 	return p.SpecificPacket.respond(svr)
 }
 
@@ -897,7 +905,7 @@ func (p *sshFxpExtendedPacket) UnmarshalBinary(b []byte) error {
 	case "posix-rename@openssh.com":
 		p.SpecificPacket = &sshFxpExtendedPacketPosixRename{}
 	default:
-		return errUnknownExtendedPacket
+		return errors.Wrapf(errUnknownExtendedPacket, "packet type %v", p.SpecificPacket)
 	}
 
 	return p.SpecificPacket.UnmarshalBinary(bOrig)

vendor/github.com/pkg/sftp/request-server.go

@@ -128,10 +128,19 @@ func (rs *RequestServer) Serve() error {
 
 		pkt, err = makePacket(rxPacket{fxp(pktType), pktBytes})
 		if err != nil {
+			switch errors.Cause(err) {
+			case errUnknownExtendedPacket:
+				if err := rs.serverConn.sendError(pkt, ErrSshFxOpUnsupported); err != nil {
+					debug("failed to send err packet: %v", err)
+					rs.conn.Close() // shuts down recvPacket
+					break
+				}
+			default:
 				debug("makePacket err: %v", err)
 				rs.conn.Close() // shuts down recvPacket
 				break
 			}
+		}
 
 		pktChan <- pkt
 	}

vendor/github.com/pkg/sftp/request.go

@@ -152,9 +152,6 @@ func (r *Request) getLister() ListerAt {
 
 // Close reader/writer if possible
 func (r *Request) close() error {
-	if r.cancelCtx != nil {
-		r.cancelCtx()
-	}
 	rd := r.getReader()
 	if c, ok := rd.(io.Closer); ok {
 		return c.Close()
@@ -163,6 +160,9 @@ func (r *Request) close() error {
 	if c, ok := wt.(io.Closer); ok {
 		return c.Close()
 	}
+	if r.cancelCtx != nil {
+		r.cancelCtx()
+	}
 	return nil
 }
 

vendor/github.com/pkg/sftp/server.go

@@ -134,7 +134,7 @@ func (svr *Server) sftpServerWorker(pktChan chan requestPacket) error {
 		case *sshFxpOpenPacket:
 			readonly = pkt.readonly()
 		case *sshFxpExtendedPacket:
-			readonly = pkt.SpecificPacket.readonly()
+			readonly = pkt.readonly()
 		}
 
 		// If server is operating read-only and a write operation is requested,
@@ -304,10 +304,19 @@ func (svr *Server) Serve() error {
 
 		pkt, err = makePacket(rxPacket{fxp(pktType), pktBytes})
 		if err != nil {
+			switch errors.Cause(err) {
+			case errUnknownExtendedPacket:
+				if err := svr.serverConn.sendError(pkt, ErrSshFxOpUnsupported); err != nil {
+					debug("failed to send err packet: %v", err)
+					svr.conn.Close() // shuts down recvPacket
+					break
+				}
+			default:
 				debug("makePacket err: %v", err)
 				svr.conn.Close() // shuts down recvPacket
 				break
 			}
+		}
 
 		pktChan <- pkt
 	}

vendor/github.com/pkg/sftp/server_test.go

@@ -198,24 +198,29 @@ func (p sshFxpTestBadExtendedPacket) MarshalBinary() ([]byte, error) {
 }
 
 // test that errors are sent back when we request an invalid extended packet operation
+// this validates the following rfc draft is followed https://tools.ietf.org/html/draft-ietf-secsh-filexfer-extensions-00
 func TestInvalidExtendedPacket(t *testing.T) {
 	client, server := clientServerPair(t)
 	defer client.Close()
 	defer server.Close()
 
 	badPacket := sshFxpTestBadExtendedPacket{client.nextID(), "thisDoesn'tExist", "foobar"}
-	_, _, err := client.clientConn.sendPacket(badPacket)
-	if err == nil {
-		t.Fatal("expected error from bad packet")
+	typ, data, err := client.clientConn.sendPacket(badPacket)
+	if err != nil {
+		t.Fatalf("unexpected error from sendPacket: %s", err)
+	}
+	if typ != ssh_FXP_STATUS {
+		t.Fatalf("received non-FPX_STATUS packet: %v", typ)
 	}
 
-	// try to stat a file; the client should have shut down.
-	filePath := "/etc/passwd"
-	_, err = client.Stat(filePath)
-	if err == nil {
-		t.Fatal("expected error from closed connection")
+	err = unmarshalStatus(badPacket.id(), data)
+	statusErr, ok := err.(*StatusError)
+	if !ok {
+		t.Fatal("failed to convert error from unmarshalStatus to *StatusError")
+	}
+	if statusErr.Code != ssh_FX_OP_UNSUPPORTED {
+		t.Errorf("statusErr.Code => %d, wanted %d", statusErr.Code, ssh_FX_OP_UNSUPPORTED)
 	}
-
 }
 
 // test that server handles concurrent requests correctly