From 777b95f82ffea8a25b95089343b07b29378110da Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 26 Jul 2020 18:35:12 +0200
Subject: v2api: delete (most) fusefrontend v1 files

All the functionality in these files has been reimplemented
for the v2 api. Drop the old files.
---
 internal/fusefrontend/xattr.go | 140 -----------------------------------------
 1 file changed, 140 deletions(-)
 delete mode 100644 internal/fusefrontend/xattr.go

(limited to 'internal/fusefrontend/xattr.go')

diff --git a/internal/fusefrontend/xattr.go b/internal/fusefrontend/xattr.go
deleted file mode 100644
index 6638d83..0000000
--- a/internal/fusefrontend/xattr.go
+++ /dev/null
@@ -1,140 +0,0 @@
-// Package fusefrontend interfaces directly with the go-fuse library.
-package fusefrontend
-
-import (
-	"strings"
-	"syscall"
-
-	"github.com/hanwen/go-fuse/v2/fuse"
-
-	"github.com/rfjakob/gocryptfs/internal/tlog"
-)
-
-const _EOPNOTSUPP = fuse.Status(syscall.EOPNOTSUPP)
-
-// GetXAttr - FUSE call. Reads the value of extended attribute "attr".
-//
-// This function is symlink-safe through Fgetxattr.
-func (fs *FS) GetXAttr(relPath string, attr string, context *fuse.Context) ([]byte, fuse.Status) {
-	if fs.isFiltered(relPath) {
-		return nil, fuse.EPERM
-	}
-	cAttr := fs.encryptXattrName(attr)
-
-	cData, status := fs.getXAttr(relPath, cAttr, context)
-	if !status.Ok() {
-		return nil, status
-	}
-
-	data, err := fs.decryptXattrValue(cData)
-	if err != nil {
-		tlog.Warn.Printf("GetXAttr: %v", err)
-		return nil, fuse.EIO
-	}
-	return data, fuse.OK
-}
-
-// SetXAttr - FUSE call. Set extended attribute.
-//
-// This function is symlink-safe through Fsetxattr.
-func (fs *FS) SetXAttr(relPath string, attr string, data []byte, flags int, context *fuse.Context) fuse.Status {
-	if fs.isFiltered(relPath) {
-		return fuse.EPERM
-	}
-	flags = filterXattrSetFlags(flags)
-	cAttr := fs.encryptXattrName(attr)
-	cData := fs.encryptXattrValue(data)
-	return fs.setXAttr(relPath, cAttr, cData, flags, context)
-}
-
-// RemoveXAttr - FUSE call.
-//
-// This function is symlink-safe through Fremovexattr.
-func (fs *FS) RemoveXAttr(relPath string, attr string, context *fuse.Context) fuse.Status {
-	if fs.isFiltered(relPath) {
-		return fuse.EPERM
-	}
-	cAttr := fs.encryptXattrName(attr)
-	return fs.removeXAttr(relPath, cAttr, context)
-}
-
-// ListXAttr - FUSE call. Lists extended attributes on the file at "relPath".
-//
-// This function is symlink-safe through Flistxattr.
-func (fs *FS) ListXAttr(relPath string, context *fuse.Context) ([]string, fuse.Status) {
-	if fs.isFiltered(relPath) {
-		return nil, fuse.EPERM
-	}
-
-	cNames, status := fs.listXAttr(relPath, context)
-	if !status.Ok() {
-		return nil, status
-	}
-
-	names := make([]string, 0, len(cNames))
-	for _, curName := range cNames {
-		if !strings.HasPrefix(curName, xattrStorePrefix) {
-			continue
-		}
-		name, err := fs.decryptXattrName(curName)
-		if err != nil {
-			tlog.Warn.Printf("ListXAttr: invalid xattr name %q: %v", curName, err)
-			fs.reportMitigatedCorruption(curName)
-			continue
-		}
-		names = append(names, name)
-	}
-	return names, fuse.OK
-}
-
-// encryptXattrName transforms "user.foo" to "user.gocryptfs.a5sAd4XAa47f5as6dAf"
-func (fs *FS) encryptXattrName(attr string) (cAttr string) {
-	// xattr names are encrypted like file names, but with a fixed IV.
-	cAttr = xattrStorePrefix + fs.nameTransform.EncryptName(attr, xattrNameIV)
-	return cAttr
-}
-
-func (fs *FS) decryptXattrName(cAttr string) (attr string, err error) {
-	// Reject anything that does not start with "user.gocryptfs."
-	if !strings.HasPrefix(cAttr, xattrStorePrefix) {
-		return "", syscall.EINVAL
-	}
-	// Strip "user.gocryptfs." prefix
-	cAttr = cAttr[len(xattrStorePrefix):]
-	attr, err = fs.nameTransform.DecryptName(cAttr, xattrNameIV)
-	if err != nil {
-		return "", err
-	}
-	return attr, nil
-}
-
-// encryptXattrValue encrypts the xattr value "data".
-// The data is encrypted like a file content block, but without binding it to
-// a file location (block number and file id are set to zero).
-// Special case: an empty value is encrypted to an empty value.
-func (fs *FS) encryptXattrValue(data []byte) (cData []byte) {
-	if len(data) == 0 {
-		return []byte{}
-	}
-	return fs.contentEnc.EncryptBlock(data, 0, nil)
-}
-
-// decryptXattrValue decrypts the xattr value "cData".
-func (fs *FS) decryptXattrValue(cData []byte) (data []byte, err error) {
-	if len(cData) == 0 {
-		return []byte{}, nil
-	}
-	data, err1 := fs.contentEnc.DecryptBlock([]byte(cData), 0, nil)
-	if err1 == nil {
-		return data, nil
-	}
-	// This backward compatibility is needed to support old
-	// file systems having xattr values base64-encoded.
-	cData, err2 := fs.nameTransform.B64DecodeString(string(cData))
-	if err2 != nil {
-		// Looks like the value was not base64-encoded, but just corrupt.
-		// Return the original decryption error: err1
-		return nil, err1
-	}
-	return fs.contentEnc.DecryptBlock([]byte(cData), 0, nil)
-}
-- 
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