87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
// Package fusefrontend interfaces directly with the go-fuse library.
|
|
package fusefrontend
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"strings"
|
|
"syscall"
|
|
|
|
"github.com/rfjakob/gocryptfs/internal/tlog"
|
|
)
|
|
|
|
// xattr names are encrypted like file names, but with a fixed IV.
|
|
// Padded with "_xx" for length 16.
|
|
var xattrNameIV = []byte("xattr_name_iv_xx")
|
|
|
|
// We store encrypted xattrs under this prefix plus the base64-encoded
|
|
// encrypted original name.
|
|
var xattrStorePrefix = "user.gocryptfs."
|
|
|
|
// GetXAttr - FUSE call. Reads the value of extended attribute "attr".
|
|
//
|
|
// This function is symlink-safe through Fgetxattr.
|
|
func (n *Node) Getxattr(ctx context.Context, attr string, dest []byte) (uint32, syscall.Errno) {
|
|
rn := n.rootNode()
|
|
cAttr := rn.encryptXattrName(attr)
|
|
cData, errno := n.getXAttr(cAttr)
|
|
if errno != 0 {
|
|
return 0, errno
|
|
}
|
|
data, err := rn.decryptXattrValue(cData)
|
|
if err != nil {
|
|
tlog.Warn.Printf("GetXAttr: %v", err)
|
|
return ^uint32(0), syscall.EIO
|
|
}
|
|
l := copy(dest, data)
|
|
return uint32(l), 0
|
|
}
|
|
|
|
// SetXAttr - FUSE call. Set extended attribute.
|
|
//
|
|
// This function is symlink-safe through Fsetxattr.
|
|
func (n *Node) Setxattr(ctx context.Context, attr string, data []byte, flags uint32) syscall.Errno {
|
|
rn := n.rootNode()
|
|
flags = uint32(filterXattrSetFlags(int(flags)))
|
|
cAttr := rn.encryptXattrName(attr)
|
|
cData := rn.encryptXattrValue(data)
|
|
return n.setXAttr(cAttr, cData, flags)
|
|
}
|
|
|
|
// RemoveXAttr - FUSE call.
|
|
//
|
|
// This function is symlink-safe through Fremovexattr.
|
|
func (n *Node) Removexattr(ctx context.Context, attr string) syscall.Errno {
|
|
rn := n.rootNode()
|
|
cAttr := rn.encryptXattrName(attr)
|
|
return n.removeXAttr(cAttr)
|
|
}
|
|
|
|
// ListXAttr - FUSE call. Lists extended attributes on the file at "relPath".
|
|
//
|
|
// This function is symlink-safe through Flistxattr.
|
|
func (n *Node) Listxattr(ctx context.Context, dest []byte) (uint32, syscall.Errno) {
|
|
cNames, errno := n.listXAttr()
|
|
if errno != 0 {
|
|
return 0, errno
|
|
}
|
|
rn := n.rootNode()
|
|
var buf bytes.Buffer
|
|
for _, curName := range cNames {
|
|
if !strings.HasPrefix(curName, xattrStorePrefix) {
|
|
continue
|
|
}
|
|
name, err := rn.decryptXattrName(curName)
|
|
if err != nil {
|
|
tlog.Warn.Printf("ListXAttr: invalid xattr name %q: %v", curName, err)
|
|
rn.reportMitigatedCorruption(curName)
|
|
continue
|
|
}
|
|
buf.WriteString(name + "\000")
|
|
}
|
|
if buf.Len() > len(dest) {
|
|
return ^uint32(0), syscall.ERANGE
|
|
}
|
|
return uint32(copy(dest, buf.Bytes())), 0
|
|
}
|