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package nametransform
import (
"crypto/sha256"
"io/ioutil"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/rfjakob/gocryptfs/internal/syscallcompat"
"github.com/rfjakob/gocryptfs/internal/tlog"
)
const (
// LongNameSuffix is the suffix used for files with long names.
// Files with long names are stored in two files:
// gocryptfs.longname.[sha256] <--- File content, prefix = gocryptfs.longname.
// gocryptfs.longname.[sha256].name <--- File name, suffix = .name
LongNameSuffix = ".name"
longNamePrefix = "gocryptfs.longname."
)
// HashLongName - take the hash of a long string "name" and return
// "gocryptfs.longname.[sha256]"
func (n *NameTransform) HashLongName(name string) string {
hashBin := sha256.Sum256([]byte(name))
hashBase64 := n.b64.EncodeToString(hashBin[:])
return longNamePrefix + hashBase64
}
// Values returned by IsLongName
const (
// LongNameContent is the file that stores the file content.
// Example: gocryptfs.longname.URrM8kgxTKYMgCk4hKk7RO9Lcfr30XQof4L_5bD9Iro=
LongNameContent = iota
// LongNameFilename is the file that stores the full encrypted filename.
// Example: gocryptfs.longname.URrM8kgxTKYMgCk4hKk7RO9Lcfr30XQof4L_5bD9Iro=.name
LongNameFilename = iota
// LongNameNone is used when the file does not have a long name.
// Example: i1bpTaVLZq7sRNA9mL_2Ig==
LongNameNone = iota
)
// NameType - detect if cName is
// gocryptfs.longname.[sha256] ........ LongNameContent (content of a long name file)
// gocryptfs.longname.[sha256].name .... LongNameFilename (full file name of a long name file)
// else ................................ LongNameNone (normal file)
func NameType(cName string) int {
if !strings.HasPrefix(cName, longNamePrefix) {
return LongNameNone
}
if strings.HasSuffix(cName, LongNameSuffix) {
return LongNameFilename
}
return LongNameContent
}
// IsLongContent returns true if "cName" is the content store of a long name
// file (looks like "gocryptfs.longname.[sha256]").
func IsLongContent(cName string) bool {
return NameType(cName) == LongNameContent
}
// ReadLongName - read path.name
func ReadLongName(path string) (string, error) {
content, err := ioutil.ReadFile(path + LongNameSuffix)
if err != nil {
tlog.Warn.Printf("ReadLongName: %v", err)
}
return string(content), err
}
// DeleteLongName deletes "hashName.name".
func DeleteLongName(dirfd *os.File, hashName string) error {
err := syscallcompat.Unlinkat(int(dirfd.Fd()), hashName+LongNameSuffix)
if err != nil {
tlog.Warn.Printf("DeleteLongName: %v", err)
}
return err
}
// WriteLongName encrypts plainName and writes it into "hashName.name".
// For the convenience of the caller, plainName may also be a path and will be
// converted internally.
func (n *NameTransform) WriteLongName(dirfd *os.File, hashName string, plainName string) (err error) {
plainName = filepath.Base(plainName)
// Encrypt the basename
dirIV, err := ReadDirIVAt(dirfd)
if err != nil {
return err
}
cName := n.EncryptName(plainName, dirIV)
// Write the encrypted name into hashName.name
fdRaw, err := syscallcompat.Openat(int(dirfd.Fd()), hashName+LongNameSuffix,
syscall.O_WRONLY|syscall.O_CREAT|syscall.O_EXCL, 0600)
if err != nil {
tlog.Warn.Printf("WriteLongName: Openat: %v", err)
return err
}
fd := os.NewFile(uintptr(fdRaw), hashName+LongNameSuffix)
defer fd.Close()
_, err = fd.Write([]byte(cName))
if err != nil {
tlog.Warn.Printf("WriteLongName: Write: %v", err)
}
return err
}
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