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lib/model: Chmod to mode|0700, not 755 (#8235)

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greatroar 2022-03-26 11:07:07 +01:00 committed by GitHub
parent 4be867c560
commit 0eca0ac45a
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1 changed files with 19 additions and 16 deletions
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35
lib/model/util.go
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@ -114,26 +114,29 @@ func inWritableDir(fn func(string) error, targetFs fs.Filesystem, path string, i
if !info.IsDir() {
return errors.New("Not a directory: " + path)
}
if info.Mode()&0200 == 0 {
const permBits = fs.ModePerm | fs.ModeSetuid | fs.ModeSetgid | fs.ModeSticky
if mode := info.Mode() & permBits; mode&0200 == 0 {
// A non-writeable directory (for this user; we assume that's the
// relevant part). Temporarily change the mode so we can delete the
// file or directory inside it.
if err := targetFs.Chmod(dir, 0755); err == nil {
// Chmod succeeded, we should change the permissions back on the way
// out. If we fail we log the error as we have irrevocably messed up
// at this point. :( (The operation we were called to wrap has
// succeeded or failed on its own so returning an error to the
// caller is inappropriate.)
defer func() {
if err := targetFs.Chmod(dir, info.Mode()&fs.ModePerm); err != nil && !fs.IsNotExist(err) {
logFn := l.Warnln
if ignorePerms {
logFn = l.Debugln
}
logFn("Failed to restore directory permissions after gaining write access:", err)
}
}()
if err := targetFs.Chmod(dir, mode|0700); err != nil {
return err
}
// Chmod succeeded, we should change the permissions back on the way
// out. If we fail we log the error as we have irrevocably messed up
// at this point. :( (The operation we were called to wrap has
// succeeded or failed on its own so returning an error to the
// caller is inappropriate.)
defer func() {
if err := targetFs.Chmod(dir, mode); err != nil && !fs.IsNotExist(err) {
logFn := l.Warnln
if ignorePerms {
logFn = l.Debugln
}
logFn("Failed to restore directory permissions after gaining write access:", err)
}
}()
}
return fn(path)