chflags uappend allows you to truncate and crush
Hello!
I want to a directory that is to store the backups. Other computers must connect by sharing.
To harden a little against the encryption of Trojans and other ransomware, I would like to define permissions in that directory in a way that only the creation of directories and new files or add to existing files is permitted.
I can't see how this archive with the command chmod + a..., because the only addition seems to be missing.
So I tried, since macos has not chattr, chflags:
sudo chflags-r sappend testdir
sudo chflags-r uappend testdir
(For the user and system, just to be sure...)
But I can make several times
echo testdir/TestFile.txt
echo testdir/TestFile.txt
without errors.
But adding only should reject attempts to change existing information or truncating the file.
You can get rid of the flags with
sudo chflags-r nosappend testdir
sudo chflags-r nouappend testdir
Where I'm wrong?
Thanks for the help!
Andi
You need raise the security level of the kernel. To display the current level of security using the following command:
sysctl kern.securelevel
The security level must be set to 1. I don't know if versions more recent Mac OS x read /etc/sysctl.conf but you can try to put it there.
Tags: Mac OS & System Software
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