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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