L in u X ba sics for h acke rs g e t t I n g s t a r t e d w I t h

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linuxbasicsforhackers

Giving Root Execute Permission on a New Tool

chmod u-w hashcat.hcstat
This command says to remove (
-
) the write (
w
) permission from hashcat
.hcstat for the user (
u
).
Now when you check the permissions with
ls –l
again, you should see
that the hashcat.hcstat file no longer has write permission for the user:
kali >
ls -l
total 32952
drwxr-xr-x 5 root root 4096 Dec 5 10:47 charsets
-r-xr-xr-- 1 root root 33685504 June 28 2018 hashcat.hcstat
-rw-r--r-- 1 root root 33685504 June 28 2018 hashcat.hctune
drwxr-xr-x 2 root root 4096 Dec 5 10:47 masks
drwxr-xr-x 2 root root 4096 Dec 5 10:47 OpenCL
drwxr-xr-x 3 root root 4096 Dec 5 10:47 rules
You can also change multiple permissions with just one command. If
you want to give both the user and other users (not including the group)
execute permission, you could enter the following:
kali >chmod u+x, o+x hashcat.hcstat
This command tells Linux to add the execute permission for the user
as well as the execute permission for others for the hashcat.hcstat file.
Giving Root Execute Permission on a New Tool
As a hacker, you’ll often need to download new hacking tools, but Linux
automatically assigns all files and directories default permissions of
666
and
777
, respectively. This means that, by default, you won’t be able to execute a
file immediately after downloading it. If you try, you’ll usually get a message
that says something like “Permission denied.” For these cases, you’ll need to
give yourself root and execute permissions using
chmod
in order to execute
the file.
For example, say we download a new hacker tool called
newhackertool
and place it into the root user’s directory (/).
kali >
ls -l
total 80
drwxr-xr-x 7 root root 4096 Dec 5 11.17 Desktop
drwxr-xr-x 7 root root 4096 Dec 5 11.17 Documents
drwxr-xr-x 7 root root 4096 Dec 5 11.17 Downloads
drwxr-xr-x 7 root root 4096 Dec 5 11.17 Music
-rw-r--r-- 1 root root 1072 Dec 5 11.17 newhackertool
u
drwxr-xr-x 7 root root 4096 Dec 5 11.17 Pictures

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Chapter 5
drwxr-xr-x 7 root root 4096 Dec 5 11.17 Public
drwxr-xr-x 7 root root 4096 Dec 5 11.17 Templates
drwxr-xr-x 7 root root 4096 Dec 5 11.17 Videos
We can see newhackertool at
u
, along with the rest of the contents of the
root directory. We can see that our newhackertool doesn’t have execute per-
mission for anyone. This makes it impossible to use. It might seem strange
that by default, Linux won’t let you execute a file you downloaded, but over-
all this setting makes your system more secure.
We can give ourselves permission to execute newhackertool by entering
the following:
kali >

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