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Reduced code reuse for lockdown method #62

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@royari royari commented Oct 5, 2019

#61 I tried to clean up a little bit, let me know if this is what you had in mind. I can make more changes if required.

@alichtman
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alichtman commented Oct 6, 2019

I meant something more along the lines of defining methods that perform actions, such as:

def disable_sshd():
	sp.run whatever

And then calling that in the lockdown and interactive sequences instead of the literal subprocess command.

@@ -295,48 +298,48 @@ def lockdown_procedure():
print_confirmation("Set secure configuration without user interaction.")

# Get sudo priv
sp.run("sudo -E -v", shell=True, stdout=sp.PIPE)
run_command("sudo -E -v")
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Careful... You lost a shell=True on this line that's really important.

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Hey, I explicitly didn’t want to invoke the shell through shell=True to avoid shell injection vulnerability. I tried it out through the interpreter and run_command("sudo -E -v") executes. Please let me know if I am misunderstanding the shell=True argument. Also, I'll try and define methods to perform actions.

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I explicitly didn’t want to invoke the shell through shell=True to avoid shell injection vulnerability.

I don't think there is a way to exploit this particular shell=True since there's no user input besides the sudo password. You're right to be careful though.

Take a look at the example here: https://docs.python.org/2/library/subprocess.html#frequently-used-arguments

I remember not being able to get it to work without that shell=True but it has been a very long time since I sat down with this code. I'll find some time to mess with it soon.

Comment on lines +307 to +314
run_command("sudo launchctl load /System/Library/LaunchDaemons/com.apple.alf.agent.plist")
run_command("sudo launchctl load /System/Library/LaunchAgents/com.apple.alf.useragent.plist")
run_command("sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setglobalstate on")
run_command("sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setloggingmode on")
run_command("sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setstealthmode on")
run_command("sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setallowsigned off")
run_command("sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setallowsignedapp off")
run_command("sudo pkill -HUP socketfilterfw")
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This refactor looks good to me. Strings in favor of lists.

sp.run(['sudo', '/usr/libexec/ApplicationFirewall/socketfilterfw', '--setallowsigned', 'off'], stdout=sp.PIPE)
sp.run(['sudo', '/usr/libexec/ApplicationFirewall/socketfilterfw', '--setallowsignedapp', 'off'], stdout=sp.PIPE)
sp.run(['sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.captive.control Active -bool false'], stdout=sp.PIPE)
run_command("sudo spctl --master-enable")
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Lost another shell=True.

run_command("defaults write com.apple.screensaver askForPasswordDelay -int 0")
run_command("defaults write NSGlobalDomain AppleShowAllExtensions -bool true")
run_command("defaults write NSGlobalDomain NSDocumentSaveNewDocumentsToCloud -bool false")
run_command("defaults write com.apple.finder AppleShowAllFiles -boolean true")
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Missing shell=True

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2 participants