sudo-touchid is a fork of
sudo with Touch ID support on macOS (powered by the
LocalAuthentication framework). Once compiled, it will allow you to authenticate
sudo commands with Touch ID in the Terminal on supported Macs (such as the late 2016 MacBook Pros).
- I am not a security expert. While I am using this as a fun experiment on my personal computer, your security needs may vary.
- This has only been tested on the 2016 15" MacBook Pro with Touch Bar running macOS 10.12.1.
sudo-touchid, simply open the included Xcode project file with Xcode 8+, select the
Build All target, and click Build.
If we try running our newly-built
sudo executable now, we'll get an error:
sudo must be owned by uid 0 and have the setuid bit set
To fix this, we can use our system's
sudo command and the
chown/chmod commands to give our newly-built
sudo the permissions it needs:
sudo chown root:wheel sudo && sudo chmod 4755 sudo
Now if we try running our copy of
sudo, it should work:
If you don't have a Mac with a biometric sensor,
sudo-touchid will fail. If you'd still like to test whether the
LocalAuthentication framework is working correctly, you can change the
kAuthPolicy constant to
sudo/plugins/sudoers/auth/sudo_auth.m. This will present a dialog box asking the user for his or her password:
While not useful in practice, you can use this to verify that the
LocalAuthentication code does in fact work.
Replacing the system's
sudo program is quite risky (can prevent your Mac from booting) and requires disabling System Integrity Protection (aka "Rootless").
Instead of replacing
sudo, we can install our build under
/usr/local/bin and give the path precedence over
/usr/bin, this way our build is found first.
sudo cp (built-products-directory)/sudo /usr/local/bin/sudo
sudo chown root:wheel /usr/local/bin/sudo && sudo chmod 4755 /usr/local/bin/sudo
You can set up your
PATH by adding
export PATH=/usr/local/bin:$PATH to
.bashrc (thanks @edenzik).
Now you should be able to enter
sudo in any Terminal (or iTerm) window and authenticate with Touch ID!