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duo_unix - Duo two-factor authentication for Unix systems
Duo provides simple two-factor authentication as a service via:
1. Phone callback
2. SMS-delivered one-time passcodes
3. Duo mobile app to generate one-time passcodes
4. Duo mobile app for smartphone push authentication
5. Duo hardware token to generate one-time passcodes
This package allows an admin (or ordinary user) to quickly add Duo
authentication to any Unix login without setting up secondary user
accounts, directory synchronization, servers, or hardware.
What's here:
Simple C API for the Duo two-factor authentication service.
Login utility to add secondary Duo authentication to any login
(e.g. via sshd ForceCommand or ~/.ssh/authorized_keys command)
to augment password, pubkey, or other primary auth method.
Optional Pluggable Authentication Module for Linux, FreeBSD,
NetBSD, MacOS X, Solaris, AIX, HP-UX to add Duo authentication
system-wide (e.g. sshd, sudo, su, samba, etc.)
Build dependencies (install these first!):
OpenSSL ( development headers and libraries
are installed by default on *BSD and MacOS X.
Solaris, HP-UX, AIX: 3rd party packages or source build
Redhat/Fedora/CentOS: yum install openssl-devel
Debian/Ubuntu: apt-get install libssl-dev
Only required if building with PAM support (--with-pam below).
System PAM development headers and libraries are installed by
default on FreeBSD, NetBSD, MacOS X, Solaris, HP-UX, and AIX.
RedHat/Fedora/CentOS: yum install pam-devel
Debian/Ubuntu: apt-get install libpam-dev
Options to ./configure:
Specify the OpenSSL directory if not found automatically.
Build PAM module, and optionally override the default install
directory (determined automatically by platform) if necessary.
Specify a different user for login_duo privilege separation -
by default, "sshd" (or "_sshd" on MacOS X).
The default path for local configuration files will be set to /etc/duo
(which can be changed by specifying --sysconfdir=DIR).
NOTE: If you're missing ./configure you accidentally downloaded the
git source tree tarball. Get a versioned package tarball instead:
Then just run "make".
"make install" as root should do it.
login_duo will be installed setuid root by default in order to keep
the Duo integration and secret keys in your configuration files
secret. It may also be installed non-setuid manually for a user
installation with individual (vs. system-wide) configuration files.
The pam_duo module will be installed in the system PAM module location
by default (/lib/security, /usr/lib/security, /usr/lib/pam, /usr/lib
depending on platform).
If you don't have a Duo account, sign up at
From your admin account, add a new Unix integration (Integrations >
New integration) and use the integration key (ikey), secret key
(skey), and API hostname in your Duo configuration files (by default
in /etc/duo).
You do not need to create any user accounts manually - new Duo users
will be created as each user logs in and enrolls their own device.
To test your Duo configuration, run login_duo from the command line as
your target user - for the default setuid-root install:
$ login_duo -d echo YOU ROCK
For a non-setuid install:
$ ./login_duo -d -c login_duo.conf echo YOU ROCK
If your Duo integration and secret keys are valid, you will be able to
enroll and authenticate successfully, and congratulate yourself. :-)
Additional duo_unix documentation is available here:
Join our mailing list for technical discussion of duo_unix:
Report any bugs, feature requests, etc. to us directly:
Have fun!