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Overview -------- duo_unix - Duo two-factor authentication for Unix systems Duo provides simple two-factor authentication as a service. 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: lib Simple C API for the Duo two-factor authentication service. login_duo 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. pam_duo 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 ----- Build dependencies (install these first!): OpenSSL OpenSSL (http://openssl.org) 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 SUSE/SLES: zypper install libopenssl-devel libpam 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 SUSE/SLES: zypper install pam-devel zlib When compiling for SLES 11, it is reported that you need the zlib package during compilation. SUSE/SLES: zypper install zlib-devel Options to ./configure: --with-openssl=DIR Specify the OpenSSL directory if not found automatically. --with-pam[=DIR] Build PAM module, and optionally override the default install directory (determined automatically by platform) if necessary. --with-privsep-user=USER 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: https://github.com/duosecurity/duo_unix/downloads Then just run "make". Install ------- "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). Setup ----- If you don't have a Duo account, sign up at http://www.duosecurity.com 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. Test ---- 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. :-) Setuid ------ The login_duo binary is marked setuid in order to read the protected login_duo.conf configuration file. However, privileges are dropped immediately after so the privileged attack surface is minimal. Support ------- Additional duo_unix documentation is available here: http://www.duosecurity.com/docs/duounix Report any bugs, feature requests, etc. here: https://github.com/duosecurity/duo_unix/issues Have fun! --- http://www.duosecurity.com