Security Assertion Markup Language (SAML) is available starting with release v22.07.00.

To configure your system:

  1. Download and install on your server Submitty version v22.07.00 or later.

  2. Generate the meta data file for your server.

    • Make the directory

      mkdir -p /usr/local/submitty/config/saml/certs/
      cd /usr/local/submitty/config/saml/certs/
    • Generate private key and certificate. NOTE: these will be placed in current directory.

      openssl req -x509 -sha256 -nodes -days 8000 -newkey rsa:4096 -keyout sp.key -out sp.crt

      Sample interaction:

      Country Name (2 letter code) [AU]: <INSERT YOUR ANSWER>
      State or Province Name (full name) [Some-State]: <INSERT YOUR ANSWER>
      Locality Name (eg, city) []: <INSERT YOUR ANSWER>
      Organization Name (eg, company) [Internet Widgits Pty Ltd]: <INSERT YOUR ANSWER>
      Organizational Unit Name (eg, section) []: <INSERT YOUR ANSWER>
      Common Name (e.g. server FQDN or YOUR name) []: <INSERT YOUR ANSWER>
      Email Address []: <INSERT YOUR ANSWER>
    • Verify sp.key and sp.crt are in /usr/local/submitty/config/saml/certs/

    • Set the ownership and permissions on the key sp.key (it should not be shared with anyone!) and certificate cp.crt (will be shared with your Identify Provider):

      chgrp submitty_php /usr/local/submitty/config/saml/
      chgrp submitty_php /usr/local/submitty/config/saml/certs/
      chgrp submitty_php /usr/local/submitty/config/saml/certs/sp.crt
      chgrp submitty_php /usr/local/submitty/config/saml/certs/sp.key
      chmod g+r /usr/local/submitty/config/saml/certs/sp.key
    • Fetch the metadata from your Identity Provider (IdP) and create and save it as file /usr/local/submitty/config/saml/idp_metadata.xml

      For example, if your IdP’s metadata is stored here:

      Then you would type:

      curl > /usr/local/submitty/config/saml/idp_metadata.xml

      And set the ownership and permissions of this file:

      chgrp submitty_php /usr/local/submitty/config/saml/idp_metadata.xml
    • Prepare the metadata file. Run:

      /usr/local/submitty/sbin/saml_utils.php --generate_metadata
    • Send the metadata file, /usr/local/submitty/config/saml/sp_metadata.xml to the sysadmins for your Identity Provider.

      Note: This file does not need to be preserved on your system – the owner/group permissions on this file are not important, it’s ok to leave this file owned and accessible only by root.

  3. Configure SAML

    • Get the SAML username attribute from your Identity Provider (IdP). After a user is successfully authenticated, the username attribute is the field from the return object that contains the user’s username.

    • Re-run to enable SAML, specify the SAML username attribute, and customize login message.

      python3 /usr/local/submitty/GIT_CHECKOUT/Submitty/.setup/

      You can press return to keep the current settings for most of the settings, except:

      What authentication method to use:
      1. PamAuthentication
      2. DatabaseAuthentication
      3. LdapAuthentication
      4. SamlAuthentication
      Enter number?: [1] 4
      Enter name you would like shown to user for authentication?: <YOUR CUSTOM MESSAGE E.g., "Login with your University ID via Duo">
      Enter SAML username attribute?:  <ENTER THE SAML username attribute>
    • Reinstall Submitty, run:

    • Customize the username validation script, which is used to differentiate and/or verify the validity of SAML usernames and proxy users. Modify the sample SAML validation C++ program as necessary for your Identity Provider and university policies.

      #include <iostream>
      #include <regex>
      #include <string>
      // see also:
      int main(int argc, char** argv) {
        // must be called with a single argument, the username to validate
        // as a SAML username
        if (argc != 2) {
          std::cout << "invalid" << std::endl;
          return 0;
        // exceptions for VALID userames
        if (std::string(argv[1]) == "actually_a_valid_username"
            ) {
          std::cout << "valid" << std::endl;
          return 0;
        // exceptions for INVALID userames
        if (std::string(argv[1]) == "abc" ||
            std::string(argv[1]) == "def" ||
            ) {
          std::cout << "invalid" << std::endl;
          return 0;
        // general pattern for VALID usernames
        if (std::regex_match(argv[1], std::regex("^[a-z]{2,6}[0-9]{0,2}$"))) {
          std::cout << "valid" << std::endl;
          return 0;
        std::cout << "invalid" << std::endl;

      Compile this program to an executable with the path /usr/local/submitty/config/saml/validate:

      clang++ -g -O3 -o /usr/local/submitty/config/saml/validate /usr/local/submitty/config/saml/validate.cpp

      Set the owner, group, and permissions of this file, NOTE: submitty_cgi must have execute permissions:

      chown root:submitty_php /usr/local/submitty/config/saml/validate
      chmod 750 /usr/local/submitty/config/saml/validate
    • Put all current users into the SAML table by running:

      /usr/local/submitty/sbin/saml_utils.php --add_users

      This program may run for a few minutes, it will take a few seconds per user on your system. It checks the SAML validity of every username and inserts this information into the saml_mapped_users table of the main Submitty database.

    • Inspect the contents of the SAML user data in the main Submitty database.

      select * from saml_mapped_users;

      Most student users will have a one-to-one mapping from their SAML id/username to their Submitty user id.

       id | saml_id | user_id | active
      1   | smithj  | smithj  | t
      2   | jonesb2 | jonesb2 | t
      3   | leec    | leec    | t

      An instructor user with a secondary account for testing can have multiple Submitty id’s mapped to the same SAML id/username.

       id | saml_id | user_id    | active
      4   | ortizf  | ortizf     | t
      5   | ortizf  | ortizf-stu | t

      Multiple SAML id’s may be mapped to the same user_id to facilitate access to a shared Submitty system admin account. For example: To allow If multiple users can logAn instructor user with a secondary account for testing can have multiple Submitty id’s mapped to the samel SAML id/username.

       id | saml_id | user_id        | active
      6   | kingd   | submitty_admin | t
      7   | warde4  | submitty_admin | t
    • Periodically, check the validity and completeness of data in the saml table using the username validation script:

      /usr/local/submitty/sbin/saml_utils.php --validate_users

      This program may run for a few minutes, it will take a few seconds per user on your system.

    • Correct and/or add additional SAML id to Submitty user id mappings to this table either through manual database inserts or using the Web UI, accessible from the left sidebar of a superuser account, SAML Management.

      TODO: add screenshots
  4. Customize your login screen. Write markdown in /usr/local/submitty/config/

    For example:

    Submitty now uses Authentication via Cisco Duo.
    Contact if you have problems or questions.
  5. After making the switch to SAML, you will likely want to force everyone to re-authenticate with your new Identity Provider (IdP). This can be done in a few ways:

    • By clearing the session table in the database.

      TRUNCATE TABLE sessions;
    • Or, by running It will clear the jwt secret and invalidate all current sessions.