Installation exits

  • Release version: Washingtondc
  • Updated February 1, 2024
  • 2 minutes to read
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    Summary of Installation Exits

    Installation exits in ServiceNow allow custom scripts to be executed within Java before returning control. This functionality requires the Admin role and can enhance security and user experience during authentication processes.

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    Key Features

    • Reserved Names: Certain installation exits like Login, Logout, and ValidatePassword have reserved names and cannot be modified.
    • Custom Overrides: You can override default installation exits with custom scripts for tailored behavior.
    • Available Exits: The base system includes several installation exits such as Login, Logout, ExternalAuthentication, and ValidatePassword, each serving specific functions.

    Key Outcomes

    By utilizing installation exits, ServiceNow customers can implement custom authentication methods, set session timeouts based on user roles or IP addresses, and ensure stronger password policies. This leads to improved security and a customized user experience.

    Installation exits are customizations that exit from Java to call a script before returning back to Java.

    Note:
    Functionality described here requires the Admin role.

    Available installation exits

    Navigate to System Definition > Installation Exits. Some installation exit names (Login, Logout, ValidatePassword, ExternalAuthentication) are reserved and cannot be changed. Other installation exits can override these with custom script that replaces the script in the default installation exit.

    The following installation exits are available in the base system:

    Installation Exit Description
    Login Takes a username and password pair and authenticates with the user object
    Logout Takes the user to the welcome page upon signing out; can be overridden by LogoutRedirect
    LogoutRedirect Takes the user to a specified URL upon signing out
    ExternalAuthentication Authenticates using header, parameter, or cookie; can be overridden by DigestSingleSignOn and PGPSingleSignOn
    DigestSingleSignOn Authenticates using header, parameter, or cookie and decrypts Digest encryption
    PGPSingleSignOn Authenticates using header, parameter, or cookie and decrypts PGP encryption
    ValidatePassword Active by default, starting with the Helsinki release; allows customers to define their own password validation; can be overridden by ValidatePasswordStronger
    ValidatePasswordStronger Requires passwords be at least 8 characters long and contain a digit, an uppercase letter, and a lowercase letter
    GetIntegrationSessionTimeout Implements the default integration session timeout behavior.

    Login modifications

    The following modification to the Login installation exit sets each user's session timeout value as the user is logging in. In this particular example, if the user name is admin, the session is set to timeout in 30 seconds.

    gs.include("PrototypeServer");
     
    var Login = Class.create();
    Login.prototype = {
    	initialize : function() {
    	},
     
            process : function() {
              // the request is passed in as a global
              var userName = request.getParameter("user_name");
              var userPassword = request.getParameter("user_password");
     
              var authed = GlideUser.authenticate(userName, userPassword);
              if (authed) {
                 // ***********************************************************        
                 // customization - if the userName == admin, set the session
                 // timeout to be 30 seconds. You can implement your own  
                 // session timeout algorithm here by checking to see if a user
                 // belongs to a certain group or has a certain role.
                 // Values of setMaxInactiveInterval exceeding 1440 minutes are
                 // treated as one day (1440 minutes).
      
               if (userName == "admin") {
                   request.getSession().setMaxInactiveInterval(30);
                 }
                 // ************************************************************
                 return GlideUser.getUser(userName);
              }
     
              this.loginFailed();
     
              return "login.failed";
            },
     
            loginFailed : function() {
              var message = GlideSysMessage.format("login_invalid");
              var gSession = GlideSession.get();
              gSession.addErrorMessage(message);
     
              var userName = request.getParameter("user_name");
              EventManager.queue("login.failed", "", userName, "");
           }
     
    }

    Session timeout can also be set according to IP address.

    gs.include("PrototypeServer");
     
    var Login = Class.create();
    Login.prototype = {
    	initialize : function() {
    	},
     
            process : function() {
              // the request is passed in as a global
              var userName = request.getParameter("user_name");
              var userPassword = request.getParameter("user_password");
     
              var authed = GlideUser.authenticate(userName, userPassword);
              if (authed) {
     
              // **************************************************************
              // customization - if the user is logging in from a particular IP
              // range starting with XXX.XXX you can implement your own
              // session timeout algorithm here by checking the login IP
              // 
              // Values of setMaxInactiveInterval exceeding 1440 minutes are
              // treated as one day (1440 minutes).
     
              var clientIP = gs.getSession().getClientIP().toString();
    
              // if client IP starts with specified range
              if (clientIP.indexOf('XXX.XXX') == 0) {  
                 // set to 10 hours
                 request.getSession().setMaxInactiveInterval(60 * 60 * 10); 
              }
              // ***************************************************************
     
                 return GlideUser.getUser(userName);
              }
     
              this.loginFailed();
     
              return "login.failed";
            },
     
            loginFailed : function() {
              var message = GlideSysMessage.format("login_invalid");
              var gSession = GlideSession.get();
              gSession.addErrorMessage(message);
     
              var userName = request.getParameter("user_name");
              EventManager.queue("login.failed", "", userName, "");
           }
     
    }