Can I access parameters in my protractor configuration file?

I am not completely sure if protractor globals are set at the beforeLaunch() stage, but they are definitely available at onPrepare() step.

Access the params object through the global browser object:

console.log(browser.params.baseUrl);

Update: Using Jasmine 2.6+, protractor 4.x, browser.params was empty, but the following worked in onPrepare() step:

console.log(browser.baseUrl);

In case you need every single item in the entire configuration file, you can use browser.getProcessedConfig() to do this.

onPrepare: () => {
    browser.getProcessedConfig().then(console.log); // even `params` is in here
}