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SiteGround uses key pairs for SSH authentication purposes, as opposed to plain username and password. More information on SSH keys is available here. You can generate an SSH key pair in Mac OS following these steps: Open up the Terminal by going to Applications - Utilities - Terminal. Jul 09, 2017 For this exercise the client system is a Chromebook, and the server system is an Ubuntu VM running on Google Compute Engine. The SSH client of choice on Chrome OS devices is Secure Shell.Per its own documentation, it is possible to use public key-based authentication with the Secure Shell client.However, Secure Shell cannot generate its own keys. My goal here is to be able to SSH into. Jul 09, 2017 For this exercise the client system is a Chromebook, and the server system is an Ubuntu VM running on Google Compute Engine. The SSH client of choice on Chrome OS devices is Secure Shell. Per its own documentation, it is possible to use public key-based authentication with the Secure Shell client.

Hello World. This is the hterm/Secure Shell FAQ. If you have a question that is not answered here, please ask it on the chromium-hterm mailing list.

General Questions

What is “Secure Shell”?

Secure Shell is a Chrome Application that combines the “ssh” command (see https://www.openssh.com/ for details) ported to NativeClient with the “hterm” terminal emulator to provide a secure shell client for the Chrome browser.

Secure Shell provides similar functionality to PuTTY on Microsoft Windows(c) systems, and the ssh command-line application on Mac OS X and Linux systems.

What is “hterm”?

“HTML Terminal”, or hterm, is an xterm-compatible terminal emulator written entirely in JavaScript.

It is intended to be fast enough and correct enough to compete with native terminals such as xterm, gnome-terminal, konsole and Terminal.app.

hterm is only a terminal emulator. It does not provide SSH access (or any other text-based command) on its own.

How do Secure Shell and hterm relate to the “crosh” (Ctrl+Alt+T) command in Chrome OS?

See chromeos-crosh.md in this directory for the details.

TL;DR - Don't use crosh for ssh any more, use the Secure Shell app instead. The crosh shell will use the newer terminal emulator from Secure Shell when possible.

What's the difference between the Secure Shell App and Extension?

Chrome Appswere launched to create applications using web technology that would work like native apps on any platform Chrome runs on. Secure Shell was built on that technology.

Fast forward a few years and Chrome Apps were deprecated on all non-Chrome OS platforms. That means the Secure Shell App would only be available on Chrome OS.

In order to work on non-Chrome OS platforms, we need to migrate it to an extension. Unfortunately, doing so means we‘d lose access to some APIs that we use on Chrome OS specifically. The only option we’re left with is to maintain both an extension and an app at the same time.

If you do not care about the Chrome OS specific features, then the two versions are equivalent. Here are the few features available in the App:

SFTP mounting
Access to crosh
Icon shows up in the chrome://apps list (vs in the extension bar)

That is why we have a “Secure Shell App” and a “Secure Shell Extension” in the store (as well as “dev” versions of each). You can safely have any of them installed simultaneously.

How do hterm and Secure Shell differ from existing web terminals?

hterm stands out from many existing web terminals in that it was built from the start to match the performance and correctness of “native” terminals such as xterm and Terminal.app.

It can handle large bursts of text quickly, support very large scrollback buffers, and it closely matches xterm's behavior. The keyboard even mostly works. (ha! See the note about how to get Ctrl+W below.)

The Secure Shell app is different because it does not require a proxy or relay server to function. Secure Shell can make a direct connection to a standard sshd server on any port of the destination machine. Other web terminals require a proxy server in the middle. In some cases you are even required to hand the proxy your credentials in plain text.

What should I do if I notice a bug?

First, please continue reading this FAQ to make sure your issue isn't mentioned. Then check the bug list at https://goo.gl/VkasRC.

If you don't see the issue there, you can search the archives of the chromium-hterm mailing list.

If all else fails then join the chromium-hterm mailing list and post about what you've found.

To file an actual report, you can use https://goo.gl/vb94JY. This will route to the right people.

If your bug involves some mis-interpreted escape sequence and you want to file a really useful bug report, then add in a recording of the session. For bonus points, track down the troublesome sequence and include the offset into the log file. For more information about how to do this, see hterm's “Debugging escape sequences” section.

Is there a mailing list to discuss hterm or Secure Shell?

Yes, there is a public chromium-hterm mailing list anyone can join!

Is there a way to try early releases of Secure Shell?

Yes. First, you need to subscribe to the chromium-hterm mailing list. Subscribers have access to the “Dev” versions in the Chrome Web Store, which are located here:

Note: You'll also need to sign in to the Chrome Web Store using the same account that joined the mailing list. Otherwise, the link will result in a 404 error.

Please keep in mind that the Dev version has gone through significantly less testing than the stable versions. Fortunately, you can install both and switch back to stable if you have trouble with Dev.

Where is the source code?

The hterm source is here: https://goo.gl/8qndhN. This includes the front-end code for Secure Shell.

The Native Client wrapper around ssh is here: https://goo.gl/4tZCMI.

Is there a changelog?

Yes. Look under the doc/ directory for each project.

There is one for hterm and one for Secure Shell.

What if I want to make changes to the source?

Read the hack.md file in this directory.

Secure Shell (ssh) Questions

Is my connection proxied in any way?

No. By default all connections are made directly to the sshd server on the destination machine.

But, what if I want to ssh over HTTP?

Secure Shell also knows how to connect to an HTTP-to-ssh relay that was built inside Google. Unfortunately that relay isn‘t open source, and Google doesn’t maintain a public pool of relays.

The good news is that someone has built an open source relay. It is not supported by us though, so please take any questions/concerns about it to the author.

For more details on the relay protocol that Secure Shell supports, see the Relay Protocol document.

When I use a relay server, the IP address is always 0.0.0.0?

When using a relay server, Secure Shell only sends the hostname to the remote side that has been specified in the connection settings. The relay server is then responsible for resolving that to an actual IP address (since the name is often unresolvable locally by design!). But the relay server has no way of communicating that IP address back to the client, so Secure Shell just stubs it out with 0.0.0.0. This is harmless and may be safely ignored.

When it comes to the known hosts database, the name will be used instead.

Is my connection really secure?

The Secure Shell app uses ssh to manage the encrypted communication channels. This makes it about as secure as any other connection based on the ssh command.

It does have the added advantage of running ssh as a sandboxed Native Client plugin, which in theory makes it more secure than an unsandboxed ssh connection.

Additionally, the Secure Shell application follows a strict Content Security Policy that does not allow access to the JavaScript ‘eval’ function. This helps lower the risk that a terminal exploit could run arbitrary JavaScript.

Can I connect using a public key pair or certificate?

You can import identity files from the connection dialog. Select the “Import...” link to bring up a file pic

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