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OnionShare

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OnionShare Logo

Introduction[edit]

OnionShare Functionality[edit]

OnionShare is an open source program that allows users to share/receive files, host a website or chat anonymously utilizing the Tor network. [1] The OnionShare wiki succinctly describes the design: [2]

Web servers are started locally on your computer and made accessible to other people as Tor onion services [archive].

By default, OnionShare web addresses are protected with a random password. A typical OnionShare address might look something like this:

http://onionshare:constrict-purity@by4im3ir5nsvygprmjq74xwplrkdgt44qmeapxawwikxacmr3dqzyjad.onion [archive]

You’re responsible for securely sharing that URL using a communication channel of your choice like in an encrypted chat message, or using something less secure like unencrypted e-mail, depending on your threat model [archive].

The people you send the URL to then copy and paste it into their Tor Browser [archive] to access the OnionShare service.

As of OnionShare version 2.0 it is also possible to run the program in Receive mode. This means you can receive files via OnionShare after they are uploaded by Tor Browser users; this is a sort of 'SecureDrop Lite' or personal dropbox. Version 2.2 of OnionShare also permits the easy hosting of anonymous websites [archive]:

In addition to the “Share Files” and “Receive Files” tabs, OnionShare 2.2 introduces the “Publish Website” tab. You drag all of the files that make up your website into the OnionShare window and click “Start sharing.” It will start a web server to host your static website and give you a .onion URL. This website is only accessible from the Tor network, so people will need Tor Browser to visit it. People who visit your website will have no idea who you are – they won’t have access to your IP address, and they won’t know your identity or your location. And, so long as your website visitors are able to access the Tor network, the website can’t be censored.

Version 2.3 of OnionShare allows users to share/receive files, host websites or chat anonymously at the same time using a tabs feature. The secure, ephemeral and anonymous chat feature is particularly useful since it does not require account creation, is encrypted end-to-end and reduces the risk of messages being stored locally: [3]

Now when you open OnionShare you are presented with a blank tab that lets you choose between sharing files, receiving files, hosting a website, or chatting anonymous. You can have as many tabs open as you want at a time, and you can easily save tabs (that's what the purple thumbtack in the tab bar means) so that if you quit OnionShare and open it again later, these services can start back up with the same OnionShare addresses. ... Another major new feature is chat. You start a chat service, it gives you an OnionShare address, and then you send this address to everyone who is invited to the chat room (using an encrypted messaging app like Signal, for example). Then everyone loads this address in a Tor Browser, makes up a name to go by, and can have a completely private conversation.

As OnionShare is an actively developed project, it is recommended to refer to official documentation [archive] for the latest features and information before use. Advanced users should also consider additional features [archive] like saving of tabs, turning off passwords, scheduled start/stop times, command line operations and legacy addresses.

Security Design[edit]

Table: OnionShare Security Design [4]

Protections Description
Third party access Third parties cannot access anything that happens in OnionShare because services are hosted directly on your computer. Filesharing does not utilise online servers, and chat rooms also use your computer as a server; trust in other computers is removed.
Network eavesdroppers Eavesdroppers cannot spy on OnionShare activities in transit because connections between Tor onions services and Tor Browser are encrypted end-to-end. Even malicious Tor nodes used for connections will only see encrypted traffic using the onion service's private key.
Anonymity OnionShare anonymity is protected by Tor. If OnionShare addresses are anonymously communicated with Tor Browser users, then eavesdroppers cannot learn the identity of the OnionShare user.
Onion service discovery Malicious actors cannot access anything just by learning about the onion service; attackers also need to guess the private key used for client authentication (access). [5]

OnionShare cannot protect users if the OnionShare address and private key is not communicated securely. For example, do not share this information via email which can be potentially monitored by attackers. It is far safer to utilize encrypted text messages for this purpose (preferably with disappearing messages enabled), encrypted email, or in-person sharing of this information. This method is not anonymous unless a new email account or chat account is only created/accessed over Tor.

Installation[edit]

Whonix-Gateway ™ Installation Steps[edit]

onion-grater Profile[edit]

Ambox notice.png This application requires incoming connections through a Tor onion service. Supported Whonix-Gateway ™ modifications are therefore necessary for full functionality; see instructions below.

For better security, consider using Multiple Whonix-Gateway ™ and Multiple Whonix-Workstation ™. In any case, Whonix ™ is the safest choice for running it. [6]

Extend the onion-grater whitelist in Whonix-Gateway ™ (sys-whonix).

On Whonix-Gateway ™. [7] [8]

Add onion-grater profile. 

sudo onion-grater-add 40_onionshare

Whonix-Workstation ™ Installation Steps[edit]

Firewall Settings[edit]

Modify the Whonix-Workstation ™ (anon-onionshare) user firewall settings and reload them.

Modify Whonix-Workstation ™ User Firewall Settings

Note: If no changes have yet been made to Whonix ™ Firewall Settings, then the Whonix ™ User Firewall Settings File /etc/whonix_firewall.d/50_user.conf appears empty (because it does not exist). This is expected.

If using Qubes-Whonix ™, complete these steps.
In Whonix-Workstation ™ App Qube. Make sure folder /usr/local/etc/whonix_firewall.d exists. 

sudo mkdir -p /usr/local/etc/whonix_firewall.d

Qubes App Launcher (blue/grey "Q") → Whonix-Workstation ™ App Qube (commonly called anon-whonix) → Whonix ™ User Firewall Settings

If using a graphical Whonix-Workstation ™, complete these steps.

Start Menu → Applications → System → User Firewall Settings

If using a terminal-only Whonix-Workstation ™, complete these steps.

Open /usr/local/etc/whonix_firewall.d/50_user.conf with root rights. 

sudoedit /usr/local/etc/whonix_firewall.d/50_user.conf

For more help, press on Expand on the right.

Note: This is for informational purposes only! Do not edit /etc/whonix_firewall.d/30_whonix_workstation_default.conf.

The Whonix ™ Global Firewall Settings File /etc/whonix_firewall.d/30_whonix_workstation_default.conf contains default settings and explanatory comments about their purpose. By default, the file is opened read-only and is not meant to be directly edited. Below, it is recommended to open the file without root rights. The file contains an explanatory comment on how to change firewall settings. 

## Please use "/etc/whonix_firewall.d/50_user.conf" for your custom configuration,
## which will override the defaults found here. When {{project_name}} is updated, this
## file may be overwritten.

Also see: Whonix modular flexible .d style configuration folders.

To view the file, follow these instructions.

If using Qubes-Whonix ™, complete these steps.

Qubes App Launcher (blue/grey "Q") → Template: whonix-ws-16 → Whonix Global Firewall Settings

If using a graphical Whonix-Workstation ™, complete these steps.

Start Menu → Applications → Settings → Global Firewall Settings

If using a terminal-only Whonix-Workstation ™, complete these steps.

In Whonix-Workstation ™, open the whonix_firewall configuration file in an editor. 

nano /etc/whonix_firewall.d/30_whonix_workstation_default.conf

Add. [9] 

EXTERNAL_OPEN_PORTS+=" $(seq 17600 17659) "

Save.

Reload Whonix-Workstation ™ Firewall.

If you are using Qubes-Whonix ™, complete the following steps.

Qubes App Launcher (blue/grey "Q") → Whonix-Workstation ™ App Qube (commonly named anon-whonix) → Reload Whonix ™ Firewall

If you are using a graphical Whonix-Workstation ™, complete the following steps.

Start Menu → Applications → System → Reload Whonix ™ Firewall

If you are using a terminal-only Whonix-Workstation ™, run. 

sudo whonix_firewall

Installation[edit]

Before installing OnionShare:

  • A separate Whonix-Workstation ™ (Qubes-Whonix ™: anon-onionshare App Qube) is also recommended; see footnote. [10] The reason is the OnionShare installation will persist in this configuration and it is best practice to separate different, anonymous activities in distinct VMs (App Qubes).
  • After installation has finished, apply the Whonix ™ VM Configuration steps.
  • Installation using flatpak is discouraged because it leads to Tor over Tor.
  • Installation from Debian package sources as documented below is recommended.

Inside Whonix-Workstation ™.

Install onionshare.

1. Update the package lists. 

sudo apt update

2. Upgrade the system. 

sudo apt full-upgrade

3. Install the onionshare package.

Using apt command line parameter --no-install-recommends is in most cases optional. 

sudo apt install --no-install-recommends onionshare

4. Done.

The procedure of installing onionshare is complete.

Using OnionShare[edit]

Start OnionShare[edit]

Inside Whonix-Workstation ™.

If OnionShare was installed from Debian package sources, launch it in Whonix-Workstation ™ by either running the command line interface (CLI) or graphical user interface (GUI) version.

  • CLI: 
    onionshare

  • GUI: 
    onionshare-gui

  • If the flatpak version was installed (discouraged because of Tor over Tor), run. 
    flatpak run org.onionshare.OnionShare

Figure: First Start of OnionShare v2.4 GUI

Onionsharehomepage.png

OnionShare Configuration[edit]

If OnionShare was installed from Debian package sources as documented on this wiki page, then no configuration changes specific to Whonix ™ in the OnionShare application are required. [11]

How-to: Use OnionShare[edit]

Later OnionShare versions have significantly improved functionality:

  • Version 2.0 provides a feature called 'Receive Mode'. With this mode, you can start an onion service and allow other users to upload files to you via Tor Browser (rather than Share Mode, in which you share files from your OnionShare to others).
  • Version 2.2 allows the hosting of static HTML websites.
  • Version 2.3 allows users to set up a private, secure chat room that does not require an account and does not log activity.

A complete user guide is available, including advanced topics, hardening options [12] and development documentation; refer to the official website [archive].

Do not change settings without fully understanding their function, otherwise onion addresses might be re-used, shares might be left open even after multiple downloads are performed, and so on.

Share Files[edit]

Once OnionShare has been installed correctly and the Tor check is successful, sharing files anonymously is easy: [13]

You can use OnionShare to send files and folders to people securely and anonymously. Open a share tab, drag in the files and folders you wish to share, and click “Start sharing”.

... When you’re ready to share, click the “Start sharing” button. You can always click “Stop sharing”, or quit OnionShare, immediately taking the website down. You can also click the “↑” icon in the top-right corner to show the history and progress of people downloading files from you.

Now that you have a OnionShare, copy the address and send it to the person you want to receive the files. If the files need to stay secure, or the person is otherwise exposed to danger, use an encrypted messaging app.

That person then must load the address in Tor Browser. After logging in with the random password included in the web address, the files can be downloaded directly from your computer by clicking the “Download Files” link in the corner.

Figure: Select File to Share

Sharefileone.png

Figure: Secret Onion URL for Downloaders

Sharefiletwo.png

Figure: OnionShare Download with Tor Browser [14]

OnionSharereceive.png

Receive Files and Messages[edit]

Receiving files or messages is also simple: [15]

You can use OnionShare to let people anonymously submit files and messages directly to your computer, essentially turning it into an anonymous dropbox. Open a receive tab and choose the settings that you want.

You can browse for a folder to save messages and files that get submitted.

You can check “Disable submitting text” if want to only allow file uploads, and you can check “Disable uploading files” if you want to only allow submitting text messages, like for an anonymous contact form.

Figure: Receive Files or Messages

Onionsharereceivefiles.png

Website Hosting[edit]

Website hosting can be achieved in a few steps: [16]

To host a static HTML website with OnionShare, open a website tab, drag the files and folders that make up the static content there, and click “Start sharing” when you are ready. If you add an index.html file, it will render when someone loads your website. You should also include any other HTML files, CSS files, JavaScript files, and images that make up the website. (Note that OnionShare only supports hosting static websites. It can’t host websites that execute code or use databases. So you can’t for example use WordPress.)

This functionality means content can be shared temporarily to select individuals, or it can be run as a public service if desired.

Anonymous Chat[edit]

Finally, private and secure chat rooms (without logging) are possible by: [17]

  1. Opening a chat tab and selecting "Start chat server".
  2. Copy the onion address and private key and send them to the intended recipients. [18]
  3. To join the chat room, participants cut and paste the OnionShare address into Tor Brower; JavaScript is required, so the security level must be set to "Standard" or "Safer".
  4. After joining, participants are assigned a random name.

The benefit of OnionShare anonymous chat is no copies of messages are left on devices or possibly on servers/databases, and account creation is unnecessary.

OnionShare AppArmor Profiles[edit]

AppArmor profiles are available to better contain OnionShare, but they have not yet been tested in Whonix ™. [19] Profile development is reported to be lagging behind the master and development branches of the OnionShare git repository. Therefore, willing testers should be knowledgeable about AppArmor profiles before attempting this procedure.

Advanced users are encouraged to help progress the open OnionShare AppArmor ticket [archive] and help complete this wiki section. Successes or failures can also be reported in the Whonix ™ AppArmor forum [archive].

TODO: Test profiles and expand this section.

Footnotes[edit]

  1. ↑ https://onionshare.org/ [archive]
  2. ↑ https://docs.onionshare.org/ [archive]
  3. ↑ https://blog.torproject.org/new-release-onionshare-23 [archive]
  4. ↑ https://docs.onionshare.org/2.4/en/security.html [archive]
  5. ↑ Unless the private key feature is turned off [archive].
  6. ↑ Security considerations:
    • By using Whonix ™, additional protections are in place for greater security.
    • This application requires access to Tor's control protocol.
    • In the Whonix ™ context, Tor's control protocol has dangerous features. The Tor control command GETINFO address reveals the real, external IP of the Tor client.
    • Whonix ™ provides onion-grater, a Tor Control Port Filter Proxy - filtering dangerous Tor Control Port commands.
    • When this application is run inside Whonix ™ with an onion-grater whitelist extension, this will limit application rights to Tor control protocol access only. Non-whitelisted Tor control commands such as GETINFO address are rejected by onion-grater in these circumstances.
    • During the application's normal operations it should not attempt to use dangerous Tor control commands such as GETINFO address. In the event the application or Whonix-Workstation ™ are compromised, this command would be rejected.
    • In comparison, if the application is run on a non-Tor focused operating system like Debian, it will have unlimited access to Tor's control protocol (a less secure configuration).
    • If the (non-)Whonix platform is used to host onion services, then running applications are more vulnerable to attacks against the Tor network compared to when Tor is solely used as a client; see also Onion Services Security.
    In conclusion, Whonix ™ is the safest and correct choice for running this application.
  7. ↑ Using /usr/local/etc/onion-grater-merger.d/ because that onion-grater settings folder is persistent in Qubes-Whonix ™ TemplateBased ProxyVMs i.e. Whonix-Gateway ™ (commonly called sys-whonix). Non-Qubes-Whonix ™ users could also utilize /etc/onion-grater-merger.d/. Qubes-Whonix ™ users could also utilize /etc/onion-grater-merger.d/ but then /etc/onion-grater-merger.d/ must be made persistent, which means doing this procedure inside the Whonix-Gateway ™ TemplateVM (commonly called whonix-gw-16) and then restarting the Whonix-Gateway ™ ProxyVM or using bind-dirs [archive]. Both techniques are more complicated than simply using /usr/local/etc/onion-grater-merger.d/, since it is persistent either way. Further, it even allows multiple Whonix-Gateway ™ ProxyVMs based on the same Whonix-Gateway ™ TemplateVM; for example, one Whonix-Gateway ™ ProxyVM extending and relaxing onion-grater's whitelist and the other Whonix-Gateway ™ ProxyVM having the default onion-grater whitelist which is more restrictive.
  8. ↑ Previously manual instructions. No longer needed. onion-grater-add automates that. 
    sudo mkdir -p /usr/local/etc/onion-grater-merger.d/

    Symlink the onion-grater profile to the onion-grater settings folder. 

    sudo ln -s {{{filename_new}}}.yml /usr/local/etc/onion-grater-merger.d/

    Restart onion-grater. 

    sudo service onion-grater restart
  9. ↑ As per https://labs.riseup.net/code/issues/7870#note-15 [archive] OnionShare uses ports 17600 to 17659.
  10. ↑ To clone the existing anon-whonix in Qubes-Whonix ™:
    • Qube Manager → Right-click on anon-vm → Select "Clone qube" → Rename to "anon-onionshare"
  11. ↑ Under "How should OnionShare connect to Tor?" no changes are required. Even setting "Use the Tor version built into OnionShare" is OK in the very case of OnionShare and does not lead to Tor over Tor thanks to special support by anon-ws-disable-stacked-tor. https://github.com/Whonix/anon-ws-disable-stacked-tor/blob/master/usr/bin/tor.anondist#L70 [archive]
  12. ↑ Such as setting a Shutdown Timer to self-destruct shares if they are not downloaded within an acceptable time window. These topics are beyond the scope of this documentation.
  13. ↑ https://docs.onionshare.org/2.3.1/en/features.html [archive]
  14. ↑ https://micahflee.com/2018/02/onionshare-has-some-exciting-new-features/ [archive]
  15. ↑ https://docs.onionshare.org/2.4/en/features.html#receive-files-and-messages [archive]
  16. ↑ https://docs.onionshare.org/2.4/en/features.html#host-a-website [archive]
  17. ↑ https://docs.onionshare.org/2.4/en/features.html#chat-anonymously [archive]
  18. ↑ Preferably with an encrypted messaging application.
  19. ↑ https://github.com/micahflee/onionshare/tree/develop/apparmor [archive]
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