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OnionShare

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About this OnionShare Page
Support Status stable
Difficulty easy
Maintainer mig5
Support Support

Introduction[edit]

OnionShare is an open source program that allows a file of any size to be shared securely and anonymously using the Tor network. [1] The OnionShare wiki succinctly describes the design: [2]

It works by starting a web server, making it accessible as a Tor Onion Service, and generating an unguessable URL to access and download the files. It does not require setting up a separate server or using a third party file-sharing service. You host the files on your own computer and use a Tor Onion Service to make it temporarily accessible over the internet. The receiving user just needs to open the URL in Tor Browser to download the file.

As of OnionShare 2, it is also possible to run the program in Receive mode, which allows you to receive files via OnionShare, uploaded by users using Tor Browser - a sort of 'SecureDrop Lite', or personal dropbox.

At the time of writing, the OnionShare package is not packaged in Debian stretch. [3] For these reasons, the following instructions use the most recent version available from GitHub. Advanced users may prefer to use APT pinning to install the version from Debian buster instead. However, installing from a tagged release in Git ensures you have access to the latest features.

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 ™s and Multiple Whonix-Workstation ™s. In any case, Whonix ™ is the safest choice for running it. [4]

Install OnionShare[edit]

OnionShare is installed by default since Whonix 15.

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

Extend onion-grater Whitelist

On Whonix-Gateway ™.

Create a new directory. [5] 

sudo mkdir -p /usr/local/etc/onion-grater-merger.d/

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

sudo ln -s /usr/share/doc/onion-grater-merger/examples/40_onionshare.yml /usr/local/etc/onion-grater-merger.d/

Restart onion-grater. 

sudo service onion-grater restart

2. 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 ™ AppVM.

Make sure folder /rw/config/whonix_firewall.d exists. 

sudo mkdir -p /rw/config/whonix_firewall.d

Open /rw/config/whonix_firewall.d/50_user.conf with root rights. 

lxsu mousepad /rw/config/whonix_firewall.d/50_user.conf

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

Start Menu → Applications → Settings → User Firewall Settings

If using Non-Qubes-Whonix ™, complete this step.

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

sudo nano /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_default.conf

The Whonix Global Firewall Settings File /etc/whonix_firewall.d/30_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 Whonix is updated, this
## file may be overwritten.

See also 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-15 → Whonix Global Firewall Settings

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

Start Menu → Applications → Settings → Global Firewall Settings

If using Non-Qubes-Whonix ™, complete this step.

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

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

Add. [6] 

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 ™ AppVM (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

Start OnionShare[edit]

To start OnionShare in Whonix-Workstation ™.

Then either run the command line interface or GUI version, depending on your preference. 

onionshare

onionshare-gui

Advanced users can also build an OnionShare package to install. [7] [8]

OnionShare Configuration[edit]

On the first run of OnionShare:

  1. Ignore the initial "Cannot connect to Tor" error which may or may not be shown. [9]
  2. Select the settings button/icon (cog symbol) in the GUI.
  3. Under “How should OnionShare connect to Tor?” choose “Connect using socket file”, and set the socket file to /var/run/tor/control
  4. Under “Tor authentication options” choose “No authentication, or cookie authentication”.

To test OnionShare is running correctly:

  • Click the “Test Settings” button. If all steps were completed correctly, Tor will successfully connect.
  • The GUI should say it supports both ephemeral onion services and stealth onion services.
  • You can check “Create stealth onion services” (Client Auth) to make OnionShare operations more secure - however, this currently only works with legacy 'v2' (shorter) style onions. Support for Client Auth with v3/prop224/next-gen onions will be possible in a future release.
    • Note: Using Stealth mode makes it harder for the end user to connect to the share, because they must first edit their torrc file. Please see the official documentation for further information.
  • By default, if the version of Tor in use is 0.3.5.7 or higher (as it is in Whonix ™), OnionShare will use next-gen or 'v3' (sometimes referred to as prop224) onion addresses by default. These are recognizable by their longer address. You can enable Legacy Mode in the settings if for some reason you want to use the shorter (but less secure) v2 onion addresses.

How to Use OnionShare[edit]

Once OnionShare has been installed correctly and the Tor check is successful, sharing files anonymously is easy: [10]

Open OnionShare, drag and drop files and folders you wish to share into it, and click Start Sharing. After a moment, it will show you a .onion URL such as http://asxmi4q6i7pajg2b.onion/egg-cain. This is the secret URL that can be used to download the file you're sharing.


Send this URL to the person you're sending the files to. If the files you're sending aren't secret, you can use normal means of sending the URL, like by emailing it, or sending it in a Facebook or Twitter private message. If you're sending secret files then it's important to send this URL securely.

The person who is receiving the files doesn't need OnionShare. All they need is to open the URL you send them in Tor Browser to be able to download the file.

As of OnionShare 2, a new feature exists 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 those users). You can read more about Receive Mode in the OnionShare wiki.

A complete user guide, along with advanced topics, hardening options [11] and development documentation is available on the official website. 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.

OnionShare AppArmor Profiles[edit]

AppArmor profiles are available to better contain OnionShare, but they have not yet been tested in Whonix ™. [12] 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 and help complete this wiki section. Successes or failures can also be reported in the Whonix ™ AppArmor forum.

TODO: Test profiles and expand this section.

Footnotes[edit]

  1. ↑ https://onionshare.org/
  2. ↑ https://github.com/micahflee/onionshare/wiki
  3. ↑ https://tracker.debian.org/pkg/onionshare
  4. ↑ 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.
  5. ↑ 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-15) and then restarting the Whonix-Gateway ™ ProxyVM or using bind-dirs. 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.
  6. ↑ As per https://labs.riseup.net/code/issues/7870#note-15 OnionShare uses ports 17600 to 17659.
  7. ↑ https://github.com/micahflee/onionshare/blob/master/BUILD.md#gnulinux
  8. ↑ To create a .deb on Debian, run: ./install/build_deb.sh
  9. ↑ Will be fixed after upgrades: https://forums.whonix.org/t/feature-request-onionshare-support/300/20
  10. ↑ https://github.com/micahflee/onionshare/wiki
  11. ↑ 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.
  12. ↑ https://github.com/micahflee/onionshare/tree/develop/apparmor

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