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195 lines
5.9 KiB
Markdown
195 lines
5.9 KiB
Markdown
<!--
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Title: How to audit source code of proprietary Electron app
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Description: Learn how to audit source code of proprietary Electron app.
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Author: Sun Knudsen <https://github.com/sunknudsen>
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Contributors: Sun Knudsen <https://github.com/sunknudsen>
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Reviewers:
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Publication date: 2021-12-03T19:50:28.298Z
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Listed: true
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Pinned:
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-->
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# How to audit source code of proprietary Electron app
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[](https://www.youtube.com/watch?v=s4S7qgCkVCc "How to audit source code of proprietary Electron app")
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## Requirements
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- Computer running macOS Big Sur or Monterey or disposable [Tails USB flash drive or SD card](../how-to-install-tails-on-usb-flash-drive-or-sd-card)
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## Caveats
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- When copy/pasting commands that start with `$`, strip out `$` as this character is not part of the command
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## macOS guide
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### Step 1: install [Homebrew](https://brew.sh/)
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```console
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$ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
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$ uname -m | grep arm64 && echo 'export PATH=$PATH:/opt/homebrew/bin' >> ~/.zshrc && source ~/.zshrc
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```
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### Step 2: disable Homebrew analytics
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```shell
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brew analytics off
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```
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### Step 3: install dependencies
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```shell
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brew install node tree
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```
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### Step 4: extract source code
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> Heads-up: replace `QR\ Bridge.app` with Electron app one wishes to audit.
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```console
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$ npx asar extract /Applications/QR\ Bridge.app/Contents/Resources/app.asar ~/Desktop/source
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npx: installed 17 in 6.041s
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```
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### Step 5 (optional): list files
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```console
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$ tree ~/Desktop/source -I node_modules
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/Users/sunknudsen/Desktop/source
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├── LICENSE
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├── README.md
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├── app
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│ ├── confirmation.wav
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│ ├── index.html
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│ ├── preload.js
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│ ├── renderer.js
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│ └── style.css
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├── icon.ai
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├── main.js
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├── package.json
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└── qr-bridge.code-workspace
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1 directory, 11 files
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```
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### Step 6: audit app
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> Heads-up: `code` is a command line utility that opens file or folder in [Visual Studio Code](https://code.visualstudio.com/).
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> Heads-up: **please respect license**… being able to audit app does not mean app (including its source code) should be considered public domain.
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```shell
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code ~/Desktop/source
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```
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### Step 7: check if app calls home
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Use application-layer firewall such as [Little Snitch](https://www.obdev.at/products/littlesnitch/index.html) or [Lulu](https://objective-see.com/products/lulu.html).
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👍
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## Tails guide
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### Step 1: boot to Tails and set admin password (required to run commands using `sudo`)
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> Heads-up: if keyboard layout of computer isn’t “English (US)”, set “Keyboard Layout”.
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Click “+” under “Additional Settings”, then “Administration Password”, set password, click “Add” and, finally, click “Start Tails”.
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### Step 2: import [Node.js](https://nodejs.org/en/)’s PGP public key
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```shell
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torsocks curl -fsSL https://deb.nodesource.com/gpgkey/nodesource.gpg.key | gpg --dearmor | sudo tee /usr/share/keyrings/nodesource.gpg > /dev/null
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```
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### Step 3: enable Node.js’s repository
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> Heads-up: run `cat /etc/debian_version` to find Debian version.
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#### Debian 10 (buster)
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```console
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$ echo -e "deb [signed-by=/usr/share/keyrings/nodesource.gpg] tor+https://deb.nodesource.com/node_16.x buster main\ndeb-src [signed-by=/usr/share/keyrings/nodesource.gpg] tor+https://deb.nodesource.com/node_16.x buster main" | sudo tee /etc/apt/sources.list.d/nodesource.list > /dev/null
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$ sudo apt update
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```
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#### Debian 11 (bullseye)
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```console
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$ echo -e "deb [signed-by=/usr/share/keyrings/nodesource.gpg] tor+https://deb.nodesource.com/node_16.x bullseye main\ndeb-src [signed-by=/usr/share/keyrings/nodesource.gpg] tor+https://deb.nodesource.com/node_16.x bullseye main" | sudo tee /etc/apt/sources.list.d/nodesource.list > /dev/null
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$ sudo apt update
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```
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### Step 4: find Node.js version
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```console
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$ sudo apt-cache madison nodejs
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nodejs | 16.13.1-deb-1nodesource1 | tor+https://deb.nodesource.com/node_16.x buster/main amd64 Packages
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nodejs | 12.22.7~dfsg-2 | tor+https://cdn-fastly.deb.debian.org/debian sid/main amd64 Packages
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nodejs | 12.22.5~dfsg-2~11u1 | tor+https://cdn-fastly.deb.debian.org/debian bullseye/main amd64 Packages
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nodejs | 10.24.0~dfsg-1~deb10u1 | tor+https://cdn-fastly.deb.debian.org/debian buster/main amd64 Packages
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nodejs | 10.24.0~dfsg-1~deb10u1 | tor+https://cdn-fastly.deb.debian.org/debian-security buster/updates/main amd64 Packages
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```
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### Step 5: install dependencies
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> Heads-up: replace `nodejs=16.13.1-deb-1nodesource1` with version found at [step 4](#step-4-find-nodejs-version).
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```shell
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sudo apt install -y nodejs=16.13.1-deb-1nodesource1 tree
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```
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### Step 6: extract “resources” directory from AppImage
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> Heads-up: replace `qr-bridge.AppImage` with Electron app one wishes to audit.
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```console
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$ ./qr-bridge.AppImage --appimage-extract resources
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squashfs-root/resources
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squashfs-root/resources/app-update.yml
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squashfs-root/resources/app.asar
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```
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### Step 7: extract source code
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> Heads-up: ignore torsocks warnings (if present).
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```console
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$ torsocks npx asar extract squashfs-root/resources/app.asar ~/Desktop/source
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Need to install the following packages:
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asar
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Ok to proceed? (y) y
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```
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### Step 8 (optional): list files
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```console
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$ tree ~/Desktop/source -I node_modules
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/home/amnesia/Desktop/source
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├── app
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│ ├── confirmation.wav
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│ ├── index.html
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│ ├── preload.js
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│ ├── renderer.js
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│ └── style.css
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├── icon.ai
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├── LICENSE
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├── main.js
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├── package.json
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├── qr-bridge.code-workspace
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└── README.md
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1 directory, 11 files
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```
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### Step 9: audit app
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> Heads-up: **please respect license**… being able to audit app does not mean app (including its source code) should be considered public domain.
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Audit source code using “Text Editor”.
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👍
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