109 lines
5 KiB
Bash
109 lines
5 KiB
Bash
#!/usr/bin/env bash
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# @file Chezmoi-Age Secret Decryption
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# @brief Ensures `age` is installed and then decrypts the `home/key.txt.age` file so that Chezmoi can utilize encrypted files
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# @description
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# This script begins by ensuring `age` is installed, the defualt program Chezmoi utilizes for handling encryption.
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# The script then allows you to generate the decrypted `~/.config/age/chezmoi.txt` file by prompting you for the password
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# to `home/key.txt.age` which is the encrypted encryption key file for using Chezmoi to add encrypted files to your Install
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# Doctor fork. If no password is passed to the decryption password prompt, then all of the `encrypted_` files in the fork
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# are deleted so that Chezmoi does not try to decrypt files without a decryption key file.
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#
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# ## Headless Installs
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#
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# If you do not want the script to prompt you for a password, then you can pass in an environment variable with
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# `HEADLESS_INSTALL=true`. This variable ensures that nothing requiring input from the user blocks the provisioning process.
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# If you want to automate a headless install that requires access to `encrypted_` files and encrypted variables, then
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# you can save the decrypted Age key to `~/.config/age/chezmoi.txt` prior to running `bash <(curl -sSL https://install.doctor/start)`.
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#
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# Alternatively, you can pass in your Age decryption passphrase in using the `AGE_PASSWORD` environment variable.
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# Install Doctor will use this variable along with expect to headlessly automate the password prompt during the
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# decryption process.
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#
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# ## GPG
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#
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# It is also possible to configure Chezmoi to utilize GPG instead of Age. This might be beneficial if you want to
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# use a smart card / YubiKey for hardware-backed encryption. Otherwise, Age is a great encryption tool.
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#
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# ## Notes
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#
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# _It is possible that hardware-based smart-card-like GPG encryption might not work properly with Chezmoi yet.
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# Learned this by attempting to use a YubiKey GPG setup using [this guide](https://github.com/drduh/YubiKey-Guide) and trying to get it to work with Chezmoi._
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{{ includeTemplate "universal/logg-before" }}
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{{ includeTemplate "universal/profile-before" }}
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### Handle decryption failure
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decryptionFailure() {
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logg info 'Proceeding without decrypting age encryption key stored at ~/.local/share/chezmoi/home/key.txt.age'
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logg info 'To have Chezmoi handle your encryption (so you can store your private files publicly) take a look at https://shorturl.at/jkpzG'
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logg info 'Removing all files that begin with encrypted_ because decryption failed'
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find "${XDG_DATA_HOME:-$HOME/.local/share}/chezmoi" -type f -name "encrypted_*" | while read ENCRYPTED_FILE; do
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logg info "Removing $ENCRYPTED_FILE"
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rm -f "$ENCRYPTED_FILE"
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done
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}
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### Install Age via Homebrew if not present
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installAge() {
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if ! command -v age > /dev/null; then
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logg info 'Running brew install age'
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brew install --quiet age
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fi
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}
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### Install Expect via Homebrew if not present
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installExpect() {
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if ! command -v expect > /dev/null; then
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logg info 'Running brew install expect'
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brew install --quiet expect
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fi
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}
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### Decrypt private key if it is not already present
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decryptKey() {
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if command -v age > /dev/null; then
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if [ ! -f "${XDG_CONFIG_HOME}/age/chezmoi.txt" ]; then
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mkdir -p "${XDG_CONFIG_HOME}/age"
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if [ -z "$AGE_PASSWORD" ]; then
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logg star 'PRESS ENTER if you have not set up your encryption token yet'
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age --decrypt --output "${XDG_CONFIG_HOME}/age/chezmoi.txt" "{{ .chezmoi.sourceDir }}/key.txt.age" || EXIT_CODE=$?
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if [ -n "$EXIT_CODE" ]; then
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decryptionFailure
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else
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logg success 'The encryption key was successfully decrypted'
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fi
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else
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installExpect
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expect -c "set timeout -1
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spawn age --decrypt --output "${XDG_CONFIG_HOME}/age/chezmoi.txt" "${XDG_DATA_HOME:-$HOME/.local/share}/chezmoi/home/key.txt.age"
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expect \"Enter passphrase:\"
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send \"${AGE_PASSWORD}\r\"
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expect eof" &> /dev/null || EXIT_CODE=$?
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if [ -n "$EXIT_CODE" ]; then
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logg info 'There was an issue decrypting the key.txt.age file with the provided AGE_PASSWORD'
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decryptionFailure
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else
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logg info 'The encryption key was successfully decrypted using expect and the provided AGE_PASSWORD'
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fi
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fi
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fi
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fi
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}
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### Only run decryption process if HEADLESS_INSTALL variable is not set
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if [ -z "$HEADLESS_INSTALL" ]; then
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installAge
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decryptKey
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elif [ -n "$HEADLESS_INSTALL" ] && [ -n "$AGE_PASSWORD" ]; then
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installAge
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decryptKey
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else
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logg info 'Skipping Age key decryption process - HEADLESS_INSTALL and AGE_PASSWORD should be passed in as env variables to automate the process'
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fi
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### Ensure proper permissions on private key
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if [ -f "${XDG_CONFIG_HOME}/age/chezmoi.txt" ]; then
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logg info 'Ensuring proper permissions on Chezmoi / age decryption key'
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logg info 'Chezmoi / age decryption key is stored in '"${XDG_CONFIG_HOME}/age/chezmoi.txt"
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chmod 600 "${XDG_CONFIG_HOME}/age/chezmoi.txt"
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fi
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