138 lines
5.3 KiB
Bash
Executable File
138 lines
5.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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echo -e "
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Before using this tool, ensure that the host has been setup correctly.
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Boot the latest Nixos-minimal install ISO on the host and access the tty.
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Use 'ip a' to get the ip address, then 'sudo su' to change to root. Finally
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Run 'passwd' and set a temporary password (something simple like '1234')
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for the root user.
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"
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read -p "Confirm host had been setup using the above steps...(yes|no): " confirm
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[ "$confirm" != "yes" ] && echo "Exiting" && exit 0
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# Target host details
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cd ~
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read -p "Enter hostname: " hostname
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read -p "Enter username: " username
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read -p "Enter ip address: " ip
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read -p "Enter nixosSystem to build, e.g. 'bootstrap': " config
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# Generate key name and dir
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KEY_DIR="$HOME/keys/$hostname/"
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mkdir -p $KEY_DIR
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KEY_NAME="$username@$hostname-ssh-ed25519"
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# Delete key in known hosts if exists
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confirm_delete=""
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KNOWN_HOSTS=$(grep "$ip" ~/.ssh/known_hosts)
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[ "$KNOWN_HOSTS" != "" ] && echo -e "Host found in: ~/.ssh/known_hosts\n\n$KNOWN_HOSTS\n" && read -p "Delete existing hosts from ~/.ssh/known_hosts? (yes|no) " confirm_delete
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[ "$confirm_delete" = "yes" ] && sed -i "/$ip/d" ~/.ssh/known_hosts
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# Generate new keys for target host if not exists
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echo "Creating ssh keys for new host."
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overwrite=""
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[ -f "$KEY_DIR/$KEY_NAME" ] && read -p "Target host key '$KEY_NAME' already exists, would you like to overwrite it? (yes|no) " overwrite
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[ -z "$overwrite" ] || [ "$overwrite" == "yes" ] && ssh-keygen -t ed25519 -f "$KEY_DIR/$KEY_NAME" -C "$username@$hostname" -N ""
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# Authorise source public key
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echo "Copying pubkey to target host"
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ssh-copy-id -i "$(readlink -f "$HOME/.ssh/ssh_host_ed25519_key.pub")" "root@$ip"
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# Generate age key from target host public ssh key
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echo "Generating age key from target host ssh key"
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nix-shell -p ssh-to-age --run "cat $KEY_DIR/$KEY_NAME.pub | ssh-to-age > $KEY_DIR/age_key_$hostname"
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[ $? != 0 ] && echo "Error generating age key" && exit 1
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AGE_KEY=$(cat "$KEY_DIR/age_key_$hostname")
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echo -e "Age key:\n$AGE_KEY\n"
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echo "This key needs to be inserted into .sops.yaml file. This will be prompted again later."
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# Install Nixos to target
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cd "$HOME/nixos"
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SHELL=/bin/sh nix run github:nix-community/nixos-anywhere -- --flake .#"$config" root@"$ip" -i "$HOME/.ssh/ssh_host_ed25519_key"
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[ $? != 0 ] && echo "Error installing Nixos" && exit 1
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## Delete keys from local known_hosts
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echo "Deleting host from known_hosts"
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sed -i "/$ip/d" ~/.ssh/known_hosts
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# Check host OS has booted (and not booted back into live cd)
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while true;
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do
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read -p "Confirm live CD has been removed... (yes|no): " confirm
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[ "$confirm" = "yes" ] && break
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done
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echo "Waiting for $ip to come back online and port 22 to be open..."
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while ! ping -c 1 $ip &> /dev/null || ! nc -zvw3 $ip 22 &> /dev/null
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do
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echo "$ip is still offline or port 22 is not open. Checking again in 5 seconds..."
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sleep 5
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done
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echo "$ip is now online and port 22 is open!"
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# Authorise source public key
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echo "Copying pubkey to target host"
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ssh-copy-id -i "$(readlink -f "$HOME/.ssh/ssh_host_ed25519_key.pub")" "$username@$ip"
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# Copy deploy_key to target for personal repo authorisation
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scp -i "$(readlink -f "$HOME/.ssh/ssh_host_ed25519_key")" "$(readlink -f "$HOME/.ssh/deploy_key-ssh-ed25519")" "media@$ip:~/.ssh/deploy_key-ssh-ed25519"
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scp -i "$(readlink -f "$HOME/.ssh/ssh_host_ed25519_key")" "$(readlink -f "$HOME/.ssh/deploy_key-ssh-ed25519.pub")" "media@$ip:~/.ssh/deploy_key-ssh-ed25519.pub"
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# Copy previously generated ssh keys
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scp -i "$(readlink -f "$HOME/.ssh/ssh_host_ed25519_key")" "$KEY_DIR/$KEY_NAME" "media@$ip:~/.ssh/ssh_host_ed25519_key"
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scp -i "$(readlink -f "$HOME/.ssh/ssh_host_ed25519_key")" "$KEY_DIR/$KEY_NAME.pub" "media@$ip:~/.ssh/ssh_host_ed25519_key.pub"
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echo "Configuring target host ssh connection to enable connection to gitea repos:"
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read -r -d '' config << EOM
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Host git.bitlab21.com
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IdentitiesOnly yes
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StrictHostKeyChecking no
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IdentityFile ~/.ssh/deploy_key-ssh-ed25519
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EOM
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echo "$config" | ssh "$username@$ip" 'mkdir -p ~/.ssh/ && cat > ~/.ssh/config'
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echo -e "
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Complete!
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Now add the new target host age key to .sops.yaml. This is needed to enable the
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new host to decrypt the secrets.yaml file from the ssh key we generated
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previously.
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Enter the details as following:
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keys:
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- &hosts:
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- &$hostname $AGE_KEY
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creation_rules:
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- path_regex: secrets.yaml$
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key_groups:
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- age:
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- *$hostname
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Then update (i.e. re-encrypt) the secrets.yaml file with the new keys, run:
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'sops --config .sops.yaml updatekeys secrets.yaml'
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or with just:
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'just update-sops-secrets'
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Then commit and push these changes to remote so they can be accessed on the new
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host.
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"
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while true;
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do
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read -p "Confirm keys have been added to .sops.yaml using the above steps, and the changes (if any) have been commited and pushed...(yes|no): " confirm
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[ "$confirm" = "yes" ] && break
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done
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ssh -i "$(readlink -f "$HOME/.ssh/ssh_host_ed25519_key")" "$username@$ip" "nix-shell -p git --run 'git clone git@git.bitlab21.com:sam/nixos.git'"
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ssh -i "$(readlink -f "$HOME/.ssh/ssh_host_ed25519_key")" "$username@$ip" "nix-shell -p git --run 'git clone git@git.bitlab21.com:sam/nix-secrets.git'"
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echo "Successfully installed Nixos on the target host!"
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echo "Please remote into the new host and run 'sudo nixos-generate-config && cp /etc/nixos/hardware-configuration.nix /home/$username/nixos/hosts/$hostname/'"
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