Add generate_ssh_key_and_cert.sh
This script generates a ssh key that is signed by a CA key to be used for certificate-based-authentication to an sshd server. See the CERTIFICATES section in the ssh-keygen man-page.
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generate_ssh_key_and_cert.sh
Executable file
177
generate_ssh_key_and_cert.sh
Executable file
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#!/usr/bin/env bash
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# This script generates a rsa/ed25519 ssh key signed by a CA key (the CA key
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# must be on the machine or the CA key's public key can be specified and
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# ssh-agent will be used to sign with the CA key).
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# Set this to 0 to disable use of gpg-agent.
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GPG_AGENT_ENABLED=1
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CA_KEY_THROUGH_SSH_AGENT=0
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CA_KEY_PATH=""
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USER_KEY_RSA=0
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USER_KEY_ED25519=0
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USER_KEY_NAME=""
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USER_KEY_IDENTIFIER="temp_key"
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USER_KEY_USER_NAME=""
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USER_KEY_EXPIRE_TIME="+15m"
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read -p "Set key identifier? (Default \"temp_key\") [y/N]> " user_input
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if [[ -n "$user_input" ]] && [[ "$user_input" == [yY] ]]; then
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read -e -p "Specify key identifier: > " user_input
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USER_KEY_IDENTIFIER="$user_input"
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if [[ -z "$USER_KEY_IDENTIFIER" ]]; then
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echo "ERROR: Empty string cannot be used as identifier."
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exit 1
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fi
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fi
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echo "Using key identifier \"$USER_KEY_IDENTIFIER\"."
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read -p "Set expire time? (default \"$USER_KEY_EXPIRE_TIME\") [y/N]> " user_input
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if [[ -n "$user_input" ]] && [[ "$user_input" == [yY] ]]; then
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read -p "Specify expire time: > " user_input
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USER_KEY_EXPIRE_TIME="$user_input"
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if [[ -z "$USER_KEY_EXPIRE_TIME" ]]; then
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echo "ERROR: Empty string cannot be used for expire time."
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exit 1
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fi
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echo "Expire time set to \"$USER_KEY_EXPIRE_TIME\"."
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fi
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read -e -p "Specify user name to identify for (prinicpal(s)): > " user_input
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if [[ -z "$user_input" ]]; then
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echo "ERROR: Cannot specify empty string for user name!"
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exit 1
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else
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USER_KEY_USER_NAME="$user_input"
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fi
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echo "Using \"$USER_KEY_USER_NAME\" in cert principals."
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read -p "Use CA key through ssh-agent? [y/N]> " user_input
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if [[ -n "$user_input" ]] && [[ "$user_input" == [yY] ]]; then
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CA_KEY_THROUGH_SSH_AGENT=1
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echo "Using CA key through ssh-agent."
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while true; do
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read -e -p "Specify the CA public key> " user_input
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if [[ -r $user_input ]]; then
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CA_KEY_PATH="$user_input"
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echo "Using \"$CA_KEY_PATH\" as CA public key."
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break
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else
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echo "ERROR: \"$user_input\" doesn't exist!"
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fi
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done
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else
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while true; do
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read -e -p "Specify the CA key> " user_input
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if [[ -r $user_input ]]; then
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CA_KEY_PATH="$user_input"
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echo "Using \"$CA_KEY_PATH\" as CA key."
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break
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else
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echo "ERROR: \"$user_input\" doesn't exist!"
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fi
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done
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fi
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USING_EXISTING_KEY=0
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while true; do
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read -p "Use existing key? [y/N]> " user_input
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if [[ "$user_input" == [yY] ]]; then
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USING_EXISTING_KEY=1
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break;
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else
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break;
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fi
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done
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unset EXISTING_PUBKEY_PATH
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while (( USING_EXISTING_KEY )); do
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read -e -p "Specify the path to the key's pubkey> " user_input
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if [[ -r "$user_input" ]]; then
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EXISTING_PUBKEY_PATH="$user_input"
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echo "Using existing key \"$EXISTING_PUBKEY_PATH\""
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break;
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fi
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done
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if [[ -z "$EXISTING_PUBKEY_PATH" ]]; then
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while true; do
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read -p "Generate RSA or ED25519 key? [r/e]> " user_input
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if [[ "$user_input" == [rR] ]]; then
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USER_KEY_RSA=1
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echo "Using RSA."
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break
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elif [[ "$user_input" == [eE] ]]; then
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USER_KEY_ED25519=1
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echo "Using ED25519."
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break
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fi
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done
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while true; do
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read -p "Specify key name: > " user_input
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if [[ -n "$user_input" ]]; then
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USER_KEY_NAME="$user_input"
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echo "Using key name \"$USER_KEY_NAME\"."
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break
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fi
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done
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if (( USER_KEY_RSA )); then
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echo ssh-keygen -t rsa -b 4096 -a 100 -o -f "$USER_KEY_NAME"
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ssh-keygen -t rsa -b 4096 -a 100 -o -f "$USER_KEY_NAME"
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elif (( USER_KEY_ED25519 )); then
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echo ssh-keygen -t ed25519 -a 100 -o -f "$USER_KEY_NAME"
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ssh-keygen -t ed25519 -a 100 -o -f "$USER_KEY_NAME"
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else
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echo "ERROR: Neither RSA nor ED25519 specified!"
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exit 1
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fi
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if [[ ! -r "$USER_KEY_NAME" ]] || [[ ! -r "${USER_KEY_NAME}.pub" ]]; then
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echo "ERROR: Neither \"$USER_KEY_NAME\" nor \"${USER_KEY_NAME}.pub\" exists!"
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exit 1
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fi
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fi
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if [[ -z "$USER_KEY_NAME" ]] && [[ -n "$EXISTING_PUBKEY_PATH" ]]; then
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USER_PUBKEY_NAME="$EXISTING_PUBKEY_PATH"
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elif [[ -z "$USER_KEY_NAME" ]]; then
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echo "ERROR: Key not generated nor existing key specified!"
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exit 1
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else
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USER_PUBKEY_NAME="${USER_KEY_NAME}.pub"
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fi
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if (( CA_KEY_THROUGH_SSH_AGENT )) && [[ -r "$CA_KEY_PATH" ]]; then
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(( GPG_AGENT_ENABLED )) && gpg-connect-agent updatestartuptty /bye >&/dev/null
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ssh-keygen -Us "$CA_KEY_PATH" -I "$USER_KEY_IDENTIFIER" -V "$USER_KEY_EXPIRE_TIME" -n "$USER_KEY_USER_NAME" "${USER_PUBKEY_NAME}"
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if (( $? != 0 )); then
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echo "ERROR: Failed to sign certificate!"
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exit 1
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fi
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elif [[ -r "$CA_KEY_PATH" ]]; then
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(( GPG_AGENT_ENABLED )) && gpg-connect-agent updatestartuptty /bye >&/dev/null
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ssh-keygen -s "$CA_KEY_PATH" -I "$USER_KEY_IDENTIFIER" -V "$USER_KEY_EXPIRE_TIME" -n "$USER_KEY_USER_NAME" "${USER_PUBKEY_NAME}"
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if (( $? != 0 )); then
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echo "ERROR: Failed to sign certificate!"
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exit 1
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fi
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else
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echo "ERROR: Invalid settings for CA key!"
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exit 1
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fi
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echo Done.
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if [[ -z "$USER_KEY_NAME" ]] && [[ -n "$USER_PUBKEY_NAME" ]]; then
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if echo "$USER_PUBKEY_NAME" | grep '\.pub$' >&/dev/null; then
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USER_KEY_NAME="$(echo -n "$USER_PUBKEY_NAME" | sed 's/\.pub$//')"
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fi
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fi
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echo "Hint: Use ssh -o CertificateFile=${USER_KEY_NAME:-key}-cert.pub -i ${USER_KEY_NAME:-key} host"
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