107 lines
2.3 KiB
Bash
Executable File
107 lines
2.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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GREEN_CHECK="\e[32m✔\e[0m"
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RED_X="\e[31m✗\e[0m"
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#
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# Function Definition
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#
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ssh_config_val() {
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local field="$1"
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local val
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if [[ -z "$field" ]]; then
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echo "usage: ssh_config_val <config name>" >&2
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return 2
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fi
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echo $(sshd -T | grep -i "^$field " | head -1 | awk '{print $2}')
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}
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green_checkmark() {
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printf "\e[32m✔\e[0m"
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}
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check_ssh_files() {
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printf "%-6s %-20s %-6s %s\n" "STATUS" "KEY" "PERMS" "PATH"
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for key in hostkey hostcertificate trustedusercakeys; do
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path=$(ssh_config_val "$key")
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if [[ -z "$path" ]]; then
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printf "%-7s %-20s %-6s %s\n" "⚠️" "$key" "-" "(not configured)"
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continue
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fi
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if [[ -e "$path" ]]; then
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perms=$(stat -c '%a' "$path")
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printf "%-17b %-20s %-6s %s\n" " $GREEN_CHECK" "$key" "$perms" "$path"
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else
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printf "%-17b %-20s %-6s %s\n" " $RED_X" "$key" "-" "$path (missing)"
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fi
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done
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}
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ssh_fingerprint() {
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local field="$1"
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local ca_path
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if [[ -z "$field" ]]; then
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echo "usage: ssh_fingerprint <trusteduserca|hostcertificate|...>" >&2
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return 2
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fi
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cfg_path=$(ssh_config_val $field)
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if [[ -z "$cfg_path" ]]; then
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echo "error: sshd field '$field' not found or empty" >&2
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return 1
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fi
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if [[ ! -r "$cfg_path" ]]; then
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echo "error: file not readable: $cfg_path" >&2
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return 1
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fi
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ssh-keygen -lf "$cfg_path" | awk '{ print $2 }'
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}
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install_cert_config() {
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local base_dir="/etc/ssh/sshd_config.d"
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local cfg_path="${1:-$base_dir/certs.conf}"
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mkdir -p $(dirname $cfg_path)
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cat <<EOF > $cfg_path
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TrustedUserCAKeys /etc/ssh/ssh_user_ca.pub
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HostKey /etc/ssh/ssh_host_ed25519_key
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HostCertificate /etc/ssh/ssh_host_ed25519_key-cert.pub
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EOF
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}
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#
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# Run Process
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#
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if [[ ! -e "/etc/ssh/sshd_config.d/certs.conf" ]]; then
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echo "⚠️ sshd not configured to use SSH certs"
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read -p "Do you want to configure sshd? (y/n) " -n 1 -r
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echo
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if [[ $REPLY =~ ^[Yy]$ ]]; then
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install_cert_config
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echo -n "Restarting sshd... "
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systemctl restart sshd
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echo "done"
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else
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echo "Exiting"
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exit 1
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fi
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fi
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check_ssh_files
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echo ""
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echo "Host certificate fingerprint"
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ssh_fingerprint hostkey
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