Update Linux/SSH/README.md
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@@ -4,8 +4,6 @@
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curl -s https://gitea.glaeser-it.de/WirFixenAlles/Boilerplates/raw/branch/main/Linux/SSH/colorscheme.sh | bash
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```
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# Erstellen einer sicheren SSH-Anmeldung
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Dieses Skript richtet OpenSSH mit sicheren Einstellungen ein und erstellt bei Bedarf Benutzer mit SSH-Zugriff.
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@@ -20,254 +18,8 @@ Das Skript erlaubt es, SSH-Zugriff nur für bestimmte Benutzer zu konfigurieren.
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---
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## Skript: Secure SSH Setup
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# Secure-SSH Setup ausführen
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```bash
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#!/bin/bash
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printf "\033c"
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SSH_CONFIG_DIR="/etc/ssh/sshd_config.d"
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SSH_MAIN_CONFIG="/etc/ssh/sshd_config"
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SSH_CONFIG_FILE="$SSH_CONFIG_DIR/secure.conf"
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ED25519_KEY="/etc/ssh/ssh_host_ed25519_key"
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ECDSA_KEY="/etc/ssh/ssh_host_ecdsa_key"
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RED='\033[1;31m'
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GREEN='\033[1;32m'
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YELLOW='\033[1;33m'
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BLUE='\033[1;34m'
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WHITE='\033[1;37m'
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RESET='\033[0m'
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log() {
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echo -e "${GREEN}$1${RESET}"
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}
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warn() {
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echo -e "${YELLOW}$1${RESET}"
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}
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error() {
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echo -e "${RED}$1${RESET}"
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}
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install_package() {
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local package=$1
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local cmd=$2
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warn "Installiere $package..."
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if eval "$cmd" &> /dev/null; then
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log "$package wurde erfolgreich installiert."
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else
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error "Fehler bei der Installation von $package."
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exit 1
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fi
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}
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if ! command -v sudo &> /dev/null; then
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warn "sudo ist nicht installiert. Versuche, sudo zu installieren..."
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if command -v apt &> /dev/null; then
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install_package "sudo" "apt update && apt install -y sudo"
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elif command -v dnf &> /dev/null; then
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install_package "sudo" "dnf install -y sudo"
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elif command -v apk &> /dev/null; then
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install_package "sudo" "apk add sudo"
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else
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error "Nicht unterstütztes System. Bitte sudo manuell installieren."
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exit 1
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fi
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else
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log "sudo ist bereits installiert."
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fi
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if ! command -v sshd &> /dev/null; then
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warn "OpenSSH-Server wird installiert..."
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if command -v apt &> /dev/null; then
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install_package "OpenSSH-Server" "sudo apt update && sudo apt install -y openssh-server"
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elif command -v dnf &> /dev/null; then
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install_package "OpenSSH-Server" "sudo dnf install -y openssh-server"
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elif command -v apk &> /dev/null; then
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install_package "OpenSSH-Server" "sudo apk add openssh"
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else
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error "Nicht unterstütztes System. Bitte OpenSSH manuell installieren."
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exit 1
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fi
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else
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log "OpenSSH-Server ist bereits installiert."
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fi
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if [ ! -f "$ED25519_KEY" ]; then
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warn "Host-Schlüssel fehlt. Generiere ssh_host_ed25519_key..."
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if sudo ssh-keygen -t ed25519 -f "$ED25519_KEY" -N "" &> /dev/null; then
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sudo chown root:root "$ED25519_KEY"
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sudo chmod 600 "$ED25519_KEY"
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log "Host-Schlüssel ssh_host_ed25519_key wurde erstellt."
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else
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error "Fehler beim Erstellen des Host-Schlüssels."
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exit 1
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fi
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else
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log "Host-Schlüssel ssh_host_ed25519_key ist bereits vorhanden."
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fi
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if [ ! -f "$ECDSA_KEY" ]; then
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warn "Host-Schlüssel fehlt. Generiere ssh_host_ecdsa_key..."
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if sudo ssh-keygen -t ecdsa -b 384 -f "$ECDSA_KEY" -N "" &> /dev/null; then
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sudo chown root:root "$ECDSA_KEY"
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sudo chmod 600 "$ECDSA_KEY"
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log "Host-Schlüssel ssh_host_ecdsa_key wurde erstellt."
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else
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error "Fehler beim Erstellen des Host-Schlüssels."
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exit 1
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fi
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else
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log "Host-Schlüssel ssh_host_ecdsa_key ist bereits vorhanden."
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fi
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sudo rm -f $SSH_CONFIG_DIR/*
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echo "Include $SSH_CONFIG_DIR/*" | sudo tee $SSH_MAIN_CONFIG > /dev/null
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echo -en "${BLUE}Welche Benutzer dürfen sich per SSH anmelden? (Benutzer durch ${WHITE}Leerzeichen${BLUE} trennen): ${RESET}"
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read SSH_USERS
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VALID_USERS=""
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# Bestimme die sudo-Gruppe abhängig von der Distribution
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if [ -f /etc/os-release ]; then
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. /etc/os-release
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case "$ID" in
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ubuntu|debian)
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SUDO_GROUP="sudo"
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;;
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centos|fedora|rhel|almalinux|rocky)
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SUDO_GROUP="wheel"
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;;
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arch|manjaro)
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SUDO_GROUP="wheel"
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;;
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*)
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SUDO_GROUP="sudo" # Fallback auf "sudo"
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;;
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esac
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else
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SUDO_GROUP="sudo" # Fallback falls os-release nicht existiert
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fi
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for user in $SSH_USERS; do
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if id "$user" &>/dev/null; then
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log "Benutzer $user existiert."
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VALID_USERS+="$user "
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else
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echo -en "${BLUE}Benutzer ${WHITE}$user${BLUE} existiert nicht. Soll dieser erstellt werden? ${YELLOW}[${WHITE}y/n${YELLOW}]${RESET}: "
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read CREATE_USER
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echo -en "${BLUE}Gib ein Passwort für ${WHITE}$user${BLUE} ein: ${RESET}"
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read -s USER_PASSWORD
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echo
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if [ "$CREATE_USER" == "y" ]; then
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if sudo adduser --disabled-password --gecos "" "$user" &>/dev/null && echo "$user:$USER_PASSWORD" | sudo chpasswd &>/dev/null && sudo usermod -aG $SUDO_GROUP "$user" &>/dev/null; then
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log "Benutzer $user wurde erstellt und zur $SUDO_GROUP-Gruppe hinzugefügt."
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sudo mkdir -p /home/$user/.ssh
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sudo touch /home/$user/.ssh/authorized_keys
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sudo chown -R $user:$user /home/$user/.ssh
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sudo chmod 700 /home/$user/.ssh
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sudo chmod 600 /home/$user/.ssh/authorized_keys
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echo -en "${BLUE}Möchtest du einen SSH Public Key für ${WHITE}$user${BLUE} hinzufügen? ${YELLOW}[${WHITE}y/n${YELLOW}]${RESET}: "
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read ADD_KEY
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if [ "$ADD_KEY" == "y" ]; then
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echo -en "${BLUE}Füge den SSH Public Key hier ein: ${RESET}"
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read SSH_KEY
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echo "$SSH_KEY" | sudo tee -a /home/$user/.ssh/authorized_keys &> /dev/null
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fi
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VALID_USERS+="$user "
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else
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error "Fehler bei der Erstellung von Benutzer $user."
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fi
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fi
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fi
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done
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warn "Erstelle SSH-Konfigurationsdatei..."
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sudo tee $SSH_CONFIG_FILE > /dev/null <<EOL
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# SSHD Config – Maximale Sicherheit (Nur IPv4)
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# Nur IPv4-Verbindungen
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AddressFamily inet
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# Standardport (22), kann bei Bedarf geändert werden
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Port 22
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# Nur Protokoll 2 zulassen (Protokoll 1 ist unsicher)
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Protocol 2
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# Host-Schlüssel (nur moderne Schlüssel)
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HostKey /etc/ssh/ssh_host_ed25519_key
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HostKey /etc/ssh/ssh_host_ecdsa_key
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# Sichere Key Exchange-Algorithmen (Kex)
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KexAlgorithms curve25519-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,diffie-hellman-group14-sha256
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# Sichere Ciphers (Chiffren)
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr
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# Sichere MAC-Algorithmen
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MACs hmac-sha2-512,hmac-sha2-256
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# Log-Einstellungen
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SyslogFacility AUTHPRIV
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LogLevel VERBOSE
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# Maximale Login-Wartezeit
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LoginGraceTime 30s
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# Root-Login verbieten
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PermitRootLogin no
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# Nur Schlüssel-Authentifizierung erlauben
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PubkeyAuthentication yes
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PasswordAuthentication no
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ChallengeResponseAuthentication no
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# PAM für zusätzliche Sicherheitsmodule verwenden
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UsePAM yes
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# X11-Weiterleitung deaktivieren (falls nicht benötigt)
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X11Forwarding no
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# Kein MOTD durch SSH (über PAM regeln)
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PrintMotd no
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# Pfad zur Authorized Keys-Datei
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AuthorizedKeysFile .ssh/authorized_keys
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# SFTP-Subsystem (Standard)
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Subsystem sftp /usr/lib/openssh/sftp-server
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# Inaktive SSH-Sitzungen überwachen und beenden
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ClientAliveInterval 300
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ClientAliveCountMax 2
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AllowUsers $VALID_USERS
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EOL
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log "Prüfe SSH-Konfiguration..."
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# Überprüfe, ob der Dienst 'ssh' oder 'sshd' existiert und starte ihn
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if systemctl list-units --type=service | grep -q "ssh"; then
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SERVICE_NAME="ssh"
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elif systemctl list-units --type=service | grep -q "sshd"; then
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SERVICE_NAME="sshd"
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else
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error "Kein SSH-Dienst gefunden."
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exit 1
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fi
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if sudo systemctl restart $SERVICE_NAME; then
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log "SSH-Dienst erfolgreich neu gestartet."
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else
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error "Fehler beim Neustart des SSH-Dienstes."
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exit 1
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fi
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log "Setup abgeschlossen! Nur folgende Benutzer dürfen sich per SSH anmelden: ${WHITE}$VALID_USERS"
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curl -s https://gitea.glaeser-it.de/WirFixenAlles/Boilerplates/raw/branch/main/Linux/SSH/secure_ssh.sh | bash
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||||
```
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