init

Dockerfile

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+FROM debian:10
+
+WORKDIR /app
+
+RUN addgroup eleve
+
+RUN apt-get update && apt-get install -y \
+  ssh \
+  && rm -rf /var/lib/apt/lists/*
+
+
+ENV TZ=Europe/Paris
+
+#CMD ["sh", "-c", "echo lol"]
+
+# SSH server
+RUN mkdir /run/sshd
+CMD ["/usr/sbin/sshd", "-E", "/dev/stderr", "-D"]
+
+# Entrypoint
+COPY ./entrypoint.sh ./entrypoint.sh
+ENTRYPOINT ["./entrypoint.sh"]

docker-compose.yml

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+version: '3'
+services:
+    app:
+        build: .
+        volumes:
+            - ./config:/app/config
+            - ./home_eleves:/home
+        network_mode: "host"
+        restart: "unless-stopped"

entrypoint.sh

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+#!/bin/sh
+
+HOME_BASE="/home"
+USERS_LIST="/app/config/users.txt"
+PASSWD_LIST="/app/config/passwords.txt"
+CUSTOM_SCRIPT="/app/config/init.sh"
+
+separator="=" # Must be ascii for cut
+forbidden_chars=". / : # = \ "
+
+# Check we got user list
+if [ ! -f "$USERS_LIST" ] && [ ! -f "$PASSWD_LIST" ] ; then
+    echo "Les fichiers des utilisateurs ou des passwords n’ont pas étés trouvées."
+    exit 1
+fi
+
+for c in $forbidden_chars ; do
+    if [ -n "$(cat "$USERS_LIST" | grep -F $c)" ] ; then
+        echo "Le fichier « $USERS_LIST » ne doit pas contenir le caractère « $c » !"
+        exit 1
+    fi
+done
+
+echo "-------------------------------------------------------------"
+echo " Create users (and passwords if needed) as in $USERS_LIST"
+# Generate passwords if not done yet
+genPassowrd () {
+    tr -dc A-Za-z0-9 </dev/urandom | head -c $1
+}
+if [ ! -e "$PASSWD_LIST" ] ; then
+    touch "$PASSWD_LIST"
+fi
+for user in $(cat "$USERS_LIST") ; do
+    if [ -z "$user" ] || [ -n "$(cat $PASSWD_LIST | grep "$user$separator")" ] ; then continue ; fi
+    echo "$user$separator$(genPassowrd 6)" >> $PASSWD_LIST
+done
+
+for line in $(cat $PASSWD_LIST) ; do
+    name="$(echo "$line" | cut -d "$separator" -f 1)"
+    pass="$(echo "$line" | cut -d "$separator" -f 2)"
+    echo $name $pass
+    if [ -z "$name" ] || [ -z "$pass" ] ; then echo "Malformed line skipped: '$line'" ; continue ; fi
+    home="$HOME_BASE/$name"
+    mkdir -p "$home"
+    chmod 700 "$home"
+    useradd --home-dir "$home" --no-user-group -G eleve --shell /bin/bash "$name"
+    ret="$?"
+    if [ "$ret" -ne 0 ] && [ "$ret" -ne 9 ] ; then
+        echo "Can’t create user '$name'. Error '$ret'."
+        continue
+    fi
+    echo "$pass\n$pass" | passwd "$name" >/dev/null 2>/dev/null
+    chown "$name":eleve "$home"
+done
+
+
+echo "-------------------------------------------------------------"
+echo " Allow SSH as root"
+if [ -z "$(grep '^PermitRootLogin yes' /etc/ssh/sshd_config)" ] ; then
+    echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
+fi
+
+echo "-------------------------------------------------------------"
+echo " Setting root password"
+echo "root\nroot" | passwd 2>/dev/null >/dev/null
+
+
+echo "-------------------------------------------------------------"
+echo " Running main process"
+exec "$@"