Generate unique ssh keys for each container (issue #32)

Dockerfile

@@ -5,8 +5,11 @@ RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get -y install openssh-server && \
     rm -rf /var/lib/apt/lists/*
 
-# sshd needs this directory to run
-RUN mkdir -p /var/run/sshd
+# Step 1: sshd needs /var/run/sshd/ to run
+# Step 2: Remove keys, they will be generated later by entrypoint
+#         (unique keys for each container)
+RUN mkdir -p /var/run/sshd && \
+    rm /etc/ssh/ssh_host_*key*
 
 COPY sshd_config /etc/ssh/sshd_config
 COPY entrypoint /

entrypoint

@@ -1,5 +1,6 @@
 #!/bin/bash
 set -e
+export DEBIAN_FRONTEND=noninteractive
 
 userConfPath="/etc/sftp-users.conf"
 userConfFinalPath="/var/run/sftp-users.conf"
@@ -115,6 +116,9 @@ if [ ! -f "$userConfFinalPath" ]; then
         createUser "$user"
     done < "$userConfFinalPath"
 
+    # Generate unique ssh keys for this container
+    dpkg-reconfigure openssh-server
+
     # Source custom scripts, if any
     if [ -d /etc/sftp.d ]; then
         for f in /etc/sftp.d/*; do