add support for creation of user/groups

README.md

@@ -2,6 +2,7 @@
 
 * Debian slim based image
 * OpenSSH server
+* User/group creation on startup
 
 # Supported tags and respective `Dockerfile` links
 
@@ -14,6 +15,9 @@
 | Key | Format | Description |
 | --- | --- | --- |
 | `ROOT_AUTHORIZED_KEYS` | `/path/to/file` | Path to file that contains the public SSH keys that can be used for root user authentication. This file will be copied to `/root/.ssh/authorized_keys` |
+| `USERADD` | `{username}:{uid}:{gid};...` | Create user account(s) on startup |
+| `GROUPADD` | `{groupname}:{gid};...` | Create group account(s) on startup |
+| `BASE_DIR` | `/home` | Basedir used for user account creation (Default: `/home`) |
 
 ## docker run
 
@@ -22,6 +26,8 @@ $ docker run -it \
     --name jumpbox \
     -v $(pwd)/jumpbox:/var/lib/jumpbox \
     -e "ROOT_AUTHORIZED_KEYS=/var/lib/jumpbox/authorized_keys"
+    -e "USERADD=jumpbox:1000:1000"
+    -e "GROUPADD=jumpbox:1000"
     -p 1022:22 \
     pommib/jumpbox:latest
 ```
@@ -41,4 +47,6 @@ services:
       - '${PWD}/jumpbox:/var/lib/jumpbox'
     environment:
       ROOT_AUTHORIZED_KEYS: /var/lib/jumpbox/authorized_keys
+      USERADD: jumpbox:1000:1000
+      GROUPADD: jumpbox:1000
 ```

start.sh

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -ex
+
 mkdir -p /run/sshd
 
 if [ -n "$ROOT_AUTHORIZED_KEYS" ]; then
@@ -10,4 +12,37 @@ if [ -n "$ROOT_AUTHORIZED_KEYS" ]; then
     fi
 fi
 
+if [ -z "$BASE_DIR" ]; then
+    BASE_DIR="/home"
+fi
+
+if [ ! -d "$BASE_DIR" ]; then
+    echo "BASE_DIR $BASE_DIR does not exist, creating..."
+    mkdir -p $BASE_DIR
+fi
+
+# GROUPADD="group1:1000;group2:1001;group3:1002"
+while [ "$GROUPADD" != "$i" ] ;do
+    i=${GROUPADD%%;*}
+    GROUPADD="${GROUPADD#$i;}"
+
+    GROUP_NAME=${i%%:*}
+    GROUP_GID="${i#$GROUP_NAME:}"
+
+    groupadd --gid "$GROUP_GID" "$GROUP_NAME"
+done
+
+# USERADD="user1:1000:1000;user2:1001:1000;user3:1002:1002"
+while [ "$USERADD" != "$i" ] ;do
+    i=${USERADD%%;*}
+    USERADD="${USERADD#$i;}"
+
+    USER_NAME=${i%%:*}
+    UID_GID="${i#$USER_NAME:}"
+    USER_UID="${UID_GID%%:*}"
+    USER_GID="${UID_GID#$USER_UID:}"
+
+    useradd --home-dir "$BASE_DIR/$USER_NAME" --uid "$USER_UID" --gid "$USER_GID" "$USER_NAME"
+done
+
 exec /usr/sbin/sshd -D -e