Update examples and start to manage server keys

.gitignore

@@ -1,2 +1,4 @@
 id_rsa_proxy
 id_rsa_proxy.pub
+keys/
+authorized_keys

Makefile

@@ -1,38 +1,49 @@
 .PHONY: default
-default: remote client
+default: server client
 
 .PHONY: all
-all: remote client
+all: server client
 
 .PHONY: stop
 stop:
-	docker-compose -f ./docker-compose-remote.yml stop
+	docker-compose -f ./docker-compose-server.yml stop
 	docker-compose -f ./docker-compose-client.yml stop
 
 .PHONY: restart
 restart:
-	docker-compose -f ./docker-compose-remote.yml restart
+	docker-compose -f ./docker-compose-server.yml restart
 	docker-compose -f ./docker-compose-client.yml restart
 
 .PHONY: down
 down:
-	docker-compose -f ./docker-compose-remote.yml down
 	docker-compose -f ./docker-compose-client.yml down
+	docker-compose -f ./docker-compose-server.yml down
 
-.PHONY: remote
+.PHONY: server
-remote:
+server: keys
-	docker-compose -f ./docker-compose-remote.yml build
+	docker-compose -f ./docker-compose-server.yml build
-	docker-compose -f ./docker-compose-remote.yml up -d
+	docker-compose -f ./docker-compose-server.yml up -d
 
 .PHONY: client
 client:
 	docker-compose -f ./docker-compose-client.yml build
 	docker-compose -f ./docker-compose-client.yml up -d
 
-.PHONY: remote-logs
+.PHONY: server-logs
-remote-logs:
+server-logs:
-	docker-compose -f ./docker-compose-remote.yml logs -f
+	docker-compose -f ./docker-compose-server.yml logs -f
 
 .PHONY: client-logs
 client-logs:
 	docker-compose -f ./docker-compose-client.yml logs -f
+
+keys:
+	mkdir -p keys/etc/ssh
+	ssh-keygen -A -f keys/
+
+keys/etc/ssh/ssh_host_dsa_key: keys
+keys/etc/ssh/ssh_host_ecdsa_key: keys
+keys/etc/ssh/ssh_host_ed25519_key: keys
+keys/etc/ssh/ssh_host_rsa_key: keys
+
+keys/known_hosts: keys

Readme.md

@@ -49,6 +49,7 @@ Dockamole is configured using environment variables:
     # Optional
     MAX_TUNNELS         number of tunnels allowed (default 10)
     SSH_KEY             path to ssh private key that should be used (default ~/.ssh/id_rsa)
+    GEN_KNOWN_HOSTS     determines if known hosts should be generated on first start (default 1)
 
 ## Use in production
 

docker-compose-server.yml

@@ -9,6 +9,11 @@ services:
       # This key must be provided
       # - ./id_rsa_proxy.pub:/etc/authorized_keys/mole
       - ./authorized_keys:/etc/authorized_keys/mole
+      # Mount host keys
+      - ./keys/etc/ssh/ssh_host_dsa_key:/etc/ssh/ssh_host_dsa_key
+      - ./keys/etc/ssh/ssh_host_ecdsa_key:/etc/ssh/ssh_host_ecdsa_key
+      - ./keys/etc/ssh/ssh_host_ed25519_key:/etc/ssh/ssh_host_ed25519_key
+      - ./keys/etc/ssh/ssh_host_rsa_key:/etc/ssh/ssh_host_rsa_key
     environment:
       - SSH_USERS=mole:101:101
 

mole/Dockerfile

@@ -1,7 +1,9 @@
 FROM alpine
 
-RUN apk add bash curl tar
+# Install latest mole
-RUN bash -c "bash <(curl -fsSL https://raw.githubusercontent.com/davrodpin/mole/master/tools/install.sh | sed 's/\bsudo\b//g')"
+RUN apk --no-cache add bash curl tar openssh-client && \
+        bash -c "bash <(curl -fsSL https://raw.githubusercontent.com/davrodpin/mole/master/tools/install.sh | sed 's/\bsudo\b//g')" && \
+        apk del curl tar
 
 RUN mkdir /mole
 RUN adduser -S -h /mole mole
@@ -10,6 +12,10 @@ USER mole
 
 RUN mkdir -p /mole/.ssh
 RUN touch /mole/.ssh/config
+# Make a volume to persist keys
+VOLUME /mole/.ssh
+
+ENV GEN_KNOWN_HOSTS=1
 
 COPY ./start.sh ./
 

mole/start.sh

@@ -1,23 +1,67 @@
 #! /bin/bash
+set -e
+
+# Tests if the command being passed in is for a shell
+function is_shell() {
+    case "$1" in
+        bash|sh)
+        return 0
+        ;;
+    esac
+    return 1
+}
+
+# Determines if we should append to known_hosts
+function should_append_hosts() {
+    [ "${GEN_KNOWN_HOSTS:=1}" -eq 1 ]
+}
+
+# Appends server key to known_hosts if it's not already there
+function maybe_append_host() {
+    local host=$(echo $1 | sed -e 's/.*@//' -e 's/:.*//')
+    local port=$(echo $1 | sed -n 's/.*:\([0-9]*\)/\1/p')
+    local known_hosts=$HOME/.ssh/known_hosts
+    touch $known_hosts
+    echo "Ensuring $host is in $known_hosts..."
+    echo "grep -q $1 $known_hosts || ssh-keyscan -p ${port:-22} $host >> $known_hosts"
+    grep -q $host $known_hosts || ssh-keyscan -p ${port:-22} $host >> $known_hosts
+}
 
 # Executes mole using local and remotes from env variables
-
+function get_local_remote_mapping() {
-local_remote=""
+    local local_remote=""
-for i in `seq ${MAX_TUNNELS:-10}`; do
+    for i in `seq ${MAX_TUNNELS:-10}`; do
         local_name=MOLE_LOCAL_$i
         remote_name=MOLE_REMOTE_$i
         if [ ! -z "${!local_name}" ] && [ ! -z "${!remote_name}" ]; then
             local_remote="$local_remote -local ${!local_name} -remote ${!remote_name}"
         fi
-done
+    done
+    echo $local_remote
+}
 
-if [ -z "$local_remote" ]; then
+function main() {
+    if should_append_hosts ;then
+        maybe_append_host $MOLE_SERVER
+    fi
+    local local_remote=$(get_local_remote_mapping)
+    if [ -z "$local_remote" ]; then
         echo "Must provide at least one local and remote via MOLE_LOCAL_1 and MOLE_REMOTE_1"
         exit 1
+    fi
+
+    mole -v \
+        $local_remote \
+        $@ \
+        -server ${MOLE_SERVER} \
+        -key ${SSH_KEY:-~/.ssh/id_rsa}
+}
+
+# If first arg is bash or sh, we'll just execute directly
+if is_shell $1 ; then
+    echo "We think you're trying to just drop into a shell"
+    exec "$@"
+    exit 0
 fi
 
-mole -v \
+main $@
-    $local_remote \
-    -server ${MOLE_SERVER} \
-    -key ${SSH_KEY:-~/.ssh/id_rsa} \
-    -insecure