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--- vpn-ssh-tap [2020/07/25 01:59]
robm
+++ vpn-ssh-tap [2020/08/06 11:48] (current)
robm [VPN via SSH TAP interfaces]
@@ Line 10: / Line 10: @@
 VM, where eth1 is connected to the network I want to make my RPi appear in:
+Vagrantfile (based on using [[https://www.parallels.com/|Parallels]], rather than VirtualBox):
 <code>
-ip link add br0 up type bridge             # Create a bridge
+# -*- mode: ruby -*-
-ip address add 192.168.167.134/24 dev br0  # Copy the address and netmask of eth1
+# vi: set ft=ruby :
-ip address flush dev eth1                  # Remove eth1's addresses completely
-ip link set eth1 master br0                # Attach eth1 to the bridge
-</code>
-Raspberry Pi:
+BRIDGE_ADAPTORS=[
+  "en0: Wi-Fi (AirPort)", # MacBook Pro (MacOS v10.15, Catalina), VirtualBox
+  "en0",                  # MacBook Pro (MacOS v10.15, Catalina), Parallels
+  "eno1",                 # Ubuntu 16.04 LTS
+  # Add your OS's default here
+  ]
-<code>
+Vagrant.configure("2") do |config|
-sudo ip link add br0 up type bridge
+  config.vm.box = "bento/ubuntu-20.04"
-sudo ssh \
+  config.vm.network "public_network", bridge: BRIDGE_ADAPTORS
-  -o PermitLocalCommand=yes \
-  -o "LocalCommand=ip link set tap5 up master br0" \
-  -o Tunnel=ethernet \
-  -w 5:5 \
-  -t \
-  root@192.168.167.237 \
-  "ip link set tap5 up master br0"
-</code>
+  config.vm.provider "parallels" do |prl|
+    # Cf. http://download.parallels.com/doc/pcs/html/Parallels_Cloud_Server_Command_Line_Reference_Guide/32912.htm
+    prl.customize ["set", :id,
+                   "--device-set", "net0",
+                   "--ipfilter", "no",
+                   "--macfilter", "no",
+                   "--preventpromisc", "no"]
+    prl.customize ["set", :id,
+                   "--device-set", "net1",
+                   "--ipfilter", "no",
+                   "--macfilter", "no",
+                   "--preventpromisc", "no"]
+  end
+  config.vm.provision "shell",
+    privileged: true,
+    inline: <<-SHELL
+      # Secure Shell daemon configuration changes
+      echo "PermitTunnel yes" >> /etc/ssh/sshd_config
+      echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
+      systemctl reload sshd
+      # Root account is disabled by default (password begins with literal '!'),
+      # so we'll change the password to re-enable the account
+      usermod -p '*' root
+      # Install GadgetPi's ~/.ssh/id_rsa.pub, so it can login as root without
+      # requiring an operator
+      umask 0077
+      mkdir /root/.ssh
+      echo "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCx963D3ErL6s9uWmSye1ZU+TCS4aDAJBbQI/NZLqg05EXnYVfXEPm2ZuStij4JjsIgdFbL+E73vd/alNgUBpe1YD73+oP9ndSdsAU/kXrx/zy0qCRWsi4fma6MmGIU0sYFuNvnwKsyjoFu0g5Y4SKQeD/0J7f+AmP4XOSnR2mhcFFE96wFYdq1UJanky0YI/oJcz2CRny5tO+iCjqm98BcvnEI/3vQOH4fOtffzW1SvqDobiQtP58POHd2NfRJo9ygVemCFqdvV9v17tvuhW0AxBZcBm1TZ9wb/oQnWvR8OvqO0XSYGZYuC+DERCSC+3dLSNL/LmoDDDdIjgHXTUNv root@raspberrypi
+" >> /root/.ssh/authorized_keys
+      # Enable acting as a router (forwarding packets)
+      echo "" >> /etc/sysctl.conf  # In case the file does not end with a newline
+      echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
+      sysctl --load /etc/sysctl.conf
+    SHELL
+    config.vm.post_up_message = <<-EOF
+      Run the following on this VM:
+        ETH1_IP=192.168.167.100/24
+        sudo ip link add br0 up type bridge     # Create a bridge
+        sudo ip address add ${ETH1_IP} dev br0  # Copy the address and netmask of eth1
+        sudo ip address flush dev eth1          # Remove eth1's addresses completely
+        sudo ip link set eth1 master br0        # Attach eth1 to the bridge
+      Run the following on the GadgetPi:
+        REMOTE_HOST=192.168.167.237
+        sudo ip link add br0 up type bridge
+        sudo ip link set eth0 up master br0
+        sudo ssh \\
+            -o PermitLocalCommand=yes \\
+            -o "LocalCommand=ip link set tap5 up master br0" \\
+            -o Tunnel=ethernet \\
+            -w 5:5 \\
+            -t \\
+            root@${REMOTE_HOST} \\
+            "ip link set tap5 up master br0"
+    EOF
+end
+</code>
 ===== Debugging =====
 I found [[https://www.wireshark.org/docs/man-pages/tshark.html| tshark - Dump and analyze network traffic]] useful, as it can capture ethernet frames to a file (such as ''/vagrant/tshark'') which you can then load into the Wireshark GUI after the fact.

RobMeerman.co.uk

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