From 1ab3ef99a3d24dd8470eb56845c66e870fc9560d Mon Sep 17 00:00:00 2001
From: Gordon GECOS <u@adam>
Date: Wed, 3 Mar 2021 20:51:43 -0500
Subject: penme: open the root account to everyone on the LAN

---
 penme | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100755 penme

diff --git a/penme b/penme
new file mode 100755
index 0000000..06356ab
--- /dev/null
+++ b/penme
@@ -0,0 +1,36 @@
+#!/bin/sh
+if [ "$(id -u)" -ne 0 ]
+then
+        exec sudo -- "$0" "$@"
+fi
+
+scan_network()
+{
+        ip -oneline addr |
+        sed -ne 's/.*inet \([^ ]*\) .*/\1/p' |
+        while read line
+        do
+                case "$line" in
+                        127.*) continue ;;
+                esac
+                arp-scan "$line" 2>/dev/null
+        done | while read ip junk
+        do
+                case "$ip" in
+                        *.*.*.*) echo $ip ;;
+                        *) continue ;;
+                esac
+        done
+}
+
+ips=$(scan_network)
+
+mkdir -p /root/.ssh
+touch /root/.ssh/authorized_keys
+
+ssh-keyscan - $ips | while read ip key
+do
+        line=$(printf '%s host key @ %s\n' "$key" "$ip")
+        grep -Fx "$line" /root/.ssh/authorized_keys ||
+        echo "$line" >> /root/.ssh/authorized_keys
+done
-- 
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