Create login-alerts.sh

setup/login-alerts.sh

@@ -0,0 +1,29 @@
+function get_default_hostname {
+	# Guess the machine's hostname. It should be a fully qualified
+	# domain name suitable for DNS. None of these calls may provide
+	# the right value, but it's the best guess we can make.
+	set -- $(hostname --fqdn      2>/dev/null ||
+                 hostname --all-fqdns 2>/dev/null ||
+                 hostname             2>/dev/null)
+	printf '%s\n' "$1" # return this value
+}
+
+echo '
+#!/bin/sh
+# Change these two lines:
+sender="bot@"
+sender+=get_default_hostname
+recepient="admin@"
+recepient+=get_default_hostname
+
+if [ "$PAM_TYPE" != "close_session" ]; then
+    host="`hostname`"
+    subject="SSH Login: $PAM_USER from $PAM_RHOST on $host"
+    # Message to send, e.g. the current environment variables.
+    message="If you don't recognize this login, your key or password may be compromised."
+    echo "$message" | mailx -r "$sender" -s "$subject" "$recepient"
+fi' > /etc/ssh/login-alert.sh
+
+chmod +x /etc/ssh/login-alert.sh
+
+echo 'session optional pam_exec.so seteuid /etc/ssh/login-alert.sh' >> /etc/pam.d/sshd