jacquarg · December 26, 2013 21:28 · Dec 26, 2013
diff --git a/addkey b/addkey
@@ -0,0 +1,35 @@
+#!/bin/sh
+
+
+# Read in the SSH key
+echo "Input the key to be added:"
+read key
+
+# Place the key in a temporary file (it's hard to get ssh-keygen
+# to read from stdin; <<< works for bash, but is non-posix)
+keyfile=$(tempfile) &&\
+echo "$key" > $keyfile
+
+# Generate a fingerprint
+fingerprint=$(ssh-keygen -lf $keyfile)
+
+# Check for errors
+if [ $(echo "$fingerprint" | egrep -c '(R|D)SA') -eq 0 ]
+then
+
+	# Display the fingerprint error and clean up
+	echo "Error: $fingerprint"
+	rm $keyfile
+	exit 1
+
+fi
+
+# Add the key to the authorised keys file and clean up
+mkdir -p .ssh &&\
+echo -n "no-agent-forwarding,no-port-forwarding,no-X11-forwarding " >> .ssh/authorized_keys &&\
+cat $keyfile >> .ssh/authorized_keys
+rm $keyfile
+
+# Display the fingerprint for reference
+echo "Success! Added a key with the following fingerprint:"
+echo $fingerprint