1 files changed, 37 insertions, 0 deletions
diff --git a/rt-from-remote b/rt-from-remote
new file mode 100755
index 0000000..89d6623
--- /dev/null
+++ b/rt-from-remote
@@ -0,0 +1,37 @@
+#!/bin/bash
+
+# from-remote: this script is executed by the remote ssh client as
+#              instructed in .ssh/authorized_keys. 
+
+# /bin/bash: because of the usage of the non-posix 'exec -a'
+
+exec 2>>err
+
+log()
+{
+	echo `date` "$@" >> log
+}
+
+bad()
+{
+	mv $file bad/ra-$$.tar.gz
+	log "Bad connection attempt. SSH_CONNECTION='$SSH_CONNECTION', file=bad/ra-$$.tar.gz"
+	exit 1
+}
+
+mkdir -p ra ra/old bad
+file=ra/ra-$$.tar.gz
+dd of=$file bs=100k count=1 2>/dev/null
+tar tzf $file >/dev/null 2>&1 || bad
+pubkey=`tar xzf $file -O origkey | ssh-keygen -y -f /proc/self/fd/0 | awk '$1 == "ssh-rsa" {print $2}'`
+[ -z "$pubkey" ] && bad
+comment=`grep "$pubkey" .ssh/authorized_keys | awk '{print $NF}'`
+[ -z "$comment" ] && bad
+mv -f ra/$comment-* ra/old 2>/dev/null
+mv $file ra/$comment-$$.tar.gz
+file=ra/$comment-$$.tar.gz
+keyfile=ra/$comment-key
+tar xzf $file -O key > $keyfile || bad
+chmod 600 $keyfile
+log "Connection from $comment. SSH_CONNECTION='$SSH_CONNECTION', file=$file"
+exec -a sleep-$comment sleep 1d