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|
#!/usr/bin/env bash
# Mininet ssh authentication script for cluster edition
# This script will create a single key pair, which is then
# propagated throughout the entire cluster.
# There are two options for setup; temporary setup
# persistent setup. If no options are specified, and the script
# is only given ip addresses or host names, it will default to
# the temporary setup. An ssh directory is then created in
# /tmp/mn/ssh on each node, and mounted with the keys over the
# user's ssh directory. This setup can easily be torn down by running
# clustersetup with the -c option.
# If the -p option is used, the setup will be persistent. In this
# case, the key pair will be be distributed directly to each node's
# ssh directory, but will be called cluster_key. An option to
# specify this key for use will be added to the config file in each
# user's ssh directory.
set -e
num_options=0
persistent=false
showHelp=false
clean=false
declare -a hosts=()
user=$(whoami)
SSHDIR=/tmp/mn/ssh
USERDIR=$HOME/.ssh
usage="./clustersetup.sh [ -p|h|c ] [ host1 ] [ host2 ] ...\n
Authenticate yourself and other cluster nodes to each other
via ssh for mininet cluster edition. By default, we use a
temporary ssh setup. An ssh directory is mounted over
$USERDIR on each machine in the cluster.
-h: display this help
-p: create a persistent ssh setup. This will add
new ssh keys and known_hosts to each nodes
$USERDIR directory
-c: method to clean up a temporary ssh setup.
Any hosts taken as arguments will be cleaned
"
persistentSetup() {
echo "***creating key pair"
ssh-keygen -t rsa -C "Cluster_Edition_Key" -f $USERDIR/cluster_key -N '' &> /dev/null
cat $USERDIR/cluster_key.pub >> $USERDIR/authorized_keys
echo "***configuring ssh"
echo "IdentityFile $USERDIR/cluster_key" >> $USERDIR/config
echo "IdentityFile $USERDIR/id_rsa" >> $USERDIR/config
for host in $hosts; do
echo "***copying public key to $host"
ssh-copy-id -i $USERDIR/cluster_key.pub $user@$host &> /dev/null
echo "***copying key pair to remote host"
scp $USERDIR/cluster_key $user@$host:$USERDIR
scp $USERDIR/cluster_key.pub $user@$host:$USERDIR
echo "***configuring remote host"
ssh -o ForwardAgent=yes $user@$host "
echo 'IdentityFile $USERDIR/cluster_key' >> $USERDIR/config
echo 'IdentityFile $USERDIR/id_rsa' >> $USERDIR/config"
done
for host in $hosts; do
echo "***copying known_hosts to $host"
scp $USERDIR/known_hosts $user@$host:$USERDIR/cluster_known_hosts
ssh $user@$host "
cat $USERDIR/cluster_known_hosts >> $USERDIR/known_hosts
rm $USERDIR/cluster_known_hosts"
done
}
tempSetup() {
echo "***creating temporary ssh directory"
mkdir -p $SSHDIR
echo "***creating key pair"
ssh-keygen -t rsa -C "Cluster_Edition_Key" -f $SSHDIR/id_rsa -N '' &> /dev/null
echo "***mounting temporary ssh directory"
sudo mount --bind $SSHDIR $USERDIR
cp $SSHDIR/id_rsa.pub $SSHDIR/authorized_keys
for host in $hosts; do
echo "***copying public key to $host"
ssh-copy-id $user@$host &> /dev/null
echo "***mounting remote temporary ssh directory for $host"
ssh -o ForwardAgent=yes $user@$host "
mkdir -p $SSHDIR
cp $USERDIR/authorized_keys $SSHDIR/authorized_keys
sudo mount --bind $SSHDIR $USERDIR"
echo "***copying key pair to $host"
scp $SSHDIR/{id_rsa,id_rsa.pub} $user@$host:$SSHDIR
done
for host in $hosts; do
echo "***copying known_hosts to $host"
scp $SSHDIR/known_hosts $user@$host:$SSHDIR
done
}
cleanup() {
for host in $hosts; do
echo "***cleaning up $host"
ssh $user@$host "sudo umount $USERDIR
sudo rm -rf $SSHDIR"
done
echo "**unmounting local directories"
sudo umount $USERDIR
echo "***removing temporary ssh directory"
sudo rm -rf $SSHDIR
echo "done!"
}
if [ $# -eq 0 ]; then
echo "ERROR: No Arguments"
echo "$usage"
exit
else
while getopts 'hpc' OPTION
do
((num_options+=1))
case $OPTION in
h) showHelp=true;;
p) persistent=true;;
c) clean=true;;
?) showHelp=true;;
esac
done
shift $(($OPTIND - 1))
fi
if [ "$num_options" -gt 1 ]; then
echo "ERROR: Too Many Options"
echo "$usage"
exit
fi
if $showHelp; then
echo "$usage"
exit
fi
for i in "$@"; do
output=$(getent ahostsv4 "$i")
if [ -z "$output" ]; then
echo '***WARNING: could not find hostname "$i"'
echo ""
else
hosts+="$i "
fi
done
if $clean; then
cleanup
exit
fi
echo "***authenticating to:"
for host in $hosts; do
echo "$host"
done
echo
if $persistent; then
echo '***Setting up persistent SSH configuration between all nodes'
persistentSetup
echo $'\n*** Sucessfully set up ssh throughout the cluster!'
else
echo '*** Setting up temporary SSH configuration between all nodes'
tempSetup
echo $'\n***Finished temporary setup. When you are done with your cluster'
echo $' session, tear down the SSH connections with'
echo $' ./clustersetup.sh -c '$hosts''
fi
echo
|
