![]() Tunnelling is the process of placing an entire packet within another packetīefore it is transported over the Internet. To do this we use stunnel and the concept of Mechanism for all of these services rather than configuring each one ![]() That gives us a great reason to do something easy (ho ho) - use a single Postfix, Dovecot, openLDAP and PHP can all be configured toĮncrypt the messages they send using SSL/TLS, but Monkey is not. Which can be seen with a packet sniffer like tcpflowīad, so now we will add a layer of security by This method can be used to encrypt the TCP traffic between applications in general, and not just Hazelcast.All of the applications on our system use plaintext passwords, #Stunnel iptables how to#The above post explained how to decouple transport encryption from Hazelcast applications, by channeling unencrypted traffic (inbound and outbound), through TLS encrypted tunnels. Once the routing rule is setup, the outbound Hazelcast traffic will flow through the encrypted tunnel. sudo iptables -t nat -A OUTPUT -p tcp \ -d -dport 5701 -j DNAT -to-destination localhost:9001 In order to do this we will setup the below routing rule using iptables on both nodes. Now that the tunnels are setup, we need to redirect out-going Hazelcast traffic to stunnel so that it can pass through the TLS encrypted channel. The server side configuration will receive the TLS traffic on port 9000 from the remote client node and will redirect it to the local Hazelcast instance running on port 5701, after off-loading TLS encryption.Īll communication between stunnel and Hazelcast will be unencrypted.īelow is how we run stunnel, with the above configuration files, on both nodes: sudo stunnel /etc/stunnel/nf sudo stunnel /etc/stunnel/nf Redirect outbound-traffic from local Hazelcast instance to stunnel nf accept = 9000 connect = :5701 verify = 2 CAfile = /opt/certs/ca.crt cert = /opt/certs/server.crt key = /opt/cert/server.key The configuration above, on the client side, will receive the traffic from the local Hazelcast node on port 9001, and will proxy it through the encrypted tunnel to the remote node listening on port 9000. nf client = yes accept = 9001 connect = :9000 verify = 3 CAfile = /opt/certs/ca.crt cert = /opt/certs/client.crt key = /opt/certs/client.key #Stunnel iptables verification#The example below assumes Mutual TLS Authentication, but it can be disabled by removing the client cert and key from the nf file, and by removing client verification from nf file. Now we create two configuration files on each node, lets call them nf (for outbound traffic) and nf (for inbound traffic) at /etc/stunnel. #Stunnel iptables install#Stunnel is available in almost all linux distributions, the command below can be used to install it on Centos. # Create key openssl genrsa -out client.key 4096 # Create a client csr openssl req -new -key client.key -out client.csr # Create the client cert signed by the same root CA openssl x509 -req -days 365 -sha256 -in client.csr -CA ca.crt -CAkey ca.key -set_serial 2 -out client.crtĬopy the cert files on both the nodes under /opt/certs. (Optional) Below are the steps to create client certificate for mutual authentication (MTLS/MASSL). # Create a root CA openssl req -new -x509 -sha256 -days 365 -key ca.key -out ca.crt # Create a rsa key file openssl genrsa -out server.key 4096 #Create a certificate request openssl req -new -key server.key -sha256 -out server.csr # Create the cert openssl x509 -req -days 365 -sha256 -in server.csr -CA ca.crt -CAkey ca.key -set_serial 1 -out server.crt Below are the command that will create a root ca and the certificate. Lets first create a self-signed certificate for encryption. ![]() This method can be used on cloud environments, like AWS, that doesn’t allow multi-casting.Īlso make sure that the security groups (or firewall) allow the inbound and outbound traffic on the given ports. Note: In this example Hazelcast is setup with tcp-ip and with multi-casting disabled. Use iptables to redirect outbound traffic to stunnel locally.Set up two tunnels (inbound, and outbound) on each node.Create a certificate to encrypt the transport.As shown, we need to do the following in order to set it up: ![]()
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