If you want to be able to quickly change decodings, I recommend you use different profiles: the default profile, and a second profile where you configure your custom ports.ī DidierStevensLabs. For example, for SSL/TLS you go to the configuration of the HTTP dissector: Edit / Preferences / Protocols / HTTP which ensures that only two communication parties can decrypt the traffic. If you want to make this permanent, you will have to go into the configuration of the dissectors. While in TLS v 1.2, it gets two round trips time to establish a connection. is not a permanent change: this setting is discarded when Wireshark is closed. These values represent the SSL/TLS version: SSL 3.0, TLS 1.0, TLS 1.1, TLS 1.2. If these bytes are all 03 00, or 03 01, or 03 02, or 03 03, then you are most likely dealing with SSL/TLS traffic. There are a couple of tricks to recognize SSL/TLS traffic: you might see a domain name or strings from the certificate in the first packets, or if you are "brave" enough to look at raw bytes, take a look at the second and third byte of data payload of each TCP packet. To get Wireshark to decode this traffic as SSL/TLS, you right-click a packet and select "Decode As.".Īnd then you configure Wireshark to decode traffic with port 22 as SSL:Īnd now, you get traffic that is properly dissected:Īs SSL/TLS becomes ubiquitous, you can expect to find SSL/TLS traffic on non-standard ports. You can identify suspect traffic with Wireshark or other packet-capture tools, but to inspect the actual traffic you’ll need to be able to decrypt the payload to examine it. Encrypted traffic can create a security blind spot, making it possible for threat actors to hide. The traffic in the first capture is actually TLS. How A10 Networks Supports TLS Encryption and SSL Decryption. If the port is 22, Wireshark will try to decode the traffic as SSH, even it it is not SSH. Wireshark will try to decode protocols based on several criteria, one of them is the port number. So that first capture, is probably not SSH. Using ssldump to Decode/Decrypt SSL/TLS Packets This is the simple bit really, assuming ssldump is already installed on your Linux host. You may need modify cipher strings on relevant hosts to ensure this is the case. Here, you get more details for the individual SSH packets. There is no way to decrypt data where ephemeral ciphers are used. Wireshark dissects this as SSH traffic, but is it really?
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