9/2/2023 0 Comments Path of the splice 2Peeking at this step usually makes bumping at step 3 impossible.With the adjusted CONNECT request mentioned above. Adjust the CONNECT request from step1 to reflect SNI. Get TLS Client Hello info from the client, including SNI whereĪvailable.The same is true for some real CONNECT requests in The log entry will contain only the destination Note that for intercepted HTTPS traffic there is no “domain name”Īvailable at this point. The CONNECT request is logged in access.log. Step 1 is the only step that is always performed. With the CONNECT request mentioned above.Īnd perform the first matching action (splice, bump, peek, stare, or In interception environments, create a fake CONNECT request.In forward proxy environments, also parse the CONNECT request.Server _the flow is duplicated_ where the first flow is between clientĪnd proxy and the second flow between proxy and server. Note that with a bumping proxy between the client and the Shows a simplified data flow and related events between a TLS client andĪ TLS server. Often limit the actions that Squid may perform in the future. Peeking steps give Squid more information about the client or server but □ Processing stepsīumping Squid goes through several TCP and TLS “handshaking” steps. Two “looking at” actions (i.e., peek and stare) as well as various finalĪctions (e.g., “bump”, “splice”, “terminate”, etc.). Please see the actions table below for definitions of the Made at any of those steps (but what Squid does at step N affects its The final decision to splice, bump, or terminate the connection can be Possible) Client Hello message to the server, and then looks at the TLS SNI info (if any), sends an identical or similar (to the extent The Peek and Splice feature looks at the TLS Client Hello message and In most cases, this page uses TLS to mean TLS or SSL. Or when it becomes clear that we are not dealing with a TLS TLS handshake process, when client SNI and the server certificate areĪvailable. Peek and Splice gives admin a way to make bumping decisions later in the intercepted TCP connections reveal nothing but IP addresses and port.A typical HTTP CONNECT request does not contain many details, and.The new actions became available, the decision to bump was made based on Many SslBump deployments try to minimize potentialĭamage by not bumping sites unless the local policy demands it. Older Squids used server-first and client-first actions that did not “Peek and Splice” is a collection of new SslBumpĪctions and related features introduced in Squid-3.5. Known, especially when transparently intercepting TLS/SSL.
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