Squid configuration directive ssl_bump
- Changes to ssl_bump in Squid-3.5:
Bumping 'modes' redesigned as 'actions' and ACLs evaluated repeatedly in a number of steps.
Renamed server-first as bump action.
Renamed none as splice action.
New actions peek and stare to receive client or server certificate while preserving the ability to later decide between bumping or splicing the connections later.
New action terminate to close the client and server connections.
- Changes to ssl_bump in Squid-3.3:
New action types none, client-first, server-first. The default is none.
Use of allow/deny is now deprecated and they should be removed as soon as possible. To retain the exact same behaviour between 3.3 and older releases replace deny with none, and allow with client-first. However an upgrade to server-first is the recommended.
NOTE: Mixing of allow/deny with the new action types is prohibited and will cause Squid to exit with a FATAL error.
For older versions than 3.3 see the linked pages above
|Default Value:||Become a TCP tunnel without decrypting proxied traffic.|
This option is consulted when a CONNECT request is received on an http_port (or a new connection is intercepted at an https_port), provided that port was configured with an ssl-bump flag. The subsequent data on the connection is either treated as HTTPS and decrypted OR tunneled at TCP level without decryption, depending on the first matching bumping "action". ssl_bump <action> [!]acl ... The following bumping actions are currently supported: splice Become a TCP tunnel without decrypting proxied traffic. This is the default action. bump Establish a secure connection with the server and, using a mimicked server certificate, with the client. peek Receive client (step SslBump1) or server (step SslBump2) certificate while preserving the possibility of splicing the connection. Peeking at the server certificate (during step 2) usually precludes bumping of the connection at step 3. stare Receive client (step SslBump1) or server (step SslBump2) certificate while preserving the possibility of bumping the connection. Staring at the server certificate (during step 2) usually precludes splicing of the connection at step 3. terminate Close client and server connections. Backward compatibility actions available at step SslBump1: client-first Bump the connection. Establish a secure connection with the client first, then connect to the server. This old mode does not allow Squid to mimic server SSL certificate and does not work with intercepted SSL connections. server-first Bump the connection. Establish a secure connection with the server first, then establish a secure connection with the client, using a mimicked server certificate. Works with both CONNECT requests and intercepted SSL connections, but does not allow to make decisions based on SSL handshake info. peek-and-splice Decide whether to bump or splice the connection based on client-to-squid and server-to-squid SSL hello messages. XXX: Remove. none Same as the "splice" action. All ssl_bump rules are evaluated at each of the supported bumping steps. Rules with actions that are impossible at the current step are ignored. The first matching ssl_bump action wins and is applied at the end of the current step. If no rules match, the splice action is used. See the at_step ACL for a list of the supported SslBump steps. This clause supports both fast and slow acl types. See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. See also: http_port ssl-bump, https_port ssl-bump, and acl at_step. # Example: Bump all TLS connections except those originating from # localhost or those going to example.com. acl broken_sites ssl::server_name .example.com ssl_bump splice localhost ssl_bump splice broken_sites ssl_bump bump all
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