We install ca-certificates-java, so that when we run update-ca-certificates, they are also installed into the JVM truststore. This PR contains a fer QoL improvements over the solution above. This has culminated in creating the PR #14207. This should now print the correct response, as well as show up on the proxy UI with full details for inspection. Let’s copy the root cert into the container, and install it by running the above commands inside the container: This is because Ubuntu’s update-ca-certificates command only picks files with a. How this is done, depends on the operating system, but in our case, since the container is Ubuntu, all we need to do is:Ĭopy the certificate file to /usr/local/share/ca-certificates. Instead, we want to install the root certificate of mitmproxy to the truststore, so that it’s available to all processes in the container for validating SSL certificates. We can provide the root cert of mitmproxy using the -cacert argument, but we want it to apply to all requests in the container, without such explicit configuration, so we won’t do that. This, as we can expect, fails due to a cert validation error, since it’s using the proxy, but the proxy’s certificate can’t be verified. To illustrate this, first, let’s run the same request from inside a container, and we should see the error right away: Docker containers are isolated systems in this context, and maintain their own list of trusted root certificates. Optionally, for curl, instead of installing the cert, we can use the -cacert flag to point to the root certificate.Īnother point to note here, is that installing this root certificate on your system, doesn’t mean it’ll be trusted in any Docker containers run on your system. The mitmproxy docs talk about how to install this cert. We can install this root certificate on our system, and then curl, or any other client, will trust it. The first time mitmproxy is started, it creates a new root certificate, in the ~/.mitmproxy folder. Everything sent by the client is encrypted using the certificate of mitmproxy, and everything by and to the server is encrypted with the server’s certificate. The way an SSL proxy works is by establishing two SSL connections, one with the client (a browser, or curl), initiated by the client, and another with the server (the server in this case). This will fail with a verification error, that the SSL certificate couldn’t be verified.
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