In order to be able to sniff into the connection, mitmproxy acts as a certificate authority, however, not a very trustworthy one: Instead of issuing certificates to actual persons or organizations, mitmproxy dynamically generates certificates to whatever hostname is needed for a connection. If both conditions are true, the client assumes the connection is secure. And second, it makes sure that the common name (CN, also: host name) of the server matches the one it connects to. When the client opens an SSL/TLS connection to the secure web server, it verifies the server’s identity by checking two conditions: First, it checks whether its certificate was signed by a CA known to the client. And because the transferred data is encrypted with a shared secret, a middle man (or a proxy) cannot decipher the exchanged data packets. While attacking unencrypted HTTP traffic can be done without having to deal with X.509 certificates and certificate authorities (CA), SSL-encrypted HTTPS connections encrypt every request and response between client and server end-to-end. And to the server, it looks like the mitmproxy server is the client. mitmproxy simply acts as a middle man: To the client, it looks like as if the mitmproxy server was simply relaying its connection (like your router or your ISP’s servers do). Attacking HTTP connectionsįor unencrypted HTTP connections, this is quite simple: mitmproxy accepts a connection from the HTTP client, say a mobile browser, displays the request (and its request parameters) to the attacker on the screen, and forwards the request to the destination web server as soon as the attacker confirms - maybe after adjusting the request payload a bit. However, while other proxies typically focus on content filtering or speed optimization through caching, the goal of mitmproxy is to let an attacker monitor, capture and alter these connections in realtime. Similar to other proxies (such as Squid), it accepts connections from clients and forwards them to the destination server. Mitmproxy is an open source proxy application that allows intercepting HTTP and HTTPS connections between any HTTP(S) client (such as a mobile or desktop browser) and a web server using a typical man-in-the-middle attack(MITM). Using DNS instead of the standard gateway Capture and alter HTTP/HTTPS requests and responses Enable IP forwarding and port redirection Install mitmproxy CA certificate in the phone
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