Mitmproxy: Unable to get mitmproxy working on Sierra

[prastut]

Problem:

I have been trying to get mitmproxy to work on my macOS sierra and unable to do so.

What have you tried so far?

• Installed using Hombrew: brew install mitmproxy.
• By running mitmproxy on the terminal it starts the application.
• As the docs suggest, I now have to install certificates:
  
  
  
  • Went to mitm.it. It shows: If you can see this, traffic is not passing through mitmproxy.
  
  
  • Googled if somebody else has this issue and followed the manual setup.
  
  
• Removed ~./mitmproxy folder for a clean run. Restarted mitmproxy. The new cert's are created.
• Copied the entire folder ~./mitmproxy to the Keychain Access. For files with password entered nothing and continued. In the end Keychain Access gives me the results:
  An error has occurred. Unable to import an item. The contents of this item cannot be retrieved.

• Still I see an entry for mitmproxy certs in Keychain access with the following error with it:

  This root certificate is not trusted
  

• Double clicking on the certificate -> Trust -> When using the certificate. Changed from Use System defaults to Always trust. The above error of not getting trusted get's removed.
• Restarted mitmproxy. No logs if I go to some website. mitm.it shows the same error.
• Restarted Mac for reloading certs, that also didn't solve the problem.

System information

Mitmproxy version: 2.0.2 (release version)
Python version: 3.6.1
Platform: Darwin-16.5.0-x86_64-i386-64bit
SSL version: OpenSSL 1.1.0e 16 Feb 2017
Mac version: 10.12.4 ('', '', '') x86_64

Thoughts

Read the documentation again more closely in case that I might have missed something. In the Quick Setup it's mentioned

```
start mitmproxy and configure your target device with the correct proxy settings.
````

How does one configure my device with correct proxy settings?

[prastut]

Followup:

I found this article:
https://medium.com/@maxgreenwald/mitmproxy-your-d-i-y-private-eye-864c08f84736

And according to the article's suggestions configured Chrome's proxy to port 8080. Now I am able to see the traffic in mitmproxy logs. Though if I still go to mitm.it I get the same error of traffic not passing through mitmproxy.

[Kriechi]

You have to change you browser's proxy settings.
Enable the HTTP proxy, and set it to localhost with port 8080.

Also, I think you have to make sure that there is no "Bypass proxy for these hosts" setting for localhost or 127.0.0.1.

[mhils]

Thanks for the detailed report. While it's easy to classify this as a layer 8 error, I think we should ultimately have better docs for this. Or - as Charles and Fiddler do it (I think) - capture the local machine by default.

refs https://github.com/mitmproxy/mitmproxy.org/issues/20

[mhils]

I'm closing this anyway, as there's nothing immediately actionable for us in here. We'll handle this in the issue linked above though, thanks again for the report!

[Graystripe17]

Another answer: I forgot to turn off my adblock VPN :/