Trusting mitm

When mitm runs it generates a certificate authority (CA) that is used to generate dummy certificates for each website visited. To trust this certificate you must install it on your system. By default, the certificate is generated in the mitm.__data__ directory. To discover what this directory is do the following:

$ python
Python 3.9.6 (default, Aug 31 2021, 00:19:31)
[Clang 12.0.5 (clang-1205.0.22.11)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import mitm
>>> mitm.__data__
PosixPath('/Users/felipe/Library/Application Support/mitm') # You should see a different path.
>>> exit()

$ ls /Users/felipe/Library/Application\ Support/mitm
mitm.key mitm.pem

Customizing Path

To customize the path where the certificate is generated, you can use the following snippet:

from mitm import MITM, CertificateAuthority, middleware, protocol
from pathlib import Path

# Loads the CA certificate.
path = Path("/Users/felipe/Desktop")
certificate_authority = CertificateAuthority.init(path=path)

# Starts the MITM server.
mitm = MITM(
    host="127.0.0.1",
    port=8888,
    protocols=[protocol.HTTP],
    middlewares=[middleware.Log],
    certificate_authority=certificate_authority,
)
mitm.run()

Installing CA

Different systems have different ways to install the certificate. Its recommended you look up “how to install a certificate” on your system.