HTTPS Decryption (Man-in-the-Middle Attack, MitM)

Surge may decrypt HTTPS traffic by MitM. Please see Wikipedia article for more information.

Certificate generator will help you generate a new CA certificate for debugging and make the certificate trusted by system. It's available in Surge Dashboard (Mac version) and Surge iOS Config Editor. This certificate is generated locally and will only be saved in your config file and system Keychain. The key of certificate is generated randomly using OpenSSL.

You can also use an existed CA certificate. Export the certificate to PKCS#12 format (.p12) with passphrase. Please note that the passphrase cannot be empty due to system limitation. Use "base64" command to encode in base64 string and append these settings below to your config file.

[MITM]
enable = true
ca-p12 = MIIJtQ.........
ca-passphrase = password
hostname = *google.com

Surge will only decrypt traffic to hosts declared here.

  • Wildcard characters * and ? are supported.
  • Use prefix - to exclude a hostname.
  • By deafult only the requests to port 443 will be decrypted.
    • Use suffix :port to allow other ports.
    • Use suffix :0 to allow all ports.

Example:

  • -*.apple.com: Excludes all requests sent to *.apple.com on port 443.
  • www.google.com: Allows MitM for www.google.com on port 443.
  • www.google.com:8080: Allows MitM for www.google.com on port 8080.
  • www.google.com:0: Allows MitM for www.google.com on all ports.
  • *:0: Allows MitM for all hostnames on all ports.

A general configuration may be like:

hostname = -*.apple.com, -*.icloud.com, *

Some applications has strict security policy to use pinned certificates or CA. Enabling decryption to these hosts may casue problems.

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