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Spoof origin to allow websocket creation

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This commit is contained in:
Midgard 2021-02-17 16:54:40 +01:00
parent de201dca56
commit 422b4a6312
Signed by: midgard
GPG key ID: 511C112F1331BBB4
1 changed files with 11 additions and 2 deletions
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13
etc/mitm_cors.py
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@ -1,6 +1,6 @@
# Script for mitmproxy, used in ../rundev.sh. Not meant to be run directly.
from mitmproxy import http
from mitmproxy import http, ctx
# More information about CORS: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
@ -8,6 +8,8 @@ ALLOWED_ORIGINS = ["http://localhost:8000"]
ALLOW_HEADERS = "Authorization, *" # Which headers the browser may send
EXPOSE_HEADERS = "Authorization, *" # Which headers the browser may expose to scripts
DEFAULT_PORTS = {"http": 80, "https": 443}
def allowed_origin(origin):
return origin if origin in ALLOWED_ORIGINS else ALLOWED_ORIGINS[0]
@ -17,10 +19,17 @@ def response(flow):
flow.response.headers["Access-Control-Expose-Headers"] = EXPOSE_HEADERS
def request(flow):
original_origin = flow.request.headers["Origin"]
# Spoof Origin, necessary for Mattermost to accept creating a websocket
if original_origin in ALLOWED_ORIGINS:
port_appendix = f":{flow.request.port}" if flow.request.port != DEFAULT_PORTS.get(flow.request.scheme) else ""
flow.request.headers["Origin"] = f"{flow.request.scheme}://{flow.request.host}{port_appendix}";
# Hijack CORS OPTIONS request
if flow.request.method == "OPTIONS":
flow.response = http.HTTPResponse.make(200, b"", {
"Access-Control-Allow-Origin": allowed_origin(flow.request.headers["Origin"]),
"Access-Control-Allow-Origin": allowed_origin(original_origin),
"Access-Control-Allow-Methods": "GET,POST",
"Access-Control-Allow-Headers": ALLOW_HEADERS,
"Access-Control-Max-Age": "10"