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Fediverse: Sign headers Date and Host to prevent replays.

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This commit is contained in:
Valentin Lorentz 2020-05-09 22:18:03 +02:00
parent 5c5cad5851
commit cf2142ddd2
1 changed files with 14 additions and 4 deletions
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18
plugins/Fediverse/activitypub.py
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@ -30,7 +30,9 @@
import os import os
import json import json
import email
import base64 import base64
import datetime
import functools import functools
import contextlib import contextlib
import urllib.parse import urllib.parse
@ -44,7 +46,7 @@ from cryptography.hazmat.primitives.asymmetric.rsa import generate_private_key
from supybot import commands, conf from supybot import commands, conf
from supybot.utils import web from supybot.utils import gen, web
XRD_URI = "{http://docs.oasis-open.org/ns/xri/xrd-1.0}" XRD_URI = "{http://docs.oasis-open.org/ns/xri/xrd-1.0}"
@ -189,14 +191,22 @@ def get_public_key_pem():
def signed_request(url, headers=None, data=None): def signed_request(url, headers=None, data=None):
method = "get" if data is None else "post" method = "get" if data is None else "post"
instance_actor_url = get_instance_actor_url() instance_actor_url = get_instance_actor_url()
headers = headers or {} headers = gen.InsensitivePreservingDict(headers or {})
if 'Date' not in headers:
headers['Date'] = email.utils.formatdate(usegmt=True)
if instance_actor_url: if instance_actor_url:
parsed_url = urllib.parse.urlparse(url)
signed_headers = [ signed_headers = [
( (
"(request-target)", "(request-target)",
method + " " + urllib.parse.urlparse(url).path, method + " " + parsed_url.path,
) ),
(
"host",
parsed_url.hostname,
),
] ]
for (header_name, header_value) in headers.items(): for (header_name, header_value) in headers.items():
signed_headers.append((header_name.lower(), header_value)) signed_headers.append((header_name.lower(), header_value))