From e649a976fa4d7bc3e70beda0576a8946ef38de4a Mon Sep 17 00:00:00 2001
From: alex <alex@pdp7.net>
Date: Sun, 25 Jan 2026 19:20:36 +0100
Subject: Add systemd-credential certificate loading and docs

---
 proxy.py | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

(limited to 'proxy.py')

diff --git a/proxy.py b/proxy.py
index 854446b..9bdb76f 100755
--- a/proxy.py
+++ b/proxy.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 import argparse
 import logging
+import os
 import pathlib
 import ssl
 import socketserver
@@ -8,7 +9,6 @@ import urllib.request
 
 
 context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
-domains_path = None
 
 class Handler(socketserver.BaseRequestHandler):
     def handle(self):
@@ -30,23 +30,32 @@ class Handler(socketserver.BaseRequestHandler):
             sock.sendall(response.encode("UTF8"))
 
 
-def sni_callback(socket: ssl.SSLSocket, server_name, _context):
-    context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
-    domain_path = domains_path / server_name
-    context.load_cert_chain(domain_path / "pubcert.pem", domain_path / "privkey.pem")
-    socket.context = context
-
-
 def main():
     logging.basicConfig(level=logging.DEBUG, format="%(asctime)s %(message)s")
     parser = argparse.ArgumentParser()
     parser.add_argument("--host", default="0.0.0.0")
     parser.add_argument("--port", type=int, default=1965)
-    parser.add_argument("domains_path", type=pathlib.Path)
+
+    group = parser.add_mutually_exclusive_group()
+    group.add_argument("--certificates-from-path", type=pathlib.Path)
+    group.add_argument("--certificates-from-credential")
     args = parser.parse_args()
 
-    global domains_path
-    domains_path = args.domains_path
+    if args.certificates_from_path:
+        def domain_to_path(server_name):
+            domain_path = args.certificates_from_path / server_name
+            return  (domain_path / "pubcert.pem" , domain_path / "privkey.pem")
+
+    if args.certificates_from_credential:
+        def domain_to_path(server_name):
+            credentials_directory = pathlib.Path(os.environ["CREDENTIALS_DIRECTORY"])
+            return (credentials_directory / f"{args.certificates_from_credential}_{server_name}_pubcert.pem", credentials_directory / f"{args.certificates_from_credential}_{server_name}_privkey.pem")
+
+    def sni_callback(socket: ssl.SSLSocket, server_name, _context):
+        context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
+        certfile, keyfile = domain_to_path(server_name)
+        context.load_cert_chain(certfile, keyfile)
+        socket.context = context
 
     context.sni_callback = sni_callback
 
-- 
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