1 files changed, 46 insertions, 0 deletions
diff --git a/branding/check-ca-crt.py b/branding/check-ca-crt.py
new file mode 100755
index 0000000..6462467
--- /dev/null
+++ b/branding/check-ca-crt.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+import re
+import sys
+import urllib.request
+
+SCRIPT_NAME = 'check-ca-crt.py'
+
+USAGE = '''Check that the stored provider CA matches the one announced online.
+Usage: {name} <provider> <uri>
+
+Example: {name} riseup black.riseup.net'''.format(name=SCRIPT_NAME)
+
+
+def getLocalCert(provider):
+    sanitized = re.sub(r'[^\w\s-]', '', provider).strip().lower()
+    with open('config/{provider}-ca.crt'.format(provider=sanitized)) as crt:
+        return crt.read().strip()
+
+
+def getRemoteCert(uri):
+    fp = urllib.request.urlopen('https://' + uri + '/ca.crt')
+    remote_cert = fp.read().decode('utf-8').strip()
+    fp.close()
+    return remote_cert
+
+
+if __name__ == '__main__':
+
+    if len(sys.argv) != 3:
+        print('[!] Not enough arguments')
+        print(USAGE)
+        sys.exit(1)
+
+    provider = sys.argv[1]
+    uri = sys.argv[2]
+
+    local = getLocalCert(provider)
+    remote = getRemoteCert(uri)
+
+    try:
+        assert local == remote
+    except AssertionError:
+        print('[!] ERROR: remote and local CA certs do not match')
+        sys.exit(1)
+    else:
+        print('OK')