Generate default ciphers using approach from #1501

Author: jkbrzt

httpie/cli/definition.py

@@ -20,7 +20,7 @@
                                              get_available_styles)
 from httpie.plugins.builtin import BuiltinAuthPlugin
 from httpie.plugins.registry import plugin_manager
-from httpie.ssl_ import AVAILABLE_SSL_VERSION_ARG_MAPPING, DEFAULT_SSL_CIPHERS
+from httpie.ssl_ import AVAILABLE_SSL_VERSION_ARG_MAPPING, DEFAULT_SSL_CIPHERS_STRING
 
 options = ParserSpec(
     'http',
@@ -832,9 +832,9 @@ def format_auth_help(auth_plugins_mapping, *, isolation_mode: bool = False):
     help=f"""
 
     A string in the OpenSSL cipher list format. By default, the following
-    is used:
+    ciphers are used on your system:
 
-    {DEFAULT_SSL_CIPHERS}
+    {DEFAULT_SSL_CIPHERS_STRING}
 
     """,
 )

httpie/ssl_.py

@@ -8,46 +8,7 @@
     resolve_ssl_version,
 )
 
-# We used to import default SSL ciphers via `SSL_CIPHERS` from `urllib3` but it’s been removed,
-# so we’ve copied the original list here.
-# Our issue: <https://github.com/httpie/httpie/issues/1499>
-# Removal commit: <https://github.com/urllib3/urllib3/commit/e5eac0c>
-DEFAULT_SSL_CIPHERS = ":".join([
-    # <urllib3>
-    # A secure default.
-    # Sources for more information on TLS ciphers:
-    #
-    # - https://wiki.mozilla.org/Security/Server_Side_TLS
-    # - https://www.ssllabs.com/projects/best-practices/index.html
-    # - https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
-    #
-    # The general intent is:
-    # - prefer cipher suites that offer perfect forward secrecy (DHE/ECDHE),
-    # - prefer ECDHE over DHE for better performance,
-    # - prefer any AES-GCM and ChaCha20 over any AES-CBC for better performance and
-    #   security,
-    # - prefer AES-GCM over ChaCha20 because hardware-accelerated AES is common,
-    # - disable NULL authentication, MD5 MACs, DSS, and other
-    #   insecure ciphers for security reasons.
-    # - NOTE: TLS 1.3 cipher suites are managed through a different interface
-    #   not exposed by CPython (yet!) and are enabled by default if they're available.
-    "ECDHE+AESGCM",
-    "ECDHE+CHACHA20",
-    "DHE+AESGCM",
-    "DHE+CHACHA20",
-    "ECDH+AESGCM",
-    "DH+AESGCM",
-    "ECDH+AES",
-    "DH+AES",
-    "RSA+AESGCM",
-    "RSA+AES",
-    "!aNULL",
-    "!eNULL",
-    "!MD5",
-    "!DSS",
-    "!AESCCM",
-    # </urllib3>
-])
+
 SSL_VERSION_ARG_MAPPING = {
     'ssl2.3': 'PROTOCOL_SSLv23',
     'ssl3': 'PROTOCOL_SSLv3',
@@ -119,6 +80,10 @@ def _create_ssl_context(
             cert_reqs=ssl.CERT_REQUIRED if verify else ssl.CERT_NONE
         )
 
+    @classmethod
+    def get_default_ciphers_names(cls):
+        return [cipher['name'] for cipher in cls._create_ssl_context(verify=False).get_ciphers()]
+
 
 def _is_key_file_encrypted(key_file):
     """Detects if a key file is encrypted or not.
@@ -132,3 +97,9 @@ def _is_key_file_encrypted(key_file):
                 return True
 
     return False
+
+
+# We used to import the default set of TLS ciphers from urllib3, but they removed it.
+# Instead, now urllib3 uses the list of ciphers configured by the system.
+# <https://github.com/httpie/httpie/pull/1501>
+DEFAULT_SSL_CIPHERS_STRING = ':'.join(HTTPieHTTPSAdapter.get_default_ciphers_names())

tests/test_ssl.py

@@ -7,7 +7,7 @@
 
 from unittest import mock
 
-from httpie.ssl_ import AVAILABLE_SSL_VERSION_ARG_MAPPING, DEFAULT_SSL_CIPHERS
+from httpie.ssl_ import AVAILABLE_SSL_VERSION_ARG_MAPPING, DEFAULT_SSL_CIPHERS_STRING
 from httpie.status import ExitStatus
 
 from .utils import HTTP_OK, TESTS_ROOT, IS_PYOPENSSL, http
@@ -146,7 +146,7 @@ def test_ciphers(httpbin_secure):
     r = http(
         httpbin_secure.url + '/get',
         '--ciphers',
-        DEFAULT_SSL_CIPHERS,
+        DEFAULT_SSL_CIPHERS_STRING,
     )
     assert HTTP_OK in r