diff --git a/letsencrypt-apache/letsencrypt_apache/configurator.py b/letsencrypt-apache/letsencrypt_apache/configurator.py index 1d4618825..4066d6264 100644 --- a/letsencrypt-apache/letsencrypt_apache/configurator.py +++ b/letsencrypt-apache/letsencrypt_apache/configurator.py @@ -8,6 +8,7 @@ import shutil import socket import time +import zope.component import zope.interface from acme import challenges @@ -709,6 +710,39 @@ class ApacheConfigurator(augeas_configurator.AugeasConfigurator): else: return non_ssl_vh_fp + self.conf("le_vhost_ext") + def _sift_line(self, line): + """Decides whether a line should be copied to a SSL vhost. + + A canonical example of when sifting a line is required: + When the http vhost contains a RewriteRule that unconditionally + redirects any request to the https version of the same site. + e.g: + RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [L,QSA,R=permanent] + Copying the above line to the ssl vhost would cause a + redirection loop. + + :param str line: a line extracted from the http vhost. + + :returns: True - don't copy line from http vhost to SSL vhost. + :rtype: bool + + """ + if not line.lstrip().startswith("RewriteRule"): + return False + + # According to: http://httpd.apache.org/docs/2.4/rewrite/flags.html + # The syntax of a RewriteRule is: + # RewriteRule pattern target [Flag1,Flag2,Flag3] + # i.e. target is required, so it must exist. + target = line.split()[2].strip() + + # target may be surrounded with quotes + if target[0] in ("'", '"') and target[0] == target[-1]: + target = target[1:-1] + + # Sift line if it redirects the request to a HTTPS site + return target.startswith("https://") + def _copy_create_ssl_vhost_skeleton(self, avail_fp, ssl_fp): """Copies over existing Vhost with IfModule mod_ssl.c> skeleton. @@ -721,18 +755,38 @@ class ApacheConfigurator(augeas_configurator.AugeasConfigurator): # First register the creation so that it is properly removed if # configuration is rolled back self.reverter.register_file_creation(False, ssl_fp) + sift = False try: with open(avail_fp, "r") as orig_file: with open(ssl_fp, "w") as new_file: new_file.write("\n") for line in orig_file: - new_file.write(line) + if self._sift_line(line): + if not sift: + new_file.write( + "# Some rewrite rules in this file were " + "were disabled on your HTTPS site,\n" + "# because they have the potential to " + "create redirection loops.\n") + sift = True + new_file.write("# " + line) + else: + new_file.write(line) new_file.write("\n") except IOError: logger.fatal("Error writing/reading to file in make_vhost_ssl") raise errors.PluginError("Unable to write/read in make_vhost_ssl") + if sift: + reporter = zope.component.getUtility(interfaces.IReporter) + reporter.add_message( + "Some rewrite rules copied from {0} were disabled in the " + "vhost for your HTTPS site located at {1} because they have " + "the potential to create redirection loops.".format(avail_fp, + ssl_fp), + reporter.MEDIUM_PRIORITY) + def _update_ssl_vhosts_addrs(self, vh_path): ssl_addrs = set() ssl_addr_p = self.aug.match(vh_path + "/arg") diff --git a/letsencrypt-apache/letsencrypt_apache/tests/configurator_test.py b/letsencrypt-apache/letsencrypt_apache/tests/configurator_test.py index 212f128f2..113b3b2b2 100644 --- a/letsencrypt-apache/letsencrypt_apache/tests/configurator_test.py +++ b/letsencrypt-apache/letsencrypt_apache/tests/configurator_test.py @@ -847,7 +847,8 @@ class TwoVhost80Test(util.ApacheTest): # Create a preexisting rewrite rule self.config.parser.add_dir( - self.vh_truth[3].path, "RewriteRule", ["Unknown"]) + self.vh_truth[3].path, "RewriteRule", ["UnknownPattern", + "UnknownTarget"]) self.config.save() # This will create an ssl vhost for letsencrypt.demo @@ -862,7 +863,7 @@ class TwoVhost80Test(util.ApacheTest): self.assertEqual(len(rw_engine), 1) # three args to rw_rule + 1 arg for the pre existing rewrite - self.assertEqual(len(rw_rule), 4) + self.assertEqual(len(rw_rule), 5) self.assertTrue(rw_engine[0].startswith(self.vh_truth[3].path)) self.assertTrue(rw_rule[0].startswith(self.vh_truth[3].path)) @@ -911,6 +912,44 @@ class TwoVhost80Test(util.ApacheTest): self.config._enable_redirect(self.vh_truth[1], "") # pylint: disable=protected-access self.assertEqual(len(self.config.vhosts), 7) + def test_sift_line(self): + # pylint: disable=protected-access + small_quoted_target = "RewriteRule ^ \"http://\"" + self.assertFalse(self.config._sift_line(small_quoted_target)) + + https_target = "RewriteRule ^ https://satoshi" + self.assertTrue(self.config._sift_line(https_target)) + + normal_target = "RewriteRule ^/(.*) http://www.a.com:1234/$1 [L,R]" + self.assertFalse(self.config._sift_line(normal_target)) + + @mock.patch("letsencrypt_apache.configurator.zope.component.getUtility") + def test_make_vhost_ssl_with_existing_rewrite_rule(self, mock_get_utility): + self.config.parser.modules.add("rewrite_module") + + http_vhost = self.vh_truth[0] + + self.config.parser.add_dir( + http_vhost.path, "RewriteEngine", "on") + + self.config.parser.add_dir( + http_vhost.path, "RewriteRule", + ["^", + "https://%{SERVER_NAME}%{REQUEST_URI}", + "[L,QSA,R=permanent]"]) + self.config.save() + + ssl_vhost = self.config.make_vhost_ssl(self.vh_truth[0]) + + self.assertTrue(self.config.parser.find_dir( + "RewriteEngine", "on", ssl_vhost.path, False)) + + conf_text = open(ssl_vhost.filep).read() + commented_rewrite_rule = \ + "# RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [L,QSA,R=permanent]" + self.assertTrue(commented_rewrite_rule in conf_text) + mock_get_utility().add_message.assert_called_once_with(mock.ANY, + mock.ANY) def get_achalls(self): """Return testing achallenges."""