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From 979daae300916adb399ab5b51410b6ebd0888f13 Mon Sep 17 00:00:00 2001
From: Xtreak <tir.karthi@gmail.com>
Date: Sat, 15 Jun 2019 20:59:43 +0530
Subject: [PATCH] [2.7] bpo-35121: prefix dot in domain for proper subdomain
validation (GH-10258) (GH-13426)
This is a manual backport of ca7fe5063593958e5efdf90f068582837f07bd14 since 2.7 has `http.cookiejar` in `cookielib`
https://bugs.python.org/issue35121
CVE: CVE-2018-20852
Upstream-Status: Backport [https://github.com/python/cpython/pull/13426]
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
---
Lib/cookielib.py | 13 ++++++--
Lib/test/test_cookielib.py | 30 +++++++++++++++++++
.../2019-05-20-00-35-12.bpo-35121.RRi-HU.rst | 4 +++
3 files changed, 45 insertions(+), 2 deletions(-)
create mode 100644 Misc/NEWS.d/next/Security/2019-05-20-00-35-12.bpo-35121.RRi-HU.rst
diff --git a/Lib/cookielib.py b/Lib/cookielib.py
index 2dd7c48728e0..0b471a42f296 100644
--- a/Lib/cookielib.py
+++ b/Lib/cookielib.py
@@ -1139,6 +1139,11 @@ def return_ok_domain(self, cookie, request):
req_host, erhn = eff_request_host(request)
domain = cookie.domain
+ if domain and not domain.startswith("."):
+ dotdomain = "." + domain
+ else:
+ dotdomain = domain
+
# strict check of non-domain cookies: Mozilla does this, MSIE5 doesn't
if (cookie.version == 0 and
(self.strict_ns_domain & self.DomainStrictNonDomain) and
@@ -1151,7 +1156,7 @@ def return_ok_domain(self, cookie, request):
_debug(" effective request-host name %s does not domain-match "
"RFC 2965 cookie domain %s", erhn, domain)
return False
- if cookie.version == 0 and not ("."+erhn).endswith(domain):
+ if cookie.version == 0 and not ("."+erhn).endswith(dotdomain):
_debug(" request-host %s does not match Netscape cookie domain "
"%s", req_host, domain)
return False
@@ -1165,7 +1170,11 @@ def domain_return_ok(self, domain, request):
req_host = "."+req_host
if not erhn.startswith("."):
erhn = "."+erhn
- if not (req_host.endswith(domain) or erhn.endswith(domain)):
+ if domain and not domain.startswith("."):
+ dotdomain = "." + domain
+ else:
+ dotdomain = domain
+ if not (req_host.endswith(dotdomain) or erhn.endswith(dotdomain)):
#_debug(" request domain %s does not match cookie domain %s",
# req_host, domain)
return False
diff --git a/Lib/test/test_cookielib.py b/Lib/test/test_cookielib.py
index f2dd9727d137..7f7ff614d61d 100644
--- a/Lib/test/test_cookielib.py
+++ b/Lib/test/test_cookielib.py
@@ -368,6 +368,7 @@ def test_domain_return_ok(self):
("http://foo.bar.com/", ".foo.bar.com", True),
("http://foo.bar.com/", "foo.bar.com", True),
("http://foo.bar.com/", ".bar.com", True),
+ ("http://foo.bar.com/", "bar.com", True),
("http://foo.bar.com/", "com", True),
("http://foo.com/", "rhubarb.foo.com", False),
("http://foo.com/", ".foo.com", True),
@@ -378,6 +379,8 @@ def test_domain_return_ok(self):
("http://foo/", "foo", True),
("http://foo/", "foo.local", True),
("http://foo/", ".local", True),
+ ("http://barfoo.com", ".foo.com", False),
+ ("http://barfoo.com", "foo.com", False),
]:
request = urllib2.Request(url)
r = pol.domain_return_ok(domain, request)
@@ -938,6 +941,33 @@ def test_domain_block(self):
c.add_cookie_header(req)
self.assertFalse(req.has_header("Cookie"))
+ c.clear()
+
+ pol.set_blocked_domains([])
+ req = Request("http://acme.com/")
+ res = FakeResponse(headers, "http://acme.com/")
+ cookies = c.make_cookies(res, req)
+ c.extract_cookies(res, req)
+ self.assertEqual(len(c), 1)
+
+ req = Request("http://acme.com/")
+ c.add_cookie_header(req)
+ self.assertTrue(req.has_header("Cookie"))
+
+ req = Request("http://badacme.com/")
+ c.add_cookie_header(req)
+ self.assertFalse(pol.return_ok(cookies[0], req))
+ self.assertFalse(req.has_header("Cookie"))
+
+ p = pol.set_blocked_domains(["acme.com"])
+ req = Request("http://acme.com/")
+ c.add_cookie_header(req)
+ self.assertFalse(req.has_header("Cookie"))
+
+ req = Request("http://badacme.com/")
+ c.add_cookie_header(req)
+ self.assertFalse(req.has_header("Cookie"))
+
def test_secure(self):
from cookielib import CookieJar, DefaultCookiePolicy
diff --git a/Misc/NEWS.d/next/Security/2019-05-20-00-35-12.bpo-35121.RRi-HU.rst b/Misc/NEWS.d/next/Security/2019-05-20-00-35-12.bpo-35121.RRi-HU.rst
new file mode 100644
index 000000000000..77251806163b
--- /dev/null
+++ b/Misc/NEWS.d/next/Security/2019-05-20-00-35-12.bpo-35121.RRi-HU.rst
@@ -0,0 +1,4 @@
+Don't send cookies of domain A without Domain attribute to domain B when
+domain A is a suffix match of domain B while using a cookiejar with
+:class:`cookielib.DefaultCookiePolicy` policy. Patch by Karthikeyan
+Singaravelan.
|
