Attachment 696353 Details for Bug 910222 – cinder-folsom-CVE-2013-0279.patch

[patch] cinder-folsom-CVE-2013-0279.patch

cinder-folsom-CVE-2013-0279.patch (text/plain), 9.42 KB, created by Kurt Seifried on 2013-02-12 03:58:43 UTC

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Creator: Kurt Seifried

Created: 2013-02-12 03:58:43 UTC

Size: 9.42 KB

patch

obsolete

>From fcf249d1f06938280d841cb13b61556971a58e0c Mon Sep 17 00:00:00 2001
>From: Dan Prince <dprince@redhat.com>
>Date: Sun, 3 Feb 2013 22:25:12 -0500
>Subject: [PATCH] Add a safe_minidom_parse_string function.
>
>Adds a new utils.safe_minidom_parse_string function and
>updates external API facing Cinder modules to use it.
>This ensures we have safe defaults on our incoming API XML parsing.
>
>Internally safe_minidom_parse_string uses a ProtectedExpatParser
>class to disable DTDs and entities from being parsed when using
>minidom.
>
>Fixes LP Bug #1100282 for Folsom.
>
>Change-Id: Ie8ae7a6e12fbf51de406d10ca21072140374abf5
>---
> cinder/api/openstack/common.py                     |  9 +++--
> .../api/openstack/volume/contrib/volume_actions.py |  4 +-
> cinder/api/openstack/volume/volumes.py             |  3 +-
> cinder/api/openstack/wsgi.py                       |  5 ++-
> cinder/tests/test_utils.py                         | 33 ++++++++++++++++
> cinder/utils.py                                    | 44 ++++++++++++++++++++++
> 6 files changed, 88 insertions(+), 10 deletions(-)
>
>diff --git a/cinder/api/openstack/common.py b/cinder/api/openstack/common.py
>index 255a0a7..91e488f 100644
>--- a/cinder/api/openstack/common.py
>+++ b/cinder/api/openstack/common.py
>@@ -25,6 +25,7 @@ from cinder import flags
> from cinder.api.openstack import wsgi
> from cinder.api.openstack import xmlutil
> from cinder.openstack.common import log as logging
>+from cinder import utils
> 
> 
> LOG = logging.getLogger(__name__)
>@@ -247,7 +248,7 @@ class ViewBuilder(object):
> 
> class MetadataDeserializer(wsgi.MetadataXMLDeserializer):
>     def deserialize(self, text):
>-        dom = minidom.parseString(text)
>+        dom = utils.safe_minidom_parse_string(text)
>         metadata_node = self.find_first_child_named(dom, "metadata")
>         metadata = self.extract_metadata(metadata_node)
>         return {'body': {'metadata': metadata}}
>@@ -255,7 +256,7 @@ class MetadataDeserializer(wsgi.MetadataXMLDeserializer):
> 
> class MetaItemDeserializer(wsgi.MetadataXMLDeserializer):
>     def deserialize(self, text):
>-        dom = minidom.parseString(text)
>+        dom = utils.safe_minidom_parse_string(text)
>         metadata_item = self.extract_metadata(dom)
>         return {'body': {'meta': metadata_item}}
> 
>@@ -273,7 +274,7 @@ class MetadataXMLDeserializer(wsgi.XMLDeserializer):
>         return metadata
> 
>     def _extract_metadata_container(self, datastring):
>-        dom = minidom.parseString(datastring)
>+        dom = utils.safe_minidom_parse_string(datastring)
>         metadata_node = self.find_first_child_named(dom, "metadata")
>         metadata = self.extract_metadata(metadata_node)
>         return {'body': {'metadata': metadata}}
>@@ -285,7 +286,7 @@ class MetadataXMLDeserializer(wsgi.XMLDeserializer):
>         return self._extract_metadata_container(datastring)
> 
>     def update(self, datastring):
>-        dom = minidom.parseString(datastring)
>+        dom = utils.safe_minidom_parse_string(datastring)
>         metadata_item = self.extract_metadata(dom)
>         return {'body': {'meta': metadata_item}}
> 
>diff --git a/cinder/api/openstack/volume/contrib/volume_actions.py b/cinder/api/openstack/volume/contrib/volume_actions.py
>index 5c62766..eac8f17 100644
>--- a/cinder/api/openstack/volume/contrib/volume_actions.py
>+++ b/cinder/api/openstack/volume/contrib/volume_actions.py
>@@ -13,7 +13,6 @@
> #   under the License.
> 
> import webob
>-from xml.dom import minidom
> 
> from cinder.api.openstack import extensions
> from cinder.api.openstack import wsgi
>@@ -23,6 +22,7 @@ from cinder import exception
> from cinder import flags
> from cinder.openstack.common import log as logging
> from cinder.openstack.common.rpc import common as rpc_common
>+from cinder import utils
> 
> 
> FLAGS = flags.FLAGS
>@@ -54,7 +54,7 @@ class VolumeToImageSerializer(xmlutil.TemplateBuilder):
> class VolumeToImageDeserializer(wsgi.XMLDeserializer):
>     """Deserializer to handle xml-formatted requests"""
>     def default(self, string):
>-        dom = minidom.parseString(string)
>+        dom = utils.safe_minidom_parse_string(string)
>         action_node = dom.childNodes[0]
>         action_name = action_node.tagName
> 
>diff --git a/cinder/api/openstack/volume/volumes.py b/cinder/api/openstack/volume/volumes.py
>index 2c6852b..675c51f 100644
>--- a/cinder/api/openstack/volume/volumes.py
>+++ b/cinder/api/openstack/volume/volumes.py
>@@ -17,7 +17,6 @@
> 
> from webob import exc
> import webob
>-from xml.dom import minidom
> 
> from cinder.api.openstack import common
> from cinder.api.openstack import wsgi
>@@ -194,7 +193,7 @@ class CreateDeserializer(CommonDeserializer):
> 
>     def default(self, string):
>         """Deserialize an xml-formatted volume create request."""
>-        dom = minidom.parseString(string)
>+        dom = utils.safe_minidom_parse_string(string)
>         volume = self._extract_volume(dom)
>         return {'body': {'volume': volume}}
> 
>diff --git a/cinder/api/openstack/wsgi.py b/cinder/api/openstack/wsgi.py
>index fa0baea..6a19e02 100644
>--- a/cinder/api/openstack/wsgi.py
>+++ b/cinder/api/openstack/wsgi.py
>@@ -24,6 +24,7 @@ from cinder import exception
> from cinder import wsgi
> from cinder.openstack.common import log as logging
> from cinder.openstack.common import jsonutils
>+from cinder import utils
> 
> from lxml import etree
> from xml.dom import minidom
>@@ -151,7 +152,7 @@ class XMLDeserializer(TextDeserializer):
>         plurals = set(self.metadata.get('plurals', {}))
> 
>         try:
>-            node = minidom.parseString(datastring).childNodes[0]
>+            node = utils.safe_minidom_parse_string(datastring).childNodes[0]
>             return {node.nodeName: self._from_xml_node(node, plurals)}
>         except expat.ExpatError:
>             msg = _("cannot understand XML")
>@@ -548,7 +549,7 @@ def action_peek_json(body):
> def action_peek_xml(body):
>     """Determine action to invoke."""
> 
>-    dom = minidom.parseString(body)
>+    dom = utils.safe_minidom_parse_string(body)
>     action_node = dom.childNodes[0]
> 
>     return action_node.tagName
>diff --git a/cinder/tests/test_utils.py b/cinder/tests/test_utils.py
>index 92be797..c7cf47d 100644
>--- a/cinder/tests/test_utils.py
>+++ b/cinder/tests/test_utils.py
>@@ -423,6 +423,39 @@ class GenericUtilsTestCase(test.TestCase):
>         result = utils.service_is_up(service)
>         self.assertFalse(result)
> 
>+    def test_safe_parse_xml(self):
>+
>+        normal_body = ("""
>+                 <?xml version="1.0" ?><foo>
>+                    <bar>
>+                        <v1>hey</v1>
>+                        <v2>there</v2>
>+                    </bar>
>+                </foo>""").strip()
>+
>+        def killer_body():
>+            return (("""<!DOCTYPE x [
>+                    <!ENTITY a "%(a)s">
>+                    <!ENTITY b "%(b)s">
>+                    <!ENTITY c "%(c)s">]>
>+                <foo>
>+                    <bar>
>+                        <v1>%(d)s</v1>
>+                    </bar>
>+                </foo>""") % {
>+                'a': 'A' * 10,
>+                'b': '&a;' * 10,
>+                'c': '&b;' * 10,
>+                'd': '&c;' * 9999,
>+            }).strip()
>+
>+        dom = utils.safe_minidom_parse_string(normal_body)
>+        self.assertEqual(normal_body, str(dom.toxml()))
>+
>+        self.assertRaises(ValueError,
>+                          utils.safe_minidom_parse_string,
>+                          killer_body())
>+
>     def test_xhtml_escape(self):
>         self.assertEqual('&quot;foo&quot;', utils.xhtml_escape('"foo"'))
>         self.assertEqual('&apos;foo&apos;', utils.xhtml_escape("'foo'"))
>diff --git a/cinder/utils.py b/cinder/utils.py
>index 100bbd6..6733369 100644
>--- a/cinder/utils.py
>+++ b/cinder/utils.py
>@@ -42,6 +42,10 @@ import time
> import types
> import uuid
> import warnings
>+from xml.dom import minidom
>+from xml.parsers import expat
>+from xml import sax
>+from xml.sax import expatreader
> from xml.sax import saxutils
> 
> from eventlet import event
>@@ -542,6 +546,46 @@ class LoopingCall(object):
>         return self.done.wait()
> 
> 
>+class ProtectedExpatParser(expatreader.ExpatParser):
>+    """An expat parser which disables DTD's and entities by default."""
>+
>+    def __init__(self, forbid_dtd=True, forbid_entities=True,
>+                 *args, **kwargs):
>+        # Python 2.x old style class
>+        expatreader.ExpatParser.__init__(self, *args, **kwargs)
>+        self.forbid_dtd = forbid_dtd
>+        self.forbid_entities = forbid_entities
>+
>+    def start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
>+        raise ValueError("Inline DTD forbidden")
>+
>+    def entity_decl(self, entityName, is_parameter_entity, value, base,
>+                    systemId, publicId, notationName):
>+        raise ValueError("<!ENTITY> forbidden")
>+
>+    def unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
>+        # expat 1.2
>+        raise ValueError("<!ENTITY> forbidden")
>+
>+    def reset(self):
>+        expatreader.ExpatParser.reset(self)
>+        if self.forbid_dtd:
>+            self._parser.StartDoctypeDeclHandler = self.start_doctype_decl
>+        if self.forbid_entities:
>+            self._parser.EntityDeclHandler = self.entity_decl
>+            self._parser.UnparsedEntityDeclHandler = self.unparsed_entity_decl
>+
>+
>+def safe_minidom_parse_string(xml_string):
>+    """Parse an XML string using minidom safely.
>+
>+    """
>+    try:
>+        return minidom.parseString(xml_string, parser=ProtectedExpatParser())
>+    except sax.SAXParseException as se:
>+        raise expat.ExpatError()
>+
>+
> def xhtml_escape(value):
>     """Escapes a string so it is valid within XML or XHTML.
> 
>-- 
>1.8.1
>

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