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69 lines
2.5 KiB
69 lines
2.5 KiB
6 years ago
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Index: gnome-vfs-2.24.2/imported/neon/ne_xml.c
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===================================================================
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--- gnome-vfs-2.24.2/imported/neon/ne_xml.c (revision 1687)
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+++ gnome-vfs-2.24.2/imported/neon/ne_xml.c (revision 1688)
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@@ -405,6 +405,28 @@
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destroy_element(elm);
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}
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+#if defined(HAVE_EXPAT) && XML_MAJOR_VERSION > 1
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+/* Stop the parser if an entity declaration is hit. */
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+static void entity_declaration(void *userData, const XML_Char *entityName,
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+ int is_parameter_entity, const XML_Char *value,
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+ int value_length, const XML_Char *base,
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+ const XML_Char *systemId, const XML_Char *publicId,
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+ const XML_Char *notationName)
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+{
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+ ne_xml_parser *parser = userData;
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+
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+ NE_DEBUG(NE_DBG_XMLPARSE, "XML: entity declaration [%s]. Failing.\n",
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+ entityName);
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+
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+ XML_StopParser(parser->parser, XML_FALSE);
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+}
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+#elif defined(HAVE_EXPAT)
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+/* A noop default_handler. */
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+static void default_handler(void *userData, const XML_Char *s, int len)
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+{
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+}
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+#endif
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+
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/* Find a namespace definition for 'prefix' in given element, where
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* length of prefix is 'pfxlen'. Returns the URI or NULL. */
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static const char *resolve_nspace(const struct element *elm,
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@@ -459,14 +481,34 @@
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XML_SetCharacterDataHandler(p->parser, char_data);
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XML_SetUserData(p->parser, (void *) p);
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XML_SetXmlDeclHandler(p->parser, decl_handler);
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+
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+ /* Prevent the "billion laughs" attack against expat by disabling
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+ * internal entity expansion. With 2.x, forcibly stop the parser
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+ * if an entity is declared - this is safer and a more obvious
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+ * failure mode. With older versions, installing a noop
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+ * DefaultHandler means that internal entities will be expanded as
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+ * the empty string, which is also sufficient to prevent the
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+ * attack. */
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+#if XML_MAJOR_VERSION > 1
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+ XML_SetEntityDeclHandler(p->parser, entity_declaration);
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#else
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+ XML_SetDefaultHandler(p->parser, default_handler);
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+#endif
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+
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+#else /* HAVE_LIBXML */
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p->parser = xmlCreatePushParserCtxt(&sax_handler,
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(void *)p, NULL, 0, NULL);
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if (p->parser == NULL) {
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abort();
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}
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+#if LIBXML_VERSION < 20602
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p->parser->replaceEntities = 1;
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+#else
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+ /* Enable expansion of entities, and disable network access. */
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+ xmlCtxtUseOptions(p->parser, XML_PARSE_NOENT | XML_PARSE_NONET);
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#endif
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+
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+#endif /* HAVE_LIBXML || HAVE_EXPAT */
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return p;
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}
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