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authorRemko Tronçon <git@el-tramo.be>2011-06-01 21:09:23 (GMT)
committerRemko Tronçon <git@el-tramo.be>2011-06-01 21:09:23 (GMT)
commit9928be64a4c19f497302963d23ed0efc66b899c0 (patch)
tree1227659abb5814ac28bab2eaa84aefda8ff3f7a6
parent3f72e2c3b7ce5a83287dc136c68b7ef6d2cc66bd (diff)
downloadswift-contrib-9928be64a4c19f497302963d23ed0efc66b899c0.zip
swift-contrib-9928be64a4c19f497302963d23ed0efc66b899c0.tar.bz2
Added fix for a billion laughs attack on Expat.
Diffstat
-rw-r--r--Swiften/Parser/ExpatParser.cpp19
-rw-r--r--Swiften/Parser/ExpatParser.h4
-rw-r--r--Swiften/Parser/LibXMLParser.cpp14
-rw-r--r--Swiften/Parser/UnitTest/XMLParserTest.cpp43
-rw-r--r--Swiften/Parser/XMLParser.h1
5 files changed, 66 insertions, 15 deletions
diff --git a/Swiften/Parser/ExpatParser.cpp b/Swiften/Parser/ExpatParser.cpp
index 88be752..f091f79 100644
--- a/Swiften/Parser/ExpatParser.cpp
+++ b/Swiften/Parser/ExpatParser.cpp
@@ -16,7 +16,7 @@ namespace Swift {
static const char NAMESPACE_SEPARATOR = '\x01';
-static void handleStartElement(void* client, const XML_Char* name, const XML_Char** attributes) {
+static void handleStartElement(void* parser, const XML_Char* name, const XML_Char** attributes) {
std::pair<std::string,std::string> nsTagPair = String::getSplittedAtFirst(name, NAMESPACE_SEPARATOR);
if (nsTagPair.second == "") {
nsTagPair.second = nsTagPair.first;
@@ -34,32 +34,37 @@ static void handleStartElement(void* client, const XML_Char* name, const XML_Cha
currentAttribute += 2;
}
- static_cast<XMLParserClient*>(client)->handleStartElement(nsTagPair.second, nsTagPair.first, attributeValues);
+ static_cast<XMLParser*>(parser)->getClient()->handleStartElement(nsTagPair.second, nsTagPair.first, attributeValues);
}
-static void handleEndElement(void* client, const XML_Char* name) {
+static void handleEndElement(void* parser, const XML_Char* name) {
std::pair<std::string,std::string> nsTagPair = String::getSplittedAtFirst(name, NAMESPACE_SEPARATOR);
if (nsTagPair.second == "") {
nsTagPair.second = nsTagPair.first;
nsTagPair.first = "";
}
- static_cast<XMLParserClient*>(client)->handleEndElement(nsTagPair.second, nsTagPair.first);
+ static_cast<XMLParser*>(parser)->getClient()->handleEndElement(nsTagPair.second, nsTagPair.first);
}
-static void handleCharacterData(void* client, const XML_Char* data, int len) {
- static_cast<XMLParserClient*>(client)->handleCharacterData(std::string(data, len));
+static void handleCharacterData(void* parser, const XML_Char* data, int len) {
+ static_cast<XMLParser*>(parser)->getClient()->handleCharacterData(std::string(data, len));
}
static void handleXMLDeclaration(void*, const XML_Char*, const XML_Char*, int) {
}
+static void handleEntityDeclaration(void* parser, const XML_Char*, int, const XML_Char*, int, const XML_Char*, const XML_Char*, const XML_Char*, const XML_Char*) {
+ XML_StopParser(static_cast<ExpatParser*>(parser)->getParser(), static_cast<XML_Bool>(0));
+}
+
ExpatParser::ExpatParser(XMLParserClient* client) : XMLParser(client) {
parser_ = XML_ParserCreateNS("UTF-8", NAMESPACE_SEPARATOR);
- XML_SetUserData(parser_, client);
+ XML_SetUserData(parser_, this);
XML_SetElementHandler(parser_, handleStartElement, handleEndElement);
XML_SetCharacterDataHandler(parser_, handleCharacterData);
XML_SetXmlDeclHandler(parser_, handleXMLDeclaration);
+ XML_SetEntityDeclHandler(parser_, handleEntityDeclaration);
}
ExpatParser::~ExpatParser() {
diff --git a/Swiften/Parser/ExpatParser.h b/Swiften/Parser/ExpatParser.h
index f6faf17..cd981ef 100644
--- a/Swiften/Parser/ExpatParser.h
+++ b/Swiften/Parser/ExpatParser.h
@@ -20,6 +20,10 @@ namespace Swift {
bool parse(const std::string& data);
+ XML_Parser getParser() {
+ return parser_;
+ }
+
private:
XML_Parser parser_;
};
diff --git a/Swiften/Parser/LibXMLParser.cpp b/Swiften/Parser/LibXMLParser.cpp
index 34db4ca..c94a360 100644
--- a/Swiften/Parser/LibXMLParser.cpp
+++ b/Swiften/Parser/LibXMLParser.cpp
@@ -15,20 +15,20 @@
namespace Swift {
-static void handleStartElement(void *client, const xmlChar* name, const xmlChar*, const xmlChar* xmlns, int, const xmlChar**, int nbAttributes, int, const xmlChar ** attributes) {
+static void handleStartElement(void *parser, const xmlChar* name, const xmlChar*, const xmlChar* xmlns, int, const xmlChar**, int nbAttributes, int, const xmlChar ** attributes) {
AttributeMap attributeValues;
for (int i = 0; i < nbAttributes*5; i += 5) {
attributeValues[std::string(reinterpret_cast<const char*>(attributes[i]))] = std::string(reinterpret_cast<const char*>(attributes[i+3]), attributes[i+4]-attributes[i+3]);
}
- static_cast<XMLParserClient*>(client)->handleStartElement(reinterpret_cast<const char*>(name), (xmlns ? reinterpret_cast<const char*>(xmlns) : std::string()), attributeValues);
+ static_cast<XMLParser*>(parser)->getClient()->handleStartElement(reinterpret_cast<const char*>(name), (xmlns ? reinterpret_cast<const char*>(xmlns) : std::string()), attributeValues);
}
-static void handleEndElement(void *client, const xmlChar* name, const xmlChar*, const xmlChar* xmlns) {
- static_cast<XMLParserClient*>(client)->handleEndElement(reinterpret_cast<const char*>(name), (xmlns ? reinterpret_cast<const char*>(xmlns) : std::string()));
+static void handleEndElement(void *parser, const xmlChar* name, const xmlChar*, const xmlChar* xmlns) {
+ static_cast<XMLParser*>(parser)->getClient()->handleEndElement(reinterpret_cast<const char*>(name), (xmlns ? reinterpret_cast<const char*>(xmlns) : std::string()));
}
-static void handleCharacterData(void* client, const xmlChar* data, int len) {
- static_cast<XMLParserClient*>(client)->handleCharacterData(std::string(reinterpret_cast<const char*>(data), len));
+static void handleCharacterData(void* parser, const xmlChar* data, int len) {
+ static_cast<XMLParser*>(parser)->getClient()->handleCharacterData(std::string(reinterpret_cast<const char*>(data), len));
}
static void handleError(void*, const char* /*m*/, ... ) {
@@ -54,7 +54,7 @@ LibXMLParser::LibXMLParser(XMLParserClient* client) : XMLParser(client) {
handler_.warning = &handleWarning;
handler_.error = &handleError;
- context_ = xmlCreatePushParserCtxt(&handler_, client, 0, 0, 0);
+ context_ = xmlCreatePushParserCtxt(&handler_, this, 0, 0, 0);
assert(context_);
}
diff --git a/Swiften/Parser/UnitTest/XMLParserTest.cpp b/Swiften/Parser/UnitTest/XMLParserTest.cpp
index 426b7a0..2086ece 100644
--- a/Swiften/Parser/UnitTest/XMLParserTest.cpp
+++ b/Swiften/Parser/UnitTest/XMLParserTest.cpp
@@ -25,12 +25,14 @@ class XMLParserTest : public CppUnit::TestFixture {
CPPUNIT_TEST(testParse_NestedElements);
CPPUNIT_TEST(testParse_ElementInNamespacedElement);
CPPUNIT_TEST(testParse_CharacterData);
+ CPPUNIT_TEST(testParse_XMLEntity);
CPPUNIT_TEST(testParse_NamespacePrefix);
CPPUNIT_TEST(testParse_UnhandledXML);
CPPUNIT_TEST(testParse_InvalidXML);
CPPUNIT_TEST(testParse_InErrorState);
CPPUNIT_TEST(testParse_Incremental);
CPPUNIT_TEST(testParse_WhitespaceInAttribute);
+ CPPUNIT_TEST(testParse_BillionLaughs);
CPPUNIT_TEST_SUITE_END();
public:
@@ -124,6 +126,26 @@ class XMLParserTest : public CppUnit::TestFixture {
CPPUNIT_ASSERT_EQUAL(std::string("html"), client_.events[6].data);
}
+ void testParse_XMLEntity() {
+ ParserType testling(&client_);
+
+ CPPUNIT_ASSERT(testling.parse("<html>&lt;&gt;</html>"));
+
+ CPPUNIT_ASSERT_EQUAL(static_cast<size_t>(4), client_.events.size());
+
+ CPPUNIT_ASSERT_EQUAL(Client::StartElement, client_.events[0].type);
+ CPPUNIT_ASSERT_EQUAL(std::string("html"), client_.events[0].data);
+
+ CPPUNIT_ASSERT_EQUAL(Client::CharacterData, client_.events[1].type);
+ CPPUNIT_ASSERT_EQUAL(std::string("<"), client_.events[1].data);
+
+ CPPUNIT_ASSERT_EQUAL(Client::CharacterData, client_.events[2].type);
+ CPPUNIT_ASSERT_EQUAL(std::string(">"), client_.events[2].data);
+
+ CPPUNIT_ASSERT_EQUAL(Client::EndElement, client_.events[3].type);
+ CPPUNIT_ASSERT_EQUAL(std::string("html"), client_.events[3].data);
+ }
+
void testParse_NamespacePrefix() {
ParserType testling(&client_);
@@ -205,6 +227,27 @@ class XMLParserTest : public CppUnit::TestFixture {
CPPUNIT_ASSERT_EQUAL(Client::EndElement, client_.events[2].type);
CPPUNIT_ASSERT_EQUAL(std::string("presence"), client_.events[2].data);
}
+
+ void testParse_BillionLaughs() {
+ ParserType testling(&client_);
+
+ CPPUNIT_ASSERT(!testling.parse(
+ "<?xml version=\"1.0\"?>"
+ "<!DOCTYPE lolz ["
+ " <!ENTITY lol \"lol\">"
+ " <!ENTITY lol2 \"&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;\">"
+ " <!ENTITY lol3 \"&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;\">"
+ " <!ENTITY lol4 \"&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;\">"
+ " <!ENTITY lol5 \"&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;\">"
+ " <!ENTITY lol6 \"&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;\">"
+ " <!ENTITY lol7 \"&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;\">"
+ " <!ENTITY lol8 \"&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;\">"
+ " <!ENTITY lol9 \"&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;\">"
+ "]>"
+ "<lolz>&lol9;</lolz>"
+ ));
+
+ }
private:
class Client : public XMLParserClient {
diff --git a/Swiften/Parser/XMLParser.h b/Swiften/Parser/XMLParser.h
index 69a6ecf..1b866e3 100644
--- a/Swiften/Parser/XMLParser.h
+++ b/Swiften/Parser/XMLParser.h
@@ -19,7 +19,6 @@ namespace Swift {
virtual bool parse(const std::string& data) = 0;
- protected:
XMLParserClient* getClient() const {
return client_;
}