From 5f3658197bf29c83b3349b0ab1d99cdb0c3814bc Mon Sep 17 00:00:00 2001
From: "Doug Flick via groups.io" <dougflick=microsoft.com@groups.io>
Date: Fri, 26 Jan 2024 05:54:45 +0800
Subject: [PATCH] NetworkPkg: Dhcp6Dxe: SECURITY PATCH CVE-2023-45230 Unit 
 Tests

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4535

Confirms that reported issue...

"Buffer overflow in the DHCPv6 client via a long Server ID option"

..has been corrected by the provided patch.

Tests the following functions to ensure they appropriately handle
untrusted data (either too long or too small) to prevent a buffer
overflow:

Dhcp6AppendOption
Dhcp6AppendETOption
Dhcp6AppendIaOption

Cc: Saloni Kasbekar <saloni.kasbekar@intel.com>
Cc: Zachary Clark-williams <zachary.clark-williams@intel.com>

Signed-off-by: Doug Flick [MSFT] <doug.edk2@gmail.com>
Reviewed-by: Saloni Kasbekar <saloni.kasbekar@intel.com>

CVE: CVE-2023-45230

Upstream-Status: Backport [https://github.com/tianocore/edk2/commit/5f3658197bf29c83b3349b0ab1d99cdb0c3814bc]

Signed-off-by: Soumya Sambu <soumya.sambu@windriver.com>
---
 .../GoogleTest/Dhcp6DxeGoogleTest.cpp         |  20 +
 .../GoogleTest/Dhcp6DxeGoogleTest.inf         |  43 ++
 .../Dhcp6Dxe/GoogleTest/Dhcp6IoGoogleTest.cpp | 478 ++++++++++++++++++
 3 files changed, 541 insertions(+)
 create mode 100644 NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6DxeGoogleTest.cpp
 create mode 100644 NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6DxeGoogleTest.inf
 create mode 100644 NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6IoGoogleTest.cpp

diff --git a/NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6DxeGoogleTest.cpp b/NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6DxeGoogleTest.cpp
new file mode 100644
index 0000000000..9aeced2f91
--- /dev/null
+++ b/NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6DxeGoogleTest.cpp
@@ -0,0 +1,20 @@
+/** @file
+  Acts as the main entry point for the tests for the Dhcp6Dxe module.
+
+  Copyright (c) Microsoft Corporation
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+#include <gtest/gtest.h>
+
+////////////////////////////////////////////////////////////////////////////////
+// Run the tests
+////////////////////////////////////////////////////////////////////////////////
+int
+main (
+  int   argc,
+  char  *argv[]
+  )
+{
+  testing::InitGoogleTest (&argc, argv);
+  return RUN_ALL_TESTS ();
+}
diff --git a/NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6DxeGoogleTest.inf b/NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6DxeGoogleTest.inf
new file mode 100644
index 0000000000..8e9119a371
--- /dev/null
+++ b/NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6DxeGoogleTest.inf
@@ -0,0 +1,43 @@
+## @file
+# Unit test suite for the Dhcp6Dxe using Google Test
+#
+# Copyright (c) Microsoft Corporation.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+[Defines]
+  INF_VERSION         = 0x00010017
+  BASE_NAME           = Dhcp6DxeGoogleTest
+  FILE_GUID           = 1D2A4C65-38C8-4C2F-BB60-B5FA49625AA9
+  VERSION_STRING      = 1.0
+  MODULE_TYPE         = HOST_APPLICATION
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 AARCH64
+#
+[Sources]
+  Dhcp6DxeGoogleTest.cpp
+  Dhcp6IoGoogleTest.cpp
+  ../Dhcp6Io.c
+  ../Dhcp6Utility.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  UnitTestFrameworkPkg/UnitTestFrameworkPkg.dec
+  NetworkPkg/NetworkPkg.dec
+
+[LibraryClasses]
+  GoogleTestLib
+  DebugLib
+  NetLib
+  PcdLib
+
+[Protocols]
+  gEfiDhcp6ServiceBindingProtocolGuid
+
+[Pcd]
+  gEfiNetworkPkgTokenSpaceGuid.PcdDhcp6UidType
+
+[Guids]
+  gZeroGuid
diff --git a/NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6IoGoogleTest.cpp b/NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6IoGoogleTest.cpp
new file mode 100644
index 0000000000..7ee40e4af4
--- /dev/null
+++ b/NetworkPkg/Dhcp6Dxe/GoogleTest/Dhcp6IoGoogleTest.cpp
@@ -0,0 +1,478 @@
+/** @file
+  Tests for Dhcp6Io.c.
+
+  Copyright (c) Microsoft Corporation
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+#include <gtest/gtest.h>
+
+extern "C" {
+  #include <Uefi.h>
+  #include <Library/BaseLib.h>
+  #include <Library/DebugLib.h>
+  #include <Library/BaseMemoryLib.h>
+  #include "../Dhcp6Impl.h"
+  #include "../Dhcp6Utility.h"
+}
+
+////////////////////////////////////////////////////////////////////////
+// Defines
+////////////////////////////////////////////////////////////////////////
+
+#define DHCP6_PACKET_MAX_LEN  1500
+
+////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////
+// Symbol Definitions
+// These functions are not directly under test - but required to compile
+////////////////////////////////////////////////////////////////////////
+
+// This definition is used by this test but is also required to compile
+// by Dhcp6Io.c
+EFI_IPv6_ADDRESS  mAllDhcpRelayAndServersAddress = {
+  { 0xFF, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 2 }
+};
+
+EFI_STATUS
+EFIAPI
+UdpIoSendDatagram (
+  IN  UDP_IO           *UdpIo,
+  IN  NET_BUF          *Packet,
+  IN  UDP_END_POINT    *EndPoint OPTIONAL,
+  IN  EFI_IP_ADDRESS   *Gateway  OPTIONAL,
+  IN  UDP_IO_CALLBACK  CallBack,
+  IN  VOID             *Context
+  )
+{
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+UdpIoRecvDatagram (
+  IN  UDP_IO           *UdpIo,
+  IN  UDP_IO_CALLBACK  CallBack,
+  IN  VOID             *Context,
+  IN  UINT32           HeadLen
+  )
+{
+  return EFI_SUCCESS;
+}
+
+////////////////////////////////////////////////////////////////////////
+// Dhcp6AppendOptionTest Tests
+////////////////////////////////////////////////////////////////////////
+
+class Dhcp6AppendOptionTest : public ::testing::Test {
+public:
+  UINT8 *Buffer = NULL;
+  EFI_DHCP6_PACKET *Packet;
+
+protected:
+  // Add any setup code if needed
+  virtual void
+  SetUp (
+    )
+  {
+    // Initialize any resources or variables
+    Buffer = (UINT8 *)AllocateZeroPool (DHCP6_PACKET_MAX_LEN);
+    ASSERT_NE (Buffer, (UINT8 *)NULL);
+
+    Packet       = (EFI_DHCP6_PACKET *)Buffer;
+    Packet->Size = DHCP6_PACKET_MAX_LEN;
+  }
+
+  // Add any cleanup code if needed
+  virtual void
+  TearDown (
+    )
+  {
+    // Clean up any resources or variables
+    if (Buffer != NULL) {
+      FreePool (Buffer);
+    }
+  }
+};
+
+// Test Description:
+// Attempt to append an option to a packet that is too small by a duid that is too large
+TEST_F (Dhcp6AppendOptionTest, InvalidDataExpectBufferTooSmall) {
+  UINT8           *Cursor;
+  EFI_DHCP6_DUID  *UntrustedDuid;
+  EFI_STATUS      Status;
+
+  UntrustedDuid = (EFI_DHCP6_DUID *)AllocateZeroPool (sizeof (EFI_DHCP6_DUID));
+  ASSERT_NE (UntrustedDuid, (EFI_DHCP6_DUID *)NULL);
+
+  UntrustedDuid->Length = NTOHS (0xFFFF);
+
+  Cursor = Dhcp6AppendOptionTest::Packet->Dhcp6.Option;
+
+  Status = Dhcp6AppendOption (
+             Dhcp6AppendOptionTest::Packet,
+             &Cursor,
+             HTONS (Dhcp6OptServerId),
+             UntrustedDuid->Length,
+             UntrustedDuid->Duid
+             );
+
+  ASSERT_EQ (Status, EFI_BUFFER_TOO_SMALL);
+}
+
+// Test Description:
+// Attempt to append an option to a packet that is large enough
+TEST_F (Dhcp6AppendOptionTest, ValidDataExpectSuccess) {
+  UINT8           *Cursor;
+  EFI_DHCP6_DUID  *UntrustedDuid;
+  EFI_STATUS      Status;
+  UINTN           OriginalLength;
+
+  UINT8  Duid[6] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 };
+
+  Packet->Length = sizeof (EFI_DHCP6_HEADER);
+  OriginalLength = Packet->Length;
+
+  UntrustedDuid = (EFI_DHCP6_DUID *)AllocateZeroPool (sizeof (EFI_DHCP6_DUID));
+  ASSERT_NE (UntrustedDuid, (EFI_DHCP6_DUID *)NULL);
+
+  UntrustedDuid->Length = NTOHS (sizeof (Duid));
+  CopyMem (UntrustedDuid->Duid, Duid, sizeof (Duid));
+
+  Cursor = Dhcp6AppendOptionTest::Packet->Dhcp6.Option;
+
+  Status = Dhcp6AppendOption (
+             Dhcp6AppendOptionTest::Packet,
+             &Cursor,
+             HTONS (Dhcp6OptServerId),
+             UntrustedDuid->Length,
+             UntrustedDuid->Duid
+             );
+
+  ASSERT_EQ (Status, EFI_SUCCESS);
+
+  // verify that the pointer to cursor moved by the expected amount
+  ASSERT_EQ (Cursor, (UINT8 *)Dhcp6AppendOptionTest::Packet->Dhcp6.Option + sizeof (Duid) + 4);
+
+  // verify that the length of the packet is now the expected amount
+  ASSERT_EQ (Dhcp6AppendOptionTest::Packet->Length, OriginalLength + sizeof (Duid) + 4);
+}
+
+////////////////////////////////////////////////////////////////////////
+// Dhcp6AppendETOption Tests
+////////////////////////////////////////////////////////////////////////
+
+class Dhcp6AppendETOptionTest : public ::testing::Test {
+public:
+  UINT8 *Buffer = NULL;
+  EFI_DHCP6_PACKET *Packet;
+
+protected:
+  // Add any setup code if needed
+  virtual void
+  SetUp (
+    )
+  {
+    // Initialize any resources or variables
+    Buffer = (UINT8 *)AllocateZeroPool (DHCP6_PACKET_MAX_LEN);
+    ASSERT_NE (Buffer, (UINT8 *)NULL);
+
+    Packet         = (EFI_DHCP6_PACKET *)Buffer;
+    Packet->Size   = DHCP6_PACKET_MAX_LEN;
+    Packet->Length = sizeof (EFI_DHCP6_HEADER);
+  }
+
+  // Add any cleanup code if needed
+  virtual void
+  TearDown (
+    )
+  {
+    // Clean up any resources or variables
+    if (Buffer != NULL) {
+      FreePool (Buffer);
+    }
+  }
+};
+
+// Test Description:
+// Attempt to append an option to a packet that is too small by a duid that is too large
+TEST_F (Dhcp6AppendETOptionTest, InvalidDataExpectBufferTooSmall) {
+  UINT8           *Cursor;
+  EFI_STATUS      Status;
+  DHCP6_INSTANCE  Instance;
+  UINT16          ElapsedTimeVal;
+  UINT16          *ElapsedTime;
+
+  Cursor      = Dhcp6AppendETOptionTest::Packet->Dhcp6.Option;
+  ElapsedTime = &ElapsedTimeVal;
+
+  Packet->Length = Packet->Size - 2;
+
+  Status = Dhcp6AppendETOption (
+             Dhcp6AppendETOptionTest::Packet,
+             &Cursor,
+             &Instance, // Instance is not used in this function
+             &ElapsedTime
+             );
+
+  // verify that we error out because the packet is too small for the option header
+  ASSERT_EQ (Status, EFI_BUFFER_TOO_SMALL);
+
+  // reset the length
+  Packet->Length = sizeof (EFI_DHCP6_HEADER);
+}
+
+// Test Description:
+// Attempt to append an option to a packet that is large enough
+TEST_F (Dhcp6AppendETOptionTest, ValidDataExpectSuccess) {
+  UINT8           *Cursor;
+  EFI_STATUS      Status;
+  DHCP6_INSTANCE  Instance;
+  UINT16          ElapsedTimeVal;
+  UINT16          *ElapsedTime;
+  UINTN           ExpectedSize;
+  UINTN           OriginalLength;
+
+  Cursor         = Dhcp6AppendETOptionTest::Packet->Dhcp6.Option;
+  ElapsedTime    = &ElapsedTimeVal;
+  ExpectedSize   = 6;
+  OriginalLength = Packet->Length;
+
+  Status = Dhcp6AppendETOption (
+             Dhcp6AppendETOptionTest::Packet,
+             &Cursor,
+             &Instance, // Instance is not used in this function
+             &ElapsedTime
+             );
+
+  // verify that the status is EFI_SUCCESS
+  ASSERT_EQ (Status, EFI_SUCCESS);
+
+  // verify that the pointer to cursor moved by the expected amount
+  ASSERT_EQ (Cursor, (UINT8 *)Dhcp6AppendETOptionTest::Packet->Dhcp6.Option + ExpectedSize);
+
+  // verify that the length of the packet is now the expected amount
+  ASSERT_EQ (Dhcp6AppendETOptionTest::Packet->Length, OriginalLength + ExpectedSize);
+}
+
+////////////////////////////////////////////////////////////////////////
+// Dhcp6AppendIaOption Tests
+////////////////////////////////////////////////////////////////////////
+
+class Dhcp6AppendIaOptionTest : public ::testing::Test {
+public:
+  UINT8 *Buffer = NULL;
+  EFI_DHCP6_PACKET *Packet;
+  EFI_DHCP6_IA *Ia;
+
+protected:
+  // Add any setup code if needed
+  virtual void
+  SetUp (
+    )
+  {
+    // Initialize any resources or variables
+    Buffer = (UINT8 *)AllocateZeroPool (DHCP6_PACKET_MAX_LEN);
+    ASSERT_NE (Buffer, (UINT8 *)NULL);
+
+    Packet       = (EFI_DHCP6_PACKET *)Buffer;
+    Packet->Size = DHCP6_PACKET_MAX_LEN;
+
+    Ia = (EFI_DHCP6_IA *)AllocateZeroPool (sizeof (EFI_DHCP6_IA) + sizeof (EFI_DHCP6_IA_ADDRESS) * 2);
+    ASSERT_NE (Ia, (EFI_DHCP6_IA *)NULL);
+
+    CopyMem (Ia->IaAddress, mAllDhcpRelayAndServersAddress.Addr, sizeof (EFI_IPv6_ADDRESS));
+    CopyMem (Ia->IaAddress + 1, mAllDhcpRelayAndServersAddress.Addr, sizeof (EFI_IPv6_ADDRESS));
+
+    Ia->IaAddressCount = 2;
+  }
+
+  // Add any cleanup code if needed
+  virtual void
+  TearDown (
+    )
+  {
+    // Clean up any resources or variables
+    if (Buffer != NULL) {
+      FreePool (Buffer);
+    }
+
+    if (Ia != NULL) {
+      FreePool (Ia);
+    }
+  }
+};
+
+// Test Description:
+// Attempt to append an option to a packet that doesn't have enough space
+// for the option header
+TEST_F (Dhcp6AppendIaOptionTest, IaNaInvalidDataExpectBufferTooSmall) {
+  UINT8       *Cursor;
+  EFI_STATUS  Status;
+
+  Packet->Length = Packet->Size - 2;
+
+  Ia->Descriptor.Type = Dhcp6OptIana;
+  Ia->Descriptor.IaId = 0x12345678;
+
+  Cursor = Dhcp6AppendIaOptionTest::Packet->Dhcp6.Option;
+
+  Status = Dhcp6AppendIaOption (
+             Dhcp6AppendIaOptionTest::Packet,
+             &Cursor,
+             Ia,
+             0x12345678,
+             0x11111111,
+             Dhcp6OptIana
+             );
+
+  // verify that we error out because the packet is too small for the option header
+  ASSERT_EQ (Status, EFI_BUFFER_TOO_SMALL);
+
+  // reset the length
+  Packet->Length = sizeof (EFI_DHCP6_HEADER);
+}
+
+// Test Description:
+// Attempt to append an option to a packet that doesn't have enough space
+// for the option header
+TEST_F (Dhcp6AppendIaOptionTest, IaTaInvalidDataExpectBufferTooSmall) {
+  UINT8       *Cursor;
+  EFI_STATUS  Status;
+
+  // Use up nearly all the space in the packet
+  Packet->Length = Packet->Size - 2;
+
+  Ia->Descriptor.Type = Dhcp6OptIata;
+  Ia->Descriptor.IaId = 0x12345678;
+
+  Cursor = Dhcp6AppendIaOptionTest::Packet->Dhcp6.Option;
+
+  Status = Dhcp6AppendIaOption (
+             Dhcp6AppendIaOptionTest::Packet,
+             &Cursor,
+             Ia,
+             0,
+             0,
+             Dhcp6OptIata
+             );
+
+  // verify that we error out because the packet is too small for the option header
+  ASSERT_EQ (Status, EFI_BUFFER_TOO_SMALL);
+
+  // reset the length
+  Packet->Length = sizeof (EFI_DHCP6_HEADER);
+}
+
+TEST_F (Dhcp6AppendIaOptionTest, IaNaValidDataExpectSuccess) {
+  UINT8       *Cursor;
+  EFI_STATUS  Status;
+  UINTN       ExpectedSize;
+  UINTN       OriginalLength;
+
+  //
+  // 2 bytes for the option header type
+  //
+  ExpectedSize = 2;
+  //
+  // 2 bytes for the option header length
+  //
+  ExpectedSize += 2;
+  //
+  // 4 bytes for the IAID
+  //
+  ExpectedSize += 4;
+  //
+  // + 4 bytes for the T1
+  //
+  ExpectedSize += 4;
+  //
+  // + 4 bytes for the T2
+  //
+  ExpectedSize += 4;
+  //
+  // + (4 + sizeof (EFI_DHCP6_IA_ADDRESS)) * 2;
+  //   + 2 bytes for the option header type
+  //   + 2 bytes for the option header length
+  //   + sizeof (EFI_DHCP6_IA_ADDRESS) for the IA Address
+  //
+  ExpectedSize += (4 + sizeof (EFI_DHCP6_IA_ADDRESS)) * 2;
+
+  Cursor = Dhcp6AppendIaOptionTest::Packet->Dhcp6.Option;
+
+  Packet->Length = sizeof (EFI_DHCP6_HEADER);
+  OriginalLength = Packet->Length;
+
+  Ia->Descriptor.Type = Dhcp6OptIana;
+  Ia->Descriptor.IaId = 0x12345678;
+
+  Status = Dhcp6AppendIaOption (
+             Dhcp6AppendIaOptionTest::Packet,
+             &Cursor,
+             Ia,
+             0x12345678,
+             0x12345678,
+             Dhcp6OptIana
+             );
+
+  // verify that the pointer to cursor moved by the expected amount
+  ASSERT_EQ (Cursor, (UINT8 *)Dhcp6AppendIaOptionTest::Packet->Dhcp6.Option + ExpectedSize);
+
+  // verify that the length of the packet is now the expected amount
+  ASSERT_EQ (Dhcp6AppendIaOptionTest::Packet->Length, OriginalLength + ExpectedSize);
+
+  // verify that the status is EFI_SUCCESS
+  ASSERT_EQ (Status, EFI_SUCCESS);
+}
+
+TEST_F (Dhcp6AppendIaOptionTest, IaTaValidDataExpectSuccess) {
+  UINT8       *Cursor;
+  EFI_STATUS  Status;
+  UINTN       ExpectedSize;
+  UINTN       OriginalLength;
+
+  //
+  // 2 bytes for the option header type
+  //
+  ExpectedSize = 2;
+  //
+  // 2 bytes for the option header length
+  //
+  ExpectedSize += 2;
+  //
+  // 4 bytes for the IAID
+  //
+  ExpectedSize += 4;
+  //
+  // + (4 + sizeof (EFI_DHCP6_IA_ADDRESS)) * 2;
+  //   + 2 bytes for the option header type
+  //   + 2 bytes for the option header length
+  //   + sizeof (EFI_DHCP6_IA_ADDRESS) for the IA Address
+  //
+  ExpectedSize += (4 + sizeof (EFI_DHCP6_IA_ADDRESS)) * 2;
+
+  Cursor = Dhcp6AppendIaOptionTest::Packet->Dhcp6.Option;
+
+  Packet->Length = sizeof (EFI_DHCP6_HEADER);
+  OriginalLength = Packet->Length;
+
+  Ia->Descriptor.Type = Dhcp6OptIata;
+  Ia->Descriptor.IaId = 0x12345678;
+
+  Status = Dhcp6AppendIaOption (
+             Dhcp6AppendIaOptionTest::Packet,
+             &Cursor,
+             Ia,
+             0,
+             0,
+             Dhcp6OptIata
+             );
+
+  // verify that the pointer to cursor moved by the expected amount
+  ASSERT_EQ (Cursor, (UINT8 *)Dhcp6AppendIaOptionTest::Packet->Dhcp6.Option + ExpectedSize);
+
+  // verify that the length of the packet is now the expected amount
+  ASSERT_EQ (Dhcp6AppendIaOptionTest::Packet->Length, OriginalLength + ExpectedSize);
+
+  // verify that the status is EFI_SUCCESS
+  ASSERT_EQ (Status, EFI_SUCCESS);
+}
-- 
2.40.0

