http: stricter Transfer-Encoding and header separator parsing

Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>
PR-URL: nodejs-private/node-private#315
CVE-ID: CVE-2022-32215,CVE-2022-32214,CVE-2022-32212

Backport-PR-URL: nodejs-private/node-private#326

deps/llhttp/CMakeLists.txt

@@ -1,53 +1,115 @@
 cmake_minimum_required(VERSION 3.5.1)
 cmake_policy(SET CMP0069 NEW)
 
-project(llhttp C)
+project(llhttp VERSION 6.0.5)
+include(GNUInstallDirs)
 
 set(CMAKE_C_STANDARD 99)
 
+# By default build in relwithdebinfo type, supports both lowercase and uppercase
+if(NOT CMAKE_CONFIGURATION_TYPES)
+  set(allowableBuileTypes DEBUG RELEASE RELWITHDEBINFO MINSIZEREL)
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "${allowableBuileTypes}")
+  if(NOT CMAKE_BUILD_TYPE)
+  set(CMAKE_BUILD_TYPE RELWITHDEBINFO CACHE STRING "" FORCE)
+  else()
+    string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE)
+    if(NOT CMAKE_BUILD_TYPE IN_LIST allowableBuileTypes)
+      message(FATEL_ERROR "Invalid build type: ${CMAKE_BUILD_TYPE}")
+    endif()
+  endif()
+endif()
+
 #
 # Options
 #
 # Generic option
-option(BUILD_SHARED_LIBS "Build shared libraries (.dll/.so) instead of static ones (.lib/.a)" OFF)
+option(BUILD_SHARED_LIBS "Build shared libraries (.dll/.so)" ON)
+option(BUILD_STATIC_LIBS "Build static libraries (.lib/.a)" OFF)
 
 # Source code
 set(LLHTTP_SOURCES
-  src/llhttp.c
-  src/http.c
-  src/api.c
+  ${CMAKE_CURRENT_SOURCE_DIR}/src/llhttp.c
+  ${CMAKE_CURRENT_SOURCE_DIR}/src/http.c
+  ${CMAKE_CURRENT_SOURCE_DIR}/src/api.c
 )
 
 set(LLHTTP_HEADERS
-  include/llhttp.h
+  ${CMAKE_CURRENT_SOURCE_DIR}/include/llhttp.h
 )
 
-add_library(llhttp)
-add_library(llhttp::llhttp ALIAS llhttp)
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/libllhttp.pc.in
+  ${CMAKE_CURRENT_SOURCE_DIR}/libllhttp.pc
+  @ONLY
+)
 
-target_sources(llhttp PRIVATE ${LLHTTP_SOURCES} ${LLHTTP_HEADERS})
+function(config_library target)
+  target_sources(${target} PRIVATE ${LLHTTP_SOURCES} ${LLHTTP_HEADERS})
 
-# On windows with Visual Studio, add a debug postfix so that release
-# and debug libraries can coexist.
-if(MSVC)
-  set(CMAKE_DEBUG_POSTFIX "d")
-endif()
+  target_include_directories(${target} PRIVATE
+      ${CMAKE_CURRENT_SOURCE_DIR}/include
+  )
 
-target_include_directories(llhttp PUBLIC
-  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
-  $<INSTALL_INTERFACE:include>
-)
+  set_target_properties(${target} PROPERTIES
+    OUTPUT_NAME llhttp
+    VERSION ${PROJECT_VERSION}
+    SOVERSION ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
+    PUBLIC_HEADER ${LLHTTP_HEADERS}
+  )
 
-set_target_properties(llhttp PROPERTIES PUBLIC_HEADER ${LLHTTP_HEADERS})
+  install(TARGETS ${target}
+    EXPORT llhttp
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+  )
 
-install(TARGETS llhttp
-        EXPORT llhttp
-        ARCHIVE DESTINATION lib
-        PUBLIC_HEADER DESTINATION include/
-)
+  install(FILES
+    ${CMAKE_CURRENT_SOURCE_DIR}/libllhttp.pc
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+  )
 
-# This is required to work with FetchContent
-install(EXPORT llhttp
+  # This is required to work with FetchContent
+  install(EXPORT llhttp
         FILE llhttp-config.cmake
         NAMESPACE llhttp::
-        DESTINATION lib/cmake/llhttp)
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/llhttp)
+endfunction(config_library target)
+
+if(BUILD_SHARED_LIBS)
+  add_library(llhttp_shared SHARED
+      ${llhttp_src}
+  )
+  add_library(llhttp::llhttp ALIAS llhttp_shared)
+  config_library(llhttp_shared)
+endif()
+
+if(BUILD_STATIC_LIBS)
+  add_library(llhttp_static STATIC
+      ${llhttp_src}
+  )
+  if(BUILD_SHARED_LIBS)
+    add_library(llhttp::llhttp ALIAS llhttp_shared)
+  else()
+    add_library(llhttp::llhttp ALIAS llhttp_static)
+  endif()
+  config_library(llhttp_static)
+endif()
+
+# On windows with Visual Studio, add a debug postfix so that release
+# and debug libraries can coexist.
+if(MSVC)
+  set(CMAKE_DEBUG_POSTFIX "d")
+endif()
+
+# Print project configure summary
+message(STATUS "")
+message(STATUS "")
+message(STATUS "Project configure summary:")
+message(STATUS "")
+message(STATUS "  CMake build type .................: ${CMAKE_BUILD_TYPE}")
+message(STATUS "  Install prefix ...................: ${CMAKE_INSTALL_PREFIX}")
+message(STATUS "  Build shared library .............: ${BUILD_SHARED_LIBS}")
+message(STATUS "  Build static library .............: ${BUILD_STATIC_LIBS}")
+message(STATUS "")

deps/llhttp/README.md

@@ -90,7 +90,16 @@ if (err == HPE_OK) {
           parser.reason);
 }
 ```
-For more information on API usage, please refer to [src/native/api.h](https://github.com/nodejs/llhttp/blob/master/src/native/api.h).
+For more information on API usage, please refer to [src/native/api.h](https://github.com/nodejs/llhttp/blob/main/src/native/api.h).
+
+## Build Instructions
+
+Make sure you have [Node.js](https://nodejs.org/), npm and npx installed. Then under project directory run:
+
+```sh
+npm install
+make
+```
 
 ---
 
@@ -99,20 +108,41 @@ For more information on API usage, please refer to [src/native/api.h](https://gi
 * Python: [pallas/pyllhttp][8]
 * Ruby: [metabahn/llhttp][9]
 
-
 ### Using with CMake
 
 If you want to use this library in a CMake project you can use the snippet below.
 
 ```
 FetchContent_Declare(llhttp
-  URL "https://github.com/nodejs/llhttp/releases/download/v6.0.4/llhttp-release-v6.0.4.tar.gz")  # Using version 6.0.4
+  URL "https://github.com/nodejs/llhttp/releases/download/v6.0.5/llhttp-release-v6.0.5.tar.gz")  # Using version 6.0.5
 
 FetchContent_MakeAvailable(llhttp)
 
 target_link_libraries(${EXAMPLE_PROJECT_NAME} ${PROJECT_LIBRARIES} llhttp ${PROJECT_NAME})
 ```
 
+## Building on Windows
+
+### Installation
+
+* `choco install git`
+* `choco install node`
+* `choco install llvm` (or install the `C++ Clang tools for Windows` optional package from the Visual Studio 2019 installer)
+* `choco install make` (or if you have MinGW, it comes bundled)
+
+1. Ensure that `Clang` and `make` are in your system path.
+2. Using Git Bash, clone the repo to your preferred location.
+3. Cd into the cloned directory and run `npm install`
+5. Run `make`
+6. Your `repo/build` directory should now have `libllhttp.a` and `libllhttp.so` static and dynamic libraries.
+7. When building your executable, you can link to these libraries. Make sure to set the build folder as an include path when building so you can reference the declarations in `repo/build/llhttp.h`.
+
+### A simple example on linking with the library:
+
+Assuming you have an executable `main.cpp` in your current working directory, you would run: `clang++ -Os -g3 -Wall -Wextra -Wno-unused-parameter -I/path/to/llhttp/build main.cpp /path/to/llhttp/build/libllhttp.a -o main.exe`.
+
+If you are getting `unresolved external symbol` linker errors you are likely attempting to build `llhttp.c` without linking it with object files from `api.c` and `http.c`.
+
 #### LICENSE
 
 This software is licensed under the MIT License.

deps/llhttp/include/llhttp.h

@@ -3,7 +3,7 @@
 
 #define LLHTTP_VERSION_MAJOR 6
 #define LLHTTP_VERSION_MINOR 0
-#define LLHTTP_VERSION_PATCH 4
+#define LLHTTP_VERSION_PATCH 7
 
 #ifndef LLHTTP_STRICT_MODE
 # define LLHTTP_STRICT_MODE 0
@@ -59,6 +59,7 @@ enum llhttp_errno {
   HPE_OK = 0,
   HPE_INTERNAL = 1,
   HPE_STRICT = 2,
+  HPE_CR_EXPECTED = 25,
   HPE_LF_EXPECTED = 3,
   HPE_UNEXPECTED_CONTENT_LENGTH = 4,
   HPE_CLOSED_CONNECTION = 5,
@@ -100,7 +101,8 @@ typedef enum llhttp_flags llhttp_flags_t;
 enum llhttp_lenient_flags {
   LENIENT_HEADERS = 0x1,
   LENIENT_CHUNKED_LENGTH = 0x2,
-  LENIENT_KEEP_ALIVE = 0x4
+  LENIENT_KEEP_ALIVE = 0x4,
+  LENIENT_TRANSFER_ENCODING = 0x8
 };
 typedef enum llhttp_lenient_flags llhttp_lenient_flags_t;
 
@@ -172,6 +174,7 @@ typedef enum llhttp_method llhttp_method_t;
   XX(0, OK, OK) \
   XX(1, INTERNAL, INTERNAL) \
   XX(2, STRICT, STRICT) \
+  XX(25, CR_EXPECTED, CR_EXPECTED) \
   XX(3, LF_EXPECTED, LF_EXPECTED) \
   XX(4, UNEXPECTED_CONTENT_LENGTH, UNEXPECTED_CONTENT_LENGTH) \
   XX(5, CLOSED_CONNECTION, CLOSED_CONNECTION) \
@@ -374,8 +377,6 @@ LLHTTP_EXPORT
 void llhttp_init(llhttp_t* parser, llhttp_type_t type,
                  const llhttp_settings_t* settings);
 
-#if defined(__wasm__)
-
 LLHTTP_EXPORT
 llhttp_t* llhttp_alloc(llhttp_type_t type);
 
@@ -400,8 +401,6 @@ int llhttp_get_status_code(llhttp_t* parser);
 LLHTTP_EXPORT
 uint8_t llhttp_get_upgrade(llhttp_t* parser);
 
-#endif  // defined(__wasm__)
-
 /* Reset an already initialized parser back to the start state, preserving the
  * existing parser type, callback settings, user data, and lenient flags.
  */
@@ -556,6 +555,19 @@ void llhttp_set_lenient_chunked_length(llhttp_t* parser, int enabled);
  */
 void llhttp_set_lenient_keep_alive(llhttp_t* parser, int enabled);
 
+/* Enables/disables lenient handling of `Transfer-Encoding` header.
+ *
+ * Normally `llhttp` would error when a `Transfer-Encoding` has `chunked` value
+ * and another value after it (either in a single header or in multiple
+ * headers whose value are internally joined using `, `).
+ * This is mandated by the spec to reliably determine request body size and thus
+ * avoid request smuggling.
+ * With this flag the extra value will be parsed normally.
+ *
+ * **(USE AT YOUR OWN RISK)**
+ */
+void llhttp_set_lenient_transfer_encoding(llhttp_t* parser, int enabled);
+
 #ifdef __cplusplus
 }  /* extern "C" */
 #endif

deps/llhttp/libllhttp.pc.in

@@ -0,0 +1,10 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=@CMAKE_INSTALL_PREFIX@
+libdir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_LIBDIR@
+includedir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@
+
+Name: libllhttp
+Description: Node.js llhttp Library
+Version: @PROJECT_VERSION@
+Libs: -L${libdir} -lllhttp
+Cflags: -I${includedir}

deps/llhttp/src/api.c

@@ -253,6 +253,14 @@ void llhttp_set_lenient_keep_alive(llhttp_t* parser, int enabled) {
   }
 }
 
+void llhttp_set_lenient_transfer_encoding(llhttp_t* parser, int enabled) {
+  if (enabled) {
+    parser->lenient_flags |= LENIENT_TRANSFER_ENCODING;
+  } else {
+    parser->lenient_flags &= ~LENIENT_TRANSFER_ENCODING;
+  }
+}
+
 /* Callbacks */
 
 

deps/llhttp/src/http.c

@@ -52,7 +52,8 @@ int llhttp__after_headers_complete(llhttp_t* parser, const char* p,
     return 2;
   } else if (parser->flags & F_TRANSFER_ENCODING) {
     if (parser->type == HTTP_REQUEST &&
-        (parser->lenient_flags & LENIENT_CHUNKED_LENGTH) == 0) {
+        (parser->lenient_flags & LENIENT_CHUNKED_LENGTH) == 0 &&
+        (parser->lenient_flags & LENIENT_TRANSFER_ENCODING) == 0) {
       /* RFC 7230 3.3.3 */
 
       /* If a Transfer-Encoding header field