nghttp2: Add fix for CVE-2020-11080

Added below two patches to fix CVE-2020-11080:

1. CVE-2020-11080-1.patch
2. CVE-2020-11080-2.patch

Signed-off-by: Rahul Taya <Rahul.Taya@kpit.com>
[Refreshed patches to apply]
Signed-off-by: Armin Kuster <akuster808@gmail.com>

3 files changed, 341 insertions, 0 deletions

diff --git a/meta-networking/recipes-support/nghttp2/nghttp2/CVE-2020-11080-1.patch b/meta-networking/recipes-support/nghttp2/nghttp2/CVE-2020-11080-1.patch
new file mode 100644
index 000000000..ca181bb4b
--- /dev/null
+++ b/meta-networking/recipes-support/nghttp2/nghttp2/CVE-2020-11080-1.patch
@@ -0,0 +1,31 @@
+From f8da73bd042f810f34d19f9eae02b46d870af394 Mon Sep 17 00:00:00 2001
+From: James M Snell <jasnell@gmail.com>
+Date: Sun, 19 Apr 2020 09:12:24 -0700
+Subject: [PATCH] Earlier check for settings flood
+
+CVE: CVE-2020-11080
+Upstream-Status: Backport [https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394.patch]
+Comment: No hunk refreshed
+Affects-version: < v1.41.0
+Signed-off-by: Rahul Taya <Rahul.Taya@kpit.com>
+---
+ lib/nghttp2_session.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+Index: nghttp2-1.40.0/lib/nghttp2_session.c
+===================================================================
+--- nghttp2-1.40.0.orig/lib/nghttp2_session.c
++++ nghttp2-1.40.0/lib/nghttp2_session.c
+@@ -5678,6 +5678,12 @@ ssize_t nghttp2_session_mem_recv(nghttp2
+           break;
+         }
+ 
++        /* Check the settings flood counter early to be safe */
++        if (session->obq_flood_counter_ >= session->max_outbound_ack &&
++            !(iframe->frame.hd.flags & NGHTTP2_FLAG_ACK)) {
++          return NGHTTP2_ERR_FLOODED;
++        }
++
+         iframe->state = NGHTTP2_IB_READ_SETTINGS;
+ 
+         if (iframe->payloadleft) {
diff --git a/meta-networking/recipes-support/nghttp2/nghttp2/CVE-2020-11080-2.patch b/meta-networking/recipes-support/nghttp2/nghttp2/CVE-2020-11080-2.patch
new file mode 100644
index 000000000..d3c57e9a8
--- /dev/null
+++ b/meta-networking/recipes-support/nghttp2/nghttp2/CVE-2020-11080-2.patch
@@ -0,0 +1,308 @@
+From 336a98feb0d56b9ac54e12736b18785c27f75090 Mon Sep 17 00:00:00 2001
+From: James M Snell <jasnell@gmail.com>
+Date: Fri, 17 Apr 2020 16:53:51 -0700
+Subject: [PATCH] Implement max settings option
+
+CVE: CVE-2020-11080
+Upstream-Status: Backport [https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090.patch]
+Comment: No hunks refreshed
+Affects-version: < v1.41.0
+Signed-off-by: Rahul Taya <Rahul.Taya@kpit.com>
+---
+ doc/CMakeLists.txt             |  1 +
+ doc/Makefile.am                |  1 +
+ lib/includes/nghttp2/nghttp2.h | 23 +++++++++++++
+ lib/nghttp2_helper.c           |  2 ++
+ lib/nghttp2_option.c           |  5 +++
+ lib/nghttp2_option.h           |  5 +++
+ lib/nghttp2_session.c          | 21 ++++++++++++
+ lib/nghttp2_session.h          |  2 ++
+ tests/main.c                   |  2 ++
+ tests/nghttp2_session_test.c   | 61 ++++++++++++++++++++++++++++++++++
+ tests/nghttp2_session_test.h   |  1 +
+ 11 files changed, 124 insertions(+)
+
+Index: nghttp2-1.40.0/doc/CMakeLists.txt
+===================================================================
+--- nghttp2-1.40.0.orig/doc/CMakeLists.txt
++++ nghttp2-1.40.0/doc/CMakeLists.txt
+@@ -42,6 +42,7 @@ set(APIDOCS
+   nghttp2_option_set_no_recv_client_magic.rst
+   nghttp2_option_set_peer_max_concurrent_streams.rst
+   nghttp2_option_set_user_recv_extension_type.rst
++  nghttp2_option_set_max_settings.rst
+   nghttp2_pack_settings_payload.rst
+   nghttp2_priority_spec_check_default.rst
+   nghttp2_priority_spec_default_init.rst
+Index: nghttp2-1.40.0/lib/includes/nghttp2/nghttp2.h
+===================================================================
+--- nghttp2-1.40.0.orig/lib/includes/nghttp2/nghttp2.h
++++ nghttp2-1.40.0/lib/includes/nghttp2/nghttp2.h
+@@ -229,6 +229,13 @@ typedef struct {
+ #define NGHTTP2_CLIENT_MAGIC_LEN 24
+ 
+ /**
++ * @macro
++ *
++ * The default max number of settings per SETTINGS frame
++ */
++#define NGHTTP2_DEFAULT_MAX_SETTINGS 32
++
++/**
+  * @enum
+  *
+  * Error codes used in this library.  The code range is [-999, -500],
+@@ -399,6 +406,11 @@ typedef enum {
+    */
+   NGHTTP2_ERR_SETTINGS_EXPECTED = -536,
+   /**
++   * When a local endpoint receives too many settings entries
++   * in a single SETTINGS frame.
++   */
++  NGHTTP2_ERR_TOO_MANY_SETTINGS = -537,
++  /**
+    * The errors < :enum:`NGHTTP2_ERR_FATAL` mean that the library is
+    * under unexpected condition and processing was terminated (e.g.,
+    * out of memory).  If application receives this error code, it must
+@@ -2661,6 +2673,17 @@ NGHTTP2_EXTERN void nghttp2_option_set_m
+ 
+ /**
+  * @function
++ *
++ * This function sets the maximum number of SETTINGS entries per
++ * SETTINGS frame that will be accepted. If more than those entries
++ * are received, the peer is considered to be misbehaving and session
++ * will be closed. The default value is 32.
++ */
++NGHTTP2_EXTERN void nghttp2_option_set_max_settings(nghttp2_option *option,
++                                                    size_t val);
++
++/**
++ * @function
+  *
+  * Initializes |*session_ptr| for client use.  The all members of
+  * |callbacks| are copied to |*session_ptr|.  Therefore |*session_ptr|
+Index: nghttp2-1.40.0/lib/nghttp2_helper.c
+===================================================================
+--- nghttp2-1.40.0.orig/lib/nghttp2_helper.c
++++ nghttp2-1.40.0/lib/nghttp2_helper.c
+@@ -334,6 +334,8 @@ const char *nghttp2_strerror(int error_c
+   case NGHTTP2_ERR_FLOODED:
+     return "Flooding was detected in this HTTP/2 session, and it must be "
+            "closed";
++  case NGHTTP2_ERR_TOO_MANY_SETTINGS:
++    return "SETTINGS frame contained more than the maximum allowed entries";
+   default:
+     return "Unknown error code";
+   }
+Index: nghttp2-1.40.0/lib/nghttp2_option.c
+===================================================================
+--- nghttp2-1.40.0.orig/lib/nghttp2_option.c
++++ nghttp2-1.40.0/lib/nghttp2_option.c
+@@ -121,3 +121,8 @@ void nghttp2_option_set_max_outbound_ack
+   option->opt_set_mask |= NGHTTP2_OPT_MAX_OUTBOUND_ACK;
+   option->max_outbound_ack = val;
+ }
++
++void nghttp2_option_set_max_settings(nghttp2_option *option, size_t val) {
++  option->opt_set_mask |= NGHTTP2_OPT_MAX_SETTINGS;
++  option->max_settings = val;
++}
+Index: nghttp2-1.40.0/lib/nghttp2_option.h
+===================================================================
+--- nghttp2-1.40.0.orig/lib/nghttp2_option.h
++++ nghttp2-1.40.0/lib/nghttp2_option.h
+@@ -67,6 +67,7 @@ typedef enum {
+   NGHTTP2_OPT_MAX_DEFLATE_DYNAMIC_TABLE_SIZE = 1 << 9,
+   NGHTTP2_OPT_NO_CLOSED_STREAMS = 1 << 10,
+   NGHTTP2_OPT_MAX_OUTBOUND_ACK = 1 << 11,
++  NGHTTP2_OPT_MAX_SETTINGS = 1 << 12,
+ } nghttp2_option_flag;
+ 
+ /**
+@@ -86,6 +87,10 @@ struct nghttp2_option {
+    */
+   size_t max_outbound_ack;
+   /**
++   * NGHTTP2_OPT_MAX_SETTINGS
++   */
++  size_t max_settings;
++  /**
+    * Bitwise OR of nghttp2_option_flag to determine that which fields
+    * are specified.
+    */
+Index: nghttp2-1.40.0/lib/nghttp2_session.c
+===================================================================
+--- nghttp2-1.40.0.orig/lib/nghttp2_session.c
++++ nghttp2-1.40.0/lib/nghttp2_session.c
+@@ -458,6 +458,7 @@ static int session_new(nghttp2_session *
+ 
+   (*session_ptr)->max_send_header_block_length = NGHTTP2_MAX_HEADERSLEN;
+   (*session_ptr)->max_outbound_ack = NGHTTP2_DEFAULT_MAX_OBQ_FLOOD_ITEM;
++  (*session_ptr)->max_settings = NGHTTP2_DEFAULT_MAX_SETTINGS;
+ 
+   if (option) {
+     if ((option->opt_set_mask & NGHTTP2_OPT_NO_AUTO_WINDOW_UPDATE) &&
+@@ -521,6 +522,11 @@ static int session_new(nghttp2_session *
+     if (option->opt_set_mask & NGHTTP2_OPT_MAX_OUTBOUND_ACK) {
+       (*session_ptr)->max_outbound_ack = option->max_outbound_ack;
+     }
++
++    if ((option->opt_set_mask & NGHTTP2_OPT_MAX_SETTINGS) &&
++        option->max_settings) {
++      (*session_ptr)->max_settings = option->max_settings;
++    }
+   }
+ 
+   rv = nghttp2_hd_deflate_init2(&(*session_ptr)->hd_deflater,
+@@ -5694,6 +5700,16 @@ ssize_t nghttp2_session_mem_recv(nghttp2
+           iframe->max_niv =
+               iframe->frame.hd.length / NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH + 1;
+ 
++          if (iframe->max_niv - 1 > session->max_settings) {
++            rv = nghttp2_session_terminate_session_with_reason(
++                session, NGHTTP2_ENHANCE_YOUR_CALM,
++                "SETTINGS: too many setting entries");
++            if (nghttp2_is_fatal(rv)) {
++              return rv;
++            }
++            return (ssize_t)inlen;
++          }
++
+           iframe->iv = nghttp2_mem_malloc(mem, sizeof(nghttp2_settings_entry) *
+                                                    iframe->max_niv);
+ 
+@@ -7460,6 +7476,11 @@ static int nghttp2_session_upgrade_inter
+   if (settings_payloadlen % NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH) {
+     return NGHTTP2_ERR_INVALID_ARGUMENT;
+   }
++  /* SETTINGS frame contains too many settings */
++  if (settings_payloadlen / NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH
++        > session->max_settings) {
++    return NGHTTP2_ERR_TOO_MANY_SETTINGS;
++  }
+   rv = nghttp2_frame_unpack_settings_payload2(&iv, &niv, settings_payload,
+                                               settings_payloadlen, mem);
+   if (rv != 0) {
+Index: nghttp2-1.40.0/lib/nghttp2_session.h
+===================================================================
+--- nghttp2-1.40.0.orig/lib/nghttp2_session.h
++++ nghttp2-1.40.0/lib/nghttp2_session.h
+@@ -267,6 +267,8 @@ struct nghttp2_session {
+   /* The maximum length of header block to send.  Calculated by the
+      same way as nghttp2_hd_deflate_bound() does. */
+   size_t max_send_header_block_length;
++  /* The maximum number of settings accepted per SETTINGS frame. */
++  size_t max_settings;
+   /* Next Stream ID. Made unsigned int to detect >= (1 << 31). */
+   uint32_t next_stream_id;
+   /* The last stream ID this session initiated.  For client session,
+Index: nghttp2-1.40.0/tests/main.c
+===================================================================
+--- nghttp2-1.40.0.orig/tests/main.c
++++ nghttp2-1.40.0/tests/main.c
+@@ -315,6 +315,8 @@ int main() {
+                    test_nghttp2_session_set_local_window_size) ||
+       !CU_add_test(pSuite, "session_cancel_from_before_frame_send",
+                    test_nghttp2_session_cancel_from_before_frame_send) ||
++      !CU_add_test(pSuite, "session_too_many_settings",
++                   test_nghttp2_session_too_many_settings) ||
+       !CU_add_test(pSuite, "session_removed_closed_stream",
+                    test_nghttp2_session_removed_closed_stream) ||
+       !CU_add_test(pSuite, "session_pause_data",
+Index: nghttp2-1.40.0/tests/nghttp2_session_test.c
+===================================================================
+--- nghttp2-1.40.0.orig/tests/nghttp2_session_test.c
++++ nghttp2-1.40.0/tests/nghttp2_session_test.c
+@@ -10558,6 +10558,67 @@ void test_nghttp2_session_cancel_from_be
+   nghttp2_session_del(session);
+ }
+ 
++void test_nghttp2_session_too_many_settings(void) {
++  nghttp2_session *session;
++  nghttp2_option *option;
++  nghttp2_session_callbacks callbacks;
++  nghttp2_frame frame;
++  nghttp2_bufs bufs;
++  nghttp2_buf *buf;
++  ssize_t rv;
++  my_user_data ud;
++  nghttp2_settings_entry iv[3];
++  nghttp2_mem *mem;
++  nghttp2_outbound_item *item;
++
++  mem = nghttp2_mem_default();
++  frame_pack_bufs_init(&bufs);
++
++  memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
++  callbacks.on_frame_recv_callback = on_frame_recv_callback;
++  callbacks.send_callback = null_send_callback;
++
++  nghttp2_option_new(&option);
++  nghttp2_option_set_max_settings(option, 1);
++
++  nghttp2_session_client_new2(&session, &callbacks, &ud, option);
++
++  CU_ASSERT(1 == session->max_settings);
++
++  nghttp2_option_del(option);
++
++  iv[0].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
++  iv[0].value = 3000;
++
++  iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
++  iv[1].value = 16384;
++
++  nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE, dup_iv(iv, 2),
++                              2);
++
++  rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
++
++  CU_ASSERT(0 == rv);
++  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
++
++  nghttp2_frame_settings_free(&frame.settings, mem);
++
++  buf = &bufs.head->buf;
++  assert(nghttp2_bufs_len(&bufs) == nghttp2_buf_len(buf));
++
++  ud.frame_recv_cb_called = 0;
++
++  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
++  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
++
++  item = nghttp2_session_get_next_ob_item(session);
++  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
++
++  nghttp2_bufs_reset(&bufs);
++  nghttp2_bufs_free(&bufs);
++  nghttp2_session_del(session);
++}
++
+ static void
+ prepare_session_removed_closed_stream(nghttp2_session *session,
+                                       nghttp2_hd_deflater *deflater) {
+Index: nghttp2-1.40.0/tests/nghttp2_session_test.h
+===================================================================
+--- nghttp2-1.40.0.orig/tests/nghttp2_session_test.h
++++ nghttp2-1.40.0/tests/nghttp2_session_test.h
+@@ -156,6 +156,7 @@ void test_nghttp2_session_repeated_prior
+ void test_nghttp2_session_repeated_priority_submission(void);
+ void test_nghttp2_session_set_local_window_size(void);
+ void test_nghttp2_session_cancel_from_before_frame_send(void);
++void test_nghttp2_session_too_many_settings(void);
+ void test_nghttp2_session_removed_closed_stream(void);
+ void test_nghttp2_session_pause_data(void);
+ void test_nghttp2_session_no_closed_streams(void);
+Index: nghttp2-1.40.0/doc/Makefile.am
+===================================================================
+--- nghttp2-1.40.0.orig/doc/Makefile.am
++++ nghttp2-1.40.0/doc/Makefile.am
+@@ -69,6 +69,7 @@ APIDOCS= \
+        nghttp2_option_set_peer_max_concurrent_streams.rst \
+        nghttp2_option_set_user_recv_extension_type.rst \
+        nghttp2_option_set_max_outbound_ack.rst \
++    nghttp2_option_set_max_settings.rst \
+        nghttp2_pack_settings_payload.rst \
+        nghttp2_priority_spec_check_default.rst \
+        nghttp2_priority_spec_default_init.rst \
diff --git a/meta-networking/recipes-support/nghttp2/nghttp2_1.40.0.bb b/meta-networking/recipes-support/nghttp2/nghttp2_1.40.0.bb
index 9ed8c5642..b497058ca 100644
--- a/meta-networking/recipes-support/nghttp2/nghttp2_1.40.0.bb
+++ b/meta-networking/recipes-support/nghttp2/nghttp2_1.40.0.bb
@@ -10,6 +10,8 @@ UPSTREAM_CHECK_URI = "https://github.com/nghttp2/nghttp2/releases"
 SRC_URI = "\
     https://github.com/nghttp2/nghttp2/releases/download/v${PV}/nghttp2-${PV}.tar.xz \
     file://0001-fetch-ocsp-response-use-python3.patch \
+    file://CVE-2020-11080-1.patch \
+    file://CVE-2020-11080-2.patch \
 "
 SRC_URI[md5sum] = "8d1a6b96760254e4dd142d7176e8fb7c"
 SRC_URI[sha256sum] = "09fc43d428ff237138733c737b29fb1a7e49d49de06d2edbed3bc4cdcee69073"