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SUSE:SLE-15-SP4:GA
nghttp2.19915
nghttp2-CVE-2020-11080.patch
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File nghttp2-CVE-2020-11080.patch of Package nghttp2.19915
Index: nghttp2-1.40.0/doc/CMakeLists.txt =================================================================== --- nghttp2-1.40.0.orig/doc/CMakeLists.txt 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/doc/CMakeLists.txt 2021-03-12 14:47:49.532888064 +0100 @@ -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/doc/Makefile.am =================================================================== --- nghttp2-1.40.0.orig/doc/Makefile.am 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/doc/Makefile.am 2021-03-12 14:47:49.532888064 +0100 @@ -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 \ Index: nghttp2-1.40.0/lib/includes/nghttp2/nghttp2.h =================================================================== --- nghttp2-1.40.0.orig/lib/includes/nghttp2/nghttp2.h 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/lib/includes/nghttp2/nghttp2.h 2021-03-12 14:47:49.532888064 +0100 @@ -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 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/lib/nghttp2_helper.c 2021-03-12 14:47:49.532888064 +0100 @@ -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 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/lib/nghttp2_option.c 2021-03-12 14:47:49.532888064 +0100 @@ -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 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/lib/nghttp2_option.h 2021-03-12 14:47:49.532888064 +0100 @@ -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 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/lib/nghttp2_session.c 2021-03-12 15:01:57.185475791 +0100 @@ -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, @@ -5678,6 +5684,12 @@ 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) { @@ -5688,6 +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); @@ -7454,6 +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 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/lib/nghttp2_session.h 2021-03-12 14:47:49.536888085 +0100 @@ -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 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/tests/main.c 2021-03-12 14:47:49.536888085 +0100 @@ -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 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/tests/nghttp2_session_test.c 2021-03-12 14:47:49.536888085 +0100 @@ -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 2019-11-15 15:19:29.000000000 +0100 +++ nghttp2-1.40.0/tests/nghttp2_session_test.h 2021-03-12 14:47:49.536888085 +0100 @@ -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);
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