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[nginx] HTTP/2: rejecting invalid stream identifiers with PROTOCOL_ERROR.

Sergey Kandaurov
September 02, 2020 04:26PM
details: https://hg.nginx.org/nginx/rev/da5e3f5b1673
branches:
changeset: 7703:da5e3f5b1673
user: Sergey Kandaurov <pluknet@nginx.com>
date: Wed Sep 02 23:13:36 2020 +0300
description:
HTTP/2: rejecting invalid stream identifiers with PROTOCOL_ERROR.

Prodded by Xu Yang.

diffstat:

src/http/v2/ngx_http_v2.c | 34 +++++++++++++++++++++++++++++++---
1 files changed, 31 insertions(+), 3 deletions(-)

diffs (72 lines):

diff -r 7015f26aef90 -r da5e3f5b1673 src/http/v2/ngx_http_v2.c
--- a/src/http/v2/ngx_http_v2.c Wed Jul 29 13:28:04 2020 +0300
+++ b/src/http/v2/ngx_http_v2.c Wed Sep 02 23:13:36 2020 +0300
@@ -953,6 +953,13 @@ ngx_http_v2_state_data(ngx_http_v2_conne
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
"http2 DATA frame");

+ if (h2c->state.sid == 0) {
+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
+ "client sent DATA frame with incorrect identifier");
+
+ return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_PROTOCOL_ERROR);
+ }
+
if (size > h2c->recv_window) {
ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
"client violated connection flow control: "
@@ -2095,6 +2102,16 @@ static u_char *
ngx_http_v2_state_settings(ngx_http_v2_connection_t *h2c, u_char *pos,
u_char *end)
{
+ ngx_log_debug0(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
+ "http2 SETTINGS frame");
+
+ if (h2c->state.sid) {
+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
+ "client sent SETTINGS frame with incorrect identifier");
+
+ return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_PROTOCOL_ERROR);
+ }
+
if (h2c->state.flags == NGX_HTTP_V2_ACK_FLAG) {

if (h2c->state.length != 0) {
@@ -2118,9 +2135,6 @@ ngx_http_v2_state_settings(ngx_http_v2_c
return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_SIZE_ERROR);
}

- ngx_log_debug0(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
- "http2 SETTINGS frame");
-
return ngx_http_v2_state_settings_params(h2c, pos, end);
}

@@ -2269,6 +2283,13 @@ ngx_http_v2_state_ping(ngx_http_v2_conne
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
"http2 PING frame");

+ if (h2c->state.sid) {
+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
+ "client sent PING frame with incorrect identifier");
+
+ return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_PROTOCOL_ERROR);
+ }
+
if (h2c->state.flags & NGX_HTTP_V2_ACK_FLAG) {
return ngx_http_v2_state_skip(h2c, pos, end);
}
@@ -2310,6 +2331,13 @@ ngx_http_v2_state_goaway(ngx_http_v2_con
return ngx_http_v2_state_save(h2c, pos, end, ngx_http_v2_state_goaway);
}

+ if (h2c->state.sid) {
+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
+ "client sent GOAWAY frame with incorrect identifier");
+
+ return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_PROTOCOL_ERROR);
+ }
+
#if (NGX_DEBUG)
h2c->state.length -= NGX_HTTP_V2_GOAWAY_SIZE;

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Subject Author Views Posted

[nginx] HTTP/2: rejecting invalid stream identifiers with PROTOCOL_ERROR.

Sergey Kandaurov 99 September 02, 2020 04:26PM



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