71 lines
2.7 KiB
Diff
71 lines
2.7 KiB
Diff
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# HG changeset patch
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# User Maxim Dounin <mdounin@mdounin.ru>
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# Date 1696940019 -10800
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# Node ID cdda286c0f1b4b10f30d4eb6a63fefb9b8708ecc
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# Parent 3db945fda515014d220151046d02f3960bcfca0a
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HTTP/2: per-iteration stream handling limit.
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To ensure that attempts to flood servers with many streams are detected
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early, a limit of no more than 2 * max_concurrent_streams new streams per one
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event loop iteration was introduced. This limit is applied even if
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max_concurrent_streams is not yet reached - for example, if corresponding
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streams are handled synchronously or reset.
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Further, refused streams are now limited to maximum of max_concurrent_streams
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and 100, similarly to priority_limit initial value, providing some tolerance
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to clients trying to open several streams at the connection start, yet
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low tolerance to flooding attempts.
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diff -r 3db945fda515 -r cdda286c0f1b src/http/v2/ngx_http_v2.c
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--- a/src/http/v2/ngx_http_v2.c Fri Sep 22 19:23:57 2023 +0400
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+++ b/src/http/v2/ngx_http_v2.c Tue Oct 10 15:13:39 2023 +0300
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@@ -347,6 +347,7 @@
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ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http2 read handler");
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h2c->blocked = 1;
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+ h2c->new_streams = 0;
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if (c->close) {
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c->close = 0;
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@@ -1284,6 +1285,14 @@
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goto rst_stream;
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}
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+ if (h2c->new_streams++ >= 2 * h2scf->concurrent_streams) {
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+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
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+ "client sent too many streams at once");
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+
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+ status = NGX_HTTP_V2_REFUSED_STREAM;
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+ goto rst_stream;
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+ }
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+
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if (!h2c->settings_ack
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&& !(h2c->state.flags & NGX_HTTP_V2_END_STREAM_FLAG)
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&& h2scf->preread_size < NGX_HTTP_V2_DEFAULT_WINDOW)
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@@ -1349,6 +1358,12 @@
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rst_stream:
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+ if (h2c->refused_streams++ > ngx_max(h2scf->concurrent_streams, 100)) {
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+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
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+ "client sent too many refused streams");
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+ return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_NO_ERROR);
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+ }
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+
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if (ngx_http_v2_send_rst_stream(h2c, h2c->state.sid, status) != NGX_OK) {
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return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_INTERNAL_ERROR);
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}
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diff -r 3db945fda515 -r cdda286c0f1b src/http/v2/ngx_http_v2.h
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--- a/src/http/v2/ngx_http_v2.h Fri Sep 22 19:23:57 2023 +0400
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+++ b/src/http/v2/ngx_http_v2.h Tue Oct 10 15:13:39 2023 +0300
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@@ -172,6 +172,8 @@
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ngx_uint_t processing;
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ngx_uint_t frames;
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ngx_uint_t idle;
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+ ngx_uint_t new_streams;
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+ ngx_uint_t refused_streams;
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ngx_uint_t priority_limit;
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ngx_uint_t pushing;
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