# HG changeset patch
# User Sergey Kandaurov <pluknet@nginx.com>
# Date 1697810707 -14400
# Node ID 60c4e8d3151f5077c2f3641cb6e3335e38aabcf7
# Parent  ff98ae7d261e1a7f58963ac91eac9caecc9d6aee
QUIC: added safety belt to prevent using discarded keys.

In addition to triggering alert, it ensures that such packets won't be sent.

With the previous change that marks server keys as discarded by zeroing the
key lengh, it is now an error to send packets with discarded keys.  OpenSSL
based stacks tolerate such behaviour because key length isn't used in packet
protection, but BoringSSL will raise the UNSUPPORTED_KEY_SIZE cipher error.
It won't be possible to use discarded keys with reused crypto contexts as it
happens in subsequent changes.

diff --git a/src/event/quic/ngx_event_quic_output.c b/src/event/quic/ngx_event_quic_output.c
--- a/src/event/quic/ngx_event_quic_output.c
+++ b/src/event/quic/ngx_event_quic_output.c
@@ -519,6 +519,21 @@ ngx_quic_output_packet(ngx_connection_t 
 
     qc = ngx_quic_get_connection(c);
 
+    if (!ngx_quic_keys_available(qc->keys, ctx->level, 1)) {
+        ngx_log_error(NGX_LOG_ALERT, c->log, 0, "quic %s write keys discarded",
+                      ngx_quic_level_name(ctx->level));
+
+        while (!ngx_queue_empty(&ctx->frames)) {
+            q = ngx_queue_head(&ctx->frames);
+            ngx_queue_remove(q);
+
+            f = ngx_queue_data(q, ngx_quic_frame_t, queue);
+            ngx_quic_free_frame(c, f);
+        }
+
+        return 0;
+    }
+
     ngx_quic_init_packet(c, ctx, &pkt, qc->path);
 
     min_payload = ngx_quic_payload_size(&pkt, min);