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Preserve original DCID and unbreak parsing 0-RTT packets.

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As per QUIC transport, the first flight of 0-RTT packets obviously uses same
Destination and Source Connection ID values as the client's first Initial.

The fix is to match 0-RTT against original DCID after it has been switched.
This commit is contained in:
Sergey Kandaurov 2020-05-12 18:18:58 +03:00
parent 95ff5f6be4
commit b6e8c1b542
1 changed files with 15 additions and 3 deletions
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18
src/event/ngx_event_quic.c
View file

@ -87,6 +87,7 @@ typedef struct {
struct ngx_quic_connection_s {
ngx_str_t scid;
ngx_str_t dcid;
ngx_str_t odcid;
ngx_str_t token;
ngx_uint_t client_tp_done;
@ -621,6 +622,13 @@ ngx_quic_new_connection(ngx_connection_t *c, ngx_ssl_t *ssl, ngx_quic_tp_t *tp,
ngx_quic_hexdump(c->log, "quic server CID", qc->dcid.data, qc->dcid.len);
#endif
qc->odcid.len = pkt->dcid.len;
qc->odcid.data = ngx_pnalloc(c->pool, qc->odcid.len);
if (qc->odcid.data == NULL) {
return NGX_ERROR;
}
ngx_memcpy(qc->odcid.data, pkt->dcid.data, qc->odcid.len);
qc->scid.len = pkt->scid.len;
qc->scid.data = ngx_pnalloc(c->pool, qc->scid.len);
if (qc->scid.data == NULL) {
@ -638,7 +646,7 @@ ngx_quic_new_connection(ngx_connection_t *c, ngx_ssl_t *ssl, ngx_quic_tp_t *tp,
keys = &c->quic->keys[ssl_encryption_initial];
if (ngx_quic_set_initial_secret(c->pool, &keys->client, &keys->server,
&pkt->dcid)
&qc->odcid)
!= NGX_OK)
{
return NGX_ERROR;
@ -1232,12 +1240,16 @@ ngx_quic_early_input(ngx_connection_t *c, ngx_quic_header_t *pkt)
static ngx_int_t
ngx_quic_check_peer(ngx_quic_connection_t *qc, ngx_quic_header_t *pkt)
{
if (pkt->dcid.len != qc->dcid.len) {
ngx_str_t *dcid;
dcid = ngx_quic_pkt_zrtt(pkt->flags) ? &qc->odcid : &qc->dcid;
if (pkt->dcid.len != dcid->len) {
ngx_log_error(NGX_LOG_INFO, pkt->log, 0, "quic unexpected quic dcidl");
return NGX_ERROR;
}
if (ngx_memcmp(pkt->dcid.data, qc->dcid.data, qc->dcid.len) != 0) {
if (ngx_memcmp(pkt->dcid.data, dcid->data, dcid->len) != 0) {
ngx_log_error(NGX_LOG_INFO, pkt->log, 0, "quic unexpected quic dcid");
return NGX_ERROR;
}