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QUIC: added ALPN checks.

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quic-transport draft 29:

    section 7:

    *  authenticated negotiation of an application protocol (TLS uses
       ALPN [RFC7301] for this purpose)

    ...

    Endpoints MUST explicitly negotiate an application protocol.  This
    avoids situations where there is a disagreement about the protocol
    that is in use.

    section 8.1:

    When using ALPN, endpoints MUST immediately close a connection (see
    Section 10.3 of [QUIC-TRANSPORT]) with a no_application_protocol TLS
    alert (QUIC error code 0x178; see Section 4.10) if an application
    protocol is not negotiated.

Changes in ngx_quic_close_quic() function are required to avoid attempts
to generated and send packets without proper keys, what happens in case
of failed ALPN check.
This commit is contained in:
Vladimir Homutov 2020-06-18 13:58:46 +03:00
parent a213258b5b
commit 28f1acdb6f
2 changed files with 32 additions and 3 deletions
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30
src/event/ngx_event_quic.c
View File

@ -393,6 +393,31 @@ ngx_quic_add_handshake_data(ngx_ssl_conn_t *ssl_conn,
"quic ngx_quic_add_handshake_data");
if (!qc->client_tp_done) {
/*
* things to do once during handshake: check ALPN and transport
* parameters; we want to break handshake if something is wrong
* here;
*/
#if defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
{
unsigned int len;
const unsigned char *data;
SSL_get0_alpn_selected(c->ssl->connection, &data, &len);
if (len != NGX_QUIC_ALPN_LEN
|| ngx_strncmp(data, NGX_QUIC_ALPN_STR, NGX_QUIC_ALPN_LEN) != 0)
{
qc->error = 0x100 + SSL_AD_NO_APPLICATION_PROTOCOL;
qc->error_reason = "unsupported protocol in ALPN extension";
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"quic unsupported protocol in ALPN extension");
return 0;
}
}
#endif
SSL_get_peer_quic_transport_params(ssl_conn, &client_params,
&client_params_len);
@ -1298,9 +1323,8 @@ ngx_quic_close_quic(ngx_connection_t *c, ngx_int_t rc)
qc->error_reason ? qc->error_reason : "");
}
level = (qc->state == ssl_encryption_early_data)
? ssl_encryption_handshake
: qc->state;
level = c->ssl ? SSL_quic_read_level(c->ssl->connection)
: ssl_encryption_initial;
(void) ngx_quic_send_cc(c, level, err, qc->error_ftype,
qc->error_reason);

5
src/event/ngx_event_quic.h
View File

@ -18,6 +18,11 @@
#endif
#define NGX_QUIC_VERSION (0xff000000 + NGX_QUIC_DRAFT_VERSION)
#define NGX_QUIC_ALPN(s) NGX_QUIC_ALPN_DRAFT(s)
#define NGX_QUIC_ALPN_DRAFT(s) "h3-" #s
#define NGX_QUIC_ALPN_STR NGX_QUIC_ALPN(NGX_QUIC_DRAFT_VERSION)
#define NGX_QUIC_ALPN_LEN (sizeof(NGX_QUIC_ALPN_STR) - 1)
#define NGX_QUIC_MAX_SHORT_HEADER 25 /* 1 flags + 20 dcid + 4 pn */
#define NGX_QUIC_MAX_LONG_HEADER 56
/* 1 flags + 4 version + 2 x (1 + 20) s/dcid + 4 pn + 4 len + token len */