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HTTP: connections with wrong ALPN protocols are now rejected.

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This is a recommended behavior by RFC 7301 and is useful
for mitigation of protocol confusion attacks [1].

To avoid possible negative effects, list of supported protocols
was extended to include all possible HTTP protocol ALPN IDs
registered by IANA [2], i.e. "http/1.0" and "http/0.9".

[1] https://alpaca-attack.com/
[2] https://www.iana.org/assignments/tls-extensiontype-values/
This commit is contained in:
Vladimir Homutov 2021-10-20 09:50:02 +03:00
parent df472eecc0
commit ebb6f7d656
1 changed files with 6 additions and 7 deletions
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13
src/http/modules/ngx_http_ssl_module.c
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@ -17,7 +17,7 @@ typedef ngx_int_t (*ngx_ssl_variable_handler_pt)(ngx_connection_t *c,
#define NGX_DEFAULT_CIPHERS "HIGH:!aNULL:!MD5"
#define NGX_DEFAULT_ECDH_CURVE "auto"
#define NGX_HTTP_ALPN_PROTO "\x08http/1.1"
#define NGX_HTTP_ALPN_PROTOS "\x08http/1.1\x08http/1.0\x08http/0.9"
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
@ -442,21 +442,20 @@ ngx_http_ssl_alpn_select(ngx_ssl_conn_t *ssl_conn, const unsigned char **out,
hc = c->data;
if (hc->addr_conf->http2) {
srv = (unsigned char *) NGX_HTTP_V2_ALPN_PROTO NGX_HTTP_ALPN_PROTO;
srvlen = sizeof(NGX_HTTP_V2_ALPN_PROTO NGX_HTTP_ALPN_PROTO) - 1;
srv = (unsigned char *) NGX_HTTP_V2_ALPN_PROTO NGX_HTTP_ALPN_PROTOS;
srvlen = sizeof(NGX_HTTP_V2_ALPN_PROTO NGX_HTTP_ALPN_PROTOS) - 1;
} else
#endif
{
srv = (unsigned char *) NGX_HTTP_ALPN_PROTO;
srvlen = sizeof(NGX_HTTP_ALPN_PROTO) - 1;
srv = (unsigned char *) NGX_HTTP_ALPN_PROTOS;
srvlen = sizeof(NGX_HTTP_ALPN_PROTOS) - 1;
}
if (SSL_select_next_proto((unsigned char **) out, outlen, srv, srvlen,
in, inlen)
!= OPENSSL_NPN_NEGOTIATED)
{
return SSL_TLSEXT_ERR_NOACK;
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,