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Blame SOURCES/httpd-2.4.6-r1332643+.patch

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# ./pullrev.sh 1332643 1345599 1487772
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https://bugzilla.redhat.com//show_bug.cgi?id=809599
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http://svn.apache.org/viewvc?view=revision&revision=1332643
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http://svn.apache.org/viewvc?view=revision&revision=1345599
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http://svn.apache.org/viewvc?view=revision&revision=1487772
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--- httpd-2.4.6/modules/ssl/mod_ssl.c.r1332643+
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+++ httpd-2.4.6/modules/ssl/mod_ssl.c
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@@ -413,6 +413,37 @@ int ssl_engine_disable(conn_rec *c)
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     return 1;
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 }
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+static int modssl_register_npn(conn_rec *c, 
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+                               ssl_npn_advertise_protos advertisefn,
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+                               ssl_npn_proto_negotiated negotiatedfn)
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+{
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+#ifdef HAVE_TLS_NPN
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+    SSLConnRec *sslconn = myConnConfig(c);
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+
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+    if (!sslconn) {
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+        return DECLINED;
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+    }
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+
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+    if (!sslconn->npn_advertfns) {
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+        sslconn->npn_advertfns = 
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+            apr_array_make(c->pool, 5, sizeof(ssl_npn_advertise_protos));
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+        sslconn->npn_negofns = 
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+            apr_array_make(c->pool, 5, sizeof(ssl_npn_proto_negotiated));
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+    }
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+
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+    if (advertisefn)
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+        APR_ARRAY_PUSH(sslconn->npn_advertfns, ssl_npn_advertise_protos) =
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+            advertisefn;
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+    if (negotiatedfn)
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+        APR_ARRAY_PUSH(sslconn->npn_negofns, ssl_npn_proto_negotiated) =
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+            negotiatedfn;
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+
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+    return OK;
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+#else
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+    return DECLINED;
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+#endif
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+}
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+
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 int ssl_init_ssl_connection(conn_rec *c, request_rec *r)
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 {
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     SSLSrvConfigRec *sc;
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@@ -584,6 +615,7 @@ static void ssl_register_hooks(apr_pool_
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     APR_REGISTER_OPTIONAL_FN(ssl_proxy_enable);
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     APR_REGISTER_OPTIONAL_FN(ssl_engine_disable);
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+    APR_REGISTER_OPTIONAL_FN(modssl_register_npn);
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     ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "ssl",
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                               AUTHZ_PROVIDER_VERSION,
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--- httpd-2.4.6/modules/ssl/mod_ssl.h.r1332643+
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+++ httpd-2.4.6/modules/ssl/mod_ssl.h
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@@ -63,5 +63,40 @@ APR_DECLARE_OPTIONAL_FN(int, ssl_proxy_e
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 APR_DECLARE_OPTIONAL_FN(int, ssl_engine_disable, (conn_rec *));
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+/** The npn_advertise_protos callback allows another modules to add
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+ * entries to the list of protocol names advertised by the server
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+ * during the Next Protocol Negotiation (NPN) portion of the SSL
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+ * handshake.  The callback is given the connection and an APR array;
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+ * it should push one or more char*'s pointing to NUL-terminated
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+ * strings (such as "http/1.1" or "spdy/2") onto the array and return
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+ * OK.  To prevent further processing of (other modules') callbacks,
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+ * return DONE. */
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+typedef int (*ssl_npn_advertise_protos)(conn_rec *connection, 
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+                                        apr_array_header_t *protos);
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+
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+/** The npn_proto_negotiated callback allows other modules to discover
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+ * the name of the protocol that was chosen during the Next Protocol
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+ * Negotiation (NPN) portion of the SSL handshake.  Note that this may
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+ * be the empty string (in which case modules should probably assume
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+ * HTTP), or it may be a protocol that was never even advertised by
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+ * the server.  The callback is given the connection, a
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+ * non-NUL-terminated string containing the protocol name, and the
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+ * length of the string; it should do something appropriate
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+ * (i.e. insert or remove filters) and return OK.  To prevent further
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+ * processing of (other modules') callbacks, return DONE. */
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+typedef int (*ssl_npn_proto_negotiated)(conn_rec *connection, 
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+                                        const char *proto_name,
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+                                        apr_size_t proto_name_len);
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+
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+/* An optional function which can be used to register a pair of
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+ * callbacks for NPN handling.  This optional function should be
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+ * invoked from a pre_connection hook which runs *after* mod_ssl.c's
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+ * pre_connection hook.  The function returns OK if the callbacks are
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+ * register, or DECLINED otherwise (for example if mod_ssl does not
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+l * support NPN).  */
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+APR_DECLARE_OPTIONAL_FN(int, modssl_register_npn, (conn_rec *conn, 
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+                                                   ssl_npn_advertise_protos advertisefn,
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+                                                   ssl_npn_proto_negotiated negotiatedfn));
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+
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 #endif /* __MOD_SSL_H__ */
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 /** @} */
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--- httpd-2.4.6/modules/ssl/ssl_engine_init.c.r1332643+
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+++ httpd-2.4.6/modules/ssl/ssl_engine_init.c
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@@ -725,6 +725,11 @@ static void ssl_init_ctx_callbacks(serve
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 #endif
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     SSL_CTX_set_info_callback(ctx, ssl_callback_Info);
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+
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+#ifdef HAVE_TLS_NPN
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+    SSL_CTX_set_next_protos_advertised_cb(
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+        ctx, ssl_callback_AdvertiseNextProtos, NULL);
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+#endif
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 }
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 static void ssl_init_ctx_verify(server_rec *s,
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--- httpd-2.4.6/modules/ssl/ssl_engine_io.c.r1332643+
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+++ httpd-2.4.6/modules/ssl/ssl_engine_io.c
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@@ -297,6 +297,7 @@ typedef struct {
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     apr_pool_t *pool;
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     char buffer[AP_IOBUFSIZE];
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     ssl_filter_ctx_t *filter_ctx;
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+    int npn_finished;  /* 1 if NPN has finished, 0 otherwise */
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 } bio_filter_in_ctx_t;
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 /*
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@@ -1400,6 +1401,37 @@ static apr_status_t ssl_io_filter_input(
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         APR_BRIGADE_INSERT_TAIL(bb, bucket);
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     }
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+#ifdef HAVE_TLS_NPN
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+    /* By this point, Next Protocol Negotiation (NPN) should be completed (if
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+     * our version of OpenSSL supports it).  If we haven't already, find out
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+     * which protocol was decided upon and inform other modules by calling
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+     * npn_proto_negotiated_hook. */
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+    if (!inctx->npn_finished) {
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+        SSLConnRec *sslconn = myConnConfig(f->c);
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+        const unsigned char *next_proto = NULL;
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+        unsigned next_proto_len = 0;
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+        int n;
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+
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+        if (sslconn->npn_negofns) {
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+            SSL_get0_next_proto_negotiated(
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+                inctx->ssl, &next_proto, &next_proto_len);
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+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, f->c,
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+                          APLOGNO(02306) "SSL NPN negotiated protocol: '%*s'",
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+                          next_proto_len, (const char*)next_proto);
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+            
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+            for (n = 0; n < sslconn->npn_negofns->nelts; n++) {
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+                ssl_npn_proto_negotiated fn = 
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+                    APR_ARRAY_IDX(sslconn->npn_negofns, n, ssl_npn_proto_negotiated);
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+                
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+                if (fn(f->c, (const char *)next_proto, next_proto_len) == DONE)
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+                    break;
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+            }
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+        }
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+            
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+        inctx->npn_finished = 1;
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+    }
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+#endif
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+
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     return APR_SUCCESS;
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 }
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@@ -1881,6 +1913,7 @@ static void ssl_io_input_add_filter(ssl_
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     inctx->block = APR_BLOCK_READ;
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     inctx->pool = c->pool;
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     inctx->filter_ctx = filter_ctx;
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+    inctx->npn_finished = 0;
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 }
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 /* The request_rec pointer is passed in here only to ensure that the
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--- httpd-2.4.6/modules/ssl/ssl_engine_kernel.c.r1332643+
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+++ httpd-2.4.6/modules/ssl/ssl_engine_kernel.c
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@@ -2161,6 +2161,97 @@ int ssl_callback_SessionTicket(SSL *ssl,
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 }
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 #endif /* HAVE_TLS_SESSION_TICKETS */
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+#ifdef HAVE_TLS_NPN
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+/*
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+ * This callback function is executed when SSL needs to decide what protocols
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+ * to advertise during Next Protocol Negotiation (NPN).  It must produce a
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+ * string in wire format -- a sequence of length-prefixed strings -- indicating
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+ * the advertised protocols.  Refer to SSL_CTX_set_next_protos_advertised_cb
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+ * in OpenSSL for reference.
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+ */
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+int ssl_callback_AdvertiseNextProtos(SSL *ssl, const unsigned char **data_out,
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+                                     unsigned int *size_out, void *arg)
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+{
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+    conn_rec *c = (conn_rec*)SSL_get_app_data(ssl);
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+    SSLConnRec *sslconn = myConnConfig(c);
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+    apr_array_header_t *protos;
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+    int num_protos;
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+    unsigned int size;
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+    int i;
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+    unsigned char *data;
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+    unsigned char *start;
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+
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+    *data_out = NULL;
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+    *size_out = 0;
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+
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+    /* If the connection object is not available, or there are no NPN
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+     * hooks registered, then there's nothing for us to do. */
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+    if (c == NULL || sslconn->npn_advertfns == NULL) {
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+        return SSL_TLSEXT_ERR_OK;
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+    }
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+
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+    /* Invoke our npn_advertise_protos hook, giving other modules a chance to
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+     * add alternate protocol names to advertise. */
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+    protos = apr_array_make(c->pool, 0, sizeof(char *));
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+    for (i = 0; i < sslconn->npn_advertfns->nelts; i++) {
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+        ssl_npn_advertise_protos fn = 
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+            APR_ARRAY_IDX(sslconn->npn_advertfns, i, ssl_npn_advertise_protos);
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+        
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+        if (fn(c, protos) == DONE)
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+            break;
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+    }
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+    num_protos = protos->nelts;
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+
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+    /* We now have a list of null-terminated strings; we need to concatenate
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+     * them together into a single string, where each protocol name is prefixed
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+     * by its length.  First, calculate how long that string will be. */
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+    size = 0;
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+    for (i = 0; i < num_protos; ++i) {
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+        const char *string = APR_ARRAY_IDX(protos, i, const char*);
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+        unsigned int length = strlen(string);
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+        /* If the protocol name is too long (the length must fit in one byte),
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+         * then log an error and skip it. */
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+        if (length > 255) {
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+            ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02307)
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+                          "SSL NPN protocol name too long (length=%u): %s",
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+                          length, string);
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+            continue;
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+        }
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+        /* Leave room for the length prefix (one byte) plus the protocol name
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+         * itself. */
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+        size += 1 + length;
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+    }
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+
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+    /* If there is nothing to advertise (either because no modules added
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+     * anything to the protos array, or because all strings added to the array
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+     * were skipped), then we're done. */
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+    if (size == 0) {
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+        return SSL_TLSEXT_ERR_OK;
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+    }
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+
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+    /* Now we can build the string.  Copy each protocol name string into the
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+     * larger string, prefixed by its length. */
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+    data = apr_palloc(c->pool, size * sizeof(unsigned char));
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+    start = data;
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+    for (i = 0; i < num_protos; ++i) {
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+        const char *string = APR_ARRAY_IDX(protos, i, const char*);
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+        apr_size_t length = strlen(string);
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+        if (length > 255)
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+            continue;
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+        *start = (unsigned char)length;
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+        ++start;
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+        memcpy(start, string, length * sizeof(unsigned char));
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+        start += length;
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+    }
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+
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+    /* Success. */
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+    *data_out = data;
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+    *size_out = size;
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+    return SSL_TLSEXT_ERR_OK;
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+}
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+
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+#endif /* HAVE_TLS_NPN */
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+
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 #ifndef OPENSSL_NO_SRP
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 int ssl_callback_SRPServerParams(SSL *ssl, int *ad, void *arg)
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--- httpd-2.4.6/modules/ssl/ssl_private.h.r1332643+
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+++ httpd-2.4.6/modules/ssl/ssl_private.h
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@@ -98,6 +98,8 @@
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 #include <openssl/x509_vfy.h>
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 #include <openssl/ocsp.h>
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+#include "mod_ssl.h"
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+
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 /* Avoid tripping over an engine build installed globally and detected
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  * when the user points at an explicit non-engine flavor of OpenSSL
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  */
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@@ -139,6 +141,11 @@
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 #define HAVE_FIPS
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 #endif
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+#if OPENSSL_VERSION_NUMBER >= 0x10001000L && !defined(OPENSSL_NO_NEXTPROTONEG) \
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+    && !defined(OPENSSL_NO_TLSEXT)
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+#define HAVE_TLS_NPN
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+#endif
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+
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 #if (OPENSSL_VERSION_NUMBER >= 0x10000000)
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 #define MODSSL_SSL_CIPHER_CONST const
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 #define MODSSL_SSL_METHOD_CONST const
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@@ -487,6 +494,12 @@ typedef struct {
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                      * connection */
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     } reneg_state;
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+#ifdef HAVE_TLS_NPN
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+    /* Poor man's inter-module optional hooks for NPN. */
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+    apr_array_header_t *npn_advertfns; /* list of ssl_npn_advertise_protos callbacks */
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+    apr_array_header_t *npn_negofns; /* list of ssl_npn_proto_negotiated callbacks. */
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+#endif
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+
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     server_rec *server;
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 } SSLConnRec;
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@@ -842,6 +855,7 @@ int          ssl_callback_ServerNameIndi
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 int         ssl_callback_SessionTicket(SSL *, unsigned char *, unsigned char *,
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                                        EVP_CIPHER_CTX *, HMAC_CTX *, int);
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 #endif
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+int ssl_callback_AdvertiseNextProtos(SSL *ssl, const unsigned char **data, unsigned int *len, void *arg);
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 /**  Session Cache Support  */
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 void         ssl_scache_init(server_rec *, apr_pool_t *);