X-Forwarded-Proto / X_FORWARDED_PROTO

Eric Wong normalperson at yhbt.net
Sun Jan 10 01:32:18 EST 2010


Eric Wong <normalperson at yhbt.net> wrote:
> Iñaki Baz Castillo <ibc at aliax.net> wrote:
> > In your case it seems valid for me (just an opinnion) as 
> > "HTTP_X_FORWARDED_PROTO: http,https" could mean that the request has been sent 
> > using HTTPS and an intermediary proxy has forwarded it using HTTP. Of course 
> > the final destination (Unicorn application) must be ready to support such 
> > syntax.
> 
> Is it safe to say that if there's an "https" *anywhere* in the
> X-Forwarded-Proto chain, that "rack.url_scheme" should be set to
> "https"?   Because I suppose most of the time there's only one
> (client-facing) proxy using https.

Maybe this will work...

diff --git a/ext/unicorn_http/global_variables.h b/ext/unicorn_http/global_variables.h
index e593cf6..6705851 100644
--- a/ext/unicorn_http/global_variables.h
+++ b/ext/unicorn_http/global_variables.h
@@ -74,7 +74,6 @@ void init_globals(void)
   DEF_GLOBAL(server_name, "SERVER_NAME");
   DEF_GLOBAL(server_port, "SERVER_PORT");
   DEF_GLOBAL(server_protocol, "SERVER_PROTOCOL");
-  DEF_GLOBAL(http_x_forwarded_proto, "HTTP_X_FORWARDED_PROTO");
   DEF_GLOBAL(port_80, "80");
   DEF_GLOBAL(port_443, "443");
   DEF_GLOBAL(localhost, "localhost");
diff --git a/ext/unicorn_http/unicorn_http.rl b/ext/unicorn_http/unicorn_http.rl
index 6232e2c..f3945b2 100644
--- a/ext/unicorn_http/unicorn_http.rl
+++ b/ext/unicorn_http/unicorn_http.rl
@@ -197,6 +197,14 @@ static void write_value(VALUE req, struct http_parser *hp,
     assert_frozen(f);
   }
 
+  /*
+   * any X-Forwarded-Proto: https means there's an https server in the
+   * proxy chain, and that server is most likely the one that actually
+   * sees the client, so help Rack apps generate URLs with "https"
+   */
+  if (f == g_http_x_forwarded_proto && STR_CSTR_EQ(v, "https"))
+    rb_hash_aset(req, g_rack_url_scheme, v);
+
   e = rb_hash_aref(req, f);
   if (NIL_P(e)) {
     hp->cont = rb_hash_aset(req, f, v);
@@ -393,12 +401,7 @@ static void finalize_header(struct http_parser *hp, VALUE req)
 
   /* set rack.url_scheme to "https" or "http", no others are allowed by Rack */
   if (NIL_P(temp)) {
-    temp = rb_hash_aref(req, g_http_x_forwarded_proto);
-    if (!NIL_P(temp) && STR_CSTR_EQ(temp, "https"))
-      server_port = g_port_443;
-    else
-      temp = g_http;
-    rb_hash_aset(req, g_rack_url_scheme, temp);
+    rb_hash_aset(req, g_rack_url_scheme, g_http);
   } else if (STR_CSTR_EQ(temp, "https")) {
     server_port = g_port_443;
   } else {
@@ -712,5 +715,6 @@ void Init_unicorn_http(void)
   SET_GLOBAL(g_http_transfer_encoding, "TRANSFER_ENCODING");
   SET_GLOBAL(g_content_length, "CONTENT_LENGTH");
   SET_GLOBAL(g_http_connection, "CONNECTION");
+  SET_GLOBAL(g_http_x_forwarded_proto, "X_FORWARDED_PROTO");
 }
 #undef SET_GLOBAL
-- 
Eric Wong


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