rgw: Bucket policies are evaluated against the remote ip address.

Previously bucket policy ip address restrictions were being evaluated
against the HTTP_HOST header. That is typically a host/port pair of the
server running rgw.

Signed-off-by: John Gibson <jgibson@mitre.org>

src/rgw/rgw_civetweb.cc

@@ -120,6 +120,9 @@ void RGWCivetWeb::init_env(CephContext *cct)
   if (info->remote_user) {
     env.set("REMOTE_USER", info->remote_user);
   }
+  if (info->remote_addr) {
+    env.set("REMOTE_ADDR", info->remote_addr);
+  }
 
   if (port <= 0)
     lderr(cct) << "init_env: bug: invalid port number" << dendl;

src/rgw/rgw_op.cc

@@ -614,7 +614,7 @@ rgw::IAM::Environment rgw_build_iam_environment(RGWRados* store,
 	      std::forward_as_tuple("true"));
   }
 
-  i = m.find("HTTP_HOST");
+  i = m.find("REMOTE_ADDR");
   if (i != m.end()) {
     e.emplace(std::piecewise_construct,
 	      std::forward_as_tuple("aws:SourceIp"),