[tor/master] connection_edge: Return a web page when HTTPTunnelPort is misconfigured - tor-commits

23 Apr 2019

commit 728d20ed08122d2f34b001217faa009040fb2fee
Author: teor teor@torproject.org
Date:   Wed Apr 17 17:58:40 2019 +1000
connection_edge: Return a web page when HTTPTunnelPort is misconfigured
Return an informative web page when the HTTPTunnelPort is used as an
    HTTP proxy.
Closes ticket 27821, patch by "eighthave".
---
 changes/ticket27821           |  3 +++
 src/core/or/connection_edge.c | 27 ++++++++++++++++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/changes/ticket27821 b/changes/ticket27821
new file mode 100644
index 000000000..158f308fb
--- /dev/null
+++ b/changes/ticket27821
@@ -0,0 +1,3 @@
+  o Minor features (HTTP tunnel):
+    - Return an informative web page when the HTTPTunnelPort is used as an
+      HTTP proxy. Closes ticket 27821, patch by "eighthave".
diff --git a/src/core/or/connection_edge.c b/src/core/or/connection_edge.c
index 071a8c91e..4f7cbafe0 100644
--- a/src/core/or/connection_edge.c
+++ b/src/core/or/connection_edge.c
@@ -2810,6 +2810,31 @@ connection_ap_process_natd(entry_connection_t *conn)
   return connection_ap_rewrite_and_attach_if_allowed(conn, NULL, NULL);
 }
+static const char HTTP_CONNECT_IS_NOT_AN_HTTP_PROXY_MSG[] =
+  "HTTP/1.0 405 Method Not Allowed\r\n";
+  "Content-Type: text/html; charset=iso-8859-1\r\n\r\n"
+  "<html>\n"
+  "<head>\n"
+  "<title>This is an HTTP CONNECT tunnel, not an full HTTP Proxy</title>\n"
+  "</head>\n"
+  "<body>\n"
+  "<h1>This is an HTTP CONNECT tunnel, not an HTTP proxy.</h1>\n"
+  "<p>\n"
+  "It appears you have configured your web browser to use this Tor port as\n"
+  "an HTTP proxy.\n"
+  "</p><p>\n"
+  "This is not correct: This port is configured as a CONNECT tunnel, not\n"
+  "an HTTP proxy. Please configure your client accordingly.  You can also\n"
+  "use HTTPS, then the client should automatically use HTTP CONNECT."
+  "</p>\n"
+  "<p>\n"
+  "See <a href="https://www.torproject.org/documentation.html%5C%22%3E"
+  "https://www.torproject.org/documentation.html</a> for more "
+  "information.\n"
+  "</p>\n"
+  "</body>\n"
+  "</html>\n";
+
 /** Called on an HTTP CONNECT entry connection when some bytes have arrived,
  * but we have not yet received a full HTTP CONNECT request.  Try to parse an
  * HTTP CONNECT request from the connection's inbuf.  On success, set up the
@@ -2850,7 +2875,7 @@ connection_ap_process_http_connect(entry_connection_t *conn)
   tor_assert(command);
   tor_assert(addrport);
   if (strcasecmp(command, "connect")) {
-    errmsg = "HTTP/1.0 405 Method Not Allowed\r\n\r\n";
+    errmsg = HTTP_CONNECT_IS_NOT_AN_HTTP_PROXY_MSG;
     goto err;
   }

    