Add "Cross-origin resource sharing" (CORS) support

[privoxy.git] / cgi.c

diff --git a/cgi.c b/cgi.c
index 63eff59..c67aed4 100644 (file)
--- a/cgi.c
+++ b/cgi.c
@@ -1,4 +1,3 @@
-const char cgi_rcs[] = "$Id: cgi.c,v 1.166 2017/01/23 13:02:45 fabiankeil Exp $";
 /*********************************************************************
  *
  * File        :  $Source: /cvsroot/ijbswa/current/cgi.c,v $
@@ -8,7 +7,7 @@ const char cgi_rcs[] = "$Id: cgi.c,v 1.166 2017/01/23 13:02:45 fabiankeil Exp $"
  *                This only contains the framework functions, the
  *                actual handler functions are declared elsewhere.
  *
- * Copyright   :  Written by and Copyright (C) 2001-2004, 2006-2008
+ * Copyright   :  Written by and Copyright (C) 2001-2017
  *                members of the Privoxy team. http://www.privoxy.org/
  *
  *                Based on the Internet Junkbuster originally written
@@ -69,8 +68,6 @@ const char cgi_rcs[] = "$Id: cgi.c,v 1.166 2017/01/23 13:02:45 fabiankeil Exp $"
 /* jcc.h is for mutex semaphore globals only */
 #include "jcc.h"
 
-const char cgi_h_rcs[] = CGI_H_VERSION;
-
 /*
  * List of CGI functions: name, handler, description
  * Note: Do NOT use single quotes in the description;
@@ -96,10 +93,6 @@ static const struct cgi_dispatcher cgi_dispatchers[] = {
         "View the current configuration",
 #endif
          TRUE },
-   { "show-version",
-         cgi_show_version,
-         "View the source code version numbers",
-          TRUE },
 #ifdef FEATURE_CLIENT_TAGS
    /*
     * This is marked as harmless because despite the description
@@ -441,6 +434,7 @@ static int referrer_is_safe(const struct client_state *csp)
 {
    char *referrer;
    static const char alternative_prefix[] = "http://" CGI_SITE_1_HOST "/";
+   const char *trusted_cgi_referrer = csp->config->trusted_cgi_referrer;
 
    referrer = grep_cgi_referrer(csp);
 
@@ -459,6 +453,18 @@ static int referrer_is_safe(const struct client_state *csp)
 
       return TRUE;
    }
+   else if ((trusted_cgi_referrer != NULL) && (0 == strncmp(referrer,
+            trusted_cgi_referrer, strlen(trusted_cgi_referrer))))
+   {
+      /*
+       * After some more testing this block should be merged with
+       * the previous one or the log level should bedowngraded.
+       */
+      log_error(LOG_LEVEL_INFO, "Granting access to %s based on trusted referrer %s",
+         csp->http->url, referrer);
+
+      return TRUE;
+   }
    else
    {
       /* Untrustworthy referrer */
@@ -1051,6 +1057,8 @@ jb_err cgi_error_disabled(const struct client_state *csp,
    assert(csp);
    assert(rsp);
 
+   rsp->status = strdup_or_die("403 Request not trusted or feature disabled");
+
    if (NULL == (exports = default_exports(csp, "cgi-error-disabled")))
    {
       return JB_ERR_MEMORY;
@@ -1387,7 +1395,7 @@ char *add_help_link(const char *item,
    }
    else
    {
-      string_append(&result, "https://");
+      string_append(&result, "http://");
       string_append(&result, CGI_SITE_2_HOST);
       string_append(&result, "/user-manual/");
    }
@@ -1577,6 +1585,18 @@ struct http_response *finish_http_response(struct client_state *csp, struct http
       return rsp;
    }
 
+   /*
+    * Add "Cross-origin resource sharing" (CORS) headers if enabled
+    */
+   if (NULL != csp->config->cors_allowed_origin)
+   {
+      enlist_unique_header(rsp->headers, "Access-Control-Allow-Origin",
+         strdup_or_die(csp->config->cors_allowed_origin));
+      enlist_unique_header(rsp->headers, "Access-Control-Allow-Methods", "GET,POST");
+      enlist_unique_header(rsp->headers, "Access-Control-Allow-Headers", "X-Requested-With");
+      enlist_unique_header(rsp->headers, "Access-Control-Max-Age", "86400");
+   }
+
    /*
     * Fill in the HTTP Status, using HTTP/1.1
     * unless the client asked for HTTP/1.0.
@@ -2111,15 +2131,12 @@ jb_err template_fill_for_cgi(const struct client_state *csp,
    err = template_load(csp, &rsp->body, templatename, 0);
    if (err == JB_ERR_FILE)
    {
-      free_map(exports);
-      return cgi_error_no_template(csp, rsp, templatename);
+      err = cgi_error_no_template(csp, rsp, templatename);
    }
-   else if (err)
+   else if (err == JB_ERR_OK)
    {
-      free_map(exports);
-      return err; /* JB_ERR_MEMORY */
+      err = template_fill(&rsp->body, exports);
    }
-   err = template_fill(&rsp->body, exports);
    free_map(exports);
    return err;
 }