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Name
xss-nginx-module - Native cross-site scripting support in nginx
Synopsis
# accessing /foo?callback=process gives the response
# body "process(...);" (without quotes) where "..."
# is the original response body of the /foo location.
server {
location /foo {
# your content handler goes here...
xss_get on;
xss_callback_arg 'callback';
xss_input_types 'application/json'; # default
xss_output_type 'application/x-javascript'; # default
}
...
}
Description
This module adds cross-site AJAX support to nginx. Currently only
cross-site GET is supported. But cross-site POST will be added
in the future.
The cross-site GET is currently implemented as JSONP
(or "JSON with padding"). See <http://en.wikipedia.org/wiki/JSON#JSONP >
for more details.
Directives
* xss_get on | off
Syntax: xss_get on | off
Default: xss_get off
Context: main, http, location, if location
Enable JSONP support for GET requests.
* xss_callback_arg
Syntax: xss_callback_arg <name>
Default: none
Context: main, http, location, if location
Specify the JavaScript callback function name
used in the responses.
For example,
location /foo {
xss_get on;
xss_callback_arg c;
...
}
then
GET /foo?c=blah
returns
blah(...);
* xss_override_status
Syntax: xss_override_status on | off
Default: xss_check_status on
Context: main, http, location, if location
Whether to override 30x, 40x and 50x status to 200
when the response is actually being processed.
* xss_check_status
Syntax: xss_check_status on | off
Default: xss_check_status on
Context: main, http, location, if location
By default, ngx_xss only process responses with the status code
200 or 201.
* xss_input_types
Syntax: xss_input_types [mime-type]...
Default: xss_input_types application/json
Context: main, http, location, if location
Only processes the responses of the specified MIME types.
Example:
xss_input_types application/json text/plain;
Limitations
* ngx_xss will not work with ngx_echo's subrequest interfaces, due to the underlying
limitations imposed by subrequests' "postponed chain" mechanism in the nginx core.
The standard ngx_addition module also falls into this category. You're recommended,
however, to use ngx_lua as the content handler to issue subrequests *and* ngx_xss
to do JSONP, because ngx_lua's ngx.location.capture() interface does not utilize the
"postponed chain" mechanism, thus getting out of this limitation. We're taking this
approach in production and it works great.
Trouble Shooting
Use the "info" error log level (or lower) to get more
diagnostics when things go wrong.
Installation
Grab the nginx source code from nginx.net (<http://nginx.net/>), for
example, the version 1.4.3 (see nginx compatibility), and then build
the source with this module:
$ wget 'http://nginx.org/download/nginx-1.4.3.tar.gz'
$ tar -xzvf nginx-1.4.3.tar.gz
$ cd nginx-1.4.3/
# Here we assume you would install you nginx under /opt/nginx/.
$ ./configure --prefix=/opt/nginx \
--add-module=/path/to/xss-nginx-module
$ make -j2
$ make install
Download the latest version of the release tarball of this module from
xss-nginx-module file list
(<http://github.com/agentzh/xss-nginx-module/tags>).
Compatibility
The following versions of Nginx should work with this module:
* 1.4.x (last tested: 1.4.3)
* 1.2.x (last tested: 1.2.9)
* 1.0.x (last tested: 1.0.10)
* 0.9.x (last tested: 0.9.4)
* 0.8.x (last tested: 0.8.54)
* 0.7.x >= 0.7.30 (last tested: 0.7.67)
Earlier versions of Nginx like 0.6.x and 0.5.x will *not* work.
If you find that any particular version of Nginx above 0.7.30 does not
work with this module, please consider reporting a bug.
TODO
* add cross-site POST support.
Known Issues
See Also
* Introduction to JSONP ( http://en.wikipedia.org/wiki/JSONP )
* ngx_drizzle ( http://github.com/chaoslawful/drizzle-nginx-module )
Author
agentzh (章亦春) <agentzh at gmail dot com>
Copyright & License
The implementation of the builtin connection pool has borrowed
a lot of code from Maxim Dounin's upstream_keepalive module.
This part of code is copyrighted by Maxim Dounin.
This module is licenced under the BSD license.
Copyright (C) 2009-2011 by Zhang "agentzh" Yichun (章亦春) <agentzh@gmail.com>.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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