ngx-libinjection
Simple module integrating libinjection as a basic access phase handler. Defined query parameters are evaluated against libinjection; requests containing param values flagged as potential SQL injection are rejected as forbidden.
libinjection must first be built and referenced by the environmental variable LIBINJECTION_PATH. Because both the source and object files in libinjection live in the projects src directory, it's easiest to just reference this sub directory:
$ git clone https://github.com/client9/libinjection.git && cd libinjection && make all
$ export LIBINJECTION_PATH=/path/to/libinjection/srcAnd configure Nginx with this module as any other module:
$ ./configure --add-module=/path/to/ngx-libinjectionBy default, Nginx will link to libinjection as a shared object; if you wish to link libinjection statically into the Nginx binary, define the variable LIBINJECTION_STATIC:
$ export LIBINJECTION_STATIC=yesserver {
libinjection on;
libinjection_patterns foo;
libinjection_patterns ba?;
}
$ curl "localhost/index.html?foo=bar&bat=-1%27%20and%201%3D1%20union%2F*%20foo%20*%2Fselect%20load_file(%27%2Fetc%2Fpasswd%27)--%20"
<html>
<head><title>403 Forbidden</title></head>
<body bgcolor="white">
<center><h1>403 Forbidden</h1></center>
<hr><center>nginx/1.13.9</center>
</body>
</html>Syntax: libinjection on | off
Default: libinjection off
Context: http, server, location
Enables processing of query string params with libinjection.
Syntax: libinjection_body on | off
Default: libinjection_body off
Context: http, server, location
Enables processing of request body params when the request content type is application/x-www-form-urlencoded. Note that the request body must be buffered into memory (see client_body_buffer_size).
Syntax: libinjection_keys foo
Default: -
Context: http, server, location
Defines a regular expression to search against the list of parameter keys in the query string. Matching keys will have their values passed to libinjection. Multiple patterns can be defined with multiple directives.
- Refactor argument searching to improve on subquadratic performance.
Copyright (c) 2018, Robert Paprocki
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