Installation
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## Installation

ModSecurity installation consists of the following steps:

1. ModSecurity 2.x works with Apache 2.0.x or better.

2. Make sure you have `mod_unique_id` installed.

   mod_unique_id is packaged with Apache httpd.

3. Install the latest version of libxml2, if it isn't already installed on the server.

   http://xmlsoft.org/downloads.html

4. Optionally install the latest version of Lua in the 5.1.x branch, if it isn't already installed on the server and you will be using the new Lua engine.

   http://www.lua.org/download.html

   Note that ModSecurity requires the dynamic libraries. These are not built by default in the source distribution, so the binary distribution is recommended.

5. Stop Apache httpd

6. Unpack the ModSecurity archive

7. Building differs for UNIX (or UNIX-like) operating systems and Windows.

   - UNIX

     1. Run the configure script to generate a Makefile. Typically no options are needed.

        `./configure`

        Options are available for more customization (use `./configure --help` for a full list), but typically you will only need to specify the location of the `apxs` command installed by Apache httpd with the `--with-apxs` option.

        `./configure --with-apxs=/path/to/httpd-2.x.y/bin/apxs`

        ### Note

        There are certain configure options that are meant for debugging an other development use. If enabled, these options can substantially impact performance. These options include all `--debug-*` options as well as the `--enable-performance-measurements` options.

     2. Compile with: `make`

     3. Optionally test with: `make test`

        ### Note

        This is step is still a bit experimental. If you have problems, please send the full output and error from the build to the support list. Most common issues are related to not finding the required headers and/or libraries.

     4. Optionally build the ModSecurity Log Collector with: `make mlogc`

     5. Optionally install `mlogc`: Review the `INSTALL` file included in the apache2/mlogc-src directory in the distribution.

     6. Install the ModSecurity module with: `make install`

   - Windows (MS VC++ 8)

     1. Edit `Makefile.win` to configure the Apache base and library paths.

     2. Compile with: `nmake -f Makefile.win`

     3. Install the ModSecurity module with: `nmake -f Makefile.win install`

     4. Copy the `libxml2.dll` and `lua5.1.dll` to the Apache `bin` directory. Alternatively you can follow the step below for using LoadFile to load these libraries.

8. Edit the main Apache httpd config file (usually `httpd.conf`)

   On UNIX (and Windows if you did not copy the DLLs as stated above) you must load libxml2 and lua5.1 before ModSecurity with something like this:

       LoadFile /usr/lib/libxml2.so
       LoadFile /usr/lib/liblua5.1.so

   Load the ModSecurity module with:

       LoadModule security2_module modules/mod_security2.so

9. Configure ModSecurity

10. Start Apache httpd

11. You should now have ModSecurity 2.x up and running.

### Note

If you have compiled Apache yourself you might experience problems compiling ModSecurity against PCRE. This is because Apache bundles PCRE but this library is also typically provided by the operating system. I would expect most (all) vendor-packaged Apache distributions to be configured to use an external PCRE library (so this should not be a problem).

You want to avoid Apache using the bundled PCRE library and ModSecurity linking against the one provided by the operating system. The easiest way to do this is to compile Apache against the PCRE library provided by the operating system (or you can compile it against the latest PCRE version you downloaded from the main PCRE distribution site). You can do this at configure time using the`--with-pcre` switch. If you are not in a position to recompile Apache, then, to compile ModSecurity successfully, you'd still need to have access to the bundled PCRE headers (they are available only in the Apache source code) and change the include path for ModSecurity (as you did in step 7 above) to point to them (via the `--with-pcre` ModSecurity configure option).

Do note that if your Apache is using an external PCRE library you can compile ModSecurity with `WITH_PCRE_STUDY` defined,which would possibly give you a slight performance edge in regular expression processing.

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