SimpleSAMLphp Installation and Configuration

This document is part of the SimpleSAMLphp documentation suite.

This document covers the installation of the latest stable version of SimpleSAMLphp. If you want to install the development version, take a look at the instructions for installing SimpleSAMLphp from the repository .

Prerequisites

What actual packages are required for the various extensions varies between different platforms and distributions.

Download and install SimpleSAMLphp

The most recent release of SimpleSAMLphp can always be found at https://simplesamlphp.org/download .

Go to the directory where you want to install SimpleSAMLphp and extract the archive file you just downloaded: 

cd /var
tar xzf simplesamlphp-x.y.z.tar.gz
mv simplesamlphp-x.y.z simplesamlphp

Upgrading from a previous version of SimpleSAMLphp

Before starting the upgrade, review the relevant upgrade notes for any relevant changes.

Extract the new version: 

cd /var
tar xzf simplesamlphp-x.y.z.tar.gz

Copy the configuration files from the previous version (in case the configuration directory is inside SimpleSAMLphp, keep reading for other alternatives): 

cd /var/simplesamlphp-x.y.z
rm -rf config metadata
cp -rv ../simplesamlphp/config config
cp -rv ../simplesamlphp/metadata metadata

If you have installed any third-party modules or customised the theme , you should check whether your third-party modules need upgrading and then copy or replace those directories too.

Replace the old version with the new version: 

cd /var
mv simplesamlphp simplesamlphp.old
mv simplesamlphp-x.y.z simplesamlphp

If the format of the config files or metadata has changed from your previous version of SimpleSAMLphp (check the upgrade notes), you may have to update your configuration and metadata after updating the SimpleSAMLphp code.

Upgrading configuration files

A good approach is to run a diff between your previous config.php file and the new config.php.dist file located the same directory, and apply relevant modifications to the new template. This will ensure that all new entries in the latest version of config.php are included, as well as preserve your local modifications.

Upgrading metadata files

Most likely the metadata format is backwards compatible. If not, you should receive a very clear error message at startup indicating how and what you need to update. You should look through the metadata in the metadata-templates directory after the upgrade to see whether recommended defaults have been changed.

Configuration

Location of configuration files

By default, SimpleSAMLphp looks for its configuration in the config directory in the root of its own directory. This has some drawbacks, like making it harder to update SimpleSAMLphp or to install it as a composer dependency, or to package it for different operating systems.

In order to avoid this limitations, it is possible to specify an alternative location for the configuration directory by setting the SIMPLESAMLPHP_CONFIG_DIR environment variable to point to this location. This way, the configuration directory doesn't need to be inside the library's directory, making it easier to manage and to update. The simplest way to set this environment variable is to set it in your web server's configuration. See the next section for more information.

Configuring Apache

Examples below assume that SimpleSAMLphp is installed in the default location, /var/simplesamlphp . You may choose another location, but this requires a path update in a few files. See Appendix Installing SimpleSAMLphp in alternative locations for more details.

The only subdirectory of SimpleSAMLphp that needs to be accessible from the web is public . There are several ways of exposing SimpleSAMLphp depending on the way web sites are structured on your Apache web server. The following is just one possible configuration.

Find the Apache configuration file for the virtual hosts where you want to run SimpleSAMLphp. The configuration may look like this: 

<VirtualHost *>
    ServerName service.example.com
    DocumentRoot /var/www/service.example.com

    SetEnv SIMPLESAMLPHP_CONFIG_DIR /var/simplesamlphp/config

    Alias /simplesaml /var/simplesamlphp/public

    <Directory /var/simplesamlphp/public>
        Require all granted
    </Directory>
</VirtualHost>

Note the Alias directive, which gives control to SimpleSAMLphp for all urls matching http(s)://service.example.com/simplesaml/* . SimpleSAMLphp makes several SAML interfaces available on the web; all of them are accessible through the public subdirectory of your SimpleSAMLphp installation. You can name the alias whatever you want, but the name must be specified in the baseurlpath configuration option in the config.php file of SimpleSAMLphp as described in the section called “SimpleSAMLphp configuration: config.php” . Here is an example of how this configuration may look like in config.php : 

$config = [
    [...]
    'baseurlpath' => 'simplesaml/',
    [...]
]

Note also the SetEnv directive in the Apache configuration. It sets the SIMPLESAMLPHP_CONFIG_DIR environment variable, in this case, to the default location for the configuration directory. You can omit this environment variable, and SimpleSAMLphp will then look for the config directory inside its own directory. If you need to move your configuration to a different location, you can use this environment variable to tell SimpleSAMLphp where to look for configuration files. This works only for the config directory. If you need your metadata to be in a different directory too, use the metadatadir configuration option to specify the location.

This is just the basic configuration to get things working. For a checklist further completing your documentation, please see Maintenance and configuration: Apache .

Configuring Nginx

Examples below assume that SimpleSAMLphp is installed in the default location, /var/simplesamlphp . You may choose another location, but this requires a path update in a few files. See Appendix Installing SimpleSAMLphp in alternative locations for more details.

The only subdirectory of SimpleSAMLphp that needs to be accessible from the web is public . There are several ways of exposing SimpleSAMLphp depending on the way web sites are structured on your Nginx web server. The following is just one possible configuration.

Find the Nginx configuration file for the virtual hosts where you want to run SimpleSAMLphp. The configuration may look like this: 

server {
    listen 443 ssl;
    server_name idp.example.com;
    index index.php;

    ssl_certificate        /etc/pki/tls/certs/idp.example.com.crt;
    ssl_certificate_key    /etc/pki/tls/private/idp.example.com.key;
    ssl_protocols          TLSv1.3 TLSv1.2;
    ssl_ciphers            EECDH+AESGCM:EDH+AESGCM;

    location ^~ /simplesaml {
        alias /var/simplesamlphp/public;

        location ~^(?<prefix>/simplesaml)(?<phpfile>.+?\.php)(?<pathinfo>/.*)?$ {
            include          fastcgi_params;
            fastcgi_pass     $fastcgi_pass;
            fastcgi_param SCRIPT_FILENAME $document_root$phpfile;

            # Must be prepended with the baseurlpath
            fastcgi_param SCRIPT_NAME /simplesaml$phpfile;

            fastcgi_param PATH_INFO $pathinfo if_not_empty;
        }
    }
}

SimpleSAMLphp configuration: config.php

There are a few steps that you should complete in the main configuration file, config.php , right away: 

'baseurlpath' => 'https://your.canonical.host.name/simplesaml/',

Please note that your canonical URL should always use HTTPS in order to protect your users. Additionally, if you
are running behind a **reverse proxy** and you are offloading TLS to it, the proper way to tell SimpleSAMLphp that
its base URL should use HTTPS is to set the `baseurlpath` configuration option properly. SimpleSAMLphp deliberately
**ignores** the `X-Forwarded-*` set of headers that your proxy might be setting, so **do not rely on those**.

'auth.adminpassword' => 'setnewpasswordhere',

tr -c -d '0123456789abcdefghijklmnopqrstuvwxyz' </dev/urandom | dd bs=32 count=1 2>/dev/null;echo

Here is an example of the configuration option: 

'secretsalt' => 'randombytesinsertedhere',

Please note that changing the secret salt may break access to services for your users . 

'technicalcontact_name' => 'John Smith',
'technicalcontact_email' => 'john.smith@example.com',

'language.default' => 'no',

'timezone' => 'Europe/Oslo',

You can see a list of Supported Timezones at php.net .

Configuring PHP

Sending e-mails from PHP

Some parts of SimpleSAMLphp will allow you to send e-mails. For example, sending error reports to the technical admin. If you want to make use of this functionality, you should make sure your PHP installation is configured to be able to send e-mails.

By default SimpleSAMLphp uses the PHP mail() function, which you can configure via php.ini . For more advanced configuration, including using a remote SMTP server, see the mail.* options in config.php .

Enabling and disabling modules

If you want to enable some of the modules that are installed with SimpleSAMLphp, but are disabled by default, you can do that in the configuration: 

'module.enable' => [
    'exampleauth' => true, // Setting to TRUE enables.
    'saml' => false, // Setting to FALSE disables.
    'core' => null, // Unset or NULL uses default for this module.
],

Set to true the modules you want to enable, and to false those that you want to disable.

Prior to SSP V2 you could enable or disable modules by setting empty files with names ( enable , disable , default-enable ) in the module's root directory. You need to now use the module.enable config option.

The SimpleSAMLphp admin interface

After installing SimpleSAMLphp, you can access the homepage of your installation, which by default does not show much information:

https://service.example.org/simplesaml/

The exact URL depends on how you set it up with your web server, and of course on your hostname. If this works, you can now also acceas the admin module by adding admin/ to your base URL:

https://service.example.org/simplesaml/admin/

Warning : before you can actually use SimpleSAMLphp for something useful, you need to configure it either as a Service Provider or as an Identity Provider, depending on your use case.

Here is an example screenshot of what the SimpleSAMLphp page looks like:

Screenshot of the SimpleSAMLphp installation page.

Check your PHP environment

At the bottom of the admin page there are some green lights. SimpleSAMLphp runs some tests to see whether the required and recommended prerequisites are met. If any of the lights are red, you may have to install some PHP extensions or external PHP packages (e.g. you need the PHP LDAP extension to use the LDAP authentication module).

Next steps

You have now successfully installed SimpleSAMLphp, and the next steps depend on whether you want to setup a Service Provider (in order to protect access to an existing application) or an Identity Provider (which you would connect to a user database where your users can authenticate). Documentation on bridging between federation protocols is found in a separate document.

Support

If you need help to make this work, or want to discuss SimpleSAMLphp with other users of the software, you are in luck: there is a great Open Source community around SimpleSAMLphp, and you are welcome to join! The forums are open for you to ask questions, help others by answering their questions, request improvements or contribute with code or plugins of your own.

Appendix: Installing SimpleSAMLphp in alternative locations

There may be several reasons why you want to install SimpleSAMLphp in an alternative way.

The SimpleSAMLphp package contains one folder named simplesamlphp-x.y.z (where x.y.z is the version number). In this folder there are a lot of subfolders for library, metadata, configuration, etc. One of these folders is named public . Only this folder should be exposed on the web . The recommended configuration is to put the whole simplesamlphp folder outside the web root, and then link to the public folder by using the Alias directive, as described in the section called “Configuring Apache” . This is not the only possible way, though.

As an example, let's see how you can install SimpleSAMLphp in your home directory on a shared hosting server.

  1. Extract the SimpleSAMLphp archive in your home directory: 

    cd ~
tar xzf simplesamlphp-1.x.y.tar.gz
mv simplesamlphp-1.x.y simplesamlphp

  2. Then you can try to make a symlink into the public_html directory. 

    cd ~/public_html
ln -s ../simplesamlphp/public simplesaml

  3. Next, you need to set the baseurlpath configuration option with the URL pointing to the simplesaml link you just created in your public_html directory. For example, if your home directory is reachable in https://host.example/~myaccount/ , set the base URL path accordingly: 

    'baseurlpath' => 'https://host.example/~myaccount/simplesaml/',

    Now, you can go to the URL of your installation and check if things work:

    https://host.example/~myaccount/simplesaml/

Tip

Symlinking may fail, because some Apache configurations do not allow you to link to files from outside the public_html folder. If so, you can move the public folder instead of symlinking it: 

cd ~/public_html
mv ../simplesamlphp/public simplesaml

Now you have the following directory structure.

Now, we need to make a few configuration changes. First, let's edit ~/public_html/simplesaml/_include.php :

Change the two lines from: 

require_once(dirname(_FILE__, 2) . '/lib/_autoload.php');

to something like: 

require_once(dirname(__FILE__, 3) . '/lib/_autoload.php');

Warning : note that this will make upgrading SimpleSAMLphp much more difficult, since you will need to move the public directory and manually edit files every time you upgrade. It is also possible that this method does not work in future versions of SimpleSAMLphp, and therefore it is discouraged and should be used only as a last resort.