Fixes #8584, #8654, #8727 - fixes and improvements for saml (#8795)

* Let onelogin/php-saml know to use 'X-Forwarded-*' headers if it is from a trusted proxy

* Gracefully handle the case where openssl_csr_new fails when openssl.cnf is invalid/missing

* Improve ui of saml sp metadata by displaying it's url and a download button

app/Http/Controllers/Auth/SamlController.php

@@ -54,7 +54,9 @@ class SamlController extends Controller
             return response()->view('errors.403', [], 403);
         }
     
-        return response($metadata)->header('Content-Type', 'text/xml');
+        return response()->streamDownload(function () use ($metadata) {
+            echo $metadata;
+        }, 'snipe-it-metadata.xml', ['Content-Type' => 'text/xml']);
     }
 
     /**

app/Http/Requests/SettingsSamlRequest.php

@@ -71,6 +71,8 @@ class SettingsSamlRequest extends FormRequest
                 
                 $csr = openssl_csr_new($dn, $pkey, ['digest_alg' => 'sha256']);
 
+                if ($csr) {
+
                     $x509 = openssl_csr_sign($csr, null, $pkey, 3650, ['digest_alg' => 'sha256']);
 
                     openssl_x509_export($x509, $x509cert);
@@ -87,6 +89,9 @@ class SettingsSamlRequest extends FormRequest
                             'saml_sp_privatekey' => $privateKey,
                         ]);
                     }
+                } else {
+                    $validator->errors()->add('saml_integration', 'openssl.cnf is missing/invalid');
+                }
             }
 
             if (!empty($this->input('saml_custom_settings'))) {

app/Services/Saml.php

@@ -5,6 +5,7 @@ namespace App\Services;
 use OneLogin\Saml2\Auth as OneLogin_Saml2_Auth;
 use OneLogin\Saml2\IdPMetadataParser as OneLogin_Saml2_IdPMetadataParser;
 use OneLogin\Saml2\Settings as OneLogin_Saml2_Settings;
+use OneLogin\Saml2\Utils as OneLogin_Saml2_Utils;
 use App\Models\Setting;
 use App\Models\User;
 use Exception;
@@ -153,6 +154,9 @@ class Saml
         $this->_enabled = $setting->saml_enabled == '1';
 
         if ($this->isEnabled()) {
+            //Let onelogin/php-saml know to use 'X-Forwarded-*' headers if it is from a trusted proxy
+            OneLogin_Saml2_Utils::setProxyVars(request()->isFromTrustedProxy());
+
             data_set($settings, 'sp.entityId', url('/'));
             data_set($settings, 'sp.assertionConsumerService.url', route('saml.acs'));
             data_set($settings, 'sp.singleLogoutService.url', route('saml.sls'));

resources/lang/en/admin/settings/general.php

@@ -125,6 +125,7 @@ return array(
     'saml_sp_acs_url'           => 'Assertion Consumer Service (ACS) URL',
     'saml_sp_sls_url'           => 'Single Logout Service (SLS) URL',
     'saml_sp_x509cert'          => 'Public Certificate',
+    'saml_sp_metadata_url'      => 'Metadata URL',
     'saml_idp_metadata'         => 'SAML IdP Metadata',
     'saml_idp_metadata_help'    => 'You can specify the IdP metadata using a URL or XML file.',
     'saml_attr_mapping_username' => 'Attribute Mapping - Username',

resources/views/settings/saml.blade.php

@@ -55,6 +55,7 @@
 
                                 {{ Form::checkbox('saml_enabled', '1', Request::old('saml_enabled', $setting->saml_enabled), [((config('app.lock_passwords')===true)) ? 'disabled ': '', 'class' => 'minimal '. $setting->demoMode, $setting->demoMode]) }}
                                 {{ trans('admin/settings/general.saml_enabled') }}
+                                {!! $errors->first('saml_integration', '<span class="alert-msg" aria-hidden="true">:message</span>') !!}<br>
                                 @if (config('app.lock_passwords')===true)
                                 <p class="text-warning"><i class="fa fa-lock"></i> {{ trans('general.feature_disabled') }}</p>
                                 @endif
@@ -82,8 +83,12 @@
                                         {{ Form::textarea('saml_sp_x509cert', $setting->saml_sp_x509cert, ['class' => 'form-control', 'wrap' => 'off', 'readonly']) }}
                                         <br>
                                     @endif
+                                    <!-- SAML SP Metadata URL -->
+                                    {{ Form::label('saml_sp_metadata_url', trans('admin/settings/general.saml_sp_metadata_url')) }}
+                                    {{ Form::text('saml_sp_metadata_url', route('saml.metadata'), ['class' => 'form-control', 'readonly']) }}
+                                    <br>
                                     <p class="help-block">
-                                        <a href="{{ route('saml.metadata') }}" target="_blank" class="btn btn-default" style="margin-right: 5px;">View Metadata</a>
+                                        <a href="{{ route('saml.metadata') }}" target="_blank" class="btn btn-default" style="margin-right: 5px;">Download Metadata</a>
                                     </p>
                                 @endif
                                 {!! $errors->first('saml_enabled', '<span class="alert-msg" aria-hidden="true">:message</span>') !!}