Generate QR codes for TOTP tokens

Summary: Ref T4398. I found a reasonable-ish LGPLv3 library for doing this, which isn't too huge or unwieldy.

Test Plan:
  - Scanned QR code with Authy.
  - Scanned QR code with Google Authenticator.

{F149317}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4398

Differential Revision: https://secure.phabricator.com/D8923

externals/phpqrcode/LICENSE

@@ -0,0 +1,165 @@
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.

externals/phpqrcode/README

@@ -0,0 +1,45 @@
+This is PHP implementation of QR Code 2-D barcode generator. It is pure-php
+LGPL-licensed implementation based on C libqrencode by Kentaro Fukuchi.
+
+== LICENSING ==
+
+Copyright (C) 2010 by Dominik Dzienia 
+
+This library is free software; you can redistribute it and/or modify it under
+the terms of the GNU Lesser General Public License as published by the Free
+Software Foundation; either version 3 of the License, or any later version.
+
+This library is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU Lesser General Public License (LICENSE file)
+for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this library; if not, write to the Free Software Foundation, Inc., 51
+Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+== INSTALATION AND USAGE ==
+
+ * INSTALL file
+ * http://sourceforge.net/apps/mediawiki/phpqrcode/index.php?title=Main_Page
+
+== CONTACT ==
+
+Fell free to contact me via e-mail (deltalab at poczta dot fm) or using
+folowing project pages:
+
+ * http://sourceforge.net/projects/phpqrcode/
+ * http://phpqrcode.sourceforge.net/
+  
+== ACKNOWLEDGMENTS ==
+
+Based on C libqrencode library (ver. 3.1.1) 
+Copyright (C) 2006-2010 by Kentaro Fukuchi
+http://megaui.net/fukuchi/works/qrencode/index.en.html
+
+QR Code is registered trademarks of DENSO WAVE INCORPORATED in JAPAN and other
+countries.
+
+Reed-Solomon code encoder is written by Phil Karn, KA9Q.
+Copyright (C) 2002, 2003, 2004, 2006 Phil Karn, KA9Q
+ 

externals/phpqrcode/VERSION

@@ -0,0 +1,2 @@
+1.1.4
+2010100721

src/applications/auth/factor/PhabricatorAuthFactorTOTP.php

@@ -22,7 +22,6 @@ final class PhabricatorAuthFactorTOTP extends PhabricatorAuthFactor {
     AphrontRequest $request,
     PhabricatorUser $user) {
 
-
     $key = $request->getStr('totpkey');
     if (!strlen($key)) {
       // TODO: When the user submits a key, we should require that it be
@@ -69,8 +68,21 @@ final class PhabricatorAuthFactorTOTP extends PhabricatorAuthFactor {
     $form->appendInstructions(
       pht(
         'Launch the application on your phone, and add a new entry for '.
-        'this Phabricator install. When prompted, enter the key shown '.
-        'below into the application.'));
+        'this Phabricator install. When prompted, scan the QR code or '.
+        'manually enter the key shown below into the application.'));
+
+    $prod_uri = new PhutilURI(PhabricatorEnv::getProductionURI('/'));
+    $issuer = $prod_uri->getDomain();
+
+    $uri = urisprintf(
+      'otpauth://totp/%s:%s?secret=%s&issuer=%s',
+      $issuer,
+      $user->getUsername(),
+      $key,
+      $issuer);
+
+    $qrcode = $this->renderQRCode($uri);
+    $form->appendChild($qrcode);
 
     $form->appendChild(
       id(new AphrontFormStaticControl())
@@ -219,4 +231,47 @@ final class PhabricatorAuthFactorTOTP extends PhabricatorAuthFactor {
     return $code;
   }
 
+
+  /**
+   * @phutil-external-symbol class QRcode
+   */
+  private function renderQRCode($uri) {
+    $root = dirname(phutil_get_library_root('phabricator'));
+    require_once $root.'/externals/phpqrcode/phpqrcode.php';
+
+    $lines = QRcode::text($uri);
+
+    $total_width = 240;
+    $cell_size = floor($total_width / count($lines));
+
+    $rows = array();
+    foreach ($lines as $line) {
+      $cells = array();
+      for ($ii = 0; $ii < strlen($line); $ii++) {
+        if ($line[$ii] == '1') {
+          $color = '#000';
+        } else {
+          $color = '#fff';
+        }
+
+        $cells[] = phutil_tag(
+          'td',
+          array(
+            'width' => $cell_size,
+            'height' => $cell_size,
+            'style' => 'background: '.$color,
+          ),
+          '');
+      }
+      $rows[] = phutil_tag('tr', array(), $cells);
+    }
+
+    return phutil_tag(
+      'table',
+      array(
+        'style' => 'margin: 24px auto;',
+      ),
+      $rows);
+  }
+
 }