From 0b02a6d123b2014705998c94ddf3d460948d3eac Mon Sep 17 00:00:00 2001
From: redmatrix <git@macgirvin.com>
Date: Tue, 10 May 2016 17:26:44 -0700
Subject: initial sabre upgrade (needs lots of work - to wit: authentication,
 redo the browser interface, and rework event export/import)

---
 vendor/sabre/http/lib/Auth/Digest.php | 231 ++++++++++++++++++++++++++++++++++
 1 file changed, 231 insertions(+)
 create mode 100644 vendor/sabre/http/lib/Auth/Digest.php

(limited to 'vendor/sabre/http/lib/Auth/Digest.php')

diff --git a/vendor/sabre/http/lib/Auth/Digest.php b/vendor/sabre/http/lib/Auth/Digest.php
new file mode 100644
index 000000000..4b3f0746f
--- /dev/null
+++ b/vendor/sabre/http/lib/Auth/Digest.php
@@ -0,0 +1,231 @@
+<?php
+
+namespace Sabre\HTTP\Auth;
+
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * HTTP Digest Authentication handler
+ *
+ * Use this class for easy http digest authentication.
+ * Instructions:
+ *
+ *  1. Create the object
+ *  2. Call the setRealm() method with the realm you plan to use
+ *  3. Call the init method function.
+ *  4. Call the getUserName() function. This function may return null if no
+ *     authentication information was supplied. Based on the username you
+ *     should check your internal database for either the associated password,
+ *     or the so-called A1 hash of the digest.
+ *  5. Call either validatePassword() or validateA1(). This will return true
+ *     or false.
+ *  6. To make sure an authentication prompt is displayed, call the
+ *     requireLogin() method.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Digest extends AbstractAuth {
+
+    /**
+     * These constants are used in setQOP();
+     */
+    const QOP_AUTH = 1;
+    const QOP_AUTHINT = 2;
+
+    protected $nonce;
+    protected $opaque;
+    protected $digestParts;
+    protected $A1;
+    protected $qop = self::QOP_AUTH;
+
+    /**
+     * Initializes the object
+     */
+    function __construct($realm = 'SabreTooth', RequestInterface $request, ResponseInterface $response) {
+
+        $this->nonce = uniqid();
+        $this->opaque = md5($realm);
+        parent::__construct($realm, $request, $response);
+
+    }
+
+    /**
+     * Gathers all information from the headers
+     *
+     * This method needs to be called prior to anything else.
+     *
+     * @return void
+     */
+    function init() {
+
+        $digest = $this->getDigest();
+        $this->digestParts = $this->parseDigest($digest);
+
+    }
+
+    /**
+     * Sets the quality of protection value.
+     *
+     * Possible values are:
+     *   Sabre\HTTP\DigestAuth::QOP_AUTH
+     *   Sabre\HTTP\DigestAuth::QOP_AUTHINT
+     *
+     * Multiple values can be specified using logical OR.
+     *
+     * QOP_AUTHINT ensures integrity of the request body, but this is not
+     * supported by most HTTP clients. QOP_AUTHINT also requires the entire
+     * request body to be md5'ed, which can put strains on CPU and memory.
+     *
+     * @param int $qop
+     * @return void
+     */
+    function setQOP($qop) {
+
+        $this->qop = $qop;
+
+    }
+
+    /**
+     * Validates the user.
+     *
+     * The A1 parameter should be md5($username . ':' . $realm . ':' . $password);
+     *
+     * @param string $A1
+     * @return bool
+     */
+    function validateA1($A1) {
+
+        $this->A1 = $A1;
+        return $this->validate();
+
+    }
+
+    /**
+     * Validates authentication through a password. The actual password must be provided here.
+     * It is strongly recommended not store the password in plain-text and use validateA1 instead.
+     *
+     * @param string $password
+     * @return bool
+     */
+    function validatePassword($password) {
+
+        $this->A1 = md5($this->digestParts['username'] . ':' . $this->realm . ':' . $password);
+        return $this->validate();
+
+    }
+
+    /**
+     * Returns the username for the request
+     *
+     * @return string
+     */
+    function getUsername() {
+
+        return $this->digestParts['username'];
+
+    }
+
+    /**
+     * Validates the digest challenge
+     *
+     * @return bool
+     */
+    protected function validate() {
+
+        $A2 = $this->request->getMethod() . ':' . $this->digestParts['uri'];
+
+        if ($this->digestParts['qop'] == 'auth-int') {
+            // Making sure we support this qop value
+            if (!($this->qop & self::QOP_AUTHINT)) return false;
+            // We need to add an md5 of the entire request body to the A2 part of the hash
+            $body = $this->request->getBody($asString = true);
+            $this->request->setBody($body);
+            $A2 .= ':' . md5($body);
+        } else {
+
+            // We need to make sure we support this qop value
+            if (!($this->qop & self::QOP_AUTH)) return false;
+        }
+
+        $A2 = md5($A2);
+
+        $validResponse = md5("{$this->A1}:{$this->digestParts['nonce']}:{$this->digestParts['nc']}:{$this->digestParts['cnonce']}:{$this->digestParts['qop']}:{$A2}");
+
+        return $this->digestParts['response'] == $validResponse;
+
+
+    }
+
+    /**
+     * Returns an HTTP 401 header, forcing login
+     *
+     * This should be called when username and password are incorrect, or not supplied at all
+     *
+     * @return void
+     */
+    function requireLogin() {
+
+        $qop = '';
+        switch ($this->qop) {
+            case self::QOP_AUTH    :
+                $qop = 'auth';
+                break;
+            case self::QOP_AUTHINT :
+                $qop = 'auth-int';
+                break;
+            case self::QOP_AUTH | self::QOP_AUTHINT :
+                $qop = 'auth,auth-int';
+                break;
+        }
+
+        $this->response->addHeader('WWW-Authenticate', 'Digest realm="' . $this->realm . '",qop="' . $qop . '",nonce="' . $this->nonce . '",opaque="' . $this->opaque . '"');
+        $this->response->setStatus(401);
+
+    }
+
+
+    /**
+     * This method returns the full digest string.
+     *
+     * It should be compatibile with mod_php format and other webservers.
+     *
+     * If the header could not be found, null will be returned
+     *
+     * @return mixed
+     */
+    function getDigest() {
+
+        return $this->request->getHeader('Authorization');
+
+    }
+
+
+    /**
+     * Parses the different pieces of the digest string into an array.
+     *
+     * This method returns false if an incomplete digest was supplied
+     *
+     * @param string $digest
+     * @return mixed
+     */
+    protected function parseDigest($digest) {
+
+        // protect against missing data
+        $needed_parts = ['nonce' => 1, 'nc' => 1, 'cnonce' => 1, 'qop' => 1, 'username' => 1, 'uri' => 1, 'response' => 1];
+        $data = [];
+
+        preg_match_all('@(\w+)=(?:(?:")([^"]+)"|([^\s,$]+))@', $digest, $matches, PREG_SET_ORDER);
+
+        foreach ($matches as $m) {
+            $data[$m[1]] = $m[2] ? $m[2] : $m[3];
+            unset($needed_parts[$m[1]]);
+        }
+
+        return $needed_parts ? false : $data;
+
+    }
+
+}
-- 
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