diff options
Diffstat (limited to 'calendar/lib/SabreDAV/lib/OldSabre/HTTP/AWSAuth.php')
| -rw-r--r-- | calendar/lib/SabreDAV/lib/OldSabre/HTTP/AWSAuth.php | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/calendar/lib/SabreDAV/lib/OldSabre/HTTP/AWSAuth.php b/calendar/lib/SabreDAV/lib/OldSabre/HTTP/AWSAuth.php new file mode 100644 index 0000000..f080983 --- /dev/null +++ b/calendar/lib/SabreDAV/lib/OldSabre/HTTP/AWSAuth.php @@ -0,0 +1,227 @@ +<?php + +namespace OldSabre\HTTP; + +/** + * HTTP AWS Authentication handler + * + * Use this class to leverage amazon's AWS authentication header + * + * @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/). + * @author Evert Pot (http://evertpot.com/) + * @license http://sabre.io/license/ Modified BSD License + */ +class AWSAuth extends AbstractAuth { + + /** + * The signature supplied by the HTTP client + * + * @var string + */ + private $signature = null; + + /** + * The accesskey supplied by the HTTP client + * + * @var string + */ + private $accessKey = null; + + /** + * An error code, if any + * + * This value will be filled with one of the ERR_* constants + * + * @var int + */ + public $errorCode = 0; + + const ERR_NOAWSHEADER = 1; + const ERR_MD5CHECKSUMWRONG = 2; + const ERR_INVALIDDATEFORMAT = 3; + const ERR_REQUESTTIMESKEWED = 4; + const ERR_INVALIDSIGNATURE = 5; + + /** + * Gathers all information from the headers + * + * This method needs to be called prior to anything else. + * + * @return bool + */ + public function init() { + + $authHeader = $this->httpRequest->getHeader('Authorization'); + $authHeader = explode(' ',$authHeader); + + if ($authHeader[0]!='AWS' || !isset($authHeader[1])) { + $this->errorCode = self::ERR_NOAWSHEADER; + return false; + } + + list($this->accessKey,$this->signature) = explode(':',$authHeader[1]); + + return true; + + } + + /** + * Returns the username for the request + * + * @return string + */ + public function getAccessKey() { + + return $this->accessKey; + + } + + /** + * Validates the signature based on the secretKey + * + * @param string $secretKey + * @return bool + */ + public function validate($secretKey) { + + $contentMD5 = $this->httpRequest->getHeader('Content-MD5'); + + if ($contentMD5) { + // We need to validate the integrity of the request + $body = $this->httpRequest->getBody(true); + $this->httpRequest->setBody($body,true); + + if ($contentMD5!=base64_encode(md5($body,true))) { + // content-md5 header did not match md5 signature of body + $this->errorCode = self::ERR_MD5CHECKSUMWRONG; + return false; + } + + } + + if (!$requestDate = $this->httpRequest->getHeader('x-amz-date')) + $requestDate = $this->httpRequest->getHeader('Date'); + + if (!$this->validateRFC2616Date($requestDate)) + return false; + + $amzHeaders = $this->getAmzHeaders(); + + $signature = base64_encode( + $this->hmacsha1($secretKey, + $this->httpRequest->getMethod() . "\n" . + $contentMD5 . "\n" . + $this->httpRequest->getHeader('Content-type') . "\n" . + $requestDate . "\n" . + $amzHeaders . + $this->httpRequest->getURI() + ) + ); + + if ($this->signature != $signature) { + + $this->errorCode = self::ERR_INVALIDSIGNATURE; + return false; + + } + + return true; + + } + + + /** + * Returns an HTTP 401 header, forcing login + * + * This should be called when username and password are incorrect, or not supplied at all + * + * @return void + */ + public function requireLogin() { + + $this->httpResponse->setHeader('WWW-Authenticate','AWS'); + $this->httpResponse->sendStatus(401); + + } + + /** + * Makes sure the supplied value is a valid RFC2616 date. + * + * If we would just use strtotime to get a valid timestamp, we have no way of checking if a + * user just supplied the word 'now' for the date header. + * + * This function also makes sure the Date header is within 15 minutes of the operating + * system date, to prevent replay attacks. + * + * @param string $dateHeader + * @return bool + */ + protected function validateRFC2616Date($dateHeader) { + + $date = Util::parseHTTPDate($dateHeader); + + // Unknown format + if (!$date) { + $this->errorCode = self::ERR_INVALIDDATEFORMAT; + return false; + } + + $min = new \DateTime('-15 minutes'); + $max = new \DateTime('+15 minutes'); + + // We allow 15 minutes around the current date/time + if ($date > $max || $date < $min) { + $this->errorCode = self::ERR_REQUESTTIMESKEWED; + return false; + } + + return $date; + + } + + /** + * Returns a list of AMZ headers + * + * @return string + */ + protected function getAmzHeaders() { + + $amzHeaders = array(); + $headers = $this->httpRequest->getHeaders(); + foreach($headers as $headerName => $headerValue) { + if (strpos(strtolower($headerName),'x-amz-')===0) { + $amzHeaders[strtolower($headerName)] = str_replace(array("\r\n"),array(' '),$headerValue) . "\n"; + } + } + ksort($amzHeaders); + + $headerStr = ''; + foreach($amzHeaders as $h=>$v) { + $headerStr.=$h.':'.$v; + } + + return $headerStr; + + } + + /** + * Generates an HMAC-SHA1 signature + * + * @param string $key + * @param string $message + * @return string + */ + private function hmacsha1($key, $message) { + + $blocksize=64; + if (strlen($key)>$blocksize) + $key=pack('H*', sha1($key)); + $key=str_pad($key,$blocksize,chr(0x00)); + $ipad=str_repeat(chr(0x36),$blocksize); + $opad=str_repeat(chr(0x5c),$blocksize); + $hmac = pack('H*',sha1(($key^$opad).pack('H*',sha1(($key^$ipad).$message)))); + return $hmac; + + } + +} |