683 lines
17 KiB
PHP
683 lines
17 KiB
PHP
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<?php
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/*
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* This file is part of SwiftMailer.
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* (c) 2004-2009 Chris Corbyn
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* DKIM Signer used to apply DKIM Signature to a message.
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*
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* @author Xavier De Cock <xdecock@gmail.com>
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*/
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class Swift_Signers_DKIMSigner implements Swift_Signers_HeaderSigner
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{
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/**
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* PrivateKey.
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*
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* @var string
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*/
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protected $privateKey;
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/**
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* DomainName.
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*
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* @var string
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*/
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protected $domainName;
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/**
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* Selector.
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*
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* @var string
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*/
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protected $selector;
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private $passphrase = '';
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/**
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* Hash algorithm used.
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*
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* @see RFC6376 3.3: Signers MUST implement and SHOULD sign using rsa-sha256.
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*
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* @var string
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*/
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protected $hashAlgorithm = 'rsa-sha256';
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/**
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* Body canon method.
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*
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* @var string
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*/
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protected $bodyCanon = 'simple';
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/**
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* Header canon method.
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*
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* @var string
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*/
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protected $headerCanon = 'simple';
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/**
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* Headers not being signed.
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*
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* @var array
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*/
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protected $ignoredHeaders = ['return-path' => true];
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/**
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* Signer identity.
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*
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* @var string
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*/
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protected $signerIdentity;
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/**
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* BodyLength.
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*
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* @var int
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*/
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protected $bodyLen = 0;
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/**
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* Maximum signedLen.
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*
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* @var int
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*/
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protected $maxLen = PHP_INT_MAX;
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/**
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* Embbed bodyLen in signature.
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*
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* @var bool
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*/
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protected $showLen = false;
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/**
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* When the signature has been applied (true means time()), false means not embedded.
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*
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* @var mixed
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*/
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protected $signatureTimestamp = true;
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/**
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* When will the signature expires false means not embedded, if sigTimestamp is auto
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* Expiration is relative, otherwise it's absolute.
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*
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* @var int
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*/
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protected $signatureExpiration = false;
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/**
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* Must we embed signed headers?
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*
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* @var bool
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*/
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protected $debugHeaders = false;
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// work variables
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/**
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* Headers used to generate hash.
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*
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* @var array
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*/
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protected $signedHeaders = [];
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/**
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* If debugHeaders is set store debugData here.
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*
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* @var string[]
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*/
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private $debugHeadersData = [];
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/**
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* Stores the bodyHash.
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*
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* @var string
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*/
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private $bodyHash = '';
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/**
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* Stores the signature header.
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*
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* @var Swift_Mime_Headers_ParameterizedHeader
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*/
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protected $dkimHeader;
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private $bodyHashHandler;
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private $headerHash;
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private $headerCanonData = '';
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private $bodyCanonEmptyCounter = 0;
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private $bodyCanonIgnoreStart = 2;
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private $bodyCanonSpace = false;
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private $bodyCanonLastChar = null;
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private $bodyCanonLine = '';
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private $bound = [];
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/**
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* Constructor.
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*
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* @param string $privateKey
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* @param string $domainName
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* @param string $selector
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* @param string $passphrase
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*/
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public function __construct($privateKey, $domainName, $selector, $passphrase = '')
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{
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$this->privateKey = $privateKey;
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$this->domainName = $domainName;
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$this->signerIdentity = '@'.$domainName;
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$this->selector = $selector;
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$this->passphrase = $passphrase;
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}
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/**
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* Reset the Signer.
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*
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* @see Swift_Signer::reset()
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*/
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public function reset()
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{
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$this->headerHash = null;
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$this->signedHeaders = [];
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$this->bodyHash = null;
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$this->bodyHashHandler = null;
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$this->bodyCanonIgnoreStart = 2;
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$this->bodyCanonEmptyCounter = 0;
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$this->bodyCanonLastChar = null;
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$this->bodyCanonSpace = false;
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}
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/**
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* Writes $bytes to the end of the stream.
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*
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* Writing may not happen immediately if the stream chooses to buffer. If
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* you want to write these bytes with immediate effect, call {@link commit()}
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* after calling write().
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*
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* This method returns the sequence ID of the write (i.e. 1 for first, 2 for
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* second, etc etc).
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*
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* @param string $bytes
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*
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* @return int
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*
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* @throws Swift_IoException
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*/
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// TODO fix return
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public function write($bytes)
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{
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$this->canonicalizeBody($bytes);
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foreach ($this->bound as $is) {
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$is->write($bytes);
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}
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}
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/**
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* For any bytes that are currently buffered inside the stream, force them
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* off the buffer.
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*/
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public function commit()
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{
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// Nothing to do
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return;
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}
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/**
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* Attach $is to this stream.
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*
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* The stream acts as an observer, receiving all data that is written.
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* All {@link write()} and {@link flushBuffers()} operations will be mirrored.
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*/
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public function bind(Swift_InputByteStream $is)
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{
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// Don't have to mirror anything
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$this->bound[] = $is;
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return;
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}
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/**
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* Remove an already bound stream.
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*
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* If $is is not bound, no errors will be raised.
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* If the stream currently has any buffered data it will be written to $is
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* before unbinding occurs.
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*/
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public function unbind(Swift_InputByteStream $is)
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{
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// Don't have to mirror anything
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foreach ($this->bound as $k => $stream) {
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if ($stream === $is) {
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unset($this->bound[$k]);
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return;
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}
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}
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}
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/**
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* Flush the contents of the stream (empty it) and set the internal pointer
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* to the beginning.
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*
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* @throws Swift_IoException
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*/
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public function flushBuffers()
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{
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$this->reset();
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}
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/**
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* Set hash_algorithm, must be one of rsa-sha256 | rsa-sha1.
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*
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* @param string $hash 'rsa-sha1' or 'rsa-sha256'
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*
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* @throws Swift_SwiftException
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*
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* @return $this
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*/
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public function setHashAlgorithm($hash)
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{
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switch ($hash) {
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case 'rsa-sha1':
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$this->hashAlgorithm = 'rsa-sha1';
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break;
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case 'rsa-sha256':
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$this->hashAlgorithm = 'rsa-sha256';
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if (!\defined('OPENSSL_ALGO_SHA256')) {
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throw new Swift_SwiftException('Unable to set sha256 as it is not supported by OpenSSL.');
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}
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break;
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default:
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throw new Swift_SwiftException('Unable to set the hash algorithm, must be one of rsa-sha1 or rsa-sha256 (%s given).', $hash);
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}
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return $this;
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}
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/**
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* Set the body canonicalization algorithm.
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*
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* @param string $canon
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*
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* @return $this
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*/
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public function setBodyCanon($canon)
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{
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if ('relaxed' == $canon) {
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$this->bodyCanon = 'relaxed';
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} else {
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$this->bodyCanon = 'simple';
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}
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return $this;
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}
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/**
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* Set the header canonicalization algorithm.
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*
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* @param string $canon
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*
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* @return $this
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*/
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public function setHeaderCanon($canon)
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{
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if ('relaxed' == $canon) {
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$this->headerCanon = 'relaxed';
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} else {
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$this->headerCanon = 'simple';
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}
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return $this;
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}
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/**
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* Set the signer identity.
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*
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* @param string $identity
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*
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* @return $this
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*/
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public function setSignerIdentity($identity)
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{
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$this->signerIdentity = $identity;
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return $this;
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}
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/**
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* Set the length of the body to sign.
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*
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* @param mixed $len (bool or int)
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*
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* @return $this
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*/
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public function setBodySignedLen($len)
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{
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if (true === $len) {
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$this->showLen = true;
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$this->maxLen = PHP_INT_MAX;
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} elseif (false === $len) {
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$this->showLen = false;
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$this->maxLen = PHP_INT_MAX;
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} else {
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$this->showLen = true;
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$this->maxLen = (int) $len;
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}
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return $this;
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}
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/**
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* Set the signature timestamp.
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*
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* @param int $time A timestamp
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*
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* @return $this
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*/
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public function setSignatureTimestamp($time)
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{
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$this->signatureTimestamp = $time;
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return $this;
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}
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/**
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* Set the signature expiration timestamp.
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*
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* @param int $time A timestamp
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*
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* @return $this
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*/
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public function setSignatureExpiration($time)
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{
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$this->signatureExpiration = $time;
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return $this;
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}
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/**
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* Enable / disable the DebugHeaders.
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*
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* @param bool $debug
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*
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* @return Swift_Signers_DKIMSigner
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*/
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public function setDebugHeaders($debug)
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{
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$this->debugHeaders = (bool) $debug;
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return $this;
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}
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/**
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* Start Body.
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*/
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public function startBody()
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{
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// Init
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switch ($this->hashAlgorithm) {
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case 'rsa-sha256':
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$this->bodyHashHandler = hash_init('sha256');
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break;
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case 'rsa-sha1':
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$this->bodyHashHandler = hash_init('sha1');
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break;
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}
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$this->bodyCanonLine = '';
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}
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/**
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* End Body.
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*/
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public function endBody()
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||
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{
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||
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$this->endOfBody();
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||
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}
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|
|
/**
|
||
|
|
* Returns the list of Headers Tampered by this plugin.
|
||
|
|
*
|
||
|
|
* @return array
|
||
|
|
*/
|
||
|
|
public function getAlteredHeaders()
|
||
|
|
{
|
||
|
|
if ($this->debugHeaders) {
|
||
|
|
return ['DKIM-Signature', 'X-DebugHash'];
|
||
|
|
} else {
|
||
|
|
return ['DKIM-Signature'];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Adds an ignored Header.
|
||
|
|
*
|
||
|
|
* @param string $header_name
|
||
|
|
*
|
||
|
|
* @return Swift_Signers_DKIMSigner
|
||
|
|
*/
|
||
|
|
public function ignoreHeader($header_name)
|
||
|
|
{
|
||
|
|
$this->ignoredHeaders[strtolower($header_name)] = true;
|
||
|
|
|
||
|
|
return $this;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Set the headers to sign.
|
||
|
|
*
|
||
|
|
* @return Swift_Signers_DKIMSigner
|
||
|
|
*/
|
||
|
|
public function setHeaders(Swift_Mime_SimpleHeaderSet $headers)
|
||
|
|
{
|
||
|
|
$this->headerCanonData = '';
|
||
|
|
// Loop through Headers
|
||
|
|
$listHeaders = $headers->listAll();
|
||
|
|
foreach ($listHeaders as $hName) {
|
||
|
|
// Check if we need to ignore Header
|
||
|
|
if (!isset($this->ignoredHeaders[strtolower($hName)])) {
|
||
|
|
if ($headers->has($hName)) {
|
||
|
|
$tmp = $headers->getAll($hName);
|
||
|
|
foreach ($tmp as $header) {
|
||
|
|
if ('' != $header->getFieldBody()) {
|
||
|
|
$this->addHeader($header->toString());
|
||
|
|
$this->signedHeaders[] = $header->getFieldName();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return $this;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Add the signature to the given Headers.
|
||
|
|
*
|
||
|
|
* @return Swift_Signers_DKIMSigner
|
||
|
|
*/
|
||
|
|
public function addSignature(Swift_Mime_SimpleHeaderSet $headers)
|
||
|
|
{
|
||
|
|
// Prepare the DKIM-Signature
|
||
|
|
$params = ['v' => '1', 'a' => $this->hashAlgorithm, 'bh' => base64_encode($this->bodyHash), 'd' => $this->domainName, 'h' => implode(': ', $this->signedHeaders), 'i' => $this->signerIdentity, 's' => $this->selector];
|
||
|
|
if ('simple' != $this->bodyCanon) {
|
||
|
|
$params['c'] = $this->headerCanon.'/'.$this->bodyCanon;
|
||
|
|
} elseif ('simple' != $this->headerCanon) {
|
||
|
|
$params['c'] = $this->headerCanon;
|
||
|
|
}
|
||
|
|
if ($this->showLen) {
|
||
|
|
$params['l'] = $this->bodyLen;
|
||
|
|
}
|
||
|
|
if (true === $this->signatureTimestamp) {
|
||
|
|
$params['t'] = time();
|
||
|
|
if (false !== $this->signatureExpiration) {
|
||
|
|
$params['x'] = $params['t'] + $this->signatureExpiration;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (false !== $this->signatureTimestamp) {
|
||
|
|
$params['t'] = $this->signatureTimestamp;
|
||
|
|
}
|
||
|
|
if (false !== $this->signatureExpiration) {
|
||
|
|
$params['x'] = $this->signatureExpiration;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ($this->debugHeaders) {
|
||
|
|
$params['z'] = implode('|', $this->debugHeadersData);
|
||
|
|
}
|
||
|
|
$string = '';
|
||
|
|
foreach ($params as $k => $v) {
|
||
|
|
$string .= $k.'='.$v.'; ';
|
||
|
|
}
|
||
|
|
$string = trim($string);
|
||
|
|
$headers->addTextHeader('DKIM-Signature', $string);
|
||
|
|
// Add the last DKIM-Signature
|
||
|
|
$tmp = $headers->getAll('DKIM-Signature');
|
||
|
|
$this->dkimHeader = end($tmp);
|
||
|
|
$this->addHeader(trim($this->dkimHeader->toString())."\r\n b=", true);
|
||
|
|
if ($this->debugHeaders) {
|
||
|
|
$headers->addTextHeader('X-DebugHash', base64_encode($this->headerHash));
|
||
|
|
}
|
||
|
|
$this->dkimHeader->setValue($string.' b='.trim(chunk_split(base64_encode($this->getEncryptedHash()), 73, ' ')));
|
||
|
|
|
||
|
|
return $this;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Private helpers */
|
||
|
|
|
||
|
|
protected function addHeader($header, $is_sig = false)
|
||
|
|
{
|
||
|
|
switch ($this->headerCanon) {
|
||
|
|
case 'relaxed':
|
||
|
|
// Prepare Header and cascade
|
||
|
|
$exploded = explode(':', $header, 2);
|
||
|
|
$name = strtolower(trim($exploded[0]));
|
||
|
|
$value = str_replace("\r\n", '', $exploded[1]);
|
||
|
|
$value = preg_replace("/[ \t][ \t]+/", ' ', $value);
|
||
|
|
$header = $name.':'.trim($value).($is_sig ? '' : "\r\n");
|
||
|
|
// no break
|
||
|
|
case 'simple':
|
||
|
|
// Nothing to do
|
||
|
|
}
|
||
|
|
$this->addToHeaderHash($header);
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function canonicalizeBody($string)
|
||
|
|
{
|
||
|
|
$len = \strlen($string);
|
||
|
|
$canon = '';
|
||
|
|
$method = ('relaxed' == $this->bodyCanon);
|
||
|
|
for ($i = 0; $i < $len; ++$i) {
|
||
|
|
if ($this->bodyCanonIgnoreStart > 0) {
|
||
|
|
--$this->bodyCanonIgnoreStart;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
switch ($string[$i]) {
|
||
|
|
case "\r":
|
||
|
|
$this->bodyCanonLastChar = "\r";
|
||
|
|
break;
|
||
|
|
case "\n":
|
||
|
|
if ("\r" == $this->bodyCanonLastChar) {
|
||
|
|
if ($method) {
|
||
|
|
$this->bodyCanonSpace = false;
|
||
|
|
}
|
||
|
|
if ('' == $this->bodyCanonLine) {
|
||
|
|
++$this->bodyCanonEmptyCounter;
|
||
|
|
} else {
|
||
|
|
$this->bodyCanonLine = '';
|
||
|
|
$canon .= "\r\n";
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
// Wooops Error
|
||
|
|
// todo handle it but should never happen
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case ' ':
|
||
|
|
case "\t":
|
||
|
|
if ($method) {
|
||
|
|
$this->bodyCanonSpace = true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
// no break
|
||
|
|
default:
|
||
|
|
if ($this->bodyCanonEmptyCounter > 0) {
|
||
|
|
$canon .= str_repeat("\r\n", $this->bodyCanonEmptyCounter);
|
||
|
|
$this->bodyCanonEmptyCounter = 0;
|
||
|
|
}
|
||
|
|
if ($this->bodyCanonSpace) {
|
||
|
|
$this->bodyCanonLine .= ' ';
|
||
|
|
$canon .= ' ';
|
||
|
|
$this->bodyCanonSpace = false;
|
||
|
|
}
|
||
|
|
$this->bodyCanonLine .= $string[$i];
|
||
|
|
$canon .= $string[$i];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$this->addToBodyHash($canon);
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function endOfBody()
|
||
|
|
{
|
||
|
|
// Add trailing Line return if last line is non empty
|
||
|
|
if (\strlen($this->bodyCanonLine) > 0) {
|
||
|
|
$this->addToBodyHash("\r\n");
|
||
|
|
}
|
||
|
|
$this->bodyHash = hash_final($this->bodyHashHandler, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
private function addToBodyHash($string)
|
||
|
|
{
|
||
|
|
$len = \strlen($string);
|
||
|
|
if ($len > ($new_len = ($this->maxLen - $this->bodyLen))) {
|
||
|
|
$string = substr($string, 0, $new_len);
|
||
|
|
$len = $new_len;
|
||
|
|
}
|
||
|
|
hash_update($this->bodyHashHandler, $string);
|
||
|
|
$this->bodyLen += $len;
|
||
|
|
}
|
||
|
|
|
||
|
|
private function addToHeaderHash($header)
|
||
|
|
{
|
||
|
|
if ($this->debugHeaders) {
|
||
|
|
$this->debugHeadersData[] = trim($header);
|
||
|
|
}
|
||
|
|
$this->headerCanonData .= $header;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @throws Swift_SwiftException
|
||
|
|
*
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
private function getEncryptedHash()
|
||
|
|
{
|
||
|
|
$signature = '';
|
||
|
|
switch ($this->hashAlgorithm) {
|
||
|
|
case 'rsa-sha1':
|
||
|
|
$algorithm = OPENSSL_ALGO_SHA1;
|
||
|
|
break;
|
||
|
|
case 'rsa-sha256':
|
||
|
|
$algorithm = OPENSSL_ALGO_SHA256;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
$pkeyId = openssl_get_privatekey($this->privateKey, $this->passphrase);
|
||
|
|
if (!$pkeyId) {
|
||
|
|
throw new Swift_SwiftException('Unable to load DKIM Private Key ['.openssl_error_string().']');
|
||
|
|
}
|
||
|
|
if (openssl_sign($this->headerCanonData, $signature, $pkeyId, $algorithm)) {
|
||
|
|
return $signature;
|
||
|
|
}
|
||
|
|
throw new Swift_SwiftException('Unable to sign DKIM Hash ['.openssl_error_string().']');
|
||
|
|
}
|
||
|
|
}
|