const NS = 'http://salmon-protocol.org/ns/magic-env';
+ protected $data = null; // When stored here it is _always_ base64url encoded
+ protected $data_type = null;
+ protected $encoding = null;
+ protected $alg = null;
+ protected $sig = null;
+
+ /**
+ * Extract envelope data from an XML document containing an <me:env> or <me:provenance> element.
+ *
+ * @param string XML source
+ * @return mixed associative array of envelope data, or false on unrecognized input
+ *
+ * @fixme will spew errors to logs or output in case of XML parse errors
+ * @fixme may give fatal errors if some elements are missing or invalid XML
+ * @fixme calling DOMDocument::loadXML statically triggers warnings in strict mode
+ */
+ public function __construct($xml=null) {
+ if (!empty($xml)) {
+ $dom = DOMDocument::loadXML($xml);
+ if (!$dom instanceof DOMDocument) {
+ throw new ServerException('Tried to load malformed XML as DOM');
+ } elseif (!$this->fromDom($dom)) {
+ throw new ServerException('Could not load MagicEnvelope from DOM');
+ }
+ }
+ }
+
/**
* Get the Salmon keypair from a URI, uses XRD Discovery etc.
*
* includes both the original data and some signing metadata fields as
* the input plaintext for the signature hash.
*
- * @param array $env
* @return string
*/
- public function signingText($env) {
- return implode('.', array($env['data'], // this field is pre-base64'd
- Magicsig::base64_url_encode($env['data_type']),
- Magicsig::base64_url_encode($env['encoding']),
- Magicsig::base64_url_encode($env['alg'])));
+ public function signingText() {
+ return implode('.', array($this->data, // this field is pre-base64'd
+ Magicsig::base64_url_encode($this->data_type),
+ Magicsig::base64_url_encode($this->encoding),
+ Magicsig::base64_url_encode($this->alg)));
}
/**
*
* @param <type> $text
* @param <type> $mimetype
- * @param <type> $keypair
- * @return array: associative array of envelope properties
- * @fixme it might be easier to work with storing envelope data these in the object instead of passing arrays around
+ * @param Magicsig $magicsig Magicsig with private key available.
+ * @return MagicEnvelope object with all properties set
*/
- public function signMessage($text, $mimetype, $keypair)
+ public static function signMessage($text, $mimetype, Magicsig $magicsig)
{
- $signature_alg = Magicsig::fromString($keypair);
- $armored_text = Magicsig::base64_url_encode($text);
- $env = array(
- 'data' => $armored_text,
- 'encoding' => self::ENCODING,
- 'data_type' => $mimetype,
- 'sig' => '',
- 'alg' => $signature_alg->getName()
- );
-
- $env['sig'] = $signature_alg->sign($this->signingText($env));
-
- return $env;
+ $magic_env = new MagicEnvelope();
+
+ // Prepare text and metadata for signing
+ $magic_env->data = Magicsig::base64_url_encode($text);
+ $magic_env->data_type = $mimetype;
+ $magic_env->encoding = self::ENCODING;
+ $magic_env->alg = $magicsig->getName();
+ // Get the actual signature
+ $magic_env->sig = $magicsig->sign($magic_env->signingText());
+
+ return $magic_env;
}
/**
* Create an <me:env> XML representation of the envelope.
*
- * @param array $env associative array with envelope data
* @return string representation of XML document
- * @fixme it might be easier to work with storing envelope data these in the object instead of passing arrays around
*/
- public function toXML($env) {
+ public function toXML() {
$xs = new XMLStringer();
$xs->startXML();
$xs->elementStart('me:env', array('xmlns:me' => self::NS));
- $xs->element('me:data', array('type' => $env['data_type']), $env['data']);
- $xs->element('me:encoding', null, $env['encoding']);
- $xs->element('me:alg', null, $env['alg']);
- $xs->element('me:sig', null, $env['sig']);
+ $xs->element('me:data', array('type' => $this->data_type), $this->data);
+ $xs->element('me:encoding', null, $this->encoding);
+ $xs->element('me:alg', null, $this->alg);
+ $xs->element('me:sig', null, $this->sig);
$xs->elementEnd('me:env');
$string = $xs->getString();
- common_debug($string);
+ common_debug('MagicEnvelope XML: ' . $string);
return $string;
}
* Extract the contained XML payload, and insert a copy of the envelope
* signature data as an <me:provenance> section.
*
- * @param array $env associative array with envelope data
* @return string representation of modified XML document
*
* @fixme in case of XML parsing errors, this will spew to the error log or output
- * @fixme it might be easier to work with storing envelope data these in the object instead of passing arrays around
*/
- public function unfold($env)
+ public function unfold()
{
$dom = new DOMDocument();
- $dom->loadXML(Magicsig::base64_url_decode($env['data']));
+ $dom->loadXML(Magicsig::base64_url_decode($this->data));
if ($dom->documentElement->tagName != 'entry') {
return false;
$prov = $dom->createElementNS(self::NS, 'me:provenance');
$prov->setAttribute('xmlns:me', self::NS);
- $data = $dom->createElementNS(self::NS, 'me:data', $env['data']);
- $data->setAttribute('type', $env['data_type']);
+ $data = $dom->createElementNS(self::NS, 'me:data', $this->data);
+ $data->setAttribute('type', $this->data_type);
$prov->appendChild($data);
- $enc = $dom->createElementNS(self::NS, 'me:encoding', $env['encoding']);
+ $enc = $dom->createElementNS(self::NS, 'me:encoding', $this->encoding);
$prov->appendChild($enc);
- $alg = $dom->createElementNS(self::NS, 'me:alg', $env['alg']);
+ $alg = $dom->createElementNS(self::NS, 'me:alg', $this->alg);
$prov->appendChild($alg);
- $sig = $dom->createElementNS(self::NS, 'me:sig', $env['sig']);
+ $sig = $dom->createElementNS(self::NS, 'me:sig', $this->sig);
$prov->appendChild($sig);
$dom->documentElement->appendChild($prov);
*
* Details of failure conditions are dumped to output log and not exposed to caller.
*
- * @param array $env array representation of magic envelope data, as returned from MagicEnvelope::parse()
* @return boolean
- *
- * @fixme it might be easier to work with storing envelope data these in the object instead of passing arrays around
*/
- public function verify($env)
+ public function verify()
{
- if ($env['alg'] != 'RSA-SHA256') {
+ if ($this->alg != 'RSA-SHA256') {
common_log(LOG_DEBUG, "Salmon error: bad algorithm");
return false;
}
- if ($env['encoding'] != self::ENCODING) {
+ if ($this->encoding != self::ENCODING) {
common_log(LOG_DEBUG, "Salmon error: bad encoding");
return false;
}
- $text = Magicsig::base64_url_decode($env['data']);
+ // $this->data is base64_url_encoded and should contain XML which is passed to getAuthorUri
+ $text = Magicsig::base64_url_decode($this->data);
$signer_uri = $this->getAuthorUri($text);
try {
return false;
}
- return $magicsig->verify($this->signingText($env), $env['sig']);
- }
-
- /**
- * Extract envelope data from an XML document containing an <me:env> or <me:provenance> element.
- *
- * @param string XML source
- * @return mixed associative array of envelope data, or false on unrecognized input
- *
- * @fixme it might be easier to work with storing envelope data these in the object instead of passing arrays around
- * @fixme will spew errors to logs or output in case of XML parse errors
- * @fixme may give fatal errors if some elements are missing or invalid XML
- * @fixme calling DOMDocument::loadXML statically triggers warnings in strict mode
- */
- public function parse($text)
- {
- $dom = DOMDocument::loadXML($text);
- return $this->fromDom($dom);
+ return $magicsig->verify($this->signingText(), $this->sig);
}
/**
* @param DOMDocument $dom
* @return mixed associative array of envelope data, or false on unrecognized input
*
- * @fixme it might be easier to work with storing envelope data these in the object instead of passing arrays around
* @fixme may give fatal errors if some elements are missing
*/
- public function fromDom(DOMDocument $dom)
+ protected function fromDom(DOMDocument $dom)
{
$env_element = $dom->getElementsByTagNameNS(self::NS, 'env')->item(0);
if (!$env_element) {
$data_element = $env_element->getElementsByTagNameNS(self::NS, 'data')->item(0);
$sig_element = $env_element->getElementsByTagNameNS(self::NS, 'sig')->item(0);
- return array(
- 'data' => preg_replace('/\s/', '', $data_element->nodeValue),
- 'data_type' => $data_element->getAttribute('type'),
- 'encoding' => $env_element->getElementsByTagNameNS(self::NS, 'encoding')->item(0)->nodeValue,
- 'alg' => $env_element->getElementsByTagNameNS(self::NS, 'alg')->item(0)->nodeValue,
- 'sig' => preg_replace('/\s/', '', $sig_element->nodeValue),
- );
+
+ $this->data = preg_replace('/\s/', '', $data_element->nodeValue);
+ $this->data_type = $data_element->getAttribute('type');
+ $this->encoding = $env_element->getElementsByTagNameNS(self::NS, 'encoding')->item(0)->nodeValue;
+ $this->alg = $env_element->getElementsByTagNameNS(self::NS, 'alg')->item(0)->nodeValue;
+ $this->sig = preg_replace('/\s/', '', $sig_element->nodeValue);
+ return true;
+ }
+
+ /**
+ * Encode the given string as a signed MagicEnvelope XML document,
+ * using the keypair for the given local user profile. We can of
+ * course not sign a remote profile's slap, since we don't have the
+ * private key.
+ *
+ * Side effects: will create and store a keypair on-demand if one
+ * hasn't already been generated for this user. This can be very slow
+ * on some systems.
+ *
+ * @param string $text XML fragment to sign, assumed to be Atom
+ * @param Profile $actor Profile of a local user to use as signer
+ *
+ * @return string XML string representation of magic envelope
+ *
+ * @throws Exception on bad profile input or key generation problems
+ * @fixme if signing fails, this seems to return the original text without warning. Is there a reason for this?
+ */
+ public static function signForProfile($text, Profile $actor)
+ {
+ // We only generate keys for our local users of course, so let
+ // getUser throw an exception if the profile is not local.
+ $user = $actor->getUser();
+
+ // Find already stored key
+ $magicsig = Magicsig::getKV('user_id', $user->id);
+ if (!$magicsig instanceof Magicsig) {
+ // No keypair yet, let's generate one.
+ $magicsig = new Magicsig();
+ $magicsig->generate($user->id);
+ }
+
+ $magic_env = self::signMessage($text, 'application/atom+xml', $magicsig);
+
+ assert($magicenv instanceof MagicEnvelope);
+
+ return $magic_env;
}
}
projects / quix0rs-gnu-social.git / blobdiff