756 lines
22 KiB
PHP
756 lines
22 KiB
PHP
<?php
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// vim: foldmethod=marker
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/* Generic exception class
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*/
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class OAuthException extends Exception {/*{{{*/
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// pass
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}/*}}}*/
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class OAuthConsumer {/*{{{*/
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public $key;
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public $secret;
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function __construct($key, $secret, $callback_url=NULL) {/*{{{*/
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$this->key = $key;
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$this->secret = $secret;
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$this->callback_url = $callback_url;
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}/*}}}*/
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}/*}}}*/
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class OAuthToken {/*{{{*/
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// access tokens and request tokens
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public $key;
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public $secret;
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/**
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* key = the token
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* secret = the token secret
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*/
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function __construct($key, $secret) {/*{{{*/
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$this->key = $key;
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$this->secret = $secret;
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}/*}}}*/
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/**
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* generates the basic string serialization of a token that a server
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* would respond to request_token and access_token calls with
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*/
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function to_string() {/*{{{*/
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return "oauth_token=" . OAuthUtil::urlencodeRFC3986($this->key) .
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"&oauth_token_secret=" . OAuthUtil::urlencodeRFC3986($this->secret);
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}/*}}}*/
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function __toString() {/*{{{*/
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return $this->to_string();
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}/*}}}*/
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}/*}}}*/
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class OAuthSignatureMethod {/*{{{*/
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public function check_signature(&$request, $consumer, $token, $signature) {
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$built = $this->build_signature($request, $consumer, $token);
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return $built == $signature;
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}
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}/*}}}*/
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class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {/*{{{*/
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function get_name() {/*{{{*/
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return "HMAC-SHA1";
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}/*}}}*/
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public function build_signature($request, $consumer, $token) {/*{{{*/
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$base_string = $request->get_signature_base_string();
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$request->base_string = $base_string;
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$key_parts = array(
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$consumer->secret,
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($token) ? $token->secret : ""
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);
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$key_parts = array_map(array('OAuthUtil','urlencodeRFC3986'), $key_parts);
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$key = implode('&', $key_parts);
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return base64_encode( hash_hmac('sha1', $base_string, $key, true));
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}/*}}}*/
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}/*}}}*/
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class OAuthSignatureMethod_PLAINTEXT extends OAuthSignatureMethod {/*{{{*/
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public function get_name() {/*{{{*/
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return "PLAINTEXT";
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}/*}}}*/
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public function build_signature($request, $consumer, $token) {/*{{{*/
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$sig = array(
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OAuthUtil::urlencodeRFC3986($consumer->secret)
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);
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if ($token) {
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array_push($sig, OAuthUtil::urlencodeRFC3986($token->secret));
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} else {
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array_push($sig, '');
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}
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$raw = implode("&", $sig);
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// for debug purposes
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$request->base_string = $raw;
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return OAuthUtil::urlencodeRFC3986($raw);
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}/*}}}*/
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}/*}}}*/
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class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod {/*{{{*/
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public function get_name() {/*{{{*/
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return "RSA-SHA1";
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}/*}}}*/
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protected function fetch_public_cert(&$request) {/*{{{*/
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// not implemented yet, ideas are:
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// (1) do a lookup in a table of trusted certs keyed off of consumer
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// (2) fetch via http using a url provided by the requester
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// (3) some sort of specific discovery code based on request
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//
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// either way should return a string representation of the certificate
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throw Exception("fetch_public_cert not implemented");
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}/*}}}*/
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protected function fetch_private_cert(&$request) {/*{{{*/
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// not implemented yet, ideas are:
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// (1) do a lookup in a table of trusted certs keyed off of consumer
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//
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// either way should return a string representation of the certificate
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throw Exception("fetch_private_cert not implemented");
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}/*}}}*/
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public function build_signature(&$request, $consumer, $token) {/*{{{*/
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$base_string = $request->get_signature_base_string();
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$request->base_string = $base_string;
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// Fetch the private key cert based on the request
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$cert = $this->fetch_private_cert($request);
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// Pull the private key ID from the certificate
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$privatekeyid = openssl_get_privatekey($cert);
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// Sign using the key
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$ok = openssl_sign($base_string, $signature, $privatekeyid);
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// Release the key resource
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openssl_free_key($privatekeyid);
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return base64_encode($signature);
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} /*}}}*/
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public function check_signature(&$request, $consumer, $token, $signature) {/*{{{*/
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$decoded_sig = base64_decode($signature);
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$base_string = $request->get_signature_base_string();
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// Fetch the public key cert based on the request
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$cert = $this->fetch_public_cert($request);
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// Pull the public key ID from the certificate
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$publickeyid = openssl_get_publickey($cert);
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// Check the computed signature against the one passed in the query
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$ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
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// Release the key resource
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openssl_free_key($publickeyid);
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return $ok == 1;
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} /*}}}*/
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}/*}}}*/
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class OAuthRequest {/*{{{*/
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private $parameters;
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private $http_method;
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private $http_url;
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// for debug purposes
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public $base_string;
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public static $version = '1.0';
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function __construct($http_method, $http_url, $parameters=NULL) {/*{{{*/
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@$parameters or $parameters = array();
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$this->parameters = $parameters;
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$this->http_method = $http_method;
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$this->http_url = $http_url;
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}/*}}}*/
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/**
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* attempt to build up a request from what was passed to the server
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*/
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public static function from_request($http_method=NULL, $http_url=NULL, $parameters=NULL) {/*{{{*/
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$scheme = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on") ? 'http' : 'https';
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@$http_url or $http_url = $scheme . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
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@$http_method or $http_method = $_SERVER['REQUEST_METHOD'];
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$request_headers = OAuthRequest::get_headers();
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// let the library user override things however they'd like, if they know
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// which parameters to use then go for it, for example XMLRPC might want to
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// do this
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if ($parameters) {
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$req = new OAuthRequest($http_method, $http_url, $parameters);
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}
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// next check for the auth header, we need to do some extra stuff
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// if that is the case, namely suck in the parameters from GET or POST
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// so that we can include them in the signature
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else if (@substr($request_headers['Authorization'], 0, 5) == "OAuth") {
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$header_parameters = OAuthRequest::split_header($request_headers['Authorization']);
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if ($http_method == "GET") {
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$req_parameters = $_GET;
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}
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else if ($http_method == "POST") {
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$req_parameters = $_POST;
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}
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$parameters = array_merge($header_parameters, $req_parameters);
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$req = new OAuthRequest($http_method, $http_url, $parameters);
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}
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else if ($http_method == "GET") {
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$req = new OAuthRequest($http_method, $http_url, $_GET);
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}
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else if ($http_method == "POST") {
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$req = new OAuthRequest($http_method, $http_url, $_POST);
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}
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return $req;
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}/*}}}*/
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/**
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* pretty much a helper function to set up the request
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*/
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public static function from_consumer_and_token($consumer, $token, $http_method, $http_url, $parameters=NULL) {/*{{{*/
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@$parameters or $parameters = array();
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$defaults = array("oauth_version" => OAuthRequest::$version,
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"oauth_nonce" => OAuthRequest::generate_nonce(),
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"oauth_timestamp" => OAuthRequest::generate_timestamp(),
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"oauth_consumer_key" => $consumer->key);
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$parameters = array_merge($defaults, $parameters);
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if ($token) {
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$parameters['oauth_token'] = $token->key;
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}
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return new OAuthRequest($http_method, $http_url, $parameters);
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}/*}}}*/
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public function set_parameter($name, $value) {/*{{{*/
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$this->parameters[$name] = $value;
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}/*}}}*/
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public function get_parameter($name) {/*{{{*/
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return $this->parameters[$name];
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}/*}}}*/
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public function get_parameters() {/*{{{*/
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return $this->parameters;
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}/*}}}*/
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/**
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* Returns the normalized parameters of the request
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*
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* This will be all (except oauth_signature) parameters,
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* sorted first by key, and if duplicate keys, then by
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* value.
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*
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* The returned string will be all the key=value pairs
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* concated by &.
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*
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* @return string
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*/
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public function get_signable_parameters() {/*{{{*/
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// Grab all parameters
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$params = $this->parameters;
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// Remove oauth_signature if present
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if (isset($params['oauth_signature'])) {
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unset($params['oauth_signature']);
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}
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// Urlencode both keys and values
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$keys = array_map(array('OAuthUtil', 'urlencodeRFC3986'), array_keys($params));
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$values = array_map(array('OAuthUtil', 'urlencodeRFC3986'), array_values($params));
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$params = array_combine($keys, $values);
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// Sort by keys (natsort)
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uksort($params, 'strnatcmp');
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// Generate key=value pairs
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$pairs = array();
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foreach ($params as $key=>$value ) {
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if (is_array($value)) {
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// If the value is an array, it's because there are multiple
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// with the same key, sort them, then add all the pairs
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natsort($value);
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foreach ($value as $v2) {
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$pairs[] = $key . '=' . $v2;
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}
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} else {
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$pairs[] = $key . '=' . $value;
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}
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}
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// Return the pairs, concated with &
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return implode('&', $pairs);
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}/*}}}*/
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/**
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* Returns the base string of this request
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*
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* The base string defined as the method, the url
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* and the parameters (normalized), each urlencoded
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* and the concated with &.
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*/
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public function get_signature_base_string() {/*{{{*/
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$parts = array(
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$this->get_normalized_http_method(),
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$this->get_normalized_http_url(),
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$this->get_signable_parameters()
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);
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$parts = array_map(array('OAuthUtil', 'urlencodeRFC3986'), $parts);
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return implode('&', $parts);
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}/*}}}*/
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/**
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* just uppercases the http method
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*/
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public function get_normalized_http_method() {/*{{{*/
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return strtoupper($this->http_method);
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}/*}}}*/
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/**
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* parses the url and rebuilds it to be
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* scheme://host/path
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*/
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public function get_normalized_http_url() {/*{{{*/
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$parts = parse_url($this->http_url);
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$port = @$parts['port'];
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$scheme = $parts['scheme'];
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$host = $parts['host'];
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$path = @$parts['path'];
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$port or $port = ($scheme == 'https') ? '443' : '80';
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if (($scheme == 'https' && $port != '443')
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|| ($scheme == 'http' && $port != '80')) {
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$host = "$host:$port";
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}
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return "$scheme://$host$path";
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}/*}}}*/
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/**
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* builds a url usable for a GET request
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*/
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public function to_url() {/*{{{*/
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$out = $this->get_normalized_http_url() . "?";
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$out .= $this->to_postdata();
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return $out;
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}/*}}}*/
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/**
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* builds the data one would send in a POST request
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*/
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public function to_postdata() {/*{{{*/
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$total = array();
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foreach ($this->parameters as $k => $v) {
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$total[] = OAuthUtil::urlencodeRFC3986($k) . "=" . OAuthUtil::urlencodeRFC3986($v);
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}
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$out = implode("&", $total);
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return $out;
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}/*}}}*/
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/**
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* builds the Authorization: header
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*/
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public function to_header($realm="") {/*{{{*/
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$out ='"Authorization: OAuth realm="' . $realm . '",';
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$total = array();
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foreach ($this->parameters as $k => $v) {
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if (substr($k, 0, 5) != "oauth") continue;
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$out .= ',' . OAuthUtil::urlencodeRFC3986($k) . '="' . OAuthUtil::urlencodeRFC3986($v) . '"';
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}
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return $out;
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}/*}}}*/
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public function __toString() {/*{{{*/
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return $this->to_url();
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}/*}}}*/
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public function sign_request($signature_method, $consumer, $token) {/*{{{*/
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$this->set_parameter("oauth_signature_method", $signature_method->get_name());
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$signature = $this->build_signature($signature_method, $consumer, $token);
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$this->set_parameter("oauth_signature", $signature);
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}/*}}}*/
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public function build_signature($signature_method, $consumer, $token) {/*{{{*/
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$signature = $signature_method->build_signature($this, $consumer, $token);
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return $signature;
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}/*}}}*/
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/**
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* util function: current timestamp
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*/
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private static function generate_timestamp() {/*{{{*/
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return time();
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}/*}}}*/
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/**
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* util function: current nonce
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*/
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private static function generate_nonce() {/*{{{*/
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$mt = microtime();
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$rand = mt_rand();
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return md5($mt . $rand); // md5s look nicer than numbers
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}/*}}}*/
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/**
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* util function for turning the Authorization: header into
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* parameters, has to do some unescaping
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*/
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private static function split_header($header) {/*{{{*/
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// remove 'OAuth ' at the start of a header
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$header = substr($header, 6);
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// error cases: commas in parameter values?
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$parts = explode(",", $header);
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$out = array();
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foreach ($parts as $param) {
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$param = ltrim($param);
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// skip the "realm" param, nobody ever uses it anyway
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if (substr($param, 0, 5) != "oauth") continue;
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$param_parts = explode("=", $param);
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// rawurldecode() used because urldecode() will turn a "+" in the
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// value into a space
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$out[$param_parts[0]] = rawurldecode(substr($param_parts[1], 1, -1));
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}
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return $out;
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}/*}}}*/
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/**
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* helper to try to sort out headers for people who aren't running apache
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*/
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private static function get_headers() {/*{{{*/
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if (function_exists('apache_request_headers')) {
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// we need this to get the actual Authorization: header
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// because apache tends to tell us it doesn't exist
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return apache_request_headers();
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}
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// otherwise we don't have apache and are just going to have to hope
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// that $_SERVER actually contains what we need
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$out = array();
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foreach ($_SERVER as $key => $value) {
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if (substr($key, 0, 5) == "HTTP_") {
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// this is chaos, basically it is just there to capitalize the first
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// letter of every word that is not an initial HTTP and strip HTTP
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// code from przemek
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$key = str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($key, 5)))));
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$out[$key] = $value;
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}
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}
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return $out;
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}/*}}}*/
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}/*}}}*/
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class OAuthServer {/*{{{*/
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protected $timestamp_threshold = 300; // in seconds, five minutes
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protected $version = 1.0; // hi blaine
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protected $signature_methods = array();
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protected $data_store;
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function __construct($data_store) {/*{{{*/
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$this->data_store = $data_store;
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}/*}}}*/
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public function add_signature_method($signature_method) {/*{{{*/
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$this->signature_methods[$signature_method->get_name()] =
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$signature_method;
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}/*}}}*/
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// high level functions
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/**
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* process a request_token request
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* returns the request token on success
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*/
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public function fetch_request_token(&$request) {/*{{{*/
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$this->get_version($request);
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$consumer = $this->get_consumer($request);
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// no token required for the initial token request
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$token = NULL;
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$this->check_signature($request, $consumer, $token);
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$new_token = $this->data_store->new_request_token($consumer);
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return $new_token;
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}/*}}}*/
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/**
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* process an access_token request
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* returns the access token on success
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*/
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public function fetch_access_token(&$request) {/*{{{*/
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$this->get_version($request);
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$consumer = $this->get_consumer($request);
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// requires authorized request token
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$token = $this->get_token($request, $consumer, "request");
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$this->check_signature($request, $consumer, $token);
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$new_token = $this->data_store->new_access_token($token, $consumer);
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return $new_token;
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}/*}}}*/
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/**
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* verify an api call, checks all the parameters
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*/
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public function verify_request(&$request) {/*{{{*/
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$this->get_version($request);
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$consumer = $this->get_consumer($request);
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$token = $this->get_token($request, $consumer, "access");
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$this->check_signature($request, $consumer, $token);
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return array($consumer, $token);
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}/*}}}*/
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// Internals from here
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/**
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* version 1
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*/
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private function get_version(&$request) {/*{{{*/
|
|
$version = $request->get_parameter("oauth_version");
|
|
if (!$version) {
|
|
$version = 1.0;
|
|
}
|
|
if ($version && $version != $this->version) {
|
|
throw new OAuthException("OAuth version '$version' not supported");
|
|
}
|
|
return $version;
|
|
}/*}}}*/
|
|
|
|
/**
|
|
* figure out the signature with some defaults
|
|
*/
|
|
private function get_signature_method(&$request) {/*{{{*/
|
|
$signature_method =
|
|
@$request->get_parameter("oauth_signature_method");
|
|
if (!$signature_method) {
|
|
$signature_method = "PLAINTEXT";
|
|
}
|
|
if (!in_array($signature_method,
|
|
array_keys($this->signature_methods))) {
|
|
throw new OAuthException(
|
|
"Signature method '$signature_method' not supported try one of the following: " . implode(", ", array_keys($this->signature_methods))
|
|
);
|
|
}
|
|
return $this->signature_methods[$signature_method];
|
|
}/*}}}*/
|
|
|
|
/**
|
|
* try to find the consumer for the provided request's consumer key
|
|
*/
|
|
private function get_consumer(&$request) {/*{{{*/
|
|
$consumer_key = @$request->get_parameter("oauth_consumer_key");
|
|
if (!$consumer_key) {
|
|
throw new OAuthException("Invalid consumer key");
|
|
}
|
|
|
|
$consumer = $this->data_store->lookup_consumer($consumer_key);
|
|
if (!$consumer) {
|
|
throw new OAuthException("Invalid consumer");
|
|
}
|
|
|
|
return $consumer;
|
|
}/*}}}*/
|
|
|
|
/**
|
|
* try to find the token for the provided request's token key
|
|
*/
|
|
private function get_token(&$request, $consumer, $token_type="access") {/*{{{*/
|
|
$token_field = @$request->get_parameter('oauth_token');
|
|
$token = $this->data_store->lookup_token(
|
|
$consumer, $token_type, $token_field
|
|
);
|
|
if (!$token) {
|
|
throw new OAuthException("Invalid $token_type token: $token_field");
|
|
}
|
|
return $token;
|
|
}/*}}}*/
|
|
|
|
/**
|
|
* all-in-one function to check the signature on a request
|
|
* should guess the signature method appropriately
|
|
*/
|
|
private function check_signature(&$request, $consumer, $token) {/*{{{*/
|
|
// this should probably be in a different method
|
|
$timestamp = @$request->get_parameter('oauth_timestamp');
|
|
$nonce = @$request->get_parameter('oauth_nonce');
|
|
|
|
$this->check_timestamp($timestamp);
|
|
$this->check_nonce($consumer, $token, $nonce, $timestamp);
|
|
|
|
$signature_method = $this->get_signature_method($request);
|
|
|
|
$signature = $request->get_parameter('oauth_signature');
|
|
$valid_sig = $signature_method->check_signature(
|
|
$request,
|
|
$consumer,
|
|
$token,
|
|
$signature
|
|
);
|
|
|
|
if (!$valid_sig) {
|
|
throw new OAuthException("Invalid signature");
|
|
}
|
|
}/*}}}*/
|
|
|
|
/**
|
|
* check that the timestamp is new enough
|
|
*/
|
|
private function check_timestamp($timestamp) {/*{{{*/
|
|
// verify that timestamp is recentish
|
|
$now = time();
|
|
if ($now - $timestamp > $this->timestamp_threshold) {
|
|
throw new OAuthException("Expired timestamp, yours $timestamp, ours $now");
|
|
}
|
|
}/*}}}*/
|
|
|
|
/**
|
|
* check that the nonce is not repeated
|
|
*/
|
|
private function check_nonce($consumer, $token, $nonce, $timestamp) {/*{{{*/
|
|
// verify that the nonce is uniqueish
|
|
$found = $this->data_store->lookup_nonce($consumer, $token, $nonce, $timestamp);
|
|
if ($found) {
|
|
throw new OAuthException("Nonce already used: $nonce");
|
|
}
|
|
}/*}}}*/
|
|
|
|
|
|
|
|
}/*}}}*/
|
|
|
|
class OAuthDataStore {/*{{{*/
|
|
function lookup_consumer($consumer_key) {/*{{{*/
|
|
// implement me
|
|
}/*}}}*/
|
|
|
|
function lookup_token($consumer, $token_type, $token) {/*{{{*/
|
|
// implement me
|
|
}/*}}}*/
|
|
|
|
function lookup_nonce($consumer, $token, $nonce, $timestamp) {/*{{{*/
|
|
// implement me
|
|
}/*}}}*/
|
|
|
|
function fetch_request_token($consumer) {/*{{{*/
|
|
// return a new token attached to this consumer
|
|
}/*}}}*/
|
|
|
|
function fetch_access_token($token, $consumer) {/*{{{*/
|
|
// return a new access token attached to this consumer
|
|
// for the user associated with this token if the request token
|
|
// is authorized
|
|
// should also invalidate the request token
|
|
}/*}}}*/
|
|
|
|
}/*}}}*/
|
|
|
|
|
|
/* A very naive dbm-based oauth storage
|
|
*/
|
|
class SimpleOAuthDataStore extends OAuthDataStore {/*{{{*/
|
|
private $dbh;
|
|
|
|
function __construct($path = "oauth.gdbm") {/*{{{*/
|
|
$this->dbh = dba_popen($path, 'c', 'gdbm');
|
|
}/*}}}*/
|
|
|
|
function __destruct() {/*{{{*/
|
|
dba_close($this->dbh);
|
|
}/*}}}*/
|
|
|
|
function lookup_consumer($consumer_key) {/*{{{*/
|
|
$rv = dba_fetch("consumer_$consumer_key", $this->dbh);
|
|
if ($rv === FALSE) {
|
|
return NULL;
|
|
}
|
|
$obj = unserialize($rv);
|
|
if (!($obj instanceof OAuthConsumer)) {
|
|
return NULL;
|
|
}
|
|
return $obj;
|
|
}/*}}}*/
|
|
|
|
function lookup_token($consumer, $token_type, $token) {/*{{{*/
|
|
$rv = dba_fetch("${token_type}_${token}", $this->dbh);
|
|
if ($rv === FALSE) {
|
|
return NULL;
|
|
}
|
|
$obj = unserialize($rv);
|
|
if (!($obj instanceof OAuthToken)) {
|
|
return NULL;
|
|
}
|
|
return $obj;
|
|
}/*}}}*/
|
|
|
|
function lookup_nonce($consumer, $token, $nonce, $timestamp) {/*{{{*/
|
|
if (dba_exists("nonce_$nonce", $this->dbh)) {
|
|
return TRUE;
|
|
} else {
|
|
dba_insert("nonce_$nonce", "1", $this->dbh);
|
|
return FALSE;
|
|
}
|
|
}/*}}}*/
|
|
|
|
function new_token($consumer, $type="request") {/*{{{*/
|
|
$key = md5(time());
|
|
$secret = time() + time();
|
|
$token = new OAuthToken($key, md5(md5($secret)));
|
|
if (!dba_insert("${type}_$key", serialize($token), $this->dbh)) {
|
|
throw new OAuthException("doooom!");
|
|
}
|
|
return $token;
|
|
}/*}}}*/
|
|
|
|
function new_request_token($consumer) {/*{{{*/
|
|
return $this->new_token($consumer, "request");
|
|
}/*}}}*/
|
|
|
|
function new_access_token($token, $consumer) {/*{{{*/
|
|
|
|
$token = $this->new_token($consumer, 'access');
|
|
dba_delete("request_" . $token->key, $this->dbh);
|
|
return $token;
|
|
}/*}}}*/
|
|
}/*}}}*/
|
|
|
|
class OAuthUtil {/*{{{*/
|
|
public static function urlencodeRFC3986($string) {/*{{{*/
|
|
return str_replace('+', ' ',
|
|
str_replace('%7E', '~', rawurlencode($string)));
|
|
|
|
}/*}}}*/
|
|
|
|
|
|
// This decode function isn't taking into consideration the above
|
|
// modifications to the encoding process. However, this method doesn't
|
|
// seem to be used anywhere so leaving it as is.
|
|
public static function urldecodeRFC3986($string) {/*{{{*/
|
|
return rawurldecode($string);
|
|
}/*}}}*/
|
|
}/*}}}*/
|
|
|
|
?>
|