383 lines
16 KiB
PHP
383 lines
16 KiB
PHP
<?php
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/**
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* Name: jappixmini
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* Description: Inserts a jabber chat
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* Version: 1.0
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* Author: leberwurscht
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*
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*/
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/*
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Problem:
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* jabber password should not be stored on server
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* jabber password should not be sent between server and browser as soon as the user is logged in
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* jabber password should not be reconstructible from communication between server and browser as soon as the user is logged in
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Solution:
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Only store an encrypted version of the jabber password on the server. The encryption key is only available to the browser
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and not to the server (at least as soon as the user is logged in). It can be stored using the jappix setDB function.
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This encryption key could be the friendica password, but then this password would be stored in the browser in cleartext.
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It is better to use a hash of the password.
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The server should not be able to reconstruct the password, so we can't take the same hash the server stores. But we can
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use hash("some_prefix"+password). This will however not work with OpenID logins.
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Problem:
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How to discover the jabber addresses of the friendica contacts?
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Solution:
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Each Friendica site with this addon provides a /jappixmini/ module page. We go through our contacts and retrieve
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this information every week using a cron hook.
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Problem:
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We do not want to make the jabber address public.
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Solution:
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When two friendica users connect using DFRN, the relation gets a DFRN ID and a keypair is generated.
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Using this keypair, we can provide the jabber address only to contacs:
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Case 1: Alice has prvkey, Bob has pubkey.
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Alice encrypts request
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Bob decrypts the request, send jabber address unencrypted
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Alice reads address
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Case 2: Alice has prvkey, Bob has pubkey
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Alice send request
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Bob encrypts jabber address
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Alice decrypts jabber address
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*/
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function jappixmini_install() {
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register_hook('plugin_settings', 'addon/jappixmini/jappixmini.php', 'jappixmini_settings');
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register_hook('plugin_settings_post', 'addon/jappixmini/jappixmini.php', 'jappixmini_settings_post');
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register_hook('page_end', 'addon/jappixmini/jappixmini.php', 'jappixmini_script');
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register_hook('authenticate', 'addon/jappixmini/jappixmini.php', 'jappixmini_login');
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register_hook('cron', 'addon/jappixmini/jappixmini.php', 'jappixmini_cron');
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// Jappix source download as required by AGPL
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register_hook('about_hook', 'addon/jappixmini/jappixmini.php', 'jappixmini_download_source');
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}
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function jappixmini_uninstall() {
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unregister_hook('plugin_settings', 'addon/jappixmini/jappixmini.php', 'jappixmini_settings');
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unregister_hook('plugin_settings_post', 'addon/jappixmini/jappixmini.php', 'jappixmini_settings_post');
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unregister_hook('page_end', 'addon/jappixmini/jappixmini.php', 'jappixmini_script');
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unregister_hook('authenticate', 'addon/jappixmini/jappixmini.php', 'jappixmini_login');
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unregister_hook('cron', 'addon/jappixmini/jappixmini.php', 'jappixmini_cron');
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unregister_hook('about_hook', 'addon/jappixmini/jappixmini.php', 'jappixmini_download_source');
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}
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function jappixmini_plugin_admin(&$a, &$o) {
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if (!file_exists("addon/jappixmini/jappix")) {
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$o .= '<p><strong>You need to install the Jappix application, adapted for Friendica (see README).</strong></p>';
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}
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else if (!file_exists("addon/jappixmini/jappix.zip")) {
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$o .= '<p><strong style="color:#fff;background-color:#f00">The source archive jappix.zip does not exist. This is probably a violation of the Jappix License (see README).</strong></p>';
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}
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}
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function jappixmini_plugin_admin_post(&$a) {
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}
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function jappixmini_module() {}
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function jappixmini_init(&$a) {
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// Here, other friendica sites can fetch the jabber address of local users.
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// Because we do not want to publish the addresses publicly, they are encrypted so
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// that only contacts can read it.
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$encrypt_for = $_REQUEST["encrypt_for"];
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if ($encrypt_for) {
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$r = q("SELECT * FROM `contact` WHERE LENGTH(`pubkey`) AND `dfrn-id` = '%s' LIMIT 1",
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dbesc($encrypt_for)
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);
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if (!count($r)) killme();
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// get public key to encrypt address
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$pubkey = $r[0]['pubkey'];
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// get jabber address
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$uid = $r[0]['uid'];
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$username = get_pconfig($uid, 'jappixmini', 'username');
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if (!$username) killme();
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$server = get_pconfig($uid, 'jappixmini', 'server');
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if (!$server) killme();
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$address = $username."@".$server;
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// encrypt address
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$encrypted = "";
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openssl_public_encrypt($address,$encrypted,$pubkey);
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// calculate hex representation of encrypted address
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$hex = bin2hex($encrypted);
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// construct answer
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$answer = Array("status"=>"ok", "encrypted_address"=>$hex);
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// return answer as json
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echo json_encode($answer);
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killme();
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}
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// If we have only a private key, other site sends encrypted request, we answer unencrypted.
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$encrypted_for = $_REQUEST["encrypted_for"];
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if (!$encrypted_for) killme();
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$encrypted_request_hex = $_REQUEST["encrypted_request"];
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if (!$encrypted_request_hex) killme();
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$encrypted_request = hex2bin($encrypted_request_hex);
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$r = q("SELECT * FROM `contact` WHERE LENGTH(`prvkey`) AND `issued-id` = '%s' LIMIT 1",
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dbesc($encrypted_for)
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);
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if (!count($r)) killme();
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// decrypt request, validate it
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$prvkey = $r[0]['prvkey'];
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$decrypted_request = "";
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openssl_private_decrypt($encrypted_request, $decrypted_request, $prvkey);
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if ($decrypted_request!=$encrypted_for) killme();
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// get jabber address
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$uid = $r[0]['uid'];
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$username = get_pconfig($uid, 'jappixmini', 'username');
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if (!$username) killme();
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$server = get_pconfig($uid, 'jappixmini', 'server');
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if (!$server) killme();
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$address = $username."@".$server;
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// construct answer
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$answer = Array("status"=>"ok", "address"=>$address);
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// return answer as json
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echo json_encode($answer);
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killme();
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}
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function jappixmini_settings(&$a, &$s) {
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$username = get_pconfig(local_user(),'jappixmini','username');
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$username = htmlentities($username);
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$server = get_pconfig(local_user(),'jappixmini','server');
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$server = htmlentities($server);
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$bosh = get_pconfig(local_user(),'jappixmini','bosh');
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$bosh = htmlentities($bosh);
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$encrypted_password = get_pconfig(local_user(),'jappixmini','encrypted-password');
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$autosubscribe = get_pconfig(local_user(),'jappixmini','autosubscribe');
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$autosubscribe = intval($autosubscribe) ? ' checked="checked"' : '';
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$autoapprove = get_pconfig(local_user(),'jappixmini','autoapprove');
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$autoapprove = intval($autoapprove) ? ' checked="checked"' : '';
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$activate = get_pconfig(local_user(),'jappixmini','activate');
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$activate = intval($activate) ? ' checked="checked"' : '';
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$s .= '<div class="settings-block">';
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$s .= '<h3>Jappix Mini addon settings</h3>';
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$s .= '<div>';
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$s .= '<label for="jappixmini-activate">Activate addon</label>';
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$s .= ' <input id="jappixmini-activate" type="checkbox" name="jappixmini-activate" value="1"'.$activate.' />';
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$s .= '<br />';
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$s .= '<label for="jappixmini-username">Jabber username</label>';
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$s .= ' <input id="jappixmini-username" type="text" name="jappixmini-username" value="'.$username.'" />';
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$s .= '<br />';
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$s .= '<label for="jappixmini-server">Jabber server</label>';
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$s .= ' <input id="jappixmini-server" type="text" name="jappixmini-server" value="'.$server.'" />';
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$s .= '<br />';
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$s .= '<label for="jappixmini-bosh">Jabber BOSH host</label>';
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$s .= ' <input id="jappixmini-bosh" type="text" name="jappixmini-bosh" value="'.$bosh.'" />';
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$s .= '<br />';
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$s .= '<label for="jappixmini-password">Jabber password</label>';
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$s .= ' <input type="hidden" id="jappixmini-encrypted-password" name="jappixmini-encrypted-password" value="'.$encrypted_password.'" />';
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$onchange = "document.getElementById('jappixmini-encrypted-password').value = jappixmini_addon_encrypt_password(document.getElementById('jappixmini-password').value);";
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$s .= ' <input id="jappixmini-password" type="password" value="" onchange="'.$onchange.'" />';
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$s .= '<br />';
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$s .= '<label for="jappixmini-autoapprove">Approve subscription requests from Friendica contacts automatically</label>';
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$s .= ' <input id="jappixmini-autoapprove" type="checkbox" name="jappixmini-autoapprove" value="1"'.$autoapprove.' />';
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$s .= '<br />';
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$s .= '<label for="jappixmini-autosubscribe">Subscribe to Friendica contacts automatically</label>';
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$s .= ' <input id="jappixmini-autosubscribe" type="checkbox" name="jappixmini-autosubscribe" value="1"'.$autosubscribe.' />';
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$s .= '<br />';
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$s .= '<label for="jappixmini-purge">Purge list of jabber addresses of contacts</label>';
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$s .= ' <input id="jappixmini-purge" type="checkbox" name="jappixmini-purge" value="1" />';
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$s .= '<br />';
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$s .= '<input type="submit" name="jappixmini-submit" value="' . t('Submit') . '" />';
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$s .= '</div>';
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$a->page['htmlhead'] .= "<script type=\"text/javascript\">
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jQuery(document).ready(function() {
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document.getElementById('jappixmini-password').value = jappixmini_addon_decrypt_password('$encrypted_password');
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});
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</script>";
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}
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function jappixmini_settings_post(&$a,&$b) {
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if(! local_user()) return;
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if($_POST['jappixmini-submit']) {
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set_pconfig(local_user(),'jappixmini','username',trim($b['jappixmini-username']));
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set_pconfig(local_user(),'jappixmini','server',trim($b['jappixmini-server']));
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set_pconfig(local_user(),'jappixmini','bosh',trim($b['jappixmini-bosh']));
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set_pconfig(local_user(),'jappixmini','encrypted-password',trim($b['jappixmini-encrypted-password']));
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set_pconfig(local_user(),'jappixmini','autosubscribe',intval($b['jappixmini-autosubscribe']));
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set_pconfig(local_user(),'jappixmini','autoapprove',intval($b['jappixmini-autoapprove']));
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set_pconfig(local_user(),'jappixmini','activate',intval($b['jappixmini-activate']));
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info( 'Jappix Mini settings saved.' );
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if (intval($b['jappixmini-purge'])) {
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$uid = local_user();
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q("DELETE FROM `pconfig` WHERE `uid`=$uid AND `cat`='jappixmini' and `k` LIKE 'id%%'");
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info( 'List of addresses purged.' );
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}
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}
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}
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function jappixmini_script(&$a,&$s) {
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if(! local_user()) return;
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$activate = get_pconfig(local_user(),'jappixmini','activate');
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if (!$activate) return;
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$a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&g=mini.xml"></script>'."\r\n";
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$a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&f=presence.js"></script>'."\r\n";
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$a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&f=caps.js"></script>'."\r\n";
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$a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/jappix/php/get.php?t=js&f=name.js"></script>'."\r\n";
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$a->page['htmlhead'] .= '<script type="text/javascript" src="' . $a->get_baseurl() . '/addon/jappixmini/lib.js"></script>'."\r\n";
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$username = get_pconfig(local_user(),'jappixmini','username');
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$username = str_replace("'", "\\'", $username);
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$server = get_pconfig(local_user(),'jappixmini','server');
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$server = str_replace("'", "\\'", $server);
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$bosh = get_pconfig(local_user(),'jappixmini','bosh');
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$bosh = str_replace("'", "\\'", $bosh);
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$encrypted_password = get_pconfig(local_user(),'jappixmini','encrypted-password');
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$encrypted_password = str_replace("'", "\\'", $encrypted_password);
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$autoapprove = get_pconfig(local_user(),'jappixmini','autoapprove');
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$autoapprove = intval($autoapprove);
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$autosubscribe = get_pconfig(local_user(),'jappixmini','autosubscribe');
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$autosubscribe = intval($autosubscribe);
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// get a list of jabber accounts of the contacts
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$contacts = Array();
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$uid = local_user();
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$rows = q("SELECT `v` FROM `pconfig` WHERE `uid`=$uid AND `cat`='jappixmini' and `k` LIKE 'id%%'");
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foreach ($rows as $row) {
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$value = $row['v'];
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$pos = strpos($value, ":");
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$address = substr($value, $pos+1);
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$contacts[] = $address;
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}
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$contacts_json = json_encode($contacts);
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$a->page['htmlhead'] .= "<script type=\"text/javascript\">
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jQuery(document).ready(function() {
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jappixmini_addon_start('$server', '$username', '$bosh', '$encrypted_password');
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jappixmini_manage_roster($contacts_json, $autoapprove, $autosubscribe);
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});
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</script>";
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return;
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}
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function jappixmini_login(&$a, &$o) {
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// save hash of password using setDB
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$o = str_replace("<form ", "<form onsubmit=\"jappixmini_addon_set_client_secret(this.elements['id_password'].value);return true;\" ", $o);
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}
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function jappixmini_cron(&$a, $d) {
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// For autosubscribe/autoapprove, we need to maintain a list of jabber addresses of our contacts.
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// go through list of users with jabber enabled
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$users = q("SELECT `uid` FROM `pconfig` WHERE `cat`='jappixmini' AND (`k`='autosubscribe' OR `k`='autoapprove') AND `v`='1'");
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foreach ($users as $row) {
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$uid = $row["uid"];
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// for each user, go through list of contacts
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$contacts = q("SELECT * FROM `contact` WHERE `uid`=%d AND ((LENGTH(`dfrn-id`) AND LENGTH(`pubkey`)) OR (LENGTH(`issued-id`) AND LENGTH(`prvkey`)))", intval($uid));
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foreach ($contacts as $contact_row) {
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$request = $contact_row["request"];
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if (!$request) continue;
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$dfrn_id = $contact_row["dfrn-id"];
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$pubkey = $contact_row["pubkey"];
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if (!$dfrn_id) {
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$dfrn_id = $contact_row["issued-id"];
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$prvkey = $contact_row["prvkey"];
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}
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// check if jabber address already present
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$present = get_pconfig($uid, "jappixmini", "id:".$dfrn_id);
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$now = intval(time());
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if ($present) {
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// $present has format "timestamp:jabber_address"
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$p = strpos($present, ":");
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$timestamp = intval(substr($present, 0, $p));
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// do not re-retrieve jabber address if last retrieval
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// is not older than a week
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if ($now-$timestamp<3600*24*7) continue;
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}
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// construct base retrieval address
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$pos = strpos($request, "/dfrn_request/");
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if ($pos===false) continue;
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$base = substr($request, 0, $pos)."/jappixmini";
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// retrieve address
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if ($prvkey) {
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$retrieval_address = $base."?encrypt_for=".urlencode($dfrn_id);
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$answer_json = fetch_url($retrieval_address);
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$answer = json_decode($answer_json);
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if ($answer->status != "ok") continue;
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$encrypted_address_hex = $answer->encrypted_address;
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if (!$encrypted_address_hex) continue;
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$encrypted_address = hex2bin($encrypted_address_hex);
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$decrypted_address = "";
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openssl_private_decrypt($encrypted_address, $decrypted_address, $prvkey);
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if (!$decrypted_address) continue;
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$address = $decrypted_address;
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} else if ($pubkey) {
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$encrypted_request = "";
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openssl_public_encrypt($dfrn_id, $encrypted_request, $pubkey);
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if (!$encrypted_request) continue;
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$encrypted_request_hex = bin2hex($encrypted_request);
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$retrieval_address = $base."?encrypted_for=".urlencode($dfrn_id)."&encrypted_request=".urlencode($encrypted_request_hex);
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$answer_json = fetch_url($retrieval_address);
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$answer = json_decode($answer_json);
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if ($answer->status != "ok") continue;
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$address = $answer->address;
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if (!$address) continue;
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}
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// save address
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set_pconfig($uid, "jappixmini", "id:$dfrn_id", "$now:$address");
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}
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}
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}
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function jappixmini_download_source(&$a,&$b) {
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$b .= '<h1>Jappix Mini</h1>';
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$b .= '<p>This site uses Jappix Mini by the <a href="'.$a->get_baseurl().'/addon/jappixmini/jappix/AUTHORS">Jappix authors</a>, which is distributed under the terms of the <a href="'.$a->get_baseurl().'/addon/jappixmini/jappix/COPYING">GNU Affero General Public License</a>.</p>';
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$b .= '<p>You can download the <a href="'.$a->get_baseurl().'/addon/jappixmini/jappix.zip">source code</a>.</p>';
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}
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