friendica/include/security.php

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<?php
/**
* @brief Calculate the hash that is needed for the "Friendica" cookie
*
* @param array $user Record from "user" table
*
* @return string Hashed data
*/
function cookie_hash($user) {
return(hash("sha256", get_config("system", "site_prvkey").
$user["uprvkey"].
$user["password"]));
}
/**
* @brief Set the "Friendica" cookie
*
* @param int $time
* @param array $user Record from "user" table
*/
function new_cookie($time, $user = array()) {
if ($time != 0) {
$time = $time + time();
}
if ($user) {
$value = json_encode(array("uid" => $user["uid"],
"hash" => cookie_hash($user),
"ip" => $_SERVER['REMOTE_ADDR']));
}
else {
$value = "";
}
setcookie("Friendica", $value, $time, "/", "",
(get_config('system', 'ssl_policy') == SSL_POLICY_FULL), true);
}
function authenticate_success($user_record, $login_initial = false, $interactive = false, $login_refresh = false) {
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$a = get_app();
$_SESSION['uid'] = $user_record['uid'];
$_SESSION['theme'] = $user_record['theme'];
$_SESSION['mobile-theme'] = get_pconfig($user_record['uid'], 'system', 'mobile_theme');
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$_SESSION['authenticated'] = 1;
$_SESSION['page_flags'] = $user_record['page-flags'];
$_SESSION['my_url'] = App::get_baseurl() . '/profile/' . $user_record['nickname'];
$_SESSION['my_address'] = $user_record['nickname'] . '@' . substr(App::get_baseurl(),strpos(App::get_baseurl(),'://')+3);
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$_SESSION['addr'] = $_SERVER['REMOTE_ADDR'];
$a->user = $user_record;
if($interactive) {
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if($a->user['login_date'] <= NULL_DATE) {
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$_SESSION['return_url'] = 'profile_photo/new';
$a->module = 'profile_photo';
info( t("Welcome ") . $a->user['username'] . EOL);
info( t('Please upload a profile photo.') . EOL);
}
else
info( t("Welcome back ") . $a->user['username'] . EOL);
}
$member_since = strtotime($a->user['register_date']);
if(time() < ($member_since + ( 60 * 60 * 24 * 14)))
$_SESSION['new_member'] = true;
else
$_SESSION['new_member'] = false;
if(strlen($a->user['timezone'])) {
date_default_timezone_set($a->user['timezone']);
$a->timezone = $a->user['timezone'];
}
$master_record = $a->user;
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if((x($_SESSION,'submanage')) && intval($_SESSION['submanage'])) {
$r = q("select * from user where uid = %d limit 1",
intval($_SESSION['submanage'])
);
if (dbm::is_result($r))
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$master_record = $r[0];
}
$r = q("SELECT `uid`,`username`,`nickname` FROM `user` WHERE `password` = '%s' AND `email` = '%s' AND `account_removed` = 0 ",
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dbesc($master_record['password']),
dbesc($master_record['email'])
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);
if (dbm::is_result($r))
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$a->identities = $r;
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else
$a->identities = array();
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$r = q("select `user`.`uid`, `user`.`username`, `user`.`nickname`
from manage INNER JOIN user on manage.mid = user.uid where `user`.`account_removed` = 0
and `manage`.`uid` = %d",
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intval($master_record['uid'])
);
if (dbm::is_result($r))
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$a->identities = array_merge($a->identities,$r);
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if($login_initial)
logger('auth_identities: ' . print_r($a->identities,true), LOGGER_DEBUG);
if($login_refresh)
logger('auth_identities refresh: ' . print_r($a->identities,true), LOGGER_DEBUG);
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$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `self` = 1 LIMIT 1",
intval($_SESSION['uid']));
if (dbm::is_result($r)) {
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$a->contact = $r[0];
$a->cid = $r[0]['id'];
$_SESSION['cid'] = $a->cid;
}
header('X-Account-Management-Status: active; name="' . $a->user['username'] . '"; id="' . $a->user['nickname'] .'"');
if($login_initial || $login_refresh) {
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q("UPDATE `user` SET `login_date` = '%s' WHERE `uid` = %d",
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dbesc(datetime_convert()),
intval($_SESSION['uid'])
);
// Set the login date for all identities of the user
q("UPDATE `user` SET `login_date` = '%s' WHERE `password` = '%s' AND `email` = '%s' AND `account_removed` = 0",
dbesc(datetime_convert()),
dbesc($master_record['password']),
dbesc($master_record['email'])
);
}
if ($login_initial) {
// If the user specified to remember the authentication, then set a cookie
// that expires after one week (the default is when the browser is closed).
// The cookie will be renewed automatically.
// The week ensures that sessions will expire after some inactivity.
if ($_SESSION['remember']) {
logger('Injecting cookie for remembered user '. $_SESSION['remember_user']['nickname']);
new_cookie(604800, $user_record);
unset($_SESSION['remember']);
}
}
if ($login_initial) {
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call_hooks('logged_in', $a->user);
if (($a->module !== 'home') && isset($_SESSION['return_url'])) {
goaway(App::get_baseurl() . '/' . $_SESSION['return_url']);
}
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}
}
function can_write_wall(App $a, $owner) {
static $verified = 0;
if ((! (local_user())) && (! (remote_user()))) {
return false;
}
$uid = local_user();
if (($uid) && ($uid == $owner)) {
return true;
}
if (remote_user()) {
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// use remembered decision and avoid a DB lookup for each and every display item
// DO NOT use this function if there are going to be multiple owners
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// We have a contact-id for an authenticated remote user, this block determines if the contact
// belongs to this page owner, and has the necessary permissions to post content
if ($verified === 2) {
return true;
} elseif ($verified === 1) {
return false;
} else {
$cid = 0;
if (is_array($_SESSION['remote'])) {
foreach ($_SESSION['remote'] as $visitor) {
if ($visitor['uid'] == $owner) {
$cid = $visitor['cid'];
break;
}
}
}
if (! $cid) {
return false;
}
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$r = q("SELECT `contact`.*, `user`.`page-flags` FROM `contact` INNER JOIN `user` on `user`.`uid` = `contact`.`uid`
WHERE `contact`.`uid` = %d AND `contact`.`id` = %d AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0
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AND `user`.`blockwall` = 0 AND `readonly` = 0 AND ( `contact`.`rel` IN ( %d , %d ) OR `user`.`page-flags` = %d ) LIMIT 1",
intval($owner),
intval($cid),
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intval(CONTACT_IS_SHARING),
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intval(CONTACT_IS_FRIEND),
intval(PAGE_COMMUNITY)
);
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if (dbm::is_result($r)) {
$verified = 2;
return true;
}
else {
$verified = 1;
}
}
}
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return false;
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}
function permissions_sql($owner_id,$remote_verified = false,$groups = null) {
$local_user = local_user();
$remote_user = remote_user();
/**
* Construct permissions
*
* default permissions - anonymous user
*/
$sql = " AND allow_cid = ''
AND allow_gid = ''
AND deny_cid = ''
AND deny_gid = ''
";
/**
* Profile owner - everything is visible
*/
if(($local_user) && ($local_user == $owner_id)) {
$sql = '';
}
/**
* Authenticated visitor. Unless pre-verified,
* check that the contact belongs to this $owner_id
* and load the groups the visitor belongs to.
* If pre-verified, the caller is expected to have already
* done this and passed the groups into this function.
*/
elseif($remote_user) {
if(! $remote_verified) {
$r = q("SELECT id FROM contact WHERE id = %d AND uid = %d AND blocked = 0 LIMIT 1",
intval($remote_user),
intval($owner_id)
);
if (dbm::is_result($r)) {
$remote_verified = true;
$groups = init_groups_visitor($remote_user);
}
}
if($remote_verified) {
$gs = '<<>>'; // should be impossible to match
if(is_array($groups) && count($groups)) {
foreach($groups as $g)
$gs .= '|<' . intval($g) . '>';
}
/*$sql = sprintf(
" AND ( allow_cid = '' OR allow_cid REGEXP '<%d>' )
AND ( deny_cid = '' OR NOT deny_cid REGEXP '<%d>' )
AND ( allow_gid = '' OR allow_gid REGEXP '%s' )
AND ( deny_gid = '' OR NOT deny_gid REGEXP '%s')
",
intval($remote_user),
intval($remote_user),
dbesc($gs),
dbesc($gs)
);*/
$sql = sprintf(
" AND ( NOT (deny_cid REGEXP '<%d>' OR deny_gid REGEXP '%s')
AND ( allow_cid REGEXP '<%d>' OR allow_gid REGEXP '%s' OR ( allow_cid = '' AND allow_gid = '') )
)
",
intval($remote_user),
dbesc($gs),
intval($remote_user),
dbesc($gs)
);
}
}
return $sql;
}
function item_permissions_sql($owner_id,$remote_verified = false,$groups = null) {
$local_user = local_user();
$remote_user = remote_user();
/**
* Construct permissions
*
* default permissions - anonymous user
*/
$sql = " AND `item`.allow_cid = ''
AND `item`.allow_gid = ''
AND `item`.deny_cid = ''
AND `item`.deny_gid = ''
AND `item`.private = 0
";
/**
* Profile owner - everything is visible
*/
if($local_user && ($local_user == $owner_id)) {
$sql = '';
}
/**
* Authenticated visitor. Unless pre-verified,
* check that the contact belongs to this $owner_id
* and load the groups the visitor belongs to.
* If pre-verified, the caller is expected to have already
* done this and passed the groups into this function.
*/
elseif($remote_user) {
if(! $remote_verified) {
$r = q("SELECT id FROM contact WHERE id = %d AND uid = %d AND blocked = 0 LIMIT 1",
intval($remote_user),
intval($owner_id)
);
if (dbm::is_result($r)) {
$remote_verified = true;
$groups = init_groups_visitor($remote_user);
}
}
if($remote_verified) {
$gs = '<<>>'; // should be impossible to match
if(is_array($groups) && count($groups)) {
foreach($groups as $g)
$gs .= '|<' . intval($g) . '>';
}
$sql = sprintf(
/*" AND ( private = 0 OR ( private in (1,2) AND wall = 1 AND ( allow_cid = '' OR allow_cid REGEXP '<%d>' )
AND ( deny_cid = '' OR NOT deny_cid REGEXP '<%d>' )
AND ( allow_gid = '' OR allow_gid REGEXP '%s' )
AND ( deny_gid = '' OR NOT deny_gid REGEXP '%s')))
",
intval($remote_user),
intval($remote_user),
dbesc($gs),
dbesc($gs)
*/
" AND ( `item`.private = 0 OR ( `item`.private in (1,2) AND `item`.`wall` = 1
AND ( NOT (`item`.deny_cid REGEXP '<%d>' OR `item`.deny_gid REGEXP '%s')
AND ( `item`.allow_cid REGEXP '<%d>' OR `item`.allow_gid REGEXP '%s' OR ( `item`.allow_cid = '' AND `item`.allow_gid = '')))))
",
intval($remote_user),
dbesc($gs),
intval($remote_user),
dbesc($gs)
);
}
}
return $sql;
}
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/*
* Functions used to protect against Cross-Site Request Forgery
* The security token has to base on at least one value that an attacker can't know - here it's the session ID and the private key.
* In this implementation, a security token is reusable (if the user submits a form, goes back and resubmits the form, maybe with small changes;
* or if the security token is used for ajax-calls that happen several times), but only valid for a certain amout of time (3hours).
* The "typename" seperates the security tokens of different types of forms. This could be relevant in the following case:
* A security token is used to protekt a link from CSRF (e.g. the "delete this profile"-link).
* If the new page contains by any chance external elements, then the used security token is exposed by the referrer.
* Actually, important actions should not be triggered by Links / GET-Requests at all, but somethimes they still are,
* so this mechanism brings in some damage control (the attacker would be able to forge a request to a form of this type, but not to forms of other types).
*/
function get_form_security_token($typename = '') {
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$a = get_app();
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$timestamp = time();
$sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $timestamp . $typename);
return $timestamp . '.' . $sec_hash;
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}
function check_form_security_token($typename = '', $formname = 'form_security_token') {
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if (!x($_REQUEST, $formname)) return false;
$hash = $_REQUEST[$formname];
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$max_livetime = 10800; // 3 hours
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$a = get_app();
$x = explode('.', $hash);
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if (time() > (IntVal($x[0]) + $max_livetime)) return false;
$sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $x[0] . $typename);
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return ($sec_hash == $x[1]);
}
function check_form_security_std_err_msg() {
return t('The form security token was not correct. This probably happened because the form has been opened for too long (>3 hours) before submitting it.') . EOL;
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}
function check_form_security_token_redirectOnErr($err_redirect, $typename = '', $formname = 'form_security_token') {
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if (!check_form_security_token($typename, $formname)) {
$a = get_app();
logger('check_form_security_token failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
logger('check_form_security_token failed: _REQUEST data: ' . print_r($_REQUEST, true), LOGGER_DATA);
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notice( check_form_security_std_err_msg() );
goaway(App::get_baseurl() . $err_redirect );
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}
}
function check_form_security_token_ForbiddenOnErr($typename = '', $formname = 'form_security_token') {
if (!check_form_security_token($typename, $formname)) {
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$a = get_app();
logger('check_form_security_token failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
logger('check_form_security_token failed: _REQUEST data: ' . print_r($_REQUEST, true), LOGGER_DATA);
header('HTTP/1.1 403 Forbidden');
killme();
}
}
// Returns an array of group id's this contact is a member of.
// This array will only contain group id's related to the uid of this
// DFRN contact. They are *not* neccessarily unique across the entire site.
if(! function_exists('init_groups_visitor')) {
function init_groups_visitor($contact_id) {
$groups = array();
$r = q("SELECT `gid` FROM `group_member`
WHERE `contact-id` = %d ",
intval($contact_id)
);
if (dbm::is_result($r)) {
foreach($r as $rr)
$groups[] = $rr['gid'];
}
return $groups;
}}