461 lines
14 KiB
PHP
461 lines
14 KiB
PHP
<?php
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/**
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* @file include/security.php
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*
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* Some security related functions.
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*/
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/**
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* @param int $user_record The account_id
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* @param bool $login_initial default false
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* @param bool $interactive default false
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* @param bool $return
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* @param bool $update_lastlog
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*/
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function authenticate_success($user_record, $login_initial = false, $interactive = false, $return = false, $update_lastlog = false) {
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$a = get_app();
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$_SESSION['addr'] = $_SERVER['REMOTE_ADDR'];
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if(x($user_record, 'account_id')) {
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$a->account = $user_record;
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$_SESSION['account_id'] = $user_record['account_id'];
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$_SESSION['authenticated'] = 1;
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if($login_initial || $update_lastlog) {
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q("update account set account_lastlog = '%s' where account_id = %d",
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dbesc(datetime_convert()),
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intval($_SESSION['account_id'])
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);
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$a->account['account_lastlog'] = datetime_convert();
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call_hooks('logged_in', $a->account);
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}
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$uid_to_load = (((x($_SESSION,'uid')) && (intval($_SESSION['uid'])))
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? intval($_SESSION['uid'])
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: intval($a->account['account_default_channel'])
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);
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if($uid_to_load) {
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change_channel($uid_to_load);
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}
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}
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if($login_initial) {
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call_hooks('logged_in', $user_record);
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// might want to log success here
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}
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if($return || x($_SESSION, 'workflow')) {
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unset($_SESSION['workflow']);
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return;
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}
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if(($a->module !== 'home') && x($_SESSION,'login_return_url') && strlen($_SESSION['login_return_url'])) {
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$return_url = $_SESSION['login_return_url'];
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// don't let members get redirected to a raw ajax page update - this can happen
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// if DHCP changes the IP address at an unfortunate time and paranoia is turned on
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if(strstr($return_url,'update_'))
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$return_url = '';
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unset($_SESSION['login_return_url']);
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goaway($a->get_baseurl() . '/' . $return_url);
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}
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/* This account has never created a channel. Send them to new_channel by default */
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if($a->module === 'login') {
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$r = q("select count(channel_id) as total from channel where channel_account_id = %d and channel_removed = 0 ",
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intval($a->account['account_id'])
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);
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if(($r) && (! $r[0]['total']))
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goaway(z_root() . '/new_channel');
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}
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/* else just return */
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}
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/**
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* @brief Change to another channel with current logged-in account.
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*
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* @param int $change_channel The channel_id of the channel you want to change to
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*
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* @return bool|array false or channel record of the new channel
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*/
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function change_channel($change_channel) {
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$ret = false;
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if($change_channel) {
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$r = q("select channel.*, xchan.* from channel left join xchan on channel.channel_hash = xchan.xchan_hash where channel_id = %d and channel_account_id = %d and channel_removed = 0 limit 1",
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intval($change_channel),
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intval(get_account_id())
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);
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// It's not there. Is this an administrator, and is this the sys channel?
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if (is_developer()) {
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if (! $r) {
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if (is_site_admin()) {
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$r = q("select channel.*, xchan.* from channel left join xchan on channel.channel_hash = xchan.xchan_hash where channel_id = %d and channel_system = 1 and channel_removed = 0 limit 1",
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intval($change_channel)
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);
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}
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}
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}
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if($r) {
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$hash = $r[0]['channel_hash'];
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$_SESSION['uid'] = intval($r[0]['channel_id']);
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get_app()->set_channel($r[0]);
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$_SESSION['theme'] = $r[0]['channel_theme'];
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$_SESSION['mobile_theme'] = get_pconfig(local_channel(),'system', 'mobile_theme');
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date_default_timezone_set($r[0]['channel_timezone']);
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$ret = $r[0];
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}
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$x = q("select * from xchan where xchan_hash = '%s' limit 1",
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dbesc($hash)
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);
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if($x) {
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$_SESSION['my_url'] = $x[0]['xchan_url'];
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$_SESSION['my_address'] = $r[0]['channel_address'] . '@' . substr(get_app()->get_baseurl(), strpos(get_app()->get_baseurl(), '://') + 3);
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get_app()->set_observer($x[0]);
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get_app()->set_perms(get_all_perms(local_channel(), $hash));
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}
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if(! is_dir('store/' . $r[0]['channel_address']))
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@os_mkdir('store/' . $r[0]['channel_address'], STORAGE_DEFAULT_PERMISSIONS,true);
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}
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return $ret;
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}
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/**
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* @brief Creates an addiontal SQL where statement to check permissions.
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*
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* @param int $owner_id
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* @param bool $remote_verified default false, not used at all
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* @param string $groups this param is not used at all
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*
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* @return string additional SQL where statement
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*/
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function permissions_sql($owner_id, $remote_observer = null) {
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$local_channel = local_channel();
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/**
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* Construct permissions
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*
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* default permissions - anonymous user
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*/
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$sql = " AND allow_cid = ''
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AND allow_gid = ''
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AND deny_cid = ''
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AND deny_gid = ''
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";
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/**
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* Profile owner - everything is visible
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*/
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if(($local_channel) && ($local_channel == $owner_id)) {
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$sql = '';
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}
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/**
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* Authenticated visitor. Unless pre-verified,
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* check that the contact belongs to this $owner_id
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* and load the groups the visitor belongs to.
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* If pre-verified, the caller is expected to have already
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* done this and passed the groups into this function.
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*/
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else {
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$observer = (($remote_observer) ? $remote_observer : get_observer_hash());
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if($observer) {
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$groups = init_groups_visitor($observer);
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$gs = '<<>>'; // should be impossible to match
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if(is_array($groups) && count($groups)) {
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foreach($groups as $g)
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$gs .= '|<' . $g . '>';
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}
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$regexop = db_getfunc('REGEXP');
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$sql = sprintf(
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" AND ( NOT (deny_cid like '%s' OR deny_gid $regexop '%s')
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AND ( allow_cid like '%s' OR allow_gid $regexop '%s' OR ( allow_cid = '' AND allow_gid = '') )
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)
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",
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dbesc(protect_sprintf( '%<' . $observer . '>%')),
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dbesc($gs),
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dbesc(protect_sprintf( '%<' . $observer . '>%')),
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dbesc($gs)
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);
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}
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}
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return $sql;
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}
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/**
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* @brief Creates an addiontal SQL where statement to check permissions for an item.
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*
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* @param int $owner_id
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* @param bool $remote_verified default false, not used at all
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* @param string $groups this param is not used at all
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*
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* @return string additional SQL where statement
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*/
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function item_permissions_sql($owner_id, $remote_observer = null) {
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$local_channel = local_channel();
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/**
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* Construct permissions
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*
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* default permissions - anonymous user
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*/
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$sql = " AND item_private = 0 ";
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/**
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* Profile owner - everything is visible
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*/
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if(($local_channel) && ($local_channel == $owner_id)) {
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$sql = '';
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}
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/**
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* Authenticated visitor. Unless pre-verified,
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* check that the contact belongs to this $owner_id
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* and load the groups the visitor belongs to.
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* If pre-verified, the caller is expected to have already
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* done this and passed the groups into this function.
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*/
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else {
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$observer = (($remote_observer) ? $remote_observer : get_observer_hash());
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if($observer) {
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$groups = init_groups_visitor($observer);
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$gs = '<<>>'; // should be impossible to match
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if(is_array($groups) && count($groups)) {
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foreach($groups as $g)
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$gs .= '|<' . $g . '>';
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}
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$regexop = db_getfunc('REGEXP');
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$sql = sprintf(
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" AND ( NOT (deny_cid like '%s' OR deny_gid $regexop '%s')
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AND ( allow_cid like '%s' OR allow_gid $regexop '%s' OR ( allow_cid = '' AND allow_gid = '' AND item_private = 0 ) )
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)
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",
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dbesc(protect_sprintf( '%<' . $observer . '>%')),
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dbesc($gs),
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dbesc(protect_sprintf( '%<' . $observer . '>%')),
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dbesc($gs)
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);
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}
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}
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return $sql;
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}
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/**
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* @param string $observer_hash
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*
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* @return string additional SQL where statement
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*/
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function public_permissions_sql($observer_hash) {
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//$observer = get_app()->get_observer();
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$groups = init_groups_visitor($observer_hash);
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$gs = '<<>>'; // should be impossible to match
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if(is_array($groups) && count($groups)) {
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foreach($groups as $g)
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$gs .= '|<' . $g . '>';
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}
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$sql = '';
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if($observer_hash) {
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$regexop = db_getfunc('REGEXP');
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$sql = sprintf(
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" OR (( NOT (deny_cid like '%s' OR deny_gid $regexop '%s')
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AND ( allow_cid like '%s' OR allow_gid $regexop '%s' OR ( allow_cid = '' AND allow_gid = '' AND item_private = 0 ) )
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))
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",
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dbesc(protect_sprintf( '%<' . $observer_hash . '>%')),
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dbesc($gs),
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dbesc(protect_sprintf( '%<' . $observer_hash . '>%')),
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dbesc($gs)
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);
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}
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return $sql;
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}
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/*
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* Functions used to protect against Cross-Site Request Forgery
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* The security token has to base on at least one value that an attacker can't know - here it's the session ID and the private key.
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* In this implementation, a security token is reusable (if the user submits a form, goes back and resubmits the form, maybe with small changes;
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* or if the security token is used for ajax-calls that happen several times), but only valid for a certain amout of time (3hours).
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* The "typename" seperates the security tokens of different types of forms. This could be relevant in the following case:
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* A security token is used to protekt a link from CSRF (e.g. the "delete this profile"-link).
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* If the new page contains by any chance external elements, then the used security token is exposed by the referrer.
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* Actually, important actions should not be triggered by Links / GET-Requests at all, but somethimes they still are,
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* so this mechanism brings in some damage control (the attacker would be able to forge a request to a form of this type, but not to forms of other types).
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*/
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function get_form_security_token($typename = '') {
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$a = get_app();
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$timestamp = time();
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$sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $timestamp . $typename);
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return $timestamp . '.' . $sec_hash;
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}
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function check_form_security_token($typename = '', $formname = 'form_security_token') {
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if (!x($_REQUEST, $formname)) return false;
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$hash = $_REQUEST[$formname];
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$max_livetime = 10800; // 3 hours
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$a = get_app();
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$x = explode('.', $hash);
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if (time() > (IntVal($x[0]) + $max_livetime)) return false;
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$sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $x[0] . $typename);
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return ($sec_hash == $x[1]);
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}
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function check_form_security_std_err_msg() {
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return t('The form security token was not correct. This probably happened because the form has been opened for too long (>3 hours) before submitting it.') . EOL;
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}
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function check_form_security_token_redirectOnErr($err_redirect, $typename = '', $formname = 'form_security_token') {
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if (!check_form_security_token($typename, $formname)) {
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$a = get_app();
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logger('check_form_security_token failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
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logger('check_form_security_token failed: _REQUEST data: ' . print_r($_REQUEST, true), LOGGER_DATA);
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notice( check_form_security_std_err_msg() );
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goaway($a->get_baseurl() . $err_redirect );
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}
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}
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function check_form_security_token_ForbiddenOnErr($typename = '', $formname = 'form_security_token') {
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if (!check_form_security_token($typename, $formname)) {
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$a = get_app();
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logger('check_form_security_token failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
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logger('check_form_security_token failed: _REQUEST data: ' . print_r($_REQUEST, true), LOGGER_DATA);
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header('HTTP/1.1 403 Forbidden');
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killme();
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}
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}
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// Returns an array of group id's this contact is a member of.
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// This array will only contain group id's related to the uid of this
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// DFRN contact. They are *not* neccessarily unique across the entire site.
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if(! function_exists('init_groups_visitor')) {
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function init_groups_visitor($contact_id) {
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$groups = array();
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$r = q("SELECT hash FROM `groups` left join group_member on groups.id = group_member.gid WHERE xchan = '%s' ",
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dbesc($contact_id)
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);
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if(count($r)) {
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foreach($r as $rr)
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$groups[] = $rr['hash'];
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}
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return $groups;
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}}
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// This is used to determine which uid have posts which are visible to the logged in user (from the API) for the
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// public_timeline, and we can use this in a community page by making
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// $perms = (PERMS_NETWORK|PERMS_PUBLIC) unless logged in.
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// Collect uids of everybody on this site who has opened their posts to everybody on this site (or greater visibility)
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// We always include yourself if logged in because you can always see your own posts
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// resolving granular permissions for the observer against every person and every post on the site
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// will likely be too expensive.
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// Returns a string list of comma separated channel_ids suitable for direct inclusion in a SQL query
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function stream_perms_api_uids($perms = NULL, $limit = 0, $rand = 0 ) {
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$perms = is_null($perms) ? (PERMS_SITE|PERMS_NETWORK|PERMS_PUBLIC) : $perms;
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$ret = array();
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$limit_sql = (($limit) ? " LIMIT " . intval($limit) . " " : '');
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$random_sql = (($rand) ? " ORDER BY " . db_getfunc('RAND') . " " : '');
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if(local_channel())
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$ret[] = local_channel();
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$r = q("select channel_id from channel where channel_r_stream > 0 and ( channel_r_stream & %d )>0 and ( channel_pageflags & %d ) = 0 and channel_system = 0 and channel_removed = 0 $random_sql $limit_sql ",
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intval($perms),
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intval(PAGE_ADULT|PAGE_CENSORED)
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);
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if($r) {
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foreach($r as $rr)
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if(! in_array($rr['channel_id'], $ret))
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$ret[] = $rr['channel_id'];
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}
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$str = '';
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if($ret) {
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foreach($ret as $rr) {
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if($str)
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$str .= ',';
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$str .= intval($rr);
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}
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}
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else
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$str = "''";
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logger('stream_perms_api_uids: ' . $str, LOGGER_DEBUG);
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return $str;
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}
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function stream_perms_xchans($perms = NULL ) {
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$perms = is_null($perms) ? (PERMS_SITE|PERMS_NETWORK|PERMS_PUBLIC) : $perms;
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$ret = array();
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if(local_channel())
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$ret[] = get_observer_hash();
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$r = q("select channel_hash from channel where channel_r_stream > 0 and (channel_r_stream & %d)>0 and not (channel_pageflags & %d)>0 and channel_system = 0 and channel_removed = 0 ",
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intval($perms),
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intval(PAGE_ADULT|PAGE_CENSORED)
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);
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if($r) {
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foreach($r as $rr)
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if(! in_array($rr['channel_hash'], $ret))
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$ret[] = $rr['channel_hash'];
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}
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$str = '';
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if($ret) {
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foreach($ret as $rr) {
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if($str)
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$str .= ',';
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$str .= "'" . dbesc($rr) . "'";
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}
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}
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else
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$str = "''";
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logger('stream_perms_xchans: ' . $str, LOGGER_DEBUG);
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return $str;
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}
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