true ]; } function atoken_xchan($atoken) { $c = channelx_by_n($atoken['atoken_uid']); if($c) { return [ 'xchan_hash' => substr($c['channel_hash'],0,16) . '.' . $atoken['atoken_name'], 'xchan_name' => $atoken['atoken_name'], 'xchan_addr' => t('guest:') . $atoken['atoken_name'] . '@' . \App::get_hostname(), 'xchan_network' => 'unknown', 'xchan_hidden' => 1, 'xchan_photo_mimetype' => 'image/jpeg', 'xchan_photo_l' => get_default_profile_photo(300), 'xchan_photo_m' => get_default_profile_photo(80), 'xchan_photo_s' => get_default_profile_photo(48) ]; } } /** * @brief Change to another channel with current logged-in account. * * @param int $change_channel The channel_id of the channel you want to change to * * @return bool|array false or channel record of the new channel */ function change_channel($change_channel) { $ret = false; if($change_channel) { $r = q("select channel.*, xchan.* from channel left join xchan on channel.channel_hash = xchan.xchan_hash where channel_id = %d and channel_account_id = %d and channel_removed = 0 limit 1", intval($change_channel), intval(get_account_id()) ); // It's not there. Is this an administrator, and is this the sys channel? if (is_developer()) { if (! $r) { if (is_site_admin()) { $r = q("select channel.*, xchan.* from channel left join xchan on channel.channel_hash = xchan.xchan_hash where channel_id = %d and channel_system = 1 and channel_removed = 0 limit 1", intval($change_channel) ); } } } if($r) { $hash = $r[0]['channel_hash']; $_SESSION['uid'] = intval($r[0]['channel_id']); App::set_channel($r[0]); $_SESSION['theme'] = $r[0]['channel_theme']; $_SESSION['mobile_theme'] = get_pconfig(local_channel(),'system', 'mobile_theme'); date_default_timezone_set($r[0]['channel_timezone']); $ret = $r[0]; } $x = q("select * from xchan where xchan_hash = '%s' limit 1", dbesc($hash) ); if($x) { $_SESSION['my_url'] = $x[0]['xchan_url']; $_SESSION['my_address'] = $r[0]['channel_address'] . '@' . App::get_hostname(); App::set_observer($x[0]); App::set_perms(get_all_perms(local_channel(), $hash)); } if(! is_dir('store/' . $r[0]['channel_address'])) @os_mkdir('store/' . $r[0]['channel_address'], STORAGE_DEFAULT_PERMISSIONS,true); $arr = [ 'channel_id' => $change_channel, 'chanx' => $ret ]; call_hooks('change_channel', $arr); } return $ret; } /** * @brief Creates an additional SQL where statement to check permissions. * * @param int $owner_id * @param bool $remote_observer - if unset use current observer * * @return string additional SQL where statement */ function permissions_sql($owner_id, $remote_observer = null, $table = '') { $local_channel = local_channel(); /** * Construct permissions * * default permissions - anonymous user */ if($table) $table .= '.'; $sql = " AND {$table}allow_cid = '' AND {$table}allow_gid = '' AND {$table}deny_cid = '' AND {$table}deny_gid = '' "; /** * Profile owner - everything is visible */ if(($local_channel) && ($local_channel == $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. */ else { $observer = ((! is_null($remote_observer)) ? $remote_observer : get_observer_hash()); if($observer) { $groups = init_groups_visitor($observer); $gs = '<<>>'; // should be impossible to match if(is_array($groups) && count($groups)) { foreach($groups as $g) $gs .= '|<' . $g . '>'; } $regexop = db_getfunc('REGEXP'); $sql = sprintf( " AND ( NOT ({$table}deny_cid like '%s' OR {$table}deny_gid $regexop '%s') AND ( {$table}allow_cid like '%s' OR {$table}allow_gid $regexop '%s' OR ( {$table}allow_cid = '' AND {$table}allow_gid = '') ) ) ", dbesc(protect_sprintf( '%<' . $observer . '>%')), dbesc($gs), dbesc(protect_sprintf( '%<' . $observer . '>%')), dbesc($gs) ); } } return $sql; } /** * @brief Creates an addiontal SQL where statement to check permissions for an item. * * @param int $owner_id * @param bool $remote_observer, use current observer if unset * * @return string additional SQL where statement */ function item_permissions_sql($owner_id, $remote_observer = null) { $local_channel = local_channel(); /** * Construct permissions * * default permissions - anonymous user */ $sql = " AND item_private = 0 "; /** * Profile owner - everything is visible */ if(($local_channel) && ($local_channel == $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. */ else { $observer = (($remote_observer) ? $remote_observer : get_observer_hash()); if($observer) { $s = scopes_sql($owner_id,$observer); $groups = init_groups_visitor($observer); $gs = '<<>>'; // should be impossible to match if(is_array($groups) && count($groups)) { foreach($groups as $g) $gs .= '|<' . $g . '>'; } $regexop = db_getfunc('REGEXP'); $sql = sprintf( " AND (( NOT (deny_cid like '%s' OR deny_gid $regexop '%s') AND ( allow_cid like '%s' OR allow_gid $regexop '%s' OR ( allow_cid = '' AND allow_gid = '' AND item_private = 0 )) ) OR ( item_private = 1 $s )) ", dbesc(protect_sprintf( '%<' . $observer . '>%')), dbesc($gs), dbesc(protect_sprintf( '%<' . $observer . '>%')), dbesc($gs) ); } } return $sql; } /** * Remote visitors also need to be checked against the public_scope parameter if item_private is set. * This function checks the various permutations of that field for any which apply to this observer. * */ function scopes_sql($uid,$observer) { $str = " and ( public_policy = 'authenticated' "; if(! is_foreigner($observer)) $str .= " or public_policy = 'network: red' "; if(local_channel()) $str .= " or public_policy = 'site: " . App::get_hostname() . "' "; $ab = q("select * from abook where abook_xchan = '%s' and abook_channel = %d limit 1", dbesc($observer), intval($uid) ); if(! $ab) return $str . " ) "; if($ab[0]['abook_pending']) $str .= " or public_policy = 'any connections' "; $str .= " or public_policy = 'contacts' ) "; return $str; } /** * @param string $observer_hash * * @return string additional SQL where statement */ function public_permissions_sql($observer_hash) { //$observer = App::get_observer(); $groups = init_groups_visitor($observer_hash); $gs = '<<>>'; // should be impossible to match if(is_array($groups) && count($groups)) { foreach($groups as $g) $gs .= '|<' . $g . '>'; } $sql = ''; if($observer_hash) { $regexop = db_getfunc('REGEXP'); $sql = sprintf( " OR (( NOT (deny_cid like '%s' OR deny_gid $regexop '%s') AND ( allow_cid like '%s' OR allow_gid $regexop '%s' OR ( allow_cid = '' AND allow_gid = '' AND item_private = 0 ) ) )) ", dbesc(protect_sprintf( '%<' . $observer_hash . '>%')), dbesc($gs), dbesc(protect_sprintf( '%<' . $observer_hash . '>%')), dbesc($gs) ); } return $sql; } /* * Functions used to protect against Cross-Site Request Forgery * The security token has to base on at least one value that an attacker can't know - here it's the session ID and the private key. * In this implementation, a security token is reusable (if the user submits a form, goes back and resubmits the form, maybe with small changes; * or if the security token is used for ajax-calls that happen several times), but only valid for a certain amout of time (3hours). * The "typename" seperates the security tokens of different types of forms. This could be relevant in the following case: * A security token is used to protekt a link from CSRF (e.g. the "delete this profile"-link). * If the new page contains by any chance external elements, then the used security token is exposed by the referrer. * Actually, important actions should not be triggered by Links / GET-Requests at all, but somethimes they still are, * so this mechanism brings in some damage control (the attacker would be able to forge a request to a form of this type, but not to forms of other types). */ function get_form_security_token($typename = '') { $timestamp = time(); $sec_hash = hash('whirlpool', App::$observer['xchan_guid'] . ((local_channel()) ? App::$channel['channel_prvkey'] : '') . session_id() . $timestamp . $typename); return $timestamp . '.' . $sec_hash; } function check_form_security_token($typename = '', $formname = 'form_security_token') { if (!x($_REQUEST, $formname)) return false; $hash = $_REQUEST[$formname]; $max_livetime = 10800; // 3 hours $x = explode('.', $hash); if (time() > (IntVal($x[0]) + $max_livetime)) return false; $sec_hash = hash('whirlpool', App::$observer['xchan_guid'] . ((local_channel()) ? App::$channel['channel_prvkey'] : '') . session_id() . $x[0] . $typename); return ($sec_hash == $x[1]); } function check_form_security_std_err_msg() { return t('The form security token was not correct. This probably happened because the form has been opened for too long (>3 hours) before submitting it.') . EOL; } function check_form_security_token_redirectOnErr($err_redirect, $typename = '', $formname = 'form_security_token') { if (!check_form_security_token($typename, $formname)) { logger('check_form_security_token failed: user ' . App::$observer['xchan_name'] . ' - form element ' . $typename); logger('check_form_security_token failed: _REQUEST data: ' . print_r($_REQUEST, true), LOGGER_DATA); notice( check_form_security_std_err_msg() ); goaway(z_root() . $err_redirect ); } } function check_form_security_token_ForbiddenOnErr($typename = '', $formname = 'form_security_token') { if (!check_form_security_token($typename, $formname)) { logger('check_form_security_token failed: user ' . App::$observer['xchan_name'] . ' - 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 hash id's on this entire site (across all channels) that this connection is a member of. // var $contact_id = xchan_hash of connection function init_groups_visitor($contact_id) { $groups = array(); $r = q("SELECT hash FROM `groups` left join group_member on groups.id = group_member.gid WHERE xchan = '%s' ", dbesc($contact_id) ); if($r) { foreach($r as $rr) $groups[] = $rr['hash']; } return $groups; } // This is used to determine which uid have posts which are visible to the logged in user (from the API) for the // public_timeline, and we can use this in a community page by making // $perms = (PERMS_NETWORK|PERMS_PUBLIC) unless logged in. // Collect uids of everybody on this site who has opened their posts to everybody on this site (or greater visibility) // We always include yourself if logged in because you can always see your own posts // resolving granular permissions for the observer against every person and every post on the site // will likely be too expensive. // Returns a string list of comma separated channel_ids suitable for direct inclusion in a SQL query function stream_perms_api_uids($perms = NULL, $limit = 0, $rand = 0 ) { $perms = is_null($perms) ? (PERMS_SITE|PERMS_NETWORK|PERMS_PUBLIC) : $perms; $ret = array(); $limit_sql = (($limit) ? " LIMIT " . intval($limit) . " " : ''); $random_sql = (($rand) ? " ORDER BY " . db_getfunc('RAND') . " " : ''); if(local_channel()) $ret[] = local_channel(); $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 $limit_sql ", intval($perms), intval(PAGE_ADULT|PAGE_CENSORED) ); if($r) { foreach($r as $rr) if(! in_array($rr['channel_id'], $ret)) $ret[] = $rr['channel_id']; } $str = ''; if($ret) { foreach($ret as $rr) { if($str) $str .= ','; $str .= intval($rr); } } else $str = "''"; logger('stream_perms_api_uids: ' . $str, LOGGER_DEBUG); return $str; } function stream_perms_xchans($perms = NULL ) { $perms = is_null($perms) ? (PERMS_SITE|PERMS_NETWORK|PERMS_PUBLIC) : $perms; $ret = array(); if(local_channel()) $ret[] = get_observer_hash(); $r = q("select channel_hash from channel where channel_r_stream > 0 and (channel_r_stream & %d)>0 and not (channel_pageflags & %d)>0 and channel_system = 0 and channel_removed = 0 ", intval($perms), intval(PAGE_ADULT|PAGE_CENSORED) ); if($r) { foreach($r as $rr) if(! in_array($rr['channel_hash'], $ret)) $ret[] = $rr['channel_hash']; } $str = ''; if($ret) { foreach($ret as $rr) { if($str) $str .= ','; $str .= "'" . dbesc($rr) . "'"; } } else $str = "''"; logger('stream_perms_xchans: ' . $str, LOGGER_DEBUG); return $str; }