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[UTIL] Fix up common_ensure_session()

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Give priority to cookies over GET.

Make sure session ids have only expected characters
(PHP file session handler's limitation).

Replace a mostly useless log warning with a debug message.
This commit is contained in:
Alexei Sorokin 2020-08-06 21:54:49 +03:00
parent 5ea5d30075
commit 46f788d1eb
1 changed files with 22 additions and 9 deletions
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31
lib/util/util.php
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@ -287,20 +287,33 @@ function common_ensure_session()
if (common_config('sessions', 'handle')) {
session_set_save_handler(new InternalSessionHandler(), true);
}
if (array_key_exists(session_name(), $_GET)) {
$id = $_GET[session_name()];
} elseif (array_key_exists(session_name(), $_COOKIE)) {
$id = $_COOKIE[session_name()];
$session_name = session_name();
$id = null;
foreach ([INPUT_COOKIE, INPUT_GET] as $input_type) {
// PHP's session handler only accepts symbols from
// "A" to "Z", "a" to "Z", the comma sign and the minus sign.
$id = filter_input(
$input_type,
$session_name,
FILTER_VALIDATE_REGEXP,
['options' => ['regexp' => '/^[,\-A-Za-z0-9]+$/D']]
);
// Found the session (null is suspicious, so stop at that also)
if ($id !== false) {
break;
}
}
if (isset($id)) {
if (!is_null($id)) {
session_id($id);
}
session_start();
if (!isset($_SESSION['started'])) {
if (!array_key_exists('started', $_SESSION)) {
$_SESSION['started'] = time();
if (!empty($id)) {
common_log(LOG_WARNING, 'Session cookie "' . $_COOKIE[session_name()] . '" ' .
' is set but started value is null');
if (!is_null($id)) {
common_debug(
'Session cookie "' . $id . '" is set but without a session'
);
}
}
}