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authornikrou <nikrou@piwigo.org>2006-01-15 13:45:42 +0000
committernikrou <nikrou@piwigo.org>2006-01-15 13:45:42 +0000
commitc3397a2c73273ba5414d976ab7f45ae5e71a8a33 (patch)
treee59456bdf40caf57ca5d3586190c3b3f6e8eb463 /include/functions_session.inc.php
parentb223bb495dbfa1611766cdc528c9eb1af56c43e3 (diff)
Improve security of sessions:
- use only cookies to store session id on client side - use default php session system with database handler to store sessions on server side git-svn-id: http://piwigo.org/svn/trunk@1004 68402e56-0260-453c-a942-63ccdbb3a9ee
Diffstat (limited to 'include/functions_session.inc.php')
-rw-r--r--include/functions_session.inc.php154
1 files changed, 58 insertions, 96 deletions
diff --git a/include/functions_session.inc.php b/include/functions_session.inc.php
index 8a3bb911c..98a85c876 100644
--- a/include/functions_session.inc.php
+++ b/include/functions_session.inc.php
@@ -25,115 +25,77 @@
// | USA. |
// +-----------------------------------------------------------------------+
-// The function generate_key creates a string with pseudo random characters.
-// the size of the string depends on the $conf['session_id_size'].
-// Characters used are a-z A-Z and numerical values. Examples :
-// "Er4Tgh6", "Rrp08P", "54gj"
-// input : none (using global variable)
-// output : $key
-function generate_key($size)
-{
- global $conf;
-
- $md5 = md5(substr(microtime(), 2, 6));
- $init = '';
- for ( $i = 0; $i < strlen( $md5 ); $i++ )
- {
- if ( is_numeric( $md5[$i] ) ) $init.= $md5[$i];
- }
- $init = substr( $init, 0, 8 );
- mt_srand( $init );
- $key = '';
- for ( $i = 0; $i < $size; $i++ )
- {
- $c = mt_rand( 0, 2 );
- if ( $c == 0 ) $key .= chr( mt_rand( 65, 90 ) );
- else if ( $c == 1 ) $key .= chr( mt_rand( 97, 122 ) );
- else $key .= mt_rand( 0, 9 );
- }
- return $key;
+if (isset($conf['session_save_handler']) and ($conf['session_save_handler'] == 'db')) {
+ session_set_save_handler('pwg_session_open',
+ 'pwg_session_close',
+ 'pwg_session_read',
+ 'pwg_session_write',
+ 'pwg_session_destroy',
+ 'pwg_session_gc'
+ );
}
-/**
- * create a new session and returns the session identifier
- *
- * - find a non-already-used session key
- * - create a session in database
- * - return session identifier
- *
- * @param int userid
- * @param int session_lentgh : in seconds
- * @return string
- */
-function session_create($userid, $session_length)
-{
- global $conf;
+ini_set('session.use_cookies', $conf['session_use_cookies']);
+ini_set('session.use_only_cookies', $conf['session_use_only_cookies']);
+ini_set('session.use_trans_sid', $conf['session_use_trans_sid']);
+ini_set('session.name', $conf['session_name']);
- // 1. searching an unused session key
- $id_found = false;
- while (!$id_found)
- {
- $generated_id = generate_key($conf['session_id_size']);
- $query = '
-SELECT id
- FROM '.SESSIONS_TABLE.'
- WHERE id = \''.$generated_id.'\'
-;';
- $result = pwg_query($query);
- if (mysql_num_rows($result) == 0)
- {
- $id_found = true;
- }
- }
- // 3. inserting session in database
- $query = '
-INSERT INTO '.SESSIONS_TABLE.'
- (id,user_id,expiration)
- VALUES
- (\''.$generated_id.'\','.$userid.',
- ADDDATE(NOW(), INTERVAL '.$session_length.' SECOND))
-;';
- pwg_query($query);
-
- $expiration = $session_length + time();
- setcookie('id', $generated_id, $expiration, cookie_path());
-
- return $generated_id;
+function pwg_session_open($path, $name)
+{
+ return true;
}
-// add_session_id adds the id of the session to the string given in
-// parameter as $url. If the session id is the first parameter to the url,
-// it is preceded by a '?', else it is preceded by a '&amp;'. If the
-// parameter $redirect is set to true, '&' is used instead of '&'.
-function add_session_id( $url, $redirect = false )
+function pwg_session_close()
{
- global $page, $user, $conf;
+ pwg_session_gc();
+ return true;
+}
- if ($user['is_the_guest']
- or $user['has_cookie']
- or $conf['apache_authentication'])
- {
- return $url;
+function pwg_session_read($session_id)
+{
+ $query = "SELECT data FROM " . SESSIONS_TABLE;
+ $query .= " WHERE id = '$session_id'";
+ $result = pwg_query($query);
+ if ($result) {
+ $row = mysql_fetch_assoc($result);
+ return $row['data'];
+ } else {
+ return '';
}
+}
- if (preg_match('/\.php\?/', $url))
- {
- $separator = $redirect ? '&' : '&amp;';
- }
- else
- {
- $separator = '?';
+function pwg_session_write($session_id, $data)
+{
+ $query = "SELECT id FROM " . SESSIONS_TABLE;
+ $query .= " WHERE id = '$session_id'";
+ $result = pwg_query($query);
+ if (mysql_num_rows($result)) {
+ $query = "UPDATE " . SESSIONS_TABLE . " SET expiration = now()";
+ $query .= " WHERE id = '$session_id'";
+ pwg_query($query);
+ } else {
+ $query = "INSERT INTO " . SESSIONS_TABLE . " (id,data,expiration)";
+ $query .= " VALUES('$session_id','$data',now())";
+ pwg_query($query);
}
+ return true;
+}
- return $url.$separator.'id='.$page['session_id'];
+function pwg_session_destroy($session_id)
+{
+ $query = "DELETE FROM " . SESSIONS_TABLE;
+ $query .= " WHERE id = '$session_id'";
+ pwg_query($query);
+ return true;
}
-// cookie_path returns the path to use for the PhpWebGallery cookie.
-// If PhpWebGallery is installed on :
-// http://domain.org/meeting/gallery/category.php
-// cookie_path will return : "/meeting/gallery"
-function cookie_path()
+function pwg_session_gc()
{
- return substr($_SERVER['PHP_SELF'],0,strrpos( $_SERVER['PHP_SELF'],'/'));
+ global $conf;
+
+ $query = "DELETE FROM " . SESSIONS_TABLE;
+ $query .= " WHERE UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(expiration) > " . $conf['session_length'];
+ pwg_query($query);
+ return true;
}
?>