Seguridad y Privacidad en Redes. Curso 2007

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Detalles Bibliográficos
Autor Principal:	Díaz, Francisco Javier
Otros autores o Colaboradores:	Venosa, Paula, Lanfranco, Einar Felipe, Macia, Nicolás
Formato:	Libro
Lengua:	español
Datos de publicación:	[S.l.]: [S.n.], 2007
Temas:	ENCRIPTACIÓN DE DATOS SEGURIDAD EN REDES
Acceso en línea:	http://catalogo.info.unlp.edu.ar/meran/getDocument.pl?id=1814 Consultar en el Cátalogo
Descripción Física:	Datos electrónicos (3 archivos : 37 KB, 12.8 MB, 6.1 MB)

Tabla de Contenidos:

Programa de estudio. || Teorías: Clase 1 (2006) | Clase 2. Definiciones básicas | Clase 3. Stack TCP/IP | Clase 4. Paquete TCP | Clase
5. Exploits a evitar en el desarrollo de software | Clase 6. Características de Firewall | Clase 7. Filtros | Clase 8. Aplicaciones de la criptografía | Iptables || Prácticas: Práctica 1. Conceptos generales de redes y servicios de red | Práctica 2. Criptografía y sus aplicaciones | Práctica 3. Footprinting, scanning, ennumeration | Práctica 4. Sniffers, detección de sniffers, keyloggers | Trabajos: Entrega 1 | Entrega 1 versión 2 con anexo C | Entrega 2 | Explicación de práctica: Presentación de la práctica | Criptografía, FD, PGP | Escaneadores de puertos | Complemento (scanning) | Sniffers / Einar Lanfranco, Paula Venosa.

foreach (glob($this->path . '/sess_*') as $filename) { if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); } } return true; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return true; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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Seguridad y Privacidad en Redes. Curso 2007

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