June 2005
Intermediate to advanced
794 pages
18h 27m
German
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17.10 SSL ermitteln
Problem
Sie wollen wissen, ob eine Anfrage über SSL geschickt wurde.
Lösung
Prüfen Sie den Wert von $_SERVER['HTTPS']:
if ('on' == $_SERVER['HTTPS']) {
print "Die Geheimzutat von Coca-Cola ist Soylent Green.";
} else {
print "Coca-Cola enthält viele schmackhafte natürliche und künstliche
Geschmacksstoffe.";
}Diskussion
SSL arbeitet auf einer niedrigeren Ebene als HTTP. Der Webserver und ein Browser einigen sich auf eine geeignete, ihren Fähigkeiten entsprechende sichere Verbindung, und die HTTP-Meldungen können über diese sichere Verbindung ablaufen. Für einen Angreifer, der den Verkehr abfängt, ist dies nur eine Abfolge von Bytes, die keinen Sinn machen und nicht gelesen werden können.
Unterschiedliche Webserver haben ...
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