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SEBWIN-510: Made lazy initialization of BEK thread-safe.

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This commit is contained in:
Damian Büchel 2022-07-20 20:38:13 +02:00
parent d82d62f35f
commit 20ff39493d
1 changed files with 33 additions and 23 deletions
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10
SafeExamBrowser.Configuration/Cryptography/KeyGenerator.cs
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@ -19,6 +19,8 @@ namespace SafeExamBrowser.Configuration.Cryptography
{ {
public class KeyGenerator : IKeyGenerator public class KeyGenerator : IKeyGenerator
{ {
private readonly object @lock = new object();
private readonly SHA256Managed algorithm; private readonly SHA256Managed algorithm;
private readonly AppConfig appConfig; private readonly AppConfig appConfig;
private readonly IIntegrityModule integrityModule; private readonly IIntegrityModule integrityModule;
@ -59,6 +61,12 @@ namespace SafeExamBrowser.Configuration.Cryptography
var configurationKey = settings.Browser.ConfigurationKey; var configurationKey = settings.Browser.ConfigurationKey;
var salt = settings.Browser.BrowserExamKeySalt; var salt = settings.Browser.BrowserExamKeySalt;
lock (@lock)
{
if (browserExamKey == default)
{
logger.Debug("Initializing browser exam key...");
if (configurationKey == default) if (configurationKey == default)
{ {
configurationKey = ""; configurationKey = "";
@ -87,6 +95,8 @@ namespace SafeExamBrowser.Configuration.Cryptography
browserExamKey = key; browserExamKey = key;
} }
} }
}
}
return browserExamKey; return browserExamKey;
} }