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[GH-ISSUE #34] Enhanced license expiration time verification mechanism #29

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opened 2026-02-26 01:35:48 +03:00 by kerem · 3 comments
kerem commented 2026-02-26 01:35:48 +03:00
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Originally created by @shushu789 on GitHub (May 9, 2024).
Original GitHub issue: https://github.com/junian/Standard.Licensing/issues/34

Hello, this is a great library, it's great. But I want to know whether the verification mechanism of the license expiration time can be enhanced to add verification with the Internet time, because if the user modifies the local system time, the license can be made valid forever. If I missed something, please forgive me. Thanks

Originally created by @shushu789 on GitHub (May 9, 2024). Original GitHub issue: https://github.com/junian/Standard.Licensing/issues/34 Hello, this is a great library, it's great. But I want to know whether the verification mechanism of the license expiration time can be enhanced to add verification with the Internet time, because if the user modifies the local system time, the license can be made valid forever. If I missed something, please forgive me. Thanks
kerem closed this issue 2026-02-26 01:35:48 +03:00
kerem commented 2026-02-26 01:35:49 +03:00
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@markadrake commented on GitHub (Jun 8, 2024):

@shushu789 what you stated looks true to me:

github.com/junian/Standard.Licensing@dfbad0e079/src/Standard.Licensing/Validation/LicenseValidationExtensions.cs (L58)

An additional method in the validation chain could be to phone home using a network time protocol and a built-in/configurable tolerance.

<!-- gh-comment-id:2156054378 --> @markadrake commented on GitHub (Jun 8, 2024): @shushu789 what you stated looks true to me: https://github.com/junian/Standard.Licensing/blob/dfbad0e0792f66abf97c848aec8595cabbfeceeb/src/Standard.Licensing/Validation/LicenseValidationExtensions.cs#L58 An additional method in the validation chain could be to phone home using a network time protocol and a built-in/configurable tolerance.
kerem commented 2026-02-26 01:35:49 +03:00
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@shushu789 commented on GitHub (Jun 8, 2024):

@markadrake Thanks for your reply, I implemented this problem myself using NTP time, and it works well now

<!-- gh-comment-id:2156057187 --> @shushu789 commented on GitHub (Jun 8, 2024): @markadrake Thanks for your reply, I implemented this problem myself using NTP time, and it works well now
kerem commented 2026-02-26 01:35:49 +03:00
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@junian commented on GitHub (Jun 9, 2024):

Hi @shushu789,

Thanks for bringing this up. I added an extenstion in v1.1.9 to use custom DateTime. Now you can do something like this:

var serverTime = GetServerTime();
var validationFailures = license.Validate()  
                                .ExpirationDate(systemDateTime: serverTime)  
                                .When(lic => lic.Type == LicenseType.Trial)  
                                .And()  
                                .Signature(publicKey)  
                                .AssertValidLicense();
<!-- gh-comment-id:2156250328 --> @junian commented on GitHub (Jun 9, 2024): Hi @shushu789, Thanks for bringing this up. I added an extenstion in v1.1.9 to use custom DateTime. Now you can do something like this: ```csharp var serverTime = GetServerTime(); var validationFailures = license.Validate() .ExpirationDate(systemDateTime: serverTime) .When(lic => lic.Type == LicenseType.Trial) .And() .Signature(publicKey) .AssertValidLicense(); ```
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