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[GH-ISSUE #86] External Service for QR-Code that includes the secret code #270

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opened 2026-03-01 17:48:47 +03:00 by kerem · 3 comments

kerem commented

2026-03-01 17:48:47 +03:00

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Originally created by @apreiml on GitHub (Oct 11, 2017).
Original GitHub issue: https://github.com/antonioribeiro/google2fa/issues/86

Hello,

regarding QRCode::getQRCodeGoogleUrl. I don't think it is a good idea to use an external service for showing the qr code containing the secret key. Shouldn't this secret key be only in the hands of the one to be authenticated? If you use this method, also an external service gets this secret information.

A major security flaw imho.

Kind Regards

Originally created by @apreiml on GitHub (Oct 11, 2017). Original GitHub issue: https://github.com/antonioribeiro/google2fa/issues/86 Hello, regarding `QRCode::getQRCodeGoogleUrl`. I don't think it is a good idea to use an external service for showing the qr code containing the secret key. Shouldn't this secret key be only in the hands of the one to be authenticated? If you use this method, also an external service gets this secret information. A major security flaw imho. Kind Regards

kerem closed this issue

2026-03-01 17:48:47 +03:00

kerem commented

2026-03-01 17:48:47 +03:00

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@tankerkiller125 commented on GitHub (Jan 31, 2018):

There is an option for people who don't want to send it to google, simply put though some servers people use are very ill equipped to generate and show QR codes (generally cheap shared hosting) and because of this they need the option to have google or another provider generate the code for them.

@tankerkiller125 commented on GitHub (Jan 31, 2018): There is an option for people who don't want to send it to google, simply put though some servers people use are very ill equipped to generate and show QR codes (generally cheap shared hosting) and because of this they need the option to have google or another provider generate the code for them.

kerem commented

2026-03-01 17:48:47 +03:00

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@antonioribeiro commented on GitHub (Mar 7, 2018):

@apreiml, people should know it's better inline their QRCode themselves via bacon-qr-code or anything else, but you are right, to not inform this is security issue, so I just changed the way it works: user (developer) has now to authorize it by

$google2fa->setAllowInsecureCallToGoogleApis(true);

Before

$google2fa->getQRCodeGoogleUrl(
    'YourCompany',
    $user->email,
    $user->google2fa_secret
);

Otherwise it will throw an exception with the following message:

It's not secure to send secret keys to Google Apis, you have to explicitly allow it by calling $google2fa->setAllowInsecureCallToGoogleApis(true).

Tagged v3.0.0, since this is a huge breaking change.

Thanks for reporting it.

@antonioribeiro commented on GitHub (Mar 7, 2018): @apreiml, people should know it's better inline their QRCode themselves via bacon-qr-code or anything else, but you are right, to not inform this is security issue, so I just changed the way it works: user (developer) has now to authorize it by ```php $google2fa->setAllowInsecureCallToGoogleApis(true); ``` Before ```php $google2fa->getQRCodeGoogleUrl( 'YourCompany', $user->email, $user->google2fa_secret ); ``` Otherwise it will throw an exception with the following message: ``` It's not secure to send secret keys to Google Apis, you have to explicitly allow it by calling $google2fa->setAllowInsecureCallToGoogleApis(true). ``` Tagged v3.0.0, since this is a huge breaking change. Thanks for reporting it.

kerem commented

2026-03-01 17:48:47 +03:00

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@vdomah commented on GitHub (May 15, 2019):

Hi!
Why can't I find methods getQRCodeGoogleUrl and setAllowInsecureCallToGoogleApis in the sources? I'm getting errors about absence if this methods and I indeed can't find them in this package
Thanks in advance!

@vdomah commented on GitHub (May 15, 2019): Hi! Why can't I find methods getQRCodeGoogleUrl and setAllowInsecureCallToGoogleApis in the sources? I'm getting errors about absence if this methods and I indeed can't find them in this package Thanks in advance!

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