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Documentation advises using an online QR code generator, may leak secrets

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Assessment

Difficulty
1/5
Estimated time
Under an hour
Newbie friendliness
74/100
Issue type
Documentation
Clarity
Mostly clear
Activity status
Active
Tech stack
markdown
Domain
documentation

Research direction

The advice lives in content/client/android/_index.en.md, around line 73, where the page links to qr-code-generator.com for making the configuration QR code. Read the surrounding steps to see how the QR code fits into the setup flow. Done means the online-generator recommendation and its link are removed or replaced with wording that does not suggest sending the configuration string to a third-party website.

Written by the indexing model from the issue text.

Description

The documentation for the Android client advises generating a configuration QR code with an online generator, linking to https://www.qr-code-generator.com/.

https://github.com/rustdesk/doc.rustdesk.com/blob/07b5a65de9202374b4a87de5d0d9b67c29da907d/content/client/android/_index.en.md?plain=1#L73

The configuration string may contain a secret key as well as other confidential, albeit technically non-secret, information (for example, I chose a non-standard port for further obfuscation), therefore I am very skeptical on the security of this approach.

I would strongly advise against recommending using online tools for this, and against this provider in particular. I hold nothing against this generator, and regularly use it for personal and professional purposes, but this web app transmits the string as a query parameter, so the secrets are likely to be stored in some log somewhere along the way.

Image

I do not endorse nor recommend the following offline tool, but I found that it generates a QR code that just works™ : https://sourceforge.net/projects/zint/

Dominant language
HTML
Stars
808
Forks
709
Avg merge
4d 10h
Merged PRs (30d)
3

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