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Firefox has started returning an error on registration #54

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davidearl opened this issue Mar 23, 2022 · 1 comment
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Firefox has started returning an error on registration #54

davidearl opened this issue Mar 23, 2022 · 1 comment
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registration failed: Bad Request: cannot decode key response (8)
@davidearl davidearl added the bug Something isn't working label Mar 23, 2022
@davidearl davidearl self-assigned this Mar 23, 2022
davidearl added a commit that referenced this issue Mar 30, 2022
@davidearl
Re #54 , deal with problem in Firefox where it no longer returns the …
616adc7 
…correct length data for aaguid field
@davidearl
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Problem located and worked around.

Looking at the data returned by FireFox it appeared the length of the credID field was turning up too early in the structure returned by FireFox. That led me to a search which yielded this very recent post:
https://www.antradar.com/blog-firefox-webauthn-incompability
indicating there is a FF bug where it only (now) sends one byte where the spec says it should send 16 bytes.

My fix is not quite the same as theirs - if it fails I try it again on the shorter length.

This must be a recent change in FF, as it used to work until not long ago.

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