WebAuthn registration failure

[rhawdor]

Hello !

I recently updated to Keycloak 22 (more precisely 22.0.1, was using version 21 before), and I think I spotted a bug on WebAuthn security key registration.

Caused by: freemarker.core.NonStringOrTemplateOutputException: For "${...}" content: Expected a string or something automatically convertible to string (number, date or boolean), or "template output" , but this has evaluated to a sequence (wrapper: f.t.SimpleSequence):
==> signatureAlgorithms  [in template "webauthn-register.ftl" at line 47, column 31]
----
FTL stack trace ("~" means nesting-related):
 - Failed at: ${signatureAlgorithms}  [in template "webauthn-register.ftl" at line 47, column 29]
----

Could this be related to #20831 or am I missing something ?

[paulwer]

Hey @rhawdor,
does this error was also present on kc 21.0.1?

[rhawdor]

Hey @paulwer !
To be extremely sure I reproduced it in a clean environment with fresh install from KC and keywind.

• With 22.0.3 the error happen when you want to register a WebAuthn security key.
• With 22.0.1 the security key is correctly registered.

So, to answer, no the error was not present on KC 21.0.1.

[paulwer]

i guess this is due to the following change in keycloak:
keycloak/keycloak@1af4a7a

@lukin should we support the old and the new way for backwards compatibility?

[Clemv95]

I have this error too and this is annoying :/

[paulwer]

a workaround for now would be to stay on 21 from my pov, if this is an option😕

[Clemv95]

it's not really an option :/
How much time do you think it's gonna take ?

[paulwer]

i dont know.
are you able to debug yourself and PR a fix?
maybe we can start from there or move support to only the actual version?

tipp: look at the official integration mentioned beforw, what they changed...maybe this helps

[Clemv95]

I can try myself, but i dont think it's gonna be easy and fast, i'm not really familiar with typescript and tailwind

[paulwer]

from my pov its an issue from mapping internal data by ftl and output it to the script.
ytring changed to array. so the mapping behavior should be edited and not even necessary the typescript script

[Clemv95]

Where is the mapping behavior ?
Maybe i can try

[paulwer]

the line, which is failing according to the error message is: https://github.com/lukin/keywind/blob/master/theme/keywind/login/webauthn-register.ftl#L47C31-L47C50

the variable within keycloak before was: a string separeted by "," and afterwards its a List in java.

Maybe try something like this:

<#if signatureAlgorithms?is_enumerable>${signatureAlgorithms?join(",")}<#else>${signatureAlgorithms}</#if>

(means: if its an array => join it to string, seperated with "," OR if its anything else (probably a string, from versions before) => just display it as string in the html)

and here is the line of official keycloak:
https://github.com/keycloak/keycloak/blob/main/themes/src/main/resources/theme/base/login/webauthn-register.ftl#L42

[scheibling]

the line, which is failing according to the error message is: https://github.com/lukin/keywind/blob/master/theme/keywind/login/webauthn-register.ftl#L47C31-L47C50

the variable within keycloak before was: a string separeted by "," and afterwards its a List in java.

Maybe try something like this:

<#if signatureAlgorithms?is_enumerable>${signatureAlgorithms?join(",")}<#else>${signatureAlgorithms}</#if>

(means: if its an array => join it to string, seperated with "," OR if its anything else (probably a string, from versions before) => just display it as string in the html)

and here is the line of official keycloak: https://github.com/keycloak/keycloak/blob/main/themes/src/main/resources/theme/base/login/webauthn-register.ftl#L42

@paulwer Cheers man, this solved it for me. I've opened up a pull request with that line replaced