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https://issues.apache.org/jira/browse/GUACAMOLE-1212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17291261#comment-17291261
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Mike Jumper commented on GUACAMOLE-1212:
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The call that authenticates with the LDAP server is here:
https://github.com/apache/guacamole-client/blob/30069886578273c4d118f696214fa7f673e89b6e/extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/LDAPConnectionService.java#L251
> Support 2FA Directly in LDAP Extension
> --------------------------------------
>
> Key: GUACAMOLE-1212
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1212
> Project: Guacamole
> Issue Type: Improvement
> Components: guacamole-auth-ldap
> Reporter: Brett Smith
> Priority: Minor
>
> I'm using FreeIPA in my environment. I have guacamole-auth-ldap enabled and
> configured and it works fine for users who do not have 2FA enabled. For our
> users with 2FA enabled, we are using TOTP tokens provided by FreeIPA.
> When investigating a tcpdump between guacamole and the LDAP server, I can see
> that guacamole passes the username and password to the LDAP server twice.
> This works fine for a traditional username and password, but for a
> 2FA-enabled user, the second authentication attempt returns failure since the
> TOTP is one-time use. 2FA login attempts result in the guacamole logs
> outputting "successfully authenticated" while the web UI shows "Invalid
> Login" in a red banner.
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