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https://issues.apache.org/jira/browse/GUACAMOLE-1462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17461130#comment-17461130
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Jens Schleede commented on GUACAMOLE-1462:
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The issues GUACAMOLE-1023 and GUACAMOLE-1100 look like the same encoding bug.
> German umlauts in LDAP user search filter do not work
> -----------------------------------------------------
>
> Key: GUACAMOLE-1462
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1462
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-auth-ldap
> Environment: Docker, MacOS
> Reporter: Jens Schleede
> Priority: Major
>
> I need to use German umlauts within the ldap-user-search-filter keyword, like
>
> {code:java}
> ldap-user-search-filter: (&(objectClass=person)(memberOf=CN=mem,OU=1234 -
> Universität,DC=ad,DC=example,DC=org))
> {code}
> But Guacamole seems not be able to generate a correct LDAP query and so the
> query does not return anything. Testing the same query with Apache Directory
> Studio (that uses the same LDAP code?) works.
> The trace/debug output looks something like
> {code:java}
> TRACE o.a.g.auth.ldap.ObjectQueryService - Sending LDAP filter:
> "(&(&(objectClass=person)(memberOf=\43\4E\3D\6D\65\6D\2C\4F\55\3D\31\32\33\34\20\2D\20\55\6E\69\76\65\72\73\69\74\C3\83\C2\A4\74\2C\44\43\3D\61\64\2C\44\43\3D\65\78\61\6D\70\6C\65\2C\44\43\3D\6F\72\67))(|(sAMAccountName=testuser))){code}
> The attributeValue of memberOf is somehow converted to (ascii) hexcode. The
> german umlaut ä is converted to \c3\a4 (utf hex). Is this intended behaviour?
>
> For testing I used a docker compose project that uses the official Guacamole
> Client and Server Docker images. LDAP server is MS Active Directory.
> I made sure Java/Tomcat uses UTF-8 with environment variable
> JAVA_TOOL_OPTIONS: "-Dfile.encoding=UTF-8 -Dsun.jnu.encoding=UTF-8". But that
> did not change behaviour.
> I also checked the generated guacamole.properties which is valid utf8.
>
> I also tried some escaped variations of the umlaut in the attributeValue in
> guacamole.properties without luck.
> I suspect there is something wrong with the string handling of the LDAP
> parser.
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