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https://issues.apache.org/jira/browse/SOLR-14569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17135974#comment-17135974
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Jason Gerlowski commented on SOLR-14569:
----------------------------------------

A quick attempt at reproducing didn't work for me.  I took a few shortcuts - 
used an embedded ZK, turned on auth with "bin/solr auth enable", used my own 
solrconfig, etc, so maybe that's the problem.  Trying a more faithful 
reproduction now.

That said, I also tried out your attached unit test.  It does fail with a 401, 
but I think there's a bug in the test.  As written, your test case calls 
{{.setBasicAuthCredentials("reader", "reader")}} on the query it makes, but the 
way the security.json is set up, the correct password is "solr" for both the 
"reader" and the "solr" users.  When I corrected that call to 
setBasicAuthCredentials, the test started passing for me.

Including the updated snippet here:

{code}
  @Test
  public void aliasTest() throws Exception {
    try (Http2SolrClient client = new 
Http2SolrClient.Builder(cluster.getJettySolrRunner(0).getBaseUrl().toString())
        .build()){

      // Query fails for alias
      for (int i = 0; i < 30; i++) {
        SolrRequest request = new QueryRequest(params("q", 
"*:*")).setBasicAuthCredentials("reader", "solr");
        SolrResponse response = request.process(client, ALIAS);
        assertNotNull(response);
        assertNotNull(response.getResponse());
        assertNotNull(response.getResponse().get("response"));
      }
    }
  }
{code}

> HTTP 401 when searching on alias in secured Solr
> ------------------------------------------------
>
>                 Key: SOLR-14569
>                 URL: https://issues.apache.org/jira/browse/SOLR-14569
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Authentication
>    Affects Versions: master (9.0), 8.5
>         Environment: Unit test on master branch (9x) built on Windows 10 with 
> Java 11
> Solr 8.5.0 instance running on CentOS 7.7 with Java 11
>            Reporter: Isabelle Giguere
>            Priority: Major
>         Attachments: SOLR-14569.patch, security.json, solr_conf.zip
>
>
> The issue was first noticed on an instance of Solr 8.5.0, after securing Solr 
> with security.json.
> Searching on a single collection returns the expected results, but searching 
> on an alias returns HTTP 401.
> *Note that this issue is not reproduced when the collections are created 
> using the _default configuration.*
> The attached patch includes a unit test that reproduces the issue.
> *Patch applies on master branch (9x)*: Do not include in the regular build !  
> The test is failing to illustrate this issue.
> The unit test is added to the test class that was originally part of the 
> patch to fix SOLR-13510.
> I also attach:
> - our product-specific Solr configuration, modified to remove irrelevant 
> plugins and fields
> - security.json with user 'admin' (pwd 'admin')
> -- Note that forwardCredentials true or false does not modify the behavior
> To test with this configuration:
> - Download and unzip Solr 8.5.0
> - Modify ./bin/solr.in.sh : 
> -- ZK_HOST (optional)
> -- SOLR_AUTH_TYPE="basic"
> -- SOLR_AUTHENTICATION_OPTS="-Dbasicauth=admin:admin"
> - Upload security.json into Zookeeper
> -- ./bin/solr zk cp file:/path/to/security.json 
> zk:/path/to/solr/security.json [-z <zk_host>:<zk_port>[/<solr>]]
> - Start Solr in cloud mode
> -- ./bin/solr -c
> - Upload the provided configuration
> - ./bin/solr zk upconfig -z <zk_host>:<zk_port>[/<solr>] -n conf_en -d 
> /path/to/folder/conf/
> - Create 2 collections using the uploaded configuration
> -- test1, test2
> - Create an alias grouping the 2 collections
> -- test = test1, test2
> - Query (/select?q=\*:\*) one collection
> -- results in successful Solr response
> - Query the alias (/select?q=\*:\*)
> -- results in HTTP 401
> There is no need to add documents to observe the issue.



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