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copied!<p>Yes basicly you can connect without authentication but cannot do nearly anything. you can run <code>db.serverBuildInfo()</code></p> <p><code>db.version()</code> </p> <p><code>db.adminCommand({ping:1})</code> </p> <p><code>db.adminCommand({whatsmyuri:1})</code></p> <p><code>db.adminCommand({features:1})</code></p> <p>for example, maybe some other commands. </p> <p>Which is seems a bit pain for me is that able to run:</p> <pre><code>for(var i=0;i++<20000;){db.adminCommand({forceerror:1})} </code></pre> <p>Which generates a bit of log.</p> <p>I checked out the sources, and you can see this behaviour is kind of bug. The sources of the shell startup are in : <a href="https://github.com/mongodb/mongo/blob/master/src/mongo/shell/dbshell.cpp" rel="nofollow">https://github.com/mongodb/mongo/blob/master/src/mongo/shell/dbshell.cpp</a></p> <p>Basicly there are two type of test running against the parameter values given in password and username arguments for mongoshell. The startup checks when you provided a --password parameter and have not wrote a password after. And there is a check when you have not specified to start without db, and you have specified a username which is longer than 0 than it will try to authenticate (check line 1043) </p> <p><code>if (!nodb && username.size())</code> . </p> <p>But that is all. If you not specify credentials at all, it seems will connect without even try to authenticate. I guess in the initialization phase it should be checked weather the process where we connect is running with authentication and force out authenicaion if it needed. </p>

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