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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-67066] mongod crashes with userToDNMapping &apos;{match: &quot;.+&quot;, substitution: &quot;{0}&quot;}&apos;</title>
                <link>https://jira.mongodb.org/browse/SERVER-67066</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;If a LDAP &lt;tt&gt;userToDNMapping&lt;/tt&gt; rule contains &lt;b&gt;no&lt;/b&gt; matching group but has 1 or more substitutions, &lt;em&gt;mongod&lt;/em&gt; can start up and run but will crash instantly when a mongod user tries to authenticate via LDAP. I was able to reproduce this issue with the latest version of &lt;em&gt;mongod&lt;/em&gt; as well as 5.0 and 4.2.15. I believe it also exists in 4.4.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Lungang&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2063315">SERVER-67066</key>
            <summary>mongod crashes with userToDNMapping &apos;{match: &quot;.+&quot;, substitution: &quot;{0}&quot;}&apos;</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="sara.golemon@mongodb.com">Sara Golemon</assignee>
                                    <reporter username="lungang.fang@mongodb.com">Lungang Fang</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Jun 2022 05:19:06 +0000</created>
                <updated>Sun, 29 Oct 2023 21:37:13 +0000</updated>
                            <resolved>Thu, 16 Jun 2022 01:24:40 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4619423" author="xgen-internal-githook" created="Thu, 16 Jun 2022 00:23:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lungang Fang&apos;, &apos;email&apos;: &apos;lungang.fang@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67066&quot; title=&quot;mongod crashes with userToDNMapping &amp;#39;{match: &amp;quot;.+&amp;quot;, substitution: &amp;quot;{0}&amp;quot;}&amp;#39;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67066&quot;&gt;&lt;del&gt;SERVER-67066&lt;/del&gt;&lt;/a&gt; Ensure userToDNMapping with 0 capture group/non-zero substitution works&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/362058cbfb5d81c98d61d58ac12b89b8d11ee193&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/362058cbfb5d81c98d61d58ac12b89b8d11ee193&lt;/a&gt;&lt;/p&gt;</comment>
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&lt;p&gt;To reproduce this issue, just start a &lt;em&gt;mongod&lt;/em&gt; with LDAP enabled with the following &lt;tt&gt;userToDNMapping&lt;/tt&gt; and then try to login it (say &lt;tt&gt;mongo --username username --password password --authenticationDatabase &apos;$external&apos; --authenticationMechanism PLAIN&lt;/tt&gt;).&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  authorization: enabled&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  ldap:&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      &apos;{&lt;/span&gt;&lt;/pre&gt;
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