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- <h1><a href="../index.html">MIT Kerberos Documentation</a></h1>
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-
- <section id="ticket-management">
-<h1>Ticket management<a class="headerlink" href="#ticket-management" title="Link to this heading">¶</a></h1>
-<p>On many systems, Kerberos is built into the login program, and you get
-tickets automatically when you log in. Other programs, such as ssh,
-can forward copies of your tickets to a remote host. Most of these
-programs also automatically destroy your tickets when they exit.
-However, MIT recommends that you explicitly destroy your Kerberos
-tickets when you are through with them, just to be sure. One way to
-help ensure that this happens is to add the <a class="reference internal" href="user_commands/kdestroy.html#kdestroy-1"><span class="std std-ref">kdestroy</span></a> command
-to your .logout file. Additionally, if you are going to be away from
-your machine and are concerned about an intruder using your
-permissions, it is safest to either destroy all copies of your
-tickets, or use a screensaver that locks the screen.</p>
-<section id="kerberos-ticket-properties">
-<h2>Kerberos ticket properties<a class="headerlink" href="#kerberos-ticket-properties" title="Link to this heading">¶</a></h2>
-<p>There are various properties that Kerberos tickets can have:</p>
-<p>If a ticket is <strong>forwardable</strong>, then the KDC can issue a new ticket
-(with a different network address, if necessary) based on the
-forwardable ticket. This allows for authentication forwarding without
-requiring a password to be typed in again. For example, if a user
-with a forwardable TGT logs into a remote system, the KDC could issue
-a new TGT for that user with the network address of the remote system,
-allowing authentication on that host to work as though the user were
-logged in locally.</p>
-<p>When the KDC creates a new ticket based on a forwardable ticket, it
-sets the <strong>forwarded</strong> flag on that new ticket. Any tickets that are
-created based on a ticket with the forwarded flag set will also have
-their forwarded flags set.</p>
-<p>A <strong>proxiable</strong> ticket is similar to a forwardable ticket in that it
-allows a service to take on the identity of the client. Unlike a
-forwardable ticket, however, a proxiable ticket is only issued for
-specific services. In other words, a ticket-granting ticket cannot be
-issued based on a ticket that is proxiable but not forwardable.</p>
-<p>A <strong>proxy</strong> ticket is one that was issued based on a proxiable ticket.</p>
-<p>A <strong>postdated</strong> ticket is issued with the invalid flag set. After the
-starting time listed on the ticket, it can be presented to the KDC to
-obtain valid tickets.</p>
-<p>Ticket-granting tickets with the <strong>postdateable</strong> flag set can be used
-to obtain postdated service tickets.</p>
-<p><strong>Renewable</strong> tickets can be used to obtain new session keys without
-the user entering their password again. A renewable ticket has two
-expiration times. The first is the time at which this particular
-ticket expires. The second is the latest possible expiration time for
-any ticket issued based on this renewable ticket.</p>
-<p>A ticket with the <strong>initial flag</strong> set was issued based on the
-authentication protocol, and not on a ticket-granting ticket.
-Application servers that wish to ensure that the user’s key has been
-recently presented for verification could specify that this flag must
-be set to accept the ticket.</p>
-<p>An <strong>invalid</strong> ticket must be rejected by application servers.
-Postdated tickets are usually issued with this flag set, and must be
-validated by the KDC before they can be used.</p>
-<p>A <strong>preauthenticated</strong> ticket is one that was only issued after the
-client requesting the ticket had authenticated itself to the KDC.</p>
-<p>The <strong>hardware authentication</strong> flag is set on a ticket which required
-the use of hardware for authentication. The hardware is expected to
-be possessed only by the client which requested the tickets.</p>
-<p>If a ticket has the <strong>transit policy</strong> checked flag set, then the KDC
-that issued this ticket implements the transited-realm check policy
-and checked the transited-realms list on the ticket. The
-transited-realms list contains a list of all intermediate realms
-between the realm of the KDC that issued the first ticket and that of
-the one that issued the current ticket. If this flag is not set, then
-the application server must check the transited realms itself or else
-reject the ticket.</p>
-<p>The <strong>okay as delegate</strong> flag indicates that the server specified in
-the ticket is suitable as a delegate as determined by the policy of
-that realm. Some client applications may use this flag to decide
-whether to forward tickets to a remote host, although many
-applications do not honor it.</p>
-<p>An <strong>anonymous</strong> ticket is one in which the named principal is a
-generic principal for that realm; it does not actually specify the
-individual that will be using the ticket. This ticket is meant only
-to securely distribute a session key.</p>
-</section>
-<section id="obtaining-tickets-with-kinit">
-<span id="obtain-tkt"></span><h2>Obtaining tickets with kinit<a class="headerlink" href="#obtaining-tickets-with-kinit" title="Link to this heading">¶</a></h2>
-<p>If your site has integrated Kerberos V5 with the login system, you
-will get Kerberos tickets automatically when you log in. Otherwise,
-you may need to explicitly obtain your Kerberos tickets, using the
-<a class="reference internal" href="user_commands/kinit.html#kinit-1"><span class="std std-ref">kinit</span></a> program. Similarly, if your Kerberos tickets expire,
-use the kinit program to obtain new ones.</p>
-<p>To use the kinit program, simply type <code class="docutils literal notranslate"><span class="pre">kinit</span></code> and then type your
-password at the prompt. For example, Jennifer (whose username is
-<code class="docutils literal notranslate"><span class="pre">jennifer</span></code>) works for Bleep, Inc. (a fictitious company with the
-domain name mit.edu and the Kerberos realm ATHENA.MIT.EDU). She would
-type:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">kinit</span>
-<span class="n">Password</span> <span class="k">for</span> <span class="n">jennifer</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span><span class="p">:</span> <span class="o">&lt;--</span> <span class="p">[</span><span class="n">Type</span> <span class="n">jennifer</span><span class="s1">&#39;s password here.]</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<p>If you type your password incorrectly, kinit will give you the
-following error message:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">kinit</span>
-<span class="n">Password</span> <span class="k">for</span> <span class="n">jennifer</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span><span class="p">:</span> <span class="o">&lt;--</span> <span class="p">[</span><span class="n">Type</span> <span class="n">the</span> <span class="n">wrong</span> <span class="n">password</span> <span class="n">here</span><span class="o">.</span><span class="p">]</span>
-<span class="n">kinit</span><span class="p">:</span> <span class="n">Password</span> <span class="n">incorrect</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<p>and you won’t get Kerberos tickets.</p>
-<p>By default, kinit assumes you want tickets for your own username in
-your default realm. Suppose Jennifer’s friend David is visiting, and
-he wants to borrow a window to check his mail. David needs to get
-tickets for himself in his own realm, EXAMPLE.COM. He would type:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">kinit</span> <span class="n">david</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">COM</span>
-<span class="n">Password</span> <span class="k">for</span> <span class="n">david</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">COM</span><span class="p">:</span> <span class="o">&lt;--</span> <span class="p">[</span><span class="n">Type</span> <span class="n">david</span><span class="s1">&#39;s password here.]</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<p>David would then have tickets which he could use to log onto his own
-machine. Note that he typed his password locally on Jennifer’s
-machine, but it never went over the network. Kerberos on the local
-host performed the authentication to the KDC in the other realm.</p>
-<p>If you want to be able to forward your tickets to another host, you
-need to request forwardable tickets. You do this by specifying the
-<strong>-f</strong> option:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">kinit</span> <span class="o">-</span><span class="n">f</span>
-<span class="n">Password</span> <span class="k">for</span> <span class="n">jennifer</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span><span class="p">:</span> <span class="o">&lt;--</span> <span class="p">[</span><span class="n">Type</span> <span class="n">your</span> <span class="n">password</span> <span class="n">here</span><span class="o">.</span><span class="p">]</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<p>Note that kinit does not tell you that it obtained forwardable
-tickets; you can verify this using the <a class="reference internal" href="user_commands/klist.html#klist-1"><span class="std std-ref">klist</span></a> command (see
-<a class="reference internal" href="#view-tkt"><span class="std std-ref">Viewing tickets with klist</span></a>).</p>
-<p>Normally, your tickets are good for your system’s default ticket
-lifetime, which is ten hours on many systems. You can specify a
-different ticket lifetime with the <strong>-l</strong> option. Add the letter
-<strong>s</strong> to the value for seconds, <strong>m</strong> for minutes, <strong>h</strong> for hours, or
-<strong>d</strong> for days. For example, to obtain forwardable tickets for
-<code class="docutils literal notranslate"><span class="pre">david&#64;EXAMPLE.COM</span></code> that would be good for three hours, you would
-type:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">kinit</span> <span class="o">-</span><span class="n">f</span> <span class="o">-</span><span class="n">l</span> <span class="mi">3</span><span class="n">h</span> <span class="n">david</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">COM</span>
-<span class="n">Password</span> <span class="k">for</span> <span class="n">david</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">COM</span><span class="p">:</span> <span class="o">&lt;--</span> <span class="p">[</span><span class="n">Type</span> <span class="n">david</span><span class="s1">&#39;s password here.]</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<div class="admonition note">
-<p class="admonition-title">Note</p>
-<p>You cannot mix units; specifying a lifetime of 3h30m would
-result in an error. Note also that most systems specify a
-maximum ticket lifetime. If you request a longer ticket
-lifetime, it will be automatically truncated to the maximum
-lifetime.</p>
-</div>
-</section>
-<section id="viewing-tickets-with-klist">
-<span id="view-tkt"></span><h2>Viewing tickets with klist<a class="headerlink" href="#viewing-tickets-with-klist" title="Link to this heading">¶</a></h2>
-<p>The <a class="reference internal" href="user_commands/klist.html#klist-1"><span class="std std-ref">klist</span></a> command shows your tickets. When you first obtain
-tickets, you will have only the ticket-granting ticket. The listing
-would look like this:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">klist</span>
-<span class="n">Ticket</span> <span class="n">cache</span><span class="p">:</span> <span class="o">/</span><span class="n">tmp</span><span class="o">/</span><span class="n">krb5cc_ttypa</span>
-<span class="n">Default</span> <span class="n">principal</span><span class="p">:</span> <span class="n">jennifer</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-
-<span class="n">Valid</span> <span class="n">starting</span> <span class="n">Expires</span> <span class="n">Service</span> <span class="n">principal</span>
-<span class="mi">06</span><span class="o">/</span><span class="mi">07</span><span class="o">/</span><span class="mi">04</span> <span class="mi">19</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">21</span> <span class="mi">06</span><span class="o">/</span><span class="mi">08</span><span class="o">/</span><span class="mi">04</span> <span class="mi">05</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">19</span> <span class="n">krbtgt</span><span class="o">/</span><span class="n">ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<p>The ticket cache is the location of your ticket file. In the above
-example, this file is named <code class="docutils literal notranslate"><span class="pre">/tmp/krb5cc_ttypa</span></code>. The default
-principal is your Kerberos principal.</p>
-<p>The “valid starting” and “expires” fields describe the period of time
-during which the ticket is valid. The “service principal” describes
-each ticket. The ticket-granting ticket has a first component
-<code class="docutils literal notranslate"><span class="pre">krbtgt</span></code>, and a second component which is the realm name.</p>
-<p>Now, if <code class="docutils literal notranslate"><span class="pre">jennifer</span></code> connected to the machine <code class="docutils literal notranslate"><span class="pre">daffodil.mit.edu</span></code>,
-and then typed “klist” again, she would have gotten the following
-result:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">klist</span>
-<span class="n">Ticket</span> <span class="n">cache</span><span class="p">:</span> <span class="o">/</span><span class="n">tmp</span><span class="o">/</span><span class="n">krb5cc_ttypa</span>
-<span class="n">Default</span> <span class="n">principal</span><span class="p">:</span> <span class="n">jennifer</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-
-<span class="n">Valid</span> <span class="n">starting</span> <span class="n">Expires</span> <span class="n">Service</span> <span class="n">principal</span>
-<span class="mi">06</span><span class="o">/</span><span class="mi">07</span><span class="o">/</span><span class="mi">04</span> <span class="mi">19</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">21</span> <span class="mi">06</span><span class="o">/</span><span class="mi">08</span><span class="o">/</span><span class="mi">04</span> <span class="mi">05</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">19</span> <span class="n">krbtgt</span><span class="o">/</span><span class="n">ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-<span class="mi">06</span><span class="o">/</span><span class="mi">07</span><span class="o">/</span><span class="mi">04</span> <span class="mi">20</span><span class="p">:</span><span class="mi">22</span><span class="p">:</span><span class="mi">30</span> <span class="mi">06</span><span class="o">/</span><span class="mi">08</span><span class="o">/</span><span class="mi">04</span> <span class="mi">05</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">19</span> <span class="n">host</span><span class="o">/</span><span class="n">daffodil</span><span class="o">.</span><span class="n">mit</span><span class="o">.</span><span class="n">edu</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<p>Here’s what happened: when <code class="docutils literal notranslate"><span class="pre">jennifer</span></code> used ssh to connect to the
-host <code class="docutils literal notranslate"><span class="pre">daffodil.mit.edu</span></code>, the ssh program presented her
-ticket-granting ticket to the KDC and requested a host ticket for the
-host <code class="docutils literal notranslate"><span class="pre">daffodil.mit.edu</span></code>. The KDC sent the host ticket, which ssh
-then presented to the host <code class="docutils literal notranslate"><span class="pre">daffodil.mit.edu</span></code>, and she was allowed
-to log in without typing her password.</p>
-<p>Suppose your Kerberos tickets allow you to log into a host in another
-domain, such as <code class="docutils literal notranslate"><span class="pre">trillium.example.com</span></code>, which is also in another
-Kerberos realm, <code class="docutils literal notranslate"><span class="pre">EXAMPLE.COM</span></code>. If you ssh to this host, you will
-receive a ticket-granting ticket for the realm <code class="docutils literal notranslate"><span class="pre">EXAMPLE.COM</span></code>, plus
-the new host ticket for <code class="docutils literal notranslate"><span class="pre">trillium.example.com</span></code>. klist will now
-show:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">klist</span>
-<span class="n">Ticket</span> <span class="n">cache</span><span class="p">:</span> <span class="o">/</span><span class="n">tmp</span><span class="o">/</span><span class="n">krb5cc_ttypa</span>
-<span class="n">Default</span> <span class="n">principal</span><span class="p">:</span> <span class="n">jennifer</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-
-<span class="n">Valid</span> <span class="n">starting</span> <span class="n">Expires</span> <span class="n">Service</span> <span class="n">principal</span>
-<span class="mi">06</span><span class="o">/</span><span class="mi">07</span><span class="o">/</span><span class="mi">04</span> <span class="mi">19</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">21</span> <span class="mi">06</span><span class="o">/</span><span class="mi">08</span><span class="o">/</span><span class="mi">04</span> <span class="mi">05</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">19</span> <span class="n">krbtgt</span><span class="o">/</span><span class="n">ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-<span class="mi">06</span><span class="o">/</span><span class="mi">07</span><span class="o">/</span><span class="mi">04</span> <span class="mi">20</span><span class="p">:</span><span class="mi">22</span><span class="p">:</span><span class="mi">30</span> <span class="mi">06</span><span class="o">/</span><span class="mi">08</span><span class="o">/</span><span class="mi">04</span> <span class="mi">05</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">19</span> <span class="n">host</span><span class="o">/</span><span class="n">daffodil</span><span class="o">.</span><span class="n">mit</span><span class="o">.</span><span class="n">edu</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-<span class="mi">06</span><span class="o">/</span><span class="mi">07</span><span class="o">/</span><span class="mi">04</span> <span class="mi">20</span><span class="p">:</span><span class="mi">24</span><span class="p">:</span><span class="mi">18</span> <span class="mi">06</span><span class="o">/</span><span class="mi">08</span><span class="o">/</span><span class="mi">04</span> <span class="mi">05</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">19</span> <span class="n">krbtgt</span><span class="o">/</span><span class="n">EXAMPLE</span><span class="o">.</span><span class="n">COM</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-<span class="mi">06</span><span class="o">/</span><span class="mi">07</span><span class="o">/</span><span class="mi">04</span> <span class="mi">20</span><span class="p">:</span><span class="mi">24</span><span class="p">:</span><span class="mi">18</span> <span class="mi">06</span><span class="o">/</span><span class="mi">08</span><span class="o">/</span><span class="mi">04</span> <span class="mi">05</span><span class="p">:</span><span class="mi">49</span><span class="p">:</span><span class="mi">19</span> <span class="n">host</span><span class="o">/</span><span class="n">trillium</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">COM</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<p>Depending on your host’s and realm’s configuration, you may also see a
-ticket with the service principal <code class="docutils literal notranslate"><span class="pre">host/trillium.example.com&#64;</span></code>. If
-so, this means that your host did not know what realm
-trillium.example.com is in, so it asked the <code class="docutils literal notranslate"><span class="pre">ATHENA.MIT.EDU</span></code> KDC for
-a referral. The next time you connect to <code class="docutils literal notranslate"><span class="pre">trillium.example.com</span></code>,
-the odd-looking entry will be used to avoid needing to ask for a
-referral again.</p>
-<p>You can use the <strong>-f</strong> option to view the flags that apply to your
-tickets. The flags are:</p>
-<table class="docutils align-default">
-<tbody>
-<tr class="row-odd"><td><p>F</p></td>
-<td><p>Forwardable</p></td>
-</tr>
-<tr class="row-even"><td><p>f</p></td>
-<td><p>forwarded</p></td>
-</tr>
-<tr class="row-odd"><td><p>P</p></td>
-<td><p>Proxiable</p></td>
-</tr>
-<tr class="row-even"><td><p>p</p></td>
-<td><p>proxy</p></td>
-</tr>
-<tr class="row-odd"><td><p>D</p></td>
-<td><p>postDateable</p></td>
-</tr>
-<tr class="row-even"><td><p>d</p></td>
-<td><p>postdated</p></td>
-</tr>
-<tr class="row-odd"><td><p>R</p></td>
-<td><p>Renewable</p></td>
-</tr>
-<tr class="row-even"><td><p>I</p></td>
-<td><p>Initial</p></td>
-</tr>
-<tr class="row-odd"><td><p>i</p></td>
-<td><p>invalid</p></td>
-</tr>
-<tr class="row-even"><td><p>H</p></td>
-<td><p>Hardware authenticated</p></td>
-</tr>
-<tr class="row-odd"><td><p>A</p></td>
-<td><p>preAuthenticated</p></td>
-</tr>
-<tr class="row-even"><td><p>T</p></td>
-<td><p>Transit policy checked</p></td>
-</tr>
-<tr class="row-odd"><td><p>O</p></td>
-<td><p>Okay as delegate</p></td>
-</tr>
-<tr class="row-even"><td><p>a</p></td>
-<td><p>anonymous</p></td>
-</tr>
-</tbody>
-</table>
-<p>Here is a sample listing. In this example, the user <em>jennifer</em>
-obtained her initial tickets (<strong>I</strong>), which are forwardable (<strong>F</strong>)
-and postdated (<strong>d</strong>) but not yet validated (<strong>i</strong>):</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">klist</span> <span class="o">-</span><span class="n">f</span>
-<span class="n">Ticket</span> <span class="n">cache</span><span class="p">:</span> <span class="o">/</span><span class="n">tmp</span><span class="o">/</span><span class="n">krb5cc_320</span>
-<span class="n">Default</span> <span class="n">principal</span><span class="p">:</span> <span class="n">jennifer</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
-
-<span class="n">Valid</span> <span class="n">starting</span> <span class="n">Expires</span> <span class="n">Service</span> <span class="n">principal</span>
-<span class="mi">31</span><span class="o">/</span><span class="mi">07</span><span class="o">/</span><span class="mi">05</span> <span class="mi">19</span><span class="p">:</span><span class="mi">06</span><span class="p">:</span><span class="mi">25</span> <span class="mi">31</span><span class="o">/</span><span class="mi">07</span><span class="o">/</span><span class="mi">05</span> <span class="mi">19</span><span class="p">:</span><span class="mi">16</span><span class="p">:</span><span class="mi">25</span> <span class="n">krbtgt</span><span class="o">/</span><span class="n">ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span><span class="nd">@ATHENA</span><span class="o">.</span><span class="n">MIT</span><span class="o">.</span><span class="n">EDU</span>
- <span class="n">Flags</span><span class="p">:</span> <span class="n">FdiI</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<p>In the following example, the user <em>david</em>’s tickets were forwarded
-(<strong>f</strong>) to this host from another host. The tickets are reforwardable
-(<strong>F</strong>):</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">klist</span> <span class="o">-</span><span class="n">f</span>
-<span class="n">Ticket</span> <span class="n">cache</span><span class="p">:</span> <span class="o">/</span><span class="n">tmp</span><span class="o">/</span><span class="n">krb5cc_p11795</span>
-<span class="n">Default</span> <span class="n">principal</span><span class="p">:</span> <span class="n">david</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">COM</span>
-
-<span class="n">Valid</span> <span class="n">starting</span> <span class="n">Expires</span> <span class="n">Service</span> <span class="n">principal</span>
-<span class="mi">07</span><span class="o">/</span><span class="mi">31</span><span class="o">/</span><span class="mi">05</span> <span class="mi">11</span><span class="p">:</span><span class="mi">52</span><span class="p">:</span><span class="mi">29</span> <span class="mi">07</span><span class="o">/</span><span class="mi">31</span><span class="o">/</span><span class="mi">05</span> <span class="mi">21</span><span class="p">:</span><span class="mi">11</span><span class="p">:</span><span class="mi">23</span> <span class="n">krbtgt</span><span class="o">/</span><span class="n">EXAMPLE</span><span class="o">.</span><span class="n">COM</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">COM</span>
- <span class="n">Flags</span><span class="p">:</span> <span class="n">Ff</span>
-<span class="mi">07</span><span class="o">/</span><span class="mi">31</span><span class="o">/</span><span class="mi">05</span> <span class="mi">12</span><span class="p">:</span><span class="mi">03</span><span class="p">:</span><span class="mi">48</span> <span class="mi">07</span><span class="o">/</span><span class="mi">31</span><span class="o">/</span><span class="mi">05</span> <span class="mi">21</span><span class="p">:</span><span class="mi">11</span><span class="p">:</span><span class="mi">23</span> <span class="n">host</span><span class="o">/</span><span class="n">trillium</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span><span class="nd">@EXAMPLE</span><span class="o">.</span><span class="n">COM</span>
- <span class="n">Flags</span><span class="p">:</span> <span class="n">Ff</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-</section>
-<section id="destroying-tickets-with-kdestroy">
-<h2>Destroying tickets with kdestroy<a class="headerlink" href="#destroying-tickets-with-kdestroy" title="Link to this heading">¶</a></h2>
-<p>Your Kerberos tickets are proof that you are indeed yourself, and
-tickets could be stolen if someone gains access to a computer where
-they are stored. If this happens, the person who has them can
-masquerade as you until they expire. For this reason, you should
-destroy your Kerberos tickets when you are away from your computer.</p>
-<p>Destroying your tickets is easy. Simply type kdestroy:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">kdestroy</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-<p>If <a class="reference internal" href="user_commands/kdestroy.html#kdestroy-1"><span class="std std-ref">kdestroy</span></a> fails to destroy your tickets, it will beep and
-give an error message. For example, if kdestroy can’t find any
-tickets to destroy, it will give the following message:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">shell</span><span class="o">%</span> <span class="n">kdestroy</span>
-<span class="n">kdestroy</span><span class="p">:</span> <span class="n">No</span> <span class="n">credentials</span> <span class="n">cache</span> <span class="n">file</span> <span class="n">found</span> <span class="k">while</span> <span class="n">destroying</span> <span class="n">cache</span>
-<span class="n">shell</span><span class="o">%</span>
-</pre></div>
-</div>
-</section>
-</section>
-
-
- <div class="clearer"></div>
- </div>
- </div>
- </div>
- </div>
- <div class="sidebar">
-
- <h2>On this page</h2>
- <ul>
-<li><a class="reference internal" href="#">Ticket management</a><ul>
-<li><a class="reference internal" href="#kerberos-ticket-properties">Kerberos ticket properties</a></li>
-<li><a class="reference internal" href="#obtaining-tickets-with-kinit">Obtaining tickets with kinit</a></li>
-<li><a class="reference internal" href="#viewing-tickets-with-klist">Viewing tickets with klist</a></li>
-<li><a class="reference internal" href="#destroying-tickets-with-kdestroy">Destroying tickets with kdestroy</a></li>
-</ul>
-</li>
-</ul>
-
- <br/>
- <h2>Table of contents</h2>
- <ul class="current">
-<li class="toctree-l1 current"><a class="reference internal" href="index.html">For users</a><ul class="current">
-<li class="toctree-l2"><a class="reference internal" href="pwd_mgmt.html">Password management</a></li>
-<li class="toctree-l2 current"><a class="current reference internal" href="#">Ticket management</a></li>
-<li class="toctree-l2"><a class="reference internal" href="user_config/index.html">User config files</a></li>
-<li class="toctree-l2"><a class="reference internal" href="user_commands/index.html">User commands</a></li>
-</ul>
-</li>
-<li class="toctree-l1"><a class="reference internal" href="../admin/index.html">For administrators</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../appdev/index.html">For application developers</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../plugindev/index.html">For plugin module developers</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../build/index.html">Building Kerberos V5</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../basic/index.html">Kerberos V5 concepts</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../formats/index.html">Protocols and file formats</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../mitK5features.html">MIT Kerberos features</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../build_this.html">How to build this documentation from the source</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../about.html">Contributing to the MIT Kerberos Documentation</a></li>
-<li class="toctree-l1"><a class="reference internal" href="../resources.html">Resources</a></li>
-</ul>
-
- <br/>
- <h4><a href="../index.html">Full Table of Contents</a></h4>
- <h4>Search</h4>
- <form class="search" action="../search.html" method="get">
- <input type="text" name="q" size="18" />
- <input type="submit" value="Go" />
- <input type="hidden" name="check_keywords" value="yes" />
- <input type="hidden" name="area" value="default" />
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- <div class="right" ><i>Release: 1.22-final</i><br />
- &copy; <a href="../copyright.html">Copyright</a> 1985-2025, MIT.
- </div>
- <div class="left">
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- <a href="../index.html" title="Full Table of Contents"
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