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| <div class="post-header"> |
| <h1 class="post-title-main">Access control list (ACL) - Deprecated</h1> |
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| <p>Entries in the <a href="#" data-toggle="tooltip" data-original-title="An access control list (ACL) holds the current status on who (subject) is permitted to which extent (read, write, administrate) to manage a Thing.">ACL</a> configure the |
| permissions for subjects. A subject is identified by an arbitrary ID.</p> |
| |
| <div class="alert alert-info" role="alert"><i class="fa fa-info-circle"></i> <b>Note:</b> The ACL concept is only supported for Ditto <strong>HTTP API version 1</strong>. <br /> |
| For Ditto <strong>HTTP API version 2</strong> we have introduced the <a href="basic-policy.html">Policies</a> concept.</div> |
| |
| <h2 id="authorization-subject">Authorization Subject</h2> |
| |
| <p>A <em>subject</em> can have following type of permission: read, write, administrate.</p> |
| |
| <ul> |
| <li>A subject that has <a href="basic-acl.html#read">READ</a> permission is allowed to read all data of a Thing, i.e. its Attributes, |
| Features and ACL.</li> |
| <li><a href="basic-acl.html#write">WRITE</a> permission is required to be able to set data of the Thing or to send messages to a |
| Thing or Feature.</li> |
| <li>To be able to modify the ACL itself, a subject needs <a href="basic-acl.html#administrate">ADMINISTRATE</a> permission.</li> |
| </ul> |
| |
| <p>When a Thing is initially created at least one entry of the ACL with READ, WRITE and ADMINISTRATE permission is |
| mandatory and must be provided. |
| If there is no ACL provided when creating a new Thing, a default ACL will be created. |
| The default ACL entry consists of a subject ID (e.g. the ID of the currently logged in user), and all 3 permissions.</p> |
| |
| <p>Also, there must always be at least one entry with all permissions. |
| The last entry cannot be deleted or changed to not include all permissions.</p> |
| |
| <h2 id="read">READ</h2> |
| |
| <p>Allows to read a Thing. This includes reading its ACL, Attributes, Features and their Properties.</p> |
| |
| <p>The forwarding of messages to Subscribers is also secured according to the ACL entries on the Things themselves. |
| E.g. only entities with READ permission on the Thing will be notified about changes related to that Thing and its Features.</p> |
| |
| <h2 id="write">WRITE</h2> |
| |
| <p>Allows to write/modify a Thing. |
| E.g. create/update/delete Things, Attributes, Features and their Properties, execute Feature operations.</p> |
| |
| <p>In order to send messages towards to or receive messages from a Thing one would need WRITE permission on the specific |
| Thing.</p> |
| |
| <h2 id="administrate">ADMINISTRATE</h2> |
| |
| <p>Allows to modify the ACL of a Thing and to create/modify/delete its entries according to the restrictions mentioned before.</p> |
| |
| <h2 id="example-for-an-access-control-list">Example for an Access Control List</h2> |
| |
| <p>The following example shows the ACL JSON object of a Thing.</p> |
| |
| <p>The first authorization subject is the ID of the default nginx user “ditto”. |
| The second one is the ID of another user “adam” who additionally has <code class="highlighter-rouge">WRITE</code> and <code class="highlighter-rouge">ADMINISTRATE</code> permission.</p> |
| |
| <div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="s2">"acl"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"ditto"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"READ"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"WRITE"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"ADMINISTRATE"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span><span class="w"> |
| </span><span class="p">},</span><span class="w"> |
| </span><span class="s2">"adam"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"READ"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"WRITE"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"ADMINISTRATE"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span></code></pre></div></div> |
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