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<div id="primary" class="boxed-layout-header page-header header-small" data-parallax="active" ><div class="container"><div class="row"><div class="col-md-10 col-md-offset-1 text-center"><h1 class="hestia-title entry-title">How to decrypt flows_cred.json from NodeRED data ?</h1><h4 class="author">Published by <a href="/en/author/hugopoi/" class="vcard author"><strong class="fn">HugoPoi</strong></a> on <time class="entry-date published" datetime="2021-12-28T00:17:36+01:00" content="2021-12-28">28 December 2021</time><time class="updated hestia-hidden" datetime="2021-12-28T00:26:42+01:00">28 December 2021</time></h4></div></div></div><div class="header-filter" style="background-image: url(/wp-content/uploads/2017/06/IMG_20170528_085824.jpg);"></div></div>
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<div class="single-post-wrap entry-content"><h2>1. Digging the code</h2>
<p>The first step is to reverse the code from NodeRED, simple steps<br />
1. Clone the sources<br />
<code>git clone https://github.com/node-red/node-red.git</code><br />
2. Dig with grep in the code<br />
<code>grep -ril crypto packages/</code></p>
<pre><code class=""> packages/node_modules/@node-red/editor-api/lib/auth/index.js
packages/node_modules/@node-red/editor-api/lib/auth/strategies.js
packages/node_modules/@node-red/editor-api/lib/auth/tokens.js
packages/node_modules/@node-red/editor-api/lib/editor/comms.js
packages/node_modules/@node-red/editor-client/src/js/ui/editors/code-editors/monaco.js
packages/node_modules/@node-red/editor-client/src/types/README.md
packages/node_modules/@node-red/editor-client/src/types/node/crypto.d.ts
packages/node_modules/@node-red/editor-client/src/types/node/tls.d.ts
packages/node_modules/@node-red/editor-client/src/vendor/monaco/dist/editor.js
packages/node_modules/@node-red/editor-client/src/vendor/monaco/dist/html.worker.js
packages/node_modules/@node-red/editor-client/src/vendor/monaco/dist/ts.worker.js
packages/node_modules/@node-red/nodes/core/common/60-link.js
packages/node_modules/@node-red/nodes/core/network/21-httprequest.js
packages/node_modules/@node-red/runtime/lib/nodes/credentials.js
packages/node_modules/@node-red/runtime/lib/storage/index.js
packages/node_modules/@node-red/runtime/lib/storage/localfilesystem/projects/git/authServer.js
packages/node_modules/@node-red/runtime/lib/storage/localfilesystem/projects/index.js
packages/node_modules/node-red/red.js
</code></pre>
<ol start="3">
<li>Find the interesting parts<br />
<code>packages/node_modules/@node-red/runtime/lib/nodes/credentials.js</code> file name looks promising.</li>
</ol>
<pre><code class="language-javascript ">function decryptCredentials(key,credentials) {
var creds = credentials["$"];
var initVector = Buffer.from(creds.substring(0, 32),'hex');
creds = creds.substring(32);
var decipher = crypto.createDecipheriv(encryptionAlgorithm, key, initVector);
var decrypted = decipher.update(creds, 'base64', 'utf8') + decipher.final('utf8');
return JSON.parse(decrypted);
}
</code></pre>
<p>and</p>
<pre><code class="language-javascript "> var defaultKey;
try {
defaultKey = settings.get('_credentialSecret');
} catch(err) {
}
if (defaultKey) {
defaultKey = crypto.createHash('sha256').update(defaultKey).digest();
encryptionKeyType = "system";
}
</code></pre>
<p>and</p>
<pre><code class="language-javascript "> // Check if we have a generated _credSecret to decrypt with and remove
if (defaultKey) {
log.debug("red/runtime/nodes/credentials.load : default key present. Will migrate");
if (credentialsEncrypted) {
try {
credentials = decryptCredentials(defaultKey,credentials)
} catch(err) {
credentials = {};
log.warn(log._("nodes.credentials.error",{message:err.toString()}))
var error = new Error("Failed to decrypt credentials");
error.code = "credentials_load_failed";
throw error;
}
}
dirty = true;
removeDefaultKey = true;
}
</code></pre>
<ul>
<li>The key come from <code>_credentialSecret</code> which is in the file <code>.config.runtime.json</code></li>
<li>Then the key is hashed as sha256 and pass to <code>decryptCredentials()</code> function</li>
<li><code>decryptCredentials()</code> extract the 32 first characters and taken them as the Initial Vector</li>
<li>The end of creds string is a base64 encoded, and the content is encrypted aes</li>
</ul>
<h2>2. Openssl is a pain</h2>
<p>The command <code>openssl enc -base64 -d</code> DOESN&#8217;T DO THE SAME AS <code>base64 -d</code></p>
<p><a class="wp-editor-md-post-content-link" href="https://stackoverflow.com/questions/35289912/openssl-enc-base64-d-does-not-decode-strings-after-a-certain-length">Why ?</a></p>
<p>Because you need <code>-A</code> one line weird option.</p>
<p><code>openssl enc -base64 -d -A</code> does the same as <code>base64 -d</code></p>
<p>So if you need to decrypt a encoded base64 payload you need the -a and -A options like</p>
<p><code>openssl enc -aes-256-ctr -d -a -A</code></p>
<p>Our key is <code>jq -j '._credentialSecret' $1/.config.runtime.json | sha256sum | cut -c 1-64</code> ( pay attention to the <code>-j</code> option of <code>jq</code> command for not passing a breakline to sha256sum).</p>
<p>Our IV is <code>jq -r '.["$"]' $1/flows_cred.json | cut -c 1-32</code>.</p>
<p>And our aes data is <code>jq '.["$"]' -j $1/flows_cred.json | cut -c 33-</code>.</p>
<h2>3. Final script</h2>
<pre><code class="language-bash ">#!/bin/bash
#
# Decrypt flows_cred.json from a NodeRED data directory
#
# Usage
# ./node-red-decrypt-flows-cred.sh ./node_red_data
#
jq '.["$"]' -j $1/flows_cred.json | \
cut -c 33- | \
openssl enc -aes-256-ctr -d -base64 -A -iv `jq -r '.["$"]' $1/flows_cred.json | cut -c 1-32` -K `jq -j '._credentialSecret' $1/.config.runtime.json | sha256sum | cut -c 1-64`
</code></pre>
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This command
openssl enc -base64 -d
DOESN'T DO THE SAME AS
base64 -d
Why ?… <a href="https://t.co/9FtXX6QiJk">https://t.co/9FtXX6QiJk</a></span> <span class='entry-meta'><span class='time-meta'><a href="http://twitter.com/HugoPoi/statuses/1475419690822479875">about 12 hours ago</a></span> <span class='from-meta'>from <a href="https://crossposter.hugopoi.net/" rel="nofollow">Mastodon To Twitter HugoPoi</a></span></span> <span class="intent-meta"><a href="http://twitter.com/intent/tweet?in_reply_to=1475419690822479875" data-lang="en" class="in-reply-to" title="Reply">Reply</a><a href="http://twitter.com/intent/retweet?tweet_id=1475419690822479875" data-lang="en" class="retweet" title="Retweet">Retweet</a><a href="http://twitter.com/intent/favorite?tweet_id=1475419690822479875" data-lang="en" class="favorite" title="Favorite">Favorite</a></span></li><li><span class='entry-content'>RT <a href="http://twitter.com/NightHaunter" class="twitter-user">@NightHaunter</a>: Les enfants et la pandémie, c'est un peu comme une fable.
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<a href="https://t.co/1PQ034kJgW">https://t.co/1PQ034kJgW</a></span> <span class='entry-meta'><span class='time-meta'><a href="http://twitter.com/HugoPoi/statuses/1473333191293517827">05:43:00 PM December 21, 2021</a></span> <span class='from-meta'>from <a href="https://crossposter.hugopoi.net/" rel="nofollow">Mastodon To Twitter HugoPoi</a></span></span> <span class="intent-meta"><a href="http://twitter.com/intent/tweet?in_reply_to=1473333191293517827" data-lang="en" class="in-reply-to" title="Reply">Reply</a><a href="http://twitter.com/intent/retweet?tweet_id=1473333191293517827" data-lang="en" class="retweet" title="Retweet">Retweet</a><a href="http://twitter.com/intent/favorite?tweet_id=1473333191293517827" data-lang="en" class="favorite" title="Favorite">Favorite</a></span></li><li><span class='entry-content'>RT <a href="http://twitter.com/carm_ina" class="twitter-user">@carm_ina</a>: Allez, petit thread rapide en rapport avec les media et le traitement du porno.
Hier, une chaîne de télé m'appelle pour me f…</span> <span class='entry-meta'><span class='time-meta'><a href="http://twitter.com/HugoPoi/statuses/1471432453902544903">11:50:09 AM December 16, 2021</a></span> <span class='from-meta'>from <a href="https://about.twitter.com/products/tweetdeck" rel="nofollow">TweetDeck</a></span></span> <span class="intent-meta"><a href="http://twitter.com/intent/tweet?in_reply_to=1471432453902544903" data-lang="en" class="in-reply-to" title="Reply">Reply</a><a href="http://twitter.com/intent/retweet?tweet_id=1471432453902544903" data-lang="en" class="retweet" title="Retweet">Retweet</a><a href="http://twitter.com/intent/favorite?tweet_id=1471432453902544903" data-lang="en" class="favorite" title="Favorite">Favorite</a></span></li><li><span class='entry-content'>RT <a href="http://twitter.com/molly_struve" class="twitter-user">@molly_struve</a>: indexes can be helpful as well <a href="https://t.co/lSGnXpRqtU">https://t.co/lSGnXpRqtU</a></span> <span class='entry-meta'><span class='time-meta'><a href="http://twitter.com/HugoPoi/statuses/1470877572380643331">11:05:15 PM December 14, 2021</a></span> <span class='from-meta'>from <a href="https://github.com/TwidereProject" rel="nofollow">Twidere for Android</a></span></span> <span class="intent-meta"><a href="http://twitter.com/intent/tweet?in_reply_to=1470877572380643331" data-lang="en" class="in-reply-to" title="Reply">Reply</a><a href="http://twitter.com/intent/retweet?tweet_id=1470877572380643331" data-lang="en" class="retweet" title="Retweet">Retweet</a><a href="http://twitter.com/intent/favorite?tweet_id=1470877572380643331" data-lang="en" class="favorite" title="Favorite">Favorite</a></span></li><li><span class='entry-content'>It looks good but I think the charger is dead, only ~600mV, seems low, I read 6V is the standby output <a href="https://t.co/VP8zHZSZ31">https://t.co/VP8zHZSZ31</a></span> <span class='entry-meta'><span class='time-meta'><a href="http://twitter.com/HugoPoi/statuses/1470737097619353609">01:47:03 PM December 14, 2021</a></span> <span class='from-meta'>from <a href="https://crossposter.hugopoi.net/" rel="nofollow">Mastodon To Twitter HugoPoi</a></span></span> <span class="intent-meta"><a href="http://twitter.com/intent/tweet?in_reply_to=1470737097619353609" data-lang="en" class="in-reply-to" title="Reply">Reply</a><a href="http://twitter.com/intent/retweet?tweet_id=1470737097619353609" data-lang="en" class="retweet" title="Retweet">Retweet</a><a href="http://twitter.com/intent/favorite?tweet_id=1470737097619353609" data-lang="en" class="favorite" title="Favorite">Favorite</a></span></li><li><span class='entry-content'>RT <a href="http://twitter.com/brutofficiel" class="twitter-user">@brutofficiel</a>: "On ne peut pas dire 'J'irai en réa si je suis malade.' C'est pas possible."
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