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<div class="section" id="secure-coding-guidelines">
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<h1>Secure coding guidelines<a class="headerlink" href="#secure-coding-guidelines" title="Permalink to this headline">¶</a></h1>
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<p>The platform does what it can to be secure by default and safe by design. Unfortunately the platform cannot
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prevent every kind of security mistake. This document describes what to think about when writing applications
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to block various kinds of attack. Whilst it may be tempting to just assume no reasonable counterparty would
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attempt to subvert your trades using flow level attacks, relying on trust for software security makes it
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harder to scale up your operations later when you might want to add counterparties quickly and without
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extensive vetting.</p>
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<div class="section" id="flows">
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<h2>Flows<a class="headerlink" href="#flows" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="flow-state-machines.html"><span class="doc">Writing flows</span></a> are how your app communicates with other parties on the network. Therefore they
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are the typical entry point for malicious data into your app and must be treated with care.</p>
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<p>The <code class="docutils literal"><span class="pre">receive</span></code> methods return data wrapped in the <code class="docutils literal"><span class="pre">UntrustworthyData<T></span></code> marker type. This type doesn’t add
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any functionality, it’s only there to remind you to properly validate everything that you get from the network.
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Remember that the other side may <em>not</em> be running the code you provide to take part in the flow: they are
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allowed to do anything! Things to watch out for:</p>
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<ul class="simple">
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<li>A transaction that doesn’t match a partial transaction built or proposed earlier in the flow, for instance,
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if you propose to trade a cash state worth $100 for an asset, and the transaction to sign comes back from the
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other side, you must check that it points to the state you actually requested. Otherwise the attacker could
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get you to sign a transaction that spends a much larger state to you, if they know the ID of one!</li>
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<li>A transaction that isn’t of the right type. There are two transaction types: general and notary change. If you
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are expecting one type but get the other you may find yourself signing a transaction that transfers your assets
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to the control of a hostile notary.</li>
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<li>Unexpected changes in any part of the states in a transaction. If you have access to all the needed data, you
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could re-run the builder logic and do a comparison of the resulting states to ensure that it’s what you expected.
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For instance if the data needed to construct the next state is available to both parties, the function to
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calculate the transaction you want to mutually agree could be shared between both classes implementing both
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sides of the flow.</li>
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</ul>
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<p>The theme should be clear: signing is a very sensitive operation, so you need to be sure you know what it is you
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are about to sign, and that nothing has changed in the small print!</p>
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</div>
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<div class="section" id="contracts">
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<h2>Contracts<a class="headerlink" href="#contracts" title="Permalink to this headline">¶</a></h2>
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<p>Contracts are arbitrary functions inside a JVM sandbox and therefore they have a lot of leeway to shoot themselves
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in the foot. Things to watch out for:</p>
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<ul class="simple">
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<li>Changes in states that should not be allowed by the current state transition. You will want to check that no
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fields are changing except the intended fields!</li>
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<li>Accidentally catching and discarding exceptions that might be thrown by validation logic.</li>
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<li>Calling into other contracts via virtual methods if you don’t know what those other contracts are or might do.</li>
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</ul>
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