mirror of
https://github.com/moparisthebest/mailiverse
synced 2024-11-18 23:15:03 -05:00
92 lines
3.7 KiB
HTML
92 lines
3.7 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>How {##TITLE##} Works - {##TITLE##}</title>
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<LINK_META>
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<link rel="stylesheet" type="text/css" href="rev/__VERSION__/learnmore.css">
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</head>
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<body>
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<div class="container">
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<h1>How {##TITLE##} Works: Technical Version<span class="version">(__VERSION__)</span></h1>
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<h2>Server</h2>
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<h3>Receiving mail from an external source</h3>
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When mail is received from an external source it is accepted using an SSL connection
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manufactured via an authority issued SSL certificate.
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<p>
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We must use an authority based SSL certificate
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as option, because some mail servers (hotmail,others) refuse to deliver mail when the SSL certificate
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has been self generated.
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<p>
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In the future, we will set up another mail receiving server which does not use an authority issued SSL certificate.
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All external mail will first attempt on the non authority issued SSL certificate.
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<p>
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For the time being, the second non authority based SSL certificate server does not exist.
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We will update this page when it does.
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<h3>Receiving mail from an internal source (two internal users mailing each other)</h3>
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When mail is sent from one user to another, the mail never passes through an external server.
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It also is sent to our server using an RSA public key which we have created privately.
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<p>
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Mail from one internal user to another never passes through an external network unencrypted, or encrypted using any
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authority issued encryption key.
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<h3>Writing mail</h3>
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When mail is received by our server, whether internally or externally, the server
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looks up the client's RSA PublicKey, encrypts (RSA-AES-CBC-256-EmbedIV)
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the mail and writes it to the user's store.
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<p>
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Because of performance problems surrounding the javascript client parsing actual Mime messages,
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the server also parses the mail into a JSON container, encrypts the JSON string with the RSA PublicKey
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(RSA-AES-CBC-256-EmbedIV) and writes that as well to the user's store.
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<h2>Client</h2>
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<h3>Sign up</h3>
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The javascript client creates all of the RSA keys and configuration locally.<br/>
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It also uses the user's password to generate a
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VerificationKey and CryptoKey [PKDF2-HMAC-SHA256,#iter=131072,kl=256,public salts].
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<p>
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In order to transfer the VerificationKey the client uses an RSA Public Key we have
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created privately. The VerificationKey never is transmitted plain text or encrypted with an
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authority issued encryption key.
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<p>
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The client block is first encrypted using the CryptoKey and then
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transfered to the server using an SRP encrypted connection based on the VerificationKey.
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<h3>Login</h3>
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The javascript client logs into our server using SRP. (SRP provides protection from MIM attacks.)
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<ul>
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<li>Use password to generate VerificationKey and CryptoKey [PKDF2-HMAC-SHA256,#iter=131072,kl=256,public salts]</li>
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<li>Use the VerificationKey as the password for SRP authentication</li>
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<li>Use the CryptorKey to decrypt the user block (AES-CBC-256-EmbedIV)</li>
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<li>Obtain the user RSA KeyPair from the decrypted block</li>
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</ul>
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<h3>Parsing Mail</h3>
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The client uses the RSA Private Key to decrypt (RSA-AES-CBC-256-EmbedIV) json container mail stored on
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the user's storage. It then creates cache files to allow information to be more quickly loaded.
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<p>
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These cache files are encrypted (AES-CBC-256-EmbedIV) with an AES key, generated from
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a combination of a secret seed and the file name.
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<h2>iOS Client</h2>
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The iOS client works exactly like the web client. No caches are stored on the device.
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<footer>
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<p>© {##COMPANY##} __THIS_YEAR__</p>
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</footer>
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</div>
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</body>
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</html>
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