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LICENSE
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LICENSE
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Copyright (C) 2023 Jack-Benny Persson <jack-benny@cyberinfo.se>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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README.md
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README.md
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# Encrypted form
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This is a small project to send encrypted form data to a recipient.
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The data is encrypted using the form recipient's PGP key.
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## Requirements
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Apache/NGINX with PHP and the GnuGP PHP module. The module is installed with
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`apt install php-gnupg` on Debian and Ubuntu systems.
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The Apache/NGINX process also needs write permission to the GnuPG home
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directory (set the GnuPG home directory in `contact.php`).
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You also need to set the following variables in `contact.php`:
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* `$recipient` (email of the form recipient)
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* `$subject` (a subject line for the email)
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* `$key` (the **public** PGP key of the recipient)
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* `$fingerprint` (the fingerprint of the public PGP key)
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contact.html
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contact.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>Contact form</title>
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</head>
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<body>
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<form action="contact.php" method="POST" name="myform" id="myform">
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<fieldset>
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<legend>Contact us</legend>
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<label for="name">Name: </label><input type="text" id="name" name="name" required>
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<label for="email">E-mail: </label><input type="email" id="email" name="_replyto" required>
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<label for="message">Message:
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</label><textarea id="message" name="message" rows="8" required></textarea>
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</fieldset>
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<br>
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<input type="submit" value="Send" name="contactform">
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</form>
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</body>
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</html>
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contact.php
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contact.php
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<?php
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// Where GnuPG should store keys and other stuff.
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// This directory must be writable by the Apache/NGINX process
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putenv('GNUPGHOME=/home/apache/gnupg');
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// The recipient email and a subject line
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$recipient = "me@example.com";
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$subject = "Encrypted form";
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//The public PGP key of the recipient
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$key = "-----BEGIN PGP PUBLIC KEY BLOCK-----
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...
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-----END PGP PUBLIC KEY BLOCK-----
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";
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// The fingerprint for the above key
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$fingerprint = "...";
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// The form data from the HTML form
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$name = trim(stripslashes(htmlspecialchars($_POST['name'])));
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$message = trim(stripslashes(htmlspecialchars($_POST['message'])));
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$email = trim(stripslashes(htmlspecialchars($_POST['_replyto'])));
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// Check that user has entered a name, an e-mail address and a message
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if (empty($name))
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{
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echo "No name provided; the message has not been sent\n";
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exit;
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}
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if (empty($email))
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{
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echo "No email provided; the mssage has not been sent\n";
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exit;
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}
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if (empty($message))
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{
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echo "No message provided; the message has not been sent\n";
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exit;
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}
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// Initialize GnuPG
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$gpg = new gnupg();
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// Import the recipient's key
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$gpg->import($key);
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// Add the key
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$gpg->addencryptkey($fingerprint);
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// Encryt the message
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$encrypted_message = $gpg->encrypt("Name: $name\nE-mail: $email\n\nMessage: $message");
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$headers = 'From: "Contact form" <info@example.com>' . "\r\n" .
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'Reply-To: info@example.com' . "\r\n" .
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'Content-Type: text/plain; charset=UTF-8' . "\r\n" .
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'X-Mailer: PHP/' . phpversion();
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// Send the mail (this requires a fully working SMTP-server on the host)
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mail($recipient, $subject, $encrypted_message, $headers);
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?>
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Your message has been sent</title>
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</head>
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<body>
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<h1>Your message has been sent</h1>
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<p>
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Thank you for your message<br>
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<strong><i>Best regards, NNN</i></strong>
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</p>
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</body>
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</html>
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