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symmetric key now transits with cookie

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This commit is contained in:
tale-fau 2023-11-06 14:26:36 +01:00
parent 817325eea4
commit 80a0104a7c
3 changed files with 33 additions and 29 deletions
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21
app.php
View file

@ -239,8 +239,11 @@ $f3->route('POST /share',
if(!$f3->get('DEBUG')) {
array_map('unlink', glob($tmpfile."*.svg"));
}
$encryptor = new CryptographyClass();
if (!isset($_COOKIE[$hash])) {
$symmetric_key = createSymmetricKey();
setcookie($hash, $symmetric_key, ['expires' => 0, 'samesite' => 'Strict', 'path' => "/"]);
}
$encryptor = new CryptographyClass($symmetric_key);
$encryptor->encrypt($hash);
$f3->reroute($f3->get('REVERSE_PROXY_URL').'/signature/'.$hash."#informations");
}
@ -253,10 +256,9 @@ $f3->route('GET /signature/@hash/pdf',
$hash = Web::instance()->slug($f3->get('PARAMS.hash'));
$sharingFolder = $f3->get('PDF_STORAGE_PATH').$hash;
$cryptor = new CryptographyClass();
$cryptor = new CryptographyClass($_COOKIE[$hash]);
$cryptor->decrypt($hash);
$files = scandir($sharingFolder);
$originalFile = $sharingFolder.'/original.pdf';
$finalFile = $sharingFolder.'/'.$f3->get('PARAMS.hash').uniqid().'.pdf';
@ -526,4 +528,15 @@ function convertPHPSizeToBytes($sSize)
return (int)$iValue;
}
function createSymmetricKey() {
$length = 15;
$keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$pieces = [];
$max = mb_strlen($keyspace, '8bit') - 1;
for ($i = 0; $i < $length; ++$i) {
$pieces []= $keyspace[random_int(0, $max)];
}
return implode('', $pieces);
}
return $f3;

38
lib/cryptography.class.php
View file

@ -2,15 +2,18 @@
class CryptographyClass
{
const KEY_SIZE = 4;
private $symmetric_key = null;
function __construct($key) {
$this->setSymmetricKey($key);
}
public function encrypt($hash) {
foreach (glob("/tmp/".$hash.'/*.pdf') as $file) {
$outputFile = $file.".gpg";
$keyPath = $this->getKeyPath();
$command = "gpg --batch --passphrase-file $keyPath --symmetric --cipher-algo AES256 -o $outputFile $file";
$key = $this->getSymmetricKey();
$command = "gpg --batch --passphrase $key --symmetric --cipher-algo AES256 -o $outputFile $file";
$result = shell_exec($command);
$this->freeKeyFile($keyPath);
if ($result === false) {
echo "Cypher failure";
exit;
@ -22,38 +25,25 @@ class CryptographyClass
public function decrypt($hash) {
foreach (glob("/tmp/".$hash.'/*.gpg') as $file) {
$outputFile = str_replace(".gpg", "", $file);
$keyPath = $this->getKeyPath();
$command = "gpg --batch --passphrase-file $keyPath --decrypt -o $outputFile $file";
$key = $this->getSymmetricKey();
$command = "gpg --batch --passphrase $key --decrypt -o $outputFile $file";
$result = shell_exec($command);
$this->freeKeyFile($keyPath);
if ($result === false) {
echo "Decypher failure";
exit;
}
unlink($file);
}
return true;
}
private function getKeyPath() {
$path = "../key.txt";
if (file_put_contents($path, 'test') === false)
{
echo "passphrase generation failure";
exit;
}
return $path;
private function getSymmetricKey() {
return $this->symmetric_key;
}
private function freeKeyFile($keyPath) {
$passphrase_overwrite = str_repeat("0", self::KEY_SIZE);
if (file_put_contents($keyPath, $passphrase_overwrite) === false)
{
echo "passphrase generation failure";
exit;
}
private function setSymmetricKey($key) {
$this->symmetric_key = $key;
}
}
?>

3
templates/signature.html.php
View file

@ -112,6 +112,7 @@
</div>
<form id="form_pdf" action="<?php echo $REVERSE_PROXY_URL; ?>/signature/<?php echo $hash ?>/save" method="post" enctype="multipart/form-data" class="d-none d-sm-none d-md-block">
<input id="input_svg" name="svg[]" type="file" class="d-none" />
<!-- <input id="symmetric_key" name="key" type="hidden" value="test" /> -->
<button class="btn btn-primary w-100 mt-2" disabled="disabled" type="submit" id="save"><i class="bi bi-cloud-upload"></i> <?php echo _("Transmit my signature"); ?></button>
</form>
<?php endif; ?>
@ -197,7 +198,7 @@
<form id="form_sharing" clas action="<?php echo $REVERSE_PROXY_URL; ?>/share" method="post" enctype="multipart/form-data">
<input id="input_pdf_share" name="pdf" type="file" class="d-none" />
<input id="input_svg_share" name="svg[]" type="file" class="d-none" />
<input id="symmetric_key" name="key" type="hidden" value="test" />
<!-- <input id="symmetric_key" name="key" type="hidden" value="test" /> -->
<button class="btn col-9 col-md-6 btn-primary" type="submit" id="save_share"><?php echo sprintf(_("%s Start sharing"), '<i class="bi bi-cloud-upload"></i>'); ?></button>
</form>
</div>