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[stable19] avoid fread on directories and unencrypted files #27405

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[stable19] avoid fread on directories and unencrypted files #27405

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26d024c
avoid fread on directories and unencrypted files
Jan 5, 2021
50791d1
attemtp to fix test
Jan 5, 2021
bbeb3ce
2nd attempt to fix tests
Jan 5, 2021
cada36a
Update EncryptionTest.php
Jan 5, 2021
f100139
consolidation of boolean expression
Jan 16, 2021
d0a7e2c
fix brakcets
Jan 16, 2021
1c3fe81
fix even more brackets
Jan 16, 2021
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25 changes: 12 additions & 13 deletions lib/private/Files/Storage/Wrapper/Encryption.php
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Original file line number Diff line number Diff line change
Expand Up @@ -923,21 +923,20 @@ protected function getHeader($path) {
$path = $realFile;
}

$firstBlock = $this->readFirstBlock($path);
$result = $this->parseRawHeader($firstBlock);
$result = [];

// first check if it is an encrypted file at all
// We would do query to filecache only if we know that entry in filecache exists

$info = $this->getCache()->get($path);
if (isset($info['encrypted']) && $info['encrypted'] === true) {
$firstBlock = $this->readFirstBlock($path);
$result = $this->parseRawHeader($firstBlock);

// if the header doesn't contain a encryption module we check if it is a
// legacy file. If true, we add the default encryption module
if (!isset($result[Util::HEADER_ENCRYPTION_MODULE_KEY])) {
if (!empty($result)) {
// if the header doesn't contain a encryption module we check if it is a
// legacy file. If true, we add the default encryption module
if (!isset($result[Util::HEADER_ENCRYPTION_MODULE_KEY]) && (!empty($result) || $exists)) {
$result[Util::HEADER_ENCRYPTION_MODULE_KEY] = 'OC_DEFAULT_MODULE';
} elseif ($exists) {
// if the header was empty we have to check first if it is a encrypted file at all
// We would do query to filecache only if we know that entry in filecache exists
$info = $this->getCache()->get($path);
if (isset($info['encrypted']) && $info['encrypted'] === true) {
$result[Util::HEADER_ENCRYPTION_MODULE_KEY] = 'OC_DEFAULT_MODULE';
}
}
}

Expand Down
18 changes: 14 additions & 4 deletions tests/lib/Files/Storage/Wrapper/EncryptionTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -573,6 +573,14 @@ public function testGetHeader($path, $strippedPathExists, $strippedPath) {
$this->arrayCache
]
)->getMock();

$cache = $this->getMockBuilder('\OC\Files\Cache\Cache')
->disableOriginalConstructor()->getMock();
$cache->expects($this->any())
->method('get')
->willReturnCallback(function ($path) {
return ['encrypted' => true, 'path' => $path];
});

$instance = $this->getMockBuilder('\OC\Files\Storage\Wrapper\Encryption')
->setConstructorArgs(
Expand All @@ -586,9 +594,11 @@ public function testGetHeader($path, $strippedPathExists, $strippedPath) {
$this->encryptionManager, $util, $this->logger, $this->file, null, $this->keyStore, $this->update, $this->mountManager, $this->arrayCache
]
)
->setMethods(['readFirstBlock', 'parseRawHeader'])
->setMethods(['getCache','readFirstBlock', 'parseRawHeader'])
->getMock();


$instance->expects($this->once())->method('getCache')->willReturn($cache);

$instance->expects($this->once())->method(('parseRawHeader'))
->willReturn([Util::HEADER_ENCRYPTION_MODULE_KEY => 'OC_DEFAULT_MODULE']);

Expand Down Expand Up @@ -661,8 +671,8 @@ public function testGetHeaderAddLegacyModule($header, $isEncrypted, $exists, $ex
->setMethods(['readFirstBlock', 'parseRawHeader', 'getCache'])
->getMock();

$instance->expects($this->once())->method(('parseRawHeader'))->willReturn($header);
$instance->expects($this->any())->method('getCache')->willReturn($cache);
$instance->expects($this->any())->method(('parseRawHeader'))->willReturn($header);
$instance->expects($this->once())->method('getCache')->willReturn($cache);

$result = $this->invokePrivate($instance, 'getHeader', ['test.txt']);
$this->assertSameSize($expected, $result);
Expand Down