D16127.diff
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	diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
	--- a/src/__phutil_library_map__.php
	+++ b/src/__phutil_library_map__.php
	@@ -2524,7 +2524,10 @@
	'PhabricatorFilesConfigOptions' => 'applications/files/config/PhabricatorFilesConfigOptions.php',
	'PhabricatorFilesManagementCatWorkflow' => 'applications/files/management/PhabricatorFilesManagementCatWorkflow.php',
	'PhabricatorFilesManagementCompactWorkflow' => 'applications/files/management/PhabricatorFilesManagementCompactWorkflow.php',
	+ 'PhabricatorFilesManagementCycleWorkflow' => 'applications/files/management/PhabricatorFilesManagementCycleWorkflow.php',
	+ 'PhabricatorFilesManagementEncodeWorkflow' => 'applications/files/management/PhabricatorFilesManagementEncodeWorkflow.php',
	'PhabricatorFilesManagementEnginesWorkflow' => 'applications/files/management/PhabricatorFilesManagementEnginesWorkflow.php',
	+ 'PhabricatorFilesManagementGenerateKeyWorkflow' => 'applications/files/management/PhabricatorFilesManagementGenerateKeyWorkflow.php',
	'PhabricatorFilesManagementMigrateWorkflow' => 'applications/files/management/PhabricatorFilesManagementMigrateWorkflow.php',
	'PhabricatorFilesManagementPurgeWorkflow' => 'applications/files/management/PhabricatorFilesManagementPurgeWorkflow.php',
	'PhabricatorFilesManagementRebuildWorkflow' => 'applications/files/management/PhabricatorFilesManagementRebuildWorkflow.php',
	@@ -2627,6 +2630,8 @@
	'PhabricatorJiraIssueHasObjectEdgeType' => 'applications/doorkeeper/edge/PhabricatorJiraIssueHasObjectEdgeType.php',
	'PhabricatorJumpNavHandler' => 'applications/search/engine/PhabricatorJumpNavHandler.php',
	'PhabricatorKeyValueDatabaseCache' => 'applications/cache/PhabricatorKeyValueDatabaseCache.php',
	+ 'PhabricatorKeyring' => 'applications/files/keyring/PhabricatorKeyring.php',
	+ 'PhabricatorKeyringConfigOptionType' => 'applications/files/keyring/PhabricatorKeyringConfigOptionType.php',
	'PhabricatorLDAPAuthProvider' => 'applications/auth/provider/PhabricatorLDAPAuthProvider.php',
	'PhabricatorLegalpadApplication' => 'applications/legalpad/application/PhabricatorLegalpadApplication.php',
	'PhabricatorLegalpadConfigOptions' => 'applications/legalpad/config/PhabricatorLegalpadConfigOptions.php',
	@@ -7173,7 +7178,10 @@
	'PhabricatorFilesConfigOptions' => 'PhabricatorApplicationConfigOptions',
	'PhabricatorFilesManagementCatWorkflow' => 'PhabricatorFilesManagementWorkflow',
	'PhabricatorFilesManagementCompactWorkflow' => 'PhabricatorFilesManagementWorkflow',
	+ 'PhabricatorFilesManagementCycleWorkflow' => 'PhabricatorFilesManagementWorkflow',
	+ 'PhabricatorFilesManagementEncodeWorkflow' => 'PhabricatorFilesManagementWorkflow',
	'PhabricatorFilesManagementEnginesWorkflow' => 'PhabricatorFilesManagementWorkflow',
	+ 'PhabricatorFilesManagementGenerateKeyWorkflow' => 'PhabricatorFilesManagementWorkflow',
	'PhabricatorFilesManagementMigrateWorkflow' => 'PhabricatorFilesManagementWorkflow',
	'PhabricatorFilesManagementPurgeWorkflow' => 'PhabricatorFilesManagementWorkflow',
	'PhabricatorFilesManagementRebuildWorkflow' => 'PhabricatorFilesManagementWorkflow',
	@@ -7283,6 +7291,8 @@
	'PhabricatorJiraIssueHasObjectEdgeType' => 'PhabricatorEdgeType',
	'PhabricatorJumpNavHandler' => 'Phobject',
	'PhabricatorKeyValueDatabaseCache' => 'PhutilKeyValueCache',
	+ 'PhabricatorKeyring' => 'Phobject',
	+ 'PhabricatorKeyringConfigOptionType' => 'PhabricatorConfigJSONOptionType',
	'PhabricatorLDAPAuthProvider' => 'PhabricatorAuthProvider',
	'PhabricatorLegalpadApplication' => 'PhabricatorApplication',
	'PhabricatorLegalpadConfigOptions' => 'PhabricatorApplicationConfigOptions',
	diff --git a/src/applications/config/option/PhabricatorSecurityConfigOptions.php b/src/applications/config/option/PhabricatorSecurityConfigOptions.php
	--- a/src/applications/config/option/PhabricatorSecurityConfigOptions.php
	+++ b/src/applications/config/option/PhabricatorSecurityConfigOptions.php
	@@ -43,6 +43,14 @@
	'255.255.255.255/32',
	);

	+ $keyring_type = 'custom:PhabricatorKeyringConfigOptionType';
	+ $keyring_description = $this->deformat(pht(<<<EOTEXT
	+The keyring stores master encryption keys. For help with configuring a keyring
	+and encryption, see [[ %s \| Configuring Encryption ]].
	+EOTEXT
	+ ,
	+ PhabricatorEnv::getDoclink('Configuring Encryption')));
	+
	return array(
	$this->newOption('security.alternate-file-domain', 'string', null)
	->setLocked(true)
	@@ -276,6 +284,10 @@
	'unsecured content over plain HTTP. It is very difficult to '.
	'undo this change once users\' browsers have accepted the '.
	'setting.')),
	+ $this->newOption('keyring', $keyring_type, array())
	+ ->setHidden(true)
	+ ->setSummary(pht('Configure master encryption keys.'))
	+ ->setDescription($keyring_description),
	);
	}

	diff --git a/src/applications/files/format/PhabricatorFileAES256StorageFormat.php b/src/applications/files/format/PhabricatorFileAES256StorageFormat.php
	--- a/src/applications/files/format/PhabricatorFileAES256StorageFormat.php
	+++ b/src/applications/files/format/PhabricatorFileAES256StorageFormat.php
	@@ -9,12 +9,31 @@
	const FORMATKEY = 'aes-256-cbc';

	private $keyName;
	- private static $keyRing = array();

	public function getStorageFormatName() {
	return pht('Encrypted (AES-256-CBC)');
	}

	+ public function canGenerateNewKeyMaterial() {
	+ return true;
	+ }
	+
	+ public function generateNewKeyMaterial() {
	+ $envelope = self::newAES256Key();
	+ $material = $envelope->openEnvelope();
	+ return base64_encode($material);
	+ }
	+
	+ public function canCycleMasterKey() {
	+ return true;
	+ }
	+
	+ public function cycleStorageProperties() {
	+ $file = $this->getFile();
	+ list($key, $iv) = $this->extractKeyAndIV($file);
	+ return $this->formatStorageProperties($key, $iv);
	+ }
	+
	public function newReadIterator($raw_iterator) {
	$file = $this->getFile();
	$data = $file->loadDataFromIterator($raw_iterator);
	@@ -42,6 +61,13 @@
	$key_envelope = self::newAES256Key();
	$iv_envelope = self::newAES256IV();

	+ return $this->formatStorageProperties($key_envelope, $iv_envelope);
	+ }
	+
	+ private function formatStorageProperties(
	+ PhutilOpaqueEnvelope $key_envelope,
	+ PhutilOpaqueEnvelope $iv_envelope) {
	+
	// Encode the raw binary data with base64 so we can wrap it in JSON.
	$data = array(
	'iv.base64' => base64_encode($iv_envelope->openEnvelope()),
	@@ -54,7 +80,7 @@
	// Encrypt the block key with the master key, using a unique IV.
	$data_iv = self::newAES256IV();
	$key_name = $this->getMasterKeyName();
	- $master_key = self::getMasterKeyFromKeyRing($key_name);
	+ $master_key = $this->getMasterKeyMaterial($key_name);
	$data_cipher = $this->encryptData($data_clear, $master_key, $data_iv);

	return array(
	@@ -73,7 +99,7 @@
	$outer_payload = base64_decode($outer_payload);

	$outer_key_name = $file->getStorageProperty('key.name');
	- $outer_key = self::getMasterKeyFromKeyRing($outer_key_name);
	+ $outer_key = $this->getMasterKeyMaterial($outer_key_name);

	$payload = $this->decryptData($outer_payload, $outer_key, $outer_iv);
	$payload = phutil_json_decode($payload);
	@@ -142,35 +168,32 @@
	return new PhutilOpaqueEnvelope($iv);
	}

	- public function selectKey($key_name) {
	+ public function selectMasterKey($key_name) {
	// Require that the key exist on the key ring.
	- self::getMasterKeyFromKeyRing($key_name);
	+ $this->getMasterKeyMaterial($key_name);

	$this->keyName = $key_name;
	return $this;
	}

	- public static function addKeyToKeyRing($name, PhutilOpaqueEnvelope $key) {
	- self::$keyRing[$name] = $key;
	- }
	-
	private function getMasterKeyName() {
	- if ($this->keyName === null) {
	- throw new Exception(pht('No master key selected for AES256 storage.'));
	+ if ($this->keyName !== null) {
	+ return $this->keyName;
	}

	- return $this->keyName;
	- }
	-
	- private static function getMasterKeyFromKeyRing($key_name) {
	- if (!isset(self::$keyRing[$key_name])) {
	- throw new Exception(
	- pht(
	- 'No master key "%s" exists in key ring for AES256 storage.',
	- $key_name));
	+ $default = PhabricatorKeyring::getDefaultKeyName(self::FORMATKEY);
	+ if ($default !== null) {
	+ return $default;
	}

	- return self::$keyRing[$key_name];
	+ throw new Exception(
	+ pht(
	+ 'No AES256 key is specified in the keyring as a default encryption '.
	+ 'key, and no encryption key has been explicitly selected.'));
	+ }
	+
	+ private function getMasterKeyMaterial($key_name) {
	+ return PhabricatorKeyring::getKey($key_name, self::FORMATKEY);
	}

	}
	diff --git a/src/applications/files/format/PhabricatorFileStorageFormat.php b/src/applications/files/format/PhabricatorFileStorageFormat.php
	--- a/src/applications/files/format/PhabricatorFileStorageFormat.php
	+++ b/src/applications/files/format/PhabricatorFileStorageFormat.php
	@@ -26,6 +26,29 @@
	return array();
	}

	+ public function canGenerateNewKeyMaterial() {
	+ return false;
	+ }
	+
	+ public function generateNewKeyMaterial() {
	+ throw new PhutilMethodNotImplementedException();
	+ }
	+
	+ public function canCycleMasterKey() {
	+ return false;
	+ }
	+
	+ public function cycleStorageProperties() {
	+ throw new PhutilMethodNotImplementedException();
	+ }
	+
	+ public function selectMasterKey($key_name) {
	+ throw new Exception(
	+ pht(
	+ 'This storage format ("%s") does not support key selection.',
	+ $this->getStorageFormatName()));
	+ }
	+
	final public function getStorageFormatKey() {
	return $this->getPhobjectClassConstant('FORMATKEY');
	}
	diff --git a/src/applications/files/format/__tests__/PhabricatorFileStorageFormatTestCase.php b/src/applications/files/format/__tests__/PhabricatorFileStorageFormatTestCase.php
	--- a/src/applications/files/format/__tests__/PhabricatorFileStorageFormatTestCase.php
	+++ b/src/applications/files/format/__tests__/PhabricatorFileStorageFormatTestCase.php
	@@ -39,12 +39,17 @@
	$engine = new PhabricatorTestStorageEngine();

	$key_name = 'test.abcd';
	- $key_text = new PhutilOpaqueEnvelope('abcdefghijklmnopABCDEFGHIJKLMNOP');
	+ $key_text = 'abcdefghijklmnopABCDEFGHIJKLMNOP';

	- PhabricatorFileAES256StorageFormat::addKeyToKeyRing($key_name, $key_text);
	+ PhabricatorKeyring::addKey(
	+ array(
	+ 'name' => $key_name,
	+ 'type' => 'aes-256-cbc',
	+ 'material.base64' => base64_encode($key_text),
	+ ));

	$format = id(new PhabricatorFileAES256StorageFormat())
	- ->selectKey($key_name);
	+ ->selectMasterKey($key_name);

	$data = 'The cow jumped over the full moon.';

	diff --git a/src/applications/files/keyring/PhabricatorKeyring.php b/src/applications/files/keyring/PhabricatorKeyring.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/files/keyring/PhabricatorKeyring.php
	@@ -0,0 +1,52 @@
	+<?php
	+
	+final class PhabricatorKeyring extends Phobject {
	+
	+ private static $hasReadConfiguration;
	+ private static $keyRing = array();
	+
	+ public static function addKey($spec) {
	+ self::$keyRing[$spec['name']] = $spec;
	+ }
	+
	+ public static function getKey($name, $type) {
	+ self::readConfiguration();
	+
	+ if (empty(self::$keyRing[$name])) {
	+ throw new Exception(
	+ pht(
	+ 'No key "%s" exists in keyring.',
	+ $name));
	+ }
	+
	+ $spec = self::$keyRing[$name];
	+
	+ $material = base64_decode($spec['material.base64'], true);
	+ return new PhutilOpaqueEnvelope($material);
	+ }
	+
	+ public static function getDefaultKeyName($type) {
	+ self::readConfiguration();
	+
	+ foreach (self::$keyRing as $name => $key) {
	+ if (!empty($key['default'])) {
	+ return $name;
	+ }
	+ }
	+
	+ return null;
	+ }
	+
	+ private static function readConfiguration() {
	+ if (self::$hasReadConfiguration) {
	+ return true;
	+ }
	+
	+ self::$hasReadConfiguration = true;
	+
	+ foreach (PhabricatorEnv::getEnvConfig('keyring') as $spec) {
	+ self::addKey($spec);
	+ }
	+ }
	+
	+}
	diff --git a/src/applications/files/keyring/PhabricatorKeyringConfigOptionType.php b/src/applications/files/keyring/PhabricatorKeyringConfigOptionType.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/files/keyring/PhabricatorKeyringConfigOptionType.php
	@@ -0,0 +1,111 @@
	+<?php
	+
	+final class PhabricatorKeyringConfigOptionType
	+ extends PhabricatorConfigJSONOptionType {
	+
	+ public function validateOption(PhabricatorConfigOption $option, $value) {
	+ if (!is_array($value)) {
	+ throw new Exception(
	+ pht(
	+ 'Keyring configuration is not valid: value must be a '.
	+ 'list of encryption keys.'));
	+ }
	+
	+ foreach ($value as $index => $spec) {
	+ if (!is_array($spec)) {
	+ throw new Exception(
	+ pht(
	+ 'Keyring configuration is not valid: each entry in the list must '.
	+ 'be a dictionary describing an encryption key, but the value '.
	+ 'with index "%s" is not a dictionary.',
	+ $index));
	+ }
	+ }
	+
	+
	+ $map = array();
	+ $defaults = array();
	+ foreach ($value as $index => $spec) {
	+ try {
	+ PhutilTypeSpec::checkMap(
	+ $spec,
	+ array(
	+ 'name' => 'string',
	+ 'type' => 'string',
	+ 'material.base64' => 'string',
	+ 'default' => 'optional bool',
	+ ));
	+ } catch (Exception $ex) {
	+ throw new Exception(
	+ pht(
	+ 'Keyring configuration has an invalid key specification (at '.
	+ 'index "%s"): %s.',
	+ $index,
	+ $ex->getMessage()));
	+ }
	+
	+ $name = $spec['name'];
	+ if (isset($map[$name])) {
	+ throw new Exception(
	+ pht(
	+ 'Keyring configuration is invalid: it describes multiple keys '.
	+ 'with the same name ("%s"). Each key must have a unique name.',
	+ $name));
	+ }
	+ $map[$name] = true;
	+
	+ if (idx($spec, 'default')) {
	+ $defaults[] = $name;
	+ }
	+
	+ $type = $spec['type'];
	+ switch ($type) {
	+ case 'aes-256-cbc':
	+ if (!function_exists('openssl_encrypt')) {
	+ throw new Exception(
	+ pht(
	+ 'Keyring is configured with a "%s" key, but the PHP OpenSSL '.
	+ 'extension is not installed. Install the OpenSSL extension '.
	+ 'to enable encryption.',
	+ $type));
	+ }
	+
	+ $material = $spec['material.base64'];
	+ $material = base64_decode($material, true);
	+ if ($material === false) {
	+ throw new Exception(
	+ pht(
	+ 'Keyring specifies an invalid key ("%s"): key material '.
	+ 'should be base64 encoded.',
	+ $name));
	+ }
	+
	+ if (strlen($material) != 32) {
	+ throw new Exception(
	+ pht(
	+ 'Keyring specifies an invalid key ("%s"): key material '.
	+ 'should be 32 bytes (256 bits) but has length %s.',
	+ $name,
	+ new PhutilNumber(strlen($material))));
	+ }
	+ break;
	+ default:
	+ throw new Exception(
	+ pht(
	+ 'Keyring configuration is invalid: it describes a key with '.
	+ 'type "%s", but this type is unknown.',
	+ $type));
	+ }
	+ }
	+
	+ if (count($defaults) > 1) {
	+ throw new Exception(
	+ pht(
	+ 'Keyring configuration is invalid: it describes multiple default '.
	+ 'encryption keys. No more than one key may be the default key. '.
	+ 'Keys currently configured as defaults: %s.',
	+ implode(', ', $defaults)));
	+ }
	+ }
	+
	+}
	diff --git a/src/applications/files/management/PhabricatorFilesManagementCycleWorkflow.php b/src/applications/files/management/PhabricatorFilesManagementCycleWorkflow.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/files/management/PhabricatorFilesManagementCycleWorkflow.php
	@@ -0,0 +1,132 @@
	+<?php
	+
	+final class PhabricatorFilesManagementCycleWorkflow
	+ extends PhabricatorFilesManagementWorkflow {
	+
	+ protected function didConstruct() {
	+ $this
	+ ->setName('cycle')
	+ ->setSynopsis(
	+ pht('Cycle master key for encrypted files.'))
	+ ->setArguments(
	+ array(
	+ array(
	+ 'name' => 'key',
	+ 'param' => 'keyname',
	+ 'help' => pht('Select a specific storage key to cycle to.'),
	+ ),
	+ array(
	+ 'name' => 'all',
	+ 'help' => pht('Change encoding for all files.'),
	+ ),
	+ array(
	+ 'name' => 'names',
	+ 'wildcard' => true,
	+ ),
	+ ));
	+ }
	+
	+ public function execute(PhutilArgumentParser $args) {
	+ $iterator = $this->buildIterator($args);
	+ if (!$iterator) {
	+ throw new PhutilArgumentUsageException(
	+ pht(
	+ 'Either specify a list of files to cycle, or use --all to cycle '.
	+ 'all files.'));
	+ }
	+
	+ $format_map = PhabricatorFileStorageFormat::getAllFormats();
	+ $engines = PhabricatorFileStorageEngine::loadAllEngines();
	+
	+ $key_name = $args->getArg('key');
	+
	+ $failed = array();
	+ foreach ($iterator as $file) {
	+ $monogram = $file->getMonogram();
	+
	+ $engine_key = $file->getStorageEngine();
	+ $engine = idx($engines, $engine_key);
	+
	+ if (!$engine) {
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ '%s: Uses unknown storage engine "%s".',
	+ $monogram,
	+ $engine_key));
	+ $failed[] = $file;
	+ continue;
	+ }
	+
	+ if ($engine->isChunkEngine()) {
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ '%s: Stored as chunks, declining to cycle directly.',
	+ $monogram));
	+ continue;
	+ }
	+
	+ $format_key = $file->getStorageFormat();
	+ if (empty($format_map[$format_key])) {
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ '%s: Uses unknown storage format "%s".',
	+ $monogram,
	+ $format_key));
	+ $failed[] = $file;
	+ continue;
	+ }
	+
	+ $format = clone $format_map[$format_key];
	+ $format->setFile($file);
	+
	+ if (!$format->canCycleMasterKey()) {
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ '%s: Storage format ("%s") does not support key cycling.',
	+ $monogram,
	+ $format->getStorageFormatName()));
	+ continue;
	+ }
	+
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ '%s: Cycling master key.',
	+ $monogram));
	+
	+ try {
	+ if ($key_name) {
	+ $format->selectMasterKey($key_name);
	+ }
	+
	+ $file->cycleMasterStorageKey($format);
	+
	+ echo tsprintf(
	+ "%s\n",
	+ pht('Done.'));
	+ } catch (Exception $ex) {
	+ echo tsprintf(
	+ "%B\n",
	+ pht('Failed! %s', (string)$ex));
	+ $failed[] = $file;
	+ }
	+ }
	+
	+ if ($failed) {
	+ $monograms = mpull($failed, 'getMonogram');
	+
	+ echo tsprintf(
	+ "%s\n",
	+ pht('Failures: %s.', implode(', ', $monograms)));
	+
	+ return 1;
	+ }
	+
	+ return 0;
	+ }
	+
	+}
	diff --git a/src/applications/files/management/PhabricatorFilesManagementEncodeWorkflow.php b/src/applications/files/management/PhabricatorFilesManagementEncodeWorkflow.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/files/management/PhabricatorFilesManagementEncodeWorkflow.php
	@@ -0,0 +1,151 @@
	+<?php
	+
	+final class PhabricatorFilesManagementEncodeWorkflow
	+ extends PhabricatorFilesManagementWorkflow {
	+
	+ protected function didConstruct() {
	+ $this
	+ ->setName('encode')
	+ ->setSynopsis(
	+ pht('Change the storage encoding of files.'))
	+ ->setArguments(
	+ array(
	+ array(
	+ 'name' => 'as',
	+ 'param' => 'format',
	+ 'help' => pht('Select the storage format to use.'),
	+ ),
	+ array(
	+ 'name' => 'key',
	+ 'param' => 'keyname',
	+ 'help' => pht('Select a specific storage key.'),
	+ ),
	+ array(
	+ 'name' => 'all',
	+ 'help' => pht('Change encoding for all files.'),
	+ ),
	+ array(
	+ 'name' => 'force',
	+ 'help' => pht(
	+ 'Re-encode files which are already stored in the target '.
	+ 'encoding.'),
	+ ),
	+ array(
	+ 'name' => 'names',
	+ 'wildcard' => true,
	+ ),
	+ ));
	+ }
	+
	+ public function execute(PhutilArgumentParser $args) {
	+ $iterator = $this->buildIterator($args);
	+ if (!$iterator) {
	+ throw new PhutilArgumentUsageException(
	+ pht(
	+ 'Either specify a list of files to encode, or use --all to '.
	+ 'encode all files.'));
	+ }
	+
	+ $force = (bool)$args->getArg('force');
	+
	+ $format_list = PhabricatorFileStorageFormat::getAllFormats();
	+ $format_list = array_keys($format_list);
	+ $format_list = implode(', ', $format_list);
	+
	+ $format_key = $args->getArg('as');
	+ if (!strlen($format_key)) {
	+ throw new PhutilArgumentUsageException(
	+ pht(
	+ 'Use --as <format> to select a target encoding format. Available '.
	+ 'formats are: %s.',
	+ $format_list));
	+ }
	+
	+ $format = PhabricatorFileStorageFormat::getFormat($format_key);
	+ if (!$format) {
	+ throw new PhutilArgumentUsageException(
	+ pht(
	+ 'Storage format "%s" is not valid. Available formats are: %s.',
	+ $format_key,
	+ $format_list));
	+ }
	+
	+ $key_name = $args->getArg('key');
	+ if (strlen($key_name)) {
	+ $format->selectMasterKey($key_name);
	+ }
	+
	+ $engines = PhabricatorFileStorageEngine::loadAllEngines();
	+
	+ $failed = array();
	+ foreach ($iterator as $file) {
	+ $monogram = $file->getMonogram();
	+
	+ $engine_key = $file->getStorageEngine();
	+ $engine = idx($engines, $engine_key);
	+
	+ if (!$engine) {
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ '%s: Uses unknown storage engine "%s".',
	+ $monogram,
	+ $engine_key));
	+ $failed[] = $file;
	+ continue;
	+ }
	+
	+ if ($engine->isChunkEngine()) {
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ '%s: Stored as chunks, no data to encode directly.',
	+ $monogram));
	+ continue;
	+ }
	+
	+ if (($file->getStorageFormat() == $format_key) && !$force) {
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ '%s: Already encoded in target format.',
	+ $monogram));
	+ continue;
	+ }
	+
	+ echo tsprintf(
	+ "%s\n",
	+ pht(
	+ '%s: Changing encoding from "%s" to "%s".',
	+ $monogram,
	+ $file->getStorageFormat(),
	+ $format_key));
	+
	+ try {
	+ $file->migrateToStorageFormat($format);
	+
	+ echo tsprintf(
	+ "%s\n",
	+ pht('Done.'));
	+ } catch (Exception $ex) {
	+ echo tsprintf(
	+ "%B\n",
	+ pht('Failed! %s', (string)$ex));
	+ $failed[] = $file;
	+ }
	+ }
	+
	+ if ($failed) {
	+ $monograms = mpull($failed, 'getMonogram');
	+
	+ echo tsprintf(
	+ "%s\n",
	+ pht('Failures: %s.', implode(', ', $monograms)));
	+
	+ return 1;
	+ }
	+
	+ return 0;
	+ }
	+
	+}
	diff --git a/src/applications/files/management/PhabricatorFilesManagementGenerateKeyWorkflow.php b/src/applications/files/management/PhabricatorFilesManagementGenerateKeyWorkflow.php
	new file mode 100644
	--- /dev/null
	+++ b/src/applications/files/management/PhabricatorFilesManagementGenerateKeyWorkflow.php
	@@ -0,0 +1,63 @@
	+<?php
	+
	+final class PhabricatorFilesManagementGenerateKeyWorkflow
	+ extends PhabricatorFilesManagementWorkflow {
	+
	+ protected function didConstruct() {
	+ $this
	+ ->setName('generate-key')
	+ ->setSynopsis(
	+ pht('Generate an encryption key.'))
	+ ->setArguments(
	+ array(
	+ array(
	+ 'name' => 'type',
	+ 'param' => 'keytype',
	+ 'help' => pht('Select the type of key to generate.'),
	+ ),
	+ ));
	+ }
	+
	+ public function execute(PhutilArgumentParser $args) {
	+ $type = $args->getArg('type');
	+ if (!strlen($type)) {
	+ throw new PhutilArgumentUsageException(
	+ pht(
	+ 'Specify the type of key to generate with --type.'));
	+ }
	+
	+ $format = PhabricatorFileStorageFormat::getFormat($type);
	+ if (!$format) {
	+ throw new PhutilArgumentUsageException(
	+ pht(
	+ 'No key type "%s" exists.',
	+ $type));
	+ }
	+
	+ if (!$format->canGenerateNewKeyMaterial()) {
	+ throw new PhutilArgumentUsageException(
	+ pht(
	+ 'Storage format "%s" can not generate keys.',
	+ $format->getStorageFormatName()));
	+ }
	+
	+ $material = $format->generateNewKeyMaterial();
	+
	+ $structure = array(
	+ 'name' => 'generated-key-'.Filesystem::readRandomCharacters(12),
	+ 'type' => $type,
	+ 'material.base64' => $material,
	+ );
	+
	+ $json = id(new PhutilJSON())->encodeFormatted($structure);
	+
	+ echo tsprintf(
	+ "%s: %s\n\n%B\n",
	+ pht('Key Material'),
	+ $format->getStorageFormatName(),
	+ $json);
	+
	+ return 0;
	+ }
	+
	+}
	diff --git a/src/applications/files/storage/PhabricatorFile.php b/src/applications/files/storage/PhabricatorFile.php
	--- a/src/applications/files/storage/PhabricatorFile.php
	+++ b/src/applications/files/storage/PhabricatorFile.php
	@@ -326,7 +326,13 @@

	$file = self::initializeNewFile();

	- $default_key = PhabricatorFileRawStorageFormat::FORMATKEY;
	+ $aes_type = PhabricatorFileAES256StorageFormat::FORMATKEY;
	+ $has_aes = PhabricatorKeyring::getDefaultKeyName($aes_type);
	+ if ($has_aes !== null) {
	+ $default_key = PhabricatorFileAES256StorageFormat::FORMATKEY;
	+ } else {
	+ $default_key = PhabricatorFileRawStorageFormat::FORMATKEY;
	+ }
	$key = idx($params, 'format', $default_key);

	// Callers can pass in an object explicitly instead of a key. This is
	@@ -444,6 +450,53 @@
	return $this;
	}

	+ public function migrateToStorageFormat(PhabricatorFileStorageFormat $format) {
	+ if (!$this->getID() \|\| !$this->getStorageHandle()) {
	+ throw new Exception(
	+ pht("You can not migrate a file which hasn't yet been saved."));
	+ }
	+
	+ $data = $this->loadFileData();
	+ $params = array(
	+ 'name' => $this->getName(),
	+ );
	+
	+ $engine = $this->instantiateStorageEngine();
	+ $old_handle = $this->getStorageHandle();
	+
	+ $properties = $format->newStorageProperties();
	+ $this->setStorageFormat($format->getStorageFormatKey());
	+ $this->setStorageProperties($properties);
	+
	+ list($identifier, $new_handle) = $this->writeToEngine(
	+ $engine,
	+ $data,
	+ $params);
	+
	+ $this->setStorageHandle($new_handle);
	+ $this->save();
	+
	+ $this->deleteFileDataIfUnused(
	+ $engine,
	+ $identifier,
	+ $old_handle);
	+
	+ return $this;
	+ }
	+
	+ public function cycleMasterStorageKey(PhabricatorFileStorageFormat $format) {
	+ if (!$this->getID() \|\| !$this->getStorageHandle()) {
	+ throw new Exception(
	+ pht("You can not cycle keys for a file which hasn't yet been saved."));
	+ }
	+
	+ $properties = $format->cycleStorageProperties();
	+ $this->setStorageProperties($properties);
	+ $this->save();
	+
	+ return $this;
	+ }
	+
	private function writeToEngine(
	PhabricatorFileStorageEngine $engine,
	$data,
	diff --git a/src/docs/user/configuration/configuring_encryption.diviner b/src/docs/user/configuration/configuring_encryption.diviner
	new file mode 100644
	--- /dev/null
	+++ b/src/docs/user/configuration/configuring_encryption.diviner
	@@ -0,0 +1,196 @@
	+@title Configuring Encryption
	+@group config
	+
	+Setup guide for configuring encryption.
	+
	+Overview
	+========
	+
	+Phabricator supports at-rest encryption of uploaded file data stored in the
	+"Files" application.
	+
	+Configuring at-rest file data encryption does not encrypt any other data or
	+resources. In particular, it does not encrypt the database and does not encrypt
	+Passphrase credentials.
	+
	+Attackers who compromise a Phabricator host can read the master key and decrypt
	+the data. In most configurations, this does not represent a significant
	+barrier above and beyond accessing the file data. Thus, configuring at-rest
	+encryption is primarily useful for two types of installs:
	+
	+ - If you maintain your own webserver and database hardware but want to use
	+ Amazon S3 or a similar cloud provider as a blind storage server, file data
	+ encryption can let you do so without needing to trust the cloud provider.
	+ - If you face a regulatory or compliance need to encrypt data at rest but do
	+ not need to actually secure this data, encrypting the data and placing the
	+ master key in plaintext next to it may satisfy compliance requirements.
	+
	+The remainder of this document discusses how to configure at-rest encryption.
	+
	+
	+Quick Start
	+===========
	+
	+To configure encryption, you will generally follow these steps:
	+
	+ - Generate a master key with `bin/files generate-key`.
	+ - Add the master key it to the `keyring`, but don't mark it as `default` yet.
	+ - Use `bin/files encode ...` to test encrypting a few files.
	+ - Mark the key as `default` to automatically encrypt new files.
	+ - Use `bin/files encode --all ...` to encrypt any existing files.
	+
	+See the following sections for detailed guidance on these steps.
	+
	+
	+Configuring a Keyring
	+=====================
	+
	+To configure a keyring, set `keyring` with `bin/config` or by using another
	+configuration source. This option should be a list of keys in this format:
	+
	+```lang=json
	+...
	+"keyring": [
	+ {
	+ "name": "master.key",
	+ "type": "aes-256-cbc",
	+ "material.base64": "UcHUJqq8MhZRwhvDV8sJwHj7bNJoM4tWfOIi..."
	+ "default": true
	+ },
	+ ...
	+]
	+...
	+```
	+
	+Each key should have these properties:
	+
	+ - `name`: //Required string.// A unique key name.
	+ - `type`: //Required string.// Type of the key. Only `aes-256-cbc` is
	+ supported.
	+ - `material.base64`: //Required string.// The key material. See below for
	+ details.
	+ - `default`: //Optional bool.// Optionally, mark exactly one key as the
	+ default key to enable encryption of newly uploaded file data.
	+
	+The key material is sensitive an an attacker who learns it can decrypt data
	+from the storage engine.
	+
	+
	+Format: Raw Data
	+================
	+
	+The `raw` storage format is automatically selected for all newly uploaded
	+file data if no key is makred as the `default` key in the keyring. This is
	+the behavior of Phabricator if you haven't configured anything.
	+
	+This format stores raw data without modification.
	+
	+
	+Format: AES256
	+==============
	+
	+The `aes-256-cbc` storage format is automatically selected for all newly
	+uploaded file data if an AES256 key is marked as the `default` key in the
	+keyring.
	+
	+This format uses AES256 in CBC mode. Each block of file data is encrypted with
	+a unique, randomly generated private key. That key is then encrypted with the
	+master key. Among other motivations, this strategy allows the master key to be
	+cycled relatively cheaply later (see "Cycling Master Keys" below).
	+
	+AES256 keys should be randomly generated and 256 bits (32 characters) in
	+length, then base64 encoded when represented in `keyring`.
	+
	+You can generate a valid, properly encoded AES256 master key with this command:
	+
	+```
	+phabricator/ $ ./bin/files generate-key --type aes-256-cbc
	+```
	+
	+This mode is generally similar to the default server-side encryption mode
	+supported by Amazon S3.
	+
	+
	+Format: ROT13
	+=============
	+
	+The `rot13` format is a test format that is never selected by default. You can
	+select this format explicitly with `bin/files encode` to test storage and
	+encryption behavior.
	+
	+This format applies ROT13 encoding to file data.
	+
	+
	+Changing File Storage Formats
	+=============================
	+
	+To test configuration, you can explicitly change the storage format of a file.
	+
	+This will read the file data, decrypt it if necessary, write a new copy of the
	+data with the desired encryption, then update the file to point at the new
	+data. You can use this to make sure encryption works before turning it on by
	+default.
	+
	+To change the format of an individual file, run this command:
	+
	+```
	+phabricator/ $ ./bin/files encode --as <format> F123 [--key <key>]
	+```
	+
	+This will change the storage format of the sepcified file.
	+
	+
	+Verifying Storage Formats
	+=========================
	+
	+You can review the storage format of a file from the web UI, in the
	+{nav Storage} tab under "Format". You can also use the "Engine" and "Handle"
	+properties to identify where the underlying data is stored and verify that
	+it is encrypted or encoded in the way you expect.
	+
	+See @{article:Configuring File Storage} for more information on storage
	+engines.
	+
	+
	+Cycling Master Keys
	+===================
	+
	+If you need to cycle your master key, some storage formats support key cycling.
	+
	+Cycling a file's encryption key decodes the local key for the data using the
	+old master key, then re-encodes it using the new master key. This is primarily
	+useful if you believe your master key may have been compromised.
	+
	+First, add a new key to the keyring and mark it as the default key. You need
	+to leave the old key in place for now so existing data can be decrypted.
	+
	+To cycle an individual file, run this command:
	+
	+```
	+phabricator/ $ ./bin/files cycle F123
	+```
	+
	+Verify that cycling worked properly by examining the command output and
	+accessing the file to check that the data is present and decryptable. You
	+can cycle additional files to gain additional confidence.
	+
	+You can cycle all files with this command:
	+
	+```
	+phabricator/ $ ./bin/files cycle --all
	+```
	+
	+Once all files have been cycled, remove the old master key from the keyring.
	+
	+Not all storage formats support key cycling: cycling a file only has an effect
	+if the storage format is an encrypted format. For example, cycling a file that
	+uses the `raw` storage format has no effect.
	+
	+
	+Next Steps
	+==========
	+
	+Continue by:
	+
	+ - understanding storage engines with @{article:Configuring File Storage}; or
	+ - returning to the @{article:Configuration Guide}.
	diff --git a/src/docs/user/configuration/configuring_file_storage.diviner b/src/docs/user/configuration/configuring_file_storage.diviner
	--- a/src/docs/user/configuration/configuring_file_storage.diviner
	+++ b/src/docs/user/configuration/configuring_file_storage.diviner
	@@ -197,4 +197,6 @@

	Continue by:

	+ - reviewing at-rest encryption options with
	+ @{article:Configuring Encryption}; or
	- returning to the @{article:Configuration Guide}.

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