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PhabricatorAuthSSHPublicKey.php
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Created
Fri, Aug 16, 18:53

PhabricatorAuthSSHPublicKey.php
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<?php
/**
* Data structure representing a raw public key.
*/
final class PhabricatorAuthSSHPublicKey extends Phobject {
private $type;
private $body;
private $comment;
private function __construct() {
// <internal>
}
public static function newFromStoredKey(PhabricatorAuthSSHKey $key) {
$public_key = new PhabricatorAuthSSHPublicKey();
$public_key->type = $key->getKeyType();
$public_key->body = $key->getKeyBody();
$public_key->comment = $key->getKeyComment();
return $public_key;
}
public static function newFromRawKey($entire_key) {
$entire_key = trim($entire_key);
if (!strlen($entire_key)) {
throw new Exception(pht('No public key was provided.'));
}
$parts = str_replace("\n", '', $entire_key);
// The third field (the comment) can have spaces in it, so split this
// into a maximum of three parts.
$parts = preg_split('/\s+/', $parts, 3);
if (preg_match('/private\s*key/i', $entire_key)) {
// Try to give the user a better error message if it looks like
// they uploaded a private key.
throw new Exception(pht('Provide a public key, not a private key!'));
}
switch (count($parts)) {
case 1:
throw new Exception(
pht('Provided public key is not properly formatted.'));
case 2:
// Add an empty comment part.
$parts[] = '';
break;
case 3:
// This is the expected case.
break;
}
list($type, $body, $comment) = $parts;
$recognized_keys = array(
'ssh-dsa',
'ssh-dss',
'ssh-rsa',
'ecdsa-sha2-nistp256',
'ecdsa-sha2-nistp384',
'ecdsa-sha2-nistp521',
);
if (!in_array($type, $recognized_keys)) {
$type_list = implode(', ', $recognized_keys);
throw new Exception(
pht(
'Public key type should be one of: %s',
$type_list));
}
$public_key = new PhabricatorAuthSSHPublicKey();
$public_key->type = $type;
$public_key->body = $body;
$public_key->comment = $comment;
return $public_key;
}
public function getType() {
return $this->type;
}
public function getBody() {
return $this->body;
}
public function getComment() {
return $this->comment;
}
public function getHash() {
$body = $this->getBody();
$body = trim($body);
$body = rtrim($body, '=');
return PhabricatorHash::digestForIndex($body);
}
public function getEntireKey() {
$key = $this->type.' '.$this->body;
if (strlen($this->comment)) {
$key = $key.' '.$this->comment;
}
return $key;
}
public function toPKCS8() {
$entire_key = $this->getEntireKey();
$cache_key = $this->getPKCS8CacheKey($entire_key);
$cache = PhabricatorCaches::getImmutableCache();
$pkcs8_key = $cache->getKey($cache_key);
if ($pkcs8_key) {
return $pkcs8_key;
}
$tmp = new TempFile();
Filesystem::writeFile($tmp, $this->getEntireKey());
try {
list($pkcs8_key) = execx(
'ssh-keygen -e -m PKCS8 -f %s',
$tmp);
} catch (CommandException $ex) {
unset($tmp);
throw new PhutilProxyException(
pht(
'Failed to convert public key into PKCS8 format. If you are '.
'developing on OSX, you may be able to use `bin/auth cache-pkcs8` '.
'to work around this issue. %s',
$ex->getMessage()),
$ex);
}
unset($tmp);
$cache->setKey($cache_key, $pkcs8_key);
return $pkcs8_key;
}
public function forcePopulatePKCS8Cache($pkcs8_key) {
$entire_key = $this->getEntireKey();
$cache_key = $this->getPKCS8CacheKey($entire_key);
$cache = PhabricatorCaches::getImmutableCache();
$cache->setKey($cache_key, $pkcs8_key);
}
private function getPKCS8CacheKey($entire_key) {
return 'pkcs8:'.PhabricatorHash::digestForIndex($entire_key);
}
}

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