437 lines
16 KiB
PHP
437 lines
16 KiB
PHP
<?php
|
|
|
|
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
|
|
|
|
/**
|
|
* Crypt_GPG is a package to use GPG from PHP
|
|
*
|
|
* This package provides an object oriented interface to GNU Privacy
|
|
* Guard (GPG). It requires the GPG executable to be on the system.
|
|
*
|
|
* Though GPG can support symmetric-key cryptography, this package is intended
|
|
* only to facilitate public-key cryptography.
|
|
*
|
|
* This file contains an abstract implementation of a user of the
|
|
* {@link Crypt_GPG_Engine} class.
|
|
*
|
|
* LICENSE:
|
|
*
|
|
* This library is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as
|
|
* published by the Free Software Foundation; either version 2.1 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, see
|
|
* <http://www.gnu.org/licenses/>
|
|
*
|
|
* @category Encryption
|
|
* @package Crypt_GPG
|
|
* @author Nathan Fredrickson <nathan@silverorange.com>
|
|
* @author Michael Gauthier <mike@silverorange.com>
|
|
* @copyright 2005-2013 silverorange
|
|
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
|
|
* @link http://pear.php.net/package/Crypt_GPG
|
|
* @link http://pear.php.net/manual/en/package.encryption.crypt-gpg.php
|
|
* @link http://www.gnupg.org/
|
|
*/
|
|
|
|
/**
|
|
* GPG key class
|
|
*/
|
|
require_once 'Crypt/GPG/Key.php';
|
|
|
|
/**
|
|
* GPG sub-key class
|
|
*/
|
|
require_once 'Crypt/GPG/SubKey.php';
|
|
|
|
/**
|
|
* GPG user id class
|
|
*/
|
|
require_once 'Crypt/GPG/UserId.php';
|
|
|
|
/**
|
|
* GPG process and I/O engine class
|
|
*/
|
|
require_once 'Crypt/GPG/Engine.php';
|
|
|
|
/**
|
|
* Base class for implementing a user of {@link Crypt_GPG_Engine}
|
|
*
|
|
* @category Encryption
|
|
* @package Crypt_GPG
|
|
* @author Nathan Fredrickson <nathan@silverorange.com>
|
|
* @author Michael Gauthier <mike@silverorange.com>
|
|
* @copyright 2005-2013 silverorange
|
|
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
|
|
* @link http://pear.php.net/package/Crypt_GPG
|
|
* @link http://www.gnupg.org/
|
|
*/
|
|
abstract class Crypt_GPGAbstract
|
|
{
|
|
/**
|
|
* Error code returned when there is no error.
|
|
*/
|
|
const ERROR_NONE = 0;
|
|
|
|
/**
|
|
* Error code returned when an unknown or unhandled error occurs.
|
|
*/
|
|
const ERROR_UNKNOWN = 1;
|
|
|
|
/**
|
|
* Error code returned when a bad passphrase is used.
|
|
*/
|
|
const ERROR_BAD_PASSPHRASE = 2;
|
|
|
|
/**
|
|
* Error code returned when a required passphrase is missing.
|
|
*/
|
|
const ERROR_MISSING_PASSPHRASE = 3;
|
|
|
|
/**
|
|
* Error code returned when a key that is already in the keyring is
|
|
* imported.
|
|
*/
|
|
const ERROR_DUPLICATE_KEY = 4;
|
|
|
|
/**
|
|
* Error code returned the required data is missing for an operation.
|
|
*
|
|
* This could be missing key data, missing encrypted data or missing
|
|
* signature data.
|
|
*/
|
|
const ERROR_NO_DATA = 5;
|
|
|
|
/**
|
|
* Error code returned when an unsigned key is used.
|
|
*/
|
|
const ERROR_UNSIGNED_KEY = 6;
|
|
|
|
/**
|
|
* Error code returned when a key that is not self-signed is used.
|
|
*/
|
|
const ERROR_NOT_SELF_SIGNED = 7;
|
|
|
|
/**
|
|
* Error code returned when a public or private key that is not in the
|
|
* keyring is used.
|
|
*/
|
|
const ERROR_KEY_NOT_FOUND = 8;
|
|
|
|
/**
|
|
* Error code returned when an attempt to delete public key having a
|
|
* private key is made.
|
|
*/
|
|
const ERROR_DELETE_PRIVATE_KEY = 9;
|
|
|
|
/**
|
|
* Error code returned when one or more bad signatures are detected.
|
|
*/
|
|
const ERROR_BAD_SIGNATURE = 10;
|
|
|
|
/**
|
|
* Error code returned when there is a problem reading GnuPG data files.
|
|
*/
|
|
const ERROR_FILE_PERMISSIONS = 11;
|
|
|
|
/**
|
|
* Error code returned when a key could not be created.
|
|
*/
|
|
const ERROR_KEY_NOT_CREATED = 12;
|
|
|
|
/**
|
|
* Error code returned when bad key parameters are used during key
|
|
* generation.
|
|
*/
|
|
const ERROR_BAD_KEY_PARAMS = 13;
|
|
|
|
/**
|
|
* URI at which package bugs may be reported.
|
|
*/
|
|
const BUG_URI = 'http://pear.php.net/bugs/report.php?package=Crypt_GPG';
|
|
|
|
/**
|
|
* Engine used to control the GPG subprocess
|
|
*
|
|
* @var Crypt_GPG_Engine
|
|
*
|
|
* @see Crypt_GPGAbstract::setEngine()
|
|
*/
|
|
protected $engine = null;
|
|
|
|
/**
|
|
* Creates a new GPG object
|
|
*
|
|
* Available options are:
|
|
*
|
|
* - <kbd>string homedir</kbd> - the directory where the GPG keyring files are
|
|
* stored. If not specified, Crypt_GPG uses the default
|
|
* of <kbd>~/.gnupg</kbd>.
|
|
* - <kbd>string publicKeyring</kbd> - the file path of the public keyring.
|
|
* Use this if the public keyring is not in the homedir,
|
|
* or if the keyring is in a directory not writable
|
|
* by the process invoking GPG (like Apache). Then you
|
|
* can specify the path to the keyring with this option
|
|
* (/foo/bar/pubring.gpg), and specify a writable directory
|
|
* (like /tmp) using the <i>homedir</i> option.
|
|
* - <kbd>string privateKeyring</kbd> - the file path of the private keyring.
|
|
* Use this if the private keyring is not in the homedir,
|
|
* or if the keyring is in a directory not writable
|
|
* by the process invoking GPG (like Apache). Then
|
|
* you can specify the path to the keyring with this option
|
|
* (/foo/bar/secring.gpg), and specify a writable directory
|
|
* (like /tmp) using the <i>homedir</i> option.
|
|
* - <kbd>string trustDb</kbd> - the file path of the web-of-trust database.
|
|
* Use this if the trust database is not in the homedir, or
|
|
* if the database is in a directory not writable
|
|
* by the process invoking GPG (like Apache). Then you can
|
|
* specify the path to the trust database with this option
|
|
* (/foo/bar/trustdb.gpg), and specify a writable directory
|
|
* (like /tmp) using the <i>homedir</i> option.
|
|
* - <kbd>string binary</kbd> - the location of the GPG binary.
|
|
* If not specified, the driver attempts to auto-detect
|
|
* the GPG binary location using a list of known default
|
|
* locations for the current operating system. The option
|
|
* <kbd>gpgBinary</kbd> is a deprecated alias.
|
|
* - <kbd>string agent</kbd> - the location of the GnuPG agent binary.
|
|
* The gpg-agent is only used for GnuPG 2.x. If not
|
|
* specified, the engine attempts to auto-detect
|
|
* the gpg-agent binary location using a list of
|
|
* know default locations for the current operating system.
|
|
* - <kbd>string|false gpgconf</kbd> - the location of the GnuPG conf binary.
|
|
* The gpgconf is only used for GnuPG >= 2.1. If not
|
|
* specified, the engine attempts to auto-detect
|
|
* the location using a list of know default locations.
|
|
* When set to FALSE `gpgconf --kill` will not be executed
|
|
* via destructor.
|
|
* - <kbd>string digest-algo</kbd> - Sets the message digest algorithm.
|
|
* - <kbd>string cipher-algo</kbd> - Sets the symmetric cipher.
|
|
* - <kbd>string compress-algo</kbd> - Sets the compression algorithm.
|
|
* - <kbd>boolean strict</kbd> - In strict mode clock problems on subkeys
|
|
* and signatures are not ignored (--ignore-time-conflict
|
|
* and --ignore-valid-from options).
|
|
* - <kbd>mixed debug</kbd> - whether or not to use debug mode.
|
|
* When debug mode is on, all communication to and from
|
|
* the GPG subprocess is logged. This can be useful to
|
|
* diagnose errors when using Crypt_GPG.
|
|
* - <kbd>array options</kbd> - additional per-command options to the GPG
|
|
* command. Key of the array is a command (e.g.
|
|
* gen-key, import, sign, encrypt, list-keys).
|
|
* Value is a string containing command line arguments to be
|
|
* added to the related command. For example:
|
|
* array('sign' => '--emit-version').
|
|
*
|
|
* @param array $options optional. An array of options used to create the
|
|
* GPG object. All options are optional and are
|
|
* represented as key-value pairs.
|
|
*
|
|
* @throws Crypt_GPG_FileException if the <kbd>homedir</kbd> does not exist
|
|
* and cannot be created. This can happen if <kbd>homedir</kbd> is
|
|
* not specified, Crypt_GPG is run as the web user, and the web
|
|
* user has no home directory. This exception is also thrown if any
|
|
* of the options <kbd>publicKeyring</kbd>,
|
|
* <kbd>privateKeyring</kbd> or <kbd>trustDb</kbd> options are
|
|
* specified but the files do not exist or are are not readable.
|
|
* This can happen if the user running the Crypt_GPG process (for
|
|
* example, the Apache user) does not have permission to read the
|
|
* files.
|
|
*
|
|
* @throws PEAR_Exception if the provided <kbd>binary</kbd> is invalid, or
|
|
* if no <kbd>binary</kbd> is provided and no suitable binary could
|
|
* be found.
|
|
*
|
|
* @throws PEAR_Exception if the provided <kbd>agent</kbd> is invalid, or
|
|
* if no <kbd>agent</kbd> is provided and no suitable gpg-agent
|
|
* could be found.
|
|
*/
|
|
public function __construct(array $options = array())
|
|
{
|
|
$this->setEngine(new Crypt_GPG_Engine($options));
|
|
}
|
|
|
|
/**
|
|
* Sets the I/O engine to use for GnuPG operations
|
|
*
|
|
* Normally this method does not need to be used. It provides a means for
|
|
* dependency injection.
|
|
*
|
|
* @param Crypt_GPG_Engine $engine the engine to use.
|
|
*
|
|
* @return Crypt_GPGAbstract the current object, for fluent interface.
|
|
*/
|
|
public function setEngine(Crypt_GPG_Engine $engine)
|
|
{
|
|
$this->engine = $engine;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Sets per-command additional arguments
|
|
*
|
|
* @param array $options Additional per-command options for GPG command.
|
|
* Note: This will unset options set previously.
|
|
* Key of the array is a command (e.g.
|
|
* gen-key, import, sign, encrypt, list-keys).
|
|
* Value is a string containing command line arguments to be
|
|
* added to the related command. For example:
|
|
* array('sign' => '--emit-version').
|
|
*
|
|
* @return Crypt_GPGAbstract the current object, for fluent interface.
|
|
*/
|
|
public function setEngineOptions(array $options)
|
|
{
|
|
$this->engine->setOptions($options);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Returns version of the engine (GnuPG) used for operation.
|
|
*
|
|
* @return string GnuPG version.
|
|
*
|
|
* @throws Crypt_GPG_Exception if an unknown or unexpected error occurs.
|
|
* Use the <kbd>debug</kbd> option and file a bug report if these
|
|
* exceptions occur.
|
|
*/
|
|
public function getVersion()
|
|
{
|
|
return $this->engine->getVersion();
|
|
}
|
|
|
|
/**
|
|
* Gets the available keys in the keyring
|
|
*
|
|
* Calls GPG with the <kbd>--list-keys</kbd> command and grabs keys. See
|
|
* the first section of <b>doc/DETAILS</b> in the
|
|
* {@link http://www.gnupg.org/download/ GPG package} for a detailed
|
|
* description of how the GPG command output is parsed.
|
|
*
|
|
* @param string $keyId optional. Only keys with that match the specified
|
|
* pattern are returned. The pattern may be part of
|
|
* a user id, a key id or a key fingerprint. If not
|
|
* specified, all keys are returned.
|
|
*
|
|
* @return array an array of {@link Crypt_GPG_Key} objects. If no keys
|
|
* match the specified <kbd>$keyId</kbd> an empty array is
|
|
* returned.
|
|
*
|
|
* @throws Crypt_GPG_Exception if an unknown or unexpected error occurs.
|
|
* Use the <kbd>debug</kbd> option and file a bug report if these
|
|
* exceptions occur.
|
|
*
|
|
* @see Crypt_GPG_Key
|
|
*/
|
|
protected function _getKeys($keyId = '')
|
|
{
|
|
// get private key fingerprints
|
|
if ($keyId == '') {
|
|
$operation = '--list-secret-keys';
|
|
} else {
|
|
$operation = '--utf8-strings --list-secret-keys -- ' . escapeshellarg($keyId);
|
|
}
|
|
|
|
// According to The file 'doc/DETAILS' in the GnuPG distribution, using
|
|
// double '--with-fingerprint' also prints the fingerprint for subkeys.
|
|
$arguments = array(
|
|
'--with-colons',
|
|
'--with-fingerprint',
|
|
'--with-fingerprint',
|
|
'--fixed-list-mode'
|
|
);
|
|
|
|
$output = '';
|
|
|
|
$this->engine->reset();
|
|
$this->engine->setOutput($output);
|
|
$this->engine->setOperation($operation, $arguments);
|
|
$this->engine->run();
|
|
|
|
$privateKeyFingerprints = array();
|
|
|
|
foreach (explode(PHP_EOL, $output) as $line) {
|
|
$lineExp = explode(':', $line);
|
|
if ($lineExp[0] == 'fpr') {
|
|
$privateKeyFingerprints[] = $lineExp[9];
|
|
}
|
|
}
|
|
|
|
// get public keys
|
|
if ($keyId == '') {
|
|
$operation = '--list-public-keys';
|
|
} else {
|
|
$operation = '--utf8-strings --list-public-keys -- ' . escapeshellarg($keyId);
|
|
}
|
|
|
|
$output = '';
|
|
|
|
$this->engine->reset();
|
|
$this->engine->setOutput($output);
|
|
$this->engine->setOperation($operation, $arguments);
|
|
$this->engine->run();
|
|
|
|
$keys = array();
|
|
$key = null; // current key
|
|
$subKey = null; // current sub-key
|
|
|
|
foreach (explode(PHP_EOL, $output) as $line) {
|
|
$lineExp = explode(':', $line);
|
|
|
|
if ($lineExp[0] == 'pub') {
|
|
|
|
// new primary key means last key should be added to the array
|
|
if ($key !== null) {
|
|
$keys[] = $key;
|
|
}
|
|
|
|
$key = new Crypt_GPG_Key();
|
|
|
|
$subKey = Crypt_GPG_SubKey::parse($line);
|
|
$key->addSubKey($subKey);
|
|
|
|
} elseif ($lineExp[0] == 'sub') {
|
|
|
|
$subKey = Crypt_GPG_SubKey::parse($line);
|
|
$key->addSubKey($subKey);
|
|
|
|
} elseif ($lineExp[0] == 'fpr') {
|
|
|
|
$fingerprint = $lineExp[9];
|
|
|
|
// set current sub-key fingerprint
|
|
$subKey->setFingerprint($fingerprint);
|
|
|
|
// if private key exists, set has private to true
|
|
if (in_array($fingerprint, $privateKeyFingerprints)) {
|
|
$subKey->setHasPrivate(true);
|
|
}
|
|
|
|
} elseif ($lineExp[0] == 'uid') {
|
|
|
|
$string = stripcslashes($lineExp[9]); // as per documentation
|
|
$userId = new Crypt_GPG_UserId($string);
|
|
|
|
if ($lineExp[1] == 'r') {
|
|
$userId->setRevoked(true);
|
|
}
|
|
|
|
$key->addUserId($userId);
|
|
|
|
}
|
|
}
|
|
|
|
// add last key
|
|
if ($key !== null) {
|
|
$keys[] = $key;
|
|
}
|
|
|
|
return $keys;
|
|
}
|
|
}
|