1 files changed, 136 insertions, 0 deletions
diff --git a/apps/files_external/3rdparty/icewind/smb/src/KerberosApacheAuth.php b/apps/files_external/3rdparty/icewind/smb/src/KerberosApacheAuth.php
new file mode 100644
index 00000000000..c49918be114
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+++ b/apps/files_external/3rdparty/icewind/smb/src/KerberosApacheAuth.php
@@ -0,0 +1,136 @@
+<?php
+/**
+ * @copyright Copyright (c) 2018 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Icewind\SMB;
+
+use Icewind\SMB\Exception\DependencyException;
+use Icewind\SMB\Exception\Exception;
+
+/**
+ * Use existing kerberos ticket to authenticate and reuse the apache ticket cache (mod_auth_kerb)
+ */
+class KerberosApacheAuth extends KerberosAuth implements IAuth {
+	/** @var string */
+	private $ticketPath = "";
+
+	/** @var bool */
+	private $init = false;
+
+	/** @var string|false */
+	private $ticketName;
+
+	public function __construct() {
+		$this->ticketName = getenv("KRB5CCNAME");
+	}
+
+
+	/**
+	 * Copy the ticket to a temporary location and use that ticket for authentication
+	 *
+	 * @return void
+	 */
+	public function copyTicket(): void {
+		if (!$this->checkTicket()) {
+			return;
+		}
+		$krb5 = new \KRB5CCache();
+		$krb5->open($this->ticketName);
+		$tmpFilename = tempnam("/tmp", "krb5cc_php_");
+		$tmpCacheFile = "FILE:" . $tmpFilename;
+		$krb5->save($tmpCacheFile);
+		$this->ticketPath = $tmpFilename;
+		$this->ticketName = $tmpCacheFile;
+	}
+
+	/**
+	 * Pass the ticket to smbclient by memory instead of path
+	 *
+	 * @return void
+	 */
+	public function passTicketFromMemory(): void {
+		if (!$this->checkTicket()) {
+			return;
+		}
+		$krb5 = new \KRB5CCache();
+		$krb5->open($this->ticketName);
+		$this->ticketName = (string)$krb5->getName();
+	}
+
+	/**
+	 * Check if a valid kerberos ticket is present
+	 *
+	 * @return bool
+	 * @psalm-assert-if-true string $this->ticketName
+	 */
+	public function checkTicket(): bool {
+		//read apache kerberos ticket cache
+		if (!$this->ticketName) {
+			return false;
+		}
+
+		$krb5 = new \KRB5CCache();
+		$krb5->open($this->ticketName);
+		/** @psalm-suppress MixedArgument */
+		return count($krb5->getEntries()) > 0;
+	}
+
+	private function init(): void {
+		if ($this->init) {
+			return;
+		}
+		$this->init = true;
+		// inspired by https://git.typo3.org/TYPO3CMS/Extensions/fal_cifs.git
+
+		if (!extension_loaded("krb5")) {
+			// https://pecl.php.net/package/krb5
+			throw new DependencyException('Ensure php-krb5 is installed.');
+		}
+
+		//read apache kerberos ticket cache
+		if (!$this->checkTicket()) {
+			throw new Exception('No kerberos ticket cache environment variable (KRB5CCNAME) found.');
+		}
+
+		// note that even if the ticketname is the value we got from `getenv("KRB5CCNAME")` we still need to set the env variable ourselves
+		// this is because `getenv` also reads the variables passed from the SAPI (apache-php) and we need to set the variable in the OS's env
+		putenv("KRB5CCNAME=" . $this->ticketName);
+	}
+
+	public function getExtraCommandLineArguments(): string {
+		$this->init();
+		return parent::getExtraCommandLineArguments();
+	}
+
+	public function setExtraSmbClientOptions($smbClientState): void {
+		$this->init();
+		try {
+			parent::setExtraSmbClientOptions($smbClientState);
+		} catch (Exception $e) {
+			// suppress
+		}
+	}
+
+	public function __destruct() {
+		if (!empty($this->ticketPath) && file_exists($this->ticketPath) && is_file($this->ticketPath)) {
+			unlink($this->ticketPath);
+		}
+	}
+}