From 3f619478f796eddbba6e39502fe941b285dd97b1 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 4 May 2024 20:00:34 +0200
Subject: Adding upstream version 1:10.11.6.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 plugin/auth_socket/auth_socket.c | 156 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 plugin/auth_socket/auth_socket.c

(limited to 'plugin/auth_socket/auth_socket.c')

diff --git a/plugin/auth_socket/auth_socket.c b/plugin/auth_socket/auth_socket.c
new file mode 100644
index 00000000..3a933b6a
--- /dev/null
+++ b/plugin/auth_socket/auth_socket.c
@@ -0,0 +1,156 @@
+/* Copyright (C) 2010 Sergei Golubchik and Monty Program Ab
+   Copyright (c) 2010, 2011, Oracle and/or its affiliates.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; version 2 of the
+    License.
+    
+    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 General Public License for more details.
+    
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
+
+/**
+  @file
+
+  auth_socket authentication plugin.
+
+  Authentication is successful if the connection is done via a unix socket and
+  the owner of the client process matches the user name that was used when
+  connecting to mysqld.
+*/
+#define _GNU_SOURCE 1 /* for struct ucred */
+
+#include <mysql/plugin_auth.h>
+#include <string.h>
+#include <pwd.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#ifdef HAVE_PEERCRED
+#define level SOL_SOCKET
+
+#elif defined HAVE_SOCKPEERCRED
+#define level SOL_SOCKET
+#define ucred sockpeercred
+
+#elif defined HAVE_XUCRED
+#include <sys/un.h>
+#include <sys/ucred.h>
+#define level 0
+#define SO_PEERCRED LOCAL_PEERCRED
+#define uid cr_uid
+#define ucred xucred
+
+#elif defined HAVE_UNPCBID
+#include <sys/un.h>
+#define level 0
+#define SO_PEERCRED LOCAL_PEEREID
+#define uid unp_euid
+#define ucred unpcbid
+
+#elif defined HAVE_GETPEERUCRED
+#include <ucred.h>
+
+#elif defined HAVE_PEERCRED_STRUCT
+#define level SOL_SOCKET
+#define SO_PEERCRED SO_PEERID
+#define uid euid
+#define ucred peercred_struct
+ 
+#else
+#error impossible
+#endif
+
+/**
+  perform the unix socket based authentication
+
+  This authentication callback performs a unix socket based authentication -
+  it gets the uid of the client process and considers the user authenticated
+  if it uses username of this uid. That is - if the user is already
+  authenticated to the OS (if she is logged in) - she can use MySQL as herself
+*/
+
+static int socket_auth(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
+{
+  unsigned char *pkt;
+  MYSQL_PLUGIN_VIO_INFO vio_info;
+#ifdef HAVE_GETPEERUCRED
+  ucred_t *cred = NULL;
+#else
+  struct ucred cred;
+  socklen_t cred_len= sizeof(cred);
+#endif
+  struct passwd pwd_buf, *pwd;
+  char buf[1024];
+  uid_t u;
+
+  /* no user name yet ? read the client handshake packet with the user name */
+  if (info->user_name == 0)
+  {
+    if (vio->read_packet(vio, &pkt) < 0)
+      return CR_ERROR;
+  }
+
+  info->password_used= PASSWORD_USED_NO_MENTION;
+
+  vio->info(vio, &vio_info);
+  if (vio_info.protocol != MYSQL_VIO_SOCKET)
+    return CR_ERROR;
+
+  /* get the UID of the client process */
+#ifdef HAVE_GETPEERUCRED
+  if (getpeerucred(vio_info.socket, &cred) != 0)
+    return CR_ERROR;
+  u = ucred_geteuid(cred);
+  ucred_free(cred);
+#else
+  if (getsockopt(vio_info.socket, level, SO_PEERCRED, &cred, &cred_len))
+    return CR_ERROR;
+
+  if (cred_len != sizeof(cred))
+    return CR_ERROR;
+
+  u = cred.uid;
+#endif
+
+  /* and find the username for this uid */
+  getpwuid_r(u, &pwd_buf, buf, sizeof(buf), &pwd);
+  if (pwd == NULL)
+    return CR_ERROR;
+
+  /* now it's simple as that */
+  return strcmp(pwd->pw_name, info->user_name) ? CR_ERROR : CR_OK;
+}
+
+static struct st_mysql_auth socket_auth_handler=
+{
+  MYSQL_AUTHENTICATION_INTERFACE_VERSION,
+  0,
+  socket_auth,
+  NULL, NULL /* no PASSWORD() */
+};
+
+maria_declare_plugin(auth_socket)
+{
+  MYSQL_AUTHENTICATION_PLUGIN,
+  &socket_auth_handler,
+  "unix_socket",
+  "Sergei Golubchik",
+  "Unix Socket based authentication",
+  PLUGIN_LICENSE_GPL,
+  NULL,
+  NULL,
+  0x0100,
+  NULL,
+  NULL,
+  "1.0",
+  MariaDB_PLUGIN_MATURITY_STABLE
+}
+maria_declare_plugin_end;
+
-- 
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