mirror of
https://github.com/samba-team/samba.git
synced 2024-12-24 21:34:56 +03:00
f2b6258b68
Pair-Programmed-With: Jeremy Allison <jra@samba.org> Signed-off-by: Ralph Boehme <slow@samba.org>
553 lines
13 KiB
C
553 lines
13 KiB
C
/*
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* Store Windows ACLs in xattrs.
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*
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* Copyright (C) Volker Lendecke, 2008
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* Copyright (C) Jeremy Allison, 2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "smbd/smbd.h"
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#include "system/filesys.h"
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#include "librpc/gen_ndr/xattr.h"
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#include "auth.h"
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#include "vfs_acl_common.h"
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#include "lib/util/tevent_ntstatus.h"
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#include "lib/util/tevent_unix.h"
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/* Pull in the common functions. */
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#define ACL_MODULE_NAME "acl_xattr"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_VFS
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/*******************************************************************
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Pull a security descriptor into a DATA_BLOB from a xattr.
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*******************************************************************/
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static ssize_t getxattr_do(vfs_handle_struct *handle,
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files_struct *fsp,
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const char *xattr_name,
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uint8_t *val,
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size_t size)
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{
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ssize_t sizeret;
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int saved_errno = 0;
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become_root();
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sizeret = SMB_VFS_FGETXATTR(fsp, xattr_name, val, size);
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if (sizeret == -1) {
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saved_errno = errno;
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}
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unbecome_root();
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if (saved_errno != 0) {
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errno = saved_errno;
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}
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return sizeret;
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}
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static NTSTATUS fget_acl_blob(TALLOC_CTX *ctx,
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vfs_handle_struct *handle,
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files_struct *fsp,
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DATA_BLOB *pblob)
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{
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size_t size = 4096;
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uint8_t *val = NULL;
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uint8_t *tmp;
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ssize_t sizeret;
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ZERO_STRUCTP(pblob);
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again:
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tmp = talloc_realloc(ctx, val, uint8_t, size);
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if (tmp == NULL) {
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TALLOC_FREE(val);
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return NT_STATUS_NO_MEMORY;
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}
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val = tmp;
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sizeret =
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getxattr_do(handle, fsp, XATTR_NTACL_NAME, val, size);
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if (sizeret >= 0) {
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pblob->data = val;
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pblob->length = sizeret;
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return NT_STATUS_OK;
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}
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if (errno != ERANGE) {
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goto err;
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}
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/* Too small, try again. */
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sizeret =
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getxattr_do(handle, fsp, XATTR_NTACL_NAME, NULL, 0);
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if (sizeret < 0) {
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goto err;
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}
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if (size < sizeret) {
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size = sizeret;
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}
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if (size > 65536) {
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/* Max ACL size is 65536 bytes. */
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errno = ERANGE;
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goto err;
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}
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goto again;
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err:
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/* Real error - exit here. */
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TALLOC_FREE(val);
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return map_nt_error_from_unix(errno);
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}
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/*******************************************************************
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Store a DATA_BLOB into an xattr given an fsp pointer.
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*******************************************************************/
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static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
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files_struct *fsp,
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DATA_BLOB *pblob)
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{
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int ret;
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int saved_errno = 0;
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DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
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(unsigned int)pblob->length, fsp_str_dbg(fsp)));
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become_root();
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ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
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pblob->data, pblob->length, 0);
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if (ret) {
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saved_errno = errno;
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}
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unbecome_root();
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if (ret) {
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DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
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"with error %s\n",
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fsp_str_dbg(fsp),
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strerror(saved_errno) ));
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errno = saved_errno;
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return map_nt_error_from_unix(saved_errno);
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}
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return NT_STATUS_OK;
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}
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/*********************************************************************
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Remove a Windows ACL - we're setting the underlying POSIX ACL.
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*********************************************************************/
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static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
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files_struct *fsp,
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SMB_ACL_TYPE_T type,
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SMB_ACL_T theacl)
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{
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struct acl_common_fsp_ext *ext = (struct acl_common_fsp_ext *)
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VFS_FETCH_FSP_EXTENSION(handle, fsp);
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int ret;
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ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
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fsp,
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type,
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theacl);
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if (ret == -1) {
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return -1;
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}
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if (ext != NULL && ext->setting_nt_acl) {
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return 0;
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}
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become_root();
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SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
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unbecome_root();
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return 0;
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}
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static int connect_acl_xattr(struct vfs_handle_struct *handle,
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const char *service,
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const char *user)
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{
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const char *security_acl_xattr_name = NULL;
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int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
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bool ok;
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struct acl_common_config *config = NULL;
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if (ret < 0) {
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return ret;
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}
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ok = init_acl_common_config(handle, ACL_MODULE_NAME);
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if (!ok) {
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DBG_ERR("init_acl_common_config failed\n");
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return -1;
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}
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/* Ensure we have the parameters correct if we're
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* using this module. */
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DEBUG(2,("connect_acl_xattr: setting 'inherit acls = true' "
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"'dos filemode = true' and "
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"'force unknown acl user = true' for service %s\n",
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service ));
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lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
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lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
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lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
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SMB_VFS_HANDLE_GET_DATA(handle, config,
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struct acl_common_config,
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return -1);
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if (config->ignore_system_acls) {
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mode_t create_mask = lp_create_mask(SNUM(handle->conn));
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char *create_mask_str = NULL;
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if ((create_mask & 0666) != 0666) {
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create_mask |= 0666;
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create_mask_str = talloc_asprintf(handle, "0%o",
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create_mask);
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if (create_mask_str == NULL) {
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DBG_ERR("talloc_asprintf failed\n");
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return -1;
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}
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DBG_NOTICE("setting 'create mask = %s'\n", create_mask_str);
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lp_do_parameter (SNUM(handle->conn),
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"create mask", create_mask_str);
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TALLOC_FREE(create_mask_str);
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}
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DBG_NOTICE("setting 'directory mask = 0777', "
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"'store dos attributes = yes' and all "
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"'map ...' options to 'no'\n");
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lp_do_parameter(SNUM(handle->conn), "directory mask", "0777");
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lp_do_parameter(SNUM(handle->conn), "map archive", "no");
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lp_do_parameter(SNUM(handle->conn), "map hidden", "no");
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lp_do_parameter(SNUM(handle->conn), "map readonly", "no");
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lp_do_parameter(SNUM(handle->conn), "map system", "no");
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lp_do_parameter(SNUM(handle->conn), "store dos attributes",
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"yes");
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}
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security_acl_xattr_name = lp_parm_const_string(SNUM(handle->conn),
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"acl_xattr",
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"security_acl_name",
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NULL);
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if (security_acl_xattr_name != NULL) {
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config->security_acl_xattr_name = talloc_strdup(config, security_acl_xattr_name);
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if (config->security_acl_xattr_name == NULL) {
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return -1;
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}
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}
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return 0;
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}
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static int acl_xattr_unlinkat(vfs_handle_struct *handle,
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struct files_struct *dirfsp,
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const struct smb_filename *smb_fname,
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int flags)
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{
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int ret;
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if (flags & AT_REMOVEDIR) {
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ret = rmdir_acl_common(handle,
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dirfsp,
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smb_fname);
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} else {
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ret = unlink_acl_common(handle,
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dirfsp,
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smb_fname,
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flags);
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}
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return ret;
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}
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static NTSTATUS acl_xattr_fget_nt_acl(vfs_handle_struct *handle,
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files_struct *fsp,
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uint32_t security_info,
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TALLOC_CTX *mem_ctx,
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struct security_descriptor **ppdesc)
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{
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NTSTATUS status;
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status = fget_nt_acl_common(fget_acl_blob, handle, fsp,
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security_info, mem_ctx, ppdesc);
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return status;
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}
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static NTSTATUS acl_xattr_fset_nt_acl(vfs_handle_struct *handle,
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files_struct *fsp,
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uint32_t security_info_sent,
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const struct security_descriptor *psd)
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{
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NTSTATUS status;
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status = fset_nt_acl_common(fget_acl_blob, store_acl_blob_fsp,
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ACL_MODULE_NAME,
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handle, fsp, security_info_sent, psd);
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return status;
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}
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struct acl_xattr_getxattrat_state {
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struct vfs_aio_state aio_state;
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ssize_t xattr_size;
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uint8_t *xattr_value;
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};
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static void acl_xattr_getxattrat_done(struct tevent_req *subreq);
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static struct tevent_req *acl_xattr_getxattrat_send(
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct vfs_handle_struct *handle,
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files_struct *dirfsp,
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const struct smb_filename *smb_fname,
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const char *xattr_name,
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size_t alloc_hint)
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{
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struct tevent_req *req = NULL;
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struct tevent_req *subreq = NULL;
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struct acl_xattr_getxattrat_state *state = NULL;
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struct acl_common_config *config = NULL;
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SMB_VFS_HANDLE_GET_DATA(handle, config,
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struct acl_common_config,
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return NULL);
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req = tevent_req_create(mem_ctx, &state,
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struct acl_xattr_getxattrat_state);
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if (req == NULL) {
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return NULL;
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}
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if (strequal(xattr_name, config->security_acl_xattr_name)) {
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tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
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return tevent_req_post(req, ev);
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}
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if (config->security_acl_xattr_name != NULL &&
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strequal(xattr_name, XATTR_NTACL_NAME))
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{
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xattr_name = config->security_acl_xattr_name;
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}
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subreq = SMB_VFS_NEXT_GETXATTRAT_SEND(state,
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ev,
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handle,
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dirfsp,
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smb_fname,
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xattr_name,
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alloc_hint);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, acl_xattr_getxattrat_done, req);
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return req;
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}
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static void acl_xattr_getxattrat_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct acl_xattr_getxattrat_state *state = tevent_req_data(
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req, struct acl_xattr_getxattrat_state);
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state->xattr_size = SMB_VFS_NEXT_GETXATTRAT_RECV(subreq,
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&state->aio_state,
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state,
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&state->xattr_value);
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TALLOC_FREE(subreq);
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if (state->xattr_size == -1) {
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tevent_req_error(req, state->aio_state.error);
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return;
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}
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tevent_req_done(req);
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}
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static ssize_t acl_xattr_getxattrat_recv(struct tevent_req *req,
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struct vfs_aio_state *aio_state,
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TALLOC_CTX *mem_ctx,
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uint8_t **xattr_value)
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{
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struct acl_xattr_getxattrat_state *state = tevent_req_data(
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req, struct acl_xattr_getxattrat_state);
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ssize_t xattr_size;
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if (tevent_req_is_unix_error(req, &aio_state->error)) {
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tevent_req_received(req);
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return -1;
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}
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*aio_state = state->aio_state;
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xattr_size = state->xattr_size;
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if (xattr_value != NULL) {
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*xattr_value = talloc_move(mem_ctx, &state->xattr_value);
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}
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tevent_req_received(req);
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return xattr_size;
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}
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static ssize_t acl_xattr_fgetxattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp,
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const char *name,
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void *value,
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size_t size)
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{
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struct acl_common_config *config = NULL;
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SMB_VFS_HANDLE_GET_DATA(handle, config,
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struct acl_common_config,
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return -1);
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if (strequal(name, config->security_acl_xattr_name)) {
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errno = EACCES;
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return -1;
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}
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if (config->security_acl_xattr_name != NULL &&
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strequal(name, XATTR_NTACL_NAME))
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{
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name = config->security_acl_xattr_name;
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}
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return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
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}
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static ssize_t acl_xattr_flistxattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp,
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char *listbuf,
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size_t bufsize)
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{
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struct acl_common_config *config = NULL;
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ssize_t size;
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char *p = NULL;
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size_t nlen, consumed;
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SMB_VFS_HANDLE_GET_DATA(handle, config,
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struct acl_common_config,
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return -1);
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size = SMB_VFS_NEXT_FLISTXATTR(handle, fsp, listbuf, bufsize);
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if (size < 0) {
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return -1;
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}
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p = listbuf;
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while (p - listbuf < size) {
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nlen = strlen(p) + 1;
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if (strequal(p, config->security_acl_xattr_name)) {
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break;
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}
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p += nlen;
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}
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if (p - listbuf >= size) {
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/* No match */
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return size;
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}
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/*
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* The consumed helper variable just makes the math
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* a bit more digestible.
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*/
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consumed = p - listbuf;
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if (consumed + nlen < size) {
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/* If not the last name move, else just skip */
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memmove(p, p + nlen, size - consumed - nlen);
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}
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size -= nlen;
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return size;
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}
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static int acl_xattr_fremovexattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp,
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const char *name)
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{
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struct acl_common_config *config = NULL;
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SMB_VFS_HANDLE_GET_DATA(handle, config,
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struct acl_common_config,
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return -1);
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if (strequal(name, config->security_acl_xattr_name)) {
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errno = EACCES;
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return -1;
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}
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if (config->security_acl_xattr_name != NULL &&
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strequal(name, XATTR_NTACL_NAME))
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{
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name = config->security_acl_xattr_name;
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}
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return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
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}
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static int acl_xattr_fsetxattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp,
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const char *name,
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const void *value,
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size_t size,
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int flags)
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{
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struct acl_common_config *config = NULL;
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SMB_VFS_HANDLE_GET_DATA(handle, config,
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struct acl_common_config,
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return -1);
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if (strequal(name, config->security_acl_xattr_name)) {
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errno = EACCES;
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return -1;
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}
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if (config->security_acl_xattr_name != NULL &&
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strequal(name, XATTR_NTACL_NAME))
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{
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name = config->security_acl_xattr_name;
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}
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|
|
return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value, size, flags);
|
|
}
|
|
|
|
static struct vfs_fn_pointers vfs_acl_xattr_fns = {
|
|
.connect_fn = connect_acl_xattr,
|
|
.unlinkat_fn = acl_xattr_unlinkat,
|
|
.fchmod_fn = fchmod_acl_module_common,
|
|
.fget_nt_acl_fn = acl_xattr_fget_nt_acl,
|
|
.fset_nt_acl_fn = acl_xattr_fset_nt_acl,
|
|
.sys_acl_set_fd_fn = sys_acl_set_fd_xattr,
|
|
.getxattrat_send_fn = acl_xattr_getxattrat_send,
|
|
.getxattrat_recv_fn = acl_xattr_getxattrat_recv,
|
|
.fgetxattr_fn = acl_xattr_fgetxattr,
|
|
.flistxattr_fn = acl_xattr_flistxattr,
|
|
.fremovexattr_fn = acl_xattr_fremovexattr,
|
|
.fsetxattr_fn = acl_xattr_fsetxattr,
|
|
};
|
|
|
|
static_decl_vfs;
|
|
NTSTATUS vfs_acl_xattr_init(TALLOC_CTX *ctx)
|
|
{
|
|
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr",
|
|
&vfs_acl_xattr_fns);
|
|
}
|