mirror of
https://github.com/samba-team/samba.git
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53903d9eb1
Jeremy.
680 lines
18 KiB
C
680 lines
18 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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/* NOTE: This is an experimental module, not yet finished. JRA. */
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#include "includes.h"
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#include "librpc/gen_ndr/xattr.h"
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#include "librpc/gen_ndr/ndr_xattr.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_VFS
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/*******************************************************************
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Parse out a struct security_descriptor from a DATA_BLOB.
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*******************************************************************/
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static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
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uint32 security_info,
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struct security_descriptor **ppdesc)
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{
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TALLOC_CTX *ctx = talloc_tos();
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struct xattr_NTACL xacl;
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enum ndr_err_code ndr_err;
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size_t sd_size;
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ndr_err = ndr_pull_struct_blob(pblob, ctx, NULL, &xacl,
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(ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
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ndr_errstr(ndr_err)));
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return ndr_map_error2ntstatus(ndr_err);;
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}
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if (xacl.version != 2) {
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return NT_STATUS_REVISION_MISMATCH;
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}
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*ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION, xacl.info.sd_hs->sd->type | SEC_DESC_SELF_RELATIVE,
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(security_info & OWNER_SECURITY_INFORMATION)
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? xacl.info.sd_hs->sd->owner_sid : NULL,
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(security_info & GROUP_SECURITY_INFORMATION)
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? xacl.info.sd_hs->sd->group_sid : NULL,
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(security_info & SACL_SECURITY_INFORMATION)
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? xacl.info.sd_hs->sd->sacl : NULL,
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(security_info & DACL_SECURITY_INFORMATION)
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? xacl.info.sd_hs->sd->dacl : NULL,
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&sd_size);
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TALLOC_FREE(xacl.info.sd);
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return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
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}
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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 NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
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vfs_handle_struct *handle,
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files_struct *fsp,
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const char *name,
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DATA_BLOB *pblob)
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{
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size_t size = 1024;
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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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int saved_errno = 0;
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ZERO_STRUCTP(pblob);
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again:
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tmp = TALLOC_REALLOC_ARRAY(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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become_root();
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if (fsp && fsp->fh->fd != -1) {
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sizeret = SMB_VFS_FGETXATTR(fsp, XATTR_NTACL_NAME, val, size);
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} else {
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sizeret = SMB_VFS_GETXATTR(handle->conn, name,
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XATTR_NTACL_NAME, val, size);
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}
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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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/* Max ACL size is 65536 bytes. */
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if (sizeret == -1) {
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errno = saved_errno;
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if ((errno == ERANGE) && (size != 65536)) {
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/* Too small, try again. */
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size = 65536;
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goto again;
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}
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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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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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/*******************************************************************
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Create a DATA_BLOB from a security descriptor.
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*******************************************************************/
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static NTSTATUS create_acl_blob(const struct security_descriptor *psd, DATA_BLOB *pblob)
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{
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struct xattr_NTACL xacl;
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struct security_descriptor_hash sd_hs;
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enum ndr_err_code ndr_err;
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TALLOC_CTX *ctx = talloc_tos();
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ZERO_STRUCT(xacl);
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ZERO_STRUCT(sd_hs);
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xacl.version = 2;
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xacl.info.sd_hs = &sd_hs;
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xacl.info.sd_hs->sd = CONST_DISCARD(struct security_descriptor *, psd);
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memset(&xacl.info.sd_hs->hash[0], '\0', 16);
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ndr_err = ndr_push_struct_blob(
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pblob, ctx, NULL, &xacl,
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(ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
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ndr_errstr(ndr_err)));
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return ndr_map_error2ntstatus(ndr_err);;
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}
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return NT_STATUS_OK;
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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->fsp_name));
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become_root();
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if (fsp->fh->fd != -1) {
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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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} else {
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ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name,
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XATTR_NTACL_NAME,
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pblob->data, pblob->length, 0);
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}
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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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errno = saved_errno;
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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->fsp_name,
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strerror(errno) ));
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return map_nt_error_from_unix(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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Store a DATA_BLOB into an xattr given a pathname.
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*******************************************************************/
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static NTSTATUS store_acl_blob_pathname(vfs_handle_struct *handle,
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const char *fname,
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DATA_BLOB *pblob)
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{
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connection_struct *conn = handle->conn;
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int ret;
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int saved_errno = 0;
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DEBUG(10,("store_acl_blob_pathname: storing blob "
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"length %u on file %s\n",
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(unsigned int)pblob->length, fname));
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become_root();
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ret = SMB_VFS_SETXATTR(conn, fname,
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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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errno = saved_errno;
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DEBUG(5, ("store_acl_blob_pathname: setting attr failed "
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"for file %s with error %s\n",
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fname,
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strerror(errno) ));
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return map_nt_error_from_unix(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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Store a DATA_BLOB into an xattr given a pathname.
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*******************************************************************/
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static NTSTATUS get_nt_acl_xattr_internal(vfs_handle_struct *handle,
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files_struct *fsp,
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const char *name,
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uint32 security_info,
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struct security_descriptor **ppdesc)
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{
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TALLOC_CTX *ctx = talloc_tos();
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DATA_BLOB blob;
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NTSTATUS status;
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if (fsp && name == NULL) {
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name = fsp->fsp_name;
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}
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DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name));
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status = get_acl_blob(ctx, handle, fsp, name, &blob);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
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return status;
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}
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status = parse_acl_blob(&blob, security_info, ppdesc);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("parse_acl_blob returned %s\n",
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nt_errstr(status)));
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return status;
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}
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TALLOC_FREE(blob.data);
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return status;
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}
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/*********************************************************************
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Create a default security descriptor for a file in case no inheritance
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exists. All permissions to the owner and SYSTEM.
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*********************************************************************/
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static struct security_descriptor *default_file_sd(TALLOC_CTX *mem_ctx,
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SMB_STRUCT_STAT *psbuf)
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{
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struct dom_sid owner_sid, group_sid;
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size_t sd_size;
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struct security_ace *pace = NULL;
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struct security_acl *pacl = NULL;
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uid_to_sid(&owner_sid, psbuf->st_uid);
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gid_to_sid(&group_sid, psbuf->st_gid);
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pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
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if (!pace) {
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return NULL;
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}
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init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
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SEC_RIGHTS_FILE_ALL, 0);
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init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
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SEC_RIGHTS_FILE_ALL, 0);
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pacl = make_sec_acl(mem_ctx,
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NT4_ACL_REVISION,
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2,
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pace);
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if (!pacl) {
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return NULL;
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}
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return make_sec_desc(mem_ctx,
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SECURITY_DESCRIPTOR_REVISION_1,
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SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
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&owner_sid,
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&group_sid,
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NULL,
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pacl,
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&sd_size);
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}
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/*********************************************************************
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*********************************************************************/
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static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
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const char *fname,
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files_struct *fsp,
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bool container)
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{
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TALLOC_CTX *ctx = talloc_tos();
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NTSTATUS status;
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struct security_descriptor *parent_desc = NULL;
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struct security_descriptor *psd = NULL;
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DATA_BLOB blob;
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size_t size;
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char *parent_name;
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if (!parent_dirname_talloc(ctx,
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fname,
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&parent_name,
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NULL)) {
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return NT_STATUS_NO_MEMORY;
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}
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DEBUG(10,("inherit_new_acl: check directory %s\n",
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parent_name));
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status = get_nt_acl_xattr_internal(handle,
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NULL,
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parent_name,
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(OWNER_SECURITY_INFORMATION |
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GROUP_SECURITY_INFORMATION |
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DACL_SECURITY_INFORMATION),
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&parent_desc);
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if (NT_STATUS_IS_OK(status)) {
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/* Create an inherited descriptor from the parent. */
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if (DEBUGLEVEL >= 10) {
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DEBUG(10,("inherit_new_acl: parent acl is:\n"));
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NDR_PRINT_DEBUG(security_descriptor, parent_desc);
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}
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status = se_create_child_secdesc(ctx,
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&psd,
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&size,
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parent_desc,
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&handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
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&handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
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container);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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if (DEBUGLEVEL >= 10) {
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DEBUG(10,("inherit_new_acl: child acl is:\n"));
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NDR_PRINT_DEBUG(security_descriptor, psd);
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}
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} else {
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DEBUG(10,("inherit_new_acl: directory %s failed "
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"to get acl %s\n",
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parent_name,
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nt_errstr(status) ));
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}
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if (!psd || psd->dacl == NULL) {
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SMB_STRUCT_STAT sbuf;
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int ret;
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TALLOC_FREE(psd);
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if (fsp && !fsp->is_directory && fsp->fh->fd != -1) {
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ret = SMB_VFS_FSTAT(fsp, &sbuf);
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} else {
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ret = SMB_VFS_STAT(handle->conn,fname, &sbuf);
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}
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if (ret == -1) {
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return map_nt_error_from_unix(errno);
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}
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psd = default_file_sd(ctx, &sbuf);
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if (!psd) {
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return NT_STATUS_NO_MEMORY;
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}
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if (DEBUGLEVEL >= 10) {
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DEBUG(10,("inherit_new_acl: default acl is:\n"));
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NDR_PRINT_DEBUG(security_descriptor, psd);
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}
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}
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status = create_acl_blob(psd, &blob);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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if (fsp) {
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return store_acl_blob_fsp(handle, fsp, &blob);
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} else {
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return store_acl_blob_pathname(handle, fname, &blob);
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}
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}
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/*********************************************************************
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Check ACL on open. For new files inherit from parent directory.
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*********************************************************************/
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static int open_acl_xattr(vfs_handle_struct *handle,
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const char *fname,
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files_struct *fsp,
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int flags,
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mode_t mode)
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{
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uint32_t access_granted = 0;
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struct security_descriptor *pdesc = NULL;
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bool file_existed = true;
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NTSTATUS status = get_nt_acl_xattr_internal(handle,
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NULL,
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fname,
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(OWNER_SECURITY_INFORMATION |
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GROUP_SECURITY_INFORMATION |
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DACL_SECURITY_INFORMATION),
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&pdesc);
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if (NT_STATUS_IS_OK(status)) {
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/* See if we can access it. */
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status = smb1_file_se_access_check(pdesc,
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handle->conn->server_info->ptok,
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fsp->access_mask,
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&access_granted);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10,("open_acl_xattr: file %s open "
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"refused with error %s\n",
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fname,
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nt_errstr(status) ));
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errno = map_errno_from_nt_status(status);
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return -1;
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}
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} else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
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file_existed = false;
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}
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DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
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"file %s returned %s\n",
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fname,
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nt_errstr(status) ));
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fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
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if (!file_existed && fsp->fh->fd != -1) {
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/* File was created. Inherit from parent directory. */
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string_set(&fsp->fsp_name, fname);
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inherit_new_acl(handle, fname, fsp, false);
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}
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return fsp->fh->fd;
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}
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static int mkdir_acl_xattr(vfs_handle_struct *handle, const char *path, mode_t mode)
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{
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int ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);
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if (ret == -1) {
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return ret;
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}
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/* New directory - inherit from parent. */
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inherit_new_acl(handle, path, NULL, true);
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return ret;
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}
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/*********************************************************************
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Fetch a security descriptor given an fsp.
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*********************************************************************/
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static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
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uint32 security_info, struct security_descriptor **ppdesc)
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{
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NTSTATUS status = get_nt_acl_xattr_internal(handle, fsp,
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NULL, security_info, ppdesc);
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if (NT_STATUS_IS_OK(status)) {
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if (DEBUGLEVEL >= 10) {
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DEBUG(10,("fget_nt_acl_xattr: returning xattr sd for file %s\n",
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fsp->fsp_name));
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NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
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}
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return NT_STATUS_OK;
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}
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DEBUG(10,("fget_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
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fsp->fsp_name,
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nt_errstr(status) ));
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return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp,
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security_info, ppdesc);
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}
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/*********************************************************************
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Fetch a security descriptor given a pathname.
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*********************************************************************/
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static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
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const char *name, uint32 security_info, struct security_descriptor **ppdesc)
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{
|
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NTSTATUS status = get_nt_acl_xattr_internal(handle, NULL,
|
|
name, security_info, ppdesc);
|
|
if (NT_STATUS_IS_OK(status)) {
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10,("get_nt_acl_xattr: returning xattr sd for file %s\n",
|
|
name));
|
|
NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
DEBUG(10,("get_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
|
|
name,
|
|
nt_errstr(status) ));
|
|
|
|
return SMB_VFS_NEXT_GET_NT_ACL(handle, name,
|
|
security_info, ppdesc);
|
|
}
|
|
|
|
/*********************************************************************
|
|
Store a security descriptor given an fsp.
|
|
*********************************************************************/
|
|
|
|
static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
|
|
uint32 security_info_sent, const struct security_descriptor *psd)
|
|
{
|
|
NTSTATUS status;
|
|
DATA_BLOB blob;
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
|
|
fsp->fsp_name));
|
|
NDR_PRINT_DEBUG(security_descriptor,
|
|
CONST_DISCARD(struct security_descriptor *,psd));
|
|
}
|
|
|
|
status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
/* Ensure owner and group are set. */
|
|
if (!psd->owner_sid || !psd->group_sid) {
|
|
int ret;
|
|
SMB_STRUCT_STAT sbuf;
|
|
DOM_SID owner_sid, group_sid;
|
|
struct security_descriptor *nc_psd = dup_sec_desc(talloc_tos(), psd);
|
|
|
|
if (!nc_psd) {
|
|
return NT_STATUS_OK;
|
|
}
|
|
if (fsp->is_directory || fsp->fh->fd == -1) {
|
|
ret = SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf);
|
|
} else {
|
|
ret = SMB_VFS_FSTAT(fsp, &sbuf);
|
|
}
|
|
if (ret == -1) {
|
|
/* Lower level acl set succeeded,
|
|
* so still return OK. */
|
|
return NT_STATUS_OK;
|
|
}
|
|
create_file_sids(&sbuf, &owner_sid, &group_sid);
|
|
/* This is safe as nc_psd is discarded at fn exit. */
|
|
nc_psd->owner_sid = &owner_sid;
|
|
nc_psd->group_sid = &group_sid;
|
|
security_info_sent |= (OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION);
|
|
psd = nc_psd;
|
|
}
|
|
|
|
if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
|
|
psd->dacl != NULL &&
|
|
(psd->type & (SE_DESC_DACL_AUTO_INHERITED|
|
|
SE_DESC_DACL_AUTO_INHERIT_REQ))==
|
|
(SE_DESC_DACL_AUTO_INHERITED|
|
|
SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
|
|
struct security_descriptor *new_psd = NULL;
|
|
status = append_parent_acl(fsp, psd, &new_psd);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
/* Lower level acl set succeeded,
|
|
* so still return OK. */
|
|
return NT_STATUS_OK;
|
|
}
|
|
psd = new_psd;
|
|
}
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
|
|
fsp->fsp_name));
|
|
NDR_PRINT_DEBUG(security_descriptor,
|
|
CONST_DISCARD(struct security_descriptor *,psd));
|
|
}
|
|
create_acl_blob(psd, &blob);
|
|
store_acl_blob_fsp(handle, fsp, &blob);
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*********************************************************************
|
|
Remove a Windows ACL - we're setting the underlying POSIX ACL.
|
|
*********************************************************************/
|
|
|
|
static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
|
|
const char *name,
|
|
SMB_ACL_TYPE_T type,
|
|
SMB_ACL_T theacl)
|
|
{
|
|
int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
|
|
name,
|
|
type,
|
|
theacl);
|
|
if (ret == -1) {
|
|
return -1;
|
|
}
|
|
|
|
become_root();
|
|
SMB_VFS_REMOVEXATTR(handle->conn, name, XATTR_NTACL_NAME);
|
|
unbecome_root();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*********************************************************************
|
|
Remove a Windows ACL - we're setting the underlying POSIX ACL.
|
|
*********************************************************************/
|
|
|
|
static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
|
|
files_struct *fsp,
|
|
SMB_ACL_T theacl)
|
|
{
|
|
int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
|
|
fsp,
|
|
theacl);
|
|
if (ret == -1) {
|
|
return -1;
|
|
}
|
|
|
|
become_root();
|
|
SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
|
|
unbecome_root();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* VFS operations structure */
|
|
|
|
static vfs_op_tuple skel_op_tuples[] =
|
|
{
|
|
{SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
|
|
{SMB_VFS_OP(open_acl_xattr), SMB_VFS_OP_OPEN, SMB_VFS_LAYER_TRANSPARENT},
|
|
|
|
/* NT File ACL operations */
|
|
|
|
{SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
|
|
{SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
|
|
{SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
|
|
|
|
/* POSIX ACL operations. */
|
|
{SMB_VFS_OP(sys_acl_set_file_xattr), SMB_VFS_OP_SYS_ACL_SET_FILE, SMB_VFS_LAYER_TRANSPARENT},
|
|
{SMB_VFS_OP(sys_acl_set_fd_xattr), SMB_VFS_OP_SYS_ACL_SET_FD, SMB_VFS_LAYER_TRANSPARENT},
|
|
|
|
{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
|
|
};
|
|
|
|
NTSTATUS vfs_acl_xattr_init(void)
|
|
{
|
|
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr", skel_op_tuples);
|
|
}
|