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First (incomplete) cut of this module. Based on Volker's original work.
Jeremy.
This commit is contained in:
Jeremy Allison
parent
28d2683903
commit
5cc096a109
@ -618,6 +618,7 @@ VFS_TSMSM_OBJ = modules/vfs_tsmsm.o
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VFS_FILEID_OBJ = modules/vfs_fileid.o
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VFS_AIO_FORK_OBJ = modules/vfs_aio_fork.o
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VFS_SYNCOPS_OBJ = modules/vfs_syncops.o
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VFS_ACL_XATTR_OBJ = modules/vfs_acl_xattr.o
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PLAINTEXT_AUTH_OBJ = auth/pampass.o auth/pass_check.o
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@ -2383,6 +2384,10 @@ bin/aio_fork.@SHLIBEXT@: $(BINARY_PREREQS) $(VFS_AIO_FORK_OBJ)
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@echo "Building plugin $@"
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@$(SHLD_MODULE) $(VFS_AIO_FORK_OBJ)
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bin/vfs_acl_xattr.@SHLIBEXT@: $(BINARY_PREREQS) $(VFS_ACL_XATTR_OBJ)
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@echo "Building plugin $@"
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@$(SHLD_MODULE) $(VFS_ACL_XATTR_OBJ)
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bin/registry.@SHLIBEXT@: $(BINARY_PREREQS) libgpo/gpext/registry.o
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@echo "Building plugin $@"
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@$(SHLD_MODULE) libgpo/gpext/registry.o
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315
source3/modules/vfs_acl_xattr.c
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315
source3/modules/vfs_acl_xattr.c
Normal file
@ -0,0 +1,315 @@
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/*
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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 "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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static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
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const struct timespec cts,
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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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struct timespec ts;
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ndr_err = ndr_pull_struct_blob(pblob, ctx, &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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/*
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* Check that the ctime timestamp is ealier
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* than the stored timestamp.
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*/
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ts = nt_time_to_unix_timespec(&xacl.info.sd_ts->last_changed);
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if (timespec_compare(&cts, &ts) > 0) {
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DEBUG(5, ("parse_acl_blob: stored ACL out of date.\n"));
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return NT_STATUS_EA_CORRUPT_ERROR;
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}
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*ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE,
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(security_info & OWNER_SECURITY_INFORMATION)
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? xacl.info.sd_ts->sd->owner_sid : NULL,
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(security_info & GROUP_SECURITY_INFORMATION)
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? xacl.info.sd_ts->sd->group_sid : NULL,
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(security_info & SACL_SECURITY_INFORMATION)
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? xacl.info.sd_ts->sd->sacl : NULL,
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(security_info & DACL_SECURITY_INFORMATION)
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? xacl.info.sd_ts->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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static NTSTATUS get_acl_blob(vfs_handle_struct *handle,
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TALLOC_CTX *ctx,
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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;
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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) {
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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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static int mkdir_acl_xattr(vfs_handle_struct *handle, const char *path, mode_t mode)
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{
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return SMB_VFS_NEXT_MKDIR(handle, path, mode);
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}
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static int rmdir_acl_xattr(vfs_handle_struct *handle, const char *path)
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{
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return SMB_VFS_NEXT_RMDIR(handle, path);
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}
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static int open_acl_xattr(vfs_handle_struct *handle, const char *fname, files_struct *fsp, int flags, mode_t mode)
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{
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return SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
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}
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static int unlink_acl_xattr(vfs_handle_struct *handle, const char *fname)
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{
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return SMB_VFS_NEXT_UNLINK(handle, fname);
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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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SEC_DESC **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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SMB_STRUCT_STAT sbuf;
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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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if (fsp && fsp->fh->fd != -1) {
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if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
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return map_nt_error_from_unix(errno);
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}
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} else {
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if (SMB_VFS_STAT(handle->conn, name, &sbuf) == -1) {
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return map_nt_error_from_unix(errno);
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}
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}
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status = parse_acl_blob(&blob, get_ctimespec(&sbuf),
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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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static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
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uint32 security_info, SEC_DESC **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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return NT_STATUS_OK;
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}
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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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static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
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const char *name, uint32 security_info, SEC_DESC **ppdesc)
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{
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NTSTATUS status = get_nt_acl_xattr_internal(handle, NULL,
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name, security_info, ppdesc);
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if (NT_STATUS_IS_OK(status)) {
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return NT_STATUS_OK;
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}
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return SMB_VFS_NEXT_GET_NT_ACL(handle, name,
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security_info, ppdesc);
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}
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static NTSTATUS create_acl_blob(SEC_DESC *psd, DATA_BLOB *pblob)
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{
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struct xattr_NTACL xacl;
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enum ndr_err_code ndr_err;
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TALLOC_CTX *ctx = talloc_tos();
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struct timespec curr = timespec_current();
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/* Horrid hack as setting an xattr changes the ctime
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* on Linux. This gives a race of 1 second during
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* which we would not see a POSIX ACL set.
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*/
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curr.tv_sec += 1;
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xacl.version = 2;
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xacl.info.sd_ts->sd = psd;
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unix_timespec_to_nt_time(&xacl.info.sd_ts->last_changed, curr);
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ndr_err = ndr_push_struct_blob(
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pblob, ctx, &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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static NTSTATUS store_acl_blob(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;
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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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errno = saved_errno;
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DEBUG(5, ("store_acl_blob: fsetxattr 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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static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
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uint32 security_info_sent, SEC_DESC *psd)
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{
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NTSTATUS status;
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DATA_BLOB blob;
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status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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create_acl_blob(psd, &blob);
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store_acl_blob(fsp, &blob);
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return NT_STATUS_OK;
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}
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/* VFS operations structure */
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static vfs_op_tuple skel_op_tuples[] =
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{
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{SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
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{SMB_VFS_OP(rmdir_acl_xattr), SMB_VFS_OP_RMDIR, SMB_VFS_LAYER_TRANSPARENT},
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{SMB_VFS_OP(open_acl_xattr), SMB_VFS_OP_OPEN, SMB_VFS_LAYER_TRANSPARENT},
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{SMB_VFS_OP(unlink_acl_xattr),SMB_VFS_OP_UNLINK,SMB_VFS_LAYER_TRANSPARENT},
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/* NT File ACL operations */
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{SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
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{SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
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{SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
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{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
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};
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NTSTATUS vfs_acl_xattr_init(void)
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{
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return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr", skel_op_tuples);
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}
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