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/*
* Unix SMB/CIFS implementation.
* Samba VFS module for error injection in VFS calls
* Copyright (C) Christof Schmitt 2017
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/smbd.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS
struct unix_error_map {
const char *err_str;
int error;
} unix_error_map_array[] = {
{ "ESTALE", ESTALE },
{ "EBADF", EBADF },
{ "EINTR", EINTR },
{ "EACCES", EACCES },
{ "EROFS", EROFS },
};
static int find_unix_error_from_string(const char *err_str)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(unix_error_map_array); i++) {
struct unix_error_map *m = &unix_error_map_array[i];
if (strequal(err_str, m->err_str)) {
return m->error;
}
}
return 0;
}
static int inject_unix_error(const char *vfs_func, vfs_handle_struct *handle)
{
const char *err_str;
int error;
err_str = lp_parm_const_string(SNUM(handle->conn),
"error_inject", vfs_func, NULL);
if (err_str == NULL) {
return 0;
}
error = find_unix_error_from_string(err_str);
if (error != 0) {
DBG_WARNING("Returning error %s for VFS function %s\n",
err_str, vfs_func);
return error;
}
if (strequal(err_str, "panic")) {
DBG_ERR("Panic in VFS function %s\n", vfs_func);
smb_panic("error_inject");
}
DBG_ERR("Unknown error inject %s requested "
"for vfs function %s\n", err_str, vfs_func);
return 0;
}
static int vfs_error_inject_chdir(vfs_handle_struct *handle,
const struct smb_filename *smb_fname)
{
int error;
error = inject_unix_error("chdir", handle);
if (error != 0) {
errno = error;
return -1;
}
return SMB_VFS_NEXT_CHDIR(handle, smb_fname);
}
static ssize_t vfs_error_inject_pwrite(vfs_handle_struct *handle,
files_struct *fsp,
const void *data,
size_t n,
off_t offset)
{
int error;
error = inject_unix_error("pwrite", handle);
if (error != 0) {
errno = error;
return -1;
}
return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
}
static int vfs_error_inject_openat(struct vfs_handle_struct *handle,
const struct files_struct *dirfsp,
const struct smb_filename *smb_fname,
files_struct *fsp,
const struct vfs_open_how *how)
{
int error = inject_unix_error("openat", handle);
int create_error = inject_unix_error("openat_create", handle);
int dirfsp_flags = (O_NOFOLLOW|O_DIRECTORY);
bool return_error;
#ifdef O_PATH
dirfsp_flags |= O_PATH;
#else
#ifdef O_SEARCH
dirfsp_flags |= O_SEARCH;
#endif
#endif
if ((create_error != 0) && (how->flags & O_CREAT)) {
struct stat_ex st = {
.st_ex_nlink = 0,
};
int ret;
ret = SMB_VFS_FSTATAT(handle->conn,
dirfsp,
smb_fname,
&st,
AT_SYMLINK_NOFOLLOW);
if ((ret == -1) && (errno == ENOENT)) {
errno = create_error;
return -1;
}
}
return_error = (error != 0);
return_error &= !fsp->fsp_flags.is_pathref;
return_error &= ((how->flags & dirfsp_flags) != dirfsp_flags);
if (return_error) {
errno = error;
return -1;
}
return SMB_VFS_NEXT_OPENAT(handle, dirfsp, smb_fname, fsp, how);
}
static int vfs_error_inject_unlinkat(struct vfs_handle_struct *handle,
struct files_struct *dirfsp,
const struct smb_filename *smb_fname,
int flags)
{
struct smb_filename *full_fname = NULL;
struct smb_filename *parent_fname = NULL;
int error = inject_unix_error("unlinkat", handle);
int ret;
NTSTATUS status;
if (error == 0) {
return SMB_VFS_NEXT_UNLINKAT(handle, dirfsp, smb_fname, flags);
}
full_fname = full_path_from_dirfsp_atname(talloc_tos(),
dirfsp,
smb_fname);
if (full_fname == NULL) {
return -1;
}
status = SMB_VFS_PARENT_PATHNAME(handle->conn,
full_fname, /* TALLOC_CTX. */
full_fname,
&parent_fname,
NULL);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(full_fname);
errno = map_errno_from_nt_status(status);
return -1;
}
ret = SMB_VFS_STAT(handle->conn, parent_fname);
if (ret != 0) {
TALLOC_FREE(full_fname);
return -1;
}
if (parent_fname->st.st_ex_uid == get_current_uid(dirfsp->conn)) {
return SMB_VFS_NEXT_UNLINKAT(handle, dirfsp, smb_fname, flags);
}
errno = error;
return -1;
}
static struct vfs_fn_pointers vfs_error_inject_fns = {
.chdir_fn = vfs_error_inject_chdir,
.pwrite_fn = vfs_error_inject_pwrite,
.openat_fn = vfs_error_inject_openat,
.unlinkat_fn = vfs_error_inject_unlinkat,
};
static_decl_vfs;
NTSTATUS vfs_error_inject_init(TALLOC_CTX *ctx)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "error_inject",
&vfs_error_inject_fns);
}
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