mirror of
https://github.com/samba-team/samba.git
synced 2024-12-25 23:21:54 +03:00
182eea9ae2
If "inherit owner = yes", pass in the directory owner and group owner as the target for CREATOR_OWNER and CREATOR_GROUP substitutions, and also as the owner and primary group of the new security descriptor being applied to the object. Jeremy.
1084 lines
27 KiB
C
1084 lines
27 KiB
C
/*
|
|
* Store Windows ACLs in data store - common functions.
|
|
* #included into modules/vfs_acl_xattr.c and modules/vfs_acl_tdb.c
|
|
*
|
|
* Copyright (C) Volker Lendecke, 2008
|
|
* Copyright (C) Jeremy Allison, 2009
|
|
*
|
|
* 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 "smbd/smbd.h"
|
|
#include "system/filesys.h"
|
|
#include "../libcli/security/security.h"
|
|
#include "../librpc/gen_ndr/ndr_security.h"
|
|
|
|
static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
|
|
DATA_BLOB *pblob,
|
|
uint16_t hash_type,
|
|
uint8_t hash[XATTR_SD_HASH_SIZE]);
|
|
|
|
static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
|
|
vfs_handle_struct *handle,
|
|
files_struct *fsp,
|
|
const char *name,
|
|
DATA_BLOB *pblob);
|
|
|
|
static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
|
|
files_struct *fsp,
|
|
DATA_BLOB *pblob);
|
|
|
|
#define HASH_SECURITY_INFO (SECINFO_OWNER | \
|
|
SECINFO_GROUP | \
|
|
SECINFO_DACL | \
|
|
SECINFO_SACL)
|
|
|
|
/*******************************************************************
|
|
Hash a security descriptor.
|
|
*******************************************************************/
|
|
|
|
static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
|
|
uint8_t *hash)
|
|
{
|
|
DATA_BLOB blob;
|
|
SHA256_CTX tctx;
|
|
NTSTATUS status;
|
|
|
|
memset(hash, '\0', XATTR_SD_HASH_SIZE);
|
|
status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
samba_SHA256_Init(&tctx);
|
|
samba_SHA256_Update(&tctx, blob.data, blob.length);
|
|
samba_SHA256_Final(hash, &tctx);
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*******************************************************************
|
|
Parse out a struct security_descriptor from a DATA_BLOB.
|
|
*******************************************************************/
|
|
|
|
static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
|
|
struct security_descriptor **ppdesc,
|
|
uint16_t *p_hash_type,
|
|
uint8_t hash[XATTR_SD_HASH_SIZE])
|
|
{
|
|
TALLOC_CTX *ctx = talloc_tos();
|
|
struct xattr_NTACL xacl;
|
|
enum ndr_err_code ndr_err;
|
|
size_t sd_size;
|
|
|
|
ndr_err = ndr_pull_struct_blob(pblob, ctx, &xacl,
|
|
(ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
|
|
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
|
|
ndr_errstr(ndr_err)));
|
|
return ndr_map_error2ntstatus(ndr_err);
|
|
}
|
|
|
|
switch (xacl.version) {
|
|
case 2:
|
|
*ppdesc = make_sec_desc(ctx, SD_REVISION,
|
|
xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
|
|
xacl.info.sd_hs2->sd->owner_sid,
|
|
xacl.info.sd_hs2->sd->group_sid,
|
|
xacl.info.sd_hs2->sd->sacl,
|
|
xacl.info.sd_hs2->sd->dacl,
|
|
&sd_size);
|
|
/* No hash - null out. */
|
|
*p_hash_type = XATTR_SD_HASH_TYPE_NONE;
|
|
memset(hash, '\0', XATTR_SD_HASH_SIZE);
|
|
break;
|
|
case 3:
|
|
*ppdesc = make_sec_desc(ctx, SD_REVISION,
|
|
xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
|
|
xacl.info.sd_hs3->sd->owner_sid,
|
|
xacl.info.sd_hs3->sd->group_sid,
|
|
xacl.info.sd_hs3->sd->sacl,
|
|
xacl.info.sd_hs3->sd->dacl,
|
|
&sd_size);
|
|
*p_hash_type = xacl.info.sd_hs3->hash_type;
|
|
/* Current version 3. */
|
|
memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
|
|
break;
|
|
default:
|
|
return NT_STATUS_REVISION_MISMATCH;
|
|
}
|
|
|
|
TALLOC_FREE(xacl.info.sd);
|
|
|
|
return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
/*******************************************************************
|
|
Create a DATA_BLOB from a security descriptor.
|
|
*******************************************************************/
|
|
|
|
static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
|
|
DATA_BLOB *pblob,
|
|
uint16_t hash_type,
|
|
uint8_t hash[XATTR_SD_HASH_SIZE])
|
|
{
|
|
struct xattr_NTACL xacl;
|
|
struct security_descriptor_hash_v3 sd_hs3;
|
|
enum ndr_err_code ndr_err;
|
|
TALLOC_CTX *ctx = talloc_tos();
|
|
|
|
ZERO_STRUCT(xacl);
|
|
ZERO_STRUCT(sd_hs3);
|
|
|
|
xacl.version = 3;
|
|
xacl.info.sd_hs3 = &sd_hs3;
|
|
xacl.info.sd_hs3->sd = CONST_DISCARD(struct security_descriptor *, psd);
|
|
xacl.info.sd_hs3->hash_type = hash_type;
|
|
memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
|
|
|
|
ndr_err = ndr_push_struct_blob(
|
|
pblob, ctx, &xacl,
|
|
(ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
|
|
|
|
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
|
|
DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
|
|
ndr_errstr(ndr_err)));
|
|
return ndr_map_error2ntstatus(ndr_err);
|
|
}
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*******************************************************************
|
|
Add in 3 inheritable components for a non-inheritable directory ACL.
|
|
CREATOR_OWNER/CREATOR_GROUP/WORLD.
|
|
*******************************************************************/
|
|
|
|
static void add_directory_inheritable_components(vfs_handle_struct *handle,
|
|
const char *name,
|
|
SMB_STRUCT_STAT *psbuf,
|
|
struct security_descriptor *psd)
|
|
{
|
|
struct connection_struct *conn = handle->conn;
|
|
int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
|
|
struct smb_filename smb_fname;
|
|
enum security_ace_type acltype;
|
|
uint32_t access_mask;
|
|
mode_t dir_mode;
|
|
mode_t file_mode;
|
|
mode_t mode;
|
|
struct security_ace *new_ace_list = TALLOC_ZERO_ARRAY(talloc_tos(),
|
|
struct security_ace,
|
|
num_aces + 3);
|
|
|
|
if (new_ace_list == NULL) {
|
|
return;
|
|
}
|
|
|
|
/* Fake a quick smb_filename. */
|
|
ZERO_STRUCT(smb_fname);
|
|
smb_fname.st = *psbuf;
|
|
smb_fname.base_name = CONST_DISCARD(char *, name);
|
|
|
|
dir_mode = unix_mode(conn,
|
|
FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
|
|
file_mode = unix_mode(conn,
|
|
FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
|
|
|
|
mode = dir_mode | file_mode;
|
|
|
|
DEBUG(10, ("add_directory_inheritable_components: directory %s, "
|
|
"mode = 0%o\n",
|
|
name,
|
|
(unsigned int)mode ));
|
|
|
|
if (num_aces) {
|
|
memcpy(new_ace_list, psd->dacl->aces,
|
|
num_aces * sizeof(struct security_ace));
|
|
}
|
|
access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
|
|
mode & 0700, false);
|
|
|
|
init_sec_ace(&new_ace_list[num_aces],
|
|
&global_sid_Creator_Owner,
|
|
acltype,
|
|
access_mask,
|
|
SEC_ACE_FLAG_CONTAINER_INHERIT|
|
|
SEC_ACE_FLAG_OBJECT_INHERIT|
|
|
SEC_ACE_FLAG_INHERIT_ONLY);
|
|
access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
|
|
(mode << 3) & 0700, false);
|
|
init_sec_ace(&new_ace_list[num_aces+1],
|
|
&global_sid_Creator_Group,
|
|
acltype,
|
|
access_mask,
|
|
SEC_ACE_FLAG_CONTAINER_INHERIT|
|
|
SEC_ACE_FLAG_OBJECT_INHERIT|
|
|
SEC_ACE_FLAG_INHERIT_ONLY);
|
|
access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
|
|
(mode << 6) & 0700, false);
|
|
init_sec_ace(&new_ace_list[num_aces+2],
|
|
&global_sid_World,
|
|
acltype,
|
|
access_mask,
|
|
SEC_ACE_FLAG_CONTAINER_INHERIT|
|
|
SEC_ACE_FLAG_OBJECT_INHERIT|
|
|
SEC_ACE_FLAG_INHERIT_ONLY);
|
|
psd->dacl->aces = new_ace_list;
|
|
psd->dacl->num_aces += 3;
|
|
}
|
|
|
|
/*******************************************************************
|
|
Pull a DATA_BLOB from an xattr given a pathname.
|
|
If the hash doesn't match, or doesn't exist - return the underlying
|
|
filesystem sd.
|
|
*******************************************************************/
|
|
|
|
static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
|
|
files_struct *fsp,
|
|
const char *name,
|
|
uint32_t security_info,
|
|
struct security_descriptor **ppdesc)
|
|
{
|
|
DATA_BLOB blob;
|
|
NTSTATUS status;
|
|
uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
|
|
uint8_t hash[XATTR_SD_HASH_SIZE];
|
|
uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
|
|
struct security_descriptor *psd = NULL;
|
|
struct security_descriptor *pdesc_next = NULL;
|
|
bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
|
|
ACL_MODULE_NAME,
|
|
"ignore system acls",
|
|
false);
|
|
|
|
if (fsp && name == NULL) {
|
|
name = fsp->fsp_name->base_name;
|
|
}
|
|
|
|
DEBUG(10, ("get_nt_acl_internal: name=%s\n", name));
|
|
|
|
/* Get the full underlying sd for the hash
|
|
or to return as backup. */
|
|
if (fsp) {
|
|
status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
|
|
fsp,
|
|
HASH_SECURITY_INFO,
|
|
&pdesc_next);
|
|
} else {
|
|
status = SMB_VFS_NEXT_GET_NT_ACL(handle,
|
|
name,
|
|
HASH_SECURITY_INFO,
|
|
&pdesc_next);
|
|
}
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
|
|
"returned %s\n",
|
|
name,
|
|
nt_errstr(status)));
|
|
return status;
|
|
}
|
|
|
|
status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
|
|
nt_errstr(status)));
|
|
psd = pdesc_next;
|
|
goto out;
|
|
}
|
|
|
|
status = parse_acl_blob(&blob, &psd,
|
|
&hash_type, &hash[0]);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(10, ("parse_acl_blob returned %s\n",
|
|
nt_errstr(status)));
|
|
psd = pdesc_next;
|
|
goto out;
|
|
}
|
|
|
|
/* Ensure the hash type is one we know. */
|
|
switch (hash_type) {
|
|
case XATTR_SD_HASH_TYPE_NONE:
|
|
/* No hash, just return blob sd. */
|
|
goto out;
|
|
case XATTR_SD_HASH_TYPE_SHA256:
|
|
break;
|
|
default:
|
|
DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
|
|
"mismatch (%u) for file %s\n",
|
|
(unsigned int)hash_type,
|
|
name));
|
|
TALLOC_FREE(psd);
|
|
psd = pdesc_next;
|
|
goto out;
|
|
}
|
|
|
|
if (ignore_file_system_acl) {
|
|
goto out;
|
|
}
|
|
|
|
status = hash_sd_sha256(pdesc_next, hash_tmp);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
TALLOC_FREE(psd);
|
|
psd = pdesc_next;
|
|
goto out;
|
|
}
|
|
|
|
if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
|
|
/* Hash matches, return blob sd. */
|
|
DEBUG(10, ("get_nt_acl_internal: blob hash "
|
|
"matches for file %s\n",
|
|
name ));
|
|
goto out;
|
|
}
|
|
|
|
/* Hash doesn't match, return underlying sd. */
|
|
TALLOC_FREE(psd);
|
|
psd = pdesc_next;
|
|
|
|
out:
|
|
|
|
if (psd != pdesc_next) {
|
|
/* We're returning the blob, throw
|
|
* away the filesystem SD. */
|
|
TALLOC_FREE(pdesc_next);
|
|
} else {
|
|
SMB_STRUCT_STAT sbuf;
|
|
SMB_STRUCT_STAT *psbuf = &sbuf;
|
|
bool is_directory = false;
|
|
/*
|
|
* We're returning the underlying ACL from the
|
|
* filesystem. If it's a directory, and has no
|
|
* inheritable ACE entries we have to fake them.
|
|
*/
|
|
if (fsp) {
|
|
status = vfs_stat_fsp(fsp);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
psbuf = &fsp->fsp_name->st;
|
|
} else {
|
|
int ret = vfs_stat_smb_fname(handle->conn,
|
|
name,
|
|
&sbuf);
|
|
if (ret == -1) {
|
|
return map_nt_error_from_unix(errno);
|
|
}
|
|
}
|
|
is_directory = S_ISDIR(sbuf.st_ex_mode);
|
|
|
|
if (ignore_file_system_acl) {
|
|
TALLOC_FREE(pdesc_next);
|
|
status = make_default_filesystem_acl(talloc_tos(),
|
|
name,
|
|
psbuf,
|
|
&psd);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
} else {
|
|
if (is_directory &&
|
|
!sd_has_inheritable_components(psd,
|
|
true)) {
|
|
add_directory_inheritable_components(handle,
|
|
name,
|
|
psbuf,
|
|
psd);
|
|
}
|
|
/* The underlying POSIX module always sets
|
|
the ~SEC_DESC_DACL_PROTECTED bit, as ACLs
|
|
can't be inherited in this way under POSIX.
|
|
Remove it for Windows-style ACLs. */
|
|
psd->type &= ~SEC_DESC_DACL_PROTECTED;
|
|
}
|
|
}
|
|
|
|
if (!(security_info & SECINFO_OWNER)) {
|
|
psd->owner_sid = NULL;
|
|
}
|
|
if (!(security_info & SECINFO_GROUP)) {
|
|
psd->group_sid = NULL;
|
|
}
|
|
if (!(security_info & SECINFO_DACL)) {
|
|
psd->dacl = NULL;
|
|
}
|
|
if (!(security_info & SECINFO_SACL)) {
|
|
psd->sacl = NULL;
|
|
}
|
|
|
|
TALLOC_FREE(blob.data);
|
|
*ppdesc = psd;
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
|
|
name ));
|
|
NDR_PRINT_DEBUG(security_descriptor, psd);
|
|
}
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*********************************************************************
|
|
Create a default ACL by inheriting from the parent. If no inheritance
|
|
from the parent available, don't set anything. This will leave the actual
|
|
permissions the new file or directory already got from the filesystem
|
|
as the NT ACL when read.
|
|
*********************************************************************/
|
|
|
|
static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
|
|
files_struct *fsp,
|
|
struct security_descriptor *parent_desc,
|
|
bool is_directory)
|
|
{
|
|
TALLOC_CTX *ctx = talloc_tos();
|
|
NTSTATUS status = NT_STATUS_OK;
|
|
struct security_descriptor *psd = NULL;
|
|
struct dom_sid *owner_sid = NULL;
|
|
struct dom_sid *group_sid = NULL;
|
|
bool inherit_owner = lp_inherit_owner(SNUM(handle->conn));
|
|
size_t size;
|
|
|
|
if (!sd_has_inheritable_components(parent_desc, is_directory)) {
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/* Create an inherited descriptor from the parent. */
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10,("inherit_new_acl: parent acl for %s is:\n",
|
|
fsp_str_dbg(fsp) ));
|
|
NDR_PRINT_DEBUG(security_descriptor, parent_desc);
|
|
}
|
|
|
|
/* Inherit from parent descriptor if "inherit owner" set. */
|
|
if (inherit_owner) {
|
|
owner_sid = parent_desc->owner_sid;
|
|
group_sid = parent_desc->group_sid;
|
|
}
|
|
|
|
if (owner_sid == NULL) {
|
|
owner_sid = &handle->conn->session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
|
|
}
|
|
if (group_sid == NULL) {
|
|
group_sid = &handle->conn->session_info->security_token->sids[PRIMARY_GROUP_SID_INDEX];
|
|
}
|
|
|
|
status = se_create_child_secdesc(ctx,
|
|
&psd,
|
|
&size,
|
|
parent_desc,
|
|
owner_sid,
|
|
group_sid,
|
|
is_directory);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10,("inherit_new_acl: child acl for %s is:\n",
|
|
fsp_str_dbg(fsp) ));
|
|
NDR_PRINT_DEBUG(security_descriptor, psd);
|
|
}
|
|
|
|
if (inherit_owner) {
|
|
/* We need to be root to force this. */
|
|
become_root();
|
|
}
|
|
status = SMB_VFS_FSET_NT_ACL(fsp,
|
|
(SECINFO_OWNER |
|
|
SECINFO_GROUP |
|
|
SECINFO_DACL),
|
|
psd);
|
|
if (inherit_owner) {
|
|
unbecome_root();
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static NTSTATUS get_parent_acl_common(vfs_handle_struct *handle,
|
|
const char *path,
|
|
struct security_descriptor **pp_parent_desc)
|
|
{
|
|
char *parent_name = NULL;
|
|
NTSTATUS status;
|
|
|
|
if (!parent_dirname(talloc_tos(), path, &parent_name, NULL)) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
status = get_nt_acl_internal(handle,
|
|
NULL,
|
|
parent_name,
|
|
(SECINFO_OWNER |
|
|
SECINFO_GROUP |
|
|
SECINFO_DACL),
|
|
pp_parent_desc);
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(10,("get_parent_acl_common: get_nt_acl_internal "
|
|
"on directory %s for "
|
|
"path %s returned %s\n",
|
|
parent_name,
|
|
path,
|
|
nt_errstr(status) ));
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static NTSTATUS check_parent_acl_common(vfs_handle_struct *handle,
|
|
const char *path,
|
|
uint32_t access_mask,
|
|
struct security_descriptor **pp_parent_desc)
|
|
{
|
|
char *parent_name = NULL;
|
|
struct security_descriptor *parent_desc = NULL;
|
|
uint32_t access_granted = 0;
|
|
NTSTATUS status;
|
|
|
|
status = get_parent_acl_common(handle, path, &parent_desc);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
if (pp_parent_desc) {
|
|
*pp_parent_desc = parent_desc;
|
|
}
|
|
status = smb1_file_se_access_check(handle->conn,
|
|
parent_desc,
|
|
get_current_nttok(handle->conn),
|
|
access_mask,
|
|
&access_granted);
|
|
if(!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(10,("check_parent_acl_common: access check "
|
|
"on directory %s for "
|
|
"path %s for mask 0x%x returned %s\n",
|
|
parent_name,
|
|
path,
|
|
access_mask,
|
|
nt_errstr(status) ));
|
|
return status;
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*********************************************************************
|
|
Check ACL on open. For new files inherit from parent directory.
|
|
*********************************************************************/
|
|
|
|
static int open_acl_common(vfs_handle_struct *handle,
|
|
struct smb_filename *smb_fname,
|
|
files_struct *fsp,
|
|
int flags,
|
|
mode_t mode)
|
|
{
|
|
uint32_t access_granted = 0;
|
|
struct security_descriptor *pdesc = NULL;
|
|
bool file_existed = true;
|
|
char *fname = NULL;
|
|
NTSTATUS status;
|
|
|
|
if (fsp->base_fsp) {
|
|
/* Stream open. Base filename open already did the ACL check. */
|
|
DEBUG(10,("open_acl_common: stream open on %s\n",
|
|
fsp_str_dbg(fsp) ));
|
|
return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
|
|
}
|
|
|
|
status = get_full_smb_filename(talloc_tos(), smb_fname,
|
|
&fname);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto err;
|
|
}
|
|
|
|
status = get_nt_acl_internal(handle,
|
|
NULL,
|
|
fname,
|
|
(SECINFO_OWNER |
|
|
SECINFO_GROUP |
|
|
SECINFO_DACL),
|
|
&pdesc);
|
|
if (NT_STATUS_IS_OK(status)) {
|
|
/* See if we can access it. */
|
|
status = smb1_file_se_access_check(handle->conn,
|
|
pdesc,
|
|
get_current_nttok(handle->conn),
|
|
fsp->access_mask,
|
|
&access_granted);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(10,("open_acl_xattr: %s open "
|
|
"refused with error %s\n",
|
|
fsp_str_dbg(fsp),
|
|
nt_errstr(status) ));
|
|
goto err;
|
|
}
|
|
} else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
|
|
file_existed = false;
|
|
/*
|
|
* If O_CREAT is true then we're trying to create a file.
|
|
* Check the parent directory ACL will allow this.
|
|
*/
|
|
if (flags & O_CREAT) {
|
|
struct security_descriptor *parent_desc = NULL;
|
|
struct security_descriptor **pp_psd = NULL;
|
|
|
|
status = check_parent_acl_common(handle, fname,
|
|
SEC_DIR_ADD_FILE, &parent_desc);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto err;
|
|
}
|
|
|
|
/* Cache the parent security descriptor for
|
|
* later use. */
|
|
|
|
pp_psd = VFS_ADD_FSP_EXTENSION(handle,
|
|
fsp,
|
|
struct security_descriptor *,
|
|
NULL);
|
|
if (!pp_psd) {
|
|
status = NT_STATUS_NO_MEMORY;
|
|
goto err;
|
|
}
|
|
|
|
*pp_psd = parent_desc;
|
|
status = NT_STATUS_OK;
|
|
}
|
|
}
|
|
|
|
DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
|
|
"%s returned %s\n",
|
|
fsp_str_dbg(fsp),
|
|
nt_errstr(status) ));
|
|
|
|
fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
|
|
return fsp->fh->fd;
|
|
|
|
err:
|
|
|
|
errno = map_errno_from_nt_status(status);
|
|
return -1;
|
|
}
|
|
|
|
static int mkdir_acl_common(vfs_handle_struct *handle, const char *path, mode_t mode)
|
|
{
|
|
int ret;
|
|
NTSTATUS status;
|
|
SMB_STRUCT_STAT sbuf;
|
|
|
|
ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
|
|
if (ret == -1 && errno == ENOENT) {
|
|
/* We're creating a new directory. */
|
|
status = check_parent_acl_common(handle, path,
|
|
SEC_DIR_ADD_SUBDIR, NULL);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
errno = map_errno_from_nt_status(status);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return SMB_VFS_NEXT_MKDIR(handle, path, mode);
|
|
}
|
|
|
|
/*********************************************************************
|
|
Fetch a security descriptor given an fsp.
|
|
*********************************************************************/
|
|
|
|
static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
|
|
uint32_t security_info, struct security_descriptor **ppdesc)
|
|
{
|
|
return get_nt_acl_internal(handle, fsp,
|
|
NULL, security_info, ppdesc);
|
|
}
|
|
|
|
/*********************************************************************
|
|
Fetch a security descriptor given a pathname.
|
|
*********************************************************************/
|
|
|
|
static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
|
|
const char *name, uint32_t security_info, struct security_descriptor **ppdesc)
|
|
{
|
|
return get_nt_acl_internal(handle, NULL,
|
|
name, security_info, ppdesc);
|
|
}
|
|
|
|
/*********************************************************************
|
|
Store a security descriptor given an fsp.
|
|
*********************************************************************/
|
|
|
|
static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
|
|
uint32_t security_info_sent, const struct security_descriptor *orig_psd)
|
|
{
|
|
NTSTATUS status;
|
|
DATA_BLOB blob;
|
|
struct security_descriptor *pdesc_next = NULL;
|
|
struct security_descriptor *psd = NULL;
|
|
uint8_t hash[XATTR_SD_HASH_SIZE];
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
|
|
fsp_str_dbg(fsp)));
|
|
NDR_PRINT_DEBUG(security_descriptor,
|
|
CONST_DISCARD(struct security_descriptor *,orig_psd));
|
|
}
|
|
|
|
status = get_nt_acl_internal(handle, fsp,
|
|
NULL,
|
|
SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
|
|
&psd);
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
psd->revision = orig_psd->revision;
|
|
/* All our SD's are self relative. */
|
|
psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
|
|
|
|
if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
|
|
psd->owner_sid = orig_psd->owner_sid;
|
|
}
|
|
if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
|
|
psd->group_sid = orig_psd->group_sid;
|
|
}
|
|
if (security_info_sent & SECINFO_DACL) {
|
|
psd->dacl = orig_psd->dacl;
|
|
psd->type |= SEC_DESC_DACL_PRESENT;
|
|
}
|
|
if (security_info_sent & SECINFO_SACL) {
|
|
psd->sacl = orig_psd->sacl;
|
|
psd->type |= SEC_DESC_SACL_PRESENT;
|
|
}
|
|
|
|
status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
/* Get the full underlying sd, then hash. */
|
|
status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
|
|
fsp,
|
|
HASH_SECURITY_INFO,
|
|
&pdesc_next);
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
status = hash_sd_sha256(pdesc_next, hash);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
|
|
fsp_str_dbg(fsp)));
|
|
NDR_PRINT_DEBUG(security_descriptor,
|
|
CONST_DISCARD(struct security_descriptor *,psd));
|
|
}
|
|
create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
|
|
store_acl_blob_fsp(handle, fsp, &blob);
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
static SMB_STRUCT_DIR *opendir_acl_common(vfs_handle_struct *handle,
|
|
const char *fname, const char *mask, uint32 attr)
|
|
{
|
|
NTSTATUS status = check_parent_acl_common(handle, fname,
|
|
SEC_DIR_LIST, NULL);
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
errno = map_errno_from_nt_status(status);
|
|
return NULL;
|
|
}
|
|
return SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
|
|
}
|
|
|
|
static int acl_common_remove_object(vfs_handle_struct *handle,
|
|
const char *path,
|
|
bool is_directory)
|
|
{
|
|
connection_struct *conn = handle->conn;
|
|
struct file_id id;
|
|
files_struct *fsp = NULL;
|
|
int ret = 0;
|
|
char *parent_dir = NULL;
|
|
const char *final_component = NULL;
|
|
struct smb_filename local_fname;
|
|
int saved_errno = 0;
|
|
|
|
if (!parent_dirname(talloc_tos(), path,
|
|
&parent_dir, &final_component)) {
|
|
saved_errno = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
|
|
is_directory ? "directory" : "file",
|
|
parent_dir, final_component ));
|
|
|
|
/* cd into the parent dir to pin it. */
|
|
ret = SMB_VFS_CHDIR(conn, parent_dir);
|
|
if (ret == -1) {
|
|
saved_errno = errno;
|
|
goto out;
|
|
}
|
|
|
|
ZERO_STRUCT(local_fname);
|
|
local_fname.base_name = CONST_DISCARD(char *,final_component);
|
|
|
|
/* Must use lstat here. */
|
|
ret = SMB_VFS_LSTAT(conn, &local_fname);
|
|
if (ret == -1) {
|
|
saved_errno = errno;
|
|
goto out;
|
|
}
|
|
|
|
/* Ensure we have this file open with DELETE access. */
|
|
id = vfs_file_id_from_sbuf(conn, &local_fname.st);
|
|
for (fsp = file_find_di_first(conn->sconn, id); fsp;
|
|
file_find_di_next(fsp)) {
|
|
if (fsp->access_mask & DELETE_ACCESS &&
|
|
fsp->delete_on_close) {
|
|
/* We did open this for delete,
|
|
* allow the delete as root.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!fsp) {
|
|
DEBUG(10,("acl_common_remove_object: %s %s/%s "
|
|
"not an open file\n",
|
|
is_directory ? "directory" : "file",
|
|
parent_dir, final_component ));
|
|
saved_errno = EACCES;
|
|
goto out;
|
|
}
|
|
|
|
become_root();
|
|
if (is_directory) {
|
|
ret = SMB_VFS_NEXT_RMDIR(handle, final_component);
|
|
} else {
|
|
ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
|
|
}
|
|
unbecome_root();
|
|
|
|
if (ret == -1) {
|
|
saved_errno = errno;
|
|
}
|
|
|
|
out:
|
|
|
|
TALLOC_FREE(parent_dir);
|
|
|
|
vfs_ChDir(conn, conn->connectpath);
|
|
if (saved_errno) {
|
|
errno = saved_errno;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int rmdir_acl_common(struct vfs_handle_struct *handle,
|
|
const char *path)
|
|
{
|
|
int ret;
|
|
|
|
ret = SMB_VFS_NEXT_RMDIR(handle, path);
|
|
if (!(ret == -1 && (errno == EACCES || errno == EPERM))) {
|
|
DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
|
|
path,
|
|
strerror(errno) ));
|
|
return ret;
|
|
}
|
|
|
|
return acl_common_remove_object(handle,
|
|
path,
|
|
true);
|
|
}
|
|
|
|
static NTSTATUS create_file_acl_common(struct vfs_handle_struct *handle,
|
|
struct smb_request *req,
|
|
uint16_t root_dir_fid,
|
|
struct smb_filename *smb_fname,
|
|
uint32_t access_mask,
|
|
uint32_t share_access,
|
|
uint32_t create_disposition,
|
|
uint32_t create_options,
|
|
uint32_t file_attributes,
|
|
uint32_t oplock_request,
|
|
uint64_t allocation_size,
|
|
uint32_t private_flags,
|
|
struct security_descriptor *sd,
|
|
struct ea_list *ea_list,
|
|
files_struct **result,
|
|
int *pinfo)
|
|
{
|
|
NTSTATUS status, status1;
|
|
files_struct *fsp = NULL;
|
|
int info;
|
|
struct security_descriptor *parent_sd = NULL;
|
|
struct security_descriptor **pp_parent_sd = NULL;
|
|
|
|
status = SMB_VFS_NEXT_CREATE_FILE(handle,
|
|
req,
|
|
root_dir_fid,
|
|
smb_fname,
|
|
access_mask,
|
|
share_access,
|
|
create_disposition,
|
|
create_options,
|
|
file_attributes,
|
|
oplock_request,
|
|
allocation_size,
|
|
private_flags,
|
|
sd,
|
|
ea_list,
|
|
result,
|
|
&info);
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto out;
|
|
}
|
|
|
|
if (info != FILE_WAS_CREATED) {
|
|
/* File/directory was opened, not created. */
|
|
goto out;
|
|
}
|
|
|
|
fsp = *result;
|
|
|
|
if (fsp == NULL) {
|
|
/* Only handle success. */
|
|
goto out;
|
|
}
|
|
|
|
if (sd) {
|
|
/* Security descriptor already set. */
|
|
goto out;
|
|
}
|
|
|
|
if (fsp->base_fsp) {
|
|
/* Stream open. */
|
|
goto out;
|
|
}
|
|
|
|
/* See if we have a cached parent sd, if so, use it. */
|
|
pp_parent_sd = (struct security_descriptor **)VFS_FETCH_FSP_EXTENSION(handle, fsp);
|
|
if (!pp_parent_sd) {
|
|
/* Must be a directory, fetch again (sigh). */
|
|
status = get_parent_acl_common(handle,
|
|
fsp->fsp_name->base_name,
|
|
&parent_sd);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto out;
|
|
}
|
|
} else {
|
|
parent_sd = *pp_parent_sd;
|
|
}
|
|
|
|
if (!parent_sd) {
|
|
goto err;
|
|
}
|
|
|
|
/* New directory - inherit from parent. */
|
|
status1 = inherit_new_acl(handle, fsp, parent_sd, fsp->is_directory);
|
|
|
|
if (!NT_STATUS_IS_OK(status1)) {
|
|
DEBUG(1,("create_file_acl_common: error setting "
|
|
"sd for %s (%s)\n",
|
|
fsp_str_dbg(fsp),
|
|
nt_errstr(status1) ));
|
|
}
|
|
|
|
out:
|
|
|
|
if (fsp) {
|
|
VFS_REMOVE_FSP_EXTENSION(handle, fsp);
|
|
}
|
|
|
|
if (NT_STATUS_IS_OK(status) && pinfo) {
|
|
*pinfo = info;
|
|
}
|
|
return status;
|
|
|
|
err:
|
|
|
|
smb_panic("create_file_acl_common: logic error.\n");
|
|
/* NOTREACHED */
|
|
return status;
|
|
}
|
|
|
|
static int unlink_acl_common(struct vfs_handle_struct *handle,
|
|
const struct smb_filename *smb_fname)
|
|
{
|
|
int ret;
|
|
|
|
ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
|
|
if (!(ret == -1 && (errno == EACCES || errno == EPERM))) {
|
|
DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
|
|
smb_fname->base_name,
|
|
strerror(errno) ));
|
|
return ret;
|
|
}
|
|
/* Don't do anything fancy for streams. */
|
|
if (smb_fname->stream_name) {
|
|
return ret;
|
|
}
|
|
|
|
return acl_common_remove_object(handle,
|
|
smb_fname->base_name,
|
|
false);
|
|
}
|
|
|
|
static int chmod_acl_module_common(struct vfs_handle_struct *handle,
|
|
const char *path, mode_t mode)
|
|
{
|
|
if (lp_posix_pathnames()) {
|
|
/* Only allow this on POSIX pathnames. */
|
|
return SMB_VFS_NEXT_CHMOD(handle, path, mode);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
|
|
struct files_struct *fsp, mode_t mode)
|
|
{
|
|
if (fsp->posix_open) {
|
|
/* Only allow this on POSIX opens. */
|
|
return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
|
|
const char *name, mode_t mode)
|
|
{
|
|
if (lp_posix_pathnames()) {
|
|
/* Only allow this on POSIX pathnames. */
|
|
return SMB_VFS_NEXT_CHMOD_ACL(handle, name, mode);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
|
|
struct files_struct *fsp, mode_t mode)
|
|
{
|
|
if (fsp->posix_open) {
|
|
/* Only allow this on POSIX opens. */
|
|
return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
|
|
}
|
|
return 0;
|
|
}
|