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samba-mirror/source3/modules/vfs_nfs4acl_xattr.c
Stefan Metzmacher dacc86effb s3:vfs_nfs4acl_xattr: fix compiler warnings
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
2015-05-19 13:43:13 +02:00

651 lines
18 KiB
C

/*
* Convert NFSv4 acls stored per http://www.suse.de/~agruen/nfs4acl/ to NT acls and vice versa.
*
* Copyright (C) Jiri Sasek, 2007
* based on the foobar.c module which is copyrighted by Volker Lendecke
* based on pvfs_acl_nfs4.c Copyright (C) Andrew Tridgell 2006
*
* based on vfs_fake_acls:
* Copyright (C) Tim Potter, 1999-2000
* Copyright (C) Alexander Bokovoy, 2002
* Copyright (C) Andrew Bartlett, 2002,2012
*
* 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 "system/filesys.h"
#include "smbd/smbd.h"
#include "nfs4_acls.h"
#include "librpc/gen_ndr/ndr_nfs4acl.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS
static struct nfs4acl *nfs4acl_blob2acl(DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
{
enum ndr_err_code ndr_err;
struct nfs4acl *acl = talloc(mem_ctx, struct nfs4acl);
if (!acl) {
errno = ENOMEM;
return NULL;
}
ndr_err = ndr_pull_struct_blob(blob, acl, acl,
(ndr_pull_flags_fn_t)ndr_pull_nfs4acl);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0, ("ndr_pull_acl_t failed: %s\n",
ndr_errstr(ndr_err)));
TALLOC_FREE(acl);
return NULL;
}
return acl;
}
static DATA_BLOB nfs4acl_acl2blob(TALLOC_CTX *mem_ctx, struct nfs4acl *acl)
{
enum ndr_err_code ndr_err;
DATA_BLOB blob;
ndr_err = ndr_push_struct_blob(&blob, mem_ctx, acl,
(ndr_push_flags_fn_t)ndr_push_nfs4acl);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0, ("ndr_push_acl_t failed: %s\n",
ndr_errstr(ndr_err)));
return data_blob_null;
}
return blob;
}
static NTSTATUS nfs4_get_nfs4_acl_common(TALLOC_CTX *mem_ctx,
DATA_BLOB *blob,
SMB4ACL_T **ppacl)
{
int i;
struct nfs4acl *nfs4acl = NULL;
SMB4ACL_T *pacl = NULL;
TALLOC_CTX *frame = talloc_stackframe();
nfs4acl = nfs4acl_blob2acl(blob, frame);
/* create SMB4ACL data */
if((pacl = smb_create_smb4acl(mem_ctx)) == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
for(i=0; i<nfs4acl->a_count; i++) {
SMB_ACE4PROP_T aceprop;
aceprop.aceType = (uint32_t) nfs4acl->ace[i].e_type;
aceprop.aceFlags = (uint32_t) nfs4acl->ace[i].e_flags;
aceprop.aceMask = (uint32_t) nfs4acl->ace[i].e_mask;
aceprop.who.id = (uint32_t) nfs4acl->ace[i].e_id;
if (!strcmp(nfs4acl->ace[i].e_who,
NFS4ACL_XATTR_OWNER_WHO)) {
aceprop.flags = SMB_ACE4_ID_SPECIAL;
aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
} else if (!strcmp(nfs4acl->ace[i].e_who,
NFS4ACL_XATTR_GROUP_WHO)) {
aceprop.flags = SMB_ACE4_ID_SPECIAL;
aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
} else if (!strcmp(nfs4acl->ace[i].e_who,
NFS4ACL_XATTR_EVERYONE_WHO)) {
aceprop.flags = SMB_ACE4_ID_SPECIAL;
aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
} else {
aceprop.flags = 0;
}
if(smb_add_ace4(pacl, &aceprop) == NULL) {
TALLOC_FREE(frame);
return NT_STATUS_NO_MEMORY;
}
}
*ppacl = pacl;
TALLOC_FREE(frame);
return NT_STATUS_OK;
}
/* Fetch the NFSv4 ACL from the xattr, and convert into Samba's internal NFSv4 format */
static NTSTATUS nfs4_fget_nfs4_acl(vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
files_struct *fsp, SMB4ACL_T **ppacl)
{
NTSTATUS status;
DATA_BLOB blob = data_blob_null;
ssize_t length;
TALLOC_CTX *frame = talloc_stackframe();
do {
blob.length += 1000;
blob.data = talloc_realloc(frame, blob.data, uint8_t, blob.length);
if (!blob.data) {
TALLOC_FREE(frame);
errno = ENOMEM;
return NT_STATUS_NO_MEMORY;
}
length = SMB_VFS_NEXT_FGETXATTR(handle, fsp, NFS4ACL_XATTR_NAME, blob.data, blob.length);
blob.length = length;
} while (length == -1 && errno == ERANGE);
if (length == -1) {
TALLOC_FREE(frame);
return map_nt_error_from_unix(errno);
}
status = nfs4_get_nfs4_acl_common(mem_ctx, &blob, ppacl);
TALLOC_FREE(frame);
return status;
}
/* Fetch the NFSv4 ACL from the xattr, and convert into Samba's internal NFSv4 format */
static NTSTATUS nfs4_get_nfs4_acl(vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
const char *path, SMB4ACL_T **ppacl)
{
NTSTATUS status;
DATA_BLOB blob = data_blob_null;
ssize_t length;
TALLOC_CTX *frame = talloc_stackframe();
do {
blob.length += 1000;
blob.data = talloc_realloc(frame, blob.data, uint8_t, blob.length);
if (!blob.data) {
TALLOC_FREE(frame);
errno = ENOMEM;
return NT_STATUS_NO_MEMORY;
}
length = SMB_VFS_NEXT_GETXATTR(handle, path, NFS4ACL_XATTR_NAME, blob.data, blob.length);
blob.length = length;
} while (length == -1 && errno == ERANGE);
if (length == -1) {
TALLOC_FREE(frame);
return map_nt_error_from_unix(errno);
}
status = nfs4_get_nfs4_acl_common(mem_ctx, &blob, ppacl);
TALLOC_FREE(frame);
return status;
}
static bool nfs4acl_smb4acl2nfs4acl(TALLOC_CTX *mem_ctx,
SMB4ACL_T *smbacl,
struct nfs4acl **pnfs4acl,
bool denymissingspecial)
{
struct nfs4acl *nfs4acl;
SMB4ACE_T *smbace;
bool have_special_id = false;
int i;
/* allocate the field of NFS4 aces */
nfs4acl = talloc_zero(mem_ctx, struct nfs4acl);
if(nfs4acl == NULL) {
errno = ENOMEM;
return false;
}
nfs4acl->a_count = smb_get_naces(smbacl);
nfs4acl->ace = talloc_zero_array(nfs4acl, struct nfs4ace,
nfs4acl->a_count);
if(nfs4acl->ace == NULL) {
TALLOC_FREE(nfs4acl);
errno = ENOMEM;
return false;
}
/* handle all aces */
for(smbace = smb_first_ace4(smbacl), i = 0;
smbace!=NULL;
smbace = smb_next_ace4(smbace), i++) {
SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace);
nfs4acl->ace[i].e_type = aceprop->aceType;
nfs4acl->ace[i].e_flags = aceprop->aceFlags;
nfs4acl->ace[i].e_mask = aceprop->aceMask;
nfs4acl->ace[i].e_id = aceprop->who.id;
if(aceprop->flags & SMB_ACE4_ID_SPECIAL) {
switch(aceprop->who.special_id) {
case SMB_ACE4_WHO_EVERYONE:
nfs4acl->ace[i].e_who =
NFS4ACL_XATTR_EVERYONE_WHO;
break;
case SMB_ACE4_WHO_OWNER:
nfs4acl->ace[i].e_who =
NFS4ACL_XATTR_OWNER_WHO;
break;
case SMB_ACE4_WHO_GROUP:
nfs4acl->ace[i].e_who =
NFS4ACL_XATTR_GROUP_WHO;
break;
default:
DEBUG(8, ("unsupported special_id %d\n", \
aceprop->who.special_id));
continue; /* don't add it !!! */
}
have_special_id = true;
} else {
nfs4acl->ace[i].e_who = "";
}
}
if (!have_special_id && denymissingspecial) {
TALLOC_FREE(nfs4acl);
errno = EACCES;
return false;
}
SMB_ASSERT(i == nfs4acl->a_count);
*pnfs4acl = nfs4acl;
return true;
}
static bool nfs4acl_xattr_set_smb4acl(vfs_handle_struct *handle,
const char *path,
SMB4ACL_T *smbacl)
{
TALLOC_CTX *frame = talloc_stackframe();
struct nfs4acl *nfs4acl;
int ret;
bool denymissingspecial;
DATA_BLOB blob;
denymissingspecial = lp_parm_bool(handle->conn->params->service,
"nfs4acl_xattr",
"denymissingspecial", false);
if (!nfs4acl_smb4acl2nfs4acl(frame, smbacl, &nfs4acl,
denymissingspecial)) {
DEBUG(0, ("Failed to convert smb ACL to nfs4 ACL.\n"));
TALLOC_FREE(frame);
return false;
}
blob = nfs4acl_acl2blob(frame, nfs4acl);
if (!blob.data) {
DEBUG(0, ("Failed to convert ACL to linear blob for xattr\n"));
TALLOC_FREE(frame);
errno = EINVAL;
return false;
}
ret = SMB_VFS_NEXT_SETXATTR(handle, path, NFS4ACL_XATTR_NAME,
blob.data, blob.length, 0);
if (ret != 0) {
DEBUG(0, ("can't store acl in xattr: %s\n", strerror(errno)));
}
TALLOC_FREE(frame);
return ret == 0;
}
/* call-back function processing the NT acl -> NFS4 acl using NFSv4 conv. */
static bool nfs4acl_xattr_fset_smb4acl(vfs_handle_struct *handle,
files_struct *fsp,
SMB4ACL_T *smbacl)
{
TALLOC_CTX *frame = talloc_stackframe();
struct nfs4acl *nfs4acl;
int ret;
bool denymissingspecial;
DATA_BLOB blob;
denymissingspecial = lp_parm_bool(fsp->conn->params->service,
"nfs4acl_xattr",
"denymissingspecial", false);
if (!nfs4acl_smb4acl2nfs4acl(frame, smbacl, &nfs4acl,
denymissingspecial)) {
DEBUG(0, ("Failed to convert smb ACL to nfs4 ACL.\n"));
TALLOC_FREE(frame);
return false;
}
blob = nfs4acl_acl2blob(frame, nfs4acl);
if (!blob.data) {
DEBUG(0, ("Failed to convert ACL to linear blob for xattr\n"));
TALLOC_FREE(frame);
errno = EINVAL;
return false;
}
if (fsp->fh->fd == -1) {
DEBUG(0, ("Error: fsp->fh->fd == -1\n"));
}
ret = SMB_VFS_NEXT_FSETXATTR(handle, fsp, NFS4ACL_XATTR_NAME,
blob.data, blob.length, 0);
if (ret != 0) {
DEBUG(0, ("can't store acl in xattr: %s\n", strerror(errno)));
}
TALLOC_FREE(frame);
return ret == 0;
}
/* nfs4_set_nt_acl()
* set the local file's acls obtaining it in NT form
* using the NFSv4 format conversion
*/
static NTSTATUS nfs4_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
uint32_t security_info_sent,
const struct security_descriptor *psd)
{
return smb_set_nt_acl_nfs4(handle, fsp, security_info_sent, psd,
nfs4acl_xattr_fset_smb4acl);
}
static SMB4ACL_T *nfs4acls_defaultacl(TALLOC_CTX *mem_ctx)
{
SMB4ACL_T *pacl = NULL;
SMB4ACE_T *pace;
SMB_ACE4PROP_T ace = {
.flags = SMB_ACE4_ID_SPECIAL,
.who = {
.id = SMB_ACE4_WHO_EVERYONE,
},
.aceType = SMB_ACE4_ACCESS_ALLOWED_ACE_TYPE,
.aceFlags = 0,
.aceMask = SMB_ACE4_ALL_MASKS,
};
DEBUG(10, ("Building default full access acl\n"));
pacl = smb_create_smb4acl(mem_ctx);
if (pacl == NULL) {
DEBUG(0, ("talloc failed\n"));
errno = ENOMEM;
return NULL;
}
pace = smb_add_ace4(pacl, &ace);
if (pace == NULL) {
DEBUG(0, ("talloc failed\n"));
TALLOC_FREE(pacl);
errno = ENOMEM;
return NULL;
}
return pacl;
}
/*
* Because there is no good way to guarantee that a new xattr will be
* created on file creation there might be no acl xattr on a file when
* trying to read the acl. In this case the acl xattr will get
* constructed at that time from the parent acl.
* If the parent ACL doesn't have an xattr either the call will
* recurse to the next parent directory until the share root is
* reached. If the share root doesn't contain an ACL xattr either a
* default ACL will be used.
* Also a default ACL will be set if a non inheriting ACL is encountered.
*
* Basic algorithm:
* read acl xattr blob
* if acl xattr blob doesn't exist
* stat current directory to know if it's a file or directory
* read acl xattr blob from parent dir
* acl xattr blob to smb nfs4 acl
* calculate inherited smb nfs4 acl
* without inheritance use default smb nfs4 acl
* smb nfs4 acl to acl xattr blob
* set acl xattr blob
* return smb nfs4 acl
* else
* acl xattr blob to smb nfs4 acl
*
* Todo: Really use mem_ctx after fixing interface of nfs4_acls
*/
static SMB4ACL_T *nfs4acls_inheritacl(vfs_handle_struct *handle,
const char *path,
TALLOC_CTX *mem_ctx)
{
char *parent_dir = NULL;
SMB4ACL_T *pparentacl = NULL;
SMB4ACL_T *pchildacl = NULL;
SMB4ACE_T *pace;
SMB_ACE4PROP_T ace;
bool isdir;
struct smb_filename *smb_fname = NULL;
NTSTATUS status;
int ret;
TALLOC_CTX *frame = talloc_stackframe();
DEBUG(10, ("nfs4acls_inheritacl invoked for %s\n", path));
smb_fname = synthetic_smb_fname(frame, path, NULL, NULL);
if (smb_fname == NULL) {
TALLOC_FREE(frame);
errno = ENOMEM;
return NULL;
}
ret = SMB_VFS_STAT(handle->conn, smb_fname);
if (ret == -1) {
DEBUG(0,("nfs4acls_inheritacl: failed to stat "
"directory %s. Error was %s\n",
smb_fname_str_dbg(smb_fname),
strerror(errno)));
TALLOC_FREE(frame);
return NULL;
}
isdir = S_ISDIR(smb_fname->st.st_ex_mode);
if (!parent_dirname(talloc_tos(),
path,
&parent_dir,
NULL)) {
TALLOC_FREE(frame);
errno = ENOMEM;
return NULL;
}
status = nfs4_get_nfs4_acl(handle, frame, parent_dir, &pparentacl);
if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)
&& strncmp(parent_dir, ".", 2) != 0) {
pparentacl = nfs4acls_inheritacl(handle, parent_dir,
frame);
}
else if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
pparentacl = nfs4acls_defaultacl(frame);
}
else if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return NULL;
}
pchildacl = smb_create_smb4acl(mem_ctx);
if (pchildacl == NULL) {
DEBUG(0, ("talloc failed\n"));
TALLOC_FREE(frame);
errno = ENOMEM;
return NULL;
}
for (pace = smb_first_ace4(pparentacl); pace != NULL;
pace = smb_next_ace4(pace)) {
SMB4ACE_T *pchildace;
ace = *smb_get_ace4(pace);
if ((isdir && !(ace.aceFlags & SMB_ACE4_DIRECTORY_INHERIT_ACE)) ||
(!isdir && !(ace.aceFlags & SMB_ACE4_FILE_INHERIT_ACE))) {
DEBUG(10, ("non inheriting ace type: %d, iflags: %x, "
"flags: %x, mask: %x, who: %d\n",
ace.aceType, ace.flags, ace.aceFlags,
ace.aceMask, ace.who.id));
continue;
}
DEBUG(10, ("inheriting ace type: %d, iflags: %x, "
"flags: %x, mask: %x, who: %d\n",
ace.aceType, ace.flags, ace.aceFlags,
ace.aceMask, ace.who.id));
ace.aceFlags |= SMB_ACE4_INHERITED_ACE;
if (ace.aceFlags & SMB_ACE4_INHERIT_ONLY_ACE) {
ace.aceFlags &= ~SMB_ACE4_INHERIT_ONLY_ACE;
}
if (ace.aceFlags & SMB_ACE4_NO_PROPAGATE_INHERIT_ACE) {
ace.aceFlags &= ~SMB_ACE4_FILE_INHERIT_ACE;
ace.aceFlags &= ~SMB_ACE4_DIRECTORY_INHERIT_ACE;
ace.aceFlags &= ~SMB_ACE4_NO_PROPAGATE_INHERIT_ACE;
}
pchildace = smb_add_ace4(pchildacl, &ace);
if (pchildace == NULL) {
DEBUG(0, ("talloc failed\n"));
TALLOC_FREE(frame);
errno = ENOMEM;
return NULL;
}
}
/* Set a default ACL if we didn't inherit anything. */
if (smb_first_ace4(pchildacl) == NULL) {
TALLOC_FREE(pchildacl);
pchildacl = nfs4acls_defaultacl(mem_ctx);
}
/* store the returned ACL to get it directly in the
future and avoid dynamic inheritance behavior. */
nfs4acl_xattr_set_smb4acl(handle, path, pchildacl);
TALLOC_FREE(frame);
return pchildacl;
}
static NTSTATUS nfs4acl_xattr_fget_nt_acl(struct vfs_handle_struct *handle,
struct files_struct *fsp,
uint32_t security_info,
TALLOC_CTX *mem_ctx,
struct security_descriptor **ppdesc)
{
SMB4ACL_T *pacl;
NTSTATUS status;
TALLOC_CTX *frame = talloc_stackframe();
status = nfs4_fget_nfs4_acl(handle, frame, fsp, &pacl);
if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
pacl = nfs4acls_inheritacl(handle, fsp->fsp_name->base_name,
frame);
}
else if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
status = smb_fget_nt_acl_nfs4(fsp, security_info, mem_ctx, ppdesc, pacl);
TALLOC_FREE(frame);
return status;
}
static NTSTATUS nfs4acl_xattr_get_nt_acl(struct vfs_handle_struct *handle,
const char *name, uint32_t security_info,
TALLOC_CTX *mem_ctx,
struct security_descriptor **ppdesc)
{
SMB4ACL_T *pacl;
NTSTATUS status;
TALLOC_CTX *frame = talloc_stackframe();
status = nfs4_get_nfs4_acl(handle, frame, name, &pacl);
if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
pacl = nfs4acls_inheritacl(handle, name, frame);
}
else if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(frame);
return status;
}
status = smb_get_nt_acl_nfs4(handle->conn, name, security_info,
mem_ctx, ppdesc,
pacl);
TALLOC_FREE(frame);
return status;
}
static NTSTATUS nfs4acl_xattr_fset_nt_acl(vfs_handle_struct *handle,
files_struct *fsp,
uint32_t security_info_sent,
const struct security_descriptor *psd)
{
return nfs4_set_nt_acl(handle, fsp, security_info_sent, psd);
}
/*
As long as Samba does not support an exiplicit method for a module
to define conflicting vfs methods, we should override all conflicting
methods here. That way, we know we are using the NFSv4 storage
Function declarations taken from vfs_solarisacl
*/
static SMB_ACL_T nfs4acl_xattr_fail__sys_acl_get_file(vfs_handle_struct *handle,
const char *path_p,
SMB_ACL_TYPE_T type,
TALLOC_CTX *mem_ctx)
{
return (SMB_ACL_T)NULL;
}
static SMB_ACL_T nfs4acl_xattr_fail__sys_acl_get_fd(vfs_handle_struct *handle,
files_struct *fsp,
TALLOC_CTX *mem_ctx)
{
return (SMB_ACL_T)NULL;
}
static int nfs4acl_xattr_fail__sys_acl_set_file(vfs_handle_struct *handle,
const char *name,
SMB_ACL_TYPE_T type,
SMB_ACL_T theacl)
{
return -1;
}
static int nfs4acl_xattr_fail__sys_acl_set_fd(vfs_handle_struct *handle,
files_struct *fsp,
SMB_ACL_T theacl)
{
return -1;
}
static int nfs4acl_xattr_fail__sys_acl_delete_def_file(vfs_handle_struct *handle,
const char *path)
{
return -1;
}
static int nfs4acl_xattr_fail__sys_acl_blob_get_file(vfs_handle_struct *handle, const char *path_p, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
{
return -1;
}
static int nfs4acl_xattr_fail__sys_acl_blob_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
{
return -1;
}
/* VFS operations structure */
static struct vfs_fn_pointers nfs4acl_xattr_fns = {
.sys_acl_get_file_fn = nfs4acl_xattr_fail__sys_acl_get_file,
.sys_acl_get_fd_fn = nfs4acl_xattr_fail__sys_acl_get_fd,
.sys_acl_blob_get_file_fn = nfs4acl_xattr_fail__sys_acl_blob_get_file,
.sys_acl_blob_get_fd_fn = nfs4acl_xattr_fail__sys_acl_blob_get_fd,
.sys_acl_set_file_fn = nfs4acl_xattr_fail__sys_acl_set_file,
.sys_acl_set_fd_fn = nfs4acl_xattr_fail__sys_acl_set_fd,
.sys_acl_delete_def_file_fn = nfs4acl_xattr_fail__sys_acl_delete_def_file,
.fget_nt_acl_fn = nfs4acl_xattr_fget_nt_acl,
.get_nt_acl_fn = nfs4acl_xattr_get_nt_acl,
.fset_nt_acl_fn = nfs4acl_xattr_fset_nt_acl,
};
NTSTATUS vfs_nfs4acl_xattr_init(void);
NTSTATUS vfs_nfs4acl_xattr_init(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "nfs4acl_xattr",
&nfs4acl_xattr_fns);
}