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samba-mirror/source3/modules/vfs_posixacl.c

382 lines
8.4 KiB
C

/*
Unix SMB/Netbios implementation.
VFS module to get and set posix acls
Copyright (C) Volker Lendecke 2006
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 "modules/vfs_posixacl.h"
/* prototypes for static functions first - for clarity */
static bool smb_ace_to_internal(acl_entry_t posix_ace,
struct smb_acl_entry *ace);
static struct smb_acl_t *smb_acl_to_internal(acl_t acl);
static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm);
static acl_t smb_acl_to_posix(const struct smb_acl_t *acl);
/* public functions - the api */
SMB_ACL_T posixacl_sys_acl_get_file(vfs_handle_struct *handle,
const char *path_p,
SMB_ACL_TYPE_T type)
{
struct smb_acl_t *result;
acl_type_t acl_type;
acl_t acl;
switch(type) {
case SMB_ACL_TYPE_ACCESS:
acl_type = ACL_TYPE_ACCESS;
break;
case SMB_ACL_TYPE_DEFAULT:
acl_type = ACL_TYPE_DEFAULT;
break;
default:
errno = EINVAL;
return NULL;
}
acl = acl_get_file(path_p, acl_type);
if (acl == NULL) {
return NULL;
}
result = smb_acl_to_internal(acl);
acl_free(acl);
return result;
}
SMB_ACL_T posixacl_sys_acl_get_fd(vfs_handle_struct *handle,
files_struct *fsp)
{
struct smb_acl_t *result;
acl_t acl = acl_get_fd(fsp->fh->fd);
if (acl == NULL) {
return NULL;
}
result = smb_acl_to_internal(acl);
acl_free(acl);
return result;
}
int posixacl_sys_acl_set_file(vfs_handle_struct *handle,
const char *name,
SMB_ACL_TYPE_T type,
SMB_ACL_T theacl)
{
int res;
acl_type_t acl_type;
acl_t acl;
DEBUG(10, ("Calling acl_set_file: %s, %d\n", name, type));
switch(type) {
case SMB_ACL_TYPE_ACCESS:
acl_type = ACL_TYPE_ACCESS;
break;
case SMB_ACL_TYPE_DEFAULT:
acl_type = ACL_TYPE_DEFAULT;
break;
default:
errno = EINVAL;
return -1;
}
if ((acl = smb_acl_to_posix(theacl)) == NULL) {
return -1;
}
res = acl_set_file(name, acl_type, acl);
if (res != 0) {
DEBUG(10, ("acl_set_file failed: %s\n", strerror(errno)));
}
acl_free(acl);
return res;
}
int posixacl_sys_acl_set_fd(vfs_handle_struct *handle,
files_struct *fsp,
SMB_ACL_T theacl)
{
int res;
acl_t acl = smb_acl_to_posix(theacl);
if (acl == NULL) {
return -1;
}
res = acl_set_fd(fsp->fh->fd, acl);
acl_free(acl);
return res;
}
int posixacl_sys_acl_delete_def_file(vfs_handle_struct *handle,
const char *path)
{
return acl_delete_def_file(path);
}
/* private functions */
static bool smb_ace_to_internal(acl_entry_t posix_ace,
struct smb_acl_entry *ace)
{
acl_tag_t tag;
acl_permset_t permset;
if (acl_get_tag_type(posix_ace, &tag) != 0) {
DEBUG(0, ("smb_acl_get_tag_type failed\n"));
return False;
}
switch(tag) {
case ACL_USER:
ace->a_type = SMB_ACL_USER;
break;
case ACL_USER_OBJ:
ace->a_type = SMB_ACL_USER_OBJ;
break;
case ACL_GROUP:
ace->a_type = SMB_ACL_GROUP;
break;
case ACL_GROUP_OBJ:
ace->a_type = SMB_ACL_GROUP_OBJ;
break;
case ACL_OTHER:
ace->a_type = SMB_ACL_OTHER;
break;
case ACL_MASK:
ace->a_type = SMB_ACL_MASK;
break;
default:
DEBUG(0, ("unknown tag type %d\n", (unsigned int)tag));
return False;
}
switch(ace->a_type) {
case SMB_ACL_USER: {
uid_t *puid = (uid_t *)acl_get_qualifier(posix_ace);
if (puid == NULL) {
DEBUG(0, ("smb_acl_get_qualifier failed\n"));
return False;
}
ace->uid = *puid;
acl_free(puid);
break;
}
case SMB_ACL_GROUP: {
gid_t *pgid = (uid_t *)acl_get_qualifier(posix_ace);
if (pgid == NULL) {
DEBUG(0, ("smb_acl_get_qualifier failed\n"));
return False;
}
ace->gid = *pgid;
acl_free(pgid);
break;
}
default:
break;
}
if (acl_get_permset(posix_ace, &permset) != 0) {
DEBUG(0, ("smb_acl_get_mode failed\n"));
return False;
}
ace->a_perm = 0;
#ifdef HAVE_ACL_GET_PERM_NP
ace->a_perm |= (acl_get_perm_np(permset, ACL_READ) ? SMB_ACL_READ : 0);
ace->a_perm |= (acl_get_perm_np(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
ace->a_perm |= (acl_get_perm_np(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
#else
ace->a_perm |= (acl_get_perm(permset, ACL_READ) ? SMB_ACL_READ : 0);
ace->a_perm |= (acl_get_perm(permset, ACL_WRITE) ? SMB_ACL_WRITE : 0);
ace->a_perm |= (acl_get_perm(permset, ACL_EXECUTE) ? SMB_ACL_EXECUTE : 0);
#endif
return True;
}
static struct smb_acl_t *smb_acl_to_internal(acl_t acl)
{
struct smb_acl_t *result = SMB_MALLOC_P(struct smb_acl_t);
int entry_id = ACL_FIRST_ENTRY;
acl_entry_t e;
if (result == NULL) {
return NULL;
}
ZERO_STRUCTP(result);
while (acl_get_entry(acl, entry_id, &e) == 1) {
entry_id = ACL_NEXT_ENTRY;
result = (struct smb_acl_t *)SMB_REALLOC(
result, sizeof(struct smb_acl_t) +
(sizeof(struct smb_acl_entry) * (result->count+1)));
if (result == NULL) {
DEBUG(0, ("SMB_REALLOC failed\n"));
errno = ENOMEM;
return NULL;
}
if (!smb_ace_to_internal(e, &result->acl[result->count])) {
SAFE_FREE(result);
return NULL;
}
result->count += 1;
}
return result;
}
static int smb_acl_set_mode(acl_entry_t entry, SMB_ACL_PERM_T perm)
{
int ret;
acl_permset_t permset;
if ((ret = acl_get_permset(entry, &permset)) != 0) {
return ret;
}
if ((ret = acl_clear_perms(permset)) != 0) {
return ret;
}
if ((perm & SMB_ACL_READ) &&
((ret = acl_add_perm(permset, ACL_READ)) != 0)) {
return ret;
}
if ((perm & SMB_ACL_WRITE) &&
((ret = acl_add_perm(permset, ACL_WRITE)) != 0)) {
return ret;
}
if ((perm & SMB_ACL_EXECUTE) &&
((ret = acl_add_perm(permset, ACL_EXECUTE)) != 0)) {
return ret;
}
return acl_set_permset(entry, permset);
}
static acl_t smb_acl_to_posix(const struct smb_acl_t *acl)
{
acl_t result;
int i;
result = acl_init(acl->count);
if (result == NULL) {
DEBUG(10, ("acl_init failed\n"));
return NULL;
}
for (i=0; i<acl->count; i++) {
const struct smb_acl_entry *entry = &acl->acl[i];
acl_entry_t e;
acl_tag_t tag;
if (acl_create_entry(&result, &e) != 0) {
DEBUG(1, ("acl_create_entry failed: %s\n",
strerror(errno)));
goto fail;
}
switch (entry->a_type) {
case SMB_ACL_USER:
tag = ACL_USER;
break;
case SMB_ACL_USER_OBJ:
tag = ACL_USER_OBJ;
break;
case SMB_ACL_GROUP:
tag = ACL_GROUP;
break;
case SMB_ACL_GROUP_OBJ:
tag = ACL_GROUP_OBJ;
break;
case SMB_ACL_OTHER:
tag = ACL_OTHER;
break;
case SMB_ACL_MASK:
tag = ACL_MASK;
break;
default:
DEBUG(1, ("Unknown tag value %d\n", entry->a_type));
goto fail;
}
if (acl_set_tag_type(e, tag) != 0) {
DEBUG(10, ("acl_set_tag_type(%d) failed: %s\n",
tag, strerror(errno)));
goto fail;
}
switch (entry->a_type) {
case SMB_ACL_USER:
if (acl_set_qualifier(e, &entry->uid) != 0) {
DEBUG(1, ("acl_set_qualifiier failed: %s\n",
strerror(errno)));
goto fail;
}
break;
case SMB_ACL_GROUP:
if (acl_set_qualifier(e, &entry->gid) != 0) {
DEBUG(1, ("acl_set_qualifiier failed: %s\n",
strerror(errno)));
goto fail;
}
break;
default: /* Shut up, compiler! :-) */
break;
}
if (smb_acl_set_mode(e, entry->a_perm) != 0) {
goto fail;
}
}
if (acl_valid(result) != 0) {
char *acl_string = sys_acl_to_text(acl, NULL);
DEBUG(0, ("smb_acl_to_posix: ACL %s is invalid for set (%s)\n",
acl_string, strerror(errno)));
SAFE_FREE(acl_string);
goto fail;
}
return result;
fail:
if (result != NULL) {
acl_free(result);
}
return NULL;
}
/* VFS operations structure */
static struct vfs_fn_pointers posixacl_fns = {
.sys_acl_get_file_fn = posixacl_sys_acl_get_file,
.sys_acl_get_fd_fn = posixacl_sys_acl_get_fd,
.sys_acl_set_file_fn = posixacl_sys_acl_set_file,
.sys_acl_set_fd_fn = posixacl_sys_acl_set_fd,
.sys_acl_delete_def_file_fn = posixacl_sys_acl_delete_def_file,
};
NTSTATUS vfs_posixacl_init(void);
NTSTATUS vfs_posixacl_init(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posixacl",
&posixacl_fns);
}