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/*
Unix SMB/CIFS implementation.
POSIX NTVFS backend - NT ACLs mapped to NFS4 ACLs, as per
http://www.suse.de/~agruen/nfs4acl/
Copyright (C) Andrew Tridgell 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 "vfs_posix.h"
#include "../lib/util/unix_privs.h"
#include "librpc/gen_ndr/ndr_nfs4acl.h"
#include "libcli/security/security.h"
#define ACE4_IDENTIFIER_GROUP 0x40
/*
load the current ACL from system.nfs4acl
*/
static NTSTATUS pvfs_acl_load_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
TALLOC_CTX *mem_ctx,
struct security_descriptor **psd)
{
NTSTATUS status;
struct nfs4acl *acl;
struct security_descriptor *sd;
int i, num_ids;
struct id_map *ids;
struct composite_context *ctx;
acl = talloc_zero(mem_ctx, struct nfs4acl);
NT_STATUS_HAVE_NO_MEMORY(acl);
status = pvfs_xattr_ndr_load(pvfs, mem_ctx, name->full_name, fd,
NFS4ACL_XATTR_NAME,
acl, (void *) ndr_pull_nfs4acl);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(acl);
return status;
}
*psd = security_descriptor_initialise(mem_ctx);
NT_STATUS_HAVE_NO_MEMORY(*psd);
sd = *psd;
sd->type |= acl->a_flags;
/* the number of ids to map is the acl count plus uid and gid */
num_ids = acl->a_count +2;
ids = talloc_array(sd, struct id_map, num_ids);
NT_STATUS_HAVE_NO_MEMORY(ids);
ids[0].xid.id = name->st.st_uid;
ids[0].xid.type = ID_TYPE_UID;
ids[0].sid = NULL;
ids[0].status = ID_UNKNOWN;
ids[1].xid.id = name->st.st_gid;
ids[1].xid.type = ID_TYPE_GID;
ids[1].sid = NULL;
ids[1].status = ID_UNKNOWN;
for (i=0;i<acl->a_count;i++) {
struct nfs4ace *a = &acl->ace[i];
ids[i+2].xid.id = a->e_id;
if (a->e_flags & ACE4_IDENTIFIER_GROUP) {
ids[i+2].xid.type = ID_TYPE_GID;
} else {
ids[i+2].xid.type = ID_TYPE_UID;
}
ids[i+2].sid = NULL;
ids[i+2].status = ID_UNKNOWN;
}
/* Allocate memory for the sids from the security descriptor to be on
* the safe side. */
ctx = wbc_xids_to_sids_send(pvfs->wbc_ctx, sd, num_ids, ids);
NT_STATUS_HAVE_NO_MEMORY(ctx);
status = wbc_xids_to_sids_recv(ctx, &ids);
NT_STATUS_NOT_OK_RETURN(status);
sd->owner_sid = talloc_steal(sd, ids[0].sid);
sd->group_sid = talloc_steal(sd, ids[1].sid);
for (i=0;i<acl->a_count;i++) {
struct nfs4ace *a = &acl->ace[i];
struct security_ace ace;
ace.type = a->e_type;
ace.flags = a->e_flags;
ace.access_mask = a->e_mask;
ace.trustee = *ids[i+2].sid;
security_descriptor_dacl_add(sd, &ace);
}
return NT_STATUS_OK;
}
/*
save the acl for a file into system.nfs4acl
*/
static NTSTATUS pvfs_acl_save_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
struct security_descriptor *sd)
{
NTSTATUS status;
void *privs;
struct nfs4acl acl;
int i;
TALLOC_CTX *tmp_ctx;
struct id_map *ids;
struct composite_context *ctx;
tmp_ctx = talloc_new(pvfs);
NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
acl.a_version = 0;
acl.a_flags = sd->type;
acl.a_count = sd->dacl?sd->dacl->num_aces:0;
acl.a_owner_mask = 0;
acl.a_group_mask = 0;
acl.a_other_mask = 0;
acl.ace = talloc_array(tmp_ctx, struct nfs4ace, acl.a_count);
if (!acl.ace) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
ids = talloc_array(tmp_ctx, struct id_map, acl.a_count);
if (ids == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
for (i=0;i<acl.a_count;i++) {
struct security_ace *ace = &sd->dacl->aces[i];
ZERO_STRUCT(ids[i].xid);
ids[i].sid = dom_sid_dup(ids, &ace->trustee);
if (ids[i].sid == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
ids[i].status = ID_UNKNOWN;
}
ctx = wbc_sids_to_xids_send(pvfs->wbc_ctx,ids, acl.a_count, ids);
if (ctx == NULL) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
status = wbc_sids_to_xids_recv(ctx, &ids);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
return status;
}
for (i=0;i<acl.a_count;i++) {
struct nfs4ace *a = &acl.ace[i];
struct security_ace *ace = &sd->dacl->aces[i];
a->e_type = ace->type;
a->e_flags = ace->flags;
a->e_mask = ace->access_mask;
if (ids[i].xid.type != ID_TYPE_UID) {
a->e_flags |= ACE4_IDENTIFIER_GROUP;
}
a->e_id = ids[i].xid.id;
a->e_who = "";
}
privs = root_privileges();
status = pvfs_xattr_ndr_save(pvfs, name->full_name, fd,
NFS4ACL_XATTR_NAME,
&acl, (void *) ndr_push_nfs4acl);
talloc_free(privs);
talloc_free(tmp_ctx);
return status;
}
/*
initialise pvfs acl NFS4 backend
*/
NTSTATUS pvfs_acl_nfs4_init(void)
{
struct pvfs_acl_ops ops = {
.name = "nfs4acl",
.acl_load = pvfs_acl_load_nfs4,
.acl_save = pvfs_acl_save_nfs4
};
return pvfs_acl_register(&ops);
}
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