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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;
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, 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;
status = sidmap_uid_to_sid(pvfs->sidmap, sd, name->st.st_uid, &sd->owner_sid);
NT_STATUS_NOT_OK_RETURN(status);
status = sidmap_gid_to_sid(pvfs->sidmap, sd, name->st.st_gid, &sd->group_sid);
NT_STATUS_NOT_OK_RETURN(status);
for (i=0;i<acl->a_count;i++) {
struct nfs4ace *a = &acl->ace[i];
struct security_ace ace;
struct dom_sid *sid;
ace.type = a->e_type;
ace.flags = a->e_flags;
ace.access_mask = a->e_mask;
if (a->e_flags & ACE4_IDENTIFIER_GROUP) {
status = sidmap_gid_to_sid(pvfs->sidmap, sd, a->e_id, &sid);
} else {
status = sidmap_uid_to_sid(pvfs->sidmap, sd, a->e_id, &sid);
}
NT_STATUS_NOT_OK_RETURN(status);
ace.trustee = *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;
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;
}
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 (sidmap_sid_is_group(pvfs->sidmap, &ace->trustee)) {
gid_t gid;
a->e_flags |= ACE4_IDENTIFIER_GROUP;
status = sidmap_sid_to_unixgid(pvfs->sidmap, &ace->trustee, &gid);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
return status;
}
a->e_id = gid;
} else {
uid_t uid;
status = sidmap_sid_to_unixuid(pvfs->sidmap, &ace->trustee, &uid);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
return status;
}
a->e_id = uid;
}
a->e_who = "";
}
privs = root_privileges();
status = pvfs_xattr_ndr_save(pvfs, name->full_name, fd,
NFS4ACL_XATTR_NAME,
&acl, 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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