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/*
Unix SMB/CIFS implementation.
fast routines for getting the wire size of security objects
Copyright (C) Andrew Tridgell 2003
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 "librpc/gen_ndr/ndr_security.h"
#include "libcli/security/security.h"
/*
return the wire size of a dom_sid
*/
size_t ndr_size_dom_sid(const struct dom_sid *sid, int flags)
{
if (!sid) return 0;
return 8 + 4*sid->num_auths;
}
size_t ndr_size_dom_sid28(const struct dom_sid *sid, int flags)
{
struct dom_sid zero_sid;
if (!sid) return 0;
ZERO_STRUCT(zero_sid);
if (memcmp(&zero_sid, sid, sizeof(zero_sid)) == 0) {
return 0;
}
return 8 + 4*sid->num_auths;
}
/*
return the wire size of a security_ace
*/
size_t ndr_size_security_ace(const struct security_ace *ace, int flags)
{
size_t ret;
if (!ace) return 0;
ret = 8 + ndr_size_dom_sid(&ace->trustee, flags);
switch (ace->type) {
case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
case SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT:
case SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT:
ret += 4; /* uint32 bitmap ace->object.object.flags */
if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) {
ret += 16; /* GUID ace->object.object.type.type */
}
if (ace->object.object.flags & SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) {
ret += 16; /* GUID ace->object.object.inherited_typeinherited_type */
}
break;
default:
break;
}
return ret;
}
/*
return the wire size of a security_acl
*/
size_t ndr_size_security_acl(const struct security_acl *acl, int flags)
{
size_t ret;
int i;
if (!acl) return 0;
ret = 8;
for (i=0;i<acl->num_aces;i++) {
ret += ndr_size_security_ace(&acl->aces[i], flags);
}
return ret;
}
/*
return the wire size of a security descriptor
*/
size_t ndr_size_security_descriptor(const struct security_descriptor *sd, int flags)
{
size_t ret;
if (!sd) return 0;
ret = 20;
ret += ndr_size_dom_sid(sd->owner_sid, flags);
ret += ndr_size_dom_sid(sd->group_sid, flags);
ret += ndr_size_security_acl(sd->dacl, flags);
ret += ndr_size_security_acl(sd->sacl, flags);
return ret;
}
/*
print a dom_sid
*/
void ndr_print_dom_sid(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
{
ndr->print(ndr, "%-25s: %s", name, dom_sid_string(ndr, sid));
}
void ndr_print_dom_sid2(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
{
ndr_print_dom_sid(ndr, name, sid);
}
void ndr_print_dom_sid28(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
{
ndr_print_dom_sid(ndr, name, sid);
}
/*
parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
*/
enum ndr_err_code ndr_pull_dom_sid2(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
{
uint32_t num_auths;
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &num_auths));
NDR_CHECK(ndr_pull_dom_sid(ndr, ndr_flags, sid));
if (sid->num_auths != num_auths) {
return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
"Bad array size %u should exceed %u",
num_auths, sid->num_auths);
}
return NDR_ERR_SUCCESS;
}
/*
parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
*/
enum ndr_err_code ndr_push_dom_sid2(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
{
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, sid->num_auths));
return ndr_push_dom_sid(ndr, ndr_flags, sid);
}
/*
parse a dom_sid28 - this is a dom_sid in a fixed 28 byte buffer, so we need to ensure there are only upto 5 sub_auth
*/
enum ndr_err_code ndr_pull_dom_sid28(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
{
enum ndr_err_code status;
struct ndr_pull *subndr;
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
subndr = talloc_zero(ndr, struct ndr_pull);
NDR_ERR_HAVE_NO_MEMORY(subndr);
subndr->flags = ndr->flags;
subndr->current_mem_ctx = ndr->current_mem_ctx;
subndr->data = ndr->data + ndr->offset;
subndr->data_size = 28;
subndr->offset = 0;
NDR_CHECK(ndr_pull_advance(ndr, 28));
status = ndr_pull_dom_sid(subndr, ndr_flags, sid);
if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
/* handle a w2k bug which send random data in the buffer */
ZERO_STRUCTP(sid);
} else if (sid->num_auths == 0 && sid->sub_auths) {
talloc_free(sid->sub_auths);
sid->sub_auths = NULL;
}
return NDR_ERR_SUCCESS;
}
/*
push a dom_sid28 - this is a dom_sid in a 28 byte fixed buffer
*/
enum ndr_err_code ndr_push_dom_sid28(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
{
uint32_t old_offset;
uint32_t padding;
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
if (sid->num_auths > 5) {
return ndr_push_error(ndr, NDR_ERR_RANGE,
"dom_sid28 allows only upto 5 sub auth [%u]",
sid->num_auths);
}
old_offset = ndr->offset;
NDR_CHECK(ndr_push_dom_sid(ndr, ndr_flags, sid));
padding = 28 - (ndr->offset - old_offset);
if (padding > 0) {
NDR_CHECK(ndr_push_zero(ndr, padding));
}
return NDR_ERR_SUCCESS;
}
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