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samba-mirror/librpc/ndr/ndr_sec_helper.c
Joseph Sutton a396b705c8 librpc:ndr: Introduce ‘ndr_flags_type’ type
Instead of ‘int’ or ‘uint32_t’, neither of which convey much meaning,
consistently use a newly added type to hold NDR_ flags.

Update the NDR 4.0.0 ABI.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-11-01 20:10:45 +00:00

354 lines
9.8 KiB
C

/*
Unix SMB/CIFS implementation.
fast routines for getting the wire size of security objects
Copyright (C) Andrew Tridgell 2003
Copyright (C) Stefan Metzmacher 2006-2008
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"
/*
* Find the wire size of a security_ace that has no trailing coda.
* This is used in ndr_pull_security_ace() generated from security.idl
* to work out where the coda starts (and in ndr_size_security_ace()
* just below).
*/
static size_t ndr_size_security_ace_core(const struct security_ace *ace, libndr_flags flags)
{
size_t ret;
if (!ace) return 0;
ret = 8 + ndr_size_dom_sid(&ace->trustee, flags);
if (sec_ace_object(ace->type)) {
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_type.inherited_type */
}
}
return ret;
}
/*
return the wire size of a security_ace
*/
size_t ndr_size_security_ace(const struct security_ace *ace, libndr_flags flags)
{
size_t base = ndr_size_security_ace_core(ace, flags);
size_t ret = base;
if (sec_ace_callback(ace->type)) {
ret += ace->coda.conditions.length;
} else if (ace->type == SEC_ACE_TYPE_SYSTEM_RESOURCE_ATTRIBUTE) {
ret += ndr_size_security_ace_coda(&ace->coda, ace->type, flags);
} else {
ret += ace->coda.ignored.length;
}
/* round up to a multiple of 4 (MS-DTYP 2.4.4.1) */
ret = (ret + 3ULL) & ~3ULL;
if (unlikely(ret < base)) {
/* overflow, and there's not much we can do anyway */
return 0;
}
return ret;
}
/*
* An ACE coda can't be bigger than the space allowed for by
* ace->size, so we need to check this from the context of the ACE.
*
* Usually the coda also can't be any smaller than the remaining
* space, because it is defined as a blob consuming everything it can.
*
* This is only used to find the size for the coda subcontext in
* security.idl.
*/
size_t ndr_subcontext_size_of_ace_coda(const struct security_ace *ace,
size_t ace_size,
libndr_flags flags)
{
size_t core_size;
if (ace_size == 0) {
return 0;
}
core_size = ndr_size_security_ace_core(ace, flags);
if (ace_size < core_size) {
return 0;
}
return ace_size - core_size;
}
/*
return the wire size of a security_acl
*/
size_t ndr_size_security_acl(const struct security_acl *theacl, libndr_flags flags)
{
size_t ret;
int i;
if (!theacl) return 0;
ret = 8;
for (i=0;i<theacl->num_aces;i++) {
ret += ndr_size_security_ace(&theacl->aces[i], flags);
}
return ret;
}
/*
return the wire size of a security descriptor
*/
size_t ndr_size_security_descriptor(const struct security_descriptor *sd, libndr_flags 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;
}
/*
return the wire size of a dom_sid
*/
size_t ndr_size_dom_sid(const struct dom_sid *sid, libndr_flags flags)
{
if (!sid) return 0;
return 8 + 4*sid->num_auths;
}
size_t ndr_size_dom_sid28(const struct dom_sid *sid, libndr_flags flags)
{
if (all_zero((const uint8_t *)sid, sizeof(struct dom_sid))) {
return 0;
}
return ndr_size_dom_sid(sid, flags);
}
size_t ndr_size_dom_sid0(const struct dom_sid *sid, libndr_flags flags)
{
return ndr_size_dom_sid28(sid, flags);
}
/*
print a dom_sid
*/
void ndr_print_dom_sid(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
{
struct dom_sid_buf buf;
ndr->print(ndr, "%-25s: %s", name, dom_sid_str_buf(sid, &buf));
}
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);
}
void ndr_print_dom_sid0(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, ndr_flags_type ndr_flags, struct dom_sid *sid)
{
uint32_t num_auths;
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
NDR_CHECK(ndr_pull_uint3264(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 num_auths %"PRIu32"; should equal %"PRId8,
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, ndr_flags_type ndr_flags, const struct dom_sid *sid)
{
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
NDR_CHECK(ndr_push_uint3264(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 up to 5 sub_auth
*/
enum ndr_err_code ndr_pull_dom_sid28(struct ndr_pull *ndr, ndr_flags_type 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;
status = ndr_pull_advance(ndr, 28);
if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
talloc_free(subndr);
return status;
}
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) {
ZERO_STRUCT(sid->sub_auths);
}
talloc_free(subndr);
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, ndr_flags_type 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 up to 5 sub auths [%"PRId8"]",
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;
}
/*
parse a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty
*/
enum ndr_err_code ndr_pull_dom_sid0(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *sid)
{
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
if (ndr->data_size == ndr->offset) {
ZERO_STRUCTP(sid);
return NDR_ERR_SUCCESS;
}
return ndr_pull_dom_sid(ndr, ndr_flags, sid);
}
/*
push a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty
*/
enum ndr_err_code ndr_push_dom_sid0(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *sid)
{
if (!(ndr_flags & NDR_SCALARS)) {
return NDR_ERR_SUCCESS;
}
if (!sid) {
return NDR_ERR_SUCCESS;
}
if (all_zero((const uint8_t *)sid, sizeof(struct dom_sid))) {
return NDR_ERR_SUCCESS;
}
return ndr_push_dom_sid(ndr, ndr_flags, sid);
}
_PUBLIC_ enum ndr_err_code ndr_push_dom_sid(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *r)
{
uint32_t cntr_sub_auths_0;
if (ndr_flags & NDR_SCALARS) {
NDR_CHECK(ndr_push_align(ndr, 4));
NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, r->sid_rev_num));
NDR_CHECK(ndr_push_int8(ndr, NDR_SCALARS, r->num_auths));
NDR_CHECK(ndr_push_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6));
if (r->num_auths < 0 || r->num_auths > ARRAY_SIZE(r->sub_auths)) {
return ndr_push_error(ndr, NDR_ERR_RANGE, "value (%"PRId8") out of range (0 - %zu)", r->num_auths, ARRAY_SIZE(r->sub_auths));
}
for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) {
NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->sub_auths[cntr_sub_auths_0]));
}
}
return NDR_ERR_SUCCESS;
}
_PUBLIC_ enum ndr_err_code ndr_pull_dom_sid(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *r)
{
uint32_t cntr_sub_auths_0;
if (ndr_flags & NDR_SCALARS) {
NDR_CHECK(ndr_pull_align(ndr, 4));
NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &r->sid_rev_num));
NDR_CHECK(ndr_pull_int8(ndr, NDR_SCALARS, &r->num_auths));
if (r->num_auths < 0 || r->num_auths > ARRAY_SIZE(r->sub_auths)) {
return ndr_pull_error(ndr, NDR_ERR_RANGE, "value (%"PRId8") out of range (0 - %zu)", r->num_auths, ARRAY_SIZE(r->sub_auths));
}
NDR_CHECK(ndr_pull_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6));
ZERO_STRUCT(r->sub_auths);
for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) {
NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->sub_auths[cntr_sub_auths_0]));
}
}
return NDR_ERR_SUCCESS;
}