/*

   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 {

    /*

     * Normal ACEs have a coda.ignored blob that is always or

     * almost always empty. We aren't going to push it (it is

     * ignored), so we don't add that length to the size.

     */

  }

  /* 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;

}

static inline enum ndr_err_code ndr_maybe_pull_security_ace_object_ctr(struct ndr_pull *ndr,

                       ndr_flags_type ndr_flags,

                       struct security_ace *r)

{

  /*

   * If this is not an object ACE (as is usually common),

   * ndr_pull_security_ace_object_ctr() will do nothing.

   *

   * By avoiding calling the function in that case, we avoid some

   * tallocing and ndr token busywork.

   */

  bool is_object = sec_ace_object(r->type);

  if (is_object) {

    NDR_CHECK(ndr_pull_set_switch_value(ndr, &r->object, is_object));

    NDR_CHECK(ndr_pull_security_ace_object_ctr(ndr, ndr_flags, &r->object));

  }

  return NDR_ERR_SUCCESS;

}

_PUBLIC_ enum ndr_err_code ndr_pull_security_ace(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct security_ace *r)

{

  NDR_PULL_CHECK_FLAGS(ndr, ndr_flags);

  if (ndr_flags & NDR_SCALARS) {

    ssize_t sub_size;

    NDR_CHECK(ndr_pull_align(ndr, 5));

    NDR_CHECK(ndr_pull_security_ace_type(ndr, NDR_SCALARS, &r->type));

    NDR_CHECK(ndr_pull_security_ace_flags(ndr, NDR_SCALARS, &r->flags));

    NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &r->size));

    NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->access_mask));

    NDR_CHECK(ndr_maybe_pull_security_ace_object_ctr(ndr, NDR_SCALARS, r));

    NDR_CHECK(ndr_pull_dom_sid(ndr, NDR_SCALARS, &r->trustee));

    sub_size = ndr_subcontext_size_of_ace_coda(r, r->size, ndr->flags);

    if (sub_size == 0 && !sec_ace_has_extra_blob(r->type)) {

      r->coda.ignored.data = NULL;

      r->coda.ignored.length = 0;

    } else {

      struct ndr_pull *_ndr_coda;

      NDR_CHECK(ndr_pull_subcontext_start(ndr, &_ndr_coda, 0, sub_size));

      NDR_CHECK(ndr_pull_set_switch_value(_ndr_coda, &r->coda, r->type));

      NDR_CHECK(ndr_pull_security_ace_coda(_ndr_coda, NDR_SCALARS|NDR_BUFFERS, &r->coda));

      NDR_CHECK(ndr_pull_subcontext_end(ndr, _ndr_coda, 0, sub_size));

    }

    NDR_CHECK(ndr_pull_trailer_align(ndr, 5));

  }

  if (ndr_flags & NDR_BUFFERS) {

    NDR_CHECK(ndr_maybe_pull_security_ace_object_ctr(ndr, NDR_BUFFERS, r));

  }

  return NDR_ERR_SUCCESS;

}

static inline enum ndr_err_code ndr_maybe_push_security_ace_object_ctr(struct ndr_push *ndr,

                       ndr_flags_type ndr_flags,

                       const struct security_ace *r)

{

  /*

   * ndr_push_security_ace_object_ctr() does nothing (except tallocing

   * and ndr_token fiddling) unless the ACE is an object ACE, which is

   * usually very unlikely.

   */

  bool is_object = sec_ace_object(r->type);

  if (is_object) {

    NDR_CHECK(ndr_push_set_switch_value(ndr, &r->object, is_object));

    NDR_CHECK(ndr_push_security_ace_object_ctr(ndr, ndr_flags, &r->object));

  }

  return NDR_ERR_SUCCESS;

}

_PUBLIC_ enum ndr_err_code ndr_push_security_ace(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct security_ace *r)

{

  NDR_PUSH_CHECK_FLAGS(ndr, ndr_flags);

  if (ndr_flags & NDR_SCALARS) {

    NDR_CHECK(ndr_push_align(ndr, 5));

    NDR_CHECK(ndr_push_security_ace_type(ndr, NDR_SCALARS, r->type));

    NDR_CHECK(ndr_push_security_ace_flags(ndr, NDR_SCALARS, r->flags));

    NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, ndr_size_security_ace(r, ndr->flags)));

    NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->access_mask));

    NDR_CHECK(ndr_maybe_push_security_ace_object_ctr(ndr, NDR_SCALARS, r));

    NDR_CHECK(ndr_push_dom_sid(ndr, NDR_SCALARS, &r->trustee));

    if (sec_ace_has_extra_blob(r->type)) {

      struct ndr_push *_ndr_coda;

      size_t coda_size = ndr_subcontext_size_of_ace_coda(

        r,

        ndr_size_security_ace(r, ndr->flags),

        ndr->flags);

      NDR_CHECK(ndr_push_subcontext_start(ndr, &_ndr_coda, 0, coda_size));

      NDR_CHECK(ndr_push_set_switch_value(_ndr_coda, &r->coda, r->type));

      NDR_CHECK(ndr_push_security_ace_coda(_ndr_coda, NDR_SCALARS|NDR_BUFFERS, &r->coda));

      NDR_CHECK(ndr_push_subcontext_end(ndr, _ndr_coda, 0, coda_size));

    }

    NDR_CHECK(ndr_push_trailer_align(ndr, 5));

  }

  if (ndr_flags & NDR_BUFFERS) {

    NDR_CHECK(ndr_maybe_push_security_ace_object_ctr(ndr, NDR_BUFFERS, r));

  }

  return NDR_ERR_SUCCESS;

}

/*

 * 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;

  uint32_t 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;

}