librpc/ndr/ndr_sec_helper.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    fast routines for getting the wire size of security objects
   5
   6    Copyright (C) Andrew Tridgell 2003
   7    Copyright (C) Stefan Metzmacher 2006-2008
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23
  24 #include "includes.h"
  25 #include "librpc/gen_ndr/ndr_security.h"
  26 #include "../libcli/security/security.h"
  27
  28 /*
  29   return the wire size of a security_ace
  30 */
  31 size_t ndr_size_security_ace(const struct security_ace *ace, int flags)
  32 {
  33         size_t ret;
  34
  35         if (!ace) return 0;
  36
  37         ret = 8 + ndr_size_dom_sid(&ace->trustee, flags);
  38
  39         switch (ace->type) {
  40         case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
  41         case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
  42         case SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT:
  43         case SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT:
  44                 ret += 4; /* uint32 bitmap ace->object.object.flags */
  45                 if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) {
  46                         ret += 16; /* GUID ace->object.object.type.type */
  47                 }
  48                 if (ace->object.object.flags & SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) {
  49                         ret += 16; /* GUID ace->object.object.inherited_typeinherited_type */
  50                 }
  51                 break;
  52         default:
  53                 break;
  54         }
  55
  56         return ret;
  57 }
  58
  59 enum ndr_err_code ndr_pull_security_ace(struct ndr_pull *ndr, int ndr_flags, struct security_ace *r)
  60 {
  61         if (ndr_flags & NDR_SCALARS) {
  62                 uint32_t start_ofs = ndr->offset;
  63                 uint32_t size = 0;
  64                 uint32_t pad = 0;
  65                 NDR_CHECK(ndr_pull_align(ndr, 4));
  66                 NDR_CHECK(ndr_pull_security_ace_type(ndr, NDR_SCALARS, &r->type));
  67                 NDR_CHECK(ndr_pull_security_ace_flags(ndr, NDR_SCALARS, &r->flags));
  68                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &r->size));
  69                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->access_mask));
  70                 NDR_CHECK(ndr_pull_set_switch_value(ndr, &r->object, r->type));
  71                 NDR_CHECK(ndr_pull_security_ace_object_ctr(ndr, NDR_SCALARS, &r->object));
  72                 NDR_CHECK(ndr_pull_dom_sid(ndr, NDR_SCALARS, &r->trustee));
  73                 size = ndr->offset - start_ofs;
  74                 if (r->size < size) {
  75                         return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
  76                                               "ndr_pull_security_ace: r->size %u < size %u",
  77                                               (unsigned)r->size, size);
  78                 }
  79                 pad = r->size - size;
  80                 NDR_PULL_NEED_BYTES(ndr, pad);
  81                 ndr->offset += pad;
  82         }
  83         if (ndr_flags & NDR_BUFFERS) {
  84                 NDR_CHECK(ndr_pull_security_ace_object_ctr(ndr, NDR_BUFFERS, &r->object));
  85         }
  86         return NDR_ERR_SUCCESS;
  87 }
  88
  89 /*
  90   return the wire size of a security_acl
  91 */
  92 size_t ndr_size_security_acl(const struct security_acl *theacl, int flags)
  93 {
  94         size_t ret;
  95         int i;
  96         if (!theacl) return 0;
  97         ret = 8;
  98         for (i=0;i<theacl->num_aces;i++) {
  99                 ret += ndr_size_security_ace(&theacl->aces[i], flags);
 100         }
 101         return ret;
 102 }
 103
 104 /*
 105   return the wire size of a security descriptor
 106 */
 107 size_t ndr_size_security_descriptor(const struct security_descriptor *sd, int flags)
 108 {
 109         size_t ret;
 110         if (!sd) return 0;
 111
 112         ret = 20;
 113         ret += ndr_size_dom_sid(sd->owner_sid, flags);
 114         ret += ndr_size_dom_sid(sd->group_sid, flags);
 115         ret += ndr_size_security_acl(sd->dacl, flags);
 116         ret += ndr_size_security_acl(sd->sacl, flags);
 117         return ret;
 118 }
 119
 120 /*
 121   return the wire size of a dom_sid
 122 */
 123 size_t ndr_size_dom_sid(const struct dom_sid *sid, int flags)
 124 {
 125         if (!sid) return 0;
 126         return 8 + 4*sid->num_auths;
 127 }
 128
 129 size_t ndr_size_dom_sid28(const struct dom_sid *sid, int flags)
 130 {
 131         struct dom_sid zero_sid;
 132
 133         if (!sid) return 0;
 134
 135         ZERO_STRUCT(zero_sid);
 136
 137         if (memcmp(&zero_sid, sid, sizeof(zero_sid)) == 0) {
 138                 return 0;
 139         }
 140
 141         return 8 + 4*sid->num_auths;
 142 }
 143
 144 size_t ndr_size_dom_sid0(const struct dom_sid *sid, int flags)
 145 {
 146         return ndr_size_dom_sid28(sid, flags);
 147 }
 148
 149 /*
 150   print a dom_sid
 151 */
 152 void ndr_print_dom_sid(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
 153 {
 154         ndr->print(ndr, "%-25s: %s", name, dom_sid_string(ndr, sid));
 155 }
 156
 157 void ndr_print_dom_sid2(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
 158 {
 159         ndr_print_dom_sid(ndr, name, sid);
 160 }
 161
 162 void ndr_print_dom_sid28(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
 163 {
 164         ndr_print_dom_sid(ndr, name, sid);
 165 }
 166
 167 void ndr_print_dom_sid0(struct ndr_print *ndr, const char *name, const struct dom_sid *sid)
 168 {
 169         ndr_print_dom_sid(ndr, name, sid);
 170 }
 171
 172
 173 /*
 174   parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
 175 */
 176 enum ndr_err_code ndr_pull_dom_sid2(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
 177 {
 178         uint32_t num_auths;
 179         if (!(ndr_flags & NDR_SCALARS)) {
 180                 return NDR_ERR_SUCCESS;
 181         }
 182         NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &num_auths));
 183         NDR_CHECK(ndr_pull_dom_sid(ndr, ndr_flags, sid));
 184         if (sid->num_auths != num_auths) {
 185                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 186                                       "Bad array size %u should exceed %u",
 187                                       num_auths, sid->num_auths);
 188         }
 189         return NDR_ERR_SUCCESS;
 190 }
 191
 192 /*
 193   parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field
 194 */
 195 enum ndr_err_code ndr_push_dom_sid2(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
 196 {
 197         if (!(ndr_flags & NDR_SCALARS)) {
 198                 return NDR_ERR_SUCCESS;
 199         }
 200         NDR_CHECK(ndr_push_uint3264(ndr, NDR_SCALARS, sid->num_auths));
 201         return ndr_push_dom_sid(ndr, ndr_flags, sid);
 202 }
 203
 204 /*
 205   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
 206 */
 207 enum ndr_err_code ndr_pull_dom_sid28(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
 208 {
 209         enum ndr_err_code status;
 210         struct ndr_pull *subndr;
 211
 212         if (!(ndr_flags & NDR_SCALARS)) {
 213                 return NDR_ERR_SUCCESS;
 214         }
 215
 216         subndr = talloc_zero(ndr, struct ndr_pull);
 217         NDR_ERR_HAVE_NO_MEMORY(subndr);
 218         subndr->flags           = ndr->flags;
 219         subndr->current_mem_ctx = ndr->current_mem_ctx;
 220
 221         subndr->data            = ndr->data + ndr->offset;
 222         subndr->data_size       = 28;
 223         subndr->offset          = 0;
 224
 225         NDR_CHECK(ndr_pull_advance(ndr, 28));
 226
 227         status = ndr_pull_dom_sid(subndr, ndr_flags, sid);
 228         if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
 229                 /* handle a w2k bug which send random data in the buffer */
 230                 ZERO_STRUCTP(sid);
 231         } else if (sid->num_auths == 0) {
 232                 ZERO_STRUCT(sid->sub_auths);
 233         }
 234
 235         return NDR_ERR_SUCCESS;
 236 }
 237
 238 /*
 239   push a dom_sid28 - this is a dom_sid in a 28 byte fixed buffer
 240 */
 241 enum ndr_err_code ndr_push_dom_sid28(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
 242 {
 243         uint32_t old_offset;
 244         uint32_t padding;
 245
 246         if (!(ndr_flags & NDR_SCALARS)) {
 247                 return NDR_ERR_SUCCESS;
 248         }
 249
 250         if (sid->num_auths > 5) {
 251                 return ndr_push_error(ndr, NDR_ERR_RANGE,
 252                                       "dom_sid28 allows only upto 5 sub auth [%u]",
 253                                       sid->num_auths);
 254         }
 255
 256         old_offset = ndr->offset;
 257         NDR_CHECK(ndr_push_dom_sid(ndr, ndr_flags, sid));
 258
 259         padding = 28 - (ndr->offset - old_offset);
 260
 261         if (padding > 0) {
 262                 NDR_CHECK(ndr_push_zero(ndr, padding));
 263         }
 264
 265         return NDR_ERR_SUCCESS;
 266 }
 267
 268 /*
 269   parse a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty
 270 */
 271 enum ndr_err_code ndr_pull_dom_sid0(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *sid)
 272 {
 273         if (!(ndr_flags & NDR_SCALARS)) {
 274                 return NDR_ERR_SUCCESS;
 275         }
 276
 277         if (ndr->data_size == ndr->offset) {
 278                 ZERO_STRUCTP(sid);
 279                 return NDR_ERR_SUCCESS;
 280         }
 281
 282         return ndr_pull_dom_sid(ndr, ndr_flags, sid);
 283 }
 284
 285 /*
 286   push a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty
 287 */
 288 enum ndr_err_code ndr_push_dom_sid0(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *sid)
 289 {
 290         struct dom_sid zero_sid;
 291
 292         if (!(ndr_flags & NDR_SCALARS)) {
 293                 return NDR_ERR_SUCCESS;
 294         }
 295
 296         if (!sid) {
 297                 return NDR_ERR_SUCCESS;
 298         }
 299
 300         ZERO_STRUCT(zero_sid);
 301
 302         if (memcmp(&zero_sid, sid, sizeof(zero_sid)) == 0) {
 303                 return NDR_ERR_SUCCESS;
 304         }
 305
 306         return ndr_push_dom_sid(ndr, ndr_flags, sid);
 307 }
 308
 309 _PUBLIC_ enum ndr_err_code ndr_push_dom_sid(struct ndr_push *ndr, int ndr_flags, const struct dom_sid *r)
 310 {
 311         uint32_t cntr_sub_auths_0;
 312         if (ndr_flags & NDR_SCALARS) {
 313                 NDR_CHECK(ndr_push_align(ndr, 4));
 314                 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, r->sid_rev_num));
 315                 NDR_CHECK(ndr_push_int8(ndr, NDR_SCALARS, r->num_auths));
 316                 NDR_CHECK(ndr_push_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6));
 317                 if (r->num_auths < 0 || r->num_auths > ARRAY_SIZE(r->sub_auths)) {
 318                         return ndr_push_error(ndr, NDR_ERR_RANGE, "value out of range");
 319                 }
 320                 for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) {
 321                         NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->sub_auths[cntr_sub_auths_0]));
 322                 }
 323         }
 324         return NDR_ERR_SUCCESS;
 325 }
 326
 327 _PUBLIC_ enum ndr_err_code ndr_pull_dom_sid(struct ndr_pull *ndr, int ndr_flags, struct dom_sid *r)
 328 {
 329         uint32_t cntr_sub_auths_0;
 330         if (ndr_flags & NDR_SCALARS) {
 331                 NDR_CHECK(ndr_pull_align(ndr, 4));
 332                 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &r->sid_rev_num));
 333                 NDR_CHECK(ndr_pull_int8(ndr, NDR_SCALARS, &r->num_auths));
 334                 if (r->num_auths < 0 || r->num_auths > ARRAY_SIZE(r->sub_auths)) {
 335                         return ndr_pull_error(ndr, NDR_ERR_RANGE, "value out of range");
 336                 }
 337                 NDR_CHECK(ndr_pull_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6));
 338                 ZERO_STRUCT(r->sub_auths);
 339                 for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) {
 340                         NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->sub_auths[cntr_sub_auths_0]));
 341                 }
 342         }
 343         return NDR_ERR_SUCCESS;
 344 }