source/rpc_parse/parse_sec.c

   1 /*
   2  *  Unix SMB/Netbios implementation.
   3  *  Version 1.9.
   4  *  RPC Pipe client / server routines
   5  *  Copyright (C) Andrew Tridgell              1992-1998,
   6  *  Copyright (C) Jeremy R. Allison            1995-2005.
   7  *  Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
   8  *  Copyright (C) Paul Ashton                  1997-1998.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 3 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "includes.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_RPC_PARSE
  28
  29 /*******************************************************************
  30  Reads or writes a SEC_ACE structure.
  31 ********************************************************************/
  32
  33 static bool sec_io_ace(const char *desc, SEC_ACE *psa, prs_struct *ps,
  34                        int depth)
  35 {
  36         uint32 old_offset;
  37         uint32 offset_ace_size;
  38         uint8 type;
  39
  40         if (psa == NULL)
  41                 return False;
  42
  43         prs_debug(ps, depth, desc, "sec_io_ace");
  44         depth++;
  45
  46         old_offset = prs_offset(ps);
  47
  48         if (MARSHALLING(ps)) {
  49                 type = (uint8)psa->type;
  50         }
  51
  52         if(!prs_uint8("type ", ps, depth, &type))
  53                 return False;
  54
  55         if (UNMARSHALLING(ps)) {
  56                 psa->type = (enum security_ace_type)type;
  57         }
  58
  59         if(!prs_uint8("flags", ps, depth, &psa->flags))
  60                 return False;
  61
  62         if(!prs_uint16_pre("size ", ps, depth, &psa->size, &offset_ace_size))
  63                 return False;
  64
  65         if(!prs_uint32("access_mask", ps, depth, &psa->access_mask))
  66                 return False;
  67
  68         /* check whether object access is present */
  69         if (!sec_ace_object(psa->type)) {
  70                 if (!smb_io_dom_sid("trustee  ", &psa->trustee , ps, depth))
  71                         return False;
  72         } else {
  73                 if (!prs_uint32("obj_flags", ps, depth, &psa->object.object.flags))
  74                         return False;
  75
  76                 if (psa->object.object.flags & SEC_ACE_OBJECT_PRESENT)
  77                         if (!smb_io_uuid("obj_guid", &psa->object.object.type.type, ps,depth))
  78                                 return False;
  79
  80                 if (psa->object.object.flags & SEC_ACE_OBJECT_INHERITED_PRESENT)
  81                         if (!smb_io_uuid("inh_guid", &psa->object.object.inherited_type.inherited_type, ps,depth))
  82                                 return False;
  83
  84                 if(!smb_io_dom_sid("trustee  ", &psa->trustee , ps, depth))
  85                         return False;
  86         }
  87
  88         /* Theorectically an ACE can have a size greater than the
  89            sum of its components. When marshalling, pad with extra null bytes up to the
  90            correct size. */
  91
  92         if (MARSHALLING(ps) && (psa->size > prs_offset(ps) - old_offset)) {
  93                 uint32 extra_len = psa->size - (prs_offset(ps) - old_offset);
  94                 uint32 i;
  95                 uint8 c = 0;
  96
  97                 for (i = 0; i < extra_len; i++) {
  98                         if (!prs_uint8("ace extra space", ps, depth, &c))
  99                                 return False;
 100                 }
 101         }
 102
 103         if(!prs_uint16_post("size ", ps, depth, &psa->size, offset_ace_size, old_offset))
 104                 return False;
 105
 106         return True;
 107 }
 108
 109 /*******************************************************************
 110  Reads or writes a SEC_ACL structure.
 111
 112  First of the xx_io_xx functions that allocates its data structures
 113  for you as it reads them.
 114 ********************************************************************/
 115
 116 static bool sec_io_acl(const char *desc, SEC_ACL **ppsa, prs_struct *ps,
 117                        int depth)
 118 {
 119         unsigned int i;
 120         uint32 old_offset;
 121         uint32 offset_acl_size;
 122         SEC_ACL *psa;
 123         uint16 revision;
 124
 125         /*
 126          * Note that the size is always a multiple of 4 bytes due to the
 127          * nature of the data structure.  Therefore the prs_align() calls
 128          * have been removed as they through us off when doing two-layer
 129          * marshalling such as in the printing code (RPC_BUFFER).  --jerry
 130          */
 131
 132         if (ppsa == NULL)
 133                 return False;
 134
 135         psa = *ppsa;
 136
 137         if(UNMARSHALLING(ps) && psa == NULL) {
 138                 /*
 139                  * This is a read and we must allocate the stuct to read into.
 140                  */
 141                 if((psa = PRS_ALLOC_MEM(ps, SEC_ACL, 1)) == NULL)
 142                         return False;
 143                 *ppsa = psa;
 144         }
 145
 146         prs_debug(ps, depth, desc, "sec_io_acl");
 147         depth++;
 148
 149         old_offset = prs_offset(ps);
 150
 151         if (MARSHALLING(ps)) {
 152                 revision = (uint16)psa->revision;
 153         }
 154
 155         if(!prs_uint16("revision", ps, depth, &revision))
 156                 return False;
 157
 158         if (UNMARSHALLING(ps)) {
 159                 psa->revision = (enum security_acl_revision)revision;
 160         }
 161
 162         if(!prs_uint16_pre("size     ", ps, depth, &psa->size, &offset_acl_size))
 163                 return False;
 164
 165         if(!prs_uint32("num_aces ", ps, depth, &psa->num_aces))
 166                 return False;
 167
 168         if (UNMARSHALLING(ps)) {
 169                 if (psa->num_aces) {
 170                         if((psa->aces = PRS_ALLOC_MEM(ps, SEC_ACE, psa->num_aces)) == NULL)
 171                                 return False;
 172                 } else {
 173                         psa->aces = NULL;
 174                 }
 175         }
 176
 177         for (i = 0; i < psa->num_aces; i++) {
 178                 fstring tmp;
 179                 slprintf(tmp, sizeof(tmp)-1, "ace_list[%02d]: ", i);
 180                 if(!sec_io_ace(tmp, &psa->aces[i], ps, depth))
 181                         return False;
 182         }
 183
 184         /* Theorectically an ACL can have a size greater than the
 185            sum of its components. When marshalling, pad with extra null bytes up to the
 186            correct size. */
 187
 188         if (MARSHALLING(ps) && (psa->size > prs_offset(ps) - old_offset)) {
 189                 uint32 extra_len = psa->size - (prs_offset(ps) - old_offset);
 190                 uint8 c = 0;
 191
 192                 for (i = 0; i < extra_len; i++) {
 193                         if (!prs_uint8("acl extra space", ps, depth, &c))
 194                                 return False;
 195                 }
 196         }
 197
 198         if(!prs_uint16_post("size     ", ps, depth, &psa->size, offset_acl_size, old_offset))
 199                 return False;
 200
 201         return True;
 202 }
 203
 204 /*******************************************************************
 205  Reads or writes a SEC_DESC structure.
 206  If reading and the *ppsd = NULL, allocates the structure.
 207 ********************************************************************/
 208
 209 bool sec_io_desc(const char *desc, SEC_DESC **ppsd, prs_struct *ps, int depth)
 210 {
 211         uint32 old_offset;
 212         uint32 max_offset = 0; /* after we're done, move offset to end */
 213         uint32 tmp_offset = 0;
 214         uint32 off_sacl, off_dacl, off_owner_sid, off_grp_sid;
 215         uint16 revision;
 216
 217         SEC_DESC *psd;
 218
 219         if (ppsd == NULL)
 220                 return False;
 221
 222         psd = *ppsd;
 223
 224         if (psd == NULL) {
 225                 if(UNMARSHALLING(ps)) {
 226                         if((psd = PRS_ALLOC_MEM(ps,SEC_DESC,1)) == NULL)
 227                                 return False;
 228                         *ppsd = psd;
 229                 } else {
 230                         /* Marshalling - just ignore. */
 231                         return True;
 232                 }
 233         }
 234
 235         prs_debug(ps, depth, desc, "sec_io_desc");
 236         depth++;
 237
 238         /* start of security descriptor stored for back-calc offset purposes */
 239         old_offset = prs_offset(ps);
 240
 241         if (MARSHALLING(ps)) {
 242                 revision = (uint16)psd->revision;
 243         }
 244
 245         if(!prs_uint16("revision", ps, depth, &revision))
 246                 return False;
 247
 248         if (UNMARSHALLING(ps)) {
 249                 psd->revision = (enum security_descriptor_revision)revision;
 250         }
 251
 252         if(!prs_uint16("type     ", ps, depth, &psd->type))
 253                 return False;
 254
 255         if (MARSHALLING(ps)) {
 256                 uint32 offset = SEC_DESC_HEADER_SIZE;
 257
 258                 /*
 259                  * Work out the offsets here, as we write it out.
 260                  */
 261
 262                 if (psd->sacl != NULL) {
 263                         off_sacl = offset;
 264                         offset += psd->sacl->size;
 265                 } else {
 266                         off_sacl = 0;
 267                 }
 268
 269                 if (psd->dacl != NULL) {
 270                         off_dacl = offset;
 271                         offset += psd->dacl->size;
 272                 } else {
 273                         off_dacl = 0;
 274                 }
 275
 276                 if (psd->owner_sid != NULL) {
 277                         off_owner_sid = offset;
 278                         offset += ndr_size_dom_sid(psd->owner_sid, 0);
 279                 } else {
 280                         off_owner_sid = 0;
 281                 }
 282
 283                 if (psd->group_sid != NULL) {
 284                         off_grp_sid = offset;
 285                         offset += ndr_size_dom_sid(psd->group_sid, 0);
 286                 } else {
 287                         off_grp_sid = 0;
 288                 }
 289         }
 290
 291         if(!prs_uint32("off_owner_sid", ps, depth, &off_owner_sid))
 292                 return False;
 293
 294         if(!prs_uint32("off_grp_sid  ", ps, depth, &off_grp_sid))
 295                 return False;
 296
 297         if(!prs_uint32("off_sacl     ", ps, depth, &off_sacl))
 298                 return False;
 299
 300         if(!prs_uint32("off_dacl     ", ps, depth, &off_dacl))
 301                 return False;
 302
 303         max_offset = MAX(max_offset, prs_offset(ps));
 304
 305         if (off_owner_sid != 0) {
 306
 307                 tmp_offset = prs_offset(ps);
 308                 if(!prs_set_offset(ps, old_offset + off_owner_sid))
 309                         return False;
 310
 311                 if (UNMARSHALLING(ps)) {
 312                         /* reading */
 313                         if((psd->owner_sid = PRS_ALLOC_MEM(ps,DOM_SID,1)) == NULL)
 314                                 return False;
 315                 }
 316
 317                 if(!smb_io_dom_sid("owner_sid ", psd->owner_sid , ps, depth))
 318                         return False;
 319
 320                 max_offset = MAX(max_offset, prs_offset(ps));
 321
 322                 if (!prs_set_offset(ps,tmp_offset))
 323                         return False;
 324         }
 325
 326         if (psd->group_sid != 0) {
 327
 328                 tmp_offset = prs_offset(ps);
 329                 if(!prs_set_offset(ps, old_offset + off_grp_sid))
 330                         return False;
 331
 332                 if (UNMARSHALLING(ps)) {
 333                         /* reading */
 334                         if((psd->group_sid = PRS_ALLOC_MEM(ps,DOM_SID,1)) == NULL)
 335                                 return False;
 336                 }
 337
 338                 if(!smb_io_dom_sid("grp_sid", psd->group_sid, ps, depth))
 339                         return False;
 340
 341                 max_offset = MAX(max_offset, prs_offset(ps));
 342
 343                 if (!prs_set_offset(ps,tmp_offset))
 344                         return False;
 345         }
 346
 347         if ((psd->type & SEC_DESC_SACL_PRESENT) && off_sacl) {
 348                 tmp_offset = prs_offset(ps);
 349                 if(!prs_set_offset(ps, old_offset + off_sacl))
 350                         return False;
 351                 if(!sec_io_acl("sacl", &psd->sacl, ps, depth))
 352                         return False;
 353                 max_offset = MAX(max_offset, prs_offset(ps));
 354                 if (!prs_set_offset(ps,tmp_offset))
 355                         return False;
 356         }
 357
 358         if ((psd->type & SEC_DESC_DACL_PRESENT) && off_dacl != 0) {
 359                 tmp_offset = prs_offset(ps);
 360                 if(!prs_set_offset(ps, old_offset + off_dacl))
 361                         return False;
 362                 if(!sec_io_acl("dacl", &psd->dacl, ps, depth))
 363                         return False;
 364                 max_offset = MAX(max_offset, prs_offset(ps));
 365                 if (!prs_set_offset(ps,tmp_offset))
 366                         return False;
 367         }
 368
 369         if(!prs_set_offset(ps, max_offset))
 370                 return False;
 371
 372         return True;
 373 }
 374
 375 /*******************************************************************
 376  Reads or writes a SEC_DESC_BUF structure.
 377 ********************************************************************/
 378
 379 bool sec_io_desc_buf(const char *desc, SEC_DESC_BUF **ppsdb, prs_struct *ps, int depth)
 380 {
 381         uint32 off_len;
 382         uint32 off_max_len;
 383         uint32 old_offset;
 384         uint32 size;
 385         uint32 len;
 386         SEC_DESC_BUF *psdb;
 387         uint32 ptr;
 388
 389         if (ppsdb == NULL)
 390                 return False;
 391
 392         psdb = *ppsdb;
 393
 394         if (UNMARSHALLING(ps) && psdb == NULL) {
 395                 if((psdb = PRS_ALLOC_MEM(ps,SEC_DESC_BUF,1)) == NULL)
 396                         return False;
 397                 *ppsdb = psdb;
 398         }
 399
 400         prs_debug(ps, depth, desc, "sec_io_desc_buf");
 401         depth++;
 402
 403         if(!prs_align(ps))
 404                 return False;
 405
 406         if(!prs_uint32_pre("max_len", ps, depth, &psdb->sd_size, &off_max_len))
 407                 return False;
 408
 409         ptr = 1;
 410         if(!prs_uint32    ("ptr  ", ps, depth, &ptr))
 411                 return False;
 412
 413         len = ndr_size_security_descriptor(psdb->sd, 0);
 414         if(!prs_uint32_pre("len    ", ps, depth, &len, &off_len))
 415                 return False;
 416
 417         old_offset = prs_offset(ps);
 418
 419         /* reading, length is non-zero; writing, descriptor is non-NULL */
 420         if ((UNMARSHALLING(ps) && psdb->sd_size != 0) || (MARSHALLING(ps) && psdb->sd != NULL)) {
 421                 if(!sec_io_desc("sec   ", &psdb->sd, ps, depth))
 422                         return False;
 423         }
 424
 425         if(!prs_align(ps))
 426                 return False;
 427
 428         size = prs_offset(ps) - old_offset;
 429         if(!prs_uint32_post("max_len", ps, depth, &psdb->sd_size, off_max_len, size == 0 ? psdb->sd_size : size))
 430                 return False;
 431
 432         if(!prs_uint32_post("len    ", ps, depth, &len, off_len, size))
 433                 return False;
 434
 435         return True;
 436 }