libcli/security/sddl.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    security descriptor description language functions
   5
   6    Copyright (C) Andrew Tridgell                2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libcli/security/security.h"
  24 #include "librpc/gen_ndr/ndr_misc.h"
  25 #include "system/locale.h"
  26
  27 struct flag_map {
  28         const char *name;
  29         uint32_t flag;
  30 };
  31
  32 static bool sddl_map_flag(
  33         const struct flag_map *map,
  34         const char *str,
  35         size_t *plen,
  36         uint32_t *pflag)
  37 {
  38         while (map->name != NULL) {
  39                 size_t len = strlen(map->name);
  40                 int cmp = strncmp(map->name, str, len);
  41
  42                 if (cmp == 0) {
  43                         *plen = len;
  44                         *pflag = map->flag;
  45                         return true;
  46                 }
  47                 map += 1;
  48         }
  49         return false;
  50 }
  51
  52 /*
  53   map a series of letter codes into a uint32_t
  54 */
  55 static bool sddl_map_flags(const struct flag_map *map, const char *str,
  56                            uint32_t *pflags, size_t *plen)
  57 {
  58         const char *str0 = str;
  59         if (plen != NULL) {
  60                 *plen = 0;
  61         }
  62         *pflags = 0;
  63         while (str[0] && isupper(str[0])) {
  64                 size_t len;
  65                 uint32_t flags;
  66                 bool found;
  67
  68                 found = sddl_map_flag(map, str, &len, &flags);
  69                 if (!found) {
  70                         DEBUG(1, ("Unknown flag - %s in %s\n", str, str0));
  71                         return false;
  72                 }
  73
  74                 *pflags |= flags;
  75                 if (plen != NULL) {
  76                         *plen += len;
  77                 }
  78                 str += len;
  79         }
  80         return true;
  81 }
  82
  83 /*
  84   a mapping between the 2 letter SID codes and sid strings
  85 */
  86 static const struct {
  87         const char *code;
  88         const char *sid;
  89         uint32_t rid;
  90 } sid_codes[] = {
  91         { .code = "WD", .sid = SID_WORLD },
  92
  93         { .code = "CO", .sid = SID_CREATOR_OWNER },
  94         { .code = "CG", .sid = SID_CREATOR_GROUP },
  95         { .code = "OW", .sid = SID_OWNER_RIGHTS },
  96
  97         { .code = "NU", .sid = SID_NT_NETWORK },
  98         { .code = "IU", .sid = SID_NT_INTERACTIVE },
  99         { .code = "SU", .sid = SID_NT_SERVICE },
 100         { .code = "AN", .sid = SID_NT_ANONYMOUS },
 101         { .code = "ED", .sid = SID_NT_ENTERPRISE_DCS },
 102         { .code = "PS", .sid = SID_NT_SELF },
 103         { .code = "AU", .sid = SID_NT_AUTHENTICATED_USERS },
 104         { .code = "RC", .sid = SID_NT_RESTRICTED },
 105         { .code = "SY", .sid = SID_NT_SYSTEM },
 106         { .code = "LS", .sid = SID_NT_LOCAL_SERVICE },
 107         { .code = "NS", .sid = SID_NT_NETWORK_SERVICE },
 108         { .code = "WR", .sid = SID_SECURITY_RESTRICTED_CODE },
 109
 110         { .code = "BA", .sid = SID_BUILTIN_ADMINISTRATORS },
 111         { .code = "BU", .sid = SID_BUILTIN_USERS },
 112         { .code = "BG", .sid = SID_BUILTIN_GUESTS },
 113         { .code = "PU", .sid = SID_BUILTIN_POWER_USERS },
 114         { .code = "AO", .sid = SID_BUILTIN_ACCOUNT_OPERATORS },
 115         { .code = "SO", .sid = SID_BUILTIN_SERVER_OPERATORS },
 116         { .code = "PO", .sid = SID_BUILTIN_PRINT_OPERATORS },
 117         { .code = "BO", .sid = SID_BUILTIN_BACKUP_OPERATORS },
 118         { .code = "RE", .sid = SID_BUILTIN_REPLICATOR },
 119         { .code = "RU", .sid = SID_BUILTIN_PREW2K },
 120         { .code = "RD", .sid = SID_BUILTIN_REMOTE_DESKTOP_USERS },
 121         { .code = "NO", .sid = SID_BUILTIN_NETWORK_CONF_OPERATORS },
 122
 123         { .code = "MU", .sid = SID_BUILTIN_PERFMON_USERS },
 124         { .code = "LU", .sid = SID_BUILTIN_PERFLOG_USERS },
 125         { .code = "IS", .sid = SID_BUILTIN_IUSERS },
 126         { .code = "CY", .sid = SID_BUILTIN_CRYPTO_OPERATORS },
 127         { .code = "ER", .sid = SID_BUILTIN_EVENT_LOG_READERS },
 128         { .code = "CD", .sid = SID_BUILTIN_CERT_SERV_DCOM_ACCESS },
 129         { .code = "RA", .sid = SID_BUILTIN_RDS_REMOTE_ACCESS_SERVERS },
 130         { .code = "ES", .sid = SID_BUILTIN_RDS_ENDPOINT_SERVERS },
 131         { .code = "MS", .sid = SID_BUILTIN_RDS_MANAGEMENT_SERVERS },
 132         { .code = "HA", .sid = SID_BUILTIN_HYPER_V_ADMINS },
 133         { .code = "AA", .sid = SID_BUILTIN_ACCESS_CONTROL_ASSISTANCE_OPS },
 134         { .code = "RM", .sid = SID_BUILTIN_REMOTE_MANAGEMENT_USERS },
 135
 136         { .code = "UD", .sid = SID_USER_MODE_DRIVERS },
 137
 138         { .code = "AC", .sid = SID_SECURITY_BUILTIN_PACKAGE_ANY_PACKAGE },
 139
 140         { .code = "LW", .sid = SID_SECURITY_MANDATORY_LOW },
 141         { .code = "ME", .sid = SID_SECURITY_MANDATORY_MEDIUM },
 142         { .code = "MP", .sid = SID_SECURITY_MANDATORY_MEDIUM_PLUS },
 143         { .code = "HI", .sid = SID_SECURITY_MANDATORY_HIGH },
 144         { .code = "SI", .sid = SID_SECURITY_MANDATORY_SYSTEM },
 145
 146         { .code = "AS", .sid = SID_AUTHENTICATION_AUTHORITY_ASSERTED_IDENTITY },
 147         { .code = "SS", .sid = SID_SERVICE_ASSERTED_IDENTITY },
 148
 149         { .code = "RO", .sid = NULL, .rid = DOMAIN_RID_ENTERPRISE_READONLY_DCS },
 150
 151         { .code = "LA", .sid = NULL, .rid = DOMAIN_RID_ADMINISTRATOR },
 152         { .code = "LG", .sid = NULL, .rid = DOMAIN_RID_GUEST },
 153
 154         { .code = "DA", .sid = NULL, .rid = DOMAIN_RID_ADMINS },
 155         { .code = "DU", .sid = NULL, .rid = DOMAIN_RID_USERS },
 156         { .code = "DG", .sid = NULL, .rid = DOMAIN_RID_GUESTS },
 157         { .code = "DC", .sid = NULL, .rid = DOMAIN_RID_DOMAIN_MEMBERS },
 158         { .code = "DD", .sid = NULL, .rid = DOMAIN_RID_DCS },
 159         { .code = "CA", .sid = NULL, .rid = DOMAIN_RID_CERT_ADMINS },
 160         { .code = "SA", .sid = NULL, .rid = DOMAIN_RID_SCHEMA_ADMINS },
 161         { .code = "EA", .sid = NULL, .rid = DOMAIN_RID_ENTERPRISE_ADMINS },
 162         { .code = "PA", .sid = NULL, .rid = DOMAIN_RID_POLICY_ADMINS },
 163
 164         { .code = "CN", .sid = NULL, .rid = DOMAIN_RID_CLONEABLE_CONTROLLERS },
 165
 166         { .code = "AP", .sid = NULL, .rid = DOMAIN_RID_PROTECTED_USERS },
 167         { .code = "KA", .sid = NULL, .rid = DOMAIN_RID_KEY_ADMINS },
 168         { .code = "EK", .sid = NULL, .rid = DOMAIN_RID_ENTERPRISE_KEY_ADMINS },
 169
 170         { .code = "RS", .sid = NULL, .rid = DOMAIN_RID_RAS_SERVERS }
 171 };
 172
 173 /*
 174   decode a SID
 175   It can either be a special 2 letter code, or in S-* format
 176 */
 177 static struct dom_sid *sddl_decode_sid(TALLOC_CTX *mem_ctx, const char **sddlp,
 178                                        const struct dom_sid *domain_sid)
 179 {
 180         const char *sddl = (*sddlp);
 181         size_t i;
 182
 183         /* see if its in the numeric format */
 184         if (strncmp(sddl, "S-", 2) == 0) {
 185                 struct dom_sid *sid;
 186                 char *sid_str;
 187                 size_t len = strspn(sddl+2, "-0123456789");
 188                 sid_str = talloc_strndup(mem_ctx, sddl, len+2);
 189                 if (!sid_str) {
 190                         return NULL;
 191                 }
 192                 (*sddlp) += len+2;
 193                 sid = dom_sid_parse_talloc(mem_ctx, sid_str);
 194                 talloc_free(sid_str);
 195                 return sid;
 196         }
 197
 198         /* now check for one of the special codes */
 199         for (i=0;i<ARRAY_SIZE(sid_codes);i++) {
 200                 if (strncmp(sid_codes[i].code, sddl, 2) == 0) break;
 201         }
 202         if (i == ARRAY_SIZE(sid_codes)) {
 203                 DEBUG(1,("Unknown sddl sid code '%2.2s'\n", sddl));
 204                 return NULL;
 205         }
 206
 207         (*sddlp) += 2;
 208
 209         if (sid_codes[i].sid == NULL) {
 210                 return dom_sid_add_rid(mem_ctx, domain_sid, sid_codes[i].rid);
 211         }
 212
 213         return dom_sid_parse_talloc(mem_ctx, sid_codes[i].sid);
 214 }
 215
 216 static const struct flag_map ace_types[] = {
 217         { "AU", SEC_ACE_TYPE_SYSTEM_AUDIT },
 218         { "AL", SEC_ACE_TYPE_SYSTEM_ALARM },
 219         { "OA", SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT },
 220         { "OD", SEC_ACE_TYPE_ACCESS_DENIED_OBJECT },
 221         { "OU", SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT },
 222         { "OL", SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT },
 223         { "A",  SEC_ACE_TYPE_ACCESS_ALLOWED },
 224         { "D",  SEC_ACE_TYPE_ACCESS_DENIED },
 225         { NULL, 0 }
 226 };
 227
 228 static const struct flag_map ace_flags[] = {
 229         { "OI", SEC_ACE_FLAG_OBJECT_INHERIT },
 230         { "CI", SEC_ACE_FLAG_CONTAINER_INHERIT },
 231         { "NP", SEC_ACE_FLAG_NO_PROPAGATE_INHERIT },
 232         { "IO", SEC_ACE_FLAG_INHERIT_ONLY },
 233         { "ID", SEC_ACE_FLAG_INHERITED_ACE },
 234         { "SA", SEC_ACE_FLAG_SUCCESSFUL_ACCESS },
 235         { "FA", SEC_ACE_FLAG_FAILED_ACCESS },
 236         { NULL, 0 },
 237 };
 238
 239 static const struct flag_map ace_access_mask[] = {
 240         { "RP", SEC_ADS_READ_PROP },
 241         { "WP", SEC_ADS_WRITE_PROP },
 242         { "CR", SEC_ADS_CONTROL_ACCESS },
 243         { "CC", SEC_ADS_CREATE_CHILD },
 244         { "DC", SEC_ADS_DELETE_CHILD },
 245         { "LC", SEC_ADS_LIST },
 246         { "LO", SEC_ADS_LIST_OBJECT },
 247         { "RC", SEC_STD_READ_CONTROL },
 248         { "WO", SEC_STD_WRITE_OWNER },
 249         { "WD", SEC_STD_WRITE_DAC },
 250         { "SD", SEC_STD_DELETE },
 251         { "DT", SEC_ADS_DELETE_TREE },
 252         { "SW", SEC_ADS_SELF_WRITE },
 253         { "GA", SEC_GENERIC_ALL },
 254         { "GR", SEC_GENERIC_READ },
 255         { "GW", SEC_GENERIC_WRITE },
 256         { "GX", SEC_GENERIC_EXECUTE },
 257         { NULL, 0 }
 258 };
 259
 260 static const struct flag_map decode_ace_access_mask[] = {
 261         { "FA", FILE_ALL_ACCESS },
 262         { "FR", FILE_GENERIC_READ },
 263         { "FW", FILE_GENERIC_WRITE },
 264         { "FX", FILE_GENERIC_EXECUTE },
 265         { NULL, 0 },
 266 };
 267
 268 static bool sddl_decode_access(const char *str, uint32_t *pmask)
 269 {
 270         const char *str0 = str;
 271         uint32_t mask = 0;
 272         int cmp;
 273
 274         cmp = strncmp(str, "0x", 2);
 275         if (cmp == 0) {
 276                 *pmask = strtol(str, NULL, 16);
 277                 return true;
 278         }
 279
 280         while ((str[0] != '\0') && isupper(str[0])) {
 281                 uint32_t flags = 0;
 282                 size_t len = 0;
 283                 bool found;
 284
 285                 found = sddl_map_flag(
 286                         ace_access_mask, str, &len, &flags);
 287                 found |= sddl_map_flag(
 288                         decode_ace_access_mask, str, &len, &flags);
 289                 if (!found) {
 290                         DEBUG(1, ("Unknown flag - %s in %s\n", str, str0));
 291                         return false;
 292                 }
 293                 mask |= flags;
 294                 str += len;
 295         }
 296
 297         *pmask = mask;
 298         return true;
 299 }
 300
 301 /*
 302   decode an ACE
 303   return true on success, false on failure
 304   note that this routine modifies the string
 305 */
 306 static bool sddl_decode_ace(TALLOC_CTX *mem_ctx, struct security_ace *ace, char *str,
 307                             const struct dom_sid *domain_sid)
 308 {
 309         const char *tok[6];
 310         const char *s;
 311         int i;
 312         uint32_t v;
 313         struct dom_sid *sid;
 314         bool ok;
 315
 316         ZERO_STRUCTP(ace);
 317
 318         /* parse out the 6 tokens */
 319         tok[0] = str;
 320         for (i=0;i<5;i++) {
 321                 char *ptr = strchr(str, ';');
 322                 if (ptr == NULL) return false;
 323                 *ptr = 0;
 324                 str = ptr+1;
 325                 tok[i+1] = str;
 326         }
 327
 328         /* parse ace type */
 329         if (!sddl_map_flags(ace_types, tok[0], &v, NULL)) {
 330                 return false;
 331         }
 332         ace->type = v;
 333
 334         /* ace flags */
 335         if (!sddl_map_flags(ace_flags, tok[1], &v, NULL)) {
 336                 return false;
 337         }
 338         ace->flags = v;
 339
 340         /* access mask */
 341         ok = sddl_decode_access(tok[2], &ace->access_mask);
 342         if (!ok) {
 343                 return false;
 344         }
 345
 346         /* object */
 347         if (tok[3][0] != 0) {
 348                 NTSTATUS status = GUID_from_string(tok[3],
 349                                                    &ace->object.object.type.type);
 350                 if (!NT_STATUS_IS_OK(status)) {
 351                         return false;
 352                 }
 353                 ace->object.object.flags |= SEC_ACE_OBJECT_TYPE_PRESENT;
 354         }
 355
 356         /* inherit object */
 357         if (tok[4][0] != 0) {
 358                 NTSTATUS status = GUID_from_string(tok[4],
 359                                                    &ace->object.object.inherited_type.inherited_type);
 360                 if (!NT_STATUS_IS_OK(status)) {
 361                         return false;
 362                 }
 363                 ace->object.object.flags |= SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT;
 364         }
 365
 366         /* trustee */
 367         s = tok[5];
 368         sid = sddl_decode_sid(mem_ctx, &s, domain_sid);
 369         if (sid == NULL) {
 370                 return false;
 371         }
 372         ace->trustee = *sid;
 373         talloc_free(sid);
 374
 375         return true;
 376 }
 377
 378 static const struct flag_map acl_flags[] = {
 379         { "P", SEC_DESC_DACL_PROTECTED },
 380         { "AR", SEC_DESC_DACL_AUTO_INHERIT_REQ },
 381         { "AI", SEC_DESC_DACL_AUTO_INHERITED },
 382         { NULL, 0 }
 383 };
 384
 385 /*
 386   decode an ACL
 387 */
 388 static struct security_acl *sddl_decode_acl(struct security_descriptor *sd,
 389                                             const char **sddlp, uint32_t *flags,
 390                                             const struct dom_sid *domain_sid)
 391 {
 392         const char *sddl = *sddlp;
 393         struct security_acl *acl;
 394         size_t len;
 395
 396         *flags = 0;
 397
 398         acl = talloc_zero(sd, struct security_acl);
 399         if (acl == NULL) return NULL;
 400         acl->revision = SECURITY_ACL_REVISION_ADS;
 401
 402         if (isupper(sddl[0]) && sddl[1] == ':') {
 403                 /* its an empty ACL */
 404                 return acl;
 405         }
 406
 407         /* work out the ACL flags */
 408         if (!sddl_map_flags(acl_flags, sddl, flags, &len)) {
 409                 talloc_free(acl);
 410                 return NULL;
 411         }
 412         sddl += len;
 413
 414         /* now the ACEs */
 415         while (*sddl == '(') {
 416                 char *astr;
 417                 len = strcspn(sddl+1, ")");
 418                 astr = talloc_strndup(acl, sddl+1, len);
 419                 if (astr == NULL || sddl[len+1] != ')') {
 420                         talloc_free(acl);
 421                         return NULL;
 422                 }
 423                 acl->aces = talloc_realloc(acl, acl->aces, struct security_ace,
 424                                            acl->num_aces+1);
 425                 if (acl->aces == NULL) {
 426                         talloc_free(acl);
 427                         return NULL;
 428                 }
 429                 if (!sddl_decode_ace(acl->aces, &acl->aces[acl->num_aces],
 430                                      astr, domain_sid)) {
 431                         talloc_free(acl);
 432                         return NULL;
 433                 }
 434                 switch (acl->aces[acl->num_aces].type) {
 435                 case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
 436                 case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
 437                 case SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT:
 438                 case SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT:
 439                         acl->revision = SECURITY_ACL_REVISION_ADS;
 440                         break;
 441                 default:
 442                         break;
 443                 }
 444                 talloc_free(astr);
 445                 sddl += len+2;
 446                 acl->num_aces++;
 447         }
 448
 449         (*sddlp) = sddl;
 450         return acl;
 451 }
 452
 453 /*
 454   decode a security descriptor in SDDL format
 455 */
 456 struct security_descriptor *sddl_decode(TALLOC_CTX *mem_ctx, const char *sddl,
 457                                         const struct dom_sid *domain_sid)
 458 {
 459         struct security_descriptor *sd;
 460         sd = talloc_zero(mem_ctx, struct security_descriptor);
 461
 462         sd->revision = SECURITY_DESCRIPTOR_REVISION_1;
 463         sd->type     = SEC_DESC_SELF_RELATIVE;
 464
 465         while (*sddl) {
 466                 uint32_t flags;
 467                 char c = sddl[0];
 468                 if (sddl[1] != ':') goto failed;
 469
 470                 sddl += 2;
 471                 switch (c) {
 472                 case 'D':
 473                         if (sd->dacl != NULL) goto failed;
 474                         sd->dacl = sddl_decode_acl(sd, &sddl, &flags, domain_sid);
 475                         if (sd->dacl == NULL) goto failed;
 476                         sd->type |= flags | SEC_DESC_DACL_PRESENT;
 477                         break;
 478                 case 'S':
 479                         if (sd->sacl != NULL) goto failed;
 480                         sd->sacl = sddl_decode_acl(sd, &sddl, &flags, domain_sid);
 481                         if (sd->sacl == NULL) goto failed;
 482                         /* this relies on the SEC_DESC_SACL_* flags being
 483                            1 bit shifted from the SEC_DESC_DACL_* flags */
 484                         sd->type |= (flags<<1) | SEC_DESC_SACL_PRESENT;
 485                         break;
 486                 case 'O':
 487                         if (sd->owner_sid != NULL) goto failed;
 488                         sd->owner_sid = sddl_decode_sid(sd, &sddl, domain_sid);
 489                         if (sd->owner_sid == NULL) goto failed;
 490                         break;
 491                 case 'G':
 492                         if (sd->group_sid != NULL) goto failed;
 493                         sd->group_sid = sddl_decode_sid(sd, &sddl, domain_sid);
 494                         if (sd->group_sid == NULL) goto failed;
 495                         break;
 496                 }
 497         }
 498
 499         return sd;
 500
 501 failed:
 502         DEBUG(2,("Badly formatted SDDL '%s'\n", sddl));
 503         talloc_free(sd);
 504         return NULL;
 505 }
 506
 507 /*
 508   turn a set of flags into a string
 509 */
 510 static char *sddl_flags_to_string(TALLOC_CTX *mem_ctx, const struct flag_map *map,
 511                                   uint32_t flags, bool check_all)
 512 {
 513         int i;
 514         char *s;
 515
 516         /* try to find an exact match */
 517         for (i=0;map[i].name;i++) {
 518                 if (map[i].flag == flags) {
 519                         return talloc_strdup(mem_ctx, map[i].name);
 520                 }
 521         }
 522
 523         s = talloc_strdup(mem_ctx, "");
 524
 525         /* now by bits */
 526         for (i=0;map[i].name;i++) {
 527                 if ((flags & map[i].flag) != 0) {
 528                         s = talloc_asprintf_append_buffer(s, "%s", map[i].name);
 529                         if (s == NULL) goto failed;
 530                         flags &= ~map[i].flag;
 531                 }
 532         }
 533
 534         if (check_all && flags != 0) {
 535                 goto failed;
 536         }
 537
 538         return s;
 539
 540 failed:
 541         talloc_free(s);
 542         return NULL;
 543 }
 544
 545 /*
 546   encode a sid in SDDL format
 547 */
 548 static char *sddl_encode_sid(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
 549                              const struct dom_sid *domain_sid)
 550 {
 551         size_t i;
 552         char *sidstr;
 553
 554         sidstr = dom_sid_string(mem_ctx, sid);
 555         if (sidstr == NULL) return NULL;
 556
 557         /* seen if its a well known sid */
 558         for (i=0;sid_codes[i].sid;i++) {
 559                 if (strcmp(sidstr, sid_codes[i].sid) == 0) {
 560                         talloc_free(sidstr);
 561                         return talloc_strdup(mem_ctx, sid_codes[i].code);
 562                 }
 563         }
 564
 565         /* or a well known rid in our domain */
 566         if (dom_sid_in_domain(domain_sid, sid)) {
 567                 uint32_t rid = sid->sub_auths[sid->num_auths-1];
 568                 for (;i<ARRAY_SIZE(sid_codes);i++) {
 569                         if (rid == sid_codes[i].rid) {
 570                                 talloc_free(sidstr);
 571                                 return talloc_strdup(mem_ctx, sid_codes[i].code);
 572                         }
 573                 }
 574         }
 575
 576         talloc_free(sidstr);
 577
 578         /* TODO: encode well known sids as two letter codes */
 579         return dom_sid_string(mem_ctx, sid);
 580 }
 581
 582
 583 /*
 584   encode an ACE in SDDL format
 585 */
 586 char *sddl_encode_ace(TALLOC_CTX *mem_ctx, const struct security_ace *ace,
 587                       const struct dom_sid *domain_sid)
 588 {
 589         char *sddl = NULL;
 590         TALLOC_CTX *tmp_ctx;
 591         struct GUID_txt_buf object_buf, iobject_buf;
 592         const char *sddl_type="", *sddl_flags="", *sddl_mask="",
 593                 *sddl_object="", *sddl_iobject="", *sddl_trustee="";
 594
 595         tmp_ctx = talloc_new(mem_ctx);
 596         if (tmp_ctx == NULL) {
 597                 DEBUG(0, ("talloc_new failed\n"));
 598                 return NULL;
 599         }
 600
 601         sddl_type = sddl_flags_to_string(tmp_ctx, ace_types, ace->type, true);
 602         if (sddl_type == NULL) {
 603                 goto failed;
 604         }
 605
 606         sddl_flags = sddl_flags_to_string(tmp_ctx, ace_flags, ace->flags,
 607                                           true);
 608         if (sddl_flags == NULL) {
 609                 goto failed;
 610         }
 611
 612         sddl_mask = sddl_flags_to_string(tmp_ctx, ace_access_mask,
 613                                          ace->access_mask, true);
 614         if (sddl_mask == NULL) {
 615                 sddl_mask = talloc_asprintf(tmp_ctx, "0x%08x",
 616                                              ace->access_mask);
 617                 if (sddl_mask == NULL) {
 618                         goto failed;
 619                 }
 620         }
 621
 622         if (ace->type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT ||
 623             ace->type == SEC_ACE_TYPE_ACCESS_DENIED_OBJECT ||
 624             ace->type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT ||
 625             ace->type == SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT) {
 626                 const struct security_ace_object *object = &ace->object.object;
 627
 628                 if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) {
 629                         sddl_object = GUID_buf_string(
 630                                 &object->type.type, &object_buf);
 631                 }
 632
 633                 if (ace->object.object.flags &
 634                     SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) {
 635                         sddl_iobject = GUID_buf_string(
 636                                 &object->inherited_type.inherited_type,
 637                                 &iobject_buf);
 638                 }
 639         }
 640
 641         sddl_trustee = sddl_encode_sid(tmp_ctx, &ace->trustee, domain_sid);
 642         if (sddl_trustee == NULL) {
 643                 goto failed;
 644         }
 645
 646         sddl = talloc_asprintf(mem_ctx, "%s;%s;%s;%s;%s;%s",
 647                                sddl_type, sddl_flags, sddl_mask, sddl_object,
 648                                sddl_iobject, sddl_trustee);
 649
 650 failed:
 651         talloc_free(tmp_ctx);
 652         return sddl;
 653 }
 654
 655 /*
 656   encode an ACL in SDDL format
 657 */
 658 static char *sddl_encode_acl(TALLOC_CTX *mem_ctx, const struct security_acl *acl,
 659                              uint32_t flags, const struct dom_sid *domain_sid)
 660 {
 661         char *sddl;
 662         uint32_t i;
 663
 664         /* add any ACL flags */
 665         sddl = sddl_flags_to_string(mem_ctx, acl_flags, flags, false);
 666         if (sddl == NULL) goto failed;
 667
 668         /* now the ACEs, encoded in braces */
 669         for (i=0;i<acl->num_aces;i++) {
 670                 char *ace = sddl_encode_ace(sddl, &acl->aces[i], domain_sid);
 671                 if (ace == NULL) goto failed;
 672                 sddl = talloc_asprintf_append_buffer(sddl, "(%s)", ace);
 673                 if (sddl == NULL) goto failed;
 674                 talloc_free(ace);
 675         }
 676
 677         return sddl;
 678
 679 failed:
 680         talloc_free(sddl);
 681         return NULL;
 682 }
 683
 684
 685 /*
 686   encode a security descriptor to SDDL format
 687 */
 688 char *sddl_encode(TALLOC_CTX *mem_ctx, const struct security_descriptor *sd,
 689                   const struct dom_sid *domain_sid)
 690 {
 691         char *sddl;
 692         TALLOC_CTX *tmp_ctx;
 693
 694         /* start with a blank string */
 695         sddl = talloc_strdup(mem_ctx, "");
 696         if (sddl == NULL) goto failed;
 697
 698         tmp_ctx = talloc_new(mem_ctx);
 699
 700         if (sd->owner_sid != NULL) {
 701                 char *sid = sddl_encode_sid(tmp_ctx, sd->owner_sid, domain_sid);
 702                 if (sid == NULL) goto failed;
 703                 sddl = talloc_asprintf_append_buffer(sddl, "O:%s", sid);
 704                 if (sddl == NULL) goto failed;
 705         }
 706
 707         if (sd->group_sid != NULL) {
 708                 char *sid = sddl_encode_sid(tmp_ctx, sd->group_sid, domain_sid);
 709                 if (sid == NULL) goto failed;
 710                 sddl = talloc_asprintf_append_buffer(sddl, "G:%s", sid);
 711                 if (sddl == NULL) goto failed;
 712         }
 713
 714         if ((sd->type & SEC_DESC_DACL_PRESENT) && sd->dacl != NULL) {
 715                 char *acl = sddl_encode_acl(tmp_ctx, sd->dacl, sd->type, domain_sid);
 716                 if (acl == NULL) goto failed;
 717                 sddl = talloc_asprintf_append_buffer(sddl, "D:%s", acl);
 718                 if (sddl == NULL) goto failed;
 719         }
 720
 721         if ((sd->type & SEC_DESC_SACL_PRESENT) && sd->sacl != NULL) {
 722                 char *acl = sddl_encode_acl(tmp_ctx, sd->sacl, sd->type>>1, domain_sid);
 723                 if (acl == NULL) goto failed;
 724                 sddl = talloc_asprintf_append_buffer(sddl, "S:%s", acl);
 725                 if (sddl == NULL) goto failed;
 726         }
 727
 728         talloc_free(tmp_ctx);
 729         return sddl;
 730
 731 failed:
 732         talloc_free(sddl);
 733         return NULL;
 734 }
 735
 736