source4/lib/ldb/samba/ldif_handlers.c

   1 /*
   2    ldb database library - ldif handlers for Samba
   3
   4    Copyright (C) Andrew Tridgell 2005
   5    Copyright (C) Andrew Bartlett 2006
   6      ** NOTE! The following LGPL license applies to the ldb
   7      ** library. This does NOT imply that all of Samba is released
   8      ** under the LGPL
   9
  10    This library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 2 of the License, or (at your option) any later version.
  14
  15    This library 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 GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with this library; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23 */
  24
  25 #include "includes.h"
  26 #include "ldb/include/includes.h"
  27 #include "ldb/include/ldb_handlers.h"
  28
  29 #include "librpc/gen_ndr/ndr_security.h"
  30 #include "librpc/gen_ndr/ndr_misc.h"
  31 #include "dsdb/samdb/samdb.h"
  32 #include "libcli/security/security.h"
  33
  34 /*
  35   convert a ldif formatted objectSid to a NDR formatted blob
  36 */
  37 static int ldif_read_objectSid(struct ldb_context *ldb, void *mem_ctx,
  38                                const struct ldb_val *in, struct ldb_val *out)
  39 {
  40         struct dom_sid *sid;
  41         NTSTATUS status;
  42         sid = dom_sid_parse_talloc(mem_ctx, (const char *)in->data);
  43         if (sid == NULL) {
  44                 return -1;
  45         }
  46         status = ndr_push_struct_blob(out, mem_ctx, sid,
  47                                       (ndr_push_flags_fn_t)ndr_push_dom_sid);
  48         talloc_free(sid);
  49         if (!NT_STATUS_IS_OK(status)) {
  50                 return -1;
  51         }
  52         return 0;
  53 }
  54
  55 /*
  56   convert a NDR formatted blob to a ldif formatted objectSid
  57 */
  58 static int ldif_write_objectSid(struct ldb_context *ldb, void *mem_ctx,
  59                                 const struct ldb_val *in, struct ldb_val *out)
  60 {
  61         struct dom_sid *sid;
  62         NTSTATUS status;
  63         sid = talloc(mem_ctx, struct dom_sid);
  64         if (sid == NULL) {
  65                 return -1;
  66         }
  67         status = ndr_pull_struct_blob(in, sid, sid,
  68                                       (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
  69         if (!NT_STATUS_IS_OK(status)) {
  70                 talloc_free(sid);
  71                 return -1;
  72         }
  73         out->data = (uint8_t *)dom_sid_string(mem_ctx, sid);
  74         talloc_free(sid);
  75         if (out->data == NULL) {
  76                 return -1;
  77         }
  78         out->length = strlen((const char *)out->data);
  79         return 0;
  80 }
  81
  82 static BOOL ldb_comparision_objectSid_isString(const struct ldb_val *v)
  83 {
  84         if (v->length < 3) {
  85                 return False;
  86         }
  87
  88         if (strncmp("S-", (const char *)v->data, 2) != 0) return False;
  89
  90         return True;
  91 }
  92
  93 /*
  94   compare two objectSids
  95 */
  96 static int ldb_comparison_objectSid(struct ldb_context *ldb, void *mem_ctx,
  97                                     const struct ldb_val *v1, const struct ldb_val *v2)
  98 {
  99         if (ldb_comparision_objectSid_isString(v1) && ldb_comparision_objectSid_isString(v2)) {
 100                 return strcmp((const char *)v1->data, (const char *)v2->data);
 101         } else if (ldb_comparision_objectSid_isString(v1)
 102                    && !ldb_comparision_objectSid_isString(v2)) {
 103                 struct ldb_val v;
 104                 int ret;
 105                 if (ldif_read_objectSid(ldb, mem_ctx, v1, &v) != 0) {
 106                         return -1;
 107                 }
 108                 ret = ldb_comparison_binary(ldb, mem_ctx, &v, v2);
 109                 talloc_free(v.data);
 110                 return ret;
 111         } else if (!ldb_comparision_objectSid_isString(v1)
 112                    && ldb_comparision_objectSid_isString(v2)) {
 113                 struct ldb_val v;
 114                 int ret;
 115                 if (ldif_read_objectSid(ldb, mem_ctx, v2, &v) != 0) {
 116                         return -1;
 117                 }
 118                 ret = ldb_comparison_binary(ldb, mem_ctx, v1, &v);
 119                 talloc_free(v.data);
 120                 return ret;
 121         }
 122         return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
 123 }
 124
 125 /*
 126   canonicalise a objectSid
 127 */
 128 static int ldb_canonicalise_objectSid(struct ldb_context *ldb, void *mem_ctx,
 129                                       const struct ldb_val *in, struct ldb_val *out)
 130 {
 131         if (ldb_comparision_objectSid_isString(in)) {
 132                 return ldif_read_objectSid(ldb, mem_ctx, in, out);
 133         }
 134         return ldb_handler_copy(ldb, mem_ctx, in, out);
 135 }
 136
 137 /*
 138   convert a ldif formatted objectGUID to a NDR formatted blob
 139 */
 140 static int ldif_read_objectGUID(struct ldb_context *ldb, void *mem_ctx,
 141                                 const struct ldb_val *in, struct ldb_val *out)
 142 {
 143         struct GUID guid;
 144         NTSTATUS status;
 145
 146         status = GUID_from_string((const char *)in->data, &guid);
 147         if (!NT_STATUS_IS_OK(status)) {
 148                 return -1;
 149         }
 150
 151         status = ndr_push_struct_blob(out, mem_ctx, &guid,
 152                                       (ndr_push_flags_fn_t)ndr_push_GUID);
 153         if (!NT_STATUS_IS_OK(status)) {
 154                 return -1;
 155         }
 156         return 0;
 157 }
 158
 159 /*
 160   convert a NDR formatted blob to a ldif formatted objectGUID
 161 */
 162 static int ldif_write_objectGUID(struct ldb_context *ldb, void *mem_ctx,
 163                                  const struct ldb_val *in, struct ldb_val *out)
 164 {
 165         struct GUID guid;
 166         NTSTATUS status;
 167         status = ndr_pull_struct_blob(in, mem_ctx, &guid,
 168                                       (ndr_pull_flags_fn_t)ndr_pull_GUID);
 169         if (!NT_STATUS_IS_OK(status)) {
 170                 return -1;
 171         }
 172         out->data = (uint8_t *)GUID_string(mem_ctx, &guid);
 173         if (out->data == NULL) {
 174                 return -1;
 175         }
 176         out->length = strlen((const char *)out->data);
 177         return 0;
 178 }
 179
 180 static BOOL ldb_comparision_objectGUID_isString(const struct ldb_val *v)
 181 {
 182         struct GUID guid;
 183         NTSTATUS status;
 184
 185         if (v->length < 33) return False;
 186
 187         /* see if the input if null-terninated (safety check for the below) */
 188         if (v->data[v->length] != '\0') return False;
 189
 190         status = GUID_from_string((const char *)v->data, &guid);
 191         if (!NT_STATUS_IS_OK(status)) {
 192                 return False;
 193         }
 194
 195         return True;
 196 }
 197
 198 /*
 199   compare two objectGUIDs
 200 */
 201 static int ldb_comparison_objectGUID(struct ldb_context *ldb, void *mem_ctx,
 202                                      const struct ldb_val *v1, const struct ldb_val *v2)
 203 {
 204         if (ldb_comparision_objectGUID_isString(v1) && ldb_comparision_objectGUID_isString(v2)) {
 205                 return strcmp((const char *)v1->data, (const char *)v2->data);
 206         } else if (ldb_comparision_objectGUID_isString(v1)
 207                    && !ldb_comparision_objectGUID_isString(v2)) {
 208                 struct ldb_val v;
 209                 int ret;
 210                 if (ldif_read_objectGUID(ldb, mem_ctx, v1, &v) != 0) {
 211                         return -1;
 212                 }
 213                 ret = ldb_comparison_binary(ldb, mem_ctx, &v, v2);
 214                 talloc_free(v.data);
 215                 return ret;
 216         } else if (!ldb_comparision_objectGUID_isString(v1)
 217                    && ldb_comparision_objectGUID_isString(v2)) {
 218                 struct ldb_val v;
 219                 int ret;
 220                 if (ldif_read_objectGUID(ldb, mem_ctx, v2, &v) != 0) {
 221                         return -1;
 222                 }
 223                 ret = ldb_comparison_binary(ldb, mem_ctx, v1, &v);
 224                 talloc_free(v.data);
 225                 return ret;
 226         }
 227         return ldb_comparison_binary(ldb, mem_ctx, v1, v2);
 228 }
 229
 230 /*
 231   canonicalise a objectGUID
 232 */
 233 static int ldb_canonicalise_objectGUID(struct ldb_context *ldb, void *mem_ctx,
 234                                        const struct ldb_val *in, struct ldb_val *out)
 235 {
 236         if (ldb_comparision_objectGUID_isString(in)) {
 237                 return ldif_read_objectGUID(ldb, mem_ctx, in, out);
 238         }
 239         return ldb_handler_copy(ldb, mem_ctx, in, out);
 240 }
 241
 242
 243 /*
 244   convert a ldif (SDDL) formatted ntSecurityDescriptor to a NDR formatted blob
 245 */
 246 static int ldif_read_ntSecurityDescriptor(struct ldb_context *ldb, void *mem_ctx,
 247                                           const struct ldb_val *in, struct ldb_val *out)
 248 {
 249         struct security_descriptor *sd;
 250         NTSTATUS status;
 251
 252         sd = sddl_decode(mem_ctx, (const char *)in->data, NULL);
 253         if (sd == NULL) {
 254                 return -1;
 255         }
 256         status = ndr_push_struct_blob(out, mem_ctx, sd,
 257                                       (ndr_push_flags_fn_t)ndr_push_security_descriptor);
 258         talloc_free(sd);
 259         if (!NT_STATUS_IS_OK(status)) {
 260                 return -1;
 261         }
 262         return 0;
 263 }
 264
 265 /*
 266   convert a NDR formatted blob to a ldif formatted ntSecurityDescriptor (SDDL format)
 267 */
 268 static int ldif_write_ntSecurityDescriptor(struct ldb_context *ldb, void *mem_ctx,
 269                                            const struct ldb_val *in, struct ldb_val *out)
 270 {
 271         struct security_descriptor *sd;
 272         NTSTATUS status;
 273
 274         sd = talloc(mem_ctx, struct security_descriptor);
 275         if (sd == NULL) {
 276                 return -1;
 277         }
 278         status = ndr_pull_struct_blob(in, sd, sd,
 279                                       (ndr_pull_flags_fn_t)ndr_pull_security_descriptor);
 280         if (!NT_STATUS_IS_OK(status)) {
 281                 talloc_free(sd);
 282                 return -1;
 283         }
 284         out->data = (uint8_t *)sddl_encode(mem_ctx, sd, NULL);
 285         talloc_free(sd);
 286         if (out->data == NULL) {
 287                 return -1;
 288         }
 289         out->length = strlen((const char *)out->data);
 290         return 0;
 291 }
 292
 293 /*
 294    canonicolise an objectCategory.  We use the short form as the cannoical form:
 295    cn=Person,cn=Schema,cn=Configuration,<basedn> becomes 'person'
 296 */
 297
 298 static int ldif_canonicalise_objectCategory(struct ldb_context *ldb, void *mem_ctx,
 299                                             const struct ldb_val *in, struct ldb_val *out)
 300 {
 301         struct ldb_dn *dn1 = NULL;
 302         char *oc1, *oc2;
 303
 304         dn1 = ldb_dn_new(mem_ctx, ldb, (char *)in->data);
 305         if ( ! ldb_dn_validate(dn1)) {
 306                 oc1 = talloc_strndup(mem_ctx, (char *)in->data, in->length);
 307         } else if (ldb_dn_get_comp_num(dn1) >= 1 && strcasecmp(ldb_dn_get_rdn_name(dn1), "cn") == 0) {
 308                 const struct ldb_val *val = ldb_dn_get_rdn_val(dn1);
 309                 oc1 = talloc_strndup(mem_ctx, (char *)val->data, val->length);
 310         } else {
 311                 return -1;
 312         }
 313
 314         oc2 = ldb_casefold(ldb, mem_ctx, oc1);
 315         out->data = (void *)oc2;
 316         out->length = strlen(oc2);
 317         talloc_free(oc1);
 318         talloc_free(dn1);
 319         return 0;
 320 }
 321
 322 static int ldif_comparison_objectCategory(struct ldb_context *ldb, void *mem_ctx,
 323                                           const struct ldb_val *v1,
 324                                           const struct ldb_val *v2)
 325 {
 326         struct ldb_dn *dn1 = NULL, *dn2 = NULL;
 327         const char *oc1, *oc2;
 328
 329         dn1 = ldb_dn_new(mem_ctx, ldb, (char *)v1->data);
 330         if ( ! ldb_dn_validate(dn1)) {
 331                 oc1 = talloc_strndup(mem_ctx, (char *)v1->data, v1->length);
 332         } else if (ldb_dn_get_comp_num(dn1) >= 1 && strcasecmp(ldb_dn_get_rdn_name(dn1), "cn") == 0) {
 333                 const struct ldb_val *val = ldb_dn_get_rdn_val(dn1);
 334                 oc1 = talloc_strndup(mem_ctx, (char *)val->data, val->length);
 335         } else {
 336                 oc1 = NULL;
 337         }
 338
 339         dn2 = ldb_dn_new(mem_ctx, ldb, (char *)v2->data);
 340         if ( ! ldb_dn_validate(dn2)) {
 341                 oc2 = talloc_strndup(mem_ctx, (char *)v2->data, v2->length);
 342         } else if (ldb_dn_get_comp_num(dn2) >= 2 && strcasecmp(ldb_dn_get_rdn_name(dn2), "cn") == 0) {
 343                 const struct ldb_val *val = ldb_dn_get_rdn_val(dn2);
 344                 oc2 = talloc_strndup(mem_ctx, (char *)val->data, val->length);
 345         } else {
 346                 oc2 = NULL;
 347         }
 348
 349         oc1 = ldb_casefold(ldb, mem_ctx, oc1);
 350         oc2 = ldb_casefold(ldb, mem_ctx, oc2);
 351         if (!oc1 && oc2) {
 352                 return -1;
 353         }
 354         if (oc1 && !oc2) {
 355                 return 1;
 356         }
 357         if (!oc1 && !oc2) {
 358                 return -1;
 359         }
 360
 361         return strcmp(oc1, oc2);
 362 }
 363
 364 #define LDB_SYNTAX_SAMBA_SID                    "LDB_SYNTAX_SAMBA_SID"
 365 #define LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR    "LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR"
 366 #define LDB_SYNTAX_SAMBA_GUID                   "LDB_SYNTAX_SAMBA_GUID"
 367 #define LDB_SYNTAX_SAMBA_OBJECT_CATEGORY        "LDB_SYNTAX_SAMBA_OBJECT_CATEGORY"
 368
 369 static const struct ldb_schema_syntax samba_syntaxes[] = {
 370         {
 371                 .name           = LDB_SYNTAX_SAMBA_SID,
 372                 .ldif_read_fn   = ldif_read_objectSid,
 373                 .ldif_write_fn  = ldif_write_objectSid,
 374                 .canonicalise_fn= ldb_canonicalise_objectSid,
 375                 .comparison_fn  = ldb_comparison_objectSid
 376         },{
 377                 .name           = LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR,
 378                 .ldif_read_fn   = ldif_read_ntSecurityDescriptor,
 379                 .ldif_write_fn  = ldif_write_ntSecurityDescriptor,
 380                 .canonicalise_fn= ldb_handler_copy,
 381                 .comparison_fn  = ldb_comparison_binary
 382         },{
 383                 .name           = LDB_SYNTAX_SAMBA_GUID,
 384                 .ldif_read_fn   = ldif_read_objectGUID,
 385                 .ldif_write_fn  = ldif_write_objectGUID,
 386                 .canonicalise_fn= ldb_canonicalise_objectGUID,
 387                 .comparison_fn  = ldb_comparison_objectGUID
 388         },{
 389                 .name           = LDB_SYNTAX_SAMBA_OBJECT_CATEGORY,
 390                 .ldif_read_fn   = ldb_handler_copy,
 391                 .ldif_write_fn  = ldb_handler_copy,
 392                 .canonicalise_fn= ldif_canonicalise_objectCategory,
 393                 .comparison_fn  = ldif_comparison_objectCategory
 394         }
 395 };
 396
 397 static const struct {
 398         const char *name;
 399         const char *syntax;
 400 } samba_attributes[] = {
 401         { "objectSid",                  LDB_SYNTAX_SAMBA_SID },
 402         { "securityIdentifier",         LDB_SYNTAX_SAMBA_SID },
 403         { "ntSecurityDescriptor",       LDB_SYNTAX_SAMBA_SECURITY_DESCRIPTOR },
 404         { "objectGUID",                 LDB_SYNTAX_SAMBA_GUID },
 405         { "invocationId",               LDB_SYNTAX_SAMBA_GUID },
 406         { "schemaIDGUID",               LDB_SYNTAX_SAMBA_GUID },
 407         { "attributeSecurityGUID",      LDB_SYNTAX_SAMBA_GUID },
 408         { "parentGUID",                 LDB_SYNTAX_SAMBA_GUID },
 409         { "siteGUID",                   LDB_SYNTAX_SAMBA_GUID },
 410         { "pKTGUID",                    LDB_SYNTAX_SAMBA_GUID },
 411         { "fRSVersionGUID",             LDB_SYNTAX_SAMBA_GUID },
 412         { "fRSReplicaSetGUID",          LDB_SYNTAX_SAMBA_GUID },
 413         { "netbootGUID",                LDB_SYNTAX_SAMBA_GUID },
 414         { "objectCategory",             LDB_SYNTAX_SAMBA_OBJECT_CATEGORY },
 415         { "member",                     LDB_SYNTAX_DN },
 416         { "memberOf",                   LDB_SYNTAX_DN },
 417         { "nCName",                     LDB_SYNTAX_DN },
 418         { "schemaNamingContext",        LDB_SYNTAX_DN },
 419         { "configurationNamingContext", LDB_SYNTAX_DN },
 420         { "rootDomainNamingContext",    LDB_SYNTAX_DN },
 421         { "defaultNamingContext",       LDB_SYNTAX_DN },
 422         { "subRefs",                    LDB_SYNTAX_DN },
 423         { "dMDLocation",                LDB_SYNTAX_DN },
 424         { "serverReference",            LDB_SYNTAX_DN },
 425         { "masteredBy",                 LDB_SYNTAX_DN },
 426         { "msDs-masteredBy",            LDB_SYNTAX_DN },
 427         { "fSMORoleOwner",              LDB_SYNTAX_DN },
 428 };
 429
 430 /*
 431   register the samba ldif handlers
 432 */
 433 int ldb_register_samba_handlers(struct ldb_context *ldb)
 434 {
 435         uint32_t i;
 436
 437         for (i=0; i < ARRAY_SIZE(samba_attributes); i++) {
 438                 int ret;
 439                 uint32_t j;
 440                 struct ldb_schema_syntax *s = NULL;
 441
 442                 for (j=0; j < ARRAY_SIZE(samba_syntaxes); j++) {
 443                         if (strcmp(samba_attributes[i].syntax, samba_syntaxes[j].name) == 0) {
 444                                 s = &samba_syntaxes[j];
 445                                 break;
 446                         }
 447                 }
 448
 449                 if (!s) {
 450                         s = ldb_standard_syntax_by_name(ldb, samba_attributes[i].syntax);
 451                 }
 452
 453                 if (!s) {
 454                         return -1;
 455                 }
 456
 457                 ret = ldb_schema_attribute_add_with_syntax(ldb, samba_attributes[i].name, 0, s);
 458                 if (ret != LDB_SUCCESS) {
 459                         return ret;
 460                 }
 461         }
 462
 463         return LDB_SUCCESS;
 464 }