source4/lib/registry/rpc.c

   1 /*
   2    Samba Unix/Linux SMB implementation
   3    RPC backend for the registry library
   4    Copyright (C) 2003-2007 Jelmer Vernooij, jelmer@samba.org
   5    Copyright (C) 2008 Matthias Dieter Wallnöfer, mwallnoefer@yahoo.de
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "includes.h"
  21 #include "registry.h"
  22 #include "librpc/gen_ndr/ndr_winreg_c.h"
  23
  24 #define MAX_NAMESIZE 512
  25 #define MAX_VALSIZE 32768
  26
  27 struct rpc_key {
  28         struct registry_key key;
  29         struct policy_handle pol;
  30         struct dcerpc_pipe *pipe;
  31
  32         const char* classname;
  33         uint32_t num_subkeys;
  34         uint32_t max_subkeylen;
  35         uint32_t max_subkeysize;
  36         uint32_t num_values;
  37         uint32_t max_valnamelen;
  38         uint32_t max_valbufsize;
  39         uint32_t secdescsize;
  40         NTTIME last_changed_time;
  41 };
  42
  43 struct rpc_registry_context {
  44         struct registry_context context;
  45         struct dcerpc_pipe *pipe;
  46 };
  47
  48 static struct registry_operations reg_backend_rpc;
  49
  50 /**
  51  * This is the RPC backend for the registry library.
  52  */
  53
  54 /*
  55  * Converts a SAMBA string into a WINREG string
  56  */
  57 static void chars_to_winreg_String(TALLOC_CTX *mem_ctx, struct winreg_String
  58         *winregStr, const char *str)
  59 {
  60         winregStr->name = NULL;
  61         winregStr->name_len = 0;
  62         if (str != NULL) {
  63                 winregStr->name = talloc_strdup(mem_ctx, str);
  64                 winregStr->name_len = strlen(str);
  65         }
  66         winregStr->name_size = winregStr->name_len;
  67 }
  68
  69 /*
  70  * Converts a WINREG string into a SAMBA string
  71  */
  72 static void winreg_String_to_chars(TALLOC_CTX *mem_ctx, const char **str,
  73         struct winreg_String *winregStr)
  74 {
  75         *str = NULL;
  76         if (winregStr->name != NULL)
  77                 *str = talloc_strdup(mem_ctx, winregStr->name);
  78 }
  79
  80 /*
  81  * Converts a SAMBA string into a WINREG string buffer
  82  */
  83 static void chars_to_winreg_StringBuf(TALLOC_CTX *mem_ctx, struct winreg_StringBuf
  84         *winregStrBuf, const char *str, uint16_t size)
  85 {
  86         winregStrBuf->name = NULL;
  87         winregStrBuf->length = 0;
  88         if (str != NULL) {
  89                 winregStrBuf->name = talloc_strdup(mem_ctx, str);
  90                 winregStrBuf->length = strlen(str);
  91         }
  92         winregStrBuf->size = size;
  93 }
  94
  95 /*
  96  * Converts a WINREG string buffer into a SAMBA string
  97  */
  98 static void winreg_StringBuf_to_chars(TALLOC_CTX *mem_ctx, const char **str,
  99         struct winreg_StringBuf *winregStrBuf)
 100 {
 101         *str = NULL;
 102         if (winregStrBuf->name != NULL)
 103                 *str = talloc_strdup(mem_ctx, winregStrBuf->name);
 104 }
 105
 106 #define openhive(u) static WERROR open_ ## u(struct dcerpc_pipe *p, TALLOC_CTX *mem_ctx, struct policy_handle *hnd) \
 107 { \
 108         struct winreg_Open ## u r; \
 109         NTSTATUS status; \
 110 \
 111         ZERO_STRUCT(r); \
 112         r.in.system_name = NULL; \
 113         r.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED; \
 114         r.out.handle = hnd;\
 115 \
 116         status = dcerpc_winreg_Open ## u(p, mem_ctx, &r); \
 117 \
 118         if (!NT_STATUS_IS_OK(status)) { \
 119                 DEBUG(1, ("OpenHive failed - %s\n", nt_errstr(status))); \
 120                 return ntstatus_to_werror(status); \
 121         } \
 122 \
 123         return r.out.result;\
 124 }
 125
 126 openhive(HKLM)
 127 openhive(HKCU)
 128 openhive(HKPD)
 129 openhive(HKU)
 130 openhive(HKCR)
 131 openhive(HKDD)
 132 openhive(HKCC)
 133
 134 static struct {
 135         uint32_t hkey;
 136         WERROR (*open) (struct dcerpc_pipe *p, TALLOC_CTX *,
 137                         struct policy_handle *h);
 138 } known_hives[] = {
 139         { HKEY_LOCAL_MACHINE, open_HKLM },
 140         { HKEY_CURRENT_USER, open_HKCU },
 141         { HKEY_CLASSES_ROOT, open_HKCR },
 142         { HKEY_PERFORMANCE_DATA, open_HKPD },
 143         { HKEY_USERS, open_HKU },
 144         { HKEY_DYN_DATA, open_HKDD },
 145         { HKEY_CURRENT_CONFIG, open_HKCC },
 146         { 0, NULL }
 147 };
 148
 149 static WERROR rpc_query_key(TALLOC_CTX *mem_ctx, const struct registry_key *k);
 150
 151 static WERROR rpc_get_predefined_key(struct registry_context *ctx,
 152                                      uint32_t hkey_type,
 153                                      struct registry_key **k)
 154 {
 155         int n;
 156         struct rpc_key *mykeydata;
 157         struct rpc_registry_context *rctx = talloc_get_type(ctx, struct rpc_registry_context);
 158
 159         *k = NULL;
 160
 161         for(n = 0; known_hives[n].hkey; n++) {
 162                 if(known_hives[n].hkey == hkey_type)
 163                         break;
 164         }
 165
 166         if (known_hives[n].open == NULL)  {
 167                 DEBUG(1, ("No such hive %d\n", hkey_type));
 168                 return WERR_NO_MORE_ITEMS;
 169         }
 170
 171         mykeydata = talloc_zero(ctx, struct rpc_key);
 172         mykeydata->key.context = ctx;
 173         mykeydata->pipe = talloc_reference(mykeydata, rctx->pipe);
 174         mykeydata->num_values = -1;
 175         mykeydata->num_subkeys = -1;
 176         *k = (struct registry_key *)mykeydata;
 177         return known_hives[n].open(mykeydata->pipe, mykeydata, &(mykeydata->pol));
 178 }
 179
 180 #if 0
 181 static WERROR rpc_key_put_rpc_data(TALLOC_CTX *mem_ctx, struct registry_key *k)
 182 {
 183         struct winreg_OpenKey r;
 184         struct rpc_key_data *mykeydata;
 185
 186         k->backend_data = mykeydata = talloc_zero(mem_ctx, struct rpc_key_data);
 187         mykeydata->num_values = -1;
 188         mykeydata->num_subkeys = -1;
 189
 190         /* Then, open the handle using the hive */
 191
 192         ZERO_STRUCT(r);
 193         r.in.handle = &(((struct rpc_key_data *)k->hive->root->backend_data)->pol);
 194         chars_to_winreg_String(mem_ctx, &r.in.keyname, k->path);
 195         r.in.unknown = 0x00000000;
 196         r.in.access_mask = 0x02000000;
 197         r.out.handle = &mykeydata->pol;
 198
 199         dcerpc_winreg_OpenKey((struct dcerpc_pipe *)k->hive->backend_data,
 200                               mem_ctx, &r);
 201
 202         return r.out.result;
 203 }
 204 #endif
 205
 206 static WERROR rpc_open_key(TALLOC_CTX *mem_ctx, struct registry_key *h,
 207                            const char *name, struct registry_key **key)
 208 {
 209         struct rpc_key *parentkeydata = talloc_get_type(h, struct rpc_key),
 210                                                     *mykeydata;
 211         struct winreg_OpenKey r;
 212         NTSTATUS status;
 213
 214         mykeydata = talloc_zero(mem_ctx, struct rpc_key);
 215         mykeydata->key.context = parentkeydata->key.context;
 216         mykeydata->pipe = talloc_reference(mykeydata, parentkeydata->pipe);
 217         mykeydata->num_values = -1;
 218         mykeydata->num_subkeys = -1;
 219         *key = (struct registry_key *)mykeydata;
 220
 221         /* Then, open the handle using the hive */
 222         ZERO_STRUCT(r);
 223         r.in.parent_handle = &parentkeydata->pol;
 224         chars_to_winreg_String(mem_ctx, &r.in.keyname, name);
 225         r.in.unknown = 0x00000000;
 226         r.in.access_mask = 0x02000000;
 227         r.out.handle = &mykeydata->pol;
 228
 229         status = dcerpc_winreg_OpenKey(mykeydata->pipe, mem_ctx, &r);
 230
 231         if (!NT_STATUS_IS_OK(status)) {
 232                 DEBUG(1, ("OpenKey failed - %s\n", nt_errstr(status)));
 233                 return ntstatus_to_werror(status);
 234         }
 235
 236         return r.out.result;
 237 }
 238
 239 static WERROR rpc_get_value_by_index(TALLOC_CTX *mem_ctx,
 240                                      const struct registry_key *parent,
 241                                      uint32_t n,
 242                                      const char **value_name,
 243                                      uint32_t *type,
 244                                      DATA_BLOB *data)
 245 {
 246         struct rpc_key *mykeydata = talloc_get_type(parent, struct rpc_key);
 247         struct winreg_EnumValue r;
 248         struct winreg_StringBuf name;
 249         uint8_t value;
 250         uint32_t val_size = MAX_VALSIZE;
 251         uint32_t zero = 0;
 252         WERROR error;
 253         NTSTATUS status;
 254
 255         if (mykeydata->num_values == -1) {
 256                 error = rpc_query_key(mem_ctx, parent);
 257                 if(!W_ERROR_IS_OK(error)) return error;
 258         }
 259
 260         chars_to_winreg_StringBuf(mem_ctx, &name, "", MAX_NAMESIZE);
 261
 262         ZERO_STRUCT(r);
 263         r.in.handle = &mykeydata->pol;
 264         r.in.enum_index = n;
 265         r.in.name = &name;
 266         r.in.type = type;
 267         r.in.value = &value;
 268         r.in.size = &val_size;
 269         r.in.length = &zero;
 270         r.out.name = &name;
 271         r.out.type = type;
 272         r.out.value = &value;
 273         r.out.size = &val_size;
 274         r.out.length = &zero;
 275
 276         status = dcerpc_winreg_EnumValue(mykeydata->pipe, mem_ctx, &r);
 277
 278         if (!NT_STATUS_IS_OK(status)) {
 279                 DEBUG(1, ("EnumValue failed - %s\n", nt_errstr(status)));
 280                 return ntstatus_to_werror(status);
 281         }
 282
 283         winreg_StringBuf_to_chars(mem_ctx, value_name, r.out.name);
 284         *type = *(r.out.type);
 285         *data = data_blob_talloc(mem_ctx, r.out.value, *r.out.length);
 286
 287         return r.out.result;
 288 }
 289
 290 static WERROR rpc_get_subkey_by_index(TALLOC_CTX *mem_ctx,
 291                                       const struct registry_key *parent,
 292                                       uint32_t n,
 293                                       const char **name,
 294                                       const char **keyclass,
 295                                       NTTIME *last_changed_time)
 296 {
 297         struct winreg_EnumKey r;
 298         struct rpc_key *mykeydata = talloc_get_type(parent, struct rpc_key);
 299         struct winreg_StringBuf namebuf, classbuf;
 300         NTTIME change_time = 0;
 301         NTSTATUS status;
 302
 303         chars_to_winreg_StringBuf(mem_ctx, &namebuf, " ", MAX_NAMESIZE);
 304         chars_to_winreg_StringBuf(mem_ctx, &classbuf, NULL, 0);
 305
 306         ZERO_STRUCT(r);
 307         r.in.handle = &mykeydata->pol;
 308         r.in.enum_index = n;
 309         r.in.name = &namebuf;
 310         r.in.keyclass = &classbuf;
 311         r.in.last_changed_time = &change_time;
 312         r.out.name = &namebuf;
 313         r.out.keyclass = &classbuf;
 314         r.out.last_changed_time = &change_time;
 315
 316         status = dcerpc_winreg_EnumKey(mykeydata->pipe, mem_ctx, &r);
 317
 318         if (!NT_STATUS_IS_OK(status)) {
 319                 DEBUG(1, ("EnumKey failed - %s\n", nt_errstr(status)));
 320                 return ntstatus_to_werror(status);
 321         }
 322
 323         if (name != NULL)
 324                 winreg_StringBuf_to_chars(mem_ctx, name, r.out.name);
 325         if (keyclass != NULL)
 326                 winreg_StringBuf_to_chars(mem_ctx, keyclass, r.out.keyclass);
 327         if (last_changed_time != NULL)
 328                 *last_changed_time = *(r.out.last_changed_time);
 329
 330         return r.out.result;
 331 }
 332
 333 static WERROR rpc_add_key(TALLOC_CTX *mem_ctx,
 334                           struct registry_key *parent, const char *name,
 335                           const char *key_class,
 336                           struct security_descriptor *sec,
 337                           struct registry_key **key)
 338 {
 339         struct winreg_CreateKey r;
 340         struct rpc_key *parentkd = talloc_get_type(parent, struct rpc_key);
 341         struct rpc_key *rpck = talloc(mem_ctx, struct rpc_key);
 342
 343         NTSTATUS status;
 344
 345         ZERO_STRUCT(r);
 346         r.in.handle = &parentkd->pol;
 347         chars_to_winreg_String(mem_ctx, &r.in.name, name);
 348         chars_to_winreg_String(mem_ctx, &r.in.keyclass, NULL);
 349         r.in.options = 0;
 350         r.in.access_mask = 0x02000000;
 351         r.in.secdesc = NULL;
 352         r.in.action_taken = NULL;
 353         r.out.new_handle = &rpck->pol;
 354         r.out.action_taken = NULL;
 355
 356         status = dcerpc_winreg_CreateKey(parentkd->pipe, mem_ctx, &r);
 357
 358         if (!NT_STATUS_IS_OK(status)) {
 359                 talloc_free(rpck);
 360                 DEBUG(1, ("CreateKey failed - %s\n", nt_errstr(status)));
 361                 return ntstatus_to_werror(status);
 362         }
 363
 364         rpck->pipe = talloc_reference(rpck, parentkd->pipe);
 365         *key = (struct registry_key *)rpck;
 366
 367         return r.out.result;
 368 }
 369
 370 static WERROR rpc_query_key(TALLOC_CTX *mem_ctx, const struct registry_key *k)
 371 {
 372         struct winreg_QueryInfoKey r;
 373         struct rpc_key *mykeydata = talloc_get_type(k, struct rpc_key);
 374         struct winreg_String classname;
 375         NTSTATUS status;
 376
 377         chars_to_winreg_String(mem_ctx, &classname, NULL);
 378
 379         ZERO_STRUCT(r);
 380         r.in.handle = &mykeydata->pol;
 381         r.in.classname = &classname;
 382         r.out.classname = &classname;
 383         r.out.num_subkeys = &mykeydata->num_subkeys;
 384         r.out.max_subkeylen = &mykeydata->max_subkeylen;
 385         r.out.max_subkeysize = &mykeydata->max_subkeysize;
 386         r.out.num_values = &mykeydata->num_values;
 387         r.out.max_valnamelen = &mykeydata->max_valnamelen;
 388         r.out.max_valbufsize = &mykeydata->max_valbufsize;
 389         r.out.secdescsize = &mykeydata->secdescsize;
 390         r.out.last_changed_time = &mykeydata->last_changed_time;
 391
 392         status = dcerpc_winreg_QueryInfoKey(mykeydata->pipe, mem_ctx, &r);
 393
 394         if (!NT_STATUS_IS_OK(status)) {
 395                 DEBUG(1, ("QueryInfoKey failed - %s\n", nt_errstr(status)));
 396                 return ntstatus_to_werror(status);
 397         }
 398
 399         winreg_String_to_chars(mem_ctx, &mykeydata->classname, r.out.classname);
 400
 401         return r.out.result;
 402 }
 403
 404 static WERROR rpc_del_key(struct registry_key *parent, const char *name)
 405 {
 406         NTSTATUS status;
 407         struct rpc_key *mykeydata = talloc_get_type(parent, struct rpc_key);
 408         struct winreg_DeleteKey r;
 409         TALLOC_CTX *mem_ctx = talloc_init("del_key");
 410
 411         ZERO_STRUCT(r);
 412         r.in.handle = &mykeydata->pol;
 413         chars_to_winreg_String(mem_ctx, &r.in.key, name);
 414
 415         status = dcerpc_winreg_DeleteKey(mykeydata->pipe, mem_ctx, &r);
 416
 417         talloc_free(mem_ctx);
 418
 419         if (!NT_STATUS_IS_OK(status)) {
 420                 DEBUG(1, ("DeleteKey failed - %s\n", nt_errstr(status)));
 421                 return ntstatus_to_werror(status);
 422         }
 423
 424         return r.out.result;
 425 }
 426
 427 static WERROR rpc_get_info(TALLOC_CTX *mem_ctx, const struct registry_key *key,
 428                                                    const char **classname,
 429                                                    uint32_t *num_subkeys,
 430                                                    uint32_t *num_values,
 431                                                    NTTIME *last_changed_time,
 432                                                    uint32_t *max_subkeylen,
 433                                                    uint32_t *max_valnamelen,
 434                                                    uint32_t *max_valbufsize)
 435 {
 436         struct rpc_key *mykeydata = talloc_get_type(key, struct rpc_key);
 437         WERROR error;
 438
 439         if (mykeydata->num_values == -1) {
 440                 error = rpc_query_key(mem_ctx, key);
 441                 if(!W_ERROR_IS_OK(error)) return error;
 442         }
 443
 444         if (classname != NULL)
 445                 *classname = mykeydata->classname;
 446
 447         if (num_subkeys != NULL)
 448                 *num_subkeys = mykeydata->num_subkeys;
 449
 450         if (num_values != NULL)
 451                 *num_values = mykeydata->num_values;
 452
 453         if (last_changed_time != NULL)
 454                 *last_changed_time = mykeydata->last_changed_time;
 455
 456         if (max_subkeylen != NULL)
 457                 *max_subkeylen = mykeydata->max_subkeylen;
 458
 459         if (max_valnamelen != NULL)
 460                 *max_valnamelen = mykeydata->max_valnamelen;
 461
 462         if (max_valbufsize != NULL)
 463                 *max_valbufsize = mykeydata->max_valbufsize;
 464
 465         return WERR_OK;
 466 }
 467
 468 static struct registry_operations reg_backend_rpc = {
 469         .name = "rpc",
 470         .open_key = rpc_open_key,
 471         .get_predefined_key = rpc_get_predefined_key,
 472         .enum_key = rpc_get_subkey_by_index,
 473         .enum_value = rpc_get_value_by_index,
 474         .create_key = rpc_add_key,
 475         .delete_key = rpc_del_key,
 476         .get_key_info = rpc_get_info,
 477         .get_predefined_key = rpc_get_predefined_key,
 478 };
 479
 480 _PUBLIC_ WERROR reg_open_remote(struct registry_context **ctx,
 481                                 struct auth_session_info *session_info,
 482                                 struct cli_credentials *credentials,
 483                                 struct loadparm_context *lp_ctx,
 484                                 const char *location, struct event_context *ev)
 485 {
 486         NTSTATUS status;
 487         struct dcerpc_pipe *p;
 488         struct rpc_registry_context *rctx;
 489
 490         dcerpc_init();
 491
 492         rctx = talloc(NULL, struct rpc_registry_context);
 493
 494         /* Default to local smbd if no connection is specified */
 495         if (!location) {
 496                 location = talloc_strdup(rctx, "ncalrpc:");
 497         }
 498
 499         status = dcerpc_pipe_connect(rctx /* TALLOC_CTX */,
 500                                      &p, location,
 501                                          &ndr_table_winreg,
 502                                      credentials, ev, lp_ctx);
 503         rctx->pipe = p;
 504
 505         if(NT_STATUS_IS_ERR(status)) {
 506                 DEBUG(1, ("Unable to open '%s': %s\n", location,
 507                         nt_errstr(status)));
 508                 talloc_free(rctx);
 509                 *ctx = NULL;
 510                 return ntstatus_to_werror(status);
 511         }
 512
 513         *ctx = (struct registry_context *)rctx;
 514         (*ctx)->ops = &reg_backend_rpc;
 515
 516         return WERR_OK;
 517 }