source4/lib/registry/util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Transparent registry backend handling
   4    Copyright (C) Jelmer Vernooij                        2003-2007.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "lib/registry/registry.h"
  22 #include "librpc/gen_ndr/winreg.h"
  23
  24 /**
  25  * @file
  26  * @brief Registry utility functions
  27  */
  28
  29 static const struct {
  30         uint32_t id;
  31         const char *name;
  32 } reg_value_types[] = {
  33         { REG_NONE, "REG_NONE" },
  34         { REG_SZ, "REG_SZ" },
  35         { REG_EXPAND_SZ, "REG_EXPAND_SZ" },
  36         { REG_BINARY, "REG_BINARY" },
  37         { REG_DWORD, "REG_DWORD" },
  38         { REG_DWORD_BIG_ENDIAN, "REG_DWORD_BIG_ENDIAN" },
  39         { REG_LINK, "REG_LINK" },
  40         { REG_MULTI_SZ, "REG_MULTI_SZ" },
  41         { REG_RESOURCE_LIST, "REG_RESOURCE_LIST" },
  42         { REG_FULL_RESOURCE_DESCRIPTOR, "REG_FULL_RESOURCE_DESCRIPTOR" },
  43         { REG_RESOURCE_REQUIREMENTS_LIST, "REG_RESOURCE_REQUIREMENTS_LIST" },
  44         { REG_QWORD, "REG_QWORD" },
  45
  46         { 0, NULL }
  47 };
  48
  49 /** Return string description of registry value type */
  50 _PUBLIC_ const char *str_regtype(int type)
  51 {
  52         unsigned int i;
  53         for (i = 0; reg_value_types[i].name; i++) {
  54                 if (reg_value_types[i].id == type)
  55                         return reg_value_types[i].name;
  56         }
  57
  58         return "Unknown";
  59 }
  60
  61 _PUBLIC_ char *reg_val_data_string(TALLOC_CTX *mem_ctx,
  62                                    struct smb_iconv_convenience *iconv_convenience,
  63                                    uint32_t type,
  64                                    const DATA_BLOB data)
  65 {
  66         char *ret = NULL;
  67
  68         if (data.length == 0)
  69                 return talloc_strdup(mem_ctx, "");
  70
  71         switch (type) {
  72                 case REG_NONE:
  73                         /* "NULL" is the right return value */
  74                         break;
  75                 case REG_EXPAND_SZ:
  76                 case REG_SZ:
  77                         if (data.length % 2 == 0) {
  78                                 convert_string_talloc_convenience(mem_ctx,
  79                                                                   iconv_convenience,
  80                                                                   CH_UTF16, CH_UNIX,
  81                                                                   data.data,
  82                                                                   data.length,
  83                                                                   (void **)&ret,
  84                                                                   NULL, false);
  85                         }
  86                         break;
  87                 case REG_DWORD:
  88                 case REG_DWORD_BIG_ENDIAN:
  89                         if (data.length == sizeof(uint32_t)) {
  90                                 ret = talloc_asprintf(mem_ctx, "0x%8.8x",
  91                                                       IVAL(data.data, 0));
  92                         }
  93                         break;
  94                 case REG_QWORD:
  95                         if (data.length == sizeof(uint64_t)) {
  96                                 ret = talloc_asprintf(mem_ctx, "0x%16.16llx",
  97                                                       BVAL(data.data, 0));
  98                         }
  99                         break;
 100                 case REG_BINARY:
 101                 default:
 102                         ret = data_blob_hex_string_upper(mem_ctx, &data);
 103                         break;
 104         }
 105
 106         return ret;
 107 }
 108
 109 /** Generate a string that describes a registry value */
 110 _PUBLIC_ char *reg_val_description(TALLOC_CTX *mem_ctx,
 111                                    struct smb_iconv_convenience *iconv_convenience,
 112                                    const char *name,
 113                                    uint32_t data_type,
 114                                    const DATA_BLOB data)
 115 {
 116         return talloc_asprintf(mem_ctx, "%s = %s : %s", name?name:"<No Name>",
 117                                str_regtype(data_type),
 118                                reg_val_data_string(mem_ctx, iconv_convenience, data_type, data));
 119 }
 120
 121 _PUBLIC_ bool reg_string_to_val(TALLOC_CTX *mem_ctx,
 122                                 struct smb_iconv_convenience *iconv_convenience,
 123                                 const char *type_str,
 124                                 const char *data_str, uint32_t *type,
 125                                 DATA_BLOB *data)
 126 {
 127         unsigned int i;
 128         *type = -1;
 129
 130         /* Find the correct type */
 131         for (i = 0; reg_value_types[i].name; i++) {
 132                 if (!strcmp(reg_value_types[i].name, type_str)) {
 133                         *type = reg_value_types[i].id;
 134                         break;
 135                 }
 136         }
 137
 138         if (*type == -1)
 139                 return false;
 140
 141         /* Convert data appropriately */
 142
 143         switch (*type) {
 144                 case REG_NONE:
 145                         ZERO_STRUCTP(data);
 146                         break;
 147                 case REG_SZ:
 148                 case REG_EXPAND_SZ:
 149                         return convert_string_talloc_convenience(mem_ctx,
 150                                                                  iconv_convenience,
 151                                                                  CH_UNIX, CH_UTF16,
 152                                                                  data_str,
 153                                                                  strlen(data_str)+1,
 154                                                                  (void **)&data->data,
 155                                                                  &data->length, false);
 156                         break;
 157                 case REG_DWORD:
 158                 case REG_DWORD_BIG_ENDIAN: {
 159                         uint32_t tmp = strtol(data_str, NULL, 0);
 160                         *data = data_blob_talloc(mem_ctx, NULL, sizeof(uint32_t));
 161                         if (data->data == NULL) return false;
 162                         SIVAL(data->data, 0, tmp);
 163                         }
 164                         break;
 165                 case REG_QWORD: {
 166                         uint64_t tmp = strtoll(data_str, NULL, 0);
 167                         *data = data_blob_talloc(mem_ctx, NULL, sizeof(uint64_t));
 168                         if (data->data == NULL) return false;
 169                         SBVAL(data->data, 0, tmp);
 170                         }
 171                         break;
 172                 case REG_BINARY:
 173                 default:
 174                         *data = strhex_to_data_blob(mem_ctx, data_str);
 175                         break;
 176         }
 177         return true;
 178 }
 179
 180 /** Open a key by name (including the predefined key name!) */
 181 WERROR reg_open_key_abs(TALLOC_CTX *mem_ctx, struct registry_context *handle,
 182                         const char *name, struct registry_key **result)
 183 {
 184         struct registry_key *predef;
 185         WERROR error;
 186         size_t predeflength;
 187         char *predefname;
 188
 189         if (strchr(name, '\\') != NULL)
 190                 predeflength = strchr(name, '\\')-name;
 191         else
 192                 predeflength = strlen(name);
 193
 194         predefname = talloc_strndup(mem_ctx, name, predeflength);
 195         W_ERROR_HAVE_NO_MEMORY(predefname);
 196         error = reg_get_predefined_key_by_name(handle, predefname, &predef);
 197         talloc_free(predefname);
 198
 199         if (!W_ERROR_IS_OK(error)) {
 200                 return error;
 201         }
 202
 203         if (strchr(name, '\\')) {
 204                 return reg_open_key(mem_ctx, predef, strchr(name, '\\')+1,
 205                                     result);
 206         } else {
 207                 *result = predef;
 208                 return WERR_OK;
 209         }
 210 }
 211
 212 static WERROR get_abs_parent(TALLOC_CTX *mem_ctx, struct registry_context *ctx,
 213                              const char *path, struct registry_key **parent,
 214                              const char **name)
 215 {
 216         char *parent_name;
 217         WERROR error;
 218
 219         if (strchr(path, '\\') == NULL) {
 220                 return WERR_FOOBAR;
 221         }
 222
 223         parent_name = talloc_strndup(mem_ctx, path, strrchr(path, '\\')-path);
 224         W_ERROR_HAVE_NO_MEMORY(parent_name);
 225         error = reg_open_key_abs(mem_ctx, ctx, parent_name, parent);
 226         talloc_free(parent_name);
 227         if (!W_ERROR_IS_OK(error)) {
 228                 return error;
 229         }
 230
 231         *name = talloc_strdup(mem_ctx, strrchr(path, '\\')+1);
 232         W_ERROR_HAVE_NO_MEMORY(*name);
 233
 234         return WERR_OK;
 235 }
 236
 237 WERROR reg_key_del_abs(TALLOC_CTX *mem_ctx, struct registry_context *ctx,
 238                        const char *path)
 239 {
 240         struct registry_key *parent;
 241         char *n;
 242         WERROR error;
 243
 244         if (!strchr(path, '\\')) {
 245                 return WERR_FOOBAR;
 246         }
 247
 248         error = get_abs_parent(mem_ctx, ctx, path, &parent, &n);
 249         if (W_ERROR_IS_OK(error)) {
 250                 error = reg_key_del(mem_ctx, parent, n);
 251
 252                 talloc_free(parent);
 253                 talloc_free(n);
 254         }
 255
 256         return error;
 257 }
 258
 259 WERROR reg_key_add_abs(TALLOC_CTX *mem_ctx, struct registry_context *ctx,
 260                        const char *path, uint32_t access_mask,
 261                        struct security_descriptor *sec_desc,
 262                        struct registry_key **result)
 263 {
 264         struct registry_key *parent;
 265         char *n;
 266         WERROR error;
 267
 268         *result = NULL;
 269
 270         if (!strchr(path, '\\')) {
 271                 return WERR_ALREADY_EXISTS;
 272         }
 273
 274         error = get_abs_parent(mem_ctx, ctx, path, &parent, &n);
 275         if (!W_ERROR_IS_OK(error)) {
 276                 DEBUG(2, ("Opening parent of %s failed with %s\n", path,
 277                                   win_errstr(error)));
 278                 return error;
 279         }
 280
 281         error = reg_key_add_name(mem_ctx, parent, n, NULL, sec_desc, result);
 282
 283         talloc_free(parent);
 284         talloc_free(n);
 285
 286         return error;
 287 }