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_EXPAND_SZ:
  73                 case REG_SZ:
  74                         if (data.length % 2 == 0) {
  75                                 convert_string_talloc_convenience(mem_ctx,
  76                                                                   iconv_convenience,
  77                                                                   CH_UTF16, CH_UNIX,
  78                                                                   data.data,
  79                                                                   data.length,
  80                                                                   (void **)&ret,
  81                                                                   NULL, false);
  82                         }
  83                         break;
  84                 case REG_BINARY:
  85                         ret = data_blob_hex_string_upper(mem_ctx, &data);
  86                         break;
  87                 case REG_DWORD:
  88                         if (data.length == sizeof(uint32_t)) {
  89                                 if (IVAL(data.data, 0) == 0) {
  90                                         ret = talloc_strdup(mem_ctx, "0");
  91                                 } else {
  92                                         ret = talloc_asprintf(mem_ctx, "0x%x",
  93                                                               IVAL(data.data, 0));
  94                                 }
  95                         }
  96                         break;
  97                 case REG_QWORD:
  98                         if (data.length == sizeof(uint64_t)) {
  99                                 if (BVAL(data.data, 0) == 0) {
 100                                         ret = talloc_strdup(mem_ctx, "0");
 101                                 } else {
 102                                         ret = talloc_asprintf(mem_ctx, "0x%llx",
 103                                                               BVAL(data.data, 0));
 104                                 }
 105                         }
 106                         break;
 107                 case REG_NONE:
 108                         /* "NULL" is the right return value */
 109                         break;
 110                 case REG_MULTI_SZ:
 111                         /* FIXME: We don't support this yet */
 112                         break;
 113                 default:
 114                         /* FIXME */
 115                         /* Other datatypes aren't supported -> return "NULL" */
 116                         break;
 117         }
 118
 119         return ret;
 120 }
 121
 122 /** Generate a string that describes a registry value */
 123 _PUBLIC_ char *reg_val_description(TALLOC_CTX *mem_ctx,
 124                                    struct smb_iconv_convenience *iconv_convenience,
 125                                    const char *name,
 126                                    uint32_t data_type,
 127                                    const DATA_BLOB data)
 128 {
 129         return talloc_asprintf(mem_ctx, "%s = %s : %s", name?name:"<No Name>",
 130                                str_regtype(data_type),
 131                                reg_val_data_string(mem_ctx, iconv_convenience, data_type, data));
 132 }
 133
 134 _PUBLIC_ bool reg_string_to_val(TALLOC_CTX *mem_ctx,
 135                                 struct smb_iconv_convenience *iconv_convenience,
 136                                 const char *type_str,
 137                                 const char *data_str, uint32_t *type,
 138                                 DATA_BLOB *data)
 139 {
 140         unsigned int i;
 141         *type = -1;
 142
 143         /* Find the correct type */
 144         for (i = 0; reg_value_types[i].name; i++) {
 145                 if (!strcmp(reg_value_types[i].name, type_str)) {
 146                         *type = reg_value_types[i].id;
 147                         break;
 148                 }
 149         }
 150
 151         if (*type == -1)
 152                 return false;
 153
 154         /* Convert data appropriately */
 155
 156         switch (*type) {
 157                 case REG_SZ:
 158                 case REG_EXPAND_SZ:
 159                         convert_string_talloc_convenience(mem_ctx,
 160                                                           iconv_convenience,
 161                                                           CH_UNIX, CH_UTF16,
 162                                                           data_str,
 163                                                           strlen(data_str)+1,
 164                                                           (void **)&data->data,
 165                                                           &data->length, false);
 166                         break;
 167                 case REG_BINARY:
 168                         *data = strhex_to_data_blob(mem_ctx, data_str);
 169                         break;
 170                 case REG_DWORD: {
 171                         uint32_t tmp = strtol(data_str, NULL, 0);
 172                         *data = data_blob_talloc(mem_ctx, NULL, sizeof(uint32_t));
 173                         SIVAL(data->data, 0, tmp);
 174                         }
 175                         break;
 176                 case REG_QWORD: {
 177                         uint64_t tmp = strtoll(data_str, NULL, 0);
 178                         *data = data_blob_talloc(mem_ctx, NULL, sizeof(uint64_t));
 179                         SBVAL(data->data, 0, tmp);
 180                         }
 181                         break;
 182                 case REG_NONE:
 183                         ZERO_STRUCTP(data);
 184                         break;
 185                 case REG_MULTI_SZ:
 186                         /* FIXME: We don't support this yet */
 187                         return false;
 188                 default:
 189                         /* FIXME */
 190                         /* Other datatypes aren't supported -> return no success */
 191                         return false;
 192         }
 193         return true;
 194 }
 195
 196 /** Open a key by name (including the predefined key name!) */
 197 WERROR reg_open_key_abs(TALLOC_CTX *mem_ctx, struct registry_context *handle,
 198                         const char *name, struct registry_key **result)
 199 {
 200         struct registry_key *predef;
 201         WERROR error;
 202         size_t predeflength;
 203         char *predefname;
 204
 205         if (strchr(name, '\\') != NULL)
 206                 predeflength = strchr(name, '\\')-name;
 207         else
 208                 predeflength = strlen(name);
 209
 210         predefname = talloc_strndup(mem_ctx, name, predeflength);
 211         error = reg_get_predefined_key_by_name(handle, predefname, &predef);
 212         talloc_free(predefname);
 213
 214         if (!W_ERROR_IS_OK(error)) {
 215                 return error;
 216         }
 217
 218         if (strchr(name, '\\')) {
 219                 return reg_open_key(mem_ctx, predef, strchr(name, '\\')+1,
 220                                     result);
 221         } else {
 222                 *result = predef;
 223                 return WERR_OK;
 224         }
 225 }
 226
 227 static WERROR get_abs_parent(TALLOC_CTX *mem_ctx, struct registry_context *ctx,
 228                              const char *path, struct registry_key **parent,
 229                              const char **name)
 230 {
 231         char *parent_name;
 232         WERROR error;
 233
 234         if (strchr(path, '\\') == NULL) {
 235                 return WERR_FOOBAR;
 236         }
 237
 238         parent_name = talloc_strndup(mem_ctx, path, strrchr(path, '\\')-path);
 239
 240         error = reg_open_key_abs(mem_ctx, ctx, parent_name, parent);
 241         if (!W_ERROR_IS_OK(error)) {
 242                 return error;
 243         }
 244
 245         *name = talloc_strdup(mem_ctx, strrchr(path, '\\')+1);
 246
 247         return WERR_OK;
 248 }
 249
 250 WERROR reg_key_del_abs(struct registry_context *ctx, const char *path)
 251 {
 252         struct registry_key *parent;
 253         const char *n;
 254         TALLOC_CTX *mem_ctx = talloc_init("reg_key_del_abs");
 255         WERROR error;
 256
 257         if (!strchr(path, '\\')) {
 258                 return WERR_FOOBAR;
 259         }
 260
 261         error = get_abs_parent(mem_ctx, ctx, path, &parent, &n);
 262         if (W_ERROR_IS_OK(error)) {
 263                 error = reg_key_del(parent, n);
 264         }
 265
 266         talloc_free(mem_ctx);
 267
 268         return error;
 269 }
 270
 271 WERROR reg_key_add_abs(TALLOC_CTX *mem_ctx, struct registry_context *ctx,
 272                        const char *path, uint32_t access_mask,
 273                        struct security_descriptor *sec_desc,
 274                        struct registry_key **result)
 275 {
 276         struct registry_key *parent;
 277         const char *n;
 278         WERROR error;
 279
 280         if (!strchr(path, '\\')) {
 281                 return WERR_ALREADY_EXISTS;
 282         }
 283
 284         error = get_abs_parent(mem_ctx, ctx, path, &parent, &n);
 285         if (!W_ERROR_IS_OK(error)) {
 286                 DEBUG(2, ("Opening parent of %s failed with %s\n", path,
 287                                   win_errstr(error)));
 288                 return error;
 289         }
 290
 291         error = reg_key_add_name(mem_ctx, parent, n, NULL, sec_desc, result);
 292
 293         return error;
 294 }