source4/lib/registry/util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Transparent registry backend handling
   4    Copyright (C) Jelmer Vernooij                        2003-2007.
   5    Copyright (C) Wilco Baan Hofman                      2010.
   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
  21 #include "includes.h"
  22 #include "lib/registry/registry.h"
  23 #include "librpc/gen_ndr/winreg.h"
  24 #include "lib/util/data_blob.h"
  25
  26 _PUBLIC_ char *reg_val_data_string(TALLOC_CTX *mem_ctx, uint32_t type,
  27                                    const DATA_BLOB data)
  28 {
  29         size_t converted_size = 0;
  30         char *ret = NULL;
  31
  32         if (data.length == 0)
  33                 return talloc_strdup(mem_ctx, "");
  34
  35         switch (type) {
  36                 case REG_EXPAND_SZ:
  37                 case REG_SZ:
  38                         convert_string_talloc(mem_ctx,
  39                                               CH_UTF16, CH_UNIX,
  40                                               data.data, data.length,
  41                                               (void **)&ret, &converted_size);
  42                         break;
  43                 case REG_DWORD:
  44                 case REG_DWORD_BIG_ENDIAN:
  45                         SMB_ASSERT(data.length == sizeof(uint32_t));
  46                         ret = talloc_asprintf(mem_ctx, "0x%8.8x",
  47                                               IVAL(data.data, 0));
  48                         break;
  49                 case REG_QWORD:
  50                         SMB_ASSERT(data.length == sizeof(uint64_t));
  51                         ret = talloc_asprintf(mem_ctx, "0x%16.16llx",
  52                                               (long long)BVAL(data.data, 0));
  53                         break;
  54                 case REG_BINARY:
  55                         ret = data_blob_hex_string_upper(mem_ctx, &data);
  56                         break;
  57                 case REG_NONE:
  58                         /* "NULL" is the right return value */
  59                         break;
  60                 case REG_MULTI_SZ:
  61                         /* FIXME: We don't support this yet */
  62                         break;
  63                 default:
  64                         /* FIXME */
  65                         /* Other datatypes aren't supported -> return "NULL" */
  66                         break;
  67         }
  68
  69         return ret;
  70 }
  71
  72 /** Generate a string that describes a registry value */
  73 _PUBLIC_ char *reg_val_description(TALLOC_CTX *mem_ctx,
  74                                    const char *name,
  75                                    uint32_t data_type,
  76                                    const DATA_BLOB data)
  77 {
  78         return talloc_asprintf(mem_ctx, "%s = %s : %s", name?name:"<No Name>",
  79                                str_regtype(data_type),
  80                                reg_val_data_string(mem_ctx, data_type, data));
  81 }
  82
  83 /*
  84  * This implements reading hex bytes that include comma's.
  85  * It was previously handled by strhex_to_data_blob, but that did not cover
  86  * the format used by windows.
  87  */
  88 static DATA_BLOB reg_strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *str)
  89 {
  90         DATA_BLOB ret;
  91         const char *HEXCHARS = "0123456789ABCDEF";
  92         size_t i, j;
  93         char *hi, *lo;
  94
  95         ret = data_blob_talloc_zero(mem_ctx, (strlen(str)+(strlen(str) % 3))/3);
  96         j = 0;
  97         for (i = 0; i < strlen(str); i++) {
  98                 hi = strchr(HEXCHARS, toupper(str[i]));
  99                 if (hi == NULL)
 100                         continue;
 101
 102                 i++;
 103                 lo = strchr(HEXCHARS, toupper(str[i]));
 104                 if (lo == NULL)
 105                         break;
 106
 107                 ret.data[j] = PTR_DIFF(hi, HEXCHARS) << 4;
 108                 ret.data[j] += PTR_DIFF(lo, HEXCHARS);
 109                 j++;
 110
 111                 if (j > ret.length) {
 112                         DEBUG(0, ("Trouble converting hex string to bin\n"));
 113                         break;
 114                 }
 115         }
 116         return ret;
 117 }
 118
 119
 120 _PUBLIC_ bool reg_string_to_val(TALLOC_CTX *mem_ctx, const char *type_str,
 121                                 const char *data_str, uint32_t *type, DATA_BLOB *data)
 122 {
 123         char *tmp_type_str, *p, *q;
 124         int result;
 125
 126         *type = regtype_by_string(type_str);
 127
 128         if (*type == -1) {
 129                 /* Normal windows format is hex, hex(type int as string),
 130                    dword or just a string. */
 131                 if (strncmp(type_str, "hex(", 4) == 0) {
 132                         /* there is a hex string with the value type between
 133                            the braces */
 134                         tmp_type_str = talloc_strdup(mem_ctx, type_str);
 135                         q = p = tmp_type_str + strlen("hex(");
 136
 137                         /* Go to the closing brace or end of the string */
 138                         while (*q != ')' && *q != '\0') q++;
 139                         *q = '\0';
 140
 141                         /* Convert hex string to int, store it in type */
 142                         result = sscanf(p, "%x", type);
 143                         if (!result) {
 144                                 DEBUG(0, ("Could not convert hex to int\n"));
 145                                 return false;
 146                         }
 147                         talloc_free(tmp_type_str);
 148                 } else if (strcmp(type_str, "hex") == 0) {
 149                         *type = REG_BINARY;
 150                 } else if (strcmp(type_str, "dword") == 0) {
 151                         *type = REG_DWORD;
 152                 }
 153         }
 154
 155         if (*type == -1)
 156                 return false;
 157
 158         /* Convert data appropriately */
 159
 160         switch (*type) {
 161                 case REG_SZ:
 162                         return convert_string_talloc(mem_ctx,
 163                                                      CH_UNIX, CH_UTF16,
 164                                                      data_str, strlen(data_str)+1,
 165                                                      (void **)&data->data,
 166                                                      &data->length);
 167                         break;
 168                 case REG_MULTI_SZ:
 169                 case REG_EXPAND_SZ:
 170                 case REG_BINARY:
 171                         *data = reg_strhex_to_data_blob(mem_ctx, data_str);
 172                         break;
 173                 case REG_DWORD:
 174                 case REG_DWORD_BIG_ENDIAN: {
 175                         uint32_t tmp = strtol(data_str, NULL, 16);
 176                         *data = data_blob_talloc(mem_ctx, NULL, sizeof(uint32_t));
 177                         if (data->data == NULL) return false;
 178                         SIVAL(data->data, 0, tmp);
 179                         }
 180                         break;
 181                 case REG_QWORD: {
 182                         uint64_t tmp = strtoll(data_str, NULL, 16);
 183                         *data = data_blob_talloc(mem_ctx, NULL, sizeof(uint64_t));
 184                         if (data->data == NULL) return false;
 185                         SBVAL(data->data, 0, tmp);
 186                         }
 187                         break;
 188                 case REG_NONE:
 189                         ZERO_STRUCTP(data);
 190                         break;
 191                 default:
 192                         /* FIXME */
 193                         /* Other datatypes aren't supported -> return no success */
 194                         return false;
 195         }
 196         return true;
 197 }
 198
 199 /** Open a key by name (including the predefined key name!) */
 200 WERROR reg_open_key_abs(TALLOC_CTX *mem_ctx, struct registry_context *handle,
 201                         const char *name, struct registry_key **result)
 202 {
 203         struct registry_key *predef;
 204         WERROR error;
 205         size_t predeflength;
 206         char *predefname;
 207
 208         if (strchr(name, '\\') != NULL)
 209                 predeflength = strchr(name, '\\')-name;
 210         else
 211                 predeflength = strlen(name);
 212
 213         predefname = talloc_strndup(mem_ctx, name, predeflength);
 214         W_ERROR_HAVE_NO_MEMORY(predefname);
 215         error = reg_get_predefined_key_by_name(handle, predefname, &predef);
 216         talloc_free(predefname);
 217
 218         if (!W_ERROR_IS_OK(error)) {
 219                 return error;
 220         }
 221
 222         if (strchr(name, '\\')) {
 223                 return reg_open_key(mem_ctx, predef, strchr(name, '\\')+1,
 224                                     result);
 225         } else {
 226                 *result = predef;
 227                 return WERR_OK;
 228         }
 229 }
 230
 231 static WERROR get_abs_parent(TALLOC_CTX *mem_ctx, struct registry_context *ctx,
 232                              const char *path, struct registry_key **parent,
 233                              const char **name)
 234 {
 235         char *parent_name;
 236         WERROR error;
 237
 238         if (strchr(path, '\\') == NULL) {
 239                 return WERR_FOOBAR;
 240         }
 241
 242         parent_name = talloc_strndup(mem_ctx, path, strrchr(path, '\\')-path);
 243         W_ERROR_HAVE_NO_MEMORY(parent_name);
 244         error = reg_open_key_abs(mem_ctx, ctx, parent_name, parent);
 245         talloc_free(parent_name);
 246         if (!W_ERROR_IS_OK(error)) {
 247                 return error;
 248         }
 249
 250         *name = talloc_strdup(mem_ctx, strrchr(path, '\\')+1);
 251         W_ERROR_HAVE_NO_MEMORY(*name);
 252
 253         return WERR_OK;
 254 }
 255
 256 WERROR reg_key_del_abs(struct registry_context *ctx, const char *path)
 257 {
 258         struct registry_key *parent;
 259         const char *n;
 260         TALLOC_CTX *mem_ctx = talloc_init("reg_key_del_abs");
 261         WERROR error;
 262
 263         if (!strchr(path, '\\')) {
 264                 return WERR_FOOBAR;
 265         }
 266
 267         error = get_abs_parent(mem_ctx, ctx, path, &parent, &n);
 268         if (W_ERROR_IS_OK(error)) {
 269                 error = reg_key_del(mem_ctx, parent, n);
 270         }
 271
 272         talloc_free(mem_ctx);
 273
 274         return error;
 275 }
 276
 277 WERROR reg_key_add_abs(TALLOC_CTX *mem_ctx, struct registry_context *ctx,
 278                        const char *path, uint32_t access_mask,
 279                        struct security_descriptor *sec_desc,
 280                        struct registry_key **result)
 281 {
 282         struct registry_key *parent;
 283         const char *n;
 284         WERROR error;
 285
 286         *result = NULL;
 287
 288         if (!strchr(path, '\\')) {
 289                 return WERR_ALREADY_EXISTS;
 290         }
 291
 292         error = get_abs_parent(mem_ctx, ctx, path, &parent, &n);
 293         if (!W_ERROR_IS_OK(error)) {
 294                 DEBUG(2, ("Opening parent of %s failed with %s\n", path,
 295                                   win_errstr(error)));
 296                 return error;
 297         }
 298
 299         error = reg_key_add_name(mem_ctx, parent, n, NULL, sec_desc, result);
 300
 301         return error;
 302 }