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