source/lib/registry/patchfile_preg.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Reading Registry.pol PReg registry files
   4
   5    Copyright (C) Wilco Baan Hofman 2006-2008
   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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23 #include "lib/registry/registry.h"
  24 #include "system/filesys.h"
  25 #include "param/param.h"
  26 #include "librpc/gen_ndr/winreg.h"
  27
  28 struct preg_data {
  29         int fd;
  30         TALLOC_CTX *ctx;
  31         struct smb_iconv_convenience *ic;
  32 };
  33
  34 static WERROR preg_read_utf16(struct smb_iconv_convenience *ic, int fd, char *c)
  35 {
  36         uint16_t v;
  37
  38         if (read(fd, &v, 2) < 2) {
  39                 return WERR_GENERAL_FAILURE;
  40         }
  41         push_codepoint(ic, c, v);
  42         return WERR_OK;
  43 }
  44 static WERROR preg_write_utf16(struct smb_iconv_convenience *ic, int fd, const char *string)
  45 {
  46         codepoint_t v;
  47         uint16_t i;
  48         size_t size;
  49
  50         for (i = 0; i < strlen(string); i+=size) {
  51                 v = next_codepoint(ic, &string[i], &size);
  52                 if (write(fd, &v, 2) < 2) {
  53                         return WERR_GENERAL_FAILURE;
  54                 }
  55         }
  56         return WERR_OK;
  57 }
  58 /* PReg does not support adding keys. */
  59 static WERROR reg_preg_diff_add_key(void *_data, const char *key_name)
  60 {
  61         return WERR_OK;
  62 }
  63
  64 static WERROR reg_preg_diff_set_value(void *_data, const char *key_name,
  65                                       const char *value_name,
  66                                       uint32_t value_type, DATA_BLOB value_data)
  67 {
  68         struct preg_data *data = _data;
  69         uint32_t buf;
  70
  71         preg_write_utf16(data->ic, data->fd, "[");
  72         preg_write_utf16(data->ic, data->fd, key_name);
  73         preg_write_utf16(data->ic, data->fd, ";");
  74         preg_write_utf16(data->ic, data->fd, value_name);
  75         preg_write_utf16(data->ic, data->fd, ";");
  76         SIVAL(&buf, 0, value_type);
  77         write(data->fd, &buf, sizeof(uint32_t));
  78         preg_write_utf16(data->ic, data->fd, ";");
  79         SIVAL(&buf, 0, value_data.length);
  80         write(data->fd, &buf, sizeof(uint32_t));
  81         preg_write_utf16(data->ic, data->fd, ";");
  82         write(data->fd, value_data.data, value_data.length);
  83         preg_write_utf16(data->ic, data->fd, "]");
  84
  85         return WERR_OK;
  86 }
  87
  88 static WERROR reg_preg_diff_del_key(void *_data, const char *key_name)
  89 {
  90         struct preg_data *data = _data;
  91         char *parent_name;
  92         DATA_BLOB blob;
  93
  94         parent_name = talloc_strndup(data->ctx, key_name, strrchr(key_name, '\\')-key_name);
  95         blob.data = (void *)talloc_strndup(data->ctx, key_name+(strrchr(key_name, '\\')-key_name)+1,
  96                         strlen(key_name)-(strrchr(key_name, '\\')-key_name));
  97         blob.length = strlen((char *)blob.data)+1;
  98
  99
 100         /* FIXME: These values should be accumulated to be written at done(). */
 101         return reg_preg_diff_set_value(data, parent_name, "**DeleteKeys", REG_SZ, blob);
 102 }
 103
 104 static WERROR reg_preg_diff_del_value(void *_data, const char *key_name,
 105                                       const char *value_name)
 106 {
 107         struct preg_data *data = _data;
 108         char *val;
 109         DATA_BLOB blob;
 110
 111         val = talloc_asprintf(data->ctx, "**Del.%s", value_name);
 112
 113         blob.data = (void *)talloc(data->ctx, uint32_t);
 114         *(uint32_t *)blob.data = 0;
 115         blob.length = 4;
 116         return reg_preg_diff_set_value(data, key_name, val, REG_DWORD, blob);
 117 }
 118
 119 static WERROR reg_preg_diff_del_all_values(void *_data, const char *key_name)
 120 {
 121         struct preg_data *data = _data;
 122         DATA_BLOB blob;
 123
 124         blob.data = (void *)talloc(data->ctx, uint32_t);
 125         *(uint32_t *)blob.data = 0;
 126         blob.length = 4;
 127
 128         return reg_preg_diff_set_value(data, key_name, "**DelVals.", REG_DWORD, blob);
 129 }
 130
 131 static WERROR reg_preg_diff_done(void *_data)
 132 {
 133         struct preg_data *data = (struct preg_data *)_data;
 134
 135         close(data->fd);
 136         talloc_free(data);
 137         return WERR_OK;
 138 }
 139
 140 /**
 141  * Save registry diff
 142  */
 143 _PUBLIC_ WERROR reg_preg_diff_save(TALLOC_CTX *ctx, const char *filename,
 144                                    struct smb_iconv_convenience *ic,
 145                                    struct reg_diff_callbacks **callbacks,
 146                                    void **callback_data)
 147 {
 148         struct preg_data *data;
 149         struct {
 150                 char hdr[4];
 151                 uint32_t version;
 152         } preg_header;
 153
 154
 155         data = talloc_zero(ctx, struct preg_data);
 156         *callback_data = data;
 157
 158         if (filename) {
 159                 data->fd = open(filename, O_CREAT|O_WRONLY, 0755);
 160                 if (data->fd < 0) {
 161                         DEBUG(0, ("Unable to open %s\n", filename));
 162                         return WERR_BADFILE;
 163                 }
 164         } else {
 165                 data->fd = STDOUT_FILENO;
 166         }
 167
 168         strncpy(preg_header.hdr, "PReg", 4);
 169         SIVAL(&preg_header, 4, 1);
 170         write(data->fd, (uint8_t *)&preg_header,8);
 171
 172         data->ctx = ctx;
 173         data->ic = ic;
 174
 175         *callbacks = talloc(ctx, struct reg_diff_callbacks);
 176
 177         (*callbacks)->add_key = reg_preg_diff_add_key;
 178         (*callbacks)->del_key = reg_preg_diff_del_key;
 179         (*callbacks)->set_value = reg_preg_diff_set_value;
 180         (*callbacks)->del_value = reg_preg_diff_del_value;
 181         (*callbacks)->del_all_values = reg_preg_diff_del_all_values;
 182         (*callbacks)->done = reg_preg_diff_done;
 183
 184         return WERR_OK;
 185 }
 186 /**
 187  * Load diff file
 188  */
 189 _PUBLIC_ WERROR reg_preg_diff_load(int fd,
 190                                    struct smb_iconv_convenience *iconv_convenience,
 191                                    const struct reg_diff_callbacks *callbacks,
 192                                    void *callback_data)
 193 {
 194         struct {
 195                 char hdr[4];
 196                 uint32_t version;
 197         } preg_header;
 198         char *buf;
 199         size_t buf_size = 1024;
 200         char *buf_ptr;
 201         TALLOC_CTX *mem_ctx = talloc_init("reg_preg_diff_load");
 202         WERROR ret = WERR_OK;
 203         DATA_BLOB data = {NULL, 0};
 204         char *key = NULL;
 205         char *value_name = NULL;
 206
 207         buf = talloc_array(mem_ctx, char, buf_size);
 208         buf_ptr = buf;
 209
 210         /* Read first 8 bytes (the header) */
 211         if (read(fd, &preg_header, 8) != 8) {
 212                 DEBUG(0, ("Could not read PReg file: %s\n",
 213                                 strerror(errno)));
 214                 ret = WERR_GENERAL_FAILURE;
 215                 goto cleanup;
 216         }
 217         preg_header.version = IVAL(&preg_header.version, 0);
 218
 219         if (strncmp(preg_header.hdr, "PReg", 4) != 0) {
 220                 DEBUG(0, ("This file is not a valid preg registry file\n"));
 221                 ret = WERR_GENERAL_FAILURE;
 222                 goto cleanup;
 223         }
 224         if (preg_header.version > 1) {
 225                 DEBUG(0, ("Warning: file format version is higher than expected.\n"));
 226         }
 227
 228         /* Read the entries */
 229         while(1) {
 230                 uint32_t value_type, length;
 231
 232                 if (!W_ERROR_IS_OK(preg_read_utf16(iconv_convenience, fd, buf_ptr))) {
 233                         break;
 234                 }
 235                 if (*buf_ptr != '[') {
 236                         DEBUG(0, ("Error in PReg file.\n"));
 237                         ret = WERR_GENERAL_FAILURE;
 238                         goto cleanup;
 239                 }
 240
 241                 /* Get the path */
 242                 buf_ptr = buf;
 243                 while (W_ERROR_IS_OK(preg_read_utf16(iconv_convenience, fd, buf_ptr)) &&
 244                        *buf_ptr != ';' && buf_ptr-buf < buf_size) {
 245                         buf_ptr++;
 246                 }
 247                 buf[buf_ptr-buf] = '\0';
 248                 key = talloc_strdup(mem_ctx, buf);
 249
 250                 /* Get the name */
 251                 buf_ptr = buf;
 252                 while (W_ERROR_IS_OK(preg_read_utf16(iconv_convenience, fd, buf_ptr)) &&
 253                        *buf_ptr != ';' && buf_ptr-buf < buf_size) {
 254                         buf_ptr++;
 255                 }
 256                 buf[buf_ptr-buf] = '\0';
 257                 value_name = talloc_strdup(mem_ctx, buf);
 258
 259                 /* Get the type */
 260                 if (read(fd, &value_type, 4) < 4) {
 261                         DEBUG(0, ("Error while reading PReg\n"));
 262                         ret = WERR_GENERAL_FAILURE;
 263                         goto cleanup;
 264                 }
 265                 value_type = IVAL(&value_type, 0);
 266
 267                 /* Read past delimiter */
 268                 buf_ptr = buf;
 269                 if (!(W_ERROR_IS_OK(preg_read_utf16(iconv_convenience, fd, buf_ptr)) &&
 270                     *buf_ptr == ';') && buf_ptr-buf < buf_size) {
 271                         DEBUG(0, ("Error in PReg file.\n"));
 272                         ret = WERR_GENERAL_FAILURE;
 273                         goto cleanup;
 274                 }
 275                 /* Get data length */
 276                 if (read(fd, &length, 4) < 4) {
 277                         DEBUG(0, ("Error while reading PReg\n"));
 278                         ret = WERR_GENERAL_FAILURE;
 279                         goto cleanup;
 280                 }
 281                 /* Read past delimiter */
 282                 buf_ptr = buf;
 283                 if (!(W_ERROR_IS_OK(preg_read_utf16(iconv_convenience, fd, buf_ptr)) &&
 284                     *buf_ptr == ';') && buf_ptr-buf < buf_size) {
 285                         DEBUG(0, ("Error in PReg file.\n"));
 286                         ret = WERR_GENERAL_FAILURE;
 287                         goto cleanup;
 288                 }
 289                 /* Get the data */
 290                 buf_ptr = buf;
 291                 if (length < buf_size &&
 292                     read(fd, buf_ptr, length) != length) {
 293                         DEBUG(0, ("Error while reading PReg\n"));
 294                         ret = WERR_GENERAL_FAILURE;
 295                         goto cleanup;
 296                 }
 297                 data = data_blob_talloc(mem_ctx, buf, length);
 298
 299                 /* Check if delimiter is in place (whine if it isn't) */
 300                 buf_ptr = buf;
 301                 if (!(W_ERROR_IS_OK(preg_read_utf16(iconv_convenience, fd, buf_ptr)) &&
 302                     *buf_ptr == ']') && buf_ptr-buf < buf_size) {
 303                         DEBUG(0, ("Warning: Missing ']' in PReg file, expected ']', got '%c' 0x%x.\n",
 304                                 *buf_ptr, *buf_ptr));
 305                 }
 306
 307                 if (strcasecmp(value_name, "**DelVals") == 0) {
 308                         callbacks->del_all_values(callback_data, key);
 309                 } else if (strncasecmp(value_name, "**Del.",6) == 0) {
 310                         char *p = value_name+6;
 311
 312                         callbacks->del_value(callback_data, key, p);
 313                 } else  if (strcasecmp(value_name, "**DeleteValues") == 0) {
 314                         char *p, *q;
 315
 316                         p = (char *) data.data;
 317
 318                         while ((q = strchr_m(p, ';'))) {
 319                                 *q = '\0';
 320                                 q++;
 321
 322                                 callbacks->del_value(callback_data, key, p);
 323
 324                                 p = q;
 325                         }
 326                         callbacks->del_value(callback_data, key, p);
 327                 } else if (strcasecmp(value_name, "**DeleteKeys") == 0) {
 328                         char *p, *q, *full_key;
 329
 330                         p = (char *) data.data;
 331
 332                         while ((q = strchr_m(p, ';'))) {
 333                                 *q = '\0';
 334                                 q++;
 335
 336                                 full_key = talloc_asprintf(mem_ctx, "%s\\%s",
 337                                                            key, p);
 338                                 callbacks->del_key(callback_data, full_key);
 339                                 talloc_free(full_key);
 340
 341                                 p = q;
 342                         }
 343                         full_key = talloc_asprintf(mem_ctx, "%s\\%s", key, p);
 344                         callbacks->del_key(callback_data, full_key);
 345                         talloc_free(full_key);
 346                 } else {
 347                         callbacks->add_key(callback_data, key);
 348                         callbacks->set_value(callback_data, key, value_name,
 349                                              value_type, data);
 350                 }
 351         }
 352 cleanup:
 353         close(fd);
 354         talloc_free(data.data);
 355         talloc_free(key);
 356         talloc_free(value_name);
 357         talloc_free(buf);
 358         return ret;
 359 }