diff options
Diffstat (limited to 'source3/registry/reg_backend_db.c')
| -rw-r--r-- | source3/registry/reg_backend_db.c | 2270 |
1 files changed, 2270 insertions, 0 deletions
diff --git a/source3/registry/reg_backend_db.c b/source3/registry/reg_backend_db.c new file mode 100644 index 0000000..44b3b5f --- /dev/null +++ b/source3/registry/reg_backend_db.c @@ -0,0 +1,2270 @@ +/* + * Unix SMB/CIFS implementation. + * Virtual Windows Registry Layer + * Copyright (C) Gerald Carter 2002-2005 + * Copyright (C) Michael Adam 2007-2011 + * Copyright (C) Gregor Beck 2011 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +/* Implementation of internal registry database functions. */ + +#include "includes.h" +#include "system/filesys.h" +#include "registry.h" +#include "reg_db.h" +#include "reg_util_internal.h" +#include "reg_parse_internal.h" +#include "reg_backend_db.h" +#include "reg_objects.h" +#include "nt_printing.h" +#include "util_tdb.h" +#include "dbwrap/dbwrap.h" +#include "dbwrap/dbwrap_open.h" +#include "../libcli/security/secdesc.h" + +#undef DBGC_CLASS +#define DBGC_CLASS DBGC_REGISTRY + +#define REGDB_VERSION_KEYNAME "INFO/version" + +static struct db_context *regdb = NULL; +static int regdb_refcount; + +static bool regdb_key_exists(struct db_context *db, const char *key); +static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key, + struct regsubkey_ctr *ctr); +static bool regdb_store_keys_internal(struct db_context *db, const char *key, + struct regsubkey_ctr *ctr); +static int regdb_fetch_values_internal(struct db_context *db, const char* key, + struct regval_ctr *values); +static NTSTATUS regdb_store_values_internal(struct db_context *db, const char *key, + struct regval_ctr *values); +static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent, + const char *key); + +static WERROR regdb_create_basekey(struct db_context *db, const char *key); +static WERROR regdb_create_subkey_internal(struct db_context *db, + const char *key, + const char *subkey); + + +struct regdb_trans_ctx { + NTSTATUS (*action)(struct db_context *, void *); + void *private_data; +}; + +static NTSTATUS regdb_trans_do_action(struct db_context *db, void *private_data) +{ + NTSTATUS status; + int32_t version_id; + struct regdb_trans_ctx *ctx = (struct regdb_trans_ctx *)private_data; + + status = dbwrap_fetch_int32_bystring(db, REGDB_VERSION_KEYNAME, + &version_id); + + if (!NT_STATUS_IS_OK(status)) { + DEBUG(0, ("ERROR: could not fetch registry db version: %s. " + "Denying access.\n", nt_errstr(status))); + return NT_STATUS_ACCESS_DENIED; + } + + if (version_id != REGDB_CODE_VERSION) { + DEBUG(0, ("ERROR: changed registry version %d found while " + "trying to write to the registry. Version %d " + "expected. Denying access.\n", + version_id, REGDB_CODE_VERSION)); + return NT_STATUS_ACCESS_DENIED; + } + + status = ctx->action(db, ctx->private_data); + return status; +} + +static WERROR regdb_trans_do(struct db_context *db, + NTSTATUS (*action)(struct db_context *, void *), + void *private_data) +{ + NTSTATUS status; + struct regdb_trans_ctx ctx; + + + ctx.action = action; + ctx.private_data = private_data; + + status = dbwrap_trans_do(db, regdb_trans_do_action, &ctx); + + return ntstatus_to_werror(status); +} + +/* List the deepest path into the registry. All part components will be created.*/ + +/* If you want to have a part of the path controlled by the tdb and part by + a virtual registry db (e.g. printing), then you have to list the deepest path. + For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print" + allows the reg_db backend to handle everything up to + "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook + the reg_printing backend onto the last component of the path (see + KEY_PRINTING_2K in include/rpc_reg.h) --jerry */ + +static const char *builtin_registry_paths[] = { + KEY_PRINTING_2K, + KEY_PCC, + KEY_PRINTING_PORTS, + KEY_PRINTING, + KEY_PRINTING "\\Forms", + KEY_PRINTING "\\Printers", + KEY_PRINTING "\\Environments\\Windows NT x86\\Print Processors\\winprint", + KEY_PRINTING "\\Environments\\Windows x64\\Print Processors\\winprint", + KEY_SHARES, + KEY_EVENTLOG, + KEY_SMBCONF, + KEY_PERFLIB, + KEY_PERFLIB_009, + KEY_GROUP_POLICY, + KEY_SAMBA_GROUP_POLICY, + KEY_GP_MACHINE_POLICY, + KEY_GP_MACHINE_WIN_POLICY, + KEY_HKCU, + KEY_GP_USER_POLICY, + KEY_GP_USER_WIN_POLICY, + "HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\GPExtensions", + "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors", + KEY_PROD_OPTIONS, + "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration", + KEY_TCPIP_PARAMS, + KEY_NETLOGON_PARAMS, + KEY_HKU, + KEY_HKCR, + KEY_HKPD, + KEY_HKPT, + NULL }; + +struct builtin_regkey_value { + const char *path; + const char *valuename; + uint32_t type; + union { + const char *string; + uint32_t dw_value; + } data; +}; + +static struct builtin_regkey_value builtin_registry_values[] = { + { KEY_PRINTING_PORTS, + SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } }, + { KEY_PRINTING_2K, + "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } }, + { KEY_EVENTLOG, + "DisplayName", REG_SZ, { "Event Log" } }, + { KEY_EVENTLOG, + "ErrorControl", REG_DWORD, { (char*)0x00000001 } }, + { NULL, NULL, 0, { NULL } } +}; + +static WERROR create_key_recursive(struct db_context *db, + char *path, + const char *subkey) +{ + WERROR werr; + char *p; + + if (subkey == NULL) { + return WERR_INVALID_PARAMETER; + } + + if (path == NULL) { + return regdb_create_basekey(db, subkey); + } + + p = strrchr_m(path, '\\'); + + if (p == NULL) { + werr = create_key_recursive(db, NULL, path); + } else { + *p = '\0'; + werr = create_key_recursive(db, path, p+1); + *p = '\\'; + } + + if (!W_ERROR_IS_OK(werr)) { + goto done; + } + + werr = regdb_create_subkey_internal(db, path, subkey); + +done: + return werr; +} + +/** + * Initialize a key in the registry: + * create each component key of the specified path. + */ +static WERROR init_registry_key_internal(struct db_context *db, + const char *add_path) +{ + char *subkey, *key; + WERROR werr; + TALLOC_CTX *frame = talloc_stackframe(); + + if (add_path == NULL) { + werr = WERR_INVALID_PARAMETER; + goto done; + } + + key = talloc_strdup(frame, add_path); + + subkey = strrchr_m(key, '\\'); + if (subkey == NULL) { + subkey = key; + key = NULL; + } else { + *subkey = '\0'; + subkey++; + } + + werr = create_key_recursive(db, key, subkey); + +done: + talloc_free(frame); + return werr; +} + +struct init_registry_key_context { + const char *add_path; +}; + +static NTSTATUS init_registry_key_action(struct db_context *db, + void *private_data) +{ + struct init_registry_key_context *init_ctx = + (struct init_registry_key_context *)private_data; + + return werror_to_ntstatus(init_registry_key_internal( + db, init_ctx->add_path)); +} + +/** + * Initialize a key in the registry: + * create each component key of the specified path, + * wrapped in one db transaction. + */ +WERROR init_registry_key(const char *add_path) +{ + struct init_registry_key_context init_ctx; + + if (regdb_key_exists(regdb, add_path)) { + return WERR_OK; + } + + init_ctx.add_path = add_path; + + return regdb_trans_do(regdb, + init_registry_key_action, + &init_ctx); +} + +/*********************************************************************** + Open the registry data in the tdb + ***********************************************************************/ + +static void regdb_ctr_add_value(struct regval_ctr *ctr, + struct builtin_regkey_value *value) +{ + switch(value->type) { + case REG_DWORD: + regval_ctr_addvalue(ctr, value->valuename, REG_DWORD, + (uint8_t *)&value->data.dw_value, + sizeof(uint32_t)); + break; + + case REG_SZ: + regval_ctr_addvalue_sz(ctr, value->valuename, + value->data.string); + break; + + default: + DEBUG(0, ("regdb_ctr_add_value: invalid value type in " + "registry values [%d]\n", value->type)); + } +} + +static NTSTATUS init_registry_data_action(struct db_context *db, + void *private_data) +{ + NTSTATUS status; + TALLOC_CTX *frame = talloc_stackframe(); + struct regval_ctr *values; + int i; + + /* loop over all of the predefined paths and add each component */ + + for (i=0; builtin_registry_paths[i] != NULL; i++) { + if (regdb_key_exists(db, builtin_registry_paths[i])) { + continue; + } + status = werror_to_ntstatus(init_registry_key_internal(db, + builtin_registry_paths[i])); + if (!NT_STATUS_IS_OK(status)) { + goto done; + } + } + + /* loop over all of the predefined values and add each component */ + + for (i=0; builtin_registry_values[i].path != NULL; i++) { + WERROR werr; + + werr = regval_ctr_init(frame, &values); + if (!W_ERROR_IS_OK(werr)) { + status = werror_to_ntstatus(werr); + goto done; + } + + regdb_fetch_values_internal(db, + builtin_registry_values[i].path, + values); + + /* preserve existing values across restarts. Only add new ones */ + + if (!regval_ctr_value_exists(values, + builtin_registry_values[i].valuename)) + { + regdb_ctr_add_value(values, + &builtin_registry_values[i]); + status = regdb_store_values_internal(db, + builtin_registry_values[i].path, + values); + if (!NT_STATUS_IS_OK(status)) { + goto done; + } + } + TALLOC_FREE(values); + } + + status = NT_STATUS_OK; + +done: + + TALLOC_FREE(frame); + return status; +} + +WERROR init_registry_data(void) +{ + WERROR werr; + TALLOC_CTX *frame = talloc_stackframe(); + struct regval_ctr *values; + int i; + + /* + * First, check for the existence of the needed keys and values. + * If all do already exist, we can save the writes. + */ + for (i=0; builtin_registry_paths[i] != NULL; i++) { + if (!regdb_key_exists(regdb, builtin_registry_paths[i])) { + goto do_init; + } + } + + for (i=0; builtin_registry_values[i].path != NULL; i++) { + werr = regval_ctr_init(frame, &values); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + regdb_fetch_values_internal(regdb, + builtin_registry_values[i].path, + values); + if (!regval_ctr_value_exists(values, + builtin_registry_values[i].valuename)) + { + TALLOC_FREE(values); + goto do_init; + } + + TALLOC_FREE(values); + } + + werr = WERR_OK; + goto done; + +do_init: + + /* + * There are potentially quite a few store operations which are all + * individually wrapped in tdb transactions. Wrapping them in a single + * transaction gives just a single transaction_commit() to actually do + * its fsync()s. See tdb/common/transaction.c for info about nested + * transaction behaviour. + */ + + werr = regdb_trans_do(regdb, + init_registry_data_action, + NULL); + +done: + TALLOC_FREE(frame); + return werr; +} + +static int regdb_normalize_keynames_fn(struct db_record *rec, + void *private_data) +{ + TALLOC_CTX *mem_ctx = talloc_tos(); + const char *keyname; + NTSTATUS status; + TDB_DATA key; + TDB_DATA value; + struct db_context *db = (struct db_context *)private_data; + + key = dbwrap_record_get_key(rec); + if (key.dptr == NULL || key.dsize == 0) { + return 0; + } + + value = dbwrap_record_get_value(rec); + + if (db == NULL) { + DEBUG(0, ("regdb_normalize_keynames_fn: ERROR: " + "NULL db context handed in via private_data\n")); + return 1; + } + + if (strncmp((const char *)key.dptr, REGDB_VERSION_KEYNAME, + strlen(REGDB_VERSION_KEYNAME)) == 0) + { + return 0; + } + + keyname = strchr((const char *)key.dptr, '/'); + if (keyname) { + keyname = talloc_string_sub(mem_ctx, + (const char *)key.dptr, + "/", + "\\"); + + DEBUG(2, ("regdb_normalize_keynames_fn: Convert %s to %s\n", + (const char *)key.dptr, + keyname)); + + /* Delete the original record and store the normalized key */ + status = dbwrap_record_delete(rec); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(0,("regdb_normalize_keynames_fn: " + "tdb_delete for [%s] failed!\n", + (const char *)key.dptr)); + return 1; + } + + status = dbwrap_store_bystring(db, keyname, value, TDB_REPLACE); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(0,("regdb_normalize_keynames_fn: " + "failed to store new record for [%s]!\n", + keyname)); + return 1; + } + } + + return 0; +} + +static WERROR regdb_store_regdb_version(struct db_context *db, uint32_t version) +{ + NTSTATUS status; + if (db == NULL) { + return WERR_CAN_NOT_COMPLETE; + } + + status = dbwrap_trans_store_int32_bystring(db, REGDB_VERSION_KEYNAME, + version); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1, ("regdb_store_regdb_version: error storing %s = %d: %s\n", + REGDB_VERSION_KEYNAME, version, nt_errstr(status))); + return ntstatus_to_werror(status); + } else { + DEBUG(10, ("regdb_store_regdb_version: stored %s = %d\n", + REGDB_VERSION_KEYNAME, version)); + return WERR_OK; + } +} + +static WERROR regdb_upgrade_v1_to_v2(struct db_context *db) +{ + TALLOC_CTX *mem_ctx; + NTSTATUS status; + WERROR werr; + + mem_ctx = talloc_stackframe(); + + status = dbwrap_traverse(db, regdb_normalize_keynames_fn, db, NULL); + if (!NT_STATUS_IS_OK(status)) { + werr = WERR_REGISTRY_IO_FAILED; + goto done; + } + + werr = regdb_store_regdb_version(db, REGDB_VERSION_V2); + +done: + talloc_free(mem_ctx); + return werr; +} + +static bool tdb_data_read_uint32(TDB_DATA *buf, uint32_t *result) +{ + const size_t len = sizeof(uint32_t); + if (buf->dsize >= len) { + *result = IVAL(buf->dptr, 0); + buf->dptr += len; + buf->dsize -= len; + return true; + } + return false; +} + +static bool tdb_data_read_cstr(TDB_DATA *buf, char **result) +{ + const size_t len = strnlen((char*)buf->dptr, buf->dsize) + 1; + if (buf->dsize >= len) { + *result = (char*)buf->dptr; + buf->dptr += len; + buf->dsize -= len; + return true; + } + return false; +} + +static bool tdb_data_is_cstr(TDB_DATA d) { + if (tdb_data_is_empty(d) || (d.dptr[d.dsize-1] != '\0')) { + return false; + } + return strlen((char *)d.dptr) == (d.dsize-1); +} + +static bool upgrade_v2_to_v3_check_subkeylist(struct db_context *db, + const char *key, + const char *subkey) +{ + static uint32_t zero = 0; + static TDB_DATA empty_subkey_list = { + .dptr = (unsigned char*)&zero, + .dsize = sizeof(uint32_t), + }; + bool success = false; + char *path = talloc_asprintf(talloc_tos(), "%s\\%s", key, subkey); + if (!strupper_m(path)) { + goto done; + } + + if (!dbwrap_exists(db, string_term_tdb_data(path))) { + NTSTATUS status; + + DEBUG(10, ("regdb_upgrade_v2_to_v3: writing subkey list [%s]\n", + path)); + + status = dbwrap_store_bystring(db, path, empty_subkey_list, + TDB_INSERT); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(0, ("regdb_upgrade_v2_to_v3: writing subkey list " + "[%s] failed\n", path)); + goto done; + } + } + success = true; +done: + talloc_free(path); + return success; +} + +static bool upgrade_v2_to_v3_check_parent(struct db_context *db, + const char *key) +{ + const char *sep = strrchr_m(key, '\\'); + if (sep != NULL) { + char *pkey = talloc_strndup(talloc_tos(), key, sep-key); + if (!dbwrap_exists(db, string_term_tdb_data(pkey))) { + DEBUG(0, ("regdb_upgrade_v2_to_v3: missing subkey list " + "[%s]\nrun \"net registry check\"\n", pkey)); + } + talloc_free(pkey); + } + return true; +} + + +#define IS_EQUAL(d,s) (((d).dsize == strlen(s)+1) && \ + (strcmp((char*)(d).dptr, (s)) == 0)) +#define STARTS_WITH(d,s) (((d).dsize > strlen(s)) && \ + (strncmp((char*)(d).dptr, (s), strlen(s)) == 0)) +#define SSTR(d) (int)(d).dsize , (char*)(d).dptr + + +static int regdb_upgrade_v2_to_v3_fn(struct db_record *rec, void *private_data) +{ + struct db_context *db = (struct db_context *)private_data; + TDB_DATA key = dbwrap_record_get_key(rec); + TDB_DATA val = dbwrap_record_get_value(rec); + + if (tdb_data_is_empty(key)) { + return 0; + } + + if (db == NULL) { + DEBUG(0, ("regdb_upgrade_v2_to_v3_fn: ERROR: " + "NULL db context handed in via private_data\n")); + return 1; + } + + if (IS_EQUAL(key, REGDB_VERSION_KEYNAME) || + STARTS_WITH(key, REG_VALUE_PREFIX) || + STARTS_WITH(key, REG_SECDESC_PREFIX)) + { + DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping [%.*s]\n", + SSTR(key))); + return 0; + } + + if (STARTS_WITH(key, REG_SORTED_SUBKEYS_PREFIX)) { + NTSTATUS status; + /* Delete the deprecated sorted subkeys cache. */ + + DEBUG(10, ("regdb_upgrade_v2_to_v3: deleting [%.*s]\n", + SSTR(key))); + + status = dbwrap_record_delete(rec); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(0, ("regdb_upgrade_v2_to_v3: deleting [%.*s] " + "failed!\n", SSTR(key))); + return 1; + } + + return 0; + } + + if ( tdb_data_is_cstr(key) && + hive_info((char*)key.dptr) != NULL ) + { + /* + * Found a regular subkey list record. + * Walk the list and create the list record for those + * subkeys that don't already have one. + */ + TDB_DATA pos = val; + char *subkey, *path = (char*)key.dptr; + uint32_t num_items, found_items = 0; + + + DEBUG(10, ("regdb_upgrade_v2_to_v3: scanning subkeylist of " + "[%s]\n", path)); + + if (!tdb_data_read_uint32(&pos, &num_items)) { + /* invalid or empty - skip */ + return 0; + } + + while (tdb_data_read_cstr(&pos, &subkey)) { + found_items++; + + if (!upgrade_v2_to_v3_check_subkeylist(db, path, subkey)) + { + return 1; + } + + if (!upgrade_v2_to_v3_check_parent(db, path)) { + return 1; + } + } + if (found_items != num_items) { + DEBUG(0, ("regdb_upgrade_v2_to_v3: inconsistent subkey " + "list [%s]\nrun \"net registry check\"\n", + path)); + } + } else { + DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping invalid [%.*s]\n" + "run \"net registry check\"\n", SSTR(key))); + } + + return 0; +} + +static WERROR regdb_upgrade_v2_to_v3(struct db_context *db) +{ + NTSTATUS status; + WERROR werr; + + status = dbwrap_traverse(db, regdb_upgrade_v2_to_v3_fn, db, NULL); + if (!NT_STATUS_IS_OK(status)) { + werr = WERR_REGISTRY_IO_FAILED; + goto done; + } + + werr = regdb_store_regdb_version(db, REGDB_VERSION_V3); + +done: + return werr; +} + +/*********************************************************************** + Open the registry database + ***********************************************************************/ + +WERROR regdb_init(void) +{ + int32_t vers_id; + WERROR werr; + NTSTATUS status; + char *db_path; + + if (regdb) { + DEBUG(10, ("regdb_init: incrementing refcount (%d->%d)\n", + regdb_refcount, regdb_refcount+1)); + regdb_refcount++; + return WERR_OK; + } + + /* + * Clustered Samba can only work as root because we need messaging to + * talk to ctdb which only works as root. + */ + if (!uid_wrapper_enabled() && lp_clustering() && geteuid() != 0) { + DBG_ERR("Cluster mode requires running as root.\n"); + return WERR_ACCESS_DENIED; + } + + db_path = state_path(talloc_tos(), "registry.tdb"); + if (db_path == NULL) { + return WERR_NOT_ENOUGH_MEMORY; + } + + regdb = db_open(NULL, db_path, 0, + REG_TDB_FLAGS, O_RDWR, 0600, + DBWRAP_LOCK_ORDER_1, REG_DBWRAP_FLAGS); + if (!regdb) { + regdb = db_open(NULL, db_path, 0, + REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600, + DBWRAP_LOCK_ORDER_1, REG_DBWRAP_FLAGS); + if (!regdb) { + werr = ntstatus_to_werror(map_nt_error_from_unix(errno)); + DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n", + db_path, strerror(errno) )); + TALLOC_FREE(db_path); + return werr; + } + + werr = regdb_store_regdb_version(regdb, REGDB_CODE_VERSION); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(1, ("regdb_init: Failed to store version: %s\n", + win_errstr(werr))); + TALLOC_FREE(db_path); + return werr; + } + + DEBUG(10,("regdb_init: Successfully created registry tdb\n")); + } + TALLOC_FREE(db_path); + + regdb_refcount = 1; + DEBUG(10, ("regdb_init: registry db opened. refcount reset (%d)\n", + regdb_refcount)); + + status = dbwrap_fetch_int32_bystring(regdb, REGDB_VERSION_KEYNAME, + &vers_id); + if (!NT_STATUS_IS_OK(status)) { + DBG_DEBUG("Reading registry version failed: %s, " + "initializing to version %d\n", + nt_errstr(status), REGDB_VERSION_V1); + + /* + * There was a regdb format version prior to version 1 + * which did not store a INFO/version key. The format + * of this version was identical to version 1 except for + * the lack of the sorted subkey cache records. + * Since these are disposable, we can safely assume version + * 1 if no INFO/version key is found and run the db through + * the whole chain of upgrade. If the database was not + * initialized, this does not harm. If it was the unversioned + * version ("0"), then it do the right thing with the records. + */ + werr = regdb_store_regdb_version(regdb, REGDB_VERSION_V1); + if (!W_ERROR_IS_OK(werr)) { + return werr; + } + vers_id = REGDB_VERSION_V1; + } + + if (vers_id == REGDB_CODE_VERSION) { + return WERR_OK; + } + + if (vers_id > REGDB_CODE_VERSION || vers_id == 0) { + DEBUG(0, ("regdb_init: unknown registry version %d " + "(code version = %d), refusing initialization\n", + vers_id, REGDB_CODE_VERSION)); + return WERR_CAN_NOT_COMPLETE; + } + + if (dbwrap_transaction_start(regdb) != 0) { + return WERR_REGISTRY_IO_FAILED; + } + + if (vers_id == REGDB_VERSION_V1) { + DEBUG(10, ("regdb_init: upgrading registry from version %d " + "to %d\n", REGDB_VERSION_V1, REGDB_VERSION_V2)); + + werr = regdb_upgrade_v1_to_v2(regdb); + if (!W_ERROR_IS_OK(werr)) { + dbwrap_transaction_cancel(regdb); + return werr; + } + + vers_id = REGDB_VERSION_V2; + } + + if (vers_id == REGDB_VERSION_V2) { + DEBUG(10, ("regdb_init: upgrading registry from version %d " + "to %d\n", REGDB_VERSION_V2, REGDB_VERSION_V3)); + + werr = regdb_upgrade_v2_to_v3(regdb); + if (!W_ERROR_IS_OK(werr)) { + dbwrap_transaction_cancel(regdb); + return werr; + } + + vers_id = REGDB_VERSION_V3; + } + + /* future upgrade code should go here */ + + if (dbwrap_transaction_commit(regdb) != 0) { + return WERR_REGISTRY_IO_FAILED; + } + + return WERR_OK; +} + +/*********************************************************************** + Open the registry. Must already have been initialized by regdb_init() + ***********************************************************************/ + +WERROR regdb_open( void ) +{ + WERROR result; + char *db_path = NULL; + int saved_errno; + + if ( regdb ) { + DEBUG(10, ("regdb_open: incrementing refcount (%d->%d)\n", + regdb_refcount, regdb_refcount+1)); + regdb_refcount++; + result = WERR_OK; + goto done; + } + + db_path = state_path(talloc_tos(), "registry.tdb"); + if (db_path == NULL) { + result = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + + become_root(); + + regdb = db_open(NULL, db_path, 0, + REG_TDB_FLAGS, O_RDWR, 0600, + DBWRAP_LOCK_ORDER_1, REG_DBWRAP_FLAGS); + saved_errno = errno; + unbecome_root(); + if ( !regdb ) { + result = ntstatus_to_werror(map_nt_error_from_unix(saved_errno)); + DEBUG(0,("regdb_open: Failed to open %s! (%s)\n", + db_path, strerror(saved_errno))); + goto done; + } + + regdb_refcount = 1; + DEBUG(10, ("regdb_open: registry db opened. refcount reset (%d)\n", + regdb_refcount)); + + result = WERR_OK; +done: + TALLOC_FREE(db_path); + return result; +} + +/*********************************************************************** + ***********************************************************************/ + +int regdb_close( void ) +{ + if (regdb_refcount == 0) { + return 0; + } + + regdb_refcount--; + + DEBUG(10, ("regdb_close: decrementing refcount (%d->%d)\n", + regdb_refcount+1, regdb_refcount)); + + if ( regdb_refcount > 0 ) + return 0; + + SMB_ASSERT( regdb_refcount >= 0 ); + + TALLOC_FREE(regdb); + return 0; +} + +WERROR regdb_transaction_start(void) +{ + return (dbwrap_transaction_start(regdb) == 0) ? + WERR_OK : WERR_REGISTRY_IO_FAILED; +} + +WERROR regdb_transaction_commit(void) +{ + return (dbwrap_transaction_commit(regdb) == 0) ? + WERR_OK : WERR_REGISTRY_IO_FAILED; +} + +WERROR regdb_transaction_cancel(void) +{ + return (dbwrap_transaction_cancel(regdb) == 0) ? + WERR_OK : WERR_REGISTRY_IO_FAILED; +} + +/*********************************************************************** + return the tdb sequence number of the registry tdb. + this is an indicator for the content of the registry + having changed. it will change upon regdb_init, too, though. + ***********************************************************************/ +int regdb_get_seqnum(void) +{ + return dbwrap_get_seqnum(regdb); +} + + +static WERROR regdb_delete_key_with_prefix(struct db_context *db, + const char *keyname, + const char *prefix) +{ + char *path; + WERROR werr = WERR_NOT_ENOUGH_MEMORY; + TALLOC_CTX *mem_ctx = talloc_stackframe(); + + if (keyname == NULL) { + werr = WERR_INVALID_PARAMETER; + goto done; + } + + if (prefix == NULL) { + path = discard_const_p(char, keyname); + } else { + path = talloc_asprintf(mem_ctx, "%s\\%s", prefix, keyname); + if (path == NULL) { + goto done; + } + } + + path = normalize_reg_path(mem_ctx, path); + if (path == NULL) { + goto done; + } + + werr = ntstatus_to_werror(dbwrap_purge_bystring(db, path)); + +done: + talloc_free(mem_ctx); + return werr; +} + + +static WERROR regdb_delete_values(struct db_context *db, const char *keyname) +{ + return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX); +} + +static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname) +{ + return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX); +} + +static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname) +{ + return regdb_delete_key_with_prefix(db, keyname, NULL); +} + + +static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname) +{ + WERROR werr; + + werr = regdb_delete_values(db, keyname); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n", + REG_VALUE_PREFIX, keyname, win_errstr(werr))); + goto done; + } + + werr = regdb_delete_secdesc(db, keyname); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n", + REG_SECDESC_PREFIX, keyname, win_errstr(werr))); + goto done; + } + + werr = regdb_delete_subkeylist(db, keyname); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(1, (__location__ " Deleting %s failed: %s\n", + keyname, win_errstr(werr))); + goto done; + } + +done: + return werr; +} + +/*********************************************************************** + Add subkey strings to the registry tdb under a defined key + fmt is the same format as tdb_pack except this function only supports + fstrings + ***********************************************************************/ + +static WERROR regdb_store_keys_internal2(struct db_context *db, + const char *key, + struct regsubkey_ctr *ctr) +{ + TDB_DATA dbuf; + uint8_t *buffer = NULL; + uint32_t i = 0; + uint32_t len, buflen; + uint32_t num_subkeys = regsubkey_ctr_numkeys(ctr); + char *keyname = NULL; + TALLOC_CTX *ctx = talloc_stackframe(); + WERROR werr; + + if (!key) { + werr = WERR_INVALID_PARAMETER; + goto done; + } + + keyname = talloc_strdup(ctx, key); + if (!keyname) { + werr = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + + keyname = normalize_reg_path(ctx, keyname); + if (!keyname) { + werr = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + + /* allocate some initial memory */ + + buffer = (uint8_t *)SMB_MALLOC(1024); + if (buffer == NULL) { + werr = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + buflen = 1024; + len = 0; + + /* store the number of subkeys */ + + len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys); + + /* pack all the strings */ + + for (i=0; i<num_subkeys; i++) { + size_t thistime; + + thistime = tdb_pack(buffer+len, buflen-len, "f", + regsubkey_ctr_specific_key(ctr, i)); + if (len+thistime > buflen) { + size_t thistime2; + /* + * tdb_pack hasn't done anything because of the short + * buffer, allocate extra space. + */ + buffer = SMB_REALLOC_ARRAY(buffer, uint8_t, + (len+thistime)*2); + if(buffer == NULL) { + DEBUG(0, ("regdb_store_keys: Failed to realloc " + "memory of size [%u]\n", + (unsigned int)(len+thistime)*2)); + werr = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + buflen = (len+thistime)*2; + thistime2 = tdb_pack( + buffer+len, buflen-len, "f", + regsubkey_ctr_specific_key(ctr, i)); + if (thistime2 != thistime) { + DEBUG(0, ("tdb_pack failed\n")); + werr = WERR_CAN_NOT_COMPLETE; + goto done; + } + } + len += thistime; + } + + /* finally write out the data */ + + dbuf.dptr = buffer; + dbuf.dsize = len; + werr = ntstatus_to_werror(dbwrap_store_bystring(db, keyname, dbuf, + TDB_REPLACE)); + +done: + TALLOC_FREE(ctx); + SAFE_FREE(buffer); + return werr; +} + +/** + * Utility function to store a new empty list of + * subkeys of given key specified as parent and subkey name + * (thereby creating the key). + * If the parent keyname is NULL, then the "subkey" is + * interpreted as a base key. + * If the subkey list does already exist, it is not modified. + * + * Must be called from within a transaction. + */ +static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent, + const char *key) +{ + WERROR werr; + char *path = NULL; + struct regsubkey_ctr *subkeys = NULL; + TALLOC_CTX *frame = talloc_stackframe(); + + if (parent == NULL) { + path = talloc_strdup(frame, key); + } else { + path = talloc_asprintf(frame, "%s\\%s", parent, key); + } + if (!path) { + werr = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + + werr = regsubkey_ctr_init(frame, &subkeys); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + werr = regdb_fetch_keys_internal(db, path, subkeys); + if (W_ERROR_IS_OK(werr)) { + /* subkey list exists already - don't modify */ + goto done; + } + + werr = regsubkey_ctr_reinit(subkeys); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + /* create a record with 0 subkeys */ + werr = regdb_store_keys_internal2(db, path, subkeys); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(0, ("regdb_store_keys: Failed to store new record for " + "key [%s]: %s\n", path, win_errstr(werr))); + goto done; + } + +done: + talloc_free(frame); + return werr; +} + +/*********************************************************************** + Store the new subkey record and create any child key records that + do not currently exist + ***********************************************************************/ + +struct regdb_store_keys_context { + const char *key; + struct regsubkey_ctr *ctr; +}; + +static NTSTATUS regdb_store_keys_action(struct db_context *db, + void *private_data) +{ + struct regdb_store_keys_context *store_ctx; + WERROR werr; + int num_subkeys, i; + char *path = NULL; + struct regsubkey_ctr *old_subkeys = NULL; + char *oldkeyname = NULL; + TALLOC_CTX *mem_ctx = talloc_stackframe(); + + store_ctx = (struct regdb_store_keys_context *)private_data; + + /* + * Re-fetch the old keys inside the transaction + */ + + werr = regsubkey_ctr_init(mem_ctx, &old_subkeys); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + werr = regdb_fetch_keys_internal(db, store_ctx->key, old_subkeys); + if (!W_ERROR_IS_OK(werr) && + !W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) + { + goto done; + } + + /* + * Make the store operation as safe as possible without transactions: + * + * (1) For each subkey removed from ctr compared with old_subkeys: + * + * (a) First delete the value db entry. + * + * (b) Next delete the secdesc db record. + * + * (c) Then delete the subkey list entry. + * + * (2) Now write the list of subkeys of the parent key, + * deleting removed entries and adding new ones. + * + * (3) Finally create the subkey list entries for the added keys. + * + * This way if we crash half-way in between deleting the subkeys + * and storing the parent's list of subkeys, no old data can pop up + * out of the blue when re-adding keys later on. + */ + + /* (1) delete removed keys' lists (values/secdesc/subkeys) */ + + num_subkeys = regsubkey_ctr_numkeys(old_subkeys); + for (i=0; i<num_subkeys; i++) { + oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i); + + if (regsubkey_ctr_key_exists(store_ctx->ctr, oldkeyname)) { + /* + * It's still around, don't delete + */ + continue; + } + + path = talloc_asprintf(mem_ctx, "%s\\%s", store_ctx->key, + oldkeyname); + if (!path) { + werr = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + + werr = regdb_delete_key_lists(db, path); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + TALLOC_FREE(path); + } + + TALLOC_FREE(old_subkeys); + + /* (2) store the subkey list for the parent */ + + werr = regdb_store_keys_internal2(db, store_ctx->key, store_ctx->ctr); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(0,("regdb_store_keys: Failed to store new subkey list " + "for parent [%s]: %s\n", store_ctx->key, + win_errstr(werr))); + goto done; + } + + /* (3) now create records for any subkeys that don't already exist */ + + num_subkeys = regsubkey_ctr_numkeys(store_ctx->ctr); + + for (i=0; i<num_subkeys; i++) { + const char *subkey; + + subkey = regsubkey_ctr_specific_key(store_ctx->ctr, i); + + werr = regdb_store_subkey_list(db, store_ctx->key, subkey); + W_ERROR_NOT_OK_GOTO_DONE(werr); + } + + /* + * Update the seqnum in the container to possibly + * prevent next read from going to disk + */ + werr = regsubkey_ctr_set_seqnum(store_ctx->ctr, dbwrap_get_seqnum(db)); + +done: + talloc_free(mem_ctx); + return werror_to_ntstatus(werr); +} + +static bool regdb_store_keys_internal(struct db_context *db, const char *key, + struct regsubkey_ctr *ctr) +{ + int num_subkeys, old_num_subkeys, i; + struct regsubkey_ctr *old_subkeys = NULL; + TALLOC_CTX *ctx = talloc_stackframe(); + WERROR werr; + bool ret = false; + struct regdb_store_keys_context store_ctx; + + if (!regdb_key_exists(db, key)) { + goto done; + } + + /* + * fetch a list of the old subkeys so we can determine if anything has + * changed + */ + + werr = regsubkey_ctr_init(ctx, &old_subkeys); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(0,("regdb_store_keys: talloc() failure!\n")); + goto done; + } + + werr = regdb_fetch_keys_internal(db, key, old_subkeys); + if (!W_ERROR_IS_OK(werr) && + !W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) + { + goto done; + } + + num_subkeys = regsubkey_ctr_numkeys(ctr); + old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys); + if ((num_subkeys && old_num_subkeys) && + (num_subkeys == old_num_subkeys)) { + + for (i = 0; i < num_subkeys; i++) { + if (strcmp(regsubkey_ctr_specific_key(ctr, i), + regsubkey_ctr_specific_key(old_subkeys, i)) + != 0) + { + break; + } + } + if (i == num_subkeys) { + /* + * Nothing changed, no point to even start a tdb + * transaction + */ + + ret = true; + goto done; + } + } + + TALLOC_FREE(old_subkeys); + + store_ctx.key = key; + store_ctx.ctr = ctr; + + werr = regdb_trans_do(db, + regdb_store_keys_action, + &store_ctx); + + ret = W_ERROR_IS_OK(werr); + +done: + TALLOC_FREE(ctx); + + return ret; +} + +static bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr) +{ + return regdb_store_keys_internal(regdb, key, ctr); +} + +/** + * create a subkey of a given key + */ + +struct regdb_create_subkey_context { + const char *key; + const char *subkey; +}; + +static NTSTATUS regdb_create_subkey_action(struct db_context *db, + void *private_data) +{ + WERROR werr; + struct regdb_create_subkey_context *create_ctx; + struct regsubkey_ctr *subkeys; + TALLOC_CTX *mem_ctx = talloc_stackframe(); + + create_ctx = (struct regdb_create_subkey_context *)private_data; + + werr = regsubkey_ctr_init(mem_ctx, &subkeys); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + werr = regdb_fetch_keys_internal(db, create_ctx->key, subkeys); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(0, (__location__ " failed to store new subkey list for " + "parent key %s: %s\n", create_ctx->key, + win_errstr(werr))); + } + + werr = regdb_store_subkey_list(db, create_ctx->key, create_ctx->subkey); + +done: + talloc_free(mem_ctx); + return werror_to_ntstatus(werr); +} + +static WERROR regdb_create_subkey_internal(struct db_context *db, + const char *key, + const char *subkey) +{ + WERROR werr; + struct regsubkey_ctr *subkeys; + TALLOC_CTX *mem_ctx = talloc_stackframe(); + struct regdb_create_subkey_context create_ctx; + + if (!regdb_key_exists(db, key)) { + werr = WERR_NOT_FOUND; + goto done; + } + + werr = regsubkey_ctr_init(mem_ctx, &subkeys); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + werr = regdb_fetch_keys_internal(db, key, subkeys); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + if (regsubkey_ctr_key_exists(subkeys, subkey)) { + char *newkey; + + newkey = talloc_asprintf(mem_ctx, "%s\\%s", key, subkey); + if (newkey == NULL) { + werr = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + + if (regdb_key_exists(db, newkey)) { + werr = WERR_OK; + goto done; + } + } + + talloc_free(subkeys); + + create_ctx.key = key; + create_ctx.subkey = subkey; + + werr = regdb_trans_do(db, + regdb_create_subkey_action, + &create_ctx); + +done: + talloc_free(mem_ctx); + return werr; +} + +static WERROR regdb_create_subkey(const char *key, const char *subkey) +{ + return regdb_create_subkey_internal(regdb, key, subkey); +} + +/** + * create a base key + */ + +struct regdb_create_basekey_context { + const char *key; +}; + +static NTSTATUS regdb_create_basekey_action(struct db_context *db, + void *private_data) +{ + WERROR werr; + struct regdb_create_basekey_context *create_ctx; + + create_ctx = (struct regdb_create_basekey_context *)private_data; + + werr = regdb_store_subkey_list(db, NULL, create_ctx->key); + + return werror_to_ntstatus(werr); +} + +static WERROR regdb_create_basekey(struct db_context *db, const char *key) +{ + WERROR werr; + struct regdb_create_subkey_context create_ctx; + + create_ctx.key = key; + + werr = regdb_trans_do(db, + regdb_create_basekey_action, + &create_ctx); + + return werr; +} + +/** + * create a subkey of a given key + */ + +struct regdb_delete_subkey_context { + const char *key; + const char *subkey; + const char *path; + bool lazy; +}; + +static NTSTATUS regdb_delete_subkey_action(struct db_context *db, + void *private_data) +{ + WERROR werr; + struct regdb_delete_subkey_context *delete_ctx; + struct regsubkey_ctr *subkeys; + TALLOC_CTX *mem_ctx = talloc_stackframe(); + + delete_ctx = (struct regdb_delete_subkey_context *)private_data; + + werr = regdb_delete_key_lists(db, delete_ctx->path); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + if (delete_ctx->lazy) { + goto done; + } + + werr = regsubkey_ctr_init(mem_ctx, &subkeys); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + werr = regdb_fetch_keys_internal(db, delete_ctx->key, subkeys); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + werr = regsubkey_ctr_delkey(subkeys, delete_ctx->subkey); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + werr = regdb_store_keys_internal2(db, delete_ctx->key, subkeys); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(0, (__location__ " failed to store new subkey_list for " + "parent key %s: %s\n", delete_ctx->key, + win_errstr(werr))); + } + +done: + talloc_free(mem_ctx); + return werror_to_ntstatus(werr); +} + +static WERROR regdb_delete_subkey(const char *key, const char *subkey, bool lazy) +{ + WERROR werr; + char *path; + struct regdb_delete_subkey_context delete_ctx; + TALLOC_CTX *mem_ctx = talloc_stackframe(); + + if (!regdb_key_exists(regdb, key)) { + werr = WERR_NOT_FOUND; + goto done; + } + + path = talloc_asprintf(mem_ctx, "%s\\%s", key, subkey); + if (path == NULL) { + werr = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + + if (!regdb_key_exists(regdb, path)) { + werr = WERR_OK; + goto done; + } + + delete_ctx.key = key; + delete_ctx.subkey = subkey; + delete_ctx.path = path; + delete_ctx.lazy = lazy; + + werr = regdb_trans_do(regdb, + regdb_delete_subkey_action, + &delete_ctx); + +done: + talloc_free(mem_ctx); + return werr; +} + +static TDB_DATA regdb_fetch_key_internal(struct db_context *db, + TALLOC_CTX *mem_ctx, const char *key) +{ + char *path = NULL; + TDB_DATA data; + NTSTATUS status; + + path = normalize_reg_path(mem_ctx, key); + if (!path) { + return make_tdb_data(NULL, 0); + } + + status = dbwrap_fetch_bystring(db, mem_ctx, path, &data); + if (!NT_STATUS_IS_OK(status)) { + data = tdb_null; + } + + TALLOC_FREE(path); + return data; +} + + +/** + * Check for the existence of a key. + * + * Existence of a key is authoritatively defined by + * the existence of the record that contains the list + * of its subkeys. + * + * Return false, if the record does not match the correct + * structure of an initial 4-byte counter and then a + * list of the corresponding number of zero-terminated + * strings. + */ +static bool regdb_key_exists(struct db_context *db, const char *key) +{ + TALLOC_CTX *mem_ctx = talloc_stackframe(); + TDB_DATA value; + bool ret = false; + char *path; + uint32_t buflen; + const char *buf; + uint32_t num_items, i; + int32_t len; + + if (key == NULL) { + goto done; + } + + path = normalize_reg_path(mem_ctx, key); + if (path == NULL) { + DEBUG(0, ("out of memory! (talloc failed)\n")); + goto done; + } + + if (*path == '\0') { + goto done; + } + + value = regdb_fetch_key_internal(db, mem_ctx, path); + if (value.dptr == NULL) { + goto done; + } + + if (value.dsize == 0) { + DEBUG(10, ("regdb_key_exists: subkeylist-record for key " + "[%s] is empty: Could be a deleted record in a " + "clustered (ctdb) environment?\n", + path)); + goto done; + } + + len = tdb_unpack(value.dptr, value.dsize, "d", &num_items); + if (len == (int32_t)-1) { + DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key " + "[%s] is invalid: Could not parse initial 4-byte " + "counter. record data length is %u.\n", + path, (unsigned int)value.dsize)); + goto done; + } + + /* + * Note: the tdb_unpack check above implies that len <= value.dsize + */ + buflen = value.dsize - len; + buf = (const char *)value.dptr + len; + + for (i = 0; i < num_items; i++) { + if (buflen == 0) { + break; + } + len = strnlen(buf, buflen) + 1; + if (buflen < len) { + DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record " + "for key [%s] is corrupt: %u items expected, " + "item number %u is not zero terminated.\n", + path, num_items, i+1)); + goto done; + } + + buf += len; + buflen -= len; + } + + if (buflen > 0) { + DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key " + "[%s] is corrupt: %u items expected and found, but " + "the record contains additional %u bytes\n", + path, num_items, buflen)); + goto done; + } + + if (i < num_items) { + DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key " + "[%s] is corrupt: %u items expected, but only %u " + "items found.\n", + path, num_items, i+1)); + goto done; + } + + ret = true; + +done: + TALLOC_FREE(mem_ctx); + return ret; +} + + +/*********************************************************************** + Retrieve an array of strings containing subkeys. Memory should be + released by the caller. + ***********************************************************************/ + +static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key, + struct regsubkey_ctr *ctr) +{ + WERROR werr; + uint32_t num_items; + uint8_t *buf; + uint32_t buflen, len; + uint32_t i; + fstring subkeyname; + TALLOC_CTX *frame = talloc_stackframe(); + TDB_DATA value; + int seqnum[2], count; + + DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL")); + + if (!regdb_key_exists(db, key)) { + DEBUG(10, ("key [%s] not found\n", key)); + werr = WERR_NOT_FOUND; + goto done; + } + + werr = regsubkey_ctr_reinit(ctr); + W_ERROR_NOT_OK_GOTO_DONE(werr); + + count = 0; + ZERO_STRUCT(value); + seqnum[0] = dbwrap_get_seqnum(db); + + do { + count++; + TALLOC_FREE(value.dptr); + value = regdb_fetch_key_internal(db, frame, key); + seqnum[count % 2] = dbwrap_get_seqnum(db); + + } while (seqnum[0] != seqnum[1]); + + if (count > 1) { + DEBUG(5, ("regdb_fetch_keys_internal: it took %d attempts to " + "fetch key '%s' with constant seqnum\n", + count, key)); + } + + werr = regsubkey_ctr_set_seqnum(ctr, seqnum[0]); + if (!W_ERROR_IS_OK(werr)) { + goto done; + } + + if (value.dsize == 0 || value.dptr == NULL) { + DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n", + key)); + goto done; + } + + buf = value.dptr; + buflen = value.dsize; + len = tdb_unpack( buf, buflen, "d", &num_items); + if (len == (uint32_t)-1) { + werr = WERR_NOT_FOUND; + goto done; + } + + for (i=0; i<num_items; i++) { + int this_len; + + this_len = tdb_unpack(buf+len, buflen-len, "f", subkeyname); + if (this_len == -1) { + DBG_WARNING("Invalid registry data, " + "tdb_unpack failed\n"); + werr = WERR_INTERNAL_DB_CORRUPTION; + goto done; + } + len += this_len; + if (len < this_len) { + DBG_WARNING("Invalid registry data, " + "integer overflow\n"); + werr = WERR_INTERNAL_DB_CORRUPTION; + goto done; + } + + werr = regsubkey_ctr_addkey(ctr, subkeyname); + if (!W_ERROR_IS_OK(werr)) { + DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey " + "failed: %s\n", win_errstr(werr))); + num_items = 0; + goto done; + } + } + + DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items)); + +done: + TALLOC_FREE(frame); + return werr; +} + +static int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr) +{ + WERROR werr; + + werr = regdb_fetch_keys_internal(regdb, key, ctr); + if (!W_ERROR_IS_OK(werr)) { + return -1; + } + + return regsubkey_ctr_numkeys(ctr); +} + +/**************************************************************************** + Unpack a list of registry values frem the TDB + ***************************************************************************/ + +static int regdb_unpack_values(struct regval_ctr *values, + uint8_t *buf, + size_t buflen) +{ + int this_len; + size_t len = 0; + uint32_t type; + fstring valuename; + uint32_t size; + uint8_t *data_p; + uint32_t num_values = 0; + uint32_t i; + + /* loop and unpack the rest of the registry values */ + + this_len = tdb_unpack(buf, buflen, "d", &num_values); + if (this_len == -1) { + DBG_WARNING("Invalid registry data, " + "tdb_unpack failed\n"); + return -1; + } + len = this_len; + + for ( i=0; i<num_values; i++ ) { + /* unpack the next regval */ + + type = REG_NONE; + size = 0; + data_p = NULL; + valuename[0] = '\0'; + this_len = tdb_unpack(buf+len, buflen-len, "fdB", + valuename, + &type, + &size, + &data_p); + if (this_len == -1) { + DBG_WARNING("Invalid registry data, " + "tdb_unpack failed\n"); + return -1; + } + len += this_len; + if (len < (size_t)this_len) { + DBG_WARNING("Invalid registry data, " + "integer overflow\n"); + return -1; + } + + regval_ctr_addvalue(values, valuename, type, + (uint8_t *)data_p, size); + SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */ + + DEBUG(10, ("regdb_unpack_values: value[%d]: name[%s] len[%d]\n", + i, valuename, size)); + } + + return len; +} + +/**************************************************************************** + Pack all values in all printer keys + ***************************************************************************/ + +static int regdb_pack_values(struct regval_ctr *values, uint8_t *buf, int buflen) +{ + int len = 0; + int i; + struct regval_blob *val; + int num_values; + + if ( !values ) + return 0; + + num_values = regval_ctr_numvals( values ); + + /* pack the number of values first */ + + len += tdb_pack( buf+len, buflen-len, "d", num_values ); + + /* loop over all values */ + + for ( i=0; i<num_values; i++ ) { + val = regval_ctr_specific_value( values, i ); + len += tdb_pack(buf+len, buflen-len, "fdB", + regval_name(val), + regval_type(val), + regval_size(val), + regval_data_p(val) ); + } + + return len; +} + +/*********************************************************************** + Retrieve an array of strings containing subkeys. Memory should be + released by the caller. + ***********************************************************************/ + +static int regdb_fetch_values_internal(struct db_context *db, const char* key, + struct regval_ctr *values) +{ + char *keystr = NULL; + TALLOC_CTX *ctx = talloc_stackframe(); + int ret = 0; + TDB_DATA value; + WERROR werr; + int seqnum[2], count; + + DEBUG(10,("regdb_fetch_values: Looking for values of key [%s]\n", key)); + + if (!regdb_key_exists(db, key)) { + DEBUG(10, ("regb_fetch_values: key [%s] does not exist\n", + key)); + ret = -1; + goto done; + } + + keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key); + if (!keystr) { + goto done; + } + + ZERO_STRUCT(value); + count = 0; + seqnum[0] = dbwrap_get_seqnum(db); + + do { + count++; + TALLOC_FREE(value.dptr); + value = regdb_fetch_key_internal(db, ctx, keystr); + seqnum[count % 2] = dbwrap_get_seqnum(db); + } while (seqnum[0] != seqnum[1]); + + if (count > 1) { + DEBUG(5, ("regdb_fetch_values_internal: it took %d attempts " + "to fetch key '%s' with constant seqnum\n", + count, key)); + } + + werr = regval_ctr_set_seqnum(values, seqnum[0]); + if (!W_ERROR_IS_OK(werr)) { + goto done; + } + + if (!value.dptr) { + /* all keys have zero values by default */ + goto done; + } + + ret = regdb_unpack_values(values, value.dptr, value.dsize); + if (ret == -1) { + DBG_WARNING("regdb_unpack_values failed\n"); + } + + ret = regval_ctr_numvals(values); + +done: + TALLOC_FREE(ctx); + return ret; +} + +static int regdb_fetch_values(const char* key, struct regval_ctr *values) +{ + return regdb_fetch_values_internal(regdb, key, values); +} + +static NTSTATUS regdb_store_values_internal(struct db_context *db, + const char *key, + struct regval_ctr *values) +{ + TDB_DATA old_data, data; + char *keystr = NULL; + TALLOC_CTX *ctx = talloc_stackframe(); + int len; + NTSTATUS status; + WERROR werr; + + DEBUG(10,("regdb_store_values: Looking for values of key [%s]\n", key)); + + if (!regdb_key_exists(db, key)) { + status = NT_STATUS_NOT_FOUND; + goto done; + } + + if (regval_ctr_numvals(values) == 0) { + werr = regdb_delete_values(db, key); + if (!W_ERROR_IS_OK(werr)) { + status = werror_to_ntstatus(werr); + goto done; + } + + /* + * update the seqnum in the cache to prevent the next read + * from going to disk + */ + werr = regval_ctr_set_seqnum(values, dbwrap_get_seqnum(db)); + status = werror_to_ntstatus(werr); + goto done; + } + + ZERO_STRUCT(data); + + len = regdb_pack_values(values, data.dptr, data.dsize); + if (len <= 0) { + DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n")); + status = NT_STATUS_UNSUCCESSFUL; + goto done; + } + + data.dptr = talloc_array(ctx, uint8_t, len); + data.dsize = len; + + len = regdb_pack_values(values, data.dptr, data.dsize); + + SMB_ASSERT( len == data.dsize ); + + keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key ); + if (!keystr) { + status = NT_STATUS_NO_MEMORY; + goto done; + } + keystr = normalize_reg_path(ctx, keystr); + if (!keystr) { + status = NT_STATUS_NO_MEMORY; + goto done; + } + + status = dbwrap_fetch_bystring(db, ctx, keystr, &old_data); + + if (NT_STATUS_IS_OK(status) + && (old_data.dptr != NULL) + && (old_data.dsize == data.dsize) + && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0)) + { + status = NT_STATUS_OK; + goto done; + } + + status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(0, ("regdb_store_values_internal: error storing: %s\n", nt_errstr(status))); + goto done; + } + + /* + * update the seqnum in the cache to prevent the next read + * from going to disk + */ + werr = regval_ctr_set_seqnum(values, dbwrap_get_seqnum(db)); + status = werror_to_ntstatus(werr); + +done: + TALLOC_FREE(ctx); + return status; +} + +struct regdb_store_values_ctx { + const char *key; + struct regval_ctr *values; +}; + +static NTSTATUS regdb_store_values_action(struct db_context *db, + void *private_data) +{ + NTSTATUS status; + struct regdb_store_values_ctx *ctx = + (struct regdb_store_values_ctx *)private_data; + + status = regdb_store_values_internal(db, ctx->key, ctx->values); + + return status; +} + +static bool regdb_store_values(const char *key, struct regval_ctr *values) +{ + WERROR werr; + struct regdb_store_values_ctx ctx; + + ctx.key = key; + ctx.values = values; + + werr = regdb_trans_do(regdb, regdb_store_values_action, &ctx); + + return W_ERROR_IS_OK(werr); +} + +static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key, + struct security_descriptor **psecdesc) +{ + char *tdbkey; + TDB_DATA data; + NTSTATUS status; + TALLOC_CTX *tmp_ctx = talloc_stackframe(); + WERROR err = WERR_OK; + + DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key)); + + if (!regdb_key_exists(regdb, key)) { + err = WERR_FILE_NOT_FOUND; + goto done; + } + + tdbkey = talloc_asprintf(tmp_ctx, "%s\\%s", REG_SECDESC_PREFIX, key); + if (tdbkey == NULL) { + err = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + + tdbkey = normalize_reg_path(tmp_ctx, tdbkey); + if (tdbkey == NULL) { + err = WERR_NOT_ENOUGH_MEMORY; + goto done; + } + + status = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey, &data); + if (!NT_STATUS_IS_OK(status)) { + err = WERR_FILE_NOT_FOUND; + goto done; + } + + status = unmarshall_sec_desc(mem_ctx, (uint8_t *)data.dptr, data.dsize, + psecdesc); + + if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) { + err = WERR_NOT_ENOUGH_MEMORY; + } else if (!NT_STATUS_IS_OK(status)) { + err = WERR_REGISTRY_CORRUPT; + } + +done: + TALLOC_FREE(tmp_ctx); + return err; +} + +struct regdb_set_secdesc_ctx { + const char *key; + struct security_descriptor *secdesc; +}; + +static NTSTATUS regdb_set_secdesc_action(struct db_context *db, + void *private_data) +{ + char *tdbkey; + NTSTATUS status; + TDB_DATA tdbdata; + struct regdb_set_secdesc_ctx *ctx = + (struct regdb_set_secdesc_ctx *)private_data; + TALLOC_CTX *frame = talloc_stackframe(); + + tdbkey = talloc_asprintf(frame, "%s\\%s", REG_SECDESC_PREFIX, ctx->key); + if (tdbkey == NULL) { + status = NT_STATUS_NO_MEMORY; + goto done; + } + + tdbkey = normalize_reg_path(frame, tdbkey); + if (tdbkey == NULL) { + status = NT_STATUS_NO_MEMORY; + goto done; + } + + if (ctx->secdesc == NULL) { + /* assuming a delete */ + status = dbwrap_delete_bystring(db, tdbkey); + goto done; + } + + status = marshall_sec_desc(frame, ctx->secdesc, &tdbdata.dptr, + &tdbdata.dsize); + if (!NT_STATUS_IS_OK(status)) { + goto done; + } + + status = dbwrap_store_bystring(db, tdbkey, tdbdata, 0); + +done: + TALLOC_FREE(frame); + return status; +} + +static WERROR regdb_set_secdesc(const char *key, + struct security_descriptor *secdesc) +{ + WERROR err; + struct regdb_set_secdesc_ctx ctx; + + if (!regdb_key_exists(regdb, key)) { + err = WERR_FILE_NOT_FOUND; + goto done; + } + + ctx.key = key; + ctx.secdesc = secdesc; + + err = regdb_trans_do(regdb, regdb_set_secdesc_action, &ctx); + +done: + return err; +} + +static bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys) +{ + return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys)); +} + +static bool regdb_values_need_update(struct regval_ctr *values) +{ + return (regdb_get_seqnum() != regval_ctr_get_seqnum(values)); +} + +/* + * Table of function pointers for default access + */ + +struct registry_ops regdb_ops = { + .fetch_subkeys = regdb_fetch_keys, + .fetch_values = regdb_fetch_values, + .store_subkeys = regdb_store_keys, + .store_values = regdb_store_values, + .create_subkey = regdb_create_subkey, + .delete_subkey = regdb_delete_subkey, + .get_secdesc = regdb_get_secdesc, + .set_secdesc = regdb_set_secdesc, + .subkeys_need_update = regdb_subkeys_need_update, + .values_need_update = regdb_values_need_update +}; 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