mirror of
https://github.com/samba-team/samba.git
synced 2024-12-24 21:34:56 +03:00
r10020: Support for malloc / realloc / free in HBIN blocks
Initial support for adding keys (still broken though)
(This used to be commit ff8d3a27c1)
This commit is contained in:
Jelmer Vernooij
Gerald (Jerry) Carter
parent
16788f27a8
commit
23e6e07b28
@ -409,6 +409,11 @@ WERROR reg_key_add_name(TALLOC_CTX *mem_ctx, struct registry_key *parent, const
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error = parent->hive->functions->add_key(mem_ctx, parent, name, access_mask, desc, newkey);
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if(!W_ERROR_IS_OK(error)) return error;
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if (!*newkey) {
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DEBUG(0, ("Backend returned WERR_OK, but didn't specify key!\n"));
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return WERR_GENERAL_FAILURE;
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}
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(*newkey)->hive = parent->hive;
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(*newkey)->backend_data = talloc_asprintf(mem_ctx, "%s\\%s", parent->path, name);
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@ -20,6 +20,7 @@
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#include "includes.h"
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#include "registry.h"
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#include "system/filesys.h"
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#include "system/time.h"
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#include "lib/registry/tdr_regf.h"
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#include "librpc/gen_ndr/ndr_security.h"
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@ -32,6 +33,23 @@ struct regf_data {
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struct hbin_block **hbins;
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};
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static struct hbin_block *hbin_by_offset (const struct regf_data *data, uint32_t offset, uint32_t *rel_offset)
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{
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int i;
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for (i = 0; data->hbins[i]; i++) {
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if (offset >= data->hbins[i]->offset_from_first &&
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offset < data->hbins[i]->offset_from_first+
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data->hbins[i]->offset_to_next) {
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if (rel_offset)
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*rel_offset = offset - data->hbins[i]->offset_from_first - 0x20;
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return data->hbins[i];
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}
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}
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return NULL;
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}
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/*
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* Validate a regf header
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* For now, do nothing, but we should check the checksum
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@ -49,37 +67,216 @@ static uint32_t regf_hdr_checksum(const uint8_t *buffer)
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return checksum;
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}
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static DATA_BLOB regf_get_data(const struct regf_data *data, uint32_t offset)
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static DATA_BLOB hbin_get_data(const struct regf_data *data, uint32_t offset)
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{
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int i;
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DATA_BLOB ret;
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struct hbin_block *hbin;
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uint32_t rel_offset;
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ret.data = NULL;
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ret.length = 0;
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for (i = 0; data->hbins[i]; i++) {
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if (offset >= data->hbins[i]->offset_from_first &&
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offset < data->hbins[i]->offset_from_first+
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data->hbins[i]->offset_to_next)
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break;
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}
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if (data->hbins[i] == NULL) {
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hbin = hbin_by_offset(data, offset, &rel_offset);
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if (hbin == NULL) {
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DEBUG(1, ("Can't find HBIN containing 0x%4x\n", offset));
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return ret;
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}
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ret.length = IVAL(data->hbins[i]->data,
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offset - data->hbins[i]->offset_from_first - 0x20);
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ret.length = IVAL(hbin->data, rel_offset);
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if (ret.length & 0x80000000) {
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/* absolute value */
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ret.length = (ret.length ^ 0xffffffff) + 1;
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}
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ret.data = data->hbins[i]->data +
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(offset - data->hbins[i]->offset_from_first - 0x20) + 4;
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ret.length -= 4; /* 4 bytes for the length... */
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ret.data = hbin->data +
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(offset - hbin->offset_from_first - 0x20) + 4;
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return ret;
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}
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/* Allocate some new data */
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static DATA_BLOB hbin_alloc (struct regf_data *data, uint32_t size, uint32_t *offset)
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{
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DATA_BLOB ret;
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uint32_t rel_offset = -1; /* Relative offset ! */
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struct hbin_block *hbin = NULL;
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int i;
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size += 4; /* Need to include uint32 for the length */
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/* Allocate as a multiple of 8 */
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size = (size + 7) & ~7;
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ret.data = NULL;
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ret.length = 0;
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if (size == 0)
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return ret;
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for (i = 0; (hbin = data->hbins[i]); i++) {
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int j;
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uint32_t my_size;
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for (j = 0; j < hbin->offset_to_next-0x20; j+= my_size) {
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my_size = IVAL(hbin->data, j);
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uint32_t header = IVAL(hbin->data, j + 4);
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if (my_size % 8 != 0) {
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DEBUG(0, ("Encountered non-aligned block!\n"));
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}
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if (my_size & 0x80000000) { /* Used... */
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my_size = (my_size ^ 0xffffffff) + 1;
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} else if (my_size == size) { /* exact match */
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rel_offset = j;
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break;
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} else if (my_size > size) { /* data will remain */
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rel_offset = j;
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SIVAL(hbin->data, rel_offset+size, my_size-size);
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break;
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}
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if (header == 0xffffffff &&
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hbin->offset_to_next-rel_offset >= size) {
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rel_offset = j;
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/* Mark new free block size */
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SIVAL(hbin->data, rel_offset+size,hbin->offset_to_next - rel_offset - size - 0x20);
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SIVAL(hbin->data, rel_offset+size+0x4, 0xffffffff);
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break;
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}
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if (header == 0xffffffff) {
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break;
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}
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}
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if (rel_offset != -1)
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break;
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}
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/* No space available in previous hbins,
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* allocate new one */
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if (data->hbins[i] == NULL) {
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data->hbins = talloc_realloc(data, data->hbins, struct hbin_block *, i+2);
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hbin = talloc(data->hbins, struct hbin_block);
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data->hbins[i] = hbin;
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data->hbins[i+1] = NULL;
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hbin->HBIN_ID = talloc_strdup(hbin, "hbin");
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hbin->offset_from_first = (i == 0?0:data->hbins[i-1]->offset_from_first+data->hbins[i-1]->offset_to_next);
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hbin->offset_to_next = 0x1000;
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hbin->unknown[0] = 0;
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hbin->unknown[0] = 0;
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unix_to_nt_time(&hbin->last_change, time(NULL));
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hbin->block_size = hbin->offset_to_next;
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hbin->data = talloc_zero_array(hbin, uint8_t, hbin->block_size - 0x20);
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rel_offset = 0x0;
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SIVAL(hbin->data, size, hbin->block_size - size - 0x20);
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SIVAL(hbin->data, size + 0x4, 0xffffffff);
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}
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/* Set size and mark as used */
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SIVAL(hbin->data, rel_offset, size & 0x80000000);
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ret.data = hbin->data + rel_offset + 0x4; /* Skip past length */
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ret.length = size - 0x4;
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if (offset)
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*offset = hbin->offset_from_first + rel_offset + 0x20;
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return ret;
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}
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/* Store a data blob. Return the offset at which it was stored */
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static uint32_t hbin_store (struct regf_data *data, DATA_BLOB blob)
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{
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uint32_t ret;
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DATA_BLOB dest = hbin_alloc(data, blob.length, &ret);
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memcpy(dest.data, blob.data, blob.length);
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return ret;
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}
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/* Free existing data */
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static void hbin_free (struct regf_data *data, uint32_t offset)
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{
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uint32_t size;
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uint32_t rel_offset;
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struct hbin_block *hbin = hbin_by_offset(data, offset, &rel_offset);
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if (hbin == NULL)
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return;
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/* Get original size */
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size = IVAL(hbin->data, rel_offset);
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if (!(size & 0x80000000)) {
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DEBUG(1, ("Trying to free already freed block\n"));
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return;
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}
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/* Mark block as free */
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SIVAL(hbin->data, rel_offset, (size ^ 0xffffffff) + 1);
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}
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/* Store a data blob data was already stored, but hsa changed in size
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* Will try to save it at the current location if possible, otherwise
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* does a free + store */
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static uint32_t hbin_store_resize (struct regf_data *data, uint32_t orig_offset, DATA_BLOB blob)
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{
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uint32_t rel_offset;
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struct hbin_block *hbin = hbin_by_offset(data, orig_offset, &rel_offset);
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uint32_t orig_size;
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uint32_t needed_size;
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uint32_t possible_size;
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int i;
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if (!hbin)
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return hbin_store(data, blob);
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/* Get original size */
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orig_size = IVAL(hbin->data, rel_offset);
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/* Fits into current allocated block */
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if (orig_size - 4 >= blob.length) {
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memcpy(hbin->data + rel_offset + 0x4, blob.data, blob.length);
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return orig_offset;
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}
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needed_size = blob.length + 4; /* Add uint32 containing length */
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needed_size = (needed_size + 7) & ~7; /* Align */
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possible_size = orig_size;
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/* Check if it can be combined with the next few free records */
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for (i = rel_offset;
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i < hbin->offset_to_next - 0x20;
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i = rel_offset + possible_size) {
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uint32_t header;
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if (IVAL(hbin->data, i) & 0x80000000) /* Used */
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break;
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header = IVAL(hbin->data, i + 4);
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if (header == 0xffffffff) {
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possible_size = hbin->offset_to_next - 0x20 - rel_offset;
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} else {
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possible_size += IVAL(hbin->data, i);
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}
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if (possible_size >= blob.length) {
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SIVAL(hbin->data, rel_offset, possible_size);
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memcpy(hbin->data + rel_offset + 0x4, blob.data, blob.length);
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return orig_offset;
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}
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if (header == 0xffffffff)
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break;
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}
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hbin_free(data, orig_offset);
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return hbin_store(data, blob);
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}
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static WERROR regf_num_subkeys (struct registry_key *key, uint32_t *count)
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{
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@ -101,7 +298,7 @@ static WERROR regf_num_values (struct registry_key *key, uint32_t *count)
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static struct registry_key *regf_get_key (TALLOC_CTX *ctx, struct regf_data *regf, uint32_t offset)
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{
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DATA_BLOB data = regf_get_data(regf, offset);
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DATA_BLOB data = hbin_get_data(regf, offset);
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struct tdr_pull *pull;
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struct registry_key *ret;
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struct nk_block *nk;
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@ -147,7 +344,7 @@ static WERROR regf_get_value (TALLOC_CTX *ctx, struct registry_key *key, int idx
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if (idx >= nk->num_values)
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return WERR_NO_MORE_ITEMS;
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data = regf_get_data(key->hive->backend_data, nk->values_offset);
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data = hbin_get_data(key->hive->backend_data, nk->values_offset);
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if (!data.data) {
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DEBUG(0, ("Unable to find value list\n"));
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return WERR_GENERAL_FAILURE;
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@ -159,7 +356,7 @@ static WERROR regf_get_value (TALLOC_CTX *ctx, struct registry_key *key, int idx
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vk_offset = IVAL(data.data, idx * 4);
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data = regf_get_data(key->hive->backend_data, vk_offset);
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data = hbin_get_data(key->hive->backend_data, vk_offset);
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if (!data.data) {
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DEBUG(0, ("Unable to find value\n"));
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return WERR_GENERAL_FAILURE;
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@ -188,7 +385,7 @@ static WERROR regf_get_value (TALLOC_CTX *ctx, struct registry_key *key, int idx
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(*ret)->data.data = (uint8_t *)&vk->data_offset;
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(*ret)->data.length = vk->data_length;
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} else {
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(*ret)->data = regf_get_data(key->hive->backend_data, vk->data_offset);
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(*ret)->data = hbin_get_data(key->hive->backend_data, vk->data_offset);
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}
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if ((*ret)->data.length < vk->data_length) {
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@ -207,7 +404,7 @@ static WERROR regf_get_subkey (TALLOC_CTX *ctx, struct registry_key *key, int id
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if (idx >= nk->num_subkeys)
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return WERR_NO_MORE_ITEMS;
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data = regf_get_data(key->hive->backend_data, nk->subkeys_offset);
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data = hbin_get_data(key->hive->backend_data, nk->subkeys_offset);
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if (!data.data) {
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DEBUG(0, ("Unable to find subkey list\n"));
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return WERR_GENERAL_FAILURE;
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@ -259,7 +456,7 @@ static WERROR regf_get_sec_desc(TALLOC_CTX *ctx, struct registry_key *key, struc
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struct sk_block sk;
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DATA_BLOB data;
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data = regf_get_data(key->hive->backend_data, nk->sk_offset);
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data = hbin_get_data(key->hive->backend_data, nk->sk_offset);
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if (!data.data) {
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DEBUG(0, ("Unable to find security descriptor\n"));
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return WERR_GENERAL_FAILURE;
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@ -297,6 +494,108 @@ static WERROR regf_get_sec_desc(TALLOC_CTX *ctx, struct registry_key *key, struc
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return WERR_OK;
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}
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static uint32_t lf_add_entry (struct regf_data *regf, uint32_t list_offset, const char *name, uint32_t key_offset)
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{
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uint32_t ret;
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struct lf_block lf;
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struct tdr_pull *pull = NULL;
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struct tdr_push *push;
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/* Add to subkeys list */
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if (list_offset == -1) { /* Need to create subkeys list */
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lf.header = "lf";
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lf.key_count = 0;
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lf.hr = NULL;
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} else {
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DATA_BLOB data;
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pull = talloc(regf, struct tdr_pull);
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data = hbin_get_data(regf, list_offset);
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if (!data.data) {
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DEBUG(0, ("Can't get subkeys list\n"));
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talloc_free(pull);
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return -1;
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}
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if (NT_STATUS_IS_ERR(tdr_pull_lf_block(pull, &lf))) {
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DEBUG(0, ("Unable to parse lf list\n"));
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talloc_free(pull);
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return -1;
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}
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}
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lf.hr = talloc_realloc(pull, lf.hr, struct hash_record, lf.key_count+1);
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lf.hr[lf.key_count].nk_off = key_offset;
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lf.hr[lf.key_count].hash = name;
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push = talloc_zero(regf, struct tdr_push);
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if (NT_STATUS_IS_ERR(tdr_push_lf_block(push, &lf))) {
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DEBUG(0, ("Error storing lf block\n"));
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return -1;
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}
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ret = hbin_store_resize (regf, list_offset, push->data);
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talloc_free(push);
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talloc_free(pull);
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return ret;
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}
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static WERROR regf_add_key (TALLOC_CTX *ctx, struct registry_key *parent, const char *name, uint32_t access_mask, struct security_descriptor *sec_desc, struct registry_key **ret)
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{
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struct nk_block *parent_nk = parent->backend_data, nk;
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DATA_BLOB data;
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struct tdr_push *push;
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uint32_t offset;
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nk.header = "nk";
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nk.type = REG_SUB_KEY;
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unix_to_nt_time(&nk.last_change, time(NULL));
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nk.uk1 = 0;
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nk.parent_offset = 0; /* FIXME */
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nk.num_subkeys = 0;
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nk.uk2 = 0;
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nk.subkeys_offset = -1;
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nk.unknown_offset = -1;
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nk.num_values = 0;
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nk.sk_offset = 0;
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memset(nk.unk3, 0, 5);
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nk.clsname_offset = -1;
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nk.clsname_length = 0;
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nk.key_name = name;
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push = talloc_zero(ctx, struct tdr_push);
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if (NT_STATUS_IS_ERR(tdr_push_nk_block(push, &nk))) {
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DEBUG(0, ("Error storing 'nk' block\n"));
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return WERR_GENERAL_FAILURE;
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}
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offset = hbin_store(parent->hive->backend_data, push->data);
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parent_nk->subkeys_offset = lf_add_entry(parent->hive->backend_data, parent_nk->subkeys_offset, name, nk.parent_offset);
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parent_nk->num_subkeys++;
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ZERO_STRUCTP(push);
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if (NT_STATUS_IS_ERR(tdr_push_nk_block(push, parent_nk))) {
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DEBUG(0, ("Error storing parent 'nk' block\n"));
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return WERR_GENERAL_FAILURE;
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}
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data = hbin_get_data(parent->hive->backend_data, nk.parent_offset);
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memcpy(data.data, push->data.data, push->data.length);
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talloc_free(push);
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/* FIXME: Set sec desc ! */
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*ret = regf_get_key(ctx, parent->hive->backend_data, offset);
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return WERR_OK;
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}
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static WERROR nt_open_hive (struct registry_hive *h, struct registry_key **key)
|
||||
{
|
||||
struct regf_data *regf;
|
||||
@ -389,6 +688,7 @@ static struct hive_operations reg_backend_nt4 = {
|
||||
.get_subkey_by_index = regf_get_subkey,
|
||||
.get_value_by_index = regf_get_value,
|
||||
.key_get_sec_desc = regf_get_sec_desc,
|
||||
.add_key = regf_add_key,
|
||||
};
|
||||
|
||||
NTSTATUS registry_nt4_init(void)
|
||||
|
||||
@ -64,8 +64,11 @@ interface regf
|
||||
uint32 block_size; /* Block size (including the header!) */
|
||||
uint8 data[offset_to_next-0x20];
|
||||
/* data is filled with:
|
||||
uint32 length
|
||||
uint8_t data[length]
|
||||
uint32 length;
|
||||
Negative if in used, positive otherwise
|
||||
Always a multiple of 8
|
||||
uint8_t data[length];
|
||||
Free space marker if 0xffffffff
|
||||
*/
|
||||
} hbin_block;
|
||||
|
||||
@ -94,7 +97,7 @@ interface regf
|
||||
uint32 sk_offset;
|
||||
uint32 clsname_offset;
|
||||
uint32 unk3[5];
|
||||
uint16 name_length;
|
||||
[value(strlen(key_name))] uint16 name_length;
|
||||
uint16 clsname_length;
|
||||
[charset(DOS)] uint8 key_name[name_length];
|
||||
} nk_block;
|
||||
@ -137,7 +140,7 @@ interface regf
|
||||
/* The vk-record consists information to a single value (value key). */
|
||||
typedef [public,noprint] struct {
|
||||
[charset(DOS)] uint8 header[2];
|
||||
uint16 name_length;
|
||||
[value(strlen(data_name))] uint16 name_length;
|
||||
uint32 data_length; /* If top-bit set, offset contains the data */
|
||||
uint32 data_offset;
|
||||
uint32 data_type;
|
||||
@ -148,7 +151,7 @@ interface regf
|
||||
|
||||
typedef [noprint] struct {
|
||||
uint32 nk_off;
|
||||
uint8 hash[4];
|
||||
[charset(DOS)] uint8 hash[4];
|
||||
} hash_record;
|
||||
|
||||
/*
|
||||
|
||||
Loading…
Reference in New Issue
Block a user