Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1994 insertions, 0 deletions

diff --git a/source3/registry/regfio.c b/source3/registry/regfio.c
new file mode 100644
index 0000000..930ac83
--- /dev/null
+++ b/source3/registry/regfio.c
@@ -0,0 +1,1994 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * Windows NT registry I/O library
+ * Copyright (c) Gerald (Jerry) Carter               2005
+ *
+ * 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/>.  
+ */
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "regfio.h"
+#include "../librpc/gen_ndr/ndr_security.h"
+#include "../libcli/security/security_descriptor.h"
+#include "../libcli/security/secdesc.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_REGISTRY
+
+/*******************************************************************
+ *
+ * TODO : Right now this code basically ignores classnames.
+ *
+ ******************************************************************/
+
+#if defined(PARANOID_MALLOC_CHECKER)
+#define PRS_ALLOC_MEM(ps, type, count) (type *)prs_alloc_mem_((ps),sizeof(type),(count))
+#else
+#define PRS_ALLOC_MEM(ps, type, count) (type *)prs_alloc_mem((ps),sizeof(type),(count))
+#endif
+
+/*******************************************************************
+ Reads or writes an NTTIME structure.
+********************************************************************/
+
+static bool smb_io_time(const char *desc, NTTIME *nttime, prs_struct *ps, int depth)
+{
+	uint32_t low, high;
+	if (nttime == NULL)
+		return False;
+
+	prs_debug(ps, depth, desc, "smb_io_time");
+	depth++;
+
+	if(!prs_align(ps))
+		return False;
+
+	if (MARSHALLING(ps)) {
+		low = *nttime & 0xFFFFFFFF;
+		high = *nttime >> 32;
+	}
+
+	if(!prs_uint32("low ", ps, depth, &low)) /* low part */
+		return False;
+	if(!prs_uint32("high", ps, depth, &high)) /* high part */
+		return False;
+
+	if (UNMARSHALLING(ps)) {
+		*nttime = (((uint64_t)high << 32) + low);
+	}
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static int write_block( REGF_FILE *file, prs_struct *ps, uint32_t offset )
+{
+	int bytes_written, returned;
+	char *buffer = prs_data_p( ps );
+	uint32_t buffer_size = prs_data_size( ps );
+	SMB_STRUCT_STAT sbuf;
+
+	if ( file->fd == -1 )
+		return -1;
+
+	/* check for end of file */
+
+	if (sys_fstat(file->fd, &sbuf, false)) {
+		DEBUG(0,("write_block: stat() failed! (%s)\n", strerror(errno)));
+		return -1;
+	}
+
+	if ( lseek( file->fd, offset, SEEK_SET ) == -1 ) {
+		DEBUG(0,("write_block: lseek() failed! (%s)\n", strerror(errno) ));
+		return -1;
+	}
+	
+	bytes_written = returned = 0;
+	while ( bytes_written < buffer_size ) {
+		if ( (returned = write( file->fd, buffer+bytes_written, buffer_size-bytes_written )) == -1 ) {
+			DEBUG(0,("write_block: write() failed! (%s)\n", strerror(errno) ));
+			return False;
+		}
+				
+		bytes_written += returned;
+	}
+	
+	return bytes_written;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static int read_block( REGF_FILE *file, prs_struct *ps, uint32_t file_offset, uint32_t block_size )
+{
+	int bytes_read, returned;
+	char *buffer;
+	SMB_STRUCT_STAT sbuf;
+
+	/* check for end of file */
+
+	if (sys_fstat(file->fd, &sbuf, false)) {
+		DEBUG(0,("read_block: stat() failed! (%s)\n", strerror(errno)));
+		return -1;
+	}
+
+	if ( (size_t)file_offset >= sbuf.st_ex_size )
+		return -1;
+	
+	/* if block_size == 0, we are parsing HBIN records and need 
+	   to read some of the header to get the block_size from there */
+	   
+	if ( block_size == 0 ) {
+		char hdr[0x20];
+
+		if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
+			DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
+			return -1;
+		}
+
+		returned = read( file->fd, hdr, 0x20 );
+		if ( (returned == -1) || (returned < 0x20) ) {
+			DEBUG(0,("read_block: failed to read in HBIN header. Is the file corrupt?\n"));
+			return -1;
+		}
+
+		/* make sure this is an hbin header */
+
+		if ( strncmp( hdr, "hbin", HBIN_HDR_SIZE ) != 0 ) {
+			DEBUG(0,("read_block: invalid block header!\n"));
+			return -1;
+		}
+
+		block_size = IVAL( hdr, 0x08 );
+	}
+
+	DEBUG(10,("read_block: block_size == 0x%x\n", block_size ));
+
+	/* set the offset, initialize the buffer, and read the block from disk */
+
+	if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
+		DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
+		return -1;
+	}
+	
+	if (!prs_init( ps, block_size, file->mem_ctx, UNMARSHALL )) {
+		DEBUG(0,("read_block: prs_init() failed! (%s)\n", strerror(errno) ));
+		return -1;
+	}
+	buffer = prs_data_p( ps );
+	bytes_read = returned = 0;
+
+	while ( bytes_read < block_size ) {
+		if ( (returned = read( file->fd, buffer+bytes_read, block_size-bytes_read )) == -1 ) {
+			DEBUG(0,("read_block: read() failed (%s)\n", strerror(errno) ));
+			return False;
+		}
+		if ( (returned == 0) && (bytes_read < block_size) ) {
+			DEBUG(0,("read_block: not a valid registry file ?\n" ));
+			return False;
+		}	
+		
+		bytes_read += returned;
+	}
+	
+	return bytes_read;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool write_hbin_block( REGF_FILE *file, REGF_HBIN *hbin )
+{
+	if ( !hbin->dirty )
+		return True;
+
+	/* write free space record if any is available */
+
+	if ( hbin->free_off != REGF_OFFSET_NONE ) {
+		uint32_t header = 0xffffffff;
+
+		if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32_t) ) )
+			return False;
+		if ( !prs_uint32( "free_size", &hbin->ps, 0, &hbin->free_size ) )
+			return False;
+		if ( !prs_uint32( "free_header", &hbin->ps, 0, &header ) )
+			return False;
+	}
+
+	hbin->dirty = (write_block( file, &hbin->ps, hbin->file_off ) != -1);
+
+	return hbin->dirty;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool hbin_block_close( REGF_FILE *file, REGF_HBIN *hbin )
+{
+	REGF_HBIN *p;
+
+	/* remove the block from the open list and flush it to disk */
+
+	for ( p=file->block_list; p && p!=hbin; p=p->next )
+		;
+
+	if ( p == hbin ) {
+		DLIST_REMOVE( file->block_list, hbin );
+	}
+	else
+		DEBUG(0,("hbin_block_close: block not in open list!\n"));
+
+	if ( !write_hbin_block( file, hbin ) )
+		return False;
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool prs_regf_block( const char *desc, prs_struct *ps, int depth, REGF_FILE *file )
+{
+	prs_debug(ps, depth, desc, "prs_regf_block");
+	depth++;
+	
+	if ( !prs_uint8s( True, "header", ps, depth, (uint8_t *)file->header, sizeof( file->header )) )
+		return False;
+	
+	/* yes, these values are always identical so store them only once */
+	
+	if ( !prs_uint32( "unknown1", ps, depth, &file->unknown1 ))
+		return False;
+	if ( !prs_uint32( "unknown1 (again)", ps, depth, &file->unknown1 ))
+		return False;
+
+	/* get the modtime */
+	
+	if ( !prs_set_offset( ps, 0x0c ) )
+		return False;
+	if ( !smb_io_time( "modtime", &file->mtime, ps, depth ) )
+		return False;
+
+	/* constants */
+	
+	if ( !prs_uint32( "unknown2", ps, depth, &file->unknown2 ))
+		return False;
+	if ( !prs_uint32( "unknown3", ps, depth, &file->unknown3 ))
+		return False;
+	if ( !prs_uint32( "unknown4", ps, depth, &file->unknown4 ))
+		return False;
+	if ( !prs_uint32( "unknown5", ps, depth, &file->unknown5 ))
+		return False;
+
+	/* get file offsets */
+	
+	if ( !prs_set_offset( ps, 0x24 ) )
+		return False;
+	if ( !prs_uint32( "data_offset", ps, depth, &file->data_offset ))
+		return False;
+	if ( !prs_uint32( "last_block", ps, depth, &file->last_block ))
+		return False;
+		
+	/* one more constant */
+	
+	if ( !prs_uint32( "unknown6", ps, depth, &file->unknown6 ))
+		return False;
+		
+	/* get the checksum */
+	
+	if ( !prs_set_offset( ps, 0x01fc ) )
+		return False;
+	if ( !prs_uint32( "checksum", ps, depth, &file->checksum ))
+		return False;
+	
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool prs_hbin_block( const char *desc, prs_struct *ps, int depth, REGF_HBIN *hbin )
+{
+	uint32_t block_size2;
+
+	prs_debug(ps, depth, desc, "prs_hbin_block");
+	depth++;
+	
+	if ( !prs_uint8s( True, "header", ps, depth, (uint8_t*)hbin->header, sizeof( hbin->header )) )
+		return False;
+
+	if ( !prs_uint32( "first_hbin_off", ps, depth, &hbin->first_hbin_off ))
+		return False;
+
+	/* The dosreg.cpp comments say that the block size is at 0x1c.
+	   According to a WINXP NTUSER.dat file, this is wrong.  The block_size
+	   is at 0x08 */
+
+	if ( !prs_uint32( "block_size", ps, depth, &hbin->block_size ))
+		return False;
+
+	block_size2 = hbin->block_size;
+	prs_set_offset( ps, 0x1c );
+	if ( !prs_uint32( "block_size2", ps, depth, &block_size2 ))
+		return False;
+
+	if ( MARSHALLING(ps) )
+		hbin->dirty = True;
+	
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool prs_nk_rec( const char *desc, prs_struct *ps, int depth, REGF_NK_REC *nk )
+{
+	uint16_t class_length, name_length;
+	uint32_t start;
+	uint32_t data_size, start_off, end_off;
+	uint32_t unknown_off = REGF_OFFSET_NONE;
+
+	nk->hbin_off = prs_offset( ps );
+	start = nk->hbin_off;
+	
+	prs_debug(ps, depth, desc, "prs_nk_rec");
+	depth++;
+	
+	/* back up and get the data_size */
+	
+	if ( !prs_set_offset( ps, prs_offset(ps)-sizeof(uint32_t)) )
+		return False;
+	start_off = prs_offset( ps );
+	if ( !prs_uint32( "rec_size", ps, depth, &nk->rec_size ))
+		return False;
+	
+	if ( !prs_uint8s( True, "header", ps, depth, (uint8_t *)nk->header, sizeof( nk->header )) )
+		return False;
+		
+	if ( !prs_uint16( "key_type", ps, depth, &nk->key_type ))
+		return False;
+	if ( !smb_io_time( "mtime", &nk->mtime, ps, depth ))
+		return False;
+		
+	if ( !prs_set_offset( ps, start+0x0010 ) )
+		return False;
+	if ( !prs_uint32( "parent_off", ps, depth, &nk->parent_off ))
+		return False;
+	if ( !prs_uint32( "num_subkeys", ps, depth, &nk->num_subkeys ))
+		return False;
+		
+	if ( !prs_set_offset( ps, start+0x001c ) )
+		return False;
+	if ( !prs_uint32( "subkeys_off", ps, depth, &nk->subkeys_off ))
+		return False;
+	if ( !prs_uint32( "unknown_off", ps, depth, &unknown_off) )
+		return False;
+		
+	if ( !prs_set_offset( ps, start+0x0024 ) )
+		return False;
+	if ( !prs_uint32( "num_values", ps, depth, &nk->num_values ))
+		return False;
+	if ( !prs_uint32( "values_off", ps, depth, &nk->values_off ))
+		return False;
+	if ( !prs_uint32( "sk_off", ps, depth, &nk->sk_off ))
+		return False;
+	if ( !prs_uint32( "classname_off", ps, depth, &nk->classname_off ))
+		return False;
+
+	if ( !prs_uint32( "max_bytes_subkeyname", ps, depth, &nk->max_bytes_subkeyname))
+		return False;
+	if ( !prs_uint32( "max_bytes_subkeyclassname", ps, depth, &nk->max_bytes_subkeyclassname))
+		return False;
+	if ( !prs_uint32( "max_bytes_valuename", ps, depth, &nk->max_bytes_valuename))
+		return False;
+	if ( !prs_uint32( "max_bytes_value", ps, depth, &nk->max_bytes_value))
+		return False;
+	if ( !prs_uint32( "unknown index", ps, depth, &nk->unk_index))
+		return False;
+
+	name_length = nk->keyname ? strlen(nk->keyname) : 0 ;
+	class_length = nk->classname ? strlen(nk->classname) : 0 ;
+	if ( !prs_uint16( "name_length", ps, depth, &name_length ))
+		return False;
+	if ( !prs_uint16( "class_length", ps, depth, &class_length ))
+		return False;	
+		
+	if ( class_length ) {
+		;;
+	}
+	
+	if ( name_length ) {
+		if ( UNMARSHALLING(ps) ) {
+			if ( !(nk->keyname = PRS_ALLOC_MEM( ps, char, name_length+1 )) )
+				return False;
+		}
+
+		if ( !prs_uint8s( True, "name", ps, depth, (uint8_t *)nk->keyname, name_length) )
+			return False;
+
+		if ( UNMARSHALLING(ps) ) 
+			nk->keyname[name_length] = '\0';
+	}
+
+	end_off = prs_offset( ps );
+
+	/* data_size must be divisible by 8 and large enough to hold the original record */
+
+	data_size = ((start_off - end_off) & 0xfffffff8 );
+	if ( data_size > nk->rec_size )
+		DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, nk->rec_size));
+
+	if ( MARSHALLING(ps) )
+		nk->hbin->dirty = True;
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static uint32_t regf_block_checksum( prs_struct *ps )
+{
+	char *buffer = prs_data_p( ps );
+	uint32_t checksum, x;
+	int i;
+
+	/* XOR of all bytes 0x0000 - 0x01FB */
+		
+	checksum = x = 0;
+	
+	for ( i=0; i<0x01FB; i+=4 ) {
+		x = IVAL(buffer, i );
+		checksum ^= x;
+	}
+	
+	return checksum;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool read_regf_block( REGF_FILE *file )
+{
+	prs_struct ps;
+	uint32_t checksum;
+	
+	/* grab the first block from the file */
+		
+	if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) == -1 )
+		return False;
+	
+	/* parse the block and verify the checksum */
+	
+	if ( !prs_regf_block( "regf_header", &ps, 0, file ) )
+		return False;	
+		
+	checksum = regf_block_checksum( &ps );
+	
+	prs_mem_free( &ps );
+	
+	if ( file->checksum != checksum && !file->ignore_checksums) {
+		DEBUG(0,("read_regf_block: invalid checksum\n" ));
+		return False;
+	}
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static REGF_HBIN* read_hbin_block( REGF_FILE *file, off_t offset )
+{
+	REGF_HBIN *hbin;
+	uint32_t record_size, curr_off, block_size, header;
+	
+	if ( !(hbin = talloc_zero(file->mem_ctx, REGF_HBIN)) ) 
+		return NULL;
+	hbin->file_off = offset;
+	hbin->free_off = -1;
+		
+	if ( read_block( file, &hbin->ps, offset, 0 ) == -1 )
+		return NULL;
+	
+	if ( !prs_hbin_block( "hbin", &hbin->ps, 0, hbin ) )
+		return NULL;	
+
+	/* this should be the same thing as hbin->block_size but just in case */
+
+	block_size = prs_data_size( &hbin->ps );	
+
+	/* Find the available free space offset.  Always at the end,
+	   so walk the record list and stop when you get to the end.
+	   The end is defined by a record header of 0xffffffff.  The 
+	   previous 4 bytes contains the amount of free space remaining 
+	   in the hbin block. */
+
+	/* remember that the record_size is in the 4 bytes preceding the record itself */
+
+	if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE-sizeof(uint32_t) ) )
+		return NULL;
+
+	record_size = 0;
+	header = 0;
+	curr_off = prs_offset( &hbin->ps );
+	while ( header != 0xffffffff ) {
+		/* not done yet so reset the current offset to the 
+		   next record_size field */
+
+		curr_off = curr_off+record_size;
+
+		/* for some reason the record_size of the last record in
+		   an hbin block can extend past the end of the block
+		   even though the record fits within the remaining 
+		   space....aaarrrgggghhhhhh */
+
+		if ( curr_off >= block_size ) {
+			record_size = -1;
+			curr_off = -1;
+			break;
+		}
+
+		if ( !prs_set_offset( &hbin->ps, curr_off) )
+			return NULL;
+
+		if ( !prs_uint32( "rec_size", &hbin->ps, 0, &record_size ) )
+			return NULL;
+		if ( !prs_uint32( "header", &hbin->ps, 0, &header ) )
+			return NULL;
+		
+		if (record_size == 0)
+			return NULL;
+
+		if ( record_size & 0x80000000 ) {
+			/* absolute_value(record_size) */
+			record_size = (record_size ^ 0xffffffff) + 1;
+		}
+	}
+
+	/* save the free space offset */
+
+	if ( header == 0xffffffff ) {
+
+		/* account for the fact that the curr_off is 4 bytes behind the actual 
+		   record header */
+
+		hbin->free_off = curr_off + sizeof(uint32_t);
+		hbin->free_size = record_size;
+	}
+
+	DEBUG(10,("read_hbin_block: free space offset == 0x%x\n", hbin->free_off));
+
+	if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE )  )
+		return NULL;
+	
+	return hbin;
+}
+
+/*******************************************************************
+ Input a random offset and receive the corresponding HBIN 
+ block for it
+*******************************************************************/
+
+static bool hbin_contains_offset( REGF_HBIN *hbin, uint32_t offset )
+{
+	if ( !hbin )
+		return False;
+	
+	if ( (offset > hbin->first_hbin_off) && (offset < (hbin->first_hbin_off+hbin->block_size)) )
+		return True;
+		
+	return False;
+}
+
+/*******************************************************************
+ Input a random offset and receive the corresponding HBIN 
+ block for it
+*******************************************************************/
+
+static REGF_HBIN* lookup_hbin_block( REGF_FILE *file, uint32_t offset )
+{
+	REGF_HBIN *hbin = NULL;
+	uint32_t block_off;
+
+	/* start with the open list */
+
+	for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
+		DEBUG(10,("lookup_hbin_block: address = 0x%x [0x%lx]\n", hbin->file_off, (unsigned long)hbin ));
+		if ( hbin_contains_offset( hbin, offset ) )
+			return hbin;
+	}
+	
+	if ( !hbin ) {
+		/* start at the beginning */
+
+		block_off = REGF_BLOCKSIZE;
+		do {
+			/* cleanup before the next round */
+			if ( hbin )
+				prs_mem_free( &hbin->ps );
+
+			hbin = read_hbin_block( file, block_off );
+
+			if ( hbin ) 
+				block_off = hbin->file_off + hbin->block_size;
+
+		} while ( hbin && !hbin_contains_offset( hbin, offset ) );
+	}
+
+	if ( hbin )
+		DLIST_ADD( file->block_list, hbin );
+
+	return hbin;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool prs_hash_rec( const char *desc, prs_struct *ps, int depth, REGF_HASH_REC *hash )
+{
+	prs_debug(ps, depth, desc, "prs_hash_rec");
+	depth++;
+
+	if ( !prs_uint32( "nk_off", ps, depth, &hash->nk_off ))
+		return False;
+	if ( !prs_uint8s( True, "keycheck", ps, depth, hash->keycheck, sizeof( hash->keycheck )) )
+		return False;
+	
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool hbin_prs_lf_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk )
+{
+	int i;
+	REGF_LF_REC *lf = &nk->subkeys;
+	uint32_t data_size, start_off, end_off;
+
+	prs_debug(&hbin->ps, depth, desc, "prs_lf_records");
+	depth++;
+
+	/* check if we have anything to do first */
+	
+	if ( nk->num_subkeys == 0 )
+		return True;
+
+	/* move to the LF record */
+
+	if ( !prs_set_offset( &hbin->ps, nk->subkeys_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
+		return False;
+
+	/* backup and get the data_size */
+	
+	if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32_t)) )
+		return False;
+	start_off = prs_offset( &hbin->ps );
+	if ( !prs_uint32( "rec_size", &hbin->ps, depth, &lf->rec_size ))
+		return False;
+
+	if ( !prs_uint8s( True, "header", &hbin->ps, depth, (uint8_t *)lf->header, sizeof( lf->header )) )
+		return False;
+		
+	if ( !prs_uint16( "num_keys", &hbin->ps, depth, &lf->num_keys))
+		return False;
+
+	if ( UNMARSHALLING(&hbin->ps) ) {
+		if (lf->num_keys) {
+			if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
+				return False;
+		} else {
+			lf->hashes = NULL;
+		}
+	}
+
+	for ( i=0; i<lf->num_keys; i++ ) {
+		if ( !prs_hash_rec( "hash_rec", &hbin->ps, depth, &lf->hashes[i] ) )
+			return False;
+	}
+
+	end_off = prs_offset( &hbin->ps );
+
+	/* data_size must be divisible by 8 and large enough to hold the original record */
+
+	data_size = ((start_off - end_off) & 0xfffffff8 );
+	if ( data_size > lf->rec_size )
+		DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, lf->rec_size));
+
+	if ( MARSHALLING(&hbin->ps) )
+		hbin->dirty = True;
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool hbin_prs_sk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_SK_REC *sk )
+{
+	prs_struct *ps = &hbin->ps;
+	uint16_t tag = 0xFFFF;
+	uint32_t data_size, start_off, end_off;
+
+
+	prs_debug(ps, depth, desc, "hbin_prs_sk_rec");
+	depth++;
+
+	if ( !prs_set_offset( &hbin->ps, sk->sk_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
+		return False;
+
+	/* backup and get the data_size */
+	
+	if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32_t)) )
+		return False;
+	start_off = prs_offset( &hbin->ps );
+	if ( !prs_uint32( "rec_size", &hbin->ps, depth, &sk->rec_size ))
+		return False;
+
+	if ( !prs_uint8s( True, "header", ps, depth, (uint8_t *)sk->header, sizeof( sk->header )) )
+		return False;
+	if ( !prs_uint16( "tag", ps, depth, &tag))
+		return False;
+
+	if ( !prs_uint32( "prev_sk_off", ps, depth, &sk->prev_sk_off))
+		return False;
+	if ( !prs_uint32( "next_sk_off", ps, depth, &sk->next_sk_off))
+		return False;
+	if ( !prs_uint32( "ref_count", ps, depth, &sk->ref_count))
+		return False;
+	if ( !prs_uint32( "size", ps, depth, &sk->size))
+		return False;
+
+	{
+		NTSTATUS status;
+		TALLOC_CTX *mem_ctx = prs_get_mem_context(&hbin->ps);
+		DATA_BLOB blob;
+
+		if (MARSHALLING(&hbin->ps)) {
+			status = marshall_sec_desc(mem_ctx,
+						   sk->sec_desc,
+						   &blob.data, &blob.length);
+			if (!NT_STATUS_IS_OK(status))
+				return False;
+			if (!prs_copy_data_in(&hbin->ps, (const char *)blob.data, blob.length))
+				return False;
+		} else {
+			blob = data_blob_const(
+				prs_data_p(&hbin->ps) + prs_offset(&hbin->ps),
+				prs_data_size(&hbin->ps) - prs_offset(&hbin->ps)
+			       );
+			status = unmarshall_sec_desc(mem_ctx,
+						     blob.data, blob.length,
+						     &sk->sec_desc);
+			if (!NT_STATUS_IS_OK(status))
+				return False;
+			prs_set_offset(&hbin->ps, blob.length);
+		}
+	}
+
+	end_off = prs_offset( &hbin->ps );
+
+	/* data_size must be divisible by 8 and large enough to hold the original record */
+
+	data_size = ((start_off - end_off) & 0xfffffff8 );
+	if ( data_size > sk->rec_size )
+		DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, sk->rec_size));
+
+	if ( MARSHALLING(&hbin->ps) )
+		hbin->dirty = True;
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool hbin_prs_vk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_VK_REC *vk, REGF_FILE *file )
+{
+	uint32_t offset;
+	uint16_t name_length;
+	prs_struct *ps = &hbin->ps;
+	uint32_t data_size, start_off, end_off;
+
+	prs_debug(ps, depth, desc, "prs_vk_rec");
+	depth++;
+
+	/* backup and get the data_size */
+	
+	if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32_t)) )
+		return False;
+	start_off = prs_offset( &hbin->ps );
+	if ( !prs_uint32( "rec_size", &hbin->ps, depth, &vk->rec_size ))
+		return False;
+
+	if ( !prs_uint8s( True, "header", ps, depth, (uint8_t *)vk->header, sizeof( vk->header )) )
+		return False;
+
+	if ( MARSHALLING(&hbin->ps) )
+		name_length = strlen(vk->valuename);
+
+	if ( !prs_uint16( "name_length", ps, depth, &name_length ))
+		return False;
+	if ( !prs_uint32( "data_size", ps, depth, &vk->data_size ))
+		return False;
+	if ( !prs_uint32( "data_off", ps, depth, &vk->data_off ))
+		return False;
+	if ( !prs_uint32( "type", ps, depth, &vk->type))
+		return False;
+	if ( !prs_uint16( "flag", ps, depth, &vk->flag))
+		return False;
+
+	offset = prs_offset( ps );
+	offset += 2;	/* skip 2 bytes */
+	prs_set_offset( ps, offset );
+
+	/* get the name */
+
+	if ( vk->flag&VK_FLAG_NAME_PRESENT ) {
+
+		if ( UNMARSHALLING(&hbin->ps) ) {
+			if ( !(vk->valuename = PRS_ALLOC_MEM( ps, char, name_length+1 )))
+				return False;
+		}
+		if ( !prs_uint8s( True, "name", ps, depth, (uint8_t *)vk->valuename, name_length ) )
+			return False;
+	}
+
+	end_off = prs_offset( &hbin->ps );
+
+	/* get the data if necessary */
+
+	if ( vk->data_size != 0 ) {
+		bool charmode = False;
+
+		if ( (vk->type == REG_SZ) || (vk->type == REG_MULTI_SZ) )
+			charmode = True;
+
+		/* the data is stored in the offset if the size <= 4 */
+
+		if ( !(vk->data_size & VK_DATA_IN_OFFSET) ) {
+			REGF_HBIN *hblock = hbin;
+			uint32_t data_rec_size;
+
+			if ( UNMARSHALLING(&hbin->ps) ) {
+				if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8_t, vk->data_size) ) )
+					return False;
+			}
+
+			/* this data can be in another hbin */
+			if ( !hbin_contains_offset( hbin, vk->data_off ) ) {
+				if ( !(hblock = lookup_hbin_block( file, vk->data_off )) )
+					return False;
+			}
+			if ( !(prs_set_offset( &hblock->ps, (vk->data_off+HBIN_HDR_SIZE-hblock->first_hbin_off)-sizeof(uint32_t) )) )
+				return False;
+
+			if ( MARSHALLING(&hblock->ps) ) {
+				data_rec_size = ( (vk->data_size+sizeof(uint32_t)) & 0xfffffff8 ) + 8;
+				data_rec_size = ( data_rec_size - 1 ) ^ 0xFFFFFFFF;
+			}
+			if ( !prs_uint32( "data_rec_size", &hblock->ps, depth, &data_rec_size ))
+				return False;
+			if ( !prs_uint8s( charmode, "data", &hblock->ps, depth, vk->data, vk->data_size) )
+				return False;
+
+			if ( MARSHALLING(&hblock->ps) )
+				hblock->dirty = True;
+		}
+		else {
+			if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8_t, 4 ) ) )
+				return False;
+			SIVAL( vk->data, 0, vk->data_off );
+		}
+		
+	}
+
+	/* data_size must be divisible by 8 and large enough to hold the original record */
+
+	data_size = ((start_off - end_off ) & 0xfffffff8 );
+	if ( data_size !=  vk->rec_size )
+		DEBUG(10,("prs_vk_rec: data_size check failed (0x%x < 0x%x)\n", data_size, vk->rec_size));
+
+	if ( MARSHALLING(&hbin->ps) )
+		hbin->dirty = True;
+
+	return True;
+}
+
+/*******************************************************************
+ read a VK record which is contained in the HBIN block stored 
+ in the prs_struct *ps.
+*******************************************************************/
+
+static bool hbin_prs_vk_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk, REGF_FILE *file )
+{
+	int i;
+	uint32_t record_size;
+
+	prs_debug(&hbin->ps, depth, desc, "prs_vk_records");
+	depth++;
+	
+	/* check if we have anything to do first */
+	
+	if ( nk->num_values == 0 )
+		return True;
+		
+	if ( UNMARSHALLING(&hbin->ps) ) {
+		if ( !(nk->values = PRS_ALLOC_MEM( &hbin->ps, REGF_VK_REC, nk->num_values ) ) )
+			return False;
+	}
+	
+	/* convert the offset to something relative to this HBIN block */
+	
+	if ( !prs_set_offset( &hbin->ps, nk->values_off+HBIN_HDR_SIZE-hbin->first_hbin_off-sizeof(uint32_t)) )
+		return False;
+
+	if ( MARSHALLING( &hbin->ps) ) { 
+		record_size = ( ( nk->num_values * sizeof(uint32_t) ) & 0xfffffff8 ) + 8;
+		record_size = (record_size - 1) ^ 0xFFFFFFFF;
+	}
+
+	if ( !prs_uint32( "record_size", &hbin->ps, depth, &record_size ) )
+		return False;
+		
+	for ( i=0; i<nk->num_values; i++ ) {
+		if ( !prs_uint32( "vk_off", &hbin->ps, depth, &nk->values[i].rec_off ) )
+			return False;
+	}
+
+	for ( i=0; i<nk->num_values; i++ ) {
+		REGF_HBIN *sub_hbin = hbin;
+		uint32_t new_offset;
+	
+		if ( !hbin_contains_offset( hbin, nk->values[i].rec_off ) ) {
+			sub_hbin = lookup_hbin_block( file, nk->values[i].rec_off );
+			if ( !sub_hbin ) {
+				DEBUG(0,("hbin_prs_vk_records: Failed to find HBIN block containing offset [0x%x]\n", 
+					nk->values[i].hbin_off));
+				return False;
+			}
+		}
+		
+		new_offset = nk->values[i].rec_off + HBIN_HDR_SIZE - sub_hbin->first_hbin_off;
+		if ( !prs_set_offset( &sub_hbin->ps, new_offset ) )
+			return False;
+		if ( !hbin_prs_vk_rec( "vk_rec", sub_hbin, depth, &nk->values[i], file ) )
+			return False;
+	}
+
+	if ( MARSHALLING(&hbin->ps) )
+		hbin->dirty = True;
+
+
+	return True;
+}
+
+
+/*******************************************************************
+*******************************************************************/
+
+static REGF_SK_REC* find_sk_record_by_offset( REGF_FILE *file, uint32_t offset )
+{
+	REGF_SK_REC *p_sk;
+	
+	for ( p_sk=file->sec_desc_list; p_sk; p_sk=p_sk->next ) {
+		if ( p_sk->sk_off == offset ) 
+			return p_sk;
+	}
+	
+	return NULL;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static REGF_SK_REC* find_sk_record_by_sec_desc( REGF_FILE *file, struct security_descriptor *sd )
+{
+	REGF_SK_REC *p;
+
+	for ( p=file->sec_desc_list; p; p=p->next ) {
+		if ( security_descriptor_equal( p->sec_desc, sd ) )
+			return p;
+	}
+
+	/* failure */
+
+	return NULL;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool hbin_prs_key( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk )
+{
+	int depth = 0;
+	REGF_HBIN *sub_hbin;
+	
+	prs_debug(&hbin->ps, depth, "", "prs_key");
+	depth++;
+
+	/* get the initial nk record */
+	
+	if ( !prs_nk_rec( "nk_rec", &hbin->ps, depth, nk ))
+		return False;
+
+	/* fill in values */
+	
+	if ( nk->num_values && (nk->values_off!=REGF_OFFSET_NONE) ) {
+		sub_hbin = hbin;
+		if ( !hbin_contains_offset( hbin, nk->values_off ) ) {
+			sub_hbin = lookup_hbin_block( file, nk->values_off );
+			if ( !sub_hbin ) {
+				DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing value_list_offset [0x%x]\n", 
+					nk->values_off));
+				return False;
+			}
+		}
+		
+		if ( !hbin_prs_vk_records( "vk_rec", sub_hbin, depth, nk, file ))
+			return False;
+	}
+		
+	/* now get subkeys */
+	
+	if ( nk->num_subkeys && (nk->subkeys_off!=REGF_OFFSET_NONE) ) {
+		sub_hbin = hbin;
+		if ( !hbin_contains_offset( hbin, nk->subkeys_off ) ) {
+			sub_hbin = lookup_hbin_block( file, nk->subkeys_off );
+			if ( !sub_hbin ) {
+				DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing subkey_offset [0x%x]\n", 
+					nk->subkeys_off));
+				return False;
+			}
+		}
+		
+		if ( !hbin_prs_lf_records( "lf_rec", sub_hbin, depth, nk ))
+			return False;
+	}
+
+	/* get the to the security descriptor.  First look if we have already parsed it */
+	
+	if ( (nk->sk_off!=REGF_OFFSET_NONE) && !( nk->sec_desc = find_sk_record_by_offset( file, nk->sk_off )) ) {
+
+		sub_hbin = hbin;
+		if ( !hbin_contains_offset( hbin, nk->sk_off ) ) {
+			sub_hbin = lookup_hbin_block( file, nk->sk_off );
+			if ( !sub_hbin ) {
+				DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing sk_off [0x%x]\n",
+					nk->sk_off));
+				return False;
+			}
+		}
+		
+		if ( !(nk->sec_desc = talloc_zero( file->mem_ctx, REGF_SK_REC )) )
+			return False;
+		nk->sec_desc->sk_off = nk->sk_off;
+		if ( !hbin_prs_sk_rec( "sk_rec", sub_hbin, depth, nk->sec_desc ))
+			return False;
+			
+		/* add to the list of security descriptors (ref_count has been read from the files) */
+
+		nk->sec_desc->sk_off = nk->sk_off;
+		DLIST_ADD( file->sec_desc_list, nk->sec_desc );
+	}
+		
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool next_record( REGF_HBIN *hbin, const char *hdr, bool *eob )
+{
+	uint8_t header[REC_HDR_SIZE];
+	uint32_t record_size;
+	uint32_t curr_off, block_size;
+	bool found = False;
+	prs_struct *ps = &hbin->ps;
+	
+	curr_off = prs_offset( ps );
+	if ( curr_off == 0 )
+		prs_set_offset( ps, HBIN_HEADER_REC_SIZE );
+
+	/* assume that the current offset is at the record header 
+	   and we need to backup to read the record size */
+
+	curr_off -= sizeof(uint32_t);
+
+	block_size = prs_data_size( ps );
+	record_size = 0;
+	memset( header, 0x0, sizeof(uint8_t)*REC_HDR_SIZE );
+	while ( !found ) {
+
+		curr_off = curr_off+record_size;
+		if ( curr_off >= block_size ) 
+			break;
+
+		if ( !prs_set_offset( &hbin->ps, curr_off) )
+			return False;
+
+		if ( !prs_uint32( "record_size", ps, 0, &record_size ) )
+			return False;
+		if ( !prs_uint8s( True, "header", ps, 0, header, REC_HDR_SIZE ) )
+			return False;
+
+		if (record_size & 0x80000000) {
+			/* absolute_value(record_size) */
+			record_size = (record_size ^ 0xffffffff) + 1;
+		}
+
+		if (record_size < sizeof(REC_HDR_SIZE)) {
+			return false;
+		}
+
+		if (memcmp(header, hdr, REC_HDR_SIZE) == 0) {
+			found = True;
+			curr_off += sizeof(uint32_t);
+		}
+	} 
+
+	/* mark prs_struct as done ( at end ) if no more SK records */
+	/* mark end-of-block as True */
+	
+	if ( !found ) {
+		prs_set_offset( &hbin->ps, prs_data_size(&hbin->ps) );
+		*eob = True;
+		return False;
+	}
+		
+	if ( !prs_set_offset( ps, curr_off ) )
+		return False;
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool next_nk_record( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk, bool *eob )
+{
+	if ( next_record( hbin, "nk", eob ) && hbin_prs_key( file, hbin, nk ) )
+		return True;
+	
+	return False;
+}
+
+/*******************************************************************
+ Intialize the newly created REGF_BLOCK in *file and write the 
+ block header to disk 
+*******************************************************************/
+
+static bool init_regf_block( REGF_FILE *file )
+{	
+	prs_struct ps;
+	bool result = True;
+	
+	if ( !prs_init( &ps, REGF_BLOCKSIZE, file->mem_ctx, MARSHALL ) )
+		return False;
+		
+	memcpy( file->header, "regf", REGF_HDR_SIZE );
+	file->data_offset = 0x20;
+	file->last_block  = 0x1000;
+	
+	/* set mod time */
+	
+	unix_to_nt_time( &file->mtime, time(NULL) );
+	
+	/* hard coded values...no diea what these are ... maybe in time */
+	
+	file->unknown1 = 0x2;
+	file->unknown2 = 0x1;
+	file->unknown3 = 0x3;
+	file->unknown4 = 0x0;
+	file->unknown5 = 0x1;
+	file->unknown6 = 0x1;
+	
+	/* write header to the buffer */
+	
+	if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
+		result = False;
+		goto out;
+	}
+	
+	/* calculate the checksum, re-marshall data (to include the checksum) 
+	   and write to disk */
+	
+	file->checksum = regf_block_checksum( &ps );
+	prs_set_offset( &ps, 0 );
+	if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
+		result = False;
+		goto out;
+	}
+		
+	if ( write_block( file, &ps, 0 ) == -1 ) {
+		DEBUG(0,("init_regf_block: Failed to initialize registry header block!\n"));
+		result = False;
+		goto out;
+	}
+	
+out:
+	prs_mem_free( &ps );
+
+	return result;
+}
+/*******************************************************************
+ Open the registry file and then read in the REGF block to get the 
+ first hbin offset.
+*******************************************************************/
+
+ REGF_FILE* regfio_open( const char *filename, int flags, int mode )
+{
+	REGF_FILE *rb;
+	
+	if ( !(rb = SMB_MALLOC_P(REGF_FILE)) ) {
+		DEBUG(0,("ERROR allocating memory\n"));
+		return NULL;
+	}
+	ZERO_STRUCTP( rb );
+	rb->fd = -1;
+	rb->ignore_checksums = false;
+	
+	if ( !(rb->mem_ctx = talloc_init( "regfio_open" )) ) {
+		regfio_close( rb );
+		return NULL;
+	}
+
+	rb->open_flags = flags;
+	
+	/* open and existing file */
+
+	if ( (rb->fd = open(filename, flags, mode)) == -1 ) {
+		DEBUG(0,("regfio_open: failure to open %s (%s)\n", filename, strerror(errno)));
+		regfio_close( rb );
+		return NULL;
+	}
+	
+	/* check if we are creating a new file or overwriting an existing one */
+		
+	if ( flags & (O_CREAT|O_TRUNC) ) {
+		if ( !init_regf_block( rb ) ) {
+			DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
+			regfio_close( rb );
+			return NULL;
+		}
+		
+		/* success */
+		return rb;
+	}
+	
+	/* read in an existing file */
+	
+	if ( !read_regf_block( rb ) ) {
+		DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
+		regfio_close( rb );
+		return NULL;
+	}
+	
+	/* success */
+	
+	return rb;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static void regfio_mem_free( REGF_FILE *file )
+{
+	/* free any talloc()'d memory */
+	
+	if ( file && file->mem_ctx )
+		talloc_destroy( file->mem_ctx );	
+}
+
+/*******************************************************************
+*******************************************************************/
+
+ int regfio_close( REGF_FILE *file )
+{
+	int fd;
+
+	/* cleanup for a file opened for write */
+
+	if ((file->fd != -1) && (file->open_flags & (O_WRONLY|O_RDWR))) {
+		prs_struct ps;
+		REGF_SK_REC *sk;
+
+		/* write of sd list */
+
+		for ( sk=file->sec_desc_list; sk; sk=sk->next ) {
+			hbin_prs_sk_rec( "sk_rec", sk->hbin, 0, sk );
+		}
+
+		/* flush any dirty blocks */
+
+		while ( file->block_list ) {
+			hbin_block_close( file, file->block_list );
+		} 
+
+		ZERO_STRUCT( ps );
+
+		unix_to_nt_time( &file->mtime, time(NULL) );
+
+		if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) != -1 ) {
+			/* now use for writing */
+			prs_switch_type( &ps, MARSHALL );
+
+			/* stream the block once, generate the checksum, 
+			   and stream it again */
+			prs_set_offset( &ps, 0 );
+			prs_regf_block( "regf_blocK", &ps, 0, file );
+			file->checksum = regf_block_checksum( &ps );
+			prs_set_offset( &ps, 0 );
+			prs_regf_block( "regf_blocK", &ps, 0, file );
+
+			/* now we are ready to write it to disk */
+			if ( write_block( file, &ps, 0 ) == -1 )
+				DEBUG(0,("regfio_close: failed to update the regf header block!\n"));
+		}
+
+		prs_mem_free( &ps );
+	}
+	
+	regfio_mem_free( file );
+
+	/* nothing tdo do if there is no open file */
+
+	if (file->fd == -1)
+		return 0;
+		
+	fd = file->fd;
+	file->fd = -1;
+	SAFE_FREE( file );
+
+	return close( fd );
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static void regfio_flush( REGF_FILE *file )
+{
+	REGF_HBIN *hbin;
+
+	for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
+		write_hbin_block( file, hbin );
+	}
+}
+
+/*******************************************************************
+ There should be only *one* root key in the registry file based 
+ on my experience.  --jerry
+*******************************************************************/
+
+REGF_NK_REC* regfio_rootkey( REGF_FILE *file )
+{
+	REGF_NK_REC *nk;
+	REGF_HBIN   *hbin;
+	uint32_t      offset = REGF_BLOCKSIZE;
+	bool        found = False;
+	bool        eob;
+	
+	if ( !file )
+		return NULL;
+		
+	if ( !(nk = talloc_zero( file->mem_ctx, REGF_NK_REC )) ) {
+		DEBUG(0,("regfio_rootkey: talloc() failed!\n"));
+		return NULL;
+	}
+	
+	/* scan through the file on HBIN block at a time looking 
+	   for an NK record with a type == 0x002c.
+	   Normally this is the first nk record in the first hbin 
+	   block (but I'm not assuming that for now) */
+	
+	while ( (hbin = read_hbin_block( file, offset )) ) {
+		eob = False;
+
+		while ( !eob) {
+			if ( next_nk_record( file, hbin, nk, &eob ) ) {
+				if ( nk->key_type == NK_TYPE_ROOTKEY ) {
+					found = True;
+					break;
+				}
+			}
+			prs_mem_free( &hbin->ps );
+		}
+		
+		if ( found ) 
+			break;
+
+		offset += hbin->block_size;
+	}
+	
+	if ( !found ) {
+		DEBUG(0,("regfio_rootkey: corrupt registry file ?  No root key record located\n"));
+		return NULL;
+	}
+
+	DLIST_ADD( file->block_list, hbin );
+
+	return nk;		
+}
+
+/*******************************************************************
+ This acts as an interator over the subkeys defined for a given 
+ NK record.  Remember that offsets are from the *first* HBIN block.
+*******************************************************************/
+
+ REGF_NK_REC* regfio_fetch_subkey( REGF_FILE *file, REGF_NK_REC *nk )
+{
+	REGF_NK_REC *subkey;
+	REGF_HBIN   *hbin;
+	uint32_t      nk_offset;
+
+	/* see if there is anything left to report */
+	
+	if (nk == NULL ||
+	    nk->subkeys.hashes == NULL ||
+	    nk->subkey_index >= nk->subkeys.num_keys ||
+	    (nk->subkeys_off == REGF_OFFSET_NONE) ||
+	    (nk->subkey_index >= nk->num_subkeys)) {
+		return NULL;
+	}
+
+	/* find the HBIN block which should contain the nk record */
+
+	hbin = lookup_hbin_block(file,
+				 nk->subkeys.hashes[nk->subkey_index].nk_off);
+	if (hbin == NULL) {
+		DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing offset [0x%x]\n", 
+			nk->subkeys.hashes[nk->subkey_index].nk_off));
+		return NULL;
+	}
+	
+	nk_offset = nk->subkeys.hashes[nk->subkey_index].nk_off;
+	if ( !prs_set_offset( &hbin->ps, (HBIN_HDR_SIZE + nk_offset - hbin->first_hbin_off) ) )
+		return NULL;
+		
+	nk->subkey_index++;
+	if ( !(subkey = talloc_zero( file->mem_ctx, REGF_NK_REC )) )
+		return NULL;
+		
+	if ( !hbin_prs_key( file, hbin, subkey ) )
+		return NULL;
+	
+	return subkey;
+}
+
+
+/*******************************************************************
+*******************************************************************/
+
+static REGF_HBIN* regf_hbin_allocate( REGF_FILE *file, uint32_t block_size )
+{
+	REGF_HBIN *hbin;
+	SMB_STRUCT_STAT sbuf;
+
+	if ( !(hbin = talloc_zero( file->mem_ctx, REGF_HBIN )) )
+		return NULL;
+
+	memcpy( hbin->header, "hbin", HBIN_HDR_SIZE);
+
+
+	if (sys_fstat(file->fd, &sbuf, false)) {
+		DEBUG(0,("regf_hbin_allocate: stat() failed! (%s)\n", strerror(errno)));
+		return NULL;
+	}
+
+	hbin->file_off       = sbuf.st_ex_size;
+
+	hbin->free_off       = HBIN_HEADER_REC_SIZE;
+	hbin->free_size      = block_size - hbin->free_off + sizeof(uint32_t);
+
+	hbin->block_size     = block_size;
+	hbin->first_hbin_off = hbin->file_off - REGF_BLOCKSIZE;
+
+	if ( !prs_init( &hbin->ps, block_size, file->mem_ctx, MARSHALL ) )
+		return NULL;
+
+	if ( !prs_hbin_block( "new_hbin", &hbin->ps, 0, hbin ) )
+		return NULL;
+
+	if ( !write_hbin_block( file, hbin ) )
+		return NULL;
+
+	file->last_block = hbin->file_off;
+
+	return hbin;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static void update_free_space( REGF_HBIN *hbin, uint32_t size_used )
+{
+	hbin->free_off  += size_used;
+	hbin->free_size -= size_used;
+
+	if ( hbin->free_off >= hbin->block_size ) {
+		hbin->free_off = REGF_OFFSET_NONE;
+	}
+
+	return;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static REGF_HBIN* find_free_space( REGF_FILE *file, uint32_t size )
+{
+	REGF_HBIN *hbin, *p_hbin;
+	uint32_t block_off;
+	bool cached;
+
+	/* check open block list */
+
+	for ( hbin=file->block_list; hbin!=NULL; hbin=hbin->next ) {
+		/* only check blocks that actually have available space */
+
+		if ( hbin->free_off == REGF_OFFSET_NONE )
+			continue;
+
+		/* check for a large enough available chunk */
+
+		if ( (hbin->block_size - hbin->free_off) >= size ) {
+			DLIST_PROMOTE( file->block_list, hbin );
+			goto done;			
+		}
+	}
+
+	/* parse the file until we find a block with 
+	   enough free space; save the last non-filled hbin */
+
+	block_off = REGF_BLOCKSIZE;
+	do {
+		/* cleanup before the next round */
+		cached = False;
+		if ( hbin )
+			prs_mem_free( &hbin->ps );
+
+		hbin = read_hbin_block( file, block_off );
+
+		if ( hbin ) {
+
+			/* make sure that we don't already have this block in memory */
+
+			for ( p_hbin=file->block_list; p_hbin!=NULL; p_hbin=p_hbin->next ) {
+				if ( p_hbin->file_off == hbin->file_off ) {
+					cached = True;	
+					break;
+				}
+			}
+
+			block_off = hbin->file_off + hbin->block_size;
+
+			if ( cached ) {
+				prs_mem_free( &hbin->ps );
+				hbin = NULL;
+				continue;
+			}
+		}
+	/* if (cached block or (new block and not enough free space)) then continue looping */
+	} while ( cached || (hbin && (hbin->free_size < size)) );
+	
+	/* no free space; allocate a new one */
+
+	if ( !hbin ) {
+		uint32_t alloc_size;
+
+		/* allocate in multiples of REGF_ALLOC_BLOCK; make sure (size + hbin_header) fits */
+
+		alloc_size = (((size+HBIN_HEADER_REC_SIZE) / REGF_ALLOC_BLOCK ) + 1 ) * REGF_ALLOC_BLOCK;
+
+		if ( !(hbin = regf_hbin_allocate( file, alloc_size )) ) {
+			DEBUG(0,("find_free_space: regf_hbin_allocate() failed!\n"));
+			return NULL;
+		}
+		DLIST_ADD( file->block_list, hbin );
+	}
+
+done:
+	/* set the offset to be ready to write */
+
+	if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32_t) ) )
+		return NULL;
+
+	/* write the record size as a placeholder for now, it should be
+	   probably updated by the caller once it all of the data necessary 
+	   for the record */
+
+	if ( !prs_uint32("allocated_size", &hbin->ps, 0, &size) )
+		return NULL;
+
+	update_free_space( hbin, size );
+	
+	return hbin;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static uint32_t sk_record_data_size( struct security_descriptor * sd )
+{
+	uint32_t size, size_mod8;
+
+	size_mod8 = 0;
+
+	/* the record size is sizeof(hdr) + name + static members + data_size_field */
+
+	size = sizeof(uint32_t)*5 + ndr_size_security_descriptor(sd, 0) + sizeof(uint32_t);
+
+	/* multiple of 8 */
+	size_mod8 = size & 0xfffffff8;
+	if ( size_mod8 < size )
+		size_mod8 += 8;
+
+	return size_mod8;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static uint32_t vk_record_data_size( REGF_VK_REC *vk )
+{
+	uint32_t size, size_mod8;
+
+	size_mod8 = 0;
+
+	/* the record size is sizeof(hdr) + name + static members + data_size_field */
+
+	size = REC_HDR_SIZE + (sizeof(uint16_t)*3) + (sizeof(uint32_t)*3) + sizeof(uint32_t);
+
+	if ( vk->valuename )
+		size += strlen(vk->valuename);
+
+	/* multiple of 8 */
+	size_mod8 = size & 0xfffffff8;
+	if ( size_mod8 < size )
+		size_mod8 += 8;
+
+	return size_mod8;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static uint32_t lf_record_data_size( uint32_t num_keys )
+{
+	uint32_t size, size_mod8;
+
+	size_mod8 = 0;
+
+	/* the record size is sizeof(hdr) + num_keys + sizeof of hash_array + data_size_uint32_t */
+
+	size = REC_HDR_SIZE + sizeof(uint16_t) + (sizeof(REGF_HASH_REC) * num_keys) + sizeof(uint32_t);
+
+	/* multiple of 8 */
+	size_mod8 = size & 0xfffffff8;
+	if ( size_mod8 < size )
+		size_mod8 += 8;
+
+	return size_mod8;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static uint32_t nk_record_data_size( REGF_NK_REC *nk )
+{
+	uint32_t size, size_mod8;
+
+	size_mod8 = 0;
+
+	/* the record size is static + length_of_keyname + length_of_classname + data_size_uint32_t */
+
+	size = 0x4c + strlen(nk->keyname) + sizeof(uint32_t);
+
+	if ( nk->classname )
+		size += strlen( nk->classname );
+
+	/* multiple of 8 */
+	size_mod8 = size & 0xfffffff8;
+	if ( size_mod8 < size )
+		size_mod8 += 8;
+
+	return size_mod8;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool create_vk_record(REGF_FILE *file, REGF_VK_REC *vk,
+			     struct regval_blob *value)
+{
+	char *name = regval_name(value);
+	REGF_HBIN *data_hbin;
+
+	ZERO_STRUCTP( vk );
+
+	memcpy( vk->header, "vk", REC_HDR_SIZE );
+
+	if ( name ) {
+		vk->valuename = talloc_strdup( file->mem_ctx, regval_name(value) );
+		vk->flag = VK_FLAG_NAME_PRESENT;
+	}
+
+	vk->data_size = regval_size( value );
+	vk->type      = regval_type( value );
+
+	if ( vk->data_size > sizeof(uint32_t) ) {
+		uint32_t data_size = ( (vk->data_size+sizeof(uint32_t)) & 0xfffffff8 ) + 8;
+
+		vk->data = (uint8_t *)talloc_memdup( file->mem_ctx,
+						   regval_data_p(value),
+						   vk->data_size );
+		if (vk->data == NULL) {
+			return False;
+		}
+
+		/* go ahead and store the offset....we'll pick this hbin block back up when 
+		   we stream the data */
+
+		if ((data_hbin = find_free_space(file, data_size )) == NULL) {
+			return False;
+		}
+		vk->data_off = prs_offset( &data_hbin->ps ) + data_hbin->first_hbin_off - HBIN_HDR_SIZE;
+	}
+	else {
+		/* make sure we don't try to copy from a NULL value pointer */
+
+		if ( vk->data_size != 0 ) 
+			memcpy( &vk->data_off, regval_data_p(value), vk->data_size);
+		vk->data_size |= VK_DATA_IN_OFFSET;		
+	}
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static int hashrec_cmp( REGF_HASH_REC *h1, REGF_HASH_REC *h2 )
+{
+	return strcasecmp_m( h1->fullname, h2->fullname );
+}
+
+/*******************************************************************
+*******************************************************************/
+
+ REGF_NK_REC* regfio_write_key( REGF_FILE *file, const char *name,
+                               struct regval_ctr *values, struct regsubkey_ctr *subkeys,
+                               struct security_descriptor *sec_desc, REGF_NK_REC *parent )
+{
+	REGF_NK_REC *nk;
+	REGF_HBIN *vlist_hbin = NULL;
+	uint32_t size;
+
+	if ( !(nk = talloc_zero( file->mem_ctx, REGF_NK_REC )) )
+		return NULL;
+
+	memcpy( nk->header, "nk", REC_HDR_SIZE );
+
+	if ( !parent )
+		nk->key_type = NK_TYPE_ROOTKEY;
+	else
+		nk->key_type = NK_TYPE_NORMALKEY;
+
+	/* store the parent offset (or -1 if a the root key */
+
+	nk->parent_off = parent ? (parent->hbin_off + parent->hbin->file_off - REGF_BLOCKSIZE - HBIN_HDR_SIZE ) : REGF_OFFSET_NONE;
+
+	/* no classname currently */
+
+	nk->classname_off = REGF_OFFSET_NONE;
+	nk->classname = NULL;
+	nk->keyname = talloc_strdup( file->mem_ctx, name );
+
+	/* current modification time */
+
+	unix_to_nt_time( &nk->mtime, time(NULL) );
+
+	/* allocate the record on disk */
+
+	size = nk_record_data_size( nk );
+	nk->rec_size = ( size - 1 ) ^ 0XFFFFFFFF;
+	if ((nk->hbin = find_free_space( file, size )) == NULL) {
+		return NULL;
+	}
+	nk->hbin_off = prs_offset( &nk->hbin->ps );
+
+	/* Update the hash record in the parent */
+	
+	if ( parent ) {
+		REGF_HASH_REC *hash = &parent->subkeys.hashes[parent->subkey_index];
+
+		hash->nk_off = prs_offset( &nk->hbin->ps ) + nk->hbin->first_hbin_off - HBIN_HDR_SIZE;
+		memcpy(hash->keycheck, name, MIN(strlen(name),sizeof(uint32_t)));
+		hash->fullname = talloc_strdup( file->mem_ctx, name );
+		parent->subkey_index++;
+
+		/* sort the list by keyname */
+		TYPESAFE_QSORT(parent->subkeys.hashes, parent->subkey_index, hashrec_cmp);
+
+		if ( !hbin_prs_lf_records( "lf_rec", parent->subkeys.hbin, 0, parent ) )
+			return NULL;
+	}
+
+	/* write the security descriptor */
+
+	nk->sk_off = REGF_OFFSET_NONE;
+	if ( sec_desc ) {
+		uint32_t sk_size = sk_record_data_size( sec_desc );
+		REGF_HBIN *sk_hbin;
+
+		/* search for it in the existing list of sd's */
+
+		if ( (nk->sec_desc = find_sk_record_by_sec_desc( file, sec_desc )) == NULL ) {
+			/* not found so add it to the list */
+
+			if (!(sk_hbin = find_free_space( file, sk_size ))) {
+				return NULL;
+			}
+
+			if ( !(nk->sec_desc = talloc_zero( file->mem_ctx, REGF_SK_REC )) )
+				return NULL;
+	
+			/* now we have to store the security descriptor in the list and 
+			   update the offsets */
+
+			memcpy( nk->sec_desc->header, "sk", REC_HDR_SIZE );
+			nk->sec_desc->hbin      = sk_hbin;
+			nk->sec_desc->hbin_off  = prs_offset( &sk_hbin->ps );
+			nk->sec_desc->sk_off    = prs_offset( &sk_hbin->ps ) + sk_hbin->first_hbin_off - HBIN_HDR_SIZE;
+			nk->sec_desc->rec_size  = (sk_size-1)  ^ 0xFFFFFFFF;
+
+			nk->sec_desc->sec_desc  = sec_desc;
+			nk->sec_desc->ref_count = 0;
+			
+			/* size value must be self-inclusive */
+			nk->sec_desc->size      = ndr_size_security_descriptor(sec_desc, 0)
+				+ sizeof(uint32_t);
+
+			DLIST_ADD_END( file->sec_desc_list, nk->sec_desc);
+
+			/* update the offsets for us and the previous sd in the list.
+			   if this is the first record, then just set the next and prev
+			   offsets to ourself. */
+
+			if ( DLIST_PREV(nk->sec_desc) ) {
+				REGF_SK_REC *prev = DLIST_PREV(nk->sec_desc);
+
+				nk->sec_desc->prev_sk_off = prev->hbin_off + prev->hbin->first_hbin_off - HBIN_HDR_SIZE;
+				prev->next_sk_off = nk->sec_desc->sk_off;
+
+				/* the end must loop around to the front */
+				nk->sec_desc->next_sk_off = file->sec_desc_list->sk_off;
+
+				/* and first must loop around to the tail */
+				file->sec_desc_list->prev_sk_off = nk->sec_desc->sk_off;
+			} else {
+				nk->sec_desc->prev_sk_off = nk->sec_desc->sk_off;
+				nk->sec_desc->next_sk_off = nk->sec_desc->sk_off;
+			}
+		}
+
+		/* bump the reference count +1 */
+
+		nk->sk_off = nk->sec_desc->sk_off;
+		nk->sec_desc->ref_count++;
+	}
+
+	/* write the subkeys */
+
+	nk->subkeys_off = REGF_OFFSET_NONE;
+	if ( (nk->num_subkeys = regsubkey_ctr_numkeys( subkeys )) != 0 ) {
+		uint32_t lf_size = lf_record_data_size( nk->num_subkeys );
+		uint32_t namelen;
+		int i;
+		
+		if (!(nk->subkeys.hbin = find_free_space( file, lf_size ))) {
+			return NULL;
+		}
+		nk->subkeys.hbin_off = prs_offset( &nk->subkeys.hbin->ps );
+		nk->subkeys.rec_size = (lf_size-1) ^ 0xFFFFFFFF;
+		nk->subkeys_off = prs_offset( &nk->subkeys.hbin->ps ) + nk->subkeys.hbin->first_hbin_off - HBIN_HDR_SIZE;
+
+		memcpy( nk->subkeys.header, "lf", REC_HDR_SIZE );
+		
+		nk->subkeys.num_keys = nk->num_subkeys;
+		if (nk->subkeys.num_keys) {
+			if ( !(nk->subkeys.hashes = talloc_zero_array( file->mem_ctx, REGF_HASH_REC, nk->subkeys.num_keys )) )
+				return NULL;
+		} else {
+			nk->subkeys.hashes = NULL;
+		}
+		nk->subkey_index = 0;
+
+		/* update the max_bytes_subkey{name,classname} fields */
+		for ( i=0; i<nk->num_subkeys; i++ ) {
+			namelen = strlen( regsubkey_ctr_specific_key(subkeys, i) );
+			if ( namelen*2 > nk->max_bytes_subkeyname )
+				nk->max_bytes_subkeyname = namelen * 2;
+		}
+	}
+
+	/* write the values */
+
+	nk->values_off = REGF_OFFSET_NONE;
+	if ( (nk->num_values = regval_ctr_numvals( values )) != 0 ) {
+		uint32_t vlist_size = ( ( nk->num_values * sizeof(uint32_t) ) & 0xfffffff8 ) + 8;
+		int i;
+		
+		if (!(vlist_hbin = find_free_space( file, vlist_size ))) {
+			return NULL;
+		}
+		nk->values_off = prs_offset( &vlist_hbin->ps ) + vlist_hbin->first_hbin_off - HBIN_HDR_SIZE;
+	
+		if (nk->num_values) {
+			if ( !(nk->values = talloc_array( file->mem_ctx, REGF_VK_REC, nk->num_values )) )
+				return NULL;
+		} else {
+			nk->values = NULL;
+		}
+
+		/* create the vk records */
+
+		for ( i=0; i<nk->num_values; i++ ) {
+			uint32_t vk_size, namelen, datalen;
+			struct regval_blob *r;
+
+			r = regval_ctr_specific_value( values, i );
+			create_vk_record( file, &nk->values[i], r );
+			vk_size = vk_record_data_size( &nk->values[i] );
+			nk->values[i].hbin = find_free_space( file, vk_size );
+			nk->values[i].hbin_off = prs_offset( &nk->values[i].hbin->ps );
+			nk->values[i].rec_size = ( vk_size - 1 ) ^ 0xFFFFFFFF;
+			nk->values[i].rec_off = prs_offset( &nk->values[i].hbin->ps ) 
+				+ nk->values[i].hbin->first_hbin_off 
+				- HBIN_HDR_SIZE;
+
+			/* update the max bytes fields if necessary */
+
+			namelen = strlen( regval_name(r) );
+			if ( namelen*2 > nk->max_bytes_valuename )
+				nk->max_bytes_valuename = namelen * 2;
+
+			datalen = regval_size( r );
+			if ( datalen > nk->max_bytes_value )
+				nk->max_bytes_value = datalen;
+		}
+	}
+
+	/* stream the records */	
+	
+	prs_set_offset( &nk->hbin->ps, nk->hbin_off );
+	if ( !prs_nk_rec( "nk_rec", &nk->hbin->ps, 0, nk ) )
+		return NULL;
+
+	if ( nk->num_values ) {
+		if ( !hbin_prs_vk_records( "vk_records", vlist_hbin, 0, nk, file ) )
+			return NULL;
+	}
+
+
+	regfio_flush( file );
+
+	return nk;
+}
+