/*
* Extract VBA source code for component MS Office Documents
*
* Copyright (C) 2004-2005 trog@uncon.org
*
* This code is based on the OpenOffice and libgsf sources.
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <ctype.h>
#include <zlib.h>
#include "clamav.h"
#include "vba_extract.h"
#include "others.h"
#include "blob.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifndef HAVE_ATTRIB_PACKED
#define __attribute__(x)
#endif
#define PPT_LZW_BUFFSIZE 8192
#define NUM_VBA_VERSIONS 14
#define VBA_COMPRESSION_WINDOW 4096
#ifdef HAVE_PRAGMA_PACK
#pragma pack(1)
#endif
#ifdef HAVE_PRAGMA_PACK_HPPA
#pragma pack 1
#endif
struct vba56_header {
unsigned char magic[2];
unsigned char version[4];
uint16_t ooff __attribute__ ((packed)); /* 0x00FF */
uint32_t LidA __attribute__ ((packed)); /* Language identifiers */
uint32_t LidB __attribute__ ((packed));
uint16_t CharSet __attribute__ ((packed));
uint16_t LenA __attribute__ ((packed));
uint32_t UnknownB __attribute__ ((packed));
uint32_t UnknownC __attribute__ ((packed));
uint16_t LenB __attribute__ ((packed));
uint16_t LenC __attribute__ ((packed));
uint16_t LenD __attribute__ ((packed));
};
#ifdef HAVE_PRAGMA_PACK
#pragma pack()
#endif
#ifdef HAVE_PRAGMA_PACK_HPPA
#pragma pack
#endif
typedef struct vba_version_tag {
unsigned char signature[4];
const char *name;
int is_mac;
} vba_version_t;
static uint16_t vba_endian_convert_16(uint16_t value, int is_mac)
{
if (is_mac)
return (uint16_t)be16_to_host(value);
else
return le16_to_host(value);
}
static uint32_t vba_endian_convert_32(uint32_t value, int is_mac)
{
if (is_mac)
return be32_to_host(value);
else
return le32_to_host(value);
}
static const vba_version_t vba_version[NUM_VBA_VERSIONS] = {
{ { 0x5e, 0x00, 0x00, 0x01 }, "Office 97", FALSE},
{ { 0x5f, 0x00, 0x00, 0x01 }, "Office 97 SR1", FALSE },
{ { 0x65, 0x00, 0x00, 0x01 }, "Office 2000 alpha?", FALSE },
{ { 0x6b, 0x00, 0x00, 0x01 }, "Office 2000 beta?", FALSE },
{ { 0x6d, 0x00, 0x00, 0x01 }, "Office 2000", FALSE },
{ { 0x6f, 0x00, 0x00, 0x01 }, "Office 2000", FALSE },
{ { 0x70, 0x00, 0x00, 0x01 }, "Office XP beta 1/2", FALSE },
{ { 0x73, 0x00, 0x00, 0x01 }, "Office XP", FALSE },
{ { 0x76, 0x00, 0x00, 0x01 }, "Office 2003", FALSE },
{ { 0x79, 0x00, 0x00, 0x01 }, "Office 2003", FALSE },
{ { 0x60, 0x00, 0x00, 0x0e }, "MacOffice 98", TRUE },
{ { 0x62, 0x00, 0x00, 0x0e }, "MacOffice 2001", TRUE },
{ { 0x63, 0x00, 0x00, 0x0e }, "MacOffice X", TRUE },
{ { 0x64, 0x00, 0x00, 0x0e }, "MacOffice 2004", TRUE },
};
static char *
get_unicode_name(const char *name, int size, int is_mac)
{
int i, increment;
char *newname, *ret;
if((name == NULL) || (*name == '\0') || (size <= 0))
return NULL;
newname = (char *)cli_malloc(size * 7);
if(newname == NULL)
return NULL;
if((!is_mac) && (size & 0x1)) {
cli_dbgmsg("get_unicode_name: odd number of bytes %d\n", size);
--size;
}
increment = (is_mac) ? 1 : 2;
ret = newname;
for(i = 0; i < size; i += increment) {
if(isprint(name[i]))
*ret++ = name[i];
else {
if(name[i] < 10 && name[i] >= 0) {
*ret++ = '_';
*ret++ = (char)(name[i] + '0');
} else {
const uint16_t x = (uint16_t)(((name[i]) << 8) | name[i + 1]);
*ret++ = '_';
*ret++ = (char)('a'+((x&0xF)));
*ret++ = (char)('a'+((x>>4)&0xF));
*ret++ = (char)('a'+((x>>8)&0xF));
#if 0
*ret++ = (char)('a'+((x>>16)&0xF)); /* FIXME: x>>16 MUST == 0 */
*ret++ = (char)('a'+((x>>24)&0xF)); /* FIXME: x>>24 MUST == 0 */
#endif
}
*ret++ = '_';
}
}
*ret = '\0';
return newname;
}
static void vba56_test_middle(int fd)
{
char test_middle[20];
/* MacOffice middle */
static const uint8_t middle1_str[20] = {
0x00, 0x01, 0x0d, 0x45, 0x2e, 0xe1, 0xe0, 0x8f, 0x10, 0x1a,
0x85, 0x2e, 0x02, 0x60, 0x8c, 0x4d, 0x0b, 0xb4, 0x00, 0x00
};
/* MS Office middle */
static const uint8_t middle2_str[20] = {
0x00, 0x00, 0xe1, 0x2e, 0x45, 0x0d, 0x8f, 0xe0, 0x1a, 0x10,
0x85, 0x2e, 0x02, 0x60, 0x8c, 0x4d, 0x0b, 0xb4, 0x00, 0x00
};
if(cli_readn(fd, &test_middle, 20) != 20) {
return;
}
if ((memcmp(test_middle, middle1_str, 20) != 0) &&
(memcmp(test_middle, middle2_str, 20) != 0)) {
cli_dbgmsg("middle not found\n");
lseek(fd, -20, SEEK_CUR);
} else {
cli_dbgmsg("middle found\n");
}
return;
}
static int
vba_read_project_strings(int fd, int is_mac)
{
for (;;) {
uint32_t offset;
uint16_t length;
unsigned char *buff;
char *name;
if (cli_readn(fd, &length, 2) != 2) {
return FALSE;
}
length = vba_endian_convert_16(length, is_mac);
if (length < 6) {
lseek(fd, -2, SEEK_CUR);
break;
}
buff = (unsigned char *) cli_malloc(length);
if (!buff) {
cli_errmsg("cli_malloc failed\n");
return FALSE;
}
offset = lseek(fd, 0, SEEK_CUR);
if (cli_readn(fd, buff, length) != (int)length) {
cli_dbgmsg("read name failed - rewinding\n");
lseek(fd, offset, SEEK_SET);
free(buff);
break;
}
name = get_unicode_name((const char *)buff, length, is_mac);
if (name)
cli_dbgmsg("length: %d, name: %s\n", length, name);
else
cli_dbgmsg("length: %d, name: [null]\n", length);
free(buff);
/* Ignore twelve bytes from entries of type 'G'.
Type 'C' entries come in pairs, the second also
having a 12 byte trailer */
/* TODO: Need to check if types H(same as G) and D(same as C) exist */
if((name == NULL) || (memcmp("*\\", name, 2) != 0) ||
(strchr("GCHD", name[2]) == NULL)) {
/* Unknown type - probably ran out of strings - rewind */
lseek(fd, -(length+2), SEEK_CUR);
if(name)
free(name);
break;
}
free(name);
if (cli_readn(fd, &length, 2) != 2)
return FALSE;
length = vba_endian_convert_16(length, is_mac);
if ((length != 0) && (length != 65535)) {
lseek(fd, -2, SEEK_CUR);
continue;
}
offset = lseek(fd, 10, SEEK_CUR);
cli_dbgmsg("offset: %u\n", offset);
vba56_test_middle(fd);
}
return TRUE;
}
vba_project_t *vba56_dir_read(const char *dir)
{
unsigned char *buff;
const unsigned char vba56_signature[] = { 0xcc, 0x61 };
uint16_t record_count, length;
uint16_t ffff;
uint16_t byte_count;
uint32_t offset;
int i, fd, is_mac;
vba_project_t *vba_project;
struct vba56_header v56h;
char fullname[NAME_MAX + 1];
cli_dbgmsg("in vba56_dir_read()\n");
snprintf(fullname, sizeof(fullname) - 1, "%s/_VBA_PROJECT", dir);
fd = open(fullname, O_RDONLY|O_BINARY);
if (fd == -1) {
cli_dbgmsg("Can't open %s\n", fullname);
/* vba56_old_dir_read(dir); */
return NULL;
}
if(cli_readn(fd, &v56h, sizeof(struct vba56_header)) != sizeof(struct vba56_header)) {
close(fd);
return NULL;
}
if (memcmp(v56h.magic, vba56_signature, sizeof(v56h.magic)) != 0) {
close(fd);
return NULL;
}
for(i = 0; i < NUM_VBA_VERSIONS; i++)
if(memcmp(v56h.version, vba_version[i].signature, sizeof(vba_version[i].signature)) == 0)
break;
if (i == NUM_VBA_VERSIONS) {
cli_warnmsg("Unknown VBA version signature %x %x %x %x\n",
v56h.version[0], v56h.version[1],
v56h.version[2], v56h.version[3]);
switch(v56h.version[3]) {
case 0x01:
cli_warnmsg("Guessing little-endian\n");
is_mac = FALSE;
break;
case 0x0E:
cli_warnmsg("Guessing big-endian\n");
is_mac = TRUE;
break;
default:
cli_warnmsg("Unable to guess VBA type\n");
close(fd);
return NULL;
}
} else {
cli_dbgmsg("VBA Project: %s\n", vba_version[i].name);
is_mac = vba_version[i].is_mac;
}
if (!vba_read_project_strings(fd, is_mac)) {
close(fd);
return NULL;
}
/* junk some more stuff */
do {
if (cli_readn(fd, &ffff, 2) != 2) {
close(fd);
return NULL;
}
} while(ffff != 0xFFFF);
/* check for alignment error */
lseek(fd, -3, SEEK_CUR);
if (cli_readn(fd, &ffff, 2) != 2) {
close(fd);
return NULL;
}
if (ffff != 0xFFFF) {
lseek(fd, 1, SEEK_CUR);
}
if (cli_readn(fd, &ffff, 2) != 2) {
close(fd);
return NULL;
}
/* no idea what this stuff is */
if (ffff != 0xFFFF) {
ffff = vba_endian_convert_16(ffff, is_mac);
lseek(fd, ffff, SEEK_CUR);
}
if (cli_readn(fd, &ffff, 2) != 2) {
close(fd);
return NULL;
}
if (ffff != 0xFFFF) {
ffff = vba_endian_convert_16(ffff, is_mac);
lseek(fd, ffff, SEEK_CUR);
}
lseek(fd, 100, SEEK_CUR);
if (cli_readn(fd, &record_count, 2) != 2) {
close(fd);
return NULL;
}
record_count = vba_endian_convert_16(record_count, is_mac);
cli_dbgmsg("\nVBA Record count: %d\n", record_count);
if (record_count == 0) {
close(fd);
return NULL;
}
if (record_count > 1000) {
/* Almost certainly an error */
cli_dbgmsg("\nVBA Record count too big");
close(fd);
return NULL;
}
vba_project = (vba_project_t *) cli_malloc(sizeof(struct vba_project_tag));
if (!vba_project) {
close(fd);
return NULL;
}
vba_project->name = (char **) cli_malloc(sizeof(char *) * record_count);
if (!vba_project->name) {
free(vba_project);
close(fd);
return NULL;
}
vba_project->dir = cli_strdup(dir);
vba_project->offset = (uint32_t *) cli_malloc (sizeof(uint32_t) *
record_count);
if (!vba_project->offset) {
free(vba_project->dir);
free(vba_project->name);
free(vba_project);
close(fd);
return NULL;
}
vba_project->count = record_count;
for(i = 0; i < record_count; i++) {
if(cli_readn(fd, &length, 2) != 2)
break;
length = vba_endian_convert_16(length, is_mac);
if (length == 0) {
cli_dbgmsg("zero name length\n");
break;
}
buff = (unsigned char *) cli_malloc(length);
if (!buff) {
cli_dbgmsg("cli_malloc failed\n");
break;
}
if (cli_readn(fd, buff, length) != length) {
cli_dbgmsg("read name failed\n");
free(buff);
break;
}
vba_project->name[i] = get_unicode_name((const char *)buff, length, is_mac);
free(buff);
if (!vba_project->name[i]) {
offset = lseek(fd, 0, SEEK_CUR);
vba_project->name[i] = (char *) cli_malloc(18);
if(vba_project->name[i] == NULL) {
break;
}
snprintf(vba_project->name[i], 18, "clamav-%.10d", (int)offset);
}
cli_dbgmsg("project name: %s, ", vba_project->name[i]);
/* some kind of string identifier ?? */
if (cli_readn(fd, &length, 2) != 2) {
free(vba_project->name[i]);
break;
}
length = vba_endian_convert_16(length, is_mac);
lseek(fd, length, SEEK_CUR);
/* unknown stuff */
if (cli_readn(fd, &ffff, 2) != 2) {
free(vba_project->name[i]);
break;
}
ffff = vba_endian_convert_16(ffff, is_mac);
if (ffff == 0xFFFF) {
lseek(fd, 2, SEEK_CUR);
if (cli_readn(fd, &ffff, 2) != 2) {
free(vba_project->name[i]);
break;
}
ffff = vba_endian_convert_16(ffff, is_mac);
lseek(fd, ffff, SEEK_CUR);
} else {
lseek(fd, 2 + ffff, SEEK_CUR);
}
lseek(fd, 8, SEEK_CUR);
if (cli_readn(fd, &byte_count, 2) != 2) {
free(vba_project->name[i]);
break;
}
byte_count = vba_endian_convert_16(byte_count, is_mac);
lseek(fd, (8 * byte_count) + 5, SEEK_CUR);
if (cli_readn(fd, &offset, 4) != 4) {
free(vba_project->name[i]);
break;
}
offset = vba_endian_convert_32(offset, is_mac);
vba_project->offset[i] = offset;
cli_dbgmsg("offset:%u\n", offset);
lseek(fd, 2, SEEK_CUR);
}
close(fd);
if(i < record_count) {
/* above loop failed */
while(--i >= 0)
free(vba_project->name[i]);
free(vba_project->name);
free(vba_project->dir);
free(vba_project->offset);
free(vba_project);
return NULL;
}
return vba_project;
}
unsigned char *vba_decompress(int fd, uint32_t offset, int *size)
{
unsigned int i, pos=0, shift, win_pos, clean=TRUE, mask, distance;
uint8_t flag;
uint16_t token, len;
size_t s;
blob *b;
unsigned char *ret;
unsigned char buffer[VBA_COMPRESSION_WINDOW];
b = blobCreate();
if(b == NULL)
return NULL;
lseek(fd, offset+3, SEEK_SET); /* 1byte ?? , 2byte length ?? */
while (cli_readn(fd, &flag, 1) == 1) {
for (mask = 1; mask < 0x100; mask<<=1) {
if (flag & mask) {
if (cli_readn(fd, &token, 2) != 2) {
blobDestroy(b);
if (size) {
*size = 0;
}
return NULL;
}
token = vba_endian_convert_16(token, FALSE);
win_pos = pos % VBA_COMPRESSION_WINDOW;
if (win_pos <= 0x80) {
if (win_pos <= 0x20) {
shift = (win_pos <= 0x10) ? 12:11;
} else {
shift = (win_pos <= 0x40) ? 10:9;
}
} else {
if (win_pos <= 0x200) {
shift = (win_pos <= 0x100) ? 8:7;
} else if (win_pos <= 0x800) {
shift = (win_pos <= 0x400) ? 6:5;
} else {
shift = 4;
}
}
len = (uint16_t)((token & ((1 << shift) -1)) + 3);
distance = token >> shift;
clean = TRUE;
for (i=0 ; i < len; i++) {
unsigned int srcpos;
unsigned char c;
srcpos = (pos - distance - 1) % VBA_COMPRESSION_WINDOW;
c = buffer[srcpos];
buffer[pos++ % VBA_COMPRESSION_WINDOW]= c;
}
} else {
if ((pos != 0) &&
((pos % VBA_COMPRESSION_WINDOW) == 0) && clean) {
if (cli_readn(fd, &token, 2) != 2) {
blobDestroy(b);
if(size)
*size = 0;
return NULL;
}
clean = FALSE;
(void)blobAddData(b, buffer, VBA_COMPRESSION_WINDOW);
break;
}
if (cli_readn(fd, buffer+(pos%VBA_COMPRESSION_WINDOW), 1) == 1){
pos++;
}
clean = TRUE;
}
}
}
if (pos % VBA_COMPRESSION_WINDOW)
if(blobAddData(b, buffer, pos%VBA_COMPRESSION_WINDOW) < 0) {
if(size)
*size = 0;
blobDestroy(b);
return NULL;
}
s = blobGetDataSize(b);
ret = cli_malloc(s);
if(ret == NULL) {
blobDestroy(b);
if(size)
*size = 0;
return NULL;
}
if(size)
*size = (int)s;
memcpy(ret, blobGetData(b), s);
blobDestroy(b);
return ret;
}
static uint32_t ole_copy_file_data(int ifd, int ofd, uint32_t len)
{
unsigned int count, rem;
unsigned char data[FILEBUFF];
rem = len;
while (rem > 0) {
unsigned int todo = MIN(sizeof(data), rem);
count = cli_readn(ifd, data, todo);
if (count != todo) {
return len-rem;
}
if((unsigned int)cli_writen(ofd, data, count) != count)
return len-rem-count;
rem -= count;
}
return len;
}
int cli_decode_ole_object(int fd, const char *dir)
{
int ofd;
struct stat statbuf;
char ch;
uint32_t object_size;
char fullname[NAME_MAX + 1];
if (fstat(fd, &statbuf) == -1) {
return -1;
}
if (cli_readn(fd, &object_size, 4) != 4) {
return -1;
}
object_size = vba_endian_convert_32(object_size, FALSE);
if ((statbuf.st_size - object_size) >= 4) {
/* Probably the OLE type id */
if (lseek(fd, 2, SEEK_CUR) == -1) {
return -1;
}
/* Skip attachment name */
do {
if (cli_readn(fd, &ch, 1) != 1) {
return -1;
}
} while (ch);
/* Skip attachment full path */
do {
if (cli_readn(fd, &ch, 1) != 1) {
return -1;
}
} while (ch);
/* Skip unknown data */
if (lseek(fd, 8, SEEK_CUR) == -1) {
return -1;
}
/* Skip attachment full path */
do {
if (cli_readn(fd, &ch, 1) != 1) {
return -1;
}
} while (ch);
if (cli_readn(fd, &object_size, 4) != 4) {
return -1;
}
object_size = vba_endian_convert_32(object_size, FALSE);
}
snprintf(fullname, sizeof(fullname) - 1, "%s/_clam_ole_object", dir);
ofd = open(fullname, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, 0600);
if (ofd < 0) {
return -1;
}
ole_copy_file_data(fd, ofd, object_size);
lseek(ofd, 0, SEEK_SET);
return ofd;
}
/* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
/* Code to extract Power Point Embedded OLE2 Objects */
/* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
typedef struct atom_header_tag {
off_t foffset;
uint16_t ver_inst;
uint8_t version;
uint16_t instance;
uint16_t type;
uint32_t length;
} atom_header_t;
static int ppt_read_atom_header(int fd, atom_header_t *atom_header)
{
atom_header->foffset = lseek(fd, 0, SEEK_CUR);
if (cli_readn(fd, &atom_header->ver_inst, 2) != 2) {
cli_dbgmsg("read ppt_current_user failed\n");
return FALSE;
}
atom_header->ver_inst = vba_endian_convert_16(atom_header->ver_inst, FALSE);
atom_header->version = (uint8_t)(atom_header->ver_inst & 0x000f);
atom_header->instance = (uint16_t)(atom_header->ver_inst >> 4);
if(cli_readn(fd, &atom_header->type, sizeof(uint16_t)) != sizeof(uint16_t)) {
cli_dbgmsg("read ppt_current_user failed\n");
return FALSE;
}
if (cli_readn(fd, &atom_header->length, 4) != 4) {
cli_dbgmsg("read ppt_current_user failed\n");
return FALSE;
}
atom_header->type = vba_endian_convert_16(atom_header->type, FALSE);
atom_header->length = vba_endian_convert_32(atom_header->length, FALSE);
return TRUE;
}
static void ppt_print_atom_header(atom_header_t *atom_header)
{
cli_dbgmsg("Atom Hdr:\n");
cli_dbgmsg(" Version: 0x%.2x\n", atom_header->version);
cli_dbgmsg(" Instance: 0x%.4x\n", atom_header->instance);
cli_dbgmsg(" Type: 0x%.4x\n", atom_header->type);
cli_dbgmsg(" Length: 0x%.8x\n", atom_header->length);
}
static int ppt_unlzw(const char *dir, int fd, uint32_t length)
{
int ofd, retval;
unsigned char inbuff[PPT_LZW_BUFFSIZE], outbuff[PPT_LZW_BUFFSIZE];
uint32_t bufflen;
z_stream stream;
char fullname[NAME_MAX + 1];
snprintf(fullname, sizeof(fullname) - 1, "%s/ppt%.8lx.doc",
dir, (long)lseek(fd, 0L, SEEK_CUR));
ofd = open(fullname, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0600);
if (ofd == -1) {
cli_dbgmsg("ppt_unlzw Open outfile failed\n");
return FALSE;
}
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.opaque = (void *)0;
stream.next_in = inbuff;
bufflen = stream.avail_in = MIN(length, PPT_LZW_BUFFSIZE);
if (cli_readn(fd, inbuff, stream.avail_in) != (int64_t)stream.avail_in) {
close(ofd);
unlink(fullname);
return FALSE;
}
length -= stream.avail_in;
retval = inflateInit(&stream);
if (retval != Z_OK) {
cli_dbgmsg(" ppt_unlzw !Z_OK: %d\n", retval);
}
stream.next_out = outbuff;
stream.avail_out = PPT_LZW_BUFFSIZE;
do {
if (stream.avail_out == 0) {
if (cli_writen(ofd, outbuff, PPT_LZW_BUFFSIZE)
!= PPT_LZW_BUFFSIZE) {
close(ofd);
inflateEnd(&stream);
return FALSE;
}
stream.next_out = outbuff;
stream.avail_out = PPT_LZW_BUFFSIZE;
}
if (stream.avail_in == 0) {
stream.next_in = inbuff;
bufflen = stream.avail_in = MIN(length, PPT_LZW_BUFFSIZE);
if (cli_readn(fd, inbuff, stream.avail_in) != (int64_t)stream.avail_in) {
close(ofd);
inflateEnd(&stream);
return FALSE;
}
length -= stream.avail_in;
}
retval = inflate(&stream, Z_NO_FLUSH);
} while (retval == Z_OK);
if (cli_writen(ofd, outbuff, bufflen) != (int64_t)bufflen) {
close(ofd);
inflateEnd(&stream);
return FALSE;
}
inflateEnd(&stream);
return close(ofd);
}
static char *ppt_stream_iter(int fd)
{
uint32_t ole_id;
char *out_dir;
off_t offset;
atom_header_t atom_header;
/* Create a directory to store the extracted OLE2 objects */
out_dir = cli_gentemp(NULL);
if(mkdir(out_dir, 0700)) {
cli_errmsg("ScanOLE2 -> Can't create temporary directory %s\n", out_dir);
free(out_dir);
return NULL;
}
while(ppt_read_atom_header(fd, &atom_header)) {
ppt_print_atom_header(&atom_header);
if (atom_header.length == 0) {
cli_rmdirs(out_dir);
free(out_dir);
return NULL;
}
if (atom_header.type == 0x1011) {
if (cli_readn(fd, &ole_id, 4) != 4) {
cli_dbgmsg("read ole_id failed\n");
cli_rmdirs(out_dir);
free(out_dir);
return NULL;
}
ole_id = vba_endian_convert_32(ole_id, FALSE);
cli_dbgmsg("OleID: %d, length: %d\n",
(int)ole_id, (int)atom_header.length-4);
if (!ppt_unlzw(out_dir, fd, atom_header.length-4)) {
cli_dbgmsg("ppt_unlzw failed\n");
cli_rmdirs(out_dir);
free(out_dir);
return NULL;
}
} else {
offset = lseek(fd, 0, SEEK_CUR);
/* Check we don't wrap */
if ((offset + (off_t)atom_header.length) < offset) {
break;
}
offset += atom_header.length;
if (lseek(fd, offset, SEEK_SET) != offset ) {
break;
}
}
}
return out_dir;
}
char *ppt_vba_read(const char *dir)
{
char *out_dir;
int fd;
char fullname[NAME_MAX + 1];
snprintf(fullname, sizeof(fullname) - 1, "%s/PowerPoint Document", dir);
fd = open(fullname, O_RDONLY|O_BINARY);
if (fd == -1) {
cli_dbgmsg("Open PowerPoint Document failed\n");
return NULL;
}
out_dir = ppt_stream_iter(fd);
close(fd);
return out_dir;
}
/* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
/* Code to extract Word6 macros */
/* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
typedef struct mso_fib_tag {
char ununsed[sizeof(uint16_t) + sizeof(uint16_t) +
sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint16_t) +
sizeof(uint16_t)];
uint32_t macro_offset;
uint32_t macro_len;
} mso_fib_t;
typedef struct macro_entry_tag {
unsigned char version;
unsigned char key;
uint16_t intname_i;
uint16_t extname_i;
uint16_t xname_i;
uint32_t unknown;
uint32_t len;
uint32_t state;
uint32_t offset;
} macro_entry_t;
typedef struct macro_info_tag {
uint16_t count;
struct macro_entry_tag *macro_entry;
} macro_info_t;
static void wm_free_macro_info(macro_info_t *macro_info);
static void wm_print_fib(mso_fib_t *fib)
{
cli_dbgmsg("macro offset: 0x%.4x\n", fib->macro_offset);
cli_dbgmsg("macro len: 0x%.4x\n\n", fib->macro_len);
}
static int wm_read_fib(int fd, mso_fib_t *fib)
{
/* don't need the information is this block, so seek forward */
if (lseek(fd, 0x118, SEEK_SET) != 0x118) {
cli_dbgmsg("lseek wm_fib failed\n");
return FALSE;
}
if (cli_readn(fd, &fib->macro_offset, 4) != 4) {
cli_dbgmsg("read wm_fib failed\n");
return FALSE;
}
if (cli_readn(fd, &fib->macro_len, 4) != 4) {
cli_dbgmsg("read wm_fib failed\n");
return FALSE;
}
fib->macro_offset = vba_endian_convert_32(fib->macro_offset, FALSE);
fib->macro_len = vba_endian_convert_32(fib->macro_len, FALSE);
return TRUE;
}
static int wm_read_macro_entry(int fd, macro_entry_t *macro_entry)
{
if (cli_readn(fd, ¯o_entry->version, 1) != 1) {
cli_dbgmsg("read macro_entry failed\n");
return FALSE;
}
if (cli_readn(fd, ¯o_entry->key, 1) != 1) {
cli_dbgmsg("read macro_entry failed\n");
return FALSE;
}
if (cli_readn(fd, ¯o_entry->intname_i, 2) != 2) {
cli_dbgmsg("read macro_entry failed\n");
return FALSE;
}
if (cli_readn(fd, ¯o_entry->extname_i, 2) != 2) {
cli_dbgmsg("read macro_entry failed\n");
return FALSE;
}
if (cli_readn(fd, ¯o_entry->xname_i, 2) != 2) {
cli_dbgmsg("read macro_entry failed\n");
return FALSE;
}
if (cli_readn(fd, ¯o_entry->unknown, 4) != 4) {
cli_dbgmsg("read macro_entry failed\n");
return FALSE;
}
if (cli_readn(fd, ¯o_entry->len, 4) != 4) {
cli_dbgmsg("read macro_entry failed\n");
return FALSE;
}
if (cli_readn(fd, ¯o_entry->state, 4) != 4) {
cli_dbgmsg("read macro_entry failed\n");
return FALSE;
}
if (cli_readn(fd, ¯o_entry->offset, 4) != 4) {
cli_dbgmsg("read macro_entry failed\n");
return FALSE;
}
macro_entry->intname_i = vba_endian_convert_16(macro_entry->intname_i, FALSE);
macro_entry->extname_i = vba_endian_convert_16(macro_entry->extname_i, FALSE);
macro_entry->xname_i = vba_endian_convert_16(macro_entry->xname_i, FALSE);
macro_entry->len = vba_endian_convert_32(macro_entry->len, FALSE);
macro_entry->state = vba_endian_convert_32(macro_entry->state, FALSE);
macro_entry->offset = vba_endian_convert_32(macro_entry->offset, FALSE);
return TRUE;
}
static macro_info_t *wm_read_macro_info(int fd)
{
int i;
macro_info_t *macro_info;
macro_info = (macro_info_t *) cli_malloc(sizeof(macro_info_t));
if (!macro_info) {
return NULL;
}
if (cli_readn(fd, ¯o_info->count, 2) != 2) {
cli_dbgmsg("read macro_info failed\n");
free(macro_info);
return NULL;
}
macro_info->count = vba_endian_convert_16(macro_info->count, FALSE);
cli_dbgmsg("macro count: %d\n", macro_info->count);
macro_info->macro_entry = (macro_entry_t *)
cli_malloc(sizeof(macro_entry_t) * macro_info->count);
if (!macro_info->macro_entry) {
free(macro_info);
return NULL;
}
for (i=0 ; i < macro_info->count ; i++) {
if (!wm_read_macro_entry(fd,
¯o_info->macro_entry[i])) {
wm_free_macro_info(macro_info);
return NULL;
}
}
return macro_info;
}
static void
wm_free_macro_info(macro_info_t *macro_info)
{
if (macro_info) {
free(macro_info->macro_entry);
free(macro_info);
}
}
static int wm_read_oxo3(int fd)
{
uint8_t count;
if (cli_readn(fd, &count, 1) != 1) {
cli_dbgmsg("read oxo3 record1 failed\n");
return FALSE;
}
if (lseek(fd, count*14, SEEK_CUR) == -1) {
cli_dbgmsg("lseek oxo3 record1 failed\n");
return FALSE;
}
cli_dbgmsg("oxo3 records1: %d\n", count);
if (cli_readn(fd, &count, 1) != 1) {
cli_dbgmsg("read oxo3 record2 failed\n");
return FALSE;
}
if (count == 0) {
if (cli_readn(fd, &count, 1) != 1) {
cli_dbgmsg("read oxo3 failed\n");
return FALSE;
}
if (count != 2) {
lseek(fd, -1, SEEK_CUR);
return TRUE;
}
if (cli_readn(fd, &count, 1) != 1) {
cli_dbgmsg("read oxo3 failed\n");
return FALSE;
}
}
if (count > 0) {
if (lseek(fd, (count*4)+1, SEEK_CUR) == -1) {
cli_dbgmsg("lseek oxo3 failed\n");
return FALSE;
}
}
cli_dbgmsg("oxo3 records2: %d\n", count);
return TRUE;
}
static int
wm_skip_menu_info(int fd)
{
uint16_t count;
if (cli_readn(fd, &count, sizeof(uint16_t)) != sizeof(uint16_t)) {
cli_dbgmsg("read menu_info failed\n");
return FALSE;
}
count = vba_endian_convert_16(count, FALSE);
cli_dbgmsg("menu_info count: %d\n", count);
if(count)
if(lseek(fd, count * 12, SEEK_CUR) == -1)
return FALSE;
return TRUE;
}
static int
wm_skip_macro_extnames(int fd)
{
int is_unicode;
int16_t size;
off_t offset_end = lseek(fd, 0, SEEK_CUR);
if(cli_readn(fd, &size, sizeof(int16_t)) != sizeof(int16_t)) {
cli_dbgmsg("read macro_extnames failed\n");
return FALSE;
}
size = vba_endian_convert_16(size, FALSE);
if (size == -1) { /* Unicode flag */
if(cli_readn(fd, &size, sizeof(int16_t)) != sizeof(int16_t)) {
cli_dbgmsg("read macro_extnames failed\n");
return FALSE;
}
size = vba_endian_convert_16(size, FALSE);
is_unicode = 1;
} else
is_unicode = 0;
cli_dbgmsg("ext names size: 0x%x\n", size);
offset_end += size;
while(lseek(fd, 0, SEEK_CUR) < offset_end) {
uint8_t length;
off_t offset;
if (cli_readn(fd, &length, 1) != 1) {
cli_dbgmsg("read macro_extnames failed\n");
return FALSE;
}
if(is_unicode)
offset = (off_t)length * 2 + 1;
else
offset = (off_t)length;
offset += sizeof(uint16_t); /* numref */
if(lseek(fd, offset, SEEK_CUR) == -1) {
cli_dbgmsg("read macro_extnames failed to seek\n");
return FALSE;
}
}
return TRUE;
}
static int
wm_skip_macro_intnames(int fd)
{
uint16_t i, count;
if (cli_readn(fd, &count, sizeof(uint16_t)) != sizeof(uint16_t)) {
cli_dbgmsg("read macro_intnames failed\n");
return FALSE;
}
count = vba_endian_convert_16(count, FALSE);
cli_dbgmsg("int names count: %u\n", count);
for(i = 0; i < count; i++) {
uint8_t length;
/* id */
if(lseek(fd, sizeof(uint16_t), SEEK_CUR) == -1) {
cli_dbgmsg("skip_macro_intnames failed\n");
return FALSE;
}
if(cli_readn(fd, &length, sizeof(uint8_t)) != sizeof(uint8_t)) {
cli_dbgmsg("skip_macro_intnames failed\n");
return FALSE;
}
/* Internal name, plus one byte of unknown data */
if(lseek(fd, length + 1, SEEK_CUR) == -1) {
cli_dbgmsg("skip_macro_intnames failed\n");
return FALSE;
}
}
return TRUE;
}
vba_project_t *wm_dir_read(const char *dir)
{
int fd, done;
off_t end_offset;
unsigned char info_id;
macro_info_t *macro_info=NULL;
vba_project_t *vba_project;
mso_fib_t fib;
char fullname[NAME_MAX + 1];
snprintf(fullname, sizeof(fullname) - 1, "%s/WordDocument", dir);
fd = open(fullname, O_RDONLY|O_BINARY);
if (fd == -1) {
cli_dbgmsg("Open WordDocument failed\n");
return NULL;
}
if (!wm_read_fib(fd, &fib)) {
close(fd);
return NULL;
}
if(fib.macro_len == 0) {
cli_dbgmsg("No macros detected\n");
/* Must be clean */
close(fd);
return NULL;
}
wm_print_fib(&fib);
/* Go one past the start to ignore start_id */
if (lseek(fd, fib.macro_offset + 1, SEEK_SET) != (off_t)(fib.macro_offset + 1)) {
cli_dbgmsg("lseek macro_offset failed\n");
close(fd);
return NULL;
}
end_offset = fib.macro_offset + fib.macro_len;
done = FALSE;
while ((lseek(fd, 0, SEEK_CUR) < end_offset) && !done) {
if (cli_readn(fd, &info_id, 1) != 1) {
cli_dbgmsg("read macro_info failed\n");
close(fd);
return NULL;
}
switch (info_id) {
case 0x01:
if(macro_info)
wm_free_macro_info(macro_info);
macro_info = wm_read_macro_info(fd);
if(macro_info == NULL)
done = TRUE;
break;
case 0x03:
if(!wm_read_oxo3(fd))
done = TRUE;
break;
case 0x05:
if(!wm_skip_menu_info(fd))
done = TRUE;
break;
case 0x10:
if(!wm_skip_macro_extnames(fd))
done = TRUE;
break;
case 0x11:
if(!wm_skip_macro_intnames(fd))
done = TRUE;
break;
case 0x12:
/* No sure about these, always seems to
come after the macros though, so finish
*/
done = TRUE;
break;
case 0x40:
/* end marker */
done = TRUE;
break;
default:
cli_dbgmsg("unknown type: 0x%x\n", info_id);
done = TRUE;
}
}
close(fd);
if (macro_info) {
vba_project = (vba_project_t *) cli_malloc(sizeof(struct vba_project_tag));
if (!vba_project) {
goto abort;
}
vba_project->name = (char **) cli_malloc(sizeof(char *) *macro_info->count);
if (!vba_project->name) {
free(vba_project);
vba_project = NULL;
goto abort;
}
vba_project->dir = cli_strdup(dir);
vba_project->offset = (uint32_t *) cli_malloc(sizeof(uint32_t) *
macro_info->count);
if (!vba_project->offset) {
free(vba_project->name);
if(vba_project->dir)
free(vba_project->dir);
free(vba_project);
vba_project = NULL;
goto abort;
}
vba_project->length = (uint32_t *) cli_malloc(sizeof(uint32_t) *
macro_info->count);
if (!vba_project->length) {
free(vba_project->offset);
free(vba_project->name);
free(vba_project->dir);
free(vba_project);
vba_project = NULL;
goto abort;
}
vba_project->key = (unsigned char *) cli_malloc(sizeof(unsigned char) *
macro_info->count);
if (!vba_project->key) {
free(vba_project->length);
free(vba_project->offset);
free(vba_project->name);
free(vba_project->dir);
free(vba_project);
vba_project = NULL;
} else {
int i;
vba_project->count = macro_info->count;
for(i = 0; i < macro_info->count; i++) {
vba_project->name[i] = cli_strdup("WordDocument");
vba_project->offset[i] = macro_info->macro_entry[i].offset;
vba_project->length[i] = macro_info->macro_entry[i].len;
vba_project->key[i] = macro_info->macro_entry[i].key;
}
}
abort:
wm_free_macro_info(macro_info);
/* Fall through */
} else
vba_project = NULL;
return vba_project;
}
unsigned char *wm_decrypt_macro(int fd, uint32_t offset, uint32_t len,
unsigned char key)
{
unsigned char *buff;
uint32_t i;
if (lseek(fd, offset, SEEK_SET) != (int64_t)offset) {
return NULL;
}
buff = (unsigned char *) cli_malloc(len);
if (!buff) {
return NULL;
}
if (cli_readn(fd, buff, len) != (int)len) {
free(buff);
return NULL;
}
if (key != 0)
for (i=0 ; i < len; i++)
buff[i] ^= key;
return buff;
}