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denyhosts/clamav/libclamav/hwp.c

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/*
* HWP Stuff
*
* Copyright (C) 2015-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
*
* Authors: Kevin Lin
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*
* 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
#if HAVE_LIBXML2
#include <libxml/xmlreader.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include <zlib.h>
#if HAVE_ICONV
#include <iconv.h>
#endif
#include "clamav.h"
#include "fmap.h"
#include "str.h"
#include "conv.h"
#include "others.h"
#include "scanners.h"
#include "msxml_parser.h"
#include "msxml.h"
#include "json_api.h"
#include "hwp.h"
#if HAVE_JSON
#include "msdoc.h"
#endif
#define HWP5_DEBUG 0
#define HWP3_DEBUG 0
#define HWP3_VERIFY 0
#define HWPML_DEBUG 0
#if HWP5_DEBUG
#define hwp5_debug(...) cli_dbgmsg(__VA_ARGS__)
#else
#define hwp5_debug(...) {};
#endif
#if HWP3_DEBUG
#define hwp3_debug(...) cli_dbgmsg(__VA_ARGS__)
#else
#define hwp3_debug(...) {};
#endif
#if HWPML_DEBUG
#define hwpml_debug(...) cli_dbgmsg(__VA_ARGS__)
#else
#define hwpml_debug(...) {};
#endif
typedef cl_error_t (*hwp_cb)(void *cbdata, int fd, const char *filepath, cli_ctx *ctx);
static cl_error_t decompress_and_callback(cli_ctx *ctx, fmap_t *input, size_t at, size_t len, const char *parent, hwp_cb cb, void *cbdata)
{
cl_error_t ret = CL_SUCCESS;
int zret, ofd;
size_t in;
size_t off_in = at;
size_t count, remain = 1, outsize = 0;
z_stream zstrm;
char *tmpname;
unsigned char inbuf[FILEBUFF], outbuf[FILEBUFF];
if (!ctx || !input || !cb)
return CL_ENULLARG;
if (len)
remain = len;
/* reserve tempfile for output and callback */
if ((ret = cli_gentempfd(ctx->sub_tmpdir, &tmpname, &ofd)) != CL_SUCCESS) {
cli_errmsg("%s: Can't generate temporary file\n", parent);
return ret;
}
/* initialize zlib inflation stream */
memset(&zstrm, 0, sizeof(zstrm));
zstrm.zalloc = Z_NULL;
zstrm.zfree = Z_NULL;
zstrm.opaque = Z_NULL;
zstrm.next_in = inbuf;
zstrm.next_out = outbuf;
zstrm.avail_in = 0;
zstrm.avail_out = FILEBUFF;
zret = inflateInit2(&zstrm, -15);
if (zret != Z_OK) {
cli_errmsg("%s: Can't initialize zlib inflation stream\n", parent);
ret = CL_EUNPACK;
goto dc_end;
}
/* inflation loop */
do {
if (zstrm.avail_in == 0) {
zstrm.next_in = inbuf;
in = fmap_readn(input, inbuf, off_in, FILEBUFF);
if (in == (size_t)-1) {
cli_errmsg("%s: Error reading stream\n", parent);
ret = CL_EUNPACK;
goto dc_end;
}
if (!in)
break;
if (len) {
if (remain < in)
in = remain;
remain -= in;
}
zstrm.avail_in = in;
off_in += in;
}
zret = inflate(&zstrm, Z_SYNC_FLUSH);
count = FILEBUFF - zstrm.avail_out;
if (count) {
if ((ret = cli_checklimits("HWP", ctx, outsize + count, 0, 0)) != CL_SUCCESS)
break;
if (cli_writen(ofd, outbuf, count) != count) {
cli_errmsg("%s: Can't write to file %s\n", parent, tmpname);
ret = CL_EWRITE;
goto dc_end;
}
outsize += count;
}
zstrm.next_out = outbuf;
zstrm.avail_out = FILEBUFF;
} while (zret == Z_OK && remain);
cli_dbgmsg("%s: Decompressed %zu bytes to %s\n", parent, outsize, tmpname);
/* post inflation checks */
if (zret != Z_STREAM_END && zret != Z_OK) {
if (outsize == 0) {
cli_infomsg(ctx, "%s: Error decompressing stream. No data decompressed.\n", parent);
ret = CL_EUNPACK;
goto dc_end;
}
cli_infomsg(ctx, "%s: Error decompressing stream. Scanning what was decompressed.\n", parent);
}
/* check for limits exceeded or zlib failure */
if (ret == CL_SUCCESS && (zret == Z_STREAM_END || zret == Z_OK)) {
if (len && remain > 0)
cli_infomsg(ctx, "%s: Error decompressing stream. Not all requested input was converted\n", parent);
/* scanning inflated stream */
ret = cb(cbdata, ofd, tmpname, ctx);
} else {
/* default to scanning what we got */
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ret = cli_magic_scan_desc(ofd, tmpname, ctx, NULL, LAYER_ATTRIBUTES_NONE);
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}
/* clean-up */
dc_end:
zret = inflateEnd(&zstrm);
if (zret != Z_OK) {
cli_errmsg("%s: Error closing zlib inflation stream\n", parent);
if (ret == CL_SUCCESS)
ret = CL_EUNPACK;
}
close(ofd);
if (!ctx->engine->keeptmp)
if (cli_unlink(tmpname))
ret = CL_EUNLINK;
free(tmpname);
return ret;
}
/* convert HANGUL_NUMERICAL to UTF-8 encoding using iconv library, converts to base64 encoding if no iconv or failure */
#define HANGUL_NUMERICAL 0
static char *convert_hstr_to_utf8(const char *begin, size_t sz, const char *parent, cl_error_t *ret)
{
cl_error_t rc = CL_SUCCESS;
char *res = NULL;
#if HANGUL_NUMERICAL && HAVE_ICONV
char *p1, *p2, *inbuf = NULL, *outbuf = NULL;
size_t inlen, outlen;
iconv_t cd;
do {
p1 = inbuf = cli_calloc(1, sz + 1);
if (!inbuf) {
cli_errmsg("%s: Failed to allocate memory for encoding conversion buffer\n", parent);
rc = CL_EMEM;
break;
}
memcpy(inbuf, begin, sz);
p2 = outbuf = cli_calloc(1, sz + 1);
if (!outbuf) {
cli_errmsg("%s: Failed to allocate memory for encoding conversion buffer\n", parent);
rc = CL_EMEM;
break;
}
inlen = outlen = sz;
cd = iconv_open("UTF-8", "UNICODE");
if (cd == (iconv_t)(-1)) {
char errbuf[128];
cli_strerror(errno, errbuf, sizeof(errbuf));
cli_errmsg("%s: Failed to initialize iconv for encoding %s: %s\n", parent, HANGUL_NUMERICAL, errbuf);
break;
}
iconv(cd, (char **)(&p1), &inlen, &p2, &outlen);
iconv_close(cd);
/* no data was converted */
if (outlen == sz)
break;
outbuf[sz - outlen] = '\0';
if (!(res = strdup(outbuf))) {
cli_errmsg("%s: Failed to allocate memory for encoding conversion buffer\n", parent);
rc = CL_EMEM;
break;
}
} while (0);
if (inbuf)
free(inbuf);
if (outbuf)
free(outbuf);
#endif
/* safety base64 encoding */
if (!res && (rc == CL_SUCCESS)) {
char *tmpbuf;
tmpbuf = cli_calloc(1, sz + 1);
if (tmpbuf) {
memcpy(tmpbuf, begin, sz);
res = (char *)cl_base64_encode(tmpbuf, sz);
if (res)
rc = CL_VIRUS; /* used as placeholder */
else
rc = CL_EMEM;
free(tmpbuf);
} else {
cli_errmsg("%s: Failed to allocate memory for temporary buffer\n", parent);
rc = CL_EMEM;
}
}
(*ret) = rc;
return res;
}
/*** HWPOLE2 ***/
cl_error_t cli_scanhwpole2(cli_ctx *ctx)
{
fmap_t *map = ctx->fmap;
uint32_t usize, asize;
asize = (uint32_t)(map->len - sizeof(usize));
if (fmap_readn(map, &usize, 0, sizeof(usize)) != sizeof(usize)) {
cli_errmsg("HWPOLE2: Failed to read uncompressed ole2 filesize\n");
return CL_EREAD;
}
if (usize != asize)
cli_warnmsg("HWPOLE2: Mismatched uncompressed prefix and size: %u != %u\n", usize, asize);
else
cli_dbgmsg("HWPOLE2: Matched uncompressed prefix and size: %u == %u\n", usize, asize);
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return cli_magic_scan_nested_fmap_type(map, 4, 0, ctx,
CL_TYPE_ANY, NULL, LAYER_ATTRIBUTES_NONE);
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}
/*** HWP5 ***/
cl_error_t cli_hwp5header(cli_ctx *ctx, hwp5_header_t *hwp5)
{
if (!ctx || !hwp5)
return CL_ENULLARG;
#if HAVE_JSON
if (SCAN_COLLECT_METADATA) {
json_object *header, *flags;
header = cli_jsonobj(ctx->wrkproperty, "Hwp5Header");
if (!header) {
cli_errmsg("HWP5.x: No memory for Hwp5Header object\n");
return CL_EMEM;
}
/* version */
cli_jsonint(header, "RawVersion", hwp5->version);
/* flags */
cli_jsonint(header, "RawFlags", hwp5->flags);
flags = cli_jsonarray(header, "Flags");
if (!flags) {
cli_errmsg("HWP5.x: No memory for Hwp5Header/Flags array\n");
return CL_EMEM;
}
if (hwp5->flags & HWP5_COMPRESSED) {
cli_jsonstr(flags, NULL, "HWP5_COMPRESSED");
}
if (hwp5->flags & HWP5_PASSWORD) {
cli_jsonstr(flags, NULL, "HWP5_PASSWORD");
}
if (hwp5->flags & HWP5_DISTRIBUTABLE) {
cli_jsonstr(flags, NULL, "HWP5_DISTRIBUTABLE");
}
if (hwp5->flags & HWP5_SCRIPT) {
cli_jsonstr(flags, NULL, "HWP5_SCRIPT");
}
if (hwp5->flags & HWP5_DRM) {
cli_jsonstr(flags, NULL, "HWP5_DRM");
}
if (hwp5->flags & HWP5_XMLTEMPLATE) {
cli_jsonstr(flags, NULL, "HWP5_XMLTEMPLATE");
}
if (hwp5->flags & HWP5_HISTORY) {
cli_jsonstr(flags, NULL, "HWP5_HISTORY");
}
if (hwp5->flags & HWP5_CERT_SIGNED) {
cli_jsonstr(flags, NULL, "HWP5_CERT_SIGNED");
}
if (hwp5->flags & HWP5_CERT_ENCRYPTED) {
cli_jsonstr(flags, NULL, "HWP5_CERT_ENCRYPTED");
}
if (hwp5->flags & HWP5_CERT_EXTRA) {
cli_jsonstr(flags, NULL, "HWP5_CERT_EXTRA");
}
if (hwp5->flags & HWP5_CERT_DRM) {
cli_jsonstr(flags, NULL, "HWP5_CERT_DRM");
}
if (hwp5->flags & HWP5_CCL) {
cli_jsonstr(flags, NULL, "HWP5_CCL");
}
}
#endif
return CL_SUCCESS;
}
static cl_error_t hwp5_cb(void *cbdata, int fd, const char *filepath, cli_ctx *ctx)
{
UNUSEDPARAM(cbdata);
if (fd < 0 || !ctx)
return CL_ENULLARG;
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return cli_magic_scan_desc(fd, filepath, ctx, NULL, LAYER_ATTRIBUTES_NONE);
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}
cl_error_t cli_scanhwp5_stream(cli_ctx *ctx, hwp5_header_t *hwp5, char *name, int fd, const char *filepath)
{
hwp5_debug("HWP5.x: NAME: %s\n", name ? name : "(NULL)");
if (fd < 0) {
cli_errmsg("HWP5.x: Invalid file descriptor argument\n");
return CL_ENULLARG;
}
if (name) {
/* encrypted and compressed streams */
if (!strncmp(name, "bin", 3) || !strncmp(name, "jscriptversion", 14) ||
!strncmp(name, "defaultjscript", 14) || !strncmp(name, "section", 7) ||
!strncmp(name, "viewtext", 8) || !strncmp(name, "docinfo", 7)) {
if (hwp5->flags & HWP5_PASSWORD) {
cli_dbgmsg("HWP5.x: Password encrypted stream, scanning as-is\n");
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return cli_magic_scan_desc(fd, filepath, ctx, name, LAYER_ATTRIBUTES_NONE);
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}
if (hwp5->flags & HWP5_COMPRESSED) {
/* DocInfo JSON Handling */
STATBUF statbuf;
fmap_t *input;
cl_error_t ret;
hwp5_debug("HWP5.x: Sending %s for decompress and scan\n", name);
/* fmap the input file for easier manipulation */
if (FSTAT(fd, &statbuf) == -1) {
cli_errmsg("HWP5.x: Can't stat file descriptor\n");
return CL_ESTAT;
}
input = fmap(fd, 0, statbuf.st_size, NULL);
if (!input) {
cli_errmsg("HWP5.x: Failed to get fmap for input stream\n");
return CL_EMAP;
}
ret = decompress_and_callback(ctx, input, 0, 0, "HWP5.x", hwp5_cb, NULL);
funmap(input);
return ret;
}
}
#if HAVE_JSON
/* JSON Output Summary Information */
if (SCAN_COLLECT_METADATA && ctx->properties != NULL) {
if (name && !strncmp(name, "_5_hwpsummaryinformation", 24)) {
cli_dbgmsg("HWP5.x: Detected a '_5_hwpsummaryinformation' stream\n");
/* JSONOLE2 - what to do if something breaks? */
if (cli_ole2_summary_json(ctx, fd, 2) == CL_ETIMEOUT)
return CL_ETIMEOUT;
}
}
#endif
}
/* normal streams */
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return cli_magic_scan_desc(fd, filepath, ctx, name, LAYER_ATTRIBUTES_NONE);
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}
/*** HWP3 ***/
/* all fields use little endian and unicode encoding, if appliable */
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// File Identification Information - (30 total bytes)
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#define HWP3_IDENTITY_INFO_SIZE 30
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// Document Information - (128 total bytes)
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#define HWP3_DOCINFO_SIZE 128
#define DI_WRITEPROT 24 /* offset 24 (4 bytes) - write protection */
#define DI_EXTERNAPP 28 /* offset 28 (2 bytes) - external application */
#define DI_PNAME 32 /* offset 32 (40 x 1 bytes) - print name */
#define DI_ANNOTE 72 /* offset 72 (24 x 1 bytes) - annotation */
#define DI_PASSWD 96 /* offset 96 (2 bytes) - password protected */
#define DI_COMPRESSED 124 /* offset 124 (1 byte) - compression */
#define DI_INFOBLKSIZE 126 /* offset 126 (2 bytes) - information block length */
struct hwp3_docinfo {
uint32_t di_writeprot;
uint16_t di_externapp;
uint16_t di_passwd;
uint8_t di_compressed;
uint16_t di_infoblksize;
};
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// Document Summary - (1008 total bytes)
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#define HWP3_DOCSUMMARY_SIZE 1008
struct hwp3_docsummary_entry {
size_t offset;
const char *name;
} hwp3_docsummary_fields[] = {
{0, "Title"}, /* offset 0 (56 x 2 bytes) - title */
{112, "Subject"}, /* offset 112 (56 x 2 bytes) - subject */
{224, "Author"}, /* offset 224 (56 x 2 bytes) - author */
{336, "Date"}, /* offset 336 (56 x 2 bytes) - date */
{448, "Keyword1"}, /* offset 448 (2 x 56 x 2 bytes) - keywords */
{560, "Keyword2"},
{672, "Etc0"}, /* offset 672 (3 x 56 x 2 bytes) - etc */
{784, "Etc1"},
{896, "Etc2"}};
#define NUM_DOCSUMMARY_FIELDS sizeof(hwp3_docsummary_fields) / sizeof(struct hwp3_docsummary_entry)
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// Document Paragraph Information - (43 or 230 total bytes)
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#define HWP3_PARAINFO_SIZE_S 43
#define HWP3_PARAINFO_SIZE_L 230
#define HWP3_LINEINFO_SIZE 14
#define HWP3_CHARSHPDATA_SIZE 31
#define HWP3_FIELD_LENGTH 512
#define PI_PPFS 0 /* offset 0 (1 byte) - prior paragraph format style */
#define PI_NCHARS 1 /* offset 1 (2 bytes) - character count */
#define PI_NLINES 3 /* offset 3 (2 bytes) - line count */
#define PI_IFSC 5 /* offset 5 (1 byte) - including font style of characters */
#define PI_FLAGS 6 /* offset 6 (1 byte) - other flags */
#define PI_SPECIAL 7 /* offset 7 (4 bytes) - special characters markers */
#define PI_ISTYLE 11 /* offset 11 (1 byte) - paragraph style index */
#define PLI_LOFF 0 /* offset 0 (2 bytes) - line starting offset */
#define PLI_LCOR 2 /* offset 2 (2 bytes) - line blank correction */
#define PLI_LHEI 4 /* offset 4 (2 bytes) - line max char height */
#define PLI_LPAG 12 /* offset 12 (2 bytes) - line pagination*/
#define PCSD_SIZE 0 /* offset 0 (2 bytes) - size of characters */
#define PCSD_PROP 26 /* offset 26 (1 byte) - properties */
static inline cl_error_t parsehwp3_docinfo(cli_ctx *ctx, size_t offset, struct hwp3_docinfo *docinfo)
{
const uint8_t *hwp3_ptr;
cl_error_t iret;
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// TODO: use fmap_readn?
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if (!(hwp3_ptr = fmap_need_off_once(ctx->fmap, offset, HWP3_DOCINFO_SIZE))) {
cli_errmsg("HWP3.x: Failed to read fmap for hwp docinfo\n");
return CL_EMAP;
}
memcpy(&(docinfo->di_writeprot), hwp3_ptr + DI_WRITEPROT, sizeof(docinfo->di_writeprot));
memcpy(&(docinfo->di_externapp), hwp3_ptr + DI_EXTERNAPP, sizeof(docinfo->di_externapp));
memcpy(&(docinfo->di_passwd), hwp3_ptr + DI_PASSWD, sizeof(docinfo->di_passwd));
memcpy(&(docinfo->di_compressed), hwp3_ptr + DI_COMPRESSED, sizeof(docinfo->di_compressed));
memcpy(&(docinfo->di_infoblksize), hwp3_ptr + DI_INFOBLKSIZE, sizeof(docinfo->di_infoblksize));
docinfo->di_writeprot = le32_to_host(docinfo->di_writeprot);
docinfo->di_externapp = le16_to_host(docinfo->di_externapp);
docinfo->di_passwd = le16_to_host(docinfo->di_passwd);
docinfo->di_infoblksize = le16_to_host(docinfo->di_infoblksize);
hwp3_debug("HWP3.x: di_writeprot: %u\n", docinfo->di_writeprot);
hwp3_debug("HWP3.x: di_externapp: %u\n", docinfo->di_externapp);
hwp3_debug("HWP3.x: di_passwd: %u\n", docinfo->di_passwd);
hwp3_debug("HWP3.x: di_compressed: %u\n", docinfo->di_compressed);
hwp3_debug("HWP3.x: di_infoblksize: %u\n", docinfo->di_infoblksize);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA) {
json_object *header, *flags;
char *str;
header = cli_jsonobj(ctx->wrkproperty, "Hwp3Header");
if (!header) {
cli_errmsg("HWP3.x: No memory for Hwp3Header object\n");
return CL_EMEM;
}
flags = cli_jsonarray(header, "Flags");
if (!flags) {
cli_errmsg("HWP5.x: No memory for Hwp5Header/Flags array\n");
return CL_EMEM;
}
if (docinfo->di_writeprot) {
cli_jsonstr(flags, NULL, "HWP3_WRITEPROTECTED"); /* HWP3_DISTRIBUTABLE */
}
if (docinfo->di_externapp) {
cli_jsonstr(flags, NULL, "HWP3_EXTERNALAPPLICATION");
}
if (docinfo->di_passwd) {
cli_jsonstr(flags, NULL, "HWP3_PASSWORD");
}
if (docinfo->di_compressed) {
cli_jsonstr(flags, NULL, "HWP3_COMPRESSED");
}
/* Printed File Name */
str = convert_hstr_to_utf8((char *)(hwp3_ptr + DI_PNAME), 40, "HWP3.x", &iret);
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if (!str)
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return CL_EMEM;
if (iret == CL_VIRUS)
cli_jsonbool(header, "PrintName_base64", 1);
hwp3_debug("HWP3.x: di_pname: %s\n", str);
cli_jsonstr(header, "PrintName", str);
free(str);
/* Annotation */
str = convert_hstr_to_utf8((char *)(hwp3_ptr + DI_ANNOTE), 24, "HWP3.x", &iret);
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if (!str)
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return CL_EMEM;
if (iret == CL_VIRUS)
cli_jsonbool(header, "Annotation_base64", 1);
hwp3_debug("HWP3.x: di_annote: %s\n", str);
cli_jsonstr(header, "Annotation", str);
free(str);
}
#endif
return CL_SUCCESS;
}
static inline cl_error_t parsehwp3_docsummary(cli_ctx *ctx, size_t offset)
{
#if HAVE_JSON
const uint8_t *hwp3_ptr;
char *str;
size_t i;
cl_error_t ret, iret;
json_object *summary;
if (!SCAN_COLLECT_METADATA)
return CL_SUCCESS;
if (!(hwp3_ptr = fmap_need_off_once(ctx->fmap, offset, HWP3_DOCSUMMARY_SIZE))) {
cli_errmsg("HWP3.x: Failed to read fmap for hwp docinfo\n");
return CL_EMAP;
}
summary = cli_jsonobj(ctx->wrkproperty, "Hwp3SummaryInfo");
if (!summary) {
cli_errmsg("HWP3.x: No memory for json object\n");
return CL_EMEM;
}
for (i = 0; i < NUM_DOCSUMMARY_FIELDS; i++) {
str = convert_hstr_to_utf8((char *)(hwp3_ptr + hwp3_docsummary_fields[i].offset), 112, "HWP3.x", &iret);
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if (!str)
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return CL_EMEM;
if (iret == CL_VIRUS) {
char *b64;
size_t b64len = strlen(hwp3_docsummary_fields[i].name) + 8;
b64 = cli_calloc(1, b64len);
if (!b64) {
cli_errmsg("HWP3.x: Failed to allocate memory for b64 boolean\n");
free(str);
return CL_EMEM;
}
snprintf(b64, b64len, "%s_base64", hwp3_docsummary_fields[i].name);
cli_jsonbool(summary, b64, 1);
free(b64);
}
hwp3_debug("HWP3.x: %s, %s\n", hwp3_docsummary_fields[i].name, str);
ret = cli_jsonstr(summary, hwp3_docsummary_fields[i].name, str);
free(str);
if (ret != CL_SUCCESS)
return ret;
}
#else
UNUSEDPARAM(ctx);
UNUSEDPARAM(offset);
#endif
return CL_SUCCESS;
}
#if HWP3_VERIFY
#define HWP3_PSPECIAL_VERIFY(map, offset, second, id, match) \
do { \
if (fmap_readn(map, &match, offset + second, sizeof(match)) != sizeof(match)) \
return CL_EREAD; \
\
match = le16_to_host(match); \
\
if (id != match) { \
cli_errmsg("HWP3.x: ID %u block fails verification\n", id); \
return CL_EFORMAT; \
} \
} while (0)
#else
#define HWP3_PSPECIAL_VERIFY(map, offset, second, id, match)
#endif
static inline cl_error_t parsehwp3_paragraph(cli_ctx *ctx, fmap_t *map, int p, uint32_t level, size_t *roffset, int *last)
{
cl_error_t ret = CL_SUCCESS;
size_t offset = *roffset;
size_t new_offset;
uint16_t nchars, nlines, content;
uint8_t ppfs, ifsc, cfsb;
uint16_t i;
int c, l, sp = 0, term = 0;
#if HWP3_VERIFY
uint16_t match;
#endif
#if HWP3_DEBUG
/* other paragraph info */
uint8_t flags, istyle;
uint16_t fsize;
uint32_t special;
/* line info */
uint16_t loff, lcor, lhei, lpag;
/* char shape data */
uint16_t pcsd_size;
uint8_t pcsd_prop;
#endif
hwp3_debug("HWP3.x: recursion level: %u\n", level);
hwp3_debug("HWP3.x: Paragraph[%u, %d] starts @ offset %zu\n", level, p, offset);
if (level >= ctx->engine->maxrechwp3)
return CL_EMAXREC;
if (fmap_readn(map, &ppfs, offset + PI_PPFS, sizeof(ppfs)) != sizeof(ppfs))
return CL_EREAD;
if (fmap_readn(map, &nchars, offset + PI_NCHARS, sizeof(nchars)) != sizeof(nchars))
return CL_EREAD;
nchars = le16_to_host(nchars);
if (fmap_readn(map, &nlines, offset + PI_NLINES, sizeof(nlines)) != sizeof(nlines))
return CL_EREAD;
nlines = le16_to_host(nlines);
if (fmap_readn(map, &ifsc, offset + PI_IFSC, sizeof(ifsc)) != sizeof(ifsc))
return CL_EREAD;
hwp3_debug("HWP3.x: Paragraph[%u, %d]: ppfs %u\n", level, p, ppfs);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: nchars %u\n", level, p, nchars);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: nlines %u\n", level, p, nlines);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: ifsc %u\n", level, p, ifsc);
#if HWP3_DEBUG
if (fmap_readn(map, &flags, offset + PI_FLAGS, sizeof(flags)) != sizeof(flags))
return CL_EREAD;
if (fmap_readn(map, &special, offset + PI_SPECIAL, sizeof(special)) != sizeof(special))
return CL_EREAD;
if (fmap_readn(map, &istyle, offset + PI_ISTYLE, sizeof(istyle)) != sizeof(istyle))
return CL_EREAD;
if (fmap_readn(map, &fsize, offset + 12, sizeof(fsize)) != sizeof(fsize))
return CL_EREAD;
hwp3_debug("HWP3.x: Paragraph[%u, %d]: flags %x\n", level, p, flags);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: spcl %x\n", level, p, special);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: istyle %u\n", level, p, istyle);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: fsize %u\n", level, p, fsize);
#endif
/* detected empty paragraph marker => end-of-paragraph list */
if (nchars == 0) {
hwp3_debug("HWP3.x: Detected end-of-paragraph list @ offset %zu\n", offset);
hwp3_debug("HWP3.x: end recursion level: %u\n", level);
(*roffset) = offset + HWP3_PARAINFO_SIZE_S;
(*last) = 1;
return CL_SUCCESS;
}
if (ppfs)
offset += HWP3_PARAINFO_SIZE_S;
else
offset += HWP3_PARAINFO_SIZE_L;
/* line information blocks */
#if HWP3_DEBUG
for (i = 0; (i < nlines) && (offset < map->len); i++) {
hwp3_debug("HWP3.x: Paragraph[%u, %d]: Line %d information starts @ offset %zu\n", level, p, i, offset);
if (fmap_readn(map, &loff, offset + PLI_LOFF, sizeof(loff)) != sizeof(loff))
return CL_EREAD;
if (fmap_readn(map, &lcor, offset + PLI_LCOR, sizeof(lcor)) != sizeof(lcor))
return CL_EREAD;
if (fmap_readn(map, &lhei, offset + PLI_LHEI, sizeof(lhei)) != sizeof(lhei))
return CL_EREAD;
if (fmap_readn(map, &lpag, offset + PLI_LPAG, sizeof(lpag)) != sizeof(lpag))
return CL_EREAD;
loff = le16_to_host(loff);
lcor = le16_to_host(lcor);
lhei = le16_to_host(lhei);
lpag = le16_to_host(lpag);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: Line %d: loff %u\n", level, p, i, loff);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: Line %d: lcor %x\n", level, p, i, lcor);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: Line %d: lhei %u\n", level, p, i, lhei);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: Line %d: lpag %u\n", level, p, i, lpag);
offset += HWP3_LINEINFO_SIZE;
}
#else
new_offset = offset + (nlines * HWP3_LINEINFO_SIZE);
if ((new_offset < offset) || (new_offset >= map->len)) {
cli_errmsg("HWP3.x: Paragraph[%u, %d]: nlines value is too high, invalid. %u\n", level, p, nlines);
return CL_EPARSE;
}
offset = new_offset;
#endif
if (offset >= map->len)
return CL_EFORMAT;
if (ifsc) {
for (i = 0, c = 0; i < nchars; i++) {
/* examine byte for cs data type */
if (fmap_readn(map, &cfsb, offset, sizeof(cfsb)) != sizeof(cfsb))
return CL_EREAD;
offset += sizeof(cfsb);
switch (cfsb) {
case 0: /* character shape block */
hwp3_debug("HWP3.x: Paragraph[%u, %d]: character font style data @ offset %zu\n", level, p, offset);
#if HWP3_DEBUG
if (fmap_readn(map, &pcsd_size, offset + PCSD_SIZE, sizeof(pcsd_size)) != sizeof(pcsd_size))
return CL_EREAD;
if (fmap_readn(map, &pcsd_prop, offset + PCSD_PROP, sizeof(pcsd_prop)) != sizeof(pcsd_prop))
return CL_EREAD;
pcsd_size = le16_to_host(pcsd_size);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: CFS %u: pcsd_size %u\n", level, p, 0, pcsd_size);
hwp3_debug("HWP3.x: Paragraph[%u, %d]: CFS %u: pcsd_prop %x\n", level, p, 0, pcsd_prop);
#endif
c++;
offset += HWP3_CHARSHPDATA_SIZE;
break;
case 1: /* normal character - as representation of another character for previous cs block */
break;
default:
cli_errmsg("HWP3.x: Paragraph[%u, %d]: unknown CFS type 0x%x @ offset %zu\n", level, p, cfsb, offset);
cli_errmsg("HWP3.x: Paragraph parsing detected %d of %u characters\n", i, nchars);
return CL_EPARSE;
}
}
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected %d CFS block(s) and %d characters\n", level, p, c, i);
} else {
hwp3_debug("HWP3.x: Paragraph[%u, %d]: separate character font style segment not stored\n", level, p);
}
if (!term)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: content starts @ offset %zu\n", level, p, offset);
/* scan for end-of-paragraph [0x0d00 on offset parity to current content] */
while ((!term) &&
(offset < map->len)) {
if (fmap_readn(map, &content, offset, sizeof(content)) != sizeof(content))
return CL_EREAD;
content = le16_to_host(content);
/* special character handling */
if (content < 32) {
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected special character %u @ offset %zu\n", level, p, content, offset);
switch (content) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 12:
case 27: {
/* reserved */
uint32_t length;
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected special character as [reserved]\n", level, p);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (4 bytes) - length of information = n
* offset 6 (2 bytes) - special character ID
* offset 8 (n bytes) - information
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
if (fmap_readn(map, &length, offset + 2, sizeof(length)) != sizeof(length))
return CL_EREAD;
length = le32_to_host(length);
new_offset = offset + (8 + length);
if ((new_offset <= offset) || (new_offset > map->len)) {
cli_errmsg("HWP3.x: Paragraph[%u, %d]: length value is too high, invalid. %u\n", level, p, length);
return CL_EPARSE;
}
offset = new_offset;
#if HWP3_DEBUG
cli_errmsg("HWP3.x: Paragraph[%u, %d]: possible invalid usage of reserved special character %u\n", level, p, content);
return CL_EFORMAT;
#endif
break;
}
case 5: /* field codes */
{
uint32_t length;
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected field code marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (4 bytes) - length of information = n
* offset 6 (2 bytes) - special character ID
* offset 8 (n bytes) - field code details
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
if (fmap_readn(map, &length, offset + 2, sizeof(length)) != sizeof(length))
return CL_EREAD;
length = le32_to_host(length);
new_offset = offset + (8 + length);
if ((new_offset <= offset) || (new_offset > map->len)) {
cli_errmsg("HWP3.x: Paragraph[%u, %d]: length value is too high, invalid. %u\n", level, p, length);
return CL_EPARSE;
}
offset = new_offset;
break;
}
case 6: /* bookmark */
{
#if HWP3_VERIFY
uint32_t length;
#endif
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected bookmark marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (4 bytes) - length of information = 34
* offset 6 (2 bytes) - special character ID
* offset 8 (16 x 2 bytes) - bookmark name
* offset 40 (2 bytes) - bookmark type
* total is always 42 bytes
*/
#if HWP3_VERIFY
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
/* length check - always 34 bytes */
if (fmap_readn(map, &length, offset + 2, sizeof(length)) != sizeof(length))
return CL_EREAD;
length = le32_to_host(length);
if (length != 34) {
cli_errmsg("HWP3.x: Bookmark has incorrect length: %u != 34)\n", length);
return CL_EFORMAT;
}
#endif
offset += 42;
break;
}
case 7: /* date format */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected date format marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (40 x 2 bytes) - date format as user-defined dialog
* offset 82 (2 bytes) - special character ID
* total is always 84 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 82, content, match);
offset += 84;
break;
}
case 8: /* date code */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected date code marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (40 x 2 bytes) - date format string
* offset 82 (4 x 2 bytes) - date (year, month, day of week)
* offset 90 (2 x 2 bytes) - time (hour, minute)
* offset 94 (2 bytes) - special character ID
* total is always 96 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 94, content, match);
offset += 96;
break;
}
case 9: /* tab */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected tab marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - tab width
* offset 4 (2 bytes) - unknown(?)
* offset 6 (2 bytes) - special character ID
* total is always 8 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
offset += 8;
break;
}
case 10: /* table, test box, equation, button, hypertext */
{
uint16_t ncells;
#if HWP3_DEBUG
uint16_t type;
#endif
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected box object marker @ offset %zu\n", level, p, offset);
/* verification (only on HWP3_VERIFY) */
/* id block verify */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
/* extra data block verify */
HWP3_PSPECIAL_VERIFY(map, offset, 24, content, match);
/* ID block is 8 bytes */
offset += 8;
/* box information (84 bytes) */
#if HWP3_DEBUG
/* box type located at offset 78 of box information */
if (fmap_readn(map, &type, offset + 78, sizeof(type)) != sizeof(type))
return CL_EREAD;
type = le16_to_host(type);
if (type == 0)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: box object detected as table\n", level, p);
else if (type == 1)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: box object detected as text box\n", level, p);
else if (type == 2)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: box object detected as equation\n", level, p);
else if (type == 3)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: box object detected as button\n", level, p);
else
hwp3_debug("HWP3.x: Paragraph[%u, %d]: box object detected as UNKNOWN(%u)\n", level, p, type);
#endif
/* ncells is located at offset 80 of box information */
if (fmap_readn(map, &ncells, offset + 80, sizeof(ncells)) != sizeof(ncells))
return CL_EREAD;
ncells = le16_to_host(ncells);
offset += 84;
hwp3_debug("HWP3.x: Paragraph[%u, %d]: box object contains %u cell(s)\n", level, p, ncells);
/* cell information (27 bytes x ncells(offset 80 of table)) */
hwp3_debug("HWP3.x: Paragraph[%u, %d]: box cell info array starts @ %zu\n", level, p, offset);
new_offset = offset + (27 * ncells);
if ((new_offset < offset) || (new_offset >= map->len)) {
cli_errmsg("HWP3.x: Paragraph[%u, %d]: number of box cells is too high, invalid. %u\n", level, p, ncells);
return CL_EPARSE;
}
offset = new_offset;
/* cell paragraph list */
hwp3_debug("HWP3.x: Paragraph[%u, %d]: box cell paragraph list starts @ %zu\n", level, p, offset);
for (i = 0; i < ncells; i++) {
l = 0;
while (!l && ((ret = parsehwp3_paragraph(ctx, map, sp++, level + 1, &offset, &l)) == CL_SUCCESS)) continue;
if (ret != CL_SUCCESS)
return ret;
}
/* box caption paragraph list */
hwp3_debug("HWP3.x: Paragraph[%u, %d]: box cell caption paragraph list starts @ %zu\n", level, p, offset);
l = 0;
while (!l && ((ret = parsehwp3_paragraph(ctx, map, sp++, level + 1, &offset, &l)) == CL_SUCCESS)) continue;
if (ret != CL_SUCCESS)
return ret;
break;
}
case 11: /* drawing */
{
uint32_t size;
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected drawing marker @ offset %zu\n", level, p, offset);
/* verification (only on HWP3_VERIFY) */
/* id block verify */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
/* extra data block verify */
HWP3_PSPECIAL_VERIFY(map, offset, 24, content, match);
/* ID block is 8 bytes */
offset += 8;
/* Drawing Info Block is 328+n bytes with n = size of image */
/* n is located at offset 0 of info block */
if (fmap_readn(map, &size, offset, sizeof(size)) != sizeof(size))
return CL_EREAD;
hwp3_debug("HWP3.x: Paragraph[%u, %d]: drawing is %u additional bytes\n", level, p, size);
size = le32_to_host(size);
new_offset = offset + (348 + size);
if ((new_offset <= offset) || (new_offset >= map->len)) {
cli_errmsg("HWP3.x: Paragraph[%u, %d]: image size value is too high, invalid. %u\n", level, p, size);
return CL_EPARSE;
}
offset = new_offset;
/* caption paragraph list */
hwp3_debug("HWP3.x: Paragraph[%u, %d]: drawing caption paragraph list starts @ %zu\n", level, p, offset);
l = 0;
while (!l && ((ret = parsehwp3_paragraph(ctx, map, sp++, level + 1, &offset, &l)) == CL_SUCCESS)) continue;
if (ret != CL_SUCCESS)
return ret;
break;
}
case 13: /* end-of-paragraph marker - treated identically as character */
hwp3_debug("HWP3.x: Detected end-of-paragraph marker @ offset %zu\n", offset);
term = 1;
offset += sizeof(content);
break;
case 14: /* line information */
{
hwp3_debug("HWP3.x: Detected line information marker @ offset %zu\n", offset);
/* verification (only on HWP3_VERIFY) */
/* id block verify */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
/* extra data block verify */
HWP3_PSPECIAL_VERIFY(map, offset, 24, content, match);
/* ID block is 8 bytes + line information is always 84 bytes */
offset += 92;
break;
}
case 15: /* hidden description */
{
hwp3_debug("HWP3.x: Detected hidden description marker @ offset %zu\n", offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (4 bytes) - reserved
* offset 6 (2 bytes) - special character ID
* offset 8 (8 bytes) - reserved
* total is always 16 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
offset += 16;
/* hidden description paragraph list */
hwp3_debug("HWP3.x: Paragraph[%u, %d]: hidden description paragraph list starts @ %zu\n", level, p, offset);
l = 0;
while (!l && ((ret = parsehwp3_paragraph(ctx, map, sp++, level + 1, &offset, &l)) == CL_SUCCESS)) continue;
if (ret != CL_SUCCESS)
return ret;
break;
}
case 16: /* header/footer */
{
#if HWP3_DEBUG
uint8_t type;
#endif
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected header/footer marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (4 bytes) - reserved
* offset 6 (2 bytes) - special character ID
* offset 8 (8 x 1 byte) - reserved
* offset 16 (1 byte) - type (header/footer)
* offset 17 (1 byte) - kind
* total is always 18 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
#if HWP3_DEBUG
if (fmap_readn(map, &type, offset + 16, sizeof(type)) != sizeof(type))
return CL_EREAD;
if (type == 0)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected header/footer as header\n", level, p);
else if (type == 1)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected header/footer as footer\n", level, p);
else
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected header/footer as UNKNOWN(%u)\n", level, p, type);
#endif
offset += 18;
/* content paragraph list */
hwp3_debug("HWP3.x: Paragraph[%u, %d]: header/footer paragraph list starts @ %zu\n", level, p, offset);
l = 0;
while (!l && ((ret = parsehwp3_paragraph(ctx, map, sp++, level + 1, &offset, &l)) == CL_SUCCESS)) continue;
if (ret != CL_SUCCESS)
return ret;
break;
}
case 17: /* footnote/endnote */
{
hwp3_debug("HWP3.x: Detected footnote/endnote marker @ offset %zu\n", offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (4 bytes) - reserved
* offset 6 (2 bytes) - special character ID
* offset 8 (8 x 1 bytes) - reserved
* offset 16 (2 bytes) - number
* offset 18 (2 bytes) - type
* offset 20 (2 bytes) - alignment
* total is always 22 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
offset += 22;
/* content paragraph list */
hwp3_debug("HWP3.x: Paragraph[%u, %d]: footnote/endnote paragraph list starts @ %zu\n", level, p, offset);
l = 0;
while (!l && ((ret = parsehwp3_paragraph(ctx, map, sp++, level + 1, &offset, &l)) == CL_SUCCESS)) continue;
if (ret != CL_SUCCESS)
return ret;
break;
}
case 18: /* paste code number */
{
#if HWP3_DEBUG
uint8_t type;
#endif
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected paste code number marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - type
* offset 4 (2 bytes) - number value
* offset 6 (2 bytes) - special character ID
* total is always 8 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
#if HWP3_DEBUG
if (fmap_readn(map, &type, offset + 2, sizeof(type)) != sizeof(type))
return CL_EREAD;
if (type == 0)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected paste code number as side\n", level, p);
else if (type == 1)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected paste code number as footnote\n", level, p);
else if (type == 2)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected paste code number as North America???\n", level, p);
else if (type == 3)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected paste code number as drawing\n", level, p);
else if (type == 4)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected paste code number as table\n", level, p);
else if (type == 5)
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected paste code number as equation\n", level, p);
else
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected paste code number as UNKNOWN(%u)\n", level, p, type);
#endif
offset += 8;
break;
}
case 19: /* code number change */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected code number change marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - type
* offset 4 (2 bytes) - new number value
* offset 6 (2 bytes) - special character ID
* total is always 8 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
offset += 8;
break;
}
case 20: {
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected thread page number marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - location
* offset 4 (2 bytes) - shape
* offset 6 (2 bytes) - special character ID
* total is always 8 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
offset += 8;
break;
}
case 21: /* hide special */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected hide special marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - type
* offset 4 (2 bytes) - target
* offset 6 (2 bytes) - special character ID
* total is always 8 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
offset += 8;
break;
}
case 22: /* mail merge display */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected mail merge display marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (20 x 1 bytes) - field name (in ASCII)
* offset 22 (2 bytes) - special character ID
* total is always 24 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 22, content, match);
offset += 24;
break;
}
case 23: /* overlapping letters */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected overlapping marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (3 x 2 bytes) - overlapping letters
* offset 8 (2 bytes) - special character ID
* total is always 10 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 8, content, match);
offset += 10;
break;
}
case 24: /* hyphen */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected hyphen marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - width of hyphen
* offset 4 (2 bytes) - special character ID
* total is always 6 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 4, content, match);
offset += 6;
break;
}
case 25: /* title/table/picture show times */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected title/table/picture show times marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - type
* offset 4 (2 bytes) - special character ID
* total is always 6 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 4, content, match);
offset += 6;
break;
}
case 26: /* browse displayed */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected browse displayed marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (60 x 2 bytes) - keyword 1
* offset 122 (60 x 2 bytes) - keyword 2
* offset 242 (2 bytes) - page number
* offset 244 (2 bytes) - special character ID
* total is always 246 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 244, content, match);
offset += 246;
break;
}
case 28: /* overview shape/summary number */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected overview shape/summary number marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - type
* offset 4 (1 byte) - form
* offset 5 (1 byte) - step
* offset 6 (7 x 2 bytes) - summary number
* offset 20 (7 x 2 bytes) - custom
* offset 34 (2 x 7 x 2 bytes) - decorative letters
* offset 62 (2 bytes) - special character ID
* total is always 64 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 62, content, match);
offset += 64;
break;
}
case 29: /* cross-reference */
{
uint32_t length;
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected cross-reference marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (4 bytes) - length of information
* offset 6 (2 bytes) - special character ID
* offset 8 (n bytes) - ...
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 6, content, match);
if (fmap_readn(map, &length, offset + 2, sizeof(length)) != sizeof(length))
return CL_EREAD;
length = le32_to_host(length);
new_offset = offset + (8 + length);
if ((new_offset <= offset) || (new_offset > map->len)) {
cli_errmsg("HWP3.x: Paragraph[%u, %d]: length value is too high, invalid. %u\n", level, p, length);
return CL_EPARSE;
}
offset = new_offset;
break;
}
case 30: /* bundle of blanks (ON SALE for 2.99!) */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected title/table/picture show times marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - special character ID
* total is always 4 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 2, content, match);
offset += 4;
break;
}
case 31: /* fixed-width space */
{
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected title/table/picture show times marker @ offset %zu\n", level, p, offset);
/*
* offset 0 (2 bytes) - special character ID
* offset 2 (2 bytes) - special character ID
* total is always 4 bytes
*/
/* id block verification (only on HWP3_VERIFY) */
HWP3_PSPECIAL_VERIFY(map, offset, 2, content, match);
offset += 4;
break;
}
default:
hwp3_debug("HWP3.x: Paragraph[%u, %d]: detected special character as [UNKNOWN]\n", level, p);
cli_errmsg("HWP3.x: Paragraph[%u, %d]: cannot understand special character %u\n", level, p, content);
return CL_EPARSE;
}
} else { /* normal characters */
offset += sizeof(content);
}
}
hwp3_debug("HWP3.x: end recursion level: %d\n", level);
(*roffset) = offset;
return CL_SUCCESS;
}
static inline cl_error_t parsehwp3_infoblk_1(cli_ctx *ctx, fmap_t *dmap, size_t *offset, int *last)
{
cl_error_t ret = CL_SUCCESS;
uint32_t infoid, infolen;
fmap_t *map = (dmap ? dmap : ctx->fmap);
int i, count;
long long unsigned infoloc = (long long unsigned)(*offset);
#if HWP3_DEBUG
char field[HWP3_FIELD_LENGTH];
#endif
#if HAVE_JSON
json_object *infoblk_1, *contents, *counter, *entry;
#endif
hwp3_debug("HWP3.x: Information Block @ offset %llu\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA) {
infoblk_1 = cli_jsonobj(ctx->wrkproperty, "InfoBlk_1");
if (!infoblk_1) {
cli_errmsg("HWP5.x: No memory for information block object\n");
return CL_EMEM;
}
contents = cli_jsonarray(infoblk_1, "Contents");
if (!contents) {
cli_errmsg("HWP5.x: No memory for information block contents array\n");
return CL_EMEM;
}
if (!json_object_object_get_ex(infoblk_1, "Count", &counter)) { /* object not found */
cli_jsonint(infoblk_1, "Count", 1);
} else {
int value = json_object_get_int(counter);
cli_jsonint(infoblk_1, "Count", value + 1);
}
}
#endif
if (fmap_readn(map, &infoid, *offset, sizeof(infoid)) != sizeof(infoid)) {
cli_errmsg("HWP3.x: Failed to read information block id @ %zu\n", *offset);
return CL_EREAD;
}
*offset += sizeof(infoid);
infoid = le32_to_host(infoid);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA) {
entry = cli_jsonobj(contents, NULL);
if (!entry) {
cli_errmsg("HWP5.x: No memory for information block entry object\n");
return CL_EMEM;
}
cli_jsonint(entry, "ID", infoid);
}
#endif
hwp3_debug("HWP3.x: Information Block[%llu]: ID: %u\n", infoloc, infoid);
/* Booking Information(5) - no length field and no content */
if (infoid == 5) {
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: Booking Information\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonstr(entry, "Type", "Booking Information");
#endif
return CL_SUCCESS;
}
if (fmap_readn(map, &infolen, *offset, sizeof(infolen)) != sizeof(infolen)) {
cli_errmsg("HWP3.x: Failed to read information block len @ %zu\n", *offset);
return CL_EREAD;
}
*offset += sizeof(infolen);
infolen = le32_to_host(infolen);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA) {
cli_jsonint64(entry, "Offset", infoloc);
cli_jsonint(entry, "Length", infolen);
}
#endif
hwp3_debug("HWP3.x: Information Block[%llu]: LEN: %u\n", infoloc, infolen);
/* check information block bounds */
if (*offset + infolen > map->len) {
cli_errmsg("HWP3.x: Information blocks length exceeds remaining map length, %zu > %zu\n", *offset + infolen, map->len);
return CL_EREAD;
}
/* Information Blocks */
switch (infoid) {
case 0: /* Terminating */
if (infolen == 0) {
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: Terminating Entry\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonstr(entry, "Type", "Terminating Entry");
#endif
if (last) *last = 1;
return CL_SUCCESS;
} else {
cli_errmsg("HWP3.x: Information Block[%llu]: TYPE: Invalid Terminating Entry\n", infoloc);
return CL_EFORMAT;
}
case 1: /* Image Data */
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: Image Data\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonstr(entry, "Type", "Image Data");
#endif
#if HWP3_DEBUG /* additional fields can be added */
memset(field, 0, HWP3_FIELD_LENGTH);
if (fmap_readn(map, field, *offset, 16) != 16) {
cli_errmsg("HWP3.x: Failed to read information block field @ %zu\n", *offset);
return CL_EREAD;
}
hwp3_debug("HWP3.x: Information Block[%llu]: NAME: %s\n", infoloc, field);
memset(field, 0, HWP3_FIELD_LENGTH);
if (fmap_readn(map, field, *offset + 16, 16) != 16) {
cli_errmsg("HWP3.x: Failed to read information block field @ %zu\n", *offset);
return CL_EREAD;
}
hwp3_debug("HWP3.x: Information Block[%llu]: FORM: %s\n", infoloc, field);
#endif
/* 32 bytes for extra data fields */
if (infolen > 0)
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ret = cli_magic_scan_nested_fmap_type(map, *offset + 32, infolen - 32, ctx,
CL_TYPE_ANY, NULL, LAYER_ATTRIBUTES_NONE);
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break;
case 2: /* OLE2 Data */
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: OLE2 Data\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonstr(entry, "Type", "OLE2 Data");
#endif
if (infolen > 0)
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ret = cli_magic_scan_nested_fmap_type(map, *offset, infolen, ctx,
CL_TYPE_ANY, NULL, LAYER_ATTRIBUTES_NONE);
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break;
case 3: /* Hypertext/Hyperlink Information */
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: Hypertext/Hyperlink Information\n", infoloc);
if (infolen % 617) {
cli_errmsg("HWP3.x: Information Block[%llu]: Invalid multiple of 617 => %u\n", infoloc, infolen);
return CL_EFORMAT;
}
count = (infolen / 617);
hwp3_debug("HWP3.x: Information Block[%llu]: COUNT: %d entries\n", infoloc, count);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA) {
cli_jsonstr(entry, "Type", "Hypertext/Hyperlink Information");
cli_jsonint(entry, "Count", count);
}
#endif
for (i = 0; i < count; i++) {
#if HWP3_DEBUG /* additional fields can be added */
memset(field, 0, HWP3_FIELD_LENGTH);
if (fmap_readn(map, field, *offset, 256) != 256) {
cli_errmsg("HWP3.x: Failed to read information block field @ %zu\n", *offset);
return CL_EREAD;
}
hwp3_debug("HWP3.x: Information Block[%llu]: %d: NAME: %s\n", infoloc, i, field);
#endif
/* scanning macros - TODO - check numbers */
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ret = cli_magic_scan_nested_fmap_type(map, *offset + (617 * i) + 288, 325, ctx,
CL_TYPE_ANY, NULL, LAYER_ATTRIBUTES_NONE);
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}
break;
case 4: /* Presentation Information */
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: Presentation Information\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonstr(entry, "Type", "Presentation Information");
#endif
/* contains nothing of interest to scan */
break;
case 5: /* Booking Information */
/* should never run this as it is short-circuited above */
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: Booking Information\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonstr(entry, "Type", "Booking Information");
#endif
break;
case 6: /* Background Image Data */
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: Background Image Data\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA) {
cli_jsonstr(entry, "Type", "Background Image Data");
cli_jsonint(entry, "ImageSize", infolen - 324);
}
#endif
#if HWP3_DEBUG /* additional fields can be added */
memset(field, 0, HWP3_FIELD_LENGTH);
if (fmap_readn(map, field, *offset + 24, 256) != 256) {
cli_errmsg("HWP3.x: Failed to read information block field @ %zu\n", *offset);
return CL_EREAD;
}
hwp3_debug("HWP3.x: Information Block[%llu]: NAME: %s\n", infoloc, field);
#endif
/* 324 bytes for extra data fields */
if (infolen > 0)
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ret = cli_magic_scan_nested_fmap_type(map, *offset + 324, infolen - 324, ctx,
CL_TYPE_ANY, NULL, LAYER_ATTRIBUTES_NONE);
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break;
case 0x100: /* Table Extension */
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: Table Extension\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonstr(entry, "Type", "Table Extension");
#endif
/* contains nothing of interest to scan */
break;
case 0x101: /* Press Frame Information Field Name */
hwp3_debug("HWP3.x: Information Block[%llu]: TYPE: Press Frame Information Field Name\n", infoloc);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonstr(entry, "Type", "Press Frame Information Field Name");
#endif
/* contains nothing of interest to scan */
break;
default:
cli_warnmsg("HWP3.x: Information Block[%llu]: TYPE: UNKNOWN(%u)\n", infoloc, infoid);
if (infolen > 0)
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ret = cli_magic_scan_nested_fmap_type(map, *offset, infolen, ctx,
CL_TYPE_ANY, NULL, LAYER_ATTRIBUTES_NONE);
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}
*offset += infolen;
return ret;
}
static cl_error_t hwp3_cb(void *cbdata, int fd, const char *filepath, cli_ctx *ctx)
{
cl_error_t ret = CL_SUCCESS;
fmap_t *map, *dmap;
size_t offset, start, new_offset;
int i, p = 0, last = 0;
uint16_t nstyles;
#if HAVE_JSON
json_object *fonts;
#endif
UNUSEDPARAM(filepath);
offset = start = cbdata ? *(size_t *)cbdata : 0;
if (offset == 0) {
if (fd < 0) {
cli_errmsg("HWP3.x: Invalid file descriptor argument\n");
return CL_ENULLARG;
} else {
STATBUF statbuf;
if (FSTAT(fd, &statbuf) == -1) {
cli_errmsg("HWP3.x: Can't stat file descriptor\n");
return CL_ESTAT;
}
map = dmap = fmap(fd, 0, statbuf.st_size, NULL);
if (!map) {
cli_errmsg("HWP3.x: Failed to get fmap for uncompressed stream\n");
return CL_EMAP;
}
}
} else {
hwp3_debug("HWP3.x: Document Content Stream starts @ offset %zu\n", offset);
map = ctx->fmap;
dmap = NULL;
}
/* Fonts - 7 entries of 2 + (n x 40) bytes where n is the first 2 bytes of the entry */
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
fonts = cli_jsonarray(ctx->wrkproperty, "FontCounts");
#endif
for (i = 0; i < 7; i++) {
uint16_t nfonts;
if (fmap_readn(map, &nfonts, offset, sizeof(nfonts)) != sizeof(nfonts)) {
if (dmap)
funmap(dmap);
return CL_EREAD;
}
nfonts = le16_to_host(nfonts);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonint(fonts, NULL, nfonts);
#endif
hwp3_debug("HWP3.x: Font Entry %d with %u entries @ offset %zu\n", i + 1, nfonts, offset);
new_offset = offset + (2 + nfonts * 40);
if ((new_offset <= offset) || (new_offset >= map->len)) {
cli_errmsg("HWP3.x: Font Entry: number of fonts is too high, invalid. %u\n", nfonts);
if (dmap)
funmap(dmap);
return CL_EPARSE;
}
offset = new_offset;
}
/* Styles - 2 + (n x 238) bytes where n is the first 2 bytes of the section */
if (fmap_readn(map, &nstyles, offset, sizeof(nstyles)) != sizeof(nstyles)) {
if (dmap)
funmap(dmap);
return CL_EREAD;
}
nstyles = le16_to_host(nstyles);
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonint(ctx->wrkproperty, "StyleCount", nstyles);
#endif
hwp3_debug("HWP3.x: %u Styles @ offset %zu\n", nstyles, offset);
new_offset = offset + (2 + nstyles * 238);
if ((new_offset <= offset) || (new_offset >= map->len)) {
cli_errmsg("HWP3.x: Font Entry: number of font styles is too high, invalid. %u\n", nstyles);
if (dmap)
funmap(dmap);
return CL_EPARSE;
}
offset += (2 + nstyles * 238);
last = 0;
/* Paragraphs - variable */
/* Paragraphs - are terminated with 0x0d00[13(CR) as hchar], empty paragraph marks end of section and do NOT end with 0x0d00 */
while (!last && ((ret = parsehwp3_paragraph(ctx, map, p++, 0, &offset, &last)) == CL_SUCCESS)) continue;
/* return is never a virus */
if (ret != CL_SUCCESS) {
if (dmap)
funmap(dmap);
return ret;
}
#if HAVE_JSON
if (SCAN_COLLECT_METADATA)
cli_jsonint(ctx->wrkproperty, "ParagraphCount", p);
#endif
last = 0;
/* 'additional information block #1's - attachments and media */
while (!last && ((ret = parsehwp3_infoblk_1(ctx, map, &offset, &last)) == CL_SUCCESS)) continue;
/* scan the uncompressed stream - both compressed and uncompressed cases [ALLMATCH] */
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if (ret == CL_SUCCESS) {
size_t dlen = offset - start;
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ret = cli_magic_scan_nested_fmap_type(map, start, dlen, ctx, CL_TYPE_ANY, NULL, LAYER_ATTRIBUTES_NONE);
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}
if (dmap)
funmap(dmap);
return ret;
}
cl_error_t cli_scanhwp3(cli_ctx *ctx)
{
cl_error_t ret = CL_SUCCESS;
struct hwp3_docinfo docinfo;
size_t offset = 0, new_offset = 0;
fmap_t *map = ctx->fmap;
#if HAVE_JSON
/*
// version
cli_jsonint(header, "RawVersion", hwp5->version);
*/
#endif
offset += HWP3_IDENTITY_INFO_SIZE;
if ((ret = parsehwp3_docinfo(ctx, offset, &docinfo)) != CL_SUCCESS)
return ret;
offset += HWP3_DOCINFO_SIZE;
if ((ret = parsehwp3_docsummary(ctx, offset)) != CL_SUCCESS)
return ret;
offset += HWP3_DOCSUMMARY_SIZE;
/* password-protected document - cannot parse */
if (docinfo.di_passwd) {
cli_dbgmsg("HWP3.x: password-protected file, skip parsing\n");
return CL_SUCCESS;
}
if (docinfo.di_infoblksize) {
/* OPTIONAL TODO: HANDLE OPTIONAL INFORMATION BLOCK #0's FOR PRECLASS */
new_offset = offset + docinfo.di_infoblksize;
if ((new_offset <= offset) || (new_offset >= map->len)) {
cli_errmsg("HWP3.x: Doc info block size is too high, invalid. %u\n", docinfo.di_infoblksize);
return CL_EPARSE;
}
offset = new_offset;
}
if (docinfo.di_compressed)
ret = decompress_and_callback(ctx, ctx->fmap, offset, 0, "HWP3.x", hwp3_cb, NULL);
else
ret = hwp3_cb(&offset, 0, ctx->sub_filepath, ctx);
if (ret != CL_SUCCESS)
return ret;
/* OPTIONAL TODO: HANDLE OPTIONAL ADDITIONAL INFORMATION BLOCK #2's FOR PRECLASS*/
return ret;
}
/*** HWPML (hijacking the msxml parser) ***/
#if HAVE_LIBXML2
static const struct key_entry hwpml_keys[] = {
{"hwpml", "HWPML", MSXML_JSON_ROOT | MSXML_JSON_ATTRIB},
/* HEAD - Document Properties */
//{ "head", "Head", MSXML_JSON_WRKPTR },
{"docsummary", "DocumentProperties", MSXML_JSON_WRKPTR},
{"title", "Title", MSXML_JSON_WRKPTR | MSXML_JSON_VALUE},
{"author", "Author", MSXML_JSON_WRKPTR | MSXML_JSON_VALUE},
{"date", "Date", MSXML_JSON_WRKPTR | MSXML_JSON_VALUE},
{"docsetting", "DocumentSettings", MSXML_JSON_WRKPTR},
{"beginnumber", "BeginNumber", MSXML_JSON_WRKPTR | MSXML_JSON_ATTRIB},
{"caretpos", "CaretPos", MSXML_JSON_WRKPTR | MSXML_JSON_ATTRIB},
//{ "bindatalist", "BinDataList", MSXML_JSON_WRKPTR },
//{ "binitem", "BinItem", MSXML_JSON_WRKPTR | MSXML_JSON_ATTRIB },
{"facenamelist", "FaceNameList", MSXML_IGNORE_ELEM}, /* fonts list */
{"borderfilllist", "BorderFillList", MSXML_IGNORE_ELEM}, /* borders list */
{"charshapelist", "CharShapeList", MSXML_IGNORE_ELEM}, /* character shapes */
{"tabdeflist", "TableDefList", MSXML_IGNORE_ELEM}, /* table defs */
{"numberinglist", "NumberingList", MSXML_IGNORE_ELEM}, /* numbering list */
{"parashapelist", "ParagraphShapeList", MSXML_IGNORE_ELEM}, /* paragraph shapes */
{"stylelist", "StyleList", MSXML_IGNORE_ELEM}, /* styles */
{"compatibledocument", "WordCompatibility", MSXML_IGNORE_ELEM}, /* word compatibility data */
/* BODY - Document Contents */
{"body", "Body", MSXML_IGNORE_ELEM}, /* document contents (we could build a document contents summary */
/* TAIL - Document Attachments */
//{ "tail", "Tail", MSXML_JSON_WRKPTR },
{"bindatastorage", "BinaryDataStorage", MSXML_JSON_WRKPTR},
{"bindata", "BinaryData", MSXML_SCAN_CB | MSXML_JSON_WRKPTR | MSXML_JSON_ATTRIB},
{"scriptcode", "ScriptCodeStorage", MSXML_JSON_WRKPTR | MSXML_JSON_ATTRIB},
{"scriptheader", "ScriptHeader", MSXML_SCAN_CB | MSXML_JSON_WRKPTR | MSXML_JSON_VALUE},
{"scriptsource", "ScriptSource", MSXML_SCAN_CB | MSXML_JSON_WRKPTR | MSXML_JSON_VALUE}};
static size_t num_hwpml_keys = sizeof(hwpml_keys) / sizeof(struct key_entry);
/* binary streams needs to be base64-decoded then decompressed if fields are set */
static cl_error_t hwpml_scan_cb(void *cbdata, int fd, const char *filepath, cli_ctx *ctx)
{
UNUSEDPARAM(cbdata);
if (fd < 0 || !ctx)
return CL_ENULLARG;
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return cli_magic_scan_desc(fd, filepath, ctx, NULL, LAYER_ATTRIBUTES_NONE);
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}
static cl_error_t hwpml_binary_cb(int fd, const char *filepath, cli_ctx *ctx, int num_attribs, struct attrib_entry *attribs, void *cbdata)
{
cl_error_t ret;
int i, df = 0, com = 0, enc = 0;
char *tempfile;
UNUSEDPARAM(cbdata);
/* check attributes for compression and encoding */
for (i = 0; i < num_attribs; i++) {
if (!strcmp(attribs[i].key, "Compress")) {
if (!strcmp(attribs[i].value, "true"))
com = 1;
else if (!strcmp(attribs[i].value, "false"))
com = 0;
else
com = -1;
}
if (!strcmp(attribs[i].key, "Encoding")) {
if (!strcmp(attribs[i].value, "Base64"))
enc = 1;
else
enc = -1;
}
}
hwpml_debug("HWPML: Checking attributes: com: %d, enc: %d\n", com, enc);
/* decode the binary data if needed - base64 */
if (enc < 0) {
cli_errmsg("HWPML: Unrecognized encoding method\n");
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return cli_magic_scan_desc(fd, filepath, ctx, NULL, LAYER_ATTRIBUTES_NONE);
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} else if (enc == 1) {
STATBUF statbuf;
fmap_t *input;
const char *instream;
char *decoded;
size_t decodedlen;
hwpml_debug("HWPML: Decoding base64-encoded binary data\n");
/* fmap the input file for easier manipulation */
if (FSTAT(fd, &statbuf) == -1) {
cli_errmsg("HWPML: Can't stat file descriptor\n");
return CL_ESTAT;
}
if (!(input = fmap(fd, 0, statbuf.st_size, NULL))) {
cli_errmsg("HWPML: Failed to get fmap for binary data\n");
return CL_EMAP;
}
/* send data for base64 conversion - TODO: what happens with really big files? */
if (!(instream = fmap_need_off_once(input, 0, input->len))) {
cli_errmsg("HWPML: Failed to get input stream from binary data\n");
funmap(input);
return CL_EMAP;
}
decoded = (char *)cl_base64_decode((char *)instream, input->len, NULL, &decodedlen, 0);
funmap(input);
if (!decoded) {
cli_errmsg("HWPML: Failed to get base64 decode binary data\n");
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return cli_magic_scan_desc(fd, filepath, ctx, NULL, LAYER_ATTRIBUTES_NONE);
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}
/* open file for writing and scanning */
if ((ret = cli_gentempfd(ctx->sub_tmpdir, &tempfile, &df)) != CL_SUCCESS) {
cli_warnmsg("HWPML: Failed to create temporary file for decoded stream scanning\n");
return ret;
}
if (cli_writen(df, decoded, decodedlen) != decodedlen) {
free(decoded);
ret = CL_EWRITE;
goto hwpml_end;
}
free(decoded);
/* keeps the later logic simpler */
fd = df;
cli_dbgmsg("HWPML: Decoded binary data to %s\n", tempfile);
}
/* decompress the file if needed - zlib */
if (com) {
STATBUF statbuf;
fmap_t *input;
hwpml_debug("HWPML: Decompressing binary data\n");
/* fmap the input file for easier manipulation */
if (FSTAT(fd, &statbuf) == -1) {
cli_errmsg("HWPML: Can't stat file descriptor\n");
ret = CL_ESTAT;
goto hwpml_end;
}
input = fmap(fd, 0, statbuf.st_size, NULL);
if (!input) {
cli_errmsg("HWPML: Failed to get fmap for binary data\n");
ret = CL_EMAP;
goto hwpml_end;
}
ret = decompress_and_callback(ctx, input, 0, 0, "HWPML", hwpml_scan_cb, NULL);
funmap(input);
} else {
if (fd == df) { /* fd is a decoded tempfile */
ret = hwpml_scan_cb(NULL, fd, tempfile, ctx);
} else { /* fd is the original filepath, no decoding necessary */
ret = hwpml_scan_cb(NULL, fd, filepath, ctx);
}
}
/* close decoded file descriptor if used */
hwpml_end:
if (df) {
close(df);
if (!(ctx->engine->keeptmp))
cli_unlink(tempfile);
free(tempfile);
}
return ret;
}
#endif /* HAVE_LIBXML2 */
cl_error_t cli_scanhwpml(cli_ctx *ctx)
{
cl_error_t ret = CL_SUCCESS;
#if HAVE_LIBXML2
struct msxml_cbdata cbdata;
struct msxml_ctx mxctx;
xmlTextReaderPtr reader = NULL;
cli_dbgmsg("in cli_scanhwpml()\n");
if (!ctx)
return CL_ENULLARG;
memset(&cbdata, 0, sizeof(cbdata));
cbdata.map = ctx->fmap;
reader = xmlReaderForIO(msxml_read_cb, NULL, &cbdata, "hwpml.xml", NULL, CLAMAV_MIN_XMLREADER_FLAGS);
if (!reader) {
cli_dbgmsg("cli_scanhwpml: cannot initialize xmlReader\n");
#if HAVE_JSON
ret = cli_json_parse_error(ctx->wrkproperty, "HWPML_ERROR_XML_READER_IO");
#endif
return ret; // libxml2 failed!
}
memset(&mxctx, 0, sizeof(mxctx));
mxctx.scan_cb = hwpml_binary_cb;
ret = cli_msxml_parse_document(ctx, reader, hwpml_keys, num_hwpml_keys, MSXML_FLAG_JSON, &mxctx);
xmlTextReaderClose(reader);
xmlFreeTextReader(reader);
#else
UNUSEDPARAM(ctx);
cli_dbgmsg("in cli_scanhwpml()\n");
cli_dbgmsg("cli_scanhwpml: scanning hwpml documents requires libxml2!\n");
#endif
return ret;
}
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