static int ooxml_extn_cb(int fd, cli_ctx *ctx)
{
int ret;
cli_dbgmsg("in ooxml_extn_cb\n");
ret = ooxml_parse_document(fd, ctx);
if (ret == CL_EPARSE)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_EXTN_XMLPARSER");
else if (ret == CL_EFORMAT)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_EXTN_MALFORMED");
return ret;
}
int cli_process_ooxml(cli_ctx *ctx)
{
#if HAVE_LIBXML2 && HAVE_JSON
uint32_t loff = 0;
int tmp = CL_SUCCESS;
cli_dbgmsg("in cli_process_ooxml\n");
if (!ctx) {
return CL_ENULLARG;
}
/* find "[Content Types].xml" */
tmp = unzip_search_single(ctx, "[Content_Types].xml", 18, &loff);
if (tmp == CL_ETIMEOUT) {
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_TIMEOUT");
return CL_ETIMEOUT;
}
else if (tmp != CL_VIRUS) {
cli_dbgmsg("cli_process_ooxml: failed to find ""[Content_Types].xml""!\n");
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_NO_CONTENT_TYPES");
return CL_EFORMAT;
}
cli_dbgmsg("cli_process_ooxml: found ""[Content_Types].xml"" @ %x\n", loff);
tmp = unzip_single_internal(ctx, loff, ooxml_content_cb);
if (tmp == CL_ETIMEOUT)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_TIMEOUT");
else if (tmp == CL_EMEM)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_OUTOFMEM");
else if (tmp == CL_EMAXSIZE)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_EMAXSIZE");
else if (tmp == CL_EMAXFILES)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_EMAXFILES");
return tmp;
#else
UNUSEDPARAM(ctx);
cli_dbgmsg("in cli_process_ooxml\n");
#if !HAVE_LIBXML2
cli_dbgmsg("cli_process_ooxml: libxml2 needs to enabled!\n");
#endif
#if !HAVE_JSON
cli_dbgmsg("cli_process_ooxml: libjson needs to enabled!\n");
#endif
return CL_SUCCESS;
#endif
}
static int ooxml_content_cb(int fd, cli_ctx *ctx)
{
int ret = CL_SUCCESS, tmp, toval = 0, state;
int core=0, extn=0, cust=0, dsig=0;
int mcore=0, mextn=0, mcust=0;
const xmlChar *name, *value, *CT, *PN;
xmlTextReaderPtr reader = NULL;
uint32_t loff;
unsigned long sav_scansize = ctx->scansize;
unsigned int sav_scannedfiles = ctx->scannedfiles;
cli_dbgmsg("in ooxml_content_cb\n");
/* perform engine limit checks in temporary tracking session */
ret = ooxml_updatelimits(fd, ctx);
if (ret != CL_CLEAN)
return ret;
/* apply a reader to the document */
reader = xmlReaderForFd(fd, "[Content_Types].xml", NULL, CLAMAV_MIN_XMLREADER_FLAGS);
if (reader == NULL) {
cli_dbgmsg("ooxml_content_cb: xmlReaderForFd error for ""[Content_Types].xml""\n");
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_XML_READER_FD");
ctx->scansize = sav_scansize;
ctx->scannedfiles = sav_scannedfiles;
return CL_SUCCESS; // libxml2 failed!
}
/* locate core-properties, extended-properties, and custom-properties (optional) */
while ((state = xmlTextReaderRead(reader)) == 1) {
if (cli_json_timeout_cycle_check(ctx, &toval) != CL_SUCCESS) {
ret = CL_ETIMEOUT;
goto ooxml_content_exit;
}
name = xmlTextReaderConstLocalName(reader);
if (name == NULL) continue;
if (strcmp((const char *)name, "Override")) continue;
if (xmlTextReaderHasAttributes(reader) != 1) continue;
CT = PN = NULL;
while (xmlTextReaderMoveToNextAttribute(reader) == 1) {
name = xmlTextReaderConstLocalName(reader);
value = xmlTextReaderConstValue(reader);
if (name == NULL || value == NULL) continue;
if (!xmlStrcmp(name, (const xmlChar *)"ContentType")) {
CT = value;
}
else if (!xmlStrcmp(name, (const xmlChar *)"PartName")) {
PN = value;
}
cli_dbgmsg("%s: %s\n", name, value);
}
if (!CT && !PN) continue;
if (!xmlStrcmp(CT, (const xmlChar *)"application/vnd.openxmlformats-package.core-properties+xml")) {
/* default: /docProps/core.xml*/
tmp = unzip_search_single(ctx, (const char *)(PN+1), xmlStrlen(PN)-1, &loff);
if (tmp == CL_ETIMEOUT) {
ret = tmp;
}
else if (tmp != CL_VIRUS) {
cli_dbgmsg("cli_process_ooxml: failed to find core properties file \"%s\"!\n", PN);
mcore++;
}
else {
cli_dbgmsg("ooxml_content_cb: found core properties file \"%s\" @ %x\n", PN, loff);
if (!core) {
tmp = unzip_single_internal(ctx, loff, ooxml_core_cb);
if (tmp == CL_ETIMEOUT || tmp == CL_EMEM) {
ret = tmp;
}
}
core++;
}
}
else if (!xmlStrcmp(CT, (const xmlChar *)"application/vnd.openxmlformats-officedocument.extended-properties+xml")) {
/* default: /docProps/app.xml */
tmp = unzip_search_single(ctx, (const char *)(PN+1), xmlStrlen(PN)-1, &loff);
if (tmp == CL_ETIMEOUT) {
ret = tmp;
}
else if (tmp != CL_VIRUS) {
cli_dbgmsg("cli_process_ooxml: failed to find extended properties file \"%s\"!\n", PN);
mextn++;
}
else {
cli_dbgmsg("ooxml_content_cb: found extended properties file \"%s\" @ %x\n", PN, loff);
if (!extn) {
tmp = unzip_single_internal(ctx, loff, ooxml_extn_cb);
if (tmp == CL_ETIMEOUT || tmp == CL_EMEM) {
ret = tmp;
}
}
extn++;
}
}
else if (!xmlStrcmp(CT, (const xmlChar *)"application/vnd.openxmlformats-officedocument.custom-properties+xml")) {
/* default: /docProps/custom.xml */
tmp = unzip_search_single(ctx, (const char *)(PN+1), xmlStrlen(PN)-1, &loff);
if (tmp == CL_ETIMEOUT) {
ret = tmp;
}
else if (tmp != CL_VIRUS) {
cli_dbgmsg("cli_process_ooxml: failed to find custom properties file \"%s\"!\n", PN);
mcust++;
}
else {
cli_dbgmsg("ooxml_content_cb: found custom properties file \"%s\" @ %x\n", PN, loff);
/* custom properties are not parsed */
cust++;
}
}
else if (!xmlStrcmp(CT, (const xmlChar *)"application/vnd.openxmlformats-package.digital-signature-xmlsignature+xml")) {
dsig++;
}
if (ret != CL_SUCCESS)
goto ooxml_content_exit;
}
ooxml_content_exit:
if (core) {
cli_jsonint(ctx->wrkproperty, "CorePropertiesFileCount", core);
if (core > 1)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_MULTIPLE_CORE_PROPFILES");
}
else if (!mcore)
cli_dbgmsg("cli_process_ooxml: file does not contain core properties file\n");
if (mcore) {
cli_jsonint(ctx->wrkproperty, "CorePropertiesMissingFileCount", mcore);
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_MISSING_CORE_PROPFILES");
}
if (extn) {
cli_jsonint(ctx->wrkproperty, "ExtendedPropertiesFileCount", extn);
if (extn > 1)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_MULTIPLE_EXTN_PROPFILES");
}
else if (!mextn)
cli_dbgmsg("cli_process_ooxml: file does not contain extended properties file\n");
if (mextn) {
cli_jsonint(ctx->wrkproperty, "ExtendedPropertiesMissingFileCount", mextn);
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_MISSING_EXTN_PROPFILES");
}
if (cust) {
cli_jsonint(ctx->wrkproperty, "CustomPropertiesFileCount", cust);
if (cust > 1)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_MULTIPLE_CUSTOM_PROPFILES");
}
else if (!mcust)
cli_dbgmsg("cli_process_ooxml: file does not contain custom properties file\n");
if (mcust) {
cli_jsonint(ctx->wrkproperty, "CustomPropertiesMissingFileCount", mcust);
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_MISSING_CUST_PROPFILES");
}
if (dsig) {
cli_jsonint(ctx->wrkproperty, "DigitalSignaturesCount", dsig);
}
/* restore the engine tracking limits; resets session limit tracking */
ctx->scansize = sav_scansize;
ctx->scannedfiles = sav_scannedfiles;
xmlTextReaderClose(reader);
xmlFreeTextReader(reader);
return ret;
}
int cli_process_ooxml(cli_ctx *ctx, int type)
{
#if HAVE_LIBXML2 && HAVE_JSON
uint32_t loff = 0;
int ret = CL_SUCCESS;
cli_dbgmsg("in cli_process_ooxml\n");
if (!ctx) {
return CL_ENULLARG;
}
if (type == CL_TYPE_OOXML_HWP) {
/* two files: version.xml and Contents/content.hpf */
ret = unzip_search_single(ctx, "version.xml", 11, &loff);
if (ret == CL_ETIMEOUT) {
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_TIMEOUT");
return CL_ETIMEOUT;
}
else if (ret != CL_VIRUS) {
cli_dbgmsg("cli_process_ooxml: failed to find ""version.xml""!\n");
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_NO_HWP_VERSION");
return CL_EFORMAT;
}
ret = unzip_single_internal(ctx, loff, ooxml_hwp_cb);
if (ret == CL_SUCCESS) {
ret = unzip_search_single(ctx, "Contents/content.hpf", 20, &loff);
if (ret == CL_ETIMEOUT) {
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_TIMEOUT");
return CL_ETIMEOUT;
}
else if (ret != CL_VIRUS) {
cli_dbgmsg("cli_process_ooxml: failed to find ""Contents/content.hpf""!\n");
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_NO_HWP_CONTENT");
return CL_EFORMAT;
}
ret = unzip_single_internal(ctx, loff, ooxml_hwp_cb);
}
} else {
/* find "[Content Types].xml" */
ret = unzip_search_single(ctx, "[Content_Types].xml", 19, &loff);
if (ret == CL_ETIMEOUT) {
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_TIMEOUT");
return CL_ETIMEOUT;
}
else if (ret != CL_VIRUS) {
cli_dbgmsg("cli_process_ooxml: failed to find ""[Content_Types].xml""!\n");
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_NO_CONTENT_TYPES");
return CL_EFORMAT;
}
cli_dbgmsg("cli_process_ooxml: found ""[Content_Types].xml"" @ %x\n", loff);
ret = unzip_single_internal(ctx, loff, ooxml_content_cb);
}
if (ret == CL_ETIMEOUT)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_TIMEOUT");
else if (ret == CL_EMEM)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_OUTOFMEM");
else if (ret == CL_EMAXSIZE)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_EMAXSIZE");
else if (ret == CL_EMAXFILES)
cli_json_parse_error(ctx->wrkproperty, "OOXML_ERROR_EMAXFILES");
return ret;
#else
UNUSEDPARAM(ctx);
cli_dbgmsg("in cli_process_ooxml\n");
#if !HAVE_LIBXML2
cli_dbgmsg("cli_process_ooxml: libxml2 needs to enabled!\n");
#endif
#if !HAVE_JSON
cli_dbgmsg("cli_process_ooxml: libjson needs to enabled!\n");
#endif
return CL_SUCCESS;
#endif
}
