// Test whether or not a particular request's incoming/outgoing data should be scanned.
// This is an early-stage (request headers only) test; no other info is known about
// the actual data itself when this is called.
int CSPlugin::willScanRequest(const String &url, const char *user, int filtergroup,
const char *ip, bool post, bool reconstituted, bool exception, bool bypass)
{
// Most content scanners only deal with original, unmodified content
if (reconstituted) {
#ifdef DGDEBUG
std::cout << "willScanRequest: ignoring reconstituted data" << std::endl;
#endif
return DGCS_NOSCAN;
}
// Deal with POST file uploads conditionally, but subject only to the "scanpost"
// option, not to the domain & URL lists - uploading files does not have the same
// implications as downlaoding them.
if (post) {
if (scanpost) {
#ifdef DGDEBUG
std::cout << "willScanRequest: I'm interested in uploads" << std::endl;
#endif
return DGCS_NEEDSCAN;
} else {
#ifdef DGDEBUG
std::cout << "willScanRequest: Not interested in uploads" << std::endl;
#endif
return DGCS_NOSCAN;
}
}
String urld(HTTPHeader::decode(url));
urld.removeWhiteSpace();
urld.toLower();
urld.removePTP();
String domain, tempurl, foundurl, path;
unsigned int fl;
if (urld.contains("/")) {
domain = urld.before("/");
path = "/" + urld.after("/");
path.hexDecode();
path.realPath();
} else {
domain = urld;
}
// Don't scan the web server which hosts the access denied page
if (((o.fg[filtergroup]->reporting_level == 1) || (o.fg[filtergroup]->reporting_level == 2))
&& domain.startsWith(o.fg[filtergroup]->access_denied_domain)) {
#ifdef DGDEBUG
std::cout << "willScanRequest: ignoring our own webserver" << std::endl;
#endif
return DGCS_NOSCAN;
}
// exceptionvirussitelist
tempurl = domain;
while (tempurl.contains(".")) {
if (exceptionvirussitelist.findInList(tempurl.toCharArray()) != NULL) {
#ifdef DGDEBUG
std::cout << "willScanRequest: ignoring exception virus site" << std::endl;
#endif
return DGCS_NOSCAN; // exact match
}
tempurl = tempurl.after("."); // check for being in higher level domains
}
if (tempurl.length() > 1) {
// allows matching of .tld
tempurl = "." + tempurl;
if (exceptionvirussitelist.findInList(tempurl.toCharArray()) != NULL) {
#ifdef DGDEBUG
std::cout << "willScanRequest: ignoring exception virus site" << std::endl;
#endif
return DGCS_NOSCAN; // exact match
}
}
// exceptionvirusurllist
tempurl = domain + path;
if (tempurl.endsWith("/")) {
tempurl.chop(); // chop off trailing / if any
}
while (tempurl.before("/").contains(".")) {
char *i = exceptionvirusurllist.findStartsWith(tempurl.toCharArray());
if (i != NULL) {
foundurl = i;
fl = foundurl.length();
if (tempurl.length() > fl) {
unsigned char c = tempurl[fl];
if (c == '/' || c == '?' || c == '&' || c == '=') {
#ifdef DGDEBUG
std::cout << "willScanRequest: ignoring exception virus URL" << std::endl;
#endif
return DGCS_NOSCAN; // matches /blah/ or /blah/foo but not /blahfoo
}
} else {
#ifdef DGDEBUG
std::cout << "willScanRequest: ignoring exception virus URL" << std::endl;
#endif
return DGCS_NOSCAN; // exact match
}
}
tempurl = tempurl.after("."); // check for being in higher level domains
}
#ifdef DGDEBUG
std::cout << "willScanRequest: I'm interested" << std::endl;
#endif
return DGCS_NEEDSCAN;
}
// Test whether or not a particular request's incoming/outgoing data should be scanned.
// This is a later-stage test; info is known about the actual data itself when this is called.
int CSPlugin::willScanData(const String &url, const char *user, int filtergroup, const char *ip, bool post,
bool reconstituted, bool exception, bool bypass, const String &disposition, const String &mimetype,
off_t size)
{
//exceptionvirusmimetypelist
if (mimetype.length() > 2) {
if (exceptionvirusmimetypelist.findInList(mimetype.toCharArray()) != NULL) {
#ifdef DGDEBUG
std::cout << "willScanData: ignoring exception MIME type (" << mimetype.c_str() << ")" << std::endl;
#endif
return DGCS_NOSCAN; // match
}
}
//exceptionvirusextensionlist
String extension;
if (disposition.length() > 2) {
// If we have a content-disposition, determine file extension from that
#ifdef DGDEBUG
std::cout << "disposition: " << disposition << std::endl;
#endif
std::string::size_type start = disposition.find("filename=");
if (start != std::string::npos) {
start += 9;
char endchar = ';';
if (disposition[start] == '"') {
endchar = '"';
++start;
}
std::string::size_type end = disposition.find(endchar, start);
if (end != std::string::npos)
extension = disposition.substr(start, end - start);
else
extension = disposition.substr(start);
}
while (extension.contains(".")) {
extension = extension.after(".");
}
extension = "." + extension;
#ifdef DGDEBUG
std::cout << "extension from disposition: " << extension << std::endl;
#endif
} else {
// Otherwise, determine it from the URL
String urld(HTTPHeader::decode(url)), path;
urld.removeWhiteSpace();
urld.toLower();
urld.removePTP();
if (urld.contains("/")) {
path = urld.after("/");
path.hexDecode();
path.realPath();
}
if (!path.contains("?")) {
extension = path;
} else if (mimetype.contains("application/")) {
extension = path;
if (extension.contains("?")) {
extension = extension.before("?");
}
}
#ifdef DGDEBUG
std::cout << "extension from URL: " << extension << std::endl;
#endif
}
if (extension.contains(".")) {
if (exceptionvirusextensionlist.findEndsWith(extension.toCharArray()) != NULL) {
#ifdef DGDEBUG
std::cout << "willScanData: ignoring exception file extension (" << extension.c_str() << ")" << std::endl;
#endif
return DGCS_NOSCAN; // match
}
}
#ifdef DGDEBUG
std::cout << "willScanData: I'm interested" << std::endl;
#endif
return DGCS_NEEDSCAN;
}
// test whether or not a request should be scanned based on sent & received headers
int CSPlugin::scanTest(HTTPHeader * requestheader, HTTPHeader * docheader, const char *user, int filtergroup, const char *ip)
{
char *i;
//exceptionvirusmimetypelist
String mimetype(docheader->getContentType());
#ifdef DGDEBUG
std::cout<<"mimetype: "<<mimetype<<std::endl;
#endif
i = exceptionvirusmimetypelist.findInList(mimetype.toCharArray());
if (i != NULL) {
return DGCS_NOSCAN; // match
}
String disposition(docheader->disposition());
#ifdef DGDEBUG
std::cout<<"disposition: "<<disposition<<std::endl;
#endif
String url(requestheader->url());
String urld(requestheader->decode(url));
urld.removeWhiteSpace();
urld.toLower();
urld.removePTP();
String domain, tempurl, foundurl, path, extension;
unsigned int fl;
if (urld.contains("/")) {
domain = urld.before("/");
path = "/" + urld.after("/");
path.hexDecode();
path.realPath();
} else {
domain = urld;
}
// don't scan our web server
if (((o.fg[filtergroup]->reporting_level == 1) || (o.fg[filtergroup]->reporting_level == 2)) && domain.startsWith(o.fg[filtergroup]->access_denied_domain)) {
return DGCS_NOSCAN;
}
//exceptionvirusextensionlist
if (disposition.length() > 2) {
extension = disposition;
while (extension.contains(".")) {
extension = extension.after(".");
}
extension = "." + extension;
} else {
if (!path.contains("?")) {
extension = path;
}
else if (mimetype.contains("application/")) {
extension = path;
if (extension.contains("?")) {
extension = extension.before("?");
}
}
}
#ifdef DGDEBUG
std::cout<<"extension: "<<extension<<std::endl;
#endif
if (extension.contains(".")) {
i = exceptionvirusextensionlist.findEndsWith(extension.toCharArray());
if (i != NULL) {
return DGCS_NOSCAN; // match
}
}
// exceptionvirussitelist
tempurl = domain;
#ifdef DGDEBUG
std::cout<<"domain: "<<domain<<std::endl;
#endif
while (tempurl.contains(".")) {
i = exceptionvirussitelist.findInList(tempurl.toCharArray());
if (i != NULL) {
return DGCS_NOSCAN; // exact match
}
tempurl = tempurl.after("."); // check for being in higher level domains
}
if (tempurl.length() > 1) { // allows matching of .tld
tempurl = "." + tempurl;
i = exceptionvirussitelist.findInList(tempurl.toCharArray());
if (i != NULL) {
return DGCS_NOSCAN; // exact match
}
}
// exceptionvirusurllist
tempurl = domain + path;
if (tempurl.endsWith("/")) {
tempurl.chop(); // chop off trailing / if any
}
while (tempurl.before("/").contains(".")) {
i = exceptionvirusurllist.findStartsWith(tempurl.toCharArray());
if (i != NULL) {
foundurl = i;
fl = foundurl.length();
if (tempurl.length() > fl) {
unsigned char c = tempurl[fl];
if (c == '/' || c == '?' || c == '&' || c == '=') {
return DGCS_NOSCAN; // matches /blah/ or /blah/foo but not /blahfoo
}
} else {
return DGCS_NOSCAN; // exact match
}
}
tempurl = tempurl.after("."); // check for being in higher level domains
}
#ifdef DGDEBUG
std::cout << "URL " << url << " is going to need AV scanning." << std::endl;
#endif
return DGCS_NEEDSCAN;
}
