/**
* \brief Loads and parses an URLPolicy file
*
* Can only be called from within SecurityManager
* Waits for mutex at start and releases mutex when finished
* \see SecurityManager::loadURLPolicyFile()
*/
void URLPolicyFile::load()
{
//TODO: support download timeout handling
//Invalid URLPolicyFile or already loaded, ignore this call
if(!isValid() || isLoaded())
return;
//We only try loading once, if something goes wrong, valid will be set to 'invalid'
loaded = true;
URLPolicyFile* master = getMasterPolicyFile();
Mutex::Lock l(mutex);
//Check if this file is allowed/ignored by the master policy file
if(!isMaster())
{
//Load master policy file if not loaded yet
getSys()->securityManager->loadPolicyFile(master);
//Master policy file found and valid and has a site-control entry
if(master->isValid() && master->getSiteControl() != NULL)
{
PolicySiteControl::METAPOLICY permittedPolicies = master->getSiteControl()->getPermittedPolicies();
//For all types: master-only, none
if(permittedPolicies == PolicySiteControl::MASTER_ONLY || permittedPolicies == PolicySiteControl::NONE)
ignore = true;
//Only for FTP: by-ftp-filename
else if(subtype == FTP && permittedPolicies == PolicySiteControl::BY_FTP_FILENAME &&
url.getPathFile() != "crossdomain.xml")
ignore = true;
}
}
//No caching needed for this download, we don't expect very big files
Downloader* downloader=getSys()->downloadManager->download(url, false, NULL);
//Wait until the file is fetched
downloader->waitForTermination();
if(downloader->hasFailed())
valid = false;
//If files are redirected, we use the new URL as the file's URL
if(isValid() && downloader->isRedirected())
{
URLInfo newURL(downloader->getURL());
if(url.getHostname() != newURL.getHostname())
{
LOG(LOG_INFO, _("SECURITY: Policy file was redirected to other domain, marking invalid"));
valid = false;
}
url = newURL;
LOG(LOG_INFO, _("SECURITY: Policy file was redirected"));
}
//Policy files must have on of the following content-types to be valid:
//text/*, application/xml or application/xhtml+xml
tiny_string contentType = downloader->getHeader("content-type");
if(isValid() && (subtype == HTTP || subtype == HTTPS) &&
contentType.substr(0, 5) != "text/" &&
contentType != "application/xml" &&
contentType != "application/xhtml+xml")
{
LOG(LOG_INFO, _("SECURITY: Policy file has an invalid content-type, marking invalid"));
valid = false;
}
//One more check from the master file: see if the content-type is OK
//if site-control specifies by-content-type
if(isValid() && !isMaster())
{
//If the site-control policy of the master policy file is by-content-type, only policy files with
//content-type = text/x-cross-domain-policy are allowed.
if(master->isValid() && master->getSiteControl() != NULL &&
(subtype == HTTP || subtype == HTTPS) &&
master->getSiteControl()->getPermittedPolicies() == PolicySiteControl::BY_CONTENT_TYPE &&
contentType != "text/x-cross-domain-policy")
{
LOG(LOG_INFO, _("SECURITY: Policy file content-type isn't strict, marking invalid"));
ignore = true;
}
}
//We've checked the master file to see of we need to ignore this file. (not the case)
//Now let's parse this file. A HTTP 404 results in a failed download.
if(isValid() && !isIgnored())
{
istream s(downloader);
size_t bufLength = downloader->getLength();
uint8_t* buf=new uint8_t[bufLength];
//TODO: avoid this useless copy
s.read((char*)buf,bufLength);
//We're done with the downloader, lets destroy ASAP
getSys()->downloadManager->destroy(downloader);
CrossDomainPolicy::POLICYFILESUBTYPE parserSubtype = CrossDomainPolicy::NONE;
if(subtype == HTTP)
parserSubtype = CrossDomainPolicy::HTTP;
else if(subtype == HTTPS)
parserSubtype = CrossDomainPolicy::HTTPS;
else if(subtype == FTP)
parserSubtype = CrossDomainPolicy::FTP;
CrossDomainPolicy parser(buf, bufLength, CrossDomainPolicy::URL, parserSubtype, isMaster());
CrossDomainPolicy::ELEMENT elementType = parser.getNextElement();
while(elementType != CrossDomainPolicy::END && elementType != CrossDomainPolicy::INVALID)
{
if(elementType == CrossDomainPolicy::SITE_CONTROL)
{
siteControl = new PolicySiteControl(this, parser.getPermittedPolicies());
//No more parsing is needed if this site-control entry specifies that
//no policy files are allowed
if(isMaster() &&
siteControl->getPermittedPolicies() == PolicySiteControl::NONE)
break;
}
else if(elementType == CrossDomainPolicy::ALLOW_ACCESS_FROM)
//URL policy files don't use to-ports
allowAccessFrom.push_back(new PolicyAllowAccessFrom(this,
parser.getDomain(), "", parser.getSecure(), parser.getSecureSpecified()));
else if(elementType == CrossDomainPolicy::ALLOW_HTTP_REQUEST_HEADERS_FROM)
allowHTTPRequestHeadersFrom.push_back(new PolicyAllowHTTPRequestHeadersFrom(this,
parser.getDomain(), parser.getHeaders(),
parser.getSecure(), parser.getSecureSpecified()));
elementType = parser.getNextElement();
}
delete[] buf;
//The last element was INVALID
if(elementType == CrossDomainPolicy::INVALID)
valid = false;
if(isMaster())
{
//Set siteControl to the default value if it isn't set before and we are a master file
if(siteControl == NULL)
siteControl = new PolicySiteControl(this, "");
//Ignore this file if the site control policy is "none"
if(siteControl->getPermittedPolicies() == PolicySiteControl::NONE)
ignore = true;
//by-ftp-filename only applies to FTP
if((subtype == HTTP || subtype == HTTPS) &&
siteControl->getPermittedPolicies() == PolicySiteControl::BY_FTP_FILENAME)
valid = false;
//by-content-type only applies to HTTP(S)
else if(subtype == FTP &&
siteControl->getPermittedPolicies() == PolicySiteControl::BY_CONTENT_TYPE)
valid = false;
}
}
else
{
//Failed to download the file, marking this file as invalid
valid = false;
getSys()->downloadManager->destroy(downloader);
}
}
/**
* \brief Search for URL policy files relevant to a given URL
*
* Searches the loaded URL policy file list for URL policy files that are relevant to a given URL.
* If \c loadPendingPolicies is true, it search the pending URL policy files list next,
* loading every relative policy file.
* Waits for mutex at start and releases mutex when finished
* \param url The URL that will be evaluated using the relevant policy files.
* \param loadPendingPolicies Whether or not to load (and thus check) pending URL policy files.
* \return An pointer to a newly created URLPFileList containing the relevant policy files.
* This list needs to be deleted after use.
*/
URLPFileList* SecurityManager::searchURLPolicyFiles(const URLInfo& url, bool loadPendingPolicies)
{
URLPFileList* result = new URLPFileList;
//Get or create the master policy file object
URLInfo masterURL = url.goToURL("/crossdomain.xml");
URLPolicyFile* master = getURLPolicyFileByURL(masterURL);
if(master == NULL)
master = addURLPolicyFile(masterURL);
if(loadPendingPolicies)
getSys()->securityManager->loadPolicyFile(master);
RecMutex::Lock l(mutex);
//Check if the master policy file is loaded.
//If another user-added relevant policy file is already loaded,
//it's master will have already been loaded too (to check if it is allowed).
//So IF any relevant policy file is loaded already, then the master will be too.
if(master->isLoaded() && master->isValid())
{
LOG(LOG_INFO, _("SECURITY: Master policy file is loaded and valid (") << url << ")");
PolicySiteControl::METAPOLICY siteControl = master->getSiteControl()->getPermittedPolicies();
//Master defines no policy files are allowed at all
if(siteControl == PolicySiteControl::NONE)
{
LOG(LOG_INFO, _("SECURITY: DISALLOWED: Master policy file disallows policy files"));
return NULL;
}
result->push_back(master);
//Non-master policy files are allowed
if(siteControl != PolicySiteControl::MASTER_ONLY)
{
LOG(LOG_INFO, _("SECURITY: Searching for loaded non-master policy files (") <<
loadedURLPFiles.count(url.getHostname()) << ")");
URLPFileMapConstItPair range = loadedURLPFiles.equal_range(url.getHostname());
URLPFileMapConstIt i = range.first;
for(;i != range.second; ++i)
{
if((*i).second == master)
continue;
result->push_back((*i).second);
}
//And check the pending policy files next (if we are allowed to)
if(loadPendingPolicies)
{
LOG(LOG_INFO, _("SECURITY: Searching for and loading pending non-master policy files (") <<
pendingURLPFiles.count(url.getHostname()) << ")");
while(true)
{
i=pendingURLPFiles.find(url.getHostname());
if(i==pendingURLPFiles.end())
break;
result->push_back((*i).second);
l.release();
getSys()->securityManager->loadPolicyFile((*i).second);
//NOTE: loadPolicyFile() will change pendingURLPFiles,
//erasing & moving to loadURLPFiles. Therefore, the
//iterator i is now invalid.
l.acquire();
}
}
}
}
return result;
}