/**
* \brief Checks if the entry allows a given request header from a given URL
*
* \param url The URL to check this entry against
* \param header The header to check this entry against
* \return \c true if this entry allows the given URL to send the given request header, otherwise \c false
*/
bool PolicyAllowHTTPRequestHeadersFrom::allowsHTTPRequestHeaderFrom(const URLInfo& url,
const string& header) const
{
if(file->getSubtype() != URLPolicyFile::HTTP && file->getSubtype() != URLPolicyFile::HTTPS)
return false;
//Check if domains match
if(!URLInfo::matchesDomain(domain, url.getHostname()))
return false;
//Check if the requesting URL is secure, if needed
if(file->getSubtype() == URLPolicyFile::HTTPS && secure && url.getProtocol() != "https")
return false;
//Check if the header is explicitly allowed
bool headerFound = false;
string expression;
for(list<string*>::const_iterator i = headers.begin();
i != headers.end(); ++i)
{
expression = (**i);
transform(expression.begin(), expression.end(), expression.begin(), ::tolower);
if(expression == header || expression == "*")
{
headerFound = true;
break;
}
//Match suffix wildcards
else if(expression[expression.length()-1] == '*' &&
header.substr(0, expression.length()-1) == expression.substr(0, expression.length()-1))
{
headerFound = true;
break;
}
}
if(!headerFound)
return false;
return true;
}
/**
* \brief Checks if the port in the given URL isn't restricted, depending on the protocol of the URL
*
* \param url The URL to evaluate
* \return \c ALLOWED if allowed or otherwise \c NA_PORT
*/
SecurityManager::EVALUATIONRESULT SecurityManager::evaluatePortURL(const URLInfo& url)
{
if(url.getProtocol() == "http" || url.getProtocol() == "https")
if(url.getPort() == 20 || url.getPort() == 21)
return NA_PORT;
if(url.getProtocol() == "http" || url.getProtocol() == "https" || url.getProtocol() == "ftp")
{
switch(url.getPort())
{
case 1: case 7: case 9: case 11: case 13: case 15: case 17: case 19: case 22: case 23:
case 25: case 37: case 42: case 43: case 53: case 77: case 79: case 87: case 95: case 101:
case 102: case 103: case 104: case 109: case 110: case 111: case 113: case 115: case 117:
case 119: case 123: case 135: case 139: case 143: case 179: case 389: case 465: case 512:
case 513: case 514: case 515: case 526: case 530: case 531: case 532: case 540: case 556:
case 563: case 587: case 601: case 636: case 993: case 995: case 2049: case 4045: case 6000:
return NA_PORT;
}
}
return ALLOWED;
}
/**
* \brief Checks whether this policy file allows the given URL access
*
* \param url The URL to check if it is allowed by the policy file
* \param to The URL that is being requested by a resource at \c url
* \return \c true if allowed, otherwise \c false
*/
bool URLPolicyFile::allowsAccessFrom(const URLInfo& url, const URLInfo& to)
{
//File must be loaded
if(!isLoaded())
return false;
//This policy file doesn't apply to the given URL
if(!isMaster() && !to.isSubOf(url))
return false;
//Check if the file is invalid or ignored
if(!isValid() || isIgnored())
return false;
list<PolicyAllowAccessFrom*>::const_iterator i = allowAccessFrom.begin();
for(; i != allowAccessFrom.end(); ++i)
{
//This allow-access-from entry applies to our domain AND it allows our domain
if((*i)->allowsAccessFrom(url))
return true;
}
return false;
}
/**
* \brief Checks URL policy files to see if the player is allowed to send a given request header
* as part of a request for the given URL
*
* Waits for mutex at start and releases mutex when finished
* \param url The URL of the request to which the request header belongs
* \param header The request header to evaluate
* \param loadPendingPolicies Whether or not to load (and thus check) pending policy files
* \return \c ALLOWED if allowed or otherwise \c NA_HEADER
*/
SecurityManager::EVALUATIONRESULT SecurityManager::evaluateHeader(const URLInfo& url,
const tiny_string& header, bool loadPendingPolicies)
{
//This check doesn't apply to local files
if(url.getProtocol() == "file" && getSys()->getOrigin().getProtocol() == "file")
return ALLOWED;
LOG(LOG_INFO, _("SECURITY: Evaluating header for cross domain policies ('") << header << "'):");
LOG(LOG_INFO, _("SECURITY: --> URL: ") << url);
LOG(LOG_INFO, _("SECURITY: --> Origin: ") << getSys()->getOrigin());
string headerStrLower(header.raw_buf());
transform(headerStrLower.begin(), headerStrLower.end(), headerStrLower.begin(), ::tolower);
string headerStr = headerStrLower;
if(headerStr.find("_") != string::npos)
headerStr.replace(headerStr.find("_"), 1, "-");
//Disallowed headers, in any case
if(headerStr == "accept-charset" && headerStr == "accept-encoding" && headerStr == "accept-ranges" &&
headerStr == "age" && headerStr == "allow" && headerStr == "allowed" && headerStr == "authorization" &&
headerStr == "charge-to" && headerStr == "connect" && headerStr == "connection" &&
headerStr == "content-length" && headerStr == "content-location" && headerStr == "content-range" &&
headerStr == "cookie" && headerStr == "date" && headerStr == "delete" && headerStr == "etag" &&
headerStr == "expect" && headerStr == "get" && headerStr == "head" && headerStr == "host" &&
headerStr == "if-modified-since" && headerStr == "keep-alive" && headerStr == "last-modified" &&
headerStr == "location" && headerStr == "max-forwards" && headerStr == "options" &&
headerStr == "origin" && headerStr == "post" && headerStr == "proxy-authenticate" &&
headerStr == "proxy-authorization" && headerStr == "proxy-connection" && headerStr == "public" &&
headerStr == "put" && headerStr == "range" && headerStr == "referer" && headerStr == "request-range" &&
headerStr == "retry-after" && headerStr == "server" && headerStr == "te" && headerStr == "trace" &&
headerStr == "trailer" && headerStr == "transfer-encoding" && headerStr == "upgrade" &&
headerStr == "uri" && headerStr == "user-agent" && headerStr == "vary" && headerStr == "via" &&
headerStr == "warning" && headerStr == "www-authenticate" && headerStr == "x-flash-version")
{
LOG(LOG_INFO, _("SECURITY: DISALLOWED: Header is restricted"));
return NA_HEADER;
}
//The URL has exactly the same domain name as the origin, always allowed
if(url.getProtocol() == getSys()->getOrigin().getProtocol() &&
url.getHostname() == getSys()->getOrigin().getHostname())
{
LOG(LOG_INFO, _("SECURITY: ALLOWED: Same hostname as origin"));
return ALLOWED;
}
//Search for the policy files to check
URLPFileList* files = searchURLPolicyFiles(url, loadPendingPolicies);
RecMutex::Lock l(mutex);
//Check the policy files
if(files != NULL)
{
URLPFileListConstIt it = files->begin();
for(; it != files->end(); ++it)
{
if((*it)->allowsHTTPRequestHeaderFrom(getSys()->getOrigin(), url, headerStrLower))
{
LOG(LOG_INFO, _("SECURITY: ALLOWED: A policy file explicitly allowed the header"));
delete files;
return ALLOWED;
}
}
}
LOG(LOG_INFO, _("SECURITY: DISALLOWED: No policy file explicitly allowed the header"));
delete files;
return NA_CROSSDOMAIN_POLICY;
}