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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/force_tls_state.h"
#include "base/json_reader.h"
#include "base/json_writer.h"
#include "base/logging.h"
#include "base/scoped_ptr.h"
#include "base/string_tokenizer.h"
#include "base/string_util.h"
#include "base/values.h"
#include "googleurl/src/gurl.h"
#include "net/base/registry_controlled_domain.h"
namespace net {
ForceTLSState::ForceTLSState()
: delegate_(NULL) {
}
void ForceTLSState::DidReceiveHeader(const GURL& url,
const std::string& value) {
int max_age;
bool include_subdomains;
if (!ParseHeader(value, &max_age, &include_subdomains))
return;
base::Time current_time(base::Time::Now());
base::TimeDelta max_age_delta = base::TimeDelta::FromSeconds(max_age);
base::Time expiry = current_time + max_age_delta;
EnableHost(url.host(), expiry, include_subdomains);
}
void ForceTLSState::EnableHost(const std::string& host, base::Time expiry,
bool include_subdomains) {
// TODO(abarth): Canonicalize host.
AutoLock lock(lock_);
State state = {expiry, include_subdomains};
enabled_hosts_[host] = state;
DirtyNotify();
}
bool ForceTLSState::IsEnabledForHost(const std::string& host) {
// TODO(abarth): Canonicalize host.
// TODO: check for subdomains too.
AutoLock lock(lock_);
std::map<std::string, State>::iterator i = enabled_hosts_.find(host);
if (i == enabled_hosts_.end())
return false;
base::Time current_time(base::Time::Now());
if (current_time > i->second.expiry) {
enabled_hosts_.erase(i);
DirtyNotify();
return false;
}
return true;
}
// "X-Force-TLS" ":" "max-age" "=" delta-seconds *1INCLUDESUBDOMAINS
// INCLUDESUBDOMAINS = [ " includeSubDomains" ]
bool ForceTLSState::ParseHeader(const std::string& value,
int* max_age,
bool* include_subdomains) {
DCHECK(max_age);
DCHECK(include_subdomains);
int max_age_candidate;
enum ParserState {
START,
AFTER_MAX_AGE_LABEL,
AFTER_MAX_AGE_EQUALS,
AFTER_MAX_AGE,
AFTER_MAX_AGE_INCLUDE_SUB_DOMAINS_DELIMITER,
AFTER_INCLUDE_SUBDOMAINS,
} state = START;
StringTokenizer tokenizer(value, " =");
tokenizer.set_options(StringTokenizer::RETURN_DELIMS);
while (tokenizer.GetNext()) {
DCHECK(!tokenizer.token_is_delim() || tokenizer.token().length() == 1);
DCHECK(tokenizer.token_is_delim() || *tokenizer.token_begin() != ' ');
switch (state) {
case START:
if (*tokenizer.token_begin() == ' ')
continue;
if (!LowerCaseEqualsASCII(tokenizer.token(), "max-age"))
return false;
state = AFTER_MAX_AGE_LABEL;
break;
case AFTER_MAX_AGE_LABEL:
if (*tokenizer.token_begin() == ' ')
continue;
if (*tokenizer.token_begin() != '=')
return false;
DCHECK(tokenizer.token().length() == 1);
state = AFTER_MAX_AGE_EQUALS;
break;
case AFTER_MAX_AGE_EQUALS:
if (*tokenizer.token_begin() == ' ')
continue;
if (!StringToInt(tokenizer.token(), &max_age_candidate))
return false;
if (max_age_candidate < 0)
return false;
state = AFTER_MAX_AGE;
break;
case AFTER_MAX_AGE:
if (*tokenizer.token_begin() != ' ')
return false;
state = AFTER_MAX_AGE_INCLUDE_SUB_DOMAINS_DELIMITER;
break;
case AFTER_MAX_AGE_INCLUDE_SUB_DOMAINS_DELIMITER:
if (*tokenizer.token_begin() == ' ')
continue;
if (!LowerCaseEqualsASCII(tokenizer.token(), "includesubdomains"))
return false;
state = AFTER_INCLUDE_SUBDOMAINS;
break;
case AFTER_INCLUDE_SUBDOMAINS:
if (*tokenizer.token_begin() != ' ')
return false;
break;
default:
NOTREACHED();
}
}
// We've consumed all the input. Let's see what state we ended up in.
switch (state) {
case START:
case AFTER_MAX_AGE_LABEL:
case AFTER_MAX_AGE_EQUALS:
return false;
case AFTER_MAX_AGE:
case AFTER_MAX_AGE_INCLUDE_SUB_DOMAINS_DELIMITER:
*max_age = max_age_candidate;
*include_subdomains = false;
return true;
case AFTER_INCLUDE_SUBDOMAINS:
*max_age = max_age_candidate;
*include_subdomains = true;
return true;
default:
NOTREACHED();
return false;
}
}
void ForceTLSState::SetDelegate(ForceTLSState::Delegate* delegate) {
AutoLock lock(lock_);
delegate_ = delegate;
}
bool ForceTLSState::Serialise(std::string* output) {
AutoLock lock(lock_);
DictionaryValue toplevel;
for (std::map<std::string, State>::const_iterator
i = enabled_hosts_.begin(); i != enabled_hosts_.end(); ++i) {
DictionaryValue* state = new DictionaryValue;
state->SetBoolean(L"include_subdomains", i->second.include_subdomains);
state->SetReal(L"expiry", i->second.expiry.ToDoubleT());
toplevel.Set(ASCIIToWide(i->first), state);
}
JSONWriter::Write(&toplevel, true /* pretty print */, output);
return true;
}
bool ForceTLSState::Deserialise(const std::string& input) {
AutoLock lock(lock_);
enabled_hosts_.clear();
scoped_ptr<Value> value(
JSONReader::Read(input, false /* do not allow trailing commas */));
if (!value.get() || !value->IsType(Value::TYPE_DICTIONARY))
return false;
DictionaryValue* dict_value = reinterpret_cast<DictionaryValue*>(value.get());
const base::Time current_time(base::Time::Now());
for (DictionaryValue::key_iterator
i = dict_value->begin_keys(); i != dict_value->end_keys(); ++i) {
DictionaryValue* state;
if (!dict_value->GetDictionary(*i, &state))
continue;
const std::string host = WideToASCII(*i);
bool include_subdomains;
double expiry;
if (!state->GetBoolean(L"include_subdomains", &include_subdomains) ||
!state->GetReal(L"expiry", &expiry)) {
continue;
}
base::Time expiry_time = base::Time::FromDoubleT(expiry);
if (expiry_time <= current_time)
continue;
State new_state = { expiry_time, include_subdomains };
enabled_hosts_[host] = new_state;
}
return enabled_hosts_.size() > 0;
}
void ForceTLSState::DirtyNotify() {
if (delegate_)
delegate_->StateIsDirty(this);
}
} // namespace
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