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// Copyright (c) 2011 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 "remoting/host/support_access_verifier.h"
#include <stdlib.h>
#include "base/logging.h"
#include "base/rand_util.h"
#include "base/string_util.h"
#include "remoting/host/host_config.h"
#include "remoting/protocol/auth_token_utils.h"
namespace remoting {
namespace {
// 5 characters long from 34-letter alphabet gives 4.5M possible
// access codes with uniform distribution, which should be enough
// for short-term passwords.
const int kAccessCodeLength = 5;
// The following set includes 10 digits and Latin alphabet except I
// and O. I and O are not used to avoid confusion with 1 and 0.
const char kAccessCodeAlphabet[] = "ABCDEFGHJKLMNPQRSTUVWXYZ0123456789";
// Generates cryptographically strong random number in the range [0, max).
int CryptoRandomInt(int max) {
uint32 random_int32;
base::RandBytes(&random_int32, sizeof(random_int32));
return random_int32 % max;
}
std::string GenerateRandomAccessCode() {
std::vector<char> result;
int alphabet_size = strlen(kAccessCodeAlphabet);
result.resize(kAccessCodeLength);
for (int i = 0; i < kAccessCodeLength; ++i) {
result[i] = kAccessCodeAlphabet[CryptoRandomInt(alphabet_size)];
}
return std::string(result.begin(), result.end());
}
} // namespace
SupportAccessVerifier::SupportAccessVerifier()
: initialized_(false) {
}
SupportAccessVerifier::~SupportAccessVerifier() { }
bool SupportAccessVerifier::Init() {
access_code_ = GenerateRandomAccessCode();
initialized_ = true;
return true;
}
bool SupportAccessVerifier::VerifyPermissions(
const std::string& client_jid,
const std::string& encoded_access_token) {
CHECK(initialized_);
return protocol::VerifySupportAuthToken(
client_jid, access_code_, encoded_access_token);
}
} // namespace remoting
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