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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 "net/http/http_mac_signature.h"
#include "base/base64.h"
#include "base/rand_util.h"
#include "base/string_number_conversions.h"
#include "base/string_util.h"
#include "crypto/hmac.h"
namespace net {
namespace {
const char kSHA1Name[] = "hmac-sha-1";
const char kSHA256Name[] = "hmac-sha-256";
const int kNonceLength = 64/8;
bool IsPlainStringCharacter(char character) {
return character == 0x20 || character == 0x21 ||
(character >= 0x23 && character <= 0x5B) ||
(character >= 0x5D && character <= 0x7E);
}
bool IsPlainString(const std::string& string) {
for (size_t i = 0; i < string.size(); ++i) {
if (!IsPlainStringCharacter(string[i]))
return false;
}
return true;
}
std::string GenerateNonce() {
std::string nonce;
bool result = base::Base64Encode(
base::RandBytesAsString(kNonceLength), &nonce);
DCHECK(result);
return nonce;
}
}
HttpMacSignature::HttpMacSignature()
: mac_algorithm_(crypto::HMAC::SHA1) {
}
HttpMacSignature::~HttpMacSignature() {
}
bool HttpMacSignature::AddStateInfo(const std::string& id,
const base::Time& creation_date,
const std::string& mac_key,
const std::string& mac_algorithm) {
DCHECK(id_.empty());
if (!IsPlainString(id) || id.empty() ||
creation_date.is_null() ||
mac_key.empty() ||
mac_algorithm.empty()) {
return false;
}
if (mac_algorithm == kSHA1Name)
mac_algorithm_ = crypto::HMAC::SHA1;
else if (mac_algorithm == kSHA256Name)
mac_algorithm_ = crypto::HMAC::SHA256;
else
return false;
id_ = id;
creation_date_ = creation_date;
mac_key_ = mac_key;
return true;
}
bool HttpMacSignature::AddHttpInfo(const std::string& method,
const std::string& request_uri,
const std::string& host,
int port) {
DCHECK(method_.empty());
if (!IsPlainString(method) || method.empty() ||
!IsPlainString(request_uri) || request_uri.empty() ||
!IsPlainString(host) || host.empty() ||
port <= 0 || port > 65535) {
return false;
}
method_ = StringToUpperASCII(method);
request_uri_ = request_uri;
host_ = StringToLowerASCII(host);
port_ = base::IntToString(port);
return true;
}
std::string HttpMacSignature::GenerateAuthorizationHeader() {
DCHECK(!id_.empty()) << "Call AddStateInfo first.";
DCHECK(!method_.empty()) << "Call AddHttpInfo first.";
std::string age = base::Int64ToString(
(base::Time::Now() - creation_date_).InSeconds());
std::string nonce = GenerateNonce();
return GenerateHeaderString(age, nonce);
}
std::string HttpMacSignature::GenerateHeaderString(const std::string& age,
const std::string& nonce) {
std::string mac = GenerateMAC(age, nonce);
DCHECK(IsPlainString(age));
DCHECK(IsPlainString(nonce));
DCHECK(IsPlainString(mac));
return "MAC id=\"" + id_ +
"\", nonce=\"" + age + ":" + nonce +
"\", mac=\"" + mac + "\"";
}
std::string HttpMacSignature::GenerateNormalizedRequest(
const std::string& age,
const std::string& nonce) {
static const std::string kNewLine = "\n";
std::string normalized_request = age + ":" + nonce + kNewLine;
normalized_request += method_ + kNewLine;
normalized_request += request_uri_ + kNewLine;
normalized_request += host_ + kNewLine;
normalized_request += port_ + kNewLine;
normalized_request += kNewLine;
normalized_request += kNewLine;
return normalized_request;
}
std::string HttpMacSignature::GenerateMAC(const std::string& age,
const std::string& nonce) {
std::string request = GenerateNormalizedRequest(age, nonce);
crypto::HMAC hmac(mac_algorithm_);
hmac.Init(mac_key_);
std::string signature;
size_t length = hmac.DigestLength();
char* buffer = WriteInto(&signature, length);
bool result = hmac.Sign(request,
reinterpret_cast<unsigned char*>(buffer),
length);
DCHECK(result);
std::string encoded_signature;
result = base::Base64Encode(signature, &encoded_signature);
DCHECK(result);
return encoded_signature;
}
} // namespace net
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