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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/scheme_host_port_matcher_rule.h"
#include "base/strings/pattern.h"
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "net/base/host_port_pair.h"
#include "net/base/parse_number.h"
#include "net/base/url_util.h"
#include "url/url_util.h"
namespace net {
namespace {
std::string AddBracketsIfIPv6(const IPAddress& ip_address) {
std::string ip_host = ip_address.ToString();
if (ip_address.IsIPv6())
return base::StringPrintf("[%s]", ip_host.c_str());
return ip_host;
}
} // namespace
// static
std::unique_ptr<SchemeHostPortMatcherRule>
SchemeHostPortMatcherRule::FromUntrimmedRawString(
base::StringPiece raw_untrimmed) {
base::StringPiece raw =
base::TrimWhitespaceASCII(raw_untrimmed, base::TRIM_ALL);
// Extract any scheme-restriction.
std::string::size_type scheme_pos = raw.find("://");
std::string scheme;
if (scheme_pos != std::string::npos) {
scheme = std::string(raw.substr(0, scheme_pos));
raw = raw.substr(scheme_pos + 3);
if (scheme.empty())
return nullptr;
}
if (raw.empty())
return nullptr;
// If there is a forward slash in the input, it is probably a CIDR style
// mask.
if (raw.find('/') != std::string::npos) {
IPAddress ip_prefix;
size_t prefix_length_in_bits;
if (!ParseCIDRBlock(raw, &ip_prefix, &prefix_length_in_bits))
return nullptr;
return std::make_unique<SchemeHostPortMatcherIPBlockRule>(
std::string(raw), scheme, ip_prefix, prefix_length_in_bits);
}
// Check if we have an <ip-address>[:port] input. We need to treat this
// separately since the IP literal may not be in a canonical form.
std::string host;
int port;
if (ParseHostAndPort(raw, &host, &port)) {
IPAddress ip_address;
if (ip_address.AssignFromIPLiteral(host)) {
// Instead of -1, 0 is invalid for IPEndPoint.
int adjusted_port = port == -1 ? 0 : port;
return std::make_unique<SchemeHostPortMatcherIPHostRule>(
scheme, IPEndPoint(ip_address, adjusted_port));
}
}
// Otherwise assume we have <hostname-pattern>[:port].
std::string::size_type pos_colon = raw.rfind(':');
port = -1;
if (pos_colon != std::string::npos) {
if (!ParseInt32(
base::MakeStringPiece(raw.begin() + pos_colon + 1, raw.end()),
ParseIntFormat::NON_NEGATIVE, &port) ||
port > 0xFFFF) {
return nullptr; // Port was invalid.
}
raw = raw.substr(0, pos_colon);
}
// Special-case hostnames that begin with a period.
// For example, we remap ".google.com" --> "*.google.com".
std::string hostname_pattern;
if (base::StartsWith(raw, ".", base::CompareCase::SENSITIVE)) {
hostname_pattern = base::StrCat({"*", raw});
} else {
hostname_pattern = std::string(raw);
}
return std::make_unique<SchemeHostPortMatcherHostnamePatternRule>(
scheme, hostname_pattern, port);
}
bool SchemeHostPortMatcherRule::IsHostnamePatternRule() const {
return false;
}
SchemeHostPortMatcherHostnamePatternRule::
SchemeHostPortMatcherHostnamePatternRule(
const std::string& optional_scheme,
const std::string& hostname_pattern,
int optional_port)
: optional_scheme_(base::ToLowerASCII(optional_scheme)),
hostname_pattern_(base::ToLowerASCII(hostname_pattern)),
optional_port_(optional_port) {
// |hostname_pattern| shouldn't be an IP address.
DCHECK(!url::HostIsIPAddress(hostname_pattern));
}
SchemeHostPortMatcherResult SchemeHostPortMatcherHostnamePatternRule::Evaluate(
const GURL& url) const {
if (optional_port_ != -1 && url.EffectiveIntPort() != optional_port_) {
// Didn't match port expectation.
return SchemeHostPortMatcherResult::kNoMatch;
}
if (!optional_scheme_.empty() && url.scheme() != optional_scheme_) {
// Didn't match scheme expectation.
return SchemeHostPortMatcherResult::kNoMatch;
}
// Note it is necessary to lower-case the host, since GURL uses capital
// letters for percent-escaped characters.
return base::MatchPattern(url.host(), hostname_pattern_)
? SchemeHostPortMatcherResult::kInclude
: SchemeHostPortMatcherResult::kNoMatch;
}
std::string SchemeHostPortMatcherHostnamePatternRule::ToString() const {
std::string str;
if (!optional_scheme_.empty())
base::StringAppendF(&str, "%s://", optional_scheme_.c_str());
str += hostname_pattern_;
if (optional_port_ != -1)
base::StringAppendF(&str, ":%d", optional_port_);
return str;
}
bool SchemeHostPortMatcherHostnamePatternRule::IsHostnamePatternRule() const {
return true;
}
std::unique_ptr<SchemeHostPortMatcherHostnamePatternRule>
SchemeHostPortMatcherHostnamePatternRule::GenerateSuffixMatchingRule() const {
if (!base::StartsWith(hostname_pattern_, "*", base::CompareCase::SENSITIVE)) {
return std::make_unique<SchemeHostPortMatcherHostnamePatternRule>(
optional_scheme_, "*" + hostname_pattern_, optional_port_);
}
// return a new SchemeHostPortMatcherHostNamePatternRule with the same data.
return std::make_unique<SchemeHostPortMatcherHostnamePatternRule>(
optional_scheme_, hostname_pattern_, optional_port_);
}
SchemeHostPortMatcherIPHostRule::SchemeHostPortMatcherIPHostRule(
const std::string& optional_scheme,
const IPEndPoint& ip_end_point)
: optional_scheme_(base::ToLowerASCII(optional_scheme)),
ip_host_(AddBracketsIfIPv6(ip_end_point.address())),
optional_port_(ip_end_point.port()) {}
SchemeHostPortMatcherResult SchemeHostPortMatcherIPHostRule::Evaluate(
const GURL& url) const {
if (optional_port_ != 0 && url.EffectiveIntPort() != optional_port_) {
// Didn't match port expectation.
return SchemeHostPortMatcherResult::kNoMatch;
}
if (!optional_scheme_.empty() && url.scheme() != optional_scheme_) {
// Didn't match scheme expectation.
return SchemeHostPortMatcherResult::kNoMatch;
}
// Note it is necessary to lower-case the host, since GURL uses capital
// letters for percent-escaped characters.
return base::MatchPattern(url.host(), ip_host_)
? SchemeHostPortMatcherResult::kInclude
: SchemeHostPortMatcherResult::kNoMatch;
}
std::string SchemeHostPortMatcherIPHostRule::ToString() const {
std::string str;
if (!optional_scheme_.empty())
base::StringAppendF(&str, "%s://", optional_scheme_.c_str());
str += ip_host_;
if (optional_port_ != 0)
base::StringAppendF(&str, ":%d", optional_port_);
return str;
}
SchemeHostPortMatcherIPBlockRule::SchemeHostPortMatcherIPBlockRule(
const std::string& description,
const std::string& optional_scheme,
const IPAddress& ip_prefix,
size_t prefix_length_in_bits)
: description_(description),
optional_scheme_(optional_scheme),
ip_prefix_(ip_prefix),
prefix_length_in_bits_(prefix_length_in_bits) {}
SchemeHostPortMatcherResult SchemeHostPortMatcherIPBlockRule::Evaluate(
const GURL& url) const {
if (!url.HostIsIPAddress())
return SchemeHostPortMatcherResult::kNoMatch;
if (!optional_scheme_.empty() && url.scheme() != optional_scheme_) {
// Didn't match scheme expectation.
return SchemeHostPortMatcherResult::kNoMatch;
}
// Parse the input IP literal to a number.
IPAddress ip_address;
if (!ip_address.AssignFromIPLiteral(url.HostNoBracketsPiece()))
return SchemeHostPortMatcherResult::kNoMatch;
// Test if it has the expected prefix.
return IPAddressMatchesPrefix(ip_address, ip_prefix_, prefix_length_in_bits_)
? SchemeHostPortMatcherResult::kInclude
: SchemeHostPortMatcherResult::kNoMatch;
}
std::string SchemeHostPortMatcherIPBlockRule::ToString() const {
return description_;
}
} // namespace net
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