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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/common/permissions/socket_permission_entry.h"
#include <stdint.h>
#include <cstdlib>
#include <memory>
#include <sstream>
#include <string_view>
#include <vector>
#include "base/check.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "extensions/common/permissions/api_permission.h"
#include "extensions/common/permissions/socket_permission.h"
#include "url/url_canon.h"
namespace {
using content::SocketPermissionRequest;
const char kColon = ':';
const char kDot = '.';
const char kWildcard[] = "*";
const uint16_t kWildcardPortNumber = 0;
const uint16_t kInvalidPort = 65535;
bool StartsOrEndsWithWhitespace(const std::string& str) {
return !str.empty() && (base::IsAsciiWhitespace(str.front()) ||
base::IsAsciiWhitespace(str.back()));
}
} // namespace
namespace extensions {
SocketPermissionEntry::SocketPermissionEntry()
: pattern_(SocketPermissionRequest::NONE, std::string(), kInvalidPort),
match_subdomains_(false) {}
SocketPermissionEntry::~SocketPermissionEntry() = default;
bool SocketPermissionEntry::Check(
const content::SocketPermissionRequest& request) const {
if (pattern_.type != request.type)
return false;
std::string lhost = base::ToLowerASCII(request.host);
if (pattern_.host != lhost) {
if (!match_subdomains_)
return false;
if (!pattern_.host.empty()) {
// Do not wildcard part of IP address.
url::Component component(0, lhost.length());
url::RawCanonOutputT<char, 128> ignored_output;
url::CanonHostInfo host_info;
url::CanonicalizeIPAddress(
lhost.c_str(), component, &ignored_output, &host_info);
if (host_info.IsIPAddress())
return false;
// host should equal one or more chars + "." + host_.
int i = lhost.length() - pattern_.host.length();
if (i < 2)
return false;
if (lhost.compare(i, pattern_.host.length(), pattern_.host) != 0)
return false;
if (lhost[i - 1] != kDot)
return false;
}
}
if (pattern_.port != request.port && pattern_.port != kWildcardPortNumber)
return false;
return true;
}
SocketPermissionEntry::HostType SocketPermissionEntry::GetHostType() const {
return pattern_.host.empty()
? SocketPermissionEntry::ANY_HOST
: match_subdomains_ ? SocketPermissionEntry::HOSTS_IN_DOMAINS
: SocketPermissionEntry::SPECIFIC_HOSTS;
}
bool SocketPermissionEntry::IsAddressBoundType() const {
return pattern_.type == SocketPermissionRequest::TCP_CONNECT ||
pattern_.type == SocketPermissionRequest::TCP_LISTEN ||
pattern_.type == SocketPermissionRequest::UDP_BIND ||
pattern_.type == SocketPermissionRequest::UDP_SEND_TO;
}
// static
bool SocketPermissionEntry::ParseHostPattern(
SocketPermissionRequest::OperationType type,
const std::string& pattern,
SocketPermissionEntry* entry) {
std::vector<std::string> tokens =
base::SplitString(pattern, std::string(1, kColon), base::KEEP_WHITESPACE,
base::SPLIT_WANT_ALL);
return ParseHostPattern(type, tokens, entry);
}
// static
bool SocketPermissionEntry::ParseHostPattern(
SocketPermissionRequest::OperationType type,
const std::vector<std::string>& pattern_tokens,
SocketPermissionEntry* entry) {
SocketPermissionEntry result;
if (type == SocketPermissionRequest::NONE)
return false;
if (pattern_tokens.size() > 2)
return false;
result.pattern_.type = type;
result.pattern_.port = kWildcardPortNumber;
result.match_subdomains_ = true;
if (pattern_tokens.size() == 0) {
*entry = result;
return true;
}
// Return an error if address is specified for permissions that don't
// need it (such as 'resolve-host').
if (!result.IsAddressBoundType())
return false;
result.pattern_.host = pattern_tokens[0];
if (!result.pattern_.host.empty()) {
if (StartsOrEndsWithWhitespace(result.pattern_.host))
return false;
result.pattern_.host = base::ToLowerASCII(result.pattern_.host);
// The first component can optionally be '*' to match all subdomains.
std::vector<std::string_view> host_components =
base::SplitStringPiece(result.pattern_.host, std::string{kDot},
base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
DCHECK(!host_components.empty());
if (host_components[0] == kWildcard || host_components[0].empty()) {
host_components.erase(host_components.begin(),
host_components.begin() + 1);
} else {
result.match_subdomains_ = false;
}
result.pattern_.host = base::JoinString(host_components, ".");
}
if (pattern_tokens.size() == 1 || pattern_tokens[1].empty() ||
pattern_tokens[1] == kWildcard) {
*entry = result;
return true;
}
if (StartsOrEndsWithWhitespace(pattern_tokens[1]))
return false;
int port;
if (!base::StringToInt(pattern_tokens[1], &port) || port < 1 || port > 65535)
return false;
result.pattern_.port = static_cast<uint16_t>(port);
*entry = result;
return true;
}
std::string SocketPermissionEntry::GetHostPatternAsString() const {
std::string result;
if (!IsAddressBoundType())
return result;
if (match_subdomains()) {
result.append(kWildcard);
if (!pattern_.host.empty())
result.append(1, kDot).append(pattern_.host);
} else {
result.append(pattern_.host);
}
if (pattern_.port == kWildcardPortNumber)
result.append(1, kColon).append(kWildcard);
else
result.append(1, kColon).append(base::NumberToString(pattern_.port));
return result;
}
} // namespace extensions
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