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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_CSP_CONTENT_SECURITY_POLICY_H_
#define COBALT_CSP_CONTENT_SECURITY_POLICY_H_
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/hash_tables.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "cobalt/csp/parsers.h"
#include "googleurl/src/gurl.h"
#include "net/http/http_response_headers.h"
namespace cobalt {
namespace csp {
class DirectiveList;
class Source;
// Wrap up information about a CSP violation, for passing to the Delegate.
struct ViolationInfo {
std::string directive_text;
std::string effective_directive;
std::string console_message;
GURL blocked_url;
std::vector<std::string> endpoints;
std::string header;
};
// A callback that a URL fetcher will call to check if the URL is permitted
// by our security policy. This may be called multiple times if the URL results
// in a redirect. The callback should return |true| if the URL is safe to
// load.
typedef base::Callback<bool(const GURL& url, bool did_redirect)>
SecurityCallback;
typedef base::Callback<void(const ViolationInfo&)> ViolationCallback;
// Extract CSP-related headers from HttpResponseHeaders.
class ResponseHeaders {
public:
ResponseHeaders() {}
explicit ResponseHeaders(
const scoped_refptr<net::HttpResponseHeaders>& response);
const std::string& content_security_policy() const {
return content_security_policy_;
}
const std::string& content_security_policy_report_only() const {
return content_security_policy_report_only_;
}
private:
std::string content_security_policy_;
std::string content_security_policy_report_only_;
};
class ContentSecurityPolicy {
public:
typedef ScopedVector<DirectiveList> PolicyList;
// CSP Level 1 Directives
static const char kConnectSrc[];
static const char kDefaultSrc[];
static const char kFontSrc[];
static const char kFrameSrc[];
static const char kImgSrc[];
static const char kMediaSrc[];
static const char kObjectSrc[];
static const char kReportURI[];
static const char kSandbox[];
static const char kScriptSrc[];
static const char kStyleSrc[];
// CSP Level 2 Directives
static const char kBaseURI[];
static const char kChildSrc[];
static const char kFormAction[];
static const char kFrameAncestors[];
static const char kPluginTypes[];
static const char kReflectedXSS[];
static const char kReferrer[];
// Custom CSP directive for Cobalt
static const char kLocationSrc[];
// Manifest Directives (to be merged into CSP Level 2)
// https://w3c.github.io/manifest/#content-security-policy
static const char kManifestSrc[];
// Mixed Content Directive
// https://w3c.github.io/webappsec/specs/mixedcontent/#strict-mode
static const char kBlockAllMixedContent[];
// https://w3c.github.io/webappsec/specs/upgrade/
static const char kUpgradeInsecureRequests[];
// Suborigin Directive
// https://metromoxie.github.io/webappsec/specs/suborigins/index.html
static const char kSuborigin[];
enum ReportingStatus {
kSendReport,
kSuppressReport,
};
// When a resource is loaded after a redirect, source paths are
// ignored in the matching algorithm.
enum RedirectStatus {
kDidRedirect,
kDidNotRedirect,
};
static bool IsDirectiveName(const std::string& name);
ContentSecurityPolicy(const GURL& url,
const ViolationCallback& violation_callback);
~ContentSecurityPolicy();
void OnReceiveHeaders(const ResponseHeaders& headers);
void OnReceiveHeader(const std::string& header, HeaderType header_type,
HeaderSource header_source);
void SetNavigationPolicy(const std::string& header);
bool UrlMatchesSelf(const GURL& url) const;
bool SchemeMatchesSelf(const GURL& url) const;
void ReportViolation(const std::string& directive_text,
const std::string& effective_directive,
const std::string& console_message,
const GURL& blocked_url,
const std::vector<std::string>& report_endpoints,
const std::string& header);
// Diagnostic functions for reporting errors in the CSP directives.
void ReportInvalidReferrer(const std::string& invalid_value);
void ReportInvalidPluginTypes(const std::string& invalid_plugin);
void ReportMetaOutsideHead(const std::string& header);
void ReportValueForEmptyDirective(const std::string& directive_name,
const std::string& value);
void ReportDirectiveAsSourceExpression(const std::string& directive_name,
const std::string& source_expression);
void ReportInvalidSourceExpression(const std::string& directive_name,
const std::string& source);
void ReportInvalidPathCharacter(const std::string& directive_name,
const std::string& value, char c);
void ReportDuplicateDirective(const std::string& name);
void ReportInvalidDirectiveValueCharacter(const std::string& directive_name,
const std::string& value);
void ReportInvalidReflectedXSS(const std::string& invalid_value);
void ReportMissingReportURI(const std::string& policy);
void ReportReportOnlyInMeta(const std::string& header);
void ReportInvalidSuboriginFlags(const std::string& invalid_flags);
void ReportUnsupportedDirective(const std::string& name);
void ReportInvalidInReportOnly(const std::string& name);
void ReportDirectiveNotSupportedInsideMeta(const std::string& name);
// https://www.w3.org/TR/2015/CR-CSP2-20150721/#directives
bool AllowJavaScriptURLs(const std::string& context_url, int context_line,
ReportingStatus status = kSendReport) const;
bool AllowInlineEventHandlers(const std::string& context_url,
int context_line,
ReportingStatus status = kSendReport) const;
bool AllowInlineScript(const std::string& context_url, int context_line,
const std::string& script_content,
ReportingStatus status = kSendReport) const;
bool AllowInlineStyle(const std::string& context_url, int context_line,
const std::string& style_content,
ReportingStatus status = kSendReport) const;
bool AllowEval(ReportingStatus status = kSendReport) const;
bool AllowScriptFromSource(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowObjectFromSource(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowImageFromSource(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowStyleFromSource(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowFontFromSource(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowMediaFromSource(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowConnectToSource(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowNavigateToSource(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowFormAction(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowBaseURI(const GURL& url, RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
bool AllowManifestFromSource(const GURL& url,
RedirectStatus redirect = kDidNotRedirect,
ReportingStatus report = kSendReport) const;
// The nonce and hash allow functions are guaranteed to not have any side
// effects, including reporting.
// Nonce/Hash functions check all policies relating to use of a script/style
// with the given nonce/hash and return true all CSP policies allow it.
// If these return true, callers can then process the content or
// issue a load and be safe disabling any further CSP checks.
bool AllowScriptWithNonce(const std::string& nonce) const;
bool AllowStyleWithNonce(const std::string& nonce) const;
bool AllowScriptWithHash(const std::string& source) const;
bool AllowStyleWithHash(const std::string& source) const;
void set_uses_script_hash_algorithms(uint8 algorithm) {
script_hash_algorithms_used_ |= algorithm;
}
void set_uses_style_hash_algorithms(uint8 algorithm) {
style_hash_algorithms_used_ |= algorithm;
}
// Configure the origin URL for the document that owns this policy.
// This could change during loading if the document load is redirected.
void NotifyUrlChanged(const GURL& url);
bool DidSetReferrerPolicy() const;
const GURL& url() const { return url_; }
void set_enforce_strict_mixed_content_checking() {
enforce_strict_mixed_content_checking_ = true;
}
const std::string& disable_eval_error_message() const {
return disable_eval_error_message_;
}
private:
void CreateSelfSource();
// Parses CSP header and creates policy based on that.
void AddPolicyFromHeaderValue(const std::string& header, HeaderType type,
HeaderSource source);
PolicyList policies_;
scoped_ptr<DirectiveList> navigation_policy_;
scoped_ptr<Source> self_source_;
std::string self_scheme_;
std::string disable_eval_error_message_;
GURL url_;
// Callback to use for reporting CSP violations.
ViolationCallback violation_callback_;
// Fields needing initialization.
// Bitmasks of HashAlgorithm
uint8 script_hash_algorithms_used_;
uint8 style_hash_algorithms_used_;
bool enforce_strict_mixed_content_checking_;
ReferrerPolicy referrer_policy_;
DISALLOW_COPY_AND_ASSIGN(ContentSecurityPolicy);
};
} // namespace csp
} // namespace cobalt
#endif // COBALT_CSP_CONTENT_SECURITY_POLICY_H_