| // Copyright 2013 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 "extensions/common/manifest_handlers/csp_info.h" |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "base/strings/string_util.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "base/values.h" |
| #include "extensions/common/csp_validator.h" |
| #include "extensions/common/manifest_constants.h" |
| #include "extensions/common/manifest_handlers/sandboxed_page_info.h" |
| |
| namespace extensions { |
| |
| namespace keys = manifest_keys; |
| namespace errors = manifest_errors; |
| |
| using csp_validator::ContentSecurityPolicyIsLegal; |
| using csp_validator::ContentSecurityPolicyIsSecure; |
| |
| namespace { |
| |
| const char kDefaultContentSecurityPolicy[] = |
| "script-src 'self' chrome-extension-resource:; object-src 'self'"; |
| |
| #define PLATFORM_APP_LOCAL_CSP_SOURCES \ |
| "'self' data: chrome-extension-resource:" |
| const char kDefaultPlatformAppContentSecurityPolicy[] = |
| // Platform apps can only use local resources by default. |
| "default-src 'self' chrome-extension-resource:;" |
| // For remote resources, they can fetch them via XMLHttpRequest. |
| "connect-src *;" |
| // And serve them via data: or same-origin (blob:, filesystem:) URLs |
| "style-src " PLATFORM_APP_LOCAL_CSP_SOURCES " 'unsafe-inline';" |
| "img-src " PLATFORM_APP_LOCAL_CSP_SOURCES ";" |
| "frame-src " PLATFORM_APP_LOCAL_CSP_SOURCES ";" |
| "font-src " PLATFORM_APP_LOCAL_CSP_SOURCES ";" |
| // Media can be loaded from remote resources since: |
| // 1. <video> and <audio> have good fallback behavior when offline or under |
| // spotty connectivity. |
| // 2. Fetching via XHR and serving via blob: URLs currently does not allow |
| // streaming or partial buffering. |
| "media-src *;"; |
| |
| } // namespace |
| |
| CSPInfo::CSPInfo(const std::string& security_policy) |
| : content_security_policy(security_policy) { |
| } |
| |
| CSPInfo::~CSPInfo() { |
| } |
| |
| // static |
| const std::string& CSPInfo::GetContentSecurityPolicy( |
| const Extension* extension) { |
| CSPInfo* csp_info = static_cast<CSPInfo*>( |
| extension->GetManifestData(keys::kContentSecurityPolicy)); |
| return csp_info ? csp_info->content_security_policy : base::EmptyString(); |
| } |
| |
| // static |
| const std::string& CSPInfo::GetResourceContentSecurityPolicy( |
| const Extension* extension, |
| const std::string& relative_path) { |
| return SandboxedPageInfo::IsSandboxedPage(extension, relative_path) ? |
| SandboxedPageInfo::GetContentSecurityPolicy(extension) : |
| GetContentSecurityPolicy(extension); |
| } |
| |
| CSPHandler::CSPHandler(bool is_platform_app) |
| : is_platform_app_(is_platform_app) { |
| } |
| |
| CSPHandler::~CSPHandler() { |
| } |
| |
| bool CSPHandler::Parse(Extension* extension, base::string16* error) { |
| const std::string key = Keys()[0]; |
| if (!extension->manifest()->HasPath(key)) { |
| if (extension->manifest_version() >= 2) { |
| // TODO(abarth): Should we continue to let extensions override the |
| // default Content-Security-Policy? |
| std::string content_security_policy = is_platform_app_ ? |
| kDefaultPlatformAppContentSecurityPolicy : |
| kDefaultContentSecurityPolicy; |
| |
| CHECK(ContentSecurityPolicyIsSecure(content_security_policy, |
| extension->GetType())); |
| extension->SetManifestData(keys::kContentSecurityPolicy, |
| new CSPInfo(content_security_policy)); |
| } |
| return true; |
| } |
| |
| std::string content_security_policy; |
| if (!extension->manifest()->GetString(key, &content_security_policy)) { |
| *error = base::ASCIIToUTF16(errors::kInvalidContentSecurityPolicy); |
| return false; |
| } |
| if (!ContentSecurityPolicyIsLegal(content_security_policy)) { |
| *error = base::ASCIIToUTF16(errors::kInvalidContentSecurityPolicy); |
| return false; |
| } |
| if (extension->manifest_version() >= 2 && |
| !ContentSecurityPolicyIsSecure(content_security_policy, |
| extension->GetType())) { |
| *error = base::ASCIIToUTF16(errors::kInsecureContentSecurityPolicy); |
| return false; |
| } |
| |
| extension->SetManifestData(keys::kContentSecurityPolicy, |
| new CSPInfo(content_security_policy)); |
| return true; |
| } |
| |
| bool CSPHandler::AlwaysParseForType(Manifest::Type type) const { |
| if (is_platform_app_) |
| return type == Manifest::TYPE_PLATFORM_APP; |
| else |
| return type == Manifest::TYPE_EXTENSION || |
| type == Manifest::TYPE_LEGACY_PACKAGED_APP; |
| } |
| |
| const std::vector<std::string> CSPHandler::Keys() const { |
| const std::string& key = is_platform_app_ ? |
| keys::kPlatformAppContentSecurityPolicy : keys::kContentSecurityPolicy; |
| return SingleKey(key); |
| } |
| |
| } // namespace extensions |